EP2657615A1 - Appareil de cuisson et dispositif de catalyseur - Google Patents

Appareil de cuisson et dispositif de catalyseur Download PDF

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Publication number
EP2657615A1
EP2657615A1 EP12401070.3A EP12401070A EP2657615A1 EP 2657615 A1 EP2657615 A1 EP 2657615A1 EP 12401070 A EP12401070 A EP 12401070A EP 2657615 A1 EP2657615 A1 EP 2657615A1
Authority
EP
European Patent Office
Prior art keywords
catalyst device
porous body
cooking appliance
active material
partially
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.)
Ceased
Application number
EP12401070.3A
Other languages
German (de)
English (en)
Inventor
Wolfgang Bollmers
Wilko Dr. Harms
Jens Micheel
Antje Sonntag
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.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Miele und Cie KG filed Critical Miele und Cie KG
Priority to EP12401070.3A priority Critical patent/EP2657615A1/fr
Publication of EP2657615A1 publication Critical patent/EP2657615A1/fr
Ceased legal-status Critical Current

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Classifications

    • 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
    • F24C15/20—Removing cooking fumes
    • F24C15/2007—Removing cooking fumes from oven cavities
    • F24C15/2014—Removing cooking fumes from oven cavities with means for oxidation of cooking fumes

Definitions

  • the present invention relates to a cooking appliance with a catalyst device and a catalyst device.
  • the catalyst device usually has at least one catalytically active material which supports or catalyzes these conversion reactions. Particularly important for such catalytic reactions and thus also for the cleaning action is that the catalytically active material with the vapors and its constituents, also generally referred to as reactants, comes into contact sufficiently frequently and for a sufficiently long time.
  • catalyst devices in cooking appliances require heat sources which apply the necessary operating temperatures of in some cases more than 500 ° C., since at low operating temperatures the cleaning effect of many catalyst devices is often very low.
  • the heating of the catalyst devices is also expensive, since the heat should be distributed evenly over the catalyst device or the catalytically active material. Otherwise, particularly hot areas, so-called hot spots, can occur which lead to local destruction or changes in the catalytically active material or the catalytically active Can lead coating.
  • the catalytically active material which often comprises precious metals, may change such that it comes, for example, to the ball formation, resulting in the surface of the catalytically active material and thus the contact surface at the overheated areas or at the particularly hot areas for the vapor and its components is reduced, so that the cleaning effect of the catalyst device decreases. Since the catalytically active material of the catalyst device often comprises precious metals, such wear can be particularly costly.
  • the cooking appliance according to the invention has at least one cooking chamber and at least one catalyst device with at least one catalytically active material.
  • the catalyst device comprises at least one at least partially porous body.
  • the cooking appliance according to the invention has many advantages.
  • a significant advantage is that the catalyst device comprises at least one body which is at least partially porous.
  • a porous body has many cavities as well as walls or cell walls and thus has a large surface area in relation to its volume. Therefore, such a body provides a large contact area.
  • the contact surface has at least partially catalytic properties. It is also very preferred that at least one at least partially catalytically active material is provided in and / or on and / or on the walls or cell walls of the porous body. Due to the large contact area, the catalytically active material can come into contact with the reactants and in particular with the vapor and its constituents particularly frequently and for a particularly long time. The large contact surface thus has a very advantageous effect on the cleaning effect of the catalyst device.
  • the porous body has pores or in particular channels and is at least partially permeable.
  • the flow paths or flow connections in particular run at least partially non-parallel to one another and / or are arranged non-linearly relative to one another.
  • the porous body can also have labyrinth-like flow paths exhibit.
  • This is particularly advantageous since such turbulences or flows favor the meeting of reactants with the contact surface of the porous body or the catalytically active material.
  • a particularly good cleaning effect of the catalyst device can be achieved.
  • a cooking appliance with a catalyst device configured in this way releases less unpleasant odors and the vapors contain less fatty substances after catalysis, as a result of which the cooking appliance is considerably less polluted.
  • the released Wrasen causes less dirt and grease deposits in the environment, eg. B. on furniture and walls.
  • the catalyst device consists essentially of at least one porous body. It is also possible that the porous body is only part of the catalyst device.
  • the porous body may preferably be formed as a cylindrical body.
  • the porous body and in particular the size and the shape of the porous body is adapted to the requirements of the catalyst device or the cooking appliance. It is advantageous that a porous body can be easily processed and / or manufactured or adapted accordingly.
  • the catalyst device may in particular comprise at least one housing for at least one of the at least one porous body.
  • the housing may in particular be cylindrical and is preferably adapted to the size and the shape of the porous body.
  • the porous body may also be a foam body and in particular a foamed solid.
  • the porous body is at least partially open-pored and / or open-celled.
  • the porous body may also be formed as a sponge or sponge-like body.
  • a honeycomb-like body and / or a body which has several honeycomb-like structures mounted one behind the other and / or one above the other.
  • the porous body may consist partially or substantially entirely of at least one metal.
  • the porous body may be formed of at least one metal alloy and / or at least one sintered metal. Also possible and preferred is aluminum and / or an aluminum alloy and / or a sintered aluminum material.
  • a porous body may be at least partially composed of at least one ceramic material and / or a glass-ceramic material and / or another suitable material, such as preferably a plastic material.
  • the porous body at least partially comprise a ceramic material and / or be formed from such.
