Casing, ram air transfer valve, aircraft air conditioning system

Abstract

The present invention provides a housing, a ram air conversion valve, and an aircraft air conditioning system. The housing includes an air intake housing portion and an air flow housing portion, the air intake housing portion communicating with the air flow housing portion. A ram inlet is formed in the air intake housing portion, the ram inlet being oriented at an angle to the extension direction of the air flow housing portion. The air flow housing portion also includes an inwardly concave recessed area, the recessed area and the ram inlet being located on the same side of the housing. According to the present invention, because the air flow housing portion of the housing is recessed at a location corresponding to a simulated airflow cavity, when the housing is used in a ram air conversion valve, ram air flowing within the air flow housing portion will adhere to the wall, eliminating the airflow cavity within the air flow housing portion. This prevents the air flow housing portion from being repeatedly impacted by free airflow and fatigue damage, thereby eliminating the risk of housing rupture and flight safety hazards.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to a housing, a ram air conversion valve, and an aircraft air conditioning system. Background Art

[0002] Currently, efficient aircraft air conditioning systems rely on ram air heat exchange, and the heat-exchanged gas is discharged through a ram air transfer valve. The ram air transfer valve primarily consists of an outer shell and an inner tube inserted within the outer shell. The outer shell includes an air intake shell portion and an air flow shell portion. The air intake shell portion has a ram inlet. The air flow shell portion is a hollow cylindrical structure with the ram inlet facing upward and forming an angle with the extension direction of the air flow shell portion. The inner tube forms an air inlet and an air outlet at each end, respectively. The air inlet is located within the air flow shell portion, and the air outlet is located outside the outer shell portion. For details, see [Note: The following sentences appear to be unrelated and should likely be omitted.] Figure 8 and Figure 9 After exchanging heat with the bipolar heat exchanger in the aircraft air conditioning system, the ram air enters the outer shell through the ram inlet, then turns and flows through the air inlet into the inner duct before being discharged through the air outlet.

[0003] On this basis, the ram air inside the ram air conversion valve is simulated to obtain the following Figure 10 The airflow diagram shown in the figure shows that as the ram air flows from the ram inlet to the inner tube's air inlet, a clear airflow cavity appears above the inner portion of the airflow shell. The airflow cavity and the ram inlet are located on the same side of the shell. Under the repeated impact of the free flow, the cavity will be subjected to additional unsteady loads, which can easily cause fatigue damage to the structure here. Due to the demand for lightweight aviation equipment, the shell of the ram air conversion valve is often made of a material with a thickness of about 2mm or even thinner. If this thin shell structure suffers fatigue damage, it is easy to rupture, which poses a significant risk to flight safety. At the same time, the cavity will also generate strong aerodynamic noise under free flow, which greatly affects passenger comfort and can also damage internal systems (especially sensitive components) under strong noise. Summary of the Invention

[0004] Therefore, the present invention provides a shell that can solve the technical problem that the shell design of the existing ram air conversion valve is not reasonable, resulting in cavity flow inside the shell. The cavity is easily damaged by fatigue under the repeated impact of the free flow, resulting in the risk of rupture of the shell, thereby posing a huge hidden danger to flight safety.

[0005] In order to solve the above problems, the present invention provides a shell, which is applied to a ram air conversion valve, including an air inlet shell part and an air outlet shell part, the air inlet shell part is connected to the air outlet shell part, a ram inlet is formed on the air inlet shell part, the direction of the ram inlet forms an angle with the extension direction of the air outlet shell part, and an inwardly concave recessed area is formed on the air outlet shell part, and the recessed area and the ram inlet are on the same side of the shell.

[0006] In some embodiments, the air inlet shell portion has a gradually shrinking air duct, which is connected to the interior of the air outlet shell portion. The air duct forms the ram inlet at one end away from the air outlet shell portion. The ram inlet is the widest area of ​​the air duct, and along the circumference of the air outlet shell portion, the width of the recessed area is smaller than the minimum width of the air duct.

[0007] In some embodiments, the air duct corresponds to a first side wall, the first side wall extends along the extension direction of the windshield shell portion, the first side wall has a first reinforcement structure, and the first reinforcement structure is arranged in a horizontal direction on the first side wall.

