CN116294720B - Flat heat pipe and preparation method thereof - Google Patents
Flat heat pipe and preparation method thereofInfo
- Publication number
- CN116294720B CN116294720B CN202310034872.9A CN202310034872A CN116294720B CN 116294720 B CN116294720 B CN 116294720B CN 202310034872 A CN202310034872 A CN 202310034872A CN 116294720 B CN116294720 B CN 116294720B
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- Prior art keywords
- plate
- flange
- heat pipe
- end opening
- confluence
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Classifications
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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
- F28D15/0233—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 conduits having a particular shape, e.g. non-circular cross-section, annular
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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
- F28D15/025—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 having non-capillary condensate return means
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20336—Heat pipes, e.g. wicks or capillary pumps
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
本发明公开一种平板热管，包括蒸发板和冷凝板，其中，蒸发板包括凹槽，凹槽内设置有微阵列结构，微阵列结构包括多个微柱，微柱呈超亲水性；冷凝板包括凸缘和汇流区；工作时，蒸发板吸收热量，液态工质汽化，蒸汽由微柱之间的蒸汽通道扩散，蒸汽接触冷凝板后凝结成液态，回流至蒸发板继续循环换热。冷凝板具有离散的疏水梯度凸缘，凸缘上设置有超亲水性的汇流区，且汇流区设置微沟槽结构的汇流槽道，凸缘与汇流区相配合使得汇流区具有出色的毛细芯吸能力，从而能够实现冷凝工质的快速无泵回流。本发明还提供一种上述的平板热管的制备方法，将加工好的蒸发板和冷凝板连接，向循环腔体内注入循环工质后抽真空，保证平板热管的工作可靠性。
The present invention discloses a flat heat pipe, comprising an evaporation plate and a condensation plate, wherein the evaporation plate comprises a groove, a microarray structure is provided in the groove, the microarray structure comprises a plurality of microcolumns, and the microcolumns are super-hydrophilic; the condensation plate comprises a flange and a confluence area; during operation, the evaporation plate absorbs heat, the liquid working medium vaporizes, the steam diffuses through the steam channel between the microcolumns, the steam condenses into a liquid after contacting the condensation plate, and flows back to the evaporation plate to continue circulating heat exchange. The condensation plate has a discrete hydrophobic gradient flange, a super-hydrophilic confluence area is provided on the flange, and a confluence channel with a micro-groove structure is provided in the confluence area. The flange and the confluence area cooperate to make the confluence area have excellent capillary wicking ability, thereby enabling rapid pumpless reflux of the condensed working medium. The present invention also provides a preparation method of the above-mentioned flat heat pipe, connecting the processed evaporation plate and the condensation plate, injecting the circulating working medium into the circulation cavity and then evacuating the cavity to ensure the working reliability of the flat heat pipe.
Description
Technical Field
The invention relates to the technical field of heat exchange equipment and peripheral supporting facilities thereof, in particular to a flat heat pipe and a preparation method thereof.
Background
With the rapid development of microelectronic technology, core components are continuously developed towards high frequency, high power consumption, high integration and miniaturization, and it is expected that power and cooling requirements will be greatly increased, and how to efficiently dissipate heat in a limited space is a key to ensure normal operation of electronic equipment. The flat heat pipe can be directly matched with the surfaces of electronic devices such as chips, and has the advantages of strong temperature control capability on a centralized heat source, smooth and flat outer surface, good geometric adaptability and the like. On the premise that a future thermal management system is pursued to be small in size and high in cooling efficiency in an endless manner, it is particularly important to develop a flat heat pipe which is compact in space and excellent in heat transfer performance.
The traditional flat heat pipe consists of an evaporation end, a condensation end and a liquid absorption core, heat is transmitted from the evaporation end, a working medium is rapidly vaporized and contacts the condensation end, gaseous working medium is supercooled into liquid and flows back to the evaporation section through the liquid absorption core to complete circulation, the whole process transfers heat by means of phase change latent heat of the working medium, and the working temperature is kept stable. The wick is used as a bridge for circulating working media, is a main factor for limiting the size of an ultrathin flat heat pipe, a series of problems of liquid storage capacity reduction, vapor diffusion space reduction and the like exist in the traditional sintered wick structure, the heat transfer performance is seriously influenced, and the problems of insufficient capillary force, small flow, difficult working media backflow and the like exist in the groove-type wick structure with small volume occupancy rate.
