CN114184072A - Liquid absorption core preparation method and heat pipe comprising liquid absorption core - Google Patents

Abstract

The invention discloses a wick preparation method and a heat pipe comprising the wick, and relates to the technical field of wicks, and the wick preparation method comprises the following steps: carrying out hydrophilic treatment on the inner wall of the heat pipe shell; placing the microsphere suspension on the inner wall of the heat pipe shell, automatically paving microspheres in the microsphere suspension by utilizing the hydrophilicity of the inner wall of the heat pipe shell, and contacting and stacking adjacent microspheres to form a microsphere template with a body-centered cubic close-packed structure; after the liquid of the microsphere suspension is evaporated, carrying out heat treatment on the microsphere template to connect the contact positions of the microspheres; filling a metal material in gaps among the microspheres; dissolving each microsphere, and removing the dissolved liquid to form a skeleton. The wick prepared by the method has good capillary performance, and the heat pipe prepared by the wick has better heat transfer performance compared with the traditional heat pipe, and can radiate the equipment better.

Description

Liquid absorption core preparation method and heat pipe comprising liquid absorption core

Technical Field

The invention relates to the technical field of liquid absorption cores, in particular to a liquid absorption core preparation method and a heat pipe comprising the liquid absorption core.

Background

The heat pipe is an important heat transfer element in heat management or heat design, has good isothermal property, and has wide application in electronic equipment heat management. The development trend of electronic products with high power consumption, high performance and small size makes the thickness of the heat pipe thinner and thinner. At present, the heat transfer limit of the ultrathin heat pipe is smaller, and the heat dissipation requirement of further development of electronic products is difficult to meet.

The liquid absorption core comprises a pipe shell, a liquid absorption core and working liquid, and the liquid absorption core is the key for improving the heat transfer performance of the heat pipe. The porous medium liquid absorption core has excellent capillary performance, can effectively promote capillary backflow of working media, and improves the heat transfer performance of the heat pipe. The thickness of the existing porous media such as spiral woven mesh, foam copper, sintered copper powder and the like is difficult to control in the preparation process, so that the application of the porous media in the ultrathin heat pipe is limited. In addition, the regular pore structure can improve the capillary performance of the porous medium, but in the preparation process of the existing porous medium by using a sintering method, a weaving method and other methods, the formation of the internal pore structure of the existing porous medium is random and is difficult to regulate and control, so that the capillary performance of the existing porous medium is difficult to further improve under the extremely limited volume.

Disclosure of Invention

The invention provides a liquid absorption core preparation method and a heat pipe comprising the liquid absorption core, which are used for solving the problems in the prior art, improving the capillary performance of the liquid absorption core and improving the heat transfer performance of the heat pipe.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a wick preparation method, which comprises the following skeleton preparation steps:

s1: carrying out hydrophilic treatment on the inner wall of the heat pipe shell;

s2: placing microsphere suspension on the inner wall of the heat pipe shell, automatically paving microspheres in the microsphere suspension by utilizing the hydrophilicity of the inner wall of the heat pipe shell, and forming a microsphere template with a body-centered cubic close-packed structure by contacting and stacking adjacent microspheres;

s3, after the liquid of the microsphere suspension is evaporated, carrying out heat treatment on the microsphere template to connect the contact positions of the microspheres;

s4: filling copper in gaps between each of the microspheres;

s5: dissolving each microsphere, and removing the dissolved liquid to form the skeleton.

Further, the method for preparing the wick further comprises the step of S6: and forming a nano microstructure on the surface of the skeleton, wherein the nano microstructure has super-hydrophilicity.

Further, the method for preparing the wick further comprises the step of S7: and a plurality of support columns are arranged at one end of the framework, which is far away from the inner wall of the heat pipe shell, and the support columns are used for supporting the heat pipe shell.

Further, in step S1, the inner wall of the heat pipe shell is subjected to hydrophilic treatment by an oxidation method or a magnetron sputtering method.

