Demisting system and method based on cabin internal circulation

Abstract

The invention belongs to the technical field of aircraft environment control, and discloses a demisting system and method based on cabin internal circulation, the system comprises a temperature-humidity sensor, a demisting fan and a demisting system controller, the temperature-humidity sensor is mounted on the inner surface of a transparent part of an aircraft cabin, and the demisting fan is mounted on the inner surface of the transparent part; the wind direction of the demisting fan faces the inner surface of the transparent part of the aircraft cabin, the demisting system controller receives a signal of the temperature-humidity sensor, and the demisting system controller is connected with and controls the demisting fan; under the control of the demisting system controller, the demisting fan is automatically turned on or turned off according to the temperature and humidity collected by the temperature-humidity sensor, and the rotating speed is automatically adapted when the demisting fan is turned on. By the adoption of the demisting system based on cabin internal circulation, the demisting function of the aircraft cabin is achieved, the system is light in weight, demisting control valves, pipelines and other structures are omitted, the system has the advantages of being high in reliability, light in weight, free of maintenance and the like, and due to the fact that engine air entraining is not involved, the aircraft compensation loss is small.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of aircraft environmental control technology, and relates to an aircraft cabin defogging system, in particular to a defogging system and method based on cabin internal circulation. BACKGROUND

[0002] At present, the air circulation system is mainly used in the aircraft environmental control system. After the outside air is introduced to cool the high-temperature and high-pressure bleed air of the engine, the cooled air is supplied to the cabin for temperature adjustment and defogging. Generally, after entering the defogging state, the control system will automatically adjust the cabin air supply flow distribution index, and most of the environmental control air supply will be supplied to the windshield for defogging. However, due to the limitations of engine bleed air flow, engine interface, performance loss and other factors, some aircraft cannot provide sufficient defogging air flow, and the cabin defogging function becomes a design difficulty for the environmental control system of such aircraft. SUMMARY

[0003] In order to solve the above problems, the present application provides a defogging system and method based on cabin internal circulation, which is suitable for aircraft environmental control systems that cannot perform engine bleed air or have less engine bleed air flow.

[0004] The technical scheme of the present application is as follows: A defogging system based on cabin internal circulation, comprising a temperature-humidity sensor, a defogging fan and a defogging system controller, the temperature-humidity sensor is installed on the inner surface of the aircraft cabin transparent part, the defogging fan is directed towards the inner surface of the aircraft cabin transparent part, the defogging system controller receives the signal of the temperature-humidity sensor, and the defogging system controller is connected to and controls the defogging fan; under the control of the defogging system controller, the defogging fan is automatically turned on or off according to the temperature and humidity collected by the temperature-humidity sensor, and automatically adapts the speed when turned on.

[0005] Further, a defogging control switch is further included, the defogging control switch is connected to the defogging system controller, and after the defogging system controller receives the switching signal of the defogging control switch, the defogging fan is controlled to be turned on and in the maximum wind speed state or turned off.

[0006] Further, the installation position and number of the defogging fan are determined according to the flow radiation area of the defogging fan and the area of the inner surface of the aircraft cabin transparent part, to ensure that more than 98% of the area of the inner surface of the aircraft cabin transparent part from the center to the outside is within the flow radiation range of the defogging fan, and the total flow of all defogging fans at the maximum speed is not less than a set value.

[0007] Further, while meeting the cabin internal noise threshold limit of 89dB, the total flow of all defogging fans at the maximum speed is not less than 140kg / h.

[0008] Further, the blowing direction of the defogging fan has an angle of 7-13 degrees with the inner surface of the cockpit transparent member.

[0009] A defogging method based on cockpit circulation, using the aforementioned defogging system based on cockpit circulation, when the temperature collected by the temperature-humidity sensor is equal to the first threshold value, the defogging fan is started, at this time, the defogging fan is in the initial speed state; as the temperature collected by the temperature-humidity sensor decreases, the speed of the defogging fan increases, until the temperature collected by the temperature-humidity sensor is equal to the second threshold value, the defogging fan reaches the maximum speed.

[0010] Further, the first threshold value is 20 DEG C, and the second threshold value is 15 DEG C.

[0011] Further, a defogging method based on cockpit circulation, using the aforementioned defogging system based on cockpit circulation, when the humidity collected by the temperature-humidity sensor is equal to the third threshold value, the defogging fan is started, at this time, the defogging fan is in the initial speed state; as the humidity collected by the temperature-humidity sensor increases, the speed of the defogging fan increases, until the humidity collected by the temperature-humidity sensor is equal to the fourth threshold value, the defogging fan reaches the maximum speed.

[0012] Further, the third threshold value is 60%, and the fourth threshold value is 80%.

[0013] The advantages of the present application are as follows: 1. On the aircraft without bleed air or with low bleed air flow, the present application realizes the defogging function of the cockpit of the aircraft by using the defogging system based on cockpit circulation, and the system has simple structure and light weight, and the defogging control valve, pipeline and other structures are omitted. The present application has the characteristics of high reliability, light weight and maintenance-free, and the loss of the aircraft is small because the present application does not involve engine bleed air.

