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EP0351683A2 - Oven with air circulation - Google Patents

Oven with air circulation Download PDF

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Publication number
EP0351683A2
EP0351683A2 EP89112567A EP89112567A EP0351683A2 EP 0351683 A2 EP0351683 A2 EP 0351683A2 EP 89112567 A EP89112567 A EP 89112567A EP 89112567 A EP89112567 A EP 89112567A EP 0351683 A2 EP0351683 A2 EP 0351683A2
Authority
EP
European Patent Office
Prior art keywords
switching
temperature controller
operating mode
convection oven
heating element
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Withdrawn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
EP89112567A
Other languages
German (de)
French (fr)
Other versions
EP0351683A3 (en
Inventor
Klaus Dipl.-Ing. Pieper
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.)
Kueppersbusch AG
Kuppersbusch AG
Original Assignee
Kueppersbusch AG
Kuppersbusch AG
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 Kueppersbusch AG, Kuppersbusch AG filed Critical Kueppersbusch AG
Publication of EP0351683A2 publication Critical patent/EP0351683A2/en
Publication of EP0351683A3 publication Critical patent/EP0351683A3/en
Withdrawn legal-status Critical Current

Links

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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
    • 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
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/327—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation with air moisturising

Definitions

  • the invention relates to a convection oven according to the preamble of the first claim.
  • the invention is based on the object of taking measures in a convection oven according to the preamble of the first claim, by means of which simple operations to prevent incorrect operation when selecting the operating mode.
  • a switching device can be used to prevent the recirculation fan from being operated at an increased speed below a predetermined temperature value.
  • the steam generator can only be switched on via the associated switching device when a specific, predetermined temperature value has been set on the temperature controller.
  • the undesirably high amount of air is switched on at a low temperature or the insufficient, low amount of air is switched on at the circulating air fan at a high temperature.
  • the latter can cause the air-cooled muffle heating element to burn through, while in the first case the cooking result can be poor. Inapplicable program variation options are thus excluded and increased ease of use when selecting the operating mode is achieved.
  • the temperature controller or its setting element in particular the axis of rotation of a temperature controller for controlling the heating element, can be assigned at least one operating mode function switch which e.g. can be designed as a limit switch and is actuated or changed its switching position only after a predetermined adjustment path or angle of rotation of the temperature controller. Then, for example, the increased speed of the circulating air blower will be automatically switched on after this predetermined adjustment path.
  • operating mode function switch e.g. can be designed as a limit switch and is actuated or changed its switching position only after a predetermined adjustment path or angle of rotation of the temperature controller. Then, for example, the increased speed of the circulating air blower will be automatically switched on after this predetermined adjustment path.
  • the temperature controller prefferably be assigned an electrical setting resistor as the setpoint generator, the resistance value of which is changed via the adjustment path.
  • This change in resistance or the respectively set resistance value is recorded in a connected electrical evaluation circuit and is preferably converted into a switching signal for the muffle heating element in comparison with a temperature-dependent resistance value.
  • this resistance value is also compared with a fixed operating mode switching value, which e.g. corresponds to the value at which the speed changeover and / or the connection or disconnection of the steam generator is to take place.
  • the switching device controlled in this way thus leads to the automatic switching of the operating mode.
  • a separate, adjustable resistor can be coupled to the temperature controller for the operating mode switching value.
  • a switch circuit board preferably a step switch, can also be coupled to the setting element of the temperature controller, by means of which a change in the operating mode is set depending on the adjustment path.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cookers (AREA)
  • Control Of Temperature (AREA)

Abstract

In an oven with air circulation, a heating element is provided with an associated speed-switchable circulating air blower, the heating element being controlled by a manually adjustable temperature control. Moreover, switching devices are provided for the alternative switching of the type of operation, e.g. by means of speed switching and/or by means of switching on a steam generator. In order, in this connection, to prevent incorrect operations in a simple manner, at least one switching device is controlled independently from the set-point.

Description

Die Erfindung betrifft einen Umluftofen gemäß dem Oberbegriff des ersten Anspruchs.The invention relates to a convection oven according to the preamble of the first claim.

