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Loop heat pipe evaporator

A loop heat pipe and evaporator technology, applied in indirect heat exchangers, lighting and heating equipment, etc., can solve problems such as different sintering temperatures of capillary wicks, difficult bonding of dissimilar metal interfaces, and blocking of capillary wick liquid supply, etc., to achieve Improve starting performance and running stability, good heat insulation effect, and reduce circulation resistance

Active Publication Date: 2018-07-24
BEIJING INST OF SPACECRAFT SYST ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The double-layer capillary core is feasible in theory, but there are two problems in implementation: 1) The sintering temperature of the two capillary cores is different, it is difficult to sinter together, and it is difficult to combine dissimilar metal interfaces well. or vapor, which will block the liquid supply to the capillary
2) It is also more difficult to isolate and seal the evaporator and the liquid reservoir with the double-layer capillary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] A rectangular flat-plate loop heat pipe evaporator 14, the shell 1 is rectangular, the size is 30mm*60mm*2mm, the thickness is 0.5mm, the material is stainless steel, and the limiting tool 6, the steam channel forming tool 7 and the construction are adopted. A mold composed of pressing tooling 8; wherein, the bottom of the limiting tooling 6 is rectangular, and a rectangular limiting boss is provided on it, the housing 1 can be set on the limiting boss and closely matched with it, and the steam channel forming tooling 7 It is strip-shaped, with a square cross-section, a size of 1mm*1mm, and consists of seventeen pieces. The pressure-applying tool 8 can be placed inside the shell 1 and fit closely; the steps of the preparation method are as follows:

[0085] (1) Fix and assemble the steam channel forming tooling 7 on the limiting tooling 6, and arrange them neatly close to the side of the limiting boss, and the top of the steam channel forming tooling 7 protrudes from the...

Embodiment 2

[0099] A disc-shaped flat-plate loop heat pipe evaporator 14, the shell 1 is cylindrical, with a diameter of 25 mm, a height of 1 cm, and a thickness of 0.5 mm. The material is stainless steel, and the limiting tool 6 and the steam channel forming tool 7 are used A mold composed of pressure-applying tooling 8; wherein, the limiting tooling 6 is disc-shaped, and its surface is processed with steam channel forming tooling 7, the structure is seven cube protrusions, the cross-sectional size is 1mm*1mm, and the outer peripheral contour is a disc shape, the shell 1 can be just set on the steam channel forming tool 7, and the pressure applying tool 8 can be just placed inside the shell 1 and closely matched; the steps of the preparation method are as follows:

[0100] (1) Fix and assemble the steam channel forming tool 7 on the limit tool 6, and arrange it neatly close to the side of the limit boss. The height of the steam channel forming tool 7 is 1 mm; fix the shell 1 on the limit ...

Embodiment 3

[0114] A cylindrical loop heat pipe evaporator 14, the shell 1 is cylindrical, the diameter is 13 mm, the height is 100 mm, the thickness is 0.5 mm, the material is stainless steel, and the limiting tool 6, the steam channel forming tool 7 and the pressure are applied A mold composed of tooling 8; wherein, the bottom of the limiting tooling 6 is cylindrical, and a cylindrical limiting boss is provided on it, and a cylindrical hole-forming column is arranged on the limiting boss, and the hole-forming column has a diameter ranging from large to large. To the small hole-forming column of the evaporation core, the hole-forming column of the heat-insulating core and the hole-forming column of the transmission core, respectively match the diameter of the inner hole of the cylindrical evaporation core 2, the heat-insulating core 3 and the transmission core 4, and the structure of the vapor channel forming tooling 7 It is composed of eight cylinders with a diameter of 1mm and a length ...

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Abstract

The invention relates to a loop heat pipe evaporator and belongs to the technical field of heat control. In the evaporator, a compound porous wick is formed by sequentially compounding an evaporationcore, a heat insulation core and a transmission core; an evaporation channel is arranged on one side of the evaporation core; one side of the transmission core is close to a liquid accumulator of a loop heat pipe; the evaporation core and the transmission core are made of the same material; the heat conductivity coefficient of the material of the evaporation core and the transmission core is larger than the heat conductivity coefficient of a material of the heat insulation core; the melting point of the material of the evaporation core and the transmission core is lower than the melting pointof the material of the heat insulation core; the melting point of a material of a shell is larger than or equal to the melting point of the material of the evaporation core and the transmission core;the evaporation core, the transmission core and the heat insulation core are made of powder materials and are put into the shell; the evaporation core and the transmission core are hot-pressed, sintered and formed so as to be sealed with the shell, and the heat insulation core is powder; and the particle size of the powder material of the transmission core is larger than or equal to the particle size of the powder material of the evaporation core. According to the evaporator, heat leakage toward the liquid accumulator is effectively reduced, the capillary force is improved, meanwhile, the permeability is improved, and the problem that the heat conductivity coefficient and the permeability of the loop heat pipe porous wick can not give consideration to the improvement of a heat transfer performance, a starting performance and operation stability is solved.

Description

technical field [0001] The invention relates to a loop heat pipe evaporator, which belongs to the technical field of heat control. Background technique [0002] The loop heat pipe is a high-efficiency two-phase heat transfer device, which has the characteristics of high heat transfer performance, long-distance heat transfer, excellent temperature control characteristics, arbitrary bending of the pipeline, and convenient installation. With comparable advantages, the loop heat pipe has very broad application prospects in many fields such as aviation, aerospace, and ground electronic equipment heat dissipation (Zhang Hongxing, Theoretical and experimental research on loop heat pipe two-phase heat transfer technology, doctoral thesis, Beijing University of Aeronautics and Astronautics, 2016.). [0003] The loop heat pipe mainly includes an evaporator, a condenser, a liquid receiver, a vapor line and a liquid line. The whole cycle process is as follows: the liquid evaporates on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D15/04
Inventor 张红星满广龙李国广励精图治
Owner BEIJING INST OF SPACECRAFT SYST ENG