Full height foam sandwich flap structure

Abstract

The utility model belongs to the technical field of aircraft structure design, disclose a kind of full height foam sandwich flap structure. Specifically including upper wallboard, lower wallboard, foam core and two end structures, upper wallboard one end lap joint is fixed in lower wallboard one end, lower wallboard other end lap joint is fixed in upper wallboard other end, and end structure is fixed between upper wallboard and lower wallboard, and upper wallboard, lower wallboard and two end structures are enclosed to form accommodating space, and the side of upper wallboard and lower wallboard each other close is connected with foam core, and foam core fills accommodating space. Compared with traditional double-beam flap structure, the full height foam sandwich flap structure uses less parts, without multiple parts butt joint assembly, and the assembly difficulty is lower;Compared with traditional upper and lower surface integrated forming, the full height foam sandwich flap structure is fixed by upper and lower wallboard split type lap joint, so it is not necessary to use mold process and repeated modification, can be realized by secondary cementation or mechanical connection, effectively reduce the processing difficulty and production cost.

Description

Technical Field

[0001] This utility model relates to the field of aircraft structural design technology, and in particular to a full-height foam sandwich flap structure. Background Technology

[0002] Wing design is the core of aircraft design, and it requires comprehensive consideration of factors such as aerodynamic performance and structural strength. Typical wing designs include double-spar flaps and full-height foam core flaps.

[0003] In existing technologies, the double-beam flap structure mainly consists of a leading edge, a box section, and a trailing edge, and uses two main beams and wing ribs to form a skeleton. It has high structural strength, but has many parts, is difficult to process, and is difficult to assemble. The full-height foam core flap is molded as a single piece with the upper and lower wing surfaces, and the entire flap is filled with foam core. During processing, a mold-closing process with rigid molds on both the upper and lower surfaces is required to ensure the complex shape of the flap. The molding pressure of this mold-closing process is only borne by the rigid mold and is difficult to transmit to the cavity. The rigid mold needs to be repeatedly modified to ensure the molding quality, which greatly increases the processing difficulty and production cost.

[0004] Therefore, there is an urgent need to provide a full-height foam sandwich flap structure to reduce assembly difficulty and processing costs, which can achieve fewer parts and lower assembly difficulty, and eliminate the need for mold closing process and repeated shaping. Utility Model Content

[0005] The purpose of this invention is to provide a full-height foam sandwich flap structure to reduce assembly difficulty and processing costs. It can achieve fewer parts and lower assembly difficulty, and does not require mold closing process and repeated shaping.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a full-height foam sandwich flap structure, including an upper wall panel, a lower wall panel, a foam core, and two end structures. One end of the upper wall panel is overlapped and fixed to one end of the lower wall panel, and the other end of the lower wall panel is overlapped and fixed to the other end of the upper wall panel. The end structures are fixed between the upper wall panel and the lower wall panel. The upper wall panel, the lower wall panel, and the two end structures enclose a receiving space. The sides of the upper wall panel and the lower wall panel that are close to each other are connected to the foam core, and the foam core fills the receiving space.

[0008] As an optional technical solution for a full-height foam sandwich flap structure, it also includes reinforcing ribs. The reinforcing ribs are fixed on the side of the upper wall panel near the foam core, and the reinforcing ribs are fixed on the side of the lower wall panel near the foam core. One side of the foam core is fixed to the upper wall panel and the corresponding reinforcing rib, and the other side of the foam core is fixed to the lower wall panel and the corresponding reinforcing rib.

[0009] As an optional technical solution for a full-height foam sandwich flap structure, the upper wall panel and / or the lower wall panel are provided with a plurality of reinforcing ribs spaced apart along their own length direction;

[0010] And / or, the foam core, the reinforcing ribs, and the corresponding upper or lower wall panels are all glued together.

[0011] As an optional technical solution for a full-height foam sandwich flap structure, it also includes a first fastener, which is used to fix the upper wall panel and the lower wall panel at the overlapping position.

