Atmospheric gas burner with removable injection nozzles

Abstract

Partially-aerated gas burner (1; T) comprising a burner base (100; 100') having at least one header (12; 12') for a fuel gas, at least one gas mixing tube (203a, 203b; 203') to mix the gas with primary' air, a burner head (200; 200') equipped with at least one distribution chamber (202; 202') for the combustible mixture, and at least one flame spreader (300; 300') fluidically connected to said at least one distribution chamber (202; 202'). The gas burner is characterized in that the burner base (100; 100') comprises at least one seat (23a, 23b; 23') for the removable coupling of at least one tubular turret (15a, 15b; 15') which supports an injection nozzle (16a, 16b; 16') for the fuel gas, and in that this at least one seat (23a, 23b; 23') is fluidically connected to the aforesaid at least- one header (12; 12') and the aforesaid at least one tubular turret (15a, 15b; 15') is fluidically connected, both to the at least one seat (23a, 23b; 23 ') and to the respective injection nozzle (16a, 16b; 16'), for the inflow of fuel gas from the header (12; 12') to the respective injection nozzle (16a, 16b; 16').

Description

[0001] Atmospheric gas burner with removable injection nozzles

[0002] Field of the invention

[0003] The present invention relates to an atmospheric gas burner, i.e. of partially-aerated type, in which a flow of fuel gas is injected through one or more injection nozzles into one or more mixing tubes, for example of Venturi type, so that, upon flowing out of this mixing tube, it forms a mixture with a predefined amount of air, known as "primary air", which is insufficient to produce combustion and in which this mixture is then discharged to the outside through the delivery holes of a flame spreader, so as to undergo the further supply of ambient air known as "secondary air", in order to be ignited.

[0004] More specifically, the present invention relates to an atmospheric gas burner, preferably suitable for cooking food, comprising a burner base carrying a fuel gas header and at least one injection nozzle, at least one mixing tube, a burner head with a channel and / or a distribution chamber for the gas - primary air mixture flowing out of the mixing tube, and a flame spreader for this mixture to be released from the channel and / or distribution chamber into the external environment.

[0005] Known prior art

[0006] It is known to manufacture atmospheric gas burners for domestic use, or in any case for cooking food, consisting of a number of suitably machined components which, once assembled, form the complete burner.

[0007] In particular, it is known to manufacture a burner base that is sometimes shaped like a cup and comprises constraining means to constrain it to a cooktop, a header for the inflow of fuel gas from an external distribution network, and one or more nozzles that are fluidically connected to the header for injecting the fuel gas into one or more mixing tubes.

[0008] This burner base is usually overlapped and coupled to a burner head that supports the aforesaid one or more mixing tubes and usually has a cylindrical chamber and / or a distribution channel for the combustible mixture formed in the aforesaid one or more mixing tubes. In turn, this burner head comprises, or is coupled to, a flame spreader, through whose holes the combustible mixture can reach the external environment to be burned, and is also surmounted by one or more top covers.The fuel gas injection nozzle or nozzles provided to the burner base are oriented so as to deliver a gas jet into the respective mixing tube or tubes.

[0009] Usually, the burner base is shaped in a single piece so as to have one or more tubular appendages supporting the injection nozzle or nozzles, which are fluidic-ally connected to the aforesaid header. The injection nozzle or nozzles are then mounted in the respective housing or housings, which are provided in the tubular appendage or appendages. This means that the mixing tube or tubes and the burner head must be manufactured with particular precision to ensure that the hole in each injection nozzle is precisely aligned with the inlet section of each respective mixing tube.

[0010] Furthermore, if an axis of the nozzle has to be inclined relative to the main axis of the respective tubular appendage, and if the burner base is made integrally with one or more tubular appendages, then for each nozzle two holes must be made along incident axes, so that at least one of the holes must be formed by also drilling portions of the burner base, which have then to be sealed, for example by means of one or more sealing balls. The injection nozzle, or nozzles, that is / are most suitable for the type of fuel gas to be injected and for the pressure with which this fuel gas is distributed by the external distribution network of the same fuel gas, must also be mounted on the burner base during the production of the burner base.

