電加熱管性能要求

4

絕緣電阻

出廠(chang)檢驗時冷態絕(jue)緣電(dian)阻應不(bu)小(xiao)于50MΩ

密封試驗(yan)后(hou)，長期存(cun)放(fang)或者使用后(hou)的絕緣電(dian)阻(zu)應不消與MΩ

工作(zuo)溫度下的(de)熱態絕緣電阻應(ying)不(bu)低(di)于公式中的(de)計算(suan)值，但小應(ying)不(bu)小于1MΩ

R=「（10-0.015T）/t」×0.001

R—熱態絕緣電阻MΩ

t—發熱長度mm

T—工作溫度℃

5

絕緣耐壓強度

元件應在(zai)規定的試驗(yan)條件和試驗(yan)電壓下保持1min，而無(wu)閃絡和擊穿(chuan)現象

6

經受通斷電的能力

元(yuan)件應能在規定的(de)試驗條件下經歷2000次通斷電試驗，而(er)不發生損壞

電(dian)(dian)(dian)(dian)弧(hu)(hu)加熱　　利用電(dian)(dian)(dian)(dian)弧(hu)(hu)產生的(de)(de)(de)高(gao)溫(wen)加熱物體(ti)。電(dian)(dian)(dian)(dian)弧(hu)(hu)是(shi)兩電(dian)(dian)(dian)(dian)極間的(de)(de)(de)氣體(ti)放電(dian)(dian)(dian)(dian)現象。電(dian)(dian)(dian)(dian)弧(hu)(hu)的(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)不高(gao)但電(dian)(dian)(dian)(dian)流很大(da)(da)，其強(qiang)大(da)(da)的(de)(de)(de)電(dian)(dian)(dian)(dian)流靠電(dian)(dian)(dian)(dian)極上(shang)蒸(zheng)發的(de)(de)(de)大(da)(da)量離子所維持，因而電(dian)(dian)(dian)(dian)弧(hu)(hu)易受(shou)周圍磁場的(de)(de)(de)影響(xiang)。當電(dian)(dian)(dian)(dian)極間形成電(dian)(dian)(dian)(dian)弧(hu)(hu)時，電(dian)(dian)(dian)(dian)加熱管，電(dian)(dian)(dian)(dian)弧(hu)(hu)柱的(de)(de)(de)溫(wen)度可(ke)達3000～6000K，適于金屬(shu)的(de)(de)(de)高(gao)溫(wen)熔煉。

電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)加(jia)(jia)(jia)熱(re)(re)有(you)直接(jie)(jie)(jie)(jie)和(he)間接(jie)(jie)(jie)(jie)電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)加(jia)(jia)(jia)熱(re)(re)兩種。直接(jie)(jie)(jie)(jie)電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)加(jia)(jia)(jia)熱(re)(re)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)電(dian)(dian)(dian)(dian)(dian)(dian)流直接(jie)(jie)(jie)(jie)通過(guo)被加(jia)(jia)(jia)熱(re)(re)物體，被加(jia)(jia)(jia)熱(re)(re)物體必須是電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)的(de)(de)一(yi)個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)或是媒(mei)質。間接(jie)(jie)(jie)(jie)電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)加(jia)(jia)(jia)熱(re)(re)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)電(dian)(dian)(dian)(dian)(dian)(dian)流不通過(guo)被加(jia)(jia)(jia)熱(re)(re)物體，主(zhu)要靠電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)輻射的(de)(de)熱(re)(re)量加(jia)(jia)(jia)熱(re)(re)。電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)加(jia)(jia)(jia)熱(re)(re)的(de)(de)特點是：電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)溫度高(gao)，能量集中，煉鋼電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)爐溶(rong)池的(de)(de)表面功(gong)率可達560～1200千瓦/平方(fang)米。但(dan)電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)的(de)(de)噪聲大，其伏(fu)安特性為負阻(zu)特性（下(xia)降特性）。為了(le)在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)加(jia)(jia)(jia)熱(re)(re)時(shi)保持(chi)電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)的(de)(de)穩定(ding)、在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)弧(hu)電(dian)(dian)(dian)(dian)(dian)(dian)流瞬(shun)時(shi)過(guo)零時(shi)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)電(dian)(dian)(dian)(dian)(dian)(dian)壓的(de)(de)瞬(shun)時(shi)值(zhi)大于起弧(hu)電(dian)(dian)(dian)(dian)(dian)(dian)壓值(zhi)，不銹鋼u型電(dian)(dian)(dian)(dian)(dian)(dian)加(jia)(jia)(jia)熱(re)(re)管，同(tong)時(shi)為了(le)限制短路(lu)電(dian)(dian)(dian)(dian)(dian)(dian)流，在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)回路(lu)中，必須串(chuan)接(jie)(jie)(jie)(jie)一(yi)定(ding)數值(zhi)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)器(qi)。

導(dao)(dao)熱(re)(re)(re)油(you)(you)又稱有機(ji)熱(re)(re)(re)載(zai)體(ti)或熱(re)(re)(re)介質(zhi)油(you)(you)，大功率(lv)電(dian)(dian)(dian)加(jia)熱(re)(re)(re)管，作(zuo)為中(zhong)間(jian)傳(chuan)熱(re)(re)(re)介質(zhi)在工(gong)業(ye)換(huan)熱(re)(re)(re)過程中(zhong)的應用(yong)已有五十年(nian)以(yi)上的歷史。導(dao)(dao)熱(re)(re)(re)油(you)(you)電(dian)(dian)(dian)加(jia)熱(re)(re)(re)器系統由防爆電(dian)(dian)(dian)加(jia)熱(re)(re)(re)器、有機(ji)熱(re)(re)(re)載(zai)體(ti)爐、換(huan)熱(re)(re)(re)器（如有）、現場防爆操(cao)作(zuo)箱(xiang)、熱(re)(re)(re)油(you)(you)泵、膨脹槽(cao)等組合成一(yi)個(ge)撬塊，用(yong)戶(hu)只僅(jin)需接(jie)入電(dian)(dian)(dian)源、介質(zhi)的進出口管道及一(yi)些電(dian)(dian)(dian)氣接(jie)口即可使用(yong)導(dao)(dao)熱(re)(re)(re)油(you)(you)電(dian)(dian)(dian)加(jia)熱(re)(re)(re)器.

導熱(re)(re)(re)油(you)又(you)稱有(you)機熱(re)(re)(re)載體或熱(re)(re)(re)介質(zhi)油(you)，作(zuo)為中(zhong)間傳(chuan)熱(re)(re)(re)介質(zhi)在工(gong)業換(huan)熱(re)(re)(re)過程中(zhong)的(de)應(ying)用(yong)已(yi)有(you)五十年以上的(de)歷史。導熱(re)(re)(re)油(you)電(dian)加熱(re)(re)(re)器(qi)(qi)系統由防爆電(dian)加熱(re)(re)(re)器(qi)(qi)、有(you)機熱(re)(re)(re)載體爐、換(huan)熱(re)(re)(re)器(qi)(qi)（如有(you)）、現場防爆操作(zuo)箱、熱(re)(re)(re)油(you)泵、膨(peng)脹槽(cao)等組合(he)成一個撬塊，用(yong)戶只僅(jin)需接入電(dian)源、介質(zhi)的(de)進出口(kou)管道及一些(xie)電(dian)氣接口(kou)即可使用(yong)導熱(re)(re)(re)油(you)電(dian)加熱(re)(re)(re)器(qi)(qi).