輻射加熱管概況
輻(fu)(fu)(fu)射(she)加(jia)熱(re)(re)管(guan),是把電(dian)加(jia)熱(re)(re)元件封閉在保護套內通(tong)電(dian)發(fa)熱(re)(re),由套管(guan)間接把熱(re)(re)量輻(fu)(fu)(fu)射(she)給(gei)爐襯(chen)和被處理工件,紅外輻(fu)(fu)(fu)射(she)加(jia)熱(re)(re)管(guan)廣泛(fan)應用于熱(re)(re)處理行業的各(ge)種(zhong)加(jia)熱(re)(re)爐中。
輻射(she)加熱(re)管(guan)使用的電(dian)(dian)(dian)熱(re)合金(jin)材(cai)料(liao)應(ying)具有較高的電(dian)(dian)(dian)阻率,電(dian)(dian)(dian)熱(re)轉化率高。由于輻射(she)管(guan)放(fang)置在套(tao)管(guan)內,傳熱(re)過(guo)程(cheng)與一般敞露型電(dian)(dian)(dian)熱(re)元(yuan)(yuan)件(jian)不同,其熱(re)屏蔽大,升溫(wen)(wen)過(guo)程(cheng)中必須對元(yuan)(yuan)件(jian)溫(wen)(wen)度(du)進行控制,防止元(yuan)(yuan)件(jian)超溫(wen)(wen)。輻射(she)管(guan)封(feng)閉加熱(re)時(shi),電(dian)(dian)(dian)熱(re)元(yuan)(yuan)件(jian)表(biao)面溫(wen)(wen)度(du)比爐(lu)膛溫(wen)(wen)度(du)高約(yue)100℃-150℃。所以在選材(cai)時(shi)要分析爐(lu)溫(wen)(wen)、爐(lu)內氣(qi)溫(wen)(wen)氛圍,選擇正確的加熱(re)材(cai)料(liao)。
目前輻射管加(jia)熱(re)管系(xi)列有鼠籠式(shi)、立帶(dai)式(shi)和(he)螺旋(xuan)式(shi)等(deng),加(jia)熱(re)元件系(xi)采用(yong)進口或(huo)(huo)國產電(dian)阻絲、鎳(nie)鉻絲(或(huo)(huo)帶(dai))、鐵(tie)鉻鋁(絲或(huo)(huo)帶(dai)),保護管采用(yong)進口高(gao)溫(wen)合金板材、耐熱(re)鋼板卷制焊接(jie)或(huo)(huo)離(li)心(xin)鑄造而成,具有高(gao)溫(wen)抗氧化性和(he)抗滲(shen)碳(tan)性能好(hao)、使用(yong)壽命(ming)長(chang)等(deng)特點。