EP0478359A2 - Regeleinrichtung - Google Patents

Regeleinrichtung Download PDF

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Publication number
EP0478359A2
EP0478359A2 EP91308843A EP91308843A EP0478359A2 EP 0478359 A2 EP0478359 A2 EP 0478359A2 EP 91308843 A EP91308843 A EP 91308843A EP 91308843 A EP91308843 A EP 91308843A EP 0478359 A2 EP0478359 A2 EP 0478359A2
Authority
EP
European Patent Office
Prior art keywords
control device
solenoid valve
control
charge storage
circuit
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.)
Withdrawn
Application number
EP91308843A
Other languages
English (en)
French (fr)
Other versions
EP0478359A3 (en
Inventor
John W. Defries
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.)
Black Automatic Controls Ltd
Original Assignee
Black Automatic Controls Ltd
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 Black Automatic Controls Ltd filed Critical Black Automatic Controls Ltd
Publication of EP0478359A2 publication Critical patent/EP0478359A2/de
Publication of EP0478359A3 publication Critical patent/EP0478359A3/en
Withdrawn legal-status Critical Current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
    • F23N5/24—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
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/22—Timing network
    • 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

Definitions

  • This invention relates to control devices.
  • the invention has particular, although not exclusive, relevance to safety devices including a fail-safe control circuit for controlling the length of time that a gas or oil valve is open during the ignition cycle of a gas appliance.
  • the devices using a capacitor to store a limited amount of charge, which is used to operate a relay.
  • This relay is arranged to operate the gas or oil valve.
  • the components are designed to be fail-safe, i.e. short circuit or open circuit faults in any of the components are designed to either cause the relay not to operate, or to operate for a shorter time than would normally be the case.
  • One component which it is not possible to make fail-safe however, is the relay itself.
  • the relay will fail-safe in the event that the relay coil becomes either short circuit or open circuit, it will not fail-safe if the relay contacts become welded together due to, for example, an overcurrent in the circuit.
  • relay armature is a mechanical device, this may become misplaced causing failure of the relay. It is also possible for the relay to suffer from magnetic remanence, such that the relay will stay temporarily, or permanently, closed after being magnetised by current passing through the relay coil.
  • a control device including a control circuit incorporating a charge storage device, means for charging the charge storage device, and means for subsequently discharging the charge storage device, the device being characterised in that it includes a solenoid valve, charge from the charge storage device being arranged to operate the solenoid valve so as to control a device to be controlled by the circuit.
  • control circuit can only fail in a fail-safe manner.
  • the circuit is packaged as part of the solenoid valve assembly. This ensures that unauthorised tampering can be avoided, and that unsafe installation due to faulty wiring between the electronics and the control valve can be eliminated.
  • the control device is designed to open a gas valve (not shown) for a limited period of time in response to the switching of a switch, or to open the gas valve for an indefinite period on the detection of a flame by a flame probe not shown in the Figure but as described, for example, in our pending U.K. Patent Application GB 2230632A.
  • the detection of a flame by the flame probe is operative to cause a switch 1 within the control circuit incorporated in the control device to close.
  • the switch 1 is connected via a current limiting resistor 3 to a circuit arrangement comprising the coil 5 of a solenoid shut-off valve, the coil 5 being arranged in series between a diode 7 and a zener diode 9.
  • a storage capacitor 11 is connected between the node between the coil 5 and the zener diode 9, and a further node between a resistor 13 and an electronic switch 15.
  • the storage capacitor 11 is charged via the resistor 13.
  • the switch 15 is closed. Initially the capacitor 11 is discharged via the zener diode 9 to a voltage determined by the breakdown voltage of the zener diode 9.
  • the storage capacitor 11 continues to discharge via the coil 5 and the diode 7.
  • the solenoid valve (not shown in Figure 1) operated by the coil 5 will open until the current supplied by the storage capacitor 11 falls below the hold on current for the solenoid valve. If, however, the flame probe detects that a flame is present the switch 1 will be caused to close, and hold on current will be supplied to the coil 5 via the resistor 3 and the zener diode 9 so as to cause the solenoid valve to remain open.
  • the value of the resistor 3 will be chosen to limit the current supplied to the coil 5 via the resistor 3 and the zener diode 9 to the hold on value only of the solenoid valve, and will not be sufficient to operate the solenoid valve. Thus the gas valve will be prevented from ever opening due to a fault in the flame probe circuit. It will be appreciated that solenoid valves have a characteristic in which there is a large difference between the current required to open the solenoid valve and the hold on current required to keep the solenoid valve open, thus enabling a large value of the resistor 3 to be chosen. Other interlocks (not shown) may be provided to prevent the switch 15 closing if switch 1 is closed by the presence of a flame or the simulation of a flame.
  • circuitry shown in Figure 1 may be packaged as part of the solenoid valve assembly, thus giving a particularly compact and convenient control device.
  • a control device is particularly safe as unauthorised tampering with the control circuit is prevented.
  • the control device is provided as a single plug in unit, the possibility of a consumer providing faulty wiring between the circuitry and the control valve can be eliminated.
  • the assembly will typically include one, or as shown in the figures, two solenoid valves with the associated control circuits and solenoid coils 5 being enclosed in a plastics case 17, with the actuators 19 of the solenoid valves projecting from the case so as to enable them to be attached to the gas valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
EP19910308843 1990-09-28 1991-09-27 Control device Withdrawn EP0478359A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909021214A GB9021214D0 (en) 1990-09-28 1990-09-28 Control circuit
GB9021214 1990-09-28

