管道電加熱器的特點(dian)

通電(dian)(dian)發熱時(shi)表面不帶電(dian)(dian)。同時(shi)管(guan)道(dao)加熱器比其(qi)它(ta)形(xing)(xing)式電(dian)(dian)熱元件有許多優點(dian)，如它(ta)不僅結構(gou)簡單、用(yong)(yong)(yong)料省、成(cheng)本(ben)低，而且(qie)使(shi)用(yong)(yong)(yong)壽(shou)命長、機械強度高、熱效率高，同時(shi)節省電(dian)(dian)能，如電(dian)(dian)加熱導熱油爐等(deng)，使(shi)用(yong)(yong)(yong)安全(quan)，可(ke)以彎成(cheng)各種形(xing)(xing)狀、輕(qing)便(bian)、拆裝方便(bian)、用(yong)(yong)(yong)途廣(guang)泛，特(te)別適用(yong)(yong)(yong)于便(bian)攜型家用(yong)(yong)(yong)電(dian)(dian)熱器等(deng)。

管道加熱器

1.管道加熱器采用了不銹(xiu)鋼筒體(ti)，體(ti)積(ji)小、占地少、移動方便，具有較強的(de)抗腐蝕能力，在不銹(xiu)鋼內膽和不銹(xiu)鋼外(wai)殼之間采用了加厚保溫(wen)層，失溫(wen)程度低，保持溫(wen)度，節省電(dian)能。

2.高品質加熱元件（不(bu)銹鋼電加熱管）的主要零部(bu)件采用(yong)了進口(kou)材料，加工(gong)(gong)過程(cheng)也使(shi)用(yong)了先進的生產設備和工(gong)(gong)藝，配(pei)合不(bu)同電壓(ya)，發揮高性(xing)能。其絕緣性(xing)、耐壓(ya)性(xing)、防潮性(xing)均(jun)高于(yu)國家標準，使(shi)用(yong)安(an)全可靠。

3.水流方向設(she)計合理(li)，加熱均勻，無高(gao)、低(di)溫(wen)死角，熱效率高(gao)。

4.管道加熱(re)器(qi)安裝(zhuang)了國(guo)內知名(ming)品牌的(de)溫控器(qi)，用(yong)戶可以(yi)自(zi)由設置溫度(du)。全部(bu)配(pei)置過熱(re)保護器(qi)，用(yong)來控制(zhi)溫度(du)和(he)缺水超溫保護，避免加熱(re)元件及系統(tong)的(de)損壞。

電(dian)加熱器(qi)的感(gan)應加熱

利用導體處(chu)于交(jiao)變電(dian)(dian)(dian)磁場中產生(sheng)感(gan)應(ying)電(dian)(dian)(dian)流（渦流）所形成的(de)(de)熱(re)(re)(re)效(xiao)應(ying)使導體本(ben)身發熱(re)(re)(re)。根(gen)據不同(tong)的(de)(de)加(jia)(jia)熱(re)(re)(re)工(gong)(gong)(gong)藝(yi)要求，感(gan)應(ying)加(jia)(jia)熱(re)(re)(re)采用的(de)(de)交(jiao)流電(dian)(dian)(dian)源(yuan)的(de)(de)頻(pin)率有(you)工(gong)(gong)(gong)頻(pin)（50～60赫(he)(he)）、中頻(pin)（60～10000赫(he)(he)）和(he)高(gao)(gao)頻(pin)（高(gao)(gao)于10000赫(he)(he)）。工(gong)(gong)(gong)頻(pin)電(dian)(dian)(dian)源(yuan)就是通常工(gong)(gong)(gong)業上(shang)用的(de)(de)交(jiao)流電(dian)(dian)(dian)源(yuan)，世界(jie)上(shang)絕(jue)大多(duo)數國家的(de)(de)工(gong)(gong)(gong)頻(pin)為(wei)50赫(he)(he)。感(gan)應(ying)加(jia)(jia)熱(re)(re)(re)用的(de)(de)工(gong)(gong)(gong)頻(pin)電(dian)(dian)(dian)源(yuan)加(jia)(jia)到感(gan)應(ying)裝置(zhi)上(shang)的(de)(de)電(dian)(dian)(dian)壓必須是可(ke)調的(de)(de)。根(gen)據加(jia)(jia)熱(re)(re)(re)設(she)(she)備功率大小和(he)供電(dian)(dian)(dian)網容量大小，可(ke)以(yi)用高(gao)(gao)壓電(dian)(dian)(dian)源(yuan)（6～10千(qian)伏）通過變壓器供電(dian)(dian)(dian)；也可(ke)直(zhi)接(jie)將加(jia)(jia)熱(re)(re)(re)設(she)(she)備接(jie)在380伏的(de)(de)低(di)壓電(dian)(dian)(dian)網上(shang).

