What happens when the flow rate of the progressive cavity pump is lower than before?

There are several reasons why the flow rate of the progressive cavity pump is lower than before

Obstruction of the inlet valve or inlet pipeline: If the inlet valve is not opened or the inlet pipe is blocked, it will cause the progressive cavity pump to not be able to draw enough liquid, resulting in a reduced flow rate.

Obstruction of the outlet valve or outlet pipeline: If the outlet valve is not opened or the outlet pipe is blocked, it will cause the progressive cavity pump to not be able to discharge the liquid smoothly, resulting in a reduced flow rate.

Wear of internal components of progressive cavity pumps: If the internal components of progressive cavity pumps are worn, it will lead to a decrease in the efficiency of the pump and thus a decrease in the flow rate.

Excessive viscosity of the liquid: If the viscosity of the liquid is too large, it will cause the progressive cavity pump to not run smoothly and thus reduce the flow rate.

Poor Sealing of Progressive Cavity Pumps: If the sealing of progressive cavity pumps is poor, it can lead to liquid leakage and thus reduced flow rates.

The above are the possible reasons why the flow rate of the progressive cavity pump at the same speed is less than before, which needs to be analyzed on a case-by-case basis.

In the daily use of progressive cavity pumps, there are many problems that occur during operation, and the more common ones are.

First, the flow rate and head of the pump are not up to standard. Second, the power increases sharply; 3. The pump heats up during operation; Fourth, the pump vibration is relatively large; 5. Leakage of mechanical seals. This time, I will tell you about what are the reasons for the sudden decrease in flow rate during the operation of the screw pump?

First of all, in the daily use of progressive cavity pumps, the first thing to consider when not producing water is the air leakage or blockage of the suction pipeline. Leaking pipes should be eliminated or disassembled to remove blockages. 2. Cavitation occurs in the screw pump.

In the event of cavitation in the pump, the suction height of the progressive cavity pump should be reduced. 3. The wear of rods and sleeves reduces the volumetric efficiency of the pumpWhen the wear of rods and sleeves occurs, the wear parts of rods and sleeves should be replaced in time. 4. The pipeline safety valve is not closed, or it is stuck by a foreign object.

Check whether the safety valve spring is too loose or the valve seat is not tightly fitted, adjust the spring, and grind the sealing port between the valve disc and the valve base. 5. If the mechanical seal leaks, the original manufacturer should be found in time to replace the mechanical seal. 6. The viscosity of the material is too low, and when the viscosity of the material conveyed by the pump is found to be too low during operation, the service temperature of the material should be increased.

Finally, when the screw pump is in operation, the power is greatly increased, and it is necessary to pay attention to check whether the pipeline is unblocked. Whether the viscosity of the material is too large. If the pipeline is not smooth, the pipeline should be cleaned in time, and the temperature of the material should be increased in time when the viscosity of the conveyed material is too large.

Screw pumps. The flow rate is linearly related to the speed, relative to the screw pump of low speed, although the screw pump of high speed can increase the flow rate and head, but the power is obviously increased, the high speed accelerates the wear between the rotor and the stator, must make the screw pump fail prematurely, and the stator and rotor length of the high speed screw pump is very short, it is easy to wear, thus shortening the service life of the screw pump. The speed is reduced by the deceleration mechanism or the stepless speed regulation mechanism, so that the speed is kept within a reasonable range of less than 300 revolutions per minute, and the service life can be extended several times compared with the high-speed operation of the screw pump.

A progressive cavity pump is a positive displacement rotary pump, and when the outlet end is blocked, the pressure gradually rises to a predetermined pressure value. At this point, the motor load increases dramatically. The load of transmission machinery related parts will also exceed the design value, and in serious cases, the motor will burn out and the transmission parts will break.

The screw pump also has a lower speed flow rate than before, which should be the screw is polluted.

The screw pump relies on the screw to transport the material, and the gap between the screws is very small, and a little dirty matter will cause the flow rate of the screw pump to decrease.

At this point, you can pull out the screw and clean it up.

1. If there is traffic, confirm whether the traffic is small.

2. If the pump itself is normal, see if the valves in and out of the pipeline are fully open?

If there is a valve in the inlet and outlet pipeline that is not opened, or it is not opened, the flow rate will be small.

3. The small current is actually the small load of the motor, and it is best to find the reason from the pump and system.

4. There is no problem to join the system, see if there are adjustments on the pump body.

1: It depends on whether there is a problem with the selection of this pump! Is it according to the working conditions you need?

2: Whether the flange interface is leaking.

3: Whether the speed of the motor is correct.

4: Whether the rear screw of the safety valve is adjusted.

