O形密(mi)封(feng)圈(quan)的(de)(de)密(mi)封(feng)原理O形密(mi)封(feng)圈(quan)簡稱O形圈(quan)，是一種截面為圓(yuan)形的(de)(de)橡膠圈(quan)。O形密(mi)封(feng)圈(quan)是液(ye)壓(ya)、氣(qi)動體系中利(li)用(yong)的(de)(de)一種密(mi)封(feng)件。O形圈(quan)有(you)良(liang)好的(de)(de)密(mi)封(feng)性，既可(ke)(ke)(ke)用(yong)于(yu)靜密(mi)封(feng)，也可(ke)(ke)(ke)用(yong)于(yu)往回生(sheng)動密(mi)封(feng)中；不僅可(ke)(ke)(ke)單獨利(li)用(yong)，而且是很多(duo)組(zu)合式密(mi)封(feng)裝置中的(de)(de)基本組(zu)成局部。它的(de)(de)實用(yong)范(fan)疇很寬(kuan)，假如資料抉擇(ze)切(qie)當，可(ke)(ke)(ke)能滿(man)意各種活動前提的(de)(de)請求(qiu)，工作壓(ya)力可(ke)(ke)(ke)從(cong)1.333×105Pa的(de)(de)真空到(dao)400MPa高壓(ya)；溫度范(fan)疇可(ke)(ke)(ke)從(cong)-60℃到(dao)200℃。

與(yu)其它(ta)密(mi)封(feng)型式比較(jiao)，O形(xing)密(mi)封(feng)圈存在以下(xia)特點： 1）結構尺(chi)寸小，裝拆便利。 2）靜、動密(mi)封(feng)均可利用(yong)，用(yong)作(zuo)靜密(mi)封(feng)時多少乎不泄漏(lou)。 3）利用(yong)單件O形(xing)密(mi)封(feng)圈，有雙向(xiang)密(mi)封(feng)作(zuo)用(yong)。? ? ?4）動摩擦(ca)阻力較(jiao)小。5）價格低廉。

O形(xing)密(mi)(mi)封(feng)(feng)(feng)圈(quan)是(shi)一種擠壓(ya)型(xing)(xing)密(mi)(mi)封(feng)(feng)(feng)，擠壓(ya)型(xing)(xing)密(mi)(mi)封(feng)(feng)(feng)的基本(ben)工作原(yuan)理是(shi)依附密(mi)(mi)封(feng)(feng)(feng)件產(chan)生彈(dan)性變形(xing)，在(zai)(zai)密(mi)(mi)封(feng)(feng)(feng)接觸(chu)(chu)(chu)面(mian)上造成(cheng)接觸(chu)(chu)(chu)壓(ya)力，接觸(chu)(chu)(chu)壓(ya)力大于被密(mi)(mi)封(feng)(feng)(feng)介質的內壓(ya)，則(ze)(ze)不(bu)產(chan)生泄漏，反之(zhi)則(ze)(ze)產(chan)生泄漏。在(zai)(zai)用于靜密(mi)(mi)封(feng)(feng)(feng)跟(gen)動(dong)密(mi)(mi)封(feng)(feng)(feng)時(shi)，密(mi)(mi)封(feng)(feng)(feng)接觸(chu)(chu)(chu)面(mian)接觸(chu)(chu)(chu)壓(ya)力產(chan)生起(qi)因跟(gen)盤算方法(fa)不(bu)盡雷同(tong)，需分辨說明。

　　1、用于(yu)靜密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)時(shi)的(de)(de)(de)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)原理? ? ? 在靜密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)中以O形(xing)(xing)(xing)圈(quan)(quan)(quan)利用為(wei)(wei)(wei)普遍。假如(ru)設(she)計(ji)、利用正確(que)，O形(xing)(xing)(xing)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)在靜密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)中可能(neng)實現(xian)無泄漏(lou)的(de)(de)(de)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)。? ? ? O形(xing)(xing)(xing)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)裝入(ru)(ru)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)槽(cao)后(hou)(hou)，其截面蒙受接(jie)(jie)觸緊縮(suo)應力(li)(li)(li)而產生(sheng)彈(dan)性(xing)(xing)變(bian)形(xing)(xing)(xing)。對接(jie)(jie)觸面產生(sheng)一定的(de)(de)(de)初始接(jie)(jie)觸壓(ya)力(li)(li)(li)Po。