| 摘要 |
PROBLEM TO BE SOLVED: To improve combustion exhaust gas by providing a rich burner port, a lean burner port and a secondary air opening for a vaporization plane and disposing a plurality of secondary air openings and rich and lean burner ports oppositely to a vaporizer in the order of secondary air opening, rich burner port, lean burner port and rich burner port thereby forming a stable flame. SOLUTION: Liquid fuel collides against a vaporization plane 25 along with combustion air entering into a vaporizer 23 and vaporized thermally to form a combustible mixture gas. It is mixed uniformly in a mixing chamber 31 and partially delivered to a rich burner port 33 and to a lean burner port 34 after being diluted with combustion air. Combustion air from a fan 29 is partially fed to a secondary air opening 35. Mixture gas injected from the rich burner port 33 and the lean burner port 34 is ignited at the rich burner port 33 to form a rich flame which is shifted sequentially to form rich and lean flames, respectively, at the rich burner port 33 and the lean burner port 34. The rich flame holds the lean flame and secondary air from the injection opening 36 of the secondary air opening 35 holds the rich flame while surrounding thus sustaining stabilized combustion in a combustion chamber 38 defined by the burner head case 37. |