[0011] It is well known, indeed, that different types of gas, such as natural gas (methane), LPG (liquefied petroleum gas) or butane, as well as different gas supply pressures, require nozzles with different holes and shapes in order to ensure the correct amount of gas is injected into the mixing tube at the correct pressure so that it can then be mixed with the required amount of primary air.

[0012] In some burners, the injection nozzle is mounted by screwing, so that it can be replaced if necessary’ with an injection nozzle that is identical in external shape, but may have an outflow hole and internal geometry different from the original one.

[0013] For example, French Patent FR 2609158 A3 in the name of PHILIPS describes a similar burner in which the injection nozzle can be replaced by unscrewing and screwing it. However, since gas injection nozzles vary considerably in shape and, in particular, in external dimensions, it may be necessary for the burner manufacturer to modify the housing of each support for the injection nozzles of the burner base, and therefore tocarry out different machining operations for each of them, in order to adapt these supports to the specific injection nozzle required by the type and supply pressure of the fuel gas to be used in the burner.

[0014] An object of the present invention is to simplify the manufacture of an atmospheric gas burner to make it easily adaptable for use with different types of fuel gas and / or with different supply pressures of the same fuel gas.

[0015] Another object of the present invention is to make the production of a burner faster and less costly, by simplifying the number and complexity of the manufacturing steps.

[0016] A further object of the present invention is to make an atmospheric gas burner that provides high flexibility of use, allowing each respective injection nozzle to be changed easily and quickly depending on the type and supply pressure of the fuel gas which is to be used in the burner.

[0017] Summary of the invention

[0018] These and other objects are achieved by the atmospheric, i.e. partially-aerated, gas burner of the first independent claim and by that defined by the claims dependent therefrom.

[0019] The atmospheri c gas burner of the present invention comprises a burner base having at least one header for a fuel gas, at least one gas mixing tube to mix the gas with primary air, a burner head equipped with at least one distribution chamber for the combustible mixture, and at least one flame spreader fluidically connected to the aforesaid at least one distribution chamber. The burner is then completed by one or more top covers. Advantageously, the burner base comprises at least one seat for the removable coupling of at least one tubular turret which supports an injection nozzle for the fuel gas, wherein this at least one seat is fluidically connected to the aforesaid at least one header, such that said at least one tubular turret is fluidically connected both to a respective seat and to the respective injection nozzle, for the inflow of fuel gas from the header to the injection nozzle.

[0020] Since each tubular nozzle-holder turret can be removably coupled to the burner base, tubular turrets with the most suitable shape can be easily manufactured, even tubular turrets that are difficult, to manufacture by molding them integrally with the respectiveburner base, and these tubular turrets can be also easily arranged in the most suitable position on the burner base.

[0021] Furthermore, thanks to the removability of each tubular nozzle-holder turret, turrets with different shapes in terms of the respective housing for the injection nozzle can be used interchangeably, thus easily allowing injection nozzles of various shapes and configurations to be used or the same burner base to be used with horizontal, vertical or inclined mixing tubes.

[0022] Indeed, given the simple geometry of the piece, it is possible to easily to make a series of tubular nozzle-holder turrets in which the shape and / or arrangement of the housing for the injection nozzle varies, thus allowing nozzles of different shapes to be used or the nozzle outflow hole to be arranged along different axes, while the configuration of the connection of each tubular turret and the respective seat of the burner body remains unchanged, thus facilitating the interchangeability of either the injection nozzles, or the arrangement of the mixing tubes, on the same burner base.

[0023] It should be noted that here and below, the term "distribution chamber" refers to a chamber having any shape known per se, for example having annular or cylindrical shape with a circular or polygonal base, which comprises at least one inflow opening for the combustible mixture of gas - primary air and one or more outflow openings for this fuel mixture, and which allows the fuel mixture to flow therethrough.

[0024] Furthermore, the expression "nozzle-holder turret" is used herein to denote a tubular body which projects from a surface of the burner base and has a housing for a fuel gas injection nozzle at its end distant from this surface of the burner base.

[0025] According to an aspect of the present invention, each tubular nozzle-holder turret and the respective seat of the burner base are shaped so as to allow elastic interlocking of complementary parts, thereby creating a removable mechanical constraint.

