Scroll compressor

Abstract

A scroll compressor prevents shortage of lubrication for sliding portions of a scroll unit. A scroll compressor 10 includes: an oil separator 100 that separates lubricant from the gaseous refrigerant discharged into a discharge chamber H3; a first lubricant chamber H5 that stores the lubricant separated by the oil separator 100; a first lubricant supply passage for supplying the lubricant in the first lubricant chamber H5 to a back pressure chamber H6; and a second lubricant supply passage for supplying the lubricant in the first lubricant chamber to a portion near an outer end portion of a scroll unit 50. The second lubricant supply passage is formed as a passage that allows the lubricant in the first lubricant chamber to flow through a second lubricant chamber H7 disposed above the first lubricant chamber H5 and connected to the first lubricant chamber H5 via an orifice OL3.

1 . A scroll compressor having a housing in which a scroll unit including a fixed scroll and an orbiting scroll that face each other is disposed, the housing including a discharge chamber into which gaseous refrigerant compressed by the scroll unit is discharged, the scroll compressor comprising:
 an oil separator that separates lubricant from the gaseous refrigerant discharged into the discharge chamber;   a first lubricant chamber that stores the lubricant separated by the oil separator;   a back pressure chamber that is formed on a back surface side of the orbiting scroll;   a first lubricant supply passage for supplying the lubricant in the first lubricant chamber to the back pressure chamber; and   a second lubricant supply passage for supplying the lubricant in the first lubricant chamber to a portion near an outer end portion of the scroll unit,   wherein the second lubricant supply passage is formed as a passage that allows the lubricant in the first lubricant chamber to flow through the second lubricant chamber disposed above the first lubricant chamber and connected to the first lubricant chamber via an orifice.   
     
     
         2 . The scroll compressor according to  claim 1 , wherein the second lubricant supply passage is formed as a passage for allowing the lubricant that has passed through the second lubricant chamber or lubricant that is stored in the second lubricant chamber to flow through a lubricant return hole formed in the fixed scroll. 
     
     
         3 . The scroll compressor according to  claim 2 , wherein the lubricant return hole is formed above a discharge hole through which the gaseous refrigerant compressed by the scroll unit is discharged to the discharge chamber. 
     
     
         4 . The scroll compressor according to  claim 2 ,
 wherein the fixed scroll includes a fixed plate and a fixed spiral wall that is erected on one surface of the fixed plate,   wherein the orbiting scroll includes an orbiting plate and an orbiting spiral wall that is erected on one surface of the orbiting plate,   wherein the fixed scroll and the orbiting scroll are disposed such that the fixed spiral wall and the orbiting spiral wall engage with each other, and   wherein one end of the lubricant return hole is open to another surface of the fixed plate and communicates with the second lubricant chamber, and another end of the lubricant return hole is open to a portion corresponding to a spiral end portion of the orbiting spiral wall on the one surface of the fixed plate.   
     
     
         5 . The scroll compressor according to  claim 1 , wherein the second lubricant chamber is formed radially outside the discharge chamber such that the second lubricant chamber surrounds the discharge chamber. 
     
     
         6 . The scroll compressor according to  claim 5 , wherein the first lubricant chamber and the second lubricant chamber are connected in series in in a circumferential direction via the orifice. 
     
     
         7 . The scroll compressor according to  claim 1 , wherein the first lubricant chamber, the second lubricant chamber, and the orifice are formed by the fixed scroll and a housing member constituting the housing. 
     
     
         8 . The scroll compressor according to  claim 3 ,
 wherein the fixed scroll includes a fixed plate and a fixed spiral wall that is erected on one surface of the fixed plate,   wherein the orbiting scroll includes an orbiting plate and an orbiting spiral wall that is erected on one surface of the orbiting plate,   wherein the fixed scroll and the orbiting scroll are disposed such that the fixed spiral wall and the orbiting spiral wall engage with each other, and   wherein one end of the lubricant return hole is open to another surface of the fixed plate and communicates with the second lubricant chamber, and another end of the lubricant return hole is open to a portion corresponding to a spiral end portion of the orbiting spiral wall on the one surface of the fixed plate.   
     
     
         9 . The scroll compressor according to  claim 2 , wherein the second lubricant chamber is formed radially outside the discharge chamber such that the second lubricant chamber surrounds the discharge chamber. 
     
     
         10 . The scroll compressor according to  claim 3 , wherein the second lubricant chamber is formed radially outside the discharge chamber such that the second lubricant chamber surrounds the discharge chamber. 
     
     
         11 . The scroll compressor according to  claim 4 , wherein the second lubricant chamber is formed radially outside the discharge chamber such that the second lubricant chamber surrounds the discharge chamber. 
     
     
         12 . The scroll compressor according to  claim 2 , wherein the first lubricant chamber, the second lubricant chamber, and the orifice are formed by the fixed scroll and a housing member constituting the housing. 
     
     
         13 . The scroll compressor according to  claim 3 , wherein the first lubricant chamber, the second lubricant chamber, and the orifice are formed by the fixed scroll and a housing member constituting the housing. 
     
     
         14 . The scroll compressor according to  claim 4 , wherein the first lubricant chamber, the second lubricant chamber, and the orifice are formed by the fixed scroll and a housing member constituting the housing. 
     
     
         15 . The scroll compressor according to  claim 5 , wherein the first lubricant chamber, the second lubricant chamber, and the orifice are formed by the fixed scroll and a housing member constituting the housing. 
     
     
         16 . The scroll compressor according to  claim 6 , wherein the first lubricant chamber, the second lubricant chamber, and the orifice are formed by the fixed scroll and a housing member constituting the housing.