EP2686609B1 - Dispositif de mélange pour mélanger de l'air de combustion et du gaz pour un appareil à gaz - Google Patents

Dispositif de mélange pour mélanger de l'air de combustion et du gaz pour un appareil à gaz Download PDF

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

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L5/00—Blast-producing apparatus before the fire
    • F23L5/02—Arrangements of fans or blowers

Definitions

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

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

Claims (10)

  1. Dispositif de mélange pour le mélange d'air de combustion et de gaz pour un appareil à gaz, avec
    a. un boîtier (2) avec une amenée de gaz pouvant s'y raccorder,
    b. un insert de buse (4) agencé de manière remplaçable dans le boîtier (2), qui présente une surface de section transversale d'écoulement (Q) prédéterminée,
    c. dans lequel le boîtier (2) présente une zone d'entrée (6), qui forme une section d'entrée (7) s'amincissant dans la direction d'écoulement d'une buse Venturi (3),
    d. dans lequel l'insert de buse (4) forme au moins une section de sortie (13) s'élargissant dans la direction d'écoulement de la buse Venturi (3), dans lequel
    e. un corps de refoulement (5) s'étendant sur une longueur axiale prédéterminée, réduisant la surface de section transversale d'écoulement (Q) est réalisé à l'intérieur de l'insert de buse (4), caractérisé en ce que
    f. le corps de refoulement (5) est maintenu au centre de la surface de section transversale d'écoulement au moyen de nervures verticales (12), et
    g. l'insert de buse (4) est fixé au niveau de sa zone de bord (20) située en aval s'appliquant au moins par section par correspondance de forme de manière étanche sur le boîtier (2).
  2. Dispositif de mélange selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que la zone d'entrée (6) s'étend dans la direction d'écoulement jusqu'à la section transversale la plus faible de la buse Venturi (3).
  3. Dispositif de mélange selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'une transition (10) de la zone d'entrée (6) à l'insert de buse (4) forme la section transversale la plus faible de la buse Venturi (3).
  4. Dispositif de mélange selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le corps de refoulement (5) fait saillie en amont de l'extrémité axiale de l'insert de buse (4) et est réalisé pointu dans la zone en saillie (17).
  5. Dispositif de mélange selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le corps de refoulement (5) est un corps creux, dont l'extrémité axiale située en aval (8) est ouverte.
  6. Dispositif de mélange selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le corps de refoulement (5) s'étend sur 70-90 % de la longueur axiale de l'insert de buse (4),
  7. Dispositif de mélange selon au moins l'une quelconque des revendications précédentes 5 et 6, caractérisé en ce que l'extrémité axiale située en aval (8) du corps de refoulement (5) est espacée d'une extrémité axiale située en aval (14) de l'insert de buse (4).
  8. Dispositif de mélange selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le boîtier (2) est réalisé d'une pièce avec un boîtier de soufflante (9) d'une soufflante.
  9. Dispositif de mélange selon la revendication 3, caractérisé en ce qu'au moins une ouverture d'entrée de gaz (11) est prévue au niveau de la transition (10).
  10. Dispositif de mélange selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le boîtier (2) est en aluminium et l'insert de buse (4) est en plastique.
EP12705644.8A 2011-03-15 2012-02-15 Dispositif de mélange pour mélanger de l'air de combustion et du gaz pour un appareil à gaz Active EP2686609B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011014117A DE102011014117A1 (de) 2011-03-15 2011-03-15 Mischvorrichtung zur Mischung von Verbrennungsluft und Gas für ein Gasgerät
PCT/EP2012/052605 WO2012123207A2 (fr) 2011-03-15 2012-02-15 Dispositif de mélange pour mélanger de l'air de combustion et du gaz pour un appareil à gaz

Publications (2)

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

Family

ID=45756981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12705644.8A Active EP2686609B1 (fr) 2011-03-15 2012-02-15 Dispositif de mélange pour mélanger de l'air de combustion et du gaz pour un appareil à gaz

Country Status (4)

Country Link
EP (1) EP2686609B1 (fr)
DE (1) DE102011014117A1 (fr)
TR (1) TR201906191T4 (fr)
WO (1) WO2012123207A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL3064778T3 (pl) * 2015-03-06 2022-05-23 Elica S.P.A. Wentylator promieniowy z układem mieszania powietrza z gazem
DE102016113588A1 (de) * 2016-07-22 2018-01-25 Ebm-Papst Landshut Gmbh Gas-Luft-Mischvorrichtung
DE102018128255A1 (de) * 2018-11-12 2020-05-14 Ebm-Papst Landshut Gmbh Gebläsevorrichtung
DE102019109369A1 (de) * 2019-04-09 2020-10-15 Ebm-Papst Landshut Gmbh Adaptervorrichtung ausgeführt zur befestigten Anordnung an einer Ansaugöffnung eines Gasgebläses
DE102019112645A1 (de) * 2019-05-14 2020-11-19 Ebm-Papst Landshut Gmbh Einströmvorrichtung für ein Gasgebläse
DE102019115741A1 (de) * 2019-06-11 2020-12-17 Ebm-Papst Landshut Gmbh Versteiftes Gebläsegehäuseteil zur Anordnung an einem Gasgebläse
GB2606376A (en) * 2021-05-05 2022-11-09 Bosch Thermotechnology Ltd Uk Venturi-type mixing nozzle and combustion device with a Venturi-type mixing nozzle

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DE1551804A1 (de) * 1967-04-01 1970-03-26 Wilhelm Kornacker Mit Gas betriebener Brenner
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
IT1288006B1 (it) 1996-12-06 1998-09-10 Sit La Precisa Spa Dispositivo miscelatore aria-gas in particolare per bruciatori a gas con ventilazione forzata.
DE19729047C1 (de) * 1997-07-08 1998-09-24 Honeywell Bv Mischvorrichtung zur Erzeugung eines Gemisches aus Gas und Verbrennungsluft für einen Brenner
DE19733769C2 (de) * 1997-08-05 2003-05-22 Dungs Karl Gmbh & Co Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
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US5971026A (en) * 1997-12-09 1999-10-26 Honeywell Inc. Internal geometry shape design for venturi tube-like gas-air mixing valve
DE19925567C1 (de) * 1999-06-04 2000-12-14 Honeywell Bv Vorrichtung für Gasbrenner
IT1315743B1 (it) 2000-10-03 2003-03-18 Sit La Precisa Spa Dispositivo miscelatore aria-gas perfezionato.
DE10324706B3 (de) * 2003-05-30 2004-12-02 Hovalwerk Ag Vorrichtung zum Regeln des Gas/Luft-Verhältnisses für eine vormischende Verbrennungseinrichtung
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Also Published As

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

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