EP3495742A1 - Agencement pour l'auto-nettoyage d'un four - Google Patents

Agencement pour l'auto-nettoyage d'un four Download PDF

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Publication number
EP3495742A1
EP3495742A1 EP17206462.8A EP17206462A EP3495742A1 EP 3495742 A1 EP3495742 A1 EP 3495742A1 EP 17206462 A EP17206462 A EP 17206462A EP 3495742 A1 EP3495742 A1 EP 3495742A1
Authority
EP
European Patent Office
Prior art keywords
arrangement
cleaning
time
flue
cleaning operation
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.)
Withdrawn
Application number
EP17206462.8A
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German (de)
English (en)
Inventor
Irfan KARAZOR
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.)
Vestel Elektronik Sanayi ve Ticaret AS
Original Assignee
Vestel Elektronik Sanayi ve Ticaret AS
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 Vestel Elektronik Sanayi ve Ticaret AS filed Critical Vestel Elektronik Sanayi ve Ticaret AS
Priority to EP17206462.8A priority Critical patent/EP3495742A1/fr
Publication of EP3495742A1 publication Critical patent/EP3495742A1/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • This invention refers to an arrangement for self-cleaning a cooking space of an oven according to claim 1, and an oven according to claim 15.
  • Pyrolytic ovens have a timed cleaning cycle, usually ranging from two to four hours. During the cycle, the oven heats to between 450 and 550 degrees Celsius. The heat reduces the baked-on crust and grease to a powder that's easy to remove.
  • US Patent Publication No. US2002005401 discloses a method and apparatus for operating a self-cleaning oven in which a gas sensor, such as for measuring concentrations of CO gas, is located remote from, yet in gas communication with, an exhaust flue of the oven.
  • the gas sensor is located at the end of an outlet tube which extends from the exhaust flue.
  • a sample gas flow is provided to the gas sensor through the outlet tube to isolate the sensor from the heat of the oven and a filter device is located in the outlet tube for filtering the sample gas flow.
  • a valve may be provided at the inlet to the outlet tube.
  • the rate of change (slope) of successive readings of gas concentrations may be used to determine when the combustion of food material is complete, in order to terminate a self-cleaning cycle.
  • a count of lengths or numbers of baking cycles and broiling cycles performed since a last self-cleaning cycle can be kept, and a look up table consulted to determine a length of time required for a cleaning cycle.
  • a display is provided to advise the user that a cleaning mode is in operation and to inform the user of the amount of time remaining in the cleaning cycle.
  • PCT Patent Publication No. WO2004081456 discloses a pyrolytic self-oven comprising a cooking chamber, a heating device for heating the cooking chamber, an exhaust flue for discharging the gas induced by burning out of food residues, a sensor device for sensing the concentration of the discharging gas, an oven control device for receiving the output signals of the gas sensor and terminating the pyrolysis period wherein the oven control device receives sensor outputs continuously and stores thereof in a buffer having sufficient capacity for comparing the average value calculated by the oven control device with a recent data output value in the buffer so that the position of gas concentration amount is determined on the sensor output vs. time curve for subsequent determination of pyrolytic self-cleaning duration.
  • It is the object of the present invention is to provide an efficient mechanism for self-cleaning an oven.
  • An arrangement for self-cleaning a cooking space of an oven comprising a heating mechanism adapted to heat the cooking space on starting of a cleaning operation, for burning a leftover or dirt onto one or more walls of the oven, and to generate a flue composition comprising of at least a gas and an ash.
  • the arrangement comprising a flowrate apparatus adapted to be in line of flow of the flue composition, and to generate a processing data relating to the flow of the flue composition, or concentration of components of the flue composition, or a combination thereof, and a processing unit adapted to generate and send a start trigger for starting the cleaning operation to the heating mechanism, to receive and process the processing data, and to generate a control trigger for controlling the heating mechanism.
