CN100395505C - Sintering type heat pipe and manufacturing method thereof - Google Patents
Sintering type heat pipe and manufacturing method thereof Download PDFInfo
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- CN100395505C CN100395505C CNB2005100341045A CN200510034104A CN100395505C CN 100395505 C CN100395505 C CN 100395505C CN B2005100341045 A CNB2005100341045 A CN B2005100341045A CN 200510034104 A CN200510034104 A CN 200510034104A CN 100395505 C CN100395505 C CN 100395505C
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Abstract
The present invention relates to a sintered heat pipe which comprises a metal pipe body, wherein a porous capillary structure made of sintered powder is arranged on the inner wall of the metal pipe body. A multi-layer type structure is formed by the porous capillary structure along the radial direction of the sintered heat pipe, and a multi-segment type structure is formed by each layer along the axial direction of the sintered heat pipe. The porous capillary structure is formed in a mode that powder particles with different size dimensions are filled into the metal pipe body and sintered on the inner wall of the metal pipe body, and the thickness of a structure layer is controlled by a core rod. The performance of the sintered heat pipe is enhanced because pore space change of a three-dimensional grade is formed by the porous capillary structure and the purposes of providing lower reflowing resistance and enhancing capillary force can be simultaneously obtained.
Description
[technical field]
The present invention relates to the heat radiation field, particularly about a kind of sintered heat pipe and manufacture method thereof that is used to transmit heat.
[background technology]
Along with the constantly progressive and extensive use of large scale integrated circuit technology, the development of information industry is advanced by leaps and bounds, and the high-frequency high-speed processor is constantly released.Because the high-frequency high-speed operation makes the processor unit interval produce a large amount of heats, to cause the rising of processor self temperature as these heats of untimely eliminating, safety and performance to system make a big impact, the problem of essential solution when at present heat dissipation problem has become high speed processor of new generation and releases.
Because radiating requirements is improved constantly, new-type heat abstractor constantly occurs.It is exactly wherein a kind of that heat pipe is applied to the electronic building brick heat radiation, it is that temperature remains unchanged and can absorb or emit the principle work of a large amount of heats when utilizing liquid to change between gas, liquid binary states, changes the traditional heat-dissipating device limited situation of efficient with the heat radiation of metal fever conduction pattern merely.Heat pipe is the liquid that an amount of heat of vaporization height of splendid attire, good fluidity, chemical property are stable in a sealing low pressure tubular shell, boiling point is lower, as water, ethanol, acetone etc., utilize this liquid to be heated and cool off and when between gas, liquid binary states, changing, absorb or emit a large amount of heats and make heat pass to the other end rapidly by body one end.
Reflux for ease of condensed liquid, operated by rotary motion has porous capillary structure on the heat pipe internal face, reflux by the liquid after this porous capillary structure generation capillary force driving condensation, the general vesicular structure that adopts single even hole of the porous capillary structure of known heat pipe is as single sintered type metal dust structure.Because capillary force and porous capillary structure pore size are inversely proportional to, promptly the more little capillary force of the diameter of hole is big more, therefore is convenient to the liquid backflow for reaching bigger capillary force, use more than the aperture of hole material hole the smaller the better.So, because fluid aperture by runner in flow process is more little, frictional resistance that fluid is suffered and viscous force are also big more, make that therefore the resistance of liquid backflow also increases thereupon, flow velocity diminishes.When the end that heat pipe absorbs heat absorbed heat and increases, evaporation was accelerated, and liquid causes dry combustion method, the damage heat pipe easily because backflow resistance and speed reduces can't replenish the evaporating liquid of heat absorbing end rapidly.Therefore the pore size of heat pipe porous capillary structure and the performance that distribution of pores directly influences heat pipe have the porous capillary structure that changes hole so hope can provide, and utilize hole to change and promote properties of hot pipe.
[summary of the invention]
For improving the structure of porous structure layer in the heat pipe, be necessary to provide a kind of at this and have higher capillary force and the heat pipe that hangs down the backflow resistance, and the manufacture method that a kind of this heat pipe is provided simultaneously.
This sintered heat pipe comprises the metal body, this inboard wall of tube body is provided with the porous capillary structure that sintered powder constitutes, this porous capillary structure radially forms multilayer architecture along heat pipe, and each layer is along the axially formation multi-segment structure of heat pipe, varying in size of sintered powder grains, each layer sintered powder is along the axial three-dimensional pore structure that radially all forms three-dimensional graded that reaches of heat pipe.
