EP2863120B1 - Fuel-Air Mixing Device - Google Patents

Fuel-Air Mixing Device Download PDF

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Publication number
EP2863120B1
EP2863120B1 EP14186733.3A EP14186733A EP2863120B1 EP 2863120 B1 EP2863120 B1 EP 2863120B1 EP 14186733 A EP14186733 A EP 14186733A EP 2863120 B1 EP2863120 B1 EP 2863120B1
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EP
European Patent Office
Prior art keywords
fuel
opening
mixing device
air mixing
air
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EP14186733.3A
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German (de)
French (fr)
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EP2863120A1 (en
Inventor
Franz Schmuker
Albrecht Schaefer
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/007—Regulating fuel supply using mechanical means

Definitions

  • the invention relates to a fuel-air mixing device in which a preferably gaseous fuel is fed into the flowing air in the area of a constriction via at least one opening. Furthermore, the invention relates to a heater with a fan-assisted burner with such a fuel-air mixing device.
  • the DE 102010044591 A1 shows and describes a fuel-air mixing device in the form of a venturi passage, in which air is forced into the venturi inlet via a fan in order to be mixed with gas shortly after the venturi throat.
  • the gas is supplied via a gas regulator and a short supply line, in which the gas flow is influenced and throttled both in terms of pressure and flow. Heaters with such an arrangement are too limited in their ability to vary the power for today's needs.
  • a fuel-air mixing device with the features of the preamble of claim 1 is from US3799195 known.
  • the fuel-air mixing device has an air inlet, a constriction and at least one opening in the area of the constriction for supplying fuel, in which the opening is designed to be adjustable.
  • a locking device is provided for locking the adjustable opening.
  • the fuel/air mixing device has a locking screw.
  • Such a fuel-air mixing device has the advantage that it maintains a preset fuel-air mixture over a wide power range can hold. This is particularly advantageous for heaters that have a fan that can be modulated in terms of output, which then works together with the fuel/air mixing device according to the invention.
  • the fan can be arranged in front of the fuel-air mixing device or, more advantageously, in the direction of flow after it.
  • the locking device according to the invention has a locking screw. This is preferably attached in such a way that it does not force the opening in one direction during and after the fixing.
  • the locking device can be closed, in particular can be sealed.
  • sealable is meant that after adjustment, a seal that can only be removed by destruction can be attached.
  • the closability can be achieved in that the locking screw has a protective cap.
  • the protective cap is preferably designed in such a way that, after it has been applied, it or parts thereof can only be removed again by destroying it. Subsequent manipulation can thus be detected.
  • the locking device has a locking element, a simple, self-locking locking can be achieved.
  • the latching element can be designed in such a way that the lock can only be opened by destroying the latching element or a wall covering the latching element.
  • a locking device that is also particularly simple and can be used multiple times can be created by providing a folding element.
  • a folding element can engage in a detent and effectively prevent the opening from being adjusted.
  • the hinged element has a through-hole that is aligned with a through-hole of a fixed element, the hinged element can be secured or sealed.
  • the opening is designed as an annular gap.
  • the width of this annular gap can be varied and the size of the opening can thus be adjusted.
  • the supply conditions of the fuel in the area of the constriction improve when the opening is an annular gap. The supply of fuel thus stabilizes the flow conditions over the entire circumference of the fuel/air mixing device, which is designed as a venturi.
  • the opening is formed between a base body and a sleeve. If the sleeve is then movable relative to the base body, the size of the opening can be varied in this way.
  • the pressure level can be adjusted very easily if a pressure control valve is provided.
  • the heating device according to the invention with a fuel-air mixing device according to the invention has the advantage that manufacturing tolerances can be compensated for because the opening is adjustable.
  • the orifice can be adjusted extremely precisely so that the main throttling of the fuel after the pressure adjustment can take place at this orifice.
  • different types of fuel can be supplied and the mixing ratios can be optimized by adjusting the opening. Age-related changes in the geometric or aerodynamic conditions can also be easily compensated.
  • the opening represents the essential throttling of the fuel between the line and the admixture to the air, as a result of which the power modulation can be significantly increased.
  • the essential pressure drop for the fuel takes place. It has been shown that this measure at the constriction through this fuel introduction achieves a flow through which the fuel-air mixture can be metered very precisely, because the fuel is introduced at high speed, which stabilizes the flow in the Venturi and optimally utilizes the negative pressure conditions in the area of the Venturi constriction.
  • the result of this is that the fuel-air ratio remains constant over a wide modulation range even with fan power modulation. This is an advantage in particular when the output of heating devices has to be varied over a large modulation range, for example because well-insulated houses should have a low output value for heating but a high output value for domestic water heating.
  • the fuel can be supplied via a very short line or via a line routed through the heater. It is advantageous if the main throttling of the fuel takes place at the opening in the area of the constriction of the venturi and not earlier.
  • the fuel control valve usually provided in the fuel supply line also throttles the passage of fuel.
  • the main task of this valve is to provide the fuel with a (pre)determinable pressure, generally equal or essentially equal to the ambient pressure, and not to restrict the fuel for fuel metering.
  • Significant throttling should therefore be understood to mean that from the point at which the fuel is made available at a predeterminable pressure, there is no greater throttling than at the opening.
  • a heater 10 is shown schematically, which has a blower 12, a burner 14 and a fuel-air mixing device 16.
  • the fuel-air mixing device 16 is shown schematically in FIG figure 2 shown, in which it can be seen that in the area of a constriction 18 inflowing air 20 (shown by an arrow) fuel 22 (also shown by an arrow) is supplied via an opening 24 .
  • FIG 1 further assemblies of the heater 10 according to the invention are shown.
  • the fuel 22 is supplied via a fuel line 26 and a fuel control valve 28 via a line 30 to the fuel-air mixing device 16 .
  • the fuel control valve 28 is constructed to regulate the fuel to a value proportional to, equal to, or substantially equal to ambient pressure, regardless of its inlet pressure.
