CN1455452A

CN1455452A - Zero cutting-angle curved-plate micro-heat tube

Info

Publication number: CN1455452A
Application number: CN 03114341
Authority: CN
Inventors: 徐进良; 周肇秋
Original assignee: Guangzhou Institute of Energy Conversion of CAS
Current assignee: Guangzhou Institute of Energy Conversion of CAS
Priority date: 2003-04-29
Filing date: 2003-04-29
Publication date: 2003-11-12

Abstract

As integrity of transistors rises, heat-flow density is also raised. The technique for spreading heat of electronic components is becomming a bottleneck of information industry development. Minitype heat tube can be utilized for electronic components with high heat-flow density and small heating area. Flat minitype heat tubes are in research stage in some developing countries. Test results indicate that flat minitype heat tubes show evident advantage in cooling cips with high heat-flow density; but the disavantage is that electric spark machining is needed, thus, its cost is high. The heat tube prepared by the invention has the excellent performances and low manufacturing cost.

Description

The zero plate micro heat pipe of corner cut curved surface

Technical field

The invention belongs to heat diffuser, mainly is a kind of plate micro heat pipe of zero corner cut curved surface of complete novelty, can be used as the heat diffuser of the electronic component that the little but density of heat flow rate of heating area comparatively concentrates.

Background technology

According to the size of electronic devices and components power density, the method for multiple removal electronic component used heat is arranged.Big for caloric value, but the little element of area density of heat flow rate can solve by the optimal design of heat sink (Heat Sink), adds fan etc. as traditional fin.And for the very big element of area density of heat flow rate, except be provided with heat sink, importantly at electronic component and the final heat diffuser that function admirable is set between heat sink.The effect of heat diffuser is the area with the caloric value high concentration, and heat load spreads apart under the low temperature difference, goes by heat sink finally being discharged in the environment then.

The simplest heat diffuser is to install one additional heat-generating electronic elements and heat sink to have a same area with heat sink, but metal derby much larger than the heater element area, as copper billet or aluminium block, heat is delivered to metal derby by heater element, and the rule according to three-dimensional heat conduction spreads apart in metal derby, and finally is delivered to heat sinkly, and its advantage is a simplicity of design, but performance is not ideal enough, has shortcomings such as the interior temperature distributing disproportionation of metal derby.

In recent years, along with information industry develops rapidly, transistorized integrated level improves greatly, and the density of heat flow rate of unit are also improves thereupon, thereby the electronic element radiating technology becomes the bottleneck of the information industry development.The external upsurge that forms development new electronic component cooler in recent years.From nineteen ninety, begin to develop micro heat pipe abroad, and about nineteen ninety-five, come into operation, single micro heat pipe (external diameter Φ 3mm, length is 100mm, 150mm series) has cooperated the heat sink cooling that is applied to the laptop computer cpu chip, but heat delivered ability 4-6W only.Plate micro heat pipe still is in the development stage at present in developed capitalist countries such as the U.S., Japan, and The tested results shows that plate micro heat pipe is demonstrating remarkable advantages aspect the heat radiation sam that is used for the high heat flux chip.But its shortcoming is to adopt special processing methods such as electric spark, thereby cost is higher.The common feature of plate micro heat pipe is to adopt the bull parallel microchannels, and the geometry of its passage is triangle or rectangle, and the cross section geometric angle is 60 ° or 90 °.

The objective of the invention is to propose a kind of function admirable, but the lower plate micro heat pipe of zero corner cut curved surface of processing cost.

Summary of the invention

The zero plate micro heat pipe of corner cut curved surface provided by the present invention, need not pump as power source, be mechanical rotating part, form by the filament (5) that lays winding between two metal parallel flats (3,4) that inject enclosing liquids and the sealing of soldering and sealing all around, two flat boards and vacuum port (1) and fluid injection port (2).

Purpose of the present invention is achieved by the following technical programs: closely lay filament side by side between two parallel plates (3,4), filament is wound in cylindrical, can make for any wire such as copper wire, iron wire, aluminium wire, wire diameter can be at 0.01mm-10mm.To be laid with soldering and sealing around the wiry two dull and stereotyped edges, and reserve vacuum port (1) and fluid injection port (2), just form the zero plate micro heat pipe of corner cut curved surface.

Said flat board (3,4) is copper coin, aluminium sheet, corrosion resistant plate or other any metallic plate.It has the function of package metals silk and liquid.When work, flat board absorbs local high heat flux, and heat is spread apart along whole plate level.Said vacuum port (1) is a Red-copper Capillary Tube, links with vacuum equipment in when encapsulation, can remove the air in the plate micro heat pipe, is methyl alcohol, ethanol, water or electronics cooling agent FC-72 from the enclosing liquid of fluid injection port (2) injection.

Said fluid injection port (2), its geometry and vacuum port (1) are similar, have function from liquid to plate micro heat pipe that inject.

