EP1580488B1 - Microwave oven with internal ventilation - Google Patents

Microwave oven with internal ventilation Download PDF

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Publication number
EP1580488B1
EP1580488B1 EP05004636A EP05004636A EP1580488B1 EP 1580488 B1 EP1580488 B1 EP 1580488B1 EP 05004636 A EP05004636 A EP 05004636A EP 05004636 A EP05004636 A EP 05004636A EP 1580488 B1 EP1580488 B1 EP 1580488B1
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EP
European Patent Office
Prior art keywords
technical area
oven
microwave oven
flow
built
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German (de)
French (fr)
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EP1580488A1 (en
Inventor
Delphine Merour
Vincent Gatto
Abdelaaziz Bouirdene
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FagorBrandt SAS
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FagorBrandt SAS
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/642—Cooling of the microwave components and related air circulation systems
    • 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
    • F24C15/006—Arrangements for circulation of cooling air
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6402—Aspects relating to the microwave cavity

Definitions

  • the present invention relates to a built-in microwave oven with internal ventilation comprising an outer enclosure intended to be inserted in a niche located in a kitchen unit.
  • the invention proposes to provide the internal ventilation of said enclosure, the areas to be ventilated in this chamber being of two types: the areas to be cooled on the one hand and the areas to be dried on the other hand.
  • the areas to be cooled are all electrical or electronic components which, by the Joules effect, give off heat.
  • the zones to be dried are those that are present inside the cooking cavity, namely, in particular, the door and the walls of this cavity on which the water vapor, emitted during the heating of the food by the microwaves. waves, tends to condense.
  • the known microwave ovens have, for many of them, at least one of these orifices located on a face other than the front face. This requires a recess providing a natural air circulation space and to bring the air inlets and outlets in the plane of the front of the oven or to provide a chimney on the back of the cabinet Recessed.
  • the request for US4332993 as for it describes a device that is positioned on the air inlet and outlet openings disposed on the top of the oven and which, by the presence of a turbine, ensures the entry and exit of air in the air. enclosure of said furnace.
  • microwave oven described in the document DE 31 04 677 A1 .
  • This document describes a microwave oven comprising a cooling device divided into at least two individual spaces, each of which has a separate air circulation.
  • this baking oven has the disadvantage of being provided with a cooling device with two hot and humid air outlet openings located at the upper part and at the rear of the oven so as to repress two streams of water. hot and humid air in a chimney formed in the niche housing the microwave oven.
  • the object of the invention is to provide a built-in microwave oven does not impose any constraint on the niche to receive it, it simply presenting the standard dimensions proposed by kitchen furniture manufacturers.
  • the invention thus facilitates the integration of said oven in a kitchen.
  • the invention proposes, moreover, to do it economically.
  • the air circuit inside the microwave oven is as follows: the air enters through the air inlet located in the upper zone of the front of the oven, above the door , it passes through a first technical area being sucked by the fan, before being divided into two streams at the output of the fan.
  • the first flow passes through a second technical zone then will dry the door, then the inside of the cooking cavity, before joining a fourth technical zone.
  • the second flow goes through a third technical zone before joining the fourth technical zone.
  • the two flows meet in the technical area before leaving the oven through the openings positioned in the lower part of the front of the oven, below the door.
  • this zone between the air intake and the fan, is slightly depressed and bathed by fresh air from the atmosphere of the room.
  • the magnetron placed, according to a preferred feature of the invention, in the second technical zone, cools by heating the flow that passes through it before being introduced into the cooking cavity, allowing this heated air to increase its temperature. drying capacity of the cooking cavity and heating the door and walls of said cavity to prevent condensation.
  • the supply of the magnetron ideally placed in a third technical zone and preferably in the lowest part of this zone, is cooled by the third flow, while being advantageously positioned in the lower part of the furnace. This positioning in the lower part facilitates the design of the device, said power supply being a high mass member and therefore constraining the structure.
  • the water vapor that escapes from heated food and has a natural tendency to rise once it is no longer in an imposed circuit comes out in the lower part. from the oven.
  • it has time to dilute in the air before risking to be deposited on the cabinet wall located immediately above the oven. This preserves the aesthetic and functional qualities of the piece of furniture.
  • the outlet of the first flow which has passed through the cooking cavity is effected in the upper part thereof. This flow then descends through a fifth technical area located between the side walls of the chamber and the cavity before finding the second stream in the fourth technical area. This gives it time to cool down before being expelled outside the oven.
  • FIG. 1 there is shown a perspective view of a microwave oven according to the invention. This view makes it possible, in particular, to clearly visualize the various components that will intervene in the description that follows. Of course, many components such as those involved in driving the tray of the oven or its lighting are not represented or described here because they do not differ from devices well known to those skilled in the art and present on current ovens.
  • the figures 1 and 2 allow to illustrate the air circulation in the technical zone 4a.
  • the air enters the zone 4a through the openings 5 located on the front of the oven, between the front door 3 and the control panel 8. It cools the electronic components 7 which are located behind the control panel and / or in other locations within said area 4a. Then it enters one of the two turbines 11b or 11c of the fan, said turbines both being rotated by the motor 11a.
