DE2044712A1 - Ignition device for fuel burners - Google Patents

Description

R. WOODS

«9 Λ UG SBUIlG

well », ata * ·

ü.

Augsburg, September 7, 1970

Robertshaw Controls Company, 1701 Byrd Avenue, Richmond,

Virginia, V. St. A, ||

Ignition device for fuel burners

The invention relates to ignition devices for fuel burners with one the fuel flow to the relevant Burner regulating valve.

The recent development in the field of ignition of

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Fuel burners are going instead of those previously used Pilot or pilot flames to use electric igniters. When using such electric igniter, it has been shown that the burner operation by the igniter can be monitored even if the ignition element consists of a material whose electrical resistance is with the temperature changes, i.e. if the resistance of the detonator is a puncture of the temperature at the detonator, so that the operation of the igniter in question and the associated burner is improved by utilizing the igniter resistance can be.

As a result of the dangerous conditions that can result from incorrectly working ignition systems, it is necessary that such systems in the event of a failure of any part or an interruption in the power supply, respectively switch off immediately. In particular, it is important that the valves supplying fuel to the burners only are then open when the required ignition temperatures are available, in order to prevent the outflow of unburned material Prevent fuel. It is also desirable that the institutions try again by themselves to initiate an ignition if the ignition temperatures are temporarily not or were not given, e.g. if after

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an interruption of the electrical current starts again or if the valves have closed due to faults present in the devices, so that the burner devices work fully again as soon as there are no more disturbing factors.

Although the resistance of electrical detonators is already * used in the manner described above in various ignition systems that have already been proposed, such ignition systems are still ^{J in terms of design and function}

not mature and do not have the required comprehensive malfunction safety properties and Recommissioning affiliations. In addition, with these ignition systems that have already been proposed, the temperature-variable resistance properties of the electrical detonator elements are not fully exploited.

The object of the invention is to be achieved

better φ for ignition devices of the type mentioned above

Malfunction safety properties and recommissioning properties to achieve, the device being simple and inexpensive to manufacture and maintain should be.

109811/1 5 81 offlOWAL

This object is further achieved according to the invention by connection means for connection to a power source by an electric igniter that can be attached near the ignition point of the burner in question, further by a switch arrangement connecting the igniter and said valve to the connecting means, furthermore by control means connected in this way to the circuit of the igniter and coupled to the switch arrangement, that they respond to the voltage applied to the igniter and as a function of this igniter voltage control the switch arrangement, and finally by with the circuit of the detonator so connected and also coupled with the switch arrangement further control means solved that the latter depending on each through the igniter current flowing control the switch arrangement.

According to a further embodiment of the invention, said object is achieved by connecting means for connecting to a power source, furthermore by one connected to the connection means, in the vicinity of the ignition of the burner in question attachable electric igniter with positive temperature coefficient of resistance, further through a current-carrying arrangement connected to the igniter, and finally through

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Control means solved, which with the current sensor arrangement and the valve are connected in such a way that this valve depends on the flow through the igniter Electricity is controlled.

The ignition device according to the invention is complete fail-safe, extremely responsive and it always starts again after the error has been eliminated initiate ignition by itself.

The advantages achieved according to the invention result in particular from the fact that the electric igniter both as an actual detonator and as a temperature ■ for overhead is used.

In a special embodiment of the ignition device according to the invention, an electrical igniter with a positive temperature coefficient of resistance is used, which not only serves as an actual igniter and as a temperature sensor, but also as a control element .

According to a special feature of the invention , a voltage sensor arrangement is connected in parallel with the electric igniter, through which the valve

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speed is controlled by the temperature prevailing at the igniter.

According to a special feature of the invention, both the one flowing through the electric igniter Current as well as the voltage applied to this detonator for control and safety purposes used.

According to yet another feature of the invention, there is one connected in parallel to the electric igniter Holding coil Application which is used to control a switch while simultaneously using a hot wire or a similar element, which expands through its own current heat, is connected in series with the igniter and to the Control of a further switch is used, both switches controlling said valve together.

