CN210267210U

CN210267210U - Atmospheric burner for gas stove and gas stove comprising same

Info

Publication number: CN210267210U
Application number: CN201590001136.2U
Authority: CN
Inventors: 罗萨利诺·乌希; 米凯莱·马尔坎托尼
Original assignee: Tre P Engineering Co Ltd
Current assignee: Tre P Engineering Co Ltd; Tre P Eng Srl
Priority date: 2014-11-20
Filing date: 2015-11-18
Publication date: 2020-04-07
Anticipated expiration: 2025-11-18
Also published as: WO2016079584A2; WO2016079584A3; PL70720Y1; RO201700021U1; ES1214916U; ES1214916Y; DE212015000268U1; PL126383U1

Abstract

The present invention provides an atmospheric burner, characterized in that the injectors, each adapted to serve a respective and dedicated flame generation zone, are connected and fed in succession by a single supply line of fuel gas and are activated by a single control line adapted to serve all injectors and are connected to a push-button panel comprising at least one push-button that can be pressed according to the respective sequence and/or ignition mode of said flame generation zone, and in that said single control line is connected to an electrical control circuit adapted to receive at least the signals coming from the push-button panel and the flame detector through respective cables and to send control signals to the ignition device and to the safety valve, which is located through respective wiring on the single supply line upstream along the injectors.

Description

Atmospheric burner for gas stove and gas stove comprising same

Technical Field

The present invention relates to an innovative power regulation system for atmospheric gas burners with multiple injectors, for gas cookers, in particular for household gas cookers.

Background

Atmospheric burner, in the sense of a burner, in which an air-gas mixture is obtained by the action of a gas supply pressure using the venturi ejector principle without the aid of a fan.

Injectors are very simple, economical and reliable devices, and they are therefore used for mixing air-fuel gas in the burner of gas cookers. Almost all domestic gas cookers currently on the market use atmospheric burners.

In a venturi ejector (hereinafter "ejector"), the pressure energy of the engine fluid at the nozzle at the inlet of the venturi is converted into kinetic energy; a high velocity jet exiting the nozzle induces and drags the induced fluid stream at a lower pressure; the two flows are carried in a venturi tank where they mix and recover part of the pressure; mixing then continues in the split section (which is a venturi diffuser) that recovers additional kinetic energy at static pressure. At the outlet of the diffuser, the fuel gas and the combustion air are substantially completely mixed.

The most common, generally accepted and most traditional solution for making gas burners for gas cookers is the method with a "vertical venturi tube" (hereinafter identified by the abbreviation STD); in recent years, however, alternative solutions to STDs have been developed, particularly burners having a horizontal venturi or "linear" configuration, referred to herein as a "LIN".

This configuration comprises a venturi tube with a perfectly linear development arranged horizontally and parallel to the gas burner (in contrast, in an STD burner, the STD diffuser is instead radial). The linear diffuser opens into another mixing chamber (mixing chamber) occupying the internal volume of the burner, where the mixing of the primary air and fuel gas continues and completes. Fig. 2c shows a cross-sectional comparison of the two types.

The regulation of the fire of an STD or LIN burner is generally carried out by means of a manual rotary valve, which is used to regulate the flow of fuel gas upstream of the venturi injector (hereinafter referred to simply as "regulating valve"); by continuously reducing the supply pressure of the injector, a continuous regulation of the fire power between a minimum value of rated power and 100% can be obtained.

As is known, each regulating valve of each burner locks and seals on the "ramp tube" (also called "manifold") of the fuel gas supply circuit of the gas range, and usually also carries a safety valve, which is directly connected to a thermocouple (flame sensor), keeps it in the open position when the flame is ignited, and releases it to its "normally closed" position when it is closed (see fig. 1).

301	Inclined tube	342	Cup-shaped structure	230	Grid (C)
						312	Regulating valve	212	Main body (radial Venturi tube)	120	Control knob
332	Gas pipe	217	Flame spread (split)	147	Control unit igniter
						320	Oil sprayer	220	Cover	160	Igniter
303	Air inlet joint	100	Aesthetic stove

Upon ignition of the burner, an external mechanical action (typically the pressure before rotation of the control knob of the burner) forces the safety valve from its "normally closed" to an open position.

In the case of linear motion safety valves with special seals (gaskets), the regulating valve ("tap") is a plug valve in which the seal is ensured by the presence of grease in the gap between the rotary element and the valve seat, these elements being generally made by removing debris from a brass or aluminium blank; not suitable for use as a safety device.

As is well known in the years, there are burners (also called "special burners" or "multiple injectors") equipped with more than one injector, which respectively feed more than one "flame generating zone" (for convenience, hereinafter simply referred to as "flame zone"), for example a plurality of concentric flame crowns. In fact, said "special burner" is in fact a plurality of burners (usually n ═ 2 or 3, less often 4) comprising "n" injectors, which are usually provided with a number of "special valves" capable of feeding all the injectors of a single burner individually or simultaneously, in a continuous or discontinuous manner.

Each flame crown of a particular burner generally requires a dedicated gas supply line, which develops from the respective particular valve to the injector and, at least in some cases, to the respective igniter (and relative flame sensor) with evident drawbacks in terms of structural complexity and overall dimensions. Even if the adjustment of the power of these special burners is complicated and delicate.

It can be assumed, for example, that it is necessary to manage a STD multi-burner comprising two concentric flame crowns (one centripetal and one centripetal), each fed individually by its own venturi injector and regulated by a single special regulating valve operated by the user through a control knob; starting from the OFF position, the control knob is turned, enabling the innermost flame crown, and when a small unstable angular sector is reached, its fire is continuously adjusted from its maximum value (i.e. the flame crown is fired at full power) to its minimum value, followed by the enabling of the outer flame crown with the concomitant closing of the inner flame crown. Continuing to rotate the knob, observing a gradual decrease in the fire of the outer flame crown until a second unstable angular sector is reached; the rotation is maintained and then the two concentric flame crowns are simultaneously activated, making it possible to continuously adjust from 100% of rated power to 0%.

The modulation curve generated by this typical management of a particular burner is partially continuous and clearly non-linear, as can be clearly seen in fig. 3a, in which the horizontal axis represents the rotation angle of the particular valve control (specific valve control) and the vertical axis represents the corresponding fire power of the burner; three operating regions of the particular burner should be noted. This adjustability of the power may be excessive compared to the actual need, but also sufficient for a discrete adjustment with a sufficient number of "steps" (see fig. 3b) in the electric cooking appliance, which may not be intuitive and not always easy to understand in its implementation, especially for inexperienced users.

There is also a need for the burner to increase safety against fuel gas leaks found in the event of accidental and sudden shut-down of the flame or malfunction thereof.

Disclosure of Invention

The main object of the present invention is to provide a "special" atmospheric burner suitable for gas cookers, in particular household gas cookers, which at least partially eliminates the drawbacks listed above.

More precisely, the main object of the present invention is to provide a continuous regulation system of the fire power of a "special" household burner with a plurality of injectors, suitable for improving safety against the inadvertent entry of fuel gas into the burner.

