Compressor

Abstract

A compressor capable of damping the suction pulsation or discharge pulsation thereof with a simple structure, wherein either of a suction chamber and a discharge chamber formed at the center of a rear head is allowed to communicate with a corresponding port through a tunnel-shaped communication path and a muffler space is formed between the tunnel-shaped communication path and a pipe connection part for connecting the port thereto, whereby, when the communication path allows the suction chamber to communicate with the pipe connection part of the suction port, the suction pulsation can be suppressed or prevented and, when the communication path allows the discharge chamber to communicate with the pipe connection part of the discharge port, the discharge pulsation can be prevented.

1 . A compressor having at least a housing constituted of a front head, a cylinder block and a rear head, a compression mechanism that is driven as a drive shaft passing through said front head rotates, a suction chamber formed at said rear head, at which an inlet of said compression mechanism opens and a discharge chamber formed at said rear head, at which a discharge port of said compression mechanism opens, characterized in that: 
 either one of said suction chamber and said discharge chamber is formed toward the center of said rear head and the other chamber that is not formed toward the center is formed further outward at said rear head;    a tunnel-shaped communication path passing through said suction chamber or said discharge chamber formed toward the center of said rear head and the other chamber formed further outward at said rear head to communicate said suction chamber and said discharge chamber with a corresponding port is formed; and    a muffler space is formed between said communication path and a pipe connection part at which said port is mounted.    
     
     
         2 . A compressor according to  claim 1 , characterized in that: 
 said muffler space communicates with an outer end of said communication path.    
     
     
         3 . A compressor according to  claim 1 , characterized in that: 
 a tunnel portion defining said communication path is formed as an integrated part of said rear head.    
     
     
         4 . A compressor according to  claim 1  or  claim 2 , characterized in that; 
 a tunnel portion defining said communication path is formed by inserting a separate pipe member at said rear head.  
 
     
     
         5 . A compressor according to any one of claims  1  through  4 , characterized in that: 
 a small hole communicating with said communication path is formed at the furthest end of said muffler space to allow oil remaining in said muffler space to flow back into said communication path.  
 
     
     
         6 . A compressor according to any of one of claims  1  through  5 , characterized in that; 
 said compression mechanism comprises at least;  
 a plurality of cylinders formed at said cylinder block, each having an inlet to communicate with said suction chamber and an outlet to communicate with said discharge chamber, pistons each slidably inserted at one of said cylinders so as to freely move reciprocally, a rotary cam plate that rotates together with said drive shaft and causes a reciprocal movement of said pistons and a volumetric capacity varying mechanism capable of varying the angle of said rotary cam plate.  
 
     
     
         7 . A compressor according to any one of claims  1  through  6 , characterized in that: 
 said communication path is constituted as a suction path.  
 
     
     
         8 . A compressor according to  claim 7 , characterized in that: 
 a valve mechanism capable of opening/closing said suction path in response to an external signal is provided at said suction path.    
     
     
         9 . A compressor according to  claim 8  characterized in that: 
 said small hole opens toward the upstream side of said mechanism.