EP0073717A1 - Tight forced-draught burner with microprocessor regulation - Google Patents

Tight forced-draught burner with microprocessor regulation Download PDF

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Publication number
EP0073717A1
EP0073717A1 EP82401584A EP82401584A EP0073717A1 EP 0073717 A1 EP0073717 A1 EP 0073717A1 EP 82401584 A EP82401584 A EP 82401584A EP 82401584 A EP82401584 A EP 82401584A EP 0073717 A1 EP0073717 A1 EP 0073717A1
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EP
European Patent Office
Prior art keywords
microprocessor
regulation
burner
information
air
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.)
Granted
Application number
EP82401584A
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German (de)
French (fr)
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EP0073717B1 (en
Inventor
Franck Boulle
Michel Zveguintzoff
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
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Saunier Duval Eau Chaude Chauffage SDECC SA
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Application filed by Saunier Duval Eau Chaude Chauffage SDECC SA filed Critical Saunier Duval Eau Chaude Chauffage SDECC SA
Priority to AT82401584T priority Critical patent/ATE20381T1/en
Publication of EP0073717A1 publication Critical patent/EP0073717A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/06—Regulating fuel supply conjointly with draught
    • F23N1/062—Regulating fuel supply conjointly with draught using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F23N1/10—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught
    • F23N1/102—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/06—Sampling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/08—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/14—Ambient temperature around burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/19—Measuring temperature outlet temperature water heat-exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/06—Postpurge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/12—Burner simulation or checking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/20—Calibrating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/28—Ignition circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/02—Ventilators in stacks
    • F23N2233/04—Ventilators in stacks with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00—Fuels
    • F23N2239/04—Gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/06—Space-heating and heating water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/08—Regulating air supply or draught by power-assisted systems
    • F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel

Definitions

  • the invention relates to gas boilers of the sealed type with forced draft and relates more precisely to a new mode of regulation by microprocessor.
  • a regulation system must also ensure a safety function both at the time of ignition but also during operation by monitoring the temperature in various places of the appliance to correct excess or insufficient temperature or secure the device if necessary. To this end, the regulation must collect and analyze at each instant as a function of the determined setpoint values, characteristic signals of deviations from these values, supplied by sensors.
  • the invention provides a microprocessor-based control system which avoids these drawbacks and provides all of the control functions. lation and safety, while allowing 1a verification at all times of the device regulation card by simulating commands.
  • this microprocessor-based regulation allows systems to be adapted by a simple change of memory without touching the components, it also provides a much finer proportional and integral proportional action regulation and also has advantages over dimensional plan.
  • the device shown is made up of a sealed enclosure 1, the bottom of which isolates the sealed part from the mechanisms and members of this regulation arranged at the bottom, the assembly being mounted on the same frame, not shown.
  • an L-shaped exhaust gas exhaust hood 2 caps a fin block 3 which constitutes the heating body of the appliance, the skirt 4 of which channels the gases coming from the burners 5.
  • an exhaust fan 6 On the vertical part of the chimney hood is fitted with an exhaust fan 6, the drive motor 7 of which occupies the space provided between the hood and the upper part of the enclosure.
  • the fan 6 extracts the combustion gases via an exhaust pipe 8 coaxial with the air intake pipe 9.
  • the latter opens into an air distributor housing 10 placed at the upper part of the sealed enclosure, itself in communication through an orifice 11 with the interior chamber.
  • the solenoid valve 12 for admitting gas to the burner supplied by a gas inlet pipe 13, by means of a circuit breaker housing 14 which ensures also the electric powering of the boiler.
  • the reversing valve 15 the closing member of which is not shown distributes the primary hot water leaving the exchanger through the conduit 16, ie towards the hot start. fage 17, with return through the conduit 20 -or towards a short circuit 18, a pump 19 being interposed on the common conduit 21 returning to the exchanger.
  • the domestic water circuit supplied by the inlet tube 22 supplies water to the draw-off points via the domestic water departure tube 23.
  • an igniter 24 supplies a spark train to the pilot 25.
  • the purpose of the microprocessor-based regulation system is to control terminal members as a function of information collected by sensors.
  • the microprocessor control unit 26 receives for this purpose information from temperature sensors such as the room thermostat 27 mounted outside the device and the heating water return sensor 28 mounted on the duct 21.
  • the information are also received from an air flow sensor 29 mounted on the air intake orifice 11 inside the sealed enclosure from the distributor housing 10.
  • These sensors except the room thermostat , deliver an analog signal (variable voltage depending on the quantity to be measured) which must be converted into digital values which can be assimilated by the microprocessor.
  • other information is provided by a sensor 30 mounted on the motor 7 of the exhaust fan.
  • Said sensor detects the passage of four magnets fixed on the end of the motor shaft or of a notched disc followed by an optoelectric reader and delivers a digital signal whose frequency is proportional to the speed of the motor.
  • information on the drawing of sanitary water is provided by a drawing contact 31 disposed at the level of the reversing valve 15.
  • a contact linked to the igniter 24 provides the housing 26 with information on the ignition cycle.
  • the terminal members capable of being thus controlled by the regulation system are the gas solenoid valve 12, the water circulation pump 19, the igniter 24, and in the sealed enclosure of the device the exhaust fan. 6.
  • a first initialization sequence aims to "teach" the microprocessor the context in which it will regulate the boiler. This sequence is as follows: - the gas inlet and the igniter 24 are inhibited; - The exhaust fan 6 is put into operation at maximum speed then the microprocessor thanks to the sensor 29 comes to read the value of the air flow rate which passes through the orifice 11 of the distributor box 10 to the interior chamber of the device. This value must be equal to a determined value below which there would be a failure to install and stop programming. If this value is therefore normal, it is stored in memory after calculation, as being the minimum flow value corresponding to the full flow rate of the exhaust fan. This fan is then passed to 50% of its maximum speed and a new flow measurement is carried out. The memorized value then represents the minimum value of air flow for the small flow of fan 6. This is then stopped; the igniter 24 is energized to light the pilot 25. The release of the push button at the circuit breaker box 14 completes this initialization sequence.
  • the purpose of these two flow measurements is to calibrate the air flow sensor so as to eliminate the influence of the position of the suction cup.
  • the microprocessor periodically reads the state of the temperature sensors at room thermostat 27 and at draw-off contact 31.
  • the circulation pump 19 remains stopped and the fan d Extraction only starts very intermittently (for example 15 seconds every 5 minutes) and at reduced speed (50% of nominal speed) to ensure the air supply to the pilot.
  • the circulation pump 19 Upon receipt of an order from the room thermostat 27, that is to say as soon as the temperature sensed is below the predetermined threshold, and there is a demand for calories, the circulation pump 19 starts working ; the gas inlet by the solenoid valve 12 and the speed of the exhaust fan 6 are then modulated by the microprocessor 26 in order to ensure a constant proportionality of the air-gas mixture and to maintain a water return temperature of heating via line 20, equal to the set temperature adjusted by the user since the power is adaptable to the needs of the installation. In the event of burner 5 stopping, it will not be able to re-ignite before a certain delay (of the order of one minute for example) in order to avoid too repeated cycles of switching on and off.
  • the pump and the exhaust fan will be kept in operation for some time (for example 45 seconds) after the gas has stopped and the ignition of the burner will only take place through a small phase. flow to ensure silent ignition.
  • the air flow sensor 29 informs the microprocessor 26 of the air flow admitted into the device through the orifice 11. If the latter is insufficient to ensure the correct combustion of the gas introduced, the gas flow will then be reduced to reach the mixture suitable for correct combustion.
  • the microprocessor Upon receipt of an order from the drawing contact 31, that is to say as soon as there is a call for calories when the user draws water, because this call has priority over during heating, the microprocessor then regulates the primary circuit (16, 21) that the reversing valve 15 distributes via the short circuit 18. This regulation of a principle analogous to that of heating operation is done at a fixed setpoint value allowing '' obtain a satisfactory temperature on the secondary drawing-off circuit.
  • This microprocessor-based control system also provides a test program making it possible to verify the operation of the control card outside the boiler by simulating the commands sent to the terminal members as a function of information applied to the inputs.

