Shell, ram air conversion valve and aircraft air conditioning system

Abstract

The invention provides a shell, a ram air conversion valve and an aircraft air conditioning system.The shell comprises an air inlet shell part and an air passing shell part, the air inlet shell part communicates with the air passing shell part, a ram inlet is formed in the air inlet shell part, and an included angle is formed between the direction of the ram inlet and the extending direction of the air passing shell part; a sunken area which is sunken inwards is formed in the air passing shell part, and the sunken area and the stamping inlet are located on the same side of the shell. According to the ram air conversion valve, the air passing shell part of the shell is subjected to sunken treatment corresponding to the airflow cavity obtained through simulation, so that after the shell is applied to the ram air conversion valve, ram air flows in the air passing shell part and advances along the wall, and the airflow cavity does not exist in the air passing shell part; and the wind passing shell part cannot be repeatedly impacted by the free incoming flow to cause fatigue damage, so that the shell has no fracture risk, and the flight potential safety hazard is naturally eliminated.

Description

Technical Field

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

[0002] At present, the efficient operation of aircraft air conditioning systems is inseparable from the heat exchange of ram air, and the gas after heat exchange is discharged by the ram air conversion valve. The ram air conversion valve is mainly composed of an outer shell and an inner tube inserted in the outer shell. Among them, the outer shell includes an air inlet outer shell part and an air flow outer shell part. The air inlet outer shell part has a ram inlet. The air flow outer shell part is a hollow cylindrical structure. The ram inlet faces upward and forms an angle with the extension direction of the air flow outer shell part. The two ends of the inner tube form an air inlet and an air outlet respectively. The air inlet is inside the air flow outer shell part, and the air outlet is outside the outer shell. For details, see Figure 8 and Fig. 9 After exchanging heat with the bipolar heat exchanger of the aircraft air conditioning system, the ram air enters the outer shell from the ram inlet, then turns and flows into the inner tube from the air inlet, and finally is discharged from the air outlet.

[0003] On this basis, the ram air inside the ram air conversion valve is simulated to obtain the following Fig.10 The schematic diagram of airflow is shown in the figure. It can be seen that in the process of the ram air turning from the ram inlet to the air inlet of the inner tube, an obvious airflow cavity appears above the inner part of the wind-passing shell. The airflow cavity and the ram inlet are on the same side of the shell. The cavity will bear additional unsteady loads under the repeated impact of the free flow, which is easy to cause fatigue damage to the structure here. Influenced by the lightweight demand of 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 is fatigue-damaged, it is easy to break, which poses a great hidden danger to flight safety. At the same time, the cavity will also generate strong aerodynamic noise under free flow. This strong noise greatly affects the riding comfort of passengers, and the internal system (especially sensitive components) may also be damaged 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, and the cavity is prone to fatigue damage to the shell under the repeated impact of the free flow, resulting in the risk of rupture of the shell, thereby posing a great 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 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 end of the air duct away from the air outlet shell portion forms the ram inlet, and the ram inlet is the widest area of ​​the air duct. 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 wind passing 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 wind passage outer shell portion, the second side wall has a second reinforcement structure, and the second reinforcement structure is arranged in a horizontal direction 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, the second end of the inner tube forms an air outlet, the air inlet is located inside the wind passing outer shell portion, there is a distance between the inner tube and the inner surface of the wind passing 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 in 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 shell, ram air conversion valve, and aircraft air conditioning system provided by the present invention have the following beneficial effects:

