EP1094276B1 - Control device for opening the safety valve of the gas flow of a burner - Google Patents

Control device for opening the safety valve of the gas flow of a burner Download PDF

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Publication number
EP1094276B1
EP1094276B1 EP00402919A EP00402919A EP1094276B1 EP 1094276 B1 EP1094276 B1 EP 1094276B1 EP 00402919 A EP00402919 A EP 00402919A EP 00402919 A EP00402919 A EP 00402919A EP 1094276 B1 EP1094276 B1 EP 1094276B1
Authority
EP
European Patent Office
Prior art keywords
tap
burner
outlet passage
winding
valve
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
EP00402919A
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German (de)
French (fr)
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EP1094276A1 (en
Inventor
Pascal Thomson-CSF Prop. Intellectuelle Oudart
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.)
Brandt Industries SAS
Original Assignee
Brandt Cooking SAC
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Publication date
Application filed by Brandt Cooking SAC filed Critical Brandt Cooking SAC
Publication of EP1094276A1 publication Critical patent/EP1094276A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/005—Regulating fuel supply using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/102—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/02—Controlling two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/08—Household apparatus

Definitions

  • the invention relates to an opening control device a gas flow control valve for a burner.
  • the invention applies especially in the field of household appliances with used gas burners domestic, used for example in gas ovens of stoves, or on the hobs, either independent or integrated into the stoves.
  • FIG. 1 shows a diagram of a tap.
  • the RBT tap notably includes a pipe 1 gas inlet, a gas outlet pipe 2 to the burner BRL corresponding to said tap, this duct having an outlet passage 21, whose diameter, fixed, determines the maximum gas flow in the burner.
  • the tap further comprises a movable part 3, called 'turning', by example in the shape of a cone with a slit with variable section, which is rotated in front of an orifice of fixed diameter, thus allowing adjust the gas flow.
  • the turn is driven mechanically by a joystick accessible to a user.
  • the valve also comprises an electromagnetic safety element, for example a solenoid valve 4, making it possible to close the outlet passage 21, in the case, for example, of an untimely extinction of the burner flame.
  • This solenoid valve for example, is formed of an electromagnet 41, driving a sealing pad 42, and connected to a flame detection system, for example a thermocouple TC located in the flame F of the burner. When the flame goes out, the current i tc delivered by the thermocouple in the electromagnet is no longer sufficient to maintain the sealing pad 42 and the latter closes the outlet passage 21.
  • the security element 4 is placed in a reception housing 5 of the tap, and the dimensions of these various parts are standard, varying little from one supplier to another.
  • the safety element When lighting the BRL burner, the safety element must be disengaged to allow the opening of the outlet passage 21. The disengagement is usually done by mechanical pressure of the user on the lever, causing a mechanism of pressing on the sealing pad 42, thus allowing the valve to open.
  • the flame detection system supplies the electromagnet with a current i tc which makes it possible to maintain the sealing pad, so that the passage 21 is kept open.
  • the invention provides an electronic control device for the opening of the tap which allows, according to an example of application, to control, in motorized rotary valves, the disengagement of the element of security.
  • the invention relates to a device for controlling the opening of at least one gas flow control valve of a burner, such as defined in claims 1 to 11.
  • the device according to the invention thus makes it possible to control electronically in burners with motorized rotary valves ignition of the burner by controlling the opening of the gas outlet passage in the tap. But it offers many other possibilities, such as management of certain functions such as simmer, timer, re-ignition, etc., both in manually operated ball valves and in those with motorized turning. It also has the advantage of using a solenoid valve of dimensions comparable to the electromagnetic safety elements of the prior art, which makes it possible not to change the structure of the taps or add additional electromagnetic elements to outside the tap.
  • FIG. 2 represents a diagram of an example of a device for control according to the invention. This is the order of at least one tap RBT for controlling the gas flow of a BRL burner.
  • the device according to the invention can be applied to the control of several valves each corresponding to a burner.
  • the burners are for example mounted on a hob, or independent, either integrated into a stove. It can also be gas oven burners, boiler burners, and generally type of gas burner whose gas flow control is ensured by a tap.
  • the tap notably comprises a conduit 1 gas inlet, a gas outlet pipe 2 to the burner BRL, said duct having an outlet passage 21 of predetermined fixed diameter and for example a turning point for controlling the gas flow rate (not shown).
  • the tap also includes a reception housing 5 allowing receive any electromagnetic safety element.
  • the control device comprises, for each valve, a solenoid valve 4 whose size allows it to stay in the accommodation unit 5.
  • the solenoid valve 4 includes in particular an electromagnet 41 and a sealing pad 42, of sufficient size to allow closing of the outlet passage 21.
  • the sealing disc is driven axially by the electromagnet.
  • the solenoid valve 4 includes in addition to a return spring for the patch 42 (not shown in FIG. 2), allowing the outlet passage 21 to be kept in the closed position when no force is applied by the electromagnet.
  • FIG. 3 An exemplary embodiment of a solenoid valve for a device according to the invention is shown schematically in Figure 3.
  • This is in this example of a solenoid valve comprising an electromagnet 41 called 'U-shaped'.
  • the electromagnet has a single coil 43, distributed over the two branches of the U, with the total number of turns given and a frame 44, the sealing pad 42 being connected by a pin 45 to said frame.
  • FIG. 3 also shows the spring of recall (noted 46) of the sealing pad 42, allowing to maintain in closed position outlet passage 21 when no force is applied to the armature by the electromagnet. Spring 46 presses on the pad seal 42 and on the structure of the electromagnet placed around the winding.
  • the device further comprises means control electronics (noted 6 in Figure 2) of the solenoid valve each tap.
  • control electronics noted 6 in Figure 2 of the solenoid valve each tap.
  • These means make it possible to supply, in the winding, each solenoid valve has a given peak current.
