Honeycomb coralline interlayer thermal protection structure based on composite material

Abstract

The invention discloses a honeycomb coralline interlayer thermal protection structure based on a composite material. The honeycomb coralline interlayer thermal protection structure comprises a composite material first panel layer; a second composite panel layer; the double-layer honeycomb coralline interlayer is arranged between the composite material first panel layer and the composite material second panel layer, the double-layer honeycomb coralline interlayer comprises an upper honeycomb coral layer and a lower honeycomb coral layer, and the lower honeycomb coral layer comprises a plurality of lower hexagonal prism frames arrayed on the top surface of the composite material second panel layer; the plurality of lower hexagonal prism frames are arranged in a honeycomb structure, the upper honeycomb coral layer comprises a plurality of upper hexagonal prism frames with different proportions or different stacking modes, and the plurality of upper hexagonal prism frames are arranged between the composite material first panel layer and the lower hexagonal prism frames in a honeycomb shape; wherein the upper hexagonal prism frame and the lower hexagonal prism frame are respectively and fixedly connected with a fixing frame. Stress can be effectively dispersed, stress concentration is avoided, and therefore the bearing capacity of the structure is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal protection, and in particular to a honeycomb coral-shaped sandwich thermal protection structure based on composite materials. Background Art

[0002] With the development of aerospace, military, energy and other fields, the demand for thermal protection technology is increasing. Especially under high temperature and high-speed flight conditions, thermal protection systems are essential to protect the structure of aircraft and maintain the normal operation of equipment. Therefore, the research and development of efficient and lightweight thermal protection technology has become a hot topic in the industry.

[0003] Composite materials are widely used in the field of thermal protection due to their excellent properties such as light weight, high strength, corrosion resistance, and high temperature resistance. Compared with traditional metal materials, composite materials can provide more effective thermal protection effects, while reducing structural weight and improving the overall performance of aircraft. Although existing thermal protection technology has made certain progress, there are still some limitations. For example, traditional thermal protection materials may have problems such as heavy weight, low thermal protection efficiency, and short service life. In addition, with the increase in flight speed and the complexity of the flight environment, the requirements for thermal protection systems are also getting higher and higher.

[0004] The patent document with application publication number CN118180533A involves this application, which involves a metal honeycomb-double-layer active cooling composite thermal protection structure and a manufacturing method, wherein the manufacturing method of the metal honeycomb-double-layer active cooling composite thermal protection structure includes: using metal materials to respectively make an outer skin, an inner skin, a honeycomb core, a plurality of hot surface cooling channels and a plurality of cold surface cooling channels, and fixing the brazing material; processing a plurality of side-by-side grooves at both ends of the honeycomb core, placing the hot surface cooling channels in the grooves at one end, and placing the cold surface cooling channels in the grooves at the other end; assembling the outer skin and the inner skin with the honeycomb core, placing the assembled specimen in a vacuum brazing furnace for vacuum brazing, and obtaining a metal honeycomb-double-layer active cooling composite thermal protection structure. This application can significantly reduce the weight and volume of the thermal protection structure and improve the selectivity of the thermal protection structure material. However, the processing cost of the metal honeycomb structure is high, the processing process is complicated, and the weight is large.

[0005] The patent document with application publication number CN102840423A discloses a heat-insulating and heat-insulating double-layer honeycomb panel, including two layers of honeycomb panels, wherein the honeycomb panel is composed of a plurality of closed hexagonal honeycomb cavities, a partition is arranged between the two layers of honeycomb panels, and a panel is arranged on the upper and lower surfaces of the two layers of honeycomb panels. The characteristics of the present invention are: it has strong heat-insulating and heat-insulating performance, which is achieved through a double-layer honeycomb structure and a double-layer closed hexagonal cavity. Although the single-layer honeycomb structure already has heat-insulating and heat-insulating properties, the double-layer honeycomb structure will further improve the heat-insulating and heat-insulating performance by more than 70%; the double-layer honeycomb panel has two layers of closed hexagonal honeycomb cavities, so the heat conduction efficiency is extremely low, and a heat-insulating bridge is formed between the polymer honeycomb in the middle layer and the panel, so that the heat transfer coefficient K value of the double-layer honeycomb panel material is as low as 0.65W / (m 2 .K), achieving excellent thermal insulation and heat insulation performance; after adopting the double-layer honeycomb structure, the rigidity and strength of the honeycomb panel are greatly improved, which is easy to promote. Compared with the gradient double-layer honeycomb structure, the single double-layer honeycomb structure is relatively single in function and cannot meet the requirements of stability, impact resistance, heat insulation, bearing capacity, etc. at the same time. This limits its applicability in complex application scenarios.

