A Mathematical Model for Internal Leakage in a Rotary Compressor

The internal leakage has a great effect on the performance of a rotary compressor. In this paper a leakage model as a part of a complete simulation model is developed. The leakage model analyzes the oil/refrigerant mixture leakage flow through the roller radial clearance caused by the motion of roller relative to cylinder wall and the pressure difference and considers the effect of the motion of roller and vane on the leakage from oil sump and the solubility of refrigerant to oil. The variations of the leakage loss and the roller radial clearance with the rotating speed are shown. The influence of the tolerance of roller face clearance on the range of performance of compressors mass-produced is discussed.