Patent ID: 9140270
Filing Date: 2015-09-22
Classification: F04D

Abstract:
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.