EP3479022B1 - Gas burner and domestic cooking appliance - Google Patents

Description

The present invention relates to a gas burner for a domestic cooking appliance and a domestic cooking appliance with such a gas burner.

Gas burners for household cooking appliances comprise a burner lower part in which a mixing chamber is provided, a nozzle holder which has a gas nozzle for injecting fuel gas into the mixing chamber, and a burner cover placed on the burner lower part which has mixture outlet openings. When the fuel gas is injected into the mixing chamber, primary air is sucked in laterally between the gas nozzle and a lower edge of the mixing chamber and mixed with the fuel gas. The fuel gas / primary air mixture is fed to a mixture distribution chamber provided between the lower part of the burner and the burner cover and is evenly distributed by this to the mixture outlet openings to form a flame.

The DE 199 05 198 A1 describes a gas burner which has two gas-air mixture supply chambers arranged one above the other, both of which provide a main and preferably holding flame and an extremely low simmer flame through a separate gas inlet attached to a burner head underside with a gas-air mixture device for forming the gas-air mixture. An upper burner ring of the upper gas-air mixture supply chamber has gas outlet openings on its outer diameter that generate the main and preferably holding flame, and a second burner ring of the lower gas-air mixture supply chamber located below the upper burner ring has an all-round gap-shaped gas outlet opening on its outer diameter of the burner head, which generates the simmer flame, the two outer diameters of the burner rings in the flame area being the same size.

The DE 199 07 273 A1 describes a gas burner with a simmering burner. The gas burner comprises a burner head and a burner cover as well as an injector assigned to the burner head with a vertical nozzle holder and a gas connection. In the burner head there is a receptacle for an additional Simmerburner arranged essentially on the outside edge and a wall element which is assigned to this area and forms a half-chamber is arranged on the cover.

Against this background, it is an object of the present invention to provide an improved gas burner.

Accordingly, a gas burner for a domestic cooking appliance is proposed. The gas burner comprises a first mixture distribution chamber, which has a large number of mixture outlet openings, and a second mixture distribution chamber separate from the first mixture distribution chamber, the second mixture distribution chamber being in fluid connection with the mixture outlet openings of the first mixture distribution chamber, so that both a fuel gas / primary air mixture when the gas burner is in operation from the first mixture distribution chamber as well as a fuel gas / primary air mixture from the second mixture distribution chamber can be conducted out of the gas burner with the aid of the mixture outlet openings for flame formation.

The gas burner is in particular a household appliance gas burner. The household appliance is in particular a gas stove or part of a gas stove. The fuel gas / primary air mixture is a mixture of fuel gas, for example natural gas, and primary air supplied to the gas burner. Air, in particular the aforementioned primary air and secondary air, is required for burning the fuel gas. In particular, the fuel gas is injected into a mixing chamber of the gas burner, a Venturi effect being created by injecting the fuel gas and the primary air being sucked into the mixing chamber and mixed with the fuel gas. In contrast to this, the secondary air is the air that is required to burn the primary air / fuel gas mixture emerging from the gas burner. The fuel gas / primary air mixture can also be referred to below as a gas mixture or mixture.

The fuel gas / primary air mixture exits through the mixture outlet openings when the gas burner is in operation. The mixture outlet openings can therefore also be referred to as fuel gas / primary air mixture outlet openings, gas mixture outlet openings or gas outlet openings. The first mixture distribution chamber is set up in particular to distribute the fuel gas / primary air mixture evenly over the mixture outlet openings. The first mixture distribution chamber can also be referred to as the first fuel gas / primary air mixture distribution chamber or the first gas mixture distribution chamber. The second mixture distribution chamber can also be referred to as a second fuel gas / primary air mixture distribution chamber or a second gas mixture distribution chamber.

The EP 2572141 A2 describes a gas burner for a domestic cooking appliance, with a mixture distribution chamber which has a large number of mixture outlet openings, so that when the gas burner is in operation, a fuel gas / primary air mixture can be guided out of the mixture distribution chamber with the aid of the mixture outlet openings for flame formation from the gas burner with at least two gas nozzles for injecting fuel gas into the mixture distribution chamber.

The first mixture distribution chamber and the second mixture distribution chamber are preferably arranged together in a burner housing of the gas burner. In particular, the first mixture distribution chamber and the second mixture distribution chamber are designed as spatially separated cavities or cavities in the burner housing. The burner housing can have a large number of individual parts. The fact that the first mixture distribution chamber is separated from the second mixture distribution chamber means that a part of the burner housing of the gas burner is arranged between the first mixture distribution chamber and the second mixture distribution chamber. In other words, the first mixture distribution chamber is spatially separated from the second mixture distribution chamber. However, this does not rule out a fluidic connection between the mixture distribution chambers. However, the first mixture distribution chamber can also be separated from the second mixture distribution chamber in such a way that there is no fluidic connection between the two mixture distribution chambers. In other words, the fuel gas / primary air mixture cannot flow from the first mixture distribution chamber into the second mixture distribution chamber and vice versa in this case. Alternatively, the first mixture distribution chamber and the second mixture distribution chamber can be spatially separated from one another, but be in fluid communication with one another. For example, at least one connection, for example a bore or a channel, can be provided between the two mixture distribution chambers, which connection enables a fluid exchange.

