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[36气源] B737NG引气系统压力限制和标称值汇总

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发表于 2019-7-17 19:13:06 | 显示全部楼层 |阅读模式
以下来自SDS

36-00-00 引气系统概述

(1)给引气系统供压的限制
Training Information Point
Do not supply more than 75 psi of pressure to the pneumatic system. If you supply too much pressure, damage to equipment and injuries to personnel can occur.


36-11-00 高压级调节器/活门

(2) 转子提速过程中,9级输出达到32 psi以后,高压级活门将下游压力调定到32 psi
The control pressure from the high stage regulator goes to chamber A of the high stage valve. The actuator opens the valve against spring force and pressure in chamber B. The combination of forces that operate on the actuator cause the valve to regulate the downstream pressure to 32 psi (nominal).


(3)当5级总管压力大于34 psi,活门关闭
When 5th stage manifold pressure is greater than the high stage regulated pressure (nominal 34 psi), the high stage valve closes because the force in chamber B, combined with the spring force, is greater than the force in chamber A. This causes the high stage valve to close.


(4) 转子继续提速,9/5级转换后,引气关断机构工作,从而延长调定器(regulator)的寿命
The pneumatic shutoff mechanism increases the life of the high stage regulator. The shutoff operates after the shift to 5th stage engine supply occurs. High pressures (110 psig) in the supply port operate a shutoff mechanism. The shutoff mechanism closes the supply to the regulator inlet and vents the regulator. This reduces the duty cycle of the regulator and exposure to extreme pressures and temperatures during high engine power operation.


(5) 9/5级转换以后,总管压力继续上升,PRSOV调节引气输出到42 psi
The PRSOV controls the flow of bleed air from the engine. These are the PRSOV control functions:
• Shutoff of engine bleed air
• Pressure regulation of engine bleed air (42 psi nominal)
• Temperature limitation of engine bleed air (450F/232C).


The latching solenoid controls the flow of air to chamber A of the PRSOV actuator and the 450F thermostat. The PRSOV actuator opens the valve against spring force and pressure in chamber B. The combination of forces on the actuator cause the valve to regulate the downstream pressure to 42 psi (nominal).


(6)引气调节器的超压保护门限值为220 psi
The BAR has these parts:
• Mechanical latching solenoid valve
• Pressure relief valve
• 220 psi overpressure switch
• Ports for supply and control air lines.


The overpressure switch is a safety device. If supply air to the BAR gets to 220 psi, the switch closes and causes a bleed trip off condition.


(7)ACAU中的继电器,响应BAR中的220 psi超压保护开关,关闭BAR中的电磁活门
Relays in the ACAU control the BAR solenoid valve to close for these conditions:
• Engine start valve not closed (reverse flow protection)
• Engine bleed trip off conditions (490F/254C overheat or 220 psi overpressure protection).


The overheat relay energizes when a bleed trip off condition exists. These conditions cause a bleed trip off:
• 220 psi overpressure switch operation
• 490F (254C) overtemperature switch operation.


The ACAU gets inputs from these controls and sensors:
• The engine fire switch
• Engine bleed switch
• Engine start valve
• The BAR 220 psi overpressure (OVPR) switch
• The 490F (254C) overheat switch (engine strut duct).


There is protection for the pneumatic manifold from overpressure or overtemperature conditions. Operation of either the 220 psi overpressure switch or the 490F (254C) overheat switch will cause a bleed trip off condition. A bleed trip off condition sends a signal from the ACAU to close the BAR solenoid valve regardless of bleed switch position.


36-13-00 地面接头单向活门

(8)地面供应气源的压力限制为60 psi
Training Information Point
This connector connects directly into the pneumatic manifold and supplies no temperature or pressure regulation. The external pneumatic source must control temperature and pressure within these placard limits on the connector door:
• Maximum temperature 450F (232C)
• Maximum pressure 60 psi.


36-20-00 双管道压力指示器

(9)管道压力表的指示范围是0-80 psi
Physical Description
The pressure indicator has two independent needles (L and R), and a single scale (0-80 psi). Integral lamps light the indicator scale. The indicator has a single electrical connector.




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发表于 2019-8-13 14:22:15 | 显示全部楼层
空调工作最低引气压力多少?
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 楼主| 发表于 2019-8-14 08:58:47 | 显示全部楼层
zxliu2007 发表于 2019-8-13 14:22
空调工作最低引气压力多少?

真是个新鲜话题,很可能要看空调组件的FCSOV了,它的电控气动的,电控信号来自驾驶舱电门。气动多少压力可以推动这个活门了。据一朋友查了CMM说FCSOV的工作压力范围是10-50PSI,那就是说10PSI可以推动活门

当然实际情况中,引气压力也很少有这么低的
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