WO2023072482A1 - Procédé de fonctionnement d'un brûleur à gaz à double circuit, unité de commande, brûleur à gaz à double circuit et cuisinière à gaz - Google Patents

Procédé de fonctionnement d'un brûleur à gaz à double circuit, unité de commande, brûleur à gaz à double circuit et cuisinière à gaz Download PDF

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Publication number
WO2023072482A1
WO2023072482A1 PCT/EP2022/076191 EP2022076191W WO2023072482A1 WO 2023072482 A1 WO2023072482 A1 WO 2023072482A1 EP 2022076191 W EP2022076191 W EP 2022076191W WO 2023072482 A1 WO2023072482 A1 WO 2023072482A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
burner
ring
burner ring
gas flow
Prior art date
Application number
PCT/EP2022/076191
Other languages
English (en)
Inventor
Luis Acosta Herrero
Luis Antonio Palacios Valdueza
Emilio Placer Maruri
Mario VELO BEZANILLA
Original Assignee
BSH Hausgeräte 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 Hausgeräte GmbH filed Critical BSH Hausgeräte GmbH
Priority to CN202280072395.9A priority Critical patent/CN118234995A/zh
Priority to EP22793416.3A priority patent/EP4423431A1/fr
Publication of WO2023072482A1 publication Critical patent/WO2023072482A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/22—Timing network
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/02—Controlling two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/10—High or low fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/08—Household apparatus

