1、液壓密封件之形式選擇

　　在液壓系(xi)統中，常見的密(mi)封(feng)(feng)(feng)形(xing)式(shi)有(you)擠壓型O形(xing)密(mi)封(feng)(feng)(feng)圈、Y形(xing)圈、V形(xing)圈、U形(xing)圈唇(chun)(chun)(chun)形(xing)密(mi)封(feng)(feng)(feng)。唇(chun)(chun)(chun)形(xing)密(mi)封(feng)(feng)(feng)圈主要用于往(wang)復動密(mi)封(feng)(feng)(feng)，與O形(xing)圈等擠壓密(mi)封(feng)(feng)(feng)相比，往(wang)復動密(mi)封(feng)(feng)(feng)使用唇(chun)(chun)(chun)形(xing)密(mi)封(feng)(feng)(feng)圈具有(you)更好的綜合性能和更長(chang)的使用壽命(ming)。

　　唇(chun)形(xing)(xing)密(mi)(mi)封(feng)圈的(de)(de)(de)密(mi)(mi)封(feng)壓(ya)(ya)緊力(li)是隨介(jie)質(zhi)壓(ya)(ya)力(li)的(de)(de)(de)改(gai)變而變化(hua)的(de)(de)(de)，工(gong)作(zuo)(zuo)中(zhong)(zhong)始終應監控介(jie)質(zhi)壓(ya)(ya)力(li)的(de)(de)(de)變化(hua)，即能保證足夠的(de)(de)(de)密(mi)(mi)封(feng)壓(ya)(ya)緊力(li)，又(you)不(bu)至于產生(sheng)(sheng)過大的(de)(de)(de)摩擦力(li)，擠壓(ya)(ya)性密(mi)(mi)封(feng)主要靠預(yu)壓(ya)(ya)緊力(li)產生(sheng)(sheng)密(mi)(mi)封(feng)力(li)，密(mi)(mi)封(feng)圈接(jie)觸(chu)壓(ya)(ya)力(li)預(yu)先給定(ding)，工(gong)作(zuo)(zuo)中(zhong)(zhong)不(bu)能根據介(jie)質(zhi)壓(ya)(ya)力(li)的(de)(de)(de)改(gai)變而變化(hua)。大的(de)(de)(de)預(yu)壓(ya)(ya)力(li)會使密(mi)(mi)封(feng)圈與密(mi)(mi)封(feng)面接(jie)觸(chu)面積增大，產生(sheng)(sheng)很大的(de)(de)(de)摩擦阻(zu)力(li)，過大的(de)(de)(de)摩擦力(li)會造成(cheng)密(mi)(mi)封(feng)圈的(de)(de)(de)破損，在低壓(ya)(ya)時造成(cheng)啟動困難，或產生(sheng)(sheng)爬(pa)行現象(xiang)，唇(chun)形(xing)(xing)密(mi)(mi)封(feng)圈可(ke)以(yi)通(tong)過唇(chun)部(bu)撐開(kai)，變形(xing)(xing)補(bu)償小的(de)(de)(de)磨(mo)損量(liang)，保證密(mi)(mi)封(feng)效果和密(mi)(mi)封(feng)壽(shou)命;而O形(xing)(xing)圈隨著(zhu)摩擦余量(liang)的(de)(de)(de)減少，直接(jie)影響(xiang)其(qi)密(mi)(mi)封(feng)性。

　　2、液(ye)壓密封件之材料選擇

　　密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)件(jian)(jian)(jian)形式和(he)結構(gou)現在一(yi)般已經定型，各(ge)(ge)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)件(jian)(jian)(jian)質(zhi)量(liang)區別主要在于制作(zuo)材(cai)(cai)(cai)料(liao)上(shang)。密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)材(cai)(cai)(cai)料(liao)主要使(shi)用橡膠和(he)合成樹脂。由于各(ge)(ge)種材(cai)(cai)(cai)料(liao)性(xing)能(neng)(neng)特點(dian)不(bu)同(tong)(tong)(tong)(tong)，性(xing)能(neng)(neng)特點(dian)不(bu)同(tong)(tong)(tong)(tong)，用途也就(jiu)有(you)所(suo)不(bu)同(tong)(tong)(tong)(tong)。選用時需根據(ju)不(bu)同(tong)(tong)(tong)(tong)的(de)(de)使(shi)用條(tiao)件(jian)(jian)(jian)和(he)不(bu)同(tong)(tong)(tong)(tong)的(de)(de)使(shi)用條(tiao)件(jian)(jian)(jian)作(zuo)出合適的(de)(de)選擇。另(ling)外，某(mou)一(yi)材(cai)(cai)(cai)質(zhi)的(de)(de)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)對被密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)的(de)(de)某(mou)一(yi)工(gong)作(zuo)介質(zhi)(如礦物(wu)油(you)(you)等(deng))表(biao)現較好的(de)(de)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)性(xing)能(neng)(neng)，而對另(ling)一(yi)介質(zhi)表(biao)現極(ji)差，這就(jiu)是密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)材(cai)(cai)(cai)料(liao)與液(ye)壓油(you)(you)的(de)(de)相容性(xing)。還(huan)有(you)，各(ge)(ge)種不(bu)同(tong)(tong)(tong)(tong)的(de)(de)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)材(cai)(cai)(cai)料(liao)對你(ni)不(bu)同(tong)(tong)(tong)(tong)的(de)(de)工(gong)作(zuo)條(tiao)件(jian)(jian)(jian)表(biao)現出不(bu)同(tong)(tong)(tong)(tong)的(de)(de)性(xing)能(neng)(neng)。有(you)些耐(nai)(nai)(nai)熱，有(you)些不(bu)耐(nai)(nai)(nai)熱;有(you)些耐(nai)(nai)(nai)酸(suan)，有(you)些耐(nai)(nai)(nai)堿，有(you)些耐(nai)(nai)(nai)水，有(you)些耐(nai)(nai)(nai)油(you)(you);有(you)些抗熱，有(you)些耐(nai)(nai)(nai)低溫，有(you)些耐(nai)(nai)(nai)高溫，等(deng)等(deng)。這些因素在考(kao)慮密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)件(jian)(jian)(jian)材(cai)(cai)(cai)料(liao)的(de)(de)時候需注意。