Reflector structure capable of rapid passive temperature equalization and preparation method thereof

Abstract

The present invention provides a reflector structure capable of rapid passive temperature equalization and a preparation method thereof, comprising an inner skin, an outer skin, and a sandwich layer, wherein the inner skin is arranged on the concave side of the reflector, the outer skin is arranged on the protruding side of the reflector, and the sandwich layer is arranged between the inner skin and the outer skin; the inner skin and the outer skin are both carbon fiber laminates; the sandwich layer comprises a supporting structure and a heat-conducting functional structure, and the supporting structure is filled between the heat-conducting functional structure and the inner skin and the outer skin. The present invention can effectively improve the thermal conductivity by using a sandwich layer containing a supporting structure and a heat-conducting functional structure, thereby improving the uniformity of the reflector's own temperature field under conditions of extreme temperature distribution differences. The present invention realizes the integrated manufacturing of the reflector through RTM one-piece molding, reduces the structural deformation caused by secondary bonding, and thus improves the molding accuracy of the reflector itself.

Description

Technical Field

[0001] The present invention relates to the field of satellite-borne solid-surface antennas, and in particular to a reflector structure capable of rapid and passive temperature equalization and a preparation method thereof. Background Art

[0002] The main structure of a reflector antenna includes a feed, a reflector, a back frame, and a supporting structure, with the reflector being the primary functional component. The reflector of a geostationary orbit detector antenna will operate on a geostationary satellite platform. The space environment of geosynchronous satellites is extremely harsh, and the temperature difference between the reflector's solar-exposed and unexposed locations can be as great as 280°C. Conventional sandwich reflectors have extremely poor thermal conductivity, resulting in an extremely uneven temperature distribution on the reflector panel. This can cause significant thermal deformation and lead to structural failure.

[0003] An existing Chinese patent, publication number CN108000968A, discloses a novel terahertz carbon fiber composite panel structure, comprising a panel body, characterized in that the panel body comprises a core material and a skin wrapped around the outer surface of the core material, with a skin layer attached to each of the upper and lower surfaces of the core material. The core material is a carbon fiber sandwich structure, the skin is a carbon fiber laminate, and the carbon fiber plywood is bonded to the outer surface of the carbon fiber sandwich structure via resin curing adhesive. The panel body in the existing patent comprises a core material and a skin wrapped around the outer surface of the core material, with a skin layer attached to each of the upper and lower surfaces of the core material. The core material is a carbon fiber sandwich structure, the skin is a carbon fiber laminate, and the carbon fiber plywood is bonded to the outer surface of the carbon fiber sandwich structure via resin curing adhesive. This structure has poor structural integrity due to the need for adhesive bonding between the skin and the core material. Furthermore, the central core material, a carbon fiber sandwich structure, has poor thermal conductivity. When different parts of the structure are heated unevenly, the temperature field of the panel itself is difficult to be uniform, resulting in significant thermal deformation of the overall structure.

[0004] The inventors believe that it is necessary to provide a reflector structure and preparation method that can improve the heat transfer energy of the sandwich layer, ensure the overall uniformity of the temperature field of the reflector, reduce thermal deformation, and ensure that the reflector can meet the use requirements and can quickly and passively equalize the temperature. Summary of the Invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide a reflector structure capable of rapid and passive temperature equalization and a preparation method thereof.

[0006] According to the present invention, a reflector structure capable of rapid passive temperature equalization is provided, comprising: an inner skin, an outer skin and a sandwich layer, wherein the inner skin is arranged on a concave side of the reflector, the outer skin is arranged on a protruding side of the reflector, and the sandwich layer is arranged between the inner skin and the outer skin; the inner skin and the outer skin both comprise carbon fiber laminates; the sandwich layer comprises a supporting structure and a heat-conducting functional structure, and the supporting structure is filled between the heat-conducting functional structure and the inner skin and the outer skin.

[0007] Preferably, the support structure comprises a composite material tube array structure of a single structure.

[0008] Preferably, the composite material tube array structure includes regular polygonal or circular tubes, and the regular polygons include squares and regular hexagons.

[0009] Preferably, the ply of the composite tube array structure is quasi-isotropic ply, and the ply angle includes [45 / -45] n 、[45 / 0 / -45 / 90] n .

[0010] Preferably, the heat-conducting functional structure comprises a lightweight heat-conducting material, and the lightweight heat-conducting material comprises graphite foam, carbon foam, or low-density metal foam.

