輻射加熱管概況
輻射(she)(she)加(jia)熱(re)管(guan),是(shi)把(ba)電(dian)加(jia)熱(re)元件封閉在保護套內通(tong)電(dian)發(fa)熱(re),由(you)套管(guan)間(jian)接把(ba)熱(re)量輻射(she)(she)給爐襯和(he)被處(chu)理(li)工件,紅外輻射(she)(she)加(jia)熱(re)管(guan)廣泛應用(yong)于(yu)熱(re)處(chu)理(li)行業的各種(zhong)加(jia)熱(re)爐中。
輻(fu)射加(jia)熱(re)管(guan)使用的電(dian)(dian)(dian)熱(re)合(he)金材(cai)(cai)料應具有較高的電(dian)(dian)(dian)阻率(lv),電(dian)(dian)(dian)熱(re)轉化率(lv)高。由于輻(fu)射管(guan)放置在(zai)套管(guan)內(nei),傳熱(re)過程與(yu)一般敞露型(xing)電(dian)(dian)(dian)熱(re)元(yuan)(yuan)件(jian)(jian)不同,其熱(re)屏蔽大,升溫(wen)(wen)(wen)過程中(zhong)必(bi)須(xu)對元(yuan)(yuan)件(jian)(jian)溫(wen)(wen)(wen)度進行(xing)控制,防止元(yuan)(yuan)件(jian)(jian)超溫(wen)(wen)(wen)。輻(fu)射管(guan)封(feng)閉加(jia)熱(re)時,電(dian)(dian)(dian)熱(re)元(yuan)(yuan)件(jian)(jian)表面溫(wen)(wen)(wen)度比爐(lu)膛溫(wen)(wen)(wen)度高約100℃-150℃。所以在(zai)選材(cai)(cai)時要分析(xi)爐(lu)溫(wen)(wen)(wen)、爐(lu)內(nei)氣(qi)溫(wen)(wen)(wen)氛圍,選擇正確的加(jia)熱(re)材(cai)(cai)料。
目前輻(fu)射管(guan)加熱管(guan)系列有(you)鼠(shu)籠式、立帶式和螺旋(xuan)式等,加熱元件(jian)系采用(yong)進口或國產電阻絲、鎳鉻絲(或帶)、鐵鉻鋁(lv)(絲或帶),保護管(guan)采用(yong)進口高(gao)(gao)溫合金板(ban)材、耐熱鋼(gang)板(ban)卷(juan)制焊接或離(li)心鑄造而成,具有(you)高(gao)(gao)溫抗氧化性和抗滲碳(tan)性能(neng)好、使用(yong)壽(shou)命長等特(te)點。