Impeller and axial fan

US11231045B2 · kind B2 · utility

Assignee

• NIDEC CORPORATION · JP

Inventors

• Hideyuki Takemoto · Kawasaki, JP
• Kazuhiro Inouchi · Kyoto, JP

Key dates

• Filing date: Oct 8, 2020
• Grant date: Jan 25, 2022
• Expiry date: Oct 8, 2040

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05D2260/96
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An impeller includes Z blades, where Z is an integer equal to 5 or more, arranged in a circumferential direction of the impeller and extending radially, pitch angles between adjacent blades being all different. In terms of an arbitrary pitch angle θ, when a pitch angle α1 adjacent to the pitch angle θ, and a pitch angle α2 adjacent to the pitch angle θ, different from the pitch angle α1, satisfy a relation, α1<α2, a pitch angle β1 different from the pitch angle θ adjacent to the pitch angle α1 and a pitch angle β2 adjacent to the pitch angle β2, different from the pitch angle θ, satisfy a relation, β2<β1.