EP3384208A1

EP3384208A1 - Gas burner with multiple rings of flames having two parallel venturis, one above the other

Info

Publication number: EP3384208A1
Application number: EP15807963.2A
Authority: EP
Inventors: Christophe Trochou; Fabienne MEREAU; Gilles MONGAY
Original assignee: Nouvele Sourdillon Ste; Soc Nouvele Sourdillon
Current assignee: Nouvelle Sourdillon Ste
Priority date: 2015-11-30
Filing date: 2015-11-30
Publication date: 2018-10-10
Anticipated expiration: 2035-11-30
Also published as: WO2017093615A1; ES2805468T3; US20180347808A1; EP3384208B1; US10551057B2

Abstract

The invention relates to a gas burner with multiple rings of flames, able to be mounted on a hotplate on the top of a cooker, the said burner comprising a central burner (1) and at least one annular burner (3) surrounding the central burner, and a burner body (6) able to be fixed to the said top hotplate (P). The burner body (6) comprises at least a first gas inlet (8) communicating with a first gas injector (9) situated facing a first, convergent-divergent pipe (10) forming a Venturi, the said first pipe (10) having an axis substantially parallel to the said hotplate plane (P1) and being able to supply the said annular burner (3) with an air/gas mixture, and a second pipe (5) forming a Venturi, of axis parallel to the axis of the first pipe (10) situated above the said first pipe (10), the second pipe being able to supply the said central burner (1) with an air/gas mixture.

Description

MULTI-FLAME CROWN GAS BURNER HAVING

TWO PARALLEL VENTURIS, ONE ABOVE THE OTHER

The invention relates to assemblies formed by a top plate of a cooking appliance, especially for domestic use, and to multiple flame crown gas burners which are adapted to be mounted on such a plate.

Such burners generally comprise a central burner and an annular burner, surrounding the central burner.

Such burners are used when a large heating power is required and / or, in conjunction with respective gas supply devices of the central and annular burners, when a modulation of the heating power is required (Asian cooking by example).

Flame rings having a central burner with a peripheral flame crown and an annular burner, surrounding the central burner, provided with one or two crowns of flames: an inner flame crown are already known in particular. and an outer flame crown. The annular burner may also comprise only one outer flame crown.

EP 1 120 603 describes, for example, such burners.

At the origin of the invention, it has been sought to make the assembly described in this document more compact and to further improve the performance of such burners.

Indeed, and even if the document explains that the structure he describes is compact, it has been found that it is not enough to be mounted on a hob whose thickness hardly exceeds 4 cm.

The invention therefore aims to provide a gas burner multiple rings of flames of an improved type, whose structure is suitable to allow its implementation both on a conventional stove on a thin baking sheet (less than 3 cm).

For these purposes, the invention relates to a gas burner with multiple rings of flames, adapted to be mounted on a top plate of a cooking appliance particularly for household use, the top plate extending substantially in a plane of plate, said gas burner comprising: a central burner having a ring of peripheral flames and at least one annular burner having at least one ring of peripheral flames, said annular burner surrounding the central burner,

and a burner body adapted to be fixed on said top plate,

said burner body comprising at least a first gas inlet communicating with a first gas injector located opposite a first converging-diverging Venturi duct, said first duct having an axis capable of extending substantially parallel to said plate plane; said first conduit extending over at least most of a transverse extent of the burner body,

said first conduit being, at its end opposite said first gas injector, in communication with a well substantially perpendicular to said axis of said first conduit, said well being open upwards and able to supply said annular burner with an air / gas mixture.

The burner according to the invention is remarkable in that said burner body comprises a second venturi duct, whose axis is parallel to the axis of the first duct and situated above said first duct, said second duct having an end in communication with an upward opening of the burner body, able to supply said central burner with an air / gas mixture.

Thanks to the adopted structure, a multi-ring flame burner is formed in which the mixture of gas and air jets passing through the first venturi and supplying the external burner head is also used to feed the inner burner head, because the Venturi feeding the inner burner head communicates with the venturi of the outer burner head. This optimizes the occupation space of the burner body. In addition, by horizontally orienting the Venturi supply of the inner burner head, and positioning on one another the two Venturi, limit the occupation height of the assembly, which allows to create sets space-saving, can be mounted on a reduced-thickness baking tray.

