PROPELLER FAN

WIPO Patent Application WO/2019/202641

A1

Provided is a propeller fan having a boss portion that rotates around a rotation axis, a blade that is provided around the boss portion and rotates together with the boss portion and that has a positive pressure surface facing forward in the rotation direction and a negative pressure surface facing backward in the rotation direction, and a protrusion that protrudes from the front edge, which is a front edge in the rotation direction of the blade, to the positive pressure surface side. When the radial direction and circumferential direction of the circle centered on the rotation axis are defined, the radius of the outer circumference of the blade is denoted by r1, the radius of the inner circumference of the blade is denoted by r2, the vane center radius rma is taken as rma = (r1 + r2)/2, and the blade length along the circumferential direction at the vane center radius rma is taken as the chord length cm, the protrusion amount H, which is the distance between the tip of the protrusion and the tangent, in the perpendicular direction extending toward the positive pressure surface with respect to the tangent of the front edge, when viewed along the radial direction, satisfies the following relationship: 0 < H ≤ 0.03 × cm.

HASUIKE KAZUKI (JP)
ARAI TOSHIKATSU (JP)

PCT/JP2018/015744

October 24, 2019

April 16, 2018

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MITSUBISHI ELECTRIC CORP (JP)

F04D29/38

JPH05502637A	1993-05-13
JPH10510021A	1998-09-29
JPH08177792A	1996-07-12
US20160102674A1	2016-04-14
US1815529A	1931-07-21
US4684324A	1987-08-04

TAKAMURA, Jun (JP)

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