某循环海水泵振动故障诊断与趋势分析

Vibration Fault Diagnosis and Trend Analysis of Circulating Seawater Pump

针对某CPR1000核电机组因循环海水泵的下部滚动轴承振动大、存在紧急降负荷运行或停运的风险,开展了振动故障诊断与趋势分析。通过分析该BCV 285型循环海水泵运行中的振动尖峰能量信号和振动速度均方根信号,发现该轴承外环滚道存在局部剥落且发生共振是海水泵振动大的主要原因。通过采取强化轴承的润滑和加强基础刚度等措施,减小了海水泵的共振响应。实践表明,实时监测振动速度均方根值的变化趋势可以指导该型循环海水泵的安全运行。

Due to the high vibration of the lower rolling bearing of circulating seawater pump in a CPR1000 Nuclear power unit,there is a risk of emergency load reduction or shutdown.It is of great significance to car⁃ry out vibration fault diagnosis and trend analysis.By analyzing the signal and root mean square signal of vi⁃bration velocity of the BCV 285 circulating seawater pump in operation,it is found that the local spalling ex⁃ists in the outer ring raceway of the bearing,and the resonance is the main reason for the high vibration de⁃fect of the seawater pump.The resonace of the seawater pump is reduced by strengthening the lubrication of the bearing and the rigidity of the foundation.The practice shows that the real-time monitoring of the root mean square value of vibration velocity can guide the safe operation of the circulating seawater pump effec⁃tively.