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WO2024170499A1 - Agencement de commande doté d'un microrupteur - Google Patents

Agencement de commande doté d'un microrupteur Download PDF

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Publication number
WO2024170499A1
WO2024170499A1 PCT/EP2024/053489 EP2024053489W WO2024170499A1 WO 2024170499 A1 WO2024170499 A1 WO 2024170499A1 EP 2024053489 W EP2024053489 W EP 2024053489W WO 2024170499 A1 WO2024170499 A1 WO 2024170499A1
Authority
WO
WIPO (PCT)
Prior art keywords
microswitch
flame failure
thermocouple
gas
lid
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.)
Ceased
Application number
PCT/EP2024/053489
Other languages
English (en)
Inventor
Emilio Placer Maruri
Roberto Saiz Gonzalez
Mario VELO BEZANILLA
Javier BUENO CEÑA
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete 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 BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of WO2024170499A1 publication Critical patent/WO2024170499A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/105—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electrical or electromechanical means
    • 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
    • F24C15/12—Side rests; Side plates; Cover lids; Splash guards; Racks outside ovens, e.g. for drying plates

Definitions

  • Control arrangement having a microswitch
  • the present disclosure relates to a control arrangement for a gas cooktop, having a flame failure device configured such that a gas passage is held open, while an electricity is supplied to the flame failure device, and that the gas passage is closed, when the supply of the electricity to the flame failure device decreases below a threshold value; and a thermocouple device, that is connected to the flame failure device, and that is configured such that the electricity is supplied to the flame failure device while the respective thermocouple device is exposed to a heat above a threshold temperature. Further, the present disclosure relates to a gas cooktop having such a control arrangement.
  • Gas cooktops usually have a flame failure device (FFD), which may also be referred to as a flame supervision device (FSD).
  • FFD flame failure device
  • FSD flame supervision device
  • flame failure devices are usually configured such that a passage for a gas flow has to be opened by a user and is held open automatically until a flame extinguishes. Then, the flame failure device automatically shuts off the gas flow. Thus, establishing of an explosive atmosphere is prevented.
  • flame failure devices are usually configured such that a passage for a gas flow has to be opened by a user and is held open automatically until a flame extinguishes. Then, the flame failure device automatically shuts off the gas flow. Thus, establishing of an explosive atmosphere is prevented.
  • the control arrangement has a flame failure device, a thermocouple device, and at least one microswitch device.
  • the flame failure device is configured such that, while an electricity is supplied to the flame failure device, a gas passage is held open. Further, the flame failure device is configured such, that, when the supply of the electricity to the flame failure device decreases below a threshold value, the gas passage is closed.
  • the thermocouple device is connected to the flame failure device. The thermocouple device is configured such that, while the thermocouple device is exposed to a heat above a threshold temperature, the electricity is supplied to the flame failure device.
  • Each of the at least one microswitch devices is electrically connected with the thermocouple device and the flame failure device.
  • each of the at least one microswitch devices is configured such that, while a sensor section of the microswitch device is in an extended state, the electricity is supplied between the thermocouple device and the flame failure device. Further, the microswitch device is configured such that, while the sensor section is in a retracted state, the electricity is not supplied between the thermocouple device and the flame failure device.
  • the microswitch device causes a break of the supply of electricity to the flame failure device, if a presence of a part and/or user is detected by the microswitch device.
  • a gas cooktop can react to a presence, which would contradict an ongoing combustion and/or gas flow.
  • a microswitch device preferably is a switch that has a sensor end of the sensor section, wherein the sensor end is configured to contact a part, the presence of which is to be detected.
  • a movement of the sensor end between the extended position and the retracted position may be smaller than 6 mm, preferably smaller than 5 mm, more preferably smaller than 3 mm. That is, a microswitch can detect and react with very high precision.
  • a distance of two inner contacts of the microswitch is, in an open state less than 3 mm, and in particular less than 1 mm.
  • the microswitch device may be arranged in a series connection between the thermocouple device and the flame failure device. In this configuration the microswitch device is preferably arranged along one conductor. This setup is very easy to mount and repair.
  • the microswitch device may be arranged in a series connection with a switch device, that is arranged in a series connection between the thermocouple device and the flame failures device.
  • the switch device which is preferably arranged along a conductor between the thermocouple device and the flame failure device.
  • This setup allows for a versatile usage, which is adaptable to a wide range of use cases.
  • multiple microswitches can be connected to one single switch device.
