FR2899957A1 - Domestic baking oven for e.g. cooker, has power control device controlling electric heating element, gas supply management control device, and gas burner by switching unit, and control assembly controlling electric or gas baking oven - Google Patents

Abstract

The oven has a cooking chamber (2), and an electric control assembly (16) constituting a control interface (17) and an electronic power control device (18). The control interface has an electronic and/or electromechanic control unit (19). The device (18) controls an electric heating element (10), a gas supply management control device (21), and a gas burner (9) by a switching unit (20), where the gas burner is adapted to heat the cooking chamber. The assembly (16) controls an electric baking oven or a gas baking oven.

Description

The present invention relates to a cooking oven, and preferably a

  domestic cooking oven. In general, the present invention relates to the operation of a domestic cooking oven during a cooking sequence and also during a pyrolysis cleaning mode. Traditionally, a known domestic cooking oven can be supplied with electrical energy. This electric domestic cooking oven comprises a muffle, one or more electric heating elements being adapted to heat the air contained in the muffle. An electric household cooking oven may also include an electronic power board for managing the power supply of the electric heating elements. The electronic power card is controlled by control devices arranged on a control panel. These control elements may be, for example, electromechanical switches and / or electronic switches. In addition, a domestic gas cooking oven comprises a muffle, one or more gas burners being adapted to heat the air contained in the muffle. These burners are generally arranged under the bottom wall or the top wall of the muffle. The temperature of the air in the muffle is generally regulated by a thermostat controlling a gas flow control valve supplying the gas burner. This valve makes it possible to increase or decrease the gas flow supplying the gas burner by constantly being lit. These domestic gas cooking ovens make it possible to regulate the temperature of the air contained in the oven at a set temperature of between 150 and 285 C. However, the known domestic cooking ovens do not make it possible to control at least one burner gas and at least one electric heating element from common control means. The present invention aims to provide a domestic cooking oven 30 for controlling at least one gas burner and at least one electric heating element from common electrical control means. Thus, some of the control means are identical for an electric domestic cooking oven and a domestic gas cooking oven. The control panels of domestic electric and gas cooking ovens are structurally identical. The electromechanical and / or electronic control means may be used on domestic gas and electric cooking ovens. While the control means known to those skilled in the art designing domestic gas ovens do not allow to transpose a domestic gas cooking oven to an electric household cooking oven. Traditional control means used in domestic gas cooking ovens are specifically designed to supply gas heating means.

  For this purpose, the present invention is directed to a domestic cooking oven comprising a cooking chamber, an electric control assembly consisting of a control interface and an electronic power control device, said control interface comprising means for electromechanical and / or electronic control.

  According to the invention, the electronic power control device controls, by switching means, at least one electric heating element and an electronic control device for managing the supply of gas to at least one gas burner adapted to heat the gas. cooking chamber. Thus, the electric control assembly is common to electric household cooking ovens and domestic gas cooking ovens. The components required for this electrical control assembly are standardized and purchased by the manufacturer on a larger scale to reduce the cost of obtaining an oven according to the invention. In this way, the manufacturer of domestic cooking oven has the ability to easily design cooking ovens with or without a gas supply module consisting of members for supplying gas to at least one gas burner. The gas supply module can easily be replaced by at least one electric heating element when designing a domestic cooking oven without having to modify the structure of said oven. Said at least one heating element connects to the electronic power control device in place of the electronic control device for managing the gas supply. The gas supply module is replaceable by at least one electric heating element since the temperature regulation of the cooking chamber is identical for a domestic cooking oven comprising at least one gas burner or electric heating elements. The electric control assembly can be used to control either an electric cooking oven or a gas cooking oven. In a particularly advantageous embodiment of the invention, the electronic power control device is implanted on a first electronic card and the electronic control device for managing the gas supply is implanted on a second electronic card. In this way, the first electronic board of the electronic power control device is identical for domestic electric cooking ovens and domestic gas cooking ovens. Said two electronic cards may form a single entity according to another embodiment of the invention. In practice, the switching means of the electronic power control device are electrical relays. These electrical relays are located on an electronic power board. The control means of the control interface are connected only to the electronic power control device. The electronic control device for managing the gas supply is connected only to the electronic power control device. No control means of the electrical control assembly controls a member of the gas supply module. The gas supply module is fully controlled by the electronic control device for gas supply management.

