EP0125965A1 - Burner for gaseous fuel incorporating ignition and safety systems - Google Patents

Burner for gaseous fuel incorporating ignition and safety systems Download PDF

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Publication number
EP0125965A1
EP0125965A1 EP84400831A EP84400831A EP0125965A1 EP 0125965 A1 EP0125965 A1 EP 0125965A1 EP 84400831 A EP84400831 A EP 84400831A EP 84400831 A EP84400831 A EP 84400831A EP 0125965 A1 EP0125965 A1 EP 0125965A1
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EP
European Patent Office
Prior art keywords
burner
burner body
cap
grooves
burner according
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.)
Granted
Application number
EP84400831A
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German (de)
French (fr)
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EP0125965B1 (en
Inventor
Jacques François Pistien
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.)
Engie SA
Original Assignee
Gaz de France SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gaz de France SA filed Critical Gaz de France SA
Priority to AT84400831T priority Critical patent/ATE35451T1/en
Publication of EP0125965A1 publication Critical patent/EP0125965A1/en
Application granted granted Critical
Publication of EP0125965B1 publication Critical patent/EP0125965B1/en
Expired legal-status Critical Current

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    • 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
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/725—Protection against flame failure by using flame detection devices
    • 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
    • F23D14/06—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 radial outlets at the burner head
    • F23D14/065—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 radial outlets at the burner head with injector axis inclined to the burner head axis