Abstract

The invention concerns a control device for gas boilers. The overall functions involving control and safety are ensured by a control box (26) with microprocessor which centralizes data collected from the ambient thermostat (27), the temperature sensor (28) on the duct (21) for heating water return, the air output sensor (19), the drawing contact (31), the extraction fan (6) speed sensor (30), and the lighter (24), and it converts them into digital signals that are made to operate the lighter, the circulation pump (19), the gas inlet electrovalve (12) and the extraction fan according to the control data that the microprocessor has memorized. Application for forced draft steamtight gas boilers.

Description

L'invention se rapporte aux chaudières à gaz du type étanche à tirage forcé et concerne plus précisément un nouveau mode de régulation par microprocesseur.The invention relates to gas boilers of the sealed type with forced draft and relates more precisely to a new mode of regulation by microprocessor.

Dans les appareils à gaz du type étanche à tirage forcé on sait que la circulation de l'air nécessaire à la combustion ainsi que simultanément l'évacuation des gaz brûlés sont assurés par un ventilateur puisque le brûleur et le corps de chauffe se trouvent placés dans une enceinte étanche à l'atmosphère du local reliée à l'extérieur par des conduits d'admission et d'évacuation et que cette circulation de flux gazeux ne peut donc s'effectuer naturellement comme dans les chaudières classiques. Ce ventilateur fournit donc un débit d'air qui, lorsque la chaudière est équipée avec une régulation prévoyant une modulation du débit du brûleur proportionnelle aux besoins, doit être asservi au débit de gaz admis à l'appareil c'est-à-dire que ce débit doit s'adapter à la puissance demandée et suivre ainsi les variations de débit de gaz du brûleur. Si on utilise un ventilateur à vitesse de rotation constante, on sait qu'il existe des systèmes de by-pass situés au niveau de la hotte, grâce auxquels une partie de l'air aspiré est directement détourné vers l'évacuation des produits de combustion, la quantité d'air admis au brûleur étant alors celle juste nécessaire pour la combustion correcte à la puissance demandée. On préfère à ces moyens mécaniques, moduler la vitesse du ventilateur à partir d'une mesure prise à chaque instant du débit d'air réel admis au brûleur, des moyens électroniques assurant cet asservissement. Une régulation doit donc en premier lieu centraliser à chaque instant les informations précises sur le débit d'air réel et sur la vitesse du ventilateur puisqu'on sait qu'il n'y a pas forcément correspondance exacte entre ces deux paramètres, par exemple en cas d'encrassement ou de bouchage des conduits.In gas appliances of the sealed forced draft type, it is known that the air circulation necessary for combustion as well as simultaneously the evacuation of the burnt gases is ensured by a fan since the burner and the heating body are placed in an enclosure sealed against the atmosphere of the room connected to the outside by inlet and outlet pipes and that this circulation of gas flow cannot therefore take place naturally as in conventional boilers. This fan therefore provides an air flow which, when the boiler is equipped with a regulation providing a modulation of the burner flow proportional to the needs, must be controlled by the gas flow admitted to the appliance, that is to say that this flow rate must adapt to the power requested and thus follow the variations in gas flow rate from the burner. If we use a fan with constant speed, we know that there are bypass systems located at the level of the hood, thanks to which a part of the sucked air is directly diverted towards the evacuation of combustion products. , the quantity of air admitted to the burner then being that just necessary for correct combustion at the required power. It is preferable to these mechanical means, modulating the fan speed from a measurement taken at each instant of the real air flow admitted to the burner, electronic means ensuring this control. A regulation must therefore first centralize precise information at all times on the actual air flow and on the fan speed since we know that there is not necessarily an exact correspondence between these two parameters, for example in fouling or blockage of conduits.