  • the heating mechanism is adapted to receive the start trigger and to start the heating of the cooking space, and to receive the control trigger and to vary intensity of heating of the cooking space.
  • the flowrate apparatus is adapted to generate the processing data related to the ash contents in the flue composition.
  • This embodiment is beneficial as it provides another way to measure significant contents of the flue composition, which shall more closely relate to combustion of the leftovers. It is to be noted that ash contents measurement in appropriate fashion may be an efficient way to measure the combustion of the leftovers, with minimum false positives. When the leftovers are combusted, they turn down into ash contents. If the ash contents identified to be minimal or nil, than it may mean that the leftover is completely combusted, and the oven is clean, thus the cleaning operation can be stopped.
  • the flowrate apparatus is adapted to generate the flow data related to viscosity of the flue composition.
  • This embodiment is helpful, as it provides another way to identify burning of the leftovers. More viscous the flue composition is, it refers to more of solid contents which may relate to the ash being present in substantial amount, and less viscous flue composition means lesser amount of solid/ ash contents in the flue composition. As the amount of ash relates to presence of the leftover, or still burning of the leftover, hence it means that the cleaning operation should be continued, and accordingly the processing unit shall generate the control trigger.
  • the oven comprises a flue exhaust extended from an opening of the cooking space to out of the cooking space to an outside environment and adapted to flow out the flue composition to the outside environment, and the flowrate apparatus is placed within the flue exhaust.
  • This embodiment is helpful, as it provides a way to keep the flowrate apparatus away from direct exposure to heat. This helps to use the flowrate apparatus made from a material which has lower durability in direct exposure to heat.
  • the flowrate apparatus is placed in proximity to the opening of the cooking space from where the flue exhaust extends to the outside environment.
  • This embodiment is helpful, as it provides most accurate processing data.
  • the flue composition flows through the flue exhaust, there may be chances that some of the solid particles, more specifically ash contents, may get stuck around walls of flue exhaust due to the mositure, or liquids present in the cooking space environment or the flue composition.
  • the generated processing data may not be accurate.
  • the arrangement comprises a valve in physical coupling to the flue exhaust, so as to regulate flow of the flue composition from the cooking space to the flue exhaust.
  • This embodiment is helpful, as regulation of the flow of the flue composition may be required to either safe guard the flue exhaust, or any elements, like the flowrate apparatus present in the flue exhaust. Sometimes this regulation of the flue composition flow may be required to provide a breathable outside environment or proper generation of the processing data.
  • the flue composition flows through a flow channel formed due to at least a pressure or a temperature difference inside the cooking space and the outside environment, and wherein the flow rate apparatus is placed in the flow channel.
  • This embodiment is beneficial, as it provides a proper placement of the flowrate apparatus to always be in the flow channel so that it can generate accurate processing data.
  • the arrangement comprises a filtering device placed in the flow channel after the flowrate apparatus and adapted to filter out at least the ash contents from the flue composition.
  • This embodiment is beneficial as it helps to clean the flue composition from the ash content so that spreading of the ash contents outside the oven can be avoided.
  • the arrangement comprises a memory device adapted to receive and store the processing data, wherein the processing unit is adapted to retrieve previously stored processing data and to compare the previously stored processing data with the processing data recently received from the flowrate apparatus, to determine the amount of leftover still left to be combusted, and to generate the control trigger based on such determination.
  • This embodiment is helpful, as it provides another mechanism to determine the leftover still remaining to be combusted, and hence regulating the heat mechanism accordingly, by either changing the heating level, or stopping the heating mechanism, in case if it is determined that the leftover is entirely combusted.
  • the arrangement comprises a time recorder adapted to record a time for each of the cleaning operations and to record the time in a lookup table in the memory device.
  • the embodiment is beneficial, as this helps to keep a track of the time taken for each of the cleaning operations.
