YXC-150磁助電接點壓力表有三根(gen)接(jie)線(xian),一根(gen)是公(gong)用的,表(biao)(biao)針(zhen)是可調的,可將一個表(biao)(biao)針(zhen)調到0.4M,接(jie)低(di)壓啟動控制(zhi)繼電(dian)器,另一個表(biao)(biao)針(zhen)調到0.6M,接(jie)高(gao)(gao)壓停止繼電(dian)器,公(gong)用線(xian)是高(gao)(gao)低(di)壓控制(zhi)的公(gong)用線(xian)。
如圖所示:
上面的指針是上限,下面的指針是下限,中間的黑色指針指示是實際壓力的數值。實際壓力在上限之上時,與上限接通,與下限斷開。實際壓力在上下限之間時,公共端與上限,下限都斷開。實際壓力在下限之下時,公共端與下限接通,與上限斷開,電接點壓力表就是控制上下限壓力用的。光有電接點壓力表是不(bu)夠的(de)(de),還(huan)要(yao)有控(kong)(kong)制泵的(de)(de)自動控(kong)(kong)制箱。增加個(ge)中(zhong)(zhong)間繼(ji)電(dian)器(qi),電(dian)接點(dian)(dian)(dian)壓力表(biao)上有1個(ge)高(gao)壓點(dian)(dian)(dian),一(yi)個(ge)中(zhong)(zhong)點(dian)(dian)(dian),一(yi)個(ge)低壓點(dian)(dian)(dian),電(dian)流方向:火(huo)線(xian)進中(zhong)(zhong)點(dian)(dian)(dian),經(jing)過低壓點(dian)(dian)(dian),到(dao)中(zhong)(zhong)間繼(ji)電(dian)器(qi)1組(zu)觸(chu)點(dian)(dian)(dian)的(de)(de)常閉點(dian)(dian)(dian),到(dao)接觸(chu)器(qi)線(xian)圈(quan)一(yi)端(duan),繼(ji)電(dian)器(qi)線(xian)圈(quan)另(ling)(ling)一(yi)端(duan)接零(ling)線(xian)。另(ling)(ling)選一(yi)組(zu)接觸(chu)器(qi)上的(de)(de)常開觸(chu)點(dian)(dian)(dian),2端(duan)并(bing)聯到(dao)壓力表(biao)低壓端(duan)與中(zhong)(zhong)點(dian)(dian)(dian)端(duan)。中(zhong)(zhong)間繼(ji)電(dian)器(qi)的(de)(de)控(kong)(kong)制由火(huo)線(xian)進壓力表(biao)中(zhong)(zhong)點(dian)(dian)(dian),到(dao)高(gao)壓點(dian)(dian)(dian)到(dao)中(zhong)(zhong)間繼(ji)電(dian)器(qi)線(xian)圈(quan)一(yi)段(duan)(duan),中(zhong)(zhong)間繼(ji)電(dian)器(qi)線(xian)圈(quan)另(ling)(ling)一(yi)段(duan)(duan)接零(ling)線(xian)。
測量對銅和鋼及其合金不起腐蝕作用的液體、氣體或蒸汽的壓力或負壓,并在壓力到達預定值時,發出信號或接通控制電路。環境震動較大時,可選用磁助式電接點壓力表。
磁助式電接點壓力表工作原理:
以(yi)控(kong)制壓縮機(ji)電機(ji)為例:儲氣(qi)灌(guan)壓力到達下限(xian)自動開啟,到達上限(xian)自動停機(ji)。
控制過程如下:
在(zai)壓力到(dao)達(或開(kai)機(ji)時(shi)低與)下*,電(dian)接(jie)(jie)點壓力表的活(huo)動觸點(電(dian)源(yuan)共公端)與下限觸頭接(jie)(jie)通,繼電(dian)器J1動作并自(zi)鎖,
其常(chang)開(kai)觸(chu)頭閉合驅動(dong)J3,電動(dong)機(ji)得電運轉。當壓力到達上*,活動(dong)觸(chu)點與上限(xian)觸(chu)頭接通,繼電器J2動(dong)作(zuo),其常(chang)閉觸(chu)頭斷開(kai),切斷J1供電,其常(chang)開(kai)點斷開(kai),J3釋放,電機(ji)停轉。如此往(wang)復,達到自動(dong)控制的目(mu)的。
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