EP1557612B1 - Vorrichtung zum Einbringen von Feuchte in einen Ofen für seine Reinigung - Google Patents

Vorrichtung zum Einbringen von Feuchte in einen Ofen für seine Reinigung Download PDF

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Publication number
EP1557612B1
EP1557612B1 EP20040001436 EP04001436A EP1557612B1 EP 1557612 B1 EP1557612 B1 EP 1557612B1 EP 20040001436 EP20040001436 EP 20040001436 EP 04001436 A EP04001436 A EP 04001436A EP 1557612 B1 EP1557612 B1 EP 1557612B1
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EP
European Patent Office
Prior art keywords
oven
oven cavity
cavity
temperature
temp
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.)
Expired - Lifetime
Application number
EP20040001436
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English (en)
French (fr)
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EP1557612A1 (de
Inventor
Ermanno Buzzi
John Doyle
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.)
Whirlpool Corp
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Whirlpool Corp
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Publication date
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Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to EP20040001436 priority Critical patent/EP1557612B1/de
Priority to ES04001436T priority patent/ES2276174T3/es
Priority to DE602004003783T priority patent/DE602004003783T2/de
Publication of EP1557612A1 publication Critical patent/EP1557612A1/de
Application granted granted Critical
Publication of EP1557612B1 publication Critical patent/EP1557612B1/de
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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
    • F24C14/005—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning using a cleaning liquid