Definitions

  • the present invention relates to a method of operating a dual circuit gas burner. It further relates to a control unit for adjusting a gas flow to a dual circuit gas burner, to a dual circuit gas burner and to a gas stove.
  • dual circuit gas burners including an inner and an outer burner ring.
  • Such dual circuit gas burners generally possess a greater maximum burner power than gas burners with a single burner ring. Further, dual circuit gas burners can have an especially large spread between minimum burner power and maximum burner power.
  • US 2013/0056663 A1 shows an example of a dual circuit gas burner and of a corresponding gas valve unit, which allows first opening a gas outlet to the inner burner and subsequently opening a gas outlet to the outer burner while the flames of the inner burner are burning at their maximum size.
  • a method of operating a dual circuit gas burner including an inner and an outer burner ring surrounding the inner burner ring includes: opening a gas flow to the outer burner ring while maintaining a gas flow to the inner burner ring closed during a predetermined period of time.
  • Opening a gas flow to the outer burner ring while maintaining a gas flow to the inner burner ring closed allows increasing the quantity of secondary air provided to the outer burner ring. This ensures that the outer burner receives enough secondary air for combustion and in particular prevents that the flame at the outer burner ring extinguishes. In detail, it can be prevented that the inner burner ring affects the flow of secondary air to the outer burner ring. Thereby, a balanced secondary aeration can be achieved at the outer burner ring. A combustion reliability of the outer burner ring can be improved. A safety of the dual circuit gas burner is increased because it can be ensured that the flame does not extinguish while gas is flowing.
  • the gas (in particular, the gas provided in the gas flow) provided to the inner and/or outer burner ring comprises a fuel gas.
  • the gas (in particular, the gas provided in the gas flow) can be a mixture of a fuel gas, such as acetylene, natural gas or propane, with an oxidizer, such as ambient air, supplied oxygen or the like.
  • a fuel gas such as acetylene, natural gas or propane
  • an oxidizer such as ambient air, supplied oxygen or the like.
  • a gas mixture can be referred to as a combustible gas mixture.
  • the gas (in particular, the gas provided in the gas flow) is not solely made of ambient air.
  • primary air is the air which is to be mixed with the gas for providing a combustible gas mixture before the combustion.
  • a mixing may be carried out below a plate, in particular top sheet, of a gas stove on which the dual circuit gas burner is arranged.
  • the primary air and the gas may be mixed in a Venturi tube.
  • secondary air is the air which is provided during combustion for maintaining the combustion. A deficiency of secondary air may lead to a lapse of the flames.
  • the dual circuit gas burner is also referred to as "the gas burner” in the following.
  • the dual circuit gas burner can be a double crown burner.
  • the dual circuit gas burner can be construed as a gas burner configured to provide at least circularly arranged outer flames (with the outer burner ring) and circularly arranged inner flames (with the inner burner ring).
  • Circularly arranged outer and inner burner rings can be construed as a double crown.
  • the outer and inner burner rings can be circular, rectangular, hexagonal, octagonal, elliptical, kidney shaped and the like when looking from above.
  • the outer and inner burner rings are arranged concentrically.
  • gas outlet openings of the outer burner ring and gas outlet openings of the inner burner ring are arranged concentrically.
  • the term “outer” can also be referred to as a “external” and the term “inner” can also be referred to as “internal”.
  • the gas burner may include more than two rings. Opening a gas flow to the outer burner ring in particular means that a gas (preferably a combustible gas mixture) is provided to the outer burner ring. Upon reaching the outer burner ring, the gas may be ignited and form flames at the gas outlet openings of the outer burner ring.
  • the gas flow to the inner burner ring is closed. This in particular means that no gas is provided to the inner burner ring during the predetermined period of time. This means that no flames are formed at the gas outlet opening of the inner burner ring.
  • the inner burner is not provided with gas.
  • the outer burner ring provides a flame while the inner burner ring does not provide a flame.
  • the state in which the gas flow to the outer burner ring is opened while the gas flow to the inner burner ring is maintained closed is a normal operating state of the gas burner and is not a state in which one of the burner rings is malfunctioning.
  • the predetermined period of time may be any duration during which the gas flow to the outer burner ring is open while the gas flow to the inner burner ring is closed.
  • the duration of the predetermined period of time can be preset, for example in accordance with experiments determining a duration of the predetermined period of time for which the best combustion at the outer burner ring and/or the best secondary air balance is achieved.
