EP2837890A2 - Procédé de fonctionnement d'un four de cuisson à gaz et four de cuisson à gaz - Google Patents

Procédé de fonctionnement d'un four de cuisson à gaz et four de cuisson à gaz Download PDF

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Publication number
EP2837890A2
EP2837890A2 EP14175350.9A EP14175350A EP2837890A2 EP 2837890 A2 EP2837890 A2 EP 2837890A2 EP 14175350 A EP14175350 A EP 14175350A EP 2837890 A2 EP2837890 A2 EP 2837890A2
Authority
EP
European Patent Office
Prior art keywords
gas burner
gas
burner
muffle
oven
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14175350.9A
Other languages
German (de)
English (en)
Other versions
EP2837890A3 (fr
Inventor
Marcus Frank
Rolf Seeburger
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
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 EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Publication of EP2837890A2 publication Critical patent/EP2837890A2/fr
Publication of EP2837890A3 publication Critical patent/EP2837890A3/fr
Withdrawn legal-status Critical Current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
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/122—Arrangement or mounting of control or safety devices on stoves
    • 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
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/008—Ranges
    • 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
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges
    • F24C3/128—Arrangement or mounting of control or safety devices on ranges in baking ovens

Definitions

  • the invention relates to a method for operating a gas oven and a correspondingly designed gas oven.
  • the invention has for its object to provide an aforementioned method and a gas oven suitable for its implementation, with which problems of the prior art can be avoided and it is particularly possible to operate a gas oven in a comfortable and diverse manner with a not too complicated control.
  • the gas oven has a muffle as an interior space, in which an upper gas burner and at the bottom a lower gas burner are arranged at the top. Furthermore, it is advantageous to provide a thermostat which is known per se for controlling the temperature in the muffle.
  • the gas oven has any electronic control, for example with a DSI (Direct Spark Ignition) system, to control the gas burners and their gas valves. Thus, an associated gas valve can be controlled per gas burner.
  • the electronic control can be designed to ignite the gas burners, in particular with a spark plug on the gas burner.
  • the upper gas burner and the lower gas burner in the muffle operated alternately, so advantageous with each heating phases, and particularly advantageous rest periods at each gas burner between the heating phases.
  • the upper gas burner and the lower gas burner are not in operation at the same time, as this could cause problems with the combustion conditions in the muffle or ignition problems or extinction of the flame at the upper gas burner could occur due to lack of fresh air supply and air turbulence on the upper gas burner by the combustion gases of the lower gas burner.
  • this combination operation with alternating operation of the upper and lower gas burner has the great advantage that a food can be supplied from above and from below heat.
  • an upper heating device is operated in the manner of a grill or with the effect of a grill, since food to be cooked is usually not covered on its upper side. Due to the changing operation, a desired temperature for the food to be cooked in the muffle can be kept in all cases without any problems, which can be set and monitored by a thermostat or temperature controller. So it is thus ensured that a desired temperature in the muffle prevails for the cooking process. Furthermore, it is also possible, phase-wise and over a significant period of time or up to half of the duration of the entire cooking process to supply the food from above heat in the manner of an aforementioned grill.
  • Such controls for gas ovens are well known under the keyword Direct Spark Ignition.
  • single or double solenoid valves can be controlled, wherein advantageously the gas valves are not proportional valves, but are designed only for opening and closing.
  • the gas valves are not proportional valves, but are designed only for opening and closing.
  • the DSI can open and close the solenoid valves to supply the gas burner with gas.
  • the DSI advantageously generates a spark on the gas burner via an ignition plug to ignite the gas.
  • Even a flame monitoring can be taken over by the controller or the DSI, and this can be done advantageously via a Ionisationsstromunk.
  • An advantageous electromechanical regulator may be a thermostat. It can be set mechanically to a specific preset temperature and then switches on when it is exceeded Fall below this preset temperature with a certain hysteresis. In any case, it does not provide any permanent signals that correspond to the measured temperature, but switches at a predetermined temperature or signal their exceeding or falling below.
  • a so-called DSI the use of such a thermostat is advantageous because it only switches the mains voltage to the corresponding input of the DSI.
  • the temperature in the muffle is measured by a thermistor, and the control derives the heating demand from the comparison of desired and actual temperature.
  • the operation of the invention is conceivable in both versions.
  • the upper gas burner and the lower gas burner are always operated alternately or always successively. This means that after a certain period of operation of the upper gas burner the lower gas burner is operated and no other, and then again the upper gas burner. On the one hand, this can always take place in succession in the manner of a replacement continuous power generation.
  • a resting phase without operation of the gas burner is inserted between each heating phase of the gas burner. This can be used especially when using an aforementioned thermostat or an electromechanical thermostat, for example, that the heating of the muffle is slow or again with short periods of rest between the heating phases to allow a more accurate temperature measurement through the thermostat.
  • the conditions in the muffle can normalize and also create disturbing turbulences until the other gas burner is then ignited.
  • a heating phase after a certain time of a gas burner to the other gas burner.
  • This can still be provided when heating the gas oven or the muffle. Although it can be provided a short break without heating between two so-called partial heating phases of the gas burner, but this need not be. Due to the alternating operation of the two gas burners even during the heating of the muffle a uniformly distributed heating is ensured.
  • a thermostat for the temperature control have a cycle time.
  • a heating phase of the gas burner especially when heating the muffle, is shorter than the cycle time of the thermostat, even after a heating phase for heating in continuous operation of the gas burner, a change of the gas burner during a thermostatic cycle done.
  • the special circumstances here can be taken into account.
  • a currently operated gas burner can still be operated until the end of a cycle or the thermostatic cycle before, if necessary, after a short rest period, is changed to the other gas burner.
  • the operation of the gas burner or a heating or an increase in the temperature in the muffle is interrupted as little as possible.
