EP0143865A1 - Commande de brûleur - Google Patents

Commande de brûleur Download PDF

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Publication number
EP0143865A1
EP0143865A1 EP83307395A EP83307395A EP0143865A1 EP 0143865 A1 EP0143865 A1 EP 0143865A1 EP 83307395 A EP83307395 A EP 83307395A EP 83307395 A EP83307395 A EP 83307395A EP 0143865 A1 EP0143865 A1 EP 0143865A1
Authority
EP
European Patent Office
Prior art keywords
signal
inhibiting
period
resistor
drive
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Withdrawn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
EP83307395A
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German (de)
English (en)
Inventor
Ronald Ellis
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP83307395A priority Critical patent/EP0143865A1/fr
Publication of EP0143865A1 publication Critical patent/EP0143865A1/fr
Withdrawn legal-status Critical Current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
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/20—Opto-coupler
    • 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
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • 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
    • F23N2231/00—Fail safe
    • F23N2231/20—Warning devices
    • F23N2231/22—Warning devices using warning lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers 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

Definitions

  • the invention relates to systems for controlling oil burners.
  • an oil burner control system comprises a thermostat which energises the system upon a call for heat; first, second and third solid-stpte switching means for coupling an air blower motor, an ignition device and a solenoid valve, respectively, to a power source; first solid-state drive means arranged to actuate the first switching mefns upon energising of the system; second and third solid-state drive means for actuating the second and third switching means, respectively, in response to respective drive signals; a first timing means responsive to energising of the system and arranged to provide the drive signal for the third drive means after a first period and to trigger a second timing means arranged to provide the drive signal for the second drive means from energising of the system until the end of a second period; means responsive to the drive signal provided by the second timing means and to the signal from a flame sensor and arranged to provide a first inhibiting signal for inhibiting all three drive means when the ignition sequence has failed to establish a flame or when an established flame goes
  • interlock logic circuit may be an interlock logic circuit to prevent the first timing means from being reset until after the end of the lock-out period.
  • the means arranged to provide the first inhibiting signal may be in the form of another timing means which provides the first inhibiting signal at the end of another period unless disabled by a "flame absent" signal from the flame sensor.
  • an indicator arranged to be energised whilst the three drive means are inhibited.
  • Each of the drive means may comprise a resistor arranged to supply to a control electrode of its associated switching means from a voltage supply line, the resistor being coupled by a respective clamping diode to the output of a transistor switch responsive to an inhibiting signal.
  • a resistor arranged to supply to a control electrode of its associated switching means from a voltage supply line, the resistor being coupled by a respective clamping diode to the output of a transistor switch responsive to an inhibiting signal.
  • Each of the switching means may comprise a TRIAC.
  • control system illustrated is suitable for use in a central heating system. It is only one example of forms which the invention might take.
  • the system is energised by means of a thermostat which can be positioned in a room to sense air temperature or on a weter cylinder or tank to sense the temperature of the water.
  • a thermostat which can be positioned in a room to sense air temperature or on a weter cylinder or tank to sense the temperature of the water.
  • the motor of the air blower and the ignition are energised for a period of about 15 seconds whilst the solenoid valve remains closed, in order to purge the nozzle region.
  • the solenoid valve is then opened and a steady flame is established at the burner nozzle, its presence being indicated by the signal from an optical sensor.
  • About 12 seconds after the solenoid valve was opened the ignition is switched off, provided that the flame is established, and the burner continues until the desired temperature is reached and the thermostat switches the system off.
  • the ignition, the motor and the solenoid valve are switched off and an indicator is brought on to show that no flame is present.
