EP0635679B1 - Injection and control device for atmospheric gas burners of heating appliances, in particular the infrared type - Google Patents

Injection and control device for atmospheric gas burners of heating appliances, in particular the infrared type Download PDF

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Publication number
EP0635679B1
EP0635679B1 EP94202045A EP94202045A EP0635679B1 EP 0635679 B1 EP0635679 B1 EP 0635679B1 EP 94202045 A EP94202045 A EP 94202045A EP 94202045 A EP94202045 A EP 94202045A EP 0635679 B1 EP0635679 B1 EP 0635679B1
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Prior art keywords
injector
injection
gas
valve
stage
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German (de)
French (fr)
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EP0635679A1 (en
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Joseph Strand
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Centre dEtude et de Realisations dEquipment et de Materiel CEREM
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Centre dEtude et de Realisations dEquipment et de Materiel CEREM
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/007—Regulating fuel supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14642—Special features of gas burners with jet mixers with more than one gas injection nozzles or orifices for a single mixing tube
    • 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
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • 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
    • F23N2235/18—Groups of two or more valves
    • 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
    • F23N2235/20—Membrane valves
    • 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
    • F23N2235/24—Valve details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/02—Controlling two or more burners

Definitions

  • the invention relates to a device injection and regulation between a minimum power, called idling, and a maximum power, called nominal, for atmospheric gas burner for heating appliances, in particular of the infrared type, comprising a pipe air inlet with an air inlet mouth and of a Venturi element.
  • This device is also of the type comprising gas injection means connected to gas supply pipe means, arranged in the air supply line from each burner, upstream of the Venturi element, and means for regulating the quantity of gas delivered to the injection means.
  • a such a device is, moreover, particularly suitable for equip heating appliances called to operate at low nominal pressure.
  • the burners operating at low pressure i.e. at a pressure generally less than 500 mbar, are affected by a deterioration in the quality of combustion if the supply pressure drops below the value nominal for which they were designed.
  • low pressure is, for example, a device operating at a nominal pressure of 350 mbar for which the intake of aspirated air and the injection of gas delivered by the injector do not remain proportional to a pressure range falling below 50% of the nominal speed.
  • the present invention aims to solve this problem and has as its main objective to provide a injection and regulation device allowing keep good carburetion of atmospheric burners with gas intended to operate in nominal low mode pressure when you want to adjust their diet to a minimum idle from nominal pressure.
  • a second stage injector is intended to include devices comprising several stages, and / or devices with several injectors per stage).
  • the principle of the invention is therefore to provide several injectors used in cascade, reducing the caliber of the respective injectors for a given quantity of gas delivered, and leading to an increase in the speed of ejection of the gas flow and improved air suction effect at the entrance to the Venturi element.
  • one of the injectors is arranged in the axis of the pipe air supply, each of the other injectors being inclined with respect to said axis so as to converge on the latter.
  • At least one of the second stage injectors is mounted on an injector tube housing a needle having a tapered end of section adapted for penetrate the injection nozzle, said needle being associated with actuating means able to move it from so as to bring it either into a closed position of the gas supply to the injector, either in regulation positions where it generates variations in flow functions of its position.
  • Such a provision makes it possible to generate progressive opening and closing of the nozzle second stage injectors and get optimal gas ejection speed for all diets.
  • At least one of the injectors of the second stage is advantageously mounted on an injector tube housing a needle with a tapered end of section suitable for entering the injection nozzle, the injector tube being associated with a valve provided with a movable member, and the needle being integral with the member mobile of said valve and coming in the extension of the latter, so as to bring said needle into regulation positions where it generates variations in flow functions of its position.
  • this provision allows to gradually close and open injection nozzles and optimize the ejection speed gases.
  • the regulation means are of the type individual and include a valve controlled from gas flow regulation, associated with each burner heater, and connected to a pipe main gas supply.
  • the idle pre-injector allows create, when the controlled valve is closed, a loss of charge allowing a pressure corresponding to the minimum idle speed of the associated burner.
  • this pre-injector is preferably a conventional type injector comprising a body forming a plug with an orifice injection, towards one of its ends, said injector being positioned "head to tail" so that the gas penetrates through the injection port.
  • This second embodiment constitutes a more economical solution than the one described above because it removes the shutter valves from second stage injectors, this economic gain being however obtained at the expense of a slight drop in performance at the end of closing or at the start of opening of the controlled valve.
  • the position of the first stage injector must be adapted to the fact that said injector, on the one hand, is supplied with a fixed gas pressure corresponding to nominal pressure and, on the other hand, must provide a injection rate corresponding to the minimum speed of slow motion.
  • a first advantageous solution aimed at meeting these requirements consists in making a device comprising a second stage injector arranged in the axis of the air supply pipe, and a first stage inclined with respect to said axis so as to converge towards the latter, and positioned so that its injection nozzle is offset longitudinally towards the front versus that of the second injector floor.
  • Another solution is to perform a device comprising a second stage injector arranged in the axis of the air supply pipe, and a first stage injector inclined with respect to said axis of so as to converge towards the latter, and positioned so its injection nozzle is offset longitudinally towards rear compared to that of the second injector floor, said device then comprising an obstacle arranged to intercept the flow of gas delivered by the first stage injector.
  • This second solution which consists of adjust the gas ejection speed by interposing a obstacle in the path of the gas jet in order to slow down its speed and change, by decreasing, the amount of air driven, is the most advantageous.
  • the obstacle can be made of very simple way, for example by means of a screw making protrusion inside the air supply pipe, and its position can be adjusted very easily up to obtaining optimal operating conditions.
  • Injection and regulation according to the invention are shown in figures associated with heaters 1 to infrared as used in the agricultural sector for heating of livestock buildings.
  • such heaters 1 include in the first place a reflector 2 in the form of a dome intended to be suspended above the chosen location using for example a chain 3, and containing the diffusion, combustion and radiation organs (of such bodies, not shown, may in particular be of the type of those described in patent US 5060629 in the name of depositor).
  • Each heater 1 comprises, in in addition, a supply line for air / gas mixture consisting of a bent pipe provided, so classic, a venturi element 5 and a mouthpiece inlet 6 for primary combustion air.
  • This heater 1 comprises, also, conventionally, a safety valve 7 connected to a gas supply pipe 8 for said gas device, and the output of which is connected to means of gas injection arranged upstream of the venturi element 5 and described below.
  • such devices for heating 1 are intended to operate in nominal mode low pressure with possibility of modulation of their speed up to a minimum idle speed.
  • the means of regulation allowing this modulation are either centralized ( Figures 1, 2, 3, 4, 9, 10) and therefore common to several heaters, i.e. individual and composed of a controlled regulation valve the gas flow rate associated with each appliance ( Figures 5 to 8).
  • Figure 1 shows a installation with centralized regulation means, comprising a main supply line 9 on which are connected supply lines 8 gas from heaters.
  • These centralized means of regulation are typically consist of a control panel 10 with thermostatic valve or power regulator slaved to a servo motor, the whole being arranged in parallel to a branch line 11 on which is arranged an idle pressure reducer 12.
  • each heater has a first stage injector 13 connected directly to a safety valve 7 outlet and arranged to extend in line with the pipe 4.
  • This heater comprises, in in addition, a second stage injector 14 inclined relative to to the axis of the pipe and set back relative to to the first stage injector 13.
  • This injector 14 is connected to a second outlet of the safety valve 7 via a branch line 15 on which is mounted a membrane valve 16.
  • This injector second floor 14 is, moreover, directly secured to an internal protuberance 17 of the pipe 4, pierced with a gas supply bore 18.
  • the diaphragm valve 16 whose design will be described later with reference to Figure 12, is conventionally adapted to seal the pipe of bypass 15 when the gas pressure in this the latter becomes below a predetermined threshold.
  • One such embodiment is particularly suitable for heating installations with a nominal supply pressure greater than 100 mbar, with a possible pressure variation between 20 mbar and nominal power.
  • the first stage injector 13 is calibrated to give a injection rate suitable for a pressure of 20 mbar.
  • FIG. 5 to 8 are for heaters with their own individual regulatory body, consisting of a thermostatic valve whose design will be described later with reference to Figure 11.
  • the thermostatic valve 19 is disposed upstream of the safety valve 7.
  • the pipe gas supply 8 has a bypass section 20 comprising an idling pre-injector 21.
  • Such an idle pre-injector 21 is designed to create when the thermostatic valve 19 is closed, a pressure drop allowing a pressure corresponding to the minimum idling speed.
  • the pre-injector 21 furthermore consists of an injector classic positioned "head to tail" so that the gas enters through its injection port.
  • the injectors are arranged identically to those of the heater of figure 4: the injector of first stage 22 is connected directly to the valve safety 7 and extends in the axis of the pipe, and the second stage injector 23 is inclined relative to said axis, and connected to the safety valve 7 by a bypass line 24 comprising a membrane valve 25.
  • One such embodiment is particularly suitable for heating installations whose nominal supply pressure is greater than 150 mbar, with a possible variation between 20 mbar and the nominal power.
  • the first stage injector 22 is calibrated to give an injection rate appropriate to the pressure supplied by the pre-injector 21.
  • the thermostatic valve 26 is disposed downstream of the safety valve 7.
  • the first stage injector 27 is directly connected to one of the valve outputs safety 7 by a bypass line 28 and is located arranged in place of the second stage injector (14 or 23) of the preceding variants, that is to say inclined relative to the axis of the pipe, and set back by compared to the second stage injector 29 which extends to it in line with the pipe.
  • an obstacle 30, consisting of a screw protruding inside the pipe, is arranged to intercept the flow of gas delivered by this injector in order to slow down the speed of the gas jet and decrease the amount of air entrained by the latter.
  • the first stage injector 27 can be adapted to have a length such that its injection nozzle is arranged in front of that of the second stage injector 29. In this case the obstacle 30 is useless.
  • One such embodiment is particularly suitable for heating installations whose nominal supply pressure is between 100 and 150 mbar, and is a solution particularly economical.
  • the first stage injector 31 is similar to that of the previous embodiment, that is to say connected directly to the safety valve 7 by a bypass line 32, inclined at an angle relative to the axis of the pipe, set back from the second stage injector 33, and associated with an obstacle 34 intercepting the gas flow.
  • the second stage injector 33 extends meanwhile in line with the pipe and is mounted on the end of an injector holder tube 35, secured to its other end on the valve body 36 thermostatic 37, as shown in FIG. 8.
  • This injector holder tube 35 also houses a needle 38 having a tapered section end suitable for entering the injection nozzle of the injector 33, so as to generate variations in flow functions of the relative position of said end tapered relative to said injection nozzle.
  • This needle 38 has, moreover, a suitable length so that its end opposite its tapered end extends into the extension of the injector tube 35.
  • Thermostatic valve 37 includes a valve body divided into two body half 36a, 36b, delimiting an annular internal groove housing the periphery of a membrane 39.
  • One of these body halves 36a has a tapped hole 40 front for fixing the nozzle holder tube 35, and a lateral threaded orifice 41 intended for the connection of the thermostatic valve 37 with the valve security 7.
  • This half of body 36a comprises, in additionally, a seat 42 coaxial with the front threaded orifice 40, and communicating with said front orifice by through a bore 43 opening into the bottoms respective said orifice and seat.
  • the second half of body 36b delimits an internal chamber 44 with a vent hole 45 ensuring that said air is brought to atmospheric pressure bedroom.
  • the thermostatic valve 37 comprises, in in addition, a valve 46 of a shape adapted to cooperate with the seat 42, and a conventional bellows 47 with expandable fluid, arranged on either side of the membrane, bearing against a floating part 48 secured to said membrane.
  • This thermostatic valve 37 and the tube injector holder 35 are arranged, as shown in the Figure 8, so that the needle 38 comes into abutment against valve 46, and is moved in the direction of plugging the injection nozzle during elongation bellows 47.
  • One such embodiment is particularly suitable for heating installations whose supply pressure is around 100 mbar, fitted with high power heaters heat (5,000 to 10,000 Watts).
  • the opening and the progressive closing of the injection nozzle of the second stage injector 33 provides a optimal gas speed at all speeds.
  • This heater has a first stage injector 50 connected directly to the safety valve 7 via a bypass line 51, and secured to the internal protrusion 17 of the pipe, so as to extend along an axis inclined with respect to the axis of said pipe.
  • the second stage injector 52 extends meanwhile in the axis of the pipe, in front of the first stage injector 50, and is mounted on the end of a tube 53 integral with the injector holder, towards its other end, on the body of a membrane valve 54 as shown in Figure 10.
  • This injector holder tube 53 also houses a needle 55 having a tapered section end suitable for entering the injection nozzle of the injector 52, so as to generate variations in flow functions of the relative position of said end tapered relative to said injection nozzle.
  • This needle 55 has, moreover, a length adapted so that its end opposite its tapered end extends into the extension of the injector tube 53.
  • the membrane valve 54 includes it has a valve body divided into two body halves 54a, 54b delimiting an annular internal groove housing the periphery of a membrane 56.
  • One of these body halves 54a has a front threaded hole 57 for fixing the nozzle holder tube 53, and a lateral threaded orifice 58 intended for the connection of the membrane valve 54 with the valve security 7.
  • the second half of body 54b delimits an internal chamber 59 with a vent hole 60 ensuring that said air is brought to atmospheric pressure chamber, inside which opens the orifice threaded front 57.
  • This membrane valve finally comprises conventionally, a spring 61 housed in the chamber 59, supported by one end on a floating part 62 integral with the membrane 56, and by its other end on a movable stop 63 whose position is controlled by a adjusting screw 64.
  • This diaphragm valve 54 and the injector tube 53 are arranged so that the needle 55 is secured to the floating part 62 and is moved longitudinally as a function of gas pressure supply modulated by regulation means centralized.
  • the injector tube 53 forms a seat 65
  • the needle 55 has a flange in valve form 66 capable of closing the seat 65, in the deployed position of the spring 58 corresponding to a gas supply pressure below preset threshold for closing the diaphragm valve 54.
  • this version is particularly suitable for heating systems including supply pressure is around 100 mbar, fitted with large power heating.
  • FIG 11 is a block diagram of thermostatic valves 19, 26 fitted to the devices shown in Figures 5 and 6.
  • This thermostatic valve is divided into two chambers 67, 68 by a membrane 69 secured to the level from its periphery to the valve body, and carrying a floating part 70.
  • This valve conventionally comprises, of a hand, a valve 71 bearing against the workpiece floating 70 and biased in the direction of opening of said valve by a spring 72, and on the other hand, a bellows 73 with expandable fluid bearing against the opposite side of the floating part 70 in order to urge the valve 71 in the closing direction, when it elongation.
  • Figure 12 is a diagram of principle of the membrane valves 16, 25 equipping the devices shown in Figures 4 and 5.
  • This diaphragm valve is divided in two chambers 74, 75 by a membrane 76 carrying a part floating 77.
  • a valve 78 integral with the floating part 77, while the other chamber 75 contains a spring 79 pressing at one end against the floating part 77, and, by its opposite end, against a movable stop 80 the position of which is adjusted by an adjusting screw 81.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Gas Burners (AREA)
  • Regulation And Control Of Combustion (AREA)