Further, in step S3, the microsphere suspension is heated to accelerate the liquid evaporation rate of the microsphere suspension.

Further, in step S4, the metal material is copper, and the copper is deposited in the gaps between the microspheres by using an electrodeposition technique.

Further, in step S5, the microsphere suspension is a polystyrene microsphere suspension, and each of the microspheres is dissolved by using tetrahydrofuran.

Further, in step S6, a nano-microstructure is formed on the surface of the skeleton by using an oxidation method.

Further, in step S7, an end of the skeleton away from the inner wall of the heat pipe shell is processed by etching to form the supporting pillar.

The invention also provides a heat pipe, which comprises a pipe shell, working liquid and the liquid absorption core prepared by the liquid absorption core preparation method, wherein the pipe shell is a vacuum-sealed hollow shell, the working liquid is filled in the pipe shell, and the liquid absorption core is fixedly arranged in the pipe shell.

Compared with the prior art, the invention has the following technical effects:

the invention provides a wick preparation method and a heat pipe comprising the wick, wherein the skeleton with a regular porous structure can be prepared by using the skeleton preparation steps, and the regular porous structure can improve the flow efficiency of liquid in the wick so as to improve the capillary property of the wick.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a block diagram of a wick provided by the present invention;

FIG. 2 is a view showing the internal structure of the heat pipe according to the present invention;

description of reference numerals: 1. an upper cover; 2. a lower cover; 3. aliquid absorption core 4 and a support column; 5. a framework; 6. connecting holes; 7. a cavity; 100. a heat pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a liquid absorption core preparation method and a heat pipe comprising the liquid absorption core, which are used for solving the problems in the prior art, improving the capillary performance of the liquid absorption core and improving the heat transfer performance of the heat pipe

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example 1

The embodiment provides a wick preparation method, which comprises the following steps of:

s1: performing hydrophilic treatment on the inner wall of the tube shell of theheat pipe 100 by using an oxidation method or a magnetron sputtering method to ensure that the inner wall of the tube shell of theheat pipe 100 has hydrophilicity;

s2: placing the microsphere suspension on the inner wall of the tube shell of theheat pipe 100, automatically laying microspheres in the polystyrene microsphere suspension by utilizing the hydrophilicity of the inner wall of the tube shell of theheat pipe 100, and contacting and stacking adjacent microspheres to form a microsphere template with a body-centered cubic close-packed structure;

s3, evaporating the liquid of the microsphere suspension, preferably heating the microsphere suspension to accelerate the evaporation of the microsphere suspension, and after the liquid of the microsphere suspension is completely evaporated, carrying out heat treatment on the microsphere template to ensure that the contact positions of the microspheres are adhered;

s4: the copper is filled in the gaps among the microspheres by utilizing the electrodeposition technology, specifically, the copper can fill the gaps among the microspheres, preferably, the microspheres are deposited layer by layer from bottom to top by utilizing the electrodeposition technology, and the method can control the thickness of theframework 5 to adapt to the requirements of theheat pipes 100 with different sizes;

s5: dissolving each microsphere, preferably, the microsphere suspension is polystyrene microsphere suspension, a reagent for dissolving the microspheres is tetrahydrofuran, the dissolved liquid is removed to form aframework 5, theframework 5 comprises acavity 7 left after the microspheres are dissolved and connectingholes 6 left after the contact positions of adjacent microspheres are dissolved, and theadjacent cavities 7 are connected by the connectingholes 6 to form theframework 5 with regular holes.

S6: the nano-microstructure is formed on the surface of theskeleton 5, and preferably, an oxidation method may be used. The nano-micro structure has super-hydrophilicity, and can improve the capillary performance of theliquid absorption core 3, improve the gas-liquid conversion efficiency of the working liquid, and further improve the heat dissipation performance of theheat pipe 100.

