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EP0782885A1 - Sprühvorrichtung mit erhöhtem Wikungsgrad, insbesondere zur Erzeugung von Mikrotröpfchen von Wasser - Google Patents

Sprühvorrichtung mit erhöhtem Wikungsgrad, insbesondere zur Erzeugung von Mikrotröpfchen von Wasser Download PDF

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Publication number
EP0782885A1
EP0782885A1 EP97400008A EP97400008A EP0782885A1 EP 0782885 A1 EP0782885 A1 EP 0782885A1 EP 97400008 A EP97400008 A EP 97400008A EP 97400008 A EP97400008 A EP 97400008A EP 0782885 A1 EP0782885 A1 EP 0782885A1
Authority
EP
European Patent Office
Prior art keywords
tank
liquid
opening
waves
water
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
EP97400008A
Other languages
English (en)
French (fr)
Other versions
EP0782885B1 (de
Inventor
Georges Fonzes
Gil Ching
Michel Gschwind
Daniel Guyomar
Jean Lauretti
Jean-Denis Sauzade
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.)
IMRA Europe SAS
Original Assignee
IMRA Europe SAS
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 IMRA Europe SAS filed Critical IMRA Europe SAS
Publication of EP0782885A1 publication Critical patent/EP0782885A1/de
Application granted granted Critical
Publication of EP0782885B1 publication Critical patent/EP0782885B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/24—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means incorporating means for heating the liquid or other fluent material, e.g. electrically
    • 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
    • B05B17/0615—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 spray being produced at the free surface of the liquid or other fluent material in a container and subjected to the vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/0012—Apparatus for achieving spraying before discharge from the apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/48—Sonic vibrators

