Motor-operated compressor

Abstract

A motor-operated compressor includes: a fixed scroll; an orbiting scroll engaged with the fixed scroll to perform an orbiting motion and forming a pair of compression chambers together with the fixed scroll during the orbiting motion; a frame provided opposite to the fixed scroll with the orbiting scroll interposed therebetween, and forming a back pressure chamber so as to axially support the orbiting scroll; and a rotation shaft coupled to the frame and the orbiting scroll in a penetrating manner. The rotation shaft is supported by the frame in a first axial direction and rotatably coupled to the fixed scroll, and an elastic member is disposed between the fixed scroll and the rotation shaft to support the rotation shaft in a second axial direction opposite to the first axial direction with respect to the first scroll.

What is claimed is: 
     
         1 . A motor-operated compressor, comprising:
 a fixed scroll;   an orbiting scroll engaged with the fixed scroll and configured to perform an orbiting motion relative to the fixed scroll, and the orbiting scroll and the fixed scroll forming a pair of compression chambers therebetween during the orbiting motion;   a frame disposed opposite to the fixed scroll with the orbiting scroll interposed between the frame and the fixed scroll, a back pressure chamber being formed between the frame and the orbiting scroll, and the back pressure chamber being configured to axially support the orbiting scroll;   a rotation shaft coupled to the frame and the orbiting scroll and penetrating through the frame and the orbiting scroll, and the rotation shaft being supported on the frame in a first axial direction and rotatably coupled to the fixed scroll; and   an elastic member disposed between the fixed scroll and the rotation shaft, the elastic member being configured to support the rotation shaft in a second axial direction opposite to the first axial direction with respect to the fixed scroll.   
     
     
         2 . The motor-operated compressor of  claim 1 , wherein:
 the fixed scroll includes a rotation shaft receiving portion configured to accommodate at least a part of the rotation shaft, and   the elastic member is contained in the rotation shaft receiving portion.   
     
     
         3 . The motor-operated compressor of  claim 2 , wherein:
 the rotation shaft receiving portion includes a support surface facing an end portion of the rotation shaft, and   the elastic member is a coil spring having a first end supported by the end portion of the rotation shaft and a second end supported by the support surface.   
     
     
         4 . The motor-operated compressor of  claim 3 , wherein the support surface includes a recessed guide groove configured to receive the second end of the elastic member. 
     
     
         5 . The motor-operated compressor of  claim 4 , wherein:
 the end portion of the rotation shaft includes a protrusion portion extending in an axial direction from a center of the rotation shaft, and   the elastic member is coupled to the protrusion portion.   
     
     
         6 . The motor-operated compressor of  claim 3 , further comprising a bearing member disposed between the support surface and the elastic member. 
     
     
         7 . The motor-operated compressor of  claim 2 , wherein:
 the rotation shaft receiving portion includes an inner circumferential surface corresponding to an outer circumferential surface of the rotation shaft,   the inner circumferential surface includes a stepped mounting surface formed at a middle portion of the inner circumferential surface in an axial direction of the rotation shaft, and   the elastic member is a leaf spring having opposite sides of the leaf spring supported by the end portion of the rotation shaft and the mounting surface.   
     
     
         8 . The motor-operated compressor of  claim 7 , wherein the mounting surface is formed in a position facing the outer circumferential surface of the rotation shaft. 
     
     
         9 . The motor-operated compressor of  claim 1 , wherein:
 the rotation shaft includes a thrust portion extending in a radial direction,   the frame includes a frame shaft-receiving portion through which the rotation shaft passes, and   the thrust portion is supported on the frame shaft-receiving portion in the first axial direction.   
     
     
         10 . The motor-operated compressor of  claim 9 , wherein an annular sealing member is positioned between the thrust portion and the frame shaft-receiving portion. 
     
     
         11 . The motor-operated compressor of  claim 9 , wherein facing surfaces of the thrust portion and the frame shaft-receiving portion are tilted relative to the axial direction of the rotation shaft. 
     
     
         12 . The motor-operated compressor of  claim 11 , wherein an annular sealing member is interposed between the facing surfaces of the thrust portion and the frame shaft-receiving portion. 
     
     
         13 . The motor-operated compressor of  claim 11 , wherein a thrust bearing is interposed between the facing surfaces of the thrust portion and the frame shaft-receiving portion. 
     
     
         14 . A motor-operated compressor, comprising:
 a fixed scroll;   an orbiting scroll engaged with the fixed scroll and configured to perform an orbiting motion relative to the fixed scroll, the orbiting scroll and the fixed scroll forming a pair of compression chambers therebetween during the orbiting motion;   a frame disposed opposite to the fixed scroll with the orbiting scroll interposed between the frame and the fixed scroll, a back pressure chamber being formed between the frame and the orbiting scroll and configured to axially support the orbiting scroll, and the frame including a frame shaft-receiving portion;   a rotation shaft coupled to the frame and the orbiting scroll and penetrating through the frame and the orbiting scroll, with the rotation shaft including a thrust portion supported on the frame shaft-receiving portion in a first axial direction, the rotation shaft being rotatably coupled to the fixed scroll; and   a sealing member provided between the frame shaft-receiving portion of the frame and the thrust portion of the rotation shaft, the sealing member being configured to seal the back pressure chamber.   
     
     
         15 . The motor operated compressor of  claim 14 , wherein:
 the thrust portion includes an inclined surface relative to an axial direction of the rotation shaft, and   the frame shaft-receiving portion facing the inclined surface of the thrust portion includes a sealing surface formed along the inclined surface.   
     
     
         16 . A motor-operated compressor, comprising:
 a fixed scroll;   an orbiting scroll engaged with the fixed scroll and configured to perform an orbiting motion relative to the fixed scroll, and the orbiting scroll and the fixed scroll forming a pair of compression chambers therebetween during the orbiting motion;   a frame disposed opposite to the fixed scroll with the orbiting scroll interposed between the frame and the fixed scroll, a back pressure chamber being formed between the frame and the orbiting scroll, and the back pressure chamber being configured to axially support the orbiting scroll;   a rotation shaft coupled to the frame and the orbiting scroll and penetrating through the frame and the orbiting scroll, and the rotation shaft being supported on the frame in a first axial direction by a frame shaft-receiving portion of the frame and rotatably coupled to the fixed scroll, wherein the frame shaft-receiving portion mates with a thrust portion of the rotation shaft along facing surfaces of the frame shaft-receiving portion and the thrust portion of the rotation shaft that are inclined relative to a central axis of the rotation shaft; and   an elastic member disposed between the fixed scroll and the rotation shaft, the elastic member being configured to support the rotation shaft in a second axial direction opposite to the first axial direction with respect to the fixed scroll.   
     
     
         17 . The motor-operated compressor according to  claim 16 , wherein a thrust bearing member is disposed between at least a portion of the facing surfaces of the frame shaft-receiving portion and the thrust portion of the rotation shaft. 
     
     
         18 . The motor-operated compressor according to  claim 16 , wherein a sealing member is disposed between at least a portion of the facing surfaces of the frame shaft-receiving portion and the thrust portion of the rotation shaft. 
     
     
         19 . The motor-operated compressor according to  claim 16 , wherein:
 the fixed scroll includes a rotation shaft receiving portion configured to accommodate at least a part of the rotation shaft, and   the elastic member is contained in the rotation shaft receiving portion.   
     
     
         20 . The motor-operated compressor according to  claim 19 , wherein the elastic member is a spring.