EP0288390A1 - Security apparatus for gas valves - Google Patents

Security apparatus for gas valves Download PDF

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Publication number
EP0288390A1
EP0288390A1 EP88400980A EP88400980A EP0288390A1 EP 0288390 A1 EP0288390 A1 EP 0288390A1 EP 88400980 A EP88400980 A EP 88400980A EP 88400980 A EP88400980 A EP 88400980A EP 0288390 A1 EP0288390 A1 EP 0288390A1
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EP
European Patent Office
Prior art keywords
valve
coil
thermocouple
flap
electric switch
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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.)
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EP88400980A
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German (de)
French (fr)
Inventor
Claude Dauget
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Chaffoteaux et Maury SAS
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Chaffoteaux et Maury SAS
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Publication date
Application filed by Chaffoteaux et Maury SAS filed Critical Chaffoteaux et Maury SAS
Publication of EP0288390A1 publication Critical patent/EP0288390A1/en
Withdrawn legal-status Critical Current

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    • 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
    • F23N2227/00—Ignition or checking
    • F23N2227/22—Pilot burners

Definitions

  • the invention relates to the safety devices associated with the fuel gas supply valves of the burners fitted to heating appliances such as water heaters, bath heaters, boilers, etc. equipped with a pilot light.
  • valves which include a gas valve capable of being cocked by hand in its open position, this valve being associated with an electromagnetic coil in such a way as to maintain it in the open or armed position.
  • the valve is provided by circulation in the coil of the electric current generated by the simple heating of a thermocouple by the pilot.
  • these safety devices include an electrical switch mounted on the circuit which connects the thermocouple to the coil.
  • thermocouple As the potential difference generated by the thermocouple is relatively small, namely of the order of a few tens of mV, it is important that the overall electrical resistance of the circuit considered is itself very low, namely generally less than 100 milli-ohms (m ⁇ ).
  • the object of the invention is, above all, to eliminate these latter drawbacks.
  • the safety devices of the type in question according to the invention are essentially characterized in that their electrical switches as defined above are constituted by MOS type transistors having a very low drain-source resistance to the conductive state, this resistance preferably being less than 30 m ⁇ .
  • the invention includes, apart from this main arrangement, certain other arrangements which are preferably used at the same time and which will be more explicitly discussed below.
  • FIGS 1 and 2 schematically show a safety device established according to the invention respectively in operation, pilot light on, and at rest, pilot light off.
  • the safety device considered is associated with a burner 1 capable of being supplied with combustible gas from a pipe 2 through successively a safety valve 3 and a terminal gas valve 4.
  • the purpose of the device is to exercise safety from certain dangers (air pollution, fouling of a duct, breakdown of ventilation, lack of water, etc.) by automatically closing valve 3 as soon as predetermined thresholds are crossed by appropriate parameters representative of these hazards.
  • valve 3 By extension it can also be envisaged that the indicated automatic closing of the valve 3 is triggered by phenomena which are not particularly dangerous but which are interesting to consider in certain circumstances, such as a temperature (ambient temperature, water temperature circulating in a central heating circuit ).
  • the safety valve 3 is composed of a "magnetic plug" itself comprising a gas valve 5 suitable for cooperating with a seat 6 and secured to a rod 7 comprising at one of its ends a clean magnetic pallet 8 closing the magnetic field lines of a U-shaped magnetic circuit 9 on which a coil 10 is wound.
  • the coil 10 of the electromagnet thus formed is supplied with direct current, via a circuit 11, from a thermocouple 12 capable of being placed in the flame 13 of a pilot light.
  • This pilot light 13 is itself supplied by the combustible gas withdrawn, downstream of the valve 3, in a section of pipe 14 connecting this valve to the gas valve 4.
  • thermocouple 12 The electric current i generated by the thermocouple 12 when the latter is heated by the pilot 13 is very low.
  • this switch was constituted by a mechanical contact in the previously known embodiments: such an embodiment seemed inevitable due to the extreme smallness required for the internal electrical resistance of the contact in question.
  • such a MOS transistor is used to constitute the electrical contact 16 of the circuit 11.
  • the MOS transistor is a field effect transistor whose gate or base is isolated by a very insulating layer of silicon oxide.
  • the device 17 shows schematically a device capable of detecting the parameter (degree of pollution, temperature, etc.) whose progression beyond a predetermined threshold must automatically trigger the closing of the valve 3.
  • This device is arranged so as to develop a DC voltage of low amplitude which is applied to the base of the transistor 16 as long as the threshold in question is not crossed, said voltage canceling out automatically as soon as said threshold is crossed.
  • the transistor 16 is conductive, its internal resistance is very low and its presence in the circuit 11 practically does not affect the intensity of the current i when this current is generated by thermocouple 12.
  • Burner 1 then ignites automatically as soon as that the gas valve 4 is open, this opening being controlled for example by drawing domestic hot water in the case of a water heater or bath heater.
  • the burner 1 then goes out as soon as said gas valve 4 is closed.
  • thermocouple 12 If the pilot light 13 goes out, for example following a gale or an air discharge, the thermocouple 12 is no longer heated, the current i generated by heating this thermocouple is canceled and the same applies to the force F: the return force R of the spring 15 then closes the valve 3 by applying the valve 5 against its seat 6.
  • This device has a certain number of advantages compared to those previously known, in particular with regard to the reliability and the longevity of the safety contact 16 because it is produced by static semiconductor elements which are much less vulnerable. as mechanical contacts with moving parts.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Control Of Combustion (AREA)

