The present invention relates to the field of gas burners with multiple concentric flame rings, and it relates more specifically to improvements to those of these burners that comprise:
Gas burners of the type considered are already known, in particular from document PCT/FR04/00158 in the name of the Applicant.
These known burners have the disadvantage that the annular burner is supplied with an air-gas mixture in a single location of its periphery, so that it does not operate to its optimum.
The object of the invention is to provide a gas burner of this type that is more efficient from the energy point of view, namely more powerful with substantially identical dimensions, while being structurally simple and easy to manufacture and assemble.
To these ends, a gas burner with multiple concentric flame rings such as mentioned in the preamble is characterized, being arranged according to the invention,
By virtue of this arrangement, it is possible to supply a large air-gas mixture flow to the annular burner distributed in several locations of its periphery, so that its operation is optimized as compared with the former arrangement.
Such an arrangement allows complete freedom of choice as to the method of supplying gas. A first possibility of an assembly consists in that said means for supplying gas comprise a single tube situated centrally and connected to all the injectors. The burner is then provided with a single gas supply having a single control (single tap) simultaneously supplying the central burner and the annular outer burner. However, provision can also be made for said gas supply means to comprise a first tube connected to the axial central gas injector and a second tube connected to the lateral gas injectors. Each central burner and annular outer burner has its own gas supply with its own control (two respective taps) so that it is possible to achieve different heating at the center and at the periphery (WOK cooking).
In a preferred embodiment, the burner has a central base positioned coaxially to the central burner and this base comprises
It is then possible to arrange the base according to the type of gas supply selected. In the case of a common supply to the two central and annular outer burners, provision is made for the at least two substantially radial lateral bores of the base to communicate with the central bore and for the base to include additionally a connecting bore communicating with the lower end of the central bore and adapted for receiving the end of a gas supply tube. In the case of two distinct supplies, provision is made for the base to have a first connecting bore communicating with the central bore and adapted for receiving the end of a first gas supply tube and a second connecting bore communicating with said lateral bores and adapted for receiving the end of a second gas supply tube.
In order to preserve a sufficiently flat general configuration for the burner, it is desirable that the convergent-divergent tubular conduits forming venturis are inclined upward in an outward direction.
In this case, it is advantageous for the base to have, at least in its upper part, a substantially truncated conical general shape with a conicity such that the lateral gas injectors are inclined while being substantially coaxial respectively with the convergent-divergent conduits forming tubular venturis.
It is desirable, in order to obtain regular operation, for the convergent-divergent conduits forming tubular venturis to be angularly distributed in a substantially equidistant manner. Advantageously, these convergent-divergent conduits forming tubular venturis are between two and five in number, and preferably in practice three in number mutually separated angularly by approximately 120°.
In a concrete embodiment, the annular outer burner has two annular rings of flame orifices, inner and outer respectively.
Also in a concrete manner, the convergent-divergent means forming venturis interposed between the central injector and the central ring of flame orifices comprise a radial annular divergent component surrounding a central well coaxial with the central injector, so that, in conjunction with the tubular convergent-divergent conduits with a radial span for supplying the annular outer burner, it is possible to produce a gas burner with multiple concentric flame rings that is relatively shallow.
Typically, a gas burner arranged as has just been described may have a power of the order of 7 kW, while keeping approximately the transverse dimensions of a current burner with a power of the order of 5 kW.
Another valuable feature of the burner arranged according to the invention lies in the possibility of preserving a structural formation similar to that of former burners with a reduced number of constituent parts, such a burner comprising:
In this case, the burner arranged according to the invention is characterized in that
In this case, according to a preferred embodiment, provision is made for:
The design of the pot may, for its part, give rise to two possible embodiments according to the general design of the cooking appliance.
A first design consists in that the pot has a solid structure and in that at least the pot and/or the head have/has at least two substantially radial grooves, interposed between said gutters, which that extend while emerging between said central area and the outer edge of the pot or head respectively, these grooves being closed by the head or pot respectively in the assembly position of said pot and head in order to constitute passages with a generally radial span adapted for ensuring the supply of primary air from above the upper plate of the cooking appliance. In this case, it is advantageous to provide that:
Another design consists in that the pot possesses a structure that is perforated at least partially between the gutters and that is adapted for ensuring the supply of primary air from below the upper plate of the cooking appliance.
Advantageously in this case, the gutters of the pot extend as far as below the annular part of the head and the annular part of the head possesses a bottom that is provided with openings facing the ends situated radially toward the outside of said gutters of the pot.
In the case where the injectors are supported on a common base as indicated above, it is of value for the central area of the pot to have a central opening through which said base supporting the injectors is engaged from underneath the pot, with its upper truncated conical part projecting above said central area and with its lower part subjacent to the pot, said lower part being provided with the connecting bore or bores.
In order to facilitate mutual guiding of the pot and head when assembled, and also to ensure their mutual locking in rotation once assembled, provision is advantageously made for the pot and/or the head to have pairs of projecting fingers positioned either side of the respective gutters and adapted for receiving the corresponding gutters of the head and/or the pot respectively.
In the preferred concrete arrangement mentioned above, provision is made for the pot and/or the head to have three substantially radial gutters mutually separated angularly by approximately 120° and three substantially radial grooves interposed between said gutters.
