Hermetic compressor

Abstract

A hermetic compressor including a drive unit, a piston, a rotating shaft including an eccentric shaft portion and a weight balance portion located below the eccentric shaft portion, and an oil flow path having an upper oil hole formed in the rotating shaft and adapted to allow oil to be suctioned upward and dispersed to the upper side of the eccentric shaft portion and an auxiliary oil hole to allow a part of the oil being suctioned upward along the upper oil hole to be supplied into a gap between the eccentric shaft portion and the connecting rod. The eccentric shaft portion is installed with a plug member to close an upper end of the upper oil hole. The plug member is configured to selectively couple a weight balance member, which is separately fabricated from the rotating shaft, to an upper end of the eccentric shaft portion.

1 . A hermetic compressor comprising:
 a drive unit;   a piston to compress a refrigerant upon receiving power from the drive unit;   a rotating shaft adapted to be rotated during operation of the drive unit and including an eccentric shaft portion provided at an upper end thereof so as to be connected to the piston via a connecting rod and a weight balance portion located below the eccentric shaft portion so as to compensate for rotation unbalance caused by the eccentric shaft portion; and   an oil flow path having an upper oil hole formed in the rotating shaft and adapted to allow oil to be suctioned upward and dispersed to the upper side of the eccentric shaft portion and an auxiliary oil hole to allow a part of the oil suctioned upward along the upper oil hole to be supplied into a gap between the eccentric shaft portion and the connecting rod,   wherein the eccentric shaft portion is installed with a plug member to close an upper end of the upper oil hole, and the plug member is configured to selectively couple a weight balance member, which is separately fabricated from the rotating shaft, to an upper end of the eccentric shaft portion.   
   
   
       2 . The hermetic compressor according to  claim 1 , wherein the plug member comprises a fastening portion formed, at an outer periphery thereof, with a male screw, and a female screw is processed at an inner periphery of an upper portion of the upper oil hole so as to define a fastening hole for the coupling of the fastening portion. 
   
   
       3 . The hermetic compressor according to  claim 2 ,
 wherein the plug member further comprises a plug portion provided at a top of the fastening portion and configured to come into close contact with the upper end of the eccentric shaft portion around the upper oil hole, for closing the upper oil hole,   wherein the weight balance member has a coupling hole for penetration of the fastening portion, and   wherein the weight balance member is secured between the upper end of the eccentric shaft portion and the plug portion as the fastening portion, penetrating the coupling hole, is fastened to the fastening hole.   
   
   
       4 . The hermetic compressor according to  claim 3 , wherein lengths of the fastening portion and the fastening hole are determined such that the plug portion comes into close contact with the upper end of the eccentric shaft portion even in a state in which the weight balance member is removed. 
   
   
       5 . The hermetic compressor according to  claim 1 , wherein the connecting rod comprises a large-diameter portion configured to enclose the eccentric shaft portion, the connecting rod being connected to the eccentric shaft portion via the large-diameter portion, and an upper end of the large-diameter portion is spaced apart from a lower end of the weight balance member. 
   
   
       6 . The hermetic compressor according to  claim 1 , wherein the plug member is a fixing bolt.