  • the technical zone 4a is in depression due to the suction provided by the fan 11.
  • the fan 11 is formed of a motor 11a and two turbines 11b and 11c is very advantageous economically. However, it may be envisaged to replace it with two fans with a single turbine without departing from the scope of the invention.
  • the figures 1 and 3 illustrate the flow of air in Technical Zone 4b.
  • the technical zone 4b is formed of a first air guide 12, the magnetron 9 and a second air guide 13.
  • This technical zone 4b is bathed by the flow b from the turbine 11b .
  • the first air guide 12 directs the flow under pressure towards the magnetron 9.
  • the air is at a temperature within a range of 35 to 55 ° C. and preferably 45 ° C.
  • Said magnetron 9 is crossed and thereby cooled by the flow b.
  • the flow b is then directed towards the front of the oven thanks to the air guide 13 which communicates with the cooking cavity 2 through inlet openings (not shown) in the sheet forming the upper wall of the cooking cavity 2 , said inlet openings being located just above the door 3.
  • the stream b has warmed through the magnetron 9, it has gained about 40 ° C, then in a temperature range between 75 and 95 ° C, it has thus, interestingly, increased its ability to heat and dry the interior of the door 3 and the elements of the cooking cavity 2 in order to avoid condensation.
  • the figures 1 and 4 allow to illustrate the air circulation in the technical zone 4c.
  • the turbine 11c directly blows the flow c on the supply 10 of the magnetron 9, which is one of the elements present in the technical zone 4c, in order to cool it, in compliance with the standards in force, while ensuring good aptitude for the function.
  • Other components may be present in this technical area 4c, but they are not directly concerned by this invention and have therefore not been represented.
  • the supply 10 of the magnetron 9 is in the lower part of the technical zone 4c and therefore in the lower part of the furnace. This position is particularly interesting for economic reasons. Indeed, in this position, the power supply 10 of the magnetron 9 is directly fixed on the bottom of the oven and it is not necessary to provide a reinforced area to receive it, as may be necessary if said power supply. 10 of the magnetron 9 was placed in height.
  • the technical zone 4c is separated from the technical zones 4d and 4e by a perforated wall 14 whose main role is to maintain the cavity 2 in position.
  • the number and the position of the openings 15 present in this wall can be modulated, without departing from the scope of the invention, provided that at least one opening 15 is provided for the flow c to join the technical zone 4 e , either directly, via technical area 4d.
  • the figures 1 and 5 illustrate the air circulation in zone 4d.
  • the flow b comes out of the cooking cavity 2 through outlet openings (not shown) located in the upper part of the cooking cavity 2, said outlet openings being on the upper wall of the cooking cavity 2, or in the upper part of the vertical walls of the cooking cavity 2.
  • the stream b is guided to the technical area 4d which is located on one side of the oven, or preferably on both sides thereof.
  • the stream b then joins the bottom of the furnace to the technical zone 4e.
  • the figures 1 and 6 allow to illustrate the air circulation in zone 4e.
  • the streams b and c meet in the technical zone 4e before leaving the oven through the openings 6 positioned in the lower part of the front facade of the oven, below the door 3.
  • the power supply 10 of the magnetron 9 is a high voltage transformer. It is equally conceivable whether it is a switching power supply or "inverter".
  • the air inlet 5 is located, still in the upper part of the front of the oven, but above the control strip 8 or it is separated into several openings around the control panel 8.
  • an oven according to the invention makes it possible to preserve the furniture present around said oven. Indeed, the moist air rejected at the outlet of air 6 will not go directly to lick the furniture located above the recess of the oven. It will have time to dilute and therefore have a lower moisture content before coming into contact with colder surfaces and likely to fear moisture.
  • the fan 11 being relatively far from the air outlet 6, the speed of the air leaving the oven is not very high and thus reduces the risk of discomfort for the user standing in front of the oven.
  • the user feels less air flow than if the fan was in the immediate vicinity of the outlet.
  • the air output is at a temperature substantially lower than that which is generally found at the output of this type of chamber. 'apparatus.
  • the air expelled from the furnace according to the invention has a temperature in the range between 35 and 55 ° C and ideally close to 45 ° C.
  • the characteristics described above are those of a microwave oven using this single cooking means, but the invention can also be applied to an oven having, in addition to the microwave cooking mode, other modes of cooking. cooking that can work alone or in combination, such as a grill mode (direct heating thanks to a shielded resistor, a quartz or a halogen) or a rotating heat mode (injection into the cavity, thanks to a fan, heated air using an armored resistor).
  • a grill mode direct heating thanks to a shielded resistor, a quartz or a halogen
  • a rotating heat mode injection into the cavity, thanks to a fan, heated air using an armored resistor.
  • the invention responds to the need to provide internal ventilation of a built-in microwave oven, in a simple, effective and economical way and allowing embedding in any integrated kitchen niche having standard dimensions without imposing on it in said niche of specific areas to ensure the flow of air and that in the best respect of the surrounding furniture and comfort of the user.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

The ventilation has openings (5) situated in an upper zone at a front side of a microwave oven, above a door that closes a cooking cavity (2), where air enters via the openings (5) and traverses a technical zone by a ventilator (11). Two turbines of the ventilator divide the air flow into two flows that traverse respective technical zones before joining at a specific zone and are expelled via openings (6) at a lower zone of the oven.

