EP0054504A1 - Piezoelectric ignition system for a safety gas burner and apparatuses, in particular absorption refrigerators, using such a system - Google Patents

Piezoelectric ignition system for a safety gas burner and apparatuses, in particular absorption refrigerators, using such a system Download PDF

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Publication number
EP0054504A1
EP0054504A1 EP19810420183 EP81420183A EP0054504A1 EP 0054504 A1 EP0054504 A1 EP 0054504A1 EP 19810420183 EP19810420183 EP 19810420183 EP 81420183 A EP81420183 A EP 81420183A EP 0054504 A1 EP0054504 A1 EP 0054504A1
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EP
European Patent Office
Prior art keywords
safety valve
pusher
piezoelectric mechanism
piezoelectric
actuating means
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EP19810420183
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German (de)
French (fr)
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EP0054504B1 (en
Inventor
Gérard Scremin
Nino Urbano
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Application des Gaz SA
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Application des Gaz SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q3/00—Igniters using electrically-produced sparks
    • F23Q3/002—Igniters using electrically-produced sparks using piezoelectric elements

Definitions

  • the present invention relates to a gas burner ignition system, combining on the one hand a temperature sensitive safety valve and on the other hand a piezoelectric mechanism.
  • a gas burner ignition system combining on the one hand a temperature sensitive safety valve and on the other hand a piezoelectric mechanism.
  • Such systems can be used on various gas appliances, such as water heaters, heating stoves, absorption refrigerators
  • thermo-sensitive safety valve in the sense of the present invention, it is necessary to understand a valve with inlet (connected to a gas source), and outlet (connected directly or indirectly to a burner), comprising within it a thermo element -sensitive (itself connected to a sensor arranged so as to be in contact with the burner flame), as well as an elastically charged pusher, making it possible to open the valve at least partially, in the absence of excitation of the thermosensitive element; when the burner is operating, it is the heat-sensitive element which keeps the valve open, the pusher then being released to return to its initial position, under the effect of its elastic load; when the burner stops working, the temperature-sensitive element no longer acts, which leads to the automatic closing of the valve.
  • the thermosensitive element and the sensor consist respectively of an electromagnet and a thermoelectric couple.
  • piezoelectric mechanism within the meaning of the present invention, it is necessary to understand a compact system, with electrical outlet (connected to an electrode arranged so as to ignite by sparks the gaseous mixture leaving the burner, the rest of the mechanism being at the mass), comprising within it a piezoelectric ceramic, as well as an elastically charged thrust member making it possible, from the start or during its stroke, to generate by action on the piezoelectric ceramic a high electric voltage (which generates at least one spark between the electrode and the burner); when the thrust member is released, it returns to its initial position, under the effect of its elastic load.
  • Such mechanisms can be single-spark (percussion) or multi-spark (compression).
  • This solution leads to placing the safety valve and the piezoelectric mechanism in a fixed manner relative to each other, and to providing a relatively complex actuation means, both in its construction and in its operation to act. successively on the safety valve and on the piezoelectric mechanism.
  • This complexity can in certain cases hamper the normal operation of the safety valve, for example by preventing the return of the pusher to its rest position, which is obviously not desirable in the event of the burner going out.
  • the actuating means is integral with the pushing member of the piezoelectric mechanism, which by its part opposite to said pushing member cooperates with the pusher. of the safety valve, and on the other hand the force required to actuate the piezoelectric mechanism is greater than the force necessary to at least partially open the safety valve by means of the pusher.
  • actuation means integral with the pushing member of the piezoelectric mechanism
  • the actuation means push button for example
  • the same means is distinct from the same member and connected to the latter, for example in rotation, the actuating means being capable of rotating relative to the thrust member of the piezoelectric mechanism.
  • force necessary for actuating the piezoelectric mechanism is meant the value of the thrust from which the piezoelectric mechanism is actuated or triggered, and therefore at least one electric shock is produced.
  • the thrust exerted on the thrust member increases with the displacement of the latter, in particular as a function of the deflection imposed on the elastic return load (spring in general) ; past a certain value of this thrust, the striker is' projected, under the effect of its own elastic load, against the piezoelectric ceramic, and it is this value which should be retained as being the force necessary for the actuation of the piezoelectric mechanism.
  • the safety valve By force necessary to at least partially open the safety valve means the value of the thrust exerted on the pusher, allowing at least partially to open said valve, and ensuring the passage of a gas flow at least sufficient for ignition of the burner, with which said valve communicates.
  • the thrust exerted on the pusher of the safety valve increases with the displacement of the latter, in particular as a function of the deflection imposed on the elastic return load (spring in general).
  • a security system in accordance with the invention brings together, behind and against each other, an actuating means 1, a piezoelectric mechanism 2, and a safety valve 3.
  • the safety valve is retained by two brackets 4 and 5, the vertical wing of which has an orifice adjusted to receive the body 6 of the safety valve.
  • the safety valve is blocked on the support constituted by the two brackets 4 and 5 is effected on the one hand by the shouldered nut 7 bearing against the bracket 5, and on the other hand by a ring of stop 8 forcibly mounted on the other side of the same bracket.
  • An intermediate part 9 encloses the piezoelectric mechanism, and the thrust member 10 belonging to the latter freely exits from this part.
  • the actuating means, or push button 1 is consisting of two parts 11 and 12 differently colored, nested one on the other.
  • the push button 1 is fixed to the pushing member 10 of the mechanism 2, by means of a screw 13 retaining the part 11 of the actuating means 1.
  • the rear part of the intermediate part 9, opposite to the the pushing member 10 is fixed to the pusher 14 of the safety valve 3, for example by means of a clip 15, which is received in two slots provided on the part 9 and a circular groove provided on the pusher 14.
  • An angle iron 16 having a flared orifice 17 serves as a guide for the push-button 1.
  • the piezoelectric mechanism comprises a housing 18, the thrust member 10, movable in translation, being capable of sinking into the housing.
  • a piezoelectric ceramic 19 is contained in the housing 18.
  • the displacement of the thrust member 10 in the housing 18 makes it possible both to load a return spring 20, and to project in translation a striker 21 against the ceramic 19 , under the effect of another spring 22, previously loaded during the same movement of the thrust member 10; the percussion is triggered when the lug 23 integral with the striker 21 escapes from its housing 24 provided on the housing 18, under the effect of the ramp 25 provided on the thrust member 10.
  • the return to the initial position of the thrust member 10 and striker 21 takes place under the sole effect of the return spring 20, the counter-ramp 26 provided on the member 10 bringing the lug 23 back into its housing 24.
  • the safety valve 3 comprises the tubular body 6, the end opposite the nut 7 is associated with the pusher 14, loaded elastically towards the outside by a compression spring 27.
  • the interior end of the pusher 14 has a rod 28 capable of acting on a valve 29 pushed against its seat 6a by means of another spring 30.
  • a heat-sensitive element 31, for example an electromagnet, keeps the valve 29 open if the sensor (not shown) ) connected to it by a wire 32, reaches a determined temperature.
  • the pusher 14 can be maintained in an intermediate position, thanks to the presence of balls 33 loaded centrifugally and cooperating with a chamfer 6b of the body.
  • the safety valve is provided with a gas inlet 34 (about) located upstream of the valve 29, and a gas outlet 35 located downstream of the valve.
  • the force necessary to open it at least partially by means of the pusher 14, that is to say the force necessary to move the valve 29 and reach between the latter and the seat a passage section sufficient to ignite the burner is approximately equal to the elastic load of the spring 27, plus the elastic load of the spring 30, when said sufficient passage section is reached. invention, it is this force which must remain less than the actuation force of the piezoelectric mechanism.
  • the invention applies to any gas burner appliance, in particular absorption refrigerators equipped with such a burner.

