輻射加熱管概況
輻射(she)加(jia)(jia)熱管(guan)(guan),是把電(dian)加(jia)(jia)熱元(yuan)件(jian)封閉在保(bao)護套內(nei)通電(dian)發熱,由套管(guan)(guan)間接(jie)把熱量輻射(she)給爐(lu)襯和(he)被處理工件(jian),紅外輻射(she)加(jia)(jia)熱管(guan)(guan)廣泛應用于(yu)熱處理行業的各(ge)種加(jia)(jia)熱爐(lu)中(zhong)。
輻射(she)加熱(re)(re)管(guan)使(shi)用的電(dian)熱(re)(re)合金材料應(ying)具有(you)較高(gao)的電(dian)阻(zu)率,電(dian)熱(re)(re)轉(zhuan)化(hua)率高(gao)。由(you)于輻射(she)管(guan)放置在(zai)套管(guan)內,傳熱(re)(re)過程(cheng)與一般敞(chang)露型電(dian)熱(re)(re)元(yuan)件(jian)(jian)不(bu)同,其熱(re)(re)屏蔽大(da),升溫(wen)(wen)過程(cheng)中必須對元(yuan)件(jian)(jian)溫(wen)(wen)度(du)進行控(kong)制,防(fang)止元(yuan)件(jian)(jian)超溫(wen)(wen)。輻射(she)管(guan)封閉(bi)加熱(re)(re)時(shi),電(dian)熱(re)(re)元(yuan)件(jian)(jian)表(biao)面溫(wen)(wen)度(du)比爐(lu)(lu)膛溫(wen)(wen)度(du)高(gao)約100℃-150℃。所以在(zai)選材時(shi)要分析(xi)爐(lu)(lu)溫(wen)(wen)、爐(lu)(lu)內氣溫(wen)(wen)氛圍,選擇正(zheng)確的加熱(re)(re)材料。
目前輻射管(guan)加熱管(guan)系(xi)列有鼠籠(long)式、立帶式和螺旋(xuan)式等(deng),加熱元件系(xi)采用進口(kou)或(huo)(huo)國產(chan)電阻(zu)絲(si)、鎳鉻(ge)絲(si)(或(huo)(huo)帶)、鐵(tie)鉻(ge)鋁(lv)(絲(si)或(huo)(huo)帶),保護(hu)管(guan)采用進口(kou)高溫(wen)合金板材、耐(nai)熱鋼(gang)板卷制焊接(jie)或(huo)(huo)離心鑄(zhu)造(zao)而成,具(ju)有高溫(wen)抗氧化性(xing)和抗滲(shen)碳性(xing)能好、使(shi)用壽命長等(deng)特點。