Abstract

Security device associated with the valve (3) for supplying fuel gas of the burner (1) of a heating apparatus equipped with a pilot flame (13), said valve comprising a flap (5) which is capable of being set manually in its opening position, this flap being associated with an electromagnetic coil (10) in such a manner that retention in the open set position of the flap is ensured by circulation in the coil of the electric current generated by the simple heating of a thermocouple (12) by the pilot flame, the required safety being obtained by opening of an electric switch (16) mounted on the circuit which connects the thermocouple to the coil. The electric switch (16) is constituted by a MOS-type transistor which has very low drain-source resistance in the conductive state. <IMAGE>

Description

L'invention est relative aux dispositifs de sécurité associés aux vannes d'alimentation en gaz com­bustible des brûleurs équipant les appareils de chauffa­ge tels que chauffe-eau, chauffe-bains, chaudières, ... équipés d'une veilleuse.The invention relates to the safety devices associated with the fuel gas supply valves of the burners fitted to heating appliances such as water heaters, bath heaters, boilers, etc. equipped with a pilot light.

Elle vise plus spécialement, parmi ces disposi­tifs, ceux qui comprennent un clapet-gaz susceptible d'être armé à la main en sa position d'ouverture, ce clapet étant associé à une bobine électromagnétique de façon telle que le maintien en position ouverte ou armée du clapet soit assuré par circulation dans la bobine du courant électrique engendré par le simple chauffage d'un thermocouple par la veilleuse.More specifically, it is intended, among these devices, those which include a gas valve capable of being cocked by hand in its open position, this valve being associated with an electromagnetic coil in such a way as to maintain it in the open or armed position. the valve is provided by circulation in the coil of the electric current generated by the simple heating of a thermocouple by the pilot.

Dans les modes de réalisation connus, ces dispo­sitifs de sécurité comprennent un interrupteur électri­que monté sur le circuit qui relie le thermocouple à la bobine.In known embodiments, these safety devices include an electrical switch mounted on the circuit which connects the thermocouple to the coil.

Comme la différence de potentiel engendrée par le thermocouple est relativement faible, savoir de l'or­dre de quelques dizaines de mV, il importe que la résis­tance électrique globale du circuit considéré soit elle-­même très faible, savoir en général inférieure à 100 milli-ohms (mΩ).As the potential difference generated by the thermocouple is relatively small, namely of the order of a few tens of mV, it is important that the overall electrical resistance of the circuit considered is itself very low, namely generally less than 100 milli-ohms (mΩ).

Une telle exigence excluait jusqu'à ce jour dans la pratique l'utilisation de jonctions à semi-conducteur pour l'établissement des interrupteurs électriques considérés, du fait de la résistance interne relative­ment élevée de ces jonctions.Such a requirement has hitherto excluded in practice the use of semiconductor junctions for the establishment of the electrical switches considered, due to the relatively high internal resistance of these junctions.

On avait donc recours pour ces interrupteurs à des contacts mécaniques.Mechanical switches were therefore used for these switches.

Ces derniers devaient présenter lors de leurs fermetures des résistances électriques très faibles, de l'ordre de quelques mΩ seulement, et la valeur très fai­ble de ces résistances de contact devait être conservée dans le temps.When they closed, they had to present very low electrical resistances, the order of only a few mΩ, and the very low value of these contact resistances had to be preserved over time.

