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。渣漿泵用南華機械密封的工作原理要求南華機械密封內部無任何雜質，在組裝南華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南華機械密封嚴重漏泄。必要(yao)時可以制作工(gong)裝在(zai)組裝前(qian)水(shui)壓試驗，檢查(cha)動靜環座是(shi)否(fou)存(cun)在(zai)影響密封的缺陷(xian)。

　　渣漿南華泵用南華機械密封由于密封面變形所引起的，而且南華機械密封面泄漏的概率是很高的。如果泵在啟動時就發生南華泵用南華機械密封泄漏，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南華機械密封的變(bian)形情(qing)況。如(ru)果(guo)發生(sheng)變(bian)形，用(yong)平晶檢(jian)查密封(feng)(feng)面的干涉帶的變(bian)化情(qing)況，密封(feng)(feng)面變(bian)形存在于動(dong)環和靜環之(zhi)間。

　　壓缸體(ti)(ti)動(dong)(dong)(dong)(dong)態密封(feng)系(xi)統采用的是主密封(feng)設(she)計(ji)，一般都用U型密封(feng)圈(quan)。液壓缸體(ti)(ti)的往(wang)復(fu)式動(dong)(dong)(dong)(dong)態密封(feng)系(xi)統的設(she)計(ji)，開(kai)始(shi)使用了(le)更加復(fu)雜的U型圈(quan)和(he)同(tong)軸(zhou)(zhou)密封(feng)組件的復(fu)合(he)式設(she)計(ji)。密封(feng)的靜(jing)環(huan)(huan)(huan)通(tong)常固定在殼(ke)體(ti)(ti)上(shang)，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)通(tong)過彈簧(huang)、彈簧(huang)座與軸(zhou)(zhou)一同(tong)旋轉。靜(jing)環(huan)(huan)(huan)與殼(ke)體(ti)(ti)、動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)與軸(zhou)(zhou)形(xing)成(cheng)的間隙(xi)用成(cheng)型填(tian)料密封(feng)。在動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和(he)靜(jing)環(huan)(huan)(huan)接(jie)觸的端面(mian)(mian)形(xing)成(cheng)相(xiang)對滑(hua)動(dong)(dong)(dong)(dong)面(mian)(mian)，即動(dong)(dong)(dong)(dong)密封(feng)面(mian)(mian)。為保證密封(feng)良好，動(dong)(dong)(dong)(dong)密封(feng)面(mian)(mian)應十分平(ping)直和(he)光潔(jie)。彈簧(huang)力和(he)被密封(feng)的流體(ti)(ti)壓力使動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)貼緊(jin)靜(jing)環(huan)(huan)(huan)。因動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)與軸(zhou)(zhou)通(tong)過彈簧(huang)連接(jie)，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和(he)靜(jing)環(huan)(huan)(huan)間貼合(he)性受軸(zhou)(zhou)的振動(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)影(ying)響(xiang)較(jiao)小。靜(jing)環(huan)(huan)(huan)一般常用潤滑(hua)性好的軟(ruan)質材(cai)料如石墨、填(tian)充聚(ju)四氟乙烯等，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)多(duo)用硬質合(he)金、陶瓷等材(cai)料制造。