Daily maintenance method of acid and alkali resistant centrifugal pump

1. The inlet and outlet pressure, flow and motor current of the centrifugal pump shall be kept in the normal use standard, and it is prohibited to pump for a long time. The flow and head of the acid and alkali resistant centrifugal pump shall be controlled within the range indicated on the signboard as far as possible to ensure that the acid and alkali resistant centrifugal pump operates at the design point, so as to achieve the effect of energy saving and consumption reduction.
2. During the operation of acid and alkali resistant centrifugal pump, the bearing temperature shall not exceed the working temperature by 50 ℃, and the upper limit shall not exceed 90 ℃.
3. Check the sealing condition of centrifugal pump frequently, and report to the workshop for maintenance in case of leakage.
4. Always check the quality of lubricating oil and oil level indicator in the oil tank, and replace them immediately if they are found to be deteriorated to avoid false liquid level.
5. The filter press pump shall be sealed with cooling circulating water. The cooling circulating water shall be kept smooth. The cooling circulating water shall not be interrupted within one week after the new seal ring is replaced.
6. Check whether the pump base and motor are firm. If they are loose, the centrifugal pump will vibrate. Stop the pump immediately to check the root cause when the pump makes an abnormal noise.

7. The centrifugal pump shall be operated for 300 hours within 3 months to replace the lubricating oil, and the lubricating oil shall be replaced within 3-6 months for the second time. After 6~12 months, it shall be lubricated and replaced.
8. Check the condition of instruments and leads to see if the pipes are leaking or loose, or damaged in other forms. If maintenance is needed, it should be carried out immediately.
9. Whether the mechanical seal is always leaking. If there is a leak, the compression degree of the moving ring should be adjusted in time to ensure that the sealing surface does not leak. Do not press too tightly to reduce the service life of the sealing property. Note: The filter press pump is the most demanding working condition in the process flow, and also the position with the largest consumption of spare parts. When the sealing leakage is not serious, the seal will not be replaced. Generally, the closed circulation reuse system of the leaking liquid should be considered in the design, but it is subject to the scarcity of materials.
10. When the acid and alkali resistant centrifugal pump is used in cold winter, the liquid in the pump body and pipeline shall be completely discharged when it is stopped. Avoid freezing.
11. If the acid and alkali resistant centrifugal pump is not used for a long time, it is necessary to disassemble all the pumps, wipe off the water, coat the rotating parts and joints with grease, and install them properly for maintenance.
12. For pumps that are not used, turn the gear once before each shift to ensure that the pumps are in good use.
13. When the acid and alkali resistant centrifugal pump is to be stopped, first turn off the valve and pressure gauge, and then disconnect the motor power supply.

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Components of centrifugal pump

Centrifugal pumps are composed of many parts. They can be roughly divided into three categories according to the working state of each part during operation
Type: rotating part, fixed part J4: and connecting part. Take the single-stage single suction horizontal diaphragm pump as an example, as shown in Figure 2.4
The function, composition, structure and material of each part under.
2.2.1 Rotating parts
1 Impeller (also called working wheel)
The barking wheel is the main part of the water pump, or even the core part of the water pump. The centrifugal system depends on the high-speed rotation of the impeller
Transferring water for energy calibration.
The wheel rubber of the gear pump is composed of two circular covers. If there is a curved blade between the covers
The two cover plates are connected together, and the space groove enclosed by the two adjacent blades and the front and rear cover plates is generally referred to as the flow of water.

The shape and size of the impeller are determined by test and calculation, which can be generally divided into leather suction impeller and double suction impeller.
The front cover plate of the impeller with a round hole for water inlet is called a single suction impeller, and the front and rear cover plates of the impeller with a round 7L water inlet are called double suction impeller
Suction impeller.
It is a teaching suction impeller. It is equipped with a single-sided chock wheel cover plate for water intake, while the rear cover plate is H without the cover plate of the wheel intake; Symmetrical shape. It is a double suction impeller. The front and rear cover plates of the impeller are equipped with round water inlets
The cover plate is symmetrical and generally used for large flow centrifugal pumps.
In addition to sufficient mechanical strength, wear resistance and corrosion resistance of materials shall also be considered
Performance. Recently, most impellers of screw pumps are made of cast iron, cast steel and bronze, and hard plastic and alloy steel are also used.

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How to prevent the motor of centrifugal pump from being burnt?

 Dadonghai Pump Wuxi Co., Ltd. is a professional centrifugal pump manufacturer. When selecting centrifugal pumps for customers, our pump manufacturers will provide perfect pre-sales services such as centrifugal pump models, centrifugal pump prices, etc. for customers’ reference, and our pump manufacturers can provide customers with customized pump products. This information is about how to prevent the motor of centrifugal pump from being burnt:

The motor may fail during operation, and burning is one of them, which not only affects the normal work, but also increases the cost, causing us a lot of trouble. There are many reasons why the motor is burnt out, which is related to the quality of the machine itself and whether the centrifugal pump is used correctly.
After the power is turned on, carefully observe the working condition of the centrifugal pump. The outlet water should be connected evenly and the centrifugal pump can be used without vibration and noise. In case of sudden shutdown during operation, disconnect the power supply immediately and check the cause. The interval between two starts of the centrifugal pump shall be limited to the return of all water in the centrifugal pump. If it starts too early, the motor will be burnt due to excessive resistance and water hammer in the water pipe. In addition, if the centrifugal pump is installed in the well, it should be noted that the flow of the centrifugal pump should be consistent with the normal water yield of the well, otherwise it will form an empty machine and burn the motor.
In order to ensure the normal operation of centrifugal pumps, Dadonghai Pump Industry reminds everyone to pay attention to the following points before using centrifugal pumps:
1. Check whether the centrifugal pump motor winding is open circuit. The insulation condition can be measured with a 500V megohmmeter. When the insulation resistance is lower than 0.5 megohm, the centrifugal pump cannot be used.
2. Remove the filter screen and check whether the rolling pump shaft is sensitive. If not, adjust it before use.
3. Whether the selection of gate fuse capacity is appropriate, and other wires cannot be used to replace the fuse.
4. Turn on the power and check whether the impeller works normally (the power on time shall not exceed 3–5 seconds, otherwise the motor may be burnt out.

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In depth analysis, can the magnetic pump run idle?

With the aggravation of the environmental protection situation, more and more chemical enterprises are required to use magnetic pumps to transport various corrosive materials. As we all know, magnetic pumps cannot idle. As long as they idle for a few minutes, the friction between the shaft and the shaft sleeve inside them will produce extremely high temperature, quickly wear the graphite bearings and shafts, and even burn the inner rotor.
In recent years, domestic magnetic pump manufacturers claim to be able to do anti idling magnetic pumps. Is it true? Does idling magnetic pump really work? Can it really idle for a long time?
Today, I would like to introduce some details to you. I hope it will be helpful to users.
At present, there are two kinds of idling magnetic pumps produced by some domestic manufacturers. One is that ceramic rolling bearings are used to replace the original sliding bearings. When the magnetic pump is short of liquid, the friction coefficient of the rolling bearings is low and the heat generated is relatively small. Therefore, the magnetic pump can be idling without burning the bearings and rotors. The disadvantages of this structure are: it cannot carry high torque, materials with higher density cannot be transported normally, and ceramic bearing balls are fragile.
The other is the LHC idling fluorine lined magnetic pump developed by Green Ring. This magnetic pump is a complete upgrade of the main shaft and shaft sleeve on the original traditional basis. It is filled with nano carbon powder technology to achieve the function of idling and self-lubricating. Relatively speaking, the latter is more in line with idling requirements in terms of technology and practical theory.

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The Harm of Centrifugal Pump Cavitation

 

The cavitation phenomenon of centrifugal pump is one of the common faults of centrifugal pump. Once cavitation occurs in the pump, its flow and head performance will not only decline, but also show obvious high noise and vibration. In serious cases, it will even interrupt the liquid flow in the pump and cannot work normally. Cavitation will also damage the flow passage components of the pump, and even affect the pipeline system. There are many reasons for cavitation, such as quality problems of centrifugal pump products, improper use of operators, etc. Before leaving the factory, the products will pass the quality inspection of multiple procedures, so the influence of human factors is greater. In the working state, the working environment and operating factors of centrifugal pumps account for the vast majority of the cavitation phenomenon of centrifugal pumps.
Cavitation will affect the normal operation of centrifugal pumps, causing many serious consequences.
The performance of centrifugal pump is reduced due to cavitation
Centrifugal pump transfers energy to the medium through the rotation of the impeller and converts it into the pressure energy of the medium. However, cavitation will seriously interfere with the energy transfer between the impeller and the liquid. When cavitation occurs, a large number of bubbles will be generated in the medium, which will block the impeller flow passage, and vortex will be generated locally, increasing the flow loss, reducing the pump flow, head and efficiency. In serious cases, it will also lead to flow interruption, making the centrifugal pump unable to work normally.
Cavitation will damage the overcurrent components
Among the flow passage components of centrifugal pump, the impeller is the part most affected by cavitation. When cavitation occurs, many small pits will gradually appear on the surface of metal materials, and then the pits will continue to develop and expand into honeycomb and groove shapes. In serious cases, perforation will occur, and even the impeller will break, seriously affecting the service life of the pump.
Noise and vibration of pump caused by cavitation
When cavitation occurs, high-frequency liquid collisions will produce various noises. In serious cases, the pump will emit crackling explosions, and at the same time, it will induce the vibration of the pump unit, which in turn will accelerate the generation and rupture of bubbles. When the frequency of liquid hammer is the same as the natural frequency of the pump unit, strong cavitation resonance will occur, which will rapidly increase the amplitude. At this time, if you want to protect the centrifugal pump from greater damage, you must immediately stop for inspection.