[0026] Furthermore, in an embodiment, the gas burner comprises at least one shaped split pin to retain at least one tubular turret engaged with the respective seat, and in this regard both the tubular turret and the respective seat are shaped to house and reversibly retain the aforementioned shaped split pin between them, for example by means of recesses and / or holes.The use of split pins to reversibly retain each tubular nozzle-holder turret to the respective seat of the burner base prevents the tubular turrets from accidentally slipping out of their seats at the burner base.

[0027] According to another preferred aspect of the present invention, at least one of the tubular turrets comprises a housing for the removable coupling of the respective injection nozzle.

[0028] This allows the injection nozzle to be easily changed, provided, of course, that the housing of the respective tubular turret does not need to be modified.

[0029] In a preferred embodiment of the invention, the housing for a respective injection nozzle of at least one nozzle-holder turret has an axis incident, and preferably orthogonal to, the main axis of the body of the same nozzle-holder turret, that is to say that the gas follows an L-shaped or V- shaped path, or in general a path that follows a broken line consisting of two segments incident at one end thereof, to flow from the header at the burner base to the injection nozzle.

[0030] If the fuel gas header at the burner base is a cylindrical tube that runs along an axis parallel to the axis of the nozzle housing, the gas then follows a path that is substantially C-shaped or Z-shaped.

[0031] On the other hand, if the header is arranged on a plane different from the L-shaped or V-shaped path followed by the gas within the nozzle-holder turret, or in any other arrangement, the fuel gas still follows a broken path with three incident segments.

[0032] Thanks to this invention, which involves the separate manufacture of the tubular nozzle¬ holder turrets and their subsequent assembly on the body of the burner base in fluidic communication with the aforesaid fuel gas header, this path can be easily formed, i.e., without requiring external attachment holes to be plugged, and this path would otherwise be difficult to manufacture in a single-piece molded body since, in this case, performing incident perforations would require the external attachment holes of the machine tools that make these incident perforations to be plugged, for example by sealing balls.

[0033] Finally, according to a further aspect of the present invention, the aforesaid at least one seat of the burner base and the aforesaid at least, one tubular turret are geometricallyshaped to allow them to be coupled to each other in a predefined direction of the tubular turret with respect to the respective seat and therefore with respect to the burner base. Brief description of figures

[0034] The above-mentioned characteristics, together with other characteristics, of the present invention will be apparent from the detailed description of a respective preferred embodiment, provided by way of example and without limitations, with reference to the accompanying figures, in which:

[0035] Figure 1 is a three-dimensional view of an atmospheric gas burner, in an embodiment of the present invention;

[0036] Figure 2 is an exploded top view of the gas burner of Figure 1;

[0037] Figures 3 and 4 are partial exploded views, taken from below and above, respectively, of the burner base shown in figure 1;

[0038] Figure 5 is a side section view of the gas burner of Figure 1; and Figure 6 is a side section view of another burner according to a further embodiment of the present invention.

[0039] Description of an embodiment of the present invention

[0040] With reference first to the attached Figures 1 and 2, the atmospheric gas burner 1, according to a preferred aspect of the present invention, comprises a burner base 100, a burner head 200, and a flame spreader 300 which is equipped with top closing covers 301.

[0041] The base 100, the head 200 and the flame spreader 300, with their respective top covers 301, can be assembled together, i.e., they can be constrained on top of each other to form the gas burner 1.

[0042] This gas burner 1 is typically for domestic use, as heating element to heat food products. The head 200 of the gas burner 1 comprises two mixing tubes 203a, for example of the Venturi type, only one of which is visible in Figure 5, for mixing the fuel gas with the primary air, an annular channel 202 fluidically connected to the outflow sections of the mixing tubes 203a, and a tapered upwards protective skirt 201 which reduces or prevents foreign material from accessing the burner base 100 and defines, with this base 100, a passage d for the primary air.

[0043] The annular channel 202 is surmounted, preferably with a removable constraint, by theflame spreader 300, which is also annular and equipped with an integrated top cover 301, which is juxtaposed to the annular channel 202 itself.

