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 the injector holder (6); At least one lid (8) positionable on said base (4); Equipped with the at least one lid (8), the base (4) and the injector holder (6) are stacked along a Z direction; The base (4) comprises an inner chamber (10) for mixing and / or distributing a mixture of air and gas, thereby providing a first flame ring (12), and an outer annular chamber (20) for mixing and / or distributing a mixture of air and gas, thereby providing a second flame crown (22) and / or a third flame crown (24), The at least one lid (8) is configured to close the inner chamber (10) and the outer annular chamber (12) from above; 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, said central cavity (32') being in fluid communication with the inner chamber (10) of the base (4); two lateral concave elements (31'', 31''') separated from each other by respective lateral cavities (32'', 32'''), in each of said two lateral cavities (32'', 32''') a corresponding lateral injector (33'', 33''') is mounted, said lateral cavities (32'', 32''') being in fluid communication with said outer annular chamber (20) of said base (4); a first gas inlet (30') in fluid communication with the central injector (33'), and another gas inlet (30'') in fluid communication with the side injectors (33'', 33''); Equipped with the central cavity (32') is disposed between the two side cavities (32'', 32'''), and the three cavities (32', 32'', 32''') are disposed side by side along the X direction; the injector holder (6) has a substantially elongated shape along an X direction, an extension of the injector holder (6) along the X direction is different from and larger 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 perpendicular to a Z direction; each of said two lateral concave elements (31'', 31''') respectively comprises at least one opening (50'', 50''') for the primary air (17) to enter into the corresponding lateral cavity (32'', 32''') at least from below the cooking surface (90) or only from below said cooking surface, The developed portion of the injector holder (6) along the Y direction is substantially equal to or less than about 1 / 3 of the developed portion of the injector holder itself along the 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 generally comprise an injector holder, a base disposed on the injector holder, and at least one cover disposed on the base and defining a chamber for mixing and distributing a mixture of air and gas.

[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 inlet(s).

[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 diffuser, 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] Furthermore, among burners with multiple flame crowns, a type called "dual" is known, which has two gas inlets, one for supplying gas to the outer annular chamber and the other for supplying gas to the inner central distribution chamber. In particular, this type of burner uses a special two-way valve, which allows two operating states: one at maximum power with gas supply to both chambers of the burner, and another in which the gas supply to the annular chamber is excluded. This allows a more modular use and, in particular, a lower minimum power.

[0009] In known solutions, the injector holder generally has a central cavity and two lateral cavities. More specifically, 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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

[0014] 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.

[0015] 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.

[0016] Another object of the invention is to propose a gas burner which allows a high modularization of the fire heat output.

[0017] Another object of the invention is to propose a gas burner which makes it possible to have a particularly low minimum heating output.

[0018] Another object of the invention is to propose a gas burner which can be assembled and disassembled extremely simply, quickly and safely.

[0019] 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.

[0020] Another object of the invention is to propose a gas burner which has a particularly pleasing overall aesthetic effect.

[0021] Another object of the invention is to propose a gas burner with a reduced number of components.

[0022] Another object of the invention is to propose a gas burner which can be obtained at extremely low manufacturing costs.

[0023] Another object of the invention is to propose a gas burner which can be mass-produced quickly and efficiently.

[0024] Another object of the invention is to propose a gas burner having alternative and / or improved characteristics, both from a structural and functional point of view, with respect to the prior art.

[0025] 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.

[0026] Another object of the invention is to propose a gas burner of simple construction and low cost.

[0027] Another object of the invention is to propose an injector holder which is more compact and less expensive than those of the prior art.

[0028] Another object of the invention is to propose an injector holder that is lighter and / or has a smaller footprint than conventional ones.

[0029] Another object of the invention is to propose an injector holder which can be manufactured simply, quickly and at limited cost.

[0030] Another object of the invention is to propose an injector holder that can be used with burners operating in a "dual" version.

[0031] 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.

