EP3748230B1

EP3748230B1 - Gas burner assembly

Info

Publication number: EP3748230B1
Application number: EP19177836.4A
Authority: EP
Inventors: Ferdinando VIVACQUA; Riccardo EUSEPI; Areli URIBE PORTUGAL
Original assignee: Electrolux Appliances AB
Current assignee: Electrolux Appliances AB
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2024-03-20
Anticipated expiration: 2039-06-03
Also published as: EP3748230A1; ES2981446T3

Description

The present invention relates to a gas burner assembly. Further, the present invention relates to a gas burner assembly for a gas cooking appliance. Moreover, the present invention relates to a gas cooking appliance, in particular a domestic gas cooking hob.
Conventional gas burner assemblies often include a base part acting as a holder for an injector. Usually, such base parts have a rectangular cross section and forming a kind of shell. However, such base parts are over-dimensioned and require a lot of material. Further the weight of the gas burner assembly with the base part is relative high. Moreover, the manufacturing of such base parts and gas burner assemblies is very complex.
US 6 067 978 A discloses a gas burner assembly according to the preamble of claim 1.
EP 1 616 132 A1 resp. WO 2004/092655 A1 discloses a gas cooker burner. The gas cooker burner comprises a lower hollow body, on which a disk with a large annular crown is centred and positioned. The crown features a dense series of radial notches and is covered by a circular plate.
EP 2 246 619 A1 discloses gas burner comprising a bowl-shaped bas body, a burner crown arranged on the bas body and an upper cap arranged on the burner crown.
EP 1 159 565 A1 resp. WO 00/40900 discloses a deep drawn burner. The air-gas mixture chamber had an inferior central gap at its bottom; a burner tap which is sat into that chamber by more than one sitting legs and which has a central gap in its middle part; and a gas injector holder which is fixed by centering on inferior central gap; and characterized by more than one centering legs which provide intersecting of vertical axis of burner tap central gap located beneath burner tap with those of central gap of air gas mixture chamber.
WO 2007 068659 A1 discloses a cooking device with a burner head. The burner head is utilized on a burner plate. The burner head comprises a burner body, a first burner head and a second burner head and a burner cap.
EP 1 531 304 A2 discloses a gas burner for a cooking hob including a circular body with at least one peripheral flame crown and one central flame crown, each of them with its respective annular chamber for distributing the mixture.
It is an object of the present invention to provide a base part for a gas burner assembly, which allows improved flow conditions of the gas-air mixture by low complexity.
The object is achieved by the gas burner assembly according to claim 1.
The core of the present invention is the shape of the shell. The inner side of the shell is formed as a circumferential surface of a truncated cone, wherein the at least one injector is arranged in the deepest position of said shell. This allows a very smooth inner surface around the injector. In particular, the smooth surface around the injector improves the composition and the flow conditions of the gas-air mixture within the shell. Further, the smooth surface of the shell is easy to clean.
In particular, the base part includes at least one gas inlet arranged beneath the shell, wherein preferably said gas inlet is arranged in a lower and/or outer portion of the base part.
Preferably, the base part includes at least one gas channel, in particular a horizontal gas channel, interconnected between the gas inlet and the injector.
Further, the inner side of the shell of the base part may be formed as smooth surface without any bends.
Moreover, one or more pockets may be formed in the upper portion of the shell of the base part, wherein said pocket is provided for receiving an element of a burner crown.
Additionally, the base part may include at least one pin, preferably at least two or at least three pins, for fixing and/or aligning said base part on a bottom of the gas cooking appliance. In particular, said pin or pins, respectively, extend downwards.
According to another embodiment of the present invention, the shell of the base part is formed as an integrated part of a work plate of the gas cooking appliance. Preferably, the shell of the base part is embossed in the work plate of the gas cooking appliance. In particular, the shell of the base part is a deformation in the work plate of the gas cooking appliance. The shell of the base part may be obtained by forging the sheet for the work plate. Further, the shell of the base part may be obtained by cold stamping the sheet for the work plate. Alternatively, the shell of the base part may be a separate component fixed to the work plate by suitable fastening elements. The shell formed as integrated part of the work plate reduces the number of components of the gas burner assembly.
The present invention relates to a gas burner assembly for a gas cooking appliance, wherein said gas burner assembly comprises at least one base part mentioned above.
The gas burner assembly comprises an intermediate part arranged above the base part, wherein preferably said intermediate part includes a vertical Venturi pipe in its central portion, so that the Venturi pipe is arranged above the injector.
Additionally, the gas burner assembly comprises a burner crown arranged above the intermediate part, wherein the burner crown includes a plurality of flame ports, and wherein preferably a prechamber is formed between the burner crown and the intermediate part.
The burner crown includes an inner central chamber and an outer annular chamber, wherein the inner central chamber is covered by an inner burner cap and the outer annular chamber is covered by an outer burner cap.
For example, a plurality of inner flame ports is formed in a circumferential side wall of the inner central chamber, wherein preferably the inner burner cap is formed as a circular disk.
Additionally, a plurality of outer flame ports is formed in an inner and/or outer circumferential side wall of the outer annular chamber, wherein preferably the outer burner cap is formed as a circular ring.
According to the invention, the plurality of outer flame ports is formed in the outer circumferential side wall of the outer annular chamber, wherein the outer burner cap is formed as the circular ring and inclined in radial direction, so that the level of the outer burner cap rises from inside to outside.
In particular, an upper side of the base part is open, so that the gas burner assembly takes primary fresh air from outside of the work plate.
Further, the present invention relates to a gas cooking appliance, in particular a domestic gas cooking hob, wherein the gas cooking appliance comprises at least one gas burner assembly mentioned above.
Novel and inventive features of the present invention are set forth in the appended claims.
The present invention will be described in further detail with reference to the drawing, in which

