CN111076589A - Ultrathin heat pipe with gradient capillary core structure - Google Patents
Ultrathin heat pipe with gradient capillary core structure Download PDFInfo
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- CN111076589A CN111076589A CN201911305217.2A CN201911305217A CN111076589A CN 111076589 A CN111076589 A CN 111076589A CN 201911305217 A CN201911305217 A CN 201911305217A CN 111076589 A CN111076589 A CN 111076589A
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- side wall
- fiber bundle
- copper fiber
- heat pipe
- gradient
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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
- 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
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
Abstract
The invention relates to the field of heat pipe structures, and provides an ultrathin heat pipe with a gradient capillary core structure, which comprises a pipe body, wherein the pipe body comprises a middle side wall and an end side wall connected with the middle side wall; a copper fiber bundle capillary core is arranged on the side wall of the middle part; and a steam channel is formed among the middle side wall, the end side wall and the copper fiber bundle capillary wick, and a steam channel is formed among the middle side wall and the copper fiber bundle capillary wick. The ultrathin heat pipe has the advantages of strong capillary force, low flow resistance, good heat transfer effect, high mechanical strength and the like, can realize effective heat dissipation under high heat flow density, improves the heat dissipation effect of electronic devices, and improves the working performance of the electronic devices.
Description
Technical Field
The invention relates to the field of heat pipe structures, in particular to an ultrathin heat pipe with a gradient capillary core structure.
Background
With the trend of lighter, thinner, shorter and shorter product structures of 5G mobile phones, notebook computers, data centers, satellites, AI communication equipment and the like, processors develop towards higher speed and higher power, the problem caused by the heat productivity of the processors is increasingly serious, and higher requirements are put forward on equipment heat dissipation systems. For example, in 1G, 2G and 3G mobile phones, the heat production is low (<1W), the heat dissipation design requirement is very low, and the requirements can be met by adopting a metal plate and a heat conduction silica gel gasket. In 4G phones, with increased applications, chip miniaturization and faster processing speeds, and increased heat production (1-5W), graphite sheets and heat pipes are beginning to be applied to the phone's heat dissipation system. With the advent of the 5G era, the application of new materials is urgently needed, and the market of heat dissipation materials is also accompanied with the rapid development of the new materials. The heat production capacity of the 5G mobile phone is several times that of other mobile phones, the heat production capacity of a mobile phone chip reaches or exceeds 5W in the future, and an efficient heat dissipation design technology becomes one of the main problems to be solved urgently in the mobile phone communication technology. In the future 5G mobile phones, Ultra-thin Heat pipes (Ultra-thin Heat pipes) and Ultra-thin uniform Heat liquid cold plates (Ultra-thin Vapor chambers) are mainly adopted for efficient Heat dissipation.
The heat pipe is a heat radiator with high heat conducting property, and consists of pipe shell, liquid absorbing core and end cover. The vapor flows from the vapor channel to the condensation section of the heat pipe, condenses into liquid, and releases latent heat. Under the action of capillary force, the liquid flows back to the evaporation section, so that a closed cycle is completed, and a large amount of heat is transferred from the heating section to the heat dissipation section.
Due to the small volume and excellent heat dissipation performance, the ultrathin heat pipe and the ultrathin soaking liquid cold plate play an important role in future heat dissipation design. However, the design and development of the ultrathin heat pipe and the ultrathin soaking liquid cooling plate with the thickness of less than 0.4mm are still under exploration, and the performance of the ultrathin heat pipe and the ultrathin soaking liquid cooling plate has a huge improvement space.
Disclosure of Invention
The invention provides the ultrathin heat pipe with the gradient capillary core structure, which has the advantages of strong capillary force, low flow resistance, good heat transfer effect, high mechanical strength and the like, can realize effective heat dissipation under high heat flow density, improves the heat dissipation effect of electronic devices and improves the working performance of the electronic devices, aiming at the defects in the existing ultrathin heat pipe heat dissipation technology.
