When pumping water, will the increase in the pipe diameter of the pump increase the load on the moto

The power of the centrifugal pump is proportional to the flow rate, the pipe diameter of the pump increases, the motor load will not increase under the condition that the flow rate remains the same, and the motor load will increase if the head decreases or the resistance decreases, resulting in an increase in the flow rate.

Actual head of the pump = total head loss head. When the pump model is determined, the total head is certain, the loss head mainly comes from the pipeline resistance, the smaller the pipe diameter, the greater the resistance, so the greater the loss head, so after reducing the pipe diameter, the actual head of the pump can not only not increase, but will decrease, resulting in a decrease in pump efficiency. In the same way, when the small diameter pump is pumped with a large water pipe, the actual head of the pump will not be reduced, but the loss head will be reduced due to the decrease of the resistance of the pipeline, so that the actual head will be improved.

The size of the liquid pressure is only related to the head level, but not to the cross-sectional area of the water pipe. As long as the head is constant, the size of the impeller of the pump remains unchanged, and the pressure acting on the impeller is constant no matter how large the pipe diameter is. However, when the pipe diameter increases, the water flow resistance will decrease, and the flow rate will increase, and the motor load will also increase appropriately.

It depends on the type of pump.

In the case of centrifugal pumps, increasing the diameter of the pipe theoretically increases the flow rate and thus increases the load on the motor.

Of course, if the actual flow rate is within the rated range, it will not matter.

The size of the liquid pressure is only related to the height of the head, and has nothing to do with the cross-sectional area of the water pipe.

The increase in the operating current of a water pump can be caused by a number of reasons. Here are some common reasons that can lead to an increase in pump current:

Excessive load: If the pump needs to withstand a large load, for example due to increased system demand or an increase in the density and viscosity of the conveyed medium, the operating current of the pump may increase accordingly.

Inappropriate pump selection: If the pump is not suitable for the system requirements, it may lead to an increase in operating current. In this case, it may be necessary to replace the appropriate pump to meet the system needs.

Impeller clogging or wear: Clogging or wear of impurities on the impeller can cause the pump to run poorly, resulting in increased current. The impeller needs to be checked and cleaned regularly to ensure that it is operating properly.

Bearing wear: Bearing wear can lead to increased friction between the pump shaft and the motor shaft, resulting in an increase in operating current. Bearings need to be inspected and replaced regularly.

Insufficient lubrication: Insufficient lubrication can lead to increased friction between components, which can increase the operating current. Regular inspection and oil replacement is important to keep the pump up and running.

Mechanical failures: Other mechanical failures in the old part of the pump, such as seal failure or component damage, can also lead to an increase in operating current. Pumps need to be inspected and serviced regularly to ensure that they are functioning properly.

In order to solve the problem of hail or increase in running current of the pump, it is necessary to investigate and repair the specific cause. Regular inspection, maintenance, and replacement of critical components of a water pump is important to ensure its proper operation and reduce operating current.

Hello:— 1. The running current of the pump is too highOne of the reasons

It may be that the outlet pipe is long.

The operating current increases.

2. The running current of the pump is too highReason two, it may be a water pumpThere is a debris blockage at the water inlet, the water pump is runningThe resistance increasesThis increases the operating current。Shouting Mausoleum.

3. In addition,The motor itself is also not excluded.

Causes, such as:The motor configuration is not suitableThe quality of motor repair (rewinding) is poor, and the connection between the pump and the motor is not concentricWait for the roll.

The reason why the motor current increases when the pump is running ().

a.The filler is pressed too loosely.

b.Friction occurs in the rotating part of the pump body.

c.The shaft of the pump is bent or deviates greatly from the axis line.

d.The gap between the sealing ring and the impeller is too large.

Correct answer: Friction occurs in the rotating part of the pump body, and the pump is bent or deviated from the shaft line greatly.

No, there are two parameters of the pump, flow and head, for example, a pump, the flow rate is large, the head is low, on the contrary, the flow rate is small, the head is high. The motor is configured according to the pump, and the current of the motor should be within the rated current range.

Not necessarily, the power of the motor decides.

magnitude of the current, and.

Head, water output.

are all related, and some have a very large water output.

The head is not negotiable.

As the flow rate of the pump increases, the current of the motor will be higher or lower.

The larger the pump head, the greater the motor current.

For the same pump, the smaller the head p, the larger the output water flow weight q, and the greater the working current i of the motor.

At the highest head, the output flow rate q of the pump is the smallest and may be 0, so its working current is the smallest.

When a high-power high-pressure pump is started, the output valve needs to be closed (the pressure (head) of the pump is the highest), because the working current in this case is the smallest.

p=ui=ρghq/n1/n2

i=ρghq/n1/n2/u

Therefore, the current i is directly proportional to the density, head, and flow rate of the water, and inversely proportional to the voltage.

For the same motor, when the flow rate is constant, Yang.

The greater the power range, the greater the current; If the flow rate decreases more than the head increases, the current decreases.

The flow rate of the water pump decreases, the speed generally does not change, and the power of the motor generally changes.

Different types of pumps have different flow-power curves. The following is an example of the most common centrifugal pump in relation to other pump parameters. A typical centrifugal pump flow-power curve is shown in the P-QV curve (red line) in the figure below.

According to the flow-power curve, it can be seen that the power increases nearly linearly with the increase of flow and decreases nearly linearly with the decrease of flow.

In fact, the shaft power of the pump p= gqh (1000 K), where.

H: is the head, the unit m, Q: is the flow, the unit is m3 s, the efficiency of the pump, generally, P: is the shaft power, the unit kw, K: the matching coefficient, the small power is generally taken, the working medium density, generally water.

