DE2917584A1 - AUTOMATIC GAS BURNER - Google Patents

Description

MAIN GAS APPLIANCES LIMITED, London, England

Automatic gas burner

The present invention relates particularly, although not exclusively, to automatic gas burners on automatic gas burners for household stoves. The designation used in the description below "Gas" refers to natural gas, town gas and other gaseous substances that can be burned in the air, to generate carbon dioxide and water vapor.

There are automatic household cookers are known which have time setting devices that allow the user make it possible to preset a start time and a duration for a cooking process. A pilot burner inside The stove is supplied with gas and ignited electrically at the preset start time and this burner ignites again a main burner within the range. So far one has the combustion of the gas which is fed to the main burner .is monitored by a mercury vapor flame monitoring device, as described for example is on pages 160 to 161 of "The Principles and Practice of Gas Appliance Controls" by V.C. Miles and L.H. Pinkess, published by Walter in 1970 King Limited, Holborn Hall, 100 Gray's Inn Road, London, W.C. 1. Such mercury vapor flame monitors however, represent a potential health hazard in cooking stoves, and therefore will Not considered suitable in some European countries. The consequence is that an alternative arrangement is required.

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According to one aspect of the present invention, the automatic gas burner includes a main gas burner, a Gas line for supplying gas to the main gas burner, with a safety valve and a time-controlled valve contained in succession in this line, a first thermoelectric device, a device for heating or heating the first thermoelectric device, a second thermoelectric device so arranged is that it is heated by the gas which the main burner burns in operation, a device for Forwarding thermoelectrically generated electricity from either the first or the second thermoelectric device to the safety valve, the safety valve being such that it is closed if it is not is held open manually or after a manual opening is kept in its open state by a sufficient supply of thermoelectrically generated electricity, further comprising the timed valve having means for actuating the ignition of the main burner during operation of the timed valve to enable gas to be supplied to the main burner and further the time-controlled valve is provided with devices, which prevent the first thermoelectric device from supplying thermoelectric current to the safety valve, while the timed valve allows gas to be supplied to the main burner, further including the first thermoelectric device is able to generate a sufficient current depending on its heating by the device for heating the first thermoelectric device, and the second thermoelectric The device is arranged and designed so that it generates sufficient electricity when it is heated by the gas, which the main burner burns during operation and that the safety valve through the second thermoelectric device is controlled during the combustion of gas in the main gas burner.

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The device for heating the first thermoelectric Device can be a secondary or auxiliary burner, and the first thermoelectric device -is arranged so that it is heated by the gas that burns on the secondary or auxiliary burner. The gas can lead to this Auxiliary burner can be supplied through a branch line from the gas line. Preferably the gas flow is to or controlled by this branch line by the safety valve. Furthermore, in one embodiment, which has this auxiliary or auxiliary burner, the time-controlled valve consists of a two-way valve, and it enables that the gas flows into the branch line only when a gas flow to the main burner is prevented. The timed Valve in this embodiment thereby forms the device which prevents the first thermoelectric device supplies thermoelectric power to the safety valve while the timed one Valve allows gas to be supplied to the main burner so that the first and second thermoelectric devices both can be coupled to the safety valve, regardless of whether gas is fed to the main burner or not.

In other exemplary embodiments with a secondary or auxiliary burner, the gas flow remains through the branch line unaffected by the state of the timed valve. The gas is then continuously fed to the secondary or auxiliary burner burned during the entire operation of the device and the device that prevents the first thermoelectric device supplies thermoelectric current to the safety valve while the timed valve allowing gas flow to the main burner is provided in the form of an electrical switching device so arranged and is formed and switched by the time-controlled valve that prevents the thermoelectric Voltage generated by the first thermoelectric device passes to the safety valve, while, and

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only while the timed valve allows gas to be supplied to the main burner.

Preferably, an embodiment with the secondary or auxiliary burner contains electrical devices for Ignition of the main and secondary burners and a thermostatic valve that is installed or contained in the gas line, allows ignition of the secondary burner when the thermostatic valve opens while the timed valve prevents gas from being supplied to the main burner.

