Hermetic type compressor

Abstract

A hermetic type compressor that includes a cylinder having a compression chamber with a cylinder head coupled to the cylinder to seal the compression chamber. A fastener fastened to the cylinder couples the cylinder head to the cylinder. A fastening hole is formed in the cylinder into which the fastener is received. A bush may be disposed between the fastener and fastener hole. The fastener may be made of a material having a thermal expansion coefficient less than that of the cylinder. Additionally, the bush may be made of a material having a thermal expansion coefficient greater than that of the cylinder.

1 . A hermetic compressor, comprising: 
 a cylinder having a compression chamber;    a cylinder head coupled to the cylinder to seal the compression chamber;    at least one fastener coupling the cylinder head to the cylinder, the at least one fastener being made at least in part of a material having a thermal expansion coefficient less than that of the cylinder;    at least one fastening hole, formed in the cylinder, configured to receive the at least one fastener; and    at least one bush configured to be disposed between the at least one fastener and the at least one fastening hole and made at least in part of a material having a thermal expansion coefficient greater than that of the cylinder.    
   
   
       2 . The hermetic compressor according to  claim 1 , wherein an inner circumference of the at least one bush is threaded onto the at least one fastener.  
   
   
       3 . The hermetic compressor according to  claim 2 , wherein an outer circumference of the at least one bush is threaded into an inner circumference of the at least one fastening hole.  
   
   
       4 . The hermetic compressor according to  claim 2 , wherein an outer circumference of the at least one bush is received in an inner circumference of the at least one fastening hole.  
   
   
       5 . The hermetic compressor according to  claim 1 , wherein an outer circumference of the at least one bush is received in an inner circumference of the at least one fastening hole.  
   
   
       6 . The hermetic compressor according to  claim 5 , wherein the outer circumference of the at least one bush has a polygonal shape, and an inner circumference of the at least one fastening hole into which the at least one bush is threaded has a shape corresponding to the polygonal shape of the outer circumference of the at least one bush.  
   
   
       7 . The hermetic compressor as claimed in  claim 1 , wherein an outer circumference of the at least one bush is threaded into an inner circumference of the at least one fastening hole.  
   
   
       8 . The hermetic compressor as claimed in  claim 7 , wherein: 
 the at least one bush is positioned in a side of the at least one fastening hole at an insertion point of the at least one fastener, and    the at least one bush further includes at least one groove formed in at least one side thereof corresponding to the side of the at least one fastening hole.    
   
   
       9 . The hermetic compressor as claimed in  claim 1 , wherein: 
 the at least one bush is installed in a side of the at least one fastening hole at an insertion point of the at least one fastener, and at least a portion of the at least one fastening hole includes at least first and second diameters, the first diameter being located where the at least one bush is installed and the second diameter being located inside the first diameter to form at least one step therebetween, and    the first diameter is larger than the second diameter.    
   
   
       10 . The hermetic compressor as claimed in  claim 1 , wherein: 
 the cylinder is made at least in part of cast iron,    the at least one fastener is made at least in part of Cr—Mo steel, and    the at least one bush is made at least in part of copper.    
   
   
       11 . A hermetic compressor, comprising: 
 a cylinder having a compression chamber;    a cylinder head configured to be coupled to the cylinder to seal the compression chamber; and    a plurality of fixing bolts configured to be fastened into a plurality of bolt fastening holes formed in the cylinder head to couple the cylinder head to the cylinder,    wherein the plurality of fixing bolts are made at least in part of a material having a thermal expansion coefficient greater than a thermal expansion coefficient of the cylinder.    
   
   
       12 . A hermetic compressor, comprising: 
 a cylinder including a compression chamber;    a cylinder head configured to be coupled to the cylinder;    at least one fixing bolt configured to be attached to the cylinder to couple the cylinder head to the cylinder;    at least one bolt fastening hole configured to receive the at least one fixing bolt; and    at least one bush configured to be disposed between the at least one fixing bolt and the at least one bolt fastening hole.    
   
   
       13 . The hermetic compressor according to  claim 12 , wherein the at least one bush is comprised at least in part of a material having a thermal expansion coefficient greater than a thermal expansion coefficient of the cylinder.  
   
   
       14 . The hermetic compressor according to  claim 12 , wherein an inner circumference of the at least one bush is configured to be attached to an outer circumference of the at least one fixing bolt.  
   
   
       15 . The hermetic compressor according to  claim 14 , wherein an outer circumference of the at least one bush is configured to be attached to an inner circumference of the at least one bolt fastening hole.  
   
   
       16 . The hermetic compressor according to  claim 12 , wherein an outer circumference of the at least one bush is configured to be attached to an inner circumference of the at least one bolt fastening hole.  
   
   
       17 . The hermetic compressor according to  claim 12 , wherein a surface of the at least one bush has a polygonal shape.  
   
   
       18 . The hermetic compressor according to  claim 17 , wherein an inner surface of the at least one bolt fastening hole corresponds to the polygonal shape of the at least one bush.  
   
   
       19 . The hermetic compressor according to  claim 12 , wherein the at least one bolt fastening hole includes at least a first diameter and a second diameter, the first diameter being larger than the second diameter and positioned to receive the at least one bush.  
   
   
       20 . The hermetic compressor according to  claim 19 , wherein the second diameter is positioned inside the first diameter to form a step.