EP1111309B1 - Gas oven - Google Patents

Gas oven Download PDF

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Publication number
EP1111309B1
EP1111309B1 EP20000403590 EP00403590A EP1111309B1 EP 1111309 B1 EP1111309 B1 EP 1111309B1 EP 20000403590 EP20000403590 EP 20000403590 EP 00403590 A EP00403590 A EP 00403590A EP 1111309 B1 EP1111309 B1 EP 1111309B1
Authority
EP
European Patent Office
Prior art keywords
muffle
perforated area
bottom wall
holes
intermediate cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20000403590
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German (de)
French (fr)
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EP1111309A1 (en
Inventor
Pascal Thomson-CSF Prop. Intellectuelle Bailly
Olivier Thomson-CSF Prop. Intellectuelle Verges
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brandt Industries SAS
Original Assignee
Brandt Cooking SAC
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Filing date
Publication date
Application filed by Brandt Cooking SAC filed Critical Brandt Cooking SAC
Publication of EP1111309A1 publication Critical patent/EP1111309A1/en
Application granted granted Critical
Publication of EP1111309B1 publication Critical patent/EP1111309B1/en
Anticipated expiration legal-status Critical
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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
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/08—Arrangement or mounting of burners
    • F24C3/085—Arrangement or mounting of burners on ranges
    • F24C3/087—Arrangement or mounting of burners on ranges in baking ovens