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Five Advantages of Pipeline Pump

 

The pipeline centrifugal pump is a novel pump developed for pipeline pressurization and transportation to solve the problem of low pipeline pressure. It has great advantages over the horizontal centrifugal pump currently used. The advantages of pipeline pump are mainly reflected in the following points:
1. Pipeline pump is applicable to pressurized water delivery for high-rise buildings, garden sprinkler irrigation, cooling tower water supply, long-distance water delivery, air conditioning, refrigeration washing, bathroom and other cooling systems; Warm water is pressurized circularly, and the operating temperature is below 80 ℃.
2. It is applicable to high-temperature hot water pressurization cycle in heating, boiler and other industries. The operating temperature is below 150 ℃.
3. It is applicable to the transportation of corrosive media in the process flow of food, pharmaceutical, liquor making, chemical and other industries, with the operating temperature below 80 ℃.
4. It is applicable to other industrial sites where there are non corrosive liquids, methane or underground fixed equipment of coal mine Class I, factory Class IIA and IIB, temperature groups T1, T2, T3, T4, and explosive mixtures. The operating temperature is below 80 ℃.
5. The pipeline pump is suitable for conveying corrosive industrial liquids such as chemical, pharmaceutical, petroleum, food, national defense, etc. There are other industrial sites with explosive mixtures in groups T1, T2, T3, T4, such as methane or coal mine underground fixed equipment Class I, factory IIA, IIB. The operating temperature is below 150 ℃.

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Centrifugal pump test method and precautions

All newly purchased and installed centrifugal pump products need to be tested in advance after installation. The following centrifugal pump testing methods and precautions should be followed when testing centrifugal pumps
1. Before starting the centrifugal pump, it is forbidden to run the pump with no load and no load. The liquid test shall be carried out according to the operating procedures specified in the operating instructions of the centrifugal pump. For the forced lubrication system, the temperature rise of the bearing oil of the centrifugal pump shall not exceed 28 ℃, and the temperature of the bearing metal shall be less than 93 ℃.
2. For centrifugal pump of oil ring lubrication or splash lubrication system, the temperature of lubricating oil shall not exceed 39 ℃, and the temperature of bearing parts shall be less than 82 ℃.
3. When testing the centrifugal pump, the vibration value of the bearing of the centrifugal pump should also be checked. The vibration standard of the bearing of the centrifugal pump can refer to the vibration standard of the relevant petrochemical rotating machinery.
4. During the test run of centrifugal pump, the operation of centrifugal pump shall be very balanced and noiseless, the coolant and lubricating oil system shall be normal, and the centrifugal pump and auxiliary pipeline shall be free of leakage.
5. During the test run of the centrifugal pump, attention should be paid to whether the current of the motor of the centrifugal pump operates within the specified range. If the current exceeds the specified range, it means that the head under the actual working condition is lower than the pump head. At this time, it is recommended to turn down the outlet valve to control the flow of the centrifugal pump so that its current can be used within the rated current range.
6. Various seals and medium leakage of centrifugal pump shall not exceed the following standard requirements:
(1) Clean water centrifugal pump with mechanical seal: light oil 10 drops/min, heavy oil 5 drops/min
(2) Multi stage centrifugal pump products with packing seal: light oil 20 drops/min, heavy oil 10 drops/min
(3) For the magnetic drive pump to transport toxic, harmful, flammable and explosive media, no visible leakage is allowed.

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What should be paid attention to during maintenance of multistage centrifugal pump

 

If conditions permit, it is better to read the manufacturer's maintenance instructions and general assembly drawings first to see what special points need attention.
1、 During disassembly:
1. Before removing the thrust bearing, measure the clearance of the balance disc with a dial indicator and make records;
2. When disassembling the multistage pump, all parts must be marked according to the original assembly sequence to avoid confusion and wrong installation during reassembly;
3. Small parts (such as keys) that are not convenient for marking can be put together with impellers or guide vanes (middle section) at the same level.
4. During disassembly, you can visually feel whether there are abnormal parts, such as loose fit.
2、 Parts maintenance:
1. Visually check whether the surface of each part is normal, and all mating surfaces must be free of bumps, scratches, rust, etc;
2. Use measuring tools to measure whether the tolerance of key mating parts is qualified;
3. Measure whether the clearance of impeller seal ring, housing seal ring, guide vane seal ring, interstage shaft sleeve, etc. is within the tolerance range, and replace them if they are excessively worn;
4. Check whether the bearing is in good condition;
5. All sealing rings and gaskets shall be replaced if they are superior;
3、 Reinstallation:
1. First install the rotor and conduct dynamic balance test again;
2. Reassemble all parts in the reverse order of pump disassembly. During reassembly, pay attention to the clearance value of each seal ring again to ensure that it is correct;
3. Before installing the balance disc, measure the total rotor runout;
4. After installing the balance disc, measure the rotor half run.
5. Compared with the total string quantity and half string quantity required on the general assembly drawing of the manufacturer, they should basically meet the drawing requirements. Generally, the half string quantity is about half of the total string quantity.
6. Tighten all the main bolts evenly and diagonally;
7. Draw a dial indicator on the shaft, and rotate the shaft to mark the balance disc. The tolerance shall be in accordance with the drawing requirements and generally shall not exceed 0.06;
8. When installing the thrust bearing, pay attention to adjusting the clearance of the balance disc, and use the adjusting ring in front of the bearing to adjust the clearance of the balance disc to the drawing requirements.

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Introduction to mixed flow pump

1、 Type of mud flow pump
Mixed flow pump is a kind of pump between centrifugal pump and axial flow pump. Its lift is suitable
Medium. With large flow and wide application scope, it is a good pump type in plain river network areas and hilly areas.
According to the difference of outlet chamber of gear pump, diaphragm pump has volute type and guide vane type.
The volute type mixed flow pump can be divided into horizontal type and vertical type, among which the horizontal type is more widely used; Guide vane mixing
There are also two types of sulfur pumps: horizontal and vertical. The vertical mixed flow pump is similar to the vertical axial flow pump
Medium and small mixed flow pumps, most of which are of chip expansion volute type, and large mixed flow pumps are of guide vane type.
Like axial flow pump, the pr plate of mixed flow pump is generally fixed, but large guide vane mixed flow pump
The blade pairs of are made into fully adjustable ones. According to the needs of operation, the blade can be adjusted at any time
Installation angle to expand its high efficiency operation range.
2、 Structure of mixed flow pump
Compared with centrifugal pump and axial flow pump, mixed flow pump has low lift and large flow, so the impeller
The shape is quite special. Since the difference between the inlet diameter and the outlet diameter of the impeller is small, the flow passage
The ratio of width to outlet diameter is relatively large, so the relative width of volute is greater than that of centrifugal pump
Large. The blade is in a throw curve form from the inlet to the outlet, and the edge of the blade outlet is inclined, resulting in
Centrifugal force and thrust, the direction of water flowing out of the impeller is neither radial (such as centrifugal force
Pump) is not axial (such as uranium flow pump), but is inclined between them, so mixed flow pump
Also called diagonal flow pump. The shape of the mixed flow system impeller is shown in Figure 5. Low specific speed impeller
It is closed, with front and rear cover plates, similar to the impeller of centrifugal pump; High specific speed. L round is open
Type, similar to axial flow pump.

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Classification of main sealing forms of chemical pumps

 

Chemical pumps are widely used in chemical, petroleum, metallurgy, light industry, synthetic fiber, environmental protection, food, medicine and other sectors. Compared with other types of pumps, chemical pumps have the advantages of stable and reliable performance, good sealing performance, beautiful appearance, convenient use and maintenance, etc. It plays a great role in improving product quality, reducing leakage, emission, dripping and leakage, preventing pollution and improving the environment. What are the main sealing forms of chemical pumps?
1. Oil seal:
It is a self tightening lip seal with simple structure, small size, low cost, convenient maintenance and small resistance torque. It can not only prevent medium leakage, but also prevent external dust and other harmful substances from invading. It also has a certain compensation ability for wear, but it is not resistant to high pressure. It is generally used in chemical pumps in low-pressure occasions.
2. Gasket seal:
The gasket is the basic element of the static seal of centrifugal pump, which is widely used. The selection of gaskets is mainly determined by the factors such as the medium conveyed by the chemical pump, temperature, pressure and corrosivity.
3. Thread seal:
Generally, there are two types of chemical pumps, one is screw connection gasket seal, and the other is thread plus filling seal, both of which are used for small diameter thread connection sealing occasions. The sealing element of the gasket seal of the threaded electric diaphragm pump is the gasket, and the thread only provides the compression force.
4. Labyrinth seal:
When the design is reasonable, the processing is excellent, the assembly is complete, and the speed is high, the labyrinth seal effect is good. However, in practical applications, there are many chemical pump leaks, so they are not commonly used in chemical pump seals.
5. Packing seal:
It is to put the packing with compressibility and resilience into the stuffing box, and convert the axial compression force of the gland into the radial sealing force, so as to play a sealing role.
This sealing method is called packing seal, and this packing is called sealing packing. The packing seal is widely used in the design of chemical pumps because of its simple structure, convenient replacement, low price, and wide adaptability to speed, pressure and medium.
6. Power seal:
When the chemical pump is running with, the pressure head generated by the auxiliary impeller balances the high-pressure liquid at the outlet of the main impeller, thus realizing the sealing. The auxiliary impeller does not work during shutdown, so the shutdown sealing device must be equipped at the same time to solve the possible leakage of chemical pump during shutdown.
The auxiliary impeller seal is simple in structure, reliable in sealing and long in service life. The chemical pump can achieve no leakage during operation, so it is often used in the chemical pump to transport media containing impurities.

