Why are sewage pumps more susceptible to corrosion?

Nowadays, the reason why the water pump is corroded is still an extremely serious problem faced by our country and even the world, involving all departments of the national economy, we must strengthen efforts to study and solve this problem.

At present, most sewage pump products are made of metal materials. The mechanism of metal corrosion is an electrochemical phenomenon. Experimental research shows that the corrosion of metals in sand water slurry is much more serious than that in clean water. The internal corrosion of the sewage pump is caused by the slurry. The solid particles in the slurry will accelerate the corrosion rate of the flow passage parts of the pump, and also aggravate the wear.

In clean water, iron oxidizes, releasing electrons and forming anodes

Fe= Fe2+ +2e ¯

At the same time, oxygen in clean water produces oxidation-reduction reaction and forms cathode

Oz +4e- +2H2o =40H¯

If the water contains hydrogen ions, which is an acidic solution, it will produce the reduction reaction of oxygen and form a cathode

2H+ +2e¯=H

The interaction between the products of anode and cathode produces corrosion products, which are iron hydroxide, ferric oxide or ferric oxide. In clean water, the products of the reaction form a protective layer that prevents the diffusion of oxygen to the cathode, thereby reducing the corrosion rate. However, in the solid water mixture, this protective layer will be damaged by the solid particles in the water, as well as the oxide and sulfide particles in the water, which is the main reason why the corrosion of sewage pump is more serious than that of centrifugal pump.
What effect does the blockage of the cooler of the vacuum unit have on the turbine?

The equalizing pipe of multi-stage centrifugal pump is a balancing method, not an equalizing structure. Whether it is an equalizing disc or an equalizing drum (or the combination of the two) is based on these methods to equalize the thrust. So what is the function of the equalizing pipe of multi-stage centrifugal pump?

From the outlet sealing ring of the multi-stage centrifugal pump, an external pipe is led to the inlet end of the multi-stage centrifugal pump, which is called the equalizing pipe. Its key function is to balance the axial thrust of the centrifugal water pump, reduce the axial shaking of the motor rotor, and prevent the friction between the impeller and the casing.

When the multi-stage centrifugal pump is running, high-pressure water is discharged from the impeller outlet, and one unit flows behind the impeller, so that the working pressure behind the impeller is basically the same as that at the outlet, while the outside of the coaxial cable of the blade is the suction end, and the working pressure is very low. In that way, there is a large pressure difference on both sides of the impeller, which will produce an axial thrust that is biased towards the pump inlet and parallel to the shaft, so that all motor rotors will press towards the suction side. In serious cases, it will cause friction or collision between the impeller and the pump body, endangering the safe operation of the pump, so it is necessary to balance it.

There are many methods to balance the axial thrust of multi-stage centrifugal pump, such as selecting double suction impeller or symmetrical sequencing impeller (multi-stage centrifugal pump), selecting equalizing hole, equalizing disc, equalizing drum, etc. The balance pipe is only a method to balance the axial thrust. It uses the balance pipe to lead the burden water behind the impeller to the inlet side, so that the working pressure on both sides of the impeller is in phase. This kind of method is simple in structure, but it cannot completely balance the axial thrust. The residual axial thrust must be borne by professionally installed thrust rolling bearings.
vacuum unit of vacuum pressure impregnation equipment of start and stop sequence

Fluoroplastic magnetic pump is different from self-priming or stainless steel magnetic pump. It is composed of pump, magnetic driver and motor. The magnetic drive of the key components is composed of an outer magnetic rotor, an inner magnetic rotor and a partition without magnetic permeability. Its application can well solve the problems of "running, emitting, dripping, leaking" and eliminate many potential safety hazards of seal leakage. Its flow passage parts are made of fluoroplastics and high-purity industrial ceramics, which have excellent corrosion resistance and sealing performance.

Advantages of using fluoroplastic magnetic pump:

1. No leakage: unlike the traditional centrifugal pump, the shaft seal structure is separated by a back cover with strong corrosion resistance between the driving magnet and the passive magnet, which can avoid leakage, pollution, corrosion and other problems.

2. Corrosion resistance: the pump head is made of European raw materials, which has strong corrosion resistance. Two pump body materials, cfrpp and PVDF, can be selected according to the delivered liquid. The material of pump shaft includes ceramics and SiC, among which ceramics can be used for general low corrosive liquids, and SiC can withstand high corrosive liquids.

3. Strong durability: use pump flow design software to calculate the optimal channel geometry, minimize fluid loss and improve the efficiency of blade exchange force.

4. Easy assembly: the internal parts of the pump are standardized, the assembly is simple, and the disassembly, inspection and maintenance are very simple, which is convenient and time-saving.

Precautions for use:

1. Prevent particle intrusion

(1) Do not design the magnetic moment smaller.

(2) It shall operate at the specified temperature. The medium temperature is strictly prohibited to be too high. Platinum resistance temperature sensor can be set on the outer surface of the magnetic pump diaphragm to detect the temperature rise in the annulus area, and alarm or stop when the temperature exceeds.

2. It cannot be used in systems with pressure

(1) Ferromagnetic impurities and particles shall not enter the magnetic drive and bearing friction pair.

(2) After transporting the medium that is easy to crystallize or precipitate, clean it in time (after stopping the pump, inject clean water into the pump room and drain it after running for 1min), so as to ensure the service life of the sliding bearing.

(3) When transporting the medium containing solid particles, it should be filtered at the inlet of the pump flow pipe.

3. Prevent dry friction

(1) Idling is strictly prohibited.

(2) Do not exhaust the medium.

(3) When the outlet valve is closed, the continuous operation time of the pump shall not exceed 2min to avoid overheating failure of the magnetic actuator.
How to reduce the oil return rate of vacuum unit?

Cavitation erosion, sediment wear and their combined action are the important reasons for the damage of all kinds of pumps at present. Through experimental and numerical simulation research, it is found that the mechanism of cavitation erosion, wear and their combined action is the basis for developing the optimal design method of fluid machinery and improving the ability of fluid machinery to resist cavitation erosion, sediment wear and damage. Since the factors that affect cavitation erosion, sediment wear and their combined action behavior include not only flow field parameters such as velocity and pressure, but also sand particle and material properties, since the 1970s, the research in this field has been carried out and made progress in the aspects of cavitation erosion, wear and combined action mechanism, the interaction between various factors, as well as the anti-wear materials of pumps to improve wear resistance.

The protection of sediment abrasion of wear-resistant pumps is also based on the successful countermeasures selected after studying the causes. In turn, it provides theoretical support for the study of the mechanism of the rapid destruction of the flow surface of hydraulic machinery.

In terms of the classification of wear, the commonly used classification is adhesive wear, abrasive wear (abrasive wear), friction oxidation and fatigue wear. Wear resistant water pumps and turbines should be subject to abrasive wear if they work in sandy rivers. According to Lorentz's opinion, abrasive wear can be divided into three categories: consolidated abrasive, semi consolidated abrasive and free abrasive. Consolidated abrasive particles such as sandpaper, grinding wheel, file, etc. The abrasive particles are fixed on the surface of a material and cannot be moved. The result of wear is that the abrasive particles are ground, fallen off and damaged. Semi consolidated abrasive particles are not fixed, so the abrasive particles can slide and roll, but the degree of freedom is still small. For example, the bulldozer's shoveling and ploughing in piles of sediment belong to this kind of wear. Free abrasive particles, such as air flow or water flow, carry out contact or relative movement on the ground object, and furrows appear on the ground object. When the abrasive particles are fine, they can also grind the ground object smooth. At this time, the movement of abrasive particles has greater freedom. It can roll, slide, jump, etc. freely. The results of long-time wear are wavy and grooved. The sediment wear of wear-resistant pumps and turbines and the wear of wind and sand on fan blades during wind power generation belong to a type of free abrasive wear.

