Air circulation system based on skin heat exchange and control method thereof

Abstract

The application belongs to the technical field of aircraft thermal management, and particularly relates to an air circulation system based on skin heat exchange and a control method thereof. The air circulation system comprises: a skin temperature detection unit arranged on a skin; a temperature control cabin and a power unit arranged on a circulation main line, wherein a cabin environment temperature detection unit is arranged in the temperature control cabin; a skin heat exchange control branch and a first regulating valve are arranged in series on a first circulation branch; a heating unit and a second regulating valve are arranged in series on a second circulation branch; and a control unit is used for controlling the start-stop and rotating speed of the power unit, the start-stop and heating power of the heating unit, and the opening degree of the regulating valve according to temperature signals of the skin temperature detection unit and the cabin environment temperature detection unit. The application takes the external environment as a cold source, meets the temperature control requirement of the cabin environment, has a simple structure, low cost and convenient control.

Description

Technical Field

[0001] This application belongs to the field of aircraft thermal management technology, and specifically relates to an air circulation system based on skin heat exchange and its control method. Background Technology

[0002] During flight, the cabin temperature may need to be regulated. The onboard air circulation system is an indispensable and important system in modern aircraft, used to regulate the environmental conditions inside the cabin.

[0003] Existing air circulation systems suffer from problems such as complex structure, high cost, and complex control.

[0004] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Summary of the Invention

[0005] The purpose of this application is to provide an air circulation system based on skin heat exchange and its control method to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] The first aspect of this application provides an air circulation system based on skin heat exchange, comprising:

[0008] The skin is equipped with a skin temperature detection unit.

[0009] The ventilation duct includes a main circulation path, a first circulation branch path, and a second circulation branch path. The first circulation branch path and the second circulation branch path are connected in parallel and then connected in series with the main circulation path.

[0010] A temperature-controlled chamber and a power unit are provided on the main circulation route. The temperature-controlled chamber is equipped with a chamber environment temperature detection unit.

[0011] The first circulation branch is connected in series with a skin heat exchange control branch and a first regulating valve. The skin heat exchange control branch includes a skin heat exchange branch and a heat exchange control branch connected in parallel. The skin heat exchange branch is provided with a skin heat exchange unit connected to the skin. The heat exchange control branch is provided with a regulating valve.

[0012] A heating unit and a second regulating valve are connected in series on the second circulation branch;

[0013] The control unit is connected to the skin temperature detection unit, the cabin ambient temperature detection unit, the power unit, the heating unit, the first regulating valve, the second regulating valve, and the regulating valve on the heat exchange control branch, respectively. It is used to control the start / stop and speed of the power unit, the start / stop and heating power of the heating unit, and the opening degree of the first regulating valve, the second regulating valve, and the regulating valve on the heat exchange control branch, based on the temperature signals from the skin temperature detection unit and the cabin ambient temperature detection unit.

[0014] In at least one embodiment of this application, the skin heat exchange unit is tightly fitted and connected to the skin.

[0015] In at least one embodiment of this application, the skin heat exchange unit replaces the skin at the corresponding position and together with the skin at the other positions, forms the shape of the aircraft.

[0016] In at least one embodiment of this application, at least two of the skin heat exchange control branches are connected in series.

[0017] In at least one embodiment of this application, two skin heat exchange control branches are connected in series, wherein,

[0018] The first skin heat exchange control branch includes a first skin heat exchange branch and a first heat exchange control branch arranged in parallel. A first skin heat exchange unit connected to the skin is provided on the first skin heat exchange branch, and a third regulating valve is provided on the first heat exchange control branch.

[0019] The second skin heat exchange control branch includes a second skin heat exchange branch and a second heat exchange control branch arranged in parallel. A second skin heat exchange unit connected to the skin is provided on the second skin heat exchange branch, and a fourth regulating valve is provided on the second heat exchange control branch.