The invention will be better understood on reading the following detailed description of some preferred embodiments given solely by way of non-limiting examples. In this description, reference is made to the appended drawings in which:
Referring first of all to
The central burner 2 comprises:
The annular outer burner 3 coaxially surrounding said central burner 2 comprises:
Finally, the burner 1 has means 14 for supplying gas to said central axial injector 6 and to said injecting means 10, means 14 for supplying gas that will now be dealt with more explicitly.
The arrangement that has just been described leaves complete freedom of choice as to the method of supplying gas. A first assembly possibility consists of said gas supply means comprising a single tube situated substantially centrally and connected to all the injectors. The burner is then provided with a single gas supply having a single control (single tap) simultaneously supplying the central burner and the annular outer burner. However, provision may also be made for said means for supplying gas to have a first tube connected to the central axial gas injector and a second tube connected to the lateral gas injectors. Both the central burner and the annular outer burner have their own gas supply with its own control (two respective taps) so that it is possible to perform different heating at the center and the periphery (WOK cooking).
In this context, in order, at the same time, to simplify the structure of the burner and the assembly of its constituent parts, it is of value for the means 14 for supplying gas to have a central base 16 positioned coaxially to the central burner 2 and arranged so as to support all the gas injectors in their appropriate respective locations. To this end, provision is made for this base 14 to have, as may be seen in
It is then possible to arrange the base 16 according to the type of gas supply selected. In the case of a common supply for the central burner 2 and the annular outer burner 3, provision is made, as shown in
It should be emphasized here that the base 16 is shown in
In order to lead the air-gas mixture to the annular outer burner 8 that is situated substantially above the radial injectors 11, it is desirable to avoid elbowed paths in order to reduce pressure losses. Under these conditions, provision may advantageously be made for the convergent-divergent conduits 13 forming tubular venturis to be inclined upward in an outward direction as may be seen in
In addition, as will be better seen in
In order to obtain a uniform supply of all the annular outer burner 3, it is desirable for the convergent-divergent conduits 13 forming tubular venturis to be angularly distributed in a substantially equidistant manner. In practice, the burner is easily designed and manufactured when the convergent-divergent conduits 13 forming tubular venturis are between two and five in number. A useful compromise consists of having the convergent-divergent conduits 13 three in number, mutually separated angularly by approximately 120°, as illustrated in the figures.
By virtue of the configuration adopted according to the invention, the annular outer burner 3 and the central burner 2 still function substantially independently of each other, since each of them has its own means for supplying an air-gas mixture. On account of this, the central burner 2 may be arranged in any desirable manner that is suitable for requirements. In particular, with a desire to design a shallow burner 1, it is advantageous for the convergent-divergent means 7 forming venturis interposed between the central injector 6 and the central flame ring 5 to include a radial annular divergent component defined by a plate 21 inclined downward in an outward direction and surrounding a central well 22 coaxial with the central injector 6 and by a face 24 opposite a cap 23 covering the central burner body 4, as may be seen in
It is desirable for the burner according to the invention to retain a simple structure while being made of a minimum number of component parts. From this point of view, it is valuable for it to be made in a similar manner to the burner described in document PCT/FR04/00158 already mentioned. To this end, provision is made for the burner described above to comprise, as may be better seen in
In accordance with the arrangement according to the invention, provision is made as follows:
A simple way to implement the provisions that have just been described consists in that:
In this context, it is conceivable for the pot to be designed according to two possible embodiments leading to two different respective operating modes of the burner according to the design of the cooking appliance.
A first embodiment consists, as shown in
A burner is thus formed wherein the primary air necessary for the functioning of the two burners, a central one 2 and an annular outer one 3 respectively, is supplied from above the upper plate of the cooking appliance.
In the specific preferred arrangement shown in
A second embodiment consists, as illustrated in
Independently of the design of the pot, as is better seen in
In order to mount the burners, the central area 33 of the pot 25 has, as may be seen in
In the concrete example of an embodiment illustrated in
As will be better seen in
In order to ensure correct mutual angular positioning of the superimposed pot 25 and head 27, provision is made for means for guiding and locking in rotation that, in the example illustrated, comprise pairs of fingers 38 carried for example by the pot 25 and projecting vertically upward, while being positioned either side of the respective gutters 34i. When the head 27 is mounted, the gutters 34s are each interposed between two facing fingers 38. An inverse arrangement could of course be adopted, with the projecting fingers carried by the head either side of the gutters 34s.
It will be emphasized that an electrical ignition electrode 39 and/or a thermocouple 40 for detecting the presence of flames may, if desired, be installed in the burner 1, in any suitable location thereof. As an example, the ignition electrode 39 and the thermocouple 40 are shown in the outer edge of the pot 25 in
If it is desired to have two distinct supplies available for the central burner 2 and annular outer burner 3 respectively, provision is made, as shown in
In the design of the base 16 illustrated by way of example in
For their part, the bores 18 of the radial injectors 11 of the annular outer burner 3 are connected by a channel 43 situated axially to a second connecting bore 44 which here also is situated laterally at the bottom of the base 16 and is extended substantially radially.
Thus arranged, the base 16 is a relatively complex part with many emerging perforations of which some should then be closed (stoppers 45) so as to constitute suitable channels.
Number | Date | Country | Kind |
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05 08166 | Jul 2005 | FR | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/FR2006/001844 | 7/27/2006 | WO | 00 | 1/29/2008 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2007/012766 | 2/1/2007 | WO | A |
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