Micro heat pipe with multi-porous special-shaped composite liquid-absorbing core and preparation method thereof

A liquid-absorbing wick and micro-heat pipe technology, applied in the field of micro-heat pipes, can solve the problems of slow evaporation and condensation, small air flow channels, and small capillary pressure, and achieve the effect of high capillary pressure, large air flow channels, and fast liquid evaporation

Active Publication Date: 2022-02-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The larger area of ​​the hot end and cold end of the liquid-absorbing core can increase the boiling heating area and the condensation cooling area, and the narrower design of the insulation section can provide a larger channel for the airflow, ensure the rapid circulation of the airflow, and speed up the heat transfer as a whole. It solves the technical problems of small airflow channel, small capillary pressure, low permeability, slow evaporation and condensation, and low heat transfer of the existing liquid-absorbing core micro-heat pipe

Method used

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  • Micro heat pipe with multi-porous special-shaped composite liquid-absorbing core and preparation method thereof
  • Micro heat pipe with multi-porous special-shaped composite liquid-absorbing core and preparation method thereof
  • Micro heat pipe with multi-porous special-shaped composite liquid-absorbing core and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] like Figure 1-Figure 5 As shown, a kind of multi-porous special-shaped composite liquid-absorbing core micro heat pipe provided in this example includes a copper-based tube 2, a liquid-absorbing core 1 and a liquid working fluid filled in the liquid-absorbing core, and copper capillary 7 and copper powder 6 are compositely sintered A composite liquid-absorbing core 1 is formed, and the composite liquid-absorbing core 1 is composed of copper powder 6-copper capillary 7-copper powder 6, and the arrangement of copper capillary 7 can be single-layer or multi-layer. The composite liquid-absorbing core 1 is parallel to the copper-based pipe 2 and placed in the center, the two ends of the liquid-absorbing core are sintered and connected to the two ends of the copper-based pipe, and the two ends of the copper-based pipe 2 are closed structures, and the inside is vacuumed. Hydrophilic treatment, and tightly bonded with copper base pipe through sintering.

[0040]The diameter o...

Embodiment 2

[0046] An example of a method for preparing a micro-heat pipe with a porous and special-shaped composite liquid-absorbing core provided by the embodiment of the present invention will be described in detail below.

[0047] (1) Production of the copper-based tube: Use a cutting machine to cut the hollow copper tube into the required length. In this embodiment, the cutting length is 75 mm, and then one end is shrunk. The shrinking length of this embodiment is 14 mm. Put the cut copper tube into the ethanol solution for ultrasonic cleaning to remove the residual oil on the surface, then rinse it with deionized water, put the washed copper tube into the mold of the desired shape, and press it Pressing, in this embodiment, the copper tube is pressed to a thickness of 2.1 mm.

[0048] (2) Production of the liquid-absorbing core: according to the design of the liquid-absorbing core, a graphite mold is customized, a layer of copper powder is laid in the graphite mold, and then a capil...

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Abstract

The invention discloses a multi-porous special-shaped composite liquid-absorbing core micro-heat pipe and a preparation method thereof. The liquid-absorbing core structure is formed by sintering copper powder and copper capillary tubes. The liquid-absorbing core structure adopts various pore structures. The evaporation section of sintered copper powder adopts large pores, the condensation section adopts small pores, and the pore size of the adiabatic section is between the two. The larger pores in the evaporation section can reduce the risk of bubble blockage and greatly increase the speed of bubble detachment, while the smaller pores in the condensation section enhance the capillary condensation effect and accelerate the condensation of gas at the cold end. The multi-directional pore structure of the sintered copper powder provides more space for the gas to escape from the evaporation section and enter the condensation section, and the transverse pore structure of the copper capillary provides strong capillary force for the liquid backflow. The larger hot and cold end areas of the liquid-absorbing core can increase the heating area for boiling and the cooling area for condensation. The narrower design of the insulation section can provide a larger channel for the airflow, ensure the rapid circulation of the airflow, and speed up the heat transfer as a whole.

Description

technical field [0001] The invention relates to the field of micro heat pipes, in particular to a micro heat pipe with porous special-shaped composite liquid-absorbing core and a preparation method thereof. Background technique [0002] With the rapid development of micro-devices and the rapid increase in the integration of electronic chips, the heat flux formed per unit area has risen rapidly. High heat flux has become an important factor affecting the life of electronic chips. The narrowing of product space makes heat dissipation a huge challenge. Traditional heat dissipation methods are difficult to meet the demand. Micro heat pipe technology with strong phase change heat transfer capability is developing rapidly. Micro heat pipes have become one of the most efficient heat dissipation solutions due to their high thermal conductivity, high reliability, and no need for external drivers. [0003] The micro heat pipe relies on the gas-liquid phase change of the internal work...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D15/04
CPCF28D15/046
Inventor 赵振刚彭国洪张延辉张大骋李英娜王娅新李磊
Owner KUNMING UNIV OF SCI & TECH
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