Fan incorporating non-uniform blades

• US 6,719,530 B2
• Filed: 04/02/2002
• Issued: 04/13/2004
• Est. Priority Date: 12/12/2001
• Status: Expired due to Fees

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Chow, Min Chan John
• Primary Examiner(s): Nguyen, Ninh H.
• Application Number:
  US10/115,486
• Publication Number:
  US 20030108427A1
• Time in Patent Office: 742 Days
• Field of Search: 416/203, 415/175
• US Class Current: 416/203
• CPC Class Codes: F04D 29/328 with unequal distribution of blades around the hub
• CPC Class Codes: F04D 29/666 by means of rotor construction or layout, e.g. unequal distribution of blades or vanes

Abstract

A fan (2) includes a central hub (22), and a plurality of spaced and substantially sector-shaped blades (24) radially extending from the central hub. The blades surround the central hub. Shapes of the blades are similar. Sizes of the blades are all different from one another. Spacings between any two adjacent blades are all different from one another. The blades can therefore be configured such that a natural frequency of the blades is outside a range of a working frequency of a corresponding heat dissipation assembly which is used to dissipate heat from a corresponding electronic device. Resonance of the blades can therefore be completely avoided. Noise and vibration of the blades when the fan is operated can therefore be minimized.

Claims

1. A fan for use in a heat dissipation assembly, comprising:

a central hub; and

a plurality of spaced blades radially extending from the central hub, wherein the blades are arranged to be on-uniform thereby rendering a natural frequency of the blades outside a range of a working frequency of the heat dissipation assembly, and wherein the blades and spacings between every adjacent two blades together form a circle and share a same circle center, each of the blades and spacings is a sector of the circle, at least two included angles of the sectors of said blades are different from one another, and at least two included angles of the sectors of said spacings are different from one another.

2. A fan for use with a heat dissipation assembly comprising:

a hub; and

a plurality of blades radially extending from said hub;

wherein

said blades generally define a common radial dimension, the blades and intervals between any two adjacent blades each are sector-shaped which together define a circle, at least two included angles of respective blades are different from each other, while included angles of the intervals are the same with one another.