CN105698578A

CN105698578A - Heat pipe

Info

Publication number: CN105698578A
Application number: CN201410706245.6A
Authority: CN
Inventors: 黄世霖; 陈秋恭; 吴斯文; 王体军
Original assignee: Delta Optoelectronics Inc
Current assignee: Delta Electronics Inc; Delta Optoelectronics Inc
Priority date: 2014-11-28
Filing date: 2014-11-28
Publication date: 2016-06-22
Also published as: CN110220404A; US20160153722A1

Abstract

The present invention provides a heat pipe. The heat pipe comprises a first pipe body and at least one second pipe body. The first pipe body is provided with an evaporation part, a heat insulation part and a condensation part. The evaporation part, the heat insulation part and the condensation part communicate with one another to define a hollow chamber. The two ends of the first pipe body in the axial direction of the heat pipe are both closed. The second pipe body is arranged in the hollow chamber. The second pipe body is provided with an accommodating space and a first capillary structure. The first capillary structure is arranged at the end, close to the evaporation part, of the accommodating space. The hollow chamber of the first pipe body is mainly a steam channel. The second pipe body is mainly a working fluid channel. According to the heat pipe, steam is driven to move from the evaporation part to the condensation part in the first pipe body through the steam pressure difference, and working fluid is driven to flow from the condensation part to the evaporation part in the second pipe body.

Description

Heat pipe

Technical field

The present invention relates to a kind of heat pipe, particularly to a kind of heat pipe utilizing vapor pressure differential to drive working fluid。

Background technology

Known heat pipe is mainly closed metal tube, its interior wick structure and the heat transfer fluid that is filled in metal tube by one and is formed, and keeps suitable vacuum in metal tube, to reduce the heat pipe startup temperature difference。The evaporation end (Evaporator) utilizing heat pipe is arranged at thermal source, make the heat that thermal source produces by fluid (liquid phase) evaporation endothermic (latent heat) in pipe vaporize (vapour phase), produced steam is driven the condensation part (Condenser) flowing to heat pipe by vapor pressure differential, namely steam condense in condensation part release latent heat and revert back to liquid phase, drives again through capillary force and is namely promptly gone out by conduction of heat by said structure through wick structure return evaporation part heat pipe。

Owing to heat pipe structure is simple and has the advantages such as high conduction performance, low thermal resistance, it is applied to already in electronics or other different field of radiatings。But, owing to electronic application product continues towards portable, lightening, 4K image, 4G transmission, the development of high additional function, caloric value is improved therewith, known heat pipe cannot meet this high heat and high heat-flux requirement, thus properties of hot pipe must be promoted further, such as by improveing the production method of capillary wick, or utilize combined capillary structure, to promote the capillary force of capillary structure body。But, the mode majority of those improvement needs more verbose production process and time, and the heat pipe structure formed is still excessively complicated, it is impossible to take into account cost and heat pipe effect simultaneously。

Furthermore, known heat pipe is when start circulates, steam is in opposite direction with working-fluid flow, and owing to steam and working fluid interface are not effectively isolated, working fluid must can return to evaporation part and again circulate after overcoming steam resistance again, so that heat pipe need to meet capillary restriction, namely internal capillary power have to be larger than steam pressure, fluid reflux resistance and gravity etc. with joint efforts, and heat pipe could constantly start circulation。

Therefore, how a kind of heat pipe is provided, under the basis of simple structural design, its hot biography amount can be promoted, and can effectively solve the demand of electronic product high heat and high heat-flux, it has also become one of important topic。

Summary of the invention

Because above-mentioned problem, the purpose of the present invention, for providing a kind of heat pipe, under the basis of simple structural design, can promote its hot biography amount, and can effectively solve the demand of electronic product high heat and high heat-flux。

For reaching above-mentioned purpose, according to a kind of heat pipe of the present invention, it includes one first body and at least one second body。First body has an evaporation part, an insulation and a condensation part。Evaporation part, insulation and condensation part are interconnected to define a hollow chamber。First body, two ends on the axial direction of this heat pipe are all closing。Second body is arranged at this hollow chamber。Second body has an accommodation space and one first capillary structure。First capillary structure is arranged at accommodation space one end near evaporation part。The hollow chamber of the first body is mainly steam channel, and this second body is mainly process fluid passages, this heat pipe drives steam to be moved from this evaporation part toward this condensation part in this first body with vapor pressure differential, and drives working fluid to be flowed from this condensation part toward this evaporation part in this second body。

In one embodiment, the second body is positioned at condensation part and whole insulation of the evaporation part of part, part。