Description

L'invention concerne un dispositif d'injection et de régulation entre une puissance minimale, dite de ralenti, et une puissance maximale, dite nominale, pour brûleur atmosphérique à gaz d'appareils de chauffage, notamment du type à infrarouge, comportant une conduite d'amenée d'air dotée d'une embouchure d'entrée d'air et d'un élément Venturi. Ce dispositif est en outre du type comprenant des moyens d'injection de gaz raccordés à des moyens de canalisation d'alimentation en gaz, disposés dans la conduite d'amenée d'air de chaque brûleur, en amont de l'élément Venturi, et des moyens de régulation de la quantité de gaz délivrée vers les moyens d'injection. Un tel dispositif est, de plus, particulièrement adapté pour équiper des appareils de chauffage appelés à fonctionner à une faible pression nominale.The invention relates to a device injection and regulation between a minimum power, called idling, and a maximum power, called nominal, for atmospheric gas burner for heating appliances, in particular of the infrared type, comprising a pipe air inlet with an air inlet mouth and of a Venturi element. This device is also of the type comprising gas injection means connected to gas supply pipe means, arranged in the air supply line from each burner, upstream of the Venturi element, and means for regulating the quantity of gas delivered to the injection means. A such a device is, moreover, particularly suitable for equip heating appliances called to operate at low nominal pressure.

Dans l'état actuel de la technique, les brûleurs fonctionnant en basse pression, c'est-à-dire à une pression généralement inférieure à 500 mbar, sont affectés par une détérioration de la qualité de la combustion si la pression d'alimentation descend au-dessous de la valeur nominale pour laquelle ils ont été conçus.In the current state of the art, the burners operating at low pressure, i.e. at a pressure generally less than 500 mbar, are affected by a deterioration in the quality of combustion if the supply pressure drops below the value nominal for which they were designed.

En effet, l'équilibre du dosage du gaz carburant injecté et de l'air comburant aspiré ne reste satisfaisant que dans les limites d'une plage restreinte au-dessous de la pression nominale.Indeed, the balance of the gas dosage injected fuel and sucked combustion air remains satisfactory that within a limited range below the nominal pressure.

Cet état de fait interdit l'utilisation d'une régulation par variation dégressive de la pression d'alimentation jusqu'à un ralenti minimum et conduit à utiliser une régulation "tout ou rien" nécessitant alors un réallumage électrique ou un dispositif de veilleuse.This fact prohibits the use of a regulation by degressive variation of the pressure supply to a minimum idle speed and leads to use an "all or nothing" regulation then requiring a electric re-ignition or a pilot device.

Il est à noter que cet inconvénient relatif à l'impossibilité d'obtenir une grande plage de régulation par variation de la pression nominale, sans entraíner une détérioration de la qualité de combustion, s'atténue et s'efface rapidement lorsque les appareils sont prévus pour fonctionner à des pressions supérieures à 1 Bar. La plage de bonne carburation s'élargit en effet lorsque la pression s'élève, et ainsi, avec des appareils prévus, par exemple, pour fonctionner à une pression de 1,4 Bar en régime nominal , on peut diminuer la pression jusqu'à une pression de ralenti de 0,02 Bar.Note that this relative disadvantage unable to obtain a large regulation range by variation of the nominal pressure, without causing a deterioration in combustion quality, decreases and erases quickly when the devices are intended to operate at pressures above 1 Bar. The beach good carburation widens indeed when the pressure rises, and so, with devices provided, for example, to operate at a pressure of 1.4 Bar in steady state nominal, the pressure can be reduced to a pressure idle speed of 0.02 Bar.

Le problème concerne donc les appareils "basse pression" soit, à titre d'exemple, un appareil fonctionnant à une pression nominale de 350 mbar pour lequel l'admission d'air aspiré et l'injection de gaz débité par l'injecteur ne restent pas proportionnelles sur une plage de pression descendant au-dessous de 50 % du régime nominal.The problem therefore concerns the devices "low pressure" is, for example, a device operating at a nominal pressure of 350 mbar for which the intake of aspirated air and the injection of gas delivered by the injector do not remain proportional to a pressure range falling below 50% of the nominal speed.

La présente invention vise à solutionner ce problème et a pour objectif essentiel de fournir un dispositif d'injection et de régulation permettant de conserver une bonne carburation des brûleurs atmosphériques à gaz prévus pour fonctionner en régime nominal basse pression quand on désire moduler leur régime jusqu'à un ralenti minimal à partir de la pression nominale.The present invention aims to solve this problem and has as its main objective to provide a injection and regulation device allowing keep good carburetion of atmospheric burners with gas intended to operate in nominal low mode pressure when you want to adjust their diet to a minimum idle from nominal pressure.