In order to achieve the technical purpose, the invention provides the following scheme:
the invention provides an ultrathin heat pipe with a gradient capillary core structure, which comprises a pipe body, wherein the pipe body comprises a middle side wall and an end side wall connected with the middle side wall; a copper fiber bundle capillary core is arranged on the side wall of the middle part; and a steam channel is formed among the middle side wall, the end side wall and the copper fiber bundle capillary wick, and a steam channel is formed among the middle side wall and the copper fiber bundle capillary wick.
As a preferable scheme of the invention, the copper fiber bundle capillary cores are arranged at intervals.
As a preferred aspect of the present invention, the middle side wall includes a first middle side wall and a second middle side wall; the end sidewalls include a first end sidewall and a second end sidewall; a first end of the first middle portion sidewall is connected to a first end of the first end portion sidewall; a second end of the first middle side wall is connected to a first end of the second end side wall; a first end of the second middle section sidewall is connected to a second end of the first end section sidewall; the second end of the second middle section sidewall is connected to the second end of the second end section sidewall.
As a preferable scheme of the invention, the copper fiber bundle capillary wick is connected with the first middle side wall and the second middle side wall.
In a preferred embodiment of the present invention, the middle sidewall and the end sidewalls are both straight tube walls.
As a preferable scheme of the invention, the height h of the copper fiber bundle capillary core is 0.1-0.24 mm.
In a preferred embodiment of the present invention, the height h of the copper fiber bundle wick is 0.24 mm.
In a preferable embodiment of the present invention, the width of the copper fiber bundle wick is 0.5-2.5 mm.
In a preferred embodiment of the present invention, the width of the copper fiber bundle wick is 1 mm.
In a preferred embodiment of the present invention, the thickness of the first middle sidewall, the thickness of the second middle sidewall, the thickness of the first end sidewall, and the thickness of the second end sidewall are all 0.06-0.1 mm.
In a preferred embodiment of the present invention, the thickness of the first middle sidewall, the thickness of the second middle sidewall, the thickness of the first end sidewall, and the thickness of the second end sidewall are all 0.08 mm.
In a preferred embodiment of the present invention, the sum H of the thickness of the first central portion side wall, the thickness of the second central portion side wall, and the height of the copper fiber bundle is 0.26 to 0.4 mm.
In a preferred embodiment of the present invention, a sum H of a thickness of the first central portion side wall, a thickness of the second central portion side wall, and a height of the copper fiber bundle is 0.4 mm.
As a preferable scheme of the invention, the distance between the end part side wall and the copper fiber bundle capillary core close to the end part is 1-3 mm.
In a preferable scheme of the invention, the distance between the end side wall and the copper fiber bundle capillary core close to the end is 1.5 mm.
As a preferable scheme of the invention, the distance between the copper fiber bundle capillary cores is 1.5-3.5 mm.
As a preferable scheme of the invention, the distance between the copper fiber bundle capillary cores is 2.5 mm.
In a preferred embodiment of the present invention, the copper fiber bundle wick is composed of first fibers and second fibers having different diameters arranged in layers or is composed of first fibers and second fibers having different diameters arranged in zones.
In a preferred embodiment of the present invention, the first fiber has a diameter of 0.04 to 0.06mm, and the second fiber has a diameter of 0.02 to 0.04 mm.
In a preferred embodiment of the present invention, the first fiber diameter is 0.05mm and the second fiber diameter is 0.03 mm.
The tube body of the ultrathin heat tube with the gradient capillary core structure provided by the invention adopts a microalloyed copper alloy material with high strength and high thermal conductivity, and the mechanical property of the tube wall material of the heat tube is improved under the condition of ensuring the high thermal conductivity of the tube body material. The alloy copper is used as the material of the heat pipe body, so that the pipe body can be prevented from sinking in the process of vacuumizing, the wall thickness of the heat pipe body is reduced, and the available space for the flow of water vapor and distilled water in the pipe is increased. The copper fiber capillary core is arranged on the inner wall of the ultrathin heat pipe, the capillary core is designed by adopting a fiber diameter gradient structure, the copper fiber bundle with a larger diameter is used for reducing the flow resistance, the copper fiber bundle with a smaller diameter is used for improving the capillary circulation power, and the heat transfer performance in the ultrathin heat pipe is greatly improved. Meanwhile, the hydrophilicity of the fiber material can be enhanced and the transport property of the fiber surface can be improved by fiber surface treatment such as a magnetron sputtering method or a chemical vapor deposition method. The capillary core block in the design can not only provide power for the circulation of a working medium (distilled water), but also support the pipe body, improve the mechanical strength of the pipe body and reduce the requirement of the thickness of the pipe wall. In addition, the heat and mass transfer effects of the capillary core can be further optimized and improved by optimizing the area ratio of the capillary core to the vapor channel, balancing the flow resistance and the capillary driving force. This design facilitates a linear expansion of the heat transfer effect by increasing the width without changing the thickness of the heat pipe, depending on the specific heat transfer requirements.
