Improved Gas Burner

Abstract

A gas burner (2) for a stove (90), preferably suitable for mounting on a built-in stove, comprising an injector holder (6), a base (4) that can be placed on said injector holder (6), and at least one lid (8) that can be placed on said base (4), said at least one lid (8), said base (4) and said injector holder (6) being superimposed along a Z-direction, said base (4) comprising an inner chamber (10) for mixing and / or distributing a mixture of air and gas and supplying it to a first flame ring (12) and an outer annular chamber (12) for mixing and / or distributing a mixture of air and gas and supplying it to a second flame crown (22) and / or a third flame crown (24), said at least one lid (8) being configured to close the upper side of said inner chamber (10) and said outer annular chamber (12), and said injector holder (6) being configured to close the upper side of said inner chamber (10) and said outer annular chamber (12), (6) is a central concave element (31') defining therein a corresponding central cavity (32') in which a corresponding central injector (33') is mounted, said central cavity (32') being in fluid communication with the inner chamber (10) of the base (4), and two lateral concave elements (31'', 31''') defining respective lateral cavities (32'', 32''') on their respective interior sides. two lateral concave elements (31'', 31''') each having a corresponding lateral injector (33'', 33''') mounted thereon, said lateral cavities (32'', 32''') being in fluid communication with said outer annular chamber (20) of said base (4); the central cavity (32') is disposed between the two side cavities (32'', 32'''), the three cavities (32', 32'', 32''') are disposed side by side along an X direction, the injector holder (6) has a substantially elongated shape along the X direction, an extension of the injector holder (6) along the X direction is different from and greater than an extension of the injector holder (6) along a Y direction, the X direction and the Y direction are perpendicular to each other and extend in a Z direction. and each of said two lateral concave elements (31'', 31''') respectively comprises at least one opening (50'', 50''') for the entry of primary air (17) into the corresponding lateral cavity (32'', 32''') at least from below the cooking surface (90) or only from below said cooking surface, and wherein the extension of said injector holder (6) along said Y-direction is substantially no more than about 1 / 3 of the extension of said injector holder itself along said X-direction.

Description

[Technical field]

[0001] The present invention relates to a gas burner to be mounted on a hob, preferably a built-in hob.Furthermore, the present invention relates to an injector holder for a gas burner to be mounted on a gas hob, preferably a built-in gas hob. [Background technology]

[0002] Known burners having multiple flame rings, also known as "multi-ring" burners, generally comprise an injector holder, a base disposed on the injector holder, and at least one cover disposed on the base and defining a mixing and distribution chamber for the air and gas mixture.

[0003] The injector holder is typically made of die cast aluminum and includes a means for fastening to the stove. Two or more injectors, typically with vertical axes, are mounted to the bottom of the injector holder and are fluidly connected to the gas supply inlets.

[0004] The base is also made of die-cast aluminum and is equipped with two or more vertical axis ducts, each of which is coaxial and faces a corresponding injector mounted in an injector holder.

[0005] The base is further configured to define an inner central distribution chamber and an outer annular distribution chamber, the outer annular distribution chamber being disposed on an outer periphery of the inner central distribution chamber and separated from the inner central distribution chamber by a substantially annular cavity, the first vertical duct opening into the inner central distribution chamber and at least one other vertical duct opening into the outer annular distribution chamber.

[0006] The base itself also functions as a flame splitter, in particular the edge and / or outer wall of the inner central distribution chamber has a door for escaping the first flame ring, the edge and / or outer wall of the distribution chamber has an outer annular door for escaping the second flame crown, and in some embodiments a door is formed in the edge and / or inner wall of the outer annular distribution chamber for escaping the third flame ring.

[0007] One or more lids, typically stamped from sheet metal, are positioned over the base to close the inner central dispensing chamber and the outer annular dispensing chamber at the top.

[0008] In particular, in known solutions, the injector holder generally has a central cavity and two lateral cavities. More particularly, in known solutions in which suction is only performed from above the stove, the aforementioned lateral cavities of the injector holder, which are fluidly connected with the outer annular distribution chamber from which the second e / or third flame crown emerges, are closed both at the bottom and at the sides and have particularly large dimensions, much larger than the central cavity, precisely to allow the intake of a sufficient amount of primary air from above the stove to generate an air-gas mixture suitable for supplying the outer distribution chamber and therefore suitable for supplying the second and / or third flame crown.

[0009] Moreover, around the upper edges of the three cavities in which the injectors are mounted, the injector holder extends radially with the enlarged crown, so that the injector holder itself has a substantially circular planar shape, and around the outer periphery of the enlarged crown, a suitable seat or means is provided for fixing the injector holder itself to the stove.

[0010] These known solutions, although appreciated, are not entirely satisfactory, since the injector holders made in this way are particularly wide, particularly heavy and cumbersome, and particularly expensive to make, both in terms of the amount of material required to make them and because only a few pieces (generally only two) can be obtained in a single moulding by die casting.

[0011] Furthermore, the wide width of known injector holders necessarily imposes constraints on their installation on the stove / cooking appliance, which necessarily prevents their use on stoves and cooking appliances with small dimensions or in places with special requirements in terms of obstructions.

[0012] Furthermore, in some known solutions, the edges and inner side walls of the annular distribution chamber have irregular shapes, which results in the burner having a particular, unconventional and not always pleasing aesthetic appearance. Moreover, these solutions do not allow the use of conventional, inexpensive closing lids with a regular annular shape to close the top of a chamber with an irregular internal shape. Summary of the Invention

[0013] The object of the invention is to propose a gas burner to be installed on a hob, which overcomes at least partially the drawbacks of the previous solutions.

[0014] Another object of the invention is to propose a gas burner which has a high heat output while having an injector holder of particularly compact dimensions, in particular in width.

[0015] Another object of the invention is to propose a gas burner which can be assembled and disassembled extremely simply, quickly and safely.

[0016] Another object of the invention is to propose a gas burner which can be assembled and disassembled extremely simply, quickly and safely over time and with the inevitable accumulation of dirt after use.

[0017] Another object of the invention is to propose a gas burner which has a particularly pleasing overall aesthetic effect.

[0018] Another object of the invention is to propose a gas burner with a reduced number of components.

