EP2623863B1 - Dispositif de mélange air-gaz combustible - Google Patents

Dispositif de mélange air-gaz combustible Download PDF

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Publication number
EP2623863B1
EP2623863B1 EP20130153084 EP13153084A EP2623863B1 EP 2623863 B1 EP2623863 B1 EP 2623863B1 EP 20130153084 EP20130153084 EP 20130153084 EP 13153084 A EP13153084 A EP 13153084A EP 2623863 B1 EP2623863 B1 EP 2623863B1
Authority
EP
European Patent Office
Prior art keywords
air
throttle portion
air duct
mixing device
cross
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
EP20130153084
Other languages
German (de)
English (en)
Other versions
EP2623863A2 (fr
EP2623863A3 (fr
Inventor
Jochen Wriske
Matthias Wodtke
Nicole Schmidt
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 EP2623863A2 publication Critical patent/EP2623863A2/fr
Publication of EP2623863A3 publication Critical patent/EP2623863A3/fr
Application granted granted Critical
Publication of EP2623863B1 publication Critical patent/EP2623863B1/fr
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Anticipated expiration legal-status Critical

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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
    • 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
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/007—Mixing tubes, air supply regulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14481—Burner nozzles incorporating flow adjusting means

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 patent DE 41 37 573 C1 discloses a mixing device with a streamlined displacement body within a venturi.
  • the position of the displacement body within the Venturi nozzle in the air flow direction by means of spindle is adjustable.
  • the gas supply can be throttled.
  • the patent DE 103 24 706 B3 describes a mixing device in which a cone-shaped displacement body by a stell engine in an air nozzle is retracted.
  • the cone servo motor operates in response to a sensor signal that detects changes in gas quality, air pressure, and / or combustion air temperature.
  • the mixing devices known from the prior art have the disadvantage that the relationship determined by the geometry between air volume and pressure loss in the narrow cross-section are changed only by leaps and bounds, but not continuously can. Even in the case of a steady opening of the shut-off device in one of the air nozzles, the pressure signal which is decisive for the gas injection remains exclusively dependent on the existing, unchangeable nozzle geometry. Furthermore, the introduction of gravity or spring-loaded shut-off devices in the flow path causes control tolerances, which is due on the one hand to unfavorable flow conditions and on the other hand to the sensitivity of the pressure loss to component tolerances.
  • the aim is to generate a sufficiently large pressure signal with a venturi pneumatic air / gas composite in partial load operation in order to ensure accurate control of the gas fitting.
  • the flow path of the air supply is designed so that it is designed without interference and without edges or sheets, where turbulence.
  • a continuous change of the cross section depending on the air mass flow is provided.
  • the direction of the displacement is parallel to the direction of air flow, so that this shift can be effected simply by air pressure differences before and after the mixing device.
  • the mixing device is designed so that the flowing air and thus the acting air pressure of the composite shifts the air duct and / or the throttle means against an elastic element in the air flow direction.
  • the elastic element defines a force-distance relationship.
  • the design of the air channel, the throttle means and the elastic element are adapted so that increases continuously with increasing air mass flow, the cross-sectional area formed between the throttle means and the air duct. This ensures that in a wide range for the air mass flow, the minimum flow velocity required for the reliable functioning of the mixing device is present and thus there is a sufficiently high negative pressure for a function of the mixing device.
  • the displaceable throttle means or the displaceable air duct is coupled with a separate fuel gas valve so that it is opened simultaneously with the air duct opening displacement of the throttle means or air duct continuously and in proportion to the change in cross section of the air duct. This ensures that at each operating point of the mixing device, the air / fuel gas ratio corresponds to a predetermined value.
  • the aerodynamic design is ensured by an advantageous length / diameter ratio.
  • the term diameter should not be limited to circular cross-sections, but rather be applicable to any cross-sectional shape.
  • the throttle means on continuous cross-sectional transitions. For an undisturbed flow along the throttle means is possible.
  • the elastic element is a spring.
  • the air channel is stationary and the throttle means slidably executed.
  • the throttle means is connected to a spring-loaded lever which is so long that the throttle means along an approximately linear locus is movable parallel to the air flow direction.
  • the throttle means is stationary and the air duct slidably executed.
  • the air duct is displaceably guided linearly against a spring.
  • FIG. 1 shows a name of a mixing device according to the invention.
  • blower air is conveyed through the venturi.
  • the Venturi nozzle is formed from the air duct 2 and the throttle means 3 contained therein. Seen from the left, the free cross-section for the air flow decreases continuously to a cross-sectional constriction 4, after which it widens again.
  • a feed 5 is provided for fuel gas.
  • the higher flow velocity within the cross-sectional constriction forms a negative pressure, so that through the feed 5 fuel gas is conveyed into the airway and mixed with the air.
  • the speed of the blower not shown here, the amount of the gas-air mixture can be changed.
  • the mixing ratio between fuel gas and air remains constant in a certain range. If the speed of the fan and thus the mass flow of the air is reduced even further, it is no longer possible to ensure that the mixing ratio remains constant. For this reason, the Venturi nozzle 1 is designed so that the air channel 2 and the throttle means 3 can shift due to the pressure conditions that are set by the air flow, the way that at high flow velocities, the free cross-sectional area between the air duct 2 and throttle means. 3 increased or reduced with low flow rates.
  • the feed 5 is connected to a valve 6, with which the mass flow of the supplied fuel gas is variable.
  • the valve 6 is connected to the air passage 2 so that the valve 6 is opened when the air passage 2 is shifted to the right.
  • the throttle means 3 has the shape of an ellipsoid of revolution.
  • the throttle means 3 is on a long Lever mounted so that it is guided along a circular path with a very large radius, which is approximately a straight line. With increasing air velocity, the throttle means is pressed against the spring 7 to the right.
  • the lever is connected to a valve 6, through which the fuel gas supply can be metered by the feed 5. With increasing air speed, the valve 6 is opened more and more, so that the fuel gas supply is adjusted to the amount of air.

