EP2686609B1 - Mixing device for mixing combustion air and gas for a gas appliance - Google Patents

Mixing device for mixing combustion air and gas for a gas appliance Download PDF

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Publication number
EP2686609B1
EP2686609B1 EP12705644.8A EP12705644A EP2686609B1 EP 2686609 B1 EP2686609 B1 EP 2686609B1 EP 12705644 A EP12705644 A EP 12705644A EP 2686609 B1 EP2686609 B1 EP 2686609B1
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EP
European Patent Office
Prior art keywords
housing
mixing device
nozzle insert
gas
nozzle
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EP12705644.8A
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German (de)
French (fr)
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EP2686609A2 (en
Inventor
Tobias Metz
Hans-Joachim Klink
Frank Schlopakowski
Christian PETRYSZAK
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Ebm Papst Landshut GmbH
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Ebm Papst Landshut GmbH
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Classifications

    • 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
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L5/00—Blast-producing apparatus before the fire
    • F23L5/02—Arrangements of fans or blowers

Definitions

  • the invention relates to a mixing device for mixing combustion air and gas for a gas appliance or a gas heater, in which combustion air is sucked in via a blower and the combustion gas is fed into the mixing device upstream of the blower in the flow direction.
  • the WO 2005/078343 A1 a mixing device for mixing gas and combustion air for a gas burner, comprising a housing and a Venturi nozzle, which is integrated into the housing such that the housing and the venturi are formed as a monolithic unit.
  • the EP 0 846 916 A2 a combustion air / gas mixing apparatus having a double-cone venturi nozzle body disposed in a tubular channel. Both the duct and the Venturi nozzle have side openings for supplying combustion gas to the combustion air flowing through the Venturi nozzle.
  • a similar structure with additionally upstream arranged twisting device for the combustion air discloses the WO 02/29319 A1 ,
  • the mixing devices known from the prior art are each connected to a gas heater of predetermined power, wherein the output from the gas heater power significantly from that through the mixing device provided amount of fuel (gas) and air depends.
  • Gas heaters are offered and needed in a wide performance range. In this case, not only the gas appliances themselves, but also the mixing devices connected thereto must be structurally adapted in terms of their flow capacity. However, this requires a considerable constructive and technical tooling effort. The large number of tools required and the production of the components adapted to the required performance levels are cost-intensive.
  • a mixing device for mixing combustion air and gas for a gas appliance or a gas heater is provided with a housing with connectable gas supply, a replaceable in the housing arranged nozzle insert having a predetermined flow cross-sectional area, wherein the housing has an inlet region, the forming an inlet section of a venturi nozzle tapering in the flow direction, and wherein the nozzle insert forms at least one flow-expanding outlet section of the venturi nozzle.
  • the Venturi nozzle is thus formed by the integrated into the housing inlet area and an additional element, namely the nozzle insert whose fürströmungsqueritess constitutional can be adjusted according to the required capacity of the gas heater -
  • the housing and its inlet area are therefore the same for all power sizes, so that the need is eliminated to provide different housings for different output sizes.
  • the housing is made of aluminum, that the gas valve can be attached or flanged directly to the housing.
  • custom housing shapes with correspondingly adapted diecasting tools per power range had to be provided for the casings usually produced by die casting.
  • the housing shape in the inlet region for all power ranges is always the same, always the same die casting tool can be used, whereby the manufacturing cost of the mixing device are significantly reduced.
  • the nozzle insert is interchangeable arranged in the housing, so that during assembly or after commissioning of the device by replacing the nozzle insert variable power variables can be realized.
  • the inlet region of the housing extends in the flow direction to the smallest cross section of the Venturi nozzle.
  • the area of the narrowest cross-section prevails according to the law of Bernoulli the highest flow velocity and thus the lowest pressure, so that preferably in these areas, the gas supply, for example via an annular gap occurs.
  • the negative pressure acting within the Venturi nozzle acts on the gas valve and thus controls the amount of gas supplied, with a lot of gas at a higher negative pressure and less gas at a lower negative pressure.
  • the invention thus provides that a transition of the inlet region of the housing to the nozzle insert forms the smallest cross section of the Venturi nozzle.
  • the gas is supplied via an arranged in the housing antechamber via annular gaps from the radial direction of the flow through the venturi.
  • the geometry of the nozzle insert in the edge region of the transition to the inlet region of the housing may also be the same for all services. According to the invention it is provided that for low heat outputs, in which the flow velocity in the region of the transition would be too low to ensure a predetermined control of the gas valve, in the interior of the nozzle insert over a predetermined axial length extending, the flow cross-sectional area reducing displacement body is formed.
  • the displacement body is understood to be any geometric shape which results in the throughflow cross-sectional area of the nozzle insert being reduced such that the flow velocity in the venturi nozzle is increased in the region of the transition from the inlet region of the housing to the nozzle insert.
  • the displacer protrudes upstream over the axial end of the nozzle insert and tapers in the protruding region, so that the flow is divided and also applies to the displacer.
  • the power range of the mixing device is adjustable, the power decreases with increasing diameter of the displacer.
  • the protrusion of the displacer over the axial edge of the nozzle insert favors that the flow velocity in the region of the transition from the inlet region to the nozzle insert is already maximum.
  • the downstream axial end is open.
  • the nozzle insert is made of plastic, so that the nozzle insert with the displacement body with a simple open-to-tool without slider injection molding is inexpensive to produce.
  • the displacer body may extend in the axial flow direction over the entire length of the nozzle insert, wherein embodiments are preferred in which the extension is 70 to 90%, since the pressure recovery in the expanding outlet region of the Venturi nozzle is greatest when the axial end of the displacer is spaced from the axial end of the nozzle insert on the downstream side.
  • the mixing device is connected to a blower with blower housing such that the housing is formed integrally with the blower housing.
  • the mixing device is thus integrated into the blower, wherein the heating power can be adapted via the variability of the nozzle inserts and their variable flow cross-sectional area. Furthermore, with such a design eliminates the need to seal the mixing device to the fan housing. Leaks in the attachment between the housing and blower housing are thus excluded.
  • the nozzle insert it is favorable for the nozzle insert to be fastened in a form-fitting manner, at least in sections, at its downstream end, sealingly against the housing.
  • the nozzle insert can then be inserted into the housing in such a way that form-fitting contact surfaces for avoiding gas leaks are provided at radial edge regions.
  • a seal can be additionally provided between the housing and the fan housing.
  • Fig. 1 shows a side sectional view of the mixing device 1 integrally formed on the fan housing 9, in which an unillustrated impeller, the combustion air and the gas in the flow direction S sucks through the mixing device 1.
  • the mixing device 1 comprises a Venturi nozzle 3, which is formed in sections from the housing 2 of the mixing device 1 and a nozzle insert 4 detachably inserted into the housing 2.
  • the housing 2 has an inlet region 6, which forms an inlet section 7 of the venturi nozzle 3 tapering in the direction of flow, in that the wall sections of the housing 2 extend in a funnel shape toward the axial center axis of the venturi nozzle 3.
  • Adjoining the inlet section 7 of the housing 2 is the nozzle insert 4, which at the transition 10 forms the smallest cross section of the venturi nozzle 3 and, in the flow direction S, subsequently the expanding outlet section 13 of the venturi nozzle 3.
  • the predetermined by the nozzle insert 4 Norströmungsqueritess response Q of the venturi 3 determines and limits the maximum (heating) power of the connected gas appliance.
  • the flow velocity and the associated negative pressure generated by the Venturi nozzle 3 is maximum, so that at the transition 10 gas inlet openings 11 are provided in the form of an annular gap through which the gas from a between the nozzle insert 4th and the outer wall of the housing 2 lying pre-chamber 16 is sucked.
  • the pre-chamber 16 is fluidically (pneumatically) connected to the gas valve, so that the negative pressure generated by the Venturi nozzle 3, the open position of the gas valve and thus controls the delivered gas quantity.
  • the nozzle insert 4 has bulges 15 extending in the axial direction, along which the gas inflow takes place.
  • the embodiment shown is directed to gas appliances with relatively high heat outputs, in which relatively small amounts of combustion air and gas are promoted.
  • Fig. 2 shows an embodiment of the mixing device 1 for lower power, in which the flow cross-sectional area Q of the Venturi nozzle 3 is reduced in order to ensure sufficiently high flow velocities in the region of the gas inlet openings 11.
  • a nozzle insert 4 is inserted, in the interior, in the center of the flow cross-sectional area Q, a displacement body 5 is formed, which extends over 90% of the axial length of the nozzle insert 4.
  • the displacer 5 is a hollow body whose downstream axial end 8 is open.
  • the displacer 5 extends beyond the axial end of the nozzle insert 4 and is tapered in the projecting portion 17 to ensure a division and early concern of the flow to the displacer 5 and the inner walls of the nozzle insert 4.
  • the displacer 5 has reached its maximum diameter in order to realize the maximum flow velocity in the region of the smallest cross section of the Venturi nozzle 3.
  • the axial extent of the displacement body 5 shown allows the greatest possible pressure recovery in the direction of flow S expanding outlet portion 13 of the nozzle insert 4 of the venturi 3.
  • the downstream axial end 8 of the displacer 5 is spaced from the downstream axial end 14 of the nozzle insert 4.
  • Fig. 3 is the in Fig. 2 shown nozzle insert 4, wherein it can be seen that the displacement body 5 is held by means of vertical webs 12 in the center of the flow.
  • the housing 2 and the fan housing 9 are made of aluminum in the die-cast aluminum process, the nozzle insert 4 made of plastic by injection molding.
  • the invention is not limited to the preferred embodiments specified above. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.
  • the in Fig. 1 shown embodiment can be realized with an attached to the blower housing 9 additional housing 2. It can also be provided to produce the housing 2 made of plastic, if the gas valve is not to be attached directly thereto. Since plastic changes its material properties over the life of the gas heater and does not ensure the required safety, it can be provided that the housing 2 is replaced after a predetermined period of use.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Gas Burners (AREA)

