輻射加熱管概況
輻射加熱管(guan),是把(ba)電加熱元件(jian)封閉在(zai)保護套內通電發熱,由套管(guan)間接把(ba)熱量(liang)輻射給爐(lu)襯(chen)和被處理工件(jian),紅外輻射加熱管(guan)廣泛(fan)應用于熱處理行(xing)業的各種(zhong)加熱爐(lu)中。
輻(fu)(fu)射加熱(re)(re)(re)(re)管(guan)使用的電(dian)(dian)(dian)(dian)熱(re)(re)(re)(re)合金(jin)材料應具有較高(gao)的電(dian)(dian)(dian)(dian)阻率(lv),電(dian)(dian)(dian)(dian)熱(re)(re)(re)(re)轉化率(lv)高(gao)。由于輻(fu)(fu)射管(guan)放置在套管(guan)內,傳熱(re)(re)(re)(re)過程與一般(ban)敞露(lu)型(xing)電(dian)(dian)(dian)(dian)熱(re)(re)(re)(re)元件(jian)不(bu)同,其熱(re)(re)(re)(re)屏蔽大,升溫(wen)(wen)過程中必須(xu)對元件(jian)溫(wen)(wen)度進行控(kong)制(zhi),防止元件(jian)超溫(wen)(wen)。輻(fu)(fu)射管(guan)封閉加熱(re)(re)(re)(re)時,電(dian)(dian)(dian)(dian)熱(re)(re)(re)(re)元件(jian)表面溫(wen)(wen)度比爐(lu)膛(tang)溫(wen)(wen)度高(gao)約100℃-150℃。所以在選材時要分析(xi)爐(lu)溫(wen)(wen)、爐(lu)內氣溫(wen)(wen)氛(fen)圍,選擇正確的加熱(re)(re)(re)(re)材料。
目前輻射管(guan)(guan)加熱管(guan)(guan)系列有鼠(shu)籠式、立帶式和螺旋(xuan)式等,加熱元件系采用進口或(huo)國產(chan)電阻絲(si)、鎳鉻(ge)絲(si)(或(huo)帶)、鐵鉻(ge)鋁(絲(si)或(huo)帶),保護(hu)管(guan)(guan)采用進口高(gao)溫合金板材、耐(nai)熱鋼板卷制焊接或(huo)離心鑄造而成,具有高(gao)溫抗(kang)氧化性和抗(kang)滲碳性能好、使用壽(shou)命長(chang)等特點(dian)。