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發布(bu)時間:2022-01-20 15:07:30 人(ren)氣:143624 來源:
措美機械密封裝置主要有主密封和與其配套的輔助系統組成。主密封作用是密封工作介質,而輔助系統是為主密封提供良好的工作環境,以保證措美機械密封可靠、穩定地運行,輔助系統是決定措美機械密封能否可靠、穩定運行的必要條件。
措美機械密封輔(fu)(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)有(you)壓力控制(zhi)、溫(wen)度控制(zhi)、空氣和(he)雜(za)質(zhi)(zhi)(zhi)清除以及流體(ti)(ti)替代(dai)(阻(zu)塞)等系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。輔(fu)(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)(de)(de)選(xuan)擇(ze)主(zhu)(zhu)要(yao)取(qu)決于主(zhu)(zhu)密(mi)(mi)封(feng)的(de)(de)(de)使(shi)(shi)用(yong)(yong)場合。例(li)如,主(zhu)(zhu)密(mi)(mi)封(feng)用(yong)(yong)于高溫(wen)液體(ti)(ti),輔(fu)(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的(de)(de)(de)主(zhu)(zhu)要(yao)功(gong)(gong)能(neng)就是降(jiang)低(di)主(zhu)(zhu)密(mi)(mi)封(feng)的(de)(de)(de)環境溫(wen)度;主(zhu)(zhu)密(mi)(mi)封(feng)用(yong)(yong)于固體(ti)(ti)雜(za)質(zhi)(zhi)(zhi)含(han)量高的(de)(de)(de)工作介質(zhi)(zhi)(zhi),輔(fu)(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)就要(yao)保證(zheng)在(zai)主(zhu)(zhu)密(mi)(mi)封(feng)前降(jiang)低(di)固體(ti)(ti)雜(za)質(zhi)(zhi)(zhi)含(han)量,在(zai)腐蝕介質(zhi)(zhi)(zhi)中,輔(fu)(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)就要(yao)保證(zheng)在(zai)主(zhu)(zhu)密(mi)(mi)封(feng)前降(jiang)低(di)腐蝕速(su)度或消除腐蝕(即流體(ti)(ti)替代(dai)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong));在(zai)高壓密(mi)(mi)封(feng)裝置(zhi)中,輔(fu)(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應(ying)保證(zheng)具備(bei)降(jiang)壓功(gong)(gong)能(neng),即采(cai)用(yong)(yong)壓力控制(zhi)。采(cai)用(yong)(yong)密(mi)(mi)封(feng)系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)可(ke)(ke)以改善主(zhu)(zhu)密(mi)(mi)封(feng)的(de)(de)(de)工作條件,使(shi)(shi)整個(ge)設備(bei)、系(xi)(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)減少泄漏,能(neng)保證(zheng)密(mi)(mi)封(feng)的(de)(de)(de)工作可(ke)(ke)靠(kao)性并延長其壽命,為設備(bei)和(he)工藝裝置(zhi)安(an)全、可(ke)(ke)靠(kao)地運行提供(gong)保證(zheng)。
1、措美機械密封系統的壓力控制
對于措美機械密封來講,壓力(li)、軸轉(zhuan)速、溫度這三(san)者是(shi)密(mi)切(qie)相關的(de),PV值大,勢(shi)必溫度升高(gao)。一般泵的(de)轉(zhuan)速是(shi)固(gu)定的(de)或在在一定范(fan)(fan)圍內(nei),其壓力(li)也是(shi)固(gu)定在一個(ge)范(fan)(fan)圍內(nei),因此,控制密(mi)封的(de)環境壓力(li)是(shi)必須的(de)。
在(zai)工(gong)藝(yi)條(tiao)件允許的情況下(xia),采(cai)(cai)用(yong)平衡型密(mi)封(feng)(feng)(feng)(feng)是減少(shao)密(mi)封(feng)(feng)(feng)(feng)面比壓的最好(hao)辦法(fa)。在(zai)泵本身方(fang)面,可以采(cai)(cai)用(yong)下(xia)列辦法(fa)來降低(di)軸(zhou)封(feng)(feng)(feng)(feng)前(qian)的壓力,從(cong)而減輕(qing)軸(zhou)封(feng)(feng)(feng)(feng)載(zai)荷:葉輪開平衡孔(kong);葉輪帶背(bei)葉片;加(jia)副(fu)葉輪等(deng)。未了(le)減輕(qing)軸(zhou)封(feng)(feng)(feng)(feng)載(zai)荷,還可以在(zai)密(mi)封(feng)(feng)(feng)(feng)前(qian)采(cai)(cai)用(yong)迷宮密(mi)封(feng)(feng)(feng)(feng)、螺旋密(mi)封(feng)(feng)(feng)(feng)、節(jie)流套密(mi)封(feng)(feng)(feng)(feng)等(deng)以降低(di)密(mi)封(feng)(feng)(feng)(feng)前(qian)的壓力。為了(le)良好(hao)地分配壓力,還可以采(cai)(cai)用(yong)串聯式(shi)密(mi)封(feng)(feng)(feng)(feng)。
2、措美機械密封溫度控制系統
這是措美機械密封主要的系統。密封面的摩擦和機械攪拌會不斷產生熱量;泵送的高溫介質對密封的影響。這些熱量必須及時排除才能保證措美機械密封可靠(kao)工(gong)作,因此,必須進行溫度控(kong)制。
溫(wen)度控制不(bu)僅對密封有利,而(er)且對其他部分也是必須的,這可以防止:
a.摩(mo)擦(ca)副密封環熱變形和(he)碳石(shi)墨浸(jin)漬劑(ji)熔化;
b.密封面間液(ye)膜(mo)黏度變化(hua)(hua)和(he)液(ye)膜(mo)汽化(hua)(hua);
c.輔助密封元(yuan)件失效,如橡(xiang)膠密封圈軟化、老化和分解;
d.加速腐蝕(shi)(shi)介(jie)質對(dui)零件的腐蝕(shi)(shi);
e.有些介質(zhi)易發生(sheng)聚合(he)或分解(jie)等。
措美機械密封最常(chang)用的溫度控制方法是(shi)沖洗、冷卻循環(huan)等。