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CN205482499U - Porous wick's of plane direction gradient temperature -uniforming plate - Google Patents

Porous wick's of plane direction gradient temperature -uniforming plate Download PDF

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Publication number
CN205482499U
CN205482499U CN201620117053.6U CN201620117053U CN205482499U CN 205482499 U CN205482499 U CN 205482499U CN 201620117053 U CN201620117053 U CN 201620117053U CN 205482499 U CN205482499 U CN 205482499U
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China
Prior art keywords
capillary wick
gradient
gradient porous
porous capillary
temperature
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Withdrawn - After Issue
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CN201620117053.6U
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Chinese (zh)
Inventor
张东辉
吴明发
张凤梅
史国进
杨珊珊
丁玉鑫
王剑桥
周丽
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Jiangsu University of Science and Technology
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Jiangsu University of Science and Technology
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Abstract

The utility model discloses a porous wick's of plane direction gradient temperature -uniforming plate, this temperature -uniforming plate including the second panel that absorbs the heat source with be used for radiating first panel, install the porous wick of first gradient on the first panel, install the porous wick of second gradient on the second panel, porous wick of first gradient and the porous wick fixed connection of second gradient, the porous wick of second gradient is equipped with the cavity towards one side of the porous wick of first gradient, and the porous wick of second gradient side is equipped with the filler line that switches on with the cavity, porous wick of first gradient and the porous wick of second gradient are gradient pore structure, and it has fluid working medium all to fill among porous wick of first gradient and the porous wick of second gradient to annotate. The contradiction between traditional temperature -uniforming plate flow resistance and the capillary force is overcome in the invention, and this board has that the capillary pressure is big, the flow resistance is little, temperature uniformity is good, heat dispersion is high, avoid local advantage such as dry.

