CN103925819A - Through-hole metal foam heat pipe heat exchanger with gradually-changed appearance characteristics - Google Patents
Through-hole metal foam heat pipe heat exchanger with gradually-changed appearance characteristics Download PDFInfo
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- CN103925819A CN103925819A CN201410160416.XA CN201410160416A CN103925819A CN 103925819 A CN103925819 A CN 103925819A CN 201410160416 A CN201410160416 A CN 201410160416A CN 103925819 A CN103925819 A CN 103925819A
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- heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
- F28D15/046—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure characterised by the material or the construction of the capillary structure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a through-hole metal foam heat pipe heat exchanger with gradually-changed appearance characteristics and belongs to the technical field of rigid heat transfer bodies. The heat exchanger comprises a heat pipe and through-hole metal foam, wherein the through-hole metal foam is arranged on the inner wall of the heat pipe in a sintering mode, a heat insulation segment is arranged on the outer layer of the middle of the heat pipe, the two ends of the heat pipe serve as a cold end and a hot end respectively, and the cold end and the hot end are arranged in a heat exchange environment. The through-hole metal foam is structurally characterized in that internal through holes are of a structure with the density gradually changed; namely, if the porosity is not changed, the hole density is gradually increased or decreased in the vertical direction of the wall of the heat pipe, or if the hole density is not changed, the porosity is gradually increased or decreased in the vertical direction of the wall of the heat pipe, or if neither the hole density nor the porosity is changed, adopted materials are gradually changed layer by layer. By means of the heat exchanger, the heat exchange specific area is enlarged, flow and heat exchange of liquid gradually expanded under heat are facilitated, capillary force is increased, the heat pipe has higher heat exchange efficiency under the condition that the heat exchange effect is not affected, the consumption of metal materials is smaller, and the size is smaller.
Description
The application is application number: 201310051621.8, and denomination of invention: there is the open-pore metal foam heat pipe of gradual change shape characteristic, the applying date: 2013/2/17 divisional application.
Technical field
What the present invention relates to is a kind of device that utilizes rigidity thermal conductor technical field, specifically a kind of open-pore metal foam heat pipe with gradual change shape characteristic.
Background technology
Heat pipe be a kind of boiling and the two kinds of heat transfer elements that heat exchange mode combines that condense, be widely used in electronics,
The fields such as Aero-Space.If heat pipe is used in field of solar heat, can improve our environmental condition, promote the progress of China's energy-saving and emission-reduction work.And the heat exchange efficiency that how to improve heat pipe is the emphasis of current research work.Open-pore metal foam is a kind of novel porous material, its large (2000-10000m of heat exchange specific area
2/ m
3), relative density less (being the 2%-12% of solid material), has good mechanics and heat exchange property.Open-pore metal foam is made up of metallic framework and sinuous internal communication passage.Fluid is in the time of open-pore metal foam internal flow, by metallic framework disturbance, again because heat exchange specific area is large, the exchange heat of fluid and metal foam is very abundant, and the metallic framework with the good capacity of heat transmission can pass the heat of fluid fully, so open-pore metal foam is a kind of enhanced heat exchange material of excellent performance.
Through the retrieval of prior art is found, Chinese patent literature CN101338985, open day 2009-1-7, has recorded a kind of hot pipe type porous foamed metal heat exchanger, has solved the little problem of heat exchange area of heat pipe by the method for filling porous foam metal around the heat pipe in housing; Chinese patent literature CN102157468, open day 2011-8-17, record a kind of high-power loop heat pipe radiator and preparation method thereof, metal dust or the ceramic powders of the inner fixing high heat conduction of evaporimeter of this heat-pipe radiator, the steam (vapor) outlet that provides evaporating surface as much as possible and liquid evaporation to produce, to reach the object of enhanced water evaporation heat exchange.But above-mentioned prior art, mainly for metal foam or the porous media of even structure, can not make full use of the heat exchange property of metal foam, overall heat exchange efficiency is relatively low.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of open-pore metal foam heat pipe with gradual change shape characteristic is provided, solved the problems such as existing heat pipe heat exchanging efficiency is low, consumable quantity is many, volume is large.