  • the ceramic material may also be made by an extrusion process. Also possible are other suitable sintered materials.
  • the porous body is at least partially formed of or comprises an aluminum foam.
  • Aluminum has good thermal conductivity. A body of aluminum foam can therefore be heated quite evenly. As a result, areas with very high temperatures or "hot spots", which lead to increased wear or even destruction of the catalyst device or of the catalytically active material, can be better avoided. It is also advantageous that aluminum or aluminum foam is easy to work, whereby manufacturing and assembly costs can be saved.
  • the porous body is suitable and designed to at least partially serve as a carrier for at least one catalytically active material.
  • the catalytically active material may be applied substantially directly to the porous body, for example, by a dipping method or the like.
  • the porous body can also indirectly serve as a carrier for the catalytically active material. In this case, for example, at least one coating or the like may be applied between the porous body and the catalytically active material.
  • the porous body itself has at least partially catalytic properties and / or is suitable and designed as an at least partially catalytically active material.
  • the porous body has in all cases a large surface area in relation to its volume, therefore, it is particularly well suited as a carrier for a catalytically active material.
  • the catalytically active material may comprise at least one noble metal and / or at least one noble metal alloy and in particular at least partially palladium and / or at least partially platinum. It is also possible that the catalytically active material comprises at least one other metal and / or at least one transition metal and / or at least one alloy. Also possible are metal complexes and other metal compounds as well as materials which have a suitable catalytic activity.
  • the catalyst device is in particular designed to be at least partially heatable.
  • the catalyst device comprises at least one heat source.
  • the heating source is particularly suitable and designed to heat the catalyst device and in particular at least partially the catalytically active material to an operating temperature.
  • At least one electrical heating source and / or at least one other heating source is possible such as a gas powered heat source.
  • the catalyst device can also be designed without a heat source and / or be formed passively heatable.
  • the heating can also be carried out at least partially by at least one heating source, which serves in particular for heating the cooking chamber.
  • the catalyst device may in particular be arranged so that the heat source for heating the cooking chamber is usable and / or the heat of the heated cooking chamber for heating the catalyst device is used. It is possible that the catalyst device is arranged for example in or in the vicinity of the cooking chamber.
  • the catalyst device can have at least one heat distribution device.
  • the heat distribution device can be arranged at least partially between the heat source and the catalyst device and / or between the heat source and the porous body.
  • the heat distribution device is at least partially designed as a screen and / or at least partially as a grid and is in particular at least partially flowed through.
  • a heat distribution device is particularly advantageous since the heat which is supplied to the catalyst device is distributed substantially uniformly. As a result, essentially all areas of the foam body rapidly reach the required operating temperature.
  • the catalyst device has at least one flow connection to the cooking chamber and / or to an exhaust air duct of the cooking chamber.
  • the catalyst device is arranged and designed so that gases which form during the cooking process as well as vapors and in particular the vapors at least partially come into contact with the catalytically active material of the catalyst device.
  • the catalyst device can be arranged at least partially within the cooking chamber. It is also possible that the catalyst device is arranged outside the cooking chamber and is at least partially in flow communication with at least one exhaust duct of the cooking chamber.
  • the vapor can be passed through the catalyst device at least partially due to a pressure gradient.
  • the pressure gradient is in particular between the side facing the cooking chamber in the flow direction, the input, and the side facing away from the cooking chamber, the output, the catalyst device. It is also possible that the vapor at least partially by a negative pressure in the exhaust duct and / or an overpressure in the oven, as it can occur, for example, when steaming, is passed through the catalyst device.
  • the vapor can be at least partially actively fed to the catalyst device or guided through the catalyst device.
  • at least one fan device is provided. It is possible and preferred that at least one already existing fan device in the cooking appliance and in particular a fan device for the discharge of air from the oven and / or for appliance cooling is at least partially usable. It is also possible at least partial supply of vapor to the catalyst device via other means which cause a flow of the cooking chamber, such as a fan of a Umluft2020.
  • the vapor may also at least partially passively flow to the catalyst means, e.g. B. by convection through a thermal gradient.
  • the catalyst device according to the invention is particularly suitable and suitable for a household appliance and preferably for a cooking appliance and has at least one catalytically active material.
  • the catalyst device comprises at least one porous body.
  • the catalyst device is at least partially formed as previously described.
  • FIG. 1 an inventive cooking appliance 1 is shown in a sectional side view.
  • the cooking appliance 1 can be operated by a user via an operating device 104 and has a cooking chamber 2, which can be closed by a door 106.
  • the cooking chamber 2 is surrounded by a Garraummuffel 101.
  • a heat source 17 is mounted, which is designed here as Um Kunststoffsagenquelle and is provided for cooking food.
  • Other heat sources such as a top heat radiator and a bottom heat radiator and a microwave heat source and the like may be provided.
  • a catalyst device 3 which is attached here on an outer side of the Garraummuffel 101 and serves to reduce greasy and / or odorous substances of the Wrasens.
  • the Garraummuffel 101 has at one point, where the catalyst device 3 is located, an opening, whereby the catalyst device 3 is in flow communication with the cooking chamber 2.
  • the catalyst device 3 is also connected via the connecting channel 107 with the exhaust air duct 103 in flow communication.
