CN110425918A - A kind of ultrathin flexible flat-plate heat pipe - Google Patents

A kind of ultrathin flexible flat-plate heat pipe Download PDF

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Publication number
CN110425918A
CN110425918A CN201910669731.8A CN201910669731A CN110425918A CN 110425918 A CN110425918 A CN 110425918A CN 201910669731 A CN201910669731 A CN 201910669731A CN 110425918 A CN110425918 A CN 110425918A
Authority
CN
China
Prior art keywords
flexible
cover plate
heat pipe
silk screen
microtrabeculae
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910669731.8A
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Chinese (zh)
Inventor
史波
许乐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing University of Aeronautics and Astronautics filed Critical Nanjing University of Aeronautics and Astronautics
Priority to CN201910669731.8A priority Critical patent/CN110425918A/en
Publication of CN110425918A publication Critical patent/CN110425918A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00Heat-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
    • F28D15/02Heat-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
    • F28D15/04Heat-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
    • F28D15/043Heat-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 forming loops, e.g. capillary pumped loops

Abstract

The invention discloses a kind of ultrathin flexible flat-plate heat pipes, including upper and lower flexible compound cover board, flexible red copper silk screen and the support column arrangement grown on lower flexible cover plate;Upper and lower lids are formed by trilaminate material, and intermediate one layer is high thermal conductivity flexible graphite film, obtain ultra-thin copper foil layer by physical vapour deposition (PVD)/electro-deposition in flexible graphite film two sides;Closed cavity is formed between cover board by edge seal, and filled with working fluid in the airtight cavity after vacuumizing;The round microtrabeculae to be formed is squeezed by electro-deposition/3D printing/mold on the inside of lower flexible cover plate, forms flexible flat heat pipe support column.Wick structure of the flexible red copper silk screen of hot pressed sintering as heat pipe on upper flexible cover plate.The present invention is not only small in size, light weight, but also thermal conductivity is very high, and flexibility is good, to have very strong surface adaptability.