Description

Die Erfindung betrifft eine Mischvorrichtung zur Mischung von Verbrennungsluft und Gas für ein Gasgerät bzw. ein Gasheizgerät, bei dem über ein Gebläse Verbrennungsluft angesaugt und in der dem Gebläse in Strömungsrichtung vorgeschalteten Mischvorrichtung das Verbrennungsgas zugeführt wird.The invention relates to a mixing device for mixing combustion air and gas for a gas appliance or a gas heater, in which combustion air is sucked in via a blower and the combustion gas is fed into the mixing device upstream of the blower in the flow direction.

Derartige Aufbauten sind aus verschiedenen Schriften des Standes der Technik bekannt. Beispielsweise offenbart die WO 2005/078343 A1 eine Mischvorrichtung zum Mischen von Gas und Verbrennungsluft für einen Gasbrenner, die ein Gehäuse und eine Venturidüse aufweist, die derart in das Gehäuse integriert ist, dass das Gehäuse und die Venturidüse als monolithische Einheit ausgebildet sind.Such structures are known from various prior art documents. For example, the WO 2005/078343 A1 a mixing device for mixing gas and combustion air for a gas burner, comprising a housing and a Venturi nozzle, which is integrated into the housing such that the housing and the venturi are formed as a monolithic unit.