  • the line 30 is shown here as a separate line. However, it can also, in particular if the fuel control valve 28 is connected directly to the fuel/air mixing device 16 (as in figure 3 shown in phantom) be designed as an internal passage.
  • the fuel 22 is mixed with the inflowing air 20, sucked in by the fan 12 and fed to the burner 14 via a feed hood 32.
  • a heat exchanger 34 is arranged below the burner 14 designed as a downdraft burner, to which a supply line 36 and a return line 38 for heating water are connected.
  • the hot exhaust gas flows through the heat exchanger 34 , cools it and feeds it to an exhaust gas line 40 which opens into an exhaust gas outlet 42 .
  • a controller 44 and an expansion tank 46 are also housed.
  • other assemblies such as an additional service water heat exchanger or various pumps and mixers, can also be provided.
  • FIG 2 the functioning of the heater 10 according to the invention is shown.
  • the blower 12 sucks in a fuel-air mixture via the fuel-air mixing device 16 according to the invention and conveys this to the burner 14, on the underside of which a flame 50, monitored by a flame monitoring device 48, burns.
  • the fuel-air mixing device 16 according to the invention has the form of a Venturi tube, at the inlet 52 of which ambient air is sucked in and accelerated up to the constriction 18 .
  • the fuel 22 is made available in a fuel chamber 54 under a defined pressure in order to then be sucked in through the annular opening 24 essentially in the direction of flow.
  • the Venturi effect helps here, according to which the suction of the fuel is promoted by the fast-flowing air.
  • the pressure conditions are adjusted in such a way that the ambient pressure of the supplied air 20 and the pressure of the fuel 22 in the fuel chamber 54 are almost the same and the correct mixing ratio takes place when they are brought together in the constriction 18 . Because the introduction of the gaseous fuel essentially corresponds in direction and speed to the air flow and takes place along the area surrounding the Venturi tube, which widens again after the constriction, a significantly improved flow in the diffuser is achieved compared to the prior art. As a result, the blower 12 can be modulated in a wide modulation range and the output power of the heater 10 according to the invention can be influenced.
  • the fuel-air mixing device 16 according to the invention is shown in more detail. It can be seen that the opening 24 is ring-shaped at the constriction 18 and fuel 22 can flow from the fuel chamber 54 into the venturi arrangement. It can be seen that the fuel 22 can be supplied starting from the opening 24 along the path 56 in the flow direction of the inflowing air 20 .
  • the fuel 22 flows along an inner wall 58 of the fuel-air mixing device 16.
  • mixing between the fuel 22 and air 20 begins, which is then completed in the fan 12 to form a homogeneous mixture.
  • the opening 24 is formed between an extension of the inner wall 58 and a tube section 60 of the inlet 52.
  • the special design is such that the tube section 60 can be displaced relative to the inner wall 58 and the opening 24 is thus designed to be adjustable in size .
  • the pipe section 60 is part of a sleeve 62 which in turn interacts with a base body 64 of the fuel/air mixing device 16 .
  • the inner wall 58, tubular section 60, sleeve 62 and body 64 enclose the fuel chamber 54 therein.
  • a connection 66 for connecting the line 30 for supplying the fuel 22 is integrally formed on the base body 64 .
  • the base body 64 and the sleeve 62 are connected to one another via a thread 68 . This makes it possible, by rotating the sleeve 62 relative to the base body 64, to achieve an axial displacement of the sleeve 62 relative to the base body 64 and to adjust the size of the opening 24.
  • a continuation 69 of the sleeve 62 beyond the thread 68 one or more seals or sealing chambers 70 are provided, which seal off the fuel chamber 54 from the outside.
  • the opening 24 could be adjusted by sliding the sleeve 62 relative to the body 64.
  • a locking device 72 is shown schematically.
  • the locking device 72 acts between the base body 64 and the sleeve 62. It prevents the size of the opening 24, once it has been set, from being changed again. In the exemplary embodiment, this is done by preventing the sleeve 62 from twisting against the base body 64 . Should the sleeve 62 affect the size of the opening 24 by shifting, the detent 72 would be configured to prevent shifting.
  • FIG 5 a first embodiment of a locking device 72 in the form of a locking screw 74 is shown.
  • a collar 76 formed on the sleeve 62 is clamped with respect to the base body 64 by means of the screw head 78 via this locking screw 74 .
  • a sliding body 80 is arranged in the base body 64 and has a polygonal outer profile, via which it is arranged to be displaceable in an inner profile of the same shape. In this way, when the locking screw 74 is tightened, the sliding body 80 rests against the collar 74 without tension. This has the advantage that no external forces act on the parts forming the opening 24 and the opening 24 can also be kept constant over a longer period of time. This type of locking also has the advantage that the opening 24 can be continuously adjusted.
  • the screw head 78 is provided with a metal protective cap 82 into which a cup-shaped closure part 84 can be pressed.
  • the closure part 84 which is preferably made of plastic, is wedged in the protective cap 82 and can only be removed by destroying it. In this way, effective protection against manipulation is provided.
  • a latching element 86 is provided there, which latches into an opening 90 made in a collar 88 of the base body 64 .
  • the latching element 86 is formed on a latching clip 92 which, in the drawing, can be pushed onto the collar 88 from above, so that the latching element 86 deflects and latches into the opening 90 when pressed further.
  • an extension 94 is pressed onto an encircling collar 96 which is integrally formed on the sleeve 62 .
  • the collar 96 has recesses 98 into which the walls 100 of the extension 94 engage and prevent the sleeve 62 from rotating further relative to the base body 64 . In this way it is ensured that when the locking clip 92 is pressed on there are no tensions between the sleeve 62 and the base body 64 which could possibly influence the size of the opening 24 .
  • the latching clip 92 is designed in such a way that the latching element 86 can only be moved out of the opening 90 by a thin wall attached to the latching clip 92 102 is pierced. As a result, manipulation, if it takes place, can be identified retrospectively.
  • a third embodiment having a folding element 104 is shown in figure 7 shown.
  • the folding element 104 has a bracket 106 which is L-shaped in side view and U-shaped in cross section and which is articulated on a first block 108 formed on the base element. As a result, the bracket 106 can be given away or folded in the direction of a peripheral collar 110 formed on the sleeve 62 .
  • the peripheral collar 110 has a plurality of grooves 112 into which the walls of the U-shaped bracket 106 can engage. This prevents the sleeve 62 from twisting relative to the base body 64 and the size of the adjusted opening 24 is locked.
  • a second block 112 is formed on the base body 64 and has a through-opening 114 which is aligned with a through-opening 116 on the bracket 106 in the locked position.
  • the wire of a seal for example, can be threaded through this opening structure and secured. The folding element 104 is thus secured against manipulation.