Es ist bei Umluftöfen ganz allgemein bekannt, der das Gargut aufneh­menden Herdmuffel ein drehzahlumschaltbares Umluftgebläse und ein Heizelement zuzuordnen, das abhängig von einem Temperatursollwert gesteuert wird, welcher mittels eines manuell einstellbaren Tempera­turstellers, vorzugsweise eines Temperaturregelschalters, vorgegeben wird. Dabei kann mit Hilfe wenigstens einer Schalteinrichtung die Drehzahl des Umluftgebläses umgeschaltet und ggf. ein Dampferzeuger zu- oder abgeschaltet bzw. allein eingeschaltet werden, der Dampf in die Herdmuffel zum Dampfgaren oder zum kombinierten dampfunter­stützten Garen bei Umluftbetrieb liefert. Bei diesem Aufbau ist neben einzelnen Schaltern oder einem mehrstufigen Dreh- oder Schiebeschal­ter ein eigener Schalter zur Drehzahlumschaltung des Umluftgebläses erforderlich. Hierdurch besteht die Gefahr, daß das Umluftgebläse bei einzelnen Betriebsarten mit unrichtiger Drehzahl betrieben wird.It is generally known in convection ovens to assign a speed-switchable circulating air fan and a heating element to the oven muffle receiving the food to be cooked, which is controlled as a function of a temperature setpoint, which is predetermined by means of a manually adjustable temperature controller, preferably a temperature control switch. With the help of at least one switching device, the speed of the circulating air blower can be switched over and, if necessary, a steam generator can be switched on or off or switched on alone, which delivers steam into the muffle for steam cooking or for combined steam-assisted cooking in circulating air mode. With this construction, in addition to individual switches or a multi-stage rotary or slide switch, a separate switch for changing the speed of the recirculation fan is required. As a result, there is a risk that the circulating air blower is operated at incorrect speed in individual operating modes.

Der Erfindung liegt die Aufgabe zu Grunde, bei einem Umluftofen gemäß dem Oberbegriff des ersten Anspruchs Maßnahmen zu treffen, durch die mit einfachen Mitteln Fehlbedienungen bei der Betriebsar­tenwahl verhindert werden.The invention is based on the object of taking measures in a convection oven according to the preamble of the first claim, by means of which simple operations to prevent incorrect operation when selecting the operating mode.

Die Lösung dieser Aufgabe erfolgt gemäß der Erfindung durch die kennzeichnenden Merkmale des ersten Anspruchs.This object is achieved according to the invention by the characterizing features of the first claim.

Bei einer Ausgestaltung eines Umluftofens gemäß der Erfindung wird eine Verringerung der gesondert manuell auszuwählenden Schalter bzw. Schaltstufen erreicht und verhindert, daß bei bestimmten Betriebsarten nachteilige Betriebsbedingungen eingestellt werden.In a configuration of a convection oven according to the invention, a reduction in the switches or switching stages that are to be selected manually is achieved and it is prevented that disadvantageous operating conditions are set in certain operating modes.

