EP2664849B1 - Dispositif de mélange air-gaz combustible - Google Patents

Dispositif de mélange air-gaz combustible Download PDF

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Publication number
EP2664849B1
EP2664849B1 EP13166357.7A EP13166357A EP2664849B1 EP 2664849 B1 EP2664849 B1 EP 2664849B1 EP 13166357 A EP13166357 A EP 13166357A EP 2664849 B1 EP2664849 B1 EP 2664849B1
Authority
EP
European Patent Office
Prior art keywords
flap
air
mixing device
lock
gas supply
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.)
Active
Application number
EP13166357.7A
Other languages
German (de)
English (en)
Other versions
EP2664849A3 (fr
EP2664849A2 (fr
Inventor
Jochen Wriske
Matthias Wodtke
Nicole Schmidt
Gabriele Lange
Thomas Messerschmidt
Bernhard Zscheile
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vaillant GmbH
Original Assignee
Vaillant GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vaillant GmbH filed Critical Vaillant GmbH
Publication of EP2664849A2 publication Critical patent/EP2664849A2/fr
Publication of EP2664849A3 publication Critical patent/EP2664849A3/fr
Application granted granted Critical
Publication of EP2664849B1 publication Critical patent/EP2664849B1/fr
Active legal-status Critical Current
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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
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/02—Regulating draught by direct pressure operation of single valves or dampers

Definitions

  • the invention relates to a fuel gas-air mixing device for a heater.
  • Generic mixing devices are based on a mixing nozzle, usually a venturi nozzle, in which air is conveyed through the nozzle by means of a blower.
  • a mixing nozzle usually a venturi nozzle
  • fuel gas is supplied orthogonally.
  • a throttle in the gas path the amount of fuel gas required for clean combustion is adjusted in relation to the amount of air.
  • the venturi ensures that over a certain range of air mass flow, the fuel gas to air ratio remains constant within close tolerances.
  • the patent application DE 196 35 974 A1 describes a fuel gas-air mixing device for gas heaters, in which the opening cross section is adapted to the combustion chamber by a gravity-loaded pendulum flap depending on the volume flow.
  • the patent EP 1 183 483 B1 describes a mixing device for fuel gas and combustion air with two parallel air nozzles in the form of Venturi nozzles.
  • One or alternatively both air nozzles can be switched off by means of shut-off devices.
  • the shut-off devices are designed as flaps, wherein the flaps are held by springs against the flow direction. The spring rate thus determines the Absperr characterizing.
  • the godparent application EP 1 445 451 A2 discloses a flap for a second channel in an exhaust system of motor vehicles.
  • closure means which comprises the flap
  • the closure means is formed so that no enrichment of the fuel gas-air mixture takes place in the transition region.
  • the flap openings This allows the air in the partially closed state of the flap to flow through the openings. This prevents high flow velocities occurring in the region of the second gas supply.
  • the closure means comprises a locking means which is locked at low air mass flows and in the transition region to high air mass flows.
  • the locking means may be a drive such as a stepper motor.
  • the locking means may be an electromagnet. This makes it possible to control the locking means directly by means of a controller.
  • the locking means is a latch which locks the flap passively. This is done by means of an aerodynamically acting body. This body is provided in the air flow of the first air channel. The aerodynamic effect can be caused by buoyancy or air resistance.
  • the aerodynamically acting body is designed so that the latch opens the flap only when the air mass flow is sufficiently large to open the door.
  • the effect that high flow rates occur in the region of the second gas supply is also achieved in that the second air duct in the flap and the flap itself are shaped so that at low opening angles of the flap, the gap between the flap and the second air channel in Area outside the second gas supply opens faster than in the area of the second gas supply. This also prevents high flow velocities occurring in the region of the second gas supply.
  • the locking means is actuated depending on the rotational speed of a fan included in the mixing device.
  • the actuation takes place in the form of a hysteresis.
  • FIGS. 1 to 3 show a sectional drawing of an embodiment of the mixing device according to the invention.
  • the mixing nozzle 1 which is designed as a Venturi nozzle.
  • the mixing nozzle 1 is divided into a first air channel 2 and a second air channel 3.
  • the second air channel 3 can be locked by a closure means 6 in the form of a flap 9.
  • the flap 9 is designed so that at the same time the second Gas supply 5 is lockable. At high air mass flows, the flap 9 is opened by the back pressure. At the same time, the second gas supply 5 is opened.
  • the flap 9 is connected via a shaft 7 with a drive 8. As a result, the flap 9 can be actively opened, so that an unwanted partial opening of the flap 9 is prevented.
  • an electromagnet 10 is shown, which cooperates with the flap 9.
  • This solenoid can be controlled so that the flap 9 is locked at low air mass flows and in the transition region. Only at sufficiently high air mass flows of the electromagnet 10, the flap 9 free, so this then opens reliably.
  • FIG. 3 shows a latch 11 which locks the flap 9 in a closed position.
  • the bolt 11 is connected to a biased by a spring latch actuator 12, which is arranged in the air flow of the first air duct 2.
  • High air mass flows cause that in this example formed as a support surface locking actuator 12 is actuated so that the latch 11, the flap 9 releases.
  • Latch 12 and flap 9 are coordinated so that the flap 9 opens reliably at this air mass flow.
  • FIG. 4 shows a sectional drawing of another embodiment of the mixing device according to the invention.
  • the flap 9 has a plurality of openings 13 through which air can flow.
  • a gap 14 is formed between the flap 9 and the second air channel 3.
  • the contours of the second air channel 3 and the outer edge of the flap 9 are designed so that at low opening angles of the flap 9, the gap opens faster outside the range of the second gas supply 5 than in the region of the second gas supply 5. This can be achieved, for example, that the second air duct in this area has no rotationally symmetrical cross section. Rather, the cross-section widens outside the range of the second gas supply 5 more than in the region of the second gas supply. 5
  • FIG. 5 represents a measured course of the fuel gas-air ratio over the entire power range of a heater.
  • a value of the fuel gas-air ratio greater than 1 corresponds to an excess of air, a value less than 1 corresponds to lack of air.
  • a value of 1.3 is considered optimal.
  • the measurement curve 15 was recorded with a mixing device according to the prior art. In the power range of the heater between 7 and 15 kW is a drop in the value of the fuel gas-air ratio recorded, which corresponds to an enrichment of the mixture and thus leads to higher pollutant emissions.
  • the measurement curve 16 was used with a mixing device according to the invention according to FIG. 4 added.
  • the enrichment of the mixture can be significantly reduced here.

