EP0295157B1 - Air distributing device for forced draught operated burner - Google Patents

Air distributing device for forced draught operated burner Download PDF

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Publication number
EP0295157B1
EP0295157B1 EP88401130A EP88401130A EP0295157B1 EP 0295157 B1 EP0295157 B1 EP 0295157B1 EP 88401130 A EP88401130 A EP 88401130A EP 88401130 A EP88401130 A EP 88401130A EP 0295157 B1 EP0295157 B1 EP 0295157B1
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EP
European Patent Office
Prior art keywords
slots
air
burner
turbine
sleeve
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Expired - Lifetime
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EP88401130A
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German (de)
French (fr)
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EP0295157A1 (en
Inventor
Nicolas Chaumier
Roland Kalms
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AIRELEC INDUSTRIES
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AIRELEC INDUSTRIES
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Priority to AT88401130T priority Critical patent/ATE58785T1/en
Publication of EP0295157A1 publication Critical patent/EP0295157A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/008—Flow control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/001—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space spraying nozzle combined with forced draft fan in one unit

Definitions

  • the present invention relates to an air distribution device for a supply air burner, of the type comprising, downstream of a turbine arranged laterally with respect to the burner, a certain number of longitudinal slots distributed over a cylindrical surface disposed axially with respect to the burner and a plug capable of being actuated in the axial direction in order to partially close said slots for the purpose of adjusting the air intake (see, for example, DE-A 3 433 201).
  • the air-fuel, or more generally oxidant-fuel, mixture is produced in a flame tube comprising a flame holder whose purpose is to rotate an air mass.
  • the intimate air-fuel mixture must be as homogeneous as possible in order to obtain complete combustion. An excess of air is therefore expected, but for reasons of efficiency, this should be as small as possible.
  • no area of the mixture, and therefore of the flame must be locally lacking air.
  • combustion air which passes through the flame tube is generally divided into a so-called primary air flow, rotated by the flame holder, which mixes directly with the fuel, and an air flow said secondary, passing around the flame holder and which has the function of "pinching" the flame and ventilating its periphery.
  • a burner is designed to respond to a certain range of power between a maximum power and a minimum power. Consequently, since the quality of combustion must be maintained over the entire power range, it is necessary, once the calorific flow rate has been set, to adjust the air flow rate to its fair value.
  • the main object of the present invention is therefore to remedy these drawbacks and, to do this, it relates to an air distribution device of the aforementioned type which is essentially characterized in that the passage section of said slots increases progressively as and as one is further away from the air flow generated by the turbine.
  • the slots have a point-shaped profile and are oriented with respect to the plug so that the point corresponds to the lowest air flow.
  • the profile of the slots is designed so that the variation in passage cross section between the different slots varies as a function of the axial position of the plug.
  • the variation is practically zero for low air flows, increasing for average flows and constant for large flows.
