Gas burner, gas burner arrangement and gas stove

Abstract

A gas burner, comprising: gas outlet openings arranged in a ring for providing flames directed towards an interior of the ring; and at least one lower secondary air outlet located below the gas outlet openings for providing secondary air along an interior side of the flames.

Claims

1-14. (canceled)

15. A gas burner, comprising a gas burner body designed to include a ring of gas outlet openings for providing flames directed towards an interior of the gas burner body, and to include a lower secondary air outlet located below the ring of gas outlet openings for providing secondary air along an interior side of the flames.

16. The gas burner according to claim 15, wherein the gas burner body comprises an upper secondary air outlet located above the ring of gas outlet openings for providing secondary air along an exterior side of the flames, the exterior side of the flames being a side that is facing the ring of gas outlet openings.

17. The gas burner according to claim 16, further comprising a plurality of said lower secondary air outlet and/or a plurality of said upper secondary air outlet.

18. The gas burner according to claim 17, wherein the plurality of lower secondary air outlets and/or the plurality of upper secondary air outlets are arranged evenly along a circumference of the gas burner body.

19. The gas burner according to claim 16, wherein at least one of the lower secondary air outlet and the upper secondary air outlet is formed as a through-hole in the gas burner body, with the through-hole being fluidly connected with an exterior of the gas burner.

20. The gas burner according to claim 19, wherein the through-hole is fluidly connected with a region that is radially around the gas burner body.

21. The gas burner according to claim 15, wherein a member selected from the group consisting of the ring of gas outlet openings, the lower secondary air outlet and the upper secondary air outlet faces the interior of the gas burner body.

22. The gas burner according to claim 15, wherein the gas burner body comprises a lower secondary air channel which extends along a radial direction from an exterior of the gas burner to the lower secondary air outlet below the ring of gas outlet openings, the lower secondary air channel being configured to guide secondary air from the exterior of the gas burner to the lower secondary air outlet.

23. The gas burner according to claim 16, further comprising a shield element extending above the ring of gas outlet openings and having a ring shape with a radius that is equal to or larger than a radius of the ring of gas outlet openings, said upper secondary air outlet being formed as an opening in the shield element located above the ring of gas outlet openings.

24. The gas burner according to claim 23, wherein the shield element is integrally formed with the gas burner body.

25. The gas burner according to claim 15, wherein the gas burner body comprises a pot support configured to hold a cooking pot.

26. The gas burner according to claim 23, wherein the shield element comprises a further opening located below the ring of gas outlet openings, said lower secondary air outlet being formed or connected to the further opening in the shield element.

27. The gas burner according to claim 23, wherein the shield element comprises a combustion opening located above the upper secondary air outlet for ejecting combustion products from a combustion of gas.

28. The gas burner according to claim 16, wherein the lower secondary air outlet has a height between 1 and 20 mm and/or the upper secondary air outlet has a height between 1 and 20 mm.

29. A gas burner arrangement, comprising: a gas burner comprising a gas burner body designed to include a ring of gas outlet openings for providing flames directed towards an interior of the gas burner body, said gas burner body including a lower secondary air outlet located below the ring of gas outlet openings for providing secondary air along an interior side of the gas burner body, and an upper secondary air outlet located above the ring of gas outlet openings for providing secondary air along an exterior side of the flames; and a plate having an upper surface on which the gas burner is mounted, wherein at least one of the lower secondary air outlet and the upper secondary air outlet is arranged above the upper surface of the plate.

30. The gas burner arrangement of claim 29, constructed in a form of a gas stove.

31. A gas stove, comprising: a gas burner comprising a gas burner body designed to include a ring of gas outlet openings for providing flames directed towards an interior of the gas burner body, and to include a lower secondary air outlet located below the ring of gas outlet openings for providing secondary air along an interior side of the gas burner body, or the gas burner arrangement according to claim 29.

Description

[0053] Further embodiments, features and advantages of the present invention will become apparent from the subsequent description and dependent claims, taken in conjunction with the accompanying drawings, in which:

[0054] FIG. 1 shows a side view of a gas stove;

[0055] FIG. 2 shows a side view of a gas burner arrangement for the gas stove of FIG. 1;

[0056] FIG. 3 shows a perspective view of a gas burner according to a first embodiment;

[0057] FIG. 4 shows a cross-sectional view V-V from FIG. 3;

[0058] FIG. 5 shows a perspective view of a gas burner according to a second embodiment;

[0059] FIG. 6 shows a cross-sectional view W-W from FIG. 5;

[0060] FIG. 7 shows a front view of FIG. 6; and

[0061] FIG. 8 shows a cross-sectional view X-X from FIG. 6.

