6257rv7 发表于 2024-10-10 17:36:12

流程工业中的流量计-科氏力质量流量计


    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">科氏力质量流量计因其高精度（液体±0.1%/0.05%），多参量<span style="color: black;">测绘</span>（质量流量、密度、温度等等）、适用多种介质（液体、气体、浆液）等特点，在流程工业中有着极其广泛的应用；</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">1、</span>关于科里奥利力</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">科里奥利力（英语：Coriolis Force；简<span style="color: black;">叫作</span>科氏力）是一种惯性力，是对旋转体系中进行直线运动的质点<span style="color: black;">因为</span>惯性相<span style="color: black;">针对</span>旋转体系产生的直线运动的偏移的一种描述。此现象由法国著名数学家兼<span style="color: black;">理学</span>学家古斯塔夫·科里奥利<span style="color: black;">发掘</span>，因而得名。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">1.1生活中的科里奥利力</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">因为</span>自转的存在，地球并非一个惯性系，而是一个转动参照系，因而地面上质点的运动会受到科里奥利力的影响。地球科学<span style="color: black;">行业</span>中的地转偏向力<span style="color: black;">便是</span>科里奥利力在沿地球表面方向的一个分力。地转偏向力有助于解释<span style="color: black;">有些</span>地理现象，如河道的一边<span style="color: black;">常常</span>比另一边冲刷得更厉害（地转偏向力）。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">另一</span>，信风季风、热带气旋等等地理现象的存在，<span style="color: black;">亦</span>和科里奥利力关系密切。</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/fab044790c424867b899c7cd4b49667c~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=1c5x7CXgb9em65rjvRMQI8nNmFw%3D" style="width: 50%; margin-bottom: 20px;">
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">科里奥利力和热带气旋的形成</p>
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    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">1.2科里奥利力的应用</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">质量流量计让被<span style="color: black;">测绘</span>的流体<span style="color: black;">经过</span>一个转动<span style="color: black;">或</span>振动中的<span style="color: black;">测绘</span>管，流体在管道中的流动相当于直线运动，测量管的转动或振动会产生一个角速度，<span style="color: black;">因为</span>转动或振动是受到外加电磁场驱动的，有着固定的频率，因而流体在管道中受到的科里奥利力仅与其质量和运动速度<span style="color: black;">相关</span>，而质量和运动速度即流速的乘积<span style="color: black;">便是</span>需要<span style="color: black;">测绘</span>的质量流量，因而<span style="color: black;">经过</span><span style="color: black;">测绘</span>流体在管道中受到的科里奥利力，便<span style="color: black;">能够</span><span style="color: black;">测绘</span>其质量流量。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">如下图（左）所示，截取一根支管，流体在其内以速度 V从 A流向 B，将此管置于以角速度 ω 旋转的系统中。设旋转轴为 X，与管的交点为 O，<span style="color: black;">因为</span>管内流体质点在轴向以速度 V、在径向以角速度 ω运动，此时流体质点受到一个切向科氏力 Fc。这个力<span style="color: black;">功效</span>在<span style="color: black;">测绘</span>管上，在 O点两边方向相反，<span style="color: black;">体积</span>相同，为：δFc ＝ 2ωVδm</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">因此呢</span>，直接或间接<span style="color: black;">测绘</span>在旋转管道中流动的流体所产生的科氏力就<span style="color: black;">能够</span>测得质量流量。这<span style="color: black;">便是</span>科里奥利质量流量计的基本原理。</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/32e010bf76bd45368ee18fd88c0333e1~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=tdUvmi59ra1RgRXmzvmTjAU7sfE%3D" style="width: 50%; margin-bottom: 20px;">
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">科氏质量流量计的基本原理</p>
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    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">初期</span>设计的科氏力质量流量计的结构如上图（右）所示。将在由流动流体的管道送入一旋转系统中，由安装在转轴上的扭矩传感器，来完成质量流量的<span style="color: black;">测绘</span>。这种流量计只是在<span style="color: black;">实验</span>室中进行了试制。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">在商品化<span style="color: black;">制品</span>设计中，<span style="color: black;">经过</span><span style="color: black;">测绘</span>系统旋转产生科氏力是不切合<span style="color: black;">实质</span>的，因而均采用使<span style="color: black;">测绘</span>管振动的方式替代旋转运动。以此<span style="color: black;">一样</span>实现科氏力对<span style="color: black;">测绘</span>管的<span style="color: black;">功效</span>，并使得<span style="color: black;">测绘</span>管在科氏力的<span style="color: black;">功效</span>下产生位移。<span style="color: black;">因为</span><span style="color: black;">测绘</span>管的两端是固定的，而<span style="color: black;">功效</span>在<span style="color: black;">测绘</span>管上各点的力是<span style="color: black;">区别</span>的，所<span style="color: black;">导致</span>的位移<span style="color: black;">亦</span>各不相同，<span style="color: black;">因此呢</span>在<span style="color: black;">测绘</span>管上形成一个附加的扭曲。