[0011] Preferably, the surface of the inner skin is plated with a metal layer.

[0012] According to the present invention, a method for preparing a reflector structure capable of rapid passive temperature equalization is provided, which adopts RTM molding and includes the following steps:

[0013] Step S1, laying carbon fiber on the inner side of the mold;

[0014] Step S2, laying a composite material on the outside of the heat-conducting functional structure and placing it into a mold;

[0015] Step S3, laying carbon fibers on the sandwich layer;

[0016] Step S4: closing the mold, injecting resin into the mold and curing it.

[0017] Preferably, in step S2, the composite material includes fibers.

[0018] Preferably, in step S2, the layer thickness is 1-5 mm.

[0019] Preferably, in step S2, the heat-conducting functional structure is machined into a columnar structure.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention can effectively improve the thermal conductivity by using a sandwich layer containing a support structure and a heat-conducting functional structure, thereby improving the uniformity of the reflector's own temperature field under conditions of extreme temperature distribution differences, helping to reduce thermal deformation caused by its own temperature field unevenness, and ensuring the performance of the reflector.

[0022] 2. The present invention realizes the integrated manufacturing of the reflector through RTM integral molding, reduces the structural deformation caused by secondary bonding, thereby improving the molding accuracy of the reflector itself, and has a high degree of integration, making the manufacturing simple and practical.

[0023] 3. The present invention uses the inner skin as the use surface and the outer skin as the structural surface, and the two cooperate with the sandwich layer to form a sandwich structure to ensure the overall structural rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0025] Figure 1 This is a schematic structural diagram of a reflector structure capable of rapid passive temperature equalization, which is mainly embodied in the present invention;

[0026] Figure 2 This is a partial cross-sectional view of a reflector structure capable of rapid passive temperature equalization, which is mainly embodied in the present invention;

[0027] Figure 3 This is a schematic diagram of the local structure of the sandwich layer mainly embodied in the present invention.

[0028] As shown in the figure:

[0029] Inner skin 1 Outer skin 2 Sandwich layer 3

[0030] Support structure 4 Heat conduction function structure 5 DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figure 1-3As shown, a reflector structure capable of rapid passive temperature equalization according to the present invention comprises: an inner skin 1, an outer skin 2 and a sandwich layer 3, wherein the inner skin 1 is arranged on the concave side of the reflector, the outer skin 2 is arranged on the protruding side of the reflector, and the sandwich layer 3 is arranged between the inner skin 1 and the outer skin 2; the inner skin 1 and the outer skin 2 both comprise carbon fiber laminates; the sandwich layer 3 comprises a support structure 4 and a heat-conducting functional structure 5, and the support structure 4 is filled between the heat-conducting functional structure 5 and the inner skin 1 and the outer skin 2.

[0034] The present application effectively solves the disadvantage of poor internal and external thermal conductivity of conventional sandwich structure reflectors by using a sandwich layer 3 containing a support structure 4 and a heat-conducting functional structure 5. By improving the overall thermal conductivity, the reflector's own temperature field uniformity under conditions of extreme temperature distribution differences is improved, thereby reducing the thermal deformation of the entire reflector caused by the uneven temperature field, thereby ensuring the use of the reflector.

[0035] The support structure 4 includes a single composite tube array structure. The composite tube array structure includes regular polygonal or circular tubes, and the regular polygons include squares and regular hexagons. The composite tube array structure is laid in a quasi-isotropic manner, and the layup angles include [45 / -45]. n 、[45 / 0 / -45 / 90] n .

[0036] The heat-conducting structure 5 is composed of lightweight thermally conductive materials, such as graphite foam, carbon foam, and low-density metal foam. This composite structure improves the heat transfer performance of the sandwich layer 3, ensuring the overall uniformity of the reflector's temperature field and minimizing thermal deformation, ensuring the reflector meets operational requirements.

[0037] One side of the inner skin 1 is the reflector surface for receiving signals, and is generally plated with a metal layer on the surface of the inner skin 1. The outer skin 2 is a structural surface mainly to form a sandwich structure with the middle sandwich layer 3 and the inner skin 1 to ensure the overall structural rigidity.

