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壓力儀表的測(cè)試方法和原理

時(shí)間:2011/11/11閱讀:947
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本文主要介紹了三種壓力表壓力試驗(yàn)測(cè)定的原理及方法
1,液柱壓力測(cè)量方法:根據(jù)流體靜學(xué)原理,將被測(cè)壓力轉(zhuǎn)換成液柱高度測(cè)量,常用的表U型管壓力表,壓力表一管,斜管壓力計(jì)和活塞式壓力計(jì)等。
2,彈性方法:測(cè)試壓力轉(zhuǎn)換彈性元件變形的位移
補(bǔ)丁:受壓力影響位移,直接驅(qū)動(dòng)傳動(dòng)機(jī)構(gòu)的指示壓力,但更多的是和其他轉(zhuǎn)換部件結(jié)合使用,通過(guò)膈肌和壓力轉(zhuǎn)換成電子信號(hào)。
波紋管位移相對(duì)較大,一般在其頂部安裝傳動(dòng)機(jī)構(gòu),驅(qū)動(dòng)指針直讀,其特點(diǎn)是靈敏度高(尤其是在低級(jí)別的地區(qū)),常用于檢測(cè)低力,但波紋管滯后誤差較大,精度一般只能達(dá)到1.5級(jí)
彈簧管:短接結(jié)構(gòu),使用方便,價(jià)格便宜,測(cè)量范圍寬,因此應(yīng)用非常廣泛
3,電壓力測(cè)量:利用轉(zhuǎn)換元件(如一些機(jī)械和電氣元件)直接測(cè)試壓力轉(zhuǎn)化為電信號(hào)進(jìn)行測(cè)量。
(1),彈性元件配件一些映射裝置,使彈性元件的自由轉(zhuǎn)換成位移的電子信號(hào),如電阻,電感,電容,霍爾芯片,應(yīng)變式,振弦式,等
(2),該彈性元件的壓力迅速組成部分,主要利用某些物體的物理特性和應(yīng)力有關(guān),如壓電,壓阻式壓力,壓磁式,等等。

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