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Through hole metal foam heat pipe heat exchange device with gradient topographic characteristics

A metal foam, heat exchange device technology, applied in indirect heat exchangers, metal processing equipment, manufacturing tools, etc., can solve the problems of large amount of consumables, low heat exchange efficiency of heat pipes, large volume, etc., and increase the heat exchange ratio. The effect of surface area, less metal consumables, and small volume

Inactive Publication Date: 2013-06-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a through-hole metal foam heat pipe heat exchange device with gradual deformation characteristics, which solves the problems of low heat exchange efficiency, large amount of consumable materials, and large volume of existing heat pipes.

Method used

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  • Through hole metal foam heat pipe heat exchange device with gradient topographic characteristics
  • Through hole metal foam heat pipe heat exchange device with gradient topographic characteristics
  • Through hole metal foam heat pipe heat exchange device with gradient topographic characteristics

Examples

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preparation example Construction

[0029] The preparation method of the through-hole metal foam 2 is by investment casting method, and its specific steps include:

[0030] 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 ;

[0031] 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;

[0032] 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;

[0033] 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.

[0034] The refractory ...

Embodiment 1

[0038] like 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.

[0039] 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.

[0040] Specific steps of investment casting method:

[0041] 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 refracto...

Embodiment 2

[0046] The heat pipe 1 is arranged obliquely. The hole density of the through-hole metal foam 2 close to the heat pipe 1 can be selected as the highest hole density 130PPI, and the gradient of the hole density change vertically inward along the wall surface 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 to reduce the effect of gravity on the...

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Abstract

The invention provides a through hole metal foam heat pipe heat exchange device with gradient topographic characteristics and relates to the technical field of rigid heat conductors. The through hole metal foam heat pipe heat exchange device with gradient topographic characteristics comprises a heat pipe and through hole metal foams sintered on the inner wall of the heat pipe. A heat insulation section is arranged on the outer layer in the middle of the heat pipe, and two ends are respectively arranged at the cold end and the hot end of heat exchange environment. The structure of the through hole metal foams is that inner through holes are structures with gradient density, namely porosity factor is the same, and hole density is increased or reduced gradually along the perpendicular direction of the wall surface of the heat pipe; or hole density is the same, and the porosity factor is increased or reduced gradually along the perpendicular direction of the wall surface of the heat pipe; the hole density and the porosity factor are the same, and used materials are changed according to layers. The through hole metal foam heat pipe heat exchange device with gradient topographic characteristics increases heat exchange surface area, facilitates flow and heat exchange of fluid expanded gradually because of being heated, enhances capillary force, and enables the heat pipe to have high heat exchange efficiency under the condition of same heat exchange effect. Metal consumption is small, and volume is small.

Description

technical field [0001] The invention relates to a device in the technical field of using a rigid heat transfer body, in particular to a through-hole metal foam heat pipe heat exchange device with a gradual deformation feature. Background technique [0002] 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 foam is a new type of porous material with a large specific surface area for heat transfer (2000-10000m 2 / m 3 ), the relative density is small (2%-12% of solid material), and it has good mechanical and heat transfer properties. Through-hole metal...

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 JIAO TONG UNIV
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