OPTIMUM ROTOR GEOMETRICAL PARAMETERS IN REFRIGERATION HELICAL TWIN SCREW COMPRESSORS

摘要

This paper presents a parameter study for optimum rotor geometrical parameter combinations of a refrigeration helical twin screw compressor with four commonly used lobe combinations and five different length/diameter ratios and wrap angles. The volumetric and indicated efficiencies of the compressor are important. So also are other factors such as rotor deflection, bearing load, bearing life and inter-rotor contact force; any one of which could become a decisive parameter depending on the circumstances. In this paper the influence of rotor geometrical parameters is discussed with respect to all these factors and suggestions on choosing optimum parameter combinations are presented.