熱(re)油泵機械密(mi)(mi)封(feng)失效的主要形式表現(xian)(xian)為(wei)：密(mi)(mi)封(feng)表面(mian)(mian)磨損(sun)，當動(dong)(dong)環(huan)(huan)(huan)為(wei)碳(tan)化鎢(wu)(wu)、靜環(huan)(huan)(huan)為(wei)石墨(mo)(mo)時(shi)，在(zai)靜環(huan)(huan)(huan)表面(mian)(mian)出(chu)現(xian)(xian)環(huan)(huan)(huan)狀溝紋;當動(dong)(dong)環(huan)(huan)(huan)用(yong)碳(tan)化鎢(wu)(wu)環(huan)(huan)(huan)熱(re)裝(zhuang)在(zai)不銹鋼環(huan)(huan)(huan)座上時(shi)，會出(chu)現(xian)(xian)碳(tan)化鎢(wu)(wu)環(huan)(huan)(huan)松脫(tuo)(tuo)的現(xian)(xian)象;在(zai)動(dong)(dong)環(huan)(huan)(huan)和軸套之(zhi)間結(jie)水垢(gou)，動(dong)(dong)環(huan)(huan)(huan)不能(neng)浮動(dong)(dong);動(dong)(dong)環(huan)(huan)(huan)密(mi)(mi)封(feng)圈磨損(sun)或翻(fan)邊(用(yong)4F—V形墊制(zhi)造時(shi));靜環(huan)(huan)(huan)離位等。 其主要原因(yin)是溫(wen)度(du)高。高溫(wen)使(shi)密(mi)(mi)封(feng)端面(mian)(mian)內介質(zhi)汽化;高溫(wen)使(shi)石墨(mo)(mo)環(huan)(huan)(huan)性能(neng)下降;高溫(wen)使(shi)冷卻水結(jie)垢(gou);高溫(wen)使(shi)熱(re)裝(zhuang)的碳(tan)化鎢(wu)(wu)環(huan)(huan)(huan)松脫(tuo)(tuo);由于溫(wen)度(du)高，熱(re)油泵容易抽空，使(shi)熱(re)(re)油泵機械密(mi)封失效的主要形(xing)(xing)式表現(xian)(xian)為：密(mi)封表面磨損(sun)(sun)，當動環(huan)(huan)(huan)(huan)為碳(tan)化鎢(wu)、靜環(huan)(huan)(huan)(huan)為石墨時，在(zai)靜環(huan)(huan)(huan)(huan)表面出現(xian)(xian)環(huan)(huan)(huan)(huan)狀溝紋;當動環(huan)(huan)(huan)(huan)用碳(tan)化鎢(wu)環(huan)(huan)(huan)(huan)熱(re)(re)裝(zhuang)在(zai)不銹鋼環(huan)(huan)(huan)(huan)座(zuo)上時，會出現(xian)(xian)碳(tan)化鎢(wu)環(huan)(huan)(huan)(huan)松(song)脫的現(xian)(xian)象;在(zai)動環(huan)(huan)(huan)(huan)和軸(zhou)套(tao)之間結水(shui)垢，動環(huan)(huan)(huan)(huan)不能(neng)浮動;動環(huan)(huan)(huan)(huan)密(mi)封圈(quan)磨損(sun)(sun)或(huo)翻(fan)邊(bian)(用4F—V形(xing)(xing)墊制造(zao)時);靜環(huan)(huan)(huan)(huan)離位等。 其主要原因是溫(wen)度(du)高(gao)(gao)。高(gao)(gao)溫(wen)使(shi)(shi)密(mi)封端(duan)面內(nei)介質汽化;高(gao)(gao)溫(wen)使(shi)(shi)石墨環(huan)(huan)(huan)(huan)性能(neng)下(xia)降;高(gao)(gao)溫(wen)使(shi)(shi)冷卻水(shui)結垢;高(gao)(gao)溫(wen)使(shi)(shi)熱(re)(re)裝(zhuang)的碳(tan)化鎢(wu)環(huan)(huan)(huan)(huan)松(song)脫;由于(yu)溫(wen)度(du)高(gao)(gao)，熱(re)(re)油泵容易(yi)抽空(kong)，使(shi)(shi)靜環(huan)(huan)(huan)(huan)離位、動環(huan)(huan)(huan)(huan)密(mi)封圈(quan)產(chan)生翻(fan)邊(bian)等缺陷。有機械雜質存在(zai)時，也(ye)會加(jia)劇密(mi)封面的磨損(sun)(sun)。