Fan enabling increased air volume

Abstract

A fan enabling increased air volume includes at least a fan wheel and a driving unit for driving the fan wheel to maintain a uniform rotating speed. The fan wheel includes a hub and a plurality of blades radially extended from an outer periphery of the hub. The blades may be arranged on the hub in different manners, such as having a preceding blade overlapped a following blade, or having a blade root installation angle smaller than 53° and a blade tip inclination angle smaller than 46°, or having a solidity of blade roots larger than 1.5 and a solidity of blade tips larger than 1, so that the fan wheel produces increased air volume and accordingly enhanced cooling power at the uniform rotating speed.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a fan enabling increased air volume, and more particularly to a fan with enhanced cooling power. BACKGROUND OF THE INVENTION [0002] With the increasing developments in technological fields, various kinds of electronic products are designed to provide more functions so as to increase their value in use. The increased functions necessitate the provision of more components or parts in a system having a fixed volume. The large quantity of components or parts in the electronic product result in reduced internal spaces of the system while produce more heat in the limited internal spaces of the system to necessitate the use of cooling means to carry away the produced high amount of heat. A cooling fan is most frequently selected to solve the problem of heat produced in the system because it produces convective airflows to carry away the produced heat from the system. However, when the airflows produced by the cooling fan inward...

AI Technical Summary

Benefits of technology

[0007] A primary object of the present invention is to provide a fan wheel having a plurality of blades that may be differently arranged on a hub, so that the blades either overlap one another, or have a blade root installation angle smaller than 53° and a blade tip inclination angle smaller than 46°, or have a solidity of blade roots larger than 1.5 and a solidity of blade tips larger than 1, so that the fan wheel is able to produce increased air volume and enhanced cooling efficiency at a uniform rotating speed.

[0008] Another object of the present invention is to provide a fan wheel that operates at a uniform rotating speed to save power consumption needed to drive the fan wheel.

[0010] In a first embodiment of the present invention, the blades are arranged on the hub with a preceding blade overlapping a following blade. In a second embodiment of the present invention, the blades are arranged on the hub with a blade root installation angle smaller than 53° and a blade tip inclination angle smaller than 46°. In a third embodiment of the present invention, the blades are arranged on the hub with a solidity of blade roots larger than 1.5 and a solidity of blade tips larger than 1. In either case, the fan wheel is able to produce increased air volume and accordingly enhanced cooling power at the uniform rotating speed.

Problems solved by technology

However, when the airflows produced by the cooling fan inward flow through the system, they are inevitably impeded by the components or parts densely arranged in the system to result in largely reduced cooling effect.

However, the increased motor rotating speed would result in consumption of more power and accordingly waste of more energy.

When the fan is started to operate, airflows produced by the fan are interfered in their flow paths by the components in the system.

That is, the impedance of the internal components of the system will prevent the airflows produced by the fan from flowing smoothly to result in loss of air pressure.

When the overlapped blades of the fan are rotated to produce airflows, the airflows are interfered in their flow paths by the components in the system.

That is, the impedance of the internal components of the system will prevent the airflows produced by the overlapped blades of the fan from flowing smoothly to result in loss of air pressure.

However, the motor with increased number of coil would largely increase the power consumption thereof and tends to overheat and burn out due to increased rotating speed.

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