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.

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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.

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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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What are the working principles of gear pump

Gear pump is one of the most widely used rotor pumps in the coating industry. According to different gear meshing modes, gear pumps can be divided into external gear pumps and internal gear pumps. External gear pumps are widely used, and generally referred to as gear pumps.
The working principle of the gear pump: 1. The gear pump delivers liquid by relying on the volume change of the working space caused by the meshing process of the gears.
Working principle II of gear pump: the working space is composed of the pump body, pump cover and the grooves between the teeth of the gear, and the meshing gear teeth divide this space into the suction chamber and the discharge chamber. When a pair of gears rotate, the gear teeth located in the suction chamber gradually withdraw from engagement, so that the volume of the suction chamber gradually increases and the pressure decreases. The liquid enters the suction chamber along the suction pipe until it fills the entire tooth space.
Working principle of gear pump 3. With the rotation of the gear, the liquid entering the teeth is brought to the discharge chamber. At this time, the gear teeth enter the mesh, occupying the volume between the teeth, so that the volume of the discharge chamber becomes smaller, and the liquid is forcibly discharged. When the gear pump is running, the liquid sucked in is full of the slots.
Working principle of gear pump 4. As the gear rotates, the liquid is transported to the high-pressure area along the shell wall. Because the two gears mesh with each other, the liquid in the gear slot at the meshing point is squeezed out and discharged into the outlet pipeline. At this time, a negative pressure area is formed in the enclosed space, and the liquid at the pump inlet is pressed to the pump suction under the action of atmospheric pressure.
Working principle of gear pump V. The discharge pressure of gear pump is high, the volume is small, and the flow is not large. In paint production, it is generally used to transport solvent, oil, paint and paint slurry.

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Technical innovation of motor-driven fire pump

Motor driven fire pump is a kind of fire pump which is directly connected with light engine and water pump and can be moved or fixed by manpower to put out general material fire and small oil fire. Due to the advantages of portability, flexibility and freedom from traffic, power and regional barriers, the motor driven pump has been widely used to put out the initial fire in places with poor road access conditions, such as industrial and mining enterprises, warehouses, ports, docks and rural areas, where it is difficult for fire engines to pass or reach in time.
Motor driven fire pump is mainly composed of engine, water supply system and fixed support. At present, the water inlet of the fire pump used at home and abroad is hard tubular (determined by the operating principle of the equipment), and the screw thread rotary sleeve method is generally used between the water inlet of the pump body and the water intake pipe. The main problems of this method are as follows: the user must insert the threaded joint of the water intake pipe into the threaded pipe orifice at the other end of the water pump inlet in a parallel rotation way, which is hard and time-consuming; In addition, when the water inlet pipe is aging and hard, especially in winter, it is difficult to quickly install the water inlet pipe. In case of fire, it will bring great trouble to users. In case of fire alarm, fire fighting is against time, so the application of this technology greatly reduces the difficulty of operation and improves the actual application performance of the product.
Zhejiang Yu'an improved the original product. After the improvement, the products were compared. The specific parameters (of the same group of operators) are as follows: the water filling time of the fire pump before the improvement is 110 seconds; The water filling time of the improved fire pump is 40 seconds.
So where is 70 seconds saved? 1. When the motor-driven fire pump is under vacuum, Yu'an adopts the one-way valve technology, which eliminates the need to manually close the connection switch for 6 seconds; 2. After Yu'an improved the connection between the water inlet and the water diversion pipe of the fire pump, the time required for the quick coupling connection method is 1 second; It took 65-95 seconds for the original thread mode; How long does it take for a fire to burn violently from the initial stage? Class A fire generally lasts about 5 minutes; Class BC fire generally lasts about 2 minutes; It can be seen that the application of this technology will greatly improve the fire extinguishing efficiency, effectively control the further upgrading of fire, and greatly improve the excellent performance of this product.

