Gas burner and domestic cooking appliance

Abstract

A gas burner for a household cooking appliance includes a first mixture-distribution chamber having a plurality of mixture-outlet openings, and a second mixture-distribution chamber separate from the first mixture-distribution chamber. The second mixture-distribution chamber is fluidically connected to the mixture-outlet openings of the first mixture-distribution chamber such that, when the gas burner is in operation, a combustion-gas/primary-air mixture is conducted out from the first mixture-distribution chamber and a combustion-gas/primary-air mixture is conducted out from the second mixture-distribution chamber via the mixture-outlet openings for flame formation.

Claims

1. A gas burner for a household cooking appliance, said gas burner comprising: a first mixture-distribution chamber having a plurality of mixture-outlet openings; a second mixture-distribution chamber separate from the first mixture-distribution chamber, said second mixture-distribution chamber being fluidically connected to the mixture-outlet openings of the first mixture-distribution chamber such that, when the gas burner is in operation, a combustion-gas/primary-air mixture is conducted out from the first mixture-distribution chamber and a combustion-gas/primary-air mixture is conducted out from the second mixture-distribution chamber via the mixture-outlet openings for flame formation, and a connecting channel fluidically connecting the second mixture-distribution chamber to the mixture outlet openings of the first mixture-distribution chamber.

2. The gas burner of claim 1, wherein the first mixture-distribution chamber is arranged above the second mixture-distribution chamber with respect to a direction of gravity.

3. The gas burner of claim 1, further comprising: a first mixing chamber for mixing combustion gas with primary air, said first mixing chamber being in direct fluidic connection with the first mixture-distribution chamber; and a second mixing chamber separate from the first mixing chamber for mixing combustion gas with primary air, said second mixing chamber being in direct fluidic connection with the second mixture-distribution chamber.

4. The gas burner of claim 3, wherein the first mixing chamber has a volume which is greater than a volume of the second mixing chamber.

5. The gas burner of claim 3, further comprising: a first gas nozzle for injecting combustion gas into the first mixing chamber, and a second gas nozzle for injecting combustion gas into the second mixing chamber.

6. The gas burner of claim 1, further comprising a burner housing, and an intermediate element, which is part of the burner housing and which separates the first mixture-distribution chamber from the second mixture-distribution chamber.

7. The gas burner of claim 6, wherein the connecting channel is embodied as a bore in the intermediate element or as a groove on an edge section of the intermediate element.

8. The gas burner of claim 3, further comprising a burner housing and an intermediate element, which is part of the burner housing and which separates the first mixture-distribution chamber from the second mixture-distribution chamber, said first mixing chamber being at least partially arranged in the intermediate element.

9. The gas burner of claim 8, wherein the burner housing has a nozzle holder, a burner lower part comprising the intermediate element and a mixing chamber element, and a burner cover placed on the burner lower part.

10. The gas burner of claim 9, wherein the first mixing chamber is arranged at least partially in the mixing chamber element and the second mixing chamber is arranged completely in the mixing chamber element.

11. The gas burner of claim 9, wherein 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.

12. The gas burner of claim 9, wherein the mixture-outlet openings are provided on the burner cover.

13. The gas burner of claim 1, further comprising a plurality of said connecting channel.

14. A household cooking appliance, comprising a gas burner said gas burner comprising a first mixture-distribution chamber having a plurality of mixture-outlet openings, and a second mixture-distribution chamber separate from the first mixture-distribution chamber, said second mixture-distribution chamber being fluidically connected to the mixture-outlet openings of the first mixture-distribution chamber via a connecting channel fluidically connecting the second mixture-distribution chamber to the mixture-outlet openings of the first mixture-distribution chamber such that, when the gas burner is in operation, a combustion-gas/primary-air mixture is conducted out from the first mixture-distribution chamber and a combustion-gas/primary-air mixture is conducted out from the second mixture-distribution chamber via the mixture-outlet openings for flame formation.

15. The household cooking appliance of claim 14, constructed in the form of a gas stove.

16. The household cooking appliance of claim 14, wherein the first mixture-distribution chamber is arranged above the second mixture-distribution chamber with respect to a direction of gravity.

17. The household cooking appliance of claim 14, wherein the gas burner includes a first mixing chamber for mixing combustion gas with primary air, said first mixing chamber being in direct fluidic connection with the first mixture-distribution chamber, and a second mixing chamber separate from the first mixing chamber for mixing combustion gas with primary air, said second mixing chamber being in direct fluidic connection with the second mixture-distribution chamber.