Description

A kind of temperature-uniforming plate of the gradient porous capillary wick of in-plane
Technical field
The present invention relates to the temperature-uniforming plate of the gradient porous capillary wick of a kind of in-plane, belong to field of radiating.
Background technology
Along with the integrated level of electronic chip and power device is continuously increased, cause the continuous rising of heat flow density, and cause electricity " focus " problem that sub-field is common.Traditional air cooling mode has reached the industrial limit of meeting the tendency;And water-cooled side Formula, have peace and quiet, cooling temperature, to advantages such as condition depended are little, but also have relatively costly, bulky etc. simultaneously Shortcoming, and extra energy consumption need to be consumed.In recent years, more efficiently heat sink conception, such as elongated flat heat pipe etc. are the widest General it is applied in notebook computer.But use flat hot pipe to process " focus " problem, because of the inherent characteristics of its one-dimensional heat radiation, Still it is difficult to meet further following requirement.In recent years, the application of temperature-uniforming plate is paid close attention to greatly, because it effectively will The quickly diffusion of thermal source two dimension, becomes the important method solving association area heat dissipation problem.
Temperature-uniforming plate is mainly made up of evaporation ends, condensation end, wick and working fluid, and main operational principle is: at thermal source Heat first passes through evaporation ends substrate and passes to working fluid, and working fluid is heated generation evaporative phase-change, then cold at cryosurface Solidifying, the heat discharged can directly be distributed to environment by condensation end outer surface;Meanwhile, the condensed fluid suction by capillary wick Power backs within evaporation ends, the most again evaporates, and constitutes the circulation of ongoing evaporative condenser.The heat radiation of temperature-uniforming plate The raising of performance, the raising with capillary wick performance has important association, to ensure that enough liquid refrigerants return flow quantity.But hair The selection of thin core can face a basic contradiction: the contradiction between capillary force and flow resistance.When the capillary wick using small-bore Time, capillary force can increase, and flow resistance can interrogate speed rising;Otherwise, when using wide-aperture capillary wick, flowing resistance Power can reduce, and capillary force can decline.For improving the heat dispersion of temperature-uniforming plate, big small-bore composite wick structure quilt Adopting, i.e. in evaporation ends center sintering overlapping one small-bore capillary wick, and the capillary wick in other regions all uses large aperture Capillary wick.
China Patent No. [201510114972.8], discloses a kind of graded metal loose foam thermal, including: coolant Flow channel and airtight evaporation cavity.Wherein: the inwall of coolant flow passage and airtight evaporation cavity is equipped with graded metal bubble Foam.Graded metal foam hole variable density scope is 3PPI~130PPI, and porosity change scope is 0.5~0.98, material Matter is red copper, rustless steel, aluminum or nickel.The patent proposes the consideration that gradient foam metal is applied to heat abstractor, but Be its foam metal gradient porous structure feature be from top to bottom, or Gradient distribution from bottom to top, this and usual temperature-uniforming plate The requirement returning liquid conveying is not inconsistent, it is difficult to solve the lance between high capillary force and low flow resistance specific to temperature-uniforming plate capillary wick Shield.Evaporation ends and condensation end capillary wick are also in separating up and down, and condensed fluid back flow channel cannot form overall continuous print passage knot Structure, and vertical gradient multi-hole center structure is difficult to ultra-thin, it is difficult to meet the market demand of current ultra-thin temperature-uniforming plate.
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 gradient porous hair of in-plane The temperature-uniforming plate of thin core, overcomes the contradiction between tradition temperature-uniforming plate flow resistance and capillary force, this plate have capillary pressure big, Flow resistance is little, uniform temperature good, heat dispersion is high, avoid the most dry advantage.
Technical scheme: for achieving the above object, the temperature-uniforming plate of the gradient porous capillary wick of a kind of in-plane of the present invention, bag Include and absorb the second sheet material of thermal source and for the first sheet material dispelled the heat, described first sheet material is provided with the first gradient porous hair Thin core, the second sheet material is provided with the second gradient porous capillary wick, the first gradient porous capillary wick and the second gradient porous hair Thin core is fixing to be connected, and described second gradient porous capillary wick is provided with cavity towards the side of the first gradient porous capillary wick, the Two gradient porous capillary wick sides are provided with and the filler line of cavity conducting, described first gradient porous capillary wick and the second gradient Porous capillary core is gradient pore structured, is all filled with in the first gradient porous capillary wick and the second gradient porous capillary wick Fluid working substance.
As preferably, described first gradient porous capillary wick aperture constantly diminishes to surrounding aperture from center, and the second gradient is many Capillary wick aperture, hole constantly diminishes from four circumference center bores, and the aperture of the first gradient porous capillary wick and porosity are respectively less than The aperture of the second gradient porous capillary wick and porosity.
