EP2278224A2 - Mélangeur air/gaz, en particulier pour brûleur à prémélange - Google Patents

Mélangeur air/gaz, en particulier pour brûleur à prémélange Download PDF

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Publication number
EP2278224A2
EP2278224A2 EP10169982A EP10169982A EP2278224A2 EP 2278224 A2 EP2278224 A2 EP 2278224A2 EP 10169982 A EP10169982 A EP 10169982A EP 10169982 A EP10169982 A EP 10169982A EP 2278224 A2 EP2278224 A2 EP 2278224A2
Authority
EP
European Patent Office
Prior art keywords
conduit
axis
section
flow
rotation
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
EP10169982A
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German (de)
English (en)
Other versions
EP2278224B1 (fr
EP2278224A3 (fr
Inventor
Antonio Ranalli
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.)
Sit SpA
Original Assignee
LN 2 Srl a socio unico
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Application filed by LN 2 Srl a socio unico filed Critical LN 2 Srl a socio unico
Publication of EP2278224A2 publication Critical patent/EP2278224A2/fr
Publication of EP2278224A3 publication Critical patent/EP2278224A3/fr
Application granted granted Critical
Publication of EP2278224B1 publication Critical patent/EP2278224B1/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
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
    • 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
    • F23D14/46—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
    • 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 present invention relates to an air-gas mixer device, in particular for premix burner equipment, having the features mentioned in the preamble of the main claim No. 1.
  • Devices of the aforesaid type are used particularly in gas burner equipment for premix condensing boilers in which a combustible air-gas mixture is premixed upstream of the combustion head of the burner.
  • Typical applications provide for the use of mixers in which conduits are provided having variations of cross section which are suitable creating a pressure drop correlated to the flow rate of air which passes through the conduit in such a way as to generate a signal to the gas supply valve for the correct delivery of the fuel.
  • Venturi effect tubular conduits are known in which the gas is delivered at the constricted section of the conduit according to the pressure drop signal generated by the flow of air. Since it is generally necessary to calibrate the mixer device according to the specific power range of the boiler, provision is made for some parts of the geometry of the device to be exchangeable.
  • the Venturi effect tubular conduit may comprise a fixed outer casing and an inner Venturi conduit exchangeable for another conduit according to the powers required.
  • the invention lies preferably in this specific field of mixer devices incorporated in fan units, and has as its principal aim that of providing an air-gas mixer device structurally and functionally designed to improve the efficiency and simplify the adjustment thereof according to the power range required of the burner, and at the same time having a greater structural compactness compared with known solutions.
  • the reference 1 indicates as a whole an air-gas mixer device, particularly designed for premix gaseous fuel burners, and produced according to the invention.
  • the device is arranged to receive the flows of air and gas admitted into the device, and to mix those flows so as to form a combustible air-gas mixture intended to be fed to the intake section of a centrifugal fan 2, which is itself arranged to deliver the fuel mixture on the delivery side to a combustion head of a gas burner, not shown.
  • the invention preferably finds an application in the premixing of air-gas intended for the burners of condensing boilers.
  • the mixer device 1 and the fan are operatively associated with each other and are also disposed, in succession with each other, in an axial direction X.
  • the axis X additionally forms the axis of rotation of the impeller 2a of the fan 2, which impeller is housed in a manifold 3, for example of the volute type, provided with an axial intake section 3a and a delivery section 3b, which is spaced apart from the axis X, at the outer diameter of the impeller.
  • the intake section 3a is conveniently configured as a circular opening coaxial with the axial direction X.
  • the mixer device comprises guide means for the flow introduced into it which are of the centripetal type, that is to say, are designed to guide the flow, admitted in a position spaced apart from the axis X, in the direction of said axis with a substantially centripetal movement, towards the intake section 3a, as will become clear from the following detailed description.
  • Said guide means comprise a guide conduit structure indicated as a whole by 5, which has an axially symmetrical configuration, with the main axis of symmetry coinciding with the axis X, wherein said axially symmetrical configuration is defined by the rotation, about the axis X, of a flat section on whose plane the axis X itself lies.
  • This section illustrated in detail in Figure 2 , is radially positioned with respect to the axis X, is spaced apart from said axis and has respective converging and diverging portions, indicated respectively by 5a, 5b, between which a constricted section 5c is delimited. The direction of flow at the section 5c is therefore substantially radial to the axis X.
