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聯系客服,馬上詢價
發布時間:2021-06-01 15:16:25 人氣:182304 來源:川工密封
隴南機械密封是一種(zhong)依靠彈(dan)(dan)性元件對動(dong)、靜環(huan)(huan)端(duan)(duan)面密(mi)封副的預緊(jin)和介質壓(ya)力(li)與彈(dan)(dan)性元件壓(ya)力(li)的壓(ya)緊(jin)而達(da)到密(mi)封的軸(zhou)向端(duan)(duan)面密(mi)封裝置。動(dong)環(huan)(huan)和靜環(huan)(huan)的端(duan)(duan)面組成一對摩(mo)擦副,動(dong)環(huan)(huan)靠密(mi)封室中液體的壓(ya)力(li)使其端(duan)(duan)面壓(ya)緊(jin)在靜環(huan)(huan)端(duan)(duan)面上,并在兩環(huan)(huan)端(duan)(duan)面上產(chan)生適當的比壓(ya)和保持一層極薄的液體膜而達(da)到密(mi)封的目的。
常用隴南機械密封結(jie)構由靜止(zhi)(zhi)環(huan)(huan)(huan)(靜環(huan)(huan)(huan))、旋(xuan)轉環(huan)(huan)(huan)(動環(huan)(huan)(huan))、彈性(xing)元(yuan)(yuan)件(jian)(jian)、彈簧(huang)座、固(gu)緊(jin)件(jian)(jian)、旋(xuan)轉環(huan)(huan)(huan)輔助(zhu)密封圈和(he)靜止(zhi)(zhi)環(huan)(huan)(huan)輔助(zhu)密封圈等(deng)元(yuan)(yuan)件(jian)(jian)組成(cheng),防轉銷固(gu)定在壓蓋(gai)上以防止(zhi)(zhi)靜止(zhi)(zhi)環(huan)(huan)(huan)轉動。這些元(yuan)(yuan)件(jian)(jian)都有哪些作用呢?
(1)動(dong)、靜環:保持(chi)緊密(mi)(mi)貼合(he)(he)組成密(mi)(mi)封面防止(zhi)介質泄漏。要(yao)求動(dong)、靜環具(ju)有良好(hao)的耐(nai)磨性動(dong)環可(ke)以軸(zhou)向移動(dong),自動(dong)補償密(mi)(mi)封面磨損,使之與靜環良好(hao)地貼合(he)(he),靜環有浮動(dong)性,起緩沖作用。
(2)彈性元件(彈簧、波紋板、蛇形套等):主要作用是對密封端面產生一定的預緊壓力,使端面在啟動、停車和介質壓力波動時能保持良好的接合。同時用來克服輔助密封圈與軸之間的摩擦力,使補償環沿軸向移動,以補償端面磨損后形成的間隙。此外,還可對軸的跳動等引起的振動起一定的緩沖作用。用的彈性元件有圓柱螺旋壓縮彈簧、波形片彈簧、蝶形彈簧和波紋管。其中圓柱螺旋壓縮彈簧使用廣。波形彈簧和蝶形彈簧具有軸向尺寸小,剛度大,結構緊湊的優點,但軸向位移和彈簧力較小,一般適用于軸向尺寸要求很緊湊的輕型隴南機械密封。波形管(guan)常用于高溫、低溫、強腐蝕等特殊條(tiao)件。
(3)輔助密(mi)封(feng)(feng)(feng)(0形環(huan)(huan)、V形環(huan)(huan)、楔形環(huan)(huan)及其他異形密(mi)封(feng)(feng)(feng)環(huan)(huan)):主要(yao)起(qi)到(dao)靜(jing)(jing)環(huan)(huan)和(he)動(dong)(dong)環(huan)(huan)的(de)密(mi)封(feng)(feng)(feng)作(zuo)用,同(tong)時也起(qi)到(dao)浮動(dong)(dong)性(xing)和(he)緩沖的(de)作(zuo)用。要(yao)求靜(jing)(jing)環(huan)(huan)的(de)輔助密(mi)封(feng)(feng)(feng)元件(jian)保(bao)證靜(jing)(jing)環(huan)(huan)與(yu)壓蓋(gai)之間(jian)的(de)密(mi)封(feng)(feng)(feng)性(xing),使靜(jing)(jing)環(huan)(huan)有(you)一定的(de)浮動(dong)(dong)性(xing),動(dong)(dong)環(huan)(huan)的(de)輔助密(mi)封(feng)(feng)(feng)元件(jian)保(bao)證動(dong)(dong)環(huan)(huan)與(yu)軸或軸套(tao)之間(jian)的(de)密(mi)封(feng)(feng)(feng).材料要(yao)求耐熱(re)、耐寒方面與(yu)介質接近。
(4)傳(chuan)(chuan)(chuan)(chuan)(chuan)動(dong)件:傳(chuan)(chuan)(chuan)(chuan)(chuan)動(dong)件包(bao)括傳(chuan)(chuan)(chuan)(chuan)(chuan)動(dong)銷、傳(chuan)(chuan)(chuan)(chuan)(chuan)動(dong)環(huan)、傳(chuan)(chuan)(chuan)(chuan)(chuan)動(dong)座、傳(chuan)(chuan)(chuan)(chuan)(chuan)動(dong)套(tao)、傳(chuan)(chuan)(chuan)(chuan)(chuan)動(dong)鍵、傳(chuan)(chuan)(chuan)(chuan)(chuan)動(dong)突(tu)耳或牙嵌式聯接器,其作用是將軸的轉矩傳(chuan)(chuan)(chuan)(chuan)(chuan)給動(dong)環(huan),材料要(yao)求(qiu)耐腐蝕(shi)和耐磨損。
(5)固緊(jin)件(jian):包括緊(jin)定(ding)螺釘(ding)、彈(dan)簧座、壓蓋、組裝套(tao)、軸套(tao)。起著靜、動(dong)環(huan)的(de)定(ding)位(wei)、固緊(jin)作用。要求(qiu)定(ding)位(wei)正確,保(bao)證摩擦副(fu)密封(feng)面(mian)處于正確的(de)位(wei)置(zhi),并且保(bao)持良好貼合(he)的(de)彈(dan)簧比壓,同時要求(qiu)拆裝方便(bian),容易就位(wei),能(neng)重復(fu)使用,與輔助密封(feng)配合(he)處應(ying)注意安(an)裝密封(feng)環(huan)的(de)倒(dao)角和(he)壓彈(dan)量,特(te)別注意動(dong)環(huan)密封(feng)圈與軸套(tao)配合(he)處要求(qiu)耐腐蝕和(he)耐磨損,必要時采用硬(ying)面(mian)復(fu)層。
介紹完了隴南機械密封的基本元件,接下來看看密封失效都會發生在哪些元件處。隴南機械密封的泄漏點基(ji)本上都表現(xian)在6處(chu):①動、靜(jing)(jing)環(huan)(huan)(huan)端面處(chu);②靜(jing)(jing)環(huan)(huan)(huan)與靜(jing)(jing)環(huan)(huan)(huan)盒的輔助密(mi)封處(chu);③靜(jing)(jing)環(huan)(huan)(huan)壓蓋(gai)與離心泵(beng)泵(beng)體之間的密(mi)封處(chu);④動環(huan)(huan)(huan)鑲嵌結構配合處(chu);⑤軸(zhou)(zhou)套與泵(beng)軸(zhou)(zhou)之間的密(mi)封處(chu);⑥動環(huan)(huan)(huan)與軸(zhou)(zhou)套的輔助密(mi)封處(chu)。
注意:⑤和(he)⑥只有(you)在安裝軸套(tao)時才存在。