Fan enabling increased air volume
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.
The present invention relates to a fan enabling increased air volume, and more particularly to a fan with enhanced cooling power.
BACKGROUND OF THE INVENTIONWith 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 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. Therefore, it is necessary to increase the air volume and air pressure produced by the cooling fan to maintain the expected cooling effect. Currently, there are two ways to achieve this purpose. The first way is to increase the rotating speed of the motor of the fan, and the second way is to change the blade structure of the fan. However, the increased motor rotating speed would result in consumption of more power and accordingly waste of more energy.
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It is therefore tried by the inventor to develop a fan enabling increased air volume that increases air pressure and volume without the need of increasing the power for drive the fan.
SUMMARY OF THE INVENTIONA 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.
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.
To achieve the above and other objects, the fan enabling increased air volume according to the present invention 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.
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.
BRIEF DESCRIPTION OF THE DRAWINGSThe structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
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To assemble the fan of the present invention, first firmly fix the rotor 233 in the hub 221 of the fan wheel 22, and then sequentially position the retaining ring 26 and the bearing 25 in the bushing 212, and then put the driving circuit board 231 and the stator 232 around the bushing 212. Thereafter, extend the spindle 2211 of the fan wheel 22 through the bearing 25 with the retaining ring 26 engaged with the neck portion 22111 of the spindle 2211, so that the spindle 2211 is rotatably connected to the bushing 212 without the risk of separating from the bushing 212. Finally, connect the driving circuit board 231 to the stator 232, which is magnetically connected to the rotor 233, so that the stator 232 and the rotor 233 are excited when the driving circuit board 231 produces currents. In this manner, the fan wheel 22 could rotate at a uniform speed as soon as it is started, and produces airflows.
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FIGS. 13 to 16 are spread-out views of a fan wheel 42 for a fan according to a third preferred embodiment of the present invention, wherein
The present invention has been described with some preferred embodiments thereof and it is understood that many changes and modifications in the described embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.
Claims
1. A fan enabling increased air volume, comprising at least a fan wheel, and a driving unit for driving said fan wheel to maintain a uniform rotating speed; said fan wheel including a hub and a plurality of blades radially extended from an outer periphery of said hub, and each of said blades in a preceding position overlapping another blade immediately following said preceding blade, so that said fan wheel produces increased air volume and accordingly enhanced cooling power at said uniform rotating speed.
2. The fan enabling increased air volume as claimed in claim 1, wherein said a plurality of blades overlap one another in such a manner that a blade root and a blade body of said preceding blade overlap a blade root and a blade body of said following blade.
3. The fan enabling increased air volume as claimed in claim 1, wherein said a plurality of blades overlap one another in such a manner that a blade root of said preceding blade overlaps a blade root of said following blade.
4. The fan enabling increased air volume as claimed in claim 1, wherein said a plurality of blades overlap one another in such a manner that a blade body of said preceding blade overlaps a blade body of said following blade.
5. The fan enabling increased air volume as claimed in claim 1, further comprising a housing in which said fan wheel and said driving unit are mounted.
6. The fan enabling increased air volume as claimed in claim 1, wherein said driving unit includes a driving circuit board.
7. The fan enabling increased air volume as claimed in claim 1, wherein said uniform rotating speed of said fan wheel has a deviation within a range of ±8%.
8. A fan enabling increased air volume, comprising at least a fan wheel, and a driving unit for driving said fan wheel to maintain a uniform rotating speed; said fan wheel including a hub and a plurality of blades radially extended from an outer periphery of said hub, and a blade root of each of said a plurality of blades has an installation angle smaller than 53°, and a blade tip of each of said a plurality of blades has an inclination angle smaller than 46°, so that said fan wheel produces increased air volume and accordingly enhanced cooling power at said uniform rotating speed.
9. The fan enabling increased air volume as claimed in claim 8, wherein said driving unit includes a driving circuit board.
10. The fan enabling increased air volume as claimed in claim 8, further comprising a housing in which said fan wheel and said driving unit are mounted.
11. The fan enabling increased air volume as claimed in claim 8, wherein said uniform rotating speed of said fan wheel has a deviation within a range of ±8%.
12. A fan enabling increased air volume, comprising at least a fan wheel, and a driving unit for driving said fan wheel to maintain a uniform rotating speed; said fan wheel including a hub and a plurality of blades radially extended from an outer periphery of said hub, and said a plurality of blades have a solidity of blade roots larger than 1.5, and a solidity of blade tips larger than 1, so that said fan wheel produces increased air volume and accordingly enhanced cooling power at said uniform rotating speed.
13. The fan enabling increased air volume as claimed in claim 12, wherein said driving unit includes a driving circuit board.
14. The fan enabling increased air volume as claimed in claim 12, further comprising a housing in which said fan wheel and said driving unit are mounted.
15. The fan enabling increased air volume as claimed in claim 12, wherein said uniform rotating speed of said fan wheel has a deviation within a range of ±8%.
Type: Application
Filed: Jun 9, 2004
Publication Date: Dec 15, 2005
Inventor: Wen-Hao Liu (Taipei Hsien)
Application Number: 10/863,337