[0012] As an optional technical solution for a full-height foam sandwich flap structure, the end structure includes end ribs and plugs, both of which are fixed between the upper wall panel and the lower wall panel and cooperate to form the receiving space.

[0013] As an optional technical solution for a full-height foam sandwich flap structure, it also includes a second fastener, wherein the end rib is fixed to the upper wall panel and the lower wall panel by the second fastener.

[0014] As an optional technical solution for a full-height foam sandwich flap structure, the plug is glued and fixed to the upper wall panel and the lower wall panel.

[0015] As an optional technical solution for a full-height foam sandwich flap structure, a gap is left between the end rib and the plug.

[0016] As an optional technical solution for a full-height foam sandwich flap structure, it also includes a first connector, which is detachably fixed to the side of the lower wall panel away from the foam core for connecting a rocker arm.

[0017] As an optional technical solution for a full-height foam sandwich flap structure, it also includes a second connector, which is detachably fixed to the side of the lower wall panel away from the foam core, for connecting the drive arm.

[0018] Beneficial effects:

[0019] This utility model provides a full-height foam sandwich flap structure, which includes an upper wall panel, a lower wall panel, a foam core, and two end structures. One end of the upper wall panel is overlapped and fixed to one end of the lower wall panel, and the other end of the lower wall panel is overlapped and fixed to the other end of the upper wall panel. The end structures are fixed between the upper wall panel and the lower wall panel. The upper wall panel, the lower wall panel, and the two end structures enclose a receiving space. The sides of the upper wall panel and the lower wall panel that are close to each other are connected to the foam core, and the foam core fills the receiving space. The upper and lower wall panels are fixed by overlapping at the ends. The upper and lower wall panels, together with the end structure, form an accommodating space. The sides of the upper and lower wall panels that are close to each other are connected to the foam core to fill the accommodating space. Compared with the traditional double-beam flap structure, this full-height foam sandwich flap structure uses fewer parts, has a simpler structure, does not require the docking of multiple parts, and has lower assembly difficulty. Compared with the traditional foam core flap with one-piece molding of the upper and lower wing surfaces, this full-height foam sandwich flap structure uses separate overlapping and fixing of the upper and lower wall panels. Therefore, there is no need to use mold-closing process and repeated shaping. It can be achieved through secondary gluing or mechanical connection, which effectively reduces the processing difficulty and production cost. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the full-height foam sandwich flap structure, drive arm, rocker arm, and support arm provided in this embodiment of the utility model.

[0021] Figure 2 This is a first-view structural schematic diagram of the full-height foam sandwich flap structure provided in this embodiment of the utility model;

[0022] Figure 3 This is a second-view structural schematic diagram of the full-height foam sandwich flap structure provided in this embodiment of the utility model;

[0023] Figure 4 This is a third-view structural schematic diagram of the full-height foam sandwich flap structure provided in this embodiment of the utility model;

[0024] Figure 5 yes Figure 4 Sectional view at AA;

[0025] Figure 6 yes Figure 4 Sectional view at BB;

[0026] Figure 7 This is an internal view of the full-height foam sandwich flap structure provided in this embodiment of the utility model.

[0027] In the picture:

[0028] 1. Upper wall panel; 2. Lower wall panel; 3. First joint; 4. Second joint; 5. End structure; 51. End rib; 51a. Outer end rib; 511. Fixing hole; 52. Block; 6. Foam core; 7. Reinforcing rib;

[0029] 8. Rocker arm; 9. Support arm; 10. Drive arm. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] like Figures 1 to 6As shown, this embodiment provides a full-height foam sandwich flap structure, which includes an upper wall panel 1, a lower wall panel 2, a foam core 6, and two end structures 5. One end of the upper wall panel 1 is overlapped and fixed to one end of the lower wall panel 2, and the other end of the lower wall panel 2 is overlapped and fixed to the other end of the upper wall panel 1. The end structures 5 are fixed between the upper wall panel 1 and the lower wall panel 2. The upper wall panel 1, the lower wall panel 2, and the two end structures 5 enclose a receiving space. The sides of the upper wall panel 1 and the lower wall panel 2 that are close to each other are connected to the foam core 6, and the foam core 6 fills the receiving space.