A cet effet, l'invention concerne un dispositif d'injection et de régulation entre une puissance minimale de ralenti et une puissance maximale nominale, pour des brûleurs atmosphériques à gaz d'appareils de chauffage, ledit dispositif comprenant des moyens d'injection de gaz raccordés à des moyens de canalisation d'alimentation en gaz, disposés dans la conduite d'amenée d'air de chaque brûleur, en amont de l'élément Venturi, et des moyens de régulation de la quantité de gaz délivrée vers les moyens d'injection, et se caractérisant en ce que :

  • les moyens d'injection comportent au moins deux injecteurs, dont un injecteur dit de premier étage et au moins un injecteur dit de deuxième étage, dotés chacun d'une buse d'injection, disposés dans la conduite d'amenée d'air en amont de l'élément Venturi, avec leurs buses d'injection décalées longitudinalement les unes par rapport aux autres, et orientées de façon que l'axe de leur flux converge vers une zone, dite foyer de l'élément Venturi, située dans l'axe de la conduite d'amenée d'air, au droit dudit élément Venturi,
  • les moyens de canalisation d'alimentation en gaz des injecteurs sont adaptés pour que l'injecteur de premier étage soit constamment alimenté en une quantité de gaz au moins égale à la quantité de gaz nécessaire à l'obtention de la puissance de ralenti,
  • les moyens de régulation sont adaptés pour moduler en cascade l'alimentation de chaque injecteur de deuxième étage en fonction de données de régulation de température, de façon à obtenir la puissance désirée.
To this end, the invention relates to an injection and regulation device between a minimum idling power and a nominal maximum power, for atmospheric gas burners of heating appliances, said device comprising gas injection means. connected to gas supply pipe means, arranged in the air supply pipe of each burner, upstream of the Venturi element, and means for regulating the quantity of gas delivered to the means of injection, and characterized in that:
  • the injection means comprise at least two injectors, including one said first stage injector and at least one said second stage injector, each provided with an injection nozzle, arranged in the air supply pipe upstream of the Venturi element, with their injection nozzles longitudinally offset from each other, and oriented so that the axis of their flow converges towards an area, called the focal point of the Venturi element, located in the axis the air supply pipe, in line with said Venturi element,
  • the means for supplying gas to the injectors are adapted so that the first stage injector is constantly supplied with a quantity of gas at least equal to the quantity of gas necessary for obtaining the idling power,
  • the regulation means are adapted to cascade modulate the supply of each second stage injector as a function of temperature regulation data, so as to obtain the desired power.

(Il est à noter que par "au moins" un injecteur de deuxième étage on entend englober des dispositifs comportant plusieurs étages, et/ou des dispositifs comportant plusieurs injecteurs par étage).(Note that by "at least" a second stage injector is intended to include devices comprising several stages, and / or devices with several injectors per stage).

Le principe de l'invention est donc de prévoir plusieurs injecteurs utilisés en cascade, permettant de réduire le calibre des injecteurs respectifs pour une quantité de gaz délivrée donnée, et conduisant à une augmentation de la vitesse d'éjection du flux de gaz et à une amélioration de l'effet d'aspiration de l'air à l'entrée de l'élément Venturi.The principle of the invention is therefore to provide several injectors used in cascade, reducing the caliber of the respective injectors for a given quantity of gas delivered, and leading to an increase in the speed of ejection of the gas flow and improved air suction effect at the entrance to the Venturi element.

De plus, la disposition spécifique de ces injecteurs décalés longitudinalement les uns par rapport aux autres et agencés de façon que les flux de gaz convergent vers le foyer de l'élément Venturi, est primordiale quant au résultat recherché car elle permet d'ajuster les effets d'aspiration provoqués par chaque injecteur dont les diamètres des buses d'injection peuvent ainsi être différents et adaptés aux besoins de combustion.In addition, the specific provision of these injectors offset longitudinally with respect to to others and arranged so that the gas flows converge towards the focus of the Venturi element, is essential for the desired result because it allows to adjust the suction effects caused by each injector whose injection nozzle diameters can thus be different and adapted to combustion needs.

Dans la pratique, il s'est avéré qu'une telle conception permet de moduler le régime d'un brûleur fonctionnant en basse pression entre une puissance maximale nominale et une puissance minimale de ralenti et ce, sans affecter la qualité de la combustion.In practice, it turned out that a such a design makes it possible to modulate the speed of a burner operating at low pressure between maximum power nominal and minimum idling power without affect the quality of combustion.

Cette qualité de la combustion a notamment été constatée lors du fonctionnement d'appareils de chauffage à infrarouge dont on sait que la transformation en rayonnement infrarouge d'un pourcentage important de la puissance calorifique mise en jeu nécessite, à tous régimes, une optimisation des proportions du mélange air/gaz.This quality of combustion has notably was found during the operation of infrared heating which we know to transform in infrared radiation a significant percentage of the calorific power involved requires, at all regimes, an optimization of the proportions of the mixture air / gas.

Selon un mode de réalisation préférentiel, un des injecteurs est disposé dans l'axe de la conduite d'amenée d'air, chacun des autres injecteurs étant incliné par rapport audit axe de façon à converger vers ce dernier.According to a preferred embodiment, one of the injectors is arranged in the axis of the pipe air supply, each of the other injectors being inclined with respect to said axis so as to converge on the latter.

De plus, selon une autre caractéristique de l'invention, au moins un des injecteurs de deuxième étage est monté sur un tube porte-injecteur logeant un pointeau présentant une extrémité effilée de section adaptée pour pénétrer dans la buse d'injection, ledit pointeau étant associé à des moyens d'actionnement aptes à le déplacer de façon à l'amener soit dans une position de fermeture de l'alimentation en gaz de l'injecteur, soit dans des positions de régulation où il engendre des variations de débit fonctions de sa position.In addition, according to another characteristic of the invention, at least one of the second stage injectors is mounted on an injector tube housing a needle having a tapered end of section adapted for penetrate the injection nozzle, said needle being associated with actuating means able to move it from so as to bring it either into a closed position of the gas supply to the injector, either in regulation positions where it generates variations in flow functions of its position.

Une telle disposition permet d'engendrer une ouverture et une fermeture progressives de la buse d'injection des injecteurs de deuxième étage et d'obtenir une vitesse d'éjection de gaz optimale et ce à tous régimes.Such a provision makes it possible to generate progressive opening and closing of the nozzle second stage injectors and get optimal gas ejection speed for all diets.

Selon une première variante avantageuse de l'invention, le dispositif comprend des moyens de régulation centralisés montés sur une conduite principale d'alimentation en gaz de plusieurs appareils de chauffage, et aptes à réguler la pression de gaz dans la conduite principale en fonction de données de régulation de température. Dans ce cas, en outre :

  • chaque injecteur de premier étage de chaque brûleur est raccordé à la conduite principale de façon que la pression du gaz d'alimentation dudit injecteur soit celle déterminée par les moyens de régulation,
  • chaque injecteur de deuxième étage de chaque brûleur est raccordé à la conduite principale par l'intermédiaire d'une canalisation sur laquelle est interposée une valve apte à obturer ladite canalisation lorsque la pression de gaz dans cette dernière devient inférieure à un seuil prédéterminé.
According to a first advantageous variant of the invention, the device comprises centralized regulation means mounted on a main gas supply pipe for several heating devices, and capable of regulating the gas pressure in the main pipe as a function of data temperature control. In this case, in addition:
  • each first stage injector of each burner is connected to the main pipe so that the pressure of the feed gas to said injector is that determined by the regulating means,
  • each second stage injector of each burner is connected to the main pipe by means of a pipe on which is interposed a valve capable of closing said pipe when the gas pressure in the latter becomes lower than a predetermined threshold.

De plus, la valve équipant un tel dispositif est préférentiellement une valve à membrane comprenant deux chambres séparées de façon étanche par une membrane :

  • une chambre dotée d'une entrée d'alimentation et d une sortie d'alimentation formant un siège, et logeant un clapet solidaire de la membrane et apte à obturer le siège,
  • une chambre logeant des moyens élastiques aptes à solliciter la membrane dans le sens de la fermeture du siège par le clapet.
In addition, the valve fitted to such a device is preferably a membrane valve comprising two chambers separated in a sealed manner by a membrane:
  • a chamber provided with a supply inlet and a supply outlet forming a seat, and housing a valve integral with the membrane and capable of closing the seat,
  • a chamber housing elastic means capable of urging the membrane in the direction of closing of the seat by the valve.

Par ailleurs, et toujours selon cette première variante, au moins un des injecteurs du deuxième étage est avantageusement monté sur un tube porte-injecteur logeant un pointeau présentant une extrémité effilée de section adaptée pour pénétrer dans la buse d'injection, le tube porte-injecteur étant associé à une valve dotée d'un organe mobile, et le pointeau étant solidaire de l'organe mobile de ladite valve et venant dans le prolongement de celui-ci, de façon à amener ledit pointeau dans des positions de régulation où il engendre des variations de débit fonctions de sa position.Furthermore, and always according to this first variant, at least one of the injectors of the second stage is advantageously mounted on an injector tube housing a needle with a tapered end of section suitable for entering the injection nozzle, the injector tube being associated with a valve provided with a movable member, and the needle being integral with the member mobile of said valve and coming in the extension of the latter, so as to bring said needle into regulation positions where it generates variations in flow functions of its position.

Comme précédemment décrit, cette disposition permet de fermer et d'ouvrir progressivement les buses d'injection et d'optimiser la vitesse d'éjection des gaz.As previously described, this provision allows to gradually close and open injection nozzles and optimize the ejection speed gases.

Selon une deuxième variante avantageuse de l'invention, les moyens de régulation sont de type individuels et comprennent une vanne commandée de régulation du débit de gaz, associée à chaque brûleur d'appareil de chauffage, et raccordée à une conduite principale d'alimentation en gaz.According to a second advantageous variant of the invention, the regulation means are of the type individual and include a valve controlled from gas flow regulation, associated with each burner heater, and connected to a pipe main gas supply.

Concernant cette deuxième variante, en outre, deux conceptions différentes visant notamment l'agencement et l'alimentation des injecteurs, sont prévues selon l'invention.Regarding this second variant, in in addition, two different designs aimed in particular the layout and supply of the injectors are provided according to the invention.

Ainsi, selon un premier mode de réalisation préférentiel :

  • chaque injecteur de premier étage de chaque brûleur est raccordé à la vanne commandée associée, par une canalisation dotée d'un tronçon en dérivation par rapport à ladite vanne, comportant un pré-injecteur de ralenti de calibre adapté pour créer une perte de charge permettant d'obtenir une pression de gaz correspondant à la puissance de ralenti du brûleur, dans la position fermée de la vanne commandée,
  • chaque injecteur de deuxième étage de chaque brûleur est raccordé à la canalisation d'alimentation de l'injecteur du premier étage par l'intermédiaire d'une canalisation sur laquelle est interposée une valve apte à obturer ladite canalisation lorsque la pression de gaz dans cette dernière devient inférieure à un seuil prédéterminé.
Thus, according to a first preferential embodiment:
  • each first stage injector of each burner is connected to the associated controlled valve, by a pipe provided with a section in bypass with respect to said valve, comprising an idle pre-injector of caliber adapted to create a pressure drop allowing d '' obtain a gas pressure corresponding to the idle power of the burner, in the closed position of the controlled valve,
  • each second stage injector of each burner is connected to the supply pipe of the first stage injector by means of a pipe on which is interposed a valve capable of closing said pipe when the gas pressure in the latter becomes below a predetermined threshold.

