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EP0021937B1 - Electromagnetic safety mechanism - Google Patents

Electromagnetic safety mechanism Download PDF

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Publication number
EP0021937B1
EP0021937B1 EP19800400825 EP80400825A EP0021937B1 EP 0021937 B1 EP0021937 B1 EP 0021937B1 EP 19800400825 EP19800400825 EP 19800400825 EP 80400825 A EP80400825 A EP 80400825A EP 0021937 B1 EP0021937 B1 EP 0021937B1
Authority
EP
European Patent Office
Prior art keywords
armature
core
rod
magnetic
turns
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
Application number
EP19800400825
Other languages
German (de)
French (fr)
Other versions
EP0021937A1 (en
Inventor
Jean-Marie Nisot
Georges Berenfeld
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.)
Saunier Duval Eau Chaude Chauffage SDECC SA
Original Assignee
Saunier Duval Eau Chaude Chauffage SDECC SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saunier Duval Eau Chaude Chauffage SDECC SA filed Critical Saunier Duval Eau Chaude Chauffage SDECC SA
Publication of EP0021937A1 publication Critical patent/EP0021937A1/en
Application granted granted Critical
Publication of EP0021937B1 publication Critical patent/EP0021937B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q9/00—Pilot flame igniters
    • F23Q9/08—Pilot flame igniters with interlock with main fuel supply
    • F23Q9/12—Pilot flame igniters with interlock with main fuel supply to permit the supply to the main burner in dependence upon existence of pilot flame
    • F23Q9/14—Pilot flame igniters with interlock with main fuel supply to permit the supply to the main burner in dependence upon existence of pilot flame using electric means, e.g. by light-sensitive elements
    • 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
    • F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves

Definitions

  • the invention relates to a magnet cartridge for a thermoelectric ignition safety device.
  • thermoelectric ignition safety devices which are used to cut off the supply of gas to an appliance in the event of the extinction of a burner or pilot flame, include, as we know, a two-pole electromagnet or magnetic core as well that an armature plate mounted at one end of a rod whose other end carries either a valve or a cup depending on whether the mechanism is intended to shut off a gas flow directly or via levers.
  • a protective cap made of non-magnetizable metal (such as brass) or plastic.
  • the magnetic core is rigidly fixed to a plate.
  • the armature is fixed on the rod with a certain clearance allowing it to articulate with respect to the two poles of the magnetic core during the operating movements of the gas appliance in which the electromagnetic safety device is incorporated.
  • This frame is generally formed by a single thin plate.
  • the armature and the movable member are independent with respect to each other and as a function of the magnetic flux of the electromagnet, said movable member moves on the valve stem and actuates a contact.
  • the object of the invention is therefore to modify the air gap in order to increase or decrease the consumption of ampere-turns in order to obtain different switching and tripping currents.
  • the armature fixed to the end of the control rod of a valve and / or the two branches of the core are each made in two adjoining parts which are inseparable from each other, made of magnetic material , and superimposed to form an air gap between them.
  • the safety mechanism as shown generally comprises a magnetic core 2, an armature, generally designated by the reference 1, mounted at one end of the rod 3, and at the opposite end of this rod, a valve 4 for the direct closure of a gas flow.
  • This valve can be replaced by a cup if the mechanism has to act on a shutter member by means of levers.
  • the core 2 is rigidly fixed by a rivet or by a contact rivet 5 on the seat 6.
  • This contact rivet is crossed by the end wire 7 of the excitation winding 8 of the core 2.
  • a protective cap 9 covers the core 2 and its frame 1.
  • a return spring 10 bearing on the cap covers the rod 3 and acts on the valve 4.
  • the magnetic core 2 is formed of two branches 20 and 21 each made in two parts 20a and 21a for the formation of an additional air gap.
  • the frame 1 is made up of two small pieces of magnetic material 1a and 1b superimposed and of small thickness. These two plates are either free or fixed to each other by any mechanical means, for example by crimping with a slight tightening, by gluing or by spot welding, and are each pierced with a central orifice 11, the diameter is slightly greater than the diameter of the end 12 of the rod 3.
  • the end 12 of the rod 3 is crimped onto the lower plate 1a of the armature 1 so that there remains a clearance allowing the armature to articulate with respect to the two poles of the core 2, this is that is to say that the armature can be applied perfectly on these poles by compensating for any misalignment of the normal rod to the magnetic core.
  • an elastic O-ring 14 which is slightly crushed at the moment is interposed between the rear of the plate 1b and the metallic circular washer 13 coaxial with the rod. of the crimping of the rod.
  • the lower plate 1a When the armature 1 is held against the core 2, the lower plate 1a is traversed by a constant and limited magnetic flux, depending on its thickness. Since said plate becomes saturated very quickly and offers a very high magnetic reluctance, part of the flux is forced to pass on the one hand to the air gap located between the two plates 1a and 1 of the frame 1 and on the other hand the air gap formed on the two branches 20 and 21 of the core 2, which results in a significant increase in the ampere-turns consumed, and consequently of the interlocking and tripping currents.
  • This increase is a function of the thicknesses chosen for the plates 1a and 1b of the reinforcement, their surface condition and the type of material used. In fact, depending on the interlocking and tripping currents that it is desired to obtain, it is possible to increase or decrease the thickness of the plates making up the frame, to use plates of different thicknesses, or else different surface states. It is also possible to use only the air gap formed between the two plates of the frame or only the air gap formed on the branches of the magnetic core.
  • This embodiment therefore makes it possible to vary the consumption of ampere-turns in order to obtain engagement and tripping currents suitable for all uses.
  • the invention is not limited to the illustrated embodiment but also encompasses the constructive variants.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnets (AREA)