  • the at least one microswitch device is connected to a control terminal of the switch device, which is configured to control a conductivity between two other terminals of the switch device. Further, the microswitch can easily be place far apart from the thermocouple device.
  • the microswitch device is a mechanically actuated switch, that is configured to control an electricity upon a mechanical input signal.
  • the switch device is an electrical switch device, which is electrically actuated. That is, the switch device is configured to control an electricity upon an electrical input signal. Examples of the switch device comprise a transistor device and an electromechanical switch device.
  • thermocouple device may be in a closed circuit connection with the flame failure device and with the microswitch device or the switch device.
  • the closed circuit connection preferably is free of an external electric power source. That is, the thermocouple device itself is in this case configured to generate an electricity within the closed circuit, when exposed to a high temperature, to make the flame failure device hold open the gas passage.
  • the thermocouple device and the flame failure device together are preferably configured such that an electric current, which can be caused within the thermocouple device by a Seebeck effect upon being exposed to heat, is dimensioned to hold open the gas passage.
  • the advantage of this configuration is the simple way of mounting the control arrangement.
  • thermocouple device for detecting a heat from a burner is not an external electric power source.
  • Each thermocouple device may be in an open circuit connection with an external electric power source, the flame failure device, and with the microswitch device or the switch device.
  • This configuration has the advantage that it is electricity from the external electric power source which drives the flame failure device, while the external electric power source is easily adaptable to requirements of the flame failure device.
  • a loop or circuit having the external electric power source is the open loop or open circuit, while a loop or circuit free from an external electric power source is the closed loop or closed circuit.
  • a preferred and reliable configuration of the flame failure device has a gas valve device, a spring device, an input device, and a holder device.
  • the gas valve device preferably has the gas passage and a piston device.
  • the piston device is preferably movable between a closed position or blocking position of the piston device, where the piston device blocks a gas flow through the gas passage, and an open position of the piston device, where the piston device allows the gas flow through the gas passage.
  • the spring device is preferably configured to preload the piston device to move the piston device from the open position to the closed position.
  • the input device is preferably configured to move, upon a user interaction, the piston device from the closed position to the open position.
  • the holder device is preferably configured to hold the piston device in the open position while an electricity is being supplied the holder device. Examples of the holder device comprise a coil device and a capacitor device.
  • the electricity preferably is an electric current.
  • the flame failure device may preferably be configured such that the gas passage is held open, while an electric current is supplied to the flame failure device, and that the gas passage is closed, when the supply of the electric current to the flame failure device decreases below a threshold value; and the thermocouple device is configured such that the electric current is supplied to the flame failure device while the thermocouple device is exposed to a heat above a threshold temperature.
  • a gas cooktop is presented.
  • the gas cooktop has at least one control arrangement according to any of the above options, as well as at least one burner arrangement.
  • Each thermocouple device is arranged to be exposed to a flame burning from a respective burner.
  • the gas cooktop includes the above control arrangement, it has the respective features and advantages.
  • the gas cooktop may comprise a lid device, that is hinged to the gas cooktop, wherein the microswitch device is arranged such that the sensor section can take its extended position while the lid device is opened, and that the lid device urges the sensor section in its retracted position when and/or while the lid device is closed. Detecting a closed state of the lid device is a preferred scenario for an additional safety function, which is realized by the microswitch device. Thus, a damaging of the lid device by a burning flame and/or a flow of combustible gas after extinguishing a flame by closing the lid device can both be prevented.
  • a glass lid device could easily be damaged by a burning flame.
  • a lid device having a glass section, which is configured to cover at least one of the at least one burners is one preferred use case, which benefits from the microswitch device.
  • the microswitch device may be arranged on a top surface such that the sensor section is in direct connection with the lid device. Due to the direct contact, a reliable and easy-to- use microswitch device placement is provided.
  • the gas cooktop may have a handle device, that is configured to be operated by a user, wherein the handle device is arranged to actuate the microswitch device and to be actuated by the lid device being moved between an open position and a closed position.
  • the handle device is arranged to actuate the microswitch device and to be actuated by the lid device being moved between an open position and a closed position.
