What is the problem of slow pumping of self priming pumps?

Self-priming pumps. In the process of daily use, there will be some common problems. For example, the problem of non-pumping of self-priming pumps will be caused by many different reasons, so how do we deal with these problems.

Generally, the reasons for the problem of self-priming pump not pumping include the following aspects: 1. The first time to use a self-priming pump; The so-called self-priming pump means that there is no need to add water when the self-priming pump is started, and its own impeller can do it, and the larger the sealing gap of the impeller, the lower the self-priming height. This is not to say that the self-priming pump does not need to add water, after the first installation of the self-priming pump, it is still necessary to fill the water and use the impeller of the self-priming pump to suck the water up.

2. The self-priming pump has a long time to be watered; The reasons for this situation may be: less water diversion, loose screws in the inlet and outlet caps of the self-priming pump, insufficient sealing of the inlet pipe, and small self-priming pump (in this case, you can consider replacing a self-priming pump with a larger suction stroke). 3. The self-priming pump works unsteadily and often stops working for a short time.

In this case, it is recommended to check whether the physical structure or accessories of the self-priming pump are damaged, and whether there are foreign objects inside the self-priming pump, such as weeds. 4. The water output of the self-priming pump is small; When the self-priming pump has water but the water output is not very large, first of all, check whether the gap between the lower impeller and the casing mouth ring is too large, and you can consider changing the casing or impeller mouth ring, and secondly, there is gas storage in the water pump is also a possible reason.

First, another possibility is that the impeller's water flow pipe is blocked by foreign objects, and there is serious wear of the packing.

5. Before starting the self-priming pump, check whether there is liquid in the pump body, if there is no liquid, it is easy to cause abnormal phenomena such as empty pumping and burning mechanical shaft seals.

When dealing with the problem of self-priming pump not producing water, we must investigate the causes of the pump problem one by one. Quickly find the cause of the problem and make the self-priming pump work properly.

See if the pipe connections are connected. Another is that theoretically speaking, the speed of your self-priming pump motor is too low, which is also the reason for the slow water supply.

The self-priming pump pumps water slowly, which should be a manifestation of insufficient voltage, and then the water outlet ring of the self-priming pump is blocked.

.The slow water loading of the self-priming pump may be caused by the blockage of impurities in the pipeline, such as the blockage of the water inlet and the outlet due to impurities in the liquid, so that the self-priming pump has no way to suck in more liquid, resulting in the slow loading of the self-priming pump, and it is also possible that there is air entering the water inlet and causing the air in the self-priming pump, which will greatly affect the self-priming efficiency of the self-priming pump and will also lead to slow water supply, remove the impurities blocked by the inlet and outlet, and allow the self-priming pump to maximize the efficiency of self-priming.

2.The rotation of the impeller drives the self-priming pump to self-prime, and the impurities on the impeller will greatly reduce the self-priming efficiency of the self-priming pump, so it is necessary to check and maintain the cleanliness of the impeller regularly.

3.The motor does not match, assuming that we need a 2-stage motor with 3 horsepower to achieve a 25m head, then if we use a motor smaller than 3 horsepower or a 4-stage or 6-stage motor, it will cause the self-priming pump to be slow to water, and we must use a motor that can match the parameters of the self-priming pump to achieve the normal self-priming effect.

4.If the check valve is broken, the check valve will make the self-priming pump have no pressure, and the lack of pressure will cause the self-priming pump to self-prime.

It may be that the pipeline or pump body is not tightly sealed and there is a leak. It is also possible that there is a foreign object in the pipe that is blocked.

The inside of the self-priming pump is closed, and when the self-priming pump is running, it will form a suction force on the water, and pump the water up through the propeller and anti-backflow parts in the pump. If there is no air leakage in the self-priming pump, the water will be continuously sucked up, but if the pump has an air leak, then the water will not be able to be sucked up. In this case, you can first check whether the self-priming pump is charged during operation, if it is not charged, the surface of the self-priming pump is smeared with soapy water, if there is an air leakage, it will be tested out, most likely caused by damage to the gasket, and the replacement can be restored to normal.

It is important to know that the reason why the self-priming pump is able to absorb water is because there is a sealed compartment inside, and in addition to the anti-backflow structure, there is also a fan blade that absorbs water in the cabin. Under normal circumstances, when the fan blade rotates, it will produce suction and suck the water out, but if the screw fixing the fan blade is loose, falling off, and the fan blade is damaged, then it will cause the power of the self-priming pump to be insufficient and unable to suck the water up. In this case, the self-priming pump can only be disassembled for inspection, re-fixed or replaced with fan blades, and the self-priming pump will return to normal.

