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.
Claims1
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
- 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.
Dependencies are inferred from the claim text.