  • the lid device may have a connecting link, that is arranged such that the sensor section can take its extended position while the lid device is opened, and that the connecting link urges the sensor section in its retracted position when and/or while the lid device is closed.
  • a connecting link By means of the direct link, a designer gets more freedom in placing the microswitch device.
  • the microswitch device may be hidable below a cover and/or be placed distant from hot regions of the gas cooktop.
  • the microswitch device is arranged at a side face, such that the sensor section is horizontally and/or inclinedly moveable between the extended position and the retracted position.
  • the sensor section is horizontally and/or inclinedly moveable between the extended position and the retracted position.
  • the microswitch device When arranging the microswitch device at a side face and/or providing the connecting link, the microswitch device might be arranged such that the sensor section moves inclinedly upwards from the extended position and the retracted position. This is preferred as it is an especially dirt-unsusceptible arrangement.
  • the gas cooktop has a handle or handle device, that is arranged and configured to operate the microswitch. This configuration may result in a safety mainswitch.
  • Fig. 1 schematically shows a gas cooktop having one exemplary burner and a control arrangement according to a first embodiment of the invention
  • Fig. 2 schematically shows a circuitry of a gas cooktop having five burners and a control arrangement with five flame failure devices according to a second embodiment of the invention
  • Fig. 3 schematically shows a gas cooktop having one exemplary burner and a control arrangement according to a third embodiment of the invention.
  • Fig. 1 shows a first embodiment of the invention by means of an exemplary gas cooktop 2.
  • the gas cooktop 2 has one exemplary control arrangement 4 and one exemplary burner 6.
  • the exemplary control arrangement 4 has a flame failure device 8, a thermocouple device 10, and two exemplary microswitch devices 12, 14.
  • the flame failure device 8 has a gas valve device 15 that has a gas passage 16 and a piston device 18.
  • the burner 6 is in fluid connection with the gas passage 16.
  • the piston device 18 is moveable between an open position, which is shown in Fig. 1, and a closed position.
  • a through hole which is formed in the piston device 18, is in fluid communication with the gas passage 16.
  • the through hole is one example of a piston type.
  • the piston device 18 being placed in the open position allows and/or enables a flow of gas through the gas passage 16 to the burner 6.
  • a solid section of the piston device 18 blocks the gas passage 16.
  • the piston device 18 being placed in the closed position prevents and/or disables a flow of gas through the gas passage 16 and to the burner 6.
  • the piston device 18 has a handle section 20.
  • the handle section 20 is one example for an input device. A user can press the handle section 20 to move the piston device 18 from the closed position to the open position.
  • a spring device 22 is realized as a compression spring, and it is interposed between the handle section 20 and an opposing surface of the gas valve device 15.
  • the spring device 22 is compressed when the piston device 18 is in the open position, and it is at least partly relaxed when the piston device 18 is in the closed position.
  • the spring device 22 is configured to preload the piston device 18 to move the piston device 18 from the open position to the closed position.
  • the piston device 18 further has a plunger section 24.
  • the flame failure device 8 has a coil device 26.
  • the plunger section 24 is arranged within the coil device 26, when the piston device 18 is in the open position.
  • the coil device 26 When electricity is applied to the coil device 26, the coil device 26 generates a magnetic field, which exerts a force on the plunger section 24, which holds the piston device 18 in the open position. When the electricity decreases below a threshold value, the generated magnetic force becomes smaller than a compression force of the spring device 22, and then the piston device 18 is moved into the closed position. As the coil device 26 has a coil, the electricity in this case is an electric current.
  • the coil device 26 is one example of a holder device.
  • an attraction force onto the piston device 18 may generated by supplying a voltage to a capacitor device instead of an electric current to the coil device 26.
  • the coil device 26 is electrically connected to the thermocouple device 10 via conductors 28 and a transistor device 30.
  • the transistor device 30 is configured to electrically connect the thermocouple device 10 with the coil device 26.
  • the transistor device 30 is an example for a switch device.
  • Other examples of the switch device connectable between the thermocouple device 10 and the flame failure device 8 comprise an electromechanical switch.
  • thermocouple device 10 the coil device 26, and the transistor device 30 are connected via the conductors 28 to form a closed circuit. That is, neither of the thermocouple device 10 nor the coil device 26 are connected to an external electric power source.
  • thermocouple device 10 is configured to have a Seebeck effect. That is, if the thermocouple device 10 is exposed to heat, the thermocouple device 10 acts as an internal electric power source, generating an electric current between its terminals.
