掃一掃,加微信
聯系客服,馬上詢價
發(fa)布時(shi)間:2022-01-20 15:07:30 人(ren)氣:143836 來源:
定襄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,以保證定襄機械密封可靠、穩定地運行,輔助系統是決定定襄機械密封能否(fou)可靠、穩定運(yun)行的必要條件(jian)。
定襄機械密封輔(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)有(you)壓(ya)(ya)力(li)控(kong)制(zhi)、溫度(du)控(kong)制(zhi)、空氣和(he)雜質(zhi)清除以(yi)及流(liu)體(ti)(ti)替代(阻塞)等系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。輔(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的選擇(ze)主(zhu)要取決(jue)于主(zhu)密(mi)(mi)封(feng)(feng)(feng)的使(shi)(shi)用場合。例如,主(zhu)密(mi)(mi)封(feng)(feng)(feng)用于高(gao)(gao)溫液體(ti)(ti),輔(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的主(zhu)要功能就是(shi)降低主(zhu)密(mi)(mi)封(feng)(feng)(feng)的環境溫度(du);主(zhu)密(mi)(mi)封(feng)(feng)(feng)用于固體(ti)(ti)雜質(zhi)含(han)量高(gao)(gao)的工作介質(zhi),輔(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)就要保(bao)(bao)證(zheng)(zheng)在(zai)主(zhu)密(mi)(mi)封(feng)(feng)(feng)前(qian)(qian)降低固體(ti)(ti)雜質(zhi)含(han)量,在(zai)腐(fu)蝕介質(zhi)中(zhong),輔(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)就要保(bao)(bao)證(zheng)(zheng)在(zai)主(zhu)密(mi)(mi)封(feng)(feng)(feng)前(qian)(qian)降低腐(fu)蝕速度(du)或消除腐(fu)蝕(即流(liu)體(ti)(ti)替代系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong));在(zai)高(gao)(gao)壓(ya)(ya)密(mi)(mi)封(feng)(feng)(feng)裝(zhuang)置(zhi)中(zhong),輔(fu)助(zhu)(zhu)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應保(bao)(bao)證(zheng)(zheng)具備(bei)降壓(ya)(ya)功能,即采(cai)用壓(ya)(ya)力(li)控(kong)制(zhi)。采(cai)用密(mi)(mi)封(feng)(feng)(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)可(ke)以(yi)改善主(zhu)密(mi)(mi)封(feng)(feng)(feng)的工作條件(jian),使(shi)(shi)整(zheng)個設備(bei)、系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)減少泄漏,能保(bao)(bao)證(zheng)(zheng)密(mi)(mi)封(feng)(feng)(feng)的工作可(ke)靠性并延(yan)長其(qi)壽(shou)命,為(wei)設備(bei)和(he)工藝裝(zhuang)置(zhi)安(an)全、可(ke)靠地運行(xing)提供(gong)保(bao)(bao)證(zheng)(zheng)。
1、定襄機械密封系統的壓力控制
對于定襄機械密封來講,壓力(li)、軸轉速、溫度這三者(zhe)是密(mi)切(qie)相(xiang)關(guan)的,PV值(zhi)大,勢必溫度升高。一(yi)般(ban)泵的轉速是固(gu)定的或在在一(yi)定范(fan)圍(wei)內(nei),其壓力(li)也是固(gu)定在一(yi)個范(fan)圍(wei)內(nei),因此,控制密(mi)封的環境壓力(li)是必須(xu)的。
在(zai)工藝(yi)條(tiao)件允許(xu)的(de)(de)情況(kuang)下,采(cai)(cai)用(yong)平衡型密(mi)封(feng)是減少密(mi)封(feng)面(mian)比(bi)壓的(de)(de)最好(hao)辦法(fa)。在(zai)泵(beng)本身方(fang)面(mian),可以(yi)采(cai)(cai)用(yong)下列辦法(fa)來降(jiang)低(di)軸封(feng)前(qian)的(de)(de)壓力(li),從而減輕軸封(feng)載荷:葉輪(lun)(lun)開(kai)平衡孔;葉輪(lun)(lun)帶背葉片;加副葉輪(lun)(lun)等(deng)(deng)。未了(le)減輕軸封(feng)載荷,還可以(yi)在(zai)密(mi)封(feng)前(qian)采(cai)(cai)用(yong)迷宮密(mi)封(feng)、螺旋密(mi)封(feng)、節(jie)流套密(mi)封(feng)等(deng)(deng)以(yi)降(jiang)低(di)密(mi)封(feng)前(qian)的(de)(de)壓力(li)。為了(le)良(liang)好(hao)地(di)分(fen)配壓力(li),還可以(yi)采(cai)(cai)用(yong)串聯(lian)式密(mi)封(feng)。
2、定襄機械密封溫度控制系統
這是定襄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定襄機械密封可靠工作(zuo),因此,必(bi)須進(jin)行溫度控制。
溫度控制(zhi)不(bu)僅對(dui)(dui)密封(feng)有利,而且對(dui)(dui)其他部(bu)分也是必(bi)須(xu)的,這可以防止(zhi):
a.摩(mo)擦(ca)副密封環(huan)熱(re)變形(xing)和碳石墨浸漬劑熔(rong)化;
b.密封(feng)面間(jian)液膜黏度變化和液膜汽(qi)化;
c.輔助密封元件失效,如橡(xiang)膠密封圈軟化(hua)、老(lao)化(hua)和分解;
d.加速腐蝕介質(zhi)對零(ling)件(jian)的腐蝕;
e.有些(xie)介質易發生聚合或分解等。
定襄機械密封最常用的(de)溫度控制方(fang)法是(shi)沖洗、冷卻循環等(deng)。