EP0932797B1 - Gas burner, in particular for cooking apparatus - Google Patents

Gas burner, in particular for cooking apparatus Download PDF

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Publication number
EP0932797B1
EP0932797B1 EP96932620A EP96932620A EP0932797B1 EP 0932797 B1 EP0932797 B1 EP 0932797B1 EP 96932620 A EP96932620 A EP 96932620A EP 96932620 A EP96932620 A EP 96932620A EP 0932797 B1 EP0932797 B1 EP 0932797B1
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EP
European Patent Office
Prior art keywords
burner
path
vessel
opening
primary air
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
EP96932620A
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German (de)
French (fr)
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EP0932797A1 (en
Inventor
Bernard Dane
André Moreau
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.)
Burner Systems International BSI SA
Original Assignee
Sourdillon SA
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Publication date
Application filed by Sourdillon SA filed Critical Sourdillon SA
Publication of EP0932797A1 publication Critical patent/EP0932797A1/en
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Publication of EP0932797B1 publication Critical patent/EP0932797B1/en
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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
    • F23D14/46—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
    • 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
    • F24C3/08—Arrangement or mounting of burners
    • F24C3/085—Arrangement or mounting of burners on ranges
    • 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
    • F24C3/10—Arrangement or mounting of ignition devices
    • F24C3/103—Arrangement or mounting of ignition devices of electric ignition devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2207/00—Ignition devices associated with burner