The number of mixture outlet openings is arbitrary. The mixture outlet openings are preferably arranged distributed uniformly over a circumference of a burner cover of the burner housing of the gas burner. The mixture outlet openings open directly into the first mixture distribution chamber. This means that the first mixture distribution chamber is connected directly, that is to say without interposed bores or channels, to the mixture outlet openings. The fact that the second mixture distribution chamber is in fluid connection with the mixture outlet openings of the first mixture distribution chamber is to be understood as meaning that a fuel gas / primary air mixture received in the second mixture distribution chamber can flow from the second mixture distribution chamber to the mixture outlet openings. It is possible that the fuel gas / primary air mixture flows from the second mixture distribution chamber into the first mixture distribution chamber and is distributed by this to the mixture outlet openings. Alternatively or in addition, it is also possible for the second mixture distribution chamber to be connected directly to the mixture outlet openings via additional connecting channels. In this case it flows Combustion gas / primary air mixture directly from the second mixture distribution chamber via the connecting channels into the mixture outlet openings in order to exit the gas burner through them.

Thus, only a large number, in particular a row or a burner ring, of mixture outlet openings is provided for both mixture distribution chambers. This means that a separate multiplicity of mixture outlet openings is not provided for each mixture distribution chamber. With the help of the different mixture distribution chambers, the gas burner can be operated in different operating states. For example, in a minimal fire operation or simmer operation, the fuel gas / primary air mixture can only be distributed from the second mixture distribution chamber via the mixture outlet openings. This results in a particularly simple and compact design of the gas burner compared to known gas burners. Furthermore, the output of the gas burner can be set particularly well and precisely in minimum fire operation.

According to one embodiment, at least one connection channel is provided which fluidly connects the second mixture distribution chamber to the mixture outlet openings of the first mixture distribution chamber.

Each mixture outlet opening is preferably assigned at least one and in particular precisely one such connection channel. That is to say, a plurality of connecting channels is preferably provided, which are arranged distributed uniformly over a circumference of the gas burner. The at least one connection channel is provided in the burner housing. The second mixture distribution chamber is set up in particular to distribute the fuel gas / primary air mixture evenly over the connecting ducts.

According to a further embodiment, the first mixture distribution chamber is arranged above the second mixture distribution chamber with respect to a direction of gravity.

The first mixture distribution chamber and / or the second mixture distribution chamber can each be designed in an annular manner. The mixture distribution chambers can have an identical volume or different volumes. Alternatively, the first mixture distribution chamber can also be arranged below the second mixture distribution chamber with respect to the direction of gravity.

According to a further embodiment, the gas burner comprises a first mixing chamber for mixing fuel gas with primary air, the first mixing chamber being in direct fluid connection with the first mixture distribution chamber, and a second mixing chamber, which is separate from the first mixing chamber, for mixing fuel gas with primary air, the second mixing chamber is in direct fluid communication with the second mixture distribution chamber.

The mixing chambers are preferably cylindrical. Each mixing chamber has a lower edge at which primary air is sucked into the respective mixing chamber. The fact that the respective mixing chamber is in direct fluid connection with the mixture distribution chamber assigned to it is to be understood as meaning that the first mixing chamber opens into the first mixture distribution chamber or that the second mixing chamber opens into the second mixture distribution chamber. That is, between the first mixing chamber and the first mixture distribution chamber or between the second mixing chamber and the second mixture distribution chamber, no additional lines, pipes, channels, bores or the like are provided.

According to a further embodiment, a volume of the first mixing chamber is greater than a volume of the second mixing chamber.

For example, the volume of the first mixing chamber can be twice as large, three times as large, four times as large or five times as large as that of the second mixing chamber.

According to a further embodiment, the gas burner comprises a first gas nozzle for injecting fuel gas into the first mixing chamber and a second gas nozzle for injecting fuel gas into the second mixing chamber.

The gas nozzles are preferably each arranged centrally with respect to the mixing chamber assigned to them. The first gas nozzle is arranged completely outside the first mixing chamber and the second gas nozzle is arranged completely outside the second mixing chamber. That is, a distance is provided between the respective gas nozzle and the mixing chamber assigned to it. The primary air is sucked in between the respective gas nozzle and the lower edge of the mixing chamber assigned to the respective gas nozzle. The fuel gas is mixed with the primary air in the mixing chambers. The premixed fuel gas / primary air mixture is then fed into the respective mixture distribution chamber and can be mixed further there. In this way, a particularly homogeneous fuel gas / primary air mixture is achieved.

