COMBINATION AXIAL-FLOW FAN
A high-performance low-noise combination axial-flow fan includes a fan hub that has a center connection portion for the connection of a fan motor shaft and a mounting groove extending around the periphery, and fan blades each having a wedge block disposed at the inner end for fastening to the mounting groove to secure the respective fan blade to the fan hub in such a manner that no gap is seen between each two adjacent fan blades when viewed from the front side.
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(a) Field of the Invention
The present invention relates to a fan and, more particularly, to a combination axial-flow fan for use in an electronic product for forced air convection cooling.
(b) Description of the Prior Art
Regular cooler modules are designed for use in electronic and photoelectric products to expel waste heat. A typical conventional cooler module is comprised of a passive heat dissipation device and an active heat dissipation device. A passive heat dissipation device can be a heat sink extruded from copper or aluminum and having multiple radiation fins. An active heat dissipation device can be an axial-flow fan that forces surrounding air to cause convection, thereby lowering the surrounding temperature. A typical conventional axial-flow fan comprises a fan hub 10 and multiple blades 20 integrated into and extending around the periphery of the fan hub 10 (see
The present invention has been accomplished under the circumstances in view. It is therefore one object of the present invention to provide a combination axial-flow fan, which has the fan hub and the fan blades separately made and then assembled together so that the front edge of one fan blade is suspended above the rear edge of another fan blade, no gap is seen between each two adjacent fan blades when viewed from the front side, and has high wind pressure, high wind capacity, and low noise level characteristics.
To achieve this and other objects of the present invention, the combination axial-flow fan comprises a fan hub and a set of fan blades. The fan hub and the fan blades are separately made and then assembled together. The fan hub comprises a center connection portion for the connection of a fan motor shaft, and a mounting groove extending around the periphery. The mounting groove is an endless groove extending around the periphery of the fan hub near the front side of the fan hub, having an open side that extends in direction toward the rear side of the fan hub. Each fan blade comprises a wedge block disposed at the inner end. The wedge block has a top protruding engaged into the mounting groove of the fan hub, and a bottom locating groove for the mounting of a retaining ring to secure the fan blades to the periphery of the fan hub. Further, the fan hub comprises a set of positioning teeth arranged around the periphery, and the wedge block of each fan blade comprises a set of positioning teeth for engagement with the positioning teeth of the fan hub. Further, the wedge block of each fan blade comprises a retaining flange disposed at one lateral side and a retaining groove disposed at the other lateral side. By means of engaging the retaining flange of the wedge block of one fan blade into the retaining groove of the wedge block of another fan blade, the fan blades are thus fastened together.
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Because the fan hub 1 and the fan blades 2 are separately molded from plastics and then assembled together, fan blades having different 3D camber and geometric shape features can be selectively used with one same fan hub to constitute different combination axial-flow fans for different applications to satisfy different cooling requirements, thereby lowering the mold cost.
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Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims
1. A combination axial-flow fan, comprising:
- a fan hub, said fan hub comprising a center connection portion for the connection of a fan motor shaft and a mounting groove extending around the periphery thereof; and
- a plurality of fan blades, each said fan blade comprising a wedge block disposed at an inner end thereof for fastening to said mounting groove to secure the respective fan blade to said fan hub.
2. The combination axial-flow fan as claimed in claim 1, wherein said mounting groove is a continuous groove extending all around the periphery of said fan hub near a front side of said fan hub, having an open side extending in a direction toward a rear side of said fan hub; and
- the wedge block of each said fan blade is smoothly arched to fit the periphery of said fan hub, having a top protrusion for engagement into said mounting groove of said fan hub and a bottom locating groove for mounting a retaining ring to secure said fan blades to the periphery of said fan hub.
3. The combination axial-flow fan as claimed in claim 2, wherein said fan hub comprises a set of positioning teeth arranged around the periphery thereof; and
- the wedge block of each said fan blade comprises a set of positioning teeth for engagement with the positioning teeth of said fan hub.
4. The combination axial-flow fan as claimed in claim 2, wherein the wedge block of each said fan blade comprises a retaining flange disposed at one lateral side thereof and a retaining groove disposed at an opposite lateral side thereof, the retaining flange of the wedge block of one said fan blade being engaged with the retaining groove of the wedge block of an adjacent said fan blade.
5. The combination axial-flow fan as claimed in claim 4, wherein said retaining groove of each said wedge block has an expanded portion, and said retaining flange of each said wedge block has an expanded distal end fitting the expanded portion of said retaining groove.
Type: Application
Filed: Jun 3, 2008
Publication Date: Jun 18, 2009
Applicant: TAIWEI FAN TECHNOLOGY CO., LTD. (Sinjhuang City)
Inventor: Chien-Chun Yu (Shulin City)
Application Number: 12/131,924
International Classification: B63H 1/20 (20060101);