Definitions

  • the present invention relates to a high efficiency spray device, in particular water in the form of micro-droplets.
  • Such devices comprising a piezoelectric ceramic transducer excited by a high frequency electrical signal which emits ultrasonic waves in a small tank filled with water.
  • the waves propagate in the water in a nonlinear way and there is an accumulation of static pressure towards the surface of the water, from where the appearance of a jet of liquid called "acoustic fountain", which is surrounded by a mist of micro-droplets.
  • An air current created in the vicinity of the water jet then evacuates the micro-droplets to the outside of the device, into the ambient air.
  • the energy supplied by the transducer is used only partially to generate the microdroplets because the face of the transducer which is not in contact with water emits waves which are absorbed by the support of the transducer and also in the tank by multi-reflection and are lost.
  • the present invention aims to provide a spraying device which has a high yield, in particular eliminating the above-mentioned problem.
  • the present invention relates to a device for spraying liquid, comprising a first elongated tank closed at one of its ends by a first free face of a piezoelectric transducer capable of emitting waves in a liquid filling the tank and open to its end opposite to the piezoelectric transducer, characterized in that the piezoelectric transducer has a second free face, opposite to its first free face, and that a second elongated tank is disposed, relative to the piezoelectric transducer, symmetrically with the first tank, the second tank being closed at one of its ends by said second free face of the piezoelectric transducer, which is thus able to also emit waves in a liquid filling the second tank, this second tank being open at its end opposite the piezoelectric transducer.
  • the device according to the invention has a high yield since it makes it possible to generate a lot more droplets than if it had only one tank.
  • the two tanks are able to be completely filled with liquid.
  • the waves emitted by the piezoelectric transducer in each tank are concentrated in the vicinity of the opening of each tank, the cross section of each tank having a gradual narrowing in the direction of the opening of the tank.
  • the part of each tank having a narrowing of section has a shape of paraboloid of revolution whose focal point is located in the vicinity of the corresponding opening.
  • the liquid contained in each tank is not very sensitive to the accelerations of the medium in which the device according to the invention is installed.
  • the device according to the invention can be installed in an automobile, a boat or an airplane.
  • each tank are made of a hard material, capable of reflecting waves, and are shaped so as to concentrate the waves in the vicinity of the central part of the opening of the tank.
  • each tank fulfills at least two distinct functions, namely a limitation of the risk of liquid overflowing outside the tank on the one hand, and a concentration of waves in the vicinity of the central part of the opening of the tank on the other hand.
  • each tank comprises, in the vicinity of its opening, heating means, for example electrical resistances, making it possible to raise the temperature of the liquid just before it is sprayed.
  • heating means for example electrical resistances
  • part of the acoustic energy supplied by the waves is converted into heat, preferably in the vicinity only of the opening of each tank, otherwise in the entire wall of each tank, thanks to the presence of an acoustically absorbent material such as a polymer.
  • the polymer may be found only in the vicinity of the opening of the tank, or may constitute the whole of the tank, in which case the reflection of the waves may be less good but sufficient to obtain the concentration of the waves in the vicinity of the opening, while the view walls heat all of the liquid in it.
  • the device according to the invention is provided with ventilation means to create an air circulation in the vicinity of the surface of the liquid contained in each tank.
  • the device comprises a collection container in which the tanks are placed, a pump being connected on the one hand to the collection container, on the other hand to each tank, and being capable of permanently circulate the liquid between each tank from which it overflows and the collection container where it is collected, a liquid reservoir, also connected to the pump, making it possible to keep constant the quantity of liquid circulating in the device by compensating for the consumption of liquid necessary for the production of droplets.
  • the instability of the liquid level at the opening of each tank which could result from unforeseeable overflows due to strong accelerations undergone by the device, is for the most part compensated by the fact that, the liquid constantly and forcibly overflowing at the opening of each tank, even strong accelerations can only cause a slight fluctuation in the quantity of liquid overflowing, without appreciably modifying the level of the liquid at the opening of each tank.
  • the flow rate of the pump is high enough to generate a jet of liquid at the opening of each tank, independently of the acoustic fountain which results from the sole action of ultrasonic waves.
  • the energy of the waves can be mobilized mainly for spraying the liquid, the formation of acoustic fountains being facilitated by the fact that the liquid jets are already created by the pump.
  • the diameter of the opening of each tank close to that of the acoustic fountain which would be naturally formed by waves in the absence of pump, so as to best superimpose the water jet formed by the pump and the acoustic fountain generated by the waves.
  • a deflector is provided in the extension of the opening of each tank, to retain the large drops of liquid which are thus recovered in the collection container, while the air flow generated by the means ventilation system evacuates micro-droplets to the outside of the device.
  • the device shown in the drawing comprises two elongated tanks 1 a, 1 b, revolution which each comprise a base cylindrical 2 a , 2 b and an upper part 3 a , 3 b whose section narrows in the direction of an opening 4 a , 4 b .
  • Each opening may be circular, as shown in Figure 2 or scalloped as shown in Figure 3, or even provided with a central waveguide which closes its central part and leaves only an annular passage free, as shown in Figure 4.