Further features and advantages will become apparent to those skilled in the art from the following description of two Embodiments of ignition devices shown in the drawings, serving only as examples the invention. They represent:

Fig. 1 is an eohematic representation

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^ SPSCTED

an ignition device according to the invention,

Fig. 2 is a schematic representation

the one in Pig. I shown ignition device after a successful ignition,

3 shows a schematic representation

the ignition device shown in FIG in their malfunction safety position,

4 shows a schematic representation

Another embodiment of an ignition device according to the Invention, and

5 shows a schematic representation

yet another embodiment of an ignition device according to the invention.

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The one in the Pig. 1, 2 and 3 of the drawings Ignition device is used to operate a fuel burner 10. An electrically operated fuel supply valve 12 connects the burner 10 to a suitable fuel source not shown in the drawings, and regulates the fuel flow leading to this burner 10. The valve 12 can be made by any suitable electrical actuators such as a solenoid or a thermal engine. Close to the ignition an electric igniter 14 is arranged in the openings 10, which one has a positive resistance temperature characteristic comprising material, e.g. molybdenum disilicide.

A housing 16 drawn in dashed lines has two input terminals 18 and 20 to which the secondary winding 22 of a transformer 24 is connected to a primary winding 26, the latter being connected via a thermostat switch 28 to a current source (not shown). The terminal 18 is connected to a stationary contact arm JO which is attached to the housing and carries a contact J52. The contact 32 forms a switch 36 with a further contact J> h interacting with it.

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The contact 34 is attached to a movable contact arm, one end of which is secured by a pin 40 in FIG the housing 16 is pivotably articulated. A helical compression spring 42 is biased between the with Referring to the drawings, upper surface of movable contact arm 38 and housing 16 clamped. The free End 44 of the movable contact arm 38 is with a eye 46 provided, in the opening one end of a Tension spring 48 is attached. The other end of the mainspring 48 is hung on an eye 50, the latter on a long lever arm 52 of an L-shaped lever 54 is provided. The lever 54 is pivotably articulated in the housing 16 by means of a bearing pin 56 and is a short lever arm 58 of lever 54 is at one end an electrically conductive hot wire 60 or a similar element which expands in each case by its own heat attached. The other end of the hot wire 60 is fastened to the housing 16 by means of a screw 62 and electrically connected to the terminal 20. The hot wire 60 has such a thermal expansion characteristic on that it expands when heated and when cooled contracts. At normal room temperature, the hot wire 60 takes its proportions shown in FIG contracted position

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A helical compression spring 64 is clamped under pretension between the housing 16 and the free end of the lever arm 52 of the lever 54. A pin 66, which projects upwards with reference to the drawings, is attached to the upper side of the lever arm 52 of the lever 54 and rounded at its free end 68, the latter in each case resting on the underside of the movable contact arm 38. An annular collar 70 of the pin 66 rests against the lower side of a movable contact arm 72, which is pivotably mounted in the housing 16 by means of a bearing pin Jk.A compression spring is clamped under pretension between the underside of the movable contact arm 38 and the upper side of the contact arm 72 . The contact arm 72 carries a contact 78 which, together with a further contact, forms a switch 82. The contact 80 is attached to a stationary contact arm 84, which in turn is attached to the housing 16 «

The housing 16 has three output terminals 86, 88 and 90. The clamp 86 is within the housing 16 electrically with the contact arms 38 and 72 and via a Line 92 is connected to a connection 94 of the igniter 14. Another connection 96 of the igniter 14 is via a Line 98 is connected to the connection 88, which

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is connected to the hot wire 60 via a line 100 within the housing 16. The terminal 90 is connected within the housing 16 to the contact arm 84 and also connected via a line 102 to a connection 10 ¹ J of the valve 12. Another connection 106 of the valve 12 is connected to the input terminal 20 via a line 108.