Description

La présente invention se rapporte à un four à micro-ondes encastré avec une ventilation interne comprenant une enceinte extérieure destinée à être insérée dans une niche située dans un meuble de cuisine.The present invention relates to a built-in microwave oven with internal ventilation comprising an outer enclosure intended to be inserted in a niche located in a kitchen unit.

Plus précisément, l'invention se propose de réaliser la ventilation interne de ladite enceinte, les zones à ventiler dans cette enceinte étant de deux types : les zones devant être refroidies d'une part et les zones devant être asséchées d'autre part. Les zones à refroidir sont tous les composants électriques ou électroniques qui, par effet Joules, dégagent de la chaleur. Les zones à assécher sont celles qui sont présentes à l'intérieur de la cavité de cuisson, soit, en particulier, la porte et les parois de cette cavité sur lesquelles la vapeur d'eau, émise lors du chauffage des aliments par les micro-ondes, tend à se condenser.More specifically, the invention proposes to provide the internal ventilation of said enclosure, the areas to be ventilated in this chamber being of two types: the areas to be cooled on the one hand and the areas to be dried on the other hand. The areas to be cooled are all electrical or electronic components which, by the Joules effect, give off heat. The zones to be dried are those that are present inside the cooking cavity, namely, in particular, the door and the walls of this cavity on which the water vapor, emitted during the heating of the food by the microwaves. waves, tends to condense.

Il faut donc prévoir une circulation d'air à l'intérieur du four, ainsi que, bien sûr, des orifices d'entrée et de sortie de cet air.It is therefore necessary to provide a circulation of air inside the oven, as well as, of course, the inlet and outlet orifices of this air.

Les fours à micro-ondes connus ont, pour beaucoup d'entre eux, au moins un de ces orifices situé sur une face autre que la face avant. Cela demande de procéder à un encastrement ménageant un espace de circulation naturelle de l'air et permettant de ramener les entrées et sorties d'air dans le plan de la façade avant du four ou encore, de prévoir une cheminée sur l'arrière du meuble d'encastrement. La demande de brevet US4332993 quant à elle décrit un dispositif qui se positionne sur les orifices d'entrée et sortie d'air disposés sur le dessus du four et qui, par la présence d'une turbine, assure l'entrée et la sortie de l'air dans l'enceinte dudit four.The known microwave ovens have, for many of them, at least one of these orifices located on a face other than the front face. This requires a recess providing a natural air circulation space and to bring the air inlets and outlets in the plane of the front of the oven or to provide a chimney on the back of the cabinet Recessed. The request for US4332993 as for it describes a device that is positioned on the air inlet and outlet openings disposed on the top of the oven and which, by the presence of a turbine, ensures the entry and exit of air in the air. enclosure of said furnace.

De tels systèmes présentent tous la contrainte suivante : il faut prévoir une niche d'encastrement de dimensions supérieures aux dimensions hors tout de l'appareil.Such systems all have the following constraint: it is necessary to provide a recess of dimensions larger than the overall dimensions of the device.

Une contrainte courante de ces dispositifs, en particulier si l'on veut une niche aux dimensions les plus faibles possibles, est la nécessaire présence d'une cheminée de ventilation dans le meuble de cuisine.A common constraint of these devices, particularly if one wants a niche with the smallest possible dimensions, is the need for a ventilation chimney in the kitchen furniture.

On connaît également un four de cuisson à micro-ondes décrit dans le document DE 31 04 677 A1 . Ce document décrit un four de cuisson à micro-ondes comprenant un dispositif de refroidissement divisé en au moins deux espaces individuels, dont chacun de ces espaces a une circulation d'air séparé.Also known is a microwave oven described in the document DE 31 04 677 A1 . This document describes a microwave oven comprising a cooling device divided into at least two individual spaces, each of which has a separate air circulation.

Cependant, ce four de cuisson présente l'inconvénient d'être pourvu d'un dispositif de refroidissement a deux ouvertures d'évacuation d'air chaud et humide situées en partie supérieure et à l'arrière du four de sorte à refouler deux flux d'air chaud et humide dans une cheminée formée dans la niche logeant le four de cuisson à micro-ondes.However, this baking oven has the disadvantage of being provided with a cooling device with two hot and humid air outlet openings located at the upper part and at the rear of the oven so as to repress two streams of water. hot and humid air in a chimney formed in the niche housing the microwave oven.

Le but de l'invention est de proposer un four à micro-ondes encastrable n'imposant aucune contrainte concernant la niche destinée à le recevoir, celle-ci présentant simplement les dimensions standard proposées par les fabricants de mobilier de cuisine. L'invention facilite ainsi l'intégration dudit four dans une cuisine. L'invention se propose, de plus, de le faire de façon économique.The object of the invention is to provide a built-in microwave oven does not impose any constraint on the niche to receive it, it simply presenting the standard dimensions proposed by kitchen furniture manufacturers. The invention thus facilitates the integration of said oven in a kitchen. The invention proposes, moreover, to do it economically.