Also, by horizontally orienting the Venturi supply of the inner burner head, it is possible to increase the length of the Venturi (and therefore the performance of the inner burner head) without affecting the overall size of the assembly.

The assembly according to the invention may also comprise the following characteristics, taken separately or in combination: the second conduit may comprise a second open end in said well, so that the air / gas mixture of said first conduit also circulates in said second conduit. This allows the use of a single gas supply to supply both central and annular burners.

The burner body may comprise a second gas inlet communicating with a second gas injector situated opposite the second Venturi duct, the second gas injector being positioned at a second end of said second Venturi duct, said second end being opposite; at said end in communication with the upward opening of the burner body, said second gas injector being oriented parallel to said first gas injector.

The central burner and the annular burner may each respectively comprise a central burner head and an annular burner head and, respectively, a central burner cap and an annular burner cap.

- The central burner head and the annular burner head can be made in one piece. This facilitates the mounting of the burner.

- The central burner head assembled to the burner body may form a corridor parallel to the axis of the first and second ducts forming Venturi, the corridor may have a corridor inlet formed by the upward opening of the burner body and a corridor outlet opening substantially in the center of the central burner head.

Upstream of the second Venturi duct, the burner body can form with the central burner head, an air inlet chamber around said second gas injector.

Said second gas inlet may open into said air inlet chamber in the vicinity of said second gas injector.

The annular burner head may comprise an annular chamber bordered at least one-laterally by flames passages and having at its bottom an opening in communication with said well. In addition, the central burner head may include a central burner chamber having an opening adapted to communicate with the upward opening of the burner body.

In the vicinity of said at least one first gas inlet, the burner body may comprise an air inlet opening in the vicinity of the inlet of said first Venturi duct. The annular burner may be inferiorly surrounded by a peripheral skirt inclined downwards, the peripheral skirt being preferably made removable.

The burner may comprise at least one flame detection thermocouple and / or at least one electric ignition element and said at least one thermocouple and / or said at least one electric ignition element may be functionally associated with the central burner .

The invention also relates to an assembly comprising at least one gas burner as defined above and a cooking plate.

According to an advantageous embodiment, the axis of the first conduit is positioned below the plate plane of the hob and the axis of the second duct is positioned above the plate plane of the hob. Thus achieved, the assembly has a much lower occupancy height than known assemblies. According to an alternative embodiment, also, the second duct is enclosed between the cooking plate, on the one hand, and the central burner and the annular burner, on the other hand. With this arrangement, the second conduit is preserved from any introduction of dirt, which facilitates the cleaning of the assembly. According to yet another advantageous embodiment, the assembly comprises at least one primary air inlet located below the plate.

The invention will be better understood on reading the following detailed description of certain embodiments given solely by way of non-limiting examples. In this description, reference is made to the accompanying drawings in which:

- Figure 1 is a perspective view of an assembly according to a first embodiment of the invention;

- Figure 2 is a sectional view of the assembly, according to the plan ll-ll shown in Figure 1;

FIG. 3 is an exploded view of the assembly shown in FIG. 1;

FIG. 4 is an enlargement of part IV indicated in FIG. 3, showing in perspective the burner body of the assembly shown in FIGS. 1 to 3; FIG. 5 is an enlargement of the part V indicated in FIG. 3, showing in perspective the burner heads of the assembly shown in FIGS. 1 to 3;

FIG. 6 is a perspective view of an assembly according to a second embodiment according to the invention, FIG. 7 is a longitudinal sectional view along the plane VII-VII shown in FIG. 6, and FIG. 8 is a cross-sectional view along the plane VIII-VIII shown in FIG.

In the following description, the terms "lower", "upper", "high", "low" etc. are used with reference to the drawings for greater ease of understanding. They should not be understood as limitations of the scope of the invention.

Reference will first be made to a first embodiment illustrated in FIGS. 1 to 5.

The second embodiment illustrated in FIGS. 6 to 8 will be described later.

Referring first to Figure 1, the assembly includes a gas burner having an inner burner head 1 (or central burner), which is centrally located, having a peripheral flame crown (flame passages 2 ) and at least one outer burner head 3 (or ring burner), which is annular and remotely surrounds the central burner head 1, having at least one ring of flames, inner and / or outer. In the example illustrated in all the figures, the annular outer burner head 3 has an outer flame ring (flame passages 4).

