Gas burner, gas burner assembly and domestic cooking appliance

Abstract

A gas burner for a household cooking appliance includes a burner casing including a plurality of mixture outlet openings configured to guide out, during operation of the gas burner, a mixture of combustion gas and primary air into an area surrounding the gas burner for producing a burner flame. A mixture distribution chamber evenly distributes the mixture of combustion gas and primary air to the mixture outlet openings. Fluidly connected with the mixture distribution chamber is a storage chamber for storing, during operation of the gas burner, part of the mixture of combustion gas and primary air. The storage chamber includes an ignition flame opening configured to guide out the mixture of combustion gas and primary air that is stored in the storage chamber into the surrounding area for producing an ignition flame.

Claims

1. A gas burner for a household cooking appliance, said gas burner comprising: a burner casing comprising a plurality of mixture outlet openings configured to guide out, during operation of the gas burner, a mixture of combustion gas and primary air into an area surrounding the gas burner for producing a burner flame; a mixture distribution chamber for evenly distributing the mixture of combustion gas and primary air to the mixture outlet openings; and a storage chamber in fluidic connection with the mixture distribution chamber for storing, during operation of the gas burner, part of the mixture of combustion gas and primary air, said storage chamber comprising an ignition flame opening configured to guide out the mixture of combustion gas and primary air that is stored in the storage chamber into the surrounding area for producing an ignition flame, wherein the storage chamber is in fluidic connection with the mixture distribution chamber via a supply opening and runs peripherally around the mixture distribution chamber in a ring shape extending from the supply opening to the ignition flame opening, the storage chamber has a first end portion and a second end portion in opposition to the first end portion, the ignition flame opening being provided at the first end portion of the storage chamber, and the supply opening being provided at the second end portion of the storage chamber, and the ignition flame opening and the supply opening are at a maximum possible distance from one another along a length of the ring shape of the storage chamber.

2. The gas burner of claim 1, wherein the storage chamber runs peripherally around the mixture distribution chamber in a ring shape.

3. The gas burner of claim 2, wherein the storage chamber has a ring-shaped geometry which is open.

4. The gas burner of claim 1, wherein the storage chamber has a rectangular cross section.

5. The gas burner of claim 1, wherein the mixture distribution chamber and the storage chamber are constructed to be rotationally symmetrical about an axis of symmetry of the burner casing.

6. The gas burner of claim 1, wherein the storage chamber is in fluidic connection with the mixture distribution chamber via a supply opening.

7. The gas burner of claim 6, wherein the storage chamber forms a cavity that, apart from the ignition flame opening and the supply opening, is entirely surrounded by the burner casing.

8. The gas burner of claim 6, wherein the storage chamber has a first end portion and a second end portion in opposition to the first end portion, said ignition flame opening being provided at the first end portion of the storage chamber, and said supply opening being provided at the second end portion of the storage chamber.

9. The gas burner of claim 1, wherein the burner casing comprises a nozzle holder, a burner base and a burner lid, said burner base being arranged between the nozzle holder and the burner lid.

10. The gas burner of claim 9, wherein the mixture distribution chamber and the storage chamber are provided in the burner base.

11. The gas burner of claim 9, wherein the burner casing includes a closure plate configured to close off the storage chamber in a direction towards the nozzle holder.

12. The gas burner of claim 9, wherein the burner base comprises a mixing chamber in fluidic connection with the mixture distribution chamber for mixing combustion gas with primary air, said mixing chamber extending at least in part through the mixture distribution chamber.

13. The gas burner of claim 12, wherein the nozzle holder comprises a gas nozzle for injecting combustion gas into the mixing chamber, said gas nozzle being arranged at a distance from an inflow edge of the mixing chamber.

14. A gas burner arrangement, comprising: a hob plate; and a gas burner mounted on the hob plate, said gas burner comprising a burner casing comprising a plurality of mixture outlet openings configured to guide out, during operation of the gas burner, a mixture of combustion gas and primary air into an area surrounding the gas burner for producing a burner flame, a mixture distribution chamber for evenly distributing the mixture of combustion gas and primary air to the mixture outlet openings, and a storage chamber in fluidic connection with the mixture distribution chamber for storing, during operation of the gas burner, part of the mixture of combustion gas and primary air, said storage chamber comprising an ignition flame opening configured to guide out the mixture of combustion gas and primary air that is stored in the storage chamber into the surrounding area for producing an ignition flame, wherein the storage chamber is in fluidic connection with the mixture distribution chamber via a supply opening and runs peripherally around the mixture distribution chamber in a ring shape extending from the supply opening to the ignition flame opening, the storage chamber has a first end portion and a second end portion in opposition to the first end portion, the ignition flame opening being provided at the first end portion of the storage chamber, and the supply opening being provided at the second end portion of the storage chamber, and the ignition flame opening and the supply opening are at a maximum possible distance from one another along a length of the ring shape of the storage chamber.