[0020] A second aspect of this application provides a control method for an air circulation system based on skin heat exchange. Based on the air circulation system based on skin heat exchange as described above, the control method includes:

[0021] The control unit compares the first temperature signal fed back by the cabin ambient temperature detection unit with a set first temperature threshold, and the second temperature signal fed back by the skin temperature detection unit with a set second temperature threshold:

[0022] When the first temperature signal is higher than the first temperature threshold and the second temperature signal is lower than the second temperature threshold, the control unit controls the skin heat exchange unit to cool down the temperature-controlled chamber.

[0023] When the first temperature signal is higher than the first temperature threshold and the second temperature signal is higher than the second temperature threshold, the control unit outputs an alarm signal.

[0024] When the first temperature signal is lower than the first temperature threshold and the second temperature signal is higher than the second temperature threshold, the control unit controls the skin heat exchange unit to raise the temperature of the temperature control chamber.

[0025] When the first temperature signal is lower than the first temperature threshold and the second temperature signal is lower than the second temperature threshold, the control unit controls the heating unit to raise the temperature of the temperature-controlled chamber.

[0026] In at least one embodiment of this application, the control unit controls the skin heat exchange unit to cool the temperature-controlled chamber, including:

[0027] In the first stage: the control unit controls the first regulating valve to open, the second regulating valve to close, the third regulating valve to close, the fourth regulating valve to open, and the power unit to start. Driven by the power unit, the air in the temperature control chamber enters the first skin heat exchange unit for heat dissipation through the main circulation path and the first circulation branch path, and then returns to the temperature control chamber.

[0028] In the second stage: the control unit controls the fourth regulating valve to close, and the air in the temperature control chamber, driven by the power unit, enters the first skin heat exchange unit and the second skin heat exchange unit through the main circulation path and the first circulation branch path to dissipate heat, and then returns to the temperature control chamber;

[0029] In the third stage: the control unit controls the power unit to increase the speed.

[0030] In at least one embodiment of this application, the control unit controls the skin heat exchange unit to raise the temperature of the temperature-controlled chamber, including:

[0031] In the first stage: the control unit controls the first regulating valve to open, the second regulating valve to close, the third regulating valve to close, the fourth regulating valve to open, and the power unit to start. Driven by the power unit, the air in the temperature control chamber enters the first skin heat exchange unit for heating through the main circulation path and the first circulation branch path, and then returns to the temperature control chamber.

[0032] In the second stage: the control unit controls the fourth regulating valve to close, and the air in the temperature control chamber, driven by the power unit, enters the first skin heat exchange unit and the second skin heat exchange unit through the main circulation path and the first circulation branch path for heating, and then returns to the temperature control chamber;

[0033] In the third stage: the control unit controls the power unit to increase the speed.

[0034] In at least one embodiment of this application, the control unit controls the heating unit to raise the temperature of the temperature-controlled chamber, including:

[0035] In the first stage: the control unit controls the first regulating valve to close, the second regulating valve to open, the power unit to start, the heating unit to start and operate at the initial heating power, and the air in the temperature control chamber enters the heating unit for heating through the main circulation path and the second circulation branch path under the drive of the power unit, and then returns to the temperature control chamber;

[0036] In the second stage: the control unit controls the heating unit to increase the heating power.

[0037] The invention has at least the following beneficial technical effects:

[0038] The air circulation system based on skin heat exchange proposed in this application uses the external environment as a cold source to meet the temperature control requirements of the cabin environment. It has a simple structure, low cost, and convenient control. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of an air circulation system based on skin heat exchange according to one embodiment of this application.

