GAS BURNER ARRANGEMENT AND HOUSEHOLD COOKING APPLIANCE

Abstract

A gas burner arrangement for a household cooking appliance includes a hob plate and a gas burner mounted on the hob plate. The gas burner includes a first mixing chamber for mixing combustion gas with primary air, a second mixing chamber, separate from the first mixing chamber, for mixing combustion gas with primary air, at least one first primary air opening for supplying primary air to the first mixing chamber, and at least one second primary air opening for supplying primary air to the second mixing chamber. The at least one first primary air opening is arranged below the hob plate and the at least one second primary air opening is arranged above the hob plate.

Claims

1. A gas burner arrangement (11) for a household cooking appliance (1), having a gas burner (2) and a hob plate (3) on which the gas burner (2) is mounted, wherein the gas burner (2) includes a first mixing chamber (39) for mixing combustion gas (B) with primary air (P), a second mixing chamber (42), separate from the first mixing chamber (39), for mixing combustion gas (B) with primary air (P), at least one first primary air opening (27, 28) for supplying primary air (P) to the first mixing chamber (39), and at least one second primary air opening (45) for supplying primary air (P) to the second mixing chamber (42), wherein the at least one first primary air opening (27, 28) is arranged below the hob plate (3) and the at least one second primary air opening (45) is arranged above the hob plate (3).

2. The gas burner arrangement as claimed in claim 1, characterized in that the first mixing chamber (39) and the second mixing chamber (42) extend through the hob plate (3).

3. The gas burner arrangement as claimed in claim 1 or 2, characterized in that the gas burner (2) includes a nozzle holder (6) and a burner base (7), wherein the hob plate (3) is arranged between the nozzle holder (6) and the burner base (7).

4. The gas burner arrangement as claimed in claim 3, characterized in that the first mixing chamber (39) and the second mixing chamber (42) are provided in the burner base (7).

5. The gas burner arrangement as claimed in claim 3 or 4, characterized in that a first gas nozzle (23) for injecting the combustion gas (B) into the first mixing chamber (39), and a second gas nozzle (31) for injecting the combustion gas (B) into the second mixing chamber (42) are received in the nozzle holder (6).

6. The gas burner arrangement as claimed in claim 5, characterized in that the first gas nozzle (23) is arranged at a spacing from an inflow edge (41) of the first mixing chamber (39), and the second gas nozzle (31) is arranged at a spacing from an inflow edge (44) of the second mixing chamber (42).

7. The gas burner arrangement as claimed in claim 6 or 7, characterized in that the nozzle holder (6) includes a pot-shaped nozzle receiving portion (30) in which the second gas nozzle (31) is received.

8. The gas burner arrangement as claimed in claim 7, characterized in that the second mixing chamber (42) is at least in certain regions received in the nozzle receiving portion (30).

9. The gas burner arrangement as claimed in one of claims 2-8, characterized in that the at least one first primary air opening (27, 28) is guided through the nozzle holder (6).

10. The gas burner arrangement as claimed in one of claims 2-9, characterized in that the at least one second primary air opening (45) is guided through the burner base (7).

11. The gas burner arrangement as claimed in one of claims 2-10, characterized in that the gas burner (2) includes a first mixture distribution chamber (53) that is in fluidic connection with the first mixing chamber (39), and a second mixture distribution chamber (54), separate from the first mixture distribution chamber (53), that is in fluidic connection with the second mixing chamber (42).

12. The gas burner arrangement as claimed in claim 11, characterized in that the gas burner (2) includes a burner lid (9) and an intermediate element (8) that is arranged between the burner lid (9) and the burner base (7).

13. The gas burner arrangement as claimed in claim 12, characterized in that the first mixture distribution chamber (53) is arranged between the burner lid (9) and the intermediate element (8), and the second mixture distribution chamber (54) is arranged between the intermediate element (8) and the burner base (7).

14. The gas burner arrangement as claimed in claim 12 or 13, characterized in that the intermediate element (8) includes a plurality of first mixture outlet openings (49) that are associated with the first mixture distribution chamber (53), and a plurality of second mixture outlet openings (51) that are associated with the second mixture distribution chamber (54).

15. A household cooking appliance (1), in particular a gas cooker, having a gas burner arrangement (11) as claimed in one of claims 1-14.