Dans la pratique, cette conservation était très difficile à obtenir du fait notamment des oxydations des contacts considérés, de leurs salissures, dues notamment aux poussières, des vibrations auxquelles sont soumis les appareils de chauffage lors de leur fonctionnement, etc.In practice, this conservation was very difficult to obtain owing in particular to the oxidation of the contacts under consideration, their soiling, due in particular to dust, the vibrations to which the heating appliances are subjected during their operation, etc.

L'invention a pour but, surtout, de supprimer ces derniers inconvénients.The object of the invention is, above all, to eliminate these latter drawbacks.

A cet effet, les dispositifs de sécurité du gen­re en question selon l'invention sont essentiellement caractérisés en ce que leurs interrupteurs électriques tels que définis ci-dessus sont constitués par des tran­sistors de type MOS présentant une très faible résistan­ce drain-source à l'état conducteur, cette résistance étant de préférence inférieure à 30 mΩ.To this end, the safety devices of the type in question according to the invention are essentially characterized in that their electrical switches as defined above are constituted by MOS type transistors having a very low drain-source resistance to the conductive state, this resistance preferably being less than 30 mΩ.

L'invention comprend, mise à part cette disposi­tion principale, certaines autres dispositions qui s'u­tilisent de préférence en même temps et dont il sera plus explicitement question ci-après.The invention includes, apart from this main arrangement, certain other arrangements which are preferably used at the same time and which will be more explicitly discussed below.

Dans ce que suit, l'on va décrire un mode de réalisation préféré de l'invention en se référant au dessin ci-annexé d'une manière bien entendu non limita­tive.In what follows, a preferred embodiment of the invention will be described with reference to the attached drawing, of course in a non-limiting manner.

Les figures 1 et 2, de ce dessin, montrent sché­matiquement un dispositif de sécurité établi selon l'in­vention respectivement en fonctionnement, veilleuse allumée, et au repos, veilleuse éteinte.Figures 1 and 2, of this drawing, schematically show a safety device established according to the invention respectively in operation, pilot light on, and at rest, pilot light off.

Le dispositif de sécurité considéré est associé à un brûleur 1 susceptible d'être alimenté en gaz com­bustible à partir d'une canalisation 2 à travers succes­sivement une vanne de sécurité 3 et un clapet-gaz termi­nal 4.The safety device considered is associated with a burner 1 capable of being supplied with combustible gas from a pipe 2 through successively a safety valve 3 and a terminal gas valve 4.

Le dispositif en question a pour but d'exercer une sécurité vis-à-vis de certains dangers (pollution de l'atmosphère, encrassement d'un conduit, panne de venti­lation, manque d'eau, ...) en fermant automatiquement la vanne 3 dès que des seuils prédéterminés sont franchis par des paramètres appropriés représentatifs de ces dan­gers.The purpose of the device is to exercise safety from certain dangers (air pollution, fouling of a duct, breakdown of ventilation, lack of water, etc.) by automatically closing valve 3 as soon as predetermined thresholds are crossed by appropriate parameters representative of these hazards.

Par extension on peut également envisager que la fermeture automatique indiquée de la vanne 3 soit dé­clenchée par des phénomènes qui ne sont pas spécialement dangereux mais qui sont intéressants à considérer dans certaines circonstances, tels qu'une température (tempé­rature ambiante, température de l'eau en circulation dans un circuit de chauffage central ...).By extension it can also be envisaged that the indicated automatic closing of the valve 3 is triggered by phenomena which are not particularly dangerous but which are interesting to consider in certain circumstances, such as a temperature (ambient temperature, water temperature circulating in a central heating circuit ...).

La vanne de sécurité 3 est composée d'un "bou­chon magnétique" comprenant lui-même un clapet-gaz 5 propre à coopérer avec un siège 6 et solidaire d'une tige 7 comportant à l'une de ses extrémités une palette magnétique 8 propre à refermer les lignes de champ ma­gnétique d'un circuit magnétique 9 en U sur lequel est enroulée une bobine 10.The safety valve 3 is composed of a "magnetic plug" itself comprising a gas valve 5 suitable for cooperating with a seat 6 and secured to a rod 7 comprising at one of its ends a clean magnetic pallet 8 closing the magnetic field lines of a U-shaped magnetic circuit 9 on which a coil 10 is wound.

