Axial flow fan
US7470108B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2005 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Jul 2, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/545
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an axial flow fan, for reducing fluid noise and further reducing the noise by suppressing solid-conveyed noise (structure-borne noise) generated by the vibration of an electric motor or the like, the axial flow fan is equipped with a propeller, a motor for driving the propeller, and a venturi portion disposed on the outer circumference side of the propeller and provided on its inner circumferential side with a bellmouth through which an air flow generated by the revolution of the propeller passes, wherein the bellmouth has an intake portion whose diameter contracts in a curved shape in the direction of the air flow, a cylindrical portion having a cylindrical shape, and a discharge portion whose diameter slantingly expands in the direction of the air flow.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.