Hermetic compressor and refrigeration cycle apparatus

A hermetic compressor comprising:

• an electric motor including a stator and a rotor;
• a cylinder including a compression chamber, an injection vertical hole, and a communicating part, refrigerant being compressed in the compression chamber, the injection vertical hole extending in a height direction and constituting a portion of an injection flow passage through which the refrigerant is supplied into the compression chamber, the communicating part being configured to make the injection vertical hole and the compression chamber communicate with each other;
• a rotary shaft provided in the compression chamber, including an eccentric shaft part, and configured to be rotated by the electric motor, the eccentric shaft part being configured to perform an eccentric motion in the compression chamber;
• a rolling piston provided to the eccentric shaft part;
• a vane configured to partition a space formed by an inner periphery of the cylinder and an outer periphery of the rolling piston into a suction-side space and a compression-side space;
• and
• closing parts fixed to both end surfaces of the cylinder in the height direction to close the compression chamber, wherein
• a closing part of the closing parts that is fixed to one end surface of both end surfaces of the cylinder has a discharge port through which the refrigerant compressed is discharged to an outside of the compression chamber,
• in a phase of the rolling piston in which a pressure of refrigerant in the compression chamber matches a pressure of refrigerant discharged from the discharge port,
• in a plan view, a straight line passes through a region formed by the inner periphery of the cylinder, the outer periphery of the rolling piston, and the vane, the straight line connecting a center of the injection vertical hole and a center of a boundary part between the communicating part and the inner periphery of the cylinder,
• the hermetic compressor further comprises an injection check valve configured to open and close the injection vertical hole,
• another end surface of both end surfaces of the cylinder in the height direction has an injection check valve actuation groove which the injection check valve is disposed, in a plan view, a width of the boundary part between the communicating part and the inner periphery of the cylinder is larger than a width of a boundary part between the communicating part and the injection check valve actuation groove, and in a plan view, the communicating part has a communicating-part wall surface extending along a radial direction, the communicating-part wall surface having an arc shape.

A hermetic compressor comprising:

• a cylinder including a compression chamber, an injection vertical hole, and a communicating part, refrigerant being compressed in the compression chamber, the injection vertical hole extending in a height direction and constituting a portion of an injection flow passage through which the refrigerant is supplied into the compression chamber, the communicating part being configured to make the injection vertical hole and the compression chamber communicate with each other;
• and
• closing parts fixed to both end surfaces of the cylinder in the height direction to close the compression chamber, wherein
• a closing part of the closing parts that is fixed to one end surface of both end surfaces of the cylinder has a discharge port through which the refrigerant compressed is discharged to an outside of the compression chamber,
• a discharge cutout is formed by cutting out a portion of the one end surface of the cylinder at a position close to an inner periphery of the cylinder,
• in a case in which the communicating part and the discharge cutout are disposed at positions that at least partially overlap with each other when the communicating part and the discharge cutout are projected on a same plane in the height direction,
• in a plan view, a straight line passes through a region obtained by projecting the discharge cutout in the height direction of the cylinder, the straight line connecting a center of the injection vertical hole and a center of a boundary part between the communicating part and the inner periphery of the cylinder,
• the hermetic compressor further comprises an injection check valve configured to open and close the injection vertical hole,
• another end surface of both end surfaces of the cylinder in the height direction has an injection check valve actuation groove in which the injection check valve is disposed, in a plan view, a width of the boundary part between the communicating part and the inner periphery of the cylinder is larger than a width of a boundary part between the communicating part and the injection check valve actuation groove, and in a plan view, the communicating part has a communicating-part wall surface extending along a radial direction, the communicating-part wall surface having an arc shape.