In one embodiment, the second body is only located at the condensation part of part and whole insulation。

In one embodiment, the first body is uiform section in its cross section in the radial direction。

In one embodiment, the first capillary structure is formed from metal sintering powder, fiber or braiding mesh, or its combination。

In one embodiment, the first body also includes one second capillary structure。Second capillary structure is arranged at hollow chamber near evaporation part。

In one embodiment, the second capillary structure is formed from metal sintering powder, fiber or braiding mesh, or its combination。

In one embodiment, the first capillary structure and the second capillary structure are connected, or have part overlapped。

In one embodiment, the second capillary structure contacts with the first body inner tubal wall being positioned at evaporation part and/or the second body outer tube wall portion。

In one embodiment, the first capillary structure in the second body may extend to outside the second body。Being positioned at the second capillary structure outside the second body can all or part of cladding the first capillary structure of extending outside the second body。

In one embodiment, it is covered with the second body near the first capillary structure of evaporation part。

In one embodiment, the inner tubal wall of the first body contacts the outer tube wall of the second body。

In one embodiment, heat pipe also includes multiple second body。Second body is arranged adjacent in the first body。

From the above, the heat pipe of the present invention is owing to having one first body and arranging one second body in the inner, and one first capillary structure is set by one end of evaporation part close in the second body, to stop opposing steam flow to enter in the second body, and workflow physical ability is made to carry in the second body with one direction。Owing to this structure is upper relatively simple in making, therefore can improve quality and yield that heat pipe makes, and cost can be reduced。Additionally, the heat pipe of the present invention improves the efficiency of inside heat pipe liquid vapour cycle with the structure of inner and outer pipes form, and then the heat promoting heat pipe passes ability, is particularly suitable for being beneficial to the thermal shock of opposing transient state, it is possible to effectively solve high heat and high heat-flux requirement。

Accompanying drawing explanation

Figure 1A is the partial appearance schematic diagram of a kind of heat pipe of present pre-ferred embodiments。

Figure 1B is the schematic cross-section of the Section A-A line of the heat pipe shown in Figure 1A。

Fig. 1 C is the schematic appearance after flattening processes of the heat pipe shown in Figure 1A。

Fig. 1 D is the schematic cross-section of the section B-B line of the heat pipe shown in Fig. 1 C。

Fig. 1 E is the representative side section view of the heat pipe shown in Figure 1A。

Fig. 1 F is the representative side section view of a kind of heat pipe of another embodiment of the present invention。

The partial appearance schematic diagram of the heat pipe of Fig. 2 A～Fig. 2 C respectively other embodiments of the invention。

Fig. 3 A is the partial appearance schematic diagram of the heat pipe of other embodiments of the invention。

Fig. 3 B is the schematic diagram that the heat pipe shown in Fig. 3 A carries out flattening process。

Fig. 3 C is the schematic cross-section after flattening processes of the heat pipe shown in Fig. 3 A。

Fig. 4 A is the partial appearance schematic diagram of the heat pipe of another embodiment of the present invention。

Fig. 4 B is the schematic cross-section of the C-C section line of the heat pipe shown in Fig. 4 A。

Wherein, description of reference numerals is as follows:

H, H1, H2, H3, H4, H5, H6: heat pipe

1, the 1a, 1b, 1c, 1d, 1e, 1f: first body

10,10b, 10c, 10f: hollow chamber

11,12,11e, 12e: end

13b, 13c, 13d, 13e: the second capillary structure

14d, 14e: inner tubal wall

2, the 2a, 2b, 2c, 2d, 2e, 2f: second body

20: accommodation space

21, the 21b, 21c, 21d, 21e: first capillary structure

24d, 24e: outer tube wall

A: insulation

A-A, B-B, C-C: section line

C: condensation part

D1: axial direction

D2: radial direction

E: evaporation part

Detailed description of the invention

Hereinafter with reference to relevant drawings, a kind of heat pipe according to present pre-ferred embodiments being described, wherein identical element will be illustrated with identical reference marks。

Figure 1A is the partial appearance schematic diagram of the heat pipe of present pre-ferred embodiments, Figure 1B is the schematic cross-section of the Section A-A line of the heat pipe shown in Figure 1A, please also refer to shown in Figure 1A and Figure 1B, in the present embodiment, heat pipe H has one first body 1 and at least one second body 2, and the present embodiment illustrates for one second body 2。Wherein, the first body 1 has a hollow chamber 10, and the second body 2 is arranged in hollow chamber 10, and the hollow chamber 10 of the first body 1 is steam channel, and the second body 2 is process fluid passages。