  • a feedback signal keeps these elements switched off for period of about 75 seconds, after which the control sequence can be started by means of a reset button.
  • the system is also switched off and disabled in the event that the flame, once established, is extinguished, for example by excessive down draught.
  • the transformer 12 has a centre-tapped secondary winding 20 which feeds a pair of diodes 21 arranged for full- wave rectification uith their anodes connected to an output terminal 22.
  • a capacitor 23 is connected between terminal 22 and an output terminal 24 which is connected to the centre-tap of the secondary winding 20.
  • a further secondary winding 25 is also provided: this feeds a bridge rectifier 26 whose output is connected to an output terminal 27 and the output terminal 22.
  • a smoothing capacitor 28 is connected betueen output terminals 22 and 27.
  • the transformer is selected so that, relative to terminal 24, terminal 22 provides a 3-volts negative power supply line and terminal 27 provides a 12-volts negative power supply line.
  • a bridge rectifier 30 has its input terminals connected across the resistor 14 and its output terminals connected to a smoothing capacitor 31. Connected in a series circuit across the capacitor 31 are a light-responsive resistor 32, a LED transmitter 33 of an optical coupler, and a resistor 34, comprising a flame sensor circuit.
  • resistor 32 can be responsive to infra-red radiation.
  • line 35 is connected to terminal 24, line 36 is connected to terminal 27 (-12 volts) and line 37 is connected to terminal 22 (-3 volts).
  • Capacitor 38 is directly connected to line 36 and is connected to line 35 via series-connected resistor 40 and variable resistor 41.
  • the junction of capacitor 38 and resistor 40 is connected via resistor 42 to the inputs of NAND gate 43 whose output is connected via resistor 44 to the inputs of NAND gate 45 and via resistor 46 to the inputs of NAND gate 47.
  • the output of gate 47 is connected to a line V which is connected via resistor 48 to the base of a control transistor 49 whose emitter is connected to line 35 and whose collector is connected via a load resistor 50 to line 37.
  • a TRIAC 51 is connected between line 35 and a terminal 52 to which the solenoid valve (not shown) is connected.
  • the gate of TRIAC 51 is connected via a pair of series-connected forward-biased diodes 53 to the collector of transistor 49 via a resistor 54 to line 35.
  • a voltage-dependent resistor 55 is connected between terminal 52 and line 35.
  • the capacitor 38 is in a discharged state having discharged through the power supply via a diode 56 connected across resistors 40 and 41. This renders the inputs of gate 43 high (i.e. towards line 36 relative to line 35) for a time delay determined by capacitor 38 and resistors 40 and 41. This delay is set at approximately 15 seconds in this particular embodiment.
  • a similar TRIAC control for the blower motor (not shown) comprises TRIAC 57, resistor 58, voltage-dependent resistor 59, a pair of diodes 60 and terminal 61; and a further similar TRIAC control for the ignition device (not shoun) comprises TRIAC 62, resistor 63, voltage-dependent resistor 64, a pair of diodes 65 and terminal 66.
  • Diodes 65 are connected to the collector of a transistor 67 having a load resistor 68 and a base resistor 69 in the same manner as transistor 49, but diodes 60 are coupled to line 37 via a load resistor 70 with no corresponding control transistor so the blower motor becomes energised as soon as the power lines become established upon closing of switch 10.
  • the output of gate 45 is connected via a resistor 71 and a clamping diode 72 to another RC delay circuit comprising capacitor 73, resistor 74, and variable resistor 75, which is set to provide a delay of approximately 12 seconds.
  • the junction of capacitor 73 and resistor 74 is connected via resistor 76 to the inputs of a NAND gate 77 whose output is connected to a line T which is connected to base resistor 69 of control transistor 67.
  • Gate 77 is also connected via a resistor 78 to the inputs of a NPND gate 79 whose output is connected via a resistor 80 and a series-connected clamping diode 81 to a capacitor 82 connected to line 36.
  • the junction of diode 81 and capacitor 82 is connected via resistor 83 to the inputs of a NAND gate 84 uhose output is connected via resistor 85 to the inputs of a NAND gate 86 whose output is connected to a line 8; and this junction is connected to line 35 via series-connected resistors 87 and 88.
  • the receiver part 89 of the optical couples is connected between line 36 and the junction of resistors 87 and 88.
  • the low output of gate 77 drives the output of gate 79 high which clamps the input of gate 84 high, so causing line B to be high.
  • This signal is fed via a resistor 90 to the base of an NPR transistor 91 whose emitter is connected to line 36 and whose collector is connected to line 35 via a resistor 9?, to the b p se of a PNP transistor 93 via a resistor 94 and to the base of a PNP transistor 95 via a capacitor 96.
