Structure for oil recovery in a compressor

Abstract

In a structure for oil recovery in a compressor for separating oil from refrigerant and supplying the separated oil into the compressor through an oil supply passage, the compressor includes a rotary shaft, a cylinder block having a plural cylinder bores, a cam member rotated integrally with the rotary shaft, a piston received in each cylinder bore being operable in conjunction with the rotation of the rotary shaft through the cam member, a suction port for allowing the refrigerant to be drawn from a suction-pressure region of the compressor to the corresponding cylinder bore, a discharge port for allowing the refrigerant to be discharged from the corresponding cylinder bore to a discharge-pressure region of the compressor, and a flexible reed valve for opening and closing one of the suction port and the discharge port. The oil supply passage is opened and closed in accordance with motion of the reed valve.

1 . A structure for oil recovery in a compressor for separating oil from refrigerant and supplying the separated oil into the compressor, comprising: 
 a rotary shaft;    a cylinder block having a plurality of cylinder bores formed therethrough to be arranged around the rotary shaft;    a cam member rotated integrally with the rotary shaft;    a piston received in each cylinder bore being operable in conjunction with the rotation of the rotary shaft through the cam member;    a suction port for allowing the refrigerant to be drawn from a suction-pressure region of the compressor to the corresponding cylinder bore;    a discharge port for allowing the refrigerant to be discharged from the corresponding cylinder bore to a discharge-pressure region of the compressor;    a flexible reed valve for opening and closing one of the suction port and the discharge port; and    an oil supply passage for allowing the oil to be supplied into the compressor, wherein the oil supply passage is opened and closed in accordance with motion of the reed valve.    
   
   
       2 . The structure according to  claim 1 , wherein the cylinder bores are separated from the suction-pressure region and the discharge-pressure region by a partition plate, the reed valve being movable away from or toward and into contact with a face of the partition plate adjacent to the cylinder bores to open or close the corresponding suction port, an outlet of the oil supply passage being covered by the reed valve when the reed valve closes the suction port.  
   
   
       3 . The structure according to  claim 2 , wherein the outlet of the oil supply passage is divided into two parts which are formed on each side of the reed valve adjacent to the proximal side thereof.  
   
   
       4 . The structure according to  claim 2 , wherein the oil supply passage includes an annular passage which is formed so as to encompass all the cylinder bores, the annular passage being connected to the outlet through an oil supply groove.  
   
   
       5 . The structure according to  claim 2 , wherein the oil supply passage includes an annular passage which is formed so as to entirely surround an axis of the rotary shaft, the annular passage being connected to the outlet through an oil supply groove.  
   
   
       6 . The structure according to  claim 5 , wherein the oil supply groove is radially formed in the face of the partition plate.  
   
   
       7 . The structure according to  claim 5 , wherein the annular passage is formed in the partition plate.  
   
   
       8 . The structure according to  claim 1 , wherein the cylinder bores are separated from the suction-pressure region and the discharge-pressure region by a partition plate, the reed valve being movable away from or toward and into contact with a face of the partition plate on the opposite side to the cylinder bores to open or close the corresponding discharge port, a part of the oil supply passage being provided in the partition plate, a shutter being operable to open and close the part of the oil supply passage provided in the partition plate in conjunction with the motion of the reed valve.  
   
   
       9 . The structure according to  claim 1 , wherein the oil in the oil supply passage is directly supplied into the plural cylinder bores.