CFM56-3发动机燃油计量活门与高压燃油关断活门是一个吗？

gbhill · 发表于 2013-3-15 14:56:54

如果不是一回事，那么计量活门，高压燃油关断活门，还有低压燃油关断活门这三个活门的作用是什么呢，也就是说这三个活门流过的燃油是去哪里的，有什么用？请指教

wodepenyu · 发表于 2013-3-15 15:08:52

低压燃油关断活门？？维护的CFM56-7的没听说过。
发动机燃油计量活门与高压燃油关断活门不是一个，但是都在HMU内部，高压燃油关断活门只收启动手柄和火警手柄控制，发动机燃油计量活门是受EEC控制的

hjkl · 发表于 2013-3-15 21:32:10

我想，这张图能给出楼主想要的答案了

蔓蔓 · 发表于 2013-3-15 21:37:25

通过看帖子对我也是一次很好的学习

knavewalp · 发表于 2013-3-15 22:24:21

嗯，都在HMU内部，但不是一个，就像一楼说的一样，给你个手册的介绍吧，附一张HMU的说明图。
Fuel Metering Valve (FMV)
The EEC controls the FMV with servo fuel pressure from the
FMV EHSV. The FMV resolver sends the position of the FMV
back to the EEC. Fuel flow through the open FMV causes the
high pressure shutoff valve (HPSOV) to open.
High Pressure Fuel Shutoff Valve (HPSOV)
The high pressure shutoff valve (HPSOV) lets fuel flow from the
FMV to the fuel nozzles.
The start lever sends an open signal to the DEUs when it is in
the idle position. The DEU sends the open signal to the EEC.
The EEC causes the FMV to open. Fuel pressure from the open
FMV causes the HPSOV to open.
The start lever in the CUTOFF position energizes the HPSOV
solenoid. When HPSOV solenoid is energized, servo fuel closes
the HPSOV. Fuel pressure from the FMV can not open the
HPSOV when the HPSOV solenoid is energized. The fire handle
switch can also energize the HPSOV solenoid.
When the HPSOV closes, fuel flow to the fuel nozzles stop.
HMU原理.jpg

huohongliang · 发表于 2013-3-16 11:19:31

2楼4楼给的答案已经很详细了！

gbhill · 发表于 2013-3-16 13:34:37

那做发动机干冷转时，为什么先把启动手柄提到慢车位，然后再拔出燃油关断活门跳开关，再把启动手柄放回到关断位，这是为什么呢？

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[CFM] CFM56-3发动机燃油计量活门与高压燃油关断活门是一个吗？

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