Patent ID: 8813689
Filing Date: 2014-08-26
Classification: F04D

Abstract:
1. Centrifugal fan comprising: a pot-like impeller provided with a blade ring at its circumference, a housing accommodating the impeller, a circumferential wall of said housing, starting from a first circumferential wall region with an arc-like curvature which extends directly along the blade ring, comprises: a partition provided on one of the side walls extending into the pot-shaped impeller and dividing an interior of the impeller into a first suction chamber and a second suction chamber, and wherein the first suction chamber has an intake and the second suction chamber is adjacent to the first circumferential wall region which directly extends along the blade ring, wherein the third circumferential region, starting from the first circumferential region, has an S-curvature towards the outlet region and comprises a sub-region being curved in the same direction as the first circumferential wall region, said sub-region forming a flow baffle element for an air flow returned to the second suction chamber, wherein the outlet region expands in cross-section in the manner of a diffuser in the outlet flow direction, and wherein the third circumferential wall region has a shape oriented towards the interior of the housing in the manner of a tongue at the housing-side start of the outlet region.