  The electronic control device for managing the gas supply controls at least two gas supply solenoid valves of the at least one gas burner, said at least two solenoid valves being connected in series and upstream of said at least one gas burner. on a gas supply line. A first solenoid valve is a safety means for supplying gas to the at least one gas burner. Said first solenoid valve is constantly open during an operating cycle and is closed upon detection of a malfunction of the domestic cooking oven. A second solenoid valve is a means for regulating the temperature of the oven cooking chamber.

  In a practical embodiment of the invention, the electronic control device for managing the gas supply controls at least one incandescent ignition means of the at least one gas burner. The at least one gas burner may be automatically ignited by the incandescent ignition means disposed proximate to the at least one burner.

  Said incandescent element allows ignition of the gas by a rise in temperature in a range between 1300 C and 1500 C. In addition, an ionization electrode is adapted to detect the presence of flames in said at least one burner. The ionization electrode is directly connected to the electronic control device for managing the gas supply.

  The electronic control device for managing the gas supply is adapted to open and close at least one solenoid valve so as to supply all or nothing said at least one gas burner. Thus, the heating of the air contained in the muffle is regulated by the start-up and shutdown of at least one gas burner and not by a change in the flow rate of the gas supplying the at least one burner gas. The rise in temperature in the cooking chamber is no longer prohibited in the range between 35 C and 150 C. It can indeed easily vary in this temperature range by simply changing the ignition times of the at least one burner gas. The temperature regulation of the cooking chamber is between 35 C and 300 C in the cooking mode of said oven.

  The temperature regulation of the cooking chamber is between 450 C and 510 C in the pyrolytic cleaning mode of said oven. A temperature sensor is connected directly to the electronic power control device to implement the temperature control of the at least one electric heating element and the at least one gas burner.

  This temperature probe is disposed in the cooking chamber. The electronic power control device is adapted to regulate the temperature of the cooking chamber according to a set temperature by an on / off mode of operation. This operating mode allows the opening and closing of the relays of the electronic power control device to regulate the temperature of the cooking chamber according to the set temperature. The electronic control device for managing the gas supply is a slave of the electronic power control device. In addition, the control means of a domestic gas cooking oven are identical to those mounted in domestic electric cooking ovens and in this way to achieve economies of scale for the appliance manufacturer. In addition, the control strips can be almost similar in order to use common part numbers for domestic gas cooking ovens and electric household cooking ovens.

  Preferably, said at least one electric heating element of the domestic cooking oven is a grill element mounted in the cooking chamber. The grill element is an electric grill, the electronic power control device being adapted to turn on or off the grill element so as to regulate the temperature of the cooking chamber according to a set temperature, and said at least one gas burner and the grill element being controlled simultaneously by said electronic power control device and the electronic control device for managing the gas supply. In one embodiment of the invention, the electronic power control device controls at least one switching means to turn on and off said at least one electric heating element. In another embodiment of the invention, the electronic power control device controls at least one switching means of the electrical power supply of said at least one electric heating element. Said switching means of the electronic power control device is in series with at least one switching means of the electronic control device for managing the supply of gas for supplying and extinguishing said at least one electric heating element. Said at least one switching means of the electronic power control device is upstream of said at least one switching means of the electronic control device for managing the gas supply. Other features and advantages of the invention will become apparent in the description below.

  In the only accompanying drawing, given by way of nonlimiting example: - Figure 1 is a sectional view in elevation of a domestic cooking appliance according to the invention. We will first describe, with reference to Figure 1, a domestic cooking appliance 1 according to the invention. This domestic cooking appliance 1 is such that a range comprising a domestic cooking oven. The domestic cooking oven 1 may also be intended to be integrated into a built-in cabinet. This oven 1 comprises a muffle 2 for receiving the food to be cooked. The front face 3 of the muffle 2 is closed by a door 4, and comprises an upper wall 5, side walls 6, a bottom wall 7 and a bottom wall 8. Said oven 1 also comprises at least one heating means 9 arranged under the lower wall 8 of said muffle 2. The heating means 9 disposed under the bottom wall 8 of the muffle 2, as shown in Figure 1, is an on-off gas burner.