Definitions

  • the present invention relates to a method of cleaning an oven, and more particularly to a method of providing moisture into a oven cavity to effect cleaning.
  • ovens feature a high-temperature "self-cleaning" cycle during which baked-on foods are pyrolyzed (i.e., decomposed) to carbon ash residue that can be wiped from the interior surfaces of the oven once it cools.
  • pyrolytic heating cycles must maintain the temperature within the oven cavity above about 480 DEG C (900 DEG F) for a period of approximately from 60 minutes to up to four hours. In general, this is achieved by the selection through the range's controls of a "self-clean" cycle.
  • Initiation of this cycle typically sets a high control temperature for the range, locks the oven door at some predetermined time or temperature and proceeds to heat the cavity to a relatively high temperature for a predetermined time before ending the cycle, allowing cooling to occur and then releasing the door lock as an end to the cycle.
  • a method for facilitating the cleaning of ovens with the introduction of water or steam in the oven cavity is disclosed in DE 28442771 and in US 2003/0172962.
  • Another method for facilitating the cleaning of ovens involves the use of an enamel cover coat from which baked-on foods can be removed without the need for pyrolysis, catalytic panels or highly alkaline cleaners.
  • This composition is disclosed in European Pat. Application EP 1 167 310 A1, to Ferro France S.A.R.L. Using this composition, it is possible to remove most baked-on foods from the enamel cover coat using warm water.
  • the present invention is directed to the application of moisture or water in an oven cavity for the purposes of cleaning the oven cavity.
  • GB 939320 discloses a method for cleaning household ovens by means of steam and ammonia gas comprises placing in the oven a container containing a material which reacts with water to yield ammonia and steam and adding water to the material.
  • these methods are not well suited for providing the optimum application of humidity in an oven cavity, in combination with the enamel coating of EP 1 167 310 A1, to result in the best cleaning performance and best preservation of the enamel coating.
  • heat and moisture are introduced into an oven for purposes of cleaning an oven cavity.
  • the oven cavity includes cavity walls and heating elements.
  • the heat and moisture are introduced into the oven in accord with a method that is initiated when the oven user selects an oven cleaning cycle. Initially, the temperature of the oven cavity is sensed to determine if the oven is below a predetermined start temperature TEMP start . Upon confirmation that the oven is below the predetermined start temperature TEMP start , heat and moisture are introduced into the oven cavity until the oven cavity reaches a predetermined maximum temperature TEMP max , at which temperature the temperature of the oven cavity walls are less than 100 Celsius and the relative humidity within the oven cavity approaches 100%.
  • Heat and moisture can be introduced by energizing the heaters and evaporating water that has been added into the oven cavity or alternatively, by use of a steam generator or through a combination of the two.
  • the oven cavity is subsequently maintained at the predetermined maximum temperature TEMP max for a predetermined period of time T maintain .
  • T maintain the oven cavity is allowed to cool to a predetermined, safe clean temperature TEMP clean whereupon a signal is provided to alert the user that the cleaning cycle is complete.
  • the invention may be practiced by use of a flame and heat resistant sponge, which prior to the start of the oven cleaning cycle, the user places within the oven cavity and pours or adds water to the sponge.
  • the oven cavity may include a vent opening which is partially obstructed to reduce the cross sectional area of the vent opening during the oven cleaning cycle.
  • a drain pipe may also be provided extending from the bottom wall of the oven cavity for draining water from the oven cavity at the conclusion of the oven cleaning cycle.
  • the present invention relates to a system for cleaning an oven through the introduction of heat and moisture during an oven cleaning cycle.
  • This invention may be practiced on either an electric or gas oven.
  • FIG. 1 illustrates a cooking appliance 10 having an oven cavity 12.
  • the oven cavity 12 is defined by a plurality of walls, and in particular is defined by side walls 14 (and 16), top wall 18, rear wall 20 and a bottom wall or cavity floor 22.
  • the oven cavity 12 is also provided with a hinged door 24 for closing the cavity opening.
