原平機械密封又叫端(duan)面密(mi)封，在有關標準中是這樣解說的：由至(zhi)少(shao)一(yi)對垂(chui)直于旋(xuan)轉(zhuan)軸線的端(duan)面在流體壓力和(he)補償機構彈力的作用以及輔助密(mi)封的配(pei)合(he)下保持貼合(he)并相對滑動而構成的防止(zhi)流體泄漏(lou)的裝置。

　　原平機械密封自身壓(ya)(ya)力增壓(ya)(ya)系統結構(gou)包括出水(shui)(shui)口(kou)、固(gu)(gu)(gu)(gu)(gu)(gu)定(ding)(ding)法(fa)蘭、泵(beng)(beng)(beng)體(ti)、增壓(ya)(ya)裝置(zhi)、電機轉子(zi)、吊(diao)環、防(fang)護罩、水(shui)(shui)泵(beng)(beng)(beng)、固(gu)(gu)(gu)(gu)(gu)(gu)定(ding)(ding)基座(zuo)(zuo)、底座(zuo)(zuo)、加固(gu)(gu)(gu)(gu)(gu)(gu)件(jian)(jian)、控(kong)制閥、緊(jin)(jin)固(gu)(gu)(gu)(gu)(gu)(gu)件(jian)(jian)，所述(shu)出水(shui)(shui)口(kou)與固(gu)(gu)(gu)(gu)(gu)(gu)定(ding)(ding)法(fa)蘭相(xiang)(xiang)(xiang)連(lian)(lian)(lian)接(jie)，泵(beng)(beng)(beng)體(ti)與增壓(ya)(ya)裝置(zhi)相(xiang)(xiang)(xiang)連(lian)(lian)(lian)接(jie)，增壓(ya)(ya)裝置(zhi)由(you)進(jin)水(shui)(shui)口(kou)、水(shui)(shui)管(guan)、負壓(ya)(ya)室(shi)、平(ping)衡固(gu)(gu)(gu)(gu)(gu)(gu)定(ding)(ding)盤、緊(jin)(jin)固(gu)(gu)(gu)(gu)(gu)(gu)支(zhi)架(jia)組(zu)成，進(jin)水(shui)(shui)口(kou)與水(shui)(shui)管(guan)相(xiang)(xiang)(xiang)連(lian)(lian)(lian)接(jie)，水(shui)(shui)管(guan)與負壓(ya)(ya)室(shi)相(xiang)(xiang)(xiang)連(lian)(lian)(lian)接(jie)，負壓(ya)(ya)室(shi)通過平(ping)衡固(gu)(gu)(gu)(gu)(gu)(gu)定(ding)(ding)盤保持平(ping)衡，緊(jin)(jin)固(gu)(gu)(gu)(gu)(gu)(gu)支(zhi)架(jia)與泵(beng)(beng)(beng)體(ti)固(gu)(gu)(gu)(gu)(gu)(gu)定(ding)(ding)連(lian)(lian)(lian)接(jie)，防(fang)護罩與水(shui)(shui)泵(beng)(beng)(beng)相(xiang)(xiang)(xiang)連(lian)(lian)(lian)接(jie)，水(shui)(shui)泵(beng)(beng)(beng)與固(gu)(gu)(gu)(gu)(gu)(gu)定(ding)(ding)基座(zuo)(zuo)相(xiang)(xiang)(xiang)連(lian)(lian)(lian)接(jie)，固(gu)(gu)(gu)(gu)(gu)(gu)定(ding)(ding)基座(zuo)(zuo)與底座(zuo)(zuo)緊(jin)(jin)固(gu)(gu)(gu)(gu)(gu)(gu)連(lian)(lian)(lian)接(jie)，底座(zuo)(zuo)上設有加固(gu)(gu)(gu)(gu)(gu)(gu)件(jian)(jian)，緊(jin)(jin)固(gu)(gu)(gu)(gu)(gu)(gu)件(jian)(jian)與底座(zuo)(zuo)固(gu)(gu)(gu)(gu)(gu)(gu)定(ding)(ding)連(lian)(lian)(lian)接(jie)。

　　動環和靜環的總稱叫做密封環，是構成原平機械密封件主要的元件。密封環在很大程度上決定了原平機械密封件的使用性能和壽命，所以原平機械密封件對密封環(huan)有一些特定(ding)的要求。

　　一、密封(feng)環要(yao)容易加工制(zhi)造

　　二(er)、安裝和維修要(yao)方便，價格要(yao)低廉(lian)。

　　三、密封環(huan)要有良好的耐熱沖擊能力，因此材(cai)料要有較(jiao)高的導熱系數(shu)和較(jiao)小的線(xian)膨(peng)脹系數(shu)，承受(shou)熱沖擊時不至于開裂。

　　四、密封(feng)環要(yao)有良好的(de)自(zi)潤(run)滑性，防止工作中發(fa)生短時(shi)間(jian)的(de)干(gan)摩擦，不(bu)損傷(shang)密封(feng)端面(mian)。因此，密封(feng)環材料與(yu)密封(feng)流體還要(yao)有很好的(de)浸潤(run)性。

　　五、結構簡單

　　密封環結(jie)(jie)構(gou)簡單對稱，優先考慮用(yong)整(zheng)體型結(jie)(jie)構(gou)，也可(ke)采用(yong)組合式密封環，盡(jin)量避免(mian)用(yong)密封端面噴涂式結(jie)(jie)構(gou)。

　　六、有足夠的強度和剛度

　　原平機械密封件(jian)在工(gong)作(zuo)條件(jian)下不損(sun)壞，變(bian)形應(ying)盡量的(de)(de)(de)小，工(gong)作(zuo)條件(jian)波動時仍能保持密封(feng)性。尤其是密封(feng)端(duan)面要(yao)有(you)足夠(gou)的(de)(de)(de)強度以(yi)及一定的(de)(de)(de)耐腐蝕能力，保證產品的(de)(de)(de)使(shi)用壽(shou)命。