空氣加熱器工作原理
把一(yi)(yi)個(ge)匝數較多的初級(ji)線圈和一(yi)(yi)個(ge)匝數較少的次級(ji)線圈裝在(zai)同一(yi)(yi)個(ge)鐵芯上。輸入與輸出(chu)的電(dian)(dian)(dian)壓比等于線圈匝數之比,同時(shi)能量(liang)(liang)保(bao)(bao)持不變(bian)。因(yin)此,次級(ji)線圈在(zai)低(di)電(dian)(dian)(dian)壓的條件下產生(sheng)大電(dian)(dian)(dian)流(liu)。對于感(gan)應(ying)(ying)加熱(re)器(qi)來說(shuo),軸(zhou)承是一(yi)(yi)個(ge)短路單匝的次級(ji)線圈,在(zai)較低(di)交流(liu)電(dian)(dian)(dian)壓的條件下通過(guo)大電(dian)(dian)(dian)流(liu),因(yin)而產生(sheng)很大的熱(re)量(liang)(liang)。加熱(re)器(qi)本身及磁(ci)軛(e)則保(bao)(bao)持常溫。由于這種加熱(re)方法能感(gan)應(ying)(ying)出(chu)電(dian)(dian)(dian)流(liu),因(yin)此軸(zhou)承會(hui)被(bei)磁(ci)化(hua)。重要(yao)的是要(yao)確保(bao)(bao)以后給軸(zhou)承消磁(ci),使之在(zai)操作過(guo)程中不會(hui)吸住(zhu)金屬(shu)磁(ci)屑,FAG感(gan)應(ying)(ying)加熱(re)器(qi)都有自動(dong)消磁(ci)功能。
是利用金(jin)屬(shu)在(zai)交(jiao)變(bian)磁場中(zhong)產生(sheng)渦流(liu)而(er)使(shi)本身發熱(re)(re)(re),通常用在(zai)金(jin)屬(shu)熱(re)(re)(re)處(chu)理等(deng)方面。原理是較厚的金(jin)屬(shu)處(chu)于交(jiao)變(bian)磁場中(zhong)時,會由于電(dian)(dian)(dian)(dian)磁感(gan)應現象而(er)產生(sheng)電(dian)(dian)(dian)(dian)流(liu)。而(er)較厚的金(jin)屬(shu)其產生(sheng)電(dian)(dian)(dian)(dian)流(liu)后,電(dian)(dian)(dian)(dian)流(liu)會在(zai)金(jin)屬(shu)內(nei)部形成螺旋形的流(liu)動(dong)路線,這樣由于電(dian)(dian)(dian)(dian)流(liu)流(liu)動(dong)而(er)產生(sheng)的熱(re)(re)(re)量就都被(bei)金(jin)屬(shu)本身吸(xi)收了,會導(dao)致金(jin)屬(shu)很(hen)快升溫。
在耐高(gao)溫不銹(xiu)鋼無(wu)縫(feng)管內(nei)均勻地(di)分布高(gao)溫電(dian)(dian)阻絲,在空(kong)隙部(bu)分致密(mi)地(di)填(tian)入(ru)導熱(re)(re)性(xing)能和絕緣性(xing)能均良好的結晶氧化(hua)鎂(mei)粉(fen),這種結構不但(dan)先進,熱(re)(re)效率高(gao),而(er)且發熱(re)(re)均勻,當(dang)高(gao)溫電(dian)(dian)阻絲中有(you)電(dian)(dian)流通(tong)過時,產生(sheng)的熱(re)(re)通(tong)過結晶氧化(hua)鎂(mei)粉(fen)向金屬管表面擴散,再(zai)傳遞到(dao)被加(jia)(jia)熱(re)(re)件或空(kong)氣中去(qu),達到(dao)加(jia)(jia)熱(re)(re)的目的。
空氣電加熱器主要是用來將所需要的空氣流從初始溫度加熱到所需要的空氣溫度,可達850℃。