Scroll compressor

Abstract

A scroll compressor includes a rotation shaft; a first scroll and a second scroll engaged with the first scroll to form a compression chamber between the second scroll and the first scroll. The second scroll includes a key recess. The scroll compressor includes an Oldham ring having a ring portion and a key portion protruding toward the key recess, from the ring portion. The key portion is coupled to the key recess in a sliding manner such that the second scroll orbits with respect to the first scroll. The scroll compressor also includes a wear preventing member installed between the key recess and the key portion. The second scroll includes an axial direction separation prevention groove formed by recessing one surface off the key recess. The wear preventing member includes an axial direction separation prevention portion held in place by the axial direction separation prevention groove.

What is claimed is: 
     
         1 . A scroll compressor, comprising:
 a rotation shaft;   a first scroll provided on one side of the rotation shaft;   a second scroll engaged with the first scroll to form a compression chamber between the second scroll and the first scroll, the second scroll including a key recess in a surface disposed opposite to a surface facing the first scroll;   an Oldham ring, including a ring portion and a key portion protruding from the ring portion toward the key recess, the key portion being configured to be slidingly coupled with the key recess such that the second scroll orbits with respect to the first scroll; and   a wear preventing member installed between the key recess in the second scroll and the key portion of the Oldham ring,   wherein the second scroll includes an axial direction separation prevention groove formed by recessing one surface of the key recess, and   wherein the wear preventing member includes an axial direction separation prevention portion disposed in the axial direction separation prevention groove, the wear preventing member being held in place by an unrecessed portion of the one surface of the key recess.   
     
     
         2 . The scroll compressor of  claim 1 ,
 wherein the Oldham ring is formed of the same material as the second scroll, and   wherein the wear preventing member is formed of material that is different from that of at least one of the key recess in the second scroll or the key portion of the Oldham ring.   
     
     
         3 . The scroll compressor of  claim 2 ,
 wherein the ring portion and the key portion are formed of the same material, and   wherein the ring portion and the key portion form a single integral body.   
     
     
         4 . The scroll compressor of  claim 1 ,wherein the wear preventing member further includes:
 first and second reinforcement plates that extend along a radial direction of the rotation shaft, the first and second reinforcement plates being positioned parallel to and spaced apart from each other, and   radial direction separation prevention portions protruding from respective ends of the first reinforcement plate and the second reinforcement plate, the radial direction separation preventing portions being configured to prevent the wear preventing member from being separated from the key recess along the radial direction of the rotation shaft.   
     
     
         5 . The scroll compressor of  claim 4 ,
 wherein the radial direction separation prevention portions are positioned closer to the rotation shaft than the first reinforcement plate or the second reinforcement plate.   
     
     
         6 . The scroll compressor of  claim 4 ,
 wherein each of the first reinforcement plate and the second reinforcement plate extends from a fixation end connected to a respective radial direction separation prevention portion to a free end, and   wherein the axial direction separation prevention portions are positioned adjacent the free ends of the first reinforcement plate and the free end of the second reinforcement plate, respectively, the axial direction separation prevention portions extending in a circumferential direction away from each other.   
     
     
         7 . The scroll compressor of  claim 6 ,
 wherein the key recess in the second scroll further includes
 a first side wall configured to be in close contact with the first reinforcement plate, 
 a second side wall spaced apart from the first side wall and configured to be kept in close contact with the second reinforcement plate, and 
 a bottom surface connecting the first side wall and the second wall along a circumferential direction of the rotation shaft, the bottom surface facing the key portion, and 
   wherein the axial direction separation prevention groove includes a pair of axial direction separation prevention grooves having a chamfer shape and extending between a convex outer surface of the second scroll and the first side wall, and between the convex outer surface of the second scroll and the second side wall.   
     
     
         8 . The scroll compressor of  claim 6 , wherein the axial direction separation prevention portion is formed by partially cutting the free ends of the first reinforcement plate and the second reinforcement plate in the radial direction of the rotation shaft. 
     
     
         9 . The scroll compressor of  claim 6 ,
 wherein each of the free ends of the first reinforcement plate and the free end of the second reinforcement plate includes
 a first part that extends along a direction of extension of the first reinforcement plate and the second reinforcement plate, and 
 a second part that extends from the first part to form the axial direction separation prevention portion, and 
   wherein the second part is positioned closer to a bottom surface of the key recess than the first part.   
     
     
         10 . The scroll compressor of  claim 9 , wherein the key recess in the second scroll further includes
 a first side wall configured to be kept in close contact with the first reinforcement plate,   a second side wall spaced apart from the first side wall and configured to be kept in close contact with the second reinforcement plate, and
 a bottom surface connecting the first side wall and the second wall to each other, the bottom surface facing the key portion, 
   wherein each of the first side wall and the second side wall is divided into a first part that is relatively remote, along the axial direction of the rotation shaft, from the bottom surface of the key recess, and a second part that is relatively close to the bottom surface of the key recess, and   wherein the axial direction separation prevention groove includes a pair of axial direction separation prevention grooves having a chamfer shape and extending between a convex outer surface of the second scroll and the second parts of the first side wall and the second side wall.   
     
