輻射加熱管概況
輻(fu)射(she)加(jia)熱(re)(re)(re)管(guan),是把電加(jia)熱(re)(re)(re)元件(jian)封閉(bi)在保護套(tao)(tao)內通電發熱(re)(re)(re),由套(tao)(tao)管(guan)間(jian)接把熱(re)(re)(re)量輻(fu)射(she)給爐(lu)襯和(he)被(bei)處(chu)理工(gong)件(jian),紅外輻(fu)射(she)加(jia)熱(re)(re)(re)管(guan)廣泛應用于熱(re)(re)(re)處(chu)理行業(ye)的各種加(jia)熱(re)(re)(re)爐(lu)中。
輻(fu)(fu)射加(jia)熱(re)(re)管使用的(de)電(dian)(dian)熱(re)(re)合(he)金材(cai)料應具有較高(gao)的(de)電(dian)(dian)阻率(lv),電(dian)(dian)熱(re)(re)轉化率(lv)高(gao)。由于輻(fu)(fu)射管放置在(zai)套管內(nei),傳熱(re)(re)過(guo)(guo)程與(yu)一般敞露型(xing)電(dian)(dian)熱(re)(re)元(yuan)件(jian)(jian)不同(tong),其(qi)熱(re)(re)屏蔽(bi)大(da),升溫(wen)(wen)(wen)過(guo)(guo)程中(zhong)必須(xu)對(dui)元(yuan)件(jian)(jian)溫(wen)(wen)(wen)度(du)進行控(kong)制,防止(zhi)元(yuan)件(jian)(jian)超溫(wen)(wen)(wen)。輻(fu)(fu)射管封(feng)閉加(jia)熱(re)(re)時(shi),電(dian)(dian)熱(re)(re)元(yuan)件(jian)(jian)表(biao)面溫(wen)(wen)(wen)度(du)比爐膛溫(wen)(wen)(wen)度(du)高(gao)約100℃-150℃。所以(yi)在(zai)選材(cai)時(shi)要分析爐溫(wen)(wen)(wen)、爐內(nei)氣溫(wen)(wen)(wen)氛圍(wei),選擇正確(que)的(de)加(jia)熱(re)(re)材(cai)料。
目(mu)前輻射(she)管(guan)加熱(re)管(guan)系列有鼠籠式(shi)、立帶式(shi)和(he)螺旋式(shi)等,加熱(re)元件系采用進口或國(guo)產電阻絲、鎳鉻絲(或帶)、鐵鉻鋁(絲或帶),保(bao)護管(guan)采用進口高溫(wen)合金板(ban)材、耐熱(re)鋼板(ban)卷制焊接(jie)或離(li)心鑄造(zao)而成,具(ju)有高溫(wen)抗氧化性和(he)抗滲碳(tan)性能好(hao)、使(shi)用壽命(ming)長等特點。