EP2187131A1 - Device for the detection of a recipient's presence on a cooktop on the gas burner - Google Patents

Device for the detection of a recipient's presence on a cooktop on the gas burner Download PDF

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Publication number
EP2187131A1
EP2187131A1 EP09175861A EP09175861A EP2187131A1 EP 2187131 A1 EP2187131 A1 EP 2187131A1 EP 09175861 A EP09175861 A EP 09175861A EP 09175861 A EP09175861 A EP 09175861A EP 2187131 A1 EP2187131 A1 EP 2187131A1
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EP
European Patent Office
Prior art keywords
burner
container
hob
detection
electrode
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Granted
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EP09175861A
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German (de)
French (fr)
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EP2187131B1 (en
Inventor
Dominique Comte
Pascal Fernandes
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Rosinox SAS
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Rosinox SAS
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    • 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
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges

Definitions

  • the present invention relates to a device for detecting the presence of a container on a hob at a gas burner, and a device for igniting and extinguishing a gas burner on a table.
  • cooking device provided with gas burners, in particular a device which makes it possible, when a container is present on said burner, to activate the ignition of the burner and, in the absence of said container, to control the extinguishing of the burner.
  • the speed of execution of the tasks to be performed is a high requirement.
  • the cooking is generally started using the maximum power of the burner which is then adjusted by the user. Then, it is very common that, when a cooking is completed or that one must carry out intermediate operations or expectations out of fire, is removed from the cooktop, a container without taking the time to extinguish this fire or even reduce its power. unnecessary energy results in unnecessary gas dissipation and therefore unnecessary energy consumption and a risk of accidents and significant injury for operators around.
  • an energy saving device for cooking hobs which includes a presence detector of a cooking vessel which detects in particular the withdrawal of said container from the hearth.
  • a detector which under the effect of the presence of the container puts in mechanical contact a rod with an electric contactor placed in series in the power supply circuit of the solenoid valve which controls the main injector of the burner.
  • This detector can be a part of the grid pivotally mounted between a non-use position in which it is held projecting slightly above the plane of the hob using a spring and a position of use in which it is lowered into the hob under the effect of a container that is placed on it.
  • This detector can also be a probe mounted projecting through the burner.
  • the gate or probe is lowered by the effect of the weight of a container which allows, by the control rod, to actuate the supply circuit of the solenoid valve and ignite the burner.
  • the grid or the probe are held protruding under the effect of spring and are in mechanical connection with the electric switch via a control rod, so as to move the contactor away from the hot zone of the fireplace.
  • the probe being within the burner itself, it is subjected to very high temperatures up to 700 ° C, so it is essential to move the spring sufficiently to ensure a correct operation, since if the burner is too close the spring does not withstand the surrounding temperatures. Also, we arrive at a bulky device.
  • such a detection device operates under the effect of the weight of the detected container, this container being of sufficient weight to allow the mechanical actuation of the probe particularly against the elastic return effect of a spring.
  • the probe under the effect of the weight of this object may cause ignition burner and cause accidents.
  • Heating tables have also been proposed in EP 0 478 061 provided with Joule, radiation or induction heating means having at least one presence detector which detects the presence of a container on at least one hearth, and control means for disabling or reducing the heating of the hearth , the heating table having a timer for reactivating the heating when the detector detects the refitting of the container to the extent that the absence has not lasted beyond a specified period.
  • the detection means may be of the weight-based type, the ultrasonic transceiver, the capacitive or inductive effect of the frequency variation of a high-frequency oscillating circuit, the fact of placing or depositing the cooking utensil influencing the frequency of oscillation which allows to detect or not the presence of the utensil.
  • detection means also do not allow to make a distinction on the type of object placed and are hardly feasible on barefire cooktops.
  • a similar device is also described in EP 0429120 .
  • the present invention therefore has for first purpose to provide a device for detecting the presence of a container on a hob at a burner which allows some recognition of the type of object placed on the hob.
  • the invention also aims to propose a device for igniting and extinguishing a gas burner on a hob provided with gas burners, the device comprising such a device for detecting the presence of a container. on a gas burner of a hob so as to control when detecting the presence of a container on said burner, the ignition of the burner and in the absence of said container, extinguishing the burner.
  • the invention relates to a device for detecting the presence of a container on a hob provided with at least one gas burner, characterized in that said device consists of an electric circuit powered by a source of low voltage electrical current, one of whose terminals is connected to the hob and more precisely to the grid of electrically conductive material of the hob and the other terminal is connected to an electrode housed in the burner level, so that in the presence of a container of electrically conductive material on the burner, said container comes into contact with the grid and with the electrode, the presence of the container being detected by closing the electrical circuit while the absence of a container is detected by the opening of the electric circuit.
  • the present invention therefore also relates to an automatic ignition and extinguishing device of a gas burner on a hob provided with at least one burner to said burner having a pilot, a thermocouple and a pipe supplying gas.
  • said gas burner controlled by a solenoid valve, characterized in that it comprises; means for detecting the presence of a container at the burner on the hob, consisting of the detection device consisting of an electric circuit powered by a low-voltage electrical source, one of whose terminals is connected to the hob and more precisely to the grid of electrically conductive material of the hob and the other terminal is connected to an electrode housed at the burner, so that in the presence of a container of electrically material conductor placed at the burner, said container comes into contact with the gate and with the electrode, the presence of the container being detected by closing the electrical circuit while the absence of the container is detected by the opening of the electrical circuit , and means for managing and processing the detection signal resulting from the opening and closing of the electrical circuit of the detection device for r control the opening of the
  • the low voltage alternating current source (for example 12V) and the management and processing means consist of conventional electronic components per se, grouped together on an electronic board connected to a mains power supply. It is also possible to provide a current amplifier to facilitate the detection itself in case of poor contact of the container with the electrode and / or the gate and timing means which control a delayed extinction of the burner with respect to the detection of the absence of a container on the burner.
  • the electrode is mounted in a bore passing through the burner body and the burner cap and is projected from the cap preferably so as to come substantially in the plane of the grid of the cooktop so as to come into contact with a container placed on the cooktop at the burner.
  • the electrode carries at its end an electrically conductive probe consisting of a probe body and a detection member mounted displaceable on said probe body between a position called non-detection in which said member is kept protruding from the grid of the hob and a so-called detection position in which said member is driven in displacement so as to disappear under a container
