Compressor

Abstract

A compressor has a valve port plate made of a steel, through which heat of compressed gas having a relatively higher temperature is transmitted to suction gas having a relatively lower temperature. The valve port plate is carburized to have a carburized layer for reducing heat transmission from the compressed gas to the suction gas.

1 . A compressor comprising: 
 a valve port plate made of a steel, wherein the valve port plate is carburized to have a carburized layer.    
   
   
       2 . The compressor according to  claim 1 , wherein a total thickness of the carburized layer is about 10 percent or more of the thickness of the valve port plate.  
   
   
       3 . The compressor according to  claim 2 , wherein a total thickness of the carburized layer is about 50 percent or more of the thickness of the valve port plate.  
   
   
       4 . The compressor according to  claim 3 , wherein a total thickness of the carburized layer is about 60 percent or more of the thickness of the valve port plate.  
   
   
       5 . The compressor according to  claim 1 , wherein the valve port plate is so carburized that no iron carbide layer is precipitated in the carburized layer.  
   
   
       6 . The compressor according to  claim 1 , wherein the carburizing of the valve port plate is selected from a group comprising vacuum carburizing, solid carburizing, liquid carburizing, and gas carburizing.  
   
   
       7 . The compressor according to  claim 1 , wherein the valve port plate is made of cold-rolled steel plate.  
   
   
       8 . The compressor according to  claim 1 , wherein the valve port plate is made of hot-rolled mild steel plate.  
   
   
       9 . The compressor according to  claim 1 , wherein the valve port plate is made of electromagnetic soft iron plate.  
   
   
       10 . The compressor according to  claim 1 , wherein the compressor is of a piston type, further comprising: 
 a cylinder block having formed therethrough a cylinder bore; and    a piston received in the cylinder bore for reciprocation therein, whereby gas is introduced, compressed and discharged.    
   
   
       11 . The compressor according to  claim 10 , wherein the gas is refrigerant gas.  
   
   
       12 . The compressor according to  claim 10 , further comprising: 
 a housing having formed therein a suction chamber and a discharge chamber, wherein the valve port plate is located between the housing and the cylinder block, and wherein the carburized layer is formed on at least one surface of the valve port plate.    
   
   
       13 . The compressor according to  claim 12 , wherein the carburized layer is formed on the surface of the valve port plate adjacent to the housing.  
   
   
       14 . The compressor according to  claim 12 , wherein the carburized layer is formed on the surface of the valve port plate adjacent to the cylinder block.  
   
   
       15 . The compressor according to  claim 12 , wherein the carburized layer is formed on opposite surfaces of the valve port plate.  
   
   
       16 . The compressor according to  claim 1 , wherein the carburized layer is formed across the entire thickness of the valve port plate.  
   
   
       17 . The compressor according to  claim 1 , wherein carbon dioxide is used as refrigerant for the compressor.  
   
   
       18 . The compressor according to  claim 1 , wherein a total thickness of the carburized layer is about 1 mm or more.  
   
   
       19 . The compressor according to  claim 18 , wherein a total thickness of the carburized layer is about 1.2 mm or more.