In a household automatic range according to the present invention, the first are thermoelectric devices and its heating device is located outside the oven space in which food is cooked, since then namely, the heating device for the first thermoelectric device does not prematurely heat the "food in the oven space can cause it to be unusable could lead.

Preferably, the electrical device is for Ignition of the main burner and to ignite the secondary burner, if one is present, from a flame-sensing one Ignition electrode that, when connected to voltage, emits electrical sparks when surrounded by a mixture of air and gas and the spark emission ceases when it comes into contact with a flame.

According to another aspect of the present invention an automatic gas burner is provided comprising a main gas burner, a gas line for supplying gas to the main gas burner, a safety valve and a time-controlled valve, one behind the other in this line are built in, a first power source for supplying electric power with a predetermined strength, a second power source with a thermoelectric device that

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arranges and is designed so that it can be heated by Gas that is burned at the main burner in operation, a device or circuit for supplying electricity either from the first or the second source to the safety valve, wherein the safety valve is designed such that it is closed unless it is held open manually or in its open state in a manual opening is held, either by the flow of predetermined magnitude from the first source or by a sufficient one Supplied with power from the second source, further comprising the timed valve having a device for igniting the main burner is provided upon actuation of the timed valve to allow gas to flow to the main burner is supplied, and there are further provided means to prevent the first source from the safety valve Supplies power while the timed valve allows gas to be supplied to the main burner, and Finally, the thermoelectric device is arranged and designed so that it supplies a sufficient current, when it is heated by the gas that is burned on the main burner during operation and the safety valve controlled by the second source while the gas is being burned at the main gas burner.

The invention will then be explained with reference to the drawings of exemplary embodiments. Show it:

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Fig. 1 is a schematic sectional view of a Safety valve that can be used in an embodiment of the present invention;

F i g. Figure 2 is a schematic view of an automatic gas burner according to the invention;

F i g. 3 shows a further schematic view of the exemplary embodiment of Fig. 2;

F i g. 4 is a schematic view of a further embodiment of the invention;

F i g. Fig. 5 is another schematic view of the embodiment according to Fig. 4;

F i g. 6 is a schematic view of a further embodiment of the invention;

F i g. 7 shows another schematic view of the exemplary embodiment of FIGS. 6 and

F i g. 8 is a schematic sectional view of a safety valve for use in the embodiment of FIGS. 6 and 7.

1 schematically shows a safety valve 10, which is provided by first and second thermoelectric devices 11 and 12 is controlled as well as a gas burner 13 and a gas line 14 for supplying gas from the valve 10 to the Burner 13.

The safety valve 10 has a body 15 with a Inlet 16 and an outlet 17. Inside the body 15 there is provided a valve seat 18 against which a valve body is biased with a shaft 20 by a helical spring 21. At the end of the stem that is from the valve body is remote, an armature 22 is arranged, which can be held by an electromagnet 23 if a sufficient strong current flows through the winding of the electromagnet. The thermoelectric]! Devices 11 and 12 are parallel

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connected to one another to the winding of the electromagnet 23.

Each of the thermoelectric devices 11 and 12 is able to generate such a strong current that that the electromagnet 23 holds the armature 22, provided that the armature 22 is initially or initially printed in contact with the core of the electromagnet. So that the armature 22 is manually in contact or in contact can press with the electromagnet 23 is a spring-biased button 24 with a shaft 25, which is aligned with the shaft 20, is provided in the upper part of the valve body 15. The shaft 25 extends through a gas seal (not shown) in the top wall 26 of the valve body 15.

With the aid of the arrangement of FIG. 1, gas can be supplied to the burner, provided one of the thermoelectric ones Devices 11 and 12 are heated sufficiently so that they can generate a sufficiently strong current to generate the Armature 22 to hold against the electromagnet 23 as soon as the valve 10 is opened by manually depressing the button 24 has been. An embodiment of the present invention can be obtained in that in the in The arrangement shown in FIG. 1 incorporates a time-controlled valve which controls the gas flow in the gas line 14 can. The time-controlled valve can either be in the pipeline 14 between the safety valve 10 and the Burner 13 or installed at the inlet 16 of the valve 10, and further devices are provided, which are controlled by the time-controlled valve for igniting the gas on the burner 13, whenever the time-controlled one Valve is open and for heating the thermoelectric device 11, and only when the time-controlled valve is switched off.

