Reciprocating compressor

Abstract

A reciprocating compressor comprises a cylinder having a cylinder side gas flow path for guiding refrigerant discharged to the discharge space to an inner circumferential surface of the cylinder and a piston having a piston side gas flow path communicating with the cylinder side gas flow path to distribute and supply the refrigerant guided through the cylinder side gas flow path between the cylinder and the piston. Also, an outlet of the gas flow path is formed in the piston and an inlet of the gas flow path is formed in the cylinder.

1 . A reciprocating compressor comprising:
 a cylinder having a compression space;   a piston inserted into the compression space and reciprocating relative to the cylinder;   a discharge valve configured to be attachable to and detachable from a front end surface of the cylinder and selectively opening and closing the compression space of the cylinder; and   a discharge cover having a discharge space to selectively communicate with the compression space,   wherein the cylinder has a cylinder side gas flow path for guiding refrigerant discharged to the discharge space to an inner circumferential surface of the cylinder, and   the piston has a piston side gas flow path communicating with the cylinder side gas flow path to distribute and supply the refrigerant guided through the cylinder side gas flow path between the cylinder and the piston.   
     
     
         2 . The reciprocating compressor of  claim 1 , wherein the cylinder side gas flow path comprises:
 at least one gas inlet opening formed in a reciprocating direction of the piston on a front end surface of the cylinder; and   a gas pocket formed in an annular shape on the inner circumferential surface of the cylinder to communicate with the gas inlet opening.   
     
     
         3 . The reciprocating compressor of  claim 2 , wherein an inlet of the gas inlet opening is formed at a greater distance than the radius of the discharge valve relative to the center of the discharge valve. 
     
     
         4 . The reciprocating compressor of  claim 1 , wherein the piston side gas flow path comprises:
 a gas communication opening formed on an outer circumferential surface of the piston to correspond to the cylinder side gas flow path;   a gas guide groove formed in an annular shape to communicate with the gas communication opening; and   a bearing hole communicating with the gas guide groove and penetrated from at least one side of the gas communication opening toward a bearing surface of the cylinder and the piston.   
     
     
         5 . The reciprocating compressor of  claim 4 , wherein the width of the gas guide groove is greater than the width of the gas communication opening with respect to the reciprocating direction of the piston. 
     
     
         6 . The reciprocating compressor of  claim 4 , wherein at least one gas communication opening and at least one bearing hole are respectively formed along a circumferential direction, and
 the bearing hole has a smaller size than the gas communication opening.   
     
     
         7 . The reciprocating compressor of  claim 4 , wherein the piston comprises:
 a piston body; and   a gas guide member inserted and coupled to an outer circumferential surface of the piston body at a predetermined interval therefrom so as to form the gas guide groove,   wherein the gas communication opening and the bearing hole are formed in the gas guide member.   
     
     
         8 . The reciprocating compressor of  claim 7 , wherein a gas diffusion groove having a larger surface area than the surface area of the bearing hole is further formed on an outer circumferential surface of the gas guide member. 
     
     
         9 . The reciprocating compressor of  claim 8 , wherein the gas diffusion groove communicates with at least either one of the gas communication opening and the bearing hole. 
     
     
         10 . The reciprocating compressor of  claim 1 , wherein either the cylinder or the piston is coupled a reciprocating mover of a reciprocating motor,
 the mover is elastically supported by resonant springs, and   the resonant springs are formed as compression coil springs and respectively provided on both front and back sides of the mover in the reciprocating direction.   
     
     
         11 . A reciprocating compressor comprising:
 a cylinder having a compression space and gas flow paths for introducing gas in the compression space to an inner circumferential surface;   a piston inserted into the compression space and reciprocating relative to the cylinder;   a discharge valve configured to be attachable to and detachable from a front end surface of the cylinder and selectively opening and closing the compression space of the cylinder; and   a discharge cover having a discharge space to selectively communicate with the compression space,   the piston comprising:   a piston body having a gas guide groove having a predetermined depth formed on an outer circumferential surface; and   a gas guide member inserted and coupled to the outer circumferential surface of the piston body so as to open the gas guide groove,   wherein a gas communication opening is formed in the gas guide member to allow the gas flow paths of the cylinder and the gas guide groove of the piston to communicate with each other, and a bearing hole is formed at one side of the gas communication opening to allow the gas guide groove and an bearing surface between the cylinder and the piston to communicate with each other.   
     
     
         12 . The reciprocating compressor of  claim 11 , wherein a gas diffusion groove having a larger surface area than the surface area of the bearing hole is further formed on an outer circumferential surface of the gas guide member. 
     
     
         13 . The reciprocating compressor of  claim 12 , wherein the gas diffusion groove communicates with at least either one of the gas communication opening and the bearing hole. 
     
     
         14 . The reciprocating compressor of  claim 11 , wherein the width of the gas guide groove is greater than the width of the gas communication opening with respect to the reciprocating direction of the piston. 
     
     
         15 . The reciprocating compressor of  claim 11 , wherein at least one gas communication opening and at least one bearing hole are respectively formed along a circumferential direction, and
 the bearing hole has a smaller size than the gas communication opening.   
     
     
         16 . The reciprocating compressor of  claim 11 , wherein the cylinder side gas flow path comprises:
 at least one gas inlet opening formed in a reciprocating direction of the piston on a front end surface of the cylinder; and   a gas pocket formed in an annular shape on the inner circumferential surface of the cylinder to communicate with the gas inlet opening.   
     
     
         17 . The reciprocating compressor of  claim 16 , wherein an inlet of the gas inlet opening is formed at a greater distance than the radius of the discharge valve relative to the center of the discharge valve. 
     
     
         18 . The reciprocating compressor of  claim 1 , wherein either the cylinder or the piston is coupled a reciprocating mover of a reciprocating motor,
 the mover is elastically supported by resonant springs, and   the resonant springs are formed as compression coil springs and respectively provided on both front and back sides of the mover in the reciprocating direction.