EP0846916A2 - Luft-Gasmischvorrichtung insbesondere für Gebläsebrenner - Google Patents

Luft-Gasmischvorrichtung insbesondere für Gebläsebrenner Download PDF

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Publication number
EP0846916A2
EP0846916A2 EP97201892A EP97201892A EP0846916A2 EP 0846916 A2 EP0846916 A2 EP 0846916A2 EP 97201892 A EP97201892 A EP 97201892A EP 97201892 A EP97201892 A EP 97201892A EP 0846916 A2 EP0846916 A2 EP 0846916A2
Authority
EP
European Patent Office
Prior art keywords
gas
venturi
air
duct
venturi duct
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.)
Ceased
Application number
EP97201892A
Other languages
English (en)
French (fr)
Other versions
EP0846916A3 (de
Inventor
Armando Previato
Daniele Sacchi
Gianpiero Turrin
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 La Precisa SpA
Original Assignee
Sit La Precisa SpA
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 Sit La Precisa SpA filed Critical Sit La Precisa SpA
Publication of EP0846916A2 publication Critical patent/EP0846916A2/de
Publication of EP0846916A3 publication Critical patent/EP0846916A3/de
Ceased legal-status Critical Current

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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

Definitions

  • the subject of the present invention is an air-gas mixing device, particularly for gas burners with forced ventilation, of the type comprising a Venturi duct inside which a portion having a restricted cross-section is defined and outside which a gas-distribution chamber is defined, gas-induction passageways opening in the wall of the portion with the restricted cross-section, between the gas-distribution chamber and the interior of the Venturi duct.
  • Devices of the aforementioned type are well known commercially; they normally comprise a valve unit for supplying gas into the Venturi duct (in short the "Venturi") at a pressure controlled in dependence on the air-pressure detected therein, and a fan which is normally located downstream of the Venturi duct, into which the air and gas mixture is drawn.
  • the location of the fan downstream of the Venturi is selected to improve the homogeneity of the air-gas mixture produced in the Venturi duct and supplied to the burner. In practice, the fan homogenizes this mixture as a result of the mixing and turbulence brought about inside it.
  • the gas-induction passageways are normally oriented radially.
  • an air-gas mixing device particularly for gas burners with forced ventilation, formed in accordance with the present invention, comprises a fan 1, to the output opening of which are connected a tubular duct 2, a Venturi duct 3 formed in the tubular duct 2, and a valve unit 4 for supplying gas to the Venturi 3 at a pressure controlled in dependence on the air-pressure detected in the duct 2 upstream of the Venturi.
  • the air-pressure is detected through a first hole 5 opening into the tubular duct 2 and indicated schematically by the arrow 6 which leads to the valve unit 4.
  • the arrow 7 indicates the supply of gas from the external gas mains to the valve unit 4, and the arrow 8 indicates the delivery of gas, controlled by the valve unit, to a hole 9 in the tubular duct 2.
  • the Venturi 3 is defined by the machining of the axial duct inside a sleeve-like body 10 in the form of a double cone; it comprises a first, inlet portion 11, a second, intermediate portion 12 with a restricted cross-section, and a third, outlet portion 13.
  • the intermediate portion 12 with the restricted cross-section is that in which the gas passing through the Venturi has the greatest speed and the lowest pressure.
  • the sleeve-like body 10 is engaged sealingly in the tubular duct 2 by means of an O-ring seal 14 and is in abutment with a small shoulder 15 at the end facing towards the fan 1. In the region of the portion 12 with the restricted cross-section, it has a narrower outer portion defining, with the surface of the tubular duct 2, a gas-distribution chamber 16.
  • the body 10 has a series of four ribs 17a, b, c, d defining the same number of recesses 18a, b, c, d, the bases of which are flat, are rectangular in plan, and form respective shoulders indicated 19a, b, c, d.
  • the shoulders 19a-d are arranged substantially at right angles to the axis X-X of the Venturi 3 in the region of the downstream end (with reference to the direction of the air-flow through the Venturi, indicated by the arrow F) of the portion 12 with the restricted cross-section.
  • a respective indentation 20a-d with a cylindrical surface having an axis substantially parallel to the axis X-X of the Venturi is formed on the internal wall of the sleeve-like body 10, that is, the wall defining the Venturi 3, for each of the shoulders 19a-d, starting from its wall. Owing to the taper of the third portion 13 of the Venturi, the cross-sections of the indentations 20a-d decrease progressively in the direction of flow F.
  • a slot 21a-d opening in the respective shoulder 19a-d is formed at the base of each indentation 20a-d, owing to its intersection with the corresponding recess 18a-d.
  • the slots 21a-d define, with the respective indentations 20a-d, the same number of passageways for the induction of gas from the gas-distribution chamber 16 into the Venturi 3.
  • the openings of the gas-induction passageways into the Venturi 3 are distributed equiangularly.
  • the slots 21a-d lie in a plane perpendicular to the axis X-X of the Venturi duct 3 and, because of the positions of the indentations 20a-d, cause the orientations of the gas-induction passageways to have a predominant axial component, in contrast with the typically radial orientation of the gas-induction passageways in the curved surfaces of Venturis formed according to the prior art.
  • FIGS 3 and 4 show a variant of the device of the invention. Details similar to those of the preceding embodiment are indicated by the same reference numerals.
  • This variant differs from the embodiment just described mainly in that, instead of being formed by the machining of a sleeve-like body, the Venturi duct 3 is produced by the manufacture of a thin-walled, double funnel-shaped body 100.
  • the gas-induction passageways, generally indicated 101a, b, c, d are consequently formed by local deformation of the wall of the body 100 and punching of the slots 102a, b, c, d.
  • the advantages of the invention is the fact that, by virtue of the improved air-gas mixing, the fan can be located upstream of the mixing region, so that only air passes through it and all of the problems relating to the movement of air-gas mixtures are consequently avoided.
  • fans made of plastics material can be used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
EP97201892A 1996-12-06 1997-06-20 Luft-Gasmischvorrichtung insbesondere für Gebläsebrenner Ceased EP0846916A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD960300 1996-12-06
IT96PD000300A IT1288006B1 (it) 1996-12-06 1996-12-06 Dispositivo miscelatore aria-gas in particolare per bruciatori a gas con ventilazione forzata.

