EP1095704A1 - Elektrostatische Flüssigkeitssprühvorrichtung - Google Patents

Elektrostatische Flüssigkeitssprühvorrichtung Download PDF

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Publication number
EP1095704A1
EP1095704A1 EP99440297A EP99440297A EP1095704A1 EP 1095704 A1 EP1095704 A1 EP 1095704A1 EP 99440297 A EP99440297 A EP 99440297A EP 99440297 A EP99440297 A EP 99440297A EP 1095704 A1 EP1095704 A1 EP 1095704A1
Authority
EP
European Patent Office
Prior art keywords
spraying device
wick
liquid spraying
electrostatic liquid
receiving chamber
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
EP99440297A
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English (en)
French (fr)
Other versions
EP1095704B1 (de
Inventor
Bernard Vallat
Benoít Geiger
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE69920914T priority Critical patent/DE69920914T2/de
Priority to ES99440297T priority patent/ES2230822T3/es
Priority to EP99440297A priority patent/EP1095704B1/de
Priority to AT99440297T priority patent/ATE278473T1/de
Publication of EP1095704A1 publication Critical patent/EP1095704A1/de
Application granted granted Critical
Publication of EP1095704B1 publication Critical patent/EP1095704B1/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
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/0255—Discharge apparatus, e.g. electrostatic spray guns spraying and depositing by electrostatic forces only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1691—Apparatus to be carried on or by a person or with a container fixed to the discharge device

