EP0663568A1 - Haushaltskochofen - Google Patents

Haushaltskochofen Download PDF

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Publication number
EP0663568A1
EP0663568A1 EP95400055A EP95400055A EP0663568A1 EP 0663568 A1 EP0663568 A1 EP 0663568A1 EP 95400055 A EP95400055 A EP 95400055A EP 95400055 A EP95400055 A EP 95400055A EP 0663568 A1 EP0663568 A1 EP 0663568A1
Authority
EP
European Patent Office
Prior art keywords
muffle
sensor
fumes
temperature
oven
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
EP95400055A
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English (en)
French (fr)
Other versions
EP0663568B1 (de
Inventor
Sylvain Bickel
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.)
Merloni Electromenager SA
Original Assignee
Scholtes Ste
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
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Application filed by Scholtes Ste filed Critical Scholtes Ste
Publication of EP0663568A1 publication Critical patent/EP0663568A1/de
Application granted granted Critical
Publication of EP0663568B1 publication Critical patent/EP0663568B1/de
Anticipated expiration legal-status Critical
Revoked 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
    • 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 present invention relates to an improvement to domestic cooking ovens or to cookers, in which the destruction or at least the transformation of the vapors or fumes created inside the muffle of the oven during cooking of food is carried out. effecting an effective oxidation of dangerous volatile compounds, in particular carbon monoxide or hydrocarbon products, present in these vapors or fumes, by means of a catalysis action of the latter.
  • the catalyst used usually consists of a block or a pellet of a ceramic material, covered or impregnated with one or more precious metals, of the platinum, palladium, rhodium or other kind, which, in known manner, allow the transformation of carbon monoxide in carbon dioxide at a lower temperature, in particular at that where the fumes or vapors leave the muffle to enter the free recovery space located outside thereof, with or without additional means for raising this temperature at the value necessary for the complete completion of the corresponding reaction.
  • This catalyst is generally in the form of a block or a cylindrical pellet, pierced with holes for the passage of gases or fumes, this block being mounted in a chimney-shaped duct which connects the interior of the muffle to the space where these gases and fumes collect.
  • the combustion products thus oxidized, after being collected in this space at the outlet of the duct, can then be entrained towards the outside in the atmosphere surrounding the furnace, thanks to the entrainment air coming from the fan, without danger to users.
  • the measurement of the temperature and the control of the nature of the gases are carried out by means of probes with appropriate sensors, arranged in the connection conduit before or immediately after the catalysis block, by allowing a control of the difference. reading between the temperature in the muffle and that at the level of the block, by comparison with a reference value to control the speed of temperature rise during cooking or pyrolysis operations.
  • the temperature can reach 250 ° C., which already exceeds the capacities of the usual sensors to withstand it.
  • the temperature can reach in the connecting conduit 400 to 450 °, where no conventional sensor and having an acceptable cost to be mounted in a domestic cooking oven can be suitable.
  • the present invention relates to an improvement made to baking ovens or the like, heated by electrical resistances, in which the measurement sensors used are located in a different manner compared to the solutions known in the prior art, allowing in particular their use whatever the temperature in the oven, even in the pyrolysis phase.
  • the improvement considered, for a baking oven comprising a muffle for receiving the food to be cooked, an external enclosure surrounding the muffle with a pivoting door for access thereto, a collector housed between the muffle and the enclosure, formed of two substantially parallel sheets delimiting a space where the vapors or fumes created in the muffle are collected, communicating with the latter by a conduit in which is preferably mounted a catalytic block crossed by these vapors or fumes from the muffle for their transformation into non-toxic gases gathering in the collector before being evacuated outside the enclosure by outlet orifices formed therein, the temperature control in the muffle, in the cooking or pyrolysis cleaning phase, being carried out by means of at least one sensor sensitive to the temperature or to the composition of the vapors or fumes, in order to provide a signal for controlling the electrical resistances of the oven acting on this temperature, is characterized in that the sensor is disposed beyond but substantially in the vicinity of an orifice through which the duct is in communication with the space collecting the gases coming from the
  • the senor is fixed to one or the other of the two sheets delimiting the collector.
  • the senor is located beyond and downstream from the conduit which passes through the manifold in the direction of flow of the gases, and opens into an open cover where these gases are taken up by the fan which then discharges them into the manifold from the outside of the duct.
  • the reference 1 designates the oven considered taken as a whole, this oven comprising in particular and in itself conventional manner in this kind of device, an external enclosure 2 and, mounted inside this- ci, a muffle 3, inside which the food is cooked, in particular by means of electrical heating resistors (not shown), arranged for example in the sides of the muffle, generally between the latter and the internal wall from enclosure 2 or any other suitable location.
  • electrical heating resistors not shown
  • the furnace being able to be with conventional heating or more elaborate, in particular of the kind known as with circulating heat.
  • the oven may comprise, in addition to the aforementioned heating means, a source of high frequency electrical radiation, for microwave heating.
  • the muffle 3 is closed in use of the oven by a front door 4, articulated in the corresponding face of the enclosure, this door being able to comprise a porthole 5 allowing to see inside the muffle the cooking of the food introduced in the internal region 6 delimited in this muffle.
  • the fumes or vapors produced during this cooking are extracted from the muffle through an evacuation duct 7, bringing the internal region 6 of the muffle into communication with a collector 8, formed between two substantially parallel sheets, respectively 9 and 10, providing between them a free space 11 or into which opens the end of the conduit 7 opposite to that which ensures communication with the interior of the muffle.