La bobine 10 de l'électro-aimant ainsi formé est alimentée en courant continu, par l'intermédiaire d'un circuit 11, à partir d'un thermocouple 12 susceptible d'être placé dans la flamme 13 d'une veilleuse.The coil 10 of the electromagnet thus formed is supplied with direct current, via a circuit 11, from a thermocouple 12 capable of being placed in the flame 13 of a pilot light.

Cette veilleuse 13 est alimentée elle-même par le gaz combustible prélevé, en aval de la vanne 3, dans un tronçon de canalisation 14 reliant cette vanne au clapet-gaz 4.This pilot light 13 is itself supplied by the combustible gas withdrawn, downstream of the valve 3, in a section of pipe 14 connecting this valve to the gas valve 4.

De plus elle est agencée de façon à allumer le brûleur 1 lorsque celui-ci est alimenté en gaz à travers successivement les organes de contrôle 3 et 4 ouverts tous les deux.In addition, it is arranged so as to ignite the burner 1 when the latter is supplied with gas successively through the control members 3 and 4 both open.

Le courant électrique i engendré par le thermo­couple 12 quand celui-ci est chauffé par la veilleuse 13 est très faible.The electric current i generated by the thermocouple 12 when the latter is heated by the pilot 13 is very low.

Mais si la résistance électrique globale du cir­cuit 11 est elle-même suffisamment faible, savoir par exemple inférieure à 100 mΩ, la circulation de ce cou­rant i dans la bobine 10 engendre sur la palette magné­tique 8 et donc sur le clapet 5 une force F suffisante pour surpasser la force de rappel R d'un léger ressort 15 sollicitant ledit clapet 5 vers sa position de ferme­ture pour laquelle il est appliqué contre le siège 6.But if the overall electrical resistance of the circuit 11 is itself sufficiently low, namely for example less than 100 mΩ, the circulation of this current i in the coil 10 generates on the magnetic plate 8 and therefore on the valve 5 a sufficient force F to overcome the return force R of a light spring 15 urging said valve 5 towards its closed position for which it is applied against the seat 6.

C'est sur le circuit 11 qu'est monté un inter­rupteur électrique 16 de 'sécurité" normalement fermé et propre à être ouvert lorsque se manifeste le "danger" vis-à-vis duquel on désire être protégé.It is on the circuit 11 that is mounted an electric switch 16 of "safety" normally closed and suitable for being opened when the "danger" manifests against which one wishes to be protected.

Comme indiqué plus haut, cet interrupteur était constitué par un contact mécanique dans les réalisations antérieurement connues : une telle réalisation semblait inévitable en raison de l'extrême petitesse exigée pour la résistance électrique interne du contact en question.As indicated above, this switch was constituted by a mechanical contact in the previously known embodiments: such an embodiment seemed inevitable due to the extreme smallness required for the internal electrical resistance of the contact in question.

Or la demanderesse a constaté qu'il existait maintenant sur le marché certains interrupteurs électro­niques présentant une résistance interne extrêmement faible sous certaines conditions et qu'il était donc possible de les utiliser dans le cadre exposé ci­dessus : c'est le cas des transistors de type MOS pré­sentant une résistance drain-source extrêmement faible à l'état conducteur, c'est-à-dire dès que leur base est alimentée sous une tension minimum très faible, par exemple de l'ordre de 2,5 V.However, the Applicant has noted that there are now on the market certain electronic switches having an extremely low internal resistance under certain conditions and that it was therefore possible to use them within the framework described above: this is the case of type transistors MOS having an extremely low drain-source resistance in the conductive state, that is to say as soon as their base is supplied with a very low minimum voltage, for example of the order of 2.5 V.

On utilise donc selon l'invention un tel tran­sistor MOS pour constituer le contact électrique 16 du circuit 11.Therefore, according to the invention, such a MOS transistor is used to constitute the electrical contact 16 of the circuit 11.

Comme on le sait, le transistor MOS est un tran­sistor à effect de champ dont la grille ou base est iso­lée par une couche très isolante d'oxyde de silicium.As is known, the MOS transistor is a field effect transistor whose gate or base is isolated by a very insulating layer of silicon oxide.