Publications (2)

Publication Number Publication Date
EP0478359A2 true EP0478359A2 (de) 1992-04-01
EP0478359A3 EP0478359A3 (en) 1992-08-05

Family

ID=10682964

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910308843 Withdrawn EP0478359A3 (en) 1990-09-28 1991-09-27 Control device

Country Status (2)

Country Link
EP (1) EP0478359A3 (de)
GB (1) GB9021214D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1739351A1 (de) * 2005-06-30 2007-01-03 Orkli S. Coop. Stromversorgungsschaltung eines Sicherheitsventils für den Zündvorgang eines Gasbrenners

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2365755A1 (fr) * 1976-09-24 1978-04-21 Saunier Duval Dispositif electronique d'allumage en deux temps pour appareils a gaz commandes par electrovalve
EP0109696A1 (de) * 1982-09-27 1984-05-30 Veg-Gasinstituut N.V. Sicherheitsschaltung für ein System
GB2196500A (en) * 1986-08-29 1988-04-27 Baxi Partnership Ltd Time delay pulse circuit
EP0439417A1 (de) * 1990-01-26 1991-07-31 Société Anonyme CONSTRUCTIONS ELECTRIQUES R. V. Sicherheitsvorrichtung für einen Brennerbetrieb

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2365755A1 (fr) * 1976-09-24 1978-04-21 Saunier Duval Dispositif electronique d'allumage en deux temps pour appareils a gaz commandes par electrovalve
EP0109696A1 (de) * 1982-09-27 1984-05-30 Veg-Gasinstituut N.V. Sicherheitsschaltung für ein System
GB2196500A (en) * 1986-08-29 1988-04-27 Baxi Partnership Ltd Time delay pulse circuit
EP0439417A1 (de) * 1990-01-26 1991-07-31 Société Anonyme CONSTRUCTIONS ELECTRIQUES R. V. Sicherheitsvorrichtung für einen Brennerbetrieb

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1739351A1 (de) * 2005-06-30 2007-01-03 Orkli S. Coop. Stromversorgungsschaltung eines Sicherheitsventils für den Zündvorgang eines Gasbrenners

Also Published As

Publication number Publication date
GB9021214D0 (en) 1990-11-14
EP0478359A3 (en) 1992-08-05

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