1. Impeller flow blockage
When there is a foreign body in the impeller channel blockage, will cause the impeller stress, the stress of each part, it will cause the pump vibration.
2. Bearing damage or does not match
If the bearing is damaged, in addition to its own operating noise increases, the rotor will lose stability, will cause the pump unit vibration and noise increases. In addition, bearing radial clearance is too large, it may lead to a noise.
3. Pipeline pump installation problems
Such as pipeline pump and the base, the base and the foundation such as loose coupling phenomenon, motor and pump link coaxial degree on the low side, may generate vibration and noise, need to re tighten the bolts, or re calibration. In addition, the transmission medium conditions need to be controlled, can not appear bad vortex belt, the medium can not contain gas, otherwise it may cause the unit to produce abnormal vibration and noise.
Measures to prevent and mitigate the vibration caused by the hydraulic shock
A. Appropriately increasing the outer diameter of the impeller and pump casing tongue distance, i.e. the gap increase leaf round outlet.
B. Change the flow path of the line, as far as possible to avoid abrupt changes in the flow direction of the flow channel area, in order to ease the adverse impact of the impact of water.
C. In multistage pipeline pump installation should be at all levels of the impeller blade outlet edge are staggered at the end. At the same time, the guide blade assembly position do not overlap, and should be according to a certain order scattered layout, can reduce hydraulic pulse.
