Flame retention head assembly for fuel burners

US4780077A · kind A · utility

Inventor

• Denis Lefebvre · Mascouche, CA

Key dates

• Filing date: Dec 18, 1986
• Grant date: Oct 25, 1988
• Expiry date: Dec 18, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23D11/406
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A flame retention head assembly for use in a fuel burner having a fuel nozzle mounted coaxially within an air pipe. This assembly comprises a continuously contoured, outwardly diverging flame retention head mounted concentrically within the air pipe in front of the fuel nozzle. This head successively defines, starting from its inlet end: an air-and-fuel mixture chamber; a first expansion chamber; a throttle and a second expansion chamber. A spinner plate is mounted transversely across the inlet end of the head. This plate comprises a central ring provided with a central hole having a diameter substantially identical to the one of the fuel nozzle, and a plurality of blades regularly distributed around the ring to cause air to enter and swirl into the mixture chamber. A round-shaped deflector is also mounted concentrically transversally within the retention head, to cause the air and fuel entering the head through its inlet end to stay longer within the first or second expansion chamber. The second expansion chamber is provided with circumferentially spaced air apertures to allow air to pass into the retention head to sustain combustion therein.