EP2604921B1 - Auxiliary ventilation device for an exhaust gas line of a fireplace and an exhaust gas line provided with such an auxiliary ventilation device, in particular an external exhaust gas line - Google Patents

Auxiliary ventilation device for an exhaust gas line of a fireplace and an exhaust gas line provided with such an auxiliary ventilation device, in particular an external exhaust gas line Download PDF

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Publication number
EP2604921B1
EP2604921B1 EP20120196462 EP12196462A EP2604921B1 EP 2604921 B1 EP2604921 B1 EP 2604921B1 EP 20120196462 EP20120196462 EP 20120196462 EP 12196462 A EP12196462 A EP 12196462A EP 2604921 B1 EP2604921 B1 EP 2604921B1
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EP
European Patent Office
Prior art keywords
secondary air
air intake
exhaust gas
gas line
air device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP20120196462
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German (de)
French (fr)
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EP2604921A1 (en
Inventor
Dirk Böhringer
Simon Wolz
Eberhard Stiehler
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Kutzner and Weber GmbH
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Kutzner and Weber GmbH
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Publication of EP2604921A1 publication Critical patent/EP2604921A1/en
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Publication of EP2604921B1 publication Critical patent/EP2604921B1/en
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    • 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
    • F23L11/00—Arrangements of valves or dampers after the fire
    • F23L11/02—Arrangements of valves or dampers after the fire for reducing draught by admission of air to flues
    • 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
    • F23L13/00—Construction of valves or dampers for controlling air supply or draught
    • F23L13/02—Construction of valves or dampers for controlling air supply or draught pivoted about a single axis but having not other movement