According to the invention, an atmospheric burner for a gas range comprises:

-a plurality of adjacent flame generating zones,

-a plurality of injectors adapted to mix combustion air and fuel gas, said injectors serving said plurality of flame generating zones,

-a plurality of injectors for supplying said fuel gas in said injectors, each injector being placed at the inlet of a respective injector,

identifying, in the plurality of adjacent flame-producing zones:

-a primary flame zone equipped with an ignition device and an associated flame detector and fed by a respective injector of said plurality of injectors, said primary flame zone being fed first;

-another one or more flame generating zones, each supplied by a respective one of said plurality of injectors, said another one or more flame generating zones being sequentially supplied and activated one after the other;

each pair of flame generating zones comprises a main one, which are fed in succession, adjacent to each other, in such a way that, after activation of said main flame zone, none of the flame generating zones is electrically powered and activated without at least one of the successive flame generating zones having been ignited;

it is characterized in that

Said injectors each adapted to serve a respective and dedicated flame generation zone of said atmospheric burner:

-connected and fed in succession by a single supply line of said fuel gas;

-activated by a single control line adapted to serve all injectors of said plurality of injectors and connected to a push-button panel comprising at least one push-button that can be pressed according to a respective sequence and/or ignition pattern of said flame generation zone of said atmospheric burner;

and lie in

The single control line is connected to an electrical control line:

-adapted to receive signals from at least said button panel and said flame detector through respective cables;

-sending control signals to said ignition device and to a safety valve through respective wiring (located along said single supply line upstream of said plurality of injectors).

Another object of the present invention is to provide a simplification and a reduction of the overall dimensions of the supply and control lines of the burner of a gas range, preferably a "special burner".

According to the invention, a gas burner comprising two or more burners according to the invention is characterized in that it comprises at least two safety levels against fuel gas leakage.

Another object of the invention is to achieve the previous object by means of an innovative pneumatic or electronic or electromechanical control.

It is another object of the present invention to control and manage the ignition of multiple flame zones of a particular burner by a single igniter and flame sensor.

The said objects are achieved by the control and management system of a particular burner of the present invention, in particular the possibility of discrete and intuitive adjustment of its fire, even for users with little experience, which is easy and straightforward to understand. The presence of a single fuel gas supply line and a single control line for all the injectors also allows considerable constructive simplification of the gas burner implementing said special burner, with undoubted advantages even from an economic point of view. The use of a fuel injector integrated with the relative shutter device, which is normally closed in the event of a burner shutdown or accidental flame shutdown, ultimately ensures an additional level of safety against fuel gas leakage and escape.

Drawings

Further characteristics and advantages of the invention will be better highlighted by the following description of an atmospheric burner for gas cookers, represented in possible variants according to the main claim, according to the dependent claims, and illustrated by way of non-limiting way and with the aid of the table of the accompanying drawings, in which:

fig. 1 schematically shows a conventional layout of a gas burner and a safety valve according to the prior art.

Fig. 2a shows in a graphical illustration arrows symbolizing the different titres and inflow rates used by way of example for an air-gas mixture, without any intention to provide quantitative data in the other figures;

figures 2b and 2c schematically show a typical venturi injector for atmospheric burners according to the prior art, and a comparison between a burner with a horizontal venturi configuration and a burner with a vertical venturi configuration, respectively;

figures 3a and 3b show the modulation curves of the fire power of a conventional burner and of a "special burner" according to the invention, respectively;

figures 4a, 4b, 4c, 4d, 4e, 4f and 4g schematically show a "special burner" and the relative feeding and control system according to different variants of the invention;

figure 5 shows the ignition and modulation diagram of the fire power of the "special burner" of figure 4 a;

figure 6 shows the ignition and modulation diagram of the fire power of the "special burner" of figure 4 c;

figure 7 shows the ignition and modulation diagram of the fire power of the "special burner" of figure 4 d;

figures 8a, 8b, 8c and 8d show, in a plurality of cross-sectional views, a component of the control line of the "special burner" of the invention;

figures 9a, 9b, 9c and 9d show, in section and according to possible variants, the power and modulation buttons of the fire power of the "special burner" of the invention;

figure 10 shows a gas burner implementing a plurality of "special burners" according to a first variant of the invention;

figure 11 shows a gas cooktop implementing a plurality of "special burners" according to a second variant of the invention;

figure 12 shows a gas cooktop implementing a plurality of "special burners" according to another variant of the invention;

figure 13 shows a gas cooktop implementing a plurality of "special burners" according to another variant of the invention;

fig. 14 shows a gas burner implementing a plurality of "special burners" according to a last variant of the invention.

Detailed Description

Unless otherwise stated, any possible spatial reference in this report, such as vertical/horizontal or lower/upper terms, refers to the position in which the element is located in the drawing, while spatial terms such as previous/subsequent, upstream/downstream should be understood with reference to the direction of circulation of the air flow.

Arrows are drawn in fig. 2a, each arrow representing a mixing flow at a different speed and titer. These arrows are used in many subsequent figures for illustration and are not intended to provide quantitative indications, as well as the actual state of air, gas, and mixtures thereof at various points upstream, downstream, and within the illustrated combustor.

Perfect scaling need not be described in the figures for the purpose of highlighting certain features but not others.

In addition, the drawings show only the essential elements for the purpose of the invention.

In the drawing (see for example fig. 4a) of a domestic atmospheric burner 1 of the invention, it is shown that an air-fuel is defined thereinCup-shaped structure 14(cup 14) of gas mixing chamber, "n" multiple continuous flame generation zones FL_nEach served by its own "venturi" injector ej.n adapted to the above-mentioned mixing and at its inlet where the respective injector inj.n for feeding fuel gas is placed.

As is known (see for example fig. 2b), each "venturi" injector ej.n comprises a first convergent section 10 (or simply "convergent"), in which the pressure energy of the fuel gas at the injector inj.n is converted into kinetic energy, and in which the combustion air flow is carried by said high-speed fuel gas jet; a groove 11 in which fuel gas and combustion air are mixed and a part of pressure energy is recovered; a final flow-splitting section 12 (also referred to as a venturi "diffuser 12") along which the mixture continues and in which additional kinetic energy is recovered at static pressure.

Although in the figures an injector ej.n of STD type (i.e. with a "vertical venturi tube" as already expected) is shown, it could also be of LIN type, i.e. with a "horizontal venturi tube", or in any case arranged around the body of the burner, for the purposes of the present invention.

Further, although not specifically illustrated, a flame zone FL supplied by the injector ej.n_nThere may be multiple concentric flame crowns, or have other shapes, as long as they are continuous, from each to all subsequent (e.g., without any limiting intent, four concentric flame crowns or a continuous "bank of grooves" FL)₁，FL₂，FL₃，FL₄)。

In at least one flame zone FL_nHereinafter referred to as primary FL₁A known ignition device IGN (also called "igniter IGN"), for example of the piezoelectric type, is provided.

The continuous flame zone FL_nAdjacent to each other such that there is no at least one adjacent flame zone FL_nIn the ignited case, none (except the main FL which can be seen)₁) Can be supplied and activated by its own dedicated injector ej.n.

In this way, the pilot flame function of remaining open and systematically propagating the flame to all the slots of the conventional burners STD and/or LIN is again proposed.

By ensuring flame zone FL_nAlso avoids the need to use one flame sensor FD for each flame zone FL_nA plurality of flame sensors FD.

