Storeage gas water heater
US9568213B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2010 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Jan 18, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24H1/206
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A gas water heater includes a water tank, a combustion chamber, a burner, a heat exchanger tube at least partially within the water tank, and a fan. The burner receives fuel gas and primary air from a first air-supply channel to create a primary air-fuel mixture for combustion in the combustion chamber with secondary air. The primary air-fuel mixture has a gas concentration above the upper explosive limit of the fuel gas. Secondary air is supplied through a second air-supply channel to the combustion chamber. The secondary air creates a low excess air ratio (e.g., below 1.5) for combustion in the combustion chamber. A totally sealed channel is defined from the air inlet of the fan to the heat exchanger tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.