It should be noted that the two embodiments illustrated and shown in FIGS. 1 to 8 comprise the same burner heads 1 and 3.

Moreover, in the two embodiments that are presented, the inner and outer burner heads 1 and 3 are made in one piece. This has the advantage of reducing the number of parts in the assembly according to the invention. The inner and outer burner heads 1 and 3 thus forms a single piece which, through a burner body 6, is adapted to be mounted on a cooking plate P. The cooking plate P is, for example a cooking plate or a hob. It is visible in the drawings of Figures 1 to 3. The plate P extends substantially along a plate plane P1.

The burner body 6 is visible in particular in Figures 1, 2 and 4. This burner body 6 here has a relatively elongated shape, substantially in correspondence with the diameter of the outer burner head 3 which overcomes said body.

The burner body 6 is arranged to be fixed, by fixing means, at least partially under the top plate P of a cooking appliance. FIG. 4 shows in particular that the burner body 6 is bordered, at least partially substantially at mid-height, by a fastening flange 70, having punctures 71 occasionally.

The plate P has a cutout 72 corresponding substantially to the shape of the section of the burner body 6, to accommodate the burner body 6 (Figure 3).

Holes 73 are also made around the cut 72. Some holes 73 are in vertical correspondence with the holes 71 of the flange 70 of the burner body when the latter is positioned in the cut 71 of the plate p. Fastening means, such as nuts and screws (not shown) placed in the holes 71 and 73, ensure the attachment of the burner body 6 to the plate P.

At one end of the burner body 6 is a gas inlet 8, connectable to a gas supply via control means (not shown) which preferably are clean.

As seen in Figure 2, the gas inlet 8 is in communication with a gas injector 9 located coaxially facing an end of a conduit 10 first convergent, then diverging and forming a tubular Venturi, which extends substantially over most of the length of the burner body 6, that is to say the diameter of the outer burner head 3, along an axis parallel to the plane P1.

Between the gas injector 9 and the conduit 10 is a light 1 1 of primary air intake. The primary air inlet lumen is supplied with air through a through opening 80 and / or through the opening 81 made through the burner body 6, in the vicinity of the gas injector 9.

More specifically, in the context of the illustrated example, the burner body 6 is made in two parts assembled together. A first portion 60 which includes the conduit 10 and a portion 61 which comprises a receiving housing for the injector and which is assembled at one end of the portion 60, opposite the inlet of the conduit 10. The arrow F on Figure 4 shows where to position the workpiece 61 relative to the workpiece 60 to assemble them together. FIG. 2 shows that the end 62 of the piece 60 fits into the end 62 of the piece 61.

It should be noted that parts 60 and 61 could be made in one piece.

At its end end, the conduit 10 is connected to a substantially vertical well 12 bringing the air-gas mixture into the external burner head 3.

As can also be seen in FIG. 2, the burner body 6 comprises a second tubular Venturi duct 5, which extends parallel to the duct 10, also substantially over a portion of the length of the burner body 6. The second duct 5 5 is disposed above the duct 10 and in the opposite direction: the inlet 50 of the duct 5 is made from the well 12 and the outlet of the second duct 5 is through an opening 51 made on the top of the duct 5, in the vicinity of its end 52 opposite the end 53 having the inlet 50 of the second duct 5. Thus produced, the second conduit 5 communicates with the well 12 and the air / gas mixture circulating in the conduit 12 is also caught in the second conduit 5 in which it also circulates.

The outlet opening 51 of the second duct 5 opens into a passage 54 which opens out substantially at the center 59 of the central burner head 1, which makes it possible to drive the air / gas mixture into the central burner head 1.

It should be noted that, in an alternative embodiment, there could be several outlets 51 which would end in the corridor 54.

Reference will now be made more particularly to the inner and outer burner heads 1 and 3 with reference to FIGS. 1, 2, 3 and 5.

The outer burner head 3 has an annular chamber 22 located in the vicinity of the outer periphery of this head. The chamber 22 is formed by a channel defined by a bottom 23 and two concentric side walls 24, 25 and a lid or annular cap 26 capping said channel (Figure 1). In the wall 25 are formed notches forming flames passages 4.

