EP0233349B1 - Combustion method and liquid fuel burner - Google Patents

Combustion method and liquid fuel burner Download PDF

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Publication number
EP0233349B1
EP0233349B1 EP19860117396 EP86117396A EP0233349B1 EP 0233349 B1 EP0233349 B1 EP 0233349B1 EP 19860117396 EP19860117396 EP 19860117396 EP 86117396 A EP86117396 A EP 86117396A EP 0233349 B1 EP0233349 B1 EP 0233349B1
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EP
European Patent Office
Prior art keywords
valve
pump
pressure
fuel
burner
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
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EP19860117396
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German (de)
French (fr)
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EP0233349A1 (en
Inventor
Elmar Goller
Heinrich Eickhoff
Albrecht Kayser
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Deutsches Zentrum fuer Luft und Raumfahrt eV
Original Assignee
Deutsche Forschungs und Versuchsanstalt fuer Luft und Raumfahrt eV DFVLR
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/42—Starting devices
    • 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
    • F23K5/04—Feeding or distributing systems using pumps
    • 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
    • F23K5/147—Valves

Definitions

  • the invention relates to a method of the type specified in the preamble of claim 1.
  • a method of the type specified in the preamble of claim 1 is known from CH-A-345 289.
  • the pump consists of a gear pump, one of whose gear has a slot which also forms the valve leading to the nozzle.
  • a pressure accumulator is connected between the pump and the valve. During each revolution of the gearwheel having the slot, the slot comes into connection with the nozzle, so that the pressure accumulator discharges and, in addition to the continuously conveyed fuel, the content of the pressure accumulator is expelled from the nozzle.
  • Such a burner is particularly suitable for intermittent operation in kilns, in particular ceramic ovens.
  • the pressure accumulator serves to adapt the continuously pumping pump to the intermittent operation of the nozzle, but has no influence on the ignition behavior.
  • DE-B-1 269 277 describes a burner in which a check valve is present between the pump and the pressure accumulator.
  • the pressure accumulator serves to compensate for fluctuations in consumption and ensures that the supply pressure is as uniform as possible. Here too the pressure accumulator has no effect on the ignition behavior.
  • a burner known from US-A-4 416 592 contains a valve which opens the fuel supply to the nozzle depending on the pump pressure.
  • a collecting container is connected to the cylinder chamber of the valve, which contains a float ball.
  • the float ball only closes an outlet of the collecting container leading back to the tank when the collecting container is completely filled. Only from this point on can pressure build up in the cylinder chamber. This also does not improve the ignition behavior of the burner.
  • the invention has for its object to provide a method of the type mentioned, which enables simple ignition even at high outflow speeds of the fuel from the nozzle.
  • the fuel delivered by the pump is directed into the pressure accumulator, which is thereby charged. If the valve is opened abruptly, the pressure accumulator discharges via the valve to the nozzle, so that the fuel / air mixture that emerges from the nozzle is briefly enriched. This mixture is easily ignitable.
  • the pressure accumulator connected to the fuel line has no effect.
  • the valve which is preferably a switching valve, remains open.
  • the invention further relates to a burner for carrying out the method with the features of claim 2.
  • the pump is a positive displacement pump which is bridged by a return line containing a pressure-dependent opening second valve.
  • the positive displacement pump e.g. B. a gear pump or a piston pump, delivers a fuel volume proportional to the pump speed to the fuel line.
  • a pressure builds up in front of this valve, through which the pressure accumulator is charged.
  • the first valve is open, the fuel is supplied to the nozzle in an amount that is dependent on the pump speed.
  • the return branch is provided, which is bridged by the second valve.
  • the pressure accumulator and the second valve can be designed as a common assembly, the second valve simultaneously taking over the function of the pressure accumulator.
