Scroll compressor

Abstract

A scroll compressor ( 10 ) includes a bearing oil supply passage ( 70 ) configured to supply a refrigeration oil from an oil reservoir ( 18 ) located in a casing ( 15 ) to a bearing of a driving shaft ( 60 ). An oil groove ( 80 ) which communicates only with the oil reservoir ( 18 ) in the casing ( 15 ) through a connection passage ( 86 ) and a capillary tube ( 87 ) is formed on a thrust sliding surface ( 35 ) of a fixed scroll ( 30 ). Since the bearing oil supply passage ( 70 ) is not in communication with the oil groove ( 80 ), even when an orbiting scroll ( 40 ) is tilted and a pressure of the oil groove ( 80 ) decreases, a pressure of the bearing oil supply passage ( 70 ) does not decrease, and accordingly, the refrigeration oil is supplied from the bearing oil supply passage ( 70 ) to the bearing of the driving shaft ( 60 ).

1 . A scroll compressor comprising:
 a casing;   a compression mechanism housed in the casing, the compression mechanism including a fixed scroll and an orbiting scroll;   a driving shaft housed in the casing, the drive shaft being engaged with the orbiting scroll;   a bearing oil supply passage configured to supply the lubricating oil from an oil reservoir located in the casing to a bearing location in the compression mechanism, the bearing location being disposed with the driving shaft; and   a groove communication passage,   the compression mechanism being configured to discharge a compressed fluid into the casing and to generate a pressing force pressing the orbiting scroll against the fixed scroll,   the orbiting scroll having an end plate with a thrust sliding surface and the fixed scroll having a thrust sliding surface, the thrust sliding surfaces of the fixed scroll and the orbiting scroll being in sliding contact with each other,   one of the thrust sliding surfaces of the orbiting scroll and the fixed scroll includes an oil groove arranged such that a lubricating oil flows into the oil groove,   the bearing oil supply passage not being in communication with he oil groove, and   the groove communication passage connecting the oil groove to the oil reservoir in the casing.   
     
     
         2 . The scroll compressor of  claim 1 , wherein
 the bearing oil supply passage is provided with an oil supply pump driven by the driving shaft and configured to suck the lubricating oil from the oil reservoir in the casing and to discharge the lubricating oil, and   the groove communication passage is configured such that the lubricating oil is caused to flow through the groove communication passage only by a pressure difference between the oil reservoir and the oil groove.   
     
     
         3 . The scroll compressor of  claim 2 , wherein
 the groove communication passage is provided with at least one throttle configured to control a flow rate of the lubricating oil.   
     
     
         4 . The scroll compressor of  claim 3 , wherein
 the throttle is at least one rod member disposed in the groove communication passage, the throttle includes a spiral groove on an outer circumference, and the spiral groove is configured to allow the lubricating oil to flow therethrough.   
     
     
         5 . The scroll compressor of  claim 4 , wherein
 the at least one rod member includes a plurality of rod members, and   the plurality of rod members are disposed in a plurality of locations of the groove communication passage.   
     
     
         6 . The scroll compressor of  claim 5 , further comprising:
 a bearing separate from the compression mechanism and supporting the driving shaft in a rotatable manner,   the bearing including a first communicating path therein and the fixed scroll including a second communicating path therein, the first and second communicating paths forming parts of the groove communication passage, and   each of the first and second communicating paths being provided with an associated one of the rod members.   
     
     
         7 . The scroll compressor of  claim 1 , further comprising:
 a motor configured to drive and rotate the driving shaft; and   a connection pipe provided between the casing and the motor, the connection pipe forming part of the groove communication passage,   the connection pipe being one of
 a resin pipe made of a resin material, and 
 a metal pipe having an outer circumferential surface coated with a resin material. 
   
     
     
         8 . The scroll compressor of  claim 1 , wherein
 a lubricating oil inlet of the groove communication passage is located higher than a suction inlet of the bearing oil supply passage.   
     
     
         9 . The scroll compressor of  claim 2 , further comprising:
 a motor configured to drive and rotate the driving shaft; and   a connection pipe provided between the casing and the motor, the connection pipe forming part of the groove communication passage,   the connection pipe being one of
 a resin pipe made of a resin material, and 
 a metal pipe having an outer circumferential surface coated with a resin material. 
   
     
     
         10 . The scroll compressor of  claim 2 , wherein
 a lubricating oil inlet of the groove communication passage is located higher than a suction inlet of the bearing oil supply passage.   
     
     
         11 . The scroll compressor of  claim 3 , further comprising:
 a motor configured to drive and rotate the driving shaft; and   a connection pipe provided between the casing and the motor, the connection pipe forming part of the groove communication passage,   the connection pipe being one of
 a resin pipe made of a resin material, and 
 a metal pipe having an outer circumferential surface coated with a resin material. 
   
     
     
         12 . The scroll compressor of  claim 4 , further comprising:
 a motor configured to drive and rotate the driving shaft; and   a connection pipe provided between the casing and the motor, the connection pipe forming part of the groove communication passage,   the connection pipe being one of
 a resin pipe made of a resin material, and 
 a metal pipe having an outer circumferential surface coated with a resin material. 
   
     
     
         13 . The scroll compressor of  claim 4 , wherein
 a lubricating oil inlet of the groove communication passage is located higher than a suction inlet of the bearing oil supply passage.   
     
     
         14 . The scroll compressor of  claim 5 , further comprising:
 a motor configured to drive and rotate the driving shaft; and   a connection pipe provided between the casing and the motor, the connection pipe forming part of the groove communication passage,   the connection pipe being one of
 a resin pipe made of a resin material, and 
 a metal pipe having an outer circumferential surface coated with a resin material. 
   
     
     
         15 . The scroll compressor of  claim 5 , wherein a lubricating oil inlet of the groove communication passage is located higher than a suction inlet of the bearing oil supply passage. 
     
     
         16 . The scroll compressor of  claim 6 , further comprising:
 a motor configured to drive and rotate the driving shaft; and   a connection pipe provided between the casing and the motor, the connection pipe forming part, of the groove communication passage,   the connection pipe being one of
 a resin pipe made of a resin material, and 
 a metal pipe having an outer circumferential surface coated with a resin material. 
   
     
     
         17 . The scroll compressor of  claim 6 , wherein
 a lubricating oil inlet of the groove communication passage is located higher than a suction inlet of the bearing oil supply passage.   
     
     
         18 . The scroll compressor of  claim 12 , wherein
 a lubricating oil inlet of the groove communication passage is located higher than a suction inlet of the bearing oil supply passage.   
     
     
         19 . The scroll compressor of  claim 14 , wherein
 a lubricating oil inlet of the groove communication passage is located higher than a suction inlet of the bearing oil supply passage.   
     
     
         20 . The scroll compressor of  claim 16 , wherein
 a lubricating oil inlet of the groove communication passage is located higher than a suction inlet of the bearing oil supply passage.