In the present embodiment, the first body 1 is the Slim hollow body of an oval column, and the cross section that the first body 1 is on its radial direction D2 is uiform section。First body 1 can be such as fabricated by by copper, silver, aluminum, its alloy or other metal material with good heat conductivity。In practical application, except being provided with the second body 2 in first body 1, comprising in addition working fluid (not shown go out), working fluid can be that inorganic compound, alcohols, ketone, liquid metal, cold coal, organic compound or its mixture are all the working fluid described for any fluid being beneficial to evaporative heat loss。It addition, all non-limiting person of the shape of the first body 1, size, for instance can being cylindrical tube or rectangular body, end be looked the environment of its setting, space, heat conduction amount and temperature and is determined。

Fig. 1 C is the schematic appearance after flattening processes of the heat pipe shown in Figure 1A, and Fig. 1 D is the schematic cross-section of the section B-B line of the heat pipe shown in Fig. 1 C。Please also refer to shown in Figure 1A, Fig. 1 C and Fig. 1 D, second body 2 is arranged in the hollow chamber 10 of the first body 1 by the forming method of the heat pipe H of the present embodiment, after working fluid injects, the first body 1 and the second body 2, to complete the making of heat pipe H, and are flattened rear process formings such as (flaky process) by evacuation simultaneously again；Or, also first to water filling again after the first body 1 and the second body 2 evacuation, the making of heat pipe H can be completed, the present invention does not limit in this。In other words, two ends 11,12 on the axial direction D1 of first body 1 of the heat pipe H of the present embodiment are all closing。

Refer to equally shown in Figure 1A to Fig. 1 D, second body 2 of heat pipe H has accommodation space 20 and one first capillary structure 21, and the first capillary structure 21 is arranged at the accommodation space 20 of only part。For the present embodiment, the first capillary structure 21 is arranged at the accommodation space 20 side near evaporation part E, and it is also preferred that the left the first capillary structure 21 be distributed in accommodation space 20 near heat pipe H end 11 about second body 2 1/3 length。

Further illustrating, first capillary structure 21 of the present embodiment is in the second outer formation of body 2。Specifically, first first capillary structure 21 forms in outside the first body 2, its forming mode can such as but not limited to including the mode such as high temperature sintering and/or ejection formation, and before the first capillary structure 21 is arranged at the second body 2, porosity (porosity) and the permeability of the first capillary structure 21 is controlled suitably by those forming modes, working fluid return is enable to increase to the amount of evaporator section, and then the capillary force of lifting capillary structure, and it is effectively increased maximum heat biography amount (Qmax) of heat pipe。

It is in metal tube, arrange middle plug fix metal dust compared to the formation of the wick structure of known heat pipe, and the molding via high temperature sintering, the cost of required middle plug is high, and all it is likely to result in losing of plug in the technique sintering or pulling out plug, even destroy capillary structure, and then have influence on the quality of properties of hot pipe, first capillary structure 21 of the present invention first shapes in outside, the shape of capillary structure can be designed according to performance requirement, will not be subject to the restriction of mandrel process during tradition must utilize；And it is also preferred that the left the quality of the first capillary structure 21 first can be screened outside the second body 2, get rid of defective products in advance, to promote the yield of heat pipe H。

Formation about first capillary structure 21 of the present embodiment is not restriction in the above described manner, when practical application, first capillary structure 21 is except can be that above-mentioned formation is from metal sintering powder, it also can be fiber (fiber) or braiding mesh (mesh), or its combination, look closely the demand of technique and heat radiation and select。

Furthermore, second body 2 of the heat pipe H of the present embodiment is owing to having the first capillary structure 21, it is possible to effectively stop opposing steam flow to enter in the second body 2, carries in the second body 2 so that workflow physical ability is unidirectional。

Shown in Fig. 1 E, the structure of the heat pipe H of following more detailed description the present embodiment, first body 1 has an evaporation part E, an insulation A and a condensation part C, evaporation part E, insulation A and condensation part C are interconnected to define this hollow chamber 10, evaporation part E and condensation part C is respectively close to two ends 11,12 of the first body 1, insulation A, then between evaporation part E and condensation part C, is only intended for signal about the insulation A shown by Fig. 1 E and the condensation part C region contained and is not used to limit its scope。In the present embodiment, the second body 2 is positioned at the condensation part C and whole insulation A of the evaporation part E of part, part。So this non-limiting person, in other embodiments (as shown in fig. 1f), the second body 2a of heat pipe H1 is then only located at the condensation part C and this whole insulation A of part。