The surface damage of flow passage components seen by pumps and turbines working in clear water medium is called cavitation erosion. When bubbles in water burst in the high-pressure area, thousands of atmospheric pressures can be generated. When bubbles burst on the metal surface, they will have an impact on the metal, which is the basic consensus on cavitation erosion at present. In addition to cavitation erosion, there is also sediment abrasion on the surface of water pump and turbine flow passage parts working in sediment laden water flow. This kind of cavitation erosion and abrasion that exist at the same time is called sediment abrasion (combined action of abrasion and cavitation erosion). Wear and cavitation are caused by two distinct mechanisms, which are on the material surface of flow passage parts; There are also obvious differences in the characteristics of damage. In the test of muddy water tunnel, the submicroscopic observation of various parts of the specimen around the fluid can clearly show the differences between them and the changes of interaction and alternation.
prevent water ring vacuum pump unit from being corroded to methods

Only when the shield pump is operated correctly and reasonably can the service life of the shield pump be prolonged! In the process of use, the use of pipeline shielded pump is particularly important!

First, exhaust (before and after separating the pump)

Before starting the pump: open the inlet valve (record the reading of the outlet pressure gauge) - open the outlet valve - open the reverse circulation pipeline valve (R type) - connect the cooling water (if any)

After starting the pump: open the inlet valve - start the pump - open the outlet valve - open the reverse circulation pipeline valve (R type)

Then, operate continuously and normally: after the air is discharged and the pressure gauge is stable, adjust the outlet valve until the pressure gauge indicates the allowable pressure range of the pump, and the operating current is normal (it should be about 80% of the rated current), and then operate continuously.

[the reading of the pump outlet pressure gauge = the pump inlet pressure + the pressure that the pump can increase

Then, stop the pump: close the outlet valve first, and then turn off the power.

Finally, the judgment of positive and negative pump:

Pump forward rotation:

Jog the power supply, and the pointer of TRG meter will return to zero after slightly swinging in the green area;

The outlet pressure gauge can reach the normal pressure;

The pump has no vibration and noise;

The running current of the pump is normal.

Pump reverse:

Jog the power supply, and the pointer of TRG meter swings to the red zone;

The outlet pressure gauge can not reach the normal pressure;

The pump has abnormal vibration and high noise;

The running current of the pump is lower than the normal value.
What are the advantages of dental vacuum unit?

What is the idling of centrifugal pump? It usually refers to the situation that there is no water or more air in the pump shell when the pump is running. The majority of users are "pale at the talk" about the idling of the centrifugal pump because they do not understand the causes of the idling phenomenon and how to solve it. In fact, the centrifugal pump will not cause damage in a very short period of idling (within 1 minute).

The reasons for the centrifugal pump idling are: the inlet medium of the pump is insufficient or the water inlet pressure is insufficient, or the water inlet pipe of the pump is blocked, or the air in the pump cavity is not exhausted. When the centrifugal pump is idling, the impeller has no or little contact with the medium, so it is unable to work effectively, and the liquid cannot be delivered normally. All these are useless work. As there is no effective work, the load on the motor is very small, and the current generated is also very small, so there will be no impact on the motor. The impact of pump idling on the pump is indeed fatal.

What are the hazards of centrifugal pump idling? The idle water pump is easy to cavitate, causing damage to the pump body and flow passage parts; Idling pump mechanical seal or packing seal will not get liquid lubrication, resulting in dry grinding and rapid damage; The idling pump rotor parts and pump experience heat without liquid cooling, and those narrow gap positions (such as sealing ring) are easy to bite due to the effect of thermal expansion and cold contraction; The balance disc of the idling multi-stage centrifugal pump is not lubricated, and the balance disc will soon be burned and damaged. Therefore, measures must be taken to prevent the pump from idling.
What Are The Advantages Of Vacuum Units In Pet Applications?

Liquid ring vacuum pump

Functions of different parts of centrifugal pump

Today, I will analyze the functions of various components of the centrifugal pump.

1. the impeller of centrifugal pump is the core part, which has the function of high speed and large output force;

2. the pump body is used to connect with the bracket for installing the bearing to support and fix;

3. the pump shaft is used to transmit the torque of the motor to the impeller and has the function of transmitting mechanical energy;

4. sealing ring is also known as leakage reducing ring;

5. the stuffing box is used to maintain the vacuum in the centrifugal pump, so as to prevent the water in the pump from flowing out and the water outside from flowing in.

6. the axial force balancing device is used to maintain the axial force balance of the centrifugal pump.

Do you understand the above? If you have any questions, follow us and leave us a message.
What are the precautions and features of medical vacuum unit selection?

When the centrifugal pump is blocked by waste, it will be necessary to pull the pump up to sort it out, which is very inconvenient, so it is rarely used in practical activities. Therefore, the underwater pump is used to carry out low-level transportation, which solves the problem of low-level transportation.

However, due to the selection of short shaft, the unbalanced axial force of centrifugal impeller and the suspended wall structure of all shafts, great stiffness is caused at the end of centrifugal impeller during turnover. The longer the shaft, the greater the stiffness. In order to solve this problem, bearings are installed on the shaft. However, because the whole shaft is a flexible shaft, the bearing is continuously damaged on one side, with a high wear rate, strong bearing shaking and accelerated damage rate. Therefore, the damage frequency of the submerged pump is high. And the shaft is not suitable to be too long, generally within 2 meters. The bearing of the submerged pump is water-cooled and smooth with the help of the medium transported by the pump. If the medium of underwater concrete does not freeze and clean the bearing (such a thing will happen when the pump is empty and the inlet is blocked by dirt), it will burn the tile or even the motor.

The repair equipment of submerged pump is very laborious. When transporting corrosive media, it is impossible to complete without lifting items. When the centrifugal water pump is transporting liquid, when the liquid level gauge is less than, it is required to fill the pump to produce water. Therefore, the pump bottom valve shall be installed at the pump inlet. As time goes on, the bottom valve of the water pump is corroded or stuck, so it is required to exchange or repair, so the application is very inconvenient. Submersible pumps are generally used to transport cold water and rivers, but when they are used to transport corrosive liquids such as strong acid and alkali, they are prone to motor erosion and power failure, which is very unsafe. After all, the submerged pump solves the problem of low-level transportation, but it also produces a lot of difficulties in application. The column type self suction pump is specially designed for low-level liquid transportation for the defects of the submerged pump. It can replace the long axis underwater pump on the road, and the height width ratio of natural suction reaches 8m. It can be used as the bottom pump and cabin cleaning pump in the ship.
oil diffusion pump of heater and heating power

1、 Installation of vertical pipeline centrifugal pump

1. Service conditions: water temperature ≤ 60 ℃, liquid pH value 4 ~ 10. ① The unique single leaf or double impeller centrifugal impeller structure is selected, which further improves the waste passing capacity, and can reasonably and effectively control the solid particles with the diameter of about 50% of the pump specification according to the chemical fiber chemicals 5 times of the pump specification.