即便(bian)(bian)不介(jie)(jie)質壓(ya)力(li)(li)(li)或者壓(ya)力(li)(li)(li)很(hen)小，O形(xing)(xing)(xing)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)靠自(zi)身(shen)的(de)(de)(de)彈(dan)性(xing)(xing)力(li)(li)(li)作(zuo)用而也能(neng)實現(xian)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)；當容腔內充入(ru)(ru)有壓(ya)力(li)(li)(li)的(de)(de)(de)介(jie)(jie)質后(hou)(hou)，在介(jie)(jie)質壓(ya)力(li)(li)(li)的(de)(de)(de)作(zuo)用下(xia)，O形(xing)(xing)(xing)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)產生(sheng)位移，移向低(di)壓(ya)側，同(tong)時(shi)其彈(dan)性(xing)(xing)變(bian)形(xing)(xing)(xing)進一步加大(da)，填充跟封(feng)(feng)(feng)(feng)(feng)閉縫隙δ。此時(shi)，坐用于(yu)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)副偶合面的(de)(de)(de)接(jie)(jie)觸壓(ya)力(li)(li)(li)回升為(wei)(wei)(wei)Pm：? ? ?Pm=Po Pp? ? ?式中Pp——經O形(xing)(xing)(xing)圈(quan)(quan)(quan)傳給接(jie)(jie)觸面的(de)(de)(de)接(jie)(jie)觸壓(ya)力(li)(li)(li)（0.1MPa）? ? ?Pp=K〃P? ? ?K——壓(ya)力(li)(li)(li)傳遞(di)系數，對橡(xiang)膠制(zhi)O形(xing)(xing)(xing)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)K=1；? ? ?P——被密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)液體(ti)的(de)(de)(de)壓(ya)力(li)(li)(li)（0.1MPa）。? ? ?從而大(da)大(da)增加了密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)后(hou)(hou)果。因為(wei)(wei)(wei)個(ge)別(bie)K≥1，所以Pm＞P。由此可見，只有O形(xing)(xing)(xing)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)存(cun)在初始壓(ya)力(li)(li)(li)，就能(neng)實現(xian)無泄漏(lou)的(de)(de)(de)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)。這種靠介(jie)(jie)質自(zi)身(shen)壓(ya)力(li)(li)(li)來轉變(bian)O形(xing)(xing)(xing)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)接(jie)(jie)觸狀況(kuang)，使之(zhi)實現(xian)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)的(de)(de)(de)性(xing)(xing)質，稱為(wei)(wei)(wei)自(zi)封(feng)(feng)(feng)(feng)(feng)作(zuo)用。實際上(shang)，緊縮(suo)變(bian)形(xing)(xing)(xing)即便(bian)(bian)為(wei)(wei)(wei)零，在油(you)壓(ya)力(li)(li)(li)下(xia)也能(neng)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)，但實際上(shang)O形(xing)(xing)(xing)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)裝置時(shi)可能(neng)會有偏(pian)心(xin)。所以，O形(xing)(xing)(xing)圈(quan)(quan)(quan)裝入(ru)(ru)密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)溝(gou)槽(cao)后(hou)(hou)，其斷面個(ge)別(bie)受到7%—30%的(de)(de)(de)緊縮(suo)變(bian)形(xing)(xing)(xing)。靜密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)取較(jiao)大(da)的(de)(de)(de)緊縮(suo)率值，動密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)取較(jiao)小的(de)(de)(de)緊縮(suo)率值。這是因為(wei)(wei)(wei)合成橡(xiang)膠在低(di)溫(wen)下(xia)要緊縮(suo)，所以靜密(mi)(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)O形(xing)(xing)(xing)圈(quan)(quan)(quan)的(de)(de)(de)預(yu)緊縮(suo)量應考慮(lv)彌補它的(de)(de)(de)低(di)溫(wen)緊縮(suo)量。