  • the flat section therefore defines the cross section of the axially symmetrical Venturi effect conduit 5, in which the portion 5a converges with respect to the flow direction (directed from the end furthest from the axis X towards the opposed axial region) and is also prolonged in the intermediate zone of constricted cross section 5c, which is itself prolonged in the diverging portion 5b coming out of the Venturi.
  • an opening 6 is provided, formed in the guide conduit 5, and through which the gas is injected in the mixing zone of the conduit itself.
  • the intermediate zone of constricted cross section is that in which the flow of air passing through the Venturi is at the greater speed and the lower pressure, and the pressure drop signal generated serves to control the gas valve in a correlated manner to deliver a suitable gas flow rate in the mixing zone.
  • the opening 6 has an arcuate shape along the corresponding circumferential profile of the Venturi conduit, the opening being placed in communication with a tubular formation 6a via which the combustible gas is fed to the mixer.
  • the guide conduit 5 is delimited internally by a pair of surfaces 8, 9 axially opposed to each other in a position facing each other and configured in such a way as to define the sequence of the converging, constricted and diverging portions in order to ensure the Venturi effect.
  • one of the two surfaces, that which is designated by 8, is defined by a part of the manifold 3 of the fan, while the opposed surface 9 is defined in a discoid body 10, separate from the volute manifold 3 and coaxially disposed on the manifold itself.
  • Said body 10 is secured to the manifold so as to be rotatable, at least to a limited extent, about the axis X so that relative rotation, about the axis X, is permitted between the surfaces 8, 9 for the functional purpose which will become clear hereinafter.
  • the axially symmetrical profile of the guide conduit 5 may involve only a portion of the entire circumferential profile, as illustrated in Figure 3 , where A indicates the angle in which the Venturi effect section of the conduit 5 extends.
  • a preferred choice provides for the angle A to be between 90° and 180°.
  • the size of the passage cross section for the flow through the conduit 5, extending along the profile angularly delimited by the angle A, may be selectively reduced in order to adjust the flow rate of air admitted into the fan, consequently modulating the power in a predetermined range of values preselected according to the requirements of thermal power at the burner.
  • means for reducing the passage cross section comprise a wall 12 with cylindrical profile provided in the body 10, and suitable for co-operating with the profile of the constricted section 5c of the conduit 5 in order to intercept same, as a result of a relative rotational movement between the surfaces 8, 9, as shown in the drawings.
  • the reference 13 indicates the attachment region of the conduit which feeds the air from outside to the mixer, having a "segment" configuration extending along part of the circumferential profile of the conduit 5.
  • the reference 13 indicates the attachment region of the conduit which feeds the air from outside to the mixer, having a "segment" configuration extending along part of the circumferential profile of the conduit 5.
  • the operative position shown in Figure 5 there is no reduction of the flow.
  • One or more relative angular positions may be provided between the surfaces 8, 9, correlated to respective different degrees of reduction, with which the mixer may be configured.
  • Figure 4 shows pairs of threaded holes 14, 14' provided in the manifold and co-operating with holes 15 provided in the body 10 for the aforesaid screw connection, once the preselected reduction configuration is identified.
  • approximately continuous adjustment of the degree of reduction may be provided, for example selectable between two or more predetermined end positions.
  • the upper body 10 may be formed in one piece, arranged to be rotatably secured to the manifold 3 about the axis X.
  • the reference 16 further indicates a projection with cylindrical profile rising vertically from the surface portion of the manifold 3 defining the conduit 5, said projection making it possible to increase the performance of the Venturi conduit, since it ensures a greater pressure drop in parity with losses of head.
  • a principal advantages lies in the functional simplification introduced into the mixer according to the invention, in which, owing to an axially symmetrical configuration of the Venturi effect guide conduit, it is possible to provide for a reduction of the flow obtainable simply by rotating one component with respect to the structure of the manifold, without therefore requiring parts which can be substituted or interchanged according to the different powers required of the burner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Gas Burners (AREA)
  • Feeding And Controlling Fuel (AREA)
EP20100169982 2009-07-22 2010-07-19 Mélangeur air/gaz, en particulier pour brûleur à prémélange Active EP2278224B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITPD2009A000215A IT1395189B1 (it) 2009-07-22 2009-07-22 Dispositivo miscelatore aria-gas, particolarmente per apparecchi bruciatori a pre-miscelazione.

