Axial electric fan of the flat type
US4482302A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 1981 |
| Grant date | Nov 13, 1984 |
| Priority date | — |
| Expiry date | Dec 29, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2260/96
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The cross-sectional area of the airflow duct on at least one face of the fan housing is larger than the cross-sectional area of a cylindrical portion of duct which cooperates with the impeller. A junction portion having an S-shaped cross-section in an axial plane is provided on at least part of the duct periphery between the cylindrical portion and that housing face. The fan duct progressively increases in width from the cylindrical portion to the housing face and the S-shaped junction portion has a point of inflection substantially at the midpoint of its axial length. A reduction in noise level is thus achieved during operation of the fan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.