| Summary: | 碩士 === 大葉大學 === 自動化工程研究所 === 90 === This paper relates to the problematic concerning the design, analysis and manufacturing of screw vacuum pumps. These problems include the basic geometric, characteristic analysis, spatial curve in 3D space, conditions of nonundercutting and profile of tools. In the section of basic geometric design, adapting the theory of coordinate transformation and the theory of conjure surface and meshing equation. The helical surface of the screw rotor is obtained. Character analysis is divided into two parts－geometric characteristic and performance analysis. Geometric characteristic include the air chamber volume and discharge area, the length of the sealing. The most air chamber volume exists at . The most discharge area exists at , is ending of venting. The length of the sealing has the most volume at 1440. The performance analysis adapt the ideal gas equation to derive relation of the close space and the rpm of the screw rotor. Expect the closed space, it has 5 , the pressure is 101kpa, the temperature is 300k the mass is 5.8841kg. Spatial curve in 3D space use the first base equation and the second base equation to derive principal directions and curvatures equation. The gear theory is applied to focus on the grinding design of the screw rotor.
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