[0032] All these objects, either alone or in any combination thereof, as well as other objects arising from the following description, are achieved according to the present invention by a gas burner having the features of claim 1 or by an injector holder having the features of claim 14. [Brief description of the drawings]

[0033] The invention will be further defined below in some of its preferred embodiments, illustrated purely for illustrative and non-limiting purposes with reference to the attached drawings, in which:

[0034] [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, taken along a vertical cross-sectional plane passing through all three cavities of the nozzle holder along its longest extension direction. [Figure 1C]It is a view of the burner of FIG. 1A in an assembled state, which is a vertical cross-sectional plane orthogonal to the vertical cross-sectional plane of FIG. 1B and cuts only the central cavity of the injector holder along the short deployment direction of the injector holder itself. [Figure 2A] It is a top perspective view of only the injector holder according to the present invention used in the burner of FIG. 1A. [Figure 2B] It is a bottom perspective view of the injector holder of FIG. 2A. [Figure 3A] It is an exploded perspective view of the burner according to the present invention in different embodiments. [Figure 3B] It is a view of the burner of FIG. 3A in an assembled state, which is a vertical cross-sectional plane that passes through all three cavities of the nozzle holder along the longest deployment direction of the nozzle holder. [Figure 3C] It is a view of the burner of FIG. 3A in an assembled state, which is a vertical cross-sectional plane orthogonal to the vertical cross-sectional plane of FIG. 3B and cuts only the central cavity of the injector holder along the shortest deployment direction of the injector holder itself. [Figure 4A] It is a top perspective view of only the base of the burner of FIG. 1A or FIG. 3A. [Figure 4B] It is a bottom perspective view of the base of FIG. 4A. [Diagram 5] It is a plan view of a cooking stove including the injector holder of the burner of FIG. 1A. [Figure 6] It is a plan view of the burner of FIG. 1A or FIG. 3A without a cover. [Figure 7A] It is a plan view of the burner of FIG. 1A or FIG. 3A with a lid and showing the first flame crown. [Figure 7B] It is a plan view of the burner of FIG. 1A or FIG. 3A with a lid and showing all three flame crowns.

DETAILED DESCRIPTION OF THE INVENTION

[0035] 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 .

[0036] 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.).

[0037] Preferably, for example in the embodiment shown, the base 4 acts as a flame diffuser. 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.

[0038] 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''.

[0039] 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 greater 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 complete a three-dimensional direction in a Cartesian coordinate system and are perpendicular to the Z direction, which also corresponds 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Advantageously, the base 4 is made in one piece.

[0044] As mentioned above, the burner 2 comprises at least one lid 8 for closing said inner chamber 10 and said outer annular chamber 20. 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.

[0045] Advantageously, the outer annular chamber 20 is separated from the inner chamber 10 (preferably located centrally in the base 4) by an inner recessed region 13 having a substantially annular development. Suitably, the outer annular chamber 20 and the inner chamber 10 are further interconnected by a radial section 14 that crosses the inner recessed region 13. Preferably, the radial connecting section 14 may be provided at the bottom of the inner recessed region 13.

[0046] Preferably, in the embodiment shown in the figures, the outer annular chamber 20 and the inner chamber 10 are not in fluid communication with each other, however, in some possible embodiments not shown here, there may be radial flow passages across the inner recessed region 13 to fluidly connect the outer annular chamber 20 and the inner chamber 10.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] Advantageously, the first flame crown 12 emerges in the recessed region 13 and is directed outward, whereas the third flame crown 24 emerges in the recessed region 13 and is directed inward.

[0051] 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 .

[0052] 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.

[0053] Advantageously, and more particularly, the inner chamber 10 is bounded laterally by a cylindrical wall 15, downwardly by a bottom surface, while upwardly it is bounded and closed by a first lid 8' (i.e. the central part of the single lid 8).

[0054] Advantageously, the first door 11 is defined in the upper edge of the cylindrical wall 15 .

[0055] 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.

[0056] 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 include a small through hole, which is closed on all sides of the passage section and obtained entirely on the base 4 only, or a small through hole, which is closed on all sides of the passage section and obtained entirely on the lid 8 only.

