EP0609157B1 - Steam-oven using direct gas heating - Google Patents

Steam-oven using direct gas heating Download PDF

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Publication number
EP0609157B1
EP0609157B1 EP94420011A EP94420011A EP0609157B1 EP 0609157 B1 EP0609157 B1 EP 0609157B1 EP 94420011 A EP94420011 A EP 94420011A EP 94420011 A EP94420011 A EP 94420011A EP 0609157 B1 EP0609157 B1 EP 0609157B1
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EP
European Patent Office
Prior art keywords
burner
gas
oven
enclosure
air
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EP94420011A
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German (de)
French (fr)
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EP0609157A1 (en
Inventor
André Rigaud
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Societe Cooperative de Production Bourgeois SCOP
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Societe Cooperative de Production Bourgeois SCOP
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/327—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation with air moisturising

Definitions

  • the present invention relates to direct gas heating steam ovens, in particular for cooking food products.
  • Such a known convection and direct gas heating oven essentially comprises an enclosure closed by a peripheral wall and a door, the interior space of the enclosure comprising a first part for receiving the food products to be cooked and a second part containing a at least one gas burner connected to a system for supplying a mixture of gas and combustion air under pressure and on the other hand at least one turbine for circulating heated air in the two parts of the enclosure.
  • the gas burner is placed upstream of the turbine in the air circulation current caused by the turbine, in an intermediate enclosure part situated between a first partition wall the separating it from the part containing the food to be cooked, and a second partition wall separating it from the part occupied by the turbine.
  • the burner is then placed in the upper position of the enclosure, and oriented to direct the flame downward, favoring the flow of water possibly formed by condensation in the burner.
  • This solution leads to a significant increase in the size of the functional organs of the oven, thereby reducing the volume of the useful part intended to receive the food to be cooked.
  • the cleaning of the various functional organs requires the disassembly of two successive walls, and this disassembly is particularly delicate owing to the presence of various detection probes associated with the burner to control or command the gas flame.
  • the problem proposed by the present invention is to design a new structure of a steam oven with direct gas heating, in which all the functional members such as the turbine and the burner are included in a single enclosure part, to occupy a volume reduced, a single wall that can separate this enclosure part with the useful part intended to receive the food to be cooked, and in which means are provided to prevent the accumulation of condensation water in the burner and to promote stabilization and maintaining the gas flame.
  • Another object of the invention is to considerably facilitate the cleaning of the functional elements of the oven, and to reduce the risks of degradation of these functional elements during cleaning.
  • the invention also makes it possible to better distribute the flame in the burners, improving combustion and the distribution of heat.
  • the convection oven and direct gas heating comprises an enclosure surrounded by a peripheral wall provided with a door, the enclosure being divided into two parts by an intermediate wall. single with air inlet and air outlet orifices, the first enclosure part being intended to receive the food products to be cooked, the second enclosure part containing on the one hand at least one connected gas burner a gas and combustion air supply system under pressure and on the other hand at least one turbine for circulating heated air in the two parts of the enclosure.
  • the gas burner is placed downstream of the turbine in the air circulation current caused by the turbine.
  • a steam generator is associated to introduce steam into the enclosure.
  • the outlet openings of the gas burner are oriented in such a way that any water condensates formed in the burner can flow by gravity out of the burner through said outlet openings, and in such a way that the flow of burning gas forming the flame flows in a direction forming with the direction of the flow of air flow from the turbine near the burner an angle of orientation less than a limit value maximum causing the drop of the flame.
  • This orientation angle is advantageously less than approximately 90 °.
  • the oven comprises a single turbine in a substantially central position near the rear wall of the oven, and a gas burner in the form of a ramp placed above the turbine in substantially horizontal orientation, the outlet orifices of the burner being oriented forward towards the intermediate wall.
  • the furnace comprises two turbines arranged one above the other near the rear wall of the furnace, and two ramp-shaped gas burners placed respectively above one and on the other, the turbines in substantially horizontal orientation, the burner outlet orifices being oriented towards the front in the direction of the intermediate wall.
  • the oven according to the invention comprises an enclosure 1 closed by a peripheral wall 2 and a front door 3.
  • the interior space of the enclosure 1 is divided, by an intermediate wall 4 with inlet openings air 5 and air outlet ports 6, in a first part 7 receiving the food products to be cooked and in a second part 8 containing the functional elements of the oven.
