核电站RCV泵联轴器润滑脂发黑原因分析

Analysis of Blackening Causes of Grease in RCV Pump Coupling in Nuclear Power Plant

针对检修中发现部分RCV泵联轴器润滑脂出现发黑的问题,对在用脂进行光谱、铁谱及红外光谱分析,对联轴器进行电镜能谱、金相组织和硬度检测分析。结果表明,联轴器存在磨损,导致润滑脂中含有较多的金属磨损颗粒物,是造成润滑脂发黑的首要原因,次要原因是润滑脂的高温氧化。对联轴器进行润滑分析,结果表明,所用润滑脂的基础油黏度达不到AGMA标准中CG-2型齿轮联轴器对润滑脂基础油最低黏度要求,是导致联轴器出现高温升及异常磨损的主要原因。

In view of the blackening problem of some RCV pump couplings grease found during maintenance,relevant inspection and analysis were carried out.The results show that the primary cause of grease blackening is the presence of many metal wear particles in the grease,secondary cause is high temperature oxidation of grease.Through the relevant calculation and analysis,the reason for the temperature rise and abnormal of the coupling is found to be improperly selected lubricant.Specifically,the base oil viscosity of the currently using grease does not meet the minimum viscosity requirement of the CG-2 type gear coupling in the AGMA standard.