Description

A kind of ultrathin flexible flat-plate heat pipe
Technical field
The present invention relates to a kind of ultrathin flexible flat-plate heat pipes, belong to technical field of heat transfer.
Background technique
The fast development of electronic industrial technology, so that electronic component is gradually to miniaturization, highly integrated, high-performance direction Development, so that the heat flow density of electronic device operational process is higher and higher, effectively heat dissipation becomes more difficult, and heat dissipation problem is gradually As the bottleneck problem for restricting the development of high integration electronic component.Flat-plate heat pipe is a kind of Phase cooling form of latent heat exchange, Heat transfer efficiency is high, heating conduction is strong, what it can be shed by the sectional area efficient absorption high heat flux density heating device of very little Heat, and the heat of absorption is effectively transported to heat sink, finally efficiently release heat.And flat-plate heat pipe is small in size, matter Amount is light, stability is good, the service life is long, has attracted much attention, is used widely in electronics industry, and becomes a solution electronics The good selection of equipment cooling problem.
Common flat-plate heat pipe is made of upper and lower two pieces of metal cover boards, is often laid with silk screen, agglomerated powder in the inner surface of cover board The wick structures such as end.Although these have certain thermal conductivity, the flexibility of heat pipe itself is very poor, and surface adaptability is poor. Moreover, for flat-plate heat pipe, there are still volumes big, weight weight, the problems such as manufacturing process is complicated.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of ultrathin flexible flat-plate heat pipe, Have the characteristics that flexibility is good and thermal conductivity is high, can not only guarantee the heat transfer property of flat-plate heat pipe but also has good surface adaptability.
Technical solution: a kind of ultrathin flexible flat-plate heat pipe, including upper flexible cover plate, lower flexible cover plate, in the lower flexibility Microtrabeculae is evenly spaced in cover board, the microtrabeculae forms the diversion column and support column of heat pipe, on the inside of the upper flexible cover plate Equipped with flexible red copper silk screen, the flexibility red copper silk screen is as wick structure;The upper flexible cover plate and lower flexible cover plate are equal It is formed by trilaminate material, intermediate one layer is flexible graphite film, is respectively equipped with copper foil layer in the flexible graphite film two sides;Institute It states and forms closed cavity by edge seal between flexible cover plate and lower flexible cover plate, further include connecting filling for the cavity Liquid pipe is filled with working fluid in the cavity after vacuumizing by the filling liquid pipe.
Further, the flexible copper wire Netcom overheat is burnt pressure connection and is generated on the inside of the upper flexible cover plate, described Copper foil layer is created on the two sides of the flexible graphite film by physical vapour deposition (PVD) or electro-deposition respectively, and the microtrabeculae passes through electricity Deposition, 3D printing or die material squeeze to be formed.
Further, the copper foil layer on the inside of the upper flexible cover plate and lower flexible cover plate and the flexible red copper silk screen by Same red copper material is constituted.
Further, the flexible graphite film is with a thickness of 0.05mm, and the copper foil layer is with a thickness of 0.002mm.
Further, the flexible red copper silk screen be the red copper silk screen of 200 mesh, the area of flexible red copper silk screen and position with Area and position are corresponding where the microtrabeculae.
Further, the cross section of the microtrabeculae is round, diameter 1mm, and the microtrabeculae Heterogeneous Permutation of adjacent rows is adjacent micro- The center of circle spacing of column is 3mm.
The utility model has the advantages that a kind of ultrathin flexible flat-plate heat pipe provided by the invention has following excellent compared with the existing technology Point:
(1) efficient heat transfer property.Entire ultrathin flexible heat pipe is made of high thermal conductivity soft graphite film and red copper.Material sheet Body all has the thermal conductivity of superelevation, can be realized effective heat dissipation.
(2) good structure adaptability.Ultrathin flexible flat-plate heat pipe can be bent, and be adapted to a variety of surfaces, with heat source Area is bigger when fitting, it is easier to reach with electronic device and well contact, reduce the thermal contact resistance of system.It can be according to overclocking Cooling requirements change radiating surface shape.
(3) hot-fluid is variable.The not absolute differentiation of heating surface (area) (HS, the film-cooled heat size of ultrathin flexible flat-plate heat pipe and fixed Justice can be changed with the change of application, i.e. evaporation end area and condensation end area is adjustable.For example, In The high occasion of some cooling requirements can increase condensation area to adjust heat flow density.
(4) excellent isothermal.Ultrathin flexible flat-plate heat pipe, not only can be in heat transfer as ordinary flat heat pipe Heat transfer is carried out on direction, also has heat transfer on perpendicular to heat transfer direction, makes the bulk temperature of ultra-thin panel heat pipe Distribution is average, can effectively solve heat dissipation and reduces temperature gradient.
(5) phase transition temperature is low.Rear air content is few due to vacuumizing in ultrathin flexible heat pipe, and the phase transition process of working medium is only It needs very low temperature that can occur, so flat-plate heat pipe has high-termal conductivity, guarantees that heat passes in time;
(6) smaller volume, Lightness, simple structure are easy to make.Ultra-thin panel heat pipe thickness is within 0.3mm, phase Than in common heat pipe, volume is much smaller, and quality is lighter.High heat generation density electronic product suitable for limited space.
Detailed description of the invention
Fig. 1 is the perspective view of the explosion of the embodiment of the present invention;
Fig. 2 is the diagrammatic cross-section in support column of embodiment of the present invention direction;
Fig. 3 is the diagrammatic cross-section of in-plane of the embodiment of the present invention;
Fig. 4 is lower cover plate and support column schematic diagram;
Fig. 5 is upper cover plate schematic diagram.
It include: 1, upper flexible cover plate, 2, lower flexible cover plate, 3, microtrabeculae, 4, flexible red copper silk screen, 5, filling liquid pipe in figure.
Specific embodiment
Further explanation is done to the present invention with reference to the accompanying drawing.
A kind of ultrathin flexible flat-plate heat pipe, including upper flexible cover plate 1, lower flexible cover plate 2.In lower flexible cover plate 2 uniformly It is spaced apart microtrabeculae 3, microtrabeculae 3 squeezes to be formed by electro-deposition, 3D printing or die material, and the cross section of microtrabeculae is circle, Diameter is 1mm, and the microtrabeculae Heterogeneous Permutation of adjacent rows, the center of circle spacing of adjacent microtrabeculae is 3mm.Microtrabeculae 3 forms inside heat pipe steam The diversion column and support column of chamber.
Pressure connection is burnt by heat on the inside of upper flexible cover plate 1 and generates flexible red copper silk screen 4, flexible red copper silk screen 4 is 200 mesh Red copper silk screen, the area of flexible red copper silk screen and position are corresponding with area where microtrabeculae and position, microtrabeculae top and flexible Red copper mesh contacts.Flexible red copper silk screen 4 is used as wick structure.
Upper flexible cover plate 1 and lower flexible cover plate 2 are formed by trilaminate material, and intermediate one layer is to lead with a thickness of the height of 0.05mm Thermal flexibility graphite film, flexible graphite film two sides by physical vapour deposition (PVD) or electro-deposition generate respectively with a thickness of The copper foil layer of 0.002mm.In the present embodiment, the copper foil layer and flexible copper wire of 2 inside of upper flexible cover plate 1 and lower flexible cover plate Net 4 is made of same red copper material, and size is selected according to practical application, and same copper material makes entire inside heat pipe The various parameters of copper are consistent, there is good associativity in hot pressed sintering, and when heat pipe bending, will not destroy any structure.
The airtight cavity that upper flexible cover plate 1 and lower flexible cover plate 2 are formed, cavity side is connected with filling liquid pipe 5.Upper flexible cover By hot pressed sintering between copper foil layer between plate 1 and lower flexible cover plate 2, edge seal is set to form closed cavity, and pass through heat Pressure sintering encapsulation filling liquid pipe 5.It is filled with working fluid in cavity after vacuumizing by filling liquid pipe 5, is used in the present embodiment Working medium is water.
The working principle of the invention is: heat pipe is carried out using gas-liquid phase transition and the steam flowing of internal working fluid Heat transfer, and the capillary force effect provided by capillary wick returns to working medium from condensation segment the passive device of evaporator section.It will be hot The evaporator section of pipe is passed in working fluid close to heater, heat by flat-plate heat pipe tube wall, capillary wick, and is existed by capillary wick The rapid drawout in its surface, after liquid absorption heat on gas-liquid interface rapid vaporization, the steam of evaporation is in small pressure difference It is gradually flowed to the relatively small side of condensation end of heat pipe steam pressure under effect, when steam reaches condensation segment, latent heat can be released, Heat is discharged by capillary wick, working medium and shell, is lost in external environment by heat sink absorption, condensed fluid passes through more again Evaporator section is flowed back in the capillary force effect that hole capillary core material provides again, waits next cyclic absorption heat from heat source, heat pipe work When, internal liquid can be recycled always, take away the heat of heat source.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (6)