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Sewage lift pump has some characteristics

 

As a kind of water body that will inevitably be discharged in our life, sewage treatment is also essential. In the process of treatment, a kind of pump body needs to be used. This kind of pump body is sewage lift pump. This kind of pump mainly focuses on four parts. Some of them are pumps, some are motors, and some are topics and control systems. In terms of application, it is also very extensive. It is mainly used in families, Besu and some small and medium-sized business places. Whether on the ground or under the liquid, such pumps can work accordingly.
The main function of sewage lift pump is to discharge sewage. Therefore, it depends on the performance of such products, mainly on your pollution discharge capacity. It adopts single or double impeller structure, which can greatly improve the entire sewage discharge capacity. The whole pump body is compact in structure and very small in volume. This feature can ensure that the pump body has a very good carrying capacity. Not only that, but also the noise it produces is very small. In the process of work, it has a high power saving function. In any case, it is quite convenient to check. As long as it is in the water environment, it can work. In this way, a lot of project cost can be saved in the process of construction.
The sewage lift pump is also equipped with a float switch, which can change according to the change of liquid. Automatically control the start or stop of the pump body. For this type of pump, it does not require special personnel to take care of it, and it is quite convenient in the process of use. It is very convenient not only in the process of use, but also in the process of installation and maintenance. This is also the reason why such pumps are widely used.
Sewage lift pump is very popular in our life. If you want to buy this kind of pump, but don't know how to choose it, you might as well choose Chongqing Zhongbai Pump Industry Co., Ltd. This company has many years of technology in the production and manufacturing of pump bodies. The produced pump body is not only of good quality, but also of high cost performance. It will provide you with pumps of different models, varieties and prices. No matter what kind of pump you want. They can be provided to you.

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How to avoid reverse flow of wear-resistant centrifugal pump?

In fact, the operation process of wear-resistant centrifugal pump is not very complicated, but it only needs to be used correctly. Even with the help of instructions or professionals, there will always be some problems that they cannot help. This requires us to constantly understand new content and solve new problems in the process of use, so as to better use the equipment.
The centrifugal pump can only discharge water when it is above 30-35Hz, because the higher head of the pump's performance curve must be greater than the net head of the pump, or the working head of the wear-resistant centrifugal pump running in parallel, and this frequency corresponds to the lower frequency of the variable frequency operation of the pump.
When the frequency is below very low frequency, the wear-resistant centrifugal pump does not produce water and has no effective power output. Its loss is only the no-load loss of the pump. Therefore, the current and power of the motor are very small. At this time, the efficiency of the pump drops to a lower value.
Once the operating frequency is higher than the lower frequency, the flow of the wear-resistant centrifugal pump after water discharge must overcome the resistance of the pipe network on the one hand and the net head on the other. Therefore, the pump power and motor current increase significantly, with a sudden jump, and then continue to increase with the increase of frequency.
Since the variable frequency pump always has a flow, there is no phenomenon that the flow of the power frequency pump flows back to the variable frequency pump. In the actual project, the pipeline is also equipped with a check valve. If the frequency of the frequency converter is lower than a lower frequency, the variable frequency pump does not discharge water, and the check valve automatically closes to prevent water from flowing back.

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Flow regulation method of non clogging pulp pump

 

In practical work, in order to achieve ideal working efficiency, it is necessary to control and adjust the flow of the non clogging pulp pump. In order to achieve this goal, we must first understand the factors that affect the flow of the non clogging pulp pump.
Internal causes affecting the flow of non clogging pulp pump:
The outlet pipe is not unblocked or the impeller is blocked, the impeller falls off or is damaged, the bottom of the pump is severely worn or blocked by debris, the pipe impeller is blocked, the seal ring is damaged, the pressure is insufficient, or the rotation speed of the non blocked pulp pump is too slow.
External factors affecting the flow of non clogging pulp pump:
The installation height of the non clogging pulp pump is too high (the impeller is too close to the horizontal plane), the density or viscosity of the liquid medium conveyed by the non clogging pulp pump is too high, and the working head of the non clogging pulp pump is too high.
Flow regulation method of non clogging pulp pump:
1. Throttle regulation. For the pump unit with gate valve installed in the outlet pipeline, if the gate valve is closed for a short time, the local resistance in the pipeline will increase, the pipeline characteristic curve will become steeper, and its working point will move to the top and move to the left along the QH curve of the pump. The smaller the gate valve is closed, the greater the resistance and the smaller the flow rate.
2. Speed change adjustment. By changing the speed of the motor of the non clogging pulp pump, the performance of the pump and the operating point of the pump are changed, so as to achieve the purpose of regulating the flow of the non clogging pulp pump.
3. Reducing adjustment. After the impeller is turned, the performance of the water pump will change according to certain rules, thus changing the working point of the water pump.
4. Variable angle adjustment. By changing the installation angle of the blade, the performance of the pump and the working point of the non clogging pulp pump can be changed, so as to adjust the flow of the pump.