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Figs. 2 and 3 show an embodiment of the Invention in which a time-controlled two-way valve 30 controls the gas flow from the safety valve 10 to the burner 13 and to a secondary or auxiliary burner 31 controls the Heating the thermoelectric devices 11 is used and is arranged accordingly. The thermoelectric devices 11 and 12 are thermocouples in this exemplary embodiment j and can be connected in series with one another, as shown in FIGS. 2 and 3 at (a), or in parallel to each other, as shown in FIGS. 2 and 3 at (b).

The timed valve 30 is designed so that when it allows the gas supply to the auxiliary burner 31, it at the same time prevents gas from flowing to the main burner 13 and vice versa. The valve 30 is thus a mechanical one Means which prevents a thermoelectric voltage is generated by the device 11, which is on the Safety valve 10 could be applied, and only if the valve 30 allows gas to the main burner 13 flows. The valve 30 also controls a single pole Changeover switch 32 in an ignition circuit for the two Burners 13 and 31. A thermostatic valve 33 controls an on / off switch 34, which is in series with switch 32 is switched in the ignition circuit. The thermostatic valve 33 controls the gas flow to the safety valve 10 and stops the switch 34 closed as long as gas to the valve flows, and it also holds the switch 34 open when gas is prevented from flowing to valve 10.

In Fig. 2 the device is in a standby state shown, in which the thermostatic valve 33 is open, the safety valve 10 is open and the time-controlled Valve 30 prevents gas from flowing to burner 13, but at the same time allows gas to flow to the by-burner 31 flows. The switch 34 is closed and the

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movable contact 35 is located in a position in which it an ignition device 36 over the closed Switch 34 connects to an electrical voltage source (not shown). The ignition device 36 has one arranged in this way Metal electrode 37 so that it can sense a flame on the secondary burner 31. If there is no flame sparks are given off by the electrode 37, and these serve to create any air-gas mixture which the electrode 37 surrounds to ignite. If, however, a flame is present at the secondary burner 31, the flame causes a Conductive path formed from the electrode 37 to the burner 31, which is at ground potential. The ignition device 36 is responsive to the presence of a flame sensed by electrode 37 and causes that the electrode 37 stops the discharge of sparks. A neon indicator lamp 38 is coupled to the igniter 36 and flickers during the discharge of sparks by the electrode 37 and radiates constantly or evenly, when a flame is sensed by electrode 37. The neon lamp 38 thus forms a visual display of the Operation of the ignition device 36 and also shows that Presence of a flame on the secondary burner 31. If for any reason this flame goes out during the Ignition circuit remains in the state shown in Fig. 2, the spark emission at the electrode 37 begins again and is continued until the flame is fully established again, meanwhile the neon lamp through A flicker indicates that the flame has gone out. The main burner 13 remains switched off as a further ignition device 39 with a metal electrode 40 for igniting the main burner 13 during the standby state of the Device is not energized. The position of the movable contact 35 is in this state so that this of the Ignition device 39, as shown in Fig. 2, is separated.

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Fig. 3 shows the device in a switched on State in which the timed valve 30 prevents gas from reaching the secondary burner 31, but while it allows that gas reaches the main burner 13. The switch 34 is still closed in this state, but the movable contact 35 of the switch 32 is in its other position, in which it isolates the ignition device 36 of the secondary burner 31 and the ignition device 39 of the main burner 13 with the electrical voltage source (not shown) interconnects. Consequently, the sub-burner 31 does not heat the thermoelectric device 11, and the main burner 13 is ignited by the igniter 39 and its electrode 40 in the same manner as this previously in connection with the burner 31 in FIG. 2 is described. The thermoelectric device 12 is heated by the burner 13 and generates a sufficient one strong current for the safety valve so that it is in held in its open position.

