EP0319377A1 - Verfahren zum Regeln der Wärmezeit beim pyrolitischen Reinigen eines Backofens und Backofen zur Verwendung dieses Verfahrens - Google Patents

Verfahren zum Regeln der Wärmezeit beim pyrolitischen Reinigen eines Backofens und Backofen zur Verwendung dieses Verfahrens Download PDF

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Publication number
EP0319377A1
EP0319377A1 EP88402947A EP88402947A EP0319377A1 EP 0319377 A1 EP0319377 A1 EP 0319377A1 EP 88402947 A EP88402947 A EP 88402947A EP 88402947 A EP88402947 A EP 88402947A EP 0319377 A1 EP0319377 A1 EP 0319377A1
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EP
European Patent Office
Prior art keywords
oven
temperature
pyrolysis
heating
timer
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.)
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Application number
EP88402947A
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English (en)
French (fr)
Inventor
Jacques Bonnet
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
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Filing date
Publication date
Application filed by Compagnie Europeenne pour lEquipement Menager SA filed Critical Compagnie Europeenne pour lEquipement Menager SA
Publication of EP0319377A1 publication Critical patent/EP0319377A1/de
Withdrawn legal-status Critical Current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 method of controlling the heating time for cleaning by pyrolysis of a domestic cooking oven, and relates to a cooking oven implementing the method.
  • the object of the invention is in particular, on the one hand, to reduce the cost of cooking ovens for cleaning by pyrolysis without impairing their ease of use, and on the other hand to allow a reduction in the time necessary to carry out the cleaning operation by pyrolysis.
  • the cleaning by pyrolysis of a domestic cooking oven consists in particular of a charring of residues, coming from projections or due to overflows of products inside the oven enclosure.
  • the oven has different heating elements, consisting of electrical resistances, some or all of which are put into operation so as to bring the interior of the oven to the so-called pyrolysis temperature, that is to say about 500 ° C.
  • the minimum time necessary for a pyrolysis cleaning operation can vary significantly from one oven to another, since there can be relatively significant changes in the power of the elements. heated; there may also exist for the same oven variations in the heating power, from one moment to another, due to variations in the electrical voltage of the network.
  • the heating elements are put into operation for a predetermined time which is the one needed for all of the heating operation, that is to say that this predetermined time takes into account the rise in temperature from the initial temperature of the oven to the temperature chosen for the pyrolysis (approximately 500 ° C.), the higher the time during which the pyrolysis temperature is maintained.
  • This predetermined heating time duration or recommended in the case where the user has the option of adjusting the heating time himself, is set by the manufacturer, who determines this time as long as possible, to take account of possible variations in power of the heating elements from one oven to another, variations in network voltage and an initial temperature equal to ambient temperature.
  • the cleaning operation by pyrolysis of an oven is carried out with the oven door closed.
  • the latter is locked when the temperature in the oven reaches and exceeds a temperature known as the locking temperature which is at most 350 ° C.
  • the locking temperature which is at most 350 ° C.
  • the door is locked, it cannot be opened by the user, and it can be opened again only when it is unlocked, that is to say when the oven temperature drops below 350 ° C; the locking control being generally obtained from a conventional thermostat.
  • the present invention relates to a method for controlling the pyrolysis heating time which makes it possible to reduce the time necessary for a pyrolytic cleaning operation of a baking oven, without affecting the quality of the cleaning, and therefore to make this baking oven more widely usable while reducing its energy consumption.
  • One of the other aims of the invention is to simplify the use of a pyrolysis cleaning cooking oven, by avoiding having to use an expensive clock device while retaining the possibility of canceling, within a certain time, the cleaning command to use the oven in another function.
  • a method of controlling the heating time for cleaning by pyrolysis of a cooking oven comprising selecting a pyrolysis function and heating the oven to raise its temperature from an initial temperature to a temperature of pyrolysis, then to maintain the pyrolysis temperature until the end of a predetermined time, is characterized in that it consists in starting the countdown of the predetermined time after having started the heating for cleaning by pyrolysis of the oven.
  • the figure shows the electrical diagram of a cooking oven according to the invention, and makes it possible in particular to show the interconnection of elements in the case of a cleaning command by pyrolysis of the oven.
  • the oven 1 comprises a conventional function switch 2, having n positions P1, P2, ..., Pn which each correspond to the control of a function, such as for example: "cleaning by pyrolysis" for the first position P1, " off “for the second position P2,” fan heat "for the third position P3, etc.
  • the function switch 2 is of the rotary type, which may include a plurality of circuits or stages of which only two stages E1, E2 are shown for clarity of the figure.
  • the heating of the oven 1 to raise its temperature to the so-called pyrolysis temperature is carried out by an electric heating element 4 which, for the sake of clarity of the figure, is represented by a single rectangle; but it is known that the heating element 4 for the pyrolysis heating can be constituted by a combination of several electrical resistors (not shown) which, especially for the pyrolysis heating, are mounted in parallel and / or in series according to known configurations.
  • a first end 5 of the heating element 4 is connected to a first contact 6 of a switch circuit 7, the actuation of which is controlled by a first thermostat or regulating thermostat 8.
  • a second contact 9 of the switch circuit 7 is connected at one of the poles 10 of a power source 11 such as the 220 Volt sector for example.
  • the function of the regulating thermostat 8, by acting on the switch circuit 7, is to cut the electrical supply to the heating element 4 when the pyrolysis temperature, of the order of 500 ° C., is reached, and to restore this supply when the oven cools and its temperature is lower than the pyrolysis temperature; this regulation thermostat 8 thus conventionally performs a sawtooth regulation which tends to stabilize the temperature of the oven around the so-called pyrolysis temperature.
