The reason why the horizontal vibration of the water pump is large and the water pump is large

1. The structural defects of the pump itself lead to large horizontal vibration.

1. Unbalanced pump impeller: When the pump impeller rotates at high speed, if the mass distribution is unbalanced, it will cause horizontal vibration of the pump, and in serious cases, it will make the pump make abnormal noise, affecting its normal operation.

2. Bearing wear: If the pump is used for too long, the bearing is easy to wear, resulting in loose bearing, so that the pump will vibrate horizontally when working.

3. Improper installation: Improper installation may also cause horizontal vibration of the water pump. For example, unstable fixation during installation causes the pump to displace, which in turn leads to horizontal vibration.

2. Improper installation of pipelines causes large horizontal vibration.

1. The pipeline is not fixed: if the pipeline is not fixed, the pipeline will be impacted by water when the pump is working, which will make the pipeline shake continuously, which will cause large horizontal vibration.

2. Bending or damage to the pipeline: If the pipeline is bent or damaged, the water flow will be resisted when it passes, forming a local pressure wave and generating vibration, resulting in a large horizontal vibration of the water pump.

3. Other factors.

1. Fluctuation in the process of water use: If the water flow fluctuates greatly in the process of water use, the working state of the pump will change and vibration will occur.

2. Aging of pipeline gasket: If the pipeline gasket is aging, there will be water leakage, resulting in the formation of pressure waves, which makes the horizontal vibration of the water pump large.

To sum up, the horizontal vibration of the pump may be caused by the structural defects of the pump itself, improper installation of pipelines and other reasons. In order to reduce the horizontal vibration of the pump, attention should be paid to the installation quality of the pump, the status of the pump should be checked regularly, and the parts of the pump should be replaced in time.

First check the concentricity of the coupling and adjust. If not, look at the balance plate of the multistage pump to see if it is seriously abrasive, the problem of multistage pump is relatively common, and the situation does not change after changing the pump. Either it's a quality problem with the pump, and I don't know if there is a dynamic balance test of the rotor.

The horizontal vibration 21 filament is a bit too large, and it is forbidden to rotate for a long time.

The following tests and judgments are performed.

1. Measure the vibration of the foundation platen, if it is large, it means that the foundation is loose.

2. Consider whether there is a problem with the rotor material, and the rotor with poor rigidity cannot eliminate the vibration.

3. The rigidity of the bearing seat is too poor.

Didn't you use vibration isolation? Vibration isolation should be effective in reducing the horizontal and vertical vibrations of the pump.

1. The motor and pump head are not balanced tested, so there will be excessive vibration.

2. The water pump and the motor are connected and installed with axial error.

3. After the pump body and motor are installed, the static installation error correction is not carried out in time.

4. When the equipment is running, the dynamic installation error of the pump body and motor is not corrected in time.

5. The impeller is not well balanced tested, and there are foreign objects blocking the impeller runner, resulting in the impeller being heavy.

6. The bearing is damaged, and there is loosening between the pump and the base, and between the base and the foundation.

7. The coupling connected to the motor and the pump is not aligned.

8. The bearing clearance is too large, and the unit resonates at low frequency.

Reasons for the large vibration of the feed pump:

1.Vibrations caused by unbalanced rotor mass.

2.Static friction produces vibrations.

3.Poor grouting of vibration foundation caused by insufficient foundation stiffness, loose anchor bolts, loose gaskets, and weak connection of the base will cause violent forced resonance.

4.Vibration caused by abnormal couplings.

The coupling is not installed properly, the pump and motor shaft are not concentric, the pump and coupler shaft are aligned, the compensation amount of axial displacement during operation is not considered, and the coupling bolt gap is uneven, which will cause the feed pump and motor to vibrate.

5.Vibrations caused by the critical speed of the rotor.

When the speed of the rotor gradually increases and approaches the natural vibration frequency of the rotor of the feed pump, the feed pump vibrates violently, and when the speed is lower or higher than this speed, it can work smoothly. In this case, only a portion of the bolt receives most of the torque, which causes unbalanced forces to be added to the shaft that should not have been generated, causing vibrations.

6.The motor is the prime mover of the pump, and the quality of the motor is directly related to the stability of the pump. The motor bearing is damaged, and the internal magnetic force of the motor is unbalanced, which will also indirectly cause the vibration of the water pump.

If the magnetic center is not accurate during installation, it will cause the motor shaft to move back and forth, which will cause the rotor of the front pump and coupler to follow the channeling, which will cause the vibration of the pump set.

7.Vibrations caused by cavitation.

The geometric installation height of the feed pump is constant, the cavitation allowance of the pump is certain, the pressure head of the pump inlet is reduced, the pressure is reduced, and the vaporization point of the gas in the liquid is reduced under the condition of constant water temperature, so that the cavitation phenomenon occurs in the pump. The cavitation process itself is a process of repeated impact and condensation, accompanied by large pulsations, which, if the frequency is equal to the natural frequency of the pump, will cause the pump to vibrate, which in turn will cause more bubbles to be produced and burst, and the two excite each other, resulting in a stronger vibration of the pump.

8.Rapid changes in pressure and water hammer in water pipelines caused by dynamic processes such as pump start-up and shutdown, valve opening and closing, working condition changes, and accident emergency shutdown often lead to vibration in the feed pump unit.

(1) It is usually due to the fact that the manufacturing process of the water pump is not up to standard, the rotor is not balanced, the water pump and the motor shaft are not concentric, and the rotor and stator part collide or friction.

2) This is due to the use of too long, the aging and wear of the water pump, the loosening of the impeller, the large bearing clearance or the damage of the bearing.