  • the second part 8 contains on the one hand a gas burner 9 connected to a system 10 for supplying a mixture of gas and combustion air under pressure, and on the other hand a turbine 11 for circulating heated air in the two parts of the enclosure.
  • the turbine 11 is driven in rotation by an electric motor 12.
  • a steam generator 13 is associated to introduce steam into the enclosure 1, as shown diagrammatically in the figures.
  • the turbine 11 is rotatable along an anteroposterior axis 14 perpendicular to the posterior wall 15 of the furnace.
  • the turbine 11 is of the type aspirating the air axially, as shown by the arrows 16, and ejecting the air radially as shown by the arrows 17.
  • the burner 9 is, in the embodiment shown, placed in the upper part of the second enclosure part 8, above the turbine 11. It is thus located downstream of the turbine 11 in the circulation current of air caused by the turbine.
  • the burner 9 is in the general shape of a tube with a substantially horizontal axis and parallel to the rear wall 15 of the furnace. It comprises gas outlet orifices oriented in such a way that the flow of burning gas forming the flame 18 flows forward towards the intermediate wall 4, that is to say perpendicular to the direction of flow of air blown by the turbine 11 in the second enclosure part 8.
  • the orientation of the burner 9 can be different, and can be chosen within a variation range such that the direction I of the gas flow forming the flame 18 forms with the direction II of air flow in the vicinity of the burner 9 an angle orientation less than a maximum limit value causing the flame 18 to drop off under the action of the air flow.
  • This orientation angle is advantageously less than approximately 90 °.
  • the burner 9 is oriented in such a way that any water condensates formed in the burner can flow by gravity out of the burner through its outlet orifices.
  • the flame 18 is directed towards the front, against the intermediate wall 4, which can then advantageously be covered with a thermal protection plate 19.
  • the flame 18 can be directed rearward towards the rear wall 15. It is necessary to avoid directing the flame 18 upward, because the burner outlet orifices then no longer allow the flow of water. by gravity out of the burner.
  • the burner can also be placed in the lower part of the second enclosure part 8, below the turbine 11.
  • the flame can then be directed either towards the front against the intermediate wall 4, or towards the rear against the rear wall 15, either even against the bottom 20 of the enclosure, or in any intermediate orientation downward between the forward orientation and the rearward orientation.
  • the structure itself of the burner 9 is advantageously tubular, and can be similar to that described in document EP-A-0 409 685, with a series of slots distributed over the length of the tube, substantially perpendicular to the axis of the tube. , and open on a little less than the half-circumference of the tube.
  • Such a tube is advantageously associated with deflector plates parallel to the axis of the tube and bordering the ends of the outlet slots.
  • Such a tube is connected to an inlet pipe for a mixture of gas and air.
  • the pipe inlet orifice is advantageously located in the central position of the burner, equidistant from the two ends. This improves the distribution of the gas, and a more regular flame is produced along the burner.
  • a discharge outlet 21 for the burnt gases is provided in the upper position of the second enclosure part 8.
  • the intermediate wall 4 comprises air inlet openings 5 arranged facing the turbine 11, to allow filtering and axial introduction of air into the turbine as shown by the arrows 16
  • the intermediate wall 4 also comprises air outlet openings 6 formed in the vicinity of its connection to the peripheral enclosure wall, preferably in the vicinity of the intermediate wall connection 4 with the side walls of the furnace.
  • the intermediate wall 4 is advantageously removable, its exit from the enclosure 1 being effected by the door 3. Its removal allows the cleaning of the functional elements contained in the second enclosure part 8. All the functional elements of the oven are contained in the same enclosure part 8. Their cleaning only requires the removal of the intermediate wall 4. This considerably facilitates the cleaning operations. In particular, the removal of the intermediate wall 4, which is located entirely at the front of all the functional organs, does not risk damaging the functional organs and in particular the detection probes which are associated with the burner 9 so known, for detecting and controlling the flame 18.
  • the oven comprises a single turbine 11 in a substantially central position near the rear wall 15 of the oven, and a gas burner 9 in the form of a tube placed above the turbine 11 in substantially horizontal orientation, the flame being oriented towards the front towards the intermediate wall 4.
  • the oven comprises two turbines 111 and 211, arranged one above the other along the rear wall of the oven, and two gas burners 109 and 209 in the form of a tube placed respectively above one and the other of the turbines in substantially horizontal orientation, the outlet orifices of the burners being oriented forward towards the intermediate wall.

Description

La présente invention concerne les fours à vapeur à chauffage direct au gaz, notamment pour la cuisson de produits alimentaires.The present invention relates to direct gas heating steam ovens, in particular for cooking food products.

On connaît déjà des fours fonctionnant à la fois à la vapeur et au gaz, par exemple tels que décrits dans les documents EP-A-0 277 888 et EP-A-0 409 685.Ovens operating both with steam and with gas are already known, for example as described in documents EP-A-0 277 888 and EP-A-0 409 685.

