Scroll compressor

Abstract

A scroll compressor is provided. The scroll compressor may include guide holes formed at one of a wrap portion or a base portion, and guide pins inserted into the guide holes formed at the other of the wrap portion or the base portion to couple the wrap portion and the base portion to each other. Such guide pins and guide holes may be easily processed to reduce fabrication costs and reduce or eliminate unstable behavior of the orbiting scroll. As the guide pins and the guide holes have a circular cross section, abrasion of the guide pins or the guide holes may be prevented.

What is claimed is: 
     
         1 . A scroll compressor, comprising:
 a case;   a fixed scroll installed in the case;   an orbiting scroll installed in the case and engaged with the fixed scroll, the orbiting scroll comprising:
 a wrap portion configured engage the fixed scroll to form compression chambers therebetween; 
 a base portion coupled to the wrap portion and configured to be movable towards the fixed scroll to support the wrap portion; 
 a plurality of guide pins provided at one of the wrap portion or the base portion, the plurality of guide pins extending in an axial direction of the wrap portion and the base portion; and 
 a corresponding plurality of guide holes formed in the other of the wrap portion or the base portion, the plurality of guide holes extending in the axial direction of the wrap portion and the base portion, at positions respectively corresponding to the plurality of guide pins, such that the plurality of guide pins are slidably received in the plurality of guide holes; 
   a driving motor coupled to the base portion and configured to eccentrically rotate the base portion and the wrap portion; and   a main frame installed in the case and configured to support the base portion.   
     
     
         2 . The scroll compressor of  claim 1 , wherein each of the plurality of guide pins has a curved outer circumferential surface, and each of the plurality of guide holes has a cross-sectional shape corresponding to its respective guide pin. 
     
     
         3 . The scroll compressor of  claim 1 , further comprising a back pressure chamber formed between the wrap portion and the base portion, and in communication with the compression chambers. 
     
     
         4 . The scroll compressor of  claim 1 , further comprising a ring shaped seal provided between the wrap portion and the base portion, wherein the back pressure chamber is formed within in a space defined by the seal. 
     
     
         5 . The scroll compressor of  claim 1 , wherein the base portion comprises:
 a boss coupled to a rotation shaft of the driving motor; and   a base flange extending radially outward from the boss, facing the wrap portion, wherein the back pressure chamber is formed on a surface of the base flange facing the wrap portion.   
     
     
         6 . The scroll compressor of  claim 1 , wherein the wrap portion comprises:
 a wrap flange having a first surface facing the base portion; and   an orbiting wrap extending from a second surface of the wrap flange, opposite the first surface thereof, and engaged with a fixed wrap of the fixed scroll; and   a back pressure hole extending through the wrap flange to provide for communication between the back pressure chamber and the compression chambers.   
     
     
         7 . The scroll compressor of  claim 6 , wherein the back pressure hole is formed at a position on the wrap flange where a discharge pressure, and an intermediate pressure between a discharge pressure and a suction pressure, are applied to the back pressure chamber. 
     
     
         8 . The scroll compressor of  claim 7 , wherein the back pressure hole is formed at a point which is greater than a discharge starting angle and less than the discharge starting angle plus 180 degrees. 
     
     
         9 . The scroll compressor of  claim 1 , further comprising a plurality of keys integrally formed on one of the wrap portion or the base portion, and a corresponding plurality of key grooves formed in the other of the wrap portion or the base portion and respectively coupled with the plurality of keys. 
     
     
         10 . The scroll compressor of  claim 1 , wherein an interior of the case is divided into a first space and a second space, the first and second spaces having different pressures, and wherein the wrap portion and the base portion are installed in the first space, the pressure of the first space being lower than that of the second space. 
     
     
         11 . A scroll compressor, comprising:
 a fixed scroll having a fixed wrap; and   an orbiting scroll having an orbiting wrap that is engaged with the fixed wrap such that a pair of compression chambers are formed between the orbiting scroll and the fixed scroll, wherein the pair of compression chambers move as the orbiting scroll orbits with respect to the fixed scroll,   wherein the orbiting scroll includes at least a first part and a second part arranged in an axial direction, and wherein a plurality of guide pins are formed on one of the first part or the second part, extending in the axial direction, and a corresponding plurality of guide holes are formed in the other of the first part or the second part, extending in the axial direction, and wherein the plurality of guide pins are slidably received in the plurality of guide holes to couple the first part and the second part.   
     
     
         12 . The scroll compressor of  claim 11 , wherein each of the plurality of guide pins has a curved outer circumferential surface, and each of the plurality of guide holes has a cross-sectional shape corresponding to its respective guide pin. 
     
     
         13 . The scroll compressor of  claim 12 , further comprising a back pressure chamber formed between the first and second parts of the orbiting scroll for receiving refrigerant from the pair of compression chambers, wherein a geometric center of the back pressure chamber is eccentric from a geometric center of the orbiting scroll. 
     
     
         14 . The scroll compressor of  claim 11 , further comprising a ring shaped seal provided between the first and second parts of the orbiting scroll, wherein the back pressure chamber is formed within a periphery of the seal. 
     
     
         15 . The scroll compressor of  claim 12 , further comprising a back pressure hole formed in one of the first part or the second part, at a position corresponding to the pair of compression chambers, wherein the back pressure hole provides for communication between the back pressure chamber and the pair of compression chambers. 
     
     
         16 . The scroll compressor of  claim 13 , wherein the back pressure hole is formed at a position where a discharge pressure, and an intermediate pressure between a discharge pressure and a suction pressure, are applied to the back pressure chamber. 
     
     
         17 . The scroll compressor of  claim 14 , wherein the back pressure hole is formed at a point on the orbiting wrap that is greater than a discharge starting angle and less than the discharge starting angle plus 180 degrees.