  • the second valve has a spring-loaded piston which is movable in a cylinder and together with this forms the pressure accumulator, and that the cylinder has an opening which is connected to the pump inlet and which is connected to the pump outlet when the Pressure at the pump outlet pushes the piston back over the opening.
  • a fuel line 10 leads from a positive displacement pump 11 to the nozzle 12.
  • the nozzle 12 is surrounded by a jacket 13 which is connected to an air duct 14 is connected and has an outlet 15 in the vicinity of the nozzle opening.
  • the fuel emerging from the nozzle opening mixes with the air emerging from the outlet 15.
  • An electrode arrangement 16 is used to generate an arc for igniting the flame.
  • the fuel line 10 contains a valve 17 which is designed as a switching valve and can be opened by a controller 18 for a predetermined time.
  • the pressure accumulator 19 in the form of a gas pressure accumulator is connected to the fuel line 10 in the flow path upstream of the valve 17.
  • the gas pressure accumulator contains a gas volume 20, which is closed off from the fuel line 10 by a flexible and stretchable membrane 21 or a freely movable piston.
  • the return branch 22 leads from the pump outlet 11 to the pump inlet 11 a.
  • the return branch 22 contains a spring-loaded check valve 23 which only opens from the pump outlet 11 to the pump inlet 11a when the pressure at the pump outlet exceeds a predetermined threshold value.
  • the opening pressure of the check valve 23 is dimensioned such that the check valve opens when the pressure accumulator 19 has received its maximum amount of liquid. In this way, an overload of the fuel line 10, the pressure accumulator 19 and the valve 17 is avoided.
  • the valve 17 To ignite the flame, the valve 17 is closed so that the pump 11 conveys fuel from the supply line 24 to the fuel line 10 and the pressure accumulator is charged. After the pressure accumulator 19 is charged, the valve 17 is opened abruptly, so that the pressure accumulator 19 discharges into the fuel line 10 to the nozzle 12 and, in addition to the delivery volume of the pump 11, provides a further fuel volume for a short time. While the amount of air that is supplied to the inlet 14 of the jacket 13 remains constant, the amount of fuel increases temporarily, so that an enriched mixture flows into the combustion chamber, which can be easily ignited by the electrode arrangement 16.
  • the pressure accumulator 19 contains a spring 25, which presses a piston 26, which is arranged in the return branch 22 and can be moved in a cylinder 27, in the direction of the fuel line 10.
  • the cylinder 27 has a lateral opening 28 through which the piston 26 can be pushed away by the pressure of the fuel line 10, so that the return branch 22 is opened and the pump outlet 11 is connected to the pump inlet 11a.
  • the spring 25 presses the piston 26 against a stop 29. Since the piston 26 lies sealingly against the wall of the cylinder 27, no fuel can flow from the pump inlet 11a via the return branch 22 to the pump outlet 11b when the spring 25 is unloaded.
  • the pressure accumulator 19 therefore also assumes the function of the check valve 23 in FIG. 1.
  • the spring 25 is supported on the piston-like support member 30 which engages with a threaded bolt 31 in a thread in the end wall 32 of the cylinder 27.
  • the bias of the spring 25 can be changed.
  • the valve 17 is shut off.
  • the operation of the displacement pump 11 increases the pressure in the fuel line 10, as a result of which the pressure accumulator 19 is charged, ie. H. the piston 26 is pushed against the force of the spring 25 from the stop. If the pressure exceeds the threshold value predetermined by the axial position of the support member 30, then the return branch 22 is opened by retracting the piston 26 and the pump 11 delivers in a closed circuit.
  • the valve 17 is opened, the spring 25 pushes through the piston 26 the amount of liquid stored in the pressure accumulator through the fuel line 10 to the nozzle 12.
  • the amount of liquid to be taken up by the pressure accumulator 19 is limited by opening the return branch 22.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)

Description

Die Erfindung betrifft ein Verfahren der im Oberbegriff des Patentanspruchs 1 angegebenen Art.The invention relates to a method of the type specified in the preamble of claim 1.