[0057] 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.

[0058] 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 protrudes the upper part of each of the two lateral ducts 40'' and 40''' of the base 4 (preferably each having an upwardly converging frustoconical shape), as will be explained in more detail below.

[0059] Conveniently, the second door 21 is defined in an upper edge of the outer side wall 25 of the base 4. Conveniently, the second door 21 may comprise a second primary slot / hole 21 and a second secondary slot / hole 21, respectively, that are different in shape and / or size.

[0060] Preferably, the third port 23 is defined in an upper edge of the inner sidewall 26 of the base 4. Preferably, the third port 23 may comprise a third primary slot / hole 23 and a third secondary slot / hole 23, respectively, that are different in shape and / or size.

[0061] 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.

[0062] 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.

[0063] 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 (in particular, 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 diameter of the base 4 in plan view (in particular, substantially corresponds to the diameter of the outer side wall 25).

[0064] The injector holder 6 is configured and intended to be applied to at least one through opening 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.

[0065] Preferably, the injector holder 6 is adapted to fit closely underneath to the sheet metal of the cooktop 90 around the at least one through opening formed in the cooktop 90.

[0066] The injector holder 6 comprises three concave elements, 31', 31'' and 31''', each defining a corresponding cavity therein, 32', 32'' and 32'''', respectively, in which a corresponding injector, 33', 33'' and 33''', respectively, is mounted. Advantageously, the injector holder 6 is made in one piece.

[0067] In particular, the injector holder 6 is a central concave element 31' defining a corresponding central cavity 32' therein, in which a corresponding central injector 33' is mounted; two lateral concave elements 31'' and 31''' defining lateral cavities 32'' and 32''' therein in which corresponding lateral injectors 33'' and 33''' are mounted, respectively; Equipped with.

[0068] Preferably, the three concave elements 31', 31'' and 31'' are substantially well- or cup-like shaped.

[0069] Advantageously, the three concave elements 31 ′, 31 ″ and 31 ″′ are connected to one another at their bottoms by corresponding connections 38 .

[0070] Advantageously, the three injectors 33', 33'' and 33''' have a substantially vertical extension (i.e. along the Z direction), and in particular the extension axes of each injector 33', 33'' and 33''' are aligned along the Z direction.

[0071] Preferably, the axes of the three injectors 33', 33'' and 33''' are parallel to each other.

[0072] Preferably, the axes of the three injectors 33', 33'' and 33'' are aligned along the X direction.

[0073] 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.

[0074] Advantageously, the central injector 33' is interposed between the lateral injectors 33'' and 33'''.

[0075] Advantageously, the central injector 33' is mounted with a height / dimension along the Z direction which is different from the height / dimension of the two lateral injectors 33'' and 33''' which are of the same height / dimension. Preferably, in the embodiment of Figures 1A-1C, the central injector 33' is at a higher position relative to the lateral injectors 33'' and 33''' and correspondingly the bottom of the central cavity 32' is at a higher position relative to the bottom of the lateral cavities 32'' and 32'''. Preferably, in the embodiment of Figures 3A-3C, the central injector 33' is at a lower height / level than the lateral injectors 33'' and 33''' and correspondingly the bottom of the central cavity 32' is at a lower height / level than the bottom of the lateral cavities 32'' and 32''.

[0076] Advantageously, in a possible embodiment not shown, the axes of the three injectors 33', 33'' and 33''' can be mounted at the same height along the Z direction.

[0077] The injector holder 6 has a first gas inlet 30' in fluid communication with the central injector 33' and also has another (second) separate gas inlet 30'' in fluid communication with the side injectors 33'' and 33'''.

[0078] Advantageously, the two gas inlets 30' and 30'' are intended to be associated and controlled by a "dual" type valve or by two separate corresponding single outlet valves. Thus, the burner 2, and in particular its injector holder 6, is preferably provided with two separate gas inlets 30' and 30'', so that the first flame ring 12 can be adjusted differently and independently from the second flame crown 22 and / or the third flame crown 24.

