Fan and impeller thereof

Abstract

A fan has an impeller, a motor and a frame. The impeller and the motor are disposed within the frame, and the motor is connected to the impeller and drives the impeller to rotate. The impeller includes a hub and an odd number of blade sets. The blade sets are disposed around the circumference of the hub. Bach blade set has a plurality of the blades, and the blades of each blade set can be the same or not. For example, the blades in each of the blade sets have different tilting angles, heights and / or lengths while the blades are connected with the hub. Or the blades in each of the blade sets have different curvatures, arc lengths, thicknesses, or side-view shapes.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This Non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 096112018, filed in Taiwan, Republic of China on Apr. 4, 2007, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of Invention[0003]The present invention relates to a fan and an impeller thereof, and in particular to a fan and an impeller thereof with an odd number of blade sets.[0004]2. Related Art[0005]As developments of electronic products with good performance, high operating frequencies, fast speeds and compact sizes, lots of heat and thus high temperature are generated that easily results in instability during their operations and affects the reliabilities of the electronic products. Therefore, heat dissipation has become one important issue in the design of electronic devices.[0006]Fan is a commonly used in heat dissipation. FIG, 1 shows a conventional fan 1. The impeller 10 ...

AI Technical Summary

Benefits of technology

[0009]In view of the foregoing, the present invention is to provide a fan and an impeller thereof that can increase the air flow and air pressure without producing resonance effects or sacrificing their lifetime.

[0012]As mentioned above, the fan and impeller of the present invention have the design that several blades are grouped into an odd number of blade sets. Therefore, at the same time of increasing the overall air flow and air pressure of the fan by having more blades, the system is still kept balanced. Compared with the prior art, the present invention is free from the design restriction of having an odd number of blades. It also prevents the resonance phenomena when there are the total blades of even number. Thus, the efficiency of the fan is increased. Moreover, the blades in each blade set can be the same or different, thereby increasing the flexibility in blade designs.

Problems solved by technology

As developments of electronic products with good performance, high operating frequencies, fast speeds and compact sizes, lots of heat and thus high temperature are generated that easily results in instability during their operations and affects the reliabilities of the electronic products.

Therefore, heat dissipation has become one important issue in the design of electronic devices.

Such resonances increase the noises, cause imbalance, and result in fatigue of the bearing and other elements, thereby affecting the overall performance of the fan and lowering its lifetime.

However, due to higher demands in heat dissipation, the performance of the fan I has to increase as well.

Nevertheless, there is a limit in the angle between adjacent blades, which will put a restriction on the blade width.

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