2. New hard corrosion-resistant cobalt alloy raw materials are selected for the machine seal. At the same time, the sealing performance is improved to double face sealing, so that it can operate in the oil room for a long time, and the pump can operate safely for more than 8000h.

3. The overall structure is compact, small in size, low in noise, remarkable in environmental protection and energy conservation, and convenient in maintenance. It can work by diving into the water without building a water pump house, greatly reducing the project budget.

4. The pump sealing oil room is equipped with a high-precision anti-interference pipeline leakage detection sensor, and thermistor components are reserved in the stator winding to protect the pump motor.

5. The automatic safety protection control box can be selected according to the customer's need to maintain the water seepage, power flow, load and overheating of the vertical pipeline centrifugal pump, which improves the stability and reliability of the goods. 6. The cable float switch can automatically control the start and termination of the system pump according to the needs, without the care of full-time personnel, and the application is very convenient.

6. The double slide rail full-automatic coupling installation system software can be configured according to the customer's requirements, which makes installation and maintenance convenient, and people do not need to enter the waste water pit.

7. It can be applied within the full pump head range to ensure that the motor is not easy to load.

8. There are two different installation methods: fixed automatic coupling installation system software, and mobile random installation system software.

2、 Installation regulations for vertical pipeline centrifugal pump

The technical focus of the installation is to specify the installation height of the pipeline sewage pump, that is, the suction lift. This height refers to the safe distance from the water resource river surface to the centrifugal pump impeller axis, which cannot be confused with the allowable suction vacuum pump height. The allowable suction vacuum pump height marked on the pump product manual or nameplate refers to the vacuum pump value on the cross-section of the water inlet pipe of the pump, and is measured through experiments under 1 standard atmospheric pressure and 20 ℃ water temperature. It does not take into account the water flow after the supporting facilities of the suction pipeline. The installation height of the water pump should be the remaining standard value after the allowable suction height of the vacuum pump is deducted from the pump head lost by the suction pipeline. It should get rid of the specific landform suction height. The installation height of the water pump shall not exceed the measured value, otherwise, the centrifugal water pump may not be able to pump water.
How to prevent the formation of particles in the cavity of screw vacuum pump

Design of acid resistant pump

[answer] acid resistant pump is a kind of machine that can lift liquid, transport liquid or increase the pressure of liquid, that is, turn the original mechanical energy into liquid energy. The acid resistant pump is a pump developed and produced by using acid resistant materials on the basis of the pump. The main reason why most acid resistant pumps can resist acid is the material of the pump. Generally, acid resistant pumps use non-metallic materials as the flow passage component materials of the pump, such as "polyethylene, polypropylene, polyfluoroethylene propylene, etc." among them, polyfluoroethylene propylene is one of the best acid resistant materials, which can basically resist the corrosion of any acid medium, and is called the king of plastics.

The acid resistant pump product is suitable for transporting various corrosive media under the temperature of -20 ℃ ~ +120 ℃. Its overflow part is all made of plastic alloy (polytetrafluoroethylene, perfluoroethylene propylene and other materials) through reasonable formulation, molding and processing. The acid resistant pump integrates the advantages of a variety of plastics, has strong corrosion resistance, and has the advantages of high mechanical strength, no aging, no toxin decomposition, etc., and is used to transport various strong Ideal equipment for weak acid.

For a long time, the selection of acid resistant pump has been one of the most headache problems for chemical industry practitioners. A little carelessness may damage the equipment, or cause accidents or even disasters. According to relevant statistics, about 60% of the damage of chemical equipment is caused by corrosion. Therefore, when selecting chemical pumps, we should first pay attention to the scientificity of material selection. There is usually a misunderstanding that stainless steel is a "universal material". It is very dangerous to hold stainless steel regardless of medium and environmental conditions. Therefore, it is necessary for factory operation and chemical production to reasonably select acid resistant materials.

In the future, with the rapid development of science and technology, acid resistant pumps will play a more and more important role in chemical, metallurgical, electric power, papermaking, food, pharmaceutical, synthetic fiber and other industries. At the same time, there will be higher requirements for pump equipment. And the design requirements are more reasonable, the structure is simple, and the use is convenient. It will have good application and development prospects in the future.
Helium leak detector used in vacuum coating machine leak detection

What is the reason why the centrifugal pump can not meet the flow and head requirements?

1. air leakage of centrifugal pump or suction pipe;

2. the suction pipeline or centrifugal pump inlet is blocked, and the suction resistance is too large;

3. the wear clearance of impeller ring is too large;

4. the impeller is blocked or severely worn and corroded;

5. the rotation direction of the centrifugal pump is wrong or the impeller is installed reversely;

6. the outlet valve of the centrifugal pump is not opened or cannot be opened;

7. the motor speed is not allowed;

8. the selection or function of centrifugal pump is inconsistent.

Treatment method:

1. check and clean the suction valve and pipeline;

2. remove impeller blockage or replace impeller;

3. replace the impeller sealing ring;

4. check and eliminate air leakage;

5. open the outlet valve of the pump and adjust the valve opening;

6. adjust the rotation direction of the pump;

7. increase the motor speed;

8. check whether the functional parameters of the pump meet the working conditions and adjust them.
Roots vacuum unit of Technical specifications

Advantages and disadvantages of vertical pipeline centrifugal pump

advantage:

1. Small size and small floor space.

2. Simple structure, few parts and easy maintenance.

3. The flow and pressure are stable, and the vibration is small when the pump operates normally.

Disadvantages:

1. The efficiency of the pump is low when it is operated at a small flow below the rated flow.

2. It is suitable for conveying various liquids with low viscosity. The viscosity of the liquid has a great impact on the performance of the pump.

3. Poor self suction capacity and easy evacuation. If the dynamic liquid level of the pumped liquid is below the center line of the pump, it must be filled or evacuated before starting the pump, otherwise the centrifugal pump cannot work normally.

Although the vertical pipeline centrifugal pump can now meet the basic use requirements, we should also see its shortcomings. We also need to increase research and development efforts to ensure that it can be more efficient, safe and fast in the transportation process.
Why the dry screw vacuum pump has fatigue damage

Understanding of the characteristics and type selection of gear pump

Gear pump features

1. The gear oil pump is suitable for conveying various oils, such as heavy oil, diesel oil, lubricating oil. It can be equipped with copper gears to convey low-grade liquids, such as gasoline, benzene, etc. the unit also produces stainless steel gear pumps to convey beverages and corrosive liquids.

2. The pump is not suitable for those containing hard particles or fibers. The applicable viscosity is 5*10-5~1.5*103m2/s, and the temperature is not higher than 70° C； If you need to transport high temperature liquid, please use gear pump.

2、 Principle

This type of pump is equipped with a pair of rotary gears in the pump body, one active and one passive. The whole working chamber in the pump is divided into two independent parts, suction chamber and discharge chamber, depending on the mutual meshing of the two gears; When the pump is running, the driving gear drives the driven gear to rotate. When the gear is meshed to disengaged, a local vacuum is formed on the suction side, and the liquid is sucked in. The sucked liquid fills each tooth valley of the gear and is brought to the discharge side. When the gear enters the meshing, the liquid is extruded to form a high-pressure liquid and discharged out of the pump through the discharge port of the pump.
Roots-Piston Vacuum System Used in Magnesium Smelting Industry

These are the external factors that affect the mechanical seal of self-priming centrifugal pump!