[0079] Advantageously, the injector holder 6 comprises two supply ducts 34' and 34'' connected respectively to the first gas inlet 30' and to the further gas inlet 30'' and fluidically separated from each other.

[0080] Advantageously, the injector holder 6 is internally provided with a first gas feed conduit 34' fluidly connected to the first gas inlet 30' and to the central injector 33'. Advantageously, the first feed duct 34'' extends longitudinally substantially along the deployment direction Y of the injector holder 6. Preferably, the first feed duct 34' is arranged below and / or at the bottom wall of the central cavity 32'. Preferably, the first feed duct 34' extends horizontally or substantially horizontally at the bottom of the central concave element 31'. Preferably, the first feed duct 34' opens at one end at the first gas inlet 30' and communicates only with the central injector 33'. Preferably, the first feed duct 34' has a constant or slightly convergent cross section along its longitudinal extension.

[0081] Advantageously, the injector holder 6 is internally provided with a second gas supply duct 34'', which is fluidly connected to the further gas inlet 30'' and to both the lateral injectors 33'' and 33''. Advantageously, the second supply duct 34'' extends longitudinally substantially along the deployment direction X of the injector holder 6.

[0082] Preferably, the second feed duct 34'' is arranged below the bottom wall of each of the three cavities 32', 32'' and 32'''. Preferably, the second feed duct 34'' extends horizontally or substantially horizontally at the bottom of the injector holder 6. Preferably, the second feed duct 34'' opens at one end at another gas inlet 30'' and communicates with the two lateral injectors 33'' and 33''. Preferably, the feed duct 34 has a constant or slightly convergent cross section along its longitudinal development.

[0083] Advantageously, the second supply duct 34'' has a greater longitudinal extension than the extension of the first supply duct 34'. Advantageously, the second supply duct 34'' traverses the injector holder 6 over most of its extension along the X direction.

[0084] Preferably, the other gas inlet 30'' is located near one of the two lateral injectors 33'' (and therefore also near the corresponding lateral cavity 32''), and more preferably, the end of the second supply duct 34'', i.e. the end opposite to the end connected to the other gas inlet 30'', terminates substantially near the other lateral injector 33'''', which is further away from the other gas inlet 30''.

[0085] Advantageously, the second supply duct 34'' extends longitudinally along a direction which is angled, preferably perpendicular, to the longitudinal extension of the first supply duct 34'.

[0086] Advantageously, the first supply duct 34' is arranged above (along the Z direction) with respect to the second supply duct 34''.

[0087] Suitably, the first supply conduit 34' has a longitudinal extension less than half, preferably less than about 1 / 3, more preferably less than about 1 / 5 of the longitudinal extension of the second supply conduit 34''. Advantageously, the first supply conduit 34' has a longitudinal extension less than half, preferably less than about 1 / 3, more preferably less than about 1 / 5 of the diameter of the base 4.

[0088] Preferably, the second supply duct 34'' traverses a connection 38 associated with the bottoms of the three aforementioned concave elements.

[0089] Advantageously, in one possible embodiment (see Figures 3A to 3C), the central concave element 31' with the first supply duct 34' is obtained in a first part 51 separate from a second part 52 comprising the lateral concave elements 31'' and 31'' and the lower connection part 38 in which the second supply duct 34'' is defined.

[0090] Advantageously, in this case, between the lateral concave elements 31'' and 31''' of the second part 52, an intermediate receiving area 53 for the first part 51, in particular for the central concave element 31' formed in said first part. Preferably, the bottom of the first part 51 comprises at least one area configured to rest on a corresponding base surface 54 formed outside and above the connection 38 in correspondence with said intermediate area 53. Preferably, the bottom of the first part 51 is configured to rest on the base surface 54 and can also be configured to extend below the side of the base surface 54 of the second part 52.

