CN100425935C - Heat pipe - Google Patents
Heat pipe Download PDFInfo
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- CN100425935C CN100425935C CNB200410015594XA CN200410015594A CN100425935C CN 100425935 C CN100425935 C CN 100425935C CN B200410015594X A CNB200410015594X A CN B200410015594XA CN 200410015594 A CN200410015594 A CN 200410015594A CN 100425935 C CN100425935 C CN 100425935C
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- Prior art keywords
- heat pipe
- electromagnet
- heat
- hydraulic fluid
- magnetic powder
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Abstract
The present invention relates to a heat pipe which comprises a pipe body and a magnetic field in the axial direction of the heat pipe, wherein the pipe body comprises a shell body, capillary structures attached to the inner wall of the shell body, and working liquid; the heat pipe also comprises an evaporation end and a condensation end. The working liquid comprises magnetic powder, and preferably comprises nanometer magnetic powder of which the surface comprises an oxidation protective layer of 1 to 2 nm. The magnetic powder drives the working liquid to flow under the action of magnetic force so as to increase the flowability of the working liquid and enhance the heat transfer performance of the heat pipe.
Description
[technical field]
The invention relates to a kind of heat pipe, refer in particular to a kind of heat pipe that is applied to electronic element radiating.
[background technology]
Along with the constantly development of electronic information industry, electronic component running frequency and speed are also in continuous lifting.The heat that high-frequency high-speed will make electronic component produce is more and more, and temperature is also more and more higher, and how the heat with electronic component distributes, and to guarantee its normal operation, is the problem of industry in research always.Traditional radiating mode is the radiator conduction heat that relies on metal material merely, because the coefficient of heat conduction of metal is limited, causes the amount of thermal conduction of radiator under unit interval, unit volume also limited.Traditional simple metal radiator heat-dissipation mode can not satisfy the radiating requirements of golf calorific value electronic component.
Temperature remained unchanged when the technology personage utilized liquid to change between the vapour-liquid binary states in the industry for this reason, absorbed simultaneously or the operation principle of emitting big calorimetric has been invented heat pipe.Figure 1 shows that known heat pipe structure schematic diagram, heat pipe 120 comprises the tubular body 121 of a sealing low pressure, is provided with capillary structure 122 in this body 121 and is filled with an amount of hydraulic fluid 123.Heat pipe 120 1 ends are evaporator section 130, and the other end is a condensation segment 132, can arrange adiabatic section 131 according to need of work two sections centres.Hydraulic fluid 123 carburation by evaporations when heat pipe 120 evaporator sections 130 are heated in the capillary structure 122, steam condenses into liquid after condensation segment 132 is emitted heat flowing under the small pressure reduction, liquid is back to evaporator section 130 under capillary structure 122 capillary force effects, thereby makes heat reach condensation segment 132 rapidly by heat pipe 120 evaporator sections 130.Heat pipe 120 utilizes the vapour of hydraulic fluid 123, liquid two phase change a large amount of heats can be transmitted at a distance by its less sectional area, and thermal resistance is less, have good isothermal performance and high heat-conducting property, compare with metals such as copper, silver, aluminium, the heat pipe 120 of Unit Weight can transmit the heat of several magnitude.
But the heat transfer of this heat pipe 120 is subjected to the restriction that many factors are heat transport limitation, and heat transport limitation comprises the capillary limit, the boiling limit, sonic limit and the stickiness limit etc.Figure 2 shows that known heat pipe 120 heat transport limitation schematic diagrames.Among Fig. 2 with on heat pipe 120 cross sections axially mean heat flux q be ordinate, the temperature difference (T at heat pipe 120 two ends
o-T
l) be abscissa, when heat pipe 120 two ends temperature differences are zero, there is not the transmission of heat, have even temperature in the heat pipe 120; Condensation segment 1 32 as heat pipe 120 is cooled to T
l＜T
o, and the evaporator section 130 of heat pipe 120 still keeps T
oConstant, then hot-fluid is along with (T
o-T
l) increase and increase fast, 0～1 section slope is very big among the figure, illustrates that heat pipe 120 has sizable thermal conductivity, it may go up several magnitude greatly than the copper rod of same size; When reaching at 1, thermal conductivity drops to almost nil suddenly, and this decline may be because capillary structure 122 can not provide enough hydraulic fluids 123 to turn back to evaporation ends 130, the capillary limit promptly occurred; It is overheated also to may be due to tube wall, the generation of bubbles and growing up in the capillary structure 122, thus blocked the backflow of hydraulic fluid 123, promptly reach the cause of the boiling limit.The generation of both of these case all can cause hydraulic fluid 123 to reflux not enough and reduce the heat transfer property of heat pipe 120 greatly, though by changing the effect increase backflow hydraulic fluid 123 that capillary structure 122 can promote capillary force, but every kind of capillary structure 122 all has its limit, so it is limited to increase hydraulic fluid 123 amounts of backflow, and difficulty of processing is big, cost is high, therefore can not tackle the problem at its root; The appearance of steady section 2 is owing to situation that steam flows has hindered the limit that the increase of hot-fluid occurs, can be divided into two types: if flowing of playing a major role of inertia force, steam may leave evaporator section 130 with the velocity of sound, produce choking phenomenon in evaporator section 130 exits, cause hot-fluid to increase promptly having produced sonic limit thereby make steam can not smooth and easyly flow to condensation segment 132; Another kind may be flowing of playing a major role of viscous flow, when the operating temperature of heat pipe 120 is lower than the normal temperature range of heat pipe 120, the pressure of steam is because the condensation segment that acts on heat pipe 120 132 of stickiness power reduces to zero, and axially hot-fluid constantly increases along with the continuous reduction of condensation segment 132 internal pressures, no longer increases and has produced the stickiness limit when steam pressure will arrive when zero axial hot-fluid at last.The existence of heat transport limitation greatly reduces the heat-transfer capability of heat pipe 120.Heat transport limitation is the principal element that influences heat pipe 120 heat transfer properties, thereby the flowability that how to overcome the heat transport limitation of heat pipe 120 and then increase hydraulic fluid 123 is to improve the key of heat pipe 120 performances.
