CROSS-REFERENCE

This application claims priority from Japanese Patent Application No. 2017-101028 and Japanese Patent Application No. 2017-101029 filed with the Japan Patent Office on May 22, 2017, the entire content of which is hereby incorporated by reference.

FIELD

The present disclosure relates to a propeller fan.

BACKGROUND ART

For example, an air conditioner has, in an outdoor unit thereof, a propeller fan. An air velocity at the propeller fan is faster at a blade outer peripheral portion, and decreases toward the center of rotation. In recent years, the volume of air from the propeller fan has been improved for improvement of energy saving performance of the air conditioner. Specifically, the size of the propeller fan has been increased, and the speed of rotation of the propeller fan has been increased, for example.

Note that the technique of this area is disclosed in Japanese Laid-open Patent Publication No. 2010-101223, PCT International Application Publication No. WO 2011/001890 A. Japanese Translation of PCT International Application Publication No. JP-T-2003-503643, and Japanese Laid-open Patent Publication No. 2004-116511, for example.

SUMMARY

A propeller fan includes: a hub having a side surface about a center axis; and a plurality of blades provided on the side surface of the hub. Each blade includes an inner peripheral portion positioned closer to a base portion of the each blade connected to the hub, and an outer peripheral portion positioned closer to an outer edge of the each blade. A ratio r/R between a radius r as a distance from the center axis to a boundary between the inner peripheral portion and the outer peripheral portion and a radius R as a distance from the center axis to the outer edge of each blade is equal to or lower than 0.4. A relational expression of V1<V2×1.3 is satisfied, where an air velocity at the outer peripheral portion is V1and an air velocity at the inner peripheral portion is V2.

