Reciprocating Compressor

Abstract

A reciprocating compressor includes a piston which compresses air by, while rocking, reciprocatingly moving in a cylinder and a sealing member which is fitted in a groove formed on the piston for sealing between the cylinder and the piston. In the reciprocating compressor: the sealing member has a bottom portion to be fitted in the groove formed on the piston and a side portion provided radially outwardly of the piston; and the side portion includes a bent portion so as to reduce a gap between an upper end portion thereof and the piston.

What is claimed is: 
     
         1 . A reciprocating compressor, comprising:
 a piston which compresses air by, while rocking, reciprocatingly moving in a cylinder; and   a sealing member which is fitted in a groove formed on the piston for sealing between the cylinder and the piston,   wherein the sealing member has a bottom portion to be fitted in the groove formed on the piston and a side portion provided radially outwardly of the piston, and   wherein the side portion includes a bent portion so as to reduce a gap between an upper end portion thereof and the piston.   
     
     
         2 . The reciprocating compressor according to  claim 1 , wherein an angle formed between a base end side of the side portion and the axial direction of the piston is larger than a rocking angle of the piston. 
     
     
         3 . The reciprocating compressor according to  claim 1 , wherein the bottom portion of the sealing member is prevented from moving outwardly of the groove formed on the piston. 
     
     
         4 . The reciprocating compressor according to  claim 1 , wherein the side portion includes a plurality of bends. 
     
     
         5 . The reciprocating compressor according to  claim 1 , wherein the bent portion of the sealing member has a curved inner side surface. 
     
     
         6 . The reciprocating compressor according to  claim 1 , wherein an inner side surface between the side portion and the bottom portion is curved. 
     
     
         7 . A reciprocating compressor comprising:
 a piston which compresses air by, while rocking, reciprocatingly moving in a cylinder; and   a sealing member which is fitted in a groove formed on the piston for sealing between the cylinder and the piston,   wherein the sealing member has a bottom portion to be fitted in the groove formed on the piston and a side portion provided radially outwardly of the piston, and   wherein the side portion includes a plurality of bends causing a first angle formed between an upper end side of the side portion and the axial direction of the piston to be smaller than a second angle formed between a base end side of the side portion and the axial direction of the piston.   
     
     
         8 . The reciprocating compressor according to  claim 7 , wherein the second angle formed between the base end side of the side portion and the axial direction of the piston is larger than a rocking angle of the piston. 
     
     
         9 . The reciprocating compressor according to  claim 7 , wherein the bottom portion of the sealing member is prevented from moving outwardly of the groove formed on the piston. 
     
     
         10 . The reciprocating compressor according to  claim 7 , wherein the plurality of bends have a curved inner side surface. 
     
     
         11 . The reciprocating compressor according to  claim 7 , wherein an inner side surface between the side portion and the bottom portion is curved.