long tri 中文意思是什麼
long tri
解釋
龍池-
By 2010, set up two technical development centers for mass assembly vehicle of national level of the dongfeng commercial vehicles and peugeot cars ; 2 - 3 parts and components technical development centers of national level of the dongfeng motor co., ltd, tri - ring group and etc. ; 20 parts and components technical development centers of provincial level of dongfeng industrial co., ltd, tongda company, xiangyang automobile bearing co., ltd, jiu long group, hubei aviation life - support technology co., ltd and etc
到2010年，初步建成東風商用車、神龍轎車兩個具有國際競爭力的國家級整車技術開發中心，東風汽車有限公司、三環集團等2 - 3個國家級零部件技術開發中心和東風實業公司、通達公司、襄軸公司、九龍集團、中航救生科技公司等20個省級零部件技術開發中心。 -
The paper analyzed the struture of the tri - eccentric butterfly vavle at length, defined the tri - eccentric butterfly valve, educed the geometry function and its characteristic about the section of the butterfly disc. the results indicate : the parallel contour line across butterfly disc thickness is normal ellipse, thereby eslablished function relations between its geometry parameters ( long axis and short axis ) of three primary sections of the butterfly disc and the tri - eccentricity ; in order to avoid interference between the butterfly disc and the valve seat as well as the valve body, combining the torque, we obtained the feasible range about the rotation center of the tri - eccentric butterfly vavle
本文主要分析了三偏心蝶閥的結構，給出了三偏心的定義，推導出了蝶板截面的幾何方程及其性質，結果表明，沿蝶板厚度的平行截面輪廓線為標準的橢圓形，進而推導出了蝶板幾個主要截面的幾何參數（長軸、短軸）與三個偏心之間的函數關系；考慮到蝶板啟閉過程中避免與閥體及閥座發生干涉，結合蝶板的啟閉扭矩，確立了三偏心蝶閥回轉中心的適宜區域。
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