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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)
  • Feeding And Controlling Fuel (AREA)

Description

Die Erfindung betrifft eine Brennstoff-Luft-Mischeinrichtung bei der ein vorzugsweise gasförmiger Brennstoff in die strömende Luft im Bereich einer Engstelle über mindestens eine Öffnung zugeführt wird. Weiter betrifft die Erfindung ein Heizgerät mit einem von einem Gebläse unterstützten Brennermit einer solchen Brennstoff-Luft-Mischeinrichtung.The invention relates to a fuel-air mixing device in which a preferably gaseous fuel is fed into the flowing air in the area of a constriction via at least one opening. Furthermore, the invention relates to a heater with a fan-assisted burner with such a fuel-air mixing device.

Stand der TechnikState of the art

Die DE 102010044591 A1 zeigt und beschreibt eine Brennstoff-Luft-Mischeinrichtung in der Form einer Venturi-Durchführung, bei der Luft über ein Gebläse in den Venturi-Einlass gepresst wird, um kurz nach der Venturi-Engstelle mit Gas vermischt zu werden. Die Gaszufuhr erfolgt über ein Gasregelgerät und eine kurze Zuleitung, in denen die Gasströmung sowohl im Druck wie auch in ihrer Strömung beeinflusst und gedrosselt werden. Heizgeräte mit einer solchen Anordnung sind in ihrer Möglichkeit, die Leistung zu variieren, für heutige Wünsche zu stark begrenzt. Eine Brennstoff-Luft-Mischeinrichtung mit den Merkmalen des Oberbegriffs des Anspruchs 1 ist aus dem US 3799195 bekannt.The DE 102010044591 A1 shows and describes a fuel-air mixing device in the form of a venturi passage, in which air is forced into the venturi inlet via a fan in order to be mixed with gas shortly after the venturi throat. The gas is supplied via a gas regulator and a short supply line, in which the gas flow is influenced and throttled both in terms of pressure and flow. Heaters with such an arrangement are too limited in their ability to vary the power for today's needs. A fuel-air mixing device with the features of the preamble of claim 1 is from US3799195 known.

Offenbarung der ErfindungDisclosure of Invention VorteileAdvantages

Die erfindungsgemäße Brennstoff-Luft-Mischeinrichtung weist einem Lufteinlass, eine Engstelle und mindestens eine Öffnung im Bereich der Engstelle zum Zuführen von Brennstoff auf, bei der die Öffnung einstellbar ausgebildet ist. Es ist eine Arretiervorrichtung zum Arretieren der einstellbaren Öffnung vorgesehen. Erfindungsgemäß weist die Brennstoff-Luft-Mischeinrichtung eine Feststellschraube auf. Eine solche Brennstoff-Luft-Mischeinrichtung weist den Vorteil auf, dass sie ein voreingestelltes Brennstoff-Luft-Gemisch über einen weiten Leistungsbereich konstant halten kann. Dies ist insbesondere für Heizgeräte von Vorteil, die ein in der Leistung modulierbares Gebläse aufweisen, das dann mit der erfindungsgemäßen Brennstoff-Luft-Mischeinrichtung zusammen arbeitet. Das Gebläse kann vor der Brennstoff-Luft-Mischeinrichtung oder vorteilhafter in Strömungsrichtung danach angeordnet sein.The fuel-air mixing device according to the invention has an air inlet, a constriction and at least one opening in the area of the constriction for supplying fuel, in which the opening is designed to be adjustable. A locking device is provided for locking the adjustable opening. According to the invention, the fuel/air mixing device has a locking screw. Such a fuel-air mixing device has the advantage that it maintains a preset fuel-air mixture over a wide power range can hold. This is particularly advantageous for heaters that have a fan that can be modulated in terms of output, which then works together with the fuel/air mixing device according to the invention. The fan can be arranged in front of the fuel-air mixing device or, more advantageously, in the direction of flow after it.

Es ist von Vorteil, dass die einmal eingestellte Öffnung mit der Arretiervorrichtung arretiert werden kann. Dies kann direkt nach dem Zusammenbau im Werk erfolgen oder aber vor Ort, wenn das Heizgerät aufgestellt wird.It is advantageous that once the opening has been set, it can be locked with the locking device. This can be done immediately after assembly at the factory or on site when the heater is set up.

Die erfindungsgemäße Arretiereinrichtung weist eine Feststellschraube auf. Diese ist bevorzugt so angebracht, dass sie während und nach dem Feststellen die Öffnung nicht in eine Richtung drängt.The locking device according to the invention has a locking screw. This is preferably attached in such a way that it does not force the opening in one direction during and after the fixing.

Durch die in den Unteransprüchen aufgeführten Merkmale sind vorteilhafte Weiterbildungen des Heizgerätes nach dem Hauptanspruch möglich.Advantageous developments of the heater according to the main claim are possible due to the features listed in the subclaims.

Nach dem Einstellen kann es notwendig werden, die Einstellung dauerhaft vor Veränderung und Manipulation zu schützen. In diesem Fall ist es von Vorteil, wenn die Arretiereinrichtung verschließbar, insbesondere plombierbar ist. Unter plombierbar ist zu verstehen, dass nach der Einstellung ein nur durch Zerstörung entfernbarer Verschluss angebracht werden kann.After setting, it may be necessary to permanently protect the setting against modification and manipulation. In this case it is advantageous if the locking device can be closed, in particular can be sealed. By sealable is meant that after adjustment, a seal that can only be removed by destruction can be attached.

Die Verschließbarkeit kann dadurch erreicht werden, dass die Feststellschraube eine Schutzkappe aufweist. Die Schutzkappe ist bevorzugt so ausgestaltet, dass sie oder Teile davon nach dem Aufbringen nur durch Zerstörung wieder abgenommen werden können. Somit kann eine nachträgliche Manipulation festgestellt werden.The closability can be achieved in that the locking screw has a protective cap. The protective cap is preferably designed in such a way that, after it has been applied, it or parts thereof can only be removed again by destroying it. Subsequent manipulation can thus be detected.

Weist die Arretiereinrichtung ein Rastelement auf, lässt sich eine einfache, selbstsichernde Arretierung erreichen. Das Rastelement kann so ausgestaltet sein, dass die Arretierung nur durch Zerstörung des Rastelements oder einer das Rastelement abdeckenden Wand geöffnet werden kann.If the locking device has a locking element, a simple, self-locking locking can be achieved. The latching element can be designed in such a way that the lock can only be opened by destroying the latching element or a wall covering the latching element.

Eine ebenfalls besonders einfache und mehrfach nutzbare Arretiereinrichtung kann dadurch geschaffen werden, dass ein Klappelement vorgesehen ist. Ein solches Klappelement kann in eine Rasterung eingreifen und ein Verstellen der Öffnung wirksam verhindern.A locking device that is also particularly simple and can be used multiple times can be created by providing a folding element. Such a folding element can engage in a detent and effectively prevent the opening from being adjusted.