Definitions

  • the present invention relates to a secondary air device for a combustion system having an exhaust system with an exhaust pipe, wherein the secondary air device comprises a connected to the exhaust pipe side air inlet nozzle with a secondary air inlet opening and one of the secondary air inlet opening as a variable closure element associated flap, the flap mutually opposite flap sides and configured to adjust the opening width of the sub-air inlet opening in dependence on the difference between the pressures on the opposite flap sides, wherein the sub-air inlet port has an outer-side sub-air inlet chamber area adjoining the sub-air inlet opening communicating with the outside environment of the sub-air device for introducing sub-air is closed, wherein the secondary air inlet chamber area on the outer side of the side air inlet nozzle i closed st.
  • exhaust pipe also includes a chimney or chimney.
  • the state of the art can eg on the DE 40 39 676 C1 , the DE 195 29 010 A1 or the EP 1 479 972 A1 to get expelled.
  • the flap is usually one horizontal Pivot axis between a closed position and open positions pivotally mounted, adjustable by a setting weight in their flap flap, which passes when exceeding a certain difference between the pressure in the outer space and the pressure in the interior of the exhaust pipe in an open position to outside air as secondary air through the secondary air inlet opening in the Inlet pipe to flow.
  • the secondary air devices usually have a short tubular frame which is attached to the exhaust pipe in the form of a secondary air inlet nozzle.
  • the secondary air inlet opening and the flap are arranged in or on the secondary air inlet pipe so that they are exposed to the outside at the front side of the secondary air inlet nozzle.
  • One from the EP 1 479 972 A1 known secondary air device which discloses the preamble of claim 1, has on the outside end side of the secondary air inlet nozzle a cover which is to prevent access to the flap and thus improper manipulation of the flap setting by unauthorized persons.
  • the air supply to the flap and the secondary air opening is effected by a arranged on the circumference of the secondary air inlet and radially in the side opening channel.
  • the present invention has for its object to provide a secondary air device of the type mentioned above, which works reliably even when operating outside on an externally mounted exhaust pipe under the influence of wind.
  • a secondary air device with the features of claim 1 is proposed, wherein the secondary air device comprises a Venturiströmungskanal lying outside the Mau Kunststoffeinlasshunt Schemes with an open to the outside of the secondary air device channel input, a channel output and a bottleneck between the channel input and the channel output wherein the Venturi flow channel is connected at its bottleneck via at least one communication opening with the secondary air inlet chamber area.
  • Venturi flow channel in the present application denotes a channel, which is exposed on the input side of the external environment, so that with increased wind and pressure build-up at the entrance of Venturiströmungskanals there is a flow that leads to a reduction in pressure in the region of bottleneck according to the known Venturi effect. Due to the communication of this bottleneck of Venturiströmungskanals with the Maulufteinlasshunt Scheme it comes in the latter to a pressure reduction effect at sufficiently strong flow in the Venturi flow channel. This pressure reduction effect compensates at least partially in the secondary air inlet chamber area for any back pressure caused by wind, so that the flap is not overridden in its control behavior by such a back pressure in the undesired manner known from the prior art.
  • the Venturi flow channel is a flared at both axial ends annular channel with a circumferentially provided on the circumference of the Maulufteinlassstutzens annular channel cross-section, wherein the channel entrance and the channel exit to the opposite axial ends of the annular channel lie.
  • Such an embodiment of the secondary air device according to the invention can be realized here particularly in that the Venturi flow channel is radially inwardly bounded by the outer periphery of the Maulufteinlassstutzens - and radially outside of a reifförmigen sheet metal ring which is coaxial with the Maulufteinlaufstutzen arranged around it.
  • Venturiströmungskanals can be easily realized by the fact that the sheet metal ring is flared on both sides conically at its axial ends, so that the lying between the widening axial region of the sheet metal ring with the outside of the peripheral wall of the secondary air inlet nozzle forms the Venturi bottleneck.
  • the secondary air inlet nozzle has a plurality of communication openings distributed over its circumference, which lie in a common cross-sectional plane with the bottleneck of the venturi flow channel and the latter connect to the secondary air inlet chamber area.
  • These communication ports serve both to connect the sub-air inlet chamber area to the outside environment of the sub-air device, via the venturi flow channel, as well as to possibly depressurize the sub-air inlet chamber area in the event of increased venturi flow in the venturi flow channel when exposed to wind.
  • the secondary air inlet chamber region is closed toward the outside, so that the flap and the secondary air inlet opening on the front side of the secondary air inlet nozzle are not exposed and thus also not exposed to direct exposure to wind.
  • the radially outer wall of Venturiströmungskanals covers the communication openings radially outside.
  • the secondary air inlet port and the venturi flow passage are surrounded by a perforated, annular outer shield radially outward, the Venturi flow passage is parallel to the axis of the Mau Kunststoffeinlassstutzens and open with its channel entrance to the outer end side of the Maulufteinlassstutzens.
  • the secondary air device is prefabricated to be connected to an exhaust pipe assembly and accordingly ready for operation after connection to the exhaust pipe without further notable precautions.
  • the invention also provides an exhaust pipe with a secondary air device according to the invention.
  • a secondary air device is preferably provided on an outer area of a building and has an outer portion on which the secondary air device is arranged.
  • the secondary air device is expediently arranged on the exhaust pipe, that the channel entrance of Venturiströmungskanals facing away from a respective connected to the exhaust pipe (chimney) next building wall to the outside.
  • the outdoor fireplace 2 extends vertically along a building wall 4 upwards.
  • the external chimney 2 is connected to a fireplace (not shown) in the building via an intermediate gas pipe 6 passing through the building wall 4, so that the exhaust gas pipe 6 can discharge exhaust gas from the fireplace to the outdoor chimney 2.
  • the normal exhaust gas flow is in FIG. 1 indicated by arrows 7.
  • An auxiliary air device 10 is connected to a connecting opening 8 of the outside chimney 2, which is located below the junction of the exhaust gas intermediate line 6 formed as a connecting piece and which faces away from the building wall 4 in the example. It comprises a circular-cylindrical auxiliary air inlet pipe 12 in the example, which is attached directly to the connection opening 8 and connected to the outer chimney 2. On its outer end side 14 of the secondary air inlet 12 is closed by a wall 16.
  • a control flap 18 is pivotally mounted about an upper horizontal hinge axis 20.
  • the control flap 18 serves as a variable closure element of a secondary air inlet opening 22 of the secondary air device 10.
  • the secondary air inlet opening 22 is located in a cross-sectional plane 26 of the secondary air inlet nozzle 12 that is orthogonal to the axis 24 of the secondary air inlet nozzle 12 and also contains the horizontal hinge axis 20.
  • the control valve 18 is adapted to adjust the opening width of the secondary air inlet opening 22 as a function of the difference between the pressures on the side facing away from the fireplace 2 flap side 28 and the fireplace 2 facing inner flap side 30 and a setting weight 32 is used to specify a specific response of the control valve 18th
  • the sub-air inlet port 12 has an outer-side sub-air inlet chamber portion 34 that is externally adjacent to the sub-air inlet port 22 and that extends over the entire cross-section of the sub-air inlet port 12 and is covered by the wall 16 to the outside.
  • the secondary air inlet pipe 12 further has, in a cross-sectional plane 35 parallel to the plane 26 of the secondary air inlet opening 22, a plurality of elongated holes 36 distributed uniformly around the circumference of the secondary air inlet pipe 12 as communication openings to the outside. In normal operation, in the in FIG. 1 indicated by the arrow 13 flow outside air to the secondary air inlet opening 22 and possibly further into the chimney 2.
  • This sheet metal ring 38 Concentric with the axis 24 of the secondary air inlet nozzle 12, it is surrounded by a reef-shaped sheet metal ring 38 in the region of the plane 35.
  • This sheet metal ring 38 has conical widenings 40 at its axial ends and, together with the secondary air inlet pipe 12, defines an annular channel 42 with a constriction 44 between the conical widenings 40.
  • This annular channel 42 forms a Venturi flow channel with a channel inlet 46 open at the front side 14 of the secondary air inlet pipe 12 and an axially opposite channel exit 48.
  • the communication openings 36 provide communication between the throat 44 of the venturi flow channel 42 and the secondary air inlet chamber area 34.
  • the Venturiströmungskanal 42 Under normal conditions, ie in calm or low wind, the Venturiströmungskanal 42 has no significant effect on the control behavior of the secondary air device 10. In stronger windfall (in FIG. 1 represented by the arrow 43) and thus possibly associated back pressure in the outer region of the secondary air device 10, an air flow through the Venturiströmungskanal 42 can build through, as shown in FIG. 1 in the upper region of the Venturiströmungskanals 42 by means of flow arrows 45 is indicated by way of example, wherein there is a pressure reduction in the Venturiströmungskanal 42 in the region of the constriction 44, which also affects the Maulufteinlasshunt Scheme 34 via the communication openings 36 to the aforementioned dynamic effects at least partially compensate.
  • the control valve 18 is therefore not overridden in an undesirable manner by wind influences in their control behavior.
  • FIG. 2a shows in a partial sectional view of a double-walled tubular element 49 for a double-walled stainless steel chimney with a lateral branch 50 for connecting the in FIG. 2b shown in partial section secondary air device 10 according to the invention.
  • components 49 and 10 are components of a plug-in system, wherein the secondary air device 10 can be plugged with the sleeve portion 52 on the plug portion 54 of the branch 50 to connect the two components 10, 49 together.
  • the secondary air device 10 is an already ready to connect unit. It comprises the secondary air inlet 12, which is closed at its outer end face 14 with the wall 16 and an orthogonal to its axis 24 extending intermediate wall 58, in which the secondary air inlet opening 22 is provided as a central cutout. At the upper edge of the secondary air inlet opening 22 is the joint 21 of the control flap 18 with the pivot axis 20.
  • the adjustment weight 32 is a screw nut which sits on the threaded rod 60 and can be screwed closer to the pivot axis 20 or removed by screwing it off to the Set response of the damper 18.
  • the flap 18 goes into the open position by, as shown in FIG. 2b from the substantially vertical closure position in the clockwise direction inwardly toward sleeve portion 52 pivots.
  • the venturi flow passage 42 is an annular passage 42 defined by the outer circumference of the sub-air intake port 12 and the inner circumference of a reef-shaped sheet ring 38, extending in the direction of the axis 24 and having the flared portions 40 at its axial ends.
  • Well recognizable in FIG. 2b is the constriction 44 of Venturiströmungskanals 42 between the two flared portions 40. This constriction 44 communicates via the communication openings 36 with the secondary air inlet chamber portion 34 in connection.
  • the communication openings 36 are narrower than the sheet metal ring 38, so that the latter covers the communication openings 36 radially outward with a radial distance.
  • the sub-air inlet port 12 is surrounded by a plurality of holes 62 perforated fender ring 64 over the length of its Mau Kunststoffeincrohuntsch Society 34 and the metal ring 38, which holds the sheet-metal ring 38 in the correct axial position, so that the bottleneck 44 in the plane 35 of the communication openings 36th is positioned.
  • venturi flow channel 42 In the region of the end face 14, the venturi flow channel 42 is open for an inlet of wind flow at its channel inlet 40.
  • the effluent at the channel exit 48 from the Venturiströmungskanal 42 air can flow through the holes 62 of the fender ring 64 to the outside.

