掃一掃,加微信
聯系客服,馬上詢價
發布時間:2021-06-01 15:16:25 人氣:182315 來源(yuan):川(chuan)工密封(feng)
上饒機械密封是一種依靠彈(dan)(dan)性元(yuan)(yuan)件(jian)對動(dong)、靜環(huan)端面(mian)(mian)(mian)密(mi)封(feng)(feng)(feng)副的(de)(de)(de)預(yu)緊(jin)(jin)和介(jie)質壓(ya)(ya)(ya)力(li)與彈(dan)(dan)性元(yuan)(yuan)件(jian)壓(ya)(ya)(ya)力(li)的(de)(de)(de)壓(ya)(ya)(ya)緊(jin)(jin)而達到(dao)密(mi)封(feng)(feng)(feng)的(de)(de)(de)軸向(xiang)端面(mian)(mian)(mian)密(mi)封(feng)(feng)(feng)裝置。動(dong)環(huan)和靜環(huan)的(de)(de)(de)端面(mian)(mian)(mian)組成一對摩擦副,動(dong)環(huan)靠密(mi)封(feng)(feng)(feng)室中液(ye)體的(de)(de)(de)壓(ya)(ya)(ya)力(li)使其端面(mian)(mian)(mian)壓(ya)(ya)(ya)緊(jin)(jin)在靜環(huan)端面(mian)(mian)(mian)上,并(bing)在兩(liang)環(huan)端面(mian)(mian)(mian)上產生適當的(de)(de)(de)比(bi)壓(ya)(ya)(ya)和保持一層極薄的(de)(de)(de)液(ye)體膜而達到(dao)密(mi)封(feng)(feng)(feng)的(de)(de)(de)目的(de)(de)(de)。
常用上饒機械密封結構由靜(jing)止(zhi)環(huan)(huan)(huan)(huan)(靜(jing)環(huan)(huan)(huan)(huan))、旋轉(zhuan)環(huan)(huan)(huan)(huan)(動(dong)環(huan)(huan)(huan)(huan))、彈(dan)(dan)性(xing)元(yuan)(yuan)件(jian)、彈(dan)(dan)簧座(zuo)、固(gu)緊件(jian)、旋轉(zhuan)環(huan)(huan)(huan)(huan)輔(fu)助密封圈和靜(jing)止(zhi)環(huan)(huan)(huan)(huan)輔(fu)助密封圈等元(yuan)(yuan)件(jian)組成(cheng),防轉(zhuan)銷固(gu)定(ding)在(zai)壓蓋上以防止(zhi)靜(jing)止(zhi)環(huan)(huan)(huan)(huan)轉(zhuan)動(dong)。這些(xie)元(yuan)(yuan)件(jian)都(dou)有哪些(xie)作用(yong)呢(ni)?
(1)動(dong)、靜環:保持緊密貼合組成密封面(mian)防止(zhi)介質泄(xie)漏。要求動(dong)、靜環具有良好的耐磨性(xing)動(dong)環可以軸向移動(dong),自動(dong)補償密封面(mian)磨損,使之與(yu)靜環良好地貼合,靜環有浮動(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上饒機械密封。波(bo)形(xing)管(guan)常用于(yu)高溫(wen)、低溫(wen)、強腐蝕等(deng)特殊(shu)條(tiao)件。
(3)輔助密(mi)(mi)封(0形環(huan)(huan)、V形環(huan)(huan)、楔(xie)形環(huan)(huan)及(ji)其他異形密(mi)(mi)封環(huan)(huan)):主要起到靜(jing)環(huan)(huan)和(he)動(dong)環(huan)(huan)的(de)(de)(de)密(mi)(mi)封作用(yong),同時也起到浮動(dong)性和(he)緩(huan)沖的(de)(de)(de)作用(yong)。要求(qiu)靜(jing)環(huan)(huan)的(de)(de)(de)輔助密(mi)(mi)封元(yuan)件保證靜(jing)環(huan)(huan)與(yu)壓蓋之間(jian)的(de)(de)(de)密(mi)(mi)封性,使靜(jing)環(huan)(huan)有一(yi)定的(de)(de)(de)浮動(dong)性,動(dong)環(huan)(huan)的(de)(de)(de)輔助密(mi)(mi)封元(yuan)件保證動(dong)環(huan)(huan)與(yu)軸或(huo)軸套之間(jian)的(de)(de)(de)密(mi)(mi)封.材料要求(qiu)耐熱、耐寒方(fang)面(mian)與(yu)介質接近(jin)。
(4)傳(chuan)(chuan)動(dong)(dong)件:傳(chuan)(chuan)動(dong)(dong)件包括傳(chuan)(chuan)動(dong)(dong)銷、傳(chuan)(chuan)動(dong)(dong)環、傳(chuan)(chuan)動(dong)(dong)座(zuo)、傳(chuan)(chuan)動(dong)(dong)套、傳(chuan)(chuan)動(dong)(dong)鍵、傳(chuan)(chuan)動(dong)(dong)突(tu)耳或牙嵌(qian)式聯(lian)接器,其作用是將(jiang)軸的轉矩傳(chuan)(chuan)給(gei)動(dong)(dong)環,材料(liao)要求(qiu)耐腐蝕(shi)和(he)耐磨損。
(5)固緊(jin)件:包括緊(jin)定(ding)螺(luo)釘(ding)、彈簧座、壓(ya)(ya)蓋、組(zu)裝(zhuang)套、軸套。起(qi)著靜(jing)、動環(huan)的定(ding)位(wei)(wei)、固緊(jin)作用(yong)。要(yao)求(qiu)定(ding)位(wei)(wei)正(zheng)確,保證摩擦副密(mi)(mi)封(feng)(feng)面處于正(zheng)確的位(wei)(wei)置,并(bing)且(qie)保持良好貼合的彈簧比壓(ya)(ya),同(tong)時(shi)要(yao)求(qiu)拆(chai)裝(zhuang)方便,容易就位(wei)(wei),能重復(fu)使(shi)用(yong),與(yu)輔助密(mi)(mi)封(feng)(feng)配合處應注意安裝(zhuang)密(mi)(mi)封(feng)(feng)環(huan)的倒角(jiao)和壓(ya)(ya)彈量(liang),特別注意動環(huan)密(mi)(mi)封(feng)(feng)圈與(yu)軸套配合處要(yao)求(qiu)耐腐蝕和耐磨損(sun),必(bi)要(yao)時(shi)采用(yong)硬面復(fu)層。
介紹完了上饒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。上饒機械密封的(de)泄漏點基本上都表現(xian)在(zai)6處(chu)(chu):①動(dong)、靜(jing)環(huan)端(duan)面處(chu)(chu);②靜(jing)環(huan)與(yu)靜(jing)環(huan)盒(he)的(de)輔助(zhu)密封(feng)(feng)處(chu)(chu);③靜(jing)環(huan)壓蓋與(yu)離心泵泵體之間(jian)的(de)密封(feng)(feng)處(chu)(chu);④動(dong)環(huan)鑲(xiang)嵌結構(gou)配合處(chu)(chu);⑤軸套(tao)(tao)與(yu)泵軸之間(jian)的(de)密封(feng)(feng)處(chu)(chu);⑥動(dong)環(huan)與(yu)軸套(tao)(tao)的(de)輔助(zhu)密封(feng)(feng)處(chu)(chu)。
注意:⑤和⑥只有在(zai)安裝軸套時才存在(zai)。