Scroll compressor and refrigerating machine having the same

Abstract

A scroll compressor and a refrigerating machine including the scroll compressor are provided. An oil supply channel may be formed in a fixed scroll of the compressor so as to provide for communication between a back pressure chamber and compression chambers formed between the fixed scroll and an orbiting scroll. The oil supply channel enables oil to be smoothly introduced from the back pressure chamber into each compression chamber, so that frictional losses and refrigerant leakage in the compression chambers may be effectively prevented, and efficiency of the compressor and the refrigerating machine including the compressor may be enhanced.

1 . A scroll compressor, comprising:
 a casing that defines an interior space;   a frame provided in the interior space of the casing;   a fixed scroll fixed to the frame;   an orbiting scroll positioned between the frame and the fixed scroll, wherein the fixed scroll comprises a fixed wrap that extends toward the orbiting scroll and the orbiting scroll comprises an orbiting wrap that extends toward the fixed scroll such that the fixed wrap and the orbiting wrap are inter-engaged so as to form compression chambers therebetween;   a back pressure chamber defined by a portion of the orbiting scroll, a portion of the fixed scroll, and a recess formed in the frame; and   at least one fluid supply channel formed in the fixed scroll so as to connect the back pressure chamber and at least one of the compression chambers.   
   
   
       2 . The scroll compressor of  claim 1 , wherein the back pressure chamber is defined by an outer peripheral edge of the orbiting scroll, a portion of a lower surface of the orbiting scroll adjacent to the outer peripheral edge thereof, a portion of a lower surface of the fixed scroll, and the recess which is formed in an upper surface of the frame. 
   
   
       3 . The scroll compressor of  claim 1 , wherein the at least one fluid supply channel comprises:
 a first communicating groove formed in an upper surface of the fixed scroll;   a first channel hole that extends at an incline from a lower portion of the fixed scroll corresponding to the back pressure chamber to the communicating groove; and   a second channel hole that extends from the communicating groove to the at least one compression chamber of the compression chambers.   
   
   
       4 . The scroll compressor of  claim 3 , further comprising a shielding member that isolates the communicating groove from the interior space formed in the casing. 
   
   
       5 . The scroll compressor of  claim 4 , wherein the first communicating groove comprises a substantially circular recess formed in the upper surface of the fixed scroll, and the shielding member comprises a bolt coupled to the fixed scroll and a washer positioned between the bolt and the fixed scroll. 
   
   
       6 . The scroll compressor of  claim 4 , wherein the shielding member is press fit into the first communicating groove so as to provide a seal between the first communicating groove and the interior space formed in the casing. 
   
   
       7 . The scroll compressor of  claim 3 , wherein the second channel hole is positioned radially inward from the first channel hole in the fixed scroll, and wherein the first channel hole extends at an incline from a lower outer peripheral portion of the fixed scroll toward the first communicating groove and the second channel hole. 
   
   
       8 . The scroll compressor of  claim 7 , wherein the second channel hole extends downward from the first communicating groove so as to alternately communicate with the at least one compression chamber. 
   
   
       9 . The scroll compressor of  claim 3 , further comprising a second communicating groove formed in a lower surface of the fixed scroll and extending into a bearing surface between the fixed scroll and the orbiting scroll, wherein the second communicating groove directs fluid from the back pressure chamber into the first channel hole. 
   
   
       10 . The scroll compressor of  claim 9 , wherein the second communicating groove extends radially along the lower surface of the fixed scroll, and wherein a cross section of the second communicating groove is greater than a cross section of the first channel hole. 
   
   
       11 . The scroll compressor of  claim 1 , wherein a thickness of the at least one fluid supply channel is less than or equal to a thickness of the orbiting wrap. 
   
   
       12 . The scroll compressor of  claim 1 , wherein the fluid supply channel conveys fluid comprising oil, refrigerant or a combination thereof between the back pressure chamber and the at least one compression chamber. 
   
   
       13 . The scroll compressor of  claim 1 , wherein a first pressure at a contact area between the fixed scroll and the orbiting scroll is greater than a second pressure at a contact area between the orbiting scroll and the frame, and a third pressure in the back pressure chamber is between the first pressure and the second pressure. 
   
   
       14 . The scroll compressor of  claim 1 , wherein the fixed wrap and the orbiting wrap are symmetrical, with compression chambers formed therebetween such that fluid is supplied alternately to a first compression chamber and a second compression chamber through the fluid supply channel. 
   
   
       15 . A refrigerating apparatus, comprising:
 a compressor;   a condenser coupled to a discharge side of the compressor;   an expander coupled to the condenser; and   an evaporator coupled to the expander and to a suction side of the compressor, wherein the compressor comprises:
 a casing that defines an interior space; 
 a frame provided in the interior space; 
 a fixed scroll fixed to the frame; 
 an orbiting scroll provided between the frame and the fixed scroll and engaged with the fixed scroll so as to form compression spaces therebetween; 
 a back pressure chamber defined by a portion of the orbiting scroll, a portion of the fixed scroll, and a recess formed in the frame so as to support a relative axial position of the fixed scroll and the orbiting scroll; and 
 a fluid supply channel that extends through the fixed scroll so as to connect the back pressure chamber with at least one of the compression chambers.