FIG 1: illustrates a schematic sectional side view of a gas burner assembly according to a first embodiment of the present invention,
FIG 2: illustrates a schematic perspective view of a base part for the gas burner assembly according to the first embodiment of the present invention,
FIG 3: illustrates a schematic sectional side view of a base part of the gas burner assembly according to a second embodiment of the present invention,
FIG 4: illustrates a schematic sectional side view of the gas burner assembly according to a third embodiment of the present invention,
FIG 5: illustrates a schematic perspective view of a base part for the gas burner assembly according to the third embodiment of the present invention, and
FIG 6: illustrates a schematic perspective view of the gas burner assembly according to the third embodiment of the present invention.

FIG 1 illustrates a schematic sectional side view of a gas burner assembly 10 according to a first embodiment of the present invention. The gas burner assembly 10 is provided for a gas cooking appliance, in particular for a domestic gas cooking hob.
The gas burner assembly 10 comprises a base part 12, an intermediate part 14, a burner crown 16, an outer burner cap 18 and an inner burner cap 20. The intermediate part 14 is arranged above the base part 12. In turn, the burner crown 16 is arranged above the intermediate part 14. The outer burner cap 18 and the inner burner cap 20 are arranged on the burner crown 16. The outer burner cap 18 is formed as a circular ring and inclined in radial direction, wherein the level of the outer burner cap 18 rises from inside to outside. The inner burner cap 20 is formed as a circular disk.
The base part 12 includes a gas inlet 22, a shell 24 and a horizontal gas channel 28. The gas channel 28 is only provided for delivering gas up to the level of the injector 26. An external gas supply tube is connectable to the gas inlet 22 forming the entrance of the gas channel 28. The shell 24 has an open top side. An injector 26 is arranged in the centre of the shell 24, wherein said centre is the deepest position of the shell 24. The gas inlet 22 is arranged in a lower and outer portion of the base part 12. The horizontal gas channel 28 is interconnected between the gas inlet 22 and the centre of the shell 24, wherein the injector 26 is arranged. Further, the base part 12 includes a pin 42 for fixing and/or aligning said base part 12 on a bottom 46 of the gas cooking appliance. In this example, said pin 42 extends downwards.
The inner side of the shell 24 is formed as a circumferential surface of a truncated cone. The inner surface of the shell 24 is very smooth. Said smooth surface allows that the shell 24 and the base part 12 are easy to clean. In particular, the smooth surface around the injector 26 improves the composition and the flow conditions of the gas-air mixture within the shell 24.
Optionally, also the outer side of the shell 24 is formed as a circumferential surface of a truncated cone. In this case, the wall thickness of the shell 24 may be relative small resulting in low costs of material. This allows a light weight construction of the base part 12. Further, this contributes to a lightweight and compact construction of the gas burner assembly 10.
The intermediate part 14 is arranged above the base part 12. A vertical Venturi pipe 30 is formed in the centre of said intermediate part 14. Thus, the vertical Venturi pipe 30 is arranged above the injector 26. The burner crown 16 is arranged above the intermediate part 14. A prechamber 32 is formed between the intermediate part 14 and the burner crown 16. The height of said prechamber 32 increases radially, from inside to outside. The burner crown 16 includes an inner central chamber 34 and an outer annular chamber 36 connected to the prechamber 32.
The burner crown 16 includes a plurality of inner flame ports 38 and a plurality of outer flame ports 40. The inner flame ports 38 are formed in a circumferential side wall of the inner central chamber 34. The outer flame ports 40 are formed in a circumferential side wall of the outer annular chamber 36. Thus, an outer ring of flames encloses the outer annular chamber 36, while an inner ring of flames is arranged between the inner central chamber 34 and the outer annular chamber 36.
The inner central chamber 34 is covered by the inner burner cap 20, while the outer annular chamber 36 is covered by the outer burner cap 18 formed as circular ring. The outer burner cap 18 and the inner burner cap 20 are arranged concentrically to each other. Substantially, the outer burner cap 18 and the inner burner cap 20 are arranged at the same level. The outer ring of flames encloses the outer burner cap 18, while the inner ring of flames is arranged between the inner burner cap 20 and the outer burner cap 18.
