COMBINATION AXIAL-FLOW FAN

• US 20090155080A1
• Filed: 06/03/2008
• Published: 06/18/2009
• Est. Priority Date: 12/12/2007
• Status: Abandoned Application

• Current Assignee: Taiwei Fan Technology Co., Ltd.
• Original Assignee: Taiwei Fan Technology Co., Ltd.
• Inventors: Yu, Chien-Chun
• Application Number:
  US12/131,924
• Publication Number:
  US 20090155080A1
• Time in Patent Office: Days
• US Class Current: 416/212.R
• CPC Class Codes: F04D 25/0613 the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
• CPC Class Codes: F04D 29/329 Details of the hub
• CPC Class Codes: F04D 29/34 Blade mountings for axial flow compressors F04D29/322
• CPC Class Codes: F04D 29/646 Mounting or removal of fans

Abstract

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.

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.