EP0432020B1 - Air-tight heater with forced draft using an anti-condensation thermocontact - Google Patents

Air-tight heater with forced draft using an anti-condensation thermocontact Download PDF

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Publication number
EP0432020B1
EP0432020B1 EP19900403388 EP90403388A EP0432020B1 EP 0432020 B1 EP0432020 B1 EP 0432020B1 EP 19900403388 EP19900403388 EP 19900403388 EP 90403388 A EP90403388 A EP 90403388A EP 0432020 B1 EP0432020 B1 EP 0432020B1
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EP
European Patent Office
Prior art keywords
boiler
thermocontact
heating
burner
fan
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 - Lifetime
Application number
EP19900403388
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German (de)
French (fr)
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EP0432020A1 (en
Inventor
André De Lannoy
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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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/0036—Dispositions against condensation of combustion products

Definitions

  • the invention lies in the technical field of gas tight boilers with forced draft and relates more precisely to the particular arrangement of a thermal switch intended to avoid the problems of condensation at the level of its exchanger and of the instability of the pilot light due to pollution of the combustion chamber.
  • the invention aims to solve this problem by looking for intermittent operation of the exhaust fan. For this it appeared necessary to guarantee the operation of the fan at low speed when the heating body is cold and at a temperature below the temperature of the dew point of the combustion products, and on the contrary to keep the said fan stopped for higher temperatures, in areas where the losses when the boiler is shut down would be too great.
  • a main object of the present invention consists of a sealed gas boiler with forced draft in which a sealed enclosure contains a burner and its pilot light, a heating body, a hood for evacuating burnt gases and a extraction fan, and which comprises a solenoid valve for gas intake to the burner connected to a circuit breaker box, possibly an inverter valve distributing the primary water either to a long circuit during heating operation with return by a first conduit, or towards a short circuit when drawing sanitary water with a circulation pump interposed on a second return pipe to the exchanger, boiler in which a thermal switch disposed on the first return pipe for the heating water is mounted in series with a half-speed resistance on a power supply phase of the exhaust fan.
  • the thermal switch is placed upstream of the reversing valve on the return pipe of the heating circuit.
  • the invention also relates to the choice of the set temperature of the thermal switch for the intermittent operation of the exhaust fan when the burner is at a standstill and thus avoid inadvertent locking out of the appliance.
  • the device shown consists of a sealed enclosure 1 at its upper part, which contains a burner 2, a fin block 3 constituting the heating body or exchanger, a hood 4 for collecting the burnt gases equipped with a fan d extraction 5, and a duct 6 for evacuating the combustion products to the outside. Coaxial with this duct, the sealed enclosure is crossed by a pipe 7 for fresh air intake.
  • an electrovalve 8 for admitting gas to the burner supplied by a gas inlet pipe 9, by means of a circuit breaker box. 10 which also ensures the electrical powering of the boiler.
  • the closing member 12 distributes the primary hot water leaving the exchanger through the conduit 13, or by a long circuit to the heating flow 14 with return by the first conduit 15, that is to a short circuit 16, a circulation pump 17 being interposed on the second conduit 18 for return to the exchanger.
  • the domestic water circuit supplied by the inlet tube 19 supplies water to the draw-off points via the domestic water departure tube 20.
  • the exhaust fan 5 is connected to the electrical terminals of the circuit breaker box 10, one of the phases being supplied in series via a half-speed resistor 21 of the extractor and a thermal switch 22 which is arranged on the first return pipe 15 of the heating water upstream of the reversing valve 11, a thermal switch which is intended to avoid the problems of condensation at the exchanger.
  • thermoswitch 22 on the first heating return pipe 15 upstream of the reversing valve 11, where there is the lowest temperature of the heating circuit loop, makes it possible to choose a most set temperature close to that of the dew point and to minimize losses when the boiler stops.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Regulation And Control Of Combustion (AREA)

Description

L'invention se situe dans le domaine technique des chaudières étanches à gaz à tirage forcé et concerne plus précisément la disposition particulière d'un thermocontact destiné à éviter les problèmes de condensation au niveau de son échangeur et de l'instabilité de la veilleuse due à une pollution de la chambre de combustion.The invention lies in the technical field of gas tight boilers with forced draft and relates more precisely to the particular arrangement of a thermal switch intended to avoid the problems of condensation at the level of its exchanger and of the instability of the pilot light due to pollution of the combustion chamber.

