EP0084992B1 - Manometric capsule security and commanding apparatus for instant gas apparatuses - Google Patents

Manometric capsule security and commanding apparatus for instant gas apparatuses Download PDF

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Publication number
EP0084992B1
EP0084992B1 EP19830400081 EP83400081A EP0084992B1 EP 0084992 B1 EP0084992 B1 EP 0084992B1 EP 19830400081 EP19830400081 EP 19830400081 EP 83400081 A EP83400081 A EP 83400081A EP 0084992 B1 EP0084992 B1 EP 0084992B1
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EP
European Patent Office
Prior art keywords
membrane
improvement according
small
plunger system
piston
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
EP19830400081
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German (de)
French (fr)
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EP0084992A1 (en
Inventor
Jean-Claude Charron
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
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Publication date
Application filed by Saunier Duval Eau Chaude Chauffage SDECC SA filed Critical Saunier Duval Eau Chaude Chauffage SDECC SA
Publication of EP0084992A1 publication Critical patent/EP0084992A1/en
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Publication of EP0084992B1 publication Critical patent/EP0084992B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F23N5/06—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using bellows; using diaphragms
    • F23N5/067—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using bellows; using diaphragms using mechanical means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/1407—Combustion failure responsive fuel safety cut-off for burners

Definitions

  • the invention which relates to control and safety devices for instantaneous gas appliances of the water heater or bath heater type relates more particularly to an improvement in small manometric capsules.
  • the flame detection devices operate according to several well-known and widely applied principles. Among these there is a system which not only ensures this safety role, but also that of a direct control member of a valve. It is a pressure capsule system consisting, as we know, of a small sealed enclosure or bulb filled with air placed in the flame that we want to detect, and of a capillary tube, connected to a nozzle closed by a small expandable membrane, this having the possibility of swelling under the effect of the expansion of the air contained in the bulb and of operating a valve for the admission of gas to the burner.
  • This system has the merit of being simple, but because of the mechanical energy that would be required if it were used as the main gas intake control member, it is preferred to use it upstream of the main control valve. , as a gas control and regulation device and particularly in instant hot water production devices operating without a permanent pilot.
  • the object of the invention is to avoid this drawback by allowing the pressure capsule to fill up again with air when the bulb is no longer heated by the flame to be detected.
  • the small expandable membrane is pierced with a central orifice allowing the passage of a push-button system cooperating with it to authorize, as soon as the heating and cooling of the bulb stops, the passage of air from the outside towards the inside of the manometric capsule via this orifice, the inside of the manometric capsule then being in depression with respect to the atmosphere.
  • the manometric capsule comprises a bulb, not shown, constituting the flame detector and a capillary tube 1 (fig. 1) which is connected to a well 2 provided in a small end piece 3. At the bottom of said end piece is crimped a small membrane. expandable 4 pierced with a central orifice 5 in the extension of the well 2 and the tube 1.
  • This small membrane 4 is supported on the upper face of a horizontal cup 7 of a piston 6, the central part of which carries a vertical guide rod 8 which passes through the orifice 5 of the membrane and which opens into the well 2 of end piece 3.
  • the piston 6 comprises at the connection edge between the vertical rod 8 and the horizontal cup 7, a chamfer 9 which serves as a bearing surface for the lip 10 limiting the orifice 5 of the membrane 4.
  • the horizontal cup 7 has over its entire length a groove 11; similarly, the vertical rod 8 also includes over its entire length a groove 12.
  • the underside of the piston 6 is provided with a bulge 13 bearing on a rocker lever 14 for controlling a valve (not shown) for admitting the gas.
  • a cap 15 force-fitted around the endpiece 3 supports the piston 6 before mounting the lever 14 and serves as crimping for the membrane 4.
  • the air contained in the manometric capsule ends up escaping by osmosis through the membrane or the solderings between the bulb and the capillary tube so that as soon as l 'heating and cooling of the bulb stop, the interior of the pressure capsule is in depression compared to the atmosphere.
  • the membrane 4 is sucked inwards (FIG. 3) and the lip 10 comes off the chamfer 9 which allows the outside air to enter the tube 1 and the bulb passing through the grooves 11 and 12.
  • FIGS. 4 and 5 illustrate two other variants of the invention.
  • the piston 6 is replaced by a small diabolo 17, the central part of which has small grooves 18.
  • the membrane 4 and the small diabolo 17 are sucked inwards so that the upper face of said diabolo abuts against the base of the capillary tube 1.
  • the lip 10 of the membrane peels off from the diabolo 17 and releases the grooves 18 for the passage of air which again fills the manometric capsule.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Control Of Combustion (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Safety Valves (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Feeding And Controlling Fuel (AREA)

Description

L'invention qui se rapporte aux dispositifs de commande et de sécurité pour appareils instantanés à gaz dû genre chauffe-eau ou chauffe-bains concerne plus particulièrement un perfectionnement aux petites capsules manométriques.The invention which relates to control and safety devices for instantaneous gas appliances of the water heater or bath heater type relates more particularly to an improvement in small manometric capsules.

