Composite wick with groove and lattice structure and preparation method of composite wick

Abstract

The invention discloses a composite liquid absorption core of a groove and lattice structure and a preparation method of the composite liquid absorption core, the composite liquid absorption core comprises a metal tube shell substrate and a composite liquid absorption core body, the composite liquid absorption core body comprises the groove, lattice ribs are arranged on the two sides of the groove, and structural units of the lattice ribs are of a cubic frame structure. The lattice ribs and the tube shell metal substrate are integrally formed through an additive manufacturing method. The manufacturing process is simple, by combining the channel structure and the lattice structure, the capillary pressure of the wick is improved, the flowing resistance of liquid backflow is reduced, the permeability is improved, the working performance of the wick is comprehensively improved, and therefore the heat transfer performance of the heat pipe is improved.

Description

Technical Field

[0001] This invention belongs to the field of heat pipe technology, and more specifically, relates to a composite liquid wick with a groove and lattice structure and its preparation method. Background Technology

[0002] A heat pipe is a heat dissipation device with high heat transfer efficiency, long-distance heat load transfer, and good isothermal properties, and is widely used in various fields. The wick structure is the key structure determining the capillary performance of a heat pipe. Grooved wicks exhibit good permeability during working fluid flow, but their weak capillary force makes it difficult to provide sufficient driving force to maintain working fluid circulation in some working environments. Conversely, lattice-structured wicks have excellent capillary performance, achieving efficient working fluid reflux, but their complex porous structure leads to lower permeability.

[0003] Chinese invention patent CN118031696A discloses a composite capillary heat pipe with insulated microchannels or microchannels. This patent uses a composite capillary heat pipe with insulated microchannels or microchannels to improve the heat transfer efficiency of the heat pipe. The patent mentions that no single capillary structure can simultaneously achieve high capillary force and permeability, and the contradiction between capillary force and permeability restricts the optimization of heat pipes. Summary of the Invention

[0004] This invention provides a composite wick with a groove and a lattice structure and its preparation method. By combining a groove structure with high permeability with a lattice structure with strong capillary force, the heat transfer efficiency of the heat pipe is improved, thereby solving the technical problem of the contradiction between permeability and capillary force in the wick in the prior art.

[0005] According to a first aspect of the present invention, a composite liquid-absorbing core with a groove and a lattice structure is provided, comprising a metal tube substrate and a composite liquid-absorbing core disposed on the metal tube substrate, wherein the composite liquid-absorbing core includes a groove and lattice ribs disposed on both sides of the groove, and the structural unit of the lattice ribs is a cubic frame structure.

[0006] Preferably, the cubic frame structure is composed of arranged cylindrical rods, which are connected at nodes to form a cubic hole. The side length of the cubic hole is 0.8 mm-1.2 mm, and the diameter of the cylindrical rod is 0.3 mm-1.0 mm.

[0007] Preferably, the width of the lattice rib is 1.3 mm to 8.0 mm.

[0008] Preferably, the groove depth is 1.3 mm to 8.0 mm.

[0009] Preferably, the groove width is 0.6 mm to 8.0 mm.

[0010] According to another aspect of the present invention, a method for preparing a composite absorbent core with groove and lattice structure is provided, comprising the following steps: S1: Create a 3D model of the composite absorbent core and obtain the STL format model file; S2: Import the STL format model file obtained in step S1 into the forming control device, slice the model, and obtain the contour information of the composite liquid absorption core. S3: Based on step S2, plan the scanning path and set the forming process parameters; S4: Use a scraper or powder spreading roller to spread a uniform layer of powder on the processing platform; S5: Based on the graphic slice information obtained in step S2 and the forming process parameters set in step S3, control the galvanometer to select the molten metal powder to form a metallurgical entity. S6: After the current layer is formed, the forming cylinder descends by the thickness of one layer, the powder feeding cylinder rises, and the manufacturing continues according to steps S4 and S5 until the composite liquid-absorbing core is obtained.

[0011] Preferably, in step S5, the metal powder is spherical aluminum alloy AlSi10Mg powder.