Definitions

  • the present invention relates to a gas burner for a cooking appliance such as a stove or a cooking.
  • the present invention also relates to a method for mounting and using a gas burner for culinary appliance.
  • Each of these two types includes a gas injector opening into a mixing chamber in which the gas is first mixed with air, called “air primary ". This mixture then passes through a venturi which leads to flame ports. At the exit of these the mixture undergoes combustion thanks to the addition of a second amount of air, called “secondary air”.
  • the two types of burners mentioned above are distinguished by the method of conveying primary air into the mixing chamber.
  • a first type known from the journal ENERGIETECHNIK, 8 th year, n ° 5, May 1958, page 230 the primary air is taken above the hob, through an annular gap between the hob and the free edge of a peripheral skirt of the burner superstructure.
  • the tank is generally closed. Closing the tank has advantages, particularly with regard to certain flame stability standards in the event of a "gust of wind" in the region below the hob.
  • These burners provide unsatisfactory primary ventilation, because the path of primary air from the annular gap and bypassing the base of the venturi path, presents high pressure drops.
  • these burners are subject to the risk of flame extinction when a flooding of the hob closes the annular gap and / or reaches the mixing chamber from the top of the hob, by the same path that primary air.
  • the second type of burners known from FR-A-1 197 178 (SAUTER), have an open mixing chamber laterally, allowing primary air to be taken from the region on the appliance located below the hob. These burners have poor wind resistance likely to occur below the cooktop, for example example in case of abrupt closing or opening of a door access to the volume located under the hob.
  • FR-A- 2 507 743 describes a burner combining a radial primary air supply above the hob with the injector mounted in a vertical sleeve forming an opening around the injector ring for the main intake of primary air from under the Cooktop. This burner remains sensitive to gusts of wind under the hob.
  • the object of the invention is thus to propose a gas burner with great flexibility of use from the point of view of its assembly, and / or the quality of its combustion even for different kinds of gas, and / or its safety.
  • the invention provides a gas burner according to the preamble of claim 1, which burner, being arranged in accordance with the invention, is characterized by the provisions set out in the part Characterizing of claim 1.
  • the burner according to the invention ensures a very high aeration primary, therefore excellent combustion quality especially with regard to the standards on the maximum rate of carbon monoxide.
  • the burner is surprisingly effective against the risk of flame extinction.
  • the presence of the two routes instead of adding the risks presented by each of them, has at on the contrary, by virtue of eliminating them. So if the ride main is closed, the additional path ensures still some primary ventilation.
  • the path through the tank is only a complementary path, ensuring an air flow for example about five times lower than the main path, its passage section is weak and does not allow gales to reach the mixing chamber.
  • the secondary route constitutes a discharge port for 'substances likely to accidentally enter the room mixing by the primary path. This security is particularly insured when, in accordance with a specific feature optional of the invention, the complementary route opens at a low point in the mixing chamber.
  • the additional route is arranged to provide, if the main route is blocked, a primary ventilation just sufficient to meet standards for maximum levels of carbon monoxide in the combustion gases produced by the flame of the burner. So the section of the complementary path is as small as possible so that all of the above benefits are obtained optimally. So the path additional must be fitted to provide primary ventilation corresponding to approximately 10% of the stoichiometric value required for petroleum gas which is the most difficult fuel. These 10% add to the 50% that the main air path primary is able to provide. The burner therefore totals which is the most difficult fuel. This 10% is added to 50% that the primary path of primary air is capable of providing. The burner therefore totals primary ventilation corresponding to 60% of stoichiometric aeration. This is remarkable and then allows, through secondary aeration, combustion producing rates of very low carbon monoxide, well below standards currently in force.
  • the primary air path extending between the inlet means primary air and the tank can be produced with a very low pressure drop decreased compared to the currently known achievements.
  • the axial part of the venturi, leading to the neck and diverging radially oriented can be considerably shortened without degrading the operation of the venturi.
  • These baffles were intended according to the state of the technique to improve difficult combustion by restricting air primer to lick hot walls before mixing with gas.
  • the burner to gas comprises a tank 1 of generally frustoconical shape.
  • the open top edge of tank has flange device 2 intended to be fixed against the face bottom of a hob 3, using screws 4.
  • the hob 3 has an axial opening 5 through relation to which the open end of the tank is centered 1.
  • the bottom of the tank 1 carries a gas injector fuel 6 mounted to release combustible gas 7 in a jet extending upwards along the vertical axis 8 of the tank 1 and the opening 5.
  • the interior of the tank 1 constitutes a mixing chamber 9 in which the gas 7 is intended to mix with combustion air called air "primary", taken from the atmosphere.
  • a main path of primary air it is arranged between the upper side of the hob 3 and the side bottom of a wall 12 which belongs to a body upper 17 of the burner.
  • the wall 12 is finished, radially outwards, by a skirt 13 oriented obliquely downwards, so towards the upper face of the hob 3.
  • the free edge 14 of the skirt 13 and the upper surface of the hob 3 define between them an annular inlet interval for primary air main around the entire burner.
  • the body upper 17 belongs to a superstructure 16 of the burner. This further comprises a cover 18 covering the upper body 17.
  • the upper body 17 includes a hole central defined by a collar 19 projecting towards the mixture 9 along axis 8 and intended to conduct the mixture of gas and primary air in a defined radial venturi an upper face of the upper body 17 and a face substantially flat bottom of the cover 18.
  • the venturi radial includes, from the upper end to collar 19, opposite the injector 6, a collar 21 of the venturi and a divergent 22 extending radially outwardly start at collar 21.
  • the divergent forms for the mixture a passage section which grows very quickly, thanks to cumulative increase in diameter, and distance between the upper face 23 of the upper body 17 and the underside of the cover 18.
  • the divergent 22 opens out in an annular pressure relief chamber 24 which is separated from the main path 11 by the wall 12. Radially outside, the recovery chamber of pressure 24 is limited by a side wall 26 whose upper edge is crenellated and supports the cover 18.
  • the slots form flame openings 27, limited above by the cover 18.
  • the plane 28 containing the free edge 14 of the skirt 13 extends between the injector 6 and the free bora 29 of the collar 19. It the same goes for the plane of the upper face of the table cooking 3 in the substantially flat region which defines the main path 11.
  • the collar 19 does not not protruding downward from a radial plane (substantially the plane 28) containing the main path 11. The latter can therefore be substantially straight up to what he must change direction to enter the collar 19. This is obtained without increasing the total height of the burner, by simply reducing the length of the collar 19, compared to conventional embodiments.
  • the mixing chamber 9 is in additionally supplied by an additional primary air path 31 comprising a complementary opening 32 formed at through the wall of the tank.
  • the complementary opening 32 extends through a boss 33 on the outer face of the tank 1, and opens into the mixing chamber 9 in one low point of the tank, near the injector 6. Parallel to its axis, the opening 32 has a certain length, giving the air flow passing through it some directivity, and making this air flow relatively insensitive to unwanted flows which can exist near the outer walls of the tank 1. Thanks to the advantageous arrangement which has just been described for the complementary opening 32, the complementary path 31 is almost straight and parallel to the gas flow 7 entering the collar 19. Thus, one or more small section openings 32 provide flow substantial with reduced pressure drop.
  • the gas jet 7 drives with him to the pressure relief chamber 24 and to flame openings 27 the primary air arriving through the main path 11 and the complementary path 31.
  • the journey main 11 provides ventilation corresponding to approximately 50% of the stoichiometric value and that the journey additional 31 provides ventilation corresponding to 10% stoichiometric value for petroleum gas liquefied.
  • a secondary ventilation takes place, with air taken from the atmosphere surrounding the outside of the wall lateral 26.
  • Figure 2 illustrates that one can if one wishes to have more than one complementary opening 32, which can then be of smaller section.
  • the daily maintenance of the burner according to the invention is particularly simple.
  • the superstructure is positioned on the tank 1 by centering feet 34 leaving pass between them the main path 11.
  • the base of the feet 34 rests on the edge of the tank 1.
  • the hob 3 forms, around the opening 5, a dome 37 of more diameter weak than the free edge 14 of the skirt 13, so as to make appear, radially outside the dome, the interval entry ring of the main air path 11 primary.
  • FIGs 3 to 6 illustrate one aspect of the invention relating to the mounting of a spark plug 41.
  • the end active 42 of the candle 41 is positioned in a socket generally semicircular 43 defined by the face outer side wall 26 of the superstructure.
  • Mon flame ports 27 is located at the bottom (radially interior) of this cell 43, as shown in Figures 3, 4 and 5.
  • the top of the cell is closed by the cover 18.
  • This cell which opens radially towards outside, protects the candle and in particular its end active 42 with respect to food depots, but has disadvantage of making it more difficult to supply air secondary for ignition.
  • replacing the candle is complex and Depending on the state of the art, often requires a major disassembly of the burner, making the operation difficult for the user of the culinary appliance.
  • the candle is removable from above the hob.
  • the body of the candle extends through one ear 44 of the peripheral flange 2 of the tank 1.
  • the spark plug 41 has a lateral fixing plate 46 which is placed on the upper face of the ear 44 and can be screwed to the ear 44 by means of a screw 47.
  • the plate 46 extends towards the axis 8 of the burner.
  • the body 45 of the candle 41 carries a connection lug 49 connected to a wire high-voltage power supply 48.
  • the assembly comprising the candle 41 and the end adjacent to the wire 48 can be waxed above the table firing 3, this after removal of the superstructure 16, as shown in Figure 4.
  • the periphery of the opening 5 of the hob 3 forms a notch 52 into which the face fits upper ear 44.
  • body 45 of the spark plug extends upward through path 11 of air primary and through an opening 53 made in the wall 12.
  • the active end 42 of the spark plug thus protrudes in cell 43 forming a flame zone for the flame ignition.
  • the opening 53 is large enough to leave a substantial play around the body of the candle 45 forming a path 54 for secondary air which is taken in path 11 and ends up in cell 43 at outlet of the flame orifice 27 associated with this cell. The ignition of the burner is thus favored by an additional secondary air.
  • Figures 7 to 9 relate to another aspect of the invention relating to the mounting of a flame detector intended to control the cut off of the gas supply when the overheating resulting from the presence of the flame disappears.
  • FR-A-2 660 309 describes how such a detector can be achieved by means of a thermocouple.
  • the welding 61 sensitive to temperature, forming the free end thermocouple 64 is placed substantially at mid-distance between the axes of two flame orifices 27 arranged at the bottom of a cell 62 formed by the face exterior of the side wall 26 of the superstructure.
  • the FR-A-2 660 309 also describes other provisions possible, also consistent with this aspect of the invention, in particular with a single flame orifice influencing the solder 61 of the thermocouple.
  • the thermocouple includes roughly in the middle of its height of a connection lug 63.
  • the thermocouple 64 is fixed to the particularly simple burner by pinching the proximal part 66 of lug 63 between the underside of the hob 3 and an ear 67 of the flange 2 of the tank 1.
  • the ear 67 has on its upper face a recess 68 to accommodate the thickness of the part proximal 66, and a hole 69 for the passage of the part thermocouple down.
  • the hob 3 has a hole 71 to allow the upper part of the thermccouple to extend upward through the primary air path 11. This cools the weld thermocouple (not visible in the figures).
  • thermocouple then extends through an opening 72 formed in the wall 12 separating the path 11 on the one hand and the volume of the cell 62 on the other hand.
  • the opening 72 is sized to present considerable play around thermocouple 64 so that an air flow secondary, taken from the primary air path 11, passes by this play in the cell 62 and promotes the maintenance of flames 73 licking the hot solder 61 of the thermocouple.
  • FIG. 10 relates to an improvement relating to the connection of injector 6 (not shown in this figure) with a gas pipe 81.
  • the tank 1 is produced in such a way as to include, when molded, a fitting 83 for fixing the gas pipe 81 to tank 1 in a position or this pipe communicates with the injector 6 via a conduit 82 also coming from molding (see also figure 1).
  • Fitting 83 forms a widening at the open end of the conduit 82. This enlargement is defined by a lower surface cylindrical threaded 84 terminated inside by a convex conical shoulder 86.
  • the thread 84 is intended for receive an externally threaded clamping sleeve 87 and having at its end facing the shoulder convex conical 86 a corresponding concave conical face 88.
  • Pipe 81 has a flare at its end or conical flange 89 intended to be clamped between the faces 86 and 88 above.
  • the collar 89 comprises, at from the tubular part of the pipe 81, a part 91 extending conically outwards, followed by a terminal flange 92 folded against the inner face of part 91.
  • the terminal flange 89 has a axial elasticity due to the more or less complete folding of the flange 92 against part 91.
  • the conical flange 89 forms a spring between the faces 86 and 88. This prevents any loosening of the socket 87, whatever the temperature variations, and differences in expansion which may result between the material of the tank 1, of the socket 87 and the pipe 81.
  • FIG 11 shows the processes according to the invention.
  • a burner can be strictly identical to the one or those described so far, and by therefore capable of being mounted as has been said up present relative to hob 3, can also be mounted on a cooktop 103 which is shaped so that the free edge 14 of the skirt 13 comes into substantially sealed contact with the face top of the cooktop 103.
  • the dome 37 has a flat top whose diameter is enlarged, to be now greater than that of the free edge 14 of skirt 13.
  • a fully flat work table would be also conceivable.
  • the burner described is capable, by simple difference in the shape of the hob, operate as a burner taking at least part substantial of its primary air above the table cooking or on the contrary in a burner not taking air primary than under the hob.

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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)

Description

La présente invention concerne un brûleur à gaz pour appareil culinaire telle qu'une cuisinière ou un plan de cuisson.The present invention relates to a gas burner for a cooking appliance such as a stove or a cooking.

La présente invention concerne également un procédé pour le montage et l'utilisation d'un brûleur à gaz pour appareil culinaire.The present invention also relates to a method for mounting and using a gas burner for culinary appliance.

Les brûleurs à gaz actuellement commercialisés sont de deux types différents, concurrents, qui ont chacun leurs avantages et leurs inconvénients.The gas burners currently on the market are of two different types, competitors, each with their own advantages and disadvantages.

Chacun de ces deux types comprend un injecteur de gaz débouchant dans une chambre de mélange dans laquelle le gaz est une première fois mélangé à de l'air, appelé "air primaire". Ce mélange passe ensuite par un venturi qui le conduit à des orifices de flamme. A la sortie de ceux-ci le mélange subit une combustion grâce à l'addition d'une seconde quantité d'air, appelée "air secondaire".Each of these two types includes a gas injector opening into a mixing chamber in which the gas is first mixed with air, called "air primary ". This mixture then passes through a venturi which leads to flame ports. At the exit of these the mixture undergoes combustion thanks to the addition of a second amount of air, called "secondary air".