Un tel four connu à convection et chauffage direct au gaz comprend essentiellement une enceinte fermée par une paroi périphérique et une porte, l'espace intérieur de l'enceinte comprenant une première partie réceptrice des produits alimentaires à cuire et une seconde partie renfermant d'une part au moins un brûleur à gaz relié à un système d'alimentation d'un mélange de gaz et d'air de combustion sous pression et d'autre part au moins une turbine de mise en circulation d'air chauffé dans les deux parties de l'enceinte.Such a known convection and direct gas heating oven essentially comprises an enclosure closed by a peripheral wall and a door, the interior space of the enclosure comprising a first part for receiving the food products to be cooked and a second part containing a at least one gas burner connected to a system for supplying a mixture of gas and combustion air under pressure and on the other hand at least one turbine for circulating heated air in the two parts of the enclosure.

Pour éviter que de l'eau se forme et stagne dans le brûleur à gaz, par suite de condensation de la vapeur, diverses solutions ont été proposées. Ainsi, dans le document EP-A-0 277 888, le brûleur à gaz est placé en aval de la turbine dans le courant de circulation d'air provoqué par la turbine, et il est placé en partie inférieure de l'enceinte, les orifices de sortie de flamme étant dirigés vers le haut. Des moyens de chauffage annexes maintiennent le brûleur en permanence à une température supérieure à la température de condensation de vapeur d'eau, évitant ainsi la formation d'eau liquide dans ou sur le brûleur. Il apparaît toutefois qu'une telle solution ne donne pas des satisfactions suffisantes, et conduit notamment à des perturbations sensibles de la flamme.Various solutions have been proposed to prevent water from forming and stagnating in the gas burner due to condensation of the vapor. Thus, in document EP-A-0 277 888, the gas burner is placed downstream of the turbine in the air circulation current caused by the turbine, and it is placed in the lower part of the enclosure, the flame outlet ports being directed upward. Additional heating means permanently maintain the burner at a temperature higher than the water vapor condensation temperature, thus preventing the formation of liquid water in or on the burner. However, it appears that such a solution does not give sufficient satisfaction, and leads in particular to significant disturbances of the flame.

Dans le document EP-A-0 409 685, le brûleur à gaz est placé en amont de la turbine dans le courant de circulation d'air provoqué par la turbine, dans une partie intermédiaire d'enceinte située entre une première paroi de séparation la séparant de la partie contenant les aliments à cuire, et une seconde paroi de séparation la séparant de la partie occupée par la turbine. Le brûleur est alors placé en position supérieure de l'enceinte, et orienté pour diriger la flamme vers le bas, favorisant l'écoulement de l'eau formée éventuellement par condensation dans le brûleur. Cette solution conduit à augmenter sensiblement l'encombrement des organes fonctionnels du four, diminuant ainsi le volume de la partie utile destinée à recevoir les aliments à cuire. En outre, le nettoyage des différents organes fonctionnels nécessite le démontage de deux parois successives, et ce démontage est particulièrement délicat par suite de la présence de diverses sondes de détection associées au brûleur pour contrôler ou commander la flamme de gaz.In document EP-A-0 409 685, the gas burner is placed upstream of the turbine in the air circulation current caused by the turbine, in an intermediate enclosure part situated between a first partition wall the separating it from the part containing the food to be cooked, and a second partition wall separating it from the part occupied by the turbine. The burner is then placed in the upper position of the enclosure, and oriented to direct the flame downward, favoring the flow of water possibly formed by condensation in the burner. This solution leads to a significant increase in the size of the functional organs of the oven, thereby reducing the volume of the useful part intended to receive the food to be cooked. In furthermore, the cleaning of the various functional organs requires the disassembly of two successive walls, and this disassembly is particularly delicate owing to the presence of various detection probes associated with the burner to control or command the gas flame.

Le problème proposé par la présente invention est de concevoir une nouvelle structure de four à vapeur à chauffage direct au gaz, dans laquelle tous les organes fonctionnels tels que la turbine et le brûleur sont inclus dans une seule partie d'enceinte, pour occuper un volume réduit, une paroi unique pouvant séparer cette partie d'enceinte avec la partie utile destinée à recevoir les aliments à cuire, et dans laquelle des moyens sont prévus pour empêcher l'accumulation d'eau de condensation dans le brûleur et pour favoriser la stabilisation et le maintien de la flamme de gaz.The problem proposed by the present invention is to design a new structure of a steam oven with direct gas heating, in which all the functional members such as the turbine and the burner are included in a single enclosure part, to occupy a volume reduced, a single wall that can separate this enclosure part with the useful part intended to receive the food to be cooked, and in which means are provided to prevent the accumulation of condensation water in the burner and to promote stabilization and maintaining the gas flame.

Un autre objet de l'invention est de faciliter considérablement le nettoyage des éléments fonctionnels du four, et de diminuer les risques de dégradation de ces éléments fonctionnels lors du nettoyage.Another object of the invention is to considerably facilitate the cleaning of the functional elements of the oven, and to reduce the risks of degradation of these functional elements during cleaning.

