Rotary compressor

Abstract

In a rotary compressor, when it is assumed that a vane width is W, the amount of eccentricity of an eccentric portion is e, a vane leading end curvature radius is R v , an annular piston radius is R ro , and a non-sliding region width on each of both side portions of a vane leading end is W t , the vane width W and the vane leading end curvature radius R v are set such that the non-sliding region width W t on each of both the side portions of the vane leading end defined by the following equation (A) is a value satisfying an equation (B): W t =( W /2)− e×R v /( R v +R ro )  (A) 0.3 mm≦ W t ≦0.6 mm  (B).

1 . A rotary compressor comprising:
 a vertically placed and sealed compressor housing including a discharge portion of a refrigerant on an upper portion and a suction portion of the refrigerant on a lower side surface;   a compression unit arranged on a lower portion of the compressor housing and including an annular cylinder, an end plate that has a bearing portion and a discharge valve portion and closes one end portion of the cylinder, an end plate or an intermediate partition plate that has a bearing portion and closes the other end portion of the cylinder, an annular piston that is fitted into an eccentric portion of a rotating axis supported on the bearing portion, revolves in the cylinder along a cylinder inner wall of the cylinder, and forms an operation chamber between the annular piston and the cylinder inner wall, and a vane that projects into the operation chamber from a vane groove provided in the cylinder, abuts against the annular piston, and divides the operation chamber into a suction chamber and a compression chamber; and   a motor that is arranged on an upper portion of the compressor housing and drives the compression unit through the rotating axis,   the rotary compressor sucking the refrigerant through the suction portion and discharging the refrigerant after passing through the compressor housing from the discharge portion, wherein   when it is assumed that a vane width is W, the amount of eccentricity of the eccentric portion is e, a vane leading end curvature radius is R v , an annular piston radius is R ro , and a non-sliding region width on each of both side portions of a vane leading end is W t , the vane width W and the vane leading end curvature radius R v  are set such that the non-sliding region width W t  on each of both the side portions of the vane leading end defined by the following equation (A) is a value satisfying an equation (B):
     W   t =( W/ 2)− e×R   v /( R   v   +R   ro )  (A)
 
   0.3 mm≦ W   t ≦0.6 mm  (B).
 
   
     
     
         2 . The rotary compressor according to  claim 1 , wherein the refrigerant is an R32 refrigerant or a mixed refrigerant containing the R32 refrigerant of at least equal to or higher than 25% by weight.