Reciprocating Compressor And Fluid Injection System

Abstract

A compressor includes a cylinder, a sleeve assembly disposed in the cylinder, and a piston disposed within the sleeve assembly. The sleeve assembly includes a sleeve and a collar. The sleeve and the collar cooperate to define a plurality of ports. The piston is movable between a first position and a second position and is configured to compress a working fluid from a suction pressure at the first position to a discharge pressure at the second position. The piston and the sleeve assembly cooperate to selectively permit working fluid at an intermediate pressure to enter the cylinder. The intermediate pressure is greater than the suction pressure and less than the discharge pressure.

What is claimed is: 
     
         1 . A compressor comprising:
 a cylinder;   a sleeve assembly disposed in the cylinder, the sleeve assembly including a sleeve and a collar, wherein the sleeve and the collar cooperate to define a plurality of ports; and   a piston disposed within the sleeve assembly, the piston movable between a first position and a second position and configured to compress a working fluid from a suction pressure at the first position to a discharge pressure at the second position,   wherein the piston and the sleeve assembly cooperate to selectively permit working fluid at an intermediate pressure to enter the cylinder, and   wherein the intermediate pressure is greater than the suction pressure and less than the discharge pressure.   
     
     
         2 . The compressor of  claim 1 , wherein the sleeve includes:
 a hollow body including an annular wall extending between a first end and a second end, the hollow body including an inner surface and an outer surface opposite the inner surface,   a flange extending radially outward from the first end of the annular wall,   a step positioned between a first portion of the hollow body and a second portion of the hollow body, wherein a diameter of the outer surface of the first portion is greater than a diameter of the outer surface of the second portion,   a plurality of recesses defined in the first portion, and   a plurality of apertures defined in the second portion.   
     
     
         3 . The compressor of  claim 2 , wherein the collar includes:
 an annular member extending between a first end and a second end and including an outer surface and an inner surface opposite the outer surface,   a first plurality of protrusions extending axially from the second end,   a second plurality of protrusions extending axially from the first end, and   a plurality of depressions defined in the inner surface, each of the plurality of depressions positioned between each of the first plurality of protrusions.   
     
     
         4 . The compressor of  claim 3 , wherein a shape of the second plurality of protrusions of the collar is complimentary to a shape of the plurality of recesses of the sleeve. 
     
     
         5 . The compressor of  claim 3 , wherein the first end of the collar is in contact with the step of the sleeve and the second plurality of protrusions of the collar are received in the plurality of recesses of the sleeve. 
     
     
         6 . The compressor of  claim 5 , wherein the plurality of depressions of the collar are aligned with and spaced apart from the plurality of apertures of the sleeve. 
     
     
         7 . The compressor of  claim 6 , wherein the plurality of depressions of the collar and the plurality of apertures of the sleeve cooperate to define the plurality of ports. 
     
     
         8 . The compressor of  claim 1 , wherein the piston includes a hollow cylindrical body including a top wall and a side wall extending perpendicularly from the top wall, and wherein the top wall defines a plurality of chamfered recesses. 
     
     
         9 . The compressor of  claim 8 , wherein the plurality of chamfered recesses extend radially inward from a perimeter of the top wall at an angle relative to the side wall. 
     
     
         10 . The compressor of  claim 9 , wherein the angle is greater than or equal to about 15 degrees to less than or equal to about 45 degrees. 
     
     
         11 . The compressor of  claim 8 , wherein the plurality of chamfered recesses are aligned with the plurality of ports. 
     
     
         12 . The compressor of  claim 1 , wherein when the piston is in the first position, the working fluid at the intermediate pressure enters the cylinder through the plurality of ports. 
     
     
         13 . The compressor of  claim 1 , wherein when the piston is in the second position, the working fluid at the intermediate pressure is restricted from entering the cylinder. 
     
     
         14 . The compressor of  claim 1 , further comprising a housing and a housing cover fixed to the housing. 
     
     
         15 . The compressor of  claim 14 , wherein the housing cover defines an intermediate-fluid port fluidly connected to the plurality of ports, the intermediate-fluid port being configured to receive the fluid at the intermediate pressure. 
     
     
         16 . The compressor of  claim 14 , further comprising a valve in fluid communication with an intermediate-fluid port, wherein the intermediate-fluid port is fluidly connected to the plurality of ports, and wherein the intermediate-fluid port is configured to receive the fluid at the intermediate pressure.