Optimization of a rotary compressor with an enveloped stator inner contour and a single two-pin sliding-vane

The optimization of a rotary compressor with a stator inner enveloped contour and a sliding vane was studied. The envelope on the cover plate for bearings mounted on two pins of the vane and the stator inner enveloped contour were designed. The vane tips move along the stator inner enveloped contour when the vane rotated. The mathematical models for the geometric, the enveloped on the cover plate and stator inner contour, thermal and dynamic analyses were generated. The genetic algorithm was utilized with the objective function of the total efficiency, and the penalty value was determined with the fastest convergence to achieve the optimum compressor design. The compressor was fabricated and the air pressure and temperature at the end of intake process and compression process were measured. With the rotor rotational speed of 180 rad/s, the calculated and measured air pressures at the end of the intake process were 0.093 MPa and 0.096 MPa, respectively. The calculated and the measured air pressures at the end of the compression process were 0.176MPa and 0.171MPa, respectively. The calculated and measured compression ratios were 1.88 and 1.78, respectively. The calculated and measured air temperatures at the end of the intake process were 311.3oK and 305.1oK, respectively. The calculated and the measured air temperatures at the end of the compression process were 349.8oK and 338.2oK, respectively. With the specific volume flow rate same as that of an existing compressor, the measured mechanical efficiencies of the current compressor and the existing compressor were 71.2% and 68.4%, when the rotor rotational speed was 140 rad/s. The mechanical efficiency was 2.8% higher than that of the existing compressor.