Water pump vibration analysis of the four reasons

Causes and reasons that cause vibration of the pump house building is more, both contact and interaction between some factors and the following sum up basically has the following four aspects.

1, the electrical

Motor is the main equipment units, the internal magnetic imbalance and other electrical system disorders, often cause vibration and noise. Such as asynchronous motor in operation, the stator tooth harmonic magnetic flux interactions among stator radial alternating magnetic force, or a large synchronous motor in operation, the stator magnetic center inconsistent or air gap difference exceeds allowable deviation value in all directions, etc., can cause motor periodic vibration and noises.

2, mechanical aspects

Motor and pump moving parts mass unbalance, churning out, installation quality bad, asymmetric unit axis, the pendulum degrees more than permitted, poor mechanical strength and stiffness of the parts, bearings and sealing parts wear damage, natural frequencies and critical speed of pump and the unit has been caused by the resonance, and so on, will produce strong vibration and noise.

3, the hydraulic

Import uneven distribution of flow velocity and pressure pump, pump working liquid pressure pulsation, import and export flow, bias current and flow, the working condition of quota and the various causes of water pump cavitation, etc., are common causes of pump unit vibration. To start and stop of pump, valve opening and closing, condition change and transition process of the accident emergency stop etc., caused by the rapid changes in the pressure in the water pipe and the water hammer effect and so on, also often result in pump room and vibration unit.

4, hydraulic, and other aspects

Unit feed water flow design is not reasonable or not form a complete set, water pump unit and submerged depth, as well as the process start and stop order is not reasonable, etc., will worsen the water conditions, produce whirlpool, induced cavitation or aggravate the unit vibration and the pump house. The damage siphon vacuum block unit at startup, if gravity hump air entrainment is difficult, form siphon time is too long; Flap gate unit pat door design is unreasonable, sometimes closed constantly hit flap valve seat; Support of the pump and motor foundation uneven settlement or foundation rigidity were some reasons, will also lead to unit vibration.