Les dispositifs de détection de flamme dont le rôle est de réagir à l'extinction d'une veilleuse pour arrêter l'admission du gaz au brûleur principal d'un appareil tel qu'un chauffe-eau ou un chauffe-bains instantané, fonctionnent suivant plusieurs principes connus et largement appliqués. Il existe parmi ceux-ci un système qui permet non seulement d'assurer ce rôle de sécurité, mais aussi celui d'organe de commande directe d'un clapet. Il s'agit d'un système à capsule manométrique constitué comme on sait d'une petite enceinte étanche ou bulbe remplie d'air placé dans la flamme qu'on veut détecter, et d'un tube capillaire, raccordé à un embout fermé par une petite membrane dilatable, celle-ci ayant la possibilité de se gonfler sous l'effet de la dilatation de l'air contenu dans le bulbe et de manoeuvrer un clapet pour l'admission du gaz au brûleur.The flame detection devices, the role of which is to react to the extinction of a pilot light to stop the admission of gas to the main burner of an appliance such as a water heater or an instantaneous bath heater, operate according to several well-known and widely applied principles. Among these there is a system which not only ensures this safety role, but also that of a direct control member of a valve. It is a pressure capsule system consisting, as we know, of a small sealed enclosure or bulb filled with air placed in the flame that we want to detect, and of a capillary tube, connected to a nozzle closed by a small expandable membrane, this having the possibility of swelling under the effect of the expansion of the air contained in the bulb and of operating a valve for the admission of gas to the burner.

Ce système a le mérite d'être simple, mais du fait de l'énergie mécanique qui lui serait demandé s'il était utilisé comme organe principal de commande d'admission du gaz, on préfère l'employer en amont du clapet principal de commande, comme organe de contrôle et de régulation du gaz et particulièrement dans les appareils de production d'eau chaude instantanée fonctionnant sans veilleuse permanente.This system has the merit of being simple, but because of the mechanical energy that would be required if it were used as the main gas intake control member, it is preferred to use it upstream of the main control valve. , as a gas control and regulation device and particularly in instant hot water production devices operating without a permanent pilot.

On s'est aperçu toutefois d'un inconvénient qui apparaît au bout d'un certain temps de fonctionnement et qui se caractérise par le fait que l'air contenu dans la capsule manométrique finit par s'échapper lentement à cause notamment de la porosité de la petite membrane dilatable et des brasures difficilement étanches entre le bulbe et le tube capillaire, si bien que la dilatation de l'air contenu dans ladite capsule n'est plus suffisante pour gonfler la membrane et par conséquent manoeuvrer le clapet d'admission du gaz au brûleur.However, we have noticed a drawback which appears after a certain period of operation and which is characterized by the fact that the air contained in the manometric capsule ends up slowly escaping due in particular to the porosity of the small expandable membrane and hardly tight solder joints between the bulb and the capillary tube, so that the expansion of the air contained in said capsule is no longer sufficient to inflate the membrane and therefore operate the gas inlet valve to the burner.

L'invention a pour objet d'éviter cet inconvénient en permettant à la capsule manométrique de se remplir à nouveau d'air lorsque le bulbe n'est plus chauffé par la flamme à détecter.The object of the invention is to avoid this drawback by allowing the pressure capsule to fill up again with air when the bulb is no longer heated by the flame to be detected.

Suivant l'invention, la petite membrane dilatable est percée d'un orifice central permettant le passage d'un système à poussoir coopérant avec elle pour autoriser, dès l'arrêt du chauffage et refroidissement du bulbe, le passage d'air de l'extérieur vers l'intérieur de la capsule manométrique par l'intermédiaire de cet orifice, l'intérieur de la capsule manométrique se trouvant alors en dépression par rapport à l'atmosphère.According to the invention, the small expandable membrane is pierced with a central orifice allowing the passage of a push-button system cooperating with it to authorize, as soon as the heating and cooling of the bulb stops, the passage of air from the outside towards the inside of the manometric capsule via this orifice, the inside of the manometric capsule then being in depression with respect to the atmosphere.

