flat heat pipe

Abstract

A flat heat pipe includes a sealed casing, a cavity formed inside the casing and working medium arranged inside the cavity, and is provided with an evaporation section and a condensation section, wherein a first capillary structure and a second capillary structure connected with the first capillary structure are arranged inside the casing; the first capillary structure is clung to the partial inner wall of the evaporation section and is vertically separated from the condensation section; the second capillary structure is arranged at the axis of the casing, and extends to the condensation section along the evaporation section of the flat heat pipe, so that the flat heat pipe is smaller in liquid backflow resistance and bigger in capillary acting force, increases the capillary acting force of the flat heat pipe near to a heat source, and guarantees that the cavity inside the flat heat pipe has a bigger space.

Description

technical field [0001] The invention relates to a heat transfer device, in particular to a flat heat pipe. Background technique [0002] Heat pipes are widely used due to their characteristics of ultra-quiet, high thermal conductivity, light weight, small size, simple structure and multi-purpose. The space is in the state of a hollow body, and the working fluid is injected into the vacuumed airtight pipe. The heat pipe is divided into an evaporation section and a condensation section according to the relative position of heat absorption and dissipation; its working principle is to transfer heat through the vapor-liquid two-phase change of the working liquid. First, the working liquid absorbs the heat from the heat source in the evaporating section, evaporates the working liquid and makes the steam quickly pass through the space in the tube, and reaches the condensing section to cool and condense into a liquid and release heat energy. The working liquid in the condensing sec...

AI Technical Summary

Problems solved by technology

[0003] At present, the capillary structure in the heat pipe is usually a single capillary structure, and the return channel of the condensed liquid in the condensation section of the heat pipe with a single capillary structure uses the same capillary structure at the position of the heat source in the evaporation section to make each part of the heat pipe work The maximum heat flux density that can be tolerated locally is almost the same, and it is impossible to have a small liquid return resistance and a large capillary force at the same time

For this reason, the industry adopts a multi-layer composite capillary structure to enhance the capillary force, and this setting will reduce the flow space of the gaseous working medium in the inner cavity of the heat pipe, especially when the heat pipe is flattened to a thinner thickness , will affect its thermal conductivity

Images