輻射加熱管概況
輻(fu)射加熱管(guan)(guan),是把(ba)電加熱元件(jian)封(feng)閉(bi)在保護(hu)套內(nei)通電發熱,由套管(guan)(guan)間接(jie)把(ba)熱量輻(fu)射給爐襯(chen)和(he)被處理(li)工件(jian),紅外輻(fu)射加熱管(guan)(guan)廣泛應(ying)用于熱處理(li)行業的各種(zhong)加熱爐中。
輻(fu)射加熱(re)管(guan)(guan)使用的(de)(de)電(dian)(dian)熱(re)合(he)金材料應具有較高的(de)(de)電(dian)(dian)阻(zu)率,電(dian)(dian)熱(re)轉化(hua)率高。由于(yu)輻(fu)射管(guan)(guan)放置在(zai)套(tao)管(guan)(guan)內,傳熱(re)過(guo)程(cheng)與一般敞(chang)露型電(dian)(dian)熱(re)元(yuan)件(jian)(jian)不(bu)同,其熱(re)屏蔽大(da),升溫(wen)(wen)(wen)過(guo)程(cheng)中(zhong)必(bi)須對元(yuan)件(jian)(jian)溫(wen)(wen)(wen)度(du)進行控(kong)制(zhi),防止元(yuan)件(jian)(jian)超溫(wen)(wen)(wen)。輻(fu)射管(guan)(guan)封閉加熱(re)時,電(dian)(dian)熱(re)元(yuan)件(jian)(jian)表面(mian)溫(wen)(wen)(wen)度(du)比(bi)爐(lu)膛溫(wen)(wen)(wen)度(du)高約(yue)100℃-150℃。所以(yi)在(zai)選材時要分析爐(lu)溫(wen)(wen)(wen)、爐(lu)內氣溫(wen)(wen)(wen)氛圍,選擇(ze)正確的(de)(de)加熱(re)材料。
目(mu)前輻(fu)射管(guan)加熱(re)管(guan)系列有鼠籠(long)式、立(li)帶(dai)式和螺旋(xuan)式等(deng),加熱(re)元件系采用(yong)進口或(huo)國產電阻絲、鎳鉻(ge)絲(或(huo)帶(dai))、鐵鉻(ge)鋁(絲或(huo)帶(dai)),保護管(guan)采用(yong)進口高溫合金板材、耐熱(re)鋼板卷制焊接(jie)或(huo)離心鑄造而成,具(ju)有高溫抗氧(yang)化(hua)性和抗滲碳性能好(hao)、使用(yong)壽(shou)命長等(deng)特點。