輻射加熱管概況
輻(fu)射加(jia)熱管,是把電加(jia)熱元件封閉在(zai)保(bao)護套(tao)內通電發熱,由套(tao)管間(jian)接把熱量(liang)輻(fu)射給爐襯和被處理工件,紅外輻(fu)射加(jia)熱管廣泛應用于熱處理行業的各種加(jia)熱爐中。
輻射加熱(re)(re)(re)(re)管使用(yong)的(de)電(dian)(dian)熱(re)(re)(re)(re)合(he)金材(cai)料應具有較高的(de)電(dian)(dian)阻率,電(dian)(dian)熱(re)(re)(re)(re)轉化率高。由于輻射管放置在套管內(nei)(nei),傳熱(re)(re)(re)(re)過(guo)程與一般敞露型電(dian)(dian)熱(re)(re)(re)(re)元(yuan)件(jian)(jian)不同,其熱(re)(re)(re)(re)屏(ping)蔽大,升溫(wen)(wen)過(guo)程中必須(xu)對元(yuan)件(jian)(jian)溫(wen)(wen)度(du)進行控制(zhi),防(fang)止元(yuan)件(jian)(jian)超溫(wen)(wen)。輻射管封閉(bi)加熱(re)(re)(re)(re)時,電(dian)(dian)熱(re)(re)(re)(re)元(yuan)件(jian)(jian)表面溫(wen)(wen)度(du)比爐(lu)膛溫(wen)(wen)度(du)高約(yue)100℃-150℃。所(suo)以在選(xuan)(xuan)材(cai)時要分(fen)析爐(lu)溫(wen)(wen)、爐(lu)內(nei)(nei)氣溫(wen)(wen)氛圍,選(xuan)(xuan)擇正確的(de)加熱(re)(re)(re)(re)材(cai)料。
目前輻射管加(jia)熱(re)管系列有鼠籠(long)式(shi)、立帶(dai)式(shi)和螺旋式(shi)等,加(jia)熱(re)元件系采(cai)(cai)用(yong)進(jin)口(kou)或(huo)國產電阻絲、鎳鉻(ge)絲(或(huo)帶(dai))、鐵鉻(ge)鋁(絲或(huo)帶(dai)),保護管采(cai)(cai)用(yong)進(jin)口(kou)高溫合金板(ban)材、耐熱(re)鋼(gang)板(ban)卷制焊接或(huo)離(li)心鑄造(zao)而成(cheng),具有高溫抗氧化性(xing)和抗滲(shen)碳性(xing)能好、使用(yong)壽命長(chang)等特點。