How do centrifugal pumps reduce vibration, and what causes centrifugal pump vibration?

The notion upstairs is incorrect.

The vibration of centrifugal pumps is generally divided into axis deviation (coupling misalignment), loose anchor bolts, damaged impellers, less flow, and broken bearings. Bearing sleeve damage and so on. These are just phenomena.

Most likely not the reason. As long as you are an insider, he will!

To find the root cause of the pump vibration. As.

1. Cavitation or because of the wrong process conditions, pump selection or pipeline design.

For example, if the inlet pressure of a multistage centrifugal pump is 15bar, if it is water, if the water temperature is close to the vaporization point of the water at this pressure, it is easy to cavitate for a long time and it will vibrate, which will lead to bearing damage, mechanical seal damage, impeller damage, etc.) This fault solution is: a feed water cooling (increase jacket, coil, etc.) b increase the pump inlet pressure (add pump before pump, or increase the height of backfilling, etc.).

If it is just a replacement of spare parts, can it solve the problem? I'm afraid that in less than a month, I will have to replace spare parts.

2. The fluid flow of the pipeline is not stable and vibrates.

3. The pump has reached the service life and has reached the wear period.

4. Other reasons.

So, it's not because of the phenomenon you're talking about that the vibrations are causing it. You're just looking at appearances.

The vibration of centrifugal pump is generally divided into axis deviation, loose anchor bolts, damaged impeller, low flow rate, and broken bearing. The bearing sleeve is damaged, etc., I don't know how the main pump vibrates. The details are easy to answer for you.

Generally speaking, it is caused by bearing damage, and mechanical seal or packing seal damage is leakage without large vibration. Simply to avoid damage to the normal operation of the pump in the case of insufficient flow, the small outlet valve can be closed. Others need to be disassembled for maintenance.

The causes of centrifugal pump vibration can be due to the following aspects:

1.Impeller imbalance: Impeller imbalance is one of the main causes of centrifugal pump vibration. Impeller imbalance can be caused by errors in the manufacturing process, damage or wear of the impeller, etc.

2.Pump shaft bending: Pump shaft bending can be caused by improper installation of the pump, excessive pump shaft length, or improper pump shaft material, etc.

3.Bearing failure: Bearing failure can be caused by bearing damage, poor lubrication, or wear of the housing, among other reasons.

4.Pump body deformation: Pump body deformation may be caused by unsuitable pump body materials, overheating of the pump body, or the impact of external forces.

5.Improper inlet or outlet pipes: Improper inlet or outlet pipe renting can be caused by improper pipeline design, weak pipeline connections, or buildup inside the pipeline.

6.Uneven flow of liquids: Uneven flow of liquids can be caused by improper design of the inlet or outlet piping of the pump, buildup inside the piping, or improper inlet or outlet valves of the pump.

7.Improper installation of the pump: The improper installation of the pump may be caused by the unstable foundation of the pump, the levelness of the pump does not meet the requirements, or the installation position of the pump is not suitable.

a.The rotor of the pump or the rotor of the drive is unbalanced;

b.The machine rolls and disassembles the group to find the correction that does not meet the requirements of the eggplant code;

c.Large bearing wear clearance;

d.Loose anchor bolts;

e.The foundation jujube is not strong;

f.shaft bending;

g.The bracket is not firm and causes pipeline vibration;

h.friction inside the pump;

i.Loose or broken rotor parts;

j.There is a foreign object in the impeller.

There are many reasons for the noise of centrifugal pumps, mainly including the following aspects:

The pump body, inlet and outlet pipes and other parts are in poor contact with the foundation, and the vibration conduction leads to noise.

Problems such as unbalanced, damaged, and clogged impellers lead to unbalanced pump rotation.

The presence of air bubbles or impurities in the liquid causes an unstable flow of liquid within the pump.

The pump shaft is bent or the bearings are worn excessively, resulting in an unstable grip on the pump.

Ways to solve the noisy centrifugal pump include:

Check whether the centrifugal pump is in good contact with the foundation, and reinforce or repair it if necessary.

Check that the impeller is balanced, if there is any damage or blockage, and if necessary, clean or replace the impeller.

Check the liquid for bubbles or impurities, and remove the gear to clean or replace the liquid if necessary.

Check the pump shaft for bending or over-worn bearings, and replace or repair them if necessary.

Take noise reduction measures, such as increasing sound insulation materials, reducing rotational speed, etc.

To sum up, the key to solving the noisy centrifugal pump is to find out the cause of the noise and deal with it accordingly. If you can't solve it on your own, it is advisable to seek professional help.

