spraying systems BSPT 1/4G SS 噴嘴
spraying systems BSPT 1/4G SS 噴嘴
噴嘴流量計(jì)的工作原理
噴嘴流量計(jì)屬于節(jié)流式流量計(jì),如圖1所示,主要由節(jié)流裝置和差壓計(jì)組成的流量測量儀表,由三部分組成:
噴嘴流量計(jì)
(1)將被測流體的流量轉(zhuǎn)換成差壓信號(hào)的節(jié)流裝置,包括節(jié)流元件、取壓裝置、前后測量管,節(jié)流元件是在直線管道中,使流束產(chǎn)生收縮的裝置;
(2)傳輸差壓信號(hào)的信號(hào)管路;
(3)測量差壓值的差壓計(jì)或差壓變送器及顯示儀表。
其工作原理是滿管的流體流經(jīng)管道內(nèi)的節(jié)流裝置,流束在節(jié)流元件處收縮,則流速增加,據(jù)能量守恒定律和流動(dòng)連續(xù)性方程,動(dòng)壓能和靜壓能在一定條件下可以互相轉(zhuǎn)換,流速加快的結(jié)果必然要導(dǎo)致靜壓能的降低,因而在節(jié)流元件的前后產(chǎn)生了靜壓力差(或稱差壓)。流體的流速愈大,在節(jié)流元件前后產(chǎn)生的差壓也愈大,所以可通過測量差壓來衡量流體流過節(jié)流裝置時(shí)的流量大小,其原理圖,見圖2。
噴嘴流量計(jì)
2、主蒸汽管道中常見的噴嘴流量計(jì)類型
在電站鍋爐主蒸汽管道中,我們常見到的流量計(jì),以ISA1932噴嘴流量計(jì)和長徑噴嘴流量計(jì)為主。
ISA1932噴嘴流量計(jì)主要由一個(gè)標(biāo)準(zhǔn)噴嘴、兩支取壓管、兩個(gè)環(huán)式短節(jié)對接焊接而成。
長徑噴嘴流量計(jì)主要由一個(gè)長徑噴嘴、定位銷、支承環(huán)、兩支取壓管、測量管道組成。
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