Selon l'invention, le circuit d'air à l'intérieur du four à micro-ondes est le suivant : l'air entre par l'entrée d'air située en zone supérieure de la façade du four, au dessus de la porte, il traverse une première zone technique en étant aspiré par le ventilateur, avant d'être divisé en deux flux à la sortie du ventilateur. Le premier flux traverse une seconde zone technique puis va assécher la porte, puis l'intérieur de la cavité de cuisson, avant de rejoindre une quatrième zone technique. Le second flux traverse une troisième zone technique avant de rejoindre la quatrième zone technique. Les deux flux se rejoignent dans la zone technique avant de sortir du four par les ouvertures positionnées en partie inférieure de la façade avant du four, en dessous de la porte.According to the invention, the air circuit inside the microwave oven is as follows: the air enters through the air inlet located in the upper zone of the front of the oven, above the door , it passes through a first technical area being sucked by the fan, before being divided into two streams at the output of the fan. The first flow passes through a second technical zone then will dry the door, then the inside of the cooking cavity, before joining a fourth technical zone. The second flow goes through a third technical zone before joining the fourth technical zone. The two flows meet in the technical area before leaving the oven through the openings positioned in the lower part of the front of the oven, below the door.

Ainsi la ventilation de l'ensemble de l'intérieur du four est assurée.Thus the ventilation of the entire interior of the oven is ensured.

On distingue une première zone technique, où est placée l'électronique de commande et, idéalement, l'électronique de puissance. Selon l'invention, cette zone, comprise entre l'entrée d'air et le ventilateur, est en légère dépression et baignée par l'air frais arrivant de l'ambiance de la pièce.There is a first technical area, where is placed the control electronics and, ideally, the power electronics. According to the invention, this zone, between the air intake and the fan, is slightly depressed and bathed by fresh air from the atmosphere of the room.

Le magnétron, placé, selon une caractéristique préférée de l'invention, dans la seconde zone technique, se refroidit en réchauffant le flux qui le traverse avant d'être introduit dans la cavité de cuisson, permettant à cet air réchauffé d'augmenter sa capacité d'assèchement de la cavité de cuisson et de réchauffer la porte et les parois de ladite cavité afin d'éviter la condensation.The magnetron, placed, according to a preferred feature of the invention, in the second technical zone, cools by heating the flow that passes through it before being introduced into the cooking cavity, allowing this heated air to increase its temperature. drying capacity of the cooking cavity and heating the door and walls of said cavity to prevent condensation.

Enfin, l'alimentation du magnétron, idéalement placée dans une troisième zone technique et de façon préférentielle dans la partie la plus basse de cette zone, est refroidie par le troisième flux, tout en étant avantageusement positionnée en partie inférieure du four. Ce positionnement en partie basse facilite la conception de l'appareil, ladite alimentation étant un organe de masse élevée et donc contraignante pour la structure.Finally, the supply of the magnetron, ideally placed in a third technical zone and preferably in the lowest part of this zone, is cooled by the third flow, while being advantageously positioned in the lower part of the furnace. This positioning in the lower part facilitates the design of the device, said power supply being a high mass member and therefore constraining the structure.

En outre, une conséquence intéressante de ce dispositif est qu'elle permet de se servir d'un ventilateur économique comprenant un seul moteur entraînant deux turbines.In addition, an interesting consequence of this device is that it allows to use an economical fan comprising a single motor driving two turbines.

Suivant une caractéristique particulièrement intéressante de l'invention, la vapeur d'eau qui s'échappe des aliments chauffés et qui a une tendance naturelle à s'élever une fois qu'elle n'est plus dans un circuit imposé, sort en partie inférieure du four. Ainsi elle a le temps de se diluer dans l'air avant de risquer de se déposer sur la paroi du meuble situé immédiatement au dessus du four. Cela permet de préserver les qualités esthétiques et fonctionnelles dudit meuble.According to a particularly advantageous characteristic of the invention, the water vapor that escapes from heated food and has a natural tendency to rise once it is no longer in an imposed circuit, comes out in the lower part. from the oven. Thus it has time to dilute in the air before risking to be deposited on the cabinet wall located immediately above the oven. This preserves the aesthetic and functional qualities of the piece of furniture.

Dans un mode de réalisation préféré de l'invention, la sortie du premier flux qui a traversé de la cavité de cuisson s'effectue dans la partie supérieure de celle-ci. Ce flux descend alors par une cinquième zone technique située entre les parois latérales de l'enceinte et de la cavité avant de retrouver le second flux dans la quatrième zone technique. Cela lui donne le temps de se refroidir avant d'être expulsé à l'extérieur du four.In a preferred embodiment of the invention, the outlet of the first flow which has passed through the cooking cavity is effected in the upper part thereof. This flow then descends through a fifth technical area located between the side walls of the chamber and the cavity before finding the second stream in the fourth technical area. This gives it time to cool down before being expelled outside the oven.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui va suivre, donnée à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels :

  • La figure 1 est une vue en perspective d'un four à micro-ondes selon l'invention ;
  • La figure 2 est une vue similaire à celle de la figure 1 et illustre plus spécialement la zone 4a et la façon dont l'air circule dans ladite zone ;
  • La figure 3 est une vue similaire à celle de la figure 1 et illustre plus spécialement la zone 4b et la façon dont l'air circule dans ladite zone ;
  • La figure 4 est une vue similaire à celle de la figure 1 et illustre plus spécialement la zone 4c et la façon dont l'air circule dans ladite zone ;
  • La figure 5 est une vue similaire à celle de la figure 1 et illustre plus spécialement la zone 4d et la façon dont l'air circule dans ladite zone ; et
  • La figure 6 est une vue similaire à celle de la figure 1 et illustre plus spécialement la zone 4e et la façon dont l'air circule dans ladite zone.
Other features and advantages of the invention will emerge from the following description, given by way of non-limiting example, with reference to the accompanying drawings in which:
  • The figure 1 is a perspective view of a microwave oven according to the invention;
  • The figure 2 is a view similar to that of the figure 1 and more particularly illustrates the zone 4a and the manner in which the air circulates in said zone;
  • The figure 3 is a view similar to that of the figure 1 and more particularly illustrates zone 4b and the manner in which air circulates in said zone;
  • The figure 4 is a view similar to that of the figure 1 and more particularly illustrates the zone 4c and the manner in which the air circulates in said zone;
  • The figure 5 is a view similar to that of the figure 1 and more particularly illustrates the zone 4d and the manner in which the air circulates in said zone; and
  • The figure 6 is a view similar to that of the figure 1 and more particularly illustrates the zone 4e and the way the air circulates in said zone.

A la figure 1 on a représenté une vue en perspective d'un four à micro-ondes selon l'invention. Cette vue permet, en particulier, de bien visualiser les différents composants qui interviendront dans la description qui va suivre. Bien entendu, de nombreux composants tels que ceux participant à l'entraînement du plateau du four ou encore à son éclairage ne sont pas représentés ni décrits ici car ils ne différent pas des dispositifs bien connus de l'homme de l'art et présents sur les fours actuels.To the figure 1 there is shown a perspective view of a microwave oven according to the invention. This view makes it possible, in particular, to clearly visualize the various components that will intervene in the description that follows. Of course, many components such as those involved in driving the tray of the oven or its lighting are not represented or described here because they do not differ from devices well known to those skilled in the art and present on current ovens.

Les figures 1 et 2 permettent d'illustrer la circulation d'air dans la zone technique 4a.The figures 1 and 2 allow to illustrate the air circulation in the technical zone 4a.

Selon l'invention, grâce à l'aspiration du ventilateur 11, l'air pénètre dans la zone 4a par les ouvertures 5 situées en face avant du four, entre la porte avant 3 et le bandeau de commande 8. Il refroidit les composants électroniques 7 qui sont situés derrière le bandeau de commande et/ou en d'autres emplacements à l'intérieur de ladite zone 4a. Puis il pénètre dans l'une des deux turbines 11b ou 11c du ventilateur, lesdites turbines étant toutes deux entraînées en rotation par le moteur 11a.According to the invention, by the suction of the fan 11, the air enters the zone 4a through the openings 5 located on the front of the oven, between the front door 3 and the control panel 8. It cools the electronic components 7 which are located behind the control panel and / or in other locations within said area 4a. Then it enters one of the two turbines 11b or 11c of the fan, said turbines both being rotated by the motor 11a.

Ainsi, selon l'invention, la zone technique 4a est en dépression grâce à l'aspiration fournie par le ventilateur 11.Thus, according to the invention, the technical zone 4a is in depression due to the suction provided by the fan 11.

Le fait que le ventilateur 11 soit formé d'un moteur 11a et de deux turbines 11b et 11c est très avantageux sur un plan économique. Cependant il peut être envisagé de le remplacer par deux ventilateurs à une seule turbine sans sortir du cadre de l'invention.The fact that the fan 11 is formed of a motor 11a and two turbines 11b and 11c is very advantageous economically. However, it may be envisaged to replace it with two fans with a single turbine without departing from the scope of the invention.

Les figures 1 et 3 permettent d'illustrer la circulation d'air dans la zone technique 4b.The figures 1 and 3 illustrate the flow of air in Technical Zone 4b.

Selon l'invention, la zone technique 4b est formée d'un premier guide d'air 12, du magnétron 9 et d'un second guide d'air 13. Cette zone technique 4b est baignée par le flux b issu de la turbine 11b. Le premier guide d'air 12 dirige le flux en surpression vers le magnétron 9. A titre indicatif, à l'intérieur du guide d'air 12, l'air se trouve à une température comprise dans une fourchette de 35 à 55°C et de façon préférée égale à 45°C. Ledit magnétron 9 est traversé et de ce fait refroidi par le flux b. Le flux b est ensuite dirigé vers l'avant du four grâce au guide d'air 13 qui communique avec la cavité de cuisson 2 par des ouvertures d'entrée (non représentées) dans la tôle formant la paroi supérieure de la cavité de cuisson 2, lesdites ouvertures d'entrée étant situées juste au dessus de la porte 3. Le flux b s'étant réchauffé en traversant le magnétron 9, il a gagné environ 40 °C, se trouvant alors dans une fourchette de température comprise entre 75 et 95°C, il a ainsi, de façon intéressante, augmenté sa capacité de réchauffement et d'assèchement de l'intérieur de la porte 3 et des éléments de la cavité de cuisson 2 afin d'y éviter la condensation.According to the invention, the technical zone 4b is formed of a first air guide 12, the magnetron 9 and a second air guide 13. This technical zone 4b is bathed by the flow b from the turbine 11b . The first air guide 12 directs the flow under pressure towards the magnetron 9. As an indication, inside the air guide 12, the air is at a temperature within a range of 35 to 55 ° C. and preferably 45 ° C. Said magnetron 9 is crossed and thereby cooled by the flow b. The flow b is then directed towards the front of the oven thanks to the air guide 13 which communicates with the cooking cavity 2 through inlet openings (not shown) in the sheet forming the upper wall of the cooking cavity 2 , said inlet openings being located just above the door 3. The stream b has warmed through the magnetron 9, it has gained about 40 ° C, then in a temperature range between 75 and 95 ° C, it has thus, interestingly, increased its ability to heat and dry the interior of the door 3 and the elements of the cooking cavity 2 in order to avoid condensation.

