| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 99 === Nowadays, Roots type rotors are widely used in various industrial applications, such as rotary blower, pump, supercharger, and compressor, etc. The aim of this paper is to present a new profile geometric design of Roots type rotors, the compound profile of driving rotor is consisted of three-segment curves formed by cycloid-circular-cycloid and circular-cycloid-circular. Based on theory of gearing and continuous connected condition for compound curves, the profile of new Roots type rotors are derived. In order to avoid yielding during rotors rotation of micro Roots type pump, the contact stress of rotors for two-lobe, three-lobe and four-lobe were simulated separately by using the finite element analyses software ANSYS/Workbench. Otherwise, the pressure head of new Roots type pump of two-lobe, three-lobe and four-lobe were analyzed separately by using the computational fluid dynamics software FLUENT. From the analyses results of area efficiency and pressure head, it reveals that the proposed new Roots type rotors can provides more better pump efficiency than those of traditional Roots rotors. The new micro Roots type rotors were successfully fabricated by LIGA-like process and nickel70-cobalt30 electroforming process for the purpose of achieving the high aspect ratio new micro Roots type rotors.
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