Ferner offenbart die EP 0 846 916 A2 eine Mischvorrichtung für Verbrennungsluft und Gas mit einem Venturidüsenkörper in Doppelkonusform, der in einem rohrförmigen Kanal angeordnet ist. Sowohl der Kanal als auch die Venturidüse weisen seitliche Öffnungen zur Zuführung von Verbrennungsgas zu der die Venturidüse durchströmenden Verbrennungsluft auf. Einen ähnlichen Aufbau mit zusätzlich stromaufwärts angeordneter Drallerzeugungseinrichtung für die Verbrennungsluft offenbart die WO 02/29319 A1 .Further, the EP 0 846 916 A2 a combustion air / gas mixing apparatus having a double-cone venturi nozzle body disposed in a tubular channel. Both the duct and the Venturi nozzle have side openings for supplying combustion gas to the combustion air flowing through the Venturi nozzle. A similar structure with additionally upstream arranged twisting device for the combustion air discloses the WO 02/29319 A1 ,

Die aus dem Stand der Technik bekannten Mischeinrichtungen werden jeweils an ein Gasheizgerät vorbestimmter Leistung angeschlossen, wobei die von dem Gasheizgerät abgegebene Leistung wesentlich von der durch die Mischeinrichtung bereitgestellten Menge von Brennstoff (Gas) und Luft abhängt. Gasheizgeräte werden in einem großen Leistungsbereich angeboten und benötigt. Dabei müssen dann nicht nur die Gasgeräte selbst, sondern auch die daran angeschlossenen Mischeinrichtungen hinsichtlich ihrer Durchströmungskapazität bautechnisch angepasst werden. Hierzu ist jedoch ein erheblicher konstruktiver und werkzeugtechnischer Aufwand notwendig. Die Vielzahl der notwendigen Werkzeuge und die Herstellung der an die jeweils benötigten Leistungsgrößen angepassten Bauteile sind kostenintensiv.The mixing devices known from the prior art are each connected to a gas heater of predetermined power, wherein the output from the gas heater power significantly from that through the mixing device provided amount of fuel (gas) and air depends. Gas heaters are offered and needed in a wide performance range. In this case, not only the gas appliances themselves, but also the mixing devices connected thereto must be structurally adapted in terms of their flow capacity. However, this requires a considerable constructive and technical tooling effort. The large number of tools required and the production of the components adapted to the required performance levels are cost-intensive.

Da das Mischungsverhältnis von Brennstoff und Luft für eine stöchiometrische Verbrennung unabhängig von der Leistung konstant ist, muss durch die Mischeinrichtung für höhere Leistungen mehr Verbrennungsluft und mehr Brennstoff gefördert werden. Für eine geringere Leistung werden beide Massenströme entsprechend reduziert. Durch die bei den Mischeinrichtungen gemäß dem Stand der Technik festgelegte Bauart der einzelnen Bauteile, insbesondere der verwendeten Mischdüsen, ist eine Anpassung des Leistungsbereichs nur in geringem Maße möglich. Bei zu geringen Strömungsgeschwindigkeiten reicht der von der jeweiligen Düse erzeugte Unterdruck nicht mehr aus, um die benötigte Gasmenge in die Düse anzusaugen, da die Steuerung der zuzuführenden Gasmenge bei derartigen Aufbauten pneumatisch erfolgt, wobei über den von der Düse erzeugten Unterdruck die Öffnungsstellung des Gasventils gesteuert wird.Since the mixing ratio of fuel and air for a stoichiometric combustion is constant regardless of the power, more combustion air and more fuel must be promoted by the higher performance mixing device. For lower power both mass flows are reduced accordingly. Due to the specified in the mixing devices according to the prior art design of the individual components, in particular the mixing nozzles used, an adjustment of the power range is possible only to a small extent. At too low flow velocities, the negative pressure generated by the respective nozzle is no longer sufficient to suck the required amount of gas into the nozzle, since the control of the amount of gas to be supplied pneumatically in such structures, controlled by the negative pressure generated by the nozzle, the open position of the gas valve becomes.

Weiterer Stand der Technik im vorliegenden technischen Gebiet ist offenbart in den Druckschriften US 2,068,567 , EP 0 890 787 A2 , EP 0 896 192 A2 und US 6,604,938 B1 .Further prior art in the present technical field is disclosed in the documents US 2,068,567 . EP 0 890 787 A2 . EP 0 896 192 A2 and US Pat. No. 6,604,938 B1 ,

Ausgehend von den aus dem Stand der Technik bekannten Mischeinrichtungen ist es die Aufgabe der Erfindung, eine Mischvorrichtung bereitzustellen, die mit einer Vielzahl von identischen Bauteilen ein großes Leistungsspektrum für Gasheizgeräte erfüllen kann.Starting from the known from the prior art mixing devices, it is the object of the invention to provide a mixing device that can meet a large power spectrum for gas heaters with a variety of identical components.

Diese Aufgaben werden durch eine Mischvorrichtung mit den jeweiligen Merkmalen der Ansprüche 1.These objects are achieved by a mixing device having the respective features of claims 1.