Publications (2)

Publication Number Publication Date
EP0846916A2 true EP0846916A2 (de) 1998-06-10
EP0846916A3 EP0846916A3 (de) 1999-02-10

Family

ID=11391594

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97201892A Ceased EP0846916A3 (de) 1996-12-06 1997-06-20 Luft-Gasmischvorrichtung insbesondere für Gebläsebrenner

Country Status (3)

Country Link
EP (1) EP0846916A3 (de)
DE (1) DE846916T1 (de)
IT (1) IT1288006B1 (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002029319A1 (en) * 2000-10-03 2002-04-11 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
WO2005078343A1 (de) * 2004-02-12 2005-08-25 Honeywell Technologies Sarl Mischvorrichtung zum mischen von gas und verbrennungsluft für einen gasbrenner sowie gasbrenner
KR100669884B1 (ko) 2004-09-25 2007-01-18 주식회사 롯데기공 가스연료연소용 예혼합기
ES2300160A1 (es) * 2004-03-26 2008-06-01 Arturo Bernal Granero Mejoras introducidas en la patente de invencion p200400754 por grupo alimentador de combustible/comburente para cocinas de gas y similar.
WO2012123207A2 (de) 2011-03-15 2012-09-20 Ebm-Papst Landshut Gmbh Mischvorrichtung zur mischung von verbrennungsluft und gas für ein gasgerät
WO2012006166A3 (en) * 2010-06-29 2012-12-06 A.O. Smith Corporation Blower assembly with venturi -mixer for use with gas powered appliance
US8668491B2 (en) 2009-10-06 2014-03-11 Honeywell Technologies Sarl Regulating device for gas burners
EP2258983A3 (de) * 2009-06-05 2014-09-03 Honeywell Technologies Sarl Mischvorrichtung für einen Gasbrenner
JP2015230113A (ja) * 2014-06-04 2015-12-21 リンナイ株式会社 予混合装置
WO2018015130A1 (de) * 2016-07-22 2018-01-25 Ebm-Papst Landshut Gmbh Gas-luft-mischvorrichtung
GB2605388A (en) * 2021-03-30 2022-10-05 Bosch Thermotechnology Ltd Uk Venturi-type mixing nozzle and combustion device with a Venturi-type mixing nozzle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010010791A1 (de) 2010-03-09 2011-09-15 Honeywell Technologies Sarl Mischvorrichtung für einen Gasbrenner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033714A (en) * 1972-04-17 1977-07-05 Radiation Limited Gaseous fuel burners
WO1994009326A1 (de) * 1992-10-09 1994-04-28 Hynek Mikusek Misch- und wärmetauschsystem an kondensationsgaskesseln
EP0685684A2 (de) * 1994-06-03 1995-12-06 Buderus Heiztechnik GmbH Atmosphärischer Gasbrenner
NL1000129C1 (en) * 1995-04-12 1996-05-13 Atag Verwarming Bv Central heating boiler fired by gas - has forced gas and air mixing venturi system controlled by electronic circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033714A (en) * 1972-04-17 1977-07-05 Radiation Limited Gaseous fuel burners
WO1994009326A1 (de) * 1992-10-09 1994-04-28 Hynek Mikusek Misch- und wärmetauschsystem an kondensationsgaskesseln
EP0685684A2 (de) * 1994-06-03 1995-12-06 Buderus Heiztechnik GmbH Atmosphärischer Gasbrenner
NL1000129C1 (en) * 1995-04-12 1996-05-13 Atag Verwarming Bv Central heating boiler fired by gas - has forced gas and air mixing venturi system controlled by electronic circuit