  • a fan 102 In the exhaust duct 103 is a fan 102, which sucks air from the environment and with a flow of air in particular heat-sensitive components such as the electronics box 105 cools. The heated air is discharged through the exhaust duct 103 back to the outside in the environment of the cooking appliance 1.
  • the exhaust air duct 103 has a constriction at a point at which the connecting duct 107 enters the exhaust air duct 103.
  • This constriction leads to an increase in the flow velocity of the air flowing through, whereby a negative pressure arises, through which air is sucked out of the connecting channel 107.
  • a device also known as Venturi nozzle 108
  • the air or the vapor must also flow through the catalyst device 3 in this way and can be purified or converted by the catalyst device 3.
  • Another advantage of such a design with the Venturi nozzle 108 is that the vapor can be actively guided through the catalyst device 3, without having to use an additional ventilation device or the like. As a result, considerable manufacturing and assembly costs can be saved.
  • FIG. 2 shows a Garraummuffel 101 with a catalyst device 3 on the upper outer side. But there are also other locations for the attachment of the catalyst device. 3 possible.
  • the catalyst device 3 is in FIG. 3 shown in more detail.
  • the components inside the catalyst device 3 and in particular the porous body 4 and the catalytically active material 13 are here surrounded by a housing 9 and therefore not visible.
  • the housing 9 has at least one and in particular a plurality of flow-through openings, so that air and in particular the vapor can be guided through the catalyst device 3.
  • the catalyst device 3 is designed to be heatable and has a heating source 7 for heating to an operating temperature.
  • a not visible here part of the heat source 7 is located inside the catalyst device 3.
  • the visible here part of the heat source 7 is disposed outside of the housing 9 and serves z. B. for connection to a power source and in particular a power source.
  • the catalyst device 3 from FIG. 3 is in FIG. 4 shown in a cross-sectional view.
  • the housing 9 surrounds the heat source 7 and the porous body 4.
  • the porous body 4, which is designed here as aluminum foam 5, serves as a carrier for the catalytically active material 13.
  • the catalytically active material 13 comprises in particular at least one noble metal such as platinum and / or palladium and is applied to the aluminum foam 5.
  • the heat source 7 is designed here as a heating coil and is located below the aluminum foam 5. Such a configuration is particularly advantageous because the heat source 7 can pass the heating power substantially directly and over a larger area to the aluminum foam 5.
  • Another advantage is that the aluminum foam 5 has a good thermal conductivity and thereby can be heated quickly and substantially uniformly by the heat source 7.
  • air with the vapor then preferably enters the catalyst device 3 from below.
  • the air and in particular the vapors comes into contact with the catalytically active material 13, which is applied to the porous body 4.
  • the contact leads to a catalysis of conversion reactions, in which in particular greasy and / or odorous substances of a Wrasens are split or reduced.
  • the heat of reaction liberated in the process is used to heat the catalyst device 3.
  • the purified air flows together with the reaction products at the top of the catalyst device 3 through at least one housing opening again.
  • the inflowing air with the vapor is distributed to many non-linear channels of the porous body 4, resulting in a chaotic or turbulent flow 10 (indicated by arrows 10 in FIG FIG. 4 ).
  • the inflowing air or the Wrasen are diverted and swirled several times in the porous body.
  • a flow 10 may also be partially divided into a plurality of flows 10 and crossflows, respectively, which then flow through different channels. It is also possible for a plurality of flows 10 and transverse flows to come into contact with one another and to flow together through a channel. Such a distribution of the flow 10 is very advantageous here and leads to improved mixing. This increases the likelihood that greasy and / or offensive components of the vapor will contact the catalytically active material 13, thereby achieving a more complete conversion.
  • FIG. 5 is a cross-sectional schematic view of a catalyst device 3 with a porous body 4, wherein the porous body 4 is formed of a ceramic material 6. Between the porous body 4 and the heat source 7, a heat distribution device 8 is arranged.
  • the heat distribution device 8 is designed here as a grid, which does not block the flow paths through the catalyst device 3.
  • the heat distribution device is preferably made of a good heat conductive material.
  • the heat source 7 heats the heat distribution device 8, which passes on the heat substantially uniformly to the porous body 4.
  • Such a configuration is advantageous for porous bodies 4 of ceramic material 6 or of another material with a lower thermal conductivity.
  • areas with very high temperatures can arise without suitable heat distribution during heating, as a result of which the porous body 4 and in particular the catalytically active material 13 can wear out more quickly or even be destroyed.
  • FIG. 6 A catalyst device 3 without a heat source 7 and without a heat distribution device 8 is shown in FIG FIG. 6 shown schematically.
  • the catalyst device 3 here has a porous body 4, which is formed from a particularly thermally conductive material and preferably from an aluminum foam 5.
  • a heat source 17 of the cooking appliance 1 which serves for the preparation of food to be used to heat the catalyst device 3.
  • the catalyst device 3 is arranged in particular in the vicinity of such a heat source 7.
  • the catalyst device 3 comprises a heat distribution device 8, which can pass the heat from such a heat source 7 to the porous body 4.
  • Such a configuration is particularly cost-effective, as can be dispensed with a separate heat source 7 for the catalyst device 3.
  • the heat of reaction in the catalyzed reaction is utilized to reach or maintain the operating temperature of the catalyst device.
  • the invention provides a simple catalyst device and a cooking appliance equipped therewith, with which an effective and very complete conversion of the vapor can take place.
  • the catalyst device is simple and can be manufactured inexpensively.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Catalysts (AREA)
EP12401070.3A 2012-04-27 2012-04-27 Appareil de cuisson et dispositif de catalyseur Ceased EP2657615A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12401070.3A EP2657615A1 (fr) 2012-04-27 2012-04-27 Appareil de cuisson et dispositif de catalyseur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12401070.3A EP2657615A1 (fr) 2012-04-27 2012-04-27 Appareil de cuisson et dispositif de catalyseur