Wenn bei einem Brenner das Brennstoffgemisch eine hohe Strömungsgeschwindigkeit hat, besteht eine Schwierigkeit darin, die Flamme zu zünden. Es ist bekannt, zum Zünden der Flamme einen zusätzlichen Zündbrenner einzusetzen, aus dem Brennstoff mit relativ geringer Geschwindigkeit austritt und der sich demnach leicht zünden läßt. Mit der Flamme des Zündbrenners wird dann die Flamme des Hauptbrenners gestartet. Eine leichtere Zündung erfolgt auch, wenn man beim Start kurzfristig das Brennstoff/Luft-Gemisch anfettet, d. h. den Brennstoffanteil erhöht.When the fuel mixture has a high flow rate in a burner, there is a problem in igniting the flame. It is known to use an additional pilot burner for igniting the flame, from which fuel emerges at a relatively slow speed and which can therefore be easily ignited. The flame of the main burner is then started with the flame of the pilot burner. Ignition is also easier if the fuel / air mixture is briefly greased at the start, i.e. H. increases the fuel percentage.

Ein Verfahren der im Oberbegriff des Patentanspruchs 1 angegebenen Art ist bekannt aus CH-A-345 289. Bei diesem Brenner besteht die Pumpe aus einer Zahnradpumpe, deren eines Zahnrad einen Schlitz aufweist, der zugleich das zu der Düse führende Ventil bildet. Zwischen Pumpe und Ventil ist ein Druckspeicher angeschlossen. Während jeder Umdrehung des den Schlitz aufweisenden Zahnrades gelangt der Schlitz in Verbindung mit der Düse, so daß der Druckspeicher sich entlädt und zusätzlich zu dem kontinuierlich geförderten Brennstoff der Inhalt des Druckspeichers aus der Düse ausgestoßen wird. Ein solcher Brenner ist speziell für Intervallbetrieb in Brennöfen, insbesondere keramischen Öfen, geeignet. Der Druckspeicher dient der Anpassung der kontinuierlich fördernden Pumpe an den intermittierenden Betrieb der Düse, hat aber auf das Zündverhalten keinen Einfluß.A method of the type specified in the preamble of claim 1 is known from CH-A-345 289. In this burner, the pump consists of a gear pump, one of whose gear has a slot which also forms the valve leading to the nozzle. A pressure accumulator is connected between the pump and the valve. During each revolution of the gearwheel having the slot, the slot comes into connection with the nozzle, so that the pressure accumulator discharges and, in addition to the continuously conveyed fuel, the content of the pressure accumulator is expelled from the nozzle. Such a burner is particularly suitable for intermittent operation in kilns, in particular ceramic ovens. The pressure accumulator serves to adapt the continuously pumping pump to the intermittent operation of the nozzle, but has no influence on the ignition behavior.

DE-B-1 269 277 beschreibt einen Brenner, bei dem zwischen Pumpe und Druckspeicher ein Rückschlagventil vorhanden ist. Der Druckspeicher dient zum Ausgleich der Verbrauchsschwankungen und stellt einen möglichst gleichmäßigen Versorgungsdruck sicher. Auch hier hat der Druckspeicher keine Auswirkungen auf das Zündverhalten.DE-B-1 269 277 describes a burner in which a check valve is present between the pump and the pressure accumulator. The pressure accumulator serves to compensate for fluctuations in consumption and ensures that the supply pressure is as uniform as possible. Here too the pressure accumulator has no effect on the ignition behavior.

