Development of a Hermetic Rotary Carbon Dioxide Compressor

摘要

Cooling systems using natural refrigerants are receiving more and more attention worldwide. Carbon dioxide (R 744) has reappeared, as it is nontoxic, nonflammable, and widely available as a byproduct of industrial processes. However, carbon dioxide (CO{sub}2) systems operate at much higher pressures than systems using HCFC, HFC, or HFC-blend refrigerants. Therefore, there is a need to develop compressors that operate efficiently and reliably at these higher pressures. A two-stage hermetic rolling piston compressor was developed for these applications. The compressor has dimensions such as 207.8 mm outer diameter, 445.8 mm tall, and displacement of 21.8 cc. In the first stage, the suction gas is compressed to a pressure between 7 - 8 MPa, and in the second stage, the gas is compressed to a pressure between 11 - 12 MPa. The housing, bearings, and crankshaft designs were some of the critical items in developing the compressor.