循环水泵动态镜板翘曲故障诊断及振动评价讨论

Diagnosis on Failure of Dynamic Warping of Circulating Water Pump's Mirror Plate and Discussion on Vibration Evaluation

循环水泵-电机系统存在2倍频为主的不稳定振动问题,且电机冷却方式对其振动特性有显著影响。针对该故障开展现场测试,诊断并验证了电机在特定工况下发生动态镜板翘曲故障。对镜板翘曲故障进行机理分析得出,轴段轴线不重合导致产生2倍频振动,轴线不重合故障的集中度决定了运行设备中表现出的主振频率,低频振动信号在振动速度积分成振动位移过程中放大,推荐低速设备非旋转部件振动采用振动速度进行评价。

The unstable vibration on the 2nd harmonic has been existing in the pump-motor system,and the way to cool the motor has a significant effect on its vibration characteristics.Therefore,the field testing for this fault has been taken to diagnose and verify the failure of dynamic mirror plate warping of the motor under certain conditions.The analysis on the mechanism of the mirror warping failure concludes that it is the axial misalignment that leads to double frequency vibration.The concentration of the axial misalignment determines the dominant frequency of the operating equipment.The low-frequency vibration signal is amplified into the vibration displacement during the integration of the vibration velocity.At the end,it is suggested that the vibration velocity should be used to evaluate the vibration of the non-rotating parts of the low-speed equipment.