CN100343785C

CN100343785C - Pulsating type heat transmission device

Info

Publication number: CN100343785C
Application number: CNB2005100327955A
Authority: CN
Inventors: 朱习剑; 黄清白
Original assignee: Fuzhun Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Fuzhun Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2005-01-10
Filing date: 2005-01-10
Publication date: 2007-10-17
Anticipated expiration: 2025-01-10
Also published as: CN1804756A

Abstract

The present invention relates to a pulsating type heat transmission device, and a flow channel with a capillary function is arranged in the device. Working fluid in sectional and segmental dispersion is arranged in the flow channel, wherein a part of the flow channel is formed by the inner hole of a plurality of capillaries. A heat absorption unit and a heat radiation unit are arranged on an extending path of the pulsating type heat transmission device, and a capillary channel which can form the other part of the flow channel is arranged in the middle part of at least one of the heat absorption unit and the heat radiation unit. The capillary body is connected with at least one of the heat absorption unit and the heat radiation unit and is communicated with the capillary channel. The present invention can reduce the volume of the pulsating type heat transmission device and can increase the pulsating strength of the working fluid.

Description

Pulsating type heat transmission device

[technical field]

The present invention relates to heat transfer apparatus, refer to a kind of pulsating type heat transmission device that is used for electronic element radiating especially.

[background technology]

Along with the electronic component travelling speed is more and more faster, thermal value is also increasing.The tradition fan-cooled radiator has seemed and can't be competent at the radiating requirements of high-speed electronic component.Based on this background, heat-pipe radiating apparatus just is used widely day by day efficiently.

Conventional heat pipe is made up of metal tube, capillaries fabricated thing and working fluid basically.The capillaries fabricated thing is hollow form, is attached to inner wall of metal tube and forms hollow channel.Working fluid as alcohol, methyl alcohol or water etc., is filled in metal tube inside.Heat pipe one end is an evaporation ends, and the other end is a condensation end.The principle of work of conventional heat pipe simply is described below: when this evaporation ends was heated, the working fluid heat absorption flashed to steam, and steam is condensed into liquid via the condensation end that hollow channel flow to heat pipe, and heat of condensation then drains into the external world and is pulled away.Condensed fluid utilizes its capillary action via the capillaries fabricated thing, returns to evaporation ends, continues to be heated, to evaporate, and finishes a continuous and stable heat conduction circulation.

The major defect of conventional heat pipe comprises the following aspects: (1) conventional heat pipe is in manufacture process, need experience to flatten and the bending and forming operation, this makes the capillaries fabricated thing in the heat pipe easily be damaged, also make the interior gas channel cross-sectional area of heat pipe become uncontrollable, size is uneven, increase the air current flow resistance, thereby have a strong impact on the performance of heat pipe; (2) the capillaries fabricated thing is made with QC and is difficult for the cost height; (3) the heat transfer distance is subjected to the restriction of capillaries fabricated thing.

For improving the disappearance of conventional heat pipe, a kind of new-type heat pipe framework is proposed by correlative study person, wherein, Japanese Akachi is in its United States Patent (USP) the 4th, 921,041 and 5, disclose the correlation technique that this heat pipe is arranged in 219, No. 020, its structure and principle of work are different from conventional heat pipe.As Figure 10, the pipeline of the new-type heat pipe of this kind is the multiloop shape, and the pipeline two ends are connected.Pipeline adopts capillary design, so does not need to be provided with any capillaries fabricated thing in the pipe.One side of multiloop is provided with evaporation element 1, and another side is provided with condensing unit 2, and the position of evaporation element 1 and condensing unit 2 is unrestricted.Be filled with the working fluid of volume in the pipe less than the pipe internal volume.Working fluid forms alternatively distributed fluid column 3 and gas column 4 owing to being subjected to capillary action to be the segment-like random scatter in loop.

When evaporation element 1 was heated, fluid column 3 heat absorption evaporation formed steams, and pressure rises and pushes fluid column 3 and gas column 4 flows towards a direction, but steam is condensed into liquid when walking to condensing unit 2, volume greatly reduces, and forms low pressure resistance, prevents that it from continuing to flow forward; Because evaporation element 1 and condensing unit 2 communicate, the fluid column 3 of working fluid and gas column 4 form pulsation (Pulsating) or vibration (Oscillating) phenomenon under this evaporating pressure and the interaction of condensation resistance, reach the heat transfer purpose.Therefore, this kind heat pipe promptly be called as " pulsation type heat pipe " (Pulsating Heat Pipe, PHP) or " oscillating heat pipe " (Oscillating Heat Pipe).