L'invention permet en outre de mieux répartir la flamme dans les brûleurs, améliorant la combustion et la répartition de chaleur.The invention also makes it possible to better distribute the flame in the burners, improving combustion and the distribution of heat.

Pour atteindre ces objets ainsi que d'autres, le four à convection et chauffage direct au gaz selon l'invention comprend une enceinte entourée d'une paroi périphérique munie d'une porte, l'enceinte étant divisée en deux parties par une paroi intermédiaire unique à orifices d'entrée d'air et de sortie d'air, la première partie d'enceinte étant destinée à recevoir les produits alimentaires à cuire, la seconde partie d'enceinte renfermant d'une part au moins un brûleur à gaz relié à un système d'alimentation de gaz et d'air de combustion sous pression et d'autre part au moins une turbine de mise en circulation d'air chauffé dans les deux parties de l'enceinte. Le brûleur à gaz est placé en aval de la turbine dans le courant de circulation d'air provoqué par la turbine. Un générateur de vapeur d'eau est associé pour introduire de la vapeur dans l'enceinte. Selon l'invention, les orifices de sortie du brûleur à gaz sont orientés de telle façon que les éventuels condensats d'eau formés dans le brûleur puissent s'écouler par gravité hors du brûleur par lesdits orifices de sortie, et de telle façon que le flux de gaz en combustion formant la flamme s'écoule dans une direction formant avec la direction du flux d'écoulement d'air issu de la turbine au voisinage du brûleur un angle d'orientation inférieur à une valeur limite maximale provoquant le décrochement de la flamme. Cet angle d'orientation est avantageusement inférieur à 90° environ.To achieve these and other objects, the convection oven and direct gas heating according to the invention comprises an enclosure surrounded by a peripheral wall provided with a door, the enclosure being divided into two parts by an intermediate wall. single with air inlet and air outlet orifices, the first enclosure part being intended to receive the food products to be cooked, the second enclosure part containing on the one hand at least one connected gas burner a gas and combustion air supply system under pressure and on the other hand at least one turbine for circulating heated air in the two parts of the enclosure. The gas burner is placed downstream of the turbine in the air circulation current caused by the turbine. A steam generator is associated to introduce steam into the enclosure. According to the invention, the outlet openings of the gas burner are oriented in such a way that any water condensates formed in the burner can flow by gravity out of the burner through said outlet openings, and in such a way that the flow of burning gas forming the flame flows in a direction forming with the direction of the flow of air flow from the turbine near the burner an angle of orientation less than a limit value maximum causing the drop of the flame. This orientation angle is advantageously less than approximately 90 °.

Selon un mode de réalisation, le four comprend une seule turbine en position sensiblement centrale près de la paroi postérieure de four, et un brûleur à gaz en forme de rampe placé au-dessus de la turbine en orientation sensiblement horizontale, les orifices de sortie du brûleur étant orientés vers l'avant en direction de la paroi intermédiaire.According to one embodiment, the oven comprises a single turbine in a substantially central position near the rear wall of the oven, and a gas burner in the form of a ramp placed above the turbine in substantially horizontal orientation, the outlet orifices of the burner being oriented forward towards the intermediate wall.

Selon un autre mode de réalisation, le four comprend deux turbines disposées l'une au-dessus de l'autre près de la paroi postérieure de four, et deux brûleurs à gaz en forme de rampe placés respectivement au-dessus de l'une et de l'autre des turbines en orientation sensiblement horizontale, les orifices de sortie des brûleurs étant orientés vers l'avant en direction de la paroi intermédiaire.According to another embodiment, the furnace comprises two turbines arranged one above the other near the rear wall of the furnace, and two ramp-shaped gas burners placed respectively above one and on the other, the turbines in substantially horizontal orientation, the burner outlet orifices being oriented towards the front in the direction of the intermediate wall.

D'autres objets, caractéristiques et avantages de la présente invention ressortiront de la description suivante de modes de réalisation particuliers, faite en relation avec les figures jointes, parmi lesquelles :

  • la figure 1 représente une vue schématique de côté en coupe longitudinale d'un four selon la présente invention ;
  • la figure 2 est une vue de face du four de la figure 1, porte ouverte, montrant la paroi de séparation ;
  • la figure 3 est une vue de face du même four de la figure 1, porte ouverte et paroi de séparation enlevée ;
  • la figure 4 est une vue de dessus en coupe du four de la figure 1 ; et
  • la figure 5 est une vue de face d'un four selon un second mode de réalisation de l'invention, porte ouverte et paroi intermédiaire enlevée.
Other objects, characteristics and advantages of the present invention will emerge from the following description of particular embodiments, given in relation to the attached figures, among which:
  • Figure 1 shows a schematic side view in longitudinal section of an oven according to the present invention;
  • Figure 2 is a front view of the oven of Figure 1, door open, showing the partition wall;
  • Figure 3 is a front view of the same oven of Figure 1, door open and partition wall removed;
  • Figure 4 is a top sectional view of the oven of Figure 1; and
  • Figure 5 is a front view of an oven according to a second embodiment of the invention, open door and removed intermediate wall.