[0016] Since the airflow shell part of the shell of the present application is recessed at the position corresponding to the airflow cavity obtained by simulation, when the shell is applied to the ram air conversion valve, the ram air will flow along the wall when flowing in the airflow shell part, and the flow distribution is more uniform, so there is no airflow cavity in the airflow shell part, and the airflow shell part will not be repeatedly impacted by the free flow and fatigue damage will occur, so the shell does not have the risk of rupture, and the flight safety hazard is naturally eliminated. At the same time, the elimination of the airflow cavity also reduces the flow resistance of the ram air in the airflow shell part by at least 500Pa. The reduction of flow resistance improves the flow efficiency, and then the heat exchange efficiency of the aircraft air conditioning system is also improved. Furthermore, the elimination of the airflow cavity in the airflow shell part also eliminates the aerodynamic noise generated thereby, which not only improves the riding comfort of the aircraft passengers, but also eliminates the threat of aerodynamic noise to the sensitive components of the aircraft internal system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

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

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

[0020] Figure 3It is a schematic diagram for simulation comparison of the first-order natural frequency of the housing of the ram air conversion valve according to an embodiment of the present invention when a reinforcing rib is provided on the housing and when a reinforcing rib is not provided on the housing;

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

[0022] Figure 5 A schematic diagram of an inner tube of a ram air conversion 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] Fig. 9 A schematic diagram of a housing of a ram air conversion valve in the prior art;

[0027] Fig.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.

[0028] The reference numerals are as follows:

[0029] 1. Air inlet shell part; 2. Air passing shell part; 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. Guide structure; 13. Air cycle machine; 14. Ram air; 15. Air inlet; 16. Pneumatic parts. DETAILED DESCRIPTION

[0030] The following will be combined with the 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 described embodiments 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 by no means 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 creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the 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 devices or elements 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 contours 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 here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. 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 figure. For example, if the device in the accompanying 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. If not 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, which is applied to a ram air conversion valve, and includes 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. A recessed area 4 recessed inwardly is formed on the air outlet housing portion 2. The recessed area 4 and the ram inlet 3 are on the same side of the housing.

[0035] In this technical solution, since the airflow shell part 2 of the shell of the present application is recessed at the position corresponding to the airflow cavity obtained by simulation, when the shell is applied to the ram air conversion valve, the ram air 14 will flow along the wall when flowing in the airflow shell part 2, and the flow distribution will be more uniform, so that there is no airflow cavity in the airflow shell part 2, and the airflow shell part 2 will not be repeatedly impacted by the free flow and fatigue damage will occur, so the shell does not have the risk of rupture, and the flight safety hazard is naturally eliminated. At the same time, the elimination of the airflow cavity also reduces the flow resistance of the ram air 14 in the airflow shell part 2 by at least 500Pa. The reduction of flow resistance improves the flow efficiency, and then the heat exchange efficiency of the aircraft air conditioning system is also improved. Further, the elimination of the airflow cavity in the airflow shell part 2 also eliminates the aerodynamic noise generated thereby, which not only improves the riding comfort of aircraft passengers, but also eliminates the threat of aerodynamic noise to the sensitive components of the aircraft internal system.

[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 air inlet shell part 1 is provided with a gradually shrinking air duct, so that the ram air 14 after heat exchange can be accelerated to flow in the shell, thereby facilitating the rapid discharge of the air flow after heat exchange from the ram air conversion valve. Because the air flow will bend to the air inlet of the inner tube 9 after entering the air duct, and the air flow cavity obtained by simulation is formed in the process of the air flow bending, the size of the air flow cavity is subject to the minimum width of the air duct. Only when the width of the recessed area 4 along the circumference of the air passing shell part 2 is less than the minimum width of the air duct, can the size of the recessed area 4 be guaranteed to correspond to the size of the air flow cavity, so that the recessed area 4 of appropriate size can be obtained without forming an unnecessary excessive area recess on the air passing shell part 2.