[0019] Another object of the invention is to propose a gas burner which can be obtained at extremely low manufacturing costs.

[0020] Another object of the invention is to propose a gas burner which can be mass-produced quickly and efficiently.

[0021] Another object of the invention is to propose a gas burner having alternative and / or improved characteristics with respect to the prior art, both from a structural and functional point of view.

[0022] Another object of the invention is to propose a gas burner which meets high standards, both functionally and aesthetically, and which is at the same time affordable and therefore has the potential for widespread use on a large scale.

[0023] Another object of the invention is to propose a gas burner of simple construction and low cost.

[0024] Another object of the invention is to propose an injector holder which is more compact and less expensive than those of the prior art.

[0025] Another object of the invention is to propose an injector holder that is lighter and / or has a smaller footprint than conventional ones.

[0026] Another object of the invention is to propose an injector holder which can be manufactured simply, quickly and at limited cost.

[0027] Another object of the invention is to propose a gas burner or injector holder which can be easily installed on stoves or cookware of small dimensions, or generally where there are problems or special requirements in terms of dimensions.

[0028] All these objects, either alone or in any combination thereof, as well as other objects that will become apparent from the following description, are achieved according to the present invention through a gas burner having the features of claim 1 or an injector holder having the features of claim 12. [Brief description of the drawings]

[0029] The invention will be further defined below in some of its preferred embodiments, given purely for illustrative but non-limiting purposes, with reference to the enclosed drawings, in which:

[0030] [Figure 1A] FIG. 1 is an exploded perspective view of a burner according to the present invention; [Figure 1B] FIG. 1B is a view of the burner of FIG. 1A in the assembled state, cut along a vertical cross-sectional plane passing through all three cavities of the nozzle holder along its longest extension direction. [Figure 1C] 1B is a view of the burner of FIG. 1A in an assembled state, cut along a vertical cross-sectional plane perpendicular to that of FIG. 1B and intersecting only the central cavity of the injector holder along the short extension direction of the injector holder itself; [Figure 2A] FIG. 1B is a top perspective view of only the injector holder according to the present invention used in the burner of FIG. 1A. [Figure 2B] FIG. 2B is a bottom perspective view of the injector holder of FIG. 2A. [Figure 3A] FIG. 1B is a top perspective view of only the base of the burner of FIG. [Figure 3B] FIG. 3B is a bottom perspective view of the base of FIG. 3A. [Figure 4] FIG. 2B is a plan view of a cooktop equipped with the injector holder of FIGS. 1A and 2A. [Diagram 5]FIG. 1B is a plan view of the burner of FIG. 1A. [Figure 6] FIG. 1B is a plan view of the burner of FIG. 1A, also showing the flame crown. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] As can be seen, the gas burner 2 according to the invention comprises a base 4 which can be placed on an injector holder 6 and at least one lid 8 which can be placed on the base 4 .

[0032] Advantageously, the gas burner 2 is of a type suitable for mounting on a hob 90, preferably a built-in hob. Advantageously, the burner 2 is suitable for heating frying pans or generally cooking utensils (e.g. dishes, grills, grill pans, saucepans, etc.).

[0033] Preferably, for example in the embodiment shown, the base 4 acts as a flame splitter. Advantageously, in other possible embodiments (not shown here), the splitting of the flame can be effected by the cover 8 alone or by both the base 4 and the corresponding cover 8.

[0034] Advantageously, said burner 2 consists only of a base 4, an injector holder 6 and at least one lid 8, preferably two lids 8' and 8''.

[0035] The injector holder 6 has an elongated shape. More specifically, an "elongated" shape means that the extension / progression along the X direction (i.e. length direction) is different from and larger than the extension / progression along the Y direction (i.e. width direction) perpendicular to the X direction, and further, the X and Y directions together are perpendicular to the Z direction completing a three-dimensional direction of the Cartesian coordinate system and also corresponding to the arrangement and overlapping direction of the base 4 on the injector holder 6 and the lid 8 on the base 4. In particular, in other words, the lid 8, the base 4 and the injector holder 6 overlap each other along the Z direction. Advantageously, the Z direction corresponds substantially to the vertical direction.

[0036] The extension of the injector holder 6 along the X direction is much larger than the extension along the Y direction, and in particular, the extension of the injector holder 6 along the Y direction is approximately 1 / 3 or less of the extension of the injector holder itself along the X direction.

[0037] Preferably, the maximum extension (understood as the distance between the opposing edges defining the respective cavity) of at least one of the three cavities 32', 32'', 32''' along the Y direction is less than or equal to approximately 1 / 3 of the distance between the outermost edges of the two lateral cavities 32'' and 32'''' along the X direction.

[0038] The base 4 rests on the injector holder 6. an inner chamber 10 for mixing and / or distributing a mixture of air and gas thereby supplying a first flame ring 12; an outer annular chamber 20 for mixing and / or distributing the air and gas mixture, thereby providing a second flame crown 22 and / or a third flame crown 24; Equipped with.

[0039] Advantageously, the base 4 is made in one piece.

[0040] As mentioned above, the burner 2 comprises at least one lid 8 for closing said inner chamber 10 and said outer annular chamber 12. Preferably, said at least one lid 8 is pressed from sheet metal. Preferably, the lid 8 is entirely enameled or at least its upper surface is intended to be visible.

[0041] Advantageously, the outer annular chamber 20 is separated from the inner chamber 10 (preferably located in the center of the base 4) by an inner recessed area 13 having a substantially annular development. Suitably, furthermore, the outer annular chamber 20 and the inner chamber 10 are interconnected by a radial portion 14 that crosses the inner recessed zone 13. Preferably, the radial connecting portion 14 may be provided at the bottom of the inner recessed zone 13.

[0042] Preferably, in the possible embodiments depicted in the figures, the outer annular chamber 20 and chamber 10 are not in fluid communication with each other, however, in some possible embodiments not shown here, there may be a radial flow passage across the interior recessed region 13 to fluidly connect the outer annular chamber 20 and chamber 10.

[0043] Advantageously, the inner chamber 10 is provided with a first door 11 for the exit of the first flame ring 12. In particular, the first door 11 is formed on a cylindrical wall 15 that laterally and externally bounds the inner chamber 10, and preferably corresponds to the upper edge of said cylindrical wall 15.