[0038] This application greatly improves the heat transfer rate of the reflector itself by adopting a composite structure sandwich layer 3 of composite materials and lightweight thermal conductive materials, so that it can achieve temperature field balance in a shorter time, thereby improving the stability of the reflector under extreme temperature environment conditions.

[0039] Example 2

[0040] According to a method for preparing a reflector structure capable of rapid passive temperature equalization provided by the present invention, based on Example 1, RTM molding is adopted, comprising the following steps:

[0041] Step S1, laying carbon fiber on the inner side of the mold;

[0042] Step S2, laying a composite material on the outside of the heat conducting functional structure 5 and placing it into a mold;

[0043] Step S3, laying carbon fibers on the sandwich layer 3;

[0044] Step S4: closing the mold, injecting resin into the mold and curing it.

[0045] In step S2, the heat conducting functional structure 5 is machined into a columnar structure. The composite material includes fibers, the ply thickness is 1-5 mm, and the ply angle is [45 / -45]. n or [45 / 0 / -45 / 90] n . Fibers are laid on the outside of each columnar structure according to the laying requirements, and then multiple thermal conductive functional structures 5 wrapped with fibers on the outside are placed into the mold in sequence. The present application is an integrated molding structure, that is, the internal fibers and thermal conductive functional structures 5 are laid first, and then the resin is injected, and after curing, an integral structure is formed. Compared with the thermal conductive functional structure 5, the thickness of the support structure 4 is very small, but the strength is sufficient to support the thermal conductive functional structure 5, thereby ensuring the stability of the sandwich layer 3 structure.

[0046] This application realizes the integrated manufacturing of the reflector through RTM one-piece molding, reduces the structural deformation caused by secondary bonding, and thus improves the molding accuracy of the reflector itself. The surface accuracy of the reflector is better than 5μm, and the thermal conductivity of the reflector is better than 40W / (m·k).

[0047] In a space environment, the thermal conductivity of the sandwich layer 3 is at least higher than 180 W / (m·K), thereby ensuring the temperature uniformity of the entire reflector. The present application adopts an integrated sandwich structure of composite materials, which improves the temperature uniformity of the reflector itself in a space with uneven ambient temperature and ensures the performance of the reflector.

[0048] The present application adopts a composite sandwich layer 3 to replace the original honeycomb or array structure, thereby improving the overall thermal conductivity of the reflector, reducing thermal deformation caused by the uneven temperature field itself, and ensuring the observation performance of the satellite-borne high-precision microwave antenna; and the present application also has the advantages of high degree of integration, simple manufacturing and strong practicality.

[0049] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, 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 cannot be understood as a limitation on this application.

[0050] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A reflector structure capable of rapid passive temperature equalization, characterized in that: include: An inner skin (1), an outer skin (2), and a sandwich layer (3), wherein the inner skin (1) is arranged on a concave side of a reflector, the outer skin (2) is arranged on a protruding side of the reflector, and the sandwich layer (3) is arranged between the inner skin (1) and the outer skin (2); The inner skin (1) and the outer skin (2) both comprise carbon fiber laminates; The sandwich layer (3) comprises a support structure (4) and a heat-conducting functional structure (5), and the support structure (4) is filled between the heat-conducting functional structure (5) and the inner skin (1) and the outer skin (2); The heat-conducting functional structure (5) comprises a light heat-conducting material, and the light heat-conducting material comprises graphite foam, carbon foam, or low-density metal foam; The support structure (4) comprises a composite material tube array structure of a single structure; The composite material tube array structure includes regular polygonal or circular tubes, and the regular polygons include squares and regular hexagons; The ply of the composite tube array structure is quasi-isotropic, and the ply angle includes [45 / -45] n 、[45 / 0 / -45 / 90] n ; The surface of the inner skin (1) is plated with a metal layer.

2. A method for preparing the reflector structure capable of rapid passive temperature equalization according to claim 1, characterized in that: RTM molding includes the following steps: Step S1, laying carbon fiber on the inner side of the mold; Step S2, laying a composite material on the outside of the heat-conducting functional structure (5) and placing it into a mold; Step S3, laying carbon fibers on the sandwich layer (3); Step S4, closing the mold, injecting resin into the mold and curing; In the step S2, the composite material includes fibers; In step S2, the layer thickness is 1-5 mm.

3. The method for preparing a reflector structure capable of rapid passive temperature equalization according to claim 2, wherein: In the step S2, the heat-conducting functional structure (5) is machined into a columnar structure.

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