Heat pipe having wick formed with hydrophilic and water-repellent treated surfaces

Patent metadata

Field	Value
Publication number	US-9982949-B2
Application number	US-201514658292-A
Country	US
Kind code	B2
Filing date	Mar 16, 2015
Priority date	Apr 8, 2014
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A heat pipe provided inside with a wick formed of a porous membrane having a hydrophilic treated first surface and a water-repellent treated second surface, wherein the porous membrane separates a working fluid passage from a vapor passage such that the hydrophilic treated surface faces the working fluid passage and the water-repellent treated surface faces the vapor passage, and a heat pipe provided inside with a wick formed by laminating at least two porous membranes each having a hydrophilic treated first surface and a water-repellent treated second surface such that surfaces subjected to the same treatment face each other and the laminate is wound up.

First claim

The invention claimed is:

1. A heat pipe comprising:
an inside; and
a wick provided in the inside and formed of a porous membrane, the porous membrane having a hydrophilic treated first surface and a water-repellent treated second surface,
wherein the porous membrane separates a working fluid passage from a vapor passage such that the hydrophilic treated surface faces the working fluid passage and the water-repellent treated surface faces the vapor passage, and
wherein at least a portion of the porous membrane is folded once such that the hydrophilic treated surfaces face each other, and then the folded porous membrane is wound.

2. The heat pipe according to claim 1 , wherein the porous membrane is folded multiple times such that surfaces subjected to the same treatment face each other.

3. A heat pipe comprising:
an inside; and
a wick provided in the inside and formed of at least two porous membranes each having a hydrophilic treated first surface and a water-repellent treated second surface,
wherein the at least two porous membranes separate a working fluid passage from a vapor passage such that each of the hydrophilic treated first surfaces face the working fluid passage and each of the water-repellent treated second surfaces face the vapor passage, and
wherein the at least two porous membranes are laminated such that surfaces subjected to the same treatment face each other and then the laminates is wound.

4. A heat pipe comprising:
an inside; and
a wick provided in the inside and formed of a porous membrane, the porous membrane having a hydrophilic treated first surface and a water-repellent treated second surface,
wherein the porous membrane separates a working fluid passage from a vapor passage such that the hydrophilic treated surface faces the working fluid passage and the water-repellent treated surface faces the vapor passage,
wherein at least a portion of the porous membrane is folded so as to include a folded crease that is disposed in parallel to a direction of flow in each of the working fluid passage and the vapor passage.

Assignees

• Toyota Motor Co Ltd

Inventors

• Yamashita Seiji

Classifications

• F28F2245/02

  hydrophilic · CPC title

• F28D15/0233

  the conduits having a particular shape, e.g. non-circular cross-section, annular (F28D15/0241, F28D15/0266 take precedence) · CPC title

• F28D15/046 Primary

  characterised by the material or the construction of the capillary structure · CPC title

• F28F2245/04

  hydrophobic · CPC title