Experimental performance evaluation on leakage characteristics of R32 in rolling piston type rotary compressor

The rolling piston compressor has occupied the compressor market for room air conditioners for years. Compressor efficiency is directly related to the energy efficiency ratio of room air conditioners. As an important replacement of HCFCs, R32 is widely used in the field of refrigeration and air-condition. In this paper, the mass flow rate of refrigerant-lubricant oil mixture in R32 compressor is measured both experimentally and theoretically. In the experiment, influences of minimal clearance, length, geometry of radial leakage channel and minimal clearance of piston face leakage channel on leakage mass flow rate of refrigerant-lubricant mixture, pure lubrication and refrigerant have been investigated in this study. Leakage characteristics and volumetric efficiency of R32 and R410A are respectively compared. Calculation results of the theoretical formulas and the semi-empirical formulas are compared with the experimental results and the semi-empirical formulas have satisfactory reliability and practicality.