Pump vibration caused by what are the reasons?

Pump vibration caused by the following four aspects:

1, electrical aspects

The motor is the main equipment of the unit. The internal magnetic unbalance of the motor and other electrical system disorders often cause vibration and noise. Such as asynchronous motor in operation, due to the stator rotor harmonic magnetic flux interaction between the stator and rotor radial alternating magnetic force, or large synchronous motor in operation, the rotor center of the rotor is inconsistent or in all directions air gap difference Exceeding allowable deviation, etc., may cause the motor to vibrate periodically and make noises.

2, mechanical aspects

Motor and pump rotating parts quality imbalance, shoddy, poor installation quality, unit axis asymmetry, the swing exceeds the allowable value, poor mechanical strength and stiffness of parts, bearings and seals wear damage, and the critical speed of the pump appears with the unit The natural frequency has been caused by resonance, etc., will have a strong vibration and noise.

3, hydraulic aspects

Pump inlet flow velocity and pressure distribution is not uniform, the pump import and export of working fluid pressure pulsation, flow around the liquid, bias and decoupling, non-fixed conditions and various causes of pump cavitation, are common cause pump vibration s reason. The sudden pressure changes in the water pipe and the water hammer effect caused by the dynamic transition process such as start and stop of pumps, valve opening and closing, change of working conditions and emergency shutdown of accidents also frequently cause vibration of pumping stations and generating units.

4, hydraulic and other aspects

Inconsistent design of the inflow channel of the unit or its incompatibility with the unit, improper depth of inundation of the pump, unreasonable sequence of starting and stopping of the unit, etc. will worsen the influent conditions, generate whirlpool, induce cavitation or aggravate the vibration of the unit and pump room. If the unit with damaging siphon vacuum cut-off is in operation, if the air in the hump section is entangled with air, it will take too long to form a siphon; Water pump and motor base uneven subsidence or the basis of the poor rigidity and other reasons, will lead to unit vibration.

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