Disclosure of Invention
The invention aims to provide a flat heat pipe and a preparation method thereof, which are used for solving the problems in the prior art and improving the heat transfer performance of the flat heat pipe.
In order to achieve the above purpose, the invention provides a flat heat pipe, comprising:
The evaporation plate comprises a first plate body, a groove is formed in the first plate body, a microarray structure is arranged in the groove, the microarray structure comprises a plurality of microcolumns, the microcolumns are arranged in an array mode, gaps are reserved between adjacent microcolumns, and the microcolumns are super-hydrophilic;
The condensing plate comprises a second plate body and a flange matched with the groove, wherein the second plate body is connected with the flange, the flange is hydrophobic, the hydrophobicity of the flange is in discrete gradient change, a confluence area is arranged on the flange and is super-hydrophilic, the confluence area comprises a plurality of confluence units connected in series, the confluence units are provided with narrow end openings and wide end openings along the connection direction of the confluence units, the confluence units comprise a plurality of confluence channels, the confluence channels are micro-grooves, the length direction of the confluence channels is parallel to the connection direction of the confluence units, and the bottom surfaces of the confluence channels are obliquely arranged along the direction from the wide end openings to the narrow end openings and face the direction of the second plate body;
The condensing plate is located the top of evaporating plate, the flange stretches into in the recess, the edge of first plate body with the edge of second plate body links to each other, evaporating plate with form between the condensing plate and can hold the circulating cavity of working medium circulation.
Preferably, a recess is formed between adjacent microposts, and the recess is U-shaped.
Preferably, the microcolumns are of prismatic structures, and are arranged in a rectangular array shape.
Preferably, the narrow end opening is an end opening of the converging unit, the other end opening of the converging unit is an end opening, the wide end opening is located between the narrow end opening and the end opening, the width of the converging unit decreases from the wide end opening to the direction of the end opening, the distance between the wide end opening and the end opening is larger than the distance between the wide end opening and the narrow end opening, and the side wall of the wide end opening is an arc surface.
Preferably, the hydrophobic gradient of the flange varies following the following law:
Δθs＝θa-θr
Wherein, theta a is the advancing angle of the working fluid drop at the joint of the adjacent converging units, theta r is the retreating angle of the working fluid drop at the joint of the adjacent converging units, and theta s is the rolling angle of the flange.
Preferably, the inclination of the bottom surface of the converging channel is less than 2 °.
Preferably, the number of the converging areas is multiple, and the converging areas are arranged on the flange in parallel.
Preferably, the evaporation plate and the condensation plate are both provided with liquid injection ports, the liquid injection ports are communicated with the circulating cavity, and the liquid injection ports can be connected with liquid injection pipes.
The invention also provides a preparation method of the flat heat pipe, which comprises the following steps:
step one, processing the evaporating plate and the condensing plate, and connecting edges of the first plate body and the second plate body in a sealing way;
And step two, injecting working medium into the circulating cavity, and vacuumizing the circulating cavity.
Preferably, the edges of the first plate body and the second plate body are connected in a welding mode, liquid working medium is injected into the converging area, and the cavity surrounded by the condensing plate and the groove is vacuumized.
Compared with the prior art, the flat heat pipe has the following technical effects that the flat heat pipe comprises an evaporation plate and a condensation plate, wherein the evaporation plate comprises a first plate body, a groove is formed in the first plate body, a micro-array structure is arranged in the groove, the micro-array structure comprises a plurality of micro-columns which are arranged in an array mode, gaps are reserved between the adjacent micro-columns, the micro-columns are super-hydrophilic, the condensation plate comprises a second plate body and a flange which is matched with the groove, the second plate body is connected with the flange, the flange is hydrophobic, the hydrophobicity of the flange changes in a discrete gradient mode, a confluence area is arranged on the flange, the confluence area is super-hydrophilic, the confluence area comprises a plurality of confluence units connected in series, the confluence units are provided with narrow end openings and wide end openings along the connecting direction of the confluence units, the confluence units comprise a plurality of confluence channels, the length direction of the confluence channels is parallel to the connecting direction of the confluence units, the directions from the wide end openings to the narrow end openings are inclined towards the direction of the second plate body, the bottom surface of the confluence channels is arranged in an inclined mode, the top of the condensation plate is located at the top of the evaporation plate body, the condensation plate can be connected with the edge of the first plate body and the circulation cavity, and the circulation plate can be accommodated between the first plate and the edge of the condensation plate and the circulation cavity.