Ein aus US-A-4 416 592 bekannter Brenner enthält ein Ventil, das in Abhängigkeit vom Pumpendruck die Brennstoffzufuhr zur Düse öffnet. Zur Verzögerung des Öffnens des Ventils ist an den Zylinderraum des Ventils ein Sammelbehälter angeschlossen, der eine Schwimmerkugel enthält. Die Schwimmerkugel verschließt einen zum Tank zurückführenden Auslaß des Sammelbehälters erst dann, wenn der Sammelbehälter vollständig gefüllt ist. Erst von diesem Zeitpunkt ab ist im Zylinderraum ein Druckaufbau möglich. Auch hierdurch wird das Zündverhalten des Brenners nicht verbessert.A burner known from US-A-4 416 592 contains a valve which opens the fuel supply to the nozzle depending on the pump pressure. To delay the opening of the valve, a collecting container is connected to the cylinder chamber of the valve, which contains a float ball. The float ball only closes an outlet of the collecting container leading back to the tank when the collecting container is completely filled. Only from this point on can pressure build up in the cylinder chamber. This also does not improve the ignition behavior of the burner.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu schaffen, das mit einfachen Mitteln auch bei hohen Ausströmgeschwindigkeiten des Brennstoffs aus der Düse eine sichere Zündung ermöglicht.The invention has for its object to provide a method of the type mentioned, which enables simple ignition even at high outflow speeds of the fuel from the nozzle.

Die Lösung dieser Aufgabe erfolgt erfindungsgemäß mit den Merkmalen des kennzeichnenden Teiles des Anspruchs 1.This object is achieved according to the invention with the features of the characterizing part of claim 1.

Bei dem erfindungsgemäßen Verfahren wird vor dem Zünden bei geschlossenem Ventil, d. h. bei abgesperrter Brennstoffleitung, der von der Pumpe geförderte Brennstoff in den Druckspeicher geleitet, der sich dadurch auflädt. Wird das Ventil schlagartig geöffnet, dann entlädt sich der Druckspeicher über das Ventil zur Düse, so daß kurzzeitig eine Anfettung des Brennstoff/Luft-Gemisches, das aus der Düse austritt, entsteht. Dieses Gemisch ist leicht zündbar. Beim normalen Betrieb des Brenners wirkt sich der an die Brennstoffleitung angeschlossene Druckspeicher nicht aus. Das Ventil, das vorzugsweise ein Schaltventil ist, bleibt geöffnet.In the method according to the invention, before the ignition with the valve closed, i. H. when the fuel line is shut off, the fuel delivered by the pump is directed into the pressure accumulator, which is thereby charged. If the valve is opened abruptly, the pressure accumulator discharges via the valve to the nozzle, so that the fuel / air mixture that emerges from the nozzle is briefly enriched. This mixture is easily ignitable. During normal operation of the burner, the pressure accumulator connected to the fuel line has no effect. The valve, which is preferably a switching valve, remains open.

Die Erfindung betrifft ferner einen Brenner zur Durchführung des Verfahrens mit den Merkmalen des Anspruchs 2.The invention further relates to a burner for carrying out the method with the features of claim 2.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist die Pumpe eine Verdrängerpumpe, die von einer ein druckabhängig öffnendes zweites Ventil enthaltenden Rücklaufleitung überbrückt ist. Die Verdrängerpumpe, z. B. eine Zahnradpumpe oder eine Kolben-Pumpe, liefert ein der Pumpendrehzahl proportionales Brennstoffvolumen an die Brennstoffleitung. Wenn das in der Brennstoffleitung liegende erste Ventil geschlossen ist, baut sich vor diesem Ventil ein Druck auf, durch den der Druckspeicher aufgeladen wird. Bei geöffnetem ersten Ventil wird der Düse der Brennstoff in einer Menge zugeführt, die von der Pumpendrehzahl abhängig ist. Um bei geschlossenem ersten Ventil einen zu hohen Druckanstieg am Pumpenauslaß zu vermeiden, ist der Rücklaufzweig vorgesehen, der durch das zweite Ventil überbrückt ist.According to a preferred embodiment of the invention, the pump is a positive displacement pump which is bridged by a return line containing a pressure-dependent opening second valve. The positive displacement pump, e.g. B. a gear pump or a piston pump, delivers a fuel volume proportional to the pump speed to the fuel line. When the first valve in the fuel line is closed, a pressure builds up in front of this valve, through which the pressure accumulator is charged. When the first valve is open, the fuel is supplied to the nozzle in an amount that is dependent on the pump speed. In order to avoid excessive pressure rise at the pump outlet when the first valve is closed, the return branch is provided, which is bridged by the second valve.

