EP0439417B1 - Sicherheitsvorrichtung für einen Brennerbetrieb - Google Patents

Sicherheitsvorrichtung für einen Brennerbetrieb Download PDF

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Publication number
EP0439417B1
EP0439417B1 EP91420025A EP91420025A EP0439417B1 EP 0439417 B1 EP0439417 B1 EP 0439417B1 EP 91420025 A EP91420025 A EP 91420025A EP 91420025 A EP91420025 A EP 91420025A EP 0439417 B1 EP0439417 B1 EP 0439417B1
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EP
European Patent Office
Prior art keywords
capacitor
circuit
burner
thermocouple
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91420025A
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English (en)
French (fr)
Other versions
EP0439417A1 (de
Inventor
François Danjou
Gilles Boiron
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Constructions Electriques R V SA
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Constructions Electriques R V SA
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Application filed by Constructions Electriques R V SA filed Critical Constructions Electriques R V SA
Publication of EP0439417A1 publication Critical patent/EP0439417A1/de
Application granted granted Critical
Publication of EP0439417B1 publication Critical patent/EP0439417B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/102—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/22—Timing network
    • F23N2223/26—Timing network with capacitors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/14—Controlling burners with gasification or vaporizer elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00—Fuels
    • F23N2239/04—Gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/08—Household apparatus

