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Method for a design approach for a two-piece axial fan with overlapping blades

IP.com Disclosure Number: IPCOM000008474D
Publication Date: 2002-Jun-17
Document File: 9 page(s) / 305K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a design approach for a two-piece axial fan with overlapping blades. Benefits include improved performance, improved throughput, and improved reliability.

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Method for a design approach for a two-piece axial fan with overlapping blades

Disclosed is a method for a design approach for a two-piece axial fan with overlapping blades. Benefits include improved performance, improved throughput, and improved reliability.

Background

      Existing fan impellers do not typically have overlapping fan blades. As a result, blades do not support a high backpressure at high airflow due to air escaping between the openings between the blades.

      With overlapping fan blades, the tooling complexity and cost increase significantly with extensive mechanical action, such as slides and lifts.  Tooling with the intensive mechanical action is not robust due to potential thin steel conditions where the slides meet each other.

              Blade thickness is based on the strength of the steel and the pressures required for filling the part using thin wall molding techniques.

      Conventional solutions include (see Figure 1):

·        Axial fan impellers with blades that do not overlap and draw in one direction only

·        Impellers with complex tooling actions that must be manufactured at state-of-the-art facilities

Description

              The disclosed method is a two-piece axial fan impeller that enables the blades to overlap each other. The blades alternate between the two pieces of the impeller, greatly simplifying the tooling and manufacturability. This design enhances the pressure air-flow characteristics of the fan and enables higher airflow through high-impedance heatsinks and computer chassis.

              The key elements of the method include:

·        An inner hub with nonoverlapping blades

·        An outer hub with nonoverlapping blades

·        Attachment features on the hubs that align the blades of the two hubs to overlap

·        Attachment features that lock the hubs and blades together in an optimal alignment

 


Advantages

              The disclosed method provides advantages, including:

·        Improved design freedom for constructing geometry t...