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

Description

Die vorliegende Erfindung betrifft eine Nebenluftvorrichtung für eine Feuerungsanlage, die eine Abgasanlage mit einer Abgasleitung aufweist, wobei die Nebenluftvorrichtung einen mit der Abgasleitung zu verbindenden oder verbundenen Nebenlufteinlassstutzen mit einer Nebenlufteinlassöffnung und einer der Nebenlufteinlassöffnung als variables Verschlusselement zugeordneten Klappe umfasst, wobei die Klappe einander entgegengesetzte Klappenseiten aufweist und dazu eingerichtet ist, die Öffnungsweite der Nebenlufteinlassöffnung in Abhängigkeit von der Differenz zwischen den Drücken an den entgegengesetzten Klappenseiten einzustellen, wobei der Nebenlufteinlassstutzen einen außen an die Nebenlufteinlassöffnung angrenzenden, außenendseitigen Nebenlufteinlasskammerbereich aufweist, der mit der Außenumgebung der Nebenluftvorrichtung zum Einlass von Nebenluft in Verbindung steht, wobei der Nebenlufteinlasskammerbereich an der Au-ßenstirnseite des Nebenlufteinlassstutzens geschlossen ist.The present invention relates to a secondary air device for a combustion system having an exhaust system with an exhaust pipe, wherein the secondary air device comprises a connected to the exhaust pipe side air inlet nozzle with a secondary air inlet opening and one of the secondary air inlet opening as a variable closure element associated flap, the flap mutually opposite flap sides and configured to adjust the opening width of the sub-air inlet opening in dependence on the difference between the pressures on the opposite flap sides, wherein the sub-air inlet port has an outer-side sub-air inlet chamber area adjoining the sub-air inlet opening communicating with the outside environment of the sub-air device for introducing sub-air is closed, wherein the secondary air inlet chamber area on the outer side of the side air inlet nozzle i closed st.

Nebenluftvorrichtungen der vorstehend genannten Art sind in diversen Ausgestaltungen bekannt und dienen dazu, den Kaminzug der Abgasanlage bzw. eines damit verbundenen Abgaskamins zu begrenzen. In der Terminologie der vorliegenden Anmeldung umfasst der Begriff Abgasleitung auch einen Kamin oder Schornstein.Secondary air devices of the aforementioned type are known in various configurations and serve to limit the chimney draft of the exhaust system or an associated exhaust stack. In the terminology of the present application, the term exhaust pipe also includes a chimney or chimney.

Zum Stand der Technik kann z.B. auf die DE 40 39 676 C1 , die DE 195 29 010 A1 oder die EP 1 479 972 A1 verwiesen werden.The state of the art can eg on the DE 40 39 676 C1 , the DE 195 29 010 A1 or the EP 1 479 972 A1 to get expelled.

Bei der Klappe handelt es sich üblicherweise um eine um eine horizontale Schwenkachse zwischen einer Verschlussstellung und Öffnungsstellungen schwenkbar gelagerte, durch ein Einstellgewicht in ihrem Ansprechverhalten einstellbare Klappe, die bei Überschreiten einer bestimmten Differenz zwischen dem Druck im Außenraum und dem Druck im Innenraum der Abgasleitung in eine Öffnungsstellung übergeht, um Außenluft als Nebenluft durch die Nebenlufteinlassöffnung in die Abgasleitung einströmen zu lassen. Je stärker der durch den Kaminzug erzeugte Unterdruck in der Abgasleitung ist, desto mehr Nebenluft wird durch die auch als Zugregler bezeichnete Nebenluftvorrichtung in die Abgasleitung eingelassen, um den Zug zu begrenzen.The flap is usually one horizontal Pivot axis between a closed position and open positions pivotally mounted, adjustable by a setting weight in their flap flap, which passes when exceeding a certain difference between the pressure in the outer space and the pressure in the interior of the exhaust pipe in an open position to outside air as secondary air through the secondary air inlet opening in the Inlet pipe to flow. The stronger the negative pressure in the exhaust gas line produced by the chimney draft, the more secondary air is introduced into the exhaust gas line by the secondary air device, also referred to as draft regulator, in order to limit the draft.

Die Nebenluftvorrichtungen haben üblicherweise einen kurzen rohrartigen Rahmen, welcher in Form eines Nebenlufteinlassstutzens an der Abgasleitung angebracht ist. Üblicherweise sind die Nebenlufteinlassöffnung und die Klappe so in oder an dem Nebenlufteinlassstutzen angeordnet, dass sie nach außen hin an der Stirnseite des Nebenlufteinlassstutzens frei liegen.The secondary air devices usually have a short tubular frame which is attached to the exhaust pipe in the form of a secondary air inlet nozzle. Usually, the secondary air inlet opening and the flap are arranged in or on the secondary air inlet pipe so that they are exposed to the outside at the front side of the secondary air inlet nozzle.

Eine aus der EP 1 479 972 A1 bekannte Nebenluftvorrichtung, welche den Oberbegriff des Anspruchs 1 offenbart, hat an der außenseitigen Stirnseite des Nebenlufteinlassstutzens eine Abdeckung, die einen Zugriff auf die Klappe und somit eine unsachgemäße Manipulation der Klappeneinstellung durch nichtauthorisierte Personen verhindern soll. Die Luftzuführung zur Klappe und zur Nebenluftöffnung erfolgt durch einen am Umfang des Nebenlufteinlassstutzens angeordneten und radial darin einmündenden Seitenkanal.One from the EP 1 479 972 A1 known secondary air device, which discloses the preamble of claim 1, has on the outside end side of the secondary air inlet nozzle a cover which is to prevent access to the flap and thus improper manipulation of the flap setting by unauthorized persons. The air supply to the flap and the secondary air opening is effected by a arranged on the circumference of the secondary air inlet and radially in the side opening channel.

Im Zuge der Modernisierung von Heizungsanlagen oder auch aus architektonisch gestalterischen Gründen sind in jüngerer Vergangenheit zahlreiche Außenkamine und insbesondere zahlreiche einwandige oder doppelwandige Edelstahlkamine an Außenwänden von Gebäuden montiert worden, wobei diese Kamine häufig auch mit einer ebenfalls draußen angeordneten Nebenluftvorrichtung der eingangs genannten Art ausgestattet worden sind. Beim Betrieb solcher Abgaskamine an einer Feuerstätte kam es gelegentlich vor, dass durch unmittelbare Beaufschlagung der Klappe an der Nebenlufteinlassöffnung oder aufgrund eines erhöhten, durch Wind verursachten Staudrucks im Außenbereich der Nebenluftvorrichtung die Klappe in eine extreme Öffnungsstellung bewegt wurde, so dass sich auch in der Abgasleitung ein erhöhter Druck aufbauen konnte, der ein effizientes Abströmen der Abgase durch die Abgasleitung nach außen gestört und unterbunden - oder gar zu einer Strömungsumkehr der Abgase in Richtung zur Feuerstätte geführt hat. Dadurch wurde der Brennbetrieb der Feuerstätte gestört und es kam gelegentlich vor, dass Abgase in den Aufstellraum der Feuerstätte gelangt sind.In the course of modernization of heating systems or architectural design reasons numerous outdoor fireplaces and in particular numerous single-walled or double-walled stainless steel fireplaces have been mounted on exterior walls of buildings in the recent past, these chimneys often have been equipped with a likewise arranged outside auxiliary air device of the type mentioned , Occasionally, when operating such flue stacks on a fireplace, it has been found that by direct impingement of the flap on the secondary air inlet or due to increased wind pressure caused by wind in the outer region of the secondary air device, the flap has been moved to an extreme open position, so that an increased pressure could build up in the exhaust pipe, which disturbed an efficient outflow of exhaust gases through the exhaust pipe to the outside and prevented - or even to a flow reversal of the exhaust gases in the direction led to the fireplace. As a result, the burning operation of the fireplace was disturbed and it occasionally happened that exhaust gases have got into the boiler room of the fireplace.

