CN-121985510-A - Soaking plate capillary core and preparation method thereof, soaking plate and electronic device

CN121985510ACN 121985510 ACN121985510 ACN 121985510ACN-121985510-A

Abstract

The invention relates to the technical field of heat exchange of electronic devices, in particular to a vapor chamber capillary core, a preparation method thereof, a vapor chamber and an electronic device. The soaking plate capillary core is an implantable functional lattice capillary core, and aims to utilize the performance advantage of an advanced lattice structure, and obtain a huge specific surface area by designing a more complex microstructure while maintaining high porosity, so that the traditional contradiction between capillary performance and permeability in the traditional capillary core is broken. In the vapor chamber capillary core, by arranging different lattice structures at the evaporation end and the condensation end, the gradient design of the composite lattice capillary core module is realized, and completely different capillary core structures are adopted from the evaporation end to the condensation end, so that the processes of evaporation and condensation with distinct physical requirements can be pertinently optimized, and the heat transfer limit of the vapor chamber is improved and optimized compared with that of the traditional sintered copper powder structure.

Inventors

LIU BIN
GAO YUAN
YANG YAQIN
LI ZHONGHUA
CHEN XUELI
ZHANG YAOXIAN

Assignees

中北大学

Dates

Publication Date: 20260505
Application Date: 20260206

Claims (10)

1. The vapor chamber capillary core is characterized by comprising an evaporation end block (12) formed by a lattice structure and a condensation end block (11) formed by the lattice structure, wherein the lattice structures of the evaporation end block (12) and the condensation end block (11) are different, and the lattice structures of the evaporation end block (12) and the condensation end block (11) are communicated to form a continuous reflux path of the whole capillary core, and the vapor chamber capillary core comprises the following components: the evaporation end block (12) is arranged at the evaporation end of the soaking plate and can generate capillary force at the evaporation end and strengthen evaporation of the thin liquid film; The condensing end block (11) is used for being distributed at the condensing end of the vapor chamber, and can enhance the permeability of condensate reflux and vapor circulation of the condensing end.
2. The vapor chamber capillary wick according to claim 1, wherein the evaporation end block (12) and the condensation end block (11) have an I-WRAPPED PACKAGE lattice structure and a Neovius lattice structure, respectively, or The evaporation end block (12) and the condensation end block (11) respectively adopt Gyroid lattice structures and Diamond lattice structures.
3. The vapor chamber capillary core according to claim 1 or 2, wherein the vapor chamber capillary core (1) is a cylindrical capillary core, a prismatic capillary core or a special-shaped cylindrical core with an elliptical cross section; The evaporation end block (12) and the condensation end block (11) are respectively positioned at two axial ends of the vapor chamber capillary core (1); The evaporation end block (12) and the condensation end block (11) are closely arranged, or the evaporation end block (12) and the condensation end block (11) are separated by a supporting block (6).
4. A method for manufacturing a vapor chamber capillary core according to any one of claims 1 to 3, comprising: generating a first solid phase unit model adapted to the evaporation end block (12) and a second solid phase unit model adapted to the condensation end block (11) respectively through modeling software; Respectively carrying out three-dimensional periodic arrays on the solid-phase unit model I and the solid-phase unit model II through three-dimensional printing data and construction preparation software, and combining the solid-phase unit model I and the solid-phase unit model II after the arrays into a complete composite lattice capillary core model in the software; and printing the composite lattice capillary core model by a metal 3D printing technology or manufacturing the composite lattice capillary core model by adopting a casting process to obtain the vapor chamber capillary core (1).
5. The soaking plate is characterized by comprising a shell and the soaking plate capillary core (1) according to any one of claims 1-3, wherein the soaking plate capillary core (1) is fixed in the shell, a cavity between the soaking plate capillary core (1) and the inner wall of the shell and the continuous reflux path in the soaking plate capillary core (1) are communicated to form a steam runner in the soaking plate, and a liquid filling pipe (5) communicated with the steam runner is further arranged on the shell.
6. A soaking plate according to claim 5, characterized in that the inner cavity profile of the housing is adapted to the outer profile of the soaking plate capillary core (1).
7. The vapor chamber of claim 5, wherein the housing comprises an evaporation end half-shell (3) and a condensation end half-shell (4) in sealing butt joint with the evaporation end half-shell (3), the evaporation end block (12) is arranged in the evaporation end half-shell (3), the condensation end block (11) is arranged in the condensation end half-shell (4), and the liquid filling pipe (5) is arranged on the side wall of the evaporation end half-shell (3).
8. The vapor chamber according to any one of claims 5-7, further comprising a spacer block fixed inside the housing, wherein the spacer block is supported between the evaporation end block (12) and the housing and between the condensation end block (11) and the housing.
9. The vapor chamber according to claim 8, characterized in that the vapor chamber capillary core (1), the spacer block and the housing are metallurgically bonded by a sintering process.
10. An electronic device, characterized in that the heat dissipation system of the electronic device comprises a soaking plate (2) according to any one of claims 5-9.