Les deux types de brûleurs précités se distinguent par le mode d'acheminement de l'air primaire dans la chambre de mélange. Selon un premier type, connu d'après la revue ENERGIETECHNIK, 8ième année, n°5, Mai 1958, page 230 l'air primaire est prélevé au-dessus de la table de cuisson, à travers un intervalle annulaire ménagé entre la table de cuisson et le bord libre d'une jupe périphérique de la superstructure du brûleur. Dans ce cas, la cuve est en général fermée. La fermeture de la cuve a des avantages, notamment au regard de certaines normes de stabilité de flammes en cas de "coup de vent" dans la région située en-dessous de la table de cuisson. Ces brûleurs assurent une aération primaire peu satisfaisante, car le trajet de l'air primaire depuis l'intervalle annulaire et contournant la base du trajet venturi, présente de fortes pertes de charge. En outre, ces brûleurs sont sujets à des risques d'extinction de flammes lorsqu'une inondation de la table de cuisson ferme l'intervalle annulaire et/ou atteint la chambre de mélange à partir du dessus de la table de cuisson, par le même trajet que l'air primaire.The two types of burners mentioned above are distinguished by the method of conveying primary air into the mixing chamber. According to a first type, known from the journal ENERGIETECHNIK, 8 th year, n ° 5, May 1958, page 230 the primary air is taken above the hob, through an annular gap between the hob and the free edge of a peripheral skirt of the burner superstructure. In this case, the tank is generally closed. Closing the tank has advantages, particularly with regard to certain flame stability standards in the event of a "gust of wind" in the region below the hob. These burners provide unsatisfactory primary ventilation, because the path of primary air from the annular gap and bypassing the base of the venturi path, presents high pressure drops. In addition, these burners are subject to the risk of flame extinction when a flooding of the hob closes the annular gap and / or reaches the mixing chamber from the top of the hob, by the same path that primary air.

Les brûleurs du deuxième type, connus d'après le FR-A-1 197 178 (SAUTER), comportent une chambre de mélange ouverte latéralement, permettant de prélever l'air primaire dans la région de l'appareil située en-dessous de la table de cuisson. Ces brûleurs ont une médiocre résistance aux coups de vent susceptibles de survenir en-dessous de la table de cuisson, par exemple en cas de fermeture ou d'ouverture brusque d'une porte d'accès au volume situé sous la table de cuisson.The second type of burners, known from FR-A-1 197 178 (SAUTER), have an open mixing chamber laterally, allowing primary air to be taken from the region on the appliance located below the hob. These burners have poor wind resistance likely to occur below the cooktop, for example example in case of abrupt closing or opening of a door access to the volume located under the hob.

Le FR-A- 2 507 743 décrit un brûleur combinant une alimentation radiale d'air primaire au-dessus de la table de cuisson avec le montage de l'injecteur dans un manchon vertical formant autour de l'injecteur une ouverture annulaire pour l'admission principale d'air primaire provenant de sous la table de cuisson. Ce brûleur reste sensible aux coups de vent sous la table de cuisson.FR-A- 2 507 743 describes a burner combining a radial primary air supply above the hob with the injector mounted in a vertical sleeve forming an opening around the injector ring for the main intake of primary air from under the Cooktop. This burner remains sensitive to gusts of wind under the hob.

Le but de l'invention est ainsi de proposer un brûleur à gaz présentant une grande souplesse d'emploi du point de vue de son montage, et/ou de la qualité de sa combustion même pour différentes sortes de gaz, et/ou de sa sécurité. The object of the invention is thus to propose a gas burner with great flexibility of use from the point of view of its assembly, and / or the quality of its combustion even for different kinds of gas, and / or its safety.

A ces fins, l'invention propose un brûleur à gaz selon le préambule de la revendication 1, lequel brûleur, étant agencé conformément à l'invention, se caractérise par les dispositions énoncées dans la partie caractérisante de la revendication 1.For these purposes, the invention provides a gas burner according to the preamble of claim 1, which burner, being arranged in accordance with the invention, is characterized by the provisions set out in the part Characterizing of claim 1.

Grâce à son alimentation mixte en air primaire, par un trajet principal orienté radialement comme dans les brûleurs connus à alimentation par le dessus de la table de cuisson et par un trajet complémentaire à travers la cuve, le brûleur selon l'invention assure une très forte aération primaire, donc une excellente qualité de combustion notamment au regard des normes sur le taux maximal de monoxyde de carbone. En outre, le brûleur est étonnamment efficace contre les risques d'extinction de la flamme.Thanks to its mixed supply of primary air, by a main path oriented radially as in Known top-of-the-table burners and by a complementary path through the tank, the burner according to the invention ensures a very high aeration primary, therefore excellent combustion quality especially with regard to the standards on the maximum rate of carbon monoxide. In addition, the burner is surprisingly effective against the risk of flame extinction.

Il est en particulier surprenant de constater que la présence des deux trajets, au lieu d'additionner les risques présentés par chacun d'eux, a au contraire pour vertu de les éliminer. Ainsi, si le trajet principal se trouve obturé, le trajet complémentaire assure tout de même une certaine aération primaire. Comme le trajet à travers la cuve n'est qu'un trajet complémentaire, assurant un débit d'air par exemple environ cinq fois inférieur au trajet principal, sa section de passage est faible et ne permet pas aux coups de vent d'atteindre la chambre de mélange. En outre, le trajet secondaire constitue un orifice d'évacuation des ' substances susceptibles de parvenir accidentellement dans la chambre de mélange par le trajet primaire. Cette sécurité est notamment assurée lorsque, conformément à une particularité optionnelle de l'invention, le trajet complémentaire débouche en un point bas de la chambre de mélange.It is in particular surprising to note that the presence of the two routes, instead of adding the risks presented by each of them, has at on the contrary, by virtue of eliminating them. So if the ride main is closed, the additional path ensures still some primary ventilation. As the path through the tank is only a complementary path, ensuring an air flow for example about five times lower than the main path, its passage section is weak and does not allow gales to reach the mixing chamber. In addition, the secondary route constitutes a discharge port for 'substances likely to accidentally enter the room mixing by the primary path. This security is particularly insured when, in accordance with a specific feature optional of the invention, the complementary route opens at a low point in the mixing chamber.

Le trajet complémentaire est aménagé pour fournir, en cas d'obturation du trajet principal, une aération primaire juste suffisante pour satisfaire aux normes relatives aux taux maximum de monoxyde de carbonne dans les gaz de combustion produits par la flamme du brûleur. Ainsi, la section du trajet complémentaire est aussi petite que possible pour que tous les avantages ci-dessus soient obtenus de manière optimale. Ainsi le trajet complémentaire doit être aménagé pour fournir une aération primaire correspondant à environ 10% de la valeur stoechiométrique nécessaire pour le gaz de pétrole liquéfié, qui est le combustible le plus difficile. Ces 10% s'ajoutent aux 50% que le trajet principal de l'air primaire est capable de fournir. Le brûleur totalise donc liquéfié, qui est le combustible le plus difficile. Ces 10% s'ajoutent aux 50% que le trajet principal de l'air primaire est capable de fournir. Le brûleur totalise donc une aération primaire correspondant à 60% de l'aération stoechiométrique. Ceci est remarquable et permet ensuite, grâce à l'aération secondaire, une combustion produisant des taux de monoxyde de carbone très faibles, situés très en-dessous des normes actuellement en vigueur.The additional route is arranged to provide, if the main route is blocked, a primary ventilation just sufficient to meet standards for maximum levels of carbon monoxide in the combustion gases produced by the flame of the burner. So the section of the complementary path is as small as possible so that all of the above benefits are obtained optimally. So the path additional must be fitted to provide primary ventilation corresponding to approximately 10% of the stoichiometric value required for petroleum gas which is the most difficult fuel. These 10% add to the 50% that the main air path primary is able to provide. The burner therefore totals which is the most difficult fuel. This 10% is added to 50% that the primary path of primary air is capable of providing. The burner therefore totals primary ventilation corresponding to 60% of stoichiometric aeration. This is remarkable and then allows, through secondary aeration, combustion producing rates of very low carbon monoxide, well below standards currently in force.

