Axial fan blower
AssigneeTti (Macao Commercial Offshore) Limited
InventorRonald J. Hoffman
Life of this patent
Estimating the term…
Abstract
A blower includes a first fan stage with a first housing that has a first plurality of stationary vanes and a first fan that has a first plurality of blades extending radially outwardly from a first hub. The first housing includes a first axial end and a second axial end opposite the first axial end. The blower also includes a second fan stage coupled to the first fan stage. The second fan stage includes a second housing with a second plurality of stationary vanes and a second fan that has a second plurality of blades extending radially outwardly from a second hub. The second fan stage includes a third axial end and a fourth axial end opposite the third axial end. The first hub and/or the second hub has a frustoconical shape that converges from the first axial end toward the fourth axial end.
Claims15
A blower comprising:
- a motor;
- a main housing supporting the motor;
- a fan assembly operatively coupled to the motor, the fan assembly including
- a fan housing having a first end coupled to the main housing and an opposite, second end,
- a first fan stage supported in the fan housing and including a first plurality of stationary vanes and a first fan having a first plurality of blades extending radially outwardly from a first hub, the first hub having a frustoconical shape, when supported in the fan housing, diverging in a direction from the first end toward the second end, the first hub having a first maximum diameter, and
- a second fan stage supported in the fan housing and including a second plurality of stationary vanes and a second fan having a second plurality of blades extending radially outwardly from a second hub, the second hub having a second maximum diameter, the second maximum diameter being greater than the first maximum diameter;
- an air inlet defined at least partially within the main housing;
- and
- a tapered air outlet that is coupled to the second end of the fan housing,
- wherein the fan housing further includes a constant inner diameter along an entire length of the first hub.
A blower attachment comprising:
- an input shaft rotatable about an axis, the input shaft being operable to be driven by a power unit;
- a fan assembly operatively coupled to the input shaft, the fan assembly including
- a first fan stage including a first plurality of stationary vanes and a first fan having a first plurality of blades extending radially outwardly from a first hub, and
- a second fan stage including a second plurality of stationary vanes and a second fan having a second plurality of blades extending radially outwardly from a second hub, and
- a fan housing supporting the first fan stage and the second fan stage, the fan housing having
- a cylindrical inner surface having a constant inner diameter defining a passage extending axially along a majority of a distance between an upstream first end toward the input shaft and a downstream second end opposite the first end,
- a first annular flow area being defined orthogonal to the axis between the first hub and the cylindrical inner surface of the fan housing at a first axial position, and
- a second annular flow area being defined orthogonal to the axis between the second hub and the cylindrical inner surface of the fan housing at a second axial position downstream of the first axial position, the first annular flow area being greater than the second annular flow area;
- and
- a tapered air outlet coupled to the second end, wherein the first hub has a frustoconical shape, when supported in the fan housing, diverging in a direction from the first end toward the second end, and wherein a maximum diameter of the first hub is smaller than a maximum diameter of the second hub.
Dependencies are inferred from the claim text.