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002029319A1 (en) * 2000-10-03 2002-04-11 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
WO2005078343A1 (de) * 2004-02-12 2005-08-25 Honeywell Technologies Sarl Mischvorrichtung zum mischen von gas und verbrennungsluft für einen gasbrenner sowie gasbrenner
ES2300160A1 (es) * 2004-03-26 2008-06-01 Arturo Bernal Granero Mejoras introducidas en la patente de invencion p200400754 por grupo alimentador de combustible/comburente para cocinas de gas y similar.
KR100669884B1 (ko) 2004-09-25 2007-01-18 주식회사 롯데기공 가스연료연소용 예혼합기
EP2258983A3 (de) * 2009-06-05 2014-09-03 Honeywell Technologies Sarl Mischvorrichtung für einen Gasbrenner
US8668491B2 (en) 2009-10-06 2014-03-11 Honeywell Technologies Sarl Regulating device for gas burners
WO2012006166A3 (en) * 2010-06-29 2012-12-06 A.O. Smith Corporation Blower assembly with venturi -mixer for use with gas powered appliance
DE102011014117A1 (de) 2011-03-15 2012-09-20 Ebm-Papst Landshut Gmbh Mischvorrichtung zur Mischung von Verbrennungsluft und Gas für ein Gasgerät
WO2012123207A2 (de) 2011-03-15 2012-09-20 Ebm-Papst Landshut Gmbh Mischvorrichtung zur mischung von verbrennungsluft und gas für ein gasgerät
JP2015230113A (ja) * 2014-06-04 2015-12-21 リンナイ株式会社 予混合装置
US10030868B2 (en) 2014-06-04 2018-07-24 Rinnai Corporation Premixing apparatus
WO2018015130A1 (de) * 2016-07-22 2018-01-25 Ebm-Papst Landshut Gmbh Gas-luft-mischvorrichtung
DE102016113588A1 (de) * 2016-07-22 2018-01-25 Ebm-Papst Landshut Gmbh Gas-Luft-Mischvorrichtung
EP3488148B1 (de) * 2016-07-22 2021-02-17 EBM-PAPST Landshut GmbH Gas-luft-mischvorrichtung
GB2605388A (en) * 2021-03-30 2022-10-05 Bosch Thermotechnology Ltd Uk Venturi-type mixing nozzle and combustion device with a Venturi-type mixing nozzle
EP4067743A1 (de) * 2021-03-30 2022-10-05 Bosch Thermotechnology Ltd (UK) Venturiartige mischdüse und verbrennungsvorrichtung mit einer venturiartigen mischdüse

Also Published As

Publication number Publication date
ITPD960300A1 (it) 1998-06-06
EP0846916A3 (de) 1999-02-10
IT1288006B1 (it) 1998-09-10
DE846916T1 (de) 1998-10-22

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