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, when a bearing area between the orbiting scroll and the rotation shaft is A and an end plate area of the orbiting scroll is B, A/B may be formed in a range of 0.035-0.085, and thus it may be possible to obtain a sufficient volume ratio and Sommerfeld number as well as reducing the overall size of the compressor, thereby reducing a frictional loss and abrasion in the compressor.

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 movement against the fixed 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 when a bearing area between the orbiting scroll and the rotation shaft is A and an end plate area of the orbiting scroll is B, A/B is formed in a range of 0.035-0.085.   
     
     
         2 . 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.   
     
     
         3 . The scroll compressor of  claim 2 , wherein when a distance between perpendiculars at the two contact points (P 1 , P 2 ) is I, I>0. 
     
     
         4 . 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 rotation shaft combining portion.   
     
     
         5 . The scroll compressor of  claim 1 , wherein the rotation shaft comprises:
 a shaft portion connected to the driving unit;   a pin portion concentrically formed with the shaft portion at an end portion of the shaft portion; and   an eccentric bearing eccentrically combined with the pin portion to form the eccentric portion,   wherein the eccentric bearing is rotatably combined with the rotation shaft combining portion.   
     
     
         6 . The scroll compressor of  claim 5 , wherein the pin portion is formed to have an asymmetric shape based on the center thereof. 
     
     
         7 . 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 compression chambers at an inner surface and an outer surface thereof, respectively, and perform a orbiting movement against the fixed 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 rotation shaft combining portion is formed at the orbiting scroll to be combined with the rotation shaft, and an eccentric bearing combined with the rotation shaft combining portion to form the eccentric portion is combined with the rotation shaft, and   a value of a bearing area between an inner circumferential surface of the rotation shaft combining portion and an outer circumferential surface of the eccentric bearing divided by an end plate area of the orbiting scroll is formed in a range of 0.035-0.085.   
     
     
         8 . The scroll compressor of  claim 7 , 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.   
     
     
         9 . The scroll compressor of  claim 8 , wherein when a distance between perpendiculars at the two contact points (P 1 , P 2 ) is I, I>0. 
     
     
         10 . The scroll compressor of  claim 7 , 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 rotation shaft combining portion.