Definitions

  • the present invention relates generally to burners for gaseous fuels, in particular for cooking appliances, equipped with ignition and extinguishing safety devices.
  • the invention relates more particularly to a burner for gaseous fuels with ignition and safety systems incorporated, with main flame and with pilot flame to stabilize the latter, comprising a burner body which defines an annular distribution chamber receiving the gas mixture.
  • primary fuel-air, main passages being formed in the burner body to supply the main flame with fuel mixture from said chamber and auxiliary passages also being formed in the burner body for supplying the pilot flame with fuel mixture from from the room; at least one ignition electrode; a security feature; and a protective cap disposed on the burner body.
  • the ignition of the burners can be carried out electrically by sparks emitted by an electrode or spark plug by means of a piezoelectric or electronic system.
  • the safety device can be constituted by an expansion device (metallic, liquid or vapor), a device producing an electromotive force, such as for example a thermocouple, or an electronic device using for example an ionization detection electrode.
  • an expansion device metallic, liquid or vapor
  • a device producing an electromotive force such as for example a thermocouple
  • an electronic device using for example an ionization detection electrode such as for example a thermocouple
  • the electrodes ignition, and the safety elements are arranged outside the burners, near the flame exit orifices, in the axis of the latter and at a determined distance from the orifices.
  • the present invention aims precisely to remedy the aforementioned drawbacks and to provide a burner ensuring effective protection of the ignition and safety devices against the risks of damage or adjustment.
  • a burner of the type defined at the top of the present document characterized in that the burner body defines a central well coaxial with the distribution chamber, located under the cap and opening out at the bottom of the burner to allow the 'secondary air supply; in that radial grooves opening at least locally into the distribution chamber are formed in the upper part of the burner body located under the cap and in that the ignition electrode and the safety element are arranged at the inside the central well under the protective cap.
  • the ignition electrodes and safety elements can be effectively protected against external aggressions.
  • the holes and grooves in the upper part of the burner head allow ignition by electrode and safety by thermocouple from inside the burner while ensuring interignition.
  • the radial grooves are formed in the burner body in the vicinity of the ignition electrode and the safety element.
  • the ignition electrode and the safety element are placed diametrically opposite inside the central well.
  • the ignition electrode and the safety element are mounted on flanges of the burner body which form protrusions inside the central well.
  • the grooves formed in the upper part of the burner body allow communication with the distribution chamber by means of two orifices forming an angle between them.
  • the grooves formed in the upper part of the burner body are flared at the peripheral part of the burner body.
  • the grooves formed in the burner body have a width of between about 1 and 4mm.
  • the cap rests on the burner head by ribs delimiting between them radial passages.
  • the radial passages formed between the ribs are of constant width or are slightly narrowed towards the periphery of the cap.
  • the height of the ribs is at least about 4mm.
  • the particular configuration of the bottom surface of the hat allows both better distribution of the calories absorbed during operation burner and greater ventilation in the flames, which improves combustion.
  • FIGS. 1 and 2 show a burner according to the invention, which has no ignition or safety device located outside the burner body 100.
  • the burner body itself is made up of three main parts.
  • a lower annular part 102 delimits a distribution chamber for the primary fuel-air gas mixture which arrives via a lateral duct 101 opening into the annular distribution chamber 20.
  • the inner annular wall of the distribution chamber 20 delimits a free space 50 which opens out at the lower part of the burner while being isolated from the interior of the distribution chamber 20.
  • the main flames and the pilot flame are supplied with combustible mixture from the distribution chamber 20 by passages 22, 21 respectively arranged in the intermediate part 103 of the burner.
  • the annular passage 21 for supplying the pilot flame can be delimited for example by two separate parts 103, 103 ′ of the intermediate part of the burner while the passages 22 for supplying the main flames can be formed on the upper surface external part of the upper part 103 ′ of the intermediate part 103, 103 ′.
  • the passages 22 are distributed uniformly over the entire periphery of the burner.
  • the upper part 104 of the burner body 100 which cooperates with the intermediate part 103, 103 ′ to define the main passages 22 for supplying the main flames, has the form of a cylindrical sleeve provided with a flange 107 (FIG. 3 ).
  • a protective cap 105 rests on the flange 107 of the upper part 104 of the burner.
  • a vertical central well 50 is formed inside the burner over the entire height thereof and is only closed at its upper part by the cap 105.
  • An electrode 10 and a safety element 15 are arranged inside the central well 50 and are fixed on pairs of flanges 51, 52 and 53, 54 respectively.
  • one 53, 51 is secured to the upper part 104 of the burner body
  • the other 54, 52 is secured to the lower part 102 of the burner body.
  • the security element 15 fastened to the flange 54 by nuts 13,: 14, has its active portion 16 (e.g. a thermocouple located immediately below the cap 105, in the vicinity of the upper portion 104.
  • the electrode 10 presents its active part 11 immediately under the cap 105 in the vicinity of the upper part 104.
  • the security element 15 and the electrode 10 are arranged diametrically opposite inside the cylindrical well 50 and are parallel to the axis of the burner.
  • the electrode 10 and the safety element 15 which pass through the flanges 51, 52 and 53, 54 respectively are connected by conductors 12, 17 respectively to the conventional electric burner control devices, not shown.
  • FIG. 1 we will now consider more particularly Figures 1, 3 and 4 where we can observe the presence of grooves 41, 42 formed in the upper face of the upper part 104 of the burner body 100.
  • the radial grooves 42, 41 are located in look at the active parts 11, 16 of the electrode 10 and of the safety element 15 respectively.
  • the grooves 41, 42 are thus aligned along a diameter of the flange 107.
  • Each groove 41, 42 communicates through an orifice 43, 45 respectively with the annular space 47 for distributing the fuel mixture at the main passages 22 main flame supply.
  • the orifices 43, 45 are intended to allow interignition.
  • Additional orifices 44, 46 whose axes are inclined for example by about 50 to 60 ° relative to the axis of the first orifices 43, 45 respectively, put in communication with the annular space 47 for distribution of the fuel mixture to the main passages 22, vertical groove parts 41b, 42b which extend the horizontal groove parts 41a, 42a of the grooves 41 42.
  • the orifices 43, 45 also contribute to allowing interignition.
  • the grooves 41, 42 may have slightly different configurations from those shown in the figures, but it is essential that each of the grooves communicates at least locally, with the annular space 47 for distributing the fuel mixture at the main passages 22.
  • Each groove 41 , 42 may for example have a greater width at its upper part and be extended by a narrower slot communicating with the annular space 47. It is advantageous that the grooves 41, 42 are slightly flared in the zone where they open out. at the periphery of the burner body.
  • a groove 41, 42 may have a width on the order of 2 to 2.5 mm and a depth on the order of 1.2 to 1. , 5mm, the orifices 43, 44, 45, 46 may have a diameter close to the width of the grooves.
  • the protective cap 105 rests on the upper surface of the flange 107 of the part 104 by planar projections or ribs 151 regularly distributed around the periphery of the lower face. of the cap 105.
  • Radial passages 152 of substantially constant width or slightly increasing towards the outside are reserved between the ribs 151.
  • the passages 152 favor the passage of secondary air and the aeration of the flames while the lower surfaces
  • the ribs 151 in contact with the burner head 104 participate in the diffusion of the calories absorbed during the operation of the burner.
  • the ribs 151 may for example be twelve in number and are regularly distributed over the peripheral part of the underside of the cap 105.
  • the ribs 151 may have a height of the order of 3 to 5mm.
  • Pawns 153 are engaged in corresponding housings 141 (FIG. 4) of the flange 107 of the part 104 to correctly position the cap 105 on the burner body 100.
  • the cap 105 has a diameter equal to or slightly greater than the diameter of the burner body 100 at the pilot flame.
  • the grooves 41, 42 and orifices 43 to 46 formed in the upper part 104 of the burner head have the role of enabling the ignition by electrode and the safety by thermocouple from the inside. of the burner.
  • the diameter of the orifices 43 to 46, their location, and the dimensional characteristics of the grooves 41, 42 are adapted to ensure inter-ignition and safety over a whole determined range of use of the burner between full flow and reduced flow.
  • the parameters of these elements can thus be adapted to different operating conditions.
  • the orifices 46, 44 are essential for maintaining a residual flame in the vicinity of the elements 10 and 15 and ensuring inter-ignition by the annular zone 47 while the orifices 45, 43 do not have only a more secondary role.
  • the burner body as described above is particularly easy to manufacture and can be made, for example, of aluminum. It is particularly suitable for extra-flat cooktops.
  • the assembly of the electrodes and safety elements is also particularly simple.

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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)
  • Control Of Combustion (AREA)

Abstract

Le corps de brûleur (100) définit un puits central (50) coaxial à la chambre de répartition (20), situé sous le chapeau (105) et débouchant à la partie inférieure du brûleur pour permettre l'arrivée d'air secondaire. Des rainures radiales (41, 42) débouchant au moins localement dans la chambre de répartition (20) sont formées dans la partie supérieure (104) du corps de brûleur (100) située sous le chapeau (105). Une électrode d'allumage (10) et un élément de sécurité (15) sont disposés à l'intérieur du puits central (50) sous le chapeau de protection (105). Application notamment aux bruleurs pour tables de cuisson extra-plates.The burner body (100) defines a central well (50) coaxial with the distribution chamber (20), located under the cap (105) and opening at the bottom of the burner to allow the arrival of secondary air. Radial grooves (41, 42) opening at least locally into the distribution chamber (20) are formed in the upper part (104) of the burner body (100) located under the cap (105). An ignition electrode (10) and a safety element (15) are arranged inside the central well (50) under the protective cap (105). Application in particular to burners for extra-flat cooktops.