So kann abhängig vom Einstellwert des Temperaturreglers über eine Schalteinrichtung verhindert werden, daß das Umluftgebläse unterhalb eines vorbestimmten Temperaturwertes mit erhöhter Drehzahl betrieben wird. Auch kann der Dampferzeuger erst dann über die zugehörige Schalteinrichtung einschaltbar sein, wenn am Temperatursteller ein bestimmter, vorgegebener Temperaturwert eingestellt ist. Durch die zwangsweise Aktivierung der Schalteinrichtungen für die Drehzahlum­schaltung oder den Dampferzeuger oder dergl. bzw. deren Abschaltung werden Fehlbedienungen sicher unterbunden, weil diese Funktionen mit der Sollwerteinstellung des Temperaturreglers gekoppelt sind. Daher können entsprechende, manuell zu betätigende Zusatzschalter, Pro­grammtasten oder dergl. entfallen, wodurch sich eine bessere Über­sichtlichkeit bei der Bedienung bzw. Betriebsartenwahl ergibt. Bei­spielsweise kann dann automatisch ausgeschlossen werden, daß bei niedrig eingestellter Temperatur die unerwünscht hohe Luftmenge bzw. bei hoch eingestellter Temperatur die unzureichende, niedrige Luftmen­ge am Umluftgebläse eingeschaltet wird. Letzteres kann zum Durch­brennen des umluftgekühlten Muffel-Heizelementes führen, während im ersten Fall das Garergebnis mangelhaft ausfallen kann. Es werden somit unzweckmäßige Programmvariationsmöglichkeiten ausgeschlossen und ein erhöhter Bedienungskomfort bei der Betriebsartenwahl erzielt.Depending on the setting value of the temperature controller, a switching device can be used to prevent the recirculation fan from being operated at an increased speed below a predetermined temperature value. Also, the steam generator can only be switched on via the associated switching device when a specific, predetermined temperature value has been set on the temperature controller. By forcibly activating the switching devices for the speed changeover or the steam generator or the like or switching them off, incorrect operations are reliably prevented because these functions are coupled with the setpoint setting of the temperature controller. Corresponding, manually operated additional switches, program keys or the like can therefore be dispensed with, which results in a better clarity in the operation or mode selection. For example, it can then automatically be ruled out that the undesirably high amount of air is switched on at a low temperature or the insufficient, low amount of air is switched on at the circulating air fan at a high temperature. The latter can cause the air-cooled muffle heating element to burn through, while in the first case the cooking result can be poor. Inapplicable program variation options are thus excluded and increased ease of use when selecting the operating mode is achieved.

Dem Temperatursteller oder seinem Einstellglied, insbesondere der Drehachse eines Temperaturreglers zur Steuerung des Heizelementes kann wenigstens ein Betriebsart-Funktionsschalter zugeordnet werden, der z.B. als Endschalter ausgebildet sein kann und erst nach einem vorbestimmten Verstellweg bzw. Drehwinkel des Temperaturstellers betätigt wird bzw. seine Schaltposition verändert. Dann wird nach diesem vorbestimmten Verstellweg beispielsweise die erhöhte Drehzahl des Umluftgebläses automatisch eingeschaltet werden.The temperature controller or its setting element, in particular the axis of rotation of a temperature controller for controlling the heating element, can be assigned at least one operating mode function switch which e.g. can be designed as a limit switch and is actuated or changed its switching position only after a predetermined adjustment path or angle of rotation of the temperature controller. Then, for example, the increased speed of the circulating air blower will be automatically switched on after this predetermined adjustment path.

Daneben ist es aber auch möglich, daß dem Temperatursteller als Sollwertgeber ein elektrischer Einstellwiderstand zugeordnet wird, dessen Widerstandswert über den Verstellweg verändert wird.In addition, it is also possible for the temperature controller to be assigned an electrical setting resistor as the setpoint generator, the resistance value of which is changed via the adjustment path.

Diese Widerstandsänderung bzw. der jeweils eingestellte Widerstands­wert wird in einer angeschlossenen elektrischen Auswerteschaltung erfaßt und vorzugsweise im Vergleich mit einem temperaturabhängigen Widerstandswert in ein Schaltsignal für das Muffel-Heizelement umge­setzt. Zusätzlich wird dieser Widerstandswert auch mit einem fest vorgeschriebenen Betriebsart-Schaltwert verglichen, der z.B. dem Wert entspricht, bei dem die Drehzahlumschaltung und/oder die Zu- bzw. Abschaltung des Dampferzeugers erfolgen soll. Die hierdurch jeweils gesteuerte Schalteinrichtung führt somit zur automatischen Betriebsart­umschaltung. Dabei kann für den Betriebsart-Schaltwert ein eigener, einstellbarer Widerstand mit dem Temperatursteller gekoppelt sein.This change in resistance or the respectively set resistance value is recorded in a connected electrical evaluation circuit and is preferably converted into a switching signal for the muffle heating element in comparison with a temperature-dependent resistance value. In addition, this resistance value is also compared with a fixed operating mode switching value, which e.g. corresponds to the value at which the speed changeover and / or the connection or disconnection of the steam generator is to take place. The switching device controlled in this way thus leads to the automatic switching of the operating mode. A separate, adjustable resistor can be coupled to the temperature controller for the operating mode switching value.