Der Druckspeicher und das zweite Ventil können als gemeinsame Baugruppe ausgeführt sein, wobei das zweite Ventil gleichzeitig die Funktion des Druckspeichers übernimmt. Zu diesem Zweck ist vorgesehen, daß das zweite Ventil einen federgespannten Kolben aufweist, der in einem Zylinder bewegbar ist und zusammen mit diesem den Druckspeicher bildet, und daß der Zylinder eine mit dem Pumpeneinlaß verbundene Öffnung aufweist, die mit dem Pumpenauslaß verbunden wird, wenn der Druck am Pumpenauslaß den Kolben über die Öffnung hinweg zurückdrängt.The pressure accumulator and the second valve can be designed as a common assembly, the second valve simultaneously taking over the function of the pressure accumulator. For this purpose, it is provided that the second valve has a spring-loaded piston which is movable in a cylinder and together with this forms the pressure accumulator, and that the cylinder has an opening which is connected to the pump inlet and which is connected to the pump outlet when the Pressure at the pump outlet pushes the piston back over the opening.

Im folgenden werden unter Bezugnahme auf die Zeichnung Ausführungsbeispiele der Erfindung näher erläutert.Exemplary embodiments of the invention are explained in more detail below with reference to the drawing.

Es zeigen :

  • Fig. 1 eine schematische Darstellung einer ersten Ausführungsform des Brenners mit Gasdruckspeicher und
  • Fig. 2 eine schematische Darstellung einer zweiten Ausführungsform mit federgespanntem Druckspeicher.
Show it :
  • Fig. 1 is a schematic representation of a first embodiment of the burner with gas pressure accumulator and
  • Fig. 2 is a schematic representation of a second embodiment with spring-loaded pressure accumulator.

Bei dem Ausführungsbeispiel der Fig. 1 führt eine Brennstoffleitung 10 von einer Verdrängerpumpe 11 zu der Düse 12. Die Düse 12 ist mit einem Mantel 13 umgeben, der an einen Luftkanal 14 angeschlossen ist und in der Nähe der Düse- nöffnung - einen Auslaß 15 aufweist. Der aus der Düsenöffnung austretende Brennstoff vermischt sich mit der aus dem Auslaß 15 austretenden Luft. Eine Elektrodenanordnung 16 dient zur Erzeugung eines Lichtbogens zum Zünden der Flamme. Die Brennstoffleitung 10 enthält ein Ventil 17, das als Schaltventil ausgebildet ist und von einer Steuerung 18 eine vorgegebene Zeit lang geöffnet werden kann. Ferner ist im Strömungsweg vor dem Ventil 17 an die Brennstoffleitung 10 der Druckspeicher 19 in Form eines Gasdruckspeichers angeschlossen. Der Gasdruckspeicher enthält ein Gasvolumen 20, das von der Brennstoffleitung 10 durch eine flexible und dehnbare Membran 21 oder einen frei bewegbaren Kolben abgeschlossen ist.In the exemplary embodiment in FIG. 1, a fuel line 10 leads from a positive displacement pump 11 to the nozzle 12. The nozzle 12 is surrounded by a jacket 13 which is connected to an air duct 14 is connected and has an outlet 15 in the vicinity of the nozzle opening. The fuel emerging from the nozzle opening mixes with the air emerging from the outlet 15. An electrode arrangement 16 is used to generate an arc for igniting the flame. The fuel line 10 contains a valve 17 which is designed as a switching valve and can be opened by a controller 18 for a predetermined time. Furthermore, the pressure accumulator 19 in the form of a gas pressure accumulator is connected to the fuel line 10 in the flow path upstream of the valve 17. The gas pressure accumulator contains a gas volume 20, which is closed off from the fuel line 10 by a flexible and stretchable membrane 21 or a freely movable piston.