Le pré-injecteur de ralenti permet de créer, lorsque la vanne commandée est fermée, une perte de charge permettant d'obtenir une pression correspondant au régime minimal de ralenti du brûleur associé. Le gaz d'alimentation entrant dans la vanne commandée avec une pression nominale fixe, ce pré-injecteur de ralenti qui reçoit cette pression fixe, fournit ainsi une pression de régime minimal.The idle pre-injector allows create, when the controlled valve is closed, a loss of charge allowing a pressure corresponding to the minimum idle speed of the associated burner. The gas supply entering the valve controlled with a fixed nominal pressure, this idle pre-injector which receives this fixed pressure, thus provides a pressure of minimum regime.

En outre, ce pré-injecteur est préférentiellement un injecteur de type classique comprenant un corps formant un boisseau doté d'un orifice d'injection, vers une de ses extrémités, ledit injecteur étant positionné "tête-bêche" de façon que le gaz pénètre par l'orifice d'injection.In addition, this pre-injector is preferably a conventional type injector comprising a body forming a plug with an orifice injection, towards one of its ends, said injector being positioned "head to tail" so that the gas penetrates through the injection port.

Cette disposition a pour but d'éviter l'accumulation et l'agglomération de micro-impuretés provenant des conduites et du gaz commercial lui-même. En effet, dans la disposition classique des injecteurs, c'est-à-dire avec entrée du gaz par l'extrémité de l'injecteur opposée au boisseau, le profil intérieur dudit injecteur est conique par nécessité technologique de perforation de l'orifice calibré. Cette conicité intérieure, formant goulot d'étranglement pour les micro-impuretés qui peuvent s'y agglomérer et s'y tasser, conduit souvent à l'obstruction des injecteurs de faible calibre.The purpose of this provision is to avoid the accumulation and agglomeration of micro-impurities from the pipelines and the commercial gas itself. In effect, in the conventional arrangement of injectors, that is to say with gas inlet through the end of the injector opposite the plug, the internal profile of said injector is conical by technological necessity of perforation of the calibrated orifice. This inner taper, forming bottleneck for micro-impurities which can agglomerate and settle there, often leads to obstruction of small caliber injectors.

Dans la disposition adoptée, si une micro-impureté réussit à pénétrer dans le pré-injecteur de ralenti, elle n'aura aucune chance de s'accumuler dans ce pré-injecteur après s'être introduite par son extrémité conique.In the adopted provision, if a micro-impurity succeeds in penetrating the pre-injector of slowed down, it will have no chance to accumulate in this pre-injector after being introduced by its end conical.

Selon un autre mode de réalisation préférentiel concernant la deuxième variante :

  • chaque injecteur de premier étage de chaque brûleur est connecté à une canalisation raccordée en amont de la vanne commandée associée de façon que la pression du gaz d'alimentation dudit injecteur soit celle de la conduite principale d'alimentation en gaz,
  • chaque injecteur de deuxième étage de chaque brûleur est connecté à une canalisation raccordée en aval de la vanne commandée associée.
According to another preferred embodiment concerning the second variant:
  • each first stage injector of each burner is connected to a pipe connected upstream of the associated controlled valve so that the pressure of the supply gas of said injector is that of the main gas supply pipe,
  • each second stage injector of each burner is connected to a pipe connected downstream of the associated controlled valve.

Ce deuxième mode de réalisation constitue une solution plus économique que celle décrite ci-dessus car elle permet de supprimer les valves d'obturation des injecteurs de deuxième étage, ce gain économique étant toutefois obtenu au détriment d'une légère baisse des performances à la fin de la fermeture ou au début de l'ouverture de la vanne commandée.This second embodiment constitutes a more economical solution than the one described above because it removes the shutter valves from second stage injectors, this economic gain being however obtained at the expense of a slight drop in performance at the end of closing or at the start of opening of the controlled valve.

Compte tenu de la conception de cette version, les vitesses d'éjection du gaz ne sont en effet pas rigoureusement optimisées en fin de fermeture ou au début de l'ouverture de la vanne.Given the design of this version, the gas ejection speeds are only not rigorously optimized at the end of closing or at start of valve opening.

Cet inconvénient peut toutefois être solutionné au moyen d'un dispositif dans lequel la vanne commandée comporte un corps de vanne doté d'une entrée de fluide et d'une sortie de fluide, et d'un clapet apte à obturer la sortie de fluide sous l'action d'un élément thermostatique dilatable, ledit dispositif comprenant en outre un injecteur de deuxième étage monté sur un tube porte-injecteur logeant un pointeau présentant une extrémité effilée de section adaptée pour pénétrer dans la buse d'injection :

  • le tube porte-injecteur étant solidaire du corps de la vanne commandée de façon à venir dans le prolongement de la sortie de fluide de cette dernière,
  • le pointeau étant agencé pour être déplacé par le clapet de la vanne commandée dans le sens de la fermeture de la buse d'injection, lors d'un déplacement engendrant une diminution du débit de gaz,
  • le pointeau étant associé à des moyens élastiques aptes à solliciter un déplacement dudit pointeau dans le sens de l'ouverture de la buse d'injection.
This drawback can however be solved by means of a device in which the controlled valve comprises a valve body provided with a fluid inlet and a fluid outlet, and with a valve capable of blocking the fluid outlet under the action of an expandable thermostatic element, said device further comprising a second stage injector mounted on an injector carrier tube housing a needle having a tapered end of section adapted to penetrate into the injection nozzle:
  • the injector tube being integral with the body of the valve controlled so as to come in line with the fluid outlet of the latter,
  • the needle being arranged to be moved by the valve of the controlled valve in the direction of closing of the injection nozzle, during a movement causing a reduction in the gas flow rate,
  • the needle being associated with elastic means capable of requesting a displacement of said needle in the direction of opening of the injection nozzle.

Par ailleurs, selon ce deuxième mode de réalisation, la position de l'injecteur de premier étage doit être adaptée au fait que ledit injecteur, d'une part, est alimenté avec une pression de gaz fixe correspondant à la pression nominale et, d'autre part, doit fournir un débit d'injection correspondant au régime minimal de ralenti.Furthermore, according to this second mode of realization, the position of the first stage injector must be adapted to the fact that said injector, on the one hand, is supplied with a fixed gas pressure corresponding to nominal pressure and, on the other hand, must provide a injection rate corresponding to the minimum speed of slow motion.

Une première solution avantageuse visant à satisfaire ces exigences consiste à réaliser un dispositif comprenant un injecteur de deuxième étage disposé dans l'axe de la conduite d'amenée d'air, et un injecteur de premier étage incliné par rapport audit axe de façon à converger vers ce dernier, et positionné de façon que sa buse d'injection soit décalée longitudinalement vers l'avant par rapport à celle de l'injecteur de deuxième étage.A first advantageous solution aimed at meeting these requirements consists in making a device comprising a second stage injector arranged in the axis of the air supply pipe, and a first stage inclined with respect to said axis so as to converge towards the latter, and positioned so that its injection nozzle is offset longitudinally towards the front versus that of the second injector floor.

Une autre solution consiste à réaliser un dispositif comprenant un injecteur de deuxième étage disposé dans l'axe de la conduite d'amenée d'air, et un injecteur de premier étage incliné par rapport audit axe de façon à converger vers ce dernier, et positionné de façon que sa buse d'injection soit décalée longitudinalement vers l'arrière par rapport à celle de l'injecteur de deuxième étage, ledit dispositif comportant, alors, un obstacle disposé de façon à intercepter le flux de gaz délivré par l'injecteur de premier étage.Another solution is to perform a device comprising a second stage injector arranged in the axis of the air supply pipe, and a first stage injector inclined with respect to said axis of so as to converge towards the latter, and positioned so its injection nozzle is offset longitudinally towards rear compared to that of the second injector floor, said device then comprising an obstacle arranged to intercept the flow of gas delivered by the first stage injector.

Cette deuxième solution, qui consiste à ajuster la vitesse d'éjection des gaz en interposant un obstacle sur le trajet du jet de gaz en vue de ralentir sa vitesse et de modifier, en la diminuant, la quantité d'air entraínée, s'avère la plus avantageuse.This second solution, which consists of adjust the gas ejection speed by interposing a obstacle in the path of the gas jet in order to slow down its speed and change, by decreasing, the amount of air driven, is the most advantageous.

En effet, l'obstacle peut être réalisé de façon très simple, au moyen par exemple d'une vis faisant saillie à l'intérieur de la conduite d'amenée d'air, et sa position peut être réglée de façon très aisée jusqu'à obtention des conditions optimales de fonctionnement.Indeed, the obstacle can be made of very simple way, for example by means of a screw making protrusion inside the air supply pipe, and its position can be adjusted very easily up to obtaining optimal operating conditions.

