EP2686609A2 - 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

Info

Publication number
EP2686609A2
EP2686609A2 EP12705644.8A EP12705644A EP2686609A2 EP 2686609 A2 EP2686609 A2 EP 2686609A2 EP 12705644 A EP12705644 A EP 12705644A EP 2686609 A2 EP2686609 A2 EP 2686609A2
Authority
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.)
Granted
Application number
EP12705644.8A
Other languages
German (de)
English (en)
Other versions
EP2686609B1 (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
Original Assignee
Ebm Papst Landshut 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 Ebm Papst Landshut GmbH filed Critical Ebm Papst Landshut GmbH
Publication of EP2686609A2 publication Critical patent/EP2686609A2/fr
Application granted granted Critical
Publication of EP2686609B1 publication Critical patent/EP2686609B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

  • Mixing device for mixing combustion air and gas for a
  • 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.
  • WO 2005/078343 A1 discloses a mixing device for mixing gas and combustion air for a gas burner, which has 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.
  • EP 0 846 916 A2 discloses a combustion air and gas mixing device having a venturi nozzle body in a double-cone shape arranged 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 arranged upstream swirl generating device for the combustion air is disclosed in WO 02/29319 A
  • the known from the prior art mixing devices are each connected to a gas heater of predetermined power, wherein the output of the gas heater power depends substantially on the provided by the mixing device amount of fuel (gas) and air.
  • 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 expensive.
  • a mixing device for mixing combustion air and gas for a gas appliance or a gas heater is provided with a housing connected thereto gas supply, a nozzle insert disposed in the housing having a predetermined fürströmungs- cross-sectional area, wherein the housing has an inlet region comprising 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, the flow cross-sectional area can be adjusted according to the necessary capacity of the gas heater.
  • the housing and its inlet area are therefore the same for all performance sizes, eliminating the need to provide different housings for different performance sizes.
  • the housing is made of aluminum that the gas valve can be attached or flanged directly to the housing.
  • custom housing forms with the housing usually produced in the die-casting process with accordingly customized diecasting tools per power range.
  • the housing shape in the inlet region for all power ranges always remains the same, the same die casting tool can always be used, whereby the manufacturing costs of Mischvorrich- 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.
  • a 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 causes the throughflow cross-sectional area of the nozzle insert to be reduced in such a way 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 can be adapted via the diameter of the displacement body and the concomitant reduction in the flow cross-sectional area of the nozzle insert, with the power decreasing with increasing diameter of the displacement body. Also favors the projection of the
  • Displacer a hollow body, 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 on-ZuWerkzeug without slide in the injection molding process 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 it is provided that it is connected to a blower with blower housing such that the housing is formed integrally with the blower housing.
  • the mixing device is thus integrated into the blower, wherein the heating power can be adapted via the variability of the nozzle inserts and their variable flow cross-sectional area. Furthermore, with such a design eliminates the need to seal the mixing device to the fan housing. Leaks in the attachment between the housing and blower housing are thus excluded.
  • the nozzle insert is fastened to its housing at least in sections in a form-fitting manner, sealingly against the housing at its downstream end.
  • 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.
  • the inventive method is used to adjust the performance of a gas appliance or gas heater using the described mixing device, wherein the nozzle insert with a predetermined Naturalströmungs- cross-sectional area, if necessary using a nozzle insert with trained therein displacement, determining the power of the gas appliance or gas heater is inserted into the housing.
  • Fig. 3 is a perspective view of a nozzle insert.
  • the mixing device 1 shows a side sectional view of the mixing device 1 formed integrally on the blower housing 9, in which an unillustrated impeller draws in the combustion air and the gas in the flow direction S through the mixing device 1.
  • the blower housing 9 can be attached to a gas appliance.
  • the mixing device 1 comprises a Venturi nozzle 3, which is formed in sections from the housing 2 of the mixing device 1 and a nozzle insert 4 detachably inserted into the housing 2.
  • 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 illustrated embodiment is directed to gas appliances with relatively high heating capacities, in which relatively small amounts of combustion air and gas are conveyed.
  • FIG. 2 shows an embodiment of the mixing device 1 for lower powers, in which the throughflow cross-sectional area Q of the Venturi nozzle 3 is reduced in order to ensure sufficiently high flow rates in the region of the gas inlet openings 11.
  • a nozzle insert 4 is inserted, in whose 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 displacement body 5 is a hollow body whose downstream axial end 8 is open. Upstream, the displacer 5 extends beyond the axial end of the nozzle insert 4 and is tapered in the projecting portion 17, to ensure a division and early concern of the flow to the displacer 5 and the inner walls of the nozzle insert 4.
  • the displacer 5 has reached its maximum diameter in order to realize the maximum flow velocity in the area of the smallest cross-section of the venturi 3.
  • the axial extent of the displacement body 5 shown allows the greatest possible pressure recovery in the direction of flow S expanding outlet portion 13 of the nozzle insert 4 of the venturi 3.
  • the downstream axial end 8 of the displacer 5 is spaced from the downstream axial end 14 of the nozzle insert 4.
  • the nozzle insert 4 inserted into the housing 2 from the axially open downstream side sealingly engages the housing 2 and the blower housing 9 at its downstream edge portion 20, the housing 2 being fixed to the blower housing 9 together with the nozzle insert 4.
  • Fig. 3 the nozzle insert 4 shown in Fig.
  • the housing 2 and the blower 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 embodiment shown in Fig. 1 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 lifetime 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.