Comme le représentent les figures, le four selon l'invention comprend une enceinte 1 fermée par une paroi périphérique 2 et une porte antérieure 3. L'espace intérieur de l'enceinte 1 est divisé, par une paroi intermédiaire 4 à orifices d'entrée d'air 5 et orifices de sortie d'air 6, en une première partie 7 réceptrice des produits alimentaires à cuire et en une seconde partie 8 contenant les éléments fonctionnels du four. La seconde partie 8 renferme d'une part un brûleur à gaz 9 relié à un système 10 d'alimentation d'un mélange de gaz et d'air de combustion sous pression, et d'autre part une turbine 11 de mise en circulation d'air chauffé dans les deux parties de l'enceinte. La turbine 11 est entraînée en rotation par un moteur électrique 12. Un générateur de vapeur d'eau 13 est associé pour introduire de la vapeur d'eau dans l'enceinte 1, comme représenté schématiquement sur les figures. La turbine 11 est rotative selon un axe antéro-postérieur 14 perpendiculaire à la paroi postérieure 15 du four. La turbine 11 est du type aspirant l'air axialement, comme le représentent les flèches 16, et éjectant l'air radialement comme le représentent les flèches 17.As shown in the figures, the oven according to the invention comprises an enclosure 1 closed by a peripheral wall 2 and a front door 3. The interior space of the enclosure 1 is divided, by an intermediate wall 4 with inlet openings air 5 and air outlet ports 6, in a first part 7 receiving the food products to be cooked and in a second part 8 containing the functional elements of the oven. The second part 8 contains on the one hand a gas burner 9 connected to a system 10 for supplying a mixture of gas and combustion air under pressure, and on the other hand a turbine 11 for circulating heated air in the two parts of the enclosure. The turbine 11 is driven in rotation by an electric motor 12. A steam generator 13 is associated to introduce steam into the enclosure 1, as shown diagrammatically in the figures. The turbine 11 is rotatable along an anteroposterior axis 14 perpendicular to the posterior wall 15 of the furnace. The turbine 11 is of the type aspirating the air axially, as shown by the arrows 16, and ejecting the air radially as shown by the arrows 17.

Le brûleur 9 est, dans le mode de réalisation représenté, placé en partie supérieure de la seconde partie 8 d'enceinte, au-dessus de la turbine 11. Il se trouve ainsi en aval de la turbine 11 dans le courant de circulation d'air provoqué par la turbine. Le brûleur 9 est en forme générale de tube d'axe sensiblement horizontal et parallèle à la paroi postérieure 15 du four. Il comprend des orifices de sortie de gaz orientés de telle façon que le flux de gaz en combustion formant la flamme 18 s'écoule vers l'avant en direction de la paroi intermédiaire 4, c'est-à-dire perpendiculairement au sens d'écoulement de l'air pulsé par la turbine 11 dans la seconde partie 8 d'enceinte. L'orientation du brûleur 9 peut être différente, et peut être choisie dans une plage de variation telle que la direction I du flux de gaz formant la flamme 18 forme avec la direction II d'écoulement d'air au voisinage du brûleur 9 un angle d'orientation inférieur à une valeur limite maximale provoquant le décrochement de la flamme 18 sous l'action du flux d'air. Cet angle d'orientation est avantageusement inférieur à 90° environ.The burner 9 is, in the embodiment shown, placed in the upper part of the second enclosure part 8, above the turbine 11. It is thus located downstream of the turbine 11 in the circulation current of air caused by the turbine. The burner 9 is in the general shape of a tube with a substantially horizontal axis and parallel to the rear wall 15 of the furnace. It comprises gas outlet orifices oriented in such a way that the flow of burning gas forming the flame 18 flows forward towards the intermediate wall 4, that is to say perpendicular to the direction of flow of air blown by the turbine 11 in the second enclosure part 8. The orientation of the burner 9 can be different, and can be chosen within a variation range such that the direction I of the gas flow forming the flame 18 forms with the direction II of air flow in the vicinity of the burner 9 an angle orientation less than a maximum limit value causing the flame 18 to drop off under the action of the air flow. This orientation angle is advantageously less than approximately 90 °.