D'autres caractéristiques, buts et avantages de l'invention ressortiront de la description détaillée qui suit en référence aux dessins annexés qui en représentent à titre d'exemples non limitatifs cinq modes de réalisation préférentiels. Sur ces dessins qui font partie intégrante de la présente description :

  • la figure 1 est un schéma de principe d'une installation de chauffage comportant plusieurs appareils de chauffage du type à infrarouge, et des moyens de régulation centralisés, telle que notamment visée par l'invention,
  • la figure 2 est une vue schématique latérale d'un appareil de chauffage à infrarouge du type équipant l'installation de chauffage représentée à la figure 1, doté d'un dispositif d'injection conforme à l'invention,
  • la figure 3 est une vue de dessus partielle représentant les conduits d'amenée d'air et d'alimentation en gaz de l'appareil de chauffage représenté à la figure 2,
  • la figure 4 est une vue longitudinale schématique partiellement en coupe par un plan axial vertical, des moyens d'alimentation en air et en gaz de l'appareil de chauffage de la figure 2,
  • la figure 5 est une vue longitudinale schématique partiellement en coupe par un plan axial vertical, de moyens d'alimentation en air et en gaz conformes à l'invention raccordés à un appareil de chauffage à infrarouge équipé de moyens de régulation individuels.
  • la figure 6 est une vue longitudinale schématique partiellement en coupe par un plan axial vertical, d'une variante de moyens d'alimentation en air et en gaz conformes a l'invention, raccordés a un appareil de chauffage à infrarouge équipé de moyens de régulation individuels,
  • la figure 7 est une vue longitudinale schématique partiellement en coupe par un plan axial vertical, d'une deuxième variante de moyens d'alimentation en air et en gaz conformes à l'invention, raccordés à un appareil de chauffage à infrarouge équipé de moyens de régulation individuels,
  • la figure 8 est une coupe longitudinale par un plan axial vertical représentant schématiquement l'injecteur à pointeau et la vanne thermostatique des moyens d'alimentation de la figure 7,
  • la figure 9 est une vue longitudinale schématique partiellement en coupe par un plan axial vertical, d'une variante de réalisation de moyens d'alimentation en air et en gaz équipant une installation de chauffage dotée de moyens de régulation centralisés,
  • la figure 10 est une coupe longitudinale par un plan axial vertical représentant schématiquement l'injecteur à pointeau et la valve à membrane des moyens d'alimentation de la figure 9,
  • la figure 11 est une coupe longitudinale de principe d'une vanne thermostatique conforme à l'invention telle que montée sur les appareils de chauffage représentés aux figures 5, 6, équipés de moyens de régulation individuels,
  • et la figure 12 est une coupe longitudinale de principe d'une valve à membrane conforme à l'invention telle que montée sur les appareils de chauffage représentés aux figures 4 et 5.
Other characteristics, objects and advantages of the invention will emerge from the detailed description which follows, with reference to the appended drawings which show by way of non-limiting examples five preferred embodiments. On these drawings which form an integral part of this description:
  • FIG. 1 is a block diagram of a heating installation comprising several heating devices of the infrared type, and centralized regulation means, such as in particular targeted by the invention,
  • FIG. 2 is a schematic side view of an infrared heating device of the type fitted to the heating installation shown in FIG. 1, provided with an injection device according to the invention,
  • FIG. 3 is a partial top view showing the air supply and gas supply conduits of the heating appliance shown in FIG. 2,
  • FIG. 4 is a schematic longitudinal view partially in section through a vertical axial plane, of the air and gas supply means of the heating appliance of FIG. 2,
  • Figure 5 is a schematic longitudinal view partially in section through a vertical axial plane, of air and gas supply means according to the invention connected to an infrared heating device equipped with individual control means.
  • Figure 6 is a schematic longitudinal view partially in section through a vertical axial plane, of a variant of air and gas supply means according to the invention, connected to an infrared heating device equipped with regulation means individual,
  • FIG. 7 is a schematic longitudinal view partially in section through a vertical axial plane, of a second variant of air and gas supply means in accordance with the invention, connected to an infrared heating device equipped with means individual regulation,
  • FIG. 8 is a longitudinal section through a vertical axial plane schematically representing the needle injector and the thermostatic valve of the supply means of FIG. 7,
  • FIG. 9 is a schematic longitudinal view partially in section through a vertical axial plane, of an alternative embodiment of air and gas supply means fitted to a heating installation provided with centralized regulation means,
  • FIG. 10 is a longitudinal section through a vertical axial plane schematically representing the needle injector and the membrane valve of the supply means of FIG. 9,
  • FIG. 11 is a longitudinal section in principle of a thermostatic valve according to the invention as mounted on the heating appliances shown in FIGS. 5, 6, equipped with individual regulation means,
  • and FIG. 12 is a longitudinal section in principle of a membrane valve according to the invention as mounted on the heating devices shown in FIGS. 4 and 5.

Les dispositifs d'injection et de régulation conformes à l'invention sont représentés aux figures associés à des appareils de chauffage 1 à infrarouge tels qu'utilisés dans le secteur agricole pour le chauffage de bâtiments d'élevage.Injection and regulation according to the invention are shown in figures associated with heaters 1 to infrared as used in the agricultural sector for heating of livestock buildings.

Tel que représenté à la figure 2, de tels appareils de chauffage 1 comprennent en premier lieu un réflecteur 2 se présentant sous la forme d une coupole destinée à être suspendue au-dessus de l'emplacement choisi à l'aide par exemple d'une chaíne 3, et renfermant les organes de diffusion, de combustion et de radiation (de tels organes non représentés peuvent notamment être du type de ceux décrits dans le brevet US 5060629 au nom du déposant).As shown in Figure 2, such heaters 1 include in the first place a reflector 2 in the form of a dome intended to be suspended above the chosen location using for example a chain 3, and containing the diffusion, combustion and radiation organs (of such bodies, not shown, may in particular be of the type of those described in patent US 5060629 in the name of depositor).

Chaque appareil de chauffage 1 comprend, en outre, une conduite d'alimentation en mélange air/gaz constituée d'une conduite coudée dotée, de façon classique, d'un élément venturi 5 et d'une embouchure d'entrée 6 pour l'air de combustion primaire.Each heater 1 comprises, in in addition, a supply line for air / gas mixture consisting of a bent pipe provided, so classic, a venturi element 5 and a mouthpiece inlet 6 for primary combustion air.

Cet appareil de chauffage 1 comprend, également, de façon classique, une valve de sécurité 7 branchée sur une canalisation 8 d'alimentation en gaz dudit appareil, et dont la sortie est reliée à des moyens d'injection de gaz disposés en amont de l'élément venturi 5 et décrits ci-après.This heater 1 comprises, also, conventionally, a safety valve 7 connected to a gas supply pipe 8 for said gas device, and the output of which is connected to means of gas injection arranged upstream of the venturi element 5 and described below.

(Les éléments ci-dessus décrits étant communs à chacune des variantes, ils seront désignés par les mêmes références numériques dans toute la suite de la description).(The elements described above being common to each variant, they will be designated by the same reference numbers throughout the rest of the description).

Selon l'invention, de tels appareils de chauffage 1 sont destinés à fonctionner en régime nominal basse pression avec possibilité de modulation de leur régime jusqu'à un régime de ralenti minimal.According to the invention, such devices for heating 1 are intended to operate in nominal mode low pressure with possibility of modulation of their speed up to a minimum idle speed.

En outre, selon les variantes représentées, les moyens de régulation permettant cette modulation sont soit centralisés (figures 1, 2, 3, 4, 9, 10) et donc communs à plusieurs appareils de chauffage, soit individuels et composés d'une vanne commandée de régulation du débit de gaz associée à chaque appareil (figures 5 à 8).In addition, according to the variants shown, the means of regulation allowing this modulation are either centralized (Figures 1, 2, 3, 4, 9, 10) and therefore common to several heaters, i.e. individual and composed of a controlled regulation valve the gas flow rate associated with each appliance (Figures 5 to 8).

Le point commun entre ces différentes variantes réside dans le fait que :

  • les moyens d'injection sont constitués de deux injecteurs, respectivement un injecteur de premier étage et un injecteur de deuxième étage, dotés chacun d'une buse d'injection, disposés dans la conduite, en amont de l'élément venturi 5, avec leurs buses d'injection décalées longitudinalement et orientées de façon que l'axe de leur flux converge vers le foyer de l'élément venturi 5, un desdits injecteurs s'étendant dans l'axe de la conduite, et l'autre injecteur étant incliné par rapport audit axe.
  • l'injecteur de premier étage est calibré de façon à donner un débit d'injection approprié à la pression minimum de ralenti.
  • l'injecteur de deuxième étage est calibré pour donner un débit d'injection permettant d'obtenir en combinaison avec l'injecteur de premier étage, lorsque la pression d'alimentation atteint sa valeur nominale, la totalité de la puissance nominale de l'appareil.
  • les moyens de régulation sont adaptés pour moduler l'alimentation de l'injecteur de deuxième étage de façon à obtenir la puissance désirée.
The common point between these different variants lies in the fact that:
  • the injection means consist of two injectors, respectively a first stage injector and a second stage injector, each provided with an injection nozzle, arranged in the pipe, upstream of the venturi element 5, with their injection nozzles longitudinally offset and oriented so that the axis of their flow converges towards the focal point of the venturi element 5, one of said injectors extending in the axis of the pipe, and the other injector being inclined by report to said axis.
  • the first stage injector is calibrated so as to give an injection flow suitable for the minimum idling pressure.
  • the second stage injector is calibrated to give an injection flow making it possible to obtain, in combination with the first stage injector, when the supply pressure reaches its nominal value, all of the nominal power of the device .
  • the regulation means are adapted to modulate the supply of the second stage injector so as to obtain the desired power.

En premier lieu, la figure 1 représente une installation dotée de moyens de régulation centralisés, comportant une conduite principale d'alimentation 9 sur laquelle sont raccordées des canalisations 8 d'alimentation en gaz des appareils de chauffage.First, Figure 1 shows a installation with centralized regulation means, comprising a main supply line 9 on which are connected supply lines 8 gas from heaters.

Ces moyens de régulation centralisés se composent, de façon classique, d'un tableau de régulation 10 avec vanne thermostatique ou détendeur de puissance asservi à un servo-moteur, le tout étant disposé en parallèle par rapport à une conduite de dérivation 11 sur laquelle est disposé un détendeur de ralenti 12.These centralized means of regulation are typically consist of a control panel 10 with thermostatic valve or power regulator slaved to a servo motor, the whole being arranged in parallel to a branch line 11 on which is arranged an idle pressure reducer 12.

Selon le mode de réalisation représenté aux figures 2 à 4, chaque appareil de chauffage comporte un injecteur de premier étage 13 raccordé directement sur une sortie de la valve de sécurité 7 et agencé pour s'étendre dans l'axe de la conduite 4.According to the embodiment shown in Figures 2 to 4, each heater has a first stage injector 13 connected directly to a safety valve 7 outlet and arranged to extend in line with the pipe 4.

Cet appareil de chauffage comporte, en outre, un injecteur de second étage 14 incliné par rapport à l'axe de la conduite et disposé en retrait par rapport à l'injecteur de premier étage 13. Cet injecteur 14 est raccordé sur une deuxième sortie de la valve de sécurité 7 par l'intermédiaire d'une conduite de dérivation 15 sur laquelle est montée une valve à membrane 16. Cet injecteur de deuxième étage 14 est, par ailleurs, directement solidarisé sur une excroissance interne 17 de la conduite 4, percée d'un alésage 18 d'amenée du gaz.This heater comprises, in in addition, a second stage injector 14 inclined relative to to the axis of the pipe and set back relative to to the first stage injector 13. This injector 14 is connected to a second outlet of the safety valve 7 via a branch line 15 on which is mounted a membrane valve 16. This injector second floor 14 is, moreover, directly secured to an internal protuberance 17 of the pipe 4, pierced with a gas supply bore 18.