  In this embodiment, a single gas burner 9 has been illustrated. Of course, the muffle 2 could also include several burners 9 below the bottom wall 8 of the muffle 2. The muffle 2 also comprises in this embodiment an electric heating element 10 supplied in all or nothing arranged under the upper wall 5 of the muffle 2. This heating element 10 makes it possible to raise the temperature of muffle 2 more quickly in cooking mode. This electric heating element 10 makes it possible to assign a grill function to this cooking oven 1. Of course, the assembly is described in an appliance casing which does not need to be described here. In addition, all the other components necessary for the operation of a gas-fired domestic cooking appliance, such as, for example, the ventilation and insulation means, are not shown or described since they can be identical to those well known to those skilled in this field. The domestic cooking oven 1 comprises control means 15 adapted to turn on and off the gas burner 9 and the electric heating element 10 so as to regulate the temperature of the air contained in the muffle 2 as a function of a temperature. deposit. The domestic cooking oven 1 comprises a cooking chamber 2, an electrical control assembly 16 consisting of a control interface 17 and an electronic power control device 18. The electrical control unit 16 is connected in a manner known to an electricity source 11 outside the domestic cooking oven 1. Said control interface 17 comprises electromechanical control means and / or electronic 19. The electronic control device 18 controlled by switching means 20 at least an electric heating element 10 and an electronic control device for managing the gas supply 21 of at least one gas burner 9 adapted to heat the cooking chamber 2. The electrical control unit 17 makes it possible to control either an electric cooking oven or a gas cooking oven. The electronic control device for managing the gas supply 21 is a slave of the electronic power control device 18. The switching means 20 of the electronic power control device 18 are electrical relays. The control means 19 of the control interface 17 are connected only to the electronic power control device 18.

  The control means 19 of the control interface 17 electrically control the electronic power control device 18. The control means 19 of the control interface 17 can not directly control at least one component of the power supply module. 22. The electrical control assembly 16 does not include any component for supplying gas to the at least one gas burner 9. The control means 19 of the control interface 17 do not include, for example, a tap. The electronic control device for managing the gas supply 21 is only connected to the electronic power control device 18. The control of the members comprised in the gas supply module 22 are controlled solely by the connecting link the electronic control device for managing the gas supply 21 with the electronic power control device 18. The electronic control device for managing the gas supply 21 controls at least two solenoid valves 23 for supplying gas to the at least one gas burner 9, said at least two solenoid valves 23 being connected in series and upstream of said at least one gas burner 9 on a gas supply pipe 24.

  The electronic control device for managing the gas supply 21 is adapted to open and close at least one solenoid valve 23 so as to supply all or nothing said at least one gas burner 9. A first solenoid valve 23 is a means of security for the supply of gas to the at least one gas burner 9. Said first solenoid valve 23 is constantly open during an operating cycle and is closed as soon as a malfunction of the domestic cooking oven is detected 1. A second solenoid valve 23 is means for controlling the temperature of the cooking chamber 2 of the oven 1. The control means of the at least two solenoid valves 23 are integrated in the electronic control device for managing the gas supply 21. This electronic control device for managing the gas supply 21 is an electronic card adapted to electronically control the opening and closing of said at least two elec trovannes 23. The electronic control device for managing the gas supply 21 controls at least one incandescent ignition means 25 of the at least one gas burner 9. Said at least one incandescent ignition means 25 is electric and disposed in proximity to the at least one gas burner 9. This electric ignition means 25 is adapted to ignite said at least one gas burner 9 when the latter is supplied with gas.