Description

La présente invention se rapporte d'une manière générale aux brûleurs pour combustibles gazeux, notamment pour appareils de cuisson, équipés de dispositifs d'allumage et de sécurité à l'extinction.The present invention relates generally to burners for gaseous fuels, in particular for cooking appliances, equipped with ignition and extinguishing safety devices.

L'invention concerne plus particulièrement un brûleur pour combustibles gazeux à systèmes d'allumage et de sécurité incorporés, à flamme principale et à flamme pilote pour stabiliser celle-ci, comportant un corps de brûleur qui définit une chambre annulaire de répartition recevant le mélange gaz combustible-air primaire, des passages principaux étant formés dans le corps de brûleur pour alimenter la flamme principale en mélange combustible à partir de ladite chambre et des passages auxiliaires étant également formés dans le corps de brûleur pour alimenter la flamme pilote en mélange combustible à partir de la chambre; au moins une électrode d'allumage; un élément de sécurité; et un chapeau de protection disposé sur le corps de brûleur.The invention relates more particularly to a burner for gaseous fuels with ignition and safety systems incorporated, with main flame and with pilot flame to stabilize the latter, comprising a burner body which defines an annular distribution chamber receiving the gas mixture. primary fuel-air, main passages being formed in the burner body to supply the main flame with fuel mixture from said chamber and auxiliary passages also being formed in the burner body for supplying the pilot flame with fuel mixture from from the room; at least one ignition electrode; a security feature; and a protective cap disposed on the burner body.

L'allumage des brûleurs peut être réalisé électriquement par des étincelles émises par une électrode ou bougie d'allumage grâce à un système piézoélectri- que ou électronique.The ignition of the burners can be carried out electrically by sparks emitted by an electrode or spark plug by means of a piezoelectric or electronic system.

Le dispositif de sécurité peut être constitué par un dispositif à dilatation (métallique, liquide ou vapeur), un dispositif produisant une force électromotrice, comme par exemple un thermocouple, ou un dispositif électronique utilisant par exemple une électrode de détection par ionisation.The safety device can be constituted by an expansion device (metallic, liquid or vapor), a device producing an electromotive force, such as for example a thermocouple, or an electronic device using for example an ionization detection electrode.

Ces divers dispositifs agissent directement, c'est-à-dire sans apport d'énergie extérieure, ou indirectement, c'est-à-dire avec apport d'énergie extérieure, au niveau de l'arrivée de gaz combustible au brûleur.These various devices act directly, that is to say without external energy supply, or indirectly, that is to say with external energy supply, at the level of the supply of combustible gas to the burner.

Dans les dispositifs connus, les électrodes d'allumage, et les éléments de sécurité sont disposés à l'extérieur des brûleurs, à proximité des orifices de sortie des flammes, dans l'axe de ces dernières et à une distance déterminée des orifices.In known devices, the electrodes ignition, and the safety elements are arranged outside the burners, near the flame exit orifices, in the axis of the latter and at a determined distance from the orifices.

Lors des nettoyages d'un brûleur équipé de tels dispositifs, il tend à se produire une modification du positionnement d'origine. Il se produit également fréquemment une détérioration et un encrassement des électrodes et éléments de sécurité par les produits de nettoyage ou par les débordements intempestifs des mets en cours de cuisson. Les dispositifs d'allumage et de sécurité sont ainsi facilement perturbés dans leur fonctionnement ou même mis hors service.When cleaning a burner equipped with such devices, there tends to be a change in the original positioning. There is also a frequent deterioration and fouling of the electrodes and safety elements by cleaning products or by untimely overflowing of dishes during cooking. The ignition and safety devices are thus easily disrupted in their operation or even put out of service.

La présente invention vise précisément à remédier aux inconvénients précités et à réaliser un brûleur assurant une protection efficace des dispositifs d'allumage et de sécurité contre les risques d'endommagement ou de déréglage.The present invention aims precisely to remedy the aforementioned drawbacks and to provide a burner ensuring effective protection of the ignition and safety devices against the risks of damage or adjustment.

Ces buts sont atteints grâce à un brûleur du genre défini en tête des présentes, caractérisé en ce que le corps de brûleur définit un puits central coaxial à la chambre de répartition, situé sous le chapeau et débouchant à la partie inférieure du brûleur pour permettre l'arrivée d'air secondaire; en ce que des rainures radiales débouchant au moins localement dans la chambre de répartition sont formées dans la partie supérieure du corps de brûleur située sous le chapeau et en ce que l'électrode d'allumage et l'élément de sécurité sont disposés à l'intérieur du puits central sous le chapeau de protection.These aims are achieved by a burner of the type defined at the top of the present document, characterized in that the burner body defines a central well coaxial with the distribution chamber, located under the cap and opening out at the bottom of the burner to allow the 'secondary air supply; in that radial grooves opening at least locally into the distribution chamber are formed in the upper part of the burner body located under the cap and in that the ignition electrode and the safety element are arranged at the inside the central well under the protective cap.