  • Transistor 93 has a load resistor 97 connected to line 36, and its collector is connected to diodes 53, 60 and 65 via respective diodes 98, 99 and 100, and to a forward-biased diode 101 which in turn is connected to line 36 via series-connected resistor 102 and LED 103.
  • transistors 91 end 93 are non-conducting and diodes 98, 99 and 100 are reverse-biased via resistor 97 and do not disable the TRIAC drives.
  • the collector of transistor 95 is connected to line FB feedback which is connected vie diode 104 and resistor 105 to the input of NAND gate 106, and the junction of diode 104 and resistor 105 is connected via parallel- connected resistor 107 and capacitor 108 to line 36.
  • the output of gate 106 is connected to line A which is connected to the base of a PNP transistor 109 via a resistor 110, the collector is connected to line 36 and the emitter is connected to line 35 via a resistor 111 and to the base of a PNP transistor 112 via a resistor 113.
  • Transistor 112 has a load resistor 114 connected to line 36 and its collector is connected to diodes 53, 60 and 65 via respective diodes 115, 116 and 117 and to resistor 102 via diode 118.
  • transistor 95 will be non-conducting because transistor 91 is non-conducting, and the input of gate 106 uill be held high via resistors 105 and 107.
  • line A will be low and transistors 109 and 112 will be non-conducting and diodes 115, 116 and 117 are reverse-biased via resistor 114 and do not disable the TRIAC drives.
  • capacitor 96 When capacitor 96 becomes fully charged, there is no base current for transistor 95 which then ceases conducting and allows capacitor 108 to start discharging via resistor 107 back to its normal level.
  • the delay set for this is approximately 75 seconds and during this period the signal on line A remains high thus inhibiting any action of the TRIRC circuits in response to signals on lines T rnd U, and energising the alarm LED 103.
  • a manual reset push-button 119 is connected across cap- aoitor 38 and, upon actuation, short-circuits capacitor 38 to provide a high signal to the input of gate 43.
  • gates 45 and 79 provide high outputs uhich discharge capacitors 73 and 82 via diodes 72 and 81, respectively, and the ignition timing sequence is ready to recommence.
  • the signal on line 8 goes high when push-button 119 is actuated, but as explained, the signal on line A will inhibit the TRIAC circuits for approximately 75 seconds. If an operator actuates the push-button 119 during this period, it will be immediately apparent because the alarm LED 103 will not extinguish. The operator will remain pressing the push-button 119 until at the end of this period the signal on line A goes low and the LED 103 extinguishes.
  • receiver 89 of the optical coupler will be conducting and will provide a high signal via resistor 87 to the input of gate 84.
  • the system is in a steady state with the blower on, the solenoid valve open, the ignition device off and an established flame.
  • capacitor 38 will start charging via resistors 40 and 41 as soon as the operator releases the reset push-button 119. Thus if he attempts a restart during the lock-out period he will have to keep the reset push-button aotuated until the LED 103 extinguishes in order to start the timing sequence at the correct time. If the push-button 119 is released some time before the end of the lock-out period then the 15 second purge period could finish without any purge action having taken place, and the system could go straight into the ignition phase as the signal on line A goes low. If it desired to ensure that capacitor 38 can be discharged by the reset push-button 119 only after the end of the lock-out period, then a suitable logic circuit could be included which would inhibit the reset action while the signal on line A was high.
  • Diode 56 provides protection for the input circuitry of gate 43 when the voltage on line 36 collapses and the positive plate of capacitor 38 tries to go more positive than line 35.
  • Gates 77 and 84 have their input circuitry similarly protected by diodes 120 and 121, respectively.
  • the signals on lines A and B for inhibiting the TRIACs drive separate transistors 93 and 112. If desired, a single transistor could be used with appropriate gating circuitry receiving the signals on lines A and B.
  • TRIACs have been used in the above circuits to switch the solenoid valve etc.
  • other solid-state switching devices for example silicon controlled rectifiers - could be used with appropriate circuitry.
  • the described system has, apart from the thermostat switch and the manual reset, no mechanical contacts or moving parts.
  • the switches and their drive circuits, and the logic timing circuits, are all based on solid-state devices.