For the special burner 1 of the invention, therefore in the flame zone FL₁Only one flame sensor FD, referred to herein as "primary", is provided, from which it can be seen that an igniter IGN has been provided.

For simplicity of explanation, the flame sensor will hereinafter be referred to as "flame detector FD".

The fire power of this special burner 1 (also referred to as "multi-injector burner 1") is only the flame region FL that is activated simultaneously_nAs a function of the number of.

In other words, when there is only the primary flame zone FL₁The burner 1 is activated with a minimum power P_minOperate while in all flame zones FL thereof_nReaches its maximum power P when simultaneously enabled_max。

It is clear that, in the case where the injectors ej.n are identical to each other, the modulation ratio Y of the particular burner 1 (known to be equal to the ratio between its maximum and minimum power) will be equal to the flame zone FL_nThe total number of (c). Obviously, for the purposes of the present invention, it is possible to provide injectors ej.n, even if different from each other.

Furthermore, reference numeral 2 designates a push-button panel comprising at least one push-button 20.n for activating said specific burner 1 and for its power regulation.

As will be seen, said push-button panel 2 may be of electromechanical or electronic or pneumatic type and is connected to the injectors inj.n of a particular burner 1 by at least one

control line

3, 3. n.

More precisely, according to the invention, a single control line 3 may be provided, adapted to serve all the injectors inj.n of the burner 1 (see fig. 4c, 4d, 4e, 4f), or alternatively, as shown in fig. 4a or 4b, a number of dedicated control lines 3, 3.1.. 3.n may be provided in the same number as said injectors inj.n (i.e. one control line for each injector inj.n).

Said at least one control line 3.n can be connected directly to at least one push-button 20.n of said push-button panel 2, or according to some variant (of the electrical type) to an electrical control line CMD able to receive a specific control signal from the same push-button panel 2 (as will be seen, said line CMD can also receive a signal from the flame detector FD and send a second signal to the igniter IGN and to the valve of the burner 1, this being called "safety SV").

From here on, the push button panel 2 and at least one injector inj.n control line 3 assembly shall be referred to as the "control system" of the combustor 1.

Different types and architectures of the control system 2 will be briefly referred to the description of some preferred and functional embodiments thereof.

Although the button panel 2 described is shown in the figures of the type comprising at least one mechanical button, it is not intended for any complete description, but it is also possible to provide rotary or linear potentiometers or any other type of control known to the manufacturers and designers of gas cookers.

Furthermore, according to the invention, a single gas supply line 4 (also called "inner wire take-up 4") is used for the integral multiple injectors inj.n of a particular burner 1, arranged in series with one another.

Said supply line 4 is closed by a known and conventional safety valve SV which prevents gas leaks that are found in the event of accidental and sudden shut-off of the flame or of a malfunction of the burner 1.

As clearly shown in the figures, said safety valve SV is located upstream of the plurality of injectors inj.n of the particular burner 1.

Even if well known to those skilled in the art, it is useful to specify that said safety valve SV (for example an electric actuator) is guided by the push-button panel 2 of the burner 1 to switch from the "normally closed" to the "open" configuration, suitable for the passage of fuel gas, and remains long until the above-mentioned flame detector FD senses at least one active flame zone FL_n. In contrast, the absence of such a signal will certainly beThe safety valve SV is closed constantly and then the supply line 4 is closed, thereby interrupting the supply of the fuel gas to the special burner 1.

Suitable and known

electric wires

50, 51 connect the safety valve SV and the flame detector FD, respectively, to the push-button panel 2, while the electric cable 52 controls the ignition of the igniter IGN.

According to another important aspect of the invention, each injector inj.n of the burner 1 is equipped with a special shutter device 6 (see in particular fig. 8a-8d) which is "normally closed", but which, on command, is able to allow or prevent the discharge of gas towards the respective injector ej.n to activate the opposite flame zone FL_nBut at the same time ensures its passage to the next injector inj.n (with respect to the direction of travel of the gases along the single feed line 4).

The shutter 6 interlocks with the flame detector FD.

Although the shutter device 6 and the fuel injector inj.n are shown as being firmly integrated with each other to form a single valve body in the drawings of the present disclosure, there is nothing to prevent them from being logically and physically separate elements.

According to the invention, each injector inj.n, in addition to feeding the corresponding injector ej.n, also acts as a gas shut-off valve, ensuring further safety against gas leakage into the external domestic environment when the burner 1 is shut down or in the event of accidental flame shut-off. As already expected, the linear shutter in the closed position ensures a better seal of the respective conventional adjustment handle itself.

Even in the event of failure of the safety valve SV, accidental or undesired entry of gas into the burner 1 is prevented by the presence of the shutter device 6, which is normally closed, on the plate of each injector inj.n.

A known electromechanical or pneumatic actuator 7 directs the shutter device 6 from the natural closing to the opening configuration of the fuel injector inj.

Without any intention of exhaustive description, a suitable electric actuator 7 may be of the type comprising a coil (only schematically shown in the figures) which is substantially wound on the shutter means 6 and which is able to convert the electric signal generated and transmitted to it by the push-button panel 2, through the above-mentioned at least one control line 3 (in this case therefore of the electric type), into an electromagnetic field which causes a linear movement thereof.

Obviously, alternatively, nothing prevents the possibility of providing a pneumatic actuator 7 which uses pressurized or depressurized air as energy carrier and is able to move said shutter means 6 by the pressure (or indeed also visible as vacuum) generated acting on at least one button 20.n of the button panel 2, which therefore acts as a suitable volumetric pump.

In both cases, it can be seen that the presence of the static spring of said actuator 7 allows the shutter device 6 to return to its rest position, coinciding with "normally closed", when the electric or pneumatic pulse generated by the push-button panel 2 ceases.

Reference should be made in the description to possible configurations of such actuator 7 and shutter device 6 for each fuel injector inj.n.

The essence of the invention has been outlined, in particular in a burner 1 comprising a plurality of injectors inj.n:

continuous feed from a single feed line 4 for fuel gas

Each adapted to a specific and dedicated flame zone FL for a particular burner 1_nService

-allowing said flame zone FL_nIs assigned to at least one control line 3 connected to a push-button panel 2, said push-button panel 2 comprising at least one push-button 20.n that can be pressed according to a suitable and specific ignition sequence and/or pattern.

Furthermore, the special burner 1 of the invention implements a double safety class (or system) ensuring the prevention of gas leakage in the case of incomplete ignition of the flame or accidental closure of the flame, on the one hand by means of a safety valve SV located by the fuel gas supply line 4 upstream along the same said plurality of injectors inj.n, and on the other hand by each same injector inj.n, which, as seen, acts as a closure valve by means of its respective shutter device 6, said safety valve SV and shutter device 6 being able to close (or remain closed) instantaneously in the absence of a flame signal detected by at least one flame detector FD of the special burner 1.

At this time, a typical ignition sequence of the specific burner 1 as described above will be described.

When the particular burner 1 is ignited (by pressing the associated ignition button) acting on the push-button panel 2, the "normally closed" safety valve SV of the fuel gas supply line 4 is forced open, the shutter means 6 of the first injector inj.l are retracted, thereby opening the gas entry into the corresponding injector ej.1 and activating the zone FL for igniting the main flame₁The igniter IGN of the flame in (1).

