Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/12—Radiant burners
  • F23D14/14—Radiant burners using screens or perforated plates
  • F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/12—Radiant burners
  • F23D14/14—Radiant burners using screens or perforated plates
  • F23D14/148—Radiant burners using screens or perforated plates with grids, e.g. strips or rods, as radiation intensifying means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C3/00—Stoves or ranges for gaseous fuels
  • F24C3/04—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate
  • F24C3/042—Stoves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2212/00—Burner material specifications
  • F23D2212/10—Burner material specifications ceramic

Definitions

• the present invention relates to the field of infrared radiation emitters, and in particular gas-heated emitters.
• Such screens can thus be formed by metal rods mounted in parallel, in the same plane, at a distance from each other.
• such screens can be formed by a set of interwoven metallic threads, or woven, between them.
• a mesh material to form the screen of a gas-heated infrared radiation emitter.
• Such mesh materials can be denoted by materials with a lattice structure, or alternatively by materials with a lattice structure.
• Such materials have in particular a geometric spatial organization.
• the structure of such materials corresponds to the repetition, in the three directions of space, of the same elementary geometric pattern (mesh or cell), preferably in three dimensions.
• such materials can have a structure forming the edges of the patterns (or meshes or cells) repeated in a three-dimensional network.
• the present invention aims to solve the various technical problems mentioned above.
• the present invention thus aims to provide a gas-heated infrared radiation emitter, exhibiting operating stability comparable to traditional emitters, and greater efficiency than that of traditional emitters.
• the present invention thus aims to provide a gas-heated infrared radiation emitter with a screen made of mesh material exhibiting improved operating stability, in particular during ignition.
• a gas-heated infrared radiation emitter comprising a burner plate, said burner plate serving as a combustion surface, and a radiating screen positioned on the side of the surface of combustion of said burner plate.
• Said radiating screen is formed by a material with mesh or open pores, and has an internal face oriented towards the combustion surface side of the burner plate.
• the internal surface of the screen comprises at least a first portion and a second portion offset from each other with respect to the combustion surface, so that the distance between the combustion surface and the first portion is less than the distance between the combustion surface and the second portion.
• the operating stability of the screen transmitter made of mesh material increased when the distance between the burner plate and the screen increased.
• the emitter may be difficult to ignite because the flame is caused to detach from the surface of the burner plate. and turn off.
• the distance of the screen of mesh material from the burner plate also leads to a decrease in the efficiency of the emitter, which can lead to performance similar to that of traditional screen emitters.
• the transmitter according to the present invention thus makes it possible to improve the operating stability of the transmitter, in particular during ignition, thanks to the second portion of the internal surface of the screen which is at a distance of burner plate, while keeping an infrared radiation efficiency higher than that of traditional screen transmitters, thanks to the first portion of the internal surface of the screen which remains in close proximity to the burner plate.
• the applicant has found that it is sufficient to keep a distance between the screen of mesh material and the burner plate, only on a portion of the internal surface of the screen, to maintain the flame on the plate. burner.
• the applicant has observed that the flame could, during the ignition of a transmitter according to the present invention, fall off especially at the level of the burner plate area located opposite the first portion of the screen, but not at the level of the burner plate area located opposite the second portion of the screen, so that the flame still present on the burner plate area located opposite the second portion of the screen could then rekindle the flame on the rest of the burner plate.
• the emitter according to the present invention it becomes possible to obtain a zone of the burner plate at which the flame remains attached and can rekindle the flame on the rest of the plate if it were to occur. turn off.
• the burner plate area located opposite the second portion of the screen also fulfills a pilot function for the transmitter, allowing it to be fully re-ignited when it comes to partial extinction.
• the difference in distance between the combustion surface and the first and second portions is between 0.5mm and 10mm, preferably between 1mm and 5mm.
• the screen also has an outer face opposite the inner face, the outer face being substantially planar and parallel to the two offset portions of the inner face so that the thickness of the screen at the level of the first portion is greater than the thickness of the screen at the level of the second portion.
• the internal face of the screen is formed by the absence or by withdrawal, at the level of the second portion, of one or more meshes.
• the screen made of mesh material comprising a structure resulting from the repetition, in the three directions of space, of the same elementary geometric pattern, it suffices to obtain the second portion of the internal surface located set back from the first internal surface portion, to remove or remove one or more elementary patterns of the structure of the mesh material, for example a layer of several elementary side patterns, the layer having a thickness of between 1 and 5 elementary patterns.