1. a kind of ultrathin flexible flat-plate heat pipe, which is characterized in that including upper flexible cover plate (1), lower flexible cover plate (2), described It is evenly spaced on microtrabeculae (3) in lower flexible cover plate (2), the microtrabeculae (3) forms the diversion column and support column of heat pipe, described Flexible red copper silk screen (4) is equipped on the inside of upper flexible cover plate (1), the flexibility red copper silk screen (4) is used as wick structure;On described Flexible cover plate (1) and lower flexible cover plate (2) are formed by trilaminate material, and intermediate one layer is flexible graphite film, in the flexibility Graphite film two sides are respectively equipped with copper foil layer;Pass through edge seal shape between the upper flexible cover plate (1) and lower flexible cover plate (2) It further include the filling liquid pipe (5) for connecting the cavity at closed cavity, the chamber after being vacuumized by the filling liquid pipe (5) It is filled with working fluid in vivo.
2. ultrathin flexible flat-plate heat pipe according to claim 1, which is characterized in that the flexibility red copper silk screen (4) passes through Heat is burnt pressure connection and is generated on the inside of the upper flexible cover plate (1), and the copper foil layer is distinguished by physical vapour deposition (PVD) or electro-deposition The two sides of the flexible graphite film are created on, the microtrabeculae (3) squeezes shape by electro-deposition, 3D printing or die material At.
3. ultrathin flexible flat-plate heat pipe according to claim 1, which is characterized in that upper flexible cover plate (1) He Xiarou Property cover board (2) on the inside of copper foil layer and the flexible red copper silk screen (4) be made of same red copper material.
4. ultrathin flexible flat-plate heat pipe according to claim 1 to 3, which is characterized in that the flexible graphite film is thick Degree is 0.05mm, and the copper foil layer is with a thickness of 0.002mm.
5. ultrathin flexible flat-plate heat pipe according to claim 1 to 3, which is characterized in that the flexibility red copper silk screen It (4) is the red copper silk screen of 200 mesh, the area of flexible red copper silk screen and position are corresponding with area and position where the microtrabeculae.
6. ultrathin flexible flat-plate heat pipe according to claim 1 to 3, which is characterized in that the cross section of the microtrabeculae is Circle, diameter 1mm, the microtrabeculae Heterogeneous Permutation of adjacent rows, the center of circle spacing of adjacent microtrabeculae are 3mm.
CN201910669731.8A 2019-07-24 2019-07-24 A kind of ultrathin flexible flat-plate heat pipe Pending CN110425918A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910669731.8A CN110425918A (en) 2019-07-24 2019-07-24 A kind of ultrathin flexible flat-plate heat pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910669731.8A CN110425918A (en) 2019-07-24 2019-07-24 A kind of ultrathin flexible flat-plate heat pipe

Publications (1)

Publication Number Publication Date
CN110425918A true CN110425918A (en) 2019-11-08

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CN201910669731.8A Pending CN110425918A (en) 2019-07-24 2019-07-24 A kind of ultrathin flexible flat-plate heat pipe

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112595155A (en) * 2019-11-28 2021-04-02 华为技术有限公司 Foldable temperature equalization plate and foldable electronic equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112595155A (en) * 2019-11-28 2021-04-02 华为技术有限公司 Foldable temperature equalization plate and foldable electronic equipment

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