Grâce à la présence d'un puits central surmonté d'un chapeau, les électrodes d'allumage et éléments de sécurité peuvent être protégés efficacement contre les agressions extérieures.Thanks to the presence of a central well surmounted by a cap, the ignition electrodes and safety elements can be effectively protected against external aggressions.

Les orifices et rainures pratiqués dans la partie supérieure de la tête de brûleur permettent de réaliser l'allumage par électrode et la sécurité par thermocouple depuis l'intérieur du brûleur tout en garantissant un interallumage.The holes and grooves in the upper part of the burner head allow ignition by electrode and safety by thermocouple from inside the burner while ensuring interignition.

Divers aspects particuliers de l'invention sont énoncés ci-dessous.Various specific aspects of the invention are set out below.

Les rainures radiales sont formées dans le corps de brûleur au voisinage de l'électrode d'allumage et de l'élément de sécurité.The radial grooves are formed in the burner body in the vicinity of the ignition electrode and the safety element.

L'électrode d'allumage et l'élément de sécurité sont placés de façon diamétralement opposée à l'intérieur du puits central.The ignition electrode and the safety element are placed diametrically opposite inside the central well.

L'électrode d'allumage et l'élément de sécurité sont montés sur des brides du corps de brûleur qui forment des saillies à l'intérieur du puits central.The ignition electrode and the safety element are mounted on flanges of the burner body which form protrusions inside the central well.

Les rainures formées dans la partie supérieure du corps de brûleur permettent une communication avec la chambre de répartition à l'aide de deux orifices formant un angle entre eux.The grooves formed in the upper part of the burner body allow communication with the distribution chamber by means of two orifices forming an angle between them.

Les rainures formées dans la partie supérieure du corps de brûleur sont évasées à la partie périphérique du corps de brûleur.The grooves formed in the upper part of the burner body are flared at the peripheral part of the burner body.

Les rainures formées dans le corps de brûleur présentent une largeur comprise entre environ 1 et 4mm.The grooves formed in the burner body have a width of between about 1 and 4mm.

Le chapeau repose sur la tête de brûleur par des nervures délimitant entre elles des passages radiaux.The cap rests on the burner head by ribs delimiting between them radial passages.

Les passages radiaux ménagés entre les nervures sont de largeur constante ou sont légèrement rétrécis vers la périphérie du chapeau.The radial passages formed between the ribs are of constant width or are slightly narrowed towards the periphery of the cap.

La hauteur des nervures est d'au moins environ 4mm.The height of the ribs is at least about 4mm.

La configuration particulière de la surface inférieure du chapeau permet à la fois une meilleure diffusion des calories absorbées pendant le fonctionnement du brûleur et une aération plus importante au niveau des flammes, ce qui améliore la combustion.The particular configuration of the bottom surface of the hat allows both better distribution of the calories absorbed during operation burner and greater ventilation in the flames, which improves combustion.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui fait suite d'un mode particulier de réalisation, donnée en référence au dessin annexé, sur lequel :

  • - la figure 1 est une vue en coupe axiale d'un brûleur selon l'invention,
  • - la figure 2 est une vue en élévation du brûleur de la figure 1,
  • - la figure 3 est une vue en coupe selon la ligne III-III de la pièce du corps de brûleur de la figure 4,
  • - la figure 4 est une vue de dessus d'un corps de brûleur selon l'invention,
  • - la figure 5 est une vue de dessous d'un chapeau de brûleur selon l'invention, et
  • - la figure 6 est une vue en coupe selon la ligne VI-VI de la figure 5.
Other characteristics and advantages of the invention will emerge from the description which follows a particular embodiment, given with reference to the appended drawing, in which:
  • FIG. 1 is an axial section view of a burner according to the invention,
  • FIG. 2 is an elevation view of the burner of FIG. 1,
  • FIG. 3 is a sectional view along line III-III of the part of the burner body of FIG. 4,
  • FIG. 4 is a top view of a burner body according to the invention,
  • FIG. 5 is a bottom view of a burner cap according to the invention, and
  • - Figure 6 is a sectional view along line VI-VI of Figure 5.

On voit sur les figures 1 et 2 un brûleur conforme à l'invention, qui ne présente aucun dispositif d'allumage ou de sécurité situé à l'extéiieur du corps de brûleur 100.FIGS. 1 and 2 show a burner according to the invention, which has no ignition or safety device located outside the burner body 100.