[0091] Preferably, the first part 51 and the second part 52 are configured such that, when both are separately and independently fixed to the stove 90, the first part 51 is received in the intermediate region 53 of the second part 52 and at least a portion of the bottom of the first part 51 contacts the base surface 54 of the second part 52.

[0092] Advantageously, in a further possible embodiment as shown in Figures 3A-3C, the lateral injectors 33'' and 33''' are fluidly connected to the second supply duct 34'' by respective fluid communication branches 55'' and 55''', preferably extending along the Z direction. Advantageously, in this case, the bottoms of the lateral cavities 32' and 32''' are further away from the second supply duct 34'' and the connection 38 therefore has a greater extension along the direction Z.

[0093] Advantageously, the three cavities 32', 32'', 32''', from which gas emerges from each injector 33', 33'', 33''', are fluidically isolated from one another. In other words, the injector holder 6 is configured such that downstream of each injector 33', 33'', 33''', the 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 the gas emerging from each injector into the other two cavities. Advantageously, downstream of each injector 33', 33'', 33''', the injector holder 6 has no ducts or fluid communication between the central cavity 32' and the lateral cavities 32'' and 32''', or vice versa. Preferably, downstream of each injector 33', 33'' and 33''', the three cavities 32', 32'', 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 one another, and furthermore, said walls are not shared between the central cavity 32' and the lateral cavities 32'' and 32'''.

[0094] 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. In essence, this avoids fluid interference between the injectors 33', 33" and 33''' and between the primary air flows returned by the three injectors 33', 33" and 33''' in the respective cavities 32', 32" and 32'".

[0095] 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.

[0096] Advantageously, the three cavities 32', 32'' and 32''' are arranged substantially side-by-side along the X direction, in particular the central cavity 32' being interposed between the two lateral cavities 32'' and 32'''. Advantageously, as mentioned above, the first supply duct 34' extends longitudinally substantially along the Y direction, whereas the second supply duct 34'' extends longitudinally substantially along the X direction.

[0097] 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.

[0098] Advantageously, in some possible embodiments, the outer annular chamber 20 may comprise two sectors 20' and 20'' fluidly 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 symmetrical to each other.

[0099] 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 either within the internal recessed region 13).

[0100] 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.

[0101] 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 lid 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.

[0102] 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.

[0103] The outer annular chamber 20 is in fluid communication with 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 .

[0104] 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 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.

[0105] 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''.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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, respectively 40'' and 40''', each of which defines a corresponding lateral flow passage 42'' and 42''' therein, which lateral flow passages face downwards of the respective lateral injectors 33'' and 33'''' of the injector holder 6 and open at their tops into the outer annular chamber 20 (preferably externally); Includes.

[0111] Preferably, the central duct 40 ′ extends along the Z direction and at least partially extends downward from the bottom of the base 4 .

[0112] 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 .

[0113] 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.

[0114] 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'.

[0115] 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'''.

[0116] 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.

[0117] Advantageously, the ducts 40', 40'' and / or 40''' may define a straight venturi passage therein, preferably having a vertical or substantially vertical axis.

[0118] 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.

[0119] Preferably, the central duct 40' defines a substantially converging (away from the injector) central flow passage 42' therein.

[0120] 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.

[0121] 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, thereby determining the passage of secondary air for the first flame crown 12 and / or the third flame crown 24, i.e. the flame appearing within the inner recessed region 13.

[0122] 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 so as to fit closely to the stove 90 from below. Conveniently, corresponding to the fins 36, there are provided two or more through holes 47 (preferably threaded) 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'''.