The gas burner assembly 10 is arranged within a cut-out of a work plate 48 of the gas cooking hob. The intermediate part 14, the burner crown 16, the outer burner cap 18 and the inner burner cap 20 are arranged above the base part 12 which in turn is arranged within the cut-out of the work plate 48. The base part 12 is substantially arranged beneath the work plate 48, the intermediate part 14 and the burner crown 16. The outer burner cap 18 and the inner burner cap 20 are supported by the base part 12. The intermediate part 14 and the burner crown 16 are joined. The outer burner cap 18 and the inner burner cap 20 are arranged above the burner crown 16. The burner crown 16 is supported by the base part 12 and fixed through the cut-out of the work plate 48. The base part 12 includes a number of screw holes 50 for fastening said base part on the work plate 48. In this example, the base part 12 includes four screw holes 50.
FIG 2 illustrates a schematic perspective view of the base part 12 of the gas burner assembly 10 according to the first embodiment of the present invention.
The base part 12 includes the gas inlet 22, the shell 24 with the open top side, the horizontal gas channel 28 and the pin 42. The injector 26 is arranged in the centre of the shell 24, which is the deepest position of the shell 24. The gas inlet 22 is arranged in the lower and outer portion of the shell 24. The horizontal gas channel 28 is interconnected between the gas inlet 22 and the centre of the shell 24. The pin 42 is provided for fixing and/or aligning the base part 12 on the bottom 46 of the gas cooking appliance. Preferably, at least three pins 42 for fixing and/or aligning the base part 12 on the bottom of the gas cooking appliance are provided. In particular, said pins 42 extend downwards.
The inner side of the shell 24 is formed as a circumferential surface of a truncated cone. The smooth surface allows that the shell 24 and the base part 12 are easy to clean. Further, the smooth surface around the injector 26 improves the composition and the flow conditions of the gas-air mixture within the shell 24. Moreover, the shell 24 of the base part 12 includes pockets 44 in its upper portion for assembling and centring the burner crown 16, the outer burner cap 18 and the inner burner cap 20. The injector 26 withdraws fresh air on the top side of the work plate 48. The gas burner assembly 10 is a top-breather burner. In contrast, the shell 24 does not have any opening arranged beneath said work plate 48. Thus, the injector 26 cannot suck air from the bottom side of the work plate 48.
FIG 3 illustrates a schematic sectional side view of a base part 12 of the gas burner assembly 10 according to a second embodiment of the present invention.
The base part 12 of the second embodiment is an integrated part of the work plate 48 of the gas cooking hob. The shell 24 of the base part 12 is a deformation in the work plate 48. The shell 24 of the base part 12 is obtained by embossing the sheet for the work plate 48 or other manufacturing techniques. For example, the shell 24 of the base part 12 is obtained by forging the sheet for the work plate 48. Further, the shell 24 of the base part 12 may be obtained by cold stamping the sheet for the work plate 48. This embodiment reduces the number of components of the gas burner assembly 10.
The base part 12 includes the gas inlet 22, the shell 24 with the open top side, the horizontal gas channel 28 and the gas inlet 22. A gas supply tube 52 is inserted into the gas inlet 22. The injector 26 is arranged in the centre of the shell 24. Said centre is the deepest position of the shell 24. The gas inlet 22 is arranged in the lower portion of the shell 24. The horizontal gas channel 28 is interconnected between the gas inlet 22 and the centre of the shell 24. In this example, the shell 24 is formed as a circumferential surface of a truncated cone.
Alternatively, the shell 24 of the base part 12 may be a separate component and fixed to the work plate 48 by suitable fastening elements.
FIG 4 illustrates a schematic sectional side view of the gas burner assembly 10 according to a third embodiment of the present invention.
The gas burner assembly 10 comprises the base part 12, the intermediate part 14, the burner crown 16, the outer burner cap 18 and the inner burner cap 20. The intermediate part 14 is arranged above the base part 12, while the burner crown 16 is arranged above the intermediate part 14. The outer burner cap 18 and the inner burner cap 20 are arranged on the burner crown 16. The outer burner cap 18 is formed as circular ring and inclined in radial direction, wherein the level of the outer burner cap 18 rises from inside to outside. The inner burner cap 20 is formed as circular disk.