[0040] in:

[0041] 1-Skin; 21-First skin heat exchange unit; 22-Second skin heat exchange unit; 3-Temperature-controlled compartment; 4-Power unit; 51-Compartment ambient temperature detection unit; 52-Skin temperature detection unit; 6-Ventilation duct; 7-Control unit; 8-Heating unit; 91-First regulating valve; 92-Second regulating valve; 93-Third regulating valve; 94-Fourth regulating valve. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0044] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0045] The first aspect of this application provides an air circulation system based on skin heat exchange, including: skin 1, skin heat exchange unit, temperature control chamber 3, power unit 4, chamber ambient temperature detection unit 51, skin temperature detection unit 52, ventilation duct 6, control unit 7, heating unit 8, and regulating valves, etc.

[0046] Specifically, such as Figure 1 As shown, a skin temperature detection unit 52 is provided on the skin 1, which is used to detect the temperature of the skin 1. The ventilation duct 6 connects the skin heat exchange unit, the temperature control chamber 3, the power unit 4, and the heating unit 8. The ventilation duct 6 includes a main circulation path, a first circulation branch path, and a second circulation branch path. The first circulation branch path and the second circulation branch path are connected in parallel and then connected in series with the main circulation path. The temperature control chamber 3 and the power unit 4 are provided on the main circulation path. The temperature control chamber 3 is provided with a chamber ambient temperature detection unit 51, which is used to detect the ambient temperature inside the temperature control chamber 3. The power unit 4 can be a circulating fan, which can provide power for airflow, so that the air in the temperature control chamber 3 flows out and exchanges heat in the skin heat exchange unit or heating unit 8, and then is sent back into the temperature control chamber 3 to achieve temperature regulation; the first circulation branch is equipped with a skin heat exchange control branch and a first regulating valve 91 connected in series. The skin heat exchange control branch includes a skin heat exchange branch and a heat exchange control branch connected in parallel. The skin heat exchange branch is equipped with a skin heat exchange unit connected to the skin 1, and the heat exchange control branch is equipped with a regulating valve; the second circulation branch is equipped with a heating unit 8 and a second regulating valve 92 connected in series. The control unit 7 is connected to the skin temperature detection unit 52, the cabin ambient temperature detection unit 51, the power unit 4, the heating unit 8, the first regulating valve 91, the second regulating valve 92, and the regulating valves on the heat exchange control branch, respectively. It is used to control the start and stop and speed of the power unit 4, control the start and stop and heating power of the heating unit 8, and control the opening degree of the first regulating valve 91, the second regulating valve 92, and the regulating valves on the heat exchange control branch according to the temperature signals of the skin temperature detection unit 52 and the cabin ambient temperature detection unit 51.

[0047] In a preferred embodiment of this application, the skin heat exchange unit can be designed to fit tightly against the skin 1, or the contact surface between the skin heat exchange unit and the skin 1 can be designed to directly replace the skin 1 at the location, and together with the skin 1 at other locations, form the shape of the aircraft.

[0048] It is understood that in this embodiment, at least two skin heat exchange control branches are connected in series. In one embodiment of this application, two skin heat exchange control branches are connected in series, wherein the first skin heat exchange control branch includes a first skin heat exchange branch and a first heat exchange control branch connected in parallel, a first skin heat exchange unit 21 connected to the skin 1 is provided on the first skin heat exchange branch, and a third regulating valve 93 is provided on the first heat exchange control branch; the second skin heat exchange control branch includes a second skin heat exchange branch and a second heat exchange control branch connected in parallel, a second skin heat exchange unit 22 connected to the skin 1 is provided on the second skin heat exchange branch, and a fourth regulating valve 94 is provided on the second heat exchange control branch. In this embodiment, the first skin heat exchange unit 21 and the second skin heat exchange unit 22 are arranged side by side on the skin 1. The air circulation system of this application is not limited to two skin heat exchange control branches, but can have three or more skin heat exchange control branches.

[0049] Based on the aforementioned air circulation system based on skin heat exchange, a second aspect of this application provides a control method for an air circulation system based on skin heat exchange, the control method comprising:

[0050] The control unit 7 compares the first temperature signal fed back by the cabin ambient temperature detection unit 51 with a set first temperature threshold, and the second temperature signal fed back by the skin temperature detection unit 52 with a set second temperature threshold.