Erfindungsgemäß ist hierzu eine Mischvorrichtung zur Mischung von Verbrennungsluft und Gas für ein Gasgerät bzw. ein Gasheizgerät vorgesehen, mit einem Gehäuse mit daran anschließbarer Gaszuführung, einem in dem Gehäuse auswechselbar angeordneten Düseneinsatz, der eine vorbestimmte Durchströmungsquerschnittsfläche aufweist, wobei das Gehäuse einen Einlassbereich aufweist, der einen sich in Strömungsrichtung verjüngenden Einlassabschnitt einer Venturidüse bildet, und wobei der Düseneinsatz zumindest einen sich in Strömungsrichtung erweiternden Auslassabschnitt der Venturidüse bildet.According to the invention for this purpose, a mixing device for mixing combustion air and gas for a gas appliance or a gas heater is provided with a housing with connectable gas supply, a replaceable in the housing arranged nozzle insert having a predetermined flow cross-sectional area, wherein the housing has an inlet region, the forming an inlet section of a venturi nozzle tapering in the flow direction, and wherein the nozzle insert forms at least one flow-expanding outlet section of the venturi nozzle.

Die Venturidüse wird somit durch den in das Gehäuse integrierten Einlassbereich und ein zusätzliches Element, nämlich den Düseneinsatz gebildet, dessen Durchströmungsquerschnittsfläche entsprechend der notwendigen Leistungsgröße des Gasheizgeräts angepasst werden kann- Das Gehäuse und dessen Einlassbereich sind folglich für alle Leistungsgrößen gleich, so dass die Notwendigkeit entfällt, für verschiedene Leistungsgrößen unterschiedliche Gehäuse vorzusehen. In einer bevorzugten Ausführung ist das Gehäuse aus Aluminium hergestellt, dass das Gasventil direkt an dem Gehäuse befestigt bzw. angeflanscht werden kann. Bisher mussten für die üblicherweise im Druckgussverfahren hergestellten Gehäuse individuelle Gehäuseformen mit entsprechend angepassten Druckgusswerkzeugen pro Leistungsbereich bereitgestellt werden. Dadurch, dass bei der Erfindung die Gehäuseform im Einlassbereich für alle Leistungsbereiche stets gleich bleibt, kann auch stets das gleiche Druckgusswerkzeug verwendet werden, wodurch die Herstellkosten der Mischvorrichtung erheblich reduziert sind.The Venturi nozzle is thus formed by the integrated into the housing inlet area and an additional element, namely the nozzle insert whose Durchströmungsquerschnittsfläche can be adjusted according to the required capacity of the gas heater - The housing and its inlet area are therefore the same for all power sizes, so that the need is eliminated to provide different housings for different output sizes. In a preferred embodiment, the housing is made of aluminum, that the gas valve can be attached or flanged directly to the housing. Until now, custom housing shapes with correspondingly adapted diecasting tools per power range had to be provided for the casings usually produced by die casting. The fact that in the invention, the housing shape in the inlet region for all power ranges is always the same, always the same die casting tool can be used, whereby the manufacturing cost of the mixing device are significantly reduced.

Günstig ist hierbei, dass der Düseneinsatz auswechselbar in dem Gehäuse angeordnet ist, so dass bei der Montage oder auch nach Inbetriebnahme des Geräts durch Austausch des Düseneinsatzes variable Leistungsgrößen realisierbar sind.It is favorable in this case that the nozzle insert is interchangeable arranged in the housing, so that during assembly or after commissioning of the device by replacing the nozzle insert variable power variables can be realized.

In einer vorteilhaften Ausführung erstreckt sich der Einlassbereich des Gehäuses in Strömungsrichtung bis zum geringsten Querschnitt der Venturidüse. Im Bereich des engsten Querschnitts herrscht nach dem Gesetz von Bernoulli die höchste Strömungsgeschwindigkeit und somit der geringste Druck, so dass vorzugsweise in diesen Bereichen die Gaszuführung, beispielsweise über einen Ringspalt, erfolgt. Der innerhalb der Venturidüse wirkende Unterdruck wirkt auf das Gasventil und steuert somit die zugeführte Gasmenge, wobei bei stärkerem Unterdruck viel Gas und bei geringerem Unterdruck wenig Gas zugeführt wird.In an advantageous embodiment, the inlet region of the housing extends in the flow direction to the smallest cross section of the Venturi nozzle. In the area of the narrowest cross-section prevails according to the law of Bernoulli the highest flow velocity and thus the lowest pressure, so that preferably in these areas, the gas supply, for example via an annular gap occurs. The negative pressure acting within the Venturi nozzle acts on the gas valve and thus controls the amount of gas supplied, with a lot of gas at a higher negative pressure and less gas at a lower negative pressure.

In einer bevorzugten Ausführung sieht die Erfindung somit vor, dass ein Übergang des Einlassbereichs des Gehäuses zu dem Düseneinsatz den geringsten Querschnitt der Venturidüse bildet. Das Gas wird über eine in dem Gehäuse angeordnete Vorkammer über Ringspalte aus radialer Richtung der Strömung durch die Venturidüse zugeführt.In a preferred embodiment, the invention thus provides that a transition of the inlet region of the housing to the nozzle insert forms the smallest cross section of the Venturi nozzle. The gas is supplied via an arranged in the housing antechamber via annular gaps from the radial direction of the flow through the venturi.