Weist das Klappelement eine Durchgangsbohrung auf, die mit einer Durchgangsbohrung eines feststehenden Elements fluchtet, kann das Klappelement gesichert oder plombiert werden.If the hinged element has a through-hole that is aligned with a through-hole of a fixed element, the hinged element can be secured or sealed.

In einer besonderen Ausführung ist die Öffnung als ringförmiger Spalt ausgebildet. Dieser ringförmige Spalt lässt sich in seiner Weite variieren und so kann die Größe der Öffnung eingestellt werden. Außerdem verbessern sich die Zuführungsverhältnisse des Brennstoffs im Bereich der Engstelle, wenn die Öffnung ein ringförmiger Spalt ist. Die Zufuhr des Brennstoffs stabilisiert dadurch die Strömungsverhältnisse auf dem ganzen Umfang der als Venturi ausgebildeten Brennstoff-Luft-Mischeinrichtung.In a special embodiment, the opening is designed as an annular gap. The width of this annular gap can be varied and the size of the opening can thus be adjusted. In addition, the supply conditions of the fuel in the area of the constriction improve when the opening is an annular gap. The supply of fuel thus stabilizes the flow conditions over the entire circumference of the fuel/air mixing device, which is designed as a venturi.

In einer besonders einfachen, konstruktiven Ausführung ist die Öffnung zwischen einem Grundkörper und einer Muffe gebildet. Ist die Muffe dann relativ zum Grundkörper bewegbar, kann auf diese Weise die Größe der Öffnung variiert werden.In a particularly simple structural design, the opening is formed between a base body and a sleeve. If the sleeve is then movable relative to the base body, the size of the opening can be varied in this way.

Besonders einfach gelingt die Variation der Öffnung dann, wenn die Muffe und der Grundkörper über ein Gewinde miteinander verbunden sind.It is particularly easy to vary the opening when the sleeve and the base body are connected to one another via a thread.

Sehr einfach lässt sich das Druckniveau einstellen, wenn ein Druckregelventil vorgesehen ist.The pressure level can be adjusted very easily if a pressure control valve is provided.

Das erfindungsgemäße Heizgerät mit einer erfindungsgemäßen Brennstoff-Luft-Mischeinrichtung hat den Vorteil, dass dadurch, dass die Öffnung einstellbar ist, Fertigungstoleranzen ausgeglichen werden können. Die Öffnung lässt sich äußerst präzise einstellen, so dass die hauptsächliche Drosselung des Brennstoffs nach der Druckanpassung an dieser Öffnung stattfinden kann. Ferner können unterschiedliche Brennstoffarten zugeführt und über die Einstellung der Öffnung die Mischungsverhältnisse optimiert werden. Auch altersbedingte Änderungen an den geometrischen oder strömungstechnischen Verhältnissen lassen sich einfach ausgleichen.The heating device according to the invention with a fuel-air mixing device according to the invention has the advantage that manufacturing tolerances can be compensated for because the opening is adjustable. The orifice can be adjusted extremely precisely so that the main throttling of the fuel after the pressure adjustment can take place at this orifice. Furthermore, different types of fuel can be supplied and the mixing ratios can be optimized by adjusting the opening. Age-related changes in the geometric or aerodynamic conditions can also be easily compensated.

In der Leitung des Brennstoffs über das Druckregelventil zur Öffnung, stellt die Öffnung die wesentliche Drosselung des Brennstoffes zwischen der Leitung und der Zumischung zur Luft dar, wodurch die Leistungsmodulation deutlich gesteigert werden kann. An dieser Öffnung zwischen der durchströmenden Zuluft und dem Brennstoff-Einlass findet dann der wesentliche Druckabfall für den Brennstoff statt. Es hat sich gezeigt, dass durch diese Maßnahme an der Engstelle durch diese Brennstoff-Einleitung eine Strömung erreicht wird, durch die das Brennstoff-Luftgemisch sehr exakt dosiert werden kann, weil das Einleiten des Brennstoffs mit großer Geschwindigkeit erfolgt, was die Strömung im Venturi stabilisiert und die Unterdruckverhältnisse im Bereich der Venturi-Engstelle optimal ausnutzt. Daraus resultiert, dass auch bei einer Gebläseleistungsmodulation über einen weiten Modulationsbereich das Brennstoff-Luftverhältnis konstant bleibt. Dies ist insbesondere dann ein Vorteil, wenn Heizgeräte über einen großen Modulationsbereich in ihrer Leistung variiert werden müssen, beispielsweise weil zum einen gut gedämmte Häuser einen geringen Leistungswert für die Heizung jedoch einen hohen Leistungswert für die Brauchwasserbereitung aufweisen sollen.In the fuel line via the pressure control valve to the opening, the opening represents the essential throttling of the fuel between the line and the admixture to the air, as a result of which the power modulation can be significantly increased. At this opening between the incoming air flowing through and the fuel inlet then the essential pressure drop for the fuel takes place. It has been shown that this measure at the constriction through this fuel introduction achieves a flow through which the fuel-air mixture can be metered very precisely, because the fuel is introduced at high speed, which stabilizes the flow in the Venturi and optimally utilizes the negative pressure conditions in the area of the Venturi constriction. The result of this is that the fuel-air ratio remains constant over a wide modulation range even with fan power modulation. This is an advantage in particular when the output of heating devices has to be varied over a large modulation range, for example because well-insulated houses should have a low output value for heating but a high output value for domestic water heating.

Die Zufuhr des Brennstoffs kann wie im StdT über eine sehr kurze Leitung oder aber über eine durch das Heizgerät geführt Leitung erfolgen. Vorteilhaft ist es, wenn die Hauptdrosselung des Brennstoffs eben an der Öffnung im Bereich der Engstelle des Venturis stattfindet und nicht schon vorher.As in the StdT, the fuel can be supplied via a very short line or via a line routed through the heater. It is advantageous if the main throttling of the fuel takes place at the opening in the area of the constriction of the venturi and not earlier.

