Heat pipe with composite capillary wick structure

Abstract

A heat pipe includes a metal casing (100) and a composite capillary wick received in the casing. The metal casing has an evaporating section (400), a condensing section (600) and a central section (500) between the evaporating section and the condensing section. First type of capillary wick (200) is provided on an inner all of the metal casing at all of the condensing, central and evaporating sections, while second type of capillary wick (220) is provided on the first type of capillary wick at the central and evaporating sections only. A capillary pore size of the first type of capillary wick is larger than that of the second type of capillary wick.

Description

1. FIELD OF THE INVENTION[0001]The present invention relates generally to a heat transfer apparatus, and more particularly to a heat pipe having a composite capillary wick structure.2. DESCRIPTION OF RELATED ART[0002]As a heat transfer apparatus, heat pipes can transfer heat rapidly and therefore are widely used in various fields for heat dissipation purposes. Fox example, in electronic field, heat pipes are commonly applied to transfer heat from heat-generating electronic components, such as central processing units (CPUs), to heat dissipating devices, such as heat sinks, to thereby remove the heat away. A heat pipe in accordance with related art generally includes a sealed casing made of thermally conductive material and a working fluid contained in the casing. The casing includes an evaporating section at one end and a condensing section at the other end. The working fluid is employed to carry heat from the evaporating section to the condensing section of the casing. Specifically...

AI Technical Summary

Benefits of technology

[0006]A heat pipe in accordance with a preferred embodiment of the present invention includes a metal casing and a composite capillary wick arranged on an inner surface of the casing. The casing has an evaporating section, a condensing section and an adiabatic central section between the evaporating section and the condensing section. A first type of capillary wick is provided on an inner wall of the casing at the evaporating, condensing and central sections of the casing. A second type of capillary wick is provided on the first type of capillary wick at the evaporating and central sections of the casing. A capillary pore size of the first type of capillary wick is larger than that of the second type of capillary wick.

Problems solved by technology

However, this single-type, uniform wick 20 generally cannot provide optimal heat transfer effect for the heat pipe because it cannot simultaneously obtain a large capillary force and a low flow resistance.

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