EP0029102B1 - Dispositif de commande pour brûleur à mazout avec préchauffage du mazout - Google Patents

Dispositif de commande pour brûleur à mazout avec préchauffage du mazout Download PDF

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Publication number
EP0029102B1
EP0029102B1 EP80105839A EP80105839A EP0029102B1 EP 0029102 B1 EP0029102 B1 EP 0029102B1 EP 80105839 A EP80105839 A EP 80105839A EP 80105839 A EP80105839 A EP 80105839A EP 0029102 B1 EP0029102 B1 EP 0029102B1
Authority
EP
European Patent Office
Prior art keywords
oil
burner
switch
limit value
electronic 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.)
Expired
Application number
EP80105839A
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German (de)
English (en)
Other versions
EP0029102A1 (fr
Inventor
Hans Schütz
Hans Strasser
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.)
Siemens Building Technologies AG
Original Assignee
LGZ Landis and Gyr Zug AG
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 LGZ Landis and Gyr Zug AG filed Critical LGZ Landis and Gyr Zug AG
Publication of EP0029102A1 publication Critical patent/EP0029102A1/fr
Application granted granted Critical
Publication of EP0029102B1 publication Critical patent/EP0029102B1/fr
Expired 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
    • F23N5/24—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
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/14—Details thereof
    • F23K5/20—Preheating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2221/00—Pretreatment or prehandling
    • F23N2221/04—Preheating liquid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/12—Burner simulation or checking

