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
  • F24C1/00—Stoves or ranges in which the fuel or energy supply is not restricted to solid fuel or to a type covered by a single one of the following groups F24C3/00 - F24C9/00; Stoves or ranges in which the type of fuel or energy supply is not specified
  • F24C1/02—Stoves or ranges in which the fuel or energy supply is not restricted to solid fuel or to a type covered by a single one of the following groups F24C3/00 - F24C9/00; Stoves or ranges in which the type of fuel or energy supply is not specified adapted for the use of two or more kinds of fuel or energy supply
  • F24C1/04—Stoves or ranges in which the fuel or energy supply is not restricted to solid fuel or to a type covered by a single one of the following groups F24C3/00 - F24C9/00; Stoves or ranges in which the type of fuel or energy supply is not specified adapted for the use of two or more kinds of fuel or energy supply simultaneously
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
  • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type
  • F24C14/025—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type for gaseous fuels

Definitions

• the present invention relates to a gas oven, and preferably a domestic gas oven.
• a gas oven comprises a cooking chamber, one or more gas burners being adapted to heat the cooking chamber.
• These burners are generally disposed at the floor and / or the vault of the cooking chamber.
• a gas supply line of the burner is provided and connected to a gas source, outside the oven.
• the temperature adjustment in the cooking chamber is then achieved by means of a thermostat, type bulb thermostat, controlling a gas flow control valve supplying the burner, thereby reducing or increasing the burner power , it remains permanently on.
• the range of temperature control in the center of a cooking chamber of a gas oven generally ranges between 150 0 C and 285 0 C.
• the present invention aims to provide a gas oven with a wide range of temperature control.
• the present invention provides a gas oven comprising a cooking chamber, at least one gas burner adapted to heat the cooking chamber and a gas supply line of said at least one burner.
• this gas oven comprises an ignition means adapted to ignite said at least one burner, at least one solenoid valve mounted upstream of said at least one burner on the gas supply line and control means of this solenoid valve adapted to open and close said solenoid valve so as to supply all or nothing said at least one burner.
• the heating of the cooking chamber is no longer regulated by varying the flow rate of the gas supplying the burner, but by extinguishing or igniting the burner, which can be ignited automatically by means of ignition disposed near the burner .
• the rise in temperature in the cooking chamber is no longer limited. It can indeed easily vary over a wide range of temperatures simply by changing the firing times of said burner.
• the gas oven further comprises a temperature sensor disposed in the cooking chamber, the control means being adapted to regulate the temperature of the cooking chamber as a function of a temperature. setpoint by alternately opening and closing said solenoid valve.
• the operating time of the gas burner is managed so as to regulate the temperature inside the cooking chamber to the nearest of a set temperature.
• This control system is very interesting because it allows both to obtain low temperatures, namely for example 35 0 C, in cooking mode and sufficiently high temperatures, ie for example 500 0 C, to achieve the mode cleaning by pyrolysis.
• this set temperature can be between 35 ° C and 300 ° C in the cooking mode of the gas oven.
• this setpoint temperature can be between 450 and 50 ° C., thus making it possible to implement, in a particularly simple manner, a cleaning function by pyrolysis of the oven.
• the gas oven further comprises a grill element, of the electric grill type, allowing in association with the gas burner to obtain temperatures of the order of 500 0 C for the implementation, particularly simple way, a pyrolysis cleaning of the cooking chamber.
• the ignition means is an ignition burner mounted on the gas supply line. It is further associated with a thermocouple controlling a safety member of a valve mounted on said gas supply pipe so as to close said valve in case of extinction of the flame.
• thermocouple makes it possible to authorize or not the gas supply of the burner via the solenoid valve as a function of the state of the ignition burner.
• the ignition means is an ignition electrode associated with ignition control means.
• an ionization electrode is adapted to detect the presence of flame in the burner, the ionization electrode being connected to means for managing the ionization signal.
• the ignition electrode is itself an ionization electrode.
• FIG. 1 is a schematic diagram of a gas furnace according to a first embodiment of the present invention
• Fig. 2 is a block diagram of a second embodiment gas furnace of the present invention.
• FIG. 3 is a schematic diagram illustrating an alternative of the gas oven of FIG. 2.
