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發布時間:2021-12-16 11:39:59 人氣:100411 來源(yuan):
瑪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。在瑪多機械密封系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)中(zhong),上述系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)并不同(tong)時包括(kuo)在(zai)內。密(mi)封(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)的(de)選擇(ze)主要(yao)取決于(yu)主密(mi)封(feng)件的(de)應用(yong)范(fan)圍(wei)。例如,如果主密(mi)封(feng)用(yong)于(yu)高(gao)(gao)溫(wen)液體,密(mi)封(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)應確(que)保(bao)(bao)(bao)降(jiang)低主密(mi)封(feng)的(de)環境(jing)溫(wen)度,即(ji)(ji)采用(yong)溫(wen)度控(kong)(kong)制系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)。如果主密(mi)封(feng)用(yong)于(yu)固(gu)(gu)體雜(za)質含量(liang)高(gao)(gao)的(de)工作(zuo)介質,密(mi)封(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)應確(que)保(bao)(bao)(bao)在(zai)主密(mi)封(feng)前降(jiang)低固(gu)(gu)體雜(za)質含量(liang),即(ji)(ji)采用(yong)除(chu)雜(za)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)。在(zai)腐(fu)(fu)蝕(shi)性介質中(zhong),密(mi)封(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)必須確(que)保(bao)(bao)(bao)主密(mi)封(feng)降(jiang)低腐(fu)(fu)蝕(shi)速率或消除(chu)腐(fu)(fu)蝕(shi),即(ji)(ji)使用(yong)流(liu)體而不是堵塞流(liu)體系(xi)(xi)(xi)(xi)統(tong)(tong)(tong);在(zai)高(gao)(gao)壓(ya)密(mi)封(feng)裝置中(zhong),輔助系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)應確(que)保(bao)(bao)(bao)多級降(jiang)壓(ya)和(he)其他(ta)措施,即(ji)(ji)壓(ya)力控(kong)(kong)制系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)。
瑪多機械密封的三個主要功(gong)能如下:
1、沖洗功能,沖洗是瑪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。一般的瑪多機械密封應該沖(chong)洗,特別是對于輕烴泵,沖(chong)洗時達(da)到隔離介質(zhi)、冷卻和(he)改善潤滑的(de)(de)目的(de)(de)。隔離介質(zhi)的(de)(de)目的(de)(de)可以通過將與介質(zhi)相容(rong)的(de)(de)液體引(yin)入密封腔(qiang)進行外部循環(huan)沖(chong)洗來實(shi)現。
2、除雜和過濾功能,密封流體中的微細固體粒子、污垢等雜質對瑪多機械密封造成(cheng)的(de)(de)(de)危(wei)害非常嚴重,可(ke)(ke)能(neng)導(dao)致密(mi)(mi)封(feng)端面的(de)(de)(de)磨損,也可(ke)(ke)能(neng)堵(du)塞寒(han)冷密(mi)(mi)封(feng)系(xi)(xi)統的(de)(de)(de)管線。密(mi)(mi)封(feng)性(xing)系(xi)(xi)統軟(ruan)件具有(you)去(qu)除殘渣(zha)(zha)、保持(chi)液(ye)體清(qing)潔的(de)(de)(de)作用(yong)。當殘渣(zha)(zha)的(de)(de)(de)相(xiang)對(dui)密(mi)(mi)度(du)(du)小于(yu)液(ye)體媒(mei)質相(xiang)對(dui)密(mi)(mi)度(du)(du)時,能(neng)用(yong)過(guo)濾(lv)(lv)裝置去(qu)除殘渣(zha)(zha);而當殘渣(zha)(zha)的(de)(de)(de)相(xiang)對(dui)密(mi)(mi)度(du)(du)超過(guo)液(ye)體媒(mei)質相(xiang)對(dui)密(mi)(mi)度(du)(du)時,可(ke)(ke)選(xuan)用(yong)旋液(ye)分離設備或網式(shi)過(guo)濾(lv)(lv)器去(qu)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。借助瑪多機械密封可以用雙端瑪多機械密封代替密(mi)封介(jie)質(zhi),將難以直接密(mi)封的介(jie)質(zhi)轉(zhuan)化為密(mi)封潤滑性(xing)能好、清潔的密(mi)封液體介(jie)質(zhi)。