US 2019/0316599 A1Published application

Propeller fan

AssigneeDaikin Industries, Ltd.

InventorsTooru IWATA, Hirotaka TOMIOKA

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Abstract

In a blade of a propeller fan, a position on a chord line where the camber becomes maximum is set as a maximum camber position A, and a ratio of a distance d between a leading edge and the maximum camber position A to a chord length c is set as a maximum camber position ratio. The end portion on the hub side of the blade is set as a blade root, and the end portion on the outer circumferential side of the blade is set as a blade end. In the blade, the maximum camber position ratio monotonically increases in the direction from the reference blade cross section located between the blade root and the blade end toward the blade end and becomes maximum at the blade end. Thus, fan efficiency of the propeller fan is improved.

Claims13

Dependent claims

A propeller fan, comprising a hub formed into a cylindrical shape, and a plurality of blades extending outwardly from a side surface of the hub, wherein

each of the blades is configured such that
a distance from a chord line to a mean line in a blade cross section is set as a camber, that in the blade cross section,
a position on the chord line where the camber becomes maximum is set as a maximum camber position, that
a ratio of a distance between a leading edge and the maximum camber position in the blade cross section to a chord length is set as a maximum camber position ratio, that
an end portion at the hub side of the blade is set as a blade root, that
an end portion of an outer circumferential side of the blade is set as a blade end, and that
the maximum camber position ratio at the blade end is larger than the maximum camber position ratio at the blade root.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/471,284Filed 8 Dec 2017
Priority: JP 2016-25537328 Dec 2016
Published: 17 Oct 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F04D 29/384
Blades: characterised by form
F04D 29/00
Details, component parts, or accessories
F04D 29/38
For axial flow pumps: blades
F04D 29/667
Especially adapted for elastic fluid pumps: by influencing the flow pattern, e.g. suppression of turbulence

Family

US 11,333,165 B2Related patent
US 2019/0316599 A1This patent

From the US filing history. Foreign family members aren’t listed.

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