<span style="color: black;">测绘</span>这个扭曲的过程在<span style="color: black;">区别</span>点上的相位差，就可得到流过<span style="color: black;">测绘</span>管的流体的质量流量。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">高准(Micro Motion)<span style="color: black;">机构</span>于1977年发明了<span style="color: black;">第1</span>台用于工业的科氏力质量流量计。1984年，EMERSON收购了高准(Micro Motion)<span style="color: black;">机构</span>。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">2、</span>科里奥利质量流量计<span style="color: black;">测绘</span>管</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/8e1b0f69d5db45faa32316f2a98251a4~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=wymSPARf0n0lpwiIl%2BcMn0owiqo%3D" style="width: 50%; margin-bottom: 20px;">
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">各样</span>型式的<span style="color: black;">测绘</span>管</p>
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    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">从上图<span style="color: black;">能够</span>看到，科氏质量流量计的<span style="color: black;">测绘</span>管型式非常之多：有S 形<span style="color: black;">测绘</span>管、U 形<span style="color: black;">测绘</span>管、双 J 形<span style="color: black;">测绘</span>管、B 形<span style="color: black;">测绘</span>管、单直管形<span style="color: black;">测绘</span>管、双直管形<span style="color: black;">测绘</span>管、Ω形<span style="color: black;">测绘</span>管、双环形<span style="color: black;">测绘</span>管等。<span style="color: black;">为何</span>呢？</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">2.1质量流量计结构特性</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">在一个<span style="color: black;">测绘</span>系统中，流体质点<span style="color: black;">功效</span>在<span style="color: black;">测绘</span>管上的科氏力是很小的，这给精确的<span style="color: black;">测绘</span>带来很大的困难。为使<span style="color: black;">测绘</span>管产生足够强的信号，就应加大科氏力对测量管的<span style="color: black;">功效</span>或在<span style="color: black;">一样</span>的科氏力的<span style="color: black;">功效</span>下增大<span style="color: black;">测绘</span>管的变形。从原理上讲 Fc＝2ωVM，在被测流体一<span style="color: black;">按时</span>，<span style="color: black;">仅有</span>加大ω或 V，<span style="color: black;">才可</span><span style="color: black;">加强</span>Fc。<span style="color: black;">实质</span>中ω的<span style="color: black;">增多</span>，在仪表上就需要<span style="color: black;">加强</span>振动频率和振动的振幅。（当然振动频率的<span style="color: black;">加强</span>，严重地影响<span style="color: black;">测绘</span>管的寿命，而振幅的<span style="color: black;">加强</span>就需<span style="color: black;">供给</span><span style="color: black;">很强</span>的动力。V 的<span style="color: black;">增多</span><span style="color: black;">便是</span><span style="color: black;">增多</span>流速（<span style="color: black;">例如</span>流量计缩颈），<span style="color: black;">这般</span>即<span style="color: black;">增多</span>了<span style="color: black;">测绘</span>管上的静压，<span style="color: black;">亦</span>增大流量计对<span style="color: black;">全部</span>系统的压力损失。这些对流量计本身和<span style="color: black;">全部</span>系统都是<span style="color: black;">有害</span>的。）</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">区别</span><span style="color: black;">测绘</span>管的型式，在<span style="color: black;">一样</span>的振动频率的<span style="color: black;">状况</span>下，振幅是不尽相同的，<span style="color: black;">因此呢</span>，得到的科氏力<span style="color: black;">亦</span>是<span style="color: black;">区别</span>的。下面<span style="color: black;">咱们</span><span style="color: black;">选取</span>几种常用的分别对其结构作一简单介绍。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">2.1.1单直管形质量流量计</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/dd56c5b6a9cb408d8ccf31d07eec1e77~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=k79n03w6hOcaIaOzeyFn%2F1gF5Sk%3D" style="width: 50%; margin-bottom: 20px;">
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">单直管的质量流量计</p>