D'autres caractéristiques particulières et avantages de l'invention ressortiront de la description suivante de formes de réalisation et. en référence aux dessins qui représentent :

  • figure 1 une vue partielle en coupe du dispositif
  • figures 2 et 3 deux vues partielles en coupe montrant le fonctionnement du dispositif. figures 4 et 5 deux vues partielles en coupe de deux variantes de réalisation.
Other particular characteristics and advantages of the invention will emerge from the following description of embodiments and. with reference to the drawings which represent:
  • Figure 1 a partial sectional view of the device
  • Figures 2 and 3 two partial sectional views showing the operation of the device. Figures 4 and 5 two partial sectional views of two alternative embodiments.

La capsule manométrique, comporte un bulbe non représenté, constituant le détecteur de flamme et un tube capillaire 1 (fig. 1) qui est raccordé à un puits 2 prévu dans un petit embout 3. A la partie inférieure dudit embout est sertie une petite membrane dilatable 4 percée d'un orifice central 5 dans le prolongement du puits 2 et du tube 1.The manometric capsule comprises a bulb, not shown, constituting the flame detector and a capillary tube 1 (fig. 1) which is connected to a well 2 provided in a small end piece 3. At the bottom of said end piece is crimped a small membrane. expandable 4 pierced with a central orifice 5 in the extension of the well 2 and the tube 1.

Cette petite membrane 4 est en appui sur la face supérieure d'une coupelle horizontale 7 d'un piston 6 dont la partie centrale porte une tige verticale de guidage 8 qui traverse l'orifice 5 de la membrane et qui débouche dans le puits 2 de l'embout 3.This small membrane 4 is supported on the upper face of a horizontal cup 7 of a piston 6, the central part of which carries a vertical guide rod 8 which passes through the orifice 5 of the membrane and which opens into the well 2 of end piece 3.

Le piston 6 comporte au niveau de l'arête de raccordement entre la tige verticale 8 et la coupelle horizontale 7, un chanfrein 9 qui sert de surface d'appui à la lèvre 10 limitant l'orifice 5 de la membrane 4. D'autre part la coupelle horizontale 7 comporte sur toute sa longueur une rainure 11 ; de même la tige verticale 8 comporte aussi sur toute sa longueur une rainure 12. Ces deux rainures 11 et 12 sont disposées d'un même côté du piston, l'une en face de l'autre.The piston 6 comprises at the connection edge between the vertical rod 8 and the horizontal cup 7, a chamfer 9 which serves as a bearing surface for the lip 10 limiting the orifice 5 of the membrane 4. On the other share the horizontal cup 7 has over its entire length a groove 11; similarly, the vertical rod 8 also includes over its entire length a groove 12. These two grooves 11 and 12 are arranged on the same side of the piston, one opposite the other.

La face inférieure du piston 6 est munie d'un renflement 13 en appui sur un levier basculeur 14 pour la commande d'un clapet non représenté d'admission du gaz.The underside of the piston 6 is provided with a bulge 13 bearing on a rocker lever 14 for controlling a valve (not shown) for admitting the gas.

Un capuchon 15 emmanché à force autour de l'embout 3 soutient le piston 6 avant le montage du levier 14 et sert de sertissage pour la membrane 4.A cap 15 force-fitted around the endpiece 3 supports the piston 6 before mounting the lever 14 and serves as crimping for the membrane 4.

Quand le bulbe de la capsule manométrique est chauffé par une flamme, la dilatation de l'air qu'il contient agit par le tube 1 dans le sens du gonflement de la membrane 4 (cas représenté à la figure 2). De ce fait la lèvre 10 de ladite membrane s'applique de façon étanche sur le chanfrein 9 et provoque le déplacement vers le bas du piston 6, qui fait basculer le levier 14, entraînant l'ouverture du clapet d'admission du gaz.When the bulb of the manometric capsule is heated by a flame, the expansion of the air it contains acts through the tube 1 in the direction of the swelling of the membrane 4 (case shown in Figure 2). Therefore the lip 10 of said membrane is applied in a sealed manner on the chamfer 9 and causes the downward displacement of the piston 6, which causes the lever 14 to tilt, causing the opening of the gas inlet valve.

