螺(luo)桿鼓(gu)風機的(de)密封(feng)(feng)裝置(zhi)包括靜密封(feng)(feng)與動密封(feng)(feng)。

其中(zhong)，螺桿鼓風機的靜密封(feng)所在主要包(bao)括端(duan)(duan)蓋與端(duan)(duan)蓋處、齒輪(lun)箱蓋與端(duan)(duan)蓋處，以及端(duan)(duan)蓋與泵腔處，這三處。靜密封(feng)部(bu)件比較簡單，一般(ban)采用真(zhen)空耐油的橡膠圈即(ji)可(ke)。

螺(luo)桿鼓風機的(de)(de)密(mi)(mi)封(feng)(feng)難(nan)點主要在(zai)于轉軸(zhou)(zhou)(zhou)與(yu)泵蓋(gai)(gai)(gai)處的(de)(de)動(dong)密(mi)(mi)封(feng)(feng)部(bu)件。動(dong)密(mi)(mi)封(feng)(feng)的(de)(de)密(mi)(mi)封(feng)(feng)裝置也主要分為三處：首先是傳(chuan)(chuan)動(dong)軸(zhou)(zhou)(zhou)軸(zhou)(zhou)(zhou)伸通(tong)過齒輪(lun)箱蓋(gai)(gai)(gai)與(yu)前蓋(gai)(gai)(gai)處的(de)(de)密(mi)(mi)封(feng)(feng)；其(qi)次是排氣口側傳(chuan)(chuan)動(dong)軸(zhou)(zhou)(zhou)通(tong)過泵前端蓋(gai)(gai)(gai)處的(de)(de)動(dong)密(mi)(mi)封(feng)(feng)；第三處就是進氣口側傳(chuan)(chuan)動(dong)軸(zhou)(zhou)(zhou)通(tong)過泵后端蓋(gai)(gai)(gai)的(de)(de)動(dong)密(mi)(mi)封(feng)(feng)。

目前，螺桿鼓風機(ji)的(de)動(dong)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)件在(zai)齒(chi)輪箱蓋附近多為骨架油封(feng)(feng)(feng)(feng)(feng)，進氣(qi)口側多采用雙唇(chun)型(xing)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈或機械(xie)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)，排氣(qi)口側多為機械(xie)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)、唇(chun)形(xing)(xing)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)、氮(dan)氣(qi)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)或其組(zu)合形(xing)(xing)式(shi)(shi)。像螺桿真空(kong)泵(beng)(beng)(beng)廠家介紹過的(de)磁流體(ti)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)這些還未見用于螺桿真空(kong)泵(beng)(beng)(beng)的(de)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)裝置(zhi)(zhi)中。這些密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)裝置(zhi)(zhi)形(xing)(xing)式(shi)(shi)，相對來說，唇(chun)形(xing)(xing)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)結(jie)構簡單、成(cheng)本(ben)低，但是使用壽命較(jiao)短；機械(xie)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)工(gong)作穩定(ding)，密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)性好，但成(cheng)本(ben)相對較(jiao)高。而且(qie)由于泵(beng)(beng)(beng)有壓(ya)縮過程，排氣(qi)端處溫(wen)度(du)較(jiao)高，機械(xie)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)在(zai)高溫(wen)工(gong)作下(xia)端面磨損(sun)劇烈，如果溫(wen)升過高會大大縮短機械(xie)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)的(de)壽命。