Die Geometrie des Düseneinsatzes im Randbereich des Übergangs zu dem Einlassbereich des Gehäuses kann ebenfalls für alle Leistungen gleich ausgebildet sein. Erfindungsgemäß ist vorgesehen, dass für geringe Heizleistungen, bei denen die Strömungsgeschwindigkeit im Bereich des Übergangs zu gering wäre, um eine vorbestimmte Steuerung des Gasventils zu gewährleisten, im Inneren des Düseneinsatzes ein sich über eine vorbestimmte
axiale Länge erstreckender, die Durchströmungsquerschnittsfläche verringernder Verdrängerkörper ausgebildet ist. Als Verdrängerkörper wird vorliegend jede geometrische Form verstanden, die dazu führt, dass die Durchströmungsquerschnittsfläche des Düseneinsatzes derart verringert wird, dass die Strömungsgeschwindigkeit in der Venturidüse im Bereich des Übergangs von dem Einlassbereich des Gehäuses zu dem Düseneinsatz erhöht wird.The geometry of the nozzle insert in the edge region of the transition to the inlet region of the housing may also be the same for all services. According to the invention it is provided that for low heat outputs, in which the flow velocity in the region of the transition would be too low to ensure a predetermined control of the gas valve, in the interior of the nozzle insert over a predetermined
axial length extending, the flow cross-sectional area reducing displacement body is formed. In the present case, the displacement body is understood to be any geometric shape which results in the throughflow cross-sectional area of the nozzle insert being reduced such that the flow velocity in the venturi nozzle is increased in the region of the transition from the inlet region of the housing to the nozzle insert.

Günstig ist hierbei insbesondere eine Ausbildung, bei der der Verdrängerkörper stromaufwärts über das axiale Ende des Düseneinsatzes hervorsteht und in dem hervorstehenden Bereich spitz zuläuft, so dass die Strömung aufgeteilt wird und sich auch an dem Verdrängerkörper anlegt. Über den Durchmesser des Verdrängerkörpers und die damit einhergehende Reduzierung der Durchströmungsquerschnittsfläche des Düseneinsatzes ist der Leistungsbereich der Mischvorrichtung anpassbar, wobei die Leistung mit zunehmendem Durchmesser des Verdrängerkörpers abnimmt. Auch begünstigt das Vorstehen des Verdrängerkörpers über den axialen Rand des Düseneinsatzes, dass die Strömungsgeschwindigkeit im Bereich des Übergangs von dem Einlassbereich zu dem Düseneinsatz bereits maximal ist.Convenient in this case is an embodiment in which the displacer protrudes upstream over the axial end of the nozzle insert and tapers in the protruding region, so that the flow is divided and also applies to the displacer. About the diameter of the displacer and the concomitant reduction of the flow cross-sectional area of the nozzle insert, the power range of the mixing device is adjustable, the power decreases with increasing diameter of the displacer. Also, the protrusion of the displacer over the axial edge of the nozzle insert favors that the flow velocity in the region of the transition from the inlet region to the nozzle insert is already maximum.

In einer aus herstellungstechnischer Sicht bevorzugten Ausführung ist der Verdrängerkörper ein Hohlkörper, dessen stromabwärts liegendes axiales Ende offen ist. Vorzugsweise wird der Düseneinsatz aus Kunststoff gefertigt, so dass der Düseneinsatz mit dem Verdrängerkörper mit einem einfachen Auf-Zu-Werkzeug ohne Schieber im Spritzgussverfahren kostengünstig herstellbar ist.In a production-preferred view preferred embodiment of the displacer is a hollow body, the downstream axial end is open. Preferably, the nozzle insert is made of plastic, so that the nozzle insert with the displacement body with a simple open-to-tool without slider injection molding is inexpensive to produce.

Der Verdrängerkörper kann sich in axialer Strömungsrichtung über die gesamte Länge des Düseneinsatzes erstrecken, wobei Ausführungen bevorzugt sind, bei denen die Erstreckung 70 bis 90 % beträgt, da der Druckrückgewinn im sich aufweitenden Auslassbereich der Venturidüse dann am größten ist, wenn das axiale Ende des Verdrängerkörpers von dem axialen Ende des Düseneinsatzes auf der stromabwärtigen Seite beabstandet ist.The displacer body may extend in the axial flow direction over the entire length of the nozzle insert, wherein embodiments are preferred in which the extension is 70 to 90%, since the pressure recovery in the expanding outlet region of the Venturi nozzle is greatest when the axial end of the displacer is spaced from the axial end of the nozzle insert on the downstream side.

Bei einer Ausführungsvariante der erfindungsgemäßen Mischvorrichtung ist vorgesehen, dass diese an ein Gebläse mit Gebläsegehäuse derart angeschlossen ist, dass das Gehäuse einteilig mit dem Gebläsegehäuse ausgebildet ist. Die Mischvorrichtung ist somit in das Gebläse integriert, wobei die Heizleistung über die Variabilität der Düseneinsätze und deren variable Durchströmungsquerschnittsfläche anpassbar ist. Ferner entfällt bei einer solchen Ausbildung die Notwendigkeit, die Mischvorrichtung an dem Gebläsegehäuse abzudichten. Leckagen an der Befestigung zwischen Gehäuse und Gebläsegehäuse sind somit ausgeschlossen.In one embodiment variant of the mixing device according to the invention, it is provided that it is connected to a blower with blower housing such that the housing is formed integrally with the blower housing. The mixing device is thus integrated into the blower, wherein the heating power can be adapted via the variability of the nozzle inserts and their variable flow cross-sectional area. Furthermore, with such a design eliminates the need to seal the mixing device to the fan housing. Leaks in the attachment between the housing and blower housing are thus excluded.

Bei der Erfindung ist es günstig, dass der Düseneinsatz an seinem stromabwärts liegenden Ende dichtend an dem Gehäuse zumindest abschnittsweise formschlüssig anliegend befestigt ist. Der Düseneinsatz kann dann derart in das Gehäuse eingelegt werden, dass an radialen Randbereichen formschlüssige Kontaktflächen zur Vermeidung von Gasleckagen bereitgestellt sind. Zur Absicherung kann zusätzlich zwischen dem Gehäuse und dem Gebläsegehäuse eine Dichtung vorgesehen werden.In the case of the invention, it is favorable for the nozzle insert to be fastened in a form-fitting manner, at least in sections, at its downstream end, sealingly against the housing. The nozzle insert can then be inserted into the housing in such a way that form-fitting contact surfaces for avoiding gas leaks are provided at radial edge regions. To secure a seal can be additionally provided between the housing and the fan housing.