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What are the advantages of sewage pump in operation?

 

Sewage pump is used in various fields, such as mechanical or electrical equipment, to provide various power required for equipment operation. The sewage pump has reliable quality, simple structure, stable operation, and does not need shaft seal in the actual operation process. Therefore, they are more and more used in industrial and mechanical fields. What are the advantages of sewage pumps in operation?
First, the structure is simple
The structure of the sewage pump of Shanghai Hongdong Pump Industry is not complicated, and it can easily match with different main parts of the motor. Because of its relatively simple structure and easy operation, it is easy to install and use. By changing different models or their own shapes and structures, it can meet the assembly and use requirements of different equipment. At the same time, because of the simple structure, the pump body has low failure rate and is easy to maintain.
Secondly, good stability
The sewage pump has excellent material selection and can maintain good stable performance in the process of using various parameter configurations, which is also the reason why many air pumps or water pumps choose to use. Due to its good stability, it can perform better in dynamic performance, provide more continuous power resources, and ensure the use demand of the pump body in different fields.
Finally, the sealing is good
It is reported that the sealing performance of the sewage pump during operation is very important, which can extend the service life and operation quality performance of the equipment during use. Due to its good sealing performance, the sewage pump is not easy to leak water or air, and can be used in processing and transportation industries with high requirements. Due to its good sealing performance, it will not leak various toxic gases or substances, so that the sewage pump can bring better quality performance to the equipment during use.
It can be seen that the sewage pump is favored and welcomed by various industries in the market. In fact, it is inseparable from its own quality performance and various unique advantages. With the continuous improvement of pump quality in various fields, the advantages of sewage pump in use are more and more obvious. At the same time, the amount of sewage pump is also getting more and more attention from the industry.

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Teach you to avoid mistakes in the installation of vertical multi-stage centrifugal pumps

When installing the vertical multi-stage centrifugal pump, if it is not debugged well in the early stage, it will affect the working performance in the future. Next, we will share the details and matters needing attention in the installation process of the vertical centrifugal pump.
If there are many elbows used on the water inlet pipeline, some water flow resistance will be added, and the elbow should turn in the straight direction, and it is not allowed to turn in the horizontal direction to avoid air collection. When installing the water inlet pipeline, the horizontal section is horizontal or upward, which will collect air in the water inlet pipe, reduce the vacuum degree of the water pipe and the pump, and reduce the suction head of the pump and the water output.
The correct method is to slightly skew the horizontal section towards the water source, not to be horizontal or upward. The vertical multi-stage centrifugal pump inlet is directly connected with the elbow, which will cause uneven distribution of water when it enters the impeller through the elbow.
When the diameter of the water inlet pipe is larger than the water inlet of the pump, a deflection reducer pipe should be installed. Some deflection reducers should be installed on the top of the plane and some on the bottom of the slope. Otherwise, air will be collected, water output will be reduced or cannot be pumped, and there will be a crash sound.
If the diameter of the inlet pipe and the water inlet of the water pump is equal, a straight pipe should be added between the inlet and the elbow of the vertical multi-stage centrifugal pump. The length of the straight pipe should not be less than two to three times the diameter of the water pipe. If the outlet is above the normal water level of the outlet pool, although the pump head is added, the flow is reduced.

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Assembly process of centrifugal pump

 

Introduction to the assembly process of centrifugal pump:
General requirements for assembly
1.1 The pump parts must be qualified products, and all rust prevention treatments have been completed.
1.2 During assembly, the parts shall be cleaned without oil, dirt and scrap iron.
1.3 The exposed machined surfaces of carbon steel and cast iron parts shall be coated with antirust oil or grease.
1.4 After the pump is assembled, there must be an arrow mark on the rotation direction of the pump.
1.5 After assembly, the pump must be marked, and the method shall be implemented according to Q/SPCN.G.28001 "Product Identification and Traceability Control Procedure".
1.6 After passing the pump performance test, the water in the pump shall be removed, and the carbon steel pump body flow passage, carbon steel impeller flow passage and external surface as well as carbon steel pump shaft shall be coated with antirust oil or grease. Anti rust process of the machine.
1.7 Before packaging the pump, install a 5mm thick Q235-A material blind plate at the inlet and outlet of the pump body. If there is a matching flange, install it on the blind plate.
2. Requirements for assembly and Z final assembly
2.1 When assembling flat keys and bearings, do not knock them directly with a hammer. They shall be assembled with wooden hammers, copper rods or special assembly tools.
2.2 When the inner diameter of the bearing is an interference fit such as r6 and s6, it is necessary to conduct hot assembly, and the temperature is 80-120 ° C.
2.3 The connecting end of stud bolt and parent body shall be coated with dry oil, and the length shall be consistent and tightened evenly.
2.4 During the assembly process, it is strictly forbidden to scratch the surface of parts, especially the mating and sealing surfaces, so as not to affect the assembly quality.
3. Assembly of mechanical seal
3.1 During assembly, each joint surface shall be closely matched, and the friction surface shall be coated with industrial Vaseline.
4. Assembly
4.1 When assembling the coupling, lubricate the inner hole, journal and key. Use even force during assembly to avoid damage to parts due to impact.

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The centrifugal pump manufacturer tells you the difference between centrifugal pump and self-priming centrifugal pump

 

The centrifugal pump manufacturer pointed out that in order to better discharge the gas in the moisture absorption pipe and generate a certain vacuum value when the centrifugal pump is working, the exhaust pipe must be used. For small pumps, the pump casing and water inlet must be filled with water before operation. In order to better avoid the jump of water injection, the bottom end of the water inlet is equipped with a unilateral pump bottom valve that opens when the water flows upward and closes when it flows downward; Generally, large centrifugal pumps with water seepage specifications above 300 mm are not equipped with bottom valve of water pump, but only use professional vacuum equipment to vacuum drinking water. There is no doubt that the operation of the feed pump will cause inconvenience, resulting in waste.
Principle: Centrifugal pump works by using impeller rotation and then water to produce centrifugal movement. Before running the pump, make sure that the pump casing and the moisture absorption pipe are filled with water. Then run the motor to make the pump shaft push the impeller and water for high-speed running fitness exercise. The water will produce centrifugal movement and be thrown to the edge of the impeller. The water will be injected into the compressed water pipeline of the pump through the flow passage of the volute pump casing.
Structure: Centrifugal pump works by using impeller rotation and centrifugal movement of water. The manufacturer of centrifugal pump pointed out that the basic structure of centrifugal pump is composed of six parts, namely, impeller, pump housing, pump shaft, rolling bearing, sealing ring and ferrule joint.
Centrifugal pump manufacturer
The centrifugal pump manufacturer said that the structural type of the self-priming centrifugal pump has been improved, and it has got rid of the insufficiency of the general pipeline centrifugal pump. The characteristic of self-priming centrifugal pump is that the pump shell is double volute structure. The detergent port is located on the edge of the pump impeller, and there is a large capacity vapor liquid separation chamber on the liquid outlet. Other structures are similar to single pole single suction centrifugal pumps, including sealing rings, mechanical seals, shafts and rolling bearings. When the self-priming pump is in operation for the first time, the water diversion channel must be introduced into the pump casing, and the introduction amount can exceed the pump centerline in the pump casing. After that, the fully automatic suction pipe can be operated at any time and anywhere without introducing the diversion canal, so the application is more convenient than the pipeline centrifugal pump.
Principle: The principle of self-priming pump is to fill the pump casing with water (or there is water in the pump casing itself) before the pump runs. After running, the impeller runs at a high speed to make the water in the impeller channel flow to the volute. At this time, the channel generates a vacuum pump to open the seepage check valve. The gas in the suction pipe enters the pump and reaches the edge through the impeller channel.
Structure: Self priming centrifugal pump is a kind of centrifugal pump, but it is different from centrifugal pump in that it has "self priming" characteristics. The basic structure of the self-priming pump is composed of a suction chamber, a liquid storage chamber, a scroll chamber, a liquid collecting hole, a vapor liquid separation chamber, etc.

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How to prolong the service life of pipeline pump?

The service life of equipment has always been a topic of great concern. Many friends want to buy a device with a longer service life when they buy it. They are afraid that there will be some problems in the use process and they will have to buy a new one. In this way, the personal cost is greatly increased, which is not worth the loss. So, how can we extend the service life of pipeline pump? Next, let's analyze it together!
First of all, if you want to extend the service life of stainless steel pipe pump, you must choose a good brand. Brand is the guarantee of quality. If the pipeline pump with good quality is selected, its service time must be much longer than those with ordinary quality.
Pay attention to maintenance
As you get older, you need maintenance. Otherwise, you will look older and older. Of course, as the number of uses increases, the machine also needs maintenance. If you don't maintain the machine, its service life will be greatly reduced. How to maintain the machine better? You can go to a special machine maintenance shop to repair the pipe pump. In addition, you should clean the pipe pump regularly to prevent the accumulation of debris or garbage from affecting the operation of the pipe pump.
The operation is carried out according to the standard
Some people do not pay attention to the operation specifications in the process of using the pipeline centrifugal pump, which has brought a lot of damage to the pipeline pump. In fact, in essence, whether it is a pipeline pump or a centrifugal pump, a variety of pumps need to adopt correct operating methods.