• the second portion of the screen is arranged substantially facing the center of the burner plate, for example facing the center of a ceramic plate, preferably perforated.
• the second portion of the screen is intended to be located opposite the area of the hottest burner plate. This is because the hottest areas of the burner plates may be caused to be damaged first, so that by providing the second screen portion facing such areas of the burner plate which are usually hotter, it becomes possible to limit the temperature and therefore to increase its lifespan.
• the transmitter comprises two burner plates mounted side by side, for example two ceramic plates, preferably perforated, and the screen comprises two second portions located substantially opposite the center of each of the burner plates.
• the second screen portions are provided facing the hottest areas, that is to say facing the center of each of the burner plates, in order to increase the service life of the 'transmitter.
• the second portion of the screen is arranged opposite a peripheral part of the burner plate, or each of the burner plates, for example on a peripheral part of the internal surface of the screen such as than a corner or along an edge of the inner surface of the screen.
• the screen forms edges of a plurality of geometric meshes assembled in a three-dimensional network.
• the screen forms a network of cubic meshes.
• the screen comprises silicon carbide, preferably infiltrated with silicon.
• Silicon carbide makes it possible to obtain good resistance at high temperature while keeping, unlike many ceramics, high thermal conductivity. This therefore makes it possible to obtain a screen temperature which is homogeneous, but also to avoid hot spots at the level of the combustion support.
• the first portion and the second portion are substantially plane and parallel to each other.
• substantially flat portions allows better control of the behavior of the flame at each of said portions.
• the first portion and / or the second portion are non-planar.
• the first portion and / or the second portion can be curved.
• the internal surface of the screen can be curved so as to include at least a first portion and a second portion which are at different distances from the combustion surface.
• the screen is distant from the burner plate, for example at least 1mm, and preferably at least 2mm.
• FIG. 1 is a partial perspective section of an infrared radiation emitter with a screen according to the prior art
• FIG. 2 is a schematic perspective representation of a first embodiment of a screen according to the invention for an infrared radiation emitter
• FIG. 3 is a schematic representation of a cross section of the screen shown in Figure 2,
• Figure 4 is a schematic representation of a cross section of an infrared radiation emitter equipped with the screen shown in Figure 2,
• Figure 5 is a schematic representation of a cross section of a second embodiment of the screen according to the invention.
• FIG. 6 is a schematic representation of a cross section of an infrared radiation emitter equipped with the screen shown in Figure 5, and [0039] [Fig. 7] FIG. 7 is a schematic perspective representation of a third embodiment of a screen according to the invention for an infrared radiation emitter.
• FIG. 1 represents a gas-heated infrared radiation emitter 1, comprising a screen 2 according to the prior art, for example in the form of a metal grid or of braided metal wires.
• the transmitter 1 comprises a frame 4 with a supply inlet 6 for the gases to be burnt, and a burner plate 8 disposed opposite the internal surface of the screen 2.
• the frame 4 and the plate burner 8 delimit an interior chamber into which are routed the gases entering through the supply inlet 6.
• the burner plate 8 may for example be a perforated ceramic plate, the perforations of which are intended to allow the gases present in the inner chamber of the emitter 1 to exit. On leaving the perforations, the gases are then burned on the external surface 10, or combustion surface, of the burner plate 8 when there is a flame, and then come to heat the screen 2 arranged opposite the external surface. 10.
• the burner plate 8 may include an outer surface 10 crenellated, or ridged.
• the burner plate 8 can have, at the level of the external surface 10, different levels of combustion surface, for example two.
• the outer surface 10 may for example comprise parallel ridges arranged obliquely over the entire surface of the burner plate 8.
• FIGS. 3 to 6 schematically illustrates the general shape of a screen according to the present invention.
• the screen is formed by a material with mesh or open pores, and may comprise silicon carbide, preferably silicon infiltrated.
• the screen can be formed by a material having a structure resulting from the repetition, in the three directions of space, of the same elementary geometric pattern, as illustrated schematically in FIGS. 3 to 6, or else can be formed from a foamed material.
• a screen made of mesh material is described in particular in document WO 2017/156440.
• the surface of the meshed material is considered to be the (fictitious) plane in which the end edges or end vertices of the meshed material are located.
• the bottom surface of the material will correspond to the plane in which the lower end ridges or lower end vertices of the mesh material lie.
• FIG. 2 therefore illustrates the geometric shape of a screen according to the present invention, by showing its outlines by planes. More precisely, FIG. 2 illustrates a screen whose surface intended to face the burner plate, that is to say the internal surface, is shown.