La valve à membrane 16, dont la conception sera décrite plus loin en référence à la figure 12, est classiquement adaptée pour obturer la conduite de dérivation 15 lorsque la pression de gaz dans cette dernière devient inférieure à un seuil prédéterminé.The diaphragm valve 16, whose design will be described later with reference to Figure 12, is conventionally adapted to seal the pipe of bypass 15 when the gas pressure in this the latter becomes below a predetermined threshold.

Un tel mode de réalisation est particulièrement adapté pour des installations de chauffage dont la pression nominale d'alimentation est supérieure à 100 mbars, avec une variation de pression possible entre 20 mbars et la puissance nominale.One such embodiment is particularly suitable for heating installations with a nominal supply pressure greater than 100 mbar, with a possible pressure variation between 20 mbar and nominal power.

De plus, selon ce mode de réalisation, l'injecteur de premier étage 13 est calibré pour donner un débit d'injection approprié à la pression de 20 mbars.In addition, according to this embodiment, the first stage injector 13 is calibrated to give a injection rate suitable for a pressure of 20 mbar.

Les modes de réalisation représentés aux figures 5 à 8 visent des appareils de chauffage dotés de leur propre organe de régulation individuel, consistant en une vanne thermostatique dont la conception sera décrite plus loin en référence à la figure 11.The embodiments shown in Figures 5 to 8 are for heaters with their own individual regulatory body, consisting of a thermostatic valve whose design will be described later with reference to Figure 11.

Selon la première variante de réalisation représentée à la figure 5, la vanne thermostatique 19 est disposée en amont de la valve de sécurité 7. En parallèle avec cette vanne thermostatique 19, la conduite d'alimentation en gaz 8 présente un tronçon en dérivation 20 comportant un pré-injecteur de ralenti 21.According to the first variant shown in Figure 5, the thermostatic valve 19 is disposed upstream of the safety valve 7. In parallel with this thermostatic valve 19, the pipe gas supply 8 has a bypass section 20 comprising an idling pre-injector 21.

Un tel pré-injecteur de ralenti 21 est conçu pour créer, lorsque la vanne thermostatique 19 est fermée, une perte de charge permettant d'obtenir une pression correspondant au régime minimal de ralenti. Le pré-injecteur 21 est, en outre, constitué d'un injecteur classique positionné "tête-bêche" de façon que le gaz pénètre par son orifice d'injection.Such an idle pre-injector 21 is designed to create when the thermostatic valve 19 is closed, a pressure drop allowing a pressure corresponding to the minimum idling speed. The pre-injector 21 furthermore consists of an injector classic positioned "head to tail" so that the gas enters through its injection port.

Les injecteurs, selon cette variante de réalisation sont disposés de façon identique à ceux de l'appareil de chauffage de la figure 4 : l'injecteur de premier étage 22 est raccordé directement sur la valve de sécurité 7 et s'étend dans l'axe de la conduite, et l'injecteur de deuxième étage 23 est incliné par rapport audit axe, et raccordé à la valve de sécurité 7 par une conduite de dérivation 24 comportant une valve a membrane 25.The injectors, according to this variant of realization are arranged identically to those of the heater of figure 4: the injector of first stage 22 is connected directly to the valve safety 7 and extends in the axis of the pipe, and the second stage injector 23 is inclined relative to said axis, and connected to the safety valve 7 by a bypass line 24 comprising a membrane valve 25.

Un tel mode de réalisation est particulièrement adapté pour des installations de chauffage dont la pression nominale d'alimentation est supérieure a 150 mbars, avec une variation possible entre 20 mbars et la puissance nominale.One such embodiment is particularly suitable for heating installations whose nominal supply pressure is greater than 150 mbar, with a possible variation between 20 mbar and the nominal power.

De plus, l'injecteur de premier étage 22 est calibré pour donner un débit d'injection approprié à la pression fournie par le pré-injecteur 21.In addition, the first stage injector 22 is calibrated to give an injection rate appropriate to the pressure supplied by the pre-injector 21.

Selon la deuxième variante de réalisation représentée à la figure 6, la vanne thermostatique 26 est disposée en aval de la valve de sécurité 7.According to the second variant shown in Figure 6, the thermostatic valve 26 is disposed downstream of the safety valve 7.

L'injecteur de premier étage 27 est raccordé directement à une des sorties de la valve de sécurité 7 par une conduite de dérivation 28 et se trouve disposé en lieu et place de l'injecteur de deuxième étage (14 ou 23) des variantes précédentes, c'est-à-dire incliné par rapport à l'axe de la conduite, et en retrait par rapport à l'injecteur de deuxième étage 29 qui lui s'étend dans l'axe de la conduite.The first stage injector 27 is directly connected to one of the valve outputs safety 7 by a bypass line 28 and is located arranged in place of the second stage injector (14 or 23) of the preceding variants, that is to say inclined relative to the axis of the pipe, and set back by compared to the second stage injector 29 which extends to it in line with the pipe.

En outre, l'injecteur de premier étage 27 étant alimenté avec une pression de gaz fixe correspondant à la pression nominale, un obstacle 30, consistant en une vis faisant saillie à l'intérieur de la conduite, est disposé de façon à intercepter le flux de gaz délivré par cet injecteur en vue de ralentir la vitesse du jet de gaz et de diminuer la quantité d'air entraínée par ce dernier.In addition, the first stage injector 27 being supplied with a corresponding fixed gas pressure at nominal pressure, an obstacle 30, consisting of a screw protruding inside the pipe, is arranged to intercept the flow of gas delivered by this injector in order to slow down the speed of the gas jet and decrease the amount of air entrained by the latter.

A noter qu'en variante et tel que représenté en trait pointillé, l'injecteur de premier étage 27 peut être adapté pour présenter une longueur telle que sa buse d'injection soit disposée en avant de celle de l'injecteur de deuxième étage 29. Dans ce cas l'obstacle 30 est inutile.Note that as a variant and such that shown in dotted lines, the first stage injector 27 can be adapted to have a length such that its injection nozzle is arranged in front of that of the second stage injector 29. In this case the obstacle 30 is useless.

Un tel mode de réalisation est particulièrement adapté pour des installations de chauffage dont la pression nominale d'alimentation est comprise entre 100 et 150 mbars, et constitue une solution particulièrement économique.One such embodiment is particularly suitable for heating installations whose nominal supply pressure is between 100 and 150 mbar, and is a solution particularly economical.

Selon la troisième variante représentée à la figure 7, l'injecteur de premier étage 31 est similaire à celui du mode de réalisation précédent, c'est-à-dire raccordé directement à la valve de sécurité 7 par une conduite de dérivation 32, disposé de façon inclinée par rapport à l'axe de la conduite, en retrait par rapport à l'injecteur de deuxième étage 33, et associé à un obstacle 34 interceptant le flux de gaz.According to the third variant shown in Figure 7, the first stage injector 31 is similar to that of the previous embodiment, that is to say connected directly to the safety valve 7 by a bypass line 32, inclined at an angle relative to the axis of the pipe, set back from the second stage injector 33, and associated with an obstacle 34 intercepting the gas flow.

L'injecteur de deuxième étage 33 s'étend quant à lui dans l'axe de la conduite et est monté sur l'extrémité d'un tube 35 porte-injecteur, solidarisé vers son autre extrémité sur le corps 36 de la vanne thermostatique 37, tel que représenté à la figure 8.The second stage injector 33 extends meanwhile in line with the pipe and is mounted on the end of an injector holder tube 35, secured to its other end on the valve body 36 thermostatic 37, as shown in FIG. 8.

Ce tube porte-injecteur 35 loge, en outre, un pointeau 38 présentant une extrémité effilée de section adaptée pour pénétrer dans la buse d'injection de l'injecteur 33, de façon à engendrer des variations de débit fonctions de la position relative de ladite extrémité effilée par rapport à ladite buse d'injection. Ce pointeau 38 présente, en outre, une longueur adaptée pour que son extrémité opposée à son extrémité effilée s'étende dans le prolongement du tube porte-injecteur 35.This injector holder tube 35 also houses a needle 38 having a tapered section end suitable for entering the injection nozzle of the injector 33, so as to generate variations in flow functions of the relative position of said end tapered relative to said injection nozzle. This needle 38 has, moreover, a suitable length so that its end opposite its tapered end extends into the extension of the injector tube 35.

La vanne thermostatique 37 comporte quant à elle un corps de vanne divisé en deux moitié de corps 36a, 36b, délimitant une gorge interne annulaire logeant la périphérie d'une membrane 39.Thermostatic valve 37 includes a valve body divided into two body half 36a, 36b, delimiting an annular internal groove housing the periphery of a membrane 39.

Une de ces moitiés de corps 36a comporte un orifice taraudé 40 frontal pour la fixation du tube porte-injecteur 35, et un orifice taraudé latéral 41 destiné au raccordement de la vanne thermostatique 37 avec la valve de sécurité 7.One of these body halves 36a has a tapped hole 40 front for fixing the nozzle holder tube 35, and a lateral threaded orifice 41 intended for the connection of the thermostatic valve 37 with the valve security 7.

Cette moitié de corps 36a comporte, en outre, un siège 42 coaxial avec l'orifice taraudé frontal 40, et communiquant avec ledit orifice frontal par l'intermédiaire d'un alésage 43 débouchant dans les fonds respectifs desdits orifice et siège.This half of body 36a comprises, in additionally, a seat 42 coaxial with the front threaded orifice 40, and communicating with said front orifice by through a bore 43 opening into the bottoms respective said orifice and seat.

La deuxième moitié de corps 36b délimite quant à elle une chambre interne 44 dotée d'un trou d'event 45 assurant la mise à la pression atmosphérique de ladite chambre.The second half of body 36b delimits an internal chamber 44 with a vent hole 45 ensuring that said air is brought to atmospheric pressure bedroom.

