Gas compressor

Abstract

To provide a gas compressor in which a gas leakage from compression chambers is suppressed to thereby make it possible to enhance compressor characteristics such as a volumetric efficiency. A seal member is interposed between a cylinder of a gas compressor and two side blocks for sealing both end faces of the cylinder, and the seal member is arranged at a position for separating inside and outside of the cylinder so as to surround an opening of a hollow portion of the cylinder. The end face of the cylinder is brought into intimate contact with the end surface of a rear side block or a front side block. Then, the confronting surfaces of the two members are brought into intimate contact with each other to form a close contact portion.

What is claimed is:  
     
         1 . A gas compressor comprising; 
 a cylinder having a hollow portion opened at both ends and in which at least one compression chamber is formed in the hollow portion;    two side blocks in intimate contact with both end faces of the cylinder for sealing both ends of the cylinder, respectively;    a rear cover for storing the side block and the cylinder; and    a first seal means interposed in a close contact portion in which at least one of the two side blocks and the cylinder are brought into contact with each other,    wherein the first seal means is arranged so as to surround an opening of the hollow portion.    
     
     
         2 . A gas compressor comprising: 
 a cylinder having a hollow portion opened at both ends and in which at least one compression chamber is formed in the hollow portion;    an intake portion having an opening formed at the end face of the cylinder for introducing refrigerant gas to the compression chamber;    two side blocks in intimate contact with both end faces of the cylinder for sealing both ends of the cylinder, respectively; and    a first seal means interposed in a close contact portion in which at least one of the two side blocks and the cylinder are brought into intimate contact with each other,    wherein the first seal means surround the opening of the hollow portion and is arranged at a position for separating the opening portion of the intake portion and the opening of the hollow portion.    
     
     
         3 . A gas compressor according to  claim 2 , wherein a second seal means for sealing and surrounding the opening of the intake portion.  
     
     
         4 . A gas compressor according to  claim 1 , wherein a cylinder cutaway portion for receiving the refrigerant gas discharged from the compression chamber is formed in an outer circumference of the cylinder and a fitting projecting portion for fitting the cylinder cutaway portion is formed in at least one of the two side blocks.  
     
     
         5 . A gas compressor according to  claim 1 , the gas compressor comprising in an inner contact projecting portion for intimately contacting the inner circumferential surface of the cylinder with at least one of the two side blocks, 
 wherein the first seal means is interposed in the close contact portion formed between the inner contact projecting portion and the inner circumferential surface of the cylinder.    
     
     
         6 . A gas compressor according to  claim 1 , wherein the first seal means or the second seal means is made of a elastic seal member and the elastic seal member is fitted in a groove formed on one side of the two members facing each other at the close contact portion.  
     
     
         7 . A gas compressor according to  claim 1 , wherein the first seal means or the second seal means is formed of a thin plate-like gasket.  
     
     
         8 . A gas compressor comprising: 
 a cylinder having a hollow portion opened at both ends and in which at least one compression chamber is formed in the hollow portion; and    two side blocks in intimate contact with both end faces of the cylinder for sealing both ends of the cylinder, respectively, wherein    a cylinder cutaway portion for receiving the refrigerant gas discharged from the compression chamber is formed in a circumferential wall outer side portion of the cylinder,    a fitting projecting portion for fitting the cylinder cutaway portion is formed in at least one of the two side block,    a groove extending to the outer circumference of the fitting projecting portion or its proximal end is formed circumferentially in an outer circumferential edge of a close contact portion where the side block having the fitting projecting portion and the cylinder are brought into intimate contact with each other, and    an elastic seal member is fitted in the groove.