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Patent Searching and Data


Title:
PROPELLER FAN
Document Type and Number:
WIPO Patent Application WO/2019/202641
Kind Code:
A1
Abstract:
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.

Inventors:
HASUIKE, Kazuki (13-5 Kudankita 1-chome, Chiyoda-k, Tokyo 73, 〒1020073, JP)
ARAI, Toshikatsu (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
Application Number:
JP2018/015744
Publication Date:
October 24, 2019
Filing Date:
April 16, 2018
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORPORATION (7-3 Marunouchi 2-chome, Chiyoda-ku Tokyo, 10, 〒1008310, JP)
International Classes:
F04D29/38
Foreign References:
JPH05502637A1993-05-13
JPH10510021A1998-09-29
JPH08177792A1996-07-12
US20160102674A12016-04-14
US1815529A1931-07-21
US4684324A1987-08-04
Attorney, Agent or Firm:
TAKAMURA, Jun (Sakai International Patent Office, Toranomon Mitsui Building 8-1, Kasumigaseki 3-chome, Chiyoda-k, Tokyo 13, 〒1000013, JP)
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