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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)
EP83307395A 1983-12-06 1983-12-06 Commande de brûleur Withdrawn EP0143865A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP83307395A EP0143865A1 (fr) 1983-12-06 1983-12-06 Commande de brûleur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83307395A EP0143865A1 (fr) 1983-12-06 1983-12-06 Commande de brûleur

Publications (1)

Publication Number Publication Date
EP0143865A1 true EP0143865A1 (fr) 1985-06-12

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EP83307395A Withdrawn EP0143865A1 (fr) 1983-12-06 1983-12-06 Commande de brûleur

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EP (1) EP0143865A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002008668A1 (fr) * 2000-07-21 2002-01-31 Honeywell International Inc. Purge de pompe a mazout
WO2002048613A1 (fr) * 2000-12-11 2002-06-20 Honeywell International Inc. Mode de fonctionnement restreint pour circuit de combustible
US8141788B2 (en) 2008-02-11 2012-03-27 Marine Canada Acquisition Inc. Thermostatic control device
US8931707B2 (en) 2008-02-11 2015-01-13 Marine Canada Acquisition Inc. Appliance with thermostatic controls

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514240A (en) * 1967-07-06 1970-05-26 Liberty Combustion Corp Fluid fuel ignition control system
US3705783A (en) * 1971-07-21 1972-12-12 Honeywell Inc Burner safeguard control apparatus
GB2069720A (en) * 1980-01-24 1981-08-26 Yamatake Honeywell Co Ltd Circuitry for checking a load control apparatus
DE3022587A1 (de) * 1980-06-16 1982-01-14 G. Kromschröder AG, 4500 Osnabrück Brennsteuergeraet zum aufsteuern eines gasventils und eines luftventils
US4352656A (en) * 1979-09-21 1982-10-05 American Stabilis, Inc. Gas appliance control device
US4370126A (en) * 1978-09-11 1983-01-25 Hitaci, Ltd. Combustion control apparatus
GB2120807A (en) * 1982-03-06 1983-12-07 Ronald Ellis Burner control

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514240A (en) * 1967-07-06 1970-05-26 Liberty Combustion Corp Fluid fuel ignition control system
US3705783A (en) * 1971-07-21 1972-12-12 Honeywell Inc Burner safeguard control apparatus
US4370126A (en) * 1978-09-11 1983-01-25 Hitaci, Ltd. Combustion control apparatus
US4352656A (en) * 1979-09-21 1982-10-05 American Stabilis, Inc. Gas appliance control device
GB2069720A (en) * 1980-01-24 1981-08-26 Yamatake Honeywell Co Ltd Circuitry for checking a load control apparatus
DE3022587A1 (de) * 1980-06-16 1982-01-14 G. Kromschröder AG, 4500 Osnabrück Brennsteuergeraet zum aufsteuern eines gasventils und eines luftventils
GB2120807A (en) * 1982-03-06 1983-12-07 Ronald Ellis Burner control

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002008668A1 (fr) * 2000-07-21 2002-01-31 Honeywell International Inc. Purge de pompe a mazout
US6478574B1 (en) 2000-07-21 2002-11-12 Honeywell International Inc. Pump purge for oil primary
WO2002048613A1 (fr) * 2000-12-11 2002-06-20 Honeywell International Inc. Mode de fonctionnement restreint pour circuit de combustible
US8141788B2 (en) 2008-02-11 2012-03-27 Marine Canada Acquisition Inc. Thermostatic control device
US8141789B2 (en) 2008-02-11 2012-03-27 Marine Canada Acquisition Inc. Method for controlling the temperature of an appliance
US8931707B2 (en) 2008-02-11 2015-01-13 Marine Canada Acquisition Inc. Appliance with thermostatic controls

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