CN1847770A - Heat pipe and its making process - Google Patents
Heat pipe and its making process Download PDFInfo
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- CN1847770A CN1847770A CN 200510034242 CN200510034242A CN1847770A CN 1847770 A CN1847770 A CN 1847770A CN 200510034242 CN200510034242 CN 200510034242 CN 200510034242 A CN200510034242 A CN 200510034242A CN 1847770 A CN1847770 A CN 1847770A
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Abstract
The heat pipe of the present invention includes one casing, wicks contacting closely to the inner wall of the casing, and work fluid filling the wicks and sealed inside the casing. Each of wicks includes heat conducting silk screen, heat conducting grains on the heat conducting silk screen and heat conducting fibers set on the heat conducting grains. The heat conducting grains are micron level in granularity, and the heat conducting fibers are nanometer level in diameter, so that the wicks have increased heat dissipating area and the heat pipe has raised heat dissipating efficiency. In addition, the wicks may have raised compactness for fast fluid transfer speed and no capillary limit phenomenon. The preparation process of the heat pipe is also provided.
Description
[technical field]
The present invention relates to a kind of heat pipe and preparation method thereof, particularly a kind of silk screen imbibition core pattern heat pipe and preparation method thereof.
[background technology]
Electronic technology develops rapidly in recent years, and the high frequency of electronic component, high speed and integrated circuit intensive and microminiaturized makes unit volume electronic component caloric value increase severely.Existing radiating mode comprises modes such as radiating fin, heat pipe and thermally-conductive interface.How to improve radiating efficiency to solve the heat energy that electronic component was sent, preventing becomes current important topic because of the integrated circuit closeness increases the damage that the high hot high temperature that produces causes electronic component.
Heat pipe is the heat-conductive assembly that dependence self internal work fluid phase transformation realizes heat conduction, and it has characteristics such as high-termal conductivity, good isothermal, and good heat conduction effect is widely used.And characteristics such as hot pipe technique is efficient with it, compactness and flexibility and reliability are fit to solve the heat dissipation problem that present electronic component is derived because of performance boost.
Typical heat pipe is made up of shell, imbibition core (capillary structure) and the working fluid that is sealed in the described shell.The making of heat pipe is normally filled with suitable working fluid after being evacuated in the pipe earlier, makes to be sealed after being full of working fluid in the imbibition core of being close to inner wall of tube shell.One end of heat pipe is evaporation ends (fire end), and the other end is condensation end (colling end), can between evaporation ends and condensation end the adiabatic section be set according to application need.When the heat pipe evaporation ends was heated, the working fluid carburation by evaporation formed steam in the imbibition core, and steam condenses into working fluid and emits heat at the dirty condensation end to heat pipe of slight pressure difference effect, and working fluid relies on the capillarity of imbibition core to flow back to evaporation ends again.So the result of circulation is: heat constantly reaches condensation end by the evaporation ends of heat pipe, and is positioned at the low-temperature receiver absorption of the condensation end other end.
In the conduction process that heat pipe is stated in realization, mainly comprise following six processes that are mutually related:
(1) heat passes to working fluid from thermal source by heat pipe package and the imbibition core that is full of working fluid;
(2) working fluid evaporates on liquid-gas interface in evaporation ends;
(3) steam flows to condensation end from evaporation ends;
(4) steam condenses on the solution-air interface in condensation end;
(5) heat is passed to low-temperature receiver from the solution-air interface by imbibition core, working fluid and shell;
(6) capillarity by the imbibition core makes condensed liquid working fluid be back to evaporation ends.
From said process (1), (5) and (6), find out that the imbibition core plays an important role in conduction process.
The imbibition core of heat pipe normally forms geometrical patterns such as triangle, square or circle in the prior art on inner wall of tube shell, or at Guan Zhongtian plug net metal, or with the powdered-metal sintering on inner wall of tube shell.
But there is capillary stone wall phenomeon (Wicking Limit) in above-mentioned liquid sucting core structure, hinders the conduction of heat.That is, because the capillary attraction effect of imbibition core, build-up of pressure is poor in the contained liquid of imbibition in-core in the heat pipe, and this pressure differential can make the liquid of condensation portion flow back to evaporation section; After heat pipe begins to conduct heat, working fluid begins to circulate in its shell, if the pressure differential that the pressure differential that liquid flow caused of imbibition in-core can bear greater than capillary attraction, then the working fluid of condensation portion can't flow back to evaporation section, this moment evaporation section the imbibition core become owing to working fluid can't arrive the drying (Dryout); These dry imbibition cores not only make working fluid circulate, and also can hinder the conduction of heat.
[summary of the invention]
Below, heat pipe that a kind of capillary attraction is big, heat transfer efficiency is high and preparation method thereof will be described with embodiment.
