Heat dissipation device for optical fiber transmission system of lunar base

Abstract

The invention relates to the technical field of deep space exploration and testing, in particular to a heat dissipation device for a lunar base optical fiber transmission system, which comprises a packaging shell, a heat conduction reinforcing rib, foam metal, an alkyl composite phase change material, a liquid metal phase change material, an optical fiber via hole and heat conduction gel, a cavity is formed in the packaging shell, and a plurality of heat conduction reinforcing ribs are formed; gaps are formed among the plurality of heat-conducting reinforcing ribs; the gap is filled with foam metal; the foam metal is filled with an alkyl composite phase change material; the shell is filled with a liquid metal phase change material; the optical fiber passes through the packaging shell through an optical fiber through hole in the shell and is in contact with the liquid metal phase change material in the packaging shell; gaps between the optical fibers and the optical fiber via holes are filled with heat-conducting gel; according to the invention, the ineffectiveness of air cooling and liquid cooling heat dissipation can be overcome, and the heat dissipation efficiency of the lunar-based optical fiber transmission system is improved.

Description

Technical Field

[0001] The present invention relates to the field of deep space exploration and test technology, and in particular to a heat dissipation device for an optical fiber transmission system of a lunar base. Background Art

[0002] The lunar exploration project is one of the most challenging fields in the world's high-tech field today. Building a lunar base is an important means for mankind to achieve in-depth development and utilization of lunar resources.

[0003] To achieve the exploration goals of the lunar base, the Mars base and even more distant outer space, we must rely on the Bioregenerative Life Support System (BLSS) technology, using green plants and photosynthetic algae to carry out photosynthesis, absorb CO2, produce oxygen, regenerate air and water while producing food and processing waste, and provide material support for the life activities of astronauts.

[0004] In order to provide sufficient light source for algae plants, a lighting system based on fiber optic transmission can be used. In the process of light transmission, the optical fiber will generate a lot of heat, causing photothermal aging of the entire system. The optical fiber itself is relatively fragile and difficult to repair after damage, which will lead to a decrease in light transmission efficiency. Due to the thin air on the moon, air cooling and liquid cooling cannot be provided. Air conditioning requires a lot of power and consumes too much energy. The TEC cooling method has too low cooling efficiency and it is difficult to achieve heat dissipation at the hot end.

[0005] To this end, it is necessary to dissipate heat from the optical fiber transmission system of the lunar base to reduce the damage to the optical fiber caused by the impact of the temperature difference between day and night on the moon. Summary of the invention

[0006] In view of the above problems, the present invention provides a heat dissipation device for the optical fiber transmission system of the lunar base, which solves the technical problem of ineffective air cooling and liquid cooling caused by the thin air on the moon in the prior art.

[0007] The present invention provides a heat dissipation device for a lunar base optical fiber transmission system, comprising: a packaging shell 1, a heat conductive reinforcement rib 2, a foam metal 3, an alkyl composite phase change material 4, a liquid metal phase change material 5, an optical fiber via 7 and a heat conductive gel 8;

[0008] A cavity is formed in the packaging shell 1, and the cavity includes a first space and a second space; a plurality of thermal conductive reinforcement ribs 2 are formed in the first space; gaps are provided between the plurality of thermal conductive reinforcement ribs 2; the gaps are filled with foam metal 3; the foam pores of the foam metal 3 are filled with an alkyl composite phase change material 4; the second space is filled with a liquid metal phase change material 5; a pair of optical fiber vias 7 are provided on the packaging shell 1, and the optical fiber 6 passes through the packaging shell 1 through the optical fiber vias 7 and contacts with the liquid metal phase change material 5 in the packaging shell 1; a thermal conductive gel 8 is used to fill the gap between the optical fiber 6 and the optical fiber via 7.

[0009] Preferably, the packaging shell 1 is made of 6063 aluminum alloy.

[0010] Preferably, the thermally conductive reinforcing ribs 2 are fixedly connected to the packaging shell 1 , and the thermally conductive reinforcing ribs 2 are milled out of the packaging shell 1 by CNC method.

[0011] Preferably, the foam metal 3 is connected in the gaps between the plurality of heat-conducting reinforcement ribs 2 by welding.

[0012] Preferably, the alkyl composite phase change material 4 is composed of a mixture of phase change material and graphite powder and has fluidity.

[0013] Preferably, when the heat dissipation device is used for heat dissipation, the optical fiber 6 passes through a plurality of the heat dissipation devices, and the intervals between the heat dissipation devices are 0.5 to 1.5 m.

[0014] Preferably, the spacing d between the plurality of thermally conductive reinforcing ribs 2 is adjusted by adjusting the width and the total number of the thermally conductive reinforcing ribs 2, and the calculation expression is:

[0015]

[0016] Wherein, L is the side length of the packaging shell 1, w rib is the width of a single thermally conductive reinforcement rib, and n is the total number of thermally conductive reinforcement ribs 2.

