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齒輪泵技術(shù)
您的當(dāng)前位置：巴特首頁(yè) > 技術(shù)支持 > 齒輪泵技術(shù) >不銹鋼齒輪泵的5大特點(diǎn)
來(lái)源：巴特計(jì)量泵、齒輪泵公司 發(fā)布時(shí)間：2013-12-09 10:46:18 瀏覽次數(shù)：次
1、滑動(dòng)軸承
不銹鋼齒輪泵滑動(dòng)軸承的材料有浸漬石墨、填充聚四氟乙烯、工程陶瓷等。由于工程陶瓷具有很好的耐熱、耐腐蝕、耐摩擦性能，所以不銹鋼齒輪泵的滑動(dòng)軸承多采用工程陶瓷制作。由于工程陶瓷很脆且膨脹系數(shù)小，所以軸承間隙不得過(guò)小，以免發(fā)生抱軸事故。由于不銹鋼齒輪泵的滑動(dòng)軸承以所輸送的介質(zhì)進(jìn)行潤(rùn)滑，所以應(yīng)根據(jù)不同的介質(zhì)及使用工況，選用不同的材質(zhì)制作軸承。
2、隔離套
在采用金屬隔離套時(shí)，隔離套處于一個(gè)正弦交變的磁場(chǎng)中，在垂直于磁力線(xiàn)方向的截面上感應(yīng)出渦電流并轉(zhuǎn)化成熱量。渦流的表達(dá)式為：其中Pe－渦流；K—常數(shù)；n—泵的額定轉(zhuǎn)速；T－磁傳動(dòng)力矩；F－隔套內(nèi)的壓力；D－隔套內(nèi)徑；一材料的電阻率；—材料的抗拉強(qiáng)度。當(dāng)泵設(shè)計(jì)好后，n、T是工況給定的，要降低渦流只能從F、D等方面考慮。選用高電阻率、高強(qiáng)度的非金屬材料制作隔離套，在降低渦流方面效果十分明顯
3、冷卻潤(rùn)滑液流量的控制
不銹鋼齒輪泵運(yùn)轉(zhuǎn)時(shí)，必須用少量的液體對(duì)內(nèi)磁轉(zhuǎn)子與隔離套之間的環(huán)隙區(qū)域和滑動(dòng)軸承的摩擦副進(jìn)行沖洗冷卻。冷卻液的流量通常為泵設(shè)計(jì)流量的2%-3%，內(nèi)磁轉(zhuǎn)子與隔離套之間的環(huán)隙區(qū)域由于渦流而產(chǎn)生高熱量。當(dāng)冷卻潤(rùn)滑液不夠或沖洗孔不暢、堵塞時(shí)，將導(dǎo)致介質(zhì)溫度高于永磁體的工作溫度，使內(nèi)磁轉(zhuǎn)子逐步失去磁性，使磁力傳動(dòng)器失效。當(dāng)介質(zhì)為水或水基液時(shí)，可使環(huán)隙區(qū)域的溫升維持在3-5℃；當(dāng)介質(zhì)為烴或油時(shí)，可使環(huán)隙區(qū)域的溫升維持在5-8℃。
4、永磁體
由稀土永磁材料制成的永磁體工作溫度范圍廣(-45－400℃)，矯頑力高，磁場(chǎng)方向具有很好的各向異性，在同極相接近時(shí)也不會(huì)發(fā)生退磁現(xiàn)象，是一種很好的磁場(chǎng)源。
5、保護(hù)措施
當(dāng)磁力傳動(dòng)器的從動(dòng)部件在過(guò)載情況下運(yùn)行或轉(zhuǎn)子卡死時(shí)，磁力傳動(dòng)器的主、從動(dòng)部件會(huì)自動(dòng)滑脫，保護(hù)機(jī)泵。此時(shí)磁力傳動(dòng)器上的永磁體在主動(dòng)轉(zhuǎn)子交變磁場(chǎng)的作用下，將產(chǎn)生渦損、磁損，造成永磁體溫度升高，磁力傳動(dòng)器滑脫失效。
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