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    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">这种流量计的结构如上图所示，<span style="color: black;">测绘</span>系统由一两端固定（法兰）的直管及其上的振动驱动器<span style="color: black;">构成</span>。①为<span style="color: black;">测绘</span>管②为驱动线圈（振动驱动器）③④为传感器（负责检测<span style="color: black;">测绘</span>管相位偏移）</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">在管中流体不流动时，驱动器使管子振动，管中流体不产生科氏力，A、B两点受力相等，变化速度相同，如下图。</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/4d9ecbb14b8c4d4391d22d5e2083e678~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=dLnPLfNWqtjWmNmdGbyLAj8BdhI%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">当<span style="color: black;">测绘</span>管中流体以速度 V在管中流动时，<span style="color: black;">因为</span>受到 C点振动力的影响（此时的振动力是向上的），流体质点从 A点运动到 C点时被加速，质点产生反<span style="color: black;">功效</span>力 F1，使管子向上运动速度减慢；而在 C点到 B点之间，流体质点被减速，使管子向上的运动速度加快。结果在C点两边的这两个方向相反的力使管子产生一个变形，这个变形的相位差与测管中流体流过的质量流量成正比。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">特点：</span></span></p><span style="color: black;"><span style="color: black;">流通能力优异</span></span><span style="color: black;"><span style="color: black;">压损小</span></span><span style="color: black;"><span style="color: black;">自排空，易于排污，易于清洗</span></span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">因此呢</span>，<span style="color: black;">尤其</span>适用于卫生型行业、易堵塞、结晶的介质<span style="color: black;">测绘</span>。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">2.1.2微弯管形质量流量计</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/54ba2649c82e4c559db292f365ae411f~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=PZCDORjzrzHZVPxDn5Gmz0tbfbQ%3D" style="width: 50%; margin-bottom: 20px;">
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">微弯管型质量流量计的内部结构</p>
    </div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">这种流量计的结构如上图所示，<span style="color: black;">测绘</span>系统由一两端固定（法兰）的两根平行<span style="color: black;">安置</span>弯管及其上的振动驱动器<span style="color: black;">构成</span>。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">流体流经传感器，传感器内两根平行<span style="color: black;">安置</span>的<span style="color: black;">测绘</span>管反相振动，类似音叉动作。<span style="color: black;">测绘</span>管在科氏力作 用下<span style="color: black;">出现</span>形变，<span style="color: black;">引起</span><span style="color: black;">测绘</span>管两端<span style="color: black;">显现</span>相位差（参见下图）：• 流量为 0 时（流体静止不动），两根<span style="color: black;">测绘</span>管同相振动，无相位差（1）。• 质量流量使得<span style="color: black;">测绘</span>管在入口处（2）振动加速，在出口处（3）振动减速，产生相位差 （2）-（3）。</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p26-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/8d73a9911e5b4461931ff09a2ec3bea8~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=%2F0NRLWx9JOG9hHOP9xdSDPiUlx4%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">2.1.3 U形<span style="color: black;">测绘</span>管质量流量计</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/2483c7e8115743aaa34aa4795a041a1f~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=rLic1%2FN58jsR6%2Bf1LPGvXoJMSEI%3D" style="width: 50%; margin-bottom: 20px;">
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">U型管质量流量计超低温应用</p>
    </div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">U形管为单、双<span style="color: black;">测绘</span>管两种结构，单<span style="color: black;">测绘</span>管型工作原理如下图</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/ca394acaea9b4a8180ebe686cff7a6e2~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=vVExrincn2nhWK0fbszO6LNGj0w%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/abe9bacaa86744ab859e8e32660fc6a1~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=YglKfBCulIWkyC0kyc73KbYwrng%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">电磁驱动系统以固定频率驱动 U 形<span style="color: black;">测绘</span>管振动，当流体被强制接受管子的垂直运动时，在前半个振动周期内，管子向上运动，<span style="color: black;">测绘</span>管中流体在驱动点前产生一个向下压的力，阻碍管子的向上运动，二在驱动点后产生向上的力，加速管子向上运动。这两个力的合成，使得<span style="color: black;">测绘</span>管<span style="color: black;">出现</span>扭曲；在振动的<span style="color: black;">另一</span>半周期内，扭曲方向则相反。</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/75f0edb3f00d4d01b333223f628254ae~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=meAe6wlXlkSoEjLLAugYtBT73Eg%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">测绘</span>管扭曲的程度，与流体流过<span style="color: black;">测绘</span>管的值来质量流量成正比，在驱动点两侧的<span style="color: black;">测绘</span>管上安装电磁感应器，以<span style="color: black;">测绘</span>其运动的相位差，这一相位差直接正比于流过的质量流量。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">在双 U 形<span style="color: black;">测绘</span>管结构中，两根<span style="color: black;">测绘</span>管的振动方向相反，使得<span style="color: black;">测绘</span>管扭曲相位相差180 度。相对单<span style="color: black;">测绘</span>管型<span style="color: black;">来讲</span>，双管型的检测信号有所放大，流通能力<span style="color: black;">亦</span>有所<span style="color: black;">加强</span>。