Ram air valve, ram air valve reinforcement design method, aircraft air conditioning

Abstract

The present invention provides a ram air valve, a ram air valve reinforcement rib design method, and an aircraft air conditioner. The ram air valve comprises: a housing having a heat exchanger duct housing matingly connected to the hot-side end face of a heat exchanger and a fan duct housing matingly connected to the end face of a fan volute of an air cycle machine, the fan duct housing having a circular cross-section; the heat exchanger duct housing comprising a first vertical wall and a second vertical wall parallel to and spaced apart from a radial plane of the fan duct housing; the heat exchanger duct housing further comprising a first side wall and a second side wall connected between the first vertical wall and the second vertical wall and arranged parallel to and spaced apart from each other, the first side wall and the second side wall having reinforcement ribs integrally formed thereon. The present invention eliminates damage to the heat exchanger duct housing base material caused by the reinforcement ribs, prevents delamination of the material, improves the ability of the heat exchanger duct housing to withstand vertical loads applied by the heat exchanger, etc., reduces deformation and displacement under the same load, and thereby increases the service life of the component.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to a ram air valve, a ram air valve reinforcement rib design method, and an aircraft air conditioner. Background Art

[0002] The ram air valve provides a cooling channel for the heat exchanger in the aircraft's air cycle machine, allowing the heat exchanger to cool the compressor and turbine inlet air through convective heat transfer. The ram air valve primarily consists of a check valve, guide vanes, and a casing. The ram air valve is installed with the corresponding air cycle machine and heat exchanger. When the aircraft is on the ground, the ram air valve primarily collects air for the fan and provides an exhaust duct. After takeoff, the incoming ram air pressure is sufficient to open the check valve on the inner tube, allowing some ram air to be discharged directly through the check valve. Because the upstream heat exchanger directly acts on the ram air valve, and the ram air valve is connected to the air cycle machine only by clamps, it is essential to ensure that the composite material ram air valve has the structural strength required for reliable operation of the equipment.

[0003] To improve the structural strength of the ram air valve, conventional techniques often employ adhesive rivets to form corresponding reinforcement ribs on the wall of the ram air valve. However, this method of forming reinforcement ribs may cause premature damage to the base material of the ram air valve and material delamination. Summary of the Invention

[0004] Therefore, the present invention provides a ram air valve, a ram air valve reinforcement rib design method, and an aircraft air conditioner, which can solve the technical problem in the prior art of using a glue riveting process to form reinforcement ribs on ram air valves, resulting in pre-damage to the base material and material delamination.

[0005] In order to solve the above problems, the present invention provides a ram air valve, comprising:

[0006] a housing having a heat exchanger duct housing cooperatively connected to a hot-side end face of the heat exchanger and a fan duct housing cooperatively connected to an end face of a fan volute of the air cycle machine, wherein the cross section of the fan duct housing is circular;

[0007] The heat exchanger air duct housing includes a first vertical wall and a second vertical wall parallel to the radial plane of the fan air duct housing and spaced apart from each other. The heat exchanger air duct housing also includes a first side wall and a second side wall connected between the first vertical wall and the second vertical wall and arranged in parallel and spaced apart. The first side wall and the second side wall are integrally formed with reinforcing ribs.

[0008] In some embodiments,

[0009] The reinforcing ribs are molded on the heat exchanger air duct shell; and / or the reinforcing ribs protrude from the outer wall surface of the heat exchanger air duct shell.

[0010] In some embodiments,

[0011] Two reinforcing ribs are respectively provided on the first side wall and the second side wall. The first side wall has a symmetry plane parallel to the first vertical wall. The two reinforcing ribs are symmetrical about the symmetry plane, and the length extension direction of each reinforcing rib is parallel to the height extension direction of the first vertical wall.

[0012] In some embodiments,

[0013] The spacing distance between the two reinforcing ribs respectively provided on the first side wall and the second side wall is L, where L=80±5 mm.

[0014] In some embodiments,

[0015] Projected on the outer wall surface of the first side wall, the reinforcing rib has an oblong shape.

[0016] In some embodiments,

[0017] The oblong shape includes a straight line segment in the middle and semicircular segments at both ends of the straight line segment. The cross section of the reinforcing rib corresponding to the straight line segment is semicircular.

