Patent ID: 8142147
Filing Date: 2012-03-27
Classification: F04D

Abstract:
1. A centrifugal blower assembly comprising: a centrifugal impeller adapted to receive air axially and discharge the same radially throughout an outer periphery; an electric motor connected in driving relationship with the impeller; a scroll diffuser defining a single axial inlet opening for supplying air to the impeller, and at least one scroll section for collecting and discharging air from the impeller, and at least one partition extending substantially in a radial plane mounted within the scroll section with an inner opening having an edge in close proximity to the periphery of the centrifugal impeller, said partition serving to divide the scroll section into at least two discrete axially separated flows for the discharge of air from the scroll section, each through a single discharge opening, said scroll section comprising at least two discrete scroll sub-sections associated respectively with said at least two axially separated flows, and each of said at least two scroll sub-sections being configured to provide different and independently optimized expansion angles.