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Impeller Anti blocking Design of Self priming Sewage Pump

The anti blocking design of the impeller of the self-priming sewage pump ensures high efficiency and no blocking. Excellent hydraulic model is adopted, and the efficiency is 3~5% higher than that of general self-priming sewage pump. The self-priming height is 1m higher than the general self-priming sewage pump, and the self-priming time is shorter.
The self-priming sewage pump adopts the pump body structure of axial liquid return. The self-priming sewage pump body is composed of a suction chamber, a liquid storage chamber, a scroll chamber, a liquid return hole, a gas-liquid separation chamber, etc. after the self-priming sewage pump is normally started, the impeller sucks in the liquid stored in the suction chamber and the air in the suction pipe together, and is fully mixed in the impeller. Under the action of centrifugal force, the liquid entrains the gas to flow to the outer edge of the scroll chamber, forming a white foam belt with a certain thickness and a high-speed rotating liquid ring on the outer edge of the impeller. The gas-liquid mixture enters the gas separation chamber through the diffusion tube. At this time, due to the sudden decrease of the flow rate, the lighter gas is separated from the mixed liquid, and the gas continues to rise and discharge through the pump body outlet. The degassed liquid returns to the liquid storage chamber, enters the impeller again through the return hole, mixes with the gas inhaled from the suction pipe inside the impeller, and flows to the outer edge of the impeller under the action of the high-speed rotating impeller. As this process goes on repeatedly, the air in the suction pipe decreases continuously until the air is exhausted, and the self-priming sewage pump completes the self-priming process, and the self-priming sewage pump is put into normal operation.
The self-priming sewage pump is a sewage pump with a certain self-priming capacity, and its self-priming height is also limited. How to improve its self-priming height in product technology and how to improve its self-priming capacity during installation and use are the focus of our research and analysis.
The self-priming sewage pump is known as a vacuum pump product that can pump water. It combines the structural characteristics of the water ring vacuum pump and the self-priming sewage pump, which can quickly generate high negative pressure and transport high proportion of chemical media. It uses the impeller, pump body and cover plate to form a multi-channel sealing chamber for rapid exhaust. It takes only 2 seconds to fill water at a height of 3 meters, and 8 seconds to fill water at a height of 5 meters. Compared with ordinary self-priming sewage pumps, it greatly improves the efficiency and replaces traditional self-priming sewage pumps in many fields. The self-priming sewage pump produced by our company has a high suction lift, which is also known as the high suction lift self-priming sewage pump. The pump shaft and motor shaft are integrated, and have better stability. It is easier to use than the oil barrel pump in barrel loading and transportation. It can not only completely transport the media at the bottom of the barrel, but also directly switch between two barrels in one second. It can work continuously by making a multi way connector at the import. The actual use cost is lower than that of the oil barrel pump. Multiphase mixed conveying technology is a practical product in the field of conveying chemical media with high viscosity and high proportion, as well as in the food and beverage industry.
The general self-priming sewage pump does not need to install the bottom valve when the suction head is about 5 meters. If it is more than 5m, the suction head can be improved by adding a bottom valve at the end of the inlet, generally about 1m. The horizontal distance at the entrance and the number of elbows, especially the 90 degree angle and continuous turns, shall be minimized. Like centrifugation, irrigation and diversion can effectively shorten the self-priming time. Now the large flow self-priming sewage pump is equipped with a vacuum auxiliary device. Instead of irrigation and diversion, start the vacuum pump to exhaust, and the suction head is increased to more than 8 meters. The large-scale self-priming sewage pump produced by our company uses the latest semi open impeller and spiral impeller, which have good anti blocking ability and strong cutting function. The precision CNC machining technology allows the clearance between the impeller and the inner wall of the pump body to be as small as possible (the impeller of the cutting self-priming sewage pump is embedded in the mouth ring). The self-priming sewage pump with proper suction head can not only save cost but also meet the actual demand.

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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.

