CN114838608A - Flexible flat heat pipe adopting gas-liquid integrated liquid absorption core and preparation method - Google Patents
Flexible flat heat pipe adopting gas-liquid integrated liquid absorption core and preparation method Download PDFInfo
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- CN114838608A CN114838608A CN202210262604.8A CN202210262604A CN114838608A CN 114838608 A CN114838608 A CN 114838608A CN 202210262604 A CN202210262604 A CN 202210262604A CN 114838608 A CN114838608 A CN 114838608A
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- heat pipe
- gas
- liquid
- pipe body
- flexible flat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
- F28D15/046—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure characterised by the material or the construction of the capillary structure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0241—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes the tubes being flexible
Abstract
The invention relates to a flexible flat heat pipe adopting a gas-liquid integrated wick and a preparation method thereof, wherein the flexible flat heat pipe comprises a heat pipe body which is enclosed by a flexible film and is provided with an inner cavity, the inner cavity of the heat pipe body is internally provided with the gas-liquid integrated wick, the gas-liquid integrated wick comprises a capillary structure and a plurality of supporting structures, the capillary structure is abutted against the bottom of the heat pipe body, and a liquid channel is formed by extending one end of the heat pipe body to the other end of the heat pipe body; a plurality of bearing structure intervals set up, every bearing structure one end rigid coupling in capillary structure, other end butt in heat pipe body top, and a plurality of bearing structure have improved the tensile and the compressive capacity of heat pipe for flexible dull and stereotyped heat pipe is buckling the use, and the risk that fatigue fracture and plastic deformation produced the fold can be avoided to the heat pipe body. The gaps among the plurality of supporting structures are communicated with each other to form a steam channel, so that the defect that an effective steam channel is difficult to manufacture on the surface of the flexible flat plate heat pipe shell in the prior art is overcome.
Description
Technical Field
The invention relates to the technical field of phase change heat transfer, in particular to a flexible flat heat pipe adopting a gas-liquid integrated liquid absorption core and a preparation method thereof.
Background
The rapid development of the flexible electronic equipment promotes the transformation of the phase change heat transfer device to the flexibility direction, and the manufacture of the light and thin phase change heat transfer device with high heat transfer performance and high bending fatigue life has great significance for solving the heat dissipation problem of the flexible electronic equipment.
The prior art flexible flat heat pipe mainly comprises two forms. One mode is to use multilayer wire mesh as a liquid absorption core, a polymer mesh with large pores is used as a steam channel on the liquid absorption core, the liquid absorption core and the steam channel are separated from each other, and the technical problem of large flow resistance caused by the fact that the horizontal wires of the polymer mesh obstruct the steam flow exists. In another form, vapor channels are formed in a relatively thick copper shell by chemical etching, and a wire mesh is used as a wick that is separate from the vapor channels. The heat pipe is less flexible due to the thicker copper layer of the copper shell.
If a flexible film is used as the case in order to secure the flexibility of the heat pipe, the thin thickness of the case makes it difficult to make an effective vapor passage on the surface thereof. Meanwhile, both sides of the shell of the flexible flat heat pipe bear tensile force and pressure respectively in the bending use process, and the thinner shell is in danger of generating wrinkles due to fatigue cracking and plastic deformation.
Disclosure of Invention
Aiming at the technical problems in the prior art, one of the purposes of the invention is as follows: the utility model provides an adopt flexible dull and stereotyped heat pipe of gas-liquid integral type imbibition core, have better intensity and the flexibility of preferred concurrently simultaneously, fatigue fracture and plastic deformation production fold when can avoiding buckling repeatedly.
Aiming at the technical problems in the prior art, the invention aims to provide the following components: the flexible flat heat pipe prepared by the method has good strength and flexibility, and can avoid fatigue cracking and plastic deformation from generating wrinkles during repeated bending.