En outre, le brûleur 9 est orienté de telle manière que les éventuels condensats d'eau formés dans le brûleur puissent s'écouler par gravité hors du brûleur par ses orifices de sortie.In addition, the burner 9 is oriented in such a way that any water condensates formed in the burner can flow by gravity out of the burner through its outlet orifices.

On peut donc imaginer, selon l'invention, divers positionnements du brûleur. Dans le mode de réalisation représenté, la flamme 18 est dirigée vers l'avant, contre la paroi intermédiaire 4, qui peut alors avantageusement être recouverte d'une plaque de protection thermique 19.One can therefore imagine, according to the invention, various positions of the burner. In the embodiment shown, the flame 18 is directed towards the front, against the intermediate wall 4, which can then advantageously be covered with a thermal protection plate 19.

En alternative, la flamme 18 peut être dirigée vers l'arrière en direction de la paroi postérieure 15. Il faut éviter de diriger la flamme 18 vers le haut, car les orifices de sortie du brûleur ne permettent alors plus l'écoulement d'eau par gravité hors du brûleur.Alternatively, the flame 18 can be directed rearward towards the rear wall 15. It is necessary to avoid directing the flame 18 upward, because the burner outlet orifices then no longer allow the flow of water. by gravity out of the burner.

En alternative, on peut également disposer le brûleur dans la partie inférieure de seconde partie 8 d'enceinte, au-dessous de la turbine 11. La flamme peut alors être dirigée soit vers l'avant contre la paroi intermédiaire 4, soit vers l'arrière contre la paroi postérieure 15, soit même contre le fond 20 de l'enceinte, ou en toute orientation intermédiaire vers le bas entre l'orientation vers l'avant et l'orientation vers l'arrière.As an alternative, the burner can also be placed in the lower part of the second enclosure part 8, below the turbine 11. The flame can then be directed either towards the front against the intermediate wall 4, or towards the rear against the rear wall 15, either even against the bottom 20 of the enclosure, or in any intermediate orientation downward between the forward orientation and the rearward orientation.

D'autres modes de réalisation peuvent être imaginés, avec un ou plusieurs brûleurs sur les côtés de la turbine, le tube formant le brûleur pouvant être orienté verticalement. L'écoulement d'eau hors du brûleur peut alors se faire par l'orifice de sortie inférieur du brûleur.Other embodiments can be imagined, with one or more burners on the sides of the turbine, the tube forming the burner being able to be oriented vertically. The flow of water out of the burner can then take place through the lower outlet of the burner.

La structure elle-même du brûleur 9 est avantageusement tubulaire, et peut être similaire à celle décrite dans le document EP-A-0 409 685, avec une série de fentes réparties sur la longueur du tube, sensiblement perpendiculaires à l'axe du tube, et ouvertes sur un peu moins de la demi-circonférence du tube. Un tel tube est avantageusement associé à des plaques déflectrices parallèles à l'axe du tube et bordant les extrémités des fentes de sortie.The structure itself of the burner 9 is advantageously tubular, and can be similar to that described in document EP-A-0 409 685, with a series of slots distributed over the length of the tube, substantially perpendicular to the axis of the tube. , and open on a little less than the half-circumference of the tube. Such a tube is advantageously associated with deflector plates parallel to the axis of the tube and bordering the ends of the outlet slots.

Un tel tube est raccordé à une canalisation d'arrivée de mélange de gaz et d'air. Selon l'invention, l'orifice d'arrivée de canalisation est avantageusement situé en position centrale du brûleur, à égale distance des deux extrémités. On améliore ainsi la répartition du gaz, et on réalise une flamme plus régulière le long du brûleur.Such a tube is connected to an inlet pipe for a mixture of gas and air. According to the invention, the pipe inlet orifice is advantageously located in the central position of the burner, equidistant from the two ends. This improves the distribution of the gas, and a more regular flame is produced along the burner.

De façon connue, une oura 21 d'évacuation des gaz brûlés est prévue en position supérieure de la seconde partie 8 d'enceinte.In known manner, a discharge outlet 21 for the burnt gases is provided in the upper position of the second enclosure part 8.

Dans le mode de réalisation représenté, la paroi intermédiaire 4 comprend des ouvertures d'entrée d'air 5 disposées au regard de la turbine 11, pour permettre le filtrage et l'introduction axiale d'air dans la turbine comme le représentent les flèches 16. La paroi intermédiaire 4 comprend en outre des ouvertures de sortie d'air 6 ménagées au voisinage de son raccordement à la paroi périphérique d'enceinte, de préférence au voisinage du raccordement de paroi intermédiaire 4 avec les parois latérales du four.In the embodiment shown, the intermediate wall 4 comprises air inlet openings 5 arranged facing the turbine 11, to allow filtering and axial introduction of air into the turbine as shown by the arrows 16 The intermediate wall 4 also comprises air outlet openings 6 formed in the vicinity of its connection to the peripheral enclosure wall, preferably in the vicinity of the intermediate wall connection 4 with the side walls of the furnace.

