Rotary compressor

Abstract

A rotary compressor according to the present embodiment comprises: a main bearing and a sub-bearing which are respectively provided on both sides of a cylinder in the axial direction and each provided with a guide groove; a roller which is accommodated in the cylinder and rotated along with a rotary shaft; at least one vane which is slidably inserted in the roller, and on which a guide protrusion that is slidably inserted in the guide groove in the circumferential direction is extended in the axial direction; and a bearing member which is provided between the guide groove of at least one bearing between the main bearing and the sub-bearing and the guide protrusion of the vane. As such, the frictional loss between the vane or the roller and the main bearing or the sub-bearing facing same can be reduced to improve the compressor efficiency.

1 . A rotary compressor comprising:
 a cylinder having an inner circumferential surface in an annular shape;   a main bearing and a sub bearing disposed on both sides of the cylinder in an axial direction to form a compression space together with the cylinder, and each having a guide groove on a side surface thereof forming the compression space;   a roller accommodated in the cylinder and rotating together with a rotating shaft;   at least one vane slidably inserted into the roller, and having a guide protrusion extending in the axial direction to be slidably inserted into the guide groove in a circumferential direction; and   a bearing member disposed between the guide groove of at least one of the main bearing and the sub bearing and the guide protrusion of the vane.   
     
     
         2 . The rotary compressor of  claim 1 , wherein the bearing member comprises:
 an outer ring inserted into an inner circumferential surface of the guide groove;   an inner ring disposed inside the outer ring, and having an inner circumferential surface slidably brought into contact with a contact surface of the guide protrusion; and   a sliding member disposed between the outer ring and the inner ring to allow a relative motion between the outer ring and the inner ring.   
     
     
         3 . The rotary compressor of  claim 2 , wherein one of the outer ring or the inner ring further comprises a rotating plate portion extending between the roller and the main bearing and the sub bearing facing the roller. 
     
     
         4 . The rotary compressor of  claim 1 , wherein the bearing member comprises:
 a first bearing portion disposed between at least one of the main bearing and the sub bearing and the vane facing the at least one bearing in a radial direction; and   a second bearing portion disposed between the at least one of the main bearing and the sub bearing and the roller facing the at least one bearing in an axial direction.   
     
     
         5 . The rotary compressor of  claim 4 , wherein the first bearing portion and the second bearing portion are formed integrally with each other. 
     
     
         6 . The rotary compressor of  claim 4 , wherein the second bearing portion is thicker than the first bearing portion. 
     
     
         7 . The rotary compressor of  claim 4 , wherein the first bearing portion is formed in an annular shape, and the second bearing part is formed in a disk shape. 
     
     
         8 . The rotary compressor of  claim 4 , wherein the first bearing portion comprises:
 an outer ring inserted into the guide groove of at least one of the main bearing and the sub bearing;   an inner ring disposed inside the outer ring, and having an inner circumferential surface slidably brought into contact with the guide protrusion of the vane; and   a sliding member disposed between the outer ring and the inner ring to allow a relative motion between the outer ring and the inner,   the second bearing portion extends radially from one end of the inner ring or the outer ring of the first bearing portion to be disposed on an axial side surface of the roller and an axial side surface of the at least one of the main bearing and the sub bearing facing the axial side surface of the roller.   
     
     
         9 . The rotary compressor of  claim 4 , wherein the second bearing portion is disposed such that an axial side surface thereof is spaced apart from an axial side surface of the main bearing or the sub bearing facing the same. 
     
     
         10 . The rotary compressor of  claim 4 , wherein the second bearing portion is inserted into the cylinder so that an outer circumferential surface thereof faces an inner circumferential surface of the cylinder. 
     
     
         11 . The rotary compressor of  claim 10 , wherein a sealing portion is disposed between the outer circumferential surface of the second bearing portion and the inner circumferential surface of the cylinder. 
     
     
         12 . The rotary compressor of  claim 10 , wherein the outer circumferential surface of the second bearing portion has the same shape as the inner circumferential surface of the cylinder. 
     
     
         13 . The rotary compressor of  claim 1 , wherein the bearing member is disposed between at least one of the main bearing and the sub bearing and the vane facing the at least one bearing in a radial direction, and
 an axial side surface of the roller is in sliding contact with an axial side surface of the main bearing and an axial side surface of the sub bearing facing the same.   
     
     
         14 . The rotary compressor of  claim 13 , wherein the inner circumferential surface of the cylinder is formed in a circular or elliptical shape, and
 a discharge port is formed in at least one of the axial side surface of the main bearing and the axial side surface of the sub bearing.   
     
     
         15 . The rotary compressor of any of  claims 1 to 14 , wherein bush grooves are formed in the roller, two swing bushes are rotatably inserted into the bush grooves, and the vane is slidably inserted between the swing bushes.