A heat sink suitable for high heat load conditions

Abstract

This utility model relates to a heat sink suitable for high heat load conditions, which solves the technical problems of poor uniformity, poor heat load bearing capacity, and significant impact on test results of existing heat sinks. It is a sealed cylindrical heat sink with a main pipe, branch pipes, and fins. The main pipe is arranged along the axial direction of the heat sink, while the branch pipes and fins are arranged circumferentially along the axial direction. The main pipe has an inlet pipe and an outlet pipe, and the branch pipes are located between the inlet and outlet pipes and connected to them respectively. Fins are located on both sides of the branch pipes, and the fins are in two layers: an inner layer and an outer layer, arranged parallel to each other. This utility model can be widely used in the field of space environment simulation equipment.

Description

Technical Field

[0001] This utility model relates to the field of space environment simulation equipment, specifically to a heat sink suitable for high heat load conditions. Background Technology

[0002] Ground-based simulation test chambers are the primary sites for testing spacecraft such as satellites, spacecraft, and space stations, or their components. Heat sinks are an important component of these chambers (space environment simulation equipment), and their function is to simulate the cold, dark environment of space on the ground to verify the thermal design and performance of spacecraft.

[0003] Currently, most heat sinks in domestic space environment simulation equipment adopt tube-fin type heat sinks. For example, Chinese invention patent with publication number CN103388948A discloses a liquid nitrogen-cold helium dual-medium coupled heat sink, which is a closed cylindrical shape, including a liquid nitrogen cooling pipe network, a cold gas helium cooling pipe network, copper fins and electric heaters. The copper fins connect the liquid nitrogen cooling pipe network and the cold gas helium cooling pipe network and together with the liquid nitrogen cooling pipe network and the cold gas helium cooling pipe network form the cylinder of the liquid nitrogen-cold helium dual-medium coupled heat sink. The electric heaters are evenly distributed on the copper fins.

[0004] Currently, in order to shorten the processing cycle and save processing costs, heat sinks often use a single branch pipe welded with a single fin. For example, Chinese invention patent with publication number CN101947474A discloses a graded liquid supply temperature self-compensating liquid helium heat sink structure, which improves the structure to make the flow rate of the cooling medium (liquid helium) in each branch pipe evenly distributed, thereby making the temperature distribution of each tube sheet tend to be consistent.

[0005] However, due to the influence of welding process and welding area between branch pipe and fin, the heat transfer resistance is relatively large, and the heat conduction of branch pipe to fin is limited. When conducting high heat load test specimen tests in space environment simulation equipment, the fin is greatly affected by radiation from the test specimen. In steady state, the temperature of the heat sink fin far from the branch pipe end is much higher than the temperature near the branch pipe end. The heat sink has poor uniformity and poor heat load bearing capacity, which has a great impact on the test results. Summary of the Invention

[0006] To address the technical problems of poor heat sink uniformity, poor heat load bearing capacity, and significant impact on test results in existing devices, this invention provides a heat sink with good uniformity and strong heat load bearing capacity, suitable for high heat load conditions.

[0007] This utility model provides a heat sink suitable for high heat load conditions. It is a closed cylindrical shape and has a main pipe, branch pipes and fins. The main pipe is arranged along the axial direction of the heat sink and has an inlet pipe and an outlet pipe. The branch pipes and fins are arranged circumferentially along the axial direction of the heat sink. The branch pipes are located between the inlet pipes and the outlet pipes and are connected to the inlet pipes and the outlet pipes respectively. The fins are arranged on both sides of the branch pipes. The fins are two layers, from the inside to the outside, consisting of an inner fin and an outer fin, which are arranged parallel to each other.

[0008] Preferably, the branch pipe is welded to the fin.

[0009] Preferably, the main body is made of stainless steel.

[0010] Preferably, the fins are made of copper.

[0011] The beneficial effects of this utility model are:

[0012] The outer fins of this invention provide radiative support to the inner fins. When the uniformity of the inner fins is poor, radiative heat exchange provides cooling to the inner fins. Simultaneously, the double-layer fins also play a positive role in achieving the working vacuum level of space environment simulation equipment, reducing the pumping pressure of the vacuum pump unit. This invention has a simple structure, is easy to manufacture, has significant effects, and high reliability, making it very suitable for application in high-heat-load test specimens in space environment simulation equipment. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0014] Figure 2 yes Figure 1 A schematic diagram of the side structure;

[0015] Figure 3 yes Figure 2 A schematic diagram of the AA section.

[0016] Explanation of symbols in the attached drawings:

[0017] 1. Main pipe; 11. Inlet pipe; 12. Outlet pipe; 2. Branch pipe; 3. Outer fins; 4. Inner fins. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, so that those skilled in the art to which the present invention pertains can easily implement the present invention.

[0019] like Figure 1-2As shown, this utility model includes a main pipe 1, a branch pipe 2, an outer fin 3, and an inner fin 4. The main pipe 1 is made of stainless steel and is further divided into an inlet pipe 11 and an outlet pipe 12. The branch pipe 2 is located between the inlet pipe 11 and the outlet pipe 12 and is connected to the inlet pipe 11 and the outlet pipe 12 respectively.

[0020] like Figure 3 As shown, outer fins 3 and inner fins 4 are arranged on both sides of branch pipe 2, and the outer fins 3 and inner fins 4 are parallel to each other.

[0021] During the processing and manufacturing process, the following steps are performed in sequence: material cutting, machining, plate rolling and pipe bending, cleaning and drying. Then, the branch pipe 2 is welded to the outer fin 3 and the inner fin 4 respectively, and then welded to the main pipe 1. After the overall welding is completed, cleaning and leak testing are performed. After three thermal shock tests, leak testing is performed again. Finally, black paint is sprayed to complete the processing and manufacturing.

[0022] In use, the cooling medium (liquid helium) is input through the inlet pipe 11, flows into the outlet pipe 12 through the branch pipe 2, and is output from the outlet pipe 12. The outer fins 3 provide radiative support to the inner fins 4. When the uniformity of the inner fins 4 is poor, radiative heat exchange provides cooling to the inner fins 4. The "single branch pipe double fin" structure of this utility model can improve the temperature uniformity of the inner fins 4, improve the thermal simulation performance of space environment simulation experiments, and improve the utilization rate of the cooling capacity of the fluid in the branch pipe 2. At the same time, the double fins also have a positive effect on achieving the working vacuum degree of the space environment simulation equipment, and can reduce the pumping pressure of the vacuum pump group.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the scope of the claims of the present invention should be within the protection scope of the present invention.

Claims

1. A heat sink suitable for high heat load conditions, comprising a closed cylindrical shape, a main pipe, branch pipes, and fins, wherein the main pipe is arranged along the axial direction of the heat sink, and the branch pipes and fins are arranged along the circumferential direction of the heat sink; the main pipe has an inlet pipe and an outlet pipe, the branch pipes are located between the inlet pipe and the outlet pipe and are respectively connected to the inlet pipe and the outlet pipe, and the fins are located on both sides of the branch pipes, characterized in that, The fins consist of two layers, with an inner fin and an outer fin arranged parallel to each other from the inside out.

2. The heat sink under high heat load conditions according to claim 1, characterized in that, The branch pipe is welded to the fin.

3. The heat sink under high heat load conditions according to claim 1, characterized in that, The main body is made of stainless steel.

4. The heat sink under high heat load conditions according to claim 1, characterized in that, The fins are made of copper.

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