  • the sensing member held projecting ensures contact to close the circuit and thus allow detection of the container.
  • said detecting member is a lever pivotally mounted on the probe body about an axis on the body of the probe in a plane extending perpendicular to the hob, so that the lever having an end provided with 1 ballast, this weighted end maintains the opposite end protruding above the grid of the hob while allowing the pivoting of said lever when a container placed at the burner pushes said projecting end and ensures contact with the electrode via said lever and the probe body. As soon as the container is removed, the weighted end pivots the opposite end so as to bring it back.
  • Such pivotal mounting on a lever provided with a weighted end avoids having to use the detent means of the detecting member in position such as springs. So we offer a probe whose operation is guaranteed and reliable even within the burner and despite the high temperatures that prevail.
  • the probe body is also rotatably mounted around the electrode.
  • the projecting lever abuts against the container that pushes it, which causes the body of the probe to rotate on the electrode.
  • This rotation of the probe advantageously allows an erasure of said lever under the container risk of tearing it,
  • the invention also relates to a hob of the fireside type, intended more particularly for professional catering but not exclusively, provided with at least one gas burner and having an ignition device for automatically extinguishing said burner according to the invention.
  • FIG. 1 is a schematic view of a hob provided with a burner ignition and extinguishing device according to the invention
  • the figure 2 represents a longitudinal sectional view of a probe of the detection device according to the invention.
  • the device for detecting the presence of a cooking container 11 conventionally made of electrically conductive material such as stainless steel, aluminum, copper on a hob according to the invention is intended to equip a hob T provided of at least one gas burner 1.
  • a hob is generally itself made of electrically conductive materials.
  • the burner 1 is fed by a gas supply pipe G whose opening and closing is controlled by a valve 3 of conventional handling per se. Once the gas supply is open, the gas is guided to a pilot 4 and a thermocouple, in a conventional manner per se. Once the thermocouple has been heated, the gas can be guided to the burner 1 via a pipe 2 controlled by a solenoid valve 5.
  • the device for detecting the presence of a container consists of an electric circuit powered by a low-voltage electrical power source, one of whose terminals is connected by a conducting wire f1 to the ground m of the table of cooking. T and therefore to the grid 6 of electrically conductive material of the hob T and the other terminal is connected by a second lead f2 to an electrode 7 housed at the burner 1.
  • the electric circuit consisting of the low-voltage alternating current source, the gate 6 and the electrode 7 is open. To close this circuit, it is necessary to electrically connect the gate 6 to the electrode 7. Also, when placing at the burner 1, a cooking vessel 11 generally made of an electrically conductive material and that it- it rests on the one hand on the gate 6 and comes into contact with its bottom with the electrode 7, the electrical circuit is closed. Closing the electric circuit thus gives as information the presence of a cooking vessel 11. Moreover, this detection can be done only in the presence of an object closing the electrical circuit. Therefore, placing the hand on the burner or non-electrically conductive object does not lead to closing the electrical circuit and therefore is not detected.
  • the detection device thus described is integrated in an automatic ignition and extinguishing device of a gas burner which furthermore comprises means for managing and processing the signal resulting from detection (the closing or opening of the electrical circuit) for controlling the opening of the solenoid valve 5 when the presence of the container 11 is detected and the closing of said solenoid valve 5 when the absence of the container 11 is detected.
  • the low-voltage alternating current source as well as the signal management and processing means corresponding to the detection consist of conventional electronic components per se, grouped together on an electronic card C connected to a section A power supply. also provide on the electronic card, a current amplifier. In this way, even if the contact allowing the closing of the circuit is bad for example, the amplifier allows a detection signal that can be processed.
  • the electrical circuit can be directly the circuit supplying the solenoid valve 5, for example if the solenoid valve 5 operates at low voltage.
  • the closing and opening of the detection circuit directly controls the solenoid valve.
  • this closure of the electrical circuit constitutes a signal that the management and processing means process to trigger control means for the opening of the solenoid valve 5 of in order to allow the gas to pass to the hat 1a of the burner 1 which ignites in the presence of the pilot light 4. If the container 11 is removed, the circuit opens and the opening of the circuit constitutes a signal which, treated, allows to trigger the control means for closing the solenoid valve 5 so as to extinguish the burner 1.
  • This time delay makes it possible to extinguish the burner 1 after a fixed period, which may be previously determined as being an absence of the container 11 corresponding to a total withdrawal of the container from the fire.
  • the electrode 7 is mounted inside an insulating sheath 7a in a bore passing through the body 1b of the burner 1 and the burner cap 1a and is projecting from said cap 1b so as to come substantially under the Grid 6 plan of the T cooktop.
  • This electrode 7 carries at its end in the example represents a probe 8 comprising a probe body 9 of substantially conical shape provided with an orifice in which is housed the end of the electrode 7 and a detection member 10.
  • the low voltage alternating current produced from the electronic card therefore passes through the electrode 7, the probe 8 with the return by the mass m of the hob T, the container 11 closing the circuit in contact with the probe 8 and the gate 6 of the hob (on the figure 1 it can be seen that the container 11 is slightly above the grid 6 for the sake of clarity of the drawing).
  • This detection member 10 is pivotally mounted about an axis x extending parallel to the cooking table T, on said probe body 9 between a so-called non-detection position in which said member 10 is kept projecting relative to the grid 6 (see the figure 2 ) and a so-called detection position in which said member 10 is pivotally driven so as to fade under a container 11 placed on the gate 6 at the level of the burner 1.
  • This detection member is a lever 10 having an end 10a provided with a ballast and pivotally mounted on the body of the probe 9 in a plane extending perpendicularly to the hob T, so that the weighted end 10a maintains the opposite end 10b lighter, for example recessed, projecting above the grid 6 of the hob T while allowing the pivoting of said lever 10 when a container 11 placed on the gate 6 at the burner 1 regrows said projecting end 10b and ensures the contact between the gate 6 and the electrode 7 via said lever 10 and the probe body 9.
  • the weighted end 10a drives into position. pivoting the opposite end 10b so as to project it above the grid 6.
  • the probe body 9 is further mounted drivable in rotation around the electrode 7, about an axis y. In this way, when a container 11 is moved by simple sliding, the projecting lever 10b abuts against the container 11 and causes the body of the feeler 9 to rotate on the electrode 7. This rotation of the probe 8 allows an erasure said lever 10 under the container 11 without risk of tearing said lever 10.
  • This end 10b preferably has a rounded shape to facilitate erasure under the container 11.
  • the probe 8 is the electrode 7 are mounted in the center of the burner 1 and are therefore subjected to very high temperatures in operation but allowing detection of small containers.
  • the detection lever 10 does not need a spring to be returned to the non-detection position, so it is houseable in the center of the burner 1 without the very high operating temperatures do not interfere with its operation.
  • An electronic card may be provided for each burner 1 or an electronic card may be provided on which all the burners are managed.
  • the grid 6, the probe 8, the hat 1a of the burner, the body of the burner 1b and the bowl of cleanliness 12 of the hob T are removable for cleaning.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