  • the burner shown in FIG. 1 comprises first of all, in a manner known per se, a flame tube or barrel 1 inside which is disposed a fuel injector 2.
  • the flame tube 1 is fixed on a cylindrical casing 3 into which there opens laterally a sheath 4 fitted with a turbine 5 intended to blow air inside the burner.
  • the casing is closed by a cover 6, commonly known as the combustion head cover.
  • the fuel injector 2 is centered inside the flame tube 1 by means of a sliding sleeve 7 on which are fixed four wings 8 which come to bear on the inner wall of the tube.
  • the injector ends with a nozzle 9 and in front of the nozzle is arranged a flame catch 10 provided in its center with stamped cutouts 11.
  • the flame catch is fixed on the front end of the wings 8 and is supported at its periphery on six fins 12 integral with the wall of the flame tube 1.
  • the air blown inside the burner by the turbine 5 is thus divided into a primary flow rotated by the cutouts 11 and a secondary flow which passes around the flame holder 10.
  • the position of the flame holder relative to the nozzle 9 can be adjusted by means of a fixing screw 13 intended to make the sliding sleeve 7 integral with the injector.
  • the injector is extended by a fuel supply tube 14, for example fuel oil, which passes axially through the cover 6 via an opening 15.
  • a fuel supply tube 14 for example fuel oil
  • An adjustment knob 16 accessible from the exterior and cooperating with a threaded part of the tube 14, allows the position of the injector / flame holder assembly to be adjusted inside the flame tube 1. The rotation of this assembly is prevented by a tongue 17, integral of the tube 14 and engaging in a slot 18 provided on the cover 6.
  • An electrical fuel preheater 19 is also provided on the injector 2, the supply cable 20 of which passes through the cover 6 via an opening 21.
  • the burner is ignited by means of two electrodes such as 22, each supported by an electrode holder 23 and whose high-voltage power cable 24 passes through the cover via an opening 25.
  • the cover 6 further comprises an inspection eyelet 26 and an opening 27 for the establishment of a photoresist cell 28 for detecting the presence of the flame.
  • the cover 6 is provided on its internal wall with a cylindrical surface 29, disposed axially with respect to the burner and in which a number of longitudinal slots 30 are formed through which the air blown by the turbine 5 gets inside the burner.
  • the passage section of these slots 30 is controlled by means of a cylindrical plug 31, placed inside the cylindrical surface 29 and which is capable of moving axially under the action of a system of screws 32 and nut 33.
  • the screw 32 is rotatably mounted in an opening 34 of the cover 6 so as to be accessible from the outside, while the nut 33 is made integral with the plug 31 by means of a tongue 35.
  • this tongue 35 protrudes outside through a slot 36 in the cover, thus forming a strip 37 which is advantageously provided with graduations making it possible to control the position of the plug.
  • the passage section of the different slots 30 is not identical over the entire periphery of the surface 29, but gradually increases as one is further from the air flow generated by the turbine 5.
  • the slots formed in the cylindrical surface 29 are smaller on the side of the turbine 5 than on the opposite side, this in order to equalize the air flows as a function of the general direction of the flow.
  • each slot is double due to the presence in the center of a symmetrical triangular tooth with double slope 40.
  • the passage section of the slot thus depends both on the total height of the tooth and the height of the slope change. Thanks to this arrangement, the variation in passage cross-section, or asymmetry, between the different slots, changes as a function of the axial position of the plug 31.