In order to achieve the purpose, the invention adopts the following technical scheme:
a flexible flat heat pipe adopting a gas-liquid integrated liquid absorption core comprises a heat pipe body which is enclosed by a flexible film and is provided with an inner cavity, and the heat pipe body which is enclosed by the flexible film has better flexibility. The inner cavity of the heat pipe body is vacuumized and filled with working media, a gas-liquid integrated liquid absorption core is arranged in the inner cavity of the heat pipe body and comprises a capillary structure and a plurality of supporting structures, the capillary structure is abutted against the bottom of the heat pipe body, and a liquid channel is formed by extending one end of the heat pipe body to the other end of the heat pipe body; a plurality of bearing structure intervals set up, every bearing structure one end rigid coupling in capillary structure, other end butt in heat pipe body top, and a plurality of bearing structure have improved the tensile and the compressive capacity of heat pipe for flexible dull and stereotyped heat pipe is buckling the use, and the risk that fatigue fracture and plastic deformation produced the fold can be avoided to the heat pipe body of being made by flexible film. The gaps among the plurality of supporting structures are mutually communicated to form a steam channel, so that the defect that the effective steam channel is difficult to manufacture on the surface of the flexible flat heat pipe shell by chemical etching and mechanical processing in the prior art is overcome.
Further, the heights of the plurality of support structures are the same or are combined in a periodically distributed high-low gradient mode.
Further, the height of the support structure is 0.15-5 mm.
Furthermore, the diameter of the supporting structure and the distance between adjacent supporting structures are both single sizes or are respectively distributed in a gradient size combination way.
Furthermore, the diameter of the supporting structure is 0.1-1mm, and the distance between the adjacent supporting structures is 0.4-2 mm.
Further, a plurality of supporting structures are the support columns arranged in an array.
Further, the supporting structure is a porous structure or a solid structure, and the capillary structure is a fiber felt, a multilayer wire mesh, a woven belt or a composite structure formed by combining the multilayer wire mesh and the woven belt; the silk screen and the braided belt are made of copper, stainless steel, nylon, polytetrafluoroethylene or polypropylene; the fiber felt is made of carbon fiber, glass fiber or polypropylene fiber.
A preparation method of a flexible flat heat pipe adopting a gas-liquid integrated liquid absorption core comprises the following steps of enclosing a flexible film into a heat pipe body with an inner cavity;
fixedly arranging a plurality of supporting structures on the capillary structure at intervals to prepare a gas-liquid integrated liquid suction core;
the gas-liquid integrated liquid absorption core is arranged in the inner cavity of the heat pipe body, so that the capillary structure extends from one end of the heat pipe body to the other end of the heat pipe body to form a liquid channel, and gaps among the plurality of supporting structures are mutually communicated to form a steam channel;
and (3) filling working media into the inner cavity of the heat pipe body, vacuumizing, and sealing to prepare the flexible flat heat pipe.
Further, the height distribution of the plurality of support structures and the distance between adjacent support structures are adjusted to adjust the flexibility of the flexible flat heat pipe.
Further, the capillary structure and the supporting structure are connected in a high-temperature sintering, glue bonding or welding mode, or the supporting structure is directly manufactured on the surface of the capillary structure by adopting 3D printing and electrodeposition processes.
In summary, the present invention has the following advantages:
the tensile and compressive capacities of the heat pipe are improved through the multiple supporting structures, so that the heat pipe body can avoid the risk of generating wrinkles due to fatigue cracking and plastic deformation in the bending use process of the flexible flat heat pipe. The gaps among the plurality of supporting structures are communicated with each other to form a steam channel, so that the defect that an effective steam channel is difficult to manufacture on the surface of the flexible flat plate heat pipe shell in the prior art is overcome.
Drawings
FIG. 1 is a schematic view of a gas-liquid integrated wick structure having triangularly arranged support columns in accordance with the present invention.
FIG. 2 is a schematic diagram of a gas-liquid integrated liquid absorption core structure with supporting columns arranged in a triangular manner and a wire mesh woven belt capillary structure according to the invention.
FIG. 3 is a schematic diagram of a gas-liquid integrated wick structure with square-shaped arrays of gradient height support columns according to the present invention.
Fig. 4 is a schematic plane structure diagram of the flexible flat heat pipe of the present invention.
FIG. 5 is a diagram of a process for packaging a flexible flat heat pipe using a gas-liquid integrated wick in accordance with the present invention.
Description of reference numerals:
1-gas-liquid integrated liquid absorption core, 11-capillary structure, 111-wire mesh and 112-woven belt; 12-a support structure; 2-an aluminum plastic film shell; and 3-liquid injection pipe.