  • the variation of the cycle time is only advantageous up to a certain point. If a cycle time becomes too long, it can happen that a food is only heated from one side for a very long or even too long and thus unevenly. This in turn may be undesirable. Especially during a heating process, this can happen.
  • a baking oven 11 is shown with a muffle 12, in which an upper gas burner 14 and a lower gas burner 16 are arranged.
  • the gas burners 14 and 16 are formed as generally known in the art.
  • the upper gas burner 14 is supplied via a gas valve 18 and the lower gas burner 16 via a gas valve 20, wherein the two gas valves can be physically or constructively integrated in a structural unit.
  • two gas valves can be connected in series in a burner string in order to meet the operational safety requirements in the event of malfunction of a gas valve.
  • the gas valves 18 and 20 are connected to a controller 22 of the gas oven 11, which can operate electromechanically or electronically and is designed accordingly or consists of one or more components.
  • a temperature sensor is still provided in the muffle 12, which is advantageous as an electromechanical thermostat 24 or thermistor is trained. It is connected to the controller 22 and provides this in a known manner a signal.
  • a circuit diagram for a gas oven 11 with DSI system is shown as a control.
  • spark plugs 26 and 28 are shown for ignition.
  • the spark plugs 26 and 28 are connected to a DSI 34.
  • Thermocouples are not provided here because the flame is monitored by known ionization current measurement.
  • the gas oven 11 and its controller 22 still a switch for selecting the baking mode, a thermostat 24 for temperature control via the temperature sensor, a timer 36, a door switch 38, a furnace lamp 40 and a power indicator 42.
  • the output of the thermostat 24 is switched through the corresponding switching path of the selector switch on a so-called heat request channel of the DSI 34, which is associated with the lower gas burner 16. If mains voltage is present at the heat request channel, the gas valve of the corresponding burner is opened and the ignition is initiated.
  • the output of the thermostat is switched to the heat request channel of the DSI 34, which is assigned to the upper gas burner 14.
  • the output of the thermostat 24 is switched to both heat request channels of the DSI 34. Then an alternating operation between the gas burners 14 and 16 is carried out, that is, when both heat request channels are simultaneously energized or switched delayed by fractions of a second. In this case, according to the invention, only one of the two gas burners ignited, since never both should be operated together.
  • the selection of the gas burner can be arbitrary or according to predetermined programming. This can be, for example, based on the Fig. 3 seen.
  • the temperature in the muffle 12 is plotted on the vertical axis, namely at a center of gravity.
  • the line "Active burner” shows which of the two gas burners 14 or 16 is operated or is active.
  • the middle row stands for Heat Request top heat and the bottom row stands for Heat Request bottom heat. Both signal the input to the respective gas burner 14 or 16 at the DSI 34.
  • the upper gas burner 14 is operated for a top heat OH. For this purpose, it is ignited by the spark plug 26 and supplied by the gas valve 18 with gas. Because the Gas valves 18 and 20 are advantageous generally not proportional valves, but only fully open or close completely, the gas burners can only work with a fixed predetermined instantaneous power, namely their full power or rated power.
  • Fig. 4 It can be seen how to start with the lower gas burner 16 is started as a bottom heat UH, which is ignited by the spark plug 28 and supplied by the gas valve 20 with gas. Which of the two gas burners 14 or 16 is used first can be stored either deliberately in a software in the controller 22. Alternatively, it can be selected at random.
  • a cycle time or cycle time t T, T or T from the thermostat of its hysteresis, a position of the thermostat sensor in the muffle 12, the thermal insulation of the furnace 11 and the muffle 12, the heating power and the given temperature depends.
  • a cycle time of the thermostat can vary, as from the Fig. 5 can be seen with a relatively long cycle time. In comparison, lie in the 3 and 4 short cycle times and thus also a smaller fluctuation of the temperature.
  • long cycle times there is the danger that a food to be cooked will only heat from one side and thus unevenly for a relatively long time. This should be avoided. This is not only the case with relatively long cycle times according to the Fig. 5 the case, but of course also when heating, especially if according to the Fig. 3 and 5 the heating is started with the upper gas burner 14 or upper heat, since the risk of burns is particularly great here.
  • the gas burner after a set or predetermined time to be changed.
  • This is in the Fig. 6 shown for a thermostat with a relatively long cycle time.
  • the gas burner 14 or 16 is either controlled or arbitrarily started with one of the gas burner 14 or 16, in the Fig. 6 just with the lower gas burner 16 as bottom heat UH.
  • This is operated for a stored in the program flow of the controller 22 time t UH, a .
  • This can be, for example, 30 seconds to 120 seconds.
  • the lower gas burner 16 is cleared and followed by a short waiting time t UH, as a resting phase.
  • the atmosphere normalizes in the muffle 12, so that the upper gas burner 14 can easily ignite and operate, for a time t OH, a .
  • This is in turn followed by a rest period as a waiting time t OH, off .
  • These four times are selected according to the conditions in the gas oven 11 and the muffle 12 and a desired ratio between top heat OH and bottom heat UH.
  • the time t UH one shorter than the cycle time t T, one of the thermostat, as in the Fig. 6 is shown, takes place not only during heating, but also in the steady state, a change of the gas burner. This is just in the Fig.
  • Fig. 8 is shown how a change of the operating mode of the gas oven 11 takes place. At the beginning, there is a bottom heat operation only with the lower gas burner 16. If, during a cycle time t T, a transition from the operating mode of lower heat to a combined operation to a dashed vertical drawn time, so in a first alternative, the currently operated burner can continue to operate until the end of the clock. In the Fig. 8 namely, it can be seen that during the second switching on of the lower gas burner 16 there is already a heat request for top heat OH. Alternatively, it is also possible that the previously operated gas burner, here the lower gas burner 16, is switched off immediately. Then the other gas burner, here the upper gas burner 14, after a waiting or rest phase be ignited to calm the conditions in the muffle 12. This is in the Fig. 9 to see.
  • an electronic control is used, that is to say without DSI, with a temperature-dependent resistance as the temperature sensor, it is possible to continuously access measured values of the temperature sensor. It is not dependent on the signals "on” or “off” as supplied by a thermostatic thermostat.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP14175350.9A 2013-07-22 2014-07-02 Procédé de fonctionnement d'un four de cuisson à gaz et four de cuisson à gaz Withdrawn EP2837890A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013214319.2A DE102013214319A1 (de) 2013-07-22 2013-07-22 Verfahren zum Betrieb eines Gasbackofens und Gasbackofen

