Phase change energy storage superstructure with high efficiency heat exchange and additive process method

Abstract

The application discloses a phase change energy storage superstructure with high heat exchange efficiency and an additive process method, which comprises a shell, a plurality of superstructure units are connected in the shell, the superstructure unit comprises a cylinder and a four-sided pyramid connected to one end of the cylinder, the tip of the four-sided pyramid is connected with the cylinder, the axis of the cylinder is perpendicular to the bottom surface of the four-sided pyramid, the cylinder is perpendicular to the plane where the shell is located, and the bottom surface of the four-sided pyramid is connected to the same side in the shell. The phase change energy storage superstructure has a high filling amount of phase change working medium, high heat exchange efficiency and high strength.

Description

TECHNICAL FIELD

[0001] The application relates to a phase change energy storage structure with high-efficiency heat exchange and an additive process method, and belongs to the field of spacecraft lightweight thermal control and load integrated structure design and manufacturing. BACKGROUND

[0002] New-generation high-power loads such as microwave integrated circuits, high-throughput processors and laser diodes have been gradually applied in spacecraft. The performance and reliability of electronic integrated devices in spacecraft are very sensitive to temperature, and the efficient thermal management of local high heat flux density is particularly prominent. The main function of the phase change energy storage device is to control the temperature of the effective load equipment. The phase change material filled in the device structure absorbs or releases heat to realize the relative constant temperature control of the equipment.

[0003] At present, the phase change device manufactured based on mechanical processing has the problems of small phase change working medium storage space, large structure weight and low manufacturing yield. The phase change energy storage device (CN107742014) based on additive manufacturing realizes the lightweight of the device and the maximization of the working medium filling through the integration of the metal light plate shell and the internal filling point array. However, the additive manufacturing shaping direction adopts the vertical standing type, the small upper top surface internal point array support encryption, the weight of the design model is less, the manufacturing cycle is longer, the horizontal type, the large plane internal point array support encryption, the weight of the design model is more, the manufacturing cycle is shortened. Both types cannot further consider reducing the manufacturing cycle and improving the lightweight. First, the design only considers the thermal storage limit of the phase change working medium, and does not improve the heat exchange efficiency through structure design. Secondly, the design only considers the internal pressure resistance of the structure, and does not consider the external pressure load, and does not realize the structure load integration, which limits the application scene. At the same time, the additive manufacturing shaping, post-processing technology and other aspects of the phase change energy storage device still need to be further clarified.

[0004] In summary, the current additive manufacturing phase change energy storage device structure has low heat exchange efficiency, limited load capacity and insufficient additive process system integrity. The phase change energy storage device filled in the load-heat exchange superstructure by additive manufacturing is an effective technical approach to meet the above requirements. SUMMARY

[0005] The technical problem solved by the application is to overcome the shortcomings of the prior art and provide a phase change energy storage superstructure design with high-efficiency heat exchange and an additive process method, which improves the thermal management capability of high heat flux density loads of spacecraft.

[0006] The technical solution of the application is:

[0007] The application discloses a phase change energy storage superstructure with high efficient heat exchange, which comprises a shell, a plurality of superstructure units are connected in the shell, the superstructure unit comprises a cylinder and a four-sided pyramid connected to one end of the cylinder, the tip of the four-sided pyramid is connected to the cylinder, the axis of the cylinder is perpendicular to the bottom surface of the four-sided pyramid, the cylinder is perpendicular to the plane where the shell is located, and the bottom surface of the four-sided pyramid is connected to the same side in the shell.

[0008] The diameter D of the cylinder is determined according to the width T of the four-sided pyramid, D >= T / 3, and the minimum size is 0.8 mm; the height H2 of the four-sided pyramid and the height H1 of the cylinder are added to obtain H.

[0009] The relationship between the side length T of the bottom surface of the four-sided pyramid and the diameter D of the cylinder is D >= T / 3.

[0010] The height H2 of the four-sided pyramid is <= 2D.

