輻射加熱管概況
輻射(she)加熱(re)(re)管,是把電加熱(re)(re)元件封閉在保護套(tao)內通電發(fa)熱(re)(re),由套(tao)管間(jian)接把熱(re)(re)量(liang)輻射(she)給爐(lu)襯和被處(chu)理工件,紅外輻射(she)加熱(re)(re)管廣泛(fan)應用于熱(re)(re)處(chu)理行業的各(ge)種(zhong)加熱(re)(re)爐(lu)中。
輻(fu)射(she)加(jia)熱(re)(re)(re)管使用的電(dian)熱(re)(re)(re)合金材料應具有較高的電(dian)阻率,電(dian)熱(re)(re)(re)轉化率高。由于輻(fu)射(she)管放置在(zai)(zai)套管內,傳熱(re)(re)(re)過程與一般敞露型電(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)不同,其熱(re)(re)(re)屏蔽(bi)大,升溫(wen)(wen)(wen)(wen)過程中(zhong)必須對元(yuan)件(jian)(jian)溫(wen)(wen)(wen)(wen)度(du)(du)進行控制,防止元(yuan)件(jian)(jian)超溫(wen)(wen)(wen)(wen)。輻(fu)射(she)管封閉加(jia)熱(re)(re)(re)時,電(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)表面溫(wen)(wen)(wen)(wen)度(du)(du)比爐(lu)(lu)膛溫(wen)(wen)(wen)(wen)度(du)(du)高約(yue)100℃-150℃。所以在(zai)(zai)選材時要分(fen)析爐(lu)(lu)溫(wen)(wen)(wen)(wen)、爐(lu)(lu)內氣溫(wen)(wen)(wen)(wen)氛圍,選擇(ze)正確的加(jia)熱(re)(re)(re)材料。
目前輻射(she)管(guan)加熱(re)管(guan)系列(lie)有鼠籠式(shi)、立帶式(shi)和螺旋(xuan)式(shi)等(deng),加熱(re)元件系采用(yong)進(jin)口或國產電阻絲(si)(si)、鎳鉻(ge)絲(si)(si)(或帶)、鐵鉻(ge)鋁(絲(si)(si)或帶),保護管(guan)采用(yong)進(jin)口高(gao)溫合(he)金板材、耐(nai)熱(re)鋼板卷(juan)制(zhi)焊接或離心鑄造而成,具(ju)有高(gao)溫抗氧化(hua)性和抗滲(shen)碳性能(neng)好、使用(yong)壽(shou)命長(chang)等(deng)特點。