[0018] In some embodiments,

[0019] An XOY coordinate system is established with the intersection of the first vertical wall, the first side wall and the fan duct shell as the coordinate origin O, the intersection line of the first vertical wall and the first side wall as the Y-axis, and the intersection line of the first side wall and the fan duct shell as the X-axis. The first symmetry line of the two reinforcing ribs on the first side wall is parallel to the Y-axis, and the spacing between the first symmetry line of the reinforcing rib close to the Y-axis and the Y-axis is S02, S02=70±5mm; and / or, the second symmetry line of the two reinforcing ribs on the first side wall is parallel to the X-axis, and the spacing between the second symmetry line of each of the two reinforcing ribs and the X-axis is S01, S01=120±10mm; and / or, the length of the straight segment of each reinforcing rib is S03, S03=130±10mm; and / or, the radius of the semicircular segment of each reinforcing rib is S04, S04=15±5mm.

[0020] In some embodiments, the thickness of the reinforcing rib is S05, where S05 = 3±2 mm.

[0021] The present invention also provides a method for designing a ram air valve reinforcement rib, comprising the following steps:

[0022] Construct simulation models of the ram air valve, heat exchanger, and air cycle machine in structural mechanics simulation software;

[0023] Determining the stress distribution of the ram air valve under the load of the heat exchanger through simulation;

[0024] According to the obtained stress distribution, two regions of the model with the largest stress are selected and recorded as region A and region B;

[0025] Adjust the spacing L between the two reinforcing ribs, obtain the model maximum stress value, model maximum displacement value, average maximum stress value of area A, and average maximum stress value of area B of the simulation model corresponding to different spacing Ls, and draw the corresponding change areas and display them in the same view;

[0026] The preferred value of the spacing L between the two reinforcing ribs is obtained according to the view.

[0027] The present invention also provides an aircraft air conditioner comprising the ram air valve.

[0028] The present invention provides a ram air valve, a ram air valve reinforcement rib design method, and an aircraft air conditioner, which have the following beneficial effects:

[0029] Unlike the prior art method of connecting reinforcing ribs on the outer wall of the heat exchanger air duct shell by glue riveting, the reinforcing ribs of the present invention are integrally formed on the first side wall and the second side wall. This eliminates the damage to the base material of the heat exchanger air duct shell caused by the setting of reinforcing ribs, prevents the delamination of the material, improves its ability to withstand the vertical load applied by the heat exchanger, etc., reduces the deformation displacement under the same load, and thus improves the service life of the component. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall still fall within the scope of the technical contents disclosed herein.

[0032] Figure 1 This is a schematic structural diagram of a ram air valve, a heat exchanger, and an air cycle unit in an assembled state according to an embodiment of the present invention;

[0033] Figure 2 Schematic diagram of the three-dimensional structure of the housing of the ram air valve according to an embodiment of the present invention (half);

[0034] Figure 3 for Figure 2 Front view of

[0035] Figure 4 for Figure 3 Cross-section of the middle EE;

[0036] Figure 5 This is a stress distribution cloud diagram of the outer shell of a ram air valve without reinforcement ribs in the prior art;

[0037] Figure 6 A stress distribution cloud diagram of the housing of a ram air valve provided with reinforcing ribs according to the present invention;

[0038] Figure 7 This is a nephogram of the deformation and displacement distribution of the housing of a ram air valve without reinforcement ribs in the prior art;

[0039] Figure 8 A nephogram showing the deformation and displacement distribution of the housing of a ram air valve provided with reinforcing ribs according to the present invention;

[0040] Figure 9 An indication of the maximum stress area after the ram air valve housing is assembled with the heat exchanger and the air cycle machine in the prior art;

[0041] Figure 10 This is a graphical view simultaneously displaying the maximum stress value of the model, the maximum displacement value of the model, the average maximum stress value of region A, and the average maximum stress value of region B in the ram air valve reinforcement rib design method according to an embodiment of the present invention.