The device has an electric circuit powered by a low voltage current source, where one of terminals of the current source is connected to an electrically conducting material grid (6) of a cooktop (T). The other terminal of the current source is connected to an electrode (7) placed at a level burner (1), such that an electrically conducting material container (11) on the burner is in contact with the grid and the electrode. Presence of the container is detected by closing operation of the electric circuit, where absence of the container is detected by opening operation of the electric circuit. An independent claim is also included for a cooktop with a gas-burner.

Description

La présente invention concerne un dispositif de détection de la présence d'un récipient sur une table de cuisson au niveau d'un brûleur à gaz, ainsi qu'un dispositif d'allumage et d'extinction d'un brûleur à gaz sur une table de cuisson pourvue de brûleurs à gaz, en particulier un dispositif qui permet lors de la présence d'un récipient sur ledit brûleur d'activer l'allumage du brûleur et lors de l'absence dudit récipient de commander l'extinction du brûleur.The present invention relates to a device for detecting the presence of a container on a hob at a gas burner, and a device for igniting and extinguishing a gas burner on a table. cooking device provided with gas burners, in particular a device which makes it possible, when a container is present on said burner, to activate the ignition of the burner and, in the absence of said container, to control the extinguishing of the burner.

Dans le domaine de la restauration professionnelle, la rapidité d'exécution des tâches à accomplir est une exigence élevée. De manière habituelle, on commence en général la cuisson en utilisant la puissance maximale du brûleur qui est ensuite réglé par l'utilisateur. Puis, il est très fréquent que, lorsqu'une cuisson est achevée ou que l'on doive effectuer des opérations intermédiaires ou des attentes hors feu, on retire de la table de cuisson, un récipient sans que l'on prenne le temps d'éteindre ce feu ou même de réduire sa puissance. énergétique inutile en résulte une dissipation inutile de gaz et donc une consommation énergétique inutile et un risque d'accidents et de blessure non négligeable pour les opérateurs autour.In the field of professional catering, the speed of execution of the tasks to be performed is a high requirement. Usually, the cooking is generally started using the maximum power of the burner which is then adjusted by the user. Then, it is very common that, when a cooking is completed or that one must carry out intermediate operations or expectations out of fire, is removed from the cooktop, a container without taking the time to extinguish this fire or even reduce its power. unnecessary energy results in unnecessary gas dissipation and therefore unnecessary energy consumption and a risk of accidents and significant injury for operators around.

On a donc proposé des dispositifs destinés à économiser l'énergie utilisée pendant la préparation et la cuisson d'aliments qui sont élaborés sur des brûleurs à gaz découverts.Devices have therefore been proposed to save the energy used during the preparation and cooking of foods that are made on open gas burners.

Ainsi, en particulier, on a proposé dans FR 2465 163 un dispositif économiseur d'énergie pour foyers de cuisson qui comprend un détecteur de présence d'un récipient de cuisson qui permet de détecter notamment le retrait dudit récipient hors du foyer. Un tel dispositif propose donc un détecteur qui sous l'effet de la présence du récipient met en contact mécanique une tige avec un contacteur électrique placé en série dans le circuit d'alimentation électrique de l'électrovanne qui contrôle l'injecteur principal du brûleur. Ainsi en absence de récipient sur le brûleur, la tige est écartée du contacteur et ouvre le circuit, la bobine de l'électrovanne n'étant pas alimentée en courant, celle-ci est fermée et le gaz ne parvient pas au brûleur, celui-ci étant donc éteint. Ce détecteur peut être une partie de la grille montée pivotante entre une position de non utilisation dans laquelle elle est maintenue en saillie légèrement au-dessus du plan de la table de cuisson à l'aide d'un ressort et une position d'utilisation dans laquelle elle est abaissée jusque dans le plan de cuisson sous l'effet d'un récipient qui est posé dessus. Ce détecteur peut également être un palpeur monté en saillie au travers du brûleur.Thus, in particular, it has been proposed in FR 2465 163 an energy saving device for cooking hobs which includes a presence detector of a cooking vessel which detects in particular the withdrawal of said container from the hearth. Such a device therefore proposes a detector which under the effect of the presence of the container puts in mechanical contact a rod with an electric contactor placed in series in the power supply circuit of the solenoid valve which controls the main injector of the burner. Thus, in the absence of a container on the burner, the rod is moved away from the contactor and opens the circuit, the coil of the solenoid valve is not supplied with current, the latter is closed and the gas does not reach the burner, this one so it is off. This detector can be a part of the grid pivotally mounted between a non-use position in which it is held projecting slightly above the plane of the hob using a spring and a position of use in which it is lowered into the hob under the effect of a container that is placed on it. This detector can also be a probe mounted projecting through the burner.

Ainsi, la grille ou le palpeur est abaissé sous l'effet du poids d'un récipient ce qui permet, par la tige de commande, d'actionner le circuit d'alimentation de l'électrovanne et d'allumer le brûleur. La grille ou le palpeur sont maintenus en saillie sous l'effet de ressort et sont en liaison mécanique avec le contacteur électrique par l'intermédiaire d'une tige de commande, de manière à éloigner le contacteur de la zone chaude du foyer. En outre, il est nécessaire également d'éloigner de la zone chaude de la table de cuisson le ressort qui permet de mettre en saillie le palpeur. En effet, on a pu constaté que le palpeur étant au sein même du brûleur, il est soumis à des températures très élevées allant jusqu'à 700°C, de sorte qu'il est indispensable d'éloigner le ressort de suffisante pour garantir un fonctionnement correct, dans la mesure où s'il est trop prêt du brûleur le ressort ne résiste pas aux températures environnantes. Aussi, on arrive alors à un dispositif encombrant.Thus, the gate or probe is lowered by the effect of the weight of a container which allows, by the control rod, to actuate the supply circuit of the solenoid valve and ignite the burner. The grid or the probe are held protruding under the effect of spring and are in mechanical connection with the electric switch via a control rod, so as to move the contactor away from the hot zone of the fireplace. In addition, it is also necessary to move away from the hot zone of the hob the spring that allows to project the probe. Indeed, it has been found that the probe being within the burner itself, it is subjected to very high temperatures up to 700 ° C, so it is essential to move the spring sufficiently to ensure a correct operation, since if the burner is too close the spring does not withstand the surrounding temperatures. Also, we arrive at a bulky device.

Dans la plupart des cas, on a préféré positionner un palpeur de ce type à actionnement mécanique à proximité du brûleur mais pas au sein même de ce brûleur. Ceci a pour résultat que les récipients de petites dimensions sons pas forcément détectés par un palpeur positionné à côté du brûleur.In most cases, it has been preferred to position a probe of this type with mechanical actuation close to the burner but not within this burner itself. This has the result that small containers are not necessarily detected by a probe positioned next to the burner.

Par ailleurs, un tel dispositif de détection fonctionne sous l'effet du poids du récipient détecté, ce récipient étant de poids suffisant pour permettre l'actionnement mécanique du palpeur notamment contre l'effet de rappel élastique d'un ressort. Or, si on pose sur la table de cuisson, autre chose qu'un récipient de cuisson, par exemple un plateau, une bassine, ou même une main, le palpeur sous l'effet du poids de cet objet, peut entraîner l'allumage du brûleur et provoquer des accidents.Moreover, such a detection device operates under the effect of the weight of the detected container, this container being of sufficient weight to allow the mechanical actuation of the probe particularly against the elastic return effect of a spring. However, if we put on the hob, something other than a cooking vessel, for example a tray, a bowl, or even a hand, the probe under the effect of the weight of this object, may cause ignition burner and cause accidents.

Des dispositifs de ce type réagissant au poids d'un objet ne présente donc pas une sécurité suffisante.Devices of this type reacting to the weight of an object does not therefore have sufficient security.

On a proposé également des tables chauffantes dans EP 0 478 061 , pourvu de moyens de chauffage par effet Joule, par rayonnement ou par induction et présentant au moins un détecteur de présence qui détecte la présence d'un récipient sur au moins un foyer, et des moyens de commande pour désactiver ou réduire le chauffage du foyer, la table chauffante comportant un temporisateur permettant de réactiver le chauffage lorsque le détecteur détecte la remise en place du récipient dans la mesure où l'absence n'a pas duré au-delà d'une durée déterminé. Les moyens de détection peuvent être du type par poids, par émetteur-récepteur d'ultrasons, par effet capacitif ou inductif de la variation de fréquence d'un circuit oscillant haute fréquence, le fait de poser ou déposer l'ustensile de cuisson influençant la fréquence d'oscillation ce qui permet de détecter ou non la présence de l'ustensile. Toutefois de tels moyens de détection ne permettent pas non plus de faire une distinction sur le type d'objet posé et en sont guère envisageables sur des table de cuisson à feux nus. Un dispositif similaire est également décrit dans EP 0429120 .Heating tables have also been proposed in EP 0 478 061 provided with Joule, radiation or induction heating means having at least one presence detector which detects the presence of a container on at least one hearth, and control means for disabling or reducing the heating of the hearth , the heating table having a timer for reactivating the heating when the detector detects the refitting of the container to the extent that the absence has not lasted beyond a specified period. The detection means may be of the weight-based type, the ultrasonic transceiver, the capacitive or inductive effect of the frequency variation of a high-frequency oscillating circuit, the fact of placing or depositing the cooking utensil influencing the frequency of oscillation which allows to detect or not the presence of the utensil. However, such detection means also do not allow to make a distinction on the type of object placed and are hardly feasible on barefire cooktops. A similar device is also described in EP 0429120 .