La paroi intermédiaire 4 est avantageusement amovible, sa sortie hors de l'enceinte 1 s'effectuant par la porte 3. Son enlèvement permet le nettoyage des éléments fonctionnels contenus dans la seconde partie 8 d'enceinte. Tous les éléments fonctionnels du four sont contenus dans la même partie 8 d'enceinte. Leur nettoyage nécessite seulement l'enlèvement de la paroi intermédiaire 4. Cela facilite considérablement les opérations de nettoyage. En particulier, l'enlèvement de la paroi intermédiaire 4, qui se trouve entièrement à l'avant de tous les organes fonctionnels, ne risque pas d'endommager les organes fonctionnels et en particulier les sondes de détection qui sont associées au brûleur 9 de façon connue, pour la détection et le pilotage de la flamme 18.The intermediate wall 4 is advantageously removable, its exit from the enclosure 1 being effected by the door 3. Its removal allows the cleaning of the functional elements contained in the second enclosure part 8. All the functional elements of the oven are contained in the same enclosure part 8. Their cleaning only requires the removal of the intermediate wall 4. This considerably facilitates the cleaning operations. In particular, the removal of the intermediate wall 4, which is located entirely at the front of all the functional organs, does not risk damaging the functional organs and in particular the detection probes which are associated with the burner 9 so known, for detecting and controlling the flame 18.

Dans le mode de réalisation des figures 1 à 4, le four comprend une seule turbine 11 en position sensiblement centrale près de la paroi postérieure 15 de four, et un brûleur à gaz 9 en forme de tube placé au-dessus de la turbine 11 en orientation sensiblement horizontale, la flamme étant orientée vers l'avant en direction de la paroi intermédiaire 4.In the embodiment of FIGS. 1 to 4, the oven comprises a single turbine 11 in a substantially central position near the rear wall 15 of the oven, and a gas burner 9 in the form of a tube placed above the turbine 11 in substantially horizontal orientation, the flame being oriented towards the front towards the intermediate wall 4.

Dans le mode de réalisation de la figure 5, représenté four ouvert et paroi intermédiaire 4 enlevée, le four comprend deux turbines 111 et 211, disposées l'une au-dessus de l'autre le long de la paroi postérieure de four, et deux brûleurs à gaz 109 et 209 en forme de tube placés respectivement au-dessus de l'une et l'autre des turbines en orientation sensiblement horizontale, les orifices de sortie des brûleurs étant orientés vers l'avant en direction de la paroi intermédiaire.In the embodiment of Figure 5, shown open oven and intermediate wall 4 removed, the oven comprises two turbines 111 and 211, arranged one above the other along the rear wall of the oven, and two gas burners 109 and 209 in the form of a tube placed respectively above one and the other of the turbines in substantially horizontal orientation, the outlet orifices of the burners being oriented forward towards the intermediate wall.

La présente invention n'est pas limitée aux modes de réalisation qui ont été explicitement décrits, mais elle en inclut les diverses variantes et généralisations contenues dans le domaine des revendications ci-après.The present invention is not limited to the embodiments which have been explicitly described, but it includes the various variants and generalizations thereof contained in the field of claims below.

Claims (8)

