Scroll compressor

Abstract

The present disclosure relates to a scroll compressor. According to the present disclosure, an oldham ring for preventing the rotation movement of a orbiting scroll may be fabricated by sintering metal powder to have a yield stress above 300 MPa, and thus even when a gas force is eccentrically generated it may be possible to prevent the oldham ring supporting the circular movement of the orbiting scroll from being damaged due to this, thereby enhancing the compressor performance.

What is claimed is: 
     
         1 . A scroll compressor, comprising:
 a fixed scroll having a fixed wrap;   a orbiting scroll configured to have a orbiting wrap engaged with the fixed wrap to form a first and a second compression chamber at an inner surface and an outer surface thereof, and perform a orbiting with respect to the fixed scroll;   a frame provided at an opposite side of the fixed scroll by interposing the orbiting scroll to support the orbiting scroll;   a rotation shaft configured to have an eccentric portion at an end portion thereof, and combined with the orbiting scroll such that the eccentric portion is overlapped with the orbiting wrap in a radial direction;   a driving unit configured to drive the rotation shaft; and   a rotation prevention member configured to prevent the rotation of the orbiting scroll,   wherein the rotation prevention member is formed to have a yield stress above 300 MPa.   
     
     
         2 . The scroll compressor of  claim 1 , wherein when the rotation prevention member is formed by sintering stainless steel powder. 
     
     
         3 . The scroll compressor of  claim 1 , wherein the first compression chamber is formed between two contact points (P 1 , P 2 ) generated when an inner surface of the fixed wrap and an outer surface of the orbiting wrap are brought into contact with each other, and
 when an angle having a greater value between angles made by two lines connecting the center (O) of the eccentric portion to the two contact points (P 1 , P 2 ), respectively, is α, α<360° at least prior to starting discharge.   
     
     
         4 . The scroll compressor of  claim 3 , wherein when a distance between perpendiculars at the two contact points (P 1 , P 2 ) is I, I>0. 
     
     
         5 . The scroll compressor of  claim 1 , wherein a rotation shaft combining portion combined with the eccentric portion at an inner portion thereof is formed at a central portion of the orbiting scroll, and
 a protrusion portion is formed at an inner circumferential surface of an inner end portion of the fixed wrap, and a concave portion brought into contact with the protrusion portion to form a compression chamber is formed at an outer circumferential surface of the rear surface combining portion.   
     
     
         6 . A scroll compressor, comprising:
 a fixed scroll having a fixed wrap to be protruded at a lateral surface of a end plate portion;   a orbiting scroll configured to have a orbiting wrap engaged with the fixed wrap to form a first and a second compression chamber at an inner surface and an outer surface thereof at a lateral surface of the end plate portion, and perform a orbiting with respect to the fixed scroll;   a frame provided at an opposite side of the fixed scroll by interposing the orbiting scroll to support the orbiting scroll;   a rotation shaft configured to have an eccentric portion at an end portion thereof, and combined with the orbiting scroll such that the eccentric portion is overlapped with the orbiting wrap in a radial direction;   a driving unit configured to drive the rotation shaft; and   a rotation prevention member configured to prevent the rotation of the orbiting scroll,   wherein the rotation prevention member comprises:   a ring portion inserted into a rear surface of the end plate portion of the orbiting scroll;   a first key protruded from a lateral surface of the ring portion to be inserted to into the fixed scroll; and   a second key protruded from a lateral surface of the ring portion at a predetermined distance from the first key to be inserted into the orbiting scroll.   
     
     
         7 . The scroll compressor of  claim 6 , wherein the first key is formed to be longer than the second key. 
     
     
         8 . The scroll compressor of  claim 7 , wherein the first key is formed to be protruded longer than the thickness of an outer circumferential side of the end plate portion of the orbiting scroll. 
     
     
         9 . The scroll compressor of  claim 6 , wherein the first key is formed to be extended from an outer circumferential surface of the ring portion to the outside thereof and bent in the direction of fixed scroll. 
     
     
         10 . The scroll compressor of  claim 6 , wherein the second key is formed such that an outer circumferential surface of the ring portion and a surface brought into contact with the orbiting scroll are continuously made. 
     
     
         11 . The scroll compressor of  claim 6 , wherein a first key groove into which the first key is inserted is formed at the fixed scroll, and
 the first key groove is continuously formed over an upper end of the side wall portion of the fixed scroll and a support portion supporting the orbiting scroll.   
     
     
         12 . The scroll compressor of  claim 11 , wherein the first key groove comprises:
 a vertical portion extended in the upward direction; and   a horizontal portion extended in the left/right direction from the vertical portion.   
     
     
         13 . The scroll compressor of  claim 6 , wherein a second key groove into which the second key is inserted is formed at the orbiting scroll, and
 the second key groove is formed at an outer circumferential portion of the end plate portion of the orbiting scroll.   
     
     
         14 . The scroll compressor of  claim 6 , wherein the rotation prevention member is formed to have a yield stress above 300 MPa. 
     
     
         15 . The scroll compressor of  claim 14 , wherein when the rotation prevention member is formed by sintering stainless steel powder. 
     
     
         16 . The scroll compressor of  claim 14 , wherein the first compression chamber is formed between two contact points (P 1 , P 2 ) generated when an inner surface of the fixed wrap and an outer surface of the orbiting wrap are brought into contact with each other, and
 when an angle having a greater value between angles made by two lines connecting the center (O) of the eccentric portion to the two contact points (P 1 , P 2 ), respectively, is α, α<360° at least prior to starting discharge.   
     
     
         17 . The scroll compressor of  claim 16 , wherein when a distance between perpendiculars at the two contact points (P 1 , P 2 ) is I, I>0. 
     
     
         18 . The scroll compressor of  claim 6 , wherein a rotation shaft combining portion combined with the eccentric portion at an inner portion thereof is formed at a central portion of the orbiting scroll, and
 a protrusion portion is formed at an inner circumferential surface of an inner end portion of the fixed wrap, and a concave portion brought into contact with the protrusion portion to form a compression chamber is formed at an outer circumferential surface of the rear surface combining portion.