Compressor and compressor system

Abstract

A compressor according to an embodiment includes: a discharge valve; a discharge space formed downstream of the discharge valve; a liquid injection hole for injecting a refrigerant liquid into the discharge space; and a heat medium flow path located opposite to the discharge space across a partition wall forming the discharge space.

1 . A compressor, comprising:
 a discharge valve;   a discharge space formed downstream of the discharge valve;   a liquid injection hole for injecting a refrigerant liquid into the discharge space; and   a heat medium flow path located opposite to the discharge space across a partition wall forming the discharge space.   
     
     
         2 . The compressor according to  claim 1 , comprising:
 a lubricant oil flow path through which lubricant oil supplied to a part to be lubricated of the compressor flows,   wherein the heat medium flow path is disposed in series or parallel with the lubricant oil flow path.   
     
     
         3 . The compressor according to  claim 2 ,
 wherein the heat medium flow path is arranged in series with the lubricant oil flow path such that a circulation path for the lubricant oil including the part to be lubricated, the lubricant oil flow path, and the heat medium flow path is formed, and   wherein the compressor comprises an oil pump for circulating the lubricant oil in the circulation path.   
     
     
         4 . The compressor according to  claim 1 , comprising:
 a compressor driving motor; and   a coolant flow path for cooling the compressor driving motor,   wherein the coolant flow path communicates with the heat medium flow path.   
     
     
         5 . The compressor according to  claim 1 , comprising:
 a compressor casing;   a cylinder disposed in the compressor casing;   a piston for reciprocating inside the cylinder;   a valve plate disposed at one end of the cylinder and configured to support the discharge valve; and   a head cover which includes the partition wall forming the discharge space.   
     
     
         6 . The compressor according to  claim 5 , comprising:
 a jacket cover disposed on an outer surface of the head cover and internally having a heat medium introduction space,   wherein the heat medium introduction space forms the heat medium flow path.   
     
     
         7 . The compressor according to  claim 5 ,
 wherein the liquid injection hole includes:
 a through hole formed in the valve plate; and 
 a communication hole disposed in a wall portion of the compressor casing and communicating with the through hole to cause the through hole to communicate with an external space. 
   
     
     
         8 . The compressor according to  claim 5 ,
 wherein an outer peripheral edge portion of the valve plate is interposed between the compressor casing and an outer peripheral edge portion of the head cover.   
     
     
         9 . A compressor system, comprising:
 a low-stage compression part; and   a high-stage compression part,   wherein at least the low-stage compression part is constituted by the compressor according to  claim 5 .