Heat pipe

Abstract

The invention discloses a heat pipe, which comprises a sealed heat transfer chamber surrounded by a metal shell. The inner surface of the shell is provided with a capillary structure, and an appropriate amount of working fluid is sealed in the heat transfer chamber. The heat transfer chamber Along the length of the cavity, it is divided into an evaporation section, a condensation section and an adiabatic section between them. The heat pipe also includes a sealed heat storage cavity, which is sleeved on the outer wall of the shell of the condensation section of the heat transfer cavity. The outer side of the heat storage cavity has an outer wall. The outer wall of the heat storage cavity is combined with the shell outer wall of the condensation section of the heat transfer cavity to form an annular sealed cavity. The inner surface of the sealed cavity is provided with a capillary structure. An appropriate amount of working fluid is sealed in the sealed cavity.

Description

【Technical field】 [0001] The invention relates to a heat conduction device, in particular to a heat pipe. 【Background technique】 [0002] The heat pipe has the characteristics of ultra-quiet, fast heat transfer, high thermal conductivity, light weight, small size, no moving parts, simple structure and multi-purpose, and the heat pipe can quickly transfer a large amount of heat energy under the condition that the temperature remains almost constant. The role of superconductors is widely used; its basic structure is that the inner wall of the closed tube is lined with a capillary structure layer that is easy to absorb the operating fluid, while the central space is in a hollow state, and the equivalent capillary structure is injected into the vacuumed closed tube. The operating fluid in the total volume of pores in the structural layer can be divided into the evaporation section, the condensation section, and the adiabatic section in between according to the relative position ...

AI Technical Summary

Problems solved by technology

[0003] However, the existing heat pipes are limited by the small heat dissipation area of ​​the condensation section and the poor heat dissipation efficiency of the condensation section, which hinders the reflux of the condensed liquid by capillary force, which leads to premature drying and rapid temperature rise, limiting its maximum heat transfer (Qmax) ; and due to the high "length / inner diameter" ratio of the heat pipe, the heat loss during the steam transmission process causes part of the steam flowing through the center of the heat pipe to condense into liquid droplets in advance and mix in the steam flow, thereby blocking or restricting the flow of steam to The diffusion of the condensation section increases the thermal resistance of the heat pipe and reduces the maximum heat transfer of the heat pipe; and because the traditional heat pipe has a uniform thickness of the capillary structure layer and the diameter of the steam flow channel, the steam absorbed by the evaporation section evaporates along the steam flow channel. The speed of transmission to the condensation section is reduced, which promotes the loss of heat and increases the temperature difference (ΔT) from the evaporation section to the condensation section

The method of heat pipes in the prior art to increase the maximum heat transfer is to increase the thickness of the capillary structure layer of the entire heat pipe to increase the water content in it, but relatively, it also makes the reaction time of the heat pipe longer and the temperature difference between the two ends increases. On the contrary, the method for reducing the temperature difference is to thin the thickness of the capillary structure layer of the whole heat pipe to reduce the water content in it, but relatively, it also reduces the maximum heat transfer of the heat pipe

This creates a more difficult contradiction to overcome

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