The manufacture method of this sintered heat pipe may further comprise the steps: preparation process, the powder particle that a metal body promptly is provided and has multiple size; Fill out the powder step, promptly with the control of a plug as Laminate construction thickness, above-mentioned powder particle is inserted in batches to body, with axially forming multi-segment structure and making Fast Sintering at body, repeat this step and cause radially formation multiple layer along this body, each layer sintered powder along heat pipe axially and radially all form the three-dimensional pore structure of three-dimensional graded; Integral sintered and subsequent processing steps is promptly done integral sinteredly after all powder is all inserted in the body, and the plug that will insert for the last time after sintering is finished is extracted out, and charges into airtight this body behind the hydraulic fluid in the body cavity.
Compare prior art, above-mentioned sintered heat pipe is by making multilayer multisection type sintered powder loose structure, forming three-dimensional gradient-porosity changes, the loose structure convection cell resistance that hole is bigger is little, and the capillary force of the less loose structure convection cell of hole is big, can reach simultaneously provides low backflow resistance and improves capillary force, thereby promotes properties of hot pipe.
[description of drawings]
Below with reference to accompanying drawing, in conjunction with the embodiments the present invention is further described.
Fig. 1 is sintered heat pipe first a preferred embodiment of the present invention generalized section vertically.
Fig. 2 is sintered heat pipe second a preferred embodiment of the present invention generalized section vertically.
Fig. 3 is sintered heat pipe the 3rd a preferred embodiment of the present invention generalized section vertically.
Fig. 4 A to Fig. 4 C is the manufacture method process schematic diagram of sintered heat pipe first preferred embodiment of the present invention.
[specific embodiment]
As shown in Figure 1, heat pipe 10 of the present invention comprises a body 12 and the porous capillary structure of being located at these body 12 internal faces.Wherein, this body 12 is made by the good metal material of heat conductivility such as copper etc., and the cross section of body shown in the figure 12 is rounded, is appreciated that ground, and the cross section of body 12 also can be other shape, as square, and polygon, ellipse etc.In addition, also be filled with hydraulic fluid (figure does not show) in the body 12, this hydraulic fluid generally adopts the liquid of low boiling, as water, alcohol etc.
These heat pipe 10 1 ends form evaporator section A, the other end forms condensation segment C, and can be at two sections intermediate arrangement adiabatic section B according to application need, this evaporator section A is used to receive the heat of extraneous thermal source, and the hydraulic fluid in the heat transferred pipe, makes its evaporation, this adiabatic section B is responsible for the transmission steam, and undertaking the effect heat insulation with the external world, the effect of this condensation segment C is the steam condensation that makes gaseous state, and heat is passed to outside the pipe by tube wall.
Porous capillary structure in this heat pipe 10 by the threeply degree about equally and mutually closely the sintered powder layer of contact constitute, along heat pipe 10 radially be followed successively by internal layer 14, intermediate layer 16, outer 18 to axis direction by body 12 inwalls, each layer sintered powder can be formed via sintering process by ceramic powders or metal dust such as copper powder etc.Wherein, each layer sintered powder forms three stage structure along axial (length direction) corresponding evaporator section A, the adiabatic section B of body 12 and condensation segment C, and the powder particle of each section varies in size, thus also difference of the pore size that in each section powder particle, forms; In addition, each layer sintered powder is not consistent on the axially-aligned of body 12 yet, make from evaporator section A, any one section radially seeing of adiabatic section B and condensation segment C along body 12, the different gradient-structure of also mutual stacked formation pore size between each layer sintered powder, thereby above-mentioned each layer sintered powder is along the axial three-dimensional pore structure that radially all forms graded that reaches of heat pipe, when heat pipe 10 work, utilize the hole of this porous capillary structure to be three-dimensional graded and adjust heat pipe character, the loose structure convection cell resistance that hole is bigger is little, and the capillary force of the less loose structure convection cell of hole is big, thereby reach the effect of low flow resistance and high capillary pressure difference, promote the overall performance of heat pipe 10.