[0062] In the Figures, like reference numerals designate like or functionally equivalent elements, unless otherwise indicated.

[0063] FIG. 1 shows schematically a side view of a gas stove 1. The gas stove 1 comprises a plate 2, in particular a top sheet. The plate 2 is made of glass or glass ceramics. The gas stove 1 further comprises gas burners 3 and 4. The burners 3 are arranged on the plate 2. The gas burners 3, 4 are configured to heat cookware. Each gas burner 3, 4 and the plate 2 form a gas burner arrangement 5.

[0064] FIG. 2 shows schematically the gas burner arrangement 5 from FIG. 1. The plate 2 comprises an upper surface 6. The plate 2 further comprises an insertion opening 8. The gas burner 3 is mounted on the upper surface 6 of the plate 2. Further, the gas burner 3 comprises a circular portion 9 which is inserted into the insertion opening 8. The circular portion 9 is adapted to the insertion opening 8 such that a form fit is provided between the gas burner 3 and the plate 2. A diameter D of the insertion opening 8 is preferably between 80 and 110 mm, 90 and 92 mm or exactly 90.9 mm. An outer contour 7 of the circular portion 9 is adapted to the diameter D.

[0065] FIG. 3 shows a perspective view of a gas burner 3 according to a first embodiment. The gas burner 3 includes a gas burner body 16 having a ring shape. On an interior side of the burner body 16, which faces an interior 12 of the gas burner 3, a ring 11 of gas outlet openings 10 is formed. The gas outlet openings 10 are for providing circularly arranged inner flames 14. The ring 11 is a circular ring when looking from above.

[0066] The gas outlet openings 10 are arranged such that the flames 14 are directed towards the interior 12 of the ring 11. As shown in FIG. 3, the flames 14 are directed radially inwards RI at the gas outlet opening 10. FIG. 3 only shows one flame 14 but all other gas outlet openings 10 are configured to provide a similar flame 14 directed inwards.

[0067] Below the gas outlet openings 10, the burner body 16 comprises eight lower secondary air outlets 15, which have rectangular cross sections. The lower secondary air outlets 15 are arranged evenly around the circumference of the burner body 16. A height H1 of the lower secondary air outlets 15 (along an axial direction A) is between 2 and 15 mm. The lower secondary air outlets 15 are arranged such as to face the interior 12 of the gas burner 3. The lower secondary air outlets 15 are located below the gas outlet openings 10.

[0068] The lower secondary air outlets 15 are connected to respective lower exterior openings 24 in the burner body 16 by means of through holes 18 (lower secondary air channel). The through holes 18 connect the interior 12 of the gas burner 3 with the exterior 13 thereof. Secondary air enters the lower exterior openings 24, passes through the through holes 18 and exits the burner body 16 on an interior side thereof through the lower secondary air outlets 15.

[0069] FIG. 4 shows a cross-sectional view V-V from FIG. 3. FIG. 4 shows the flow of secondary air 17 leaving the lower secondary air outlets 15. Namely, the secondary air 17 leaves the lower secondary air outlet 15 horizontally or nearly horizontally radially inwards RI. The secondary air 17 is then deflected upwards. The secondary air 17 follows the direction of the flame 14, wherein the secondary air 17 always flows along an interior side 19 of the flame 14, which is located towards the interior 12. In the example of FIGS. 3 and 4, no secondary air is provided on an exterior side 20 of the flame 14, which is located towards the exterior 13.

[0070] FIG. 5 shows a perspective view of a gas burner 4 according to a second embodiment. FIG. 6 shows a cross-sectional view W-W from FIG. 5. FIG. 7 shows a front view of FIG. 6. FIG. 8 shows a cross-sectional view X-X from FIG. 6.

[0071] FIG. 5 to 8 will be described jointly in the following. The gas burner 4 mostly resembles the gas burner 3 described previously, so that identical elements will not be described again and that we will focus on differences in the following.

[0072] The gas burner 4 has an inclined portion 31 which is ring-shaped and on which the gas outlet openings 10 are arranged. The gas outlet openings 10 are directed partly radially inwards RI, partly upwards along the axial direction A. The burner body 16 of FIG. 5-8 has a slightly more complex shape than that of FIGS. 3 and 4. The burner body 16 of FIG. 5-8 has a circular ring shape and is integrally formed. An upper surface 32 of the burner body is also slightly inclined inwards.