[0044] In the embodiment illustrated herein, the flame spreader 300 comprises two substantially concentric rings 302, 303 of flame holes, from which the mixture of fuel gas and primary’ air fed by the mixing tubes 203a and present in the annular channel 202 is delivered.

[0045] The fuel gas - primary' air mixture which flows out of the flame holes of the flame spreader 300 can be ignited by means of a spark plug 400, thanks to the supply of secondary air from the external environment, and the presence of the flame can be detected by a thermocouple 500 connected to a safety valve (not shown) that is able to stop the gas delivery when no flame is detected by the thermocouple 500.

[0046] It should be noted that, in embodiments of the gas burner according to the present invention not illustrated herein, the burner head may comprise, alternatively or in addition to the annular channel, one or more distribution chambers with various geometries, for example cylindrical with a circular or even prismatic section and / or one or more additional annular channels.

[0047] Furthermore, without departing from the present invention, the burner head may comprise a single mixing tube or a plurality of mixing tubes, for example of the Venturi type, for mixing the fuel gas with primary air.

[0048] Furthermore, in embodiments not shown herein, the flame spreader 300 may have a single ring of flame holes or two or more rings of flame holes and may have, as an alternative to the top covers integrated therein, one or more removable top covers that can therefore be assembled onto the flame spreader 300 itself.

[0049] The flame spreader 300 can be made integrally with the burner head or can be a separate component, as in the burner 1 depicted herein.

[0050] Turning back to the gas burner shown in the accompanying Figures 1–5, the base 100 of the burner 1 consists of a bottom body 13 to which a fastening surface 11 is constrained, with a mounting gasket 14 interposed between the body 13 and the fastening surface 11. The fastening surface 11 may be a separate metal plate suitably shaped, perforated and equipped with means (not shown) for fastening it to a cooktop, or it may itself be part of the cooktop.With particular reference to Figures 3 to 5, the bottom body 13 of the base 100 comprises, at the bottom, a header 12 for the fuel gas, for example methane or LPG or the like, which is equipped with an inlet opening 121 to be coupled to a distribution network for the same fuel gas, and at least one seat, specifically two seats 23a and 23b, to be reversibly, i.e., removably, coupled to at least one tubular nozzle-holder turret, and specifically two tubular nozzle-holder turrets 15a, 15b, which, once mounted, project upward from the bottom body 13 and support, at their free end, a respective injection nozzle 16a, 16b.

[0051] Each seat 23a, 23b is fluidically connected to the aforesaid header 12 and each tubular turret 15a, 15b is fluidically connected both to the respective seat 23a, 23b and to the respective injection nozzle 16a, 16b, to allow the fuel gas to flow from the header 12 to the outflow hole of the injection nozzle 16a, 16b.

[0052] In the embodiment shown herein (see Figure 2), the mounting plate 14 and the fastening surface 11 allow the components projecting upward from the bottom body 13 to be centered and constrained, as well as the header 12 to be closed at the top.

[0053] It should be noted that the mounting plate 14 and the fastening surface 11 are equipped with seats for housing the turrets 15a, 15b, the spark plug 40 and the safety thermocouple 50.

[0054] Furthermore, as mentioned, when the fastening surface 11 does not coincide with a suitably shaped region of a burner cooktop, it may comprise means, not shown herein, for fastening to a cooktop or the top of stand-alone cookers.

[0055] The header 12 is fluidically connected to the two seats 23a, 23b and the latter are fluidically connected to the tubular nozzle-holder turrets 15a, 15b.

[0056] As can be seen in particular in Figures 3 to 5, each tubular turret 15a, 15b, which consists of a hollow body with a gas inlet section and a gas outlet section and preferably consists of a cylindrical body having circular internal section and axial extent, for example along a vertical axis, comprises a gas conveying sleeve 20a, 20b which is surmounted by a respective plate 19a, 19b, which, in this embodiment, extends substantially orthogonally to the main axis of the respective conveying sleeve 20a, 20b. Each conveying sleeve 20a, 20b and the respective upper plate 19a, 19, together with a corresponding annular gasket (O-ring) 21a, 21b, define the means for attaching thetubular turret 15a, 15b to the respective seat 23a, 23b.

[0057] The conveying sleeve 20a, 20b comprises an open end section that puts the header 12 in fluid communication with the inside of the respective tubular turret 15a, 15b.