Landscapes

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

Claims (12)

  1. Dispositif de mélange (1) pour un appareil de chauffage pour mélanger du gaz combustible et de l'air dans un rapport de mélange défini, comprenant une buse de mélange (1), de préférence une buse Venturi, laquelle inclut un premier canal d'air (2) avec une première amenée de gaz (4) et un deuxième canal d'air (3) avec une deuxième amenée de gaz (5), par laquelle de l'air peut être guidé, de l'air peut être transporté au moyen d'une soufflante avec vitesse de rotation variable par la buse de mélange (1), et comprenant un moyen de fermeture (6), lequel comprend au moins un clapet (9), dans lequel le moyen de fermeture (6) est réalisé de telle sorte qu'en fonctionnement, pour des flux massiques d'air faibles, le clapet (9) ferme dans une position de fermeture le deuxième canal d'air (3) et/ou la deuxième amenée de gaz (5), dans lequel le moyen de fermeture (6) est réalisé de sorte que la vitesse de l'air dans le deuxième canal d'air dans la zone de la deuxième amenée de gaz dans la zone de transition entre des flux massiques d'air faibles et des flux massiques d'air élevés soit aussi faible qu'aucun enrichissement du mélange gaz combustible-air n'a lieu,
    caractérisé en ce
    que le clapet (9) présente des ouvertures (13), par lesquelles de l'air peut s'écouler dans la position de fermeture du clapet (9) ou à proximité de la position de fermeture du clapet (9), de sorte que la vitesse d'écoulement dans la zone de la deuxième amenée de gaz (5) soit réduite.
  2. Dispositif de mélange selon la revendication 1, dans lequel le moyen de fermeture (6) comprend en outre un moyen de verrouillage (8, 10, 11) et dans lequel le moyen de verrouillage (8, 10, 11) est réalisé de sorte que le clapet (9), pour des flux massiques d'air faibles, en particulier dans la zone de transition vers des flux massiques d'air élevés, soit maintenu dans la position de fermeture, de sorte qu'une ouverture partielle du clapet soit empêchée.
  3. Dispositif de mélange selon la revendication 2, dans lequel le moyen de verrouillage est un entraînement (8), en particulier un moteur pas à pas, qui est relié au clapet (9) par le biais d'un arbre (7).
  4. Dispositif de mélange selon la revendication 2, dans lequel le moyen de verrouillage est un aimant (10), en particulier un électroaimant.
  5. Dispositif de mélange selon la revendication 2, dans lequel le moyen de verrouillage est un verrou (11), lequel coopère avec un actionnement par loquet (12) de sorte que le loquet (11) verrouille le clapet en cas de flux massiques d'air faibles.
  6. Dispositif de mélange selon la revendication 5, dans lequel l'actionnement par loquet (12) est un corps à action aérodynamique agencé dans le premier canal d'air (2).
  7. Dispositif de mélange selon la revendication 6, dans lequel l'actionnement par loquet (12) est réalisé de sorte qu'il subisse une poussée dans le flux d'air et déverrouille ainsi le loquet (11).
  8. Dispositif de mélange selon la revendication 6, dans lequel l'actionnement par loquet (12) est réalisé de sorte qu'il subisse une force dans le flux d'air en raison de la résistance de l'air et déverrouille ainsi le loquet (11).
  9. Dispositif de mélange selon l'une quelconque des revendications 5 à 8, dans lequel l'actionnement par loquet (12) et le clapet (9) coopèrent de sorte qu'en fonctionnement l'actionnement par loquet (12) n'ouvre le loquet (11) que lorsque le flux massique d'air est suffisamment important pour ouvrir fiablement le clapet (9).
  10. Procédé de fonctionnement d'un dispositif mélange selon l'une quelconque des revendications 3 à 4, caractérisé en ce que l'entraînement (8) ou l'aimant (10) sont commandés de telle sorte que le clapet (9) est verrouillé en dessous d'une première vitesse de rotation et est déverrouillé au-dessus d'une deuxième vitesse de rotation.
  11. Procédé selon la revendication 10, dans lequel la première et la deuxième vitesse de rotation sont identiques.
  12. Procédé selon la revendication 10, dans lequel la première vitesse de rotation est inférieure à la deuxième vitesse de rotation.
EP13166357.7A 2012-05-15 2013-05-03 Dispositif de mélange air-gaz combustible Active EP2664849B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012009628A DE102012009628A1 (de) 2012-05-15 2012-05-15 Brenngas-Luft-Mischvorrichtung