[0042] The reference numerals indicate:

[0043] 10. Outer shell; 11. Heat exchanger air duct shell; 111. First vertical wall; 112. Second vertical wall; 113. First side wall; 12. Fan air duct shell; 2. Reinforcement ribs; 3. Inner shell; 31. Guide vanes; 32. One-way valve;

[0044] 100. Heat exchanger;

[0045] 200. Air circulator; 201. Fan. DETAILED DESCRIPTION

[0046] 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.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0049] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] See also Figure 1and Figure 10 As shown, according to an embodiment of the present invention, a ram air valve is provided, comprising: an outer shell 10, the outer shell 10 having a heat exchanger duct shell 11 that is connected to the hot side end face of the heat exchanger 100 and a fan duct shell 12 that is connected to the end face of the fan volute of the air cycle machine 200, the cross section of the fan duct shell 12 being circular; an inner shell 3 is mounted inside the outer shell 10, an annular flow channel is formed between the outer shell 10 and the inner shell 3, the annular flow channel is connected to the flow outlet of the heat exchanger duct shell 12, the inner shell 3 has a first airflow outlet that is concentric with a port on one side of the outer shell 10, the first airflow outlet is provided with a guide vane, the inner shell 3 also has a second airflow outlet that is away from the first airflow outlet, and is connected to the heat exchanger 100. The heated airflow can be guided by the heat exchanger duct housing 11 through the fan duct housing 12 to the air inlet of the fan volute of the air cycle machine 200, and driven by the fan 201 assembled in the fan volute, it is discharged from the air outlet of the fan volute to the aforementioned first airflow outlet, and then finally discharged through the second airflow outlet; the heat exchanger duct housing 11 includes a first vertical wall 111 and a second vertical wall 112 that are parallel to the radial plane of the fan duct housing 12 and spaced apart from each other, and the heat exchanger duct housing 11 also includes a first side wall 113 and a second side wall (not shown in the figure) connected between the first vertical wall 111 and the second vertical wall 112 and arranged in parallel and spaced apart, and the first side wall 113 and the second side wall are integrally formed with reinforcing ribs 2.

[0054] In this technical solution, unlike the prior art method of connecting reinforcing ribs on the outer wall surface of the heat exchanger air duct shell 11 by glue riveting, the reinforcing ribs 2 of the present invention are integrally formed on the first side wall 113 and the second side wall. This eliminates the damage to the base material of the heat exchanger air duct shell 11 caused by the setting of the reinforcing ribs 2, prevents the delamination of the material, improves its ability to withstand the vertical load applied by the heat exchanger 100, etc., reduces the deformation displacement under the same load, and thus improves the service life of the component.

[0055] In a preferred embodiment, the reinforcing ribs 2 are molded on the heat exchanger air duct shell 11. Specifically, the shell 10 is molded by glass fiber + epoxy resin, and the manufacturing process is simple.

[0056] The reinforcing ribs 2 protrude from the outer wall of the heat exchanger air duct housing 11 to prevent the inner bulge from increasing the resistance of the fluid in the ram air valve.

[0057] In a specific embodiment,

[0058] Two reinforcing ribs 2 are respectively provided on the first side wall 113 and the second side wall. The first side wall 113 has a symmetry plane parallel to the first vertical wall 111. The two reinforcing ribs 2 are symmetrical about the symmetry plane, and the length extension direction of each reinforcing rib 2 is parallel to the height extension direction of the first vertical wall 111.

[0059] In this technical solution, two reinforcing ribs 2 are provided on each of the first side wall 113 and the second side wall, respectively. This ensures that the corresponding side walls have a high structural strength (rigidity) without significantly increasing the overall mass, thereby facilitating the lightweight design of the ram air valve of the present invention. It should be noted that, in one specific embodiment, the housing 10 is comprised of two structurally symmetrical halves that are assembled together to form a single unit. That is, in actual production, the first side wall 113 and the second side wall are located on two different halves, but their structures are mirror-image symmetrical.

[0060] The inventors have found that the distance L between the two reinforcing ribs 2 respectively provided on the first side wall 113 and the second side wall will affect the maximum stress and deformation displacement of the entire housing 10. The inventors have found that when L = 80 ± 5 mm, see Figure 10 As shown in the figure, the L value has a minimum or smaller value for the maximum stress and maximum displacement in different areas. Taking into account the overall situation, when the L distance is 80±5mm, the ram air valve has lower stress concentration and structural deformation.

[0061] See also Figure 3 As shown, in some embodiments, the rib 2 is projected onto the outer wall surface of the first side wall 113 in an oblong shape. Ribs 2 with this shape have arc-shaped end surfaces, which are less likely to cause stress concentration and more easily disperse stress along the arc and arc surface. Specifically, the oblong shape includes a straight line segment in the middle and semicircular segments at both ends of the straight line segment. The cross-section of the rib 2 corresponding to the straight line segment is semicircular, which maximizes the stress-bearing area of ​​the rib 2 while effectively preventing stress concentration thereon.