Abstract

1. Piezo-electric lighting system for a gas burner with safety device, comprising : - a thermo-sensitive safety shutter (3), with a resiliently mounted push-member (14), allowing the shutter to be opened when the burner is not lit ; - a piezo-electric mechanism (2) comprising a resiliently mounted pressure member (10) ; - a single actuating means (1), for actuating the push-member (1) of the safety shutter (3) and then the pressure member (10) of the piezo-electric mechanism (2), the re-setting of the actuating means (14) taking place under the sole effect of the resilience of the safety shutter (3) and the piezo-electric mechanism (2), characterized in that the actuating means (1) is integral with the pressure member (10) of the piezo-electric mechanism (2), the part of the latter opposed to the said pressure member (10) cooperating with the push-member (14) of the safety shutter (3), and in that the force necessary to actuate the piezo-electric mechanism (2) is greater than the force necessary to open at least partially the safety shutter (3), by means of the push-member (14).

Description

La présente invention concerne un système d'allumage d'un brûleur à gaz, associant d'une part une vanne de sécurité thermo-sensible et d'autre part un mécanisme piézo-électrique. De tels systèmes, bien connus dans la pratique, peuvent être utilisés sur différents appareils à gaz, tels que chauffe-eau, réchauds de chauffage, réfrigérateurs à absorptionThe present invention relates to a gas burner ignition system, combining on the one hand a temperature sensitive safety valve and on the other hand a piezoelectric mechanism. Such systems, well known in the art, can be used on various gas appliances, such as water heaters, heating stoves, absorption refrigerators

