Scroll compressor

Abstract

A scroll compressor configured in such a manner that a back pressure chamber is formed on the back surface side of the movable scroll using an annular seal means, and pressurized fluid is introduced into the back pressure chamber through a pressure introduction hole. A thrust bearing member which is a separate member from the seal means and bears a thrust force acting toward the main bearing member from the bottom plate section side of the movable scroll is disposed between the back surface of the bottom plate section of the movable scroll and the front surface of the main bearing member which faces the back surface of the bottom plate section. The scroll compressor is configured in such a manner that the scroll compressor can satisfy the demand for more compactness and that a reduction in the durability and sealing function of the annular seal means can be minimized.

1 . A scroll compressor, which has a scroll type compression mechanism consisting of a fixed scroll and a movable scroll to swing relatively to the fixed scroll and which comprises
 a shaft having an eccentric crank part on an end and driving the movable scroll by the crank part,   a main bearing member to rotatably support the shaft through a main bearing,   a rotation preventing mechanism which is provided between a back face of a bottom plate part of the movable scroll and a front face of the main bearing member facing the back face and which prevents the movable scroll from rotating,   a back pressure chamber formed as a space between the back face of the bottom plate part of the movable scroll and the front face of the main bearing member facing the back face,   at least one annular groove formed on a side either of the back face of the bottom plate part of the movable scroll or the front face of the main bearing member,   a seal means which is movably attached in the annular groove and which is brought into sliding contact with another side,   a shaft seal means attached between the shaft and the main bearing member, and   a pressure inlet hole through which a pressurized fluid is supplied into the back pressure chamber as a sealed space sealed by the seal means and the shaft seal means, characterized in that   a thrust bearing member, which bears a thrust force subjected from the bottom plate side of the movable scroll to the main bearing member side, is interposed as a member other than the seal means.   
     
     
         2 . The scroll compressor according to  claim 1 , wherein the thrust bearing member is interposed such that the bottom plate part of the movable scroll contacts the thrust bearing member when the compressor starts up and the bottom plate part doesn't contact thrust bearing members in a steady operation. 
     
     
         3 . The scroll compressor according to  claim 1 , wherein the thrust bearing member is made of a plate member which annularly extends on the front face of the main bearing member in a circumferential direction. 
     
     
         4 . The scroll compressor according to  claim 1 , wherein the thrust bearing member is made of a plurality of circular members which are formed on the front face of the main bearing member and which are freely fitted in a plurality of circular grooves placed intermittently in the circumferential direction. 
     
     
         5 . The scroll compressor according to  claim 1 , wherein the thrust bearing member is made of metal or resin being of abrasion resistance. 
     
     
         6 . The scroll compressor according to  claim 1 , wherein the annular groove and the seal means are placed at a position including the rotation preventing mechanism in a radial direction. 
     
     
         7 . The scroll compressor according to  claim 1 , wherein the compressor is mounted in an air-conditioning system for vehicles.