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Instructions for Use of Sealless Control Self priming Pump

New users will need to know some instructions when purchasing the unsealed automatic self-priming pump.
1. After the installation of the self-priming pump is completed, the discharged medium can be filled from the inlet as the initial drainage, and then no further drainage is required.
2. Please tighten the cap of the drain port, and the cap leaks, affecting the self suction effect.
3. The filter screen with buffer plate structure at the bottom of the liquid suction port can be installed to avoid damaging the self-priming pump due to excessive particle suction and affecting the self-priming function of the unsealed self-priming pump.
4. When pumping concentrated sulfuric acid, it is forbidden to use water as drainage to avoid personal and equipment failures.
5. Before starting, check whether the main shaft of the self-priming pump is flexible, which can be checked by inching, and the running direction should be consistent with the mark.
6. The weight of the suction and discharge pipes shall not be supported on the outlet flange of the self-priming pump, but shall be fixed on the support frame. The support frame shall be purchased by the user. All parts of the pipe connection shall be tight and air tight, otherwise the self-priming performance and flow head will be affected.
7. When pumping the liquid with crystals or sediments, if the pump is not used for a long time, the accumulated liquid in the pump should be drained to avoid crystals or sediments left in the pump, which may cause damage when the pump is started again.
8. If there is no crystal or sediment in the pump suction, if it is stopped for a long time for secondary use, you can check whether the liquid is sufficient from the drainage port. If not, it can be insufficient before self suction.
9. When pumping liquid, the flow, lift and suction head shall be strictly controlled within the specified range of the selected model. Otherwise, it will cause motor overcurrent fluctuation and affect operation.
10. If used in containers below the ground.
11. If the self-priming pump is used in an environment below the liquid level.
12. If liquid is supplied to high level tank or water tower.
13. When the medium with bubbles, high lift, large specific gravity and excessive static pressure of the water column in the outlet pipeline system is discharged, the exhaust speed can be accelerated and the self-priming time can be shortened.
14. In case of fire fighting system of water pressure pool, the water outlet time shall be shortened to a greater extent.
15. It is used instead of pipeline pump and closed circulating system.
16. The drainage outlet, overflow outlet, vent, self-priming exhaust device and outdoor cover are all independent of the system connection.
17. If it is designed to be used in an environment where the liquid outlet speed is required, the diameter of the suction pipe of the self-priming pump cannot be expanded, otherwise the liquid suction speed will be affected.

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Six Reasons for Head Reduction of Pipeline Pump

During the operation of the pipeline, some factors may reduce the head. The following are the six reasons.
1. Impeller passage blocked
The blockage of impeller flow passage will affect the work done by the impeller, and the pressure at the outlet will drop. This problem can be prevented by removing the pump body, removing foreign matters, and installing a filter device at the pump inlet.
2. Internal leakage occurs
The clearance between the rotating part and the stationary part of the pump body is too large, which exceeds the design index, and internal leakage will occur. The phenomenon is that the discharge pressure of the pump decreases, such as the clearance between the impeller ring and the interstage clearance of multistage pump. At this time, the corresponding inspection and replacement of components should be carried out.
3. Cavitation at inlet
When the inlet pressure of the pump is too low, lower than the saturated vapor pressure of the pumping ring, cavitation will occur. The solution is to check whether the inlet pipeline system is blocked, whether the opening of the inlet valve is too small, or increase the liquid level of the suction pool.
4. Speed decrease
The important factors for head reduction are the outer diameter of the impeller and the speed of the pump. Under the same conditions, the head is in direct proportion to the quadratic power of the speed, so the speed has a great impact on the head. Some reasons reduce the speed of the pump, which will affect the head. At this time, check the speed of the pump. If the speed is not enough, find out the cause and eliminate it.
5. The operating point is shifted to large flow and low lift
In most cases, the interest energy has a continuous rural performance curve, and the flow increases as the head decreases. In use, if there is some factor that causes the back pressure of the pump to decrease, the working point of the pump will shift to the point with large head and flow along with the device curve, which will cause the head to decrease. This is mainly caused by the change of external factors, and has nothing to do with the pump itself. It can be solved by increasing the pump back pressure.
6. Motor reverse
Improper wiring results in the motor steering contrary to the actual requirements of the pump. Normally, observe the rotation direction of the pump when starting. If it reverses, exchange any two wires of the terminal on the motor.