Par vanne de sécurité thermo-sensible, au sens de la présente invention, il faut comprendre une vanne avec entrée (reliée à une source de gaz), et sortie (reliée directement ou indirectement à un brûleur), comprenant en son sein un élément thermo-sensible (lui-même relié à un capteur disposé de manière à être en contact avec la flamme du brûleur), ainsi qu'un poussoir chargé élastiquement, permettant d'ouvrir au moins partiellement la vanne, en l'absence d'excitation de l'élément thermo-sensible ; lorsque le brûleur fonctionnne, c'est l'élément thermo-sensible qui maintient la vanne ouverte, le poussoir étant alors relâché pour revenir à sa position initiale, sous l'effet de sa charge élastique ; lorsque le brûleur cesse de fonctionner, l'élément thermo-sensible n'agit plus ce qui entraîne la fermeture automatique de la vanne. Le plus souvent l'élément thermo-sensible et le capteur consistent respectivement en un électro-aimant et un couple thermo-électrique.By thermo-sensitive safety valve, in the sense of the present invention, it is necessary to understand a valve with inlet (connected to a gas source), and outlet (connected directly or indirectly to a burner), comprising within it a thermo element -sensitive (itself connected to a sensor arranged so as to be in contact with the burner flame), as well as an elastically charged pusher, making it possible to open the valve at least partially, in the absence of excitation of the thermosensitive element; when the burner is operating, it is the heat-sensitive element which keeps the valve open, the pusher then being released to return to its initial position, under the effect of its elastic load; when the burner stops working, the temperature-sensitive element no longer acts, which leads to the automatic closing of the valve. Most often the thermosensitive element and the sensor consist respectively of an electromagnet and a thermoelectric couple.

Par mécanisme piézo-électrique, au sens de la présente invention, il faut comprendre un système de faible encombrement, avec sortie électrique (reliée à une électrode disposée de manière à enflammer par étincelles le mélange gazeux sortant du brûleur, le reste du mécanisme étant à la masse), comprenant en son sein une céramique piézo-électrique, ainsi qu'un organe de poussée chargée élastiquement permettant, dès le début ou lors de sa course, de générer par action sur la céramique piézo-électrique une tension électrique élevée (laquelle engendre au moins une étincelle entre l'électrode et le brûleur) ; lorsqu'on relâche l'organe de poussée, celui-ci revient à sa position initiale, sous l'effet de sa charge élastique. De tels mécanismes peuvent être mono-étincelles (à percussion) ou multi-étincelles (à compression). Afin de simplifier le maniement des systèmes d'allumage envisagés par la présente invention, conformément à la demande de brevet français 78 28317 du 27/09/78 déposée par la Demanderesse, on a déjà proposé de rassembler la vanne de sécurité et le mécanisme piézo-électrique selon une disposition relative, par exemple alignement, dans laquelle un moyen unique d'actionnement permet d'agir, par exemple en translation, successivement sur le poussoir de la vanne de sécurité et sur l'organe de poussée du mécanisme piézo-électrique, le réarmement, ou retour à la position initiale du moyen unique d'actionnement, s'effectuant après relâchement sous le seul effet des charges élastiques ainsi libérées, disponibles dans la vanne de sécurité et le mécanisme piézo-électrique.By piezoelectric mechanism, within the meaning of the present invention, it is necessary to understand a compact system, with electrical outlet (connected to an electrode arranged so as to ignite by sparks the gaseous mixture leaving the burner, the rest of the mechanism being at the mass), comprising within it a piezoelectric ceramic, as well as an elastically charged thrust member making it possible, from the start or during its stroke, to generate by action on the piezoelectric ceramic a high electric voltage (which generates at least one spark between the electrode and the burner); when the thrust member is released, it returns to its initial position, under the effect of its elastic load. Such mechanisms can be single-spark (percussion) or multi-spark (compression). In order to simplify the handling of the ignition systems envisaged by the present invention, in accordance with French patent application 78 28317 of 09/27/78 filed by the Applicant, it has already been proposed to assemble the safety valve and the piezo mechanism -electric according to a relative arrangement, for example alignment, in which a single actuation means makes it possible to act, for example in translation, successively on the pusher of the safety valve and on the thrust member of the piezoelectric mechanism , the reset, or return to the initial position of the single actuating means, taking place after release under the sole effect of the elastic loads thus released, available in the safety valve and the piezoelectric mechanism.

Cette solution conduit à disposer la vanne de sécurité et le mécanisme piézo-électrique de manière fixe l'un par rapport à l'autre, et à prévoir un moyen d'actionnement relativement complexe, tant dans sa construction que dans son-fonctionnement pour agir successivement sur la vanne de sécurité et sur le mécanisme piézo-électrique. Cette complexité peut dans certains cas entraver le fonctionnement normal de la vanne de sécurité, par exemple en empêchant le retour du poussoir à sa position de repos, ce qui n'est évidemment pas souhaitable en cas d'extinction du brûleur.This solution leads to placing the safety valve and the piezoelectric mechanism in a fixed manner relative to each other, and to providing a relatively complex actuation means, both in its construction and in its operation to act. successively on the safety valve and on the piezoelectric mechanism. This complexity can in certain cases hamper the normal operation of the safety valve, for example by preventing the return of the pusher to its rest position, which is obviously not desirable in the event of the burner going out.