Vom Pumpenauslaß 11 führt der Rücklaufzweig 22 zum Pumpeneinlaß 11 a. Der Rücklaufzweig 22 enthält ein federgespanntes Rückschlagventil 23, das nur vom Pumpenauslaß 11 zum Pumpeneinlaß 11a öffnet, wenn der Druck am Pumpenauslaß einen vorgegebenen Schwellenwert übersteigt. Der Öffnungsdruck des Rückschlagventils 23 ist so bemessen, daß das Rückschlagventil öffnet, wenn der Druckspeicher 19 seine maximale Flüssigkeitsmenge aufgenommen hat. Auf diese Weise wird eine Überlastung der Brennstoffleitung 10, des Druckspeichers 19 und des Ventils 17 vermieden.The return branch 22 leads from the pump outlet 11 to the pump inlet 11 a. The return branch 22 contains a spring-loaded check valve 23 which only opens from the pump outlet 11 to the pump inlet 11a when the pressure at the pump outlet exceeds a predetermined threshold value. The opening pressure of the check valve 23 is dimensioned such that the check valve opens when the pressure accumulator 19 has received its maximum amount of liquid. In this way, an overload of the fuel line 10, the pressure accumulator 19 and the valve 17 is avoided.

Zum Zünden der Flamme wird das Ventil 17 geschlossen, so daß die Pumpe 11 Brennstoff von der Zuführleitung 24 zur Brennstoffleitung 10 fördert und hierbei der Druckspeicher aufgeladen wird. Nachdem der Druckspeicher 19 aufgeladen ist, wird das Ventil 17 schlagartig geöffnet, so daß der Druckspeicher 19 sich in die Brennstoffleitung 10 hinein zur Düse 12 entlädt und zusätzlich zu dem Fördervolumen der Pumpe 11 kurzfristig ein weiteres Brennstoffvolumen zur Verfügung stellt. Während die Luftmenge, die dem Einlaß 14 des Mantels 13 zugeführt wird, konstant bleibt, erhöht sich die Brennstoffmenge vorübergehend, so daß ein angefettetes Gemisch in den Brennraum einströmt, welches durch die Elektrodenanordnung 16 leicht gezündet werden kann.To ignite the flame, the valve 17 is closed so that the pump 11 conveys fuel from the supply line 24 to the fuel line 10 and the pressure accumulator is charged. After the pressure accumulator 19 is charged, the valve 17 is opened abruptly, so that the pressure accumulator 19 discharges into the fuel line 10 to the nozzle 12 and, in addition to the delivery volume of the pump 11, provides a further fuel volume for a short time. While the amount of air that is supplied to the inlet 14 of the jacket 13 remains constant, the amount of fuel increases temporarily, so that an enriched mixture flows into the combustion chamber, which can be easily ignited by the electrode arrangement 16.

Das Ausführungsbeispiel der Fig. 2 gleicht weitgehend demjenigen der Fig. 1, so daß die nachfolgende Beschreibung sich auf die Erläuterungen der Unterschiede beschränkt. Gemäß Fig. 2 enthält der Druckspeicher 19 eine Feder 25, die einen im Rücklaufzweig 22 angeordneten Kolben 26, welcher in einem Zylinder 27 bewegbar ist, in Richtung auf die Brennstoffleitung 10 drückt. Der Zylinder 27 weist eine seitliche Öffnung 28 auf, über die der Kolben 26 durch den Druck der Brennstoffleitung 10 hinweggedrängt werden kann, so daß der Rücklaufzweig 22 geöffnet und der Pumpenauslaß 11 mit dem Pumpeneinlaß 11a verbunden wird. Die Feder 25 drückt den Kolben 26 gegen einen Anschlag 29. Da der Kolben 26 abdichtend an der Wand des Zylinders 27 anliegt, kann bei entlasteter Feder 25 kein Brennstoff vom Pumpeneinlaß 11 a über den Rücklaufzweig 22 zum Pumpenauslaß 11b fließen. Der Druckspeicher 19 übernimmt daher zusätzlich die Funktion des Rückschlagventils 23 in Fig. 1.The embodiment of FIG. 2 is largely the same as that of FIG. 1, so that the following description is limited to the explanation of the differences. 2, the pressure accumulator 19 contains a spring 25, which presses a piston 26, which is arranged in the return branch 22 and can be moved in a cylinder 27, in the direction of the fuel line 10. The cylinder 27 has a lateral opening 28 through which the piston 26 can be pushed away by the pressure of the fuel line 10, so that the return branch 22 is opened and the pump outlet 11 is connected to the pump inlet 11a. The spring 25 presses the piston 26 against a stop 29. Since the piston 26 lies sealingly against the wall of the cylinder 27, no fuel can flow from the pump inlet 11a via the return branch 22 to the pump outlet 11b when the spring 25 is unloaded. The pressure accumulator 19 therefore also assumes the function of the check valve 23 in FIG. 1.