Das in der Brennstoffzufuhrleitung üblicherweise vorgesehene Brennstoffregelventil drosselt den Brennstoffdurchgang zwar ebenfalls. Hauptaufgabe diese Ventils ist aber, den Brennstoff mit einem (vor-)bestimmbaren Druck, in der Regel gleich oder im Wesentlichen gleich dem Umgebungsdruck, bereit zu stellen und nicht die Brennstoffdrosselung für die Brennstoffdosierung. Unter wesentlicher Drosselung soll deshalb verstanden werde, dass ab der Stelle, an der der Brennstoff mit einem vorbestimmbaren Druck bereit gestellt wird, keine stärkere Drosselung als an der Öffnung stattfindet.The fuel control valve usually provided in the fuel supply line also throttles the passage of fuel. However, the main task of this valve is to provide the fuel with a (pre)determinable pressure, generally equal or essentially equal to the ambient pressure, and not to restrict the fuel for fuel metering. Significant throttling should therefore be understood to mean that from the point at which the fuel is made available at a predeterminable pressure, there is no greater throttling than at the opening.

Zeichnungendrawings

In den Zeichnungen sind Ausführungsbeispiele des erfindungsgemäßen Heizgerätes und der erfindungsgemäßen Brennstoff-Luft-Mischeinrichtung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen

  • Figur 1 eine schematische Darstellung der Komponenten eines Heizgerätes,
  • Figur 2 eine schematische Darstellung der Funktionsweise des erfindungsgemäßen Heizgerätes,
  • Figur 3 einen Schnitt durch eine erfindungsgemäße Brennstoff-Luft-Mischeinrichtung,
  • Figur 4 einen Schnitt nach Linie IV-IV in Figur 3,
  • Figuren 5 bis 7 Varianten möglicher Arretiereinrichtungen und
  • Figur 8 einen Teilschnitt nach Linie VIII-VIII in Figur 7.
In the drawings, exemplary embodiments of the heater according to the invention and the fuel-air mixing device according to the invention are shown and explained in more detail in the following description. Show it
  • figure 1 a schematic representation of the components of a heater,
  • figure 2 a schematic representation of the functioning of the heater according to the invention,
  • figure 3 a section through a fuel-air mixing device according to the invention,
  • figure 4 a cut along line IV-IV in figure 3 ,
  • Figures 5 to 7 Variants of possible locking devices and
  • figure 8 a partial section along line VIII-VIII in figure 7 .

BeschreibungDescription

In Figur 1 ist schematisch ein Heizgerät 10 dargestellt, das ein Gebläse 12, einen Brenner 14 sowie eine Brennstoff-Luft-Mischeinrichtung 16 aufweist. Die Brennstoff-Luft-Mischeinrichtung 16 ist schematisch in Figur 2 dargestellt, in der zu erkennen ist, dass im Bereich einer Engstelle 18 einströmende Luft 20 (dargestellt durch einen Pfeil) Brennstoff 22 (ebenfalls dargestellt durch einen Pfeil) über eine Öffnung 24 zugeführt wird.In figure 1 a heater 10 is shown schematically, which has a blower 12, a burner 14 and a fuel-air mixing device 16. The fuel-air mixing device 16 is shown schematically in FIG figure 2 shown, in which it can be seen that in the area of a constriction 18 inflowing air 20 (shown by an arrow) fuel 22 (also shown by an arrow) is supplied via an opening 24 .

In Figur 1 sind weitere Baugruppen des erfindungsgemäßen Heizgerätes 10 dargestellt. So wird über eine Brennstoffleitung 26 und ein Brennstoffregelventil 28 der Brennstoff 22 über eine Leitung 30 der Brennstoff-Luft-Mischeinrichtung 16 zugeführt. Das Brennstoffregelventil 28 ist so aufgebaut, dass es den Brennstoff unabhängig von seinem Eingangsdruck auf einen dem Umgebungsdruck proportionalen, einen gleichen oder einen im Wesentlichen gleichen Wert regelt. Die Leitung 30 ist hier als separate Leitung dargestellt. Sie kann aber auch, insbesondere wenn das Brennstoffregelventil 28 direkt mit dem Brennstoff-Luft-Mischeinrichtung 16 verbunden ist (wie in Figur 3 strichpunktiert dargestellt), wie ein interner Durchlass ausgestaltet sein.In figure 1 further assemblies of the heater 10 according to the invention are shown. Thus, the fuel 22 is supplied via a fuel line 26 and a fuel control valve 28 via a line 30 to the fuel-air mixing device 16 . The fuel control valve 28 is constructed to regulate the fuel to a value proportional to, equal to, or substantially equal to ambient pressure, regardless of its inlet pressure. The line 30 is shown here as a separate line. However, it can also, in particular if the fuel control valve 28 is connected directly to the fuel/air mixing device 16 (as in figure 3 shown in phantom) be designed as an internal passage.

In der Brennstoff-Luft-Mischeinrichtung 16 wird der Brennstoff 22 mit der einströmenden Luft 20 vermischt, vom Gebläse 12 angesaugt und über eine Zuführhaube 32 dem Brenner 14 zugeführt. Unterhalb des als Fallstrom-Brenners ausgeführten Brenners 14 ist ein Wärmetauscher 34 angeordnet, an den eine Vorlaufleitung 36 und eine Rücklaufleitung 38 für Heizwasser angeschlossen sind. Der Wärmetauscher 34 wird vom heißen Abgas durchströmt, kühlt dieses ab und führt es einer Abgasleitung 40 zu, die in einen Abgasauslass 42 mündet.In the fuel-air mixing device 16, the fuel 22 is mixed with the inflowing air 20, sucked in by the fan 12 and fed to the burner 14 via a feed hood 32. A heat exchanger 34 is arranged below the burner 14 designed as a downdraft burner, to which a supply line 36 and a return line 38 for heating water are connected. The hot exhaust gas flows through the heat exchanger 34 , cools it and feeds it to an exhaust gas line 40 which opens into an exhaust gas outlet 42 .

Im Heizgerät 10 sind ferner eine Steuerung 44 sowie ein Ausdehnungsgefäß 46 untergebracht. Je nach Ausstattung des Heizgerätes 10 können darüber hinaus noch weitere Baugruppen, wie beispielsweise ein zusätzlicher Brauchwasserwärmetauscher oder diverse Pumpen und Mischer, vorgesehen sein.In the heater 10, a controller 44 and an expansion tank 46 are also housed. Depending on how the heating device 10 is equipped, other assemblies, such as an additional service water heat exchanger or various pumps and mixers, can also be provided.