[0044] Preferably, the outer annular chamber 20 is provided with a second door 21 for the outlet of the second flame ring 22. In particular, the second door 21 is formed in an outer side wall 25 which externally defines the outer annular chamber, and preferably corresponds to an outer upper edge of said outer side wall 25.

[0045] Preferably, the outer annular chamber 20 is provided with a third door 23 for escaping the third flame ring 24. In particular, the third door 23 is formed in an inner side wall 26 that defines the outer annular chamber on the inside, and preferably corresponds to an outer upper edge of said inner side wall 26.

[0046] Advantageously, the flame of the first flame crown 12 emerges in the recessed region 13 and is directed outwardly, while the flame of the third flame crown 24 emerges in the recessed region 13 and is directed inwardly.

[0047] Preferably, the burner 2 comprises two lids, in particular a circular first lid 8 ′ for closing the inner chamber 10 and an annular second lid 8 ″ for closing the outer annular chamber 20 .

[0048] Preferably, in a possible embodiment not shown here, the burner 2 may comprise a single lid having an inner circular part for closing the inner chamber 10 and an outer annular part for closing the outer annular chamber 20, further, the inner circular part and the outer annular part being connected to each other by a radial part.

[0049] Advantageously, and more particularly, the inner chamber 10 is bounded laterally by a cylindrical wall 15, at the bottom by a bottom surface, whilst at the top it is bounded and closed by a first lid 8' (i.e. the central part of the single lid 8).

[0050] Advantageously, the first gate 11 is defined in the upper edge of the cylindrical wall 15 .

[0051] Conveniently, the first door 11 may be provided with a first primary slot / hole and a first secondary slot / hole, each having a different shape and / or size.

[0052] Advantageously, in some possible embodiments, the first door 11 comprises a main or secondary recess, which is obtained on the base 4 and is open on the upper side to be closed by the lid 8. Advantageously, in some possible embodiments, the first door 11 can be closed on all sides in the passage section and include a small through hole only obtained entirely on the base 4, or closed on all sides in the passage section and include a small through hole only obtained entirely on the lid 8.

[0053] Preferably, also appearing inside the inner chamber 10 is the upper section (preferably of an upwardly converging frusto-conical shape) of a central duct 40' of the base 4, as will be explained in more detail below.

[0054] Advantageously, and more particularly, the outer annular chamber 20 is defined laterally between an outer side wall 25 and an inner side wall 26, at the bottom by a bottom surface joining the two aforementioned walls 25 and 26, while at the top it is defined and closed by a second lid 8'' (i.e. from the outer annular part of the single lid 8). Preferably, inside the outer annular chamber 20 also protrude the upper parts of two respective lateral ducts 40'' and 40''' of the base 4 (preferably each having an upwardly converging frustoconical shape), which will be explained in more detail below.

[0055] Advantageously, the second door 21 is defined in an upper edge of the outer side wall 25 of the base 4. Advantageously, the second door 21 may be provided with respective second primary slots / holes 21 and second secondary slots / holes 21 that are different in shape and / or size.

[0056] Preferably, the third port 23 is defined in an upper edge of the inner side wall 26 of the base 4. Preferably, the third port 23 may comprise a respective third primary slot / hole 23 and a third secondary slot / hole 23 that are different in shape and / or size.

[0057] Preferably, in some possible embodiments, the second door 21 and / or the third door 23 may comprise a main or secondary slot, which is obtained on the base 4 and is open on the upper side and is therefore closed by the lid 8. Preferably, in some possible embodiments, the second door 21 and / or the third door 23 may comprise a small through-hole, closed on all sides, of a passage section formed entirely only on the base 4, or a small through-hole, closed on all sides, of a passage section formed entirely only on the cover 8.

[0058] Advantageously, the first door 11, the second door 21 and / or the third door 23 may have the same or different shapes and / or dimensions.

[0059] Preferably, the extension of the injector holder 6 along the X direction substantially corresponds to the diameter of the base 4, while the extension of the injector holder 6 along the Y direction is smaller than the diameter of the base 4. More preferably, the extension of the injector holder 6 along the Y direction is equal to or smaller than half the diameter of the base 4 in plan view (particularly, substantially corresponds to the diameter of the outer side wall 25). More preferably, the extension of the injector holder 6 along the Y direction is equal to or smaller than about ⅓ of the plan diameter of the base 4 (particularly, substantially corresponds to the diameter of the outer side wall 25).

[0060] The injector holder 6 is configured and intended to be applied to at least one through opening intended to be provided in the cooktop 90. Advantageously, the injector holder 6 is intended to be fixed to the cooktop 90, preferably to a built-in cooktop.

[0061] Preferably, the injector holder 6 is configured to fit closely from below to the sheet metal of the cooktop 90 around the at least one through opening formed in the cooktop 90 .

[0062] The injector holder 6 comprises three concave elements, 31', 31'' and 31''', each defining a corresponding cavity therein, 32', 32'' and 32''', respectively, for corresponding injectors, 33', 33'' and 33''', respectively. Advantageously, the injector holder 6 is made in one piece.

[0063] In particular, the injector holder 6 is a central concave element 31' defining therein a corresponding central cavity 32' in which a corresponding central injector 33' is mounted; two lateral concave elements 31'' and 31''', which define therein lateral cavities 32'' and 32''', respectively, in which corresponding lateral injectors 33'' and 33''', respectively, are mounted; Equipped with.

[0064] Preferably, the three concave elements 31', 31'' and 31'' are substantially well- or cup-like shaped.

[0065] Advantageously, the three concave elements 31 ′, 31 ″ and 31 ″′ are connected bottom to bottom by corresponding connections 38 .

[0066] Advantageously, the central injector 33' is located between the lateral injectors 33'' and 33'''.

[0067] Advantageously, the three injectors 33', 33'' and 33''' have a substantially vertical extension (i.e. along the Z direction), in particular the extension axis of each injector 33', 33'' and 33''' is aligned along the Z direction.

[0068] Preferably, the axes of the three injectors 33', 33'' and 33'' are parallel to each other.

[0069] Preferably, the axes of the three injectors 33', 33'' and 33'' are aligned along the X direction.