Die durch eine Abdeckung geschützte Regelklappe der aus der EP 1 479 972 A1 bekannten Nebenluftvorrichtung wäre im Falle der Außenmontage durch unmittelbare Beaufschlagung durch Wind oder Sturm geschützt. Allerdings würde ein sich durch Wind erzeugter Staudruck durch den radialen Seitenkanal hindurch auch an der Regelklappe aufbauen und deren Soll-Regelverhalten übersteuern, so dass es ebenfalls zu den vorstehend erwähnten Störeffekten beim Betrieb einer mit der Nebenluftvorrichtung nach der EP 1 479 972 A1 ausgerüsteten Abgasleitung an einer Feuerstätte kommen kann.The protected by a cover flap of the EP 1 479 972 A1 known secondary air device would be protected in the case of outdoor installation by direct exposure to wind or storm. However, a generated by wind back pressure through the radial side channel would also build on the control valve and override their target control behavior, so that it also to the above-mentioned effects in the operation of a with the secondary air device after EP 1 479 972 A1 equipped exhaust pipe can come at a fireplace.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Nebenluftvorrichtung der eingangs genannten Art bereitzustellen, die auch im Betrieb draußen an einer außen montierten Abgasleitung unter Windeinfluss zuverlässig funktioniert.The present invention has for its object to provide a secondary air device of the type mentioned above, which works reliably even when operating outside on an externally mounted exhaust pipe under the influence of wind.

Zur Lösung dieser Aufgabe wird eine Nebenluftvorrichtung mit den Merkmalen des Anspruchs 1 vorgeschlagen, wobei diese dadurch gekennzeichnet ist, dass die Nebenluftvorrichtung einen außerhalb des Nebenlufteinlasskammerbereichs liegenden Venturiströmungskanal mit einem zur Außenumgebung der Nebenluftvorrichtung offenen Kanaleingang, einem Kanalausgang und einer Engstelle zwischen dem Kanaleingang und dem Kanalausgang aufweist, wobei der Venturiströmungskanal an seiner Engstelle über wenigstens eine Kommunikationsöffnung mit dem Nebenlufteinlasskammerbereich verbunden ist.To achieve this object, a secondary air device with the features of claim 1 is proposed, wherein the secondary air device comprises a Venturiströmungskanal lying outside the Nebenlufteinlasskammerbereichs with an open to the outside of the secondary air device channel input, a channel output and a bottleneck between the channel input and the channel output wherein the Venturi flow channel is connected at its bottleneck via at least one communication opening with the secondary air inlet chamber area.

Mit Venturiströmungskanal ist in der vorliegenden Anmeldung ein Kanal bezeichnet, welcher eingangsseitig der Außenumgebung ausgesetzt ist, so dass bei erhöhtem Windaufkommen und Druckaufbau am Eingang des Venturiströmungskanals darin eine Strömung entsteht, die im Bereich der Engstelle zu einer Druckminderung entsprechend dem bekannten Venturieffekt führt. Aufgrund der Kommunikation dieser Engstelle des Venturiströmungskanals mit dem Nebenlufteinlasskammerbereich kommt es auch in Letzterem zu einem Druckminderungseffekt bei hinreichend starker Strömung im Venturiströmungskanal. Dieser Druckminderungseffekt kompensiert zumindest teilweise in dem Nebenlufteinlasskammerbereich einen etwaigen außen durch Wind verursachten Staudruck, so dass die Klappe von einem solchen Staudruck nicht in der aus dem Stand der Technik bekannten unerwünschten Weise in ihrem Regelverhalten übersteuert wird.Venturi flow channel in the present application denotes a channel, which is exposed on the input side of the external environment, so that with increased wind and pressure build-up at the entrance of Venturiströmungskanals there is a flow that leads to a reduction in pressure in the region of bottleneck according to the known Venturi effect. Due to the communication of this bottleneck of Venturiströmungskanals with the Nebenlufteinlasskammerbereich it comes in the latter to a pressure reduction effect at sufficiently strong flow in the Venturi flow channel. This pressure reduction effect compensates at least partially in the secondary air inlet chamber area for any back pressure caused by wind, so that the flap is not overridden in its control behavior by such a back pressure in the undesired manner known from the prior art.

Ein besonders einfacher und dennoch in der gewünschten Weise wirkungsvoller Aufbau der Nebenluftvorrichtung nach der Erfindung ist möglich, wenn der Venturiströmungskanal ein an beiden axialen Enden aufgeweiteter Ringkanal mit einem am Umfang des Nebenlufteinlassstutzens umlaufend vorgesehenen ringförmigen Kanalquerschnitt ist, wobei der Kanaleingang und der Kanalausgang an den entgegengesetzten axialen Enden des Ringkanals liegen. Eine solche Ausführungsform der Nebenluftvorrichtung nach der Erfindung lässt sich hier insbesondere dadurch leicht realisieren, dass der Venturiströmungskanal radial innenseitig von dem Außenumfang des Nebenlufteinlassstutzens - und radial außenseitig von einem reifförmigen Blechring begrenzt ist, der koaxial zu dem Nebenlufteinlassstutzen um diesen herum angeordnet ist. Die Engstelle des Venturiströmungskanals kann leicht dadurch realisiert werden, dass der Blechring an seinen axialen Enden beidseitig konisch aufgeweitet ist, so dass der zwischen den Aufweitungen liegende axiale Bereich des Blechrings mit der Außenseite der Umfangswand des Nebenlufteinlassstutzens die Venturi-Engstelle bildet.A particularly simple and yet effective in the desired manner construction of the secondary air device according to the invention is possible if the Venturi flow channel is a flared at both axial ends annular channel with a circumferentially provided on the circumference of the Nebenlufteinlassstutzens annular channel cross-section, wherein the channel entrance and the channel exit to the opposite axial ends of the annular channel lie. Such an embodiment of the secondary air device according to the invention can be realized here particularly in that the Venturi flow channel is radially inwardly bounded by the outer periphery of the Nebenlufteinlassstutzens - and radially outside of a reifförmigen sheet metal ring which is coaxial with the Nebenlufteinlaufstutzen arranged around it. The constriction of Venturiströmungskanals can be easily realized by the fact that the sheet metal ring is flared on both sides conically at its axial ends, so that the lying between the widening axial region of the sheet metal ring with the outside of the peripheral wall of the secondary air inlet nozzle forms the Venturi bottleneck.

