Recently, residential air conditioner power consumption reduction has been increasingly required in terms of global warming prevention. In Japan, the energy saving guideline index for air conditioners has been changed from the coefficient of performance (COP) measured during rated operation to the annual performance factor (APF), closer to the actual usage condition.We have made improvements, with APF efficiency enhanced by 6% compared with our conventional 2-cylinder rotary compressor. This paper explains development details of the highly efficient 2-cylinder rotary compressor. To improve efficiency, we optimized the ratio of the cylinder height H to the cylinder bore diameter ΦD (H/ΦD), and reduced the leakage loss from the compression chamber to the suction chamber. Additionally, we adopted a suction piping structure whereby a suction pipe is connected to the thick partition plate splitting the suction gas flow with Y-shaped respectively to the upper cylinder and to the lower cylinder (Y-shaped suction flow split structure). To retain reliability, we designed the high rigidity crankshaft, and were able to reduce friction loss.
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