DC motor driven centrifugal fan
US5052888A · kind A · utility
7Cited by
9References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1990 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Jul 11, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/424
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A centrifugal fan includes a brushless d.c. motor, an impeller mounted on the motor and a scroll on which the motor is mounted. The scroll defines the air inlet and outlet and has an outer wall curved around the impeller to define a divergent air flow path. By truncating the scroll at the outlet substantially to eliminate any flat portions on the outer wall susceptible to mechanical vibrations at frequencies excited by the d.c. motor, a noise reduction is achieved. Further noise reduction may be achieved by resiliently mounting the motor on the scroll.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.