# US 7,743,819 B2 · Heat pipe and method for producing the same

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- Number: US 7,743,819 B2
- Document ID: US7743819B2
- Status: Granted
- Kind: B2
- Application number: 11/309,248
- Filed: 2006-07-19
- Published: 2007-10-18
- Granted: 2010-06-29
- Earliest claimed: 2006-04-14
- Assignees: Foxconn Technology Co., Ltd.
- Inventors: Tay-Jian Liu; Chao-Nien Tung; Chuen-Shu Hou
- Web page: https://patentgrep.com/patent/US7743819B2

## CPC

- F28D 15/046: {characterised by the material or the construction of the capillary structure}
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)

## Abstract

A heat pipe and a method for producing the heat pipe are disclosed. The heat pipe includes a hollow metal casing and a honeycombed wick structure arranged at an inner surface of the hollow metal casing. The wick structure includes a plurality of slices stacked together. Each of the slices defines a plurality of pores therein to form a plurality of micro-channels in the wick structure, whereby porosity of the wick structure can be accurately controlled.

## Claims

### Claim 1

A heat pipe comprising:
a hollow metal casing; and
a honeycombed wick structure arranged at an inner surface of the hollow metal casing, the wick structure including a plurality of slices stacked together and forming a plurality of micro-channels between the slices, each of the slices defining a plurality of pores therein;
wherein each of the plurality of pores extends towards a direction different from a direction which the plurality of micro-channels extends towards; and
wherein each of the pores has an annular sidewall protruding from a surface of a corresponding one of the plurality of slices.

### Claim 2 (depends on 1)

The heat pipe of claim 1, wherein the slices include a plurality of wave-shaped first slices and a plurality of flat second slices, the first and second slices being alternatively stacked together.

### Claim 3 (depends on 1)

The heat pipe of claim 1, wherein the metal casing has an evaporating section for receiving heat from a heat generating electronic component, a condensing section for releasing the heat and an adiabatic section between the evaporating and condensing sections.

### Claim 4 (depends on 3)

The heat pipe of claim 3, further comprising a vapor-liquid isolation member attached on an inner face of the capillary wick at the adiabatic section.