| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 104 === Thesis Topic: Parametric Design and Performance Evaluation of Tooth Profile of A New Type Roots Vacuum Pump Rotor . In Roots rotors linear studies, cycloids, involutes, and arcs are the main geometric lines that constitute Roots rotors, and are applicable to Roots vacuum pumps, Roots blowers, Roots compressors etc. This study implements the Mathematica software as a tool for numerical calculations and establishing mathematical models to develop a new type of Roots rotor, and according to the gear mesh theory, its design is completely mesh conjugate and does not have problems such as tooth undercutting or carry over. This study also proposes a new type of performance index to serve as a foundation for comparing different rotor tooth profiles, known as the Sealing Performance Index. It is comprised of the sealing factor between tooth, the sealing factor above tooth, comparison of Roots rotor cycloids (RC tooth profile), Roots rotor arc-involute curves (RE tooth profile), as well as Roots rotor cycloids (TR tooth profile) and Roots rotor reversed engineering (RE tooth profile) with variable cycloid ratios. It evaluates the capability of the new type Roots rotor in achieving higher sealing performance under the same pitch diameter, center distance and area factors. Through industry-academic cooperation, the new type Roots rotor is applied in vacuum pumps to test whether its improved sealing performance is capable of effectively reducing compressor power consumptions.
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