Publications (1)

Publication Number Publication Date
EP2657615A1 true EP2657615A1 (fr) 2013-10-30

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EP12401070.3A Ceased EP2657615A1 (fr) 2012-04-27 2012-04-27 Appareil de cuisson et dispositif de catalyseur

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10145568B2 (en) 2016-06-27 2018-12-04 Whirlpool Corporation High efficiency high power inner flame burner
USD835775S1 (en) 2015-09-17 2018-12-11 Whirlpool Corporation Gas burner
DE102017223090A1 (de) * 2017-12-18 2019-06-19 BSH Hausgeräte GmbH Gargerät mit einer spezifisch ausgebildeten Katalysatoreinrichtung sowie Verfahren zur Herstellung eines Gargeräts
US10451290B2 (en) 2017-03-07 2019-10-22 Whirlpool Corporation Forced convection steam assembly
US10551056B2 (en) 2017-02-23 2020-02-04 Whirlpool Corporation Burner base
US10619862B2 (en) 2018-06-28 2020-04-14 Whirlpool Corporation Frontal cooling towers for a ventilation system of a cooking appliance
US10627116B2 (en) 2018-06-26 2020-04-21 Whirlpool Corporation Ventilation system for cooking appliance
US10660162B2 (en) 2017-03-16 2020-05-19 Whirlpool Corporation Power delivery system for an induction cooktop with multi-output inverters
US10837652B2 (en) 2018-07-18 2020-11-17 Whirlpool Corporation Appliance secondary door
US10837651B2 (en) 2015-09-24 2020-11-17 Whirlpool Corporation Oven cavity connector for operating power accessory trays for cooking appliance
US11777190B2 (en) 2015-12-29 2023-10-03 Whirlpool Corporation Appliance including an antenna using a portion of appliance as a ground plane

