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發(fa)布時間:2021-05-18 16:44:01 人氣:332780 來源:
康縣機械密封的(de)大部(bu)(bu)分主要特(te)征是自動(dong)界面(mian)(mian)(mian)潤(run)滑(hua)機制,該(gai)機制控制密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)功能、摩擦、磨(mo)損和(he)(he)壽命。一(yi)切取(qu)(qu)決(jue)于(yu)(yu)(yu)(yu)液體(ti)通(tong)過(guo)界面(mian)(mian)(mian)并建立潤(run)滑(hua)膜,使(shi)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)在實(shi)際非(fei)接(jie)觸(chu)條件下(通(tong)常是混合(he)摩擦,干摩擦和(he)(he)完全(quan)液膜之(zhi)間(jian)(jian)的(de)潤(run)滑(hua)摩擦狀態)運(yun)行。在腔(qiang)體(ti)的(de)壓(ya)(ya)(ya)(ya)(ya)力(li)下,介(jie)質(zhi)(zhi)通(tong)過(guo)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)摩擦副的(de)端(duan)面(mian)(mian)(mian);此時(shi)(shi)表面(mian)(mian)(mian)張力(li)和(he)(he)離心力(li)影(ying)響(xiang)不大。當(dang)流體(ti)徑向(xiang)流過(guo)端(duan)面(mian)(mian)(mian)時(shi)(shi),流體(ti)壓(ya)(ya)(ya)(ya)(ya)力(li)繼續下降,直(zhi)到達到外部(bu)(bu)背壓(ya)(ya)(ya)(ya)(ya)(通(tong)常為大氣(qi)壓(ya)(ya)(ya)(ya)(ya)力(li)),這(zhe)類(lei)似于(yu)(yu)(yu)(yu)靜壓(ya)(ya)(ya)(ya)(ya)軸承(cheng)(cheng)(cheng)(cheng)的(de)軸承(cheng)(cheng)(cheng)(cheng)功能。密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)件的(de)承(cheng)(cheng)(cheng)(cheng)載(zai)能力(li)取(qu)(qu)決(jue)于(yu)(yu)(yu)(yu)壓(ya)(ya)(ya)(ya)(ya)差和(he)(he)界面(mian)(mian)(mian)間(jian)(jian)隙的(de)形狀變(bian)化,數學分析復雜。當(dang)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)旋轉時(shi)(shi),端(duan)面(mian)(mian)(mian)內的(de)剪切流與(yu)端(duan)面(mian)(mian)(mian)剩余高度的(de)變(bian)化相(xiang)互作(zuo)用,產(chan)生動(dong)壓(ya)(ya)(ya)(ya)(ya),與(yu)動(dong)壓(ya)(ya)(ya)(ya)(ya)軸承(cheng)(cheng)(cheng)(cheng)具有相(xiang)似的(de)承(cheng)(cheng)(cheng)(cheng)載(zai)功能,并取(qu)(qu)決(jue)于(yu)(yu)(yu)(yu)介(jie)質(zhi)(zhi)粘(zhan)度、轉速和(he)(he)端(duan)面(mian)(mian)(mian)間(jian)(jian)隙的(de)變(bian)化。正常情況下,動(dong)水(shui)壓(ya)(ya)(ya)(ya)(ya)力(li)場(chang)和(he)(he)靜水(shui)壓(ya)(ya)(ya)(ya)(ya)力(li)場(chang)構成了運(yun)行中密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)件的(de)承(cheng)(cheng)(cheng)(cheng)載(zai)能力(li),屬于(yu)(yu)(yu)(yu)開啟力(li)部(bu)(bu)分,用于(yu)(yu)(yu)(yu)防止密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)件剛性接(jie)觸(chu)。
康縣機械密封是一種高精(jing)度(du)的機械部(bu)件,其正確安(an)裝和操作(zuo)對其使(shi)用(yong)壽命有(you)很(hen)大影響。所以我們來看看安(an)裝時的注意事(shi)項。
1.安裝時注意平衡(heng)和對稱
將密(mi)(mi)封(feng)(feng)件放在靠近有效密(mi)(mi)封(feng)(feng)面(或唇線)的位(wei)置。硬密(mi)(mi)封(feng)(feng)球閥投入使用(yong)后(hou)(hou),需要做好進一步的觀察(cha)和緊固密(mi)(mi)封(feng)(feng)的善(shan)后(hou)(hou)工(gong)作,以防止系(xi)統運行過程(cheng)中因工(gong)況(kuang)變化(如增壓(ya))造(zao)成微泄漏而導致(zhi)的崩潰。
2.不(bu)要強(qiang)行安裝
有(you)些密封(feng)(feng)(feng)件(jian)放在(zai)槽形填料函(han)中,需要(yao)安裝(zhuang)牢固,施工時不應粗糙野蠻(man)。大(da)作用的強制(zhi)加載必然會(hui)破壞密封(feng)(feng)(feng)件(jian)原有(you)的預制(zhi)結構,就(jiu)像(xiang)打碎預制(zhi)混(hun)凝土并填充(chong)到所需部位必然會(hui)導致災難。這類密封(feng)(feng)(feng)件(jian)的安裝(zhuang)一(yi)定要(yao)非(fei)常小心謹慎,埋設一(yi)定要(yao)循序漸進;
3.不(bu)要損壞密封(feng)表面(mian)或密封(feng)表面(mian)上的密封(feng)線
平面密(mi)封(feng)(feng)的(de)(de)(de)(de)密(mi)封(feng)(feng)性(xing)能取(qu)決(jue)于上(shang)下(xia)(xia)端面;液(ye)壓密(mi)封(feng)(feng)件(jian)的(de)(de)(de)(de)密(mi)封(feng)(feng)性(xing)能取(qu)決(jue)于與孔(kong)或(huo)軸(zhou)相關的(de)(de)(de)(de)唇線。這些零(ling)件(jian)由石墨、橡膠、塑料、纖維(wei)等柔軟有彈性(xing)的(de)(de)(de)(de)特殊材(cai)料制成,容(rong)易(yi)損(sun)壞(huai)。因此,在(zai)運輸、安裝和儲存過程中(zhong),更需要給予特殊的(de)(de)(de)(de)保護和照顧。一旦損(sun)壞(huai),往往會(hui)給密(mi)封(feng)(feng)部件(jian)留下(xia)(xia)很大的(de)(de)(de)(de)隱患;
4.組件的確認
將康縣機械密封安(an)裝(zhuang)到機器上時(shi),在(zai)安(an)裝(zhuang)前與總裝(zhuang)配(pei)圖進(jin)行良好(hao)的比較(jiao),以(yi)確(que)認(ren)零件是(shi)否準備齊全。此(ci)時(shi),注(zhu)意(yi)密(mi)(mi)封(feng)摩擦副的密(mi)(mi)封(feng)面和(he)密(mi)(mi)封(feng)圈(quan)是(shi)否有傷痕、缺陷等異常現象(xiang),也要注(zhu)意(yi)與填料(liao)和(he)密(mi)(mi)封(feng)圈(quan)(O型圈(quan))接觸的軸(zhou)或軸(zhou)套表面和(he)法蘭是(shi)否有傷痕。如果發(fa)現任(ren)何(he)異常現象(xiang),必須(xu)在(zai)使(shi)用前更(geng)換或修理。