4-72離心風機的進風(feng)(feng)(feng)口(kou)(kou)的開關量(liang)往往是(shi)通(tong)(tong)過進風(feng)(feng)(feng)口(kou)(kou)調風(feng)(feng)(feng)門來實現，進風(feng)(feng)(feng)口(kou)(kou)調風(feng)(feng)(feng)門通(tong)(tong)過手(shou)動或電動方式來控(kong)制進風(feng)(feng)(feng)口(kou)(kou)進風(feng)(feng)(feng)量(liang)的大(da)小，進風(feng)(feng)(feng)量(liang)的大(da)小決定(ding)了(le)離(li)心(xin)風(feng)(feng)(feng)機的負荷，也就(jiu)是(shi)離(li)心(xin)風(feng)(feng)(feng)機所(suo)配電機的負荷大(da)小。

   通(tong)常情況下(xia)，4-72離心風(feng)(feng)(feng)機(ji)(ji)(ji)尤其是介(jie)質(zhi)為高溫氣(qi)體的(de)離心引風(feng)(feng)(feng)機(ji)(ji)(ji)，啟動時(shi)調(diao)(diao)風(feng)(feng)(feng)門(men)(men)是關(guan)閉(bi)(bi)的(de)，進風(feng)(feng)(feng)量(liang)接近(jin)零，因為制造工藝的(de)原因，調(diao)(diao)風(feng)(feng)(feng)門(men)(men)不(bu)是完(wan)全(quan)密(mi)閉(bi)(bi)，即使完(wan)全(quan)閉(bi)(bi)合，也會有少量(liang)氣(qi)體進入，這時(shi)電(dian)(dian)機(ji)(ji)(ji)的(de)符合最(zui)小(xiao)，一(yi)般為額(e)定(ding)電(dian)(dian)流(liu)的(de)三分之(zhi)一(yi)左右，隨著調(diao)(diao)風(feng)(feng)(feng)門(men)(men)的(de)逐(zhu)(zhu)漸增大(da)，也就是進風(feng)(feng)(feng)口開關(guan)量(liang)變大(da)，電(dian)(dian)機(ji)(ji)(ji)的(de)電(dian)(dian)流(liu)會逐(zhu)(zhu)漸上升，當開關(guan)量(liang)最(zui)大(da)時(shi)，電(dian)(dian)機(ji)(ji)(ji)的(de)負荷到(dao)達最(zui)大(da)，當然，對應(ying)不(bu)同性(xing)質(zhi)的(de)風(feng)(feng)(feng)機(ji)(ji)(ji)來講(jiang)，最(zui)大(da)負荷的(de)電(dian)(dian)機(ji)(ji)(ji)電(dian)(dian)流(liu)值并(bing)不(bu)相同，高壓離心風(feng)(feng)(feng)機(ji)(ji)(ji)最(zui)大(da)負荷時(shi)，電(dian)(dian)機(ji)(ji)(ji)電(dian)(dian)流(liu)高于(yu)額(e)定(ding)電(dian)(dian)流(liu)，中低(di)壓離心風(feng)(feng)(feng)機(ji)(ji)(ji)的(de)電(dian)(dian)流(liu)小(xiao)于(yu)等于(yu)額(e)定(ding)電(dian)(dian)流(liu)，總(zong)之(zhi)，風(feng)(feng)(feng)機(ji)(ji)(ji)進風(feng)(feng)(feng)口開關(guan)量(liang)的(de)大(da)小(xiao)與負荷成正比關(guan)系。