[0006] The patent document with application publication number CN118386612A relates to a multi-layer honeycomb structure polycarbonate hollow board, which relates to the technical field of building materials; it comprises a multi-layer honeycomb board body; the multi-layer honeycomb board body is composed of a multi-layer honeycomb structure layer, an upper board body, and a lower board body, and a multi-layer honeycomb structure layer is arranged between the upper board body and the lower board body; the multi-layer honeycomb structure layer is provided with a plurality of sound insulation and heat insulation holes. The utility model enhances the sound insulation, heat insulation, tensile strength and other effects of the polycarbonate hollow board, and improves the service life of the polycarbonate hollow board, and saves material costs, is safe and environmentally friendly, and has a beautiful appearance. However, the multi-layer honeycomb layer design is not a gradient structure and cannot absorb and disperse impact force more effectively, which affects the impact resistance of the material.

[0007] Based on the above technical problems, the present invention provides a honeycomb coral-shaped sandwich thermal protection structure based on composite materials. Summary of the invention

[0008] The purpose of the present invention is to provide a honeycomb coral-shaped sandwich thermal protection structure based on composite materials to solve the problems existing in the prior art.

[0009] To achieve the above object, the present invention provides the following solution: The present invention provides a honeycomb coral-shaped sandwich thermal protection structure based on composite materials, comprising:

[0010] a composite first panel layer;

[0011] A composite material second panel layer, wherein the composite material second panel layer is arranged opposite to the composite material first panel layer;

[0012] A double-layer honeycomb coral-shaped interlayer, the double-layer honeycomb coral-shaped interlayer is arranged between the first composite panel layer and the second composite panel layer, the double-layer honeycomb coral-shaped interlayer includes an upper honeycomb coral layer and a lower honeycomb coral layer, the lower honeycomb coral layer includes a plurality of lower hexagonal prism frames arrayed on the top surface of the second composite panel layer, the plurality of lower hexagonal prism frames are arranged in a honeycomb structure, the upper honeycomb coral layer includes a plurality of upper hexagonal prism frames of different sizes or different stacking methods, the plurality of upper hexagonal prism frames are arranged in a honeycomb shape between the first composite panel layer and the lower hexagonal prism frame;

[0013] Wherein, the upper hexagonal prism frame and the lower hexagonal prism frame are respectively fixedly connected with a fixing frame.

[0014] According to the composite material-based honeycomb coral-like interlayer thermal protection structure provided by the present invention, the cross-sectional area and the gap ratio of the double-layer honeycomb coral-like interlayer gradually increase in the direction away from the first surface layer.

[0015] According to the honeycomb coral-shaped sandwich thermal protection structure based on composite materials provided by the present invention, the wall thickness of the fixing frame fixed to the lower hexagonal prism frame is greater than the wall thickness of the fixing frame fixed to the upper hexagonal prism frame.

[0016] According to the honeycomb coral-shaped sandwich thermal protection structure based on composite materials provided by the present invention, the height of the lower hexagonal prism frame is greater than the height of the upper hexagonal prism frame.

[0017] According to the honeycomb coral-shaped sandwich thermal protection structure based on composite materials provided by the present invention, the diameter of the rods of the lower hexagonal prism frame is greater than the diameter of the rods of the upper hexagonal prism frame.

[0018] According to the honeycomb coral-shaped sandwich thermal protection structure based on composite materials provided by the present invention, the diameter of the rod of the upper hexagonal prism frame and the diameter of the rod of the lower hexagonal prism frame are both greater than the diameter of the fixed frame.