Definitions

  • the invention relates to the field of gas cooking ovens which, unless otherwise stated, will be called gas ovens throughout the text.
  • the invention relates in particular to the field of gas ovens including the muffle has walls having a coating which can be damaged by excessive temperatures.
  • the gas ovens of the known prior art comprise a muffle and a sole box located under the muffle.
  • the muffle includes a cavity in which food is introduced and which is surrounded by walls.
  • the walls of the muffle themselves, or more commonly the interior lining of these walls can be damaged by excessive temperature.
  • the heat from the gas burner (s) included in the bottom box under the muffle can damage the walls and more particularly the wall bottom of the muffle.
  • the inner lining of the bottom wall of the muffle can thus be damaged by the heat from the sole box. Indeed, the combustion products from the gas burner (s) contained in the bottom box enter the oven cavity through wall holes bottom of the muffle and licking part of the bottom wall of the muffle and in particular the periphery of these holes.
  • the invention provides a solution using a cover intermediate hole which is located between the bottom wall of the muffle and the box sole.
  • the particular shape of the intermediate cover allows the products to combustion from the sole box to enter the cavity without entering contact with the bottom wall of the muffle.
  • a gas oven comprising a muffle which includes a cavity bounded by walls, a sole box which is located under the muffle and which comprises at least one burner, the wall bottom of the muffle comprising at least one perforated zone, characterized in that the oven has an intermediate cover located between the wall bottom of the muffle and the bottom box, the intermediate cover comprising at least one perforated zone located opposite the perforated zone of the wall bottom of the muffle, the holes in the hole area of the intermediate cover being substantially opposite holes in the bottom wall of the muffle, the ratio of the size of the holes in the hole area of the intermediate cover and the size of the holes in the hole area of the bottom wall of the muffle of a part and the distance between the hole area of the intermediate cover and the area hole in the bottom wall of the muffle on the other hand being chosen so that the products of combustion coming from the burner and passing through them holes in the hole in the middle cover pass through the holes in the perforated area of the bottom wall of the muffle without coming into contact with the bottom wall
  • FIG. 1 schematically shows a partially view exploded in perspective of a preferred embodiment of a gas oven 7 according to the invention.
  • the oven 7 has a muffle 6 and a bottom box 5.
  • the sole box 5 has at least one burner 50.
  • a single burner 50 is shown in Figure 1 for example, but the sole box 5 may include several burners 50.
  • the burner 50 is shown diagrammatically under hatched area shape.
  • the muffle 6 has a cavity 1 in which food is introduced.
  • the cavity 1 is surrounded by walls 2 and 3.
  • the wall 3 is the bottom wall of the muffle 6 while the walls 2 are the other walls of the muffle 6.
  • the bottom wall 3 has at least one zone hole 30.
  • Each hole area 30 has at least one hole 31, of preferably several holes 31.
  • the or the burners 50 may or may not be located opposite the zone or zones holes 30 in the bottom wall 3 of the muffle 6.
  • the burner 50 placed in the center of a bottom box 5, is not opposite the perforated areas 30 placed at the ends of the bottom wall 3 of the muffle 6.
  • the intermediate cover 4 comprises at least a hole area 40 each comprising at least one hole 41 and preferably several holes 41.
  • the hole area (s) 40 of the cover intermediate 4 are located opposite perforated areas 30 of the wall lower 3.
  • Each perforated area 40 of the intermediate cover 4 is located opposite a perforated area 30 of the lower wall 3.
  • the intermediate cover 4 has two perforated areas 40 which are located opposite the two perforated zones 30 of the lower wall 3.
  • the holes 41 of the hole area (s) 40 of the cover intermediate 4 are located substantially opposite holes 31 of the one or more perforated areas 30 of the lower wall 3. The optimum is reached when the holes 41 are strictly opposite holes 31, but holes 41 may be slightly offset from the corresponding holes 31 and be only partially opposite these holes 31: the protective effect of the lower wall 3 is still obtained but to a lesser extent.
  • the holes 41 of the perforated area 40 of the intermediate cover 4 can for example have the form of simple holes in the substantially flat surface which the hole area 40 at the holes 41.
  • the holes 41 can also by example show the form of chimneys rising towards the bottom wall 3, from the average surface of the hole area 40. Said chimneys can even open into cavity 1 and rise above the bottom wall 3. In the latter case, part of the cover intermediate 4, namely the upper end of the chimneys, is located above from the level of the lower wall 3. In the following text, except contrary mention, one will speak of “holes 41” to indicate all the forms for making the holes 41 previously described and for “simple holes” the embodiment in which the holes 41 remain at the same level as the average surface of the perforated area 40 of the intermediate cover 4.
  • the sole box 5 preferably does not have a wall upper, it is covered by the intermediate cover 4.
  • the cover intermediate 4 can also for example be integrated into the sole box 5 of so as to become the upper wall of the sole box 5.
  • a burner 50 two zones holes 30 in the bottom wall 3 and two holes 40 in the cover intermediate 4, as in FIG. 1 for example, without limiting the generality of the invention which applies to an oven 7 comprising at least one burner 50, at least one perforated zone 30 of the lower wall 3 and at least zone hole 40 in the intermediate cover 4.
  • the intermediate cover 4 can be made in one piece or in several pieces whether or not linked between them.
  • the combustion products from the burner 50 of the sole box 5 pass through holes 41 of the perforated areas 40 of the cover intermediate 4, then pass through the holes 31 of the perforated zones 30 of the wall lower 3 before entering the cavity 1.
  • the size ratio of the different holes, ratio between the size of a hole 41 of a hole area 40 of the intermediate cover 4 and the size of a corresponding hole 31, that is to say located opposite, of a perforated zone 30 of the lower wall 3, on the one hand, and the distance between this hole 41 and the corresponding hole 31, that is to say located at look of said hole 41, are chosen so that the products of combustion coming out of the holes 41 of the perforated areas 40 of the cover intermediate 4 pass through the holes 31 of the perforated zones 30 of the wall lower 3 without coming into contact with the lower wall 3.
  • the wall lower 3 is not deteriorated by direct contact with the products of combustion which are at a very high temperature and which convey a very important heat.
  • the intermediate cover 4 is produced in one or several materials with a high thermal conductivity of so that the intermediate cover 4 has a conductivity sufficient heat for the heat input from the burner 50 is distributed over the surface of the intermediate cover 4 so as to avoid formation of hot spots on the bottom wall 3 of the muffle 6.
  • the contribution thermal from the sole box 5 and more particularly from the burner 50 is thus better distributed over the entire surface of the intermediate cover 4.
  • the heat then propagates from the intermediate cover 4 to the wall lower 3 is then better distributed equally over the entire surface of the bottom wall 3, which prevents the formation of hot spots on the bottom wall 3.
  • the intermediate cover 4 is advantageously made of a sheet with high thermal conductivity, in steel for example.
  • the walls 2 and 3 in general and the bottom wall 3 of the muffle 6 in particular are preferably made of enameled sheet, that is to say in sheet metal covered with enamel.
  • Gold enamel can break for temperatures high, such as a temperature above 530 ° C.
  • the combustion products can reach when the oven 7 is in operating mode and at cruising speed, temperatures ranging for example up to about 800 ° C. It is therefore interesting to avoid that combustion products do not come into direct contact with the bottom wall 3 covered with enamel, when the combustion products from the burner 50 pass through the holes 31 of the perforated areas 30 of the bottom wall 3.
  • Figure 2 shows schematically the cover intermediate 4 of oven 7 which is shown as a whole in FIG. 1.
  • the dimensioning and positioning of the perforated zones 40 and of the holes 41 that these include, prevent products from combustion from the burner 50 do not come into direct contact with the bottom wall 3 of the muffle 6.
  • the perforated area 40 of the intermediate cover 4 is also a projecting area towards the bottom wall 3 of the muffle 6, as shown for example in Figures 1 and 2.
  • this projecting area reduces the distance between the perforated areas 30 of the wall lower 3 and the perforated areas 40 of the intermediate cover 4, which is an advantage as explained later, while increasing the rigidity of the intermediate cover 4, in particular when the latter is present under the shape of a metal sheet.
  • the projection area 40 has a trapezoidal shape, the base being directed towards the sole box 5, as shown for example in Figures 1 and 2.
  • the intermediate cover 4 is preferably a metal sheet the material of which has a high thermal conductivity, like steel for example.
  • the intermediate cover 4 can also be consisting of several sheets welded together or not.
  • FIG. 3 schematically represents a perspective view of a detail of the oven 7 represented in FIG. 1.
  • FIG. 3 partially represents a perforated zone 40 of the intermediate cover 4 and the corresponding perforated zone 30, that is to say located opposite said perforated area 40 of the intermediate cover 4, of the bottom wall 3 of the muffle 6.
  • the portions of perforated areas 30 and 40 are shown in dotted lines.
  • FIG. 3 only a hole 41 in the perforated zone 40 of the intermediate cover 4 and the corresponding hole 31 in the perforated zone 30 in the bottom wall 3 are shown, it being understood that the perforated zones 30 and 40 preferably each have several holes 31 and 41.
  • the holes 31 and 41 are circular, but they can have other shapes; what is said below for the diameter of the holes applies to their size in the case of holes of any shape: in the rest of the text and unless otherwise stated, the terms of size and diameter will be used interchangeably.
  • the hole 31 of the hole area 30 of the bottom wall 3 has a diameter ⁇ 3 .
  • the hole 41 of the hole area 40 of the intermediate cover 4 has a diameter ⁇ 4 .
  • Let X be the distance separating the two holes 31 and 41, that is to say, as for example in FIG. 3, the distance separating the plane of the perforated zone 30 from the bottom wall 3 and the plane of the perforated zone 40 of the intermediate cover 4.
  • all the holes 31 have the same size and all the holes 41 too, and the distance X remains constant over all of the holes 30 and 40, but the size of the holes of the same hole area can vary as well as the distance X, in which case the following remains valid locally at the level of two corresponding holes 31 and 41, that is to say that the relations given below remain valid for a hole 41 of the perforated zone 40 of the intermediate cover 4, for the corresponding hole 31 of the perforated zone 30 of the bottom wall 3, and for the distance X separating said holes 31 and 41.
  • FIG. 4 schematically represents a profile view of a detail of FIG. 3.
  • the hole 31, of diameter ⁇ 3 , of the perforated area 30 of the bottom wall 3 is separated by a distance X from the hole 41, of diameter ⁇ 4 , the perforated area 40 of the intermediate cover 4.
  • the combustion products PC coming from the burner 50, not shown in FIG. 4 are represented at the level of the crossing of the hole 41 of the perforated area 40 of the intermediate cover first and from hole 31 of the hole area 30 of the bottom wall 3 then.
  • the jet of combustion products PC has, after passing through the hole 41 of the perforated area 40 of the intermediate cover 4, first a substantially vertical area of height zv and then an expansion area of height ze.
  • the direction of propagation of the jet of combustion products PC is indicated by arrows inside the periphery of the jet.
  • the diameter of the jet of combustion products PC at the level of the hole 31 of the perforated zone 30 of the bottom wall 3 is noted ⁇ .
  • the jet of combustion products PC occupies the entire size of this hole 41.
  • the size ⁇ 4 of each hole 41 of the hole area 40 of the intermediate cover 4 is preferably chosen to be smaller than the size ⁇ 3 of the corresponding hole 31 of the perforated zone 30 of the bottom wall 3 of the muffle 6, so that the jet of combustion products PC, which has at the level of this hole 31 a diameter ⁇ substantially equal to or greater than the diameter ⁇ 4 of the hole 41 of the zone hole 40 of the intermediate cover 4, does not come into contact with the bottom wall 3 when it passes through the holes 31 of the hole area 30 of the bottom wall 3.
  • the distance X between the holes 31 and 41 is advantageously chosen suf sufficiently small so that, at the level of the hole 31 of the perforated zone 30 of the lower wall 3, the jet of combustion products PC is still in its substantially vertical zone of height zv. We then have X which is less than or substantially equal to zv.
  • the size ⁇ 4 of hole 41 in area 40 of the intermediate cover 4 varies in the opposite direction to the distance X separating the two holes 31 and 41, that is to say that if one wants to increase the distance X, it is necessary to decrease the size ⁇ 4 of the hole 41, which is a drawback as seen above, and vice versa.
  • the distance X between the hole area 40 of the intermediate cover 4 and the hole area 30 of the bottom wall 3 of the muffle 6 is advantageously small enough that the jet of combustion products PC still has a substantially vertical direction at the level of the holes 31 of the perforated zone 30 of the bottom wall 3.
  • the diameter ⁇ 3 of the holes 31 of the perforated areas 30 of the bottom wall 3 being worth approximately 15mm
  • the diameter ⁇ 4 of the holes 41 of the perforated areas 40 of the intermediate cover 4 is worth approximately 10 to 12 mm while the distance X between holes 31 and 41 is approximately 7 to 8mm.
  • the ratio between holes 31 and 41 is approximately 1.5 while the ratio between hole 31 and distance X is approximately 2.