  • the arrangement comprises a cooking recorder adapted to record an amount of cooking data is carried out before a cleaning operation and to record the amount of cooking data against the time of the cleaning operation in the lookup table in the memory device.
  • the amount of cooking can refer to a count of lengths or numbers of baking cycles and broiling cycles.
  • the processing unit is adapted to receive the amount of cooking data from the cooking recorder, to access and process the amount of cooking data and corresponding time stored in the lookup table, and to predict a cleaning time required for the cleaning operation.
  • This embodiment is helpful, as it provides a mechanism to predict a time required for a particular cleaning operation.
  • the processing unit is adapted to set the time of the cleaning operation for the predicted cleaning time initially, and to change the predicted cleaning time of the cleaning operation to an additional time based on processing of the processing data.
  • This embodiment is helpful, as it provides a predefined running of the cleaning operation, and to extend the cleaning operation, if it is required.
  • the processing unit is adapted to generate a display trigger related to at least running of the cleaning operation, the predicted cleaning time for the cleaning operation predicted by the processing unit, and the additional time changed by the processing unit for the cleaning operation.
  • the arrangement further comprises a display adapted to receive the display trigger from the processing unit and adapted to display at least a cleaning indication related to running of the cleaning operation, or a time indication related to the time required or left for completing the cleaning operation based on the predicted cleaning time or the additional time, or a combination thereof.
  • This embodiment is helpful, as it displays the running of the cleaning operation, and the time required or left for completing the cleaning operation. In this way a user can plan his next cooking slot.
  • the present invention focuses on self-cleaning of an oven. While cooking the food, many times, either due to spurting or exposed parts of the extensive size food unit, the food gets stuck onto the walls, and further leftover after the cooking operation is completed. In oven, the cleaning is carried out by through a self-heating process, where the leftover food is combusted into ashes.
  • the invention focuses on making this self-cleaning process efficient, so that the cleaning operation can be completed timely, and with complete combustion of the leftover.
  • a pyrolytic oven cleans itself by blasting its interior with super-high temperatures.
  • the oven heats up to an extremely high temperature (approximately 500°C), and uses a combination of heat and pressure to reduce any food splashes on its interior to a fine ash that can be easily wiped away once the oven has cooled down, with no need for harsh oven-cleaning chemicals or intense scrubbing. This varies depending on how dirty the oven is, but the average pyrolytic cleaning cycle goes for 1-2 hours, plus the time it takes for the oven to cool back down.
  • Fig. 1 shows schematics of an arrangement 1 provided with the oven 3 to clean a cooking space 2 of the oven 3.
  • the oven 3 has a heating mechanism 4 which is generally used for cooking food inside the oven 3. Same heating mechanism 4 is also used for heating the cooking space 2 to a higher temperature, which is higher than the temperature required for cooking, so that a leftover of the food which has been stuck on walls of the cooking space 2 is combusted. On combustion of the leftover, it turns into a flue composition 7, which includes at least ash and a gas.
  • the flue composition 7 can also include water vapor.
  • the arrangement 1 includes a flowrate apparatus 8 which is placed in the cooking space 2, or in any location outside the cooking space 2, however to be in flow of the flue composition 7.
  • the cooking space 2 is provided with an opening from where a flue exhaust is extended out, and the flue composition flows through the flue exhaust to an outside environment.
  • the flowrate apparatus 8 is placed in proximity to the opening of the cooking space within the flue exhaust.
  • the flowrate apparatus 8 can be placed at any other place in the flue exhaust.
  • the flowrate apparatus 8 need not be placed in the flow of the flue composition 7, but in an environment which contains flue composition 7 generated by combustion of the leftover.
  • the flowrate apparatus 8 when it gets in contact to the flue composition 7, it generates a processing data which relates to the flow of the flue composition, or concentration of the components of the flue composition 7, or both.
  • the processing data 9 relates to a percentage, volume or weight of the ash contents in the flue composition 7.