[0051] When the first temperature signal is higher than the first temperature threshold and the second temperature signal is lower than the second temperature threshold, the control unit 7 controls the skin heat exchange unit to cool down the temperature control chamber 3.

[0052] When the first temperature signal is higher than the first temperature threshold and the second temperature signal is higher than the second temperature threshold, the control unit 7 outputs an alarm signal.

[0053] When the first temperature signal is lower than the first temperature threshold and the second temperature signal is higher than the second temperature threshold, the control unit 7 controls the skin heat exchange unit to raise the temperature of the temperature control chamber 3.

[0054] When the first temperature signal is lower than the first temperature threshold and the second temperature signal is lower than the second temperature threshold, the control unit 7 controls the heating unit 8 to raise the temperature of the temperature-controlled chamber 3.

[0055] The air circulation system control method based on skin heat exchange in this application can be divided into four cases based on the comparison results of the temperature inside the temperature control chamber 3, the temperature of the skin 1, and the set corresponding temperature threshold.

[0056] a. When the first temperature signal is higher than the first temperature threshold and the second temperature signal is lower than the second temperature threshold, the control unit 7 controls the skin heat exchange unit to cool the temperature-controlled chamber 3, specifically including:

[0057] In the first stage: the control unit 7 controls the first regulating valve 91 to open, the second regulating valve 92 to close, the third regulating valve 93 to close, the fourth regulating valve 94 to open, and the power unit 4 to start. Driven by the power unit 4, the air in the temperature control chamber 3 enters the first skin heat exchange unit 21 for heat dissipation through the main circulation path and the first circulation branch path, and then returns to the temperature control chamber 3.

[0058] If the cooling requirements of the temperature-controlled chamber 3 cannot be met by the first skin heat exchange unit 21 alone, the process will proceed to the second stage.

[0059] In the second stage: the control unit 7 controls the fourth regulating valve 94 to close, and the air in the temperature control chamber 3, driven by the power unit 4, enters the first skin heat exchange unit 21 and the second skin heat exchange unit 22 through the main circulation path and the first circulation branch path to dissipate heat, and then returns to the temperature control chamber 3.

[0060] If the cooling requirements of the temperature-controlled chamber 3 cannot be met by the first skin heat exchange unit 21 and the second skin heat exchange unit 22 alone, the process will proceed to the third stage.

[0061] In the third stage: Control unit 7 controls power unit 4 to increase speed.

[0062] b. When the first temperature signal is higher than the first temperature threshold and the second temperature signal is higher than the second temperature threshold, the control unit 7 outputs an alarm signal, indicating that the cooling has failed and the power unit 4 stops operating.

[0063] c. When the first temperature signal is lower than the first temperature threshold and the second temperature signal is higher than the second temperature threshold, the control unit 7 controls the skin heat exchange unit to raise the temperature of the temperature-controlled chamber 3, specifically including:

[0064] In the first stage: the control unit 7 controls the first regulating valve 91 to open, the second regulating valve 92 to close, the third regulating valve 93 to close, the fourth regulating valve 94 to open, and the power unit 4 to start. Driven by the power unit 4, the air in the temperature control chamber 3 enters the first skin heat exchange unit 21 through the main circulation path and the first circulation branch path for heating, and then returns to the temperature control chamber 3.

[0065] If the temperature rise requirement of the temperature-controlled chamber 3 cannot be met by the first skin heat exchange unit 21 alone, the process proceeds to the second stage.

[0066] In the second stage: the control unit 7 controls the fourth regulating valve 94 to close, and the air in the temperature control chamber 3, driven by the power unit 4, enters the first skin heat exchange unit 21 and the second skin heat exchange unit 22 through the main circulation path and the first circulation branch path for heating, and then returns to the temperature control chamber 3;

[0067] If the heating requirements of the temperature-controlled chamber 3 cannot be met by the first skin heat exchange unit 21 and the second skin heat exchange unit 22 alone, the process will proceed to the third stage.

