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Heat exchange device of gradually-varied hole density of through hole metal foam heat pipe

A metal foam and heat exchange device technology, applied in the field of through-hole metal foam heat pipe heat exchange devices with gradually changing pore density, can solve the problems of large amount of consumables, large volume, and low heat exchange efficiency of heat pipes, and achieve increased heat exchange The effect of specific surface area, small volume, and less metal consumables

Active Publication Date: 2015-01-07
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the above-mentioned deficiencies in the prior art, and provides a through-hole metal foam heat pipe heat exchange device with gradually changing hole density, which solves the problems of low heat exchange efficiency, large amount of consumable materials, and large volume of the existing heat pipes.

Method used

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  • Heat exchange device of gradually-varied hole density of through hole metal foam heat pipe
  • Heat exchange device of gradually-varied hole density of through hole metal foam heat pipe
  • Heat exchange device of gradually-varied hole density of through hole metal foam heat pipe

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Experimental program
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preparation example Construction

[0030] The preparation method of the through-hole metal foam 2 is by investment casting method, and its specific steps include:

[0031] The first step is to glue the polyurethane sponge with a pore density range of 3PPI-130PPI and a porosity range of 0.88-0.98 to form a whole; then immerse it in the liquid refractory material so that the refractory material fills its voids ;

[0032] The second step is to heat the polyurethane sponge after hardening to form a three-dimensional skeleton space that replicates the structure of the polyurethane sponge;

[0033] The third step is to pour the molten metal into the mold, and remove the refractory material after the metal is solidified to form a through-hole metal foam 2 with gradual deformation characteristics;

[0034] When preparing the graded metal foam whose material changes according to the layers, the metal foam prepared in the first step to the third step of each layer is welded together by brazing.

[0035] The refractory ...

Embodiment 1

[0039] Such as figure 2 As shown, the through-hole metal foam 2 of the present embodiment is 5 layers of foam: the first through-hole copper foam layer 4, the second through-hole copper foam layer 5, the third through-hole copper foam layer 6, the fourth through-hole copper foam layer layer 7 and fifth via copper foam layer 8.

[0040] The density of 4 holes in the first through-hole copper foam layer is 40PPI; the density of 5 holes in the second through-hole copper foam layer is 30PPI; the density of 6 holes in the third through-hole copper foam layer is 20PPI; the density of 7 holes in the fourth through-hole copper foam layer is 10PPI; the 8-hole density of the fifth through-hole copper foam layer is 5PPI.

[0041] Specific steps of investment casting method:

[0042] The first step is to glue polyurethane sponges with pore densities of 40PPI, 30PPI, 20PPI, 10PPI and 5PPI layer by layer to form a whole; then immerse it in the liquid refractory material so that the refra...

Embodiment 2

[0047] The heat pipe 1 is arranged obliquely. The pore density of the through-hole metal foam 2 close to the heat pipe 1 can be selected as the highest pore density of 130PPI, and the gradient of the pore density change vertically inward along the wall is relatively larger. The porosity is lower than 0.88, and the material is selected. Such as pure copper, brass, etc., in this way, at the hot end, the through-hole metal foam 2 close to the heat pipe 1 is dense, with many vaporization cores, and the gradient of density changes is large, which is more conducive to the rapid concentration of gas to the middle of the heat pipe 1 and rise to the cold end. ; At the cold end, more steam can be taken away by the outside world through the dense metal skeleton close to the heat pipe 1 wall, and the condensation efficiency is higher. If the heat transfer capacity of the heat pipe 1 is small, the inclination of the heat pipe 1 can also be reduced according to the gradient of the correspon...

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Abstract

The invention provides a heat exchange device of a gradually-varied hole density of through hole metal foam heat pipe and relates to the technical field of rigid heat transfer bodies. The heat exchange device comprises the heat pipe and through hole metal foam which is sintered on the inner wall of the heat pipe; an outer layer of the middle of the heat pipe is provided with a heat insulation section; two ends of the heat pipe are arranged at a cold end and a hot end of a heat exchange environment respectively; every through hole which is formed inside the through hole metal foam is of a density gradually-varied structure and namely that the porosity of the through holes is equal to each other and the hole density is gradually increased or decreased along the vertical direction of the wall surface of the heat pipe, the hole density of the through holes is equal to each other and the porosity is gradually increased or decreased along the vertical direction of the wall surface of the heat pipe, or the porosity and the hole density of the through holes are equal to each other and materials change according to layers. According to the heat exchange device of the gradually-varied hole density of through hole metal foam heat pipe, the heat exchange rate surface area is increased and accordingly the flow and the heat exchange of the fluid which is gradually expanded due to the heat are facilitated, the capillary force is enhanced, the heat exchange efficiency of the heat pipe is high under the same heat exchange effect, metal materials are less, and the size is small.

Description

[0001] This application is the application number: 201310051621.8, the name of the invention: through-hole metal foam heat pipe heat exchange device with gradual deformation characteristics, and the application date: 2013 / 2 / 17 divisional application. technical field [0002] The invention relates to a device in the technical field of rigid heat transfer body, in particular to a through-hole metal foam heat pipe heat exchange device with gradually changing hole density. Background technique [0003] A heat pipe is a heat transfer element that combines boiling and condensation heat transfer methods, and is widely used in electronics, aerospace and other fields. If the heat pipe is applied in the field of solar heat collection, it can improve our environmental conditions and promote the progress of energy conservation and emission reduction in our country. How to improve the heat transfer efficiency of the heat pipe is the focus of current research work. Through-hole metal foa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D15/04B22C9/04B22C9/26
CPCF28D15/046
Inventor 徐治国赵长颖王美琴
Owner SHANGHAI JIAOTONG UNIV
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