Title:
プロペラファンおよび流体送り装置
Document Type and Number:
Japanese Patent JP6771562
Kind Code:
B2
Abstract:
In the present invention, the cross-sectional shape (S11) of a blade part is defined by a circular arc having an arbitrary radius and passing through a front-edge section and a back-edge section, a chord line (BC11) connecting the front-edge section and the back-edge section in the cross-sectional shape is defined, and a base line (BL11) parallel to the chord line is defined. A convex surface section (NC11), which has a surface shape that curves in a convex shape in a central axis direction, and a concave surface section (NV11), which is positioned between the convex surface section and the front-edge section and has a surface shape that curves in a concave shape in the central axis direction, are formed on the negative-pressure-surface side of the cross-sectional shape of the blade part. The convex surface section (NC11) has an apex (NC11c), which is a portion at which the distance from the base line to the convex surface section in the chord line direction changes from gradually increasing to gradually decreasing from the front-edge-section side toward the back-edge-section side. The apex is formed at a position at which the distance (NC11x) in the chord line direction from the front-edge section to the apex is no greater than 1/3 of the entire length (LL11) of the chord line.
Inventors:
Kumon Yui
Masao Otsuka
Masao Otsuka
Application Number:
JP2018529352A
Publication Date:
October 21, 2020
Filing Date:
January 26, 2017
Export Citation:
Assignee:
Sharp Corporation
International Classes:
F04D29/38
Domestic Patent References:
| JP2010150945A |
Attorney, Agent or Firm:
Fukami patent office