# US 8,678,816 B2 · Hot air internal ignition burner/generator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,678,816 B2 - Document ID: US8678816B2 - Status: Granted - Kind: B2 - Application number: 12/091,928 - Filed: 2005-10-28 - Published: 2008-10-02 - Granted: 2014-03-25 - Earliest claimed: 2005-10-28 - Assignees: Sefmat - Applicants: Jean-Claude Sarrazy - Inventors: Jean-Claude Sarrazy - Web page: https://patentgrep.com/patent/US8678816B2 ## CPC - F23D 14/38: Torches, e.g. for brazing or heating (nozzles F23D14/48) - F23D 14/64: with injectors - F23D: BURNERS ## Abstract The invention relates to a hot air internal ignition burner/generator comprising an injection device used for producing a high-speed fuel gas mixture stream and for injecting said stream into the burner head (2) which is tabular-shaped and comprises in-series arranged therein a pressure recovery chamber (10), an igniting chamber (11) and simple or multiple diffusion means (24) which are fixed inside the head (2), where two chambers are jointed, wherein said diffusion means (24) comprise a central orifice provided with an igniting tube which penetrates therein and axially extends inside the pressure recovery chamber (10) in such a way that it defines the ignition chamber (43) provided with igniting electrodes (42) connected to the pressure recovery chamber (10) of the burner (2) via a calibrated orifice (46). ## Claims ### Claim 1 A hot air burner/generator with internal ignition comprising: a tubular burner head having a proximal end and a distal end; an injection device connected to the proximal end of the burner head and capable of producing a high velocity flow of a combustible gas mixture and injecting the high velocity flow through the burner head; the burner head including a pressure recovery chamber, the pressure recovery chamber having a flared shape delimited by two convergent walls having an increasing width and two divergent side walls having a decreasing width, the burner head further including a first ignition chamber, the first ignition chamber having a flared shape delimited by two parallel walls extending from the two convergent walls of the pressure recovery chamber and two divergent side walls of the first ignition chamber extending from the two divergent side walls of the pressure recovery chamber along the same orientations, respectively; and at least one diffusion grid attached between said pressure recovery chamber and said ignition chamber, said at least one diffusion grid having a central orifice and a concave shape with a concavity that is directed toward the first ignition chamber, an ignition chimney which extends axially inside the pressure recovery chamber, the ignition chimney having a proximal end and a distal end, the distal end of the ignition chimney extending through the central orifice of the at least one diffusion grid, a second ignition chamber and an ignition assembly, the second ignition chamber being situated between the ignition assembly and the proximal end of the ignition chimney, the ignition assembly including at least one first electrode for providing ignition to the gas flow. ### Claim 2 (depends on 1) The burner according to claim 1, wherein the second ignition chamber is tubular and is delimited on one side by the ignition chimney with a small passage section and closed on the opposite side by a bushing of an insulating material provided with the at least one first ignition electrode. ### Claim 3 (depends on 2) The burner according to claim 2, wherein said at least one first electrode cooperates with at least one ring-shaped portion made of an electrically conductive material, the ring-shaped portion forming a second ignition electrode surrounding the first. ### Claim 4 (depends on 1) The burner according to claim 1, wherein the ignition chimney is made of electrically conductive metal material. ### Claim 5 (depends on 3) The burner according to claim 3, wherein the aforesaid electrodes are electrically connected to an electric pulse generator housed in a handle attached to the burner. ### Claim 6 (depends on 1) The burner according to claim 1, wherein the head of the burner comprises an additional grid or sieve, having a mesh that is smaller than that of the diffusion grid and a total passage section that is larger than a total passage section of said diffusion grid. ### Claim 7 (depends on 6) The burner according to claim 6, wherein said additional grid or sieve is permanently positioned inside the pressure recovery chamber. ### Claim 8 (depends on 5) The burner according to claim 5, wherein the said burner head fits onto the end of a tubing of the injection device by an assembly including sealing gaskets and an electric connection tab allowing said burner to rotate with respect to said tubing. ### Claim 9 (depends on 8) The burner according to claim 8, wherein said assembly comprises three successive coaxial grooves, axially shifted, provided in a fitting area of said tubing, said sealing gaskets comprise two O-ring gaskets of a resilient material, respectively positioned in the first and third grooves and said electric connection tab comprises an elastically deformable metal retention blade, the blade having a curved end which is engaged with the central groove, this metal retention blade being firmly attached to said burner head. ### Claim 10 (depends on 8) The burner according to claim 8, wherein said electric pulse generator is connected to said first ignition electrode by means of an electric conductive wire and a connector located at the fitting area of the tubing. ### Claim 11 (depends on 10) The burner according to claim 10, wherein said connector comprises an insulating collector support in the form of a tubular sleeve which fits into or onto the tubing. ### Claim 12 (depends on 8) The burner according to claim 8, further comprising a tubular extender which is inserted between the front end of the tubing and the burner head. ### Claim 13 (depends on 12) The burner according to claim 12, comprising an electric connection passing inside the extender, said electric connection comprising a connecting rod having a rectilinear section which extends obliquely with respect to a longitudinal axis of the extender. ### Claim 14 (depends on 12) The burner according to claim 12, wherein the tubing comprises a male assembly profile at an end of the tubing, the extender comprises a rigid tube, having on a first side, a female assembly profile that connects to the male assembly profile of the end of the tubing and, on a second side, a male assembly profile identical with the male assembly profile of the tubing, the extender comprises, at the base of the female assembly profile, a coaxial electric contact finger mounted on a electrically insulating support, said electric contact finger comprising at least one radial groove intended to receive a radial rectilinear strand of a spring of the male assembly profile of the tubing, and the male assembly profile of the tubing comprising an electric diffusion washer connected to the electric contact finger via a flexible connecting conductive wire sheathed in an insulating coating. ### Claim 15 (depends on 14) The burner according to claim 14, wherein the female assembly profile has a ball snap-on mechanism. ### Claim 16 (depends on 12) The burner according to claim 12, wherein the extender is telescopically extensible and said burner has an electric connection comprising a connecting conductive rod made as a coil formed of shape memory materials. ### Claim 17 (depends on 12) The burner according to claim 12, wherein the extender is telescopically extensible and said burner has an electric connection made in at least two oblique rigid components relatively to a longitudinal axis of the extender, a first one of said two components having a tubular shape and a second one of said two components being a cylindrical rod which closely engages into the first one of said two components. ### Claim 18 (depends on 17) The burner according to claim 17, wherein said two components extend at an oblique angle with respect to the longitudinal axis of the extender.