  • a vent opening 26 is provided in the top wall 18 to allow for expansion of gas within the cavity 12 and in the case of a gas oven, the vent opening 26 provides an exhaust opening for combustion products.
  • the cooking appliance 10 includes a plurality of control elements as indicated in FIG. 2.
  • a controller 30 is provided interconnected with a user interface 32.
  • the user interface 32 may be any type of interface such as a touch screen, knobs, sliders, buttons, speech recognition, etc, to allow a user to input the desired oven operation.
  • the user interface 32 allows selection of the mode of operation of the oven between an OFF mode, a bake mode, a broil mode and a clean mode of operation. Additionally, the user may select a desired oven temperature within the oven cavity 12.
  • a display 34 may provide feedback to the user as to the status of the oven.
  • a timer 36 is also associated with the controller to allow timed operation of the oven. Although the user interface 32, display 34 and timer 36 are illustrated as three separate elements in FIG. 2, these elements may alternatively be incorporated into a single interface or display to provide for ease of use.
  • a broiling element 38 and a baking heating element 40 Disposed within the cavity 12 of the oven 10 are a broiling element 38 and a baking heating element 40. These elements may be electric heat elements or gas burners or a combination of the two.
  • a fan 42 may be provided in the vicinity of the heating element 40 to circulate air within the oven cavity 12. The fan may be coupled with a ring heating element 43.
  • a temperature sensor 44 positioned within the cavity 12 of the oven 10 is a temperature sensor 44, such as, for example, a standard oven temperature sensing probe.
  • a door lock 46 may optionally be provided to lock the oven door during a self clean cycle, as will be explained hereinbelow.
  • the present invention is directed toward the cleaning of ovens wherein the oven cavity is provided with an easy-to-clean (ETC) enamel cover coat from which baked-on foods can be removed without the need for pyrolysis, catalytic panels or highly alkaline cleaners.
  • ETC easy-to-clean
  • An example of this type of composition is disclosed in European Pat. Application EP 1 167 310 Al, to Ferro France S.A.R.L. Using this composition, it is possible to remove most baked-on foods from the enamel cover coat using warm water.
  • the inventors have discovered that there are preferred temperature ranges and humidity ranges to which food soils must be exposed in order to activate the cleaning process and also maintain the effectiveness the ETC cover coat. This methodology and process is greatly preferable over an uncontrolled method of applying moisture.
  • step 45 it is shown that the user initially selects the self clean cycle through use of the user interface 32.
  • the controller 30 checks if the temperature of the oven TEMP start is less than the preferred starting temperature, step 47, which is preferably 50 Celsius and not higher than 100 Celsius. If the temperature is greater than the desired start temperature, the display provides a signal or warning to the user to wait for oven cooling before initiating the oven cleaning cycle to allow for a significant thermal contraction difference between cooked food-stuff and the enamel surface. After the oven cavity 12 is at or below the desired start temperature, the heat and water are introduced into the oven cavity 12.
  • This may be accomplished by energizing the heaters 38, 40, 43 and evaporating water that has been added ---in step 48--- into the oven cavity 12 or alternatively, by use of a steam generator, as discussed hereinbelow, or through a combination of the two methods.
  • the total amount of water used per cleaning cycle varies between 200cc (for a small oven and using steam injection) and 1000cc (for a large oven, with water poured on the cavity floor).
  • the water may be manually poured into a depression 50 provided on the bottom wall or cavity floor 22 of the oven 10.
  • a heat and flame resistant sponge 52 (FIG. 1) may be placed on the bottom wall 22 of the oven and the water may be poured on the sponge 52 - such that the sponge holds, distributes evenly and retains the moisture.
  • a sponge may be formed from Zirconia Mullite Aluminum foam.
  • the use of a sponge along the bottom wall 22 may provide further benefits in that splashing is reduced, evaporation is promoted due to the increased water surface area, and condensing water is readily reclaimed for further and repeated evaporation.
  • the water may also be automatically introduced as described hereinbelow.
  • step 54 where water has been added into a depression 50 in the bottom wall 22 of the oven cavity 12 prior to the start of the cycle, the controller 30 operates to pause or delay the start of the oven to allow the moisture a predetermined soak time T soak .