  • This peak current, as well that the number of turns in the winding are dimensioned so that the product of the peak current with the number of turns (given in Amps) is sufficient for the electromotive force applied allows the displacement of the sealing pad 42 and the opening of outlet passage 21.
  • control means will be described in more detail detail below.
  • the user can have access to all or part of the functionality of these control means, allowing it by example of electronically controlling the ignition of a burner.
  • the solenoid valve of the control device is dimensioned in a specific way.
  • the spring return force is typically of the order of Newton for an outlet passage 21 with a diameter of about 6 mm.
  • the spring is sized to meet safety standards on the gas network.
  • the electromotive force applied to the electromagnet must be sufficient to overcome the return force of the spring.
  • the product of number of turns per peak current should be around a thousand Ampere-towers, a value significantly higher than that necessary for the simple support of the frame.
  • the number of turns of the winding is for example around a thousand. This number is largely greater than the number of turns conventionally encountered in an element of safety also having a U-shaped electromagnet (indeed, in this type electromagnet, the number of turns is about ten on each coil).
  • the applicant proposes in this example, a single winding whose section of wire has a diameter significantly less than a tenth of a millimeter, which is substantially a order of magnitude lower than what is done in a security element classic.
  • the control means 6 (see FIG. 2) comprise means 61 for controlling the quantity of energy delivered in the winding of each solenoid valve when the peak current is supplied. Indeed, the section of the wire being reduced, the resistivity is very high and safety means must be put in place to limit the power dissipated in the winding as a function of time.
  • FIG. 4 illustrates an exemplary embodiment of the control means illustrating these control means. They are for example formed by a capacitor C in which is accumulated the energy necessary for the displacement of the sealing pad of a solenoid valve. The charging circuit of the capacitor C is formed in the example of FIG.
  • switch is meant any type of switch, mechanical or electrical (switch formed by a transistor).
  • the switch CT 1 closes briefly (for a duration approximately equal to three times the product of the value of R 2 by that of the capacitance of the capacitor, ie typically 1 second) to accelerate the charging of the capacitor C, for example of 0 at 50 V, then R 1 maintains this charge. This operation is done automatically, for example when the hob or oven is switched on, or after a first burner has been ignited.
  • the capacitor is recharged immediately and ready to discharge again in the winding of a solenoid valve.
  • the control means furthermore comprise, according to this example, and for each burner, means 62 for transferring the energy accumulated in the capacitor to the winding 43 of the solenoid valve of the burner tap, to move the disc of sealing of the solenoid valve and allow the opening of the outlet passage of said valve.
  • the transfer means are provided by means of a switch CT 2 .
  • the capacitor C in fact discharges into the winding 43 of the solenoid valve via the switch CT 2 , generating a current i b in the winding.
  • the switch CT 2 is for example controlled by the user when he wants to light the corresponding burner.
  • the electronic control means furthermore comprise, for each solenoid valve, means for supplying 63 of a holding current in the winding of the solenoid valve, making it possible to maintain the sealing pad so as to keep the outlet passage open. 21 from the corresponding tap.
  • the means for supplying the holding current are produced by an energy source U 1 connected to the terminals of the coil via a resistor R 3 in series with a third switch CT 3 .
  • the CT switch 3 closes for example substantially at the same time as the CT switch 2 , making it possible to immediately provide the holding current.
  • the CT switch 2 opens (and the capacitor can be charged again) while the CT switch 3 remains closed.
  • the opening of the switch CT 3 can for example be controlled by the user when he wants to close the burner.
  • the electronic control means also comprise electronic measurement 64 of a signal emitted by a flame detection system, for example a thermocouple TC placed in the flame F of each burners.
  • the measured signal is sent, for example, to the means 63 for supplying the holding current of the tap corresponding to the burner, allowing, in the event of an untimely extinction of the flame, stopping the supply of the holding current and closing the tap outlet passage.
  • the measured signal allows the opening of the switch CT 3 , in the example of FIG. 4.
  • control means 6 comprise a sequential management of the different switches, for example by means a state machine, or a microcontroller with a program sequencing. The user then acts on these control means by triggering a sequence.
  • FIG. 5 illustrates by a timing diagram giving the current i b in the winding as a function of time t, an example of operation of the device according to the invention incorporating control means of the type of those described in FIG. 4.
  • CT 1 closed briefly, allowing the capacitor to be charged.
  • the user decides to light a burner, and orders the closing of the switch CT 2 .
  • the capacitor discharges into the winding 43, causing a peak current i p in the winding, which allows the displacement of the armature of the corresponding valve, and the opening of the outlet passage.
  • CT 3 also closes, ensuring in the winding a holding current i m .
  • the user decides to extinguish the burner, and orders the opening of the switch CT 3 .
  • the operation can be repeated on each of the burners.
  • the control device opens up multiple possibilities of applications.
  • it allows re-ignition, sequential simmer, timer, etc.
  • re-ignition for example, if we take the example of embodiment of the control means of Figure 4, a detection of absence of flame on a burner can cause the closure of CT 2 and CT 3 , so discharge the capacitor in the winding to re-light the burner and keep it lit thanks to the holding current.
  • sequential simmering the closing and opening of switches CT 2 and CT 3 can be controlled sequentially to ensure sequential ignition of the burner and allow simmering.

Description

L'invention concerne un dispositif de commande de l'ouverture d'un robinet de contrôle du débit de gaz d'un brûleur. L'invention s'applique notamment dans le domaine de l'électroménager aux brûleurs à gaz d'usage domestique, utilisés par exemple dans les fours gaz des cuisinières, ou sur les tables de cuisson, soit indépendantes, soit intégrées dans les cuisinières.The invention relates to an opening control device a gas flow control valve for a burner. The invention applies especially in the field of household appliances with used gas burners domestic, used for example in gas ovens of stoves, or on the hobs, either independent or integrated into the stoves.

