一、電熱管工作原理是什么
電熱管原理:利用(yong)電熱(re)管內(nei)部的(de)電阻絲來(lai)加(jia)熱(re)的(de)。
電熱(re)管是(shi)一種消耗電能(neng)轉換(huan)為熱(re)能(neng),來對需加(jia)熱(re)物料(liao)進(jin)行加(jia)熱(re)。在工作中低溫(wen)(wen)流(liu)體介質(zhi)通過管道在壓力(li)(li)作用下(xia)進(jin)入其輸入口(kou),沿著電加(jia)熱(re)容器(qi)內部(bu)特定換(huan)熱(re)流(liu)道,運用流(liu)體熱(re)力(li)(li)學原理設計(ji)的(de)路徑(jing),帶走電熱(re)元件工作中所產生的(de)高(gao)(gao)溫(wen)(wen)熱(re)能(neng)量,使(shi)被(bei)加(jia)熱(re)介質(zhi)溫(wen)(wen)度(du)升高(gao)(gao),電熱(re)管出口(kou)得到工藝(yi)要求(qiu)的(de)高(gao)(gao)溫(wen)(wen)介質(zhi)。
此外,電熱管還可以利用感應加熱或電弧加熱的方式工作。感應加熱通過產生交變電場或磁場來激化被加熱物體,使其產生高變運動或渦流,從而產生熱量。電弧加熱則通過在兩電極之間產生電弧,將電能直接轉化為熱能。電熱管的結構通常包括一個加熱線圈和一個由絕緣材料包裹的保護管,當電流通過加熱線圈時,線圈受熱膨脹,導致保護管內的加熱液體被加熱,從而產生熱傳導效應。電熱管是一種常見的加熱元件,應用范圍是非常廣泛的,那么就了解一下電熱管十大品牌吧。
二、電熱管好壞怎么判斷
電熱管質量好壞(huai)主要(yao)取決于電氣強度、絕緣、泄(xie)漏電流、功率準確性、壽命、耐(nai)腐(fu)蝕性、尺寸等。具體(ti)如下:
1、電氣強度:影響電(dian)(dian)熱管(guan)電(dian)(dian)氣強度的(de)(de)因素主(zhu)要包括絕緣(yuan)層(ceng)的(de)(de)厚度、絕緣(yuan)層(ceng)的(de)(de)原料質量、電(dian)(dian)熱管(guan)的(de)(de)長度、彎曲(qu)的(de)(de)半徑及彎曲(qu)的(de)(de)個數。
2、絕緣:影(ying)響(xiang)電(dian)熱(re)管(guan)絕(jue)緣的主要是電(dian)熱(re)管(guan)的封口工藝。
3、泄露電流:主要與電熱(re)管(guan)使用時的溫(wen)(wen)度(du)、電熱(re)管(guan)的使用電壓、電熱(re)管(guan)的發(fa)熱(re)長度(du)有(you)關。是對于高溫(wen)(wen)電熱(re)管(guan)的一(yi)個重要考核指標。
4、功率準確性:主要(yao)與電阻絲的(de)(de)質量(liang)(liang)、制造廠的(de)(de)工藝水平有關(guan)。電熱管在批量(liang)(liang)生產前都(dou)需要(yao)做溫(wen)度系數的(de)(de)試驗,以(yi)確定合(he)格的(de)(de)功(gong)率范圍(wei)的(de)(de)冷態電阻。
5、壽命:電(dian)熱管的壽命除了(le)與(yu)電(dian)阻絲質量(liang)(liang)有關(guan)外,還與(yu)氧化鎂粉的質量(liang)(liang)、電(dian)阻絲直徑的選擇等(deng)因素(su)有關(guan)。在(zai)選擇電(dian)阻絲的直徑時,需計(ji)算電(dian)阻絲的表面負荷以達到壽命要求(qiu)。
三、電熱管接線方法
電(dian)熱(re)管(guan)的接線方式(shi)在加熱(re)管(guan)上(shang)常用的有兩(liang)種方法(fa),一(yi)種是三角形接法(fa),另一(yi)種是星(xing)形接法(fa)。具體方法(fa)如下:
1、三角形接法
三角形接法:電加熱管(guan)每個元(yuan)件(jian)的(de)首端(duan)接(jie)另(ling)一個元(yuan)件(jian)的(de)尾端(duan),三(san)個接(jie)點分別接(jie)三(san)根相線的(de)接(jie)線方式;
三角形接法的特點:三個電加熱管元(yuan)件(jian)額(e)定電壓為380V;如三個元(yuan)件(jian)電阻值不同(tong),也不影(ying)響這種(zhong)接(jie)(jie)法(fa)(fa)的(de)可行性。三角(jiao)形接(jie)(jie)法(fa)(fa)比星形接(jie)(jie)法(fa)(fa)功率和(he)電流都三倍。
2、星形接法
星形接法:三(san)(san)(san)個電(dian)熱(re)管(guan)的加熱(re)元件,每個元件的首端連在(zai)一起(這個點稱中性點),三(san)(san)(san)個尾(wei)端分別接三(san)(san)(san)根(gen)相線(xian)的接線(xian)方式。三(san)(san)(san)個元件額定電(dian)壓(ya)為220V時;如(ru)果三(san)(san)(san)個元件電(dian)阻值不同,則中性點應該接零線(xian)。