Vorzugsweise hat der Nebenlufteinlassstutzen mehrere über seinen Umfang verteilte Kommunikationsöffnungen, die in einer gemeinsamen Querschnittsebene mit der Engstelle des Venturiströmungskanals liegen und Letztere mit dem Nebenlufteinlasskammerbereich verbinden. Diese Kommunikationsöffnungen dienen sowohl zur Verbindung des Nebenlufteinlasskammerbereichs mit der Außenumgebung der Nebenluftvorrichtung, und zwar über den Venturiströmungskanal, als auch zur etwaigen Druckabsenkung im Nebenlufteinlasskammerbereich im Falle erhöhter Venturi-Strömung in dem Venturiströmungskanal bei Windbeaufschlagung. Der Nebenlufteinlasskammerbereich ist im Übrigen nach Außen hin geschlossen, so dass die Klappe und die Nebenlufteinlassöffnung an der Stirnseite des Nebenlufteinlassstutzens nicht frei liegen und somit auch nicht unmittelbarer Beaufschlagung durch Wind ausgesetzt sind. Die radial äußere Wand des Venturiströmungskanals überdeckt die Kommunikationsöffnungen radial außen.Preferably, the secondary air inlet nozzle has a plurality of communication openings distributed over its circumference, which lie in a common cross-sectional plane with the bottleneck of the venturi flow channel and the latter connect to the secondary air inlet chamber area. These communication ports serve both to connect the sub-air inlet chamber area to the outside environment of the sub-air device, via the venturi flow channel, as well as to possibly depressurize the sub-air inlet chamber area in the event of increased venturi flow in the venturi flow channel when exposed to wind. Incidentally, the secondary air inlet chamber region is closed toward the outside, so that the flap and the secondary air inlet opening on the front side of the secondary air inlet nozzle are not exposed and thus also not exposed to direct exposure to wind. The radially outer wall of Venturiströmungskanals covers the communication openings radially outside.

Vorzugsweise sind der Nebenlufteinlassstutzen und der Venturiströmungskanal von einem perforierten, ringförmigen Außenschutzblech radial außen umgeben, wobei der Venturiströmungskanal parallel zur Achse des Nebenlufteinlassstutzens verläuft und mit seinem Kanaleingang an der äußeren Stirnseite des Nebenlufteinlassstutzens offen liegt.Preferably, the secondary air inlet port and the venturi flow passage are surrounded by a perforated, annular outer shield radially outward, the Venturi flow passage is parallel to the axis of the Nebenlufteinlassstutzens and open with its channel entrance to the outer end side of the Nebenlufteinlassstutzens.

Vorzugsweise ist die Nebenluftvorrichtung zu einer mit einer Abgasleitung zu verbindenden Baueinheit vorgefertigt und demgemäß nach Anschluss an die Abgasleitung ohne weitere nennenswerte Vorkehrungen betriebsbereit.Preferably, the secondary air device is prefabricated to be connected to an exhaust pipe assembly and accordingly ready for operation after connection to the exhaust pipe without further notable precautions.

Gegenstand der Erfindung ist auch eine Abgasleitung mit einer Nebenluftvorrichtung nach der Erfindung. Eine solche Abgasleitung ist vorzugsweise an einem Außenbereich eines Gebäudes vorgesehen und weist einen außenliegenden Abschnitt auf, an dem die Nebenluftvorrichtung angeordnet ist. Die Nebenluftvorrichtung ist dabei zweckmäßigerweise so an der Abgasleitung angeordnet, dass der Kanaleingang des Venturiströmungskanals von einer betreffenden mit der Abgasleitung (Kamin) verbundenen nächsten Gebäudewand nach außen abgewandt ist.The invention also provides an exhaust pipe with a secondary air device according to the invention. Such an exhaust pipe is preferably provided on an outer area of a building and has an outer portion on which the secondary air device is arranged. The secondary air device is expediently arranged on the exhaust pipe, that the channel entrance of Venturiströmungskanals facing away from a respective connected to the exhaust pipe (chimney) next building wall to the outside.

Ein Ausführungsbeispiel der Erfindung wird nachstehend unter Bezugnahme auf die Figuren näher erläutert.

Figur 1
zeigt in einer schematischen Schnittdarstellung einen als Abgasleitung vorgesehenen Außenkamin (Schornstein) mit einer Nebenluftvorrichtung nach der Erfindung, wobei der Außenkamin über eine Abgaszwischenleitung mit einer in einem Gebäude untergebrachten Feuerstätte verbunden ist.
Figur 2a
zeigt in einer Teilschnittdarstellung ein Abgasleitungselement einer Abgasanlage mit einem seitlichen Abzweig.
Figur 2b
zeigt in einer Teilschnittdarstellung eine als vorgefertigte Baueinheit ausgebildete und an das Abgasleitungselement aus Figur 2a anzuschließende Nebenluftvorrichtung nach der Erfindung im noch von dem Abgasleitungselement getrennten Zustand.
Figur 2c
zeigt eine Draufsicht auf die Nebenluftvorrichtung aus Figur 2b mit Blick auf die außenseitige Stirnseite.
An embodiment of the invention will be explained below with reference to the figures.
FIG. 1
shows a schematic sectional view of an intended as an exhaust pipe outer chimney (chimney) with a secondary air device according to the invention, wherein the outer chimney is connected via an exhaust gas intermediate line with a fireplace housed in a building.
FIG. 2a
shows a partial sectional view of an exhaust pipe element of an exhaust system with a lateral branch.
FIG. 2b
shows in a partial sectional view formed as a prefabricated unit and to the exhaust pipe element FIG. 2a to be connected secondary air device according to the invention in the still separated from the exhaust pipe element state.
Figure 2c
shows a plan view of the secondary air device FIG. 2b overlooking the outside end face.

In der ausschnittsweisen Skizze gemäß Figur 1 erstreckt sich der Außenkamin 2 längs einer Gebäudewand 4 vertikal nach oben. Der Außenkamin 2 ist über eine Abgaszwischenleitung 6, die die Gebäudewand 4 durchsetzt, mit einer Feuerstätte (nicht gezeigt) in dem Gebäude verbunden, so dass die Abgaszwischenleitung 6 Abgas von der Feuerstätte zu dem Außenkamin 2 ableiten kann. Die normale Abgasströmung ist in Figur 1 durch Pfeile 7 angedeutet.In the partial sketch according to FIG. 1 the outdoor fireplace 2 extends vertically along a building wall 4 upwards. The external chimney 2 is connected to a fireplace (not shown) in the building via an intermediate gas pipe 6 passing through the building wall 4, so that the exhaust gas pipe 6 can discharge exhaust gas from the fireplace to the outdoor chimney 2. The normal exhaust gas flow is in FIG. 1 indicated by arrows 7.