  In practice, the ignition of the gas is carried out by the rising incandescent element at a temperature between 1300 C and 1500 C. The said incandescent element is supplied directly by the electronic control device for managing the gas supply 21. Finally, , the cooking chamber 2 comprises a temperature sensor 26 connected directly to the electronic power control device 18 to implement the temperature control of the at least one electric heating element 10 and the at least one gas burner 9. 8- The temperature sensor 26 is adapted to continuously measure the average temperature in the cooking chamber 2. Said temperature sensor 26 allows among other things to regulate the temperature in the cooking chamber 2 according to the actual temperature measured at the temperature probe 26 and a predetermined set temperature. The gas supply module 22 of the domestic cooking oven 1 will now be described. This gas supply module 22 comprises a gas supply pipe 24 which is connected in known manner to an external gas source 12 In the domestic cooking oven 1. At the inlet of this gas supply pipe 24 is mounted at least two solenoid valves 23. Said at least two solenoid valves 23 can open or close the gas supply of the duct 24 supply 24 from electrical information issued by the electronic control device for managing the gas supply 21. Here, said at least two solenoid valves 23 have an open position and a closed position. In the open position, the flow rate of gas entering the gas supply pipe 24 is constant. On the gas supply pipe 24 are mounted said at least two solenoid valves 23 and said at least one gas burner 9. Said at least two solenoid valves 23 are connected in series by said gas supply pipe 24. Said first solenoid valve 23 is mounted upstream of said second solenoid valve 23 on the gas supply pipe 24. The first solenoid valve 23 having a safety function makes it possible to cut off the gas supply the most upstream. Said at least two solenoid valves 23 are mounted upstream of the at least one gas burner 9 on the gas supply pipe 24. Said at least two solenoid valves 23 comprise means for opening and closing so as to supply said at least one a gas burner 9 in all or nothing.

  Here, said at least two solenoid valves 23 are controlled by the electronic control device for managing the gas supply 21. Said electronic control device for managing the gas supply 21 is adapted to electrically control the opening and the closure of said at least two solenoid valves 23. In practice, a traditional regulation of an electric domestic cooking oven temperature can be implemented from the temperature measured by the temperature probe 26 and a predetermined set temperature . The temperature regulation of the cooking chamber 2 is between 35 ° C. and 300 ° C. in the cooking mode of said oven 1. The temperature regulation of the cooking chamber 2 is between 450 ° C. and 510 ° C. in the operating mode. pyrolytic cleaning of said furnace 1. The maintenance of the required setpoint temperature in the cooking chamber 2 is then implemented by the opening and the closing alternative of at least one solenoid valve 23, thus allowing the feeding in all or none of the at least one gas burner 9. Said at least one gas burner 9 may have a power of the order of 2500W. When said at least two solenoid valves 23 are open, said at least one gas burner 9 is at full power. The flow rate of gas introduced into the gas supply pipe 24 is at the maximum. The presence of the ignition of the at least one incandescent ignition means 25 allows the automatic ignition of the at least one gas burner 9 and at full power. By changing the duration of ignition of the at least one gas burner 9, the temperature inside the cooking chamber 2 can be maintained around the set temperature. More specifically, when the temperature in the cooking chamber 2 is greater than the set temperature, said at least one control solenoid valve 23 is closed. When the difference between the temperature in the cooking chamber 2 and the target temperature reaches a predetermined threshold value lower than said set temperature, said at least one control solenoid valve 23 is open to allow the temperature rise of the enclosure 2. In order to ensure the safety of the furnace 1 in the event of extinction of the flame of the at least one gas burner 9, an ionization electrode 27 is adapted to detect the presence of flame at the level of the at least one gas burner 9. Said ionization electrode 27 is connected to ionization signal management means integrated into the electronic control device for managing the gas supply 21. Moreover, to detect the problems of interfering with ignition, that is to say the partial ignition of the burner, said at least one incandescent ignition means 25 is placed at a distance from an ionization electrode 27. The ionization electrode 27 is located at a first end of said at least one gas burner 9 and said at least one incandescent ignition means 25 is located at a second end of the at least one gas burner 9. The first end of said at least one gas burner 9 corresponds to an area near the first flame in the firing order of the at least one gas burner 9 and the second end to a zone near the last flame in the firing order of said at least one gas burner 9. Preferably, said at least one incandescent ignition means is placed in proximity to the first flame path flame (not shown) of the at least one gas burner 9 and an ionization electrode 27 near the last flame of said flame path of said at least one gas burner 9.

  Said at least one gas burner 9 comprises a flame path where openings are provided in an internal gas supply ramp for the passage of the ignited gas. Said openings of the flame path are provided along the at least one gas burner 9 and where the heat must be diffused in the cooking chamber 2.