In the illustrated example, the notches forming the flame passages are of different depths to allow better combustion and a non-brittle flame crown.

As visible in particular in Figure 5, the bottom 23 of the chamber has an opening 27, which is positioned opposite the substantially vertical well 1 1 (above) of the burner body 6 when the assembly is assembled (Figure 2).

As can be seen in particular in FIG. 2, the annular cap 26 is guided, when it is put in place, and retained in position by positioning fingers 28 integral with the external burner head 3.

As in Figure 5, the outer burner head 3 is arranged so that between a central region which will be discussed later and the chamber annular 22, it comprises lights 29 which open this intermediate annular zone.

Finally, the outer burner head 3 is integral with the central burner head 1 at least via bridges 31 made between the central burner head 1 and a positioning finger 28, integral with the concentric side wall 24 of the external burner head 3.

More specifically, the central inner burner head 1 has a central region, which has a central opening 34.

The central opening coincides with the outlet of the passage 54 mentioned above, which makes it possible to guide the air / gas mixture leaving the second duct 5 towards a central region of the central interior burner head 1.

Specifically, the passageway 54 is partially formed by the top of the burner body 6 having projections, and partially by a portion of the central burner head connected to the burner body 6. Figure 4, illustrating the burner body 6 , shows a protruding portion in the form of rectangle 55 provided on the upper part of the burner body 6.

Within the space delimited by the protruding portion in the form of a rectangle, is the end 51 of the outlet of the second duct 5 forming Venturi.

The solid bottom 56 of the interior space delimited by the rectangle-shaped protruding portion 55 is formed by the wall of the burner body and is situated substantially at the same level as that of the outlet end 51 of the second duct 5.

The solid bottom 56 forms the bottom of the corridor 54.

The side walls of the passage 54 are formed in part by the rectangle-shaped protruding portion 55, and by the side walls of a parallelepiped shaped hollow portion 57 which connects the side wall 24 of the outer burner 3 and the inner burner 1 . Thus, when the central burner head (or inner) 1 is assembled to the burner body 6, the passage 54 is formed between the rectangle-shaped projection portion 55 and parallelepiped-shaped hollow portion 57.

The corridor 54 has an axis parallel to the axis of the first and second conduits 10 and 5 (respectively) and comprises:

a corridor inlet, made by an opening towards the top of the burner body 6 corresponding to the outlet of the second duct 5, and

- A corridor outlet, which opens substantially in the center of the central burner 1, so that the air / gas mixture from the well 12 is delivered to the center of the internal central burner 1.

The central burner head 1 comprises a peripheral wall 35 which is pierced with notches 2, of different depths, forming flames passages (see FIGS. 3 and 5 in particular). A cap or cover 36 rests on the wall 35 (see FIG. 1). Finally, it will be noted that the outer burner head 3 is, as is often the case for gas burners, lined internally by a peripheral annular skirt 38 inclined downwards. This skirt may be an integral part of the burner head 3, or may be an annular piece removably attached to the burner head 3: this annular piece 38 may be implemented by appropriate shoulders, for example.

In addition, it then becomes easy to conform and / or decorate the annular piece in various ways to meet such commercial requirements.

The structural arrangements which have just been described lead to a multi-crown gas burner whose burner heads 1 and 3 operate only with a single gas inlet. By making two Venturi ducts communicate with each other, it is possible to feed two different burner heads. By arranging the two parallel Venturi ducts one to the other and one above the other, parallel to the plane P1 of the plate P, the burner body occupies a space limited in height and width.

It will also be noted that the burner body 6, when attached to the plate P, occupies a space above the plate P and a space below the plate P, which further reduces the bulk of the body Burner under the plate P and allows to install the burner body in very small spaces as, for example, under a baking sheet of reduced thickness (less than 3 cm).

In Figure 2, is shown diagrammatically by the arrows F1 the path followed by the primary air, since the opening 80 (air from below the cooking plate P) or from the upper end of the intake port primary air 1 1 (air coming from above the cooking plate P) reaches the inlet of the duct 10 and simultaneously, passing through the well 12 and reaches the level of the duct 5. As for the secondary air that must reach At the foot of the flames, his journeys are represented by the arrows in indents F2. It comes partly from the outside of the burner for the ring of external flames, and outside air coming through the openings 29 (arrows F3) for the ring of internal flames of the central burner 1. Finally, it will be noted that, to simplify the structure of the burner and reduce its cost, there is provided a single thermocouple Th and / or a single electrical ignition member A I which are then associated in operation with the single central burner.