Selon un perfectionnement important de l'invention, il a été trouvé que le trajet d'air primaire s'étendant entre les moyens d'arrivée d'air primaire et la cuve peut être réalisé avec une perte de charge très diminuée par rapport aux réalisations actuellement connues. En particulier, la partie axiale du venturi, conduisant au col et au divergent orientés radialement, peut être considérablement raccourcie sans dégrader le fonctionnement du venturi. On est ainsi en mesure de réaliser un trajet radial sensiblement rectiligne contenu dans un plan perpendiculaire à l'axe du brûleur, et ceci sans que la hauteur du brûleur soit augmentée. On réduit ainsi considérablement les pertes de charge le long de ce trajet. Il en résulte une meilleure aération primaire, donc une meilleure combustion. Il n'est donc plus nécessaire que le trajet d'air primaire passe par des chicanes génératrices de pertes de charge. Ces chicanes étaient destinées selon l'état de la technique à améliorer une combustion difficile en contraignant l'air primaire à lécher des parois chaudes avant de se mélanger avec le gaz.According to an important improvement of the invention, it has been found that the primary air path extending between the inlet means primary air and the tank can be produced with a very low pressure drop decreased compared to the currently known achievements. In particular, the axial part of the venturi, leading to the neck and diverging radially oriented, can be considerably shortened without degrading the operation of the venturi. We are thus able to achieve a substantially straight radial path contained in a plane perpendicular to the axis of the burner, and this without the height of the burner is increased. This considerably reduces the losses of charge along this route. This results in better ventilation primary, therefore better combustion. It is therefore no longer necessary that the primary air path passes through baffles generating pressure losses. These baffles were intended according to the state of the technique to improve difficult combustion by restricting air primer to lick hot walls before mixing with gas.

D'autres particularités et avantages de l'invention résulteront encore de la description ci-après. Other features and advantages of the invention will result still from the description below.

Aux dessins annexés, donnés à titre d'exemples non-limitatifs:

  • la figure 1 est une vue, partiellement en coupe axiale, d'un brûleur selon l'invention;
  • la figure 2 est une vue partielle du brûleur selon la figure 1, en coupe selon le plan II;
  • la figure 3 est une vue analogue à la figure 1, mais avec coupe partielle dans un autre demi-plan axial;
  • la figure 4 est une vue, avec coupe axiale et perspective, du brûleur de la figure 3, illustrant le démontage de la bougie d'allumage;
  • la figure 5 est une vue d'un détail en coupe selon V-V de la figure 3;
  • la figure 6 est une vue d'un détail selon VI-VI de la figure 4;
  • la figure 7 est une demi-vue du brûleur, en coupe selon un autre plan axial;
  • la figure 8 est une vue partielle en perspective illustrant le démontage du détecteur de flamme de la figure 7;
  • la figure 9 est une vue en coupe selon IX-IX de la figure 7;
  • la figure 10 est un détail en coupe axiale, à échelle agrandie, du raccordement du brûleur avec une canalisation de gaz; et
  • la figure 11 est une vue en demi-coupe illustrant les procédés de montage et d'utilisation selon l'invention.
In the appended drawings, given by way of non-limiting examples:
  • Figure 1 is a view, partially in axial section, of a burner according to the invention;
  • Figure 2 is a partial view of the burner according to Figure 1, in section on plane II;
  • Figure 3 is a view similar to Figure 1, but with partial section in another axial half-plane;
  • Figure 4 is a view, in axial section and perspective, of the burner of Figure 3, illustrating the disassembly of the spark plug;
  • Figure 5 is a view of a detail in section along VV of Figure 3;
  • Figure 6 is a view of a detail according to VI-VI of Figure 4;
  • Figure 7 is a half view of the burner, in section along another axial plane;
  • Figure 8 is a partial perspective view illustrating the disassembly of the flame detector of Figure 7;
  • Figure 9 is a sectional view along IX-IX of Figure 7;
  • Figure 10 is a detail in axial section, on an enlarged scale, of the connection of the burner with a gas pipe; and
  • FIG. 11 is a half-section view illustrating the assembly and use methods according to the invention.

Dans l'exemple représenté à la figure 1, le brûleur à gaz comprend une cuve 1 de forme générale tronconique. Le bord supérieur ouvert de la cuve comporte une bride périphérique 2 destinée à être fixée contre la face inférieure d'une table de cuisson 3, au moyen de vis 4. La table de cuisson 3 présente une ouverture axiale 5 par rapport à laquelle se centre l'extrémité ouverte de la cuve 1. Le fond de la cuve 1 porte un injecteur de gaz combustible 6 monté de facon à libérer le gaz combustible 7 en un jet s'étendant vers le haut selon l'axe vertical 8 de la cuve 1 et de l'ouverture 5. L'intérieur de la cuve 1 constitue une chambre de mélange 9 dans laquelle le gaz 7 est destiné à se mélanger avec de l'air comburant dit air "primaire", prélevé dans l'atmosphère.In the example shown in Figure 1, the burner to gas comprises a tank 1 of generally frustoconical shape. The open top edge of tank has flange device 2 intended to be fixed against the face bottom of a hob 3, using screws 4. The hob 3 has an axial opening 5 through relation to which the open end of the tank is centered 1. The bottom of the tank 1 carries a gas injector fuel 6 mounted to release combustible gas 7 in a jet extending upwards along the vertical axis 8 of the tank 1 and the opening 5. The interior of the tank 1 constitutes a mixing chamber 9 in which the gas 7 is intended to mix with combustion air called air "primary", taken from the atmosphere.

Pour l'alimentation de la cuve 9 en air primaire, un trajet principal d'air primaire il est aménagé entre la face supérieure de la table de cuisson 3 et la face inférieure d'une paroi 12 qui appartient à un corps supérieur 17 du brûleur. La paroi 12 est terminée, radialement vers l'extérieur, par une jupe 13 orientée obliquement vers le bas, donc vers la face supérieure de la table de cuisson 3. Le bord libre 14 de la jupe 13 et la face supérieure de la table de cuisson 3 définissent entre eux un intervalle d'entrée annulaire pour l'air primaire principal sur tout le pourtour du brûleur. Le corps supérieur 17 appartient à une superstructure 16 du brûleur. Celle-ci comprend en outre un couvercle 18 coiffant le corps supérieur 17. Le corps supérieur 17 comprend un trou central défini par un collet 19 saillant vers la chambre de mélange 9 selon l'axe 8 et destiné à conduire le mélange de gaz et d'air primaire dans un venturi radial défini antre une face supérieure du corps supérieur 17 et une face inférieure sensiblement plane du couvercle 18. Le venturi radial comprend, à partir de l'extrémité supérieure au collet 19, opposée à l'injecteur 6, un col 21 du venturi et un divergent 22 s'étendant radialement vers l'extérieur à partir au col 21. Le divergent forme pour le mélange une section de passage qui croít très rapidement, grâce à l'augmentation cumulative du diamètre, et de la distance entre la face supérieure 23 du corps supérieur 17 et la face inférieure du couvercle 18. Le divergent 22 débouche dans une chambre annulaire de reprise de pression 24 qui est séparée du trajet principal 11 par la paroi 12. Radialement à l'extérieur, la chambre de reprise de pression 24 est limitée par une paroi latérale 26 dont le bord supérieur est crénelé et supporte le couvercle 18. Les créneaux forment des orifices de flamme 27, limités supérieurement par le couvercle 18.For supplying the tank 9 with primary air, a main path of primary air it is arranged between the upper side of the hob 3 and the side bottom of a wall 12 which belongs to a body upper 17 of the burner. The wall 12 is finished, radially outwards, by a skirt 13 oriented obliquely downwards, so towards the upper face of the hob 3. The free edge 14 of the skirt 13 and the upper surface of the hob 3 define between them an annular inlet interval for primary air main around the entire burner. The body upper 17 belongs to a superstructure 16 of the burner. This further comprises a cover 18 covering the upper body 17. The upper body 17 includes a hole central defined by a collar 19 projecting towards the mixture 9 along axis 8 and intended to conduct the mixture of gas and primary air in a defined radial venturi an upper face of the upper body 17 and a face substantially flat bottom of the cover 18. The venturi radial includes, from the upper end to collar 19, opposite the injector 6, a collar 21 of the venturi and a divergent 22 extending radially outwardly start at collar 21. The divergent forms for the mixture a passage section which grows very quickly, thanks to cumulative increase in diameter, and distance between the upper face 23 of the upper body 17 and the underside of the cover 18. The divergent 22 opens out in an annular pressure relief chamber 24 which is separated from the main path 11 by the wall 12. Radially outside, the recovery chamber of pressure 24 is limited by a side wall 26 whose upper edge is crenellated and supports the cover 18. The slots form flame openings 27, limited above by the cover 18.

