Thermal control device suitable for waveguide with complex shape

Abstract

The invention provides a thermal control device suitable for a waveguide in a complex shape, and relates to the field of spacecraft thermal control, the thermal control device comprises a thermal insulation cover, electric heating sheets, a thermistor, a thermal control coating and a waveguide, the electric heating sheets are uniformly pasted on the inner surface of the thermal insulation cover, the waveguide is connected in the thermal insulation cover, the thermistor is pasted on the inner surface of the thermal insulation cover, and the thermal control coating is coated on the thermal control coating. The thermistor is adhered to a gap of the electric heating sheet, and thermal control coatings are respectively sprayed on the heat shield and the waveguide; the heat shield is of a semi-closed structure, the size of the heat shield is larger than an envelope formed by the waveguide, and the waveguide is surrounded by the heat shield to ensure the stability of a thermal environment. The size of the heat shield only needs to exceed the envelope of the waveguide, the universality is high, and the device is suitable for waveguides in any shape; the electric heating sheet and the thermistor are adhered to the heat shield, so that the design time and the operation time are greatly saved, and the efficiency is improved; sunlight is prevented from irradiating the surface of the waveguide through the heat shield, and the risk of high temperature is eliminated through the thermal control white paint.

Description

Technical Field

[0001] The present invention relates to the field of spacecraft thermal control, in particular to a thermal control device suitable for waveguides with complex shapes. Background Art

[0002] Waveguides are conventional structures used on spacecraft to directional guide electromagnetic waves, and are generally composed of a metal shell with a rectangular cavity in cross section. The same waveguide can only transmit electromagnetic waves in the same frequency band. With the continuous development of spacecraft technology, the same spacecraft often needs to transmit electromagnetic waves in multiple frequency bands. Therefore, the complexity of the waveguide structure is gradually increasing. At this time, the general approach is to integrate the waveguide design, resulting in a more complex shape of the waveguide structure.

[0003] The traditional waveguide thermal control method is to paste a heating plate and a thermistor on each waveguide and then spray thermal control white paint. For waveguides with complex shapes, the traditional thermal control method is no longer applicable. On the one hand, each waveguide surface is pasted with an electric heating plate, and then the electric heating plates are combined in series and parallel, which is difficult in both design and operation. On the other hand, there are many gaps between waveguides with complex shapes. If the waveguide is exposed to the outside, sunlight may shine into the gap of the waveguide, causing the waveguide to absorb too much heat, causing its temperature to exceed the allowable operating temperature range. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a thermal control device suitable for waveguides with complex shapes, which can heat the waveguide evenly, has strong adaptability, is simple to operate, and can greatly shorten the design cycle and implementation cycle.

[0005] A thermal control device suitable for a waveguide of a complex shape provided by the present invention comprises: a heat insulation cover, an electric heating sheet, a thermistor, a thermal control coating and a waveguide, wherein the electric heating sheet is evenly pasted on the inner surface of the heat insulation cover, the waveguide is connected inside the heat insulation cover, the thermistor is pasted on the inner surface of the heat insulation cover, and the thermistor is pasted in the gap of the electric heating sheet, and the thermal insulation cover and the waveguide are respectively sprayed with thermal control coatings;

[0006] The heat insulation cover is a semi-enclosed structure. The size of the heat insulation cover is larger than the envelope formed by the waveguide. The waveguide is surrounded by the heat insulation cover to ensure the stability of the thermal environment.

[0007] Preferably, the thermal control coating comprises black paint and white paint, the inner surface of the heat shield and the outer surface of the waveguide are sprayed with black paint, and the outer surface of the heat shield is sprayed with white paint;

[0008] The outer surface of the heat shield is painted white to ensure that the temperature is not too high, the inner surface of the heat shield is pasted with electric heating sheets and thermistors to ensure that the temperature is not too low, and the inner surface of the heat shield and the outer surface of the waveguide are painted black to enhance heat exchange.

[0009] Preferably, the surfaces of the electric heating plate and the thermistor are covered with black paint to enhance the heat exchange efficiency of the heat shield and the waveguide.

[0010] Preferably, the electric heating plate is composed of a constantan foil and a 25 μm polyimide film, and the constantan foil is packaged between two 25 μm polyimide films.

[0011] Preferably, the heat shield is made of carbon fiber M55J material.

