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
  • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
• • 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
  • F23D2213/00—Burner manufacture specifications
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
  • F23D2900/00003—Fuel or fuel-air mixtures flow distribution devices upstream of the outlet
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
  • F23D2900/00019—Outlet manufactured from knitted fibres

Definitions

• the invention relates to the field of premix gas burners, more specifically to the field of premix gas burners that have a woven wire mesh acting as burner deck.
• WO2018/050310A1 discloses a premix gas burner comprising a metal mounting plate, a burner deck and a metal plate structure.
• the metal mounting plate has a plain section for mounting the burner in a heating appliance.
• the burner deck comprises a woven wire mesh onto which the flames are stabilized when the burner is in use. At least part of the metal plate structure is perforated for the premix gas to flow through the perforations before the premix gas flows through the woven wire mesh.
• the metal mounting plate has an opening.
• the woven wire mesh is inserted through the opening of the metal mounting plate.
• the woven wire mesh is bent, such that a flange parallel with the plain section of the metal mounting plate is provided.
• the flange is held between the metal mounting plate and the metal plate structure such that play is present of the flange relative to the metal mounting plate and relative to the metal plate structure.
• the metal mounting plate is welded to the metal plate structure.
• the first aspect of the invention is a premix gas burner comprising a metal mounting plate, a burner deck, a metal plate structure, and a gas mixing chamber.
• the metal mounting plate comprises a plain section for mounting the burner in a heating appliance.
• the burner deck comprises - and preferably consists out of - a woven wire mesh onto which the flames are stabilized when the burner is in use.
• At least part of the metal plate structure is perforated for the premix gas to flow from the gas mixing chamber through the perforations of the metal plate structure before the premix gas flows through the woven wire mesh.
• the metal mounting plate has an opening. The woven wire mesh is inserted from the gas mixing chamber through the opening of the metal mounting plate.
• the metal plate structure is inserted from the gas mixing chamber through the opening of the metal mounting plate.
• the woven wire mesh is bent such that a flange is provided along at least part of the circumference of the woven wire mesh.
• the flange of the woven wire mesh is along the circumference of the porous burner deck split in a plurality of flange segments.
• the opening of the metal mounting plate comprises two parallel linear sides.
• the metal mounting plate comprises a plurality of lips at its inner circumference around the opening. The lips are folded over and grab into notches, slots or openings in the metal plate structure thereby clamping the metal plate structure firmly onto the metal mounting plate.
• the metal mounting plate comprises upstanding ridges providing supporting elements onto which the metal plate structure is clamped by the lips of the metal mounting plate.
• the upstanding ridges of the metal mounting plate fit into openings between segments of the flange of the woven wire mesh, such that the flange is held between the metal mounting plate and the metal plate structure with play of the flange relative to the metal mounting plate and relative to the metal plate structure.
• the lips are provided on the upstanding ridges.
• Such arrangement provides a more simple way of assembly of the burner.
• the metal mounting plate is seamless and made from a single metal plate.
• the metal plate structure is made from a single metal plate; more preferably the metal plate structure does not comprise welds. Even more preferably, the metal plate structure is seamless.
• the lips are only provided along the two parallel linear sides of the
• the flange of the woven wire mesh is provided parallel with the plain section of the metal mounting plate.
• the metal mounting plate and the metal plate structure are not welded to each other. This way, thermal stress concentrations and thermally induced changes of material properties - e.g. reduced corrosion resistance - are prevented.
• the woven wire mesh has a thickness between 0.6 and 1 .3 mm.
• a woven wire mesh of 0.9 mm thickness can be advantageously used in the invention.
• the metal plate structure is along at least 80% - and more preferably along at least 90%, even more preferably along 100% - of the length of each of the two parallel linear sides bent around the flange of the woven wire mesh such that the metal plate structure contacts the plain section of the metal mounting plate along a line or a plane.