　　2、用(yong)(yong)于(yu)往(wang)(wang)回(hui)(hui)生(sheng)(sheng)動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)時(shi)(shi)的(de)(de)(de)(de)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)原理(li)? ? ? 在液(ye)(ye)(ye)壓(ya)轉(zhuan)動(dong)(dong)(dong)(dong)、氣動(dong)(dong)(dong)(dong)元件與(yu)(yu)(yu)體(ti)(ti)(ti)系中，往(wang)(wang)復動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)是一種(zhong)常見的(de)(de)(de)(de)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)請求。能(neng)源缸活(huo)(huo)塞與(yu)(yu)(yu)缸體(ti)(ti)(ti)、活(huo)(huo)塞干涉(she)缸蓋以及各(ge)類(lei)滑(hua)閥(fa)上都用(yong)(yong)到往(wang)(wang)回(hui)(hui)生(sheng)(sheng)動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)。縫隙由圓(yuan)柱(zhu)桿(gan)與(yu)(yu)(yu)圓(yuan)柱(zhu)孔形成，桿(gan)在圓(yuan)柱(zhu)孔內軸(zhou)向(xiang)活(huo)(huo)動(dong)(dong)(dong)(dong)。密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)作用(yong)(yong)限度流體(ti)(ti)(ti)的(de)(de)(de)(de)軸(zhou)向(xiang)泄(xie)漏。用(yong)(yong)作往(wang)(wang)回(hui)(hui)生(sheng)(sheng)動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)時(shi)(shi)，O形圈(quan)的(de)(de)(de)(de)預密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)后果(guo)跟自(zi)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)作用(yong)(yong)與(yu)(yu)(yu)靜密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)一樣，并(bing)且因為(wei)(wei)O形圈(quan)自(zi)身的(de)(de)(de)(de)彈力，而存在磨損后主動(dong)(dong)(dong)(dong)彌補的(de)(de)(de)(de)才干。但因為(wei)(wei)液(ye)(ye)(ye)體(ti)(ti)(ti)介質密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)時(shi)(shi)，因為(wei)(wei)桿(gan)活(huo)(huo)動(dong)(dong)(dong)(dong)速度、液(ye)(ye)(ye)體(ti)(ti)(ti)的(de)(de)(de)(de)壓(ya)力、粘(zhan)(zhan)度的(de)(de)(de)(de)作用(yong)(yong)，情況比靜密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)龐雜。? ? ? 當液(ye)(ye)(ye)體(ti)(ti)(ti)在壓(ya)力作用(yong)(yong)下，液(ye)(ye)(ye)體(ti)(ti)(ti)分子與(yu)(yu)(yu)金(jin)屬名義彼此作用(yong)(yong)，油(you)(you)液(ye)(ye)(ye)中所(suo)含的(de)(de)(de)(de)“性分子”在金(jin)屬名義上周到而整潔的(de)(de)(de)(de)排列(lie)，沿滑(hua)移面(mian)與(yu)(yu)(yu)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)件間形成一個強固的(de)(de)(de)(de)邊界層油(you)(you)膜(mo)(mo)，并(bing)且對(dui)滑(hua)移面(mian)產生(sheng)(sheng)的(de)(de)(de)(de)附著力。該液(ye)(ye)(ye)體(ti)(ti)(ti)薄膜(mo)(mo)始終存在于(yu)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)件與(yu)(yu)(yu)往(wang)(wang)回(hui)(hui)生(sheng)(sheng)動(dong)(dong)(dong)(dong)面(mian)之間，它(ta)亦(yi)起(qi)一定的(de)(de)(de)(de)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)作用(yong)(yong)，并(bing)且對(dui)活(huo)(huo)動(dong)(dong)(dong)(dong)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)面(mian)的(de)(de)(de)(de)潤滑(hua)是十分重要(yao)的(de)(de)(de)(de)。然而對(dui)泄(xie)漏來(lai)講是有(you)害(hai)的(de)(de)(de)(de)。