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Micro-Turbulent Impeller to Reduce Noise Generated by a Fan

IP.com Disclosure Number: IPCOM000103399D
Publication Date: 2005-Mar-17
Document File: 3 page(s) / 231K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that augments the surface finish of the foil and modifies the leading and trailing edges of impeller blades to minimize the sound generated by an electro-mechanical fan. Benefits include increasing air flow without increasing the noise level.

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Micro-Turbulent Impeller to Reduce Noise Generated by a Fan

Disclosed is a method that augments the surface finish of the foil and modifies the leading and trailing edges of impeller blades to minimize the sound generated by an electro-mechanical fan. Benefits include increasing air flow without increasing the noise level.

Background

With increased thermal demands on computer electronics, it is important to explore solutions that decrease the noise generated by the system. Currently, the noise generated by the power supply and CPU fans comprise approximately 75% of a computer’s noise, with the balance attributed to the disk drive. Current specifications call for a decibel level of 55 to address customer concerns. This is particularly important as computers continue to be used as home entertainment equipment.

Currently, to address thermal demands, the size of the three component fans is increased (at the expense of real-estate, cost, and increased noise to the system), and the size of the thermal solution is increased (at the expense real-estate, weight, and cost to the system).

General Description

The disclosed method modifies the leading and trailing edges of impeller blades to minimize the sound generated by an electro-mechanical fan. The modifications to the impeller blades are based on the structure of the owl feather in order to dampen the generation of sound. The following three features are combined on an impeller blade to maintain performance while reducing acoustics:

§         Leading Edge Barb. As shown in Figure 1, the leading edge of a conventional fan impeller blade is smooth, almost sharp. This leads to an air egress in larger turbulence patterns, resulting in acoustic sound. The disclosed method incorporates leading e...