輻射加熱管概況
輻射加(jia)熱管(guan),是把電(dian)加(jia)熱元(yuan)件封閉在保(bao)護套內通電(dian)發熱,由(you)套管(guan)間(jian)接把熱量輻射給爐(lu)襯和被處理(li)工件,紅外輻射加(jia)熱管(guan)廣泛應用于(yu)熱處理(li)行業的各種加(jia)熱爐(lu)中。
輻(fu)(fu)射加(jia)熱(re)(re)管(guan)(guan)使用的電(dian)(dian)(dian)熱(re)(re)合(he)金(jin)材(cai)(cai)(cai)料(liao)應具有較高的電(dian)(dian)(dian)阻率,電(dian)(dian)(dian)熱(re)(re)轉化率高。由于(yu)輻(fu)(fu)射管(guan)(guan)放置在套管(guan)(guan)內,傳熱(re)(re)過程與一般敞露型電(dian)(dian)(dian)熱(re)(re)元件(jian)不(bu)同(tong),其熱(re)(re)屏(ping)蔽大,升溫(wen)(wen)過程中必須(xu)對元件(jian)溫(wen)(wen)度(du)進(jin)行(xing)控(kong)制(zhi),防止元件(jian)超溫(wen)(wen)。輻(fu)(fu)射管(guan)(guan)封閉加(jia)熱(re)(re)時,電(dian)(dian)(dian)熱(re)(re)元件(jian)表面(mian)溫(wen)(wen)度(du)比(bi)爐(lu)膛溫(wen)(wen)度(du)高約100℃-150℃。所以在選材(cai)(cai)(cai)時要(yao)分析(xi)爐(lu)溫(wen)(wen)、爐(lu)內氣(qi)溫(wen)(wen)氛圍,選擇(ze)正確的加(jia)熱(re)(re)材(cai)(cai)(cai)料(liao)。
目(mu)前輻射管加熱管系列有鼠籠式、立帶(dai)式和螺旋式等,加熱元(yuan)件系采(cai)用進(jin)口或(huo)(huo)國產電阻(zu)絲、鎳鉻絲(或(huo)(huo)帶(dai))、鐵(tie)鉻鋁(絲或(huo)(huo)帶(dai)),保護管采(cai)用進(jin)口高溫合(he)金板材、耐熱鋼(gang)板卷(juan)制(zhi)焊接或(huo)(huo)離心鑄造而成,具有高溫抗氧化(hua)性(xing)和抗滲碳性(xing)能好、使(shi)用壽命長(chang)等特點。