• FIG. 1 diagrammatically illustrates a gas oven according to one embodiment of the invention in an exploded view making it possible to visualize all the means necessary for the implementation of the invention.
• the cooking oven is for example intended to be integrated in a domestic gas stove.
• This oven comprises a cooking chamber 10 for receiving the food to be cooked.
• a gas burner 11 is here illustrated at the bottom, in the lower part of the cooking chamber 10.
• the cooking chamber could also include several burners at the hearth, or burners distributed between the hearth and the vault of the cooking chamber 10.
• This burner 11 is associated with an ignition means.
• the ignition means is an ignition burner 12 disposed near the burner 11.
• This ignition burner 12 is adapted to ignite the gas burner when the gas burner is supplied with gas.
• this ignition burner 12 is associated with a spark plug 12a which generates a spark beam for igniting the ignition burner 12.
• the cooking chamber 10 also comprises in this embodiment in the upper part of the enclosure an electric grill element 13, this grill element 13 thus allowing to assign a grill function to the gas oven. Finally, the cooking chamber 10 comprises a temperature probe
• This temperature sensor 14 adapted to continuously measure the average temperature in the cooking chamber 10.
• This temperature sensor 14 is connected to an electronic control card 15 which, as will be explained later, allows among other things to regulate the temperature in the enclosure cooking according to the actual temperature measured at the temperature probe 14 and a predetermined set temperature.
• this electronic control board can present all the conventional control functions of a traditional electric oven, such as management of cooking time, delayed start, scheduled shutdown and failures.
• a gas furnace is offered the same operating management possibilities as in the case of an electric furnace.
• This supply system comprises a supply line 16 which is connected in known manner to a gas source 17 outside the oven. At the inlet of this gas supply pipe 16 is mounted a tap 18.
• This valve 18 firstly makes it possible to open or close the gas supply of the pipe 16 from a control button 19 actuated by the user of the oven.
• this valve 18 has an open position and a closed position, so that in the open position the flow of gas entering the pipe 16 is constant.
• this valve 18 is equipped in known manner with a safety member 20 for automatically cutting off the supply of gas to the pipe 16 by closing off the gas inlet 17.
• this safety member 20 is controlled by a thermocouple 21 disposed near the flame of the ignition burner 12.
• a flame is generated by the ignition burner 12, thanks to an ignition spark generated by the spark plug. ignition 12a.
• the spark plug 12a is controlled in a known manner by the control electronics integrated in the electronic card 15 of the gas oven.
• thermocouple is then heated by the flame of the ignition burner 12 and generates a current sufficient to keep the safety member 20 open, away from the gas supply 17.
• thermocouple 21 cools, so that the generated current decreases.
• the automatic closing of the gas inlet 17 at the tap 18 is then performed by releasing the safety member 20 which closes the gas inlet 17.
• this assembly is carried out by means of a bypass of the supply pipe 16, a first portion 16a of the pipe being intended to supply the ignition burner 12 continuously, and a second portion 16b of the supply pipe being intended to supply the gas burner 11.
• a solenoid valve is mounted on the pipe gas supply
• the solenoid valve 22 is mounted on the second portion 16b of the supply line 16.
• This solenoid valve 22 comprises opening and closing means 22a so as to supply all or nothing the burner 11.
• control means of the solenoid valve are integrated on the electronic control board 15. They are thus adapted to electronically control the opening and closing of the solenoid valve 22.
• regulation of the temperature at the level of the electronic card, of the Proportional-Integral or Proportional-Integral-Derivative type can be implemented from the temperature measured by the temperature probe 14 and a temperature of predetermined setpoint.
• This setpoint temperature can be set for example by the user, by means of a control 25 accessible on a control panel of the oven, and be included in the cooking mode between 35 0 C and 300 0 C, and preferably between 35 0 C and 27O 0 C.
• the set temperature can be predetermined at the control electronic board, and between 450 and 50 ° C., and preferably equal to 500 ° C. vs. Maintaining the required setpoint temperature in the cooking chamber is then implemented by alternating opening and closing of the solenoid valve 22, thus allowing the burner 11 to be supplied with all or nothing.
• the presence of the flame of the ignition burner 12 automatically enables the ignition of the burner 11 at full power.
• the temperature inside the cooking chamber can be maintained around the set temperature.
• the solenoid valve 22 is closed.
• the solenoid valve is opened again to allow the temperature rise of the cooking chamber.
• the electric grill 13 is also operated, so as to allow the temperature rise close to 500 ° in the cooking chamber.
