Self-adaptive variable acting force heat shield

Abstract

The utility model discloses a self-adaptive variable acting force heat shield. The heat shield is mainly formed by an inner flexible metal dense net, an outer flexible metal dense net, a flexible heat insulation material and a supporting framework through a forming mold. The inner flexible metal dense net and the outer flexible metal dense net wrap and clamp the flexible heat insulation material to form the flexible main body of the heat insulation cover, so that the heat insulation cover is good in heat insulation performance, strong in damp heat resistance, mould resistance and salt mist resistance, moderate in toughness and rigidity, and capable of generating corresponding displacement and certain elastic deformation according to borne tension, compression and bending acting force; and the device can be suitable for strong wind blowing in any direction and can be used for a long time in a high-temperature environment.

Description

Technical Field

[0001] The utility model relates to a heat insulation cover with adaptive variable acting force, belonging to the field of aircraft thermal protection. Background Art

[0002] In the field of aircraft thermal protection, the thermal insulation requirements for hot end components and sensitive elements are becoming increasingly stringent. Some specific parts require that the thermal insulation covers used must be able to be pulled, pressed and bent at multiple angles, withstand high temperatures above 600°C, withstand winds of 0 to 60 m / s in different directions, and withstand humidity, heat, mold and salt spray environments.

[0003] Conventional high temperature heat shields are generally made of metal skin and heat insulation materials. Their structure cannot achieve tension, compression, bending, and cannot resist strong external wind at certain angles. Although the existing temperature resistant rubber can overcome the defect that the conventional metal skin heat shield structure cannot adapt to external force changes, it cannot be used for a long time in a high temperature environment above 300℃, and its resistance to humidity, heat, mold and salt spray environment is not as good as metal skin.

[0004] Therefore, in order to expand the use scope of the heat shield and meet the diverse thermal protection needs of aircraft, the design of the present utility model is now proposed. Summary of the invention

[0005] In response to the problems recorded in the background technology, the utility model aims to provide a heat insulation cover with adaptive variable force, which can provide aircraft hot end components and sensitive elements with a heat insulation cover that can be stretched and compressed at multiple angles, bent, and resistant to high temperatures above 600°C, strong winds in any direction, and resistant to moisture, heat, mold and salt spray environments.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A heat shield with adaptive variable force, comprising:

[0008] A flexible thermal insulation material, wherein two end surfaces in the thickness direction of the flexible thermal insulation material respectively form an outer surface and an inner surface, and both the outer surface and the inner surface are non-planar spatial curved surfaces;

[0009] An outer flexible metal dense mesh, wherein the outer flexible metal dense mesh is woven from stainless steel wires and / or alloy steel wires, and the outer flexible metal dense mesh is closely attached to the outer surface of the flexible thermal insulation material;

[0010] An inner flexible metal dense mesh, wherein the inner flexible metal dense mesh is woven from stainless steel wires and / or alloy steel wires, and the inner flexible metal dense mesh is closely attached to the inner surface of the flexible thermal insulation material;

[0011] A support frame, wherein the two support frames are respectively located at the two ends of the flexible thermal insulation material in the length direction or the width direction, the support frame comprises a slot, and the outer flexible metal mesh, the flexible thermal insulation material and the two ends of the inner flexible metal mesh in the length direction or the width direction are fixed inside the slot, the support frame is a rigid structure, and is fixedly connected to the object requiring thermal protection.

[0012] As an option, the flexible thermal insulation material is ceramic fiber thermal insulation felt.

[0013] Furthermore, the thickness of the ceramic fiber insulation felt is 2 to 5 mm.

[0014] Furthermore, the ceramic fiber thermal insulation felt is a single-layer structure or a multi-layer laminated structure.

[0015] As an option, the profiles of the outer surface and the inner surface of the flexible thermal insulation material in the cross section in the thickness direction of the flexible thermal insulation material are S-shaped, C-shaped or Ω-shaped.

[0016] As an option, the diameter of the stainless steel wire or alloy steel wire used in the outer flexible metal dense mesh and the inner flexible metal dense mesh is in the range of 0.025 mm to 0.35 mm.

[0017] As an option, the mesh spacing of the outer flexible metal dense mesh is larger than the mesh spacing of the inner flexible metal dense mesh.

[0018] As an option, the mesh spacing of the outer flexible metal dense mesh is 10-25 μm, and the mesh spacing of the inner flexible metal dense mesh is 8-20 μm.

[0019] As an option, the support frame is a stainless steel plate or a high-temperature alloy plate, and two parallel stainless steel plates or high-temperature alloy plates placed relatively spaced apart form a support frame.

