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發布時間(jian):2021-06-01 15:18:27 人氣:183853 來(lai)源(yuan):川工密封
稱多機械密封包括壓力控制、溫度控制、流體替換(堵塞)和雜質去除系統。在稱多機械密封系(xi)(xi)統(tong)(tong)(tong)中,上述系(xi)(xi)統(tong)(tong)(tong)并不同時包(bao)括(kuo)在內。密(mi)(mi)(mi)(mi)封(feng)系(xi)(xi)統(tong)(tong)(tong)的(de)選擇主(zhu)要取決(jue)于(yu)主(zhu)密(mi)(mi)(mi)(mi)封(feng)件的(de)應(ying)用(yong)(yong)范圍。例如,如果(guo)主(zhu)密(mi)(mi)(mi)(mi)封(feng)用(yong)(yong)于(yu)高(gao)(gao)溫(wen)液體,密(mi)(mi)(mi)(mi)封(feng)系(xi)(xi)統(tong)(tong)(tong)應(ying)確(que)保降(jiang)(jiang)低主(zhu)密(mi)(mi)(mi)(mi)封(feng)的(de)環境溫(wen)度(du),即(ji)采用(yong)(yong)溫(wen)度(du)控(kong)制(zhi)系(xi)(xi)統(tong)(tong)(tong)。如果(guo)主(zhu)密(mi)(mi)(mi)(mi)封(feng)用(yong)(yong)于(yu)固(gu)體雜(za)質含(han)量高(gao)(gao)的(de)工作介質,密(mi)(mi)(mi)(mi)封(feng)系(xi)(xi)統(tong)(tong)(tong)應(ying)確(que)保在主(zhu)密(mi)(mi)(mi)(mi)封(feng)前(qian)降(jiang)(jiang)低固(gu)體雜(za)質含(han)量,即(ji)采用(yong)(yong)除雜(za)系(xi)(xi)統(tong)(tong)(tong)。在腐蝕性介質中,密(mi)(mi)(mi)(mi)封(feng)系(xi)(xi)統(tong)(tong)(tong)必(bi)須確(que)保主(zhu)密(mi)(mi)(mi)(mi)封(feng)降(jiang)(jiang)低腐蝕速率或消除腐蝕,即(ji)使用(yong)(yong)流體而不是(shi)堵塞流體系(xi)(xi)統(tong)(tong)(tong);在高(gao)(gao)壓(ya)密(mi)(mi)(mi)(mi)封(feng)裝置(zhi)中,輔(fu)助系(xi)(xi)統(tong)(tong)(tong)應(ying)確(que)保多級(ji)降(jiang)(jiang)壓(ya)和其他措施,即(ji)壓(ya)力控(kong)制(zhi)系(xi)(xi)統(tong)(tong)(tong)。
稱多機械密封的三個主(zhu)要功(gong)能如下:
1、沖洗功能,沖洗是稱多機械密封基本的功能,它直接將液體注入單面密封或雙面密封的高壓側。一般的稱多機械密封應該(gai)沖洗(xi),特別是對于輕烴泵,沖洗(xi)時(shi)達到(dao)隔離介質(zhi)、冷卻和改善(shan)潤(run)滑(hua)的(de)目的(de)。隔離介質(zhi)的(de)目的(de)可(ke)以(yi)通(tong)過將(jiang)與介質(zhi)相(xiang)容(rong)的(de)液體(ti)引入密封腔進(jin)行外部循(xun)環沖洗(xi)來實現。
2、除雜和過濾功能,密封流體中的微細固體粒子、污垢等雜質對稱多機械密封造(zao)成(cheng)的(de)(de)危害非常嚴(yan)重,可(ke)能(neng)導致密封端面的(de)(de)磨損,也(ye)可(ke)能(neng)堵塞寒冷密封系統(tong)(tong)的(de)(de)管線。密封性系統(tong)(tong)軟件具有去除殘渣(zha)(zha)、保持液體(ti)清潔(jie)的(de)(de)作用(yong)。當殘渣(zha)(zha)的(de)(de)相(xiang)(xiang)對密度(du)小于液體(ti)媒質(zhi)相(xiang)(xiang)對密度(du)時,能(neng)用(yong)過(guo)濾裝置去除殘渣(zha)(zha);而當殘渣(zha)(zha)的(de)(de)相(xiang)(xiang)對密度(du)超過(guo)液體(ti)媒質(zhi)相(xiang)(xiang)對密度(du)時,可(ke)選用(yong)旋液分離(li)設備或網(wang)式(shi)過(guo)濾器去除殘渣(zha)(zha)。
3、流體替代功能,含有固體顆粒的氣相介質和液相介質的直接密封難度很大,它們溫、毒、貴、易蒸發、易結晶。借助稱多機械密封可以用雙端稱多機械密封代(dai)替密(mi)封(feng)(feng)介質,將難(nan)以(yi)直接密(mi)封(feng)(feng)的介質轉(zhuan)化為密(mi)封(feng)(feng)潤滑性能好、清潔(jie)的密(mi)封(feng)(feng)液體介質。