[0070] Preferably, the three injectors 33', 33'' and 33''' may be mounted within their respective cavities such that they are aligned along the X direction but all have substantially the same height / dimension along the Z direction. Advantageously, in a possible embodiment not shown, the central injector 33' may be mounted with a height / dimension along the Z direction which is different (e.g. higher or lower) than the height / dimension of the two lateral injectors 33'' and 33'''', which are rather the same height / dimension.

[0071] Advantageously, the three injectors 33', 33" and 33''' are mounted in corresponding cavities 32', 32" and 32''', in particular in the bottom wall of the corresponding cavity. Advantageously, in the bottom wall of each cavity 32', 32" and 32''' of the injector holder 6 is mounted, preferably screwed, a corresponding injector 33', 33" and 33''' having a vertical extension.

[0072] The injector holder 6 comprises only one gas inlet 30 in fluid communication with all three injectors 33', 33'', and 33'''. Preferably, the gas inlet 30 is intended to be associated with a standard single outlet valve (not shown). In particular, the burner 2 is therefore of the "multi-ring" type, with all flame crowns 12, 22 and / or 24 being supplied from a single gas source and all being regulated in the same manner and in one piece. More particularly, the burner 2, and in particular its injector holder 6, is not of the "dual" type, since it is provided with a single gas inlet 30, and in particular does not have two gas inlets controlled by a "dual" valve or corresponding two valves.

[0073] Advantageously, the injector holder 6 comprises therein a gas supply conduit 34 fluidly connected to the single gas inlet 30 and to the three injectors 33', 33'', and 33'''. Advantageously, the supply duct 34' extends longitudinally substantially along the deployment direction X of the injector holder 6. Preferably, the supply duct 34 is arranged below the bottom wall of each of the three cavities 32', 32'', and 32'''. Preferably, the supply duct 34 extends horizontally or substantially horizontally at the bottom of the injector holder 6. Preferably, the supply duct 34 opens at one end at the gas inlet 30 and communicates with the three injectors 33', 33'', and 33'''. Preferably, the supply duct 34 has a constant or slightly convergent cross section along its longitudinal deployment.

[0074] Advantageously, the three cavities 32', 32'' and 32''', from which gas emerges from each injector 33', 33'' and 33''', are fluidly isolated from one another. In other words, the injector holder 6 is configured such that downstream of each injector 33', 33'', and 33''', gas emerging from each injector into the corresponding cavity in which the injector itself is housed does not mix with and / or is not in fluid communication with gas emerging into the other two cavities. Advantageously, downstream of each injector 33', 33'' and 33''', in the injector holder 6, there are no ducts or fluid communication between the central cavity 32' and the lateral cavities 32'' and 32''', and vice versa. Preferably, downstream of each injector 33', 33'', and 33''', the three cavities 32', 32'', and 32''' are spaced apart, in particular between the central cavity 32' and each of the two lateral cavities 32'', and 32'''. Advantageously, downstream of each injector 33', 33'', and 33''', the walls defining said three cavities 32', 32'', and 32''' are separate from each other, and further, said walls are not shared between the central cavity 32' and the lateral cavities 32'', and 32'''. Advantageously, this allows for well separated primary air flows for each of the three cavities, thereby preventing the respective injectors 33', 33'', and 33''' from rubbing against each other. Essentially, this avoids fluid interference between the injectors 33', 33'' and 33''' and between the primary air flows recalled by the three injectors 33', 33'' and 33''' in their respective cavities 32', 32'' and 32''''.

[0075] Preferably, there are spacer walls 49 between the wall of the central cavity 32' and the walls of each of the two lateral cavities 32'' and 32'''. Advantageously, the spacer walls 49 extend along the X and Y axes.

[0076] Advantageously, the three cavities 32', 32'' and 32''' are arranged substantially side-by-side along the X direction, and in particular, the central cavity 32' is interposed between the two lateral cavities 32'' and 32'''.

[0077] Advantageously, the axes of the three injectors 33', 33'' and 33''' are parallel to one another and point along corresponding parallel Z directions.

[0078] Preferably, the injector holder 6 is configured such that when the base 4 is placed on the injector holder 6, the latter is substantially contained within the maximum overall planar dimension of the base itself, i.e. does not substantially protrude relative to the overall dimension in the outermost planar dimension (defined by substantially the outer side wall 25) of said base 4.

[0079] Advantageously, in some possible embodiments, the outer annular chamber 20 may comprise two sectors 20' and 20'' fluidically separated from each other by two passages 27 formed diametrically opposite on the base 4. Preferably, the two passages 27 are mutually aligned along the Y direction. Preferably, the two sectors 20' and 20'' are mutually symmetrical.

[0080] Advantageously, the passage 27 defines a corresponding flow path for transmitting the flame from the second crown 22 to the third crown 24 and / or the first crown 12 (if an ignition plug is positioned corresponding to the outer side wall 25, not shown), or vice versa (if an ignition plug 9 is positioned corresponding to the cylindrical wall 15 or is positioned within the internal recessed region 13).

[0081] Advantageously, the two diametrically opposed passages 27 facilitate the step of molding the base 4 and in particular facilitate the removal of the base 4 from the mould.

[0082] Advantageously, in some possible embodiments, in addition to or instead of the passage 27 obtained on the base 4, holes can be provided on the outer annular cover for transmitting the flame from the second outer crown to the first crown and / or the third crown or vice versa, depending on the position of the spark plug 45.

[0083] Advantageously, in some possible embodiments not shown here, a single passage 27 may be provided, and the outer annular chamber 20 therefore comprises only a single annular sector that is blocked only in correspondence with the passage 27.

[0084] The outer annular chamber 20 is fluidly connected to the two lateral cavities 32 ″ and 32 ″″ of the injector holder 6 , while the inner chamber 10 is in fluid communication with a central cavity 32 ′ of the injector holder 6 .

[0085] The two lateral cavities 32'' and 32''' of the injector holder 6 are configured to draw primary air 17 from below the stove 90. Advantageously, the two lateral cavities 32'' and 32''' of the injector holder 6 can be configured to draw primary air 17 exclusively from below the cooktop 90, or can be configured to draw primary air 17 not only from below the cooktop 90, but also from above the cooktop itself. Advantageously, by drawing air (at least) from below the stove, the two lateral cavities 32'' and 32''' of the injector holder 6 do not require large dimensions to increase the burner output.

