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大型風機噪聲控制

風(feng)(feng)(feng)機(ji)噪(zao)聲(sheng)(sheng)的(de)聲(sheng)(sheng)級(ji),不(bu)(bu)僅與其(qi)風(feng)(feng)(feng)機(ji)的(de)結構形式有(you)(you)關,而(er)且還同(tong)(tong)(tong)(tong)其(qi)工(gong)作(zuo)狀(zhuang)態(由全壓和風(feng)(feng)(feng)量決定)有(you)(you)關。不(bu)(bu)同(tong)(tong)(tong)(tong)系(xi)列、不(bu)(bu)同(tong)(tong)(tong)(tong)型號(hao)的(de)風(feng)(feng)(feng)機(ji),其(qi)聲(sheng)(sheng)級(ji)是(shi)不(bu)(bu)一(yi)樣的(de)。同(tong)(tong)(tong)(tong)一(yi)風(feng)(feng)(feng)機(ji),在(zai)不(bu)(bu)同(tong)(tong)(tong)(tong)工(gong)況下(xia),其(qi)聲(sheng)(sheng)級(ji)也是(shi)不(bu)(bu)同(tong)(tong)(tong)(tong)的(de)。風(feng)(feng)(feng)機(ji)工(gong)作(zuo)在(zai)最高效率點時(shi),聲(sheng)(sheng)級(ji)往往取量低值。為了更好表征(zheng)風(feng)(feng)(feng)機(ji)的(de)噪(zao)聲(sheng)(sheng)性能,出(chu)現了比(bi)A級(ji)這個(ge)概(gai)念。比(bi)A聲(sheng)(sheng)級(ji)是(shi)指通風(feng)(feng)(feng)機(ji)在(zai)單(dan)位流量(1米/分)和單(dan)位全壓(1毫米水(shui)柱(zhu))下(xia)所產生的(de)A聲(sheng)(sheng)級(ji)。。同(tong)(tong)(tong)(tong)一(yi)風(feng)(feng)(feng)機(ji)在(zai)不(bu)(bu)同(tong)(tong)(tong)(tong)工(gong)況下(xia)的(de)比(bi)A聲(sheng)(sheng)級(ji)是(shi)不(bu)(bu)同(tong)(tong)(tong)(tong)的(de)。


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  風(feng)(feng)(feng)機噪聲的(de)聲級(ji),不僅(jin)與其(qi)風(feng)(feng)(feng)機的(de)結構(gou)形式有關(guan),而且(qie)還同其(qi)工作(zuo)狀態(由(you)全壓和風(feng)(feng)(feng)量(liang)決定)有關(guan)。不同系列、不同型號的(de)風(feng)(feng)(feng)機,其(qi)聲級(ji)是(shi)不一(yi)樣的(de)。同一(yi)風(feng)(feng)(feng)機,在不同工況下,其(qi)聲級(ji)也是(shi)不同的(de)。風(feng)(feng)(feng)機工作(zuo)在極(ji)高效率點時,聲級(ji)往往取量(liang)低值(zhi)。

  為了(le)更好表征風(feng)機的(de)(de)(de)噪(zao)聲性能,出現了(le)比(bi)(bi)(bi)A級(ji)(ji)這個概念。比(bi)(bi)(bi)A聲級(ji)(ji)是指通風(feng)機在單(dan)(dan)位(wei)流量(liang)(1米/分)和單(dan)(dan)位(wei)全壓(1毫米水柱)下所(suo)產生的(de)(de)(de)A聲級(ji)(ji)。。同(tong)(tong)一風(feng)機在不同(tong)(tong)工(gong)(gong)況下的(de)(de)(de)比(bi)(bi)(bi)A聲級(ji)(ji)是不同(tong)(tong)的(de)(de)(de)。在極高效率點上,比(bi)(bi)(bi)A聲級(ji)(ji)取量(liang)低(di)值(zhi)。不同(tong)(tong)系列(lie)的(de)(de)(de)風(feng)機在額定工(gong)(gong)況下的(de)(de)(de)比(bi)(bi)(bi)A聲級(ji)(ji)表征了(le)該(gai)系列(lie)風(feng)機噪(zao)聲級(ji)(ji)的(de)(de)(de)高低(di)和產品(pin)質量(liang)的(de)(de)(de)優劣。所(suo)以國(guo)內外多采用比(bi)(bi)(bi)A聲級(ji)(ji)作為風(feng)機噪(zao)聲的(de)(de)(de)限值(zhi)指標。同(tong)(tong)一系列(lie)不同(tong)(tong)型(xing)號的(de)(de)(de)風(feng)機,其比(bi)(bi)(bi)A聲級(ji)(ji)大(da)體相近。風(feng)機加(jia)工(gong)(gong)精(jing)度愈(yu)(yu)高,氣(qi)動(dong)性能愈(yu)(yu)好,比(bi)(bi)(bi)A聲級(ji)(ji)愈(yu)(yu)低(di)。