Abstract: A gas burner of cold nozzle type is provided including an injection device for injecting a flow of a fuel gas mixture into a burner head, including successively: a pressure recovery chamber having a divergent profile, an ignition chamber having two parallel walls extended by two deflectors whose front edges form therebetween a passage of reduced width, and a diffusion grid forming a convex wall between said chambers. The front edges of the deflectors and said diffusion grid have substantially coaxial circular shapes.

Abstract: An ignition device for a high speed burner of the cold nozzle type including a conventional type injector, an adaptation chamber into which the injector emerges and ending in an orifice with an outwardly curved grid and an ignition chamber, an ignition cavity is also provided external to the ignition chamber and communicating therewith through an orifice of reduced passage section provided in the wall of the ignition chamber substantially in line with the front region of the grid.

Abstract: A gas burner for burning a high velocity gas to produce an external flame having a homogeneous front portion and using gas injecting means having a nozzle connected to a source of inflammable gas under pressure and an air passage adapted to create through a tube a flow of air and inflammable gas at high speed which is injected in an adaptation chamber connected to the tube and provided with an internal curved diffusion grill and two external deflectors, the diffusion grill being positioned so that the walls of the adaptation chamber are maintained at the temperature of the environment during combustion of the gas.

Abstract: A gas burner for burning a high velocity gas to produce an external flame having a homogeneous front portion and using gas injecting means having a nozzle connected to a source of inflammable gas under pressure and an air passage adapted to create through a tube a flow of air and inflammable gas at high speed which is injected in an adaptation chamber connected to the tube and provided with an internal curved diffusion grill and two external deflectors, the diffusion grill being positioned so that the walls of the adaptation chamber are maintained at the temperature of the environment during combustion of the gas.