F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
F04D 1/00 (2006.01) F04D 17/08 (2006.01) F04D 29/42 (2006.01)
Patent
CA 2152217
A centrifugal fan includes a housing that defines an air inlet leading to an air chamber defined within the fan impeller and an air exit port coupled to an air passageway. The housing includes a shroud that defines a two zone air passageway in the housing. The first zone, commencing adjacent to the base of the exhaust port, is a conformal portion that is conformal to the exterior diameter of the centrifugal fan and spaced slightly apart therefrom. The second zone of the shroud is a scroll portion wherein the angle of expansion is capable of expanding between 10° and 15°. An air restrictor plate is supported inside the air chamber of the centrifugal fan. At ` the greatest width of the air restrictor plate, the air restrictor plate subtends an arc that is substantially coextensive with the arc subtended by the first conformal zone of the shroud. The restrictor prevents the flow of inlet air through the centrifugal fan in the region of the conformal shroud.
Fetherstonhaugh & Co.
Trane International Inc.
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