For realizing foregoing, a kind of heat pipe is provided, it comprises a hollow bulb, be close to inner wall of tube shell the imbibition core and be full of this imbibition core and be sealed in working fluid in the shell.Wherein, described imbibition core comprises the heat conduction silk screen, is located at the online heat conduction particle of this heat conductive filament and is located at heat conducting fiber on this heat conduction particle.Described heat conductive filament's net materials can be selected from metal, alloy or macromolecular material, and its mesh is preferably micron order.Described heat conduction particle material is selected from metal or alloy, and its particle diameter is a micron order.Described heat conducting fiber material is selected from metal oxide or alloyed oxide, and its diameter is a nanoscale.
And, a kind of preparation method of heat pipe is provided, it comprises: (1) provides a hollow bulb; (2) preparation one has the heat conduction silk screen of heat conduction particle, forms heat conducting fiber on this heat conduction particle, to form the imbibition core; (3) this imbibition core is curled fill in described shell; (4) described shell is sealed after making this imbibition in-core be full of working fluid.Described heat conductive filament's net materials can be selected from metal, alloy or macromolecular material, and its mesh is preferably micron order.Described heat conduction particle material is selected from metal or alloy, and its particle diameter is preferably micron order.Described heat conducting fiber material is selected from metal oxide or alloyed oxide, and its diameter is preferably nanoscale.
With respect to prior art, the heat pipe wicks that present embodiment provided comprises micron order heat conduction particle and nanoscale heat conducting fiber, can improve the compactness of imbibition core, increase capillary attraction, accelerate the transmission speed of working fluid, improve heat pipe heat radiation efficient, and can prevent the generation of capillary stone wall phenomeon in the prior art; In addition, described heat conduction particle adopts micron particles and heat conducting fiber to adopt nano-scale fiber, can increase the surface area of imbibition core, further improves the radiating efficiency of heat pipe.
[description of drawings]
Fig. 1 is the heat pipe structure and the operation principle schematic diagram thereof of present embodiment.
Fig. 2 is the liquid sucting core structure schematic diagram of present embodiment.
Fig. 3 is the flow chart of the heat control Preparation Method of present embodiment.
[specific embodiment]
Below, in conjunction with the accompanying drawings the technical program is described further.
See also Fig. 1 and Fig. 2, Fig. 1 is the heat pipe structure and the operation principle schematic diagram thereof of present embodiment, and Fig. 2 is the liquid sucting core structure schematic diagram of present embodiment.As shown in Figure 1, the heat pipe 1 that present embodiment provided comprises shell 10, capillary structure imbibition core 20 and working fluid 30, and the one end is an evaporation ends 40, and the other end is a condensation end 50.As shown in Figure 2, imbibition core 20 comprises heat conduction silk screen 21, is located at the heat conduction particle 22 on the heat conduction silk screen 21 and is located at heat conducting fiber 23 on the heat conduction particle 22.
Wherein, heat conduction silk screen 21 materials can be selected from metals such as copper, aluminium, steel, carbon steel, stainless steel, iron, nickel, titanium and wherein the alloy that forms of two kinds or above metal or as macromolecular materials such as PASC (gathering silicon aluminium chloride), silicon rubber, its mesh is preferably micron order.The material of heat conduction particle 22 is selected from metals such as copper, aluminium, steel, carbon steel, stainless steel, iron, nickel, titanium and the alloy that forms of two kinds or above metal wherein, and its particle diameter is a micron order, selects the copper particle in the present embodiment for use.Heat conducting fiber 23 materials promptly, can be metal oxide or alloyed oxide according to the difference of heat conduction particle 22 materials and difference is the oxide fibre of heat conduction particle 22.Heat conducting fiber 23 in the present embodiment is the cupric oxide fiber, and its diameter is a nanoscale, preferred 0.1～100nm.
When the evaporation ends 40 of heat pipe 1 is heated, working fluid 30 carburation by evaporations form steam in the imbibition core 20, steam is in the dirty condensation end 50 to heat pipe 1 of slight pressure difference effect, condense into liquid working fluid 30 and emit heat at this end, liquid working fluid 30 flows back to evaporation ends 40 by the capillarity of imbibition core 20 again.Circulation so repeatedly, heat constantly reaches condensation end 50 by the evaporation ends 40 of heat pipe 1, and is positioned at low-temperature receiver (figure does not show) absorption of condensation end 50 other ends.
The heat pipe wicks 20 that present embodiment provided comprises micron order heat conduction particle 22 and nanoscale heat conducting fiber 23, can improve the compactness of imbibition core 20, increase the capillary attraction of 20 pairs of working fluids 30 of imbibition core, accelerate the transmission speed of working fluid 30, improve the radiating efficiency of heat pipe 1, and can prevent the generation of capillary stone wall phenomeon; In addition, adopt micron particles and heat conducting fiber 23 to adopt nano-scale fiber, can increase the surface area of imbibition core 20, further improve the radiating efficiency of heat pipe 1 at heat conduction particle 22.