Suivant une particularité importante de l'invention, le plan 28 contenant le bord libre 14 de la jupe 13 s'étend entre l'injecteur 6 et le bora libre 29 du collet 19. Il en va de même du plan de la face supérieure de la table de cuisson 3 dans la région sensiblement plane qui définit le trajet principal 11. Autrement dit, le collet 19 ne fait pas saillie vers le bas par rapport à un plan radial (sensiblement le plan 28) contenant le trajet principal 11. Ce dernier peut donc être sensiblement rectiligne jusqu'à ce qu'il doive changer de direction pour pénétrer dans le collet 19. Ceci est obtenu sans augmenter la hauteur totale du brûleur, par simple réduction de la longueur du collet 19, par rapport aux réalisations classiques.According to an important feature of the invention, the plane 28 containing the free edge 14 of the skirt 13 extends between the injector 6 and the free bora 29 of the collar 19. It the same goes for the plane of the upper face of the table cooking 3 in the substantially flat region which defines the main path 11. In other words, the collar 19 does not not protruding downward from a radial plane (substantially the plane 28) containing the main path 11. The latter can therefore be substantially straight up to what he must change direction to enter the collar 19. This is obtained without increasing the total height of the burner, by simply reducing the length of the collar 19, compared to conventional embodiments.

Suivant l'invention, la chambre de mélange 9 est en outre alimentée par un trajet d'air primaire complémentaire 31 comprenant une ouverture complémentaire 32 formée à travers la paroi de la cuve. L'ouverture complémentaire 32 s'étend à travers un bossage 33 de la face extérieure de la cuve 1, et débouche dans la chambre de mélange 9 en un point bas de la cuve, à proximité de l'injecteur 6. Parallèlement à son axe, l'ouverture 32 présente une certaine longueur, conférant au flux d'air qui la traverse une certaine directivité, et rendant ce flux d'air relativement insensible aux flux indésirables qui peuvent exister à proximité des parois externes de la cuve 1. Grâce à la disposition avantageuse qui vient d'être décrite pour l'ouverture complémentaire 32, le trajet complémentaire 31 est quasiment rectiligne et parallèle au flux de gaz 7 pénétrant dans le collet 19. Ainsi, une ou plusieurs ouvertures 32 de petite section assurent un écoulement substantiel avec une perte de charge réduite.According to the invention, the mixing chamber 9 is in additionally supplied by an additional primary air path 31 comprising a complementary opening 32 formed at through the wall of the tank. The complementary opening 32 extends through a boss 33 on the outer face of the tank 1, and opens into the mixing chamber 9 in one low point of the tank, near the injector 6. Parallel to its axis, the opening 32 has a certain length, giving the air flow passing through it some directivity, and making this air flow relatively insensitive to unwanted flows which can exist near the outer walls of the tank 1. Thanks to the advantageous arrangement which has just been described for the complementary opening 32, the complementary path 31 is almost straight and parallel to the gas flow 7 entering the collar 19. Thus, one or more small section openings 32 provide flow substantial with reduced pressure drop.

Grâce à l'effet venturi, le jet de gaz 7 entraíne avec lui jusqu'à la chambre de reprise de pression 24 et aux orifices de flammes 27 l'air primaire arrivant par le trajet principal 11 et par le trajet complémentaire 31. Il a été trouvé avantageux selon l'invention que le trajet principal 11 assure une aération correspondant à environ 50% de la valeur stoechiométrique et que le trajet complémentaire 31 assure une aération correspondant à 10% de la valeur stoechiométrique pour le gaz de pétrole liquéfié. Lorsque ce mélange sort par les orifices 27, une aération secondaire a lieu, avec de l'air prélevé dans l'atmosphère environnant la face extérieure de la paroi latérale 26. Avec une aération primaire correspondant à 60% de la valeur stoechiométrique, le complément attendu de l'aération secondaire est facilement réalisable et les normes sur les résidus de combustion sont largement respectées.Thanks to the venturi effect, the gas jet 7 drives with him to the pressure relief chamber 24 and to flame openings 27 the primary air arriving through the main path 11 and the complementary path 31. It has been found advantageous according to the invention that the journey main 11 provides ventilation corresponding to approximately 50% of the stoichiometric value and that the journey additional 31 provides ventilation corresponding to 10% stoichiometric value for petroleum gas liquefied. When this mixture leaves through the orifices 27, a secondary ventilation takes place, with air taken from the atmosphere surrounding the outside of the wall lateral 26. With primary ventilation corresponding to 60% of the stoichiometric value, the expected complement of secondary ventilation is easily achievable and combustion residue standards are largely respected.

Même si la table de cuisson 3 est fortement inondée au point d'obturer l'ouverture entre la table de cuisson 3 et le bord libre 14 de la jupe 13, une aération primaire suffisante est encore assurée par le trajet 31.Even if hob 3 is heavily flooded with point of closing the opening between the hob 3 and the free edge 14 of the skirt 13, a primary ventilation sufficient is still ensured by path 31.

La contribution égale à 10% de la valeur stoechiométrique, assurée normalement par le trajet complémentaire 31, a été choisie pour que le trajet 31 assure tout juste une combustion respectant les normes sur les émissions de monoxyde de carbone lorsque, en cas d'incident de fonctionnement, le trajet principal il est inopérant. On préfère selon l'invention ne pas augmenter les capacités d'alimentation en air primaire par le trajet complémentaire 31, car on souhaite aussi minimiser les risques qu'un coup de vent autour de la face extérieure de la cuve 1 vienne perturber la combustion en passant par le trajet complémentaire tel que 31.The contribution equal to 10% of the value stoichiometric, normally provided by the route 31, was chosen so that the route 31 just provides combustion that meets standards on carbon monoxide emissions when, in the event operating incident, the main route is inoperative. It is preferred according to the invention not to increase the primary air supply capacities by the path complementary 31, because we also want to minimize the risk of a gust of wind around the outside of the tank 1 comes to disturb the combustion by passing through the complementary path such as 31.

Il a été trouvé selon l'invention qu'une section de passage de l'ordre de 13mm2 pour le trajet complémentaire 31 était appropriée. De facon surprenante, la section de passage adéquate semble indépendante ou quasimment indépendante de la puissance du brûleur, dans une gamme de brûleurs de conception identique. Elle peut varier selon la géométrie du brûleur, et pourrait être augmentée si les normes en vigueur sur le taux de monoxyde de carbonne deviennent plus sévères.It has been found according to the invention that a section of passage of the order of 13mm2 for the complementary path 31 was appropriate. Surprisingly, the section of adequate passage seems independent or almost independent of the burner output, in a range of identical design burners. It may vary depending on the burner geometry, and could be increased if the current carbon monoxide content standards become more severe.

La figure 2 illustre qu'on peut si on le souhaite avoir plus d'une ouverture complémentaire 32, qui peuvent alors être de plus petite section.Figure 2 illustrates that one can if one wishes to have more than one complementary opening 32, which can then be of smaller section.

L'entretien quotidien du brûleur selon l'invention est particulièrement simple. La superstructure se positionne sur la cuve 1 par des pieds de centrage 34 en laissant passer entre eux le trajet principal 11. La base des pieds 34 repose sur le bord de la cuve 1. La table de cuisson 3 forme, autour de l'ouverture 5, un dôme 37 de diamètre plus faible que le bord libre 14 de la jupe 13, de façon à faire apparaítre, radialement à l'extérieur du dôme, l'intervalle annulaire d'entrée du trajet principal 11 de l'air primaire.The daily maintenance of the burner according to the invention is particularly simple. The superstructure is positioned on the tank 1 by centering feet 34 leaving pass between them the main path 11. The base of the feet 34 rests on the edge of the tank 1. The hob 3 forms, around the opening 5, a dome 37 of more diameter weak than the free edge 14 of the skirt 13, so as to make appear, radially outside the dome, the interval entry ring of the main air path 11 primary.