[summary of the invention]
The object of the present invention is to provide a kind of heat pipe that can overcome heat transport limitation, can improve the hydraulic fluid flowability.
The objective of the invention is to be achieved through the following technical solutions: the magnetic field device that can produce magnetic field of at least one end of body that heat pipe of the present invention comprises a body and is arranged at heat pipe on axially, this body comprises a housing, is attached at the capillary structure and the hydraulic fluid of inner walls, and this heat pipe comprises an evaporation ends and a condensation end.This body has turnover.Wherein contain magnetic powder in this hydraulic fluid, contain nano-magnetic powder the best of 1-2nm oxide protective layer with the surface, above-mentioned magnetic powder drives hydraulic fluid and flows under magneticaction.
Compared with prior art, add magnetic powder in the hydraulic fluid of heat pipe of the present invention, utilizing the axial magnetic field of heat pipe to quicken magnetic powder moves in heat pipe, thereby driving hydraulic fluid quickens to flow in heat pipe, can overcome in the heat pipe owing to the mobile not enough heat transport limitation that causes of hydraulic fluid, raising Heat Transfer of Heat Pipe on Heat Pipe performance; Simultaneously, utilize the magnetic field of heat pipe on axially can control hydraulic fluid and quicken to flow, thereby heat pipe of the present invention can overcome the gravity effect and not limited by service orientation, has multidirectional, helps the extensive use of heat pipe to a certain direction.
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
[description of drawings]
Fig. 1 is the structural representation of known heat pipe.
Fig. 2 is the schematic diagram of the known Heat Transfer of Heat Pipe on Heat Pipe limit.
Fig. 3 is the schematic diagram of heat pipe first embodiment of the present invention.
Fig. 4 is the cutaway view of heat pipe first embodiment of the present invention.
Fig. 5 is the schematic diagram of heat pipe second embodiment of the present invention.
Fig. 6 is the schematic diagram of heat pipe the 3rd embodiment of the present invention.
[specific embodiment]
Fig. 3 and Figure 4 shows that first embodiment of heat pipe of the present invention, this heat pipe comprises a body 10 and is arranged at two electromagnet 20 at body 10 two ends respectively.Body 10 comprises a housing 11, is closely attached to the capillary structure 12 and the hydraulic fluid 13 of housing 11 inwalls; this hydraulic fluid 13 is selected the liquid that heat of vaporization height, good fluidity, chemical property are stable, boiling point is lower usually for use; as water, ethanol, methyl alcohol, acetone etc.; and add magnetic powder 14 in hydraulic fluid 13, this magnetic powder 14 contains nano-magnetic powder the best of 1-2nm oxide protective layer with the surface.Housing 11 is made by non-strong magnetic material, and heat resistant material commonly used at present is nonmagnetic substance mostly, as materials such as copper, aluminium.The capillary structure 12 of being close to body 11 inwalls is with slot type structure the best, but because of utilizing nano-magnetic powder 14, so capillary structures such as other sintering, silk screen core also can.During heat pipe work, make electromagnet 20 energisings of body 10 1 ends produce magnetic field, and the electromagnet 20 of body 10 other ends is not had magnetic, makes magnetic powder 14 flow to body 10 under magneticaction and has magnetic one end, flows to this and has magnetic one side thereby quicken hydraulic fluid 13; Former electromagnet 20 outages with magnetic of body 10 1 ends are lost magnetism, and make former electromagnet 20 energisings that do not have magnetic of body 10 other ends produce magnetic, have magnetic one side thereby acceleration hydraulic fluid 13 flows to this.So switch type makes electromagnet 20 energisings, can quicken hydraulic fluid 13 and flow back and forth in body 10.