Les figures 1 et 4 permettent d'illustrer la circulation d'air dans la zone technique 4c.The figures 1 and 4 allow to illustrate the air circulation in the technical zone 4c.

Selon l'invention, la turbine 11c souffle directement le flux c sur l'alimentation 10 du magnétron 9, qui est un des éléments présents dans la zone technique 4c, afin de la refroidir, dans le respect des normes en vigueur, tout en assurant une bonne aptitude à la fonction. D'autres composants peuvent être présents dans cette zone technique 4c, mais ils ne sont pas directement concernés par cette invention et n'ont de ce fait pas été représentés.According to the invention, the turbine 11c directly blows the flow c on the supply 10 of the magnetron 9, which is one of the elements present in the technical zone 4c, in order to cool it, in compliance with the standards in force, while ensuring good aptitude for the function. Other components may be present in this technical area 4c, but they are not directly concerned by this invention and have therefore not been represented.

Selon une caractéristique préférée de l'invention, l'alimentation 10 du magnétron 9 se trouve dans la partie basse de la zone technique 4c et donc dans la partie basse du four. Cette position est particulièrement intéressant pour des raisons économiques. En effet, dans cette position, l'alimentation 10 du magnétron 9 est directement fixée sur le fond du four et il n'est pas nécessaire de prévoir une zone renforcée pour l'accueillir, ainsi que cela pourrait être nécessaire si ladite l'alimentation 10 du magnétron 9 était placée en hauteur.According to a preferred characteristic of the invention, the supply 10 of the magnetron 9 is in the lower part of the technical zone 4c and therefore in the lower part of the furnace. This position is particularly interesting for economic reasons. Indeed, in this position, the power supply 10 of the magnetron 9 is directly fixed on the bottom of the oven and it is not necessary to provide a reinforced area to receive it, as may be necessary if said power supply. 10 of the magnetron 9 was placed in height.

La zone technique 4c est séparée des zones techniques 4d et 4e par une paroi ajourée 14 dont le rôle principal est de maintenir la cavité 2 en position. Le nombre et la position des ouvertures 15 présentes dans cette paroi peuvent être modulés, sans sortir du cadre de l'invention, du moment qu'il est ménagé au moins une ouverture 15 permettant au flux c de rejoindre la zone technique 4e, soit directement, soit en passant par la zone technique 4d.The technical zone 4c is separated from the technical zones 4d and 4e by a perforated wall 14 whose main role is to maintain the cavity 2 in position. The number and the position of the openings 15 present in this wall can be modulated, without departing from the scope of the invention, provided that at least one opening 15 is provided for the flow c to join the technical zone 4 e , either directly, via technical area 4d.

Les figures 1 et 5 permettent d'illustrer la circulation d'air dans la zone 4d.The figures 1 and 5 illustrate the air circulation in zone 4d.

Dans un mode préféré de réalisation de l'invention, le flux b ressort de la cavité de cuisson 2 par des ouvertures de sortie (non représentées) situées dans la partie supérieure de la cavité de cuisson 2, lesdites ouvertures de sortie pouvant se trouver sur la paroi supérieure de la cavité de cuisson 2, ou dans la partie supérieure des parois verticales de la cavité de cuisson 2.In a preferred embodiment of the invention, the flow b comes out of the cooking cavity 2 through outlet openings (not shown) located in the upper part of the cooking cavity 2, said outlet openings being on the upper wall of the cooking cavity 2, or in the upper part of the vertical walls of the cooking cavity 2.

Une fois sorti de la cavité de cuisson 2, le flux b est guidé vers la zone technique 4d qui est située sur un des côtés du four, ou de façon préférée, des deux côtés de celui-ci.Once out of the cooking cavity 2, the stream b is guided to the technical area 4d which is located on one side of the oven, or preferably on both sides thereof.

Selon l'invention, le flux b rejoint ensuite le dessous du four vers la zone technique 4e.According to the invention, the stream b then joins the bottom of the furnace to the technical zone 4e.

Les figures 1 et 6 permettent d'illustrer la circulation d'air dans la zone 4e.The figures 1 and 6 allow to illustrate the air circulation in zone 4e.

Selon l'invention, les flux b et c se rejoignent dans la zone technique 4e avant de sortir du four par les ouvertures 6 positionnées en partie inférieure de la façade avant du four, en dessous de la porte 3.According to the invention, the streams b and c meet in the technical zone 4e before leaving the oven through the openings 6 positioned in the lower part of the front facade of the oven, below the door 3.