Definitions

  • the invention relates to a control device for an oil burner with an oil preheater according to the preamble of claim 1.
  • a control device on an oil preheater is already known (DE-A-2719 573), which has a heating device arranged directly in front of the burner nozzle in the flow direction.
  • the control device consists of at least one temperature controller which only starts the burner when the heating oil temperature in front of the burner nozzle has exceeded a minimum value.
  • temperature controller regulating the oil temperature or by a second temperature controller specially provided for this purpose.
  • the arrangement of temperature regulators on a nozzle assembly of an oil burner requires space and several electrical supply lines. Every welding of the bimetal switches, which are mostly used for temperature monitoring, means starting the burner with not preheated oil, which leads to incomplete combustion with soot emissions and poor use of the fuel energy.
  • the invention has for its object to provide a control device which indicates defects in the oil preheater and its temperature control with little effort or prevents the operation of the burner.
  • FIG. 1, 1 means an automatic burner control system indicated by a broken line, which can be arranged in a housing and has connecting terminals which lead to the outside and which are denoted by small circles, but are not named further.
  • a phase conductor 2 From a phase conductor 2 there is a connection via the contacts of a thermostat 3, for example influenced by the room temperature, and a fault shutdown contact 5 to a feed line 6.
  • the latter also serves as a feed line to a control and monitoring device designed as an electronic circuit 7, which is described below is.
  • the burner control unit 1 also contains a flame monitor 8 with a flame sensor 9 and a flame relay 10 and a timer 11.
  • a switch contact 12 of the flame relay 10 is coupled to a changeover switch 13 of the timer 11 and both control an ignition device 14 and two solenoid valves 15 and in a known manner 16, while a burner motor 17 can be connected directly to the feed line 6 directly from the switch 18 of a relay 19 actuated by the electronic circuit 7.
  • the elements 8 to 16 are also connected to voltage via the switch 18, so that burner operation is not possible when the switch 18 is open.
  • the elements 8 to 16 are connected to a neutral conductor 21 by a manifold 20 as necessary.
  • the electronic circuit 7 is connected to the manifold 20 by a connection 22 and to the feed line 6 by a further connection 23.
  • the contact that feeds the elements 8 to 16 when the switch 18 is closed is connected to the electronic circuit 7 by a tap 24. With the tap 24, the electronic circuit 7 continuously monitors the position of the switch 18 and compares it with the voltage on the coil of the relay 19, ie it is always as long as the thermostat 3 is closed that the actual state of the switch 18 is compared with the desired state. This ensures that the burner can only be started correctly if the switch 18 is intact.
  • An output 25 connects the electronic circuit 7 to the flame monitor 8 and, in the event of a faulty switch position, causes the burner control to lock out by detuning the amplifier of the flame monitor 8 so much that the flame relay 10 no longer picks up. The flame relay can therefore no longer display a flame and the automatic burner control 1 runs in the fault position.
  • Other solutions for the evaluation of a signal at output 25 are also possible, e.g. B. the triggering of a fuse or the direct, permanent heating of the thermal timer 11 until the fault is triggered.
  • a PTC thermistor serves as the heating element for the oil preheater, and several such PTC resistors can also be arranged in series and / or parallel connection in the oil preheater directly in front of the nozzle of an oil burner.
  • the PTC 27 itself regulates the heating current according to its non-linear resistance / temperature curve.
  • a resistor 26 is connected in the heating circuit to monitor the time profile of the current to the heating element of the oil preheater. This forms a series connection with the PTC 27, which is connected between the feed line 6 and the collecting line 20. Another connection 28 leads to the electronic circuit 7 and is tapped at the line between the resistor 26 and the PTC 27. The voltage drop across the resistor 26 is continuously monitored by the electronic circuit 7 via the two connections 23 and 28. This enables the temperature in the oil preheater to be recorded by monitoring the time profile of the current in the PTC 27.
  • the relay 19 is only actuated when the circuit to the PTC 27 is intact, that is to say when there is no short circuit or no interruption in the heating circuit. and if the monitored current to the PTC 27 and thus its temperature is within specified limits.
  • the electronic circuit 7 is designed such that it closes the switch 18 when the current in the heating circuit drops below an on-limit value 33. This happens at time 34 and means that the heating oil has reached the temperature necessary for the safe operation of the burner.
  • the on limit value 33 lies above the lower limit value 29.
  • Another limit for the current 1 is an off limit value 35. Oil temperatures corresponding to this or higher current values exceed the required operating temperature and should not occur during normal operation.
  • the off limit value 35 is below the upper limit value 30, but above the on limit value 33.
  • the burner starts, which releases the fuel at the time 36 after the pre-ignition time has elapsed.
  • the heated heating oil flows to the nozzle and cold oil flows in continuously, which causes the PTC 27 to consume more power.
  • the current 1 increases and a new equilibrium state is established in accordance with the curve part 37.
  • the magnitude of the current I may not normally reach the off limit value 35, otherwise the electronic circuit 7 would open the switch 18 again and interrupt the burner operation as a fault. (Monitoring the correct operating temperature of the heating oil).
  • the position of the on and off limit values 33 and 35 is selected in accordance with the resistance / temperature characteristic of the PTC used, so that when the burner is in trouble-free operation, the permissible oil temperature can only be monitored by taps 23, 28 via resistor 26, whereby the same taps 23, 28 also serve to test for interruptions and short circuits. A temperature sensor can therefore be dispensed with.
  • the voltage tapped across the resistor 26 is fed from the connections 23 and 28 to an amplifier 46, the output 47 of which, after rectification, is applied to three limit switches 48, 49 and 50 acts.
  • the first limit switch 48 (with switching hysteresis) transmits a signal to the relay 19 at its output 51 when the current in the heating circuit falls below the on limit value 33 (FIG. 2).
  • the signal causes relay 19 to pick up and enables the burner to operate. If the current I in operation rises above the off limit value 35 (FIG. 2) due to some fault, the signal at the output 51 disappears again, the relay 19 drops out and the burner is switched off again by the switch 18.
  • the output 51 is also connected to a first, inverting input of an AND logic 52, while its second, non-inverting input is connected to the tap 24 via a rectifying coupling element 53 is. If there is line voltage at tap 24 because, for example, switch 18 is closed while relay 19 is not energized, then the same signals are not present at the two inputs of AND logic 52, which activates the output of AND logic 52. Its output is connected to an input of an OR logic 54. This has three inputs, and if one of these receives a signal, in the case described from the output of the AND logic 52, its output, which is identical to the output 25 of the electronic circuit, triggers a lockout of the automatic firing unit 1, such as this is described above.
  • the outputs of the second and third limit switches 49 and 50 are connected to the second and. third input of OR logic 54 connected.
  • the limit switch 49 emits a signal when the current I (FIG. 2) falls below the lower limit value 29, and a signal appears at the limit switch 50 when the upper limit value 30 is exceeded. In both cases, as previously described for the first input of OR logic 54, a lockout is triggered.
  • the electronic circuit 7 together with the resistor 26 and the relay 19 is part of the burner control unit 1, which is necessary anyway for the operation of the burner, and is therefore arranged in its housing.
  • This allows the combination of a small outlay on equipment with the advantage that the blocking of the burner operation required for monitoring the switch 18 and the circuit of the oil preheating in the event of a fault can be taken over by the elements which must also respond in the event of a burner malfunction.

