CN101839663A - Sintered flat plate heat pipe and manufacturing method thereof - Google Patents
Sintered flat plate heat pipe and manufacturing method thereof Download PDFInfo
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- CN101839663A CN101839663A CN201010170205A CN201010170205A CN101839663A CN 101839663 A CN101839663 A CN 101839663A CN 201010170205 A CN201010170205 A CN 201010170205A CN 201010170205 A CN201010170205 A CN 201010170205A CN 101839663 A CN101839663 A CN 101839663A
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Abstract
The invention relates to a sintered flat plate heat pipe. The sintered flat plate heat pipe comprises a metal shell and a porous capillary structure arranged inside the metal shell, wherein the metal shell is a sealed flat shell, and the porous capillary structure is connected with two inner walls of the sealed flat shell. The sintered flat plate heat pipe can save a support structure in the prior art so as to avoid the problems of pipe expansion and steam flow disturbance caused by the support structure. The invention also relates to a manufacturing method for the sintered flat plate heat pipe. The manufacturing method comprises the following steps of: A, cutting a hollow metal pipe with predetermined size and two open ends; B, beating the hollow metal pipe to form a flat shape; C, inserting a central bar into the metal pipe and filling metal powder into the flat metal shell; D, molding the filled metal powder into the porous capillary structure with sintering; and E, extracting the central bar, pressing and sealing the two ends of the metal pipe, and the like. The heat pipe obtained by the manufacturing method does not need to be welded with the support structure so as to avoid the problems of pipe expansion and steam flow disturbance caused by the support structure.
Description
Technical field
The present invention relates to a kind of heat transfer element and preparation method thereof, in particular to a kind of novel sintered formula flat-plate heat pipe and preparation method thereof.
Background technology
Along with the develop rapidly of electronic technology, transistorized integrated level is more and more higher, and the caloric value of chip all increases more day, and the electronic radiation technology receives publicity gradually.The electronic heating problem has following trend at present, and heat flow density is big, and especially local pyrexia amount is big, and the heat flux distribution inequality causes hot issue, as the heat dissipation problem of great power LED.In addition in the electronic equipment start-up course, emergent power moment rises violently easily, this all electronic component high frequency operation, high speed development the heat dissipation problem that must face.
Flat-plate heat pipe is to generally believe that can solve above-mentioned localized heat flows through height, the heat dissipation technology of hot issue occurs.Its essence is a kind of novel hot pipe technique, utilize working fluid low-temperature evaporation under the condition of vacuum, local heat is expanded rapidly to heat-dissipating space all around by steam, realize equal temp effect.Traditional flat-plate heat pipe technology is used two airtight housings of flat board butt joint formation that porous capillary structure, little groove or woven wire are arranged up and down, add support column in enclosure interior then, there is the machining cost height in this flat-plate heat pipe technology, the low shortcoming of welding yields.After also being arranged in addition, big caliber copper pipe sintering flattens, fill the production technology of supporting construction, though the welding airtightness problem of described method before having improved on a lot of like this degree, but because the supporting construction and the porous capillary structure of its filling are not one-body molded, in the reflow pyroprocess (promptly be combined into the pyroprocess of integral heat sink module) of flat-plate heat pipe in subsequent use, the phenomenon that occurs expand tube easily makes the distortion of module outward appearance.In addition, also there is the heat transport limitation problem in common flat-plate heat pipe, as the capillary force deficiency, and capillary structure and inner walls loose contact, supporting construction upsets steam and flows, and all makes the extensive use of flat-plate heat pipe technology bottleneck occur.For this reason, proposing a kind of novel flat-plate heat pipe structure and rational production technology is the active demand that the heat radiation industry continues development.
Summary of the invention
The present invention need be provided with supporting construction and upsets steam and flow and can cause problems such as expand tube and distortion in subsequent applications for overcoming in flat-plate heat pipe in the above prior art, a kind of sintered flat plate heat pipe that need not supporting construction is provided, it comprises metal shell and the porous capillary structure of the portion that sets within it, described metal shell is flat, the sealed at both ends sealing flat shell that becomes, and two inwalls of described porous capillary structure and described sealing flat shell are connected.
According to embodiment, also can adopt following optimized technical scheme:
The inside of described sealing flat shell is vacuum, and is packaged with working fluid.