Bevorzugte Weiterbildung der Erfindung sind in den Unteransprüchen definiert und ergeben sich aus der nachfolgenden Beschreibung. Ohne hierauf beschränkt zu sein, werden Ausführungsbeispiele anhand der beigefügten Zeichnungen näher erläutert. Darin bezeichnen gleiche Bezugszeichen gleiche Bauteile in allen Ausführungsbeispielen. Die beispielhaft schematischen Zeichnungen zeigen:

Fig.1
eine seitliche Querschnittsansicht einer Mischvorrichtung integriert in ein Gebläsegehäuse;
Fig. 2
eine seitliche Schnittansicht einer Mischvorrichtung befestigt an einem Gebläsegehäuse;
Fig. 3
eine perspektivische Ansicht eines Düseneinsatzes.
Preferred embodiments of the invention are defined in the subclaims and will become apparent from the following description. Without being limited thereto, embodiments are explained in more detail with reference to the accompanying drawings. Therein, like reference numerals designate like components in all embodiments. The exemplary schematic drawings show:
Fig.1
a side cross-sectional view of a mixing device integrated in a fan housing;
Fig. 2
a side sectional view of a mixing device attached to a fan housing;
Fig. 3
a perspective view of a nozzle insert.

Fig. 1 zeigt eine seitliche Schnittansicht der Mischvorrichtung 1 einteilig ausgebildet an dem Gebläsegehäuse 9, in dem ein nicht dargestelltes Gebläserad die Verbrennungsluft und das Gas in Strömungsrichtung S durch die Mischvorrichtung 1 ansaugt. Über einen Flansch 19 ist das Gebläsegehäuse 9 an einem Gasgerät befestigbar. Die Mischvorrichtung 1 umfasst eine Venturidüse 3, die abschnittsweise aus dem Gehäuse 2 der Mischvorrichtung 1 und einem lösbar in das Gehäuse 2 eingesetzten Düseneinsatz 4 gebildet ist. Das Gehäuse 2 weist hierzu einen Einlassbereich 6 auf, der einen sich in Strömungsrichtung verjüngenden Einlassabschnitt 7 der Venturidüse 3 bildet, indem sich die Wandabschnitte des Gehäuses 2 trichterförmig zur axialen Mittelachse der Venturidüse 3 hin erstrecken. An den Einlassabschnitt 7 des Gehäuses 2 schließt sich der Düseneinsatz 4 an, der am Übergang 10 den geringsten Querschnitt der Venturidüse 3 und in Strömungsrichtung S nachfolgend den sich erweiternden Auslassabschnitt 13 der Venturidüse 3 bildet. Die durch den Düseneinsatz 4 vorbestimmte Durchströmungsquerschnittsfläche Q der Venturidüse 3 bestimmt und begrenzt die maximale (Heiz-)Leistung des angeschlossenen Gasgeräts. Am Übergang 10 des Einlassabschnitts 7 zu dem Düseneinsatz 4 ist die Strömungsgeschwindigkeit und der damit einhergehende, von der Venturidüse 3 erzeugte Unterdruck maximal, so dass am Übergang 10 Gaseinlassöffnungen 11 in Form eines Ringspalts vorgesehen sind, durch die das Gas aus einer zwischen dem Düseneinsatz 4 und der Außenwand des Gehäuses 2 liegenden Vorkammer 16 eingesaugt wird. Die Vorkammer 16 ist strömungstechnisch (pneumatisch) mit dem Gasventil verbunden, so dass der von der Venturidüse 3 erzeugte Unterdruck die Öffnungsstellung des Gasventils und somit die gelieferte Gasmenge steuert. Der Düseneinsatz 4 weist sich in axialer Richtung erstreckende Ausbuchtungen 15 auf, entlang deren die Gaseinströmung erfolgt. Die gezeigte Ausführung richtet sich an Gasgeräte mit im Verhältnis hohen Heizleistungen, bei denen verhältnismäßig geringe Mengen an Verbrennungsluft und Gas gefördert werden. Fig. 1 shows a side sectional view of the mixing device 1 integrally formed on the fan housing 9, in which an unillustrated impeller, the combustion air and the gas in the flow direction S sucks through the mixing device 1. Via a flange 19, the blower housing 9 can be attached to a gas appliance. The mixing device 1 comprises a Venturi nozzle 3, which is formed in sections from the housing 2 of the mixing device 1 and a nozzle insert 4 detachably inserted into the housing 2. For this purpose, the housing 2 has an inlet region 6, which forms an inlet section 7 of the venturi nozzle 3 tapering in the direction of flow, in that the wall sections of the housing 2 extend in a funnel shape toward the axial center axis of the venturi nozzle 3. Adjoining the inlet section 7 of the housing 2 is the nozzle insert 4, which at the transition 10 forms the smallest cross section of the venturi nozzle 3 and, in the flow direction S, subsequently the expanding outlet section 13 of the venturi nozzle 3. The predetermined by the nozzle insert 4 Durchströmungsquerschnittsfläche Q of the venturi 3 determines and limits the maximum (heating) power of the connected gas appliance. At the transition 10 of the inlet section 7 to the nozzle insert 4, the flow velocity and the associated negative pressure generated by the Venturi nozzle 3 is maximum, so that at the transition 10 gas inlet openings 11 are provided in the form of an annular gap through which the gas from a between the nozzle insert 4th and the outer wall of the housing 2 lying pre-chamber 16 is sucked. The pre-chamber 16 is fluidically (pneumatically) connected to the gas valve, so that the negative pressure generated by the Venturi nozzle 3, the open position of the gas valve and thus controls the delivered gas quantity. The nozzle insert 4 has bulges 15 extending in the axial direction, along which the gas inflow takes place. The embodiment shown is directed to gas appliances with relatively high heat outputs, in which relatively small amounts of combustion air and gas are promoted.