3) There will be eddy currents when the water flow is pushed during the pump work, and cavitation will inevitably vibrate.

4) There are sundries in the inlet pipe, impeller and pump of the pump, and the pump and foundation are not fastened, and the resonance will be strengthened.

1. The choice of coupling is now generally a disturbing coupling, which can be ruled out.

2. The leveling of the motor end and the pump end of the coupling often occurs.

3. The occurrence of resonance basically does not occur.

4. There are too many differences in the dynamic balance and static balance of the rotor of the water pump, and there is no problem if the static balance of the impeller is satisfied. Unless the pump is not statically balanced. The occurrence of clan high is relatively rare.

5. The problem of the base, the installation of the motor and the pump, if it is a joint bottom Zhaofeng seat!

6. Cavitation has occurred, or the impeller and mouth ring are too worn! In the case of multistage pumps, the wear and tear of the balance disc is also a cause!

1. The reason for the vibration of the pump is that the manufacturing and processing technology of the pump is unqualified: the motor rotor is unbalanced, and the concentricity of the pump and the motor shaft is not enough; The rotor of the motor collides or rubs against a part of the stator of the motor.

2. After long-term use, the water pump is worn and embrittle, the centrifugal impeller is loose, the rolling bearing is destroyed or the rolling bearing has a large gap.

3. There are dirt in the channel pipe of the pump, the centrifugal impeller and the pump; resonance phenomena, etc.

4. When the pump is working, it is difficult to cause vibration if the vortex is generated by pushing the flowing water.

There are many reasons for the vibration of the pump, and different treatment methods should be formulated according to different reasons, and the following causes 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.

The impeller is not well balanced;

There are foreign bodies blocking the impeller flow channel, causing the impeller to be heavy;

bearing damage; The pump is loose with the base, the base and the foundation;

The coupling connected between the motor and the pump is not aligned;

The radial clearance of the bearing is too large; Unit low-frequency resonance.

The centrifugal pump uses the rotation of the impeller to make the water centrifugal move to work. Before the pump starts, the pump casing and suction pipe must be filled with water, and then the motor is started to make the pump shaft drive the impeller and water to do high-speed rotation movement, and the water undergoes centrifugal movement, which is thrown to the outer edge of the impeller and flows into the pressurized water pipeline of the pump through the flow channel of the snail pump casing.

1.There are many reasons for large vibration, some are gradual, some are sudden, and the gradual is generally caused by the wear of some parts of the pump body, and the gap is too large, such as the wear of the mouth ring, the gap is large, the shaft is bent, the impeller is corroded, the balance parts are worn, the misalignment is poor, etc., that is, the dynamic balance is damaged. Sudden type is generally like bearing damage, evacuation, sudden and warranty.

2.Electrical aspect The motor is the main equipment of the unit, and the internal magnetic imbalance of the motor and the imbalance of other electrical systems often cause vibration and noise. For example, in the operation of the asynchronous motor, the radial alternating magnetic pull between the stator and rotor generated by the harmonic flux interaction of the stator and rotor teeth, or the magnetic center of the stator and rotor is inconsistent in the operation of a large synchronous motor.

3.In terms of machinery, the quality of the rotating parts of the motor and the pump is unbalanced, shoddy, the installation quality is poor, the axis of the unit is asymmetrical, the swing exceeds the allowable value, the mechanical strength and stiffness of the parts are poor, the bearing and sealing parts are worn and damaged, and the resonance caused by the critical speed of the pump and the natural frequency of the unit will produce strong vibration.

4.In terms of hydraulics, the uneven distribution of flow rate and pressure at the inlet of the pump, the pressure pulsation of the working liquid at the inlet and outlet of the pump, the flow around the liquid, the deflection flow and the deflow, the non-rated working conditions and the cavitation of the pump caused by various reasons are all common causes of the vibration of the pump unit. Pump start and stop, valve opening and closing, working condition change and emergency shutdown in an accident.

1. The dynamic balance of the pump head is not good;

2. The water pump is connected and installed with an axial error with the motor;

3. After the pump body and motor are installed, there is no static installation error correction;

4. After the equipment is running, there is no correction of the dynamic installation error of the pump body and the motor.

Cavitation of the water pump.

The foundation of the pump installation is unstable.

The inlet and outlet pipes of the water pump are load-bearing on the pump body.

The pump is clogged or the pump shaft is bent.

Loosening of the rotor components.

Pump vibration can be caused by:

Unbalanced: The mass distribution of the rotating parts of the pump (e.g. impeller) is uneven, or there is no correct equilibrium during installation, resulting in increased vibration of the pump.

Misalignment: The axis of the pump is not aligned with the axis of the bearing, or the gap between the impeller and the pump body is uneven, which will cause the unbalanced vibration of the pump.

Gas or solid particles in the pump: There are gases or solid particles in the pump that can interfere with the normal operation of the pump and cause vibration.

Loose pump seat: The pump seat is not fixed firmly, loose or deformed, which will lead to increased vibration of the pump.

Worn or damaged impellers of pumps: Wear on the surface of the impeller or damage to the blades can cause imbalance, which in turn can cause vibration.

Bearing failure: Damaged bearings, poor lubrication, or improper installation can cause vibrations in the pump.

Pump installation problems: The installation of the pump is not firm or level, or the support of the piping system is unstable, which will not affect the vibration of the pump.

If there is excessive vibration in the pump, it is necessary to check and solve the problem in time to avoid further damage to the pump and related equipment. It is advisable to seek the help of a professional maintenance personnel or pump manufacturer for pump overhaul and adjustment.