5: Whether the high-pressure chamber and the low-pressure chamber of the pump casing are colluded.

There may be an air leak somewhere in the pump.

There is a certain relationship between the speed and the flow rate of the screw spring pump. Generally speaking, the flow rate of the progressive cavity pump is positively correlated with the speed, that is, when the speed increases, the flow rate will also increase; When the rotational speed decreases, the flow rate also decreases. This is because the progressive cavity pump realizes the transfer of liquid by rotating the screw, and the change of speed will affect the volume change inside the progressive cavity pump, and then affect the size of the flow rate.

Specifically, the relationship between the flow rate of the progressive cavity pump and the wide speed of the combustion chamber depends on factors such as the geometrical parameters of the screw, the gap between the screw and the housing, and the nature of the liquid. In general, increasing the diameter or pitch of the screw, or decreasing the gap between the screw and the housing, can increase the flow rate of the progressive cavity pump. In addition, the viscosity and temperature of the liquid also have an impact on the flow rate.

It should be noted that the design parameters and operating conditions of the progressive cavity pump will have an impact on the relationship between speed and flow. Therefore, in practical applications, it is necessary to refer to the corresponding performance curve or carry out practical tests to determine the relationship between speed and flow according to the specific progressive cavity pump model and operating conditions.

There is a certain relationship between the speed and flow rate of the progressive cavity pump: the faster the speed of the screw pump, the greater the flow rate, and conversely, the slower the speed of the progressive cavity pump, the smaller the flow rate. This is due to the principle of the workbook sail of the progressive cavity pump, that is, the discharge pressure generated by the rotation of the progressive cavity pump will affect the size of the flow rate, and the discharge pressure is proportional to the speed of the progressive cavity pump, therefore, there is a certain relationship between the speed and the flow rate of the progressive cavity pump.

In general, there are two kinds of pump flow adjustment: automatic and manual, and the reciprocating pump can adjust the flow rate by adjusting the stroke, adjusting the speed of the motor and setting the bypass pipeline; The progressive cavity pump can adjust the flow rate by adjusting the motor speed.

1. Adjust the flow rate by adjusting the return flow. 2. Adjust the power supply frequency of the motor, that is, frequency conversion technology, control the speed of the motor to adjust the flow rate. 3. Adjust the stroke of the reciprocating pump.

The phenomenon of the sudden decrease in the flow rate of the progressive cavity pump in the operation of the progressive cavity pump occurs from time to time, and I don't know what the reason for the flow rate of the progressive cavity pump becomes smaller, and when checking the reason for the flow rate of the progressive cavity pump, we must first ensure that the rotation direction of the progressive cavity pump is correct, which is an obvious but often ignored problem. Make sure that the speed is correct (especially for drives that run at more than one speed, such as variable speed drives, turbines, engines, etc.).

Flow leakage is often accompanied by a decrease in system pressure, or a pump conveying less flow, or a minor leak in the system, such as through a defective or worn safety valve, branch valve, or pressure control valve. The pump may be worn out or leaked (slipped) internally, so that only less flow reaches the system. In this case, the pump needs to be repaired.

A local inspection of the pump's internal parts will often reveal wear and tear. If the operating viscosity of the liquid decreases (with new liquid added or at high temperatures), the flow rate of the rotary pump will be slightly reduced due to some of the liquid "slipping" back into the suction population (i.e. circulation), especially for high-pressure operation.

The phenomenon of flow leakage at the suction inlet due to the poor sealing of the suction inlet of the screw pump is also the reason for the small flow rate of the screw pump.

If the loss of population is small, it will hardly cause harm; If the leakage is large, it is the main cause of catastrophic damage. Suction leakage means that the flow of liquid does not reach the components of the pump or cannot enter the pump at a high enough pressure that it cannot be guaranteed to be in a liquid state when the components of the pump absorb large quantities of the conveyed liquid. Suction leakage can be caused by pump failure, cavitation, or gas content issues.

Progressive cavity pumps are self-filling. This means that, within a certain range, the progressive cavity pump has the ability to pump a certain amount of air from the ingress.

Suction to discharge (outlet) system. However, rotary pumps are often not good air compressors, and the pump outlet will be temporarily emptied to allow the inlet gas to be released from the outlet at low pressure. If possible, filling the population system with liquid, or at least filling the pump (wetting the pump's components), will greatly improve the pump's starting capacity.

Cavitation is caused by the pump not having enough pressure to prevent the vaporization of the liquid part. This situation.

