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WO2006053537A1 - Bruleur pour un appareil de chauffage presentant un ecran thermique ameliore - Google Patents

Bruleur pour un appareil de chauffage presentant un ecran thermique ameliore Download PDF

Info

Publication number
WO2006053537A1
WO2006053537A1 PCT/DE2005/002053 DE2005002053W WO2006053537A1 WO 2006053537 A1 WO2006053537 A1 WO 2006053537A1 DE 2005002053 W DE2005002053 W DE 2005002053W WO 2006053537 A1 WO2006053537 A1 WO 2006053537A1
Authority
WO
WIPO (PCT)
Prior art keywords
burner
heat shield
fuel
combustion chamber
burner according
Prior art date
Application number
PCT/DE2005/002053
Other languages
German (de)
English (en)
Inventor
Michael PÖHNER
Friedrich Widemann
Steffen Weber
Jan Steffens
Original Assignee
Webasto Ag
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 Webasto Ag filed Critical Webasto Ag
Priority to DE112005003408T priority Critical patent/DE112005003408A5/de
Priority to EP05806923A priority patent/EP1812749A1/fr
Priority to US11/719,580 priority patent/US20090220903A1/en
Priority to CA002595016A priority patent/CA2595016A1/fr
Priority to JP2007541668A priority patent/JP2008520947A/ja
Publication of WO2006053537A1 publication Critical patent/WO2006053537A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/40—Mixing tubes or chambers; Burner heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D9/00—Burners in which a stream of liquid fuel impinges intermittently on a hot surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/40—Mixing tubes or chambers; Burner heads
    • F23D11/406—Flame stabilising means, e.g. flame holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/40—Mixing tubes or chambers; Burner heads
    • F23D11/408—Flow influencing devices in the air tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/11401—Flame intercepting baffles forming part of burner head