External factors affecting the mechanical seal of self-priming centrifugal pump are as follows:

1. The deflection of the pump shaft is too large - when the shaft is bent and deformed, the linear displacement of the cross-section centroid in the direction perpendicular to the axis is called deflection, and the mechanical seal requires a uniform force between the two seal faces. However, due to the unreasonable planning of self-priming centrifugal pump products, the deflection at the mechanical seal device is too large, resulting in uneven force at the seal, which will cause the self-priming centrifugal pump to lose its sealing function.

2. Too large vibration - the large vibration of the mechanical seal is often not caused by the mechanical seal itself, but by the unreasonable design of the pump shaft, poor machining accuracy, large rear wheel parallelism, large radial force, etc. So we should set the time, strictly check and eliminate the oscillation source.

3. There is no auxiliary scouring system or the planning of auxiliary scouring system is unreasonable - the auxiliary scouring system of mechanical seal is very important. It can effectively protect the sealing surface and play the role of cooling, smoothing and flushing sundries. Sometimes the planner's plan is unreasonable, and the sealing effect cannot be achieved. Some plan auxiliary systems, but because there are impurities in the flushing fluid, flushing. The brush fluid flow is large, the pressure is not good, and the brush position planning is unreasonable, which also can not achieve the effect.

4. Axial displacement of pump shaft - the specific pressure of mechanical seal surface achieves the purpose of sealing, and the sealing degree at both ends can be adjusted through bandage spring. In order to ensure this specific pressure, the pump shaft does not need to have too many grooves.

The above are the external factors that affect the mechanical seal of self-priming centrifugal pump. I hope it can help you.
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]Dry vacuum pump solution for hemodialysis tubes of medical devices[/url]

Precautions for disassembly of centrifugal pump

Centrifugal pump is an indispensable facility in the production process. During the production and operation process, it is inevitable that the centrifugal pump needs to be disassembled due to overhaul, maintenance and other reasons. Here are some matters needing attention in the disassembly process.

Safety requirements for disassembly of centrifugal pump;

1. implement safety measures for the work ticket (the fitter workshop implements the system of "six exits, one no contact and one review&quot.

2. before disassembling the main pump, check whether the tools and lifting machinery (e.g. down chain, overhead crane and steel wire rope) are in good condition.

Basic conditions for disassembly of centrifugal pump:

Familiar with the structure, especially for complex pumps or new pumps. Before disassembly, the drawings or instructions must be checked to understand the function, relationship and rotation direction of each component, so as to avoid blind disassembly.

Mark them to avoid misalignment. Before disassembly, adjacent parts or coupling parts must be marked to avoid vibration caused by incorrect or uneven reassembly quality (such as multiple keys on the shaft, couplings, etc.). When marking, mark on the non working surface.

Before maintenance, carefully measure and record the data. Such as alignment data of pump and motor.

The disassembly sequence is reasonable. First remove the auxiliary parts of the pump (auxiliary pipes, circulating cooling water system, couplings, etc.), then remove the main engine, remove the outside first, then the inside, remove the upper part first, and then the lower part. Please select appropriate tools before disassembly, and design and make special tools if necessary. Do not knock during disassembly. Protect all threads, mating surfaces and top holes of the shaft.

The parts shall be neatly arranged to facilitate assembly.

Disassembly sequence of centrifugal pump:

1. remove the fixing bolts of the coupling guard, and then remove the coupling guard.

2. make a mark on the coupling (the old pump shall be marked again), and measure the alignment data of the pump and motor.

3. remove the connecting bolts.

4. remove the cooling water pipe.

5. remove the mechanical seal gland bolts, and then release the remaining liquid in the seal.

6. drain the lubricant from the bearing housing.

7. Remove the connecting bolts between the pump cover and the pump housing.

8. lift the pump body.

9. remove the impeller back cover and impeller.

10. remove the bolts connecting the pump suspension and pump cover, and then remove the pump cover.

11. remove the pump side coupling.

12. loosen the front seal ring and rear seal ring of the pump bearing housing.

13. remove the pump bearing housing (install the impeller back cover before disassembly to avoid damaging the threads of the shaft head.)

14. remove the bearing back cover, remove the bearing, and then remove the bearing gland.

15. remove the sealed shaft sleeve. And the movable ring is on the sleeve.

16. check and clean all parts, and prepare the parts and materials to be replaced.
Count the emergency shutdown of vacuum unit

Liquid ring vacuum pump

What's the point of choosing a sewage pump?
Hello everyone, today I want to give you the knowledge of what to pay attention to when choosing a sewage pump.

1. Generally, it is necessary to clarify the use environment of the sewage pump to correctly select the type of sewage pump.

2. It is necessary to understand clearly with the user the required lift of the sewage pump.

3. It is necessary to calculate the wear of pipeline elbows, pipeline friction, etc.

4. The lift selected for the sewage pump should be within the rated lift range to ensure that the motor will not be overloaded.

5. The pipeline of the sewage pump should be kept clear to avoid the overload of the motor due to the blockage of the pipeline.
The above editor said that we need to pay attention when choosing a sewage pump, and I hope it will help you.
Choosing The Appropriate Dry Screw Vacuum Pump Can Not Avoid These Three Points

Liquid ring vacuum pump

What is an outdoor rain proof centrifugal pump?

For the centrifugal pump installed in the open air, the outdoor centrifugal pump shall be selected when purchasing, otherwise the motor of the centrifugal pump will be burned due to the rain. In fact, the rain proof centrifugal pump mainly means that the motor can meet the demand if it is rain proof. The pump body has no electrical components and is made of metal materials, so the pump body does not need to take rain proof measures. The commonly used outdoor centrifugal pump uses a vertical pipe centrifugal pump to add a rain cover to the fan cover of the ordinary motor. If the horizontal rain proof centrifugal pump is required, it can only use an explosion-proof motor to add a rain cover on the basis of the waterproof function of the explosion-proof motor.

Outdoor centrifugal pump application:

1. The outdoor centrifugal pump can be used as a domestic water supply for fire fighting, and can also be installed on the top floor as a hot water circulating pump.

2. The outdoor centrifugal pump is equipped with explosion-proof motor and copper impeller, which can also be installed in the oil depot as an oil pump.

3. The outdoor centrifugal pump is made of stainless steel and can also transport all kinds of corrosive chemical liquids.

4. Outdoor centrifugal pump can also be used as farmland irrigation pump.
Vacuum leak detection

Installation analysis and pithy formula of acid resistant pump chemical pump pipeline

When users install acid resistant pumps, magnetic pumps, centrifugal pumps and chemical pumps, pipelines are indispensable. During the installation, transformation and maintenance of equipment pipelines, they often deal with the installation and transformation of pipelines. What are the quick and effective ways to install pipelines,

When users install acid resistant pumps, magnetic pumps, centrifugal pumps and chemical pumps, pipelines are indispensable. During the installation, transformation and maintenance of equipment pipelines, they often deal with the installation and transformation of pipelines. When installing pipelines, what are the quick and important points and what are the main matters? Here are the pithy formulas for pipeline installation and analysis;

Pithy formula for pipe installation

I will install the pipes in the workshop. The basic principles should not be forgotten.

