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} }); function showliuyan(me, showtype){ if(showtype==0){ //$("#Content").val($("#Content").attr('placeholder')); Content= document.getElementById('PopMsgFrom').Content.getAttribute('placeholder'); document.getElementById('PopMsgFrom').Content.value=Content; } if(showtype==1){ // $("#Content").val($(me).text()); alert($(me).text()); document.getElementById('PopMsgFrom').Content.value=$(me).text(); } $(".fxp").css("display","flex"); } function close_popwin(){ $(".fxp").css("display","none"); // 关闭虚拟电话后的留言� $(".dhxj").css("display","none"); $(".dhxjbox").css("display", "none"); $(".dhxjbox2").css("display", "none"); return false; } </script>  <div class="cpjs"> <div class="cpjs_tab"> <div class="js_cpjj" style="border-bottom: 3px solid #1479d7; color: #1479d7;">产品介绍</div> <div class="js_cxd">创新炸�/div> <div class="js_xgfa">相关方案</div> <div class="js_xgzl">相关资料</div> <div class="js_yhpl">用户评论</div> <div class="js_gsdt">公司动�?/div> <div class="js_wsj">问商宵�/div> </div> <script> $(function(){ // 切换 $(".cpjs_tab a").click(function(){ $(".cpjs_tab a").css({"color":"#4F5862","border-bottom-color":"transparent"}); $(this).css({"color":"#1479d7","border-bottom-color":"#1479d7"}); }); }); </script>  <div class="cpjj"> <p><span style="color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" background-color:="">螺纹管也叫低肋管。螺纹管主要依靠外肋(肋系数为2-3)来扩大传热面积。螺纹管一般用于管内传热系数是管外传热系数两倍以上的场合。螺纹管对于管外的冷凝和沸腾，由于表面张力的作用，有很好的强化作用。螺纹和折流板的组合不仅可以减小换热管的振动，而且可以使错流换热器的传热系数提�?0%左右，管束压降降�?0%。常用于热交换设备、蒸发和冷凝设备、压缩空气设备、化工等领域、�/span><br style="box-sizing: border-box; animation-fill-mode: both; padding: 0px; margin: 0px; color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" white-space:="" background-color:=""/><span style="color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" background-color:="">螺纹管相比光管有什么优势？主要体现在其性能特点上。如下所礹�</span><br style="box-sizing: border-box; animation-fill-mode: both; padding: 0px; margin: 0px; color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" white-space:="" background-color:=""/><span style="color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" background-color:="">①由于螺纹槽的形成，管内气流形成涡流，增强了湍流状态下的对流传热能力；</span><br style="box-sizing: border-box; animation-fill-mode: both; padding: 0px; margin: 0px; color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" white-space:="" background-color:=""/><span style="color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" background-color:="">②由于螺纹槽的存在，管道表面变得粗糙，破坏了空气流动的边界层，明显改善了空气在层流中的对流换热；</span><br style="box-sizing: border-box; animation-fill-mode: both; padding: 0px; margin: 0px; color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" white-space:="" background-color:=""/><span style="color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" background-color:="">(3)均匀的螺纹槽可以大大增加传热管的传热表面积；</span><br style="box-sizing: border-box; animation-fill-mode: both; padding: 0px; margin: 0px; color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" white-space:="" background-color:=""/><span style="color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" background-color:="">④螺纹管的固有频率高于光管，降低了换热器的振动、�/span><br style="box-sizing: border-box; animation-fill-mode: both; padding: 0px; margin: 0px; color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" white-space:="" background-color:=""/><span style="color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" background-color:="">除了以上四个性能优势，不锈钢螺纹管还因为不锈钢而具有一些优势。众所周知，不锈钢制品具有良好的耐酸碱、耐腐蚀性能，使用寿命长，外形美观。它们是替代传统碳钢、铝和铜制品的环保产品，是化工、医疗和容器设备制造商的理想选择、�/span><br style="box-sizing: border-box; animation-fill-mode: both; padding: 0px; margin: 0px; color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" white-space:="" background-color:=""/><span style="color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" background-color:="">螺旋钢管全称为螺旋焊接钢管。它是一种螺旋钢管，采用自动双面埋弧焊技术，以带钢卷为原料，常采用温挤压成型和双面自动埋弧焊技术。表面有螺旋焊缝的称为螺旋焊管。螺纹管是指钢管的外表面用压花设备压制而成。螺纹管又称低肋管，主要依靠外肋�?肋系数为2-3)来扩大换热面积，通常在管内传热系数比管外�?倍以上时使用、�/span><br style="box-sizing: border-box; animation-fill-mode: both; padding: 0px; margin: 0px; color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" white-space:="" background-color:=""/><span style="color: rgb(112, 112, 112); font-family: " microsoft="" font-size:="" background-color:="">不锈钢螺纹管是一种环保产品，替代了传统的碳钢、铝和铜制品。该产品使用寿命长，外形美观，耐酸碱，耐腐蚀。由于螺纹管的表面张力，对管外冷凝和沸腾也有很好的强化作用。螺纹和折流板的组合不仅可以减轻换热器的振动问题，而且错流换热器的系数比弓形折流板�?0%左右，管束的压降�?0%左右、�/span></p> </div>  <div class="cxd"> <div class="cxd_tit"><span></span>创新炸�/div> <p style=" color: #333; font-size: 14px; margin: 10px 0 0; line-height: 26px;"> 暂无数据� </p> </div>  <div class="xgfa"> <div class="xgfa_tit"> <div> <span></span>相关方案 </div> </div> <div class="xgfa_box" style="display: block;"><div style="padding:10px;">暂无相关方案、�/div> </div> </div> <script> $(function(){ // 切换 $(".xgfa_tit_ul li").hover(function(){ $(".xgfa_tit_ul li").css({"color":"#4F5862","border-bottom-color":"transparent"}); $(this).css({"color":"#1479d7","border-bottom-color":"#1479d7"}); var _index = $(this).index(); $(".xgfa_box").css("display","none"); $(".xgfa_box").eq(_index).css("display","block"); }); }); </script>  <div class="xgzl"> <div class="cxd_tit"><span></span>相关资料</div> <div class="xgzl_box"><div style="padding:10px;">暂无数据、�/div> </div> </div>  <div class="yhpl"> <div class="cxd_tit"><span></span>用户评论</div> <form id="FormComments" action="" method="post" onsubmit="return false"> <input name="SaveProComments" id="SaveProComments" type="hidden" value="yes" /> <input name="ProductID" id="ProductID" type="hidden" value="331208" /> <input name="ProQuality" id="ProQuality" type="hidden" value="10" /> <input name="ProService" id="ProService" type="hidden" value="10" /> <input name="ProUsability" id="ProUsability" type="hidden" value="10" /> <input name="ProCostperformance" id="ProCostperformance" type="hidden" value="10" /> <div class="yhpl_pf"> <div> <p>产品质量</p> <div><span id="Quality" class="stars star10"></span><span id="Quality_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> <div> <p>售后服务</p> <div><span id="Service" class="stars star10"></span><span id="Service_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> <div> <p>易用�?/p> <div><span id="Usability" class="stars star10"></span><span id="Usability_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> <div> <p>性价毓�/p> <div><span id="Costperformance" class="stars star10"></span><span id="Costperformance_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> </div> <div class="yhpl_pftit">评论内容</div> <textarea name="Comments" id="ProComments" onfocus="checklogin();" placeholder="分享产品使用经验/采购评价（不超过500字）">