FR2853720A1 - Oven assembly for cooking foodstuff, has two superimposed cooking chambers including ventilating doors, and airflow separation device, disposed between ventilating doors, extending along width of doors - Google Patents

Abstract

The assembly has two superimposed cooking chambers (10, 20), where each cooking chamber includes a ventilating door (11, 21). The doors include multiple glass walls that are juxtaposed, where the walls form a coolant air circulating passage that circulates coolant air from bottom towards top of the door. An airflow separation device (40) disposed between the ventilating doors extends along the width of the doors.

Description

I

  The present invention relates to an assembly of cooking ovens.

  It applies generally to the field of domestic electric cooking ovens, including cooking ovens allowing cleaning of the cooking chamber by pyrolysis.

  In such a cooking oven, it is known to equip the facade of this oven with a ventilated door, to limit the temperatures in front, especially in pyrolysis operation.

  A regulation of use defined by the GIFAM (Inter-professional Group of Manufacturers of Home Appliances) defines in particular a so-called "cold" door when pyrolysis operation, the front temperature does not exceed 700C.

  In practice, each ventilated door thus generally consists of several superimposed glass walls.

  These walls provide between them at least one cooling air circulation passage in the plane of the door.

  The cold air inlet is generally made at an orifice disposed in the lower edge of the door, the air thus flowing from the bottom to the top of the door.

  This has an air outlet port near its top edge so that air flow can be obtained within the door.

  The air circulation is ensured by means of a suction fan located inside the oven and allowing for example to suck air through the door, at the exit port of air.

  The present invention is directed to an assembly of such cooking ovens, wherein two closed cooking chambers or a ventilated door respectively are superimposed one above the other.

  There is indeed a real need to provide two separate cooking chambers, the operation of these furnaces being controlled at a common control panel.

  However, the superposition of the cooking chambers, and in particular the facade doors which are thus found in the same plane superimposed one above the other, has the disadvantage of disturbing the aeraulics of these doors, so that the cooling function of these doors is no longer really assured.

  The present invention aims to solve the aforementioned drawbacks and to provide an assembly of cooking ovens ensuring proper cooling of the front doors, regardless of the conditions of use of these cooking ovens.

  For this purpose, the present invention is directed to an assembly of cooking ovens comprising two superimposed cooking chambers, each oven comprising a ventilated door comprising a plurality of walls providing at least one cooling air circulation passage circulating from the bottom to the top in the door of each oven.

  According to the invention, this assembly of cooking ovens comprises an airflow separation device arranged between the ventilated doors of the two superposed ovens.

  By thus using a separation device placed between the ventilated doors, it is possible to eliminate any interaction between the air flow of the two superimposed ventilated doors. Thus, the cooling of these doors can be provided independently of one another and be maintained at a level 25 in accordance with the regulations of use of the term "cold door".

  Simultaneous operation of these two cooking chambers is thus possible, while guaranteeing relatively low temperatures at the front doors.

  According to a preferred feature of the invention, the separation device comprises an upper face adapted to direct in the plane of the upper door a flow of air entering the upper ventilated door.

  Indeed, the presence of a lower door disposed under the lower edge of the upper door, is likely to interfere with the entry of the air flow inside the upper door. The separation device thus makes it possible to preferentially direct the flow of air inside the upper ventilated door. In practice, an upper face of the airflow separation device has a square profile, a first part of this upper face extending parallel to the lower edge of the upper ventilated door and a second part of this upper face s' extending perpendicularly to the lower edge of the upper vented door, the lower edge including at least one air inlet port 10 in the upper vented door.

  In order to ensure cooling of the ventilated door of the lower oven, a suction device is associated with the lower cooking oven and is adapted to draw air through an orifice located near the upper edge of the door ventilated lower and evacuate air in front of the oven.

  According to another preferred feature of the invention, a second suction device is associated with the upper cooking oven and is adapted to evacuate air near an upper edge of the upper ventilated door, this upper edge comprising minus one air outlet port of the upper vented door.

  Thus, this hot air outlet near the upper edge of the door causes a call for air inside this door. The depression thus formed at the top of the door makes it possible to draw air inside the door, and thus create a flow of clean air to promote the cooling of this upper door.

  According to another characteristic of the invention, the assembly of ovens comprises a separating element disposed at the rear of the cooking chambers adapted to separate air flows displaced by a first suction device associated with the lower cooking oven and by a second suction device associated with the upper cooking oven.

  The ventilation aeraulic of the cooking chambers can thus be set up independently.

  Other features and advantages of the invention will appear

  still in the description below.