18. The household cooking appliance of claim 17, wherein the first mixing chamber has a volume which is greater than a volume of the second mixing chamber.

19. The household cooking appliance of claim 17, wherein the gas burner includes a first gas nozzle for injecting combustion gas into the first mixing chamber, and a second gas nozzle for injecting combustion gas into the second mixing chamber.

20. The household cooking appliance of claim 14, wherein the gas burner includes a burner housing and an intermediate element, which is part of the burner housing and which separates the first mixture-distribution chamber from the second mixture-distribution chamber.

21. The household cooking appliance of claim 6, wherein the connecting channel is embodied as a bore in the intermediate element or as a groove on an edge section of the intermediate element.

22. The household cooking appliance of claim 17, wherein the gas burner includes a burner housing, and an intermediate element, which is part of the burner housing and which separates the first mixture-distribution chamber from the second mixture-distribution chamber, said first mixing chamber being at least partially arranged in the intermediate element.

23. The household cooking appliance of claim 22, wherein the burner housing has a nozzle holder, a burner lower part comprising the intermediate element and a mixing chamber element, and a burner cover placed on the burner lower part.

24. The household cooking appliance of claim 23, wherein the first mixing chamber is arranged at least partially in the mixing chamber element and the second mixing chamber is arranged completely in the mixing chamber element.

25. The household cooking appliance of claim 23, wherein 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.

26. The household cooking appliance of claim 23, wherein the mixture-outlet openings are provided on the burner cover.

27. The household cooking appliance of claim 14, wherein the gas burner includes a plurality of said connecting channel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantageous embodiments and aspects of the gas burner and/or the household cooking appliance are the subject matter of the subclaims and the exemplary embodiments of the gas burner and/or the household cooking appliance described below. The gas burner and/or the household cooking appliance will now be described in more detail with reference to preferred embodiments and with reference to the attached figures.

(2) FIG. 1 shows a schematic view of an embodiment of a household appliance;

(3) FIG. 2 shows a schematic perspective view of an embodiment of a gas burner for the household cooking appliance in FIG. 1;

(4) FIG. 3 shows a schematic exploded perspective view of the gas burner in FIG. 2;

(5) FIG. 4 shows a schematic sectional exploded view of the gas burner in FIG. 2;

(6) FIG. 5 shows a schematic sectional view of the gas burner in FIG. 2;

(7) FIG. 6 shows a schematic sectional view of a further embodiment of a gas burner for the household cooking appliance in FIG. 1;

(8) FIG. 7 shows a further schematic sectional view of the gas burner in FIG. 6;

(9) FIG. 8 shows a further schematic sectional view of the gas burner in FIG. 6; and

(10) FIG. 9 shows a further schematic sectional view of the gas burner in FIG. 6.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS OF THE PRESENT INVENTION

(11) In the figures, the same reference characters denote elements that are the same or have similar functions, unless specified otherwise.

(12) FIG. 1 shows a schematic view of an embodiment of a household cooking appliance 1. The household cooking appliance 1 is in particular a gas stove or household gas stove. The household cooking appliance 1 can be a built-in appliance or a standalone appliance. The household cooking appliance 1 comprises a plurality of gas burners 2. The gas burners 2 can also be referred to as household-appliance gas burners. The number of gas burners 2 is optional. For example, four gas burners 2 can be provided. The gas burners 2 are arranged on a common cooktop plate 3. For example, the gas burners 2 can be attached to the cooktop plate 3. The gas burners 2 can each have an annular circumferential heat protection, which is configured to protect the cooktop plate 3 from heat input from the waste heat from the gas burners 2.

(13) The cooktop plate 3 can for example be a steel sheet or a glass-ceramic plate. Each gas burner 2 is assigned a gas-regulator valve or gas-control valve 4 which can be used to switch on, switch off and, in particular steplessly, adjust the combustion-gas flow supplied to the respective gas burner 2 as desired. Alternatively, the gas-control valves 4 can also be configured to regulate the combustion-gas flow supplied to the respective gas burner 2 in a stepped manner. This means that the gas-control valves 4 can be embodied as stepped gas-control valves or so-called step valves.

(14) FIG. 2 shows a schematic perspective view of an embodiment of a gas burner 2 for the household cooking appliance 1 as shown in FIG. 1. FIG. 3 shows a schematic exploded perspective view of the gas burner 2. FIG. 4 shows a schematic sectional exploded view of the gas burner 2 and FIG. 5 shows a schematic sectional view of the gas burner 2. The following refers to FIGS. 2 to 5 simultaneously.