Publications (2)

Publication Number Publication Date
EP2837890A2 true EP2837890A2 (fr) 2015-02-18
EP2837890A3 EP2837890A3 (fr) 2015-03-25

Family

ID=51211004

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EP14175350.9A Withdrawn EP2837890A3 (fr) 2013-07-22 2014-07-02 Procédé de fonctionnement d'un four de cuisson à gaz et four de cuisson à gaz

Country Status (3)

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US (1) US20150020692A1 (fr)
EP (1) EP2837890A3 (fr)
DE (1) DE102013214319A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101920769B1 (ko) * 2016-10-31 2018-11-22 엘지디스플레이 주식회사 유기 발광 표시 장치 및 그 제조 방법
JP7316147B2 (ja) * 2019-08-19 2023-07-27 株式会社ハーマン 解凍調理装置
US11754291B2 (en) * 2020-09-28 2023-09-12 Midea Group Co., Ltd. Modulating oven burner control for gas cooking appliance
DE102022115343B3 (de) 2022-06-21 2023-10-05 Miele & Cie. Kg Gargerätemuffel für ein Gargerät, Gargerät und Verfahren zum Betrieb eines Gargeräts

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5913654B2 (ja) * 1978-11-06 1984-03-31 松下電器産業株式会社 加熱調理器
US6222163B1 (en) * 1999-10-13 2001-04-24 Maytag Corporation Gas oven incorporating auxiliary electric heating element
US7759617B2 (en) * 2004-11-03 2010-07-20 General Electric Company Gas range and method for using the same
US8049142B2 (en) * 2007-03-27 2011-11-01 Electrolux Home Products, Inc. Convection preheat system and method for radiant baking
US8776776B2 (en) * 2009-10-21 2014-07-15 General Electric Company Baking system for a gas cooking appliance

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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Also Published As

Publication number Publication date
EP2837890A3 (fr) 2015-03-25
DE102013214319A1 (de) 2015-01-22
US20150020692A1 (en) 2015-01-22

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