  • Each tank 1 a , 1 b is intended to be completely filled with water.
  • a piezoelectric transducer 5 constituted by a disc-shaped ceramic is placed between the two tanks 1 a , 1 b , opposite their respective openings 4 a , 4 b .
  • the transducer 5 which has two opposite free faces 5 a , 5 b each constituting the bottom of a tank 1 a , 1 b , is capable of emitting ultrasonic waves in the water contained in each tank, in the direction of the corresponding opening 4 a , 4 b .
  • each tank is made, for example, of stainless steel which is a material hard enough to reflect waves by absorbing minimal energy.
  • the converging shape of the walls of each tank is determined so as to concentrate the waves in the central part of the corresponding opening.
  • the tanks 1 a , 1 b are housed inside a closed container 6 which constitutes a collection container within the meaning of the invention.
  • a fan 7 driven by a motor not shown.
  • a water tank 8 in which is housed a pump 9 connected on the one hand to each tank 1 a , 1 b via a first conduit 10, d on the other hand to the collection container 6 by means of a second conduit 11, two openings 41 a , 41 b of which open opposite the open ends of each tank and two other openings 41 c of which open in the vicinity of the transducer 5.
  • the fan 7 is housed in a common compartment 12 of the collection container 6.
  • This compartment 12 is delimited by an external wall 13 of the collection container 6 and by a sealed internal partition 14 which leaves two passages 15 free to compartments 16 a and 16 b each containing a tank.
  • each compartment 16 a , 16 b An air current is thus created in each compartment 16 a , 16 b , between several deflectors 17 which convey the air to an opening 18 a , 18 b from which the air and the water droplets escape. formed above the openings of each tank, as indicated by the arrows 19.
  • each tank 1 a , 1 b is enclosed in a spherical cap-shaped deflector 20 a , 20 b with an axis substantially perpendicular to the longitudinal axis of each tank, and whose concavity is opposite to the direction displacement of the air stream.
  • Each cap 20 a, 20 b is secured to the outer wall of the vessel 1 as a seal 21a, 21b.
  • electrical resistors 22 are provided which are inserted into the thickness of the wall of each tank and allow the water to be heated before being sprayed.
  • the heating power is calculated so as to heat only the periphery of the jet to limit the electrical power required.
  • Heating can also be obtained by taking part of the acoustic waves to heat the end of the tank, for example with a polymeric material which heats up by absorbing the waves.
  • this sandwich material is placed between two metal walls to protect it from direct attack by waves.
  • Figure 5 there is shown the part having a narrowing of section of a metal tank 1 b which has a thickness of a polymer 25 in a recess made on its inner face, in the vicinity of its opening 4 b .
  • the polymer is covered with a thin metallic layer 24 of a few hundred micrometers which is intended to protect said polymer from direct attack by waves.
  • the waves are partially absorbed by the polymer which heats up and thus raises the temperature of the water.
  • This heating by acting on the surface tension of the water and on its saturated vapor pressure, creates a compromise on its parameters favorable to spraying and further increases the yield of the device.
  • the orientation of the device is vertical, as shown in FIG. 1.
  • Each tank is filled with water.
  • the pump 9 discharges water through the conduit 10, so that a first jet of water gushes at the opening of the tank 1b and a second jet of water flows at the opening from tank 1 a .
  • water jets of circular section are obtained, in the form of a daisy or a ring.
  • the shape of the openings 4 a and 4 b is not limited to those shown in the drawing.
  • the water is recovered by the collection container 6 and recirculated by the pump 9, via the conduit 11.
  • the ceramic 5 emits waves in the two tanks, waves which progress in the water along planes perpendicular to the longitudinal axis of the tank.
  • each tank 1 a , 1 b concentrates the waves substantially in the central part of the corresponding opening 2 2 a , 2 b .
  • This concentration of wave energy in the vicinity of the water surface propagates inside the jet, which allows the formation of a mist of micro-droplets surrounding each jet of water.
  • micro-droplets in a preferred mode, have a diameter of less than 5 micrometers. They are carried outwards by the air current created by the fan 7.
  • the diameter of the openings 4 a , 4 b is chosen so that the waves are concentrated in the vicinity of the opening in each tank.
  • the energy of the waves which is not used to form the acoustic fountains, is mainly used to spray the water.
  • the spraying efficiency is increased because on the one hand the wave energy is used mainly for spraying water, the water jets being already formed by the pump, on the other hand, the use of a jet assisted by an external pump allows a better adjustment of the operating parameters of the device, which makes it possible to achieve an optimal operation in which the jet exceeds in length the jet which would be created by the sole sound pressure due to waves.
  • the spray surface is further increased from which the water droplets can form.
  • the two faces 5 a and 5 b of the transducer 5 are used for spraying, which makes it possible to significantly increase the production of water droplets compared to a device which would comprise only one tank.
  • the water tank 8 allows the pump 9 to keep the amount of water circulating in the device constant, by compensating for the volume of water discharged to the outside by micro-spraying.
  • this device whose overall dimensions are of the order of 4 cm in diameter and 10 cm long, can be easily installed in a vehicle.
  • the device according to the invention can be installed in the passenger compartment of an automobile with its longitudinal axis inclined by 10 degrees relative to the horizontal, which gives it bulk. vertical of approximately 5.7 cm which allows it to be housed in the passenger compartment ceiling, for example.
  • the device according to the invention can also be carried on an airplane or on a boat where the conditions of stability are, a priori, not very good.
  • the water jet leaving the lower opening is straight and extends to the bottom of the lower compartment. Therefore, the humidification volume is increased since the surface of the water jet is increased.

