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href="http:///">首頁(yè)</a> >> <a href="http:///news/">新聞中心</a> >> <a href="http:///news/jszx30f/">技術(shù)知識(shí)</a> </div> </div> <div id="d0vtihn77sl" class="content">  <div id="d0vtihn77sl" class="news_detail"> <h1 class="title">電熱管優(yōu)劣的識(shí)別方法及質(zhì)量的辨別</h1> <div id="d0vtihn77sl" class="info_title clearfix"> <h3 class="title_bar"> 發(fā)布日期：<span>2019-08-17</span> 作者：<span>上海雄雷環(huán)保科技有限公司</span> 點(diǎn)擊：<span><script src="http:///data/include/newshits.php?id=437"></script></span> </h3> <div id="d0vtihn77sl" class="share">  <div id="d0vtihn77sl" class="bdsharebuttonbox"> <a href="#" class="bds_more" data-cmd="more"></a> <a href="#" class="bds_qzone" data-cmd="qzone"></a> <a href="#" class="bds_tsina" data-cmd="tsina"></a> <a href="#" class="bds_tqq" data-cmd="tqq"></a> <a href="#" class="bds_renren" data-cmd="renren"></a> <a href="#" class="bds_weixin" data-cmd="weixin"></a> </div> <script> window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdPic":"","bdStyle":"0","bdSize":"16"},"share":{},"image":{"viewList":["qzone","tsina","tqq","renren","weixin"],"viewText":"分享到：","viewSize":"16"},"selectShare":{"bdContainerClass":null,"bdSelectMiniList":["qzone","tsina","tqq","renren","weixin"]}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)]; </script>  </div> </div> <div id="d0vtihn77sl" class="content"><p style="line-height: 2em; text-indent: 2em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"><a href='http:///' target='_blank' class='key_tag'><font color=#2086ee><strong>電熱管</strong></font></a>優(yōu)劣的識(shí)別方法及質(zhì)量的辨別</span></p><p style="line-height: 2em; text-indent: 2em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;">驗(yàn)證電熱管優(yōu)劣最直觀的方法是：先將電熱管表面擦凈，然后接通交流220V電源，在空氣中干燒，表面發(fā)紅后斷電，待電熱管完全冷卻后，用餐巾紙擦拭，白紙上應(yīng)無(wú)黑色氧化粉末（未與空氣中的氧氣反應(yīng)），說(shuō)明此電熱管為優(yōu)質(zhì)電熱管。</span></p><p style="line-height: 2em; text-indent: 2em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> 電熱管質(zhì)量的好壞主要取決于以下幾個(gè)方面：電氣強(qiáng)度、絕緣、泄漏電流、功率準(zhǔn)確性、壽命、耐腐蝕性、尺寸外觀等。</span></p><p style="text-align:center"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"><img src="/data/upload/image/20190115/1547541537165281.jpg" alt="電熱管" width="600" height="401" border="0" vspace="0" title="電熱管" style="width: 600px; height: 401px;"/></span></p><p style="line-height: 2em; text-indent: 2em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> 1 電氣強(qiáng)度：影響電熱管電氣強(qiáng)度的因素主要包括絕緣層的厚度、絕緣層的原料質(zhì)量、電熱管的長(zhǎng)度、彎曲的半徑及彎曲的R部個(gè)數(shù)?，F(xiàn)在在電熱管的冷態(tài)耐壓上一般都要求達(dá)到2000V/1s擊穿電流0.5mA。</span></p><p style="line-height: 2em; text-indent: 2em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> 2 絕緣：影響電熱管絕緣的主要是電熱管的封口工藝。一般高溫粉封口后至少要達(dá)到104MΩ，中溫鎂粉及中低溫鎂粉或改性粉要達(dá)到103 MΩ。</span></p><p style="line-height: 2em; text-indent: 2em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> 3 泄漏電流：主要與電熱管使用時(shí)的溫度電熱管的使用電壓電熱管的發(fā)熱長(zhǎng)度及鎂粉質(zhì)量好壞等有關(guān)。這也是對(duì)高溫電熱管的一個(gè)重要考核指標(biāo)。</span></p><p style="line-height: 2em; text-indent: 2em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> 4 功率準(zhǔn)確性：主要與電阻絲的質(zhì)量、制造廠的工藝水平有關(guān)。一般在批量投產(chǎn)前都需要做溫度系數(shù)的試驗(yàn)，以確定合格的功率范圍的冷態(tài)電阻。</span></p><p style="line-height: 2em; text-indent: 2em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> 5 壽命：電熱管的壽命除了與電阻絲質(zhì)量有關(guān)外，還與氧化鎂的質(zhì)量（及管材質(zhì)的選擇相關(guān)），電阻絲直徑的選擇等因素有關(guān)。對(duì)于空干燒電熱管制造表面負(fù)荷最好控制在8W/cm2以內(nèi)。在選擇電阻絲的直徑時(shí)，需計(jì)算電阻絲的表面負(fù)荷以達(dá)到壽命要求。</span></p><p style="line-height: 2em; text-indent: 2em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> 6 耐腐蝕性：是水加熱電熱管與空干燒電熱管經(jīng)常遇到的問(wèn)題。除了合理的選擇（管）材質(zhì)之外，還與電熱管的熱處理，電熱管的表面狀態(tài)等有關(guān)。</span></p><p style="line-height: 2em; text-indent: 2em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 16px;"> 7 尺寸外觀：符合客戶的裝配要求，反映出工廠技術(shù)、制造、工裝保障能力的好壞同時(shí)外觀也能體現(xiàn)出產(chǎn)品的檔次和制造水平。</span></p></div> <h3 class="tag">本文網(wǎng)址：http:///news/437.html </h3> <h3 class="tag">關(guān)鍵詞：<a href="http:///tag/%E7%94%B5%E7%83%AD%E7%AE%A1%E4%BB%B7%E6%A0%BC">電熱管價(jià)格</a>,<a href="http:///tag/%E7%94%B5%E7%83%AD%E7%AE%A1%E5%8E%82%E5%AE%B6">電熱管廠家</a>,<a href="http:///tag/%E7%94%B5%E7%83%AD%E7%AE%A1%E5%AE%9A%E5%88%B6">電熱管定制</a> </h3> <div id="d0vtihn77sl" class="page">上一篇：<a href="http:///news/436.html">電熱管常識(shí)</a><br />下一篇：<span><a href="http:///news/442.html">金屬電加熱管的應(yīng)用</a></span></div> </div> <div id="d0vtihn77sl" class="relateproduct relate"><h4>最近瀏覽：</h4> <div id="d0vtihn77sl" class="content"> <ul id="relate_n" class="news_list clearfix"> </ul> 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