[0058] The annular gaskets 21a, 21b, which determine the fluid-tight coupling of every conveying sleeve 20a, 20b to the respective seat 23a, 23b, may be of a known type, for example made of silicone rubber, polyurethane or another material known for this type of component.

[0059] According to a preferred aspect of the present invention, the plate 19a, 19b may have an asymmetrical shape or be non-symmetrical with respect to at least one axis, and the respective seat 23a, 23b may have a shape complementary to that of the plate 19a, 19b, so as to allow each turret 15a, 15b to be coupled to its own seat 23a, 23b only in a predefined direction.

[0060] Alternatively, to facilitate fine adjustment of the orientation of each tubular turret 15a, 15b, the respective plate 19a, 19b can be made circular or in the shape of a regular equilateral polygon, thus allowing the assembler to arrange this turret 15a, 15b in the most appropriate position to align the respective injection nozzle 16a, 16b with the inlet section of the mixing tube 203a,

[0061] The coupling of each tubular turret 15a, 15b to the respective seat 23a, 23b may cause a mechanical retaining constraint, albeit reversible, to be formed, which is for example and preferably achieved by means of elastic interference of complementary parts, so as to create a reversible interlocking constraint. In this case, in the presence of limited dimensional interference between the plate 19a and the walls of the seat 23a, 23b, by¬ inserting the tubular turret 15a, 15b axially into the respective seat 23a, 23b, this type of constraint can be allowed 19b by the elasticity of the plate 19a, 19b and / or of the complementary- walls of the respective seat 23a, 23b.

[0062] It should be noted that the coupling of the tubular turrets 15a, 15b into the respective seats 23a, 23b of the bottom body 13 can also take place by inserting them with no interference, for example by simply laying them on, so as to allow these tubular turrets 15a, 15b to easily slip out of their seats 23a, 23b. In this case, as well as in case of reversible interlocking, removable retaining means such as split pins can be used to prevent the slipping out, for greater safety.Each tubular turret 15a, 15b is preferably inserted along a coupling axis that coincides with or is parallel to the main axis of the tubular turret 15a, 15b itself.

[0063] In particular, in the embodiment shown herein, the coupling of each tubular turret 15a, 15b to the bottom body 13 of the burner base 100 illustrated herein is achieved along a coupling axis which is defined by the shape of the seats 23a, 23b and is parallel or coincident with the main axis of the body of each tubular turret 15a, 15b, and this coupling axis, and accordingly also the main axis of the body of each turret 15a, 15b, is in turn substantially orthogonal to the main axis of the header 12.

[0064] More generally, thanks to the seats 23a, 23b, at least one tubular turret 15a, 15b can be coupled to the bottom body 13 of the base 100 in such a way that the axis of the body of the tubular turret 15a, 15b is incident with respect to the main axis of the header 12. Each tubular turret 15a, 15b shown herein also has an external recess 18a, 18b above the plate 19a, 19b, which is designed to be aligned, once assembled, with a hole 24a, 24b located near each seat 23a, 23b. This allows a shaped split pin 22a, 22b to be used for each tubular turret 15a, 15b, the shaped split pin being inserted from the outside of the base body 13 into the hole 24a, 24b near each seat 23a, 23b and being engaged in the recess 18a, 18b to retain each tubular turret 15a, 15b in place, thus preventing it from slipping axially out of its respective seat 23a, 23b.

[0065] Indeed, the holes 24a, 24b of the bottom body 13 near the seats 23a, 23b and the recess 18a, 18b of each tubular turret 15a, 15b are aligned along an axis, in this case horizontal, which is orthogonal or in any case incident with respect to the main axis A of each tubular turret 15a, 15b and is coincident with the coupling axis of the latter in the respective seat 23a, 23b.

[0066] It should be noted that the use of the split pins 22a, 22b, which can take place both in the case of elastic interference constraint of complementary parts of the tubular turrets 15a, 15b in the respective seats 23a, 23b, and in the presence of a simple laying constraint or any other constraint between the tubular turrets 15a, 15b and the seats 23a, 23b, is not required but is nevertheless preferable in order to avoid accidental disengagement of the tubular turrets 15a, 15b from their seats 23a, 23b.

