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src="http://cdn.myxypt.com/624844df/22/09/d27861ee7ac83c72cdc3d19eaa01db01f6745de2.jpg"/></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">通常風機的風量范圍很寬（如圖中Q1—Q2）,不能按照樣本給定的范圍去隨意認定風量。</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">因為風機的工作點只有一個，就是m點，Qm是一給定的風量值，m點是風機性能曲線與管道阻力曲線的交點。</span></p><p style="text-align: center; line-height: 3em; text-indent: 0em;"><img src="http://cdn.myxypt.com/624844df/22/09/0c6f825c2f7cc32922685b1441112439f54f30a1.png" width="600" height="554" border="0" vspace="0" title="沈陽布袋除塵器" alt="沈陽布袋除塵器" style="width: 600px; height: 554px;"/></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">二、風機風壓與管道阻力</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">1、風機風壓的概念</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">風機只有克服管道系統的阻力才能運行，為此風機須保持足夠的風壓，風壓是對沖風管阻力的。</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">什么是風壓？</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">風壓分動壓和靜壓，靜壓動壓之和叫全壓</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">動壓：P動由氣流速度決定</span></p><p style="text-indent: 2em; line-height: 3em;"><img src="http://cdn.myxypt.com/624844df/22/09/6edf989dbdab1b636bf2c232786792a38722a309.jpg"/></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">V—管道內的風速，m/s</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> r—氣體密度（20℃時空氣密度為1.2）</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> g—重力加速度</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> 靜壓：P靜大氣壓用Pa或mm水柱表示</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">靜壓通常是指管道內和管道外的靜壓差，而不是管道內的靜壓，這是因為風機工作是將管道內的氣體輸送到環境中去，整個管道是與大氣連通的，所以靜壓指的是相對值（即表壓）。</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">無論靜壓和動壓都表示一種壓強。</span></p><p style="text-indent: 2em; line-height: 3em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">風機靜壓與動壓之和叫全壓。</span></p></div>  <div id="xy-share" class="pull-right"> <div class="social-share" data-sites="weibo, wechat, qq, qzone, douban"></div> </div> <div class="xypg-detail-tags"> <div class="tags-title"> 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