輻射加熱管概況
輻射加熱(re)管(guan),是把電加熱(re)元件封閉在保(bao)護套(tao)(tao)內通電發熱(re),由套(tao)(tao)管(guan)間(jian)接把熱(re)量輻射給爐(lu)襯和被處(chu)理(li)工件,紅外輻射加熱(re)管(guan)廣泛應用于熱(re)處(chu)理(li)行業的各(ge)種加熱(re)爐(lu)中。
輻(fu)(fu)射(she)加熱(re)(re)管(guan)(guan)使(shi)用的(de)電熱(re)(re)合金材料(liao)應具有較高(gao)(gao)(gao)的(de)電阻率,電熱(re)(re)轉化(hua)率高(gao)(gao)(gao)。由于輻(fu)(fu)射(she)管(guan)(guan)放置(zhi)在套管(guan)(guan)內(nei)(nei),傳熱(re)(re)過程與一般(ban)敞露型電熱(re)(re)元(yuan)件(jian)(jian)不同(tong),其熱(re)(re)屏(ping)蔽大(da),升(sheng)溫(wen)(wen)(wen)過程中必須對(dui)元(yuan)件(jian)(jian)溫(wen)(wen)(wen)度進行控(kong)制,防止元(yuan)件(jian)(jian)超溫(wen)(wen)(wen)。輻(fu)(fu)射(she)管(guan)(guan)封閉加熱(re)(re)時(shi)(shi),電熱(re)(re)元(yuan)件(jian)(jian)表面溫(wen)(wen)(wen)度比爐(lu)膛溫(wen)(wen)(wen)度高(gao)(gao)(gao)約100℃-150℃。所以(yi)在選材時(shi)(shi)要分(fen)析爐(lu)溫(wen)(wen)(wen)、爐(lu)內(nei)(nei)氣(qi)溫(wen)(wen)(wen)氛圍,選擇正確的(de)加熱(re)(re)材料(liao)。
目前輻(fu)射管(guan)(guan)加熱(re)管(guan)(guan)系列有鼠籠(long)式、立帶式和(he)螺旋式等,加熱(re)元(yuan)件系采用進口或(huo)國產電(dian)阻絲(si)、鎳鉻絲(si)(或(huo)帶)、鐵(tie)鉻鋁(lv)(絲(si)或(huo)帶),保(bao)護(hu)管(guan)(guan)采用進口高溫合金板材、耐熱(re)鋼板卷(juan)制(zhi)焊接(jie)或(huo)離(li)心鑄(zhu)造而(er)成,具有高溫抗(kang)氧化(hua)性和(he)抗(kang)滲碳性能好(hao)、使用壽命(ming)長等特點。