Title:
AXIAL FLOW FAN, AND INDOOR UNIT FOR AIR CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2022/049665
Kind Code:
A1
Abstract:
An axial flow fan according to the present invention comprises a hub that is rotationally driven and forms a rotational shaft, and blades formed at the periphery of the hub. The blades each have a front edge part, a rear edge part, an outer peripheral edge part, and an inner peripheral edge part. When a first diagram is hypothesized such that in a cross section of a blade along the axial direction of the rotational shaft and the circumferential direction of the axial flow fan, the angle between a virtual line, which intersects the rear edge part and is parallel to the rotational shaft, and a virtual line indicating the direction in which the rear edge part is facing is defined as a blade exit angle, the horizontal axis is defined as the distance, in the radial direction of the axial flow fan, from the inner peripheral edge part at the rear edge part to the outer peripheral edge part, and the vertical axis is defined as the size of the exit angle, and when the relationship of the size of the exit angle with respect to the radial-direction distance from the inner peripheral edge part of the rear end part is represented as a first line, the fan has a blade formed such that in the first diagram, the first line has a downward protrusion that protrudes below a first virtual line represented by a straight line having a linear shape that connects a position for the size of the exit angle at the rear edge part on the inner circumferential edge part, and a position for the size of the exit angle at the rear edge part on the outer circumferential edge part.
Inventors:
YAMAMOTO KATSUYUKI (JP)
TADOKORO TAKAHIDE (JP)
TADOKORO TAKAHIDE (JP)
Application Number:
PCT/JP2020/033229
Publication Date:
March 10, 2022
Filing Date:
September 02, 2020
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
F04D29/38; F04D29/66
Foreign References:
| JP2014080970A | 2014-05-08 | |||
| JP2014058902A | 2014-04-03 | |||
| JP2001227498A | 2001-08-24 | |||
| JP2008111383A | 2008-05-15 | |||
| JPH09144697A | 1997-06-03 |
Other References:
See also references of EP 4209682A4
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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