In Figur 2 ist die Funktionsweise des erfindungsgemäßen Heizgerätes 10 dargestellt. Das Gebläse 12 saugt über die erfindungsgemäße Brennstoff-Luft-Mischeinrichtung 16 ein Brennstoff-Luft-Gemisch an und fördert dieses zum Brenner 14, an dessen Unterseite eine, von einer Flammenüberwachungseinrichtung 48 überwachte Flamme 50 brennt. Die erfindungsgemäße Brennstoff-Luft-Mischeinrichtung 16 weist die Form eines Venturi-Rohres auf, an dessen Einlass 52 Umgebungsluft angesaugt und bis zur Engstelle 18 beschleunigt wird. Im Bereich der Engstelle 18 wird der Brennstoff 22 in einer Brennstoffkammer 54 unter definierten Druck bereitgestellt, um dann durch die ringförmige Öffnung 24 im Wesentlichen in Strömungsrichtung angesaugt zu werden. Hier hilft der Venturi-Effekt, gemäß dem das Ansaugen des Brennstoffes durch die schnell fließende Luft begünstigt wird.In figure 2 the functioning of the heater 10 according to the invention is shown. The blower 12 sucks in a fuel-air mixture via the fuel-air mixing device 16 according to the invention and conveys this to the burner 14, on the underside of which a flame 50, monitored by a flame monitoring device 48, burns. The fuel-air mixing device 16 according to the invention has the form of a Venturi tube, at the inlet 52 of which ambient air is sucked in and accelerated up to the constriction 18 . In the region of the constriction 18, the fuel 22 is made available in a fuel chamber 54 under a defined pressure in order to then be sucked in through the annular opening 24 essentially in the direction of flow. The Venturi effect helps here, according to which the suction of the fuel is promoted by the fast-flowing air.

Die Druckverhältnisse sind so eingestellt, dass der Umgebungsdruck der zugeführten Luft 20 und der Druck des Brennstoffs 22 in der Brennstoffkammer 54 nahezu gleich sind und beim Zusammenführen in der Engstelle 18 im richtigen Mischungsverhältnis erfolgt. Weil die Einleitung des gasförmigen Brennstoffs in Richtung und Geschwindigkeit im Wesentlichen der Luftströmung entspricht und entlang der sich nach der Engstelle wieder aufweitenden Umgebung des Venturi-Rohres erfolgt, wird eine gegenüber dem Stand der Technik deutlich verbesserte Strömung im Diffusor erzielt. Dadurch kann das Gebläse 12 in einem weiten Modulationsbereich moduliert und die abgegebene Leistung des erfindungsgemäßen Heizgerätes 10 beeinflusst werden.The pressure conditions are adjusted in such a way that the ambient pressure of the supplied air 20 and the pressure of the fuel 22 in the fuel chamber 54 are almost the same and the correct mixing ratio takes place when they are brought together in the constriction 18 . Because the introduction of the gaseous fuel essentially corresponds in direction and speed to the air flow and takes place along the area surrounding the Venturi tube, which widens again after the constriction, a significantly improved flow in the diffuser is achieved compared to the prior art. As a result, the blower 12 can be modulated in a wide modulation range and the output power of the heater 10 according to the invention can be influenced.

In den Figuren 3 und 4 ist die erfindungsgemäße Brennstoff-Luft-Mischeinrichtung 16 detaillierter dargestellt. Es ist erkennbar, dass an der Engstelle 18 die Öffnung 24 ringförmig ausgestaltet ist und Brennstoff 22 ausgehend von der Brennstoffkammer 54 in die Venturi-Anordnung strömen kann. Es ist erkennbar, dass der Brennstoff 22 ausgehend von der Öffnung 24 entlang des Weges 56 in Strömungsrichtung der einströmenden Luft 20 zuführbar ist.In the Figures 3 and 4 the fuel-air mixing device 16 according to the invention is shown in more detail. It can be seen that the opening 24 is ring-shaped at the constriction 18 and fuel 22 can flow from the fuel chamber 54 into the venturi arrangement. It can be seen that the fuel 22 can be supplied starting from the opening 24 along the path 56 in the flow direction of the inflowing air 20 .

Im Verlaufe des Weges 56 strömt der Brennstoff 22 entlang einer inneren Wand 58 der Brennstoff-Luft-Mischeinrichtung 16. Im weiteren Verlauf beginnt eine Vermischung zwischen Brennstoff 22 und Luft 20, die dann im Gebläse 12 zu einer homogenen Vermischung vollendet wird. Durch diese Druckverhältnisse ist es möglich, das optimale Mischungsverhältnis von Luft 20 und Brennstoff 22 über einen großen Modulationsbereich des Gebläses 12 konstant zu halten.In the course of the path 56, the fuel 22 flows along an inner wall 58 of the fuel-air mixing device 16. In the further course, mixing between the fuel 22 and air 20 begins, which is then completed in the fan 12 to form a homogeneous mixture. These pressure conditions make it possible optimal mixing ratio of air 20 and fuel 22 over a large modulation range of the fan 12 to keep constant.

Die Öffnung 24 ist gebildet zwischen einer Verlängerung der inneren Wand 58 und einem Rohrabschnitt 60 des Einlasses 52. Die besondere Konstruktion ist so ausgeführt, dass sich der Rohrabschnitt 60 gegenüber der Inneren Wand 58 verschieben lässt und die Öffnung 24 damit in ihrer Größe einstellbar ausgebildet ist.The opening 24 is formed between an extension of the inner wall 58 and a tube section 60 of the inlet 52. The special design is such that the tube section 60 can be displaced relative to the inner wall 58 and the opening 24 is thus designed to be adjustable in size .

Wie in Figur 3 zu sehen ist, ist der Rohrabschnitt 60 Teil einer Muffe 62, die ihrerseits mit einem Grundkörper 64 der Brennstoff-Luft-Mischeinrichtung 16 zusammenwirkt. Die innere Wand 58, der Rohrabschnitt 60, die Muffe 62 und der Grundkörper 64 schließen die Brennstoffkammer 54 in sich ein. An den Grundkörper 64 ist darüber hinaus ein Anschluss 66 zum Anschließen der Leitung 30 zum Zuführung des Brennstoffes 22 angeformt.As in figure 3 As can be seen, the pipe section 60 is part of a sleeve 62 which in turn interacts with a base body 64 of the fuel/air mixing device 16 . The inner wall 58, tubular section 60, sleeve 62 and body 64 enclose the fuel chamber 54 therein. In addition, a connection 66 for connecting the line 30 for supplying the fuel 22 is integrally formed on the base body 64 .