Tout ceci conduit à vouloir encore simplifier les systèmes d'allumage envisagés par la présente invention, de manière à les rendre aisément réalisables au plan industriel, et parfaitement fiables au plan de leur utilisation quotidienne, domestique par exemple. Tel est le problème technique que vise à résoudre la présente invention.All this leads to wanting to further simplify the ignition systems envisaged by the present invention, so as to make them easily achievable on an industrial level, and perfectly reliable in terms of their daily use, domestic for example. This is the technical problem which the present invention aims to solve.

Selon la présente invention, d'une part le moyen d'actionnement est solidaire de l'organe de poussée du mécanisme piézo-électrique, lequel par sa partie opposée audit organe de poussée coopère avec le poussoir.de la vanne de sécurité, et d'autre part la force nécessaire à l'actionnement du mécanisme piézo-électrique est supérieure à la force nécessaire pour ouvrir au moins partiellement la vanne de sécurité au moyen du poussoir.According to the present invention, on the one hand the actuating means is integral with the pushing member of the piezoelectric mechanism, which by its part opposite to said pushing member cooperates with the pusher. of the safety valve, and on the other hand the force required to actuate the piezoelectric mechanism is greater than the force necessary to at least partially open the safety valve by means of the pusher.

Par moyen d'actionnement solidaire de l'organe de poussée du mécanisme piézo-électrique, il faut comprendre que soit le moyen d'actionnement, bouton-poussoir par exemple, s'identifie avec l'organe de poussée en question, soit le même moyen est distinct du même organe et relié à ce dernier, par exemple en rotation, le moyen d'actionnement étant susceptible de tourner par rapport à l'organe de poussée du méc'anisme piézo-électrique.By actuation means integral with the pushing member of the piezoelectric mechanism, it should be understood that either the actuation means, push button for example, is identified with the pushing member in question, or the same means is distinct from the same member and connected to the latter, for example in rotation, the actuating means being capable of rotating relative to the thrust member of the piezoelectric mechanism.

Par coopération du mécanisme piézo-électrique avec le poussoir de la vanne de sécurité, il faut comprendre que la partie du mécanisme, opposée à l'organe de poussée agit sous l'effet du moyen d'actionnement, soit indirectement, par exemple grâce à un moyen mécanique intermédiaire transmettant au poussoir de la vanne la poussée exercée sur le mécanisme, soit directement, par exemple par appui contre le poussoir de la même vanne.By cooperation of the piezoelectric mechanism with the pusher of the safety valve, it should be understood that the part of the mechanism, opposite to the thrust member acts under the effect of the actuating means, either indirectly, for example thanks to an intermediate mechanical means transmitting to the valve tappet the thrust exerted on the mechanism, either directly, for example by pressing against the tappet of the same valve.

Par force nécessaire à l'actionnement du mécanisme piézo-électrique, on entend la valeur de la poussée à partir de laquelle on actionne ou déclenche le mécanisme piézo-électrique, et donc on produit au moins une décharge électrique. Ainsi dans le cas d'un mécanisme piézo-électrique à percussion, la poussée exercée sur.l'organe de poussée croît avec le déplacement de ce dernier, notamment en fonction de la flèche imposée à la charge élastique de rappel (ressort en général) ; passée une certaine valeur de cette poussée, le percuteur est' projeté, sous l'effet de sa propre charge élastique, contre la céramique piézo-électrique, et c'est cette valeur qu'il convient de retenir comme étant la force nécessaire à l'actionnement du mécanisme piézo-électrique.By force necessary for actuating the piezoelectric mechanism is meant the value of the thrust from which the piezoelectric mechanism is actuated or triggered, and therefore at least one electric shock is produced. Thus in the case of a piezoelectric percussion mechanism, the thrust exerted on the thrust member increases with the displacement of the latter, in particular as a function of the deflection imposed on the elastic return load (spring in general) ; past a certain value of this thrust, the striker is' projected, under the effect of its own elastic load, against the piezoelectric ceramic, and it is this value which should be retained as being the force necessary for the actuation of the piezoelectric mechanism.

Par force nécessaire pour ouvrir au moins partiellement la vanne de sécurité, on entend la valeur de la poussée exercée sur le poussoir, permettant d'ouvrir au moins partiellement ladite vanne, et d'assurer le passage d'un débit gazeux au moins suffisant à l'allumage du brûleur, avec lequel ladite vanne communique.By force necessary to at least partially open the safety valve means the value of the thrust exerted on the pusher, allowing at least partially to open said valve, and ensuring the passage of a gas flow at least sufficient for ignition of the burner, with which said valve communicates.

