CN113720193B - Material increase manufacturing-oriented alveolus bionic super heat exchanger structure and preparation method thereof - Google Patents
Material increase manufacturing-oriented alveolus bionic super heat exchanger structure and preparation method thereof Download PDFInfo
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- CN113720193B CN113720193B CN202110925587.7A CN202110925587A CN113720193B CN 113720193 B CN113720193 B CN 113720193B CN 202110925587 A CN202110925587 A CN 202110925587A CN 113720193 B CN113720193 B CN 113720193B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/38—Process control to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses an alveolar bionic super heat exchanger structure for additive manufacturing and a preparation method thereof. The invention realizes the preparation of the alveolar bionic super heat exchanger facing the additive manufacturing technology, obtains the alveolar bionic super heat exchanger structure, has the characteristics of high-efficiency heat exchange, compact structure and high damage resistance strength, has strong designability and flexible preparation, and has wide application prospect in the fields of aerospace, ships, high-end equipment and national defense and military.
Description
Technical Field
The invention belongs to the technical field of fluid heat exchange, and particularly relates to an alveolar bionic super heat exchanger structure for additive manufacturing and a preparation method thereof.
Background
The heat exchanger is a universal device in many traditional industrial departments, is commonly used in petroleum, chemical industry, power and the like, and occupies an important position in daily production and life. Conventional heat exchanger formats include dividing wall, hybrid and regenerative. The conventional heat exchanger has the following disadvantages: the heat exchanger has small heat exchange area and poor heat exchange effect, is suitable for being used in places with small space such as families, and for places with large space such as factory buildings, a large number of heat exchangers need to be installed to meet the use requirement, so that the investment is large, and more production space is occupied by the heat exchangers and connecting pipelines; if the heat exchange efficiency of the traditional tubular heat exchanger is improved, the most direct method is to use copper with higher cost, the heat conductivity is greatly improved, and in consideration of cost performance, stainless steel with low cost is still used in common occasions.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an alveolar bionic super heat exchanger structure for additive manufacturing and a preparation method thereof aiming at the defects in the prior art, so that the heat exchange area of internal fluid is increased and the heat exchange efficiency is improved on the premise of not changing the used material and not increasing the occupied space of the heat exchanger; the manufacturing of the inner pipeline is easily realized by using an additive manufacturing technology; the origami structure is introduced, so that the structural strength of the heat exchanger is greatly improved, and the origami structure can be applied to the fields of chemical industry, vehicles and aerospace.
The invention adopts the following technical scheme:
towards material increase manufacturing's bionical super heat exchanger structure of alveolus, including super heat exchanger structure core, the upper and lower both sides correspondence of super heat exchanger structure core is connected with top panel and lower panel, and super heat exchanger structure core includes a plurality of super heat exchanger structure unit cells, and a plurality of super heat exchanger structure unit cells cycle is arranged between top panel and lower panel, all sets up between super heat exchanger structure core and top panel and the lower panel and waits to cool off the liquid.
Specifically, the super heat exchanger structure core comprises a first super heat exchanger pipeline and a second super heat exchanger pipeline which are mutually staggered and not communicated, and liquid to be cooled is injected into the first super heat exchanger pipeline and the second super heat exchanger pipeline.
Furthermore, the inner surfaces and the outer surfaces of the first super heat exchanger pipeline and the second super heat exchanger pipeline, and the inner surfaces of the upper panel and the lower panel are provided with anticorrosive coatings.
Furthermore, the thickness of the anticorrosive coating is 0.2-0.5 mm.
Specifically, the pipeline shape of the super heat exchanger structure unit cell is an artificial alveolus-shaped curved tube.
Specifically, each super heat exchanger structural unit cell comprises three cross pipelines, and the curvatures of two ends and the center of each cross pipeline are adjustable.
Furthermore, the included angle between the three crossed pipes is 120 degrees.
Furthermore, the angle between the three crossed pipelines and the vertical direction is 0-90 degrees.
Specifically, the upper panel and the lower panel are both single-layer panels.