Fig. 2 zeigt eine Ausführung der Mischvorrichtung 1 für geringere Leistungen, bei denen die Durchströmungsquerschnittsfläche Q der Venturidüse 3 verringert ist, um im Bereich der Gaseinlassöffnungen 11 ausreichend hohe Strömungsgeschwindigkeiten zu gewährleisten. In das Gehäuse 2 der Mischvorrichtung 1 ist ein Düseneinsatz 4 eingesetzt, in dessen Inneren, im Zentrum der Durchströmungsquerschnittsfläche Q, ein Verdrängerkörper 5 ausgebildet ist, der sich über 90 % der axialen Länge des Düseneinsatzes 4 erstreckt. Der Verdrängerkörper 5 ist ein Hohlkörper, dessen stromabwärts liegendes axiales Ende 8 offen ist. Stromaufwärts erstreckt sich der Verdrängerkörper 5 über das axiale Ende des Düseneinsatzes 4 hinaus und ist in dem vorstehenden Bereich 17 spitz zulaufend ausgebildet, um eine Aufteilung sowie ein frühzeitiges Anliegen der Strömung an dem Verdrängerkörper 5 sowie den Innenwänden des Düseneinsatzes 4 zu gewährleisten. Im Übergangsbereich 10 hat der Verdrängerkörper 5 seinen maximalen Durchmesser erreicht, um im Bereich des geringsten Querschnitts der Venturidüse 3 die maximale Strömungsgeschwindigkeit zu realisieren. Die gezeigte axiale Erstreckung des Verdrängerkörpers 5 ermöglicht einen größtmöglichen Druckrückgewinn im sich in Strömungsrichtung S erweiternden Auslassabschnitt 13 des Düseneinsatzes 4 der Venturidüse 3. Das stromabwärts liegende axiale Ende 8 des Verdrängerkörpers 5 ist von dem stromabwärts liegenden axialen Ende 14 des Düseneinsatzes 4 beabstandet. Der in das Gehäuse 2 von der axial offenen stromabwärtigen Seite eingesetzte Düseneinsatz 4 liegt an seinem stromabwärts liegenden Randbereich 20 formschlüssig an dem Gehäuse 2 und dem Gebläsegehäuse 9 dichtend an, wobei das Gehäuse 2 zusammen mit dem Düseneinsatz 4 an dem Gebläsegehäuse 9 befestigt ist. Fig. 2 shows an embodiment of the mixing device 1 for lower power, in which the flow cross-sectional area Q of the Venturi nozzle 3 is reduced in order to ensure sufficiently high flow velocities in the region of the gas inlet openings 11. In the housing 2 of the mixing device 1, a nozzle insert 4 is inserted, in the interior, in the center of the flow cross-sectional area Q, a displacement body 5 is formed, which extends over 90% of the axial length of the nozzle insert 4. The displacer 5 is a hollow body whose downstream axial end 8 is open. Upstream, the displacer 5 extends beyond the axial end of the nozzle insert 4 and is tapered in the projecting portion 17 to ensure a division and early concern of the flow to the displacer 5 and the inner walls of the nozzle insert 4. In the transition region 10, the displacer 5 has reached its maximum diameter in order to realize the maximum flow velocity in the region of the smallest cross section of the Venturi nozzle 3. The axial extent of the displacement body 5 shown allows the greatest possible pressure recovery in the direction of flow S expanding outlet portion 13 of the nozzle insert 4 of the venturi 3. The downstream axial end 8 of the displacer 5 is spaced from the downstream axial end 14 of the nozzle insert 4. The nozzle insert 4 inserted into the housing 2 from the axially open downstream side sealingly abuts the housing 2 and the blower housing 9 at its downstream edge region 20, the housing 2 being fastened to the blower housing 9 together with the nozzle insert 4.

In Fig. 3 ist der in Fig. 2 dargestellte Düseneinsatz 4 perspektivisch gezeigt, wobei zu erkennen ist, dass der Verdrängerkörper 5 mittels senkrechter Stege 12 im Zentrum der Strömung gehalten ist.In Fig. 3 is the in Fig. 2 shown nozzle insert 4, wherein it can be seen that the displacement body 5 is held by means of vertical webs 12 in the center of the flow.

Sämtliche gezeigten Ausführungsbeispiele sind bis auf die beschriebenen und den Zeichnungen unmittelbar zu entnehmenden Unterschiede identisch. Das Gehäuse 2 und das Gebläsegehäuse 9 sind aus Aluminium im Aluminium-Druckgussverfahren, der Düseneinsatz 4 aus Kunststoff im Spritzgussverfahren hergestellt.All embodiments shown are identical except for the described and the drawings directly to be taken differences. The housing 2 and the fan housing 9 are made of aluminum in the die-cast aluminum process, the nozzle insert 4 made of plastic by injection molding.