[0012] Preferably, the particle size of the aluminum alloy AlSi10Mg powder is 15 μm - 53 μm.

[0013] In summary, compared with the prior art, the above-described technical solutions conceived by this invention mainly possess the following technical advantages: (1) This invention proposes a composite wick heat pipe with groove and lattice structure and its manufacturing method. By combining the highly permeable groove structure with the strongly capillary lattice structure, the heat transfer efficiency of the heat pipe is improved.

[0014] (2) The composite wick heat pipe with groove and lattice structure in this invention breaks through the contradiction of high capillary force and low permeability or high permeability and low capillary force of traditional single wick, and has both high capillary pressure and excellent permeability.

[0015] (3) Traditional heat pipe processing requires multiple steps, while the laser selective melting (SLM) technology of this invention can directly manufacture integrated composite structures, greatly shortening the production cycle, and at the same time has a better forming effect for composite microstructures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the composite liquid absorption core structure of the present invention.

[0017] Figure 2This is a three-dimensional schematic diagram of the composite liquid absorption core of the present invention.

[0018] Figure 3 This is a physical image of the composite liquid-absorbing core of the present invention.

[0019] Figure 4 This is a microscopic observation image of the composite liquid absorption core of the present invention.

[0020] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-metal tube substrate, 2-lattice rib, 3-groove, 4-hole of cubic lattice structure, 5-rod of cubic lattice structure. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] The present invention relates to a composite liquid-absorbing core with groove and lattice structure, comprising a metal tube substrate 1 and a composite liquid-absorbing core with lattice structure. The composite liquid-absorbing core with lattice structure includes a groove 3, and the two sides of the groove 3 are lattice ribs 2. The structural unit of the lattice ribs 2 is a cubic frame structure.

[0023] This invention discloses a composite wicking structure with grooves and lattice structures and its manufacturing method. The heat pipe has a flat plate shape. The composite wicking mainly includes a tube shell metal substrate, lattice ribs and grooves. The lattice ribs and the tube shell metal substrate are integrally formed by additive manufacturing. The lattice rib structure and the groove structure are uniformly distributed on the substrate. During manufacturing, selective laser melting technology is used to integrally manufacture the heat pipe.

[0024] The method for preparing the composite liquid-absorbing core with groove and lattice structure of the present invention includes the following steps: S1: Modeling, creating a CAD model of the part to be processed, and obtaining an STL format file; S2: Slicing. Import the STL format model file obtained in step S1 into the forming control equipment, and use special software to slice the model to obtain the part contour information. S3: Based on step S2, plan the scanning path and set the forming process parameters; S4: Pre-powder, using a scraper or powder spreading roller to spread a uniform layer of powder on the processing platform; S5: Forming. Based on the graphic slice information obtained in step S2 and the forming parameters set in step S3, the galvanometer is controlled to select the molten metal powder to form a metallurgical bonded entity. S6: Spread powder again and scan with laser beam; after the current layer is formed, the forming cylinder descends by the thickness of one layer, the powder feeding cylinder rises a certain distance, and powder is spread again. Repeat steps S4 and S5 until the part processing is completed.

[0025] In some embodiments, the slice layer thickness in S2 is 20 μm; In some embodiments, the powder thickness in S4 is 0.1 mm; In some embodiments, the manufacturing process parameters are a laser beam power of 500 W, a spot diameter of 0.08 mm, and a scanning speed of 2000 mm / s.

[0026] The following are specific embodiments. Example 1 A schematic diagram of the composite liquid-absorbing core with groove and lattice structure of the present invention is shown below. Figure 1 and Figure 2 As shown. A three-dimensional schematic diagram of the composite liquid-absorbing core of the present invention is shown below. Figure 2 As shown. The composite liquid-absorbing core of this invention includes a metal tube-shell substrate 1 and a composite liquid-absorbing core with a lattice structure. The composite liquid-absorbing core with a lattice structure includes grooves 3, and lattice ribs 2 on both sides of the grooves 3. The structural unit of the lattice ribs 2 is a cubic frame structure. This study proposes a groove-lattice composite liquid-absorbing core structure, combining the high permeability characteristics of the groove liquid-absorbing core with the strong capillary performance of the lattice liquid-absorbing core. Compared with other groove structures, the rectangular groove structure has lower flow resistance, a larger flow cross-sectional area, and a simpler structure, making it easier to manufacture. Figure 1 As shown, this invention takes a rectangular channel as an example, combining the ribs of the rectangular channel with a lattice structure, and using the capillary force generated by the lattice structure to assist the recirculation of the working fluid, thereby significantly improving its capillary capacity without affecting its original permeability.