Der Grundkörper 64 und die Muffe 62 sind über ein Gewinde 68 miteinander verbunden. Dadurch ist es möglich, durch Verdrehen der Muffe 62 relativ zum Grundkörper 64 eine axiale Verschiebung der Muffe 62 zum Grundkörper 64 zu erreichen und die Öffnung 24 in ihrer Größe zu verstellen. In einer Fortsetzung 69 der Muffe 62 über das Gewinde 68 hinaus sind eine oder mehrere Dichtungen bzw. Dichtungsräume 70 vorgesehen, die die Brennstoffkammer 54 nach außen abdichten.The base body 64 and the sleeve 62 are connected to one another via a thread 68 . This makes it possible, by rotating the sleeve 62 relative to the base body 64, to achieve an axial displacement of the sleeve 62 relative to the base body 64 and to adjust the size of the opening 24. In a continuation 69 of the sleeve 62 beyond the thread 68, one or more seals or sealing chambers 70 are provided, which seal off the fuel chamber 54 from the outside.

In einer nicht dargestellten Alternative könnte die Öffnung 24 durch Verschieben der Muffe 62 relativ zum Grundkörper 64 eingestellt werden. Es ist jedoch auch denkbar, eine Art Blende vorzusehen, die je nach Einstellung die Öffnung 24 mehr oder weniger verschließt. Da die Einstellung der Öffnung 24 fein dosierbar sein muss, um die entsprechenden Druckverhältnisse einstellen zu können, muss auch bei diesen Varianten ein exakt dosierbarer Verstellmechanismus vorgesehen sein.In an alternative, not shown, the opening 24 could be adjusted by sliding the sleeve 62 relative to the body 64. However, it is also conceivable to provide a type of screen that more or less closes the opening 24 depending on the setting. Since the setting of the opening 24 must be able to be finely dosed in order to be able to set the corresponding pressure conditions, an adjustment mechanism that can be precisely dosed must also be provided in these variants.

In den Figuren 3 und 4 ist schematisch eine Arretiereinrichtung 72 eingezeichnet. In diesem Ausführungsbeispiel wirkt die Arretiereinrichtung 72 zwischen dem Grundkörper 64 und der Muffe 62. Er verhindert, dass die einmal eingestellte Größe der Öffnung 24 wieder verändert wird. Im Ausführungsbeispiel erfolgt das dadurch, dass ein Verdrehen der Muffe 62 gegen den Grundkörper 64 verhindert wird. Sollte die Muffe 62 durch Verschieben auf die Größe der Öffnung 24 einwirken, würde die Arretiereinrichtung 72 so ausgestaltet sein, dass sie ein Verschieben verhindern kann.In the Figures 3 and 4 a locking device 72 is shown schematically. In this exemplary embodiment, the locking device 72 acts between the base body 64 and the sleeve 62. It prevents the size of the opening 24, once it has been set, from being changed again. In the exemplary embodiment, this is done by preventing the sleeve 62 from twisting against the base body 64 . Should the sleeve 62 affect the size of the opening 24 by shifting, the detent 72 would be configured to prevent shifting.

In Figur 5 ist eine erste Ausführungsform einer Arretiereinrichtung 72 in der Form einer Feststellschraube 74 dargestellt. Über diese Feststellschraube 74 wird ein an der Muffe 62 angeformter Kragen 76 mittels des Schraubenkopfs 78 gegenüber dem Grundkörper 64 verklemmt.In figure 5 a first embodiment of a locking device 72 in the form of a locking screw 74 is shown. A collar 76 formed on the sleeve 62 is clamped with respect to the base body 64 by means of the screw head 78 via this locking screw 74 .

Im Grundkörper 64 ist ein Verschiebekörper 80 angeordnet, der ein polygones Außenprofil aufweist, über das er in einem gleich geformten Innenprofil verschiebbar angeordnet ist. Auf diese Weise legt sich der Verschiebekörper 80, wenn die Feststellschraube 74 angezogen wird, spannungsfrei an den Kragen 74 an. Dies hat den Vorteil, dass keine Kräfte von außen auf die die Öffnung 24 bildende Teile wirken und die Öffnung 24 auch über einen längeren Zeitraum konstant gehalten werden kann. Diese Art der Arretierung hat ferner den Vorteil, dass die Öffnung 24 stufenlos eingestellt werden kann.A sliding body 80 is arranged in the base body 64 and has a polygonal outer profile, via which it is arranged to be displaceable in an inner profile of the same shape. In this way, when the locking screw 74 is tightened, the sliding body 80 rests against the collar 74 without tension. This has the advantage that no external forces act on the parts forming the opening 24 and the opening 24 can also be kept constant over a longer period of time. This type of locking also has the advantage that the opening 24 can be continuously adjusted.

Der Schraubenkopf 78 ist mit einer metallenen Schutzkappe 82 versehen, in die ein napfförmiges Verschlussteil 84 einpressbar ist. Das vorzugsweise aus Kunststoff bestehende Verschlussteil 84 verkeilt sich in der Schutzkappe 82 und kann nur durch Zerstörung entfernt werden. Auf diese Weise ist ein effektiver Schutz gegen Manipulation vorgesehen.The screw head 78 is provided with a metal protective cap 82 into which a cup-shaped closure part 84 can be pressed. The closure part 84, which is preferably made of plastic, is wedged in the protective cap 82 and can only be removed by destroying it. In this way, effective protection against manipulation is provided.

Ein weiteres Ausführungsbeispiel für eine Arretiereinrichtung 72 ist in Figur 6 zu sehen. Dort ist ein Rastelement 86 vorgesehen, das in eine an einem Kragen 88 des Grundkörpers 64 ausgenommene Öffnung 90 einrastet. Das Rastelement 86 ist an einem Rastclips 92 angeformt, der in der Zeichnung von oben auf den Kragen 88 aufgeschoben werden kann, so dass sich das Rastelement 86 auslenkt und bei weiterem Eindrücken in die Öffnung 90 verrastet. Gleichzeitig wird ein Fortsatz 94 auf einen umlaufenden Kragen 96 gedrückt, der an der Muffe 62 angeformt ist. Dazu weist der Kragen 96 Ausnehmungen 98 auf, in die Wände 100 des Fortsatzes 94 eingreifen und ein weiteres Verdrehen der Muffe 62 gegenüber dem Grundkörper 64 verhindern. Auf diese Weise ist gewährleistet, dass es beim Aufdrücken des Rastclips 92 nicht zu Spannungen zwischen der Muffe 62 und dem Grundkörper 64 kommt, die gegebenenfalls die Größe der Öffnung 24 beeinflussen könnten.Another embodiment of a locking device 72 is in figure 6 to see. A latching element 86 is provided there, which latches into an opening 90 made in a collar 88 of the base body 64 . The latching element 86 is formed on a latching clip 92 which, in the drawing, can be pushed onto the collar 88 from above, so that the latching element 86 deflects and latches into the opening 90 when pressed further. At the same time, an extension 94 is pressed onto an encircling collar 96 which is integrally formed on the sleeve 62 . For this purpose, the collar 96 has recesses 98 into which the walls 100 of the extension 94 engage and prevent the sleeve 62 from rotating further relative to the base body 64 . In this way it is ensured that when the locking clip 92 is pressed on there are no tensions between the sleeve 62 and the base body 64 which could possibly influence the size of the opening 24 .