[0020] As an option, the flexible thermal insulation material is a ceramic fiber thermal insulation felt that is both hydrophobic and oleophobic and can withstand high temperatures above 600°C.

[0021] Compared with the prior art, the heat shield designed by the utility model has the characteristics of being able to be stretched, compressed, and bent at multiple angles, and resistant to high temperatures above 600°C, and has the advantages of being resistant to strong winds in any direction, and resistant to humidity, heat, mold, and salt spray environments. The utility model makes up for the defects of conventional metal skin heat shields that cannot adapt to changes in external forces, and that temperature-resistant rubber cannot be used for a long time in high-temperature environments above 300°C and has weak resistance to humidity, heat, mold, and salt spray environments.

[0022] Compared with the prior art, the utility model adopts a flexible metal dense mesh, so that the heat insulation cover has a certain elastic deformation ability in any direction or angle, so that the heat insulation cover can withstand tension, compression, bending and strong wind blowing, and meet the requirements of harsh use environment.

[0023] Compared with the prior art, the flexible metal mesh used in the utility model is woven from fine filaments, is light in weight and soft, and can be rubbed like cloth. When blown by wind in any direction, the flexible metal mesh can produce a large-area deformation along the wind direction to release stress, thereby being able to timely alleviate and avoid the impact of strong winds on the heat insulation cover through deformation, especially the excessive local stress and stress concentration of the heat insulation cover caused by the strong wind impact, thereby avoiding problems such as breakage and failure of the heat insulation cover material due to excessive stress (heat insulation covers made of traditional metal skins are prone to damage and fracture due to local stress concentration under the impact of strong winds at higher wind speeds). BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of a heat shield with adaptive variable force in the utility model;

[0025] In the figure: 1. Support frame, 2. External flexible metal mesh, 3. Flexible thermal insulation material, 4. Internal flexible metal mesh. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0027] like Figure 1 As shown, the heat shield with adaptive variable force of the utility model is mainly made of inner flexible metal dense mesh 4, outer flexible metal dense mesh 2, ceramic fiber heat insulation felt and support frame 1 through molding mold. Figure 1 The cross-section structure of the heat shield is shown in FIG.

[0028] The support frame 1 is fixed to the outside of the object to be protected by heat as the installation structure of the heat shield. When the object to be protected by heat is displaced, deflected or bent, the support frame 1 does not displace, while the heat shield can produce corresponding displacement and certain elastic deformation according to the tensile, compressive and bending forces it bears, thereby maintaining the integrity of the structure and function. When the outside of the heat shield is blown by strong winds, the flexible structure composed of the inner flexible metal mesh 4 and the outer flexible metal mesh 2 can adapt to the wind direction to form a streamlined shape, reduce air flow resistance, and release stress, thereby maintaining the integrity of the structure and function.

[0029] The inner flexible metal dense net 4 is woven from stainless steel wires and (or) alloy wires, the wire diameters of the stainless steel wires and (or) alloy wires are selected in the range of 0.025mm to 0.35mm, and the mesh gap of the inner flexible metal dense net 4 is 8 to 20μm.

[0030] The outer flexible metal dense net 2 is woven from stainless steel wires and (or) alloy wires, the wire diameters of the stainless steel wires and (or) alloy wires are selected in the range of 0.025mm to 0.25mm, and the mesh gap of the outer flexible metal dense net 2 is 10 to 25μm.

[0031] The inner flexible metal mesh 4 and the outer flexible metal mesh 2 have certain toughness and rigidity, and can be made into S-shape, C-shape, Ω-shape and other shapes with the assistance of different molding molds, and can achieve the effects of pulling, pressing, bending and curling without damage.

[0032] Ceramic fiber insulation felt is composed of one or more of metal oxides (such as aluminum oxide or zirconium oxide), mesoporous materials (such as zeolite, MOF materials, etc.), silicates (such as aluminum silicate, aluminum silicate, calcium silicate, etc.), etc., with a thickness of 2 to 5 mm. According to the insulation requirements, ceramic fiber insulation felt can be used in a single layer or in multiple layers. Ceramic fiber insulation felt is soft, hydrophobic, oleophobic, has good insulation performance, and can withstand high temperatures above 600°C.

[0033] The support frame 1 is made of a high-temperature alloy plate or a stainless steel plate. Two plates are arranged in parallel and spaced apart to form a support frame 1. The two support frames 1 are respectively arranged at the two ends of the inner flexible metal mesh 4 and the outer flexible metal mesh 2 in the length direction or the width direction. The inner flexible metal mesh 4, the outer flexible metal mesh 2 and the ceramic fiber insulation felt are clamped by the space between the two plates.

