緊急切斷閥執行機構的選型
緊急切斷閥氣(qi)(qi)動執(zhi)行(xing)機構(gou)是(shi)以壓(ya)(ya)縮空氣(qi)(qi)為(wei)動力，實(shi)現對(dui)(dui)閥門的(de)(de)控(kong)(kong)制，具有結構(gou)簡(jian)單、動作(zuo)可(ke)靠、性能穩定(ding)、維修方(fang)便、防火防爆(bao)，并且易于制成較大推力的(de)(de)執(zhi)行(xing)機構(gou)、價格(ge)便宜、檢修維護簡(jian)單，對(dui)(dui)環(huan)境的(de)(de)適應性好等優點。缺(que)點是(shi)實(shi)現控(kong)(kong)制必須敷(fu)設(she)(she)專用(yong)的(de)(de)氣(qi)(qi)源(yuan)管(guan)道，對(dui)(dui)于雙作(zuo)用(yong)的(de)(de)氣(qi)(qi)動執(zhi)行(xing)器,斷氣(qi)(qi)源(yuan)后不(bu)能回到預設(she)(she)位置(zhi),單作(zuo)用(yong)的(de)(de)氣(qi)(qi)動執(zhi)行(xing)器，斷氣(qi)(qi)源(yuan)后可(ke)以依(yi)靠彈簧回到預設(she)(she)位置(zhi)。氣(qi)(qi)動執(zhi)行(xing)機構(gou)按(an)照控(kong)(kong)制氣(qi)(qi)壓(ya)(ya)轉換成位移(yi)的(de)(de)方(fang)式(shi)不(bu)同(tong),可(ke)分為(wei)薄(bo)膜式(shi)、活塞式(shi)和齒(chi)輪齒(chi)條(tiao)式(shi)。
液氨緊急切斷閥-上海永龍閥門廠
氣(qi)動(dong)(dong)(dong)緊急(ji)切斷(duan)閥(fa)執行器是一種(zhong)活塞式執行機構，適用(yong)90°轉角行程的(de)(de)閥(fa)門（如蝶(die)閥(fa)、切斷(duan)閥(fa)、球閥(fa)、旋塞閥(fa)）的(de)(de)開(kai)關切斷(duan)和控制。當(dang)壓縮空氣(qi)進入(ru)氣(qi)缸，推(tui)動(dong)(dong)(dong)活塞作直線運動(dong)(dong)(dong)，利用(yong)活塞銷與撥叉U型(xing)槽將活塞的(de)(de)直線運動(dong)(dong)(dong)轉為(wei)撥叉的(de)(de)旋轉運動(dong)(dong)(dong)，撥叉旋轉帶動(dong)(dong)(dong)輸出軸轉動(dong)(dong)(dong)，從(cong)而實現對氣(qi)動(dong)(dong)(dong)切斷(duan)閥(fa)的(de)(de)控制。
緊急切斷閥執行機構的選型
按(an)照緊(jin)急(ji)切斷閥作(zuo)用類型(xing)的不同，可分為單作(zuo)用氣動執行器和雙作(zuo)用氣動執行器。
單作用活塞(sai)式(shi)氣(qi)動執行器，開(kai)(kai)關動作中(zhong)一個(ge)由氣(qi)源驅(qu)動，另一個(ge)由彈簧(huang)復位；開(kai)(kai)關動作都(dou)是通過(guo)氣(qi)源驅(qu)動完成的，就是雙作用活塞(sai)式(shi)氣(qi)動執行器。
按照結構(gou)的不(bu)同，永龍閥(fa)門切(qie)斷閥(fa)可分(fen)為單作(zuo)用(yong)（常(chang)閉式）氣缸和(he)雙作(zuo)用(yong)氣缸（常(chang)開(kai)式）活塞式，通(tong)常(chang)由(you)扭(niu)矩大小(xiao)決定，雙氣缸提(ti)供的力更(geng)大；
氨氣緊急切斷閥-上海永龍(long)閥門廠(chang)
緊急切斷閥執行器的工作原理
當(dang)壓縮(suo)空(kong)(kong)氣(qi)(qi)從A管咀(ju)進入(ru)液(ye)氨緊急(ji)切(qie)斷閥氣(qi)(qi)動(dong)(dong)(dong)(dong)執行(xing)器時(shi)(shi)，氣(qi)(qi)體推動(dong)(dong)(dong)(dong)雙(shuang)活(huo)塞向(xiang)兩(liang)端(duan)(缸蓋端(duan))直線運動(dong)(dong)(dong)(dong)，活(huo)塞上的齒(chi)條帶動(dong)(dong)(dong)(dong)旋轉(zhuan)軸上的齒(chi)輪逆時(shi)(shi)針方向(xiang)轉(zhuan)動(dong)(dong)(dong)(dong)90度(du)，氣(qi)(qi)動(dong)(dong)(dong)(dong)切(qie)斷閥即被打開。此時(shi)(shi)氣(qi)(qi)動(dong)(dong)(dong)(dong)執行(xing)閥兩(liang)端(duan)的氣(qi)(qi)體隨(sui)B管咀(ju)排出。反之，當(dang)壓縮(suo)空(kong)(kong)氣(qi)(qi)從B官咀(ju)進入(ru)氨氣(qi)(qi)緊急(ji)切(qie)斷閥氣(qi)(qi)動(dong)(dong)(dong)(dong)執行(xing)器的兩(liang)端(duan)時(shi)(shi)，氣(qi)(qi)體推動(dong)(dong)(dong)(dong)雙(shuang)塞向(xiang)中間直線運動(dong)(dong)(dong)(dong)，活(huo)塞上的齒(chi)條帶動(dong)(dong)(dong)(dong)旋轉(zhuan)軸上的齒(chi)輪順時(shi)(shi)針方向(xiang)轉(zhuan)動(dong)(dong)(dong)(dong)90度(du)，氣(qi)(qi)動(dong)(dong)(dong)(dong)切(qie)斷閥即被關閉(bi),此時(shi)(shi)氣(qi)(qi)動(dong)(dong)(dong)(dong)執行(xing)器中間的氣(qi)(qi)體隨(sui)A管咀(ju)排出。
