Patent ID: 8678759
Filing Date: 2014-03-25
Classification: F04D,F05D

Abstract:
1. A centrifugal blower unit comprising: an impeller; a scroll portion of a volute shape surrounding a periphery of the impeller; a tongue-like portion continuously connected to an outlet port of the scroll portion; and a side casing plate connected to the scroll portion and the outlet port, and provided with an inlet port at a side of the impeller, wherein: the centrifugal blower unit is provided with a tapered scroll wall of a slant surface formed between the scroll portion and the side casing plate in areas adjacent to the outlet port, a distance of the tapered scroll wall to the tongue-like portion gradually becomes smaller toward the side casing plate, a width of the tapered scroll wall expands gradually toward the outlet port, the centrifugal blower unit is further provided with an outlet port edge comprising the tongue-like portion, an anti-tongue-side wall and the tapered scroll wall, and the anti-tongue-side wall and the tapered scroll wall of the outlet port edge are configured to form the outlet port in a polygonal shape so that the opening of the outlet port is reduced toward the side casing plate.