  • the delay time or soak time for liquid water is preferably 10 minutes although no delay is set if water is injected as steam (as explained hereinbelow).
  • step 55 it is shown that the cross sectional area of the vent opening 26 may be optionally reduced. This may be accomplished by energizing an actuator 59 to partially or completely obstruct the vent opening 26. In this way, it is possible to reduce the amount of steam and heat that may escape from the oven cavity 12 during the clean cycle.
  • steps 53 and 56 water vapor and heat are generated or steam is introduced into the oven cavity 12.
  • this can be accomplished by introducing water (step 48) and energizing the heating elements of the oven to begin heating the oven cavity 12 or, alternatively, through the introduction of steam into the oven cavity 12, or by a combination of the two.
  • the oven cavity 12 is heated up to a predetermined TEMP max which is preferably approximately 90 Celsius.
  • the heating sequence will in no case allow the oven wall surface temperatures to exceed 100 Celsius.
  • the fan 42 may be energized such that water vapor is well distributed within the oven cavity 12.
  • the oven cavity 12 is maintained at this temperature for a predetermined period of time T maintain which is preferably 30 minutes but may be within the range of 5 minutes to 1 hour, steps 58 and 60. During this period of time, water vapor is allowed to condense on the oven walls and soak into the food soils that may be on the oven walls.
  • the oven heating is stopped, step 62.
  • the temperature within the oven is monitored via the temperature sensor 44 and then after the oven reaches a predetermined safe, clean temperature, TEMP clean , which is preferably less than 40 Celsius but at least less than 50 Celsius, the display 34 signals to the user that the oven is clean, step 64 and 66.
  • the oven door may also be unlocked at this time.
  • This TEMP clean temperature has to be reached also to promote the differential thermal concentration between cooked food-stuffs and enamel thereby promoting separation of the soils from the enamel and facilitating easy cleaning.
  • the user wipes the walls of the oven cavity with a sponge, rag, or other suitable cleaning material to remove the soils from the oven walls and to mop or wipe up the condensed moisture on the oven walls. If a heat and flame resistant sponge 52 is used, this sponge will hold any excess moisture remaining at the end of the clean cycle.
  • the oven may be also provided with a drain pipe 70 having a drain opening 72 provided in the cavity floor 22 of the oven cavity 12, as shown in FIG. 5.
  • a valve 74 may be provided for allowing the draining of the water to an outlet 76 from the cavity floor 22 after the self clean cycle. The valve 74 may be controlled automatically by the controller 30 at the end of the self clean cycle or may be activated by the user through operation of a button or other control element.
  • FIG. 6 An alternative method of introducing water into the oven cavity is shown in FIG. 6.
  • the oven 10 is provided with a steam generator 78 including a steam generating tank 80.
  • a heating element 82 is provided in the tank 80.
  • An inlet 83 and outlet 86 are provided for allowing the user to fill and drain, respectively, the tank 80 with water.
  • the heating element 82 is energized and the water is heated to generate steam.
  • the steam exits the tank 80 from steam outlet 84.
  • FIG. 7 illustrates the concept of a removable steam generator 78', similar to FIG. 6 but including an electrical power plug 88 which may plug into an electrical power plug provided within the oven cavity 12.
  • the steam generator 78' includes a stream generating tank 80', a heating element, a water inlet 83' and water outlet 86'.
  • FIG. 8 illustrates yet another alternative method of introducing water into the oven cavity 12.
  • the oven 10 is provided with a steam generator 90 including a tank 91 which is mounted outside of the oven cavity 12, inside the oven structure.
  • a heating element (not shown) and a water inlet 92 and water outlet 94 are provided for allowing the user to fill and drain, respectively, the tank 90 with water.
  • the heating element is heated to generate steam which enters the oven cavity through a steam injection port or outlet 96.
  • a steam generating device it may be possible to omit the use of the oven heating elements during the self clean cycle. As can be seen from FIGS.
  • a steam generator in combination with an oven for the purpose of generating steam to be used during a cleaning cycle.
  • a steam generator may be mounted inside the cavity 12, outside the cavity 12 or in the door 24 of an oven (FIG 9).

