Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Vane or deflector
Reexamination Certificate
1998-12-02
2001-01-30
Lopez, F. Daniel (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Vane or deflector
C415S175000, C415S177000, C415S208300, C415S211100, C361S689000, C361S688000, C361S694000, C361S695000
Reexamination Certificate
active
06179561
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to fan wheel structures, and more particularly to fan wheel structures having axial blades and blower blades.
2. Description of the Related Art
A wide variety of fan wheels for miniature heat dissipating fans have heretofore been provided. Conventional fan wheels include two types: axial type and blower type. An axial type fan wheel includes axial blades each extended in a direction that has an angle with an axial direction for driving air along the axial direction. A blower type fan wheel includes blower blades each extended in a direction parallel to the axial direction for driving air in a plane perpendicular to the axial direction. When using a miniature heat dissipating fan with axial blades for cooling a circuit board or the like, cool air is accumulated on the surface of the circuit board and then forced to expand outward along a plane perpendicular to the axial direction. In this case, hot air as a result of absorbing heat generated by the circuit board will move upwardly and thus causes an obstruct to the outward expansion of the cool air. As a result, the heat dissipating function is adversely affected. When using a miniature heat dissipating fan with blower blades for cooling a circuit board or the like, cool air is driven along the plane perpendicular to the axial direction. In this case, hot air as a result of absorbing heat generated by the circuit board that moves upwardly is also driven along the plane perpendicular to the axial direction. The upwardly moving hot air encounters and thus adversely affects the cooling effect of cool air that moves downwardly to the surface of the circuit board.
The present invention is intended to provide improved fan wheels for miniature heat dissipating fans to solve the above problems.
SUMMARY OF THE DRAWINGS
It is a primary object of the present invention to provide an improved fan wheel for miniature heat dissipating fans; the fan wheel may simultaneously drive air along an axial direction and a plane perpendicular to the axial direction, thereby providing a better heat dissipating effect.
A fan wheel in accordance with the present invention includes a main body and an axle connected to a center of the main body. The main body includes a peripheral wall provided around an axial axis thereof. A number of upper blades and lower blades are mounted to the peripheral wall. Each upper blade extends in a direction at an angle with the axial axis, while each lower blade extends in a direction substantially parallel to the axial axis. When the main body rotates, the axial blades drive air along the axial axis, and the blower blades drive air along a plane perpendicular to the axial axis.
Each upper blade may be connected to or separate from an associated lower blade. The upper blades and the lower blades may be alternately disposed. Preferably, each upper blade is arcuate.
In a preferred embodiment of the invention, the upper blades are located below an air inlet of a heat dissipating device, while the lower blades are located adjacent to an air outlet of the heat dissipating device. In operation, the upper blades drive ambient cool air along an axial axis via the air inlet to a place adjacent to the lower blades. Then, the lower blades drive air along a plane perpendicular to the axial axis to exit the air outlet, thereby providing a better convection effect for heat dissipation.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5513951 (1996-05-01), Komoda et al.
patent: 5699854 (1997-12-01), Hong
patent: 5816319 (1998-10-01), Kamekawa et al.
patent: 5879141 (1999-03-01), Yokozawa et al.
patent: 5979541 (1999-11-01), Saito
patent: 324798 (1998-02-01), None
U.S. application No. 09/213,891, filed Dec. 17, 1998.
Applicant's comments on Taiwan Publication No. 324798.
Lopez F. Daniel
McAleenan James M
Stevens Davis Miller & Mosher L.L.P.
Sunonwealth Electric Machine Industry Co. Ltd.
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