[0067] In any case, even with the split pins 22a, 22b, the tubular nozzle-holder turrets 15a, 15b originally mounted on the bottom body 13 of the burner base 100 can be easily removedand replaced, since the split pins 22a, 22b can be easily removed and then the tubular turrets 15a, 15b cab be axially pulled out of the respective seats 23a, 23b.

[0068] This allows tubular nozzle-holder turrets of different profiles, and in particular of different sizes (height) or shapes to be quickly and efficiently mounted on the same bottom body 13 of the burner base 100 alternately, making it easy to adapt this burner base 100 for use with different injection nozzles 16a, 16b and, especially, with burner heads 200 and mixing tubes 203a of different configurations and spatial arrangements. At the end opposite that of the conveying sleeve 20a, 20b, each tubular turret 15a, 15b comprises a housing 17a, 17b for the respective injection nozzle 16a, 16b, so as to put the latter in fluid communication with the hollow inside of the respective tubular turret 15a, 15b and thus allow the fuel gas to flow from the header 12 to the outflow hole of each injection nozzle 16a, 16b.

[0069] The housing 17a, 17b of each tubular turret 15a, 15b may be of the type that allows the respective injection nozzle 16a, 16b to be replaced, for example by unscrewing and screwing it, in this case by means of threaded constraining means (visible in Figure 5). Preferably, the axis B along which the housing 17a, 17b of each tubular turret 15a, 15b extends, coincides with, or is parallel to, the axis of the outflow hole of the respective injection nozzle 16a, 16b, i.e. the direction followed by the fuel gas flowing out of the respective injection nozzle 16a, 16b.

[0070] In the embodiment shown herein, the housing 17a, 17b of each tubular turret 15a, 15b has a main axis B substantially orthogonal to the main axis A of the body of the tubular turret 15a, 15b, so as to identify an L-shaped path for the fuel gas. In particular, when the burner 1 is assembled and in use, the axis B of every housing 17a, 17b is substantially horizontal, whereas the axis A of the body of the respective tubular turret 15a, 15b is substantially vertical. This solution, which involves the respective injection nozzle 16a, 16b delivering a gas jet directed substantially horizontally, allows the burner base 100 to be used with mixing tubes 203a extending substantially horizontally.

[0071] More generally, the axis B of the housing 17a, 17b for the injection nozzle 16a, 16b of each tubular turret 15a, 15b may be preferably incident to the axis A along which the body of the respective tubular turret 15a, 15b extends, so that the fuel gas inside eachtubular turret 15a, 15b follows a broken line path consisting of two segments incident at one of their ends.

[0072] Preferably, this axis B of the housing 17a, 17b for a respective injection nozzle 16a, 16b may be incident to the axis A of the body of a respective tubular turret 15a, 15b by an angle between 0°, where these axes coincide, and 15°.

[0073] The person skilled in the art understands that this type of tubular nozzle-holder turret 15a, 15b can be easily manufactured by molding, and in particular by die casting, or alternatively can be manufactured from a tubular piece made for example by drawing, or from a solid cylindrical piece, by making two holes with incident axes, each of which can be machined from the respective end of the initial cylindrical piece.

[0074] Since each tubular turret 15a, 15b can be removably coupled to the bottom body 13 of the burner base 100 so as to be fluidically connected to the header 12, it is not necessary to drill holes in the outer walls of the header 12 itself to create the fuel gas passage channels leading to the injection nozzle 16a, 16b, when these channels are orthogonal to the axis of the header 12 itself. This way, there is no need to plug the inlet section of the machine that drills these holes (e.g., a milling machine) with sealing balls, for example. On the other hand, it should be noted that any other arrangement of the housing 17a, 17b relative to the body of the respective tubular turret 15a, 15b is obviously permitted. For example, in the case of substantially cylindrical tubular turret 15a, 15b, the axis of the housing 17a, 17b can be arranged to be aligned or coaxial with the main axis of the body of the respective tubular turret 15a, 15b, so that if the axis of the tubular turret 15a, 15b is vertical, the axis of the housing 17a, 17b is also vertical, and therefore of the respective injection nozzle 16a, 16b, thus allowing the use of vertically extending mixing tubes.

