Double-acting refrigerant compressor

Abstract

A main stopper recess 70 for supporting a protuberance 21 d of an inlet valve 21 during the suction stroke and sub-stopper recesses 71, 72 for supporting side protuberances 21 e, 21 f of the inlet valve 21 during the suction stroke are formed at an opening edge 6 a of the cylinder bore. Due to this construction, even when the area of inlet port 15 is increased, large twisting load is not applied to the inlet valve 21 during the suction stroke, and vibrations of the inlet valve 21 are prevented.

1 . A reciprocating refrigerant compressor including: 
 a cylinder block having a plurality of cylinder bores formed therein,    a cylinder head secured to an end face of said cylinder block via a valve plate,    a low-pressure chamber formed within said cylinder head,    a plurality of inlet ports formed through said valve plate, for communicating between said low-pressure chamber and said cylinder bores, and    a plurality of inlet valves for opening and closing said inlet ports,    said inlet valves each having an inlet port-blocking portion formed to have a generally arcuate shape,    wherein a main stopper recesses is formed at an opening edge of each cylinder bore of said cylinder block, for supporting, during an suction stroke, a central protuberance formed in a central portion of said inlet port-blocking portion of said inlet valve with respect to a direction along an arc of said inlet port-blocking portion in a manner protruding outward in a radial direction of said cylinder bore; and    wherein a plurality of sub-stopper recesses are formed at the opening edge of each cylinder bore of said cylinder block, for supporting, during the suction stroke, side protuberances, respectively, which are formed at opposite ends of said inlet port-blocking portion of said inlet valve with respect to the direction along the arc of said inlet port-blocking portion in a manner protruding outward in a radial direction of said cylinder bore.    
     
     
         2 . A reciprocating refrigerant compressor according to  claim 1 , wherein bottom surfaces of said sub-stopper recesses are sloped.  
     
     
         3 . A reciprocating refrigerant compressor according to  claim 1 , wherein depth of said sub-stopper recesses is made larger than depth of said main stopper recess.  
     
     
         4 . A reciprocating refrigerant compressor according to  claim 1 , wherein bottom surfaces of said sub-stopper recesses are sloped, and 
 wherein depth of said sub-stopper recesses is made larger than depth of said main stopper recess.    
     
     
         5 . A reciprocating refrigerant compressor according to  claim 1 , wherein depth of said sub-stopper recesses is made smaller than depth of said main stopper recess.  
     
     
         6 . A reciprocating refrigerant compressor according to  claim 1 , wherein bottom surfaces of said sub-stopper recesses are sloped, and 
 wherein depth of said sub-stopper recesses is made smaller than depth of said main stopper recess.