Hermetic compressor

Abstract

This hermetic compressor includes a regulation mechanism, which is arranged between a lower washer and an upper end face of a bearing, for regulating a movable distance in a thrust direction of the lower washer so that the movable distance can be shorter than clearance between an inner diameter of the lower washer and an outer diameter of a main shaft portion. It is possible to prevent the inner diameter of the lower washer from coming into contact with the outer diameter of the main shaft portion by this regulation mechanism.

1 . A hermetic compressor comprising:
 an electrically driving element having a stator and a rotor, the electrically driving element being accommodated in a hermetic container; and   a compression element driven by the electrically driving element, the compression element being accommodated in the hermetic container,   the compression element comprising:
 a shaft; 
 a cylinder block forming a compression chamber; 
 a bearing for supporting the shaft, arranged in the cylinder block; 
 a piston reciprocated in the compression chamber; 
 a connecting portion for connecting the piston with an eccentric shaft portion; and 
 a thrust ball bearing, 
   the thrust ball bearing comprising:
 a plurality of balls; 
 a holder portion for holding the balls; 
 an upper washer arranged above the balls; and 
 a lower washer arranged below the balls, 
   the hermetic compressor further comprising a regulation mechanism for regulating the lower washer so that a movable distance in the thrust direction of the lower washer can be shorter than clearance formed between an inner diameter of the lower washer and an outer diameter of the main shaft portion.   
     
     
         2 . The hermetic compressor of  claim 1 ,
 wherein the shaft comprises a main shaft portion and an eccentric shaft portion formed through a flange portion; and   wherein the thrust ball bearing is arranged between the flange portion and an upper end face of the bearing.   
     
     
         3 . The hermetic compressor of  claim 2 ,
 wherein the regulation mechanism comprises a first cylindrical wall, which is arranged in the cylinder block or the bearing, surrounding the outside of the lower washer; and   wherein clearance between an outer diameter of the lower washer and an inner diameter of the first cylindrical wall is smaller than clearance between an inner diameter of the lower washer and an outer diameter of the main shaft portion.   
     
     
         4 . The hermetic compressor of  claim 2 ,
 wherein the regulation mechanism comprises a first recess portion and a first protruding portion which are idly engaged with each other and respectively arranged on the lower washer and the upper end face of the bearing; and   wherein clearance in the thrust direction between the first recess portion and the first protruding portion is smaller than clearance between an inner diameter of the lower washer and an outer diameter of the main shaft portion.   
     
     
         5 . The hermetic compressor of  claim 2 ,
 wherein the regulation mechanism comprises a first bent portion on an outer circumference of the lower washer; and   wherein clearance in the thrust direction between an inner circumferential face of the first bent portion and an outer diameter of the bearing is smaller than clearance between an inner diameter of the lower washer and an outer diameter of the main shaft portion.   
     
     
         6 . The hermetic compressor of  claim 2 ,
 wherein the regulation mechanism comprises a first annular protruding portion arranged inside an upper end face of the bearing; and   wherein the first annular protruding portion and an inner circumference of the lower washer are idly engaged with each other.   
     
     
         7 . The hermetic compressor of  claim 1 ,
 wherein the shaft comprises a main shaft portion to which the eccentric shaft portion and the rotor are fixed; and   wherein the thrust ball bearing is arranged between an upper end face of the bearing and the rotor fixed to the main shaft portion.   
     
     
         8 . The hermetic compressor of  claim 7 ,
 wherein a second cylindrical wall for surrounding the outside of the lower washer is provided in an upper portion of the bearing; and   wherein the regulation mechanism is composed in such a manner that clearance between an outer diameter of the lower washer and an inner diameter of the second cylindrical wall is smaller than clearance between an inner diameter of the lower washer and an outer diameter of the main shaft portion.   
     
     
         9 . The hermetic compressor of  claim 7 ,
 wherein the regulation mechanism comprises a second recess portion and a second protruding portion which are idly engaged with each other and respectively arranged on the lower washer and the upper end face of the bearing; and   wherein clearance in the thrust direction between the second recess portion and the second protruding portion is smaller than clearance between an inner diameter of the lower washer and an outer diameter of the main shaft portion.   
     
     
         10 . The hermetic compressor of  claim 7 ,
 wherein the regulation mechanism comprises a second bent portion on an outer circumference of the lower washer; and   wherein clearance in the thrust direction between an inner circumferential face of the second bent portion and an outer diameter of the bearing is smaller than clearance between an inner diameter of the lower washer and an outer diameter of the main shaft portion.   
     
     
         11 . The hermetic compressor of  claim 7 ,
 wherein the regulation mechanism comprises a second annular protruding portion arranged inside an upper end face of the bearing; and   wherein the second annular protruding portion and an inner circumference of the lower washer are idly engaged with each other.