Abstract

The device is of the type comprising, downstream of a turbine (5) arranged laterally in relation to the burner, a given number of longitudinal slots (30) distributed over a cylindrical surface (29) arranged axially in relation to the burner and a plug (31) capable of being operated in the axial direction in order to close partially said slots with a view to regulating the admission of air, characterised in that the passage cross-section of said slots (30) increases progressively as the distance from the flow of air generated by the turbine (5) increases. <IMAGE>

Description

La présente invention concerne un dispositif de distribution d'air pour brûleur à air soufflé, du type comprenant, en aval d'une turbine disposée latéralement par rapport au brûleur, un certain nombre de fentes longitudinales réparties sur une surface cylindrique disposée axialement par rapport au brûleur et un boisseau susceptible d'être actionné dans le sens axial afin d'obturer partiellement lesdites fentes en vue du réglage de l'admission d'air (voir, par exemple, le DE-A 3 433 201).The present invention relates to an air distribution device for a supply air burner, of the type comprising, downstream of a turbine arranged laterally with respect to the burner, a certain number of longitudinal slots distributed over a cylindrical surface disposed axially with respect to the burner and a plug capable of being actuated in the axial direction in order to partially close said slots for the purpose of adjusting the air intake (see, for example, DE-A 3 433 201).

Dans les brûleurs à air soufflé, fonctionnant au fioul, au gaz naturel, ou à d'autres combustibles, on réalise le mélange air-combustible, ou plus généralement comburant-combustible, dans un tube de flamme comprenant un accroche-flamme dont le but est de mettre en rotation une masse d'air. De plus, le mélange intime air-combustible doit être le plus homogène possible afin d'obtenir une combustion complète. On prévoit donc un excès d'air, mais pour des raisons de rendement, celui-ci devra être le plus réduit possible. Cependant, pour éviter les traces de produits de combustion incomplète, aucune zone du mélange, donc de la flamme, ne doit se trouver localement en défaut d'air.In blown air burners, operating on fuel oil, natural gas, or other fuels, the air-fuel, or more generally oxidant-fuel, mixture is produced in a flame tube comprising a flame holder whose purpose is to rotate an air mass. In addition, the intimate air-fuel mixture must be as homogeneous as possible in order to obtain complete combustion. An excess of air is therefore expected, but for reasons of efficiency, this should be as small as possible. However, to avoid traces of products of incomplete combustion, no area of the mixture, and therefore of the flame, must be locally lacking air.

Par ailleurs, l'air comburant qui passe dans le tube de flamme se divise généralement en un flux d'air dit primaire, mis en rotation par l'accroche-flamme, qui se mélange directement avec le combustible, et un flux d'air dit secondaire, passant autour de l'accroche-flamme et qui a pour fonction de "pincer" la flamme et d'aérer son pourtour.In addition, the combustion air which passes through the flame tube is generally divided into a so-called primary air flow, rotated by the flame holder, which mixes directly with the fuel, and an air flow said secondary, passing around the flame holder and which has the function of "pinching" the flame and ventilating its periphery.

Il apparaît donc à l'évidence qu'il est très important d'obtenir une homogénéité des vitesses d'air dans le tube de flamme, en avant de l'accroche-flamme. En outre, un brûleur est étudié pour répondre à une certaine gamme de puissance comprise entre une puissance maximale et une puissance minimale. Par suite, comme la qualité de la combustion doit être maintenue sur toute la gamme de puissance, il est nécessaire, une fois le débit calorifique fixé, d'ajuster le débit d'air à sa juste valeur.It is therefore obvious that it is very important to obtain homogeneity of the air speeds in the flame tube, in front of the flame holder. In addition, a burner is designed to respond to a certain range of power between a maximum power and a minimum power. Consequently, since the quality of combustion must be maintained over the entire power range, it is necessary, once the calorific flow rate has been set, to adjust the air flow rate to its fair value.

Or, les dispositifs de distribution d'air connus jusqu'à maintenant ne permettent pas d'assurer, quel que soit le débit d'air, une distribution parfaitement homogène. Généralement, on constate une baisse de la qualité du mélange lorsque la puissance diminue et cela est particulièrement sensible lorsque le combustible utilisé est le fioul et que la puissance atteint le bas de gamme des puissances de chauffage domestique, soit environ 10 à 15 kW.However, the air distribution devices known until now do not ensure, whatever the air flow, a perfectly homogeneous distribution. Generally, there is a decrease in the quality of the mixture when the power decreases and this is particularly noticeable when the fuel used is fuel oil and the power reaches the low end of the domestic heating powers, that is to say around 10 to 15 kW.

La présente invention a donc pour but principal de remédier à ces inconvénients et, pour ce faire, elle a pour objet un dispositif de distribution d'air du type susmentionné qui se caractérise essentiellement en ce que la section de passage desdites fentes augmente progressivement au fur et à mesure que l'on se trouve plue éloigné du flux d'air engendré par la turbine.The main object of the present invention is therefore to remedy these drawbacks and, to do this, it relates to an air distribution device of the aforementioned type which is essentially characterized in that the passage section of said slots increases progressively as and as one is further away from the air flow generated by the turbine.

Grâce à cette disposition, il est possible d'égaliser les débits en fonction de la direction générale du flux d'air et donc d'obtenir une plus grande homogénéité dans le tube de flamme.Thanks to this arrangement, it is possible to equalize the flow rates as a function of the general direction of the air flow and therefore to obtain greater homogeneity in the flame tube.

De préférence, les fentes ont un profil en forme de pointe et sont orientées par rapport au boisseau de manière que la pointe corresponde au débit d'air le plus faible.Preferably, the slots have a point-shaped profile and are oriented with respect to the plug so that the point corresponds to the lowest air flow.

