TWM583932U - Flexible heat pipe - Google Patents

Abstract

A flexible heat pipe comprises a closed pipe body and a working fluid in the pipe body. The pipe body comprises an evaporation section, a condensation section and a heat insulation section. The evaporation section, the condensation section and the insulation section are continuously provided with a capillary structure. The capillary structure comprises at least two layers of a wire layer, a groove layer and a copper powder sintered layer. The heat insulation segment is composed of a flexible metal bellows, and the metal bellows can be bent in any direction. The evaporation section and the condensation section are respectively composed of a metal tube. The heat insulation section is disposed in the middle of the flexible heat pipe, one end of which is connected to the evaporation section, and the other end is connected to the condensation section. The flexible heat pipe can be bent and is less prone to radial deformation, and has good heat transfer efficiency.

Description

Flexible heat pipe

The present invention relates to a heat pipe, and in particular to a flexible heat pipe that can be bent.

In the electronics industry, heat generated by heat-generating electronic components such as micro-processed wafers is increasing. In order to ensure the normal operation of the heating electronic components, these excess heat must be effectively dissipated.

The heat pipe uses the heat pipe and the working fluid to transfer heat generated by the heat-generating electronic component to the outside of the casing, and the heat on the heat pipe is forcibly dispersed by a heat dissipating device disposed outside the casing. The inside of the heat pipe is provided with a plurality of capillary or microporous structures for recirculating the working fluid. If the capillary structure or the microporous structure is broken, the working efficiency of the heat pipe may be lowered or even failed, but in the electronic product, the heat generating electrons The distribution space of the components is narrow and irregular, and the heat pipe is inevitably bent when laid out in the space, and the bending causes the capillary structure or the microporous structure to be broken, and the heat conduction efficiency of the heat pipe is lowered.

In the prior art, there are mainly two methods for reducing the efficiency of the heat pipe caused by bending, one of which adopts a complicated multi-layered protective structure and uses a plurality of materials, but the manufacturing process is complicated; and the second uses a simple capillary structure and a bent portion. Flexible materials are used, but the heat transfer efficiency of the heat pipes is not high.

In view of this, it is necessary to design and develop a flexible heat pipe that is easy to bend without radial deformation and has good heat transfer efficiency.

A flexible heat pipe comprising a pipe body closed at both ends and a working fluid accommodated in the pipe body, wherein the pipe body comprises an evaporation section, a condensation section and a heat insulation section, and the heat insulation section is connected to the evaporation section Between the condensation section. The evaporation section, the condensation section and the insulation section are each provided with a capillary structure, the capillary structure comprises a first layer and a second layer, the first layer is a groove layer or a copper powder sintered layer, and the second layer is a layer of filaments, wherein the first layer is directly attached to an inner wall of the tubular body, and the second layer is attached to the first layer. The insulating section is a flexible metal bellows that can be bent in any direction. The evaporation section and the condensation section are each a metal tube.

Further, the pipe body comprises an evaporation section, two heat insulation sections and two condensation sections, wherein two ends of the evaporation section are respectively connected with two heat insulation sections, and the two heat insulation sections respectively extend to connect two condensation sections.

Further, the wire layer is a layered structure in which a plurality of wires are woven.

Further, a gap of the copper powder sintered layer in the evaporation section is larger than a gap of the copper powder sintered layer in the condensation section.

Further, the first layer is a copper powder sintered layer.

Further, the first layer is a groove layer.

Further, the tubular body is a hollow cylindrical structure.

The flexible heat pipe provided by the present invention has the characteristics of being bendable and not easily deformed by radial deformation, and has the advantages of simple structure, easy production and good heat transfer efficiency.

The technical solution of the present invention will be clearly and completely described below with reference to the specific embodiments of FIGS. 1-8. It is apparent that the described embodiments are only a part of the implementation of the present invention, and not all of the embodiments. Based on the embodiments in the present creation, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present invention. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of the present invention, unless otherwise defined. The terminology used herein is for the purpose of describing particular embodiments, and is not intended to limit the invention.

1 is a schematic view of a first embodiment of a flexible heat pipe 10 provided by the present invention. The flexible heat pipe 10 includes a pipe body 11 which is closed at both ends and includes an evaporation section 1, an adiabatic section 2 and A condensation section 3, the insulation section 2 is connected between the evaporation section 1 and the condensation section 3. As shown in FIG. 2, the heat insulating section 2 can be made of a flexible metal bellows, the outer surface of the metal bellows is provided with an external thread 21 and the inner surface is provided with an internal thread 22, and when the bending occurs, the internal thread The outer thread 22 and the outer thread 22 may wrinkle in the thread gap to prevent the occurrence of radial deformation. The evaporation section 1 and the condensation section 3 are made of a metal material having high thermal conductivity such as silver, copper or aluminum.

