| Summary: | 碩士 === 大葉大學 === 機械工程研究所碩士班 === 96 === This paper relates to the basic research concerning the design and analysis of duel screw vacuum pumps. These problems include the basic mathematic models, geometric analysis the cross section of the screws, and the efficiency. Cooperate with the computer to calculate, draw the profile of screw rotor and try to get the analysis data. We probe into the geometry characteristic includes the discharge area, the length of sealing line and the area of blow hole that the pump has when set up according to different lead angles under this condition mainly of equal lead. At last, design the profiles of different blow hole area of two group to compare the characteristic of geometry.
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