The main pipe should be straight rather than curved, and the piping should be short rather than long,

If you can be rough, you can choose the small. You can live forever.

No matter high temperature or high cold, it must be compensated within 50 meters.

Measure more, draw more and calculate more. Cut materials accurately. Don't panic.

Less gas cutting and more knives, high durability and quality of pipeline.

The welded junction flanges are distributed skillfully, and the inflection points are encountered for careful consideration.

Ask more questions and look at the pictures. Don't hide your congenital defects.

The implementation standards shall be rigorous and the safety and quality shall be guaranteed.

It's difficult to repair the leak point with one whip of explosion-proof pipeline.

No hot work or welding is allowed, and the flange shall be cut and replaced as soon as possible.

With meticulous efforts, the project will be free from hidden dangers.

Early detection of defects and timely correction to ensure safety.

Analysis 1: "the main pipe should be straight rather than curved, the piping should be short rather than long, the coarse should be the coarse and the small should be selected, and it can survive for more than 50 meters, regardless of high temperature or high cold, it must be compensated within 50 meters". This is the principle to be followed in the pipeline layout design. The "surviving for more than 50 meters" means that the pipeline connection method should use more flanges to reserve flexible joints, and less blind joints to be welded; A pair of flanges must be installed every certain distance in the pipeline connection to ensure that any section of pipeline can be flexibly disassembled.

2: "Less gas cutting and more knives, high durability and quality of pipeline" means that when the pipeline needs to be cut off, do not use gas cutting if you can use a cutting machine, and do not use a cutting machine if you can use a pipe cutting knife. Because the internal structure of the pipe will be damaged every time it passes through high temperature, the high temperature of gas cutting is different from that of electric welding. Therefore, we must remember to "use less gas cutting and more knives to ensure high durability and quality of the pipeline" when installing the pipeline.

3: "Ask more and look at the drawings, and don't hide congenital defects" means that you must ask more and look at the drawings before receiving the drawings for installation, so as to avoid enlarging the defects in the design to the workshop. Some design drawings are made by technicians working overtime, and defects are inevitable. Therefore, it is necessary to ask more questions and read more drawings; In case of obvious violation of chemical principles, it shall be raised in time to avoid congenital defects after installation, or even irreparable losses during production and operation. On this issue, don't superstitious about "technical authority" and "famous schools and institutes". The safety of employees and the interests of the enterprise are above everything else, and the "face" of anyone is insignificant; Once the explosion-proof workshop has congenital defects, it will pay a high price.

4: "The explosion-proof pipeline is a whip. It is really difficult to repair the leakage point. You can't use hot work and welding. Cut and replace the flange as soon as possible", which is a problem often encountered by many enterprises in the pipeline installation. The whole explosion-proof pipeline is welded from the raw material tank to the high-level groove, and the middle is the same dead end welding, instead of a flange. This installation method has great potential safety hazards. When a certain section of the explosion-proof pipeline leaks during use, a whip type welding connection will bring unpredictable risks to the repair of the leakage point. In the face of small leakage points, neither hot work nor welding is allowed. Therefore, cut and flange as early as possible.
What Is Purging And Sewage Drainage Of Dry Screw Vacuum Pump?
Liquid ring vacuum pump
Liquid ring vacuum pump manufacturer

How to deal with the blockage of sewage pump

How to deal with the blockage of sewage pump? Cold water shall be used to clean with solvent. If the blockage is serious, the human resources shall be transmitted after the pump body is disassembled and assembled. Frequent pump disassembly will accelerate the damage of relevant components of the pump mouth ring. Therefore, it is necessary to avoid blockage as much as possible. During the operation, the following common problems can be used to reduce the blockage of the sewage pump.

After knowing how to deal with the blockage of the sewage pump, it is very necessary for the operators of machinery and equipment to apply appropriate maintenance methods to reduce the probability of blockage of machinery and equipment. As long as it is a sewage pump with qualified quality, there is very little blockage when solving the waste water matching the specifications. The blockage is usually caused by the untimely daily maintenance. For example, if the pump is not cleaned immediately after the waste water with high liposuction viscosity, the material will inevitably solidify over a long period of time, causing the centrifugal impeller of the pump to be stuck and blocked.

In order to better reduce this situation, the customer must formulate a timely maintenance and repair plan according to the application of well-known brands of sewage pumps, so as to lubricate the grease on time and ensure the actual lubrication effect of machinery and equipment. At the same time, the customer must inspect the internal spare parts such as gear rack, centrifugal impeller, rolling bearing, piston rod, etc., immediately replace the brittle or severely damaged parts, and clean up the hydraulic machine. In addition, before the sewage pump is used and placed for a long time, it must be operated in the sewage well for several minutes to achieve the actual effect of high-pressure cleaning of the pump chamber.

On the whole, the operators should be more concerned about how to deal with the problem of sewage pump blockage. It is generally proposed to assign full-time personnel to supervise and manage the sewage pump in the whole process, and regularly maintain the winding resistance of the submersible pump and the grounding resistance in the middle of the shell. Every 400 hours, the automobile oil in the grooves is removed and replaced up and down, especially the value traceability of the sealing ring between the centrifugal impeller and the pump housing. If it is a deep submersible sewage pump, it must be removed from the water in the future when it is not easy to reuse, so as to reduce the opportunity of motor rotor winding resistance and moisture return.

After the detailed introduction of the above contents, it is believed that you also have a detailed understanding of how to deal with the blockage of the sewage pump. It is only necessary to select the sewage pump with matching characteristics according to the specific working conditions and transported substances, and the blockage is very rare
Teach you how to solve the burning of screw vacuum pump
Liquid ring vacuum pump
Liquid ring vacuum pump manufacturer

Present situation of centrifugal pump performance test

At present, the main problems existing in the operation and actual production of centrifugal pumps and pump stations are as follows:

1. In most cases, the actual working condition of the centrifugal pump in the pump station often deviates from its design working condition, which reduces the operating efficiency.

2. In most of the centrifugal pump stations in China, especially those with large water level variation, the pump stations often operate under low efficiency conditions, resulting in a large waste of energy.

3. Some large flow centrifugal pumps can not be tested in the laboratory.

In order to meet the requirements of water use and the purpose of economic operation, it is often necessary to change the flow and head to change its working point. The internal flow analysis of turbomachinery has always been a hot research issue. Due to the Coriolis force and centrifugal force caused by the rotation and surface curvature of the impeller, the flow in the impeller is quite complex, and often accompanied by flow separation and wake flow. So far, we have not seen a satisfactory centrifugal pump designed by fully applying the three-dimensional theory.

For a long time, pump manufacturers have generally adopted the following procedures for the development of new pumps: first design several impellers and pump casings, then establish models, and finally go to the test bench. Through modification, design, and retesting, the procedures can meet the requirements of users. In this way, the characteristic curve of the pump can be estimated according to the hydraulic parameters such as the designed pump impeller and volute (guide vane). Obviously, it can reduce the cost of model making, trial production and test of the pump, and shorten the design and manufacturing cycle, which is of great practical significance.