La présente invention a donc pour premier but de proposer un dispositif de détection de la présence d'un récipient sur une table de cuisson au niveau d'un brûleur qui permet une certaine reconnaissance du type d'objet posé sur la table de cuisson. L'invention a également pour but de proposer un dispositif d'allumage et d'extinction d'un brûleur à gaz sur une table de cuisson pourvue de brûleurs à gaz, le dispositif comportant un tel dispositif de détection de la présence d'un récipient sur un brûleur de gaz d'une table de cuisson de sorte à commander lors de la détection de la présence d'un récipient sur ledit brûleur, l'allumage du brûleur et lors de l'absence dudit récipient, l'extinction du brûleur.The present invention therefore has for first purpose to provide a device for detecting the presence of a container on a hob at a burner which allows some recognition of the type of object placed on the hob. The invention also aims to propose a device for igniting and extinguishing a gas burner on a hob provided with gas burners, the device comprising such a device for detecting the presence of a container. on a gas burner of a hob so as to control when detecting the presence of a container on said burner, the ignition of the burner and in the absence of said container, extinguishing the burner.

A cet effet, l'invention a pour objet un dispositif de détection de la présence d'un récipient sur une table de cuisson pourvue d'au moins un brûleur à gaz, caractérisé en ce que ledit dispositif est constitué d'un circuit électrique alimenté par une source en courant électrique à basse tension, dont l'une des bornes est reliée à la table de cuisson et plus précisément à la grille en matériau électriquement conducteur de la table de cuisson et l'autre borne est reliée à une électrode logée au niveau du brûleur, de sorte qu'en présence d'un récipient en matériau électriquement conducteur sur le brûleur, ledit récipient entre en contact avec la grille et avec l'électrode, la présence du récipient étant détectée par la fermeture du circuit électrique tandis que l'absence de récipient est détectée par l'ouverture du circuit électrique.For this purpose, the invention relates to a device for detecting the presence of a container on a hob provided with at least one gas burner, characterized in that said device consists of an electric circuit powered by a source of low voltage electrical current, one of whose terminals is connected to the hob and more precisely to the grid of electrically conductive material of the hob and the other terminal is connected to an electrode housed in the burner level, so that in the presence of a container of electrically conductive material on the burner, said container comes into contact with the grid and with the electrode, the presence of the container being detected by closing the electrical circuit while the absence of a container is detected by the opening of the electric circuit.

Ainsi de manière simple par l'ouverture et la fermeture du circuit électrique, il est possible de détecter la présence ou non d'un récipient de cuisson. De cette manière, la pose d'un objet qui ne serait pas un récipient de cuisson électriquement conducteur ne peut être détectée. On propose ainsi un dispositif de détection « électrique » spécifique permettant d'éviter un allumage du brûleur à gaz lorsque l'objet posé sur la table de cuisson ne ferme pas le circuit électrique, évitant ainsi des nombreux accidents.Thus in a simple way by the opening and closing of the electric circuit, it is possible to detect the presence or absence of a cooking vessel. In this way, the laying of an object that would not be an electrically conductive cooking vessel can not be detected. It is thus proposed a specific "electrical" detection device to prevent ignition of the gas burner when the object placed on the hob does not close the electrical circuit, thus avoiding many accidents.

La présente invention a donc également pour objet un dispositif d'allumage et d'extinction automatique d'un brûleur à gaz sur une table de cuisson pourvue d'au moins une brûleur à ledit brûleur comportant une veilleuse, un thermocouple et une conduite alimentant en gaz ledit brûleur, contrôlé par une électrovanne, caractérisé en ce qu'il comprend ; des moyens de détection de la présence d'un récipient au niveau du brûleur sur la table de cuisson, constitués du dispositif de détection constitué d'un circuit électrique alimenté par une source en courant électrique à basse tension, dont l'une des bornes est reliée à la table de cuisson et plus précisément à la grille en matériau électriquement conducteur de la table de cuisson et l'autre borne est reliée à une électrode logée au niveau du brûleur, de sorte qu'en présence d'un récipient en matériau électriquement conducteur posé au niveau du brûleur, ledit récipient entre en contact, avec la grille et avec l'électrode, la présence du récipient étant détectée par la fermeture du circuit électrique tandis que l'absence de récipient est détectée par l'ouverture du circuit électrique, et des moyens de gestion et de traitement du signal de détection résultant de l'ouverture et de la fermeture du circuit électrique du dispositif de détection pour commander l'ouverture de l'électrovanne prévue sur la conduite du brûleur lorsque la présence d'un récipient est détectée et la fermeture de ladite électrovanne lorsque l'absence d'un récipient est détectée.The present invention therefore also relates to an automatic ignition and extinguishing device of a gas burner on a hob provided with at least one burner to said burner having a pilot, a thermocouple and a pipe supplying gas. said gas burner, controlled by a solenoid valve, characterized in that it comprises; means for detecting the presence of a container at the burner on the hob, consisting of the detection device consisting of an electric circuit powered by a low-voltage electrical source, one of whose terminals is connected to the hob and more precisely to the grid of electrically conductive material of the hob and the other terminal is connected to an electrode housed at the burner, so that in the presence of a container of electrically material conductor placed at the burner, said container comes into contact with the gate and with the electrode, the presence of the container being detected by closing the electrical circuit while the absence of the container is detected by the opening of the electrical circuit , and means for managing and processing the detection signal resulting from the opening and closing of the electrical circuit of the detection device for r control the opening of the solenoid valve provided on the burner pipe when the presence of a container is detected and the closing of said solenoid valve when the absence of a container is detected.

De préférence, la source en courant alternatif à basse tension (par exemple 12V) et ainsi que les moyens de gestion et de traitement sont constitués de composants électroniques classiques en soi, regroupés sur une carte électronique reliée à une alimentation secteur. On peut également prévoir un amplificateur de courant pour faciliter la détection même en cas de mauvais contact du récipient avec l'électrode et/ou la grille et des moyens de temporisation qui commandent une extinction retardée du brûleur par rapport à la détection de l'absence de récipient sur le brûleur.Preferably, the low voltage alternating current source (for example 12V) and the management and processing means consist of conventional electronic components per se, grouped together on an electronic board connected to a mains power supply. It is also possible to provide a current amplifier to facilitate the detection itself in case of poor contact of the container with the electrode and / or the gate and timing means which control a delayed extinction of the burner with respect to the detection of the absence of a container on the burner.

Selon une forme de réalisation de l'invention, l'électrode est montée dans un alésage traversant le corps du brûleur et le chapeau de brûleur et est montée en saillie du chapeau de préférence de manière à venir sensiblement dans le plan de la grille de la table de cuisson de sorte à entrer en contact avec un récipient posé sur la table de cuisson au niveau du brûleur.According to one embodiment of the invention, the electrode is mounted in a bore passing through the burner body and the burner cap and is projected from the cap preferably so as to come substantially in the plane of the grid of the cooktop so as to come into contact with a container placed on the cooktop at the burner.