[0035] Among them, the full-height foam sandwich flap structure is an aircraft flap design that uses foam core 6. Its "full height" means that the foam core 6 inside completely fills the entire flap in the thickness direction of the flap, thereby forming an uninterrupted continuous support layer from the upper wall panel 1 to the lower wall panel 2.

[0036] The upper wall panel 1 and lower wall panel 2 are fixed by overlapping at the ends. The upper wall panel 1 and lower wall panel 2, together with the end structure 5, form an accommodating space. The sides of the upper wall panel 1 and lower wall panel 2 that are close to each other are connected to the foam core 6 to fill the accommodating space. Compared with the traditional double-beam flap structure, this full-height foam sandwich flap structure uses fewer parts, has a simpler structure, does not require multiple parts to be assembled, and has a lower assembly difficulty. Compared with the traditional foam core flap with the upper and lower wing surfaces molded as one piece, this full-height foam sandwich flap structure uses the upper wall panel 1 and lower wall panel 2 to be fixed by overlapping separately. Therefore, there is no need to use the mold-closing process and repeated shaping. It can be achieved by secondary gluing or mechanical connection, which effectively reduces the processing difficulty and production cost.

[0037] See Figure 2 and Figure 7 The full-height foam sandwich flap structure also includes reinforcing ribs 7. The upper wall panel 1 is fixed with reinforcing ribs 7 on the side near the foam core 6, and the lower wall panel 2 is fixed with reinforcing ribs 7 on the side near the foam core 6. One side of the foam core 6 is fixed to the upper wall panel 1 and the corresponding reinforcing ribs 7, and the other side of the foam core 6 is fixed to the lower wall panel 2 and the corresponding reinforcing ribs 7.

[0038] Reinforcing ribs 7 are fixed on the side of the upper wall panel 1 and the lower wall panel 2 near the foam core 6. The two sides of the foam core 6 are fixed to the upper and lower wall panels and the corresponding reinforcing ribs 7 respectively. The reinforcing ribs 7 can improve the local load-bearing capacity, ensure the shape of the full-height foam sandwich flap structure, suppress buckling deformation of the wall panel under pressure, enhance structural stability, and also disperse the load to optimize the load distribution.

[0039] Optionally, the upper wall panel 1 and / or the lower wall panel 2 are provided with multiple reinforcing ribs 7 at intervals along their length. The multiple reinforcing ribs 7 arranged at intervals along the length direction, compared with continuous arrangement, can reduce the structural weight while ensuring load-bearing capacity.

[0040] Optionally, the foam core 6, reinforcing ribs 7, and the corresponding upper wall panel 1 or lower wall panel 2 are all bonded together. Using adhesive bonding reduces the drilling and sealing required for mechanical connections. The adhesive layer can evenly distribute the load, reducing stress concentration, and is particularly suitable for load transfer between the foam core 6 and the upper and lower wall panels and corresponding reinforcing ribs 7, thus helping to improve bending strength.

[0041] Optionally, the full-height foam sandwich flap structure also includes a first fastener, which secures the upper wall panel 1 and the lower wall panel 2 at their overlap. The upper wall panel 1 and the lower wall panel 2 can be fabricated separately, and then fixed at their overlap by the first fastener during assembly. This method is low-cost and has a high tolerance for error, and can locally enhance the load-bearing capacity of the overlap area. The upper wall panel 1, the lower wall panel 2, and the fastener work together to form a stress-bearing system, improving the overall bending strength.

[0042] See Figure 2 and Figure 3 The end structure 5 includes end ribs 51 and blocking blocks 52, both of which are fixed between the upper wall panel 1 and the lower wall panel 2, and cooperate to form an accommodating space. Compared with using a single end rib for sealing, using end ribs 51 and blocking blocks 52 in synergy to achieve end sealing can suppress end warping deformation caused by flight loads, prevent uncontrollable thickness changes caused by creep of the foam core 6, and disperse end stress concentration.