Once main flame zone FL₁Combustion starts, the flame detector FD generates a voltage (known as a function of the local temperature reached therein) which keeps the safety valve SV and the injector inj.l in an open position.

Thus, the primary flame zone FL₁Still ignited and, as expected, the particular burner 1 is at its minimum fire power.

In contrast, if the user stops the ignition process before the flame is stabilized, the absence of the flame signal detected by the above-mentioned detector FD causes the simultaneous and instantaneous closing of the safety valve SV and of the injector inj.1, doubly inhibiting the passage of gas to the burner 1.

The adjustment of the fire level of the particular burner 1 of the invention is carried out by successive and incremental activation of the other injectors ej.n and by opening shutter means 6 of the corresponding injectors inj.n, in such a way that each pair of successively fed flame zones FL is associated with a respective pair of successively fed flame zones FL_nAdjacent to each other (see the "step" modulation curve of fig. 3 b).

Although it has already been mentioned, that is to say, said modulation of the fire power of a particular burner 1 is subjected to its flame zone FL_nThis means that the flame zone FL is adjacent_nCannot be supplied and activated by its own dedicated injector ej.n without having at least one adjacent flame zone already ignited; for example, only in the main flame zone FL for the particular burner 1₁After activation, flame zone FL₂Can be started, the subsequent flame zone FL₃、FL₄As well as so.

Similar considerations apply also in the case of a reduced fire of the burner 1, i.e. one or more flame zones FL have to be carried out_nSequential and gradual closing.

Therefore, in summary of the particular burner 1 described so far, it was determined that:

primary flame zone FL₁Equipped with an igniter IGN and an associated flame detector FD, and fed by a respective at least one injector inj.1

One or more further flame zones FL_nEach supplied by at least one respective injector inj.n

Wherein:

first feeding the primary flame zone FL₁

-said additional one or more flame zones FL_nSupplied and activated in a one-by-one sequence

-continuously feeding each pair of flame zones FL comprising a main flame zone_nAnd they are adjacent to each other.

Fig. 4a shows a first version of the control system of the special burner 1 in more detail.

The control system provides a common electromechanical button panel 2 comprising an activatable flame zone FL_nA number of push buttons 20.n, 20.1.. 20.4 equal to, wherein the number of flame zones is smaller than or equal to the number of injectors inj.n of the particular burner 1.

More precisely, each button 20.n is connected to the corresponding injector inj.n or to groups of injectors inj.n by means of an own control line 3, 3.1.. 3.4; therefore, a plurality of control lines 3.n are provided for the flame zones, each of which is equipped with at least one injector inj.n of the particular burner 1 to be managed.

Thus, each button 20.n of the button panel 2 is able to realize a corresponding flame region FL according to the sequence generally described previously_nBy simply using known switching means for electrical signals. As expected, in addition to the corresponding fuel injector inj.n (or, as will be appreciated, the corresponding fuel injector)Group inj.n), at least one of said buttons 20.n of the button panel 2 is also connected to the igniter IGN and the flame detector FD of the special burner 1 and the safety valve SV of the fuel gas supply line 4.

Said button 20.n being a primary flame zone FL suitable for activating the burner 1₁20.1, wherein the flame zone FL is expected₁Is ignited first.

Thus, the pressing of the push-button 20.n will command the opening of the safety valve SV and of at least one main injector inj.1 and simultaneously activate the ignition-capable (by the known spark thus generated) for the main flame zone FL₁The igniter IGN of the air-fuel mixture.

Once the ignition of the burner has taken place and stabilized, repeated and successive pressing of the other buttons 20.n of the button panel 2 will result in a continuous flame zone FL_nWith a consequent increase in the fire power of the same burner 1.

Instead, by pressing the flame zone FL_nAny button 20.n of the ignition of (a) effects a previously activated flame zone FL_nAnd a corresponding reduction in the power of the burner 1, which is not an immediate continuous deactivation.

For example, the closure of the second flame zone FL of a particular burner 1 (previously activated by the push-button 20.2) will be dedicated to the activation of the fourth and last flame zone FL by pressing₄Is implemented (see the position of the "hand" representing the user at point (iv) of figure 5).

The previous operating logic is only an example of the countless possibilities offered by the proposed regulation system and can be safely implemented by ordinary electromechanical devices already available to the skilled person. Even for the electronic variant of fig. 4b, each injector 12.n is controlled by a specific dedicated control line 3; 3.1.. 3.4.. 3. n.

However, according to this constructive variant, said control line 3.n is directly connected to an electrical control line CMD capable of performing the following operations:

receive signals from the push-button panel 2 and the flame detector FD via cables 53, 51, respectively

The control signal is sent to the igniter IGN and the safety valve SV of the fuel gas supply line 4 of the burner 1 through the electric wires 52, 50.

More precisely, according to this variant, the push-button panel 2 can comprise a pair of push-buttons 20.n, symbolized in fig. 4b, connected to said electric control line CMD by means of a first key (+)20.1 and a second key (-) 20.2; thus, the first depression of key (+)20.1 will activate the primary flame zone FL₁While each subsequent depression will result in these successive activations until the desired fire power of the particular burner 1 is reached.

This is referred to as the electrical control line CMD to identify whether the pressure exerted on said push button (+)20.1 corresponds to the first ignition of a particular burner 1 or to increase its power, depending on whether a flame signal is received from the flame detector FD.

In contrast, the electrical control circuit CMD will manage the activated flame zone FL each time the key (-)20.2 is pressed_nUntil the minimum fire power of the burner 1 is reached or it is finally switched off.

In the ignition and power modulation versions of the particular burner 1 mentioned so far, as can be seen, there is always a unique one-to-one connection between each button 20.n of the button panel 2 and the shutter device 6 of each fuel injector inj.n; in fact, as can be seen, each button 20.n of the button panel 2 is connected to a respective injector inj.n by a single and separate control line 3. n. This makes the installation of a plurality of special burners 1 in a gas range rather complex and expensive.

To overcome this problem, a simplified variant of the control system of the particular burner 1 shown in fig. 4c is therefore proposed.

According to this variant, the actuators 7 of the shutter device 6 moving each injector inj.n are connected in series with each other by a single control line 3 in this embodiment of the pneumatic type (just as the injectors inj.n have their own dedicated gas supply lines 4).

Thus, according to this variant, all shutter means 6 of each injector inj.n operate with the same pneumatic pressure, the subsequent pressing function being exerted on the push-button panel 2 of the particular burner 1.

As also clearly shown in fig. 6, according to this variant, said push-button panel 2 can comprise at least one push-button 20.1, called "ignition", suitable for activating the igniter IGN and allowing the safety valve SV to switch from its "normally closed" to "open" position (thus activating the main flame zone FL)₁) And at least one push button 20.2, called "select", which, as intended, acts as a "compression" volumetric pump, adapted to discretely increase the pressure of the control line 3 each time it is repeatedly pressed, so as to continuously activate the continuous flame zone FL of a particular burner 1, in a manner to be described_n。

On the other hand, by pressing and holding the selection button 20.2 all the time, the release hole is opened, so that air leaks from the control line 3, reducing its pressure rapidly and in an alternating manner, as will be described later.

According to this variant, the further safety vent comprises a "normally open" vent solenoid valve DV, communicating with the external domestic environment, which can be guided by an ignition button 20.1 and maintained in the closed position by a flame detector FD.