  • the processing data 9 relates to viscosity of the flue composition 7. Viscosity of the flue composition 7 also gives a fair evaluation of the solid or semi-solid components in the flue composition 7. These solid or semi-solid components generally shall be indicative of presence of ash in the flue composition. More viscosity represents more ash contents in the flue composition 7, which means still burning of the leftover.
  • the arrangement 1 also includes a processing unit 10 which generate a start trigger 11 when the self-cleaning operation of the oven 2 is required to be started, and the start trigger 11 is also sent to the heating mechanism 4, which on receiving the start trigger 11 switches on the heating mechanism 4.
  • the processing unit 10 receives and processes the processing data 9 and generates a control trigger 12.
  • the heating mechanism 4 receives the control trigger 12 and regulates heating of the cooking space 2.
  • the control trigger 12 can be for either switching off the heating mechanism 4, in case processing of processing data refers to complete combustion of the leftover.
  • the control trigger 12 can also be for reducing or increasing intensity of the heat for quickening or slowing of heating of the cooking space 2.
  • the arrangement 1 also includes a memory device 18 which receives the processing data 9 from the processing unit 10 and store the processing data 9.
  • the processing unit 10 retrieves previously stored processing data 9 and compares the previously stored processing data 9 with the processing data 9 recently received from the flowrate apparatus 8. Further based on such comparison of the processing data 9, the processing unit 10 determines an amount of leftover still left to be combusted, and further generate the control trigger 12 based on such determination.
  • the processing unit 10 need not compare previously generated processing data 9 and recently generated processing data 9, rather the processing unit 10 generated the control trigger 12 based on freshly generated processing data 9 by the flowrate apparatus 8.
  • the memory device 18 also stores a lookup table 21 which stores a time 20 taken for each of the cleaning operations and an amount of cooking data 23 relating to amount of cooking is done before each of the cleaning operations.
  • the lookup table 21 can include either of the time 20 or the amount of cooking data 23 stored in the lookup table.
  • the processing unit 10 receives the amount of cooking data 23 from the cooking recorder 22 and also accesses and processes the amount of cooking data 23 and corresponding time 20 stored in the lookup table 21. Based on such processing, the processing unit 10 predicts a cleaning time 24 required for the cleaning operation. In one embodiment, the prediction of the cleaning time 24 is not required, rather the processor keeps on processing the processing data 9 to generate the control trigger 12.
  • the processing unit 10 sets the time of the cleaning operation for the predicted cleaning time 24 initially, and changes the predicted cleaning time 24 of the cleaning operation to an additional time 25 based on processing of the processing data 9.
  • the prediction regarding the cleaning time 24 from the processing unit 10 is accurate, and the processing unit 24 need not change the predicted cleaning time 24 to the additional cleaning time 25.
  • the arrangement 1 also includes a display 27.
  • the processing unit 10 generates a display trigger 26 which relates to either running of the cleaning operation, or the predicted cleaning time 24 for the cleaning operation predicted by the processing unit 10, or the additional time 25 changed by the processing unit 10 for the cleaning operation, or both.
  • the display 27 receives the display trigger 26 from the processing unit 10 and displays a cleaning indication 28 related to running of the cleaning operation, or a time indication 29 related to the time required or left for completing the cleaning operation based on the predicted cleaning time 24 or the additional time 25, or both.
  • the display 27 is not provided, and the arrangement just runs the self-cleaning operation, and do not indicate running of it. In such cases, a user is kept away from using the oven 3 by just locking a door of the oven, and sound or heat of running of the heating mechanism 4.
  • the arrangement 1 includes a time recorder 19 which records the time 20 for each of the cleaning operations and record the time 20 in the lookup table 21 in the memory device 18.
  • the time recorder 19 is not provided.
  • the arrangement 1 also includes a cooking recorder 22 records the amount of cooking data 23 carried out before a cleaning operation and stores the amount of cooking data 23 against the time 20 of the cleaning operation in the lookup table 21 in the memory device 18.