Each layer thickness of porous capillary structure is even in the foregoing description, and the length of each section of each layer just in time with the evaporator section A of heat pipe 10, the length of adiabatic section B or condensation segment C is complementary, certainly in practice, can design the length of thickness and each section of each layer of each layer of porous capillary structure layer as required, in the heat pipe 20 that the present invention's second preferred embodiment is as shown in Figure 2 disclosed, layer 28 thickness minimum outside its porous capillary structure, intermediate layer 26 thickness maximums, internal layer 24 thickness are placed in the middle, in the heat pipe 30 that the present invention's the 3rd preferred embodiment and for example shown in Figure 3 is disclosed, each section of each layer of its porous capillary structure is designed to the three stage structure that is uneven in length, and makes and be the part kenel that staggers between each section of adjacent two layers.
In the foregoing description of the present invention, the porous capillary structure that is adopted all radially forms three-decker along heat pipe, and each layer axially forms three stage structure along heat pipe, certainly, according to actual needs, this porous capillary structure can also radially form structures two-layer or more than three layers along heat pipe, and each layer along heat pipe axially can also be more than two sections or three sections structure, and in each of each layer section, the powder particle size that is adopted between non-adjacent section can be inequality, but also can be identical.
Fig. 4 A to Fig. 4 C roughly comprises three steps for stating the manufacture method process schematic diagram of first embodiment on the sintered heat pipe of the present invention, is respectively preparation process, fills out powder step and integral sintered and subsequent processing steps, and it below is described in detail in detail.
At first, prepare ceramic powder particle or the metal powder granulates such as the copper powder etc. of multiple size, be formed in the body 12 for a minute echelon by modes such as screenings; Then, in the metal body of obtaining in advance 12, insert a plug 40a such as copper post, and in plug 40a and the formed space of body 12 inwalls, divide the multiple batches of different powder particle of size of inserting, and the fast preliminary sintering of work, so that the powder particle of being inserted body 12 axially on become multisection type arrange within layer 14, shown in Fig. 4 A, the purpose of this Fast Sintering is to make metal powder granulates temporarily to be connected on the body 12, it is unlikely along diffusing taking off on the body 12 after plug 40a extracts out, with the metallic copper powder is example, and this Fast Sintering temperature is generally about 630 ℃; Afterwards, extract plug 40a out and replace the less plug 40b of another size, shown in Fig. 4 B, then insert the different powder of granular size more in batches between plug 40b and the above-mentioned internal layer this moment, and make fast preliminary sintering, axially be the intermediate layer 16 that multisection type is arranged on the basis of above-mentioned internal layer, to form again along body 12; Then, extract plug 40b out and replace the less plug 40c of another size, and in inserting the different powder of granular size in batches between plug 40c and the above-mentioned intermediate layer, axially be the skin 18 that multisection type is arranged on the basis in above-mentioned intermediate layer, to form again along body 12, shown in Fig. 4 C, at this moment, powder particle is filled and is finished, can carry out integral sintered to the powder of being inserted, at the metallic copper powder, this integral sintered temperature is that the plug 40c that will insert for the last time after sintering is finished extracts out about 950 ℃; At last, charge into hydraulic fluid in body 12 cavitys, the back and this body 12 is carried out airtight of being evacuated promptly makes the described sintered heat pipe of first embodiment of the invention.
Certainly, above-mentioned manufacture method also is suitable for other embodiment of the present invention equally, such as when using plug that structure sheaf is carried out THICKNESS CONTROL, the size of choose reasonable plug that each time used can make the thickness heterogeneous texture of above-mentioned multiple layer formation as shown in above-mentioned second embodiment; And control when filling out powder at each section of each structure sheaf, its each section formation is uneven in length, as shown in above-mentioned the 3rd embodiment, and make and be the part kenel that staggers between each section of adjacent two layers.
Be appreciated that ground, when filling out powder, change the order of inserting of each section powder particle size, can obtain the porous capillary structure with three-dimensional gradient of more many types of attitude at each section of each layer; In addition, fall in the meal gap of inserting earlier for the fine powder of inserting after preventing, can separate by spray one deck high polymer binder between layer and layer or between each section of each layer, this binding agent is in pre-burning or finally can be fallen by burn off during sintering.
Need at last to illustrate, though only describe in the foregoing description at circular heat pipe, but be appreciated that ground, it is the heat pipe of other shape that the present invention can also adopt cross section, such as cross section is square, ellipse and polygon etc., therefore, the present invention's specification and claim described it " radially " and " axially " should be done the understanding of broad sense, promptly " radially " should be appreciated that into by inboard wall of tube body to the body cavity or by the direction of body cavity to inboard wall of tube body, and " axially " be construed as the body length direction.