Die Erfindung beschränkt sich nicht auf die vorstehend angegebenen bevorzugten Ausführungsbeispiele. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch macht. Beispielsweise kann auch die in Fig. 1 gezeigte Ausführung mit einem an dem Gebläsegehäuse 9 befestigten zusätzlichen Gehäuse 2 realisiert werden. Auch kann vorgesehen sein, das Gehäuse 2 aus Kunststoff herzustellen, wenn das Gasventil nicht unmittelbar daran befestigt werden soll. Da Kunststoff seine Materialeigenschaften über die Lebensdauer des Gasheizgeräts verändert und nicht die erforderliche Sicherheit gewährleistet, kann vorgesehen sein, dass das Gehäuse 2 nach einer vorbestimmten Nutzungsdauer getauscht wird.The invention is not limited to the preferred embodiments specified above. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use. For example, the in Fig. 1 shown embodiment can be realized with an attached to the blower housing 9 additional housing 2. It can also be provided to produce the housing 2 made of plastic, if the gas valve is not to be attached directly thereto. Since plastic changes its material properties over the life of the gas heater and does not ensure the required safety, it can be provided that the housing 2 is replaced after a predetermined period of use.

Claims (10)

  1. Mixing device for mixing combustion air and gas for a gas appliance, having
    a. a housing (2) with a gas supply connectable to it,
    b. a nozzle insert (4) which is interchangeably arranged in the housing (2) and has a predetermined flow through cross-sectional area (Q),
    c. wherein the housing (2) has an inlet region (6) which forms an inlet section (7) of a venturi nozzle (3) tapering in the flow direction,
    d. wherein the nozzle insert (4) forming at least one outlet section (13) of the venturi nozzle (3) widening in the flow direction, wherein
    e. a displacement body (5) extending over a predetermined axial length and reducing the flow through cross-sectional area (Q) is formed inside the nozzle insert (4), characterized in that
    f. the displacement body (5) is held in the centre of the flow cross-sectional area by means of vertical webs (12), and
    g. the nozzle insert (4) is fastened to its downstream edge region (20) in a sealing manner on the housing (2) at least in sections positively adjacent.
  2. Mixing device according to at least one of the preceding claims, characterized in that the inlet region (6) extends in the flow direction up to the smallest cross-section of the venturi nozzle (3).
  3. Mixing device according to at least one of the preceding claims, characterized in that a transition (10) of the inlet region (6) to the nozzle insert (4) forms the smallest cross-section of the Venturi nozzle (3).
  4. Mixing device according to at least one of the preceding claims, characterized in that the displacement body (5) projects upstream beyond the axial end of the nozzle insert (4) and is formed tapering in the projecting region (17).
  5. Mixing device according to at least one of the preceding claims, characterized in that the displacement body (5) is a hollow body whose downstream axial end (8) is open.
  6. Mixing device according to at least one of the preceding claims, characterized in that the displacement body (5) extends over 70-90% of the axial length of the nozzle insert (4).
  7. Mixing device according to at least one of the preceding claims 5 and 6, characterized in that the downstream axial end (8) of the displacement body (5) is spaced from a downstream axial end (14) of the nozzle insert (4).
  8. Mixing device according to at least one of the preceding claims, characterized in that the housing (2) is integrally formed having a blower housing (9) of a blower.
  9. Mixing device according to claim 3, characterized in that at least one gas inlet opening (11) is provided at the transition (10).
  10. Mixing device according to at least one of the previous claims, characterized in that the housing (2) is made of aluminium and the nozzle insert (4) is made of plastic.
EP12705644.8A 2011-03-15 2012-02-15 Mixing device for mixing combustion air and gas for a gas appliance Active EP2686609B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011014117A DE102011014117A1 (en) 2011-03-15 2011-03-15 Mixing device for mixing combustion air and gas for a gas appliance
PCT/EP2012/052605 WO2012123207A2 (en) 2011-03-15 2012-02-15 Mixing device for mixing combustion air and gas for a gas appliance

Publications (2)

Publication Number Publication Date
EP2686609A2 EP2686609A2 (en) 2014-01-22
EP2686609B1 true EP2686609B1 (en) 2019-04-03

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Application Number Title Priority Date Filing Date
EP12705644.8A Active EP2686609B1 (en) 2011-03-15 2012-02-15 Mixing device for mixing combustion air and gas for a gas appliance

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EP (1) EP2686609B1 (en)
DE (1) DE102011014117A1 (en)
TR (1) TR201906191T4 (en)
WO (1) WO2012123207A2 (en)

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EP3064778B1 (en) * 2015-03-06 2022-02-16 ELICA S.p.A. Radial fan with air-gas mixing arrangement
DE102016113588A1 (en) * 2016-07-22 2018-01-25 Ebm-Papst Landshut Gmbh Gas-air mixing device
DE102018128255A1 (en) * 2018-11-12 2020-05-14 Ebm-Papst Landshut Gmbh Blower device
DE102019109369A1 (en) * 2019-04-09 2020-10-15 Ebm-Papst Landshut Gmbh Adapter device designed to be attached to a suction opening of a gas blower
DE102019112645A1 (en) * 2019-05-14 2020-11-19 Ebm-Papst Landshut Gmbh Inflow device for a gas blower
DE102019115741A1 (en) * 2019-06-11 2020-12-17 Ebm-Papst Landshut Gmbh Stiffened fan housing part for arrangement on a gas fan
GB2606376A (en) * 2021-05-05 2022-11-09 Bosch Thermotechnology Ltd Uk Venturi-type mixing nozzle and combustion device with a Venturi-type mixing nozzle

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Also Published As

Publication number Publication date
WO2012123207A3 (en) 2013-12-12
DE102011014117A1 (en) 2012-09-20
EP2686609A2 (en) 2014-01-22
WO2012123207A2 (en) 2012-09-20
TR201906191T4 (en) 2019-05-21

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