[0012] Preferably, the power of the heating circuit composed of the electric heating plate is 30W.

[0013] Preferably, the thermistor is a MF501 thermistor.

[0014] Preferably, the white paint in the thermal control coating is ACR-1g type thermal control white paint, and the black paint is SR107-E51 type thermal control black paint.

[0015] Preferably, the operating temperature range of the waveguide is -15°C to 55°C.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The heat insulation cover in the present invention only needs to be larger than the envelope of the waveguide, and is highly versatile and applicable to waveguides of any shape;

[0018] (2) The present invention adheres the electric heating sheet and thermistor to the heat insulation cover, which greatly saves design time and operation time and improves efficiency;

[0019] (3) The present invention isolates the waveguide surface from sunlight by means of a heat shield, and at the same time, the outer surface of the heat shield is sprayed with low-absorption thermal control white paint, thereby eliminating the risk of high temperature caused by sunlight. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0021] Figure 1 This is an overall structural diagram of an embodiment of the present invention adapted to a complex waveguide module of a certain spacecraft;

[0022] Figure 2 This is a schematic diagram of the heat shield structure after the electric heating sheet, thermistor and thermal control coating are implemented in the present invention;

[0023] Figure 3 This is a diagram showing the effect of waveguide temperature data when the present invention is applied to a certain spacecraft in a test.

[0024] The figure shows: 1-heat insulation cover; 2-electric heating plate; 3-thermistor; 4-thermal control coating; 5-waveguide. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments 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 of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0026] Example 1

[0027] The embodiment of the present invention provides a thermal control device for a waveguide with a complex shape, such as Figure 1-2 As shown, it includes a heat insulation cover 1, an electric heating plate 2, a thermistor 3, a thermal control coating 4 and a waveguide 5. First, the heat insulation cover 1 is designed according to the envelope of the waveguide 5. The heat insulation cover 1 is a semi-closed structure, and the heat insulation cover 1 is slightly larger than the envelope of the waveguide 5. The electric heating plate 2 is evenly pasted on the inner surface of the heat insulation cover 1, and the thermistor 3 is also pasted on the inner surface of the heat insulation cover 1 and is located in the gap of the electric heating plate 2. The inner and outer surfaces of the heat insulation cover and the waveguide are sprayed with a thermal control coating 4, so as to form a thermal control device suitable for complex-shaped waveguides. When the temperature of the thermistor 3 drops below a preset threshold, the electric heating plate 2 turns on the heating, raises the overall temperature of the heat insulation cover, and raises the temperature of the waveguide inside the heat insulation cover. When sunlight shines on the heat insulation cover, the low-absorption thermal control white paint on the outer surface of the heat insulation cover plays a role in heat dissipation. When used on a satellite, it also includes a related control unit for controlling the temperature control circuit composed of the electric heating plate.

[0028] The thermal control coating 4 includes two types of thermal control coatings, black paint and white paint. The black paint is sprayed on the inner surface of the heat insulation cover 1 and the outer surface of the waveguide 5, and the white paint is sprayed on the outer surface of the heat insulation cover 1. The waveguide 5 has a complex structure and can only work within a certain temperature range. The outer surface of the heat insulation cover 1 is sprayed with white paint to ensure that the temperature is not too high, and the inner surface is pasted with the electric heating plate 2 and the thermistor 3 to ensure that the temperature is not too low. The enclosure of the heat insulation cover 1 provides a good thermal environment for the waveguide 5. At the same time, the inner surface of the heat insulation cover 1 and the outer surface of the waveguide 5 are sprayed with black paint to enhance the heat exchange between the two. In order to enhance the heat exchange efficiency between the heat insulation cover 1 and the waveguide 5, the thermal control black paint must be sprayed on the inner surface of the heat insulation cover 1 after the electric heating plate 2 and the thermistor 3 are pasted, so that the surface of the electric heating plate 2 is also covered with the thermal control black paint.