Definitions

  • the present invention relates to the technical means used to control the supply of gaseous fuel to a burner in the general sense, of a domestic or industrial character and capable of equipping all the devices or installations for which they constitute a source of production. heat.
  • the invention relates, more specifically, to devices adapted to assume a safety function when the burner is lit, on the one hand, and when the burner is turned off, on the other hand.
  • thermocouple rises in the presence of a flame, so that the thermocouple produces an excitation current from a coil adapted to maintain the solenoid valve in the open position. . If no flame appears, the supply solenoid valve is closed at the end of the ignition time, insofar as the thermocouple produces no holding current of the coil.
  • thermocouple despite the absence of flame, can continue to ensure the opening of the solenoid valve, for the time necessary for its cooling.
  • Such a drawback of the operation of the safety device appears, in particular, during a hot start of the burner beyond the ignition delay and at each stop of operation of the burner.
  • the present invention therefore aims to remedy the drawbacks stated above by proposing a safety device capable of ensuring, in complete safety, the operation of the solenoid valve at each start-up, while making it possible to block the action of the thermocouple as soon as a burner operation stop occurs.
  • the invention also aims to provide a device suitable for ensuring an effective safety function of the operation of the burner, whatever the fault occurring on a component of the device according to the invention.
  • the invention also aims to offer a safety device that is simple to use and has a reduced manufacturing cost.
  • the switching means comprise a relay mounted in series with the capacitor, by means of a diode mounted to prevent excitation of the relay during charging of the capacitor and to authorize excitation of the relay during discharging the capacitor
  • the device comprises a relay supplied by the circuit and the two contacts of which are mounted on the terminals of a thermocouple, so as to close the thermocouple circuit as soon as an ignition order intervenes and to inhibit operation of the thermocouple as soon as a burner shutdown order occurs.
  • Fig. 1 illustrates an example of application of the security device according to the invention.
  • Fig. 2 illustrates an alternative embodiment of a safety device according to the invention ensuring an ignition delay.
  • Fig. 3 is a voltage curve as a function of time, making it possible to explain the operation of the device according to the invention.
  • Fig. 4 illustrates another alternative embodiment of the security device according to the invention.
  • Fig. 1 illustrates, by way of example, an installation comprising a safety system 1 for the operation of a burner 2 , constituting, in the example illustrated, a burner of an oven.
  • the burner 2 is capable of being supplied with gaseous fuel via a line 3 on which is mounted a solenoid valve 4 which is controlled by the system 1 .
  • the solenoid valve 4 represented schematically, comprises, in a conventional manner, a shutter 5 intended to be moved from its seat 6 , by means of a rod 7 associated with an excitation coil 8 , making it possible to supply the burner with fuel.
  • the shutter 5 is associated with an excitation coil 9 , adapted to maintain the shutter 5 in the open position.
  • This coil 9 is controlled, by means of a means 11 for detecting the presence of a flame, advantageously formed by a thermocouple generating an excitation current of the coil when the temperature of the thermocouple has risen to a given temperature.
  • the burner 2 is provided, in a conventional manner, with an ignition electrode 12 making it possible to ignite the fuel using high-voltage sparks generated and controlled by a suitable means which is integrated, in the example illustrated, in security system 1 .
  • the safety system 1 which comprises a circuit 1 a suitable for controlling the solenoid valve 4 and the ignition electrode 12 , comprises, in accordance with the invention, a timed control system 1 b adapted for allow, following a command signal from the burner operation, the opening of the solenoid valve during a determined ignition time Ta , for example of the order of fifteen seconds.
  • the timed control system 1b comprises a circuit 14 for producing a low-voltage DC power supply, from a supply network.
  • the supply network is of the single-phase type and delivers an alternating voltage of the order of 220 volts, through a phase line L1 and a neutral line L2 .
  • the phase line L1 is provided with a contact 16 of a thermostat which makes it possible to give the order ensuring the operation control of the burner.
  • Line L1 also comprises, between contact 16 and circuit 14 , an assembly formed by a capacitor 17 connected in series with a resistor 18 .
  • the circuit 14 which constitutes a rectifier, delivers, in the example illustrated, a voltage corresponding to the half-waves positive of the supply voltage produced by the network.
  • the circuit 14 is formed by a first diode 19 , the anode of which is connected to the capacitor 17 and to the cathode of a second diode 21 .
  • the cathode of the diode 19 is connected, via a capacitor 22 , to the neutral.
  • a relay 48 is mounted between the anode of the diode 21 and the common point between the neutral and the capacitor 22 .
  • the relay 48 which is connected in parallel with a capacitor 49 , comprises two associated contacts 48 a , 48 b mounted in the circuit of the thermocouple 11 , in parallel with one another.
  • One of the terminals of the thermocouple 11 is connected, via the coil 9 , to a common point of the two contacts, while the other terminal of the thermocouple is connected to the other common point of the contacts.
  • the circuit 14 is intended to supply or charge, through a resistor 24 connected to the cathode of the diode 19 , a capacitor 25 which is connected to the neutral using a diode 26 mounted in its direct direction.
  • the capacitor 25 is associated with a circuit 27 ensuring, when the charging voltage of the capacitor 25 reaches a threshold voltage fixed by the circuit 27 , the discharge of the capacitor 25 to a given value, so that the discharge time of the capacitor corresponds to the ignition duration Ta .
  • Such a discharge circuit controlled at threshold voltage 27 comprises a flip-flop 28 mounted in parallel on the capacitor 25 and a threshold-voltage means 29 ensuring the triggering of the flip-flop when the charge voltage of the capacitor 25 reaches the fixed threshold voltage by means 29 which is constituted, in the example illustrated, by a Zener diode.
  • the flip-flop 28 consists of a first 31 and a second 32 direct-coupled transistors.
  • the emitter of the first transistor 31 is connected, via a resistor 33 , to the common point between the resistor 24 and the capacitor 25 .
