EP3006718A1 - Vorrichtung zum atomisieren von flüssigkeiten - Google Patents

Vorrichtung zum atomisieren von flüssigkeiten Download PDF

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Publication number
EP3006718A1
EP3006718A1 EP15188632.2A EP15188632A EP3006718A1 EP 3006718 A1 EP3006718 A1 EP 3006718A1 EP 15188632 A EP15188632 A EP 15188632A EP 3006718 A1 EP3006718 A1 EP 3006718A1
Authority
EP
European Patent Office
Prior art keywords
needle
spray orifice
liquid
free end
excitation means
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
EP15188632.2A
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English (en)
French (fr)
Other versions
EP3006718B1 (de
Inventor
Laurent Levin
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.)
Renault SAS
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Renault SAS
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Publication date
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Publication of EP3006718A1 publication Critical patent/EP3006718A1/de
Application granted granted Critical
Publication of EP3006718B1 publication Critical patent/EP3006718B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/041—Injectors peculiar thereto having vibrating means for atomizing the fuel, e.g. with sonic or ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the present invention generally relates to the atomization of a liquid, that is to say the reduction of a liquid into a jet of fine droplets.
  • the invention finds a particularly advantageous application in the production of fuel injectors or foggers.
  • An " indirect injection” internal combustion engine is a heat engine in which the fuel injection is not done in the cylinders of the engine block, but upstream of them, in the inlet ducts of the engine block. air in the cylinders.
  • This type of engine is particularly used in electric vehicles equipped with heat engines having a simple function of range extender (better known by the term " range extender ").
  • the heat engine is coupled to an alternator that charges the main storage battery of the vehicle when the charge level of this battery is too low.
  • the motor is then always used at a quasi-stationary regime, in which its performance is optimal.
  • a fogger To manufacture a fogger, it is known to use a nozzle in which the water reaches a moderate pressure and which has at its end a membrane pierced with a plurality of orifices of small diameters. The membrane is then excited at an ultrasonic frequency so as to inject the water in the form of a cloud of fine droplets.
  • the present invention proposes a new atomization device, which can be used both in the form of a fuel injector and in the form of a misting device, and which does not have the aforementioned drawbacks of the state of the technical.
  • an atomization device as defined in the introduction, wherein said needle has an inner pipe which opens on its free end, and there is provided a gas inlet which communicates with said pipe interior.
  • the reciprocating movement (at a generally ultrasonic frequency) of the needle makes it possible to chop the jet of liquid so that this liquid is sprayed through the spray orifice under form of droplets. It is said that the liquid is nebulized. This step does not require strongly compressing the liquid upstream of the device, since the spray orifice used may have a large diameter.
  • the jet of nebulized liquid meets the jet of gas, which makes it possible to disperse the jet of nebulized liquid in the desired direction, at the desired speed. Fine droplets of liquid are said to be atomized.
  • FIG. 1 On the figure 1 , there is shown a device 1 for atomizing liquid.
  • This atomizing device 1 may be used to provide a misting function, in which case this liquid will be water.
  • This atomizing device 1 may also be used to provide a fuel injector function, in which case this liquid will be fuel.
  • this atomizing device 1 mainly comprises a sheath (hereinafter called nozzle 2), a needle 10 mounted in the nozzle 2, means 20 for exciting the needle 10 and a liquid inlet 30.
  • the nozzle 2 has a bore 5 which opens at one end through a spray orifice 4. It is through this spray orifice 4 that the liquid will be ejected.
  • This end of the nozzle 2 will be called the front end. More generally, in the description, the terms “front” and “back” will be used with respect to the direction of ejection of the liquid, the front of an element designating the side of this element which is turned in the direction ejection and the rear designating the side of this element that is turned away.
  • the needle 10 and the nozzle 2 have such shapes that they define, around the free end 11 before the needle 10, a cavity 31 which communicates with the liquid inlet 30 and which therefore forms a reservoir of liquid.
  • the excitation means 20 are then provided to vibrate the needle 10 between its closed and open positions, so that the liquid contained in the cavity 31 can be regularly ejected from the atomizing device 1 through the Spray orifice 4.
  • the atomizing device 1 comprises a gas inlet 40 which communicates with an inner pipe 12 which passes through the needle 10 and which opens out on the free end 11 before the needle 10.
  • the gases arriving in the atomizing device 1 by the gas inlet 40 are then provided to rush into the inner pipe 12 in order to lead through the spray orifice 4.
  • these gases will divert the liquid particles ejected through the spray orifice 4, in the direction and at the desired speed.
  • the gas used will generally be compressed air.
  • the nozzle 2 has an outer cylindrical shape of revolution about a longitudinal axis A1.
  • Its bore 5 has a central portion 9 of cylindrical shape of revolution about the longitudinal axis A1.
  • the bore 5 On the side of the front end of the nozzle 2, the bore 5 has a front portion 6 whose section is gradually reduced to the spray orifice 4, so that the spray orifice 4 has a smaller diameter to that of the central portion 9 of the bore 5.
  • This front portion 6 has a frustoconical shape of revolution about the longitudinal axis A1. Its function is to provide a support abutment for the free end before 11 of the needle 10. It will henceforth be called seat 6.
  • the bore 5 On the side of the rear end of the nozzle 2, the bore 5 has a section enlargement 7 whose inner face is cylindrical in revolution about the longitudinal axis A1.
