Sirocco fan having an inclined cutoff
US6254336A · kind A · utility
13Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Jan 19, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/422
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A sirocco fan which reduces abnormal noise and improves air flow includes: a scroll 2 with an inlet wall 8 and a closed endwall 9, the inlet wall 8 having an inlet and the endwall 9 being opposed to the inlet wall 8; and an impeller 3 provided in the scroll 2, for suctioning and exhausting air, wherein a cutoff 7 of the sirocco fan 1 is inclined so as not to allow entire sections of a blade 10 of the impeller 3 to be simultaneously met entire sections of the cutoff 7 when the blade 10 of the impeller 3 passes through the cuttoff 7, thereby achieving stable air flow.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.