Comme précédemment, la poussée exercée sur le poussoir de la vanne de sécurité croît avec le déplacement de ce dernier, notamment en fonction de la flèche imposée à la charge élastique de rappel (ressort en général).As before, the thrust exerted on the pusher of the safety valve increases with the displacement of the latter, in particular as a function of the deflection imposed on the elastic return load (spring in general).

Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer :

  • Fig. 1 représente une vue de dessus d'un système d'alluma ge conforme à la présente invention, avec coupe partielle la vanne de sécurité et le mécanisme piézo-électrique étant en position de repos.
  • Fig. 2 représente une vue en perspective, avec arrachemer partiels, du mécanisme piézo-électrique faisant partie du système conforme à la fig. 1.
The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:
  • Fig. 1 shows a top view of an ignition system according to the present invention, with partial section of the safety valve and the piezoelectric mechanism being in the rest position.
  • Fig. 2 shows a perspective view, with partial cutaway, of the piezoelectric mechanism forming part of the system according to FIG. 1.

Un système de sécurité conforme à l'invention regroupe de façon alignée, les uns derrière et contre les autres, un moyen d'actionnement 1, un mécanisme piézo-électrique 2, et une vanne de sécurité 3. La vanne de sécurité est retenue par deux équerres 4 et 5 dont l'aile verticale comporte un orifice ajusté pour recevoir le corps 6 de la vanne de sécurité. Le blocage de la vanne de sécurité sur le support constitué par les deux équerres 4 et 5 s'effectue grâce d'une part à l'écrou épaulé 7 en appui contre l'équerre 5, et d'autre part par un anneau d'arrêt 8 monté à force de l'autre côté de la même équerre. Une pièce intermédiaire 9 renferme le mécanisme.piézo-électrique, et l'organe de poussée 10 appartenant à ce dernier sort librement de cette pièce. Le moyen d'actionnement, ou bouton-poussoir 1, est constitué de deux parties 11 et 12 colorées différemment, emboîtées l'une sur l'autre. Le bouton-poussoir 1 est fixé sur l'organe de poussée 10 du mécanisme 2, par l'intermédaire d'une vis 13 retenant la partie 11 du moyen d'actionnement 1. La partie arrière de la pièce intermédiaire 9, opposée à l'organe de poussée 10, est fixée sur le poussoir 14 de la vanne de sécurité 3, par exemple au moyen d'une agrafe 15, venant se loger dans deux fentes prévues sur la pièce 9 et une gorge circulaire prévue sur le poussoir 14. Ainsi, la partie arrière du mécanisme 2, opposée à l'organe de poussée 10, est constamment en appui contre le poussoir 14 de la vanne 3. Une cornière 16 comportant un orifice évasé 17 sert de- guide au bouton-poussoir 1.A security system in accordance with the invention brings together, behind and against each other, an actuating means 1, a piezoelectric mechanism 2, and a safety valve 3. The safety valve is retained by two brackets 4 and 5, the vertical wing of which has an orifice adjusted to receive the body 6 of the safety valve. The safety valve is blocked on the support constituted by the two brackets 4 and 5 is effected on the one hand by the shouldered nut 7 bearing against the bracket 5, and on the other hand by a ring of stop 8 forcibly mounted on the other side of the same bracket. An intermediate part 9 encloses the piezoelectric mechanism, and the thrust member 10 belonging to the latter freely exits from this part. The actuating means, or push button 1, is consisting of two parts 11 and 12 differently colored, nested one on the other. The push button 1 is fixed to the pushing member 10 of the mechanism 2, by means of a screw 13 retaining the part 11 of the actuating means 1. The rear part of the intermediate part 9, opposite to the the pushing member 10 is fixed to the pusher 14 of the safety valve 3, for example by means of a clip 15, which is received in two slots provided on the part 9 and a circular groove provided on the pusher 14. Thus, the rear part of the mechanism 2, opposite the pushing member 10, is constantly in abutment against the push-button 14 of the valve 3. An angle iron 16 having a flared orifice 17 serves as a guide for the push-button 1.