According to a further embodiment, the gas burner comprises an intermediate element which is part of a burner housing of the gas burner and which separates the first mixture distribution chamber from the second mixture distribution chamber.

The intermediate element is preferably disk-shaped and has a central cylindrical base section. The intermediate element can be designed to be rotationally symmetrical to a symmetry or central axis of the gas burner.

According to a further embodiment, the at least one connecting channel is a bore provided in the intermediate element or a groove provided on an edge section of the intermediate element.

The connecting channel can have a circular, square, rectangular, triangular or any cross section. A plurality of connecting channels is preferably provided, which are arranged distributed uniformly over a circumference of the intermediate element. The connecting channels preferably each open directly into the mixture outlet openings assigned to them.

According to a further embodiment, the first mixing chamber is arranged at least partially in the intermediate element.

In particular, the first mixing chamber is arranged in a base section of the intermediate element. The first mixing chamber is constructed in particular rotationally symmetrical to the central axis of the gas burner.

According to a further embodiment, the burner housing has a nozzle holder, a lower burner part, which comprises the intermediate element and a mixing chamber element, and a burner cover placed on the lower burner part.

The nozzle holder, the intermediate element, the mixing chamber element and the burner cover are preferably each made of a magnesium alloy or an aluminum alloy. In particular, the individual parts of the Be burner housing die-cast components. As a result, the gas burner can be manufactured inexpensively in large numbers. The gas nozzles are accommodated in the nozzle holder. The gas nozzles can be positioned in the nozzle holder at the same height or at different heights with respect to the direction of gravity. The lower burner part is at least partially received in the nozzle holder. The nozzle holder is in particular positioned under a cover plate of the domestic cooking appliance. The lower burner part and the burner cover are arranged in particular above the cover plate. In particular, the cover plate can be clamped between the lower burner part and the nozzle holder.

According to a further embodiment, the first mixing chamber is at least partially and the second mixing chamber is arranged completely in the mixing chamber element.

In particular, the first mixing chamber is formed both in the intermediate element and in the mixing chamber element. That is, the first mixing chamber extends from the mixing chamber element into the intermediate element. The second mixing chamber is arranged eccentrically with respect to the central axis of the gas burner. In particular, the second mixing chamber is positioned next to the first mixing chamber.

According to a further embodiment, the first mixture distribution chamber is provided between the intermediate element and the burner cover, and / or the second mixture distribution chamber is provided between the mixing chamber element and the intermediate element.

That is, the intermediate element spatially separates the first mixture distribution chamber from the second mixture distribution chamber.

According to a further embodiment, the mixture outlet openings are provided on the burner cover.

The burner cover has a preferably circular and plate-shaped base section from which a support section extends on the underside. The support section rests on the lower part of the burner. The mixture outlet openings are provided on the support section. The mixture outlet openings can be designed as grooves, slots, openings or bores. Preferably they are Mixture outlet openings designed as slots. As a result, the burner cover can be manufactured particularly easily.

According to a further embodiment, the gas burner comprises a plurality of connection channels.

In particular, the number of connecting channels corresponds to the number of mixture outlet openings. A mixture outlet opening is preferably assigned to each connecting channel.

Furthermore, a domestic cooking appliance, in particular a gas stove, with such a gas burner is proposed.

The domestic cooking appliance preferably has a large number of such gas burners. A gas control valve or gas control valve can be assigned to each gas burner. The gas control valve can be set up to regulate a fuel gas volume flow to the first gas nozzle and / or to the second gas nozzle in a stepless or stepped manner. Depending on the position of a control knob of the gas control valve, fuel gas can be fed to either only the first gas nozzle, only the second gas nozzle or both gas nozzles at the same time. The gas control valve can also be a so-called step valve. The household cooking appliance also has a common cover plate on which all gas burners are mounted. The cover plate can, for example, be a sheet steel or a glass ceramic plate. The household appliance can be a stand-alone appliance or a built-in appliance. The household appliance is preferably a household gas stove. For example, the household cooking appliance can have four such gas burners. The gas control valve is clamped to a main gas line of the domestic cooking appliance and is fluidically connected to the gas burner assigned to it via two gas supply lines, namely one for the first gas nozzle and one for the second gas nozzle. Furthermore, an ignition device, which can be integrated into the gas control valve, and an ignition element arranged directly on the gas burner, for example a spark plug, can be assigned to each gas burner. Furthermore, each gas burner can have a thermocouple for flame monitoring. The thermocouple is electrically connected to the gas control valve of the respective gas burner.