A holding coil 110 has two winding parts which are connected in parallel to the igniter I ^{1 I via lines 112 and H 1 I.} A center tap 116 of the holding coil 110 is connected to the line 112 via an input terminal 108 of the housing. The line 11 ¹ I is connected to the two outer ends of the two winding parts of the holding coil 110 via an input terminal 120 of the housing 16 and via two oppositely polarized full-wave rectifier diodes 122 and 12 ^{1 I.} The holding coil cooperates with an armature 126 which is attached to the upper side of the movable contact arm 38.

The thermostat switch is 28 during operation normally open and the ignition device assumes the position shown in FIG. 1, that is, the device no power is supplied because the switch is open so that the fuel valve 12 is closed

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PL

is held and the igniter 14 is not energized. Of the Hot wire 60 is cold because there is no current flowing through it, and it assumes its contracted position, in which the pivotable long lever arm 52 counterclockwise against the force of the compression spring 64 was moved so that the pin 66 moved the contact arm 38 against the force of the compression spring 42 upwards and contacts 32 and 34 of switch 36 are closed flfc were. Contacts 78 and 80 of switch 82 are owing of the contact arm following the collar 70 of the pin 66 open at this time.

As soon as the thermostat switch 28 is closed and hereby indicates that the burner is to be put into operation, current overflows from the input terminal 18 switch 36, line 92, igniter 14, lines 98 and 100, and hot wire 60 to the terminal 20 so that the igniter 14 is energized and the hot wire 72 begins to heat up. Since the detonator 14 a has positive temperature coefficient of resistance, is the initial voltage drop across igniter 14 small and insufficient for the holding coil 110 to attract the armature 126 and the largest initial voltage drop occurs over hot wire 60. It should be noted that the holding coil 110 with respect to the one on the igniter 14

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pending voltage must be very sensitive and therefore it it is not necessary for the holding coil 110 to close the armature 126 in the sense of closing the switch can attract, but this' holding coil 110 must only be able to hold the armature 126, since the switch 36 at Start of operation closed 13t

The current flowing through the hot wire βθ heats this hot wire and expands it so that the compression spring 64 can pivot the lever 5 ¹ I clockwise.By moving the lever 54, the pin 66 is moved such that the contact arm 72 is moved by the compression spring 76 is pivoted clockwise and the contact arm 38 is free to pivot clockwise, as shown in Fig. 2, which shows the state of the ignition device after successful ignition. If the igniter 14 has already reached the ignition temperature at the point in time at which the rounded

If the free end 68 of the pin 66 moves away from the contact arm 38, the resistance of the igniter lh is correspondingly high as a result of the positive temperature coefficient of resistance and as a result the voltage drop given to the igniter l't is sufficiently high to close the holding coil 110 ao excite that it keeps the switch 36 closed. That is, on the holding coil

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is the same voltage as that at the igniter 14, since it is parallel connected to this igniter 14 and this Holding coil 110 is only energized sufficiently to hold armature 126 when igniter 14 Has ignition temperature. The diodes 122 and 124 effect a full-wave rectification of the holding coil 110 exciting Current so that noises and rattling are avoided when the holding coil is close to falling

The switch 82 has been closed by pivoting the contact arm 72 clockwise and the valve 12 is controlled by the input terminal 18 Current flowing via switch 36, switch 82 and lines 102 and 108 to output terminal 20 excited. Accordingly, if the igniter 14 is within a certain period of time between closings of the thermostat switch 28 and the expansion of the hot wire 60 reaches ignition temperature, the valve 12 is opened and the burner 10 is supplied with fuel.

