Heat dissipation module with noise reduction

Abstract

A dissipation device has a dissipation fin set and a centrifugal fan. The centrifugal fan outputs airflow toward the dissipation fin set to remove the heat from it. The centrifugal fan includes a centrifugal impeller mounted on a motor. An outer housing houses the motor and the centrifugal impeller. An inner wall of the housing's outlet has hair structure to reduce noise. The dissipation fin set includes a fin structure closely attached to a heat source, as well as an airflow channel housing. The airflow channel also includes a hair structure for reducing noise.

Description

RELATED APPLICATIONS [0001] The present application is based on, and claims priority from, Taiwan Application Serial Number 93115561, filed May 31, 2004, the disclosure of which is hereby incorporated by reference herein in its entirety. BACKGROUND [0002] 1. Field of Invention [0003] The present invention relates to a heat dissipation module. More particularly, the present invention relates to a heat dissipation module with a noise reduction function. [0004] 2. Description of Related Art [0005] As a notebook PC becomes thinner, there isn't enough space for heat convection and heat dissipation design inside the case housing of the notebook PC. When it comes to high-frequency components, such as the CPU (central processing unit) and graphics processing chip, the heat dissipation design hits a bottleneck. Thus, the mainstream framework of heat dissipation design is forced heat convection caused by a centrifugal fan. [0006]FIG. 1 illustrates a perspective view of a conventional centrifu...

AI Technical Summary

Benefits of technology

[0008] It is therefore an objective of the present invention to provide a heat dissipation module with a noise reduction function so as to reduce noise caused by strong airflow.

[0009] In accordance with the foregoing and other objectives of the present invention, a dissipation device includes a dissipation fin set and a centrifugal fan. The centrifugal fan outputs airflow toward the dissipation fin set to remove the heat from it. The centrifugal fan includes a centrifugal impeller mounted on a motor. An outer housing houses the motor and the centrifugal impeller. An inner wall of the housing's outlet has a hair structure to reduce noise. The dissipation fin set includes a fin structure closely attached to a heat source, as well as an airflow channel housing. The airflow channel also includes a hair structure for reducing noise.

[0010] Thus, the dissipation module with noise reduction not only decreases noise amplitudes, but also stabilizes the wake flow. Namely, the airflow with widespread Haystack noise will make a listener feel more comfortable.

Problems solved by technology

As a notebook PC becomes thinner, there isn't enough space for heat convection and heat dissipation design inside the case housing of the notebook PC.

When it comes to high-frequency components, such as the CPU (central processing unit) and graphics processing chip, the heat dissipation design hits a bottleneck.

On the other hand, air driven by the centrifugal impeller 103 flows through the spiral-shaped flow channel and generates a wake flow and a vortex, which create high-frequency and narrow-band noise.

Thus, a notebook PC manufacturer faces a challenge between noise and heat dissipation efficiency.

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