Un système de régulation doit aussi assurer une fonction de sécurité à la fois au moment de l'allumage mais aussi en cours de fonctionnement en surveillant la température en divers endroits de l'appareil pour rectifier les excès ou insuffisances de température ou mettre l'appareil en sécurité si nécessaire. A cet effet, la régulation doit recueillir et analyser à chaque instant en fonction des valeurs de consignes déterminées, des signaux caractéristiques d'écarts par rapport à ces valeurs, fournis par des capteurs.A regulation system must also ensure a safety function both at the time of ignition but also during operation by monitoring the temperature in various places of the appliance to correct excess or insufficient temperature or secure the device if necessary. To this end, the regulation must collect and analyze at each instant as a function of the determined setpoint values, characteristic signals of deviations from these values, supplied by sensors.

Ces fonctions -ainsi que celles assurant la commande du clapet inverseur pour la mise en oeuvre du circuit chauffage ou du circuit puisage- sont assuréespar des systèmes de régulation utilisant des circuits analogiques qui transforment les sianaux reçus de ces différents capteurs en variations de tension ou d'intensité lesquelles sont comparées aux valeurs de consigne dans un comparateur, puis amplifiées à l'aide d'un amplificateur dont la sortie aboutit à l'organe moteur par exemple l'électrovanne d'admission du gaz au brûleur.These functions - as well as those ensuring the control of the reversing valve for the implementation of the heating circuit or the drawing circuit - are ensured by regulation systems using analog circuits which transform the signals received from these different sensors into variations in voltage or d 'intensity which are compared with the set values in a comparator, then amplified using an amplifier whose output leads to the engine member for example the solenoid valve for the admission of gas to the burner.

Ces modes de réalisation connus présentent toutefois un certain nombre d'inconvénients. Tout d'abord ils utilisent un assez grand nombre de composants et nécessitent un montage particulier. En outre on sait que les valeurs de consignes sont données par les différents composants utilisés, résistances, capacités, etc... ; et si 3n veut modifier ces valeurs, il faudrait modifier ces composants. Ceci veut dire qu'une régulation analogique, une fois conçue pour un appareil avec des valeurs déterminées, ne peut s'adapter facilement à d'autres paramètres sans la modification des composants c'est-à-dire sans reprendre l'élaboration des circuits. C'est un inconvénient sérieux en fabrication car il est souvent nécessaire d'adapter dans le temps les appareils aux exigences et aux habitudes des usagers tout en tenant compte d'autres critères évolutifs -comme les économies d'énergies-, les nouvelles mesures de sécurité, etc... En outre, il serait difficile pour ce genre de régulation de prendre en compte certaines caractéristiques limites d'une installation de chauffage telle que fermeture éventuelle de tous les robinets thermostatiques équipant les radiateurs et en éviter leurs inconvénients par l'introduction automatique de temporisation sur certaines séquences du cycle de régulation.These known embodiments however have a number of drawbacks. First of all, they use a fairly large number of components and require a specific assembly. In addition, we know that the setpoint values are given by the different components used, resistances, capacities, etc ...; and if 3 n wants to modify these values, these components would have to be modified. This means that an analog control, once designed for a device with determined values, cannot easily adapt to other parameters without modifying the components, i.e. without resuming the development of the circuits. . This is a serious drawback in manufacturing because it is often necessary to adapt the devices over time to the requirements and habits of users while taking into account other evolving criteria - such as energy savings - the new measures safety, etc ... In addition, it would be difficult for this kind of regulation to take into account certain limiting characteristics of a heating installation such as possible closing of all the thermostatic valves equipping the radiators and to avoid their disadvantages by automatic introduction of timing on certain sequences of the regulation cycle.

L'invention propose un système de régulation à microprocesseur qui évite ces inconvénients et assure l'ensemble des fonctions de régulation et de sécurité, tout en permettant 1a vérification à chaque instant de la carte de régulation de l'appareil par simulation des commandes.The invention provides a microprocessor-based control system which avoids these drawbacks and provides all of the control functions. lation and safety, while allowing 1a verification at all times of the device regulation card by simulating commands.