It can be caused by population system throttling, excessive liquid viscosity, and excessive pump speed. Population throttling can be caused by impurities or other substances clogging the inlet filter, floating debris in the liquid covering the inlet of the piping system, or rags or small flange blanking that have not been removed from the system, especially after repairs. If the temperature of the liquid is lower than the design temperature, its viscosity (consistency) will be too high; Excessive resistance (pressure drop) is created at the population of the pipeline system.

In the latter case, it is necessary to increase the delivery temperature of the liquid. If the liquid being conveyed changes, it should be detected for changes in viscosity and temperature characteristics, or changes in the temperature characteristics of gasification pressure.

An O-shaped high-flow impeller can be replaced.

First of all, check whether there is any sundries at the inlet, as well as whether the screw and sleeve inside are in good condition, and the problem will appear.

During the use of the progressive cavity pump, if it is found that the flow rate is small, the following situations may occur:

Insufficient inlet pressure: Insufficient inlet pressure of the progressive cavity pump will cause the flow rate of the pump to become smaller. At this time, it is necessary to check whether the inlet pipe of the pump is blocked or leaking, and eliminate the problem in time.

Wear and tear of the pump: After the progressive cavity pump has been used for a long time, the parts of the pump may be worn, such as the rotor, stator, shaft sleeve, etc., which will affect the flow rate of the pump. At this point, the pump needs to be overhauled or replaced to restore the normal flow of the pump.

Insufficient pump speed: Insufficient speed of progressive cavity pumps can also lead to lower flow rates in the pump. At this time, it is necessary to check the motor and transmission mechanism of the pump to determine whether there is a fault and repair it in time.

Internal leakage of the pump: The internal leakage of the progressive cavity pump can cause the flow rate of the pump to become smaller. At this time, it is necessary to check the seals of the pump, such as gaskets, mechanical seals, etc., to determine whether there is leakage, and replace or repair them in time.

In view of the above situation, the following measures need to be taken:

Regularly check the inlet pipe of the pump for blockages or leaks, and eliminate problems in time.

Regular maintenance and overhaul of the progressive cavity pump and timely replacement of worn parts.

Check whether the motor and transmission mechanism of the pump are faulty and repair them in time.

Check the seals of the pump for leaks and replace or repair them in a timely manner.

It should be noted that for complex problems, professional technicians should be troubleshooting and dealing with them to ensure the normal operation of the progressive cavity pump.

There can be several reasons why the flow rate of a progressive cavity pump is insufficient or the discharge pressure is too low, here are some possible reasons:

Inlet valve is not fully open: Check the inlet valve to make sure it is fully open.

Blocked inlet line: Inspect the inlet line to make sure it is not blocked or leaking.

Suction line leakage: Check the suction line to make sure there is no air leakage.

Damaged impeller: Damaged impeller may result in insufficient flow or low discharge pressure and the impeller needs to be replaced.

Mechanical seal failure: Failure of mechanical seals may result in reduced pump efficiency and the need to replace mechanical seals.

Improper Impeller Clearance Adjustment: Too small an impeller clearance will result in insufficient flow, while too much clearance will result in too low discharge pressure, and the impeller clearance needs to be adjusted.

Insufficient pump speed: If the pump speed is not enough, it may result in insufficient flow or discharge pressure too low, and the pump's motor or drive needs to be checked.

Fluid viscosity is too high: High viscosity liquids can reduce the efficiency of the pump and may result in insufficient flow or too low discharge pressure.

These are common causes of insufficient flow or low discharge pressure of progressive cavity pumps, which need to be troubled and treated on a case-by-case basis.

There are several reasons why the flow rate of the progressive cavity pump is insufficient or the discharge pressure is too low:

1.The inlet valve of the pump is not fully open or blocked.

2.The outlet valve of the pump is not fully open or blocked.

3.The impeller of the pump is worn or damaged.

4.The seals of the pump are aged or damaged.

5.The speed of the pump is insufficient or the motor power is insufficient.

6.There is a blockage or narrowing of the inlet or outlet piping of the pump.

In response to the above reasons, the following measures can be taken:

1.Check that the inlet and outlet valves are fully open, and clean the valve blockages.

2.Inspect the impeller of the pump for wear or damage and replace it if necessary.

3.Inspect the seals of the pump for age or damage and replace them if necessary.

4.Check whether the speed and motor power of the pump meet the requirements, and adjust or replace them if there is a problem.

5.Inspect inlet and outlet pipes for blockages or narrowages, and clean or replace pipes if necessary.

It should be noted that when dealing with the problem of insufficient flow or low discharge pressure of progressive cavity pump, the specific cause of the problem should be determined first, and then corresponding measures should be taken to deal with it. At the same time, regular maintenance can effectively extend the service life of the progressive cavity pump.