在應用羅茨真空泵的全過程中,大多數羅茨真空泵在常壓下無法直接(jie)啟動。為(wei)什么(me)呢?我(wo)接(jie)下來向大家說明理由。
羅(luo)茨真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)可以(yi)包(bao)括低真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)用(yong)的(de)(de)直(zhi)(zhi)(zhi)接排(pai)氣(qi)常(chang)(chang)壓(ya)(ya)羅(luo)茨真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)、中高(gao)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)用(yong)的(de)(de)機械(xie)加壓(ya)(ya)泵(beng)(beng)(beng)(beng)、多級羅(luo)茨真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)。直(zhi)(zhi)(zhi)排(pai)大(da)氣(qi)根(gen)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)主(zhu)要是(shi)濕根(gen)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)和風冷(leng)根(gen)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)(多級根(gen)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)也可以(yi)直(zhi)(zhi)(zhi)接排(pai)風)。直(zhi)(zhi)(zhi)排(pai)大(da)氣(qi)型通道真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)為了實現常(chang)(chang)壓(ya)(ya)下的(de)(de)啟動,采用(yong)結構(gou)上犧牲真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)度(du)、增大(da)轉子(zi)間隙(xi)、改(gai)變轉子(zi)結構(gou)、強化冷(leng)卻(que)等方式實現高(gao)壓(ya)(ya)差下的(de)(de)運行(多級通道泵(beng)(beng)(beng)(beng)采用(yong)多級轉子(zi)串聯(lian)實現高(gao)壓(ya)(ya)差運行)。很多根(gen)源真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵(beng)(beng)(beng)(beng)在常(chang)(chang)壓(ya)(ya)下無法直(zhi)(zhi)(zhi)接啟動。
一般的(de)羅(luo)茨真空(kong)泵(beng)(beng)(機(ji)械(xie)加壓泵(beng)(beng)),為了確保真空(kong)度和排(pai)氣效率,沒有采(cai)用上(shang)述變(bian)化。如(ru)果(guo)直接(jie)排(pai)出大氣,則吸(xi)引口與吸(xi)引口的(de)壓差過大,吸(xi)引真空(kong)泵(beng)(beng)過載,無(wu)(wu)法(fa)動作。此時,若增大羅(luo)茨真空(kong)泵(beng)(beng)馬(ma)達(da)的(de)電(dian)力,則熱(re)(re)量增加,羅(luo)茨真空(kong)泵(beng)(beng)轉子(zi)過熱(re)(re)而無(wu)(wu)法(fa)散熱(re)(re),殼體的(de)散熱(re)(re)快,之(zhi)間(jian)(jian)產生高(gao)溫(wen)差,羅(luo)茨真空(kong)泵(beng)(beng)轉子(zi)的(de)熱(re)(re)膨(peng)脹加速,它(ta)們之(zhi)間(jian)(jian)和泵(beng)(beng)室之(zhi)間(jian)(jian)的(de)間(jian)(jian)隙消(xiao)失而固定。
因此,為了使羅茨真空泵達到高(gao)真(zhen)(zhen)空(kong)度,必須確保(bao)羅茨真(zhen)(zhen)空(kong)泵(beng)的轉子和泵(beng)室之間(jian)的間(jian)隙(xi)。因此,大(da)部(bu)分中高(gao)真(zhen)(zhen)空(kong)泵(beng)應配(pei)備前置泵(beng),將系統中的壓力引出(chu)一定范(fan)圍,然后啟動(dong)真(zhen)(zhen)空(kong)泵(beng),保(bao)證進出(chu)口壓差在合理范(fan)圍內,避免壓差過(guo)高(gao)真(zhen)(zhen)空(kong)泵(beng)過(guo)載。
真(zhen)(zhen)空(kong)(kong)泵(beng)的前段(duan)泵(beng),除了水環真(zhen)(zhen)空(kong)(kong)泵(beng)、油封(feng)式真(zhen)(zhen)空(kong)(kong)泵(beng)、往復(fu)式真(zhen)(zhen)空(kong)(kong)泵(beng)等可以直接排出大(da)氣的真(zhen)(zhen)空(kong)(kong)泵(beng)之外,與無油真(zhen)(zhen)空(kong)(kong)泵(beng)相(xiang)結合,可以選擇大(da)范(fan)圍、大(da)吸引(yin)速度的無油真(zhen)(zhen)空(kong)(kong)系統.