Jusqu'à présent les chaudières étanches à veilleuse sont équipées d'un ventilateur d'extraction qui tourne en permanence, à régime normal quand le brûleur est allumé ou à bas régime quand le brûleur est éteint mais la veilleuse toujours allumée. On sait que ce ventilateur permet l'admission d'air frais à l'intérieur de l'enceinte étanche de la chaudière en même temps que l'évacuation des produits de combustion vers l'extérieur. Ce fonctionnement permanent à bas régime du ventilateur d'extraction résulte de la nécessité d'assurer une circulation minimum permanente d'air frais à l'intérieur de l'appareil, même lorsqu'il n'y a pas de demande de calories et que le brûleur principal est éteint. En effet s'il n'y avait pas ce passage continu d'air, lorsque la température de l'échangeur est à une température inférieure à celle correspondant au point de rosée des produits de combustion de la veilleuse, il y aurait alors formation de condensation au niveau du corps de chauffe, avec les problèmes que cela pose d'écoulement et de corrosion. De plus la veilleuse risque de s'éteindre intempestivement par décollement de la flamme due à la présence des produits de combustion de la veilleuse qui ne peuvent s'évacuer et polluer ainsi la chambre de combustion. Cette mise en sécurité intempestive nuirait à la qualité de service de l'appareil.Up to now, sealed pilot boilers have been fitted with an exhaust fan that runs continuously, at normal speed when the burner is on or at low speed when the burner is off but the pilot always on. It is known that this fan allows the admission of fresh air inside the sealed enclosure of the boiler at the same time as the evacuation of the combustion products to the outside. This continuous operation at low speed of the exhaust fan results from the need to ensure a minimum permanent circulation of fresh air inside the appliance, even when there is no demand for calories and when the main burner is off. Indeed, if there was not this continuous passage of air, when the temperature of the exchanger is at a temperature lower than that corresponding to the dew point of the combustion products of the pilot, there would then be condensation at the level of the heating body, with the problems that this poses of flow and corrosion. In addition, the pilot may accidentally go out by detaching the flame due to the presence of the combustion products of the pilot which cannot escape and thus pollute the combustion chamber. This untimely lockout would adversely affect the quality of service of the device.

Néanmoins cette circulation permanente d'air frais dans l'échangeur présente l'inconvénient de refroidir celui-ci et d'augmenter les pertes à l'arrêt de la chaudière.However, this permanent circulation of fresh air in the exchanger has the drawback of cooling the latter and increasing the losses when the boiler stops.

Dans les DE-A-3 204 656 et EP-A-0 011 568 sont décrites des chaudières étanches à veilleuse.In DE-A-3 204 656 and EP-A-0 011 568, sealed boiler with pilot lights are described.

Il serait donc souhaitable de pouvoir concilier deux exigences. D'une part éviter la condensation par un brassage d'air dans l'échangeur, qui de surcroît, en cas d'arrêt du brûleur, empêche l'extinction de la veilleuse due à la pollution de la chambre de combustion. D'autre part éviter les pertes à l'arrêt en stoppant le fonctionnement de cette circulation d'air.It would therefore be desirable to be able to reconcile two requirements. On the one hand, avoid condensation by circulating air in the exchanger, which in addition, in the event of the burner stopping, prevents the pilot from going out due to pollution of the combustion chamber. On the other hand, avoid standstill losses by stopping the functioning of this air circulation.