Further possible implementations of the gas burner and / or the domestic cooking appliance also include combinations of features or features that are not explicitly mentioned above or below with regard to the exemplary embodiments Embodiments. The person skilled in the art will also add individual aspects as improvements or additions to the respective basic shape of the gas burner and / or the domestic cooking appliance.

• Fig. 1 zeigt eine schematische Ansicht einer Ausführungsform eines Haushaltsgeräts;
• Fig. 2 zeigt eine schematische perspektivische Ansicht einer Ausführungsform eines Gasbrenners für das Haushaltsgargerät gemäß Fig. 1;
• Fig. 3 zeigt eine schematische perspektivische Explosionsansicht des Gasbrenners gemäß Fig. 2;
• Fig. 4 zeigt eine schematische geschnittene Explosionsansicht des Gasbrenners gemäß Fig. 2;
• Fig. 5 zeigt eine schematische Schnittansicht des Gasbrenners gemäß Fig. 2;
• Fig. 6 zeigt eine schematische Schnittansicht einer weiteren Ausführungsform eines Gasbrenners für das Haushaltsgargerät gemäß Fig. 1;
• Fig. 7 zeigt eine weitere schematische Schnittansicht des Gasbrenners gemäß Fig. 6;
• Fig. 8 zeigt eine weitere schematische Schnittansicht des Gasbrenners gemäß Fig. 6; und
• Fig. 9 zeigt eine weitere schematische Schnittansicht des Gasbrenners gemäß Fig. 6.

Further advantageous configurations and aspects of the gas burner and / or the domestic cooking appliance are the subject of the subclaims and the exemplary embodiments of the gas burner and / or the domestic cooking appliance described below. In the following, the gas burner and / or the domestic cooking appliance are explained in more detail on the basis of preferred embodiments with reference to the attached figures.

• Fig. 1 shows a schematic view of an embodiment of a household appliance;
• Fig. 2 shows a schematic perspective view of an embodiment of a gas burner for the domestic cooking appliance according to FIG Fig. 1 ;
• Fig. 3 shows a schematic perspective exploded view of the gas burner according to FIG Fig. 2 ;
• Fig. 4 shows a schematic sectional exploded view of the gas burner according to FIG Fig. 2 ;
• Fig. 5 shows a schematic sectional view of the gas burner according to FIG Fig. 2 ;
• Fig. 6 shows a schematic sectional view of a further embodiment of a gas burner for the domestic cooking appliance according to FIG Fig. 1 ;
• Fig. 7 shows a further schematic sectional view of the gas burner according to FIG Fig. 6 ;
• Fig. 8 shows a further schematic sectional view of the gas burner according to FIG Fig. 6 ; and
• Fig. 9 shows a further schematic sectional view of the gas burner according to FIG Fig. 6 .

In the figures, elements that are the same or have the same function have been provided with the same reference symbols, unless otherwise stated.

The Fig. 1 shows a schematic view of an embodiment of a domestic cooking appliance 1. The domestic cooking appliance 1 is in particular a gas stove or domestic gas stove. The household cooking appliance 1 can be a built-in appliance or a floor-standing appliance. The household cooking appliance 1 comprises several gas burners 2. The gas burners 2 can also be referred to as household appliance gas burners. The number of gas burners 2 is arbitrary. For example, four gas burners 2 can be provided. The gas burners 2 are arranged on a common hob plate 3. For example, the gas burners 2 can be attached to the hob plate 3. The gas burners 2 can each have a ring-shaped, circumferential heat protection, which is designed to protect the hob plate 3 from the introduction of heat by the waste heat from the gas burners 2.

The hob plate 3 can for example be a sheet steel or a glass ceramic plate. Each gas burner 2 is assigned a gas regulating valve or gas control valve 4, with the aid of which a fuel gas flow supplied to the respective gas burner 2 can optionally be switched on, switched off and, in particular, continuously adjusted. Alternatively, the gas control valves 4 can also be set up to regulate the fuel gas flow supplied to the respective gas burner 2 in a stepped manner. That is, the gas control valves 4 can be designed as stepped gas control valves or as so-called step valves.

The Fig. 2 FIG. 11 shows a schematic perspective view of an embodiment of a gas burner 2 for the domestic cooking appliance 1 according to FIG Fig. 1 . The Fig. 3 shows a schematic perspective exploded view of the gas burner 2. FIG Fig. 4 shows a schematic sectional exploded view of the gas burner 2 and FIG Fig. 5 shows a schematic sectional view of the gas burner 2. In the following, reference is made to FIG Figs. 2 to 5 simultaneously referred to.

