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 substantially axially symmetrical combustion chamber and a baffle plate arranged in 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.
• 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-noise starting behavior with different mounting positions.
• the invention is based on the generic burner in that the baffle plate has a predetermined curvature in the axial direction and that the curvature is provided in the direction of the burn-out zone. 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 burning behavior of the burner. Due to the curvature in the direction of the burn-out zone, sufficient space is provided in the region of the start chamber. Furthermore, it has been found that the curvature in the direction of the fire zone does not negatively influence the flow behavior in this zone. In particular, the turbulent embossed backflow region remains in the radially inner region of the burnout zone.
• the outer periphery of the baffle plate is an Ebe ne 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 most bulged point of the baffle plate is preferably substantially at the center of the assembly with respect to the radial coordinate. 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 disc 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.
• a burner nozzle is provided for supplying fuel and primary air
• a heat shield is provided between the burner nozzle and the combustion chamber, the heat shield having openings for supplying secondary air into the burner Combustion chamber, and that the openings are equipped with air guide elements.
• a Hit ⁇ zeschild is basically useful to shield the nozzle and the fuel feeder against the heat energy in the combustion chamber vorlie ⁇ ing.
• Secondary air is fed into the combustion chamber via the heat shield.
• 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 forming holes with a V-shaped punching tool, which are bent out of the plane of the heat shield after or with the punching operation.
• the invention is also usefully further developed in that the tabs are formed at different angles to the surface of the heat shield and / or 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 low 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 fed to the start zone.
• the burner has a burnout zone and that the secondary air supplied to the burnout zone has a higher swirl than the secondary air fed to the start zone.
• the Ausbrandzone a high twist is desired.
• a radially inward swirled backflow region improves 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 start zone when the heater starts, may also be with a conventional fuel needle with an réelle emb ⁇ diameter of about 0.8 mm can be achieved.
• 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 can then wet the ignition element and the combustion chamber wall so that the combustion chamber wall and adjacent components serve as wall evaporators after their heating.
• the invention is based on the finding that the operating behavior of a burner can be markedly improved by the novel curved baffle plate, in particular in combination with the novel fuel feed and the novel heat shield. This relates 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 shows 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; and 3 shows 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 heat shield 24 and combustion chamber tube 40 or between combustion chamber tube 40, outer tube 42 and 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 having. This curvature in the direction of the burn-out zone 32 is advantageous because heat-induced spontaneous changes in form of the baffle plate 36 are thereby prevented. 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 partially denoted by the reference numeral 28, are aligned at a large angle to the radius of the heat shield 24, that is, their orientation is substantially or almost tangentially. Because of this Aus ⁇ direction through the corresponding openings 26th passing secondary air, the outlet flow Rich ⁇ indicated by an arrow, with high swirl on the baffle plate 36 over in the Ausbrandzone 32 überre ⁇ th.
• a novel spray burner is made available, which is improved with regard to the possible installation positions, the starting behavior and the behavior in continuous operation. Furthermore, problems with regard to temperature-induced changes in shape of the baffle plate are avoided.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Spray-Type Burners (AREA)
• Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
• Gas Burners (AREA)
• Nozzles For Spraying Of Liquid Fuel (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=35976457

Family Applications (1)

Country Status (9)

Families Citing this family (4)

Family Cites Families (15)

• 2005
  • 2005-11-16 DE DE112005003409T patent/DE112005003409A5/de not_active Withdrawn
  • 2005-11-16 CN CNA2005800467056A patent/CN101103228A/zh active Pending
  • 2005-11-16 JP JP2007541669A patent/JP2008520948A/ja active Pending
  • 2005-11-16 EP EP05814236A patent/EP1812750A1/de not_active Withdrawn
  • 2005-11-16 RU RU2007122477/06A patent/RU2361147C2/ru not_active IP Right Cessation
  • 2005-11-16 CA CA002595021A patent/CA2595021A1/en not_active Abandoned
  • 2005-11-16 WO PCT/DE2005/002059 patent/WO2006053540A1/de active Application Filing
  • 2005-11-16 US US11/719,578 patent/US20090220902A1/en not_active Abandoned
  • 2005-11-16 KR KR1020077013154A patent/KR20070086042A/ko not_active Application Discontinuation

Non-Patent Citations (1)

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