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Exhaust and water filling method of centrifugal pump

When the centrifugal pump is started, it will carry out the actual operation of exhaust and water filling, which can make the machine run more effectively. So next, I'll explain the water filling and exhaust methods of this machine in detail. Let's take a look.
Since the centrifugal pump generates vacuum pump and water seepage after the pressure in the pump is discharged by the centrifugal impeller, in addition to the centrifugal pump and the self suction pump with the centrifugal impeller immersed in water, it is generally necessary to fill the pump with water before starting the pump every time, which is also known as adding a diversion channel. There are two ways to fill water: one is to fill the pump immediately (at this time, the air outlet should be opened to drain the gas in the pump); The second is to pump out the steam in the pump, create a certain vacuum value (at this time, close the stop valve at the outlet), and introduce water resources.
1. Install gate valves at the inlet and outlet to fill water. This type of method is to install a gate valve at the water inlet, and then fill the pump with water after connecting the tap water pipe.
2. Fill water with hand pump. Some pumps have built-in hand pressure pumps, and small and medium-sized hand pressure pumps can also be purchased or made by ourselves. Stop valves must be installed on the inlet pipes. After closing the gate valve tightly, fill the water pressure machine with a small amount of water to carry out the diversion channel. After manually pressing the water output of the pump, it indicates that the pump is filled with water and can be started.
3. Exhaust and fill water with vacuum technology. The self exhaust of centrifugal pump is the same as the negative pressure exhaust of mechanical pump, so the water ring mechanical pump exhaust can fill the water channel.
Therefore, when the centrifugal pump cannot perform the actual operation of exhaust and water filling normally, it must be repaired immediately to prevent endangering all normal applications of machinery and equipment, or it will continue to cause damage to machinery and equipment at a certain level.

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Features of sealless self-priming pump

We usually have WFB type and other types of sealless Self-priming pumps. This sealless self-priming pump is a very popular type of pump and valve products today, because it has very unique advantages. The following are the main characteristics:
1. The sealless self-priming pump produced by our company adopts the "ring-shaped multi-sided centrifugal sealing device for pump", which eliminates the packing seal, packing seal and mechanical seal of the traditional water pump, and completely overcomes the "running, emitting, dripping and leaking". It is the most ideal equipment to replace various long shaft underwater pumps and submersible pumps.
2. It has superior automatic control function and can be used in combination with high-tech fields and highly automated systems.
3. During operation, the sealing device is free of friction and damage, and its service life is more than 10 times longer than that of similar products.
4. Small vibration, low noise, flexible movement, easy disassembly, easy installation, no need for anchor fixation.
5. Transplanting the principle of vacuum pump, the self-priming performance is stable and reliable. In particular, the "electric air control valve" truly realizes "one drainage, life-long self-priming".

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Usage and advantages of sewage pump in the project

The submersible sewage pump is a kind of pump product which is connected with the motor and works underwater at the same time. Compared with the general horizontal pump or vertical sewage pump, the submersible sewage pump has the following advantages:
1. Compact structure and small floor area. Since the submersible sewage pump works underwater, it can be directly installed in the sewage tank without building a special pump house to install pumps and machines, which can save a lot of land and infrastructure costs.
2. Easy installation and maintenance. Small submersible sewage pumps can be installed freely, and large submersible sewage pumps are generally equipped with automatic coupling devices for automatic installation, which is quite convenient for installation and maintenance.
3. Long continuous operation time. Because the pump and motor are coaxial, the shaft is short, and the rotating parts are light, the load (radial) borne by the bearing is relatively small, and the service life of the submersible sewage pump is much longer than that of the general pump.
4. There is no cavitation damage, irrigation and water diversion. In particular, the latter point brings great convenience to operators.
5. Low vibration and noise, low motor temperature rise, no pollution to the environment.
It is precisely because of the above advantages that submersible sewage pumps have been paid more and more attention by people, and the scope of use has become wider and wider. From the original simple use of conveying clean water to the present, they can convey all kinds of domestic sewage, industrial wastewater, construction site drainage, liquid feed and so on.
It plays a very important role in municipal engineering, industry, hospital, construction, hotel, water conservancy construction and other industries.
However, everything is divided into two, and the most critical issue for the submersible sewage pump is the availability, because the submersible sewage pump is used underwater; The medium to be conveyed is some mixed liquids containing solid materials; The pump is close to the motor; The pump is arranged vertically, and the weight of rotating parts and the water pressure borne by the impeller are in the same direction. These problems make the requirements of submersible sewage pump in sealing, motor bearing capacity, bearing arrangement and selection higher than those of ordinary sewage pumps.
In order to improve the service life of the submersible sewage pump, most manufacturers at home and abroad are now trying to find ways to protect the pump, that is, when the pump has leakage, overload, overtemperature and other faults, it can automatically alarm and automatically stop for repair. However, we believe that it is necessary to set up a protection system in the submersible sewage pump, which can effectively protect the safe operation of the electric pump.
However, this is not the key to the problem. The protection system is only a remedy after the pump fails, which is a more passive method. The key to the problem should be to start from the root and completely solve the problems of sealing and overload of the pump, which is a more active way. Therefore, we apply the hydrodynamic sealing technology of the auxiliary impeller and the non overload design technology of the pump to the submersible sewage pump, which greatly improves the sealing reliability and bearing capacity of the pump and extends the service life of the pump.