Also be distributed with a series of steam channels in the described porous capillary structure.
Described metal shell is any in copper, copper alloy, aluminium, aluminium alloy and the nickel; Described porous capillary structure is that in copper powder, aluminium powder, nickel powder and the carbon nano powder any is through integral type sinter molding or extrusion modling.
Described a series of steam channel is parallel to each other and in described porous capillary structure, the shaft section of each steam channel be rectangle, circle, triangle and trapezoidal at least a; Described working fluid is any in water, kerosene, ethanol, methyl alcohol or the acetone.
The present invention also provides a kind of preparation method of sintered flat plate heat pipe, and it comprises the steps: that A. cuts the hollow metal tube of making pre-sizing and both ends open; B. flattening hollow metal tube is flat, makes the flat metal housing; C. insert center bar and added metal powder in described flat metal housing; D. sintering makes the metal dust of institute's filling be shaped to porous capillary structure, and is connected with the inwall of described flat metal housing; E. detach center bar, pressing metal tube two ends and do encapsulation process.
According to embodiment, also can adopt following optimized technical scheme:
Also be included in before the step C, earlier each center bar be installed on the positioning pedestal, by positioning pedestal each center bar is inserted step in the described flat metal housing then.
Also be reserved with interface during encapsulation process in the described step e,, and in described flat metal housing, inject hydraulic fluid, vacuumize then and seal by described liquid injection pipe by described joint weld liquid injection pipe.
Also after described encapsulation process, described flat metal housing is vacuumized leak detection.
Also comprise and vacuumizing after the leak detection the step of described sintered flat plate heat pipe shaping.
The invention has the beneficial effects as follows:
Sintered flat plate heat pipe of the present invention can save supporting construction of the prior art by using the flat metal shell of sealing, thereby has avoided the expand tube problem in the subsequent applications, and upset the steam flow field problem.
The preparation method of sintered flat plate heat pipe of the present invention, by in flat hollow metal housing, inserting center bar and added metal powder, through integral type sinter molding porous capillary structure, thereby avoided in heat pipe expand tube that welding supporting construction and supporting construction cause, upset the problem that steam flows.
The preparation method of sintered flat plate heat pipe of the present invention also has following further beneficial effect: (1) has kept the filling center bar of conventional heat pipe, fixedly sintering goes out the way of porous capillary structure, has adapted to traditional handicraft; (2) a series of steam channels of Xing Chenging effectively the steam of combing working fluid flow, reach better heat-transfer effect; (3) porous capillary structure between the steam channel also as support column, effectively solves the problem that prolonging in the follow-up use pressed or heat rises as when connecting capillary structure layer, the backflow of help working fluid up and down; (4) can also wait performance and the thickness of optimizing flat-plate heat pipe by shape, size, the spacing of steam regulation passage, satisfy diversified demand.
Description of drawings
Fig. 1 is the stereogram of the sintered flat plate heat pipe of one embodiment of the invention;
Fig. 2 is the cross section cross-sectional schematic of sintered flat plate heat pipe of the embodiment of Fig. 1;
Fig. 3 is that the edge of sintered flat plate heat pipe of embodiment of Fig. 1 is perpendicular to the cross-sectional view of steam channel direction;
Fig. 4 is the cross-sectional view that the edge of sintered flat plate heat pipe of the embodiment of Fig. 1 is parallel to the steam channel direction;
Fig. 5 is that the edge of sintered flat plate heat pipe of embodiment of Fig. 1 is perpendicular to the cross section cutaway view Amplified image of steam channel direction;
Fig. 6 is the partial enlarged drawing of Fig. 5;
Fig. 7-the 14th, the cross-sectional view of other embodiment of the present invention (having shown the application of various steam channel shape among the figure) perpendicular to the steam channel direction;
Perspective diagram when Figure 15 is preparation method of the present invention in center bar inserts the flat metal housing;
Figure 16 be the sintered flat plate heat pipe welding liquid injection pipe of one embodiment of the invention and seal after schematic diagram;
Figure 17 is the process chart of the preparation method of one embodiment of the invention;
Figure 18 is the process chart of the preparation method of a preferred embodiment of the invention.
The specific embodiment
Below in conjunction with specific embodiment and contrast accompanying drawing sintered flat plate heat pipe of the present invention is further described in detail.