[0043] Optionally, the full-height foam sandwich flap structure also includes a second fastener, with the end rib 51 fixed to the upper wall panel 1 and the lower wall panel 2 by the second fastener; and the plug 52 glued to the upper wall panel 1 and the lower wall panel 2.

[0044] The end rib 51, as the main load-bearing component, is fixed by a second fastener. The high toughness of the foam core 6 and the bolt-fixed end rib 51 work together to disperse instantaneous loads during flight and prevent structural breakage. In this embodiment, the end rib 51 includes a sealing plate and two fixing plates. The top and bottom ends of the sealing plate are each connected to a fixing plate. The two fixing plates are parallel and spaced apart, and the plane of the fixing plates is perpendicular to the plane of the sealing plate. The fixing plates are provided with multiple fixing holes 511 for the second fastener to pass through.

[0045] The plug 52 serves as an auxiliary sealing structure. It is fixed by adhesive bonding to form an adhesive layer, which can evenly distribute local stress, reduce structural gaps, eliminate the need for drilling and other processing, and avoid potential defects such as hole edge cracks.

[0046] In this embodiment, a gap is left between the end rib 51 and the plug 52. The end rib 51 and the plug 52 cooperate to seal the end. By leaving a gap between the end rib 51 and the plug 52, slight displacement is allowed when subjected to load. The gap can also provide buffer space for the expansion and deformation of the foam core 6 and compensate for processing errors, etc.

[0047] In this embodiment, the two end structures 5 are spaced apart and arranged opposite to each other, and the two end structures 5 have different structures; the end ribs 51 include an outer end rib 51a and an inner end rib, the first end structure 5 includes an outer end rib 51a and two blocking blocks 52, and the second end structure 5 includes an inner end rib and a blocking block 52. From the perspective of structural strength, the outer end rib 51a usually bears a larger aerodynamic load, and the design of double blocking blocks 52 can enhance the local shear resistance, while the inner end rib can be simplified by using only one blocking block 52 to meet the strength requirements.

[0048] See Figure 1 , Figure 4 and Figure 5 The full-height foam sandwich flap structure also includes a first connector 3, which is detachably fixed to the side of the lower wall plate 2 away from the foam core 6 for connecting the rocker arm 8; it also includes a second connector 4, which is detachably fixed to the side of the lower wall plate 2 away from the foam core 6 for connecting the drive arm 10.

[0049] The rocker arm 8 and drive arm 10 are key components of the flap transmission structure. As part of a linkage mechanism, the rocker arm 8 and support arm 9 enable linear or deflection movements of the flap, while the drive arm 10 is used to push the flap to deploy or retract. A detachable first connector 3 and second connector 4 are provided on the flap structure. The rocker arm 8 and drive arm 10 are connected to the lower wall plate 2 via the first connector 3 and the second connector 4, respectively. This allows the load to be distributed to different force transmission paths, and the separate connectors facilitate individual replacement and maintenance.

[0050] In this embodiment, along the length direction of the full-height foam sandwich flap structure (i.e., the length direction of the upper wall panel 1 or the lower wall panel 2), there are two first connectors 3 spaced apart, and one second connector 4 located between the two first connectors 3; both the first connector 3 and the second connector 4 are fixed to the lower wall panel 2 by a third fastener; the first connector 3 is plate-shaped, with one side of the first connector 3 attached to the lower wall panel 2, and the other side of the first connector 3 has a slot for the rocker arm 8 to be inserted; the second connector 4 includes a base plate and an arm connected to the base plate; the first fastener, the second fastener, and the third fastener include, but are not limited to, screws.

[0051] The following is the specific assembly process for the full-height foam sandwich flap structure:

[0052] After processing the upper wall panel 1, lower wall panel 2, reinforcing rib 7, end rib 51, and plug 52, the above parts are assembled and bonded a second time. Secondary bonding is a common composite material joining process. Its core feature is that pre-cured components are then assembled using adhesives. That is, the above parts are first cured individually and then bonded together a second time using adhesives.