Cette régulation à microprocesseur permet à l'inverse des systèmes connus, une adaptabilité des systèmes par un simple changement de mémoire sans toucher aux composants, elle fournit en outre une régulation à action proportionnelle intégrale et dérivée beaucoup plus fine et présente aussi des avantages sur le plan dimensionnel.Contrary to known systems, this microprocessor-based regulation allows systems to be adapted by a simple change of memory without touching the components, it also provides a much finer proportional and integral proportional action regulation and also has advantages over dimensional plan.

D'autres caractéristiques particulières et avantages de l'invention apparaîtront à la lecture de la description suivante d'un mode de réalisation et de fonctionnement dans lequel on se réfère à la représentation schématique jointe qui illustre cette régulation par microprocesseur.Other particular characteristics and advantages of the invention will appear on reading the following description of an embodiment and operation in which reference is made to the attached schematic representation which illustrates this regulation by microprocessor.

L'appareil représenté est constitué d'une enceinte étanche 1 dont le fond cla isole la partie étanche des mécanismes et organes ce régulation disposés à la partie inférieure, l'ensemble étant monté sur une même ossature non représentée.The device shown is made up of a sealed enclosure 1, the bottom of which isolates the sealed part from the mechanisms and members of this regulation arranged at the bottom, the assembly being mounted on the same frame, not shown.

Dans l'enceinte étanche 1, une hotte 2 d'évacuation des gaz brûlés en forme de L coiffe un bloc à ailettes 3 qui constitue le corps de chauffe de l'appareil, dont la jupe 4 canalise les gaz provenant des brûleurs 5. Sur la partie verticale de la hotte formant cheminée est monté un ventilateur d'extraction 6 dont le moteur d'entraine- ment 7 occupe l'espace ménagé entre la hotte et la partie supérieure de l'enceinte. Le ventilateur 6 extrait les gaz de combustion parun conduit d'évacuation 8 coaxial au condùit 9 d'admission d'air. Ce dernier débouche dans un boîtier répartiteur d'air 10 placé à la partie supérieure de l'enceinte étanche, lui-même en communication par un orifice 11 avec la chambre intérieure.In the sealed enclosure 1, an L-shaped exhaust gas exhaust hood 2 caps a fin block 3 which constitutes the heating body of the appliance, the skirt 4 of which channels the gases coming from the burners 5. On the vertical part of the chimney hood is fitted with an exhaust fan 6, the drive motor 7 of which occupies the space provided between the hood and the upper part of the enclosure. The fan 6 extracts the combustion gases via an exhaust pipe 8 coaxial with the air intake pipe 9. The latter opens into an air distributor housing 10 placed at the upper part of the sealed enclosure, itself in communication through an orifice 11 with the interior chamber.

Au-dessous du fond étanche la se situent les divers mécanismes de l'appareil : l'électrovalve 12 d'admission du gaz au brûleur alimentée par un conduit d'arrivée gaz 13, par l'intermédiaire d'un boîtier disjoncteur 14 qui assure également la mise sous tension électrique de la chaudière. On y trouve aussi le clapet inverseur 15 dont l'organe de fermeture non représenté distribue l'eau chaude primaire sortant de l'échangeur par le conduit 16, soit vers le départ chauffage 17, avec retour par le conduit 20 -soit vers un circuit court 18, une pompe 19 étant interposée sur le conduit commun 21 de retour à l'échangeur. Le circuit d'eau sanitaire alimenté par le tube d'arrivée 22 fournit l'eau aux points de puisage par le tube de départ d'eau sanitaire 23. En fin un allumeur 24 fournit un train d'étincelles à la veilleuse 25.Below the sealed bottom there are the various mechanisms of the apparatus: the solenoid valve 12 for admitting gas to the burner supplied by a gas inlet pipe 13, by means of a circuit breaker housing 14 which ensures also the electric powering of the boiler. There is also the reversing valve 15, the closing member of which is not shown distributes the primary hot water leaving the exchanger through the conduit 16, ie towards the hot start. fage 17, with return through the conduit 20 -or towards a short circuit 18, a pump 19 being interposed on the common conduit 21 returning to the exchanger. The domestic water circuit supplied by the inlet tube 22 supplies water to the draw-off points via the domestic water departure tube 23. At the end, an igniter 24 supplies a spark train to the pilot 25.

Le système de régulation à microprocesseur a pour but de commander des organes terminaux en fonction d'informations collectées par des capteurs. Le boîtier de régulation à microprocesseur 26 reçoit à cet effet des informations de capteurs de température tels que le thermostat d'ambiance 27 monté extérieurement à l'appareil et le capteur 28 de retour d'eau de chauffage monté sur le conduit 21. Les informations sont également reçues d'un capteur de flux d'air 29 monté sur l'orifice 11 d'admission d'air à l'intérieur de l'enceinte étanche à partir du boîtier répartiteur 10. Ces capteurs, sauf le thermostat d'ambiance, délivrent un signal analogique (tension variable en fonction de la grandeur à mesurer) qui doit être converti en valeurs digitales assimilables par le microprocesseur. En outre d'autres informations sont fournies par un capteur 30 monté sur le moteur 7 du ventilateur d'extraction. Ledit capteur détecte le passage de quatre aimants fixés sur le bout d'arbre du moteur ou encore d'un disque à encoches suivi par un lecteur optoélectrique et délivre un signal digital dont la fréquence est proportionnelle à la vitesse du moteur. De plus une information sur le puisage d'eau sanitaire est fournie par un contact puisage 31 disposé au niveau du clapet inverseur 15. Enfin un contact lié à l'allumeur 24 fournit au boîtier 26 une information sur le cycle d'allumage.The purpose of the microprocessor-based regulation system is to control terminal members as a function of information collected by sensors. The microprocessor control unit 26 receives for this purpose information from temperature sensors such as the room thermostat 27 mounted outside the device and the heating water return sensor 28 mounted on the duct 21. The information are also received from an air flow sensor 29 mounted on the air intake orifice 11 inside the sealed enclosure from the distributor housing 10. These sensors, except the room thermostat , deliver an analog signal (variable voltage depending on the quantity to be measured) which must be converted into digital values which can be assimilated by the microprocessor. In addition, other information is provided by a sensor 30 mounted on the motor 7 of the exhaust fan. Said sensor detects the passage of four magnets fixed on the end of the motor shaft or of a notched disc followed by an optoelectric reader and delivers a digital signal whose frequency is proportional to the speed of the motor. In addition, information on the drawing of sanitary water is provided by a drawing contact 31 disposed at the level of the reversing valve 15. Finally, a contact linked to the igniter 24 provides the housing 26 with information on the ignition cycle.