  • the predetermined period of time may vary depending on an operation of the dual circuit gas burner by a user thereof.
  • the predetermined period of time may have a minimum duration, which is for example preset.
  • the predetermined period of time may be between 3 and 20 seconds, preferably between 5 and 10 seconds.
  • the predetermined period of time is a duration between an outer burner opening time at which the gas flow to the outer burner ring is opened and an inner burner opening time at which the gas flow to the inner burner ring is opened.
  • the method further includes: opening a gas flow to the inner burner ring at an inner burner opening time which is the predetermined period of time later than an outer burner opening time at which the gas flow to the outer burner ring is opened.
  • Opening a gas flow to the inner burner ring in particular means that a gas (preferably a combustible gas mixture) is provided to the inner burner ring. Upon reaching the inner burner ring, the gas may be ignited and form flames at the gas outlet openings of the inner burner ring.
  • a gas preferably a combustible gas mixture
  • the gas flow to the inner burner ring is opened after a predetermined period of time has elapsed since the outer burner opening time, thereby ensuring a balanced secondary air flow.
  • the outer burner ring is at a maximum opening state or at a predetermined intermediate opening state.
  • the maximum opening state of the outer burner ring can be a state at which a gas flow to the outer burner ring is maximum, leading to the largest possible flames on the outer burner ring.
  • the predetermined intermediate opening state of the outer burner ring can be a state at which a gas flow to the outer burner ring is above minimum but below maximum, leading to flames of intermediate size on the outer burner ring. In particular, the larger the flames at the time of opening the inner burner ring, the more stable they are and the more unlikely they are to extinguish.
  • the method further includes: varying the gas flow to the outer burner ring during the predetermined period of time.
  • the gas burner can be used normally for cooking purposes, but only with the outer burner ring.
  • the gas flow to the outer burner ring is varied in accordance with a user's setting.
  • the step of varying the gas flow to the outer burner ring during the predetermined period of time includes: increasing the gas flow to the outer burner ring during a first portion of the predetermined period of time; and decreasing the gas flow to the outer burner ring during a second portion of the predetermined period of time which is subsequent to the first portion.
  • a control unit for adjusting a gas flow to a dual circuit burner including an inner and an outer burner ring.
  • the control unit includes a gas valve unit including: an adjustable outer burner outlet for adjustably providing the outer burner ring with gas; and an adjustable inner burner outlet for adjustably providing the inner burner ring with gas; wherein the gas valve unit is configured to open the adjustable outer burner outlet to provide the outer burner ring with a gas flow while maintaining the adjustable inner burner outlet closed during a predetermined period of time.
  • the gas valve unit can include one or two valves.
  • the gas valve unit may be realized as an electromagnetic valve unit (with one or two electromagnetic valves).
  • the valve(s) selectively open or close the adjustable outer burner outlet and the adjustable inner burner outlet to allow gas flowing out of the adjustable outer and inner burner outlets.
  • the adjustable outer burner outlet can be connected to the outer burner ring, for example through a pipe, so that when gas flows out of the adjustable outer burner outlet, it is lead to the outer burner ring for combustion.
  • the adjustable inner burner outlet can be connected to the inner burner ring, for example through a pipe, so that when gas flows out of the adjustable inner burner outlet, it is lead to the inner burner ring for combustion.
  • the gas valve unit allows opening a gas flow to the outer burner ring while maintaining a gas flow to the inner burner ring closed, thereby increasing the quantity of secondary air provided to the outer burner ring.
  • This ensures that the outer burner receives enough secondary air for combustion and in particular prevents that the flame at the outer burner ring extinguishes.
  • it can be prevented that the inner burner ring affects the flow of secondary air to the outer burner ring.
  • a combustion reliability of the outer burner ring can be improved. This allows improving a safety of the dual circuit gas burner because it can be ensured that the flame does not extinguish while gas is flowing.
  • the order in which the gas valve unit opens and closes the adjustable burner outlets can be preprogrammed and/or controlled in line with a stored curve or table, or mechanically predefined by the manner the gas valve unit functions.
  • control unit is configured to operate according to the method of the first aspect or of any embodiment thereof.
  • control unit further includes: a control knob which is rotatable by a user; wherein the adjustable outer burner outlet and the adjustable inner burner outlet are configured to adjust their gas outlets to the outer and inner burner rings as a function of the position of the control knob.
