Scroll compressor and refrigerating apparatus

Abstract

A scroll compressor includes a casing, and a compression mechanism housed in the casing. The compression mechanism includes a fixed scroll and an orbiting scroll. The fixed scroll includes a fixed end plate, an outer circumferential wall provided on an outer edge of the fixed end plate, and a spiral fixed wrap provided inside the outer circumferential wall. The orbiting scroll includes an orbiting end plate, and a spiral orbiting wrap provided on a front surface of the orbiting end plate. The outer circumferential wall has a facing surface that faces the front surface of the orbiting end plate. The facing surface has an oil groove to which a lubricant with a high pressure equivalent to a discharge pressure of the compression mechanism is supplied. The oil groove has a circumferential groove portion, and a radial groove portion extending radially outward and communicating with the circumferential groove portion.

1 . A scroll compressor comprising:
 a casing; and   a compression mechanism housed in the casing, the compression mechanism including a fixed scroll and an orbiting scroll,   the fixed scroll including
 a fixed end plate, 
 an outer circumferential wall provided on an outer edge of the fixed end plate, and 
 a fixed wrap that is spiral and provided inside the outer circumferential wall, 
   the orbiting scroll including
 an orbiting end plate with which distal ends of the fixed wrap and the outer circumferential wall are in sliding contact, and 
 an orbiting wrap that is spiral, provided on a front surface of the orbiting end plate, and meshing with the fixed wrap, 
   the outer circumferential wall having a facing surface that faces the front surface of the orbiting end plate, the facing surface having an oil groove to which a lubricant with a high pressure equivalent to a discharge pressure of the compression mechanism is supplied, and   the oil groove having
 a circumferential groove portion extending in a circumferential direction of the fixed scroll, and 
 a radial groove portion extending outward in a radial direction of the fixed scroll and communicating with the circumferential groove portion. 
   
     
     
         2 . The scroll compressor of  claim 1 , further comprising:
 a housing disposed on a back surface of the orbiting scroll, the housing forming a back pressure space between the housing and the orbiting scroll, and the housing having an annular ring groove in a surface facing the orbiting scroll; and   a sealing ring housed in the ring groove, the sealing ring being in contact with the back surface of the orbiting scroll to partition the back pressure space into
 a first back pressure space on an inner circumference side of the ring groove and 
 a second back pressure space on an outer circumference of the ring groove, 
   the first back pressure space having a pressure equivalent to the discharge pressure of the compression mechanism,   the second back pressure space having a pressure
 equal to or higher than a pressure of a fluid sucked into the compression mechanism and 
 lower than a pressure of a fluid discharged from the compression mechanism, and 
   the radial groove portion communicating with the second back pressure space when the orbiting scroll tilts.   
     
     
         3 . The scroll compressor of  claim 1 , wherein
 the radial groove portion is located at an end of the circumferential groove portion.   
     
     
         4 . The scroll compressor of  claim 2 , wherein
 the radial groove portion is located at an end of the circumferential groove portion.   
     
     
         5 . The scroll compressor of  claim 1 , wherein
 a seal length of a portion of the facing surface from an end of the radial groove portion to an outer edge of the orbiting scroll is equal to or greater than 2 mm.   
     
     
         6 . A refrigeration apparatus including the scroll compressor of  claim 1 , the refrigeration apparatus further comprising:
 a refrigerant circuit through which a refrigerant compressed by the scroll compressor flows.