If the flame on the main burner 13 goes out while if the device is in its switched-on state, the ignition device 39 tries the burner 13 to re-ignite.

At the end of the actuated state caused by the setting of the time-controlled valve 30 is set, the device returns to its standby state, which is maintained indefinitely until the user closes the thermostatic valve 33.

In any state of the device, if the burner 13 or 31, which should be running, fails and cools down does not reignite, the corresponding thermoelectric device 12 or 11 until the thermoelectrically generated Current from these to the safety valve 10 is no longer sufficient to keep this valve in the open state.

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The valve then closes and prevents any further escape of gas through the burners 13 or 31.

In use, the device is initially in a switched-off state (not shown) in which the thermostatic valve prevents gas from reaching the safety valve 10, and furthermore the thermostatic valve holds switch 34 open, causing both igniters 36 and 39 are kept separate from the electrical voltage source (not shown). The timed valve is set manually so that the gas reaches the main burner 13 so that this is at a predetermined Time is started and works continuously over a predetermined length of time. The thermostatic valve 33 is then set by hand to the desired temperature to which the room to be heated is reached by the main burner 13 should be brought. This enables gas to flow to safety valve 10 and switch 34 to close. The movable contact 35 of the switch 32 is in the position shown in Fig. 2 and the electrode 37 begins therefore emit sparks as soon as the thermostatic valve 33 opens. It is now a channel for gas flow through the time-controlled valve 30 to the secondary burner 31. The safety valve 10 is in the state described above in connection with FIG. 1 and remains therefore closed until button 24 is depressed by hand. The final step in setting up the device in its standby state, therefore, consists in manually depressing button 24 until the afterburner 31 ignites, which is indicated by the neon lamp 38, the changes from a flickering state to a uniform radiation state. Finally, the button 24 be held in the depressed position for a few seconds to allow the subburner 31 sufficient time give to heat the thermoelectric device enough for the electromagnet of the valve 10 to be effective

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can. If the button 24 is released too early, closes the valve 10 and the flame on the burner 31 goes out, so that the electrode 37 begins again To emit sparks, and also the neon lamp 38 flickers, thereby indicating that the button 24 for a longer Length of time should be kept depressed.

Once the standby state of the device has been established and it is also assumed that the gas supply does not fail, the standby state is maintained by the device until the predetermined one Time is reached at which the time-controlled valve 30 ensures a gas flow to the burner 13 and the supply to the burner 31 is interrupted.

During the transition from the standby state to the operating state or working state, the safety valve 10 by the current from the thermoelectric device 11 held open, which remains hot enough to deliver enough strong current for a period of time after the flame on the secondary burner 31 is extinguished until the burner 13, the thermoelectric device 12 on a has heated effective temperature in the same way. During the reversal in the standby state at the end of the operating state ensures in the same way the thermal delay at the main burner 13 that the safety valve 10 remains open while the ignition of the secondary burner 31 is carried out.

A further neon lamp (not shown) can be provided for the ignition device 39, so that the presence or lack of flame on the main burner 13 outside of the room to be heated by the burner 13 can be displayed. Such a neon lamp is also used by flickering to indicate that the main burner 13 has gone out during the operating state.

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4 and 5 show in a corresponding manner the standby and operating state of another automatic gas burner according to the invention. Parts in Figs. 4 and 5 which correspond to the parts in Figs. 2 and 3, are marked with the same reference numbers.

In the embodiment of FIGS. 4 and 5, only one time-controlled valve 41 controls the passage of gas to the main burner 13 through the gas line 14, and a thermostatic valve 42 is used for the purpose of allowing gas to pass through to control both the safety valve 10 and the secondary burner 31. A branch line 43 represents a Communication between the valve 42 and the burner 31.