Conformément à fig. 2, de manière en soi connue, le mécanisme piézo-électrique comporte un boîtier 18, l'organe de poussée 10, mobile en translation, étant susceptible de s'enfoncer dans le boîtier. Une céramique piézo-électrique 19 est contenue dans le boîtier 18. Le déplacement de l'organe de poussée 10 dans le boîtier 18 permet à la fois de charger un ressort de rappel 20, et de projeter en translation un percuteur 21 contre la céramique 19, sous l'effet d'un autre ressort 22, préalablement chargé lors du même déplacement de l'organe de poussée 10 ; la percussion se déclenche lorsque l'ergot 23 solidaire du percuteur 21 échappe de son logement 24 prévu sur le boîtier 18, sous l'effet de la rampe 25 prévue sur l'organe de poussée 10. Le retour à la position initiale de l'organe de poussée 10 et du percuteur 21 s'effectue sous le seul effet du ressort de rappel 20, la contre-rampe 26 prévue sur l'organe 10 ramenant l'ergot 23 dans son logement 24.In accordance with fig. 2, in a manner known per se, the piezoelectric mechanism comprises a housing 18, the thrust member 10, movable in translation, being capable of sinking into the housing. A piezoelectric ceramic 19 is contained in the housing 18. The displacement of the thrust member 10 in the housing 18 makes it possible both to load a return spring 20, and to project in translation a striker 21 against the ceramic 19 , under the effect of another spring 22, previously loaded during the same movement of the thrust member 10; the percussion is triggered when the lug 23 integral with the striker 21 escapes from its housing 24 provided on the housing 18, under the effect of the ramp 25 provided on the thrust member 10. The return to the initial position of the thrust member 10 and striker 21 takes place under the sole effect of the return spring 20, the counter-ramp 26 provided on the member 10 bringing the lug 23 back into its housing 24.

De la description à la fois de la constitution et du fonctionnement du mécanisme piézo-électrique 2, il résulte que la force nécessaire à son actionnement est égale à la somme de la charge élastique du ressort 20 et de celle du ressort 22, au moment où l'ergot 23 quitte son logement 24, c'est-à-dire approximativement en fin de course de l'organe de poussée 10.From the description of both the constitution and the operation of the piezoelectric mechanism 2, it follows that the force necessary for its actuation is equal to the sum of the elastic load of the spring 20 and that of the spring 22, when the lug 23 leaves its housing 24, that is to say approximately at the end of the travel of the thrust member 10.

Conformément à la fig. 1, la vanne de sécurité 3 comporte le corps tubulaire 6 dont l'extrémité opposée à l'écrou 7 est associée au poussoir 14, chargé élastiquement vers l'extérieur par un ressort de compression 27. L'extrémité intérieure du poussoir 14 comporte une tige 28 propre à agir sur un clapet 29 repoussé contre son siège 6a par l'intermédaire d'un autre ressort 30. Un élément thermo-sensible 31, par exemple un électro-aimant, maintient le clapet 29 ouvert si le capteur (non représenté) relié à lui par un fil 32, atteint une température déterminée.In accordance with fig. 1, the safety valve 3 comprises the tubular body 6, the end opposite the nut 7 is associated with the pusher 14, loaded elastically towards the outside by a compression spring 27. The interior end of the pusher 14 has a rod 28 capable of acting on a valve 29 pushed against its seat 6a by means of another spring 30. A heat-sensitive element 31, for example an electromagnet, keeps the valve 29 open if the sensor (not shown) ) connected to it by a wire 32, reaches a determined temperature.

Le poussoir 14 peut-être maintenu à une position intermédaire, grâce à la présence de billes 33 chargées de manière centrifuge et coopérant avec un chanfrein 6b du corps. Bien entendu, la' vanne de sécurité est pourvue d'une entrée de gaz 34 (about) située en amont du clapet 29, et d'une sortie de gaz 35 située en aval du clapet.The pusher 14 can be maintained in an intermediate position, thanks to the presence of balls 33 loaded centrifugally and cooperating with a chamfer 6b of the body. Of course, the safety valve is provided with a gas inlet 34 (about) located upstream of the valve 29, and a gas outlet 35 located downstream of the valve.

D'après la description précédente de l'agencement et du fonctionnement de la vanne de sécurité, la force nécessaire pour l'ouvrir au moins partiellement au moyen du poussoir 14, c'est-à-dire la force nécessaire pour déplacer le clapet 29 et atteindre entre ce dernier et le siège une section de passage suffisante pour allumer le brûleur, est égale approximativement à la charge élastique du ressort 27, plus la charge élastique du ressort 30, lorsque ladite section de passage suffisante est atteinte.'Selon l'invention, c'est cette force qui doit demeurer inférieure à la force d'actionnement du mécanisme piézo-électrique.According to the preceding description of the arrangement and operation of the safety valve, the force necessary to open it at least partially by means of the pusher 14, that is to say the force necessary to move the valve 29 and reach between the latter and the seat a passage section sufficient to ignite the burner, is approximately equal to the elastic load of the spring 27, plus the elastic load of the spring 30, when said sufficient passage section is reached. invention, it is this force which must remain less than the actuation force of the piezoelectric mechanism.

