進(jìn)口三螺桿泵美國(guó)進(jìn)口品牌

工作原理：

三螺桿泵是利用螺桿的回轉(zhuǎn)來(lái)吸排液體的。圖1表示三螺桿泵的剖視圖。圖中，中間螺桿為主動(dòng)螺桿，由原動(dòng)機(jī)帶動(dòng)回轉(zhuǎn)，兩邊的螺桿為從動(dòng)螺桿，隨主動(dòng)螺桿作反向旋轉(zhuǎn)。主、從動(dòng)螺桿的螺紋均為雙頭螺紋。

由于各螺桿的相互嚙合以及螺桿與襯筒內(nèi)壁的緊密配合，在泵的吸入口和排出口之間，就會(huì)被分隔成一個(gè)或多個(gè)密封空間。隨著螺桿的轉(zhuǎn)動(dòng)和嚙合，這些密封空間在泵的吸入端不斷形成，將吸入室中的液體封入其中，并自吸入室沿螺桿軸向連續(xù)地推移至排出端。

將封閉在各空間中的液體不斷排出，猶如一在螺紋回轉(zhuǎn)時(shí)被不斷向前推進(jìn)的情形那樣，這就是螺桿泵的基本工作原理。

結(jié)構(gòu)說(shuō)明：

三螺桿泵的內(nèi)部結(jié)構(gòu)主要由一根主動(dòng)螺桿 （簡(jiǎn)稱主桿）、兩根從動(dòng)螺桿 （簡(jiǎn)稱從桿）和包容這三根螺桿的襯套組成。主桿為凸型雙頭螺紋，從桿為凹型雙頭螺紋，二者的螺旋方向相反。

三螺桿泵屬于容積式泵，它的壓力決定于與它連接的系統(tǒng)的總阻力。為了防止由于某種原因使管路的阻力突然增加，以至使泵的壓力超過(guò)允許值而損壞泵、原動(dòng)機(jī)或管路系統(tǒng)，泵必須配帶安全閥或其他過(guò)壓保護(hù)裝置。

三螺桿泵工作時(shí)，由于兩從動(dòng)螺桿與主動(dòng)螺桿左右對(duì)稱嚙合，故作用在主動(dòng)螺桿上的徑向力*平衡，主動(dòng)螺桿不承受彎曲負(fù)荷。從動(dòng)螺桿所受徑向力沿其整個(gè)長(zhǎng)度都由泵缸襯套來(lái)支承，因此，不需要在外端另設(shè)軸承，基本上也不承受彎曲負(fù)荷。在運(yùn)行中，螺桿外圓表面和泵缸內(nèi)壁之間形成的一層油膜，可防止金屬之間的直接接觸，使螺桿齒面的磨損大大減少。

三螺桿泵工作時(shí)，兩端分別作用著液體的吸排壓力，因此對(duì)螺桿要產(chǎn)生軸向推力。對(duì)于壓差小于10千克力/cm2的小型泵，可以采用止推軸承。此外，還通過(guò)主動(dòng)螺桿的*油孔將高壓油引入各螺桿軸套的底部，從而在螺桿下端產(chǎn)生一個(gè)與軸向推力方向相反的平衡推力。螺桿泵和其它容積泵一樣，當(dāng)泵的排出口*封閉時(shí)，泵內(nèi)的壓力就會(huì)上升到使泵損壞或使電動(dòng)機(jī)過(guò)載的危險(xiǎn)程度。所以，在泵的吸排口處，就必須設(shè)置安全閥。

（美國(guó)ARCADIA阿卡迪亞）

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商用建筑行業(yè)面臨著一系列的挑戰(zhàn)，這些挑戰(zhàn)將會(huì)重新定義未來(lái)數(shù)年我們對(duì)于建筑的思考方式。
宏觀上看，氣候變化呼吁我們每個(gè)人采取行動(dòng)來(lái)改變現(xiàn)有狀況。這意味著建筑物必須遵守嚴(yán)格的可持續(xù)發(fā)展標(biāo)準(zhǔn)以保持低能耗和高靈活性。微觀處，咨詢工程師們卻面臨著工程多，監(jiān)理時(shí)間嚴(yán)重不足的難題。因此，快速方便地獲取正確的信息顯得尤為重要。

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(Arcadia, USA)

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