[0019] According to the honeycomb coral-shaped sandwich thermal protection structure based on composite materials provided by the present invention, polyimide adhesive is used to bond adjacent upper hexagonal prism frames, adjacent lower hexagonal prism frames, and the upper hexagonal prism frames and the lower hexagonal prism frames.

[0020] The present invention discloses the following technical effects:

[0021] The present invention discloses a honeycomb coral-shaped interlayer thermal protection structure design based on composite materials. The honeycomb coral-shaped interlayer is a double-layer structure with better stability and impact resistance. The honeycomb cross-sectional area and the gap ratio change in a gradient along a specified direction, which can effectively disperse stress and avoid stress concentration, thereby improving the bearing capacity of the structure. There are a large number of air gaps inside the hexagonal prism structure containing a fixed frame, which is conducive to blocking the transfer of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic structural diagram of a honeycomb coral-shaped sandwich thermal protection structure based on a composite material of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of Example 3 of the present invention.

[0027] Among them, 1. lower honeycomb coral layer; 2. fixing frame; 3. upper honeycomb coral layer; 4. first panel layer of composite material; 5. second panel layer of composite material. DETAILED DESCRIPTION

[0028] 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, not all of the embodiments. 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.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figure 1 The present invention provides a honeycomb coral-shaped sandwich thermal protection structure based on composite materials, comprising:

[0031] A composite material first panel layer 4;

[0032] A composite material second panel layer 5, the composite material second panel layer 5 and the composite material first panel layer 4 are arranged opposite to each other;

[0033] A double-layer honeycomb coral-shaped interlayer is arranged between the first composite panel layer 4 and the second composite panel layer 5, and the double-layer honeycomb coral-shaped interlayer includes an upper honeycomb coral layer 3 and a lower honeycomb coral layer 1, and the lower honeycomb coral layer 1 includes a plurality of lower hexagonal prism frames arrayed on the top surface of the second composite panel layer 5, and the plurality of lower hexagonal prism frames are arranged in a honeycomb structure, and the upper honeycomb coral layer 3 includes a plurality of upper hexagonal prism frames of different sizes or different stacking methods, and the plurality of upper hexagonal prism frames are arranged in a honeycomb shape between the first composite panel layer 4 and the lower hexagonal prism frame;

[0034] The upper hexagonal frame and the lower hexagonal frame are respectively fixedly connected with a fixing frame 2.

[0035] The solution is further optimized, and the cross-sectional area and the gap ratio of the double-layer honeycomb coral-shaped interlayer gradually increase in the direction away from the first surface layer.

[0036] According to a further optimization scheme, the wall thickness of the fixing frame 2 fixed to the lower hexagonal frame is greater than the wall thickness of the fixing frame 2 fixed to the upper hexagonal frame.

[0037] According to a further optimization scheme, the height of the lower hexagonal prism frame is greater than the height of the upper hexagonal prism frame.

[0038] According to a further optimization scheme, the diameter of the rods of the lower hexagonal prism frame is greater than the diameter of the rods of the upper hexagonal prism frame.

[0039] According to a further optimization scheme, the diameter of the rod of the upper hexagonal prism frame and the diameter of the rod of the lower hexagonal prism frame are both greater than the diameter of the fixing frame 2 .

[0040] To further optimize the solution, polyimide adhesive is used to bond adjacent upper hexagonal prism frames, adjacent lower hexagonal prism frames, and upper hexagonal prism frames and lower hexagonal prism frames.

[0041] Embodiment 1:

[0042] refer to Figure 2 The wall thickness of the upper hexagonal prism frame is 0.03-0.07mm, the long wall length is 2.77-14.4mm, the short wall length is 1.41-7.13mm, the height is 10-35mm, and the thickness of the fixed frame 2 is 0.02-0.05mm.

[0043] The wall thickness of the lower hexagonal prism frame is 0.05-0.1 mm, the diameter of the inscribed circle is 9.6-50 mm, the height is 15-40 mm, and the thickness of the fixed frame 2 is 0.03-0.06 mm.