Die Feder 25 ist an dem kolbenartigen Abstützorgan 30 abgestützt, das mit einem Gewindebolzen 31 in ein Gewinde in der Stirnwand 32 des Zylinders 27 eingreift.The spring 25 is supported on the piston-like support member 30 which engages with a threaded bolt 31 in a thread in the end wall 32 of the cylinder 27.

Durch axiales Verstellen des Stützorgans 31 kann die Vorspannung der Feder 25 verändert werden.By axially adjusting the support member 31, the bias of the spring 25 can be changed.

Wenn bei der Einrichtung in Fig. 2 das Zünden erfolgen soll, wird das Ventil 17 abgesperrt. Durch den Betrieb der Verdrängerpumpe 11 erhöht sich der Druck in der Brennstoffleitung 10, wodurch der Druckspeicher 19 aufgeladen wird, d. h. der Kolben 26 wird entgegen der Kraft der Feder 25 von dem Anschlag abgedrängt. Übersteigt der Druck den durch die axiale Stellung des Stützorgans 30 vorgegebenen Schwellenwert, dann wird der Rücklaufzweig 22 durch Zurückweichen des Kolbens 26 geöffnet und die Pumpe 11 fördert in geschlossenem Kreislauf. Wenn das Ventil 17 geöffnet wird, drückt die Feder 25 durch den Kolben 26 die in dem Druckspeicher gespeicherte Flüssigkeitsmenge durch die Brennstoffleitung 10 zur Düse 12.If the ignition in the device in FIG. 2 is to take place, the valve 17 is shut off. The operation of the displacement pump 11 increases the pressure in the fuel line 10, as a result of which the pressure accumulator 19 is charged, ie. H. the piston 26 is pushed against the force of the spring 25 from the stop. If the pressure exceeds the threshold value predetermined by the axial position of the support member 30, then the return branch 22 is opened by retracting the piston 26 and the pump 11 delivers in a closed circuit. When the valve 17 is opened, the spring 25 pushes through the piston 26 the amount of liquid stored in the pressure accumulator through the fuel line 10 to the nozzle 12.

Bei beiden Ausführungsbeispielen wird die von dem Druckspeicher 19 aufzunehmende Flüssigkeitsmenge durch Öffnung des Rücklaufzweiges 22 begrenzt.In both exemplary embodiments, the amount of liquid to be taken up by the pressure accumulator 19 is limited by opening the return branch 22.

