熱油泵機械密封(feng)失(shi)效的(de)主要形式表(biao)現(xian)為：密封(feng)表(biao)面磨損，當動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)為碳(tan)化(hua)(hua)(hua)鎢(wu)、靜環(huan)(huan)(huan)為石墨時(shi)，在靜環(huan)(huan)(huan)表(biao)面出(chu)現(xian)環(huan)(huan)(huan)狀溝紋;當動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)用(yong)碳(tan)化(hua)(hua)(hua)鎢(wu)環(huan)(huan)(huan)熱裝在不銹鋼環(huan)(huan)(huan)座上時(shi)，會出(chu)現(xian)碳(tan)化(hua)(hua)(hua)鎢(wu)環(huan)(huan)(huan)松脫的(de)現(xian)象;在動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)和軸套之間結水(shui)垢，動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)不能浮動(dong)(dong)(dong)(dong);動(dong)(dong)(dong)(dong)環(huan)(huan)(huan)密封(feng)圈磨損或翻邊(bian)(用(yong)4F—V形墊制造時(shi));靜環(huan)(huan)(huan)離位等。 其(qi)主要原因(yin)是溫(wen)度高(gao)(gao)(gao)。高(gao)(gao)(gao)溫(wen)使(shi)(shi)密封(feng)端面內介(jie)質汽化(hua)(hua)(hua);高(gao)(gao)(gao)溫(wen)使(shi)(shi)石墨環(huan)(huan)(huan)性(xing)能下降;高(gao)(gao)(gao)溫(wen)使(shi)(shi)冷卻水(shui)結垢;高(gao)(gao)(gao)溫(wen)使(shi)(shi)熱裝的(de)碳(tan)化(hua)(hua)(hua)鎢(wu)環(huan)(huan)(huan)松脫;由于溫(wen)度高(gao)(gao)(gao)，熱油泵容易抽空，使(shi)(shi)熱油泵(beng)機(ji)械密(mi)封失(shi)效的(de)(de)主要(yao)(yao)形式表現為(wei)：密(mi)封表面(mian)磨(mo)損，當動(dong)(dong)環(huan)(huan)(huan)(huan)為(wei)碳(tan)(tan)化(hua)(hua)鎢、靜(jing)(jing)環(huan)(huan)(huan)(huan)為(wei)石(shi)墨時，在(zai)靜(jing)(jing)環(huan)(huan)(huan)(huan)表面(mian)出現環(huan)(huan)(huan)(huan)狀溝紋;當動(dong)(dong)環(huan)(huan)(huan)(huan)用碳(tan)(tan)化(hua)(hua)鎢環(huan)(huan)(huan)(huan)熱裝在(zai)不(bu)銹鋼(gang)環(huan)(huan)(huan)(huan)座(zuo)上時，會出現碳(tan)(tan)化(hua)(hua)鎢環(huan)(huan)(huan)(huan)松(song)脫的(de)(de)現象;在(zai)動(dong)(dong)環(huan)(huan)(huan)(huan)和軸套之(zhi)間(jian)結水垢，動(dong)(dong)環(huan)(huan)(huan)(huan)不(bu)能浮(fu)動(dong)(dong);動(dong)(dong)環(huan)(huan)(huan)(huan)密(mi)封圈(quan)磨(mo)損或翻(fan)邊(bian)(用4F—V形墊(dian)制造時);靜(jing)(jing)環(huan)(huan)(huan)(huan)離位(wei)等(deng)。 其主要(yao)(yao)原因(yin)是溫度高。高溫使密(mi)封端面(mian)內介質(zhi)汽化(hua)(hua);高溫使石(shi)墨環(huan)(huan)(huan)(huan)性能下降;高溫使冷卻水結垢;高溫使熱裝的(de)(de)碳(tan)(tan)化(hua)(hua)鎢環(huan)(huan)(huan)(huan)松(song)脫;由(you)于溫度高，熱油泵(beng)容易抽空，使靜(jing)(jing)環(huan)(huan)(huan)(huan)離位(wei)、動(dong)(dong)環(huan)(huan)(huan)(huan)密(mi)封圈(quan)產生翻(fan)邊(bian)等(deng)缺陷。有機(ji)械雜質(zhi)存在(zai)時，也會加劇密(mi)封面(mian)的(de)(de)磨(mo)損。