Il est envisageable, sans sortir du cadre de l'invention, en fonction du nombre et de la disposition des ouvertures 15 ainsi que des rapports des pressions des flux b et c, que le mélange des flux b et c commence dans les zones limitrophes entre les zones techniques 4c et 4d. Cela ne nuit en rien à l'efficacité de la ventilation réalisée. En effet, une fois dans la zone technique 4d, le flux b n'a plus d'utilité et sa température peut-être quelconque. Quant au flux c, il est soufflé directement sur l'alimentation 10 du magnétron 9 et crée un mouvement d'air à la proximité immédiate de l'alimentation 10 du magnétron 9, empêchant l'arrivée de flux parasites dont la température pourrait être supérieure à celle dudit flux c. Les conditions de bon fonctionnement ne sont donc pas altérées par la possible non maîtrise de la zone de mélange des flux b et c.It is conceivable, without departing from the scope of the invention, as a function of the number and arrangement of the openings 15 as well as the ratios of the pressures of the streams b and c, that the mixing of the streams b and c starts in the boundary zones between technical areas 4c and 4d. This does not affect the efficiency of the ventilation performed. Indeed, once in the technical area 4d, the stream b is no longer useful and its temperature may be any. As for the flow c, it is blown directly on the supply 10 of the magnetron 9 and creates a movement of air in the immediate vicinity of the supply 10 of the magnetron 9, preventing the arrival of parasitic flows whose temperature could be higher that of said stream c. The conditions of good operation are therefore not affected by the possible non-control of the mixing zone of flows b and c.

Il est tout aussi envisageable, sans sortir du cadre de l'invention, que les flux b et c soient entièrement canalisés vers des ouvertures de sortie 6 dédiées à chaque flux, et que, de ce fait ils ne se mélangent pas à l'intérieur de l'enceinte 1 du four.It is also conceivable, without departing from the scope of the invention, that the streams b and c are fully channeled to outlet openings 6 dedicated to each flow, and that, therefore, they do not mix inside. of the enclosure 1 of the oven.

Selon un mode de réalisation de l'invention, l'alimentation 10 du magnétron 9 est un transformateur haute tension. Il est tout aussi envisageable que ce soit une alimentation à découpage ou « inverter ».According to one embodiment of the invention, the power supply 10 of the magnetron 9 is a high voltage transformer. It is equally conceivable whether it is a switching power supply or "inverter".

De la même façon, il est aussi envisageable dans un autre mode de réalisation de l'invention que l'entrée d'air 5 se situe, toujours en partie supérieure de la façade du four, mais au dessus du bandeau 8 de commande ou encore qu'elle soit séparée en plusieurs ouvertures situées autour du bandeau de commande 8.In the same way, it is also conceivable in another embodiment of the invention that the air inlet 5 is located, still in the upper part of the front of the oven, but above the control strip 8 or it is separated into several openings around the control panel 8.

Une conséquence intéressante est qu'un four selon l'invention permet de préserver le mobilier présent autour dudit four. En effet, l'air humide rejeté au niveau de la sortie d'air 6 ne va pas aller directement lécher le meuble situé au dessus de la niche d'encastrement du four. Il va avoir le temps de se diluer et donc de présenter un taux d'humidité plus faible avant d'entrer en contact avec des surfaces plus froides et susceptibles de craindre l'humidité.An interesting consequence is that an oven according to the invention makes it possible to preserve the furniture present around said oven. Indeed, the moist air rejected at the outlet of air 6 will not go directly to lick the furniture located above the recess of the oven. It will have time to dilute and therefore have a lower moisture content before coming into contact with colder surfaces and likely to fear moisture.

Une autre conséquence intéressante de l'invention est que le ventilateur 11 se trouvant relativement éloigné de la sortie d'air 6, la vitesse de l'air sortant du four n'est pas très élevée et de ce fait limite les risques d'inconfort pour l'utilisateur se tenant devant le four. L'utilisateur ressent un courant d'air moins fort que si le ventilateur se trouvait à proximité immédiate de la sortie. De plus, toujours grâce à la relativement grande distance que parcourent les flux à l'intérieur de l'enceinte 1, l'air en sortie est à une température sensiblement inférieure à celle que l'on trouve en général en sortie de ce type d'appareil. L'air expulsé du four selon l'invention a une température se situant dans une fourchette entre 35 et 55°C et idéalement proche de 45°C.Another interesting consequence of the invention is that the fan 11 being relatively far from the air outlet 6, the speed of the air leaving the oven is not very high and thus reduces the risk of discomfort for the user standing in front of the oven. The user feels less air flow than if the fan was in the immediate vicinity of the outlet. Moreover, still thanks to the relatively large distance traveled by the flows inside the chamber 1, the air output is at a temperature substantially lower than that which is generally found at the output of this type of chamber. 'apparatus. The air expelled from the furnace according to the invention has a temperature in the range between 35 and 55 ° C and ideally close to 45 ° C.

Les caractéristiques précédemment décrites sont celles d'un four à micro-ondes utilisant ce seul moyen de cuisson, mais l'invention peut aussi être appliquée à un four présentant, en plus du mode de cuisson par micro-ondes, d'autres modes de cuisson pouvant fonctionner seuls ou en combinaison, tels qu'un mode grill (chauffage direct grâce à une résistance blindée, un quartz ou un halogène) ou un mode chaleur tournante (injection dans la cavité, grâce à un ventilateur, de l'air chauffé à l'aide d'une résistance blindée).The characteristics described above are those of a microwave oven using this single cooking means, but the invention can also be applied to an oven having, in addition to the microwave cooking mode, other modes of cooking. cooking that can work alone or in combination, such as a grill mode (direct heating thanks to a shielded resistor, a quartz or a halogen) or a rotating heat mode (injection into the cavity, thanks to a fan, heated air using an armored resistor).