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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 (5)

1. Dispositif de commande pour brûleur à mazout avec préchauffage du mazout, dispositif qui présente au moins un élément chauffant couplé thermiquement avec le mazout, et un élément de commutation sensible à la température du mazout et qui ne permet le fonctionnement du brûleur que dans une gamme déterminée de la température du mazout, ledit dispositif étant caractérisé en ce qu'un montage électronique (7), agissant sur l'élément de commutation (18) en fonction de la température du mazout, sert en même temps à la surveillance de l'état effectif de l'élément de commutation (18) disposé dans le circuit de mise en marche du brûleur à mazout, par rapport à son état de consigne, et fait partie, conjointement avec l'élément de commutation (18) d'un coffret de sécurité (1) de toute façon nécessaire pour le fonctionnement du brûleur à mazout.
2. Dispositif de commande suivant la revendication 1, caractérisé en ce que, pour la surveillance de la position de commutation de l'élément de commutation (18), la connexion de celui-ci côté brûleur est reliée par une prise (24) au montage électronique (7), tandis que le montage électronique (7) présente une sortie (25), qui sert à assurer, dans le cas d'une position de commutation incorrecte, un empêchement de mise en marche ou un arrêt du coffret de sécurité pour perturbation.
3. Dispositif de commande suivant la revendication 2, caractérisé en ce que l'élément de commutation est un relais (19) comportant un interrupteur (18), dont la position surveille en permanence au moyen de la prise (24) le montage électronique (7) par comparaison avec la tension de la bobine de relais (19).
4. Dispositif de commande suivant la revendication 1, caractérisé en ce que l'élément chauffant est une PTC (27) assurant elle-même la régulation du courant de chauffage par sa caractéristique résistance/température non linéaire, et en ce que la détection de la température dans le préchauffeur de mazout s'effectue par une surveillance de l'allure temporelle du courant dans la PTC (27), à l'effet de quoi une résistance (26) est montée dans le circuit de chauffage du préchauffeur de mazout, résistance dont la chute de tension surveillée par le montage électronique (7) par l'intermédiaire de deux connexions (23, 28) n'actionne l'élément de commutation (18) que si le circuit de l'élément chauffant est intact et si le courant alimentant la PTC (27) est compris entre des limites prédéterminées,
5. Dispositif de commande suivant la revendication 4, caractérisé en ce que le relais (19) et son interrupteur (18) ne peuvent être commutés à la position de marche par le montage électronique (7) que lorsque le courant (I), dans le circuit de chauffage (26, 27) tombe au-dessous d'une valeur limite de marche (33), valeur qui est située au-dessus d'une valeur limite inférieure (29), tandis que, lors d'un accroissement du courant (I) jusqu'au-dessus d'une valeur limite d'arrêt (35), l'interrupteur (18) se rouvre, la valeur limite d'arrêt (35) étant située au-dessous d'une valeur limite supérieure (30) mais au-dessus de la valeur limite de marche (33).
EP80105839A 1979-11-15 1980-09-26 Dispositif de commande pour brûleur à mazout avec préchauffage du mazout Expired EP0029102B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH10226/79 1979-11-15
CH1022679 1979-11-15

Publications (2)

Publication Number Publication Date
EP0029102A1 EP0029102A1 (fr) 1981-05-27
EP0029102B1 true EP0029102B1 (fr) 1983-05-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105839A Expired EP0029102B1 (fr) 1979-11-15 1980-09-26 Dispositif de commande pour brûleur à mazout avec préchauffage du mazout

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EP (1) EP0029102B1 (fr)
DE (1) DE3063162D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29822041U1 (de) * 1998-12-10 2000-01-20 Satronic Ag Dielsdorf Steuerungsvorrichtung für Ölbrenner
DE102004059148A1 (de) * 2004-12-08 2006-06-14 Webasto Ag Brennervorrichtung für flüssigen Brennstoff

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1958017A1 (de) * 1969-11-13 1971-05-19 Licentia Gmbh Schaltungsanordnung zur gesicherten Steuerung von Schalthandlungen
DE2040523C3 (de) * 1970-08-14 1973-09-20 Danfoss A/S, Nordborg (Daenemark) Heizvorrichtung mit PTC Widerstand
DE2056450A1 (de) * 1970-11-17 1972-05-18 Hoffmann K Kontaktlose Umgebungs-Einflüsse erfassende Allölaufheizungs-Vorrichtung
US3954383A (en) * 1973-09-17 1976-05-04 Electronics Corporation Of America Burner control system
US4081660A (en) * 1976-07-06 1978-03-28 Baxter Travenol Laboratories, Inc. Heater shutdown circuit
ATA846076A (de) * 1976-11-12 1980-04-15 Schwarz Anton Oelbrenner
CH628133A5 (de) * 1976-11-12 1982-02-15 Anton Schwarz Oelbrenner mit druckzerstaeuberduese fuer heizoel.
US4162887A (en) * 1977-05-23 1979-07-31 Greenmace Limited Oil burner
DE2724558C3 (de) * 1977-05-31 1979-12-06 Dr. Karl Thomae Gmbh, 7950 Biberach Thermistorschaltung für ein chirurgisches Schneid- und/oder Koagulationsinstrument

Also Published As

Publication number Publication date
EP0029102A1 (fr) 1981-05-27
DE3063162D1 (en) 1983-06-16

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