La plupart des brûleurs à gaz fonctionnent avec un robinet de contrôle du débit de gaz, accessible à un utilisateur. La figure 1 représente un schéma d'un robinet. Le robinet RBT comprend notamment un conduit 1 d'arrivée du gaz, un conduit 2 de sortie du gaz vers le brûleur BRL correspondant audit robinet, ce conduit présentant un passage de sortie 21, dont le diamètre, fixe, détermine le débit maximal de gaz dans le brûleur. Le robinet comprend en outre une partie mobile 3, appelé 'tournant', par exemple en forme de cône avec une fente à section variable, et qui est entraínée en rotation devant un orifice de diamètre fixe, permettant ainsi de régler le débit du gaz. Habituellement, le tournant est entraíné mécaniquement par une manette accessible à un utilisateur.Most gas burners operate with a shut-off valve. gas flow control, accessible to a user. Figure 1 shows a diagram of a tap. The RBT tap notably includes a pipe 1 gas inlet, a gas outlet pipe 2 to the burner BRL corresponding to said tap, this duct having an outlet passage 21, whose diameter, fixed, determines the maximum gas flow in the burner. The tap further comprises a movable part 3, called 'turning', by example in the shape of a cone with a slit with variable section, which is rotated in front of an orifice of fixed diameter, thus allowing adjust the gas flow. Usually the turn is driven mechanically by a joystick accessible to a user.

Généralement, le robinet comprend également un élément électromagnétique de sécurité, par exemple une électrovanne 4, permettant de fermer le passage de sortie 21, dans le cas, par exemple, d'une extinction intempestive de la flamme du brûleur. Cette électrovanne, par exemple, est formée d'un électroaimant 41, entraínant une pastille d'étanchéité 42, et reliée à un système de détection de flamme, par exemple un thermocouple TC situé dans la flamme F du brûleur. Lorsque la flamme s'éteint, le courant itc délivré par le thermocouple dans l'électroaimant n'est plus suffisant pour maintenir la pastille d'étanchéité 42 et celle-ci vient obturer le passage de sortie 21. L'élément de sécurité 4 est placé dans un logement d'accueil 5 du robinet, et les dimensions de ces différentes pièces sont standard, variant peu d'un fournisseur à l'autre.Generally, the valve also comprises an electromagnetic safety element, for example a solenoid valve 4, making it possible to close the outlet passage 21, in the case, for example, of an untimely extinction of the burner flame. This solenoid valve, for example, is formed of an electromagnet 41, driving a sealing pad 42, and connected to a flame detection system, for example a thermocouple TC located in the flame F of the burner. When the flame goes out, the current i tc delivered by the thermocouple in the electromagnet is no longer sufficient to maintain the sealing pad 42 and the latter closes the outlet passage 21. The security element 4 is placed in a reception housing 5 of the tap, and the dimensions of these various parts are standard, varying little from one supplier to another.

Lors de l'allumage du brûleur BRL, l'élément de sécurité doit être débrayé pour permettre l'ouverture du passage de sortie 21. Le débrayage se fait habituellement par une pression mécanique de l'utilisateur sur la manette, entraínant un mécanisme d'appui sur la pastille d'étanchéité 42, permettant ainsi l'ouverture du robinet. Lorsque la flamme est allumée, le système de détection de flamme fournit à l'électroaimant un courant itc qui permet de maintenir la pastille d'étanchéité, de telle sorte que soit maintenu ouvert le passage 21.When lighting the BRL burner, the safety element must be disengaged to allow the opening of the outlet passage 21. The disengagement is usually done by mechanical pressure of the user on the lever, causing a mechanism of pressing on the sealing pad 42, thus allowing the valve to open. When the flame is lit, the flame detection system supplies the electromagnet with a current i tc which makes it possible to maintain the sealing pad, so that the passage 21 is kept open.

Cependant, il est prévu de remplacer le tournant entraíné manuellement de certains robinets par des tournants motorisés, entraínés par exemple par des motoréducteurs, et dont la commande est assurée par une commande électronique de l'utilisateur. Notamment dans ce type de robinets, le débrayage mécanique de l'élément de sécurité en place n'est plus possible.However, it is planned to replace the driven turn manually of certain taps by motorized turning, driven by example by gearmotors, and whose control is ensured by a electronic user control. Particularly in this type of valve, the mechanical disengagement of the safety element in place is no longer possible.

On connaít un dispositif de commande électronique d'un robinet tel que décrit dans le document EP 0 939 279, qui commande l'ouverture et la fermeture d'une électrovanne de sécurité.We know an electronic control device of a tap such as described in document EP 0 939 279, which controls the opening and closing of a safety solenoid valve.

L'invention propose un dispositif de commande électronique de l'ouverture du robinet qui permet, selon un exemple d'application, de commander dans les robinets à tournants motorisés, le débrayage de l'élément de sécurité.The invention provides an electronic control device for the opening of the tap which allows, according to an example of application, to control, in motorized rotary valves, the disengagement of the element of security.

Pour cela, l'invention concerne un dispositif de commande de l'ouverture d'au moins un robinet de contrôle du débit de gaz d'un brûleur, tel que défini dans les revendications 1 à 11.For this, the invention relates to a device for controlling the opening of at least one gas flow control valve of a burner, such as defined in claims 1 to 11.