[0014] 2. The defogging system of the present application is automatically started and stopped, and the opening and closing are determined according to the temperature and humidity, and the speed is adaptively adjusted, so that the noise threshold limit in the cockpit is met while the defogging effect is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0016] Figure 1 The schematic diagram of the defogging system based on cockpit circulation of the present application.

[0017] Wherein, 1 - defogging system controller, 2 - temperature-humidity sensor, 3 - defogging fan, 4 - defogging control switch. DETAILED DESCRIPTION

[0018] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments but not all of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0019] The features and illustrative embodiments of various aspects of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some of these specific details. The description of the embodiments below is merely intended to provide a better understanding of the present application by showing examples of the present application. The present application is in no way limited to any specific settings and methods presented below, but covers any improvements, replacements and modifications of structures, methods and devices without departing from the spirit of the present application. In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessary obscuring the present application.

[0020] In the description of the present application, it should be noted that the directions or positional relationships belonging to "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are described based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as limiting the present application. In addition, the ordinal numbers (for example, "first" and "second", etc.) are used to distinguish objects, and are not limited to the order, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, which can be directly connected or indirectly connected through an intermediate medium. For a person of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0022] It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other, and each embodiment can be mutually referred to and quoted. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0023] Embodiment 1: A kind of defogging system based on cabin circulation, including temperature-humidity sensor 2, defogging fan 3 and defogging system controller 1, temperature-humidity sensor 2 is installed in the inner surface of aircraft cabin transparency, the direction of defogging fan 3 is towards the inner surface of aircraft cabin transparency, defogging system controller 1 receives the signal of temperature-humidity sensor 2, defogging system controller 1 is connected and controls defogging fan 3;Under the control of defogging system controller 1, defogging fan 3 is automatically opened or closed according to the temperature and humidity collected by temperature-humidity sensor 2, and automatically adapts speed when opening.

[0024] Also include defogging control switch 4, defogging control switch 4 connects defogging system controller 1, after defogging system controller 1 receives the switching signal of defogging control switch 4, control defogging fan 3 opens and is in maximum wind speed state or is closed.

[0025] The installation position and quantity of defogging fan 3 are determined according to the flow radiation area of defogging fan 3 and the area of the inner surface of aircraft cabin transparency, to ensure that more than 98% of the area of the inner surface of aircraft cabin transparency from the center to the outside is within the flow radiation range of defogging fan 3, and the total flow of all defogging fans 3 under maximum speed is not less than a set value.

[0026] While meeting the cabin noise threshold limit of 89dB, the total flow of all defogging fans 3 under maximum speed is not less than 140kg / h.

[0027] The blowing direction of defogging fan 3 has an angle of 7°-13° with the inner surface of aircraft cabin transparency.

[0028] A defogging method based on cabin circulation, using the aforementioned defogging system based on cabin circulation, when the temperature collected by temperature-humidity sensor 2 is equal to the first threshold value, defogging fan 3 is opened, at this time defogging fan 3 is in initial speed state;With the decrease of the temperature collected by temperature-humidity sensor 2, the speed of defogging fan 3 rises, until the temperature collected by temperature-humidity sensor 2 is equal to the second threshold value, defogging fan 3 reaches maximum speed.

[0029] The first threshold value is 20℃, and the second threshold value is 15℃.

[0030] A defogging method based on cabin circulation, using the aforementioned defogging system based on cabin circulation, when the humidity collected by temperature-humidity sensor 2 is equal to the third threshold value, defogging fan 3 is opened, at this time defogging fan 3 is in initial speed state;With the increase of the humidity collected by temperature-humidity sensor 2, the speed of defogging fan 3 rises, until the humidity collected by temperature-humidity sensor 2 is equal to the fourth threshold value, defogging fan 3 reaches maximum speed.

[0031] The third threshold value is 60%, and the fourth threshold value is 80%.

[0032] Embodiment 2 The fog removal system based on cabin internal circulation comprises a temperature-humidity sensor of an inner surface of a cabin transparent part, a fog removal control switch, a fog removal system controller and a fog removal fan.

[0033] The temperature-humidity sensor of the inner surface of the cabin transparent part serves as an input signal of the fog removal system control, collects the temperature and humidity of the windshield area in real time, and provides a flow control reference for the fog removal system controller. The fog removal control switch comprises two position control outputs, namely, an automatic control and a manual control, and outputs an automatic control signal or a manual control signal to the fog removal system controller in the respective corresponding positions. The fog removal system controller controls the fan speed according to the signals of the temperature-humidity sensor of the inner surface of the cabin transparent part and the fog removal control switch, and realizes the fog removal flow adjustment based on cabin internal circulation. The fog removal fan is a fan with adjustable speed.

[0034] The working principle is as follows: When the fog removal control switch is placed in the automatic position, the fog removal system controller automatically adjusts the fan speed according to the signals of the temperature-humidity sensor of the inner surface of the cabin transparent part. When the temperature of the inner surface of the cabin transparent part exceeds the set value, the controller controls the fan to be in a low speed state, so as to ensure that the windshield has a certain anti-fog function. When the fog removal control switch is placed in the manual position, the fog removal system controller controls the fan to run at the maximum speed state. As shown in Figure 1 The fog removal system based on cabin internal circulation comprises a fog removal system controller 1, a temperature sensor 2 of an inner surface of a cabin transparent part, a fog removal fan 3 and a fog removal control switch 4.