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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)
  • Cleaning By Liquid Or Steam (AREA)
  • Electric Ovens (AREA)
  • Cookers (AREA)
  • Electric Stoves And Ranges (AREA)

Claims (14)

  1. Ein Verfahren zum Optimieren des Einführens von Hitze und Feuchtigkeit in einen Ofen für Zwecke einer Reinigung einer Ofenkavität, wobei die Ofenkavität (12) bzw. der Ofenraum Kavitätswände (14, 16, 18, 20, 22) aufweist, Heizelemente (38, 40, 43) innerhalb der Ofenkavität (12) bereitgestellt werden, und das Verfahren durch den Ofenbenutzer initiiert wird, der einen Ofenreinigungszyklus auswählt, dadurch gekennzeichnet, dass
    die Temperatur der Ofenkavität (12) detektiert wird, um zu bestimmen, ob der Ofen unter einer vorbestimmten Starttemperatur (TEMPstart) ist,
    bei Bestätigung, dass der Ofen unter der vorbestimmten Starttemperatur (TEMPstart) ist, Hitze und Feuchtigkeit in die Ofenkavität (12) eingeführt werden, bis die Ofenkavität eine vorbestimmte Maximaltemperatur (TEMPmax) erreicht, wobei bei der Temperatur die Temperatur der Ofenkavitätswände geringer ist als 100 Celsius und die relative Feuchtigkeit innerhalb der Ofenkavität 100% erreicht,
    die Ofenkavität (12) nachfolgend bei der vorbestimmten. Maximaltemperatur (TEMPmax) für eine vorbestimmte Zeitdauer (Tmaintain) gehalten wird, und
    nach der vorbestimmten Zeitdauer (Tmaintain), der Ofenkavität (12) erlaubt wird, sich auf eine vorbestimmte, sichere Reinigungstemperatur (TEMPclean) abzukühlen, worauf ein Signal bereitgestellt wird, um den Benutzer zu alarmieren, dass der Reinigungszyklus beendet ist.
  2. Ein Verfahren, wie in Anspruch 1 beansprucht, dadurch gekennzeichnet, dass die vorbestimmte Starttemperatur (TEMPstart), ungefähr 50 Celsius ist.
  3. Ein Verfahren, wie in Anspruch 2 beansprucht, dadurch gekennzeichnet, dass die vorbestimmte Maximaltemperatur (TEMPmax) ungefähr 90 Celsius ist.
  4. Ein Verfahren, wie in Anspruch 3 beansprucht, dadurch gekennzeichnet, dass die vorbestimmte Zeitdauer (Tmaintain) zwischen fünf (5) Minuten und sechzig (60) Minuten ist.
  5. Ein Verfahren, wie in Anspruch 4 beansprucht, dadurch gekennzeichnet, dass die vorbestimmte, sichere Reinigungstemperatur (TEMPclean) ungefähr 50 Celsius ist.
  6. Ein Verfahren, wie in Anspruch 1 beansprucht, dadurch gekennzeichnet, dass der Benutzer Wasser in die Ofenkavität (12) gießt oder hinzufügt und während dem Ofenreinigungszyklus ein oder mehrere der Ofenheizelemente (38, 40, 43) erregt werden, um dabei Hitze und Feuchtigkeit in die Ofenkavität (12) einzuführen, um die Ofenkavitätstemperatur zu erhöhen auf (TEMPmax).
  7. Ein Verfahren, wie in Anspruch 6 beansprucht, dadurch gekennzeichnet, dass der Benutzer Wasser in die Ofenkavität (12) hineingießt oder hinzufügt, und bei Initiierung des Ofenreinigungszyklus es eine Verzögerungszeit (Tsoak) gibt, vor der Erregung eines oder mehrerer Der Heizelemente (38, 40, 43).
  8. Ein Verfahren, wie in Anspruch 6 beansprucht, dadurch gekennzeichnet, dass ein Dampferzeuger (78, 78', 90) in der Ofenkavität bereitgestellt wird, zum Einführen von Dampf in die Ofenkavität (12), um dem einen oder den mehreren Heizelementen zu helfen, die Ofenkavitätstemperatur auf (TEMPmax) zu erhöhen.
  9. Ein Verfahren, wie in Anspruch 6 beansprucht, dadurch gekennzeichnet, dass der Benutzer Wasser in eine Vertiefung (50), bereitgestellt in dem Kavitätsboden (22), hineingießt oder hinzufügt.
  10. Ein Verfahren, wie in Anspruch 6 beansprucht, dadurch gekennzeichnet, dass vor dem Start des Ofenreinigungszyklus der Benutzer einen Schwamm (52) innerhalb der Ofenkavität platziert und Wasser auf den Schwamm aufgießt oder hinzufügt.
  11. Ein Verfahren, wie in Anspruch 1 beansprucht, dadurch gekennzeichnet, dass die Ofenkavität eine Lüfteröffnung (26) enthält, und die Lüfteröffnung teilweise versperrt bzw. überdeckt ist, um die Querschnittsfläche der Lüfteröffnung während dem Ofenreinigungszyklus zu verringern.
  12. Ein Verfahren, wie in Anspruch 1 beansprucht, dadurch gekennzeichnet, dass Dampf eingeführt wird in die Ofenkavität (12) zum Einführen von Hitze und Feuchtigkeit in die Ofenkavität (12).
  13. Ein Verfahren, wie in Anspruch 1 beansprucht, dadurch gekennzeichnet, dass ein Dampferzeuger (78, 78', 90) verbunden ist mit der Ofenkavität (12) zum Einführen von Hitze und Feuchtigkeit in die Ofenkavität (12).
  14. Ein Verfahren, wie in Anspruch 1 beansprucht, dadurch gekennzeichnet, dass ein Abflussrohr (70) bereitgestellt wird, das sich von der Bodenwand (22) der Ofenkavität (12) erstreckt, um Wasser von der Ofenkavität am Ende des Ofenreinigungszyklus auszulassen.
EP20040001436 2004-01-23 2004-01-23 Vorrichtung zum Einbringen von Feuchte in einen Ofen für seine Reinigung Expired - Lifetime EP1557612B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20040001436 EP1557612B1 (de) 2004-01-23 2004-01-23 Vorrichtung zum Einbringen von Feuchte in einen Ofen für seine Reinigung
ES04001436T ES2276174T3 (es) 2004-01-23 2004-01-23 Sistema para introducir humedad en un horno para su limpieza.
DE602004003783T DE602004003783T2 (de) 2004-01-23 2004-01-23 Vorrichtung zum Einbringen von Feuchte in einen Ofen für seine Reinigung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20040001436 EP1557612B1 (de) 2004-01-23 2004-01-23 Vorrichtung zum Einbringen von Feuchte in einen Ofen für seine Reinigung