Description

L'invention se rapporte à une cartouche à aimant pour un dispositif de sécurité d'allumage thermoélectrique.The invention relates to a magnet cartridge for a thermoelectric ignition safety device.

Les dispositifs bien connus de sécurité d'allumage thermoélectrique qui servent à couper l'amenée du gaz à un appareil en cas d'extinction d'une flamme de brûleur ou de veilleuse, comportent comme on sait un électroaimant ou noyau magnétique à deux pôles ainsi qu'une plaque d'armature montée à une extrémité d'une tige dont l'autre extrémité porte soit une soupape soit une coupelle selon que le mécanisme est destiné à obturer un écoulement de gaz directement ou par l'intermédiaire de leviers. Pour protéger le noyau magnétique et l'armature coopérant avec lui, on les entoure d'un capuchon de protection en métal non aimantable (tel que du laiton) ou en matière plastique.The well-known thermoelectric ignition safety devices which are used to cut off the supply of gas to an appliance in the event of the extinction of a burner or pilot flame, include, as we know, a two-pole electromagnet or magnetic core as well that an armature plate mounted at one end of a rod whose other end carries either a valve or a cup depending on whether the mechanism is intended to shut off a gas flow directly or via levers. To protect the magnetic core and the armature cooperating with it, they are surrounded by a protective cap made of non-magnetizable metal (such as brass) or plastic.

Dans ces dispositifs connus le noyau magnétique est fixé d'une manière rigide sur une assiette. Par contre l'armature est fixée sur la tige avec un certain jeu lui permettant de s'articuler par rapport aux deux pôles du noyau magnétique lors des mouvements de fonctionnement de l'appareil à gaz dans lequel le dispositif de sécurité électromagnétique est incorporé. Cette armature est généralement formée par une plaque unique de faible épaisseur.In these known devices the magnetic core is rigidly fixed to a plate. On the other hand, the armature is fixed on the rod with a certain clearance allowing it to articulate with respect to the two poles of the magnetic core during the operating movements of the gas appliance in which the electromagnetic safety device is incorporated. This frame is generally formed by a single thin plate.

Lors de l'allumage de la veilleuse de sécurité de l'appareil, une action mécanique extérieure sur la soupape gaz provoque la descente de l'armature mobile et la fermeture du circuit magnétique constitué par le noyau et ladite armature. Le maintien dans cette position malgré l'action d'un ressort de rappel est assuré par les ampères-tours circulant dans les spires du bobinage. Les ampères-tours sont donc consommés par le matériau magnétique et par l'entrefer placé entre le noyau et l'armature.When the safety pilot of the appliance is lit, an external mechanical action on the gas valve causes the movable armature to descend and the magnetic circuit formed by the core and said armature to close. Maintaining in this position despite the action of a return spring is ensured by the amp-turns circulating in the turns of the winding. The ampere-turns are therefore consumed by the magnetic material and by the air gap placed between the core and the armature.

Lors d'une diminution du courant circulant dans les spires du bobinage, les ampères-tours, à partir d'une certaine valeur du courant, ne sont plus suffisants sous l'effet du ressort pour maintenir l'armature collée contre le noyau.When the current flowing in the windings of the winding decreases, the ampere-turns, from a certain value of the current, are no longer sufficient under the effect of the spring to keep the armature glued against the core.

On connait dans le US-A. 2.881.830 un mécanisme de sécurité électromagnétique dans lequel l'armature reliée à une soupape par une tige coopère avec un noyau mobile en matériau magnétique.We know in the US-A. 2,881,830 an electromagnetic safety mechanism in which the armature connected to a valve by a rod cooperates with a movable core of magnetic material.