Les figures 3 à 6 illustrent un aspect de l'invention relatif au montage d'une bougie d'allumage 41. L'extrémité active 42 de la bougie 41 est positionnée dans une alvéole de forme générale semi-circulaire 43 définie par la face externe de la paroi latérale 26 de la superstructure. L'un des orifices de flamme 27 est situé au fond (radialement intérieur) de cette alvéole 43, comme représenté aux figures 3, 4 et 5. Le dessus de l'alvéole est fermé par le couvercle 18. Cette alvéole qui débouche radialement vers l'extérieur, protège la bougie et notamment son extrémité active 42 à l'égard des dépôts d'aliments, mais a pour inconvénient de rendre plus difficile l'acheminement d'air secondaire pour l'allumage. En outre, dans les réalisations connues, le remplacement de la bougie est complexe et nécessite souvent, selon l'état de la technique, un démontage important de brûleur, rendant l'opération difficile pour l'utilisateur de l'appareil culinaire.Figures 3 to 6 illustrate one aspect of the invention relating to the mounting of a spark plug 41. The end active 42 of the candle 41 is positioned in a socket generally semicircular 43 defined by the face outer side wall 26 of the superstructure. Mon flame ports 27 is located at the bottom (radially interior) of this cell 43, as shown in Figures 3, 4 and 5. The top of the cell is closed by the cover 18. This cell which opens radially towards outside, protects the candle and in particular its end active 42 with respect to food depots, but has disadvantage of making it more difficult to supply air secondary for ignition. Furthermore, in the realizations known, replacing the candle is complex and Depending on the state of the art, often requires a major disassembly of the burner, making the operation difficult for the user of the culinary appliance.

Suivant cet aspect de l'invention, la bougie est démontable depuis le dessus de la table de cuisson. Pour cela, le corps de la bougie s'étend à travers une oreille 44 de la bride périphérique 2 de la cuve 1. En outre, la bougie 41 présente une platine de fixation latérale 46 qui se place sur la face supérieure de l'oreille 44 et peut être vissée à l'oreille 44 au moyen d'une vis 47. La platine 46 s'étend vers l'axe 8 du brûleur.According to this aspect of the invention, the candle is removable from above the hob. For that, the body of the candle extends through one ear 44 of the peripheral flange 2 of the tank 1. In addition, the spark plug 41 has a lateral fixing plate 46 which is placed on the upper face of the ear 44 and can be screwed to the ear 44 by means of a screw 47. The plate 46 extends towards the axis 8 of the burner.

A son extrémité inférieure, donc située sous la table de cuisson 3 et sous l'oreille 44, le corps 45 de la bougie 41 porte une patte de connexion 49 raccordée à un fil d'alimentation haute tension 48. Après extraction de la vis 47, l'ensemble comprenant la bougie 41 et l'extrémité adjacente du fil 48 peut être ciré au-dessus de la table de cuisson 3, ceci après éloignement de la superstructure 16, comme représenté à la figure 4. Dans cette situation, il est possible de débrancher le fil 48, de remplacer la bougie 41 par une bougie neuve identique, de rebrancher le fil 48 sur la patte de connexion 49 puis de remonter la bougie 41 au moyen de la vis 47. Comme le montre la figure 6, le pourtour de l'ouverture 5 de la table de cuisson 3 forme une échancrure 52 dans laquelle s'emboíte la face supérieure de l'oreille 44.At its lower end, therefore located under the table cooking 3 and under the ear 44, the body 45 of the candle 41 carries a connection lug 49 connected to a wire high-voltage power supply 48. After extraction of the screw 47, the assembly comprising the candle 41 and the end adjacent to the wire 48 can be waxed above the table firing 3, this after removal of the superstructure 16, as shown in Figure 4. In this situation, there is possible to disconnect the wire 48, to replace the spark plug 41 by an identical new spark plug, reconnect the wire 48 on the connection tab 49 then reassemble the spark plug 41 using screw 47. As shown in the figure 6, the periphery of the opening 5 of the hob 3 forms a notch 52 into which the face fits upper ear 44.

A partir de la platine 46, le corps 45 de la bougie s'étend vers le haut à travers le trajet 11 de l'air primaire et à travers une ouverture 53 pratiquée dans la paroi 12. L'extrémité active 42 de la bougie dépasse ainsi dans l'alvéole 43 formant zone de flamme pour la flamme d'allumage. L'ouverture 53 est suffisamment grande pour ménager autour du corps 45 de la bougie un jeu substantiel formant un trajet 54 pour de l'air secondaire qui est prélevé dans le trajet 11 et aboutit dans l'alvéole 43 au débouché de l'orifice de flamme 27 associé à cette alvéole. L'allumage du brûleur est ainsi favorisé par un surcroít d'air secondaire.From plate 46, body 45 of the spark plug extends upward through path 11 of air primary and through an opening 53 made in the wall 12. The active end 42 of the spark plug thus protrudes in cell 43 forming a flame zone for the flame ignition. The opening 53 is large enough to leave a substantial play around the body of the candle 45 forming a path 54 for secondary air which is taken in path 11 and ends up in cell 43 at outlet of the flame orifice 27 associated with this cell. The ignition of the burner is thus favored by an additional secondary air.

Les figures 7 à 9 sont relatives à un autre aspect de l'invention concernant le montage d'un détecteur de flamme destiné à commander la coupure de l'alimentation en gaz lorsque l'échauffement résultant de la présence de la flamme disparaít.Figures 7 to 9 relate to another aspect of the invention relating to the mounting of a flame detector intended to control the cut off of the gas supply when the overheating resulting from the presence of the flame disappears.

Le FR-A-2 660 309 décrit comment un tel détecteur peut être réalisé au moyen d'un thermo-couple. La soudure 61 sensible à la température, formant l'extrémité libre supérieure du thermocouple 64, est placée sensiblement à mi-distance entre les axes de deux orifices de flamme 27 disposés au fond d'une alvéole 62 formée par la face extérieure de la paroi latérale 26 de la superstructure. Le FR-A-2 660 309 décrit également d'autres dispositions possibles, également compatibles avec le présent aspect de l'invention, avec notamment un seul orifice de flamme influençant la soudure 61 du thermocouple.FR-A-2 660 309 describes how such a detector can be achieved by means of a thermocouple. The welding 61 sensitive to temperature, forming the free end thermocouple 64, is placed substantially at mid-distance between the axes of two flame orifices 27 arranged at the bottom of a cell 62 formed by the face exterior of the side wall 26 of the superstructure. The FR-A-2 660 309 also describes other provisions possible, also consistent with this aspect of the invention, in particular with a single flame orifice influencing the solder 61 of the thermocouple.

Le thermocouple comprend à peu près au milieu de sa hauteur une patte de connexion 63. Suivant le présent aspect de l'invention, le thermocouple 64 est fixé au brûleur de manière particulièrement simple en pinçant la partie proximale 66 de la patte 63 entre la face inférieure de la table de cuisson 3 et une oreille 67 de la bride 2 de la cuve 1. L'oreille 67 présente sur sa face supérieure un évidement 68 pour accueillir l'épaisseur de la partie proximale 66, et un trou 69 pour le passage de la partie inférieure du thermocouple vers le bas. La table de cuisson 3 présente un trou 71 pour permettre à la partie supérieure du thermccouple de s'étendre vers le haut à travers le trajet d'air primaire 11. Celui-ci refroidit la soudure froide (non visible sur les figures) du thermocouple. Le thermocouple s'étend ensuite à travers une ouverture 72 formée dans la paroi 12 séparant le trajet 11 d'une part et le volume de l'alvéole 62 d'autre part. L'ouverture 72 est dimensionnée de facon à présenter un jeu considérable autour du thermocouple 64 de facon qu'un flux d'air secondaire, prélevé sur le trajet d'air primaire 11, passe par ce jeu dans l'alvéole 62 et favorise l'entretien des flammes 73 léchant la soudure chaude 61 du thermocouple. The thermocouple includes roughly in the middle of its height of a connection lug 63. According to the present aspect of the invention, the thermocouple 64 is fixed to the particularly simple burner by pinching the proximal part 66 of lug 63 between the underside of the hob 3 and an ear 67 of the flange 2 of the tank 1. The ear 67 has on its upper face a recess 68 to accommodate the thickness of the part proximal 66, and a hole 69 for the passage of the part thermocouple down. The hob 3 has a hole 71 to allow the upper part of the thermccouple to extend upward through the primary air path 11. This cools the weld thermocouple (not visible in the figures). The thermocouple then extends through an opening 72 formed in the wall 12 separating the path 11 on the one hand and the volume of the cell 62 on the other hand. The opening 72 is sized to present considerable play around thermocouple 64 so that an air flow secondary, taken from the primary air path 11, passes by this play in the cell 62 and promotes the maintenance of flames 73 licking the hot solder 61 of the thermocouple.