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The manufacturer tells you what the centrifugal pump pressure gauge has

Pressure is not a benchmark, but a derived force and area. Pressure gauge, also known as pressure gauge, is an industrial automatic instrument used to measure the pressure of gas or liquid. The pressure gauge of centrifugal pump can display and record the pressure value, and can also be attached with a control device. The pressure measured by the instrument includes: pressure, atmospheric pressure, positive pressure, negative pressure and differential pressure. Most engineering measurements are pressure gauges. The unit of pressure is Pa, and other units are: engineering air pressure, millimeter water column, etc.
The main principle of centrifugal pump pressure gauge measurement is as follows: use gravity and pressure balance, such as liquid column pressure gauge, piston pressure gauge measurement; The elastic pressure balance measurement method such as mechanical pressure gauge is adopted; Use pressure related pressure gauges to measure the pressure of other physical properties of substances, such as electronic pressure gauges.
Common liquid column pressure gauges include U-tube pressure gauge, single tube pressure gauge, inclined tube pressure gauge, etc. In practical application, there are many factors that will affect its accuracy, and some specific problems can be ignored - the main factors are environmental temperature change, gravity acceleration, capillarity, etc., which need to be corrected. In addition, it also affects the scale, reading and installation. Its advantages are convenient, simple, real and cheap. Commonly used in laboratories.
At present, commonly used mechanical pressure gauges include spring tube pressure gauge, diaphragm pressure gauge, bellows pressure gauge, etc. The elastic elements are spring tubes, diaphragms and bellows. Because the displacement caused by the deformation of the elastic element is very small, it is usually used as the angular displacement or electrical and pneumatic signals of the indicator for the convenience of display. It is simple, cheap and easy to use, and is widely used in industrial fields.
Installation and technical requirements for mechanical seal of centrifugal pump: technical requirements for machine, pump and mechanical seal accessories: the bending of shaft shall not exceed 0.05mm; All parts in the assembly meet the drawing requirements. When tightening the gland, after the coupling is aligned, tighten the compression screw to prevent the deflection of the flange face; The shaft vibration during mechanical seal installation shall not be greater than 0.1mm. The axial displacement of axis C shall not be greater than 0.5mm; The manufacturing tolerance of the shaft of the mechanical seal part is h8, and the finish is 1.6; The shaft end where the dynamic ring seal is installed and the gland end where the static ring seal is installed shall be chamfered; The installation of pump mechanical seal requires that the movable ring must be able to move flexibly on the shaft after installation.
The above is what the small editor of the centrifugal pump manufacturer told us about the centrifugal pump pressure gauge. I hope it can help you.

Combined Vacuum Pumping Unit System For Overhead Atmospheric And Vacuum Distillation/Fractionation Process 

Introduction to advantages of mortar pump

Overview of corrosion resistant abrasive slurry pump:
Corrosion resistant abrasive slurry pump is a new type of piston pump developed on the basis of absorbing advanced technologies at home and abroad. Such products are powerful and widely used. The main conclusions are as follows:
(1) Engineering grouting reinforcement
Various pressure grouting of reservoirs, hydropower stations, dams, ports and wharfs
Foundation treatment, soft foundation reinforcement and grouting
Tunnel backfill grouting and bolt support, subway and mine construction
(2) Ground source heat pump deep well construction (new technology)
It can be used for mud circulation and mortar backfilling
(3) Transportation of building mortar
Weighbridge transportation, masonry or plastering mortar
(4) Mechanical spraying and plastering
Commercial mortar or equivalent mortar conveying and spraying plastering
Advantages of anti-corrosion and wear-resistant mud pump:
High working pressure, large flow, capable of conveying mortar with high sand content
This type of product adopts a pump with double cylinder structure, which can output uniform flow and overcome the shortcomings of uneven flow of existing piston pumps or piston pumps
The mortar pump is mechanically driven, with simple and compact structure, cheap wearing parts, quick and convenient replacement, simple maintenance and low cost

How to Improve the Ventilation Effect of Roots Vacuum Pump Unit

What are the methods of installing submersible sewage pump? You can do this

At present, submersible pumps and submersible sewage pumps are very popular in sewage discharge, because they are cheap, easy to use, and do not occupy space. There are several installation methods of submersible sewage pump, which can be provided for your reference. Submersible sewage pump is the abbreviation of submersible sewage pump, which is the channel based on submersible pump
At present, submersible pumps and submersible sewage pumps are very popular in sewage discharge, because they are cheap, easy to use, and do not occupy space. There are several installation methods of submersible sewage pump, which can be provided for your reference.
Submersible sewage pump is the abbreviation of submersible sewage pump. On the basis of submersible pump, the channel adopts anti blocking design for primary lifting, intermediate lifting and sludge return. It is mainly used in municipal engineering, building construction, industrial sewage and sewage treatment occasions to discharge sewage, wastewater and rainwater containing solids and long fibers.
Two common installation methods
With simple installation conditions and large flow coverage, submersible sewage pump is one of the commonly used lifting equipment in water treatment projects, especially in small and medium-sized projects. There are two common installation methods of submersible sewage pump: coupling installation and mobile installation.
The coupling installation is to connect the pump and the pipe through the coupler, which is convenient to separate the pump from the outlet pipe. The pump can be lifted by the lifting device during maintenance. Coupling installation is applicable to submersible sewage pumps of various specifications. It is a common installation method for submersible sewage pumps. Couplers are supplied in complete sets by equipment manufacturers.
Mobile installation means that the pump outlet pipeline is directly connected to the water surface through a hose, and the submersible sewage pump is placed at the bottom of the pool by its own weight or suspended on a lifting device through an iron chain. The mobile installation does not require the coupler and the pool bottom to be fixed, so it is easy to move. It can be lifted together with the pipeline during maintenance. At the same time, due to the installation mode, it is difficult to bear large torque, and it is only applicable to small submersible sewage pumps.
Explanation of installation condition diagram

Vacuum Pump Current Fluctuation of Causes and Solutions

MD wear resistant multistage centrifugal pump These configurations are indispensable!

 

MD wear-resistant multistage centrifugal pump is highly efficient, energy-saving, wear-resistant and reliable, and has a long service life. It is especially suitable for mine drainage. It pumps mine water and other similar liquids with a volume concentration of no more than 1.5% solid particles, and the liquid temperature is no higher than 80 ℃.
The existing multi-stage centrifugal pumps are generally designed with the one-dimensional theory for conveying clean water. Our company pumps coal water containing solid particles for the wear-resistant multi-stage centrifugal pumps used in coal mines. Two phase flow design theory is added to improve the pump suction performance and hydraulic design, which improves the pump suction head, reduces the impact wear of coal water in the pump, and can effectively convert energy, thus improving the pump efficiency and prolonging the service life of the pump.
MD wear-resistant multistage centrifugal pump is a sectional horizontal multistage pump. The suction port is horizontal and the discharge port is vertical. The pump is directly driven by the prime mover through the coupling. The pump rotates clockwise when viewed from the prime mover end.
MD type pump is mainly composed of stator, rotor, bearing and shaft seal:
1. The stator is mainly composed of suction section, middle section, discharge section, guide vane, etc. Each section is clamped with tension bolts to form a working chamber.
2. The rotor part is mainly composed of shaft, impeller, balance disc and shaft sleeve. The shaft transmits power to the impeller to make it work. The balance disc is used to balance the axial force. Both ends of the shaft are equipped with replaceable shaft sleeves to protect the shaft.
3. There are two types of bearings: rolling bearing and sliding bearing. One is that rolling bearing is mainly composed of bearing body, bearing and bearing gland, which are lubricated with grease. The other is that sliding bearing is mainly composed of bearing body, bearing cover, bearing pad, dust-proof disc, oil level gauge, oil slinger, etc., which are lubricated with thin oil.
4. The shaft seal adopts the packing seal, which is mainly composed of the seal box, packing and water retaining ring on the water inlet section and the packing box. The liquid in the sealing chamber plays the role of water seal, water cooling and water lubrication, and the water seal water comes from the pressure water in the pump.
Performance parameters of MD wear resistant multistage centrifugal pump:
The motor drives the impeller to rotate through the pin coupling direct pump. The blades in the impeller force the liquid to rotate, work on the liquid, and increase its energy. Under the centrifugal force, the liquid is thrown out around the impeller. The speed energy is converted into pressure energy through the guide vane flow channel. The liquid is collected and flows into the next stage impeller through the guide vane. Repeat the above impeller working process. When the liquid in the impeller is thrown out, The pressure in the impeller inlet is lower than that in the inlet pipe. New liquid is sucked into the impeller under the effect of this pressure difference, and the liquid continuously flows out of the pump.

vacuum unit for the reduction of pumping capacity of reasons

How to select micro vacuum pump?

