离心泵机组振动故障诊断与分析

针对某离心泵机组振动严重超标,影响服务寿命等问题,借助北京京航公司HG8908C多通道数据采集系统进行振动速度数据采集,对其振动信号进行幅域、时域分析,并运用快速傅里叶变换(FFT)信号分析方法对其频域信号特征结构进行了细化分析,并结合以往典型振动故障案例数据库,给出了该泵组由于转子部件与壳体部件间动静口环摩擦及平衡水管支撑刚度不足引起的振动故障,与拆检解体结果完全吻合.最后通过有限元计算泵转子静弯曲挠度控制转子的安装抬升余量,增加平衡水管厚度及对其焊接斜拉支撑等措施,有效地解决了该泵组振动超标问题,处理后的泵组振动信号稳定,周期性明显,频率结构正常.试验结果表明,此方案能够较好地解决离心泵机组振动故障问题,对于离心泵机组类似振动故障问题的诊断方法及处理措施具有一定参考价值.

Vibration test and analysis on the centrifugal pump

The vibration test and analysis is difficult to be conducted, and the valid ways are still lack, which causes many centrifugal pumps to exceed the standard vibration in a big potential risk. In order to solve the problem, the HG8908C, a vibration data collection system of Beijing Jinghang, was used to monitor the vibration signal on the centrifugal pump manufactured by Chongqing Pumps Company. The vibration signal characteristic of amplitude domain, time domain and frequency domain were analyzed in detail by fast fourier transforms(FFT). Besides, combined with the typical database of vibration faults, the faults, such as the friction fault between pump rotor and casing, and the poor supporting stiffness on pipe by balancing axis force(PBAF), were diagnosed. Based on the above mentioned diagnostic outcome and the static bending deflection of pump rator by FEM, the install center of pump rotor was adjusted, the thickness of PBAF was increased, the support as welded among PBAF and pump body and other solutions were carried out. The test results show that the solution ways have a positive effect on it, and the pump can work for hours in a good state. The test results show that the fault diagnosis methods and the solution ways can solve better the matters of vibration faults on the centrifugal pumps, which is of a certain value to the similar problems.