Several important research directions in pump technology at present:

1. Performance study. 2. Operation and fault diagnosis. 3. Cavitation study. 4. Design and product development. 5、CFD。

Pump design, product development and performance research are endless research directions and hot spots in pump products. The research in these two aspects not only belongs to the field of applied research, but also can enrich the basic theory and technology of pumps, making it easier to produce results.
EVP Liquid Ring-Roots Vacuum Pump Unit in Titanium Catalyst Unit of DPC PC Factory of Application

What kind of pump is selected for lime gypsum desulfurization pump

In the power plant chemical industry, the desulfurization and denitration system is favored. Gypsum desulfurization is a common kind of wet desulfurization. Scope of application: it is suitable for large enterprises to carry out flue gas desulfurization. The lime lime gypsum method is applicable to a wide range of coals, with high desulfurization efficiency, high absorbent utilization rate (can be greater than 90%), high equipment operation rate (up to 90%), high working reliability (currently mature flue gas desulfurization process), and rich sources of desulfurizer limestone,

Advantages, disadvantages, technological process of lime gypsum method and what type of slurry pump is used?

The corrosion-resistant and wear-resistant slurry pump produced by Wanjin and the corrosion-resistant and particle resistant plywood pump are made of external cast steel lined with corrosion-resistant and wear-resistant materials, which have a good anti-corrosion effect on the corrosion of chloride ions in the medium. At the same time, the wear resistance is completely suitable for the transmission of lime slurry. Let's take a look at the introduction of desulfurization and denitration;

Desulfurization principle: limestone or lime is used as desulfurization absorbent. Limestone is crushed and ground into powder and mixed with water to form absorption slurry. When lime is used as absorbent, lime powder is digested and added with water to make absorbent slurry. When the absorption liquid is atomized and sprayed into flue gas through nozzle, the absorption liquid is dispersed into small droplets and covers the entire section of the absorption tower. These droplets are absorbed by SO2 when they are in countercurrent contact with flue gas. In this way, SO2 is absorbed in the absorption area, and the oxidation and neutralization reaction of the absorbent is completed in the liquid storage area at the bottom of the absorption tower to form gypsum.

First, advantages: high desulfurization efficiency (desulfurization rate is up to 95%); Single machine can handle large amount of flue gas, which can be matched with large boilers; The technology is mature and the operation reliability is good (the operation rate of this desulfurization device in foreign thermal power plants can generally reach more than 98%); It has strong adaptability to the change of coal type (whether it is high sulfur coal with sulfur content greater than 3% or low sulfur coal with sulfur content less than 1%, the desulfurization process can adapt to it), especially high sulfur coal; Abundant absorbent resources and low price; Desulfurization by-products are convenient for comprehensive utilization; The technology is updated rapidly.

Let's look at the disadvantages: the initial investment cost is too high, the operation cost is high, the process flow is complex, the floor area is large, the one-time construction investment is relatively large, the system management operation is complex, the wear and corrosion phenomenon is serious, the by-product gypsum can be exported, and the industrial wastewater is difficult to treat.

What are the general devices?

The desulfurization process consists of absorbent preparation system, flue gas absorption and oxidation system, desulfurization by-products, desulfurization wastewater treatment system, flue gas system automation, gypsum treatment system, wastewater system, control electrical system and online monitoring system.
vacuum flash distillation of introduction

Precautions for operation and maintenance of chemical centrifugal pump

1、 Maintenance of chemical centrifugal pump in operation

1. the water pipeline must be highly sealed.

2. long term operation of the pump under cavitation condition is prohibited.

3. it is forbidden to operate the motor for a long time with overcurrent when the pump is running at flow.

4. regularly check that the motor runs over current for a long time when the pump is running.

5. the pump shall be watched by a specially assigned person during operation to avoid accidents.

6. oil the bearing every 500 hours of pump operation. Motor power greater than 11kw is equipped with oil filling device, which can be directly injected with high-pressure oil gun to ensure excellent bearing lubrication.

7. after long-term operation of the pump, if the noise and vibration of the unit are increased due to mechanical wear, the pump shall be stopped for inspection. If necessary, the vulnerable parts and bearings can be replaced. The overhaul period of the unit is generally one year.

2、 Maintenance of chemical centrifugal pump mechanical seal

1. mechanical seal lubrication shall be clean and free of solid particles.

2. it is strictly prohibited to work the mechanical seal under the condition of dry grinding.

3. before starting, turn the pump (motor) for several circles to prevent the seal ring from being broken and damaged due to sudden starting.
Liquid Ring Vacuum Pump in Vacuum Consolidation
Liquid ring vacuum pump
Liquid ring vacuum pump manufacturer

Reasons for demagnetization of magnetic steel of magnetic pump

During the use of the magnetic drive pump, some users responded that the magnetic steel was demagnetized, resulting in the pump unable to operate normally. Therefore, it is considered to be the quality problem of the magnetic steel delivered by the company. However, after many after-sales analysis, we found that users had some problems in the early design or later use, resulting in demagnetization of magnetic steel. Therefore, in order to reduce the use cost of users and avoid unnecessary losses, let's talk about several major reasons for demagnetization of magnetic steel today.

1. The use temperature is unreasonable. The temperature of the material conveyed by the pump is too high, exceeding the allowable service temperature of the magnetic material. For example, for the pump with Nd-Fe-B magnetic steel, the service temperature should be less than 150 ℃. If the system temperature exceeds 150 ℃, the magnetic steel will be demagnetized soon.

2. Long time low lift operation. For example, if the flow at the rated point is 25 m3 / h and the head is 50 m, if it deviates from the rated point (for example, the head is only more than 10 meters), the return pressure inside the pump will drop, the circulation will be blocked, the eddy current belt of the metal isolation sleeve will not go, its temperature will rise sharply, and the magnetic steel will demagnetize.

3. Pipeline matching is unreasonable. For example, DN65 pipeline is required at the inlet. If the pipeline is less than 65mm, the flow will be in short supply, which will easily lead to poor internal circulation, heat is not easy to be taken away, and the system temperature exceeds the service temperature of magnetic steel.

4. The sliding bearing is worn and not replaced in time. If it is not replaced in time, there will be friction between the inner magnetic rotor and the inner wall of the isolation sleeve, resulting in the temperature rise of the isolation sleeve and demagnetization of the magnetic steel.

5. The magnetic pump runs idly. In this case, the temperature of the metal isolation sleeve and the inner magnetic rotor rises sharply, exceeding the service temperature of the magnetic steel, which will soon lead to demagnetization of the magnetic steel of the inner magnetic rotor.

6. The inlet and outlet pipelines of the pump are blocked. In this case, the magnetic pump idles, or the internal circulation of the pump is affected and the temperature rises; Moreover, the blockage of the outlet pipeline will also demagnetize the magnetic steel because the internal circulation of the pump cannot be carried out. If the pump inlet pipeline is equipped with a filter, the filter shall be cleaned regularly to ensure that the filtering area is within a reasonable range.

7. Abnormal jamming of rotor parts. The rotor component composed of internal magnet and impeller is stuck by mechanical impurities and cannot run, but the motor does not stop in time, which will lead to demagnetization of magnetic steel.

8. Cavitation. Cavitation of the pump due to various reasons will cause demagnetization of the magnetic steel.
Does the molecular pumps can be treated with anti-corrosion?Like nickel plating?