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

[0039] In this technical solution, the background technology has been mentioned. Influenced by the lightweight demand of 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. Although this thin shell structure has greater flexibility, it also leads to lower rigidity and lower natural frequency, making it easier to deform when subjected to force. The air duct is the primary part that bears the ram air. The ram air is an unsteady flow. Under its impact, the shell part corresponding to the air duct is prone to high-frequency vibration, which may cause gas leakage at the joint position of the components, affecting the working state of other components, or even cause component damage, threatening flight safety. Therefore, by studying the provision of the first reinforcement structure 6 on the first side wall 5 corresponding to the air duct, the first-order natural frequency of the shell can be optimized, the deformation of the shell in the working state can be reduced, and the service life of the ram air conversion valve can be extended. Moreover, by providing the first reinforcement structure 6, the gas excitation force of the ram air can be reduced, thereby improving the comfort and stability of the flight. Among them, the first reinforcement structure 6 can be a reinforcement rib integrally formed on the first side wall 5.

[0040] It should be noted that Figure 3 The figure shows a simulation comparison diagram of the first-order natural frequency of the shell of the ram air conversion valve of the embodiment of the present invention when the ribs are set and when the ribs are not set. It can be seen from the figure that the first-order natural frequency of the shell with the ribs is significantly improved compared with the shell without the ribs. Overall, after the ribs are set, the natural frequency of the shell is increased by 33%, and the improvement effect is significant. It can also be seen from the figure that when the setting angle of the ribs is close to 90°, the first-order natural frequency of the shell is increased the most, and when the setting angle of the ribs is close to 30°, the first-order natural frequency of the shell is increased the least. Among them, when the setting angle of the ribs is 0°, it means that the ribs are set up and down on the shell, and when the setting angle of the ribs is 90°, it means that the ribs are set horizontally on the shell. In order to enable the first reinforcement structure 6 to maximize the first-order natural frequency of the shell, preferably, the first reinforcement structure 6 is arranged in the horizontal direction on the first side wall 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 wind passing shell part 2 , and the second side wall 7 is provided with a second reinforcement structure 8 .

[0042] In this embodiment, the second side wall 7 is opposite to the first side wall 5. When the second reinforcing structure 8 is provided on the second side wall 7, the first-order natural frequency of the housing can be further improved. In order to maximize the first-order natural frequency of the housing by the second reinforcing structure 8, preferably, the second reinforcing structure 8 is arranged in the horizontal direction on the second side wall 7. More preferably, the second reinforcing structure 8 and the first reinforcing structure 6 are symmetrically distributed on the housing. Among them, the second reinforcing structure 8 can be a reinforcing rib integrally formed on the second side wall 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 in 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 passing outer shell part 2, and there is a distance between the inner tube 9 and the inner surface of the wind passing 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 arranged 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 heat exchange with the dual heat exchanger of the aircraft air conditioning system cannot naturally enter from the ram inlet 3 and be discharged after flowing through the inner tube 9. However, when the impeller 10 is arranged in the inner tube 9 and the impeller 10 is close to the air inlet of the inner tube 9, as long as the impeller 10 rotates, the airflow can be driven to exchange heat with the dual heat exchanger, and then enter the ram air conversion valve from the ram inlet 3, and finally be discharged from the inner tube 9, thereby realizing normal heat exchange of 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. An end of the straight tube section away from the expanded section forms an air inlet, and a 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 arranged 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 it 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 the aircraft is flying in the air, there will be airflow at high speed in the direction opposite to the flight direction, and the high-speed airflow will enter from the ram inlet 3 after passing through the bipolar heat exchanger, then turn to enter the inner tube 9 from the air inlet, and finally be discharged from the air outlet of the inner tube 9. Since the high-speed airflow can automatically act on the ram air conversion valve of the air conditioning system when the aircraft is flying in the air, the impeller 10 in the inner tube 9 does not need to be started to bleed air. However, when the high-speed airflow passes through the impeller 10, it will drive the impeller 10 to rotate, thereby generating a reaction force on the power mechanism connected to the impeller 10, which is very easy to damage the power mechanism. By constructing an air bleed port 15 on the inner tube 9, and setting a one-way valve 11 for opening and closing the air bleed port 15 at the air bleed port 15, and then setting 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 inlet 15; when the pressure on the one-way valve 11 is greater than the set pressure, the torsion spring is compressed to cause the one-way valve 11 to open the air inlet 15. With such a 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. 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 impeller 10 is small and insufficient 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 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. The one-way valve 11 is connected to a pneumatic component 16, which is located in the inner tube 9. The pneumatic component 16 can exert a force on the one-way valve 11 in the direction of the ram inlet 3 under the action of the airflow driven by the impeller 10.