New enterprises need to purchase new machinery to meet the needs of normal operation and production and operation of enterprises. The use of micro vacuum pump in the workshop can effectively reduce the dust and bacteria in the workshop, and improve the product quality, especially the soluble chemicals such as silicon dioxide and sodium chloride. The preservation of vacuum environment can prevent the change of chemical properties. How to select a reliable micro vacuum pump?
1. See product parameters
The product specifications of the micro vacuum pump will show various indicators of the product, which has great reference value for product procurement. The micro vacuum pump has a large pressure regulating range, small electromagnetic interference and large power, which can greatly meet the needs of various industries. For example, if the electromagnetic interference is large during the aviation test, the aircraft's running track will change. In order to avoid the interference of magnetic field, the aircraft should choose the micro vacuum pump with small electromagnetic interference.
2. View product warranty service
When purchasing the micro vacuum pump of Shanghai Hongdong Pump, the manufacturer should have a long warranty period and be honest and trustworthy. If a quality problem occurs during the warranty period and it is found that it is really a product problem, it can be replaced immediately when contacting the manufacturer, without shifting the blame. For new product functions, the manufacturer will notify customers and provide relevant services. For regular customers, the manufacturer will have a promotional activity, so they can deliver goods in advance.
3. Look at the price of the product
When selecting, compare the processes and materials of several products. Customers can ask the surrounding enterprises which micro vacuum pump is durable, investigate the market share of each brand of vacuum pump, select products with high purchase rate and acceptable equipment price, and read the operating instructions carefully before use. The service life of the machine will not be shortened due to manual errors.
Faced with the special needs of customers, the manufacturer of micro vacuum pump should provide corresponding customization services. In the customization process, both the realization of customer needs and the safety of the machine should be paid attention to, but also reasonable transformation should be carried out within the scope of safety standards. The household vacuum pump should not choose the machine with excessive current to avoid short circuit caused by excessive current. During vacuum coating, the rubber hose in operation cannot contact the skin, and excessive pressure may block the skin and blood.

Few other people's vacuum pump failures? That's because I know the seven golden rules!

Operating Instructions for Self priming Pump

The self-priming pump manual attached by many manufacturers basically introduces the self-priming pump model performance parameters, self-priming pump characteristics and scope of use, and the self-priming pump installation dimensions, but there is no specific self-priming pump instructions, * which can not meet the standards of self-priming pump manual, so it is necessary to share knowledge about self-priming pump instructions for users for reference, After the self-priming pump unit is installed and adjusted (refer to the installation of self-priming pump for installation knowledge), water can be added for trial operation.
1. Start
(1) Before starting, check whether the self-priming pump has friction and whether it can rotate flexibly. It is prohibited to start the self-priming pump when there is friction.
(2) For the self-priming pump with suspension oil chamber, check the oil level in the suspension oil chamber to see if it is within the specified range.
(3) Open the inlet valve *; Open the water injection valve to inject water into the pump to discharge the gas in the self-priming pump.
(4) Close the outlet valve and pressure gauge cock.
(5) After the above steps are completed, start the motor and open the pressure gauge cock to see whether the pressure gauge pointer is at the correct position.
(6) Open the vacuum gauge cock and slowly open the water outlet valve. At this time, the position of the pressure gauge pointer will change with the opening degree of the water outlet valve. Stop adjusting the size of the outlet valve when the pointer of the pressure gauge points to the required position under the working condition.
Note: Starting the self-priming pump when the water outlet valve is fully opened will cause overload of the motor; If the inlet valve is turned down to control the flow, cavitation will occur in the self-priming pump. Both should be avoided.
2. Run
(1) The oil level of the self-priming pump with suspension oil chamber must be kept at 1/3 and 2/3 of the oil pointer.
(2) The mechanical seal shall not have any leakage. Otherwise, replace the mechanical seal with a new one.
(3) Check whether the flow and lift (inlet and outlet pressure) of the pump are stable and meet the requirements of the working conditions, whether the current value in the ammeter is stable and within the normal range allowed by the motor, whether the self-priming pump unit has abnormal noise, whether the running noise and vibration are excessive, and whether the temperature of the bearing is within the normal range (the temperature rise of the bearing should generally not exceed the ambient temperature by 35 ℃, but the high temperature of zui should not exceed 75 ℃).
3. Shutdown
(1) Before shutdown, slowly close the water outlet valve, close the vacuum gauge cock, cut off the power, and then close the pressure gauge cock.
(2) For the self-priming pump running in series (less used), the last stage pump shall be closed first when stopping. After stopping, the outlet valve shall be closed, and then the * stage pump shall be closed.
(3) When the ambient temperature of the pump installation location is low, the liquid in the pump shall be discharged after shutdown to avoid freezing the pump or pipeline system.
If the liquid level is higher than that of the pump and water can flow into the pump body, we suggest that centrifugal pump be used. If the liquid level is lower than that of the pump, all kinds of self-priming pumps need to be selected

vacuum pump of three filtering forms

Advantages of Horizontal Screw Centrifugal Pump

1. Real non clogging performance: spiral centrifugal pump has extraordinary non clogging performance. The open economic belt of the pump has the characteristics of high efficiency and non clogging, and it is easier to transport solid and long fiber chemicals with large volume. Generally speaking, the non clogging centrifugal pump is usually hooked by the edge of the leaf when the long fiber and solid enter the safe passage, or stay or block in the middle of the import and export trade, leading to equipment failure. Equipped with spiral suction centrifugal impeller, this problem will not be met. The spiral centrifugal impeller will automatically tighten the soft plastic solid, so that the filler cannot be blocked at the inlet, and the inner chamber of the suction port and the back of the centrifugal impeller are also designed with an external thread groove in the opposite direction that can avoid fiber accumulation.
2. Mild material delivery: Another advantage of the spiral design scheme is: "mild delivery", that is, solid chemical substances pass along with the flow without colliding with all positions in the pump. This advantage can be used in the following industries: transportation of specific loose chemicals can maintain their original physical conditions, and loose chemicals are not easy to be torn and crushed. The oil in the moisturizing lotion can maintain its special characteristics. Floating fibers are not easy to be twisted or coiled. Fragile (sensitive) objects, such as tomatoes and fresh fish, are not easy to be destroyed.
3. Excellent operation curve: high efficiency=low operation cost; Steep performance curve=stable operation; Low net suction force=high natural suction capacity; Smooth output power curve=no load area; High speed rotation=delicate structure
4. High solid content material solving ability
5. Selection of adjustable wear-resistant lining: it is an ideal selection under the condition of severe damage. When damage occurs, only one lining can be removed and replaced, and it is not necessary to remove and replace all casings, which is convenient and economic.

How to carry out no-load test run of vacuum unit

Fluorine plastic magnetic pump is selected as acid and alkali resistant magnetic pump

 

CQB-F fluoroplastic magnetic drive pump adopts magnetic coupling transmission, and there is no dynamic sealing point, so the phenomenon of running, emitting, dripping and leaking at the shaft seal of general shaft drive centrifugal pump is completely eliminated. Its flow passage parts are made of fluoroplastic industrial ceramics, which have excellent corrosion resistance, sealing performance, no aging, no toxin decomposition and other advantages. The drive power below 3kW or less than DN50mm is the magnetic drive pump of perfluorinated plastics.
Characteristics of CQB-F Fluoroplastic Magnetic Pump
The magnetic pump is compact in structure, beautiful in appearance, small in volume, low in noise, reliable in operation, and convenient for use. The casing of the pump body is fixed with metal materials, so the pump body is enough to support the weight of the pipeline, and is convenient for use and maintenance. Flow: 1.8-100m3/h Lift: 8-32m Power: 0.12-22KW Applicable temperature: - 20~100 ℃
Application of CQB-F Fluoroplastic Magnetic Pump
It does not contain solid particle corrosive liquid, strong acid, strong base, ethanol, bleach, photographic solution, nitric acid, hydrochloric acid, hydrofluoric acid, acetic acid, sodium hydroxide, acetone, tetraoxyethane, seawater, brine, etc.
Model meaning of CQB-F fluoroplastic magnetic pump:
CQB50-40-125F
CQB magnetic drive centrifugal pump
50 - Diameter of suction inlet (mm)
40 - Discharge outlet diameter (mm)
125 - Nominal diameter of impeller (mm)

vacuum unit to avoid friction of methods

 