  • the space 11 is itself joined by a connecting tube 12 with a fan 13, usually called a tangential, housed inside the enclosure 2 behind and above the muffle 3, this fan ensuring the supply of '' an air flow suitable for entraining the fumes and vapors collected in the space 11 by the conduit 7 before discharging them outside the enclosure by an outlet orifice 14 provided in the front face of that -ci, above the door 4, this orifice may include a protective grid (not shown).
  • FIGS. 2 and 3 illustrate in more detail the particular embodiment of the upper part of the muffle 3 and of the connecting duct 7 between this muffle and the free space 11 formed in the manifold 8.
  • the door 4 closing the muffle at the front thereof comprises a closing system 15, cooperating with a locking member 16, making it possible in particular to keep the door closed and in particular to avoid any untimely opening of the latter in the pyrolysis phase for cleaning the oven.
  • a closing system 15 cooperating with a locking member 16
  • the provisions of the present invention can be applied equally well for ovens which do not pyrolise residual fumes or grease, in which case the locking member 16 is no longer necessary.
  • the muffle 3 comprises an upper sheet 17 forming a ceiling and, attached and immobilized thereon, a second sheet 18, welded in 19 to the first and defining therewith a flat box 20, thus provided in the ceiling of the muffle.
  • a high electrical resistance 21 called the grill resistance and intended to ensure the surface cooking of the food inside the muffle, when it is brought to red at a temperature of the order of 7 at 800 ° C. Note that this resistance is also used and if necessary for the pyrolysis of the oven when it is brought to this temperature, in this case cracking the molecules of greases and other hydrocarbon products which have soiled the walls of the oven, this combined use of the resistor 21 is already well known in the art.
  • the resistor 21 is generally formed of a continuous element having successive convolutions so as to be distributed as well as possible over the entire surface of the ceiling of the muffle, in particular at the level of the flat box 20. It thus comprises longitudinal parts 22 extending in the muffle between the bottom thereof and the vicinity of the front door 4, these longitudinal parts being connected from one to the other at their ends by connecting parts 23 curved or straight, the resistor being connected by connecting members 24 to a source of electric current.
  • the latter is formed by means of a tube element 24, opening into the muffle at the bottom and in the sheet 10 in the upper part through flanges of the same diameter, 25 and 26, in particular through an appropriate layer 27 of an insulating material placed between the collector and the box.
  • a catalysis block 28 preferably in the form of a pellet of a suitable ceramic material, covered or impregnated with a precious metal of the usual kind for such use, in particular platinum, palladium, rhodium or others, allow in particular to carry out an effective oxidation of certain volatile compounds of the fumes or vapors created in the muffle and escaping from it through the box 20 in which they are collected after passing through the block 28 which is for this purpose provided with a set of communication passages 29.
  • a precious metal of the usual kind for such use in particular platinum, palladium, rhodium or others
  • Control of the temperature in the muffle by controlling the electrical resistances thereof, in particular during the cooking of the food and if necessary to carry out the cleaning operation by pyrolysis, is ensured, in itself known manner by at least one sensor sensitive to the temperature or to the composition of the vapors or fumes produced in the oven and preferably in the vicinity of the exhaust duct 7 containing the catalysis block, in a location which gives the best image of the state cooking before the analyzed fumes and vapors are diluted by the ambient air supplied by the fan which discharges them outside the oven enclosure.
  • the oven always uses a sensor 30 of the aforementioned kind but placed in a place such that it supports a relatively low temperature, at most equal to 250 °, even when the temperature in the muffle reaches or exceeds 450 °, in particular in the pyrolysis phase.
  • the senor 30 is thus disposed in the manifold 8, substantially downstream of the communication conduit 7, while being fixed on the upper sheet 9 of this connector.
  • the location chosen is such that the sensor is actually placed in an environment at a lower temperature but in which it is still essentially surrounded by the gases and fumes delivered by the communication conduit inside the collector, without these gases and fumes were still largely diluted by the air discharged by the fan 13.
  • the senor 30 shown is illustrated with its electrical connections 31, making it possible to connect it to a measuring device integrated in the enclosure of the oven, this device itself being connected to a display on the front face of this oven, allowing to know at all times the actual measured temperature.
  • the increase in the concentration of a predetermined gas, to which the sensor is more particularly sensitive, for example carbon monoxide or hydrogen in combined form corresponds to a modification of the signal of this sensor.
  • FIGS 4 and 5 on which the same reference numerals have been used illustrate an alternative embodiment in which the sensor 30 is no longer fixed on the upper sheet 9 of the collector 8 but on the lower sheet 10, the choice being able to be dictated by the constraints of fitting out the collector and connecting the sensor to its measuring device.
  • the sensor 30 is disposed on the upper sheet 9 of the manifold 8 but outside of the latter.
  • the exhaust duct 7 delivers the gases and fumes coming from the cavity of the muffle 6 in a space provided under a cover 32, comprising a horizontal flat return 33 returning these gases or fumes to the suction passages of the fan 13 which then drives them back into the collector 8 from the outside of the part of the conduit 7 which passes through it.
  • the senor is placed in an area where the gases which sweep it are at a temperature substantially lower than that which prevails in the communication conduit, before and even after passage through the catalysis block. Under these conditions, it becomes possible to use sensors having an acceptable cost price and also to use them on pyrolysis ovens where this use has so far been prevented due to the temperatures encountered.
  • the electrical connections of the sensor can be simpler and also less expensive since the connections can also be made outside the zones brought to high temperature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Jellies, Jams, And Syrups (AREA)
  • Electric Stoves And Ranges (AREA)
  • Baking, Grill, Roasting (AREA)
EP95400055A 1994-01-12 1995-01-11 Haushaltskochofen Revoked EP0663568B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9400281A FR2714959A1 (fr) 1994-01-12 1994-01-12 Four de cuisson domestique.
FR9400281 1994-01-12