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The self-priming pump needs to be filled with water before use to check for water leakage. The speed of water supply is also related to the location of the water source.

It may be that the seal is leaking, replace the water-sealed graphite sleeve, and do regular maintenance including lubrication.

The problem of slow water loading of the self-priming pump is undoubtedly due to the small pressure difference between the water level.

Check whether there is a water leak, and the speed of water supply is also related to the location of the water source.

That is, the pressure of the water source is too low, and the water absorption in the pipe diameter is not enough.

Generally speaking, it is still the inlet check valve that leaks. But if you still use the water, it means that the leakage is in the upper position, because it will not leak all the water, so it will slowly be watered.

In addition, it may be that your pipeline is leaking, you can see if the pipe connection is connected. Another is that theoretically speaking, the speed of your self-priming pump motor is too low, which is also the reason for the slow water supply, which you can know by feeling and listening. Finally, theoretically, your self-priming pump is installed too high, the water cannot be sucked up or it is very difficult, which is also the reason for the slow water supply, you look at the suction stroke of the self-priming pump, and then look at the vertical height of your pump centerline to the water surface at the inlet end.

Generally speaking, counting the tube loss, this height should be at least about 2m less than the suction stroke.

Related Notes:

Self-priming water pump is a type of water pump. The principle is that the pump casing is filled with water (or the casing itself contains water) before it is started. After starting, the high-speed rotation of the impeller makes the water in the impeller channel flow to the vortex shell, and then the inlet forms a vacuum, so that the water inlet backstop door is opened, and the air in the suction pipe enters the pump, and reaches the outer edge through the impeller channel.

Through repeated circulation, the air in the suction line is gradually exhausted, so that the water enters the pump and completes the self-priming process.

Pump researchers and manufacturers at home and abroad have successively developed a variety of water ring self-priming pumps, that is, the water pump is installed above the water surface, and the gas and water are "miscible" in the pump by mixing gas and water, and the water and gas are separated at the outlet, and the gas is gradually discharged to achieve normal drainage. This type of pump must be filled with water before the first start, and it is bulky, inefficient, and has a narrow scope of application.

Summary. <>

Hello dear, I am happy to answer for you, What happened when the self-priming pump stopped pumping water in less than a few minutesAnswer: Dear, hello, the reason is that the water is not enough to pump, the power supply is faulty, the pump impeller is damaged, etc. Reason:

1. Due to the long-term potential underwater, the water inlet pipe wall corrodes holes, and the water surface continues to decline after the pump works, and when these holes are exposed to the water surface, the air enters the water inlet pipe from the holes. 2. Cracks at the elbow of the inlet pipe, and a small gap at the connection between the inlet pipe and the pump, may cause air to enter the inlet pipe. This is the case when air enters the inlet pipes and pumps.

3. Improper installation. The center distance of the two pulleys is too small or the two shafts are not too parallel, the transmission belt is tightly installed on it, resulting in the wrapping angle is too small, the diameter of the two pulleys is calculated wrong, and the eccentricity of the two shafts of the water pump driven by the coupling is large, etc. Wishing you a happy <>

The self-priming pump stopped pumping water in less than a few minutes.

Hello dear, I am happy to answer for you, What happened when the self-priming pump stopped pumping water in less than a few minutesAnswer: Dear, hello, the reason is that the water is not enough to pump, the power supply is faulty, the pump impeller is damaged, etc. Reason:

1. Due to the long-term potential underwater, the water inlet pipe wall corrodes holes, and the water surface continues to decline after the pump works, and when these holes are exposed to the water surface, the air enters the water inlet pipe from the holes. 2. Cracks at the elbow of the inlet pipe, and a small gap at the connection between the inlet pipe and the pump, may cause air to enter the inlet pipe. This is the case when air enters the inlet pipes and pumps.

3. Improper installation. The center distance of the two pulleys is too small or the two shafts are not too parallel, the transmission belt is tightly installed on it, resulting in the wrapping angle is too small, the diameter of the two pulleys is calculated wrong, and the eccentricity of the two shafts of the water pump driven by the coupling is large, etc. Wishing you a happy <>

Is this fault related to the overheating protection of the motor?