[0008] In some embodiments, the air duct corresponds to a second side wall, the second side wall extends along the extension direction of the windshield shell portion, the second side wall has a second reinforcement structure, and the second reinforcement structure is arranged horizontally on the second side wall.

[0009] The present invention also provides a ram air conversion valve, comprising the aforementioned housing.

[0010] In some embodiments, an inner tube is inserted into the outer shell, the first end of the inner tube forms an air inlet, and the second end of the inner tube forms an air outlet. The air inlet is located inside the wind-through outer shell portion, and there is a distance between the inner tube and the inner surface of the wind-through outer shell portion. The air outlet is located outside the outer shell, and the air outlet and air inlet are respectively located on both sides of the ram inlet, and an impeller is provided in the inner tube.

[0011] In some embodiments, an air bleed port is constructed on the inner tube, and the position of the air bleed port corresponds to the position of the ram inlet. A one-way valve is provided on the inner tube, and the one-way valve is used to open and close the air bleed port. The one-way valve rotates in a direction away from the ram inlet to open the air bleed port, and the one-way valve rotates in a direction close to the ram inlet to close the air bleed port; a pneumatic component is connected to the one-way valve, and the pneumatic component is inside the inner tube. The pneumatic component can apply a force to the one-way valve toward the direction of the ram inlet under the action of the airflow driven by the impeller.

[0012] In some embodiments, the pneumatic component has a curved surface facing the one-way valve and a flat surface facing away from the one-way valve, there is a distance between the curved surface and the one-way valve, and the curved surface protrudes toward the side where the one-way valve is located.

[0013] In some embodiments, the impeller is located between the air bleed port and the air inlet, the one-way valve has a first side close to the impeller, and the pneumatic component is close to the first side of the one-way valve.

[0014] The present invention also provides an aircraft air conditioning system comprising the aforementioned ram air conversion valve.

[0015] The present invention provides a housing, a ram air transfer valve, and an aircraft air conditioning system, which have the following beneficial effects:

[0016] Because the airflow section of the housing of the present application is recessed in locations corresponding to the simulated airflow cavities, when the housing is used for a ram air transfer valve, the ram air flowing within the airflow section will follow the wall, resulting in a more uniform flow distribution. Consequently, there are no airflow cavities within the airflow section, preventing the section from being repeatedly impacted by the free flow and suffering fatigue damage. This eliminates the risk of the housing rupturing, thus naturally eliminating flight safety hazards. Furthermore, the elimination of airflow cavities reduces the flow resistance of the ram air within the airflow section by at least 500 Pa. This reduced flow resistance improves flow efficiency, thereby enhancing the heat exchange efficiency of the aircraft's air conditioning system. Furthermore, the elimination of airflow cavities within the airflow section also reduces the aerodynamic noise generated thereby, improving passenger comfort and reducing the threat of aerodynamic noise damaging sensitive components within the aircraft's internal systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0018] Figure 1 A schematic diagram of a housing of a ram air transfer valve according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a simulation of ram air flowing within a housing of a ram air transfer valve according to an embodiment of the present invention;

[0020] Figure 3Schematic diagram showing a simulation comparison of the first-order natural frequency of the housing of the ram air transfer valve according to an embodiment of the present invention when a reinforcing rib is provided and when no reinforcing rib is provided;

[0021] Figure 4 A perspective view of a ram air transfer valve according to an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of an inner tube of a ram air diversion valve according to an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of a one-way valve of a ram air conversion valve according to an embodiment of the present invention;

[0024] Figure 7 A cross-sectional view of a one-way valve of a ram air conversion valve according to an embodiment of the present invention;

[0025] Figure 8 A perspective view of a ram air conversion valve in the prior art;

[0026] Figure 9 A schematic diagram of a housing of a ram air conversion valve in the prior art;

[0027] Figure 10 FIG. 1 is a schematic diagram of a simulation of the flow of ram air in a housing of a ram air conversion valve in the prior art. FIG.

