Fan impeller blade

Patent metadata

Field	Value
Publication number	US-9765793-B2
Application number	US-201414318906-A
Country	US
Kind code	B2
Filing date	Jun 30, 2014
Priority date	Jun 30, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A centrifugal fan impeller includes a front endring, a rear endring, and a plurality of blades coupled between the front and the rear endrings. At least one blade of the plurality of blades includes a blade span extending between the front endring and the rear endring, a leading edge, and a trailing edge. The at least one blade further includes a first elliptical cross-sectional profile extending between the leading and the trailing edges.

First claim

What is claimed is:

1. A centrifugal fan impeller comprising:
a front endring;
a rear endring; and
a plurality of blades coupled between said front endring and said rear endring, at least one of said plurality of blades comprising:
a blade span extending between said front endring and said rear endring;
a leading edge;
a trailing edge;
a first elliptical cross-sectional profile extending between said leading edge and said trailing edge at a first point along said blade span; and
a second elliptical cross-sectional profile at a second point along said blade span, wherein said first elliptical cross-sectional profile is a first portion of an ellipse and said second elliptical cross-sectional profile is a second portion of the ellipse that is different from the ellipse first portion.

2. The centrifugal fan impeller in accordance with claim 1 , wherein said first elliptical cross-sectional profile is constant along said blade span.

3. The centrifugal fan impeller in accordance with claim 1 , wherein said first elliptical cross-sectional profile defines a first exit angle and said second elliptical cross-sectional profile defines a second exit angle different than the first exit angle.

4. The centrifugal fan impeller in accordance with claim 1 , wherein said first elliptical cross-sectional profile defines an airflow exit angle that changes along said blade span.

5. The centrifugal fan impeller in accordance with claim 1 , wherein said leading edge and said trailing edge are aligned with vertices of an ellipse that define said first elliptical cross-sectional profile.

6. A fan blade comprising:
a blade span;
a leading edge;
a trailing edge;
a first elliptical cross-sectional profile extending between said leading and said trailing edge at a first point along said blade span, wherein said first elliptical cross-sectional profile is a portion of an ellipse defined by a first focus and a second focus; and
a second elliptical cross-sectional profile positioned at a second point along said blade span, wherein said first elliptical cross-sectional profile is a first portion of an ellipse and said second elliptical cross-sectional profile is a second portion of the ellipse that is different from the first portion.

7. The fan blade in accordance with claim 6 , wherein said first elliptical cross-sectional profile is constant along said blade span.

8. The fan blade in accordance with claim 6 , wherein said first elliptical cross-sectional profile defines an airflow exit angle that changes along said blade span.

9. The fan blade in accordance with claim 6 further comprising a suction side, a pressure side, and a boundary layer trip device coupled to at least one of said suction side and said pressure side.

10. A fan blade comprising:
a blade span;
a first elliptical cross-sectional profile defining a chord length at a first point along said blade span, wherein said first elliptical cross-sectional profile is a portion of an ellipse defined by a first focus and a second focus;
a second elliptical cross-sectional profile positioned at a second point along said blade span, wherein said first elliptical cross-sectional profile is a first portion of an ellipse and said second elliptical cross-sectional profile is a second portion of the ellipse that is different from the first portion;
a suction side;
a pressure side; and
a boundary layer trip device coupled to at least one of said suction side and said pressure side, wherein said boundary layer trip device is configured to maintain attachment of a boundary layer to a respective suction side or pressure side.

11. The fan blade in accordance with claim 10 , wherein said boundary layer trip device comprises a leading edge and a trailing edge, wherein at least one of said leading edge and said trailing edge is V-shaped.

12. The fan blade in accordance with claim 10 , wherein said boundary layer trip device is selected from the group comprising adhesive tape, a plurality of dimples formed in said fan blade, and a three-dimensional vortex generator.

13. The fan blade in accordance with claim 10 , wherein said boundary layer trip device is coupled to at least one of said suction side and said pressure side at a predetermined location based on at least one of a thickness of the boundary layer and a thickness of said boundary layer trip device.

14. The fan blade in accordance with claim 10 , wherein said boundary layer trip device includes a thickness based on a thickness of said boundary layer.

Assignees

• Regal Beloit America Inc

Inventors

• Cocks Rachele B
• Rohoza Rafal Pawel

Classifications

• F04D17/04

  of transverse-flow type · CPC title

• F04D29/283 Primary

  rotors of the squirrel-cage type · CPC title

• F04D29/30

  Vanes · CPC title

• F05D2250/70

  Shape · CPC title