Publications (3)

Publication Number Publication Date
EP2664849A2 EP2664849A2 (fr) 2013-11-20
EP2664849A3 EP2664849A3 (fr) 2017-03-15
EP2664849B1 true EP2664849B1 (fr) 2018-11-21

Family

ID=48288858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13166357.7A Active EP2664849B1 (fr) 2012-05-15 2013-05-03 Dispositif de mélange air-gaz combustible

Country Status (4)

Country Link
EP (1) EP2664849B1 (fr)
DE (1) DE102012009628A1 (fr)
ES (1) ES2711877T3 (fr)
TR (1) TR201902325T4 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014204786A1 (de) * 2014-03-14 2015-09-17 Robert Bosch Gmbh Steuergerät, Brenner sowie Verfahren zum Betrieb solch eines Steuergeräts
US9746176B2 (en) * 2014-06-04 2017-08-29 Lochinvar, Llc Modulating burner with venturi damper
EP3152489B1 (fr) 2014-06-09 2018-11-07 Dayco IP Holdings, LLC Dispositifs venturi dotés de doubles trajets d'écoulement venturi
WO2019026665A1 (fr) * 2017-08-03 2019-02-07 タイム技研株式会社 Mélangeur de fluide
JP7079968B2 (ja) * 2018-05-09 2022-06-03 株式会社パロマ 予混合装置及び燃焼装置
EP4056897A1 (fr) 2021-03-10 2022-09-14 BDR Thermea Group B.V. Dispositif de mélange pour un chauffage au gaz

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US2678877A (en) * 1951-08-24 1954-05-18 Tallent H Ransome Apparatus for producing combustible gaseous mixtures of substantially constant pressure
DE2457567B1 (de) * 1974-12-05 1975-11-20 Wamsler Herd & Ofen Gmbh Verfahren und Vorrichtung zum Vermindern der Waermeverluste von kamingebundenen Gas-Raumheizgeraeten waehrend des Betriebs
DE2631718A1 (de) * 1975-07-28 1977-02-10 Leblanc Sa E L M Gasbeheizter warmwasserbereiter mit gasdichtem abzug
DE2656580C3 (de) * 1976-12-11 1979-10-04 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Steuereinrichtung für eine Abgassperre
US4465456A (en) * 1981-08-24 1984-08-14 Foster-Miller Inc. Variable firing rate burner
AT400075B (de) * 1991-08-06 1995-09-25 Vaillant Gmbh Verfahren zum einstellen eines mit einem brenner versehenen gasheizgerätes durch vorgabe eines gasdurchsatzes und einrichtung zum einstellen dieses gasdurchsatzes
DE19635974A1 (de) 1996-09-05 1998-03-12 Stiebel Eltron Gmbh & Co Kg Gas/Luft-Mischsystem für Gasheizgeräte
DE19756301B4 (de) * 1996-12-16 2010-03-04 Vaillant Gmbh Einrichtung zur Aufbereitung eines Gas-Luftgemisches
DE19925567C1 (de) * 1999-06-04 2000-12-14 Honeywell Bv Vorrichtung für Gasbrenner
DE10304364A1 (de) * 2003-02-04 2004-08-12 J. Eberspächer GmbH & Co. KG Drosselanordnung sowie Abgasanlage mit einer derartigen Drosselanordnung
DE102009058453B4 (de) * 2009-12-16 2011-09-01 Robert Bosch Gmbh Gasgebläsebrenner mit modulierbarer Brennerleistung und Verfahren zum Betreiben eines Gasgebläsebrenners
ITBO20100441A1 (it) 2010-07-12 2012-01-13 Gas Point S R L Bruciatore a gas a pre-miscelazione

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Also Published As

Publication number Publication date
TR201902325T4 (tr) 2019-03-21
ES2711877T3 (es) 2019-05-08
DE102012009628A1 (de) 2013-11-21
EP2664849A3 (fr) 2017-03-15
EP2664849A2 (fr) 2013-11-20

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