The base part 12 includes a first gas inlet 22A and a second gas inlet 22B, wherein only the first gas inlet 22A is explicitly shown in FIGF 4. Further, the base part 12 includes the shell 24, a first horizontal gas channel 28A and a second horizontal gas channel 28B. Three injectors 26A and 26B are arranged in the centre of the shell 24, wherein said centre is the deepest position of the shell 24. The injectors 26A and 26B are arranged in series. Two outer injectors 26A are supplied by the first horizontal gas channel 28A. The first horizontal gas channel 28A includes the first gas inlet 22A. The second horizontal gas channel 28B is arranged above and perpendicular to the first horizontal gas channel 28A. The second horizontal gas channel 28B includes the second gas inlet 22B and supplies an inner injector 26B. The gas channels 28A and 28B are only provided for delivering gas up to the level of the injectors 26A and 26B. External gas supply tubes are connectable to the gas inlets 22A and 22B. The both gas inlets 22A and 22B allow a separate control of the gas supplies for the inner injector 26B on the one hand and the outer injectors 26A on the other hand. The heat distribution above the gas burner assembly 10 may be adjusted.
The intermediate part 14 is arranged above the base part 12. Three vertical Venturi pipes 30 are formed in the centre of said intermediate part 14, wherein each vertical Venturi pipe 30 is arranged above one of the injectors 26A and 26B. The burner crown 16 is arranged above the intermediate part 14. The prechamber 32 is formed between the intermediate part 14 and the burner crown 16. The height of said prechamber 32 increases radially, from inside to outside. The burner crown 16 includes the inner central chamber and the outer annular chamber connected to the prechamber 32. The burner crown 16 includes the plurality of inner and outer flame ports 40. The inner central chamber 34 is covered by the inner burner cap 20, while the outer annular chamber 36 is covered by the outer burner cap 18 formed as circular ring. The outer burner cap 18 and the inner burner cap 20 are arranged concentrically to each other. Preferably, the outer burner cap 18 and the inner burner cap 20 are arranged at the same level.
FIG 5 illustrates a schematic perspective view of a base part 12 for the gas burner assembly 10 according to the third embodiment of the present invention.
The injectors 26A and 26B are arranged in the centre of the shell 24. The centre is the deepest position of the shell 24. The gas inlets 22A and 22B are arranged in the lower portion of the shell 24 and arranged perpendicular to each other. The first gas inlet 22A on the right hand side in FIG 5 supplies the inner injector 26B, while the second gas inlet 22B on the left hand side in FIG 5 supplies the both outer injectors 26A.
Further, the shell 24 of the base part 12 includes pockets 44 in its upper portion for assembling and centring the burner crown 16, the outer burner cap 18 and/or the inner burner cap 20. Moreover, the base part 12 includes screw holes 50 for fastening said base part on the work plate 48.
FIG 6 illustrates a schematic perspective view of the gas burner assembly 10 according to the third embodiment of the present invention.
The horizontal gas channels 28A and 28B with the gas inlets 22A and 22B are arranged in the lower portion of the shell 24. The horizontal gas channels 28A and 28B are arranged perpendicular to each other. The first horizontal gas channel 28A on the right hand side in FIG 6 supplies the inner injector 26B, while the second horizontal gas channel 28B on the left hand side in FIG 6 supplies the both outer injectors 26A. External gas supply tubes are connectable to the gas inlets 22A and 22B of the horizontal gas channels 28A and 28B, respectively. The both horizontal gas channels 28A and 28B allow a separate control of the gas supplies for the inner injector 26B on the one hand and the outer injectors 26A on the other hand. A fine tuning of the heat above the gas burner assembly 10 is possible. Further, the heat distribution above the gas burner assembly 10 may be adjusted.
Although illustrative embodiments of the present invention have been described herein with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those precise embodiments, and that various other changes and modifications may be affected therein by one skilled in the art without departing from the scope of the invention. All such changes and modifications are intended to be included within the scope of the invention as defined by the appended claims.