     
         11 . The scroll compressor of  claim 4 ,
 wherein the radial direction separation prevention portion is connected to one end of the first reinforcement plate and one end of the second reinforcement plate so as to have a curved surface with a cross section of a circular arc,   wherein a diameter of a circle that corresponds to the circular arc is greater than a distance between the first reinforcement plate and the second reinforcement plate and   wherein a magnitude of a central angle of the circular arc is greater than 90°.   
     
     
         12 . The scroll compressor of  claim 11 ,
 wherein the key recess in the second scroll includes a radial direction separation prevention groove formed at a position relatively closer to the rotation shaft than the radial direction separation prevention groove or the key recess, and   wherein the radial direction separation prevention groove has a circular segment that corresponds to the circular arc so as to accommodate the radial direction separation prevention portion.   
     
     
         13 . The scroll compressor of  claim 4 ,
 wherein the axial direction separation prevention groove includes a recessed groove in the bottom surface of the key recess, the recessed grove extending along the radial direction of the rotation shaft,   wherein the recessed groove includes two side walls spaced apart from each other and extending obliquely away from each other in an axial direction towards the first scroll, and   wherein the axial direction separation prevention portion includes
 two inclination surfaces positioned obliquely to correspond to the two side walls of the axial direction separation prevention groove, respectively, and 
 a connection surface that connects the two inclination surfaces to each other. 
   
     
     
         14 . The scroll compressor of  claim 13 ,
 wherein the wear preventing member further includes a third reinforcement plate connecting the first reinforcement plate and the second reinforcement plate, the third reinforcement plate being configured to be positioned in close contact with the bottom surface of the key recess, and   wherein the axial direction separation prevention portion is formed on the third reinforcement plate or wherein the two inclination surfaces of the axial direction separation prevention portion extend between the first and second reinforcement plates, respectively, and the third reinforcement plate.   
     
     
         15 . The scroll compressor of  claim 13 ,
 wherein the radial direction separation prevention unit includes
 a first radial direction separation prevention portion connected to one end of the first reinforcement plate, and 
 a second radial direction separation prevention portion connected to one end of the second reinforcement plate, 
   wherein each of the first radial direction separation prevention portion and the second radial direction separation prevention portion extends from a fixation end connected to the one end of the first reinforcement or the one of the second reinforcement plate to a free end disposed opposite the respective fixation end, and   wherein the free end of the first radial direction separation prevention portion is spaced apart from the free end of the second radial direction separation prevention portion.   
     
     
         16 . The scroll compressor of  claim 15   wherein a maximum distance in a circumferential direction of the rotation shaft between the first radial direction separation prevention portion and the second radial direction separation prevention portion is longer than a distance between a first reinforcement plate and a second reinforcement plate.   
     
     
         17 . The scroll compressor of  claim 15   where each of the first radial direction separation prevention portion and the second radial direction separation prevention portion includes a curved surface with a cross section of a circular arc.   
     
     
         18 . The scroll compressor of  claim 15 ,
 wherein the first radial direction separation prevention portion includes a pair of first radial direction separation prevention portions extending from the first reinforcement plate along the circumferential direction of the rotation shaft,   wherein the second radial direction separation prevention portion includes a pair of second radial direction separation prevention portions extending from the second reinforcement plate along the circumferential direction of the rotation shaft,   wherein the pair of first radial direction separation prevention portions are respectively formed on both ends of the first reinforcement plate, and   wherein the pair of second radial direction separation prevention portions are formed on both ends of the second reinforcement plate.   
     
     
         19 . The scroll compressor of  claim 18 ,
 wherein the pair of first radial direction separation prevention portions are parallel to each other along the radial direction of the rotations shaft, and   wherein the pair of second radial direction separation prevention portions are parallel to each other along the radial direction of the rotation shaft.   
     
     
         20 . The scroll compressor of  claim 1 ,
 wherein the wear preventing member further includes:
 a first reinforcement plate and a second reinforcement plate that extend in parallel to each other along a radial direction of the rotation shaft, the first reinforcement plate being spaced apart from the second reinforcement plate; and 
 a third reinforcement plate configured to be kept in close contact with the key recess, extending in a circumferential direction of the rotation shaft, and connecting the first reinforcement plate and the second reinforcement plate, 
   wherein the axial direction separation prevention portion includes a fastening hole formed in the third reinforcement plate,   wherein the axial direction separation prevention groove is formed in a position axially aligned with the fastening hole, and   wherein, the wear preventing member is held securely in the key recess with a fastening member that passes through the fastening hole into the axial direction separation prevention groove.