熱(re)(re)油泵(beng)機械密(mi)封(feng)(feng)失(shi)效的主(zhu)要形式表現(xian)為(wei)：密(mi)封(feng)(feng)表面(mian)(mian)磨損，當(dang)動環(huan)(huan)(huan)為(wei)碳(tan)化(hua)鎢(wu)、靜(jing)環(huan)(huan)(huan)為(wei)石墨時，在(zai)靜(jing)環(huan)(huan)(huan)表面(mian)(mian)出現(xian)環(huan)(huan)(huan)狀溝紋(wen);當(dang)動環(huan)(huan)(huan)用(yong)碳(tan)化(hua)鎢(wu)環(huan)(huan)(huan)熱(re)(re)裝在(zai)不(bu)銹鋼環(huan)(huan)(huan)座上(shang)時，會出現(xian)碳(tan)化(hua)鎢(wu)環(huan)(huan)(huan)松脫(tuo)的現(xian)象(xiang);在(zai)動環(huan)(huan)(huan)和軸(zhou)套之間(jian)結水垢，動環(huan)(huan)(huan)不(bu)能浮動;動環(huan)(huan)(huan)密(mi)封(feng)(feng)圈(quan)磨損或翻邊(用(yong)4F—V形墊制造時);靜(jing)環(huan)(huan)(huan)離(li)位等。 其主(zhu)要原因是溫(wen)度高(gao)。高(gao)溫(wen)使密(mi)封(feng)(feng)端面(mian)(mian)內(nei)介質汽(qi)化(hua);高(gao)溫(wen)使石墨環(huan)(huan)(huan)性(xing)能下降;高(gao)溫(wen)使冷卻水結垢;高(gao)溫(wen)使熱(re)(re)裝的碳(tan)化(hua)鎢(wu)環(huan)(huan)(huan)松脫(tuo);由于溫(wen)度高(gao)，熱(re)(re)油泵(beng)容易(yi)抽空，使熱(re)油(you)泵機(ji)(ji)械(xie)密(mi)(mi)(mi)封(feng)失效的(de)(de)主要(yao)形式(shi)表現(xian)(xian)為：密(mi)(mi)(mi)封(feng)表面(mian)(mian)磨(mo)(mo)損(sun)，當(dang)動(dong)環(huan)(huan)為碳(tan)化(hua)鎢(wu)(wu)、靜(jing)環(huan)(huan)為石(shi)墨時，在(zai)靜(jing)環(huan)(huan)表面(mian)(mian)出(chu)現(xian)(xian)環(huan)(huan)狀溝紋(wen);當(dang)動(dong)環(huan)(huan)用(yong)碳(tan)化(hua)鎢(wu)(wu)環(huan)(huan)熱(re)裝(zhuang)在(zai)不銹鋼(gang)環(huan)(huan)座上時，會(hui)出(chu)現(xian)(xian)碳(tan)化(hua)鎢(wu)(wu)環(huan)(huan)松(song)脫的(de)(de)現(xian)(xian)象;在(zai)動(dong)環(huan)(huan)和軸套之間(jian)結水垢，動(dong)環(huan)(huan)不能浮動(dong);動(dong)環(huan)(huan)密(mi)(mi)(mi)封(feng)圈磨(mo)(mo)損(sun)或翻邊(bian)(用(yong)4F—V形墊制造時);靜(jing)環(huan)(huan)離位(wei)等。 其主要(yao)原因是(shi)溫(wen)度高(gao)(gao)。高(gao)(gao)溫(wen)使(shi)密(mi)(mi)(mi)封(feng)端面(mian)(mian)內介質(zhi)(zhi)汽化(hua);高(gao)(gao)溫(wen)使(shi)石(shi)墨環(huan)(huan)性能下降;高(gao)(gao)溫(wen)使(shi)冷(leng)卻水結垢;高(gao)(gao)溫(wen)使(shi)熱(re)裝(zhuang)的(de)(de)碳(tan)化(hua)鎢(wu)(wu)環(huan)(huan)松(song)脫;由于溫(wen)度高(gao)(gao)，熱(re)油(you)泵容易抽空，使(shi)靜(jing)環(huan)(huan)離位(wei)、動(dong)環(huan)(huan)密(mi)(mi)(mi)封(feng)圈產(chan)生翻邊(bian)等缺陷。有機(ji)(ji)械(xie)雜質(zhi)(zhi)存在(zai)時，也會(hui)加劇密(mi)(mi)(mi)封(feng)面(mian)(mian)的(de)(de)磨(mo)(mo)損(sun)。