Independent oil cavity sealing structure for a submersible electric pump

Abstract

An independent oil cavity sealing structure for a submersible electric pump. The structure comprises a housing, upper and lower moving rings, upper and lower static rings, a transmission sleeve and upper and lower pressing plates; the housing is sleeved on the main shaft of the electric pump, the outer sides of the upper and lower static rings are supported on the upper and lower static ring supporting bosses through O-shaped rings respectively, the inner sides of the upper and lower static rings are tightly pressed by the O-shaped rings through the upper and lower pressing plates, the main shaft of the electric pump between the upper and lower static rings are fixedly connected with the transmission sleeve through bolts, upper and lower moving ring seats are provided in the cavity which is formed between the inner wall of the transmission sleeve and the main shaft of the electric pump.

1 . An independent oil cavity sealing structure for a submersible electric pump, comprising:
 a housing, upper and lower moving rings, upper and lower static rings, and a transmission sleeve,   wherein the independent oil cavity sealing structure further comprises:   upper and lower pressing plates, and   wherein: the housing is sleeved on the main shaft of the electric pump, the inner walls of upper and lower parts of the housing are provided with upper and lower static ring supporting bosses facing inwards respectively, the outer sides of the upper and lower static rings are supported on the upper and lower static ring supporting bosses through O-shaped rings respectively, the inner sides of the upper and lower static rings are tightly pressed by the O-shaped rings through the upper and lower pressing plates which are fixedly connected with the upper and lower inner walls of the housing, the main shaft of the electric pump between the upper and lower static rings are fixedly connected with the transmission sleeve through bolts, upper and lower moving ring seats are provided in the cavity which is formed between the inner wall of the transmission sleeve and the main shaft of the electric pump, a plurality of groups of springs provided in the axial direction of the main shaft of the electric pump abut against the part between the upper and lower moving ring seats, the upper and lower moving rings which are provided in the transmission sleeve are supported by the parts, opposite to each other, of the upper and lower moving ring seats through the O-shaped rings, and the upper and lower moving rings abut against the upper and lower static rings outwards respectively.   
     
     
         2 . The independent oil cavity sealing structure for a submersible electric pump according to  claim 1 , wherein:
 the housing comprises an upper housing cover plate and a lower housing cavity,   the upper and lower static ring supporting bosses are provided on the upper housing cover plate and the lower housing cavity, respectively, and   the upper housing cover plate is tightly connected to the end cover of the support bearing of the main shaft of the electric pump via a plurality of screws.   
     
     
         3 . The independent oil cavity sealing structure for a submersible electric pump according to  claim 1 , wherein:
 the spring sleeved on the main shaft of the electric pump in the axial direction of the main shaft of the electric pump abuts against the part between the upper and lower moving ring seats.   
     
     
         4 . The independent oil cavity sealing structure for a submersible electric pump according to  claim 1 , wherein the housing is filled with lubricant. 
     
     
         5 . The independent oil cavity sealing structure for a submersible electric pump according to  claim 2 , wherein the housing is filled with lubricant. 
     
     
         6 . The independent oil cavity sealing structure for a submersible electric pump according to  claim 3 , wherein the housing is filled with lubricant.