EP0220119A1 - Kochofen mit pyrolitischer Selbstreinigung - Google Patents

Kochofen mit pyrolitischer Selbstreinigung Download PDF

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Publication number
EP0220119A1
EP0220119A1 EP86402261A EP86402261A EP0220119A1 EP 0220119 A1 EP0220119 A1 EP 0220119A1 EP 86402261 A EP86402261 A EP 86402261A EP 86402261 A EP86402261 A EP 86402261A EP 0220119 A1 EP0220119 A1 EP 0220119A1
Authority
EP
European Patent Office
Prior art keywords
catalyst
resistance
oven
oven according
vault
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.)
Granted
Application number
EP86402261A
Other languages
English (en)
French (fr)
Other versions
EP0220119B1 (de
Inventor
Jean-Marie Gelineau
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.)
Compagnie Europeenne pour lEquipement Menager SA
Original Assignee
Compagnie Europeenne pour lEquipement Menager SA
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 Compagnie Europeenne pour lEquipement Menager SA filed Critical Compagnie Europeenne pour lEquipement Menager SA
Publication of EP0220119A1 publication Critical patent/EP0220119A1/de
Application granted granted Critical
Publication of EP0220119B1 publication Critical patent/EP0220119B1/de
Expired 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
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type

Definitions

  • the invention relates to a pyrolysis cleaning cooking oven having a catalyst in the smoke evacuation circuit.
  • Pyrolysis is a known operation for cleaning baking ovens which consists of destroying by heat the fatty deposits or dirt which appear on the walls of an oven during cooking or reheating of food.
  • the temperature of the oven must be 500 ° C for the pyrolysis to take place normally, which is obtained by putting simultaneously into service at least the vault resistors and the sole resistors that the oven can contain.
  • the catalyst is brought to a temperature of 350 ° C. and becomes effective before the temperature of the center of the furnace reaches the saturation temperature in smoke.
  • the subject of the invention is therefore a pyrolytic oven with a smoke catalyst which does not have these drawbacks, and which allows the pyrolysis operation to be carried out without additional consumption compared to the ovens of the prior art.
  • the cooking ovens generally comprise at least one resistance of the vault, in the upper part, and one of the hearth, in the lower part of the oven.
  • the floor resistor can be in two parts which can be supplied separately.
  • the smoke evacuation duct is located in the upper part, near the vault.
  • the invention starts from these observations and also aims at the production of a catalyst pyrolysis oven, the priming of which takes place before the furnace is saturated by the fumes.
  • a pyrolytic electric oven with smoke catalyst comprising at least one vault resistance and one sole resistance of usual values, is characterized in that it comprises means for putting into service at the start of an operation. simultaneously and exclusively pyrolysis the vault resistance and part of the sole resistance, such that the power supplied by this part of sole resistance is less than the power supplied by the vault resistance, and in that the catalyst consists in a material which allows its priming exclusively thanks to the convection heat passing through the duct where it is located and coming from the oven thanks to said vault resistance and sole resistance part, before the oven is saturated by the fumes.
  • the catalyst consists of a cellular ceramic impregnated with platinum oxide in an amount such that it initiates when it is at a temperature below 300 ° C.
  • This temperature can easily be obtained in the conduit where the catalyst is located using conventional vault and sole resistors.
  • resistors of higher value which would lead to higher consumption during cooking and pyrolysis.
  • the ignition temperature of the catalyst is obtained by using exclusively resistors used for cooking, it will happen under certain cooking conditions that the catalyst becomes effective, if its temperature is higher than the ignition temperature. In this case, if fumes appear during cooking, they will be purified of harmful gases.
  • the power distributed to the cooking chamber is modified so that the pyrolysis temperature is reached in the oven.
  • means are provided for detecting the fact that the catalyst has reached its initiation temperature.
  • a pyrolysis cleaning oven 1 having a catalyst 2 based on cellular ceramic impregnated with platinum oxide, which initiates at 250 ° C., and which is placed in a conduit 3 for discharging the fumes.
  • the oven comprises at least one vault resistor 4 and a hearth resistor comprising two parts 5, 6 which can be supplied separately.
  • the first part 5 is, for example, a peripheral part and the second part 6 is for example the central part. It is indeed common to make ovens having such a hearth resistance structure.
