EP2442028A1 - Vorrichtung zum zuführen eines Luft-Gas-Gemisches - Google Patents

Vorrichtung zum zuführen eines Luft-Gas-Gemisches Download PDF

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Publication number
EP2442028A1
EP2442028A1 EP11184234A EP11184234A EP2442028A1 EP 2442028 A1 EP2442028 A1 EP 2442028A1 EP 11184234 A EP11184234 A EP 11184234A EP 11184234 A EP11184234 A EP 11184234A EP 2442028 A1 EP2442028 A1 EP 2442028A1
Authority
EP
European Patent Office
Prior art keywords
flange
air
feed assembly
mixing
gas mixture
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
EP11184234A
Other languages
English (en)
French (fr)
Other versions
EP2442028B1 (de
Inventor
Carlo Sacchi
Noe' Ciofolo
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.)
Riello SpA
Original Assignee
Riello SpA
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Filing date
Publication date
Application filed by Riello SpA filed Critical Riello SpA
Publication of EP2442028A1 publication Critical patent/EP2442028A1/de
Application granted granted Critical
Publication of EP2442028B1 publication Critical patent/EP2442028B1/de
Active legal-status Critical Current
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
    • 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
    • F23D14/34—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
    • 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
    • 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
    • F23L5/00—Blast-producing apparatus before the fire
    • F23L5/02—Arrangements of fans or blowers

