Why pump vibration was badly

Pump in the operation of why the vibration, many people are worried, then we look at the reasons for the next pump vibration.

 

Pump vibration of the powerful reasons:

First, the mechanical side

   Vibration can be felt out, hand touch the motor side, the pump head side, if only the motor vibration, it may couplings, or motor bearing problems. If only the pump head vibration, it may pump head bearings, mechanical seals, or impeller nut, or cavitation and other reasons. If the overall vibration, check the foot, you can also listen to the ear close to different parts, usually in the fault location to hear the more obvious noise. If you see the machine seal leakage, the possibility of mechanical seal burn out. Or the quality of the motor and pump rotating parts imbalance, shoddy, poor installation quality, the unit axis asymmetry, swing over the allowable value of parts of the mechanical strength and poor rigidity, bearing and seal components wear and tear, and the pump critical speed appears and The natural frequency of the unit has been caused by the resonance, will have a strong vibration and noise. 1, first check the foundation is fixed, base bolts are loose; 2, the impeller lock mother is loose; 3, the coupling is good; 4, the spindle is bent; 5, pump and motor bearings run outside, 8, also depends on the situation of the material, whether the viscosity is too large; 9, the suction tube is not too large; 9, the suction tube is not too strong; Or whether the filter is blocked; 10, suction pipe is too shallow into the liquid surface.

Second, the hydraulic aspects

   Pump inlet flow velocity and pressure distribution is not uniform, the pump inlet and outlet working fluid pressure pulsation, liquid flow, bias and flow, non-rated conditions and a variety of reasons such as pump cavitation, are common cause pump unit vibration s reason. Pump start-up and shutdown, valve opening and closing, changes in working conditions and emergency shutdown and other dynamic transition process caused by rapid changes in water pressure within the pipeline and water hammer, etc., often lead to pump and unit vibration.

Third, the electrical aspects

   Motor is the main equipment unit, the motor internal magnetic imbalance and other electrical system disorders, often caused by vibration and noise. If the asynchronous motor in operation, stator and rotor by the harmonic magnetic flux interaction between the stator and rotor radial alternating magnetic tension, or large-scale synchronous motor in operation, the rotor magnetic center is inconsistent or in all directions air gap Exceeding the allowable deviation value, etc., may cause the motor to periodically vibrate and make noise. Check whether the three-phase motor is running balance, check the power frequency is stable.

Fourth, water aspects

   The design of the inlet passage is unreasonable or does not match with the unit, the submergence depth of the pump is improper, and the sequence of starting and stopping of the unit is unreasonable, which will make the water condition deteriorate, produce vortex, induce cavitation or aggravate the vibration of unit and pump house. When the siphon vacuum interrupting unit is used, if the humping air is difficult to be carried, the siphon time is too long; when the shutter door is broken, the unit door design is unreasonable; when it is closed, it constantly hits the door; Pump and motor base uneven subsidence or poor rigidity of the foundation and other reasons, will also lead to unit vibration.

Fifth, the process

1, check whether the pump in the design of the Ministry of Industry and run: head, flow, water temperature, vacuum suction height, etc. (is present in the cavitation conditions).

2, check the pump inlet and outlet valves are intact.

3, check the water is entrained with air or other gases.

4, check the pump outlet pipeline is not exhausted the existence of the phenomenon of air.

5, check the pump inlet leak.