輻射加熱管概況
輻(fu)射加(jia)熱(re)管(guan)(guan),是(shi)把(ba)電加(jia)熱(re)元件(jian)封(feng)閉在(zai)保護套(tao)內通(tong)電發熱(re),由(you)套(tao)管(guan)(guan)間接(jie)把(ba)熱(re)量輻(fu)射給爐襯(chen)和被(bei)處理工(gong)件(jian),紅外輻(fu)射加(jia)熱(re)管(guan)(guan)廣泛應用于熱(re)處理行業的(de)各種加(jia)熱(re)爐中。
輻射(she)加(jia)(jia)熱(re)管(guan)(guan)使用的(de)電熱(re)合(he)金材(cai)料應具(ju)有較高(gao)(gao)的(de)電阻(zu)率,電熱(re)轉化率高(gao)(gao)。由于輻射(she)管(guan)(guan)放(fang)置在套管(guan)(guan)內,傳熱(re)過程與一般(ban)敞露型電熱(re)元(yuan)(yuan)件不同,其熱(re)屏蔽(bi)大,升(sheng)溫(wen)(wen)(wen)(wen)過程中必須對元(yuan)(yuan)件溫(wen)(wen)(wen)(wen)度(du)進行控制,防止元(yuan)(yuan)件超溫(wen)(wen)(wen)(wen)。輻射(she)管(guan)(guan)封閉加(jia)(jia)熱(re)時(shi)(shi),電熱(re)元(yuan)(yuan)件表面溫(wen)(wen)(wen)(wen)度(du)比(bi)爐(lu)膛溫(wen)(wen)(wen)(wen)度(du)高(gao)(gao)約100℃-150℃。所以在選材(cai)時(shi)(shi)要分析爐(lu)溫(wen)(wen)(wen)(wen)、爐(lu)內氣溫(wen)(wen)(wen)(wen)氛圍,選擇正確的(de)加(jia)(jia)熱(re)材(cai)料。
目(mu)前(qian)輻射管加熱(re)管系列有(you)鼠(shu)籠式(shi)、立帶(dai)式(shi)和螺旋式(shi)等,加熱(re)元件(jian)系采(cai)用(yong)(yong)進(jin)(jin)口或(huo)國產電阻絲(si)、鎳鉻絲(si)(或(huo)帶(dai))、鐵鉻鋁(絲(si)或(huo)帶(dai)),保護管采(cai)用(yong)(yong)進(jin)(jin)口高(gao)(gao)溫合金(jin)板材、耐熱(re)鋼板卷制(zhi)焊接或(huo)離心鑄(zhu)造而成(cheng),具有(you)高(gao)(gao)溫抗(kang)(kang)氧(yang)化(hua)性(xing)和抗(kang)(kang)滲碳性(xing)能好、使用(yong)(yong)壽命長等特點。