The present invention is achieved by the following technical solutions, the present invention includes: heat pipe and foam are sintered in the open-pore metal foam of heat pipe inner wall, and wherein: the middle part skin of heat pipe is provided with adiabatic section, two ends are placed in respectively cold junction and the hot junction of heat exchange environment;
The structure of open-pore metal foam is: interior bone is the structure of dense degree gradual change, and porosity is identical, and hole density increases gradually or reduces along heat pipe wall vertical direction; Or hole density is identical, porosity increases gradually or reduces along heat pipe wall vertical direction; Or hole density and porosity are all identical, the material of use changes by layer.
The excursion of described hole density is 3PPI-130PPI.
The excursion of described porosity is 0.88-0.98.
Described material changes and refers to the various metals foam of arranging from high to low by thermal conductivity factor by layer.
Described open-pore metal foam preparation method is by investment casting, and its concrete steps comprise:
The first step, be that the polyurethane sponge that 3PPI-130PPI, porosity change scope are 0.88-0.98 is bonded into an entirety by stacked adding by hole variable density scope; Then be immersed in liquid refractory material, make refractory material be full of its space;
Second step, after refractory material sclerosis, heating is decomposed polyurethane sponge gasification, forms a three-dimensional framework space of having copied polyurethane sponge structure;
The 3rd step, point molten metal is poured in this casting mold, after metal freezing, removes refractory material and just can form the open-pore metal foam with gradual change shape characteristic;
In the time that preparation material is pressed the gradual change metal foam of layer variation, the each layer of metal foam preparing by the above-mentioned first step to the three steps welded together and be get final product by the method for soldering.
Described refractory material refers to: phenolic resins, mullite or gypsum.
Described metal refers to: aluminium, copper, nickel or other metal alloy.
Described heat pipe is for being obliquely installed.
Described heat pipe is circular or oval.
The present invention has improved the heat exchange property of heat pipe by the method for the open-pore metal foam that gradually changes in the dense degree of heat exchange wall sintering, increase heat exchange specific area, be conducive to the flow and heat transfer of the fluid expanding gradually because being heated, strengthen capillary force, make this heat pipe heat exchange efficiency in the situation that heat transfer effect is identical higher, metal consumptive material still less, volume is less.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of embodiment 1;
Fig. 3 is the structural representation of embodiment 3.
Detailed description of the invention
Below embodiments of the invention are elaborated, the present embodiment is implemented under taking technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the application comprises: heat pipe 1 and foam are sintered in the open-pore metal foam 2 of heat pipe 1 inwall, and wherein: the middle part skin of heat pipe 1 is provided with adiabatic section 3, two ends are placed in respectively cold junction and the hot junction of heat exchange environment;
The structure of open-pore metal foam 2 is: interior bone is the structure of dense degree gradual change, and porosity is identical, and hole density increases gradually or reduces along heat pipe 1 wall vertical direction; Or hole density is identical, porosity increases gradually or reduces along heat pipe 1 wall vertical direction; Or hole density and porosity are all identical, the material of use changes by layer.
The excursion of described hole density is 3PPI-130PPI.
The excursion of described porosity is 0.88-0.98.
Described material changes and refers to the various metals foam of arranging from high to low by thermal conductivity factor by layer.
Described open-pore metal foam 2 preparation methods are by investment casting, and its concrete steps comprise:
The first step, be that the polyurethane sponge that 3PPI-130PPI, porosity change scope are 0.88-0.98 is bonded into an entirety by stacked adding by hole variable density scope; Then be immersed in liquid refractory material, make refractory material be full of its space;
Second step, after refractory material sclerosis, heating is decomposed polyurethane sponge gasification, forms a three-dimensional framework space of having copied polyurethane sponge structure;
The 3rd step, point molten metal is poured in this casting mold, after metal freezing, removes refractory material and just can form the open-pore metal foam 2 with gradual change shape characteristic;
In the time that preparation material is pressed the gradual change metal foam of layer variation, the each layer of metal foam preparing by the above-mentioned first step to the three steps welded together and be get final product by the method for soldering.
Described refractory material refers to: phenolic resins, mullite or gypsum.
Described metal refers to: aluminium, copper, nickel or other metal alloy.
