Vapor chamber

Patent metadata

Field	Value
Publication number	US-10514211-B2
Application number	US-201514592506-A
Country	US
Kind code	B2
Filing date	Jan 8, 2015
Priority date	Jan 10, 2014
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A vapor chamber having improved heat transfer capacity by efficiently returning the working fluid to the evaporating portion is provided. A hollow flat container 2 is formed by a base member 4 and a lid 3 closing an opening of the base member. Phase-changeable working fluid is held in the container, and fins 9 are arranged in the container to transmit heat of a heat generating object between the bottom plate of the base member and the lid. The fins are densely juxtaposed on an evaporating portion in comparison with the other fins juxtaposed on the outside of the evaporating portion.

First claim

What is claimed is:

1. A vapor chamber, comprising:
a hollow flat container having a base member and a lid closing an opening of the base member;
a working fluid that is encapsulated in the container to transmit heat of a heat generating object, and that is evaporated by being heated and condensed by removing heat therefrom;
a plurality of fins juxtaposed on any one of an inner face of a bottom plate of the base member and an inner face of the lid; and
a sintered porous layer formed between the plurality of fins on any one of the inner face of the bottom plate of the base member and the inner face of the lid to which the heat generating object is contacted;
wherein a portion of any one of the inner face of the bottom plate of the base member and the inner face of the lid to which the heat generating object is contacted serves as an evaporating portion;
wherein any one of the bottom plate and the lid that is not brought into contact to the heat generating object serves as a heat radiating plate;
wherein the plurality of fins include first fins juxtaposed within the evaporating portion and second fins juxtaposed around the evaporating portion,
wherein a density per unit area of the first fins juxtaposed within the evaporating portion is higher than a density per unit area of the second fins juxtaposed around the evaporating portion;
wherein leading end portions of the first fins juxtaposed within the evaporating portion and the second fins juxtaposed around the evaporating portion are brought into contact with the inner face of the heat radiating plate to exchange heat therebetween;
wherein the sintered porous layer is formed between the second fins juxtaposed around the evaporating portion, and
wherein the sintered porous layer is only formed between the second fins juxtaposed around the evaporating portion.

2. The vapor chamber as claimed in claim 1 , wherein the plurality of fins are formed by skiving any of the inner face of the bottom plate of the base member and the inner face of the lid.

3. The vapor chamber as claimed in claim 1 , wherein a space is disposed above the sintered porous layer between the second fins juxtaposed around the evaporating portion, in which vapor of the working fluid migrates.

4. The vapor chamber as claimed in claim 1 , wherein intervals between the second fins juxtaposed around the evaporating portion are within a range of 0.1 mm to 0.3 mm.

5. The vapor chamber as claimed in claim 1 , wherein the plurality of fins comprise three rows of fin arrays.

6. The vapor chamber as claimed in claim 5 , wherein each fin array comprises seven fins.

Assignees

• Fujikura Ltd

Inventors

• Saito Yuji
• PHAN Thanhlong
• Mochizuki Masataka

Classifications

• F28F2215/04

  Assemblies of fins having different features, e.g. with different fin densities · CPC title

• F28D15/046

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

• F28F3/048 Primary

  in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels · CPC title

• F28D15/04

  with tubes having a capillary structure · CPC title