  The internal gas supply ramp of said at least one gas burner 9 of a domestic cooking oven 1 is generally U-shaped. The first flame of the flame path is disposed at one end of the internal supply ramp U-shaped gas of said at least one gas burner 9 and the last flame of the flame path at another end of the U-shaped gas supply internal ramp of said at least one gas burner 9. Said electrode ionization device 27 and said at least one incandescent ignition means 25 are located opposite to the internal gas supply ramp of the at least one gas burner 9. Said at least one incandescent ignition means 25 is placed at the beginning of the internal gas supply ramp of the at least one gas burner 9 and the ionization electrode 27 at the end of said internal gas supply ramp of said at least one gas burner 9. , the complete ignition of the at least one gas burner 9 is ensured re. If a partial or complete ignition failure occurs on said at least one gas burner 9, the ionization electrode 27 detects the non-presence of flame and the signal of said ionization electrode 27 is transmitted to the electronic control device for controlling the gas supply 21 for shutting off the gas supply to the at least one gas burner 9. When selecting a combined cooking mode, the grill element 10 is also operated. A grill element 10 is mounted in the cooking chamber 2. The grill element 10 is an electric grill, the electronic power control device 18 being adapted to turn on or off the grill element 10 so as to regulate the temperature of the cooking chamber 2 as a function of a set temperature, and said at least one gas burner 9 and the grill element 10 being controlled simultaneously by said electronic control device 18. The operation of the grill element 10 in all or nothing is also managed by the electronic power control device 18 and the control means 19 of the control interface 17 may include a means for selecting the cooking modes and means for selecting a set temperature. The electric grill element 10 may comprise two heating resistors making it possible to obtain powers of the order of 1800W with a single heating resistor and 2600W by simultaneously supplying the two heating resistors. A domestic cooking oven according to the invention makes it possible to standardize the control members of an electric cooking oven and a gas cooking oven. In addition, the structure of the electric cooking oven and the gas cooking oven may be identical. In this way, the domestic cooking oven manufacturer reduces the cost of obtaining a cooking oven according to the invention. The gas supply module is replaceable by an electric heating element to easily convert a gas cooking oven into an electric cooking oven. The heating elements of the gas and electric type are thus considered as interchangeable modules.

  Of course, many modifications can be made to the embodiments described above without departing from the scope of the invention.

Claims (11)

  Domestic cooking oven comprising a cooking chamber (2), an electrical control assembly (16) consisting of a control interface (17) and an electronic power control device (18), said interface control unit (17) comprising electromechanical and / or electronic control means (19), characterized in that the electronic power control device (18) controls by switching means (20) at least one electric heating element (10) and an electronic control device for managing the gas supply (21) of at least one gas burner (9) adapted to heat the cooking chamber (2).   2- Domestic cooking oven according to claim 1, characterized in that the electrical control unit (16) allows to control either an electric cooking oven or a gas cooking oven.   3- domestic cooking oven according to claim 1 or 2, characterized in that the switching means (20) of the electronic power control device (18) are electrical relays.   4- Domestic cooking oven according to any one of claims 1 to 3, characterized in that the control means (19) of the control interface (17) are connected only to the electronic power control device (18) .   Domestic cooking oven according to any one of claims 1 to 4, characterized in that the electronic control device for managing the gas supply (21) is connected only to the electronic power control device (18). .   6- Domestic cooking oven according to any one of claims 1 to 5, characterized in that the electronic control device for managing the gas supply (21) controls at least two solenoid valves (23) for gas supply at least one gas burner (9), said at least two solenoid valves (23) being connected in series and upstream of said at least one gas burner (9) on a gas supply line (24).   7- Domestic cooking oven according to any one of claims 1 to 6, characterized in that the electronic control device for managing the gas supply (21) controls at least one incandescent ignition means (25) of the at least one gas burner (9).   8- Domestic cooking oven according to any one of claims 1 to 7, characterized in that the electronic control device for managing the gas supply (21) is adapted to open and close at least one solenoid valve (23) to supply all or nothing said at least one gas burner (9).   9- Domestic cooking oven according to any one of claims 1 to 8, characterized in that a temperature sensor (26) is connected directly to the electronic control device (18) to implement the temperature control at least one electric heating element (10) and the at least one gas burner (9).   10- Domestic cooking oven according to any one of claims 1 to 9, characterized in that the electronic control device for managing the gas supply (21) is slave of the electronic control device power (18).   11-Domestic cooking oven according to any one of claims 1 to 10, characterized in that said at least one incandescent ignition means (25) is placed near the first flame of the flame path of the at least one burner gas generator (9) and an ionization electrode (27) near the last flame of said flame path of said at least one gas burner (9).