On obtient ainsi une précision de réglage à peu près constante sur toute la gamme de puissance du brûleur.An almost constant adjustment precision is thus obtained over the entire power range of the burner.

Dans une forme de réalisation particulière de l'invention, le profil des fentes est conçu de manière que la variation de section de passage entre les différentes fentes évolue en fonction de la position axiale du boisseau. De préférence, la variation est pratiquement nulle pour les faibles débits d'air, croissante pour les débits moyens et constante pour les grands débits.In a particular embodiment of the invention, the profile of the slots is designed so that the variation in passage cross section between the different slots varies as a function of the axial position of the plug. Preferably, the variation is practically zero for low air flows, increasing for average flows and constant for large flows.

En effet, pour les faibles débits, l'équilibre s'effectue automatiquement, étant donné que la perte de charge est importante, tandis que pour les grands débits, on recherche surtout l'ouverture maximum.Indeed, for low flow rates, the balance takes place automatically, since the pressure drop is significant, while for large flow rates, the main objective is to seek maximum opening.

Une forme d'exécution de l' invention est décrite ci-après a titre d'exemple, en référence aux dessins annexés dans lesquels :

  • - la figure 1 est une vue en coupe longitudinale d'un brûleur à fioul équipé d'un dispositif de distribution d'air soufflé conforme à l'invention ;
  • - la figure 2 est une vue en bout du couvercle de la tête de combustion;
  • - la figure 3 est une vue en coupe suivant la ligne III-III de la figure 2 ;
  • - la figure 4 est une vue du côté intérieur du couvercle de la tête de combustion ;
  • - la figure 5 est une vue en coupe suivant la ligne V-V de la figure 4 ; et
  • - la figure 6 est une vue développée des fentes prévues sur le couvercle de la tête de combustion.
An embodiment of the invention is described below by way of example, with reference to the accompanying drawings in which:
  • - Figure 1 is a longitudinal sectional view of an oil burner equipped with a supply air supply device according to the invention;
  • - Figure 2 is an end view of the cover of the combustion head;
  • - Figure 3 is a sectional view along line III-III of Figure 2;
  • - Figure 4 is a view of the inner side of the combustion head cover;
  • - Figure 5 is a sectional view along line VV of Figure 4; and
  • - Figure 6 is a developed view of the slots provided on the cover of the combustion head.

Le brûleur représenté sur la figure 1 comprend tout d'abord, de façon connue en soi, un tube de flamme ou canon 1 à l'intérieur duquel est disposé un injecteur de combustible 2. Le tube de flamme 1 est fixé sur un carter cylindrique 3 dans lequel débouche latéralement une gaine 4 équipée d'une turbine 5 destinée à souffler de l'air à l'intérieur du brûleur. De l'autre côté, le carter est obturé par un couvercle 6, communément désigné sous le nom de couvercle de tête de combustion.The burner shown in FIG. 1 comprises first of all, in a manner known per se, a flame tube or barrel 1 inside which is disposed a fuel injector 2. The flame tube 1 is fixed on a cylindrical casing 3 into which there opens laterally a sheath 4 fitted with a turbine 5 intended to blow air inside the burner. On the other side, the casing is closed by a cover 6, commonly known as the combustion head cover.