(15) The gas burner 2 comprises a multipart burner housing 5. The burner housing 5 can for example be made of an aluminum alloy or a magnesium alloy. The burner housing 5 is preferably made of die-cast components, in particular aluminum die-cast components or magnesium die-cast components. The burner housing 5 comprises a nozzle holder 6, which is arranged below the cooktop 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. The first gas-supply line 7 is used to supply combustion gas to a first gas nozzle 9 accommodated in the nozzle holder 6. The second gas-supply line 8 is used to supply a combustion gas to a second gas nozzle 10 accommodated in the nozzle holder 6.

(16) The gas-supply lines 7, 8 are each fluidically connected by means of a gas line, not shown, to a gas-control valve 4 assigned to the gas burner 2. The gas-control valve 4 is clipped onto a main gas line of the household cooking appliance 1. The gas-control valve 4 can be used to adjust a combustion-gas flow supplied to the respective gas-supply line 7, 8 in a stepless or stepped manner. The first gas nozzle 9 is accommodated in a first bore 11 provided in the nozzle holder 6. The first bore 11 is arranged perpendicular to the first gas-supply line 7 and opens into the first gas-supply line 7. The first bore 11 can have an internal thread into which an external thread of the first gas nozzle 9 is screwed. This means that the first gas nozzle 9 is screwed into the first bore 11. The second gas nozzle 10 is accommodated in a second bore 12 which is also provided in the nozzle holder 6. The second bore 12 is arranged perpendicular to the second gas-supply line 8 and opens thereinto. The second bore 12 can have an internal thread into which a corresponding external thread of the second gas nozzle 10 is screwed. This means that the second gas nozzle 10 is screwed into the second bore 12.

(17) Herein, the bores 11, 12 can be arranged parallel to an axis of symmetry or central axis M2 of the burner housing 5 or the gas burner 2 arranged. As FIG. 5 shows, the first gas nozzle 9 is positioned rotationally symmetrically to the central axis M2. The second gas nozzle 10 is positioned off-center, i.e. next to the first gas nozzle 9. The first gas nozzle 9 is positioned below the second gas nozzle 10 with respect to a direction of gravity g.

(18) The nozzle holder 6 has apertures 13, 14 through which the primary air can flow from an environment 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. Herein, the primary air is supplied to the gas nozzles 9, 10 from below the cooktop plate 3. The nozzle holder 6 furthermore comprises a plate-shaped attachment section 15, which rests on the underside of the cooktop plate 3. The attachment section 15 can have accommodating sections 16, 17, wherein a first accommodating section 16 accommodates a thermoelement 18 for flame monitoring and a second accommodating section 17 accommodates an ignition element 19 for igniting the gas burner 2. A sealing plate 20 can be arranged on the attachment section 15. The sealing plate 20 can be arranged between the attachment section 15 and the cooktop plate.

(19) The burner housing 5 furthermore comprises a burner lower part 21, which is arranged at least partially above the cooktop plate 3. The cooktop plate 3 in particular can be arranged between the burner lower part 21 and the nozzle holder 6 and in particular firmly clamped between them. The burner lower part 21 comprises a mixing chamber element 22, which is substantially assembled rotationally symmetrically 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 is assembled rotationally symmetrically 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. This means that the first gas nozzle 9 is arranged completely outside the first mixing chamber 24. The first gas nozzle 9 is configured to inject combustion gas into the first mixing chamber 24 thus causing primary air to be drawn past the side of the first gas nozzle 9 into the first mixing chamber 24 where it is mixed with the combustion gas.

(20) The mixing chamber element 22 furthermore comprises a second similarly cylindrical base section 26, which is arranged off-center 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. A lower edge 28 of the second mixing chamber 27 is arranged above the second gas nozzle 10 with respect to the direction of gravity g. This means that the second gas nozzle 10 is arranged completely outside the second mixing chamber 27. The second gas nozzle 10 is configured to inject combustion gas into the second mixing chamber 27, wherein, on the injection of the combustion gas into the second mixing chamber 27, primary air is drawn past the second gas nozzle 10 into the second mixing chamber 27 where it is mixed with the combustion gas.