[0034] The manufacturing method of the heat insulation cover with adaptive variable force in the utility model comprises the following steps:

[0035] Step 1: The inner flexible metal mesh 4 and the outer flexible metal mesh 2 are fixed to the support frame 1 by dense resistance spot welding;

[0036] Step 2: shaping the inner flexible metal mesh 4 and the outer flexible metal mesh 2 by using a molding mold. The shape of the molding mold is adjusted according to the shape of the heat-insulating object required in the use occasion of the heat-insulating cover, so as to cover the heat-insulating object;

[0037] Step 3, place the ceramic fiber insulation felt between the inner flexible metal mesh 4 and the outer flexible metal mesh 2 and ensure that the surfaces of the three are in close contact;

[0038] Step 4: The inner flexible metal mesh 4 and the outer flexible metal mesh 2 are fastened to the ceramic fiber insulation felt by welding the two opposing support frames 1 (here referring to the two opposing metal plates in each support frame 1).

[0039] The heat insulation cover made of ceramic fiber insulation felt sandwiched by the inner flexible metal dense mesh 4 and the outer flexible metal dense mesh 2 in the utility model has good insulation performance, strong resistance to moisture, heat, mildew and salt spray, moderate toughness and rigidity, can produce corresponding displacement and certain elastic deformation according to the tensile, compressive and bending forces it bears, can adapt to strong winds of 0 to 60 m / s in any direction, and can be used for a long time in a high temperature environment above 600°C.

[0040] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A heat shield with adaptive variable force, characterized in that: include: A flexible heat-insulating material (3), wherein two end surfaces in the thickness direction of the flexible heat-insulating material (3) respectively form an outer surface and an inner surface, and both the outer surface and the inner surface are non-planar spatial curved surfaces; An outer flexible metal dense mesh (2), wherein the outer flexible metal dense mesh (2) is woven from stainless steel wires and / or alloy steel wires, and the outer flexible metal dense mesh (2) is closely attached to the outer surface of the flexible thermal insulation material (3); An inner flexible metal dense mesh (4), wherein the inner flexible metal dense mesh (4) is woven from stainless steel wires and / or alloy steel wires, and the inner flexible metal dense mesh (4) is closely attached to the inner surface of the flexible thermal insulation material (3); A support frame (1), wherein the two support frames (1) are respectively located at the two ends of the flexible heat insulating material (3) in the length direction or the width direction, the support frame (1) comprises a slot, and the two ends of the outer flexible metal mesh (2), the flexible heat insulating material (3) and the inner flexible metal mesh (4) in the length direction or the width direction are fixed inside the slot, and the support frame (1) is a rigid structure and is fixedly connected to an object requiring heat protection.

2. The heat shield with adaptive variable force according to claim 1, characterized in that: The flexible thermal insulation material (3) is ceramic fiber thermal insulation felt.

3. The heat shield with adaptive variable force according to claim 2, characterized in that: The thickness of the ceramic fiber thermal insulation felt is 2 to 5 mm.

4. The heat shield with adaptive variable force according to claim 2, characterized in that: The ceramic fiber thermal insulation felt is a single-layer structure or a multi-layer laminated structure.

5. The heat shield with adaptive variable force according to claim 1, characterized in that: The profiles of the outer surface and the inner surface of the flexible heat-insulating material (3) in the cross section in the thickness direction of the flexible heat-insulating material (3) are S-shaped, C-shaped or Ω-shaped.

6. The heat shield with adaptive variable force according to claim 1, characterized in that: The diameter of the stainless steel wire or alloy steel wire used in the outer flexible metal dense net (2) and the inner flexible metal dense net (4) is in the range of 0.025 mm to 0.35 mm.

7. The heat shield with adaptive variable force according to claim 1, characterized in that: The mesh spacing of the outer flexible metal dense net (2) is larger than the mesh spacing of the inner flexible metal dense net (4).

8. The heat shield with adaptive variable force according to claim 7, characterized in that: The mesh spacing of the outer flexible metal dense net (2) is 10 to 25 μm, and the mesh spacing of the inner flexible metal dense net (4) is 8 to 20 μm.

9. The heat shield with adaptive variable force according to claim 1, characterized in that: The support frame (1) is a stainless steel plate or a high-temperature alloy plate, and two parallel stainless steel plates or high-temperature alloy plates placed relatively spaced apart form a support frame (1).

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