  • the quantity of gas output to the inner and outer burner rings depends on the position of the control knob.
  • the quantity of gas output to the inner and outer burner rings depends solely on the position of the control knob.
  • each position of the control knob discrete position or not corresponds to a particular opening state of the adjustable outer burner outlet and to a particular opening state of the adjustable inner burner outlet.
  • the gas valve unit is configured to vary a total gas flow to the inner burner ring and the outer burner ring smoothly upon rotation of the control knob.
  • Smoothly in particular means that there are no sudden jumps in the quantity of gas output to the inner and outer burner rings upon rotation of the control know.
  • the total gas flow increases smoothly while when the control knob is rotated in the opposite direction, the total gas flow decreases smoothly.
  • the predetermined period of time is defined by a duration at which the control knob is maintained in a position corresponding to opening the adjustable outer burner outlet while maintaining the adjustable inner burner outlet closed.
  • a dual circuit gas burner for a gas stove includes: the control unit according to the second aspect or any embodiment thereof; an inner burner ring connected to the adjustable inner burner outlet and configured to receive gas in accordance with an opening state of the adjustable inner burner outlet; and an outer burner ring connected to the adjustable outer burner outlet and configured to receive gas in accordance with an opening state of the adjustable inner burner outlet.
  • a gas stove having a dual circuit gas burner according to the third aspect, and a plate having an upper surface on which the dual circuit gas burner is mounted is provided.
  • Fig. 1 shows a gas stove according to an embodiment
  • Fig. 2 shows a dual circuit gas burner according to an embodiment
  • Fig. 3 shows a control unit according to an embodiment
  • Fig. 4 shows an operation of a gas burner known from the prior art
  • Fig. 5 shows a method of operating a dual circuit gas burner according to an embodiment
  • Fig. 6 shows an operation of a gas burner according to a first example
  • Fig. 7 shows an operation of a gas burner according to a second example
  • Fig. 8 shows an operation of a gas burner according to a third example.
  • Fig. 1 shows a gas stove 100 viewed from above.
  • the gas stove 100 includes a plate 101 with an upper surface 102.
  • Four dual circuit gas burners 1 are arranged on the upper surface 102.
  • the gas burners 1 are different in size but their operation is identical.
  • the upper surface 102 further has four control knobs 103 arranged thereon, which can be rotated by a user to adjust the gas flow to the respective gas burners 1 , as will be explained further below.
  • Fig. 2 shows an example of a dual circuit gas burner 1 for the gas stove 100 of Fig. 1.
  • the gas burner 1 shown in Fig. 2 includes an outer burner ring 2 having a circular shape.
  • Outer gas outlet openings 3 are arranged along an outer perimeter of the outer burner ring 2 such as to emit flames radially outwards.
  • the gas burner 1 of Fig. 2 further includes an inner burner ring 4 having a circular shape.
  • Inner gas outlet openings 5 are arranged along an outer perimeter of the inner burner ring 4 such as to emit flames radially outwards.
  • Fig. 3 shows a control unit 20 for adjusting a gas flow to the gas burner 1.
  • the control unit 20 includes a gas valve unit 14.
  • the gas valve unit 14 comprises a main gas line 6 providing gas or a gas mixture to the gas burner 1.
  • a main gas valve 7 is arranged in the main gas line 6.
  • a branch line 8 to the outer burner ring 2 and a branch line 9 to the inner burner ring 4 branch off from the main gas line 6 downstream of the main gas valve 7.
  • an on/off valve 10 which can be designed as a solenoid valve, for example, as well as a control valve 11.
  • the opening cross-section of the respective branch line 8, 9 and thus the size of the gas flow to the external burner 2 or to the internal burner 4 can be adjusted steplessly or in several stages.
  • the control valves 11 can, for example, each be driven by a stepper motor. In addition to adjusting the opening cross-section in each of the branch lines 8, 9, it is also possible to clock the gas flow in the branch lines 8 and/or 9. This means that the gas flow to the outer burner ring 2 or to the inner burner ring 4 is completely interrupted and reopened at predetermined times. This can be done, for example, by opening and closing the on/off valve 10 or by opening and closing the control valve 11 in the corresponding branch line 8, 9.
  • valves 10, 11 of the branch line 8 to the outer burner ring 2 allow to adjustably provide the outer burner ring 2 with gas.
  • This gas is provided through an adjustable outer burner outlet 16 located on the branch line 8 downstream of the valve 11.
  • valves 10, 11 of the branch line 9 to the inner burner ring 4 allow to adjustably provide the inner burner ring 4 with gas.
  • This gas is provided through an adjustable inner burner outlet 15 located on the branch line 9 downstream of the valve 11.