[0050] In this technical solution, after the one-way valve 11 is frequently opened and closed, the torsion spring will be deformed and fatigued, so that the one-way valve 11 cannot close the air inlet 15. When the aircraft is on the ground and using air conditioning, if the one-way valve 11 cannot be closed, the airflow driven by the impeller 10 will leak from the air inlet 15, thereby reducing the efficiency of the impeller 10. At the same time, the airflow becomes turbulent, resulting in the occurrence of noise and vibration, which damages the working state of the ram air conversion valve and further damages the ram air conversion valve and related equipment. Therefore, the airtightness of the one-way valve 11 when closed must be ensured. In this application, a pneumatic component 16 is connected to the one-way valve 11, and the pneumatic component 16 applies a force to the one-way valve 11 in the direction of the ram inlet 3 under the action of the airflow driven by the impeller 10, so that when the impeller 10 is working, the one-way valve 11 can close the air inlet 15, thereby avoiding the airflow from leaking from the air inlet 15 and causing the ram air conversion valve to have noise and vibration.

[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 protrudes toward the side where the one-way valve 11 is located.

[0052] In this embodiment, according to Bernoulli's principle, the speed of the airflow when flowing through the plane of the pneumatic component 16 is less than the speed of the airflow when flowing through the curved surface of the pneumatic component 16, so the pressure of the airflow acting on the plane is greater than the pressure of the airflow acting on the curved surface, which can provide an upward force for the one-way valve 11, thereby achieving the tight closure of the one-way valve 11. The pneumatic component 16 can be suspended on the one-way valve 11 through multiple connecting parts.

[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 on the one-way valve 11 at a position closer to the impeller 10. Then, the air volume 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 used to deliver conditioned air into the cabin.

[0056] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0057] The above are only 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 in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A housing for a ram air conversion 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 depression 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, characterized in that The air inlet shell part (1) has a gradually contracting air duct, which is connected to the interior of the air outlet shell part (2). The end of the air duct away from the air outlet shell part (2) forms the ram inlet (3), and 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, characterized in that The air duct corresponds to a first side wall (5), the first side wall (5) extends along the extension direction of the wind passage outer shell part (2), the first side wall (5) has a first reinforcement structure (6), and the first reinforcement structure (6) is arranged on the first side wall (5) along the horizontal direction.

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

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

6. The ram air conversion valve according to claim 5, characterized in that: An inner tube (9) is inserted into the outer shell, the first end of the inner tube (9) forms an air inlet, the second end of the inner tube (9) forms an air outlet, the air inlet is located inside the air passing outer shell part (2), there is a distance between the inner tube (9) and the inner surface of the air passing 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 ram inlet (3), and an impeller (10) is arranged in the inner tube (9).

7. The ram air conversion valve according to claim 6, characterized in that: The inner tube (9) is provided with an air inlet (15), the position of which corresponds to the position of the ram inlet (3); the inner tube (9) is provided with a one-way valve (11), the one-way valve (11) being 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); the one-way valve (11) is connected to a pneumatic component (16), the pneumatic component (16) is located inside the inner tube (9), and the pneumatic component (16) can apply a force to the one-way valve (11) in the direction of the ram inlet (3) under the action of the airflow driven by the impeller (10).

8. The ram air conversion 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), there is a distance between the arc surface and the one-way valve (11), and the arc surface protrudes toward the side where the one-way valve (11) is located.

9. 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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