[0017] Preferably, the packaging shell 1 and the second space are both square, and the ratio λ of the side length of the packaging shell 1 to the side length of the second space satisfies:

[0018]

[0019] Among them, k1 and k2 are the heat transfer coefficients of the liquid metal phase change material and the alkyl composite phase change material, respectively, and ΔT1 and ΔT2 are the temperature difference between the optical fiber and the liquid metal phase change material and the temperature difference between the liquid metal phase change material and the alkyl composite phase change material, respectively.

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

[0021] (1) The present invention effectively adjusts the temperature of the optical fiber transmission system through the heat absorption and heat release characteristics of the phase change material, avoids the damage to the optical fiber caused by high and low temperatures, and ensures the stability and reliability of the optical fiber under the temperature difference between day and night.

[0022] (2) The present invention adopts a passive heat dissipation method, which does not require additional power supply and uses the physical properties of phase change materials to dissipate heat. It avoids the problem that traditional cooling methods require an atmospheric environment or high energy consumption, adapts to the energy limitations of the lunar base, and improves the energy efficiency of the overall system.

[0023] (3) The present invention enhances the heat exchange efficiency by designing components such as the packaging shell, heat-conducting reinforcing ribs, foam metal and composite phase change materials. The high thermal conductivity of the liquid metal phase change material allows the excessive heat to diffuse quickly, ensuring the stability of the optical fiber temperature, extending the service life of the optical fiber and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are only for the purpose of illustrating particular embodiments and are not to be construed as limiting the invention.

[0025] Figure 1 A top view of the heat dissipation device for the optical fiber transmission system of the lunar base provided by the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of the heat dissipation device for the optical fiber transmission system of the lunar base provided by the present invention.

[0027] Figure 3 A schematic diagram of a heat dissipation device array for a lunar base optical fiber transmission system provided by the present invention.

[0028] Figure numerals: 1-packaging shell, 2-thermal conductive reinforcement rib, 3-foam metal, 4-alkyl composite phase change material, 5-liquid metal phase change material, 6-optical fiber, 7-optical fiber via, 8-thermal conductive gel. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In addition, the present invention can also be implemented in other ways different from those described herein, and therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0030] In order to illustrate the effectiveness of the method proposed by the present invention, the above technical solution of the present invention is described in detail below through a specific embodiment. Figure 1As shown, a heat dissipation device for the optical fiber transmission system of the lunar base is disclosed, including a packaging shell 1, a thermal conductive reinforcement rib 2, a foam metal 3, an alkyl composite phase change material 4, a liquid metal phase change material 5, an optical fiber via 7, and a thermal conductive gel 8.

[0031] A cavity is formed in the packaging shell 1, and the cavity includes a first space and a second space; a plurality of thermal conductive reinforcement ribs 2 are formed in the first space; gaps are provided between the plurality of thermal conductive reinforcement ribs 2; the gaps are filled with foam metal 3; the foam pores of the foam metal 3 are filled with an alkyl composite phase change material 4; the second space is filled with a liquid metal phase change material 5; a pair of optical fiber vias 7 are provided on the packaging shell 1, and the optical fiber 6 passes through the packaging shell 1 through the optical fiber vias 7 and contacts with the liquid metal phase change material 5 in the packaging shell 1; a thermal conductive gel 8 is used to fill the gap between the optical fiber 6 and the optical fiber via 7.

[0032] In some embodiments, the packaging shell 1 can encapsulate phase change materials and is made of 6063 aluminum alloy.

[0033] In some embodiments, the thermally conductive reinforcing ribs 2 and the packaging shell 1 are integrated, and the thermally conductive reinforcing ribs 2 are milled out of the packaging shell by CNC.

[0034] In some embodiments, the foam metal 3 is an irregular porous structure and is connected in the gap of the thermal conductive reinforcement ribs 2 by welding to enhance the heat exchange.

[0035] In some embodiments, the alkyl composite phase change material 4 is composed of a mixture of phase change material and graphite powder, which can improve the overall thermal conductivity of the material while maintaining the fluidity of the material.

[0036] In some embodiments, the liquid metal phase change material 5 is made of liquid metal. The high thermal conductivity of the liquid metal is used to quickly absorb the excessive heat of the working optical fiber, and then diffuse it to the alkyl composite phase change material 4 in the surrounding second space to ensure the stability of the optical fiber temperature.

[0037] The gap between the optical fiber 6 and the optical fiber via 7 is filled with a thermally conductive gel 8, which can reduce the contact thermal resistance between the two parties and enhance heat exchange.

[0038] In some embodiments, during use, the optical fiber 6 is passed through the heat dissipation device, and the optical fiber via 7 is sealed by the thermal conductive gel 8. A heat dissipation device is placed every 0.5 to 1.5 m to ensure that the optical fiber has enough space for flexion and extension when deformed due to the temperature difference between day and night.

[0039] In some embodiments, the spacing d of the thermally conductive reinforcing ribs 2 needs to ensure the filling of the foam metal and the phase change material and does not affect the heat transfer efficiency. The calculation expression of the spacing d is:

[0040]

[0041] Where L is the side length of shell 1, w rib is the width of a single thermally conductive reinforcing rib, and n is the total number of thermally conductive reinforcing ribs 2. By adjusting the width and total number of thermally conductive reinforcing ribs 2, the spacing d ensures the filling of the foam metal 3 and the alkyl composite phase change material 4 without affecting the heat transfer efficiency.

