離(li)心(xin)泵(beng)停機(ji)主要(yao)是由(you)機(ji)械密封的失(shi)(shi)效(xiao)造成(cheng)的，造成(cheng)機(ji)械密封失(shi)(shi)效(xiao)的原因有很多。

機(ji)械密封(feng)(feng)(feng)元件(jian)失(shi)效多的(de)部(bu)位是動，靜環(huan)的(de)端(duan)(duan)面(mian)(mian)(mian)，離心泵機(ji)封(feng)(feng)(feng)動，靜環(huan)端(duan)(duan)面(mian)(mian)(mian)出現(xian)龜(gui)裂是常見的(de)失(shi)效現(xian)象，其失(shi)效的(de)原因(yin)(yin)有(you)許多，主(zhu)要原因(yin)(yin)有(you)以下幾(ji)點：第(di)一(yi)(yi)安裝時(shi)密封(feng)(feng)(feng)面(mian)(mian)(mian)間隙(xi)過(guo)大，沖洗(xi)液來(lai)不及帶走(zou)摩擦副產生(sheng)的(de)熱(re)量；沖洗(xi)液從(cong)密封(feng)(feng)(feng)面(mian)(mian)(mian)間隙(xi)中(zhong)(zhong)漏(lou)走(zou)，造成(cheng)(cheng)(cheng)端(duan)(duan)面(mian)(mian)(mian)過(guo)熱(re)而損壞；第(di)二液體介(jie)質汽化(hua)膨(peng)脹，使兩(liang)端(duan)(duan)面(mian)(mian)(mian)受汽化(hua)膨(peng)脹力而分(fen)開，當兩(liang)密封(feng)(feng)(feng)面(mian)(mian)(mian)用力貼合時(shi)，破壞潤滑(hua)膜從(cong)而造成(cheng)(cheng)(cheng)端(duan)(duan)面(mian)(mian)(mian)表面(mian)(mian)(mian)過(guo)熱(re)；第(di)三液體介(jie)質潤滑(hua)性較差，加(jia)之(zhi)操(cao)作壓力過(guo)載(zai)，兩(liang)密封(feng)(feng)(feng)面(mian)(mian)(mian)跟蹤轉(zhuan)(zhuan)動不同步。例(li)如高轉(zhuan)(zhuan)速(su)泵轉(zhuan)(zhuan)速(su)為20445r/min，密封(feng)(feng)(feng)面(mian)(mian)(mian)中(zhong)(zhong)心直徑為7cm，泵運轉(zhuan)(zhuan)后其線速(su)度(du)高達75 m/s，當有(you)一(yi)(yi)個密封(feng)(feng)(feng)面(mian)(mian)(mian)滯后不能(neng)跟蹤旋轉(zhuan)(zhuan)，瞬(shun)時(shi)高溫造成(cheng)(cheng)(cheng)密封(feng)(feng)(feng)面(mian)(mian)(mian)損壞；第(di)四密封(feng)(feng)(feng)沖洗(xi)液孔板(ban)或過(guo)濾(lv)網堵塞，造成(cheng)(cheng)(cheng)水(shui)量不足，使機(ji)封(feng)(feng)(feng)失(shi)效。

另外，密封(feng)面(mian)(mian)表面(mian)(mian)滑溝，端面(mian)(mian)貼合時(shi)出現缺口導致(zhi)密封(feng)元(yuan)件失(shi)效(xiao)，導致(zhi)失(shi)效(xiao)主要原因以(yi)下三點：1.液體介質不(bu)清潔，有微小質硬的顆粒，以(yi)很高的速度滑人密封(feng)面(mian)(mian)，將端面(mian)(mian)表面(mian)(mian)劃傷(shang)而(er)失(shi)效(xiao)；2.機泵(beng)傳(chuan)動件同(tong)軸度差，泵(beng)開啟后每轉一周端面(mian)(mian)被晃動摩擦一次，動環運行軌跡(ji)不(bu)同(tong)心，造成端面(mian)(mian)汽化，過熱磨損；3.液體介質水力特性(xing)的頻繁發(fa)生引起泵(beng)組(zu)振動，造成密封(feng)面(mian)(mian)錯(cuo)位而(er)失(shi)效(xiao)。