[0035] When the defogger control switch 4 is in the automatic position, the defogger system controller 1 automatically adjusts the speed of the defogger fan 3 based on the signal from the temperature and humidity sensor 2 on the inner surface of the cabin transparent part. When the temperature of the inner surface of the cabin transparent part reaches the threshold of 20°C, the defogger system controller 1 controls the defogger fan 3 to operate at a low speed to ensure that the windshield has a certain anti-fog function. When the temperature of the inner surface of the cabin transparent part is lower than the threshold of 20°C, the defogger system controller 1 adjusts the speed of the defogger fan 3 in real time based on the difference between the inner surface temperature and the set value. The greater the temperature difference, the higher the fan speed. The fan operates at its maximum speed when the temperature of the transparent part is 15°C. Considering the different dimensions of the fans, the fan speed setting is based on the cabin noise threshold and fan flow rate as the core control indicators. While meeting the cabin noise threshold limit of 89dB, the defogger flow rate should be no less than 140kg / h at the maximum speed, and fogging in the transparent area can generally be removed within 15 seconds. The position and number of fans can be adjusted as needed to ensure the total flow rate, while ensuring that the fan air supply direction has a certain angle of 7° to 13° with the surface of the transparent part. Since cold air and high-humidity air are denser, and to ensure that the sensor placement does not obstruct the pilot's view, the temperature-humidity sensor should be placed preferably in the lower edge of the main field of view area of ​​the transparent part.

[0036] When the defogging control switch 4 is in the manual position, the defogging system controller 1 controls the defogging fan 3 to run at maximum speed.

[0037] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A defogging system based on cabin internal circulation, characterized in that, The system comprises a temperature-humidity sensor (2), a defogging fan (3) and a defogging system controller (1), the temperature-humidity sensor (2) is installed on the inner surface of the cockpit transparency, the defogging fan (3) is directed towards the inner surface of the cockpit transparency, the defogging system controller (1) receives the signal of the temperature-humidity sensor (2), and the defogging system controller (1) is connected to and controls the defogging fan (3); under the control of the defogging system controller (1), the defogging fan (3) is automatically turned on or off according to the temperature and humidity collected by the temperature-humidity sensor (2), and the speed is automatically adjusted when it is turned on.

2. A defogging system based on cabin air recirculation according to claim 1, characterized in that, The system further comprises a defogging control switch (4), the defogging control switch (4) is connected to the defogging system controller (1), and the defogging system controller (1) controls the defogging fan (3) to be turned on and in the maximum speed state or turned off after receiving the switching signal of the defogging control switch (4).

3. A defogging system based on cabin air recirculation according to claim 1, characterized in that, The installation position and number of the defogging fan (3) are determined according to the flow radiation area of the defogging fan (3) and the area of the inner surface of the cockpit transparency, so as to ensure that more than 98% of the area of the inner surface of the cockpit transparency from the center to the outside is within the flow radiation range of the defogging fan (3), and the total flow of all defogging fans (3) at the maximum speed is not less than a set value.

4. A defogging system based on cabin air recirculation according to claim 3, characterized in that, While meeting the threshold limit of 89 dB of the noise in the cockpit, the total flow of all defogging fans (3) at the maximum speed is not less than 140 kg / h.

5. A system for de-fogging based on cabin air recirculation as claimed in claim 1, wherein, The blowing direction of the defogging fan (3) has an angle of 7°-13° with the inner surface of the cockpit transparency.

6. A method of defogging based on cabin air circulation using a system for defogging based on cabin air circulation as claimed in claim 1, characterized in that, When the temperature collected by the temperature-humidity sensor (2) is equal to the first threshold value, the defogging fan (3) is turned on, and at this time, the defogging fan (3) is in the initial speed state; as the temperature collected by the temperature-humidity sensor (2) decreases, the speed of the defogging fan (3) increases, until the temperature collected by the temperature-humidity sensor (2) is equal to the second threshold value, the defogging fan (3) reaches the maximum speed.

7. A method of demisting based on cabin air recirculation according to claim 6, characterized in that, The first threshold value is 20℃, and the second threshold value is 15℃.

8. A method of defogging based on cabin air circulation using a system for defogging based on cabin air circulation as claimed in claim 1, characterized in that, A defogging method based on the circulation in the cockpit, using the aforementioned defogging system based on the circulation in the cockpit, when the humidity collected by the temperature-humidity sensor (2) is equal to the third threshold value, the defogging fan (3) is turned on, and at this time, the defogging fan (3) is in the initial speed state; as the humidity collected by the temperature-humidity sensor (2) increases, the speed of the defogging fan (3) increases, until the humidity collected by the temperature-humidity sensor (2) is equal to the fourth threshold value, the defogging fan (3) reaches the maximum speed.

9. A method of demisting based on cabin air recirculation according to claim 8, characterized in that, The third threshold value is 60%, and the fourth threshold value is 80%.

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