Burner flashback detection and system shutdown apparatus
US7849821B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2007 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Aug 29, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24H1/205
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A fuel-fired water heater is provided with a premixing type main burner and an associated pilot burner for igniting it. A specially designed protective system is operative to detect a flame flashback burning condition in the main burner and responsively shut down the water heater. In one embodiment thereof, the protective system uses main burner body heat to melt a portion of a fuel supply line connected to the pilot burner during a flame flashback condition in the main burner. Such melting responsively causes an associated fuel supply valve to close and terminate water heater operation. In a second protective system embodiment a normally closed pressure switch is opened, thereby shutting down the water heater, when the switch detects a pressure indicative of a flame flashback condition in the main burner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.