FR2504241A2 - SEQUENCER FLAME CONTROL DEVICE FOR BURNER APPARATUS - Google Patents

Abstract

FLAME CONTROL DEVICE WITH SEQUENCER, ESSENTIALLY INCLUDING AN ELECTRONIC SEQUENCER 1, A SWITCH WITH MULTIPLE POSITIONS 2, A SAFETY LOGIC ASSEMBLY 5 AND TWO CIRCUITS SWITCHES 8 AND 20, ONE OWN TO INTERRUPT THE GAS SUPPLY, (ELECTRO-VALVE 16), THE OTHER TO INTERRUPT THE PRODUCTION OF SPARKS (ELECTRODE 17 WITH LIMIT SPLITTER 15); AN ADDITIONAL SWITCH 19 ALLOWS TO PRODUCE SPARKS ON THE IGNITER AND THEREFORE IGNITION ON THE BURNER OF WHICH THE SUPPLY VALVE IS OPEN.

Description

Flame control device with sequencer, for

burner appliances.

  The present invention relates, as the request for

  main patent, a flame control device

  quenceur, for burner appliances, for automatic control

  matic and cyclic, via an appropriate igniter

  property, presence and absence of a flame according to

  an adjustable duty cycle, the user being able to determine

  reduce by a command the ratio between the duration T 1 of the presence of the flame and the total duration T or cycle period. The purpose and benefits of these devices have been

  described in the main application, and more particularly-

  when they comprise, in accordance with the basic invention: a sequencer essentially consisting of electronic circuits, capable of supplying control pulses

  whose cyclic ratio T 1 * / T can be determined by the ac-

  user on a multi-position switch

  tions; a logical security system, receiving in particular,

  as input signals, the output signal of said sequence

  heart and a signal from a flame detection electrode associated with the burner concerned, this latter signal being representative of the presence or absence of flame; and a switch circuit interposed between, on the one hand a power source and on the other hand the igniter associated with said burner and a solenoid valve or the like, for controlling the supply of fuel to the burner, this switch circuit essentially receiving, as a command input signal,

  the output signal of said safety logic assembly.

  The object of the invention which is the subject of the present addition is to provide additional advantages to this type of device. According to the main patent application, indeed, are

  in principle two electrodes or spark plugs: one

  ignition electrode and a flame detection electrode to provide information to the sequencer In other words,

250 424 1

  an igniter with two electrodes is used: one of production

  tion of ignition sparks, and one of flame detection.

  The downside to using two candles is that

  complicates assembly and increases the price.

  If, on the other hand, only one candle or electrode was used, another drawback would appear, since there would be interference from the signals leaving this candle to go on the one hand to the sequencer and on the other hand

towards the igniter.

  The object of the invention which is the subject of the present application

  first addition certificate is to avoid these inconveniences

  nients, and for this purpose, it is provided, for the most part, that only one candle is used with auxiliary damping spark gap and with a double interruption system instead of one, the one to stop the gas supply

  and the other to interrupt the production of sparks.

  According to the present invention, it is possible to have a common igniter for all the lights, whereas according to the invention which is the subject of the main patent application, there is a need for a specific igniter for the sequential burner and

  another igniter for other burners operating

  classic stove or other appliance.

  In other words, the improved device which is the subject of the present application, of the general type mentioned at the start, can be characterized essentially in that it comprises a sequencer essentially consisting of electronic circuits, capable of supplying control pulses.

  whose duty cycle T 1 / T can be determined by the utility

  reader: a logical security unit that receives in particular

  as input signals in the case of this application

  tion, the output signal from said sequencer and a pro-

  coming from the flame detection electrode (electrode which also allows the production of sparks for ignition),

  associated with the burner concerned, this last signal being represented

  feeling the absence or presence of a flame; and a multi-position switch allowing the on-off function of the system, the choice of sequences and

  resetting the safety state.

  The provision cited last makes it possible to avoid

  the presence of a special switch such as the interrup-

  It resets the main request to zero.

  This arrangement therefore makes it possible to group all the commands of the sequential burner in a single rotator or

  switch The latter will, in fact, allow selection-

  the on-off functions of the system and the different

  your sequences; in addition, it will be used to reset the

  safety status by simply switching to the rear position

  rêt. The invention therefore makes it possible overall to obtain the following advantages: Blocking of the solenoid valve if the ignition has not been successful after a predetermined period;

  Attempt to relight in the event of temporary disappearance

  flame flame; Each time the system is restarted, an ignition cycle will start; and The sequence selection switch will allow the system to be reset when it, having not

  flame detected, will have gone into safety.