Definitions

  • the present invention relates to a feed assembly for feeding an air/gas mixture.
  • this invention relates to a feed assembly for feeding an air/gas mixture to a burner of a gas boiler.
  • the air/gas feed assemblies are widely used in the field of gas-fired boilers for domestic use and, in particular in the field of gas-fired boilers of the condensing type.
  • a particularly common type of feed assembly for feeding an air/gas mixture defines a feed path for feeding an air/gas mixture and comprises an air/gas mixture mixing and modulating device defining a mixing region; and a suction conduit connected to the mixing and modulating device.
  • the mixing device is defined by a venturi tube which is axially connected to an air feeding conduit and in which, at the level of the minimum flow cross section, a flow of gas is injected.
  • the gas flow rate is regulated by a modulation valve, while the suction conduit is generally defined by the suction conduit of a fan whose speed can be modulated to vary the flow rate of the air/gas mixture.
  • the feed assemblies for feeding an air/gas mixture of the type identified above have proven able to provide an adequate flow modulation and to vary the composition ratio of air/gas mixture within a given range.
  • One purpose of the present invention is to provide a feed assembly that is free from the drawbacks of the prior art feed assemblies.
  • a feed assembly for feeding an air/gas mixture to a burner of a gas boiler is achieved; the feed assembly defining a feed path of the gas and air mixture comprising a device for mixing and modulating of the air/gas mixture defining a mixing region; and a suction conduit connected to the mixing and modulating device; the feed assembly being provided with at least an opening communicating with the outside, and arranged downstream of the mixing region.
  • the feed assembly for feeding an air/gas mixture is free from vibrations to any degree of modulation of the flow and for any air/gas ratio.
  • the opening extends in the proximity of the junction between the mixing and modulating device and the suction conduit.
  • the mixing and modulating device comprises a conduit provided with a first flange; and the suction conduit comprises a second flange; the first and second flanges being jointed to each other so as to form the plurality of openings between the first and second flange.
  • the first and second flanges have respective faces facing each other; the first and/or second flange having a number of projections along the first and/or second face, so as to define, when the first and second flange are tightened to each other, a number of openings, each extending between the first and second face and two projections.
  • the first and second flanges have, respectively, a first and second flat face facing each other; and a number of plates interposed between the first and second flange to define, when the plates are gripped between the first and second flange, a number of openings, each extending between the first and second flat face and two plates.
  • the feed assembly 1 is connected to an air feed conduit 2, to a gas feed conduit 3; and to a burner 4 and comprises essentially a mixing and modulating device 5; and a fan 6.
  • the air feed conduit 2 and the gas feed conduit 3 are connected to the mixing and modulating device 5, which in turn is fixed to the fan 6, which is connected to the burner 4.
  • the gas feed conduit 3 presents a modulating valve 7 connected to a control unit (of a known type and not illustrated in the attached figures) for the control of the burner 4 and of the fan 6.
  • the fan 6 comprises a suction conduit 8, which is jointed to the mixing and modulating device 5 and ends with a flange 9.
  • the fan 6 is a centrifugal fan of the type commonly used in gas-fired boilers, but for the purposes of the present invention may be of different types.
  • the mixing and modulating device 5 has a tubular shape, extending along an axis A and comprises a flange 10 configured to establish a connection with the flange 9; an attaching element 11 to establish a connection with the air feed conduit 2; and an attaching element 12 to establish a connection with the gas feed conduit 3.
  • the mixing and modulating device 5 comprises an outer tube 13, and an inner tube 14, coaxial, coupled to each other, and shaped to form between them an annular chamber 15, which is in communication with the gas feed conduit 3, and with the compartment of the inner tube 14 by way of two nozzles 16 facing and opposite to each other.
  • the inner tube 14 is shaped so as to give to the inner compartment the typical configuration of the venturi tube and has a separator septum 17 which divides in half the flow section.
  • the mixing and modulating device 5 comprises two bulkheads 18 and 19, arranged in series, hinged to the separator septum 17, and movable between a closed position in which they block half of the flow section and an open position, not shown.
  • the bulkheads 18 and 19 occupy the closed position under the action of their own weight and are arranged in the fully or partially open position as a function of the suction generated by the fan 6.
  • the feeding device 1 comprises at least one opening 20 arranged near the junction between the mixing and modulating device 5 and the suction conduit 8.
  • the opening 20 is arranged downstream of the mixing region, i.e. of the nozzles 16 and the bulkheads 18 and 19.
  • the tests performed by the applicant showed that the creation of an opening 20 near to the area shown eliminates vibration in all operating conditions.
  • the tests have given satisfactory results especially when the opening 20 extends in proximity of the junction between the mixing and modulating device 5 and the suction conduit 8.
  • the tests have given very positive feedback when the opening 20 extends as much as possible around the feed path P of the air/gas mixture. Therefore, the preferred embodiment of the invention comprises a plurality of openings 20 extending around the feed path P of the air/gas mixture.
  • the flange 9 and the flange 10 are jointed to each other so as to achieve a plurality of openings 20 between the flanges 9 and 10.
  • the flanges 9 and 10 have respective faces 21 and 22 facing each other, and tightened together by fasteners 23, in this case screws, each of which is engaged in a hole 24 and in a hole 25 respectively of the flange 9 and of the flange 10.
  • the flange 10 has a plurality of projections 26 along the face 22 so as to define, when the flanges 9 and 10 are fastened against each other, a series of openings 20, each of which extends between the first and second faces 21 and 22 and the two projections 26.
  • the openings 20 are in fact the annular gaps that have an axial dimension equal to the height of the two projections 26. Said axial dimension of the opening is of the order of tenths of a millimeter. In the specific case of a feed assembly with a fan with a maximum capacity of 70 kg/h, the axial dimension of the openings is about two tenths of a millimeter.
  • the face 22 of flange 10 is flat, while the projections 26 project from the face 21 of the flange 9.
  • the same reference numbers are used to define similar parts.
  • the flanges 9 and 10 have respective flat faces 27 and 28, parallel and facing each other and the openings 20 are made by way of plates 29 interposed between the faces 27 and 28 of the flanges 9 and 10.
  • the plates 29 are fastened between the flanges 9 and 10 a plurality of openings 20 are defined, each of which extends between the flanges 9 and 10 and two plates 29.
  • Each plate 29 is U-shaped and has two wings 30 connected by a base 31 so as to be fit on the flange 10.
  • the two wings 30 of each plate 29 have two respective holes 32 aligned with each other, which, in use, are aligned with holes 24 and 25 of the flanges 9 and 10 to allow the passage of the fasteners 23. In this way, through the use of fasteners 23 in the holes 32 the correct positioning of the plates 29 is ensured and their potential loosening is prevented.
  • the fan 5 sucks air in from air feed conduit 2 through the modulating mixing device and feeds the air/gas mixture to the burner 5.
  • the gas is injected from the two nozzles 16 within the modulating mixing device 5 where it mixes with the air.
  • the gas flow rate is regulated by the gas modulating valve 7, while the flow rate of the air/gas mixture and the position of the bulkheads 18 and 19 is regulated by the operating speed of the fan 6. In this way, it is possible to tune the air/gas mixture in a fine and stable way.
  • the pressure waves generated by the combined action of the fan 6, the bulkhead 18 and 19, and nozzles 16 are compensated and dampened by the openings 20 to the point of eliminating the vibrations induced in the entire feed assembly 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
EP11184234.0A 2010-10-12 2011-10-06 Vorrichtung zum zuführen eines Luft-Gas-Gemisches Active EP2442028B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2010A001865A IT1402023B1 (it) 2010-10-12 2010-10-12 Gruppo di alimentazione di una miscela aria/gas.

