Heat dissipation fan

Abstract

An exemplary heat dissipation fan includes a fan housing 10, a bearing assembly 20, a stator 30 and a rotor 40. The fan housing includes a base 12 and a central tube 14 extending upwardly from the base. The bearing assembly includes a bearing 23 received in the central tube, a porous wick element 24 and a locking washer 25. The stator is mounted around the central tube. The rotor includes a shaft 47 extending through a bearing hole 231 of the bearing. The locking washer is mounted around the shaft and fixed on a top end of the central tube. The locking washer, the bearing and the shaft cooperatively form an oil reservoir 50 in the top end of the central tube. The porous wick element is received in the oil reservoir and physically contacts with the bearing.

Description

BACKGROUND [0001]1. Technical Field[0002]The present invention relates to a heat dissipation fan, and more particularly relates to a heat dissipation fan which has a good lubricating effect.[0003]2. Description of Related Art[0004]With the continuing development of the electronic technology, electronic packages such as CPUs (central processing units) are generating more and more heat that is required to be dissipated immediately. Heat dissipation fans are commonly used in combination with heat sinks for cooling CPUs. Performances of heat dissipation fans mostly depend on performances of bearings used in the heat dissipation fans. Good lubricating qualities of the bearings increase the life-span of the bearings.[0005]A typical heat dissipation fan comprises a fan housing having a central tube extending upwardly therefrom, a bearing received in the central tube, a stator mounted around the central tube, and a rotor rotatable with respect to the stator. The rotor includes a hub and a s...

AI Technical Summary

Benefits of technology

[0005]A typical heat dissipation fan comprises a fan housing having a central tube extending upwardly therefrom, a bearing received in the central tube, a stator mounted around the central tube, and a rotor rotatable with respect to the stator. The rotor includes a hub and a shaft extending from the hub into the bearing. The central tube has an opening defined at a top end thereof. The bearing is inserted into the central tube through the opening. Lubricating oil is injected into the central tube to lubricate the bearing and the shaft. A lubricating effect of the bearing and the shaft can be properly maintained when the heat dissipation fan is vertically mounted. However, when the heat dissipation fan is mounted in an upside-down manner, the lubricating oil will leak out of the central tube through the opening of the central tube and the amount of the lubricating oil in the bearing is thus gradually reduced. The friction between the shaft and the bearing is therefore increased due to a decrease of the lubricating oil, which results in uncomfortable noise or malfunction being generated. As a result, the performance of the heat dissipation fan deteriorates, and the life-span of the fan is accordingly shortened.

Problems solved by technology

The friction between the shaft and the bearing is therefore increased due to a decrease of the lubricating oil, which results in uncomfortable noise or malfunction being generated.

As a result, the performance of the heat dissipation fan deteriorates, and the life-span of the fan is accordingly shortened.

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