In the main flame zone FL₁In the absence of flame or in the event of accidental closure, said discharge solenoid valve DV returns to its normally open position, discharging the compressed air and causing the closure of all shutter means 6 of the injector inj.n served by the control line 3; this therefore ensures an additional level of safety for the particular burner 1.

In this regard, a first possible configuration for the injector inj.n and the associated shutter device 6 of the pneumatic control type, illustrated in a plurality of views in fig. 8a-8d, will be described in greater detail and with greater precision.

More precisely, in said injector inj.n: a nozzle 80 and a plenum 81 connected to the fuel gas supply line 4, while the pneumatic chamber 60 in said shutter device 6 is shown in fluid communication with the above-mentioned pneumatic control line 3, and the shutter "pin" 61 can be moved, for example by the above-mentioned pneumatic actuator 7, from the "normally closed" to the "open" position of the nozzle 80 (and vice versa).

The actuator 7 may comprise a pneumatic piston 70 and a mechanically adjustable static spring 71 with a settable preload to hold its piston in a "normally closed" position, for example by means of a threaded ring nut 72 or screw. According to possible variants, said piston 70 may alternatively comprise a known bistable piston.

The seal 62 keeps the pneumatic chamber 60 and the air chamber 81 strictly separated.

The pneumatic chamber 60 adjacent to the plenum 81 of the injector inj.n is under overpressure with respect to the outside environment to avoid discharging fuel gas to the outside (for example in a gas range) in case of damage and/or wear of the seal 62.

By properly managing the pressure level within the pneumatic chamber 60, it is therefore possible to systematically limit or eliminate the pressure gradient between the fuel gas and the fluid (typically compressed air) of the pneumatic control line 3 across the seal 62. This is done by ensuring that the operating pressure of the pneumatic control line of the shutter 6 is close to the fuel gas supply pressure, for example by means of two check valves (not shown): a leak device connected in series with the pneumatic control line 3, preferably in correspondence with said discharge valve DV; and the other at the outlet of the air inlet 26.

By adjusting the check valve opening to the fuel gas supply pressure and setting the preload of the above-described static spring 71 of each actuator 7 appropriately:

for a particular burner 1 that ignites (for example, by pressing the power 20.1 and select 20.2 buttons simultaneously), each subsequent pressing of the select button 20.2 will correspond to a discrete increase in pressure in the control line 3, up to the minimum level required to open the first closure shutter in the sequence of shutter devices 6 of each injector inj.n

For a particular burner 1, which is ignited by pressing the selection button 20.2 all the time (which is considered as a displacement pump), it is possible to obtain a pressure reduction for the various shutter means 6 of the injector inj.n, which are successively closed one after the other until reaching a minimum pressure of the pneumatic control line (practically equal to the minimum pressure of the gas supply). Thus, for the particular burner 1 that is closed, the pressure gradient between the pneumatic chamber 60 and the plenum 81 is zero and there is a risk of gas leakage to the external domestic environment.

The overpressure generated in the pneumatic chamber 60 in order to keep the particular burner 1 ignited will cause air leakage towards the air chamber 81 in case of damage to the seal 62, but is not particularly problematic as it will automatically reduce the pressure of the pneumatic control line 3, causing a continuous and simultaneous closing of the shutter 6 of the injector inj.

In the case of a minimum pressure of the pneumatic control line equal to atmospheric pressure, there will be a fuel gas leak inside said pneumatic line 3 in the event of damage to the seal 62 of the injector inj.n; this does not constitute any risk, since the pneumatic line 3 has a very low internal volume, which is watertight and leaks a very small amount of fuel gas.

When the burner 1 is closed, SV is in the "closed" position as shown in the figures, and eventually the gas leaking in the control line 3 flows away through the discharge valve DV, or remains confined on the same line if said valve DV is equipped with the above-mentioned check valve regulated to the gas pressure.

However, as shown, the shutter device 6 of the plurality of injectors inj.n is in the "normally closed" position, thereby preventing the fuel gas from flowing toward the respective injectors inj.n; the ignition and power modulation system of a particular burner 1 is therefore intrinsically safe.

The adjustment diagram of the ignition (or switching off) and the fire of the particular burner 1 according to this variant is shown in fig. 6, and the following steps are provided by way of non-limiting example: once a particular burner 1 is activated to its minimum firing power (i.e., the only primary zone FL)₁Is enabled; see (i) and (ii) in fig. 6), further successive pressings of the latter will correspond to immediately adjacent flame zones FL₂Ignition of (c) (see (iii) in fig. 6); conversely, a possible subsequent and prolonged pressing on the same selection button 20.2 will result in the last activated flame zone FL_n(in this case, the second flame region FL)₂) And a consequent reduction in its power level (see (iv) in figure 6).

If said special burner 1 is already at minimum power (zone FL only)₁Ignition), then extending the full press of the selection button 20.2 will cause the selection button to be depressed fully 20.2Causing it to eventually close.

Alternatively, the pneumatic control system for the ignition of the particular burner 1 of the invention may also be of the "vacuum type"; thus, fig. 9a-9d show the opposite buttons 20. n.

According to this variant, at least one button 20.n of the button panel 2 is a tubular body comprising an outer gasket 21 fixed to a support (for example the aesthetic face of the gas cooktop P), which in turn comprises a connecting channel 22 connected to the pneumatic control line 3 and an opposite check valve VNR 1.

The movable key 23, when pressed, is able to move vertically within the fixed gasket 21 in order to open the "normally closed" valve VNR1, for reasons that will be clarified later.

Once depression of the key 23 is over, the internal pre-compressed spring 28 can return the valve VNR1 to the "normally closed" position.

Between the bottom 230 of said key 23 and the bottom of said outer gasket 21 there is provided a sealed chamber 24 for the pneumatic control line 3, said chamber 24 changing its volume according to the above-mentioned vertical movement of the key 23 of the push button 20. n.

By pressing the key 23 partially inside said collection chamber 24 (partial pressing is understood to be insufficient to press the button fully), a vacuum is thus created which opens the check valve VNR1 and draws air from the pneumatic line 3 (which is pressed); subsequent to releasing the same key 23, the check valve VNR1 will immediately be closed by the pre-compressed recovery spring 27, which recovery spring 27 is able to re-compress the collection chamber 24 until the discharge valve VRN2 at its bottom 230 is opened.

This sequence may be repeated to further increase the vacuum level of the control line 3.

Pushing the key 23 all the way down, obtaining the alignment of the transverse grooves 25 of the outer gasket 21 with the plurality of air inlets 26 of said sealed chamber 24, so as to allow the penetration of the ambient air into the pneumatic control line 3 for its recompression; this corresponds to the closing of the shutter means 6 of the injector enj.n served by said control line 3.

It should be noted that the at least one push button 20.n for the "compression" pneumatic system previously described and illustrated in fig. 8a-8d may be identical to this "vacuum" configuration, except that the operating direction of the two valves VNR1 and VNR2 is reversed.

The specific application of said vacuum pneumatic control is illustrated in fig. 4f, according to which the activation of a particular burner 1 is governed by a single push-button 20.n, which can act on a microswitch MT of an electromechanical control group SWT, suitably connected and/or wired to the igniter IGN, the discharge DV and the safety SV valve, which can intercept the fuel gas feed line 4.