但往(wang)(wang)回(hui)(hui)生(sheng)(sheng)動(dong)(dong)(dong)(dong)的(de)(de)(de)(de)軸(zhou)向(xiang)外拖出時(shi)(shi)，軸(zhou)上的(de)(de)(de)(de)液(ye)(ye)(ye)體(ti)(ti)(ti)薄膜(mo)(mo)便與(yu)(yu)(yu)軸(zhou)一起(qi)拉出，因為(wei)(wei)密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)件的(de)(de)(de)(de)“擦(ca)拭”作用(yong)(yong)，當往(wang)(wang)回(hui)(hui)生(sheng)(sheng)動(dong)(dong)(dong)(dong)的(de)(de)(de)(de)軸(zhou)縮回(hui)(hui)時(shi)(shi)，該液(ye)(ye)(ye)體(ti)(ti)(ti)薄膜(mo)(mo)便被密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)元件阻(zu)留在外面(mian)。隨(sui)(sui)著往(wang)(wang)回(hui)(hui)生(sheng)(sheng)動(dong)(dong)(dong)(dong)行程(cheng)次數增多，阻(zu)留在外面(mian)的(de)(de)(de)(de)液(ye)(ye)(ye)體(ti)(ti)(ti)就(jiu)越多，后形成油(you)(you)滴，這就(jiu)是往(wang)(wang)回(hui)(hui)生(sheng)(sheng)動(dong)(dong)(dong)(dong)式密(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)(feng)裝置的(de)(de)(de)(de)泄(xie)漏。因為(wei)(wei)液(ye)(ye)(ye)壓(ya)油(you)(you)的(de)(de)(de)(de)粘(zhan)(zhan)度隨(sui)(sui)著溫度的(de)(de)(de)(de)升(sheng)高(gao)而降落(luo)，油(you)(you)膜(mo)(mo)厚度相應(ying)減小，所(suo)以液(ye)(ye)(ye)壓(ya)設備在低溫下啟動(dong)(dong)(dong)(dong)時(shi)(shi)，活(huo)(huo)動(dong)(dong)(dong)(dong)開端時(shi)(shi)的(de)(de)(de)(de)泄(xie)漏較(jiao)大，隨(sui)(sui)著活(huo)(huo)動(dong)(dong)(dong)(dong)進程(cheng)中因各(ge)種(zhong)喪失引起(qi)溫度升(sheng)高(gao)，泄(xie)漏量有(you)逐步降落(luo)的(de)(de)(de)(de)趨勢(shi)。

O形圈作(zuo)為往復式(shi)(shi)密封(feng)(feng)，結構緊(jin)湊、尺寸(cun)小(xiao)，可(ke)能降(jiang)落元件(jian)價格。重要(yao)用(yong)在：? ? ? 1）低(di)(di)壓(ya)(ya)液壓(ya)(ya)元件(jian)中，個別限于短(duan)行(xing)程(cheng)跟(gen)10MPa左(zuo)右的(de)中等壓(ya)(ya)力(li)(li)。? ? ? 2）小(xiao)直徑(jing)、短(duan)行(xing)程(cheng)以及中等壓(ya)(ya)力(li)(li)的(de)液壓(ya)(ya)滑(hua)閥(fa)(fa)中。? ? ? 3）氣動(dong)(dong)滑(hua)閥(fa)(fa)跟(gen)氣動(dong)(dong)缸中。? ? ? 4）作(zuo)為組合(he)(he)式(shi)(shi)往復動(dong)(dong)密封(feng)(feng)裝置中的(de)彈(dan)性(xing)體。? ? ?O形圈作(zuo)為往復動(dong)(dong)密封(feng)(feng)適合(he)(he)小(xiao)直徑(jing)、短(duan)行(xing)程(cheng)、中低(di)(di)壓(ya)(ya)力(li)(li)的(de)利(li)用(yong)處合(he)(he)，氣動(dong)(dong)缸、氣動(dong)(dong)滑(hua)閥(fa)(fa)等往回(hui)生動(dong)(dong)元件(jian)中。在液壓(ya)(ya)元件(jian)中，用(yong)O形圈作(zuo)重要(yao)動(dong)(dong)密封(feng)(feng)，個別限于短(duan)行(xing)程(cheng)跟(gen)10MPa左(zuo)右的(de)中低(di)(di)壓(ya)(ya)力(li)(li)。O形圈不合(he)(he)實用(yong)作(zuo)速度(du)十分低(di)(di)的(de)往復動(dong)(dong)密封(feng)(feng)跟(gen)單獨作(zuo)為高壓(ya)(ya)往復動(dong)(dong)密封(feng)(feng)。這重要(yao)是因為在這種(zhong)前提下摩擦較大(da)，會導(dao)致密封(feng)(feng)過早生效。在型式(shi)(shi)利(li)用(yong)中，都要(yao)依據密封(feng)(feng)件(jian)的(de)額定數據或才(cai)(cai)干來利(li)用(yong)，并且要(yao)裝配(pei)切當，才(cai)(cai)干得到滿意的(de)機能。