L'injecteur de combustible 2 est centré à l'intérieur du tube de flamme 1 par l'intermédiaire d'un manchon coulissant 7 sur lequel sont fixées quatre ailes 8 venant prendre appui sur la paroi intérieure du tube. L'injecteur se termine par un gicleur 9 et devant le gicleur est disposé un accroche-flamme 10 pourvu en son centre de découpes embouties 11. L'accroche-flamme est fixé sur l'extrémité avant des ailes 8 et prend appui à sa périphérie sur six ailettes 12 solidaires de la paroi du tube de flamme 1. L'air soufflé à l'intérieur du brûleur par la turbine 5 se divise ainsi en un flux primaire mis en rotation par les découpes 11 et un flux secondaire qui passe autour de l'accroche-flamme 10. La position de l'accroche-flamme par rapport au gicleur 9 peut être réglée au moyen d'une vis de fixation 13 destinée à rendre le manchon coulisant 7 solidaire de l'injecteur.The fuel injector 2 is centered inside the flame tube 1 by means of a sliding sleeve 7 on which are fixed four wings 8 which come to bear on the inner wall of the tube. The injector ends with a nozzle 9 and in front of the nozzle is arranged a flame catch 10 provided in its center with stamped cutouts 11. The flame catch is fixed on the front end of the wings 8 and is supported at its periphery on six fins 12 integral with the wall of the flame tube 1. The air blown inside the burner by the turbine 5 is thus divided into a primary flow rotated by the cutouts 11 and a secondary flow which passes around the flame holder 10. The position of the flame holder relative to the nozzle 9 can be adjusted by means of a fixing screw 13 intended to make the sliding sleeve 7 integral with the injector.

A l'arrière, l'injecteur est prolongé par un tube 14 d'amenée du combustible, par exemple du fioul, qui traverse axialement le couvercle 6 par l'intermédiaire d'une ouverture 15. Un bouton de réglage 16, accessible de l'extérieur et coopérant avec une partie filetée du tube 14, permet d'ajuster la position de l'ensemble injecteur/accroche-flamme à l'intérieur du tube de flamme 1. La rotation de cet ensemble est empêchée par une languette 17, solidaire du tube 14 et venant en prise dans une fente 18 prévue sur le couvercle 6.At the rear, the injector is extended by a fuel supply tube 14, for example fuel oil, which passes axially through the cover 6 via an opening 15. An adjustment knob 16, accessible from the exterior and cooperating with a threaded part of the tube 14, allows the position of the injector / flame holder assembly to be adjusted inside the flame tube 1. The rotation of this assembly is prevented by a tongue 17, integral of the tube 14 and engaging in a slot 18 provided on the cover 6.

Sur l'injecteur 2 est également prévu un préchauffeur électrique de combustible 19, dont le câble d'alimentation 20 traverse le couvercle 6 par l'intermédiaire d'une ouverture 21.An electrical fuel preheater 19 is also provided on the injector 2, the supply cable 20 of which passes through the cover 6 via an opening 21.

L'allumage du brûleur s'effectue au moyen de deux électrodes telles que 22, supportées chacune par un porte-électrode 23 et dont le câble d'alimentation haute-tension 24 traverse le couvercle par l'intermédiaire d'une ouverture 25.The burner is ignited by means of two electrodes such as 22, each supported by an electrode holder 23 and whose high-voltage power cable 24 passes through the cover via an opening 25.

Ainsi qu'on peut le voir plus clairement sur les figures 2 et 3, le couvercle 6 comporte en outre un oeilleton d'inspection 26 et une ouverture 27 pour la mise en place d'une cellule photorésistante 28 permettant de détecter la présence de la flamme.As can be seen more clearly in Figures 2 and 3, the cover 6 further comprises an inspection eyelet 26 and an opening 27 for the establishment of a photoresist cell 28 for detecting the presence of the flame.

Par ailleurs, le couvercle 6 est purvu sur sa paroi interne d'une surface cylindrique 29, disposée axialement par rapport au brûleur et dans laquelle sont ménagées un certain nombre de fentes longitudinales 30 par l'intermédiaire desquelles l'air soufflé par la turbine 5 pénètre à l'intérieur du brûleur. La section de passage de ces fentes 30 est contrôlée au moyen d'un boisseau cylindrique 31, placé à l'intérieur de la surface cylindrique 29 et qui est susceptible de se déplacer axialement sous l'action d'un système à vis 32 et écrou 33. La vis 32 est montée rotative dans une ouverture 34 du couvercle 6 de manière à être accesible de l'extérieur, tandis que l'écrou 33 est rendu solidaire du boisseau 31 par l'intermédiaire d'une languette 35. De plus, cette languette 35 fait saillie à l'extérieur à travers une fente 36 du couvercle, formant ainsi une réglette 37 qui est avantageusement pourvue de graduations permettant de contrôler la position du boisseau.Furthermore, the cover 6 is provided on its internal wall with a cylindrical surface 29, disposed axially with respect to the burner and in which a number of longitudinal slots 30 are formed through which the air blown by the turbine 5 gets inside the burner. The passage section of these slots 30 is controlled by means of a cylindrical plug 31, placed inside the cylindrical surface 29 and which is capable of moving axially under the action of a system of screws 32 and nut 33. The screw 32 is rotatably mounted in an opening 34 of the cover 6 so as to be accessible from the outside, while the nut 33 is made integral with the plug 31 by means of a tongue 35. In addition, this tongue 35 protrudes outside through a slot 36 in the cover, thus forming a strip 37 which is advantageously provided with graduations making it possible to control the position of the plug.

