2010•Purdue e-Pubs (Purdue University System)Open access
A Study of a New Oil Injection to Compression Chambers on Scroll Compressors
Kiyoshi Sawai, Akira Hiwata, Atsushi Sakuda, Noboru Iida, Takashi Morimoto, Noriaki Ishii
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Abstract
In scroll compressors, the leakage through the clearance has a large influence on performance.To improve the efficiency of scroll compressor by reducing the leakage, we carried out experiments of the oil injection in compression chambers and examined the compressor performance.As results of experiments, it became clear that the oil flow rates in which compression efficiency became highest were different between R410A scroll compressor used in air-conditioner and CO 2 scroll compressor used in heat pump water heater.Then, we newly designed an intermittent oil supply mechanism to control the oil flow rate to the compression chambers, and we made clear the oil flow characteristics of this mechanism by the theoretical and the experimental study.Using this intermittent oil supply mechanism, the performance of each compressor was improved.In addition, deriving a "leakage index" of the compressor by the dimensional analysis, there was good correlation between "leakage index" and the optimal oil injection rate on scroll compressors.
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