La vanne thermostatique 37 comporte, en outre, un clapet 46 de forme adaptée pour coopérer avec le siège 42, et un soufflet classique 47 à fluide dilatable, disposés de part et d'autre de la membrane, en appui contre une pièce flottante 48 solidaire de ladite membrane.The thermostatic valve 37 comprises, in in addition, a valve 46 of a shape adapted to cooperate with the seat 42, and a conventional bellows 47 with expandable fluid, arranged on either side of the membrane, bearing against a floating part 48 secured to said membrane.

Cette vanne thermostatique 37 et le tube porte-injecteur 35 sont agencés, tel que représenté à la figure 8, de façon que le pointeau 38 vienne en butée contre le clapet 46, et soit déplacé dans le sens de l'obturation de la buse d'injection lors d'un allongement du soufflet 47.This thermostatic valve 37 and the tube injector holder 35 are arranged, as shown in the Figure 8, so that the needle 38 comes into abutment against valve 46, and is moved in the direction of plugging the injection nozzle during elongation bellows 47.

Le mouvement inverse, tendant à augmenter la section de passage de gaz de la buse d'injection est quant à lui obtenu au moyen d'un ressort 48 disposé autour du pointeau 38, en butée contre un épaulement interne du tube porte-injecteur 35, et une collerette 49 solidaire dudit pointeau.The reverse movement, tending to increase the gas passage section of the injection nozzle is meanwhile obtained by means of a spring 48 arranged around of needle 38, in abutment against an internal shoulder of the injector tube 35, and a flange 49 integral said needle.

Un tel mode de réalisation est particulièrement adapté pour des installations de chauffage dont la pression d'alimentation est de l'ordre de 100 mbars, équipée d'appareils de chauffage à grosse puissance calorifique (5 000 à 10 000 Watts). De plus, l'ouverture et la fermeture progressives de la buse d'injection de l'injecteur de deuxième étage 33 permet d'obtenir une vitesse de gaz optimale à tous les régimes.One such embodiment is particularly suitable for heating installations whose supply pressure is around 100 mbar, fitted with high power heaters heat (5,000 to 10,000 Watts). In addition, the opening and the progressive closing of the injection nozzle of the second stage injector 33 provides a optimal gas speed at all speeds.

Le mode de réalisation représenté aux figures 9 et 10 vise, enfin, un appareil de chauffage équipant une installation de chauffage dotée de moyens de régulation centralisés telle que celle schématisée à la figure 1.The embodiment shown in Figures 9 and 10 is, finally, a heater equipping a heating installation provided with means of centralized regulation such as that shown schematically in the figure 1.

Cet appareil de chauffage comporte un injecteur de premier étage 50 raccordé directement à la valve de sécurité 7 par une conduite de dérivation 51, et solidarisé sur l'excroissance interne 17 de la conduite, de façon à s'étendre selon un axe incliné par rapport à l'axe de ladite conduite.This heater has a first stage injector 50 connected directly to the safety valve 7 via a bypass line 51, and secured to the internal protrusion 17 of the pipe, so as to extend along an axis inclined with respect to the axis of said pipe.

L'injecteur de deuxième étage 52 s'étend quant à lui dans l'axe de la conduite, en avant de l'injecteur de premier étage 50, et est monté sur l'extrémité d'un tube 53 porte-injecteur solidarisé, vers son autre extrémité, sur le corps d'une valve à membrane 54 telle que représenté à la figure 10.The second stage injector 52 extends meanwhile in the axis of the pipe, in front of the first stage injector 50, and is mounted on the end of a tube 53 integral with the injector holder, towards its other end, on the body of a membrane valve 54 as shown in Figure 10.

Ce tube porte-injecteur 53 loge, en outre, un pointeau 55 présentant une extrémité effilée de section adaptée pour pénétrer dans la buse d'injection de l'injecteur 52, de façon à engendrer des variations de débit fonctions de la position relative de ladite extrémité effilée par rapport à ladite buse d'injection. Ce pointeau 55 présente, en outre, une longueur adaptée pour que son extrémité opposée à son extrémité effilée s'étende dans le prolongement du tube porte-injecteur 53.This injector holder tube 53 also houses a needle 55 having a tapered section end suitable for entering the injection nozzle of the injector 52, so as to generate variations in flow functions of the relative position of said end tapered relative to said injection nozzle. This needle 55 has, moreover, a length adapted so that its end opposite its tapered end extends into the extension of the injector tube 53.

La valve à membrane 54 comporte quant à elle un corps de vanne divisé en deux moitiés de corps 54a, 54b délimitant une gorge interne annulaire logeant la périphérie d'une membrane 56.The membrane valve 54 includes it has a valve body divided into two body halves 54a, 54b delimiting an annular internal groove housing the periphery of a membrane 56.

Une de ces moitiés de corps 54a comporte un orifice taraudé frontal 57 pour la fixation du tube porte-injecteur 53, et un orifice taraudé latéral 58 destiné au raccordement de la valve à membrane 54 avec la valve de sécurité 7.One of these body halves 54a has a front threaded hole 57 for fixing the nozzle holder tube 53, and a lateral threaded orifice 58 intended for the connection of the membrane valve 54 with the valve security 7.

La deuxième moitié de corps 54b délimite quant à elle une chambre interne 59 dotée d'un trou d'évent 60 assurant la mise à la pression atmosphérique de ladite chambre, à l'intérieur de laquelle débouche l'orifice frontal taraudé 57.The second half of body 54b delimits an internal chamber 59 with a vent hole 60 ensuring that said air is brought to atmospheric pressure chamber, inside which opens the orifice threaded front 57.

Cette valve à membrane comporte , enfin de façon classique, un ressort 61 logé dans la chambre 59, s'appuyant par une extrémité sur une pièce flottante 62 solidaire de la membrane 56, et par son autre extrémité sur une butée mobile 63 dont la position est commandée par une vis de réglage 64.This membrane valve finally comprises conventionally, a spring 61 housed in the chamber 59, supported by one end on a floating part 62 integral with the membrane 56, and by its other end on a movable stop 63 whose position is controlled by a adjusting screw 64.

Cette valve à membrane 54 et le tube porte-injecteur 53 sont agencés pour que le pointeau 55 soit solidarisé à la pièce flottante 62 et soit déplacé longitudinalement en fonction de la pression du gaz d'alimentation modulée par les moyens de régulation centralisés.This diaphragm valve 54 and the injector tube 53 are arranged so that the needle 55 is secured to the floating part 62 and is moved longitudinally as a function of gas pressure supply modulated by regulation means centralized.

De plus, le tube porte-injecteur 53 forme un siège 65, et le pointeau 55 présente une collerette en forme de soupape 66 apte à obturer le siège 65, dans la position déployée du ressort 58 correspondant à une pression d'alimentation de gaz inférieure au seuil préréglé de fermeture de la valve à membrane 54.In addition, the injector tube 53 forms a seat 65, and the needle 55 has a flange in valve form 66 capable of closing the seat 65, in the deployed position of the spring 58 corresponding to a gas supply pressure below preset threshold for closing the diaphragm valve 54.

Comme le mode de réalisation précédemment décrit, cette version est particulièrement adaptée pour des installations de chauffage dont la pression d'alimentation est de l'ordre de 100 mbars, équipée d'appareils de chauffage de grosse puissance.As the embodiment previously described, this version is particularly suitable for heating systems including supply pressure is around 100 mbar, fitted with large power heating.

La figure 11 est un schéma de principe des vannes thermostatiques 19, 26 équipant les dispositifs représentés au figures 5 et 6.Figure 11 is a block diagram of thermostatic valves 19, 26 fitted to the devices shown in Figures 5 and 6.

Cette vanne thermostatique est divisée en deux chambres 67, 68 par une membrane 69 solidarisée au niveau de sa périphérie au corps de vanne, et portant une pièce flottante 70.This thermostatic valve is divided into two chambers 67, 68 by a membrane 69 secured to the level from its periphery to the valve body, and carrying a floating part 70.

Cette vanne comporte classiquement, d'une part, un clapet 71 venant en appui contre la pièce flottante 70 et sollicité dans le sens de l'ouverture de ladite vanne par un ressort 72, et d'autre part, un soufflet 73 à fluide dilatable venant en appui contre la face opposée de la pièce flottante 70 en vue de solliciter le clapet 71 dans le sens de la fermeture, lors de son allongement.This valve conventionally comprises, of a hand, a valve 71 bearing against the workpiece floating 70 and biased in the direction of opening of said valve by a spring 72, and on the other hand, a bellows 73 with expandable fluid bearing against the opposite side of the floating part 70 in order to urge the valve 71 in the closing direction, when it elongation.

La figure 12 est quant à elle un schéma de principe des valves à membrane 16, 25 équipant les dispositifs représentés aux figures 4 et 5.Figure 12 is a diagram of principle of the membrane valves 16, 25 equipping the devices shown in Figures 4 and 5.

Cette valve à membrane est divisée en deux chambres 74, 75 par une membrane 76 portant une pièce flottante 77.This diaphragm valve is divided in two chambers 74, 75 by a membrane 76 carrying a part floating 77.

A l'intérieur d'une des chambres 74 se trouve un clapet 78 solidaire de la pièce flottante 77, tandis que l'autre chambre 75 renferme un ressort 79 s'appuyant par une extrémité contre la pièce flottante 77, et, par son extrémité opposée, contre une butée mobile 80 dont la position est réglée par une vis de réglage 81.Inside one of the bedrooms 74 is finds a valve 78 integral with the floating part 77, while the other chamber 75 contains a spring 79 pressing at one end against the floating part 77, and, by its opposite end, against a movable stop 80 the position of which is adjusted by an adjusting screw 81.

