Abstract
Rotary compressor has been widely used in home air conditioning. The sealing forms of roller-vane and roller-cylinder in rotary compressor are linear sealing, resulting in large leakage and low volumetric efficiency. The performance of the compressor tempestuously reduces with the running frequency decreasing. A novel positive displacement compressor was introduced in this paper: rotary cylinder compressor. The cylinder and shaft rotate around their own axes, and the piston reciprocates relative to them, in order to implement suction and exhaust process. Further, the volume efficiency and mechanical efficiency of rotary cylinder compressor and rotary compressor was analyzed and compared theoretically. The results indicated that the sealing forms of all leaking channels in rotary cylinder compressor are face sealing, which results in less leakage and higher volumetric efficiency than linear sealing. The novel compressor has a significant advantage at the medium and low frequency, and the advantage shows more obvious with the decreasing frequency. Finally, the experimental results of the prototype fully verified the performance advantages of rotary cylinder compressor at volumetric efficiency and electrical efficiency, which was consistent with the theoretical analysis.
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