EP0679838B1 - Verbesserungen an Gasbrennern - Google Patents

Verbesserungen an Gasbrennern Download PDF

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Publication number
EP0679838B1
EP0679838B1 EP19950400939 EP95400939A EP0679838B1 EP 0679838 B1 EP0679838 B1 EP 0679838B1 EP 19950400939 EP19950400939 EP 19950400939 EP 95400939 A EP95400939 A EP 95400939A EP 0679838 B1 EP0679838 B1 EP 0679838B1
Authority
EP
European Patent Office
Prior art keywords
perforated wall
supply
burner according
perforated
hollowed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19950400939
Other languages
English (en)
French (fr)
Other versions
EP0679838A1 (de
Inventor
Rédouane Oumghari
Albert Quere
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chaffoteaux et Maury SAS
Original Assignee
Chaffoteaux et Maury SAS
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Publication of EP0679838A1 publication Critical patent/EP0679838A1/de
Application granted granted Critical
Publication of EP0679838B1 publication Critical patent/EP0679838B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/045—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with a plurality of burner bars assembled together, e.g. in a grid-like arrangement
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits

Definitions

  • the invention relates to gas burners, and more especially those who have at least one bedroom distribution which is intended to receive air and a combustible gas, and which is partially delimited by a thin perforated wall constituting a combustion ramp and forming a downstream end of the distribution chamber, this distribution chamber further comprising a upstream end with a plurality of supply ports arranged opposite the perforated wall and supplying the air and gas distribution chamber, the wall perforated with perforated areas which are not located directly opposite a supply port.
  • Such a gas burner is disclosed for example in document FR-A-2 695 457.
  • burners are intended in particular to equip heating and hot water devices domestic gas-fired, whose nominal power does not exceed 70 kW thermal.
  • the invention applies more particularly, but not exclusively, to atmospheric type gas burners.
  • Gas burners of the kind mentioned above have the disadvantage that the sheet of flames which develops above the perforated wall in areas that are not located directly opposite an orifice feeding, tends to remain "stuck" to the wall perforated, because the speed of the gas premix coming out of the perforated wall is relatively small in these areas.
  • This phenomenon can cause local overheating of the perforated wall, up to carrying it to the red. These overheating may cause deterioration of the perforated wall, due to its thinness.
  • flames may tend to form inside the distribution chamber, which can make the operation of the burner dangerous.
  • the object of the present invention is in particular to remedy these drawbacks.
  • said zones perforated from the perforated wall which are not located directly opposite a supply orifice constitute parts dug towards the upstream end of the distribution chamber.
  • the burner shown in Figures 1 to 3 is atmospheric type, and has five combustion ramps juxtaposed, of which only one is represented.
  • the feeders 6 of the burner are each supplied from a source of pressurized combustible gas 7, via pipelines 8 and valves 9 specific to each nurse.
  • each valve 9 can work in all or nothing, as disclosed for example in the aforementioned document FR-A-2 695 475, so that each combustion rail is always supplied with a flow of optimal gas.
  • the perforated wall 2 can be produced for example stainless steel and has many perforations in the form of parallel rectilinear slits arranged perpendicularly to the longitudinal direction of said wall perforated.
  • slots represent for example a proportion of the upper surface of the perforated wall 2 which is more than 30%, and which can be worth for example around 35 %.
  • the perforated wall 2 has good transparency to the thermal radiation emitted by the flames F formed above it, which lowers the temperature of flames.
  • This high density of perforations also allows a better distribution of the layer of flames above the perforated plate, with a surface power preferably less than 250 W / cm 2 , which contributes to reducing the temperature of the perforated wall. Furthermore, the high density of the perforations is also favorable for reducing the pressure losses in the gas flow.
  • the perforated wall 2 has two laterally longitudinal edges 2b folded vertically towards the support plate 3.
  • the perforated wall 2 can fit onto the support plate 3 overlapping it and the horizontal part of the wall 2 rests on the face upper of the support plate 3 on the periphery of the recess 3a of this plate. This assembly allows a sufficient seal between the perforated wall 2 and the plate support 3.