Description

L'invention concerne le domaine des fours de cuisson à gaz qui, sauf mention contraire, seront appelés fours gaz dans toute la suite du texte. L'invention concerne notamment le domaine des fours gaz dont le moufle comporte des parois ayant un revêtement pouvant être abímé par des températures excessives.The invention relates to the field of gas cooking ovens which, unless otherwise stated, will be called gas ovens throughout the text. The invention relates in particular to the field of gas ovens including the muffle has walls having a coating which can be damaged by excessive temperatures.

Les fours gaz de l'art antérieur connu comportent un moufle et une boíte sole située sous le moufle. Le moufle comprend une cavité dans laquelle les aliments sont introduits et qui est entourée par des parois. Les parois du moufle elles-mêmes, ou plus couramment le revêtement intérieur de ces parois, peuvent être endommagées par une température excessive. La chaleur issue du ou des brûleurs à gaz que comprend la boíte sole située sous le moufle peut détériorer les parois et plus particulièrement la paroi inférieure du moufle. Le revêtement intérieur de la paroi inférieure du moufle peut ainsi être abímé par la chaleur issue de la boíte sole. En effet, les produits de combustion issus du ou des brûleurs à gaz contenus dans la boíte sole entrent dans la cavité du four en passant par des trous de la paroi inférieure du moufle et en léchant une partie de la paroi inférieure du moufle et en particulier le pourtour de ces trous. Localement, la température augmente beaucoup au niveau de cette partie de la paroi inférieure et en particulier au niveau des trous, et le revêtement intérieur de la paroi inférieure du moufle, ou la paroi inférieure du moufle elle-même le cas échéant, se détériore sous l'action de la chaleur. Ce problème de détérioration en température de la paroi inférieure du moufle ne semble pas avoir été résolu dans les fours de l'art antérieur.The gas ovens of the known prior art comprise a muffle and a sole box located under the muffle. The muffle includes a cavity in which food is introduced and which is surrounded by walls. The walls of the muffle themselves, or more commonly the interior lining of these walls can be damaged by excessive temperature. The heat from the gas burner (s) included in the bottom box under the muffle can damage the walls and more particularly the wall bottom of the muffle. The inner lining of the bottom wall of the muffle can thus be damaged by the heat from the sole box. Indeed, the combustion products from the gas burner (s) contained in the bottom box enter the oven cavity through wall holes bottom of the muffle and licking part of the bottom wall of the muffle and in particular the periphery of these holes. Locally, the temperature increases a lot at this part of the lower wall and in particular at the level of the holes, and the interior lining of the wall bottom of the muffle, or the bottom wall of the muffle itself the case if necessary, deteriorates under the action of heat. This problem of deterioration in temperature of the bottom wall of the muffle does not seem have been resolved in the ovens of the prior art.

L'invention propose une solution utilisant un couvercle intermédiaire troué qui est situé entre la paroi inférieure du moufle et la boíte sole. La forme particulière du couvercle intermédiaire permet aux produits de combustion issus de la boíte sole d'entrer dans la cavité sans entrer en contact avec la paroi inférieure du moufle.The invention provides a solution using a cover intermediate hole which is located between the bottom wall of the muffle and the box sole. The particular shape of the intermediate cover allows the products to combustion from the sole box to enter the cavity without entering contact with the bottom wall of the muffle.

Selon l'invention, il est prévu un four gaz comportant un moufle qui comprend une cavité délimitée par des parois, une boíte sole qui est située sous le moufle et qui comprend au moins un brûleur, la paroi inférieure du moufle comportant au moins une zone trouée, caractérisé en ce que le four comporte un couvercle intermédiaire situé entre la paroi inférieure du moufle et la boíte sole, le couvercle intermédiaire comportant au moins une zone trouée située en regard de la zone trouée de la paroi inférieure du moufle, les trous de la zone trouée du couvercle intermédiaire étant sensiblement en regard de trous de la paroi inférieure du moufle, le rapport entre la taille des trous de la zone trouée du couvercle intermédiaire et la taille des trous de la zone trouée de la paroi inférieure du moufle d'une part et la distance entre la zone trouée du couvercle intermédiaire et la zone trouée de la paroi inférieure du moufle d'autre part étant choisis de manière à ce que les produits de combustion provenant du brûleur et passant par les trous de la zone trouée du couvercle intermédiaire traversent les trous de la zone trouée de la paroi inférieure du moufle sans entrer en contact avec la paroi inférieure du moufle.According to the invention, there is provided a gas oven comprising a muffle which includes a cavity bounded by walls, a sole box which is located under the muffle and which comprises at least one burner, the wall bottom of the muffle comprising at least one perforated zone, characterized in that the oven has an intermediate cover located between the wall bottom of the muffle and the bottom box, the intermediate cover comprising at least one perforated zone located opposite the perforated zone of the wall bottom of the muffle, the holes in the hole area of the intermediate cover being substantially opposite holes in the bottom wall of the muffle, the ratio of the size of the holes in the hole area of the intermediate cover and the size of the holes in the hole area of the bottom wall of the muffle of a part and the distance between the hole area of the intermediate cover and the area hole in the bottom wall of the muffle on the other hand being chosen so that the products of combustion coming from the burner and passing through them holes in the hole in the middle cover pass through the holes in the perforated area of the bottom wall of the muffle without coming into contact with the bottom wall of the muffle.

L'invention sera mieux comprise et d'autres particularités et avantages apparaítront à l'aide de la description ci-après et des dessins joints, donnés à titre d'exemples, où :

  • la figure 1 représente schématiquement une vue partiellement éclatée en perspective d'un mode de réalisation préférentiel d'un four gaz selon l'invention ;
  • la figure 2 représente schématiquement le couvercle intermédiaire du four représenté à la figure 1 ;
  • la figure 3 représente schématiquement une vue en perspective d'un détail du four représenté sur la figure 1 ;
  • la figure 4 représente schématiquement une vue de profil d'un détail de la figure 3.
The invention will be better understood and other features and advantages will become apparent from the following description and the attached drawings, given by way of examples, in which:
  • Figure 1 schematically shows a partially exploded perspective view of a preferred embodiment of a gas oven according to the invention;
  • Figure 2 schematically shows the intermediate cover of the oven shown in Figure 1;
  • Figure 3 schematically shows a perspective view of a detail of the furnace shown in Figure 1;
  • FIG. 4 schematically represents a profile view of a detail of FIG. 3.

