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發布時間:2022-01-20 15:07:30 人氣:154409 來源(yuan):
琿春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,以保證琿春機械密封可靠、穩定地運行,輔助系統是決定琿春機械密封能否可靠、穩定(ding)運行(xing)的必(bi)要條件。
琿春機械密封輔(fu)助(zhu)系(xi)統(tong)(tong)(tong)(tong)有壓力(li)控(kong)(kong)制(zhi)、溫度(du)控(kong)(kong)制(zhi)、空氣和雜(za)質(zhi)(zhi)清除以(yi)及流體替(ti)代(dai)(阻塞)等系(xi)統(tong)(tong)(tong)(tong)。輔(fu)助(zhu)系(xi)統(tong)(tong)(tong)(tong)的(de)(de)選擇主(zhu)(zhu)(zhu)(zhu)(zhu)要取(qu)決于主(zhu)(zhu)(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)的(de)(de)使(shi)用場合。例(li)如,主(zhu)(zhu)(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)用于高(gao)溫液體,輔(fu)助(zhu)系(xi)統(tong)(tong)(tong)(tong)的(de)(de)主(zhu)(zhu)(zhu)(zhu)(zhu)要功(gong)能(neng)就是(shi)降(jiang)低(di)主(zhu)(zhu)(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)的(de)(de)環境溫度(du);主(zhu)(zhu)(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)用于固體雜(za)質(zhi)(zhi)含量高(gao)的(de)(de)工作介質(zhi)(zhi),輔(fu)助(zhu)系(xi)統(tong)(tong)(tong)(tong)就要保(bao)證(zheng)在(zai)(zai)主(zhu)(zhu)(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)前降(jiang)低(di)固體雜(za)質(zhi)(zhi)含量,在(zai)(zai)腐(fu)蝕介質(zhi)(zhi)中,輔(fu)助(zhu)系(xi)統(tong)(tong)(tong)(tong)就要保(bao)證(zheng)在(zai)(zai)主(zhu)(zhu)(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)前降(jiang)低(di)腐(fu)蝕速度(du)或消(xiao)除腐(fu)蝕(即流體替(ti)代(dai)系(xi)統(tong)(tong)(tong)(tong));在(zai)(zai)高(gao)壓密(mi)封(feng)(feng)(feng)裝置中,輔(fu)助(zhu)系(xi)統(tong)(tong)(tong)(tong)應保(bao)證(zheng)具備(bei)降(jiang)壓功(gong)能(neng),即采用壓力(li)控(kong)(kong)制(zhi)。采用密(mi)封(feng)(feng)(feng)系(xi)統(tong)(tong)(tong)(tong)可(ke)以(yi)改善主(zhu)(zhu)(zhu)(zhu)(zhu)密(mi)封(feng)(feng)(feng)的(de)(de)工作條件,使(shi)整個(ge)設備(bei)、系(xi)統(tong)(tong)(tong)(tong)減少泄漏,能(neng)保(bao)證(zheng)密(mi)封(feng)(feng)(feng)的(de)(de)工作可(ke)靠(kao)性并延長其壽命,為設備(bei)和工藝裝置安(an)全、可(ke)靠(kao)地運(yun)行提(ti)供保(bao)證(zheng)。
1、琿春機械密封系統的壓力控制
對于琿春機械密封來講,壓力、軸轉(zhuan)速(su)、溫度(du)這(zhe)三者是(shi)密(mi)切相關的,PV值大,勢必溫度(du)升高。一般(ban)泵的轉(zhuan)速(su)是(shi)固(gu)(gu)定(ding)的或在在一定(ding)范圍內(nei),其壓力也是(shi)固(gu)(gu)定(ding)在一個范圍內(nei),因此,控制(zhi)密(mi)封(feng)的環境壓力是(shi)必須的。
在工(gong)藝條件允許(xu)的(de)(de)(de)情況下,采(cai)(cai)用(yong)平衡(heng)(heng)型(xing)密(mi)(mi)(mi)封(feng)(feng)(feng)是減少密(mi)(mi)(mi)封(feng)(feng)(feng)面(mian)比壓(ya)的(de)(de)(de)最好(hao)辦(ban)法。在泵本身(shen)方面(mian),可以采(cai)(cai)用(yong)下列辦(ban)法來降(jiang)低軸(zhou)(zhou)封(feng)(feng)(feng)前的(de)(de)(de)壓(ya)力,從而減輕(qing)軸(zhou)(zhou)封(feng)(feng)(feng)載(zai)荷:葉(xie)(xie)輪(lun)開平衡(heng)(heng)孔;葉(xie)(xie)輪(lun)帶(dai)背葉(xie)(xie)片;加副(fu)葉(xie)(xie)輪(lun)等。未了(le)減輕(qing)軸(zhou)(zhou)封(feng)(feng)(feng)載(zai)荷,還可以在密(mi)(mi)(mi)封(feng)(feng)(feng)前采(cai)(cai)用(yong)迷宮(gong)密(mi)(mi)(mi)封(feng)(feng)(feng)、螺旋密(mi)(mi)(mi)封(feng)(feng)(feng)、節流套(tao)密(mi)(mi)(mi)封(feng)(feng)(feng)等以降(jiang)低密(mi)(mi)(mi)封(feng)(feng)(feng)前的(de)(de)(de)壓(ya)力。為了(le)良好(hao)地(di)分配壓(ya)力,還可以采(cai)(cai)用(yong)串(chuan)聯式密(mi)(mi)(mi)封(feng)(feng)(feng)。
2、琿春機械密封溫度控制系統
這是琿春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琿春機械密封可靠(kao)工作,因此,必(bi)須進行溫(wen)度控制。
溫(wen)度(du)控制不僅對密封有(you)利,而且對其他部分也是必(bi)須的,這可以防止:
a.摩擦副密封環熱變形和(he)碳石墨浸漬劑熔化(hua);
b.密封面(mian)間液膜(mo)黏(nian)度變化和液膜(mo)汽化;
c.輔助密封元件失效,如橡膠密封圈軟化(hua)、老化(hua)和分解;
d.加速(su)腐(fu)蝕介質(zhi)對零件(jian)的腐(fu)蝕;
e.有些介質易發生聚合或分解(jie)等。
琿春機械密封最常用的溫(wen)度(du)控制(zhi)方法是沖(chong)洗、冷卻循環等(deng)。