If, for any reason, the igniter 14 does not reach the ignition temperature by that point in time has, in which the current flowing through the hot wire 60 has heated this hot wire so far that

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As a result of its expansion, the compression spring 65 pivots the lever 5k clockwise, so the switch 36 is opened, since the contact arm 38 follows the movement of the pin 66 connected to the lever 5k as a result of the force of the compression spring kZ. By opening the switch 36, the current coming from the secondary winding 22 is interrupted and consequently the igniter Ik is de-energized and the valve 12 is closed. It can be seen from this that the valve 12.

from the operation of the two series-connected switching ^

• - m

ter 36 and 82 is dependent, and that the valve 12 does not open in each case, unless the igniter Ik has ignition temperature. The contacts 32 and "3k of the switch 36 break their connection before the contacts 78 and 80 of the switch 82 touch each other, so that it is ensured that if the igniter 14 fails to reach the ignition temperature within the predetermined time, the valve 12 does not open «

Opening the switch 36 also prevents ™

that current flows through the hot wire 60 so that this hot wire 60 can cool down and contract and the lever 5k is pivoted counterclockwise so that the contacts 32 and 34 of the switch 36 are closed by means of the pin 66. In this way

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the device returns to the state shown in Fig. 1 and it begins again to initiate an ignition process until the igniter I ² J has reached the correct ignition temperature within the predetermined time.

If, as ™ shown in Fig. 2, any electrical interruption occurs during normal operation of the ignition device according to the invention, the holding coil 110 is de-energized so that the armature drops 126 and by the force of the compression spring, the switch k2 36 is opened, whereby the igniter I ^ is disconnected from the electrical connection side, the valve 12 is closed and the flow of current through the hot wire 60 is interrupted. Here, the ignition device according to the invention assumes the fail-safe state shown in FIG. 3.

Since no current flows through the hot wire 60, it cools down and it contracts, whereby the lever 5 ¹ J is pivoted counterclockwise and the ignition device according to the invention is placed in the state shown in FIG. 1, so that an ignition process is initiated again is possible. That is, if the thermostat switch 28 is still closed when again

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If electricity is available, the burner is automatically re-ignited in the manner described above.

If, for whatever reason, the igniter Ik is disconnected from the ignition device according to the invention, if this detects the in Pig. 2 assumes the operating state shown, the voltage present at the holding coil 110 increases so strongly that this holding coil 110 prevents the switch 36 from being opened. However, since the hot wire is connected ^{in series with the igniter I 1} I, the current flowing through this hot wire 60 is interrupted and this hot wire cools down. As already mentioned above, the hot wire 60 contracts as it cools, whereby the lever 5 * 1 is pivoted counterclockwise and the pin 66 lifts the contact arm 72 and, as a result, the switch 82 is opened so that the valve 12 closes. The ignition device remains in this state until the igniter 14 is properly connected again. If the igniter 14 is short-circuited for any reason, the voltage applied to it drops to the value zero, so that the holding coil 110 can no longer hold the armature and the armature drops out, whereby the switch 36 is opened and the valve 12 is closed. If the hot wire 60 breaks for any reason, this is the over

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the igniter 14 leading current path interrupted so that the armature of the holding coil 110 drops out and the contact arm follows the lever 54 under the force of the compression spring 42 and so that the switch 36 is opened. If a short circuit occurs across the hot wire 60, it cools Hot wire off and he pulls together, “taking the switch 82 remains open as a result of the raised contact arm 72.

In the event of failure of the igniter 14 as a result of its cooling, a, B »by the fuel flow, the voltage present at the igniter 14 and the holding coil decreases in accordance with the cooling falling resistance of the igniter 14, It has been shown that the igniter can cool down so much that ignition is prevented while the voltage drop is reduced on the igniter is not yet sufficient to let the armature of the holding coil 110 fall off. To the invention To make the ignition device fail to function properly even for such a cooling down of the igniter, swipe the lever and the movable contact arm 38 is clamped in a tension spring 48 with preload. The reduction of the resistance of the igniter 14 due to cooling causes & dureh a larger current flows through the hit wire 60 which the hot wire continues to expand and thereby

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11/15 81

the lever 54 is pivoted further clockwise can be held more and is released, although the voltage applied to the holding coil 110 has a greater value than the voltage normally applied to this holding coil 110. Accordingly, it can be seen that the ignition device according to the invention is extremely sensitive to external conditions through which the igniter 14 can cool down, since the armature 126 responds to the voltage drop of the igniter 14 and also to the current flowing through the igniter Ik. That is, the ignition device according to the invention can, depending on internal or external incorrect influences

Enter a state of malfunction even if the supply voltage rises above or below normal values or drops, since an increase in voltage causes a stronger one Current in the hot wire 60 and thus an opening of the switch According to 36, while a voltage drop has a drop in the armature of the holding coil 110 and thus likewise an opening of the switch 36 has the consequence.