[0086] Each lateral concave element 31'' and 31''' is provided with at least one opening 50'' and 50''', respectively, for admitting primary air 17 entering (at least or exclusively) from below the stove 90 into the corresponding lateral cavity 32' and 32''.

[0087] Preferably, each of the two lateral cavities 32'' and 32''' is defined in a corresponding lateral concave element 31'' and 31''', which comprises a bottom wall and / or a side wall which can be partially open or can / may be provided with holes, thereby allowing the primary air 17 to enter the cavity from below (also from below or only from below) the cooktop 90. Preferably, the back wall and / or the side wall are partially open (i.e. have some missing areas), thereby allowing the primary air 17 to enter the cavity from below (also from below or only from below) the cooktop 90.

[0088] Advantageously, as shown in the figure, each of the two lateral cavities 32'' and 32''' has a side wall that is partially open in one or more areas, preferably in two areas opposite each other, thereby allowing primary air 17 to enter the cavity from below the stove 90.

[0089] The central concave element 31' of the injector holder 6 is configured to draw primary air 17 into the central cavity 32' from above the cooking surface 90 and / or from below the cooking surface 90. Advantageously, the central concave element 31' is configured to draw primary air 17 into the central cavity 32' exclusively from above the cooktop 90 or exclusively from below the cooktop 90, or alternatively can be configured to draw primary air 17 into the central cavity 32' from below the cooking surface 90 and also from above the cooking surface itself.

[0090] Advantageously, in the possible embodiment shown in the figures, the central cavity 32' is defined inside a central concave element 31' with completely closed side and bottom walls, thereby allowing primary air 17 to enter the central cavity 32' only from above the cooking surface 90.

[0091] Conveniently, base 4 is a central duct 40' facing the central injector 33' of the injector holder 6 at its bottom and defining therein a central passage 42' opening (preferably externally) into the inner chamber 10; two lateral ducts 40'' and 40''', respectively, each defining a corresponding lateral flow passage 42'' and 42''' therein, which lateral flow passages face downwards towards the respective lateral injectors 33'' and 33'''' of the injector holder 6 and open at the top into the outer annular chamber 20 (preferably externally); Includes.

[0092] Preferably, the central duct 40 ′ extends along the Z direction and at least partially extends downward from the bottom of the base 4 .

[0093] Preferably, each lateral duct 40 ″ and 40 ″′ extends along the Z direction and at least partially extends downward from the bottom of the base 4 .

[0094] Preferably, each of the three ducts 40', 40'' and 40'' of the base 4 has a substantially vertical extension (i.e. along the Z direction) and is coaxial with a corresponding injector having a vertical axis mounted in the injector holder 6.

[0095] Advantageously, in a possible embodiment not shown, the central injector 33' is mounted tilted / angled with respect to the Z direction, and the central duct 40' of the base 4 facing said central injector is also correspondingly tilted / angled 33'.

[0096] Advantageously, in a possible embodiment not shown, the lateral injectors 33'' and 33''' are mounted at an incline / angle with respect to the Z direction, and the respective lateral ducts 40'' and 40' are correspondingly inclined / angled with respect to the base 4 facing the corresponding lateral injectors 33'' and 33'''.

[0097] Advantageously, the two lateral ducts 40'' and 40''' leave the interior of the outer annular chamber 20 in different regions, and preferably each of the two lateral ducts 40'' and 40''' leaves only one of the two sectors 20' and 20'' of the outer annular chamber 20. Preferably, the two lateral ducts 40'' and 40''' lead into the outer annular chamber 20 in respective regions diametrically opposite each other and aligned along the X direction.

[0098] Advantageously, the ducts 40', 40'' and / or 40''' may define a straight venturi passage therein, preferably having a vertical axis.

[0099] Advantageously, the central duct 40' and the inner mixing / distribution chamber 10 are configured to define a radial venturi, i.e. to create a radial venturi effect. Preferably, the lateral ducts 40'' and 40''' and the outer annular mixing / distribution chamber 20 are configured to define a corresponding radial venturi, i.e. to create a radial venturi effect.

[0100] Preferably, the central duct 40' defines a substantially converging (away from the injector) central flow passage 42' therein.

[0101] Preferably, the two lateral ducts 40'' and 40'' define lateral flow paths 42'' and 42'', respectively, having (in a direction away from the injector) a first converging section, a substantially constant or slightly converging second section, and a third diverging section.

[0102] Advantageously, the base 4 and the injector holder 6 are configured such that the base 4 is supported on the injector holder 6 such that the base itself is spaced from the stove 90 to such an extent that a secondary air passage is determined for the first flame crown 12 and / or the third flame crown 24, i.e. the flame appearing within the inner recessed region 13.

[0103] Advantageously, the injector holder 6 comprises means for fixing the injector holder 6 to the stove 90. Preferably, the means for fixing the injector holder 6 to the stove 90 are provided corresponding to said lateral concave elements 31'' and / or 31'''' of the injector holder itself. Advantageously, the two lateral concave elements 31'' and / or 31''' of the injector holder 6 are provided with at least two fins 36 projecting outwards for gluing from below to the stove 90. Advantageously, corresponding to the fins 36, two or more through holes 47 (preferably threaded) are provided, intended for the passage of members 48 (e.g. screws) for fixing the injector holder 6 to the sheet metal of the cooking stove 90. Preferably, the two fins 36 extend radially outwards by or corresponding to a crown 37 wrapping from the outside around the side wall of each concave element 31', 31'' and 31'''.

[0104] Advantageously, the through holes 47 are arranged transversely to the gas supply conduit 34, in particular extending along the Z direction, and the axis intersecting the cross section of the through holes 47 does not intersect the supply conduit 34, thus avoiding (even inadvertently) affecting the integrity of the supply conduit 34 by the operations for obtaining said holes.

[0105] Advantageously, the three concave elements 31', 31'' and 31''' are connected to one another at their bottoms by corresponding connections 38. Preferably, the supply duct 34 traverses the connections 38 associated with the bottoms of the three aforementioned concave elements.

