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發布時間:2021-12-21 11:48:30 人氣(qi):97126 來源:
1、液壓密封件之形式選擇
在液壓(ya)系(xi)統(tong)中,常見的密封(feng)(feng)形(xing)式有擠(ji)(ji)壓(ya)型O形(xing)密封(feng)(feng)圈(quan)(quan)、Y形(xing)圈(quan)(quan)、V形(xing)圈(quan)(quan)、U形(xing)圈(quan)(quan)唇(chun)形(xing)密封(feng)(feng)。唇(chun)形(xing)密封(feng)(feng)圈(quan)(quan)主(zhu)要用于往(wang)復動密封(feng)(feng),與O形(xing)圈(quan)(quan)等擠(ji)(ji)壓(ya)密封(feng)(feng)相(xiang)比(bi),往(wang)復動密封(feng)(feng)使用唇(chun)形(xing)密封(feng)(feng)圈(quan)(quan)具有更好(hao)的綜合性能和更長的使用壽命。
唇形密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)的(de)(de)(de)密(mi)封(feng)(feng)(feng)(feng)壓(ya)(ya)(ya)(ya)(ya)緊(jin)(jin)力(li)(li)(li)是隨介(jie)質(zhi)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)的(de)(de)(de)改變(bian)而變(bian)化(hua)(hua)的(de)(de)(de),工作中(zhong)始終應監控介(jie)質(zhi)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)的(de)(de)(de)變(bian)化(hua)(hua),即能保(bao)證(zheng)足夠的(de)(de)(de)密(mi)封(feng)(feng)(feng)(feng)壓(ya)(ya)(ya)(ya)(ya)緊(jin)(jin)力(li)(li)(li),又不(bu)(bu)至于產(chan)(chan)(chan)生過(guo)大(da)(da)(da)的(de)(de)(de)摩(mo)擦(ca)力(li)(li)(li),擠壓(ya)(ya)(ya)(ya)(ya)性密(mi)封(feng)(feng)(feng)(feng)主要靠預(yu)壓(ya)(ya)(ya)(ya)(ya)緊(jin)(jin)力(li)(li)(li)產(chan)(chan)(chan)生密(mi)封(feng)(feng)(feng)(feng)力(li)(li)(li),密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)接(jie)(jie)觸(chu)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)預(yu)先給定,工作中(zhong)不(bu)(bu)能根據介(jie)質(zhi)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)的(de)(de)(de)改變(bian)而變(bian)化(hua)(hua)。大(da)(da)(da)的(de)(de)(de)預(yu)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)會使密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)與密(mi)封(feng)(feng)(feng)(feng)面接(jie)(jie)觸(chu)面積(ji)增大(da)(da)(da),產(chan)(chan)(chan)生很大(da)(da)(da)的(de)(de)(de)摩(mo)擦(ca)阻(zu)力(li)(li)(li),過(guo)大(da)(da)(da)的(de)(de)(de)摩(mo)擦(ca)力(li)(li)(li)會造成密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)的(de)(de)(de)破損(sun),在低壓(ya)(ya)(ya)(ya)(ya)時造成啟(qi)動困難,或(huo)產(chan)(chan)(chan)生爬行現象(xiang),唇形密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)可以通(tong)過(guo)唇部撐(cheng)開,變(bian)形補償小的(de)(de)(de)磨損(sun)量,保(bao)證(zheng)密(mi)封(feng)(feng)(feng)(feng)效果和密(mi)封(feng)(feng)(feng)(feng)壽(shou)命;而O形圈(quan)(quan)(quan)隨著摩(mo)擦(ca)余量的(de)(de)(de)減少,直(zhi)接(jie)(jie)影響其密(mi)封(feng)(feng)(feng)(feng)性。
2、液壓(ya)密封件(jian)之(zhi)材料選擇
密(mi)封(feng)(feng)(feng)(feng)件(jian)形式和(he)結構現在一(yi)般(ban)已經定(ding)型(xing),各(ge)密(mi)封(feng)(feng)(feng)(feng)件(jian)質(zhi)(zhi)量區別主要在于制(zhi)作(zuo)材(cai)料上。密(mi)封(feng)(feng)(feng)(feng)材(cai)料主要使(shi)用(yong)橡(xiang)膠和(he)合成樹脂。由于各(ge)種(zhong)材(cai)料性能(neng)(neng)(neng)特點不(bu)(bu)同(tong),性能(neng)(neng)(neng)特點不(bu)(bu)同(tong),用(yong)途也(ye)就(jiu)有(you)(you)(you)(you)(you)(you)所(suo)不(bu)(bu)同(tong)。選用(yong)時需(xu)根據(ju)不(bu)(bu)同(tong)的(de)(de)(de)使(shi)用(yong)條件(jian)和(he)不(bu)(bu)同(tong)的(de)(de)(de)使(shi)用(yong)條件(jian)作(zuo)出合適(shi)的(de)(de)(de)選擇。另(ling)外,某一(yi)材(cai)質(zhi)(zhi)的(de)(de)(de)密(mi)封(feng)(feng)(feng)(feng)對被密(mi)封(feng)(feng)(feng)(feng)的(de)(de)(de)某一(yi)工作(zuo)介質(zhi)(zhi)(如礦物油(you)(you)等)表(biao)現較(jiao)好的(de)(de)(de)密(mi)封(feng)(feng)(feng)(feng)性能(neng)(neng)(neng),而(er)對另(ling)一(yi)介質(zhi)(zhi)表(biao)現極差,這就(jiu)是密(mi)封(feng)(feng)(feng)(feng)材(cai)料與液壓油(you)(you)的(de)(de)(de)相容性。還有(you)(you)(you)(you)(you)(you),各(ge)種(zhong)不(bu)(bu)同(tong)的(de)(de)(de)密(mi)封(feng)(feng)(feng)(feng)材(cai)料對你(ni)不(bu)(bu)同(tong)的(de)(de)(de)工作(zuo)條件(jian)表(biao)現出不(bu)(bu)同(tong)的(de)(de)(de)性能(neng)(neng)(neng)。有(you)(you)(you)(you)(you)(you)些(xie)(xie)耐(nai)熱(re),有(you)(you)(you)(you)(you)(you)些(xie)(xie)不(bu)(bu)耐(nai)熱(re);有(you)(you)(you)(you)(you)(you)些(xie)(xie)耐(nai)酸,有(you)(you)(you)(you)(you)(you)些(xie)(xie)耐(nai)堿,有(you)(you)(you)(you)(you)(you)些(xie)(xie)耐(nai)水,有(you)(you)(you)(you)(you)(you)些(xie)(xie)耐(nai)油(you)(you);有(you)(you)(you)(you)(you)(you)些(xie)(xie)抗熱(re),有(you)(you)(you)(you)(you)(you)些(xie)(xie)耐(nai)低溫,有(you)(you)(you)(you)(you)(you)些(xie)(xie)耐(nai)高溫,等等。這些(xie)(xie)因素在考慮密(mi)封(feng)(feng)(feng)(feng)件(jian)材(cai)料的(de)(de)(de)時候需(xu)注(zhu)意。