  • the collector of transistor 31 drives the base of the second transistor 32 which comprises, between its base and its emitter, an assembly formed by a capacitor 35 mounted in parallel with a resistor 36 .
  • the emitter of transistor 32 which is connected to neutral, is connected to the anode of Zener diode 29 , while the collector of transistor 32 drives the base of transistor 31 and is connected, on the one hand, to the cathode of Zener diode 29 and, on the other hand, via a resistor 37 , at the point in common between the capacitor 22 , the diode 19 and the resistor 24 .
  • the discharge circuit 27 described above discharges the capacitor 25 making it possible to control switching means which ensure the opening of the solenoid valve.
  • the switching means are constituted by a relay 41 mounted in series with a diode 42 preventing the excitation of the relay during the charging of the capacitor 25 and authorizing the excitation of the relay during the discharge of the capacitor.
  • the cathode of the diode 42 is connected to the common point, between the capacitor 25 and the anode of the diode 26 , while the relay 41 is connected to the cathode of the diode 26 which is connected to neutral.
  • the contact 41 a associated with the relay 41 , is mounted between the contact 16 and the circuit 1 a for controlling the solenoid valve 4 .
  • the contact 16 closes, making it possible to supply the circuit 14 for producing a low-voltage supply and activating a solenoid valve 45 mounted on the fuel line upstream of the solenoid valve 4 and whose function will appear more clearly in the following description.
  • the charging current supplied by the low voltage positive power supply, flows through the resistor 24 , the capacitor 25 and the diode 26 .
  • the capacitor 25 therefore charges, as illustrated by part C of the curve in FIG. 3. No current flows in the discharge circuit 27 , as long as the voltage drawn by the resistor 37 remains below the threshold voltage of the Zener diode, for example, of the order of 40 volts.
  • a negative voltage therefore appears on the negative armature of the capacitor 25 , so that the diode 42 is polarized in the passing direction, making it possible to ensure the circulation of a discharge current through a mesh formed by the resistor 33 , the transistors 32 , 31 , the coil 41 , the diode 42 and the capacitor 25 .
  • the excitation of the coil 41 causes the passage of the associated contact 41 a , from its rest position to that of work for which the coil 8 of the solenoid valve 4 is excited so as to ensure the opening of the solenoid valve.
  • the flow of current in the mesh thus formed decreases, exponentially, with a determined time constant, so that the discharge voltage corresponds to the shape of the portion D of the curve of FIG. 3 .
  • the excitation time of the relay 41 which is easily adjustable and determined, in relation to the time constant of the discharge of the capacitor, is chosen to correspond to the ignition time Ta of the burner.
  • the safety device therefore allows the opening of the solenoid valve 4 for a determined ignition time and in complete safety, each time the burner is lit, insofar as if a component of the device is defective, the charge of the capacitor 25 can in no case intervene and authorize the opening of the solenoid valve.
  • the safety device according to the invention is capable of providing an additional function which is that of blocking the action of the thermocouple, as soon as an operation stop of the burner occurs.
  • This final discharge value corresponds to a state of equilibrium which is reached when the voltage across the terminals of capacitor 25 becomes equal to the voltage determined by the divider bridge formed by resistors 24 and 33 on the low voltage supply voltage. This voltage is maintained, except for leaks, until the appearance of an order to extinguish the burner.
  • This extinction order which is manifested by the opening of the contact 16 , causes rapid de-energization of the relay 48 , so that the contacts 48 a , 48 b switch to open the thermocouple circuit 11 and ensure the de-energization of the coil 9 to close the solenoid valve 4 .
  • thermocouple makes it possible to block the action of the thermocouple as soon as a burner operation stops, while ensuring that the solenoid valve operates each time the burner is started.
  • Direct blocking of the thermocouple allows the removal of the upstream solenoid valve necessary to shut off the fuel supply as soon as a burner shutdown order occurs.
  • the security device according to the invention makes it possible to ensure two essential security functions by implementing technical means at a reduced cost.
  • the embodiments described are given by way of example.
  • the operation given above remains identical in the case where the low voltage supply voltage is negative.
  • the mounting of the polarized components should be reversed.
  • Fig. 4 illustrates another alternative embodiment making it possible to inhibit the action of the thermocouple as soon as a burner operation stop occurs.
  • the associated contacts 48 a , 48 b are mounted on either side of the capacitor 25 , making it possible to connect the capacitor 25 , either to the circuit 14 for producing a low voltage supply, or to the terminals of the thermocouple circuit.
  • one of the terminals of the thermocouple 11 is connected to the contact 48 b , while the other terminal of the thermocouple 11 is connected, via a resistor 51 , to the contact 48 a .
  • the coil 9 is connected to the two terminals of the thermocouple 11 .
  • relay 48 is energized, so that contacts 48 a , 48 b pass from the position of connection with the thermocouple 11 to that of connection with the circuit 14 , which ensures the charge of the capacitor 25 as explained above.
  • the relay 48 is de-energized, so that the contacts 48 a , 48 b switch to connect the plates of the capacitor 25 to the terminals of the thermocouple 11 , as illustrated in FIG . 4 .
  • the capacitor 25 discharges in the thermocouple 11 and in the resistor 51 connected in series in the thermocouple circuit, to control the discharge current in the thermocouple circuit.
  • Such a discharge produces a circulation of a current opposite to that generated by the rise in temperature, making it possible to ensure the cancellation of the current circulating in the thermocouple 11 and, consequently, in the coil 9 , in order to obtain its de-excitation and the closing of the solenoid valve 4 .
  • an embodiment of the rocker 28 appears.
  • the resistor 33 which is connected to the cathode of the Zener diode 29 , attacks the anode of a thyristor 52 whose cathode is connected to the common point between the resistor 31 , the capacitor 35 and the neutral.
  • the gate of the thyristor 52 is connected to the common point between the capacitor 35 , the resistor 31 and the anode of the Zener diode 29 .
  • the thyristor 52 is triggered when the charging voltage of the capacitor 25 reaches the threshold voltage of the Zener diode 29 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)

