773289HPC（HIGH PRESSURE CONTROLLER）-张群记事

HPC（HIGH PRESSURE CONTROLLER）高压控制器

一、名称

HPC（HIGH PRESSURE CONTROLLER）

高压控制器

二、件号

773289 series

三、章节号

36-12-02

四、适用机型

B747/B767

五、系统

36-PNEUMATIC

气源

六、安装位置

411 Left Powerplant Engine；421 Right Powerplant Engine

发动机齿轮箱

图片[1]-773289HPC（HIGH PRESSURE CONTROLLER）-张群记事

图片[2]-773289HPC（HIGH PRESSURE CONTROLLER）-张群记事

七、部件原理

A.Above 27,000 feet an evacuated bellows expands sufficiently to contact the control lever to provide a bias force to reduce switchover pressure linearly from 105 psig at 27,000 feet to 77 psig at 42,000 feet.

在27000英尺以上，真空膜盒膨胀触动控制杆，从而提供偏置力以将转换压力从27000英尺处的105 psig线性降低到42000英尺处的77 psig。

B.The switchover pressure schedule has been selected so that high pressure air is used only when intermediate pressure is insufficient to supply the system flow demands.

只有在中压级压力不足以满足系统流量需求时，转换压力计划被选择来使用高压空气。

C.The restrictions within the control and the orifice in the servo line control the opening rate of the high pressure shutoff valve to minimize downstream pressure transients.

控制器内的限流孔和伺服管路中的节流孔控制高压关断活门的打开速率，以最小化下游压力瞬变。

D.Orifices in the BITE switches and in the sensing diaphragm supply line limit leakage flow in the event that a switch or diaphragm becomes damaged or ruptures.

在开关或隔膜损坏或破裂的情况下，BITE开关和感应膜片供应管中的孔限制泄漏流量。

E.The control also contains a latching solenoid to allow an override of the pneumatic switching to close the high pressure shutoff valve. Activating the solenoid shuts off the bleed supply and vents the actuator servo piston of the high pressure shutoff valve to ambient thus closing the valve. In the event of electrical power loss, the solenoid remains in the same position it was in at the time of the power loss.

控制装置还包含一个自锁电磁阀，以允许超控气动开关，从而关闭高压关断活门。电磁阀通电会关闭引气供应，并将高压关断活门的作动器伺服活塞排放到环境中，从而关闭活门。如果断电，电磁阀将保持在断电时的位置。

F.The mechanically operated latching solenoid is replaced with a magnetic latching solenoid. The magnetic latching solenoid has fewer moving parts for more satisfactory operation.

将机械自锁电磁阀更换为磁性自锁电磁阀。磁性自锁电磁阀具有较少的运动部件，以实现更令人满意的操作。

图片[3]-773289HPC（HIGH PRESSURE CONTROLLER）-张群记事

图片[4]-773289HPC（HIGH PRESSURE CONTROLLER）-张群记事

八、工作参数

图片[5]-773289HPC（HIGH PRESSURE CONTROLLER）-张群记事

九、在飞机系统中的工作原理及互联

HPC（773289）供气口连接HP引气，信号口连接HPSOV（802170）的作动器打开腔，当HP引气过高或飞行高度过高或电磁铁通电控制，可使HPSOV关闭。

Simply stated the high pressure controller opens and closes the bleed air high pressure shutoff valve thus providing the required automatic switching between the intermediate and high pressure bleed sources.

简单地说，HPC打开和关闭HPSOV，从而在中压和高压引气源之间自动切换。

High stage bleed pressure acting on the sensing diaphragm is balanced by a reference spring force. Whenever the sensed high stage pressure is below the altitude biased setpoint, the spring force overcomes the diaphragm pressure force allowing high stage pressure to be ported to the opening side of the high pressure shutoff valve actuator.

作用在感应膜片上的高压级引气压力由基准弹簧力平衡。每当感测到的高压级压力低于高度基准设定点时，弹簧力就会克服膜片上的压力，从而允许高压级压力被输送到HPSOV作动器的打开腔。