Title:
PROPELLER FAN AND REFRIGERATION CYCLE DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/021468
Kind Code:
A1
Abstract:
The propeller fan according to the present invention is provided with blades each of which has a front edge portion, a rear edge portion, and a negative pressure surface and which rotate about a rotation axis. The blades are each provided with: a recessed portion recessed from the front edge portion; and a stepped portion which is provided on the negative pressure surface and of which the inner circumferential side and the outer circumferential side in the radial direction about the rotation axis have different heights. The stepped portion has a first end and a second end. The first end is disposed so as to face the recessed portion, and the second end is disposed closer to the rear edge portion than the first end is.
Inventors:
YAMAMOTO KATSUYUKI (JP)
NAKASHIMA SEIJI (JP)
NAKASHIMA SEIJI (JP)
Application Number:
PCT/JP2017/027484
Publication Date:
January 31, 2019
Filing Date:
July 28, 2017
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
F04D29/38
Foreign References:
| JP2016065536A | 2016-04-28 | |||
| JP2010203409A | 2010-09-16 | |||
| JP2000110790A | 2000-04-18 | |||
| JP2000345995A | 2000-12-12 | |||
| JP2009068361A | 2009-04-02 |
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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