• Such embodiments have particular benefits.
• the contact of the metal plate structure to the metal mounting plate along a line or a plane ensures that no premix gas can flow along the metal plate structure - instead of through the perforations of the metal plate structure - and around the metal wire mesh through the opening in the metal mounting plate.
• Such flow - which is a leakage flow - of premix gas would be combusted on the metal wire mesh.
• the embodiment effectively prevents such leakage flows, and therefore, provides a premix gas burner with more reliable ionization current measurement, especially at low burner load, and a higher life time expectance.
• the line or plane contact between the metal plate structure and the plain section of the metal mounting plate along the two parallel linear sides is only interrupted at the notches, slots or openings in the metal plate structure through which the lips grab. More preferably, the line or plane contact between the metal plate structure and the plain section of the metal mounting plate is provided along the full length of the two parallel linear sides.
• the opening of the metal mounting plate comprises a rectangular shape.
• the two long sides of the rectangular shape are provided by the two parallel linear sides.
• the short sides of the rectangular shape can be - preferably continuously - rounded.
• the metal plate structure has a flange along the two short sides of the rectangular shape of the opening of the metal mounting plate.
• the metal mounting plate has an upstanding ridge along the two short sides of the rectangular shape.
• the flange of the metal plate structure along the two short sides of the rectangular shape contacts the upstanding ridge of the metal mounting plate along the two short sides of the rectangular shape. More preferably, the flange of the metal plate structure along the two short sides of the rectangular shape contacts the edge of the upstanding ridge of the metal mounting plate along the two short sides of the rectangular shape.
• the porous burner deck is provided in a convex shape. More preferably, the porous burner deck is provided in a convex shape over the full surface of the porous burner deck provided for stabilizing the flames.
• the porous burner deck has a double curved surface.
• a surface is at a point on it double curved, there is at that point no direction in which the radius of curvature at that point is infinite.
• a cylindrical burner is a burner that has a single curved surface, not a double curved surface.
• the flange of the woven wire mesh is only provided along the long sides of the rectangular circumference of the woven wire mesh. Such embodiments provide burners with longer lifetime.
• the flange is only provided to the woven wire mesh along the long sides of the rectangular circumference of the woven wire mesh: it is meant that the woven wire mesh does not comprise flanges along the two - preferably continuously - rounded short sides of the rectangular circumference of the woven wire mesh.
• the bend angle providing the flange of the woven wire mesh is preferably at least 90°.
• a second aspect of the invention is a heat cell comprising a heat exchanger and a premix gas burner as in the first aspect of the invention.
• the heat exchanger comprises a combustion chamber.
• the premix gas burner is provided in the combustion chamber for the generation of flue gas for heat transfer from the flue gas to a fluid flowing through the heat exchanger.
• the heat exchanger is an aluminium heat exchanger, even more preferably a cast aluminium heat exchanger.
• the heat cell can be used in a boiler; e.g. a boiler in a central heating installation.
• Figure 1 shows a top view of a gas premix burner according to the invention.
• Figure 2 shows a bottom view of the burner of figure 1.
• Figure 3 shows a view on the burner along II - II of figure 2.
• Figure 4 shows the woven wire mesh forming the porous burner deck of the burner of figure 1.
• Figure 5 shows the metal mounting plate of the burner of figure 1 before assembly in the burner.
• Figure 6 shows the metal plate structure as included in the burner of figure 1.
• Figure 7 shows a view on the burner along VII-VII of figure 2.
• Figures 1 - 7 show in combination an example of a gas premix burner according to the invention.
• Figure 1 shows a top view 100 of a gas premix burner according to the invention.
• Figure 2 shows a bottom view 200 of the burner of figure 1.
• Figure 3 shows a view on the burner along II - II of figure 2.
• Figure 4 shows the woven wire mesh forming the porous burner deck of the burner of figure 1.
• Figure 5 shows the metal mounting plate 102 of the burner of figure 1 before its assembly in the burner.
• Figure 6 shows the metal plate structure 106 as included in the burner of figure 1.
• Figure 3 shows a view on the burner along VII - VII of figure 2.