  • the main gas valve 7 as well as the on/off valves 10 and the control valves 11 are controlled by means of a preferably electronic control unit 12, which is connected to the valves 7, 10, 11 via control lines 13.
  • the electronic control unit 12 can be coupled to the control knob 103 and send a control signal through the control lines 13 as a function of the position of the control knob 103 set by the user, thereby selecting the gas flow to the outer and inner burner 2, 4.
  • Fig. 4 shows an example of an operation of a gas burner 1 in the prior art.
  • Fig. 4 comprises three parts: (a), (b) and (c), wherein part (a) represents the power (in kW) of the outer burner ring 2, part (b) represents the power (in kW) of the inner burner ring 4, and part (c) represents the total power (in kW) of the gas burner 1 , namely an addition of the power of both burner rings 2, 4.
  • the power output by the burner 1 and the burner rings 2, 4 is proportional to the gas flow provided to the burner 1 and burner rings 2, 4.
  • the horizontal axis of Fig. 4 shows an evolution of the operation of the gas burner 1 as the control knob 103 is rotated.
  • the gas burner 1 is "OFF", which indicates that no gas is reaching the inner or outer burner 2, 4.
  • the gas burner 1 is turned on.
  • the inner burner ring 4 is provided with gas and continuously maintained with gas while the outer burner ring 2 is provided with gas.
  • a gas flow to the inner burner ring 4 is open at all times while the gas flow to the outer burner ring 2 is open.
  • the gas flow to the inner burner ring 4 is at its maximum Max(b).
  • zone Z1 of Fig. 4 through rotation of the control knob 103, the gas flow to the outer gas burner 2 is increased until the outer burner ring 2 reaches its maximum Max(a).
  • the total power of the gas burner 1 is maximum Max(c) when the outer burner ring 2 reaches its maximum Max(a).
  • the gas flow to the inner burner ring 4 is always open when the gas flow to the outer burner ring 2 is open.
  • the inner burner ring 4 can however disturb the secondary air flow to the outer burner ring 2. As a result, there is a risk that the flame at the outer burner ring 2 is extinguished due to the lack of secondary air.
  • the gas burner 1 is advantageously operated according to the operation method shown in Fig. 5.
  • a gas flow to the outer burner ring 2 is opened while maintaining a gas flow to the inner burner ring 4 closed during a predetermined period of time.
  • This is achieved by keeping the valves 10, 11 of the branch line 9 to the inner burner ring 4 closed while opening the valves 10, 11 of the branch line 8 to the outer burner ring 2.
  • it is prevented that the inner burner ring 4 interferes with the secondary air to the outer burner ring 2.
  • the gas flow to the inner burner ring 4 is opened after the predetermined period of time has elapsed since the gas flow to the outer gas burner ring 2 was opened. This is achieved by opening the valves 10, 11 of the branch line 9 to the inner burner ring 4 while keeping the valves 10, 11 of the branch line 8 to the outer burner ring 2 open.
  • the control of the operation of the valves 10, 11 is performed by the control unit 12 in response to a position of the control knob 103.
  • Fig. 6 shows an example of an operation and power output of the gas burner 1.
  • the structure of Fig. 6 is similar to that of Fig. 4, and in particular also includes three parts (a), (b) and (c) corresponding to the outer burner ring 2, the inner burner ring 4 and the entire gas burner 1.
  • Fig. 6 further shows a time axis showing labels at which particular events occur, as will be detailed below.
  • the predetermined period of time T has elapsed, which corresponds to a user rotating the control knob 103 beyond a predetermined position.
  • the time t 2 marks the opening of the gas flow to the inner burner ring 4 and can be designated as the inner burner opening time t 2 .
  • the total power to the gas burner 1 increases again.
  • the gas flow to the outer burner ring 2 is decreased further while the gas flow to the inner burner ring 4 remains constant. This results in a decreasing power of the gas burner 1.
  • the gas flow to the outer burner ring 2 decreases until it is entirely off ("Int" state in Fig. 6).
  • the gas flow to the inner burner ring 4 is reduced further until it reaches its minimum Min.
  • the operation of the gas burner 1 shown in Fig. 6 is a mere example and different operations are possible, as shown in Fig. 7 and 8, for example.
  • the inner burner ring 4 is opened at the time at which the gas flow to the outer burner ring 2 is maximum Max(a).
  • the total maximum Max(c) output of the gas burner 1 is higher than in the example of Fig. 6, because the addition of the power of the inner burner ring 4 to power of the outer burner ring 2 occurs before the power of the outer burner ring 2 is decreased again. This results in a smoother operation curve as compared to the curve of Fig. 6.
  • Fig. 8 is similar to the example of Fig. 6, wherein the power through the outer burner ring 2 is set such as to be the same as the power of opening the inner burner ring 4. This results in a smoother operation curve as compared to the curve of Fig. 6.
  • control unit 20 can be different from the control unit shown in Fig. 3.
  • control unit 20 may include only the valves 11 but not the valves 10.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