La figure 1 représente schématiquement une vue partiellement éclatée en perspective d'un mode de réalisation préférentiel d'un four gaz 7 selon l'invention. Le four 7 comporte un moufle 6 et une boíte sole 5. La boíte sole 5 comporte au moins un brûleur 50. Un seul brûleur 50 est représenté sur la figure 1 par exemple, mais la boíte sole 5 peut comporter plusieurs brûleurs 50. Le brûleur 50 est représenté schématiquement sous forme de zone hachurée. Le moufle 6 comporte une cavité 1 dans laquelle les aliments sont introduits. La cavité 1 est entourée de parois 2 et 3. La paroi 3 est la paroi inférieure du moufle 6 tandis que les parois 2 sont les autres parois du moufle 6. La paroi inférieure 3 comporte au moins une zone trouée 30. Chaque zone trouée 30 comporte au moins un trou 31, de préférence plusieurs trous 31. Sur la figure 1 par exemple, deux zones trouées 30 sont représentées, comportant chacune plusieurs trous 31. Le ou les brûleurs 50 peuvent être situés ou non en regard de la ou des zones trouées 30 de la paroi inférieure 3 du moufle 6. Sur la figure 1 par exemple, le brûleur 50, placé au centre d'une boíte sole 5, n'est pas en regard des zones trouées 30 placés aux extrémités de la paroi inférieure 3 du moufle 6. Entre la paroi inférieure 3 du moufle 6 et la boíte sole 5 est situé un couvercle intermédiaire 4. Le couvercle intermédiaire 4 comporte au moins une zone trouée 40 comportant chacune au moins un trou 41 et de préférence plusieurs trous 41. La ou les zones trouées 40 du couvercle intermédiaire 4 sont situées en regard de zones trouées 30 de la paroi inférieure 3. Chaque zone trouée 40 du couvercle intermédiaire 4 est située en regard d'une zone trouée 30 de la paroi inférieure 3. Mais l'une des zones trouées 30 de la paroi inférieure 3 peut ne pas être en regard d'une zone trouée 40 du couvercle intermédiaire 4 : cette zone trouée 30 de la paroi inférieure 3 est alors relativement inutile. Sur la figure 1 par exemple, le couvercle intermédiaire 4 comporte deux zones trouées 40 qui sont situées en regard des deux zones trouées 30 de la paroi inférieure 3.Figure 1 schematically shows a partially view exploded in perspective of a preferred embodiment of a gas oven 7 according to the invention. The oven 7 has a muffle 6 and a bottom box 5. The sole box 5 has at least one burner 50. A single burner 50 is shown in Figure 1 for example, but the sole box 5 may include several burners 50. The burner 50 is shown diagrammatically under hatched area shape. The muffle 6 has a cavity 1 in which food is introduced. The cavity 1 is surrounded by walls 2 and 3. The wall 3 is the bottom wall of the muffle 6 while the walls 2 are the other walls of the muffle 6. The bottom wall 3 has at least one zone hole 30. Each hole area 30 has at least one hole 31, of preferably several holes 31. In FIG. 1 for example, two zones holes 30 are shown, each comprising several holes 31. The or the burners 50 may or may not be located opposite the zone or zones holes 30 in the bottom wall 3 of the muffle 6. In FIG. 1 for example, the burner 50, placed in the center of a bottom box 5, is not opposite the perforated areas 30 placed at the ends of the bottom wall 3 of the muffle 6. Between the bottom wall 3 of the muffle 6 and the bottom box 5 is located a intermediate cover 4. The intermediate cover 4 comprises at least a hole area 40 each comprising at least one hole 41 and preferably several holes 41. The hole area (s) 40 of the cover intermediate 4 are located opposite perforated areas 30 of the wall lower 3. Each perforated area 40 of the intermediate cover 4 is located opposite a perforated area 30 of the lower wall 3. But one of the areas holes 30 in the bottom wall 3 may not be facing an area hole 40 of the intermediate cover 4: this hole area 30 of the wall lower 3 is then relatively useless. In Figure 1 for example, the intermediate cover 4 has two perforated areas 40 which are located opposite the two perforated zones 30 of the lower wall 3.

Les trous 41 de la ou des zones trouées 40 du couvercle intermédiaire 4 sont situés sensiblement en regard de trous 31 de la ou des zones trouées 30 de la paroi inférieure 3. L'optimum est atteint lorsque les trous 41 sont rigoureusement en regard de trous 31, mais les trous 41 peuvent être légèrement décalés par rapport aux trous 31 correspondants et n'être que partiellement en regard de ces trous 31 : l'effet de protection de la paroi inférieure 3 est toujours obtenu mais dans une moindre mesure. Dans toute la suite du texte, sauf mention contraire, pour la position relative des trous 41 et des trous 31, on utilisera le terme « en regard » pour le terme « sensiblement en regard » avec la même signification. Les trous 41 de la zone trouée 40 du couvercle intermédiaire 4 peuvent par exemple avoir la forme de simples trous dans la surface sensiblement plane que présente la zone trouée 40 au niveau des trous 41. Les trous 41 peuvent également par exemple présenter la forme de cheminées s'élevant, vers la paroi inférieure 3, à partir de la surface moyenne de la zone trouée 40. Lesdites cheminées peuvent même être débouchantes dans la cavité 1 et s'élever au-dessus de la paroi inférieure 3. Dans ce dernier cas, une partie du couvercle intermédiaire 4, à savoir l'extrémité haute des cheminées, est située au-dessus du niveau de la paroi inférieure 3. Dans la suite du texte, sauf mention contraire, on parlera de « trous 41 » pour désigner toutes les formes de réalisation des trous 41 précédemment décrites et de « simples trous » la forme de réalisation dans laquelle les trous 41 restent au même niveau que la surface moyenne de la zone trouée 40 du couvercle intermédiaire 4.The holes 41 of the hole area (s) 40 of the cover intermediate 4 are located substantially opposite holes 31 of the one or more perforated areas 30 of the lower wall 3. The optimum is reached when the holes 41 are strictly opposite holes 31, but holes 41 may be slightly offset from the corresponding holes 31 and be only partially opposite these holes 31: the protective effect of the lower wall 3 is still obtained but to a lesser extent. In throughout the text, unless otherwise stated, for the relative position of holes 41 and holes 31, we will use the term "opposite" for the term "Substantially opposite" with the same meaning. The holes 41 of the perforated area 40 of the intermediate cover 4 can for example have the form of simple holes in the substantially flat surface which the hole area 40 at the holes 41. The holes 41 can also by example show the form of chimneys rising towards the bottom wall 3, from the average surface of the hole area 40. Said chimneys can even open into cavity 1 and rise above the bottom wall 3. In the latter case, part of the cover intermediate 4, namely the upper end of the chimneys, is located above from the level of the lower wall 3. In the following text, except contrary mention, one will speak of “holes 41” to indicate all the forms for making the holes 41 previously described and for "simple holes" the embodiment in which the holes 41 remain at the same level as the average surface of the perforated area 40 of the intermediate cover 4.