Le dispositif selon l'invention permet ainsi de commander électroniquement dans les brûleurs avec robinets à tournant motorisé l'allumage du brûleur par la commande de l'ouverture du passage de sortie du gaz dans le robinet. Mais il offre de nombreuses autres possibilités, comme par exemple la gestion de certaines fonctions de type mijotage, minuterie, ré-allumage, etc., aussi bien dans les robinets à tournant entraíné manuellement que dans ceux à tournants motorisés. Il présente l'avantage, en outre, d'utiliser une électrovanne d'encombrement comparable aux éléments électromagnétiques de sécurité de l'art antérieur, ce qui permet de ne pas changer la structure des robinets existants, ni d'ajouter d'éléments électromagnétiques supplémentaires à l'extérieur du robinet.The device according to the invention thus makes it possible to control electronically in burners with motorized rotary valves ignition of the burner by controlling the opening of the gas outlet passage in the tap. But it offers many other possibilities, such as management of certain functions such as simmer, timer, re-ignition, etc., both in manually operated ball valves and in those with motorized turning. It also has the advantage of using a solenoid valve of dimensions comparable to the electromagnetic safety elements of the prior art, which makes it possible not to change the structure of the taps or add additional electromagnetic elements to outside the tap.

D'autres avantages et caractéristiques de l'invention apparaítront à la lecture de la description qui suit, illustrée par les figures qui représentent :

  • la figure 1, un exemple de robinet de contrôle du débit du gaz selon l'art antérieur (déjà décrit) ;
  • la figure 2, un schéma d'un exemple de dispositif de commande selon l'invention ;
  • la figure 3, un exemple de réalisation d'une électrovanne selon l'invention ;
  • la figure 4, un exemple de réalisation des moyens électroniques de commande du dispositif selon l'invention ;
  • la figure 5, un chronogramme illustrant selon un exemple, le fonctionnement du dispositif selon l'invention.
Other advantages and characteristics of the invention will appear on reading the description which follows, illustrated by the figures which represent:
  • Figure 1, an example of a gas flow control valve according to the prior art (already described);
  • FIG. 2, a diagram of an example of a control device according to the invention;
  • Figure 3, an embodiment of a solenoid valve according to the invention;
  • Figure 4, an embodiment of the electronic control means of the device according to the invention;
  • Figure 5, a timing diagram illustrating according to an example, the operation of the device according to the invention.

Sur ces figures, les éléments homologues sont repérés par des références identiques.In these figures, the homologous elements are identified by identical references.

La figure 2 représente un schéma d'un exemple de dispositif de commande selon l'invention. Il s'agit de la commande d'au moins un robinet RBT de contrôle du débit de gaz d'un brûleur BRL. Sur la figure 2, un seul robinet est représenté mais le dispositif selon l'invention peut s'appliquer à la commande de plusieurs robinets correspondant chacun à un brûleur. Les brûleurs sont par exemple montés sur une table de cuisson, soit indépendante, soit intégrée dans une cuisinière. Il peut s'agir aussi de brûleurs de four gaz, de brûleurs de chaudière, et de façon générale, de tout type de brûleur à gaz dont le contrôle de débit de gaz est assuré par un robinet.FIG. 2 represents a diagram of an example of a device for control according to the invention. This is the order of at least one tap RBT for controlling the gas flow of a BRL burner. In Figure 2, only one valve is shown but the device according to the invention can be applied to the control of several valves each corresponding to a burner. The burners are for example mounted on a hob, or independent, either integrated into a stove. It can also be gas oven burners, boiler burners, and generally type of gas burner whose gas flow control is ensured by a tap.

Comme sur la figure 1, le robinet comprend notamment un conduit 1 d'arrivée du gaz, un conduit 2 de sortie du gaz vers le brûleur BRL, ledit conduit présentant un passage de sortie 21 de diamètre fixe prédéterminé et par exemple un tournant pour le contrôle du débit de gaz (non représenté). Le robinet comprend également un logement d'accueil 5 permettant de recevoir un éventuel élément électromagnétique de sécurité.As in FIG. 1, the tap notably comprises a conduit 1 gas inlet, a gas outlet pipe 2 to the burner BRL, said duct having an outlet passage 21 of predetermined fixed diameter and for example a turning point for controlling the gas flow rate (not shown). The tap also includes a reception housing 5 allowing receive any electromagnetic safety element.

Selon l'invention, le dispositif de commande comprend, pour chaque robinet, une électrovanne 4 dont l'encombrement lui permet de se loger dans le logement d'accueil 5. L'électrovanne 4 comprend notamment un électroaimant 41 et une pastille d'étanchéité 42, de taille suffisante pour permettre la fermeture du passage de sortie 21. La pastille d'étanchéité est entraínée axialement par l'électroaimant. L'électrovanne 4 comprend en outre un ressort de rappel de la pastille 42 (non représenté sur la figure 2), permettant de maintenir en position fermée le passage de sortie 21 lorsque aucune force n'est appliquée par l'électroaimant.According to the invention, the control device comprises, for each valve, a solenoid valve 4 whose size allows it to stay in the accommodation unit 5. The solenoid valve 4 includes in particular an electromagnet 41 and a sealing pad 42, of sufficient size to allow closing of the outlet passage 21. The sealing disc is driven axially by the electromagnet. The solenoid valve 4 includes in addition to a return spring for the patch 42 (not shown in FIG. 2), allowing the outlet passage 21 to be kept in the closed position when no force is applied by the electromagnet.

Un exemple de réalisation d'une électrovanne pour un dispositif selon l'invention est schématisé sur la figure 3. Il s'agit dans cet exemple d'une électrovanne comportant un électroaimant 41 dit 'en U'. L'électroaimant comporte un bobinage 43 unique, réparti sur les deux branches du U, au nombre total de spires donné et une armature 44, la pastille d'étanchéité 42 étant reliée par un axe 45 à ladite armature. Bien sûr, d'autres types d'électroaimants sont envisageables, comme par exemple les électroaimants cylindriques. Sur la figure 3, est représenté en outre le ressort de rappel (noté 46) de la pastille d'étanchéité 42, permettant de maintenir en position fermée le passage de sortie 21 lorsque aucune force n'est appliquée à l'armature par l'électroaimant. Le ressort 46 appuie sur la pastille d'étanchéité 42 et sur la structure de l'électroaimant placée autour du bobinage.An exemplary embodiment of a solenoid valve for a device according to the invention is shown schematically in Figure 3. This is in this example of a solenoid valve comprising an electromagnet 41 called 'U-shaped'. The electromagnet has a single coil 43, distributed over the two branches of the U, with the total number of turns given and a frame 44, the sealing pad 42 being connected by a pin 45 to said frame. Of course, other types of electromagnets are possible, such as for example cylindrical electromagnets. FIG. 3 also shows the spring of recall (noted 46) of the sealing pad 42, allowing to maintain in closed position outlet passage 21 when no force is applied to the armature by the electromagnet. Spring 46 presses on the pad seal 42 and on the structure of the electromagnet placed around the winding.