When the flat heat pipe works, the evaporating plate absorbs heat, the liquid working medium is vaporized, steam is diffused by the steam channels between the microcolumns, and is condensed into liquid after contacting the condensing plate, and the liquid flows back to the evaporating plate to continue circulating heat exchange. The condensing plate is provided with a discrete hydrophobic gradient flange, the flange is provided with a super-hydrophilic converging region, the converging region is provided with a converging channel of a micro-groove structure, the flange is matched with the converging region to ensure that the converging region has excellent capillary wicking capability, so that the condensing working medium can quickly flow back without a pump and has good anti-gravity property, micro-columns on the evaporating plate are hydrophilic and can serve as auxiliary liquid suction core structures to quickly spread liquid working medium, and in addition, the converging channel is of an inclined structure, so that on one hand, the height difference can be provided for the working medium backflow, on the other hand, the steam flow channel is enlarged, and the heat transfer performance of the ultra-thin flat plate heat pipe is further improved. According to the flat heat pipe, the microarray structure is arranged in the groove, the confluence area is arranged on the flange, and when the first plate body and the second plate body are connected, the flange stretches into the groove, so that the thickness of the flat heat pipe is reduced, the microarray structure can also play a role in supporting the flat heat pipe, the phenomenon of collapse of the ultrathin flat heat pipe is prevented, and the stability of the flat heat pipe is improved.
Meanwhile, the invention also provides a preparation method of the flat heat pipe, which is characterized in that a processed evaporating plate is connected with a condensing plate, and after a circulating working medium is injected into a circulating cavity, the circulating cavity is vacuumized, so that the working reliability of the flat heat pipe is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an evaporating plate of a flat heat pipe according to the present invention;
FIG. 2 is a schematic view of a condensation plate of a flat heat pipe according to the present invention;
Fig. 3 is a schematic view of a part of the structure of a condensation plate of the flat heat pipe according to the present invention.
Wherein 100 is an evaporation plate, 200 is a condensation plate;
1 is a first plate body, 2 is a groove, 3 is a microcolumn, 4 is a recess, 5 is a second plate body, 6 is a flange, 7 is a converging region, 8 is a converging channel, 9 is a converging unit, 10 is a narrow end opening, 11 is a wide end opening, and 12 is an end opening.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a flat heat pipe and a preparation method thereof, which are used for solving the problems in the prior art and improving the heat transfer performance of the flat heat pipe.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The invention provides a flat heat pipe, which comprises an evaporation plate 100 and a condensation plate 200, wherein the evaporation plate 100 comprises a first plate body 1, a groove 2 is arranged on the first plate body 1, a microarray structure is arranged in the groove 2, the microarray structure comprises a plurality of microcolumns 3, the microcolumns 3 are arranged in an array shape, gaps are reserved between adjacent microcolumns 3, and the microcolumns 3 are super-hydrophilic; the condensing plate 200 comprises a second plate body 5 and a flange 6 matched with the groove 2, the second plate body 5 is connected with the flange 6, the flange 6 is hydrophobic, the hydrophobicity of the flange 6 changes in a discrete gradient mode, a converging area 7 is arranged on the flange 6, the converging area 7 is super-hydrophilic, the converging area 7 comprises a plurality of converging units 9 connected in series, the converging units 9 are provided with narrow end openings 10 and wide end openings 11 along the connecting direction of the converging units 9, the converging units 9 comprise a plurality of converging channels 8, the converging channels 8 are of micro-groove structures, the length direction of the converging channels 8 is parallel to the connecting direction of the converging units 9, the bottom surface of the converging channels 8 is obliquely arranged towards the direction of the second plate body 5 along the direction of the wide end openings 11, the condensing plate 200 is arranged at the top of the evaporating plate 100, the flange 6 extends into the groove 2, the edge of the first plate body 1 is connected with the edge of the second plate body 5, and a circulating cavity capable of containing working medium circulation is formed between the evaporating plate 100 and the condensing plate 200.