  • the perforated wall 2 has stamped parts 2a which are hollowed out or curved towards the inside of the chamber spread 1 above each portion of the baking sheet support 3 which separates two bores 3a, 3b.
  • these stamped parts can have a cylindrical shape, possibly with a cross-section arc of a circle or V, having an axis perpendicular to the plane vertical common to the vertical axes of the venturis tubes.
  • This provision compensates for the non uniformity of the speed field of the outgoing gas premix of the perforated wall 2, and prevents the sheet of flames F remains stuck to the perforated wall 2 between two venturis tubes.
  • the speed of the gas premix leaving the perforated wall 2 is weaker between the outlets of two venturis tubes 4, so that without the parts stamped 2a, the flame sheet F would tend to form in contact with the perforated wall 2 in these locations, even to go inside the room of distribution 1 with certain types of combustible gas.
  • the formation of flames F in contact with the wall perforated may cause local overheating of the perforated wall 2, overheating which can cause deterioration of the perforated wall due to its thinness.
  • the support plate 3 has a thickness e, below distribution chamber 1, which can be higher at 8 mm, and for example between 8 and 15 mm. This plate is therefore massive enough to support without damage the thermal energy it receives by conduction of the perforated wall 2, and by radiation of the flames and the perforated wall 2. In addition to its functions of mechanical and sealing connection between the venturis tubes and the perforated wall, this support plate thus ensures a thermal absorption and diffusion function.
  • the support plate 3 can be treated, at least in the part of its surface which is arranged opposite the perforated wall 2, so that it has a good coefficient absorption of thermal radiation.
  • the surface of the massive plate 3 can be treated so that it has a dark color (especially by means a special paint, by means of anodization, or by means of an oxidation), and / or so that it presents a rough wall.
  • the bores 3b of the plate support 3 occupy a fairly large proportion of the support plate surface.
  • these bores 3b may have a diameter D substantially equal to the width of the recess 3a of the support plate and the spacing d between two successive bores 3b of the support plate can be for example less than the half this diameter D.
  • Venturis tubes 4 can be produced by example stainless steel or aluminized steel, and they absorb radiation from their inner surface thermal from the layer of flames above from the perforated wall 2, and also coming from the wall perforated itself.
  • venturis tubes 4 receive heat by conduction from the support plate 3.
  • venturis tubes 4 The heat received by radiation or by conduction through the venturis tubes 4 is transmitted to the air flow and combustible gas which passes through these venturis tubes. Possibly, to increase this heat exchange with gas flow, it is possible to perform axial fins (not shown) inside the tubes venturis.
  • the tubes venturis 4 can each be made by assembling half-shells 4a, 4b, in stamped sheet metal, these two half-shells being tightly assembled one against the other, in particular by crimping or welding.
  • the upper parts of the half-shells 4a, 4b are received in a 3d groove formed partly longitudinally of the support plate 3, and in the parts enlarged 3c bores 3b.
  • the plate support 3 may possibly be common to the different burner combustion ramps, so as to form a monobloc assembly.
  • the support plate 3 can have longitudinal grooves in the upper part 3f which receive the folded longitudinal edges of the walls perforated 2. This arrangement reduces the cost of burner and simplify its realization, and facilitates in in addition to the diffusion of heat by the support plate common 3, all the more so as all the combustion ramps of the burner are not necessarily simultaneously in operation.
  • the support plate 3 can be similar to that of the figure 4 and be equipped with a perforated wall 2 also common to the different combustion ramps.
  • This perforated wall 2 may optionally have longitudinal folds parallels 2c which penetrate into the grooves 3f of the support plate 3, to achieve sufficient sealing between the distribution chambers 1 of the different ramps combustion.
  • the plate support 3 of each combustion rail could be tightly connected to the upper part of a chamber receiving a mixture of air and pressurized combustible gas, the burner then being supply air type.
  • each ramp of combustion of the burner according to the invention could possibly include a piece of non-massive sheet metal, possibly water cooled.
  • each burner burner rail may not have an intermediate part between the venturis tubes 4 and the perforated wall 2, the venturis tubes then being produced for example as disclosed in document FR-A-2 695 475 by assembling two stamped sheets common to all venturis tubes, these stamped sheets also forming the side walls and the bottom of the distribution chamber 1.