[0028] The reference numerals indicate:

[0029] 1. Air inlet shell; 2. Air passage shell; 3. Ram inlet; 4. Recessed area; 5. First side wall; 6. First reinforcement structure; 7. Second side wall; 8. Second reinforcement structure; 9. Inner tube; 10. Impeller; 11. One-way valve; 12. Flow guide structure; 13. Air cycle machine; 14. Ram air; 15. Air inlet; 16. Pneumatic components. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0032] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0033] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0034] See also Figures 1 to 10 As shown, according to an embodiment of the present invention, a housing is provided for use with a ram air conversion valve, comprising an air inlet housing portion 1 and an air outlet housing portion 2. The air inlet housing portion 1 is connected to the air outlet housing portion 2. A ram inlet 3 is formed on the air inlet housing portion 1. The direction of the ram inlet 3 forms an angle with the extension direction of the air outlet housing portion 2. An inwardly recessed recessed area 4 is formed on the air outlet housing portion 2. The recessed area 4 and the ram inlet 3 are located on the same side of the housing.

[0035] In this technical solution, because the airflow housing portion 2 of the housing of the present application is recessed at locations corresponding to the simulated airflow cavities, when the housing is used for the ram air transfer valve, the ram air 14 flowing within the airflow housing portion 2 will follow the wall, resulting in a more uniform flow distribution. Consequently, there are no airflow cavities within the airflow housing portion 2, preventing fatigue damage caused by repeated impacts from the free flow. This eliminates the risk of the housing rupture, thus eliminating flight safety hazards. Furthermore, the elimination of airflow cavities reduces the flow resistance of the ram air 14 within the airflow housing portion 2 by at least 500 Pa. This reduced flow resistance improves flow efficiency, thereby enhancing the heat exchange efficiency of the aircraft's air conditioning system. Furthermore, the elimination of airflow cavities within the airflow housing portion 2 also reduces the aerodynamic noise generated thereby, improving passenger comfort and reducing the threat of aerodynamic noise damaging sensitive components within the aircraft's internal systems.

[0036] See also Figure 1 As shown, the air inlet shell part 1 has a gradually shrinking air duct, which is connected to the interior of the air outlet shell part 2. A stamping inlet 3 is formed at one end of the air duct away from the air outlet shell part 2. The stamping inlet 3 is the widest area of ​​the air duct. Along the circumference of the air outlet shell part 2, the width of the recessed area 4 is smaller than the minimum width of the air duct.

[0037] In this embodiment, the gradually converging air duct of the air inlet housing portion 1 accelerates the flow of the heat-exchanged ram air 14 within the housing, thereby facilitating rapid discharge of the heat-exchanged air from the ram air diversion valve. Because the airflow, after entering the duct, bends toward the air inlet of the inner tube 9, and the simulated airflow cavity is formed during this deflection, the size of the airflow cavity is constrained by the minimum width of the duct. Only when the width of the recessed area 4 along the circumference of the airflow housing portion 2 is less than the minimum width of the duct can the size of the recessed area 4 correspond to the size of the airflow cavity. This ensures that the recessed area 4 is appropriately sized and avoids unnecessarily large recesses in the airflow housing portion 2.

[0038] See also Figure 1 As shown, the air duct corresponds to a first side wall 5 , which extends along the extension direction of the windshield shell portion 2 , and has a first reinforcement structure 6 on the first side wall 5 .

[0039] As mentioned in the background of this technical solution, driven by the demand for lightweight aviation equipment, the outer shell of the ram air transfer valve is often made of materials approximately 2 mm thick or even thinner. While this thin shell structure offers greater flexibility, it also results in lower rigidity and a lower natural frequency, making it more susceptible to deformation when subjected to stress. The air duct is the primary location subjected to ram air, and ram air is an unsteady flow. Under its impact, the outer shell portion corresponding to the air duct is prone to high-frequency vibration. This can lead to gas leakage at the interface between components, affecting the operation of other components, or even damage components, threatening flight safety. Therefore, by providing a first reinforcement structure 6 on the first side wall 5 corresponding to the air duct, the first-order natural frequency of the outer shell can be optimized, reducing the amount of deformation during operation, thereby extending the service life of the ram air transfer valve. Furthermore, the provision of the first reinforcement structure 6 can reduce the gas excitation force of the ram air, thereby improving flight comfort and stability. The first reinforcement structure 6 can be a rib integrally formed on the first side wall 5.