Publications (2)

Publication Number Publication Date
EP1557612A1 EP1557612A1 (de) 2005-07-27
EP1557612B1 true EP1557612B1 (de) 2006-12-20

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DE (1) DE602004003783T2 (de)
ES (1) ES2276174T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4199792A4 (de) * 2020-08-20 2024-10-23 Arcelik As Steuerungsverfahren für einen ofen

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US7487716B2 (en) 2002-02-19 2009-02-10 Alto-Shaam, Inc. Rotisserie oven
KR20090030974A (ko) * 2007-09-21 2009-03-25 삼성전자주식회사 조리장치 및 그 스팀청소 제어방법
KR101411074B1 (ko) 2009-04-20 2014-06-27 엘지전자 주식회사 조리기기 및 그의 제어방법
IT1397245B1 (it) * 2009-05-07 2013-01-04 Filippi Srl Forno pirolitico multifunzione assistito a vapore
US8373098B2 (en) * 2010-12-13 2013-02-12 General Electric Company Oven appliance cleaning system using heat and steam cycle
EP2708819B1 (de) 2012-09-17 2017-06-14 ELECTROLUX PROFESSIONAL S.p.A. Selbstreinigender Gargerät für Gargüter
EP2944881B1 (de) 2014-05-16 2020-03-25 Electrolux Appliances Aktiebolag Dampfofenreinigungsverfahren
CN111996770B (zh) * 2020-08-25 2023-06-13 广州视源电子科技股份有限公司 衣物护理机及衣物护理机的自清洁控制方法

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US3331943A (en) * 1964-11-09 1967-07-18 Gen Electric Vaporizing apparatus for cleaning domestic oven
DE2842771A1 (de) * 1978-09-30 1980-04-10 Lechmetall Landsberg Gmbh Vorrichtung und verfahren zur waermebehandlung von nahrungsmitteln, insbesondere zur zubereitung von speisen
DE19730610C1 (de) * 1997-07-17 1998-10-22 Wiesheu Gmbh Ofen zur Wärmebehandlung von Lebensmitteln und Verfahren zum Reinigen des Innenraums
DE10207306B4 (de) * 2002-02-21 2005-09-01 Angelo Po Grandi Cucine S.P.A., Carpi Verfahren zur automatischen Garraumreinigung
JP2004069175A (ja) * 2002-08-06 2004-03-04 Matsushita Electric Ind Co Ltd 高周波加熱装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4199792A4 (de) * 2020-08-20 2024-10-23 Arcelik As Steuerungsverfahren für einen ofen

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Publication number Publication date
EP1557612A1 (de) 2005-07-27
DE602004003783D1 (de) 2007-02-01
ES2276174T3 (es) 2007-06-16
DE602004003783T2 (de) 2007-04-26

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