Axial force is a force that occurs when a centrifugal pump is running, which can have an impact on the performance and life of the centrifugal pump. Here are a few ways to reduce the effect of axial forces on centrifugal pumps:

Use of double-suction inlet centrifugal pumps: The suction inlets of double-suction inlet centrifugal pumps are located on both sides of the pump body, and their suction flow is balanced on both sides, which can reduce the generation of axial forces.

Use of deflector plate: Installing a deflector at the inlet of the centrifugal pump can guide the inlet fluid flow to the center of the centrifugal pump, thereby reducing the generation of axial force.

Adjust the impeller geometry: The geometric parameters of the impeller, such as the angle of the blades, the degree of bending, the number, etc., will affect the performance of the centrifugal pump and the generation of axial force. By adjusting these parameters, the effect of axial forces can be reduced.

Install the axial force balancing device: The axial force balancing device can reduce the generation of axial force through components such as balance plate, balance plate and balance cover installed on the pump shaft.

Control the flow and head of the pump: By controlling the flow and head of the pump, the dependence of the working point of the pump on the centrifugal force can be reduced, thereby reducing the generation of axial force.

It should be noted that reducing the axial force is not a problem that can be solved by a single method, and it is necessary to comprehensively consider the various design parameters and operating conditions of the centrifugal pump, and adjust and optimize it according to the actual situation.

To reduce the effect of axial forces on centrifugal pumps, the following measures can be taken:

1.Double-suction centrifugal pumps or multistage centrifugal pumps are used to make the flow flow uniform in both directions, thereby reducing the generation of axial forces.

2.The use of reverse impeller or symmetrical impeller with different blade inclination angles makes the inlet and outlet blade inclination angles different, thereby reducing the generation of axial force.

3.Adjusting the vane or adjusting the guide vane reduces the generation of axial forces by adjusting the angle of the inlet and outlet vanes to adjust the flow rate and pressure.

4.Axial force balancing devices, such as axial force balancing discs, axial force balancing rings, etc., are used to balance the generation of axial force.

5.The method of reducing the impeller outlet diameter or increasing the impeller inlet diameter is adopted, so that the flow rate gradually decreases or increases between the inlet and outlet, thereby reducing the generation of axial force.

To sum up, there are many measures to reduce the influence of axial force on centrifugal pumps, and the appropriate method should be selected according to the actual situation.

Reducing the influence of axial force on centrifugal pumps can be improved and optimized in the following aspects:

1.Optimized impeller structure. By optimizing the inlet, outlet angle and other parameters of the impeller, the axial force of the centrifugal pump can be reduced. In addition, the use of a double-suction impeller or a multi-stage impeller can better reduce the axial force.

2.Add guide vanes. Guide vanes are able to direct fluid into the impeller and reduce axial forces, especially at low loads.

3.Adjust the gap between the impeller and the pump casing. Controlling the gap between the impeller of the centrifugal pump and the pump casing can reduce the vortex movement, and thus reduce the generation of axial force.

4.Use a balancing device. By installing devices such as balance plates or balance rings, the axial force can be balanced and the force on the bearing can be reduced.

5.Different pump shaft structures are adopted. For example, the use of a horizontal pump shaft structure can reduce the vector sum of axial forces and reduce vibration and noise.

To sum up, through one or more combinations of the above methods, the influence of axial force on centrifugal pumps can be effectively reduced.

<> large vertical centrifugal water pump has large vibration during operation, the upper and lower bearings are often heated and damaged, and even the connection between the pump shaft and the bearing is worn. The operation of the pump is unstable, which affects the normal water supply, and needs to be dampened.

1. Analysis of the causes of pump vibration.

1. The domestic vertical water pump 28SLA-10 is directly transformed from a horizontal pump. The vertical height between the motor base and the pump base is 3t, and the transmission shaft line weighs 3t. Compared to the horizontal pump, it adds an intermediate drive shaft with a length of 3752 mm and a diameter of 140 mm.

Structurally, no modifications have been made except for the addition of a bearing on the intermediate drive shaft. The four pumps operate at a long-term pressure. Under the working condition of high head and large flow, such a system with high center of gravity and large mass rotates at high speed, and the centrifugal force generated is very large, which will cause a large vibration of the unit.

In addition, the stiffness of the connection between the bracket and the inlet and outlet directions of the pump is not enough, resulting in a large displacement of the pump and each connector. The displacement of the pump during operation causes the stress condition of the upper bearing to change, and the vibration increases, so it is easy to heat up. If the displacement of the pump is corrected and the bearing stress condition is improved, the vibration intensity of the system can be reduced.

2. There is a rigid connection between the water pump and the transmission shaft. Due to manufacturing and installation reasons, the pump shaft is concentric with the transmission shaft during operation, causing the pump to vibrate; The vibration generated by other sources such as motor and drive shaft is also directly transmitted to the pump, forming a superposition of vibration and further increasing the vibration of the pump. In addition, this rigid connection increases the external force on the bearing on the water pump, which causes the bearing to heat easily and affects the pump shaft.