Description

[0038] Further advantageous configurations and aspects of the gas burner arrangement and/or the household cooking appliance form the subject-matter of the subclaims, and the exemplary embodiments described below, of the gas burner arrangement and/or the household cooking appliance. Below, the gas burner arrangement and/or the household cooking appliance will be explained in more detail on the basis of preferred embodiments, with reference to the attached figures.

[0039] FIG. 1 shows a schematic view of an embodiment of a household cooking appliance;

[0040] FIG. 2 shows a schematic exploded view of an embodiment of a gas burner for the household cooking appliance according to FIG. 1;

[0041] FIG. 3 shows a schematic sectional view of a gas burner arrangement with a gas burner according to FIG. 1;

[0042] FIG. 4 shows a further schematic sectional view of the gas burner arrangement according to FIG. 3;

[0043] FIG. 5 shows a schematic exploded cross-sectional view of the gas burner arrangement according to FIG. 3;

[0044] FIG. 6 shows a further schematic exploded cross-sectional view of the gas burner arrangement according to FIG. 3;

[0045] FIG. 7 shows a schematic perspective view of an embodiment of a nozzle holder for the gas burner according to FIG. 2; and

[0046] FIG. 8 shows a schematic sectional view of the nozzle holder according to FIG. 7.

[0047] In the figures, like or functionally equivalent elements are provided with the same reference characters unless indicated otherwise.

[0048] 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 cooker or household gas cooker. The household cooking appliance 1 may be a built-in appliance or a free-standing appliance. The household cooking appliance 1 includes a plurality of gas burners 2. The gas burners 2 may also be designated as household appliance gas burners. There may be any desired number of gas burners 2. For example, four gas burners 2 may be provided. The gas burners 2 are arranged on a common hob plate 3. For example, the gas burners 2 may be secured to the hob plate 3. The gas burners 2 may each have a heat shield that runs peripherally around them in a ring and is intended to protect the hob plate 3 from being heated by the dissipation of heat by the gas burners 2.

[0049] The hob plate 3 may be for example a steel sheet, a glass ceramic plate or a plate of tempered glass. Associated with each gas burner 2 is a gas regulating valve or gas control valve 4, with the aid of which a stream of combustion gas that is supplied may be selectively switched on, switched off and, in particular continuously variably, adjusted for each gas burner 2. As an alternative, the gas control valves 4 may also be intended to regulate in steps the stream of combustion gas supplied to the respective gas burner 2. That is to say that the gas control valves 4 may take the form of stepped gas control valves, or so-called step valves. Moreover, the household cooking appliance 1 may include a door 5 provided on the front side. The door 5 may for example be an oven door. For the purpose of being opened and closed, the door 5 may be pivoted about a pivot axis provided at a lower end of the door 5. As an alternative, the door 5 may be arranged on an oven carriage that may be pulled out of the household cooking appliance 1.

[0050] FIG. 2 shows a schematic exploded perspective view of an embodiment of a gas burner 2. The gas burner 2 includes a nozzle holder 6, a burner base 7 arranged on the nozzle holder 6, an intermediate element 8 arranged on the burner base 7, and a burner lid 9 arranged on the intermediate element 8. Here, the burner base 7 is arranged between the nozzle holder 6 and the intermediate element 8, and the intermediate element 8 is arranged between the burner base 7 and the burner lid 9.

[0051] The nozzle holder 6, the burner base 7, the intermediate element 8 and the burner lid 9 are each made for example of an aluminum alloy or a magnesium alloy. For example, the nozzle holder 6, the burner base 7, the intermediate element 8 and the burner lid 9 may be die-cast aluminum parts or die-cast magnesium parts. The nozzle holder 6, the burner base 7, the intermediate element 8 and the burner lid 9 are mutually separate parts that together form a burner casing 10 of the gas burner 2.

[0052] FIGS. 3 and 4 each show a schematic sectional view of an embodiment of a gas burner arrangement 11 with a gas burner 2 of this kind. FIGS. 5 and 6 each show a schematic exploded cross-sectional view of the gas burner arrangement 11. Reference is made simultaneously to FIGS. 3 to 6 below.