Drawings
Fig. 1 is a schematic structural diagram of an ultra-thin heat pipe provided in an embodiment of the present invention before forming.
Fig. 2 is a schematic structural diagram of the ultra-thin heat pipe provided in the first embodiment of the present invention after being formed.
Fig. 3 is a schematic cross-sectional structure of a copper fiber bundle.
Fig. 4 is a schematic cross-sectional structure of a copper fiber bundle.
Fig. 5 is a schematic structural diagram of an ultra-thin heat pipe according to a second embodiment of the present invention before forming.
Fig. 6 is a schematic structural diagram of the ultra-thin heat pipe provided in the second embodiment of the present invention after being formed.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples, which should not be construed as limiting the invention.
Example one
As shown in fig. 1 and fig. 2, the ultrathin heat pipe with a gradient capillary wick structure provided in this embodiment includes a pipe body 1, where the pipe body 1 includes a middle sidewall 11 and an end sidewall 12 connected to the middle sidewall.
Wherein, the pipe body 1 is a microalloyed copper pipe with high strength and high thermal conductivity, the diameter of which is 5mm and the thickness of the pipe wall of which is 0.4 mm. The middle side wall 11 and the end side walls 12 are both flat pipe walls.
The middle sidewall 11 includes a first middle sidewall 110 and a second middle sidewall 111, and the end sidewall 12 includes a first end sidewall 120 and a second end sidewall 121. A first end of the first middle sidewall 110 is connected to a first end of the first end sidewall 120, and a second end of the first middle sidewall 110 is connected to a first end of the second end sidewall 121. A first end of the second middle sidewall 111 is connected to a second end of the first end sidewall 120, and a second end of the second middle sidewall 111 is connected to a second end of the second end sidewall 121.
And the copper fiber bundle capillary wick 2 is arranged between the first middle side wall 110 and the second middle side wall 111. A steam channel 3 is formed between the middle side wall 11, the end side wall 12 and the copper fiber bundle capillary wick 2, and a steam channel 3 is formed between the middle side wall 11 and the copper fiber bundle capillary wick 2.
As shown in fig. 3 and 4, the copper fiber bundle provided by this embodiment has two arrangement structures, and is formed by arranging the first fibers 21 and the second fibers 22 with different diameters in a layered manner or the copper fiber bundle capillary wick 2 is formed by arranging the first fibers 21 and the second fibers 22 with different diameters in a partitioned manner. The copper fiber bundle with the larger diameter is used for reducing the flow resistance, the copper fiber bundle with the smaller diameter is used for improving the capillary circulation power, the heat transfer performance inside the ultrathin heat pipe is greatly improved, the capillary core is connected with the first middle side wall 110 and the second middle side wall 111, and meanwhile, the capillary core can support the pipe body, so that the requirement on the thickness of the pipe wall is reduced.
In addition, the height h of the copper fiber bundle capillary core 2 is 0.1-0.24mm, preferably 0.24 mm; the width of the copper fiber bundle capillary core 2 is 0.5-2.5 mm, preferably 1.0 mm; the thickness of the first middle sidewall 110, the thickness of the second middle sidewall 111, the thickness of the first end sidewall 120 and the thickness of the second end sidewall 121 are all 0.06-0.1mm, preferably 0.08 mm; the sum H of the thickness of the first middle side wall 110, the thickness of the second middle side wall 111 and the height of the copper fiber bundle capillary wick 2 is 0.26-0.4mm, and preferably 0.4 mm; the distance between the first end side wall 120 and the first end side wall 210 of the copper fiber bundle and the distance between the second end side wall 121 and the fourth end side wall 221 of the copper fiber bundle are both 1-3mm, preferably 1.5 mm; the distance between the second end side wall 211 of the copper fiber bundle capillary wick 2 and the third end side wall 220 of the copper fiber bundle capillary wick 2 is 1.5-3.5mm, preferably 2.5 mm; the first fibers 21 have a diameter of 0.04 to 0.06mm, preferably 0.05mm, and the second fibers 22 have a diameter of 0.02 to 0.04mm, preferably 0.03 mm.
