What is the reason for the large operation vibration of one of the boiler feed pumps of the mother t

1. Vibration caused by unbalanced rotor mass.

2. Static friction produces vibration.

3. Poor grouting of the 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 coupling.

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. Vibration 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 operation of the pump, and the quality of the motor is directly related to the stability of the operation 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. Vibration 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. The rapid change of pressure and water hammer in the water pipeline caused by the dynamic excessive process such as the start and shutdown of the water pump, the opening and closing of the valve, the change of working conditions and the emergency shutdown of the accident also often lead to the vibration of the feed pump unit.

The axis of the pump is offset from the axis of the motor.

The dynamic balance of the wheel and impeller is broken.

The motor feet are loose.

1. Vibration caused by cavitation, 2. Blockage of the filter screen at the inlet of the water pump 3, when the feed pump is running, the low-pressure feed valve is not fully opened, resulting in insufficient inlet flow of the feed pump, which reduces the pressure at the inlet of the pump 4, the rapid change of pressure in the water pipeline and the action of water hammer caused by dynamic excessive processes such as pump start and shutdown, valve opening and closing, working condition change and emergency shutdown of accidents, etc., often lead to vibration of the feed pump group 5, The pump inlet and outlet pipes are installed with additional stress, and the most likely situation you said is 4.

The causes of vibration are:

1) The center of the pump and motor is not correct.

2) The anchor screws of the pump body or motor are loose, or the foundation is not firm) (3) The bearing cover is not tight enough, so that the bearing pad jumps in the body.

4) The rotor mass is unbalanced.

5) The dynamic and static parts (such as balance plates, sealing rings) are rubbed against each other.

The following is an analysis of the causes and elimination measures of rotating equipment and pipeline vibration, as a reference for preventing and eliminating pipeline vibration in on-site construction.

1.The vibration of the electric motor causes the pipe to vibrate.

2.Vibration of the pump body causes vibration of the pipeline.

3.Other causes of the water supply system cause pipe vibration.

4.Other causes of pressure meganathan air shrinkage system cause vibration of the mumu pipeline.