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class="left"> <strong>技術文章 </strong>/ article </span> <span id="az3h0fd4mnm" class="right"><img src="/skins/147426/images/home.png">您的位置：<a href="/">網站首頁</a> > <a href="/article.html">技術文章</a> > 高壓風機管道中局部阻力的來源和控制措施</span> </div> <div id="az3h0fd4mnm" class="right_content"> <div id="az3h0fd4mnm" class="art-cont"> <h1 class="art-title">高壓風機管道中局部阻力的來源和控制措施</h1> <div id="az3h0fd4mnm" class="art-info"> 發(fā)布時間： 2021-01-15　　點擊次數(shù)： 2112次 </div> <div id="az3h0fd4mnm" class="art-body"> <div>　　高壓風機管道中局部阻力的來源和控制措施</div><div>　　高壓風機是指在設計條件下，風壓為30kPa~200KPa或壓縮比e=1.3~3的風機。當前行業(yè)內一般是把氣環(huán)式真空泵劃歸為高壓風機。高壓風機，也叫高壓鼓風機，區(qū)別于一般離心式鼓風機風機。</div><div>　　當葉輪轉動時，由于離心力的作用，風向標促使氣體向前向外運動，從而形成一系列螺旋狀的運動。葉輪刀片之間的空氣呈螺旋狀加速旋轉并將泵體之外的氣體擠入(由吸氣口吸入)側槽,當它進入側通道以后，氣體被壓縮，然后又回復到葉輪刀片間再次加速旋轉。當空氣沿著一條螺旋形軌道穿過葉輪和側槽時，每個葉輪片增加了壓縮和加速的程度,隨著旋轉的進行，氣體的動能增加，使得沿側通道通過的氣體壓力進一步增加。當空氣到達側槽與排放法蘭的連接點，氣體即被擠出葉片并通過出口消聲器排出泵體。</div><div>　　高壓風機運行過程中也會受到來自不同方面的阻力，這也是設備能耗的主要來源，也是影響設備運行效果的關鍵。其實高壓風機管道中氣體會同時受到推動力和阻力的作用，從而得到不同的流通速度。</div><div>　　而氣體流動的阻力也要分兩方面來考慮，一方面是摩擦阻力，還有一方面就是局部阻力。為了能更好的運用高壓風機，需要掌握高壓風機管道內局部阻力的控制方式。</div><div>　　以局部阻力來說，它是空氣流經管道時由于流速的大小和方向改變以及渦流造成的能量丟失，也就是說各種變徑管、風管進出口、閥門、彎頭三通、四通、排風口等發(fā)生變化的時候，都會產生局部阻力。</div><div>　　所以說，局部阻力高壓風機系統(tǒng)中占的比例還是比較大的，為了不影響它的正常運行，設計的時候就要記憶注意，盡量減小局部阻力。常用的方式是盡量以直線排管，減少彎頭。</div><div>　　如果用的是圓形風管彎頭的話，它的曲率半徑要大于管徑;矩形風管彎頭斷面的長寬比也是越大越好;矩形直角彎頭在其中設導流片。為了減小三通的局部阻力，應注意支管和干管的連接，減小其夾角并且使支管和干管內的流速維持相等還是非常有幫助的。</div> </div> <div id="az3h0fd4mnm" class="art-next"> <dl class="shangxia"> <dd>上一篇：<a 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