[0062] See further Figure 3 As shown, in some embodiments,

[0063] An XOY coordinate system is established with the intersection of the first vertical wall 111, the first side wall 113, and the fan duct housing 12 as the coordinate origin O, the intersection line of the first vertical wall 111 and the first side wall 113 as the Y axis, and the intersection line of the first side wall 113 and the fan duct housing 12 as the X axis. The first symmetry lines of the two reinforcing ribs 2 on the first side wall 113 are parallel to the Y axis, and the distance between the first symmetry line of the reinforcing rib 2 close to the Y axis and the Y axis is S02, S02=70. ±5mm; and / or, the second symmetry lines of the two reinforcing ribs 2 on the first side wall 113 are parallel to the X-axis, and the spacing between the second symmetry lines of each of the two reinforcing ribs 2 and the X-axis is S01, S01=120±10mm; and / or, the length of the straight segment of each reinforcing rib 2 is S03, S03=130±10mm; and / or, the radius of the semicircular segment of each reinforcing rib 2 is S04, S04=15±5mm; the thickness of the reinforcing rib 2 is S05, S05=3±2mm.

[0064] The selection and design of the aforementioned dimensional parameters can minimize the use of materials while meeting the structural stiffness requirements, that is, the design of the reinforcing rib 2 of the present invention follows the principle of minimum mass.

[0065] Figure 5 and Figure 6 The stress distribution cloud diagrams of the structure without reinforcement ribs (i.e., the prior art) and the structure with reinforcement ribs (i.e., the technical solution of the present invention) are shown in FIG. The total load is applied to the hot side outlet of the heat exchanger, i.e., the load surface. The structure without reinforcement ribs has a maximum stress concentration value of 116.639 MPa at the hot side outlet of the heat exchanger. Figure 5 As shown in Figure 2, under the same loading condition, the rib structure also has a maximum stress concentration value of 110.400 MPa at the hot side outlet of the heat exchanger, as shown in Figure 2. Figure 6 As shown; Figure 7 and Figure 8 Displacement distribution cloud plots for the rib-free and rib-equipped structures are shown. The rib-free structure exhibits a maximum displacement of 0.824mm at the hot edge outlet of the heat exchanger, while the rib-equipped structure exhibits a maximum displacement of 0.768mm. This demonstrates that the rib design employed in the aforementioned technical solution effectively improves the stress response of the ram air valve and reduces deformation under additional load.

[0066] According to an embodiment of the present invention, a method for designing a ram air valve reinforcement rib is also provided, comprising the following steps:

[0067] A simulation model of the ram air valve, the heat exchanger 100, and the air cycle machine 200 is constructed in a structural mechanics simulation software. The structural mechanics simulation software may be conventional finite element analysis software such as Ansys or Comsol xxxx.

[0068] The stress distribution of the ram air valve under the load of the heat exchanger 100 is obtained through simulation;

[0069] According to the stress distribution obtained, the two areas where the model is subjected to the greatest stress are selected and recorded as area A and area B, as shown in FIG. Figure 9 As shown;

[0070] Adjust the spacing L between the two reinforcing ribs 2, obtain the model maximum stress value, model maximum displacement value, average maximum stress value of area A and average maximum stress value of area B of the simulation model corresponding to different spacing L, and draw the corresponding change areas and display them in the same view at the same time, as shown in Figure 2. Figure 10 As shown;

[0071] The preferred value of the spacing L between the two reinforcing ribs 2 is obtained according to the view.

[0072] This design solution can take into account the spacing L between the two reinforcing ribs 2 and provide a minimum or smaller value for the maximum stress and maximum displacement in different areas, ultimately ensuring that the ram air valve has lower stress concentration and structural deformation.

[0073] like Figure 9 As shown in the figure, the two areas with the largest force on the model are divided into area A and area B. Figure 10 The figure shows that the model's maximum stress and displacement both reach their minimums when the rib spacing L ranges from 40 to 210 mm. The average maximum stress in region A reaches a clear inflection point at L = 80 mm, where the stress is at its minimum. The average maximum stress in region B reaches its minimum stress and displacement at 70 mm. Therefore, considering all factors, a rib spacing of 80 mm is optimal for reducing stress concentration and deformation in thin-walled parts such as ram air valves.