[0011] The superstructure units are uniformly arranged in the shell, and the adjacent four-sided pyramids are densely arranged, that is, the adjacent four-sided pyramids are in contact.

[0012] The shell and the superstructure unit are integrally formed through an additive process.

[0013] Two powder outlets are arranged on the side surface of the shell and used for discharging the powder generated in the additive forming process.

[0014] The four-sided pyramid connected to one side of the shell is a heat exchange reinforcing side of the shell; and the heat exchange reinforcing side of the shell is connected to a heating device, so that the heat transfer between the heating device and the phase change energy storage superstructure is improved.

[0015] An additive process method of a phase change energy storage superstructure with high efficient heat exchange comprises

[0016] S1: obtaining the sizes of the phase change energy storage superstructure according to the heat storage and structure bearing requirements;

[0017] S2: slicing the phase change energy storage superstructure with the known sizes to obtain a slicing file, inputting the slicing file into a printing device to print a part on a substrate;

[0018] S3: fixing the part and the substrate to a vibration powder cleaning table to remove the residual powder in the part through long time vibration; then, the powder outlet is blocked, the surface of the part is polished and machined, and the inside of the part is polished to obtain a machined part;

[0019] S4: performing a leak detection experiment on the machined part to ensure that the part is defect-free, and filling the phase change energy storage plate phase change working medium from the powder outlet; the powder outlet is welded and blocked, and then the surface is polished.

[0020] When performing layered slicing on the phase change energy storage superstructure: the shell of the phase change energy storage superstructure is horizontal, the cylinder of the superstructure unit of the phase change energy storage superstructure is vertical, and the tetrahedron is located at the top of the cylinder; the phase change energy storage superstructure is divided into multiple horizontal slices through the horizontal plane to obtain the slice file.

[0021] Through the design of a high-load-bearing-heat-exchange integrated superstructure under process constraints, the additive manufacturing dimension design of the superstructure unit, the overall structural form design of the energy storage device, and the realization of the designed parts printing and powder cleaning, internal polishing, filling and welding, a phase change energy storage superstructure with high phase change working fluid filling capacity, high heat exchange efficiency and high strength is obtained.

[0022] In summary, this application includes at least the following beneficial technical effects:

[0023] (1) Meets the requirements for lightweight and high load-bearing capacity;

[0024] (2) It has both rapid heat exchange and efficient heat storage functions;

[0025] (3) Considering the characteristics of additive manufacturing process, it has the ability to complete product design and manufacturing process. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the outer shell of the load-bearing-heat-exchange superstructure described in this invention.

[0027] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the load-bearing heat exchange superstructure described in this invention, and a three-view drawing of a single cell.

[0028] Figure 3 Schematic diagram of a load-bearing heat exchange superstructure unit.

[0029] Figure 4 This indicates the orientation for printing.

[0030] Explanation of reference numerals in the attached drawings: 1. Shell; 2. Mounting hole; 3. Superstructure array; 4. Superstructure unit; 5. Tetrahedron; 6. Cylinder. Detailed Implementation

[0031] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0032] This application discloses a phase change energy storage superstructure with high-efficiency heat exchange, such as... Figure 1 As shown, it includes a shell 1, and multiple superstructure units 4 are connected inside the shell 1.

[0033] The superstructure unit 4 comprises a cylinder 6 and a four-sided pyramid 5 connected to one end of the cylinder 6, the tip of the four-sided pyramid 5 is connected to the end of the cylinder 6, the axis of the cylinder 6 is perpendicular to the bottom surface of the four-sided pyramid 5, the cylinder 6 is perpendicular to the plane in which the shell 1 is located, and the bottom surfaces of the four-sided pyramids 5 of all superstructure units 4 are connected to the same side in the shell 1. The superstructure units 4 are uniformly arranged in the shell 1, and the adjacent four-sided pyramids 5 are densely arranged.