During practical application heat pipe H, it is arranged at the evaporation part E that one end is heat pipe H of thermal source, away from the condensation part C that one end is heat pipe H of thermal source。In radiation processes, the latent heat produced because of thermal source near the working fluid of evaporation part E is by working fluid carburation by evaporation, and the C direction, condensation part of past first body is moved after working fluid vaporization, and in the process moving to condensation part C the working fluid of re-condenses back into liquid form gradually, now evaporation part E is evaporated to higher-pressure region, condensation part C is then condensed into low-pressure area gradually, steam is driven to be moved toward condensation part C from evaporation part E via insulation A in the first body 1 by the vapor pressure differential formed in heat pipe H, and drive working fluid to be flowed toward evaporation E portion from condensation part C via insulation A in the second body 2, that is, the working fluid of condensation can push the second body 2 by vapor pressure differential, and in the second body 2 again transport flow to evaporation part E。In other words, the heat that thermal source produces is by working fluid (liquid phase) evaporation endothermic in pipe vaporize (vapour phase), produced steam is driven the condensation part C flowing to heat pipe H by vapor pressure differential, and steam discharges latent heat in condensation part C and namely condenses the working fluid reverting back to liquid phase。So constantly circulation is to dispel the heat by the heat pipe H of the present embodiment。

Holding above-mentioned, the heat pipe H of the present embodiment can improve liquid vapour cycle and pass ability with the heat promoting heat pipe H, owing to heat pipe H drives working fluid return with vapour pressure, relatively nonreactive Gravity Problem, can bear the change of pyrotoxin excursion。More preferably, the heat pipe H of the present embodiment, due to simple in construction, therefore can improve quality and yield that heat pipe makes, reduce cost。

The partial appearance schematic diagram of the heat pipe of Fig. 2 A and Fig. 2 B respectively other embodiments of the invention。What need to first illustrate is, the heat pipe H1 of the structure of heat pipe H2, H3 and previous embodiment is substantially the same, only heat pipe H2, H3 also includes one second capillary structure 13b, 13c, and second capillary structure 13b, 13c be arranged at hollow chamber 10b, 10c end 11 near heat pipe H2, H3, in other words, the first capillary structure 21b, 21c and the second capillary structure 13b, 13c are all disposed in proximity to the end 11 of heat pipe H2, H3。Wherein, the second capillary structure 13b of heat pipe H2 is fiber, it is advantageous to for weaving mesh, and the second capillary structure 13c of heat pipe H3 is fine fibre。

Shown in Fig. 2 A, in the heat pipe H2 of the present embodiment, the second capillary structure 13b and the first body 1b inner tubal wall 14b and/or the second body 2b outer tube wall 24b part contact that are positioned at evaporation part E。The first capillary structure 21b in second body 2b may extend to outside the second body 2b。Wherein, at least part of first capillary structure 21b is connected with the second capillary structure 13b extended to outside the second body 2b, or have part overlapped, so that the fluid in the second body 2b is transmitted to the second body 2b, reach to intercept opposing steam flow simultaneously and enter the effect in the second body 2b。

During practical application, relation between first capillary structure and the second capillary structure and unrestricted as above, the at least part of first capillary structure 21c and the second capillary structure 13c extended to outside the second body 2c of such as heat pipe H3 contacts in the way of winding, so that laser propagation effect therebetween is more preferably。

Additionally, as shown in Figure 2 C, the first capillary structure 21d of heat pipe H4 extends to outside the second body 2d, to form the second capillary structure 13d between the first body 1d inner tubal wall 14d and the second body 2d outer tube wall 24d。In other words, in the present embodiment, extend the second capillary structure 13d that namely the first capillary structure 21d outside the second body 2d is heat pipe H4 simultaneously, thus having the advantage of Simplified flowsheet。

Should be noted that, the generation type restricted person of all non-invention about first capillary structure 21b, 21c, 21d in heat pipe H3, H4, H5 and second capillary structure 13b, 13c, 13d, it can be formed from metal sintering powder, fiber or braiding mesh, or its combination, and first can be formed from identical or different form between capillary structure 21b, 21c, 21d and second capillary structure 13b, 13c, 13d, the restricted person of this non-invention。

