Scroll compressor

Abstract

The present disclosure relates to a scroll compressor. According to the present disclosure, in a shaft penetration scroll compressor in which an eccentric portion of the rotation shaft is overlapped with a orbiting wrap of the orbiting scroll in a radial direction, a back pressure chamber formed at a rear surface of the orbiting scroll may be eccentrically formed from the circular center around a discharge port to correspond to the eccentric discharge port, thereby effectively preventing tilting of the orbiting scroll due to the eccentricity of a gas force generated while the discharge port is eccentrically formed.

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; and   a driving unit configured to drive the rotation shaft,   wherein a back pressure chamber is formed between the orbiting scroll and the frame to support the orbiting scroll in the direction of the fixed scroll, and   when a line connecting the center (Po) of the compression chamber immediately prior to discharging compressed refrigerant from the first compression chamber and the second compression chamber to the geometric center (Oo) of the orbiting scroll is referred to as a first reference line (L 1 ), the back pressure chamber is formed such that the geometric center (So) of the back pressure chamber is located in a range of ±90° with respect to the first reference line (L 1 ).   
     
     
         2 . The scroll compressor of  claim 1 , wherein when a line perpendicular to the first reference line (L 1 ) passing through the geometric center (Oo) of the orbiting scroll is referred to as a second reference line (L 2 ), the geometric center (So) of the back pressure chamber is formed at the side at which the center (Po) of the final compression chamber is located with respect to the second reference line (L 2 ). 
     
     
         3 . The scroll compressor of  claim 1 , wherein the back pressure chamber is formed between a plurality of sealing members disposed to have a predetermined distance in a radial direction, and
 a cross-sectional area of the back pressure chamber between the plurality of sealing members is formed to be identical along a radial direction.   
     
     
         4 . The scroll compressor of  claim 1 , wherein the back pressure chamber is formed between a plurality of sealing members disposed to have a predetermined distance in a radial direction, and
 at least one side of the sealing member among the plurality of sealing members is formed in a non-circular shape.   
     
     
         5 . 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.   
     
     
         6 . The scroll compressor of  claim 5 , wherein when a distance between perpendiculars at the two contact points (P 1 , P 2 ) is I, I>0. 
     
     
         7 . 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.   
     
     
         8 . 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; and   a driving unit configured to drive the rotation shaft,   wherein a back pressure chamber is formed between the orbiting scroll and the frame to support the orbiting scroll in the direction of the fixed scroll, and   the back pressure chamber is formed between a plurality of sealing members disposed to have a predetermined distance in a radial direction.   
     
     
         9 . The scroll compressor of  claim 8 , wherein a cross-sectional area of the back pressure chamber between the plurality of sealing members is formed to be identical along a radial direction. 
     
     
         10 . The scroll compressor of  claim 8 , wherein the back pressure chamber is formed in a non-circular shape. 
     
     
         11 . The scroll compressor of  claim 10 , wherein a cross-sectional area of the back pressure chamber in a radial direction is formed to be different along the radial direction. 
     
     
         12 . The scroll compressor of  claim 8 , wherein at least one side of the sealing member among the plurality of sealing members is formed in a non-circular shape. 
     
     
         13 . The scroll compressor of  claim 8 , wherein when a line connecting the center (Po) of the compression chamber immediately prior to discharging compressed refrigerant from the first compression chamber and the second compression chamber to the geometric center (Oo) of the orbiting scroll is referred to as a first reference line (L 1 ), the back pressure chamber is formed such that the geometric center (So) of the back pressure chamber is located in a range of ±90° with respect to the first reference line (L 1 ). 
     
     
         14 . The scroll compressor of  claim 13 , wherein when a line perpendicular to the first reference line (L 1 ) passing through the geometric center (Oo) of the orbiting scroll is referred to as a second reference line (L 2 ), the geometric center (So) of the back pressure chamber is formed at the side at which the center (Po) of the final compression chamber is located with respect to the second reference line (L 2 ). 
     
     
         15 . The scroll compressor of  claim 8 , 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.   
     
     
         16 . The scroll compressor of  claim 15 , wherein when a distance between perpendiculars at the two contact points (P 1 , P 2 ) is I, I>0. 
     
     
         17 . The scroll compressor of  claim 8 , 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.