Compressor

Abstract

A piston-type compressor has gaskets located between a cylinder blocks and front and rear housings mated to the cylinder blocks. The front and rear housings are made of magnesium alloy, and cylinder blocks are made of aluminum. The gaskets are constituted of resilient material and contain white carbon or a mixture of white carbon and black carbon to provide a superior electrical non-conductivity. The gaskets electrically isolate the housings and cylinder blocks so as to prevent a galvanic corrosion at surfaces where the two different metals of the compressor components are jointed.

What is claimed is:  
     
         1 . A compressor comprising: 
 a first component member made of first metallic material;    a second component member made of second metallic material which has different inherent electrical potential from that of the first metallic material; and    a resilient insulating member disposed between the first component member and the second component member so as to electrically isolate the component members from one another, wherein the resilient insulating member is constituted a resilient material containing white carbon.    
     
     
         2 . The compressor according to  claim 1 , wherein the second metallic material has lower inherent electrical potential than that of the first metallic material.  
     
     
         3 . The compressor according to  claim 1 , wherein the first metallic material is aluminum or an aluminum alloy.  
     
     
         4 . The compressor according to  claim 1 , wherein the second metallic material is magnesium or a magnesium alloy.  
     
     
         5 . The compressor according to  claim 1 , wherein the compressor is a piston type compressor, and the first component member is a cylinder block, which accommodates a piston inside.  
     
     
         6 . The compressor according to  claim 1 , wherein the compressor is a piston type compressor, the second component member is a housing mated to a cylinder block.  
     
     
         7 . The compressor according to  claim 6 , wherein at least one of a suction chamber and a discharge chamber is provided in the housing.  
     
     
         8 . The compressor according to  claim 1 , wherein the white carbon is selected from the group constituting of silicic anhydride, silicic hydrate, synthetic silicate and a mixture thereof.  
     
     
         9 . The compressor according to  claim 1 , wherein white carbon is present in an amount of about 50% by weight of the resilient material.  
     
     
         10 . The compressor according to  claim 1 , wherein the resilient insulating member contains carbon black.  
     
     
         11 . The compressor according to  claim 10 , wherein carbon black is present in an amount of about 10% by weight or less of the resilient material.  
     
     
         12 . The compressor according to  claim 10 , wherein carbon black is present in an amount of about 5% by weight or less of the resilient material.