Safety protection method of submersible pump

Submersible pump is an important equipment for water extraction in deep wells. When in use, the whole unit works in the water and extracts the groundwater to the surface. It is used for domestic water, mine rescue, industrial cooling, farmland irrigation, seawater lifting, ship load regulation, and fountain landscape. Hot water submersible pump is used for bathing in hot springs. It can also be used to extract groundwater from deep wells. It can also be used in water lifting projects such as rivers, reservoirs and canals. It is mainly used for farmland irrigation and human and livestock water in alpine areas. It can also be used for central air conditioning cooling, heat pump unit, cold pump unit, city, factory, railway, mine and construction site drainage. The general flow can reach 5 ~ 650m3 / h and the lift can reach 10-550m. Submersible pumps often burn out motor windings due to lack of water in the pool. In view of this situation, we have sorted out several protection measures for submersible pump today: water shortage protection, motor water leakage protection, oil chamber water leakage protection, insulation resistance protection, winding overheating protection, bearing overheating protection, etc.

1. Abnormal power supply voltage is prohibited

Because the low-voltage power supply line is relatively long, it is common that the terminal voltage of the line is too low. When the phase voltage is lower than 198 V and the line voltage is lower than 342 V, the speed of the submersible pump motor decreases. When it does not reach 70% of the rated speed, the starting centrifugal switch will be closed, causing the starting winding to be energized for a long time, heating and even burning the winding and capacitor. On the contrary, too high voltage causes the motor to overheat and burn out the winding. Therefore, during the operation of submersible pump, the operator must observe the power supply voltage at any time. If it is less than 10% lower than the rated voltage and more than 10% higher than the rated voltage, stop the motor, find out the cause and eliminate the fault.

2. Confirm the correct rotation direction of the motor

The rotation direction of the motor should be clarified. Now there are many types of high head submersible pumps that can discharge water during forward rotation and reverse rotation, but the water output is small and the current is large during reverse rotation. If the reverse time is long, the motor winding will be damaged.

3. Insulation resistance requirements for cable installation and submersible pump

When installing the submersible pump, the cable should be overhead and the power line should not be too long. Do not force the cable when the submersible pump is launched or raised, so as to avoid breaking the power line. Do not sink into the mud when the submersible pump is working, otherwise it will cause poor heat dissipation of the motor and burn out the motor winding. During installation, the insulation resistance of the motor shall not be less than 0.5 megohm.

4. Avoid frequent switching

Do not switch on and off the submersible pump frequently, because the backflow will occur when the electric pump stops running. If it is started immediately, the motor load will start, resulting in excessive starting current and burning out the winding. Due to the large current during startup, frequent startup will also burn out the motor winding of submersible pump.
Vacuum pump used in Milking industry

What if the water output of single-stage centrifugal water pump equipment is insufficient

When using single-stage centrifugal water pump equipment, the water output is insufficient occasionally. Many people don't know the reason, so they can't find a solution

Due to the vortex generated in the pool and the air sucked into the pump body by the self-priming centrifugal pump, the water output of the pump is insufficient. In case of this phenomenon, the submerged depth of the inlet pipe can be increased, or other measures to prevent vortex can be taken.

The impeller leakage reducing ring of single-stage centrifugal pump is worn too much, resulting in insufficient water output of the pump. Only replace the leakage reducing ring or replace the impeller if necessary. Because the speed of the water pump is too low, for example, the speed of the water pump is required to be 2900r / min, while the motor speed of some users is only 1450r / min. for example, some users of common vertical centrifugal pump products use frequency conversion control. Because the frequency is adjusted too low, the water volume will be reduced accordingly. The solution is to make the water pump power machine reach the standard speed

Because there is air in the water inlet pipe of various pumps, the solution is to reinstall the water inlet pipe of the pump to make the water inlet pipe horizontal or inclined downward.

If the impeller of the water pump is seriously damaged due to cavitation or corrosion, use a new impeller or corrosion-resistant impeller. The opening of the bottom valve of the water pump is too small or the bottom valve, water pump and pipeline are blocked by sundries. At this time, check and eliminate them one by one

If the pump operates for a long time, it is likely that the pump flow will be reduced due to the excessive clearance of the mouth ring, but the change of this amount should not be reduced suddenly, but should be a slow process. If the pump has not been overhauled for a long time, the flow will be reduced but the operation is stable, which is likely to be caused by the wear of the mouth ring, which must be disassembled for inspection. The solution is to reuse the new pump body mouth ring and impeller mouth ring
Can the scroll pump be exhausted under pressure?

How to use heat transfer oil pump correctly

The air-cooled high-temperature heat transfer oil pump is also called heat transfer oil pump, high-temperature heat transfer oil pump and heat transfer oil circulating pump. Its structure and performance make it widely used and popularized in different industries. It can withstand high temperature and has good sealing performance at high temperature. It is a major leap in technology in the oil pump industry.

It is applicable to petroleum and chemical industry, oil industry, synthetic fiber industry, textile printing and dyeing industry, plastic and rubber industry, paper industry, wood industry, construction industry and other industries. In addition, ry high-temperature heat transfer oil pump is also widely used in machinery industry, food industry, pharmaceutical production, oil supply circulation system of hot oil furnace and hot oil heating circulation system. But how to use the heat transfer oil pump correctly to improve its efficiency? Here are some points we can analyze and refer to:

Accurate use method of hot oil pump:

First, after the heat transfer oil pump and pipeline are installed, whether using water pressure or air pressure, the inlet and outlet valves of the heat transfer oil pump must be closed before pressure test, so as to prevent damage to the seals and oil leakage.

Boot preparation

(1) Clean up the site, unscrew the bearing seat screws and add heat transfer oil as lubricating oil

(2) Before start-up, fill the heat transfer oil pump with the heat transfer oil delivered to drive out the air in the heat transfer oil pump. At this time, the gate valve on the pipe at the outlet of Shanghai Zhengao Pump Manufacturing Co., Ltd. shall be closed

(3) The delivered heat transfer oil shall be heated evenly before start-up, and the preheating is carried out by using the delivered heat transfer oil continuously through the pump body Preheating scale: the temperature of the pump shell of the heat transfer oil pump shall not be lower than the inlet oil temperature by 40 ℃, and the preheating speed shall be 50 ℃ / h. during startup preheating, loosen the side nut on the pump foot by 0.3-0.5mm, and tighten it after preheating

(4) When moving the coupling pump by hand, it should roll flexibly
2BE liquid ring pump in mining vacuum filter of application

Guidance on specific methods of using sewage pump

The whole sewage pump is made of stainless steel to meet the occasions with corrosive medium. It has no blockage, automatic coupling equipment, motor monitoring system and water leakage maintenance function. It is widely used in sewage drainage stations in residential areas. Discharge of thin mud in municipal engineering and construction site. Water supply equipment of waterworks.

Farm sewage discharge and rural farmland irrigation. Supporting exploration mines and water treatment equipment. Instead of carrying people on their shoulders, they suck river mud. Wastewater discharge of enterprises. Urban sewage treatment plant discharge system. Subway, basement, civil air defense system drainage station. Sewage discharge from hospitals, hotels and high-rise buildings.

Jog the motor to see if the motor turns correctly. Start the motor. When the stainless steel blowdown pump works normally, open the outlet pressure gauge and the inlet vacuum pump. After it shows appropriate pressure, gradually open the gate valve and check the motor load together. Try to control the flow and head of the stainless steel water pump within the range indicated on the sign, so as to ensure that the stainless steel water pump works at a higher working efficiency point, so as to achieve greater energy-saving effect.