Publications (3)

Publication Number Publication Date
EP2278224A2 true EP2278224A2 (fr) 2011-01-26
EP2278224A3 EP2278224A3 (fr) 2013-02-27
EP2278224B1 EP2278224B1 (fr) 2014-12-17

Family

ID=41796107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100169982 Active EP2278224B1 (fr) 2009-07-22 2010-07-19 Mélangeur air/gaz, en particulier pour brûleur à prémélange

Country Status (2)

Country Link
EP (1) EP2278224B1 (fr)
IT (1) IT1395189B1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20110372A1 (it) * 2011-11-24 2013-05-25 Ln 2 Srl Socio Unico Dispositivo miscelatore aria-gas per bruciatori a gas combustibile con pre-miscelazione
ITPD20130189A1 (it) * 2013-07-05 2015-01-06 Sit La Precisa S P A Con Socio Uni Co Dispositivo miscelatore aria-gas per apparecchi bruciatori a pre-miscelazione
EP3015768A1 (fr) * 2014-10-29 2016-05-04 Honeywell Technologies Sarl Ensemble comprenant une soupape à gaz, un ventilateur, un mélangeur gaz/air et une fenêtre de brûleur
EP3531017A1 (fr) * 2018-02-26 2019-08-28 Honeywell Technologies Sarl Dispositif de mélange gaz/air destiné à un brûleur à gaz et ensemble comprenant un dispositif de mélange gaz/air et un ventilateur
EP3597998A3 (fr) * 2018-07-19 2020-03-25 Brunswick Corporation Dispositif de brûleur de prémélange à tirage forcé pour un chauffage de véhicule
CN110966602A (zh) * 2018-09-30 2020-04-07 宁波方太厨具有限公司 一种用于燃气灶的燃烧器
CN111042869A (zh) * 2019-12-24 2020-04-21 哈尔滨工程大学 一种使用直导流叶片的轴向进气方式的小型向心涡轮
US11608983B2 (en) 2020-12-02 2023-03-21 Brunswick Corporation Gas burner systems and methods for calibrating gas burner systems
US11608984B1 (en) 2017-11-30 2023-03-21 Brunswick Corporation Systems for avoiding harmonic modes of gas burners
US11933250B2 (en) 2020-07-28 2024-03-19 Cummins Inc. Gaseous fuel-air mixer with higher mixture uniformity
US11940147B2 (en) 2022-06-09 2024-03-26 Brunswick Corporation Blown air heating system

Family Cites Families (13)