L'armature et l'organe mobile sont indépendants l'un par rapport à l'autre et en fonction du flux magnétique de l'électroaimant ledit organe mobile se déplace sur la tige de soupape et actionne un contact.The armature and the movable member are independent with respect to each other and as a function of the magnetic flux of the electromagnet, said movable member moves on the valve stem and actuates a contact.

Il existe donc dans ces mécanismes connus un courant d'enclenchement et de déclenchement dont les valeurs dépendent :

  • - du cycle d'hystérésis que le matériau par- cou rt,
  • - de la valeur du ressort de rappel de la soupape,
  • - du nombre de spires du bobinage,
  • - et surtout de la grandeur de l'entrefer.
In these known mechanisms, therefore, there is an on and off current, the values of which depend on:
  • - of the hysteresis cycle that the material passes through,
  • - the value of the valve return spring,
  • - the number of winding turns,
  • - and above all the size of the air gap.

Par conséquent, on sait que les courants d'enclenchement et de déclenchement sont considérablement augmentés à partir du moment où l'entrefer augmente de façon notable car, dans l'air, la circulation du flux magnétique exige une consommation très importante d'ampères-tours.Consequently, it is known that the switching on and off currents are considerably increased from the moment when the air gap increases significantly because, in the air, the circulation of the magnetic flux requires a very high consumption of amperes- turns.

Le but de l'invention est donc de modifier l'entrefer pour augmenter ou diminuer la consommation d'ampères-tours afin d'obtenir des courants d'enclenchement et de déclenchement différents.The object of the invention is therefore to modify the air gap in order to increase or decrease the consumption of ampere-turns in order to obtain different switching and tripping currents.

Suivant l'invention, l'armature fixée à l'extrémité de la tige de commande d'une soupape et/ou les deux branches du noyau sont réalisées chacune en deux parties accolées et inséparables l'une de l'autre, en matériau magnétique, et superposées pour former entre elles un entrefer.According to the invention, the armature fixed to the end of the control rod of a valve and / or the two branches of the core are each made in two adjoining parts which are inseparable from each other, made of magnetic material , and superimposed to form an air gap between them.

D'autres caractéristiques particulières et avantages de l'invention ressortiront de la description qui va suivre en référence au dessin annexé qui représente une vue en coupe du mécanisme de sécurité.Other particular characteristics and advantages of the invention will emerge from the description which follows with reference to the appended drawing which represents a sectional view of the safety mechanism.

Le mécanisme de sécurité tel que représenté comporte de façon générale un noyau magnétique 2, une armature, désignée dans son ensemble par la référence 1, montée à une extrémité de la tige 3, et à l'extrémité opposée de cette tige, une soupape 4 pour l'obturation directe d'un écoulement de gaz. Cette soupape peut être remplacée par une coupelle si le mécanisme doit agir sur un organe obturateur par l'intermédiaire de leviers. Le noyau 2 est fixé d'une manière rigide par un rivet ou par un rivet contact 5 sur l'assise 6.The safety mechanism as shown generally comprises a magnetic core 2, an armature, generally designated by the reference 1, mounted at one end of the rod 3, and at the opposite end of this rod, a valve 4 for the direct closure of a gas flow. This valve can be replaced by a cup if the mechanism has to act on a shutter member by means of levers. The core 2 is rigidly fixed by a rivet or by a contact rivet 5 on the seat 6.

Ce rivet contact est traversé par le fil d'extrémité 7 de l'enroulement d'excitation 8 du noyau 2. Un capuchon de protection 9 coiffe le noyau 2 et son armature 1. Un ressort de rappel 10 prenant appui sur le capuchon coiffe la tige 3 et agit sur le clapet 4.This contact rivet is crossed by the end wire 7 of the excitation winding 8 of the core 2. A protective cap 9 covers the core 2 and its frame 1. A return spring 10 bearing on the cap covers the rod 3 and acts on the valve 4.

Le noyau magnétique 2 est formé de deux branches 20 et 21 réalisées chacune en deux parties 20a et 21a pour la formation d'un entrefer supplémentaire.The magnetic core 2 is formed of two branches 20 and 21 each made in two parts 20a and 21a for the formation of an additional air gap.