The thermoelectric devices 11 and 12, which are thermal couplings, are arranged so that they be switched by a thermal switch 44 parallel to each other across the windings (not shown) of the valve can. The thermal switch 44 includes a bimetal contact 45 which is arranged to be passed through a heating coil 46, which is connected in series with switches 32 and 34 as shown. If the If the device is in its standby state, which is shown in FIG. 4, switches 32 and 34 close the circuit containing the coil 46, which consequently heats the bimetal contact 45, which in turn defines the position assumes, in which the switch 44 is closed. This makes the thermoelectric device 11 parallel connected to the thermoelectric device 12. In the standby state, the burner 13 receives no gas, whereas the secondary burner 31 receives gas and is ignited by the electrode of the ignition device 36. Consequently the thermoelectric device 11 can generate a sufficiently strong current for the safety valve 10 to the valve 10 in the standby state of the device

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keep open.

During commissioning, the device starts from an "off" state in which the valves 10, 41 and 42 all are closed and switch 34 is open, so that the ignition devices 36 and 39 are not energized or not connected to voltage. To the device To bring the timed valve 41 into its ready state, manually for a selected start time and duration set for the main burner 13 and then the thermostatic valve 42 is manually opened set the desired temperature which the room to be heated by the burner 13 is to receive. In which last-mentioned process gas is then fed to the inlet of the safety valve 10 and the secondary burner 31, and switches 32 and 34 assume the positions shown in FIG. The ignition device 36 begins to operate once switches 32 and 34 are in their shown states, and consequently the Sub-burner 31 ignited by the sparks from electrode 37. Eventually button 24 of valve 10 becomes Manually depressed long enough to ensure that thermoelectric current is from the thermoelectric Device 11 is generated and the valve 10 holds open.

When the timing mechanism (not shown) of the timed valve 41 sets the timing for opening reaches the valve 41, gas passes through the valve 41 to the main burner 13 and the switch 31 takes the a state shown in Fig. 5, in which the coil 46 of the thermal switch 44 is separated from the switch 34, and the Ignition device 39 of the main burner is connected to switch 34, which remains closed. The ignition device 39 is thereby excited and sparks are emitted from electrode 40 on the main burner. The valve 10 is

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held open by the combined effect of the thermal delay on device 11 and switch 44. The main burner 13 ignites in the meantime and warms up the thermoelectric device 12, which generates sufficient current to close the valve 10 in the open state hold during and after the device 11 and switch 44 cool. The device reaches thus their operating or working condition.

It can be seen that the secondary burner 31 during the transition to the working state and during the working state remains switched on.

At the end of the working state or operating state, the time-controlled valve 41 and the switch 32 close, 34 and 44 return to the position shown in Fig. 4, with a certain delay in the case of the thermal switch 44 occurs while contact 45 is at its effective temperature achieved. The device 11 is immediately ready to deliver sufficiently strong current to open the valve 10 to keep, as it is heated over the entire operating state. A thermal delay on the Device 12 bridges the interval during which the bimetal contact 45 moves into its closed position.

If the main burner 13 is extinguished during an operating state, the ignition device 39 seeks the Ignite burner 13 again. If this fails, the burner 13 cools down and the device 12 stops, Generate sufficient current that could cause the solenoid (not shown) of the safety valve 10 holds the armature (not shown), and as a result the valve 10 closes. The extinction of the secondary burner 31 during a standby state produces the same result. Extinguishing the secondary burner 31 during

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a working or operating state has no influence. Furthermore, since the thermostatic valve 42 from which the Secondary burner 31 is supplied, both in the standby mode and in the working state is open and upstream from the safety valve 10, the secondary burner 31 must be designed so that when there is an escape of unburned gas from which an explosive or ignitable mixture of air and gas cannot build up, because there is the possibility of the secondary burner 31 going out, e.g. during a power failure, the prevents the igniter 36 from operating.

6 and 7 show an automatic gas burner according to the invention, which is similar to the embodiment of FIGS. 4 and 5, but a device for Has shutdown of the gas supply to the secondary burner whenever one of the burners accidentally goes out. The components 6 and 7 correspond to those in FIGS. 4 and 5 and are therefore identified by the same reference numerals.