  • thermocouple device 10 is arranged and connected to hold open the burner 6. If there is a flame of burning gas flowing from the burner 6, then the thermocouple device 10 generates a voltage. The voltage generates an electric current via the transistor device 30 and the coil device 26. This electric current makes the coil device 26 to generate a magnetic field. The magnetic field holds the plunger section 24 in the open position of the piston device 18. The magnetic field is oriented and strong enough to compensate the compression force of the spring device 22. That is, the thermocouple device 10, the coil device 26 and the spring device 22 are dimensioned such that the magnetic field generated by the thermocouple device 10 with the coil device 26 can compensate the compression force from the spring device 22.
  • the transistor device 30, or more generally: the switch device is in a conductive state, where it connects the thermocouple device 10 electrically with the flame failure device 8, when it is supplied with electricity from the microswitch devices 12, 14.
  • the switch device In the first embodiment, for example, there is a series connection of an electric power source 32, the microswitch device 14, the microswitch device 12, and a control terminal of the transistor device 30. That is, the microswitch devices 12, 14 are indirectly electrically connected with the thermocouple device 10 and the flame failure device 8.
  • the microswitch device 12 is a mechanically actuatable switch device for controlling electricity and having a stroke of only 3mm or less between an extended state and a retracted state.
  • the microswitch device 12 In the extended state, where a sensor section 34 of the microswitch device 12 extends from a body 36 of the microswitch device 12, the microswitch device 12 electrically connects the control terminal of the transistor device 30 with the microswitch device 14.
  • the microswitch device 12 In a retracted state, where the sensor section 34 is retracted into the body 36, the microswitch device 12 electrically separates the transistor device 12 from the microswitch device 12.
  • the microswitch device 14 electrically connects in an extended state the electrical power source 32 with the microswitch device 12, and it separates in a retracted state the electrical power source 32 from the microswitch device 12.
  • electricity which is a voltage in this case, is only transferred between the electric power source 32 and the transistor device 30, if both microswitch devices 12, 14 are in the extended state.
  • the microswitch devices 12, 14 preferably each are a normally closed, or normally electrically conductive, switch.
  • the microswitch device 12 is configured to act as a lid safety switch.
  • a lid device 38 is hinged at a top surface 40 of the gas cooktop 2.
  • the microswitch device 12 is mounted at the top surface 40.
  • the microswitch device 12 detects the lid device 38, and doesn't transmit electricity.
  • the microswitch device 12 doesn't detect the lid device 38, and it transmits electricity.
  • no electricity is transmitted to the control terminal of the transistor device 30.
  • no electric current is flowing from the thermocouple device 10 to the flame failure device 8.
  • the spring device 22 moves the piston device 18 to the closed position.
  • no gas flows from the burner 6.
  • the gas cooktop 2 is in a safe state.
  • the microswitch device 14 is configured as a safety main switch.
  • a button 42 is arranged to be moveable between an activated position and a deactivated position. In the activated position, the button 42 is separated from the sensor section 34 of the microswitch device 14, and the sensor section 34 is in the extended position. In the deactivated position, the button 42 presses against the sensor section 34, and the sensor section 34 is in the retracted position.
  • the user can press the button 42 of the safety main switch.
  • the sensor section 34 is moved into the retracted position, and no electricity is transmitted to the control terminal of the transistor device 30.
  • the gas cooktop is in the safe state, where no gas is flowing from the burner 6.
  • the user can pull the button 42 and/or make sure that the button 42 is in the activated state.
  • the Fig. 2 shows a gas cooktop 2 having a control arrangement 4 according to a second embodiment.
  • the gas cooktop 2 has five burners 6, each of which is equipped with a thermocouple device 10 and a flame failure device 8 having a coil device 26.
  • the control arrangement 4 thus has five thermocouple devices 10, five flame failure devices 8, and two microswitch devices 12, 14.
  • thermocouple device 10 is connected to the respective flame failure device 8 of the corresponding burner 6 in a closed circuit having interposed a transistor device 30 acting as a switch device. That is, the circuitry shown in Fig. 2 is a combination of three circuit types, being a) the series circuit of the electric power source 32 and the microswitch devices 12, 14, b) the five closed loop circuits, and c) a star circuit connecting the five transistor devices 30 with the series circuit. As a result, each of the two microswitch devices 12, 14 is arranged such that a gas supply to all five burners 6 can safely be terminated.
  • Fig. 3 The third embodiment is illustrated in Fig. 3.
  • Fig. 3 is shown, for illustrative purposes, only the microswitch device 12, but not the microswitch device 14.
  • the microswitch device 12 is connected between the thermocouple device 10 and the flame failure device 8. That is, the microswitch device 12 is directly electrically connected with the thermocouple device 10 and the flame failure device 8.
  • the direct electrical connection may also be realized with more than one microswitch devices.