According to this version, starting from a particular burner 1 in closed configuration, first of all a partial push of the button 20.n is applied for a predetermined period of time (preferably of the order of a few seconds), the electromechanical group SWT being used to close the discharge valve DV by a specific signal along a suitable dedicated connection wiring, while opening the safety valve SV and enabling the igniter IGN to ignite the primary flame zone FL₁。

When the push-button 20.n is released, the same electromechanical group SWT cuts off the signal to the igniter IGN and to the discharge DV and safety valve SV.

If ignition of the particular burner 1 has taken place, the above-mentioned flame detector FD should keep the discharge valve DV in the "closed" configuration and the safety valve SV in the "open" position; otherwise, as shown, the safety valve SV is immediately closed, interrupting the gas flow to the burner 1, avoiding gas leakage when the discharge valve DV is opened to restore the pressure along the pneumatic control line 3 of the injector inj.

It is not necessary to describe in detail the fire power adjustment of the special burner 1 (continuous flame zone FL)_nContinuous ignition/off) which is completely similar to that seen and described so far.

On the contrary, it is necessary to point out that the triggering of the igniter IGN preferably has a preset delay time with respect to the pressing on the push button, so as to avoid unnecessary ignition also during the fire power modulation of the special burner 1 of the present invention.

The same optimization and simplification of the control lines of the injectors inj.n of the particular burner 1 of the invention can also be obtained, as expected, by providing shutter means 6 of electrical and/or electronic management.

According to this variant, schematically illustrated in fig. 4e, the actuator 7 of each shutter 6 is preferably:

as mentioned, known actuators of the electrodynamic type comprise excitation coils of opposite electromagnets, electrically connected in parallel with each other and dimensioned to receive a predetermined range of voltage values

Connected in series with each other and fed by the same electric wire 3 (for example of the single-wire type).

An electrical control circuit CMD connected to the push-button panel 2 converts each press on the push-button 20.1 and/or 20.2 into a discretely increasing or decreasing voltage signal, so as to obtain a fire power modulation of the particular burner 1 (see steps (i), (ii), (iii), (iv) of fig. 7), similar to what can be achieved with the pneumatic system described above.

In contrast, the simultaneous pressing of the two push-buttons 20.1, 20.2 and the closing of the burner 1 determine the ignition (more precisely, the activation of the primary flame zone FL)₁As shown in fig. 7 (i).

More precisely, the opening or closing of each injector inj.n may be obtained by providing different alternative solutions.

For example, in the case where the electric actuators 7 of each injector inj.n are different, it will be sufficient to make different dimensioning of their coil windings, in order to obtain a smooth progression of the relative shutter 6 only at the appropriate level of the voltage signal from the electric control line CMD.

The same results are clearly obtained by providing the same electric actuator for all the shutters 6 of the injectors inj.n, but the static springs of different dimensions obtain a smooth progression with respect to the shutter device 6 only at the appropriate level of the electric signal (e.g. voltage or current) coming from said electric control line CMD; more precisely, when said level of the voltage signal generated by pressing the push button increases, all the electric actuators 7 will in sequence exceed the resistance of the relative static spring by activating the shutter 6.

Vice versa, in order to reduce the power of the particular burner 1, at each step of lowering of the control signal managed by the control card CMD, each static spring will exceed the electromagnetic force of the corresponding electric actuator 7, closing the shutter device 6 on which it rests.

It is obvious that a combination of the two solutions described above is also possible.

According to another alternative, the electric actuator 7 and the static spring can be provided identical to each other. In this case, the continuous opening or closing of the shutter is obtained (more generally "smooth running") by simply adjusting the preload of its static spring at different values.

Finally, the use of more advanced electric actuators 7, such as linear stepper motors or the like; in this case, the control lines 3 will become the actual data bus, where the master is the push-button panel 2 and the relative electrical control lines CMD (which become the actual electronic cards with computing capabilities), and the slaves are the actuators 7 of the shutters 6 of the injectors inj.

This achieves further advantages in connection with diagnostic procedures and ultimately a higher level of safety and reliability overall.

Fig. 4g finally shows a last variant of the control and regulation system of the particular burner 1.

Said variant provides an electric control circuit CMD of a particular burner 1, connected on one side to a push-button panel 2, which push-button panel 2 comprises a single push-button 20 and therefore able to function both as power button and selection button, and on the other side to a single electric control line 3 of the injectors inj.

In this case, a short press of said button 20 should correspond to a power reduction (or if there is only the main flame zone FL)₁For activation, the burner 1 is switched off), whereas a long press corresponds to an increase in the power. The electrical control circuit CMD is able to recognize whether a long press on the push-button has been associated with the first ignition (primary flame zone Fl) according to the presence or absence of the reception of the flame signal sent by the flame detector FD connected to it₁Ignition of) corresponds.

In fact, in the event of long-time depression of burner 1 in the closed position, electrical control circuit CMD opens safety valve SV feeding burner 1 with fuel gas, so as to activate igniter IGN connected thereto, and sends a signal for opening injector inj.l, which is installed in main flame zone FL through said electrical control line 3₁Upstream of (c).

For an already covered pneumatic tank, when the button 20 is released, the signal generated from the flame detector FD will keep the safety valve SV open if the ignition is successful; otherwise, the electrical control circuit CMD will close the safety valve SV and the main flame zone FL₁I.l.

In this connection, it is possible to describe the management logic of a gas range integrating a plurality of said specific burners 1 and relative ignition and the modulation system described above.

In the following embodiments, without any limiting intent, reference should always be made to the electrical/electronic variants of the control and regulation system for the particular burner 1, with the understanding that all this should be extended to the pneumatic version.

By way of example only, fig. 10 shows a gas range P comprising four special burners 1 just described, each comprising four injectors inj.n, as shown, feeding the same number of flame zones FL_n. The gas range shown has three levels of safety; a first safety level (called "reference level") is ensured by a known, universal safety solenoid valve SSV ("normally closed") which is able to cut off the main line L for supplying fuel gas (indicated by the thick grey line in fig. 10, thus branching off a plurality of gas supply lines 4 downstream of the same valve SSV for each single burner 1, indicated by the "dashed line" in the figure) when the special burner 1 is not ignited. The second safety level is represented by a safety valve SV (shown, also "normally closed"), which is provided for each burner 1 and is adapted to interrupt the fuel supply line of the single burner 1 in the absence of an acknowledgement signal from its flame detector FD (dashed line in fig. 10); a third safety level is guaranteed by the shutter 6 of each injector inj.n connected in series by a single control line 3 (see dashed line in fig. 10), the electric control line CMD sending a closing signal when the flame detector FD detects an accidental closing of the flame or when the burner 1 is closed.

This redundancy can be advantageously used to make a simplified version of the gas burner P always comprise at least two safety levels. In fact, even in the absence of the ordinary safety valve SSV, the safety against fuel gas leakage in the absence of flames is guaranteed at least by the safety valve SV of each specific burner 1 and by each shutter of the plurality of injectors inj.n fed to it.