Claims (7)

  1. Sicherheitsvorrichtung für den Betrieb eines Brenners (2) für gasförmigen Brennstoff mit einem zeitverzögerten Regelsystem mit:
    - einer Schaltung (14) zur Erzeugung einer niedrigen Gleichspannung,
    - einem beim Auftreten eines Regelbefehls durch die Schaltung (14) zu speisenden Kondensator (25),
    - und einer Schaltung (27) zur Entladung des Kondensators (25) über eine Einrichtung (29), wenn die Ladespannung des Kondensators (25) eine festgelegte Schwellenspannung (Va) erreicht, derart, daß die Entladungszeit wenigstens der Brenndauer (Ta) des Brenners entspricht, wobei die Entladung des Kondensators die Steuerung von Schalteinrichtungen (41, 41a) ermöglicht, die die Öffnung eines Elektroventils (4) sicherstellen, das die Brennstoffversorgung des Brenners ermöglicht,
    dadurch gekennzeichnet, daß
    die Schalteinrichtungen ein erstes Relais (41) umfassen, das mit dem Kondensator (25) über eine Diode (42) in Reihe geschaltet ist, die montiert ist, um die Erregung des Relais während der Aufladung des Kondensators auszuschließen und die Erregung des Relais während der Entladung des Kondensators zuzulassen, daß die Vorrichtung ein von der Schaltung (14) zur Erzeugung einer niedrigen Gleichspannung gespeistes zweites Relais (48) umfaßt, dessen zwei Kontakte (48a, 48b) an den Anschlüssen eines Thermoelements (11) so montiert sind, daß die Thermoelementschaltung geschlossen wird, sobald ein Zündbefehl wirksam wird und der Betrieb des Thermoelements unterbunden wird, sobald ein Brennerlöschbefehl wirksam wird.
  2. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die zwei gesteuerten Kontakte (48a, 48b) in der Thermoelementschaltung zueinander parallel geschaltet sind und die Öffnung der Thermoelementschaltung sicherstellen, wenn ein Löschbefehl ausgesandt wird.
  3. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die zwei gesteuerten Kontakte (48a, 48b) jeweils mit einem der Beläge des Kondensators (25) verbunden sind und es ermöglichen, den Kondensator (25) entweder mit der Schaltung zur Erzeugung einer niedrigen Gleichspannung (14) zu verbinden, wenn ein Brennerbetriebsbefehl auftritt, oder mit den Thermoelementanschlüssen zu verbinden, wenn ein Brennerlöschbefehl wirsam wird, um in das Thermoelement einen Strom einzugeben, der ausreicht, um den zirkulierenden aufzuheben, um so das sofortige Schließen des Elektroventils (4) sicherzustellen.
  4. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    der Kondensator (25) in Reihe eine Diode (26) aufweist, die parallel zur Diode (42) und dem Relais (41) angeordnet ist und die Aufladung des Kondensators durch die Schaltung zur Erzeugung einer niedrigen Gleichspannung (14) ermöglicht.
  5. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Entladungsschaltung (27) eine parallel zum Kondensator (25) montierte Kippstufe (28) umfaßt und aus einem ersten (31) und einem zweiten Transistor (32) besteht, die einander komplementär und direkt gekoppelt sind, wobei der erste Transistor (31) einerseits durch seinen Emitter und über einen Widerstand (33) mit einem der Beläge des Kondensators (25) und andererseits durch seinen Kollektor mit der Basis des zweiten Transistors (31) und einer Anordnung verbunden ist, die aus einem parallel zu einem Widerstand (32) montierten Kondensator (35) gebildet ist, wohingegen der zweite Transistor (31) einerseits durch seinen Kollektor mit der Basis des ersten Transistors und der Kathode einer Zenerdiode (29) verbunden ist, die die Schwellenspannungsauslösevorrichtung bildet, und andererseits durch seinen Emitter mit der Anode der Zenerdiode (29) und der Widerstands(32)-Kondensator(35)-Anordnung verbunden ist.
  6. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Entladungsschaltung (27) eine Kippstufe (28) aufweist, die aus einem Thyristor (52) besteht, dessen Gate durch die Schwellenspannungseinrichtung (29) gesteuert wird.
  7. Sicherrungsvorrichtung nach den Ansprüchen 1, 5 und 6,
    dadurch gekennzeichnet, daß
    die Entladungsschaltung (27) eingerichtet ist, um die Entladung des Kondensators bis zu einem gegebenen Wert (VD) sicherzustellen, der gleich oder kleiner als die Entregungsspannung (Vr) des Relais (41) der Schalteinrichtungen ist.
EP91420025A 1990-01-26 1991-01-28 Sicherheitsvorrichtung für einen Brennerbetrieb Expired - Lifetime EP0439417B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9001167 1990-01-26
FR9001167A FR2657684B1 (fr) 1990-01-26 1990-01-26 Dispositif de securite pour le fonctionnement d'un bruleur.