La boíte sole 5 ne comporte de préférence pas de paroi supérieure, elle est recouverte par le couvercle intermédiaire 4. Le couvercle intermédiaire 4 peut aussi par exemple être intégré à la boíte sole 5 de manière à devenir la paroi supérieure de la boíte sole 5. Dans toute la suite du texte, sauf mention contraire, on considérera un brûleur 50, deux zones trouées 30 de la paroi inférieure 3 et deux zones trouées 40 du couvercle intermédiaire 4, comme sur la figure 1 par exemple, sans limiter la généralité de l'invention qui s'applique à un four 7 comportant au moins un brûleur 50, au moins une zone trouée 30 de la paroi inférieure 3 et au moins zone trouée 40 du couvercle intermédiaire 4. Le couvercle intermédiaire 4 peut être constitué en une seule pièce ou bien en plusieurs pièces liées ou non entre elles.The sole box 5 preferably does not have a wall upper, it is covered by the intermediate cover 4. The cover intermediate 4 can also for example be integrated into the sole box 5 of so as to become the upper wall of the sole box 5. In the following text, unless stated otherwise, consider a burner 50, two zones holes 30 in the bottom wall 3 and two holes 40 in the cover intermediate 4, as in FIG. 1 for example, without limiting the generality of the invention which applies to an oven 7 comprising at least one burner 50, at least one perforated zone 30 of the lower wall 3 and at least zone hole 40 in the intermediate cover 4. The intermediate cover 4 can be made in one piece or in several pieces whether or not linked between them.

Les produits de combustion issus du brûleur 50 de la boíte sole 5 passent au travers des trous 41 des zones trouées 40 du couvercle intermédiaire 4, puis traversent les trous 31 des zones trouées 30 de la paroi inférieure 3 avant d'entrer dans la cavité 1. Le rapport des tailles des différents trous, rapport entre la taille d'un trou 41 d'une zone trouée 40 du couvercle intermédiaire 4 et la taille d'un trou 31 correspondant, c'est-à-dire situé en regard, d'une zone trouée 30 de la paroi inférieure 3, d'une part, et la distance entre ce trou 41 et le trou 31 correspondant, c'est-à-dire situé en regard dudit trou 41, sont choisis de manière à ce que les produits de combustion sortant des trous 41 des zones trouées 40 du couvercle intermédiaire 4 traversent les trous 31 des zones trouées 30 de la paroi inférieure 3 sans entrer en contact avec la paroi inférieure 3. Ainsi la paroi inférieure 3 n'est pas détériorée par le contact direct des produits de combustion qui sont à une température très élevée et qui véhiculent une chaleur très importante.The combustion products from the burner 50 of the sole box 5 pass through holes 41 of the perforated areas 40 of the cover intermediate 4, then pass through the holes 31 of the perforated zones 30 of the wall lower 3 before entering the cavity 1. The size ratio of the different holes, ratio between the size of a hole 41 of a hole area 40 of the intermediate cover 4 and the size of a corresponding hole 31, that is to say located opposite, of a perforated zone 30 of the lower wall 3, on the one hand, and the distance between this hole 41 and the corresponding hole 31, that is to say located at look of said hole 41, are chosen so that the products of combustion coming out of the holes 41 of the perforated areas 40 of the cover intermediate 4 pass through the holes 31 of the perforated zones 30 of the wall lower 3 without coming into contact with the lower wall 3. Thus the wall lower 3 is not deteriorated by direct contact with the products of combustion which are at a very high temperature and which convey a very important heat.

De préférence, le couvercle intermédiaire 4 est réalisé dans un ou plusieurs matériaux présentant une conductivité thermique élevée de manière à ce que le couvercle intermédiaire 4 présente une conductivité thermique suffisante pour que l'apport thermique provenant du brûleur 50 soit réparti sur la surface du couvercle intermédiaire 4 de manière à éviter la formation de points chauds sur la paroi inférieure 3 du moufle 6. L'apport thermique issu de la boíte sole 5 et plus particulièrement du brûleur 50 est ainsi mieux réparti sur l'ensemble de la surface du couvercle intermédiaire 4. La chaleur se propageant ensuite du couvercle intermédiaire 4 vers la paroi inférieure 3 est alors mieux réparti également sur l'ensemble de la surface de la paroi inférieure 3, ce qui permet d'éviter la formation de points chauds sur la paroi inférieure 3. Les points chauds qui correspondent à un apport thermique localement élevé, risquent d'endommager la paroi inférieure 3 surtout si celle-ci possède un revêtement intérieur relativement fragile : les points chauds sont de préférence à éviter. Le couvercle intermédiaire 4 est avantageusement réalisé en une tôle à conductivité thermique élevée, en acier par exemple.Preferably, the intermediate cover 4 is produced in one or several materials with a high thermal conductivity of so that the intermediate cover 4 has a conductivity sufficient heat for the heat input from the burner 50 is distributed over the surface of the intermediate cover 4 so as to avoid formation of hot spots on the bottom wall 3 of the muffle 6. The contribution thermal from the sole box 5 and more particularly from the burner 50 is thus better distributed over the entire surface of the intermediate cover 4. The heat then propagates from the intermediate cover 4 to the wall lower 3 is then better distributed equally over the entire surface of the bottom wall 3, which prevents the formation of hot spots on the bottom wall 3. The hot spots which correspond to a contribution locally high thermal risk of damaging the bottom wall 3 especially if it has a relatively fragile interior coating: hot spots are preferably to be avoided. The intermediate cover 4 is advantageously made of a sheet with high thermal conductivity, in steel for example.

Les parois 2 et 3 en général et la paroi inférieure 3 du moufle 6 en particulier sont préférentiellement réalisées en tôle émaillée, c'est-à-dire en tôle recouverte d'émail. Or l'émail peut casser pour des températures élevées comme par exemple une température supérieure à 530°C. Les produits de combustion, quant à eux, peuvent atteindre, lorsque le four 7 est en mode de fonctionnement et en régime de croisière, des températures allant par exemple jusqu'à environ 800°C. Il est donc intéressant d'éviter que les produits de combustion n'entrent en contact direct avec la paroi inférieure 3 recouverte d'émail, lorsque les produits de combustion en provenance du brûleur 50 traversent les trous 31 des zones trouées 30 de la paroi inférieure 3.The walls 2 and 3 in general and the bottom wall 3 of the muffle 6 in particular are preferably made of enameled sheet, that is to say in sheet metal covered with enamel. Gold enamel can break for temperatures high, such as a temperature above 530 ° C. The combustion products, on the other hand, can reach when the oven 7 is in operating mode and at cruising speed, temperatures ranging for example up to about 800 ° C. It is therefore interesting to avoid that combustion products do not come into direct contact with the bottom wall 3 covered with enamel, when the combustion products from the burner 50 pass through the holes 31 of the perforated areas 30 of the bottom wall 3.