List of reference numerals

10: gas burner assembly
12: base part
14: intermediate part
16: burner crown
18: outer burner cap
20: inner burner cap
22: gas inlet
22A: first gas inlet
22B: second gas inlet
24: shell
26: injector
26A: outer injector
26B: inner injector
28: horizontal gas channel
28A: first horizontal gas channel
28B: second horizontal gas channel
30: vertical Venturi pipe
32: prechamber
34: inner central chamber
36: outer annular chamber
38: inner flame port
40: outer flame port
42: pin
44: pocket
46: bottom sheet
48: work plate
50: screw hole
52: gas supply tube

Claims

A gas burner assembly (10) for a gas cooking appliance comprising at least one base part (12) wherein:
- the base part (12) includes a shell (24) with an open top side,

- the base part (12) includes and/or supports at least one injector (26; 26A, 26B) arranged in the central and deepest position of the shell (24), and

- the inner side of the shell (24) is formed as a circumferential surface of a truncated cone,

the gas burner assembly (10) comprises an intermediate part (14) arranged above the base part (12), wherein said intermediate part (14) includes a vertical Venturi pipe (30) in its central portion, so that the Venturi pipe (30) is arranged above the injector (26; 26A, 26B),

the gas burner assembly (10) comprises a burner crown (16) arranged above the intermediate part (14), characterized in that the burner crown (16) includes a plurality of flame ports (38, 40),

the burner crown (16) includes an inner central chamber (34) and an outer annular chamber (36), wherein the inner central chamber (34) is covered by an inner burner cap (20) and the outer annular chamber (36) is covered by an outer burner cap (18),

a plurality of outer flame ports (40) is formed in an outer circumferential side wall of the outer annular chamber (36),

wherein the outer burner cap (18) is formed as a circular ring and inclined in radial direction, so that the level of the outer burner cap (18) rises from inside to outside.
The gas burner assembly (10) according to claim 1,
characterised in that
the base part (12) includes at least one gas inlet (22; 22A, 22B) arranged beneath the shell (24), wherein preferably said gas inlet (22; 22A, 22B) is arranged in a lower and/or outer portion of the base part (12).
The gas burner assembly (10) according to claim 2,
characterised in that
the base part (12) includes at least one gas channel (28; 28A, 28B), in particular a horizontal gas channel (28; 28A, 28B), interconnected between the gas inlet (22; 22A, 22B) and the injector (26; 26A, 26B).
The gas burner assembly (10) according to any one of the preceding claims,
characterised in that
the inner side of the shell (24) of the base part (12) is formed as a smooth surface.
The gas burner assembly (10) according to any one of the preceding claims,
characterised in that
one or more pockets (44) are formed in the upper portion of the shell (24) of the base part (12), wherein said pocket (44) is provided for receiving an element of a burner crown (16) .
The gas burner assembly (10) according to any one of the preceding claims,
characterised in that
the base part (12) includes at least one pin (42), in particular at least two or at least three pins (42), for fixing and/or aligning said base part (12) on a bottom (46) of the gas cooking appliance, wherein preferably said pin (42) extends downwards.
The gas burner assembly (10) according to any one of the claims 1 to 5,
characterised in that
the shell (24) of the base part (12) is formed as an integrated part of a work plate (48) of the gas cooking appliance, wherein preferably the shell (24) of the base part (12) is embossed in the work plate (48) of the gas cooking appliance.
The gas burner assembly according to any one of the preceding claims,
characterised in that
wherein a prechamber (32) is formed between the burner crown (16) and the intermediate part (14).
The gas burner assembly according to any of the preceding claims,
characterised in that
a plurality of inner flame ports (38) is formed in a circumferential side wall of the inner central chamber (34), wherein preferably the inner burner cap (20) is formed as a circular disk.
The gas burner assembly according to any of the preceding claims,
characterised in that
a further plurality of outer flame ports (40) is formed in an inner circumferential side wall of the outer annular chamber (36) .
The gas burner assembly according to any of the claims 7 to 10,
characterised in that
an upper side of the base part (12) is open, so that the gas burner assembly takes primary fresh air from outside of the work plate (48).
A gas cooking appliance, in particular a domestic gas cooking hob, comprising at least one gas burner assembly (10) according to any one of the preceding claims.