In above-mentioned pulsation type heat pipe, fluid is the pressure differential driving by the volume change generation of fluid self.The very important condition that its pulsation mechanism need satisfy is that evaporation element and condensing unit exist certain thermograde, and this thermograde is excitation and keeps the condition that pressure fluctuation produces.This just means that evaporation element and cooling unit need enough length, this Unit two heat are transmitted fast, so that make evaporation element and cooling unit keep certain thermograde.Along with the length increase of evaporation element and cooling unit, the pulsation type heat pipe volume also increases.This promptly is that present industry rarely has and pulsation type heat pipe is applied to volume sees one of the major reason in little computer heat radiation field day by day, thereby the volume that how to reduce pulsation type heat pipe promptly becomes industry and is badly in need of the problem that will solve.

And, the such computer system of PC or notebook computer has central processing unit (CPU) and video card a plurality of thermals source such as (VGA) usually, if use conventional heat pipe or existing pulsation type heat pipe technology, then can't design radiating module arbitrarily by its space of giving, therefore, certain limitation is arranged.

In addition, in above-mentioned pulsation type heat pipe, the pressure of fluid own changes more greatly, and then pulsation phenomenon Shaoxing opera is strong, and corresponding underground heat transfer efficiency is just high more.Therefore, how to improve another research direction that this fluctuation intensity promptly becomes industry.

[summary of the invention]

Technical matters to be solved by this invention provides the less pulsating type heat transmission device of a kind of volume.

Thereby further technical matters to be solved by this invention provides a kind of pulsating type heat transmission device that pulse strength improves efficiency of thermal transfer that improves.

For solving the problems of the technologies described above, pulsating type heat transmission device of the present invention, be provided with one in it and have capillary runner, contain in the described runner and be the working fluid that section type scatters, wherein the part runner is that endoporus by many capillaries forms, this pulsating type heat transmission device is provided with a heat absorbing units and a heat-sink unit on the extension path of described runner, at least one of them inside of heat absorbing units and heat-sink unit is provided with the capillary grooves that constitutes another part runner, described body capillaceous and described heat absorbing units at least and one of them connection of heat-sink unit and communicate with described capillary grooves, described capillary grooves has bifurcation structure.

Compare existing body design, the block-like design of endothermic section of the present invention and radiating part makes endothermic section and radiating part volume reduce, and improves the hot transfer efficiency of working fluid; In addition, the bifurcation structure of capillary grooves of the present invention can strengthen runner internal pressure fluctuation intensity, thereby the degree of pulsatility of aggravation working fluid improves hot transfer efficiency.

[description of drawings]

Fig. 1 is the stereographic map of pulsating type heat transmission device of the present invention.

Fig. 2 is the three-dimensional exploded view of Fig. 1.

Fig. 3 is the stereo amplification figure of Fig. 2 centre circle III part.

Fig. 4 is the stereo amplification figure of Fig. 2 centre circle IV part.

Fig. 5 is the sectional view along Fig. 1 center line VI-VI.

Fig. 6 is the runner synoptic diagram of pulsating type heat transmission device of the present invention.

Fig. 7 to Fig. 9 is the part runner synoptic diagram of other shape of pulsating type heat transmission device of the present invention.

Figure 10 is the synoptic diagram of existing pulsation type heat pipe.

[embodiment]

With reference to the accompanying drawings, the invention will be further described in conjunction with the embodiments.

Fig. 1 is the pulsating type heat transmission device 10 of the present invention schematic perspective view of (being called for short " heat transfer apparatus " down).According to this embodiment, this heat transfer apparatus 10 comprises 100,200,300, one radiating parts 400 in three endothermic sections, and the many capillaries 500 that connect with these endothermic sections 100,200,300 and radiating part 400.It is block that these endothermic sections 100,200,300 and radiating part 400 are, its inside is provided with capillary grooves (describing in detail in the back), these capillary grooves are communicated with formation one bending extension and have capillary runner with kapillary 500, be filled with the gas column and the fluid column (Fig. 6) of alternately arranging in this runner.Described kapillary 500 can be soft pipe, also can be metal tube such as copper pipe.