(21) The mixing chamber element 22 is at least partially accommodated in the nozzle holder 6. The mixing chamber element 22 furthermore has a disk-shaped circumferential edge section 29. Furthermore, the mixing chamber element 22 can have a first accommodating section 30 to accommodate the thermoelement 18 and a second accommodating section 31 to accommodate the ignition element 19. Furthermore, a stepped bore 32, in which a screw 33, in particular a cheese head screw, is provided for screwing the mixing chamber element 22 to the nozzle holder 6, is provided in the mixing chamber element 22.

(22) The burner lower part 21 furthermore comprises an intermediate element 34. The intermediate element 34 is embodied rotationally symmetrically to the central axis M2 and has a first lateral recess 35 for the thermoelement 18 and a second lateral recess 36 for the ignition element 19. The intermediate element 34 comprises a cylindrical base section 37 embodied rotationally symmetrically to the central axis M2. A part of the first mixing chamber 24 is embodied in the base section 37. This means that 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.

(23) Around the circumference of the base section 37, an annular edge section 38 is provided which is interrupted by the opposing recesses 35, 36. The base section 37 is connected to the edge section 38 in one piece by means of a frustoconical first section 39 and a disk-shaped second section 40. The edge section 38 is provided with a plurality of connecting channels 41 which are only indicated by a reference numeral in FIGS. 3 and 4. The connecting channels 41 can also be provided in the second section 40. The connecting channels 41 are the apertures that breach the intermediate element 34. For example, the connecting channels 41 can be embodied as bores. The number of connecting channels 41 is optional. The connecting channels 41 are preferably arranged uniformly distributed over a circumference of the intermediate element 34.

(24) The burner housing 5 furthermore comprises a burner cover 42. The burner cover 42 is placed on top of the burner lower part 21 and in particular on the intermediate element 34 and can be lifted off this. The burner cover 42 has a base section 43 which is embodied as disk-shaped and rotationally symmetrically to the central axis M2. An annular circumferential bearing section 44 extends from the underside of the base section 43 and lies on the intermediate element 34. The bearing section 44 is provided with a plurality of mixture-outlet openings 45 only one of which is given a reference numeral in FIG. 4. When the gas burner 2 is in operation, a combustion-gas/primary-air mixture exits the mixture-outlet openings 45. Therefore, the mixture-outlet openings 45 combustion gas/primary air mixture-outlet openings can also be referred to as gas-mixture-outlet openings or gas-outlet openings. In the present case, a “gas mixture” or “mixture” should be understood to mean a combustible mixture of combustion gas and primary air. The number of mixture-outlet openings 45 is optional. The mixture-outlet openings 45 are preferably uniformly distributed about a circumference of the bearing section 44. The mixture-outlet openings 45 can be embodied as bores, apertures or, as shown in FIG. 4, as slots.

(25) As FIG. 5 shows, a first mixture-distribution chamber 46 into which the first mixing chamber 24 opens is provided between the intermediate element 34 and the burner cover 42. This means that the first mixing chamber 24 is in direct fluidic connection with the first mixture-distribution chamber 46. The first mixture-distribution chamber 46 is configured to distribute the combustion-gas/primary-air mixture generated in the first mixing chamber 24 uniformly between the mixture-outlet openings 45. The first mixture-distribution chamber 46 can also be configured to mix the combustion gas/primary air mixture further. The first mixture-distribution chamber 46 can also be referred to as a first combustion-gas/primary-air-mixture-distribution chamber or first-gas-mixture-distribution chamber. The first mixture-distribution chamber 46 surrounds the first mixing chamber 24.

(26) A second mixture-distribution chamber 47 is provided below the first mixture-distribution chamber 46 is with respect to the direction of gravity g. 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. This means that the second mixing chamber 27 is in direct fluidic connection with the second mixture-distribution chamber 47. The second mixture-distribution chamber 47 is configured to distribute the combustion-gas/primary-air mixture generated in the second mixing chamber 27 uniformly between the connecting channels 41. The second mixture-distribution chamber 47 can also be configured to mix the combustion-gas/primary-air mixture further. The second mixture-distribution chamber 47 can also be referred to as a second combustion-gas/primary-air-mixture-distribution chamber or second gas-mixture-distribution chamber.

(27) The first mixture-distribution chamber 46 is structurally separate from the second mixture-distribution chamber 47 by means 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 connecting channels 41 such that the combustion-gas/primary-air mixture formed in the second mixing chamber 27 can flow via the second mixture-distribution chamber 47 and the connecting channels 41 to the mixture-outlet openings 45 assigned to the first mixture-distribution chamber 46 where it exits the gas burner 2 for the purpose of flame formation. Preferably, a connecting channel 41 is assigned to each mixture-outlet opening 45.

