掃一掃,加微信
聯系客服,馬上詢價
發布時間:2021-12-20 14:58:59 人氣(qi):99507 來源(yuan):
湟中機械密封是(shi)一種依靠彈性元件對(dui)動、靜環(huan)(huan)(huan)(huan)端(duan)面(mian)密封(feng)副的(de)(de)預緊和(he)介(jie)質壓(ya)(ya)(ya)力(li)與(yu)彈性元件壓(ya)(ya)(ya)力(li)的(de)(de)壓(ya)(ya)(ya)緊而(er)(er)達到密封(feng)的(de)(de)軸向端(duan)面(mian)密封(feng)裝置。動環(huan)(huan)(huan)(huan)和(he)靜環(huan)(huan)(huan)(huan)的(de)(de)端(duan)面(mian)組成一對(dui)摩擦(ca)副,動環(huan)(huan)(huan)(huan)靠密封(feng)室中(zhong)液體(ti)的(de)(de)壓(ya)(ya)(ya)力(li)使(shi)其端(duan)面(mian)壓(ya)(ya)(ya)緊在(zai)靜環(huan)(huan)(huan)(huan)端(duan)面(mian)上(shang)(shang),并在(zai)兩環(huan)(huan)(huan)(huan)端(duan)面(mian)上(shang)(shang)產生適當的(de)(de)比壓(ya)(ya)(ya)和(he)保持一層極薄的(de)(de)液體(ti)膜而(er)(er)達到密封(feng)的(de)(de)目(mu)的(de)(de)。
常用湟中機械密封結構由靜止(zhi)(zhi)環(靜環)、旋轉(zhuan)環(動環)、彈(dan)性元(yuan)(yuan)件(jian)(jian)、彈(dan)簧座(zuo)、固(gu)緊件(jian)(jian)、旋轉(zhuan)環輔(fu)助(zhu)密封(feng)(feng)圈(quan)和靜止(zhi)(zhi)環輔(fu)助(zhu)密封(feng)(feng)圈(quan)等元(yuan)(yuan)件(jian)(jian)組成(cheng),防轉(zhuan)銷(xiao)固(gu)定(ding)在壓蓋上以防止(zhi)(zhi)靜止(zhi)(zhi)環轉(zhuan)動。這些(xie)元(yuan)(yuan)件(jian)(jian)都有哪(na)些(xie)作用呢?
(1)動(dong)(dong)(dong)、靜環(huan):保持緊密貼合(he)組成密封面防止介(jie)質泄漏。要求動(dong)(dong)(dong)、靜環(huan)具有良好(hao)的耐(nai)磨性(xing)動(dong)(dong)(dong)環(huan)可以(yi)軸向移動(dong)(dong)(dong),自(zi)動(dong)(dong)(dong)補償密封面磨損(sun),使(shi)之與靜環(huan)良好(hao)地貼合(he),靜環(huan)有浮(fu)動(dong)(dong)(dong)性(xing),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湟中機械密封。波形管常用于高溫、低(di)溫、強腐蝕(shi)等特殊條件。
(3)輔助密(mi)(mi)封(feng)(0形(xing)(xing)環(huan)(huan)(huan)、V形(xing)(xing)環(huan)(huan)(huan)、楔形(xing)(xing)環(huan)(huan)(huan)及其他異形(xing)(xing)密(mi)(mi)封(feng)環(huan)(huan)(huan)):主要起到靜(jing)環(huan)(huan)(huan)和動環(huan)(huan)(huan)的(de)(de)(de)(de)密(mi)(mi)封(feng)作用(yong),同時也起到浮動性(xing)和緩沖的(de)(de)(de)(de)作用(yong)。要求靜(jing)環(huan)(huan)(huan)的(de)(de)(de)(de)輔助密(mi)(mi)封(feng)元件(jian)保證靜(jing)環(huan)(huan)(huan)與壓蓋之間的(de)(de)(de)(de)密(mi)(mi)封(feng)性(xing),使(shi)靜(jing)環(huan)(huan)(huan)有一定的(de)(de)(de)(de)浮動性(xing),動環(huan)(huan)(huan)的(de)(de)(de)(de)輔助密(mi)(mi)封(feng)元件(jian)保證動環(huan)(huan)(huan)與軸或(huo)軸套之間的(de)(de)(de)(de)密(mi)(mi)封(feng).材(cai)料要求耐熱、耐寒方面(mian)與介(jie)質(zhi)接近。
(4)傳(chuan)(chuan)(chuan)動(dong)(dong)件(jian):傳(chuan)(chuan)(chuan)動(dong)(dong)件(jian)包括傳(chuan)(chuan)(chuan)動(dong)(dong)銷、傳(chuan)(chuan)(chuan)動(dong)(dong)環、傳(chuan)(chuan)(chuan)動(dong)(dong)座(zuo)、傳(chuan)(chuan)(chuan)動(dong)(dong)套、傳(chuan)(chuan)(chuan)動(dong)(dong)鍵(jian)、傳(chuan)(chuan)(chuan)動(dong)(dong)突耳或牙嵌式聯接器,其作用是將軸的轉矩(ju)傳(chuan)(chuan)(chuan)給動(dong)(dong)環,材料要求耐(nai)腐蝕和耐(nai)磨損。
(5)固(gu)緊件:包括緊定(ding)螺釘、彈(dan)簧(huang)座、壓(ya)蓋、組裝套、軸套。起著靜、動(dong)環的(de)(de)定(ding)位、固(gu)緊作用。要求定(ding)位正確(que),保證摩擦副(fu)密(mi)(mi)封面(mian)(mian)處(chu)于正確(que)的(de)(de)位置,并(bing)且保持良好(hao)貼合(he)(he)的(de)(de)彈(dan)簧(huang)比壓(ya),同時要求拆裝方便,容易就位,能重(zhong)復(fu)使用,與輔(fu)助密(mi)(mi)封配(pei)合(he)(he)處(chu)應注(zhu)意安(an)裝密(mi)(mi)封環的(de)(de)倒角和壓(ya)彈(dan)量,特別注(zhu)意動(dong)環密(mi)(mi)封圈與軸套配(pei)合(he)(he)處(chu)要求耐(nai)腐蝕和耐(nai)磨損,必要時采(cai)用硬面(mian)(mian)復(fu)層。
介紹完了湟中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。湟中機械密封的泄(xie)漏點基本上都表(biao)現(xian)在(zai)6處(chu)(chu):①動(dong)、靜環(huan)端(duan)面(mian)處(chu)(chu);②靜環(huan)與靜環(huan)盒的輔助密封處(chu)(chu);③靜環(huan)壓蓋(gai)與離(li)心泵(beng)泵(beng)體之(zhi)間的密封處(chu)(chu);④動(dong)環(huan)鑲(xiang)嵌結構配合處(chu)(chu);⑤軸(zhou)套與泵(beng)軸(zhou)之(zhi)間的密封處(chu)(chu);⑥動(dong)環(huan)與軸(zhou)套的輔助密封處(chu)(chu)。
注意:⑤和(he)⑥只(zhi)有在安裝軸套時才存在。