L'armature 1 se compose de deux petites pia- ques en matériau magnétique 1a et 1b superposées et de faible épaisseur. Ces deux plaques sont soit libres, soit fixées l'une sur l'autre par un moyen mécanique quelconque par exemple par sertissage avec un léger serrage, par collage ou par soudure par point, et sont percées chacune d'un orifice central 11 dont le diamètre est légèrement supérieur au diamètre de l'extrémité 12 de la tige 3.The frame 1 is made up of two small pieces of magnetic material 1a and 1b superimposed and of small thickness. These two plates are either free or fixed to each other by any mechanical means, for example by crimping with a slight tightening, by gluing or by spot welding, and are each pierced with a central orifice 11, the diameter is slightly greater than the diameter of the end 12 of the rod 3.

L'extrémité 12 de la tige 3 est sertie sur la plaque inférieure 1a de l'armature 1 de telle sorte qu'il subsiste un jeu permettant à l'armature de s'articuler par rapport aux deux pôles du noyau 2, c'est-à-dire que l'armature peut s'appliquer parfaitement sur ces pôles en compensant les éventuels défauts d'alignement de la tige normalement au noyau magnétique. Pour éviter la rotation de l'armature 1 par rapport à la tige 3, on interpose entre l'arrière de la plaque 1 b et la rondelle circulaire métallique 13 coaxiale à la tige, un joint torique élastique 14 qui se trouve légèrement écrasé au moment du sertissage de la tige.The end 12 of the rod 3 is crimped onto the lower plate 1a of the armature 1 so that there remains a clearance allowing the armature to articulate with respect to the two poles of the core 2, this is that is to say that the armature can be applied perfectly on these poles by compensating for any misalignment of the normal rod to the magnetic core. To avoid rotation of the armature 1 relative to the rod 3, an elastic O-ring 14 which is slightly crushed at the moment is interposed between the rear of the plate 1b and the metallic circular washer 13 coaxial with the rod. of the crimping of the rod.

Lorsqu'un élément sensible tel qu'un thermocouple non représenté, détecte la présence d'une flamme, il alimente, par l'intermédiaire du rivet contact 5, l'enroulement d'excitation 8. Les ampères-tours ainsi créés permettent la circulation d'un flux magnétique qui engendrera une force portante nécessaire au maintien de l'armature mobile 1 sur le noyau 2. Le courant minimum nécessaire au maintien de ladite armature s'appelle «courant d'enclenchement ».When a sensitive element such as a thermocouple not shown, detects the presence of a flame, it supplies, via the contact rivet 5, the excitation winding 8. The ampere-turns thus created allow circulation of a magnetic flux which will generate a bearing force necessary to maintain the movable armature 1 on the core 2. The minimum current necessary to maintain said armature is called "interlocking current".

Dès que la valeur de ce courant est atteinte, une action mécanique extérieure sur la soupape 4 provoque la descente de l'armature 1 et son collage sur le noyau 2..As soon as the value of this current is reached, an external mechanical action on the valve 4 causes the armature 1 to descend and stick to the core 2.

Lorsqu'une diminution du courant circulant dans l'enroulement d'excitation 8 est provoquée par exemple quand le thermocouple n'est plus chauffé, la force portante diminue et, à une certaine valeur de ce courant, la force de rappel du ressort 10 devient plus grande que la force portante, si bien que l'armature 1 décolle du noyau 2 et le ressort de rappel 10 provoque une action mécanique vers la mise en sécurité-gaz. Il existe donc un courant d'enclenchement et de déclenchement dont les valeurs dépendent des ampères-tours concommés.When a reduction in the current flowing in the excitation winding 8 is caused for example when the thermocouple is no longer heated, the bearing force decreases and, at a certain value of this current, the restoring force of the spring 10 becomes greater than the bearing force, so that the armature 1 takes off from the core 2 and the return spring 10 causes a mechanical action towards the gas safety device. There is therefore an on and off current, the values of which depend on the ampere-turns involved.

Quand l'armature 1 est maintenue contre le noyau 2, la plaque inférieure 1a est parcourue par un flux magnétique constant et limité, dépendant de son épaisseur. Etant donné que ladite plaque se sature très rapidement et offre une réluctance magnétique très importante, une partie du flux est contrainte de traverser d'une part l'entrefer situé entre les deux plaques la et 1 de l'armature 1 et d'autre part l'entrefer formé sur les deux branches 20 et 21 du noyau 2 ce qui entraine une augmentation sensible des ampères-tours consommés, et par conséquent des courants d'enclenchement et de déclenchement.When the armature 1 is held against the core 2, the lower plate 1a is traversed by a constant and limited magnetic flux, depending on its thickness. Since said plate becomes saturated very quickly and offers a very high magnetic reluctance, part of the flux is forced to pass on the one hand to the air gap located between the two plates 1a and 1 of the frame 1 and on the other hand the air gap formed on the two branches 20 and 21 of the core 2, which results in a significant increase in the ampere-turns consumed, and consequently of the interlocking and tripping currents.

