Impeller and axial fan
AssigneeNidec Corporation
InventorsHideyuki TAKEMOTO, Kazuhiro INOUCHI
Life of this patent
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Abstract
An impeller includes Z blades, where Z is an integer equal to 5 or more, arranged in a circumferential direction of the impeller and extending radially, and pitch angles between adjacent blades are all different. In terms of an arbitrary pitch angle θ, when a pitch angle α1 adjacent to the pitch angle θ, and a pitch angle α2 adjacent to the pitch angle θ, different from the pitch angle α1, satisfy a relation, α1<α2, a pitch angle β1 different from the pitch angle θ adjacent to the pitch angle α1 and a pitch angle β2 adjacent to the pitch angle α2, different from the pitch angle θ, satisfy a relation, β2<β1.
Claims10
An impeller comprising:
- Z blades disposed in a circumferential direction of the impeller and extending radially, where Z is an integer equal to 5 or more;
- and
- pitch angles between the corresponding blades adjacent to each other being all different;
- wherein
- in terms of an arbitrary pitch angle θ, when a pitch angle α1 adjacent to the pitch angle θ, and a pitch angle α2 adjacent to the pitch angle θ, different from the pitch angle α1, satisfy a relation, α1<α2, a pitch angle β1 different from the pitch angle θ adjacent to the pitch angle α1 and a pitch angle β2 adjacent to the pitch angle α2, different from the pitch angle θ, satisfy a relation, β2<β1;
- a number of the blades is an even number;
- the impeller includes:
- a first pitch angle that is greater than an angle acquired by dividing a circumference of the impeller by the number of the blades;
- and
- a second pitch angle smaller than the angle acquired by dividing the circumference of the impeller by the number of the blades;
- and
- the first pitch angle and the second pitch angle are alternately disposed in the circumferential direction.
An impeller comprising:
- Z blades disposed in a circumferential direction of the impeller and extending radially, where Z is an integer equal to 5 or more;
- and
- pitch angles between the corresponding blades adjacent to each other being all different;
- wherein
- in terms of an arbitrary pitch angle θ, when a pitch angle α1 adjacent to the pitch angle θ, and a pitch angle α2 adjacent to the pitch angle θ, different from the pitch angle α1, satisfy a relation, α1<α2, a pitch angle β1 different from the pitch angle θ adjacent to the pitch angle α1 and a pitch angle β2 adjacent to the pitch angle α2, different from the pitch angle θ, satisfy a relation, β2<β1;
- a number of the blades is an odd number;
- the impeller includes:
- a first pitch angle that is greater than an angle acquired by dividing a circumference of the impeller by the number of blades;
- a second pitch angle smaller than the angle acquired by dividing the circumference of the impeller by the number of blades;
- and
- a third pitch angle equal to the angle acquired by dividing the circumference of the impeller by the number of blades;
- and
- the first pitch angle and the second pitch angle are alternately disposed in the circumferential direction with respect to the third pitch angle.
Dependencies are inferred from the claim text.