See also Fig. 3, Fig. 3 is the flow chart of the heat control Preparation Method of present embodiment.The preparation method of the heat pipe 1 that present embodiment provided comprises the steps:
Step 100 a: hollow bulb 10 is provided.Shell 10 comprises base material and is added on the interior nano carbon material of this base material.Different as required, metals such as the optional copper freely of described base material, aluminium, steel, carbon steel, stainless steel, iron, nickel, titanium and the alloy that forms of two kinds or above metal or wherein as macromolecular materials such as PASC, silicon rubber.Described nano carbon material comprises in the CNT of hollow carbon nanotube, hollow nano carbon microsphere and the high heat conducting material of interior coating or the nano carbon microsphere any one or multiple combination, and wherein this high heat conducting material can be selected from copper, aluminium, gold, silver or the alloy that forms of two kinds or above metal wherein.
Shell 10 radial sections can be standard circular, also can be abnormal shape, as ellipse, square, rectangle, triangle etc.Caliber is 2 millimeters～200 millimeters, and pipe range can be from several millimeters to tens of rice.
In the present embodiment, the base material of shell 10 is the copper that is added with the hollow carbon nanotube, is shaped to cylindrical tube, and caliber is 4 millimeters, long 50 millimeters.
Step 200: preparation one has the heat conduction silk screen 21 of heat conduction particle 22, forms heat conducting fiber 23 on heat conduction particle 22, forms imbibition core 20.Its concrete manufacturing process is as follows:
At first, purchase the heat conduction silk screen 21 of typing mesh number in market, its material is selected according to the compatibility of heat pipe work fluid 30, can be selected from metals such as copper, aluminium, steel, carbon steel, stainless steel, iron, nickel, titanium and the alloy that forms of two kinds or above metal or as macromolecular materials such as PASC, silicon rubber wherein.Select copper mesh in the present embodiment for use.The mesh of this copper mesh is preferably micron order.
Secondly, on heat conduction silk screen 21, form heat conduction particle 22.The material of heat conduction particle 22 is selected from metals such as copper, aluminium, steel, carbon steel, stainless steel, iron, nickel, titanium and the alloy that forms of two kinds or above metal wherein.Select the copper particle in the present embodiment for use.Evenly disperse the copper particle on copper mesh, this copper particle size is a micron order; The copper mesh that is dispersed with the copper particle is sent into heating furnace, and sintering is made an appointment with half an hour under hydrogen shield, and sintering temperature is 810 ℃～880 ℃; With described copper mesh from heating furnace, take out the cooling after, put into the heating furnace sintering once more about 1 hour.
At last, control growth temperature and oxygen partial pressure utilize the self-catalyst mechanism of copper and towards the character of material preferred orientations growth with reduction activation energy, make regularly arranged cupric oxide fiber on the copper particle of copper mesh, thus acquisition imbibition core 20.This cupric oxide fiber can be replaced by the oxide fibre of heat conduction particle 22 according to the material difference of its heat conduction particle 22,, can be metal oxide or alloyed oxide that is.Heat conducting fiber 23 diameters are nanoscale, preferred 0.1～100nm.
Step 300: the imbibition core 20 that curls is filled in it in shell 21.If imbibition core 21 applying shells 22 inwalls are inhomogeneous, at evaporation ends the damage that hot-spot will cause heat pipe will appear particularly, so, can make imbibition core 20 be close to shell 21 inwalls by modes such as mechanical tractions.
Step 400: make shell 1 to be sealed after being full of working fluid 30 in this imbibition core 20.Working fluid 30 can be selected liquid such as pure water, ammoniacal liquor, methyl alcohol, acetone or heptane for use, also can add the particulate of Heat Conduction Material in this liquid, as copper powder, nano carbon material etc., to increase the heat conductivility of working fluid.Present embodiment adopts pure water as working fluid.
Claims (11)
1. heat pipe, it comprises:
The shell of one hollow;
One is close to the imbibition core on this inner wall of tube shell; And
Be sealed in the working fluid in this shell;
It is characterized in that this imbibition core comprises the heat conduction silk screen that is close on the inner wall of tube shell, be located at the online heat conduction particle of this heat conductive filament and be located at heat conducting fiber on this heat conduction particle.
2. heat pipe as claimed in claim 1 is characterized in that the material of described heat conduction silk screen is selected from metal, alloy or macromolecular material.
3. heat pipe as claimed in claim 1 is characterized in that the material of described heat conduction particle is selected from metal or alloy.
4. heat pipe as claimed in claim 1 is characterized in that the material of described heat conducting fiber is selected from metal oxide or alloyed oxide.
5. heat pipe as claimed in claim 1 is characterized in that, the particle diameter of described heat conduction particle is a micron order.
