System and method for fan noise canceller
US11151978B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2020 |
| Grant date | Oct 19, 2021 |
| Priority date | — |
| Expiry date | Nov 19, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/11
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A fan noise cancellation device comprises a base with a resonant ring formed with a plurality of resonance channels and a cover coupled to the base. Each resonance channel comprises an inner channel and an outer channel. Each inner channel has an opening to the resonant ring and has a length corresponding to a frequency. A baffle positioned in each inner channel determines an effective length of the inner channel. The inner channel baffles are coupled to the cover, wherein rotation of the cover relative to the resonance ring changes the position of the inner channel baffles to change the effective lengths of the inner channels to adjust the fan noise cancellation waveform frequency. Vanes on the cover are positioned in an airflow such that the airflow rotates the cover, and a spring in each resonance channel counteracts the rotation to adjust the inner channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.