When the flat heat pipe works, the evaporating plate 100 absorbs heat, the liquid working medium is vaporized, steam is diffused by the steam channel between the microcolumns 3, and is condensed into a liquid state after contacting the condensing plate 200, and the liquid state flows back to the evaporating plate 100 for continuous circulation heat exchange. The condensing plate 200 is provided with a discrete hydrophobic gradient flange 6, the flange 6 is provided with a super-hydrophilic converging region 7, the converging region 7 is provided with a converging channel 8 with a micro-groove structure, the flange 6 is matched with the converging region 7 to ensure that the converging region 7 has excellent capillary wicking capability, so that rapid pumpless reflux of condensing working media can be realized, meanwhile, the condensing plate also has good antigravity characteristic, the microcolumns 3 on the evaporating plate 100 are hydrophilic and can serve as auxiliary wick structures to rapidly spread liquid working media, in addition, the converging channel 8 is of an inclined structure, on one hand, the height difference can be provided for the reflux of working media, on the other hand, the steam flow channel is enlarged, and the heat transfer performance of the ultrathin flat heat pipe is further improved. According to the flat heat pipe, the microarray structure is arranged in the groove 2, the confluence region 7 is arranged on the flange 6, and when the first plate body 1 and the second plate body 5 are connected, the flange 6 stretches into the groove 2, so that the thickness of the flat heat pipe is reduced, the microarray structure can also play a role in supporting the flat heat pipe, the phenomenon of collapse of the ultrathin flat heat pipe is prevented, and the stability of the flat heat pipe is improved.
It should be emphasized that referring to fig. 1, the adjacent micropillars 3 have a recess 4, the recess 4 is U-shaped, and a microstructure array formed by the micropillars 3 and the recess 4 is processed in the recess 2, so that on one hand, a certain mechanical property can be provided to support the ultrathin flat heat pipe to prevent collapse after vacuumizing, and on the other hand, the U-shaped recess 4 can provide a space for vapor diffusion to accelerate the evaporation rate of the working medium. After super-hydrophilic treatment, the microstructure array can improve the critical heat flux of working media, and nucleation sites are more easily wetted by working media liquid and undergo repeated phase changes. When bubbles are generated on the overheated wall surface, a micro-liquid layer exists on the bubble and the wall surface, most of heat is taken away by evaporation of the micro-liquid layer, and only when the micro-liquid layer is continuously replenished from surrounding media, vacancies after bubble breakage can be rewetted, the bubbles can continue to grow and break, and the whole boiling process can continue. The better wettability means that the more fully the microfluidic layer is in contact with the surface, each activation pore of the surface can be covered, and in the case of high heat flux, the activation pores are fully activated and the phase change is faster.
The micro-columns 3 are of prismatic structures, the micro-columns 3 are arranged in a rectangular array shape, in the specific embodiment, the micro-columns 3 are of cuboid structures, the depth of the grooves 2 is 0.05mm-0.5mm, the length of the micro-columns 3 is 0.3mm-0.5mm, the height of the micro-columns 3 is 0.04mm-0.4mm, the distance between every two adjacent micro-columns 3 is 1mm, the depth of the U-shaped concave 4 is 0.02mm-0.2mm, the grooves 2 can be machined on the first plate body 1 by micro milling, and then the micro-array structure is machined by utilizing a micro milling cutter. In other embodiments of the present invention, other structures may be used for the microcolumn 3, which improves flexibility of the evaporation plate 100.