Landscapes

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

Claims (9)

  1. Dispositif de mélange destiné à mélanger du gaz combustible et de l'air dans une proportion de mélange défini, comprenant une buse mélangeuse (1), laquelle contient un conduit d'air (2) par lequel l'air peut passer, comprenant une arrivée (5) pour le gaz combustible, laquelle entre dans la buse mélangeuse (1), et comprenant un moyen d'étranglement (3), le moyen d'étranglement (3) facilitant l'écoulement et étant disposé dans le conduit d'air (2) de sorte que la section transversale restante entre le conduit d'air (2) et le moyen d'étranglement (3) forme en général un rétrécissement de section (4) continu dans lequel l'arrivée (5) entre, et de sorte que le moyen d'étranglement (3) et le conduit d'air (2) peuvent être déplacés relativement l'un par rapport à l'autre dans le sens de l'écoulement, de sorte que la surface de section s'élargit en continu et de façon réversible dans la région du rétrécissement de section (4) avec un débit massique d'air croissant, le moyen d'étranglement (3) pouvant être déplacé ou le conduit d'air (2) pouvant être déplacé est couplé avec une vanne (6) pour le gaz combustible, de sorte que celle-ci est ouverte en continu lorsque le moyen d'étranglement (3) pouvant être déplacé ou le conduit d'air (2) pouvant être déplacé bouge dans un sens qui entraîne l'agrandissement de la surface de section dans la région du rétrécissement de section (4), caractérisé en ce que le conduit d'air (2) et le moyen d'étranglement (3) sont conçus de sorte que l'air qui passe exerce une force sur le conduit d'air (2) et/ou sur le moyen d'étranglement (3) et en ce que cette force agit contre un élément élastique (7), de sorte que le moyen d'étranglement (3) et le conduit d'air (2) se déplacent l'un par rapport à l'autre dans le sens de l'écoulement.
  2. Dispositif de mélange selon la revendication 1, dans lequel le moyen d'étranglement (3) présente un ratio longueur/diamètre supérieur à 0,5, de préférence supérieur à 1 dans le sens de l'écoulement.
  3. Dispositif de mélange selon la revendication 1 ou 2, dans lequel le moyen d'étranglement (3) présente en général des passages de section en continu dans le sens de l'écoulement.
  4. Dispositif de mélange selon l'une quelconque des revendications 1 à 3, dans lequel le moyen d'étranglement présente en général une forme elliptique dans le sens de l'écoulement.
  5. Dispositif de mélange selon l'une quelconque des revendications 1 à 4, dans lequel l'élément élastique (7) est un ressort.
  6. Dispositif de mélange selon l'une quelconque des revendications 1 à 5, dans lequel le conduit d'air (2) et le moyen d'étranglement (3) peuvent coulisser.
  7. Dispositif de mélange selon la revendication 6, dans lequel le moyen d'étranglement (3) est relié à un levier actionné par ressort.
  8. Dispositif de mélange selon l'une quelconque des revendications 1 à 5, dans lequel le moyen d'étranglement (3) est fixe et le conduit d'air (2) peut coulisser.
  9. Dispositif de mélange selon la revendication 8, dans lequel le conduit d'air (2) peut être déplacé linéairement contre un ressort.
EP20130153084 2012-01-31 2013-01-29 Dispositif de mélange air-gaz combustible Active EP2623863B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012001724 2012-01-31
DE201210003501 DE102012003501A1 (de) 2012-01-31 2012-02-22 Brenngas-Luft-Mischvorrichtung