L'invention vise à résoudre ce problème par la recherche d'une intermittence du fonctionnement du ventilateur d'extraction. Pour cela il est apparu nécessaire de garantir le fonctionnement du ventilateur à bas régime lorsque le corps de chauffe est froid et à une température inférieure à la température du point de rosée des produits de combustion, et au contraire de maintenir l'arrêt dudit ventilateur pour des températures plus élevées, dans des domaines où les pertes à l'arrêt de chaudière seraient trop importantes.The invention aims to solve this problem by looking for intermittent operation of the exhaust fan. For this it appeared necessary to guarantee the operation of the fan at low speed when the heating body is cold and at a temperature below the temperature of the dew point of the combustion products, and on the contrary to keep the said fan stopped for higher temperatures, in areas where the losses when the boiler is shut down would be too great.

Cette intermittence de fonctionnement est obtenue par un choix et un positionnement judicieux d'un thermocontact, objet de l'invention.This operating intermittence is obtained by a judicious choice and positioning of a thermal switch, object of the invention.

Aussi, un objet principal de la présente invention, consiste en une chaudière étanche à gaz à tirage forcé dans laquelle une enceinte étanche renferme un brûleur et sa veilleuse d'allumage, un corps de chauffe, une hotte d'évacuation des gaz brûlés et un ventilateur d'extraction, et qui comporte une électrovalve d'admission gaz au brûleur reliée à un boîtier-disjoncteur, éventuellement un clapet inverseur distribuant l'eau primaire soit vers un circuit long lors du fonctionnement en chauffage avec retour par un premier conduit, soit vers un circuit court lors du puisage d'eau sanitaire avec une pompe de circulation interposée sur un second conduit de retour à l'échangeur, chaudière dans laquelle un thermocontact disposé sur le premier conduit de retour de l'eau de chauffage est monté en série avec une résistance demi-régime sur une phase d'alimentation électrique du ventilateur d'extraction.Also, a main object of the present invention consists of a sealed gas boiler with forced draft in which a sealed enclosure contains a burner and its pilot light, a heating body, a hood for evacuating burnt gases and a extraction fan, and which comprises a solenoid valve for gas intake to the burner connected to a circuit breaker box, possibly an inverter valve distributing the primary water either to a long circuit during heating operation with return by a first conduit, or towards a short circuit when drawing sanitary water with a circulation pump interposed on a second return pipe to the exchanger, boiler in which a thermal switch disposed on the first return pipe for the heating water is mounted in series with a half-speed resistance on a power supply phase of the exhaust fan.

Avantageusement, le thermocontact est placé à l'amont du clapet inverseur sur le conduit retour du circuit chauffage.Advantageously, the thermal switch is placed upstream of the reversing valve on the return pipe of the heating circuit.

L'invention vise également au choix de la température de consigne du thermocontact pour la mise en fonctionnement intermittent du ventilateur d'extraction lorsque le brûleur est à l'arrêt et ainsi éviter une mise en sécurité intempestive de l'appareil.The invention also relates to the choice of the set temperature of the thermal switch for the intermittent operation of the exhaust fan when the burner is at a standstill and thus avoid inadvertent locking out of the appliance.

Les caractéristiques particulières de l'invention ressortiront de la description qui va suivre d'une forme de réalisation faisant référence à la figure unique qui représente schématiquement les éléments constitutifs essentiels d'une chaudière étanche.The particular characteristics of the invention will emerge from the description which follows of an embodiment referring to the single figure which schematically represents the essential constituent elements of a sealed boiler.

L'appareil représenté est constitué d'une enceinte étanche 1 à sa partie supérieure, qui renferme un brûleur 2, un bloc à ailettes 3 constituant le corps de chauffe ou échangeur, une hotte 4 de recueil des gaz brûlés équipée d'un ventilateur d'extraction 5, et un conduit 6 d'évacuation des produits de combustion vers l'extérieur. Coaxialement à ce conduit, l'enceinte étanche est traversée par une tubulure 7 d'admission d'air frais.The device shown consists of a sealed enclosure 1 at its upper part, which contains a burner 2, a fin block 3 constituting the heating body or exchanger, a hood 4 for collecting the burnt gases equipped with a fan d extraction 5, and a duct 6 for evacuating the combustion products to the outside. Coaxial with this duct, the sealed enclosure is crossed by a pipe 7 for fresh air intake.

