WO2008015394A1 - An ultrasonic atomiser for the dispersal of a liquid - Google Patents

An ultrasonic atomiser for the dispersal of a liquid Download PDF

Info

Publication number
WO2008015394A1
WO2008015394A1 PCT/GB2007/002863 GB2007002863W WO2008015394A1 WO 2008015394 A1 WO2008015394 A1 WO 2008015394A1 GB 2007002863 W GB2007002863 W GB 2007002863W WO 2008015394 A1 WO2008015394 A1 WO 2008015394A1
Authority
WO
WIPO (PCT)
Prior art keywords
wick
transducer
atomiser
liquid
reservoir
Prior art date
Application number
PCT/GB2007/002863
Other languages
French (fr)
Inventor
David Healy
Kuldeep Kanwar
Joss Langford
Steve Walsh
Original Assignee
Reckitt Benckiser (Uk) Limited
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 Reckitt Benckiser (Uk) Limited filed Critical Reckitt Benckiser (Uk) Limited
Publication of WO2008015394A1 publication Critical patent/WO2008015394A1/en

Links

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
    • B05B17/0638—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 by discharging the liquid or other fluent material through a plate comprising a plurality of orifices
    • B05B17/0646—Vibrating plates, i.e. plates being directly subjected to the vibrations, e.g. having a piezoelectric transducer attached thereto
    • 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
    • B05B17/0653—Details
    • B05B17/0669—Excitation frequencies
    • 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
    • B05B17/0653—Details
    • B05B17/0676—Feeding means
    • B05B17/0684—Wicks or the like

Definitions

  • the present invention relates to an atomiser for the dispersal of a liquid.
  • Atomisers for dispensing of liquids are well known in the art.
  • US 4,415,121 discloses an atomiser having collapsible sides and an oscillating section to produce the mist to be sprayed from the atomiser.
  • RTM Glade
  • RTM Wisp
  • This comprises a wick which is placed in the reservoir of material to be dispensed.
  • the wick leads to a position adjacent to a vibrating plate which is provided with a plurality of fine holes.
  • the plate must be carefully manufactured to ensure that the hole dimensions are well controlled and consistent. Liquid from the wick is held in a gap between the wick and plate. As the plate is vibrated, this liquid is dispersed through the holes in the orifice plate.
  • the gap between the wick and the transducer must be ti,ghtly controlled in order to optimise the efficiency of the ejection of the liquid droplets while ensuring that the presence of the wick does not adversely affect the vibration of the transducer. This can be difficult to achieve in practice.
  • an atomiser for the dispersal of a liquid comprising a reservoir of liquid, a wick in communication with the reservoir and a vibratable transducer in contact with a portion of the wick spaced from the reservoir and arranged to vibrate together with the portion of the wick to disperse liquid held by the wick in a direction from the wick away from the transducer.
  • the transducer is therefore a simple component and the potential for clogging is significantly reduced.
  • the invention therefore provides a simple and reliable atomiser in comparison with the prior art.
  • the transducer is preferably arranged to vibrate at a frequency of between 2OkHz and 2MHz, more preferably between 2OkHz and 200 kH, most preferably between 3OkHz and 150 kHz, such as 5OkHz and 100 kHz.
  • the transducer is a piezo electric transducer.
  • the atomiser is suitable for use with any liquid to be atomised.
  • it may be used for products such as fragrances, pesticides, detergents, malodour counteractants, water (for a humidifier) , or any other type of liquid or combination of liquids dispersed by atomisation.
  • the reservoir 1 is filled with a liquid 2 to be atomised.
  • a wick 3 leads from the fluid 2 to a transducer 4.
  • the wick may be fixed to the transducer for example using one or more clips, or may be bonded by an adhesive. Alternatively, it may simply rest on the transducer. However, it is important that the wick is in contact with the transducer and vibrates with it.
  • the wick is made of any fibrous material that is sufficiently flexible and of low enough mass not to severely dampen the motion of the transducer 4.
  • Woven cloth such as cotton or similar man- made materials would be suitable as would any fibre specifically optimised and woven for wicking and/or soaking up fluid such as those used in cleaning cloths and advanced outdoor clothing.
  • a non-fibrous wick such as a plastic moulded wick could also be used.
  • the transducer 4 is preferably a piezo electric transducer.
  • the transducer 4 is connected to a control circuit (not shown) and a suitable power source, preferably a battery, (not shown) is provided to power the transducer.
  • a suitable power source preferably a battery
  • the activation of the transducer may be determined automatically by the user to operate the atomiser at predetermined periodic intervals, or it may be responsive to some change in external conditions such as light level or temperature. Alternatively, it may be manually activated by a user by an appropriate switch.
  • the wick 3 covers substantially the entire surface of the transducer 4. This ensures that there is a constant supply of liquid across the surface of the transducer.
  • the transducer 4 is activated the liquid on its surface together with the portion of the wick which is attached to the transducer is vibrated thereby atomising the liquid as shown.
  • the droplet size can be controlled by controlling the vibration frequency of the transducer. Smaller droplets are generated at high frequency. However, this leads to a greater power consumption.
  • the device can therefore be optimised to provide the optimum droplet size for a particular; application having regarding to the available power supply. It is envisaged that the frequency of the transducer could be from 2OkHz to 2MHz, but in practice may not be much beyond 10OkHz or 15OkHz.
  • a second wick, or a branch from the first wick can cover some or all ⁇ of the opposite side of the transducer 4.
  • the wick may have a branch extending from the wick itself and this branch may cover at least a part of the opposite side of the transducer to that which is in contact with the wick itslf. It is preferred that the branch covers substantially all of the opposite side of the transducer.