[0106] Advantageously, in a possible embodiment (see FIG. 1C ), the bottom of the base 4 and the injector holder 6 are configured such that, following support of the base on the injector holder 6 , a passage is defined therebetween to allow primary air 17 entering either from above the stove 90 or only from above to enter the central cavity 32 ′ of the injector holder 6 .

[0107] Advantageously, the bottom of the base 4 and the injector holder 6 are configured such that, after the base is placed on the injector holder 6, the lateral cavities 32'' and 32'' are sealed at the top or in any case prevent the primary air 17 coming from above the cooktop 90 from entering into said cavities 32'' and 32'' in any significant way. Advantageously, the contact between the bottom of the base 4 and the lateral concave elements 31'' and 31''' is also such as to prevent the ingress of cooking residues, dirt or liquids coming from above the cooktop (which may undesirably block the corresponding injectors or come into contact with electronic components in or below the application itself (e.g. oven) into the lateral cavities 32'' and 32'''.

[0108] Preferably, in some possible embodiments not shown here, the bottom of the base 4 can be configured such that after it is placed on the injector holder 6, a passage is defined therebetween, allowing primary air 17 also coming from above the stove 90 to enter the lateral cavities 32'' and 32''' of the injector holder 6.

[0109] Advantageously, the side wall of the central concave element 31' is provided with a central support collar 35' for the base 4. Preferably, the central collar 35' extends above a crown 37 which projects outwardly from the side wall of the central concave element 31', thereby fitting snugly against the sheet metal of the cooktop 90 from below.

[0110] Advantageously, each lateral concave element 31'' and 31''' is provided at its upper part with a corresponding lateral collar 35'' and 35''' for resting and supporting the base 4. Preferably, the side walls of each lateral concave element 31'' and 31''' are provided with an outwardly projecting crown 37 for sealingly fitting from below to the sheet metal of the cooktop 90. Furthermore, said side walls extend above the crown 37 and define corresponding collars 35'' and 35''' for supporting and supporting the base 4.

[0111] Advantageously, the lateral collars 35'' and 35''' of the lateral concave supports 31'' and 31''' project above the central collar 35' of the central concave element 31'.

[0112] Advantageously, the extension along the Y direction of each of the two lateral cavities 32'' and 32''' may be substantially equal to or slightly greater or smaller than the extension along the Y direction of the central cavity 32'.

[0113] Advantageously, the extension along the X direction of each of the two lateral cavities 32'' and 32''' may be substantially equal to or slightly greater or smaller than the extension along the X direction of the central cavity 32'.

[0114] Advantageously, the central concave element 31', which is in fluid communication with the inner chamber 10 for supplying the first flame crown 12, draws primary air from above the cooking surface 90 (either from above or only from above) and is therefore substantially unaffected by flow phenomena, and furthermore has dimensions suitable for adequately supplying (i.e. with an air and gas mixture sufficiently rich in primary air) the first flame crown 12 which occupies a minimal proportion of the total burner output (corresponding to approximately 15% to 25%).

[0115] The lateral concave elements 31'' and 31''' of the injector holder 6 are particularly advantageous since they draw in primary air from below the cooking surface 90 and are therefore, despite being small and compact, suitable to adequately supply (i.e. with a sufficiently rich gas-air mixture of primary air) the second flame crown 22 and / or the third flame crown 24, which account for the largest proportion of the total burner power (corresponding to approximately 75% to 85%).

[0116] Advantageously, the base 4 supports the injector holder 6 and is provided with lower means for connecting said base to the injector holder 6 .

[0117] Furthermore, around each lateral duct 40'' and 40''', corresponding abutment sides 43'' and 43''' are provided on the underside of the bottom of the base itself, configured to rest against the entire upper edge of the collars 35'' and 35''' of each lateral concave element 31'' and 31''' of the injector holder 6, thus defining a closure which may be substantially airtight or in any case prevents primary air 17 from above the stove 90 from entering in any significant way into each lateral cavity 32'' and 32'' provided in the injector holder 6.

[0118] Advantageously, the central duct 40' may also be provided with a shaped side surface 43', preferably at substantially the same height as the abutment side surfaces 43'' and 43''' provided around the lateral ducts 40'' and 40''', but since the collars 35'' and 35''' of the lateral supports 31'' and 31''' extend above the central collar 35' of the central concave element 31', contact and closure occurs between the abutment side surfaces 43'' and 43''', which may be substantially airtight or in any case prevent the primary air 17 from above the hob 90 from entering the interior of the lateral cavities 32'' and 32'''' in any significant way due to the primary air from above the hob 90. Meanwhile, the shaped side surface 43' remains spaced apart from the central collar 35' so as to define a passage for the primary air 17 from above the hob 90 to enter the interior of the central cavity 32'. Advantageously, in a possible embodiment, the central collar 35' can be deployed at a height equal to that of the lateral collars 35'' and 35''', thus forming a closure with shaped sides 43' that is substantially airtight or in any case capable of preventing the entry of a large amount of primary air 17 from above the stove 90, while the central concave element 31' is provided with an opening (equal or similar to the opening in the lateral concave elements) for the primary air 17 to enter the central cavity 32' from below the cooking surface 90, resulting in a burner 2 that draws in primary air 17 completely and exclusively from below the stove 90.

[0119] Furthermore, the lower surface of the bottom of the base itself can be provided with molded side areas around each duct which rest totally or partially on the counter-shaped side areas provided on each concave element 31', 31'' and 31''' of the injector holder 6.

[0120] Advantageously, the injector holder 6 may be provided with additional fins 44 for supporting an ignition plug 45. Advantageously, the injector holder 6 may be provided with additional fins for supporting a thermocouple (not shown). It is however pointed out that depending on market requirements, the burner may or may not be provided with an ignition plug 45 and / or a thermocouple.

[0121] Advantageously, the central concave element 31' comprises at least two additional wings 44 projecting outwards. Preferably, as shown in the figures, the additional fins 44 are arranged so as to be flush with the hob 90 or to project above it or, in any case, to be visible from above the hob 90 when the injector holder 6 is mounted on it. Advantageously, a seat for supporting the ignition plug 45 can be obtained corresponding to the additional fins 44. Preferably, the two additional fins 44 extend radially outwards from or corresponding to a crown 37 that wraps around from the outside on the side wall of the central concave element 31'.