[0053] The gas burner arrangement 11 includes one or more gas burners 2 and the hob plate 3. The hob plate 3 includes an upper side or front side 12, and a lower side or rear side 13. As seen in a direction of gravity g, the rear side 13 is arranged below the front side 12. The hob plate 3 includes an aperture 14 through which the gas burner 2 is guided. An aperture 14 of this kind may be associated with each gas burner 2. The aperture 14 may have a circular geometry. However, it is also possible for the aperture 14 to have any other desired geometry.

[0054] As shown in FIG. 7, the nozzle holder 6 includes a first bearing finger 15 and a second bearing finger 16. The bearing fingers 15, 16 are positioned at an angle to one another. The bearing fingers 15, 16 are part of a bearing surface 17 of the nozzle holder 6. The nozzle holder 6 bears against the rear side 13 of the hob plate 3 by means of the bearing surface 17. The second bearing finger 16 may have a plurality of receiving portions 18 to 21 in which an ignition element or thermocouple may be received. A thermocouple and an ignition element are associated with each gas burner 2.

[0055] The nozzle holder 6 includes an underlying body 22 (FIG. 8) in which a first gas nozzle 23 is received. A bore 24, which may for example take the form of a threaded bore, is made in the underlying body 22. The first gas nozzle 23 is screwed into the bore 24. The bore 24 is in fluidic connection with a connector 25 of the nozzle holder 6. A gas supply line (not shown) may be connected to the connector 25. In this way, a combustion gas may be supplied to the first gas nozzle 23 by way of the connector 25 and the bore 24.

[0056] Further provided in the underlying body 22 is a receiving portion 26 in which, at least in certain regions, the burner base 7 may be received. The receiving portion 26 may be constructed to be rotationally symmetrical about a center axis or axis of symmetry M of the gas burner 2. The first gas nozzle 23 is preferably likewise formed such that it is rotationally symmetrical about the axis of symmetry M. The receiving portion 26 may have a cylindrical geometry. However, the receiving portion 26 may also widen conically from the first gas nozzle 23 toward the bearing surface 17. Moreover, two first primary air openings 27, 28 are provided in the underlying body 22, and primary air P may be supplied to the first gas nozzle 23 with the aid of these.

[0057] Moreover, the nozzle holder 6 includes a flange 29 that extends above the bearing surface 17 and runs peripherally around the receiving portion 26. The flange 29 preferably takes the form of a ring. The flange 29 may, at least in certain regions, extend into the aperture 14 in the hob plate 3, or extend through it.

[0058] The nozzle holder 6 moreover includes a pot-shaped nozzle receiving portion 30 that is made in one piece with the underlying body 22. In particular, the nozzle receiving portion 30 is integrally formed with the underlying body 22. A second gas nozzle 31 is received in the nozzle receiving portion 30. The expression that the nozzle receiving portion 30 is pot-shaped should be understood to mean that it has a bottom 32 and a wall 33 that runs peripherally around the bottom 32. The expression that the wall 33 is closed should be understood to mean that it has no apertures or bores.

[0059] The nozzle receiving portion 30 is open in the direction of the bearing surface 17, or the direction of the rear side 13 of the hob plate 3. The nozzle receiving portion 30 encloses a cavity 34 in which the gas nozzle 31 is received. The cavity 34 penetrates the bearing surface 17. That is to say that an upper edge 35 of the wall 33 is part of the bearing surface 17. A bore 36 is made in, and penetrates, the bottom 32. The second gas nozzle 31 is received in the bore 36. For example, the second gas nozzle 31 is screwed into the bore 36. A gas supply line (not shown) may be connected at the bore 36 for the purpose of supplying combustion gas to the second gas nozzle 31.

[0060] Referring again to FIGS. 3 to 6, the burner base 6 includes a disk-shaped underlying portion 37, which may be constructed to be rotationally symmetrical about the axis of symmetry M, and a flange 38 that extends out of the underside of the underlying portion 37. The flange 38 is intended to bear against the inside of the aperture 14 of the hob plate 3. A first mixing chamber 39 is provided centered on the underlying portion 37 and rotationally symmetrical about the axis of symmetry M. The first mixing chamber 39 may taper conically from the first gas nozzle 23 toward the burner lid 9. The first mixing chamber 39 includes a wall 40 that is constructed to be tubular and rotationally symmetrical about the axis of symmetry M and is received in the receiving portion 26 of the nozzle holder 6. The first mixing chamber 39 moreover has an inflow edge 41 provided on the wall 40.