• the premix gas burner comprises a metal mounting plate 102, a woven wire mesh 110 providing the burner deck, a metal plate structure 106 and a gas mixing chamber 108.
• the metal mounting plate comprises a plain section 107 for mounting the burner in a heating appliance.
• the burner deck consists out of a woven wire mesh onto which the flames are stabilized when the burner is in use.
• the porous burner deck is provided in a convex shape over its full surface.
• the circumference of the woven wire mesh has the shape of a rectangle of which the two short sides have been continuously rounded.
• the metal plate structure 106 comprises a plurality of perforations 1 12 for flow of premix gas from the gas mixing chamber 108 through the perforations of the metal plate structure before the premix gas flows through the porous burner deck.
• the woven wire mesh is inserted from the gas mixing chamber through the opening 1 1 1 of the metal mounting plate.
• the opening 1 1 1 in the metal mounting plate has a rectangular shape, of which the two long sides of the rectangular shape are provided by the two parallel linear sides. The short sides of the rectangular shape are continuously rounded.
• the metal plate structure is inserted from the gas mixing chamber through the opening of the metal mounting plate. The metal mounting plate and the metal plate structure are not welded to each other.
• the woven wire mesh 1 10 is bent such that a flange 122 is provided along the long sides of the rectangular circumference of the woven wire mesh.
• the flange is split in a number of flange segments. Openings 124 are provided between flange segments.
• the flange of the woven wire mesh is provided parallel with the plain section 107 of the metal mounting plate.
• the opening of the metal mounting plate comprises two parallel linear sides.
• the metal mounting plate comprises a plurality of lips 1 16 at its inner circumference around the opening 1 1 1. Lips are only provided along the two parallel linear sides of the
• the metal plate structure comprises a plurality of openings 1 18 and a flange 120 at the circumference of the metal plate structure.
• the lips 1 16 of the metal mounting plate are folded over and grab into the openings 1 18 in the metal plate structure thereby clamping the metal plate structure firmly onto the metal mounting plate.
• Figure 5 shows the metal mounting plate, with the lips 1 16, before assembly in the burner. The lips 1 16 are folded towards the inside of the burner during assembly of the burner.
• the metal mounting plate comprises upstanding ridges 126 providing supporting
• the lips 1 16 are provided on the upstanding ridges 126.
• the lips 1 16 clamp the flange segments of the metal plate structure onto the upstanding ridges 126; this way the metal plate structure is firmly clamped onto the metal mounting plate.
• the arrangement is such that only clamping (only lips folded over to act as clamps) is provided along the long sides of the rectangular cross section of the opening of the metal mounting plate. Such arrangement facilitates the manufacturing operation.
• the upstanding ridges 126 of the metal mounting plate fit into the openings 124 between segments of the flange of the woven wire mesh.
• the height of the upstanding ridges 126 determines the space between the metal mounting plate and the metal plate structure.
• This distance is selected to be larger than the thickness of the woven wire mesh burner deck, such that the flange segments are present between the metal mounting plate and the metal plate structure such that play is present between the flange segments on the one hand; and the metal mounting plate and the plate structure on the other hand.
• the flange of the woven wire mesh is held between the metal mounting plate and the metal plate structure such that play is present of the flange relative to the metal mounting plate and relative to the metal plate structure. Consequently, the woven wire mesh burner deck can efficiently cope with thermal expansion and contraction.
• the metal plate structure is bent around the flange of the woven wire mesh such that the metal plate structure contacts the plain section of the metal mounting plate along a line 138.
• the metal plate structure has a flange along the two continuously rounded short.
• the metal mounting plate has an upstanding ridge 142 along the two continuously rounded short sides of the rectangular shape of the opening in the metal mounting plate.
• the flange of the metal plate structure 120 contacts the upstanding ridge of the metal mounting plate along the two short sides of the rectangular shape.

Landscapes

• 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 (3)

Publications (1)

Family

ID=65995763

Family Applications (1)

Country Status (2)

Family Cites Families (4)

• 2019
  • 2019-04-03 EP EP19714669.9A patent/EP3781865A1/de not_active Withdrawn
  • 2019-04-03 WO PCT/EP2019/058360 patent/WO2019201599A1/en active Application Filing

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