[0034] As shown in Figure 2 and Figure 3 , the diameter D of the cylinder 6 is determined according to the width T of the four-sided pyramid, D≥T / 3, and the minimum size is 0.8mm; the sum of the height H2 of the four-sided pyramid 5 and the height H1 of the cylinder 6 is H. The relationship between the side length T of the bottom surface of the four-sided pyramid 5 and the diameter D of the cylinder 6 is: D≥T / 3. The height H2 of the four-sided pyramid 5 is ≤2D.

[0035] The shell 1 and the superstructure unit 4 are integrally formed by an additive process. The side surface of the shell 1 is provided with two powder outlets for discharging the powder generated in the additive forming process and charging the phase change working medium. The shell is also provided with a mounting hole 2 for connecting and fixing the phase change energy storage superstructure to a specific position.

[0036] The four-sided pyramid 5 connected to one side of the shell 1 is the heat exchange strengthening side of the shell 1; the heat exchange strengthening side of the shell 1 is connected to the heat generating equipment to improve the heat transfer between the heat generating equipment and the phase change energy storage superstructure. Generally, there are two installation forms of the phase change energy storage superstructure, one is bearing installation, and the other is non-bearing installation. The non-bearing installation is that the heat exchange strengthening side of the phase change energy storage superstructure is connected to the heat generating equipment, the other side is not directly connected to the equipment, and does not bear the force. The bearing installation is that the phase change energy storage superstructure is connected between the heat generating equipment and …, both sides of the phase change energy storage superstructure are under stress, and the heat exchange strengthening side of the phase change energy storage superstructure is connected to the heat generating equipment. Through the design of the phase change energy storage superstructure, the phase change energy storage superstructure can have strong heat exchange capacity under the bearing installation and the non-bearing installation, and can bear a large load.

[0037] An additive process method of a phase change energy storage superstructure with high-efficiency heat exchange, comprising:

[0038] Step (1): High-bearing-heat exchange integrated superstructure design under process constraints

[0039] For a high-efficiency bearing-heat exchange superstructure with a size of hundreds of millimeters, a laser selective melting forming technology is selected for manufacturing; according to the process constraints of the laser selective melting forming technology, the maximum and minimum sizes of the vertebral body and the rod diameter of the bearing-heat exchange superstructure unit, the maximum number of unit arrays, and the minimum wall thickness of the shell 1 are determined.

[0040] Step (2): superstructure unit additive manufacturing size design and verification

[0041] The bearing-heat exchange superstructure unit 4 has a cylindrical part with a height of H1 and a diameter of D, and a four-sided pyramid part with a height of H2 and a base width of T. The bearing-heat exchange superstructure units 4 are uniformly arranged inside the shell 1 to form a bearing-heat exchange superstructure array 3. The surface defects of the printed unit structure and the upper plane support are observed to determine the optimal size of the unit structure.

[0042] Step (3): energy storage device overall structure form design

[0043] The outside is a shell 1 with uniform thickness, and the length, width, and height are denoted as L, W, and T, respectively. The values of L, W, and T are determined according to the size requirements of the high-bearing-heat exchange integrated superstructure. The inside of the shell 1 is formed into a three-dimensional grid structure using bearing-heat exchange superstructure units, which meets the requirements of external sealing, internal communication, improved structural bearing capacity, increased contact area, and lightweight.

[0044] Step (4): macroscopic model simulation verification

[0045] According to the design requirements of the structure size in steps 1-3, a macroscopic structure model is established, and the finite element analysis technology is used to calculate the structural mechanical response and heat exchange capacity of the macroscopic structure model under the reserved ventilation opening.

[0046] Step (5): part printing and powder cleaning processing

[0047] The model is sliced and filled with corresponding forming parameters. As shown in the following table, the specific steps include: Figure 4 The phase change energy storage superstructure is divided into multiple horizontal slices by a horizontal plane, and the corresponding light spot compensation is set to control the internal dot array size and the external polishing allowance, and the slice file is obtained.

[0048] The corresponding slice file is transmitted to the equipment for printing, and the printed part on the substrate is obtained.

[0049] The part is fixed on the vibration powder cleaning table together with the substrate, and the residual powder inside the part is removed by long-time vibration. Then the powder outlet is sealed, and the part surface is polished and machined.