[0061] Moreover, a second mixing chamber 42 extends out of the underlying portion 37 in the direction of the nozzle receiving portion 30 of the nozzle holder 6. The second mixing chamber 42 includes a wall 43 and an inflow edge 44. The inflow edge 44 runs peripherally around the wall 43 in a ring. As shown by FIGS. 3 and 4, the second mixing chamber 42 is, at least in certain regions, received in the nozzle receiving portion 30. Here, the second gas nozzle 31 is arranged outside the second mixing chamber 42, and the first gas nozzle 23 is positioned outside the first mixing chamber 39. In particular, the first gas nozzle 23 is arranged at a spacing from the inflow edge 41 of the first mixing chamber 39, and the second gas nozzle 31 is positioned at a spacing from the inflow edge 44 of the second mixing chamber 42.

[0062] Further, a plurality of second primary air openings 45 is provided in the underlying portion 37 of the burner base 7, and these are in fluidic connection with the cavity 34 of the nozzle receiving portion 30. In particular, the second primary air openings 45 are in fluidic connection with the cavity 34 of the nozzle receiving portion 30 by way of the aperture 14 in the hob plate 3. That is to say that primary air P can be supplied to the nozzle receiving portion 30 by way of the second primary air openings 45 and the aperture 14 of the hob plate 3 (FIG. 3). As shown by FIG. 2, five such second primary air openings 45 may be provided. However, there may be any desired number of second primary air openings 45. Unlike the first primary air openings 27, 28, the second primary air openings 45 are positioned not below but above the hob plate 3.

[0063] On the upper side of the underlying portion 37 there extends a flange 46 that is constructed to be rotationally symmetrical about the axis of symmetry M. The first mixing chamber 39 passes through the flange 46. The flange 46 has a stepped upper edge.

[0064] The intermediate element 8 is constructed to be rotationally symmetrical about the axis of symmetry M, and includes a disk-shaped underlying portion 47. Centered on the underlying portion 47 is an aperture 48 that is stepped in a manner corresponding to the flange 46. The flange 46 of the burner base 7 is received in the aperture 48. In particular, the flange 46 is supported on the aperture 48.

[0065] On the upper sidethat is to say facing the burner lid 9the intermediate element 8 has a plurality of duct-shaped first mixture outlet openings 49. There may be any desired number of first mixture outlet openings 49. Preferably, the first mixture outlet openings 49 are arranged evenly distributed around a periphery of the intermediate element 8. The first mixture outlet openings 49 are part of a first flame ring 50 of the gas burner 2.

[0066] On the undersidethat is to say associated with the burner base 7the intermediate element 8 includes a plurality of second mixture outlet openings 51. There may be any desired number of second mixture outlet openings 51. Preferably, the second mixture outlet openings 51 are arranged evenly distributed around a periphery of the intermediate element 8. The second mixture outlet openings 51 are part of a second flame ring 52 (FIG. 5) of the gas burner 2.

[0067] Between the burner lid 9 and the intermediate element 8 there is provided a first mixture distribution chamber 53 with which the first mixture outlet openings 49 are associated. Between the intermediate element 8 and the burner base 7 there is provided a second mixture distribution chamber 54 with which the second mixture outlet openings 51 are associated. Here, the first mixture distribution chamber 53 is not in fluidic connection with the second mixture distribution chamber 54. The mixture distribution chambers 53, 54 are separated from one another with the aid of the intermediate element 8. However, the mixture distribution chambers 53, 54 may also be connected to one another with the aid of an optional aperture 55 in the underlying portion 47. The first mixture distribution chamber 53 is in fluidic connection with the first mixing chamber 39, and the second mixture distribution chamber 54 is in fluidic connection with the second mixing chamber 42.

[0068] The functionality of the gas burner arrangement 11 and the gas burner 2 is explained below with reference to FIG. 3. As explained above, the gas burner 2 includes a first flame ring 50 and a second flame ring 52. The first flame ring 50 is associated for example with a maximum burning operation of the gas burner 2. The second flame ring 52 may be suitable for a minimum burning operation of the gas burner 2. In maximum burning operation, in particular both flame rings 50, 52 may be operated. During operation of the gas burner 2, the combustion gas B is supplied to the first gas nozzle 23 and the second gas nozzle 31. In this arrangement, the combustion gas B is supplied with the aid of the bores 24, 36 shown in FIG. 8.

