Burner for gas oven comprising a device for retaining a flame of the burner, separating the flame from a mixing chamber capable of receiving a flow of primary air and gas to form a gaseous mixture. The flame retention device is provided with a mesh comprising metal threads, capable of allowing said
Burner for gas oven comprising a device for retaining a flame of the burner, separating the flame from a mixing chamber capable of receiving a flow of primary air and gas to form a gaseous mixture. The flame retention device is provided with a mesh comprising metal threads, capable of allowing said gaseous mixture to pass through the mesh, said mesh comprising at least one main zone and a pilot zone which are adjacent. The pilot zone having, according to a main direction of the flame of the burner, a thickness greater than the thickness of the main zone, capable of slowing down the gaseous mixture passing through the pilot zone relative to the mixture passing through the main zone. The burner comprises at least one orifice capable of receiving a secondary air flow.
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What is claimed is: 1. A burner for a gas oven comprising: a mixing chamber configured to receive a flow of primary air and gas to form a gaseous mixture; a flame retention device configured to retain a flame of the burner, separating the flame and the mixing chamber, wherein the flame retention de
What is claimed is: 1. A burner for a gas oven comprising: a mixing chamber configured to receive a flow of primary air and gas to form a gaseous mixture; a flame retention device configured to retain a flame of the burner, separating the flame and the mixing chamber, wherein the flame retention device comprises a mesh comprising: metal threads, configured to allow said gaseous mixture to pass through the mesh, at least one main zone; and a pilot zone adjacent to the at least one main zone, the pilot zone having, according to a main direction of the flame of the burner, a thickness greater than the thickness of the main zone, configured to slow down the gaseous mixture passing through the pilot zone relative to the mixture passing through the main zone; and at least one orifice configured to receive a secondary air flow. 2. The burner according to claim 1, wherein the main zone of the mesh has a porosity level of between 60% and 90% and a thickness of between 3 and 8 mm. 3. The burner according to claim 1, wherein the thickness ratio of the pilot zone to the main zone is between 2 and 5. 4. The burner according to claim 1, further comprising a means for guiding the secondary air flow towards the flame. 5. The burner according to claim 1, wherein the flame retention device comprises a principal disc perpendicular to the direction of the flame of the burner and a coaxial pilot ring, superposed on the periphery and downstream of the principal disc, the ring and the disc each comprising a mesh of metal threads. 6. The burner according to claim 1, wherein the orifice configured to receive the secondary air flow is located on the periphery of the flame retention device. 7. The burner according to claim 1, further comprising a housing connected to a fan and surrounding the mixing chamber in addition to the secondary air orifice(s); the fan being connected on the inside of the housing, to the mixing chamber by a bypass connecting means configured to introduce the primary air flow into the mixing chamber and deflecting the secondary air flow towards the housing. 8. The burner according to claim 7, wherein the bypass connecting means comprises crosspieces pushed between an inlet plate of a venturi device and an outlet plate of the fan, the mechanical connection between the venturi device and the fan being rigid but not sealed, the air from the fan being divided between the primary flow and the secondary flow. 9. The burner according to claim 8, wherein the secondary air flow escaping by means of the bypass connecting means is enclosed by the housing and may escape through peripheral orifices, the space separating the inlet plate of the venturi and the outlet plate of the fan being controlled so that the secondary air flow, escaping from the bypass connecting device, has a pressure greater than atmospheric pressure and greater than the pressure inside a combustion pipe, a secondary air flow passing through the peripheral orifices in the direction of the flame. 10. The burner according to claim 1, wherein the metal threads of the mesh are arranged to form, according to the direction of the flame, a series of deflecting obstacles configured to deflect the path of a stream of the gaseous flow. 11. The burner according to claim 7, wherein the metal threads of the mesh are arranged to form, according to the direction of the flame, a series of deflecting obstacles configured to deflect the path of a stream of the gaseous flow. 12. The burner according to claim 1, wherein the mixing chamber is provided with a static suction device intended to be passed through by a primary air flow and configured to suck up the inflammable gas. 13. A flame burner for a gas oven comprising: a mixing chamber configured to receive a flow of primary air and gas to form a gaseous mixture; at least one orifice configured to receive a secondary air flow; and a flame retention device, separating the flame from the mixing chamber, the flame retention device comprising: a mesh configured to allow said gas mixture to pass though comprising: metal threads configured to deflect the path of the gas streams; at least one main zone; and a pilot zone adjacent to the at least one main zone, the pilot zone having, according to a main direction of the flame of the burner, a thickness greater than the thickness of the main zone, configured to reduce the speed of the gaseous mixture passing through the pilot zone to a value lower than the speed of the mixture passing through the main zone. 14. The burner according to claim 2, wherein the thickness ratio of the pilot zone to the main zone is between 2 and 5. 15. The burner according to claim 8, wherein the secondary air flow escaping by means of the bypass connecting means is enclosed by the housing and may escape through peripheral orifices, the space separating the inlet plate of the venturi and the outlet plate of the fan being controlled so that the secondary air flow, escaping from the bypass connecting device, has a pressure greater than atmospheric pressure and greater than the pressure inside a combustion pipe, a secondary air flow passing through the peripheral orifices in the direction of the flame. 16. The burner according to claim 8, wherein the crosspieces comprise small pillars or washers.
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이 특허에 인용된 특허 (13)
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