2790583 COWL ANTI-ICE 3 1/2 INCH CONTROL VALVE ASSEMBLY

3-1/2英寸防冰控制活门组件

一、名称

COWL ANTI-ICE 3 1/2 INCH CONTROL VALVE ASSEMBLY

3-1/2英寸防冰控制活门组件

二、件号

2790583-104~-108,-105C,S312T001-4,-6,-7,-8

三、章节号

30-20-01

四、适用机型

B747/757/767

五、系统

30 ICE AND RAIN PROTECTION

防冰防雨

六、安装位置

发动机

 

 

七、部件原理

A. Engine Inlet Thermal Anti-Ice (TAI) Valves

(1) The engine inlet TAI valve controls the flow of engine bleed air into the TAI ducts. One valve is on the top part of each engine.The valve is electrically controlled, pneumatically operated, and is set to keep duct air pressure between 20-28 psi.

(2) An indicator on the valve shows if the valve vane is CLOSED or NOT CLOSED. A person can manually operate the valve and lock it at the fully open or fully closed position.

(3) When the TAI valve solenoid is energized, it opens an upstream air passage to the actuator diaphragm. Upstream air pressure becomes more than the forces of the return spring and the closing diaphragm.The actuator diaphragm opens the valve vane.

(4) When the TAI valve solenoid is not energized, it closes the upstream air passage to the actuator diaphragm. The actuator diaphragm is opened to ambient air. Upstream air pressure on the closing diaphragm and the return spring close the valve vane. Upstream air pressure keeps the valve vane in the closed position.

(5) The pilot pressure regulator gets input from the downstream (regulated) pressure. If downstream pressure is more than the adjustment setting of the pilot regulator, a valve bleeds off the actuator diaphragm pressure. The closing diaphragm and return spring partially close the valve vane.

A. 发动机进气道防冰活门

(1) 发动机进气道防冰活门控制发动机引气进入防冰管道。每个发动机顶部都有一个活门。该活门采用电控气动操作，可保持管道气压在20-28 psi之间。

(2) 活门上的指示器显示活门板是CLOSED还是NOT CLOSED。操作员可以手动操作活门，并将其锁定在全开或全闭位置。

(3) 当TAI电磁阀通电时，它将打开通往作动器膜片的上游空气通道。上游空气压力大于回位弹簧和关闭膜片的作用力。作动器膜片打开活门板。

(4) 当TAI阀电磁阀未通电时，它将关闭通往作动器膜片的上游空气通道。作动器膜片打开，连通环境空气。关闭膜片上的上游空气压力和回位弹簧将活门板关闭。上游空气压力使活门板保持在关闭位置。

(5) 先导压力调节器从下游（调节）压力获得输入。如果下游压力超过先导调节器的调节设置，则先导阀会从作动器膜片压力中放气。关闭膜片和复位弹簧会部分关闭活门板。

 

1. Description

A. The Cowl Anti-Ice 3 1/2 Inch Control Valve Assembly is an electrically controlled, pneumatically operated valve that controls the hot air directed to the engine cowl. The valve assembly consists of a body, vane, and switch assembly; solenoid assembly; housing assembly; pilot housing assembly; a cylinder assembly; and diaphragm assembly.

B. The body, vane, and switch assembly connects in the hot air duct. The body assembly encloses the vane, the upstream control air port, and provides mounting pads for the switch assembly and the housing assembly. The switch assembly provides electrical vane position signals to the connector mounted in the housing assembly.

C. The housing assembly is mounted on the body assembly and contains the solenoid, pilot housing assembly, and the cylinder and diaphragm assembly. The housing assembly also contains the air ports and internal air and wiring passages.

D. The cylinder and diaphragm are connected to the vane by a shaft and linkage. The diaphragm is moved by upstream air pressure and a spring.

E. The pilot housing assembly compares downstream air pressure with preset condition for regulation.

F. The solenoid assembly is 28 VDC continuous duty and is connected to the connector by wiring.

2. Operation

A. The Cowl Anti-Ice 3 1/2 Inch Control Valve Assembly is normally closed. It is held closed by a spring acting against the diaphragm and by upstream control air. The control air is also vented through a fixed orifice to atmosphere.

B. When the solenoid is energized, it closes the control air venting directing the control air to the diaphragm. The control air acting against the diaphragm overcomes spring load and moves the diaphragm which opens the vane. The control valve is now in a regulating mode.

C. The pilot housing assembly compares downstream air pressure with a preset value. When the downstream air pressure exceeds the preset value, a poppet opens venting the control air to atmosphere. The spring loaded diaphragm closes the vane. When the downstream air pressure is reduced below the preset value, the poppet closes which allows the upstream control air to again move the diaphragm and open vane. The switch assembly indicates whether the vane is “CLOSED” or “NOT CLOSED.”

