342B TEMPERATURE CONTROL THERMOSTAT【部件介绍】

温度控制恒温器342B

一、名称

TEMPERATURE CONTROL THERMOSTAT

温度控制恒温器

二、件号

342B040000,342B050000

三、章节号

36-11-47

四、适用机型

A319/A320

五、系统

36 PNEUMATIC

气源

六、安装位置

发动机吊架

 

 

 

 

七、部件原理

Detailed Description Fig FUNC-3

The Temperature Control Thermostat has four parts:

– a pressure reducing valve,

– a regulating stick,

– a filter,

– a thermostat body

详细描述FUNC-3

温度控制恒温器有四个部分:

– 减压阀、

– 调节杆、

– 过滤器、

– 恒温器壳体

Operation

Temperature Control Function Fig FUNC-4

The thermostat pneumatically supplies and controls the servo-chamber of the Fan Air Valve in relation with the temperature measured at the precooler outlet.

Two functions adjust the servopressure in the chamber (A) of the pressure reducer.

When the precooled air temperature is more than or equal to a set value, the regulating probe controls the Fan Air Valve to adjust the fan air flowrate. This function is related to the differential thermal expansion between the stainless steel tube and the Invar rod, which opens the rod valve and releases the pressure in chamber A. This supplies a pressure into the servo-chamber of the Fan Air Valve that changes frequently between clapper and its seat. Because of this, the Fan Air Valve adjusts a cooling airflow in relation to the temperature conditions measured at the precooled air outlet.

操作

温度控制功能Fig FUNC-4

温控器根据在预热器出口测得的温度,对风扇空气活门的伺服腔（打开腔）进行气动供气和控制。

有两种功能用于调节减压阀腔(A)中的伺服压力。

当预热空气温度高于或等于设定值时,调节探针会控制风扇空气活门,以调节风扇空气流量。此功能与不锈钢管和不胀钢杆之间的热膨胀差有关,不胀钢杆打开杆阀并释放A室的压力。这为风扇空气活门的伺服腔提供压力,使其在阀芯和阀座之间频繁切换。因此,风扇空气活门根据预冷空气出口测得的温度条件调节冷却气流。

 

 

 

 

八、工作参数

Technical characteristics

– Supply Pressure:

• 3 bar rel. (Relative) (43.51 psig).

– Maximum Supply Temperature:

• In the event of failure: 260 °C (500 °F).

– Control temperature (thermostat connected with Fan Air Valve):

• Normal value: 185 to 215 °C (365 to 419 °F) within the pressure and temperature ranges.

九、在飞机系统中的工作原理及互联

Downstream of the PRV an overpressure valve (OPV) (5HA) is installed to protect the pneumatic system against damage if overpressure occurs. To keep the temperature within the limits, a fan air valve (FAV) (9HA) is installed in the cooling air duct which supplies fan air to the precooler exchanger .

The FAV operates pneumatically and is connected by a sense line to a fan air valve control thermostat (7170HM). The thermostat is installed downstream of the precooler exchanger.

在PRV 的下游安装有一个超压活门(OPV)(5HA),用以保护气源系统免遭超压的损伤。为了将温度保持在极限内,在冷却空气管道内安装有一个风扇空气活门(FAV)(9HA),该活门提供风扇空气到预冷器交换器。

FAV 由引气操作并通过一根感应管路连接到风扇空气活门温度控制恒温器(7170HM)。FAV 控制恒温器安装在预冷器交换器的下游。

Fan Air Valve Control Thermostat

(1) The fan air valve control thermostat is installed downstream of the bleed air precooler exchanger. It controls, through the fan air valve, the engine fan cooling airflow in order to maintain the bleed air temperature to 200 deg.C (392 deg.F) plus or minus 15 deg.C (27 deg.F).

(2) Detailed Description (Ref. Fig. 030)

The fan air valve control thermostat contains two mains parts:

– A temperature sensing element

– A pressure regulator.

(a) Regulation

When the temperature downstream of the precooler exchanger is below the required value:

– the INVAR rod valve remains on its seat

– no air flows through the pressure regulator

– the FAV remains closed.

When the temperature is over the required value differential expansion between the INVAR rod and the stainless steel sensing tube opens the rod valve causing the venting of the chamber A and thus allowing a pressure signal through the thermostat to the opening chamber of the FAV.

– Between both values the FAV butterfly has an intermediate position.

风扇空气活门控制恒温器

(1) 风扇空气活门控制恒温器安装在引气预冷器交换器的下游。它能够通过风扇空气活门来控制发动机的风扇冷却气流,以将引气温度保持在200 ℃(392℉)±15 ℃(27 ℉)。

(2) 详细说明(参见图 030)

风扇空气活门控制恒温器含有二个主要部件:

– 一个温度传感元件

– 一个压力调节器。

(a) 调节

当预冷器交换器下游温度低于所要求的值时:

– 不胀钢杆阀仍然保持在其底座上

– 没有空气流入调压器

– FAV 保持关闭。

当温度超过所要求的值时,在不胀钢杆和不锈钢感应管之间的差分膨胀的作用下,连杆活门打开,导致腔A放气并使得一个压力信号经过控制恒温器传递到FAV 的打开腔。

– 在两个值之间 FAV 的蝶形板有一个中间位置。

FAV/CONTROL THERMOSTAT

The Fan Air Valve (FAV) pneumatically regulates the fan airflow to the precooler for bleed air temperature regulation at 200°C (392°F). The FAV is pneumatically controlled by an external servo-control: the FAV control thermostat (CTL THERMST), located downstream from the precooler.

风扇空气活门 / 控制恒温器

风扇活门 (FAV) 以气动方式调节进入预冷却器的风扇气流，用于调节 200°C (392°F) 的引气温度。FAV 由位于预冷却器下游的外部伺服控制器气动控制：FAV 控制恒温器 (CTL THERMST)。