Selon l'invention, le dispositif comprend en outre des moyens électroniques de commande (notés 6 sur la figure 2) de l'électrovanne de chaque robinet. Ces moyens permettent de fournir dans le bobinage de chaque électrovanne un courant de pointe donné. Ce courant de pointe, ainsi que le nombre de spires dans le bobinage sont dimensionnés de telle sorte que le produit du courant de pointe avec le nombre de spires (donné en Ampères-tours) soit suffisant pour que la force électromotrice appliquée permette le déplacement de la pastille d'étanchéité 42 et l'ouverture de passage de sortie 21. Ces moyens de commande seront décrits plus en détail dans la suite. Avantageusement, l'utilisateur peut avoir accès à tout ou partie des fonctionnalités de ces moyens de commande, lui permettant par exemple de commander électroniquement l'allumage d'un brûleur.According to the invention, the device further comprises means control electronics (noted 6 in Figure 2) of the solenoid valve each tap. These means make it possible to supply, in the winding, each solenoid valve has a given peak current. This peak current, as well that the number of turns in the winding are dimensioned so that the product of the peak current with the number of turns (given in Amps) is sufficient for the electromotive force applied allows the displacement of the sealing pad 42 and the opening of outlet passage 21. These control means will be described in more detail detail below. Advantageously, the user can have access to all or part of the functionality of these control means, allowing it by example of electronically controlling the ignition of a burner.

Ainsi, l'électrovanne du dispositif de commande selon l'invention est dimensionnée de façon spécifique. Selon un exemple, dans le domaine de l'électroménager, par exemple dans le domaine des brûleurs à gaz pour tables de cuisson ou four gaz, la force de rappel du ressort est typiquement de l'ordre du Newton pour un passage de sortie 21 de diamètre d'environ 6 mm. Le ressort est dimensionné pour répondre aux normes de sécurité sur le réseau gaz. La force électromotrice appliquée à l'électroaimant doit être suffisante pour vaincre la force de rappel du ressort. La déposante a montré que dans cet exemple, avec un électroaimant en U d'un type comparable à ceux utilisés dans les éléments de sécurité de l'art antérieur, et dont l'armature doit se déplacer d'une distance d d'environ 1,5 mm, le produit du nombre de spires par le courant de pointe doit être d'environ un millier d'Ampères-tours, valeur nettement supérieure à celle nécessaire pour le simple maintien de l'armature. Pour ce faire, le nombre de spires du bobinage est par exemple d'environ un millier. Ce nombre est largement supérieur au nombre de spires classiquement rencontré dans un élément de sécurité présentant également un électroaimant en U (en effet, dans ce type d'électroaimant, le nombre de spires est d'une dizaine sur chaque bobine). Pour respecter les contraintes d'encombrement, la déposante propose dans cet exemple, un bobinage unique dont la section du fil a un diamètre sensiblement inférieur au dixième de millimètre, ce qui est sensiblement un ordre de grandeur inférieur à ce qui se fait dans un élément de sécurité classique.Thus, the solenoid valve of the control device according to the invention is dimensioned in a specific way. According to one example, in the field of household appliances, for example in the field of gas burners for hobs or gas oven, the spring return force is typically of the order of Newton for an outlet passage 21 with a diameter of about 6 mm. The spring is sized to meet safety standards on the gas network. The electromotive force applied to the electromagnet must be sufficient to overcome the return force of the spring. The applicant showed that in this example, with a U-shaped electromagnet of a type comparable to those used in the security elements of the prior art, and of which the armature must move a distance d of about 1.5 mm, the product of number of turns per peak current should be around a thousand Ampere-towers, a value significantly higher than that necessary for the simple support of the frame. To do this, the number of turns of the winding is for example around a thousand. This number is largely greater than the number of turns conventionally encountered in an element of safety also having a U-shaped electromagnet (indeed, in this type electromagnet, the number of turns is about ten on each coil). To comply with the space constraints, the applicant proposes in this example, a single winding whose section of wire has a diameter significantly less than a tenth of a millimeter, which is substantially a order of magnitude lower than what is done in a security element classic.