[0044] Embodiment 2:

[0045] refer to Figure 3 The wall thickness of the upper hexagonal prism frame is 0.03-0.07 mm, the wall length is 3.7 mm, the height is 10-35 mm, and the thickness of the fixed frame 2 is 0.02-0.05 mm.

[0046] The wall thickness of the lower hexagonal prism frame is 0.05-0.1 mm, the diameter of the inscribed circle is 9.6-50 mm, the height is 15-40 mm, and the thickness of the fixed frame 2 is 0.03-0.06 mm.

[0047] When subjected to external force, the three lower hexagonal prism frames can jointly bear the pressure, while the upper hexagonal prism frame further disperses the pressure at the center point, thereby improving the stability of the overall structure.

[0048] Embodiment 3:

[0049] refer to Figure 4 In this embodiment, the diagonal distribution of the specific structure of the single hexagonal prism frame fixing frame 2 is changed to an interval angle distribution.

[0050] The present invention discloses a honeycomb coral-like sandwich heat protection structure based on composite materials, wherein the honeycomb coral-like structure is provided in the middle of the heat protection structure. This structure can increase the stability and impact resistance of the honeycomb coral-like structure through the design of a double-layer structure during the heat protection process. By setting a honeycomb coral-like structure in which the cross-sectional area and the gap ratio change gradually along a specified direction, stress can be effectively dispersed and stress concentration can be avoided, thereby improving the bearing capacity of the structure. By setting a fixing frame 2 in a hexagonal prism frame, the internal porosity is increased, which is conducive to blocking the transfer of heat.

[0051] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A honeycomb coral-shaped sandwich thermal protection structure based on composite materials, characterized in that: include: A composite first panel layer (4); A composite material second panel layer (5), the composite material second panel layer (5) being arranged opposite to the composite material first panel layer (4); A double-layer honeycomb coral-shaped sandwich, the double-layer honeycomb coral-shaped sandwich is arranged between the first composite panel layer (4) and the second composite panel layer (5), the double-layer honeycomb coral-shaped sandwich comprises an upper honeycomb coral layer (3) and a lower honeycomb coral layer (1), the lower honeycomb coral layer (1) comprises a plurality of lower hexagonal prism frames arrayed on the top surface of the second composite panel layer (5), the plurality of lower hexagonal prism frames are arranged in a honeycomb structure, the upper honeycomb coral layer (3) comprises a plurality of upper hexagonal prism frames of different sizes or different stacking methods, the plurality of upper hexagonal prism frames are arranged in a honeycomb shape between the first composite panel layer (4) and the lower hexagonal prism frame; Wherein, a fixing frame (2) is fixedly connected to the upper hexagonal frame and the lower hexagonal frame respectively.

2. The honeycomb coral-shaped sandwich thermal protection structure based on composite materials according to claim 1, characterized in that: The cross-sectional area and the gap ratio of the double-layer honeycomb coral-shaped interlayer gradually increase in the direction away from the first surface layer.

3. The honeycomb coral-shaped sandwich thermal protection structure based on composite materials according to claim 1, characterized in that: The wall thickness of the fixing frame (2) fixed to the lower hexagonal prism frame is greater than the wall thickness of the fixing frame (2) fixed to the upper hexagonal prism frame.

4. The honeycomb coral-shaped sandwich thermal protection structure based on composite materials according to claim 1, characterized in that: The height of the lower hexagonal frame is greater than the height of the upper hexagonal frame.

5. The honeycomb coral-shaped sandwich thermal protection structure based on composite materials according to claim 1, characterized in that: The diameter of the rod of the lower hexagonal prism frame is greater than the diameter of the rod of the upper hexagonal prism frame.

6. The honeycomb coral-shaped sandwich thermal protection structure based on composite materials according to claim 1, characterized in that: The diameter of the rod of the upper hexagonal prism frame and the diameter of the rod of the lower hexagonal prism frame are both greater than the diameter of the fixing frame (2).

7. The honeycomb coral-shaped sandwich thermal protection structure based on composite materials according to claim 1, characterized in that: Adjacent upper hexagonal prism frames, adjacent lower hexagonal prism frames, and the upper hexagonal prism frames and the lower hexagonal prism frames are bonded respectively using a polyimide adhesive.

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