• This grill by extinction and alternative ignition, is also managed by the electronic control board, from a regulation of the temperature measured in the cooking chamber relative to the predetermined set temperature.
• FIG. 2 schematically illustrates the various means necessary for the implementation of the invention.
• the ignition means of the burner 11 is an ignition electrode 24 associated with ignition control means 15.
• This ignition electrode 24 is adapted to generate a spark beam near the burner 11.
• the ignition control means 15 are adapted to control the ignition electrode 24 in operation simultaneously with the opening control of the solenoid valve 22 for supplying gas to the burner 11 so as to enable the ignition of this gas burner 11.
• the solenoid valve 22 is mounted on a gas supply line 16 directly connected to a supply of gas outside the oven.
• an ionization electrode 24 is adapted to detect the presence of flame at the burner 11, this ionization electrode being connected to means ionization signal management system also integrated in the electronic control board 15.
• the ignition electrode 24 is also an ionization electrode 24 sensitive to the presence of a flame at the gas burner 11.
• the ionization signal management means are adapted to control the presence of an ionization current at the ionization electrode 24, the absence of current being interpreted by the ionization signal management means as in this case, the control means 15 are adapted to control the closing of the solenoid valve 22. As previously, the control means 15 are adapted to electronically control the opening and closing of the solenoid valve 22, as well as the switching on and off of the electrical resistance 13.
• the ignition control means of the electronic card 15 control, at each opening command of the solenoid valve 22, the generation of spark at the ignition electrode 24 to enable ignition of the burner 11.
• the user has no direct action on the flow of gas by means such as the tap 18 of FIG. 1, that is to say with the aid of a control button 19 in addition to the command 25.
• the user only acts on the control 25 accessible on the control panel of the oven, just as it would do on an electric oven, without worrying ignition of the gas.
• This control 25 thus makes it possible both to control the ignition of the burner 11 by means of the control means 15 and to determine a set temperature taken into account by the control means 15 for regulation.
• control means of the solenoid valve 22, the ignition control means of the ignition electrode 24 and the ionization signal management means of the ionization electrode 24 are integrated on the same power electronic card 15.
• this electronic card can have all the conventional control functions of a traditional electric oven, such as management of cooking time, delayed start, scheduled shutdown and failures.
• two identical solenoid valves 22 can be placed in series on the gas supply line 16 as illustrated in Figure 3 which illustrates an alternative of the second embodiment of Figure 2. These solenoid valves 22 are controlled simultaneously and identically by the control means 15 described above so as to control the opening or closing simultaneously of these solenoid valves 22.
• the gas oven as described previously in the different embodiments thus allows regulation of the temperature of the cooking chamber in a wide temperature range, allowing in particular the implementation of a cleaning by pyrolysis of the enclosure Cooking.
• the electronic control board 15 is adapted to manage the locking of the door of the cooking chamber 10, in one or other of the embodiments.
• the gas oven according to the invention thus has an operation very close to that of a conventional electric oven, and allows to achieve the same dishes, while avoiding the drying of food thanks to moisture generated in the enclosure cooking by the combustion of gas.
• the gas oven according to the invention allows combined cooking modes, in which the burner 11 and the grill 13 operate simultaneously and are regulated according to a set temperature.
• FIGS. 1 to 3 show a gas oven equipped with a safety valve 18 or with an ionization electrode 24.
• the opening and closing control means of the solenoid valve could implement a different regulation, and for example by means of a clock for managing a succession of periods of ignition and extinction of the burner , of predetermined times and calibrated in advance in the oven for a predefined type of cooking.
• This type of regulation is described in particular in document EP 1 199 621.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Baking, Grill, Roasting (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=35447713

Family Applications (1)

Country Status (4)

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Family Cites Families (4)

• 2005
  • 2005-05-04 FR FR0504598A patent/FR2885405B1/fr active Active
• 2006
  • 2006-05-04 EP EP06743763A patent/EP1888969A1/de not_active Withdrawn
  • 2006-05-04 WO PCT/FR2006/001006 patent/WO2006117484A1/fr not_active Application Discontinuation
  • 2006-05-04 ZA ZA200709958A patent/ZA200709958B/xx unknown

Non-Patent Citations (1)

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