Ferner kann mit dem Einstellglied des Temperatursteller auch eine Schalterplatine, vorzugsweise ein Stufenschalter, gekoppelt sein, durch den abhängig vom Verstellweg eine Änderung der Betriebsart eingestellt wird.Furthermore, a switch circuit board, preferably a step switch, can also be coupled to the setting element of the temperature controller, by means of which a change in the operating mode is set depending on the adjustment path.

Claims (5)

1. Umluftofen, insbesondere für Großküchen zum Heißluft- und/oder Dampfgaren, mit einem der Ofenmuffel zugeordneten drehzahl­umschaltbaren Umluftgebläse, einem Heizelement und einem manuell einstellbaren Temperatursteller, der den Stromkreis des Heizelementes beherrscht sowie mit Schalteinrichtungen zur Um­schaltung der Betriebsart wie z.B. durch Drehzahlumschaltung des Umluftgebläses und/oder durch Einschalten eines Dampferzeugers, der Dampf in die Muffel liefert, dadurch gekennzeichnet, daß wenigstens eine der Schalteinrichtungen abhängig vom Einstell­wert des Temperaturstellers gesteuert ist.1.Vehicle convection oven, especially for commercial kitchens for hot air and / or steam cooking, with a speed-switchable air recirculation fan assigned to the oven muffle, a heating element and a manually adjustable temperature controller that controls the circuit of the heating element and with switching devices for switching the operating mode, e.g. by changing the speed of the air circulation fan and / or by switching on a steam generator that delivers steam into the muffle, characterized in that at least one of the switching devices is controlled as a function of the setting value of the temperature controller. 2. Umluftofen nach Anspruch 1, dadurch gekennzeichnet, daß dem Temperatursteller ein Betriebsarten-Schalter zugeordnet ist, der abhängig vom Verstellwert des Temperatursteller-Einstellgliedes die Betriebsart schaltet.2. A convection oven according to claim 1, characterized in that an operating mode switch is assigned to the temperature controller, which switches the operating mode depending on the adjustment value of the temperature controller setting element. 3. Umluftofen nach Anspruch 1, dadurch gekennzeichnet, daß der Temperatursteller eine drehbare Einstellwelle aufweist, über die abhängig vom Drehwinkel der Betriebsarten-Schalter betätigt wird.3. A convection oven according to claim 1, characterized in that the temperature controller has a rotatable setting shaft, via which the mode switch is actuated depending on the angle of rotation. 4. Umluftofen nach Anspruch 1, dadurch gekennzeichnet, daß der Temperatursteller als Sollwertgeber einen elektrischen Einstellwi­derstand aufweist, der an eine den eingestellten Widerstandswert erfassende Auswerteschaltung angeschlossen ist, in welcher der eingestellte Widerstandswert in wenigstens einem fest vorgegebe­nen Betriebsart-Schaltwert verglichen und eine zugeordnete Schalteinrichtung zur Umschaltung der Betriebsart gesteuert wird.4. A convection oven according to claim 1, characterized in that the temperature controller has as a setpoint sensor an electrical adjusting resistor which is connected to an evaluation circuit detecting the set resistance value, in which the set resistance value is compared in at least one predetermined operating mode switching value and an associated switching device for Switching the operating mode is controlled. 5. Umluftofen nach Anspruch 4, dadurch gekennzeichnet, daß die Auswerteschaltung zusätzlich abhängig vom eingestellten Wider­standswert des Einstellwiderstandes als Sollwertgeber für die die Muffel-Temperatur gesteuert ist und abhängig vom Widerstands­wert das Heizelement schaltet.5. A convection oven according to claim 4, characterized in that the evaluation circuit additionally depending on the set resistance value of the adjusting resistor as a setpoint generator for which the muffle temperature is controlled and the heating element switches depending on the resistance value.
EP19890112567 1988-07-16 1989-07-10 Oven with air circulation Withdrawn EP0351683A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883824157 DE3824157A1 (en) 1988-07-16 1988-07-16 CONVECTION OVEN
DE3824157 1988-07-16