[0040] It should be noted that Figure 3 A schematic diagram comparing the first-order natural frequency of the ram air transfer valve housing with and without ribs is shown in a simulation. The figure shows that the housing with ribs significantly improves its first-order natural frequency compared to the housing without ribs. Overall, the ribs increase the housing's natural frequency by 33%, a significant improvement. The figure also shows that the first-order natural frequency increases the most when the ribs are positioned at an angle close to 90°, while the improvement is minimal when the ribs are positioned at an angle close to 30°. A 0° rib angle indicates that the ribs are positioned vertically on the housing, while a 90° rib angle indicates that the ribs are positioned horizontally. To maximize the first-order natural frequency of the housing, the first reinforcement structure 6 is preferably arranged horizontally on the first sidewall 5.

[0041] See also Figure 1 As shown, the air duct corresponds to a second side wall 7 , the second side wall 7 extends along the extension direction of the windshield shell part 2 , and the second side wall 7 is provided with a second reinforcement structure 8 .

[0042] In this embodiment, the second sidewall 7 is opposite the first sidewall 5. When a second reinforcement structure 8 is provided on the second sidewall 7, the first-order natural frequency of the housing can be further increased. To maximize the first-order natural frequency of the housing, the second reinforcement structure 8 is preferably arranged horizontally on the second sidewall 7. More preferably, the second reinforcement structure 8 and the first reinforcement structure 6 are symmetrically distributed on the housing. The second reinforcement structure 8 can be a reinforcing rib integrally formed on the second sidewall 7.

[0043] The present invention also provides a ram air conversion valve, comprising the aforementioned housing.

[0044] See also Figure 4 As shown, an inner tube 9 is inserted into the outer shell, the first end of the inner tube 9 forms an air inlet, and the second end of the inner tube 9 forms an air outlet. The air inlet is located inside the wind-through outer shell part 2, and there is a distance between the inner tube 9 and the inner surface of the wind-through outer shell part 2. The air outlet is located outside the outer shell, and the air outlet and the air inlet are respectively located on both sides of the stamping inlet 3. An impeller 10 is provided in the inner tube 9, and the impeller 10 is close to the air inlet.

[0045] In this technical solution, when the aircraft is on the ground, the airflow after exchanging heat with the dual heat exchanger in the aircraft air conditioning system cannot naturally enter through the ram inlet 3 and be discharged after flowing through the inner tube 9. However, if the impeller 10 is provided in the inner tube 9 and is close to the air inlet of the inner tube 9, the rotation of the impeller 10 can drive the airflow to exchange heat with the dual heat exchanger, then enter the ram air transfer valve through the ram inlet 3 and finally be discharged through the inner tube 9, thus achieving normal heat exchange for the aircraft air conditioning system.

[0046] See also Figure 4 As shown, the inner tube 9 includes a straight tube section and an expanded section connected to each other. The end of the straight tube section away from the expanded section forms an air inlet, and the section of the expanded section away from the straight tube section forms an air outlet. The impeller 10 is arranged in the straight tube section, so that it has a wind gathering effect when the impeller 10 is working. The expanded section is a tube body with a gradually increasing inner diameter. The design of the expanded section is conducive to the rapid discharge of airflow from the ram air conversion valve. A guide structure 12 is also provided in the expanded section. The guide structure 12 is close to the straight tube section. The guide structure 12 is used to rectify the airflow driven by the impeller 10, and is also conducive to the rapid discharge of airflow from the ram air conversion valve. The guide structure 12 can be composed of a hub and a plurality of blades arranged circumferentially along the hub.

[0047] See also Figure 5As shown, an air inlet 15 is constructed on the inner tube 9, and the position of the air inlet 15 corresponds to the position of the stamping inlet 3. A one-way valve 11 is provided on the inner tube 9, and the one-way valve 11 is used to open and close the air inlet 15; when the pressure on the one-way valve 11 is greater than the set pressure, the one-way valve 11 opens the air inlet 15, and when the pressure on the one-way valve 11 is less than the set pressure, the one-way valve 11 closes the air inlet 15.