As can be seen better in FIG. 4, the burner body 6 has housings 74 and 75 in its fastening flange 70 for accommodating, respectively, at least one thermocouple Th and at least one electric ignition element A I.

Reference will now be made to a second embodiment shown in FIGS. 6 to 8. The same references have been retained to designate the elements common to the two embodiments.

The second embodiment comprises the same burner heads 1 and 3 made in one piece and the same plate P as the assembly shown in Figures 1 to 5.

It also comprises substantially the same burner body 6, since it comprises in particular the gas inlet 8, the injector 9, the two ducts 10 and 5 forming Venturi. However, the burner body 6 of this second example has features that the burner body 6 of the first embodiment does not have and which will be developed now:

As can be seen more easily in FIGS. 6 and 7, the burner body 6 in the second embodiment comprises a second gas inlet 13 distinct from the first inlet 8 mentioned above, and disposed here on the side of the body 6, perpendicular to the axes of the two ducts 10 and 5. The gas inlet 13 is connectable to a gas supply via control means (not shown) which preferably are clean and are distinct from the supply control means of the first arrival of gas 8.

It should be noted that the burner body 6 of the embodiment shown in FIGS. 1 to 5 also comprises this second gas inlet. However, the second arrival in the first embodiment is achieved by a blind hole.

It should also be noted that the well 12 of the burner body is not in communication with the second conduit 5 in this second embodiment.

Thus, it will be understood that the burner body 6 of the second embodiment and of the first embodiment can be made by machining the same basic burner body: particular machining operations are thus performed according to whether it is desired to carry out a burner body with one or two gas inlets. In the second embodiment, the gas inlet 13 is in communication with a gas injector 14 which is directed parallel to the second Venturi 5, and therefore parallel to the first gas injector 9: in FIG. the injector 14 is substantially horizontal and substantially parallel to the axes of the ducts 10 and 5.

The gas injector 14 is positioned at one end of the second duct 5 (end forming the inlet 50 of the duct 5), opposite the outlet 51 of the duct 5 (the outlet 5 corresponds to the opening towards the top of the body of the duct 5). burner 6).

The communication between the gas inlet 13 and the second gas injector 14 is made by means of a pipe 15 pierced through the burner body 6, visible more particularly in FIG. 8.

The duct 15 is rectilinear and has a first end 16 open in the gas inlet duct 13 and a second end 17 which opens at the rear of the second gas injector 14 (see Figures 7 and 8). The second gas injector 14 is positioned in a recess 18 made in the burner body 6 upstream of the second duct 5 forming Venturi.

The cutout 18 of the burner body 6 is placed under a second parallelepipedal portion 58 connecting the two burner heads 1 and 3, the second parallelepipedal portion 58 being in the extension of the first parallelepipedal portion 57, according to the diameter of the head of the annular outer burner (see Figure 7).

The second parallelepipedal portion is formed by walls connecting the concentric side wall of the annular outer burner head 3 and the peripheral wall of the central inner burner head 1. Like the first parallelepipedal portion 57, the second parallelepipedal portion 58 is open downwardly so as to form a lid above the cutout 18 made in the burner body 6. The cutout 18 thus accommodates the gas injector 14 and allows an intake of primary air F1 on either side of the injector 14 under the second parallelepipedal portion 58. Thus, upstream of the second duct 5, the body of burner 6 forms a primary air inlet chamber around the second injector 14 through the cutout 18. Furthermore, thanks to the burner body thus produced, the conduit 15 which extends the second gas inlet 13 opens into the chamber air intake in the vicinity of the second injector 14.

Thanks to this second embodiment, the operation of the central burner 1 or the annular burner 3 can be controlled independently.