Ainsi, de manière même pour un récipient de petit diamètre, lorsque celui-ci est mis en regard du brûleur, le contact électrique est assuré fermant le circuit électrique assurant la détection du récipient.Thus, even for a small diameter container, when it is facing the burner, the electrical contact is ensured closing the electrical circuit ensuring the detection of the container.

Selon une forme de réalisation préférée de l'invention, l'électrode porte à son extrémité un palpeur électriquement conducteur constitué d'un corps de palpeur et d'un organe de détection monté entraînable en déplacement sur ledit corps de palpeur entre une position dite de non détection dans laquelle ledit organe est maintenu en saillie par rapport à la grille de la table de cuisson et une position dite de détection dans laquelle ledit organe est entraîné en déplacement de manière à s'effacer sous un récipient De cette manière, même si le récipient est pourvu d'un fond non plat, lorsqu'il est mis en place sur le brûleur en question, l'organe de détection maintenu en saillie permet d'assurer le contact pour fermer le circuit et ainsi permettre la détection du récipient.According to a preferred embodiment of the invention, the electrode carries at its end an electrically conductive probe consisting of a probe body and a detection member mounted displaceable on said probe body between a position called non-detection in which said member is kept protruding from the grid of the hob and a so-called detection position in which said member is driven in displacement so as to disappear under a container In this way, even if the container is provided with a non-flat bottom, when it is placed on the burner in question, the sensing member held projecting ensures contact to close the circuit and thus allow detection of the container.

De préférence, ledit organe de détection est un levier monté pivotant sur le corps de palpeur autour d'un axe sur le corps du palpeur dans un plan s'étendant perpendiculairement à la table de cuisson, de sorte que le levier présentant une extrémité pourvue d'un lest, cette extrémité lestée maintient l'extrémité opposée en saillie au-dessus de la grille de la table de cuisson tout en permettant le pivotement dudit levier lorsqu'un récipient posé au niveau du brûleur repousse ladite extrémité en saillie et assure le contact avec l'électrode par l'intermédiaire dudit levier et du corps de palpeur. Dès que le récipient est retiré, l'extrémité lestée entraîne en pivotement l'extrémité opposée de manière à la ramener en saillie.Preferably, said detecting member is a lever pivotally mounted on the probe body about an axis on the body of the probe in a plane extending perpendicular to the hob, so that the lever having an end provided with 1 ballast, this weighted end maintains the opposite end protruding above the grid of the hob while allowing the pivoting of said lever when a container placed at the burner pushes said projecting end and ensures contact with the electrode via said lever and the probe body. As soon as the container is removed, the weighted end pivots the opposite end so as to bring it back.

Un tel montage à pivotement sur un levier pourvu d'une extrémité lestée évite d'avoir à utiliser des moyens de rappel de l'organe de détection en position tels que des ressorts. On offre donc ainsi un palpeur dont le fonctionnement est garanti et fiable même au sein du brûleur et ce malgré, les hautes températures qui y règnent.Such pivotal mounting on a lever provided with a weighted end avoids having to use the detent means of the detecting member in position such as springs. So we offer a probe whose operation is guaranteed and reliable even within the burner and despite the high temperatures that prevail.

Lors de l'utilisation d'une table de cuisson, il est fréquent également que les récipients remplis d'aliments à cuire soient lourds et difficile à manier. Aussi, il est courant de déplacer les récipients simplement en les poussant sur la table de cuisson, pour les retirer du feu ou les y remettre.When using a hob, it is also common for the containers filled with food to be heavy and difficult to handle. Also, it is common to move the containers simply by pushing them on the hob, to remove them from the fire or put them back there.

Selon une forme réalisation préférée, le corps de palpeur est également monté entraînable en rotation autour de l'électrode. De cette manière, lorsqu'on déplace par simple coulissement un récipient, le levier en saillie entre en butée contre le récipient qui le pousse ce qui entraîne la rotation du corps du palpeur sur l'électrode. Cette rotation du palpeur permet avantageusement un effacement dudit levier sous le récipient risque d'arrachement de celui-ci,According to a preferred embodiment, the probe body is also rotatably mounted around the electrode. In this way, when a container is moved by simple sliding, the projecting lever abuts against the container that pushes it, which causes the body of the probe to rotate on the electrode. This rotation of the probe advantageously allows an erasure of said lever under the container risk of tearing it,

L'invention a également pour objet une table de cuisson du type à feux nus, destinée plus particulièrement à la restauration professionnelle mais non exclusivement, pourvue d'au moins un brûleur à gaz et comportant un dispositif d'allumage d'extinction automatique dudit brûleur selon l'invention.The invention also relates to a hob of the fireside type, intended more particularly for professional catering but not exclusively, provided with at least one gas burner and having an ignition device for automatically extinguishing said burner according to the invention.

On décrira maintenant l'invention, plus en détails en référence au dessin dans lequel la figure 1 représente une vue schématique d'une table de cuisson pourvue d'un dispositif d'allumage et d'extinction de brûleur selon l'invention ;The invention will now be described in greater detail with reference to the drawing in which the figure 1 is a schematic view of a hob provided with a burner ignition and extinguishing device according to the invention;

La figure 2 représente une vue en coupe longitudinale d'un palpeur du dispositif de détection selon l'invention.The figure 2 represents a longitudinal sectional view of a probe of the detection device according to the invention.

Le dispositif de détection de la présence d'un récipient 11 de cuisson classiquement en matériau électriquement conducteur tel que de l'inox, de l'aluminium, du cuivre sur une table de cuisson selon l'invention est destiné à équiper une table de cuisson T pourvue d'au moins un brûleur à gaz 1. Une table de cuisson est généralement elle-même constituée de matériaux électriquement conducteurs.The device for detecting the presence of a cooking container 11 conventionally made of electrically conductive material such as stainless steel, aluminum, copper on a hob according to the invention is intended to equip a hob T provided of at least one gas burner 1. A hob is generally itself made of electrically conductive materials.

Le brûleur 1 est alimenté par une conduite d'alimentation en gaz G dont l'ouverture et la fermeture est commandée par un robinet 3 de manipulation classique en soi. Une fois l'alimentation en gaz ouverte, le gaz est guidé vers une veilleuse 4 et un thermocouple, de manière classique en soi. Une fois, le thermocouple chauffé, le gaz peut être guidé vers le brûleur 1 pair l'intermédiaire d'une conduite 2 contrôlée par une électrovanne 5.The burner 1 is fed by a gas supply pipe G whose opening and closing is controlled by a valve 3 of conventional handling per se. Once the gas supply is open, the gas is guided to a pilot 4 and a thermocouple, in a conventional manner per se. Once the thermocouple has been heated, the gas can be guided to the burner 1 via a pipe 2 controlled by a solenoid valve 5.

Le dispositif de détection de la présence d'un récipient est constitué d'un circuit électrique alimenté par une source en courant électrique à basse tension, dont l'une des bornes est reliée par un fil conducteur f1 à la masse m de la table de cuisson. T et donc à la grille 6 en matériau électriquement conducteur de la table de cuisson T et l'autre borne est reliée par un second fil conducteur f2 à une électrode 7 logée au niveau du brûleur 1.The device for detecting the presence of a container consists of an electric circuit powered by a low-voltage electrical power source, one of whose terminals is connected by a conducting wire f1 to the ground m of the table of cooking. T and therefore to the grid 6 of electrically conductive material of the hob T and the other terminal is connected by a second lead f2 to an electrode 7 housed at the burner 1.