Cette augmentation est fonction des épaisseurs choisies pour les plaques 1a et 1b de l'armature, de leur état de surface et du type de matériau utilisé. En effet, suivant les courants d'enclenchement et de déclenchement que l'on désire obtenir, il est possible d'augmenter ou de diminuer l'épaisseur des plaques composant l'armature, d'utiliser des plaques d'épaisseurs différentes, ou bien des états de surface différents. Il est également possible d'utiliser seulement l'entrefer formé entre les deux plaques de l'armature ou seulement l'entrefer réalisé sur les branches du noyau magnétique.This increase is a function of the thicknesses chosen for the plates 1a and 1b of the reinforcement, their surface condition and the type of material used. In fact, depending on the interlocking and tripping currents that it is desired to obtain, it is possible to increase or decrease the thickness of the plates making up the frame, to use plates of different thicknesses, or else different surface states. It is also possible to use only the air gap formed between the two plates of the frame or only the air gap formed on the branches of the magnetic core.

Cette réalisation permet donc de varier la consommation d'ampères-tours pour obtenir des courants d'enclenchement et de déclenchement aptes à toutes utilisations.This embodiment therefore makes it possible to vary the consumption of ampere-turns in order to obtain engagement and tripping currents suitable for all uses.

L'invention ne se limite pas à la forme de réalisation illustrée mais en englobe également les variantes constructives.The invention is not limited to the illustrated embodiment but also encompasses the constructive variants.

Claims (3)

1. Electromagnetic safety mechanism comprising a magnetic circuit formed by a core and an armature held on the end of a valve control rod characterised by the fact that the armature (1) and/or the two arms of the core (2) are each formed of two parts of magnetic material superposed to form between them a gap, and joined together and inseparable from one another.
2. Mechanism according to claim 1, characterised by the fact that the two inseparable parts of the armature, formed out of two different plates (1a) and (1b) are fixed to the same valve control rod (12) whose movement they follow.
3. Mechanism according to claim 2, characterised by the fact that the two plates (1 a) and (1 b) have a thickness and machining qualities which are the same or different.
EP19800400825 1979-06-13 1980-06-09 Electromagnetic safety mechanism Expired EP0021937B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7915094 1979-06-13
FR7915094A FR2458732A1 (en) 1979-06-13 1979-06-13 ELECTROMAGNETIC SAFETY MECHANISM

Publications (2)

Publication Number Publication Date
EP0021937A1 EP0021937A1 (en) 1981-01-07
EP0021937B1 true EP0021937B1 (en) 1983-03-09

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ID=9226530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800400825 Expired EP0021937B1 (en) 1979-06-13 1980-06-09 Electromagnetic safety mechanism

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EP (1) EP0021937B1 (en)
DE (1) DE3062267D1 (en)
FR (1) FR2458732A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109539260A (en) * 2018-11-22 2019-03-29 宁波好点烟具有限公司 A kind of multifunctional spraying firelock
CN109539259A (en) * 2018-11-22 2019-03-29 宁波好点烟具有限公司 A kind of flame gun put out a fire

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103712246B (en) * 2013-12-26 2015-12-30 潘兆铿 A kind of auto extinguishing protective device of household gas range
CN111878616B (en) * 2020-08-03 2021-11-05 宁波方太厨具有限公司 Kitchen range valve body

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2268960A (en) * 1940-04-15 1942-01-06 William A Ray Fluid control valve and electromagnetic operator therefor
US2881830A (en) * 1954-04-05 1959-04-14 Baso Inc Electromagnetic control system
DE1223979B (en) * 1961-04-08 1966-09-01 Kromschroeder Ag G Thermoelectrically controlled semi-automatic safety valve for two or more burning points

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109539260A (en) * 2018-11-22 2019-03-29 宁波好点烟具有限公司 A kind of multifunctional spraying firelock
CN109539259A (en) * 2018-11-22 2019-03-29 宁波好点烟具有限公司 A kind of flame gun put out a fire
CN109539259B (en) * 2018-11-22 2021-11-09 宁波好点烟具有限公司 Flame gun capable of extinguishing fire
CN109539260B (en) * 2018-11-22 2021-11-09 宁波好点烟具有限公司 Multifunctional flame gun

Also Published As

Publication number Publication date
FR2458732A1 (en) 1981-01-02
DE3062267D1 (en) 1983-04-14
FR2458732B3 (en) 1982-04-09
EP0021937A1 (en) 1981-01-07

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