具有橢圓擺線之新型爪式轉子外形發展

Abstract

此篇論文發展了一個具有橢圓擺線之新型爪式轉子外形設計。此種爪式轉子之單一爪部外形由一段外擺線、兩段圓弧、一段橢圓擺線及一段與橢圓擺線相對應之曲線所組成。其外形輪廓由三個不同的獨立參數所定義，分別為：節圓半徑、爪數、橢圓長軸。為了減少帶回量，此篇論文亦提出修正型爪尖輪廓使運轉更平順。此外，本篇論文推導新型爪式轉子幾何模型之幾何限制條件以避免不適當之轉子輪廓。並且建立一AUTOLISP輸入對話框讓設計者能夠輸入想要繪製的爪式轉子參數來產生爪式轉子外型。在影響爪式轉子泵浦中，爪式轉子的面積效率扮演很重要的角色。再來，本篇論文將新型爪式轉子之效率與現有之類似爪式轉子比較。此外，此對新型爪式轉子外型具有兩相同外型之爪式轉子，並且每一爪部輪廓皆相同，如此可以降低組裝以及製造的成本。

This thesis develops a novel design for claw rotor profiles with elliptical roulette. The profile of a new claw rotor profile consists of an epitrochoid curve, two arcs, an elliptical roulette, and a conjugate curve corresponding to the elliptical roulette. The rotor profile is defined by three parameters: pitch radius, claw number, major axis of ellipse. The modified claw-shaped is also proposed for reducing the carryover volume in this thesis. In addition, the design constraint is presented for avoiding to generate discontinuous curves. An AUTOLISP interface program is built for designers to provide design parameters and generate claw rotor profiles. The area efficiency of claw rotor profiles play an integral role in pump performance and its performance of claw rotor pumps can be in contrast to previous types of claw rotor pumps. Furthermore, a pair of new type of claw rotor has two identical claw rotor profiles and each claw also has the same profile, which can decrease the cost of assembly.