[0075] Furthermore, it should be noted that any other configuration of the tubular nozzle-holder turrets 15a, 15b, even if not cylindrical, can be used without departing from the present invention, provided that these tubular turrets 15a, 15b ensure the passage of the fuel gas from the header 12 to the respective injection nozzle 16a, 16b, the latter being spatially arranged in the position required for feeding a respective mixing tube.

[0076] As a result, as mentioned, by simply varying the type of each tubular nozzle-holder turret 15a, 15b to be mounted, the same burner base 100 of the type according to thepresent invention can be easily adapted for use with nozzles of different shapes and sizes, as well as with mixing tubes arranged along different axes, or even with burner heads of different configuration.

[0077] Figure 6 shows a side view of an alternative embodiment of a burner 1’ according to the present invention, which comprises a burner base 100' equipped with a single tubular nozzle-holder turret 15’, which can be removably coupled to the base 100' itself, in exactly the same way as the nozzle-holder turrets 15a, 15b of the base 100 of the burner 1 mentioned above.

[0078] More specifically, the burner 1’ comprises a burner base 100’ surmounted by and coupled to a burner head 200, which in turn is surmounted on top by a top cover 301. The burner head 200' comprises a flame spreader 300’ integral therewith, which contributes to define the side walls of a distribution chamber 202', shaped like a cylinder with a circular base, for the combustible mixture of gas - primary air.

[0079] The head 200' of the burner 1' further comprises at the bottom a (single) mixing tube 203' whose inlet section, or inflow section, faces the outflow hole of a respective injection nozzle 16'.

[0080] The injection nozzle 16' is supported, similarly to the embodiment shown in Figures 1 to 5, by a tubular nozzle-holder turret 15' preferably consisting of a hollow cylindrical body, with a main axis A, which is substantially vertical when the burner 1' is in use. The tubular turret 15' of this embodiment has a housing for the nozzle 15' that is substantially cylindrical with main axis B' substantially orthogonal to the main axis A' of the body of the tubular turret 15'.

[0081] The tubular turret 15' can be removably coupled in a seat 23' of the base 100' of the burner 1’, for example by means identical to those used for every tubular turrets 15a, 15b of the burner 1 shown in Figures 1 to 5, so as to create a fluid path between a fuel gas header 12', with which this burner base 100 is equipped, and the injection nozzle 16'.

[0082] It should be noted that, in this case, the path followed by the gas from the header 12' to the injection nozzle 16' is substantially C-shaped in a sectional view; being understood that the path of the gas in the tubular turret 15' is essentially L-shaped.In this case too, by separately manufacturing a tubular nozzle-holder turret 15' that can be removably coupled to the burner base 100', it is not necessary to drill holes to be plugged, for example by means of a sealing ball, in a surface of the header 12' in order to make the passages that lead the fuel gas from the header 12’ itself to the injection nozzle 16'.

[0083] Furthermore, this embodiment of the tubular nozzle-holder turret 15’, which can be removably coupled to the base 100’ of the burner 1', provides a high degree of flexibility in the configuration of the burner 1', as already discussed with reference to the embodiment shown in Figures 1 to 5.

[0084] The assembling of the burner base 100, illustrated herein in Figures 1 to 5, is carried out according to the following steps:

[0085] inserting a respective annular gasket 21a, 21b into each seat 23a, 23b of the bottom body 13 of the base 100,

[0086] mounting, by screwing, predefined injection nozzles 16a, 16b in the respective housings 17a, 17b of each tubular turret 15a, 15b;

[0087] inserting, in this case axially, the conveying sleeve 20a, 20b and engaging the respective plate 19a, 19b of every tubular turret 15a, 15b in the respective seat 23a, 23b of the bottom body 13, preferably by elastic retention constraint. Due to the configuration of the parts involved, this involves aligning the recess 18a, 18b of each tubular turret 15a, 15b with the holes 24a, 24b drilled in the bottom body 13 near the same seats 23a, 23b. It should be noted that the holes 24a, 24b and the recesses 18a, 18b are aligned on a plane that is positioned above the plane on which the respective annular gasket 21a, 21b is arranged in the respective seat 23a, 23b, so as not to jeopardize the fluidic seal of the coupling of each tubular turret 15a, 15b to its seat 23a, 23b;

[0088] inserting the split pins 22a, 22b into the holes 24a, 24b of the base body 13 and into the recesses 18a, 18b of the tubular turrets 15a, 15b, to prevent each tubular nozzle-holder turret 15a, 15b from accidentally slip out axially.