Described endothermic section 100,200,300 constitutes the heat absorbing units of this heat transfer apparatus 10, and this radiating part 400 constitutes the heat-sink unit of this heat transfer apparatus 10.The bottom of described endothermic section 100,200,300 is smooth heat-exchange surfaces, contact with heater element (figure does not show) separately, during work, the Btu utilization gas column that described endothermic section 100,200,300 absorbs and the pulsation circulating transfer of fluid column are distributed in the surrounding air then to radiating part 400.Be to strengthen radiating effect, radiating part 400 also can utilize the auxiliary radiating device of its smooth heat-exchange surface in conjunction with other form, as heat abstractors such as air-cooled, liquid-cooled or semiconductor coolings.

To introduce in detail at endothermic section 100,200,300 and radiating part 400 below.

See also Fig. 2, each endothermic section 100,200,300 and radiating part 400 are to be made by the good material of heat conductivity, as metals such as copper, aluminium.Described endothermic section 100,200,300 and radiating part 400 are all by base and loam cake be combined into, wherein, endothermic section 100 comprises base 110 and loam cake 120, endothermic section 200 comprises base 210 and loam cake 220, endothermic section 300 comprises base 310 and loam cake 320, and radiating part 400 comprises base 410 and loam cake 420.

The apparent surface of described base 110,210,310 and corresponding loam cake 120,220,320 is provided with identical groove (only the groove of base as seen), when base 110,210,310 and corresponding loam cake 120,220,320 in conjunction with the time, promptly between above-mentioned base 110,210,310 and loam cake 120,220,320, form inner capillary grooves, this capillary grooves has at least two outlets, is communicated with external capillary 500.

Base 110 is provided with the mutual disconnected groove 130,140 in two places.Wherein, groove 130 has the

depression

132 and 134 that is interconnected, and depression 134 is elongated shape and crooked the extension, is positioned at the two ends at base 110 edges and is communicated with kapillary 500.Depression 132 is a width greater than the width of depression 134 at base 110 lip-deep lateral dimensions, and 132 area occupied that therefore cave in are bigger, and groove 140 has the bigger depression of an area 142 and is communicated with the elongated shape depression 144 of depression 142 and kapillary 500.

Base 210 is provided with place's groove 230, and this groove 230 is similar with groove 140 shapes of base 110, has the elongated recess 234 of the bigger depression of area 232 and connection depression 232 and kapillary 500.

Base 310 is provided with the consistent and mutual disconnected groove 330 of two place's shapes, and this groove 330 has the bigger depression of area 332 and is communicated with the elongated shape depression 334 of depression 332 and kapillary 500.

By above introduction as can be known, three endothermic sections 100,200,300 are provided with five capillary grooves that formed jointly by groove altogether, and these five raceway grooves have ten outlets, are connected with ten capillaries 500 respectively.

The base 410 of radiating part 400 and the apparent surface of loam cake 420 are provided with mutual disconnected groove 430 (only the groove of base 430 as seen) everywhere, and each groove 430 shape unanimity is roughly similar with the groove 230 of endothermic section 200.When base 410 and loam cake 420 in conjunction with the time, four inner capillary grooves of these groove 430 common formation, have eight outlets, respectively with outside ten capillaries 500 wherein eight be connected, its ways of connecting is, each capillary grooves of radiating part 400 is communicated with wherein two capillary grooves of endothermic section 100,200,300, and each capillary grooves of endothermic section 100,200,300 is communicated with the runner that the continuous bending of formation is so promptly extended with wherein two capillary grooves of radiating part 400.

Except that above-mentioned four grooves 430, this base 410 and loam cake 420 also are provided with an elongated shape groove 440, and this groove 440 is surrounded on all grooves 430.When base 410 and loam cake 420 fastenings, the groove 440 common elongated shape capillary grooves that form, it has two outlets, is connected with other two capillaries 500.So, all capillary grooves and the kapillary 500 common runners that form the continuity bending extension of sealing.

Above-mentioned capillary grooves is that the groove combination by corresponding base and loam cake opposite face forms, and as another molding mode, also can only form groove on above-mentioned base and one of them surface of loam cake, and another surface is to be the plane.

Base and on the cap surface method of making groove have multiple, as modes such as precision die processing, etching, electrodischarge machining.

Above-mentioned endothermic section and radiating part adopt split-type design, and promptly by base and loam cake be combined into, this combination can have multiple.To be that example describes at a kind of combination with endothermic section 300 simultaneously with reference to Fig. 2 to Fig. 5 below.

Fig. 3 and Fig. 4 are the partial enlarged drawings of Fig. 2, and as can be seen from the figure, the loam cake 320 of endothermic section 300 is provided with a

circle flange

322, and 310 pairs of bases should be provided with a circle caulking groove 312 by flange 322, and the cross-sectional shape of this flange 322 is slightly larger than this caulking groove 312 cross-sectional shape.