Un exemple d'un tel transistor ayant donné toute satisfaction, et donné à titre purement illustratif, est celui diffusé sous la référence SN P 60 NO 5 en boîtier TO 220 AB par la Société SILICONIX : la résistance in­terne drain-source de ce transistor est de 20 mΩ seule­ment lorsqu'une faible tension est appliquée sur sa base.An example of such a transistor having given all satisfaction, and given purely by way of illustration, is that distributed under the reference SN P 60 NO 5 in a housing. TO 220 AB by the company SILICONIX: the internal drain-source resistance of this transistor is only 20 mΩ when a low voltage is applied to its base.

On a schématisé sur le dessin par le rectangle 17 un dispositif propre à détecter le paramètre (degré de pollution, température, ...) dont la progression au-­delà d'un seuil prédéterminé doit déclencher automati­quement la fermeture de la vanne 3.The device 17 shows schematically a device capable of detecting the parameter (degree of pollution, temperature, etc.) whose progression beyond a predetermined threshold must automatically trigger the closing of the valve 3.

Ce dispositif est agencé de façon à élaborer une tension continue de faible amplitude qui est appliquée sur la base du transistor 16 tant que le seuil en ques­tion n'est pas franchi, ladite tension s'annulant auto­matiquement dès franchissement dudit seuil.This device is arranged so as to develop a DC voltage of low amplitude which is applied to the base of the transistor 16 as long as the threshold in question is not crossed, said voltage canceling out automatically as soon as said threshold is crossed.

Le fonctionnement du dispositif de sécurité qui vient d'être décrit est le suivant.The operation of the security device which has just been described is as follows.

Tant que le seuil ci-dessus n'est pas franchi par le paramètre considéré, le transistor 16 est conduc­teur, sa résistance interne est très faible et sa pré­sence dans le circuit 11 n'affecte pratiquement pas l'intensité du courant i lorsque ce courant est engendré par le thermocouple 12.As long as the above threshold is not crossed by the parameter considered, the transistor 16 is conductive, its internal resistance is very low and its presence in the circuit 11 practically does not affect the intensity of the current i when this current is generated by thermocouple 12.

Dès l'armement du bouchon magnétique, obtenu par appui manuel (flèche A) sur un bouton 18 prévu à l'ex­trémité, de la tige 7, opposée à la palette 8, le gaz traverse la vanne 3 et parvient à la veilleuse 13, la­quelle s'allume, notamment du fait de la production d'étincelles à partir d'un allumeur piézoélectrique ou autre.As soon as the magnetic plug is cocked, obtained by manual pressing (arrow A) on a button 18 provided at the end of the rod 7, opposite the vane 8, the gas passes through the valve 3 and reaches the pilot 13, which ignites, in particular due to the production of sparks from a piezoelectric igniter or the like.

Le courant i est alors engendré dans le circuit 11 et la force F qui en résulte l'emporte légèrement sur la force de rappel R du ressort 15, de sorte que la vanne 3 est maintenue en sa position armée d'ouverture, même lorsque la pression d'armement sur le bouton 18 cesse ; de même la veilleuse 13 reste alors allumée.The current i is then generated in the circuit 11 and the resulting force F slightly outweighs the restoring force R of the spring 15, so that the valve 3 is maintained in its armed opening position, even when the arming pressure on button 18 ceases; similarly the pilot light 13 then remains lit

Le brûleur 1 s'allume alors automatiquement dès que le clapet-gaz 4 est ouvert, cette ouverture étant commandée par exemple par un puisage d'eau chaude sani­taire dans le cas d'un chauffe-eau ou chauffe-bains.Burner 1 then ignites automatically as soon as that the gas valve 4 is open, this opening being controlled for example by drawing domestic hot water in the case of a water heater or bath heater.

Le brûleur 1 s'éteint ensuite dès la fermeture dudit clapet-gaz 4.The burner 1 then goes out as soon as said gas valve 4 is closed.

Si la veilleuse 13 s'éteint, par exemple à la suite d'un coup de vent ou d'un refoulement d'air, le thermocouple 12 n'est plus chauffé, le courant i engen­dré par chauffage de ce thermocouple s'annule et il en est de même de la force F : la force de rappel R du ressort 15 ferme alors la vanne 3 en appliquant le cla­pet 5 contre son siège 6.If the pilot light 13 goes out, for example following a gale or an air discharge, the thermocouple 12 is no longer heated, the current i generated by heating this thermocouple is canceled and the same applies to the force F: the return force R of the spring 15 then closes the valve 3 by applying the valve 5 against its seat 6.

