核电厂用变频泵振动故障分析及治理

Analysis and Countermeasures of Vibration for Variable Frequency Pump in Nuclear Power Plants

某核电厂在调试过程中一台变频泵发生了某一频率范围内振动大的故障。振动大不利于该泵的长期运行,为此进行敲击试验得出该泵固有频率,并由振动频谱分析确定该泵为结构共振。利用结构共振理论给出了改变电机支架刚度或质量并通过有限元分析计算后调整固有频率的方法,使得变频泵在振动故障治理后振动明显变小且最终符合要求,为转动设备的故障诊断提供了重要参考。

During the startup process of a nuclear power plant, a variable frequency pump has a large vibration fault in a frequency range. The vibration is not conducive to the long-term operation of the pump, so a knocking test is carried out to get the natural frequency of the pump. It is determined by the vibration spectrum analysis that the pump occurs a structural resonance. Based on the theory of structural resonance, the method of changing the stiffness or mass of the motor support and calculating the natural frequency after the finite element analysis is given. Through this method, the vibration of the variable frequency pump after the treatment of the vibration fault is obviously smaller, and it can meet the requirements. This study provides an important reference for the fault diagnosis of rotating equipment.