EP0698767B1 - Circuit de commande d'un brûleur à gaz avec contrÔle de l'alimentation d'air comburant - Google Patents

Circuit de commande d'un brûleur à gaz avec contrÔle de l'alimentation d'air comburant Download PDF

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Publication number
EP0698767B1
EP0698767B1 EP94113184A EP94113184A EP0698767B1 EP 0698767 B1 EP0698767 B1 EP 0698767B1 EP 94113184 A EP94113184 A EP 94113184A EP 94113184 A EP94113184 A EP 94113184A EP 0698767 B1 EP0698767 B1 EP 0698767B1
Authority
EP
European Patent Office
Prior art keywords
relay
control circuit
contact
resistor
series
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
EP94113184A
Other languages
German (de)
English (en)
Other versions
EP0698767A1 (fr
Inventor
Derk Vegter
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.)
Honeywell BV
Original Assignee
Honeywell BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honeywell BV filed Critical Honeywell BV
Priority to EP94113184A priority Critical patent/EP0698767B1/fr
Priority to DE59400955T priority patent/DE59400955D1/de
Publication of EP0698767A1 publication Critical patent/EP0698767A1/fr
Application granted granted Critical
Publication of EP0698767B1 publication Critical patent/EP0698767B1/fr
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 program acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time program 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
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements 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
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • F23N2005/182—Air flow switch
    • 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
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/22—Timing network
    • F23N2223/28—Timing network with more than one timing element
    • 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
    • F23N2229/00—Flame sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel

Definitions

  • the invention relates to a control circuit for gas burners according to the preamble of claim 1.
  • the gas burner has a pilot burner, a combustion air blower and a flow switch for monitoring the combustion air supply in order to ensure that the flow switch works properly
  • the excitation winding of a pilot burner valve is connected in series with a diode and the normally closed contact of the flow switch to an alternating current source and this series circuit is connected in parallel with a further series circuit consisting of a charging capacitor and a resistor.
  • the normally open contact of the flow switch is connected in series with the field winding. After the charging capacitor has been sufficiently charged, it provides the current for energizing a relay, the normally open contact of which switches the blower on.
  • the present invention achieves a substantial improvement over EP-A 0 566 768 in that the charging time of the charging capacitor is shortened and thus the gas supply is switched on more quickly without impairing the automatic function check of the flow switch.
  • the impedance of a fan is usually in the order of 50-100 ⁇ , while the excitation winding of a valve has a resistance of 2 k ⁇ or more.
  • the fact that it is not the excitation winding, as in EP-A 0 566 768, but the low-resistance fan that keeps the negative half-wave of the AC voltage away from the charging capacitor, means that the capacitor charges up more quickly and supplies the threshold voltage required for switching the control electronics more quickly.
  • the circuit can also be used for gas burners with a constantly burning pilot burner.
  • a combustion air blower FA and an electromagnetically actuated ignition gas valve PV and a flow switch PS in the supply air duct are assigned to the gas burner (not shown in detail).
  • An AC voltage for example the AC mains voltage, is supplied to the circuit arrangement via the connection terminals L and N.
  • the flow switch PS is provided with a changeover contact PC, which is present at the normally closed contact PNC when there is no combustion air flow and at the PNO work contact when the combustion air flow is correct.
  • a relay RY02 the changeover contact C2 of which is applied to the normally closed contact NC2 when the relay is de-energized and to the NO2 contact when the relay is energized.
  • the combustion air blower FA is connected via the normally closed contact PNC of the flow switch PS as well as the diode D04 and a resistor R01 to the normally closed contact NC2 and thus to the AC line L.
  • the series circuit of blower FA, flow switch break contact PNC and diode D04 is connected in parallel to a series circuit which comprises a resistor R05 and a charging capacitor C05.
  • a series circuit consisting of the relay RY02 and an electronic switch Q02 is connected in parallel to this charging capacitor.
  • the control electrode of the electronic switch Q02 is connected to the output A of control electronics CE (not shown in detail), which supplies a signal at that output A which is dependent on the state of charge of the charging capacitor C05.
  • connection point of resistor R05 and charging capacitor C05 can, for example, have a structure similar to that in EP-A 0 566 768 connected to the circuit arrangement connected to the components provided with the same reference numerals.
  • the present invention can also be used in an ignition and safety circuit for gas burners, as described in EP-A 0 440 872.
  • the AC voltage terminal L can be connected via the normally open contact NO2 of the relay RY2 on the one hand to the blower FA and on the other hand to the changeover contact PC of the flow switch PS.
  • the connection of the relay RY2 facing the input E of the control electronics CE is also connected to the normally open contact NO2 of the relay via a second resistor R02 and a second diode D01.
  • the impedance of the fan FA is considerably lower than the impedance of the series circuit consisting of the resistors R01 and R05.
  • the resistor R01 is connected from the connection point U1 of the diode D04 with the resistor R05 to the normally closed contact NC2 of the relay RY2.
  • the circuit arrangement shown in the drawing in the idle state works as follows: When the line L is connected to the mains AC voltage, the capacitor C05 is charged by the positive half-wave of the AC voltage via the resistors R01 and R05.
  • the flow switch PS is initially properly in its rest position, i.e. If its PC contact is at the normally closed contact PNC, the capacitor is not discharged during the negative half-wave of the sine voltage, because the voltage at the series connection of the capacitor C05 with the resistor R05 via the diode D04, the normally closed contact PNC and the low-resistance fan FA are practically short-circuited is.
  • the control electronics CE delivers a switch-on signal for the transistor Q2 at the output A.
  • Capacitor C05 can discharge through relay RY2 and transistor Q02 and cause the relay to respond. Its contact C2 now switches to make contact NO2 and thus establishes a holding circuit for relay RY2, which is connected from terminal L via make contact C2 / NO2, diode D01, resistor R02, relay RY2 and transistor Q02 to ground N. leads.
  • the contact C2 is switched over, the fan FA receives current and begins to supply combustion air.
  • the flow switch PS switches over, see above that now his changeover contact PC is connected to the make contact PNO and the gas valve PV is energized. This opens the valve and the escaping gas can ignite at any ignition device.