[0048] In this embodiment, when an aircraft is in flight, high-speed airflow flows in a direction opposite to the aircraft's flight direction. After passing through the bipolar heat exchanger, this high-speed airflow enters the ram air inlet 3, then turns and enters the inner tube 9 through the air inlet, ultimately exiting through the inner tube 9's air outlet. Because the high-speed airflow automatically acts on the ram air conversion valve of the air conditioning system while the aircraft is in flight, the impeller 10 in the inner tube 9 does not need to be activated to bleed air. However, the high-speed airflow passing through the impeller 10 drives it to rotate, generating a reaction force on the power mechanism connected to the impeller 10, which can easily damage the power mechanism. This is achieved by constructing an air bleed port 15 on the inner tube 9, providing a one-way valve 11 at the air bleed port 15 for opening and closing the air bleed port 15, and providing a torsion spring to cooperate with the one-way valve 11. When the one-way valve 11 is not under pressure, the torsion spring causes the one-way valve 11 to close the air bleed port 15; when the pressure on the one-way valve 11 is greater than the set pressure, the torsion spring is compressed, causing the one-way valve 11 to open the air bleed port 15. With this design, when the aircraft is flying in the air, the high-speed airflow enters through the ram inlet 3 and acts on the one-way valve 11, causing the one-way valve 11 to open. Then, most of the high-speed airflow does not flow through the impeller 10 but is directly discharged from the air outlet of the inner tube 9. This can greatly reduce the force applied by the high-speed airflow to the impeller 10, thereby protecting the power mechanism that drives the impeller 10 to rotate. When the aircraft is on the ground, the pressure generated by the airflow driven by the working impeller 10 is relatively small and is not enough to open the one-way valve 11. The airflow still flows and is discharged along the original normal path, ensuring that the air conditioning system still exchanges heat normally.

[0049] See also Figure 6 and Figure 7 As shown, the one-way valve 11 rotates away from the ram inlet 3 to open the air inlet 15, and rotates toward the ram inlet 3 to close the air inlet 15. A pneumatic component 16 is connected to the one-way valve 11 and is located within the inner tube 9. The airflow driven by the impeller 10 can force the one-way valve 11 toward the ram inlet 3.

[0050] In this technical solution, after frequent opening and closing of the one-way valve 11, the torsion spring will experience deformation fatigue, preventing the one-way valve 11 from closing the air bleed port 15. If the one-way valve 11 fails to close tightly while the aircraft is on the ground and using air conditioning, the airflow driven by the impeller 10 will leak from the air bleed port 15, reducing the efficiency of the impeller 10. The airflow also becomes turbulent, causing noise and vibration, impairing the operation of the ram air transfer valve and further damaging the ram air transfer valve and related equipment. Therefore, it is necessary to ensure the airtightness of the one-way valve 11 when closed. This application connects a pneumatic component 16 to the one-way valve 11, and causes the pneumatic component 16 to apply a force toward the ram inlet 3 to the one-way valve 11 under the action of the airflow driven by the impeller 10. This allows the one-way valve 11 to close the air bleed port 15 when the impeller 10 is operating, thereby preventing airflow leakage from the air bleed port 15 and noise and vibration from the ram air transfer valve.

[0051] See also Figure 6 and Figure 7 As shown, the pneumatic component 16 has an arc surface facing the one-way valve 11 and a plane facing away from the one-way valve 11 , there is a distance between the arc surface and the one-way valve 11 , and the arc surface is convex toward the side where the one-way valve 11 is located.

[0052] In this embodiment, according to Bernoulli's principle, the airflow velocity when flowing through the plane of the pneumatic component 16 is less than the airflow velocity when flowing through the curved surface of the pneumatic component 16. Therefore, the pressure of the airflow on the plane is greater than the pressure of the airflow on the curved surface. This can provide an upward force for the one-way valve 11, thereby achieving the closure of the one-way valve 11. The pneumatic component 16 can be suspended from the one-way valve 11 via multiple connectors.

[0053] See also Figures 4 to 7 As shown, the impeller 10 is located between the air inlet 15 and the air inlet, the one-way valve 11 has a first side close to the impeller 10 , and the pneumatic component 16 is close to the first side of the one-way valve 11 .