  An embodiment of the invention will now be

  described by way of nonlimiting example, with reference

  this in the figures of the appended drawing in which FIG. 1 schematically represents, by blocks,

  an electronic sequencer flame control device

  that in accordance with the invention; Figure 2 shows the electronic sequencer itself;

  Figure 3 shows some signals developed by the-

  says sequencer; Figure 4 shows in more detail an embodiment

  possible of said safety logic assembly, of said switching

  tor and their respective connections with the igniter and with the solenoid valve for controlling the supply of fuel to the burner; Figure 5 is a diagram showing the different operating states; and

  FIG. 6 shows a second possible embodiment

safety logic.

  In Figure 1, there is shown in 1 the electric sequencer

  control, which is associated, as indicated above, with a multi-position switch 2, intended to be operated

  checked by the user in order to perform the various functions

  previously mentioned (choice of sequences, delivery to

  zero, on-off of the sequencer) Output 3 of the sequencer

  the heart is connected to an input 4 of a logic set of se-

  curity 5 of which two outputs 6 and 11 are connected respectively-

  ment at inputs 7 and 12 of two switch circuits 8 and 20 Another output 9 of set 5 is connected to

  a warning lamp 10, for signaling the safety state.

  As can be seen in the diagram, the interrupted circuits

  tors 8 and 20 interposed between, on the one hand the 220 V network -

  Hz, constituting the power source and represented by the terminals 13, and on the other hand

  the winding 16 of the rear control solenoid valve

  gas to the relevant burner on the stove or other appliance, and

  the igniter 14, for example an electronic igniter.

  This igniter also has an auxiliary spark gap

  as well as an electrode 17 allowing the production of

  sparks intended to ignite the combustible mixture and the

  flame detection, thus allowing the emission of a

  gnalr representative of the absence or presence of com-

  bustion This electrode can also be used for re-ignition.

  Sequencer 1, as described in the patent application

  main, will be used to establish the different cycles.

  FIG. 2 gives an example of a sequencer 1 which implements a binary counter 32 The circuits are supplied from the network 13 via a supply

direct current 33.

  A shaping circuit 21 supplies the bi-meter

  nary 32 of the pulses in synchronism with the alternating current of the network The binary counter 32 provides signals whose frequency is the result of divisions by whole powers of 2 of the frequency of the network In

  the example considered, outputs 22, 23 and 24 of the different

  divider rents are used and processed by the circuit

logic 25.

  The double switch 2 allows you to choose the sequences

  these opening the valve 16, as well as supplying the

electronic part or not.

  The positions correspond successively to the stop,

  in permanent operation, when the valve opens during

  during half, quarter and eighth of the duration of the cycle

  cle The cycle time in this example is 40.96 se-

  conditions (= 20 ms x 2048) Passing through the switch off position will automatically reset

  of the system in case the latter is in posi-

  safety tion The corresponding outputs, that the

  The reader can therefore selectively connect to the output 3 of the sequencer 1 via the switch 2, have been referenced respectively 26, 27, 28, 29 and 30 The last three are the outputs of the logic circuit 25 Le

  passage from the stop position 26 and 26 b to the operating position

  Thanks to circuit 31, it can generate an im-

  drive which resets the counter to zero; thus, each

  that commissioning of the system (or reactivation)

will start with an ignition phase.

  In Figure 3, the logic states are shown.

  Figure 4 represents a diagram of the logic of se-

  curity provided by logic set 5, and the links

  with the other sub-assemblies of the device in FIG. 1.

  The opening of the switch circuit 8 is obtained if

  either of the following two conditions is satisfied

you

  the switch 2 of the sequencer 1 provides on its output

  tie 3 a logic state zero; the output of door 36 is in the zero state (lockout). On the contrary, the switch circuit 8 is closed if either of the following two conditions are met. The switch 2 supplies a state 1 on output 3 (permanent operation or during the times T 1 of the cycle);

  the output of door 36 is in state 1.

  As for closing switch 20, one of the following three conditions should be satisfied

  presence of flame during a cycle T 1 of function-

ment;

  the switch 2 of the sequencer 1 provides on its output

  tie 3 a zero logic state (same as switch 8), outside the ignition sequence;

  the output of gate 36 is at zero (idem interrup-

8), in a safe state.

  At the two conditions for opening the switch 8

  a restriction is added for switch 20.

  The system must not have detected a flame, and

  the output 11 of the gate 55 must be in the zero state.

  Unlike the device which is the subject of the main patent application, energization by the double switch 2 does not force the rocker formed by the doors 36

  and 39 to determine the security status; on the contrary, the im-

  drive collected using elements 40 and 43 allows

  reset the flip-flop and the binary sequence counter

  heart. By moving switch 2 from the breakpoint

  to any of the sequential or permanent positions

  nentes, we automatically start with a T 1 cycle of

  mage The entry 44 of door 45 is controlled in state 1

  via output 3 of sequencer 1 When a flame is out

  sensed, the detection circuit (electrode 17) appears

  enter a zero logic state on input 18 The output of gate 45 changes to state 1; the output of door 36 also remains at 1 The solenoid valve 16 is supplied with current and controls the supply of gas to the burner The door which before the appearance of the flame was in state 1 goes to zero at the same time 45 goes to 1; the igniter

  14, thus, is no longer ordered and there is no longer any production.

tion of sparks.