S7: a plurality of regularly arrangedsupport pillars 4 are formed at one end of theframework 5 away from the inner wall of the pipe shell of theheat pipe 100, preferably, etching, photoetching, machine tool machining and other methods can be adopted, and thesupport pillars 4 are used for supporting the pipe shell of theheat pipe 100, so that theheat pipe 100 has higher strength and is prevented from being damaged under the action of external force.

Thewick 3 prepared by using thewick 3 provided by the embodiment can control the size of theframework 5 according to the requirement, so that the adaptability of thewick 3 is improved, and thewick 3 has a regular porous structure, so that the capillary performance of thewick 3 is improved.

Example 2

The present embodiment provides aheat pipe 100, which includes a pipe shell, a working fluid, and awick 3 prepared according to the wick preparation method inembodiment 1, where the pipe shell is a vacuum-sealed hollow shell, the working fluid is filled in the pipe shell, thewick 3 is fixedly disposed in the pipe shell, specifically, the pipe shell includes anupper cover 1 and alower cover 2, thelower cover 2 is a shell with an open lower end, thelower cover 2 seals the open end of theupper cover 1 to form a vacuum-sealedcavity 7, and thewick 3 is fixedly disposed on the inner surface of theupper cover 1 or thelower cover 2. The capillary performance of theliquid absorption core 3 of theheat pipe 100 is improved, so that the circulation speed of the working liquid in the pipe shell is increased, the gas-liquid phase change of the working liquid is promoted, theheat pipe 100 in the embodiment is better in heat transfer performance compared with thetraditional heat pipe 100, and theheat pipe 100 can better radiate the heat of equipment.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (10)

1. A method for preparing a wick, comprising: the preparation method comprises the following steps:

s1: carrying out hydrophilic treatment on the inner wall of the heat pipe shell;

s2: placing microsphere suspension on the inner wall of the heat pipe shell, automatically paving microspheres in the microsphere suspension by utilizing the hydrophilicity of the inner wall of the heat pipe shell, and forming a microsphere template with a body-centered cubic close-packed structure by contacting and stacking adjacent microspheres;

s3, after the liquid of the microsphere suspension is evaporated, carrying out heat treatment on the microsphere template to connect the contact positions of the microspheres;

s4: filling a metal material in gaps between the microspheres;

s5: dissolving each microsphere, and removing the dissolved liquid to form the skeleton.

2. A method of making a wick according to claim 1, wherein: further comprising S6: and forming a nano microstructure on the surface of the skeleton, wherein the nano microstructure has super-hydrophilicity.

3. A method of making a wick according to claim 1, wherein: further comprising S7: and a plurality of support columns are arranged at one end of the framework, which is far away from the inner wall of the heat pipe shell, and the support columns are used for supporting the heat pipe shell.

4. A method of making a wick according to claim 1, wherein: in step S1, the inner wall of the heat pipe shell is subjected to hydrophilic treatment by an oxidation method or a magnetron sputtering method.

5. A method of making a wick according to claim 1, wherein: in step S3, the microsphere suspension is heated to accelerate the liquid evaporation rate of the microsphere suspension.

6. A method of making a wick according to claim 1, wherein: in step S4, the metal material is copper, and the copper is deposited in the gaps between the microspheres by an electrodeposition technique.

7. A method of making a wick according to claim 1, wherein: in step S5, the microsphere suspension is a polystyrene microsphere suspension, and each of the microspheres is dissolved using tetrahydrofuran.

8. A method of manufacturing a wick according to claim 2, wherein: in step S6, a nano-microstructure is formed on the surface of the skeleton by an oxidation method.

9. A method of manufacturing a wick according to claim 3, wherein: in step S7, the end of the skeleton away from the inner wall of the heat pipe shell is processed by etching to form the supporting pillar.

10. A heat pipe, characterized by: the liquid absorption core prepared by the liquid absorption core preparation method according to any one of claims 1 to 9, and the pipe shell is a vacuum-sealed hollow shell, the working liquid is filled in the pipe shell, and the liquid absorption core is fixedly arranged in the pipe shell.

Images