Classifications

• • 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
  • F24C3/002—Stoves
  • F24C3/006—Stoves simulating flames

Definitions

• the present invention relates to a gas burner of the so-called "living flame” type, ie. a gas burner whose flames carry to a certain degree of glowing artificial logs or charcoal.
• the gas burner is essentially constituted by a combustion chamber in which the fuel (gas) / oxidizer (primary air) mixture circulates, having at its upper part a flat sheet metal intended to receive a artificial fuel, said sheet having holes for the passage of said fuel / oxidizer mixture arranged at the limit of the aforementioned flat sheet, near the zone in which the secondary air circulates.
• the aforementioned holes are located in a marginal zone along the outer perimeter of the aforementioned flat sheet.
• the aforementioned holes are located at the limit on the one hand of the outer perimeter of the aforementioned sheet and on the other hand of the inner perimeter of the aforementioned orifice.
• the aforementioned holes have a diameter such that, taking into account the pressure prevailing in the aforementioned chamber, the richness in primary air of the fuel / oxidizer mixture, the flashback phenomenon is rendered impossible.
• Figures 1 and 2 are plan views of the burner according to the invention, in a first embodiment.
• Figure 3 is a perspective view, in a schematic embodiment, showing the path that the fuel / oxidizer mixture can follow in the burner chamber.
• Figure 4 shows, on a larger scale and in a cross section conducted in a vertical plane, the manner in which the flames of the burner are curved under the effect of secondary air currents.
• FIGS 4 and 5 schematically illustrate the flame curving process towards the artificial fuel.
• the objective being to deflect the flames of these burners by making use of an ascending secondary air current, this is achieved in living flame burners which essentially consist of a chamber 1 (fig. 3) in which the fuel (gas) / oxidant (primary air) mixture circulates, and a flat upper plate 2 (fig. 1 and 2) drilled with holes 3 - 3 '(fig. 1 and 2) allowing the supply of the flame.
• the flame must be deflected in the direction of logs or blocks of artificial fuel to carry at least locally incandescent artificial fuel placed on the flat sheet or in its vicinity (fig. 4 and 5). In the spirit of the invention, this can be obtained by making the holes 3 (fig. 1 and 2) at the very limit of the flat sheet 2 (fig.
• the burner is represented by the general reference 4, the artificial fuel by the reference 5 and a flame bundle by the reference 6.
• the updraft of secondary air is represented in this same figure by two arrows.
• the same phenomenon is observed when the burner is of the type represented in FIGS. 1 and 2.
• the burner according to FIG. 2 has a topological surface of a type greater than one.
• the flat sheet 2 of the burner according to these two figures has two orifices 7 which results in a significant elongation of the perimeter corresponding to the area in which the holes 3 - 3 'are formed (fig. 2).
• the total perimeter consists of the convex perimeter arising from the geometric shape of the flat sheet 1 (fig. 1 and 2) plus the concave perimeter of one or more orifices 7 (fig. 2).
• FIG. 5 where the burner is represented by the reference 4 and the fuel by the reference 5.
• the zone A shows how the secondary air curves the flame towards the horizontal .
• This zone A is followed by a zone B where gravity straightens the flame and causes localized instability and an aspect of chaos determining the spatial distribution of the flame if it is long enough to escape freely over the fuel. Consequently, the transition from the laminar flow zone to the transient pseudoturbulence takes place with a lower gas flow rate than in an axial diffusion flame or with a symmetry with respect to a vertical plane.
• the design of the burner according to the invention allows a very flexible distribution of the flames which gives complete freedom to choose the necessarily clear passage of the flames in the fireplace decoration according to the desired aesthetics.
• any interior point i.e. any point inside chamber 1 (fig. 3) can be reached by two different paths.
• this point represented by the letter P can, from the venturi 8 through which the fuel (gas) / oxidizer (primary air) mixture is reached, be reached by one of the three paths designated by one of the references 9, 10 or 11.
• the dynamic pressure of the mixture inside the burner is very easily homogenized at all flow rates, i.e. at all power regimes since the mixture is never blocked or trapped in one or the other "dead end" where the kinetic energy could be transformed into high static pressure.
• the heterogeneity of the pressure of the mixture inside the burner would indeed create a heterogeneity of the speeds of ejection of this mixture in the direction of the flames, which would cause delamination in an excess air situation (blue flame) and a sooty stretch in a situation without excess air (yellow flame).
• the burner shown in Figures 1 and 2 has a hexagonal periphery.
• This periphery could have 3, 4, 5, 7, 8 sides or, generally, n sides, or have a circular or oval outline.

Landscapes

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

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=3889156

Family Applications (1)

Country Status (15)

Cited By (1)

Citations (4)

• 1995
  • 1995-09-04 BE BE9500732A patent/BE1009563A6/fr not_active IP Right Cessation
• 1996
  • 1996-09-03 ZA ZA967447A patent/ZA967447B/xx unknown
  • 1996-09-04 AT AT96929142T patent/ATE186978T1/de active
  • 1996-09-04 JP JP9510712A patent/JPH11514427A/ja active Pending
  • 1996-09-04 ES ES96929142T patent/ES2141527T3/es not_active Expired - Lifetime
  • 1996-09-04 AU AU68668/96A patent/AU6866896A/en not_active Abandoned
  • 1996-09-04 EP EP96929142A patent/EP0848796B1/fr not_active Expired - Lifetime
  • 1996-09-04 IL IL12352696A patent/IL123526A/xx not_active IP Right Cessation
  • 1996-09-04 AR ARP960104230A patent/AR003505A1/es unknown
  • 1996-09-04 RU RU98105964/03A patent/RU2155913C2/ru active
  • 1996-09-04 DE DE69605313T patent/DE69605313T2/de not_active Expired - Fee Related
  • 1996-09-04 WO PCT/BE1996/000092 patent/WO1997009568A1/fr active IP Right Grant
  • 1996-09-04 CA CA002233886A patent/CA2233886A1/fr not_active Abandoned
• 1998
  • 1998-02-27 IS IS4678A patent/IS4678A/is unknown
  • 1998-03-04 NO NO980943A patent/NO308679B1/no not_active IP Right Cessation

Patent Citations (4)

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