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。渣漿原平泵用原平機械密封的工作原理要求原平機械密封內部無任何雜質，在組裝原平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原平機械密封嚴重漏泄。必(bi)要時可以制(zhi)作工裝在組裝前水壓試驗，檢查動(dong)靜環座(zuo)是否存在影響密封(feng)的缺陷。

　　渣漿原平泵用原平機械密封由于密封面變形所引起的，而且原平機械密封面泄漏的概率是很高的。如果泵在啟動時就發生原平泵用原平機械密封泄漏，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原平機械密封的變形情況。如果發生變形，用平晶檢(jian)查密封面的干涉帶的變化情況，密封面變形存(cun)在于動環和靜環之間。

　　壓(ya)缸體(ti)(ti)動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)統(tong)采用(yong)的(de)(de)是主密(mi)(mi)(mi)封(feng)(feng)(feng)設計(ji)，一般(ban)都用(yong)U型密(mi)(mi)(mi)封(feng)(feng)(feng)圈(quan)。液壓(ya)缸體(ti)(ti)的(de)(de)往復式動(dong)(dong)(dong)(dong)態密(mi)(mi)(mi)封(feng)(feng)(feng)系(xi)統(tong)的(de)(de)設計(ji)，開(kai)始(shi)使用(yong)了更加復雜的(de)(de)U型圈(quan)和(he)同軸(zhou)(zhou)(zhou)(zhou)密(mi)(mi)(mi)封(feng)(feng)(feng)組件的(de)(de)復合式設計(ji)。密(mi)(mi)(mi)封(feng)(feng)(feng)的(de)(de)靜環(huan)(huan)(huan)(huan)通常固定在殼體(ti)(ti)上，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)通過(guo)(guo)彈(dan)簧(huang)(huang)、彈(dan)簧(huang)(huang)座與軸(zhou)(zhou)(zhou)(zhou)一同旋轉。靜環(huan)(huan)(huan)(huan)與殼體(ti)(ti)、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與軸(zhou)(zhou)(zhou)(zhou)形成的(de)(de)間隙用(yong)成型填(tian)料密(mi)(mi)(mi)封(feng)(feng)(feng)。在動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和(he)靜環(huan)(huan)(huan)(huan)接觸的(de)(de)端面形成相對滑動(dong)(dong)(dong)(dong)面，即動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)(feng)(feng)面。為保(bao)證密(mi)(mi)(mi)封(feng)(feng)(feng)良好，動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)封(feng)(feng)(feng)面應十分平直和(he)光潔。彈(dan)簧(huang)(huang)力(li)和(he)被密(mi)(mi)(mi)封(feng)(feng)(feng)的(de)(de)流體(ti)(ti)壓(ya)力(li)使動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)貼緊靜環(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)與軸(zhou)(zhou)(zhou)(zhou)通過(guo)(guo)彈(dan)簧(huang)(huang)連接，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)和(he)靜環(huan)(huan)(huan)(huan)間貼合性受軸(zhou)(zhou)(zhou)(zhou)的(de)(de)振動(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)影響較小。靜環(huan)(huan)(huan)(huan)一般(ban)常用(yong)潤滑性好的(de)(de)軟質材料如(ru)石墨、填(tian)充聚(ju)四氟乙(yi)烯等，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)(huan)多用(yong)硬質合金、陶瓷(ci)等材料制(zhi)造(zao)。