  • a cooking recorder 22 records the amount of cooking data 23 carried out before a cleaning operation and stores the amount of cooking data 23 against the time 20 of the cleaning operation in the lookup table 21 in the memory device 18.
  • the processing unit 10 just processes the processing data 9 for generating the control trigger 12, and not the time 20 for the cleaning operation or the amount of cooking data 23 associated to the time 23, the time recorder 19 is not provided.
  • Fig. 2 shows a sectional view of some parts of an oven 3 where self-cleaning operation is being carried out.
  • the oven 3 has a cooking space 2 with walls 6. On the walls, the leftover 5 is stuck which may have stuck due to spurting of the food while cooking.
  • the oven 3 also has a flue exhaust 13 which extends from an opening 14 of the cooking space 2 to an outside environment 15.
  • a flowrate apparatus 8 is placed in the flue exhaust.
  • the flowrate apparatus 8 is placed near to the opening 14 of the cooking space 2 from where the flue exhaust extends from. In an alternate embodiment, the flowrate apparatus 8 can be placed at any other location in the flue exhaust 13, or even in the cooking space 2 itself.
  • a filtering device 17 is also provided which is placed ahead of the flow rate apparatus 8 in the flue exhaust 13.
  • the flowrate apparatus When the self-cleaning operation begins, the leftover 5 starts to burn, and due to such burning of the leftover 5, a flue composition 7 generates which flows out of the flue exhaust 13.
  • the flowrate apparatus When the flue composition 7 comes in contact with the flowrate apparatus, the flowrate apparatus generates a processing data which relates to flow of the flue composition 7, or concentration of components of the flue composition 7, or both.
  • the processing data is processed further by a processing unit for controlling the heating mechanism.
  • the flue composition 7 moves ahead through the flue exhaust 13, after passing through the flowrate apparatus 8, the flue composition 7 is filtered by the filtering device 17 to remove ash contents and/or any other content of the flue composition 7.
  • the filtering device 17 is not provided, and the flue composition 7 is allowed to move out into the outside environment 15 directly which may be inconvenient due to spreading of ashes, grease or other components of the flue composition 7 into the outside environment 15.
  • the oven 3 is also provided with a valve 16 which is provided in physical coupling with the flue exhaust 13, and allows to regulate flow of the flue composition 7 into the flue exhaust 13.
  • the valve 16 is placed near to the opening 14 of the cooking space 2, so that the flue composition 7 is regulated even before entering the flue exhaust 13. In one embodiment, the valve 16 is not provided, where such regulation of flow of the flue composition 7 is not desired.
  • Fig. 3 shows a flow chart depicting functioning of the self-cleaning operation of the oven, according to an embodiment of the invention.
  • the self-cleaning operation is started through the start trigger.
  • the cleaning time is predicted for cleaning operation, and in step 103 the cleaning time and starting of cleaning operation is displayed on the display.
  • the door of the oven is looked, so as to be inaccessible by a user of the oven while the cleaning operation is running.
  • the heating mechanism is started to heat the cooking space of the oven on receiving the start trigger.
  • the processing unit checks whether the predicted time has reached, and if the predicted time has not reached, it keeps on processing the processing data in step 107.
  • the processing unit Based on processing of the processing data, the processing unit identifies if the cleaning of the oven is completed in step 108. And, in case the cleaning is completed, the processing unit generates a control trigger to stop the heating mechanism, and sends it to the heating mechanism in step 110, and the self-cleaning operation stops. In step 108, if the processing unit identified that cleaning is not completed, then the processing unit changes the predicted cleaning time with additional cleaning time in step 109. In step 106, if the predicted time is completed than the processing unit changes the predicted time to an additional time in step 109 to continue the cleaning operation.
  • the present invention provides an arrangement 1 for self-cleaning a cooking space 2 of an oven 3.