[0050] Step (7): internal polishing, filling, and plugging

[0051] Adopt the abrasive grain flow and the electrolytic polishing technology, improve the internal structure's internal surface quality, and realize the removal of the excess. Complete the leak detection experiment, ensure that the part is defect-free. Perform energy storage plate phase change working fluid filling. Weld the filling port (powder outlet) and then perform surface grinding.

[0052] The content not described in detail in the specification of the present application belongs to the technology known to the person skilled in the art.

[0053] Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be defined by the scope of the claims of the present application.

Claims

1. A phase change energy storage superstructure with high efficiency heat exchange, characterized in that: The application relates to a phase change energy storage superstructure, which comprises a shell (1), a plurality of superstructure units (4) are connected in the shell (1), the superstructure unit (4) comprises a cylinder (6) and a four-sided pyramid (5) connected to one end of the cylinder (6), the tip of the four-sided pyramid (5) is connected to the cylinder (6), the axis of the cylinder (6) is perpendicular to the bottom surface of the four-sided pyramid (5), the cylinder (6) is perpendicular to the plane where the shell (1) is located, and the bottom surface of the four-sided pyramid (5) is connected to the same side in the shell (1). The relationship between the side length T of the bottom surface of the four-sided pyramid (5) and the diameter D of the cylinder (6) is D>=T / 3. The height H2 of the four-sided pyramid (5) is less than or equal to 2D. The side of the four-sided pyramid (5) connected to the shell (1) is a heat exchange strengthening side of the shell (1); and the heat exchange strengthening side of the shell (1) is connected to a heat generating device, so as to improve the heat transfer between the heat generating device and the phase change energy storage superstructure.

2. The phase change energy storage superstructure with high efficiency heat exchange according to claim 1, characterized in that: The minimum size of the diameter D of the cylinder (6) is 0.8mm; the sum of the height H2 of the four-sided pyramid (5) and the height H1 of the cylinder (6) is H, and H is the thickness of the inside of the shell (1).

3. The phase change energy storage superstructure with high efficiency heat exchange according to claim 1, characterized in that: The superstructure units (4) are uniformly arranged in the shell (1), and adjacent four-sided pyramids (5) are densely arranged, that is, the adjacent four-sided pyramids (5) are in contact.

4. The phase change energy storage superstructure with high efficiency heat exchange according to claim 1, characterized in that: The shell (1) and the superstructure unit (4) are integrally formed through an additive process.

5. The phase change energy storage superstructure with high efficiency heat exchange according to claim 4, characterized in that: Two powder outlets are arranged on the side surface of the shell (1) and used for discharging the powder generated in the additive forming process.

6. An additive process method of phase change energy storage superstructure with high efficiency heat exchange as claimed in any one of claims 1 to 5 wherein, The application further discloses a method for manufacturing the phase change energy storage superstructure. S1: obtaining the sizes of the phase change energy storage superstructure according to the heat storage and structure bearing requirements; S2: slicing the phase change energy storage superstructure with the known sizes, obtaining a slicing file, inputting the slicing file into a printing device to print a part on a substrate; S3: fixing the part and the substrate to a vibration powder cleaning table, cleaning the residual powder in the part through long-time vibration, then plugging the powder outlets, polishing and machining the surface of the part, and polishing the inside of the part to obtain a machined part; S4: carrying out a leakage detection experiment on the machined part to ensure that the part is defect-free, filling the phase change working medium into the powder outlets, welding the powder outlets, and then polishing the surface.

7. An additive process method of phase change energy storage superstructure with high efficiency heat exchange as claimed in claim 6 wherein: When the phase change energy storage superstructure is sliced, the shell (1) of the phase change energy storage superstructure is horizontal, the cylinder (6) of the superstructure unit (4) of the phase change energy storage superstructure is vertical, and the four-sided pyramid (5) is located on the top of the cylinder (6); The phase change energy storage superstructure is divided into a plurality of horizontal slices through a horizontal plane to obtain a slicing file.

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