Au-dessous de l'enceinte étanche, se situent les divers mécanismes de l'appareil : une électrovalve 8 d'admission du gaz au brûleur alimentée par un conduit d'arrivée de gaz 9, par l'intermédiaire d'un boîtier-disjoncteur 10 qui assure également la mise sous tension électrique de la chaudière. On y trouve aussi dans les chaudières avec production d'eau chaude sanitaire un clapet inverseur 11 dont l'organe de fermeture 12 distribue l'eau chaude primaire sortant de l'échangeur par le conduit 13, soit par un circuit long vers le départ chauffage 14 avec retour par le premier conduit 15, soit vers un circuit court 16, une pompe de circulation 17 étant interposée sur le second conduit 18 de retour à l'échangeur. Le circuit d'eau sanitaire alimenté par le tube d'arrivée 19 fournit l'eau aux points de puisage par le tube de départ d'eau sanitaire 20.Below the sealed enclosure, there are the various mechanisms of the apparatus: an electrovalve 8 for admitting gas to the burner supplied by a gas inlet pipe 9, by means of a circuit breaker box. 10 which also ensures the electrical powering of the boiler. Also found in boilers with domestic hot water production a reversing valve 11, the closing member 12 distributes the primary hot water leaving the exchanger through the conduit 13, or by a long circuit to the heating flow 14 with return by the first conduit 15, that is to a short circuit 16, a circulation pump 17 being interposed on the second conduit 18 for return to the exchanger. The domestic water circuit supplied by the inlet tube 19 supplies water to the draw-off points via the domestic water departure tube 20.

Le ventilateur d'extraction 5 est raccordé aux bornes électriques du boîtier-disjoncteur 10, une des phases étant alimentée en série par l'intermédiaire d'une résistance demi-régime 21 de l'extracteur et d'un thermocontact 22 qui est disposé sur le premier conduit de retour 15 de l'eau de chauffage en amont du clapet inverseur 11, thermocontact qui est destiné à éviter les problèmes de condensation au niveau de l'échangeur.The exhaust fan 5 is connected to the electrical terminals of the circuit breaker box 10, one of the phases being supplied in series via a half-speed resistor 21 of the extractor and a thermal switch 22 which is arranged on the first return pipe 15 of the heating water upstream of the reversing valve 11, a thermal switch which is intended to avoid the problems of condensation at the exchanger.

Le choix de placer ce thermocontact 22 sur le premier conduit 15 de retour de chauffage à l'amont du clapet inverseur 11, là où on a la température la plus basse de la boucle du circuit chauffage, permet de choisir une température de consigne la plus proche de celle du point de rosée et de diminuer au maximum les pertes à l'arrêt de la chaudière.The choice of placing this thermoswitch 22 on the first heating return pipe 15 upstream of the reversing valve 11, where there is the lowest temperature of the heating circuit loop, makes it possible to choose a most set temperature close to that of the dew point and to minimize losses when the boiler stops.

Grâce à cette disposition particulière, on peut brasser de l'air dans l'enceinte étanche, pour des faibles températures, c'est-à-dire quand il y a alors le plus de différence entre la température du corps de chauffe 3 et celle du point de rosée des produits de combustion de la veilleuse, et par conséquent le plus de condensation. Par contre on ne brasse plus l'air à plus forte tempérture quand il y a moins de différence entre ces températures et donc moins de condensation, mais dans une zone de température où les pertes à l'arrêt seraient plus importantes.Thanks to this particular arrangement, it is possible to stir air in the sealed enclosure, for low temperatures, that is to say when there is then the most difference between the temperature of the heating body 3 and that the dew point of the combustion products from the pilot, and therefore the most condensation. On the other hand, the air is no longer stirred at a higher temperature when there is less difference between these temperatures and therefore less condensation, but in a temperature zone where the standstill losses would be greater.