Conformément à la présente invention, la section de passage des différentes fentes 30 n'est pas identique sur toute la périphérie de la surface 29, mais augmente progressivement au fur et à mesure que l'on se trouve plus éloigné du flux d'air engendré par la turbine 5. Autrement dit, les fentes ménagées dans la surface cylindrique 29 sont plus petites du côté de la turbine 5 que du côté opposé, ceci en vue d'égaliser les débits d'air en fonction de la direction générale du flux.According to the present invention, the passage section of the different slots 30 is not identical over the entire periphery of the surface 29, but gradually increases as one is further from the air flow generated by the turbine 5. In other words, the slots formed in the cylindrical surface 29 are smaller on the side of the turbine 5 than on the opposite side, this in order to equalize the air flows as a function of the general direction of the flow.

Dans l'exemple de réalisation particulier décrit ici et ainsi qu'on peut le voir plus clairement sur les figures 4 à 6, six fentes 30, délimitées par des saillies 38, ont été prévues dans la surface cylindrique 29. De plus, ces fentes sont réparties par paires de part et d'autre part de l'axe de symétrie 39 du flux engendré par la turbine. Les deux fentes les plus petites 301 sont situées en face du flux d'air, les deux fentes moyennes 302 sont situées latéralement et les deux fentes les plus grandes 303 sont situées à l'arrière.In the particular embodiment described here and as can be seen more clearly in Figures 4 to 6, six slots 30, delimited by projections 38, have been provided in the cylindrical surface 29. In addition, these slots are distributed in pairs on either side of the axis of symmetry 39 of the flow generated by the turbine. The two smallest slots 301 are located opposite the air flow, the two medium slots 302 are located laterally and the two largest slots 303 are located at the rear.

En réalité et comme cela ressort très clairement de la figure 6, chaque fente est double du fait de la présence au centre d'une dent triangulaire symétrique à double-pente 40. La section de passage de la fente dépend ainsi à la fois de la hauteur totale de la dent et de la hauteur du changement de pente. Grâce à cette disposition, la variation de section de passage, ou dissymétrie, entre les différentes fentes, évolue en fonction de la position axiale du boisseau 31.In reality and as is very clear from FIG. 6, each slot is double due to the presence in the center of a symmetrical triangular tooth with double slope 40. The passage section of the slot thus depends both on the total height of the tooth and the height of the slope change. Thanks to this arrangement, the variation in passage cross-section, or asymmetry, between the different slots, changes as a function of the axial position of the plug 31.

Pour les faibles débits d'air correspondant à une faible puissance du brûleur, les fentes sont presque entièrement masquées. Seul le fond des fentes reste ouvert et ce fond a une forme en pointe permettant d'obtenir une grande précision de réglage. On notera en outre que jusqu'à une hauteur h correspondant au changement de pente de la plus petite dent 40, la variation de la section de passage entre les différentes fentes est pratiquement nulle. En effet, pour les faibles débits, la perte de charge est importante et l'équilibre se rétablit automatiquement au niveau des entrées d'air.For the low air flows corresponding to a low burner power, the slots are almost entirely masked. Only the bottom of the slots remains open and this bottom has a pointed shape allowing high precision of adjustment to be obtained. It will also be noted that up to a height h corresponding to the change in slope of the smallest tooth 40, the variation in the passage section between the different slots is practically zero. Indeed, for low flow rates, the pressure drop is significant and the balance is automatically restored at the air inlets.

