There are many reasons for the vibration of the unit and the marine pump house, and there are connections and interactions between some factors. In summary, there are mainly the following four reasons.

The electrical motor is the main equipment of the unit. The internal magnetic imbalance of the motor and the imbalance of other electrical systems often cause vibration and noise. For example, when an asynchronous motor is in operation, the fixed-rotor inter-rotor alternating magnetic pull generated by the interaction of the fixed rotor tooth harmonic magnetic flux, or a large-scale synchronous motor is in operation, the fixed rotor magnetic center does not diverge, or the gap in each direction exceeds Allowable deviation values, etc., may cause periodic vibration and noise of the motor.

Mechanical motor and pump rotating parts are of unbalanced quality, shoddy, poor device quality, asymmetric unit axis, swing exceeding the allowable value, poor mechanical strength and rigidity of components, wear and tear of bearings and seal parts, critical rotation of the pump Resonance of speed and unit natural frequency is intense

In terms of hydraulics, the inlet and outlet flow rate and pressure distribution of the pump are not uniform. The pressure pulsation of the working fluid at the inlet and outlet of the pump, liquid bypass, deviation and de-flow, non-rated conditions, and vapor corrosion of the pump caused by various reasons are caused Common causes of pump unit vibration. Dynamic transition processes such as pump start and stop, valve opening and closing, situation change, emergency stop and other dynamic transitional processes, such as sudden pressure changes in water pipes and the action of hammers, cause pump rooms and units to often vibrate.

In hydraulic engineering and other aspects, the unit inlet flow channel design is unreasonable, does not cooperate with the unit, the pump engulfing depth is unreasonable, the unit start and stop times are unreasonable, etc., the water inlet condition deteriorates, whirlpools are generated, cavitation is induced, and the unit and marine bilge pump is aggravated Room vibration. When the unit that breaks the siphon vacuum cut-off is used to start, the air clamping belt in the hump section is difficult, and the design of the shutter door of the unit that constitutes the siphon time is too long. Uneven foundations of pumps and motors, poor foundation rigidity and other reasons can also cause unit vibration.