1、液壓密(mi)封件之形式選(xuan)擇

　　在液壓系統中，常見的密(mi)封(feng)(feng)(feng)形(xing)式有擠壓型O形(xing)密(mi)封(feng)(feng)(feng)圈(quan)(quan)(quan)、Y形(xing)圈(quan)(quan)(quan)、V形(xing)圈(quan)(quan)(quan)、U形(xing)圈(quan)(quan)(quan)唇(chun)形(xing)密(mi)封(feng)(feng)(feng)。唇(chun)形(xing)密(mi)封(feng)(feng)(feng)圈(quan)(quan)(quan)主要用于往(wang)復動密(mi)封(feng)(feng)(feng)，與O形(xing)圈(quan)(quan)(quan)等(deng)擠壓密(mi)封(feng)(feng)(feng)相比，往(wang)復動密(mi)封(feng)(feng)(feng)使用唇(chun)形(xing)密(mi)封(feng)(feng)(feng)圈(quan)(quan)(quan)具有更(geng)好的綜合性(xing)能和更(geng)長(chang)的使用壽命(ming)。

　　唇(chun)(chun)形(xing)密(mi)(mi)封(feng)(feng)(feng)圈(quan)的(de)(de)密(mi)(mi)封(feng)(feng)(feng)壓(ya)緊力(li)(li)是(shi)隨介質壓(ya)力(li)(li)的(de)(de)改變(bian)(bian)(bian)而變(bian)(bian)(bian)化的(de)(de)，工(gong)作中(zhong)始終應監控介質壓(ya)力(li)(li)的(de)(de)變(bian)(bian)(bian)化，即能保證足夠的(de)(de)密(mi)(mi)封(feng)(feng)(feng)壓(ya)緊力(li)(li)，又不(bu)(bu)至于產(chan)生(sheng)(sheng)過(guo)大(da)的(de)(de)摩(mo)擦力(li)(li)，擠壓(ya)性密(mi)(mi)封(feng)(feng)(feng)主要靠預(yu)(yu)壓(ya)緊力(li)(li)產(chan)生(sheng)(sheng)密(mi)(mi)封(feng)(feng)(feng)力(li)(li)，密(mi)(mi)封(feng)(feng)(feng)圈(quan)接(jie)觸(chu)壓(ya)力(li)(li)預(yu)(yu)先給定，工(gong)作中(zhong)不(bu)(bu)能根(gen)據介質壓(ya)力(li)(li)的(de)(de)改變(bian)(bian)(bian)而變(bian)(bian)(bian)化。大(da)的(de)(de)預(yu)(yu)壓(ya)力(li)(li)會使密(mi)(mi)封(feng)(feng)(feng)圈(quan)與密(mi)(mi)封(feng)(feng)(feng)面(mian)接(jie)觸(chu)面(mian)積增大(da)，產(chan)生(sheng)(sheng)很大(da)的(de)(de)摩(mo)擦阻(zu)力(li)(li)，過(guo)大(da)的(de)(de)摩(mo)擦力(li)(li)會造成密(mi)(mi)封(feng)(feng)(feng)圈(quan)的(de)(de)破損(sun)(sun)，在低(di)壓(ya)時造成啟動困難，或產(chan)生(sheng)(sheng)爬行(xing)現(xian)象，唇(chun)(chun)形(xing)密(mi)(mi)封(feng)(feng)(feng)圈(quan)可以通過(guo)唇(chun)(chun)部撐開，變(bian)(bian)(bian)形(xing)補償小的(de)(de)磨損(sun)(sun)量(liang)，保證密(mi)(mi)封(feng)(feng)(feng)效果和密(mi)(mi)封(feng)(feng)(feng)壽命;而O形(xing)圈(quan)隨著摩(mo)擦余量(liang)的(de)(de)減少，直接(jie)影響其密(mi)(mi)封(feng)(feng)(feng)性。

　　2、液壓密封件之材料選(xuan)擇

　　密(mi)封件(jian)(jian)(jian)形式和結構現(xian)在一(yi)(yi)(yi)般已經定(ding)型，各密(mi)封件(jian)(jian)(jian)質(zhi)量區(qu)別主要(yao)在于制作(zuo)(zuo)材(cai)(cai)(cai)料上。密(mi)封材(cai)(cai)(cai)料主要(yao)使用(yong)橡膠和合(he)成樹(shu)脂(zhi)。由于各種材(cai)(cai)(cai)料性能特點不(bu)(bu)(bu)同(tong)(tong)(tong)，性能特點不(bu)(bu)(bu)同(tong)(tong)(tong)，用(yong)途也就有(you)(you)(you)所不(bu)(bu)(bu)同(tong)(tong)(tong)。選用(yong)時需根(gen)據不(bu)(bu)(bu)同(tong)(tong)(tong)的(de)使用(yong)條(tiao)件(jian)(jian)(jian)和不(bu)(bu)(bu)同(tong)(tong)(tong)的(de)使用(yong)條(tiao)件(jian)(jian)(jian)作(zuo)(zuo)出合(he)適的(de)選擇。另外，某一(yi)(yi)(yi)材(cai)(cai)(cai)質(zhi)的(de)密(mi)封對(dui)(dui)被密(mi)封的(de)某一(yi)(yi)(yi)工(gong)作(zuo)(zuo)介(jie)質(zhi)(如礦(kuang)物油等(deng))表(biao)現(xian)較好的(de)密(mi)封性能，而(er)對(dui)(dui)另一(yi)(yi)(yi)介(jie)質(zhi)表(biao)現(xian)極(ji)差，這(zhe)就是密(mi)封材(cai)(cai)(cai)料與液壓油的(de)相容性。還(huan)有(you)(you)(you)，各種不(bu)(bu)(bu)同(tong)(tong)(tong)的(de)密(mi)封材(cai)(cai)(cai)料對(dui)(dui)你(ni)不(bu)(bu)(bu)同(tong)(tong)(tong)的(de)工(gong)作(zuo)(zuo)條(tiao)件(jian)(jian)(jian)表(biao)現(xian)出不(bu)(bu)(bu)同(tong)(tong)(tong)的(de)性能。有(you)(you)(you)些(xie)(xie)耐(nai)(nai)熱(re)，有(you)(you)(you)些(xie)(xie)不(bu)(bu)(bu)耐(nai)(nai)熱(re);有(you)(you)(you)些(xie)(xie)耐(nai)(nai)酸，有(you)(you)(you)些(xie)(xie)耐(nai)(nai)堿，有(you)(you)(you)些(xie)(xie)耐(nai)(nai)水，有(you)(you)(you)些(xie)(xie)耐(nai)(nai)油;有(you)(you)(you)些(xie)(xie)抗(kang)熱(re)，有(you)(you)(you)些(xie)(xie)耐(nai)(nai)低溫，有(you)(you)(you)些(xie)(xie)耐(nai)(nai)高溫，等(deng)等(deng)。這(zhe)些(xie)(xie)因(yin)素(su)在考(kao)慮(lv)密(mi)封件(jian)(jian)(jian)材(cai)(cai)(cai)料的(de)時候需注意。