輻射加熱管概況
輻(fu)射加(jia)(jia)熱管(guan)(guan),是把(ba)電(dian)加(jia)(jia)熱元(yuan)件(jian)封閉(bi)在保(bao)護套(tao)內通電(dian)發熱,由套(tao)管(guan)(guan)間接把(ba)熱量輻(fu)射給爐襯(chen)和被(bei)處理(li)工(gong)件(jian),紅外輻(fu)射加(jia)(jia)熱管(guan)(guan)廣泛應(ying)用于熱處理(li)行業的各種加(jia)(jia)熱爐中。
輻(fu)(fu)射(she)加(jia)熱(re)(re)管(guan)(guan)(guan)(guan)使用的電(dian)(dian)熱(re)(re)合金材料應(ying)具有較(jiao)高(gao)(gao)的電(dian)(dian)阻率,電(dian)(dian)熱(re)(re)轉化率高(gao)(gao)。由于(yu)輻(fu)(fu)射(she)管(guan)(guan)(guan)(guan)放置(zhi)在(zai)套管(guan)(guan)(guan)(guan)內,傳熱(re)(re)過程與一般(ban)敞露型電(dian)(dian)熱(re)(re)元件不同,其熱(re)(re)屏蔽(bi)大(da),升溫(wen)(wen)過程中必須對元件溫(wen)(wen)度(du)進行控制,防止元件超溫(wen)(wen)。輻(fu)(fu)射(she)管(guan)(guan)(guan)(guan)封閉加(jia)熱(re)(re)時,電(dian)(dian)熱(re)(re)元件表面溫(wen)(wen)度(du)比爐膛溫(wen)(wen)度(du)高(gao)(gao)約100℃-150℃。所以在(zai)選(xuan)材時要(yao)分析爐溫(wen)(wen)、爐內氣溫(wen)(wen)氛圍(wei),選(xuan)擇正確的加(jia)熱(re)(re)材料。
目前(qian)輻(fu)射管(guan)(guan)加熱管(guan)(guan)系(xi)列(lie)有鼠籠(long)式(shi)、立帶式(shi)和(he)螺旋式(shi)等,加熱元件系(xi)采(cai)用進口或(huo)(huo)國產電阻絲、鎳鉻絲(或(huo)(huo)帶)、鐵鉻鋁(lv)(絲或(huo)(huo)帶),保護(hu)管(guan)(guan)采(cai)用進口高(gao)溫(wen)合金板材、耐熱鋼板卷(juan)制焊接或(huo)(huo)離心鑄(zhu)造(zao)而成(cheng),具有高(gao)溫(wen)抗氧化性和(he)抗滲碳性能好、使用壽(shou)命(ming)長等特點(dian)。