The gas burner 2 comprises a burner housing 5 which is in several parts. The burner housing 5 can be made of an aluminum alloy or a magnesium alloy, for example. The burner housing 5 is preferably formed from die-cast components, in particular from aluminum die-cast components or magnesium die-cast components. The burner housing 5 comprises a nozzle holder 6, which is arranged below the hob plate 3. A first gas supply line 7 and a second gas supply line 8 are provided in the nozzle holder 6. The first gas supply line 7 and the second gas supply line 8 are not fluidically connected to one another. With the aid of the first gas supply line 7, one is inserted into the nozzle holder 6 recorded first gas nozzle 9 supplied fuel gas. With the aid of the second gas supply line 8, fuel gas is supplied to a second gas nozzle 10 accommodated in the nozzle holder 6.

The gas supply lines 7, 8 are each fluidically connected to a gas control valve 4 assigned to the gas burner 2 with the aid of a gas line (not shown). The gas control valve 4 is clamped to a main gas line of the domestic cooking appliance 1. With the aid of the gas control valve 4, a fuel gas flow supplied to the respective gas supply line 7, 8 can be adjusted continuously or in steps. The first gas nozzle 9 is received in a first bore 11 which is provided in the nozzle holder 6. The first bore 11 is arranged perpendicular to the first gas feed line 7 and opens into the first gas feed line 7. The first bore 11 can have an internal thread into which an external thread of the first gas nozzle 9 is screwed. That is, the first gas nozzle 9 is screwed into the first bore 11. The second gas nozzle 10 is received in a second bore 12 also provided in the nozzle holder 6. The second bore 12 is arranged perpendicular to the second gas supply line 8 and opens into it. The second bore 12 can have an internal thread into which a corresponding external thread of the second gas nozzle 10 is screwed. That is, the second gas nozzle 10 is screwed into the second bore 12.

The bores 11, 12 can be arranged parallel to a symmetry or central axis M2 of the burner housing 5 or of the gas burner 2. As the Fig. 5 shows, the first gas nozzle 9 is positioned rotationally symmetrically to the central axis M2. The second gas nozzle 10 is off-center, that is, positioned next to the first gas nozzle 9. With regard to a direction of gravity g, the first gas nozzle 9 is positioned below the second gas nozzle 10.

The nozzle holder 6 has openings 13, 14 through which primary air can flow from an area U of the gas burner 2 to the gas nozzles 9, 10. This means that the gas nozzles 9, 10 are not completely surrounded by the nozzle holder 6. The primary air is preferably supplied to the gas nozzles 9, 10 from below the hob plate 3. The nozzle holder 6 further comprises a plate-shaped fastening section 15, which rests on the underside of the hob plate 3. The fastening section 15 can have receiving sections 16, 17, with a thermocouple 18 for flame monitoring in a first receiving section 16 and an ignition element 19 for igniting the in a second receiving section 17 Gas burner 2 is added. A sealing plate 20 can be arranged on the fastening section 15. The sealing plate 20 can be arranged between the fastening section 15 and the hob plate 3.

The burner housing 5 furthermore comprises a lower burner part 21 which is arranged at least partially above the hob plate 3. In particular, the hob plate 3 can be arranged between the lower burner part 21 and the nozzle holder 6 and, in particular, be clamped between them. The burner lower part 21 comprises a mixing chamber element 22 which is constructed essentially rotationally symmetrical to the central axis M2. The mixing chamber element 22 comprises a cylindrical first base section 23 in which a first mixing chamber 24 of the gas burner 2, which is constructed rotationally symmetrical to the central axis M2, is provided. The first mixing chamber 24 is positioned with a lower edge 25 above the first gas nozzle 9 with respect to the direction of gravity g. That is to say, the first gas nozzle 9 is arranged completely outside the first mixing chamber 24. The first gas nozzle 9 is set up to inject fuel gas into the first mixing chamber 24, as a result of which primary air is sucked in past the first gas nozzle 9 into the first mixing chamber 24 and is mixed there with the fuel gas.

The mixing chamber element 22 furthermore comprises a second, likewise cylindrical base section 26, which is arranged eccentrically with respect to the central axis M2 and next to the first base section 23. A second mixing chamber 27 of the gas burner 2 is provided in the second base section 26. The second mixing chamber 27 is arranged completely within the second base section 26. With regard to the direction of gravity g, a lower edge 28 of the second mixing chamber 27 is arranged above the second gas nozzle 10. That is, the second gas nozzle 10 is arranged completely outside the second mixing chamber 27. The second gas nozzle 10 is designed to inject fuel gas into the second mixing chamber 27, with primary air being sucked into the second mixing chamber 27 when the fuel gas is injected into the second mixing chamber 27 past the second gas nozzle 10 and mixed with the fuel gas there.

