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<div>　　高壓風(fēng)機(jī)管道中局部阻力的來(lái)源和控制措施</div><div>　　高壓風(fēng)機(jī)是指在設(shè)計(jì)條件下，風(fēng)壓為30kPa~200KPa或壓縮比e=1.3~3的風(fēng)機(jī)。當(dāng)前行業(yè)內(nèi)一般是把氣環(huán)式真空泵劃歸為高壓風(fēng)機(jī)。高壓風(fēng)機(jī)，也叫高壓鼓風(fēng)機(jī)，區(qū)別于一般離心式鼓風(fēng)機(jī) 風(fēng)機(jī)。</div><div>　　當(dāng)葉輪轉(zhuǎn)動(dòng)時(shí)，由于離心力的作用，風(fēng)向標(biāo)促使氣體向前向外運(yùn)動(dòng)，從而形成一系列螺旋狀的運(yùn)動(dòng)。葉輪刀片之間的空氣呈螺旋狀加速旋轉(zhuǎn)并將泵體之外的氣體擠入(由吸氣口吸入)側(cè)槽,當(dāng)它進(jìn)入側(cè)通道以后，氣體被壓縮，然后又回復(fù)到葉輪刀片間再次加速旋轉(zhuǎn)。當(dāng)空氣沿著一條螺旋形軌道穿過(guò)葉輪和側(cè)槽時(shí)，每個(gè)葉輪片增加了壓縮和加速的程度,隨著旋轉(zhuǎn)的進(jìn)行，氣體的動(dòng)能增加，使得沿側(cè)通道通過(guò)的氣體壓力進(jìn)一步增加。當(dāng)空氣到達(dá)側(cè)槽與排放法蘭的連接點(diǎn)，氣體即被擠出葉片并通過(guò)出口消聲器排出泵體。</div><div>　　高壓風(fēng)機(jī)運(yùn)行過(guò)程中也會(huì)受到來(lái)自不同方面的阻力，這也是設(shè)備能耗的主要來(lái)源，也是影響設(shè)備運(yùn)行效果的關(guān)鍵。其實(shí)高壓風(fēng)機(jī)管道中氣體會(huì)同時(shí)受到推動(dòng)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(dòng)的阻力也要分兩方面來(lái)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(yùn)用高壓風(fēng)機(jī)，需要掌握高壓風(fēng)機(jī)管道內(nèi)局部阻力的控制方式。</div><div>　　以局部阻力來(lái)說(shuō)，它是空氣流經(jīng)管道時(shí)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(shuō)各種變徑管、風(fēng)管進(jìn)出口、閥門、彎頭三通、四通、排風(fēng)口等發(fā)生變化的時(shí)候，都會(huì)產(chǎn)生局部阻力。</div><div>　　所以說(shuō)，局部阻力高壓風(fēng)機(jī)系統(tǒng)中占的比例還是比較大的，為了不影響它的正常運(yùn)行，設(shè)計(jì)的時(shí)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?gòu)濐^。</div><div>　　如果用的是圓形風(fēng)管彎頭的話，它的曲率半徑要大于管徑;矩形風(fēng)管彎頭斷面的長(zhǎng)寬比也是越大越好;矩形直角彎頭在其中設(shè)導(dǎo)流片。為了減小三通的局部阻力，應(yīng)注意支管和干管的連接，減小其夾角并且使支管和干管內(nèi)的流速維持相等還是非常有幫助的。</div> 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