Another simplified variant, shown in fig. 11, provides for the absence of the safety valve SV of a single special burner 1. Even in this case, the basic safety level is guaranteed by the common safety valve SSV, and the second safety level is guaranteed by the shutter 6 of the injector inj.n of each specific burner 1. In this case, all the flame detectors FD of the particular burners 1 of the gas range P are directly connected to the safety valve SSV by means of the electric cable 55, so as to be able to return to the "normally closed" position in the event that the flame of one of said burners 1 of the gas range P has been accidentally turned off.

The distinction between accidental or voluntary shut-down of each particular burner 1 is ensured by the electrical control circuit CMD, according to the reception or non-reception of a flame signal, which, as shown, is determined by the respective flame detector to which it is connected.

Fig. 12 shows a further variant according to which the safety function consists of closing the injectors inj.n in case of accidental flame closure, instead of being assigned to the electrical control line CMD, due to the special safety relays K (for example, one of which is a timed dual input), which is the normally open one for each special burner 1. In this version, the safety function of the fuel injector inj.n disabled in case of accidental flame shut-off (absence of signal from flame detector FD) is due to a normally open special safety relay k (i) (e.g. solid state type). Each relay is connected in series with its injector inj.n control line 3 so as to switch it off in the absence of a flame; while the flame signal from said detector FD can keep them in the closed position. To allow for first firing, the CMD set will be oriented towards L_KThe control line 3 of the injector of the burner of the stage supplies a first signal (e.g. voltage), L_KThe stage is closely below the minimum activation level of injector INJ.1 (referred to as L)₁). Signal level L_KIt must be possible to close k (i), but not enough to open the first injector in series. The apparatus K (i) may be equipped withAt the timing of the first reception of the signal L_KAfter a few seconds, k (i) can only be kept closed by the signal of the flame detector FD and returned to the open position without this signal, forcing the user to repeat the step of first ignition. In this way, the control signal (L) at the power level of the burner is avoided₁<L₂<L₃<L₄) And an ignition signal L_K(wherein L_K<L₁) The overlap between them.

Moreover, nothing prevents providing a further constructive variant (see fig. 13) comprising a safety function group SFT, which is assigned the task of constantly receiving the flame signal from the flame detector FD of each particular burner 1 of the gas range P and comparing it with the information of the ignition state of said burner 1 from the electronic control board CMD.

According to this variant, in the event of an accidental closure of the special burner 1, the safety function group SFT will command the closing of the generic safety valve SSV.

By connecting it to the data line 56 of the electrical control line CMD, the safety function group SFT can also be activated in the event of the first ignition of the burner 1 (i.e. repeatedly its main flame zone FL)₁) The universal relief valve SSV is forced to an "open" configuration. Said data line 56 finally allows the electrical control circuit CMD to receive information about the presence of a flame and to close all injectors inj.n through the shutter relative control line 3 in case of accidental closure or misfiring of the burner 1.

Fig. 14 finally shows a last constructive variant of the gas burner P, which comprises:

a single gas supply line 4, downstream of the general safety valve SSV, which connects all the injectors INJ.n of all the specific burners 1, by feeding them in succession (starting, by way of non-limiting example, from the injector INJ.1 of the specific burner 1, denoted BRN1, to the injector INJ.4 of the specific burner 4 of the gas range P, denoted BRN 4)

A single control line 3, which continues to connect sequentially from the electrical control line CMD all the special burners 1 of the same gas range P (instead of having as many dedicated control lines as the burners 1 of the gas range P, as shown in the structural embodiment of fig. 10-13), said single control line 3 being used for all the injectors inj.n of each burner, as shown. The control line 3 is a bus connecting all the electric actuators 7 of bistable (etc.) interlocked and addressed by the CMD device.

It is evident that many modifications and further variants may be provided in the practical implementation of the invention, all falling within the same inventive concept. All the various components and details described above may also be replaced by technically equivalent elements.

For example, in a very wide flame zone FL_nBy means of an injector inj.n, it is also possible to have a group of injectors inj.n, all of which serve the same flame zone FL_nIt is understood that the set of injectors inj.n is directed the same as a single injector inj.n.

By means of the control and management system of the particular burner 1 of the present invention, it is possible to achieve the stated objectives, in particular the possibility of discrete and intuitive adjustment of its fire (as shown in fig. 3b), even for users with little experience, with ease and direct comprehension. The single fuel gas supply line 4 for all injectors inj.n, for the particular burner 1 and for the single electric/electromechanical or pneumatic control line 3 provided for it, also allows considerable structural simplification of the gas cookers implementing said particular burner 1, even if this is undoubtedly advantageous from an economic point of view. The use of the injector inj.n integrated with the relative shutter device 6, which is normally closed in the event of burner closure or accidental closure of the flame, ultimately ensures an additional level of safety against fuel gas leakage and escape.

Claims

1. Atmospheric burner (1) for a gas range (P), comprising:

-a plurality of adjacent flame generating zones (FL)_n)，

-a plurality of injectors (ej.n) adapted to mix combustion air and fuel gas, said injectors (ej.n) being said plurality of flame generation zones (FL)_n) The service(s) is (are) provided,

-a plurality of injectors (INJ.n) for supplying said fuel gas in said injectors (EJ.n), each injector (INJ.n) being placed at the inlet of a respective injector (EJ.n),

in the plurality of adjacent flame generation zones (FL)_n) In (1), identifying:

-primary flame zone (FL)₁) Equipped with ignition means (IGN) and an associated Flame Detector (FD), and fed by a respective injector (INJ.n) of said plurality of injectors (INJ.n), first to said primary flame zone (FL)₁)；

-another flame generation zone or zones (FL)_n) Each fed by a respective one (INJ.n) of said plurality of injectors (INJ.n), said further one or more flame generating zones (FL)_n) Can be supplied and activated one after the other in sequence;

each pair of flame generating zones (FL)_n) Including a main one (FL)₁) Which are fed in succession, adjacent to each other, in such a way as to be in the main flame region (FL)₁) After activation, there is no continuous flame-producing zone (FL) that has been ignited_n) None of the flame generating zones can be powered and activated;

it is characterized in that

Respective and dedicated flame generation zones (FL) each adapted to serve said atmospheric burner (1)_n) The fuel injector (inj.n):

-connected and fed in succession by a single supply line (4) of said fuel gas;

-activated by a single control line (3) adapted to serve all injectors (INJ.n) of said plurality of injectors (INJ.n) and connected to a push-button panel (2; 20.n), said push-button panel (2) comprising at least one flame generation zone (FL) capable of being associated with said atmospheric burner (1)_n) And/or ignition mode (20. n);

and lie in

The single control line (3; 3.1.. 3.n) is connected to an electrical control line (CMD):

-adapted to receive signals from said button panel (2) and said Flame Detector (FD) at least through respective cables (53, 51);

-sending control signals to said ignition device (IGN) and to a Safety Valve (SV) located through respective wiring (52, 50) along said single supply line (4) upstream of said plurality of injectors (inj.n).

2. Atmospheric burner (1) according to claim 1,

characterized in that it comprises a double safety system to prevent leakage of fuel gas in the event of incomplete ignition of its accidental failure, comprising at least:

-said Safety Valve (SV) is "normally closed" and is controllable by said push-button panel (2) to switch to an "open configuration" suitable for passing said fuel gas towards said plurality of injectors (inj.n);

-a "normally closed" shutter device (6) of each of said plurality of injectors (inj.n) is able to allow or prevent, on command, the discharge of said fuel gas towards the respective injector (ej.n) for activating the opposite flame generation zone (FL)_n) But at the same time ensures its passage towards the next injector (inj.n), so that each of the injectors (inj.n) also acts as a shut-off valve.

