反壓狀態是不良的工作狀態，介質中的顆粒、雜質很容易進入密封面，使密封失效。磨軸的主要件為橡膠波紋管，且由于上端密封面處于不良潤滑狀態，動靜環之間的摩擦力矩大于橡膠波紋管與軸之間的傳遞轉矩，從而發生相對轉動。動、靜環輔助密封由于受到污水中的弱酸、弱堿的腐蝕，橡膠件已無彈性。渣漿泵用精河機械密封的工作原理要求精河機械密封內部無任何雜質，在組裝精河機械密封前要徹底清掃動環、靜環、軸套等部件，檢查動靜環表面是否存在劃痕、裂紋等缺陷，這些缺陷存在會造成精河機械密封嚴(yan)重(zhong)漏泄(xie)。必要時可(ke)以制作工(gong)裝(zhuang)在組裝(zhuang)前水壓試驗，檢(jian)查動靜環座是否存(cun)在影響(xiang)密封的(de)缺陷。

　　渣漿精河泵用精河機械密封由于密封面變形所引起的，而且精河機械密封面泄漏的概率是很高的。如果泵在啟動時就發生精河泵用精河機械密封泄漏，而拆查密封面時看不見有損壞的地方，這時就應該用平晶檢查精河機械密封的變(bian)形情況(kuang)。如果發生(sheng)變(bian)形，用平晶檢查密封面(mian)(mian)的干涉帶的變(bian)化(hua)情況(kuang)，密封面(mian)(mian)變(bian)形存在(zai)于動環和靜環之間。

　　壓缸(gang)(gang)體(ti)(ti)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)系統(tong)采用(yong)的(de)(de)(de)(de)(de)是主密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)設(she)計，一般都用(yong)U型(xing)(xing)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)圈。液壓缸(gang)(gang)體(ti)(ti)的(de)(de)(de)(de)(de)往復(fu)(fu)式動(dong)(dong)(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)系統(tong)的(de)(de)(de)(de)(de)設(she)計，開始使用(yong)了更加復(fu)(fu)雜的(de)(de)(de)(de)(de)U型(xing)(xing)圈和(he)同軸(zhou)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)組件的(de)(de)(de)(de)(de)復(fu)(fu)合(he)(he)式設(she)計。密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)的(de)(de)(de)(de)(de)靜(jing)環(huan)(huan)(huan)通常固定在殼(ke)體(ti)(ti)上，動(dong)(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)通過彈簧(huang)、彈簧(huang)座與軸(zhou)一同旋轉。靜(jing)環(huan)(huan)(huan)與殼(ke)體(ti)(ti)、動(dong)(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)與軸(zhou)形成的(de)(de)(de)(de)(de)間隙用(yong)成型(xing)(xing)填料密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)。在動(dong)(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和(he)靜(jing)環(huan)(huan)(huan)接觸(chu)的(de)(de)(de)(de)(de)端面形成相對滑動(dong)(dong)(dong)(dong)(dong)(dong)(dong)面，即動(dong)(dong)(dong)(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)面。為(wei)保(bao)證密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)良(liang)好，動(dong)(dong)(dong)(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)面應十分平直(zhi)和(he)光潔(jie)。彈簧(huang)力和(he)被密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)的(de)(de)(de)(de)(de)流體(ti)(ti)壓力使動(dong)(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)貼緊(jin)靜(jing)環(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)與軸(zhou)通過彈簧(huang)連接，動(dong)(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和(he)靜(jing)環(huan)(huan)(huan)間貼合(he)(he)性(xing)受(shou)軸(zhou)的(de)(de)(de)(de)(de)振動(dong)(dong)(dong)(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)(dong)(dong)(dong)影響較小。靜(jing)環(huan)(huan)(huan)一般常用(yong)潤滑性(xing)好的(de)(de)(de)(de)(de)軟質材料如(ru)石墨、填充(chong)聚四氟乙烯等，動(dong)(dong)(dong)(dong)(dong)(dong)(dong)環(huan)(huan)(huan)多用(yong)硬質合(he)(he)金(jin)、陶瓷(ci)等材料制造。