核反应堆立式主泵泵轴涡动特性研究  

Pump Shaft Whirl Characteristic for Vertical Main Coolant Pump of Nuclear Reactor

作　　者：李振 王洪凯 袁少波[2] LI Zhen;WANG Hongkai;YUAN Shaobo(Fujian Fuqing Nuclear Power Co.,Ltd.Fuqing,350318,China;Nuclear Power Institute of China Chengdu,610213,China)

机构地区：[1]福建福清核电有限公司,福清350318 [2]中国核动力研究设计院,成都610213

出　　处：《振动．测试与诊断》2022年第6期1184-1188,1248,共6页Journal of Vibration,Measurement & Diagnosis

摘　　要：针对国内多个核电厂反应堆主泵存在泵轴不稳定涡动导致振动报警的问题,对涡动特性进行了深入研究。首先,对主泵轴进行了转子动力学分析;其次,对主泵振动包括涡动频率、涡动幅值等进行了测试,研究了泵轴涡动的原因及涡动源位置。结果表明:立式主泵轴系半频涡动频率略低于0.5倍频,在0.43~0.49倍频范围内变化;涡动幅值时高时低,但并不呈发散趋势,总体处于动态平衡;主泵轴振动波动的幅度主要由半频涡动的波动幅度决定;主泵轴系的半频涡动为泵轴下部轴承水膜涡动引起,非电机轴油膜涡动引起。为降低轴系涡动的影响,提出了泵轴下部轴承的优化建议。There is vibration alarm which is caused by unstable shaft whirl in main coolant pump of reactor in many nuclear power plants.It is necessary to research deeply for the whirl characteristic.Firstly,the rotor dy⁃namic of shaft in main coolant pump is analyzed.The frequency,amplitude and source location of whirl motion is measured and studied.The cause and the source of the whirl vibration for the shaft is investigated.The result shows that half whirl vibration frequency is slightly lower than 0.5 times the running frequency,and the whirl frequency vary in the range of 0.43~0.49 times the running frequency.As the amplitude of whirl motion is not constant,sometimes it is high,sometimes it is low.The divergent trend does not exist and the whirl is in dy⁃namic balance condition in total.The fluctuation of vibration is mainly determined by the amplitude variation of half whirl frequency.The pump shaft whirl is caused by the water film whirl of the bottom bearing,not by the oil film whirl of the motor shaft.In order to reduce the influence of the shaft whirl,it is suggested to modify the bottom bearing of pump shaft.

关 键 词：主泵 振动 涡动 立式 

分 类 号：TH113.1[机械工程—机械设计及理论] TM623[电气工程—电力系统及自动化] TB535[理学—物理]