Therefore, for a given pump, the power is theoretically proportional to the flow rate. In fact, the efficiency of the pump changes as the flow rate changes, so it can only be close to proportional.

The speed of the pump in operation generally only depends on the speed of the pump power engine (motor, diesel engine, etc.), and the flow rate of the pump generally cannot affect its speed. However, when designing the pump, the flow rate is related to the speed, and when other design parameters remain unchanged, the high speed of the pump means that the flow rate of the pump is large.

One thing is for sure is that the flow rate is reduced, and the rotational speed is reduced! The change of power depends on the change of head! If the head increases as the flow rate decreases, the power may not change!

1. The decrease in the flow rate of this pump is not due to the speed. Because the motor it is equipped with is not inverted, the frequency of the power supply remains the same, and the number of revolutions of the motor will not change.

2. The flow rate of the water pump decreases, which may be due to the fact that the impeller becomes smaller due to cavitation or wear, the gap of the impeller housing changes, the impeller is stuffed with foreign objects, and a certain point of the suction inlet leaks.

3. It is also possible that the resistance of the whole system increases, which makes the working point of the pump move to the left.

When the pump is running, when () will cause the current of its motor to be too small.

a.The debris in the leaf cave wheel is stuck.

b.The suction bottom valve cannot be opened.

c.Pump cavitation.

d.The bearing damage is leaky.

Correct answer: The suction bottom valve cannot open the water pump cavitation.

Summary. The reason why the self-priming water pump is energized but the power is not large: 1. The water seal is not tightly sealed.

2. The screw is severely worn. 3. The pump body is corroded and has small air inlet holes. 4. The impeller is seriously worn.

5 is the motor speed is low with 2800 rpm. Thoroughly inspect and replace damaged or suspicious parts, and faults can be rectified.

The reason why the self-priming water pump is energized but the power is not large: 1. The water seal is not too late, and the cherry shed is tight. 2. The screw is severely worn.

3. The pump body is corroded and has small air inlet holes. 4. The impeller is seriously worn. 5 is the motor speed of the low code with 2800 rpm.

Conduct a thorough inspection, replace damaged or suspicious parts, and eliminate faults.

What is the extent of the pump dust and what is the water consumption? If it is a direct pump, then Dabi can choose a water pump with matching power. If it has a reservoir, you can add a small pump to replenish the water when the water is insufficient.

There are other ways to not talk about it.

Pro, the self-priming water pump is energized but the power is not large, which may be caused by the following reasons:1Clogged inlet pipe or suction filter:

If the water inlet pipe or suction filter is blocked, it will cause the water inlet of the pump to be poor, reducing the water absorption capacity of the pump, resulting in low power. 2.Damage to the impeller or impeller shaft:

If the impeller or impeller shaft of the water pump is damaged, it will cause the speed of the water pump to be unstable, reduce the water absorption capacity of the water pump, and thus cause the power to be low. 3.Motor damage:

If the pump motor is damaged, it will cause the pump speed to be unstable, reducing the water absorption capacity of the pump, resulting in low power. 4.Power issues:

If the power supply voltage is unstable, it will lead to unstable operation of the pump, and the power is not large. If the pump is powered on but the power is not large, you can first check whether the pump inlet pipe and the suction rent filter are blocked, and clean up the blockage; If there is no blockage, you can check whether the impeller and impeller shaft of the pump are damaged, and replace the impeller or impeller shaft if necessary; If there is no problem with the impeller and impeller shaft, you can check whether the pump motor is working normally, and if there is a beam, the motor can be replaced; At the same time, it is also necessary to check whether the power supply is stable, and replace the power supply if necessary. If none of the above methods can solve the problem, it is recommended to ask professional technicians for maintenance.

Summary. The pump reversal will also produce water, but the head and pressure are greatly discounted, I have just finished debugging a pumping station, the installation of Kaiquan multistage pump, equipment: multi-stage clean water pump motor power 4 level 75kw head 100 meters 76%, frequency conversion control, motor nameplate nominal current 143.

Set the motor steering according to the direction indicated by the pump OK Set the starting time 28 seconds Start frequency 5hz After starting, it was found that the head could only reach 50 meters, (at that time, the pressure gauge was not installed and the water pressure could not be observed) The current was 118 in the early stage About 3-5 minutes later, the current dropped to about 97 after about 3-5 minutes, and no problems were found in the inspection everywhere, I suspected that there was a problem with the pump, and I suspected that the bottom valve was not completely opened. Reset the steering, restart and find that the current reaches the pressure of the main force gauge installed after the observation reaches the head close to the design requirements, and the problem lies in the manufacturer's indication is reversed.

The water pump is a kind of pumping equipment, and the control line of the pump motor with a large capacity belongs to the + control line.

Hello, I am inquiring for you, please wait a while, I will reply to you immediately The pump reversal will also produce water, but the head and pressure are greatly discounted, I have just finished debugging a pumping station, the installation of Kaiquan multistage pump, equipment: multi-stage clean water pump motor power 4 75kw head 100 meters 76%, frequency conversion control, motor nameplate nominal current 143. Set the motor steering according to the direction indicated by the pump OK Set the start time 28 seconds Start frequency 5hz after opening the limb finger gear machine found that the head can only reach 50 meters, (at that time the pressure gauge was not installed and the water pressure could not be observed) the current in the early stage of 118 about 3-5 minutes after the current dropped to about 97, everywhere checked and found no problem, suspected that the pump had a problem, suspected that the bottom valve was not completely opened, after eliminating the cause of the bottom valve, it was really impossible, in almost despair, I thought about whether it would be a problem with the direction marked by the pump, reset the steering Restart and find that the current reaches the pressure of the main pipe force gauge installed after the observation reaches the head close to the design requirements, and the problem is that the factory is closed The label is reversed.