意大利ATOS齒輪泵PFG-211-D-R0

齒輪泵的概念是很簡單的，即它的Z基本形式就是兩個尺寸相同的齒輪在一個緊密配合的殼體內(nèi)相互嚙合旋轉(zhuǎn)，這個殼體的內(nèi)部類似“8”字形，兩個齒輪裝在里面，齒輪的外徑及兩側(cè)與殼體緊密配合。來自于擠出機(jī)的物料在吸入口進(jìn)入兩個齒輪中間，并充滿這一空間，隨著齒的旋轉(zhuǎn)沿殼體運(yùn)動，Z后在兩齒嚙合時排出。
在術(shù)語上講，齒輪泵也叫正排量裝置，即像一個缸筒內(nèi)的活塞，當(dāng)一個齒進(jìn)入另一個齒的流體空間時，液體就被機(jī)械性地擠排出來。因為液體是不可壓縮的，所以液體和齒就不能在同一時間占據(jù)同一空間，這樣，液體就被排除了。由于齒的不斷嚙合，這一現(xiàn)象就連續(xù)在發(fā)生，因而也就在泵的出口提供了一個連續(xù)排除量，泵每轉(zhuǎn)一轉(zhuǎn)，排出的量是一樣的。隨著驅(qū)動軸的不間斷地旋轉(zhuǎn)，泵也就不間斷地排出流體。泵的流量直接與泵的轉(zhuǎn)速有關(guān)。
實際上，在泵內(nèi)有很少量的流體損失，這使泵的運(yùn)行效率不能達(dá)到，因為這些流體被用來潤滑軸承及齒輪兩側(cè)，而泵體也絕不可能無間隙配合，故不能使流體地從出口排出，所以少量的流體損失是必然的。然而泵還是可以良好地運(yùn)行，對大多數(shù)擠出物料來說，仍可以達(dá)到93%～98%的效率。
對于粘度或密度在工藝中有變化的流體，這種泵不會受到太多影響。如果有一個阻尼器，比如在排出口側(cè)放一個濾網(wǎng)或一個限制器，泵則會推動流體通過它們。如果這個阻尼器在工作中變化，亦即如果濾網(wǎng)變臟、堵塞了，或限制器的背壓升高了，則泵仍將保持恒定的流量，直至達(dá)到裝置中Z弱的部件的機(jī)械極限(通常裝有一個扭矩限制器)。

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