[0027] Example 2 The preparation method of the composite liquid-absorbing core with groove and lattice structure of the present invention is as follows: Selective laser melting (SLM) technology uses a high-energy laser beam as the energy source to melt the metal printing material. Following a pre-planned path in the 3D slicing model, it scans the metal powder bed layer by layer. The scanned metal powder melts and solidifies, achieving a metallurgical bond and ultimately obtaining the 3D metal part designed in the model. The raw material used in SLM manufacturing is aluminum alloy AlSi10Mg powder provided by Zhongrui Technology. The powder has a spherical morphology, a particle size of 15-53 μm, a particle size distribution of D10=20.94 μm, D50=38.45 μm, D90=64.84 μm, a flowability of 150 s, and a loose packing density of 1.45 g / cm³. The composite liquid-absorbing core is manufactured using the Zhongrui SLM280 metal 3D printer (SLM series). The manufacturing process parameters are: laser beam power of 500 W, spot diameter of 0.08 mm, scanning speed of 2000 mm / s, powder layer thickness of 0.10 mm, and defocusing amount of variable focus. The actual picture of the manufactured composite liquid absorption core is as follows Figure 3 As shown in Figure 4.

[0028] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A composite liquid-absorbing core with a groove and lattice structure, characterized in that, It includes a metal tube substrate (1) and a composite liquid-absorbing core disposed on the metal tube substrate (1). The composite liquid-absorbing core includes a groove (3) and lattice ribs (2) disposed on both sides of the groove (3). The structural unit of the lattice ribs (2) is a cubic frame structure.

2. The composite liquid-absorbing core with groove and lattice structure as described in claim 1, characterized in that, The cubic frame structure is composed of arranged cylindrical rods, which are connected at the nodes to form a cubic hole. The side length of the cubic hole is 0.8 mm-1.2 mm, and the diameter of the cylindrical rod is 0.3 mm-1.0 mm.

3. The composite liquid-absorbing core with groove and lattice structure as described in claim 1, characterized in that, The width of the lattice rib (2) is 1.3 mm to 8.0 mm.

4. The composite liquid-absorbing core with groove and lattice structure as described in claim 1, characterized in that, The groove (3) has a depth of 1.3 mm to 8.0 mm.

5. The composite liquid-absorbing core with groove and lattice structure as described in claim 1, characterized in that, The groove (3) has a width of 0.6 mm to 8.0 mm.

6. The method for preparing the composite absorbent core with groove and lattice structure as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: Create a 3D model of the composite absorbent core and obtain the STL format model file; S2: Import the STL format model file obtained in step S1 into the forming control device, slice the model, and obtain the contour information of the composite liquid absorption core. S3: Based on step S2, plan the scanning path and set the forming process parameters; S4: Use a scraper or powder spreading roller to spread a uniform layer of powder on the processing platform; S5: Based on the graphic slice information obtained in step S2 and the forming process parameters set in step S3, control the galvanometer to select the molten metal powder to form a metallurgical entity. S6: After the current layer is formed, the forming cylinder descends by the thickness of one layer, the powder feeding cylinder rises, and the manufacturing continues according to steps S4 and S5 until the composite liquid-absorbing core is obtained.

7. The method for preparing the composite liquid-absorbing core with groove and lattice structure as described in claim 6, characterized in that, In step S5, the metal powder is spherical aluminum alloy AlSi10Mg powder.

8. The method for preparing the composite liquid-absorbing core with groove and lattice structure as described in claim 7, characterized in that, The particle size of the aluminum alloy AlSi10Mg powder is 15 μm - 53 μm.

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