中(zhong)(zhong)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)源曾在較長時間內(nei)采用(yong)中(zhong)(zhong)頻(pin)(pin)(pin)發(fa)電(dian)(dian)(dian)(dian)(dian)機組(zu)(zu)。它由(you)(you)中(zhong)(zhong)頻(pin)(pin)(pin)發(fa)電(dian)(dian)(dian)(dian)(dian)機和驅動異步電(dian)(dian)(dian)(dian)(dian)動機組(zu)(zu)成。這種機組(zu)(zu)的(de)輸(shu)出功率一(yi)般在50～1000千瓦范圍內(nei)。隨(sui)著電(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)子(zi)技術(shu)的(de)發(fa)展，已(yi)使(shi)用(yong)的(de)是(shi)晶閘管變頻(pin)(pin)(pin)器(qi)中(zhong)(zhong)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)源。這種中(zhong)(zhong)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)(dian)源利用(yong)晶閘管先把工頻(pin)(pin)(pin)交(jiao)流電(dian)(dian)(dian)(dian)(dian)變換成直流電(dian)(dian)(dian)(dian)(dian)，再把直流電(dian)(dian)(dian)(dian)(dian)轉變成所需(xu)頻(pin)(pin)(pin)率的(de)交(jiao)流電(dian)(dian)(dian)(dian)(dian)。由(you)(you)于這種變頻(pin)(pin)(pin)設(she)備體(ti)積小，重量輕，無噪聲，運行可靠等(deng)，已(yi)逐漸取代了(le)中(zhong)(zhong)頻(pin)(pin)(pin)發(fa)電(dian)(dian)(dian)(dian)(dian)機組(zu)(zu)。

高(gao)(gao)頻電源(yuan)通常(chang)先用(yong)變壓器(qi)把三相 380伏的(de)(de)電壓升高(gao)(gao)到(dao)約2萬伏左(zuo)右的(de)(de)高(gao)(gao)電壓，然后用(yong)閘流(liu)管(guan)或高(gao)(gao)壓硅整(zheng)流(liu)元件把工頻交(jiao)流(liu)電整(zheng)流(liu)為直(zhi)流(liu)電，再用(yong)電子(zi)振蕩管(guan)把直(zhi)流(liu)電轉變為高(gao)(gao)頻率(lv)、高(gao)(gao)電壓的(de)(de)交(jiao)流(liu)電。高(gao)(gao)頻電源(yuan)設(she)備的(de)(de)輸出(chu)功(gong)率(lv)有從幾十千(qian)瓦到(dao)幾百千(qian)瓦。

感應加熱(re)的物體(ti)必須是導體(ti)。當高頻交(jiao)流電(dian)流通過導體(ti)時(shi)，導體(ti)產生趨(qu)膚效(xiao)應，即導體(ti)表面電(dian)流密度(du)大，導體(ti)中心電(dian)流密度(du)小。

感(gan)(gan)應加熱(re)(re)可(ke)對物體進行(xing)整體均勻(yun)加熱(re)(re)和表層加熱(re)(re)；可(ke)熔煉金屬；在(zai)高頻段，改變加熱(re)(re)線(xian)圈（又稱(cheng)感(gan)(gan)應器(qi)）的形(xing)狀，還可(ke)進行(xing)任(ren)意局部加熱(re)(re)。