[0089] Obviously, in order to replace a tubular turret 15a, 15b, the respective split pin 22a, 22b has to be simply removed and this tubular turret 15a, 15b has to be pulled axially out ofthe respective seat 23 a, 23b in the bottom body 13, then it has to be replaced as shown in the diagram above.

[0090] If an injection nozzle 16a, 16b of a tubular turret 15a, 15b simply needs to be replaced, that injection nozzle 16a, 16b simply needs to be unscrewed, or otherwise removed, from its housing 17a, 17b and replaced with another injection nozzle of the same size and, in this case, the same thread as the removed injection nozzle 16a, 16b.

[0091] This confirms the simplicity of assembling and flexibility of use of the base 100 of the burner 1 according to the present invention.

[0092] It will be clear to those skilled in the art that the assembling of the burner 1' in Figure 6 can follow an assembling process substantially identical to that outlined herein with reference to the burner 1 in Figures 1 to 5, thus obtaining the advantages highlighted herein.

[0093] As mentioned, and as will be clear to those skilled in the art, the burner 1 in Figures 1 to 5 according to the present invention, as well as the burner 1' in Figure 6, are particularly suitable for use in cooktops or stand-alone cookers.

Claims

Claims1. Partially-aerated gas burner (1; 1') comprising a burner base (100, 100') having at least one header (12; 12') for a fuel gas, at least one gas mixing tube (203a, 203b; 203') to mix the gas with primary air, a burner head (200; 200’) equipped with at least one distribution chamber (202; 202') for the combustible mixture, and at least one flame spreader (300; 300') fluidically connected to said at least one distribution chamber (202; 202'), characterized in that the burner base (100; 100') comprises at least one seat (23a, 23b, 23') for removably coupling at least one tubular turret (15a, 15b; 15’) supporting an injection nozzle (16a, 16b; 16') for the fuel gas, said at least one seat (23a, 23b; 23') being fluidically connected to said at least one header (12, 12') and said at least one tubular turret (15a, 15b; 15') being fluidically connected both to said at least one seat (23a, 23b; 23'), and to said respective injection nozzle (16a, 16b; 16'), for the inflow of fuel gas from the header (12, 12’) to said respective injection nozzle (16a, 16b; 16').

2. Gas burner according to claim 1, wherein said at least one tubular turret (15a, 15b; 15') is shaped to engage the respective at least one seat (23a, 23b; 23'), by elastic interference of complementary parts.

3. Gas burner according to claim 1 or 2, characterized by comprising at least one shaped split pin (22a, 22b) to retain said at least one tubular turret (15a, 15b; 15') engaged with the respective at least one seat (23a, 23b; 23'), said at least one seat and said at least one tubular turret being shaped to house and reversibly retain said at least one split pin.

4. Gas burner according to any one of the preceding claims, characterized in that said at least one tubular turret (15a, 15b; 15') comprises a housing (17a, 17b) for the removable coupling of said injection nozzle (16a, 16b; 16').

5. Gas burner according to any one of the preceding claims, wherein the housing (17a, 17b) for the injection nozzle (16a, 16b; 16') of said at least one tubular turret (15a, 15b; 15') has coupling axis (B; B') incident, and preferably substantially orthogonal, to the main axis (A, A') of said at least one tubular turret (15a, 15b; 15').

6. Gas burner according to any one of the preceding claims, characterized in that said at least one seat (23a, 23b; 23') and said at least one tubular turret (15a, 15; 15') aregeometrically shaped for coupling in a predetermined direction of said at least one tubular turret with respect to said at least one seat.

7. Gas burner according to any one of the preceding claims, characterized in that the path of the fuel gas within said at least one tubular turret (15a, 15b; 15') follows a broken line of two segments incident at one end.

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