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你知道高頻變壓器油泵的基本常識嗎?</h3>
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<span>文章出處??a href=""><a >深圳市晨飛電子有限公??/a></a></span><span>網責任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
id="cntrHits">-</span></span><span>發(fā)表時間??014-08-22 16:00:00</span>
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<p> <span style="font-size: 16px"> 變壓器油泵，一種全密封結構的，內置潛油運行的三相異步電動機直軸驅動一離心式或軸流式葉片泵。專用于輸送變壓器絕緣油介質的流體機械。離心式變壓器油泵適用于變壓器強油風冷卻器;軸流式變壓器油泵(低揚程、大流量)適用于變壓器片式散熱器??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 按驅動電機結構劃分：目前國內配套采用 ①保守三相異步電動機專用潛油設計的普通型變壓器油??②軸向氣??盤式電機)電機驅動的盤式變壓器油泵。兩種結構的差異主要是驅動電動機不同，使用功能、裝置形式完全相同。但是由于盤式泵其特有的軸向磁拉力作用，運行中須及時更換磨損的軸承，以防止轉子落下引起強烈機械摩擦。目前國外仍普遍大量采用的還是保守三相異步電動機專用設計的普通型變壓器油??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 揚程、流量對于每一種特定型號的泵而言是不可替代的，因為每種型號泵的特性曲線上只有一點是效率最高的，泵工作的這一點叫額定工況點。泵工作在這一區(qū)域時，不只效率高，而且噪音低，功耗合理，運轉平穩(wěn)，無有害渦流沖擊和氣蝕損害，能夠堅持臨時可靠運行??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 以上所述工況點的選擇：由主變冷卻器強油循環(huán)油回路的管網系統(tǒng)阻力特性曲線所決定的，不同類型的冷卻器和主變油路循環(huán)結構，其管網特性曲線不同。管網系統(tǒng)阻力特性曲線與變壓器油泵工作特性曲線的交點就是油泵的額定工況點。因此，就變壓器油泵的替代性而言，不同水力參數(shù)或降低水力參數(shù)的隨意替代是不可取的關系主變的平安運行和冷卻器的額定換熱容量??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 目前，國內各電力網、局根據國電公司的要求：為提高變壓器油泵軸承運轉壽命，將??450????4極電??油泵，改??000????6極電??以下的油泵??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 1000????6極電??變壓器油泵要達到4極電??油泵的流量、揚程。勢必要靠增加葉輪直徑解決，旋轉機械的直徑增加則運行穩(wěn)定性會下降，而且6極驅動電機比4極電機的直徑要大。這樣，替代過程中，某些老式的冷卻器安裝尺寸(如配??B240-16/3V油泵)很難實現(xiàn)。長春諾森電機有限公司采用雙級泵結構，對此類油泵的替代問題加以解決，但制造本錢加大??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 其實，目前國內外泵類產品是向高速、高效方向發(fā)展。適當高轉速的</span><strong><a href="http://m.linhang.com.cn/Products/ETD44gaopinbianyaqil.html"><span style="font-size: 16px">高頻變壓??/span></a></strong><span style="font-size: 16px">油泵不只效率高而且體積小，運行穩(wěn)定性好。當然，低轉速可以提高軸承的運轉壽命。但是隨著葉輪直徑的增加，平衡問題將更加突出，特別是作為葉片泵其葉片鑄型、扭曲角度的一致性在工藝上誤差難免，這些都是影響運行穩(wěn)定性的關鍵因素，搞不好反而會降低軸承的運轉壽命??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 目前國內許多單位大量配套采用軸向氣隙(盤式電機)電機驅動的盤式變壓器油泵(這種油泵適宜作成低??000??分以??此類問題將更加突出。因為盤式電機的軸向磁拉力是很強的就是靠這種旋轉的軸向磁拉力進行磁電耦合使轉子旋轉起來，完成電能轉換的軸向磁拉力會使軸承的磨損量間隙直接轉化為定、轉子間氣隙的減少，直至定、轉子鐵與鐵的強烈摩擦??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 盤式電機非常適于制成剎車電機：定、轉子間裝置剎車片，通電剎車，失電自由旋轉。所以國外普遍大量采用的還是保守三相異步電動機專用設計的普通型變壓器油泵。只有我還在將盤式電機變壓器油泵作為一種新產品加以廣泛采用。如果運行中忽略對軸承的嚴密監(jiān)控，隨著這種結構油泵運行時間的累計，事故的概率會加大??/span></p>
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