Les organes terminaux susceptibles d'être ainsi commandés par le système de régulation sont l'électrovalve gaz 12, la pompe de circulation d'eau 19, l'allumeur 24, et dans l'enceinte étanche de l'appareil le ventilateur d'extraction 6.The terminal members capable of being thus controlled by the regulation system are the gas solenoid valve 12, the water circulation pump 19, the igniter 24, and in the sealed enclosure of the device the exhaust fan. 6.

Lors de la mise sous tension de l'appareil, une première séquence d'initialisation a pour but de "faire apprendre" au microprocesseur le contexte dans lequel il va réguler la chaudière. Cette séquence est la suivante : - l'admission du gaz et l'allumeur 24 sont inhibés ; - le ventilateur d'extraction 6 est mis en fonctionnement à vitesse maximale puis le microprocesseur grâce au capteur 29 vient lire la valeur du débit d'air qui passe par l'orifice 11 du boîtier répartiteur 10 à la chambre intérieure de l'appareil. Cette valeur doit être égale à une valeur déterminée au-dessous de laquelle il y aurait défaut d'installation et arrêt de la programmation. Si cette valeur est donc normale, elle est mise en mémoire après calcul, comme étant la valeur minimale de flux correspondant au plein débit du ventilateur d'extraction. On fait ensuite passer ce ventilateur à 50 % de sa vitesse maximale et on effectue une nouvelle mesure de flux. La valeur mémorisée représente alors la valeur minimale de débit d'air pour le petit débit du ventilateur 6. Celui-ci est ensuite arrêté ; l'allumeur 24 est mis sous tension pour allumer la veilleuse 25. Le relâchement du bouton-poussoir au boîtier disjoncteur 14 termine cette séquence d'initialisatioh.When the device is powered up, a first initialization sequence aims to "teach" the microprocessor the context in which it will regulate the boiler. This sequence is as follows: - the gas inlet and the igniter 24 are inhibited; - The exhaust fan 6 is put into operation at maximum speed then the microprocessor thanks to the sensor 29 comes to read the value of the air flow rate which passes through the orifice 11 of the distributor box 10 to the interior chamber of the device. This value must be equal to a determined value below which there would be a failure to install and stop programming. If this value is therefore normal, it is stored in memory after calculation, as being the minimum flow value corresponding to the full flow rate of the exhaust fan. This fan is then passed to 50% of its maximum speed and a new flow measurement is carried out. The memorized value then represents the minimum value of air flow for the small flow of fan 6. This is then stopped; the igniter 24 is energized to light the pilot 25. The release of the push button at the circuit breaker box 14 completes this initialization sequence.

Ces deux mesures de flux ont pour but d'étalonner le capteur de débit d'air de façon à éliminer l'influence de la position de la ventouse. En cours de fonctionnement le microprocesseur vient lire périodiquement l'état des capteurs de température au thermostat d'ambiance 27 et au contact puisage 31. En l'absence d'ordre, la pompe de circulation 19 reste à l'arrêt et le ventilateur d'extraction ne se met en marche que de façon très intermittente (par exemple 15 secondes toutes les 5 minutes) et à vitesse réduite (50 % de la vitesse nominale) pour assurer l'alimentation en air de la veilleuse.The purpose of these two flow measurements is to calibrate the air flow sensor so as to eliminate the influence of the position of the suction cup. During operation, the microprocessor periodically reads the state of the temperature sensors at room thermostat 27 and at draw-off contact 31. In the absence of an order, the circulation pump 19 remains stopped and the fan d Extraction only starts very intermittently (for example 15 seconds every 5 minutes) and at reduced speed (50% of nominal speed) to ensure the air supply to the pilot.

