Rotary compressor having semicircular-step-snap enlarged diameter portion in groove portion of end plate closing end portion of cylinder

A rotary compressor comprising:

• a hermetic vertical compressor housing including:
• a discharge unit that discharges refrigerant provided in an upper portion of the housing;
• and
• a suction unit for the refrigerant is provided in a lower portion of a side surface of the housing;
• a compressing unit that is arranged in a lower portion of the compressor housing, the compressing unit including:
• an annular cylinder;
• an end plate that includes a bearing portion and a discharge valve portion and closes an end portion of the cylinder;
• an annular piston that is fitted to an eccentric portion of a rotating shaft supported by the bearing portion, revolves in the cylinder along a cylinder inner-wall of the cylinder, and forms an operating chamber between the annular piston and the cylinder inner-wall;
• and
• a vane that comes into contact with the annular piston by projecting into the operating chamber from an inside of a vane groove of the cylinder and divides the operating chamber into a suction chamber and a compression chamber, and that draws a refrigerant through the suction unit and discharges a refrigerant from the discharge unit through an inside of the compressor housing;
• and
• a motor that is arranged in an upper portion of the compressor housing and drives the compressing unit via the rotating shaft,
• wherein the end plate has a groove portion accommodating the discharge valve portion that includes a reed valve type discharge valve and a discharge-valve limiter that are attached to the groove portion with a rivet,
• the groove portion has a rivet-side enlarged diameter portion which is formed into a semicircular step shape, and a diameter of the rivet-side enlarged diameter portion other than a bottom side of the rivet-side enlarged diameter portion is larger than a diameter of the bottom side, and
• a relationship hm−(tv+0.4to)≧hz≧hm−(tv+0.8to) is satisfied,
• where hm is a depth down to a bottom of the groove portion, hz is a depth down to a step portion of the semicircular step, tv is a thickness of the discharge valve, and to is a thickness of the discharge-valve limiter.