Landscapes

  • Special Spraying Apparatus (AREA)
  • Nozzles (AREA)
EP97400008A 1996-01-04 1997-01-03 Sprühvorrichtung mit erhöhtem Wikungsgrad, insbesondere zur Erzeugung von Mikrotröpfchen von Wasser Expired - Lifetime EP0782885B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9600048A FR2743313B1 (fr) 1996-01-04 1996-01-04 Dispositif de pulverisation a rendement eleve notamment d'eau sous forme de micro-gouttelettes
FR9600048 1996-01-04

Publications (2)

Publication Number Publication Date
EP0782885A1 true EP0782885A1 (de) 1997-07-09
EP0782885B1 EP0782885B1 (de) 2001-10-24

Family

ID=9487892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400008A Expired - Lifetime EP0782885B1 (de) 1996-01-04 1997-01-03 Sprühvorrichtung mit erhöhtem Wikungsgrad, insbesondere zur Erzeugung von Mikrotröpfchen von Wasser

Country Status (5)

Country Link
US (1) US5836515A (de)
EP (1) EP0782885B1 (de)
JP (1) JPH09192555A (de)
DE (1) DE69707511T2 (de)
FR (1) FR2743313B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016087752A1 (fr) 2014-12-05 2016-06-09 Areco Finances Et Technologie - Arfitec Dispositif de pulvérisation compact
WO2017103548A1 (fr) * 2015-12-17 2017-06-22 Areco Finances Et Technologie - Arfitec Dispositif de pulvérisation a transducteur piézoélectrique, notamment pour véhicule
DE202018001634U1 (de) 2017-03-28 2018-06-29 Areco Finances Et Technologie - Arfitec Kompakte Zerstäubungsvorrichtung, und Zerstäubungsanordnung, die eine solche Vorrichtung umfasst
WO2019048761A1 (fr) 2017-09-11 2019-03-14 Areco Finances Et Technologie - Arfitec Dispositif de generation de gouttelettes a partir d'un liquide comprenant des moyens ameliores de diffusion du brouillard, et son procede de mise en œuvre
WO2019048763A1 (fr) 2017-09-11 2019-03-14 Areco Finances Et Technologie - Arfitec Dispositif de generation de gouttelettes a partir d'un liquide comprenant des moyens de ventilation ameliores, et son procede de mise en œuvre
CN113390151A (zh) * 2021-05-13 2021-09-14 范海良 一种带有超声波定向加湿功能的空气净化器

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016087752A1 (fr) 2014-12-05 2016-06-09 Areco Finances Et Technologie - Arfitec Dispositif de pulvérisation compact
WO2017103548A1 (fr) * 2015-12-17 2017-06-22 Areco Finances Et Technologie - Arfitec Dispositif de pulvérisation a transducteur piézoélectrique, notamment pour véhicule
FR3045420A1 (fr) * 2015-12-17 2017-06-23 Areco Finances Et Tech - Arfitec Dispositif de pulverisation a transducteur piezoelectrique, notamment pour vehicule
DE202018006305U1 (de) 2017-03-28 2019-12-16 Areco Finances Et Technologie - Arfitec Kompakte Zerstäubungsvorrichtung und Zerstäubungsanordnung, die eine solche Vorrichtung umfasst
DE202018001632U1 (de) 2017-03-28 2018-06-29 Areco Finances Et Technologie - Arfitec Kompakte Zerstäubungsvorrichtung, und Zerstäubungsanordnung, die eine solche Vorrichtung umfasst
DE202018001633U1 (de) 2017-03-28 2018-07-02 Areco Finances Et Technologie - Arfitec Kompakte Zerstäubungsvorrichtung, und Zerstäubungsanordnung, die eine solche Vorrichtung umfasst
WO2018178539A1 (fr) 2017-03-28 2018-10-04 Areco Finances Et Technologie - Arfitec Dispositif de nebulisation compact, et ensemble de nebulisation comprenant un tel dispositif
FR3064503A1 (fr) * 2017-03-28 2018-10-05 Areco Finances Et Technologie - Arfitec Dispositif de nebulisation compact, et ensemble de nebulisation comprenant un tel dispositif
DE202018006306U1 (de) 2017-03-28 2019-12-16 Areco Finances Et Technologie - Arfitec Kompakte Zerstäubungsvorrichtung und Zerstäubungsanordnung, die eine solche Vorrichtung umfasst
DE202018006308U1 (de) 2017-03-28 2019-12-16 Areco Finances Et Technologie - Arfitec Kompakte Zerstäubungsvorrichtung und Zerstäubungsanordnung, die eine solche Vorrichtung umfasst
DE202018001634U1 (de) 2017-03-28 2018-06-29 Areco Finances Et Technologie - Arfitec Kompakte Zerstäubungsvorrichtung, und Zerstäubungsanordnung, die eine solche Vorrichtung umfasst
EP4292480A2 (de) 2017-03-28 2023-12-20 Areco Finances Et Technologie - Arfitec Kompakte vernebelungsvorrichtung sowie vernebelungssystem mti einer solchen vernebelungsvorrichtung
EP4292480A3 (de) * 2017-03-28 2024-03-20 Areco Finances Et Technologie - Arfitec Kompakte vernebelungsvorrichtung sowie vernebelungssystem mti einer solchen vernebelungsvorrichtung
WO2019048761A1 (fr) 2017-09-11 2019-03-14 Areco Finances Et Technologie - Arfitec Dispositif de generation de gouttelettes a partir d'un liquide comprenant des moyens ameliores de diffusion du brouillard, et son procede de mise en œuvre
WO2019048763A1 (fr) 2017-09-11 2019-03-14 Areco Finances Et Technologie - Arfitec Dispositif de generation de gouttelettes a partir d'un liquide comprenant des moyens de ventilation ameliores, et son procede de mise en œuvre
CN113390151A (zh) * 2021-05-13 2021-09-14 范海良 一种带有超声波定向加湿功能的空气净化器

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JPH09192555A (ja) 1997-07-29
EP0782885B1 (de) 2001-10-24
FR2743313A1 (fr) 1997-07-11
DE69707511T2 (de) 2002-07-18
FR2743313B1 (fr) 1998-02-06
DE69707511D1 (de) 2001-11-29
US5836515A (en) 1998-11-17

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