Sintered flat plate heat pipe as shown in Figure 1, 2, 3 comprises the flat metal housing 1 after the punch forming, porous capillary structure 2, steam channel 3 and be filled in working fluid in the flat metal housing 1.Described porous capillary structure 2 is that metal dust is filled in the flat metal housing 1 that is interspersed with center bar in advance, and high temperature sintering forms.Behind the sintering, the last lower wall of porous capillary structure 2 and flat metal housing 1 closely, link together reliably.Described steam channel 3 is after sintering is finished, and forms when center bar detaches porous capillary structure 2, and it is abreast in porous capillary structure 2.And the porous capillary structure 2 between the steam channel 3 connects the last lower wall of airtight flat metal housing 1 simultaneously, and it both can make the working fluid of condensation be back to evaporating surface fast, plays supporting construction simultaneously again.The shaft section of described steam channel 3 can be the rectangles, circle, triangle, trapezoidal etc. of different sizes, shown in Fig. 7-14; Described porous capillary is tied 2 structures and can be formed by sintering such as copper powder, aluminium powder, nickel powder, carbon nano powder or extruding; Described metal dust can be that identical order is counted the powder of scope (being particle size) or the powder of different meshes scope (being particle size) forms; The described working fluid that is filled in the airtight flat metal housing 1 can be water, kerosene, ethanol, methyl alcohol or acetone etc., its in closed shell since the condition of vacuum can evaporate being lower than under the temperature of heating elements.Described flat metal housing 1 can be the metal material that copper, copper alloy, aluminium, aluminium alloy, nickel, stainless steel etc. have high-termal conductivity.
Be depicted as the operation mechanism of slug type flat-plate heat pipe of the present invention as Fig. 4,5,6, in the time of above flat-plate heat pipe is placed to euthermic chip, the working fluid that is filled in the flat metal housing 1 comes into operation, and low-temperature evaporation under the condition of vacuum is taken away the heat that euthermic chip produces.Working fluid flows to the two ends of flat metal housing 1 rapidly under the dredging of steam channel, above-mentioned process takes place a series of longitudinally steam channels 3 simultaneously, makes the heat of euthermic chip be evenly distributed to each position of flat metal housing 1.Regelation becomes liquid after working fluid steam is met cold release latent heat, and liquid relies on the capillary attraction suction of porous capillary structure 2 to return evaporation ends.So, then can form the cyclic process of working fluid on the vertical and horizontal shaft section both direction.Arrow is represented the flow direction of working fluid condensate liquid in the porous capillary structure 2, and arrow is represented the flow direction of working fluid steam in the steam channel 3.
Shown in Fig. 7-14, schematic diagram for the different steam passage structure of slug type flat-plate heat pipe of the present invention, illustrate that the present invention can produce the porous capillary structure of different steam channel shapes, spacing, size, to satisfy the heat radiation requirement of various types of flat plate heat pipe by regulating the center bar mould.
Below in conjunction with specific embodiment and contrast accompanying drawing the preparation method of sintered flat plate heat pipe of the present invention is further described in detail.
As shown in figure 17, be the making flow process of the sintered flat plate heat pipe of one embodiment of the invention, it comprises: A, according to the requirement of corresponding product cuts the hollow metal tube of making pre-sizing and both ends open; B. be required flat by punch forming process punching press hollow metal tube, make flat metal housing 1; C. in flat metal housing 1, insert several center bars 6 (quantity of desirable as required different center bar 6) and the secretion metal dust between each center bar 6; D. sintering makes that the metal dust integral molding of institute's filling is a porous capillary structure 3; E. detach the two ends of center bar 6, pressing metal tube and do encapsulation process.After above each step, can obtain flat one sintered flat plate heat pipe.Certainly, better for making molding effect, also can fill some buffer structures in pipe inside, or first thermoplastic metal tube before the punch forming.This integral type sintering method can make the porous capillary structure that forms closely link to each other with the flat metal housing, the effect that it not only can be used for the backflow of condensed working fluid but also can play supporting construction.
