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巴特分析造成計(jì)量泵出口壓力流量大幅波動(dòng)原因
來(lái)源： 發(fā)布時(shí)間：2016-11-18 14:13:18 瀏覽次數(shù)：次
某裝置使用隔膜式計(jì)量泵時(shí)為采用變頻電機(jī)驅(qū)動(dòng)，并在計(jì)量泵出口配備質(zhì)量流量計(jì)。通過(guò)變頻電機(jī)與流且計(jì)的配合，實(shí)現(xiàn)流量的自動(dòng)控制。計(jì)量泵運(yùn)行過(guò)程中發(fā)現(xiàn)流出現(xiàn)大幅波動(dòng)的情況?，F(xiàn)場(chǎng)檢查發(fā)現(xiàn)計(jì)量泵現(xiàn)場(chǎng)壓力表顯示的計(jì)量泵出口壓力也存在大幅波動(dòng)的情況。在排除控制系統(tǒng)原因后，對(duì)機(jī)泵進(jìn)行了拆解檢查，未發(fā)現(xiàn)異常。得以重新安裝后故障依舊。后檢查發(fā)現(xiàn)計(jì)量泵出口的脈沖緩沖器設(shè)定壓力明顯低于正常值，經(jīng)重新加壓至使用壓力的50%一60%之間后故障解決。
由于為隔膜計(jì)量泵的機(jī)構(gòu)為往復(fù)泵，其運(yùn)行過(guò)程中存在排出行程和吸入行程。排出行程中進(jìn)口閥關(guān)閉，被輸送介質(zhì)在膜片的作用下受壓被推出出口閥，計(jì)量泵出口壓力達(dá)到高值。但在吸入行程中則進(jìn)口閥開(kāi)啟從進(jìn)口管吸入被輸送介質(zhì)，此時(shí)出口閥關(guān)閉使得計(jì)量泵出口壓力達(dá)到低值。為避免這樣的壓力、流量波動(dòng)給工藝和控制帶來(lái)不利影響，計(jì)泵大多配有脈沖緩沖器。脈沖緩沖器實(shí)質(zhì)上是一個(gè)儲(chǔ)存惰性氣體的腔室。在一定封閉空間內(nèi)液體是不可壓縮的，氣體卻可以。脈沖緩沖器正是應(yīng)用了氣體的可壓縮性來(lái)緩沖管路輸送中液體的脈汁。減小被輸送介質(zhì)的壓力、流量波動(dòng)。在排出行程中計(jì)量泵的出口壓力升高，被輸送介質(zhì)壓縮脈沖緩沖器內(nèi)的氮?dú)獠⑦M(jìn)入脈沖緩沖器內(nèi)避免出口壓力過(guò)高。在吸入行程中計(jì)量泵的出口壓力下降，當(dāng)其壓力低于氮?dú)鈮毫r(shí)，氮?dú)馀蛎洸⑵仁菇橘|(zhì)流回管路。使得出口壓力保持在一定得水平。有關(guān)研究表明，合適的脈沖緩沖器可以減小系統(tǒng)90%或者更多的脈沖。
在緩沖器內(nèi)的氮?dú)鈮毫Σ蛔愕那闆r下，在計(jì)量泵排出行程時(shí)緩沖器內(nèi)氣體被過(guò)度壓縮，在吸入行程時(shí)又無(wú)法為回流介質(zhì)提供足夠壓力。緩沖器無(wú)法起到正常的緩沖作用，導(dǎo)致了壓力的大幅波動(dòng)，進(jìn)而導(dǎo)致了訓(xùn)量泵出口流且的波動(dòng)?；謴?fù)緩沖器功能后即排除了故障。計(jì)量泵：www.www.bjxbb.com
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