The mixing chamber element 22 is at least partially received in the nozzle holder 6. The mixing chamber element 22 furthermore has a disc-shaped peripheral edge section 29. Furthermore, the mixing chamber element 22 can have a first receiving section 30 for receiving the thermocouple 18 and a second receiving section 31 for receiving the ignition element 19 exhibit. Furthermore, a stepped bore 32 is provided in the mixing chamber element 22, in which a screw 33, in particular a cylinder screw, is provided for screwing the mixing chamber element 22 to the nozzle holder 6.

The lower burner part 21 further comprises an intermediate element 34. The intermediate element 34 is designed to be rotationally symmetrical to the central axis M2 and has a first lateral recess 35 for the thermocouple 18 and a second lateral recess 36 for the ignition element 19. The intermediate element 34 comprises a cylindrical base section 37 which is rotationally symmetrical to the central axis M2. A part of the first mixing chamber 24 is formed in the base section 37. That is, the first mixing chamber 24 extends from the mixing chamber element 22 into the intermediate element 34. The second mixing chamber 27 does not extend into the intermediate element 34.

An annular edge section 38 is provided around the base section 37 and is interrupted by the recesses 35, 36 lying opposite one another. The base section 37 is connected in one piece to the edge section 38 with the aid of a frustoconical first section 39 and a disk-shaped second section 40. In the edge portion 38 a plurality of connecting channels 41 is provided, of which in the Fig. 3 and 4th only one is provided with a reference number. The connecting channels 41 can also be provided in the second section 40. The connecting channels 41 are openings penetrating the intermediate element 34. For example, the connecting channels 41 can be designed as bores. The number of connection channels 41 is arbitrary. The connection channels 41 are preferably arranged distributed uniformly over a circumference of the intermediate element 34.

Furthermore, the burner housing 5 comprises a burner cover 42. The burner cover 42 is placed on the upper side on the lower burner part 21 and in particular on the intermediate element 34 and can be lifted from it. The burner cover 42 has a disk-shaped base section 43 that is rotationally symmetrical to the central axis M2. An annular circumferential support section 44, which rests on the intermediate element 34, extends out of the base section 43 on the underside. The support section 44 is provided with a plurality of mixture outlet openings 45, of which in the Fig. 4 only one is provided with a reference number. During operation of the gas burner 2, a fuel gas / primary air mixture emerges through the mixture outlet openings 45. Hence can the mixture outlet openings 45 are also referred to as fuel gas / primary air mixture outlet openings, gas mixture outlet openings or gas outlet openings. A “gas mixture” or “mixture” is to be understood in the present case as a combustible mixture of fuel gas and primary air. The number of mixture outlet openings 45 is arbitrary. The mixture outlet openings 45 are preferably arranged in a uniformly distributed manner around a circumference of the support section 44. The mixture outlet openings 45 can be bores, openings or, as in FIG Fig. 4 shown, be formed as slots.

As the Fig. 5 shows, a first mixture distribution chamber 46 is provided between the intermediate element 34 and the burner cover 42, into which the first mixing chamber 24 opens. That is, the first mixing chamber 24 is in direct fluid communication with the first mixture distribution chamber 46. The first mixture distribution chamber 46 is designed to distribute the fuel gas / primary air mixture generated in the first mixing chamber 24 evenly to the mixture outlet openings 45. The first mixture distribution chamber 46 can also be set up to further mix the fuel gas / primary air mixture. The first mixture distribution chamber 46 can also be referred to as the first fuel gas / primary air mixture distribution chamber or the first gas mixture distribution chamber. The first mixture distribution chamber 46 runs in a ring around the first mixing chamber 24.

With regard to the direction of gravity g below the first mixture distribution chamber 46, a second mixture distribution chamber 47 is provided. The second mixture distribution chamber 47 is provided between the intermediate element 34 and the mixing chamber element 22. The second mixing chamber 27 opens into the second mixture distribution chamber 47. That is, the second mixing chamber 27 is in direct fluidic connection with the second mixture distribution chamber 47. The second mixture distribution chamber 47 is designed to distribute the fuel gas / primary air mixture generated in the second mixing chamber 27 evenly to the connecting channels 41. The second mixture distribution chamber 47 can also be set up to further mix the fuel gas / primary air mixture. The second mixture distribution chamber 47 can also be referred to as a second fuel gas / primary air mixture distribution chamber or a second gas mixture distribution chamber.

The first mixture distribution chamber 46 is structurally separated from the second mixture distribution chamber 47 with the aid of the intermediate element 34. The second mixture distribution chamber 47 does not have its own mixture outlet openings 45. The second Mixture distribution chamber 47 is in fluidic connection with the mixture outlet openings 45 of the first mixture distribution chamber 46 via the connection channels 41, so that the fuel gas / primary air mixture formed in the second mixing chamber 27 via the second mixture distribution chamber 47 and the connection channels 41 to the mixture outlet openings 45 assigned to the first mixture distribution chamber 46 can flow and exits from the gas burner 2 to form a flame. A connection channel 41 is preferably assigned to each mixture outlet opening 45.