Pneumatic diaphragm pump is a new type of conveying machinery, which is the latest novel pump. Compressed air is used as the power source, and all kinds of corrosive liquids, liquids with particles, high viscosity, volatile, flammable and highly toxic liquids can be pumped out.
Pneumatic diaphragm pump has four materials: plastic, aluminum alloy, cast iron and stainless steel. The diaphragm pump adopts NBR, neoprene, fluororubber, polytetrafluoroethylene and polytetraethylene according to different liquid media. To meet the needs of different users. Anton has achieved satisfactory results in various special occasions when it is used to pump media that cannot be pumped by conventional pumps.
1、 Applicable occasions of pneumatic diaphragm pump
Because the pneumatic diaphragm pump has the above characteristics, the diaphragm pump in the world is gradually invading the market of other pumps since its birth, and has a part of it. For example, diaphragm pumps have occupied an absolute leading position in the paint and ceramic industries, while in other industries, such as environmental protection, wastewater treatment, construction, sewage discharge, and fine chemicals, they are expanding their market share and have an irreplaceable position in other pumps. The upper wind of pneumatic diaphragm pump is:
1. Because it is powered by air, the flow is automatically adjusted with the change of back pressure (outlet resistance), which is suitable for medium and high viscosity fluids. The working point of the centrifugal pump is set based on water. If it is used for the fluid with higher viscosity, it needs to be equipped with a reducer or a frequency converter. The cost has been greatly improved, and the same is true for gear pumps.
2. In flammable and explosive environment, pneumatic pump is reliable and low cost. For example, the transportation of fuel, explosives and gunpowder, because: first, it is impossible to generate sparks after grounding; Second, there is no heat generated during operation, and the machine will not overheat; Third, the fluid will not overheat because the diaphragm pump has the smallest agitation to the fluid.
3. In places where the construction site is bad, such as construction sites, industrial and mining sites
Wastewater discharge, because the impurities in the sewage are many and the composition is complex, the pipeline is easy to be blocked, so the load on the electric pump is too high, and the motor is vulnerable to heat. The pneumatic diaphragm pump can pass the particles and the flow is adjustable. When the pipe is blocked, it will stop automatically until it is smooth.
4. In addition, the diaphragm pump is small and easy to move, does not need a foundation, occupies a very small area, and is simple and economical to install. It can be used as a mobile material delivery pump.
5. In the treatment of hazardous and corrosive materials, the diaphragm pump can completely isolate the materials from the outside world.
6. Or some tests ensure that there is no impurity polluting the raw materials.
7. It can be used to transport fluids with relatively stable chemical properties, such as photosensitive materials, flocculating liquid, etc. This is due to the low shear force of the diaphragm pump, which has little physical impact on the material.
2、 Working principle of pneumatic diaphragm pump
The pneumatic diaphragm pump is a positive displacement pump that changes the volume due to the reciprocating deformation of the diaphragm. Its working principle is similar to that of the plunger pump. Because of the characteristics of the working principle of the diaphragm pump, the diaphragm pump has the following characteristics:
(1) The pump will not overheat: driven by compressed air, the exhaust is a process of expansion and heat absorption. The temperature of the pneumatic pump is reduced when it works, and no harmful gas is discharged.
(2) No electric spark: the pneumatic diaphragm pump is not powered by electricity, and it prevents electrostatic spark after grounding
(3) It can pass the liquid containing particles: since the volumetric operation and the inlet is a ball valve, it is not easy to be blocked.
(4) Extremely low shearing force on materials: how to suck in and how to spit out when working, so the stirring of materials is minimal, which is applicable to the transportation of undisturbed materials
(5) The flow is adjustable. A throttle valve can be installed at the material outlet to adjust the flow.
(6) It has the function of self-priming.
(7) It can run empty without danger.
(8) It can work by diving.
(9) It can transport a wide range of fluids, from low viscosity to high viscosity, from erosive to viscous.
(10) No complex control system, no cables, fuses, etc.
(11) Small size, light weight, easy to move.
(12) No lubrication is required, so the maintenance is simple, and the working environment will not be polluted due to leakage.
(13) The pump is always efficient and will not be reduced due to wear.
(14) 100% energy utilization. When the outlet is closed, the pump automatically stops, and the equipment moves, wears, overloads, and has a fever

The water ring vacuum pump produces too much waste water and the treatment cost is too high. What is a good solution?

What are the maintenance instructions for the magnetic pump?

Magnetic pump is a new product newly developed by Jiangda Pump Industry, which overcomes some shortcomings of gear oil pump,
1. Broken shaft
The magnetic pump shaft is made of 99% aluminum oxide porcelain. The main reason for the fracture of the pump shaft is that the pump runs empty,
2. The lift is insufficient.
The reasons for this failure are: there is air in the conveying medium, the impeller is damaged, the rotating speed is insufficient, the proportion of the conveying liquid is too large, and the flow is too large.
3. The bearing is damaged.
The magnetic pump bearing is made of high-density carbon. If the water supply of the pump is cut off or there are impurities in the pump, the service life of the bearing will be directly affected.
4. Insufficient flow.
The main causes of insufficient flow are: impeller damage, insufficient speed, high lift, blockage of debris in the pipe, etc.
5. The magnetic pump cannot output liquid.
The magnetic pump can not output liquid, which is a common fault of the pump. Check whether the air in the suction pipe is discharged, whether the liquid injected into the magnetic pump is sufficient, whether the suction pipe is blocked by sundries, whether the pump reverses (especially after replacing the motor or repairing the power supply circuit), remove the pump to check whether the pump shaft is broken, and check the moving ring of the pump. Check whether the stationary ring is intact and whether the carbon bearing is closely connected with the pump shaft.

prevent of water ring vacuum pump explosion to methods

Maintenance method of centrifugal pump parts

1、 Maintenance method of packing seal
1. Clean the stuffing box of the sewage pump and check the shaft surface for scratches, burrs, etc. The stuffing box shall be cleaned and the shaft surface shall be smooth.
2. Check the shaft runout. The unbalance of the rotor runout should be within the allowable range to avoid excessive vibration, which is harmful to the packing.
3. Apply sealant or lubricant suitable for the medium to the stuffing box and shaft surface.
4. For the packing packed in rolls, first take a wooden stick with the same size as the journal, wind the packing on it, and then cut it with a knife. The knife edge is 45 ° inclined.
5. Fillers shall be filled one by one, not several at a time. The method is to take a piece of packing, apply lubricant, hold one end of the packing interface with both hands, pull it away along the axial direction to make it spiral, and then put it into the journal from the incision casing. It shall not be pulled apart along the radial direction to avoid uneven interfaces.
6. Take a metal shaft sleeve with the same size and material as the packing box or with lower hardness than the shaft, push the packing into the deep part of the box, and apply a certain pressure on the shaft sleeve with the gland to make the packing precompressed. The pre compression shrinkage is 5%~10%, up to 20%. Rotate the shaft for another circle and take out the shaft sleeve.
7. Fill the second and third root in the same way. Note that when the number of fillers is 4-8, the interfaces shall be staggered by 90 °; Two fillers are staggered 180 °; 3~6 pieces shall be staggered by 120 ° to prevent leakage through the interface.
8. After the packing is completed, the gland shall be used for compaction, but the compaction force shall not be too large. At the same time, rotate the shaft by hand to make the assembly pressing force tend to parabola distribution. Then loosen the gland slightly.
9. Carry out operation test. If it cannot be sealed, compress some packing; If the heat is too high, relax it. In this way, it can only be put into use when the leakage is in the form of drops and the heat is not too high (the temperature of the packing part can only be 30~40 ℃ higher than the ambient temperature).
Technical requirements for packing seal assembly of centrifugal pump. The installation of packing seals shall comply with the provisions of the technical documents. If not specified, the following requirements shall be met:
1. Check the radial runout of the shaft at the sealing parts, and the allowable radial runout of the shaft is within 0.03~0.08mm;
2. The diameter clearance between the liquid seal ring and the shaft sleeve is generally 1.00~1.50mm, and the diameter clearance between the liquid seal ring and the stuffing box is generally 0.15~0.20mm;
3. The diameter clearance between the packing gland and the shaft sleeve is generally 0.75~1.00mm, and the clearance around shall be uniform;
4. The diameter clearance between the packing gland and the stuffing box is generally 0.10~0.30mm;
5. When there is a packing bottom ring, the diameter clearance between the bottom ring and the shaft sleeve is generally 0.70~1.00mm;
6. After the packing is compressed, the liquid inlet hole of the liquid seal ring shall be aligned with the liquid seal pipe, or the liquid seal ring is slightly inclined to the outside;
7. For the packing in rolls, first take a wooden stick with the same size as the shaft, wind the packing on it, and then cut it with a knife. The cut is 45 ° inclined.

Why the vacuum unit leaks water

Where are corrosion resistant self-priming pumps often used

The corrosion resistant self-priming pump body is superior to the all plastic self-priming pump in thermal deformation resistance, stress damage resistance caused by thermal expansion and contraction of pipelines, installation reliability and vibration resistance. In the field of self-priming pumps, the sales volume of corrosion resistant self-priming pumps has always been high. So where does this equipment stand on its own? If you want to know this problem, let's first understand its characteristics.
What are the characteristics of corrosion resistant self-priming pump
1. Corrosion resistant self-priming pump is a centrifugal pump with high efficiency and corrosion resistance. With its compact structure, convenient operation, stable operation, convenient maintenance, long service life and other characteristics, it has always been the leader in similar products.
2. It is not only applicable to a wide range of fields, but also affordable and acceptable to many enterprises.
3. The corrosion resistant self-priming pump also has a very strong sewage discharge capacity. With the special internal structure design, the water-saving function is also reflected to the extreme. The self-priming height of this self-priming pump can reach 1 meter, and the self-priming time is also very short.
Corrosion resistant self-priming pumps are found in these places
The most common areas are tea gardens, nursery gardens, large orchards, farms, etc. These places cover a large area, and his help is needed for irrigation, fertilization, pesticide farming and other work. In addition to effectively improving work efficiency, it can also effectively save the cost of raw materials. On the basis of rain and dew, it greatly saves the cost of labor. No wonder there are corrosion resistant self-priming pumps in these places. Of course, in order to achieve such efficiency, the assistance of a rocker nozzle is also needed, so that small raindrops or spray like liquid can appear.