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

Claims (5)

  1. Circuit de commande pour brûleur à gaz comportant une vanne d'envoi de gaz, un ventilateur délivrant l'air de combustion ainsi qu'un commutateur d'écoulement pour contrôler l'arrivée d'air, caractérisé en ce que
    a) le ventilateur (FA) délivrant l'air de combustion forme un premier circuit série, en étant raccordé en série avec une première diode (D04) et le contact de repos (PNC) du commutateur d'écoulement (PS);
    b) un second circuit série constitué par un condensateur de charge (C05) et une première résistance (R05) est branché en parallèle sur ce premier circuit série;
    c) ces deux circuits série (FA,D04,PNC;C05,R05) sont connectés à une source de tension alternative (L,N) par l'intermédiaire du contact de repos (NC2) d'un relais (RY02); et
    d) l'enroulement d'excitation du relais (RY02) est commandé par une tension qui dépend de l'état de charge du condensateur de charge.
  2. Circuit de commande selon la revendication 1, caractérisé en ce que
    a) l'enroulement d'excitation du relais (RY02), en série avec un interrupteur électronique (Q02), est branché en parallèle sur le condensateur de charge (C05), et
    b) un signal, qui dépend de l'état de charge du condensateur de charge (C05), est envoyé à l'électrode de commande de l'interrupteur électronique (Q02).
  3. Circuit de commande selon la revendication 2, caractérisé en ce que
    a) l'une des bornes de tension alternative (L) est raccordée, par l'intermédiaire du contact de travail (N02) du relais (RY02), d'une part au ventilateur (FA) et d'autre part au contact de commutation (PC) du commutateur d'écoulement (PS), et
    b) le contact de travail (PN0) du commutateur d'écoulement (PS) est relié à l'enroulement d'excitation de la vanne d'envoi de gaz (PV).
  4. Circuit de commande selon la revendication 2 ou 3, caractérisé en ce que le point de jonction (U1) de la première diode (D04) et de la première résistance (R05) est connecté, par l'intermédiaire d'une seconde résistance (R01), au contact de repos (NC2) du relais (RY02).
  5. Circuit de commande selon la revendication 2, 3 ou 4, caractérisé en ce que l'enroulement d'excitation du relais (RY02) est connecté au contact de travail (N02) du relais, par l'intermédiaire d'une troisième résistance (R02) et d'une seconde diode (D01).
EP94113184A 1994-08-24 1994-08-24 Circuit de commande d'un brûleur à gaz avec contrÔle de l'alimentation d'air comburant Expired - Lifetime EP0698767B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP94113184A EP0698767B1 (fr) 1994-08-24 1994-08-24 Circuit de commande d'un brûleur à gaz avec contrÔle de l'alimentation d'air comburant
DE59400955T DE59400955D1 (de) 1994-08-24 1994-08-24 Gasbrenner-Steuerschaltung mit Überwachung der Verbrennungsluftzufuhr

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94113184A EP0698767B1 (fr) 1994-08-24 1994-08-24 Circuit de commande d'un brûleur à gaz avec contrÔle de l'alimentation d'air comburant

Publications (2)

Publication Number Publication Date
EP0698767A1 EP0698767A1 (fr) 1996-02-28
EP0698767B1 true EP0698767B1 (fr) 1996-10-30

Family

ID=8216227

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94113184A Expired - Lifetime EP0698767B1 (fr) 1994-08-24 1994-08-24 Circuit de commande d'un brûleur à gaz avec contrÔle de l'alimentation d'air comburant

Country Status (2)

Country Link
EP (1) EP0698767B1 (fr)
DE (1) DE59400955D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0855557A1 (fr) 1997-01-22 1998-07-29 Honeywell B.V. Circuit de commande d'une soupape à gaz avec contrÔle de l'alimentation d'air comburant
EP1126219A1 (fr) 2000-02-11 2001-08-22 Honeywell B.V. Circuit de commande
EP1182402A1 (fr) 2000-08-25 2002-02-27 Honeywell B.V. Circuit de commande
EP1195558A1 (fr) 2000-10-06 2002-04-10 Honeywell B.V. Circuit de commande

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59102338D1 (de) * 1990-10-10 1994-09-01 Honeywell Bv Luftstromüberwachungseinrichtung für Brenneranlagen.
DE59203393D1 (de) * 1992-04-24 1995-09-28 Honeywell Bv Steuerschaltung für Gasbrenner mit einem Strömungsschalter zur Überwachung der Luftzufuhr.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0855557A1 (fr) 1997-01-22 1998-07-29 Honeywell B.V. Circuit de commande d'une soupape à gaz avec contrÔle de l'alimentation d'air comburant
EP1126219A1 (fr) 2000-02-11 2001-08-22 Honeywell B.V. Circuit de commande
EP1182402A1 (fr) 2000-08-25 2002-02-27 Honeywell B.V. Circuit de commande
EP1195558A1 (fr) 2000-10-06 2002-04-10 Honeywell B.V. Circuit de commande

Also Published As

Publication number Publication date
EP0698767A1 (fr) 1996-02-28
DE59400955D1 (de) 1996-12-05

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