Patent ID: 6280143
Filing Date: 2001-08-28
Classification: F04D

Abstract:
A blade for use with a motor for moving fluid to create a fluid suction device, said blade comprising a generally conical shape, said blade comprising a first generally conical wall having a first inner surface and a first outer surface and said blade comprising a second generally conical wall, having a second inner surface and a second outer surface, said blade further comprising a plurality of vanes extending between said first and second walls to define a plurality of fluid flow channels between said first generally conical wall and said second generally conical wall and adjacent pairs of said vanes, and wherein said first and second generally conical walls have a common general axis of rotation, said blade having a fluid inlet for said plurality of fluid flow channels located substantially on said axis, said blade having a fluid outlet for said plurality of fluid flow channels, which outlet is located radially outwardly of said axis of rotation, and which outlet is located axially spaced from said inlet with respect to said axis, so that fluid flowing in said fluid flow channels moves radially outwardly and axially along with respect to said axis, and said fluid flow channels are defined by said first inner surface and said second inner surface wherein at least one of said first inner surface and said second inner surface is curved in a plane which contains said axis, at least one of said fluid flow channels is defined by a portion of said first inner surface and a portion of said second inner surface, and two adjacent vanes, and wherein at least one of said first inner surface and said second inner surface is curved in a polar plane relative to said axis and said curve is concave when viewed from the interior of said fluid flow channel.