　　3、旋(xuan)轉(zhuan)(zhuan)活(huo)(huo)動(dong)用密(mi)封? ? 在旋(xuan)轉(zhuan)(zhuan)活(huo)(huo)動(dong)密(mi)封中，通常采取(qu)油(you)封跟機械密(mi)封。然(ran)而(er)油(you)封的(de)(de)(de)(de)(de)利(li)用壓力較低(di)，而(er)且(qie)(qie)與(yu)O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈比(bi)較，顯得(de)過大(da)跟龐(pang)雜，工(gong)(gong)(gong)藝性(xing)也差。機械密(mi)封誠然(ran)可(ke)用于(yu)(yu)高(gao)(gao)(gao)壓（40MPa）、高(gao)(gao)(gao)速(su)(su)（50m/s）及高(gao)(gao)(gao)溫（400℃），然(ran)而(er)結構(gou)更(geng)加龐(pang)雜、宏(hong)大(da)，而(er)且(qie)(qie)本錢高(gao)(gao)(gao)，只實(shi)用于(yu)(yu)石油(you)、化工(gong)(gong)(gong)等作(zuo)用的(de)(de)(de)(de)(de)一些(xie)重型機械設(she)(she)備(bei)上。? ? ?O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈用于(yu)(yu)旋(xuan)轉(zhuan)(zhuan)活(huo)(huo)動(dong)存在的(de)(de)(de)(de)(de)重要(yao)問題是焦(jiao)耳(er)熱(re)(re)(re)效應。焦(jiao)耳(er)熱(re)(re)(re)效應使(shi)高(gao)(gao)(gao)速(su)(su)的(de)(de)(de)(de)(de)旋(xuan)轉(zhuan)(zhuan)軸與(yu)O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈的(de)(de)(de)(de)(de)接(jie)觸(chu)(chu)處產(chan)生磨(mo)擦熱(re)(re)(re)，生成的(de)(de)(de)(de)(de)熱(re)(re)(re)量(liang)使(shi)這(zhe)些(xie)接(jie)觸(chu)(chu)部位的(de)(de)(de)(de)(de)溫度一直(zhi)回升，橡(xiang)膠資料受熱(re)(re)(re)重大(da)變形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)，緊(jin)(jin)縮(suo)(suo)(suo)量(liang)與(yu)伸(shen)長(chang)量(liang)產(chan)生變更(geng)的(de)(de)(de)(de)(de)景象。發(fa)熱(re)(re)(re)還(huan)加速(su)(su)密(mi)封資料老(lao)化，降落了? O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈的(de)(de)(de)(de)(de)利(li)用壽命；破(po)壞密(mi)封油(you)膜(mo)，由此引起斷(duan)(duan)油(you)景象，加速(su)(su)密(mi)封的(de)(de)(de)(de)(de)磨(mo)損。? ? ?基于(yu)(yu)上述情(qing)況(kuang)，近(jin)年來國(guo)內(nei)外旋(xuan)轉(zhuan)(zhuan)活(huo)(huo)動(dong)用O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈進行了普遍(bian)深刻的(de)(de)(de)(de)(de)研(yan)究(jiu)。為了避免呈(cheng)現焦(jiao)耳(er)熱(re)(re)(re)效應，要(yao)害在于(yu)(yu)依據橡(xiang)膠的(de)(de)(de)(de)(de)機能來正確(que)地抉擇(ze)設(she)(she)計(ji)O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈的(de)(de)(de)(de)(de)結構(gou)參數(shu)，重要(yao)是O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈的(de)(de)(de)(de)(de)拉伸(shen)量(liang)跟緊(jin)(jin)縮(suo)(suo)(suo)率。依據實(shi)驗，將(jiang)(jiang)旋(xuan)轉(zhuan)(zhuan)活(huo)(huo)動(dong)用O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈設(she)(she)計(ji)成內(nei)徑(jing)與(yu)旋(xuan)轉(zhuan)(zhuan)軸直(zhi)徑(jing)相等或稍(shao)大(da)些(xie)，個(ge)別大(da)3%~5%，在裝置(zhi)O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈時，從內(nei)徑(jing)向里緊(jin)(jin)縮(suo)(suo)(suo)，并(bing)將(jiang)(jiang)斷(duan)(duan)面的(de)(de)(de)(de)(de)緊(jin)(jin)縮(suo)(suo)(suo)量(liang)也設(she)(she)計(ji)得(de)小一些(xie)，個(ge)別約為5%。并(bing)且(qie)(qie)，盡(jin)量(liang)采取(qu)受熱(re)(re)(re)量(liang)影響小的(de)(de)(de)(de)(de)密(mi)封資料，充分(fen)考慮O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈裝置(zhi)處的(de)(de)(de)(de)(de)散熱(re)(re)(re)問題。這(zhe)樣(yang)就使(shi)O形(xing)(xing)(xing)(xing)(xing)(xing)(xing)(xing)圈的(de)(de)(de)(de)(de)工(gong)(gong)(gong)作(zuo)情(qing)況(kuang)大(da)為改良，可(ke)利(li)用于(yu)(yu)轉(zhuan)(zhuan)速(su)(su)達4m/s的(de)(de)(de)(de)(de)旋(xuan)轉(zhuan)(zhuan)軸的(de)(de)(de)(de)(de)密(mi)封。