La figure 10 concerne un perfectionnement relatif au raccordement de l'injecteur 6 (non représenté à cette figure) avec une canalisation de gaz 81. La cuve 1 est réalisée de manière à comporter, venu de moulage, un raccord 83 permettant de fixer la canalisation de gaz 81 à la cuve 1 dans une position ou cette canalisation communique avec l'injecteur 6 par un conduit 82 également venu de moulage (voir aussi figure 1). Le raccord 83 forme un élargissement à l'extrémité ouverte du conduit 82. Cet élargissement est défini par une surface inférieure cylindrique filetée 84 terminée à l'intérieur par un épaulement conique convexe 86. Le filetage 84 est destiné à recevoir une douille de serrage 87 filetée extérieurement et présentant à son extrémité tournée vers l'épaulement conique convexe 86 une face conique concave correspondante 88. La canalisaton 81 présente à son extrémité un évasement ou collerette conique 89 destiné à être serré entre les faces 86 et 88 précitées. La collerette 89 comprend, à partir de la partie tubulaire de la canalisation 81, une partie 91 s'étendant coniquement vers l'extérieur, suivie par un rebord terminal 92 replié contre la face intérieure de la partie 91. La collerette terminale 89 a une élasticité axiale due au repliage plus cu moins complet du rebord 92 contre la partie 91. Ainsi, la collerette conique 89 forme ressort entre les faces 86 et 88. Ceci empêche tout désserage de la douille 87, quelles que soient les variations de température, et les différences de dilatation qui peuvent en résulter entre la matière de la cuve 1, de la douille 87 et de la canalisation 81.FIG. 10 relates to an improvement relating to the connection of injector 6 (not shown in this figure) with a gas pipe 81. The tank 1 is produced in such a way as to include, when molded, a fitting 83 for fixing the gas pipe 81 to tank 1 in a position or this pipe communicates with the injector 6 via a conduit 82 also coming from molding (see also figure 1). Fitting 83 forms a widening at the open end of the conduit 82. This enlargement is defined by a lower surface cylindrical threaded 84 terminated inside by a convex conical shoulder 86. The thread 84 is intended for receive an externally threaded clamping sleeve 87 and having at its end facing the shoulder convex conical 86 a corresponding concave conical face 88. Pipe 81 has a flare at its end or conical flange 89 intended to be clamped between the faces 86 and 88 above. The collar 89 comprises, at from the tubular part of the pipe 81, a part 91 extending conically outwards, followed by a terminal flange 92 folded against the inner face of part 91. The terminal flange 89 has a axial elasticity due to the more or less complete folding of the flange 92 against part 91. Thus, the conical flange 89 forms a spring between the faces 86 and 88. This prevents any loosening of the socket 87, whatever the temperature variations, and differences in expansion which may result between the material of the tank 1, of the socket 87 and the pipe 81.

La figure 11 visualise les procédés selon l'invention. Un brûleur pouvant être strictement identique à celui ou à ceux décrits jusqu'à présent, et par conséquent capable d'être monté comme il a été dit jusqu'à présent relativement à la table de cuisson 3, peut également être monté sur une table de cuisson 103 qui est conformée de façon que le bord libre 14 de la jupe 13 vienne en contact sensiblement étanche avec la face supérieure de la table de cuisson 103. Pour cela, le dôme 37 présente un sommet plan dont le diamètre est agrandi, pour être désormais supérieur à celui du bord libre 14 de la jupe 13. Une table de travail entièrement plane serait également concevable. En outre, la table de cuisson 103 présente dans la région annulaire située entre le bord de la cuve 1 et le bord libre de la jupe 13, des passages traversants 101 qui font communiquer le trajet d'air primaire 11 avec la région située sous la table de travail 103. Ainsi, le brûleur décrit est capable, par simple différence de la forme de la table de cuisson, de fonctionner en brûleur prélevant au moins une partie substantielle de son air primaire au-dessus de la table de cuisson ou au contraire en brûleur ne prélevant de l'air primaire que sous la table de cuisson.Figure 11 shows the processes according to the invention. A burner can be strictly identical to the one or those described so far, and by therefore capable of being mounted as has been said up present relative to hob 3, can also be mounted on a cooktop 103 which is shaped so that the free edge 14 of the skirt 13 comes into substantially sealed contact with the face top of the cooktop 103. For this, the dome 37 has a flat top whose diameter is enlarged, to be now greater than that of the free edge 14 of skirt 13. A fully flat work table would be also conceivable. In addition, the cooktop 103 present in the annular region located between the edge of the tank 1 and the free edge of the skirt 13, passages through 101 which communicate the air path primary 11 with the region under the work table 103. Thus, the burner described is capable, by simple difference in the shape of the hob, operate as a burner taking at least part substantial of its primary air above the table cooking or on the contrary in a burner not taking air primary than under the hob.

Bien entendu, l'invention n'est pas limitée aux exemples décrits et représentés.Of course, the invention is not limited to examples described and shown.

On peut si on le préfère réaliser pour le trajet d'air complémentaire une entrée disposée par exemple horizontalement à une certaine hauteur de la cuve. Il n'est pas indispensable que cette entrée se fasse à travers un bossage.We can if we prefer to carry out for the journey complementary air an inlet arranged for example horizontally at a certain height of the tank. It is not not essential that this entry is made through a boss.

Concernant le montage du brûleur avec prise d'air primaire exclusivement sous la table de cuisson, il est possible de remplacer les passages 101 par des passages à travers la paroi de la cuve, sous la table de cuisson. Dans ce cas une cuve différente, à paroi latérale ajourée est nécessaire, par rapport aux brûleurs des figures 1 à 10. Par contre, la même superstructure est utilisable. La cuve différence est réalisable en usinant des trous à travers la paroi d'une cuve par ailleurs identique à l'une de celles des figures 1 à 11.Regarding the installation of the burner with air intake primary exclusively under the hob it is possible to replace passages 101 with passages to through the wall of the tank, under the hob. In in this case a different tank, with perforated side wall is necessary, compared to the burners of Figures 1 to 10. On the other hand, the same superstructure can be used. Tank difference is achievable by machining holes through the wall of a tank otherwise identical to one of those Figures 1 to 11.

Claims (20)