Publications (2)

Publication Number Publication Date
EP0351683A2 true EP0351683A2 (en) 1990-01-24
EP0351683A3 EP0351683A3 (en) 1992-03-11

Family

ID=6358818

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890112567 Withdrawn EP0351683A3 (en) 1988-07-16 1989-07-10 Oven with air circulation

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EP (1) EP0351683A3 (en)
DE (1) DE3824157A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1036990A3 (en) * 1999-02-19 2000-09-27 BSH Bosch und Siemens Hausgeräte GmbH Steam cooking device, in particular baking oven for steam cooking
US7309846B2 (en) 2003-03-27 2007-12-18 Bsh Bosch Und Siemens Hausgeraete Gmbh Method for operating a baking oven

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011113597A1 (en) 2011-09-16 2013-03-21 Rational Aktiengesellschaft Variable adjustable clock ratio

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2219389A3 (en) * 1973-02-23 1974-09-20 Licentia Gmbh
FR2334916A1 (en) * 1975-12-09 1977-07-08 Scholtes Ets Eugen ELECTRIC COOKING OVEN FOR HOUSEHOLD USE
EP0023827A1 (en) * 1979-08-01 1981-02-11 Matsushita Electric Industrial Co., Ltd. Cooking appliance of hot air circulating type
GB2172990A (en) * 1985-03-23 1986-10-01 Buderus Ag A method of cooking food in a forced circulation oven
DE3536008A1 (en) * 1985-10-09 1987-04-09 Winkler Kg F Baking oven with a hot-gas or hot-air circulation heating system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541374B2 (en) * 1975-09-17 1980-04-17 Klaus Ing.(Grad.) 3569 Bad Endbach Pfeiffer Cooking method and device
DE2621926C2 (en) * 1976-05-17 1981-10-08 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Device for setting different temperatures and several operating modes in an oven
DE3016260A1 (en) * 1980-04-26 1981-10-29 Gaggenau-Werke Haus- Und Lufttechnik Gmbh, 7560 Gaggenau Temp. control system for hot air baking oven - has temp. selector switch for baking or roasting, coupled to switch for blower speed control
DE3438920A1 (en) * 1984-10-24 1986-04-24 Alfons Weiss Kg, Fabrik Feinwerktechn. Erzeugnisse, 7209 Gosheim Temperature controller for an oven
DE3528229A1 (en) * 1985-08-06 1987-02-12 Bosch Siemens Hausgeraete ARRANGEMENT FOR CONTROLLING ELECTRICAL CONSUMERS IN OVENS

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2219389A3 (en) * 1973-02-23 1974-09-20 Licentia Gmbh
FR2334916A1 (en) * 1975-12-09 1977-07-08 Scholtes Ets Eugen ELECTRIC COOKING OVEN FOR HOUSEHOLD USE
EP0023827A1 (en) * 1979-08-01 1981-02-11 Matsushita Electric Industrial Co., Ltd. Cooking appliance of hot air circulating type
GB2172990A (en) * 1985-03-23 1986-10-01 Buderus Ag A method of cooking food in a forced circulation oven
DE3536008A1 (en) * 1985-10-09 1987-04-09 Winkler Kg F Baking oven with a hot-gas or hot-air circulation heating system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1036990A3 (en) * 1999-02-19 2000-09-27 BSH Bosch und Siemens Hausgeräte GmbH Steam cooking device, in particular baking oven for steam cooking
US7309846B2 (en) 2003-03-27 2007-12-18 Bsh Bosch Und Siemens Hausgeraete Gmbh Method for operating a baking oven

Also Published As

Publication number Publication date
EP0351683A3 (en) 1992-03-11
DE3824157A1 (en) 1990-01-18

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