Dès réception d'un ordre provenant du thermostat d'ambiance 27 c'est-à-dire dès que la température captée est au-dessous du seuil prédéterminé, et qu'il y a demande de calories, la pompe de circulation 19 se met en marche ; l'admission du gaz par l'électrovalve 12 et la vitesse du ventilateur d'extraction 6 sont alors modulés par le microprocesseur 26 afin d'assurer une proportionnalité constante du mélange air-gaz et de maintenir une température de retour de l'eau de chauffage par le conduit 20, égale à la température de consigne ajustée par l'utilisateur puisque la puissance est adaptable aux besoins de l'installation. En cas d'arrêt du brûleur 5, celui-ci ne pourra se rallumer avant un certain délai (de l'ordre de une minute par exemple) afin d'éviter des cycles trop répétés d'allumage et d'extinction. En outre pour éviter les surchauffes, la pompe et le ventilateur d'extraction seront maintenus en fonctionnement pendant quelques temps (par exemple 45 secondes) après arrêt du gaz et l'allumage du brûleur n'interviendra qu'en passant par une phase de petit débit afin d'assurer un allumage silencieux. A tout moment, le capteur de flux d'air 29 informe le microprocesseur 26 du débit d'air admis dans l'appareil par l'orifice 11. Si celui-ci est insu- fisant pour assurer la combustion correcte du gaz introduit, le débit de gaz sera alors réduit pour atteindre le mélange adapté à la combustion correcte.Upon receipt of an order from the room thermostat 27, that is to say as soon as the temperature sensed is below the predetermined threshold, and there is a demand for calories, the circulation pump 19 starts working ; the gas inlet by the solenoid valve 12 and the speed of the exhaust fan 6 are then modulated by the microprocessor 26 in order to ensure a constant proportionality of the air-gas mixture and to maintain a water return temperature of heating via line 20, equal to the set temperature adjusted by the user since the power is adaptable to the needs of the installation. In the event of burner 5 stopping, it will not be able to re-ignite before a certain delay (of the order of one minute for example) in order to avoid too repeated cycles of switching on and off. In addition to avoid overheating, the pump and the exhaust fan will be kept in operation for some time (for example 45 seconds) after the gas has stopped and the ignition of the burner will only take place through a small phase. flow to ensure silent ignition. At any time, the air flow sensor 29 informs the microprocessor 26 of the air flow admitted into the device through the orifice 11. If the latter is insufficient to ensure the correct combustion of the gas introduced, the gas flow will then be reduced to reach the mixture suitable for correct combustion.

Dès réception d'un ordre provenant du contact puisage 31 c'est-à-dire dès qu'il y a appel de calories lors d'un puisage de l'eau par l'usager, du fait que cet appel est prioritaire par rapport au chauffage, le microprocesseur régule alors le circuit (16, 21) primaire que le clapet inverseur 15 distribue par le circuit court 18. Cette régulation d'un principe analogue à celui du fonctionnement en chauffage se fait à une valeur de consigne fixe permettant d'obtenir une température satisfaisante sur le circuit secondaire de puisage.Upon receipt of an order from the drawing contact 31, that is to say as soon as there is a call for calories when the user draws water, because this call has priority over during heating, the microprocessor then regulates the primary circuit (16, 21) that the reversing valve 15 distributes via the short circuit 18. This regulation of a principle analogous to that of heating operation is done at a fixed setpoint value allowing '' obtain a satisfactory temperature on the secondary drawing-off circuit.

Ce système de régulation à microprocesseur prévoit aussi un programme de tests permettant de vérifier le fonctionnement de la carte de régulation hors de la chaudière en simulant les commandes envoyées aux organes terminaux en fonction d'informations appliquées aux entrées.This microprocessor-based control system also provides a test program making it possible to verify the operation of the control card outside the boiler by simulating the commands sent to the terminal members as a function of information applied to the inputs.

Claims (11)

