Pneumatic system for flame rollout and draft safeguard protection
US6390806B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2001 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Sep 28, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2233/00
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A furnace is provided with a flame rollout protection system which operates through an existing excess-air control pneumatic circuitry to shut down the furnace in the event of a flame rollout condition. A fusible tube is attached at its one end to the pneumatic system and extends into an area which will be exposed to hot gases in the event of a flame rollout condition. A melting of the tube by the hot gases causes the pressure therein to drop to ambient pressure such that of the pneumatic circuitry responsively causes the furnace to shut down. The tube is also extended to pass through an area which will be exposed to hot gases in the event of a blocked vent in the furnace, thereby causing a similar shut down of the furnace.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.