Le corps de brûleur proprement dit est constitué de trois parties principales. Une partie annulaire inférieure 102 délimite une chambre de répartition pour le mélange gaz combustible-air primaire qui arrive par un conduit latéral 101 débouchant dans la chambre annulaire de répartition 20. La paroi annulaire intérieure de la chambre de répartition 20 délimite un espace libre 50 qui débouche à la partie inférieure du brûleur tout en étant isolé de l'intérieur de la chambre de répartition 20. Une partie intermédiaire 103 du corps de brûleur 100 isolée de la partie annulaire inférieure 102 par un joint 106 d'isolation thermique, et qui peut être constituée en plusieurs pièces 103, 103', délimite la paroi supérieure extérieure de la chambre de répartition 20. Les flammes principales et la flamme pilote sont alimentées en mélange combustible à partir de la chambre de répartition 20 par des passages 22, 21 respectivement ménagés dans la partie intermédiaire 103 du brûleur. Le passage annulaire 21 d'ali- mentation de la flamme pilote peut être délimité par exemple par deux pièces distinctes 103, 103' de la partie intermédiaire du brûleur tandis que les passages 22 d'alimentation des flammes principales peuvent être formées à la surface supérieure externe de la pièce supérieure 103' de la partie intermédiaire 103, 103'. Les passages 22 sont répartis uniformément sur toute la périphérie du brûleur. La partie supérieure 104 du corps de brûleur 100 qui coopère avec la partie intermédiaire 103, 103' pour définir les passages principaux 22 d'alimentation des flammes principales, présente la forme d'un manchon cylindrique muni d'une collerette 107 (Fig.3). Un chapeau de protection 105 repose sur la collerette 107 de la partie supérieure 104 du brûleur. Selon l'invention, un puits central vertical 50 est ménagé à l'intérieur du brûleur sur toute la hauteur de celui-ci et ne se trouve obturé à sa partie supérieure que par le chapeau 105. Une électrode 10 et un élément de sécurité 15 sont disposés à l'intérieur du puits central 50 et sont fixés sur des paires de brides 51,52 et 53, 54 respectivement. Pour chaque paire de brides, l'une 53,51 est solidaire de la partie supérieure 104 du corps de brûleur, l'autre 54, 52 est solidaire de la partie inférieure 102 du corps de brûleur. L'élément de sécurité 15 fixé sur la bride 54 par dés écrous 13, :14, a sa partie active 16 (par exemple un thermocouple située immédiatement sous le chapeau 105, au voisinage de la partie supérieure 104. De même, l'électrode 10 présente sa partie active 11 immédiatement sous le chapeau 105 au voisinage de la partie supérieure 104. Dans l'exemple de réalisation représenté sur le dessin, l'élément de sécurité 15 et l'électrode 10 sont disposés de façon diamétralement opposée à l'intérieur du puits cylindrique 50 et sont parallèles à l'axe du brûleur. L'électrode 10 et l'élément de sécurité 15 qui traversent les brides 51,52 et 53, 54 respectivement sont raccordés par des conducteurs 12, 17 respectivement aux dispositifs électriques classiques de commande du brûleur, non représentés.The burner body itself is made up of three main parts. A lower annular part 102 delimits a distribution chamber for the primary fuel-air gas mixture which arrives via a lateral duct 101 opening into the annular distribution chamber 20. The inner annular wall of the distribution chamber 20 delimits a free space 50 which opens out at the lower part of the burner while being isolated from the interior of the distribution chamber 20. An intermediate part 103 of the burner body 100 isolated from the lower annular part 102 by a seal 106 of thermal insulation, and which can be made up of several pieces 103, 103 ′, delimits the outer upper wall of the distribution chamber 20. The main flames and the pilot flame are supplied with combustible mixture from the distribution chamber 20 by passages 22, 21 respectively arranged in the intermediate part 103 of the burner. The annular passage 21 for supplying the pilot flame can be delimited for example by two separate parts 103, 103 ′ of the intermediate part of the burner while the passages 22 for supplying the main flames can be formed on the upper surface external part of the upper part 103 ′ of the intermediate part 103, 103 ′. The passages 22 are distributed uniformly over the entire periphery of the burner. The upper part 104 of the burner body 100 which cooperates with the intermediate part 103, 103 ′ to define the main passages 22 for supplying the main flames, has the form of a cylindrical sleeve provided with a flange 107 (FIG. 3 ). A protective cap 105 rests on the flange 107 of the upper part 104 of the burner. According to the invention, a vertical central well 50 is formed inside the burner over the entire height thereof and is only closed at its upper part by the cap 105. An electrode 10 and a safety element 15 are arranged inside the central well 50 and are fixed on pairs of flanges 51, 52 and 53, 54 respectively. For each pair of flanges, one 53, 51 is secured to the upper part 104 of the burner body, the other 54, 52 is secured to the lower part 102 of the burner body. The security element 15 fastened to the flange 54 by nuts 13,: 14, has its active portion 16 (e.g. a thermocouple located immediately below the cap 105, in the vicinity of the upper portion 104. Similarly, the electrode 10 presents its active part 11 immediately under the cap 105 in the vicinity of the upper part 104. In the embodiment shown in the drawing, the security element 15 and the electrode 10 are arranged diametrically opposite inside the cylindrical well 50 and are parallel to the axis of the burner. The electrode 10 and the safety element 15 which pass through the flanges 51, 52 and 53, 54 respectively are connected by conductors 12, 17 respectively to the conventional electric burner control devices, not shown.

on considérera maintenant plus particulièrement les figures 1, 3 et 4 où l'on peut observer la présence de rainures 41, 42 ménagées dans la face supérieure de la partie supérieure 104 du corps de brûleur 100. Les rainures radiales 42, 41 sont situées en regard des parties actives 11, 16 de l'électrode 10 et de l'élément de sécurité 15 respectivement. Dans l'exemple représenté, les rainures 41, 42 sont ainsi alignées selon un diamètre de la collerette 107. Chaque rainure 41, 42 communique par un orifice 43, 45 respectivement avec l'espace annulaire 47 de distribution du mélange combustible aux passages principaux 22 d'alimentation des flammes principales. Les orifices 43, 45 ont pour but de permettre un interallumage. Des orifices supplémentaires 44, 46, dont les axes sont inclinés par exemple d'environ 50 à 60° par rapport à l'axe des premiers orifices 43, 45 respectivement, mettent en communication avec l'espace annulaire 47 de distribution du mélange combustible aux passages principaux 22,des parties de rainure verticales 41b, 42b qui prolongent les parties de rainure horizontales 41a, 42a des rainures 41 42. Les orifices 43, 45 contribuent également à permettre un interallumage.we will now consider more particularly Figures 1, 3 and 4 where we can observe the presence of grooves 41, 42 formed in the upper face of the upper part 104 of the burner body 100. The radial grooves 42, 41 are located in look at the active parts 11, 16 of the electrode 10 and of the safety element 15 respectively. In the example shown, the grooves 41, 42 are thus aligned along a diameter of the flange 107. Each groove 41, 42 communicates through an orifice 43, 45 respectively with the annular space 47 for distributing the fuel mixture at the main passages 22 main flame supply. The orifices 43, 45 are intended to allow interignition. Additional orifices 44, 46, whose axes are inclined for example by about 50 to 60 ° relative to the axis of the first orifices 43, 45 respectively, put in communication with the annular space 47 for distribution of the fuel mixture to the main passages 22, vertical groove parts 41b, 42b which extend the horizontal groove parts 41a, 42a of the grooves 41 42. The orifices 43, 45 also contribute to allowing interignition.