La figure 2 représente schématiquement le couvercle intermédiaire 4 du four 7 qui est représenté dans son ensemble à la figure 1. Le dimensionnement et le positionnement des zones trouées 40 et des trous 41 que celles-ci comprennent, permettent d'éviter que les produits de combustion en provenance du brûleur 50 n'entrent en contact direct avec la paroi inférieure 3 du moufle 6.Figure 2 shows schematically the cover intermediate 4 of oven 7 which is shown as a whole in FIG. 1. The dimensioning and positioning of the perforated zones 40 and of the holes 41 that these include, prevent products from combustion from the burner 50 do not come into direct contact with the bottom wall 3 of the muffle 6.

De préférence, la zone trouée 40 du couvercle intermédiaire 4 est aussi une zone de saillie vers la paroi inférieure 3 du moufle 6, comme représenté par exemple sur les figures 1 et 2. Pour une taille donnée des trous 31 des zones trouées 30 de la paroi inférieure 3, cette zone de saillie permet de diminuer la distance entre les zones trouées 30 de la paroi inférieure 3 et les zones trouées 40 du couvercle intermédiaire 4, ce qui est un avantage comme expliqué ultérieurement, tout en augmentant la rigidité du couvercle intermédiaire 4, en particulier lorsque celui-ci se présente sous la forme d'une tôle métallique. Avantageusement, la zone de saillie 40 a une forme trapézoïdale, la base étant dirigée vers la boíte sole 5, comme représenté par exemple sur les figures 1 et 2.Preferably, the perforated area 40 of the intermediate cover 4 is also a projecting area towards the bottom wall 3 of the muffle 6, as shown for example in Figures 1 and 2. For a given size of holes 31 of the perforated areas 30 of the bottom wall 3, this projecting area reduces the distance between the perforated areas 30 of the wall lower 3 and the perforated areas 40 of the intermediate cover 4, which is an advantage as explained later, while increasing the rigidity of the intermediate cover 4, in particular when the latter is present under the shape of a metal sheet. Advantageously, the projection area 40 has a trapezoidal shape, the base being directed towards the sole box 5, as shown for example in Figures 1 and 2.

Le couvercle intermédiaire 4 est de préférence une tôle métallique dont le matériau de réalisation possède une forte conductivité thermique, comme l'acier par exemple. Le couvercle intermédiaire 4 peut aussi être constitué par plusieurs tôles soudées ou non entre elles.The intermediate cover 4 is preferably a metal sheet the material of which has a high thermal conductivity, like steel for example. The intermediate cover 4 can also be consisting of several sheets welded together or not.

La figure 3 représente schématiquement une vue en perspective d'un détail du four 7 représenté sur la figure 1. La figure 3 représente partiellement une zone trouée 40 du couvercle intermédiaire 4 et la zone trouée 30 correspondante, c'est-à-dire située en regard de ladite zone trouée 40 du couvercle intermédiaire 4, de la paroi inférieure 3 du moufle 6. Les parties de zones trouées 30 et 40 sont représentées en traits pointillés. Sur la figure 3, seuls un trou 41 de la zone trouée 40 du couvercle intermédiaire 4 et le trou 31 correspondant de la zone trouée 30 de la paroi inférieure 3 sont représentés, étant entendu que les zones trouées 30 et 40 comportent de préférence chacune respectivement plusieurs trous 31 et 41. De préférence les trous 31 et 41 sont circulaires, mais ils peuvent avoir d'autres formes ; ce qui est dit dans la suite pour le diamètre des trous vaut pour leur taille dans le cas de trous de forme quelconque : dans la suite du texte et sauf mention contraire, les termes de taille et de diamètre seront indifféremment employés. Le trou 31 de la zone trouée 30 de la paroi inférieure 3 a un diamètre Φ3. Le trou 41 de la zone trouée 40 du couvercle intermédiaire 4 a un diamètre Φ4. Soit X la distance séparant les deux trous 31 et 41, c'est-à-dire, comme par exemple sur la figure 3, la distance séparant le plan de la zone trouée 30 de la paroi inférieure 3 et le plan de la zone trouée 40 du couvercle intermédiaire 4. De préférence, tous les trous 31 ont la même taille et tous les trous 41 aussi, et la distance X reste constante sur l'ensemble des zones trouées 30 et 40, mais la taille des trous d'une même zone trouée peut varier ainsi que la distance X, auquel cas ce qui suit reste valable localement au niveau de deux trous correspondants 31 et 41, c'est-à-dire que les relations données ci-après restent valables pour un trou 41 de la zone trouée 40 du couvercle intermédiaire 4, pour le trou 31 correspondant de la zone trouée 30 de la paroi inférieure 3, et pour la distance X séparant lesdits trous 31 et 41.FIG. 3 schematically represents a perspective view of a detail of the oven 7 represented in FIG. 1. FIG. 3 partially represents a perforated zone 40 of the intermediate cover 4 and the corresponding perforated zone 30, that is to say located opposite said perforated area 40 of the intermediate cover 4, of the bottom wall 3 of the muffle 6. The portions of perforated areas 30 and 40 are shown in dotted lines. In FIG. 3, only a hole 41 in the perforated zone 40 of the intermediate cover 4 and the corresponding hole 31 in the perforated zone 30 in the bottom wall 3 are shown, it being understood that the perforated zones 30 and 40 preferably each each have several holes 31 and 41. Preferably the holes 31 and 41 are circular, but they can have other shapes; what is said below for the diameter of the holes applies to their size in the case of holes of any shape: in the rest of the text and unless otherwise stated, the terms of size and diameter will be used interchangeably. The hole 31 of the hole area 30 of the bottom wall 3 has a diameter Φ 3 . The hole 41 of the hole area 40 of the intermediate cover 4 has a diameter Φ 4 . Let X be the distance separating the two holes 31 and 41, that is to say, as for example in FIG. 3, the distance separating the plane of the perforated zone 30 from the bottom wall 3 and the plane of the perforated zone 40 of the intermediate cover 4. Preferably, all the holes 31 have the same size and all the holes 41 too, and the distance X remains constant over all of the holes 30 and 40, but the size of the holes of the same hole area can vary as well as the distance X, in which case the following remains valid locally at the level of two corresponding holes 31 and 41, that is to say that the relations given below remain valid for a hole 41 of the perforated zone 40 of the intermediate cover 4, for the corresponding hole 31 of the perforated zone 30 of the bottom wall 3, and for the distance X separating said holes 31 and 41.

