Sound attenuating shield for an electric heater
US7802615B2 · kind B2 · utility
3Cited by
18References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2006 |
| Grant date | Sep 28, 2010 |
| Priority date | — |
| Expiry date | Jan 7, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F2265/28
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A sound-abating flow disruptor quiets a PTAC refrigerant system by disturbing the airflow between an energized electric heater and an adjacent fan wheel. In some embodiments, the flow disruptor is a perforated metal plate that attenuates a whistle, which appears to be caused by vortex shedding in the confined area between the energized heater and the fan. In some cases, the heater comprises selectively energizable heating elements of various wattage. The heating elements closest to the fan wheel are the lower wattage ones to minimize the heat near the fan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.