Analysis faults and solution of pump's vibration

Lead the unit and the pump house building vibration caused by many reasons, some factors between both interrelated and interact with each other. And summed up mainly the following four aspects.

The motor is the main equipment of the unit, the imbalance of the internal magnetic force and other electrical systems, often cause vibration and noise. Such as asynchronous motor in operation, rotor radial alternating magnetic force produced by the stator and rotor tooth harmonic flux interactions, or large synchronous motor in operation, to the center of the rotor magnetic inconsistent or all directions air gap difference exceeds the allowable deviation value, may and noise caused the motor cycle of vibration.

Motor and pump rotation parts quality imbalance, shoddy, installation of poor quality, asymmetric unit axis, a swing degree exceeds the allowable value, parts of mechanical strength and poor stiffness, bearing and sealing parts wear and damage, and the critical speed of the pump appears and unit inherent frequency rate has been caused by the resonance, will produce strong vibration and noise.

Pump inlet velocity and pressure distribution is not uniform pump import and export liquid pressure pulsation, liquid flow around and drift and flow separation, non fixed conditions and a variety of causes of pump cavitation, etc. are a common cause of the vibration of the pump unit. Pump start and shutdown, the valves open and close, changing working condition and accident emergency stop dynamic transition process caused by pipeline the rapid change of the pressure and the water hammer effect, often lead to vibration of the pump and crew.

Set inlet flow design unreasonable or does not match with the unit, a water pump submerged depth properly, and the unit startup and shutdown order is not reasonable etc., so that the deterioration of water conditions, vortices, induced cavitation or aggravate unit and pump vibration. The damage siphon vacuum drying unit in startup, if hump section of the air entrainment difficult to form a long siphon; beat the door cutout of the unit take door design unreasonable, open and closed, continue to impact the flap valve seat; foundation to support the pump and motor occurred uneven settlement or foundation of rigid poor reasons, will also lead to unit vibration.