Abstract: In view of the working principle and daily operation of the emergency displacement pump and the fault characteristics that bearings are prone to high temperature failure since it was put into operation,the lubrication and cooling environment of the whole operation of the pump set was optimized and improved after the implementation of temporary solution measures,on-site fault analysis,bearing housing expansion,installation of cooling water system and other optimization and modification work. By comparing the operating effect difference before and after optimization and the temperature of the bearings at both ends of the pump body,the bearing temperature of the emergency displacement pump after optimization and modification is significantly reduced,which can meet the requirements of long-term operation. The application effect of the bearing housing after optimization and modification is verified through the actual case,which provides a theoretical reference for the pump working condition optimization and fault maintenance of such emergency displacement pump in the future.

Key words: emergency displacement pump, bearing high temperature, bearing, optimal design