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聯系客服,馬上詢價
發布時間:2021-12-20 14:58:59 人(ren)氣(qi):100005 來源:
建華機械密封是一(yi)(yi)(yi)種依(yi)靠(kao)彈(dan)性(xing)元(yuan)件對(dui)動(dong)、靜環(huan)(huan)(huan)(huan)端面(mian)(mian)密封副的(de)預(yu)緊(jin)和(he)介質壓(ya)(ya)力與(yu)彈(dan)性(xing)元(yuan)件壓(ya)(ya)力的(de)壓(ya)(ya)緊(jin)而達(da)到密封的(de)軸向端面(mian)(mian)密封裝置。動(dong)環(huan)(huan)(huan)(huan)和(he)靜環(huan)(huan)(huan)(huan)的(de)端面(mian)(mian)組(zu)成(cheng)一(yi)(yi)(yi)對(dui)摩擦(ca)副,動(dong)環(huan)(huan)(huan)(huan)靠(kao)密封室(shi)中(zhong)液體的(de)壓(ya)(ya)力使(shi)其端面(mian)(mian)壓(ya)(ya)緊(jin)在靜環(huan)(huan)(huan)(huan)端面(mian)(mian)上(shang),并(bing)在兩環(huan)(huan)(huan)(huan)端面(mian)(mian)上(shang)產生適當的(de)比壓(ya)(ya)和(he)保持一(yi)(yi)(yi)層極(ji)薄的(de)液體膜而達(da)到密封的(de)目的(de)。
常用建華機械密封結(jie)構由靜止環(靜環)、旋(xuan)轉(zhuan)(zhuan)環(動環)、彈(dan)性(xing)元(yuan)件、彈(dan)簧(huang)座(zuo)、固(gu)緊件、旋(xuan)轉(zhuan)(zhuan)環輔(fu)助密封圈和靜止環輔(fu)助密封圈等(deng)元(yuan)件組成(cheng),防轉(zhuan)(zhuan)銷固(gu)定在(zai)壓(ya)蓋上以防止靜止環轉(zhuan)(zhuan)動。這些元(yuan)件都(dou)有(you)哪些作用呢?
(1)動(dong)(dong)(dong)(dong)、靜(jing)(jing)環:保持(chi)緊密貼合組成(cheng)密封面(mian)防止介質泄(xie)漏(lou)。要(yao)求動(dong)(dong)(dong)(dong)、靜(jing)(jing)環具有(you)良(liang)好的耐磨性動(dong)(dong)(dong)(dong)環可以軸向移動(dong)(dong)(dong)(dong),自動(dong)(dong)(dong)(dong)補償密封面(mian)磨損,使之與靜(jing)(jing)環良(liang)好地貼合,靜(jing)(jing)環有(you)浮動(dong)(dong)(dong)(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建華機械密封。波(bo)形管常(chang)用于高溫、低(di)溫、強腐蝕等特殊條件(jian)。
(3)輔(fu)助密封(feng)(feng)(0形(xing)(xing)環(huan)(huan)、V形(xing)(xing)環(huan)(huan)、楔形(xing)(xing)環(huan)(huan)及(ji)其他異形(xing)(xing)密封(feng)(feng)環(huan)(huan)):主(zhu)要(yao)起到靜環(huan)(huan)和動(dong)環(huan)(huan)的(de)(de)(de)(de)密封(feng)(feng)作用(yong),同時也(ye)起到浮動(dong)性和緩(huan)沖的(de)(de)(de)(de)作用(yong)。要(yao)求靜環(huan)(huan)的(de)(de)(de)(de)輔(fu)助密封(feng)(feng)元件保證靜環(huan)(huan)與壓蓋(gai)之間的(de)(de)(de)(de)密封(feng)(feng)性,使靜環(huan)(huan)有一定的(de)(de)(de)(de)浮動(dong)性,動(dong)環(huan)(huan)的(de)(de)(de)(de)輔(fu)助密封(feng)(feng)元件保證動(dong)環(huan)(huan)與軸或軸套之間的(de)(de)(de)(de)密封(feng)(feng).材料要(yao)求耐熱、耐寒方面與介質接近。
(4)傳(chuan)動(dong)(dong)(dong)(dong)件:傳(chuan)動(dong)(dong)(dong)(dong)件包括傳(chuan)動(dong)(dong)(dong)(dong)銷、傳(chuan)動(dong)(dong)(dong)(dong)環(huan)、傳(chuan)動(dong)(dong)(dong)(dong)座、傳(chuan)動(dong)(dong)(dong)(dong)套(tao)、傳(chuan)動(dong)(dong)(dong)(dong)鍵、傳(chuan)動(dong)(dong)(dong)(dong)突耳或(huo)牙嵌式聯接器(qi),其作用是將軸的轉(zhuan)矩傳(chuan)給動(dong)(dong)(dong)(dong)環(huan),材料要求耐(nai)腐蝕(shi)和耐(nai)磨損(sun)。
(5)固緊件:包(bao)括緊定螺釘、彈(dan)簧座、壓蓋、組裝套(tao)、軸套(tao)。起(qi)著靜、動環(huan)的定位、固緊作(zuo)用(yong)。要(yao)求(qiu)定位正(zheng)確(que),保證(zheng)摩擦副密(mi)封(feng)(feng)面處于正(zheng)確(que)的位置(zhi),并且保持良(liang)好貼合(he)的彈(dan)簧比壓,同時(shi)要(yao)求(qiu)拆裝方便,容易就位,能重復使(shi)用(yong),與(yu)輔助密(mi)封(feng)(feng)配(pei)合(he)處應注(zhu)意(yi)安裝密(mi)封(feng)(feng)環(huan)的倒角和壓彈(dan)量,特別注(zhu)意(yi)動環(huan)密(mi)封(feng)(feng)圈與(yu)軸套(tao)配(pei)合(he)處要(yao)求(qiu)耐(nai)腐蝕和耐(nai)磨損,必(bi)要(yao)時(shi)采用(yong)硬面復層。
介紹完了建華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。建華機械密封的(de)泄漏點基本上都表現在6處(chu):①動、靜(jing)(jing)環(huan)端面處(chu);②靜(jing)(jing)環(huan)與靜(jing)(jing)環(huan)盒的(de)輔(fu)助密封(feng)處(chu);③靜(jing)(jing)環(huan)壓蓋與離心(xin)泵(beng)泵(beng)體之間的(de)密封(feng)處(chu);④動環(huan)鑲嵌結構配合(he)處(chu);⑤軸套與泵(beng)軸之間的(de)密封(feng)處(chu);⑥動環(huan)與軸套的(de)輔(fu)助密封(feng)處(chu)。
注意:⑤和⑥只有在安裝軸套時才存在。