[0068] In the third stage: Control unit 7 controls power unit 4 to increase speed.

[0069] d. When the first temperature signal is lower than the first temperature threshold and the second temperature signal is lower than the second temperature threshold, the control unit 7 controls the heating unit 8 to raise the temperature of the temperature-controlled chamber 3, specifically including:

[0070] In the first stage: the control unit 7 controls the first regulating valve 91 to close, the second regulating valve 92 to open, the power unit 4 to start, the heating unit 8 to start and operate at the initial heating power, and the air in the temperature control chamber 3, driven by the power unit 4, enters the heating unit 8 through the main circulation path and the second circulation branch path for heating, and then returns to the temperature control chamber 3;

[0071] If the heating unit 8 cannot meet the temperature rise requirements of the temperature-controlled chamber 3 under the initial heating power, the second stage will begin.

[0072] In the second stage: the control unit 7 controls the heating unit 8 to increase the heating power.

[0073] This application discloses an air circulation system and its control method based on skin heat exchange, which uses the external environment as a cold source to meet the temperature control requirements of the cabin environment. Compared with air conditioning systems based on engine bleed air, this application has a simpler structure and is easier to control; compared with temperature regulation systems based on openings in the aircraft skin surface, this application avoids openings in the aircraft skin surface, thus reducing flight drag.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An air circulation system based on skin heat exchange, characterized in that, include: Skin (1), on which a skin temperature detection unit (52) is provided; Ventilation duct (6), the ventilation duct (6) includes a main circulation path, a first circulation branch path and a second circulation branch path, the first circulation branch path and the second circulation branch path are connected in parallel and then connected in series with the main circulation path, wherein, A temperature-controlled chamber (3) and a power unit (4) are provided on the main circulation route. The temperature-controlled chamber (3) is equipped with a chamber environment temperature detection unit (51). The first circulation branch is connected in series with a skin heat exchange control branch and a first regulating valve (91). The skin heat exchange control branch includes a skin heat exchange branch and a heat exchange control branch connected in parallel. The skin heat exchange branch is provided with a skin heat exchange unit connected to the skin (1). The heat exchange control branch is provided with a regulating valve. A heating unit (8) and a second regulating valve (92) are connected in series on the second circulation branch; The control unit (7) is connected to the skin temperature detection unit (52), the cabin environment temperature detection unit (51), the power unit (4), the heating unit (8), the first regulating valve (91), the second regulating valve (92), and the regulating valve on the heat exchange control branch, respectively. It is used to control the start and stop and speed of the power unit (4), control the start and stop and heating power of the heating unit (8), and control the opening degree of the first regulating valve (91), the second regulating valve (92), and the regulating valve on the heat exchange control branch according to the temperature signals of the skin temperature detection unit (52) and the cabin environment temperature detection unit (51).

2. The air circulation system based on skin heat exchange according to claim 1, characterized in that, The heat exchange unit of the skin is closely connected to the skin (1).

3. The air circulation system based on skin heat exchange according to claim 1, characterized in that, The heat exchange unit replaces the skin (1) at the corresponding position and together with the skin (1) at the other positions, forms the shape of the aircraft.

4. The air circulation system based on skin heat exchange according to claim 1, characterized in that, At least two heat exchange control branches for the skin are connected in series.

5. The air circulation system based on skin heat exchange according to claim 4, characterized in that, Two heat exchange control branches for the skin are connected in series, wherein... The first skin heat exchange control branch includes a first skin heat exchange branch and a first heat exchange control branch arranged in parallel. A first skin heat exchange unit (21) connected to the skin (1) is provided on the first skin heat exchange branch. A third regulating valve (93) is provided on the first heat exchange control branch. The second skin heat exchange control branch includes a second skin heat exchange branch and a second heat exchange control branch arranged in parallel. The second skin heat exchange branch is provided with a second skin heat exchange unit (22) connected to the skin (1). The second heat exchange control branch is provided with a fourth regulating valve (94).

