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產(chan)品(pin)展(zhan)示
PRODUCT DISPLAY
止回(hui)閥的結構設(she)計
發(fa)布(bu)日期(qi)：2012-11-09 瀏(liu)覽(lan)次數：5475
hbzhan內(nei)容(rong)導讀(du)：采用標定(ding)過(guo)的壓力(li)表,由(you)差(cha)壓變(bian)送器(qi)將壓力(li)信(xin)號(hao)送示波(bo)器(qi)進(jin)行記錄,以(yi)標定(ding)好的比(bi)例(li)R在(zai)示波(bo)圖(tu)上(shang)讀取每壹(yi)時(shi)刻(ke)的水(shui)錘壓力(li)變(bian)化值(zhi).所示為(wei)普(pu)通(tong)結構止(zhi)回(hui)閥與(yu)普通(tong)結構止(zhi)回(hui)閥帶(dai)緩閉(bi)副閥的試(shi)驗結果對(dui)比(bi).
止(zhi)回(hui)閥作(zuo)為(wei)管道(dao)系(xi)統(tong)順流(liu)時(shi)開啟,逆(ni)流(liu)時(shi)關(guan)閉(bi)的閥門,主要(yao)用(yong)於(yu)防(fang)止(zhi)介質(zhi)倒(dao)流(liu),防(fang)止(zhi)泵(beng)及驅動電機反轉(zhuan)以(yi)及容(rong)器內(nei)介質(zhi)泄(xie)放(fang).目前(qian)使(shi)用(yong)zui普遍(bian)的是(shi)閥瓣(ban)圍(wei)繞(rao)閥體(ti)銷軸(zhou)旋(xuan)轉(zhuan)的旋(xuan)啟(qi)式(shi)止回(hui)閥和閥瓣(ban)沿著(zhe)閥體(ti)垂(chui)直(zhi)中(zhong)心線(xian)移動的升降(jiang)式(shi)止回(hui)閥,但(dan)以(yi)上(shang)2種(zhong)結構的閥門均存(cun)在(zai)關(guan)閉(bi)時(shi)介質(zhi)倒(dao)流(liu)速度從(cong)zui大(da)迅速(su)降(jiang)為(wei)零(ling),致(zhi)使(shi)管道(dao)進(jin)水(shui)管壹(yi)側內(nei)壓迅速(su)升高(gao),從(cong)而產(chan)生(sheng)對管路系統(tong)有破壞(huai)作(zuo)用(yong)的水(shui)錘現象,所以(yi)壹(yi)般止(zhi)回(hui)閥生(sheng)產(chan)口(kou)徑(jing)為(wei)50～500mm.為(wei)減(jian)小(xiao)止(zhi)回(hui)閥的水(shui)錘效(xiao)應(ying),擴大(da)止(zhi)回(hui)閥的使(shi)用(yong)範圍(wei),作者設計在(zai)原(yuan)產(chan)品(pin)基礎(chu)上(shang),增設緩閉(bi)副閥,解(jie)決了(le)管道(dao)水(shui)錘升壓問(wen)題.
1、升降(jiang)式(shi)止回(hui)閥結構改進(jin)
升降(jiang)式(shi)止回(hui)閥又(you)名底(di)閥,它(ta)可以(yi)保持(chi)停(ting)泵(beng)時(shi)抽(chou)吸所需水柱(zhu)；該閥結構改進(jin)的特點(dian)是在(zai)主(zhu)閥閥瓣(ban)與閥體(ti)支架間增設壹(yi)緩閉(bi)副閥。
閥體(ti)與底(di)網(wang)間增設壹(yi)墊環(huan),以(yi)增補閥瓣(ban)上(shang)升的高(gao)度；緩(huan)沖(chong)活塞與緩(huan)沖(chong)缸采用橡膠密(mi)封,閥瓣(ban)軸與(yu)活(huo)塞剛性(xing)聯(lian)接(jie),緩(huan)沖(chong)缸與(yu)閥瓣(ban)軸之間間隙(xi)較(jiao)小(xiao).當(dang)介質(zhi)順流(liu)時(shi),壓力(li)介質(zhi)推開閥瓣(ban)進(jin)入(ru)主(zhu)閥體(ti)腔,同時(shi)推動緩沖(chong)活塞上(shang)移；當介質(zhi)倒(dao)流(liu)時(shi),由(you)於緩沖(chong)缸內(nei)部(bu)開啟時(shi)已(yi)充滿介質(zhi),而緩(huan)沖(chong)缸與(yu)閥瓣(ban)軸之間間隙(xi)較(jiao)小(xiao),因(yin)此(ci)隨緩沖(chong)缸內(nei)介質(zhi)通(tong)過(guo)間隙(xi)逐(zhu)漸(jian)排出(chu),主閥閥瓣(ban)關(guan)閉(bi)起(qi)到緩(huan)沖(chong)作用,使(shi)管網(wang)內(nei)水錘升壓得以(yi)控(kong)制(zhi)。
2、止回(hui)閥緩(huan)閉(bi)結構改進(jin)前(qian)後的試(shi)驗結果
采用標定(ding)過(guo)的壓力(li)表,由(you)差(cha)壓變(bian)送器(qi)將壓力(li)信(xin)號(hao)送示波(bo)器(qi)進(jin)行記錄,以(yi)標定(ding)好的比(bi)例(li)R在(zai)示波(bo)圖(tu)上(shang)讀取每壹(yi)時(shi)刻(ke)的水(shui)錘壓力(li)變(bian)化值(zhi).所示為(wei)普(pu)通(tong)結構止(zhi)回(hui)閥與(yu)普通(tong)結構止(zhi)回(hui)閥帶(dai)緩閉(bi)副閥的試(shi)驗結果對(dui)比(bi).
試(shi)驗閥門通(tong)徑(jing)為(wei)100mm,系(xi)統(tong)壓力(li)0.5MPa,流(liu)量(liang)5L/s.當(dang)泵(beng)突然停(ting)止(zhi),表明動力(li)切(qie)斷(duan)後止(zhi)回(hui)閥進(jin)水(shui)口側壓力(li)-時(shi)間曲線(xian)為(wei)主(zhu)閥不(bu)帶(dai)緩閉(bi)副閥時(shi)的結果,zui大(da)水(shui)錘升壓0.53MPa；為(wei)主(zhu)閥帶(dai)緩閉(bi)副閥時(shi)的結果,zui大(da)水(shui)錘升壓0.04MPa。
3、結論
（1）主(zhu)閥閥瓣(ban)啟閉(bi)平穩(wen),緩閉(bi)副閥結構緊(jin)湊,性能可(ke)靠(kao)。
（2）主(zhu)閥閥瓣(ban)先速關(guan)後緩(huan)閉(bi),可有(you)效防(fang)止(zhi)破(po)壞(huai)性(xing)水錘,擴大(da)止(zhi)回(hui)閥的使(shi)用(yong)範圍(wei)。
（3）改進(jin)結構簡(jian)單(dan),便(bian)於(yu)生(sheng)產(chan)和互(hu)換(huan).
（4）緩閉(bi)副閥可(ke)檢(jian)修或(huo)更(geng)換,無礙(ai)止(zhi)回(hui)閥使(shi)用(yong).
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86-021-59740053