The invention also provides a preparation method of the material additive manufacturing-oriented alveolar bionic super heat exchanger structure, which comprises the following steps:
s1, determining adjustable geometric parameters of the material additive manufacturing-oriented alveolar bionic super heat exchanger structure, drawing a three-dimensional data model of the super heat exchanger structure, converting the three-dimensional data model into STL format data and exporting the STL format data, wherein the related adjustable geometric parameters comprise the curvature of two ends and the center of a pipeline in the super heat exchanger unit cell structure, an included angle between the pipeline and the vertical direction, and the length and the thickness of the pipeline;
s2, carrying out digital cross section slicing on the data model of the STL format data obtained in the step S1 to obtain slice data of the three-dimensional data model;
s3, determining 3D printing process parameters, selecting nickel-based alloy spherical powder, aluminum alloy spherical powder, stainless steel spherical powder or ceramic powder with adjustable laser power of 70-350W and scanning speed of 900-1500 mm per second, performing 3D layer-by-layer printing according to the slice data of the three-dimensional data model obtained in the step S2 to obtain an alveolar bionic super heat exchanger structure facing the additive manufacturing technology, wherein the 3D printing is performed by selective laser melting, selective laser sintering or electron beam melting.
Compared with the prior art, the invention has at least the following beneficial effects:
the utility model provides a towards material increase manufacturing's bionical super heat exchanger structure of alveolus, is equipped with the multilayer pipeline of arranging between top panel and the lower panel, and the one deck unit cell pipeline of crisscross arrangement establishes to a whole, for the one deck heat transfer, and the user can set up specific heat transfer number of piles as required. The pipelines are in a staggered relationship, and are not overlapped and connected. The cooling liquid is treated in the injection between super heat exchanger pipeline and upper panel and the lower panel, can realize that multiple liquid carries out the heat exchange simultaneously, and heat transfer area is big, and the heat transfer effect is showing and is improving, is particularly suitable for the big place in space to use, need not the higher metal copper of use cost and just can realize high-efficient heat transfer, adopts the vibration material disk technique to make for the complex construction of heat exchanger can be complete to be realized, and production cycle is short, can drop into to use fast.
Furthermore, the super heat exchanger is designed into two layers of pipelines which are mutually staggered and not communicated, so that the types of the liquid to be cooled can be increased, and two different cooling liquids can circulate in the pipelines without mixing; in practical application, if the radiator is subjected to external load, the two staggered layers of pipelines can be mutually supported in the bearing process, so that the damage resistance is enhanced.
Furthermore, an anti-corrosion coating is additionally arranged on the inner surface and the outer surface of the radiator pipeline, so that the corrosion of media such as cooling liquid, air and the like to the pipeline is avoided, and the pollution of the cooling liquid is avoided; meanwhile, the anti-corrosion coating also plays a role in protecting the surface of the pipeline and prolonging the service life of the radiator.
Furthermore, under the conditions of a strong corrosion environment and a liquid temperature not higher than 40 ℃, the thickness of the anticorrosive coating is not less than 0.1mm, and the temperature of the liquid to be cooled is probably far higher than 40 ℃ when the anticorrosive coating is considered to be thickened properly, and the thickness is 0.2-0.5 mm.
Furthermore, the used alveolus bionic structure is combined with the Origami structure, so that the shearing strength of the heat exchanger is greatly improved, the heat exchanger can have higher strength when being damaged by external force, the alveolus structure in a human body is simulated, the compactness of the heat exchanger structure is ensured while the heat exchange area is increased, and the occupied space cannot be increased.
Furthermore, the number of the unit cells and the unit cell assembly mode can be flexibly selected, and the unit cells can be assembled into specific geometric shapes according to actual production requirements, so that the application space is wider.
Furthermore, the purpose or benefit of setting the included angle between every two included angles of the crossed pipelines to be 120 degrees enables the unit cell to be centrosymmetric, the bearing is uniform, and the pressure resistance is stronger.
Furthermore, the curvature of two ends and the center of a pipeline in the super heat exchanger unit cell structure, the included angle between the pipeline and the vertical direction, the length and the thickness of the pipeline and the like are adjustable parameters, and the super heat exchanger unit cells with different sizes can be subjected to gradient design and combination by changing various size-adjustable parameters of the basic unit cell, so that the controllable heat exchange efficiency is realized, the flexibility is strong, and the designability of the structural performance is improved.
Furthermore, compared with the existing structure, the structure designed by the invention has better mechanical property, and the compression simulation result of the structure of the invention shows that the relative density of the 45-degree structure designed by the invention is 12.8%, the compression strength is 86.5MPa, compared with the existing structure made of the same material and with similar relative density, the compression strength is higher than 332.5%, the relative density of the 60-degree structure designed by the invention is 19.9%, the compression strength is 203.75MPa, and compared with the existing structure made of the same material and with similar relative density, the compression strength is higher than 299.5%. It can be seen from the above that the heat exchanger structure designed by the invention has great advantages in mechanical properties compared with the existing structure.