Der Rastclips 92 ist so ausgestaltet, dass das Rastelement 86 nur dadurch aus der Öffnung 90 bewegt werden kann, dass eine am Rastclips 92 angebrachte dünne Wand 102 durchstoßen wird. Dadurch ist eine Manipulation, so sie stattfindet, nachträglich erkennbar.The latching clip 92 is designed in such a way that the latching element 86 can only be moved out of the opening 90 by a thin wall attached to the latching clip 92 102 is pierced. As a result, manipulation, if it takes place, can be identified retrospectively.

Ein drittes, ein Klappelement 104 aufweisendes Ausführungsbeispiel ist in Figur 7 dargestellt. Das Klappelement 104 weist einen in Seitenansicht L-förmigen und im Querschnitt U-förmigen Bügel 106 auf, der an einem am Grundelement angeformten ersten Block 108 angelenkt ist. Dadurch kann der Bügel 106 in Richtung auf einen an der Muffe 62 angeformten umlaufenden Kragen 110 verschenkt bzw. geklappt werden.A third embodiment having a folding element 104 is shown in figure 7 shown. The folding element 104 has a bracket 106 which is L-shaped in side view and U-shaped in cross section and which is articulated on a first block 108 formed on the base element. As a result, the bracket 106 can be given away or folded in the direction of a peripheral collar 110 formed on the sleeve 62 .

Wie in Figur 8 schematisch dargestellt ist, weist der umlaufende Kragen 110 eine Vielzahl von Nuten 112 auf, in die die Wände des U förmigen Bügels 106 eingreifen können. Ein Verdrehen der Muffe 62 gegenüber dem Grundkörper 64 ist dadurch verhindert und die Größe der eingestellten Öffnung 24 arretiert.As in figure 8 is shown schematically, the peripheral collar 110 has a plurality of grooves 112 into which the walls of the U-shaped bracket 106 can engage. This prevents the sleeve 62 from twisting relative to the base body 64 and the size of the adjusted opening 24 is locked.

Um die eingestellte Öffnungsgröße zu halten und das Abklappen des Bügels 106 zu verhindern, ist am Grundkörper 64 ein zweiter Block 112 angeformt, der eine Durchgangsöffnung 114 aufweist, die mit einer Durchgangsöffnung 116 am Bügel 106 in arretierter Position fluchtet. Durch diese Öffnungsstruktur kann beispielsweise der Draht einer Plombe eingefädelt und gesichert werden. Das Klappelement 104 ist damit gegenüber Manipulation gesichert.In order to maintain the set opening size and to prevent the bracket 106 from folding down, a second block 112 is formed on the base body 64 and has a through-opening 114 which is aligned with a through-opening 116 on the bracket 106 in the locked position. The wire of a seal, for example, can be threaded through this opening structure and secured. The folding element 104 is thus secured against manipulation.

Auch wenn hier nur Arretiereinrichtungen 72 vorgestellt sind, die ein Verdrehen verhindern, ist es möglich, durch geringen konstruktiven Umbau auch ein Verschieben der Muffe 62 gegenüber dem Grundkörper 64 zu verhindern und die Öffnung 24 damit zu arretieren.Even if only locking devices 72 are presented here, which prevent twisting, it is possible to prevent the sleeve 62 from shifting relative to the base body 64 and thus to lock the opening 24 by means of minor structural modifications.

Claims (12)

  1. Fuel-air mixing device (16) with an air inlet (52), a constriction (18), at least one opening (24) in the region of the constriction for feeding in, in particular, gaseous fuel (22), the opening (24) being of adjustable configuration, a locking device (72) for locking the adjustable opening (24) being provided, characterized in that the locking device (72) has a fixing screw (74).
  2. Fuel-air mixing device (16) according to Claim 1, characterized in that the locking device (72) can be closed, in particular can be sealed.
  3. Fuel-air mixing device (16) according to either of the preceding claims, characterized in that the fixing screw (74) bears a protective cap (82).
  4. Fuel-air mixing device (16) according to either of Claims 1 or 2, characterized in that the locking device (72) has a latching element (86).
  5. Fuel-air mixing device (16) according to either of Claims 1 or 2, characterized in that the locking device (72) has a folding element (104).
  6. Fuel-air mixing device (16) according to Claim 5, characterized in that the folding element (104) has a through opening (116) which is aligned with a stationary element.
  7. Fuel-air mixing device (16) according to one of the preceding claims, characterized in that the opening (24) is an annular gap.
  8. Fuel-air mixing device (16) according to one of the preceding claims, characterized in that the opening (24) is formed between a main body (64) and a sleeve (62).
  9. Fuel-air mixing device (16) according to Claim 8, characterized in that the sleeve (62) can be moved relative to the main body (64).
  10. Fuel-air mixing device (16) according to either of Claims 8 or 9, characterized in that the main body (64) and the sleeve (62) are connected to one another via a thread (68).
  11. Heating unit (10) with a burner (14) which is assisted by a fan (12), and with a fuel-air mixing device (16) according to one of the preceding claims which feeds, in particular, gaseous fuel (22) via at least one opening (24) in the region of a constriction (18) to air (20) which flows via a line (26, 30).
  12. Heating unit (10) according to Claim 11, characterized in that the opening (24) is the essential throttling means of the fuel between the line (26, 30) and the addition to the air (20), and in that a fuel regulating valve (28) which provides the fuel (22) at a predefinable pressure is provided in the line (26, 30).
EP14186733.3A 2013-10-16 2014-09-29 Fuel-Air Mixing Device Active EP2863120B1 (en)

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US9746176B2 (en) 2014-06-04 2017-08-29 Lochinvar, Llc Modulating burner with venturi damper
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DE102022112769A1 (en) 2022-05-20 2023-11-23 Vaillant Gmbh Heater and use of an adjustment arrangement

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