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巴特看國內(nèi)外高粘度齒輪泵的發(fā)展特點
來源：巴特計量泵、齒輪泵公司 發(fā)布時間：2013-11-18 16:32:39 瀏覽次數(shù)：次
據(jù)鄭州巴特熔體泵了解，如今雖然國內(nèi)企業(yè)產(chǎn)生了大量的齒輪泵適用于輸送高粘度液體，但作為測試結(jié)果的手腕不是完美的，材料的選擇、顯示，仍有一些問題和噪音控制。特別的是國內(nèi)高粘度齒輪泵在條款的有效性、可靠性和應(yīng)用他們的生活是一個大的差距與外國產(chǎn)品。因此，中國石油和化學(xué)工業(yè)如使用高粘度齒輪泵大多數(shù)仍然堅持入口。
國內(nèi)外高粘度齒輪泵的發(fā)展特色如下：
齒輪構(gòu)造
高粘度齒輪泵的齒輪常見的有直齒、斜齒、人字齒、螺旋齒，齒廓重要有漸開線和圓弧型式。通常小型齒輪泵多采用漸開線直齒輪，高溫齒輪泵常采用變位齒輪，輸送高粘度、高壓聚合物熔體的熔體泵多采用漸開線斜齒輪。齒輪與軸制成一體，其剛性及可靠性高于齒輪與軸單獨制作的齒輪泵。國外低壓齒輪泵的齒輪常采用方形結(jié)構(gòu)，即齒輪的齒寬即是齒頂圓直徑。而高壓場所使用的高粘度齒輪泵的輪齒寬度小于其齒頂圓直徑，這是為了減小齒輪的徑向受壓面積，下降齒輪、軸承的載荷。
泵體及加熱方法
一般來說，齒輪泵的泵殼越重，其耐溫度、耐壓強度也越高。泵體材料常采用球墨鑄鐵，亦可采用鑄造鋁合金硬模熔鑄而成，或采用擠壓鋁合金型材加工制作。當(dāng)輸送的介質(zhì)具有腐化性時，可采用本錢較高的不銹鋼材料。國外高粘度齒輪泵多采用含鎳、鉻量高的合金鋼作為泵殼資料，這種材料在強度、可靠性及本錢方面的綜合性能較好。為解決齒輪泵的困油現(xiàn)象，通常在泵蓋上開設(shè)對稱的卸荷槽，或向低壓側(cè)方向開設(shè)不對稱卸荷槽，吸液側(cè)采取錐形卸荷槽，排液側(cè)為矩形卸荷槽，卸荷槽的深度也比液壓產(chǎn)業(yè)中所用的齒輪泵要深。
由于高粘度齒輪泵輸送的介質(zhì)粘度較高，為減小流動阻力，進步泵的吸液才能，必需對介質(zhì)進行加熱或保溫。通常采取電熱元件加熱，可使粘性液體受熱均勻。若溫度波動不大，輸送的高粘度液體輕易產(chǎn)生降解時，建議采用流體加熱方法，特殊是排量大的齒輪泵。流體加熱又分內(nèi)置、外置式結(jié)構(gòu)。所謂內(nèi)置式是指在齒輪泵泵體或端蓋的內(nèi)部設(shè)計突熱套，外置式則是通過螺栓將夾熱套與泵體聯(lián)接在一起。往夾套內(nèi)通進蒸汽、導(dǎo)熱油，二手壓路機，還是冷卻水，要依據(jù)介質(zhì)具體情形而定。內(nèi)置式實用于對輸送液體溫度均勻性請求較高，或請求對高溫液體進行均勻冷卻的場所。當(dāng)電加熱方法缺少安全性或?qū)囟裙?jié)制請求不高時，可采用外置式構(gòu)造。美國VIKING公司生產(chǎn)的內(nèi)嚙合齒輪泵，其泵頭部分的夾套可以對輸送流體的溫度進行把持，無論是在高溫或低溫環(huán)境下，均可帶外置式夾套。
軸承材料、結(jié)構(gòu)與潤滑
高粘度齒輪泵軸承通常采用滑動軸承，在內(nèi)壁的軸承的軸承表面設(shè)計螺旋流道，螺旋槽的旋轉(zhuǎn)轉(zhuǎn)向齒輪軸和相同的。軸承外端和進口的泵相通，軸承內(nèi)整個螺旋溝和牙齒根（真空）是相互聯(lián)系的。當(dāng)軸旋轉(zhuǎn)，借助螺桿和兩個整體壓力軸承，軸承外部的低溫液體進入軸承和軸承潤滑和冷卻，拋棄之間流動的齒，二手移動吊車，構(gòu)成足夠的潤滑和冷卻快速螺旋自吸式低壓潤滑系統(tǒng)。優(yōu)勢的潤滑方法是：進入軸承潤滑劑是低溫介質(zhì)，粘度的潤滑劑是容易形成承載能力強勁的動壓油膜。大量的潤滑液循環(huán)不斷的帶走熱量，軸承在軸承良好的潤滑和冷卻效果。有足夠的液體來填補的嚙合齒根，大大改善了自吸性能的齒輪泵，避免空吸收現(xiàn)象，不僅可以提高音量的效果，但也減少噪音的空化和秋天。機械研究設(shè)計院四川省使用滑動軸承浸泡在中，并通過特殊通道強制潤滑，這項技術(shù)已經(jīng)被惠倫，聚酯纖維、橡膠、樹脂、肥料和其他類別的勝利用齒輪泵。
軸承材料常用的工具鋼，表面硬化處理，其抗膠來進步。如果介質(zhì)包含磨損顆粒，應(yīng)該很硬軸承材料，如陶瓷，二手挖掘機。近年來，GS - 1聚四氟乙烯鋼復(fù)合材料被認(rèn)為是一個幻想的滑動軸承材料。它是由冷軋鋼板（襯底）、多孔青銅粉末燒結(jié)球形或銅網(wǎng)（中間）和聚四氟乙烯（表層）、三復(fù)合層材料，兩者的優(yōu)點，既金屬和聚四氟乙烯。在上海，數(shù)據(jù)的基本上，材料研究和開發(fā)更好的性能的三層復(fù)合自潤滑材料的科幻小說，它的青銅屏幕代替青銅粉層，表面的塑料配方精心篩選。軸承的軸承材料抗疲勞、高、低摩擦系數(shù)、壽命長，是齒輪泵技術(shù)性能的新鮮軸承材料進度。
吸排油口
高粘度齒輪泵的吸液口管徑一般較大，有時采取擴散形吸液口來擴展低壓區(qū)的容積，以下降進口液體的流速，減小泵的吸液阻力。這種構(gòu)造還可以減小作用在軸頸及軸承上的徑向力，延伸高粘度齒輪泵的應(yīng)用壽命。
止回閥與安全閥
在齒輪泵的輸出管路上安裝有一個止回閥，這樣在檢驗泵及輸出管道時，體系中的液體不至于倒流；齒輪泵帶負(fù)荷停車時，在其輸出管道內(nèi)發(fā)生局部真空，可防止泵倒轉(zhuǎn)。高粘度齒輪泵的出口管路上還設(shè)置安全閥等維護裝置，這樣一旦泵的出口通道產(chǎn)生堵塞，就可以打開安全閥卸壓。安全閥可以與泵體或泵蓋鑄成一體，也可以單獨裝配。
鄭州巴特熔體泵有限公司
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熔體齒輪泵、熔體計量泵、化學(xué)泵、化工泵。
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