Specifically, the converging unit 9 is in a droplet shape, or, in other words, the converging unit 9 is in a shape after being rounded in a spindle shape, referring to fig. 2 and 3, the narrow end opening 10 is located at one end opening of the converging unit 9, the other end opening of the converging unit 9 is an end opening 12, the wide end opening 11 is located between the narrow end opening 10 and the end opening 12, the width of the converging unit 9 decreases from the wide end opening 11 to the end opening 12, similarly, the width of the converging unit 9 decreases from the wide end opening 11 to the narrow end opening 10, the distance between the wide end opening 11 and the end opening 12 is larger than the distance between the wide end opening 11 and the narrow end opening 10, and the side wall of the wide end opening 11 is a cambered surface. In practical application, the wedge angle of the long side of the fusiform-like converging unit 9 is 2 degrees to 4 degrees, the straight line topology of the short side is optimized to be an arc, the length of the single converging unit 9 is 20mm to 40mm, the end opening 12 of the converging unit 9 is connected with the narrow end opening 10 of the adjacent converging unit 9, and the interface width is 1mm to 5mm. In this embodiment, the second plate body 5 and the flange 6 are of an integral structure, the flange 6 is processed on the plate, discrete hydrophobic treatment is firstly performed on the surface of the flange 6, then, the confluence region 7 formed by serially connecting the confluence units 9 is processed on the surface of the flange 6, the confluence region 7 in a spindle shape can provide a laplace force for working fluid, self-transportation from the narrow end opening 10 to the wide end opening 11 is realized, the length between the wide end opening 11 and the end opening 12 can be reduced after serially connecting the confluence units 9, liquid films are prevented from being formed by spreading of liquid drops of the working fluid in the region between the wide end opening 11 and the end opening 12, and the liquid drops participate in the phase change circulation process. After the confluence units 9 are connected in series, an energy barrier is artificially constructed at the connection part, the phenomenon of energy singular points can be avoided by arc connection, the energy barrier at the transition part is overcome by discrete hydrophobic gradients, and when the liquid drops pass through the part, the difference of front and rear contact angles is obvious because of the changed hydrophobic substrates, so that a wetting gradient force is given to the liquid to break through the energy barrier. The confluence region 7 is formed by a confluence channel 8 of a micro-groove structure, condensed liquid drops can be transported in the confluence channel 8 firstly after nucleation, at the moment, the liquid drops are rapidly spread to the top end due to capillary phenomenon, and the later nucleated condensed liquid drops are transported in the pre-wetted confluence region 7, so that the movement resistance of the liquid drops is greatly reduced due to the fact that the liquid drops are changed from solid-liquid contact to partial liquid-liquid contact, and the transportation speed of working media can be greatly improved. The flow converging channel 8 has a smaller gradient, so that the steam diffusion area can be further enlarged, and the reflux speed of working media can be improved by means of gravitational potential energy.
It should also be noted that the discrete gradient of hydrophobicity of the flange 6 decreases from the narrow end opening 10 of the confluence unit 9, the gradient of hydrophobicity being varied in a range depending on the size and the overall length of the confluence unit 9. The change in the hydrophobicity gradient follows the following law:
Δθs＝θa-θr
Wherein, theta a is the advancing angle of the working fluid droplet at the joint of the adjacent converging units 9, theta r is the retreating angle of the working fluid droplet at the joint of the adjacent converging units 9, theta s is the rolling angle of the flange 6, and the difference value of the rolling angles of the flange 6 areas corresponding to the adjacent two converging units 9 is equal to the difference between the advancing angle and the retreating angle of the working fluid droplet at the corresponding joint.
In this embodiment, the slope of the bottom surface of the converging channel 8 is less than 2 ° so that the converging unit 9 has the greatest gravitational potential energy at the narrow end opening 10.
In practical application, the quantity of the converging areas 7 is multiple groups, and the converging areas 7 are arranged on the flange 6 in parallel, so that the backflow capacity of the liquid working medium is further enhanced.
More specifically, the evaporating plate 100 and the condensing plate 200 are provided with liquid injection ports, the liquid injection ports are communicated with the circulating cavity, the liquid injection ports can be connected with liquid injection pipes, and circulating working media are conveniently injected into the circulating cavity and vacuumized.
Further, the invention also provides a preparation method of the flat heat pipe, which comprises the following steps:
The first step is to process an evaporating plate 100 by adopting a copper alloy plate with the thickness of 0.2mm as a first plate body 1, process a groove 2 with the depth of 0.12mm on the first plate body 1 by adopting micro milling, process a microarray structure on the bottom surface of the groove 2 by adopting a micro milling cutter, wherein the distance between adjacent micropillars 3 is 1mm, the length of the micropillars 3 is 0.5mm, and the height is 0.05mm.
And secondly, processing U-shaped depressions 4 at gaps between adjacent microcolumns 3 by adopting a ball head micro milling cutter, wherein the bottom diameter of each depression 4 is 1mm, and the depth is 0.1mm, and performing super-hydrophilic treatment on the microarray structure.