[0074] According to an embodiment of the present invention, there is also provided an aircraft air conditioner comprising the aforementioned ram air valve.

[0075] The above description is merely a preferred embodiment of the present invention and is 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 description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can 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 ram air valve, characterized in that: include: A housing (10), the housing (10) comprising a heat exchanger air duct housing (11) cooperatively connected to a hot-side end face of the heat exchanger (100) and a fan air duct housing (12) cooperatively connected to an end face of a fan volute of an air cycle machine (200), wherein the cross section of the fan air duct housing (12) is circular; The heat exchanger air duct housing (11) comprises a first vertical wall (111) and a second vertical wall (112) which are parallel to the radial plane of the fan air duct housing (12) and spaced apart from each other. The heat exchanger air duct housing (11) further comprises a first side wall (113) and a second side wall which are connected between the first vertical wall (111) and the second vertical wall (112) and are arranged in parallel and spaced apart from each other. The first side wall (113) and the second side wall are integrally formed with reinforcing ribs (2).

2. The ram air valve according to claim 1, wherein: The reinforcing rib (2) is molded on the heat exchanger air duct shell (11); and / or the reinforcing rib (2) protrudes from the outer wall surface of the heat exchanger air duct shell (11).

3. The ram air valve according to claim 1, wherein: Two reinforcing ribs (2) are respectively provided on the first side wall (113) and the second side wall; the first side wall (113) has a symmetry plane parallel to the first vertical wall (111); the two reinforcing ribs (2) are symmetrical about the symmetry plane, and the length extension direction of each reinforcing rib (2) is parallel to the height extension direction of the first vertical wall (111).

4. The ram air valve according to claim 3, wherein: The spacing distance between the two reinforcing ribs (2) respectively provided on the first side wall (113) and the second side wall is L, where L=80±5 mm.

5. The ram air valve according to claim 3, wherein: Projected onto the outer wall surface of the first side wall (113), the reinforcing rib (2) is in the shape of an oblong.

6. The ram air valve according to claim 5, wherein: The oblong shape includes a straight line segment in the middle and semicircular segments at both ends of the straight line segment, and the cross section of the reinforcing rib (2) corresponding to the straight line segment is semicircular.

7. The ram air valve according to claim 6, wherein: An XOY coordinate system is established with the intersection of the first vertical wall (111), the first side wall (113) and the fan duct shell (12) as the coordinate origin O, the intersection line of the first vertical wall (111) and the first side wall (113) as the Y axis, and the intersection line of the first side wall (113) and the fan duct shell (12) as the X axis. The first symmetry lines of the two reinforcing ribs (2) on the first side wall (113) are parallel to the Y axis, and the first symmetry line of the reinforcing rib (2) close to the Y axis is parallel to the Y axis. The spacing between the axes is S02, S02 = 70 ± 5 mm; and / or, the second symmetry lines of the two reinforcing ribs (2) on the first side wall (113) are parallel to the X-axis, and the spacing between the second symmetry lines of each of the two reinforcing ribs (2) and the X-axis is S01, S01 = 120 ± 10 mm; and / or, the length of the straight segment of each reinforcing rib (2) is S03, S03 = 130 ± 10 mm; and / or, the radius of the semicircular segment of each reinforcing rib (2) is S04, S04 = 15 ± 5 mm.

8. The ram air valve according to claim 6, wherein: The thickness of the reinforcing rib (2) is S05, S05 = 3 ± 2 mm.

9. A method for designing a ram air valve reinforcement rib, characterized in that: The steps include: Constructing a simulation model of the ram air valve, the heat exchanger (100), and the air cycle machine (200) according to any one of claims 3 to 8 in structural mechanics simulation software; Determining the stress distribution of the ram air valve under the load of the heat exchanger (100) through simulation; According to the obtained stress distribution, two regions of the model with the largest stress are selected and recorded as region A and region B; Adjust the spacing L between the two reinforcing ribs (2), obtain the model maximum stress value, model maximum displacement value, average maximum stress value of region A, and average maximum stress value of region B of the simulation model corresponding to different spacing Ls, and draw the corresponding change areas and display them in the same view at the same time; The preferred value of the spacing L between the two reinforcing ribs (2) is obtained according to the view.

10. An aircraft air conditioner, characterized in that: A ram air valve comprising the ram air valve according to any one of claims 1 to 8.

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