  If the flame has not appeared, a logic level 1 is at the input 18 of the door 45 and the output goes to the zero state After a time of a few seconds, determined by the elements 37 and 46, the input 38 of door 39 goes to zero, as does the output of door 36 The valve closes and the lamp 10 indicates the safety state At the same time, the inputs of door 55 are zeroed by 45 and to a par 39, which imposes a zero on the output of door 55 and therefore the opening of switch 20 and the

  switching off the igniter 14 The ignition must be cut

  feeding the electronic system by double switching

2 to reset the circuit.

  If the flame disappears due to a cause

  outside during time T 1 of the cycle or in function

  permanent operation, as in the previous case, the output of gate 45 goes to zero, gate 55 will then go to state one and will control igniter 14 by the switch

  20 If this attempt to relight succeeds before the

  input 38 of gate 39 has reached zero state, input 18 of gate 45 again receives a zero logic level and its output reverts to state 1, which imposes the same

  state at input 38 of door 39 Valve 16 remains open

  green while door 55, having gone to zero state,

the igniter will no longer work -

  If, on the contrary, the re-ignition attempt has failed, the input 38 goes to the zero state at the end of the time determined by the resistor 46 and the capacitor 37: the output of the gate 39 goes to the one state, that from door 36 goes to

  the zero state, thus resulting in the safety state.

  During the time T 0, the input 44 of the gate 45 receives a zero level, the input 18 directly connected to the level one

  by a resistor will therefore put the output of gate 45 to one.

  The input 38 of the gate 39 is therefore in state one, the output of the gate 39 is therefore at zero and the output of the gate 36 is at a The logic level which is applied to

  input 44 of gate 45 is also transmitted to interrup-

  torers 8 and 20 using the diode 49 These are therefore open and there is no gas circulation or production of sparks; when T O ends, it follows a time

  T 1 with the operation described above.

  If the safety state was caused by the unscheduled disappearance of the flame, the output of door 36 has gone to zero state, which means that its two inputs are in state one. To reset the device, it suffices to temporarily switch the input 12 of the door 36 to the zero state and this by acting on the switch which by cutting then restoring the supply of the circuit will allow the elements 43 and 40 to generate a negative pulse forcing the scale constituted by doors 39 and 36 to

change state.

  It should also be noted that the igniter 14 which can be provided for several ignition points, other

  only for the sequential burner, can be activated manually-

by means of pusher 19.

  As is obvious, and as already follows from the foregoing, the invention is in no way limited to those of its modes of application and embodiments which have been more particularly envisaged. On the contrary, it embraces all of them. variants By way of example, we have given in FIG. 6 an example of safety logic

wired in NOR doors.

Claims (4)

  1 sequencer flame control device, for   burners, for automatic and cyclic control   that, via an appropriate igniter, pre-   sence and absence of a flame according to an adjustable duty cycle, the user being able to determine by a command the ratio between the duration T 1 of the presence of the flame and the total duration T or period of the cycle, characterized in that it comprises: a sequencer essentially consisting of electronic circuits able to supply control pulses   whose cyclic ratio T 1 / T can be determined by the ac-   user on a multi-position switch   tions; a logical security system, receiving in particular,   as input signals, the output signal of said sequence   heart and a signal from a flame detection electrode associated with the burner concerned, this latter signal   being representative of the presence or absence of flam- me; and   two switch circuits interposed between the source   of power and, on the one hand, the igniter associated with the burner   their, and on the other hand a solenoid valve or the like, for controlling the supply of fuel to the burner, these circuits   switches receiving essentially, as signal of   control input, the output signal from said safety assembly. 2 Device according to claim 1, characterized in that it is arranged so that the arrival of fuel to the burner is prohibited if the ignition of the flame has not been achieved after a predetermined time, possibly   after an attempt to relight.   3 Device according to claim 1 or 2, character-   in that it is further arranged for obtaining an immediate automatic re-ignition command in case the   flame would be extinguished by an external cause   higher than the wind, while the solenoid valve controls   again the arrival of fuel at the burner.   4 Device according to any one of claims   above, characterized in that said sequencer is as-   associated with a reset circuit controlled when said   multi-position switch, user operated   tor, determines that the fuel arrives at the burner.   Device according to any one of the claims   above, characterized in that said sequencer is as-   associated with an igniter able by an auxiliary control operate independently.   6 Device according to any one of claims   previous, characterized in that the detection electrode   associated with this sequencer can also be used to pro-   duction of sparks on the sequential burner.