Detailed Description
Aiming at the limitation that chemical etching and machining are difficult to manufacture an effective steam channel on the surface of a flexible flat heat pipe shell in the prior art, the embodiment provides the gas-liquid integrated liquid absorption core 1, wherein a plurality of supporting structures 12 are manufactured on the surface of a capillary structure 11, so that the steam channel is formed in the gap of the supporting structures 12; further, this embodiment can conveniently make the ripple structure through the height and the interval of regulation and control bearing structure 12 to promote the flexibility of flat heat pipe, reduce heat pipe casing fatigue fracture and produce the risk of fold.
The present invention will be described in further detail below.
The first embodiment is as follows:
as shown in fig. 1 and 4, the gas-liquid integrated wick 1 having the support columns arranged in a triangular shape according to the present embodiment includes capillary structures 11 and support structures 12, the capillary structures 11 form liquid channels, and gaps between the support structures 12 communicate with each other to form vapor channels. The capillary structure 11 and the support structure 12 are connected by a sintering process. The capillary structure 11 is composed of 3 layers of 250-mesh copper wire mesh 111 with the thickness of 0.06mm, and the supporting structure 12 is a porous supporting column formed by sintering copper powder. The height of the support columns is 0.6mm, the diameter of each support column is 0.6mm, and the center distance between every two adjacent support columns is 1.6 mm. The specific manufacturing method of the gas-liquid integrated liquid absorption core 1 with the support columns arranged in a triangular shape in the embodiment is as follows:
(1) the die is manufactured by adopting a graphite plate, the size of the graphite plate is 200 x 100 x 10mm, array holes with the depth of 0.8mm and the diameter of 0.8mm are machined on the surface of the graphite plate by adopting a milling process, and the center distance between two adjacent holes is 1.6 mm.
(2) And uniformly filling the holes on the surface of the graphite mold with 200-mesh and 300-mesh copper powder, and cleaning the redundant copper powder on the surface of the mold by using a scraper.
(3) Cutting 3 copper wire meshes 111 of 250 meshes with the size of 200X 100mm, stacking the copper wire meshes regularly, covering the copper wire meshes on the surface of a graphite die filled with copper powder, and pressing the copper wire meshes with a graphite plate.
(4) Placing a plurality of graphite molds which are orderly stacked into a high-temperature sintering furnace, and adding mixed gas (95% N) 2 +5％H 2 ) Under the protection of (3), sintering at a high temperature (960 ℃ C.) for 30 minutes. And (3) removing the graphite mould after cooling in a protective atmosphere to obtain the gas-liquid integrated liquid absorption core 1.
The shrinkage phenomenon of the copper powder can occur in the sintering process, so the size of the holes on the surface of the graphite mold is designed to be slightly larger than the size of the finally obtained support pillar structure.
Example two:
as shown in fig. 2, this embodiment is different from the first embodiment in that a micro-groove structure is formed on the surface of a graphite mold to place a woven belt 112, and finally, a gas-liquid integrated wick 1 having a multi-layer wire mesh 111-woven belt 112 composite capillary structure 11 can be obtained. The method comprises the following specific steps:
(1) the die is manufactured by adopting a graphite plate, the size of the graphite plate is 200 x 100 x 10mm, array holes with the depth of 0.8mm and the diameter of 0.8mm are machined on the surface of the graphite plate by adopting a milling process, and the center distance between two adjacent holes is 1.6 mm. Meanwhile, a micro groove with the depth of 0.3mm and the width of 2mm is processed on the surface of the graphite plate. The position of the micro-groove is designed according to the size of the flexible flat heat pipe, and finally 2 braided belts 112 are respectively ensured to be positioned at the trisection points of the width of the flexible flat heat pipe.
(2) Placing a braided belt 112 in the micro-groove, covering 2 layers of 330-mesh copper wire meshes 111 on the surface of the mould, and then pressing by adopting a graphite plate; placing a plurality of graphite molds which are orderly stacked into a high-temperature sintering furnace, and adding mixed gas (95% N) 2 +5％H 2 ) Pre (650 deg.C) sintering for 30 minutes under protection of (2 deg.C). And removing the graphite mold after cooling in the protective atmosphere to obtain the composite capillary structure 11 of the silk screen 111 and the woven belt 112.
(3) And uniformly filling the holes on the surface of the graphite mold with 300-mesh and 500-mesh copper powder, and cleaning the surface of the mold and redundant copper powder in the micro-grooves by using a scraper. And then covering the presintered wire mesh 111-woven belt 112 composite capillary wick on the surface of the mould to ensure that the woven belt 112 is positioned in the micro-groove on the surface of the mould and is compacted by a graphite plate.