(28) FIGS. 6 to 9 show an alternative embodiment of a gas burner 2 in different sectional views. The functionality of the gas burner 2 in FIGS. 6 to 9 corresponds to the functionality of the gas burner in FIGS. 2 to 5. Therefore, the functionality of the gas burner 2 is explained with reference to FIGS. 6 to 9 which are referred to simultaneously in the following.

(29) The gas burner 2 in FIGS. 6 to 9 only differs from the gas burner 2 in FIGS. 2 to 5 in an alternative embodiment of the intermediate element 34 and of the nozzle holder 6. With this embodiment of the nozzle holder 6, the first gas nozzle 9 and the second gas nozzle 10 are positioned, not at different heights, but at the same height with respect to the direction of gravity g. The intermediate element 34 of the gas burner 2 in FIGS. 6 to 9 substantially differs from the intermediate element 34 of the gas burner 2 in FIGS. 2 to 5 in that this is arranged inside the mixing chamber element 22 and that the connecting channels 41 are embodied not 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 is less expensive and simpler to produce.

(30) FIGS. 6 and 7 show the gas burner 2 in a minimum-flame mode. Minimum-flame mode can also be referred to as simmer mode. In minimum-flame mode, the gas burner 2 can be operated at very low power. In minimum-flame mode, the power of the gas burner 2 can be adjusted by means of the gas-control valve 4. In minimum-flame mode, combustion gas B is only supplied to the gas burner 2 via the second gas-supply line 8. The combustion gas B is injected into the second mixing chamber 27 via the second gas nozzle 10. Herein, a Venturi effect causes primary air L to be drawn in from the environment U past the second gas nozzle 10 into the second mixing chamber 27 where it is mixed with the combustion gas B. The mixing of the combustion gas B with the primary air L may not yet be fully completed in the second mixing chamber 27. The at least premixed combustion-gas/primary-air mixture flows from the second mixing chamber 27 into the second mixture-distribution chamber 47, wherein the combustion gas B and the primary air L can be mixed further. This results in particularly homogeneous mixing of the combustion gas B with the primary air L.

(31) The combustion-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, wherein the combustion-gas/primary-air mixture exits the gas burner 2 exits and is combusted for the purpose of flame formation. The flow paths of the combustion gas B and the combustion-gas/primary-air mixture are depicted by arrows in FIGS. 6 and 7.

(32) FIGS. 8 and 9 show the gas burner 2 in maximum-flame mode. In maximum-flame mode, the power of the gas burner 2 can be adjusted by means of the gas-control valve 4. In both minimum-flame mode and maximum-flame mode, the power of the gas burner 2 can be adjusted with only one gas-control valve 4. In maximum-flame mode, combustion gas B is supplied to the gas burner 2 via both the first gas-supply line 7 and the second gas-supply line 8. As described above, the combustion gas B is injected into the second mixing chamber 27 by the second gas nozzle 10 where it is mixed with the primary air L drawn in at the side. The combustion-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.

(33) The first gas nozzle 9 simultaneously injects combustion gas B into the first mixing chamber 24 and as a result primary air L is drawn in at the side past the first gas nozzle 9 into the first mixing chamber 24 where it is mixed with the combustion gas B. The premixed combustion-gas/primary-air mixture is supplied from the first mixing chamber 24 to the first mixture-distribution chamber 46 and uniformly distributed between the mixture-outlet openings 45, wherein the combustion-gas/primary-air mixture mixed in the first mixing chamber 24 and the combustion-gas/primary-air mixture mixed in the second mixing chamber 27 flow out of the mixture-outlet openings 45 simultaneously. In maximum-flame mode, it is also possible to switch off the supply of combustion gas B to the second gas nozzle 10.

(34) The fact that the gas burner 2 has two mixing chambers 24, 27 also enables the gas burner 2 to be operated at a very low burning power together with high flame stability. This means that, even in minimum-flame mode, the gas burner 2 operates efficiently and does not go out. For example, the gas burner 2 can be operated in the aforementioned simmer mode. The fact that only one common row of mixture-outlet openings 45 is provided that for both mixture-distribution chambers 46, 47 means that 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, fewer parts are required compared to known gas burners. The gas burner is also very simple to clean. The costs of producing the gas burner 2 and during operation of the gas burner 2 at very lower burning power can be significantly reduced compared to known gas burners.