Fig. 3 A is the partial appearance schematic diagram of the heat pipe of other embodiments of the invention, and Fig. 3 B is the schematic diagram that the heat pipe shown in Fig. 3 A carries out flattening process, and Fig. 3 C is the schematic cross-section after flattening processes of the heat pipe shown in Fig. 3 A。In the present embodiment, the heat pipe H2 of the structure of heat pipe H5 and previous embodiment is substantially the same, only the first body 1e of heat pipe H5 contacts the outer tube wall 24e of the second body 2e in the inner tubal wall 14e of its two end 11e, 12e after flattening processes, when after heat pipe H5 flattening, be positioned at the second capillary structure 13e outside the second body 2e can all or part of cladding the first capillary structure 21e of extending outside the second body 2e, effectively to promote the hot transfer efficiency of heat pipe H5。

Fig. 4 A is the partial appearance schematic diagram of the heat pipe of another embodiment of the present invention, Fig. 4 B is the schematic cross-section of the C-C section line of the heat pipe shown in Fig. 4 A, please also refer to shown in Fig. 4 A and Fig. 4 B, compared to foregoing embodiments, heat pipe H6 has the first bigger body 1f, in other words, the first body 1f has bigger hollow chamber 10f。Wherein, heat pipe H6 has multiple second body 2f, and the second body 2f is arranged adjacent in the first body 1f。By how, the setting of several second body 2f, can form the flat hot pipe H6 that area is bigger。Owing to the heat pipe H6 of the present embodiment processes through flattening equally, the inner surface of the first body 1f is resisted against the outer tube wall of the second body 2f, enables the second body 2f as the supporting construction of heat pipe H6, it is prevented that heat pipe H6 depressed deformation。

In sum, the heat pipe of the present invention is owing to having one first body and arranging one second body in the inner, and one first capillary structure is set by one end of evaporation part close in the second body, to stop opposing steam flow to enter in the second body, and workflow physical ability is made to carry in the second body with one direction。Owing to this structure is upper relatively simple in making, therefore can improve quality and yield that heat pipe makes, and cost can be reduced。Additionally, the heat pipe of the present invention improves the efficiency of inside heat pipe liquid vapour cycle with the structure of inner and outer pipes form, and then the heat promoting heat pipe passes ability, is particularly suitable for being beneficial to the thermal shock of opposing transient state, it is possible to effectively solve high heat and high heat-flux requirement。

The foregoing is only illustrative, but not be restricted person。Any spirit without departing from the present invention and category, and to its equivalent modifications carried out or change, be intended to be limited solely by appended claims。

Claims

1. a heat pipe, including:

One first body, has an evaporation part, an insulation and a condensation part, and this evaporation part, this insulation and this condensation part are interconnected to define a hollow chamber, and this first body two ends on the axial direction of this heat pipe are all closing；And

At least one second body, is arranged at this hollow chamber, and this second body has an accommodation space and one first capillary structure, and this first capillary structure is arranged at this accommodation space one end near this evaporation part；

Wherein, this hollow chamber of this first body is steam channel, and this second body is process fluid passages, this heat pipe drives steam to be moved from this evaporation part toward this condensation part in this first body with vapor pressure differential, and drives working fluid to be flowed from this condensation part toward this evaporation part in this second body。

2. heat pipe according to claim 1, wherein this second body is positioned at this condensation part and this whole insulation of this evaporation part of part, part。

3. heat pipe according to claim 1, wherein this second body is only located at this condensation part of part and this whole insulation。

4. heat pipe according to claim 1, wherein this first body is uiform section in its cross section in the radial direction。

5. heat pipe according to claim 1, wherein this first capillary structure is formed from metal sintering powder, fiber or braiding mesh, or its combination。

6. heat pipe according to claim 1, wherein this first body also includes one second capillary structure, and this second capillary structure is arranged at this hollow chamber near this evaporation part。

7. heat pipe according to claim 6, wherein this second capillary structure is formed from metal sintering powder, fiber or braiding mesh, or its combination。

8. heat pipe according to claim 6, wherein this first capillary structure is connected with this second capillary structure, or has part overlapped。

9. heat pipe according to claim 6, wherein this second capillary structure contacts with this first body inner tubal wall being positioned at this evaporation part and/or this second body outer tube wall portion。

10. heat pipe according to claim 6, wherein this first capillary structure in this second body may extend to outside this second body, when, after this heat pipe flattening, being positioned at this second capillary structure outside this second body all or part of cladding can extend the first capillary structure outside this second body。

11. heat pipe according to claim 1, wherein it is covered with this second body near this first capillary structure of this evaporation part。

12. heat pipe according to claim 1, wherein the inner tubal wall of this first body contacts the outer tube wall of this second body。

13. heat pipe according to claim 1, also including multiple second body, the plurality of second body is arranged adjacent in this first body。