Ainsi, le circuit électrique constitué de la source en courant alternatif à basse tension, de la grille 6 et l'électrode 7 est ouvert. Pour fermer ce circuit, il convient de relier électriquement la grille 6 à l'électrode 7. Aussi, lorsqu'on met en place au niveau du brûleur 1, un récipient de cuisson 11 généralement constitué d'un matériau électriquement conducteur et que celui-ci repose d'une part sur la grille 6 et entre en contact par son fond avec l'électrode 7, on ferme le circuit électrique. La fermeture du circuit électrique donne donc comme information la présence d'un récipient de cuisson 11. Par ailleurs, cette détection ne peut se faire qu'en présence d'un objet fermant le circuit électrique. Par conséquent, la pose de la main sur le brûleur ou d'un objet non électriquement conducteur ne conduit pas à la fermeture du circuit électrique et donc n'est pas détectée.Thus, the electric circuit consisting of the low-voltage alternating current source, the gate 6 and the electrode 7 is open. To close this circuit, it is necessary to electrically connect the gate 6 to the electrode 7. Also, when placing at the burner 1, a cooking vessel 11 generally made of an electrically conductive material and that it- it rests on the one hand on the gate 6 and comes into contact with its bottom with the electrode 7, the electrical circuit is closed. Closing the electric circuit thus gives as information the presence of a cooking vessel 11. Moreover, this detection can be done only in the presence of an object closing the electrical circuit. Therefore, placing the hand on the burner or non-electrically conductive object does not lead to closing the electrical circuit and therefore is not detected.

En présence d'un récipient 11 en matériau électriquement conducteur sur le brûleur 1, ledit récipient 1 entre en contact avec la grille 6 et avec l'électrode 7, la présence du récipient 11 étant détectée par la fermeture du circuit électrique tandis que l'absence de récipient est détectée par couverture du circuit électrique.In the presence of a container 11 of electrically conductive material on the burner 1, said container 1 comes into contact with the gate 6 and with the electrode 7, the presence of the container 11 being detected by closing the electrical circuit while the No container is detected by covering the electrical circuit.

Le dispositif de détection ainsi décrit est intégré dans un dispositif d'allumage et d'extinction automatique d'un brûleur à gaz qui comporte en outre des moyens de gestion et de traitement du signal résultant de détection (la fermeture ou de l'ouverture du circuit électrique) pour commander l'ouverture de l'électrovanne 5 lorsque la présence du récipient 11 est détectée et la fermeture de ladite électrovanne 5 lorsque l'absence du récipient 11 est détectée.The detection device thus described is integrated in an automatic ignition and extinguishing device of a gas burner which furthermore comprises means for managing and processing the signal resulting from detection (the closing or opening of the electrical circuit) for controlling the opening of the solenoid valve 5 when the presence of the container 11 is detected and the closing of said solenoid valve 5 when the absence of the container 11 is detected.

De préférence, la source en courant alternatif à basse tension ainsi que les moyens de gestion et de traitement du signal correspondant à la détection sont constitués de composants électroniques classiques en soi, regroupés sur une carte électronique C reliée à une alimentation section A. On peut également prévoir sur la carte électronique, un amplificateur de courant. De cette manière, même si le contact permettant la fermeture du circuit est mauvais par exemple, l'amplificateur permet un signal de détection pouvant être traité.Preferably, the low-voltage alternating current source as well as the signal management and processing means corresponding to the detection consist of conventional electronic components per se, grouped together on an electronic card C connected to a section A power supply. also provide on the electronic card, a current amplifier. In this way, even if the contact allowing the closing of the circuit is bad for example, the amplifier allows a detection signal that can be processed.

Selon une forme de réalisation, le circuit électrique peut être directement le circuit alimentant l'électrovanne 5, par exemple si l'électrovanne 5 fonctionne en basse tension. Ainsi, la fermeture et l'ouverture du circuit de détection commande directement l'électrovanne.According to one embodiment, the electrical circuit can be directly the circuit supplying the solenoid valve 5, for example if the solenoid valve 5 operates at low voltage. Thus, the closing and opening of the detection circuit directly controls the solenoid valve.

Ainsi, lorsque le circuit électrique est fermé par la présence d'un récipient 11, cette fermeture du circuit électrique constitue un signal que les moyens de gestion et de traitement traitent pour déclencher des moyens de commande de l'ouverture de l'électrovanne 5 de manière à laisser passer le gaz jusqu'au chapeau 1a du brûleur 1 qui s'enflamme en présence de la veilleuse 4. Si on retire le récipient 11, le circuit s'ouvre et l'ouverture du circuit constitue un signal qui, traité, permet de déclencher les moyens de commande pour la fermeture de l'électrovanne 5 de manière à éteindre le brûleur 1.Thus, when the electric circuit is closed by the presence of a container 11, this closure of the electrical circuit constitutes a signal that the management and processing means process to trigger control means for the opening of the solenoid valve 5 of in order to allow the gas to pass to the hat 1a of the burner 1 which ignites in the presence of the pilot light 4. If the container 11 is removed, the circuit opens and the opening of the circuit constitutes a signal which, treated, allows to trigger the control means for closing the solenoid valve 5 so as to extinguish the burner 1.

De préférence, on prévoit également des moyens de temporisation qui, lorsque l'absence du récipient 11 est détectée par l'ouverture du circuit, permettent de retarder l'extinction, du brûleur 1 par rapport à la détection de l'absence de récipient 11 sur le brûleur 1. Cette temporisation permet de ne provoquer l'extinction, du brûleur 1 qu'après une durée déterminée, pouvant être préalablement déterminée comme étant une absence du récipient 11 correspondant à un retrait total du récipient hors du feu.Preferably, provision is also made for delaying means which, when the absence of the container 11 is detected by the opening of the circuit, make it possible to delay the extinguishing of the burner 1 with respect to the detection of the absence of a container 11 on the burner 1. This time delay makes it possible to extinguish the burner 1 after a fixed period, which may be previously determined as being an absence of the container 11 corresponding to a total withdrawal of the container from the fire.

De préférence, l'électrode 7 est montée à l'intérieur d'une gaine isolante 7a dans un alésage traversant le corps 1b du brûleur 1 et le chapeau la de brûleur et est montée en saillie dudit chapeau la de manière à venir sensiblement sous le plan de la grille 6 de la table de cuisson T.Preferably, the electrode 7 is mounted inside an insulating sheath 7a in a bore passing through the body 1b of the burner 1 and the burner cap 1a and is projecting from said cap 1b so as to come substantially under the Grid 6 plan of the T cooktop.

Cette électrode 7 porte à son extrémité dans l'exemple représente un palpeur 8 comportant un corps de palpeur 9 de forme sensiblement conique pourvu d'un orifice dans lequel se loge l'extrémité de l'électrode 7 et un organe de détection 10. Le courant alternatif de faible tension produit depuis la carte électronique passe donc par l'électrode 7, le palpeur 8 avec le retour par la masse m de la table de cuisson T, le récipient 11 fermant le circuit au contact du palpeur 8 et de la grille 6 de la table de cuisson (sur la figure 1, on peut voir que le récipient 11 est légèrement au-dessus de la grille 6 pour des raisons de clarté du dessin).This electrode 7 carries at its end in the example represents a probe 8 comprising a probe body 9 of substantially conical shape provided with an orifice in which is housed the end of the electrode 7 and a detection member 10. The low voltage alternating current produced from the electronic card therefore passes through the electrode 7, the probe 8 with the return by the mass m of the hob T, the container 11 closing the circuit in contact with the probe 8 and the gate 6 of the hob (on the figure 1 it can be seen that the container 11 is slightly above the grid 6 for the sake of clarity of the drawing).