An einem im Beispielsfall unterhalb der Einmündung der als Verbindungsstück ausgebildeten Abgaszwischenleitung 6 liegenden und von der Gebäudewand 4 abgewandten Anschlussöffnung 8 des Außenkamins 2 ist eine Nebenluftvorrichtung 10 nach der Erfindung angeschlossen. Sie umfasst einen im Beispielsfall kreiszylindrischen Nebenlufteinlassstutzen 12, der unmittelbar an die Anschlussöffnung 8 angesetzt und mit dem Außenkamin 2 verbunden ist. An seiner Außenstirnseite 14 ist der Nebenlufteinlassstutzen 12 durch eine Wand 16 verschlossen. In dem Nebenlufteinlassstutzen 12 ist eine Regelklappe 18 um eine obere horizontale Gelenkachse 20 schwenkbar gelagert. Die Regelklappe 18 dient als variables Verschlusselement einer Nebenlufteinlassöffnung 22 der Nebenluftvorrichtung 10. Die Nebenlufteinlassöffnung 22 befindet sich in einer zur Achse 24 des Nebenlufteinlassstutzens 12 orthogonalen und auch die horizontale Gelenkachse 20 enthaltenden Querschnittsebene 26 des Nebenlufteinlassstutzens 12.An auxiliary air device 10 according to the invention is connected to a connecting opening 8 of the outside chimney 2, which is located below the junction of the exhaust gas intermediate line 6 formed as a connecting piece and which faces away from the building wall 4 in the example. It comprises a circular-cylindrical auxiliary air inlet pipe 12 in the example, which is attached directly to the connection opening 8 and connected to the outer chimney 2. On its outer end side 14 of the secondary air inlet 12 is closed by a wall 16. In the secondary air inlet 12, a control flap 18 is pivotally mounted about an upper horizontal hinge axis 20. The control flap 18 serves as a variable closure element of a secondary air inlet opening 22 of the secondary air device 10. The secondary air inlet opening 22 is located in a cross-sectional plane 26 of the secondary air inlet nozzle 12 that is orthogonal to the axis 24 of the secondary air inlet nozzle 12 and also contains the horizontal hinge axis 20.

Die Regelklappe 18 ist dazu eingerichtet, die Öffnungsweite der Nebenlufteinlassöffnung 22 in Abhängigkeit von der Differenz zwischen den Drücken an der vom Kamin 2 abgewandten Klappenseite 28 und der dem Kamin 2 zugewandten inneren Klappenseite 30 einzustellen und ein Einstellgewicht 32 dient zur Vorgabe eines bestimmten Ansprechverhaltens der Regelklappe 18.The control valve 18 is adapted to adjust the opening width of the secondary air inlet opening 22 as a function of the difference between the pressures on the side facing away from the fireplace 2 flap side 28 and the fireplace 2 facing inner flap side 30 and a setting weight 32 is used to specify a specific response of the control valve 18th

Der Nebenlufteinlassstutzen 12 hat einen außen an die Nebenlufteinlassöffnung 22 angrenzenden, außenendseitigen Nebenlufteinlasskammerbereich 34, der sich über den gesamten Querschnitt des Nebenlufteinlassstutzens 12 erstreckt und durch die Wand 16 nach außen hin abgedeckt ist. Der Nebenlufteinlassstutzen 12 hat ferner in einer zu der Ebene 26 der Nebenlufteinlassöffnung 22 parallelen Querschnittsebene 35 mehrere gleichmäßig am Umfang des Nebenlufteinlassstutzens 12 verteilte Langlöcher 36 als Kommunikationsöffnungen nach außen. Im normalen Betrieb kann in der in Figur 1 durch den Pfeil 13 angedeuteten Weise Außenluft zur Nebenlufteinlassöffnung 22 und ggf. weiter in den Kamin 2 strömen.The sub-air inlet port 12 has an outer-side sub-air inlet chamber portion 34 that is externally adjacent to the sub-air inlet port 22 and that extends over the entire cross-section of the sub-air inlet port 12 and is covered by the wall 16 to the outside. The secondary air inlet pipe 12 further has, in a cross-sectional plane 35 parallel to the plane 26 of the secondary air inlet opening 22, a plurality of elongated holes 36 distributed uniformly around the circumference of the secondary air inlet pipe 12 as communication openings to the outside. In normal operation, in the in FIG. 1 indicated by the arrow 13 flow outside air to the secondary air inlet opening 22 and possibly further into the chimney 2.

Konzentrisch zur Achse 24 des Nebenlufteinlassstutzens 12 ist dieser im Bereich der Ebene 35 von einem reifförmigen Blechring 38 umgeben. Dieser Blechring 38 weist an seinen axialen Enden konische Aufweitungen 40 auf und begrenzt zusammen mit dem Nebenlufteinlassstutzen 12 einen Ringkanal 42 mit einer Engstelle 44 zwischen den konischen Aufweitungen 40. Dieser Ringkanal 42 bildet einen Venturiströmungskanal mit einer an der Stirnseite 14 des Nebenlufteinlassstutzens 12 offenen Kanaleingang 46 und einen axial entgegengesetzten Kanalausgang 48. Die Kommunikationsöffnungen 36 stellen eine Verbindung zwischen der Engstelle 44 des Venturiströmungskanals 42 und dem Nebenlufteinlasskammerbereich 34 her.Concentric with the axis 24 of the secondary air inlet nozzle 12, it is surrounded by a reef-shaped sheet metal ring 38 in the region of the plane 35. This sheet metal ring 38 has conical widenings 40 at its axial ends and, together with the secondary air inlet pipe 12, defines an annular channel 42 with a constriction 44 between the conical widenings 40. This annular channel 42 forms a Venturi flow channel with a channel inlet 46 open at the front side 14 of the secondary air inlet pipe 12 and an axially opposite channel exit 48. The communication openings 36 provide communication between the throat 44 of the venturi flow channel 42 and the secondary air inlet chamber area 34.

