輻射加熱管概況
輻射加(jia)熱(re)管,是把電(dian)加(jia)熱(re)元件(jian)封閉在(zai)保護(hu)套內通(tong)電(dian)發熱(re),由套管間接(jie)把熱(re)量輻射給爐襯和被處理工件(jian),紅外輻射加(jia)熱(re)管廣泛(fan)應用于熱(re)處理行業的(de)各種(zhong)加(jia)熱(re)爐中。
輻射加熱(re)(re)管(guan)(guan)(guan)使用的(de)電(dian)(dian)熱(re)(re)合金材料應具有較高(gao)的(de)電(dian)(dian)阻率,電(dian)(dian)熱(re)(re)轉化率高(gao)。由于輻射管(guan)(guan)(guan)放置在(zai)套管(guan)(guan)(guan)內,傳熱(re)(re)過程與一般敞露型(xing)電(dian)(dian)熱(re)(re)元(yuan)件(jian)(jian)不同,其(qi)熱(re)(re)屏(ping)蔽大,升(sheng)溫(wen)(wen)(wen)過程中必須對元(yuan)件(jian)(jian)溫(wen)(wen)(wen)度(du)(du)進行控制(zhi),防止元(yuan)件(jian)(jian)超(chao)溫(wen)(wen)(wen)。輻射管(guan)(guan)(guan)封閉加熱(re)(re)時,電(dian)(dian)熱(re)(re)元(yuan)件(jian)(jian)表面(mian)溫(wen)(wen)(wen)度(du)(du)比爐(lu)膛溫(wen)(wen)(wen)度(du)(du)高(gao)約100℃-150℃。所以在(zai)選材時要分析爐(lu)溫(wen)(wen)(wen)、爐(lu)內氣溫(wen)(wen)(wen)氛圍,選擇正確的(de)加熱(re)(re)材料。
目前輻射(she)管(guan)加熱(re)管(guan)系列有鼠籠式、立帶式和(he)螺旋式等,加熱(re)元件(jian)系采用(yong)進口或(huo)(huo)國產電阻絲(si)、鎳鉻(ge)絲(si)(或(huo)(huo)帶)、鐵(tie)鉻(ge)鋁(絲(si)或(huo)(huo)帶),保護(hu)管(guan)采用(yong)進口高(gao)(gao)溫(wen)合金(jin)板材(cai)、耐熱(re)鋼板卷(juan)制焊(han)接(jie)或(huo)(huo)離心(xin)鑄(zhu)造而(er)成,具(ju)有高(gao)(gao)溫(wen)抗氧化性和(he)抗滲(shen)碳性能好(hao)、使(shi)用(yong)壽(shou)命(ming)長等特點。