Rotary compressor for rapid freezing appliances

A rotary compressor for rapid freezing appliances, the rotary compressor can be used to charge a refrigerant selected from one of either R1270 or R290, the rotary compressor comprising:

• a pump comprising a first longitudinal axis, the pump comprising:
• an upper support comprising a discharge outlet, the discharge outlet comprising a depth less than 2 millimeters and an effective area between 28 square millimeters and 51 square millimeters, wherein the discharge outlet is used to discharge the refrigerant;
• a cylinder attached to the upper support, the cylinder comprising a suction port, and the suction port being used to draw in the refrigerant;
• and
• a lower support disposed on a side away from the upper support, and the upper support, the cylinder and the lower support collectively constituting a chamber;
• a ring comprising a second longitudinal axis parallel to and spaced from the first longitudinal axis, and the ring being disposed within the pump, wherein the ring comprises a height-to-radius ratio between 1.4 and 1.7;
• a shaft penetrating along the first longitudinal axis and contacting the ring, the shaft being capable of rotating relative to the first longitudinal axis to enable the ring to rotate relative to the pump;
• and
• a vane extending from an outer side of the pump into the chamber, and the vane being capable of contacting an outer side of the ring,
• wherein the shaft further comprises a cam disposed within the chamber, the cam contacts an inner side of the ring, and the cam comprises a height not greater than 24 mm.