Pneumatic ball valve manufacturers teach you how to choose ball valves

Self priming sewage pump with strong sewage discharge capacity

The self-priming sewage pump integrates self-priming and non clogging sewage discharge. It adopts the axial reflux external mixing type. Through the unique design of the pump body and impeller flow passage, it can not only suck and discharge the liquid containing large particle solids and long fiber impurities without installing the bottom valve and filling water as the general self-priming clean water pump, but also can be widely used in municipal sewage projects, river pond aquaculture, light industry, paper making, textile, food, chemical industry, electricity, fiber The most ideal impurity pump for chemical media such as slurry and mixed suspension.
Advantages of self-priming sewage pump:
1. Strong sewage discharge capacity: the special impeller anti blocking design ensures that the pump is efficient and free of blockage.
2. High efficiency and energy saving: excellent hydraulic model is adopted, and the efficiency is 3-5% higher than that of general self-priming pump.
3. Good self-priming performance: the self-priming height is 1m higher than the general self-priming pump, and the self-priming time is shorter.
Application scope of self-priming pump:
1. Used for handling non flammable and explosive liquids;
2. Rainwater and general sewage;
3. Municipal sewage project, construction site, civil air defense system drainage station;
4. Industrial wastewater from light industry, paper making, textile, food, chemical industry, power industry, mining and other industries;
5. Sewage discharge in residential area;
6. Sewage and sediment of water purification system;
7. Leather industry, slaughterhouse sewage and pond aquaculture; Wine making and sugar industry;
8. Discharge sewage that is not highly corrosive but has been seriously polluted.
The self-priming sewage pump is suitable for conveying industrial water and urban domestic sewage. Its greatest advantage is that it can convey sewage containing solid particles and fiber materials. It integrates self-priming and non clogging sewage discharge. It not only does not need to install bottom valves and lead water like the general clean water self-priming pump, but also can pump the dirt, sediment, waste ore impurities, feces treatment and all engineering sewage containing large particle solid blocks and long fibers. It completely reduces the labor intensity of workers, and is easy to move and use, install, with little maintenance and stable performance.

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Introduction to adverse effects of idling of magnetic pump

The damage to the air and the cost of the magnetic pump will be great. The idling of the magnetic pump causes damage to many components, one pump body, inner magnetic steel, outer magnetic steel, stationary ring, impeller, isolation sleeve, pump shaft, thrust ring, seal ring, etc. In the process of using the magnetic pump, idling is the cause of many failures, so users must understand that the magnetic pump is not idle. Next, Xiaobian briefly explains why the magnetic pump is not allowed to idle. The main reasons are as follows:
1. The magnetic pump cannot idle, because the magnetic pump of the magnetic cylinder is composed of cooling medium, and air will cause the magnetic cylinder to lock.
2. Most of the bearings of the rotor of the magnetic pump are made of cemented carbide and lubricated by the medium. The pump cannot be lubricated.
3. After the pump is empty, there is no material to cool the pump, so it is possible to directly burn the diaphragm.
4. The core components of the magnetic pump are the outer magnetic component and the inner magnetic component. If it idles, the core components will be demagnetized at high temperatures and the performance of the magnetic pump will be greatly reduced after demagnetization.
Magnetic pump
In addition, in order to ensure the stability of the magnetic pump, regular maintenance of the equipment is also a way to reduce the failure rate of the equipment, including:
1. The front end of the magnetic pump shaft is equipped with a stuffing box with reliable sealing function. At the same time, a mechanical seal device is installed on the bearing seat, so that a large amount of leakage will not occur and a small amount of leakage will be discharged through the leakage port. It is normal to have a small amount of leakage at the beginning of the start-up operation. After the sealing surface is operated for a certain period of time, the leakage will be reduced or stopped.
2. There are two ball bearing pedestals, which lubricate one ball bearing on the pump impeller side of the magnetic pump with the transmitted heat-transfer oil, and one ball bearing on the coupling side is lubricated with high-temperature grease: each ball bearing must be disassembled after 3000 hours of operation to clean the diesel engine for inspection. If the contact surface is damaged, it must be replaced with a new one. When the ball bearing is installed on the impeller side, the side of the dust cover should be installed on the impeller and opened before the machine is filled with heat transfer oil.
3. The magnetic pump shall not be less than 30% of the continuous operation under the design flow. If it is necessary to operate under this premise, the bypass pipe should be installed at the outlet, and the flow will reach the minimum.
4. Check the looseness of the anchor bolts, whether the temperature of the stainless steel magnetic pump casing is consistent with the inlet temperature, the fluctuation of the outlet pressure gauge and the vibration of the pump.
5. Pay attention to no noise during the operation of the magnetic pump, and deal with it in time if it is found to be in normal condition.