Claims

Multiple burner flame gas burner suitable for mounting on a top plate (P) of a cooking appliance, particularly for domestic use, the top plate (P) extending substantially in a plate plane (P1) )

said gas burner comprising:

- a central burner (1) having a ring of peripheral flames and at least one annular burner (3) having at least one ring of peripheral flames, said annular burner (3) surrounding the central burner,

- and a burner body (6) adapted to be fixed on said top plate (P),

said burner body (6) having at least a first gas inlet (8) communicating with a first gas injector (9) facing a first convergent-diverging venturi duct (10), said first duct (10) ) having an axis adapted to extend substantially parallel to said plate plane (P1), said first conduit (10) extending over at least the greater part of a transverse extent of the burner body (6),

said first conduit (10) being, at its end opposite said first gas injector (9), in communication with a well (12) substantially perpendicular to said axis of said first conduit (10), said well (12) being open upwards and adapted to supply said annular burner (3) with an air / gas mixture, characterized in that said burner body (6) comprises a second duct (5) forming Venturi, of axis parallel to the axis of the first duct ( 10) and located above said first conduit (10),

said second conduit (5) having an end (52) in communication with an opening (51) to the top of the body of burner (6), able to supply said central burner (1) with an air / gas mixture.

Gas burner according to claim 1, characterized in that the second duct (5) has a second open end (53) in said well (12), so that the air / gas mixture of said first duct (10) also flows through said second conduit (5).

Gas burner according to claim 1, characterized in that the burner body (6) comprises a second gas inlet (13) communicating with a second gas injector (14) facing the second Venturi duct (5), the second gas injector (14) being positioned at a second end of said second Venturi duct (5), said second end being opposite said end (52) in communication with the upward opening (51) of the burner body (6), said second gas injector (14) being oriented parallel to said first gas injector (9).

Gas burner according to one of the preceding claims, characterized in that the central burner (1) and the annular burner (3) respectively comprise a central burner head (1) and an annular burner head (3) and respectively, a central burner cap (36) and an annular burner cap (26).

Gas burner according to Claim 4, characterized in that the central burner head (1) and the annular burner head (3) are made in one piece.

Gas burner according to one of Claims 4 or 5, characterized in that the central burner head (1) connected to the burner body (6) forms a passage (54) parallel to the axis of the first and second ducts (10, 5) forming the Venturi, the passage (54) having a corridor inlet (51) formed by the opening (51) upwardly of the burner body (6) and a corridor outlet opening substantially in the center (59) of the central burner head (1).

Gas burner according to any one of claims 4 to 6, comprising the features of claim 3, characterized in that, upstream of the second Venturi duct (5), the burner body (5) forms with the head of central burner (1), an air inlet chamber (18) around said second gas injector (14).

Gas burner according to claims 3 and 7, characterized in that said second gas inlet (13) opens into said air inlet chamber (18) in the vicinity of said second gas injector (14).

Gas burner according to one of Claims 4 to 7, characterized in that the annular burner head (3) has an annular chamber (22) which is flanked at least one side by side by flames (4) and its bottom (23) an opening (27) in communication with said well (12),

and in that the central burner head (1) comprises a central burner chamber having an opening (59) adapted to communicate with the opening (51) towards the top of the burner body (6).

Gas burner according to one of the preceding claims, characterized in that, in the vicinity of the at least one first gas inlet (8), the burner body (6) has an air inlet opening (80). ) in the vicinity of the inlet of said first Venturi duct (10).

Gas burner according to any one of the preceding claims, characterized in that the annular burner (3) is surrounded below by a peripheral skirt (38) inclined towards the bottom, the peripheral skirt (38) being preferably made removable.

Gas burner according to any one of the preceding claims, characterized in that it comprises at least one flame detection thermocouple (Th) and / or at least one electric ignition element (AI) and in that said at least one thermocouple (Th) and / or said at least one electric ignition element (AI) are operatively associated with the central burner (1).

An assembly comprising at least one gas burner according to any one of the preceding claims and a cooking plate (P).

An assembly according to claim 13, characterized in that the axis of the first duct (10) is positioned below the plate plane (P1) of the cooking plate (P) and in that the axis of the second duct (5) is positioned above the plate plane (P1) of the cooking plate (P).

Assembly according to Claim 14, characterized in that the second duct is enclosed between the cooking plate (P) on the one hand and the central burner (1) and the annular burner (3) on the other.

Assembly according to any one of claims 13 to 15, characterized in that it comprises at least one primary air inlet located below the plate.