Heat sink

Abstract

A heat sink including a main body and a plurality of porous structures is disclosed. The main body has a plurality of hollow fins and a base. The fins and the base form a closed room. The porous structures are set on the interior surfaces of different fins, and are connected to the base. Each porous structure defines a vapor chamber.

Description

BACKGROUND OF THE INVETION [0001] a) Field of the Invention [0002] The invention relates to a heat sink and, more particularly, to a heat sink that is able to dissipate heat quickly and efficiently. [0003] b) Description of the Prior Art [0004] With the advancement of electronic technology, the electronic components are miniaturized and densely packaged. However, this correspondingly produces more heat, and therefore relying on natural or forced convection is insufficient to remove heat. [0005] The conventional method of removing heat generated from electronic components is to conduct the heat from a heat source to a heat sink and then to dissipate the heat to the surroundings through natural or forced convection to the fins of the heat sink. However, the conventional heat sinks with fins have some problems that do affect the efficiency of heat removal. For instance, a deficiency in temperature gradient due to the temperature difference between the fin surfaces and the heat sink air...

AI Technical Summary

Benefits of technology

[0011] An object of the invention is to provide a heat sink with high heat dissipation efficiency under high heat loadings.

[0012] Another object of the invention is to provide a heat sink with high heat dissipation efficiency when installed in any direction.

[0013] Yet another object of the invention is to provide a heat sink which prevents dry outs and hot spots from occurring.

[0020] Moreover, since the bottom of the small vapor chambers and / or small sectors are composed of connecting wicks (heat-absorptive portion), the working fluid in each small vapor chamber are in fluid communication, and thus the possibility of hot spots occurring is lowered, and the heat is evenly distributed to each small vapor chamber and / or small sector.

[0022] The vapor chamber in the heat sink according to the invention is composed of a plurality of small vapor chambers and / or small sectors, and therefore the return-flow path of the working fluid is short, and the return-flow speed and heat dissipation efficiency are enhanced.

Problems solved by technology

However, this correspondingly produces more heat, and therefore relying on natural or forced convection is insufficient to remove heat.

However, the conventional heat sinks with fins have some problems that do affect the efficiency of heat removal.

For instance, a deficiency in temperature gradient due to the temperature difference between the fin surfaces and the heat sink airflow being only 5-10 degrees Celsius; the heat resistance problems due to the material and structure of the heat sink and low fin efficiency that is less than 70%.

These problems are the root causes for the conventional heat sinks not able to increase its' heat dissipation efficiency and further unable to remove the heat produced by electronic components sufficiently.

Nonetheless, the path for the working fluid to return to the chamber is long.

In addition, the single phase state (only vapor) in the heat conductive mechanism and the long return path can make the fins except the outmost fins ineffective.

Under this condition, the effective dissipating surface is greatly reduced and hence lowers the effectiveness of the heat sink.

Since gravity is the return-flow mechanism used in this application, direction problems do exist.

That is, when the installation direction of the heat sink changes, the return-flow mechanism becomes inoperable.

However, this technology did not solve the problem that exists in the U.S. Pat. No. 6,490,160, where the dry out occurs and all but the outmost hollow fins are inoperable under a high heat-loading condition, which lowers the dissipation efficiency.

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