• the screen 12 does not have a flat internal surface, but instead comprises an internal surface 14 with a first main portion 16 and at least a second portion 18 disposed recessed relative to the first portion 16.
• the screen 12 thus comprises two second portions 18.
• the surface of the second portions 18 is offset from the surface of the first portion 16, and is located below the surface of the first portion 16.
• the screen 12 thus has a geometric shape in which the internal surface 14 has two hollows or recesses.
• the second portions 18 may be flat, like the first portion 16, and may be parallel to the first portion 16.
• Figure 3 illustrates a section of the screen 12 shown schematically in Figure 2.
• the screen 12 has a planar outer surface 20 which is opposite and parallel to the inner surface 14.
• the screen 12 then has a thickness which is greater at the level of the first portion 16 than at the level second portions 18.
• the difference in thickness of the screen 12 between the first portion 16 and the second portions 18 of the internal surface 14 can be between 0.5mm and 10mm, preferably between 1mm and 5mm.
• Such a difference in thickness can correspond to a multiple of the thickness of an elementary geometric element of the mesh material.
• FIG. 4 represents an infrared radiation emitter 1 comprising a screen 12 as illustrated in FIGS. 2 and 3.
• the emitter 1 comprises in particular a frame 4 and a combustion surface.
• the combustion surface of the emitter 1 is formed by two burner plates 8a, 8b arranged adjacent to form a continuous combustion surface.
• the screen 12 is disposed opposite the burner plates 8a, 8b, with the internal surface 14 facing the combustion surface.
• the screen 12 is not arranged directly on the burner plates 8a, 8b, but at a distance, for example the first portion 16 can be located at least 1mm from the burner plates 8a, 8b, preferably at least 2mm .
• the proximity of the screen 12 can lead, in use, to “unhooking” the flame from the combustion surface and therefore to extinguishing the transmitter 1, in particular during ignition.
• the screen 12 includes the second portions 18 which, as they are set back from the first portion 16, are even further away from the burner plates 8a, 8b. It then becomes easier and easier to maintain the flame on the combustion surface at least at the level of the second portions 18.
• the second portion 18 therefore makes it possible to maintain the operation of the transmitter 1, in particular on ignition.
• the second portions 18 are provided with reduced dimensions.
• the total surface of the second portions 18 can be between 1% and 70% of the total surface of the internal surface, preferably between 5% and 50% and more preferably between 10% and 30%.
• the second portions 18 can be provided facing the hottest surface of the burner plates 8a, 8b, that is to say facing the center of the burner plates 8a, 8b.
• the hottest surfaces of the burner plates are the surfaces which deteriorate the most quickly and which are most likely, over time, to prevent the correct operation of the transmitter.
• the second portions 18 facing the hottest areas of the burner plates 8a, 8b, it becomes possible to extend the life of the transmitter.
• the second portions 18 can be provided facing a peripheral part of the burner plates 8a, 8b, for example in a peripheral part of the internal surface 14 of the screen.
• Figures 5 and 6 illustrate a second embodiment of the invention.
• the transmitter comprises only one burner plate 8.
• a second portion 18 is provided in the screen 12, and is disposed opposite the center of the burner plate. 8.
• the second portion 18 can also be arranged facing a peripheral part of the burner plate 8, for example on a peripheral part of the internal surface of the screen such as a corner or an edge of the. internal surface of the screen.
• FIG. 7 illustrates a third embodiment of the invention. More precisely, FIG. 7 illustrates a screen whose surface intended to face the burner plate, that is to say the internal surface, is shown.
• the screen 12 ' accordinging to the third embodiment of the invention does not have a flat internal surface, but instead comprises an internal surface 14 with a first main portion 16 and a second portion 18 'set back relative to the first portion 16.
• the screen 12' thus comprises a single second portion 18 '.
• the second portion 18 ' is positioned on the periphery of the internal surface 14, in this case in a corner.
• the surface of the second portion 18 ' is offset with respect to the surface of the first portion 16, and is located below the surface of the first portion 16.
• the screen 12' thus has a geometric shape in which the internal surface 14 has a hollow or recess on the periphery.
• the screen 12 ' is illustrated with a single second portion 18' but can obviously include several, arranged at the corners and / or edges of the internal surface 14.
• the second portion 18 ' can be flat, like the first portion 16, and can be parallel to the first portion 16.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Gas Burners (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=69468881

Family Applications (1)

Country Status (7)

Family Cites Families (12)

• 2019
  • 2019-11-15 FR FR1912779A patent/FR3103260B1/fr active Active
• 2020
  • 2020-11-06 EP EP20800666.8A patent/EP4058730B1/de active Active
  • 2020-11-06 ES ES20800666T patent/ES3021689T3/es active Active
  • 2020-11-06 CN CN202080079419.4A patent/CN114667416A/zh active Pending
  • 2020-11-06 BR BR112022009379A patent/BR112022009379A2/pt unknown
  • 2020-11-06 WO PCT/EP2020/081356 patent/WO2021094225A1/fr not_active Ceased
  • 2020-11-06 US US17/776,308 patent/US12287090B2/en active Active

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