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US2603411A (en) * 1948-02-28 1952-07-15 Trumpa Ewald Blower inlet control device
US2905375A (en) * 1958-01-14 1959-09-22 Hanus John Air mixing and flow control device
DE4341126C2 (de) * 1993-12-03 1998-01-22 Viessmann Werke Kg Gas-Vormischbrenner, insbesondere Strahlungsbrenner für Heizkessel
JPH08128609A (ja) * 1994-10-31 1996-05-21 Miura Co Ltd 燃料ガス混合機構を備えた送風機
EP0834695B1 (fr) * 1996-10-03 1999-09-01 Siabs Industry S.R.L. Dispositif pour l'alimentation en mélange air et gaz d'un brûleur, notamment pour appareils de chauffage
DE19733769C2 (de) * 1997-08-05 2003-05-22 Dungs Karl Gmbh & Co Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
ITPD20010023A1 (it) * 2001-02-01 2002-08-01 Sit La Precisa Spa Dispositivo miscelatore aria-gas perfezionato.
AU2002306234B2 (en) * 2002-04-30 2008-03-06 Sit La Precisa S.P.A. An air-gas mixer device, particulary for gas burners and similar apparatus
US7093445B2 (en) * 2002-05-31 2006-08-22 Catalytica Energy Systems, Inc. Fuel-air premixing system for a catalytic combustor
GB0230070D0 (en) * 2002-12-23 2003-01-29 Bowman Power Systems Ltd A combustion device
DE10324706B3 (de) * 2003-05-30 2004-12-02 Hovalwerk Ag Vorrichtung zum Regeln des Gas/Luft-Verhältnisses für eine vormischende Verbrennungseinrichtung
DE10349344B3 (de) * 2003-10-23 2005-06-30 Ebm-Papst Landshut Gmbh Gebläse mit Laminar-Element vor der Ansaugöffnung
DE102007022008B4 (de) * 2007-05-08 2009-02-26 Saia-Burgess Dresden Gmbh Kombinierte Lüfter-/Gasventileinheit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2597369A1 (fr) * 2011-11-24 2013-05-29 LN 2 S.R.L. a socio unico Dispositif de mélange air-gaz pour brûleurs à gaz avec prémélange
ITPD20110372A1 (it) * 2011-11-24 2013-05-25 Ln 2 Srl Socio Unico Dispositivo miscelatore aria-gas per bruciatori a gas combustibile con pre-miscelazione
ITPD20130189A1 (it) * 2013-07-05 2015-01-06 Sit La Precisa S P A Con Socio Uni Co Dispositivo miscelatore aria-gas per apparecchi bruciatori a pre-miscelazione
WO2015001438A1 (fr) * 2013-07-05 2015-01-08 Sit La Precisa S.P.A. Con Socio Unico Dispositif de mélange air-gaz pour équipement de brûleur à prémélange
CN105612386A (zh) * 2013-07-05 2016-05-25 西特股份公司 用于预混燃烧器设备的空气-燃气混合器装置
US9677761B2 (en) 2013-07-05 2017-06-13 Sit S.P.A. Air-gas mixer device for premix burner equipment
EP3015768A1 (fr) * 2014-10-29 2016-05-04 Honeywell Technologies Sarl Ensemble comprenant une soupape à gaz, un ventilateur, un mélangeur gaz/air et une fenêtre de brûleur
US11608984B1 (en) 2017-11-30 2023-03-21 Brunswick Corporation Systems for avoiding harmonic modes of gas burners
EP3531017A1 (fr) * 2018-02-26 2019-08-28 Honeywell Technologies Sarl Dispositif de mélange gaz/air destiné à un brûleur à gaz et ensemble comprenant un dispositif de mélange gaz/air et un ventilateur
EP3597998A3 (fr) * 2018-07-19 2020-03-25 Brunswick Corporation Dispositif de brûleur de prémélange à tirage forcé pour un chauffage de véhicule
EP3869098A1 (fr) * 2018-07-19 2021-08-25 Brunswick Corporation Dispositif de brûleur de prémélange à tirage forcé
US11441772B2 (en) 2018-07-19 2022-09-13 Brunswick Corporation Forced-draft pre-mix burner device
CN110966602A (zh) * 2018-09-30 2020-04-07 宁波方太厨具有限公司 一种用于燃气灶的燃烧器
CN111042869A (zh) * 2019-12-24 2020-04-21 哈尔滨工程大学 一种使用直导流叶片的轴向进气方式的小型向心涡轮
US11933250B2 (en) 2020-07-28 2024-03-19 Cummins Inc. Gaseous fuel-air mixer with higher mixture uniformity
US11608983B2 (en) 2020-12-02 2023-03-21 Brunswick Corporation Gas burner systems and methods for calibrating gas burner systems
US11940147B2 (en) 2022-06-09 2024-03-26 Brunswick Corporation Blown air heating system

Also Published As

Publication number Publication date
ITPD20090215A1 (it) 2011-01-23
EP2278224B1 (fr) 2014-12-17
EP2278224A3 (fr) 2013-02-27
IT1395189B1 (it) 2012-09-05

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