Au contraire, au-delà d'un hauteur H correspondant à la hauteur totale de la plus grande dent 40, la variation de section de passage entre les différentes fentes est constante. En effet, pour les grands débits d'air, la perte de charge la plus importante se produit au niveau de l'accroche-flamme 10. Le débit d'air est suffisant pour se répartir de lui-même et l'objectif est alors de donner la section de passage la plus grande possible.On the contrary, beyond a height H corresponding to the total height of the largest tooth 40, the variation in cross section between the different slots is constant. Indeed, for large air flows, the most significant pressure drop occurs at the level of the flame holder 10. The air flow is sufficient to distribute itself and the objective is then to give the largest cross section possible.

Dans la zone médiane comprise entre les hauteurs h et H, la dissymétrie entre les différentes fentes prend toute son importance. Elle croît progressivement et permet ainsi d'obtenir une distribution parfaitement homogène de l'air dans le tube de flamme, quel que soit le débit.In the median zone between the heights h and H, the asymmetry between the different slits takes all its importance. It gradually increases and thus allows a perfectly homogeneous distribution of the air in the flame tube to be obtained, whatever the flow rate.

Claims (4)

1. An air distributing device for a forced air burner, of the type comprising downstream from a turbine (5) which is provided laterally of the burner, a number of longitudinal slots (30) spaced apart over a cylindrical surface (29) which is disposed axially with respect to the burner, and a sleeve (31) in the axial direction to close said slots partially for controlling the air intake, characterized in that the flow area of said slots (30) increases gradually as the distance from the air flow generated by the turbine (5) grows.
2. The device according to claim 1, characterized in that the slots (30) have a tip-shaped profile and are so directed with respect to the sleeve that the tip correspondants to the lowest air flow rate.
3. The device according to claim 1 or 2, characterized in that the profile of slots (30) is so designed that the change in flow area among the various slots varies according to the axial position of the sleeve (31).
4. The device according to claim 3, characterized in that the change is practically zero for low air flow rates, increases for average flow rates and is constant for high flow rates.
EP88401130A 1987-05-20 1988-05-09 Air distributing device for forced draught operated burner Expired - Lifetime EP0295157B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88401130T ATE58785T1 (en) 1987-05-20 1988-05-09 AIR DISTRIBUTION DEVICE FOR A PRESSURE BURNER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8707076A FR2615595B1 (en) 1987-05-20 1987-05-20 AIR DISTRIBUTION DEVICE FOR SUPPLY AIR BURNER
FR8707076 1987-05-20

Publications (2)

Publication Number Publication Date
EP0295157A1 EP0295157A1 (en) 1988-12-14
EP0295157B1 true EP0295157B1 (en) 1990-11-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401130A Expired - Lifetime EP0295157B1 (en) 1987-05-20 1988-05-09 Air distributing device for forced draught operated burner

Country Status (4)

Country Link
EP (1) EP0295157B1 (en)
AT (1) ATE58785T1 (en)
DE (1) DE3861170D1 (en)
FR (1) FR2615595B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1288866B1 (en) * 1996-03-22 1998-09-25 F I M Fonderia Ind Meccanich E PERFECTED BURNER FOR HEAT GENERATOR

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3339191A1 (en) * 1982-10-29 1984-05-03 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Burner fed with a fluid fuel
DE3433201A1 (en) * 1984-09-10 1986-03-13 Hofamat Hoffmann GmbH & Co KG Öl- und Gasbrennerwerk, 7730 Villingen-Schwenningen Forced-draught burner for heating boilers, heating furnaces or the like

Also Published As

Publication number Publication date
DE3861170D1 (en) 1991-01-10
FR2615595A1 (en) 1988-11-25
ATE58785T1 (en) 1990-12-15
EP0295157A1 (en) 1988-12-14
FR2615595B1 (en) 1989-08-18

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