Fuel-fired heating appliance with dilution air/flammable vapor bypass tube and elevated combustion air inlet
US6622661B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 2003 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Jan 16, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23M2900/11021
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A fuel-fired heating apparatus, representatively a forced draft or natural draft gas-fired water heater having a combustion chamber, is provided with a flammable vapor control system that functions, during firing of the apparatus, to substantially prevent entry into and combustion within the combustion chamber of extraneous flammable vapors externally adjacent the bottom of the apparatus, without detecting the extraneous flammable vapors or terminating firing of the apparatus. The flammable vapor control system includes a dilution air flow passage connected to a discharge portion of the apparatus vent structure and having an inlet externally adjacent a bottom portion of the apparatus and operative to draw dilution air and extraneous flammable vapors into the vent structure discharge portion, and a combustion air flow passage having an inlet disposed adjacent the upper end of the apparatus, and an outlet communicated with the interior of the combustion chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.