738的安全释压活门和负压释放活门大体干啥用的？

扯几吧蛋 · 发表于 2013-9-15 07:35:46

这两个飞机尾部外部的活门大体是起什么作用？

icydream456 · 发表于 2013-9-15 08:22:45

作用都是平衡调节机内机外压差，保护机身结构。安全活门也叫做正释压活门，机内压力大于机外一定数值之后，打开起到平衡作用，738有两个。负释压活门原理一样，调节相反，有一个活门。正常情况下都保持在关闭位，如果异常，就得留意。

513886089 · 发表于 2013-9-15 10:14:19

这个得学学

大雄宝剑 · 发表于 2013-9-15 10:51:12

不错的帖子，就是广告太烦人

ke408219905 · 发表于 2013-9-15 11:04:22

负释亚活门：The negative pressure relief valve prevents negative differential pressure (vacuum pressure) damage to the airplane structure. This can prevent structure damage during a rapid descent.
正释亚活门：The positive pressure relief valves are fail safe devices that bleed fuselage pressure overboard if the aft outflow valve fails closed.

The positive pressure relief valves are mechanical devices and operate independently. They do not interface with other airplane pressurization systems and no crew action is necessary.

The positive pressure relief valves are pneumatically operated by cabin-to-ambient pressure differential. They control pressure to a nominal 8.95 +/- 0.15 psi more than ambient.

When the differential pressure is too high, the valve opens. The open valve lets air out of the airplane. This relieves the cabin pressure. When the cabin-to-ambient pressure is safe, the valve closes.

The positive pressure relief valves have filters. The filters clean the air used in the internal servo and actuator mechanisms.

They attach to pedestals with gaskets and flange clamps.

拂面清风 · 发表于 2013-10-19 19:20:05

保护机身机构

wanglei8291 · 发表于 2013-12-24 10:15:45

1楼解释清晰

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[21空调] 738的安全释压活门和负压释放活门大体干啥用的？

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中国民航大学

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