6. A control method for an air circulation system based on skin heat exchange, based on the air circulation system based on skin heat exchange as described in claim 5, characterized in that, Control methods include: The control unit (7) compares the first temperature signal fed back by the cabin ambient temperature detection unit (51) with the set first temperature threshold, and the second temperature signal fed back by the skin temperature detection unit (52) with the set second temperature threshold: When the first temperature signal is higher than the first temperature threshold and the second temperature signal is lower than the second temperature threshold, the control unit (7) controls the skin heat exchange unit to cool down the temperature control chamber (3); When the first temperature signal is higher than the first temperature threshold and the second temperature signal is higher than the second temperature threshold, the control unit (7) outputs an alarm signal; When the first temperature signal is lower than the first temperature threshold and the second temperature signal is higher than the second temperature threshold, the control unit (7) controls the skin heat exchange unit to heat up the temperature control chamber (3); When the first temperature signal is lower than the first temperature threshold and the second temperature signal is lower than the second temperature threshold, the control unit (7) controls the heating unit (8) to raise the temperature of the temperature-controlled chamber (3).

7. The air circulation system control method based on skin heat exchange according to claim 6, characterized in that, The control unit (7) controls the skin heat exchange unit to cool the temperature-controlled chamber (3), including: In the first stage: the control unit (7) controls the first regulating valve (91) to open, the second regulating valve (92) to close, the third regulating valve (93) to close, the fourth regulating valve (94) to open, and the power unit (4) to start. The air in the temperature control chamber (3) is driven by the power unit (4) and enters the first skin heat exchange unit (21) for heat dissipation through the main circulation path and the first circulation branch path, and then returns to the temperature control chamber (3). In the second stage: the control unit (7) controls the fourth regulating valve (94) to close, and the air in the temperature control chamber (3) is driven by the power unit (4) to enter the first skin heat exchange unit (21) and the second skin heat exchange unit (22) for heat dissipation through the main circulation path and the first circulation branch path, and then returns to the temperature control chamber (3); In the third stage: the control unit (7) controls the power unit (4) to increase the speed.

8. The air circulation system control method based on skin heat exchange according to claim 6, characterized in that, The control unit (7) controls the skin heat exchange unit to heat the temperature-controlled chamber (3), including: In the first stage: the control unit (7) controls the first regulating valve (91) to open, the second regulating valve (92) to close, the third regulating valve (93) to close, the fourth regulating valve (94) to open, and the power unit (4) to start. The air in the temperature control chamber (3) is driven by the power unit (4) and enters the first skin heat exchange unit (21) through the main circulation path and the first circulation branch path for heating, and then returns to the temperature control chamber (3). In the second stage: the control unit (7) controls the fourth regulating valve (94) to close, and the air in the temperature control chamber (3) is driven by the power unit (4) to enter the first skin heat exchange unit (21) and the second skin heat exchange unit (22) through the main circulation path and the first circulation branch for heating, and then returns to the temperature control chamber (3); In the third stage: the control unit (7) controls the power unit (4) to increase the speed.

9. The control method for an air circulation system based on skin heat exchange according to claim 6, characterized in that, The control unit (7) controls the heating unit (8) to raise the temperature of the temperature-controlled chamber (3), including: In the first stage: the control unit (7) controls the first regulating valve (91) to close, the second regulating valve (92) to open, the power unit (4) to start, the heating unit (8) to start and operate at the initial heating power, and the air in the temperature control chamber (3) is driven by the power unit (4) to enter the heating unit (8) for heating through the main circulation path and the second circulation branch path, and then returns to the temperature control chamber (3); In the second stage: the control unit (7) controls the heating unit (8) to increase the heating power.

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