Definitions

  • the present invention relates to a spraying device electrostatic liquid, very conventionally comprising a wick emission of microdrops in contact with an electrode subjected to a high tension, said wick having an emission end in the form of tip for spraying precisely by the so-called effect of point.
  • This long-known peak effect is used in many many applications, including spraying micro amounts of ink on paper-type media in printing devices, the misting of particles in the atmosphere for therapeutic purposes (aromatherapy), olfactory (diffusion of perfumes), pesticides, etc.
  • the existing devices use the capillary forces to supply the end of the wick with liquid. What is called very generally the wick is therefore a structure allowing progression liquid by capillary action.
  • the material and layout configuration chosen for the drill bit are particularly critical elements of the study because they determine the amount of liquid available at the tip, knowing that the spraying is not carried out correctly when the quantity of liquid is too large, or for that matter when it is too low.
  • the preferred field of application of the invention is that of diffusion of perfumes in the atmosphere.
  • the document PCT W092 / 15339 describes an electrostatic generator of aerosols emitting in particular products intended to perfume the ambient air.
  • the structure of the apparatus described comprises a capillary element provided with a plurality of filaments, annularly arranged around a structural electrode complex, and whose free ends form a slightly clump flared outwards.
  • These filaments for example made of glass fibers, can be braided, and / or assembled in groups distributed on the periphery annular, thus forming a kind of fiber sleeve surrounding the complex structure forming electrode. Said sleeve is itself surrounded a protective and / or stiffening envelope.
  • the assembly is then partially immersed in a tank or a cartridge filled with liquid to vaporize, the latter moistening gradually the fibers by capillary action.
  • a tank or a cartridge filled with liquid to vaporize, the latter moistening gradually the fibers by capillary action.
  • the liquid to be emitted is present in the form of a film placed on the walls of the filaments.
  • the management of said film poses the problems mentioned before, and is specific to the system parameters: nature of the filaments, length and beam structure, etc.
  • the elements and results described are of course not generalizable to other devices if the structure, configuration, and the materials of these are different. This is the case for the device of the invention.
  • the material constituting the wick is for example absorbent, and the wick shape is not annular but compact, with a point at one of its ends. Especially for these reasons, obtaining a vaporization device emitting micro drops of a perfectly controlled and regulated manner results from a specific study resulting in a particular configuration.
  • the main electrostatic spray device of the invention comprises a wick for emitting micro-drops supplied in liquid by absorption, since a part is immersed in said liquid, said cylindrical wick having an emission end tip-shaped external powered by capillary action, and also being contact with an electrode subjected to a high voltage allowing said peak effect spraying.
  • the wick is arranged vertically in a receiving chamber made of insulating material which is continuously supplied with liquid to be emitted.
  • the wick made in one absorbent capillary material having an electrical resistance provided for maintain the current at a safety level allowing contact without risk, soaking over substantially the lower half of its length in the liquid and is contained on substantially its upper half in a nozzle passing through a wall of the receiving chamber, outside of which said nozzle flares around the pointed end of the wick, the total length of the wick being such that the capillary forces are kept substantially constant.
  • An electrode immersed in the liquid filling the receiving chamber is in contact with said wick near its lower end.
  • the structure obtained was notably designed to guarantee safety maximum of users. Despite the high operating voltage, necessary to apply the principle that is the basis of the device it is indeed theoretically possible to touch any part of the device without risk of electric shock, because the current is maintained at a extremely low value, due to the technical choices made for the device design.
  • the invention is in fact the fruit of a systematic desire for optimization elements and groups of elements that constitute it, as well as functional and structural interdependencies that link them. All the In particular, the following parameter values have been determined after extensive and repeated testing.
  • the continuous supply of the receiving chamber is produced by gravitational flow from a reservoir adjoining said reception room.
  • the reception room is horizontal in appearance, the electrode being disposed axially there and covered over almost its entire length in said chamber by a sleeve insulation allowing the end to protrude into contact with the wick.
  • the electrode is therefore perfectly isolated from the liquid over almost its entire length.
  • This circuit is classic, for example based on a Greinacher assembly allowing the production of high voltage by multiplication of a voltage initial thanks to a succession of Schenkel doublers.
  • an anti-Corona sphere is preferably made of aluminum, as well as the electrode.
  • the voltage delivered to the electrode is between 20 kV and 25 kV, and from preferably between 23 kV and 24 kV.
  • a negative DC voltage of the order of 23 kV is used, the current being kept at a very low value, of the order of 10 -9 A.
  • the short distance traveled by the liquid under tension in the wick, the use of an absorbent non-conductive material for said wick, the resistivity of the liquid, greater than 10 6 ⁇ m and the very low value of the current favor the spraying while preventing the maintenance of a current at its free end. in tip shape.
  • the risks of arcing or electrocution are minimal, even non-existent.
  • the choice of highly insulating materials at all levels contributes to this result.
  • the wick is of length between 10 and 20 mm, preferably between 13 mm and 17 mm for a diameter of one value from 1.4 mm to 2 mm.
  • this wick and acetate It's the case in particular for the applications of the device of the invention such as fragrance diffuser used individually.
  • the wick can be provided in polyamide.
  • the section of the wick can then have a pattern depending on the type of emission desired.
  • the short length of the wick allows to maintain the forces of substantially constant capillarity, which avoids as mentioned previously the use of external drive means to ensure optimal liquid availability at the tip.
  • the wick plunges into the liquid contained in the reception, the internal volume of which is preferably cylindrical and connected by a channel opening in its lower part to a pace tank vertical, giving the receiving chamber an overall shape in L to the device.
  • the intervals of the optimal values, obtained by tests, are as follows: the internal volume of the receiving chamber is between 1.5 and 2.5 cm 3 , and the diameter of the connection channel with the reservoir is between 1, 8 and 2.2 mm.
  • the receiving chamber and the tank are made in one piece of a insulating material closed at both ends along the axis of the chamber reception by a blanking plug for the latter and a plate closure for the tank.
  • the upper wall of the vertical tank has an opening threaded, which can alternatively be blocked by a threaded plug or by a drilled screw, then acting respectively as a filling orifice or vent.
  • the insulating materials used have a dielectric constant of preferably between 25 and 50 kV / mm.
  • a dielectric constant preferably between 25 and 50 kV / mm.
  • high density polyethylene preferably polyethylene.
  • the high voltage generator is itself insulated, and designed not to generate no parasite.
  • the voltage value required to obtain the peak effect is notably determined by the resistivity of the liquid.
  • the flow of liquid is approximately 0.05 ml per hour in continuous operation.
  • a tank with a capacity of 40 ml is therefore sufficient for one month.
  • Vaporization is for example much more delicate to check if the ambient temperature drops below a threshold set at around 20 ° C.
  • the olfactory yield which depends on the evaporation of the micro drops sprayed, is no longer as high if the temperature drops, due to lower evaporation.
  • the device of the invention is therefore, if necessary, arranged in a special environment which favors spraying and evaporation.