  • a ring 8 is mounted in force in this enlargement of section 7, which ensures its immobilization.
  • This ring 8 delimits a cylindrical inner duct of revolution about the longitudinal axis A1, through which is threaded the needle 10, of internal diameter equal to the diameter of the spray orifice 4.
  • the needle 10 is housed inside the bore 5 of the nozzle 2.
  • a central portion 13 is cylindrical of revolution about the longitudinal axis A1.
  • This central portion 13 of the needle 10 is extended at the rear by a frustoconical portion 15 whose section is gradually reduced, then by a cylindrical end portion 14 of revolution about the longitudinal axis A1.
  • the end portion 14 and the central portion 13 of the needle 10 respectively have a diameter equal to the operating clearance, to the inner diameter of the ring 8 and the central portion 9 of the bore 5, which ensures the sliding without play of the needle 10 in the nozzle 2.
  • the free end 11 before the needle 10 has a frustoconical shape of revolution about the longitudinal axis A1, which substantially matches the shape of the seat 6.
  • the needle 10 finally has, between its free end before 11 and its central portion 13, a hook which delimits with the bore 5 of the nozzle 2 the cavity 31 of liquid.
  • the frustoconical portion 15 of the needle 10 defines with the bore 5 a second cavity 32 which contains liquid.
  • This second cavity 32 communicates with the first cavity 31, for example via grooves provided in the outer face of the central portion 13 of the needle 10.
  • the liquid inlet 30 comprises a connection 33 which is fixed on the outer face of the nozzle 2 and which communicates with the second cavity 32 via a duct 34 which passes through the lateral wall of the nozzle 2.
  • the atomizing device 1 comprises a rear cover 3 which is fixed to the rear of the nozzle 2 and which delimits therewith a chamber 41 in which these excitation means 20 are housed.
  • this rear cover 3 has a tube shape open at a front end and closed at a rear end. It is fitted by its front end open on the nozzle 2, so as to be attached thereto in a sealed manner.
  • the excitation means 20 housed in the chamber 41 are then provided to axially vibrate the needle 10 at an ultrasonic frequency.
  • these excitation means 20 comprise for this purpose a support 21 and a piezoelectric transducer 22.
  • the support 21 has a central shaft 24 which is cylindrical of revolution about the longitudinal axis A1 and which is bordered at mid-length by a disc 25 in the form of flat disk and thin.
  • the piezoelectric transducer 22 is fixed to this ring 25, here on the rear face thereof. It presents for this purpose a flattened ring shape.
  • This piezoelectric transducer 22 is intended to be electrically controlled, between an inactive state in which it is not deformed, and an active state in which it periodically deforms at an ultrasonic frequency.
  • this piezoelectric transducer 22 makes it possible to bend the ring 25 periodically forwards and backwards, so that the excitation means 20 move back and forth along the axis longitudinal A1.
  • the front end of the central shaft 24 of the support 21 has a threaded bore 26 in which is screwed a threaded portion provided at the rear end of the needle 10.
  • return means 50 which automatically remind the needle 10 in the closed position when the excitation means 20 are inactive.
  • these return means are mechanical and are more precisely formed by a compression spring 50 which is interposed between the rear end of the central shaft 24 of the support 21 and the bottom of the rear cover 3.
  • the air inlet 40 has a connector 43 which is fixed through the side wall of the rear cover 3 and which thus communicates with the chamber 41.
  • the inner pipe 12, provided in the needle 10, here passes axially through the needle 10 along the longitudinal axis A1.
  • the central shaft 24 of the support 21 is also traversed axially by an inner pipe 23 which extends in the extension of the inner pipe 12 of the needle 10.
  • regulating means 42 for the flow of gas flowing through these inner conduits 12, 23.
  • These regulating means are here formed by a valve 42 placed on the coupling 43.
  • It may be a simple bistable valve 42, controlled between an open state in which the air flows in the atomizing device 1, and a closed state in which the air passage is blocked. This valve 42 can then be driven in the open state as soon as the excitation means 20 are activated.
  • a valve may be used to regulate the air flow more precisely.
  • the atomizing device 1 is shown in the open state.
  • the needle 10 which is in the open position is therefore located at a distance from its seat 6, which makes it possible to eject liquid through the spray orifice 4.
  • the atomizing device 1 is shown in the closed state.
  • the needle 10 which is in the closed position, is located against its seat 6, which makes it possible to block the ejection of liquid through the spray orifice 4.
  • a control unit applies electrical excitation to the piezoelectric transducer 22, which deforms and generates a movement of the needle 10 in a back and forth motion.
  • This back and forth is operated at a resonant frequency which will place the needle 10 and the support 21 in ultrasound levitation relative to the seat 6.
  • This displacement generates an alternation of openings and closures of the spray orifice 4 with ultrasonic frequency, which makes it possible to chop the jet of liquid and thus to nebulize the liquid as it leaves it through the spray orifice 4.
  • the drops of liquid which tend to converge are spaced apart so as to diverge at a desired speed and according to a desired dispersion cone (adjustable by modifying the air flow).
  • the inner pipe of the needle is bent, and opens not on the rear end of the needle but on the side thereof.
  • the excitation means are not piezoelectric but electromagnetic.
  • this atomization device could thus be used to manufacture a spray gun or a device for spreading and treating crops.
EP15188632.2A 2014-10-06 2015-10-06 Vorrichtung zum atomisieren von flüssigkeiten Active EP3006718B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1459571A FR3026662B1 (fr) 2014-10-06 2014-10-06 Dispositif d’atomisation de liquide