[0054] In this technical solution, when the pneumatic component 16 is close to the first side of the one-way valve 11, it indicates that the pneumatic component 16 is located closer to the impeller 10 on the one-way valve 11. Then the amount of air applied by the impeller 10 to the pneumatic component 16 will be greater, and the force applied by the pneumatic component 16 to the one-way valve 11 due to the pressure difference will be greater, and ultimately the one-way valve 11 will be closed more tightly.

[0055] The present invention further provides an aircraft air conditioning system, comprising the aforementioned ram air conversion valve and an air cycle machine 13 , wherein the air cycle machine 13 is configured to deliver conditioned air into the cabin.

[0056] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A housing for a ram air transfer valve, characterized in that: The invention comprises an air inlet shell part (1) and an air outlet shell part (2), wherein the air inlet shell part (1) is connected to the air outlet shell part (2), a punching inlet (3) is formed on the air inlet shell part (1), an angle is formed between the direction of the punching inlet (3) and the extension direction of the air outlet shell part (2), and an inwardly recessed recessed area (4) is formed on the air outlet shell part (2), and the recessed area (4) and the punching inlet (3) are located on the same side of the shell.

2. The housing according to claim 1, wherein The air inlet shell part (1) has a gradually shrinking air duct, which is connected to the interior of the air outlet shell part (2). The air duct forms the ram inlet (3) at one end away from the air outlet shell part (2). The ram inlet (3) is the widest area of ​​the air duct. Along the circumference of the air outlet shell part (2), the width of the recessed area (4) is smaller than the minimum width of the air duct.

3. The housing according to claim 2, wherein: The air duct corresponds to a first side wall (5), the first side wall (5) extends along the extension direction of the wind-passing shell part (2), the first side wall (5) has a first reinforcement structure (6), and the first reinforcement structure (6) is arranged in a horizontal direction on the first side wall (5).

4. The housing according to claim 2, wherein: The air duct corresponds to a second side wall (7), the second side wall (7) extends along the extension direction of the wind-passing shell part (2), the second side wall (7) has a second reinforcement structure (8), and the second reinforcement structure (8) is arranged in a horizontal direction on the second side wall (7).

5. A ram air conversion valve, characterized in that: Comprising the housing according to any one of claims 1 to 4.

6. The ram air switching valve according to claim 5, characterized in that: An inner tube (9) is inserted into the outer shell, a first end of the inner tube (9) forms an air inlet, a second end of the inner tube (9) forms an air outlet, the air inlet is located inside the airflow outer shell portion (2), a distance is provided between the inner tube (9) and the inner surface of the airflow outer shell portion (2), the air outlet is located outside the outer shell, and the air outlet and the air inlet are respectively located on both sides of the ram inlet (3), and an impeller (10) is provided in the inner tube (9).

7. The ram air conversion valve according to claim 6, characterized in that: An air inlet (15) is constructed on the inner tube (9), and the position of the air inlet (15) corresponds to the position of the ram inlet (3). A one-way valve (11) is provided on the inner tube (9), and the one-way valve (11) is used to open and close the air inlet (15). The one-way valve (11) rotates in a direction away from the ram inlet (3) to open the air inlet (15), and the one-way valve (11) rotates in a direction close to the ram inlet (3) to close the air inlet (15); a pneumatic component (16) is connected to the one-way valve (11), and the pneumatic component (16) is located inside the inner tube (9). Under the action of the airflow driven by the impeller (10), the pneumatic component (16) can apply a force to the one-way valve (11) in the direction of the ram inlet (3).

8. The ram air switching valve according to claim 7, characterized in that: The pneumatic component (16) has an arc surface facing the one-way valve (11) and a plane facing away from the one-way valve (11), a distance is provided between the arc surface and the one-way valve (11), and the arc surface is convex toward the side where the one-way valve (11) is located.

9. The ram air switching valve according to claim 7 or 8, characterized in that: The impeller (10) is located between the air inlet (15) and the air inlet, the one-way valve (11) has a first side close to the impeller (10), and the pneumatic component (16) is close to the first side of the one-way valve (11).

10. An aircraft air conditioning system, characterized in that: A ram air conversion valve comprising the ram air conversion valve according to any one of claims 5 to 9.

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