Publications (2)

Publication Number Publication Date
EP0439417A1 EP0439417A1 (de) 1991-07-31
EP0439417B1 true EP0439417B1 (de) 1994-01-19

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Family Applications (1)

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EP91420025A Expired - Lifetime EP0439417B1 (de) 1990-01-26 1991-01-28 Sicherheitsvorrichtung für einen Brennerbetrieb

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EP (1) EP0439417B1 (de)
FR (1) FR2657684B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9021214D0 (en) * 1990-09-28 1990-11-14 Black Automatic Controls Limit Control circuit
EP0837283B1 (de) 1996-10-16 1999-12-22 Sit la Precisa S.p.a. Selbsttätiges Regelsystem mit doppeltem Sicherheitsschutz für einen intermittierend funktionierenden Gasbrenner
ES2238905B1 (es) * 2003-07-09 2006-12-01 Orkli, S. Coop. "circuito de alimentacion de una valvula de seguridad para el encendido de un quemador de gas".
ES2311185T3 (es) * 2005-06-30 2009-02-01 Orkli, S. Coop. Quemador de gas con un circuito de alimentacion de una valvula de seguridad para el encendido de dicho quemador de gas.
CN103244973A (zh) * 2013-05-08 2013-08-14 刘敏 一种新型燃气灶开关电子定时器及其定时熄火方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3720858A (en) * 1971-07-20 1973-03-13 Columbia Gas Syst Service Corp Relay timing system
FR2560357B1 (fr) * 1984-02-27 1989-04-28 Vano Sa Prod Installation de commande du bruleur a gaz d'un appareil et appareil pourvu d'une telle installation
JPS60147055A (ja) * 1984-03-16 1985-08-02 Rinnai Corp 湯沸器の押釦式操作装置
JPS61125521A (ja) * 1984-11-21 1986-06-13 Rinnai Corp 燃焼器の制御装置
GB8620960D0 (en) * 1986-08-29 1986-10-08 Baxi Partnership Ltd Control circuit

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Publication number Publication date
EP0439417A1 (de) 1991-07-31
FR2657684A1 (fr) 1991-08-02
FR2657684B1 (fr) 1995-07-21

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