Les rainures 41, 42 peuvent présenter des configurations légèrement différentes de celles représentées sur les figures, mais il est essentiel que chacune des rainures communique au moins localement, avec l'espace annulaire 47 de distribution du mélange combustible aux passages principaux 22. Chaque rainure 41,42 peut par exemple, présenter une largeur plus importante à sa partie supérieure et se prolonger par une fente plus étroite de communication avec l'espace annulaire 47. Il est avantageux que les rainures 41,42 soient légèrement évasées dans la zone où elles débouchent à la périphérie du corps de brûleur.The grooves 41, 42 may have slightly different configurations from those shown in the figures, but it is essential that each of the grooves communicates at least locally, with the annular space 47 for distributing the fuel mixture at the main passages 22. Each groove 41 , 42 may for example have a greater width at its upper part and be extended by a narrower slot communicating with the annular space 47. It is advantageous that the grooves 41, 42 are slightly flared in the zone where they open out. at the periphery of the burner body.

A titre d'exemple, une rainure 41,42 conforme au mode de réalisation des figures 1, 3 et 4 peut présenter une largeur de l'ordre de 2 à 2,5mm et une profondeur de l'ordre de 1,2 à 1,5mm, les orifices 43, 44,45,46 pouvant avoir un diamètre voisin de la largeur des rainures.By way of example, a groove 41, 42 according to the embodiment of FIGS. 1, 3 and 4 may have a width on the order of 2 to 2.5 mm and a depth on the order of 1.2 to 1. , 5mm, the orifices 43, 44, 45, 46 may have a diameter close to the width of the grooves.

Avec une rainure prolongée sur toute sa longueur par une fente, il est possible de réaliser par exemple sur une profondeur d'environ 1,2 à 2mm. une entaille de 3mm de largeur à partir de la surface supérieure de la collerette 107 puis de réaliser dans le reste de l'épaisseur de la collerette 107 une fente d'environ 1mm de largeur.With a groove extended over its entire length by a slot, it is possible to produce for example over a depth of about 1.2 to 2mm. a notch 3mm wide from the upper surface of the flange 107 and then make a slit about 1mm wide in the rest of the thickness of the flange 107.

Si l'on considère les figures 1, 5 et 6, son voit que le chapeau de protection 105 repose sur la surface supérieure de la collerette 107 de la partie 104 par des saillies ou nervures planes 151 régulièrement réparties à la périphérie de la face inférieure du chapeau 105. Des passages radiaux 152 de largeur sensiblement constante ou en légère augmentation vers ,l'extérieur sont réservés entre les nervures 151. Les passages 152 favorisent le passage de l'air secondaire et l'aération des flammes tandis que les surfaces inférieures des nervures 151 en contact avec la tête du brûleur 104 participent à la diffusion des calories absorbées pendant le fonctionnement du brûleur. Les nervures 151 peuvent être par exemple au nombre de douze et sont régulièrement réparties sur la partie périphérique de la face inférieure du chapeau 105. Les nervures 151 peuvent présenter une hauteur de l'ordre de 3 à 5mm. Des pions 153,, par exemple trois pions régulièrement décalés de 120°, solidaires de la face inférieure du chapeau 105, sont engagés dans des logements correspondants 141 (figure 4) de la collerette 107 de la partie 104 pour positionner correctement le chapeau 105 sur le corps de brûleur 100.If we consider Figures 1, 5 and 6, it can be seen that the protective cap 105 rests on the upper surface of the flange 107 of the part 104 by planar projections or ribs 151 regularly distributed around the periphery of the lower face. of the cap 105. Radial passages 152 of substantially constant width or slightly increasing towards the outside are reserved between the ribs 151. The passages 152 favor the passage of secondary air and the aeration of the flames while the lower surfaces The ribs 151 in contact with the burner head 104 participate in the diffusion of the calories absorbed during the operation of the burner. The ribs 151 may for example be twelve in number and are regularly distributed over the peripheral part of the underside of the cap 105. The ribs 151 may have a height of the order of 3 to 5mm. Pawns 153 ,, for example three pawns regularly offset by 120 °, integral with the underside of the cap 105, are engaged in corresponding housings 141 (FIG. 4) of the flange 107 of the part 104 to correctly position the cap 105 on the burner body 100.