Claims (15)

  1. A device for injecting and regulating between a so-called idle minimum power and a so-called rated ma>:imum power, for an atmospheric infrared gas burner of heating devices (1), particularly of the infrared type, comprising an air supply conduit with an air inlet mouth (6) and a Venturi member (5), said device comprising gas injection means connected to gas supply conduit means (8, 15; 8, 24; 8, 28; 8, 32; 8, 51) positioned in the air supply conduit of each burner upflow of the Venturi member (5), and means (10-12, 16; 19, 25; 26; 37; 10-12, 54) for regulating the amount of gas supplied to the injection means, and characterized in that:
    the injection means comprise at least two injectors (13, 14; 22, 23; 27, 29; 31, 33; 50, 52), of which one so-called first stage injector (13; 22; 27; 31; 50) and at least one so-called second stage injector (14; 23; 29; 33; 52), each having an injection nozzle, said injection nozzle being positioned in the air supply conduit, upflow of the Venturi member (5), the respective injection nozzles being offset from each other longitudinally and directed so that the flow axis thereof converges towards a so-called focus region of the Venturi member (5), said focus region being positioned on the axis of the air supply conduit (4) in the region of said Venturi member,
    the gas supply conduit means (8, 15; 8, 24; 8, 28; 8, 32; 8, 51) are adapted to direct permanently to the first stage injector (13; 22; 27; 31; 50) an amount of gas at least equal to the amount of gas necessary to obtain the idle power,
    the regulation means (10-12, 16; 19, 25; 26; 37; 10-12, 54) are adapted to control the supply to each second stage injector (14; 23; 29; 33; 52) in accordance with temperature control data, in order to obtain the desired power.
  2. The injection and regulation device according to claim 1, characterized in that one (13; 22; 29; 33; 52) of the injectors is positioned on the axis of the air supply conduit, each (14; 23; 27; 31; 50) of the other injectors being tilted in relation to said axis in order to converge towards same.
  3. The injection and regulation device according to one of claims 1 or 2, characterized in that at least one (33; 52) of the second stage injectors is mounted on an injector carrying tube (35; 53) accomodating a spindle (38; 55) having a tapered end with a cross-section adapted to penetrate the injection nozzle, said spindle being associated with actuation means (38, 46, 47; 61) able to move it in order to bring it either in a position blocking the gas supply to the injector (33; 52) or in regulating positions in which said spindle generates througput variations in accordance with its position.
  4. The injection and regulation device according to one of the preceding claims, comprising centralized regulation means (10-12) mounted on a main conduit (9) supplying gas to a plurality of heating devices (1) and able to regulate the gas pressure inside the main conduit (9) in accordance with temperature control data, said device being characterized in that:
    each first stage injector (13; 50) of each burner is connected to the main conduit (9) so that the gas supply pressure of said injector is as determined by the regulation means (10-12),
    each second stage injector (14; 52) of each burner is connected to the main conduit (9) by means of a conduit (15) in which a valve (16; 54) is interposed, said valve being able to block said conduit when the gas pressure in said conduit is reduced below a predetermined threshold.
  5. The injection and regulation device according to claim 4, characterized in that each valve is a membrane valve (16) comprising two chambers (74, 75) separated from each other in a gas-tight manner by means of a membrane (76), namely:
    one chamber (74) having a feeding inlet and a feeding outlet forming a seat, and accomodating a poppet (78) rigidly attached to the membrane (76) and able to block the seat,
    one chamber (75) accomodating resilient means (79) able to bias the membrane (76) towards the blocking of the seat by the poppet (78).
  6. The injection and regulation device according to claim 4, characterized in that at least one (52) of the second stage injectors is mounted on an injector-carrying tube (53) acomodating a spindle (55) having a tapered end with a cross-section adapted to penetrate the injection nozzle, said injector-carrying tube being associated with a valve (54) having a movable member and the spindle (55) being rigidly attached to the movable member of said valve and being aligned with said movable member in order to bring said spindle in regulating positions in which said spindle generates throughput variations in accordance with its position.
  7. The injection and regulation device according to one of claims 1 to 3, characterized in that the regulation means are of the individual type and comprise a controlled valve (19; 26; 37) for regulating the gas throughput, said controlled valve being associated with each heating device burner and connected to a main gas supply conduit (8).
  8. The injection and regulation device according to claim 7, characterized in that:
    each first stage injector (22) of each burner is connected to the associated controlled valve (19) by means of a conduit having a section (20) branched from said valve, comprising an idling pre-injector (21) having a gauge adapted to create a pressure drop able to establish a gas pressure corresponding to the idle power of the burner, in the closing position of the controlled valve (19),
    each second stage injector (23) of each burner is connected to the supply conduit of the first stage injector (22) by means of a conduit (24) on which a valve (25) is interposed, said valve being able to block said conduit when the gas pressure therein is reduced below a predetermined threshold.
  9. The injection and regulation device according to claim 8, characterized in that the idling pre-injector (21) is an injector of the conventional type comprising a body forming a cup having an injection opening near one of the ends thereof, said injector being positioned "haid-to-tail" so that the gas penetrates through the injection opening.
  10. The injection and regulation device according to one of claims 8 or 9, characterized in that each valve (25) is a membrane valve comprising two chambers (74, 75) separated from each other in a gas-tight manner by means of a membrane (76), namely:
    one chamber (74) having a feeding inlet and a feeding outlet forming a seat, and accomodating a poppet (78) rigidly attached to the membrane (76) and able to block the seat,
    one chamber (75) accomodating resilient means (79) able to bias the membrane (76) towards the blocking of the seat by the poppet (78).
  11. The injection and regulation device according to claim 7, characterized in that:
    each first stage injector (27; 31) of each burner is connected to a conduit (28; 32) connected upflow of the associated controlled valve (26; 37) so that the gas supply pressure of said injector is that of the main gas supply conduit (8),
    each second stage injector (29; 33) of each burner is connected to a conduit connected downflow of the associated controlled valve (26; 37).
  12. The injection and regulation device according to claim 11, characterized in that it comprises a second stage injector (29; 33) positioned on the axis of the air supply conduit and a first stage injector tilted in relation to said axis in order to converge towards said axis, and positioned so that the injection nozzle thereof is offset longitudinally towards the front in relation to that of the second stage injector (29; 33).
  13. The injection and regulation device according to claim 11, characterized in that it comprises a second stage injector (29; 33) positioned on the axis of the air supply conduit and a first stage injector (27; 31) tilted in relation to said axis in order to converge towards said axis, and positioned so that the injection nozzle thereof is offset longitudinally towards the rear in relation to that of the second stage injector (29; 33), said device comprising then a barrier (30; 34) positioned so as to intercept the gas flow outputted by the first stage injector (27; 31).
  14. The injection and regulation device according to one of claims 11 to 13, wherein the controlled valve (37) comprises a valve body having a fluid inlet (41) and a fluid outlet (42), and a poppet (46) able to block the fluid outlet under the effect of an expansible thermostatic member (47), said device being characterized in that it comprises a second stage injector (33) mounted on an injector-carrying tube (35) accomodating a spindle (38) having a tapered end with a cross-section adapted to penetrate the injection nozzle:
    the injector-carrying tube (35) being rigidly attached to the body of the controlled valve (37) so as to be positioned in the prolongment of the fluid outlet (42) of the latter,
    the spindle (38) being positioned so as to be displaced by the poppet (46) of the controlled valve (37) in the direction of closing the injection nozzle during a movement generating a reduction of the gas throughput,
    the spindle (38) being associated with resilient means (48) able to bias a movement of said spindle in a direction of opening the injection nozzle.
  15. The injection and regulation device according to one of claims 11 to 14, characterized in that the controlled valve is a thermostatic valve comprising two chambers (67, 68) separated from each other in a gas-tight manner by means of a membrane (69), namely:
    one chamber (68) having a feeding inlet and a feeding outlet forming a seat, and accomodating a poppet (71) supported on the membrane (69) and able to block the seat,
    one chamber (67) accomodating an expansible fluid thermostatic member (73) supported on the membrane (69) in order to bias said membrane in a direction of opening.
EP94202045A 1993-07-23 1994-07-14 Injection and control device for atmospheric gas burners of heating appliances, in particular the infrared type Expired - Lifetime EP0635679B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9309379 1993-07-23
FR9309379A FR2708085B1 (en) 1993-07-23 1993-07-23 Injection and control devices for atmospheric gas burners operating at low nominal pressure.

Publications (2)

Publication Number Publication Date
EP0635679A1 EP0635679A1 (en) 1995-01-25
EP0635679B1 true EP0635679B1 (en) 1998-10-07

Family

ID=9449778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94202045A Expired - Lifetime EP0635679B1 (en) 1993-07-23 1994-07-14 Injection and control device for atmospheric gas burners of heating appliances, in particular the infrared type

Country Status (6)

Country Link
US (1) US5549099A (en)
EP (1) EP0635679B1 (en)
JP (1) JPH07269850A (en)
DE (1) DE69413756T2 (en)
ES (1) ES2124362T3 (en)
FR (1) FR2708085B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0754914B1 (en) * 1995-07-19 2001-04-18 Centre D'etude Et De Realisations D'equipement Et De Materiel (C.E.R.E.M.) S.A.R.L. Atmospheric gas burner injecting device, in particular for infrared type heaters
DE29908550U1 (en) 1999-05-14 1999-08-12 Honeywell B.V., Amsterdam Device for generating a mixture of gas and combustion air for a burner
US8246344B1 (en) * 2003-07-29 2012-08-21 Samuel Schrock Gas lamp
US9328937B2 (en) 2011-06-07 2016-05-03 L.B. White Company, Inc. Variable rate heating for agricultural purposes
DE102012106230A1 (en) 2012-07-11 2014-05-15 Kraussmaffei Technologies Gmbh Komponentenzufuhrdüse
DE102018104209C5 (en) 2018-02-23 2023-11-30 Hennecke Gmbh Component mixing nozzle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE535137C (en) * 1931-10-03 Ignis Huettenbaugesellschaft M Mixing nozzle burner with several nozzles
US2939524A (en) * 1957-08-29 1960-06-07 Roper Corp Geo D Control system for gas burners
US3599661A (en) * 1970-02-05 1971-08-17 Walton W Cushman Self-modulating gas burner
DE2151611A1 (en) * 1971-10-16 1973-04-19 Rheinstahl Ag ATMOSPHERIC GAS BURNER
JPS5888273A (en) * 1981-11-19 1983-05-26 Paloma Ind Ltd Device for preventing fall of service gas pressure
FR2642821A1 (en) * 1989-02-07 1990-08-10 Etu Realisa Equip Materie Cent INFRARED GAS RADIANT WITH PRE-DIFFUSION CHAMBER AND HIGH-TEMPERATURE FUSE THERMOCOUPLE

Also Published As

Publication number Publication date
DE69413756T2 (en) 1999-06-17
JPH07269850A (en) 1995-10-20
DE69413756D1 (en) 1998-11-12
FR2708085B1 (en) 1996-05-24
FR2708085A1 (en) 1995-01-27
US5549099A (en) 1996-08-27
EP0635679A1 (en) 1995-01-25
ES2124362T3 (en) 1999-02-01

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