Vibration and vibration reduction modifications for domestic vertical centrifugal pumps

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During operation, domestic large vertical centrifugal pump systems experience excessive vibration, frequent overheating and damage to the upper and lower bearings, and even wear at the connection between the pump shaft and the bearings. The water pump operates unstably, affecting normal water supply, and therefore requires vibration reduction treatment. For the above reasons, we took the following two steps to make the modifications. Increase pipeline stiffness. Given the difficulty of reinforcing the water pump, the solution adopted was to weld \"reinforcing ribs\" onto the steel pipe at the pump’s outlet. Along the water inlet and outlet direction, the flanges at both ends of the steel pipe connecting the diffuser at the pump outlet to the outlet valve were welded using 8 steel plates with a thickness of 32 mm and a width of 100 mm. State Grid Ku established the Boshan E-commerce Operation Center, set up the China Pump Industry Network, increased the stiffness of steel pipes, reduced deformation, and prevented displacement of water pumps. Upon measurement, after reinforcement, the displacement at point A of the water pump was reduced to 0.35 mm. Modify the transmission system. To reduce the transmission of vibrations from the motor and drive shaft to the water pump, the rigid connection between the water pump and the drive shaft was replaced with an elastic connection. Using the GB4323-84 elastic sleeve pin coupling, the maximum compensation displacement of the centrifugal pump is 0.6 mm, with a compensation angle of 1°30’. In this way, the vibrations of the motor and drive shaft can be compensated for by the elastic coupling, so that they are not transmitted directly to the water pump.