[0029] More specifically, the present embodiment has strong versatility. The device only needs the heat insulation cover 1 to be larger than the envelope of the waveguide 5, and is applicable to waveguides 5 of any shape. The operation and design are simple. The traditional thermal control method requires pasting an electric heating plate 2 on each waveguide 5, which is difficult to operate, and the series and parallel connection between the electric heating plates 2 must be considered, which is also difficult to design. The efficiency is high. The thermal control device greatly saves design time and operation time compared with the traditional thermal control device. The risk is low. If there is no heat insulation cover 1, the exposure of the waveguide 5 may cause sunlight to penetrate the gap of the waveguide 5, so that the heat of the sunlight is completely absorbed and the temperature of the waveguide 5 is too high. The heat insulation cover 1 isolates the sunlight from the surface of the waveguide 5. At the same time, the outer surface of the heat insulation cover 1 is sprayed with low-absorption thermal control white paint, eliminating the risk of high temperature caused by sunlight.

[0030] Example 2

[0031] This embodiment 2 is completed on the basis of embodiment 1, specifically: the heat insulation cover 1 is preferably made of carbon fiber M55J material, which has the advantages of low density and high strength. The electric heating plate 2 is composed of copper foil and 25μm polyimide film, and the copper foil is encapsulated in the middle by two 25μm polyimide films. The thermistor 3 is selected as MF501, and the power of the electric heater is set to 30W. The white paint in the thermal control coating 4 is selected as ACR-1g thermal control white paint, and the black paint is selected as SR107-E51 thermal control black paint.

[0032] After the above thermal control device was applied to a certain spacecraft, the temperature data of the waveguide during the thermal test of the spacecraft was monitored. Figure 3 is the temperature curve of the waveguide. From the thermal test temperature data, it can be seen that the temperature of waveguide 5 is between [-5°C, 20°C], which meets the requirement of its temperature index [-15°C, 55°C].

[0033] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "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 application and simplifying the description, and do not indicate or imply that the referred device or element 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 application.

[0034] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A thermal control device suitable for complex-shaped waveguides, characterized in that: include: A heat insulation cover (1), an electric heating sheet (2), a thermistor (3), a thermal control coating (4) and a waveguide (5), wherein the electric heating sheet (2) is evenly adhered to the inner surface of the heat insulation cover (1), the waveguide (5) is connected inside the heat insulation cover (1), the thermistor (3) is adhered to the inner surface of the heat insulation cover (1), and the thermistor (3) is adhered to the gap of the electric heating sheet (2), and the thermal control coating (4) is sprayed on the heat insulation cover (1) and the waveguide (5) respectively; The heat insulation cover (1) is a semi-enclosed structure; the size of the heat insulation cover (1) is larger than the envelope formed by the waveguide (5); the waveguide (5) is surrounded by the heat insulation cover (1) to ensure the stability of the thermal environment.

2. The thermal control device for complex-shaped waveguides according to claim 1, characterized in that: The thermal control coating (4) comprises black paint and white paint, the inner surface of the heat shield (1) and the outer surface of the waveguide (5) are sprayed with the black paint, and the outer surface of the heat shield (1) is sprayed with the white paint; The outer surface of the heat insulation cover (1) is painted with white paint to ensure that the temperature is not too high, the inner surface of the heat insulation cover (1) is pasted with the electric heating plate (2) and the thermistor (3) to ensure that the temperature is not too low, and the inner surface of the heat insulation cover (1) and the outer surface of the waveguide (5) are painted with black paint to enhance heat exchange.

3. The thermal control device for complex-shaped waveguides according to claim 2, characterized in that: The surfaces of the electric heating plate (2) and the thermistor (3) are covered with the black paint, thereby enhancing the heat exchange efficiency of the heat insulation cover (1) and the waveguide (5).

4. The thermal control device for complex-shaped waveguides according to claim 1, characterized in that: The electric heating plate (2) is composed of a constantan foil and a 25 μm polyimide film, and the constantan foil is packaged between two 25 μm polyimide films.

5. The thermal control device for complex-shaped waveguides according to claim 1, characterized in that: The heat insulation cover (1) is made of carbon fiber M55J material.

6. The thermal control device for complex-shaped waveguides according to claim 1, characterized in that: The power of the heating circuit formed by the electric heating plate (2) is 30W.

7. The thermal control device for complex-shaped waveguides according to claim 1, characterized in that: The thermistor (3) is a MF501 thermistor.

8. The thermal control device for complex-shaped waveguides according to claim 1, characterized in that: The white paint in the thermal control coating (4) is ACR-1g type thermal control white paint, and the black paint is SR107-E51 type thermal control black paint.

9. The thermal control device for complex-shaped waveguides according to claim 1, characterized in that: The operating temperature range of the waveguide (5) is -15°C to 55°C.

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