1"/ Dispositif de régulation pour chaudière à gaz simple ou mixte à tirage forcé dans laquelle une enceinte étanche renferme un brûleur; un corps de chauffe; une hotte d'évacuation des gaz brûlés et un ventilateur d'extraction, l'air frais nécessaire à la combustion du brûleur étant admis à partir d'un boîtier répartiteur d'air disposé à la partie supérieure de ladite enceinte, ladite chaudière comportant une électrovalve d'admission gaz au brûleur reliée à un boîtier disjoncteur, un clapet inverseur distribuant l'eau primaire soit vers un circuit long lors du fonctionnement en chauffage, soit vers un circuit court lors d'un puisage, une pompe de circulation et un allumeur, la chaudière étant en outre munie d'une pluralité de capteurs ou de détecteurs destinés à recueillir des informations de température, de débit ou de fonctionnement, caractérisé par le fait que l'ensemble des fonctions de régulation , de sécurité et d'asservissement continu du débit d'air au débit de gaz est assuré par un boîtier de régulation (26) à microprocesseur qui centralise les informations reçues des différents capteurs, les convertit en signaux digitaux propres à faire fonctionner, l'allumeur (24), la pompe de circulation (19), l'électrovalve d'admission gaz (12) et le ventilateur d'extraction (6), selon les informations de régulation préprogrammées et mémorisées par le microprocesseur.1 "/ Control device for a single or mixed gas boiler with forced draft in which a sealed enclosure contains a burner; a heating body; a hood for evacuating burnt gases and an exhaust fan, fresh air required to the combustion of the burner being admitted from an air distributor box disposed at the upper part of said enclosure, said boiler comprising a solenoid valve for admitting gas to the burner connected to a circuit breaker box, a reversing valve distributing water primary either to a long circuit during heating operation, or to a short circuit during drawing, a circulation pump and an igniter, the boiler being further provided with a plurality of sensors or detectors intended to collect temperature, flow or operating information, characterized in that all of the regulation, safety and continuous control functions from the air flow to the gas flow are ensured p ar a microprocessor control unit (26) which centralizes the information received from the various sensors, converts it into digital signals suitable for operating, the igniter (24), the circulation pump (19), the intake solenoid valve gas (12) and the extractor fan (6), according to the preprogrammed regulation information stored by the microprocessor. 2°/ Dispositif de régulation selon la revendication 1 caractérisé par le fait que le boîtier de régulation (26) à microprocesseur est relié à au moins deux capteurs de température, l'un étant constitué du thermostat d'ambiance (27) et l'autre capteur (28) étant localisé sur le conduit (21) de retour d'eau de chauffage, qu'il est relié également à un capteur de débit d'air (29) monté sur l'orifice (11) de passage d'air du boîtier répartiteur (10), qu'il est relié également à un capteur de vitesse de rotation (30)11 monté sur le moteur (7) du ventilateur d'extraction (6), et qu'il est relié enfin à des contacteurs fournissant une première information sur le prélèvement d'eau sanitaire grâce à un contact puisage (31), disposé au niveau du clapet inverseur (15), et une seconde information sur le cycle d'allumage grâce à un contact sur l'allumeur (24).2 ° / control device according to claim 1 characterized in that the control box (26) with microprocessor is connected to at least two temperature sensors, one consisting of the room thermostat (27) and the other sensor (28) being located on the duct (21) for return of heating water, that it is also connected to an air flow sensor (29) mounted on the orifice (11) for passage of air from the distributor box (10), that it is also connected to a speed sensor (30) 11 mounted on the motor (7) of the exhaust fan (6), and that it is finally connected to contactors providing initial information on domestic water withdrawal through a contact drawing (31), placed at the level of the reversing valve (15), and a second information item on the ignition cycle by means of a contact on the igniter (24). 3°/ Dispositif de régulation selon les revendications 1 et 2 caractérisé par le fait que l'introduction des informations de régulation dans le microprocesseur est assuréelors de la mise sous tension de l'appareil par la mise en fonctionnement à vitesse maximale du ventilateur d'extraction (6) et la mise en mémoire de la valeur de débit d'air correspondant au plein débit enregistré par le capteur (29), suivie par la mise en fonctionnement dudit ventilateur à la vitesse réduite qui correspond au débit d'air nécessaire au fonctionnement du brûleur à sa puissance minimum de la plage de modulation prévue et la mise en mémoire de la valeur de ce débit d'air réduit.3 ° / regulation device according to claims 1 and 2 characterized in that the introduction of regulation information into the microprocessor is ensured when the power is turned on by the operation of the fan at maximum speed. extraction (6) and storage of the air flow value corresponding to the full flow recorded by the sensor (29), followed by the operation of said fan at the reduced speed which corresponds to the air flow required for operation of the burner at its minimum power from the expected modulation range and storage of the value of this reduced air flow. 4°/ Dispositif de régulation selon les revendications 1 et 2 caractérisé par le fait que le microprocesseur lit de façon périodique les informations de températures fournies par le thermostat d'ambiance (27) et de puisage fourni par le contact (31) avec une fréquence de lecture comprise entre 0,2 et 0,5 secondes .4 ° / regulation device according to claims 1 and 2 characterized in that the microprocessor periodically reads the temperature information provided by the room thermostat (27) and drawing provided by the contact (31) with a frequency reading between 0.2 and 0.5 seconds. 5°/ Dispositif de régulation selon les revendications 1 et 4 caractérisé par le fait qu'en l'absence d'ordre, la pompe de circulation (19) reste à l'arrêt et le ventilateur d'extraction (6) ne se met en marche que de façon très intermittente et à vitesse réduite pour assurer l'alimentation en air de la veilleuse.5 ° / regulating device according to claims 1 and 4 characterized in that in the absence of order, the circulation pump (19) remains stopped and the exhaust fan (6) does not start only very intermittently and at reduced speed to ensure the air supply to the pilot. 6°/ Dispositif de régulation selon les revendications 1 et 4 caractérisé par le fait que le microprocesseur commande de façon modulée l'ouverture de l'électrovalve (12) et la vitesse du ventilateur d'extraction (6), dès qu'une demande de calories est décelée par le thermostat d'ambiance (27), pour assurer une proportionnalité constante du mélange air-gaz et maintenir égale à la température de consigne la température de retour de l'eau de chauffage par le conduit (20).6 ° / regulation device according to claims 1 and 4 characterized in that the microprocessor modulates the opening of the solenoid valve (12) and the speed of the exhaust fan (6), as soon as a request of calories is detected by the room thermostat (27), to ensure constant proportionality of the air-gas mixture and maintain the return temperature of the heating water via the duct (20) equal to the set temperature. 7°/ Dispositif de régulation selon les revendications 1 et 4 caractérisé par le fait que le microprocesseur commande le basculement du clapet inverseur (15) qui distribue alors l'eau du circuit primaire (16, 21) dans le circuit court, dès qu'un prélèvement d'eau sanitaire est décelé par le contact de puisage (31), et régule la température de cette eau à une valeur de consigne fixe permettant d'obtenir une température satisfaisante sur le circuit secondaire de puisage.7 ° / regulating device according to claims 1 and 4 characterized in that the microprocessor controls the tilting of the reversing valve (15) which then distributes the water of the primary circuit (16, 21) in the short circuit, as soon as a withdrawal of sanitary water is detected by the draw-off contact (31), and regulates the temperature of this water to a fixed reference value making it possible to obtain a satisfactory temperature on the secondary circuit of drawing. 8°/ Dispositif de régulation selon les revendications 6 et 7 caractérisé par le fait qu'en cas d'arrêt du brûleur (5), le microprocesseur temporise son réallumage pour éviter des cycles répétés d'allumage et d'extinction.8 ° / regulating device according to claims 6 and 7 characterized in that in case of shutdown of the burner (5), the microprocessor delays its re-ignition to avoid repeated cycles of ignition and extinction. 9°/ Dispositif de régulation selon les revendications 6 et 7 caractérisé par 1-e fait que le microprocesseur commande le maintient en fonctionnement de la pompe de circulation (19) et du ventilateur d'extraction (6) pendant quelques temps après l'arrêt du brûleur.9 ° / regulating device according to claims 6 and 7 characterized by 1-e that the microprocessor controls keeps the circulating pump (19) and the exhaust fan (6) in operation for some time after stopping of the burner. 10°/ Dispositif de régulation selon la revendication 9 caractérisé par le fait que le microprocesseur n'assure le réallumage du brûleur qu'après une phase à petit débit afin d'assurer un allumage silencieux.10 ° / A regulation device according to claim 9 characterized in that the microprocessor ensures the re-ignition of the burner only after a phase at low flow rate to ensure silent ignition. 11°/ Dispositif de régulation selon la revendication 1 caractérisé par le fait qu'une simulation des commandes envoyées aux organes terminaux en fonction d'informations fournies aux entrées est appliquée à la régulation (26) à microprocesseur pour tester son bon fonctionnement.11 ° / A regulation device according to claim 1 characterized in that a simulation of the commands sent to the terminal organs as a function of information supplied to the inputs is applied to the regulation (26) with microprocessor to test its correct operation.
EP82401584A 1981-08-27 1982-08-26 Tight forced-draught burner with microprocessor regulation Expired EP0073717B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401584T ATE20381T1 (en) 1981-08-27 1982-08-26 TIGHT GAS BOILER WITH FORCED DRAW AND MICROPROCESSOR CONTROL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8116373A FR2512179A1 (en) 1981-08-27 1981-08-27 FORCE DRAFT DRY GAS BOILER WITH MICROPROCESSOR CONTROL
FR8116373 1981-08-27