Unter normalen Bedingungen, d.h. bei Windstille oder geringer Windeinwirkung, hat der Venturiströmungskanal 42 keine nennenswerten Auswirkungen auf das Regelverhalten der Nebenluftvorrichtung 10. Bei stärkerem Windeinfall (in Figur 1 durch den Pfeil 43 repräsentiert) und einem damit ggf. einhergehenden Staudruck im Außenbereich der Nebenluftvorrichtung 10 kann sich eine Luftströmung durch den Venturiströmungskanal 42 hindurch aufbauen, wie dies in Figur 1 im oberen Bereich des Venturiströmungskanals 42 anhand von Strömungspfeilen 45 beispielhaft angedeutet ist, wobei es im Bereich der Engstelle 44 zu einer Druckminderung in dem Venturiströmungskanal 42 kommt, die sich über die Kommunikationsöffnungen 36 auch auf den Nebenlufteinlasskammerbereich 34 auswirkt, um die angesprochenen Staudruckeffekte zumindest teilweise zu kompensieren. Die Regelklappe 18 wird daher nicht in einer unerwünschten Weise durch Windeinflüsse in ihrem Regelverhalten übersteuert.Under normal conditions, ie in calm or low wind, the Venturiströmungskanal 42 has no significant effect on the control behavior of the secondary air device 10. In stronger windfall (in FIG. 1 represented by the arrow 43) and thus possibly associated back pressure in the outer region of the secondary air device 10, an air flow through the Venturiströmungskanal 42 can build through, as shown in FIG. 1 in the upper region of the Venturiströmungskanals 42 by means of flow arrows 45 is indicated by way of example, wherein there is a pressure reduction in the Venturiströmungskanal 42 in the region of the constriction 44, which also affects the Nebenlufteinlasskammerbereich 34 via the communication openings 36 to the aforementioned dynamic effects at least partially compensate. The control valve 18 is therefore not overridden in an undesirable manner by wind influences in their control behavior.

Figur 2a zeigt in einer Teilschnittdarstellung ein doppelwandiges Rohrelement 49 für einen doppelwandigen Edelstahlkamin mit einem seitlichen Abzweig 50 zum Anschluss der in Figur 2b in Teilschnittdarstellung gezeigten Nebenluftvorrichtung 10 nach der Erfindung. Bei den in Figur 2a und Figur 2b gezeigten Komponenten 49 und 10 handelt es sich um Komponenten eines Stecksystems, wobei die Nebenluftvorrichtung 10 mit dem Muffenabschnitt 52 auf den Steckabschnitt 54 des Abzweigs 50 aufgesteckt werden kann, um die beiden Komponenten 10, 49 miteinander zu verbinden. FIG. 2a shows in a partial sectional view of a double-walled tubular element 49 for a double-walled stainless steel chimney with a lateral branch 50 for connecting the in FIG. 2b shown in partial section secondary air device 10 according to the invention. At the in Figure 2a and 2b shown components 49 and 10 are components of a plug-in system, wherein the secondary air device 10 can be plugged with the sleeve portion 52 on the plug portion 54 of the branch 50 to connect the two components 10, 49 together.

Mit 56 ist in den Figuren 2a und 2b ein Dämmstoff-Isoliermaterial zwischen einem Außenwandbereich und einem Innenwandbereich der betreffenden Komponente 49 bzw. 10 bezeichnet.With 56 is in the FIGS. 2a and 2b an insulation insulating material between an outer wall portion and an inner wall portion of the respective component 49 or 10 referred to.

Zum Aufbau eines Kamins 2 sind an die Komponente 49 weitere Rohrelemente des betreffenden modularen Kaminbausystems (Stecksystems) anzuschließen.To build a chimney 2 are on the component 49 further tubular elements to connect the relevant modular fireplace system (plug-in system).

Die Nebenluftvorrichtung 10 gemäß Figur 2b ist eine bereits anschlussfertige Baueinheit. Sie umfasst den Nebenlufteinlassstutzen 12, der an seiner außenseitigen Stirnseite 14 mit der Wand 16 verschlossen ist und eine orthogonal zu seiner Achse 24 verlaufende Zwischenwand 58 aufweist, in der die Nebenlufteinlassöffnung 22 als zentraler Ausschnitt vorgesehen ist. Am oberen Rand der Nebenlufteinlassöffnung 22 befindet sich das Gelenk 21 der Regelklappe 18 mit der Schwenkachse 20. Das Einstellgewicht 32 ist eine Schraubmutter, die auf der Gewindestange 60 sitzt und näher an die Schwenkachse 20 herangeschraubt bzw. durch Zurückschrauben davon entfernt werden kann, um das Ansprechverhalten der Regelklappe 18 einzustellen. Die Klappe 18 geht in die Öffnungsstellung über, indem sie gemäß Darstellung in Figur 2b aus der im Wesentlichen vertikalen Verschlussstellung heraus im Uhrzeigersinn nach innen in Richtung Muffenabschnitt 52 schwenkt.The secondary air device 10 according to FIG. 2b is an already ready to connect unit. It comprises the secondary air inlet 12, which is closed at its outer end face 14 with the wall 16 and an orthogonal to its axis 24 extending intermediate wall 58, in which the secondary air inlet opening 22 is provided as a central cutout. At the upper edge of the secondary air inlet opening 22 is the joint 21 of the control flap 18 with the pivot axis 20. The adjustment weight 32 is a screw nut which sits on the threaded rod 60 and can be screwed closer to the pivot axis 20 or removed by screwing it off to the Set response of the damper 18. The flap 18 goes into the open position by, as shown in FIG FIG. 2b from the substantially vertical closure position in the clockwise direction inwardly toward sleeve portion 52 pivots.

Außen an die Nebenlufteinlassöffnung 22 grenzt der Nebenlufteinlasskammerbereich 34 an. Er ist im Beispielsfall der Figur 2b von einem kreiszylindrischen Abschnitt des Nebenlufteinlassstutzens 12 gebildet und weist in der orthogonal zur Achse 24 verlaufenden Querschnittsebene 35 an seinem Umfang verteilte Langlöcher 36 als Kommunikationsöffnungen zu dem Venturiströmungskanal 42 auf.Outside the secondary air inlet opening 22 adjoins the secondary air inlet chamber region 34. He is in the example of the FIG. 2b formed by a circular cylindrical portion of the auxiliary air inlet nozzle 12 and has in the orthogonal to the axis 24 extending cross-sectional plane 35 distributed on its circumference slots 36 as communication openings to the Venturiströmungskanal 42.

Wie auch schon unter Bezugnahme auf Figur 1 erläutert, ist der Venturiströmungskanal 42 ein von dem Außenumfang des Nebenlufteinlassstutzens 12 und dem Innenumfang eines reifförmigen Blechrings 38 begrenzter Ringkanal 42, der sich in Richtung der Achse 24 erstreckt und an seinen axialen Enden die aufgeweiteten Bereiche 40 aufweist. Gut erkennbar in Figur 2b ist die Engstelle 44 des Venturiströmungskanals 42 zwischen den beiden aufgeweiteten Bereichen 40. Diese Engstelle 44 steht über die Kommunikationsöffnungen 36 mit dem Nebenlufteinlasskammerbereich 34 in Verbindung. In axialer Richtung sind die Kommunikationsöffnungen 36 schmaler als der Blechring 38, so dass letzterer die Kommunikationsöffnungen 36 radial außen mit radialem Abstand überdeckt.As with reference to FIG. 1 1, the venturi flow passage 42 is an annular passage 42 defined by the outer circumference of the sub-air intake port 12 and the inner circumference of a reef-shaped sheet ring 38, extending in the direction of the axis 24 and having the flared portions 40 at its axial ends. Well recognizable in FIG. 2b is the constriction 44 of Venturiströmungskanals 42 between the two flared portions 40. This constriction 44 communicates via the communication openings 36 with the secondary air inlet chamber portion 34 in connection. In the axial direction, the communication openings 36 are narrower than the sheet metal ring 38, so that the latter covers the communication openings 36 radially outward with a radial distance.