Definitions

  • the invention relates to a burner for a heater, in particular for use in motor vehicles, having a burner nozzle for supplying fuel and primary air, a combustion chamber and a heat shield between the burner nozzle and the combustion chamber, the heat shield having openings for supplying secondary air into it having the combustion chamber.
  • Such burners which are also referred to as atomizing burners or as spray burners, are used in particular in auxiliary heaters and auxiliary heaters for motor vehicles.
  • auxiliary heaters and auxiliary heaters for motor vehicles.
  • the object of the invention is to at least partially overcome the described problems of the prior art and, in particular, to enable a reliable and low-emissivity or low-smoke starting behavior with different installation positions.
  • the invention builds on the generic burner in that the openings are equipped with air guide elements.
  • a heat shield is generally useful for shielding the nozzle and fuel supply from the heat energy present in the combustion chamber. Secondary air continues to be fed into the combustion chamber via the heat shield.
  • the openings for secondary air supply are equipped with air guide elements, the supply of this secondary air can be targeted, so that the burning operation, both in terms of the start-up operation as well as during continuous operation can be selectively influenced.
  • the air guiding elements are formed by tabs formed in the direction of the combustion chamber and integrally formed with the heat shield.
  • a heat shield can be manufactured in a simple manner, for example by using a V-shaped punching tool. can be formed, which are bent out of the plane of the heat shield after or with the punching operation.
  • the invention is also advantageously further developed in that the tabs are formed at different angles to the surface of the heat shield and / or to the radius of the heat shield. If the tabs extend almost perpendicular to the radius of the heat shield, a strong twist is introduced by the latter, while a lesser twist is introduced by tabs with a smaller angle to the radius. Tabs, which occupy a small angle to the surface of the heat shield, produce Heilströ ⁇ rules, which have a large radial component and a small axial component, while in tabs with large angles to the surface of the heat shield, the axial Kompo ⁇ nents dominated. In this way it is possible to direct secondary air with little swirl into the core region of the flame formation.
  • the air required for combustion is supplied; however, there is no excessive swirl which would adversely affect the stabilization of the flame.
  • a division of the secondary air can take place as a function of the orientation of the individual air guiding elements.
  • the tabs are formed in groups at substantially identical angles to the surface of the heat shield and / or to the radius of the heat shield.
  • the collective alignment of the straps results in defined flow states in the combustion chamber.
  • the invention is further useful in that the burner has a burnout zone and that the secondary air supplied to the burnout zone has a higher swirl than the secondary air supplied to the start zone.
  • a high twist is desired.
  • a radially inwardly swirled backflow region improves the burnout and ensures that the combustion chamber volume is well utilized.
  • the heat shield has an opening for the passage of an ignition element.
  • the burner nozzle has a fuel needle for supplying fuel into the burner and a primary air supply for supplying combustion air into the burner and that the outlet speed is selected by the choice of the inner diameter of the fuel needle of the fuel is predetermined so that during a starting phase of the burner fuel in a substantially undusted form reaches a starting zone.
  • the inner diameter of the fuel needle is between 0.5 and 0.7 mm.
  • the exit velocity at inner diameters between 0.5 and 0.7 mm can be almost doubled or even more than doubled ,
  • the inner diameter of the fuel needle is about 0.6 mm.
  • exit speeds of more than 0.6 m / s are possible in full-load operation, ie at a fuel mass flow of 0.5 kg / h, while at an inner diameter of 0.8 mm, the exit velocity is in the range of 0.35 m / s.
  • the exit speed increases during part-load operation, that is to say at a fuel mass flow of 0.2 kg / h from approximately 0.14 m / s to approximately 0.25 m / s.
  • the goal of a substantially non-atomized jet which reaches the starting zone when starting the heater, can also be achieved with a conventional fuel needle with an inner diameter of approximately 0.8 mm.
  • the starting zone is designed as a starting chamber into which an ignition element protrudes.
  • the wall of the combustion chamber can surround the ignition element in this way.
  • the "ballistic" fuel jet then the ignition element and wet the combustion chamber wall with fuel, so that the combustion chamber wall and adjacent components serve as wall evaporator after their heating.
  • the Brenn ⁇ chamber is substantially axially symmetrical, that in the combustion chamber, a baffle plate is arranged and that the baffle plate has a predetermined curvature in the axial direction. Due to the curvature of the baffle plate, there is a temperature-independent defined shaping of the baffle plate. In the case of newly formed baffle plates of the prior art, this is sometimes not the case since, depending on the temperature, spontaneous changes in shape can occur, which can adversely affect the combustion behavior of the burner.
  • the curvature is provided in the direction of the burnout zone. As a result, a sufficient space is provided in the region of the starting chamber. Furthermore, it has been found that the curvature in the direction of the burn-out zone does not adversely affect the flow behavior in this zone. In particular, the turbulent pronounced return flow region remains in the radially inner region of the burn-out zone.