La figure 4 représente schématiquement une vue de profil d'un détail de la figure 3. Le trou 31, de diamètre Φ3, de la zone trouée 30 de la paroi inférieure 3 est séparé par une distance X du trou 41, de diamètre Φ4, de la zone trouée 40 du couvercle intermédiaire 4. Les produits de combustion PC en provenance du brûleur 50, non représenté sur la figure 4, sont représentés au niveau de la traversée du trou 41 de la zone trouée 40 du couvercle intermédiaire d'abord et du trou 31 de la zone trouée 30 de la paroi inférieure 3 ensuite. Le jet des produits de combustion PC présente, après son passage par le trou 41 de la zone trouée 40 du couvercle intermédiaire 4, d'abord une zone sensiblement verticale de hauteur zv puis une zone d'expansion de hauteur ze. La direction de propagation du jet des produits de combustion PC est indiquée par des flèches à l'intérieur du pourtour du jet. Le diamètre du jet des produits de combustion PC au niveau du trou 31 de la zone trouée 30 de la paroi inférieure 3 est noté Φ. Au niveau du trou 41 de la zone trouée 40 du couvercle intermédiaire 4, le jet de produits de combustion PC occupe toute la taille de ce trou 41.FIG. 4 schematically represents a profile view of a detail of FIG. 3. The hole 31, of diameter Φ 3 , of the perforated area 30 of the bottom wall 3 is separated by a distance X from the hole 41, of diameter Φ 4 , the perforated area 40 of the intermediate cover 4. The combustion products PC coming from the burner 50, not shown in FIG. 4, are represented at the level of the crossing of the hole 41 of the perforated area 40 of the intermediate cover first and from hole 31 of the hole area 30 of the bottom wall 3 then. The jet of combustion products PC has, after passing through the hole 41 of the perforated area 40 of the intermediate cover 4, first a substantially vertical area of height zv and then an expansion area of height ze. The direction of propagation of the jet of combustion products PC is indicated by arrows inside the periphery of the jet. The diameter of the jet of combustion products PC at the level of the hole 31 of the perforated zone 30 of the bottom wall 3 is noted Φ. At the hole 41 of the perforated zone 40 of the intermediate cover 4, the jet of combustion products PC occupies the entire size of this hole 41.

Compte tenu de la forme particulière mais néanmoins usuelle du jet des produits de combustion PC, la taille Φ4 de chaque trou 41 de la zone trouée 40 du couvercle intermédiaire 4 est choisie de préférence inférieure à la taille Φ3 du trou 31 correspondant de la zone trouée 30 de la paroi inférieure 3 du moufle 6, de manière à ce que le jet de produits de combustion PC, qui présente au niveau de ce trou 31 un diamètre Φ sensiblement égal ou supérieur au diamètre Φ4 du trou 41 de la zone trouée 40 du couvercle intermédiaire 4, n'entre pas en contact avec la paroi inférieure 3 lors de sa traversée des trous 31 de la zone trouée 30 de la paroi inférieure 3. Pour éviter d'avoir des trous 41 de la zone trouée 40 du couvercle intermédiaire 4 qui soient trop petits, ce qui aurait l'inconvénient d'être difficile à réaliser et d'élargir prématurément le jet de produits de combustion PC, la distance X entre les trous 31 et 41 est avantageusement choisie suffisamment petite pour qu'au niveau du trou 31 de la zone trouée 30 de la paroi inférieure 3, le jet de produits de combustion PC soit encore dans sa zone sensiblement verticale de hauteur zv. On a alors X qui est inférieure ou sensiblement égale à zv. Pour une taille Φ3 donnée de trou 31 de la zone trouée 30 de la paroi inférieure 3, la taille Φ4 du trou 41 de la zone 40 du couvercle intermédiaire 4 varie dans le sens inverse de la distance X séparant les deux trous 31 et 41, c'est-à-dire que si l'on veut augmenter la distance X, il faut diminuer la taille Φ4 du trou 41, ce qui est un inconvénient comme vu plus haut, et vice-versa. Pour une taille Φ4 choisie de trou 41 de la zone trouée 40 du couvercle intermédiaire 4, la distance X entre la zone trouée 40 du couvercle intermédiaire 4 et la zone trouée 30 de la paroi inférieure 3 du moufle 6 est avantageusement suffisamment petite pour que le jet des produits de combustion PC ait encore une direction sensiblement verticale au niveau des trous 31 de la zone trouée 30 de la paroi inférieure 3.Given the particular but nevertheless usual shape of the jet of combustion products PC, the size Φ 4 of each hole 41 of the hole area 40 of the intermediate cover 4 is preferably chosen to be smaller than the size Φ 3 of the corresponding hole 31 of the perforated zone 30 of the bottom wall 3 of the muffle 6, so that the jet of combustion products PC, which has at the level of this hole 31 a diameter Φ substantially equal to or greater than the diameter Φ 4 of the hole 41 of the zone hole 40 of the intermediate cover 4, does not come into contact with the bottom wall 3 when it passes through the holes 31 of the hole area 30 of the bottom wall 3. To avoid having holes 41 of the hole area 40 of the intermediate cover 4 which are too small, which would have the drawback of being difficult to achieve and of prematurely widening the jet of combustion products PC, the distance X between the holes 31 and 41 is advantageously chosen suf sufficiently small so that, at the level of the hole 31 of the perforated zone 30 of the lower wall 3, the jet of combustion products PC is still in its substantially vertical zone of height zv. We then have X which is less than or substantially equal to zv. For a given size Φ 3 of hole 31 in the hole area 30 of the bottom wall 3, the size Φ 4 of hole 41 in area 40 of the intermediate cover 4 varies in the opposite direction to the distance X separating the two holes 31 and 41, that is to say that if one wants to increase the distance X, it is necessary to decrease the size Φ 4 of the hole 41, which is a drawback as seen above, and vice versa. For a chosen size Φ 4 of hole 41 of the hole area 40 of the intermediate cover 4, the distance X between the hole area 40 of the intermediate cover 4 and the hole area 30 of the bottom wall 3 of the muffle 6 is advantageously small enough that the jet of combustion products PC still has a substantially vertical direction at the level of the holes 31 of the perforated zone 30 of the bottom wall 3.