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How to carry out daily maintenance of mortar pump

In the last issue, we talked about several reasons for the low efficiency of the mortar pump. Today, we will teach you how to carry out the daily maintenance of the mortar pump, so as to improve the operating efficiency ratio of the mortar pump:
1 strictly follow the operation procedures and requirements of each model of mortar pump.
2 whenever the operator changes shifts, he should check the lubrication of each component.
3. After the mortar pump is replaced with a new bearing, it should be cleaned and replaced with a new oil after 100 hours of operation. In the future, the oil should be changed every 1000-1500 hours of operation, and the grease should be changed every 2000-2400 hours of operation.
4 always check whether the operating temperature of all bearings is within the normal range. The temperature of the bearing shall not be higher than the ambient temperature by 35 ℃; The maximum temperature that the bearing can bear: the maximum temperature of rolling bearing shall not exceed 75 ℃, and the maximum temperature of sliding bearing shall not exceed 65 ℃.
5 always pay attention to the operation of the equipment. Once it is found that the mortar pump emits abnormal sound or vibration during operation, stop the machine in time and find out the cause and solve it.
6 always keep the pump and surrounding environment clean and tidy, and eliminate running, emitting, dripping and leakage in time. The sealing meets the requirements.
7 remind the maintenance personnel to take up their posts regularly, check the equipment and deal with the problems found in time.
8 if the ambient temperature of the mortar pump is low, when the pump is stopped, all waste liquid in the pump body should be drained in time to prevent the cracking of the casing and parts.

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What should be paid attention to when repairing multistage centrifugal pump

For the maintenance of multistage pump, if conditions permit, it is better to read the maintenance manual and general assembly drawing of the manufacturer first to see what special points need attention.
1、 During disassembly:
1. Before removing the thrust bearing, use a dial gauge to measure the clearance of the balance plate and make records;
2. When the multistage pump is disassembled, all parts must be marked according to the original assembly order to avoid confusion and wrong assembly during reassembly;
3. Small parts (such as keys) that are not convenient for marking can be placed together with the impeller or guide vane (middle section) of the same level.
4. During disassembly, you can intuitively feel whether there are abnormal parts, such as loose fitting.
2、 Parts maintenance:
1. Visually check whether the surface of each part is normal, and all mating surfaces must be free of collision, scratch, corrosion, etc;
2. Check whether the tolerance of key fitting parts is qualified by measuring tools;
3. Measure whether the clearance of impeller seal ring, shell seal ring, guide vane seal ring, interstage shaft sleeve, etc. is within the allowable range, and replace it if it is excessively worn;
4. Check whether the bearing is in good condition;
5. All sealing rings and gaskets shall be replaced with new ones;
3、 Reassembly:
1. 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 measuring the clearance value of each sealing ring again to ensure there is no error;
3. Before installing the balance disk, the total rotor runout shall be measured;
4. After installing the balance plate, measure the half string quantity of the rotor.
5. Compared with the total string quantity and half string quantity required on the general assembly drawing of the manufacturer, it shall basically meet the drawing requirements. Generally, the half string amount is about half of the total string amount.
6. Tighten all main bolts evenly, paying attention to the diagonal;
7. Suck a dial indicator on the shaft, rotate the shaft to mark the balance plate, and the tolerance shall not exceed 0.06 as per the drawing requirements;
8. When installing the thrust bearing, attention shall be paid to adjusting the clearance of the balance disc. The adjustment ring in front of the bearing shall be used to adjust the clearance of the balance disc to the requirements of the drawing.

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