And thirdly, processing a condensing plate 200 by adopting a copper alloy plate with the thickness of 0.2mm, processing a flange 6 with the height of 0.12mm at a position corresponding to the groove 2 on the plate by adopting micro milling, sequentially processing discrete hydrophilic gradient surfaces by adjusting laser power on the surfaces of the flange 6, performing ultra-lyophobic fluorination treatment on the whole surfaces, longitudinally scanning the outline of a converging region 7 on the surfaces of the flange 6 by using laser, processing a converging channel 8 structure with the gradient of 1 DEG by adjusting the repeated scanning times of the laser power, wherein the converging region 7 is ultra-hydrophilic, the wedge angle of the long side of a fusiform converging unit 9 is 2 DEG, the short side is connected in series, and the length of a single converging unit 9 is 25mm.
And fourthly, covering the evaporating plate 100 on the condensing plate 200, wherein the flange 6 of the condensing plate 200 extends into the groove 2 of the evaporating plate 100, edges of the first plate body 1 and the second plate body 5 are sealed through brazing, a backflow gap is reserved between the first plate body 1 and the second plate body 5, a sealed shell with a liquid injection port is formed, and a liquid injection pipe is arranged at the liquid injection port.
And fifthly, pouring the liquid working medium into the converging channel 8 through a liquid pouring pipe, and vacuumizing to enable the cavity enclosed by the groove 2 and the condensing plate 200 to be in a vacuum state.
And step six, welding a sealed liquid injection pipe, performing secondary degassing, and then welding the position of a sealed liquid injection port, removing the liquid injection pipe, and completing the encapsulation of the flat heat pipe.
The flat heat pipe comprises an evaporation plate 100 and a condensation plate 200, wherein the evaporation plate 100 and the condensation plate 200 are respectively processed into a groove 2 and a flange 6 according to mortise and tenon structures, and the condensation plate 200 is arranged on the evaporation plate 100 for joggle joint and then sealed connection. The groove 2 of the evaporating plate 100 is internally provided with a micro-array structure, the micro-columns 3 separate the groove 2 to construct a plurality of superheated steam flow channels, the flange 6 of the condensing plate 200 is in discrete hydrophobic gradient, and a plurality of confluence areas 7 with confluence units 9 connected in series are arranged, wherein the confluence areas 7 are formed by confluence channels 8 with micro-groove structures. The groove-type liquid suction core of the flow converging channel 8 is matched with a discrete gradient hydrophobic interface, so that the condensed working medium can be rapidly conveyed without a pump, the flow converging channel 8 has a small gradient, the reflux speed of the working medium can be further increased, and the steam flow channel can be enlarged. The mortise and tenon structure and the groove type liquid absorption core enable the size of the flat heat pipe with the wettability gradient structure to be thinner, meanwhile, the mechanical property of a component is met, and the heat exchange performance of the flat heat pipe is improved.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided herein to facilitate understanding of the principles and embodiments of the present invention and to provide further advantages and practical applications for those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. A flat heat pipe, comprising:
The evaporation plate comprises a first plate body, a groove is formed in the first plate body, a microarray structure is arranged in the groove, the microarray structure comprises a plurality of microcolumns, the microcolumns are arranged in an array mode, gaps are reserved between adjacent microcolumns, and the microcolumns are super-hydrophilic;
The condensing plate comprises a second plate body and a flange matched with the groove, wherein the second plate body is connected with the flange, the flange is hydrophobic, the hydrophobicity of the flange is in discrete gradient change, a confluence area is arranged on the flange and is super-hydrophilic, the confluence area comprises a plurality of confluence units connected in series, the confluence units are provided with narrow end openings and wide end openings along the connection direction of the confluence units, the confluence units comprise a plurality of confluence channels, the confluence channels are micro-grooves, the length direction of the confluence channels is parallel to the connection direction of the confluence units, and the bottom surfaces of the confluence channels are obliquely arranged along the direction from the wide end openings to the narrow end openings and face the direction of the second plate body;
The condensing plate is located the top of evaporating plate, the flange stretches into in the recess, the edge of first plate body with the edge of second plate body links to each other, evaporating plate with form between the condensing plate and can hold the circulating cavity of working medium circulation.
2. The flat plate heat pipe according to claim 1, wherein a recess is formed between adjacent micropillars, and the recess is U-shaped.