As shown in FIG. 3, the flexible heat pipe 10 further includes a working fluid (not shown) filled in the pipe body 11, and a capillary structure 4 disposed on the inner wall of the pipe body 11, wherein the evaporation section 1 and the Both the adiabatic section 2 and the condensation section 3 are the capillary structure 4.

In the evaporation section 1, the working fluid is converted into steam by absorbing heat from the surface of the evaporation section 1. The steam then travels along the flexible heat pipe through the adiabatic section 2 to the condensing section 3 and releases latent heat while the steam becomes liquid. The liquid is then brought back to the evaporation section 1 by capillary action via the capillary structure 4 and the loop is repeated.

The working fluid is a liquid having a low boiling point and having a high latent heat such as water, ethanol or the like. Referring to FIG. 3, the capillary structure 4 includes a first layer 41 and a second layer 42, the first layer 41 is a wire layer 43, and the second layer 42 is a copper powder sintered layer 44, and the copper powder sintered layer 44 is disposed on an inner wall of the flexible heat pipe 10, and the wire layer 43 is disposed on the copper powder sintered layer 44. The copper powder sintered layer 44 is thermally sintered and adhered to the inner wall of the flexible heat pipe 10, and the wire layer 43 is formed on the copper powder sintered layer 44 by welding or sintering. The wire layer 43 includes a mesh structure in which copper wire, stainless steel wire, and fiber yarn are woven.

Preferably, the copper powder sintered layer 44 has a plurality of gaps therein, wherein a gap of the copper powder sintered layer 44 in the evaporation section 1 is larger than a gap of the copper powder sintered layer 44 in the condensation section 3, and the effect is small. The gap copper powder sintered layer can generate a large capillary pressure difference for facilitating efficient transfer of the liquid working fluid in the condensation section 3 to the evaporation section 1.

Preferably, the tubular body 11 is a hollow cylindrical structure.

In use, the evaporation section 1 of the flexible heat pipe 10 is thermally coupled to a heat-generating electronic component (not shown), such as a central processing unit, and the condensation section 3 is coupled to a heat sink (not shown) such as a heat sink. connection. When the heat insulating section 2 of the flexible heat pipe 10 is bent by force, the capillary structure 4 located inside the heat insulating section 2 includes the copper powder sintered layer 44 and the wire layer 43 are bent together, but the heat insulating section 2 does not Radial deformation occurs to ensure the smooth flow of the steam passage in the adiabatic section 2. The flexible heat pipe 10 can be reasonably arranged in a limited space to sufficiently carry out the heat generated by the heat-generating electronic components.

Referring to Figure 4, a radial cross-sectional view of a second embodiment of the flexible heat pipe 20 is provided by the present application. The flexible heat pipe 20 is different from the first embodiment in that the first layer 41 is a wire layer 43, the second layer 42 is a groove layer 45, and the groove layer 45 is disposed in the heat insulating section. Above the inner wall of the second layer, the wire layer 43 is disposed on the groove layer 45. The groove layer 45 is a gear-like stripe structure, and the wire layer 43 is attached to the groove layer 45 by welding or sintering. Similarly, the capillary structure 4 can be deformed as the flexible heat pipe is bent, but the curved portion does not undergo radial deformation.

Referring to FIG. 5, a schematic view of a third embodiment of the flexible heat pipe 30 is shown. The flexible heat pipe 30 is different from the first embodiment in that the capillary structure 4 includes a first layer 41 and a second layer 42, the first layer 41 is a wire layer 43a, and the second layer 42 is a wire. a layer 43b; the wire layer 43a is directly attached to the inner wall of the flexible heat pipe 30 by welding or sintering, and the wire layer 43b is attached to the wire layer 43a by welding or sintering. . Referring to FIG. 7, the wire layer 43b includes a braiding vessel 46 having an outer diameter smaller than an inner diameter of the flexible heat pipe 30. The braiding tube 46 is formed by a plurality of strands 47 vertically overlapping each other, and the strand 47 includes a plurality of lines of disturbing fine lines 48. Referring to FIG. 8, the second strand layer 43b is composed of a plurality of roots. The mutually fragile thin wires 48 are prepared; the disturbing thin wires include materials having good thermal conductivity such as thin copper wires, stainless steel wires and fiber filaments. During the bending process, the capillary structure 4 is less susceptible to radial deformation.