Description

Soaking plate capillary core and preparation method thereof, soaking plate and electronic device Technical Field The invention relates to the technical field of heat exchange of electronic devices, in particular to a novel vapor chamber capillary core, a preparation method thereof, a vapor chamber and an electronic device. Background Currently, with the rapid development of 5G communication, high-performance calculation and artificial intelligent chips, the heat flux density of electronic devices continuously rises, and the requirements of higher and higher heat dissipation efficiency are provided for phase change heat transfer devices such as soaking plates and the like. The traditional soaking plate generally adopts sintered copper powder or a wire mesh as a capillary core, and the structure mainly comprises an upper shell, a lower shell, a random porous capillary core layer sintered on the inner wall of the shell and solid support columns distributed in a cavity, wherein the upper shell and the lower shell are sealed through welding. The components are connected by high-temperature sintering and brazing processes, wherein the capillary core and the shell form metallurgical bonding, two ends of the solid support column are fixedly connected with the inner walls of the upper shell and the lower shell, and the capillary core, the shell and the solid support column form the composite structure vapor chamber with capillary transport, vapor flow and mechanical support functions. The prior art is mature and widely applied, but has the inherent defect that the random porous structure of ① sintered capillary cores causes mutual restriction of capillary performance and permeability, and cannot realize high capillary force and high permeability at the same time. Increasing capillary force requires decreasing pore size but significantly decreasing permeability, whereas increasing pores to increase permeability would impair capillary suction capacity. The reason is that the structured copper powder particles are randomly packed and sintered, and the resulting network of pores has substantial disorder and uncertainty in size, shape and spatial distribution. The key parameters of the structure, such as porosity, pore diameter, specific surface area and the like, are mutually coupled and cannot be independently and accurately designed and controlled. ② The ability of such homogeneous capillary cores, such as wire mesh, to achieve functionally graded changes in material or structure within a single component limits the heat transfer limitations and performance enhancement of the vapor chamber. ③ The vapor chamber adopts the identical capillary core structure from the evaporation end to the condensation end, and cannot be optimized according to the heterogeneous requirements of evaporation/condensation, so that the capillary force of the evaporation end is conservatively designed, and the flow resistance of the condensation end is passively increased. In summary, the conventional vapor chamber capillary core is based on the above inherent limitation, so that the performance of the vapor chamber is forced to be compromised at a compromise level, and an optimal solution of the system-level performance cannot be achieved, and the requirement of high heat dissipation efficiency of the phase change heat transfer device such as the vapor chamber cannot be met. Disclosure of Invention The invention aims to provide a novel vapor chamber capillary core, a preparation method thereof, a vapor chamber and an electronic device, so as to solve the problems in the prior art, enable the vapor chamber capillary core to break through the inherent limitations, realize the cooperative promotion and innovation of capillary performance, flow characteristics and heat transfer efficiency on the premise of maintaining necessary structural support, and meet the requirement of high heat dissipation efficiency of phase change heat transfer devices such as vapor chamber and the like. In order to achieve the above object, the present invention provides the following solutions: In one aspect, the invention provides a vapor chamber capillary core, comprising an evaporation end block formed by a lattice structure and a condensation end block formed by a lattice structure, wherein the lattice structures of the evaporation end block and the condensation end block are different, and the lattice structures of the evaporation end block and the condensation end block are communicated to form a continuous reflux path of the whole capillary core, wherein: The evaporation end block is arranged at the evaporation end of the soaking plate and can generate capillary force at the evaporation end and strengthen evaporation of the thin liquid film; the condensing end block is used for being distributed at the condensing end of the vapor chamber, so that the permeability of condensate reflux and vapor circulation at the condensing end can be enhanced. In some embodiment