15. A household cooking appliance, comprising at least one of a gas burner and a gas burner arrangement, said gas burner comprising a burner casing comprising a plurality of mixture outlet openings configured to guide out, during operation of the gas burner, a mixture of combustion gas and primary air into an area surrounding the gas burner for producing a burner flame, a mixture distribution chamber for evenly distributing the mixture of combustion gas and primary air to the mixture outlet openings, and a storage chamber in fluidic connection with the mixture distribution chamber for storing, during operation of the gas burner, part of the mixture of combustion gas and primary air, said storage chamber comprising an ignition flame opening configured to guide out the mixture of combustion gas and primary air that is stored in the storage chamber into the surrounding area for producing an ignition flame, said gas burner arrangement comprising a hob plate, said gas burner being mounted on the hob plate, wherein the storage chamber is in fluidic connection with the mixture distribution chamber via a supply opening and runs peripherally around the mixture distribution chamber in a ring shape extending from the supply opening to the ignition flame opening, the storage chamber forms an enclosed hollow that is only in fluidic connection with the surrounding area by way of the ignition flame opening and with the mixture distribution chamber by way of the supply opening, and the ignition flame opening and the supply opening are at a maximum possible distance from one another along a length of the ring shape of the storage chamber.

16. The household cooking appliance of claim 15, constructed in the form of a gas cooker.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantageous configurations and aspects of the gas burner, 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, the gas burner arrangement and/or the household cooking appliance. Below, the gas burner, 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.

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

(3) FIG. 2 shows a schematic sectional view of an embodiment of a gas burner arrangement for the household cooking appliance according to FIG. 1;

(4) FIG. 3 shows a further schematic sectional view of the gas burner arrangement according to FIG. 2;

(5) FIG. 4 shows a schematic exploded cross-sectional view of the gas burner arrangement according to FIG. 2;

(6) FIG. 5 shows a further schematic exploded cross-sectional view of the gas burner arrangement according to FIG. 2;

(7) FIG. 6 shows a schematic perspective view of an embodiment of a burner base of a gas burner for the gas burner arrangement according to FIG. 2;

(8) FIG. 7 shows a further schematic perspective view of the burner base according to FIG. 6;

(9) FIG. 8 shows a schematic exploded cross sectional view of the burner base according to FIG. 6;

(10) FIG. 9 shows a further schematic exploded cross sectional view of the burner base according to FIG. 6; and

(11) FIG. 10 shows a schematic sectional view of the burner base according to FIG. 6.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS OF THE PRESENT INVENTION

(12) In the figures, like or functionally equivalent elements have been provided with the same reference characters unless indicated otherwise.

(13) 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 comprises 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 shape and is intended to protect the hob plate 3 from being heated by the dissipation of waste heat by the gas burners 2.

(14) 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 4A, with the aid of which a stream of combustion gas that is supplied to the respective gas burner 2 may be selectively switched on, switched off and, in particular continuously variably, adjusted. As an alternative, the gas control valves 4A 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 4A may take the form of stepped gas control valves, or so-called step valves. Moreover, the household cooking appliance 1 comprises a door 4B. The door 4B may be for example an oven door of the household cooking appliance 1. For the purpose of being opened and closed, the door 4B may be pivoted about a pivot axis provided at a lower end of the door 4B. As an alternative, the door 4B may be arranged on an oven carriage that may be pulled out of the household cooking appliance 1.

(15) FIGS. 2 and 3 each show a schematic sectional view of a gas burner arrangement 5 for the household cooking appliance 1 according to FIG. 1. FIGS. 4 and 5 each show a schematic exploded cross sectional view of the gas burner arrangement 5. Below, reference will be made simultaneously to FIGS. 2 to 5.