[0053] After the secondary bonding is completed, the upper wall panel 1 and the lower wall panel 2, the upper wall panel 1 and the outer end rib 51a and the inner end rib, and the lower wall panel 2 and the outer end rib 51a and the inner end rib are connected with fasteners. Then, the first joint 3 and the second joint 4 are installed to the lower wall panel 2 with fasteners. Finally, the entire full-height foam sandwich flap structure is connected to the wing box through the support arm 9, the rocker arm 8 and the drive arm 10. The wing box serves as the core load-bearing structure. The actuator of the flap retraction system is connected to the drive arm 10. The actuator is driven by a motor or electric mechanism to control the flap structure to achieve retraction and extension.

[0054] The full-height foam sandwich flap structure provided in this embodiment has fewer parts, lighter overall weight, and simple structure. It uses secondary adhesive bonding with a small number of fasteners for connection, resulting in good connection strength and lower processing and assembly difficulty, which helps to save processing and manufacturing costs.

[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A full-height foam sandwich flap structure, characterized in that, It includes an upper wall panel (1), a lower wall panel (2), a foam core (6), and two end structures (5). One end of the upper wall panel (1) is overlapped and fixed to one end of the lower wall panel (2), and the other end of the lower wall panel (2) is overlapped and fixed to the other end of the upper wall panel (1). The end structures (5) are fixed between the upper wall panel (1) and the lower wall panel (2). The upper wall panel (1), the lower wall panel (2), and the two end structures (5) enclose a receiving space. The sides of the upper wall panel (1) and the lower wall panel (2) that are close to each other are connected to the foam core (6). The foam core (6) fills the receiving space.

2. The full-height foam sandwich flap structure according to claim 1, characterized in that, It also includes reinforcing ribs (7), the upper wall panel (1) is fixed with the reinforcing ribs (7) on the side near the foam core (6), the lower wall panel (2) is fixed with the reinforcing ribs (7) on the side near the foam core (6), one side of the foam core (6) is fixed to the upper wall panel (1) and the corresponding reinforcing ribs (7), and the other side of the foam core (6) is fixed to the lower wall panel (2) and the corresponding reinforcing ribs (7).

3. The full-height foam sandwich flap structure according to claim 2, characterized in that, The upper wall panel (1) and / or the lower wall panel (2) are provided with a plurality of reinforcing ribs (7) at intervals along their own length direction. And / or, the foam core (6), the reinforcing rib (7) and the corresponding upper wall panel (1) or lower wall panel (2) are all glued together.

4. The full-height foam sandwich flap structure according to claim 1, characterized in that, It also includes a first fastener, which is used to fix the upper wall panel (1) and the lower wall panel (2) at the overlapping position.

5. The full-height foam sandwich flap structure according to claim 1, characterized in that, The end structure (5) includes an end rib (51) and a block (52), both of which are fixed between the upper wall plate (1) and the lower wall plate (2) and together form the accommodating space.

6. The full-height foam sandwich flap structure according to claim 5, characterized in that, It also includes a second fastener, the end rib (51) being fixed to the upper wall plate (1) and the lower wall plate (2) by the second fastener.

7. The full-height foam sandwich flap structure according to claim 5, characterized in that, The block (52) is glued and fixed to the upper wall panel (1) and the lower wall panel (2).

8. The full-height foam sandwich flap structure according to claim 5, characterized in that, A gap is left between the end rib (51) and the block (52).

9. The full-height foam sandwich flap structure according to any one of claims 1-8, characterized in that, It also includes a first connector (3), which is detachably fixed to the side of the lower wall plate (2) away from the foam core (6) for connecting the rocker arm (8).

10. The full-height foam sandwich flap structure according to any one of claims 1-8, characterized in that, It also includes a second connector (4), which is detachably fixed to the side of the lower wall plate (2) away from the foam core (6) for connecting the drive arm (10).

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