Au bout d'un certain temps de fonctionnement répété de l'appareil, l'air contenu dans la capsule manométrique finit par s'échapper par osmose au travers de la membrane ou des brasures entre le bulbe et le tube capillaire si bien que dès l'arrêt du chauffage et refroidissement du bulbe, l'intérieur de la capsule manométrique se trouve en dépression par rapport à l'atmosphère. Dans ce cas, la membrane 4 est aspirée vers l'intérieur (figure 3) et la lèvre 10 se décolle du chanfrein 9 ce qui permet à l'air extérieur de pénétrer dans le tube 1 et le bulbe en passant par les rainures 11 et 12. Il se produit donc un remplissage continu et automatique d'air dans la capsule manométrique ce qui garantit dans le temps un fonctionnement correct.After a certain period of repeated operation of the apparatus, the air contained in the manometric capsule ends up escaping by osmosis through the membrane or the solderings between the bulb and the capillary tube so that as soon as l 'heating and cooling of the bulb stop, the interior of the pressure capsule is in depression compared to the atmosphere. In this case, the membrane 4 is sucked inwards (FIG. 3) and the lip 10 comes off the chamfer 9 which allows the outside air to enter the tube 1 and the bulb passing through the grooves 11 and 12. There is therefore a continuous and automatic filling of air in the pressure capsule which guarantees operation over time. correct.

Dès que l'équilibre des pressions, entre l'intérieur et l'extérieur de la capsule manométrique est rétabli, la membrane reprend sa position normale.As soon as the pressure balance between the inside and outside of the pressure capsule is restored, the membrane returns to its normal position.

On se réfère maintenant aux figures 4 et 5 qui illustrent deux autres variantes de l'invention.Reference is now made to FIGS. 4 and 5 which illustrate two other variants of the invention.

On y retrouve dans les deux cas le tube capillaire 1 raccordé au puits 2 du petit embout 3, la membrane 4 percée d'un orifice central 5 et le levier 14 de commande du clapet d'admission du gaz.There are in both cases the capillary tube 1 connected to the well 2 of the small nozzle 3, the membrane 4 pierced with a central orifice 5 and the lever 14 for controlling the gas inlet valve.

Dans la première variante figure 4, à la place des rainures, la coupelle horizontale 7 du piston 6 est percée de petits orifices 16 pour le passage de l'air, le fonctionnement étant absolument identique à celui décrit pour la réalisation précédente.In the first variant in FIG. 4, in place of the grooves, the horizontal cup 7 of the piston 6 is pierced with small holes 16 for the passage of air, the operation being absolutely identical to that described for the previous embodiment.

Dans la seconde variante représentée à la figure 5, le piston 6 est remplacé par un petit diabolo 17 dont la partie centrale comporte des petites rainures 18. Quand l'intérieur de la capsule manométrique est en dépression par rapport à l'atmosphère, la membrane 4 et le petit diabolo 17 sont aspirés vers l'intérieur de telle sorte que la face supérieure dudit diabolo bute contre la base du tube capillaire 1. A ce moment la lèvre 10 de la membrane se décolle du diabolo 17 et dégage les rainures 18 pour le passage de l'air qui remplit à nouveau la capsule manométrique.In the second variant shown in FIG. 5, the piston 6 is replaced by a small diabolo 17, the central part of which has small grooves 18. When the inside of the pressure capsule is in depression relative to the atmosphere, the membrane 4 and the small diabolo 17 are sucked inwards so that the upper face of said diabolo abuts against the base of the capillary tube 1. At this moment the lip 10 of the membrane peels off from the diabolo 17 and releases the grooves 18 for the passage of air which again fills the manometric capsule.

Claims (10)