[0123] Advantageously, in a possible embodiment as shown in Figures 3A-3C, the first part 51 and the second part 52 are each provided with means for separate mechanical fastening to the hob 90. Preferably, in this case, means for fastening the injector holder 6 to the hob 90 are provided corresponding to the central concave element 31' and corresponding to said lateral concave elements 31'' and / or 31'''' of the injector holder itself. In particular, in this case, the central concave element 31' formed in the first part 51 is provided with at least two flaps 36 projecting outwards to seal against the hob 90 from below, and similarly, the two lateral concave elements 31'' and / or 31'''' formed in the second part 52 are provided with at least two fins 36 projecting outwards to seal against the cooking surface 90 from below. Advantageously, corresponding to all fins 36 of both the first part 51 and the second part 52, two or more through holes 47 (preferably threaded) can be obtained through which members 48 (e.g. screws) pass for fastening separately the first part 51 and the second part 52, which together define the nozzle holder 6, to the sheet metal of the stove 90. Preferably, the two fins 36 extend radially outwardly from or corresponding to a crown 37 that wraps externally around the periphery of the side wall of each concave element 31', 31'' and 31'''.

[0124] Advantageously, in a possible embodiment not shown, the first part 51 and the second part 52 are provided with mutual fastening means, by which the injector holder 6 can be assembled before being mounted on the stove 90. Preferably, in this case, the mechanical fastening means can comprise an interlock, an interference, a form ratio and / or an engagement element by use of a mechanical member such as a screw.

[0125] Advantageously, the through holes 47 are arranged transversely to the second 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 with the second supply conduit 34'', thus avoiding that the operations for obtaining said holes affect (even inadvertently) the integrity of the second supply conduit 34''.

[0126] 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 .

[0127] Advantageously, the bottom of the base 4 and the injector holder 6 are configured in such a way 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 to prevent any significant intrusion of the primary air 17 coming from above the cooktop 90 into said cavities 32'' and 32''. 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 intrusion of cooking residues, dirt or liquids coming from above the cooktop into the lateral cavities 32'' and 32''', which may undesirably block the corresponding injectors or come into contact with the application itself or with electronic components contained thereunder (e.g. oven).

[0128] 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 entering from above the stove 90 to enter the lateral cavities 32'' and 32''' of the injector holder 6.

[0129] 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.

[0130] 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.

[0131] 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'.

[0132] 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'.

[0133] 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 less than the extension along the X direction of the central cavity 32'.

[0134] 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%).

[0135] 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 supply 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%), preferably (i.e. with a gas-air mixture sufficiently rich in primary air).

[0136] Advantageously, the base 4 is provided with lower means for supporting and connecting said base to the injector holder 6 .

[0137] 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 to any significant extent into each lateral cavity 32'' and 32'' provided in the injector holder 6.

[0138] Advantageously, the central duct 40' may 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', there is contact and closure between the abutment side surfaces 43'' and 43''', which may be substantially airtight or in any case may prevent a significant ingress of the primary air 17 from above the hob 90 into the interior of the lateral cavities 32'' and 32'''' 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.

[0139] Furthermore, the lower surface of the bottom of the base itself can be provided with molded side areas around each lateral duct 40'' and 40''' which rest entirely or partially on the counter-shaped side areas provided on each concave element 31', 31'' and 31''' of the injector holder 6.

[0140] 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.

[0141] 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 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'.

[0142] The operation of the burner 2 according to the invention is conventional in that gas arriving at the injector holder 6 from the gas inlets 30' and 30'', passes through the respective supply ducts 34' and 34'', exits from the injectors 33', 33'' and 33''' in the corresponding cavities 32', 32'' and 32'''', and from there in turn enters respective channels 42', 42'' and 42''' in the base 4, drawing in primary air 17 taken from below (at least from below, or only from below) the cooking surface 90 in the side cavities 32'' and 32'''', and from above (at least from above, or only from above) the cooking surface 90 in the central cavity 32'. In particular, gas arriving from a first inlet 30' passes through a first supply duct 34' and exits through a central injector 33' in the central cavity 32', while gas arriving from the other inlet 30'' passes through a second supply duct 34'' and exits through side injectors 33'' and 33''' in the respective side cavities 32'' and 32'''.

[0143] 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 the interior of vertical, straight Venturi passages) and then flow into the corresponding chambers 10 and 20 already completely mixed, or in any event largely mixed.

[0144] 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'''') traverses 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.

