低压燃油关断活门分析
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<em><span style="color: rgb(255, 255, 255);">前言
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<span style="font-size: 15px;">干航线机务的都知道这个活门是通电关闭，断电打开，所谓失效保护设计。其实这活门的打开和关闭都是要用电的。
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<span style="font-size: 17px; color: rgb(0, 133, 121);">正文</span>
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<p><br></p></section><div align="center"></div><div align="center">这是一个球形活门，由两个串励直流马达驱动开和关。</div><div align="center"> </div><div align="center"><br></div><div align="center"><br></div><div align="center"></div><div align="center"><div align="left">①当发动机主电门在OFF位或者发动机火警电门在摁入位（PUSH）的任一条件被满足则燃油低压活门就转到关闭位。活门内的位置传感器把活门位置信号发送到SDAC计算机处理用于在EACM页面显示给机组看当前活门开关状态。</div><div align="left"><br></div></div><div align="center"><div align="left">②当发动机主电门在ON位，火警电门在正常位（NORMAL）同时被满足，则燃油低压活门就转到打开位.活门内的位置传感器把活门位置信号发送到SDAC计算机处理用于在EACM页面显示给机组看当前活门开关状态</div></div><div align="center"> </div><div align="center"></div><div align="center"><br></div><div align="center"><br></div>
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<span style="font-size: 17px; color: rgb(0, 133, 121);">知识点</span>
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<div align="center"><div align="left"></div></div><div align="center"><div align="left">①汇流条（电）</div></div><div align="center"><div align="left">②跳开关1和2是跳开关触点用于供电</div></div><div align="center"><div align="left">③3和4也是跳开关触点用于监控跳开关状态</div></div><div align="center"><div align="left">④开关圆形触点表示可以自动保持的触点</div></div><div align="center"><div align="left">⑤开关三角型触点表示不能自动保持的触点</div></div><div align="center"><div align="left">⑥继电器线圈</div></div><div align="center"><div align="left">⑦串励直流马达</div></div><div align="center"><div align="left">⑧壳体接地点</div></div><div align="center"><div align="left">⑨导线交叉并相连</div></div><div align="center"><div align="left">⑩导线交叉但不相连</div></div><div align="center"><div align="left">⑪接地</div></div><div align="center"><br></div>
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分析一个电路就是找电找地，弄清怎么形成一个回路的过程。
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<span style="font-size: 17px; color: rgb(0, 133, 121);">讨论</span>
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<p><br></p></section><div align="center"><div align="left">❶当主电门在OFF，火警电门在NORMAL位时，12QG继电器线圈X1和X2得电产生磁力把开关往下吸保持在三角形触点，接通A2和A1，B2和B1，继而接通低压燃油关断活门作动器的SHUT回路，使活门关闭。
</div></div><div align="center"><div align="left">❷当主电门在ON位，火警电门在NORMAL位时，12QG继电器线圈X1和X2失电，无磁力产生，开关恢复保持在圆形触点。A2和A3,B2和B3接通，继而接通低压燃油关断活门作动器的OPEN回路,使活门打开。</div></div><div align="center"><div align="left">❸当发动机发生火警时，人工摁压1WD火警电门，则汇流条401PP和202PP供的电通过火警电门h,j和b,c，绕开继电器12QG直接供到作动器SHUT回路关闭活门。</div></div><div align="center"><div align="left">❹主电门在OFF，火警电门在NORMAL位，人工拔出跳开关1KC2（供电），12QG继电器线圈X1和X2失电，无磁力产生，开关恢复保持在圆形触点。A2和A3,B2和B3接通，继而接通低压燃油关断活门作动器的OPEN回路,使活门打开。</div></div><div align="center"><br></div><div align="center"></div><div align="center"><br></div><div align="center"><div align="left">第❹种情况就是为什么在更换发动机燃油滤时AMM手册要求确认相关发动机的跳开关要在闭合位，而不是我们常见的更换件时一般都是拔出跳开关的操作。因为这里一旦在整机上电的情况下拔出1KC，而不是确认其在摁入位，就会让低压燃油活门打开，那么拆卸油滤时，在重力的作用下，大翼油箱内的大量燃油将会泄露，导致不安全事件的发生。</div></div><div align="center"><div align="left"> </div>
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<span style="font-size: 17px; color: rgb(0, 133, 121);">感悟</span>
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<div align="center"><div align="left">干活还得先仔细看手册，切不可思维定势，得严格按照手册施工。</div></div>
:):) xuexi
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