As preferably, described first gradient porous capillary wick is foam metal, and hole count is 60PPI~100PPI, porosity Excursion is 0.9~0.97;First gradient porous capillary wick aperture is foam metal, and hole count is 100PPI~300PPI, Porosity change scope is 0.6~0.9.
As preferably, the center of described cavity is extended with boss, the upper surface of boss and the second gradient porous capillary wick surface Concordant.
As preferably, being provided with several supporting constructions in described cavity, supporting construction two ends are gradient porous with first respectively Capillary wick and the second gradient porous capillary wick connect.
As preferably, described fluid working substance is in deionized water, ethanol, acetone and the fluorine that degassing deionization processes Any one in Ang.
As preferably, described degassing deionization condenses after being processed as first convection cell working medium heating, the then pure place of deionization Reason, it is ensured that the unlikely degeneration of performance life-time service of temperature-uniforming plate.
The integral gradient porous capillary cored structure of the present invention so that the contradiction between capillary force and flow resistance is able to more preferably Balance.On the one hand gradient porous capillary wick avoids the shortcoming that small-bore capillary wick flow resistance is excessive, on the other hand keeps away Exempt from the shortcoming that large aperture capillary wick capillary force is too small, can further improve working medium circulation flow, break through tradition further all The capillary limitation of temperature plate and dry limit bottleneck.Thus provide new scheme for thinner, the more preferable temperature-uniforming plate of performance of research and development.
Beneficial effect: the temperature-uniforming plate of the gradient porous capillary wick of in-plane of the present invention, utilizes gradient aperture and porosity The capillary force that multi-hole center produces is returned liquid effect and is realized self-loopa, owing to porous capillary core is journey graded in the horizontal direction, Contradiction between capillary force and flow resistance is balanced, and on the one hand gradient porous capillary wick avoids small-bore capillary The shortcoming that core flow resistance is excessive, on the other hand avoids the shortcoming that large aperture capillary wick capillary force is too small, improves working medium and follows Circulation, can break through the dry limit bottleneck of tradition temperature-uniforming plate, under certain heating power, axial thermal resistance and diffusion further Thermal resistance also can reduce accordingly.
Accompanying drawing explanation
Fig. 1 is the perspective exploded view of the present invention.
Fig. 2 is the first gradient porous capillary wick two-dimensional representation in the present invention.
Fig. 3 is the second gradient porous capillary wick two-dimensional representation in the present invention.
Fig. 4 is the sectional structure schematic diagram of the present invention.
Fig. 5 is operation principle schematic diagram of the present invention.
Fig. 6 is manufacturing process figure of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further described.
As shown in Figures 1 to 5, the temperature-uniforming plate of the gradient porous capillary wick of a kind of in-plane of the present invention, including absorbing heat Second sheet material 4 in source 1 and the first sheet material 2 for heat radiation, the first sheet material 2 and the second sheet material 4 use red copper punching press shape Become, described first sheet material 2 is provided with the first gradient porous capillary wick 3, the second sheet material 4 is provided with the second gradient many Hole capillary wick 5, the first gradient porous capillary wick 3 is fixing with the second gradient porous capillary wick 5 to be connected, described second gradient Porous capillary core 5 is provided with cavity 10, the second gradient porous capillary wick 5 towards the side of the first gradient porous capillary wick 3 Side is provided with and the filler line 7 of cavity 10 conducting, described first gradient porous capillary wick 3 and the second gradient porous capillary wick 5 are gradient pore structured, are all filled with fluid in the first gradient porous capillary wick 3 and the second gradient porous capillary wick 5 Working medium.
In the present invention, described first gradient porous capillary wick 3 aperture constantly diminishes to surrounding aperture from center, the second ladder Degree porous capillary core 5 aperture constantly diminishes from four circumference center bores, the aperture of the first gradient porous capillary wick 3 and hole Rate is respectively less than aperture and the porosity of the second gradient porous capillary wick 5.Described first gradient porous capillary wick 3 is foam gold Belonging to, hole count is 60PPI~100PPI, and porosity change scope is 0.9~0.97;First gradient porous capillary wick 3 hole Footpath is foam metal, and hole count is 100PPI~300PPI, and porosity change scope is 0.6~0.9.Described cavity 10 Center is extended with boss 13, the upper surface of boss 13 and the second gradient porous capillary wick 5 flush.First gradient is many Hole capillary wick 3 and the second gradient porous capillary wick 5 are sintering core, and sintering core uses powder sintering or powder wet spray Making etc. technology, the straight grain of hole and porosity can be changed on request.
