A Study on High Mechanical Efficiency of a Scroll Compressor with Fixed Cylinder Diameter

This paper presents the optimum combination of major parameters for high mechanical efficiency of a compact scroll compressor with a fixed cylinder diameter. The mechanical efficiency was calculated for a number of cylinder volumes, where the cylinder diameter and the scroll thickness were fixed at a constant value of 75.7 mm and 4 mm, respectively, and combinations of the involute base circle radius, the scroll depth and the number of scroll turns were varied. The calculated results indicate that there is a definite optimum combination of major parameters, and with decreasing cylinder volume, selection of the optimum combination becomes more significant for higher mechanical efficiency. In addition, the physical basis of the optimum combination of major parameters was examined by showing the characteristics of the frictional power loss at each pair.