Publications (3)

Publication Number Publication Date
EP2623863A2 EP2623863A2 (fr) 2013-08-07
EP2623863A3 EP2623863A3 (fr) 2013-08-21
EP2623863B1 true EP2623863B1 (fr) 2014-11-19

Family

ID=47709875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20130153084 Active EP2623863B1 (fr) 2012-01-31 2013-01-29 Dispositif de mélange air-gaz combustible

Country Status (4)

Country Link
EP (1) EP2623863B1 (fr)
DE (1) DE102012003501A1 (fr)
DK (1) DK2623863T3 (fr)
ES (1) ES2528968T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6738493B2 (ja) * 2017-08-03 2020-08-12 タイム技研株式会社 流体混合装置
DE102017216961A1 (de) * 2017-09-25 2019-03-28 Robert Bosch Gmbh Mischeinrichtung für Heizgeräte sowie Heizgeräte mit einer solchen Mischeinrichtung
CN113776071B (zh) * 2021-09-30 2022-06-07 合肥工业大学 一种voc低温燃烧的尾气进气气压自控装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8800711U1 (fr) * 1988-01-22 1988-04-14 Motoren-Werke Mannheim Ag, 6800 Mannheim, De
DE4137573C2 (de) * 1991-11-15 1998-01-15 Motoren Werke Mannheim Ag Venturi-Mischer zum Mischen von Gas und Luft, insbesondere für einen Verbrennungsmotor
DE19635974A1 (de) 1996-09-05 1998-03-12 Stiebel Eltron Gmbh & Co Kg Gas/Luft-Mischsystem für Gasheizgeräte
DE19729047C1 (de) * 1997-07-08 1998-09-24 Honeywell Bv Mischvorrichtung zur Erzeugung eines Gemisches aus Gas und Verbrennungsluft für einen Brenner
DE19806315C2 (de) * 1998-02-06 2000-05-25 Horst Gatzke Treib- und Mischdüse
DE19925567C1 (de) 1999-06-04 2000-12-14 Honeywell Bv Vorrichtung für Gasbrenner
DE10119598C2 (de) * 2001-04-21 2003-10-02 Bosch Gmbh Robert Vorrichtung zum Mischen von Gas und Luft für ein Gasheizgerät
DE10324706B3 (de) * 2003-05-30 2004-12-02 Hovalwerk Ag Vorrichtung zum Regeln des Gas/Luft-Verhältnisses für eine vormischende Verbrennungseinrichtung
ITBO20080278A1 (it) * 2008-04-30 2009-11-01 Gas Point S R L Bruciatore a gas a pre-miscelazione
ITBO20100441A1 (it) 2010-07-12 2012-01-13 Gas Point S R L Bruciatore a gas a pre-miscelazione

Also Published As

Publication number Publication date
EP2623863A2 (fr) 2013-08-07
ES2528968T3 (es) 2015-02-13
DK2623863T3 (da) 2015-03-02
EP2623863A3 (fr) 2013-08-21
DE102012003501A1 (de) 2013-08-01

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