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鄭州巴特熔體泵的穩(wěn)壓穩(wěn)流工作原理
來源：巴特計量泵、齒輪泵公司 發(fā)布時間：2013-11-06 10:01:56 瀏覽次數(shù)：次
熔體泵的輸送性能，來源于它特有的輸送機(jī)理。如圖2所示，這種熔體泵的基本結(jié)構(gòu)是一種外嚙合式齒輪泵[5]。即兩個模數(shù)、齒數(shù)、齒寬均相同的嚙合狀齒輪，在一個與它們的外徑和端面精密配合的泵體內(nèi)旋轉(zhuǎn)，轉(zhuǎn)向如箭頭所示。在齒輪嚙合區(qū)靠泵的入口（進(jìn)料區(qū)）一側(cè)，兩齒輪的齒與槽處于連續(xù)分離、脫開的狀態(tài)。此時，由擠出機(jī)以較低的壓力，將樹脂熔體送入進(jìn)料區(qū)而充滿齒槽。隨著齒輪的旋轉(zhuǎn)，齒槽內(nèi)的熔體不斷移向泵的出口（排料區(qū)）。在齒輪嚙合區(qū)靠泵的出口一側(cè)，兩齒輪的齒與槽進(jìn)入閉合或咬合的狀態(tài)，各齒槽內(nèi)的熔體被強(qiáng)迫擠出。這樣周而復(fù)始地進(jìn)行，實現(xiàn)對熔體的連續(xù)排送。顯然，這種機(jī)械位移式的輸送機(jī)理與單螺桿依靠固體摩擦和粘性拖曳作用的輸送機(jī)理有著質(zhì)的區(qū)別。泵的實際流量和流量穩(wěn)定性與齒輪結(jié)構(gòu)參數(shù)、泵的轉(zhuǎn)速及熔體粘度等因素有關(guān)。
圖2 熔體泵工作原理簡圖 Fig.2 Workingprinciplediagramofmeltpump
熔體泵工作時,當(dāng)泵的出口出現(xiàn)諸如濾網(wǎng)、濾板或某一成型模具產(chǎn)生的阻力時,泵中的齒輪就像一個缸桶內(nèi)的活塞,對排料區(qū)的熔體實施擠壓作用,以實現(xiàn)泵的增壓功能。同時,泵中的齒輪又相當(dāng)于一個轉(zhuǎn)動著的屏障,可以有效地阻隔進(jìn)料區(qū)的壓力波動和流量波動對排料區(qū)的影響。當(dāng)泵的入口壓力因各種因素的波動而在一個很大的范圍內(nèi)變化時,泵的出口壓力波動完全可以被控制在極小的變動范圍。實驗證明,這種泵有較好的衰減壓力或過濾壓力的作用。由于這種泵特有的輸送機(jī)理及壓力隔離作用,在泵的排料區(qū),影響其壓力與流量波動的因素被顯著減少且易于控制,從而使熔體泵輸出的流量穩(wěn)定、精準(zhǔn)。
鄭州巴特熔體泵有限公司
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