In heat-exchanger rig as shown in Figure 1, the variation of open-pore metal foam 2 consistencies is dredged in the middle of being, denser near 1 two inwalls of heat pipe.Can reasonably utilize like this heat exchange alternation performance of open-pore metal foam 2 and fluid, for the fluid of expanded by heating provides the suitable flowing space.In the hot junction of heat pipe 1, can there is more liquid evaporation; At cold junction, there is more steam condensation to become liquid.Due to very dense near wall open-pore metal foam 2, capillary force is very strong, and the liquid energy fast repairing of condensation is charged to hot junction, thereby can strengthen greatly heat exchange.
Embodiment 1
As shown in Figure 2, the open-pore metal foam 2 of the present embodiment is 5 layers of foam: the first through hole copper froth bed 4, the second through hole copper froth bed 5, third through-hole copper froth bed 6, fourth hole copper froth bed 7 and fifth hole copper froth bed 8.
The first through hole copper froth bed 4 hole density are 40PPI; The second through hole copper froth bed 5 hole density are 30PPI; Third through-hole copper froth bed 6 hole density are 20PPI; Fourth hole copper froth bed 7 hole density are 10PPI; Fifth hole copper froth bed 8 hole density are 5PPI.
Investment casting concrete steps:
The first step, the polyurethane sponge that hole density is respectively to 40PPI, 30PPI, 20PPI, 10PPI and 5PPI are bonded into an entirety by stacked adding; Then be immersed in liquid refractory material, make refractory material be full of its space;
Second step, after refractory material sclerosis, heating is decomposed polyurethane sponge gasification, forms a three-dimensional framework space of having copied polyurethane sponge structure;
The 3rd step, copper point molten metal is poured in this casting mold, after metal freezing, removes refractory material and just can form the open-pore metal foam 2 with gradual change shape characteristic;
Described refractory material refers to: phenolic resins, mullite or gypsum.
Embodiment 2
Described heat pipe 1 is for being obliquely installed.Can select high density holes 130PPI near the hole density of the open-pore metal foam 2 of heat pipe 1, relatively want larger porosity to select along the vertical inside hole variable density gradient of wall lower by 0.88, material is selected the higher metal of thermal conductivity factor, as fine copper, and brass etc., like this, in hot junction, dense near the open-pore metal foam 2 of heat pipe 1, the nucleus of boiling is many, in addition dense degree variable gradient is large, is more conducive to gas and concentrates and rise to cold junction fast to heat pipe 1 middle part; At cold junction, more steam can be taken away more heat by the external world by the dense metallic framework near heat pipe 1 wall, and condensation efficiency is higher.If heat pipe 1 heat exchange amount is little, can, according to the variable gradient of the dense degree of corresponding reduction metallic framework, also can reduce the inclined degree of heat pipe 1, reduce the effect of gravity to withdrawing fluid.Adiabatic section 3 materials can be selected ceramic fibre or the glass fibre that heat-proof quality is good.Inner sintering has the coefficient of heat transfer of inclination heat pipe of gradual change metal foam than a high order of magnitude of general heat pipe.
Embodiment 3
As shown in Figure 3, described heat pipe 1 is circular or oval.The advantage of the present embodiment is, the air water exchange of hot junction and cold junction is undertaken by the round tube of both sides, and than single pipe, heat exchange efficiency is higher.And the present embodiment cold junction directly over, hot junction under, the withdrawing fluid after condensed is under the double action of dense metal foam capillary force and gravity, back-flow velocity is faster.Adiabatic section 3 materials can be selected the extraordinary ceramic fibre of heat-proof quality or glass fibre.Inner sintering has the circle of gradual change metal foam or the coefficient of heat transfer of elliptical heat pipe than a high order of magnitude of general heat pipe of the same type.
Claims (9)
1. one kind has the open-pore metal foam heat pipe of gradual change shape characteristic, it is characterized in that, comprise: heat pipe and foam are sintered in the open-pore metal foam of heat pipe inner wall, wherein: the middle part skin of heat pipe is provided with adiabatic section, two ends are placed in respectively cold junction and the hot junction of heat exchange environment;
The structure of open-pore metal foam is: interior bone is the structure of dense degree gradual change, and hole density is identical, and porosity increases gradually or reduces along heat pipe wall vertical direction.
2. heat-exchanger rig according to claim 1, is characterized in that, the excursion of described hole density is 3PPI-130PPI.
3. heat-exchanger rig according to claim 1, is characterized in that, the excursion of described porosity is 0.88-0.98.
4. heat-exchanger rig according to claim 1, is characterized in that, described material changes and refers to the various metals foam of arranging from high to low by thermal conductivity factor by layer.