(16) The gas burner arrangement 5 comprises the hob plate 3, which has a front side 6 and, remote from the front side 6, a rear side 7. As seen in a direction of gravity g, the rear side 7 is arranged below the front side 6. Moreover, the hob plate 3 comprises an aperture 8. The aperture 8 may take a circular form. The gas burner 2 is guided through the aperture 8. The gas burner arrangement 5 may, as mentioned above, comprise a plurality of gas burners 2, in which case an aperture 8 of this kind is associated with each gas burner 2.

(17) The gas burner 2 comprises a nozzle holder 9, which is arranged below the hob plate 3 and abuts against the rear side 7 thereof, a burner base 10, which is arranged above the hob plate 3 such that the hob plate 3 is positioned between the nozzle holder 9 and the burner base 10, and a burner lid 11. The burner lid 11 is laid on the burner base 10 such that the burner base 10 is arranged between the nozzle holder 9 and the burner lid 11. The nozzle holder 9, the burner base 10 and the burner lid 11 are mutually separate parts.

(18) The nozzle holder 9, the burner base 10 and the burner lid 11 are made for example from an aluminum alloy or a magnesium alloy. For example, the nozzle holder 9, the burner base 10 and the burner lid 11 may each be made as die-cast aluminum parts or die-cast magnesium parts. The nozzle holder 9, the burner base 10 and the burner lid 11 are part of a burner casing 12 of the gas burner 2.

(19) The nozzle holder 9 comprises an underlying body 13 in which there is made a bore 14. Combustion gas B may be supplied to the nozzle holder 9 through the bore 14 (FIG. 2). Received in the bore 14 is a gas nozzle 15. For example, the gas nozzle 15 is screwed into the bore 14. Moreover, the underlying body 13 comprises a bearing surface 16 (FIG. 5) by means of which the nozzle holder 9 abuts against the rear side 7 of the hob plate 3. Moreover, the underlying body 13 comprises a receiving portion 17 (FIG. 4, FIG. 5) that may be constructed to be rotationally symmetrical about a center axis or axis of symmetry M of the gas burner 2. The receiving portion 17 is cylindrical. The burner base 10 may be received, at least in certain regions, in the receiving portion 17. Moreover, two primary air openings 18, 19 are provided in the underlying body 13. With the aid of the primary air openings 18, 19, primary air P may be supplied to the gas nozzle 15 (FIG. 2). The primary air openings 18, 19 open into the receiving portion 17.

(20) The burner lid 11 has a disk-shaped underlying portion 20. On the underside—that is to say facing the burner base 10—a plurality of mixture outlet openings 21 is provided on the underlying portion (FIG. 4). There may be any desired number of mixture outlet openings 21. The mixture outlet openings 21 are preferably arranged evenly distributed over a periphery of the burner lid 11. Provided between the burner lid 11 and the burner base 10 is a mixture distribution chamber 22, with the aid of which a mixture of combustion gas and primary air B/P (FIG. 2) may be distributed evenly to the mixture outlet openings 21. Associated with the burner base 10 is a mixing chamber 23. The mixing chamber 23 is in fluidic connection with the mixture distribution chamber 22.

(21) As shown in FIGS. 6 to 10, the burner base 10 comprises a disk-shaped underlying portion 24. The underlying portion 24 is constructed to be rotationally symmetrical about the axis of symmetry M. Two apertures 25, 26 may be made in the underlying portion 24. Screws may pass through the apertures 25, 26 in order to screw the burner base 10 to the nozzle holder 9.

(22) The mixing chamber 23 is provided centrally on the disk-shaped underlying portion 24 and is surrounded by a wall 27. The wall 27 projects into the mixture distribution chamber 22. An inflow edge 28 of the mixing chamber 23 that runs peripherally around in a ring shape is positioned such that the gas nozzle 15 is arranged at a distance from the inflow edge 28. That is to say that the gas nozzle 15 is not positioned within the mixing chamber 23.

(23) Moreover, the burner base 10 comprises two receiving portions 29, 30 in which an ignition element and a thermocouple may be received. Running peripherally around the underlying portion in a ring shape there is provided a flange 31 that abuts against the aperture 8 in the hob plate 3. A bearing surface 32 abuts against the front side 6 of the hob plate 3. A wall 33 runs peripherally around the wall 27 in a ring shape. Provided between the wall 33 and the wall 27 is the mixture distribution chamber 22.