[0145] As mentioned above, the two gas inlets 30' and 30'' are preferably connected to a "dual" valve having two outlets, but alternatively can be connected to two separate single outlet valves. Advantageously, the burner 2 can assume two states in an operational configuration. In particular, when the two outlet valves, or both single outlet valves, command gas to be supplied to both inlets 30' and 30'', a maximum flow state is obtained in which gas is supplied to all three injectors 33', 33'' and 33''' in order to generate all three flame crowns 12, 22 and 24 simultaneously (see FIG. 7B). On the other hand, when the inlet valves control the supply of gas only to the first inlet 30', a minimum flow state is obtained in which gas is supplied only to the central injector 33', thereby generating only the first flame crown 12 (see FIG. 7A).

[0146] Advantageously, in an embodiment not shown here, it will be understood that the central concave element 31' is made similarly to the lateral concave elements 31'' and 31''', thereby making it possible to suck primary air 17 coming from below the stove (either only from below or also from below) into the central cavity 32'.

[0147] The present invention also, in its essential and / or preferential characteristics, relates solely to the injector holder 6 as described above.

[0148] 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, in particular due to the elongated injector holder, with a small overall width, 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 and, moreover, its elongated shape allows more impressions to be made in the die casting mould, so that more parts can be produced in one die casting run. The burner according to the present invention is very simple and cheap to make, since it consists of only three parts and the base can be made from one die-cast part without 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).

[0149] 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.

[0150] 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'') that separate each other by 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), A first gas inlet (30') that is in fluid communication with the central injector (33'), and another gas inlet (30'') that is in fluid communication with the lateral injectors (33'', 33'''') 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 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 central injector (33') and the first supply duct (34') are in fluid communication with the first gas inlet (30'), A second supply duct (34'') is in fluid communication with both of the aforementioned lateral injectors (33'', 33'''') and the other gas inlet (30'') Equipped with, The gas burner according to claim 1, characterized in that the second supply duct (34'') extends longitudinally along a direction that is at an angle to the longitudinal extension of the first supply duct (34'), preferably a direction perpendicular to it.

7. The gas burner according to claim 6, characterized in that the first supply duct (34') has a longitudinally extended portion that is less than half, preferably about 1 / 3, and more preferably 1 / 5 of the longitudinally extended portion of the second supply duct (34'').

8. The gas burner according to claim 6, characterized in that the central concave element (31') having the first supply duct (34') is formed of a first part (51) that is different from a second part (52) which includes the lateral concave elements (31'', 31'''') and a lower connection part (38) inside which the second supply duct (34'') is defined.

9. 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'''').

10. 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 established between them, allowing primary air (17) entering from above the stove (90) to enter the central cavity (32') of the injector holder (6).

11. 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'''') that opens at the top into the outer annular chamber (20), and A gas burner according to claim 1, characterized by comprising the following features.

12. The gas burner according to claim 11, characterized in that the central duct (40') and / or the two lateral ducts (40'', 40''') define a linear venturi flow path inside them.

13. 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 gas burner according to claim 11, characterized in that 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.

14. The gas burner according to claim 11, characterized in that a corresponding contact surface is provided on the lower surface 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 of the collars (35'', 35''') 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).

15. 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'''').

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

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

18. 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 parts (38).

19. 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).

20. 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 itself.

21. The unfolded portion along the Y direction of each of the two lateral cavities (32'', 32''') is substantially equal to, slightly larger than, or slightly 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 slightly smaller than the unfolding portion along the X direction of the central cavity (32').

22. The gas burner according to claim 11, 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).

23. 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.

24. A gas burner nozzle holder (6) is provided with a base (4) that can be installed on a stove (90) and is superimposed on an injector holder (6) along the Z direction, wherein the injector 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'''') each define a lateral cavity (32'', 32'''') inside, and a corresponding lateral injector (33'', 33'''') is attached to each of the two lateral cavities (32'', 32''''), A first gas inlet (30') that is in fluid communication with the central injector (33'), and another gas inlet (30'') that is in fluid communication with the lateral injectors (33'', 33'''') 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 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 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.

Images