Les moyens de commande 6 (voir figure 2) comprennent des moyens de contrôle 61 de la quantité d'énergie délivrée dans le bobinage de chaque électrovanne lorsque le courant de pointe est fourni. En effet, la section du fil étant réduite, la résistivité est très grande et des moyens de sécurité doivent être mis en place pour limiter la puissance dissipée dans le bobinage en fonction du temps. la figure 4 illustre un exemple de réalisation des moyens de commande illustrant ces moyens de contrôle. Ils sont par exemple formés d'un condensateur C dans lequel est accumulée l'énergie nécessaire au déplacement de la pastille d'étanchéité d'une électrovanne. Le circuit de charge du condensateur C est formé dans l'exemple de la figure 4 par un générateur de tension U0 connecté aux bornes du condensateur par l'intermédiaire d'un réseau comprenant en parallèle une première résistance R1 (permettant de maintenir les courants de fuite de la capacité) et une seconde résistance R2 en série avec un premier interrupteur CT1. Par interrupteur, on entend tout type d'interrupteur, mécanique, ou électrique (interrupteur formé d'un transistor). L'interrupteur CT1 se ferme brièvement (pendant une durée environ égale à trois fois le produit de la valeur de R2 par celle de la capacité du condensateur, soit typiquement 1 seconde) pour accélérer la charge du condensateur C, par exemple de 0 à 50 V, puis R1 maintient cette charge. Cette opération est faite automatiquement par exemple lors de la mise sous tension de la table de cuisson ou du four, ou à la suite de l'allumage d'un premier brûleur. Ainsi, le condensateur est rechargé immédiatement et prêt à se décharger à nouveau dans le bobinage d'une électrovanne. On pourrait prévoir un condensateur de ce type par électrovanne mais en pratique, un seul condensateur est réellement nécessaire pour l'ensemble des électrovannes correspondant aux brûleurs, car l'utilisateur allume généralement les brûleurs les uns après les autres, et non simultanément.The control means 6 (see FIG. 2) comprise means 61 for controlling the quantity of energy delivered in the winding of each solenoid valve when the peak current is supplied. Indeed, the section of the wire being reduced, the resistivity is very high and safety means must be put in place to limit the power dissipated in the winding as a function of time. FIG. 4 illustrates an exemplary embodiment of the control means illustrating these control means. They are for example formed by a capacitor C in which is accumulated the energy necessary for the displacement of the sealing pad of a solenoid valve. The charging circuit of the capacitor C is formed in the example of FIG. 4 by a voltage generator U 0 connected to the terminals of the capacitor via a network comprising in parallel a first resistor R 1 (making it possible to maintain the capacity leakage currents) and a second resistor R 2 in series with a first switch CT 1 . By switch is meant any type of switch, mechanical or electrical (switch formed by a transistor). The switch CT 1 closes briefly (for a duration approximately equal to three times the product of the value of R 2 by that of the capacitance of the capacitor, ie typically 1 second) to accelerate the charging of the capacitor C, for example of 0 at 50 V, then R 1 maintains this charge. This operation is done automatically, for example when the hob or oven is switched on, or after a first burner has been ignited. Thus, the capacitor is recharged immediately and ready to discharge again in the winding of a solenoid valve. One could provide a capacitor of this type per solenoid valve but in practice, only one capacitor is really necessary for all of the solenoid valves corresponding to the burners, because the user generally ignites the burners one after the other, and not simultaneously.

Les moyens de commande comprennent d'autre part selon cet exemple, et pour chaque brûleur, des moyens de transfert 62 de l'énergie accumulée dans le condensateur vers le bobinage 43 de l'électrovanne du robinet du brûleur, pour déplacer la pastille d'étanchéité de l'électrovanne et permettre l'ouverture du passage de sortie dudit robinet. Par exemple, comme cela est illustré sur la figure 4, les moyens de transfert sont assurés grâce à un interrupteur CT2. Le condensateur C en effet se décharge dans le bobinage 43 de l'électrovanne par l'intermédiaire de l'interrupteur CT2, générant un courant ib dans le bobinage. Il y a un interrupteur par électrovanne. L'interrupteur CT2 est par exemple commandé par l'utilisateur lorsque celui-ci veut allumer le brûleur correspondant.The control means furthermore comprise, according to this example, and for each burner, means 62 for transferring the energy accumulated in the capacitor to the winding 43 of the solenoid valve of the burner tap, to move the disc of sealing of the solenoid valve and allow the opening of the outlet passage of said valve. For example, as illustrated in FIG. 4, the transfer means are provided by means of a switch CT 2 . The capacitor C in fact discharges into the winding 43 of the solenoid valve via the switch CT 2 , generating a current i b in the winding. There is one switch per solenoid valve. The switch CT 2 is for example controlled by the user when he wants to light the corresponding burner.

Les moyens électroniques de commande comprennent d'autre part pour chaque électrovanne des moyens d'apport 63 d'un courant de maintien dans le bobinage de l'électrovanne, permettant de maintenir la pastille d'étanchéité de sorte à maintenir ouvert le passage de sortie 21 du robinet correspondant. Dans l'exemple de la figure 4, les moyens d'apport du courant de maintien sont réalisés par une source d'énergie U1 connectée aux bornes de la bobine par l'intermédiaire d'une résistance R3 en série avec un troisième interrupteur CT3. L'interrupteur CT3 se ferme par exemple sensiblement en même temps que l'interrupteur CT2, permettant d'assurer immédiatement le courant de maintien. Lorsque le condensateur C s'est déchargé dans la bobine de l'électrovanne, l'interrupteur CT2 s'ouvre (et le condensateur peut de nouveau être chargé) tandis que l'interrupteur CT3 reste fermé.The electronic control means furthermore comprise, for each solenoid valve, means for supplying 63 of a holding current in the winding of the solenoid valve, making it possible to maintain the sealing pad so as to keep the outlet passage open. 21 from the corresponding tap. In the example of FIG. 4, the means for supplying the holding current are produced by an energy source U 1 connected to the terminals of the coil via a resistor R 3 in series with a third switch CT 3 . The CT switch 3 closes for example substantially at the same time as the CT switch 2 , making it possible to immediately provide the holding current. When the capacitor C has discharged in the solenoid valve coil, the CT switch 2 opens (and the capacitor can be charged again) while the CT switch 3 remains closed.

L'ouverture de l'interrupteur CT3 peut être par exemple commandée par l'utilisateur lorsque celui-ci veut fermer le brûleur.The opening of the switch CT 3 can for example be controlled by the user when he wants to close the burner.