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EP0073717A1 true EP0073717A1 (en) 1983-03-09
EP0073717B1 EP0073717B1 (en) 1986-06-11

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EP (1) EP0073717B1 (en)
JP (1) JPH0660737B2 (en)
AT (1) ATE20381T1 (en)
DE (1) DE3271661D1 (en)
ES (1) ES8305484A1 (en)
FR (1) FR2512179A1 (en)

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CN106766186B (en) * 2016-12-26 2022-06-21 广东万家乐燃气具有限公司 Hot water circulating device with straight-flow pump and control system thereof

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Cited By (15)

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FR2549941A1 (en) * 1983-07-29 1985-02-01 Sdecc Safety device for a gas apparatus for heating and for producing hot water with controlled mechanical ventilation.
FR2594524A1 (en) * 1986-02-18 1987-08-21 Rinnai Kk DEVICE FOR CONTROLLING COMBUSTION
GB2187000A (en) * 1986-02-18 1987-08-26 Rinnai Kk Burner control
EP0279771A1 (en) * 1987-02-07 1988-08-24 Joh. Vaillant GmbH u. Co. Method for regulating the flow of combustion air in a fuel-heated heat source
EP0375494B1 (en) * 1988-12-20 1994-03-23 Les Fonderies Franco-Belges Automatic regulation method and apparatus for a discontinuously solid fuel-fired boiler using forced draft, particularly for a wood-fired boiler
EP0478510A1 (en) * 1990-09-28 1992-04-01 INECO S.r.l. Process and apparatus for controlling the comburent/combustible ratio, particularly in boilers
EP0612960A1 (en) * 1993-02-26 1994-08-31 General Electric Company Draft inducer air flow control
US5418438A (en) * 1993-02-26 1995-05-23 General Electric Company Draft inducer air flow control
US5557182A (en) * 1993-02-26 1996-09-17 General Electric Company System and methods for controlling a draft inducer to provide a desired operating area
EP0614047A1 (en) * 1993-03-05 1994-09-07 Landis & Gyr Technology Innovation AG Electronic control device for gas burners of heating installations
EP0857916A1 (en) 1997-02-06 1998-08-12 Electrowatt Technology Innovation AG Control device for a burner
CN106403292A (en) * 2016-09-05 2017-02-15 广东万家乐燃气具有限公司 Hot-water circulation device with direct-flow pump
CN106403292B (en) * 2016-09-05 2019-06-04 广东万家乐燃气具有限公司 A kind of hot water circulating device with straightway pump
CN110388739A (en) * 2019-07-05 2019-10-29 广东万家乐燃气具有限公司 A kind of igniting feedback needle, burner and gas and hot water equipment
CN110388739B (en) * 2019-07-05 2021-05-14 广东万家乐燃气具有限公司 Ignition feedback needle, combustor and gas hot water equipment

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US4519540A (en) 1985-05-28
FR2512179A1 (en) 1983-03-04
DE3271661D1 (en) 1986-07-17
JPH0660737B2 (en) 1994-08-10
ES515288A0 (en) 1983-05-01
ATE20381T1 (en) 1986-06-15
JPS5886323A (en) 1983-05-23
EP0073717B1 (en) 1986-06-11
ES8305484A1 (en) 1983-05-01
FR2512179B1 (en) 1983-12-09

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