熱油泵機械密(mi)封失效的主要(yao)形式表(biao)現為(wei)(wei)：密(mi)封表(biao)面(mian)磨損，當動(dong)環(huan)(huan)(huan)(huan)為(wei)(wei)碳化(hua)(hua)鎢、靜(jing)環(huan)(huan)(huan)(huan)為(wei)(wei)石(shi)墨時(shi)，在(zai)靜(jing)環(huan)(huan)(huan)(huan)表(biao)面(mian)出(chu)(chu)現環(huan)(huan)(huan)(huan)狀溝紋;當動(dong)環(huan)(huan)(huan)(huan)用碳化(hua)(hua)鎢環(huan)(huan)(huan)(huan)熱裝在(zai)不銹鋼環(huan)(huan)(huan)(huan)座上時(shi)，會出(chu)(chu)現碳化(hua)(hua)鎢環(huan)(huan)(huan)(huan)松脫的現象;在(zai)動(dong)環(huan)(huan)(huan)(huan)和軸(zhou)套之間(jian)結水垢，動(dong)環(huan)(huan)(huan)(huan)不能浮(fu)動(dong);動(dong)環(huan)(huan)(huan)(huan)密(mi)封圈(quan)磨損或翻(fan)邊(用4F—V形墊制造時(shi));靜(jing)環(huan)(huan)(huan)(huan)離位等。 其(qi)主要(yao)原因是溫度高(gao)(gao)(gao)。高(gao)(gao)(gao)溫使密(mi)封端面(mian)內(nei)介質汽化(hua)(hua);高(gao)(gao)(gao)溫使石(shi)墨環(huan)(huan)(huan)(huan)性(xing)能下降;高(gao)(gao)(gao)溫使冷卻水結垢;高(gao)(gao)(gao)溫使熱裝的碳化(hua)(hua)鎢環(huan)(huan)(huan)(huan)松脫;由于(yu)溫度高(gao)(gao)(gao)，熱油泵容易抽空，使熱(re)(re)(re)油泵機械密(mi)封(feng)失效的(de)主(zhu)要形式表現(xian)為(wei)：密(mi)封(feng)表面磨(mo)損(sun)，當動(dong)環(huan)為(wei)碳化鎢(wu)(wu)(wu)、靜(jing)環(huan)為(wei)石墨(mo)時(shi)，在靜(jing)環(huan)表面出現(xian)環(huan)狀溝紋;當動(dong)環(huan)用(yong)碳化鎢(wu)(wu)(wu)環(huan)熱(re)(re)(re)裝(zhuang)在不(bu)銹鋼環(huan)座(zuo)上時(shi)，會(hui)出現(xian)碳化鎢(wu)(wu)(wu)環(huan)松脫(tuo)(tuo)的(de)現(xian)象;在動(dong)環(huan)和(he)軸(zhou)套(tao)之間結(jie)水垢(gou)，動(dong)環(huan)不(bu)能(neng)浮動(dong);動(dong)環(huan)密(mi)封(feng)圈磨(mo)損(sun)或翻邊(bian)(用(yong)4F—V形墊制造時(shi));靜(jing)環(huan)離位等。 其(qi)主(zhu)要原因是溫(wen)(wen)度高。高溫(wen)(wen)使(shi)(shi)(shi)密(mi)封(feng)端面內(nei)介質汽化;高溫(wen)(wen)使(shi)(shi)(shi)石墨(mo)環(huan)性(xing)能(neng)下降;高溫(wen)(wen)使(shi)(shi)(shi)冷卻水結(jie)垢(gou);高溫(wen)(wen)使(shi)(shi)(shi)熱(re)(re)(re)裝(zhuang)的(de)碳化鎢(wu)(wu)(wu)環(huan)松脫(tuo)(tuo);由于(yu)溫(wen)(wen)度高，熱(re)(re)(re)油泵容易抽空，使(shi)(shi)(shi)靜(jing)環(huan)離位、動(dong)環(huan)密(mi)封(feng)圈產生翻邊(bian)等缺陷(xian)。有(you)機械雜質存在時(shi)，也會(hui)加劇密(mi)封(feng)面的(de)磨(mo)損(sun)。