The invention also discloses a preparation method of the alveolar bionic super heat exchanger facing the additive manufacturing technology, which adopts a 3D printing technology to realize integrated molding of the structure, so that the alveolar bionic super heat exchanger facing the additive manufacturing technology can realize complex configuration design and adjustment, the design and the flexibility are enhanced, the preparation steps are simplified, the labor and the time are saved, meanwhile, the interface connection strength between a super heat exchanger pipeline and an upper panel and a lower panel is avoided, the risk and the complex multi-process circulation are reduced, the 3D printing can adopt various 3D printing manufacturing technologies such as laser selective melting (SLM), laser selective sintering (SLS), Electron Beam Melting (EBM) and the like, and the flexibility and the selectivity are strong; 3D prints powder raw materials and chooses for use in a flexible way, can full play material advantage and then promote the structural performance.
In conclusion, the invention realizes the preparation of the alveolar bionic super heat exchanger facing the additive manufacturing technology, obtains the alveolar bionic super heat exchanger structure, has the characteristics of high-efficiency heat exchange, compact structure and high damage resistance, has strong designability and flexible preparation, and has wide application prospect in the fields of aerospace, ships, high-end equipment and national defense and military.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a side view of a heat exchanger of the present invention with the face plate removed;
FIG. 2 is a top view of the heat exchanger of the present invention with the face plate removed;
FIG. 3 is a schematic diagram of a pseudo-alveolar unit cell structure of the heat exchanger of the present invention, wherein (a) is a top view of the unit cell structure and (b) is a side view of the unit cell structure;
FIG. 4 is a schematic structural diagram of an embodiment of a heat exchanger of the present invention, wherein (a) is a side view of the embodiment, and (b) is a top view of the embodiment;
FIG. 5 is a stress-strain curve exhibited by a heat exchanger unit cell subjected to a compressive load according to the present invention.
Wherein: 1. an upper panel; 2. a lower panel; 3. a super heat exchanger core; 4. an anti-corrosion coating; 5. a first super heat exchanger conduit; 6. a second super heat exchanger conduit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The invention provides an alveolar bionic super heat exchanger structure oriented to additive manufacturing. The structure is modeled by commercial software and is digitally sliced, and finally the commercial software is guided into a 3D printer to be integrally formed, so that the super heat exchanger structure is obtained. The invention realizes the preparation of the alveolar bionic super heat exchanger facing the additive manufacturing technology to obtain the alveolar bionic super heat exchanger structure, has the characteristics of high-efficiency heat exchange, compact structure and high damage resistance strength, has strong designability and flexible preparation, and has wide application prospect in the fields of aerospace, ships, high-end equipment and national defense and military.
Referring to fig. 1 and fig. 2, the present invention relates to an additive manufacturing oriented alveolar bionic super heat exchanger structure, which includes an upper panel 1, a lower panel 2 and a super heat exchanger structure core 3; the super heat exchanger structure core 3 comprises a plurality of super heat exchanger structure unit cells which are periodically arranged between an upper panel 1 and a lower panel 2; the upper panel 1 and the lower panel 2 are single-layer panels and are connected with the middle super heat exchanger structure core body 3, and the whole structure is integrally formed by adopting a 3D printing technology.
After different numbers of super heat exchanger unit cells are combined, heat exchanger structures with different geometric shapes, such as hexagons, parallelograms and the like can be formed, the super heat exchanger unit cells with different sizes can be subjected to gradient design and combination by changing various size-adjustable parameters of the basic unit cells, and controllable heat exchange efficiency is achieved.
The super heat exchanger structure core 3 comprises a first super heat exchanger pipeline 5 and a second super heat exchanger pipeline 6 which are mutually staggered and not communicated, and liquid to be cooled is injected into the first super heat exchanger pipeline 5 and the second super heat exchanger pipeline 6.
The liquid to be cooled in the first super heat exchanger pipe 5 and the second super heat exchanger pipe 6 is different from the liquid to be cooled between the upper panel and the lower panel, and the heat exchanger can accommodate three different cooling liquids at most for heat exchange.
The upper panel 1 and the lower panel 2 can be adjusted in position according to actual requirements to adapt to the shape of the heat exchanger; the liquid to be cooled can be injected between the upper panel 1 and the lower panel 2, and the heat exchange of a plurality of liquids can be realized simultaneously.
The inner and outer surfaces of the first super heat exchanger pipeline 5 and the second super heat exchanger pipeline 6 and the inner surfaces of the upper panel 1 and the lower panel 2 are respectively attached with an anticorrosive coating 4, and the thickness of the anticorrosive coating 4 is 0.2-0.5 mm.