L'invention répond au souci de réaliser une ventilation interne d'un four à micro-ondes encastré, de façon simple, efficace et économique et en permettant l'encastrement dans n'importe quelle niche de cuisine intégrée présentant des dimensions standard sans lui imposer dans ladite niche de zones spécifiques pour assurer la circulation de l'air et cela dans le meilleur respect du mobilier environnant et du confort de l'utilisateur.The invention responds to the need to provide internal ventilation of a built-in microwave oven, in a simple, effective and economical way and allowing embedding in any integrated kitchen niche having standard dimensions without imposing on it in said niche of specific areas to ensure the flow of air and that in the best respect of the surrounding furniture and comfort of the user.

Claims (9)

  1. Built-in microwave oven with internal ventilation, comprising a chamber (1), a cooking cavity (2) enclosed by a door (3), an air inlet (5), an air outlet (6), a fan (11), a technical area (4a) comprising at least one electronic board (7), a technical area (4b) comprising a magnetron (9), a technical area (4c) comprising a power supply (10) for the magnetron (9) and a technical area (4e) located upstream of the air outlet (6),
    the air circuit inside said oven being as follows:
    a) the air enters through the air inlet (5) located in the upper area of the front face of the oven, above the door (3),
    b) it is sucked through the technical area (4a) by the fan (11),
    c) it is divided into two flows at the output of the fan (11), flow b and flow c,
    d) flow b crosses the technical area (4b), then goes to dry the door (3), then the inside of the cooking cavity (2), before joining the technical area (4e),
    e) flow c crosses the technical area (4c) before joining the technical area (4e),
    characterized in that
    f) flows b and c converge in the technical area (4e) before exiting the oven through the openings (6) positioned in the lower part of the front face of the oven, beneath the door (3).
  2. Built-in microwave oven with internal ventilation according to claim 1,
    characterized in that while crossing the technical area (4b), flow b is heated by cooling the magnetron (9) before entering the cooking cavity (2).
  3. Built-in microwave oven with internal ventilation according to any of the previous claims,
    characterized in that flow c cools the power supply (10) of the magnetron (9) located at the bottom of the technical area (4c).
  4. Built-in microwave oven with internal ventilation according to any of the previous claims,
    characterized in that the fan (11) comprises a single engine (11a) driving two turbines (11b) and (11c), respectively blowing flux b in technical area (4b) and flow c in technical area (4c).
  5. Built-in microwave oven with internal ventilation according to any of the previous claims,
    characterized in that flow b exits the cooking cavity (2) through an opening located in the upper part of said cavity and joins the technical area (4e) by crossing the technical area (4d).
  6. Built-in microwave oven with internal ventilation according to any of the previous claims,
    characterized in that flows b and c converge in the technical area (4e) before being expelled from said technical area through the air outlet (6) located in the lower area of the oven, beneath the door (3).
  7. Built-in microwave oven with internal ventilation according to any of the previous claims,
    characterized in that the power supply (10) of the magnetron (9) is a transformer.
  8. Built-in microwave oven with internal ventilation according to any of the previous claims,
    characterized in that the power supply (10) of the magnetron (9) is a switching or "inverter" power supply.
  9. Built-in microwave oven with internal ventilation according to any of the previous claims,
    characterized in that the cooking cavity (2) comprises additional means of heating such as a grill or a rotating heat cooking device.
EP05004636A 2004-03-25 2005-03-03 Microwave oven with internal ventilation Active EP1580488B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0403063 2004-03-25
FR0403063A FR2868151B1 (en) 2004-03-25 2004-03-25 INTERNAL VENTILATION OF A MICROWAVE OVEN

Publications (2)

Publication Number Publication Date
EP1580488A1 EP1580488A1 (en) 2005-09-28
EP1580488B1 true EP1580488B1 (en) 2009-06-17

Family

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Application Number Title Priority Date Filing Date
EP05004636A Active EP1580488B1 (en) 2004-03-25 2005-03-03 Microwave oven with internal ventilation

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EP (1) EP1580488B1 (en)
AT (1) ATE434155T1 (en)
DE (1) DE602005014897D1 (en)
ES (1) ES2325403T3 (en)
FR (1) FR2868151B1 (en)

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US11596033B2 (en) 2020-06-09 2023-02-28 Whirlpool Corporation Condensation-managing hand-protecting cavity ventilation system

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KR100901890B1 (en) 2006-09-12 2009-06-10 엘지전자 주식회사 Cooking apparatus
KR20080024025A (en) 2006-09-12 2008-03-17 엘지전자 주식회사 Cooking apparatus
KR102211731B1 (en) 2014-07-23 2021-02-03 삼성전자주식회사 Oven

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Also Published As

Publication number Publication date
ES2325403T3 (en) 2009-09-03
ATE434155T1 (en) 2009-07-15
DE602005014897D1 (en) 2009-07-30
FR2868151B1 (en) 2006-05-05
FR2868151A1 (en) 2005-09-30
EP1580488A1 (en) 2005-09-28

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