四、電熱管怎樣分220v和380v
電(dian)熱(re)管(guan)的電(dian)壓分220V和380V主要是通過其(qi)電(dian)阻值和接線方式(shi)來判斷(duan)。以下是兩(liang)種電(dian)壓類型的介紹:
1、電阻值:電(dian)(dian)熱管的(de)電(dian)(dian)阻值決(jue)定了(le)其使用的(de)電(dian)(dian)壓等(deng)級,通常情況下,電(dian)(dian)阻值是(shi)220V的(de)平方或(huo)380V的(de)平方,這可以通過測量電(dian)(dian)阻值來確定。
2、接線方式:電(dian)(dian)(dian)(dian)(dian)(dian)(dian)熱(re)(re)(re)管(guan)(guan)的(de)接(jie)(jie)線(xian)方式(shi)也(ye)是判(pan)斷其(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)類型的(de)重要依據,一(yi)(yi)根(gen)(gen)額(e)定電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)為(wei)220V的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)熱(re)(re)(re)管(guan)(guan),當(dang)單獨使用(yong)(yong)時(shi),其(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)應為(wei)220V;若(ruo)(ruo)三根(gen)(gen)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)熱(re)(re)(re)管(guan)(guan)一(yi)(yi)起使用(yong)(yong),可以采用(yong)(yong)并(bing)聯接(jie)(jie)線(xian)接(jie)(jie)220V電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya),或者采用(yong)(yong)星型(Y型)接(jie)(jie)線(xian)法接(jie)(jie)380V電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)。同樣,一(yi)(yi)根(gen)(gen)額(e)定電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)為(wei)380V的(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)熱(re)(re)(re)管(guan)(guan),當(dang)單獨使用(yong)(yong)時(shi),其(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)應為(wei)380V;若(ruo)(ruo)三根(gen)(gen)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)熱(re)(re)(re)管(guan)(guan)一(yi)(yi)起使用(yong)(yong),可以采用(yong)(yong)并(bing)聯接(jie)(jie)線(xian)接(jie)(jie)380V電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya),或者采用(yong)(yong)三角型(△型)接(jie)(jie)線(xian)法接(jie)(jie)380V電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)。
此(ci)外,電(dian)(dian)(dian)熱管(guan)的電(dian)(dian)(dian)阻(zu)(zu)絲的粗(cu)細(xi)也(ye)會(hui)影響其(qi)使用的電(dian)(dian)(dian)壓(ya)等級,電(dian)(dian)(dian)壓(ya)越小,電(dian)(dian)(dian)阻(zu)(zu)絲越粗(cu)。在(zai)實(shi)(shi)際應用中(zhong),電(dian)(dian)(dian)熱管(guan)的電(dian)(dian)(dian)壓(ya)類型通(tong)常會(hui)在(zai)其(qi)外殼上(shang)標明,如果無法辨認,可以通(tong)過測量電(dian)(dian)(dian)流和計算(suan)功率(lv)的方式(shi)來初步判(pan)(pan)斷(duan)(duan),或者(zhe)通(tong)過實(shi)(shi)際加熱效(xiao)果來判(pan)(pan)斷(duan)(duan)。