During the operation of stainless steel sewage pump, the bearing temperature shall not exceed the ambient temperature of 35C, and the higher temperature shall not exceed 80C If the stainless steel sewage pump is found to have abnormal sound response, park immediately to check the reason. Check whether the stainless steel sewage pump, pipeline and joint are loose. Roll the stainless steel water pump by hand to see if the stainless steel water pump is flexible.
Does the liquid ring pump have requirements for the working fluid?

Service conditions and characteristics of pipeline non clogging sewage pump

GW vertical pipeline sewage pump is easy to install and has a wide range of uses. It can be used as a general pipeline pump to supply pressurized water to high-rise buildings. It can also transport sewage containing granular fiber. In addition to conveying sewage, it is also suitable for drainage pump, filtration flushing condensate circulating pump, etc. This series of pumps adopts unique impeller structure and new mechanical seal, which can effectively transport solids and long fibers. Compared with the traditional impeller, the pump impeller adopts the form of single channel or double channel. It is similar to an elbow with the same cross-section size and has very good overcurrent. Equipped with a reasonable worm chamber, the pump has high efficiency. After the dynamic and static balance test of the impeller, the pump has no vibration in operation.

Service conditions of pipeline non clogging sewage pump

A. The service ambient temperature of pipeline sewage pump is ≤ 40 ℃, and the humidity is ≤ 95%; Altitude ≤ 1000m.

B. The medium temperature shall not exceed 60 ℃, and the medium weight shall be 1 ~ 1.3kg/dm3.

C. The application range of cast iron material is pH5 ~ 9.

D. Stainless steel can use general corrosive media.

E. The altitude of the operating environment shall not exceed 1000 meters. If it exceeds the above conditions, it shall be put forward at the time of ordering, so as to provide you with more reliable products.

Note: if the user has special temperature, medium and other requirements, please indicate the details of the transmission medium when ordering, so that the unit can provide more reliable products.

Product features of pipeline non clogging sewage pump

1. The pump and motor are directly connected and coaxial. It is an electromechanical product with compact structure and stable performance.

2. The design of anti clogging hydraulic components with large flow channel greatly improves the dirt passing capacity, and can effectively pass through fiber materials with 5 times the diameter of the pump and solid particles with a diameter of about 50% of the diameter of the pump.

3. The design is reasonable, the supporting motor is reasonable, the efficiency is high, the noise is low, and the energy-saving effect is remarkable.

4. The mechanical seal adopts hard wear-resistant tungsten carbide, which is durable and wear-resistant, and can make the pump operate safely and continuously for more than 8000 hours.

5. The pump is a vertical structure, the inlet and outlet center lines are on the same horizontal line, and the inlet and outlet flanges have the same specifications, which is very convenient for installation and disassembly.

6. The floor area is small and there is no need to build a computer room, which can save a lot of capital construction costs; Add a protective cover at the fan blade end of the motor, and the whole machine can be placed outdoors.
EVP liquid ring vacuum pumps used in mine plant

How does multistage centrifugal pump balance axial force

The chemical pump balances the axial force through the combination of balance disc and balance drum. The balance disc has axial clearance, and the balance chamber is connected with the inlet by pipeline.

When the rotor of the multi-stage centrifugal pump moves to the inlet end, the axial clearance of the balance disc decreases, the radial clearance of the balance drum remains unchanged, and the chamber pressure between the balance drum and the balance disc increases to balance the increased axial force. This structure overcomes the shortcomings of the balance disc, has small leakage and can automatically balance the axial force.

The thrust bearing is installed behind the radial bearing at the outlet end. It can bear axial forces in two directions, and it can fix the rotor at a certain position. This bearing can bear the additional force or residual axial force generated by the operation of the pump under various abnormal working conditions.

Thrust bearing, for small pumps with small axial force, it is usually a simple and economical method to use thrust bearing to bear axial force. Even if other balancing devices are used, thrust bearings are sometimes installed in consideration of the total residual axial force.

A balance pipe is installed on the pump body of the multi-stage centrifugal pump, and the high-pressure end near the wheel Yi outside the impeller disc is connected with the suction end of the centrifugal pump with a pipe to basically balance the pressure on both sides of the impeller, so as to eliminate the axial force. The advantages and disadvantages of this method are similar to those of the balanced hole method. Some centrifugal pumps are equipped with balance pipe and balance hole at the same time, which can get better balance effect

Double suction impeller is adopted, which makes use of the structural characteristics of the impeller to achieve its own balance. Since the two sides of the double suction impeller are symmetrical, there will be no axial force in theory, but due to the manufacturing quality and the difference of liquid flow on both sides of the impeller, it is impossible to balance all the axial force

Radial rib plate is set on the impeller, and radial rib plate is set outside the impeller disc to balance the axial force. After setting the radial rib plate, the liquid in the high-pressure side of the impeller is driven by the radial rib plate to rotate at a speed close to the rotation speed of the impeller. Under the action of centrifugal force, the liquid pressure in the cavity is reduced, so as to balance the axial force on both sides of the impeller
CL type liquid ring vacuum pump for introduction of lobe purge

Why is the plastic self-priming centrifugal pump always broken

1、 The plastic self-priming centrifugal pump needs to be disassembled and cleaned regularly.

Due to the internal rotation direction of plastic self-priming centrifugal pump and the nature of impurities, a small part will remain in the pump, and impurities are easy to nest between turbine chamber and rotor stator. These dirty things will reduce the water flow of the pump, increase the working temperature and increase the noise.

Therefore, it is recommended to clean the plastic self-priming centrifugal pump once a month, open the protective cover, remove the turbine, rotor and shaft, thoroughly clean the interior, and clean the surface or dead corner with waste toothbrush.

2、 The plastic self-priming centrifugal pump shall not be installed too close to the sand.

Some people like to install the plastic self-priming centrifugal pump close to the bottom. They think that the dirt will be pumped thoroughly. In fact, it is meaningless. As long as the water pump is circulating, the dirt will be pumped into the filter with the water flow.

In addition, do not let the outlet of the plastic self-priming centrifugal pump face too close obstacles, and do not deliberately block the outlet or half of it. These practices will shorten the service life of the plastic self-priming centrifugal pump.
water ring vacuum pump manufacturers by analysis of pipeline leakage methods and measures

Model parameters and type selection of pipeline pump

Pipeline pump model, pipeline pump model parameters, pipeline pump selection

1、 Selection of pipeline pump

Pipeline pump refers to the pump products installed in the middle of the pipeline to play the role of pressurization. Generally, pipeline pumps are vertical pipeline pumps. Zui commonly used pipeline pumps are ISG vertical pipeline pumps. This series of vertical pipeline pumps are mainly used to transport clear water medium and can not transport liquids containing particulate impurities. They are mainly made of cast iron and all kinds of stainless steel, If the liquid transported is flammable and explosive, explosion-proof motor and copper impeller shall be selected: explosion-proof pipeline pump can be used. If it is used to transport impurities containing particles, GW sewage pipeline pump should be selected. The impeller of this sewage pipeline pump adopts semi closed impeller, so it can transport all kinds of sewage media. The material is also divided into cast iron and all kinds of stainless steel. In addition, FRP pipeline pump or fluorine lined pipeline pump can be used to transport acid medium.
How often does EVP-200PB series scroll pump replace the sealing strip?