3. Atmospheric burner (1) according to claim 2,

it is characterized in that

The Safety Valve (SV) and the shutter means (6) of each of the plurality of injectors (INJ.n) are interlocked with the Flame Detector (FD), the Safety Valve (SV) and the shutter means (6) being able to return to a "normally closed" configuration in the absence of a flame signal detected by the Flame Detector (FD).

4. Atmospheric burner (1) according to claim 2,

it is characterized in that

The shutter means (6) of each injector (inj.n) of said plurality of injectors (inj.n) is controlled by a respective actuator (7) when switching from said "normally closed" to its "open" configuration, the static spring (71) of said actuator (7) returning said shutter means (6) to its "normally closed" position when the pulse generated by said push-button panel (2) ceases.

5. Atmospheric burner (1) according to claim 4,

it is characterized in that

The actuator (7) is an electromechanical actuator, the electromechanical actuator (7) comprising a coil wound on the shutter device (6) of each injector (INJ.n) of the plurality of injectors (INJ.n) and being capable of converting an electrical signal transmitted to it by the button panel (2) in an electromagnetic field by means of the at least one control line (3; 3.1.. 3.n), which causes a linear movement thereof.

6. Atmospheric burner (1) according to claim 5,

it is characterized in that

-the electromechanical actuators (7) of each shutter device (6) of the fuel injector (inj. n) are different from each other, so that the winding size of the coil of each electromechanical actuator (7) is different to obtain a smooth travel of the associated shutter device (6) only at a suitable level of the voltage signal from the electrical control line (CMD).

7. Atmospheric burner (1) according to claim 5,

it is characterized in that

-the electromechanical actuators (7) of each shutter device (6) of the injector (inj. n) are identical to each other, the static spring (71) of each actuator (7) being differently sized to obtain a smooth travel of the associated shutter device (6) only at a suitable level of the voltage signal from the electrical control line (CMD).

8. Atmospheric burner (1) according to claim 5,

it is characterized in that

-said electromechanical actuator (7) and said static spring (71) of each shutter device (6) of said fuel injector (inj. n) are identical to each other, a continuous smooth travel of said shutter device (6) being obtained by adjusting the preload of said static spring at different values.

9. Atmospheric burner (1) according to claim 4,

it is characterized in that

The actuator (7) of each shutter device (6) of the injector (inj. n) may be constituted by a stepping motor or the like, the single control line (3) is a data bus, wherein the master is the button panel (2) and associated electrical control lines (CMD), and the slave is the actuator (7).

10. Atmospheric burner (1) according to any of claims 2 to 9,

it is characterized in that

The shutter device (6) and the corresponding injector (INJ.n) form a single valve body.

11. Atmospheric burner (1) according to any of claims 2 to 9,

it is characterized in that

The shutter device (6) and the corresponding fuel injector (inj.n) are logically and physically separate elements.

12. Atmospheric burner (1) according to any of claims 1 to 9,

it is characterized in that

The flame generation zone (FL)_n) May consist of a plurality of concentric flame crowns.

13. Atmospheric burner (1) according to any of claims 1 to 9,

it is characterized in that

The flame generation zone (FL)_n) With each to all subsequent adjacent shapes.

14. Atmospheric burner (1) according to any of claims 1 to 9,

it is characterized in that

The ejector (ej.n) is of the "vertical venturi" STD or "horizontal venturi" LIN type.

15. Atmospheric burner (1) according to any of claims 1 to 9,

it is characterized in that

The button panel (2) may be electromechanical or electronic or pneumatic.

16. Atmospheric burner (1) according to claim 15,

it is characterized in that

The push-button panel (2) is an electronic push-button panel comprising a pair of push-buttons (20; 20.1, 20.2), the push-button panel (2) controlling each injector (INJ.n) of the atmospheric burner (1) through a single electrical control line (3), the single electrical control line (3) being connected to an electrical control line (CMD) capable of converting any pressure on the pair of push-buttons (20; 20.1, 20.2) into a voltage signal that increases or decreases discretely and causes continuous activation of the injectors (INJ.n) of the plurality of injectors (INJ.n).

17. Atmospheric burner (1) according to claim 15,

it is characterized in that

The push-button panel (2) comprising a single push-button (20) capable of acting both as ignition and selection push-button, said single push-button (20) being connected to the electrical control line (CMD), which in turn is connected to the fuel injector (INJ.n) through said single electrical control line (3),

a short press of the single button (20) corresponds to a decrease in the fire power of the atmospheric burner (1), while a long press corresponds to an increase in the fire power,

the electrical control line (CMD) is of a type capable of identifying whether the long press should correspond to the first ignition of the atmospheric burner (1) depending on whether a flame signal sent from the Flame Detector (FD) is received or not.

18. Atmospheric burner (1) according to any of claims 1 to 9,

characterized in that it comprises a single Flame Detector (FD) and a single Igniter (IGN).

19. Gas burner (P) comprising two or more burners (1) according to any one of claims 1 to 18,

characterized in that it comprises at least two safety levels against fuel gas leakage.

20. Gas kitchen ranges (P) according to claim 19

It is characterized in that

The at least two security levels include:

-a Safety Valve (SV) provided for each atmospheric burner (1) of said gas range (P) and adapted to interrupt the fuel gas supply line (4) of a single atmospheric burner (1);

-shutter means (6) for closing each fuel injector (inj.n) of each atmospheric burner (1).

21. Gas stove (P) according to claim 19,

it is characterized in that

The at least two security levels include:

-a general safety valve (SSV) able to interrupt the general fuel gas supply line (L) of the atmospheric burner (1);

22. Gas kitchen ranges (P) according to claim 21

It is characterized in that

The Flame Detector (FD) of each atmospheric burner (1) of the gas range (P) is directly connected to the universal safety valve (SSV) which is able to return to a "normally closed" position in the event of the flame of at least one of the atmospheric burners (1) of the gas range (P) extinguishing.

23. Gas stove (P) according to claim 19,

it is characterized in that

The at least two safety levels against leakage of combustion gas include three safety levels including:

-a safety valve (SSV) for general use able to interrupt the fuel gas supply line (L) of the atmospheric burner (1);

24. Gas stove (P) according to any of the claims 19 to 23,

it is characterized in that

In the event of an accidental flame extinction, the closing of the injectors (inj.n) is assigned to the electrical control Circuit (CMD).

25. Gas kitchen range (P) according to any of claims 19 to 23

It is characterized in that

In case of accidental extinguishing of the flame, the closing of the injectors (inj.n) is assigned to a "normally open" timing relay (K), one for each atmospheric burner (1) of the gas range (P).

26. Gas kitchen range (P) according to any of claims 19 to 23

Which is characterized in that it comprises

-a single gas supply line (4) through which it is possible to connect all the injectors (inj.n) of all the two or more atmospheric burners (1) of the gas range (P) by feeding them in succession;

-a single control line (3) able to connect in succession all the two or more atmospheric burners (1) of the gas range (P), said single control line (3) serving all the injectors (inj.n) of each of said two or more atmospheric burners (1).