Landscapes

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

Claims (9)

  1. Gasbrenner mit wenigstens einer Verteilerkammer (1) zur Aufnahme von Luft und einem Brenngas, die teilweise von einer dünnen, perforierten Wand (2) begrenzt wird, welche eine Brennrampe und ein nachgeordnetes Ende der Verteilerkammer bildet, wobei diese Verteilerkammer weiterhin ein vorgeordnetes Ende umfaßt, das mit einer Mehrzahl von gegenüber der perforierten Wand (2) angeordneten und der Verteilerkammer (1) Luft und Gas zuführenden Zuführöffnungen (3b) versehen ist, wobei die perforierte Wand (2) perforierte Bereiche (2a) aufweist, die nicht unmittelbar gegenüber einer Zuführöffnung (3b) angeordnet sind,
    dadurch gekennzeichnet, daß die perforierten Bereiche der perforierten Wand, die nicht unmittelbar gegenüber einer Zuführöffnung (3b) angeordnet sind, zum vorgeordneten Ende der Verteilerkammer (1) hin vertiefte Abschnitte (2a) bilden.
  2. Brenner nach Anspruch 1, bei welchem die Zuführöffnungen (3b) in Längsrichtung fluchtend angeordnet sind und die vertieften Abschnitte (2a) der perforierten Wand zwischen den Zuführöffnungen (3b) angeordnet sind.
  3. Brenner nach Anspruch 2, bei welchem die vertieften Abschnitte (2a) der perforierten Wand eine im wesentlichen zylindrische Form mit zu der perforierten Wand paralleler und zur Fluchtrichtung der Zuführöffnungen (3b) senkrechter Achse aufweisen.
  4. Brenner nach Anspruch 3, bei welchem die vertieften Abschnitte (2a) eine zylindrische Form mit abgerundetem Querschnitt aufweisen.
  5. Brenner nach Anspruch 3, bei welchem die vertieften Abschnitte (2a) eine zylindrische Form mit im wesentlichen V-förmigem Querschnitt aufweisen.
  6. Brenner nach einem der vorhergehenden Ansprüche, bei welchem die perforierte Wand (2) außerhalb der vertieften Abschnitte (2a) eine im wesentlichen ebene Form aufweist und bei welchem die Zuführöffnungen (3b) in einer gemeinsamen, zu der perforierten Wand (2) parallelen Ebene angeordnet sind.
  7. Brenner nach einem der vorhergehenden Ansprüche, bei welchem jede Zuführöffnung (3b) mit einer Zuführleitung (4) verbunden ist, die wenigstens im Bereich der Zuführöffnung (3b) eine zu der perforierten Wand (2) im wesentlichen senkrechte Achse aufweist.
  8. Brenner nach Anspruch 7, bei welchem die Zuführleitungen Venturirohre (4) bilden, denen jeweils von einer Düse (5) Brenngas zugeführt wird.
  9. Brenner nach Anspruch 8 bei welchem die verschiedenen Venturirohre (4) geradlinige, parallele und koplanare Achsen aufweisen.
EP19950400939 1994-04-29 1995-04-26 Verbesserungen an Gasbrennern Expired - Lifetime EP0679838B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9405242A FR2719361B1 (fr) 1994-04-29 1994-04-29 Perfectionnements aux brûleurs à gaz.
FR9405242 1994-04-29

Publications (2)

Publication Number Publication Date
EP0679838A1 EP0679838A1 (de) 1995-11-02
EP0679838B1 true EP0679838B1 (de) 1998-03-04

Family

ID=9462687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950400939 Expired - Lifetime EP0679838B1 (de) 1994-04-29 1995-04-26 Verbesserungen an Gasbrennern

Country Status (3)

Country Link
EP (1) EP0679838B1 (de)
DE (1) DE69501673T2 (de)
FR (1) FR2719361B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004111536A1 (en) 2003-06-19 2004-12-23 Worgas Bruciatori S.R.L. Burner with diffuser resistant to high operating temperatures
WO2017092026A1 (zh) * 2015-12-04 2017-06-08 深圳智慧能源技术有限公司 引射式燃烧装置及其燃料控制系统
CN109681868B (zh) * 2018-09-30 2021-05-25 浙江绍兴苏泊尔生活电器有限公司 一种燃烧器的制造方法、燃烧器和燃气灶

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2105026B (en) * 1981-07-24 1985-03-27 Furigas An atmospheric gas burner
FR2695457B1 (fr) * 1992-09-08 1994-11-04 Chaffoteaux Et Maury Perfectionnements aux brûleurs atmosphériques à gaz.

Also Published As

Publication number Publication date
DE69501673D1 (de) 1998-04-09
EP0679838A1 (de) 1995-11-02
DE69501673T2 (de) 1998-10-22
FR2719361B1 (fr) 1996-07-12
FR2719361A1 (fr) 1995-11-03

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