6. heat pipe as claimed in claim 1 is characterized in that, the diameter of described heat conducting fiber is a nanoscale.
7. the preparation method of a heat pipe comprises the steps:
One hollow bulb is provided;
Preparation one has the heat conduction silk screen of heat conduction particle, and forms heat conducting fiber on this heat conduction particle, forms the imbibition core;
This imbibition core curled fill in described shell;
After making this imbibition in-core be full of working fluid described shell is sealed.
8. the preparation method of heat pipe as claimed in claim 7 is characterized in that, described heat conducting fiber can be by self-catalysis method preparation.
9. the preparation method of heat pipe as claimed in claim 7 is characterized in that, the material of described heat conduction silk screen is selected from metal, alloy or macromolecular material.
10. the preparation method of heat pipe as claimed in claim 7 is characterized in that, the material of described heat conduction particle is selected from metal or alloy.
11. the preparation method of heat pipe as claimed in claim 7 is characterized in that, the material of described heat conducting fiber is selected from metal oxide or alloyed oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100342423A CN100453953C (en) | 2005-04-15 | 2005-04-15 | Heat pipe and its making process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100342423A CN100453953C (en) | 2005-04-15 | 2005-04-15 | Heat pipe and its making process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1847770A true CN1847770A (en) | 2006-10-18 |
| CN100453953C CN100453953C (en) | 2009-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100342423A Expired - Fee Related CN100453953C (en) | 2005-04-15 | 2005-04-15 | Heat pipe and its making process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573424A (en) * | 2012-01-17 | 2012-07-11 | 长沙力元新材料有限责任公司 | Wick material for heat sink device for electronic component, heat sink device and preparation method of heat sink device |
| CN103727823A (en) * | 2013-12-12 | 2014-04-16 | 华南理工大学 | Combined exterior structural heat pipe for vertical heat-pipe condensers and manufacturing method thereof |
| CN105633037A (en) * | 2016-01-08 | 2016-06-01 | 西安交通大学 | Pulsation heat pipe radiating apparatus for cooling chips |
| CN105928403A (en) * | 2016-04-28 | 2016-09-07 | 安徽工业大学 | Powder-microfiber composite porous capillary core applicable to loop heat pipe system |
| CN106705723A (en) * | 2016-12-08 | 2017-05-24 | 苏州鸿凌达电子科技有限公司 | Heat pipe core, heat pipe and sputtering process of heat pipe |
| CN107771011A (en) * | 2017-09-28 | 2018-03-06 | 深圳市英威腾电气股份有限公司 | A kind of flexible phase-change heat radiating device |
| CN108457132A (en) * | 2018-04-10 | 2018-08-28 | 浙江舒康科技有限公司 | Aluminium ammonia heat pipe paper mould hot-pressing drying mold and drying means |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3953184B2 (en) * | 1998-04-13 | 2007-08-08 | 株式会社フジクラ | Heat pipe manufacturing method |
| US6648063B1 (en) * | 2000-04-12 | 2003-11-18 | Sandia Corporation | Heat pipe wick with structural enhancement |
| CN2679628Y (en) * | 2004-03-09 | 2005-02-16 | 徐惠群 | Thermotube having improved capillary |
-
2005
- 2005-04-15 CN CNB2005100342423A patent/CN100453953C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573424A (en) * | 2012-01-17 | 2012-07-11 | 长沙力元新材料有限责任公司 | Wick material for heat sink device for electronic component, heat sink device and preparation method of heat sink device |
| CN102573424B (en) * | 2012-01-17 | 2015-05-20 | 长沙力元新材料有限责任公司 | Wick material for heat sink device for electronic component, heat sink device and preparation method of heat sink device |
| CN103727823A (en) * | 2013-12-12 | 2014-04-16 | 华南理工大学 | Combined exterior structural heat pipe for vertical heat-pipe condensers and manufacturing method thereof |
| CN105633037A (en) * | 2016-01-08 | 2016-06-01 | 西安交通大学 | Pulsation heat pipe radiating apparatus for cooling chips |
| CN105928403A (en) * | 2016-04-28 | 2016-09-07 | 安徽工业大学 | Powder-microfiber composite porous capillary core applicable to loop heat pipe system |
| CN106705723A (en) * | 2016-12-08 | 2017-05-24 | 苏州鸿凌达电子科技有限公司 | Heat pipe core, heat pipe and sputtering process of heat pipe |
| CN107771011A (en) * | 2017-09-28 | 2018-03-06 | 深圳市英威腾电气股份有限公司 | A kind of flexible phase-change heat radiating device |
| CN108457132A (en) * | 2018-04-10 | 2018-08-28 | 浙江舒康科技有限公司 | Aluminium ammonia heat pipe paper mould hot-pressing drying mold and drying means |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100453953C (en) | 2009-01-21 |
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