Publications (2)

Publication Number Publication Date
EP3006718A1 true EP3006718A1 (de) 2016-04-13
EP3006718B1 EP3006718B1 (de) 2018-02-21

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EP15188632.2A Active EP3006718B1 (de) 2014-10-06 2015-10-06 Vorrichtung zum atomisieren von flüssigkeiten

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EP (1) EP3006718B1 (de)
FR (1) FR3026662B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016206902A1 (de) * 2016-04-22 2017-10-26 Technische Universität Bergakademie Freiberg Vorrichtung zur Modulation mindestens eines Flüssigkeitsstrahls

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE787603A (fr) * 1972-08-16 1973-02-16 Cottell Eric Ch Procede et appareil pour former un melange de carburant et d'air au moyen d'energie sonique.
JPS63270573A (ja) * 1987-04-30 1988-11-08 Toa Nenryo Kogyo Kk 超音波・超音速気流複合噴射弁
JPS6438160A (en) * 1987-08-05 1989-02-08 Toa Nenryo Kogyo Kk Ultrasonic composite atomizer
JPH02259264A (ja) * 1989-03-31 1990-10-22 Tonen Corp ガソリンエンジン用超音波霧化装置付燃料供給装置
JPH0412158A (ja) * 1990-04-28 1992-01-16 Tonen Corp 火花点火エンジンの燃料供給装置
WO2008000095A1 (en) * 2006-06-29 2008-01-03 The University Of British Columbia Concurrent injection of liquid and gaseous fuels in an engine
EP2060774A1 (de) * 2007-11-16 2009-05-20 Delphi Technologies, Inc. Kraftstoffeinspritzdüse

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE787603A (fr) * 1972-08-16 1973-02-16 Cottell Eric Ch Procede et appareil pour former un melange de carburant et d'air au moyen d'energie sonique.
JPS63270573A (ja) * 1987-04-30 1988-11-08 Toa Nenryo Kogyo Kk 超音波・超音速気流複合噴射弁
JPS6438160A (en) * 1987-08-05 1989-02-08 Toa Nenryo Kogyo Kk Ultrasonic composite atomizer
JPH02259264A (ja) * 1989-03-31 1990-10-22 Tonen Corp ガソリンエンジン用超音波霧化装置付燃料供給装置
JPH0412158A (ja) * 1990-04-28 1992-01-16 Tonen Corp 火花点火エンジンの燃料供給装置
WO2008000095A1 (en) * 2006-06-29 2008-01-03 The University Of British Columbia Concurrent injection of liquid and gaseous fuels in an engine
EP2060774A1 (de) * 2007-11-16 2009-05-20 Delphi Technologies, Inc. Kraftstoffeinspritzdüse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016206902A1 (de) * 2016-04-22 2017-10-26 Technische Universität Bergakademie Freiberg Vorrichtung zur Modulation mindestens eines Flüssigkeitsstrahls

Also Published As

Publication number Publication date
EP3006718B1 (de) 2018-02-21
FR3026662B1 (fr) 2018-04-13
FR3026662A1 (fr) 2016-04-08

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