輻射加熱管概況
輻(fu)(fu)射(she)加(jia)熱(re)(re)管(guan)(guan),是(shi)把電加(jia)熱(re)(re)元(yuan)件封(feng)閉在(zai)保護套(tao)內通電發(fa)熱(re)(re),由套(tao)管(guan)(guan)間接把熱(re)(re)量輻(fu)(fu)射(she)給(gei)爐(lu)襯和(he)被處(chu)理工件,紅外輻(fu)(fu)射(she)加(jia)熱(re)(re)管(guan)(guan)廣(guang)泛應用于熱(re)(re)處(chu)理行業的各種加(jia)熱(re)(re)爐(lu)中。
輻(fu)射(she)加熱(re)(re)(re)管使(shi)用的電(dian)(dian)熱(re)(re)(re)合金材料應具有較高的電(dian)(dian)阻率,電(dian)(dian)熱(re)(re)(re)轉(zhuan)化率高。由于輻(fu)射(she)管放置在套管內(nei),傳熱(re)(re)(re)過(guo)程(cheng)與一般(ban)敞(chang)露(lu)型電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)不同(tong),其熱(re)(re)(re)屏蔽大,升溫(wen)過(guo)程(cheng)中必須(xu)對(dui)元(yuan)件(jian)溫(wen)度進行控制,防止元(yuan)件(jian)超溫(wen)。輻(fu)射(she)管封閉加熱(re)(re)(re)時(shi),電(dian)(dian)熱(re)(re)(re)元(yuan)件(jian)表面溫(wen)度比爐(lu)膛溫(wen)度高約100℃-150℃。所以在選(xuan)(xuan)材時(shi)要分析爐(lu)溫(wen)、爐(lu)內(nei)氣溫(wen)氛圍,選(xuan)(xuan)擇正確(que)的加熱(re)(re)(re)材料。
目(mu)前輻射管(guan)加熱管(guan)系列(lie)有鼠籠(long)式(shi)、立帶式(shi)和螺旋式(shi)等,加熱元(yuan)件系采用(yong)(yong)進(jin)口(kou)(kou)或(huo)(huo)國產電阻絲、鎳鉻絲(或(huo)(huo)帶)、鐵鉻鋁(絲或(huo)(huo)帶),保護(hu)管(guan)采用(yong)(yong)進(jin)口(kou)(kou)高溫(wen)合金板材、耐熱鋼板卷(juan)制焊接或(huo)(huo)離心鑄造(zao)而成(cheng),具有高溫(wen)抗氧化性和抗滲碳(tan)性能好(hao)、使用(yong)(yong)壽(shou)命長等特點。