Centrifugal fan assembly

Patent metadata

Field	Value
Publication number	US-9140270-B2
Application number	US-201113231993-A
Country	US
Kind code	B2
Filing date	Sep 14, 2011
Priority date	Sep 14, 2011
Publication date	Sep 22, 2015
Grant date	Sep 22, 2015

Abstract

The present invention relates to a centrifugal fan assembly and a HVAC-system, comprising a housing, a blower wheel comprising a plurality of fan blades, the blower wheel being rotatably mounted in the housing and constructed to generate an airflow flowing axially into the blower wheel and radially out from the blower wheel, a guiding vane device including a plurality of guiding vanes, the guiding vane device being coupled to the blower wheel and configured to guide the airflow into the blower wheel.

First claim

The invention claimed is:

1. A centrifugal fan assembly, comprising:
a housing,
a blower wheel comprising a plurality of fan blades,
wherein the blower wheel is rotatably mounted in the housing with respect to an axis of rotation and is constructed to generate an airflow flowing axially into the blower wheel and radially out from the blower wheel, and
a guiding vane device including a plurality of guiding vanes, wherein a guiding vane comprises a straight portion and a curved leading edge portion, wherein the straight portion of the guiding vane extends radially entirely in a straight manner from the axis of rotation of the blower wheel, wherein an angle between the straight portion and the curved leading edge portion is set in a way that incoming airflow goes into the guiding vane in tangent direction, wherein at different distances from the axis of rotation, the angle is determined by the arctangent local axial airflow velocity divided by local rotational velocity,
wherein the guiding vane device is coupled to the axis of rotation and is configured to guide the airflow into the blower wheel.

2. The centrifugal fan assembly of claim 1 ,
wherein the guiding vane device is arranged at an axial end face of the blower wheel.

3. The centrifugal fan assembly of claim 1 ,
wherein at least one of said plurality of guiding vanes comprises an actor, and
wherein the angle of the curved leading edge is adjustable during operation by means of the actor.

4. The centrifugal fan assembly of claim 1 ,
wherein the guiding vane device is formed integrally with the blower wheel, forming a single part.

5. The centrifugal fan assembly of claim 1 ,
wherein the blower wheel comprises a plurality of fan blades that are one of forward-curved, backward-curved, and straight radial.

6. The centrifugal fan assembly of claim 1 ,
wherein the blower wheel is driven by one of a direct drive, a belt drive, a magnetic coupling and a hydraulic coupling.

7. The centrifugal fan assembly of claim 1 ,
wherein a number of said blades comprised by the plurality of fan blades differs from a number of said vanes comprised by the plurality of guiding vanes.

8. The centrifugal fan assembly of claim 1 ,
wherein the number of said plurality of guiding vanes is equal to a half of the number of said plurality of fan blades.

9. The centrifugal fan assembly of claim 1 ,
wherein the blower wheel is an injection molded plastic part.

10. The centrifugal fan of claim 1 ,
wherein the guiding vane device is an injection molded plastic part.

11. An HVAC-System comprising:
a housing,
a centrifugal fan,
a blower wheel comprising a plurality of fan blades,
wherein the blower wheel is rotatably mounted in the housing with respect to an axis of rotation and is constructed to generate an airflow flowing axially into the blower wheel and radially out from the blower wheel, and
a guiding vane device including a plurality of guiding vanes, wherein a guiding vane comprises a straight portion and a curved leading edge portion, wherein the straight portion of the guiding vane extends radially entirely in a straight manner from the axis of rotation of the blower wheel, wherein an angle between the straight portion and the curved leading edge portion is set in a way that incoming airflow goes into the guiding vane in tangent direction, wherein at different distances from the axis of rotation, the angle is determined by arctangent local axial airflow velocity divided by local rotational velocity,
wherein the guiding vane device is coupled to the axis of rotation and is configured to guide the airflow into the blower wheel.

12. A guiding vane device for a centrifugal fan assembly, the centrifugal fan assembly comprising a housing, a centrifugal fan, and a blower wheel comprising a plurality of fan blades, the guiding vane device comprising:
a plurality of guiding vanes, wherein a guiding vane comprises a straight portion and a curved leading edge portion, wherein the straight portion of the guiding vane extends radially entirely in a straight manner from the axis of rotation of the blower wheel, wherein an angle between the straight portion and the curved leading edge portion is set in a way that incoming airflow goes into the guiding vane in a tangent direction, wherein at different distances from the axis of rotation the angle is determined by arctangent local axial airflow velocity divided by local rotational velocity, wherein the guiding vane device is coupled to the axis of rotation and is configured to guide the airflow into the blower wheel.

Assignees

• Hong Tao
• Brose Fahrzeugteile

Inventors

• Hong Tao

Classifications

• F04D17/025

  comprising axial flow and radial flow stages · CPC title

• F04D29/282 Primary

  the leading edge of each vane being substantially parallel to the rotation axis · CPC title

• F04D29/4226

  Fan casings · CPC title

• F04D29/362

  during rotation · CPC title

• F04D29/287

  with adjusting means · CPC title