  • the outer circumference of the baffle plate defines a plane and that the ratio between the maximum axial distance of the baffle plate from this plane and the diameter of the baffle plate is between 0.07 and 0.21.
  • the furthest bulging point of the baffle plate lies with respect to the radial coordinate, preferably substantially in the center of the arrangement. From the plane defined by the outer circumference of the baffle plate, this point has an axial distance defined by the specified ratio to the diameter.
  • the ratio between the maximum axial distance of the baffle plate from the plane and the diameter of the baffle plate is about 0.14.
  • the round diameter of the baffle plate is about 40 mm, while the bulge has a value of about 5.7 mm.
  • the invention is based on the finding that the operating behavior of a burner can be markedly improved by the novel heat shield with air guide elements, in particular in combination with the novel fuel feed and the novel baffle plate. This applies in particular to the starting behavior, the stability of the burner operation and the possibilities with regard to the installation position of the burner in the motor vehicle.
  • FIG. 1 is a sectional view of a burner according to the invention
  • FIG. 2 is a perspective view of a burner flange with a heat shield inserted therein;
  • Figure 3 is a perspective view of a heat shield.
  • FIG. 1 shows a sectional view of a burner according to the invention.
  • the burner 10 according to the invention has a nozzle 12 which is fixedly connected to a heat shield 24.
  • the heat shield 24, together with a burner tube 40 connected to the heat shield 24, defines a combustion chamber 22.
  • the combustion chamber tube 40 is surrounded by an outer tube 42, which forms the burner flange.
  • a flame tube 38 is attached.
  • the connections between the heat shield 24 and the combustion chamber tube 40 or between the combustion chamber tube 40, the outer tube 42 and the flame tube 38 are generally welded joints.
  • a fuel feed 50 is arranged, which has a metal tube 52 for supplying fuel and a fuel needle 14 for injecting fuel into the combustion chamber 22.
  • a baffle plate 36 is further arranged, which has an advantageous curvature. This curvature in the direction of the burn-out zone 32 is advantageous because it prevents heat-induced spontaneous changes in shape of the baffle plate 36. Due to the curvature of the baffle plate 36 in the direction of the Ausbrandzone 32 is also a sufficient space for the accommodation of the start chamber 18 is available.
  • the wall defining the start chamber 18 is welded to the baffle plate 36.
  • FIG. 2 shows a perspective view of a burner flange with a heat shield inserted therein
  • FIG. 3 shows a perspective view of a heat shield.
  • the heat shield 24 has a central opening 48, through which the fuel-air mixture discharged from the nozzle 12 enters the combustion chamber. Furthermore, a laterally arranged opening 34 for the passage of the ignition element 20 is provided. On the heat shield 24 fastening pins 44, 46 are further provided, on which the nozzle 12 is attached.
  • the heat shield 24 also has a plurality of openings 26 through which secondary air can enter the combustion chamber 22. On the combustion chamber 22 facing side of the Hit ⁇ zeschildes 24 triangular air guide elements 28, 30 are provided.
  • a first group of air guiding elements whose members are designated by the reference numeral 28 are aligned at a large angle to the radius of the heat shield 24, that is, their orientation is in the Essentially or almost tangentially.
  • the secondary air which passes through the corresponding openings 26 and whose outlet flow direction is indicated by an arrow, passes with high swirl past the impact disk 36 into the burn-out zone 32.
  • This air which is provided with a high swirl, flows radially outer region of the Ausbrandzone 32 in the rear region of the combustion chamber 22, that is in the heat shield 24 facing away from the combustion chamber 22, and then with great turbulence in the central region back towards the baffle plate 36.
  • Another group of air-guiding elements 30 has a smaller angle to the radius of the heat shield 24 in their orientation. These air guide elements are partially identified by the reference numeral 30. In addition, these air guide elements 30 have a smaller angle to the surface of the heat shield 24 than the air guide elements 28. Consequently secondary air, the outlet flow direction of which is indicated by a further arrow, is conducted into the core region of the flame by means of these air guide elements 30 , which in particular favors a sta ⁇ biles burning behavior.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spray-Type Burners (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un brûleur (10) destiné à un appareil de chauffage, utilisé notamment dans des véhicules automobiles, comprenant une buse (12) servant à l'acheminement de combustible et d'air primaire, une chambre de combustion (22) et un écran thermique (24) situé entre la buse et la chambre de combustion. Cet écran thermique présente des ouvertures (26) servant à l'acheminement d'air secondaire dans la chambre de combustion. Selon l'invention, les ouvertures sont équipées d'éléments de guidage d'air (28,30).
PCT/DE2005/002053 2004-11-17 2005-11-16 Bruleur pour un appareil de chauffage presentant un ecran thermique ameliore WO2006053537A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE112005003408T DE112005003408A5 (de) 2004-11-17 2005-11-16 Brenner für ein Heizgerät mit verbessertem Hitzeschild
EP05806923A EP1812749A1 (fr) 2004-11-17 2005-11-16 Bruleur pour un appareil de chauffage presentant un ecran thermique ameliore
US11/719,580 US20090220903A1 (en) 2004-11-17 2005-11-16 Burner for a heater with improved heat shield
CA002595016A CA2595016A1 (fr) 2004-11-17 2005-11-16 Bruleur pour un appareil de chauffage presentant un ecran thermique ameliore
JP2007541668A JP2008520947A (ja) 2004-11-17 2005-11-16 改良型遮熱板を備えたヒータ用バーナ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004055486.2 2004-11-17
DE102004055486 2004-11-17

