輻射加熱管概況
輻(fu)(fu)射加(jia)熱管,是把(ba)電加(jia)熱元件(jian)封閉(bi)在保護套內通電發熱,由套管間接把(ba)熱量輻(fu)(fu)射給爐(lu)襯(chen)和(he)被處理工件(jian),紅外輻(fu)(fu)射加(jia)熱管廣泛應用于熱處理行(xing)業的(de)各種加(jia)熱爐(lu)中。
輻(fu)射加熱(re)(re)管使用的電(dian)(dian)(dian)熱(re)(re)合金材料應具有(you)較高的電(dian)(dian)(dian)阻率,電(dian)(dian)(dian)熱(re)(re)轉化率高。由于輻(fu)射管放置在套(tao)管內(nei),傳熱(re)(re)過程(cheng)與一般敞露型電(dian)(dian)(dian)熱(re)(re)元(yuan)(yuan)件(jian)不同,其(qi)熱(re)(re)屏(ping)蔽大,升溫(wen)(wen)過程(cheng)中必須對元(yuan)(yuan)件(jian)溫(wen)(wen)度(du)進行控制(zhi),防止元(yuan)(yuan)件(jian)超溫(wen)(wen)。輻(fu)射管封(feng)閉加熱(re)(re)時(shi),電(dian)(dian)(dian)熱(re)(re)元(yuan)(yuan)件(jian)表面溫(wen)(wen)度(du)比爐膛溫(wen)(wen)度(du)高約(yue)100℃-150℃。所(suo)以在選材時(shi)要(yao)分析爐溫(wen)(wen)、爐內(nei)氣溫(wen)(wen)氛圍,選擇(ze)正確的加熱(re)(re)材料。
目前輻射管加熱(re)管系列有鼠籠式(shi)、立帶(dai)式(shi)和螺旋式(shi)等,加熱(re)元件系采(cai)用(yong)(yong)進口(kou)或(huo)(huo)國(guo)產(chan)電阻(zu)絲、鎳鉻(ge)絲(或(huo)(huo)帶(dai))、鐵鉻(ge)鋁(絲或(huo)(huo)帶(dai)),保護管采(cai)用(yong)(yong)進口(kou)高溫(wen)(wen)合(he)金板材(cai)、耐熱(re)鋼板卷制焊接或(huo)(huo)離心(xin)鑄造而成,具(ju)有高溫(wen)(wen)抗(kang)氧化(hua)性(xing)和抗(kang)滲碳性(xing)能好、使用(yong)(yong)壽命長等特點。