Landscapes

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

Abstract

L'invention concerne un dispositif de mélange pour mélanger de l'air de combustion et du gaz pour un appareil à gaz, comportant un boîtier auquel est raccordé une alimentation de gaz, et un insert de buse disposé dans le boîtier, présentant une surface de section transversale d'écoulement prédéterminée. Le boîtier comporte une zone d'entrée formant un segment d'entrée d'une buse de Venturi, qui s'amincit dans le sens d'écoulement, l'insert de buse formant au moins un segment de sortie s'élargissant dans le sens d'écoulement.
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 true EP2686609A2 (fr) 2014-01-22
EP2686609B1 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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020099107A1 (fr) * 2018-11-12 2020-05-22 Ebm-Papst Landshut Gmbh Ensemble soufflante comprenant une rainure d'étanchéité triangulaire fermée
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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3064778B1 (fr) * 2015-03-06 2022-02-16 ELICA S.p.A. Ventilateur radial avec dispositif de mélange air-gaz
DE102016113588A1 (de) * 2016-07-22 2018-01-25 Ebm-Papst Landshut Gmbh Gas-Luft-Mischvorrichtung
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

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US2068567A (en) * 1935-01-11 1937-01-19 Herbert R Palmer Air and gas mixer for gas burners
DE1551804A1 (de) * 1967-04-01 1970-03-26 Wilhelm Kornacker Mit Gas betriebener Brenner
DE8800711U1 (de) * 1988-01-22 1988-04-14 Motoren-Werke Mannheim AG, 6800 Mannheim Venturi-Mischer zum Mischen von Gas und Luft insbesondere für einen Verbrennungsmotor
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
DE19733767A1 (de) * 1997-08-05 1999-02-11 Dungs Karl Gmbh & Co Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
DE19733769C2 (de) * 1997-08-05 2003-05-22 Dungs Karl Gmbh & Co Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
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
DE102004007123B3 (de) 2004-02-12 2005-08-18 Honeywell B.V. Mischvorrichtung zum Mischen von Gas und Verbrennungsluft für einen Gasbrenner sowie Gasbrenner

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See references of WO2012123207A2 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020099107A1 (fr) * 2018-11-12 2020-05-22 Ebm-Papst Landshut Gmbh Ensemble soufflante comprenant une rainure d'étanchéité triangulaire fermée
CN112955666A (zh) * 2018-11-12 2021-06-11 依必安派特兰茨胡特有限公司 包括封闭式三角密封槽的风扇装置
CN112955666B (zh) * 2018-11-12 2022-09-23 依必安派特兰茨胡特有限公司 包括封闭式三角密封槽的风扇装置
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

Also Published As

Publication number Publication date
EP2686609B1 (fr) 2019-04-03
DE102011014117A1 (de) 2012-09-20
WO2012123207A3 (fr) 2013-12-12
TR201906191T4 (tr) 2019-05-21
WO2012123207A2 (fr) 2012-09-20

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