[0073] The upper surface 32 has four pot supports 28 formed integrally therewith. The pot supports 28 are portions of the burner body 16 protruding upwards from the upper surface 32. The vertical height H3 of the pot supports 28 from the upper surface 32 is between 5 and 15 mm. The pot supports 28 are arranged evenly along the circumference of the gas burner 4.

[0074] Within the burner body 16, a venturi tube 29 is provided to mix the gas and the primary air 30 to obtain a combustible mixture, which is lead to the gas outlet openings 10 to generate flames 14. The primary air 30 enters the burner body 16 from below.

[0075] In FIG. 5-8, there are only four lower secondary air outlets 15. These are formed between legs 26 protruding downwards from a lower surface 35 of the burner body 16. In other words, the lower secondary air outlets 15 and the through-holes 18 are formed between recessed portions of the lower surface 35 of the burner body 16 and the plate 2.

[0076] In addition to the four lower secondary air outlets 15, the burner body 16 of FIG. 5-8 includes four upper secondary air outlets 21. The upper secondary air outlets 21 have substantially rectangular cross sections. The upper secondary air outlets 21 are arranged evenly around the circumference of the burner body 16. A height H2 of the upper secondary air outlets 21 (along an axial direction A) is between 2 and 15 mm. The upper secondary air outlets 21 are arranged such as to face the interior 12 of the gas burner 3. The upper secondary air outlets 21 are located above the gas outlet openings 10.

[0077] The upper secondary air outlets 21 are connected to respective upper exterior openings 25 in the burner body 16 by means of through holes 22. The through holes 22 connect the interior 12 of the gas burner 4 with the exterior 13 thereof. Secondary air 23 enters the upper exterior openings 25, passes through the through holes 22 and exits the burner body 16 on an interior side thereof through the upper secondary air outlets 21.

[0078] FIG. 8 shows the flow of secondary air 17, 23 leaving the lower secondary air outlets 15 (identical to the flow of secondary air 17 described in view of FIG. 4) and the upper secondary air outlets 21. Namely, the secondary air 23 leaves the upper secondary air outlet 21 horizontally or nearly horizontally radially inwards RI. The secondary air 23 is then deflected upwards. The secondary air 23 follows the direction of the flame 14, wherein the secondary air 23 always flows along the exterior side 20 of the flame 14, which is located towards the exterior 13. The secondary air 17, 23 ensures a good combustion and that the flame is maintained.

[0079] When a pot is placed on the pot supports 28, a vertical combustion opening 33 is formed between the upper surface 32 of the burner body 16 and the pot. The combustion opening 33 allows evacuating combustion products 34 in a horizontal direction (radially outwards).

[0080] In the figures described above, the burner body 16 or at least part thereof can be considered as a shield element 27. In detail, the shield element 27 is a portion of the burner body 16 that extends above the gas outlet openings 10 in which the upper secondary air outlets 21 are located. In FIG. 3-8, the shield element 27 is an integral part of the burner body 16.

[0081] However, in other embodiments (not shown), the shield element 27 can be an element that is separate from the burner body 16. Such a shield element 27 can have a cylindrical shape and be placed around the burner body 16, preferably concentrically to the burner body 16. Such a shield element 27 can be added to an existing gas burner 3, 4. The shield element can include the upper secondary air outlets 21 and/or the lower secondary air outlets 15.

[0082] Although the present invention has been described in accordance with preferred embodiments, it is obvious for the person skilled in the art that modifications are possible in all embodiments.

REFERENCE NUMERALS

[0083] 1 gas stove [0084] 2 plate [0085] 3, 4 gas burner [0086] 5 gas burner arrangement [0087] 6 upper surface [0088] 7 outer contour [0089] 8 insertion opening [0090] 9 circular portion [0091] 10 gas outlet opening [0092] 11 ring [0093] 12 interior [0094] 13 exterior [0095] 14 flame [0096] 15 lower secondary air outlet [0097] 16 gas burner body [0098] 17 secondary air [0099] 18 through-hole [0100] 19 interior side of the flame [0101] 20 exterior side of the flame [0102] 21 upper secondary air outlet [0103] 22 through-hole [0104] 23 secondary air [0105] 24 lower exterior opening [0106] 25 upper exterior opening [0107] 26 leg [0108] 27 shield element [0109] 28 pot support [0110] 29 venturi tube [0111] 30 primary air [0112] 31 inclined portion [0113] 32 upper surface [0114] 33 combustion opening [0115] 34 combustion product [0116] 35 lower surface [0117] A axial direction [0118] D diameter [0119] H1 height [0120] H2 height [0121] H3 height [0122] RI radially inwards