Publications (2)

Publication Number Publication Date
EP0663568A1 true EP0663568A1 (de) 1995-07-19
EP0663568B1 EP0663568B1 (de) 1998-04-08

Family

ID=9458967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95400055A Revoked EP0663568B1 (de) 1994-01-12 1995-01-11 Haushaltskochofen

Country Status (4)

Country Link
EP (1) EP0663568B1 (de)
AT (1) ATE164933T1 (de)
DE (1) DE69501965T2 (de)
FR (1) FR2714959A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998004174A1 (en) * 1996-07-29 1998-02-05 Philips Electronics N.V. Deep-frying device
EP1050718A2 (de) * 1999-05-04 2000-11-08 AEG Hausgeräte GmbH Garofen mit Wrasenabführung und Frischluftbeimischung
EP1400758A1 (de) * 2002-09-23 2004-03-24 CANDY S.p.A. Heizeinheit für einen Backofen
WO2006056305A1 (de) * 2004-11-25 2006-06-01 Miele & Cie. Kg Backofen mit einem wrasenkanal in dem katalysator und ein gassensor angeordnet sind
EP1845311A1 (de) 2006-04-12 2007-10-17 Brandt Industries Vorrichtung zur Temperaturmessung in einem Backofen und Backofen, der eine solche Temperaturmessvorrichtung umfasst
EP1909037A3 (de) * 2006-10-05 2010-12-22 Miele & Cie. KG Backofen mit einer Backmuffel und einem Querstromlüfter
CN103765109A (zh) * 2012-06-12 2014-04-30 李永熙 具有热解功能的电烤炉
EP2824394A1 (de) * 2013-07-11 2015-01-14 Miele & Cie. KG Gargerät und Katalysatoreinrichtung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163183A1 (de) * 2001-12-21 2003-07-03 Bsh Bosch Siemens Hausgeraete Gargerätemuffel sowie Verfahren zur Herstellung einer Gargerätemuffel
DE10202132B4 (de) * 2002-01-21 2011-07-14 BSH Bosch und Siemens Hausgeräte GmbH, 81739 Backofen mit einem Wrasenkanal
WO2018024566A1 (en) 2016-08-03 2018-02-08 Arcelik Anonim Sirketi Oven with improved fume extraction