In the present invention, being provided with several supporting constructions 6 in described cavity 10, supporting construction 6 two ends are respectively with first Gradient porous capillary wick 3 and the second gradient porous capillary wick 5 connect.Supporting construction 6 is copper post, copper wire or some strength Copper mesh, to prevent welding and deformation during evacuation.
In the present invention, described fluid working substance is deionized water, ethanol, acetone and the fluorine processed through degassing deionization Any one in Lyons.Described degassing deionization condenses after being processed as first convection cell working medium heating, it is ensured that temperature-uniforming plate The unlikely degeneration of performance life-time service.
As it is shown in figure 5, the manufacture method of the temperature-uniforming plate of a kind of gradient porous capillary wick of above-mentioned in-plane, including following Step:
(1) copper material punch forming operation: use anaerobic rose copper material thick for 0.2mm~0.5mm to make, the first sheet material 2 (condensation end) in four limit convex shape, need to according to the height of designed temperature-uniforming plate cavity 10 height adjustment surrounding chimb, And the second sheet material 4 chimb height more than the diameter of filler line, and need to place filler line in surrounding chimb side processing one Aperture, the second sheet material 4 (evaporation ends) inner surface side is furnished with a lot of equally distributed circular draw-in groove;
(2) supporting construction sintering circuit: use graphite jig, is supported structure sintering and makes the first sheet material 2, Supporting construction can use solid copper pin and Porous Cu post, or complex copper post, the height of supporting construction be cavity 10 height with Second sheet material 4 circular card groove depth sum;
(3) gradient porous capillary wick preparation section: the method such as powder sintering, powder wet spray can be used, at plate The porous layer that particle diameter is sequentially reduced is laid on material surface;
(4) matting: the oil removing in ultrasonic cleaning equipment initially with ethanol or trichloro ethylene, then uses clear water It is rinsed, then uses the alkali liquor of finite concentration uniform temperature to remove oxide layer, base extraction in ultrasonic waves for cleaning fills After use the hot water of 60~80 DEG C to rinse immediately, be finally putting into the interior hydrogen of high temperature sintering furnace and carry out reduction treatment;
(5) sheet material welding sequence: use vacuum brazing or diffusion welding (DW) to weld after the first sheet material 2 and the second sheet material 4 being fastened It is connected into shape, as used high temperature true hole method for welding, selects melt temperature 700~the silver-bearing copper weld tabs of 800 DEG C, its melt temperature Less than the sintering temperature (900~950 DEG C) of capillary wick, for making upper and lower capillary wick form continuous print integration passage, can be Same silver-bearing copper weld tabs is laid up and down at capillary wick edge and center step;
(6) filler line welding sequence: use high-frequency induction welder or high temperature vacuum brazing method, select melt temperature 600~ The silver-bearing copper weld tabs of 700 DEG C, engages the one side with temperature-uniforming plate by filler line;
(7) vacuum leak hunting operation: use helium mass spectrometer leak detector opposite heat tube to carry out high true hole leak detection;
(8) working medium preparation section: as used device of working medium, for ensureing the unlikely degeneration of performance life-time service of temperature-uniforming plate, should With first heating the method condensed afterwards, water is de-gassed process, then the pure process of deionization;
(9) working medium evacuation operation is filled: use the mode of evacuation after first filling to carry out, when vacuum reaches 10-2~ 10-1Time, complete this preparation section;
(10) sealing operation: when temperature-uniforming plate vacuum reaches requirement, uses high-frequency induction welder to filler line 7 immediately Soldering and sealing, completes the Making programme of temperature-uniforming plate.
The operation principle of the present invention: in temperature-uniforming plate, the area of the second gradient porous capillary wick 5 aperture area adds corresponding to outside Thermal source 1 area, condensation side outer surface can use air cooling fin or water collar to cool down, and fluid working substance is at thermal source 1 Absorb heat and then evaporative phase-change, the steam 11 that evaporative phase-change produces occur in the pore structure of the second gradient porous capillary wick 5 Running through cavity 10, be diffused into condensation inner surface the first sheet material 2 and condense, the phase transformation heat discharged is passed by heat The effect of leading transfers heat to condensing surface the first sheet material 2 outer surface, and the condensation water 12 that condensation produces is at the work of capillary force With lower by the first gradient porous capillary wick 3 and the second gradient porous capillary wick 5, add in the second sheet material inner surface The heart carries out evaporative phase-change next time, owing to the contradiction of the application of gradient porous structure, capillary force and flow resistance is balanced, Make condensed fluid return flow quantity to be improved, thus break through the dry limit of tradition temperature-uniforming plate.And then guarantee electronic device safety, Efficient and stable operation.
The above is only the preferred embodiment of the present invention, it should be pointed out that: for those skilled in the art For, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications are also Should be regarded as protection scope of the present invention.