Comme on peut le voir sur les figures 1 et 2, le chapeau 105 a un diamètre égal ou légèrement supérieur au diamètre du corps de brûleur 100 au niveau de la flamme pilote.As can be seen in Figures 1 and 2, the cap 105 has a diameter equal to or slightly greater than the diameter of the burner body 100 at the pilot flame.

D'une manière générale, les rainures 41,42 et orifices 43 à 46 pratiqués dans la partie supérieure 104 de la tête de brûleur ont pour rôle de permettre la réalisation de l'allumage par électrode et de la sécurité par thermocouple depuis l'intérieur du brûleur. Le diamètre des orifices 43 à 46, leur emplacement, et les caractéristiques dimensionnelles des rainures 41,42 sont adaptés pour assurer l'interallumage et la sécurité sur toute une plage déterminée d'utilisation du brûleur entre plein débit et débit réduit. Les paramètres de ces éléments peuvent ainsi être adaptés à différentes conditions de fonctionnement. On notera cependant que dans le mode particulier de réalisation décrit, les orifices 46, 44 sont essentiels pour entretenir une flamme résiduelle au voisinage des éléments 10 et 15 et assurer l'interallumage par la zone annulaire 47 tandis que les orifices 45, 43 n'ont qu'un rôle plus secondaire.In general, the grooves 41, 42 and orifices 43 to 46 formed in the upper part 104 of the burner head have the role of enabling the ignition by electrode and the safety by thermocouple from the inside. of the burner. The diameter of the orifices 43 to 46, their location, and the dimensional characteristics of the grooves 41, 42 are adapted to ensure inter-ignition and safety over a whole determined range of use of the burner between full flow and reduced flow. The parameters of these elements can thus be adapted to different operating conditions. Note however that in the particular embodiment described, the orifices 46, 44 are essential for maintaining a residual flame in the vicinity of the elements 10 and 15 and ensuring inter-ignition by the annular zone 47 while the orifices 45, 43 do not have only a more secondary role.

Le corps de brûleur tel que décrit précédemment est particulièrement aisé à fabriquer et peut être réalisé par exemple en aluminium. Il s'adapte particulièrement bien à des tables de cuisson extra-plates. Leomontage des électrodes et éléments de sécurité est également particulièrement simple.The burner body as described above is particularly easy to manufacture and can be made, for example, of aluminum. It is particularly suitable for extra-flat cooktops. The assembly of the electrodes and safety elements is also particularly simple.

Claims (11)

1. Brûleur pour combustibles gazeux à systèmes d'allumage et de sécurité incorporés, à flamme principale et à flamme pilote disposée au voisinage de la flamme principale pour stabiliser celle-ci, comportant un corps de brûleur (100) qui définit une chambre annulaire (20) de répartition recevant le mélange gaz combustible-air primaire, des passages principaux (22) étant formés dans le corps de brûleur pour alimenter la flamme principale en mélange combustible à partir de ladite chambre (20) et des passages auxiliaires (21) étant également formés dans le corps du brûleur pour alimenter la flamme pilote en mélange combustible à partir de la chambre (20); au moins une électrode d'allumage (10); un élément de sécurité (15); et un chapeau de protection (105) disposé sur le corps de brûleur (100) caractérisé en ce que le corps de brûleur (100) définit un puits central (50) coaxial à la chambre de répartition (20), situé sous le chapeau (105) et débouchant à la partie inférieure du brûleur pour permettre l'arrivée d'air secondaire; en ce que des rainures radiales (41,42) débouchant au moins localement dans la chambre de répartition (20) sont formées dans la partie supérieure (104) du corps de brûleur (100) située sous le chapeau (105) et en ce que l'électrode d'allumage (10) et l'élément de sécurité (15) sont disposés à l'intérieur du puits central (50) sous le chapeau de protection (105).1. Burner for gaseous fuels with ignition and safety systems incorporated, with main flame and pilot flame arranged in the vicinity of the main flame to stabilize the latter, comprising a burner body (100) which defines an annular chamber ( 20) of distribution receiving the primary fuel-air gas mixture, main passages (22) being formed in the burner body to supply the main flame with combustible mixture from said chamber (20) and auxiliary passages (21) being also formed in the burner body for supplying the pilot flame with combustible mixture from the chamber (20); at least one ignition electrode (10); a security element (15); and a protective cap (105) disposed on the burner body (100) characterized in that the burner body (100) defines a central well (50) coaxial with the distribution chamber (20), located under the cap ( 105) and opening at the lower part of the burner to allow the arrival of secondary air; in that radial grooves (41,42) opening at least locally into the distribution chamber (20) are formed in the upper part (104) of the burner body (100) located under the cap (105) and in that the ignition electrode (10) and the safety element (15) are arranged inside the central well (50) under the protective cap (105). 2. Brûleur selon la revendication 1, caractérisé en ce que les rainures radiales (41,42) sont formées dans le corps de brûleur (100) au voisinage de l'électrode d'allumage (10) et de l'élément de sécurité (15).2. Burner according to claim 1, characterized in that the radial grooves (41,42) are formed in the burner body (100) in the vicinity of the ignition electrode (10) and the safety element ( 15). 3. Brûleur selon la revendication 1 ou la revendication 2, caractérisé en ce que l'électrode d'allumage (10) et l'élément de sécurité (15) sont placés de façon diamétralement opposée à l'intérieur du puits central (50).3. Burner according to claim 1 or claim 2, characterized in that the ignition electrode (10) and the safety element (15) are placed diametrically opposite inside the central well (50). 4. Brûleur selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'électrode d'allumage (10) et l'élément de sécurité (15) sont montés sur des brides (51 à 54) du corps du brûleur (100) qui forment des saillies à l'intérieur du puits central (50).4. Burner according to any one of claims 1 to 3, characterized in that the ignition electrode (10) and the safety element (15) are mounted on flanges (51 to 54) of the burner body (100) which form protrusions inside the central well (50). 5. Brûleur selon l'une quelconque des reven- idcations 1 à 4, caractérisé en ce que les rainures (41, 42) formées dans la partie supérieure (104) du corps de brûleur (100) permettent une communication avec la chambre de répartition (20) à l'aide de deux orifices (43, 44; 45,46) formant un angle entre eux.5. Burner according to any one of claims 1 to 4, characterized in that the grooves (41, 42) formed in the upper part (104) of the burner body (100) allow communication with the distribution chamber (20) using two orifices (43, 44; 45.46) forming an angle between them. 6.Brûleur selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les rainures (41, 42) formées dans la partie supérieure (104) du corps de brûleur sont évaséesà la partie périphérique du corps de brûleur.6. Burner according to any one of claims 1 to 5, characterized in that the grooves (41, 42) formed in the upper part (104) of the burner body are flared to the peripheral part of the burner body. 7. Brûleur selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les rainures (41, 42) formées dans le corps de brûleur présentent une largeur comprise entre environ 1 et 4mm.7. Burner according to any one of claims 1 to 6, characterized in that the grooves (41, 42) formed in the burner body have a width of between approximately 1 and 4mm. 8. Brûleur selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le chapeau repose sur la tête de brûleur (104) par des nervures (151) délimitant entre elles des passages radiaux (152).8. Burner according to any one of claims 1 to 7, characterized in that the cap rests on the burner head (104) by ribs (151) delimiting between them radial passages (152). 9. Brûleur selon la revendication 8, caractérisé en ce que les passages radiaux (152) ménagés entre les nervures (151) sont de largeur constante ou sont légèrement rétrécis vers la périphériq du chapeau.9. Burner according to claim 8, characterized in that the radial passages (152) formed between the ribs (151) are of constant width or are slightly narrowed towards the periphery of the cap. 10. Brûleur selon la revendication 8 ou la revendication 9, caractérisé en ce que la hauteur des nervures (151) est d'au moins environ 4mm.10. Burner according to claim 8 or claim 9, characterized in that the height of the ribs (151) is at least about 4mm. 11. Brûleur selon l'une quelconque des revendications 8 à 10, caractérisé en ce que le chapeau (105) est positionné sur le corps de brûleur à l'aide de trois pions (153).11. Burner according to any one of claims 8 to 10, characterized in that the cap (105) is positioned on the burner body using three pins (153).
EP84400831A 1983-04-29 1984-04-25 Burner for gaseous fuel incorporating ignition and safety systems Expired EP0125965B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400831T ATE35451T1 (en) 1983-04-29 1984-04-25 GASEOUS FUEL BURNER WITH BUILT-IN IGNITION AND SAFETY SYSTEM.