[0042] In some embodiments, Figure 2 As shown, the shell 1 and the second space are both square in top view, and the second space is located at the center of the shell 1. In order to make full use of the high thermal conductivity of the liquid metal phase change material 5, the excessive heat of the working optical fiber is quickly absorbed, and then diffused to the alkyl composite phase change material 4 in the surrounding second space, it is necessary to satisfy the heat conduction value from the optical fiber to the liquid metal phase change material and the heat conduction value from the liquid metal phase change material to the alkyl composite phase change material are equal, that is:

[0043]

[0044] Among them, Q is the heat to be conducted, k1, k2 are the heat transfer coefficients of the liquid metal phase change material and the alkyl composite phase change material, ΔT1, ΔT2 are the temperature difference between the optical fiber and the liquid metal phase change material and the temperature difference between the liquid metal phase change material and the alkyl composite phase change material, d1, d2 are the contact distance from the optical fiber to the liquid metal phase change material and the contact distance from the liquid metal phase change material to the alkyl composite phase change material, A1, A2 are the contact distance from the optical fiber to the liquid metal phase change material and the contact area from the liquid metal phase change material to the alkyl composite phase change material. And A1 is proportional to the side length l of the second space, A2 is proportional to the side L of the shell, d1, d2 are smaller values, when d1=d2 is satisfied, it can be obtained:

[0045]

[0046] In some embodiments, the ratio λ between the side length of the housing and the side length of the second space is in the range of 2 to 4. With this side length ratio, the heat conduction value from the optical fiber to the liquid metal phase change material and the heat conduction value from the liquid metal phase change material to the alkyl composite phase change material can be equal, thereby improving the heat dissipation efficiency.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] In the present invention, the terms "first", "second", "third", "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more, unless otherwise clearly defined.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A heat dissipation device for the optical fiber transmission system of the lunar base, characterized in that: include: Packaging shell (1), heat-conducting reinforcing ribs (2), foam metal (3), alkyl composite phase change material (4), liquid metal phase change material (5), optical fiber via (7) and heat-conducting gel (8); A cavity is formed in the packaging shell (1), and the cavity includes a first space and a second space; a plurality of heat-conducting reinforcing ribs (2) are formed in the first space; gaps are provided between the plurality of heat-conducting reinforcing ribs (2); the gaps are filled with foam metal (3); the foam pores of the foam metal (3) are filled with an alkyl composite phase change material (4); the second space is filled with a liquid metal phase change material (5); a pair of optical fiber vias (7) are provided on the packaging shell (1), and the optical fiber (6) passes through the packaging shell (1) through the optical fiber vias (7) and contacts the liquid metal phase change material (5) in the packaging shell (1); a thermally conductive gel (8) is used to fill the gap between the optical fiber (6) and the optical fiber via (7).

2. The heat dissipation device for the optical fiber transmission system of the lunar base according to claim 1 is characterized in that: The material of the packaging shell (1) is 6063 aluminum alloy.

3. The heat dissipation device for the optical fiber transmission system of the lunar base according to claim 2 is characterized in that: The heat-conducting reinforcing rib (2) is fixedly connected to the packaging shell (1), and the heat-conducting reinforcing rib (2) is milled out of the packaging shell (1) by CNC method.

4. The heat dissipation device for the optical fiber transmission system of the lunar base according to claim 3 is characterized in that: The foam metal (3) is connected in the gaps between the plurality of heat-conducting reinforcing ribs (2) by welding.

5. The heat dissipation device for the optical fiber transmission system of the lunar base according to claim 4 is characterized in that: The alkyl composite phase change material (4) is composed of a mixture of phase change material and graphite powder and has fluidity.

6. The heat dissipation device for the optical fiber transmission system of the lunar base according to claim 5 is characterized in that: When the heat dissipation device is used for heat dissipation, the optical fiber (6) passes through a plurality of the heat dissipation devices, and the intervals between the heat dissipation devices are 0.5 to 1.5 m.

7. The heat dissipation device for the optical fiber transmission system of the lunar base according to claim 6 is characterized in that: The spacing d between the plurality of thermally conductive reinforcing ribs (2) is adjusted by adjusting the width and the total number of the thermally conductive reinforcing ribs (2), and the calculation expression is: Wherein, L is the side length of the packaging shell (1), w rib is the width of a single thermally conductive reinforcement rib, and n is the total number of thermally conductive reinforcement ribs (2).

8. The heat dissipation device for the optical fiber transmission system of the lunar base according to claim 7 is characterized in that: The encapsulating shell (1) and the second space are both square, and the ratio λ of the side length of the encapsulating shell (1) to the side length of the second space satisfies: Among them, k1 and k2 are the heat transfer coefficients of the liquid metal phase change material and the alkyl composite phase change material, respectively, and ΔT1 and ΔT2 are the temperature difference between the optical fiber and the liquid metal phase change material and the temperature difference between the liquid metal phase change material and the alkyl composite phase change material, respectively.

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