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研究生:吳琮欽
研究生(外文):Wu, fleet
論文名稱:乾氏真空幫浦轉子線形理論分析
論文名稱(外文):Tooth Profile Analysis of Dry Pump
指導教授:馮展華馮展華引用關係
指導教授(外文):Zhang-Hua Fong
學位類別:碩士
校院名稱:國立中正大學
系所名稱:機械工程學系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:83
中文關鍵詞:氣體回流量間隙
外文關鍵詞:Carry-overgap
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本文主要針對乾式幫浦中之魯式轉子線形進行接觸點軌跡、間隙值
、Carry-Over、進排氣口體積變化分析。根據齒輪原理建立兩轉子運轉之
實際嚙合機構模擬,利用平面共軛原理及常用線形數學模式(包括圓弧、
漸開線、擺線),推導其共軛線形數學模式。並以齒形接觸分析理論為基
礎,來探討實際上留有間隙之兩轉子接觸點軌跡、瞬時的間隙大小及進排
氣口體積變化,最後以市面上之轉子為例,找出其線形參數,進而求得接
觸點軌跡、間隙值、Carry-Over體積、進排氣口體積變化,並以 Autocad
驗證本文之分析模式可行性。以提供熱流研究人士用來研究幫浦洩漏量、
溫度變化及容積效率等。
A mathematical model is proposed to calculate the coordinates of
the rotorprofile and simulate the meshing process of the dry
vacuum pump. Four basic curves, circular-arc, conjugate curve
to the circular-arc, extendedinvolute curve, and extended
cycloid curve, commonly used by the industry are included in
the proposed mathematical model . According to theory of
gearing , we can establish the meshing mechanism simulation of
two rotors and find the mathematical model of conjugate curves
of basic curves by using theory of conjugate. Since rotors of
the vacuum pump are synchronized by the timing gears
attached to the end of the rotating shafts , the meshing
rotors do not contact each other at any moment . Therefore
, the conventional tooth contact analysis technique is not
suitable for simulating the meshing process.A numerical
algorithm is developed to calculates the profile coordinates,
the contact points , the gap distance variation , the volume
variation of the carry-over, and volume enclosed between the
rotors and the chamber of the housing. A modified tooth contact
analysis which permit small gaps between the meshing rotors is
proposed to calculate the quasi-contact line. A reverse
engineering process for the rotor profile is also proposed to
study the existing design. Finally the drawing software Autocad
could be applied to verify the accuracy of the proposed
mathematical model and the numerical algorithm values will
help us to analyse the characteristic of the dry vacuum
pump. The results of the thesis can be applied to develop new
dry vacuum pump.
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