  • the second polarity 12 of the supply voltage delivered by the power source 11, is connected to the movable contact A0 of the first stage E1 of the function switch 2, whose contact A1 corresponding to the first position P1, is connected to the second end 14 of the heating element 4, via a second switch circuit 15.
  • the second switch circuit 15 is used to cut the power supply to the heating element 4 at the end of a time programmed by a clock device 16.
  • the clock device 16 consists of a cyclic current cut-off timer 18, of a conventional type, controlled by a motor 17, and which may for example have a total cycle time of the order of 60 or 90 or 120 minutes.
  • the timer 18 controls an inverter circuit 20 which makes it possible to establish conditions for the supply of the motor 17 by the power source 11.
  • a first supply input 21 of the motor 17 is connected at the first polarity 10 of the supply voltage, and a second supply input 22 of the motor 17 is connected to the movable contact 23 of the inverter circuit 20.
  • a first contact pad 25 of the inverter circuit 20 is connected to the contacts B2 to Bn of the second stage E2, corresponding to positions P2 to Pn of the function switch 2.
  • a second contact pad 26 of the inverter circuit 20 is connected to a contact 33 of a second inverter circuit 30 of a thermal relay or thermostat called thermostat 31 or safety thermostat.
  • the locking thermostat exercises a first known function (not shown) which is to control the locking of the door (not shown) of the oven when the temperature of the latter reaches a so-called locking temperature, of the order of 350 ° C., and authorize the door to be unlocked when the oven temperature has dropped below this value.
  • the locking thermostat 31 additionally exercises a new function which consists in starting the operation of the clock device 16, as is explained further in a description below.
  • the second reversing circuit 30 has a movable contact 32 which is connected to the second polarity 12 of the supply voltage.
  • the second reversing circuit 30 includes a second contact 34 which is connected to the movable contact B0 of the second stage E2 of switch 2.
  • the clock device 16 which is constituted in the nonlimiting example described by the timer 18, is at zero.
  • the second switch 15 is closed, so that it suffices to control the cleaning by pyrolysis (position P1) to supply the heating element 4, the first circuit 7 being - even closed as long as the pyrolysis temperature is not reached;
  • the movable contact 23 is oriented on the second contact pad 26, which is itself connected to the first contact 33 of the second reversing circuit 30. It should be observed that at level of the second reversing circuit 30, the movable contact 32 is in contact with the second contact 34 as long as the temperature of the oven is lower than the locking temperature.
  • the heating element 4 is supplied and heats the oven, the temperature of which rises. It is noted that when the function switch 2 is in the position P1 (pyrolysis), the contact Bo-B2 is open at stage 2, so that the first contact pad 25 of the first inverter 20 is no longer connected to the second polarity 12 of the power supply 11.
  • the heating control of the oven for cleaning by pyrolysis does not cause the programmed heating time to be counted down.
  • the countdown of a programmed heating time for cleaning by pyrolysis begins largely after the moment when the heating element 4 is switched on.
  • the locking thermostat 31 controls the tilting of the movable contact 32 of the second change-over circuit 30, this closes the contact 32-33; so that the motor 17 is powered and drives the timer 18.
  • the programmed time is counted down by the timer 18; this programmed time including the time necessary to raise the oven temperature from the lockout temperature to the pyrolysis temperature, plus the time when it is necessary to maintain the pyrolysis temperature (500 ° C), temperature regulation of pyrolysis being obtained using the regulating thermostat 8.
  • the timer 18 opens the second switch circuit 15 so as to cut off the supply to the heating element 4, and on the other hand it modifies the state of the first change-over circuit 20 so as to remove the power supply from its motor 17: in fact, the movable contact 23 of the change-over circuit 20 is then switched to the first contact pad 25, so that the motor 17 is no longer supplied with power and that the timer 18 remains in an intermediate position of its cycle.
  • the contact B0-B2 at the second stage E2 is closed.
  • Two possibilities are then to be considered: - If the temperature in the oven is low enough, the locking thermostat 31 controls the tilting of the second inverter circuit 30 and the contact 32-34 is closed; the motor 17 is again supplied with power and the timer 18 is driven until it returns to the starting zero position. - if the oven temperature is above 350 ° C, i.e. above the lockout temperature, the system remains stationary until the oven temperature is effectively below the lockout limit and by subsequently, that the motor 17 is powered.
  • the above-mentioned programmed heating time can be made even shorter and therefore even more reliable, by starting the counting of this time closer to the instant when the temperature of pyrolysis is reached or at the instant when it is reached: using for example another temperature sensor (not shown) delivering, at a predetermined temperature, a command for counting down the time by the clock device 16 ; or even more advantageously by starting the countdown of time with the first switching of the first thermostat 8 or regulation thermostat; this can be done by a person skilled in the art from the present description, in a simple manner which does not require further specification.
  • the clock device 16 consists of a motor timer device 17, 18 but it could also, in the spirit of the invention, be constituted by an electronic clock device in itself known.
  • the timer device 17, 18 has the advantage of being much lower in cost, but resetting it to zero can affect the flexibility of use of the oven.
  • the motorized timer device 17, 18 can be used without significant inconvenience for the user since the timer 18 is kept in the zero position until the locking temperature is reached, so that until this time, the user can cancel the pyrolysis cleaning command without the need to reset the clock device 16; it follows from this that it is not necessary to leave, on the front strip of the oven, control elements for resetting the clock device 16, and that the starting of the operation of Pyrolysis can be achieved with the single command of function switch 2.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Resistance Heating (AREA)
  • Baking, Grill, Roasting (AREA)
EP88402947A 1987-11-27 1988-11-24 Verfahren zum Regeln der Wärmezeit beim pyrolitischen Reinigen eines Backofens und Backofen zur Verwendung dieses Verfahrens Withdrawn EP0319377A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8716464A FR2623884B1 (fr) 1987-11-27 1987-11-27 Procede de controle du temps de chauffage pour un nettoyage par pyrolyse d'un four de cuisson, et four de cuisson mettant en oeuvre le procede
FR8716464 1987-11-27