Referring to fig. 3, the pipeline of the single unit of the super heat exchanger structure is an artificial alveolus-shaped curved pipe, each single unit of the super heat exchanger structure core 3 includes three cross pipelines, and in the top view of the single unit of the super heat exchanger structure in the super heat exchanger structure core 3, an included angle between two adjacent pipelines in the three cross pipelines is 120 degrees; the curvatures of the two ends and the center of the three crossed pipelines can be adjusted, the curvatures of the two ends and the center of the pipelines can be adjusted according to actual requirements, and the heat exchange efficiency is changed; acute angles formed between the pipelines of the single-cell structure of the super heat exchanger and the vertical direction are the same and are 0-90 degrees; the length and thickness of the pipeline are adjustable.
Referring to fig. 4, a schematic structural diagram of an embodiment of an alveolar bionic super heat exchanger oriented to an additive manufacturing technology is shown, in the embodiment, a regular hexagon design is performed by using uniform-size unit cells, and in actual production and manufacturing, gradient design and combination can be performed on super heat exchanger unit cells with different sizes by changing parameters of various adjustable sizes of basic unit cells, so that controllable heat exchange efficiency is realized.
The invention relates to a preparation method of an alveolar bionic super heat exchanger structure facing an additive manufacturing technology, which comprises the following steps of firstly drawing a structural data model of the alveolar bionic super heat exchanger facing the additive manufacturing technology, then slicing the digital cross section of the data model to obtain slice data, guiding the slice data into a 3D printer, selecting metal powder raw materials according to conditions, and integrally processing and molding through the 3D printer to obtain the alveolar tissue structure-based alveolar bionic super heat exchanger structure facing the additive manufacturing, and the specific steps are as follows:
and S1, determining relevant adjustable geometric parameters of the alveolar bionic super heat exchanger structure according to specific needs and actual conditions, drawing a three-dimensional data model of the structure through commercial three-dimensional modeling software UG, converting the obtained three-dimensional data model into STL format data and exporting the STL format data. The relevant adjustable geometric parameters include but are not limited to the curvature of the two ends and the center of the pipeline in the single-cell structure of the super heat exchanger, the included angle between the pipeline and the vertical direction, the length and the thickness of the pipeline and the like;
s2, importing the STL format data obtained in the step S1 into commercial model subdivision software Cura, and carrying out digital cross section slicing on the data model to obtain slice data of the three-dimensional data model;
s3, formulating technological parameters of the 3D printer according to specific needs and actual conditions, setting the power of the adjustable laser to be between dozens of watts and hundreds of watts, setting the scanning speed to be between 900 and 1500 millimeters per second, selecting appropriate powder raw materials including but not limited to nickel-based alloy spherical powder IN718, aluminum alloy spherical powder AlSi10Mg, stainless steel spherical powder 17-4 PH, ceramic powder and the like, and guiding slice data of the three-dimensional data model obtained IN the step S2 into the 3D printer to be printed layer by layer to obtain the alveolar bionic super heat exchanger structure.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) And drawing a three-dimensional data model of the alveolar bionic super heat exchanger structure oriented to the additive manufacturing technology by using commercial three-dimensional modeling software UG. The side panel is a rectangular plate, the side length is 16.4mm, the height is 22.9mm, and the thickness is 1 mm; the geometric model of the super heat exchanger structure unit cell forming the core body part is shown in figure 2, the radius of the widest part at two ends of the pipeline is 4mm, the central curvature is 50mm, the included angle between the pipeline and the vertical direction is 45 degrees, the length of the pipeline is 20mm, and the thickness of the pipeline is 0.5 mm. And converting the drawn three-dimensional data model into STL format data and exporting the STL format data.
(2) Importing the STL format data obtained in the last step into commercial model subdivision software Cura, and carrying out digital cross section slicing on the three-dimensional data model to obtain slice data of the three-dimensional data model;
(3) and importing the slice data of the three-dimensional data model obtained IN the last step into a BLT S310 model 3D printer, adopting a laser selective melting (SLM)3D printing technology, taking IN718 metal powder as a raw material, enabling the laser power to be 75W when the epidermis layer is printed, enabling the scanning speed to be 800mm/S, enabling the laser power to be 305W when the epidermis layer is printed, enabling the scanning speed to be 960mm/S, and finally obtaining the alveolar bionic super heat exchanger structure facing the additive manufacturing technology.
Referring to fig. 5, the structure designed by the present invention has better mechanical properties than the existing structure, and the compression simulation result of the structure of the present invention shows that the relative density of the 45-degree structure designed by the present invention is 12.8%, and the compressive strength thereof is 86.5MPa, which is 332.5% higher than that of the existing structure with the same material and similar relative density, and the relative density of the 60-degree structure designed by the present invention is 19.9%, and the compressive strength thereof is 203.75MPa, which is 299.5% higher than that of the existing structure with the same material and similar relative density. It can be seen from the above that the heat exchanger structure designed by the invention has great advantages in mechanical properties compared with the existing structure.