  1. Gas burner comprising:
    a vessel defining a mixing chamber (9),
    a gas injector (6) mounted in the bottom of the vessel and opening in line with an axis (8) of the mixing chamber,
    means for primary air inlet into the mixing chamber,
    a superstructure (16) placed above the mixing chamber and defining a venturi (21, 22) which has an open access orifice facing the injector and which leads to annularly distributed flame orifices (27),
    the primary air inlet means comprising a first path (11) converging towards the axis (8) of the mixing chamber (1) from at least one inlet means disposed in a ring about the periphery of the mixing chamber and a second path (31),
    characterised in that
    the said first path (11) is a substantially straight main path providing the majority of the primary air delivery,
    in that the bottom of the vessel (1) has at least one through-going opening (32) disposed beside the injector (6), with its axis substantially parallel to the said axis (8) of the mixing chamber, and being of minimal length, and
    in that the said second path is a complementary path (31) for primary air passing via the said through-going opening (32) of which the minimal length, along the said axis, is sufficient to produce, when suction prevails in the vessel (1), a substantially unidirectional flow with little sensitivity to the flows likely to exist outside the vessel, the said complementary path (31) being arranged to provide complementary primary aeration corresponding to about 10% of the stoichiometric value by the liquified petroleum gas so as to provide - in the event of blockage of the main path - primary aeration just sufficient to meet the standards relating to the maximum level of carbon monoxide in the combustion gasses produced by the flame of the burner.
  2. Burner as claimed in claim 1, characterised in that the complementary opening (32) opens into the vessel (1) at a low point thereof.
  3. Burner as claimed in claim 1 or 2, characterised in that the complementary opening (32) has a passage cross-section of the order of 13mm2.
  4. Burner as claimed in any one of claims 1 to 3, characterised in that the complementary opening (32) is formed through a protrusion (32) on the outer face of the vessel.
  5. Burner as claimed in any one of claims 1 to 4, characterised in that the main path (11) extends essentially along a radial plane (28).
  6. Burner as claimed in any one of claims 1 to 5, characterised in that the access orifice of the venturi is defined by a collar (19) orientated towards the injector (6), and in that a radial plane (28) passing through the access means extends between a free edge (29) of the collar (19) and the injector (6).
  7. Burner as claimed in any one of claims 1 to 5, characterised in that the access orifice of the venturi is defined by a collar (19) orientated towards the injector (6), in that the inlet means are defined under a free edge (14) of a peripheral skirt (13) of the superstructure (16), and in that the plane (28) containing the free edge (14) of the skirt (13) extends between the injector (6) and a free edge (29) of the collar (19).
  8. Burner as claimed in any one of claims 1 to 7, of which the vessel (1) is intended to be fixed to a cooking surface (3), characterised in that it includes an ignition plug (41) which can be extracted from the top of the cooking surface (3).
  9. Burner as claimed in claim 8, characterised in that the ignition plug (41) has, in a region intended to be located under the cooking surface (3), a connection (49) designed so that during extraction of the ignition plug the said connection draws with it a connection wire (48) above the cooking surface (3) so that during replacement of the ignition plug (41) the connection (49) of a new ignition plug can be connected to the wire (48) above the cooking surface (3) then the wire, the connection and the said region of the ignition plug are reinserted into their service position below the cooking surface.
  10. Burner as claimed in claim 8 or 9, characterised in that the ignition plug (41) protrudes into the region of the flames (43) via an opening (53) formed through a wall (12) in the superstructure (16) which separates the main path of the primary air (11) and the region of the flames (43).
  11. Burner as claimed in claim 10, characterised in that there is clearance between the ignition plug (41) and the said opening (53) provided through a wall of the superstructure, this clearance forming a passage (53) to channel - from the main path (11) for the primary air - a flow of secondary air intended for the flame ignited by the ignition plug.
  12. Burner as claimed any one of claims 8 to 11, characterised in that the ignition plug is provided with a fixing plate (16) intended to be fixed above the cooking surface (31) of the cooking apparatus by a fixing means (47) which can be released from the top of the cooking surface.
  13. Burner as claimed in claim 12, characterised in that the releaseable fixing means (47) comes into engagement with the vessel (1).
  14. Burner as claimed in any one of claims 1 to 11, characterised in that it has an ignition plug (41) protruding into the region of the flames of the burner, passing with substantial clearance through an opening (53) in a wall (12) of the superstructure (16) which separates the main path (11) for the primary air and the region of the flames.
  15. Burner as claimed in any one of claims 1 to 14, characterised in that it has a flame detector (64), in particular a thermocouple, fixed in the region of the base of the main path (11) for the primary air and extending, through the main path (11) and into the flame region (62) through an opening (72) provided in a wall (12) separating the main path (11) for the primary air and the region of the flames of the burner.
  16. Burner as claimed in claim 15, characterised in that there is clearance between the flame detector (64) and the said opening (72) provided in the wall, this clearance forming a passage for the secondary air which is drawn from the main path (11) for the primary air and supplies at least one flame adjacent to the flame detector.
  17. Burner as claimed in claim 15 or 16, the vessel (1) of which is intended to be fixed to a cooking surface (3) of the cooking apparatus, characterised in that - in order for it to be fixed - the detector (64) has a tab (66) which is held between the cooking surface (3) and a face for fixing the vessel (1) against the cooking surface (3).
  18. Burner as claimed in claim 17, characterised in that the tab (66) is placed against a lower face of the cooking surface and is extended by a electrical connection strip (63).
  19. Burner as claimed in any one of claims 1 to 18, characterised in that it has:
    gas-supply ducting (81);
    a connector (83) to connect one end of the ducting (81) to the injector (6);
    a tightening bushing (87) which can be screwed to the connector (83);
    the end of the ducting (81) has a conical flared region (89) formed, beginning at the body of the ducting, by a diverging part (91) followed by an edge (92) folded against the inner face of the diverging part;
    this conical flared region being gripped between a convex conical shoulder (86) of the connector (83) and a concave conical face (88) of the bushing (87).
  20. Burner as claimed in one of claims 1 to 18, characterised in that it has:
    gas-supply ducting (81);
    a connector (83) to connect one end of the ducting (81) to the injector (6);
    a tightening bushing (87) which can be screwed to the connector (83);
    the end of the ducting (81) of the tube having an outwardly protruding end flange (89) which is gripped between two facing faces (86, 88) respectively appertaining to the connector (83) and to the bushing (87);
    the flange (89) being shaped so as to be elastic in the axial direction.
EP96932620A 1996-09-19 1996-09-19 Gas burner, in particular for cooking apparatus Expired - Lifetime EP0932797B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR1996/001466 WO1998012475A1 (en) 1996-09-19 1996-09-19 Gas burner, in particular for cooking apparatus, and methods for mounting and use thereof

Publications (2)

Publication Number Publication Date
EP0932797A1 EP0932797A1 (en) 1999-08-04
EP0932797B1 true EP0932797B1 (en) 2003-10-29

Family

ID=9488917

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96932620A Expired - Lifetime EP0932797B1 (en) 1996-09-19 1996-09-19 Gas burner, in particular for cooking apparatus

Country Status (4)

Country Link
EP (1) EP0932797B1 (en)
ES (1) ES2210390T3 (en)
PT (1) PT932797E (en)
WO (1) WO1998012475A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2147076B1 (en) * 1997-03-14 2001-03-01 Sourdillon Sa GAS BURNER FOR KITCHENS, PERFECTED.
DE19931686A1 (en) * 1999-07-08 2001-01-11 Agt Gas Technology Gmbh Gas burners for cooking points of gas oven has top side of burner lid with vertical annular projection open upwards for peg-shaped projection that projects downwards on grid
FR2804496B1 (en) * 2000-01-28 2002-07-19 Sourdillon Sa MULTIPLE FLAME CROWN GAS BURNER
IT1315325B1 (en) * 2000-04-28 2003-02-10 Paolo Moresco GAS BURNER FOR HOB
ITPS20030017A1 (en) * 2003-04-18 2004-10-19 So M I Press Societa Metalli I Niettati Spa PERFECT CROWN FOR GAS STOVE BURNERS.
MY144248A (en) * 2004-10-28 2011-08-29 Electrolux Ab Improved cooking gas burner
EP2439454A1 (en) * 2010-10-11 2012-04-11 BSH Bosch und Siemens Hausgeräte GmbH Gas burner for a cooking device
CN104566374A (en) * 2013-10-12 2015-04-29 浙江莫尼厨具有限公司 Adjustable upper intake air combustor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1387633A (en) * 1971-05-19 1975-03-19 Cannon Ind Ltd Boiling burners for hotplates of domestic gas cookers
FR2507743B1 (en) * 1981-06-15 1986-05-30 Sabaf Spa BURNER FOR HEATERS AND GAS COOKING UNITS IN GENERAL
FR2663109B1 (en) * 1990-06-12 1992-09-11 Sourdillon Sa GAS BURNER WITH INCORPORATED FLAME DETECTION PROBE.
IT1268490B1 (en) * 1993-07-16 1997-03-04 Defendi Srl Off Mec DOUBLE CROWN GAS BURNER PARTICULARLY FOR BUILT-IN HOBS

Also Published As

Publication number Publication date
EP0932797A1 (en) 1999-08-04
PT932797E (en) 2004-03-31
WO1998012475A1 (en) 1998-03-26
ES2210390T3 (en) 2004-07-01

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