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- 巴特詳細(xì)剖析隔膜式計(jì)量泵常見(jiàn)故障
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計(jì)量泵廠家介紹液壓隔膜計(jì)量泵結(jié)構(gòu)與工作原理
來(lái)源： 發(fā)布時(shí)間：2016-11-09 15:30:28 瀏覽次數(shù)：次
液壓隔膜計(jì)量泵由液力端、傳動(dòng)調(diào)節(jié)機(jī)構(gòu)和電動(dòng)機(jī)三部分組成(見(jiàn)圖1)。傳動(dòng)調(diào)節(jié)機(jī)構(gòu)是由蝸輪蝸桿減速，通過(guò)曲柄連桿機(jī)構(gòu)將電機(jī)的旋轉(zhuǎn)運(yùn)動(dòng)轉(zhuǎn)換成往復(fù)運(yùn)動(dòng)，柱塞行程長(zhǎng)度的調(diào)節(jié)是通過(guò)旋轉(zhuǎn)手輪，使絲桿帶動(dòng)N形軸產(chǎn)生軸向位移，從而改變曲柄的旋轉(zhuǎn)半徑來(lái)實(shí)現(xiàn)的，并由調(diào)量表指示。隔膜計(jì)量泵的傳動(dòng)調(diào)節(jié)機(jī)構(gòu)，通常與往塞計(jì)量泵的傳動(dòng)調(diào)節(jié)機(jī)構(gòu)通用。隔膜計(jì)量泵的液力端是由柱塞的往復(fù)運(yùn)動(dòng)，通過(guò)液壓油驅(qū)動(dòng)隔膜來(lái)完成吸排介質(zhì)。
液壓隔膜計(jì)量泵工作原理
液壓式隔膜計(jì)量泵的液力端比較復(fù)雜，見(jiàn)圖2，它包括由液缸體、柱塞、填料密封、三閥(即補(bǔ)償閥、放氣閥、安全閥)組成的液壓腔，由缸蓋、進(jìn)出口閥構(gòu)成的介質(zhì)腔和隔膜三部分。隔膜設(shè)置在中間，隔開(kāi)液壓腔中的液壓油和介質(zhì)腔中的被輸送介質(zhì)，形成了以隔膜為主體的壓力平衡系統(tǒng)。
隔膜計(jì)量泵工作原理就是將柱塞的往復(fù)運(yùn)動(dòng)轉(zhuǎn)換成隔膜的凹凸撓曲變形的交遞運(yùn)動(dòng)，促使介質(zhì)腔內(nèi)的壓力產(chǎn)生變化，實(shí)現(xiàn)介質(zhì)的吸入和排出。在此工作過(guò)程中，隔膜只能在兩曲面限制板組成的膜腔內(nèi)起到壓力平衡和隔離液壓油的作用，隔膜自身不能運(yùn)動(dòng)。當(dāng)往塞在吸入行程時(shí)，液壓油隨著柱塞的向后運(yùn)動(dòng)而填補(bǔ)了柱塞的空間，液壓腔內(nèi)趨于負(fù)壓，此時(shí)隔膜隨液壓油的運(yùn)動(dòng)向液壓腔方向靠攏，以至后緊貼在后限制板上，隔膜就變成了凹曲面，使得介質(zhì)腔內(nèi)產(chǎn)生了真空，吸入球閥自動(dòng)開(kāi)啟，介質(zhì)隨著壓差自動(dòng)進(jìn)人介質(zhì)腔。當(dāng)柱塞轉(zhuǎn)入排出行程時(shí)柱塞由后死點(diǎn)向前死點(diǎn)運(yùn)動(dòng)，液壓腔的壓力隨著上升。由于介質(zhì)腔的壓力低，此時(shí)，隔膜向介質(zhì)腔靠攏。介質(zhì)腔內(nèi)的壓力也隨之上升，介質(zhì)在壓力下沖開(kāi)排出閥，進(jìn)入輸出管路，直至隔膜貼在前限制板為止。這一排出行程，隔膜由凹曲面變成了凸曲面。液壓式隔膜液力端就是如此反復(fù)交遞地運(yùn)行，連續(xù)不斷地輸送介質(zhì)。巴特計(jì)量泵：www.www.bjxbb.com
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