D. The control valve can be manually operated and locked to the fully open of fully closed position.

1. 描述

A. 发动机罩防冰3 1/2英寸控制活门组件是一种电控气动活门，用于控制流向发动机罩的热空气。该活门组件由壳体、活门板和开关组件、电磁阀组件、外壳组件、先导外壳组件、气缸组件和膜片组件组成。

B. 壳体、活门板和开关组件连接在热风管道上。壳体组件包含活门板、上游控制空气端口，并为开关组件和壳体组件提供安装垫。开关组件为安装在壳体组件中的连接器提供活门板位置电信号。

C. 壳体组件安装在壳体组件上，包含电磁阀、先导壳体组件以及气缸和膜片组件。壳体组件还包含空气端口以及内部空气和布线通道。

D. 气缸和膜片通过轴和连杆与活门板相连。膜片由上游空气压力和弹簧驱动。

E. 先导壳体组件将下游空气压力与预设条件进行比较，以进行调节。

F. 电磁阀组件的持续工作电压为28伏直流电，通过电线与连接器相连。

2. 操作

A. 整流罩防冰3 1/2英寸控制活门组件为常闭状态。它通过一个作用于膜片的弹簧和上游控制空气保持关闭。控制空气还通过一个固定孔口排放到大气中。

B. 当电磁线圈通电时，它关闭控制空气通风口，将控制空气引导至膜片。作用于膜片上的控制空气克服弹簧载荷，推动膜片，从而打开活门板。控制阀此时处于调节模式。

C. 先导阀组件将下游空气压力与预设值进行比较。当下游空气压力超过预设值时，提升阀打开，将控制空气排放到大气中。弹簧载荷膜片关闭活门板。当下游气压降低到预设值以下时，提升阀关闭，上游控制空气再次推动膜片并打开活门板。开关组件指示活门板是“CLOSED”还是“NOT CLOSED”。

D. 控制活门可以手动操作，并锁定在全开或全闭位置。

 

八、工作参数

 

九、在飞机系统中的工作原理及互联

A. Engine bleed air removes ice from the engine inlets. The system has these components:

(1) Engine inlet thermal (TAI) anti-ice valves

(2) Pressure switches

(3) Engine inlet thermal anti-ice ducts

(4) Engine inlet thermal anti-ice overheat temperature switches

(5) Wing and engine anti-ice control panel.

B. System electrical power is from the left and right main DC buses, through circuit breakers found on the overhead circuit breaker panel, P11.

C. System electrical power is usually from the 28v dc standby bus, and the right main bus, through circuit breakers found on the overhead circuit breaker panel, P11. If no power is available on the right main bus, system electrical power will come from the 28v dc battery bus.

D. The use of the thermal anti-ice system for the wing or the engine cowl will change the engine pressure ratio (EPR). The two EPR values will decrease if the left or the right engine air is used by the anti-ice system (PW: PAGEBLOCK 77-12-00/001).

A. 发动机引气系统用于清除发动机进气口的冰。该系统包括以下组件：

(1) 发动机进气口热（TAI）防冰活门

(2) 压力开关

(3) 发动机进气口热防冰导管

(4) 发动机进气口热防冰过热温度开关

(5) 机翼和发动机防冰控制面板。

B. 系统电力来自左右主直流汇流条，通过头顶断路器面板P11上的断路器。

C. 系统电力通常来自28伏直流备用汇流条和右侧主汇流条，通过头顶断路器面板P11上的断路器。如果右侧主汇流条没有电力，系统电力将来自28伏直流电瓶汇流条。

D. 机翼或发动机罩的热防冰系统的使用将改变发动机压力比（EPR）。如果防冰系统使用左侧或右侧发动机空气，则两个EPR值将降低（PW：PAGEBLOCK 77-12-00/001）。

A. Functional Description

(1) When you put an ENGINE ANTI ICE switch to the on position the amber VALVE light for that engine comes on. Two seconds later, the cowl TAI valve control time delay (T/D) relay closes and the TAI valve opens. The amber VALVE light goes off after the valve opens.

(2) The amber VALVE light below the switch comes on when the valve’s position disagrees with its commanded position. The EICAS display shows a ENG ANTI-ICE message.

(3) If the duct pressure is more than 30 psi, the pressure switch closes, and the EICAS display shows the message, ENG TAI VALVE.

(4) If the temperature in an engine compartment is more than 250 degrees F the engine inlet TAI overheat temperature switch opens. The engine inlet TAI valve closes. The EICAS display shows the messages, L(R) COWL DUCT LEAK and L(R) ENG TAI VALVE. The amber VALVE light comes on.

A. 功能描述

(1) 当您将发动机防冰开关置于开启位置时，该发动机的琥珀色活门指示灯亮起。两秒后，整流罩TAI活门控制延时（T/D）继电器关闭，TAI活门打开。活门打开后，琥珀色活门指示灯熄灭。

(2) 当活门的位置与其指令位置不一致时，开关下方的琥珀色“活门”指示灯亮起。EICAS显示屏显示ENG ANTI-ICE（防冰）信息。

(3) 如果管道压力超过30 psi，压力开关关闭，EICAS显示屏显示ENG TAI VALVE（TAI活门）信息。

(4) 如果发动机舱内的温度超过250华氏度，发动机进气道TAI过热温度开关将打开。发动机进气道TAI活门关闭。EICAS显示屏将显示信息L(R) COWL DUCT LEAK和L(R) ENG TAI VALVE。琥珀色的活门指示灯亮起。

Engine Inlet Thermal Anti-Icing (SUBJECT 30-21-00)

(a) The engine inlet TAI system uses engine bleed air to prevent ice on the engine inlets. The system components include the engine inlet TAI valves, engine inlet TAI pressure switches, engine inlet TAI ducts, and wing and engine anti-ice control panel.

发动机进气口防冰系统

(a) 发动机进气口TAI系统利用发动机引气防止发动机进气口结冰。系统组件包括发动机进气口TAI活门、发动机进气口TAI压力开关、发动机进气口TAI导管以及机翼和发动机防冰控制面板。