輻射加熱管概況
輻(fu)射(she)加(jia)熱(re)(re)管,是把(ba)電(dian)加(jia)熱(re)(re)元件(jian)封閉在保護套內通電(dian)發(fa)熱(re)(re),由(you)套管間(jian)接把(ba)熱(re)(re)量(liang)輻(fu)射(she)給(gei)爐(lu)襯和被(bei)處理工(gong)件(jian),紅(hong)外輻(fu)射(she)加(jia)熱(re)(re)管廣(guang)泛應用于熱(re)(re)處理行(xing)業的各種加(jia)熱(re)(re)爐(lu)中。
輻(fu)射(she)加(jia)熱(re)(re)管(guan)使用(yong)的電(dian)(dian)熱(re)(re)合金材(cai)料應具(ju)有(you)較(jiao)高的電(dian)(dian)阻率(lv)(lv),電(dian)(dian)熱(re)(re)轉化率(lv)(lv)高。由于輻(fu)射(she)管(guan)放置(zhi)在套管(guan)內(nei),傳熱(re)(re)過(guo)程與一般敞露型電(dian)(dian)熱(re)(re)元(yuan)件不同,其(qi)熱(re)(re)屏蔽大,升溫(wen)過(guo)程中必須對(dui)元(yuan)件溫(wen)度(du)(du)進(jin)行控(kong)制,防(fang)止元(yuan)件超溫(wen)。輻(fu)射(she)管(guan)封(feng)閉加(jia)熱(re)(re)時,電(dian)(dian)熱(re)(re)元(yuan)件表面溫(wen)度(du)(du)比(bi)爐(lu)膛溫(wen)度(du)(du)高約(yue)100℃-150℃。所以在選材(cai)時要分析爐(lu)溫(wen)、爐(lu)內(nei)氣溫(wen)氛(fen)圍,選擇正確(que)的加(jia)熱(re)(re)材(cai)料。
目前輻射(she)管加熱管系列有(you)鼠籠(long)式(shi)(shi)、立(li)帶(dai)式(shi)(shi)和螺(luo)旋(xuan)式(shi)(shi)等,加熱元件系采(cai)用進口(kou)或(huo)(huo)國(guo)產電阻絲、鎳(nie)鉻(ge)絲(或(huo)(huo)帶(dai))、鐵鉻(ge)鋁(絲或(huo)(huo)帶(dai)),保護管采(cai)用進口(kou)高溫合金(jin)板(ban)(ban)材(cai)、耐熱鋼(gang)板(ban)(ban)卷制焊接或(huo)(huo)離心鑄造(zao)而成,具有(you)高溫抗氧化性和抗滲碳性能(neng)好(hao)、使用壽命長等特點。