1. An improvement of the control and safety devices for instant gas appliances of the water heater or bath heater type using a manometric capsule formed by a mini air bulb disposed within a pilot flame and a small capillary duct (1) connected to an end fitting (3) with a dilatable membrane (4) for controlling a gas intake valve, characterized in that the small dilatable membrane (4) of the end fitting (3) is pierced by a central opening (5) allowing a plunger system (6-17) to pass which cooperates with the membrane (4) and is shaped in such a manner that it allows air to pass after stoppage of the heating and cooling of the mini bulb, from the outside towards the inside of the manometric capsule via the said opening (5) since the inside of the manometric capsule is then at a reduced pressure in relation to the atmosphere.
2. An improvement according to claim 1, characterised in that the plunger system (6-17) comprises air ducts which can be obturated by the small dilatable membrane (4) itself.
3. An improvement according to claim 2, characterised in that the air ducts of the plunger system (6-17) are grooves (11-12 and 18) or small orifices (16).
4. An improvement according to claim 1, characterised in that the plunger system is a piston (6) comprising on the one hand a horizontal cup (7) whereon there can bear the small membrane (4) and on the other hand a vertical stem (8) passing through the opening (5) of the said membrane and emerging in a duct (2) of the end fitting (3) connected to the capillary tube (1) of the manometric capsule.
5. An improvement according to claims 3 and 4, characterised in that the groove (11) is obtained over the whole length of the horizontal cup (7) and groove (12) over the whole length of the vertical stem (8).
6. An improvement according to claim 5, characterised in that the two grooves (11) and (12) are disposed on the same side of the cylinder (6) and face each other.
7. An improvement according to claims 3 and 4, characterised in that the air passage opening (16) are obtained in the horizontal cup (7) of piston (6).
8. An improvement according to claim 4, characterised in that the piston (6) does, at the level of the line joining the horizontal cup (7) and the vertical stem (8), comprise a chamfer (9) whereone there bears the lip (10) in a leak proof manner which bounds orifice (5) of the dilatable membrane (4).
9. An improvement according to claim 1, characterised in that the plunger system is formed by a small twin wheel (17).
10. An improvement according to claims 3 and 9, characterised in that the grooves (18) for the air ducts are obtained in the central portion of the small twin wheel (17).
EP19830400081 1982-01-25 1983-01-13 Manometric capsule security and commanding apparatus for instant gas apparatuses Expired EP0084992B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8201060A FR2520486A1 (en) 1982-01-25 1982-01-25 IMPROVEMENT TO MANOMETER CAPSULE DEVICES FOR SAFETY AND CONTROL FOR INSTANT GAS APPLIANCES
FR8201060 1982-01-25

Publications (2)

Publication Number Publication Date
EP0084992A1 EP0084992A1 (en) 1983-08-03
EP0084992B1 true EP0084992B1 (en) 1986-12-03

Family

ID=9270272

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830400081 Expired EP0084992B1 (en) 1982-01-25 1983-01-13 Manometric capsule security and commanding apparatus for instant gas apparatuses

Country Status (6)

Country Link
US (1) US4518003A (en)
EP (1) EP0084992B1 (en)
JP (1) JPS5935717A (en)
DE (1) DE3368116D1 (en)
ES (1) ES285718Y (en)
FR (1) FR2520486A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT387646B (en) * 1984-09-10 1989-02-27 Vaillant Gmbh BACKFLOW FUSE FOR A FUEL HEATED SOURCE
EP0280406A1 (en) * 1987-02-07 1988-08-31 Concentric Controls Limited Flame failure devices

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20835A (en) * 1858-07-06 Steam-alarm and safety apparatus
US2704648A (en) * 1955-03-22 Diaphragm operated pivoted valve
US2217419A (en) * 1935-12-24 1940-10-08 Metals & Controls Corp Thermostatically controlled device
US2746471A (en) * 1952-03-29 1956-05-22 Penn Controls Pressure regulator and shut-off valve
FR1301169A (en) * 1961-09-20 1962-08-10 Saunier Duval Very low inertia flame detector device for gas appliances and in particular for instantaneous water heaters and gas bath heaters operating without a standing pilot
US3204686A (en) * 1963-03-26 1965-09-07 Robertshaw Controls Co Combined manual and safety valve control
FR1356159A (en) * 1963-05-07 1964-03-20 Landis & Gyr Sa Device for starting and monitoring the gas flow of a gas heating appliance
FR1384389A (en) * 1964-02-21 1965-01-04 Robertshaw Controls Co Control device for safety valve
FR1494853A (en) * 1966-07-25 1967-09-15 Utilisation Ration Gaz Improvements to thermostatic control devices with combined actions, in particular for gas burners
GB1344260A (en) * 1970-04-23 1974-01-16 United Gas Industries Ltd Flame-operated gas burner valve device

Also Published As

Publication number Publication date
ES285718Y (en) 1986-10-16
JPS5935717A (en) 1984-02-27
JPH0231288B2 (en) 1990-07-12
ES285718U (en) 1986-03-01
FR2520486B1 (en) 1984-03-16
EP0084992A1 (en) 1983-08-03
FR2520486A1 (en) 1983-07-29
US4518003A (en) 1985-05-21
DE3368116D1 (en) 1987-01-15

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