As shown in figure 18, be another preferred embodiment of the present invention.At first, size according to demand cuts out the hollow metal pipe of both ends open; And put into and strike out required flat metal housing 1 in the mould; Then the pedestal 5 that has a plurality of center bars 6 is inserted an end of flat metal housing 1, described center bar 6 according to predetermined being spaced, can be row on pedestal 5, also can be multiple row; Insert metal dust in the center bar 6 and the gap of flat metal housing 1, and carry out sintering; After sintering is finished, center bar 6 and pedestal 5 are detached from flat metal housing 1, this moment, flat metal housing 1 interior sintering obtained having the porous capillary structure 2 of a plurality of steam channels 3, last lower wall surface (end that does not have porous capillary structure 2) with flat metal housing 1 two ends links together by sealing the cutter pressing then, and the interface of reserving fluid injection and vacuumizing, again pressing place is sealed by welding; Liquid injection pipe 8 is welded to the interface of reservation, and carries out vacuum leak hunting; Vacuumize, seal and shaping at last by the cavity injection working fluid of liquid injection pipe 8 after the sealing, and to it, promptly finish the making of flat-plate heat pipe.
Above content is in conjunction with specifically implementing embodiment to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. sintered flat plate heat pipe, comprise metal shell and the porous capillary structure of the portion that sets within it, it is characterized in that: described metal shell is flat, the sealed at both ends sealing flat shell that becomes, and two inwalls of described porous capillary structure and described sealing flat shell are connected.
2. sintered flat plate heat pipe as claimed in claim 1 is characterized in that: the inside of described sealing flat shell is vacuum, and is packaged with working fluid.
3. sintered flat plate heat pipe as claimed in claim 2 is characterized in that: also be distributed with a series of steam channels in the described porous capillary structure.
4. as arbitrary described sintered flat plate heat pipe among the claim 1-3, it is characterized in that: described metal shell is any in copper, copper alloy, aluminium, aluminium alloy and the nickel; Described porous capillary structure is that in copper powder, aluminium powder, nickel powder and the carbon nano powder any is through integral type sinter molding or extrusion modling.
5. sintered flat plate heat pipe as claimed in claim 4 is characterized in that: described a series of steam channels are parallel to each other and in described porous capillary structure, the shaft section of each steam channel be rectangle, circle, triangle and trapezoidal at least a; Described working fluid is any in water, kerosene, ethanol, methyl alcohol or the acetone.
6. the preparation method of a sintered flat plate heat pipe is characterized in that comprising the steps:
A. cut the hollow metal tube of making pre-sizing and both ends open;
B. flattening hollow metal tube is flat, makes the flat metal housing;
C. insert center bar and added metal powder in described flat metal housing;
D. the integral type sintering makes the metal dust of institute's filling be shaped to porous capillary structure, and is connected with the inwall of described flat metal housing;
E. detach center bar, pressing metal tube two ends and do encapsulation process.
7. the preparation method of sintered flat plate heat pipe as claimed in claim 6 is characterized in that: also be included in before the step C, earlier each center bar be installed on the positioning pedestal, by positioning pedestal each center bar is inserted step in the described flat metal housing then.
8. as the preparation method of claim 6 or 7 described sintered flat plate heat pipes, it is characterized in that: also be reserved with interface in the described step e during encapsulation process, by described joint weld liquid injection pipe, and in described flat metal housing, inject hydraulic fluid by described liquid injection pipe, vacuumize then and seal.
9. as the preparation method of claim 6 or 7 or 8 described sintered flat plate heat pipes, it is characterized in that: also after described encapsulation process, described flat metal housing is vacuumized leak detection.