  • An additional system for pulsing, at the outlet of the nozzle, air at a temperature at least equal to 20 ° C., said system having furthermore been designed to create a depression in the outlet zone nozzle.
  • this additional system includes a venturi at one ends of which are successively arranged a resistor heater and a fan, and in the central part of reduced section from which is made an orifice receiving the flared part of the nozzle containing the tip of the wick.
  • the heated air is forced into one of the two divergent cones of the venturi, which has the effect of increasing its speed at the emitting tip.
  • the heating resistor is coupled to a sensor of temperature which activates said resistance when the air temperature is measured at a value below 20 ° C.
  • the external volume of the venturi consists of two end portions parallelepiped-shaped and also of a central portion parallelepiped of lower section, leaving free on two sides a prismatic volume in L in which the device is adjusted and fixed spraying, the nesting of the two elements giving the whole a external volume of general parallelepipedal appearance.
  • the assembly formed by the two nested elements is fixed axially to a box also of parallelepipedal shape containing electrical circuits for generating a high voltage, for managing timing of spraying, fan management and resistance heater, as well as these last two elements, as described in more detail below.
  • a conventional electronic circuit therefore allows intermittent spraying, with a stop time for example equal to the duration of active operation.
  • the part of the venturi / spraying device protruding from said housing is covered with a sliding cover of external section substantially equal to that of said housing, and completing it.
  • the distinctive elements of the heart of the invention appear in FIG. 1.
  • the L-shaped prismatic volume includes a receiving chamber (1) horizontal in appearance adjoining a tank (2) vertical in appearance.
  • a canal (3) small diameter connects the two containers, allowing the liquid stored in said tank (2) to flow by gravity to the chamber (1), in which the lower part of the wick (4) dips.
  • the level in the receiving chamber (1) must remain substantially constant, so that the submerged length of the wick is also constant, and that the capillary forces can always be exerted under the same conditions.
  • the wick (4) is centered in a funnel-shaped nozzle (5), the flared part opens towards the outside of the upper wall of the reception room (1).
  • the tip (6) of this wick (4) is entirely contained in the flared volume of the nozzle (5).
  • the wick (4) is in contact with an electrode metallic (7), preferably aluminum, which is surrounded on almost its entire length by an insulating sleeve (8).
  • the top of the tank (2) comprises for example a drilled screw (9) of which the orifice serves as a vent in normal operation.
  • the threaded hole in which is inserted the screw serves as a more filling hole (via a syringe or equivalent) when the liquid level is insufficient.
  • the receiving chamber (1) and the tank are made in one part, except for a closure plate (10) for the tank (2) and a closure plug (11) for the receiving chamber (1), preferably high density polyethylene.
  • This plug (11) very shown schematically in Figure 1, appears more explicitly in Figure 2.
  • the tank (2) has a capacity of around 40 ml, while the receiving chamber (1) has a volume of approximately 2 ml, connected to the reservoir by a conduit having a diameter of approximately 1.5 mm.
  • the wick (4) made of acetate, has a length not exceeding 15 mm, and it is in contact with an electrode (7) having a diameter of approximately 2 mm.
  • This electrode (7) is connected to a high voltage wire (12) via a anti-Corona sphere (13).
  • the walls of the receiving chamber (1) have a thickness of approximately 6 mm which guarantees perfect electrical insulation, insulation which is supplemented by the other dielectric components of the system: liquid, wick, nozzle, etc ... which have resistivities and / or high dielectric constants.
  • the blanking plug (11) also made of high density polyethylene dielectric constant between 25 and 50 kV / mm, has a internal bore (14) housing the anti-Corona sphere (13) and the sleeve (8) surrounding the electrode (7).
  • An external thread (15) allows its fixing by screwing at the axial end of the receiving chamber (1).
  • the wire (12) allows the connection with the electronic circuit producing the high voltage, in the occurrence a negative DC voltage of approximately 23 kV.
  • Figure 3 specifies the exact shape of the nozzle (5), substantially in funnel with a lower cylindrical part intended to be inserted in an orifice of corresponding dimension made in the wall upper of the reception room (1).
  • the acetate wick (4) has the additional advantage of retaining the liquid, which does not drip when tilting the system.
  • Figure 4 shows the part of the system intended to pulsate air at the level of the nozzle (5), secondarily creating a depression favoring the rise of the liquid in the wick (4). It is actually a kind of venturi with two portions of cones (20, 21) connected by a cylindrical portion (22) into which an orifice (23) which also leads into a recess (24) of the envelope (B) containing the venturi, recess (24) which has a substantially parallelepipedal appearance.
  • This recess (24) is extended on the rear face of the envelope (B) of the venturi by a second recess (25) perpendicular to the first, giving the whole a hollow L-shape. It is in this L-shaped housing that fits the tank (2) / receiving chamber (1) assembly shown in Figure 1, the nozzle (5) then being housed in the orifice (23). The upper end of said nozzle (5) containing the tip (6) of the wick (4) thus opens into the cylindrical section (22) of the venturi.
  • the housings (26, 27) formed in the sole of the envelope (B) of the venturi allow the fixing of a tab C (not shown) fixing itself the spraying device, by any known means, to the envelope (B).
  • Two lateral recesses (28, 29) are used to fix the enclosure (B) of the venturi in a housing (30) shown in Figure 5.
  • One piece front (31) consisting of two symmetrical parts comes for this purpose enclose the envelope (B) of the venturi, at the level of the recesses (28, 29) arranged on either side of the cone (21).
  • the assembly is then slipped in rails (35) of the lower cover (32) fitting in slides side (33, 34) of the front piece (31), the same rails existing in the upper cover (36) for closing the housing (30).
  • Hoods (32, 36) can then if necessary be screwed into said grooves (33, 34), and in similar grooves made in the opposite wall (37) of the housing (30).
  • the latter has an additional intermediate wall (38) which use will be seen below.
  • a passage (39) has been provided for the wiring in the front piece (31).
  • FIG. 6 schematically represents the content of the housing (30): the power supply is shown to the left of the intermediate wall (38), and comprises a transformer (40) and a card comprising the multiplier tension (41). To the right of this wall, there are successively the fan (42) in the axis of the inlet cone (21) and the resistance (43) heating, allowing air to be forced into the venturi heated, if the temperature sensor (not shown) indicates that the temperature fell below the critical threshold of 20 ° C.
  • Figure 5 shows that the intermediate wall (34) has a cutout (44) surmounting the bottom of the housing (30) allowing passage the whole management electronic card, located nearby and parallel to said bottom.
  • the device of the invention can of course operate with the energy of the sector.
  • the covers (32, 36) and partitions (37, 38) are for example made of Expanded PVC.
  • the heating resistor has a power of the order of 100 W, in the configuration used.
  • An additional hood sliding (not shown), having the same external dimensions that the housing (30) is intended to slide around the part of the envelope (B) external to the housing (30) and can come, in the closed position, to the contact with the latter, or free access to the spraying device by open position, for example for filling the tank.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Catching Or Destruction (AREA)
EP99440297A 1999-10-29 1999-10-29 Elektrostatische Flüssigkeitssprühvorrichtung Expired - Lifetime EP1095704B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69920914T DE69920914T2 (de) 1999-10-29 1999-10-29 Elektrostatische Flüssigkeitssprühvorrichtung
ES99440297T ES2230822T3 (es) 1999-10-29 1999-10-29 Dispositivo de pulverizacon electrostatica de liquido.
EP99440297A EP1095704B1 (de) 1999-10-29 1999-10-29 Elektrostatische Flüssigkeitssprühvorrichtung
AT99440297T ATE278473T1 (de) 1999-10-29 1999-10-29 Elektrostatische flüssigkeitssprühvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99440297A EP1095704B1 (de) 1999-10-29 1999-10-29 Elektrostatische Flüssigkeitssprühvorrichtung