[0122] The operation of the burner 2 according to the invention is conventional in that the gas arriving at the injector holder 6 from the gas inlet 30 passes through the supply duct 34 and exits from the respective injectors 33', 33'' and 33''' in the corresponding cavities 32', 32'' and 32''' and from there in turn enters each channel 42', 42'' and 42''' in the base 4, taking with it in the lateral cavities 32'' and 32''' the primary air 17 from below (at least from below or only from below) the cooking surface 90 and in the central cavity 32' the primary air 17 drawn from above (at least from above or only from above) the cooking surface 90.

[0123] The gas and primary air 17 flows either begin to mix in the flow passages 42', 42'' and 42''' (particularly if the ducts have internal passage sections that do not define vertical, straight Venturi ducts) and then complete mixing in the corresponding chambers 10 and 20 into which they flow, or are largely or totally mixed in the flow passages 42', 42'' and 42'''' (particularly if the ducts define internal vertical, straight Venturi passages) and then flow into the corresponding chambers 10 and 20 already completely mixed, or in any event largely mixed.

[0124] In particular, the mixture of gas (exiting the central injector 33') and primary air 17 (captured in the central cavity 32') passes through the central flow passage 42' and then into the inner chamber 10, thereby feeding the first flame crown 12 exiting the first door 11. Furthermore, the mixture of gas (exiting the two side injectors 33'' and 33'''') and primary air 17 (captured in the side cavities 32'' and 32'''') passes through the side flow passages 42'' and 42'''' and then into the outer annular chamber 20, thereby feeding the second flame ring 22 exiting the second door 21 and / or the third flame crown 24 exiting the third door 23.

[0125] Advantageously, in an embodiment not shown here, it will be understood that the central concave element 31' may be made similar to the lateral concave elements 31'' and 31''', thereby making it possible to suck primary air 17 entering from below the stove (either only from below or also from below) into the central cavity 32'.

[0126] The present invention also, in its essential and / or preferential characteristics, relates solely to the injector holder 6 as described above.

[0127] From what has been said so far it is clear that the burner according to the invention, and in particular its injector holder, has certain advantages over the prior art solutions, for the following reasons: Despite the elongated development of the injector holder, the burner according to the invention is at the same time able to generate a high heating power, in particular corresponding to a flame crown which emerges evenly and homogeneously from the outer annular chamber. The burner according to the invention is compact, with a small overall width, in particular due to the elongated injector holder, which allows considerable space savings and facilitates installation in certain applications. The burner according to the invention is lightweight. The burner according to the invention is particularly economical as it requires less material to be used and, furthermore, being elongated, it allows for more imprints in the die casting mould and, as a result, more parts can be produced in one die casting run. The burner according to the invention is very simple and inexpensive to make, since it consists of only three parts and the base can be made from one die-cast part without any recovery work. The burner according to the invention is particularly limited in height. The burner according to the invention is particularly simple, quick and intuitive to assemble in three parts (injector holder, base and lid).

[0128] In particular, the burner according to the invention, and in particular its injector holder, has some advantages over conventional solutions, since it is more economical and compact than conventional solutions while still being able to generate high heating powers.

[0129] Although the present invention has been illustrated and described in some of its preferred embodiments, it is understood that in practice practicable modifications can be made thereto without departing from the scope of protection of this patent for industrial inventions.

Claims

1. A gas burner (2) for a cooktop (90), preferably suitable for installation on a built-in cooktop, Injector holder (6), A base (4) that can be placed on the injector holder (6), At least one lid (8) that can be placed on the base (4) and Equipped with, The at least one lid (8), the base (4), and the injector holder (6) are superimposed along the Z direction. The base (4) comprises an inner chamber (10) for mixing and / or distributing a mixture of air and gas to supply a first flame ring (12), and an outer annular chamber (20) for mixing and / or distributing a mixture of air and gas to supply a second flame crown (22) and / or a third flame crown (24). The at least one lid (8) is configured to close the top of the inner chamber (10) and the outer annular chamber (20), The injector holder (6) is A central recessed element (31') that internally partitions a corresponding central cavity (32') to which a corresponding central injector (33') is mounted, wherein the central cavity (32') is in fluid communication with the inner chamber (10) of the base (4), Two lateral concave elements (31'', 31'''') internally demarcate each of the two lateral cavities (32'', 32''''), each of which is fitted with a corresponding lateral injector (33'', 33''''), and the lateral cavities (32'', 32'''') are in fluid communication with the outer annular chamber (20) of the base (4), the two lateral concave elements (31'', 31'''') The single gas inlet (30) is in fluid communication with all three injectors (33', 33'', 33'''') and Equipped with, The central cavity (32') is positioned between the two lateral cavities (32'', 32''''), and the three cavities (32', 32'', 32'''') are arranged side by side along the X direction. The injector holder (6) has a substantially elongated shape along the X direction, and the extension of the injector holder (6) along the X direction is different from and larger than the extension of the injector holder (6) along the Y direction, and the X direction and the Y direction are orthogonal to each other and also orthogonal to the Z direction. Each of the two lateral concave elements (31'', 31''') is provided with at least one corresponding opening (50'', 50''') for primary air (17) to enter the corresponding lateral cavity (32'', 32''') from at least below the stove (90), or only from below the stove (90), A gas burner characterized in that the unfolded portion of the injector holder (6) along the Y direction is substantially less than or equal to about 1 / 3 of the unfolded portion of the injector holder itself along the X direction.

2. The gas burner according to claim 1, characterized in that the deployment axes of the central injector (33') and the two lateral injectors (33'', 33'''') are arranged side by side along the X direction, and each of the injectors (33', 33'', 33'''') has a deployment axis aligned along a direction substantially corresponding to or parallel to the Z direction.

3. The gas burner according to claim 1, characterized in that, downstream of each of the injectors (33', 33'', 33'''), the three cavities (32', 32'', 32''') are fluidly separated from one another, and therefore the gas that exits from each injector into the corresponding cavity in which the injector itself is housed does not mix with the gas that exits into the other two cavities.

4. The gas burner according to claim 1, characterized in that the three cavities (32', 32'', 32'''') are spaced apart downstream of each of the injectors (33', 33'', 33'''').