C'est un effet analogue qui est produit dès que le seuil ci-dessus défini est franchi par le paramètre auquel est asservie la sécurité.It is an analogous effect which is produced as soon as the threshold defined above is crossed by the parameter to which the safety is subject.

En effet ce franchissement, détecté en 17, se traduit par l'annulation de la tension appliquée sur la base du transistor 16, ce qui donne immédiatement à la résistance interne de ce transistor une valeur beaucoup plus élevée que celle de la bobine 10 : le courant i n'est plus alors suffisant pour engendrer la force F et l'équilibre préalablement établi entre cette force F et la force de rappel R est rompu en faveur de la seconde, ce qui entraîne la fermeture de la vanne 3.Indeed, this crossing, detected at 17, results in the cancellation of the voltage applied to the base of transistor 16, which immediately gives the internal resistance of this transistor a value much higher than that of coil 10: the current i is no longer sufficient to generate the force F and the balance previously established between this force F and the return force R is broken in favor of the second, which causes the valve 3 to close.

En suite de quoi, et quel que soit le mode de réalisation adopté, on obtient finalement un dispositif de sécurité pour vanne à gaz dont la constitution et le fonctionnement résultent suffisamment de ce qui précède.Following which, and whatever the embodiment adopted, a safety device for a gas valve is finally obtained, the constitution and operation of which result sufficiently from the above.

Ce dispositif présente un certain nombre d'avan­tages par rapport à ceux antérieurement connus, en par­ticulier en ce qui concerne la fiabilité et la longévité du contact de sécurité 16 du fait que celui-ci est réalisé par des éléments semi-conducteurs statiques beaucoup moins vulnérables que les contacts mécaniques à éléments mobiles.This device has a certain number of advantages compared to those previously known, in particular with regard to the reliability and the longevity of the safety contact 16 because it is produced by static semiconductor elements which are much less vulnerable. as mechanical contacts with moving parts.

Comme il va de soi, et comme il résulte d'ail­leurs déjà de ce qui précède, l'invention ne se limite nullement à ceux de ses modes d'application et de réali­sation qui ont été plus spécialement envisagés ; elle en embrasse, au contraire, toutes les variantes.As is obvious, and as already follows from the foregoing, the invention is in no way limited to those of its modes of application and embodiments which have been more especially envisaged; on the contrary, it embraces all its variants.

Claims (2)

1. Dispositif de sécurité associé à la vanne d'alimentation (3) en gaz combustible du brûleur (1) d'un appareil de chauffage équipé d'une veilleuse (13), ladite vanne comprenant un clapet (5) susceptible d'être armé à la main en sa position d'ouverture, ce clapet étant associé à une bobine électromagnétique (10) de fa­çon telle que le maintien en position ouverte armée du clapet soit assuré par circulation dans la bobine du courant électrique engendré par le simple chauffage d'un thermocouple (12) par la veilleuse, la sécurité recher­chée étant obtenue par ouverture d'un interrupteur élec­trique (16) monté sur le circuit qui relie le thermo­couple à la bobine, caractérisé en ce que l'interrupteur électrique (16) est constitué par un transistor de type MOS présentant une très faible résistance drain-source à l'état conducteur.1. Safety device associated with the fuel gas supply valve (3) of the burner (1) of a heating appliance equipped with a pilot light (13), said valve comprising a valve (5) capable of being armed by hand in its open position, this valve being associated with an electromagnetic coil (10) in such a way that the maintenance in the open armed position of the valve is ensured by circulation in the coil of the electric current generated by the simple heating of '' a thermocouple (12) by the pilot light, the desired security being obtained by opening an electric switch (16) mounted on the circuit which connects the thermocouple to the coil, characterized in that the electric switch (16) consists by a MOS type transistor having a very low drain-source resistance in the conductive state. 2. Dispositif de sécurité selon la revendication 1, caractérisé en ce que la résistance drain-source à l'état conducteur du transistor (16) est inférieure à 30 mΩ.2. Safety device according to claim 1, characterized in that the drain-source resistance in the conductive state of the transistor (16) is less than 30 mΩ.
EP88400980A 1987-04-24 1988-04-21 Security apparatus for gas valves Withdrawn EP0288390A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8705823 1987-04-24
FR8705823A FR2614385B1 (en) 1987-04-24 1987-04-24 IMPROVEMENTS TO SAFETY DEVICES FOR GAS VALVES

