Compressor

Abstract

A compressor includes a motor, a compression mechanism including a compression chamber, and an injection mechanism including an introduction port and a check valve mechanism. The check valve mechanism includes a leaf spring, valve having a frame portion fitting an inner peripheral wall of the introduction port, a valve end portion located inside the frame portion, and a neck portion connecting the valve end portion and the frame portion together. The leaf spring valve opens the introduction port by being elastically deformed. A valve retainer is disposed between a leaf spring valve and an outflow opening surface of the introduction port. The valve end portion of the leaf spring valve in an open state contacts the valve retainer. The valve retainer is shaped to expose part of the valve end portion in the open state to the outflow opening surface of the introduction port.

1 . A compressor comprising:
 an electric motor;   a compression mechanism including a compression chamber, the compression chamber being configured to compress a fluid and to be driven by the electric motor; and   an injection mechanism including an introduction port and a check valve mechanism, the introduction port opening in the compression chamber, the check valve mechanism opening and closing the introduction port, and the injection mechanism introducing the fluid having an intermediate pressure from the introduction port to the compression chamber,   the check valve mechanism including
 a leaf spring valve having
 a frame portion fitting an inner peripheral wall of the introduction port, 
 a valve end portion located inside the frame portion, and 
 a neck portion connecting the valve end portion and the frame portion together, 
 the leaf spring valve opening the introduction port by being elastically deformed, and 
 
 a valve retainer disposed between the leaf spring valve and an outflow opening surface of the introduction port, the valve end portion of the leaf spring valve in an open state contacting the valve retainer, and 
 the valve retainer being shaped to expose part of the valve end portion in the open state to the outflow opening surface of the introduction port. 
   
     
     
         2 . The compressor of  claim 1 , wherein
 the valve retainer is shaped to expose at least a central portion of the valve end portion in the open state to the outflow opening surface of the introduction port.   
     
     
         3 . The compressor of  claim 1 , wherein
 the valve retainer has an abutment portion, the valve end portion in the open state contacting the abutment portion, and   the abutment portion has an opening or a cutout through which the valve end portion is exposed.   
     
     
         4 . The compressor of  claim 3 , wherein
 the abutment portion includes an annular member having the opening therein.   
     
     
         5 . The compressor of  claim 3 , wherein the valve retainer includes
 a cylindrical portion having a cylindrical shape that fits the inner peripheral wall of the introduction port, the cylindrical portion surrounding the abutment portion, and   a coupling portion coupling the cylindrical portion and the abutment portion together.   
     
     
         6 . The compressor of  claim 5 , wherein
 the coupling portion includes a plurality of ribs extending in a radial direction between the abutment portion and the cylindrical portion, and   a fluid flow hole is formed between the cylindrical portion, the abutment portion, and the plurality of ribs.   
     
     
         7 . The compressor of  claim 5 , wherein
 the cylindrical portion includes
 a body portion having a cylindrical shape, and 
 an annular flange extending outward in the radial direction from an upstream-side end of the body portion, and 
   the inner peripheral wall of the introduction port has
 a large-diameter portion in which the flange is fitted, and 
 a small-diameter portion located between the large-diameter portion and the outflow opening surface of the introduction port, and the body portion is fitted in the small-diameter portion. 
   
     
     
         8 . The compressor of  claim 3 , wherein
 the abutment portion includes an inclined surface extending along the valve end portion in the open state.   
     
     
         9 . The compressor of  claim 1 , wherein
 in the leaf spring valve, an arc-shaped cutout is formed in at least one of   a side edge of a connecting portion between the frame portion and   the neck portion or a connecting portion between the neck portion and the valve end portion.   
     
     
         10 . The compressor of  claim 1 , wherein
 the compression mechanism includes a cylinder forming the compression chamber and a piston arranged to eccentrically rotate inside the cylinder.   
     
     
         11 . The compressor of  claim 2 , wherein
 the valve retainer has an abutment portion, the valve end portion in the open state contacting the abutment portion, and   the abutment portion has an opening or a cutout through which the valve end portion is exposed.   
     
     
         12 . The compressor of  claim 2 , wherein
 in the leaf spring valve, an arc-shaped cutout is formed in at least one of
 a side edge of a connecting portion between the frame portion and 
 the neck portion or a connecting portion between the neck portion and valve end portion. 
   
     
     
         13 . The compressor of  claim 3 , wherein
 in the leaf spring valve, an arc-shaped cutout is formed in at least one of
 a side edge of a connecting portion between the frame portion and 
 the neck portion or a connecting portion between the neck portion and the valve end portion. 
   
     
     
         14 . The compressor of  claim 4 , wherein
 the valve retainer includes
 a cylindrical portion having a cylindrical shape that fits the inner peripheral wall of the introduction port, the cylindrical portion surrounding the abutment portion, and 
 a coupling portion coupling the cylindrical portion and the abutment portion together. 
   
     
     
         15 . The compressor of  claim 4 , wherein
 the abutment portion includes an inclined surface extent valve end portion in the open state.   
     
     
         16 . The compressor of  claim 6 , wherein
 the cylindrical portion includes
 a body portion having a cylindrical shape, and 
 an annular flange extending outward in the radial direction from an upstream-side end of the body portion, and 
   the inner peripheral wall of the introduction port has
 a large-diameter portion in which the flange is fitted, and 
 a small-diameter portion located between the large-diameter portion and the outflow opening surface of the introduction port, and the body portion is fitted in the small-diameter portion. 
   
     
     
         17 . The compressor of  claim 5 , wherein
 the abutment portion includes an inclined surface extending along the valve end portion in the open state.