Multiple -stage centrifugal pump

The utility model discloses a multiple -stage centrifugal pump, including main including the pump body, the pump shaft, the impeller, the balancing sleeve, the balancing disk, balanced ring, driveingend bearing support component and non - driveing end bearing support component, its characterized in that is equipped with cylindrical roller bearing and bearing apical ring, back bearing retainer inner wall is equipped with the location bulge loop, be equipped with the cylindrical roller bearing installation shaft shoulder on the pump shaft, cylindrical roller bearing inner race fixes on the cylindrical roller bearing installation shaft shoulder, outer lane and location bulge loop fixed connection, cylindrical roller bearing inner race is inner inconsistent with the bearing apical ring, the outer lane is corresponding with the angular contact ball bearing outer lane, the bearing apical ring other end and porose end cover fixed connection, porose end cover is through adjusting bolt bearingretainer fixed connection