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EP0288390A1 true EP0288390A1 (en) 1988-10-26

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EP88400980A Withdrawn EP0288390A1 (en) 1987-04-24 1988-04-21 Security apparatus for gas valves

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EP (1) EP0288390A1 (en)
FR (1) FR2614385B1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0643266A1 (en) * 1993-09-14 1995-03-15 ELECTROLUX SIEGEN GmbH Thermocouple current switch
ES2082669A1 (en) * 1991-07-12 1996-03-16 Teka Ind Sa Device for actuating a gas tap, with ignition safety device and remote control
WO2002040923A1 (en) * 2000-11-16 2002-05-23 Fernando Teodoro Garcia Shut-off safety system and gas appliance including same
EP1236941A2 (en) * 2001-02-16 2002-09-04 HeaTec Thermotechnik GmbH Gas valve
EP1420206A1 (en) * 2002-11-13 2004-05-19 FAGOR, S.Coop Combustion detection apparatus with a thermoelectric generator
AU2002214834B2 (en) * 2000-11-16 2006-11-16 Fernando Teodoro Garcia Shut-off safety system and gas appliance including same
EP1739351A1 (en) * 2005-06-30 2007-01-03 Orkli S. Coop. Safety valve power supply circuit for the ignition of a gas burner
NL2004917C2 (en) * 2010-06-18 2011-12-20 Intell Properties B V Device and method for electrically controlled turning off of a gas flame of a gas hob.
EP3839352A1 (en) 2019-12-19 2021-06-23 Orkli, S. Coop. Thermoelectric assembly for powering a plurality of electromagnetic valves of a cooking appliance
EP3839346A1 (en) 2019-12-19 2021-06-23 Orkli, S. Coop. Thermoelectric assembly for powering a plurality of electromagnetic valves of a cooking appliance
EP3848632A1 (en) 2020-01-08 2021-07-14 Orkli, S. Coop. Thermoelectric safety device for the absence of a flame in gas combustion systems

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565519A (en) * 1983-01-21 1986-01-21 Advanced Mechanical Technology, Inc. Burner ignition system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565519A (en) * 1983-01-21 1986-01-21 Advanced Mechanical Technology, Inc. Burner ignition system

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2082669A1 (en) * 1991-07-12 1996-03-16 Teka Ind Sa Device for actuating a gas tap, with ignition safety device and remote control
EP0643266A1 (en) * 1993-09-14 1995-03-15 ELECTROLUX SIEGEN GmbH Thermocouple current switch
AU2002214834B2 (en) * 2000-11-16 2006-11-16 Fernando Teodoro Garcia Shut-off safety system and gas appliance including same
WO2002040923A1 (en) * 2000-11-16 2002-05-23 Fernando Teodoro Garcia Shut-off safety system and gas appliance including same
EP1236941A2 (en) * 2001-02-16 2002-09-04 HeaTec Thermotechnik GmbH Gas valve
EP1236941A3 (en) * 2001-02-16 2003-04-23 HeaTec Thermotechnik GmbH Gas valve
EP1420206A1 (en) * 2002-11-13 2004-05-19 FAGOR, S.Coop Combustion detection apparatus with a thermoelectric generator
EP1739351A1 (en) * 2005-06-30 2007-01-03 Orkli S. Coop. Safety valve power supply circuit for the ignition of a gas burner
NL2004917C2 (en) * 2010-06-18 2011-12-20 Intell Properties B V Device and method for electrically controlled turning off of a gas flame of a gas hob.
EP3839352A1 (en) 2019-12-19 2021-06-23 Orkli, S. Coop. Thermoelectric assembly for powering a plurality of electromagnetic valves of a cooking appliance
EP3839346A1 (en) 2019-12-19 2021-06-23 Orkli, S. Coop. Thermoelectric assembly for powering a plurality of electromagnetic valves of a cooking appliance
EP3848632A1 (en) 2020-01-08 2021-07-14 Orkli, S. Coop. Thermoelectric safety device for the absence of a flame in gas combustion systems
WO2021140266A1 (en) 2020-01-08 2021-07-15 Orkli, S.Coop. Device for thermoelectric safety in the absence of a flame for gas combustion systems

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FR2614385A1 (en) 1988-10-28
FR2614385B1 (en) 1989-07-28

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