單端面伽師機械密封

　　單端面伽師機械密封(如圖)由一對(dui)密(mi)(mi)(mi)封(feng)端(duan)(duan)面(mian)組(zu)成的為(wei)單(dan)(dan)端(duan)(duan)面(mian)密(mi)(mi)(mi)封(feng)，單(dan)(dan)端(duan)(duan)面(mian)密(mi)(mi)(mi)封(feng)結構簡(jian)單(dan)(dan)，制造(zao)、安裝(zhuang)容易，一般于介質(zhi)本身潤滑性好和允許(xu)微量泄(xie)漏的條件，是常(chang)用(yong)的密(mi)(mi)(mi)封(feng)型式，當介質(zhi)有(you)毒、易燃、易爆以及對(dui)泄(xie)漏量有(you)嚴格要求時，不(bu)宜使用(yong)。

　　雙端面伽師機械密封

　　雙端面伽師機械密封(如圖)是由二對密封(feng)(feng)端(duan)(duan)面(mian)(mian)組成的(de)為雙(shuang)端(duan)(duan)面(mian)(mian)密封(feng)(feng)。有軸向雙(shuang)端(duan)(duan)面(mian)(mian)密封(feng)(feng)和徑向雙(shuang)端(duan)(duan)面(mian)(mian)密封(feng)(feng)。沿徑向布置(zhi)的(de)雙(shuang)端(duan)(duan)面(mian)(mian)密封(feng)(feng)結構較(jiao)軸向雙(shuang)端(duan)(duan)面(mian)(mian)密封(feng)(feng)緊湊。雙(shuang)端(duan)(duan)面(mian)(mian)密封(feng)(feng)適(shi)用(yong)于介質本身(shen)潤滑(hua)性(xing)差、有毒、易(yi)(yi)燃、易(yi)(yi)爆、易(yi)(yi)揮(hui)發、含(han)磨粒及氣體(ti)等。

　　軸向雙端(duan)面(mian)(mian)(mian)(mian)密封(feng)有面(mian)(mian)(mian)(mian)對(dui)面(mian)(mian)(mian)(mian)或背(bei)靠(kao)背(bei)布置的(de)結構，工(gong)作時需在兩(liang)對(dui)端(duan)面(mian)(mian)(mian)(mian)間(jian)引入(ru)高于介質(zhi)(zhi)壓力0.05～0.15MPa的(de)封(feng)液以改善端(duan)面(mian)(mian)(mian)(mian)間(jian)的(de)潤滑及冷卻條件，并把介質(zhi)(zhi)與(yu)外界隔離，有可能實(shi)現介質(zhi)(zhi)“零泄漏”。