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。渣漿泵用上饒機械密封的工作原理要求上饒機械密封內部無任何雜質，在組裝上饒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上饒機械密封嚴重(zhong)漏泄。必要時(shi)可以(yi)制作工(gong)裝(zhuang)在組(zu)裝(zhuang)前水壓試驗(yan)，檢查動靜環座(zuo)是否存(cun)在影響密(mi)封的(de)缺(que)陷。

　　渣漿上饒泵用上饒機械密封由于密封面變形所引起的，而且上饒機械密封面泄漏的概率是很高的。如果泵在啟動時就發生上饒泵用上饒機械密封泄漏，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上饒機械密封的變(bian)形情況(kuang)。如果發(fa)生變(bian)形，用平晶檢查密(mi)封(feng)面(mian)的干涉(she)帶的變(bian)化情況(kuang)，密(mi)封(feng)面(mian)變(bian)形存在于動(dong)環(huan)和靜環(huan)之間。

　　壓缸(gang)體(ti)動(dong)(dong)(dong)態密(mi)(mi)封(feng)(feng)系(xi)統采用(yong)(yong)的是主密(mi)(mi)封(feng)(feng)設(she)(she)計(ji)，一(yi)(yi)般都用(yong)(yong)U型密(mi)(mi)封(feng)(feng)圈(quan)。液壓缸(gang)體(ti)的往(wang)復(fu)式(shi)(shi)動(dong)(dong)(dong)態密(mi)(mi)封(feng)(feng)系(xi)統的設(she)(she)計(ji)，開始使用(yong)(yong)了更加復(fu)雜的U型圈(quan)和(he)(he)(he)(he)同軸(zhou)(zhou)密(mi)(mi)封(feng)(feng)組件(jian)的復(fu)合式(shi)(shi)設(she)(she)計(ji)。密(mi)(mi)封(feng)(feng)的靜(jing)環(huan)(huan)(huan)(huan)(huan)(huan)通常(chang)固定在(zai)殼體(ti)上，動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)(huan)通過彈(dan)簧、彈(dan)簧座與軸(zhou)(zhou)一(yi)(yi)同旋轉(zhuan)。靜(jing)環(huan)(huan)(huan)(huan)(huan)(huan)與殼體(ti)、動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)(huan)與軸(zhou)(zhou)形成的間隙用(yong)(yong)成型填(tian)(tian)料密(mi)(mi)封(feng)(feng)。在(zai)動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)(huan)和(he)(he)(he)(he)靜(jing)環(huan)(huan)(huan)(huan)(huan)(huan)接(jie)觸的端面形成相對滑動(dong)(dong)(dong)面，即動(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)面。為(wei)保證密(mi)(mi)封(feng)(feng)良好(hao)，動(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)面應十分平直和(he)(he)(he)(he)光(guang)潔。彈(dan)簧力(li)和(he)(he)(he)(he)被密(mi)(mi)封(feng)(feng)的流體(ti)壓力(li)使動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)(huan)貼緊(jin)靜(jing)環(huan)(huan)(huan)(huan)(huan)(huan)。因動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)(huan)與軸(zhou)(zhou)通過彈(dan)簧連接(jie)，動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)(huan)和(he)(he)(he)(he)靜(jing)環(huan)(huan)(huan)(huan)(huan)(huan)間貼合性(xing)受軸(zhou)(zhou)的振(zhen)動(dong)(dong)(dong)和(he)(he)(he)(he)擺(bai)動(dong)(dong)(dong)影響較小。靜(jing)環(huan)(huan)(huan)(huan)(huan)(huan)一(yi)(yi)般常(chang)用(yong)(yong)潤滑性(xing)好(hao)的軟質(zhi)材(cai)(cai)料如(ru)石墨、填(tian)(tian)充聚(ju)四氟乙烯等(deng)，動(dong)(dong)(dong)環(huan)(huan)(huan)(huan)(huan)(huan)多用(yong)(yong)硬質(zhi)合金、陶瓷等(deng)材(cai)(cai)料制(zhi)造(zao)。