Centrifugal fan with low noise

• US 20070160458A1
• Filed: 01/06/2006
• Published: 07/12/2007
• Est. Priority Date: 01/06/2006
• Status: Abandoned Application

• Current Assignee: Jun-Chien Yen
• Original Assignee: Jun-Chien Yen
• Inventors: Yen, Jun-Chien
• Application Number:
  US11/326,363
• Publication Number:
  US 20070160458A1
• Time in Patent Office: Days
• US Class Current: 415/119
• CPC Class Codes: F04D 29/663 Sound attenuation

Abstract

A centrifugal fan with low noise includes a housing, a fan wheel and a recess unit. The fan wheel has a hub and a plurality of fan blade extending outward from the hub radially. The housing has a chamber therein to receive the fan wheel and has a recess unit at the surface thereof. The recess unit is composed of a projection part and a recess part for reducing noise transmission greatly.

Claims

1. A centrifugal fan with low noise, comprising:

a housing, providing a chamber therein; and

a fan wheel, being received in the chamber;

characterized in that the housing has a recess unit at the surface thereof for reducing noise.

2. The centrifugal fan with low noise as defined in claim 1, wherein the recess unit is composed of at least a projection part and a recess part.

3. The centrifugal fan with low noise as defined in claim 2, wherein the projection part and the recess part is formed with a grid shape.

4. The centrifugal fan with low noise as defined in claim 2, wherein the projection part and the recess part is formed with a parallel shape.

5. The centrifugal fan with low noise as defined in claim 1, wherein the housing has at least an outlet communicating with the chamber.

6. The centrifugal fan with low noise as defined in claim 1, wherein the surface refers to the outer surface and/or the inner surface of the housing.

7. The centrifugal fan with low noise as defined in claim 1, wherein the fan wheel has a hub and a plurality of fan blades extending outward from the hub radially.

8. The centrifugal fan with low noise as defined in claim 1, wherein the housing is integrally made with the recess unit as a single piece.

9. The centrifugal fan with low noise as defined in claim 1, wherein the housing is made as an individual piece from the recess unit.