La présente invention concerne un procédé de fonctionnement d'un brûleur à gaz à double circuit (1) comprenant une bague de brûleur interne (4) et une bague de brûleur externe (2) entourant la bague de brûleur interne (4) ; le procédé consistant à : ouvrir (S1) un écoulement de gaz vers la bague de brûleur externe (2) tout en maintenant un écoulement de gaz vers la bague de brûleur interne (4) fermée pendant une période de temps prédéfinie (T).
PCT/EP2022/076191 2021-10-29 2022-09-21 Procédé de fonctionnement d'un brûleur à gaz à double circuit, unité de commande, brûleur à gaz à double circuit et cuisinière à gaz WO2023072482A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280072395.9A CN118234995A (zh) 2021-10-29 2022-09-21 操作双回路气体燃烧器的方法、控制单元、双回路气体燃烧器和燃气炉
EP22793416.3A EP4423431A1 (fr) 2021-10-29 2022-09-21 Procédé de fonctionnement d'un brûleur à gaz à double circuit, unité de commande, brûleur à gaz à double circuit et cuisinière à gaz

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP21382977.3 2021-10-29
EP21382977 2021-10-29

Publications (1)

Publication Number Publication Date
WO2023072482A1 true WO2023072482A1 (fr) 2023-05-04

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PCT/EP2022/076191 WO2023072482A1 (fr) 2021-10-29 2022-09-21 Procédé de fonctionnement d'un brûleur à gaz à double circuit, unité de commande, brûleur à gaz à double circuit et cuisinière à gaz

Country Status (3)

Country Link
EP (1) EP4423431A1 (fr)
CN (1) CN118234995A (fr)
WO (1) WO2023072482A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2189719A2 (fr) * 2008-11-20 2010-05-26 BSH Bosch und Siemens Hausgeräte GmbH Procédé de réglage d'une puissance de chauffe dans un brûleur à plusieurs couronnes, notamment brûleur à deux couronnes, ainsi que dispositif d'exécution d'un tel procédé
EP2312212A2 (fr) * 2009-10-14 2011-04-20 BSH Bosch und Siemens Hausgeräte GmbH Poste de cuisson au gaz doté d'un brûleur à deux circuits
US20130056663A1 (en) 2010-05-20 2013-03-07 BSH Bosch und Siemens Hausgeräte GmbH Gas valve unit for a dual circuit burner
US20210102700A1 (en) * 2019-10-03 2021-04-08 Haier Us Appliance Solutions, Inc. Delayed ignition prevention in a multi-ring gas burner for a cooktop appliance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2189719A2 (fr) * 2008-11-20 2010-05-26 BSH Bosch und Siemens Hausgeräte GmbH Procédé de réglage d'une puissance de chauffe dans un brûleur à plusieurs couronnes, notamment brûleur à deux couronnes, ainsi que dispositif d'exécution d'un tel procédé
EP2312212A2 (fr) * 2009-10-14 2011-04-20 BSH Bosch und Siemens Hausgeräte GmbH Poste de cuisson au gaz doté d'un brûleur à deux circuits
US20130056663A1 (en) 2010-05-20 2013-03-07 BSH Bosch und Siemens Hausgeräte GmbH Gas valve unit for a dual circuit burner
US20210102700A1 (en) * 2019-10-03 2021-04-08 Haier Us Appliance Solutions, Inc. Delayed ignition prevention in a multi-ring gas burner for a cooktop appliance

Also Published As

Publication number Publication date
EP4423431A1 (fr) 2024-09-04
CN118234995A (zh) 2024-06-21

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