1、液壓密封件之形式(shi)選擇

　　在液壓系(xi)統(tong)中，常見(jian)的(de)密(mi)(mi)(mi)封(feng)(feng)(feng)形(xing)(xing)(xing)式有擠壓型O形(xing)(xing)(xing)密(mi)(mi)(mi)封(feng)(feng)(feng)圈(quan)、Y形(xing)(xing)(xing)圈(quan)、V形(xing)(xing)(xing)圈(quan)、U形(xing)(xing)(xing)圈(quan)唇(chun)形(xing)(xing)(xing)密(mi)(mi)(mi)封(feng)(feng)(feng)。唇(chun)形(xing)(xing)(xing)密(mi)(mi)(mi)封(feng)(feng)(feng)圈(quan)主要(yao)用于往復(fu)動密(mi)(mi)(mi)封(feng)(feng)(feng)，與(yu)O形(xing)(xing)(xing)圈(quan)等擠壓密(mi)(mi)(mi)封(feng)(feng)(feng)相比，往復(fu)動密(mi)(mi)(mi)封(feng)(feng)(feng)使用唇(chun)形(xing)(xing)(xing)密(mi)(mi)(mi)封(feng)(feng)(feng)圈(quan)具有更好的(de)綜(zong)合(he)性能和更長的(de)使用壽(shou)命。

　　唇(chun)形密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)圈(quan)的(de)(de)(de)(de)(de)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)壓(ya)(ya)緊力(li)(li)(li)(li)是隨介質壓(ya)(ya)力(li)(li)(li)(li)的(de)(de)(de)(de)(de)改(gai)變(bian)(bian)(bian)而(er)變(bian)(bian)(bian)化(hua)(hua)的(de)(de)(de)(de)(de)，工作中始終(zhong)應監控介質壓(ya)(ya)力(li)(li)(li)(li)的(de)(de)(de)(de)(de)變(bian)(bian)(bian)化(hua)(hua)，即(ji)能保(bao)證(zheng)足(zu)夠的(de)(de)(de)(de)(de)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)壓(ya)(ya)緊力(li)(li)(li)(li)，又不至于產(chan)生過大(da)(da)的(de)(de)(de)(de)(de)摩擦力(li)(li)(li)(li)，擠(ji)壓(ya)(ya)性密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)主要靠預壓(ya)(ya)緊力(li)(li)(li)(li)產(chan)生密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)力(li)(li)(li)(li)，密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)圈(quan)接觸壓(ya)(ya)力(li)(li)(li)(li)預先給(gei)定，工作中不能根據介質壓(ya)(ya)力(li)(li)(li)(li)的(de)(de)(de)(de)(de)改(gai)變(bian)(bian)(bian)而(er)變(bian)(bian)(bian)化(hua)(hua)。大(da)(da)的(de)(de)(de)(de)(de)預壓(ya)(ya)力(li)(li)(li)(li)會使密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)圈(quan)與(yu)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)面接觸面積增(zeng)大(da)(da)，產(chan)生很大(da)(da)的(de)(de)(de)(de)(de)摩擦阻力(li)(li)(li)(li)，過大(da)(da)的(de)(de)(de)(de)(de)摩擦力(li)(li)(li)(li)會造(zao)成(cheng)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)圈(quan)的(de)(de)(de)(de)(de)破損，在低壓(ya)(ya)時造(zao)成(cheng)啟動(dong)困難，或(huo)產(chan)生爬行現象(xiang)，唇(chun)形密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)圈(quan)可以(yi)通(tong)過唇(chun)部(bu)撐(cheng)開(kai)，變(bian)(bian)(bian)形補(bu)償(chang)小的(de)(de)(de)(de)(de)磨(mo)損量，保(bao)證(zheng)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)效果和密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)壽(shou)命;而(er)O形圈(quan)隨著摩擦余量的(de)(de)(de)(de)(de)減少(shao)，直接影響其密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)性。

　　2、液(ye)壓密封件之材料選擇

　　密封(feng)(feng)件(jian)(jian)形(xing)式和結構(gou)現在一(yi)般已經定型(xing)，各(ge)密封(feng)(feng)件(jian)(jian)質(zhi)量區別主(zhu)要在于制作材(cai)(cai)料(liao)(liao)上。密封(feng)(feng)材(cai)(cai)料(liao)(liao)主(zhu)要使用(yong)橡膠和合成樹脂。由于各(ge)種(zhong)材(cai)(cai)料(liao)(liao)性(xing)能(neng)特(te)點不(bu)同(tong)(tong)(tong)，性(xing)能(neng)特(te)點不(bu)同(tong)(tong)(tong)，用(yong)途也(ye)就有(you)所(suo)不(bu)同(tong)(tong)(tong)。選用(yong)時需根據不(bu)同(tong)(tong)(tong)的(de)(de)(de)使用(yong)條件(jian)(jian)和不(bu)同(tong)(tong)(tong)的(de)(de)(de)使用(yong)條件(jian)(jian)作出合適的(de)(de)(de)選擇。另外，某一(yi)材(cai)(cai)質(zhi)的(de)(de)(de)密封(feng)(feng)對(dui)被密封(feng)(feng)的(de)(de)(de)某一(yi)工(gong)作介質(zhi)(如(ru)礦(kuang)物油(you)等)表現較(jiao)好的(de)(de)(de)密封(feng)(feng)性(xing)能(neng)，而對(dui)另一(yi)介質(zhi)表現極(ji)差，這(zhe)就是密封(feng)(feng)材(cai)(cai)料(liao)(liao)與液壓(ya)油(you)的(de)(de)(de)相容性(xing)。還有(you)，各(ge)種(zhong)不(bu)同(tong)(tong)(tong)的(de)(de)(de)密封(feng)(feng)材(cai)(cai)料(liao)(liao)對(dui)你(ni)不(bu)同(tong)(tong)(tong)的(de)(de)(de)工(gong)作條件(jian)(jian)表現出不(bu)同(tong)(tong)(tong)的(de)(de)(de)性(xing)能(neng)。有(you)些(xie)耐(nai)(nai)熱，有(you)些(xie)不(bu)耐(nai)(nai)熱;有(you)些(xie)耐(nai)(nai)酸，有(you)些(xie)耐(nai)(nai)堿，有(you)些(xie)耐(nai)(nai)水，有(you)些(xie)耐(nai)(nai)油(you);有(you)些(xie)抗熱，有(you)些(xie)耐(nai)(nai)低溫(wen)，有(you)些(xie)耐(nai)(nai)高溫(wen)，等等。這(zhe)些(xie)因素在考慮密封(feng)(feng)件(jian)(jian)材(cai)(cai)料(liao)(liao)的(de)(de)(de)時候(hou)需注意。