Another embodiment of the invention

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to

Ignition device is shown in Figure 4 of the drawings and parts which are identical to corresponding parts in FIG. 1 are again given the same reference numerals designated.

The ignition device according to the invention shown in FIG. 4 differs from that shown in FIG Embodiment basically in that the fuel valve 12 is connected directly in parallel with the hot wire 60, rather than both the igniter 14 and also to the hot wire 60, as is the case in the embodiment shown in FIG. 1. In this sense is the line 102 of the valve 12 to an output terminal 1028 connected, which in turn is connected to the movable contact arm 72 within the housing 16. One Line 130 connects terminal 88 to terminal 90, see above that after a successful ignition current from the terminal 18 via the switch 36, the line 92, the igniter 14, the φ leads 98 and 100 and the hot wire 60 to terminal 20 can flow, while also current from the terminal 18 via the switch 36, the line 92, the igniter 14, the Lines 98 and I30, the switch 82, the line 102, the Valve 12 and line 108 to terminal 20 can flow. Since the valve 12 is connected directly in parallel to the hot wire 60 is, this hot wire 60 is more sensitive to

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Current changes in the facility.

The embodiment shown in Pig, 4 works in the same way as the Ausführungstingsform shown in Figs. 1, 2 and 3, so that the puncture will not be described again for the purpose of the shortest possible description.

Yet another embodiment of the invention is shown in Fig. 5 and parts which are identical to corresponding parts of the embodiment shown in Fig. 1 again have the same reference numerals and are not repeated below described. Parts which correspond to parts in Fig.l are only similar, each again have the same reference numbers, but increased by 200.

The ignition device shown in Fig. 5 differs differs from the embodiment shown in Fig. 1 in that a transformer 224 with a tapped secondary winding is provided with the winding parts 222 and 223 to thereby the valve 12 to operate with a higher voltage. In this sense, line 108 of valve 12 was connected to an inlet terminal 221 arigeechloaaen and the input terminal 20 iat

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connected to a center tap of the secondary winding. In order to prevent the valve 12 from being subjected to only half the voltage of the secondary winding, a three-way switch 236 is provided in place of the switch 36 shown in Pig, I. The switch 236 contains a switching piece 23 ¹ J carried by the movable contact arm 38, as well as a contact 32 and a contact 235, the latter being fastened to a stationary contact arm 237, which in turn is fastened to the housing 16. The contact arm 237 is connected to an output terminal via a line 239.

The puncture of the embodiment shown in Fig. 5 is similar to that already with reference to Fig. 1,

and 3 function described. After the thermostat switch 28 is closed 13t, the igniter 14 is controlled by the terminal 18 via the switch 236, the lines 239 and 92, the igniter I ² I, the lines 98 and

100 and the hot wire 60 to the terminal 20 are energized. The valve 12 remains open at this time, since switch 82 is still open. However, when the hot wire 60 is heated and has expanded, daa becomes Valve 12 as a result of the pressure from terminal 18 via switch 236, the switch 82, the line 102, the valve 12 and the line 108 to the terminal 221 of the current flowing gaachloaaan,

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since then the igniter 14 has ignition temperature, like this above with reference to those in Pig. I illustrated embodiment of the invention has been described.

The embodiments shown in FIGS are fail-safe in the same way as that with reference to FIGS. 1, 2 and 3 has been described.

