Impeller for a duct
AssigneeMinetek Investments Pty Ltd
InventorJohannes Petrus Van Der Walt
Life of this patent
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Abstract
An impeller (20, 120) for a ducted fan arrangement (10, 110), the impeller (20, 120) including a hub (24, 124) and a plurality of blades (26, 126) extending radially from the hub (24, 124), each of the plurality of blades (26, 126) including a root (28, 128) proximate the hub (24, 124) and a tip (30, 130). A camber of each of the plurality of blades (26, 126) is arranged to flatten or reduce between the root (28, 128) and the tip (30, 130). A fan arrangement (10, 110) including such an impeller (20, 120) is also disclosed.
Claims25
An impeller for a ducted fan arrangement, the impeller including a hub which is tapered to compress airflow and a plurality of blades extending radially from the hub, each of the plurality of blades including a root proximate the hub and a tip, wherein a camber of each of the plurality of blades is arranged to continuously flatten between the root and the tip so as to provide an impulse driven flow toward the hub and transition relatively toward a pressure driven flow toward the tip, wherein a tip camber at the tip of each of the plurality of blades is at least in the range of 15 to 50 degrees less than a root camber at the root of the blade, and wherein an impulse ratio at the tip is at least 10% less than an impulse ratio at the hub.
A ducted fan arrangement including:
- a duct body with an inlet and an outlet;
- a motor supported by the duct body;
- an impeller driven by the motor between the inlet and the outlet;
- and
- a diffuser supported by the duct body between impeller and the outlet,
- wherein the impeller includes a hub which is tapered to compress airflow coupled to the motor and a plurality of blades extending radially from the hub, each of the plurality of blades including a root proximate the hub and a tip,
- wherein a camber of each of the plurality of blades is arranged to continuously flatten between the root and the tip to provide an impulse driven flow toward the hub and transition toward a pressure driven flow toward the tip, and
- wherein a tip camber at the tip of each of the plurality of blades is at least in the range of 15 to 50 degrees less than a root camber at the root of the blade, and wherein an impulse ratio at the tip is at least 10% less than an impulse ratio at the hub.
Dependencies are inferred from the claim text.