  In the accompanying drawings, given as non-limiting examples: FIG. 1 is a diagrammatic elevational view of an assembly of furnaces according to one embodiment of the invention; FIG. 2 is a perspective view of a device for separating the air flows integrated into the assembly of cooking ovens of the figure; and - Figure 3 is a sectional view along the line 111.111 in Figure 2. will be described first with reference to Figure 1 an assembly of cooking ovens according to one embodiment of the invention.

  In principle, this furnace assembly comprises two superimposed cooking enclosures generally designated by the references and 20.

  Each of these cooking chambers 10, 20 comprises a front door 11, 21 generally pivotally mounted along a lower horizontal axis or along a lateral axis.

  These cooking chambers 10, 20 thus form two separate cooking cavities which can be used simultaneously or alternatively for cooking different foods.

  Conventionally, these cooking chambers 10, 20 comprise heating elements, generally arranged in the upper part and in the lower part of the cooking chamber, and a fan adapted to stir the air and thereby homogenize the cooking temperature, arranged generally close to the bottom wall of these enclosures 10, 20.

  These various heating and air stirring elements (not shown) are well known to those skilled in the art and do not need to be described in detail here.

  In order to ensure the operation of these cooking chambers, control and control means are arranged in the upper part of this assembly of cooking ovens.

  In particular, a control panel 30 is provided on the front of this assembly of ovens, above the front doors 11, 21 of the cooking chambers 10, 20.

  This control panel 30 may comprise various control levers and displays for controlling and managing the operation of one or the other cooking ovens thus superimposed.

  The object of the present invention is to improve the aeraulics of baking ovens thus superimposed, and only the elements related to the cooling air circulation system of this assembly of baking ovens are shown in FIG. .

  In particular, and as will be described in detail below, it is necessary to ensure a flow of cooling air around the cooking enclosures, to avoid a temperature rise too high of the body of these furnaces, and thus protect the environment, and in particular the built-in furniture inside which these cooking ovens are placed.

  Moreover, it is necessary to provide a circulation of cooling air at the control panel 30, and more particularly in the vicinity of the control board with electronic components that it is necessary to continuously cool.

  Finally, a circulation of cooling air must be provided at the level of the facade doors in order to maintain them at relatively low temperatures with respect to the temperatures present inside the cooking chambers 10, 20.

  In particular, the structure of these doors 11, 21 consists of several juxtaposed glass walls 11 ', 21' in a direction perpendicular to the plane of these doors 11, 21.

  These different walls 11 ', 21' thus provide between them a space to allow the circulation of a cooling air, preferably from the bottom to the top of the door.

  Advantageously refer to documents FR 2 726 633 and FR 2 746 903, in which the structure of such a cold door is described in detail.

  Each door 11, 21 has at its upper edge 11b, 21b an orifice 16, 26 air outlet and in its lower edge 11a, 21a, an orifice 17, 27, air inlet.

  These air inlet and outlet openings may be formed of slots, continuous or not, extending in the width of the doors 11, 21.

  In order to ensure the cooling of the environment of the first cooking chamber 10, a suction device 12 is associated with the lower baking oven. This suction device is a tangential 12 adapted to create a call for fresh air.

  This tangential 12 is mounted above the first cooking chamber 10, and towards the rear of the oven so that an air flow (arrow A) is provided at the rear of the cooking chamber 10 More specifically, the air can be sucked under the first cooking chamber 10, on the sides thereof and at the back, between the bottom of the cooking chamber 10 and the body 15 of the lower oven.

  An air guide 13 is provided at the outlet of this tangential 12 in order to direct the flow of air sucked by the tangential 12 at the outlet of the baking oven, on the front of the latter.

  This air guide 13 thus extends between the tangential 12 and the front of the oven.

  An outlet 14 opens on the front of the oven.

  The air flow (arrow B) thus flowing in the air guide 13 can be evacuated at the level of the facade. It will be noted that this flow of exhaust air is relatively hot. It corresponds to the fresh air sucked into the environment of the cooking chamber, which has warmed up in contact with this cooking chamber before being discharged through the discharge orifice 14.

  Furthermore, this tangential 12 is also adapted to suck air at a second air guide 15 disposed under the first air guide 13.

  More specifically, this second air guide 15 is disposed between the first air guide 13 and an upper wall of the first cooking chamber 10.

  Inside this second air guide 15 opens the orifice 16 which is close to the upper edge 11b of the ventilated door 11 of the lower cooking chamber.

  Thus, an air flow can be obtained inside this ventilated door 11 between the orifice 17 located at the lower edge 11a of the cold door and the outlet orifice 16 opening at the entrance of the second air guide 15.