Claims (10)
1. sintered heat pipe, it comprises the metal body, this inboard wall of tube body is provided with the porous capillary structure that sintered powder constitutes, it is characterized in that: this porous capillary structure radially forms multilayer architecture along heat pipe, and each layer is along the axially formation multi-segment structure of heat pipe, varying in size of sintered powder grains, each layer sintered powder is along the axial three-dimensional pore structure that radially all forms three-dimensional graded that reaches of heat pipe.
2. sintered heat pipe as claimed in claim 1 is characterized in that: this sintered powder is ceramic powders or copper powder.
3. sintered heat pipe as claimed in claim 1 is characterized in that: this porous capillary structure radially thickness of each layer forms heterogeneous texture.
4. sintered heat pipe as claimed in claim 1 is characterized in that: the multi-segment structure that each section of this each layer of porous capillary structure is designed to be uneven in length.
5. sintered heat pipe as claimed in claim 1 is characterized in that: be part between each section of this porous capillary structure adjacent two layers and stagger.
6. the manufacture method of a sintered heat pipe may further comprise the steps:
Preparation process, the powder particle that a metal body promptly is provided and has multiple size;
Fill out the powder step, promptly with the control of a plug as Laminate construction thickness, above-mentioned powder particle is inserted in batches to body, with axially forming multi-segment structure and making Fast Sintering at body, repeat this step and cause radially formation multiple layer along this body, each layer sintered powder along heat pipe axially and radially all form the three-dimensional pore structure of three-dimensional graded;
Integral sintered and subsequent processing steps is promptly done integral sinteredly after all powder is all inserted in the body, and the plug that will insert for the last time after sintering is finished is extracted out, and charges into airtight this body behind the hydraulic fluid in the body cavity.
7. the manufacture method of sintered heat pipe as claimed in claim 6 is characterized in that: this multiple layer forms the heterogeneous texture of thickness with plug control.
8. the manufacture method of sintered heat pipe as claimed in claim 6, it is characterized in that: each structure sheaf is controlled when filling out powder so that its each section formation is uneven in length.
9. the manufacture method of sintered heat pipe as claimed in claim 6 is characterized in that: control when filling out powder so that be the part kenel that staggers between each of adjacent two layers section.
10. the manufacture method of sintered heat pipe as claimed in claim 6, it is characterized in that: the powder particle that is provided is a copper powder, the temperature of Fast Sintering is about 630 ℃, and integral sintered temperature is about 950 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100341045A CN100395505C (en) | 2005-04-07 | 2005-04-07 | Sintering type heat pipe and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100341045A CN100395505C (en) | 2005-04-07 | 2005-04-07 | Sintering type heat pipe and manufacturing method thereof |
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| CN1844833A CN1844833A (en) | 2006-10-11 |
| CN100395505C true CN100395505C (en) | 2008-06-18 |
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| CNB2005100341045A Expired - Fee Related CN100395505C (en) | 2005-04-07 | 2005-04-07 | Sintering type heat pipe and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042779A (en) * | 2009-10-15 | 2011-05-04 | 索尼公司 | Heat transport device, method of manufacturing a heat transport device, and electronic apparatus |
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| CN101987361B (en) * | 2009-08-01 | 2013-06-26 | 中山伟强科技有限公司 | Manufacturing method and structure for heat pipe |
| CN103185478B (en) * | 2011-12-27 | 2016-08-10 | 富瑞精密组件（昆山）有限公司 | Flat hot pipe |
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| CN113290248B (en) * | 2021-05-07 | 2022-02-22 | 南京工业大学 | Preparation method of metal capillary core with multilayer structure |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4196504A (en) * | 1977-04-06 | 1980-04-08 | Thermacore, Inc. | Tunnel wick heat pipes |
| JPH09133485A (en) * | 1995-11-06 | 1997-05-20 | Mitsubishi Materials Corp | Heat pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102042779A (en) * | 2009-10-15 | 2011-05-04 | 索尼公司 | Heat transport device, method of manufacturing a heat transport device, and electronic apparatus |
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| CN1844833A (en) | 2006-10-11 |
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