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US 11,536,288 B2Granted
Propeller fan
AssigneeFujitsu General Limited
InventorsHirotaka Sawada, Kazuya Funada
Life of this patent
Estimating the term…
Abstract
A propeller fan includes a hub that has a side surface around a central axis, and blades that are provided on the side surface, wherein a blade of the blades includes an inner peripheral portion located on a side of a base, and an outer peripheral portion located on a side of an outer edge, the outer peripheral portion is formed as one blade, the inner peripheral portion includes blade elements arranged at a predetermined interval, a ratio r/R of a radius r which is a distance from the central axis to the outer peripheral portion and a radius R which is a distance from the central axis to the outer edge is 0.4 or less, and when a wind speed at the outer peripheral portion is V1 and a wind speed at the inner peripheral portion is V2, a relational formula of V1≤V2×2.0 is established.
Claims3
A propeller fan comprising:
- a hub that has a side surface around a central axis;
- and
- a plurality of blades that are provided on the side surface of the hub, wherein
- a blade of the plurality of blades includes an inner peripheral portion that is located on a side of a base connected to the hub of the blade, and an outer peripheral portion that is located on a side of an outer edge of the blade,
- the outer peripheral portion is formed as one blade surface,
- the inner peripheral portion includes a plurality of blade elements arranged at a predetermined interval,
- a ratio r/R in which a radius r which is a distance from the central axis to a boundary between the inner peripheral portion and the outer peripheral portion and a radius R which is a distance from the central axis to the outer edge of the blade is 0.4 or less, and
- wherein the outer peripheral portion increases in width as the outer peripheral portion extends towards the outer edge of the blade, and
- wherein the propeller fan is configured such that, in operation, when a wind speed at the outer peripheral portion is V1 and a wind speed at the inner peripheral portion is V2, each chord length of the plurality of blades is configured such that a relational formula of V1≤V2×2.0 is satisfied.
6 more elements
A propeller fan comprising:
- a hub that has a side surface around a central axis;
- and
- a plurality of blades that are provided on the side surface of the hub, wherein
- a blade of the plurality of blades includes an inner peripheral portion that is located on a side of a base connected to the hub of the blade, and an outer peripheral portion that is located on a side of an outer edge of the blade,
- the outer peripheral portion is formed as one blade surface,
- the inner peripheral portion includes a plurality of blade elements arranged at a predetermined interval,
- a ratio r/R in which a radius r which is a distance from the central axis to a boundary between the inner peripheral portion and the outer peripheral portion and a radius R which is a distance from the central axis to the outer edge of the blade is 0.4 or less, and
- wherein the plurality of blade elements include a first blade element and a second blade element,
- the first blade element and the second blade element are respectively positioned on a downstream side and an upstream side in a rotation direction with respect to the hub, and
- a first height on a most positive pressure side in the center axis direction, in a portion connecting the first blade element and the side surface of the hub is positioned between a second height on a most negative pressure side in the center axis direction, in a portion connecting the second blade element and the side surface of the hub, and a third height on a most positive pressure side in the center axis direction, in the portion connecting the second blade element and the side surface of the hub, and
- wherein the propeller fan is configured such that, in operation, when a wind speed at the outer peripheral portion is V1 and a wind speed at the inner peripheral portion is V2, each chord length of the plurality of blades is configured such that a relational formula of V1≤V2×2.0 is satisfied.
8 more elements
A propeller fan comprising:
- a hub that has a side surface around a central axis;
- and
- a plurality of blades that are provided on the side surface of the hub, wherein
- a blade of the plurality of blades includes an inner peripheral portion that is located on a side of a base connected to the hub of the blade, and an outer peripheral portion that is located on a side of an outer edge of the blade,
- the outer peripheral portion is formed as one blade surface,
- the inner peripheral portion includes a plurality of blade elements arranged at a predetermined interval,
- a ratio r/R in which a radius r which is a distance from the central axis to a boundary between the inner peripheral portion and the outer peripheral portion and a radius R which is a distance from the central axis to the outer edge of the blade is 0.4 or less, and
- wherein a relational expression of Lmin/L0≥0.1 is satisfied, where a total chord length of the plurality of blade elements is LO, and a minimum one of the chord lengths of the plurality of blade elements is Lmin, and
- wherein the outer peripheral portion increases in width as the outer peripheral portion extends towards the outer edge of the blade, and
- wherein the propeller fan is configured such that, in operation, when a wind speed at the outer peripheral portion is VI and a wind speed at the inner peripheral portion is V2, each chord length of the plurality of blades is configured such that a relational formula of V1≤V2×2.0 is satisfied.
7 more elements
Dependencies are inferred from the claim text.