  1. Gas-fired direct heating and convection oven, in particular for cooking foods, comprising an enclosure (1) closed by a peripheral wall (2) and a door (3), the interior space of the enclosure (1) being divided by an intermediate wall (4) having air entry and exit orifices (5, 6) in a first part (7) receiving foods to be cooked and a second part (8) containing on one hand at least one gas-fired burner (9) connected to a system (10) for supplying a mixture of gas and combustion-supporting air under pressure and on the other hand at least one fan (11) for circulating heated air in both parts (7, 8) of the enclosure, said gas-fired burner (9) being on the downstream side of the fan (11) in the circulating flow of air driven by the fan, a steam generator (13) being associated for introducing steam into the enclosure (1), characterized in that the outlet orifices of the gas-fire burner (9) are oriented so that any condensed water produced in the burner (9) can flow out of the burner through said outlet orifices by gravity and so that the flow of burning gas forming the flame (18) flows in a direction (I) at an orientation angle to the direction of flow of the flow of air (II) from the fan (11) near the burner (9) which is less than a maximal limit value causing separation of the flame (18).
  2. Oven according to claim 1 characterized in that the orientation angle is less than 90°.
  3. Oven according to claim 1 or claim 2 characterized in that:
    - the fan (11) rotates about an anterior-posterior axis (14),
    - the intermediate wall (4) includes air entry openings (5) facing the fan for axial entry of air and air exit openings (6) near where it merges with the peripheral wall (2) of the enclosure (1).
  4. Oven according to claim 3 characterized in that it comprises a single fan (11) in a substantially central position near the posterior oven wall (15) and a tubular gas-fired burner (9) disposed above the fan (11) with a substantially horizontal orientation, the outlet orifices of the burner (9) being oriented towards the front and towards the intermediate wall (4).
  5. Oven according to claim 3 characterized in that it comprises two fans (111, 211) disposed one above the other near the posterior oven wall (15) and two tubular gas-fired burners (109, 209) disposed above respective fans with a substantially horizontal orientation, the outlet orifices of the burners being oriented towards the front and towards the intermediate wall (4).
  6. Oven according to claim 4 or claim 5 characterized in that the air exit openings (6) are near where the intermediate wall (4) merges with the side walls of the oven.
  7. Oven according to any one of claims 1 to 6 characterized in that the intermediate wall (4) is removable to enable functional components contained in the second part (8) of the enclosure to be cleaned.
  8. Oven according to any one of claims 1 to 7 characterized in that the intermediate wall (4) is covered with thermal protection plates (19) in line with the burner(s) (9).
EP94420011A 1993-01-29 1994-01-12 Steam-oven using direct gas heating Expired - Lifetime EP0609157B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9301123 1993-01-29
FR9301123A FR2701090B1 (en) 1993-01-29 1993-01-29 Steam oven with direct gas heating.

Publications (2)

Publication Number Publication Date
EP0609157A1 EP0609157A1 (en) 1994-08-03
EP0609157B1 true EP0609157B1 (en) 1997-10-22

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US (1) US5460158A (en)
EP (1) EP0609157B1 (en)
CA (1) CA2114196C (en)
DE (1) DE69406317T2 (en)
ES (1) ES2109641T3 (en)
FR (1) FR2701090B1 (en)

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GB2286455B (en) * 1994-02-10 1998-01-14 Stoves Plc Improvements in and relating to gaseous fuel burner assemblies and to appliances incorporating such burner assemblies
ES2117497B1 (en) * 1994-05-19 1999-02-16 Salva Ind IMPROVEMENTS INTRODUCED IN BAKERY AND CYCLOTHERMIC PASTRY OVENS.
US5515773A (en) * 1995-02-16 1996-05-14 The Rival Company Steam oven
KR100402585B1 (en) * 2000-12-30 2003-10-22 주식회사 엘지이아이 Internal air circulation device for microwave oven
CN2669018Y (en) * 2003-09-30 2005-01-05 梁锡球 Water supporting combustion energy-saving device suitable for gas utensil or gas power machine
US8138452B2 (en) * 2008-07-14 2012-03-20 Whirlpool Corporation Convection oven
US8258435B2 (en) * 2008-12-16 2012-09-04 Whirlpool Corporation Dual fan convection oven
US9683747B2 (en) * 2011-12-16 2017-06-20 Alto-Shaam, Inc. Combination oven with catalytic converter
KR101564504B1 (en) * 2014-04-03 2015-10-29 엘지전자 주식회사 Cooking appliance, burner and burner assembly
US10907836B2 (en) * 2015-11-11 2021-02-02 Laxminarasimhan Vasan Convection based cooking apparatus with adjustable inlet shutter
DE102016215650A1 (en) * 2016-08-19 2018-02-22 BSH Hausgeräte GmbH Haushaltsgargerät

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JPS5685641A (en) * 1979-12-14 1981-07-11 Matsushita Electric Ind Co Ltd Forced heat circulation-type gas oven
JPS5851168B2 (en) * 1979-12-18 1983-11-15 株式会社東芝 High frequency heating device
FR2609532B1 (en) * 1987-01-08 1990-12-14 Bourgeois Sc GAS STEAM OVEN
US4813398A (en) * 1988-05-09 1989-03-21 Hobart Corporation Convection oven
GB8815381D0 (en) * 1988-06-28 1988-08-03 New World Domestic Appliances Cooking ovens
FR2650061B1 (en) * 1989-07-19 1991-11-15 Gaz De France IMPROVED OVEN OPERATING ON STEAM AND / OR GAS
DE4116500A1 (en) * 1991-05-21 1992-11-26 Binder Wtb Labortech Gmbh LABORATORY HOT CUPBOARD

Also Published As

Publication number Publication date
CA2114196A1 (en) 1994-07-30
EP0609157A1 (en) 1994-08-03
FR2701090B1 (en) 1995-04-07
ES2109641T3 (en) 1998-01-16
DE69406317T2 (en) 1998-04-30
US5460158A (en) 1995-10-24
DE69406317D1 (en) 1997-11-27
FR2701090A1 (en) 1994-08-05
CA2114196C (en) 1996-11-12

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