Selon une variante (illustrée sur la figure 2), les moyens électroniques de commande comprennent en outre une électronique de mesure 64 d'un signal émis par un système de détection de la flamme, par exemple un thermocouple TC placé dans la flamme F de chacun des brûleurs. Le signal mesuré est envoyé par exemple vers les moyens d'apport 63 du courant de maintien du robinet correspondant au brûleur, permettant en cas d'extinction intempestive de la flamme, l'arrêt de l'apport du courant de maintien et la fermeture du passage de sortie du robinet. Par exemple, le signal mesuré permet l'ouverture de l'interrupteur CT3, dans l'exemple de la figure 4.According to a variant (illustrated in FIG. 2), the electronic control means also comprise electronic measurement 64 of a signal emitted by a flame detection system, for example a thermocouple TC placed in the flame F of each burners. The measured signal is sent, for example, to the means 63 for supplying the holding current of the tap corresponding to the burner, allowing, in the event of an untimely extinction of the flame, stopping the supply of the holding current and closing the tap outlet passage. For example, the measured signal allows the opening of the switch CT 3 , in the example of FIG. 4.

En pratique, les moyens de commande 6 comprennent une gestion séquentielle des différents interrupteurs, par exemple au moyen d'une machine d'états, ou d'un microcontrôleur avec un programme de séquencement. L'utilisateur agit alors sur ces moyens de commande en déclenchant une séquence.In practice, the control means 6 comprise a sequential management of the different switches, for example by means a state machine, or a microcontroller with a program sequencing. The user then acts on these control means by triggering a sequence.

La figure 5 illustre par un chronogramme donnant le courant ib dans le bobinage en fonction du temps t, un exemple de fonctionnement du dispositif selon l'invention reprenant des moyens de commande du type de ceux décrits sur la figure 4. Lors de la mise sous tension, CT1 s'est fermé brièvement, permettant la charge du condensateur. A l'instant t0, l'utilisateur décide d'allumer un brûleur, et commande la fermeture de l'interrupteur CT2. Le condensateur se décharge dans le bobinage 43, entraínant un courant de pointe ip dans le bobinage, qui permet le déplacement de l'armature du robinet correspondant, et l'ouverture du passage de sortie. En parallèle, CT3 se ferme également, assurant dans le bobinage un courant de maintien im. Puis à l'instant t1, l'utilisateur par exemple, décide d'éteindre le brûleur, et commande l'ouverture de l'interrupteur CT3. L'opération peut être renouvelée, sur chacun des brûleurs.FIG. 5 illustrates by a timing diagram giving the current i b in the winding as a function of time t, an example of operation of the device according to the invention incorporating control means of the type of those described in FIG. 4. When switching on under voltage, CT 1 closed briefly, allowing the capacitor to be charged. At time t 0 , the user decides to light a burner, and orders the closing of the switch CT 2 . The capacitor discharges into the winding 43, causing a peak current i p in the winding, which allows the displacement of the armature of the corresponding valve, and the opening of the outlet passage. In parallel, CT 3 also closes, ensuring in the winding a holding current i m . Then at time t 1 , the user for example, decides to extinguish the burner, and orders the opening of the switch CT 3 . The operation can be repeated on each of the burners.

Le dispositif de commande selon l'invention ouvre de multiples possibilités d'applications. Outre la commande électronique par un utilisateur de l'allumage d'un robinet, il permet des fonctions de type ré-allumage, mijotage séquentiel, minuterie, etc. Pour le ré-allumage par exemple, si l'on reprend l'exemple de réalisation des moyens de contrôle de la figure 4, une détection d'absence de flamme sur un brûleur peut entraíner la fermeture de CT2 et de CT3, afin de décharger le condensateur dans le bobinage pour ré-allumer le brûleur et de le maintenir allumé grâce au courant de maintien. En mijotage séquentiel, la fermeture et l'ouverture des interrupteurs CT2 et CT3 peuvent être commandées séquentiellement pour assurer l'allumage séquentiel du brûleur et permettre le mijotage.The control device according to the invention opens up multiple possibilities of applications. In addition to the electronic control by a user of the ignition of a tap, it allows re-ignition, sequential simmer, timer, etc. For re-ignition for example, if we take the example of embodiment of the control means of Figure 4, a detection of absence of flame on a burner can cause the closure of CT 2 and CT 3 , so discharge the capacitor in the winding to re-light the burner and keep it lit thanks to the holding current. In sequential simmering, the closing and opening of switches CT 2 and CT 3 can be controlled sequentially to ensure sequential ignition of the burner and allow simmering.

Claims (11)