  This circulation of air (arrow C) thus makes it possible to maintain this door 11 at a temperature close to 350 ° C in cooking operation, and not exceeding 650 ° C. during pyrolytic operation.

  The air flow thus recovered at the second air guide 15 is also sucked by the tangential 12 and is discharged at the level of the first air guide 13 into the flow of circulation illustrated by the arrow B. Similarly, a second suction device 22 is associated with the upper cooking oven.

  This second suction device is also a tangential 22 adapted in particular to suck up a flow of cooling air (arrow D) at the control panel 30 to ensure the permanent cooling of all the electronics of command.

  This tangential 22 is also adapted to ensure air circulation (arrow E) at the rear of the second cooking chamber 20 to maintain the body and the environment of the oven at a temperature avoiding any deterioration of the furniture. embedding.

  As before, the exit of this tangential is connected to an air guide 23 opening on the front of the oven. An air outlet 24 is thus provided at the end of this air guide 23, substantially at the front of the oven. An air flow (arrow F) can thus be evacuated at this orifice 24, in front of the oven.

  This orifice 24 opens near the upper edge 21b of the ventilated door 21 of the upper cooking chamber 20.

  Thanks to the air outlet port 26 provided in the upper edge 21b of the ventilated door 21, an air flow (arrow G) can be drawn through this door by Venturi effect.

  The air thus circulates inside the door of the inlet orifice 27 5 to the outlet orifice 26, thanks to the depression created at the top by the airflow (arrow F) evacuated at the orifice 24.

  In order to ensure the independence of the aeraulic of these two cooking ovens, a separating element 31 is provided at the rear of the oven, making it possible to close the air circulation spaces at the rear of the cooking chambers. 10, 20. In particular, with reference to FIG. 1, this separating element 31 makes it possible to make the air flows represented by the arrows A and E independent, the tangential 12 not creating a suction phenomenon at the level of FIG. of the second cooking chamber 20.

  This separating element is constituted by a separating plate 31 quasi-closed, pierced only openings allowing the passage of the control cables and supply of the lower baking oven. These cables make it possible to feed from the dashboard 30 the different operating elements of the first cooking chamber 10.

  In addition, and in accordance with the invention, at the facade of the furnace assembly, a separating device 40 is disposed between the ventilated doors 11, 21 of the two superposed firing chambers 10, 20.

  This separation device is illustrated in detail in FIGS. 2 and 3.

  In general, this separating device is formed of an elongated thermoplastic piece making it possible to separate the air flows between the two ventilated doors 11, 21.

  This separating piece 40 extends over the entire width of the doors 11, 21 so that it is arranged opposite one side of the upper edge 11b of the lower door 11 and the lower edge 21a of the upper door 21.

  This separating part 40 first comprises a lower face 41 which is adapted to direct the air flow (arrow B) discharged at the orifice 14 perpendicularly to the lower door i1.

  In practice, this lower face 41 forms a plane disposed parallel to the upper edge 11b of the ventilated cold door 11 and substantially above the orifice 14 opening to the air guide 13.

  The flow of air discharged at the orifice 14 is thus guided between this lower face 41 of the separation device 40 and the upper edge 11b of the ventilated door 11 so that it leaves in a direction substantially perpendicular to the lower ventilated door 11. The separation device 40 thus channels the flow of exhaust air, preventing it from disturbing the introduction of air at the lower edge 21a of the upper ventilated door 21.

  Moreover, this separating device 40 has an upper face 42 adapted to direct in the plane of the upper door 21 the flow of air entering at the orifice 27 located in the lower edge 21a of the upper door 21.

  In fact, unlike the situation in which the oven is arranged in an isolated manner so that air can easily enter the lower edge of the door, in such an assembly of stacked ovens, the flow of air entering the Upper door is impeded by the presence of the lower door and possibly by the air flow discharged at the lower cooking chamber 10 when it is in operation.

  In order to preferentially direct the flow of air in this upper door 21, the upper face 42 of the separation device has an angled profile: a first portion 42a of this upper face 42 extends parallel to the lower edge 21a of the ventilated door 21 and a second portion 42b of this upper face 42 extends perpendicularly to the lower edge of the upper ventilated door, towards the lower edge 21a.

  This upper face 42 thus forms a bracket whose closed angle is directed towards the orifice 27 of air inlet.

  The air thus sucked at this orifice 27 is guided by this upper face 42 so that after having been introduced perpendicularly to the door 21, its direction is modified thanks to the second part 42b of this upper face 42, so as to propagate substantially in the plane of the ventilated door 21.