Accordingly, it can be seen that according to the invention the temperature-variable resistance of the igniter as well as the resistance flowing through this igniter Current as well as the voltage applied to the igniter is used to generate the mentioned to achieve fail-safe operation. aside from that it can be seen that the voltage and current sensing and simultaneously controlling means according to the invention cooperate in such a way that an increase in the current permits an increase in the dropout voltage.

The ignition device is within the scope of the invention in many ways with regard to the individual cell

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XH

design and function of individual parts can be modified so that the preceding description relating to the drawings is to be understood only in an illustrative sense, but not in a limiting sense.

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Claims (10)

Claims; l 7} Ignition device for fuel burners with a ^{valve regulating the fuel flow to the relevant burner 1} , characterized by connection means (18, 20, 24) or, 18, 20, 221, 224) for connection to a power source. ,, furthermore by an in Electric igniter (14) which can be attached near the ignition of the burner (10) in question, further through a switch arrangement (36, 82 or 236, 82) each connecting the igniter and said valve (12) to the connecting means, further through to the igniter circuit control means (110, 122, 124, 126) connected to and coupled to the switch arrangement in such a way that they respond to the voltage present in each case on the igniter and control the switch arrangement as a function of this igniter voltage, and; finally by further control means (60, 54, 42, 48, 64, 76) connected to the circuit of the igniter in this way and also coupled to the switch arrangement, so that these control the switching door arrangement as a function of the current flowing through the igniter **. 2. Device according to claim l _t characterized in that diieSetialteranordiiung one of the said one 25 * Sfceuerm means (110, 122, 124, 126) controlled switch (3β or 236) and one of the others mentioned Control means (60, 54, 42, 48, 64,? 6) controlled further switches (82), that these two switches between the electrical connection means (18, 20, 24 or 18, 20, 221, 224) and the valve (12) are connected in series so that to open the valve both switches must be closed or must be closed. 3 · Device according to claim 1 or 2, characterized characterized in that the electric igniter (14) has a has positive temperature coefficient of resistance and that said control means (110, 122, 124 * 126) are connected in parallel to this detonator. 4. Device according to claim 3, characterized in that that the electric igniter (14) each damn has a relatively high resistance when it is on ignition temperature, and that the mentioned one Control means (110, 122, 124, 126) a holding coil (110): exhibit. 5. Device according to claim 4 * characterized gekenazeichnötj that the electric igniter (14) has two 20U712 η. Conclusions (94, 9β) has that furthermore the holding coil (110) has two winding parts, which are connected on the one hand to one with one (96) of the connections of the igniter U4) Tap connected to each other and the other with their respective other ends in each case via a diode (122, 124) with the respective other Terminal (94) of the igniter are connected, and that the both diodes are polarized opposite. 6. Device according to one of claims 3 to 5 * characterized in that said further control means (60, 54, 42, 48, 64, 76) with the electrical Igniter (14) are connected in series. 7. Device according to claim 6, characterized in that that said one control means (110, 122, 124, 126) have a Hafcepule (110) and that the said further control means (60, 54, 42, 48, 64, 76) a hot wire (60) or something similar that is heated when have expanding element. 8. Device according to claim 7, characterized in that that the switch arrangement (36, 82 or 236, 82) contains a lever (54), which on the one hand with - 27 - 10 9811/1581 ORIGINAL INSPECTED the hot wire (6O) is connected and from the latter can be moved and on the other hand in the sense of a control with the aforementioned two switches (36, 82 or 236, 82) is connected. 9. Device according to claim 8, characterized in that said one switch 06 or 236) is normally kept closed and one ^ Contact arm (38) with an anchor (126), which the latter is under the control of the holding coil (110), that further this contact arm is pretensioned towards said lever by spring force (42), that further the hot wire (6O) a contracted cold state, .by which the lever a very specific Position is given, and on the other hand can assume an extended warm state, through which the latter the lever is given a certain other position, the lever said one switch in each case W then keeps closed when he says a position occupies. 