In this embodiment, the tube body 1 is obtained by a round tube through processes of necking, filling copper fibers, sintering, necking, sealing, filling distilled water, vacuumizing, secondarily removing non-condensable gas, sealing, bending, flattening, forming and the like. In the process of shrinking the head, the diameter of the head end of the copper pipe which is cleaned by ultrasonic wave in advance needs to be shrunk to 2-3mm from 5 mm. In the process of filling the copper fiber, the copper fiber bundles which are washed in advance, arranged into bundles and cut to be 110mm long need to be inserted into the tube body by the aid of the ejector rods, so that the copper fiber is guaranteed to be well attached to the tube wall. In the sintering process, the raw materials are electrically sintered for a period of time in a high-temperature reduced-vacuum environment. In the tail shrinking process, the diameter of the tail end of the copper pipe needs to be shrunk to 2-3mm from 5 mm. In the tail sealing process, redundant pipes at the tail part need to be cut off, and the tail end of the heat pipe needs to be sealed and welded. In the process of filling distilled water, the distilled water without impurities is required to be used, the filling volume of the water needs to be optimized, and the filling ratio is between 80 and 140 percent. Most of non-condensable gas is pumped out during vacuum pumping, and high vacuum is maintained. In the process of removing the non-condensable gas secondarily, the welding end of the heat pipe needs to be heated to 50-100 ℃ for a period of time. The non-condensable gas is slowly gathered at the upper end of the heat pipe. In the end sealing process, the pipe section of the non-condensable gas left at the upper end of the heat pipe is removed, the operation of the heat pipe in an ultrahigh vacuum state is ensured, and the end of the heat pipe head is sealed and welded. Bending and flattening the copper pipe to the required thickness of 0.26-0.4mm according to the requirement. After the flattening, a steam channel 3 is formed between the middle side wall 11, the end side wall 12 and the copper fiber bundle capillary wick 2, and a steam channel 3 is formed between the middle side wall 11 and the copper fiber bundle capillary wick 2, so that steam can effectively flow from the steam channel 3 to the condensation end, then the steam is combined into a liquid medium in the condensation section, and the liquid medium returns to the heat section along the capillary wick under the capillary action.
Example two
As shown in fig. 5 and 6, the present embodiment is different from the first embodiment in that:
in this embodiment, a plurality of groups of copper fiber bundle wicks 2 are arranged in the ultra-thin heat pipe (only one of the groups of copper fiber bundles is arranged in the ultra-thin heat pipe shown in fig. 5 and 6, and the number of the copper fiber bundles can be determined according to the requirement), and when the distance between the adjacent copper fiber bundle wicks 2 is kept to be 1.5-5.0 mm and the distance between the copper fiber bundle wick 2 and the end side wall 12 is kept to be 1-5 mm, the ultra-thin heat pipe with a correspondingly large diameter is used according to the number of the copper fiber bundle wicks 2, and the width of the flattened heat pipe is correspondingly increased. The design adopts a linear expansion mode, and the heat exchange effect is improved by increasing the width of the heat pipe under the condition of the same thickness of the heat pipe.
Details not described in the present specification belong to the prior art known to those skilled in the art.
The technical principles of the present invention have been described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. An ultra-thin heat pipe of gradient wick structure which characterized in that: the pipe comprises a pipe body (1), wherein the pipe body (1) comprises a middle side wall (11) and an end side wall (12) connected with the middle side wall (11);
the inner wall of the middle side wall (11) is provided with a copper fiber bundle capillary core (2);
and a steam channel (3) is formed among the middle side wall (11), the end side wall (12) and the copper fiber bundle capillary wick (2), and the steam channel (3) is formed among the middle side wall (11) and the copper fiber bundle capillary wick (2).
