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液壓驅(qū)動(dòng)隔膜計(jì)量泵使用過程中的故障和解決方法
來源： 發(fā)布時(shí)間：2016-09-24 10:57:26 瀏覽次數(shù)：次
由于裝置使用液壓驅(qū)動(dòng)隔膜泵也是新的嘗試，在運(yùn)行期間，尤其是在裝置開車初期，計(jì)量泵也出現(xiàn)過各種不同類型的故障。通過解決這些問題，也逐漸提高了工程技術(shù)人員對(duì)這種泵的性能和結(jié)構(gòu)特點(diǎn)的理解，為其后機(jī)泵長(zhǎng)期穩(wěn)定運(yùn)行奠定了基礎(chǔ)。
1、計(jì)量泵出口壓力流量大幅波動(dòng)
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)。通過變頻電機(jī)與流量計(jì)的配合.實(shí)現(xiàn)流量的自動(dòng)控制。計(jì)量泵運(yùn)行過程中發(fā)現(xiàn)流量出現(xiàn)大幅波動(dòng)的情況.現(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。機(jī)泵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%-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)給工藝和控制帶來不利影響，計(jì)量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(本例中緩沖器內(nèi)填充氮?dú)?。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緩沖管路輸送中液體的脈沖。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)氣體被過度壓縮。在吸入行程時(shí)又無法為回流介質(zhì)提供足夠壓力。緩沖器無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)致了計(jì)量泵出口流量的波動(dòng)?；謴?fù)緩沖器功能后即排除了故障。
2、計(jì)量泵出口無流量故障
計(jì)量泵在使用過程中出現(xiàn)出口流量短時(shí)間內(nèi)大幅降低的情況。故障隨機(jī)出現(xiàn)，在變頻數(shù)值不變的條件下出口流量明顯低于正常值，甚至降到無流量。故障持續(xù)30秒左右后自行恢復(fù)。解決故障的過程中首先懷疑出口管上安全閥起跳泄漏，將安全閥出口加裝盲板后故障依舊。隨后嘗試更換計(jì)量泵出口脈沖緩沖器亦無效果。由于該泵的液壓驅(qū)動(dòng)油由傳動(dòng)機(jī)座內(nèi)的潤(rùn)滑油提供，考慮是否潤(rùn)滑油中的雜質(zhì)堵塞油路。遂對(duì)潤(rùn)滑油進(jìn)行更換，同時(shí)對(duì)傳動(dòng)機(jī)座內(nèi)的潤(rùn)滑油腔進(jìn)行清洗。但潤(rùn)滑油更換兩次后問題依舊。終決定拆泵檢查，經(jīng)拆解機(jī)泵在計(jì)量泵進(jìn)口單向閥中發(fā)現(xiàn)半個(gè)墊圈。確定該異物為導(dǎo)致流量間隙波動(dòng)的原因。其在單向閥中影響單向閥的正常啟閉，導(dǎo)致計(jì)量泵無法正常吸入被輸送介質(zhì)。造成出口流量的異常波動(dòng)。
計(jì)量泵中的異物移除后本應(yīng)將故障排除，但將機(jī)泵重新組裝后卻出現(xiàn)了出口完全沒有流量的故障。經(jīng)多次拆卸檢查均未發(fā)現(xiàn)異常。經(jīng)仔細(xì)查看該泵的圖紙資料，才找出故障原因。這是由于該型計(jì)量泵每次完全拆解后均需要執(zhí)行對(duì)隔膜腔的充油操作。計(jì)量泵：www.www.bjxbb.com
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