The Figures 6 to 9 show an alternative embodiment of a gas burner 2 in different sectional views. The functionality of the gas burner 2 according to the Figures 6 to 9 corresponds to the functionality of the gas burner according to Figs. 2 to 5 . Therefore, the functionality of the gas burner 2 is based on Figures 6 to 9 explained, to which reference is made simultaneously below.

The gas burner 2 according to the Figures 6 to 9 differs from the gas burner 2 according to FIGS Figs. 2 to 5 only by an alternative embodiment of the intermediate element 34 and the nozzle holder 6. In this embodiment of the nozzle holder 6, the first gas nozzle 9 and the second gas nozzle 10 are not positioned at different heights with respect to the direction of gravity g, but at the same height. The intermediate element 34 of the gas burner 2 according to FIGS Figures 6 to 9 differs from the intermediate element 34 of the gas burner 2 according to FIGS Figs. 2 to 5 essentially in that this is arranged within the mixing chamber element 22 and that the connecting channels 41 are not designed as bores, but as lateral grooves or slots in the edge section 38 of the intermediate element 34. As a result, the intermediate element 34 can be manufactured more cheaply and more simply.

The Fig. 6 and 7th show the gas burner 2 in a minimal fire mode. The minimum fire operation can also be referred to as simmer operation. In the minimum fire operation, the gas burner 2 can be operated with very little power. In the minimum fire mode, the output of the gas burner 2 can be adjusted with the aid of the gas control valve 4. In the minimum fire mode, the gas burner 2 is only supplied with fuel gas B via the second gas supply line 8. The fuel gas B is injected into the second mixing chamber 27 via the second gas nozzle 10. In this case, primary air L is sucked in from the environment U into the second mixing chamber 27 by a Venturi effect past the second gas nozzle 10 and mixed there with the fuel gas B. The mixing of the fuel gas B with the primary air L can take place in the second Mixing chamber 27 has not yet been fully completed. The at least premixed fuel gas / primary air mixture flows from the second mixing chamber 27 into the second mixture distribution chamber 47, the fuel gas B and the primary air L being able to mix further. This results in a particularly homogeneous mixing of the fuel gas B with the primary air L.

The fuel gas / primary air mixture flows from the second mixture distribution chamber 47 via the connecting channels 41 to the mixture outlet openings 45 of the first mixture distribution chamber 46, the fuel gas / primary air mixture exiting the gas burner 2 and being burned to form a flame. The flow of the fuel gas B and the fuel gas / primary air mixture is in the Fig. 6 and 7th shown with arrows.

The Fig. 8 and 9 show the gas burner 2 in a maximum fire mode. In the maximum fire mode, the output of the gas burner 2 can be adjusted with the aid of the gas control valve 4. The power of the gas burner 2 can be set with just one gas control valve 4 both in minimum fire operation and in maximum fire operation. In the maximum fire mode, fuel gas B is fed to the gas burner 2 both via the first gas supply line 7 and via the second gas supply line 8. As already described above, the fuel gas B is metered into the second mixing chamber 27 with the aid of the second gas nozzle 10 and mixed there with the primary air L drawn in from the side. The fuel gas / primary air mixture flows from the second mixing chamber 27 into the second mixture distribution chamber 47 and there via the connecting channels 41 directly to the mixture outlet openings 45, without flowing into the first mixture distribution chamber 46.

At the same time, the first gas nozzle 9 injects fuel gas B into the first mixing chamber 24, as a result of which primary air L is sucked in past the first gas nozzle 9 into the first mixing chamber 24 and is mixed with the fuel gas B there. From the first mixing chamber 24, the premixed fuel gas / primary air mixture is fed to the first mixture distribution chamber 46 and distributed evenly to the mixture outlet openings 45, the fuel gas / primary air mixture mixed in the first mixing chamber 24 and the fuel gas / primary air mixture mixed in the second mixing chamber 27 simultaneously flow out of the mixture outlet openings 45. In the maximum fire mode, the supply of fuel gas B to the second gas nozzle 10 can also be switched off.

Because the gas burner 2 has two mixing chambers 24, 27, the gas burner 2 can also be operated with very low combustion outputs and at the same time high flame stability. This means that the gas burner 2 works very efficiently and does not go out even in minimal fire operation. For example, the gas burner 2 can be operated in the previously mentioned simmer mode. Because only one common row of mixture outlet openings 45 is provided for both mixture distribution chambers 46, 47, a simpler and more aesthetic design of the gas burner 2 can be achieved compared to gas burners with two rows of such mixture outlet openings. The row of mixture outlet openings 45 can be referred to as a burner ring. Furthermore, the number of parts required is reduced compared to known gas burners. The gas burner 2 is also very easy to clean. The costs for producing the gas burner 2 and for operating the gas burner 2 with very low fire outputs can be significantly reduced in comparison with known gas burners.