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290483A (en) * 1964-09-15 1966-12-06 Gen Electric Combined broiler and catalytic oxidation unit
DE2640684A1 (de) * 1975-09-11 1977-03-17 Matsushita Electric Ind Co Ltd Koch- und bratapparat mit reinigungseinrichtung
FR2654364A1 (fr) * 1989-11-13 1991-05-17 Hitachi Ltd Catalyseur pour realiser l'oxydation ou la decomposition d'un gaz contenant des constituants odoriferants, procede et applications utilisant un tel catalyseur.
DE4139904A1 (de) * 1991-12-04 1993-06-09 Kueppersbusch Ag, 4650 Gelsenkirchen, De Back- oder bratofen mit einem katalysator
EP0831277A1 (fr) * 1996-09-20 1998-03-25 Bosch-Siemens HausgerÀ¤te GmbH Four avec un catalyseur
EP2093490A1 (fr) * 2008-02-21 2009-08-26 Electrolux Home Products Corporation N.V. Four de cuisson comportant un ensemble de purification de gaz d'échappement
EP2273202A1 (fr) * 2009-07-08 2011-01-12 Electrolux Home Products Corporation N.V. Four de cuisson avec système de filtre catalytique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290483A (en) * 1964-09-15 1966-12-06 Gen Electric Combined broiler and catalytic oxidation unit
DE2640684A1 (de) * 1975-09-11 1977-03-17 Matsushita Electric Ind Co Ltd Koch- und bratapparat mit reinigungseinrichtung
FR2654364A1 (fr) * 1989-11-13 1991-05-17 Hitachi Ltd Catalyseur pour realiser l'oxydation ou la decomposition d'un gaz contenant des constituants odoriferants, procede et applications utilisant un tel catalyseur.
DE4139904A1 (de) * 1991-12-04 1993-06-09 Kueppersbusch Ag, 4650 Gelsenkirchen, De Back- oder bratofen mit einem katalysator
EP0831277A1 (fr) * 1996-09-20 1998-03-25 Bosch-Siemens HausgerÀ¤te GmbH Four avec un catalyseur
EP2093490A1 (fr) * 2008-02-21 2009-08-26 Electrolux Home Products Corporation N.V. Four de cuisson comportant un ensemble de purification de gaz d'échappement
EP2273202A1 (fr) * 2009-07-08 2011-01-12 Electrolux Home Products Corporation N.V. Four de cuisson avec système de filtre catalytique

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD835775S1 (en) 2015-09-17 2018-12-11 Whirlpool Corporation Gas burner
US11460195B2 (en) 2015-09-24 2022-10-04 Whirlpool Corporation Oven cavity connector for operating power accessory trays for cooking appliance
US10837651B2 (en) 2015-09-24 2020-11-17 Whirlpool Corporation Oven cavity connector for operating power accessory trays for cooking appliance
US11777190B2 (en) 2015-12-29 2023-10-03 Whirlpool Corporation Appliance including an antenna using a portion of appliance as a ground plane
US10145568B2 (en) 2016-06-27 2018-12-04 Whirlpool Corporation High efficiency high power inner flame burner
US10551056B2 (en) 2017-02-23 2020-02-04 Whirlpool Corporation Burner base
US10451290B2 (en) 2017-03-07 2019-10-22 Whirlpool Corporation Forced convection steam assembly
US10660162B2 (en) 2017-03-16 2020-05-19 Whirlpool Corporation Power delivery system for an induction cooktop with multi-output inverters
DE102017223090A1 (de) * 2017-12-18 2019-06-19 BSH Hausgeräte GmbH Gargerät mit einer spezifisch ausgebildeten Katalysatoreinrichtung sowie Verfahren zur Herstellung eines Gargeräts
US11885504B2 (en) 2017-12-18 2024-01-30 BSH Hausgeräte GmbH Cooking device with a specifically designed catalyst device, and method for producing a cooking device
CN111448422A (zh) * 2017-12-18 2020-07-24 Bsh家用电器有限公司 具有特别设计的催化装置的烹饪装置以及用于制造烹饪装置的方法
US10627116B2 (en) 2018-06-26 2020-04-21 Whirlpool Corporation Ventilation system for cooking appliance
US11226106B2 (en) 2018-06-26 2022-01-18 Whirlpool Corporation Ventilation system for cooking appliance
US10619862B2 (en) 2018-06-28 2020-04-14 Whirlpool Corporation Frontal cooling towers for a ventilation system of a cooking appliance
US10837652B2 (en) 2018-07-18 2020-11-17 Whirlpool Corporation Appliance secondary door

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