Claims (5)

1. Method for controlling the valve (17) of a liquid fuel burner, the burner being provided with a fuel conduit (10) leading from a pump (11) to a nozzle (12), which fuel conduit (10) includes the valve (17) and, in the flow path upstream of the valve (17), has a pressure store (19) connected thereto, characterized in that the valve (17) is controlled in such a manner that the pressure store (19), prior to ignition of the flame and while the valve (17) is in the closed state, is filled with fuel and, after the opening of the valve (17) and under operation of the pump (11), is discharged towards the nozzle (12).
2. Liquid fuel burner for carrying out the method of claim 1, having a fuel conduit (10) leading from a pump (11) to a nozzle (12), which fuel conduit (10) includes a controlled valve (17) and, in the flow path upstream of the valve (17), has a pressure store (19) connected thereto, characterized in that the pressure store (19) is a pressure gas store.
3. Burner according to claim 2, characterized in that the pump (11) is a displacement pump which is bridged by a return branch (22) containing a pressure-responsive second valve (23 ; 25, 26).
4. Burner according to claim 3, characterized in that the second valve (25, 26) is provided with a spring-biased piston (26) being movable within a cylinder (27) and forming the pressure store (19) therewith, and in that the cylinder (27) is provided with an opening (28) connected to the pump inlet (11a), which opening (28) is connected to the pump outlet (11b) when the pressure at the pump outlet urges the piston (26) back beyond the opening (28).
5. Burner according to claim 4, characterized in that the spring (25) is supported by an adjustable support member (30).
EP19860117396 1986-01-11 1986-12-13 Combustion method and liquid fuel burner Expired - Lifetime EP0233349B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863600597 DE3600597A1 (en) 1986-01-11 1986-01-11 BURNER FOR LIQUID FUELS
DE3600597 1986-01-11

Publications (2)

Publication Number Publication Date
EP0233349A1 EP0233349A1 (en) 1987-08-26
EP0233349B1 true EP0233349B1 (en) 1990-03-07

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ID=6291665

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Application Number Title Priority Date Filing Date
EP19860117396 Expired - Lifetime EP0233349B1 (en) 1986-01-11 1986-12-13 Combustion method and liquid fuel burner

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EP (1) EP0233349B1 (en)
DE (1) DE3600597A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3800300C3 (en) * 1988-01-08 1998-04-30 Schaefer Stettiner Schrauben Oil supply device for an oil atomizing burner
DE3814530C1 (en) * 1988-04-29 1989-11-16 Danfoss A/S, Nordborg, Dk
JP3055365B2 (en) † 1993-06-30 2000-06-26 東洋インキ製造株式会社 Process for producing dialkyl 2,5-di (arylamino) -3,6-dihydroterephthalate and process for producing quinacridone using the same as an intermediate
FR2697131B1 (en) * 1993-08-02 1995-03-31 Bap Installation to protect frost-resistant cultures against lowering of ambient temperature.
DE19724502C1 (en) * 1997-06-11 1998-10-08 Webasto Thermosysteme Gmbh Auxiliary heating device for motor vehicle
DE102012110103A1 (en) * 2012-10-23 2014-04-24 Spheros Gmbh Liquid fuel heater

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Publication number Priority date Publication date Assignee Title
US1701191A (en) * 1927-05-25 1929-02-05 William R Ray Automatic oil feeding and starting valve
CH345289A (en) * 1956-11-24 1960-03-15 Leisenberg Manfred Fuel injector for kilns
DE1401774A1 (en) * 1962-03-20 1968-10-10 Danfoss As Method and device for removing the fluid from the outlet line of a pressurized fluid conveying system located behind the shut-off valve
DE1269277B (en) * 1963-01-19 1968-05-30 Ludwig Bluecher Conveyor unit for heating oil pressure supply systems
DE1551671A1 (en) * 1966-03-30 1970-03-19 Kurt Hastenteufel Line system for oil heating with single-line oil supply
GB1312961A (en) * 1970-01-13 1973-04-11 Shell Mex Bp Ltd Method and apparatus for burning liquefied petroleum gas
DE3103684C2 (en) * 1981-01-31 1986-08-07 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Oil burner
US4416592A (en) * 1981-04-15 1983-11-22 Sid Harvey, Inc. Liquid flow control apparatus

Also Published As

Publication number Publication date
EP0233349A1 (en) 1987-08-26
DE3600597C2 (en) 1988-11-24
DE3600597A1 (en) 1987-07-16

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