</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/607e64dbf58343ad9a9ed8a075885ea5~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=G0CYU5RS%2FiCPxm1ryRDE1UKz0y4%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">2.1.4 Ω形<span style="color: black;">测绘</span>管质量流量计</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">这种流量计的结构如下图所示，驱动器放在直管部分的中间位置，当管中流体以<span style="color: black;">必定</span>速度流动时，<span style="color: black;">因为</span>驱动器的振动<span style="color: black;">功效</span>，使管子<span style="color: black;">掰开</span>或靠近。</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p26-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/66197812ae1d47e08d72ef3e3a9f6dd8~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=%2FbHpcqrpBNeKT6lErzZRKZt%2Bajs%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">当管子<span style="color: black;">掰开</span>时，在振点前的流体中产生的科里奥利力与振动力方向相反，减慢管子的运动速度；而在振点之后管中流体产生的科氏力与振动方向相同，加快管子的运动速度。当驱动器使管子靠近时，则产生相反的结果。在A、B两点的传感器可测的两处管字运动的相位差，由此可得到流过测管中流体的质量流量。</span></span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/ff204a647e084e27be92e1d52891cace~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=OzFHvaNBS3I9sH%2BiRPZV17X84gU%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-qvj2lq49k0/01ae763d87564eddb157373fd5167ef0~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1728818701&amp;x-signature=vPrHv5IzDrGkK0pvW4uglUKXqww%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">3、</span><span style="color: black;">测绘</span>管结构对性能的影响</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">3.1 <span style="color: black;">测绘</span>管的形状：</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">测绘</span>系统弹性的<span style="color: black;">增多</span>，增大了<span style="color: black;">功效</span>于振动管系统的科氏力的效应，但<span style="color: black;">亦</span>增大外界机械噪声的干扰和仪表体积。<span style="color: black;">测绘</span>管应<span style="color: black;">尽可能</span>减少急剧弯曲，最大可能的增大<span style="color: black;">测绘</span>管内径，<span style="color: black;">这般</span><span style="color: black;">能够</span>减少压力损失。双<span style="color: black;">测绘</span>管型的信噪比得到<span style="color: black;">增多</span>，流通能力<span style="color: black;">亦</span><span style="color: black;">增多</span>，被<span style="color: black;">广泛</span>采用。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">3.2管壁</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">壁厚<span style="color: black;">增多</span>使管子更<span style="color: black;">拥有</span>刚性，<span style="color: black;">亦</span><span style="color: black;">增多</span>了流动时管子的固定质量，减少了流体中夹杂气体时，<span style="color: black;">因为</span>其分布的不均匀<span style="color: black;">导致</span>比重变化对管子振动的影响，<span style="color: black;">同期</span><span style="color: black;">加强</span><span style="color: black;">测绘</span>管耐压、耐磨性，但会降低系统弹性，影响<span style="color: black;">测绘</span>的灵敏性。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">3.3制造和安装</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">测绘</span>管的形状在制作过程应<span style="color: black;">保准</span>其对<span style="color: black;">叫作</span>性，在双<span style="color: black;">测绘</span>管结构中应<span style="color: black;">保准</span>两根管的一致性，传感器的定位要准确，以减少<span style="color: black;">测绘</span>中<span style="color: black;">因为</span>密度或粘度变化对<span style="color: black;">测绘</span>结果的影响。流量质量分配的不稳定性，给<span style="color: black;">测绘</span>结果的准确性带来影响。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">从原理上讲，<span style="color: black;">测绘</span>管所受科氏力的<span style="color: black;">体积</span>只与流体的质量流量<span style="color: black;">相关</span>，与流体密度、粘度无关。但密度的变化会带来附加的惯性力；而粘度的变化时<span style="color: black;">测绘</span>管的内壁附着层<span style="color: black;">区别</span>，产生<span style="color: black;">区别</span>的边界层效应。结果<span style="color: black;">导致</span><span style="color: black;">测绘</span>管的质量分配不稳定，对<span style="color: black;">测绘</span>结果的准确度带来影响。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">以上</span><span style="color: black;">文案</span>，参考了中国计量<span style="color: black;">科研</span>院流量室，李旭老师的“科氏力质量流量计的工作原理和典型结构特性”的专业<span style="color: black;">文案</span>，<span style="color: black;">这里</span>感谢！如<span style="color: black;">触及</span>侵权，请联系<span style="color: black;">咱们</span>删除，谢谢！</span></span></p>
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nykek5i 发表于 2024-10-24 12:17:01

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