Combustion control apparatus
US4370126A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1980 |
| Grant date | Jan 25, 1983 |
| Priority date | — |
| Expiry date | May 5, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2241/04
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
This invention relates to a control circuit which controls combustion in a burner acting as a heat source of a hot-water boiler or a hot-air heater. More particularly, the present invention relates to a control circuit having a sequence which includes post-discharge such that electric discharge for ignition is still continued for a predetermined period of time, even after attainment of ignition. In a combustion control apparatus, when ignition is not attained within a predetermined safty period, the igniting operation is stopped by a safty timer for timing this safety period, thereby ensuring the safety. It is necessary to reliably discontinue the igniting operatin even when this safety timer is disabled. The present invention attains this object and ensures the safety with a reduced number of timers. That is, a timer for timing the post-discharge period is provided independently of the safety timer, these two timers starting their timing operations at the same time, so that the fuel valve can be cut off by an output from the post-discharge timer too in the event of failure of ignition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.