(24) Provided in the wall 33 is a storage chamber 34. The storage chamber 34 is provided for example in the form of a rectangular groove that extends at least in certain regions into the wall 33. In this case, the storage chamber 34 runs peripherally around the mixture distribution chamber 22 in a ring shape. However, in this case the ring-shaped geometry of the storage chamber 34 is not closed. That is to say that—as shown in FIG. 7—the storage chamber 34 does not run around the mixture distribution chamber 22 in a peripheral angle of 360° but for example in a peripheral angle of only 300°. The storage chamber 34 is open in the direction of the front side 6 of the hob plate 3 and is closed off with the aid of a closure plate 35, for example with the aid of a metal closure sheet glued to the nozzle holder 9. The closure plate 35 is a separate part from the nozzle holder 9.

(25) As shown in FIG. 6, the storage chamber 34 comprises an ignition flame opening 36. The ignition flame opening 36 faces an area U (FIG. 1) surrounding the gas burner 2. The ignition flame opening 36 may take the form of a bore that passes partly through the wall 33. Moreover, the storage chamber 34 comprises a supply opening 37, with the aid of which the storage chamber 34 is in fluidic connection with the mixture distribution chamber 22. The supply opening 37 may take the form of a bore that passes partly through the wall 33. The supply opening 37 may in this case have a larger diameter than the ignition flame opening 36.

(26) The storage chamber 34 is constructed to be rotationally symmetrical about the axis of symmetry M. The storage chamber 34 forms a cavity in the burner casing 12 or burner base 10 that, apart from the ignition flame opening 36 and the supply opening 37, is entirely surrounded by the burner casing 12. The ignition flame opening 36 is provided at a first end portion 38 (FIG. 7) of the storage chamber 34, and the supply opening 37 is provided at a second end portion 39 (FIG. 7) of the storage chamber 34, at the opposite end to the first end portion 38. In this way, the ignition flame opening 36 and the supply opening 37 are at the maximum possible distance from one another. That is to say that the mixture of combustion gas and primary air B/P has to cover the greatest possible path in the storage chamber 34 from the supply opening 37 to the ignition flame opening 36.

(27) The functionality of the gas burner 2 and the gas burner arrangement 5 is explained below with reference to FIG. 2. During operation of the gas burner 2, the combustion gas B is supplied to the gas nozzle 15 through the bore 14. The combustion gas B flows out of the gas nozzle 15 and is injected into the mixing chamber 23. This produces a Venturi effect, as a result of which the primary air P is drawn in by suction through the primary air openings 18, 19 and into the mixing chamber 23. In the mixing chamber 23, the primary air P mixes with the combustion gas B. The resulting mixture of combustion gas and primary air B/P is distributed evenly to the mixture outlet openings 21 with the aid of the mixture distribution chamber 22, wherein the mixture of combustion gas and primary air B/P is guided out into the area U surrounding the gas burner 2 for the purpose of producing a burner flame 40.

(28) At the same time, some of the mixture of combustion gas and primary air B/P is supplied through the supply opening 37 to the storage chamber 34. Some of the mixture of combustion gas and primary air B/P is stored in the storage chamber 34, wherein the mixture of combustion gas and primary air B/P stored in the storage chamber 34 is guided through the ignition flame opening 36 and out into the surrounding area U for the purpose of producing a pilot flame or ignition flame 41.

(29) In the surrounding area U, the mixture of combustion gas and primary air B/P burns, forming the ignition flame 41 or the burner flame 40. The ignition flame 41 burns continuously when the gas burner 2 is in operation. If the burner flame 40 is extinguished, for example because of a brief interruption in the incoming flow of combustion gas B or a pressure pulse caused for example by opening or closing the door 4B, the ignition flame 41 continues to burn, because the mixture of combustion gas and primary air B/P stored in the storage chamber 34 continues to flow out of the ignition flame opening 36. The storage chamber 34 may be intended to store the mixture of combustion gas and primary air B/P such that if the burner flame 40 is extinguished the ignition flame 41 continues to burn for periods from a few fractions of a second to a few seconds.

(30) Because the storage chamber 34 is provided for the purpose of storing the mixture of combustion gas and primary air B/P, the ignition flame 41 can continue to burn even in the event of a brief interruption in the supply of combustion gas and/or in the event of extinction of the burner flame 40 without an additional gas supply line to the ignition flame opening 36. As a result, legal requirements, for example under DIN EN 30, can be met. In particular, tests comprising the opening and closing of the door 4B can be performed without the gas burner 2 being completely extinguished. Moreover, the ignition flame 41 may also be used for flame detection.