Please refer to Fig. 5, when base 310 combined with loam cake 320, this flange 322 was pressed in this caulking groove 312, and distortion in this caulking groove 312, thereby base 310 and loam cake 320 are combined into one via similar friction tight mode.Except that above-mentioned flange was joined the combination of caulking groove, the present invention also can adopt modes such as welding, binder cohere, sintering that above-mentioned base and loam cake are combined.

Yet need explanation, above-mentioned is not sole mode via base and loam cake in conjunction with endothermic section or the radiating part that formation has inner capillary grooves.Described endothermic section or radiating part also can be complete integrative-structures, and it can utilize casting technique to make.

Seeing also Fig. 6, is the distribution plan of working fluid in heat transfer apparatus 10 as shown in Figure 2.Because capillary action, working fluid forms the gas column 600 and the fluid column 700 of stochastic distribution in runner.By the pulsation circulation of gas column 600 and fluid column 700, the heat that endothermic section 100,200,300 absorbs heater element is passed to radiating part 400 continuously and is distributed.Because it is block that endothermic section 100,200,300 and radiating part 400 are, it can closely contact with heater element and auxiliary radiating device, can reduce interface resistance.

In the capillary grooves of endothermic section 100,200,300 and radiating part 400 inside, the bigger depression of area 132,144,232,332 positions are formed with a plurality of cavitys, and form bifurcation structure at elongated shape capillary groove 134,334 two ends, make working fluid be divided into two stocks and do not flow to elongated shape capillary groove and aforementioned cavity in this end positions.Owing to adopt this kind design, fluid column 700 bumps after running into described bifurcated/cavity and produce to mix, can strengthen working fluid and runner inner wall between heat-transfer effect, strengthen runner internal pressure fluctuation intensity simultaneously, aggravation fluid pulsation degree, heat transfer efficiency is improved.And for gas column 600, gas column 600 such as merges, breaks, collides, gathers at behavior after running into described bifurcated/cavity, also can strengthen the heat-transfer effect between working fluid and the runner inner wall, strengthens runner internal pressure fluctuation intensity simultaneously.

In addition, in the endothermic section 100,200,300 and radiating part 400 inside the contact area that cavity and bifurcation structure have also increased working fluid and endothermic section and radiating part inwall is set, improve hot transfer efficiency, and the existing body design of block-like design has the effect that reduces endothermic section and radiating part volume.

In the present embodiment, because that the endothermic section has is a plurality of, each endothermic section can corresponding heater element, therefore can the heater element of a plurality of diverse locations be dispelled the heat.

Except the inside capillary grooves shape of several endothermic sections 100,200,300 of above-mentioned present embodiment and radiating part 400, this creation also can be adopted the capillary grooves of other shape, as Fig. 7 to netted capillary grooves shown in Figure 9.Need explanation, these are graphic to be not the exhaustive introduction, and the present invention is not limited only to the shape shown in the figure.For clear channel region and the non-channel region of showing, also gas column and fluid column are drawn in the drawings.

As Fig. 7, two elongated shape capillary grooves that are interconnected 71,72 in the endothermic section or radiating part inside arrange in mode arranged side by side, be communicated with external capillary 500 then and constitute continuous runner, wherein these two capillary grooves, 71,72 two ends form bifurcation structure, as previously mentioned, this bifurcation structure can improve the fluctuation intensity of working fluid.

As Fig. 8, be similar with Fig. 7, difference is that the runner of this Fig. 8 comprises three elongated shape capillary grooves that are interconnected 81,82,83, these three capillary grooves, 81,82,83 two ends form bifurcation structure.Be appreciated that endothermic section or radiating part inside can also be provided with the capillary grooves more than three.

As shown in Figure 9, be in the endothermic section or the inner netted

capillary grooves

91,92 in two places that forms of radiating part, this two places

capillary grooves

91,92 is communicated with.This netted

capillary grooves

91,92 can adopt any form of the aforementioned the 7th and the 8th figure, so these

capillary grooves

91,92 form the many places bifurcation structure.

In the above-mentioned embodiment, the heat absorbing units of this creation heat transfer apparatus 10 has three endothermic sections 100,200,300, and heat-sink unit has a radiating part 400, is appreciated that, perhaps a plurality of radiating parts can be set according to actual needs greater or less than three endothermic sections.The raceway groove of aforesaid any shape can be adopted in each endothermic section and radiating part inside, also can adopt the combination of the raceway groove of multiple shape.