10. the preparation method of sintered flat plate heat pipe as claimed in claim 9 is characterized in that: also comprise the step that vacuumizes after the leak detection described sintered flat plate heat pipe shaping.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010170205A CN101839663A (en) | 2010-05-12 | 2010-05-12 | Sintered flat plate heat pipe and manufacturing method thereof |
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| CN201010170205A CN101839663A (en) | 2010-05-12 | 2010-05-12 | Sintered flat plate heat pipe and manufacturing method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297616A (en) * | 2011-08-15 | 2011-12-28 | 中山伟强科技有限公司 | Method for manufacturing thin heat pipe |
| CN103034306A (en) * | 2011-10-08 | 2013-04-10 | 联想(北京)有限公司 | Radiating workpiece and preparation method thereof and electronic device |
| CN103182509A (en) * | 2011-12-29 | 2013-07-03 | 北京有色金属研究总院 | Preparation method of porous capillary core for loop heat pipe |
| CN104422321A (en) * | 2013-08-22 | 2015-03-18 | 深圳市凯强热传科技有限公司 | Metal pipe, flat heat pipe and manufacturing method thereof |
| CN106077821A (en) * | 2016-07-18 | 2016-11-09 | 成都市壹佰刀具有限公司 | A kind of fine plain grinding technique of saw bit matrix |
| CN107421366A (en) * | 2017-09-12 | 2017-12-01 | 惠州市鼎丰泰科技有限公司 | A kind of aluminium alloy heat pipe and preparation method thereof |
| CN110530183A (en) * | 2019-10-16 | 2019-12-03 | 福建强纶新材料股份有限公司 | A kind of Flat heat tube structure |
| CN111761049A (en) * | 2019-04-01 | 2020-10-13 | 广州力及热管理科技有限公司 | Metal paste for manufacturing capillary structure in uniform temperature plate |
| CN112595155A (en) * | 2019-11-28 | 2021-04-02 | 华为技术有限公司 | Foldable temperature equalization plate and foldable electronic equipment |
| CN112756606A (en) * | 2021-04-07 | 2021-05-07 | 太仓市华盈电子材料有限公司 | Feeding bin structure for heat pipe feeding, heat pipe rod pulling device and rod pulling method |
| CN113218226A (en) * | 2021-04-29 | 2021-08-06 | 中南大学 | Thin deformable heat dissipation structure with aluminum capillary structure and preparation method thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102297616A (en) * | 2011-08-15 | 2011-12-28 | 中山伟强科技有限公司 | Method for manufacturing thin heat pipe |
| CN103034306A (en) * | 2011-10-08 | 2013-04-10 | 联想(北京)有限公司 | Radiating workpiece and preparation method thereof and electronic device |
| CN103034306B (en) * | 2011-10-08 | 2016-08-17 | 联想(北京)有限公司 | A kind of heat radiation workpiece and preparation method thereof and a kind of electronic equipment |
| CN103182509A (en) * | 2011-12-29 | 2013-07-03 | 北京有色金属研究总院 | Preparation method of porous capillary core for loop heat pipe |
| CN104422321A (en) * | 2013-08-22 | 2015-03-18 | 深圳市凯强热传科技有限公司 | Metal pipe, flat heat pipe and manufacturing method thereof |
| CN104422321B (en) * | 2013-08-22 | 2016-03-02 | 深圳市凯强热传科技有限公司 | Metal tube, flat plate type heat tube and manufacture method thereof |
| CN106077821A (en) * | 2016-07-18 | 2016-11-09 | 成都市壹佰刀具有限公司 | A kind of fine plain grinding technique of saw bit matrix |
| CN106077821B (en) * | 2016-07-18 | 2017-12-22 | 成都市壹佰刀具有限公司 | A kind of fine plain grinding technique of saw bit matrix |
| CN107421366A (en) * | 2017-09-12 | 2017-12-01 | 惠州市鼎丰泰科技有限公司 | A kind of aluminium alloy heat pipe and preparation method thereof |
| CN111761049A (en) * | 2019-04-01 | 2020-10-13 | 广州力及热管理科技有限公司 | Metal paste for manufacturing capillary structure in uniform temperature plate |
| CN111761049B (en) * | 2019-04-01 | 2022-08-05 | 广州力及热管理科技有限公司 | Metal paste for manufacturing capillary structure in uniform temperature plate |
| CN110530183A (en) * | 2019-10-16 | 2019-12-03 | 福建强纶新材料股份有限公司 | A kind of Flat heat tube structure |
| CN112595155A (en) * | 2019-11-28 | 2021-04-02 | 华为技术有限公司 | Foldable temperature equalization plate and foldable electronic equipment |
| CN112756606A (en) * | 2021-04-07 | 2021-05-07 | 太仓市华盈电子材料有限公司 | Feeding bin structure for heat pipe feeding, heat pipe rod pulling device and rod pulling method |
| CN113218226A (en) * | 2021-04-29 | 2021-08-06 | 中南大学 | Thin deformable heat dissipation structure with aluminum capillary structure and preparation method thereof |
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