5. heat-exchanger rig according to claim 1, is characterized in that, described open-pore metal foam preparation method is by investment casting, and its concrete steps comprise:
The first step, be that the polyurethane sponge that 3PPI-130PPI, porosity change scope are 0.88-0.98 is bonded into an entirety by stacked adding by hole variable density scope; Then be immersed in liquid refractory material, make refractory material be full of its space;
Second step, after refractory material sclerosis, heating is decomposed polyurethane sponge gasification, forms a three-dimensional framework space of having copied polyurethane sponge structure;
The 3rd step, point molten metal is poured in this casting mold, after metal freezing, removes refractory material and just can form the open-pore metal foam with gradual change shape characteristic;
In the time that preparation material is pressed the gradual change metal foam of layer variation, the each layer of metal foam preparing by the above-mentioned first step to the three steps welded together and be get final product by the method for soldering.
6. heat-exchanger rig according to claim 5, is characterized in that, described refractory material refers to: phenolic resins, mullite or gypsum.
7. heat-exchanger rig according to claim 5, is characterized in that, described metal refers to: aluminium, copper, nickel or other metal alloy.
8. according to the heat-exchanger rig described in claim 1-7 any one, it is characterized in that, described heat pipe is for being obliquely installed.
9. according to the heat-exchanger rig described in claim 1-7 any one, it is characterized in that, described heat pipe is circular or oval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410160416.XA CN103925819A (en) | 2013-02-17 | 2013-02-17 | Through-hole metal foam heat pipe heat exchanger with gradually-changed appearance characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410160416.XA CN103925819A (en) | 2013-02-17 | 2013-02-17 | Through-hole metal foam heat pipe heat exchanger with gradually-changed appearance characteristics |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100516218A Division CN103134365A (en) | 2013-02-17 | 2013-02-17 | Through hole metal foam heat pipe heat exchange device with gradient topographic characteristics |
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| Publication Number | Publication Date |
|---|---|
| CN103925819A true CN103925819A (en) | 2014-07-16 |
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ID=51144120
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410160416.XA Pending CN103925819A (en) | 2013-02-17 | 2013-02-17 | Through-hole metal foam heat pipe heat exchanger with gradually-changed appearance characteristics |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106090866A (en) * | 2016-06-13 | 2016-11-09 | 东南大学 | A kind of being applicable to becomes the steam generator under gravity environment |
| EP3750791A1 (en) * | 2014-11-13 | 2020-12-16 | Lockheed Martin Corporation | Pipe assembly comprising cellular structure with varying density |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09133485A (en) * | 1995-11-06 | 1997-05-20 | Mitsubishi Materials Corp | Heat pipe |
| CN101055153A (en) * | 2006-04-14 | 2007-10-17 | 富准精密工业(深圳)有限公司 | Heat pipe |
| CN100395504C (en) * | 2005-01-24 | 2008-06-18 | 富准精密工业(深圳)有限公司 | Porous structure layer for heat pipe and its making process |
| CN102878843A (en) * | 2011-07-15 | 2013-01-16 | 富瑞精密组件（昆山）有限公司 | Heat pipe |
-
2013
- 2013-02-17 CN CN201410160416.XA patent/CN103925819A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09133485A (en) * | 1995-11-06 | 1997-05-20 | Mitsubishi Materials Corp | Heat pipe |
| CN100395504C (en) * | 2005-01-24 | 2008-06-18 | 富准精密工业(深圳)有限公司 | Porous structure layer for heat pipe and its making process |
| CN101055153A (en) * | 2006-04-14 | 2007-10-17 | 富准精密工业(深圳)有限公司 | Heat pipe |
| CN102878843A (en) * | 2011-07-15 | 2013-01-16 | 富瑞精密组件（昆山）有限公司 | Heat pipe |
Non-Patent Citations (1)
| Title |
|---|
| 王录才等: "熔模铸造法通孔泡沫铝制备工艺研究", 《铸造》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3750791A1 (en) * | 2014-11-13 | 2020-12-16 | Lockheed Martin Corporation | Pipe assembly comprising cellular structure with varying density |
| CN106090866A (en) * | 2016-06-13 | 2016-11-09 | 东南大学 | A kind of being applicable to becomes the steam generator under gravity environment |
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Application publication date: 20140716 |