Publications (2)

Publication Number Publication Date
EP2442028A1 true EP2442028A1 (de) 2012-04-18
EP2442028B1 EP2442028B1 (de) 2016-03-02

Family

ID=43737994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11184234.0A Active EP2442028B1 (de) 2010-10-12 2011-10-06 Vorrichtung zum zuführen eines Luft-Gas-Gemisches

Country Status (3)

Country Link
EP (1) EP2442028B1 (de)
ES (1) ES2574243T3 (de)
IT (1) IT1402023B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015177735A1 (en) 2014-05-23 2015-11-26 Idea S.P.A. An integrated system for regulating and mixing comburent and fuel for a burner

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0559280A1 (de) 1992-03-06 1993-09-08 Atag Verwarming B.V. Gasdosiervorrichtung
EP0896191A2 (de) * 1997-08-05 1999-02-10 Karl Dungs GmbH & Co. Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
WO2002061336A1 (en) * 2001-02-01 2002-08-08 Sit La Precisa S.P.A. An improved air-gas mixer device
WO2002077526A1 (en) * 2001-03-23 2002-10-03 Sit La Precisa S.P.A. A system for connecting an air-gas mixing device to a fan, particularly for gas boilers and similar apparatus
DE10119598A1 (de) 2001-04-21 2002-10-24 Bosch Gmbh Robert Vorrichtung zum Mischen von Gas und Luft für ein Gasheizgerät
US6604938B1 (en) 1999-06-04 2003-08-12 Honeywell B.V. Device for gas burners
DE102007022008A1 (de) * 2007-05-08 2008-11-13 Saia-Burgess Dresden Gmbh Kombinierte Lüfter-/Gasventileinheit
WO2009133451A2 (en) 2008-04-30 2009-11-05 Gas Point S.R.L. Premix gas burner
EP2163820A1 (de) * 2008-09-16 2010-03-17 Siemens Building Technologies HVAC Products GmbH Gasbrenner

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0559280A1 (de) 1992-03-06 1993-09-08 Atag Verwarming B.V. Gasdosiervorrichtung
EP0896191A2 (de) * 1997-08-05 1999-02-10 Karl Dungs GmbH & Co. Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
US6604938B1 (en) 1999-06-04 2003-08-12 Honeywell B.V. Device for gas burners
WO2002061336A1 (en) * 2001-02-01 2002-08-08 Sit La Precisa S.P.A. An improved air-gas mixer device
WO2002077526A1 (en) * 2001-03-23 2002-10-03 Sit La Precisa S.P.A. A system for connecting an air-gas mixing device to a fan, particularly for gas boilers and similar apparatus
DE10119598A1 (de) 2001-04-21 2002-10-24 Bosch Gmbh Robert Vorrichtung zum Mischen von Gas und Luft für ein Gasheizgerät
DE102007022008A1 (de) * 2007-05-08 2008-11-13 Saia-Burgess Dresden Gmbh Kombinierte Lüfter-/Gasventileinheit
WO2009133451A2 (en) 2008-04-30 2009-11-05 Gas Point S.R.L. Premix gas burner
EP2163820A1 (de) * 2008-09-16 2010-03-17 Siemens Building Technologies HVAC Products GmbH Gasbrenner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015177735A1 (en) 2014-05-23 2015-11-26 Idea S.P.A. An integrated system for regulating and mixing comburent and fuel for a burner

Also Published As

Publication number Publication date
IT1402023B1 (it) 2013-08-28
ES2574243T3 (es) 2016-06-16
ITMI20101865A1 (it) 2012-04-13
EP2442028B1 (de) 2016-03-02

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