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2216527A1 (de) * 1973-02-02 1974-08-30 Burger Eisenwerke Ag
DE3209541A1 (de) * 1982-03-16 1983-09-29 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Backofen
US4601279A (en) * 1984-07-10 1986-07-22 Societe De Dietrich Pyrolytic self-cleaning domestic oven with improved means for protecting electronic panel and controls from heat damages
EP0279065A2 (de) * 1987-02-06 1988-08-24 Electrolux-Juno Küchentechnik GmbH Vorrichtung zur Steuerung der Dampfleistung eines mit Dampf betriebenen Gargerätes
EP0500471A1 (de) * 1991-02-21 1992-08-26 Société SCHOLTES Haushaltkochofen
FR2673268A1 (fr) * 1991-02-21 1992-08-28 Scholtes Ets Eugen Four de cuisson electrique a usage domestique.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2216527A1 (de) * 1973-02-02 1974-08-30 Burger Eisenwerke Ag
DE3209541A1 (de) * 1982-03-16 1983-09-29 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Backofen
US4601279A (en) * 1984-07-10 1986-07-22 Societe De Dietrich Pyrolytic self-cleaning domestic oven with improved means for protecting electronic panel and controls from heat damages
EP0279065A2 (de) * 1987-02-06 1988-08-24 Electrolux-Juno Küchentechnik GmbH Vorrichtung zur Steuerung der Dampfleistung eines mit Dampf betriebenen Gargerätes
EP0500471A1 (de) * 1991-02-21 1992-08-26 Société SCHOLTES Haushaltkochofen
FR2673268A1 (fr) * 1991-02-21 1992-08-28 Scholtes Ets Eugen Four de cuisson electrique a usage domestique.

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998004174A1 (en) * 1996-07-29 1998-02-05 Philips Electronics N.V. Deep-frying device
US5924414A (en) * 1996-07-29 1999-07-20 U.S. Philips Corporation Deep-frying device
EP1050718A2 (de) * 1999-05-04 2000-11-08 AEG Hausgeräte GmbH Garofen mit Wrasenabführung und Frischluftbeimischung
EP1050718A3 (de) * 1999-05-04 2002-04-03 AEG Hausgeräte GmbH Garofen mit Wrasenabführung und Frischluftbeimischung
EP1400758A1 (de) * 2002-09-23 2004-03-24 CANDY S.p.A. Heizeinheit für einen Backofen
US8469017B2 (en) 2004-11-25 2013-06-25 Miele & Cie. Kg Baking oven with a vapor channel in which a catalyst and a gas sensor are arranged
WO2006056305A1 (de) * 2004-11-25 2006-06-01 Miele & Cie. Kg Backofen mit einem wrasenkanal in dem katalysator und ein gassensor angeordnet sind
EP1845311A1 (de) 2006-04-12 2007-10-17 Brandt Industries Vorrichtung zur Temperaturmessung in einem Backofen und Backofen, der eine solche Temperaturmessvorrichtung umfasst
FR2899968A1 (fr) * 2006-04-12 2007-10-19 Brandt Ind Sas Dispositif de mesure de temperature dans un four de cuisson et four de cuisson comprenant un tel dispositif de mesure de temperature
EP1909037A3 (de) * 2006-10-05 2010-12-22 Miele & Cie. KG Backofen mit einer Backmuffel und einem Querstromlüfter
US8950389B2 (en) 2006-10-05 2015-02-10 Miele & Cie. Kg Oven with a chamber and a cross-flow blower
CN103765109A (zh) * 2012-06-12 2014-04-30 李永熙 具有热解功能的电烤炉
CN103765109B (zh) * 2012-06-12 2016-05-11 李永熙 具有热解功能的电烤炉
EP2824394A1 (de) * 2013-07-11 2015-01-14 Miele & Cie. KG Gargerät und Katalysatoreinrichtung
DE102013107361A1 (de) * 2013-07-11 2015-01-15 Miele & Cie. Kg Gargerät und Katalysatoreinrichtung

Also Published As

Publication number Publication date
DE69501965D1 (de) 1998-05-14
EP0663568B1 (de) 1998-04-08
FR2714959A1 (fr) 1995-07-13
ATE164933T1 (de) 1998-04-15
DE69501965T2 (de) 1998-08-13

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