Molecular Pump Operation for Influence of Magnetic Field Environment

Fluoroplastic self-priming pump

 

Fluoroplastic self-priming pump adopts metal shell lined with fluoroplastics, all flow passage parts are made of fluoroplastics alloy, pump cover, impeller, etc. are made of metal inserts wrapped with fluoroplastics by overall sintering and pressing, shaft seal adopts external advanced corrugated pipe mechanical seal, static ring adopts 99.9% aluminum oxide ceramic (or silicon nitride), and dynamic ring adopts tetrafluoroplastics filling material, with excellent corrosion resistance, wear resistance and sealing performance. The inlet and outlet of the pump are reinforced with cast steel body to enhance the pressure resistance of the pump. The actual use shows that the pump has the advantages of corrosion resistance, wear resistance, high temperature resistance, non aging, high mechanical strength, stable operation, advanced and reasonable structure, strict and reliable sealing performance, convenient disassembly and maintenance, and long service life.
The outstanding feature of FZB self-priming pump is its self-priming function. It can pump the liquid below the installation position of the pump, with stable performance and simple operation. You only need to fill the liquid before the first use of the pump, and do not need to fill the liquid after the second and subsequent use. You can start the pump directly. The self-priming height can be determined within 2 to 4 meters according to the density of the medium. It is the choice to replace the bulky submerged pump.
2、 Main purpose:
The flow passage components of FZB fluoroplastic self-priming pump are all made of fluoroplastic and have self-priming function. Therefore, FZB self-priming pump has a wide range of applications, such as pumping corrosive liquid in the underground tank to the target location, pumping the acid and alkali in the acid and alkali tank with no outlet at the bottom to the target location, or for circulation between multiple acid tanks, or for acid unloading, etc.

why sk vacuum pump can inject oil of detailed explanation

Analysis of Common Problems of Magnetic Pump

1. Since the cooling and lubrication of the magnetic pump bearing depend on the conveyed medium, it is prohibited to run without load, and avoid the time and space load running caused by restart after power failure during work.
2. If the conveyed medium contains solid particles, a filter screen shall be added at the pump inlet; if it contains ferromagnetic particles, a magnetic filter shall be added.
3. The ambient temperature of the pump in use shall be less than 40 ℃, and the temperature rise of the motor shall not exceed 75 ℃.
4. The conveyed medium and its temperature shall be within the allowable range of pump materials. The service temperature of engineering plastic pump is less than 60 ℃, and that of metal pump is less than 100 ℃.
Convey liquid without hard particles and fibers with suction pressure no more than 0.2MPa, large working pressure 1.6MPa, density no more than 1600Kg ／ m3 and viscosity no more than 30X10-6m2 ／ S.
5. If the delivery liquid is a medium easy to precipitate and crystallize, it should be cleaned in time after use and the accumulated liquid in the pump should be drained.
6. After the magnetic pump operates normally for 1000 hours, the bearing and end face moving ring shall be disassembled and inspected for wear, and the wearing parts that are not suitable for reuse shall be replaced.

What about vacuum pump oil emulsification?

Treatment of eccentric reducer at inlet of corrosion resistant centrifugal pump

 

With regard to the installation of eccentric reducer on the inlet pipe of the end suction centrifugal pump (i.e. the pump inlet is a horizontal inlet), in the textbooks related to the pump piping standards, it is stipulated that the diameter orientation of the eccentric reducer on the horizontal pipe (the horizontal part is upward or downward) is determined according to the absence of a liquid bag or air bag (in two cases):
1. When the medium is fed into the pump from the top to the bottom, the bottom flat eccentric reducer is used for installation, and there is no liquid bag;
2. When the medium is fed into the pump from bottom to top, the top flat eccentric reducer is used for installation, without air bag;
Generally speaking, it is "flat at the top and flat at the bottom" To find out the reason, first understand one knowledge point: cavitation phenomenon. Of course, if you only do industrial installation, you don't need to know so much, because there are complete and correct installation methods in the instructions of each pump manufacturer, just follow the drawings
1、 Cavitation phenomenon
Working principle of centrifugal pump: the driver drives the impeller to rotate through the pump shaft to generate centrifugal force. Under the effect of centrifugal force, the liquid is thrown to the impeller outlet along the blade flow path, and the liquid is collected by the volute and sent to the discharge pipe. The liquid gets energy from the impeller to increase both the pressure energy and the velocity energy, and the liquid is transported to the work site by this energy. When the liquid is thrown to the impeller outlet, a low pressure is formed at the center of the impeller inlet, which creates a pressure difference between the liquid in the suction tank and the impeller center. Under the effect of this pressure difference, the liquid in the suction tank continuously enters the impeller through the suction pipeline and the suction chamber of the pump.
According to the working principle of the centrifugal pump, the liquid flows into the impeller under the pressure difference (Pa Pk) formed between the suction tank pressure Pa and the low pressure Pk at the impeller inlet. The lower the pressure Pk at the impeller inlet, the greater the suction capacity. However, if Pk decreases to a certain limit value (at present, the saturated steam pressure Pt of liquid at the transportation temperature is the critical value of liquid vaporization pressure), cavitation will occur.
2、 The methods to improve the cavitation resistance of centrifugal pump are:
A. Improve pump structure and reduce Δ Hr, belongs to the pump design problem.
B. To improve the effective NPSH in the device: the main common method is to use the injection head suction device.
In addition, the resistance loss of suction pipeline shall be reduced as much as possible, and the saturated vapor pressure of liquid shall be reduced, that is, the suction pipeline shall be designed with larger pipe diameter, shorter length, fewer elbows and valves, and lower temperature of liquid delivery, which can improve the effective cavitation allowance of the device.
Well, after understanding the above knowledge, let's have a look. What is the role of the reducer? It is used to change the size of pipe diameter. So what's the use of changing the pipe diameter at the pump inlet and outlet? It is mainly used to reduce the flow velocity of the medium in the pipeline, so as to reduce the friction force when the medium flows in the pipeline.
3、 Serious consequences caused by cavitation:
(1) Generates vibration and noise.
(2) The working performance of the pump is affected: when the cavitation develops to a certain extent, a large number of bubbles will be generated, which will block the flow passage, making the flow, head, efficiency, etc. of the pump drop significantly.
(3) The material of the runner will be damaged, mainly due to the fatigue erosion of the metal near the blade inlet.
The horizontal eccentric reducer at the inlet of the centrifugal pump generally adopts the top flat layout, but when the reducer is directly connected with the upward curved elbow, the bottom flat layout can be adopted. The reducer shall be close to the pump inlet. The reason for flat top installation is to prevent gas from accumulating in the eccentric reducer and entering the centrifugal pump to cause cavitation damage to the pump. When the inlet diameter of the horizontal suction centrifugal pump is changed, the top flat installation is adopted for the pipeline to enter the pump from bottom to top, and the bottom flat installation is adopted for the pipeline to enter the pump from top to bottom (the top flat installation is also adopted to prevent the gas from accumulating at the pump inlet). The bottom flat installation is adopted for the medium with impurities and the suction speed is lower than the impurity settlement speed. The principle is not to form air bags.

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Treatment Measures and Effects of Stainless Steel Magnetic Pump

1) Select appropriate bearing materials. All friction pairs at the bearing are made of high-quality silicon carbide. High quality silicon carbide has high purity,
Silicon carbide content is more than 99%, resistant to ammonia corrosion, with high strength, elasticity, toughness and wear resistance, which greatly improves the anti extrusion and impact capacity of the bearing, and its service life is more than 10 times that of other sliding bearings (such as graphite).
2) Select proper thrust bearing clearance when installing the rotor. By trial installing the rotor on the bearing body and pushing the rotor to one side, the maximum clearance between the industrial bearing toilet parts of the magnetic pump can be measured (when the bearing is normal, the maximum axial displacement j generated by the rotor is between 0.13-0.15, which is adjusted to 0.3-0.5 mm. This clearance range is conducive to the formation of the liquid film between the gaps, reducing the friction between the two friction pairs of the thrust bearing, and reducing the impact force when being impacted
3) Optimize operation in process to minimize or avoid large fluctuation of working conditions; The pump reversing period shall be extended to 2 months to minimize the adverse effects of frequent pump reversing on the magnetic pump.
4) The improved magnetic pump pays attention to the process operation during operation, showing the inherent characteristics of the magnetic pump. At the same time, it has good operation performance, free of maintenance for a long time, reliable operation, and a maintenance cycle of about one year, which ensures the long-term operation of the equipment.

water ring vacuum pump of phenomenon to be avoided in maintenance

Daily maintenance is in place and production efficiency is improved 100 times

 

The water pump factory wants to tell you that as long as we understand the mechanical structure during maintenance, we can solve the problem quickly and well. The clean water centrifugal pump is a simple machine. During maintenance, we should pay attention to the use within the rated range, and we should not operate with no load. We should pay attention to avoid cavitation and steam binding. We should strengthen inspection and replace the worn sealing parts in time.
The following are the maintenance steps summarized by the water pump plant based on years of experience:
1. Check whether the pipes and joints of the clean water centrifugal pump are loose. Rotate the clean water centrifugal pump by hand to see whether the pump is flexible;
2. Add bearing lubricating oil into the bearing body, observe that the oil level should be at the center line of the oil pointer, and the lubricating oil should be replaced or replenished in time;
3. Unscrew the water diversion screw plug of the pump body of the clean water centrifugal pump and inject water;
4. Close the gate valve and outlet pressure gauge of the outlet pipe;
5. Inch the motor and Wuxi welded pipe to see if the rotation direction of the motor is correct;
6. Start the motor. When the clean water centrifugal pump is in normal operation, open the outlet pressure gauge and gradually open the gate valve, and check the motor load;
7. Try to control the flow and lift of the clean water centrifugal pump within the range indicated on the label. Xinxiang Pump Plant can obtain very good energy saving effect by ensuring that the centrifugal pump operates at a higher efficiency point;
8. During the operation of the clean water centrifugal pump in Xinxiang Pump Plant, the bearing temperature shall not exceed the ambient temperature by 35 ℃, and the higher temperature shall not exceed 80 ℃;
9. If any abnormal sound is found in the clean water centrifugal pump, stop the pump immediately to check the cause;
10. When the clean water centrifugal pump is to be stopped, first close the gate valve and pressure gauge, and then stop the motor;
11. The lubricating oil of the clean water centrifugal pump shall be changed every 500 hours after 100 hours within one month of operation;
12. Regularly adjust the packing gland to ensure that the leakage in the packing chamber is normal;
13. Regularly check the wear condition of the shaft sleeve, and timely replace it if it is worn seriously;
14. When the clean water centrifugal pump is used in cold winter, the drain plug at the lower part of the pump body shall be unscrewed after shutdown to drain the medium to prevent frost cracking;
15. If the clean water centrifugal pump has been out of service for a long time, it is necessary to disassemble all the pumps, wipe off the water, coat the rotating parts and joints with grease, and store them properly.