2. The ultra-thin heat pipe of gradient wick structure of claim 1, wherein: the copper fiber bundle capillary cores (2) are arranged at intervals, and the distance between the copper fiber bundle capillary cores (2) is 1.5-3.5 mm.
3. The ultra-thin heat pipe of gradient wick structure of claim 1, wherein: the middle side wall (11) and the end side walls (12) are both straight pipe walls.
4. The ultra-thin heat pipe of gradient wick structure of claim 1, wherein: the height h of the copper fiber bundle capillary core (2) is 0.1-0.24 mm.
5. The ultra-thin heat pipe of gradient wick structure of claim 1, wherein: the width of the copper fiber bundle capillary core (2) is 0.5-2.5 mm.
6. The ultra-thin heat pipe of gradient wick structure of claim 1, wherein: the thickness of the middle side wall (11) and the thickness of the end side wall (12) are both 0.06-0.1 mm.
7. The ultra-thin heat pipe of gradient wick structure of claim 1, wherein: the sum H of the thickness of the middle side wall (11) and the height of the copper fiber bundle capillary core (2) is 0.26-0.4 mm.
8. The ultra-thin heat pipe of gradient wick structure of claim 1, wherein: the distance between the end part side wall (12) and the copper fiber bundle close to the end part is 1-3 mm.
9. The ultra-thin heat pipe of gradient wick structure of claim 1, wherein: the copper fiber bundle capillary core (2) is formed by arranging first fibers (21) and second fibers (22) with different diameters in a layered mode or the copper fiber bundle capillary core (2) is formed by arranging the first fibers (21) and the second fibers (22) with different diameters in a partitioned mode.
10. The ultra-thin heat pipe of the gradient wick structure of claim 9, wherein: the diameter of the first fiber (21) is 0.02-0.04mm, and the diameter of the second fiber (22) is 0.04-0.06 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911305217.2A CN111076589A (en) | 2019-12-17 | 2019-12-17 | Ultrathin heat pipe with gradient capillary core structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911305217.2A CN111076589A (en) | 2019-12-17 | 2019-12-17 | Ultrathin heat pipe with gradient capillary core structure |
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| CN111076589A true CN111076589A (en) | 2020-04-28 |
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| CN201911305217.2A Pending CN111076589A (en) | 2019-12-17 | 2019-12-17 | Ultrathin heat pipe with gradient capillary core structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111912275A (en) * | 2020-06-28 | 2020-11-10 | 武汉理工大学 | Gradient ordered pore porous capillary core ultrathin heat pipe and manufacturing method thereof |
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| CN205373481U (en) * | 2015-12-29 | 2016-07-06 | 华南理工大学 | Flat heat pipe of tow wick |
| CN106813524A (en) * | 2015-11-27 | 2017-06-09 | 财团法人工业技术研究院 | Composite fiber capillary structure, manufacturing method thereof and heat pipe |
| CN106979712A (en) * | 2017-04-01 | 2017-07-25 | 华南理工大学 | A kind of preparation method of flexible soft state copper/aluminium strip heat pipe of oldered array distribution multiple fibre |
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2019
- 2019-12-17 CN CN201911305217.2A patent/CN111076589A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729337A (en) * | 2013-12-24 | 2015-06-24 | 白豪 | Coaxial weaving capillary structure of ultrathin heat pipe with fiber bundle and ultrathin heat pipe thereof |
| CN106813524A (en) * | 2015-11-27 | 2017-06-09 | 财团法人工业技术研究院 | Composite fiber capillary structure, manufacturing method thereof and heat pipe |
| CN205373481U (en) * | 2015-12-29 | 2016-07-06 | 华南理工大学 | Flat heat pipe of tow wick |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111912275A (en) * | 2020-06-28 | 2020-11-10 | 武汉理工大学 | Gradient ordered pore porous capillary core ultrathin heat pipe and manufacturing method thereof |
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Application publication date: 20200428 |