Curved flexible impeller
AssigneeNok Corporation
InventorKoji Tsukamoto
Life of this patent
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Abstract
An impeller is attached to a rotary shaft provided in an inner space of a housing and includes a tube fixed to the rotary shaft and a plurality of blades protruding toward an outer diameter direction from the tube. A tip of each blade is in slidable contact with an inner peripheral surface of the housing. Each blade has a shape curved toward a rotation-direction rear side of the rotary shaft in a free state and includes an extension surface on a rotation-direction front side of the rotary shaft and a compression surface on the rotation-direction rear side of the rotary shaft. A curvature radius of a root on the compression surface in the blade is formed larger than a curvature radius of a root on the extension surface in the blade.
Claims2
An impeller attached to a rotary shaft provided in an inner space of a housing, the impeller comprising:
- a tube fixed to the rotary shaft;
- and
- a blade protruding toward an outer diameter direction from the tube, a tip of the blade being in slidable contact with an inner peripheral surface of the housing,
- wherein the blade has a shape curved toward a rotation-direction rear side of the rotary shaft in a free state and includes an extension surface on a rotation-direction front side of the rotary shaft and a compression surface on the rotation-direction rear side of the rotary shaft, and
- wherein a curvature radius of a root on the compression surface in the blade is formed larger than a curvature radius of a root on the extension surface in the blade.
Dependencies are inferred from the claim text.