Impeller

Abstract

An impeller includes a plurality of portions, a plurality of bends, and a plurality of blades. A substantial thickness of a portion is smaller than a substantial thickness of another portion more adjacent to a central axis of the impeller. Each bend is interconnected between two portions adjacent to each other. The blades are formed on the portion most distant to the central axis. The overall weight of the impeller is reduced. Furthermore, the impeller has improved mass uniformity and hence improved overall balancing precision.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an impeller and, more particularly, the present invention relates to an impeller including a plurality of portions formed by injection molding in which a substantial thickness of a portion is smaller than a substantial thickness of another portion more adjacent to a central axis of the impeller to improve the balancing precision of the impeller.[0003]2. Description of Related Art[0004]The temperature results from operation of electronic devices becomes higher and higher while the effects of the electronic devices are enhanced. An excessively high temperature environment adversely affects the effects and stability of the electronic devices. Heat-dissipating units have, therefore, become one of the necessities of current electronic devices. Heat-dissipating devices generally include heat-dissipating fans having sizes matching with the volumes of the electronic elements in the electronic de...

AI Technical Summary

Benefits of technology

[0008]Another object of the present invention is to provide a novel impeller that has improved balancing precision.

[0009]A further object of the present invention is to provide a novel impeller that can easily be manufactured.SUMMARY OF THE INVENTION

[0011]The impeller having such a structure can be formed at a smaller injection pressure to avoid deformation of the product. The smaller injection pressure maintains the quality stability of the products while avoiding the waste of materials. Even the areas in the mold cavity distant to the inlet port can be uniformly filled at the smaller injection pressure. The overall weight of the impeller is reduced. Furthermore, the impeller has improved mass uniformity and hence improved overall balancing precision.

Problems solved by technology

An excessively high temperature environment adversely affects the effects and stability of the electronic devices.

Thus, it is difficult to fill the molten plastic material into the mold cavity in a uniform manner, particularly in the areas distant to the inlet port.

As a result, the mass uniformity of the portions of the impeller such as the annular plate or the blades distant to the central axis of the impeller is poor.

Particularly, non-uniform distribution of the molten plastic material in the mold cavity tends to occur in the areas behind the bends in the mold cavity.

As a result, required mass uniformity throughout various portions of the impeller can not be obtained, leading to reduced overall balancing precision.

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