Cet organe de détection 10 est monté pivotant autour d'un axe x s'étendant parallèlement à la table de cuisson T, sur ledit corps de palpeur 9 entre une position dite de non détection dans laquelle ledit organe 10 est maintenu en saillie par rapport à la grille 6 (cf la figure 2) et une position dite de détection dans laquelle ledit organe 10 est entraîné en pivotement de manière à s'effacer sous un récipient 11 posé sur la grille 6 au niveau du brûleur 1.This detection member 10 is pivotally mounted about an axis x extending parallel to the cooking table T, on said probe body 9 between a so-called non-detection position in which said member 10 is kept projecting relative to the grid 6 (see the figure 2 ) and a so-called detection position in which said member 10 is pivotally driven so as to fade under a container 11 placed on the gate 6 at the level of the burner 1.

Cet organe de détection est un levier 10 présentant une extrémité 10a pourvue d'un lest et monté pivotant sur le corps du palpeur 9 dans un plan s'étendant perpendiculairement à la table de cuisson T, de sorte que l'extrémité lestée 10a maintient l'extrémité opposée 10b plus légère, par exemple évidée, en saillie au-dessus de la grille 6 de la table de cuisson T tout en permettant le pivotement dudit levier 10 lorsqu'un récipient 11 posé sur la grille 6 au niveau du brûleur 1 repousse ladite extrémité en saillie 10b et assure le contact entre la grille 6 et l'électrode 7 par l'intermédiaire dudit levier 10 et du corps de palpeur 9. Dès que le récipient 11 est retiré, l'extrémité lestée 10a entraîne en pivotement l'extrémité opposée 10b de manière à la remettre en saillie au-dessus de la grille 6.This detection member is a lever 10 having an end 10a provided with a ballast and pivotally mounted on the body of the probe 9 in a plane extending perpendicularly to the hob T, so that the weighted end 10a maintains the opposite end 10b lighter, for example recessed, projecting above the grid 6 of the hob T while allowing the pivoting of said lever 10 when a container 11 placed on the gate 6 at the burner 1 regrows said projecting end 10b and ensures the contact between the gate 6 and the electrode 7 via said lever 10 and the probe body 9. As soon as the container 11 is removed, the weighted end 10a drives into position. pivoting the opposite end 10b so as to project it above the grid 6.

Le corps de palpeur 9 est en outre monté entraînable en rotation autour de l'électrode 7, autour d'un axe y. De cette manière, lorsqu'on déplace par simple coulissement un récipient 11, le levier en saillie 10b entre en butée contre le récipient 11 et entraîne la rotation du corps du palpeur 9 sur l'électrode 7. Cette rotation du palpeur 8 permet un effacement dudit levier 10 sous le récipient 11 sans risque d'arrachement dudit levier 10. Cette extrémité 10b présente de préférence une forme arrondie pour faciliter l'effacement sous le récipient 11.The probe body 9 is further mounted drivable in rotation around the electrode 7, about an axis y. In this way, when a container 11 is moved by simple sliding, the projecting lever 10b abuts against the container 11 and causes the body of the feeler 9 to rotate on the electrode 7. This rotation of the probe 8 allows an erasure said lever 10 under the container 11 without risk of tearing said lever 10. This end 10b preferably has a rounded shape to facilitate erasure under the container 11.

Ainsi, le palpeur 8 est l'électrode 7 sont montés au centre du brûleur 1 et sont donc soumis à des températures très hautes en fonctionnement mais permettant une détection de petits récipients. Le levier de détection 10 n'ayant pas besoin de ressort pour être ramené en position de non détection, il est donc logeable au centre du brûleur 1 sans que les températures très hautes de fonctionnement ne perturbent son fonctionnement.Thus, the probe 8 is the electrode 7 are mounted in the center of the burner 1 and are therefore subjected to very high temperatures in operation but allowing detection of small containers. The detection lever 10 does not need a spring to be returned to the non-detection position, so it is houseable in the center of the burner 1 without the very high operating temperatures do not interfere with its operation.

On peut prévoir une carte électronique pour chaque brûleur 1 ou bien on peut prévoir une carte électronique sur laquelle l'ensemble des brûleurs est géré.An electronic card may be provided for each burner 1 or an electronic card may be provided on which all the burners are managed.

De préférence, on prévoit que la grille 6, le palpeur 8, le chapeau 1a du brûleur, le corps du brûleur 1b et la cuvette de propreté 12 de la table de cuisson T sont démontables pour être nettoyés.Preferably, it is expected that the grid 6, the probe 8, the hat 1a of the burner, the body of the burner 1b and the bowl of cleanliness 12 of the hob T are removable for cleaning.

L'invention n'est bien entendu nullement limitée aux exemples décrits donnés à titre d'illustration mais englobe toutes les variantes entrant dans le champ de la définition de l'invention.The invention is of course in no way limited to the examples described given by way of illustration but encompasses all the variants falling within the scope of the definition of the invention.

Claims (12)