3. The flat heat pipe according to claim 1, wherein the micro-pillars are prismatic structures and are arranged in a rectangular array.
4. The flat heat pipe according to claim 1, wherein the narrow end opening is an end opening of the converging unit, the other end opening of the converging unit is an end opening, the wide end opening is located between the narrow end opening and the end opening, the width of the converging unit decreases from the wide end opening to the end opening, the distance between the wide end opening and the end opening is larger than the distance between the wide end opening and the narrow end opening, and the side wall of the wide end opening is a cambered surface.
5. The flat plate heat pipe according to claim 4, wherein the hydrophobic gradient of the flange changes following the following law:
Δθs＝θa-θr
Wherein, theta a is the advancing angle of the working fluid drop at the joint of the adjacent converging units, theta r is the retreating angle of the working fluid drop at the joint of the adjacent converging units, and theta s is the rolling angle of the flange.
6. The flat plate heat pipe according to claim 1, wherein the inclination of the bottom surface of the converging channel is less than 2 °.
7. The flat heat pipe according to claim 1, wherein the number of the converging areas is plural, and the converging areas are arranged in parallel on the flange.
8. The flat heat pipe according to claim 1, wherein the evaporation plate and the condensation plate are provided with liquid injection ports, the liquid injection ports are communicated with the circulating cavity, and the liquid injection ports can be connected with liquid injection pipes.
9. A method of manufacturing a flat heat pipe according to any one of claims 1 to 8, comprising the steps of:
step one, processing the evaporating plate and the condensing plate, and connecting edges of the first plate body and the second plate body in a sealing way;
And step two, injecting working medium into the circulating cavity, and vacuumizing the circulating cavity.
10. The method of manufacturing a flat heat pipe according to claim 9, wherein edges of the first plate body and the second plate body are connected by welding, a liquid working medium is injected into the converging region, and a cavity surrounded by the condensing plate and the groove is vacuumized.
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| CN117895152B (en) * | 2024-02-21 | 2025-02-18 | 华南理工大学 | Evaporator for battery thermal management and battery thermal management device |
| CN119767652B (en) * | 2025-03-10 | 2025-06-06 | 日善电脑配件(嘉善)有限公司 | Temperature balancing plate and method for manufacturing the same |
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| CN106225531A (en) * | 2016-07-26 | 2016-12-14 | 华南理工大学 | The preparation of a kind of non-homogeneous wettability efficient phase transformation coating and gravity assisted heat pipe device |
| CN109539846A (en) * | 2018-11-23 | 2019-03-29 | 西安交通大学 | A kind of flat-plate heat pipe with gradient wetting structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100498186C (en) * | 2006-06-02 | 2009-06-10 | 富准精密工业(深圳)有限公司 | Hot pipe |
| TW200848683A (en) * | 2007-03-08 | 2008-12-16 | Convergence Technologies Ltd | Heat transfer device |
| US8842435B2 (en) * | 2012-05-15 | 2014-09-23 | Toyota Motor Engineering & Manufacturing North America, Inc. | Two-phase heat transfer assemblies and power electronics incorporating the same |
| CN110822959B (en) * | 2019-10-24 | 2021-09-07 | 西安交通大学 | A superhydrophobic-hydrophilic surface vacuum cavity heat sink |
| KR102442845B1 (en) * | 2020-03-23 | 2022-09-15 | 화인시스 주식회사 | Vapor chamber |
| CN113883936B (en) * | 2020-07-03 | 2025-08-19 | 台达电子工业股份有限公司 | Thin type temperature-equalizing plate structure |
| CN217217285U (en) * | 2022-03-30 | 2022-08-16 | 哈尔滨工业大学（深圳） | Vapor chamber capable of rapidly dissipating heat |
| CN115175527B (en) * | 2022-07-16 | 2024-12-20 | 哈尔滨工业大学（深圳） | Ceramic-based heat sink and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106225531A (en) * | 2016-07-26 | 2016-12-14 | 华南理工大学 | The preparation of a kind of non-homogeneous wettability efficient phase transformation coating and gravity assisted heat pipe device |
| CN109539846A (en) * | 2018-11-23 | 2019-03-29 | 西安交通大学 | A kind of flat-plate heat pipe with gradient wetting structure |
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