Patent ID: 11946486
Assignee: ZIEHL-ABEGG SE
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A fan, comprising:
an impeller having backward-curved blades;
a scroll housing and
a flow channel of which is formed by an inner contour of the housing, depicting a spiral contour, the flow channel guiding the air conveyed by the impeller towards an outlet,
wherein an average pitch angle of the spiral contour is more than twice as high in a sector range with an azimuthal angle θ from θ=0° to θ=45°, measured from near or at the tongue of the housing, as in a sector range with an azimuthal angle θ from θ=45° to θ=180°, measured from near or at the tongue.