10. Device according to claim 9 *, characterized in that that said further switch (82) each. is then open when said lever (54) .is assumes a position while this further switch - 28 109811/1581 IS Is always closed when the lever assumes its other position mentioned, that furthermore the said holding coil (110) holds the armature (126) when it is excited and holds the said one switch (36 or. 236) in its closed position when the Igniter (14) has its mentioned high resistance at ignition temperature, that further, when the igniter is excited, the hot wire (60) is placed in its extended hot state and the lever is brought into its mentioned further M position and thus the mentioned further switch (82) is closed and that finally said one switch is held in the closed position on the one hand to open the valve (12) when the igniter has ignition temperature, and on the other hand is opened when the igniter is not at ignition temperature . - ■■■■ "■ ·, '■■■ 11. Device according to claim 10, characterized in that the ^ valve (12) to the hot wire (60) is connected in parallel. 12. Device according to claim 10 or II, characterized in that the electrical connection means have a transformer secondary winding (222) with two eridseltlgen - 29 - 10 9811/1581 Have connections (18, 221) and a tap (20), to which the hot wire (6o) is connected, while to one of the two end connections (221) the valve (12) is connected, and that said one switch (236) has three contacts, one of which a contact (32) on the other end concerned Terminal (18) of the secondary winding is connected, while another contact (235) with the electrical Igniter (14) is connected and the third contact (34) which is attached to said contact arm (38), is connected to said further switch (82) and to the first-mentioned two contacts in each case can be connected at the same time (Fig. 5) 13. Device according to one of claims 10 to 12, characterized in that between said contact arm (38) and said lever (5 ¹ I-) a tension spring (48) is tensioned so that even with an undesirably strong, by the Hot wire (60) flowing through it, by which the voltage applied to the electric igniter (14) increases, the armature (126) from the Holding coil (110) is released in time. 14, device according to one of claims 1 to 13 «characterized in that between the switch 109811/1581 arrangement (36, 82 or 236, 82) and the above further control means (60, 5V 42, 48, 64, 76) means to increase the voltage applied to the electric igniter (14) at which the said control means (110, 122, 124, 126) are actuated when the current of the igniter is on a certain value increases. 15. Ignition device for fuel burner with ^v - · · ■ ■ ■ · '■■■■ - ■. a valve regulating the fuel flow to the relevant burner, characterized by connection means (18, 20, 22, 24, 26 or 18, 20, 222, 223, 224, 26) for connection to a power source, furthermore by a connection means connected to this , electrical igniter (14) with a positive temperature coefficient of resistance which can be attached near the ignition of the burner (10) in question, further through a current sensor arrangement (60) connected to the igniter, and finally * through control means (110, 122, 124, 34, 82, 54, 42 , 48, 64,? 6 or 110, 122, 124, 236, 82, 42, 48, 64, 76), which are connected to "the current sensor arrangement and the valve (12) in such a way that this valve is dependent on the current flowing through the detonator is actuated . .. '.'. "'"'.'" ■ "'. *"'' ■ """" - " - 31 .- ■■■ ORIGINAL INSPECTED 109811/1581. 2Ü4A712 Qi l6. Device according to claim 15 * characterized in that that the current sensor arrangement (6o) is connected in series with the electric igniter (14). 17 · Device according to claim 15 or 16, characterized in that the control means are a switch arrangement (36, 82 or 236, 82) which start with the valve (12) and the electrical connection means (18, 20, 22, 24, 26 or 18, 20, 222, 223, 224, 26) is connected in series. 18. Device according to claim I7, characterized in that that the current sensor assembly one through the current flowing through it in each case heatable hot wire (60) or a similar one by means of current heat each having expanding element. 19. Device according to claim 8, characterized in that the control means have a lever (54), Which is connected to the hot wire (60) or the like. And from this in each case in the sense of a control of the said switch arrangement (36, 82 or 236, 82) is movable. 10 9 8 11/15 8 1 L e r s e i t e