單端面南口街道機械密封

　　單端面南口街道機械密封(如圖)由一(yi)對密(mi)封(feng)端面組成的為單端面密(mi)封(feng)，單端面密(mi)封(feng)結(jie)構簡單，制造(zao)、安(an)裝(zhuang)容易(yi)，一(yi)般于(yu)介質本身潤滑性好和允許微量泄(xie)漏的條(tiao)件，是常用的密(mi)封(feng)型式(shi)，當介質有(you)毒、易(yi)燃、易(yi)爆(bao)以及對泄(xie)漏量有(you)嚴格要求(qiu)時，不宜使用。

　　雙端面南口街道機械密封

　　雙端面南口街道機械密封(如(ru)圖)是(shi)由二對密封(feng)(feng)端(duan)(duan)(duan)面(mian)(mian)(mian)(mian)(mian)組成(cheng)的為雙(shuang)端(duan)(duan)(duan)面(mian)(mian)(mian)(mian)(mian)密封(feng)(feng)。有(you)軸向(xiang)雙(shuang)端(duan)(duan)(duan)面(mian)(mian)(mian)(mian)(mian)密封(feng)(feng)和徑向(xiang)雙(shuang)端(duan)(duan)(duan)面(mian)(mian)(mian)(mian)(mian)密封(feng)(feng)。沿徑向(xiang)布置(zhi)的雙(shuang)端(duan)(duan)(duan)面(mian)(mian)(mian)(mian)(mian)密封(feng)(feng)結構(gou)較(jiao)軸向(xiang)雙(shuang)端(duan)(duan)(duan)面(mian)(mian)(mian)(mian)(mian)密封(feng)(feng)緊湊。雙(shuang)端(duan)(duan)(duan)面(mian)(mian)(mian)(mian)(mian)密封(feng)(feng)適用于介質本(ben)身潤(run)滑性差、有(you)毒、易燃、易爆、易揮發、含(han)磨粒及氣體等(deng)。

　　軸向雙端(duan)面(mian)密封有面(mian)對(dui)面(mian)或背靠背布置的結(jie)構(gou)，工作時(shi)需(xu)在(zai)兩對(dui)端(duan)面(mian)間引入(ru)高(gao)于介(jie)質壓力0.05～0.15MPa的封液(ye)以改善端(duan)面(mian)間的潤滑及(ji)冷卻條件，并把介(jie)質與外界隔離，有可能實現(xian)介(jie)質“零泄(xie)漏”。