  • Means for commissioning the resistors are provided. They are for example constituted by a switch 7 with several positions.
  • the vault resistor and the peripheral part 5 of the floor resistor are supplied using the switch 7. This is achieved by putting the switch in position 1 in solid lines in the figure.
  • the peripheral part 5 of the floor resistor is generally less soiled by dirt than the central part 6. This therefore explains the choice of supplying this peripheral part.
  • the peripheral part 5 of the floor resistor has a lower power than that of the vault resistor
  • the simultaneous entry into service of the vault resistor 4 and of the peripheral part 5 of the hearth resistor allows the oven to heat up without significant creation of smoke.
  • the vault resistance with a power greater than the peripheral part of the sole resistance, more easily influences the catalyst.
  • the simultaneous commissioning of the peripheral part 5 of the floor resistor promotes the convection of heat to the duct 3, and prevents too much of the energy supplied by the vault resistor from being used for reheat the enclosure, and therefore be lost to reheat the duct 3 where the catalyst 2 is located.
  • a temperature at the center of the furnace is quickly obtained, depending on the types of oven. 250 ° C and 350 ° C which allows the initiation of the catalyst before saturation of the furnace by the fumes.
  • the power is modified to quickly obtain the 500 ° C. in the furnace, for example by putting in service in addition the central part 6 of the hearth resistance and any other resistances that can include the oven (position 2 of the commu 7).
  • thermostat 8 which allows an all-or-nothing regulation of the temperature in the center of the oven in order to maintain it at 500 ° C.
  • the thermostat 8 opens and closes a switch 9 which controls the general supply of the resistances of the oven.
  • the temperature of the catalyst is a function of the temperature of the center of the furnace.
  • the switch 7 can be associated with a reversing thermostat (not shown) which detects the temperature in the center of the oven and switches on the higher power as soon as the temperature of the center of the oven is such that the temperature of the duct is sufficient for the catalyst to prime.
  • a reversing thermostat not shown
  • the priming takes place for a temperature in the center of the oven of between 250 ° C and 350 ° C.
  • the exact threshold is determined during the start-up settings.
  • a variant consists in placing the thermostat in the duct 3, in the immediate vicinity of the catalyst. However, there is a risk of the thermostat getting dirty.
  • the switch 7 is associated with a clock, reset at the start of a pyrolysis operation.
  • the rise in temperature of an oven is a function of time, and for a given type of oven, knowing which resistances are in service, we can determine by measurement when after commissioning, the oven reaches a temperature given.
  • FIG. 2 represents an improved variant of the oven of the invention.
  • the switch 7 is associated with an electronic device 10 which makes it possible to activate the desired resistances during the cooking operations and the pyrolysis operations.
  • the device 10 controls the opening or closing of the contacts 11, 12, 13 placed in the supply circuit of the vault resistors 4 and of the sole 5, 6.
  • the device allows obtain associations in parallel. It is conceivable that the device allows series-parallel associations.
  • the device is associated with thermostat 8 from which it derives its control information.
  • the device closes the switches 11 and 12 respectively associated with the vault resistors 4 and the peripheral sole 5.
  • thermostat trigger threshold at the oven temperature corresponding to the priming of the catalyst.
  • the device switches on the power necessary to bring the oven to 500 ° C and regulate this temperature.
  • the device is associated with a clock which switches when the ignition time is exceeded.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Catalysts (AREA)
EP86402261A 1985-10-16 1986-10-10 Kochofen mit pyrolitischer Selbstreinigung Expired EP0220119B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8515306 1985-10-16
FR8515306A FR2588641B1 (fr) 1985-10-16 1985-10-16 Four de cuisson a nettoyage par pyrolyse

Publications (2)

Publication Number Publication Date
EP0220119A1 true EP0220119A1 (de) 1987-04-29
EP0220119B1 EP0220119B1 (de) 1989-11-02

Family

ID=9323862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402261A Expired EP0220119B1 (de) 1985-10-16 1986-10-10 Kochofen mit pyrolitischer Selbstreinigung

Country Status (5)

Country Link
US (1) US4831237A (de)
EP (1) EP0220119B1 (de)
DE (1) DE3666729D1 (de)
ES (1) ES2011453B3 (de)
FR (1) FR2588641B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2724832A1 (fr) * 1994-09-26 1996-03-29 Seb Sa Appareil de cuisson et dispositif formant catalyseur pour un tel appareil