Le fonctionnement du système d'allumage selon l'invention est en substance le suivant, en partant de la position de repos de la fig. 1, et en enfonçant progressivement le bouton-poussoir 1 :

  • - Dans une première partie de la course, on enfonce le poussoir 14 de la vanne de sécurité 3 sans enfoncer l'organe de poussée 10 du mécanisme piézo-électrique 2 ; à la fin de cette première partie, la poussée exercée sur le bouton-poussoir 1 atteint la force nécessaire pour ouvrir au moins partiellement la vanne de sécurité ;
  • - Dans une deuxième partie de la course, la poussée exercée dépasse la force précitée, et on enfonce alors l'organe de poussée 10 du mécanisme 2, tout en maintenant enfoncé ou en continuant d'enfoncer le poussoir 14 de la vanne 3 ; à la fin de cette deuxième partie, la poussée exercée sur le bouton-poussoir 1 atteint la force d'actionnement du mécanisme piézo-électrique ; on provoque alors une étincelle au brûleur, via le câble 36 relié à la céramique 19 ;
  • - Lorsqu'on relâche le bouton-poussoir 1, l'organe de poussée 10 du mécanisme 2, et le poussoir 14 de la vanne 3 co-agissent, sous l'effet de leurs charges élastiques respectives, devenues libres, pour ramener le bouton-poussoir 1, soit dans une position intermédiaire, correspondant à la retenue du poussoir 14 sur l'épaulement 6b de la vanne de sécurité, dans laquelle la partie 11 est cachée par la cornière 16, soit dans la position initiale, si la flammme du brûleur n'est pas allumée, position dans laquelle les deux parties 11 et 12 du bouton-poussoir 1 sont visibles.
The operation of the ignition system according to the invention is essentially the following, starting from the rest position of FIG. 1, and by gradually pushing the push button 1:
  • - In a first part of the stroke, the pusher 14 of the safety valve 3 is depressed without depressing the pusher member 10 of the piezoelectric mechanism 2 ; at the end of this first part, the thrust exerted on the push button 1 reaches the force necessary to at least partially open the safety valve;
  • - In a second part of the stroke, the thrust exerted exceeds the aforementioned force, and then pushes the pushing member 10 of the mechanism 2, while holding down or continuing to push the plunger 14 of the valve 3; at the end of this second part, the thrust exerted on the push button 1 reaches the actuating force of the piezoelectric mechanism; a spark is then caused to the burner, via the cable 36 connected to the ceramic 19;
  • - When the push-button 1 is released, the pushing member 10 of the mechanism 2, and the push-button 14 of the valve 3 co-act, under the effect of their respective elastic loads, which have become free, to bring the button back -pusher 1, either in an intermediate position, corresponding to the retention of the pusher 14 on the shoulder 6b of the safety valve, in which the part 11 is hidden by the angle 16, or in the initial position, if the flame of the burner is not lit, position in which the two parts 11 and 12 of the push button 1 are visible.

L'invention s'applique à tout appareil à brûleur à gaz notamment les réfrigérateurs à absorption équipés d'un tel brûleur.The invention applies to any gas burner appliance, in particular absorption refrigerators equipped with such a burner.

Claims (8)