[0069] The combustion gas B streams out of the first gas nozzle 23 and into the first mixing chamber 39. During this, primary air P is drawn in by suction, laterally through the first primary air openings 27, 28, and streams over the inflow edge 41 of the first mixing chamber 39 and into the latter. As a result of the combustion gas B streaming out, a Venturi effect is generated, and this draws the primary air P in by suction from below the hob plate 3, out of an inner space I of the household cooking appliance 1. The combustion gas B is mixed with the primary air P in the first mixing chamber 39 to form a mixture of combustion gas and primary air, and this is supplied to the first mixture distribution chamber 53. From the first mixture distribution chamber 53, the mixture of combustion gas and primary air is distributed evenly over the first mixture outlet openings 49 and streams out of these into an area U surrounding the gas burner arrangement 11. With a supply of secondary air, the mixture of primary air and combustion gas burns, forming a first burner flame.

[0070] In an analogous manner, the combustion gas B streams out of the second gas nozzle 31 and into the second mixing chamber 42. As a result of the combustion gas B streaming in, primary air P is drawn in by suction, from above the hob plate 3, through the second primary air openings 45, and supplied to the nozzle receiving portion 30. The primary air P is then drawn in by suction, over the inflow edge 44 and into the second mixing chamber 42, where it is mixed with the combustion gas B to form the mixture of combustion gas and primary air. From the second mixing chamber 42, the mixture of combustion gas and primary air is supplied to the second mixture distribution chamber 54, and from there it is distributed over the second mixture outlet openings 51. The mixture of combustion gas and primary air then streams out of the gas burner 2 and burns at the surrounding area U, forming a second burner flame.

[0071] Because the second primary air openings 45 draw the primary air P in from above the hob plate 3that is to say out of the surrounding air Uand not, like the first primary air openings 27, 28, from below the hob plate 3, or the inner space I of the household cooking appliance 1, it is possible, in particular in a minimum burning operation of the gas burner 2, to reliably prevent the gas burner 2 from being extinguished, for example as a result of pressure pulses, which may be caused by opening or closing the door 5.

REFERENCE CHARACTERS USED

[0072] 1 Household cooking appliance [0073] 2 Gas burner [0074] 3 Hob plate [0075] 4 Gas control valve [0076] 5 Door [0077] 6 Nozzle holder [0078] 7 Burner base [0079] 8 Intermediate element [0080] 9 Burner lid [0081] 10 Burner casing [0082] 11 Gas burner arrangement [0083] 12 Front side [0084] 13 Rear side [0085] 14 Aperture [0086] 15 Bearing finger [0087] 16 Bearing finger [0088] 17 Bearing surface [0089] 18 Receiving portion [0090] 19 Receiving portion [0091] 20 Receiving portion [0092] 21 Receiving portion [0093] 22 Underlying body [0094] 23 Gas nozzle [0095] 24 Bore [0096] 25 Connector [0097] 26 Receiving portion [0098] 27 Primary air opening [0099] 28 Primary air opening [0100] 29 Flange [0101] 30 Nozzle receiving portion [0102] 31 Gas nozzle [0103] 32 Bottom [0104] 33 Wall [0105] 34 Cavity [0106] 35 Upper edge [0107] 36 Bore [0108] 37 Underlying portion [0109] 38 Flange [0110] 39 Mixing chamber [0111] 40 Wall [0112] 41 Inflow edge [0113] 42 Mixing chamber [0114] 43 Wall [0115] 44 Inflow edge [0116] 45 Primary air opening [0117] 46 Flange [0118] 47 Underlying portion [0119] 48 Aperture [0120] 49 Mixture outlet opening [0121] 50 Flame ring [0122] 51 Mixture outlet opening [0123] 52 Flame ring [0124] 53 Mixture distribution chamber [0125] 54 Mixture distribution chamber [0126] 55 Aperture [0127] B Combustion gas [0128] g Direction of gravity [0129] I Inner space [0130] M Axis of symmetry [0131] P Primary air [0132] U Surrounding area