The structure of the zero plate micro heat pipe of corner cut curved surface of the present invention in conjunction with the accompanying drawings is explained as follows: Fig. 1 is the outline drawing of the zero plate micro heat pipe of corner cut curved surface, and Fig. 2 is its cross sectional shape figure.Cylindrical metal silk and form up and down two of symmetry row's curved surface triangles fully up and down between two parallel plates.A point and C point are the point of contact between filament and flat board, and its corner cut is 0 °.Because filament (5) twines and to become cylindrically, thereby AB face and BC face are 1/4 face of cylinder.The B point is the point of contact, and its corner cut is 0 °.By above design feature as can be seen, all form zero corner cut at A, B, 3 of C, zero corner cut curved surface micro heat pipe hence obtains one's name.At A, B, three sharp corners of C, liquid is highly susceptible to storage, thereby highly beneficial for the evaporate to dryness that prevents local high heat flux district liquid.The performance that can estimate zero corner cut curved surface micro heat pipe is better than the external at present employing triangle of developing or the micro heat pipe of rectangle.The plate micro heat pipe of zero corner cut curved surface adopts filament to be laid in and makes between parallel flat, thereby its processing cost is significantly less than the plate micro heat pipe of developing at present abroad.

The operation principle and the process of the zero plate micro heat pipe of corner cut curved surface of the present invention are as follows: plate micro heat pipe vacuum pumping and inject partially liq after because capillary effect, liquid storage is in the sharp corner in cross section, in be formed centrally the vapour core.When a plane of plate micro heat pipe was subjected to localized heating, evaporation process resulted from the liquid-vaqor interface place rapidly, thereby heat is delivered to rapidly in the adjacent curved surface triangular duct.Because heating only occurs in small size thermal source plane, other regional temperature is relatively low, thereby in the non-thermal treatment zone of the flat raft of triangular duct correspondence, the liquid-vaqor interface place produces condensation process, and condensate liquid is back to the thermal treatment zone under capillary effect.By above process as can be seen, the wedge angle portion of microchannel plays crucial effects to the work of micro heat pipe, and it is for preventing that the evaporate to dryness phenomenon of high heat flux under being heated from playing key effect.

The zero plate micro heat pipe of corner cut curved surface need not pump as power source, i.e. so mechanical rotating part is noiselessness, also Maintenance free during work.The work coolant is a liquid: as methyl alcohol, ethanol, water or electronics cooling agent FC-72, and is sealed in the micro heat pipe, do not have and leak, and safe and reliable to operation.Accompanying drawing:

Fig. 1 is the outline drawing of the zero plate micro heat pipe of corner cut curved surface;

Fig. 2 is the cross sectional shape figure of zero corner cut curved surface triangular duct;

Fig. 3 and Fig. 4 have provided the application example of the two kinds zero plate micro heat pipes of corner cut curved surface;

Description of drawings:

1---vacuum port;

2---the fluid injection port;

3---upper flat plate;

4---dull and stereotyped down;

5---wire;

6---base;

7---the CPV chip;

8---the electronic heating chip;

9---heat sink fin;

A, B, C---point of contact;

Below in conjunction with drawings and Examples details of the present invention is described in further detail:

Embodiment 1

Among Fig. 3, go up the plate micro heat pipe of placement at the cpu chip (7) of notebook laptop computer, the heat that CPU produces when operation is delivered to plate micro heat pipe rapidly, is delivered to by plate micro heat pipe on base (6) metal of notebook computer, thereby finally is discharged in the environment.

Embodiment 2

Among Fig. 4, the zero plate micro heat pipe of corner cut curved surface is used as heat diffuser, small size high heat flux thermal source electronic heating chip (8) is positioned over the center of plate micro heat pipe.Under the effect of plate micro heat pipe, the density of heat flow rate of high concentration spreads apart on plate micro heat pipe rapidly under the low temperature difference, thereby obtains a lower density of heat flow rate at the another side of plate micro heat pipe.According to the size of received heat, whether decision adopts fan, and heat finally is discharged in the atmospheric environment by heat sink fin (9) and goes.

Claims

1, a kind of zero plate micro heat pipe of corner cut curved surface, it is characterized in that mechanical rotating part, form by the filament (5) that lays winding between two metal parallel flats (3,4) that inject enclosing liquids and the sealing of soldering and sealing all around, two flat boards and vacuum port (1) and fluid injection port (2).

2, according to the plate micro heat pipe of zero corner cut curved surface described in the claim 1, it is characterized in that described filament (5), between two flat boards, closely arrange and be wound in cylindrical that diameter wiry is copper wire, iron wire or the aluminium wire of 0.01mm-10mm.

3, according to the plate micro heat pipe of zero corner cut curved surface described in the claim 1, it is characterized in that described vacuum port (1), be Red-copper Capillary Tube, when encapsulation, be connected with vacuum equipment.

4, according to the plate micro heat pipe of zero corner cut curved surface described in the claim 1, it is characterized in that described fluid injection port (2), for injecting the Red-copper Capillary Tube of liquid to plate micro heat pipe.

5, according to the plate micro heat pipe of zero corner cut curved surface described in claim 1 or 2, it is characterized in that the described columniform wire (5) that is wound in, and form between two parallel plates up and down up and down and two of symmetry arrange the curved surface triangles fully, point of contact between filament and flat board (A, B, C), its corner cut is 0 °.

6,, it is characterized in that described flat board is copper coin, aluminium sheet or corrosion resistant plate according to the plate micro heat pipe of zero corner cut curved surface described in the claim 1.

7,, it is characterized in that described enclosing liquid is methyl alcohol, ethanol, water or electronics cooling agent FC-72 according to the plate micro heat pipe of zero corner cut curved surface described in the claim 1.