Dans un exemple numérique préférentiel selon l'invention, pour un diamètre Φ3 des trou 31 des zones trouées 30 de la paroi inférieure 3 valant environ 15mm, le diamètre Φ4 des trous 41 des zones trouées 40 du couvercle intermédiaire 4 vaut environ 10 à 12 mm tandis que la distance X entre les trous 31 et 41 vaut environ 7 à 8mm. Le rapport entre les trous 31 et 41 vaut environ 1,5 tandis que le rapport entre le trou 31 et la distance X vaut environ 2.In a preferred numerical example according to the invention, for a diameter Φ 3 of the holes 31 of the perforated areas 30 of the bottom wall 3 being worth approximately 15mm, the diameter Φ 4 of the holes 41 of the perforated areas 40 of the intermediate cover 4 is worth approximately 10 to 12 mm while the distance X between holes 31 and 41 is approximately 7 to 8mm. The ratio between holes 31 and 41 is approximately 1.5 while the ratio between hole 31 and distance X is approximately 2.

Claims (15)

  1. Gas oven comprising a muffle which comprises a cavity (1) delimited by walls (2, 3), a combustion chamber (5) which is situated under the muffle (6) and which comprises at least one burner (50), the bottom wall (3) of the muffle (6) comprising at least one perforated area (30), characterised in that the oven (7) comprises an intermediate cover (4) situated between the bottom wall (3) of the muffle (6) and the combustion chamber (5), the intermediate cover (4) comprising at least one perforated area (40) situated opposite the perforated area (30) of the bottom wall (3) of the muffle (6), the holes (41) in the perforated area (40) of the intermediate cover (4) being substantially opposite holes (31) in the perforated area (30) of the bottom wall (3) of the muffle (6), the ratio between the size (4) of the holes (41) in the perforated area (40) of the intermediate cover (4) and the size (3) of the holes (31) in the perforated area (30) of the bottom wall (3) of the muffle (6) on the one hand and the distance (X) between the perforated area (40) of the intermediate cover (4) and the perforated area (30) of the bottom wall (3) of the muffle (6) on the other hand being chosen so that the combustion products (PC) coming from the burner (50) and passing through the holes (41) in the perforated area (40) of the intermediate cover (4) pass through the holes (31) in the perforated area (30) of the bottom wall (3) of the muffle (6) without coming into contact with the bottom wall (3) of the muffle (6).
  2. Gas oven according to Claim 1, characterised in that the perforated area (40) of the intermediate cover (4) is also an area projecting towards the bottom wall (3) of the muffle (6).
  3. Gas oven according to Claim 2, characterised in that the projecting area (40) has a trapezoidal shape, the base being directed towards the combustion chamber (5).
  4. Gas oven according to any one of the preceding claims, characterised in that the holes (41) in the perforated area (40) of the intermediate cover (4) are simple holes in the surface of the perforated area (40) of the intermediate cover (4).
  5. Gas oven according to any one of Claims 1 to 4, characterised in that the holes (41) in the perforated area (40) of the intermediate cover (4) are respectively situated at the end of chimneys rising towards the bottom wall (3) of the muffle (6) from the middle surface of the perforated area (40) of the intermediate cover (4).
  6. Gas oven according to Claim 5, characterised in that the chimneys open out in the cavity (1) of the muffle (6).
  7. Gas oven according to any one of the preceding claims, characterised in that the size (4) of each hole (41) in the perforated area (40) of the intermediate cover (4) is less than the size (3) of the corresponding hole (3) in the perforated area (30) of the bottom wall (3) of the muffle (6).
  8. Gas oven according to any one of the preceding claims, characterised in that the distance (X) between the perforated area (40) of the intermediate cover (4) and the perforated area (30) of the bottom wall (3) of the muffle (6) is sufficiently small for the jet of combustion products (PC) to still have a substantially vertical direction at the holes (31) in the perforated area (30) of the bottom wall (3) of the muffle (6).
  9. Gas oven according to any one of the preceding claims, characterised in that the intermediate cover (4) has sufficient heat conductivity for the heat supply coming from the burner (50) to be distributed over the surface of the intermediate cover (4) so as to avoid the formation of hot points on the bottom wall (3) of the muffle (6).
  10. Gas oven according to any one of the preceding claims, characterised in that the walls (2, 3) of the muffle (6) are made from enamelled sheet metal.
  11. Gas oven according to any one of the preceding claims, characterised in that the intermediate cover (4) is a steel sheet.
  12. Gas oven according to any one of the preceding claims, characterised in that the ratio between the size (3) of the holes (31) in the perforated area (30) of the bottom wall (3) of the muffle (6) and the size (4) of the holes (41) in the perforated area (40) of the intermediate cover (4) is approximately 1.5.
  13. Gas oven according to Claim 12, characterised in that the size (4) of the holes (41) in the perforated area (40) of the intermediate cover (4) is approximately between 10 and 12 mm and in that the size (3) of the holes (31) in the perforated area (30) of the bottom wall (3) of the muffle (6) is approximately 15 mm.
  14. Gas oven according to any one of the preceding claims, characterised in that the ratio between firstly the size (3) of the holes (31) in the perforated area (30) of the bottom wall (3) of the muffle (6) and secondly the distance (X) between the perforated area (40) of the intermediate cover (4) and the perforated area (30) of the bottom wall (3) of the muffle (6) is approximately 2.
  15. Gas oven according to Claim 14, characterised in that the size (3) of the holes (31) in the perforated area (30) of the bottom wall (3) of the muffle (6) is approximately 15 mm and in that the distance (X) between the perforated area (40) of the intermediate cover (6) and the perforated area (30) of the bottom wall (3) of the muffle (6) is approximately between 7 and 8 mm.
EP20000403590 1999-12-23 2000-12-19 Gas oven Expired - Lifetime EP1111309B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9916399A FR2803023B1 (en) 1999-12-23 1999-12-23 GAS OVEN
FR9916399 1999-12-23

Publications (2)

Publication Number Publication Date
EP1111309A1 EP1111309A1 (en) 2001-06-27
EP1111309B1 true EP1111309B1 (en) 2004-03-03

Family

ID=9553766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000403590 Expired - Lifetime EP1111309B1 (en) 1999-12-23 2000-12-19 Gas oven

Country Status (2)

Country Link
EP (1) EP1111309B1 (en)
FR (1) FR2803023B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101064849B1 (en) * 2008-07-28 2011-09-14 엘지전자 주식회사 Reflecter and gas oven range comprising the same
WO2017097327A1 (en) * 2015-12-07 2017-06-15 Arcelik Anonim Sirketi Gas oven with improved heat protection
WO2018224158A1 (en) * 2017-06-09 2018-12-13 Arcelik Anonim Sirketi Gas oven having an improved air flow plate

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR772290A (en) * 1934-04-24 1934-10-26 Advanced burner for gas-fired heaters
GB863914A (en) * 1959-05-26 1961-03-29 Allied Ironfounders Ltd Improvements in or relating to gas cookers
GB2128876A (en) * 1982-09-27 1984-05-10 Meyer Manuf Co Ltd Cooking-devices

Also Published As

Publication number Publication date
EP1111309A1 (en) 2001-06-27
FR2803023B1 (en) 2002-02-22
FR2803023A1 (en) 2001-06-29

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