Patent ID: 8734097
Filing Date: 2014-05-27
Classification: A61M,F04D

Abstract:
1. A blower comprising: an electric motor having a shaft that defines a shaft axis; a housing having a housing inlet and a housing outlet between which is defined a flow path for gas; the housing outlet is structured to direct gas exiting the blower in an axial first direction; a first impeller attached to the shaft and adapted to accelerate air tangentially and to direct it radially outward; a stationary portion including a first stator vane structure including a plurality of stator vanes each having a generally spiral shape, the first stator vane structure defining a plurality of stator vane leading edges, the first stator vane structure further defining a stator vane outer radial edge, the first stator vane structure having an inner end, the first stator vane structure and its generally spiral-shaped stator vanes thereof being arranged to smoothly direct the gas flow along a curved path, said curved path directing flow at the inner end of the first stator vane structure in a radially inward direction; a shield having an outer edge extending radially beyond the outer radial edge of the first stator vane structure; said shield adapted to isolate the stator vane leading edges from an impeller blade pressure pulse, wherein there is an annular gap between he outer edge of the shield and the stationary portion.