Publications (1)

Publication Number Publication Date
WO2006053537A1 true WO2006053537A1 (fr) 2006-05-26

Family

ID=35985240

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2005/002053 WO2006053537A1 (fr) 2004-11-17 2005-11-16 Bruleur pour un appareil de chauffage presentant un ecran thermique ameliore

Country Status (9)

Country Link
US (1) US20090220903A1 (fr)
EP (1) EP1812749A1 (fr)
JP (1) JP2008520947A (fr)
KR (1) KR20070086041A (fr)
CN (1) CN101103227A (fr)
CA (1) CA2595016A1 (fr)
DE (1) DE112005003408A5 (fr)
RU (1) RU2359171C2 (fr)
WO (1) WO2006053537A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2601319A1 (fr) * 2004-11-17 2006-05-26 Webasto Ag Bruleur pour un appareil de chauffage, presentant une alimentation en combustible amelioree
US20160018131A1 (en) * 2013-03-15 2016-01-21 Mobile Air, Inc. Venturi disk non-exposed flame and electronic controls heater
CN109000226B (zh) * 2018-08-31 2023-12-29 北京天地融创科技股份有限公司 一种空冷燃烧器

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694135A (en) * 1970-07-20 1972-09-26 Texaco Inc Flame retention burner head
DE2250766A1 (de) * 1972-10-17 1974-04-18 Volkswagenwerk Ag Brenner, insbesondere fuer fahrzeuge
US4082495A (en) * 1976-02-17 1978-04-04 Denis Lefebvre Flame retention head assembly
US4096996A (en) * 1976-09-13 1978-06-27 Ketchum Jr Elmer Diffuser for fuel burners
GB2106632A (en) * 1981-09-11 1983-04-13 Secr Defence Fuel and gas mixing
WO1985000051A1 (fr) * 1983-06-14 1985-01-03 Sandstroem Christer Bruleur pour combustibles fossiles
GB2143938A (en) * 1983-07-23 1985-02-20 Rolls Royce Fuel burner for a gas turbine engine
US4561841A (en) * 1980-11-21 1985-12-31 Donald Korenyi Combustion apparatus
DE4323300A1 (de) * 1993-07-12 1995-01-19 Oertli Waermetechnik Ag Mischvorrichtung für einen Brenner
WO2001079755A1 (fr) * 2000-04-17 2001-10-25 Webasto Thermosysteme International Gmbh Bruleur atomiseur pour le dispositif de chauffage d'un vehicule

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994461A (en) * 1927-11-08 1935-03-19 Fuller Lehigh Co Fuel burner
US2758636A (en) * 1952-04-04 1956-08-14 American Air Filter Co Demountable burner
US2976919A (en) * 1956-05-29 1961-03-28 Bell & Gossett Co Oil burners
US2979901A (en) * 1958-09-02 1961-04-18 Curtis Automotive Devices Inc Pulse jet engine
US3081948A (en) * 1960-12-01 1963-03-19 Exxon Research Engineering Co Oil burner system
GB1165862A (en) * 1967-10-03 1969-10-01 Director Of Nat Aerospace Lab Air Swirling Vanes for Burner
SE329230B (fr) * 1968-04-18 1970-10-05 Bahco Ab
US3796209A (en) * 1971-12-21 1974-03-12 A Luft Space heater
US3905752A (en) * 1974-05-03 1975-09-16 Hy Way Heat Systems Inc Oil burner
US4651524A (en) * 1984-12-24 1987-03-24 Arvin Industries, Inc. Exhaust processor
DE3737247C1 (de) * 1987-11-03 1989-03-02 Zettner Michael L Brenneinrichtung
US5249535A (en) * 1992-03-25 1993-10-05 Landy Chung Low NOx burner
US5388536A (en) * 1992-03-25 1995-02-14 Chung; Landy Low NOx burner
US6036480A (en) * 1996-02-16 2000-03-14 Aos Holding Company Combustion burner for a water heater
US6368101B1 (en) * 2000-05-22 2002-04-09 Black Gold Corporation Flame retention head and nozzle block assembly for waste oil-burning systems

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694135A (en) * 1970-07-20 1972-09-26 Texaco Inc Flame retention burner head
DE2250766A1 (de) * 1972-10-17 1974-04-18 Volkswagenwerk Ag Brenner, insbesondere fuer fahrzeuge
US4082495A (en) * 1976-02-17 1978-04-04 Denis Lefebvre Flame retention head assembly
US4096996A (en) * 1976-09-13 1978-06-27 Ketchum Jr Elmer Diffuser for fuel burners
US4561841A (en) * 1980-11-21 1985-12-31 Donald Korenyi Combustion apparatus
GB2106632A (en) * 1981-09-11 1983-04-13 Secr Defence Fuel and gas mixing
WO1985000051A1 (fr) * 1983-06-14 1985-01-03 Sandstroem Christer Bruleur pour combustibles fossiles
GB2143938A (en) * 1983-07-23 1985-02-20 Rolls Royce Fuel burner for a gas turbine engine
DE4323300A1 (de) * 1993-07-12 1995-01-19 Oertli Waermetechnik Ag Mischvorrichtung für einen Brenner
WO2001079755A1 (fr) * 2000-04-17 2001-10-25 Webasto Thermosysteme International Gmbh Bruleur atomiseur pour le dispositif de chauffage d'un vehicule

Also Published As

Publication number Publication date
DE112005003408A5 (de) 2007-10-25
KR20070086041A (ko) 2007-08-27
CN101103227A (zh) 2008-01-09
RU2007122478A (ru) 2008-12-27
US20090220903A1 (en) 2009-09-03
JP2008520947A (ja) 2008-06-19
EP1812749A1 (fr) 2007-08-01
RU2359171C2 (ru) 2009-06-20
CA2595016A1 (fr) 2006-05-26

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