Rotary compressor

Abstract

A rotary compressor includes a coil spring to press a vane against a roller, and the contact area between the vane and a vane groove is secured by a simple and inexpensive construction, whereby the compressor size is decreased while the leakage of working fluid is restrained. The rotary compressor includes a closed vessel, a cylinder having a vane groove, which is located in the closed vessel, and a shaft having an eccentric portion. A roller is rotatably fitted on the eccentric portion of the shaft to eccentrically rotate in the cylinder. A vane is provided in the vane groove in the cylinder to reciprocate in the vane groove while a tip end thereof is in contact with the roller, and the coil spring is provided for pressing the vane against the roller. The vane is provided with a spring hole on the side opposite to the side on which the vane is in contact with the roller, and the spring hole contains at least a part of the coil spring.

1 . A rotary compressor characterized in comprising, a closed vessel; a cylinder having a vane groove, said cylinder located in said closed vessel; a shaft having an eccentric portion; a roller which is rotatably fitted on the eccentric portion of said shaft to eccentrically rotate in said cylinder; a vane provided in the vane groove in said cylinder to reciprocate in said vane groove while a tip end thereof is in contact with said roller; and a spring mechanism or spring mechanisms for pressing said vane against said roller, wherein said vane is provided with a spring hole or spring holes on a side opposite to a side on which said vane is in contact with said roller, and said spring hole or said spring holes is accommodated in a cross section of said vane perpendicular to a direction of reciprocation of said vane, and contains at least a part of said spring mechanism.  
   
   
       2 . The rotary compressor according to  claim 1 , characterized in that a plurality of spring mechanisms are provided; said vane is provided with a plurality of spring holes in the same number as said spring mechanisms; and at least a part of each of said spring mechanisms is contained in each of said spring holes.  
   
   
       3 . The rotary compressor according to  claim 1 , characterized in that said spring mechanism consists of a coil spring.  
   
   
       4 . The rotary compressor according to  claim 3 , characterized in that one end of said coil spring is contained in the spring hole in said vane, and a seat with which the other end of said coil spring is in contact is provided with a coil spring guide mechanism.  
   
   
       5 . The rotary compressor according to  claim 4 , characterized in that said coil spring guide mechanism is provided on an inside side surface of said closed vessel.  
   
   
       6 . The rotary compressor according to  claim 3 , characterized in that a width of said vane is set so as to be not smaller than 3.0 mm and not larger than 3.5 mm; a stroke of reciprocation of said vane is set so as to be not shorter than 3.0 mm and not longer than 5.0 mm; a diameter of said coil spring is set so as to be not smaller than 2.0 mm and smaller than the width of said vane; and a free length of said coil spring is set so as to be not larger than five times the diameter thereof.  
   
   
       7 . The rotary compressor according to  claim 1 , characterized in that a working fluid is carbon dioxide.