Radial außen sind der Nebenlufteinlassstutzen 12 über die Länge seines Nebenlufteinlasskammerbereichs 34 und der Blechring 38 von einem mit zahlreichen Löchern 62 perforierten Schutzblechring 64 umgeben, welcher den Blechring 38 in der korrekten axialen Position hält, so dass die Engstelle 44 in der Ebene 35 der Kommunikationsöffnungen 36 positioniert ist.Radially outwardly, the sub-air inlet port 12 is surrounded by a plurality of holes 62 perforated fender ring 64 over the length of its Nebenlufteinkammerkammerbereich 34 and the metal ring 38, which holds the sheet-metal ring 38 in the correct axial position, so that the bottleneck 44 in the plane 35 of the communication openings 36th is positioned.

Im Bereich der Stirnseite 14 ist der Venturiströmungskanal 42 für ein Einlass von Windströmung an seinem Kanaleingang 40 offen. Die an dem Kanalausgang 48 aus dem Venturiströmungskanal 42 ausströmende Luft kann durch die Löcher 62 des Schutzblechrings 64 nach außen abströmen.In the region of the end face 14, the venturi flow channel 42 is open for an inlet of wind flow at its channel inlet 40. The effluent at the channel exit 48 from the Venturiströmungskanal 42 air can flow through the holes 62 of the fender ring 64 to the outside.

Claims (10)

  1. Secondary air device (10) for an exhaust gas line (2) of a furnace, comprising a secondary air intake nozzle (12) which can be connected to the exhaust gas line (2) and has a secondary air intake (22) and a flap (18) assigned to the secondary air intake (22) as a variable closure element, the flap (18) having flap sides (28, 30), which face in the opposite direction to one another, and being designed to adjust the opening width of the secondary air intake (22) according to the difference between the pressures on the flap sides (28, 30), which face in opposite directions, the secondary air intake nozzle (12) comprising a secondary air intake chamber region (34) at the outer end thereof, which region is adjacent to the outside of the secondary air intake (22) and is in communication with the external environment of the secondary air device (10) in order to take in secondary air, and the secondary air intake chamber region (34) being joined to the outer end face (14) of the secondary air intake nozzle, characterised in that the secondary air device (10) comprises a Venturi flow passage (42) which is located outside the secondary air intake chamber region (34) and has a passage inlet (46) which is open to the external environment of the secondary air device (10), a passage outlet (48) and a narrow point (44) between the passage inlet (46) and the passage outlet (48), the Venturi flow passage (42) being connected at the narrow point (44) thereof to the secondary air intake chamber region (34) via at least one communication opening (36).
  2. Secondary air device (10) according to claim 1, characterised in that the Venturi flow passage (42) is an annular passage which is widened at the axial ends thereof and has an annular passage cross section which is provided around the circumference of the secondary air intake nozzle (12), the passage inlet (46) and the passage outlet (48) being located at the opposing axial ends of the annular passage (42).
  3. Secondary air device (10) according to claim 2, characterised in that the Venturi flow passage (42) is radially defined on the inside by the outer circumference of the secondary air intake nozzle (12) and is radially delimited on the outside by a hoop-shaped sheet-metal ring (38) which is arranged coaxially with the secondary air intake nozzle (12).
  4. Secondary air device (10) according to claim 3, characterised in that the sheet-metal ring (38) comprises in particular conical widenings (40) on both sides at the axial ends thereof.
  5. Secondary air device (10) according to any of the preceding claims, characterised in that the secondary air intake nozzle (12) comprises a plurality of communication openings (36) distributed over the circumference thereof, which openings are located in the same cross-sectional plane (35) as the narrow point (44) of the Venturi flow passage (42).
  6. Secondary air device (10) according to any of the preceding claims, characterised in that the secondary air intake chamber region (34) is in communication with the external environment by means of the at least one communication opening (36) in order to introduce secondary air from the external environment into the secondary air intake chamber region (34).
  7. Secondary air device (10) according to any of the preceding claims, characterised in that the secondary air intake nozzle (12) and the Venturi flow passage (42) are surrounded by a perforated protective sheet-metal ring (64).
  8. Secondary air device (10) according to any of the preceding claims, characterised in that it is prefabricated to form a constructional unit (10) which can be connected to the exhaust gas line (2).
  9. Exhaust gas line (2) comprising a secondary air device (10) according to any of the preceding claims.
  10. Exhaust gas line (2) according to claim 9, characterised in that it comprises at least one portion extending for an external region of a building, and the secondary air device (10) is arranged on the outside of said portion.
EP20120196462 2011-12-12 2012-12-11 Auxiliary ventilation device for an exhaust gas line of a fireplace and an exhaust gas line provided with such an auxiliary ventilation device, in particular an external exhaust gas line Not-in-force EP2604921B1 (en)

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DE102011088297A DE102011088297A1 (en) 2011-12-12 2011-12-12 Secondary air device for an exhaust pipe of a fireplace and equipped with such a secondary air device exhaust pipe, in particular exhaust gas outer line

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EP2604921A1 EP2604921A1 (en) 2013-06-19
EP2604921B1 true EP2604921B1 (en) 2015-03-04

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Publication number Priority date Publication date Assignee Title
DE202015001000U1 (en) 2015-02-09 2016-05-10 Kutzner + Weber Gmbh Secondary air device for an exhaust pipe of a fireplace and equipped with such a secondary air device exhaust pipe, in particular exhaust gas outer line

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2033398A (en) * 1933-01-28 1936-03-10 Clarence B Rogers Check draft damper
US2263980A (en) * 1938-06-16 1941-11-25 Gen Motors Corp Air control mechanism
DE852271C (en) * 1950-11-07 1952-10-13 Willy Tietze Automatic auxiliary draft regulator for all types of combustion systems
IT1184298B (en) * 1985-07-24 1987-10-22 Gianfranco Pronti SMOKE EXHALER
DE4039676C1 (en) 1990-10-22 1992-01-30 Kutzner + Weber Gmbh, 8031 Maisach, De Draught control flap for flue - incorporates counterbalance weight and brake to prevent sudden movements
DE19529010A1 (en) 1995-07-25 1997-01-30 Gerhard Kutter Secondary air set for house chimneys - comprises a measuring aperture on component(s) of secondary air set etc.
US20020100471A1 (en) * 2001-01-12 2002-08-01 York International Corporation Device for drawing dilution air
DE20308110U1 (en) 2003-05-23 2004-10-07 Kutzner + Weber Gmbh Draw regulator with cover

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EP2604921A1 (en) 2013-06-19

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