Reference symbols used:

1

Domestic cooking appliance

2

Gas burner

3

Hob plate

4th

Gas control valve

5

Burner housing

6th

Nozzle holder

7th

Gas supply line

8th

Gas supply line

9

Gas nozzle

10

Gas nozzle

11

drilling

12

drilling

13

breakthrough

14th

breakthrough

15th

Fastening section

16

Receiving section

17th

Receiving section

18th

Thermocouple

19th

Ignition element

20th

Sealing plate

21st

Burner base

22nd

Mixing chamber element

23

Base section

24

Mixing chamber

25th

edge

26th

Base section

27

Mixing chamber

28

edge

29

Edge section

30th

Receiving section

31

Receiving section

32

drilling

33

screw

34

Intermediate element

35

Recess

36

Recess

37

Base section

38

Edge section

39

section

40

section

41

Connection channel

42

Burner cover

43

Base section

44

Support section

45

Mixture outlet opening

46

Mixture distribution chamber

47

Mixture distribution chamber

B.

Fuel gas

G

Direction of gravity

L.

Primary air

M2

Central axis

U

Surroundings

Claims (15)

1. Gas burner (2) for a household cooking appliance (1), with a first mixture-distribution chamber (46) having a plurality of mixture-outlet openings (45) and a second mixture-distribution chamber (47) that is separate from the first mixture-distribution chamber (46), wherein the second mixture-distribution chamber (47) is fluidically connected to the mixture-outlet openings (45) of the first mixture-distribution chamber (46) such that, when the gas burner (2) is in operation, both a combustion-gas/primary-air mixture from the first mixture-distribution chamber (46) and a combustion-gas/primary-air mixture from the second mixture-distribution chamber (47) can be conducted, with the aid of the mixture-outlet openings (45), out of the gas burner (2) for the purpose of flame formation.
2. Gas burner according to claim 1, characterised in that that at least one connecting channel (41) is provided, which fluidically connects the second mixture-distribution chamber (47) to the mixture-outlet openings (45) of the first mixture-distribution chamber (46).
3. Gas burner according to claim 1 or 2, characterised in that the first mixture-distribution chamber (46) is arranged above the second mixture-distribution chamber (47) with respect to a direction of gravity (g).
4. Gas burner according to claim 2 or 3, characterised by a first mixing chamber (24) for mixing combustion gas (B) with primary air (L), wherein the first mixing chamber (24) is in direct fluidic connection with the first mixture-distribution chamber (46) and a second mixing chamber (27) separate from the first mixing chamber (24) for mixing combustion gas (B) with primary air (L), wherein the second mixing chamber (27) is in direct fluidic connection with the second mixture-distribution chamber (47).
5. Gas burner according to claim 4, characterised in that a volume of the first mixing chamber (24) is greater than a volume of the second mixing chamber (27).
6. Gas burner according to claim 4 or 5, characterised by a first gas nozzle (9) for injecting combustion gas (B) into the first mixing chamber (24) and a second gas nozzle (10) for injecting combustion gas (B) into the second mixing chamber (27).
7. Gas burner according to one of claims 2 - 6, characterised by an intermediate element (34), which is part of a burner housing (5) of the gas burner (2) and which separates the first mixture-distribution chamber (46) from the second mixture-distribution chamber (47).
8. Gas burner according to claim 7, characterised in that the at least one connecting channel (41) is a bore provided in the intermediate element (34) or a groove provided on an edge section (38) of the intermediate element (34).
9. Gas burner according to claim 7 or 8, characterised in that the first mixing chamber (24) is at least partially arranged in the intermediate element (34).
10. Gas burner according to one of claims 7 - 9, characterised in that the burner housing (5) has a nozzle holder (6), a burner lower part (21) comprising the intermediate element (34) and a mixing-chamber element (22) and a burner cover (42) placed on the burner lower part (21).
11. Gas burner according to claim 10, characterised in that the first mixing chamber (24) is arranged at least partially in the mixing chamber element (22) and the second mixing chamber (27) is arranged completely therein.
12. Gas burner according to claim 10 or 11, characterised in that the first mixture-distribution chamber (46) is provided between the intermediate element (34) and the burner cover (42) and/or that the second mixture-distribution chamber (47) is provided between the mixing chamber element (22) and the intermediate element (34).
13. Gas burner according to one of claims 10 - 12, characterised in that the mixture-outlet openings (45) are provided on the burner cover (42).
14. Gas burner according to one of claims 2 - 13, characterised by a plurality of connecting channels (41).
15. Household cooking appliance (1), in particular a gas stove, with a gas burner (2) according to one of claims 1 - 14.

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