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發布時間:2021-12-21 11:48:30 人氣:101233 來源(yuan):
1、液壓密封件之形式(shi)選擇
在液壓系統中,常見的密封(feng)(feng)形(xing)(xing)式有擠壓型O形(xing)(xing)密封(feng)(feng)圈(quan)、Y形(xing)(xing)圈(quan)、V形(xing)(xing)圈(quan)、U形(xing)(xing)圈(quan)唇(chun)形(xing)(xing)密封(feng)(feng)。唇(chun)形(xing)(xing)密封(feng)(feng)圈(quan)主要用(yong)于往復動密封(feng)(feng),與O形(xing)(xing)圈(quan)等擠壓密封(feng)(feng)相比,往復動密封(feng)(feng)使用(yong)唇(chun)形(xing)(xing)密封(feng)(feng)圈(quan)具有更(geng)好的綜合(he)性(xing)能和更(geng)長的使用(yong)壽命。
唇形(xing)(xing)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)(quan)的(de)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)壓(ya)(ya)(ya)(ya)緊(jin)力(li)(li)是隨(sui)介(jie)質(zhi)壓(ya)(ya)(ya)(ya)力(li)(li)的(de)改變(bian)而變(bian)化的(de),工作中始終(zhong)應監控(kong)介(jie)質(zhi)壓(ya)(ya)(ya)(ya)力(li)(li)的(de)變(bian)化,即能保證(zheng)足夠的(de)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)壓(ya)(ya)(ya)(ya)緊(jin)力(li)(li),又不(bu)至(zhi)于產(chan)生(sheng)過(guo)大的(de)摩(mo)擦力(li)(li),擠(ji)壓(ya)(ya)(ya)(ya)性密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)主要靠預(yu)壓(ya)(ya)(ya)(ya)緊(jin)力(li)(li)產(chan)生(sheng)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)力(li)(li),密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)(quan)接觸(chu)(chu)壓(ya)(ya)(ya)(ya)力(li)(li)預(yu)先給定(ding),工作中不(bu)能根據介(jie)質(zhi)壓(ya)(ya)(ya)(ya)力(li)(li)的(de)改變(bian)而變(bian)化。大的(de)預(yu)壓(ya)(ya)(ya)(ya)力(li)(li)會(hui)使密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)(quan)與密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)面(mian)接觸(chu)(chu)面(mian)積(ji)增大,產(chan)生(sheng)很大的(de)摩(mo)擦阻力(li)(li),過(guo)大的(de)摩(mo)擦力(li)(li)會(hui)造成密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)(quan)的(de)破(po)損,在低壓(ya)(ya)(ya)(ya)時造成啟動困難(nan),或產(chan)生(sheng)爬行現象(xiang),唇形(xing)(xing)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)(quan)可以通過(guo)唇部(bu)撐(cheng)開,變(bian)形(xing)(xing)補(bu)償小的(de)磨(mo)損量,保證(zheng)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)效果和密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)壽命;而O形(xing)(xing)圈(quan)(quan)(quan)(quan)隨(sui)著摩(mo)擦余量的(de)減少,直接影(ying)響其密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)性。
2、液壓(ya)密封件之材料選擇
密(mi)封(feng)(feng)件(jian)(jian)形(xing)式和(he)結構現在一(yi)般(ban)已經定型,各密(mi)封(feng)(feng)件(jian)(jian)質量區別主要在于制作(zuo)(zuo)材(cai)(cai)料(liao)(liao)上。密(mi)封(feng)(feng)材(cai)(cai)料(liao)(liao)主要使(shi)(shi)用(yong)橡膠(jiao)和(he)合(he)成樹(shu)脂。由于各種(zhong)材(cai)(cai)料(liao)(liao)性(xing)(xing)能(neng)特點不同(tong)(tong),性(xing)(xing)能(neng)特點不同(tong)(tong),用(yong)途也(ye)就有(you)(you)所不同(tong)(tong)。選(xuan)用(yong)時需(xu)根(gen)據不同(tong)(tong)的(de)(de)(de)使(shi)(shi)用(yong)條(tiao)(tiao)件(jian)(jian)和(he)不同(tong)(tong)的(de)(de)(de)使(shi)(shi)用(yong)條(tiao)(tiao)件(jian)(jian)作(zuo)(zuo)出(chu)(chu)合(he)適的(de)(de)(de)選(xuan)擇。另外,某(mou)一(yi)材(cai)(cai)質的(de)(de)(de)密(mi)封(feng)(feng)對(dui)被密(mi)封(feng)(feng)的(de)(de)(de)某(mou)一(yi)工作(zuo)(zuo)介(jie)質(如礦(kuang)物(wu)油等(deng)(deng))表(biao)現較(jiao)好的(de)(de)(de)密(mi)封(feng)(feng)性(xing)(xing)能(neng),而對(dui)另一(yi)介(jie)質表(biao)現極差,這(zhe)就是(shi)密(mi)封(feng)(feng)材(cai)(cai)料(liao)(liao)與液壓(ya)油的(de)(de)(de)相容性(xing)(xing)。還有(you)(you),各種(zhong)不同(tong)(tong)的(de)(de)(de)密(mi)封(feng)(feng)材(cai)(cai)料(liao)(liao)對(dui)你不同(tong)(tong)的(de)(de)(de)工作(zuo)(zuo)條(tiao)(tiao)件(jian)(jian)表(biao)現出(chu)(chu)不同(tong)(tong)的(de)(de)(de)性(xing)(xing)能(neng)。有(you)(you)些(xie)(xie)(xie)(xie)(xie)(xie)耐(nai)(nai)熱(re),有(you)(you)些(xie)(xie)(xie)(xie)(xie)(xie)不耐(nai)(nai)熱(re);有(you)(you)些(xie)(xie)(xie)(xie)(xie)(xie)耐(nai)(nai)酸,有(you)(you)些(xie)(xie)(xie)(xie)(xie)(xie)耐(nai)(nai)堿,有(you)(you)些(xie)(xie)(xie)(xie)(xie)(xie)耐(nai)(nai)水,有(you)(you)些(xie)(xie)(xie)(xie)(xie)(xie)耐(nai)(nai)油;有(you)(you)些(xie)(xie)(xie)(xie)(xie)(xie)抗(kang)熱(re),有(you)(you)些(xie)(xie)(xie)(xie)(xie)(xie)耐(nai)(nai)低溫(wen),有(you)(you)些(xie)(xie)(xie)(xie)(xie)(xie)耐(nai)(nai)高溫(wen),等(deng)(deng)等(deng)(deng)。這(zhe)些(xie)(xie)(xie)(xie)(xie)(xie)因素(su)在考慮密(mi)封(feng)(feng)件(jian)(jian)材(cai)(cai)料(liao)(liao)的(de)(de)(de)時候需(xu)注意。