核主泵轴承重载惰转停机承载性能研究  

Study on Bearing Performance of Nuclear Main Pump Bearing Upon Stop of Heavy-duty Idler

作　　者：刘小军 陶邵佳 张亚宾 周忺骄 李盼 苏先顺[3] Liu Xiaojun;Tao Shaojia;Zhang Yabin;Zhou Xianjiao;Li Pan;Su Xianshun(Hunan SUND Industrial&Technological Co.,Ltd.,Xiangtan 411102,China;Shenyang Blower Works Group Corporation,Shenyang 100869,China;Nuclear Power Institute of China,Chengdu 610000,China)

机构地区：[1]湖南崇德工业科技有限公司,湖南湘潭411102 [2]沈阳鼓风机集团有限公司,沈阳100869 [3]中国核动力研究设计院,成都610000

出　　处：《流体机械》2019年第10期51-54,88,共5页Fluid Machinery

摘　　要：以某核主泵轴承为研究对象,针对其在重载惰转停机期间出现的主推力瓦磨损现象,指出了原轴承结构设计的不足,从轴承润滑理论出发,采用了DyRoBeS润滑计算软件,对主推力瓦惰转停机过程中的油膜厚度进行了分析。通过对推力瓦支点进行优化,并与原设计进行了对比分析,并进行了性能试验,验证了新设计的可靠性,为其他核主泵轴承的优化设计提供了一定的参考。结果表明:原推力瓦存在磨损的原因是瓦面面积不足且支点位置不合理,导致油膜厚度不够,在300 r/min时便进入边界润滑状态,导致了很大的磨损风险。在支点位置改进之后,轴承的停机性能较之前有了明显的提高,有效避免了重载惰转停机过程中产生的严重磨损。By taking a nuclear main pump bearing as the research object,the deficiencies of the original bearing structure design were pointed out for wear phenomenon of its main thrust pad occurring during the stop of the heavy-duty idler,and starting from the bearing lubrication theory,the oil film thickness of the main thrust pad in the stop process of heavy-duty idler was analyzed using DyRoBeS lubrication calculation software.The fulcrum of the thrust pad was optimized,and was compared with the original design,and also the performance test was carried out,which verifies the reliability of the new design,provides a certain reference for optimization design of other nuclear main pump bearings.The results show that the cause of wear of the original thrust pad lies in insufficient area of the thrust pad surface and unreasonable position of the fulcrum,which causes insufficient oil film thickness,making it enter into boundary lubrication condition at the rotating speed of 300 r/min and leading to great wear and tear.After the improvement of the fulcrum position,the shutdown performance of the bearing was significantly improved compared to the previous one,which effectively avoids the serious wear during the stop of heavy-duty idler.

关 键 词：核主泵轴承 重载惰转停机 推力瓦磨损 结构改进 

分 类 号：TH133.3[机械工程—机械制造及自动化]