5. The gas burner according to claim 1, characterized in that the unfolded portion of the injector holder (6) along the Y direction is substantially less than half the diameter of the base (4) in plan view, and preferably substantially less than about one-third the diameter of the base (4) in plan view.

6. The injectors (33', 33'', 33'''') are mounted at the bottom of the corresponding cavities (32', 33'', 32''''), and the gas burners are, The three injectors are in fluid communication, Located below the bottom wall of the cavity, The gas burner according to claim 1, characterized in that it comprises a single supply duct (34) that is in fluid communication with the gas inlet (30) at one end.

7. The gas burner according to claim 1, characterized in that the bottom of the base (4) and the injector holder (6) are configured such that, after the base (4) is placed on the injector holder (6), the lateral cavities (32'', 32'''') are sealed, or a large amount of primary air (17) entering from above the stove (90) enters the cavities (32'', 32'''').

8. The central concave element (31') of the injector holder (6) is closed on both its bottom and side surfaces. The gas burner according to claim 1, characterized in that the bottom of the base (4) and the injector holder (6) are configured such that, after the base is placed on the injector holder (6), a passage is defined between them, allowing primary air (17) entering from above the stove (90) to enter the central cavity (32') of the injector holder (6).

9. The aforementioned base (4) is A central duct (40') is positioned at the bottom to face the central injector (33') and internally defines a central flow path (42') that opens to the inner chamber (10) at the top, Two lateral ducts (40'', 40''''), each facing one of the two lateral injectors (33'', 33'''') and defining a lateral flow path (42'', 42'''') opening at the top into the outer annular chamber (20) and A gas burner according to claim 1, characterized by comprising the following features.

10. The gas burner according to claim 9, characterized in that the central duct (40') and / or the two lateral ducts (40'', 40''') define a linear venturi flow path inside them.

11. The central duct (40'), and the inner chamber (10) through which the central duct (40') opens, are configured to define a radial venturi, and / or The two lateral ducts (40'', 40'''') and the outer annular chamber (20) through which the lateral ducts (40'', 40'''') open are configured to define a radial venturi. The gas burner according to claim 9, characterized in that...

12. The gas burner according to claim 9, characterized in that the corresponding contact surfaces are provided on the underside of the bottom of the base itself around each lateral duct (40'', 40''') which is configured to rest in contact with the entire upper edge of each collar (35'', 35''') of each of the lateral concave elements (31'', 31''') of the injector holder (6), thereby defining a closure that is substantially airtight or, in any case, prevents a large amount of primary air (17) from entering each of the lateral cavities (32'', 32''') of the injector holder (6) from above the stove (90).

13. The gas burner according to claim 1, characterized in that, downstream of each of the injectors (33', 33'', 33'''), the walls defining the three cavities (32', 32'', 32''') are separated from each other and not shared between the central cavity (32') and the lateral cavities (32'', 32'''').

14. The gas burner according to claim 1, characterized in that the base (4) is configured to function as a flame diffuser.

15. The gas burner according to claim 1, characterized in that it consists only of the injector holder (6), the base (4), and the at least one lid (8).

16. The gas burner according to claim 1, characterized in that the three concave elements (31', 31'', 31''') of the injector holder (6) are substantially well or cup-shaped, spaced apart, and connected to each other at the bottom by corresponding connecting portions (38).

17. The gas burner according to claim 1, characterized in that the base (4) and the injector holder (6) are configured such that the base (4) is supported on the injector holder (6) that the base itself is spaced apart from the stove (90) to the extent that it determines a passage for secondary air intended for the first flame ring (12) and / or the third flame ring (24).

18. The gas burner according to claim 1, wherein the injector holder (6) is provided with means for fixing the injector holder (6) to the stove (90), and preferably the means is provided on the lateral concave elements (31'', 31''') of the injector holder (6) itself.

19. The unfolded portion along the Y direction of each of the two lateral cavities (32'', 32''') is substantially equal to, slightly larger than, or smaller than, the unfolded portion along the Y direction of the central cavity (32'), and / or The gas burner according to claim 1, characterized in that the unfolding portion along the X direction of each of the two lateral cavities (32'', 32''') is substantially equal to, slightly larger than, or smaller than the unfolding portion along the X direction of the central cavity (32').

20. The gas burner according to claim 1, characterized in that, on the lower surface of the bottom of the base (4), side portions are provided around each duct (40', 40'', 40''') that are shaped to rest entirely or partially on the corresponding portions of the opposing side surfaces provided on each of the concave elements (31', 31'', 31'''') of the injector holder (6).

21. The gas burner according to claim 1, characterized in that the maximum distance along the Y direction between at least one opposing edge of the three cavities (32', 32'', 32''') is about one-third or less of the distance between the outermost edges of the two lateral cavities (32'', 32'''') along the X direction.

22. A gas burner nozzle holder (6) is provided, which can be installed on a stove (90) and comprises a base (4) that is superimposed on the nozzle holder (6) along the Z direction, wherein the nozzle holder (6) is A central recessed element (31') that defines a corresponding central cavity (32') inside which a corresponding central injector (33') is mounted, Two lateral concave elements (31'', 31'''') internally partition each of the two lateral cavities (32'', 32''''), and a corresponding lateral injector (33'', 33'''') is attached to each of the two lateral cavities (32'', 32''''), A single gas inlet (30') that is in fluid communication with all three of the aforementioned injectors (33', 33'', 33''') and Equipped with, The central cavity (32') is positioned between the two lateral cavities (32'', 32''''), and the three cavities (32', 32'', 32'''') are arranged side by side along the X direction. The injector holder (6) has a substantially elongated shape along the X direction, and the extension of the injector holder (6) along the X direction is different from and larger than the extension of the injector holder (6) along the Y direction, and the X direction and the Y direction are orthogonal to each other and also orthogonal to the Z direction. Each of the two lateral concave elements (31'', 31''') is provided with at least one corresponding opening (50'', 50''') for primary air (17) to enter the corresponding lateral cavity (32'', 32''') from at least below the stove (90), or only from below the stove, A nozzle holder characterized in that the unfolded portion of the injector holder (6) along the Y direction is approximately 1 / 3 or less of the unfolded portion of the injector holder itself along the X direction.

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