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Need to know for selection of vertical centrifugal pump

As we all know, the vertical centrifugal pump is used to transport clean water and other basic liquids with physical and chemical properties similar to clean water. It is suitable for industrial and urban water supply and drainage, pressurized water supply for high-rise buildings, garden sprinkler irrigation, fire pressurization, long-distance transmission, and HVAC refrigeration cycle. So the use of different industries is not completely the same, so we can not choose the same product when we choose vertical centrifugal pump, so how do we choose vertical centrifugal pump reasonably?
Reasonable pump selection requires comprehensive consideration of comprehensive technical and economic indicators such as pump unit, pump station investment and operation cost, so as to conform to the principles of economy, safety and applicability. It includes the following aspects:
1) Water pumps with high efficiency, low noise and energy conservation shall be selected, and obsolete products are strictly prohibited.
2) . The pump shall be selected according to the design flow and the required lift, and considering that the pump output decreases due to wear and other reasons, the pump can be selected by multiplying the calculated lift H by a coefficient of 1.05~1.10; The pump with the characteristic curve of gradually decreasing head as the flow increases shall be selected, so that the pump can work stably and reliably in parallel; And the operating point of the water pump should be kept in the high efficiency range, which is not only energy-saving but also not easy to damage the parts.
3) When there is no regulating facility in the water supply network, it is better to use the speed regulating pump set or the rated speed pump set for marshalling operation of water supply. The maximum water output of the pump unit shall not be less than the design water supply flow of the community, and shall be checked according to the fire fighting conditions.
4) . The number of lifting pumps for water tank and water tower shall be reduced as far as possible, and one for use and one for standby; When a single pump can meet the requirements, it is not suitable to use multiple parallel pumps; If multiple pumps must be operated in parallel or matched with large and small pumps, their models and numbers should not be too many. Generally, they should not exceed two types, and the lift range of pumps should be similar; When running in parallel, each pump should still operate within the high efficiency zone.
5) The design water supply flow of the variable frequency speed regulating pump (group) shall meet the requirements of the maximum design flow per second in the domestic water supply system. The power supply must be reliable (dual power supply or dual circuit power supply); The working point of the pump shall be selected in the efficient working area of the pump characteristic curve (Q-H curve), and not in the extension line of the Q-H curve. The most unfavorable working point shall be designed at the right end of the efficient section of the pump characteristic curve, that is, the point where the pump has the largest water output, but the head is low but can meet the requirements, that is, the intersection point between the low point of the efficient section of the pump characteristic curve and the pipe characteristic curve. The working range of water pump speed regulation shall be within the high efficiency range of water pump as far as possible; The speed regulation range should be set between 25% and 100% of the water supply of the pump; The equipment shall have automatic water level control function.
6) The water pump unit of the domestic pressurized water supply system shall be equipped with a standby pump. The water supply capacity of the standby pump shall be greater than the water supply capacity of the largest operating pump. The pump shall be automatically switched and operated alternately.
7) The voltage of the motor equipped with the water pump shall be the same, and the power supply system shall be the same as that of the national grid.

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Anti corrosion measures for stainless steel magnetic pump

At present, the chemical pumps used by the major petrochemical, chemical, pharmaceutical, printing and dyeing and other chemical enterprises in China can be divided into metal pumps and non-metallic pumps. However, corrosion prevention is required. Corrosion resistance is generally made of stainless steel. There are stainless steel self-priming pumps and stainless steel magnetic pumps in stainless steel pumps. Most of the non-metallic materials are cast iron shells lined with high molecular polyethylene, such as desulfurization pumps and mortar pumps, and also lined with fluoroplastic materials, such as fluoroplastic pumps, fluoroplastic magnetic pumps, and fluoroplastic self-priming pumps. Today, let's talk about the anti-corrosion measures of the stainless steel magnetic pump in the stainless steel pump. Only with effective measures can the pump have a long life and safe use in chemical production.
According to the physical analysis, since ordinary chemical pumps are basically two-stage motor pumps, with a rotating speed of 2900r/min, cavitation and turbulence corrosion easily caused by excessive rotating speed are the main causes of corrosion, and F, Cl intergranular separation and local corrosion, as well as high solid content are another important causes of corrosion aggravation, so the pump should be modified. Through the query and test of relevant data, stainless steel was selected, A new type of stainless steel magnetic pump is also used. The performance parameters of the pump are consistent with those of the previous pump, while the speed is reduced by one time to 1450r/min, which significantly reduces the corrosion rate. At the same time, the dynamic seal is used to effectively prevent leakage.
Improve the material of the pump
Through the analysis of the medium composition, it is decided to select a high grade stainless steel, in which the composition of Cr, Mo and Ni shall be matched and controlled accordingly. In addition, a certain amount of CLl element shall be added to improve the corrosion resistance of the alloy, while improving the heat treatment process level of parts and the accuracy of spare parts processing. Stainless steel 304: general model; 18/8 stainless steel. Products such as: corrosion resistant containers, tableware, furniture, railings, medical equipment. The standard composition is 18% chromium plus 8% nickel. It is a non-magnetic stainless steel whose metallographic structure cannot be changed by heat treatment. GB grade is 0Cr18Ni9.
304 L: It has the same characteristics as 304, but is low in carbon, so it is more corrosion resistant and easy to heat treat, but has poor mechanical property, and is suitable for welding and not easy to heat treat.
The practice has proved that the measures taken by our factory are very effective to ensure the safety and stability of various corrosion media, can obviously solve the corrosion problem, and has achieved better economic and environmental benefits. Therefore, we believe that with the improvement and development of manufacturing technology in the manufacturing industry, the pump problem in the chemical industry will be gradually solved.

screw vacuum pump of leakage inspecti

Disassembly and assembly steps of horizontal clean water centrifugal pump

The centrifugal pump needs to pay attention to maintenance, which requires the operator to be very familiar with the water centrifugal pump, not only to have rich maintenance experience, but also to understand the working principle, disassembly, maintenance, installation, etc. of the centrifugal pump. The following is the removal and installation procedure of horizontal water centrifugal pump.
Disassembly and assembly steps of horizontal clean water centrifugal pump:
Before the installation of horizontal centrifugal pump, first check whether the parts are bumped and worn, clean them, and then assemble them.
(1) First, tighten the connecting bolts and plugs on the corresponding parts.
(2) Place the O-ring, paper pad, felt, etc. on the corresponding parts.
(3) First, install the seal ring, packing ring, packing ring, packing gland, etc. into the pump cover in turn.
(4) Install the rolling bearing on the shaft and then on the suspension, close the gland, press down the rolling bearing, and sleeve the connecting bolt on the shaft.
(5) Install the shaft sleeve on the shaft, and then install the pump cover on the suspension. Install and tighten the impeller, stop washer, impeller nut, etc. Then assemble the above accessories into the pump, and tighten the connecting bolts on the pump body and pump cover.
In the above installation process, the components that are easy to be ignored, such as O-ring, flat key and water retaining ring, can be put into the sealing bag.
From step (5) to step (1), the disassembly sequence of the horizontal clean water centrifugal pump can be reversed.

Water Ring Vacuum Pump Of Repairing The Worn Bearing Position Of Attention Should Be Paid To The Details 

What are the functions of centrifugal pump self flushing

Centrifugal pumps are commonly used in the chemical industry. Fluoroplastics centrifugal pump seals include mechanical seals and double end water circulation seals. Self flushing uses the medium conveyed by the pump itself to enter the seal chamber through the small hole on the end face seal gland. Mixing with the medium in the pump is called self flushing. Self flushing pump can be used. The medium delivered is generally low temperature (<100 ℃) and clean, usually light oil or water. A common explanation is that the pump self flushing cannot be used for the liquid with high temperature and viscosity, because such liquid will damage the pump when entering the pump, and the viscosity will make it difficult for the liquid to enter the pump.
Self flushing means that a thin pipeline is led from the pump outlet to the pump chamber after passing through the sealing surface or to the inlet through piping, or a pumping ring (such as a small impeller) is set in the sealing chamber to circulate the sealing liquid, which is used to warm the clean liquid that is below 80 ℃ and does not contain particles; For the flushing liquid with high temperature, it can be added to the cooler and enter the sealing surface after cooling. For the liquid containing particles, it can be added to the filter to remove the particles and then enter the sealing surface.
There are generally four self flushing functions:
1、 Flushing function, flushing impurities between the friction between the moving ring and the stationary ring;
2、 For lubrication, a layer of liquid film is kept between the sealing faces for lubrication;
3、 Cooling effect: take away the heat generated by friction between moving ring and stationary ring during working time, reduce the temperature of sealing elements, and extend the service life of seals;
4、 Sealing function: prevent the air outside the pump from leaking into the pump to play a sealing role.

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