Claims (3)

  1. A gas-tight boiler with forced draft, wherein a leak-proof shell (1) contains a burner (2) and its pilot burner, a heating body, a hood (4) for evacuating the burnt gases and an extractor fan (5), and which includes an electrovalve (8) for admitting gas to the burner connected to a circuit breaker box (10), a change-over valve (11) dispensing the primary water either to a long circuit during the heating operation with a return via a first pipe (15), or to a short circuit (16) when domestic water is drawn, with a circulating pump (17) interposed in a second pipe (18) for the return to the exchanger, characterized in that a thermocontact (22) disposed in the first return pipe (15) for the heating water is mounted in series with a half load resistor (21) to a phase of the electric power supply of the extractor fan (5).
  2. A boiler according to claim 1, characterized in that the thermocontact (22) is placed in the first return pipe (15) of the heating circuit, upstream from the optional changeover valve (11), so as to maintain the low speed operation of the extractor fan (5) when the heating body is cold and at a temperature lower than the dew point temperature of the combustion products of the pilot burner, and on the other hand to stop and maintain the stoppage of the said fan (5) for higher temperatures, in the ranges where the losses at the stopping of the boiler would be too high.
  3. A boiler according to claims 1 and 2, characterized in that the choice of the set point temperature of the thermocontact (22) creates an intermittent operation of the fan (5) preventing a prolonged stoppage of the latter, and thus pollution of the combustion chamber of the boiler producing an inopportune safety protection of the appliance by the cut-off of the pilot burner.
EP19900403388 1989-12-04 1990-11-29 Air-tight heater with forced draft using an anti-condensation thermocontact Expired - Lifetime EP0432020B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8915958 1989-12-04
FR8915958A FR2655410B1 (en) 1989-12-04 1989-12-04 WATERPROOF GAS WATERPROOF BOILER USING AN ANTI-CONDENSATION THERMOCONTACT.

Publications (2)

Publication Number Publication Date
EP0432020A1 EP0432020A1 (en) 1991-06-12
EP0432020B1 true EP0432020B1 (en) 1993-02-17

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ID=9388095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900403388 Expired - Lifetime EP0432020B1 (en) 1989-12-04 1990-11-29 Air-tight heater with forced draft using an anti-condensation thermocontact

Country Status (4)

Country Link
EP (1) EP0432020B1 (en)
DE (1) DE69000932T2 (en)
ES (1) ES2038871T3 (en)
FR (1) FR2655410B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111780400A (en) * 2020-08-17 2020-10-16 优艾特仪表科技成都有限公司 Gas-electricity hybrid wall-mounted furnace and working method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2441799A1 (en) * 1978-11-15 1980-06-13 Saunier Duval IMPROVEMENT IN APPLIANCES FOR DOMESTIC USE OF GAS OF THE WATERPROOF TYPE WITH FORCED DRAFT
DE3204656C2 (en) * 1982-02-10 1984-08-02 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Fuel-heated heat source
NL8800313A (en) * 1988-02-09 1989-09-01 Wetering Gemeenschappelijk Bez Central heating boiler arrangement - has short circuit arrangement for combustion air supply to exhaust gas discharge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111780400A (en) * 2020-08-17 2020-10-16 优艾特仪表科技成都有限公司 Gas-electricity hybrid wall-mounted furnace and working method thereof

Also Published As

Publication number Publication date
ES2038871T3 (en) 1993-08-01
DE69000932T2 (en) 1993-06-03
FR2655410B1 (en) 1992-04-03
EP0432020A1 (en) 1991-06-12
FR2655410A1 (en) 1991-06-07
DE69000932D1 (en) 1993-03-25

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