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FR8307170A FR2545196B1 (en) 1983-04-29 1983-04-29 BURNER FOR GAS FUELS WITH INCORPORATED IGNITION AND SAFETY SYSTEMS
FR8307170 1983-04-29

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EP0125965A1 true EP0125965A1 (en) 1984-11-21
EP0125965B1 EP0125965B1 (en) 1988-06-29

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EP (1) EP0125965B1 (en)
JP (1) JPS6086316A (en)
AT (1) ATE35451T1 (en)
CA (1) CA1223516A (en)
DE (1) DE3472444D1 (en)
ES (1) ES287342Y (en)
FR (1) FR2545196B1 (en)

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FR2594213A1 (en) * 1986-02-13 1987-08-14 Madec Mater France Improved burner for gaseous fuels with incorporated ignition and safety systems
FR2618881A2 (en) * 1986-02-13 1989-02-03 Madec Mater France Improved burner for gaseous fuels with built-in ignition and safety systems
GB2209593A (en) * 1987-09-08 1989-05-17 Sourdillon Airindex Sa Gas burner
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GB2272283A (en) * 1992-10-22 1994-05-11 Fagor S Coop Ltda Super-slim gas safety burner
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EP0634608A2 (en) * 1993-07-16 1995-01-18 Officine Meccaniche Defendi S.R.L: Double ring gas burner
EP0634608A3 (en) * 1993-07-16 1995-06-21 Defendi Off Mec Srl Double ring gas burner.
AU685865B2 (en) * 1993-12-09 1998-01-29 Ausmark International Pty Ltd Wok burner with dispersement plate
EP1067334A1 (en) 1999-07-09 2001-01-10 BSH Bosch und Siemens Hausgeräte GmbH Gas burner for devices to cook food products
CN111271740A (en) * 2020-03-09 2020-06-12 嵊州市圣华智控科技有限公司 High stability gas ignition

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EP0125965B1 (en) 1988-06-29
DE3472444D1 (en) 1988-08-04
JPS6086316A (en) 1985-05-15
ES287342U (en) 1986-05-01
US4518346A (en) 1985-05-21
ES287342Y (en) 1987-01-16
FR2545196A1 (en) 1984-11-02
FR2545196B1 (en) 1985-08-16
ATE35451T1 (en) 1988-07-15
CA1223516A (en) 1987-06-30
JPH0137644B2 (en) 1989-08-08

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