  • the oven includes a heating mechanism 4, which heats the cooking space 2 on starting of a cleaning operation, and burns a leftover 5 of food onto one or more walls 6 of the oven 3, and generates a flue composition 7 comprising of at least a gas and an ash.
  • the arrangement 1 further includes a flowrate apparatus 8 and a processing unit 10.
  • the flowrate apparatus 8 is placed to be in line of flow of the flue composition 7, and generates a processing data 9 relating to flow of the flue composition 7, or concentration of components of the flue composition 7, or combination thereof.
  • the processing unit 10 generates and sends a start trigger 11 for starting the cleaning operation to the heating mechanism 4, receives and processes the processing data 9, and generates a control trigger 12 for controlling the heating mechanism 4.
  • the heating mechanism 4 receives the start trigger 11 and starts the heating of the cooking space 2, and receives the control trigger 12 and varies intensity of heating of the cooking space 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)
  • Electric Stoves And Ranges (AREA)
EP17206462.8A 2017-12-11 2017-12-11 Agencement pour l'auto-nettoyage d'un four Withdrawn EP3495742A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17206462.8A EP3495742A1 (fr) 2017-12-11 2017-12-11 Agencement pour l'auto-nettoyage d'un four

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17206462.8A EP3495742A1 (fr) 2017-12-11 2017-12-11 Agencement pour l'auto-nettoyage d'un four

Publications (1)

Publication Number Publication Date
EP3495742A1 true EP3495742A1 (fr) 2019-06-12

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3669090A (en) * 1969-08-18 1972-06-13 Anton Ladislaus Jung Method of cleaning an oven with internal air circulation
EP0528250A2 (fr) * 1991-08-19 1993-02-24 BOSCH-SIEMENS HAUSGERÄTE GmbH Procédé automatisable de nettoyage par pyrolyse
US6232584B1 (en) * 1999-12-15 2001-05-15 Whirlpool Corporation System for controlling a self cleaning oven having catalyst temperature control
US20010052852A1 (en) * 2000-06-14 2001-12-20 Andrian Kouznetsov Apparatus and method using smoke and/or gas sensing in cooking devices
EP1172612A1 (fr) * 2000-07-12 2002-01-16 Whirlpool Corporation Système pour commander le temps d'un cycle de nettoyage d'un four
WO2004076928A2 (fr) * 2003-02-21 2004-09-10 Middleby Corporation Four autonettoyant
WO2004081456A1 (fr) 2003-03-10 2004-09-23 Gunkol Gunes Enerjisi Ve Klima San. A.S. Four et son capteur remplissant une fonction pyrolytique

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3669090A (en) * 1969-08-18 1972-06-13 Anton Ladislaus Jung Method of cleaning an oven with internal air circulation
EP0528250A2 (fr) * 1991-08-19 1993-02-24 BOSCH-SIEMENS HAUSGERÄTE GmbH Procédé automatisable de nettoyage par pyrolyse
US6232584B1 (en) * 1999-12-15 2001-05-15 Whirlpool Corporation System for controlling a self cleaning oven having catalyst temperature control
US20010052852A1 (en) * 2000-06-14 2001-12-20 Andrian Kouznetsov Apparatus and method using smoke and/or gas sensing in cooking devices
EP1172612A1 (fr) * 2000-07-12 2002-01-16 Whirlpool Corporation Système pour commander le temps d'un cycle de nettoyage d'un four
US20020005401A1 (en) 2000-07-12 2002-01-17 Meyer Robert William System for controlling the duration of a self-clean cycle in an oven
WO2004076928A2 (fr) * 2003-02-21 2004-09-10 Middleby Corporation Four autonettoyant
WO2004081456A1 (fr) 2003-03-10 2004-09-23 Gunkol Gunes Enerjisi Ve Klima San. A.S. Four et son capteur remplissant une fonction pyrolytique

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