The device of Figs. 6 and 7 is used in the same Used in a manner like that of Figs. 4 and 5, and differentiates differs from the device of FIGS. 4 and 5 only in that it has a double safety valve 50, which controls the passage of gas not only in line 14 but also in branch line 43. The valve 50 makes makes use of the same operating principles as the valve 10 and is shown schematically in FIG. 8 in vertical section.

The safety valve 50 has one body with two Chambers, namely an upper chamber 51 with which the main inlet 16 and main outlet 17 communicate and one lower chamber 52, with which a branch inlet 53 and a branch outlet 54 communicate. The upper chamber 51 contains the valve seat 18 against which the valve body 19 with the

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The stem 20 is biased by the spring 21 housed in the upper chamber 51 of this valve. The shaft 20 extends through a gas seal (not shown) between the upper and lower chambers

51 and 52. The end of the stem which is remote from the valve body 19 is, as in the valve 10, with the Armature 22 is provided, which can be held by the electromagnet 23, which in this valve in the lower chamber 52 is housed. An additional valve body 56 is on the stem 20 in the lower chamber attached and arranged so that it cooperates with a valve seat 55 in the chamber 52.

The valve 55 is shown in Fig. 8 in its blocking position, in which the gas passage from the inlet 16 to the outlet 17 is prevented by the upper chamber 51 by the valve body 19, which is seated on the seat 18. Furthermore, the Gas passes from inlet 53 to outlet 54 through the chamber

52 through the valve body 56, which is seated on the valve seat 55.

When the spring loaded button 24 is manually depressed, the one aligned on the shaft 20 lifts Shank 25 the valve bodies 19 and 56 from their seats. If a sufficiently strong current then flows through the windings of the electromagnet 23, the armature 22 is after pulled or held down and the valve remains open after the button 24 is released.

The device according to FIGS. 6 and 7 has the advantage over that of FIGS. 4 and 5 that if the button 24 is released too early when the user establishes a standby mode, the neon lamp 38 flickers, namely because the gas supply to the Secondary burner 31 is shut off by valve ^ O. A visual indication is thus given that the button 24 has been depressed for a longer period of time.

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is to squeeze.

Suitable or suitable ignition devices are manufactured by the Plessey company and under the Numbers 407/1/72043/001.

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Claims (10)