For further specifying heat pipe advantage of the present invention, please refer to the known heat pipe 120 heat transport limitation schematic diagrames of Fig. 2.When reaching at 1 since the appearance of the capillary limit or the boiling limit that the thermal conductivity of heat pipe 120 is dropped to suddenly is almost nil, the generation of both of these case all is because hydraulic fluid 123 refluxes not enough and reduces the heat transfer property of heat pipe 120 greatly.Heat pipe utilization of the present invention adds the mobilization dynamic that magnetic force increases hydraulic fluid 13, promptly by electromagnet 20 produce along the axial magnetic field of body 10, make magnetic powder 14 under magneticaction, flow to evaporation ends, thereby drive hydraulic fluid 13 and quicken to be back to evaporation ends, under capillary force and magnetic force acting in conjunction, make evaporation ends have enough hydraulic fluids 13, with the boiling limit heat pipe thermal conductivity is significantly increased thereby overcome the capillary limit.The appearance of steady section 2 is owing to situation that steam flows has hindered the limit that the increase of hot-fluid occurs among Fig. 2, be the sonic limit or the stickiness limit, these two kinds of limit be that hydraulic fluid 13 owing to steam state lacks power and can not flow to the performance that condensation end influences heat pipe rapidly.Heat pipe of the present invention makes magnetic powder 14 stressed body 10 1 ends that flow to by the magnetic field that electromagnet 20 produces, can quicken flowing or flowing to condensation end of block airflow, promote the thermal conductivity of heat pipe thereby the flowability that increases hydraulic fluid 13 overcomes sonic limit and the stickiness limit for air-flow provides magnetomotive.
Figure 5 shows that the second embodiment schematic diagram of heat pipe of the present invention, the difference of the present embodiment and first embodiment is only to use in the present embodiment electromagnet 20, and this electromagnet 20 is arranged at body 10 evaporation ends 30 1 sides.Heat pipe tilt to use and causes evaporation ends 30 to be positioned at the top and condensation end 40 is positioned at the below through regular meeting; owing to being subjected to the gravity effect heat pipe to only depend on the capillary force effect can not provide enough hydraulic fluids 13 to be back to evaporation ends 30 the capillary limit taking place, influences the radiating effect of heat pipe.Present embodiment can overcome the problem of evaporation ends 30 hydraulic fluids 13 deficiencies that cause owing to the capillary limit, magnetic powder 14 flows to evaporation ends 30 during use under the effect in the magnetic field that electromagnet 20 produces, overcome gravity drive hydraulic fluid 13 and be back to evaporation ends 30, compare this enforcement power with first embodiment and be suitable for the unidirectional capillary limit that overcomes.
Figure 6 shows that the 3rd embodiment schematic diagram of heat pipe of the present invention, the difference of present embodiment and preceding two embodiment is that tube body of heat pipe 10A uses four electromagnet 20A, 20B, 20C and 20D because of turnover in the present embodiment.Can give one or two electromagnet energising according to a graded during use, as only giving electromagnet 20D energising then only for earlier electromagnet 20C energising or hydraulic fluid being quickened from electromagnet 20D that electromagnet 20A at one end flows to institute at one end for simultaneously electromagnet 20C and 20D energising; Otherwise, as only giving electromagnet 20A energising then only for earlier electromagnet 20B energising or hydraulic fluid being quickened from electromagnet 20A that electromagnet 20D at one end flows to institute at one end for simultaneously electromagnet 20B and 20A energising.
Above-mentioned three specific embodiments that embodiment is a heat pipe of the present invention, but heat pipe of the present invention is not limited in this, also can increase electromagnet quantity according to actual needs such as heat pipe turnover or heat pipe length, thereby increase the magnetic field effect and increase the Heat Transfer of Heat Pipe on Heat Pipe performance, and electromagnet also can be arranged at inside heat pipe with the into a single integrated structure electromagnet that is about to of heat control, makes the electromagnet energising produce magnetic field to reach identical purpose.
As previously mentioned; add the nano-magnetic powder in the hydraulic fluid of heat pipe of the present invention; the nano-magnetic powder the best that contains the oxide protective layer of 1～2nm with the surface; utilize that the electromagnet of heat pipe end produces along the axial magnetic field of heat pipe; magnetic powder is moved in heat pipe under the effect of magnetic field force, in heat pipe, quicken to flow thereby drive hydraulic fluid.So heat pipe of the present invention can utilize externally-applied magnetic field that the active force of magnetic powder is overcome the Heat Transfer of Heat Pipe on Heat Pipe limit and improves the Heat Transfer of Heat Pipe on Heat Pipe performance; Simultaneously, heat pipe of the present invention utilizes electromagnet can control hydraulic fluid and quickens to flow to a certain direction, thereby heat pipe of the present invention can overcome the gravity effect and not limited by service orientation, helps the extensive use of heat pipe.