Second, the transformation of the pump.

In response to the above reasons, we have taken the following two steps to transform.

1. Strengthen the stiffness of the pipeline. Considering that it is difficult to reinforce the water pump, the method of welding the "stiffener" in the steel pipe at the outlet of the water pump is adopted. Along the direction of water inlet and outlet, the flanges at both ends of the connecting steel pipe between the pump outlet gradually expanding pipe and the outlet valve are welded with 8 steel plates with a thickness of 32mm and a width of 100mm.

Increase the stiffness of the steel pipe, reduce the amount of deformation, and resist the displacement of the water pump. After measurement, after reinforcement, the displacement of point A of the pump decreases.

2. Transform the transmission system. In order to reduce the transmission of vibration from the motor and transmission shaft to the water pump, Peib changed the rigid connection between the water pump and the transmission shaft to an elastic connection. Using GB4323-84 elastic sleeve pin coupling, the maximum compensation displacement of the centrifugal pump is 1°30?.

In this way, the vibrations of the motor and drive shaft can be compensated by the elastic coupling and are not transmitted directly to the water pump.

Third, the results of the transformation.

After the transformation, the vibration of the pump was reduced from the vibration velocity before the transformation. According to the vibration intensity standard ISO2372-1974, it can be determined that the pump is operating in the excellent zone. At the same time, the water pump runs smoothly, the upper bearing only needs to be maintained normally, and the pump shaft is no longer worn, indicating that the transformation is successful.

Summary. Dear, hello, I'm honored to have your problem, there are many reasons for the vibration of the pump, and different treatment methods should be formulated according to different reasons, and the following reasons and treatment methods are classified as follows:

1. The main reasons for large vibration include:

1) Unbalanced rotor;

2) Bearing damage;

3) The conveying capacity is too small;

4) low inlet pressure, 5) bending of coupling;

6) Loose foundation or anchor bolts;

7) The rotor of the pump is in contact with the stator;

8) Debris enters the pump.

2. Treatment:

1) Switch the pump and contact the fitter for maintenance;

2) Increase the conveying capacity;

3) Increase the inlet pressure.

Causes of large vibration of centrifugal pumps and treatment measures.

Dear, hello, I'm honored to have your problem, there are many reasons for pump vibration, and different treatment methods should be formulated according to different reasons, and the following reasons and treatment methods are classified as follows: 1. The main reasons for large vibration include: (1) rotor imbalance; 2) Bearing damage; 3) The conveying capacity is too small; 4) low inlet pressure, 5) bending of coupling; 6) Loose foundation or anchor bolts; 7) The rotor of the pump is in contact with the stator; 8) Debris enters the pump.

2. Treatment method: (1) switch the pump and contact the fitter for maintenance; 2) Increase the conveying capacity; 3) Increase the inlet pressure.

How to deal with the large vibration of the pump during the inspection?

That's right. Hello dear, please describe your problem.

Cause of vibration:

1. The concentricity of the pump and the motor is not enough.

2. The anchor bolt is loose.

3. There is cavitation.

4. The pipeline is loaded on the pump.

-Suhua Pumps.

1. The rotor of the centrifugal pump is unbalanced and misaligned. This problem accounts for a large proportion of vibration problems in centrifugal pumps, about 80%. Factors that cause the rotor imbalance of centrifugal pumps:

The uneven material blocking and unqualified part structure cause the rotor mass center line and the center line of the rotating shaft to not coincide and produce an imbalance formed by eccentricity. Correcting the rotor imbalance of the centrifugal pump can be divided into two. Static Equilibrium vs. Dynamic Balancing:

It is also commonly referred to as single-sided balancing and double-sided balancing. The difference is that single-sided balancing is corrected on one front, while double-sided balancing is corrected on both sides.

2. Installation reason: the foundation bolt is loose, the levelness of the calibration is not adjusted, before the centrifugal pump works, check whether the foundation bolt is loose, and whether the installation of the centrifugal pump is level. These can also cause the centrifugal pump to vibrate while it is working.

3. There are foreign substances in the centrifugal pump. Before the centrifugal pump works, check the inside of the lower pump, due to long-term use, there may be some foreign substances such as weeds in the water inside the centrifugal pump.

4. Due to long-term use, cavitation perforation inside the centrifugal pump.

5. There are unreasonable situations in the design of centrifugal pumps, such as the size of parts. However, this is relatively rare. Before the centrifugal pump leaves the factory, it will be tested many times in the workshop to ensure the qualified rate of the centrifugal pump.