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1246187B (it) * 1990-07-24 1994-11-16 Eurodomestici Ind Riunite Dispositivo per la pulizia mediante pirolisi della camera di cottura di un forno atto alla preparazione degli alimenti
US5528018A (en) * 1991-08-19 1996-06-18 Henny Penny Corporation Programmable load compensation method and apparatus for use in a food
US5534678A (en) * 1993-11-12 1996-07-09 General Electric Company Oven with improved self-cleaning cycle
US5688422A (en) * 1995-04-28 1997-11-18 Henny Penny Corporation Programmable fan control method and apparatus for use in a food oven
DE19606571C2 (de) * 1996-02-22 2001-02-08 Gaggenau Werke Backofen mit pyrolytischer Reinigung sowie Verfahren zum Betrieb eines solchen Backofens
DE19638665A1 (de) 1996-09-20 1998-03-26 Bosch Siemens Hausgeraete Backofen mit einem Katalysator
DE19706186A1 (de) * 1997-02-17 1998-08-20 Miele & Cie Backofen und Verfahren zur Steuerung eines Pyrolysereinigungsvorganges
US6316749B1 (en) 2000-08-29 2001-11-13 Maytag Corporation Self-cleaning system for a cooking appliance
US6417493B1 (en) 1999-09-13 2002-07-09 Maytag Corporation Self-cleaning method for a cooking appliance
US6392204B2 (en) 2000-07-12 2002-05-21 Whirlpool Corporation System for controlling the duration of a self-clean cycle in an oven
US6784404B2 (en) 2000-07-12 2004-08-31 Whirlpool Corporation System for controlling the duration of a self-clean cycle in an oven
US6872919B2 (en) * 2000-08-29 2005-03-29 Maytag Corporation Multi-stage catalyst for a cooking appliance
US6730879B1 (en) * 2003-03-12 2004-05-04 General Electric Company Self-cleaning systems and methods
DE102005044698A1 (de) * 2005-09-19 2007-03-22 BSH Bosch und Siemens Hausgeräte GmbH Hocheinbau-Gargerät
US8418684B2 (en) * 2007-08-24 2013-04-16 Catalytic Combustion Corporation Catalytic converter unit and method for treating cooking emissions
US20140318382A1 (en) * 2010-05-11 2014-10-30 Standex International Corporation Quick heating quartz toaster
US9683747B2 (en) * 2011-12-16 2017-06-20 Alto-Shaam, Inc. Combination oven with catalytic converter
US9841195B2 (en) 2013-02-28 2017-12-12 Haier Us Appliance Solutions, Inc. Non-stick, pyrolytic coatings for heating devices
NZ746496A (en) * 2016-03-09 2021-12-24 Dmp Entpr Pty Ltd Conveyor-type oven
CN215305176U (zh) * 2021-06-15 2021-12-28 江门市新会恒隆家居创新用品有限公司 多士炉

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1941338A1 (de) * 1968-08-21 1970-02-26 Tappan Co Elektrische Schaltung fuer einen selbstreinigenden Ofen
FR2365927A1 (fr) * 1976-09-28 1978-04-21 Cepem Procede et dispositif de regulation de la temperature de nettoyage d'un four
US4302661A (en) * 1980-03-31 1981-11-24 Perry Jr Edward H Self-cleaning oven control system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3428435A (en) * 1964-09-15 1969-02-18 Gen Electric Self-sustaining catalytic oxidation unit
US3474226A (en) * 1967-08-10 1969-10-21 Kelvinator Inc Range oven heating control circuit for pyrolytic oven cleaning
US3484858A (en) * 1967-11-24 1969-12-16 Gen Electric Self-cleaning oven with over-temperature protective systems
FR2391425A1 (fr) * 1977-05-16 1978-12-15 Cepem Four pyrolytique a rapidite de chauffe variable
GB2112936B (en) * 1982-01-04 1985-02-13 Froude Eng Ltd Measuring the speed of a piston engine ultrasonically
US4481404A (en) * 1982-12-22 1984-11-06 General Electric Company Turn-off control circuit for self-cleaning ovens
US4493976A (en) * 1983-05-02 1985-01-15 General Electric Company Pyrolytic oven cleaning system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1941338A1 (de) * 1968-08-21 1970-02-26 Tappan Co Elektrische Schaltung fuer einen selbstreinigenden Ofen
FR2365927A1 (fr) * 1976-09-28 1978-04-21 Cepem Procede et dispositif de regulation de la temperature de nettoyage d'un four
US4302661A (en) * 1980-03-31 1981-11-24 Perry Jr Edward H Self-cleaning oven control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2724832A1 (fr) * 1994-09-26 1996-03-29 Seb Sa Appareil de cuisson et dispositif formant catalyseur pour un tel appareil

Also Published As

Publication number Publication date
US4831237A (en) 1989-05-16
FR2588641B1 (fr) 1987-11-20
FR2588641A1 (fr) 1987-04-17
ES2011453B3 (es) 1990-01-16
EP0220119B1 (de) 1989-11-02
DE3666729D1 (en) 1989-12-07

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