Dear, this must be related, the overheat protector is self-protecting and the power is off and shut down. Because the water pump works underwater, its motor is cooled by water cooling, unlike ordinary motors with cooling fans, I hope mine can help you! Wishing you a happy <>

Summary. Hello, the suction pump is a self-priming centrifugal pump, which has the advantages of compact structure, easy operation, stable operation, easy maintenance, high efficiency, long life, and strong self-priming ability. It is a type of water pump that does not require a foot valve to be installed in the pipeline.

When there is debris blockage in the pump body or pipeline, there will also be a situation that the self-priming pump cannot be watered, and the debris needs to be cleaned up so that the pipeline and the pump body are unblocked.

The self-priming pump needs to contain a certain amount of fluid extraction when it works, so it is necessary to load the water into the self-priming pump before use.

Insufficient water pressure, too long water pipes, and poor sealing of the pump will also cause the inlet part of the pump to fail to form a vacuum and cause water to not be filled.

Leaking air from the water pipe, leaking water, or poor sealing of the water supply pipe will also cause the self-priming pump to fail to supply water, and the water pipe can be repaired or replaced.

Check whether there is air leakage at the leakage of the machine, if there is air leakage, you can repair it by adding gaskets and tightening screws.

The self-priming pump is working normally but does not run on water.

Hello, the suction pump is a self-priming centrifugal pump, which has the advantages of compact structure, easy operation, stable operation, easy maintenance, high efficiency, long life, and strong self-priming ability. It is a type of water pump that does not require a foot valve to be installed in the pipeline.

When there is debris blockage in the pump body or pipeline, there will also be a situation that the self-priming pump cannot be watered, and the debris needs to be cleaned up so that the pipeline and the pump body are unblocked.

The self-priming pump needs to contain a certain amount of fluid extraction when it works, so it is necessary to load the water into the self-priming pump before use.

Insufficient water pressure, too long water pipes, and poor sealing of the pump will also cause the inlet part of the pump to fail to form a vacuum and cause water to not be filled.

Leaking air from the water pipe, leaking water, or poor sealing of the water supply pipe will also cause the self-priming pump to fail to supply water, and the water pipe can be repaired or replaced.

Check whether there is air leakage at the leakage of the machine, if there is air leakage, you can repair it by adding gaskets and tightening screws.

Cause analysis and solutions:

Changzhi 1, the bottom valve of the water pump is stuck, there is silt inside, the high degree of water is too high or leaking, the road is blocked, after checking one by one, you can take measures to repair the bottom valve, take out the blockage, correct steering, clean the impeller and other measures to deal with;

2. The violent vibration of the water pump combined with the unbalance of the electric rotor or the poor coupling, the bearing is worn and bent, the rotating parts are loose, and the broken pipeline support is not firm, which can be adjusted, repaired, reinforced, straightened, replaced and other methods can be taken to deal with them;

3. The installation of the screw cap is not tight, you can tighten the nut by hand, and in serious cases, it must be re-disassembled;

4. If the packing and packaging are too tight and cause overheating, you can take appropriate packing blue cover, clean up the sealing blockage and other measures, and new filler.

The self-priming pump needs to meet certain working conditions in order to work properly during the pumping process, otherwise the pumping will stop in less than a few minutes. Here are a few possible causes and how to deal with them:

The gas in the pump is not completely discharged: the self-priming pump needs to be cleaned before use, otherwise the gas in the pump cannot be discharged, resulting in the pump being unable to pump water normally. The treatment method is to release the air in the pump, which can be manually discharged by opening the vent valve at the pump body or water outlet or adding water multiple times.

Blocked inlet pipe: If the inlet pipe of the self-priming pump is blocked, it will cause the pump to fail to feed and pump water normally. You can check the inlet pipe for blockages and clean up the blockages.

Impeller damage: Damage or deformation of the impeller of the self-priming pump will cause the performance of the pump to deteriorate and prevent normal pumping. In this case, the impeller needs to be replaced.

Motor failure: If there is a fault in the motor of the self-priming pump, it will cause the pump to not work properly. You can check whether the motor has any abnormal phenomena, such as abnormal motor sound, motor cannot start, etc.

In conclusion, there can be a number of reasons why a self-priming pump stops pumping water in less than a few minutes, which needs to be analyzed on a case-by-case basis. It is recommended that you check the instruction manual of the self-priming pump or contact the manufacturer or after-sales service personnel for inspection and maintenance.