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.

What are the functions of filter rod in Roots vacuum unit

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.

vacuum pump unit of judgment and inspection of internal leakage

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.

Dry vacuum pump system for Vacuum Degassing of steelmaking

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.

5 unknowable knowledge of Roots pump cooling: why is Roots pump called Roots pump?

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.

water ring vacuum pump of energy saving and environmental protection functions

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.

Magnetic levitation molecular pump for semiconductor industry

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?