cäe Wilhelm Eeicbsl MAIN GAS APPLIANCES LIMITED, London, England Claims (1.j Automatic gas burner with a main gas burner and a gas line for supplying gas to the main gas burner, characterized in that that a safety valve (10 ,. Fig. 4) and a timed Valve (41) are successively contained in this line (14) that a first power source (11) for the supply of Electric current with a predetermined strength is provided that a second power source (12) is a thermoelectric Has device which is arranged so that it is heated by gas burning at the main burner (13) during operation, that devices are provided that the current either from. the first (11) or the second source (12) to the safety valve (10) direct that the safety valve (10) is such that it is closed when not manually is kept open or in its open state after a manual opening by either the current of predetermined strength from the first source (11) or a sufficiently strong one Current from the second source (12) is held that the time-controlled valve (41) is provided with devices (32) to ignite the main burner (13) during operation of the time-controlled valve (41) so that gas can be supplied to the main burner (13), and that it also cooperates with devices (44, Fig. 4) which prevent the first source (11) from supplying current to the safety valve (10), while the time-controlled valve (41) makes it possible that gas is supplied to the main burner (13), and that the thermoelectric device (12) is so arranged and constructed is that it generates enough electricity when heated by the gas burning on the main burner (13) during operation is, and that the safety valve (10) through the second source (12) during the combustion of the gas on Main gas burner (13) is controlled. 90 9 8 SO / 0582
ORIGINAL INSPECTED 2Ü1768A 2. Automatic gas burner with a main gas burner and a gas line for supplying gas to the main gas burner, characterized in that a safety valve (10, Fig. 4) and a time-controlled Valve (41) are contained one after the other in this line (14) and a first thermoelectric device (11), a second thermoelectric device (12) which is heated by the gas burning at the main burner (13) during operation and a device is provided, the thermoelectrically generated electricity either from the first (11) or the second thermoelectric device (12) leads to the safety valve (10) that the safety valve (10) is such that it is closed when not manually held open or in its open state a manual opening is held by a sufficiently strong thermoelectrically generated current that the time-controlled valve (41) is provided with a device (32) which causes ignition of the main burner (13), when the timed valve (41) is operated so that gas can be supplied to the main burner (13), and that further devices (44, Fig. 4) are provided which prevent the first thermoelectric device (11) thermoelectric current leads to the safety valve (10), while the time-controlled valve (41) allows that Gas can be supplied to the main burner (13) that the first thermoelectric device (11) has sufficient current can generate depending on their heating by the device (31) for heating the first thermoelectric Device and the second thermoelectric device (12) is arranged and designed so that they have a sufficient can generate strong electricity if it is heated by gas that burns on the main burner (13) during operation and that the Safety valve (10) through the second thermoelectric device (12) during the combustion of the gas on the main gas burner (13) is controlled. 909850/0582 OBiGlNAL INSPECTED 3. Automatic gas burner according to claim 2, characterized in that that the device (31) for heating the first thermoelectric Device (11) is an auxiliary burner (31) and the first thermoelectric device (11) is arranged so that it can be heated by the gas which burns at the secondary burner (31). 4. Automatic gas burner according to claim 3> characterized in that that a branch line (43, Fig. 6) is provided to gas from the gas line (14) to the secondary gas burner (31) and that the gas flow to or through the branch line (43) is controlled by the safety valve (50, Fig. 6). 5. Automatic gas burner according to claim 4, characterized in that that the time-controlled valve (30, Fig. 2) is a two-way valve and allows gas to flow only into the branch line, when it prevents gas flow to the main gas burner (13), the time-controlled valve (30) having the device, which prevents the first thermoelectric device from applying thermoelectric current to the safety valve (10) leads, while the timed valve (30) allows gas to be supplied to the main gas burner (13). 6. Automatic gas burner according to claim 5, characterized in that that the first (11) and second thermoelectric device (12) are both coupled to the safety valve (10), regardless of whether gas is supplied to the main burner (13) will or not. 909850/0582 7. Automatic gas burner according to claim 3, characterized in that that a branch line (43) is provided to lead gas from the gas line (14) to the secondary burner (31) and the Gas flow through the branch line (43) remains unaffected by the state of the time-controlled valve (41) that the Device (44), which prevents the first thermoelectric device (11) thermoelectric current to the Safety valve (10) leads, while the time-controlled valve (41) allows gas to the main burner (13) is in the form of an electrical switching device (32, 45, 46) which is so arranged and it is controlled by the timed valve (41) that thermoelectric voltage is prevented from being generated applied in sufficient strength by the first thermoelectric device (11) on the safety valve (10) while the timed valve (41) allows gas to be supplied to the main burner (13). 8. Automatic gas burner according to one of claims 3 to 7, characterized in that electrical circuits (36, 39) are provided to the Ignite main and secondary burners (13, 31) and a thermostatic valve (33 or 42) is contained in the gas line (14), which enables ignition of the secondary burner (31) when the thermostatic valve opens, the time-controlled valve (41) preventing gas from being supplied to the main burner (13). 9. Automatic gas burner according to one or more of the preceding claims for an automatic household stove, characterized in that the first thermoelectric device (11) and its device (31) are attached for heating or warming outside the oven space in which food is used for cooking will. 909850/0582
ORIGINAL INSPECTED 10. Automatic gas burner according to one of claims 2 to 8, characterized in that that electrical devices (39) for igniting the main burner (13) and electrical devices (36) for Ignition of the secondary burner (31) are provided and each of these electrical devices a flame-sensing Ignition electrode (47 or 37), which in the excited state gives off electrical sparks when it is surrounded by a mixture of gas and air and stops giving off sparks, when it comes into contact with a flame. 909850/0582