Development Of 2-Cylinder Rotary Compressor Series For Light Commercial Use With R410A

We have developed a DC 2-cylinder rotary compressor series for light commercial air conditioners using a new refrigerant R410A (HFC) for the first time in the industry. Since it is possible to realize a higher efficiency of an air conditioner system, the new refrigerant R410A has been chosen from a standpoint of global warming prevention. On the other hand, the load to the compression elements increases because the operating pressure of R410A is about 1.6 times as high as that of R22. By adopting the 2-cylinder rotary mechanism and optimizing mechanical parts dimension, the dynamic characteristics of the bearings could be made equivalent to the conventional compressor, and we were able to secure high quality. Moreover, this compressor series achieves 20% higher efficiency over wide speed operation range and 33 to 50% less weight than conventional compressors by the 2-cylinder rotary mechanism and a new DC motor, which consists of a rotor with a rare-earth permanent magnet and a concentrated winding type stator.