(4) Placing a plurality of graphite molds which are orderly stacked into a high-temperature sintering furnace, and adding mixed gas (95% N) 2 +5％H 2 ) Under the protection of (3), sintering at a high temperature (960 ℃ C.) for 30 minutes. And (3) removing the graphite mould after cooling in a protective atmosphere to obtain the gas-liquid integrated liquid absorption core 1.
Example three:
as shown in fig. 3, the present embodiment is different from the above embodiments in that: the heights of the support columns in the embodiment are uniformly distributed in a gradient manner, and the support columns are arranged in a square manner. The method comprises the following specific steps:
(1) cutting 2 pieces of 200X 100 mm-sized 250 mesh copper wire mesh 111 and 1 piece of 200X 100 mm-sized 330 mesh copper wire mesh 111, stacking 3 pieces of wire mesh 111, compacting with graphite plate, and mixing with mixed gas (95% N) 2 +5％H 2 ) And sintered at high temperature (960 c) for 30 minutes to obtain a porous wick.
(2) And flatly placing the sintered multilayer silk screen 111 in a powder bed, and then depositing and processing powder columns with the heights of 0.4mm and 0.6mm on the surface of the silk screen 111 by adopting a Selective Laser Melting (SLM) technology, wherein the diameters of the columns are 0.6mm, and the distance between every two adjacent columns is 1.6 mm.
(3) And after the deposition is finished, taking out the silk screen 111, and removing redundant powder to obtain the gas-liquid integrated liquid suction core 1 with the gradient height supporting structure 12.
Example four:
a method for manufacturing a flexible flat heat pipe by adopting a gas-liquid integrated liquid absorption core adopts a gas-liquid integrated liquid absorption core 1 and an aluminum-plastic film as a shell, and the flexible flat heat pipe is manufactured in a packaging mode. Firstly, the gas-liquid integrated liquid absorption core 1 and the aluminum-plastic film are cut into proper sizes according to the size requirement of the flexible flat heat pipe. In this embodiment, the capillary structure 11 of the gas-liquid integrated wick 1 is 3 layers of 250-mesh copper wire mesh 111 with a thickness of 0.06mm, the height of the support structure 12 is 0.6mm, the diameter of each support column is 0.6mm, and the center distance between two adjacent support columns is 1.6 mm. The wick size was 20 x 100 mm. The size of the aluminum-plastic film is 55 x 120mm, and the thickness of the aluminum-plastic film is 0.08 mm.
As shown in fig. 5, the flexible flat heat pipe adopting the gas-liquid integrated liquid absorption core 1 is packaged by the following steps:
the aluminum-plastic film is folded in half along the length direction, and the gas-liquid integrated liquid absorption core 1 is placed inside the aluminum-plastic film. Packaging three sides of the aluminum plastic film shell 2 by adopting a hot pressing process, wherein the hot pressing temperature is 150 ℃, and the pressure is 0.5 MPa; and a notch with the width of 2-3mm is reserved on one sealing edge so as to insert the liquid injection pipe 3. And inserting the liquid injection copper pipe into the notch and bonding and sealing by adopting glue. The working medium is poured through the liquid injection pipe 3, pure water is adopted as the working medium in the embodiment, and the pouring amount is 500 ul; and (3) putting the heat pipe to be vacuumized into ice water for freezing for 5min, vacuumizing to below 5Pa, and sealing the liquid injection pipe 3. And carrying out secondary hot pressing on the redundant part of the heat pipe shell and removing the redundant part to obtain the flexible flat heat pipe with the total thickness of about 0.9 mm.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides an adopt flexible dull and stereotyped heat pipe of gas-liquid integral type wick which characterized in that: the heat pipe comprises a heat pipe body which is enclosed by a flexible film and is provided with an inner cavity, the inner cavity of the heat pipe body is vacuumized and filled with working media, a gas-liquid integrated liquid absorption core is arranged in the inner cavity of the heat pipe body, the gas-liquid integrated liquid absorption core comprises a capillary structure and a plurality of supporting structures, the capillary structure is abutted against the bottom of the heat pipe body, and a liquid channel is formed by extending one end of the heat pipe body to the other end of the heat pipe body; a plurality of bearing structure intervals set up, and every bearing structure one end rigid coupling in capillary structure, the other end butt in heat pipe body top, and the clearance between a plurality of bearing structure communicates each other and forms steam channel.
