呼吸机EvitaV300

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                    <section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><svg viewbox="0 0 1 1"></svg></section><section><section powered-by="gulangu"><p><strong>明日复明日，明日何其多。</strong></p></section><section powered-by="gulangu"><p>○</p></section><section powered-by="gulangu"><p><strong>无畏的太阳</strong></p></section><section powered-by="gulangu"><p>○</p></section><section powered-by="gulangu"><p><span>医疗|学习|钻研|电子电路|原理</span><br  /></p></section></section><section><svg viewbox="0 0 1 1"></svg></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p><img src="image/20201019/1b911756b4d32727bf62fce6cd64bdc3_1.jpg" /></p></section></section><section powered-by="gulangu"><p><strong>欢迎关注</strong></p></section></section><section><section powered-by="gulangu"><section><p><img src="image/20201019/46843bc84b845b4be88236dcefd9a71f_2.png" /></p></section></section><section powered-by="gulangu"><p><strong>好学医电在线</strong></p></section></section></section><section powered-by="gulangu"><p><strong>请留下你指尖的温度</strong></p><p><strong>让太阳拥抱你</strong></p><p><strong>记得这是一个有温度的公众号</strong></p></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><svg viewbox="0 0 1 1"></svg></section></section></section><section><section powered-by="gulangu"><section><section><svg viewbox="0 0 1 1"></svg></section></section></section></section><section><section powered-by="gulangu"><p><strong>呼吸机EvitaV300</strong></p></section></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><svg viewbox="0 0 1 1"></svg></section></section></section></section></section></section><section><section powered-by="gulangu"><section><svg viewbox="0 0 1 1"></svg></section></section></section></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><svg viewbox="0 0 1 1"></svg></section></section></section><section><section powered-by="gulangu"><section><p><strong>故障现象</strong></p></section></section></section></section><section powered-by="gulangu"><p><strong>开机，自检通过。但是呼吸机运行过程中频繁出现“MV过低（低分钟通气量）”、“压力限制！未达到VT（潮气量偏低没达到所设置的参数）”的报错。</strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/40b43ab94f437d074559e23aaa46c2aa_3.jpg" /></p></section></section><section powered-by="gulangu"><p><strong>科室反应将流量传感器往右推到位，用胶布固定住故障消失。反之一直出现以上故障。</strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/2cf7a5967a65224ed75813ad77e560ea_4.jpg" /></p></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><svg viewbox="0 0 1 1"></svg></section></section></section><section><section powered-by="gulangu"><section><p><strong><span>分析过程</span></strong><br  /></p></section></section></section></section><section powered-by="gulangu"><p><strong>&nbsp; &nbsp; &nbsp; &nbsp;一、原理</strong></p><p><strong><span>热丝式流量传感器检测原理：</span></strong></p></section><section powered-by="gulangu"><p><strong><span>将两根金属丝（在不同的温度下金属丝的电阻不同），放在被测气流中。</span></strong></p><p><strong><span>通过电流加热金属丝,使其温度高于流体的温度。</span></strong></p><p><strong><span>当有气流流过，会带走金属丝上面的部分热量，使金属丝温度下降，金属丝在气体中的散热量与流速有关。</span></strong></p><p><strong><span>散热量导致金属丝温度变化而引起阻值变化，流速信号即转变成电信号，经适当的信号变换和处理后计算出流量大小。</span></strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/688c373e17ff0bf0d5c39dbeebecfe0d_5.png" /></p></section></section><section powered-by="gulangu"><p><strong><span>热丝式流量传感器电路原理：</span></strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/4186b3faf3983b22e68e7cca8668fa92_6.png" /></p></section></section><section powered-by="gulangu"><p><strong><span>如图Rh、Rf为两根金属丝，当有气流流过，带走热量，引发它们阻值发生变化。</span></strong></p><p><strong><span>经运算放大器A1的正相、反相输入端，输出电压到运算放大器A2。</span></strong></p><p><strong><span>再由运算放大器A2输出偏置电压给三极管T，由三极管T放大后输出V01给两组金属丝加热，来达到恒温效果（保持金属丝热量达180°）。</span></strong></p><p><strong><span>最后将输出电压V01送到运算放大器A3的正相输入端，再由A3输出电压到后续电路里面分析、处理、计算、得出流量参数。</span></strong></p><p><strong><span>由A1?,A2?和三极管T构成的反馈回路,使金属丝工作于恒温状态下。</span></strong></p><p><strong><span>单位截面积中，流速越大，金属丝降温越快，那么，金属丝就需要更大的电量维持稳定的温度（180°C），使金属丝保持在180°C所需的能量代表流过传感器并使热丝冷却的气流的流量。</span></strong></p></section><section powered-by="gulangu"><p><strong>二、分析</strong><strong></strong></p><p><span><strong>自检能过，说明设备核心部件基本上没有问题。</strong></span></p><p><span><strong>根据科室所反应的，将流量传感器往右推到位，用胶布固定住故障消失。</strong></span></p><p><span><strong>可以将故障点锁定在以下：①流量传感器管脚与接口接触不良。</strong></span></p><p><span><strong>②流量传感器内部接口排线接触不良。</strong></span></p><p><span><strong>③内部微动开关没有推到位。</strong></span></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><svg viewbox="0 0 1 1"></svg></section></section></section><section><section powered-by="gulangu"><section><p><strong>解决方法</strong></p></section></section></section></section><section powered-by="gulangu"><p><strong>首先将前后面板4个螺丝卸掉，取下外壳，找到流量传感器接口连接线。</strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/e2b81b5ca1245285c25a9c692a47680c_7.jpg" /></p></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/8487710ba786f10fd8e3e91092d233e4_8.jpg" /></p></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><p><strong>万用表调至蜂鸣档测量其通断，均正常。传感器连接线一头四针，一头8针，四针这边一针对应8针那边2针，其中第八针没有连接。</strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/fefd8f5642b932392a85fdc1886e1d05_9.jpg" /></p></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/f6daefc131ded8f05a6bf52584f1a767_10.jpg" /></p></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/3b89af1e4c13198034d9b2cfa8c6f644_11.jpg" /></p></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><p><strong>测量微动开关正常。</strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/80374a1499395cb9759fc11a27a92f21_12.jpg" /></p></section></section><section powered-by="gulangu"><p><strong>装机模拟将流量传感器往右边推，它会往左弹回，再拆机发现是传感器内部线路太长，走线没有走好导致线蹩住，使其往左弹回，导致微动开关没有推到位，引发报错。重新走线后，故障消失。</strong></p></section><section powered-by="gulangu"><section><p><img src="image/20201019/09399fef4ddfae6e1defea34dadae616_13.jpg" /></p></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p>欢</p></section></section></section><section><section powered-by="gulangu"><section><p>迎</p></section></section></section><section><section powered-by="gulangu"><section><p>关</p></section></section></section><section><section powered-by="gulangu"><section><p>注</p></section></section></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p><img src="image/20201019/1b911756b4d32727bf62fce6cd64bdc3_1.jpg" /></p></section></section></section><section><section powered-by="gulangu"><section><section><svg viewbox="0 0 1 1"></svg></section></section></section></section><section><section powered-by="gulangu"><p>好学医电在线</p><p>和他的朋友们</p></section></section></section></section>