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Flat plate type loop heat pipe evaporator and loop heat pipe

A loop heat pipe and evaporator technology, applied in indirect heat exchangers, lighting and heating equipment, etc., can solve problems such as difficult startup, large reverse heat conduction effect, and blocked liquid return, so as to increase roughness and reduce operation failure Risk, the effect of reducing the reverse heat conduction effect

Inactive Publication Date: 2017-05-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The evaporator can effectively solve the problems of the existing flat plate evaporator with large reverse heat conduction effect, difficulty in starting, and blocked liquid return, and can ensure the normal and stable operation of the evaporator

Method used

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  • Flat plate type loop heat pipe evaporator and loop heat pipe
  • Flat plate type loop heat pipe evaporator and loop heat pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The heat-insulating barrier 7 and the heat-insulating layer 5 of the inner wall of the liquid storage chamber 2 are prepared by spraying by plasma spraying, first spraying Ni(Al) with a thickness of 30 microns as the bonding layer, and then continuing to spray Ni(Al) with a thickness of 150 microns on it. The aluminum coating is used as the heat insulating layer 7, and its surface roughness is 15 μm. The steam channel bottom plate 1 of the evaporator and the liquid storage chamber 2 are sealed and connected by laser welding. The working medium is pure water.

[0036] After adopting the evaporator of the present invention, in the working environment of the evaporator steam channel bottom plate 1 at 70°C, the heat insulation layer 5 and the heat insulation spacer 7 can reduce 80-90% of the heat leakage generated through the side wall, and the loop heat pipe It can not only start smoothly, but also work stably for a long time.

Embodiment 2

[0042] In analogy to Example 1, only the heat insulating layer 7 and the heat insulating layer 5 are changed to MCrAlY with a thickness of 50 μm as the bottom bonding layer, and zirconia with a thickness of 200 μm as the heat insulating layer, and the rest of the preparation method is the same as that of Example 1.

[0043] The loop heat pipe adopted by the invention can start smoothly and work stably for a long time in an environment of 60-80 degrees.

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Abstract

The invention discloses a flat plate type loop heat pipe evaporator and a loop heat pipe. The flat pipe type loop heat pipe evaporator comprises an evaporation chamber, a capillary core and a liquid storage chamber. The evaporation chamber communicates with the liquid storage chamber through the capillary core. The inner wall of the liquid storage chamber is covered with a heat insulation layer. The surface of the heat insulation layer is coarsely arranged. By means of the heat insulation layer, the heat transfer resistance produced when heat is transferred from the wall face of the liquid storage chamber to a working medium in the liquid storage chamber is increased, heat leaked to the working medium in the liquid storage chamber through the wall face and the side wall is reduced, the reverse heat conduction effect of the evaporator is reduced, the temperature difference of the two sides of the capillary core is ensured, the start speed of the evaporator is increased, and operation failure of the flat plate type loop heat pipe is avoided; and meanwhile, due to the fact that the surface of the heat insulation layer is coarsely arranged, the capillary effect is formed on the surface of the heat insulation layer, and liquid obtained through condensation can flow back into the liquid storage chamber.

Description

technical field [0001] The invention belongs to the related technical field of enhanced heat exchange, and specifically relates to a flat-plate loop heat pipe evaporator and a loop heat pipe. The reverse heat conduction effect (heat leakage) of the chamber can solve the problem that the liquid return flow of the loop heat pipe is blocked. Background technique [0002] The loop heat pipe is a high-efficiency heat transfer device that drives the flow of the working medium through the capillary force generated by the capillary core in the evaporator, and uses the phase change process of the working medium to transfer heat. After years of development, its technology has become increasingly mature and gradually applied to thermal control systems in space vehicles, electronic equipment and other fields. [0003] The loop heat pipe is mainly composed of evaporator, capillary wick, liquid storage chamber, liquid pipeline, steam pipeline and condensation section. The evaporator is t...

Claims

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Application Information

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IPC IPC(8): F28D15/04
CPCF28D15/043
Inventor 刘峻瑜栾涛邹勇王德馨
Owner SHANDONG UNIV
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