  1. Apparatus for controlling opening of at least one tap (RBT) for controlling the gas flow to a burner, the said tap comprising in particular a gas inlet duct (1), a duct (2) for outlet of the gas to the burner, the said outlet duct having an outlet passage (21) of a predetermined fixed diameter, and a valve housing (5) for an electrical safety valve for closing the outlet passage in the event of accidental extinction of the flame (F) of the burner, the control apparatus comprising:
    for each tap, an electrical valve (4) constituting a safety valve, the size of which is such that it is able to be mounted within the valve housing (5), and which comprises, in particular, an electromagnet (41), a sealing piston (42) of sufficient size to permit closing of the said outlet passage and driven axially by the electromagnet, and a return spring (46) for the said piston, enabling a closed position of the said outlet passage to be maintained, the electromagnet having a single winding (43) with a given number of turns for also permitting opening of the outlet passage (21),
    and electronic means (6) for controlling the said electrical valve or valves, and for enabling a given peak current (ip) to be fed into the winding of each electrical valve, the said peak current being such that the product of the latter multiplied by the number of turns is sufficient for the electromotive force applied by the electromagnet to cause the piston (42) of the electrical valve (4) to be displaced during opening of the outlet passage (21),
    characterised in that the electronic control means.(6) include means (61) for controlling the power dissipated in the winding of each electrical valve as a function of time during opening of the outlet passage, the said control means (61) including a capacitor (C) and a charging circuit for the said capacitor which enables the said energy necessary for displacement of a sealing piston of an electrical valve to accumulate.
  2. Apparatus according to Claim 1, characterised in that the said electronic control means further comprise
    for each tap, means (62) for transferring the energy accumulated in the capacitor to the winding (43) of the electrical valve of the tap, whereby to displace the sealing piston of the said electrical valve,
    for each tap, means (63) for delivering a holding current (im) into the winding of the electrical valve of the said tap, whereby to hold the sealing piston of the said electrical valve in such a way as to keep the outlet passage of the said tap open.
  3. Apparatus according to Claim 2, characterised in that the said transfer means (62) and the said holding current delivery means (63) are controllable by a user whereby to control, respectively, the opening and closing of the outlet passage of the corresponding tap.
  4. Apparatus according to Claim 2 or Claim 3, characterised in that the electronic control means further include an electronic device (64) for measuring at least one signal emitted by at least one system for detection of the flame (F) of a burner, the measured signal being passed to the means (63) for delivering the holding current of the tap of the said burner, whereby, in the event of accidental extinction of the flame (F), to stop the delivery of the said holding current into the electrical valve of the said tap, and to close the outlet passage of the tap.
  5. Apparatus according to one of the preceding Claims, characterised in that the electromagnet of the said electrical valve is U-shaped, and comprises in particular a winding distributed over the two branches of the U, and an armature (44), the sealing piston of the electrical valve being connected to the said armature through a rod (45).
  6. Apparatus according to Claim 5, characterised in that, with the return force of the spring of the said electrical valve being of the order of 1 Newton, the displacement (d) of the armature being about 1.5 mm, the product of the number of turns in the winding multiplied by the peak current is of the order of 1000 ampère-turns.
  7. Apparatus according to Claim 6, characterised in that the number of turns in the winding is of the order of 1000, and the cross section of the wire that constitutes the winding has a diameter substantially less than one tenth of a millimetre.
  8. Apparatus according to one of Claims 1 to 4, characterised in that the electromagnet of the said electrical valve is cylindrical, and in particular includes a winding and a core sliding in the said winding, the sealing piston of the electrical valve being fixed to the said core.
  9. Apparatus according to one of the preceding Claims, characterised in that, with the tap or taps equipped with a motorised flow control system which is controllable electronically by a user, control of opening of the said tap or taps by the user enables, in particular, the corresponding burner to be lit.
  10. A cooking hob with at least one gas burner and a gas flow control tap for each burner, the said tap comprising, in particular, a gas inlet duct, a duct for outlet of gas to the burner, the said outlet duct having an outlet passage of predetermined fixed diameter, together with a housing for receiving an electrical safety valve for closing the said outlet passage, characterised in that it includes a device for controlling opening of the tap or taps according to one of the preceding Claims.
  11. A gas oven with at least one gas burner and a gas flow control tap for each burner, the said tap comprising, in particular, a gas inlet duct, a duct for outlet of gas to the burner, the said outlet duct having an outlet passage of predetermined fixed diameter, together with a housing for receiving an electrical safety valve for closing the said outlet passage, characterised in that it includes a device for controlling opening of the tap or taps according to one of Claims 1 to 9.
EP00402919A 1999-10-22 2000-10-20 Control device for opening the safety valve of the gas flow of a burner Expired - Lifetime EP1094276B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9913216 1999-10-22
FR9913216A FR2800154B1 (en) 1999-10-22 1999-10-22 DEVICE FOR CONTROLLING THE OPENING OF A TAP FOR CONTROLLING THE GAS FLOW OF A BURNER

Publications (2)

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EP1094276A1 EP1094276A1 (en) 2001-04-25
EP1094276B1 true EP1094276B1 (en) 2004-01-28

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EP00402919A Expired - Lifetime EP1094276B1 (en) 1999-10-22 2000-10-20 Control device for opening the safety valve of the gas flow of a burner

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EP (1) EP1094276B1 (en)
DE (1) DE60007933T2 (en)
ES (1) ES2215012T3 (en)
FR (1) FR2800154B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11442487B2 (en) 2020-02-28 2022-09-13 Midea Group Co., Ltd. Appliance burner assignment indication
US11841145B2 (en) 2020-02-28 2023-12-12 Midea Group Co., Ltd. Configurable control selectors

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1233793B (en) * 1964-05-27 1967-02-09 Krefft Aktien Ges W Device for securing gas burners on gas appliances
BE759396A (en) * 1969-11-25 1971-04-30 Junkers & Co MAGNET SEALS, IN PARTICULAR FOR MONITORING DEVICES OF GAS HEATING APPLIANCES
DE2605461C2 (en) * 1976-02-12 1986-02-06 GoGas Goch GmbH & Co, 4600 Dortmund Device for controlling a burner
DE2710940A1 (en) * 1977-03-12 1978-09-14 Ernst Ing Grad Sandmann Electronic monitor for gas fired appliances - closes safety valve on flame failure and responds to gas leaks
JPS5528409A (en) * 1978-08-17 1980-02-29 Atago Seisakusho:Kk Electromagnetic holding valve control system of heat apparatus
JPS58175719A (en) * 1982-04-06 1983-10-15 Matsushita Electric Ind Co Ltd Safety device for gas ignition
JPS58178118A (en) * 1982-04-09 1983-10-19 Matsushita Electric Ind Co Ltd Safety device for ignition of gas
JPS59122816A (en) * 1982-07-21 1984-07-16 Paloma Ind Ltd Combustion controller of gas burner
DE4206875A1 (en) * 1992-03-05 1993-09-16 Pierburg Gmbh Gas pressure regulation system, esp. for heating system - controls electromagnetically driven proportional valve according to actual load pressure using electronic controller
FR2758179A1 (en) * 1997-01-07 1998-07-10 Eaton Sa Monaco Flame monitoring and automatic cut-off for gas cooker or heater

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Publication number Publication date
FR2800154B1 (en) 2002-03-22
DE60007933T2 (en) 2004-12-23
DE60007933D1 (en) 2004-03-04
FR2800154A1 (en) 2001-04-27
EP1094276A1 (en) 2001-04-25
ES2215012T3 (en) 2004-10-01

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