Dispositif de détection de la présence d'un récipient (11) sur une table de cuisson (T) pourvue d'au moins un brûleur à gaz (1),
caractérisé en ce que ledit dispositif est constitué d'un circuit électrique alimenté par une source en courant électrique à basse tension, dont l'une des bornes est reliée à la table de cuisson et plus précisément à la grille (6) en matériau électriquement conducteur de la table de cuisson et l'autre borne est reliée à une électrode (7) logée au niveau du brûleur (1), de sorte qu'en présence d'un récipient (11) en matériau électriquement conducteur sur le brûleur (1), ledit récipient (11) entre en contact avec la grille (6) et avec l'électrode (7), la présence du récipient (11) étant détectée par La fermeture du circuit électrique tandis que l'absence de récipient (11) est détectée par l'ouverture du circuit électrique.Device for detecting the presence of a container (11) on a hob (T) provided with at least one gas burner (1),
characterized in that said device consists of an electric circuit powered by a low-voltage electrical current source, one of whose terminals is connected to the hob and more specifically to the grid (6) of electrically conductive material of the hob and the other terminal is connected to an electrode (7) housed at the burner (1), so that in the presence of a container (11) of electrically conductive material on the burner (1) , said container (11) comes into contact with the grid (6) and with the electrode (7), the presence of the container (11) being detected by closing the electrical circuit while the absence of container (11) is detected by the opening of the electrical circuit. Dispositif de détection selon la revendication 1,
caractérisé en ce que l'électrode (7) est montée dans un alésage traversant le corps du brûleur (1b) et le chapeau de brûleur (1a) et est montée en saillie du chapeau (1a) de sorte à entrer en contact avec un récipient (11) posé sur la table de cuisson (T) au niveau du brûleur (1).Detection device according to claim 1,
characterized in that the electrode (7) is mounted in a bore passing through the burner body (1b) and the burner cap (1a) and is mounted to project from the cap (1a) so as to contact a container (11) placed on the hob (T) at the burner (1). Dispositif de détection selon la revendication 2,
caractérisé en ce que l'électrode (7) porte en outre à son extrémité un palpeur (8) électriquement conducteur constitué d'un corps de palpeur (9) d'un organe de détection (10) monté entraînable en déplacement sur ledit corps de palpeur (9) entre une position dite de non détection dans laquelle ledit organe (10) est maintenu en saillie par rapport à la grille (6) de la table de cuisson (T) et une position dite de détection dans laquelle ledit organe (10) est entraîné en déplacement de manière à s'effacer sous un récipient (11) posé au niveau du brûleur sur la grille (6).Detection device according to claim 2,
characterized in that the electrode (7) further carries at its end an electrically conductive probe (8) consisting of a feeler body (9) of a detecting member (10) mounted displaceably movable on said body. probe (9) between a so-called non-detection position in which said member (10) is kept protruding from the grid (6) of the hob (T) and a so-called detection position in which said member (10) ) is driven in displacement so as to fade under a container (11) placed at the burner on the grid (6). Dispositif de détection selon la revendication 3,
caractérisé en ce que ledit organe de détection est un levier (10) monté pivotant autour d'un axe (x) sur le corps du palpeur (9) dans un plan s'étendant perpendiculairement à la table de cuisson (T), et présentant une extrémité (10a) pourvue d'un lest de sorte que cette extrémité lestée (10a) maintient l'extrémité opposée (10b) en saillie au-dessus de la grille (6) de la table de cuisson (T) tout en permettant le pivotement dudit levier (10) pour repousser ladite extrémité (10b) en saillie sous l'effet de la dépose d'un récipient (11).Detection device according to claim 3,
characterized in that said sensing member is a lever (10) pivotally mounted about an axis (x) on the body of the feeler (9) in a plane extending perpendicularly to the hob (T), and having an end (10a) provided with a ballast so that this weighted end (10a) holds the opposite end (10b) protruding above the grill (6) of the hob (T) while allowing the pivoting of said lever (10) to push back said end (10b) protruding under the effect of the removal of a container (11). Dispositif de détection selon l'une des revendications 3 et 4,
caractérisé en ce que le corps de palpeur (9) est monté entraînable en rotation autour de l'électrode (7).Detection device according to one of claims 3 and 4,
characterized in that the probe body (9) is mounted rotatable about the electrode (7). Dispositif d'allumage et distinction automatique d'un brûleur à gaz (1) sur une table de cuisson (T) pourvue d'au moins un brûleur à gaz (1), ledit brûleur (1) comportant une veilleuse (4), un thermocouple et une conduite (2) alimentant en gaz ledit brûleur (1), contrôlée par une électrovanne (5), caractérisé en ce qu'il comprend : des moyens de détection de la présence d'un récipient (11) au niveau du brûleur (1) sur la table de cuisson (T), constitués par le dispositif selon l'une des revendications 1 à 5, des moyens de gestion et de traitement du signal de détection pour commander l'ouverture de l'électrovanne (5) prévue sur la conduite (2) du brûleur (1) lorsque la présence d'un récipient (11) est détectée et la fermeture de ladite électrovanne (5) lorsque l'absence d'un récipient (11) est détectée. Ignition device and automatic distinction of a gas burner (1) on a hob (T) provided with at least one gas burner (1), said burner (1) having a pilot light (4), a thermocouple and a pipe (2) supplying gas to said burner (1), controlled by a solenoid valve (5), characterized in that it comprises: means for detecting the presence of a container (11) at the burner (1) on the hob (T), constituted by the device according to one of claims 1 to 5, means for managing and processing the detection signal for controlling the opening of the solenoid valve (5) provided on the pipe (2) of the burner (1) when the presence of a container (11) is detected and the closure said solenoid valve (5) when the absence of a container (11) is detected. Dispositif d'allumage et d'extinction selon la revendication 6,
caractérisé en ce que la source en courant alternatif à basse tension ainsi que les moyens de gestion et de traitement sont regroupés sur une carte électronique reliée à une alimentation secteur (A).Ignition and extinguishing device according to claim 6,
characterized in that the low-voltage alternating current source and the management and processing means are grouped together on an electronic card connected to a mains power supply (A). Dispositif d'allumage et d'extinction selon l'une des revendications 6 et 7,
caractérisé en ce qu'est prévu un amplificateur de courant.Ignition and extinguishing device according to one of claims 6 and 7,
characterized in that a current amplifier is provided. Dispositif d'allumage et d'extinction selon l'une des revendications 6 et 7,
caractérisé en ce que sont prévus des moyens de temporisation qui commandent une extinction retardée du brûleur (1) par rapport à la détection de l'absence de récipient (11) sur le brûleur (1).Ignition and extinguishing device according to one of claims 6 and 7,
characterized in that there are provided delay means which control a delayed extinguishing of the burner (1) with respect to the detection of the absence of container (11) on the burner (1). Dispositif d'allumage et d'extinction selon l'une des revendications 6 à 9,
caractérisé en ce qu'est prévue une carte électronique pour chaque brûleur (1).Ignition and extinguishing device according to one of Claims 6 to 9,
characterized in that an electronic card is provided for each burner (1). Dispositif d'allumage et d'extinction selon l'une des revendications 6 à 9,
caractérisé en ce qu'est prévue une carte électronique avec laquelle l'ensemble des brûleurs (1) est géré.Ignition and extinguishing device according to one of Claims 6 to 9,
characterized in that an electronic card is provided with which the set of burners (1) is managed. Table de cuisson pourvue d'au moins un brûleur,
caractérisé en ce qu'elle comporte un dispositif d'allumage et d'extinction automatique dudit brûleur selon l'une des revendications 6 à 11.Cooktop with at least one burner,
characterized in that it comprises an automatic ignition and extinguishing device of said burner according to one of claims 6 to 11.
EP20090175861 2008-11-14 2009-11-12 Device for the detection of a recipient's presence on a cooktop on the gas burner Not-in-force EP2187131B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0806400A FR2938631B1 (en) 2008-11-14 2008-11-14 DEVICE FOR DETECTING THE PRESENCE OF A CONTAINER ON A COOKTOP AT A GAS BURNER

Publications (2)

Publication Number Publication Date
EP2187131A1 true EP2187131A1 (en) 2010-05-19
EP2187131B1 EP2187131B1 (en) 2012-07-25

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EP20090175861 Not-in-force EP2187131B1 (en) 2008-11-14 2009-11-12 Device for the detection of a recipient's presence on a cooktop on the gas burner

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EP (1) EP2187131B1 (en)
FR (1) FR2938631B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015114495A1 (en) * 2014-02-03 2015-08-06 BSH Hausgeräte GmbH Gas shut-off valve, gas burner assembly, cooking hob, and stove

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11357080B2 (en) 2019-09-30 2022-06-07 Midea Group Co., Ltd. Cooking container sensing for ignition triggering and programmed cooking

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0429120A2 (en) * 1989-11-17 1991-05-29 Whirlpool Europe B.V. Device for detecting the presence of a food cooking container on a cooking hob
EP0731317A1 (en) * 1995-03-07 1996-09-11 Therma Grossküchen AG Gas cooker having a pan detection system
US20020175213A1 (en) * 2001-05-22 2002-11-28 Josef Wodeslavsky Energy-saving automatic flame control at a gas cooktop

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0429120A2 (en) * 1989-11-17 1991-05-29 Whirlpool Europe B.V. Device for detecting the presence of a food cooking container on a cooking hob
EP0731317A1 (en) * 1995-03-07 1996-09-11 Therma Grossküchen AG Gas cooker having a pan detection system
US20020175213A1 (en) * 2001-05-22 2002-11-28 Josef Wodeslavsky Energy-saving automatic flame control at a gas cooktop

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015114495A1 (en) * 2014-02-03 2015-08-06 BSH Hausgeräte GmbH Gas shut-off valve, gas burner assembly, cooking hob, and stove

Also Published As

Publication number Publication date
FR2938631A1 (en) 2010-05-21
EP2187131B1 (en) 2012-07-25
FR2938631B1 (en) 2010-12-24

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