In addition, in the above-mentioned embodiment, heat absorbing units and heat-sink unit all are the block elements that inside is provided with capillary grooves, it not only can reduce the volume of heat absorbing units and heat-sink unit, can also utilize the smooth heat-exchange surface of block elements to do closely to contact, to reduce interface resistance with thermal source or auxiliary radiating device.In actual the use, also can be only one of them is designed to block elements with heat absorbing units and heat-sink unit.

Therefore and in the above-described embodiment, the endothermic section is all made by metal material, because the heat absorption function is mainly finished by base, base is made by metal material, and loam cake is made by the material of other relative low price, as plastics etc.

Claims

1. pulsating type heat transmission device, be provided with one in it and have capillary runner, contain in the described runner and be the working fluid that section type scatters, wherein the part runner is that endoporus by many capillaries forms, this pulsating type heat transmission device is provided with a heat absorbing units and a heat-sink unit on the extension path of described runner, it is characterized in that: one of them inside of heat absorbing units and heat-sink unit is provided with the capillary grooves that constitutes another part runner at least, described body capillaceous and described heat absorbing units at least and one of them connection of heat-sink unit and communicate with described capillary grooves, and described capillary grooves has bifurcation structure.

2. pulsating type heat transmission device as claimed in claim 1 is characterized in that: one of them has a smooth heat-exchange surface described heat absorbing units at least and heat-sink unit.

3. pulsating type heat transmission device as claimed in claim 1 is characterized in that: one of them comprises at least one block elements described heat absorbing units at least and heat-sink unit, and described capillary grooves is to be formed by described block elements inwall.

4. pulsating type heat transmission device as claimed in claim 3 is characterized in that: described block elements is integral structure.

5. pulsating type heat transmission device as claimed in claim 3 is characterized in that: described block elements comprises a base and a loam cake that combines with this base, and described capillary grooves is formed between this base and the loam cake.

6 pulsating type heat transmission devices as claimed in claim 5 is characterized in that: one of them is provided with caulking groove this base and loam cake, and another is provided with the flange that tightly fits in this caulking groove.

7. pulsating type heat transmission device as claimed in claim 5 is characterized in that: the apparent surface of this base and loam cake all is provided with capillary groove, when base and loam cake in conjunction with the time, the capillary groove of this base and loam cake is in conjunction with forming described capillary grooves.

8. pulsating type heat transmission device as claimed in claim 5 is characterized in that: this base and loam cake only one of them surface are provided with capillary groove, and another surface is the plane.

9. as claim 1,7 or 8 described pulsating type heat transmission devices, it is characterized in that: the bifurcation structure of described capillary grooves is network-like.

10. as claim 7 or 8 described pulsating type heat transmission devices, it is characterized in that: described capillary grooves has a cavity, and on the surface of base that forms this capillary grooves or loam cake, the width of this cavity is greater than the width of the single capillary grooves that is communicated with it.

11. pulsating type heat transmission device as claimed in claim 1, it is characterized in that: described heat absorbing units comprises at least one endothermic section, described heat-sink unit comprises at least one radiating part, this inside, at least one endothermic section is provided with a plurality of capillary grooves, this at least one radiating part inside also is provided with a plurality of capillary grooves, wherein each capillary grooves of endothermic section directly is communicated with at least two capillary grooves of radiating part, and each capillary grooves of radiating part directly is communicated with at least two capillary grooves of endothermic section.

12. pulsating type heat transmission device, comprise at least one endothermic section, at least one radiating part and the many kapillaries that are connected between described at least one endothermic section and at least one radiating part, one has capillary runner extends between described at least one endothermic section, at least one radiating part and the described kapillary, contain in the described runner and be the working fluid that segment-like is scattered, it is characterized in that: at least endothermic section and radiating part one of them be block structure, described block structure inside is provided with the capillary grooves that constitutes a described runner part.

13. pulsating type heat transmission device as claimed in claim 12 is characterized in that: described block structure comprises a base and a loam cake that combines with this base, and this capillary grooves is arranged between this base and the loam cake.

14. as claim the 12 or 13 described pulsating type heat transmission devices, it is characterized in that: described capillary grooves has bifurcation structure.

15. as claim the 12 or 13 described pulsating type heat transmission devices, it is characterized in that: described capillary grooves has a cavity, at least one inner section of this block structure, the width of this cavity is greater than the width of the single capillary grooves that is communicated with it.