Publications (1)

Publication Number Publication Date
EP0319377A1 true EP0319377A1 (de) 1989-06-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88402947A Withdrawn EP0319377A1 (de) 1987-11-27 1988-11-24 Verfahren zum Regeln der Wärmezeit beim pyrolitischen Reinigen eines Backofens und Backofen zur Verwendung dieses Verfahrens

Country Status (2)

Country Link
EP (1) EP0319377A1 (de)
FR (1) FR2623884B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321952B4 (de) * 1993-07-01 2004-05-27 BSH Bosch und Siemens Hausgeräte GmbH Herd mit pyrolitischer Selbstreinigung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3639727A (en) * 1970-07-28 1972-02-01 Westinghouse Electric Corp Positive temperature control door lock system
FR2148406A1 (de) * 1971-08-11 1973-03-23 Jega Friedrichsthaler Eisen
US3806700A (en) * 1972-10-30 1974-04-23 Tappan Co Balanced self-cleaning oven

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3639727A (en) * 1970-07-28 1972-02-01 Westinghouse Electric Corp Positive temperature control door lock system
FR2148406A1 (de) * 1971-08-11 1973-03-23 Jega Friedrichsthaler Eisen
US3806700A (en) * 1972-10-30 1974-04-23 Tappan Co Balanced self-cleaning oven

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321952B4 (de) * 1993-07-01 2004-05-27 BSH Bosch und Siemens Hausgeräte GmbH Herd mit pyrolitischer Selbstreinigung

Also Published As

Publication number Publication date
FR2623884B1 (fr) 1990-10-26
FR2623884A1 (fr) 1989-06-02

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