Claims (5)
1. heat pipe, comprise body, this body comprises a housing, is attached at the capillary structure and the hydraulic fluid of inner walls, and this heat pipe comprises an evaporation ends and a condensation end, it is characterized in that: this body has a turning point, contains magnetic powder in this hydraulic fluid, and at least one end of the body of described heat pipe axially is provided with the magnetic field device that can produce magnetic field, and this turning point is provided with an electromagnet, and above-mentioned magnetic powder drives hydraulic fluid and flows under magneticaction.
2. heat pipe as claimed in claim 1 is characterized in that: be respectively equipped with an electromagnet at the body two ends.
3. heat pipe as claimed in claim 1 is characterized in that: be provided with an electromagnet at the heat pipe evaporation ends.
4. heat pipe as claimed in claim 1 is characterized in that: this electromagnet and body are made one and are arranged at the body inside of heat pipe.
5. heat pipe as claimed in claim 1 is characterized in that: this magnetic powder contains the nano-magnetic powder of the oxide protective layer of 1～2nm for the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410015594XA CN100425935C (en) | 2004-03-02 | 2004-03-02 | Heat pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410015594XA CN100425935C (en) | 2004-03-02 | 2004-03-02 | Heat pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1664485A CN1664485A (en) | 2005-09-07 |
| CN100425935C true CN100425935C (en) | 2008-10-15 |
Family
ID=35035685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410015594XA Expired - Fee Related CN100425935C (en) | 2004-03-02 | 2004-03-02 | Heat pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100425935C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI405944B (en) * | 2010-12-30 | 2013-08-21 | Kinik Co | Heat dissipation device |
| US11454249B2 (en) | 2020-01-14 | 2022-09-27 | Acer Incorporated | Heat dissipation fan |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107131675B (en) * | 2017-06-05 | 2020-09-25 | 青岛海尔智能技术研发有限公司 | Processing method of heat pipe assembly with magnetic refrigeration function |
| CN107490311B (en) * | 2017-07-25 | 2019-06-21 | 中国船舶重工集团公司第七一九研究所 | Self-driving type magnetic fluid heat exchanger |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5582291A (en) * | 1978-12-19 | 1980-06-20 | Matsushita Electric Ind Co Ltd | Heat pipe |
| JPS57108593A (en) * | 1980-12-25 | 1982-07-06 | Inoue Japax Res Inc | Heat pipe |
| US4366857A (en) * | 1981-04-28 | 1983-01-04 | The United States Of America As Represented By The Secretary Of The Air Force | Magnetic two-phase thermosiphon |
| JPS61143690A (en) * | 1984-12-17 | 1986-07-01 | Sumitomo Electric Ind Ltd | Heat pipe |
| JPH02101391A (en) * | 1988-10-07 | 1990-04-13 | Fujikura Ltd | Top heat type heat pipe |
| JPH0814779A (en) * | 1994-06-30 | 1996-01-19 | Sharp Corp | Heat pipe |
| JPH08299376A (en) * | 1995-05-01 | 1996-11-19 | Ito Junko | Heat treatment device with the use of heat pipe |
-
2004
- 2004-03-02 CN CNB200410015594XA patent/CN100425935C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5582291A (en) * | 1978-12-19 | 1980-06-20 | Matsushita Electric Ind Co Ltd | Heat pipe |
| JPS57108593A (en) * | 1980-12-25 | 1982-07-06 | Inoue Japax Res Inc | Heat pipe |
| US4366857A (en) * | 1981-04-28 | 1983-01-04 | The United States Of America As Represented By The Secretary Of The Air Force | Magnetic two-phase thermosiphon |
| JPS61143690A (en) * | 1984-12-17 | 1986-07-01 | Sumitomo Electric Ind Ltd | Heat pipe |
| JPH02101391A (en) * | 1988-10-07 | 1990-04-13 | Fujikura Ltd | Top heat type heat pipe |
| JPH0814779A (en) * | 1994-06-30 | 1996-01-19 | Sharp Corp | Heat pipe |
| JPH08299376A (en) * | 1995-05-01 | 1996-11-19 | Ito Junko | Heat treatment device with the use of heat pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI405944B (en) * | 2010-12-30 | 2013-08-21 | Kinik Co | Heat dissipation device |
| US11454249B2 (en) | 2020-01-14 | 2022-09-27 | Acer Incorporated | Heat dissipation fan |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1664485A (en) | 2005-09-07 |
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