Reciprocating Compressor

Abstract

A reciprocating compressor provided with a piston, which is compact and having high sealing performance is provided. A reciprocating compressor includes: a low-pressure compressor unit having a low-pressure piston and a low-pressure cylinder for compressing air with the low-pressure piston reciprocating while oscillating within the low-pressure cylinder; a high-pressure compressor unit having a high-pressure piston and a high-pressure cylinder for further compressing the air compressed in the low-pressure compressor unit with the high-pressure piston reciprocating while oscillating within the high-pressure cylinder; and a motor for driving the low-pressure compressor unit and the high-pressure compressor unit. A maximum tilt angle during oscillation of the low-pressure piston is made larger than a maximum tilt angle during oscillation of the high-pressure piston.

1 . A reciprocating compressor comprising:
 a low-pressure compressor unit having a low-pressure piston and a low-pressure cylinder for compressing air with the low-pressure piston reciprocating while oscillating within the low-pressure cylinder;   a high-pressure compressor unit having a high-pressure piston and a high-pressure cylinder for further compressing the air compressed in the low-pressure compressor unit with the high-pressure piston reciprocating while oscillating within the high-pressure cylinder; and   a motor for driving the low-pressure compressor unit and the high-pressure compressor unit,   wherein a maximum tilt angle during oscillation of the high-pressure piston is prevented from becoming larger than a maximum tilt angle during oscillation of the low-pressure piston.   
     
     
         2 . The reciprocating compressor according to  claim 1 , wherein a maximum gap formed between the high-pressure piston and the high-pressure cylinder during oscillation of the high-pressure piston is prevented from becoming larger than a maximum gap formed between the low-pressure piston and the low-pressure cylinder during oscillation of the low-pressure piston. 
     
     
         3 . The reciprocating compressor according to  claim 1 , wherein the low-pressure piston and the high-pressure piston each include: an eccentric portion coupled to a rotating shaft of the motor for performing rotational motion; a piston body for compressing air within the cylinder; and a connecting rod for connecting the eccentric portion and the piston body, the piston body being fixed to the connecting rod. 
     
     
         4 . The reciprocating compressor according to  claim 3 , wherein the piston body performs oscillating motion with the rotational motion of the eccentric portion. 
     
     
         5 . The reciprocating compressor according to  claim 1 , wherein a bore diameter of the high-pressure piston is prevented from being made larger than a bore diameter of the low-pressure piston. 
     
     
         6 . The reciprocating compressor according to  claim 3 , wherein a length from a center of the eccentric portion to a leading end of the low-pressure piston and a length from a center of the eccentric portion to a leading end of the high-pressure piston are made subequal. 
     
     
         7 . The reciprocating compressor according to  claim 1 , wherein the low-pressure piston and the high-pressure piston each include a piston body for compressing air within the cylinder, and
 wherein the piston body of the low-pressure piston is provided with a lip ring, and the piston body of the high-pressure piston is provided with a piston ring.   
     
     
         8 . The reciprocating compressor according to  claim 1 , wherein the low-pressure piston and the high-pressure piston each include a piston body for compressing air within the cylinder, and
 wherein the piston body of the low-pressure piston is provided with a piston ring, and the piston body of the high-pressure piston is provided with a piston ring.   
     
     
         9 . A reciprocating compressor comprising:
 a motor having a rotating shaft;   a low-pressure compressor unit having a low-pressure cylinder and a low-pressure piston for compressing air; and   a high-pressure compressor unit having a high-pressure cylinder and a high-pressure piston for further compressing the air compressed in the low-pressure compressor unit,   the low-pressure piston and the high-pressure piston each including: an eccentric portion for performing eccentric motion with rotation of the rotating shaft of the motor; a connecting rod extending from the eccentric portion; and a piston body provided on a leading end of the connecting rod,   wherein, when an eccentric amount of the eccentric portion of the low-pressure piston with respect to the rotating shaft of motor is represented by r 1  and an eccentric amount of the eccentric portion of the high-pressure piston with respect to the rotating shaft of motor is represented by r 2 , the low- and high-pressure pistons are formed in such a manner that r 1 >r 2  is established.   
     
     
         10 . The reciprocating compressor according to  claim 9 , wherein a maximum gap formed between the high-pressure piston and the high-pressure cylinder during oscillation of the high-pressure piston is made smaller than a maximum gap formed between the low-pressure piston and the low-pressure cylinder during oscillation of the low-pressure piston. 
     
     
         11 . The reciprocating compressor according to  claim 9 , wherein the low-pressure piston and the high-pressure piston each include the piston body fixed to the connecting rod. 
     
     
         12 . The reciprocating compressor according to  claim 9 , wherein the respective piston bodies reciprocate while oscillating within the high- and low-pressure cylinders with eccentric motion of the eccentric portion. 
     
     
         13 . The reciprocating compressor according to  claim 9 , wherein a bore diameter of the high-pressure piston is made smaller than a bore diameter of the low-pressure piston. 
     
     
         14 . The reciprocating compressor according to  claim 9 , wherein, when a length from a center of the eccentric portion of the low-pressure piston to a leading end of the piston body of the low-pressure piston is represented by l 1  and a length from a center of the eccentric portion of the high-pressure piston to a leading end of the piston body of the high-pressure piston is represented by l 2 , the low- and high-pressure pistons are formed so that r 1 /l 1 >r 2 /l 2  is established. 
     
     
         15 . The reciprocating compressor according to  claim 9 , wherein the piston body of the low-pressure piston is provided with a lip ring, and the piston body of the high-pressure piston is provided with a piston ring. 
     
     
         16 . The reciprocating compressor according to  claim 9 , wherein the piston body of the low-pressure piston is provided with a piston ring, and the piston body of the high-pressure piston is provided with a piston ring. 
     
     
         17 . The reciprocating compressor according to  claim 2 , wherein the low-pressure piston and the high-pressure piston each include: an eccentric portion coupled to a rotating shaft of the motor for performing rotational motion; a piston body for compressing air within the cylinder; and a connecting rod for connecting the eccentric portion and the piston body, the piston body being fixed to the connecting rod. 
     
     
         18 . The reciprocating compressor according to  claim 10 , wherein the low-pressure piston and the high-pressure piston each include the piston body fixed to the connecting rod.