1. Système d'allumage piézo-électrique d'un brûleur à,,gaz avec sécurité, comportant : - une vanne de sécurité thermo-sensible (3), avec poussoir (14) chargé élastiquement, permettant d'ouvrir la vanne lorsque le brûleur n'est pas allumé ; - un mécanisme piézo-électrique (2) comportant un organe de poussée (10) chargé élastiquement ; - un moyen unique d'actionnement (1), permettant d'actionner le poussoir (14) de la vanne de sécurité (3), puis l'organe de poussée (10) du mécanisme piézo-électrique (2), le réarmement du moyen d'actionnnment (1) s'effectuant sous le seul effet des charges élastiques de la vanne de sécurité (3) et du mécanisme piézo-électrique (2), caractérisé en ce que le moyen d'actionnement (1) est solidaire de l'organe de poussée (10) du mécanisme piézo-électrique (2), lequel par sa partie opposée audit organe de poussée (10) coopère avec le poussoir (14) de la vanne de sécurité (3), et en ce que la force nécessaire à l'actionnement du mécanisme piézo-électrique (2) est supérieure à la force nécessaire pour ouvrir au moins partiellement la vanne de sécurité (3), au moyen du poussoir (14). 1. Piezoelectric ignition system of a gas burner with safety device, comprising: - a thermosensitive safety valve (3), with pusher (14) loaded elastically, allowing the valve to be opened when the burner is not lit; - a piezoelectric mechanism (2) comprising a thrust member (10) loaded elastically; - a single actuating means (1), making it possible to actuate the pusher (14) of the safety valve (3), then the pusher member (10) of the piezoelectric mechanism (2), resetting the actuation means (1) being effected under the sole effect of the elastic loads of the safety valve (3) and of the piezoelectric mechanism (2), characterized in that the actuation means (1) is integral with the pushing member (10) of the piezoelectric mechanism (2), which by its part opposite to said pushing member (10) cooperates with the pusher (14) of the safety valve (3), and in that the force required to actuate the piezoelectric mechanism (2) is greater than the force necessary to at least partially open the safety valve (3), by means of the pusher (14). 2. Système selon la revendication 1, caractérisé en ce que le moyen d'actionnement (1) est distinct de l'organe de poussée (10) et fixé sur ce dernier.2. System according to claim 1, characterized in that the actuating means (1) is separate from the pushing member (10) and fixed on the latter. 3. Système selon la revendication 1, caractérisé en ce que la partie du mécanisme piézo-électrique (2) opposée à l'organe de poussée (10) est en appui contre le poussoir (14) de la vanne de sécurité (3).3. System according to claim 1, characterized in that the part of the piezoelectric mechanism (2) opposite the thrust member (10) bears against the pusher (14) of the safety valve (3). 4. Système selon la revendication 3, caractérisé en ce qu'une pièce intermédiaire (9) associe, d'une part la partie (18) du mécanisme piézo-électrique (2) opposée à l'organe de poussée (10), et d'autre part le poussoir (11) de la vanne de sécurité (3).4. System according to claim 3, characterized in that an intermediate part (9) combines, on the one hand the part (18) of the piezoelectric mechanism (2) opposite the thrust member (10), and on the other hand the plunger (11) of the safety valve (3). 5. Système selon la revendication 1, caractérisé en ce que le moyen d'actionnement (1) coopère avec un moyen de guidage (17).5. System according to claim 1, characterized in that the actuating means (1) cooperates with a guide means (17). 6. Système selon la revendication 1, caractérisé en ce que le moyen d'actionnement (1), le mécanisme piézo-électrique (2), et la vanne de sécurité (3) sont alignés les uns derrière et contre les autres.6. System according to claim 1, characterized in that the actuating means (1), the piezoelectric mechanism (2), and the safety valve (3) are aligned one behind and against the other. 7. Appareil comportant un brûleur à gaz, caractérisé en ce qu'il est pourvu d'un système d'allumage conforme à l'une quelconque des revendications 1 à 6.7. Apparatus comprising a gas burner, characterized in that it is provided with an ignition system according to any one of claims 1 to 6. 8. Réfrigérateur par absorption avec brûleur à gaz, caractérisé en ce qu'il est pourvu d'un système d'allumage conforme à l'une quelconque des revendications 1 à 6.8. Absorption refrigerator with gas burner, characterized in that it is provided with an ignition system according to any one of claims 1 to 6.
EP19810420183 1980-12-15 1981-12-11 Piezoelectric ignition system for a safety gas burner and apparatuses, in particular absorption refrigerators, using such a system Expired EP0054504B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8026988A FR2496233A1 (en) 1980-12-15 1980-12-15 PIEZOELECTRIC IGNITION SYSTEM OF A GAS BURNER WITH SAFETY, AND APPARATUSES, IN PARTICULAR ABSORPTION REFRIGERATORS, PROVIDED WITH SUCH A SYSTEM
FR8026988 1980-12-15

Publications (2)

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EP0054504A1 true EP0054504A1 (en) 1982-06-23
EP0054504B1 EP0054504B1 (en) 1983-11-23

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EP19810420183 Expired EP0054504B1 (en) 1980-12-15 1981-12-11 Piezoelectric ignition system for a safety gas burner and apparatuses, in particular absorption refrigerators, using such a system

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EP (1) EP0054504B1 (en)
DE (1) DE3161515D1 (en)
FR (1) FR2496233A1 (en)
HU (1) HU183737B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105674549B (en) * 2016-04-01 2019-03-05 邓辉 A kind of full-automatic piezoelectron sparking water heater

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1593706A (en) * 1967-11-28 1970-06-01
FR2099023A5 (en) * 1970-10-27 1972-03-10 Leblanc Marcel
FR2112637A5 (en) * 1970-11-03 1972-06-23 Antargaz
FR2181848A1 (en) * 1972-04-22 1973-12-07 Pamplona Metalicas

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1593706A (en) * 1967-11-28 1970-06-01
FR2099023A5 (en) * 1970-10-27 1972-03-10 Leblanc Marcel
FR2112637A5 (en) * 1970-11-03 1972-06-23 Antargaz
FR2181848A1 (en) * 1972-04-22 1973-12-07 Pamplona Metalicas

Also Published As

Publication number Publication date
EP0054504B1 (en) 1983-11-23
FR2496233B1 (en) 1983-02-18
HU183737B (en) 1984-05-28
DE3161515D1 (en) 1983-12-29
FR2496233A1 (en) 1982-06-18

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