In summary, the core body of the material-additive-manufacturing-oriented alveolar bionic super heat exchanger structure and the preparation method thereof provided by the invention comprises a plurality of super heat exchanger structure unit cells, each structure unit cell is composed of three cross pipelines, the human body alveolar structure is simulated, and the two layers of heat exchange pipelines are mutually staggered and not communicated with each other. The structure is modeled by commercial software and is digitally sliced, and finally the commercial software is guided into a 3D printer to be integrally formed, so that the super heat exchanger structure is obtained. The invention realizes the preparation of the super heat exchanger with the alveolar bionic structure facing the additive manufacturing, obtains the super heat exchanger structure imitating the alveolar, has the characteristics of high-efficiency heat exchange, compact structure and high damage resistance strength, has strong designability and flexible preparation, and has wide application prospect in the fields of aerospace, ships, high-end equipment and national defense and military.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. The material increase manufacturing oriented alveolus bionic super heat exchanger structure is characterized by comprising a super heat exchanger structure core (3), wherein the upper side and the lower side of the super heat exchanger structure core (3) are correspondingly connected with an upper panel (1) and a lower panel (2), the super heat exchanger structure core (3) comprises a plurality of super heat exchanger structure unit cells, the plurality of super heat exchanger structure unit cells are periodically arranged between the upper panel (1) and the lower panel (2), and liquid to be cooled is arranged between the super heat exchanger structure core (3) and the super heat exchanger structure core (3) as well as between the upper panel (1) and the lower panel (2);
the super heat exchanger structure core (3) comprises a first super heat exchanger pipeline (5) and a second super heat exchanger pipeline (6) which are mutually staggered and not communicated, and liquid to be cooled is injected into the first super heat exchanger pipeline (5) and the second super heat exchanger pipeline (6).
2. The additive manufacturing-oriented alveolar biomimetic super heat exchanger structure according to claim 1, wherein the inner and outer surfaces of the first and second super heat exchanger pipes (5, 6), and the inner surfaces of the upper and lower panels (1, 2) are provided with an anti-corrosion coating (4).
3. The additive manufacturing-oriented alveolar biomimetic super heat exchanger structure according to claim 2, wherein the thickness of the anticorrosive coating (4) is 0.2-0.5 mm.
4. The additive manufacturing-oriented alveolar biomimetic super heat exchanger structure according to claim 1, wherein the pipe shape of the super heat exchanger structure unit cell is an alveoloid-like curved pipe.
5. The additive manufacturing-oriented alveolar biomimetic super heat exchanger structure according to claim 1, wherein each super heat exchanger structure unit cell comprises three intersecting channels, and the curvatures of the two ends and the center of the three intersecting channels are adjustable.
6. The additive manufacturing oriented alveolar biomimetic super heat exchanger structure of claim 5, wherein an included angle between three intersecting conduits is 120 °.
7. The additive manufacturing-oriented alveolar biomimetic super heat exchanger structure according to claim 5, wherein the three intersecting channels form an angle of 0-90 ° with the vertical direction.
8. The alveolar biomimetic super heat exchanger structure oriented to additive manufacturing according to claim 1, wherein the upper panel (1) and the lower panel (2) are both single-layer panels.
9. A method of making an additive-manufacturing-oriented alveolar biomimetic super heat exchanger structure of claim 1, comprising the steps of:
s1, determining adjustable geometric parameters of the material additive manufacturing-oriented alveolar bionic super heat exchanger structure, drawing a three-dimensional data model of the super heat exchanger structure, converting the three-dimensional data model into STL format data and exporting the STL format data, wherein the related adjustable geometric parameters comprise the curvature of two ends and the center of a pipeline in the super heat exchanger unit cell structure, an included angle between the pipeline and the vertical direction, and the length and the thickness of the pipeline;
s2, carrying out digital cross section slicing on the data model of the STL format data obtained in the step S1 to obtain slice data of the three-dimensional data model;
s3, determining 3D printing process parameters, selecting nickel-based alloy spherical powder, aluminum alloy spherical powder, stainless steel spherical powder or ceramic powder with adjustable laser power of 70-350W and scanning speed of 900-1500 mm per second, performing 3D layer-by-layer printing according to the slice data of the three-dimensional data model obtained in the step S2 to obtain an alveolar bionic super heat exchanger structure facing the additive manufacturing technology, wherein the 3D printing is performed by selective laser melting, selective laser sintering or electron beam melting.
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