The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11391295 B1

Date of Patent:

Jul. 19, 2022

Filed:

Mar. 05, 2018

Propeller fan

Applicant:

Fujitsu General Limited, Kanagawa, JP;

Inventors:

Hirotaka Sawada, Kanagawa, JP;

Kazuya Funada, Kanagawa, JP;

Assignee:

FUJITSU GENERAL LIMITED, Kanagawa, JP;

Attorney:

Paratus Law Group, PLLC

Primary Examiner:

Richard A Edgar

Int. Cl.

CPC ...

F04D 29/32 (2006.01); F04D 29/38 (2006.01); F04D 29/66 (2006.01);

U.S. Cl.

CPC ...

F04D 29/325 (2013.01); F04D 29/38 (2013.01); F04D 29/384 (2013.01); F04D 29/388 (2013.01); F04D 29/661 (2013.01); F05B 2240/30 (2013.01);

Abstract

A propeller fan includes: a hub having a side surface about a center axis; and a plurality of blades provided on the side surface of the hub. Each blade includes an inner peripheral portion positioned closer to a base portion of the each blade connected to the hub, and an outer peripheral portion positioned closer to an outer edge of the each blade. A ratio r/R between a radius r as a distance from the center axis to a boundary between the inner peripheral portion and the outer peripheral portion and a radius R as a distance from the center axis to the outer edge of each blade is equal to or lower than 0.4. A relational expression of V<V×1.3 is satisfied, where an air velocity at the outer peripheral portion is Vand an air velocity at the inner peripheral portion is V

Find Patent Forward Citations