Claims (7)

1. the temperature-uniforming plate of the gradient porous capillary wick of in-plane, it is characterised in that: include the second plate absorbing thermal source Material and the first sheet material for heat radiation, described first sheet material is provided with the first gradient porous capillary wick, and the second sheet material is pacified Equipped with the second gradient porous capillary wick, the first gradient porous capillary wick is fixing with the second gradient porous capillary wick to be connected, described Second gradient porous capillary wick is provided with cavity towards the side of the first gradient porous capillary wick, the second gradient porous capillary wick side Face is provided with and the filler line of cavity conducting, and described first gradient porous capillary wick and the second gradient porous capillary wick are gradient Pore structure, the first gradient porous capillary wick and the second gradient porous capillary wick are all filled with fluid working substance.
The temperature-uniforming plate of the gradient porous capillary wick of in-plane the most according to claim 1, it is characterised in that: described First gradient porous capillary wick aperture constantly diminishes to surrounding aperture from center, and the second gradient porous capillary wick aperture is from surrounding Constantly diminishing to center bore, the aperture of the first gradient porous capillary wick and porosity are respectively less than the second gradient porous capillary wick Aperture and porosity.
The temperature-uniforming plate of the gradient porous capillary wick of in-plane the most according to claim 2, it is characterised in that: described First gradient porous capillary wick is foam metal, and hole count is 60PPI~100PPI, and porosity change scope is 0.9~0.97; First gradient porous capillary wick aperture is foam metal, and hole count is 100PPI~300PPI I, porosity change scope be 0.6~ 0.9。
The temperature-uniforming plate of the gradient porous capillary wick of in-plane the most according to claim 3, it is characterised in that: described The center of cavity is extended with boss, the upper surface of boss and the second gradient porous capillary wick flush.
The temperature-uniforming plate of the gradient porous capillary wick of in-plane the most according to claim 4, it is characterised in that: described Being provided with several supporting constructions in cavity, supporting construction two ends are many with the first gradient porous capillary wick and the second gradient respectively Hole capillary wick connects.
The temperature-uniforming plate of the gradient porous capillary wick of in-plane the most according to claim 5, it is characterised in that: described Fluid working substance is any one in deionized water, ethanol, acetone and the freon that degassing deionization processes.
The temperature-uniforming plate of the gradient porous capillary wick of in-plane the most according to claim 6, it is characterised in that: described Degassing deionization condenses after being processed as first convection cell working medium heating, the then pure process of deionization.
CN201620117053.6U 2016-02-05 2016-02-05 Porous wick's of plane direction gradient temperature -uniforming plate Withdrawn - After Issue CN205482499U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105716461A (en) * 2016-02-05 2016-06-29 江苏科技大学 Temperature equalizing plate with gradient porous capillary cores in plane direction and manufacturing method for temperature equalizing plate
CN109906025A (en) * 2019-04-24 2019-06-18 常州恒创热管理有限公司 A kind of U-shaped temperature-uniforming plate and radiator
CN110132039A (en) * 2018-02-09 2019-08-16 通用电气公司 The structure of the increasing material manufacturing of heat and/or mechanical system and the method for manufacturing the structure
CN110686542A (en) * 2018-07-05 2020-01-14 高力热处理工业股份有限公司 Manufacturing method of temperature-equalizing plate and temperature-equalizing plate
CN113008061A (en) * 2021-03-24 2021-06-22 广东工业大学 Vapor chamber condensation end of ultrathin bionic vein gradient liquid absorption core structure
CN113453495A (en) * 2021-05-19 2021-09-28 江西展耀微电子有限公司 Vapor chamber and electronic equipment thereof
CN115507683A (en) * 2021-06-22 2022-12-23 中兴通讯股份有限公司 Evaporator

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105716461A (en) * 2016-02-05 2016-06-29 江苏科技大学 Temperature equalizing plate with gradient porous capillary cores in plane direction and manufacturing method for temperature equalizing plate
CN110132039A (en) * 2018-02-09 2019-08-16 通用电气公司 The structure of the increasing material manufacturing of heat and/or mechanical system and the method for manufacturing the structure
CN110132039B (en) * 2018-02-09 2021-07-13 通用电气公司 Cooling assembly and additive manufacturing method thereof
CN110686542A (en) * 2018-07-05 2020-01-14 高力热处理工业股份有限公司 Manufacturing method of temperature-equalizing plate and temperature-equalizing plate
CN109906025A (en) * 2019-04-24 2019-06-18 常州恒创热管理有限公司 A kind of U-shaped temperature-uniforming plate and radiator
CN109906025B (en) * 2019-04-24 2024-02-20 常州恒创热管理有限公司 U-shaped temperature equalization plate and radiator
CN113008061A (en) * 2021-03-24 2021-06-22 广东工业大学 Vapor chamber condensation end of ultrathin bionic vein gradient liquid absorption core structure
CN113453495A (en) * 2021-05-19 2021-09-28 江西展耀微电子有限公司 Vapor chamber and electronic equipment thereof
CN113453495B (en) * 2021-05-19 2022-06-24 江西新菲新材料有限公司 Vapor chamber and electronic equipment thereof
CN115507683A (en) * 2021-06-22 2022-12-23 中兴通讯股份有限公司 Evaporator
WO2022267576A1 (en) * 2021-06-22 2022-12-29 中兴通讯股份有限公司 Evaporator

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Granted publication date: 20160817

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