離心泵(beng)停機主要是由機械(xie)密(mi)封(feng)(feng)的失效(xiao)造(zao)成的，造(zao)成機械(xie)密(mi)封(feng)(feng)失效(xiao)的原因(yin)有(you)很(hen)多。

機械密(mi)(mi)封(feng)元件失(shi)效(xiao)(xiao)多的部(bu)位(wei)是(shi)動，靜環的端(duan)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)，離(li)心泵(beng)(beng)機封(feng)動，靜環端(duan)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)出現龜裂是(shi)常見的失(shi)效(xiao)(xiao)現象，其失(shi)效(xiao)(xiao)的原因有許多，主要(yao)原因有以(yi)下幾點(dian)：第(di)(di)一安(an)裝時密(mi)(mi)封(feng)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)間(jian)隙過(guo)(guo)大，沖洗(xi)液(ye)(ye)(ye)來不(bu)及帶走摩擦副產生(sheng)的熱量；沖洗(xi)液(ye)(ye)(ye)從密(mi)(mi)封(feng)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)間(jian)隙中漏走，造成端(duan)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)過(guo)(guo)熱而損壞(huai)；第(di)(di)二(er)液(ye)(ye)(ye)體(ti)(ti)介質汽化膨(peng)脹，使(shi)兩(liang)(liang)端(duan)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)受汽化膨(peng)脹力(li)(li)而分開(kai)，當兩(liang)(liang)密(mi)(mi)封(feng)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)用力(li)(li)貼合時，破壞(huai)潤滑膜(mo)從而造成端(duan)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)表面(mian)(mian)(mian)(mian)(mian)(mian)(mian)過(guo)(guo)熱；第(di)(di)三液(ye)(ye)(ye)體(ti)(ti)介質潤滑性(xing)較(jiao)差，加之操作(zuo)壓力(li)(li)過(guo)(guo)載，兩(liang)(liang)密(mi)(mi)封(feng)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)跟(gen)蹤轉動不(bu)同步(bu)。例如(ru)高(gao)轉速泵(beng)(beng)轉速為20445r/min，密(mi)(mi)封(feng)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)中心直徑為7cm，泵(beng)(beng)運轉后其線(xian)速度高(gao)達75 m/s，當有一個密(mi)(mi)封(feng)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)滯后不(bu)能跟(gen)蹤旋轉，瞬時高(gao)溫造成密(mi)(mi)封(feng)面(mian)(mian)(mian)(mian)(mian)(mian)(mian)損壞(huai)；第(di)(di)四密(mi)(mi)封(feng)沖洗(xi)液(ye)(ye)(ye)孔板或過(guo)(guo)濾網(wang)堵塞，造成水量不(bu)足，使(shi)機封(feng)失(shi)效(xiao)(xiao)。

另外(wai)，密(mi)封面表面滑溝，端面貼合(he)時出現缺口導致(zhi)密(mi)封元件失(shi)效(xiao)(xiao)，導致(zhi)失(shi)效(xiao)(xiao)主(zhu)要原因(yin)以下三點：1.液體介質不清(qing)潔，有微小質硬的(de)(de)顆粒(li)，以很高的(de)(de)速(su)度(du)滑人密(mi)封面，將(jiang)端面表面劃傷而(er)失(shi)效(xiao)(xiao)；2.機泵傳動(dong)(dong)件同(tong)軸度(du)差，泵開(kai)啟后每轉一(yi)周端面被(bei)晃動(dong)(dong)摩擦一(yi)次，動(dong)(dong)環運行(xing)軌(gui)跡不同(tong)心，造成端面汽化，過熱(re)磨(mo)損；3.液體介質水力特性的(de)(de)頻繁發生引起泵組振動(dong)(dong)，造成密(mi)封面錯位而(er)失(shi)效(xiao)(xiao)。