2. The flexible flat heat pipe using the gas-liquid integrated wick according to claim 1, wherein: the heights of the plurality of supporting structures are the same or are combined in a periodically distributed high-low gradient mode.
3. The flexible flat heat pipe using the gas-liquid integrated wick according to claim 1, wherein: the height of the support structure is 0.15-5 mm.
4. The flexible flat heat pipe using the gas-liquid integrated wick according to claim 1, wherein: the diameter of the supporting structure and the distance between the adjacent supporting structures are both single sizes or are respectively distributed in a gradient size combination way.
5. The flexible flat heat pipe using the gas-liquid integrated wick according to claim 1, wherein: the diameter of the support structure is 0.1-1mm, and the distance between adjacent support structures is 0.4-2 mm.
6. The flexible flat heat pipe using the gas-liquid integrated wick according to claim 1, wherein: the support columns are arranged in an array mode through the plurality of support structures.
7. The flexible flat heat pipe using the gas-liquid integrated wick according to claim 1, wherein: the supporting structure is a porous structure or a solid structure, and the capillary structure is a fiber felt, a multilayer wire mesh, a woven belt or a composite structure formed by combining the multilayer wire mesh and the woven belt; the silk screen and the braided belt are made of copper, stainless steel, nylon, polytetrafluoroethylene or polypropylene; the fiber felt is made of carbon fiber, glass fiber or polypropylene fiber.
8. A preparation method of a flexible flat heat pipe adopting a gas-liquid integrated liquid absorption core is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
enclosing a flexible film into a heat pipe body with an inner cavity;
fixedly arranging a plurality of supporting structures on the capillary structure at intervals to prepare a gas-liquid integrated liquid suction core;
the gas-liquid integrated liquid absorption core is arranged in the inner cavity of the heat pipe body, so that the capillary structure extends from one end of the heat pipe body to the other end of the heat pipe body to form a liquid channel, and gaps among the plurality of supporting structures are mutually communicated to form a steam channel;
and (3) filling working media into the inner cavity of the heat pipe body, vacuumizing, and sealing to prepare the flexible flat heat pipe.
9. The method for manufacturing a flexible flat heat pipe using a gas-liquid integrated wick according to claim 8, wherein the method comprises the following steps: and adjusting the height distribution of the plurality of support structures and the distance between the adjacent support structures to adjust the flexibility of the flexible flat heat pipe.
10. The method for manufacturing a flexible flat heat pipe using a gas-liquid integrated wick according to claim 8, wherein the method comprises the following steps: the capillary structure and the supporting structure are connected in a high-temperature sintering, glue bonding or welding mode, or the supporting structure is directly manufactured on the surface of the capillary structure by adopting a 3D printing and electro-deposition process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210262604.8A CN114838608A (en) | 2022-03-17 | 2022-03-17 | Flexible flat heat pipe adopting gas-liquid integrated liquid absorption core and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210262604.8A CN114838608A (en) | 2022-03-17 | 2022-03-17 | Flexible flat heat pipe adopting gas-liquid integrated liquid absorption core and preparation method |
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| CN114838608A true CN114838608A (en) | 2022-08-02 |
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| CN202210262604.8A Pending CN114838608A (en) | 2022-03-17 | 2022-03-17 | Flexible flat heat pipe adopting gas-liquid integrated liquid absorption core and preparation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115406278A (en) * | 2022-09-02 | 2022-11-29 | 昆明理工大学 | Spiral support column-liquid absorption core integrated sintered vapor chamber and preparation method thereof |
| CN116625150A (en) * | 2023-07-21 | 2023-08-22 | 歌尔股份有限公司 | Flexible flat heat pipe, preparation method thereof and electronic equipment |
-
2022
- 2022-03-17 CN CN202210262604.8A patent/CN114838608A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115406278A (en) * | 2022-09-02 | 2022-11-29 | 昆明理工大学 | Spiral support column-liquid absorption core integrated sintered vapor chamber and preparation method thereof |
| CN116625150A (en) * | 2023-07-21 | 2023-08-22 | 歌尔股份有限公司 | Flexible flat heat pipe, preparation method thereof and electronic equipment |
| CN116625150B (en) * | 2023-07-21 | 2023-11-14 | 歌尔股份有限公司 | Flexible flat heat pipe, preparation method thereof and electronic equipment |
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