Rotary compressor

Abstract

It was found that a refrigerant mainly containing a carbon-carbon double bond-containing hydrofluoroolefin has a function to suppress abrasive wear, compared to conventional HFC-based refrigerants, because the hydrofluoroolefin generates iron fluoride especially on the surface of the vane and piston, where sliding force is severe, from hydrogen fluoride, even if it is generated in reaction with water and oxygen. It is possible to reduce abrasive wear, by using a refrigerant containing as the base component a hydrofluoroolefin as operating refrigerant and a refrigeration oil 3 miscible with the refrigerant and a vane 10 made of a high-speed tool steel and sintered and quenched, because hydrogen fluoride generated by decomposition of the refrigerant in the region of a vane tip region 10 a and a piston 9 peripheral surface, where sliding force is severe is converted to iron fluoride. It is also possible to obtain a hardened structure containing carbides of W, Mo, Cr and V dispersed in a fine martensite matrix and produces the rotary compressor more cost-effectively by quenching and sintering the vane 10.

1 . A rotary compressor, comprising:
 a refrigerant containing a carbon-carbon double bond-containing hydrofluoroolefin as the base component and used as operating refrigerant;   a refrigeration oil miscible with the refrigerant; and   a compressing mechanism unit having a piston and a vane in a cylinder, the vane being made of a high-speed tool steel and nitridized or made of a sintered alloy steel and sintered and quenched.   
     
     
         2 . A rotary compressor, comprising:
 a refrigerant containing a carbon-carbon double bond-containing hydrofluoroolefin as the base component and used as operating refrigerant;   a refrigeration oil miscible with the refrigerant;   a motor placed in a tightly sealed container;   a compressing mechanism unit having a shaft driven by the motor, the compressing mechanism unit having bearings on both faces of a cylinder;   a piston rotated eccentrically by the shaft installed in the cylinder;   a vane partitioning the cylinder into a suction chamber and a compression chamber and having its tip pressed to the peripheral surface of the piston, the vane being made of a high-speed tool steel and nitridized or made of a sintered alloy steel and sintered and quenched.   
     
     
         3 . The rotary compressor according to  claim 1 , wherein the sintered alloy steel is a high-speed tool steel. 
     
     
         4 . The rotary compressor according to  claim 1 , wherein the refrigeration oil is polyvinylethers, polyol esters or polyalkylene glycols. 
     
     
         5 . The rotary compressor according to  claim 1 , wherein the refrigeration oil contains no extreme pressure additive. 
     
     
         6 . The rotary compressor according to  claim 2 , wherein the sintered alloy steel is a high-speed tool steel. 
     
     
         7 . The rotary compressor according to  claim 2 , wherein the refrigeration oil is polyvinylethers, polyol esters or polyalkylene glycols. 
     
     
         8 . The rotary compressor according to  claim 2 , wherein the refrigeration oil contains no extreme pressure additive.