Reciprocating compressor

Abstract

According to the present invention, a recess ( 25 ) which is induction means is provided in a top end surface ( 24 ) of a piston ( 16 ), the recess ( 25 ) guides working fluid ( 3 ) staying near an inner peripheral surface of a compression chamber ( 13 ) from an outer peripheral edge of the top end surface ( 24 ) toward an opposite position of the top end surface ( 24 ) facing a discharge hole ( 19 ), and the recess ( 25 ) smoothens discharging motion of working fluid ( 3 ) from the discharge hole ( 19 ).

1 . A reciprocating compressor comprising an electromotive element and a compressing element driven by the electromotive element housed in a container, the compressing element including a cylinder block constituting a compression chamber, a piston movable in reciprocating motion in the compression chamber, and a valve plate disposed to close an open end of the compression chamber and having a discharge hole communicating between inside and outside of the compression chamber are in communication with each other, induction means is provided on a top end surface confronting the valve plate for guiding working fluid staying near an inner peripheral surface of the compression chamber from an outer peripheral edge of the top end surface toward an opposite position of the top end surface facing the discharge hole. 
     
     
         2 . The reciprocating compressor according to  claim 1 , wherein the induction means is a recess of a predetermined width extending from the outer peripheral edge of the piston toward the opposite position of the top end surface acing the discharge hole. 
     
     
         3 . The reciprocating compressor according to  claim 2 , wherein a bottom surface of the recess is inclined in a manner to increase a distance from the valve plate toward the opposite position of the top end surface of the piston facing the discharge hole. 
     
     
         4 . The reciprocating compressor according to  claim 2 , wherein the recess is provided along a diametric direction of the top end surface through the opposite position facing the discharge hole, the recess extends from the outer peripheral edge of the top end surface farthest from the discharge hole to the opposite position. 
     
     
         5 . The reciprocating compressor according to  claim 3 , wherein the recess is provided along a diametric direction of the top end surface through the opposite position facing the discharge hole, the recess extends from the outer peripheral edge of the top end surface farthest from the discharge hole to the opposite position. 
     
     
         6 . The reciprocating compressor according to  claim 2 , further comprising a plurality of recesses formed radially around the opposite position of the top end surface facing the discharge hole. 
     
     
         7 . The reciprocating compressor according to  claim 3 , further comprising a plurality of recesses formed radially around the opposite position of the top end surface facing to the discharge hole. 
     
     
         8 . The reciprocating compressor according to  claim 1 , wherein the induction means is a flat inclined surface formed in a manner to increase a distance from the valve plate as the surface extends from the outer peripheral edge of the piston farthest from the opposite position of the top end surface facing the discharge hole toward the opposite position. 
     
     
         9 . The reciprocating compressor according to  claim 1 , further comprising a projection provided at the opposite position of the top end surface of the piston facing the discharge hole, wherein the projection enters the discharge hole in the valve plate when the piston reaches a top dead center.