Please refer to FIG. 6, which is a schematic view of a fourth embodiment of the flexible heat pipe 40 of the present invention. The flexible heat pipe 40 is different from the first embodiment in that the flexible heat pipe 40 includes an evaporation section 1, two heat insulation sections 2, and two condensation sections 3, wherein the two ends of the evaporation section 1 are respectively connected to two. The heat insulating section 2, the two heat insulating sections 2 respectively extend to connect the two condensation sections 3, wherein the capillary structure 4 of the flexible heat pipe 40 can be any one of the first embodiment, the second embodiment or the third embodiment .

In use, the evaporating section 1 of the flexible heat pipe 40 is thermally coupled to a heat-generating electronic component (not shown), such as a central processing unit, and the two condensation sections 3 are coupled to a heat sink (not shown), such as heat sinking. Hot connection. The flexible heat pipe 40 can be bent at two heat insulating sections 2, and when the two heat insulating sections 2 of the flexible heat pipe 40 are bent by force, the capillary structure 4 located inside the heat insulating section 2 includes the copper powder sintered layer. 44 and the wire layer 43 are bent together, but the heat insulating section does not undergo radial deformation, thereby ensuring the smooth passage of the steam passage in the heat insulating section. Compared with the first embodiment, this embodiment has a more efficient heat dissipation effect.

The flexible heat pipe provided by the embodiment has the characteristics of being bendable and less prone to radial deformation, and has the advantages of simple structure, easy production and good heat transfer efficiency.

In addition, those skilled in the art should understand that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention, as long as it is within the spirit of the present invention, the above embodiments are made. Appropriate changes and changes are within the scope of this creation.

10,20,30,40‧‧‧ flexible heat pipe

11‧‧‧Body

1‧‧‧Evaporation section

2‧‧‧Adiabatic section

21‧‧‧ external thread

22‧‧‧ internal thread

3‧‧‧Condensation section

4‧‧‧Capillary structure

41‧‧‧ first floor

42‧‧‧ second floor

43,43a, 43b‧‧‧ silk layer

44‧‧‧Sintered layer of copper powder

45‧‧‧ Groove layer

46‧‧‧Making the vessel

47‧‧‧ strand stocks

48‧‧‧Surveying thin lines

FIG. 1 is a schematic view of a flexible heat pipe according to a first embodiment of the present invention.

2 is a schematic view of a heat insulating section of the flexible heat pipe shown in FIG. 1.

3 is a schematic cross-sectional view of the flexible heat pipe of FIG. 1 taken along III-III.

4 is a schematic cross-sectional view of a flexible heat pipe according to a second embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a flexible heat pipe according to a third embodiment of the present invention.

FIG. 6 is a schematic diagram of a flexible heat pipe according to a fourth embodiment of the present invention.

Figure 7 is a schematic view showing the structure of the wire layer shown in Figure 5.

Figure 8 is a schematic view showing the structure of the wire layer shown in Figure 5.

Claims (7)

A flexible heat pipe comprising: a pipe body closed at both ends and a working fluid housed in the pipe body, wherein the pipe body comprises an evaporation section, a condensation section and a heat insulation section, and the insulation section is connected to the evaporation Between the segment and the condensation section; the evaporation section, the condensation section and the insulation section are each provided with a capillary structure, the capillary structure comprises a first layer and a second layer, and the first layer is a groove layer and a copper powder a sintered layer or a wire layer, the second layer being a wire layer, wherein the first layer is directly attached to an inner wall of the pipe body, and the second layer is attached to the first layer; The heat insulating section is a flexible metal bellows, and the metal bellows is bent in any direction; the evaporation section and the condensation section are each a metal tube. The flexible heat pipe according to claim 1, wherein the pipe body comprises an evaporation section, two heat insulation sections and two condensation sections, wherein the two ends of the evaporation section are respectively connected with two heat insulation sections, The two adiabatic sections respectively extend to connect the two condensation sections. The flexible heat pipe according to claim 1, wherein the wire layer is a layered structure in which a plurality of wires are woven. The flexible heat pipe according to claim 1, wherein a gap of the copper powder sintered layer in the evaporation section is larger than a gap of the copper powder sintered layer in the condensation section. The flexible heat pipe of claim 1, wherein the first layer is a copper powder sintered layer. The flexible heat pipe of claim 1, wherein the first layer is a groove layer. The flexible heat pipe according to claim 1, wherein the pipe body is a hollow cylindrical structure.