Publications (2)

Publication Number Publication Date
EP1095704A1 true EP1095704A1 (de) 2001-05-02
EP1095704B1 EP1095704B1 (de) 2004-10-06

Family

ID=8242389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99440297A Expired - Lifetime EP1095704B1 (de) 1999-10-29 1999-10-29 Elektrostatische Flüssigkeitssprühvorrichtung

Country Status (4)

Country Link
EP (1) EP1095704B1 (de)
AT (1) ATE278473T1 (de)
DE (1) DE69920914T2 (de)
ES (1) ES2230822T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007077424A1 (en) 2006-01-05 2007-07-12 Aerstream Technology Limited Electrostatic spray device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0486198A1 (de) * 1990-11-12 1992-05-20 Imperial Chemical Industries Plc Sprühvorrichtung
WO1992015339A1 (en) * 1991-03-11 1992-09-17 Peltier Mark E Electrostatic vapor-aerosol generator
US5810265A (en) * 1994-09-07 1998-09-22 Reckitt & Colman Products Limited Electrostatic spraying device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0486198A1 (de) * 1990-11-12 1992-05-20 Imperial Chemical Industries Plc Sprühvorrichtung
WO1992015339A1 (en) * 1991-03-11 1992-09-17 Peltier Mark E Electrostatic vapor-aerosol generator
US5810265A (en) * 1994-09-07 1998-09-22 Reckitt & Colman Products Limited Electrostatic spraying device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007077424A1 (en) 2006-01-05 2007-07-12 Aerstream Technology Limited Electrostatic spray device

Also Published As

Publication number Publication date
ATE278473T1 (de) 2004-10-15
DE69920914T2 (de) 2005-10-13
EP1095704B1 (de) 2004-10-06
ES2230822T3 (es) 2005-05-01
DE69920914D1 (de) 2004-11-11

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