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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)

Abstract

La présente invention concerne un agencement de commande (4) pour une table de cuisson à gaz (2), comprenant : un dispositif de défaillance de flamme (8), qui est conçu de telle sorte que, tandis que de l'électricité est fournie au dispositif de défaillance de flamme, un passage de gaz (16) est maintenu ouvert, et que, lorsque l'alimentation de l'électricité diminue au-dessous d'une valeur seuil, le passage de gaz (16) est fermé ; un dispositif de thermocouple (10), qui est raccordé au dispositif de défaillance de flamme (8), et qui est conçu de telle sorte que, pendant que le dispositif de thermocouple est exposé à une chaleur au-dessus d'une température seuil, l'électricité est fournie ; un dispositif de microrupteur (12, 14), qui est électriquement raccordé au dispositif de thermocouple et au dispositif de défaillance de flamme, et qui est conçu de telle sorte que, tandis qu'une section capteur (34) du dispositif de microrupteur est dans un état étendu, l'électricité est fournie, et que, tandis que la section capteur est dans un état rétracté, l'électricité n'est pas fournie.
PCT/EP2024/053489 2023-02-15 2024-02-12 Agencement de commande doté d'un microrupteur Ceased WO2024170499A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP23382146 2023-02-15
EP23382146.1 2023-02-15

Publications (1)

Publication Number Publication Date
WO2024170499A1 true WO2024170499A1 (fr) 2024-08-22

Family

ID=85278220

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/053489 Ceased WO2024170499A1 (fr) 2023-02-15 2024-02-12 Agencement de commande doté d'un microrupteur

Country Status (1)

Country Link
WO (1) WO2024170499A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182137A (en) * 1985-10-30 1987-05-07 Ti New World Ltd Cookers and hobs
GB2344877A (en) * 1998-12-18 2000-06-21 Stoves Group Plc Gas appliance
CN2765082Y (zh) * 2003-05-22 2006-03-15 上海雄安锁具有限公司 一种可控制的热电偶式电磁气阀
WO2011147530A2 (fr) * 2010-05-27 2011-12-01 Electrolux Home Products Corporation N.V. Appareil de cuisine à gaz
EP2578947A1 (fr) * 2011-10-03 2013-04-10 Indesit Company S.p.A. Cuisinière à gaz avec un mécanisme de sécurité
WO2019077740A1 (fr) * 2017-10-20 2019-04-25 株式会社立山科学センサーテクノロジー Dispositif de gestion de combustion de gaz

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182137A (en) * 1985-10-30 1987-05-07 Ti New World Ltd Cookers and hobs
GB2344877A (en) * 1998-12-18 2000-06-21 Stoves Group Plc Gas appliance
CN2765082Y (zh) * 2003-05-22 2006-03-15 上海雄安锁具有限公司 一种可控制的热电偶式电磁气阀
WO2011147530A2 (fr) * 2010-05-27 2011-12-01 Electrolux Home Products Corporation N.V. Appareil de cuisine à gaz
EP2578947A1 (fr) * 2011-10-03 2013-04-10 Indesit Company S.p.A. Cuisinière à gaz avec un mécanisme de sécurité
WO2019077740A1 (fr) * 2017-10-20 2019-04-25 株式会社立山科学センサーテクノロジー Dispositif de gestion de combustion de gaz

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