  As explained above, the operation of this ventilated door 21 is based on the principle of the Venturi effect so that the depression created near the outlet orifice 26 causes a call for air allowing the introduction of air at the inlet port 27 located in the lower edge 21a of the ventilated door 21.

  Such a vacuum system only works if the pressure at the top of the door is lower than that at the bottom of the door. The particular shape of the upper face 42 of the separating device makes it possible to guarantee this pressure difference.

  It is important that this separation device 40 be reliably positioned on the front of the oven to avoid any disturbance in the air pressure present at the bottom of this ventilated door 21, near its lower edge 21a. .

  In this regard, the air separation device 40 is fixed with screws (not shown) on the front of the oven. Fixing lugs 43 may thus be provided on either side of the separating device 40 in order to allow mounting and screw fixing of this device on side walls of the lower oven 20.

  In addition, it is important that this airflow separation device is sufficiently protruding between the two ventilated doors 11, 21 in order to limit the effects of the orientation of the airflows, and thereby of the variations pressure causing an air duct malfunction of the door cooling system 11, 21.

  It is thus important that the end 44 of this separation device opens at least in a plane coinciding with the front plane of the ventilated doors 11, 21.

  Different shapes or notches 45, 46 may be provided for the passage and masking of fixing screws, without affecting the air flow.

  In addition, an extra thickness 47 may be provided to consolidate the profile of the piece 40.

  Thanks to this airflow separation device, it is possible to maintain a satisfactory aeraulic at the juxtaposed cooking ovens, and in particular to allow proper operation of the cooling system of the doors.

  It will be noted in particular that this device for separating the air flows makes it possible to ensure uniform operation of the cooling of the doors whatever the operating conditions of this assembly of cooking ovens, that is to say when the one or the other of the furnaces, or both simultaneously are in operation.

  Of course, several combinations of ovens can be made on the principle of the assembly according to the invention.

  In particular, in the example described, two types of aeraulic (by suction and by Venturi effect) are described to obtain the ventilation of the front doors of the furnaces.

  Of course, furnaces with the same cooling aeraulic could be juxtaposed.

  In addition, the ovens can be of different size.

  Finally, the number of ovens juxtaposed is not limited to two.

Claims (10)

  An assembly of cooking ovens comprising two superimposed cooking chambers (10, 20), each oven having a ventilated door (11, 21) comprising a plurality of walls (11 ', 21') providing at least one circulation passage of cooling air circulating from bottom to top in the door of each oven, characterized in that it comprises an airflow separation device (40) disposed between the ventilated doors (11, 21) of the two superposed ovens.   2. Oven assembly according to claim 1, characterized in that the separating device (40) comprises an upper face (42) adapted to direct in the plane of the upper door (21) a flow of air entering the upper ventilated door (21).   3. Furnace assembly according to one of claims 1 or 2, characterized in that an upper face (42) of the airflow separation device (40) has an angled profile, a first part ( 42a) of this upper face extending parallel to a lower edge (21a) of the upper vented door (21) and a second portion (42b) of this upper face (42) extending perpendicularly to said lower edge (21a) of the upper vented door (21), said lower edge (21a) including at least one air inlet (27) in the upper ventilated door (21).   4. Oven assembly according to one of claims 1 to 3, characterized in that a suction device (12) is associated with the lower baking oven and is adapted to suck air through a orifice (16) located near the upper edge (Ilb) of the lower ventilated door (11) and to evacuate air on the front of said oven.   5. Oven assembly according to claim 4, characterized in that the separating device (40) has a lower face (41) adapted to direct the flow of exhaust air substantially perpendicular to said lower ventilated door (11).   Oven assembly according to one of claims 1 to 5, characterized in that a second suction device (22) is associated with the upper cooking oven and is adapted to evacuate air in the vicinity of an upper edge (21b) of the upper vented door (21), said upper edge (21b) including at least one air outlet (26) of the upper vented door (21).   Baking furnace assembly according to one of claims 1 to 6, characterized in that the airflow separating device (40) extends over the entire width of the ventilated doors (11, 21) of the baking ovens stacked.   Cooking oven assembly according to one of claims 1 to 7, characterized in that the airflow separating device (40) is fixed to the front of the lower oven.   9. Assembly of cooking ovens according to one of claims 1 to 8, characterized in that it comprises a separating element (31) disposed at the rear of the cooking chambers (10, 20), adapted to 15 separating air flows displaced by a first suction device (12) associated with the lower cooking oven and by a second suction device (22) associated with the upper cooking oven.   Cooking oven assembly according to claim 9, characterized in that said separating element (31) is a plate pierced with apertures for the passage of control and feeding cables of the lower baking oven.