Abstract

The invention provides an atomiser for the dispersal of a liquid, the atomiser comprising a reservoir (1) of liquid (2), a wick (3) in communication with the reservoir and a vibratable transducer (4) in contact with a portion of the wick spaced from the reservoir and arranged to vibrate together with the portion of the wick to disperse liquid held by the wick in a direction from the wick away from the transducer. This arrangement is simple to manufacture and the potential for clogging of the atomiser is significantly reduced.

Description

AN ULTRASONIC ATOMISER FOR THE DISPERSAL OF A LIQUID
Technical field
The present invention relates to an atomiser for the dispersal of a liquid.
Background and prior art
Atomisers for dispensing of liquids are well known in the art. For example US 4,415,121 discloses an atomiser having collapsible sides and an oscillating section to produce the mist to be sprayed from the atomiser.
Another atomiser is currently in use by SC Johnson in their Glade (RTM) Wisp (RTM) air freshener. This comprises a wick which is placed in the reservoir of material to be dispensed. The wick leads to a position adjacent to a vibrating plate which is provided with a plurality of fine holes. The plate must be carefully manufactured to ensure that the hole dimensions are well controlled and consistent. Liquid from the wick is held in a gap between the wick and plate. As the plate is vibrated, this liquid is dispersed through the holes in the orifice plate.
A further example of a similar atomiser is disclosed in US 5,299,739. This uses a wick which leads to a mesh adjacent to a vibrating transducer. The mesh is spaced from the transducer with a gap between the two. This gap provides a capillary space along which liquid flows in order to cover the surface of the transducer. As the transducer vibrates, it pushes the liquid through orifices in the mesh thereby dispensing the material. The mesh must be carefully manufactured to ensure that the hole dimensions are well controlled and consistent.
In both of the prior art dispensers, the gap between the wick and the transducer must be ti,ghtly controlled in order to optimise the efficiency of the ejection of the liquid droplets while ensuring that the presence of the wick does not adversely affect the vibration of the transducer. This can be difficult to achieve in practice.
It is an object of the present invention to address one or more of the above-mentioned problems. In particular it is an object of the present invention to provide an improved design of an atomiser.
Statement of invention
According to the present invention, there is provided an atomiser for the dispersal of a liquid, the atomiser comprising a reservoir of liquid, a wick in communication with the reservoir and a vibratable transducer in contact with a portion of the wick spaced from the reservoir and arranged to vibrate together with the portion of the wick to disperse liquid held by the wick in a direction from the wick away from the transducer.
Fixing the transducer to the wick ensures that the wick vibrates, together with the transducer thereby eliminating the need for a closely controlled gap. Also, as the fluid .is expelled from the wick in a direction away from the transducer, there is no need to provide the transducer with finely controlled orifices. The transducer is therefore a simple component and the potential for clogging is significantly reduced. The invention therefore provides a simple and reliable atomiser in comparison with the prior art.
The transducer is preferably arranged to vibrate at a frequency of between 2OkHz and 2MHz, more preferably between 2OkHz and 200 kH, most preferably between 3OkHz and 150 kHz, such as 5OkHz and 100 kHz.
It is also preferred according to the present invention that the transducer is a piezo electric transducer.
Detailed description
An example of an atomiser in accordance with the present invention will now be described with reference to the accompanying drawing which is a schematic cross-section of the atomiser.
The atomiser is suitable for use with any liquid to be atomised. In particular, it may be used for products such as fragrances, pesticides, detergents, malodour counteractants, water (for a humidifier) , or any other type of liquid or combination of liquids dispersed by atomisation.
As shown in the accompanying drawing, figure 1, the reservoir 1 is filled with a liquid 2 to be atomised. A wick 3 leads from the fluid 2 to a transducer 4. The wick may be fixed to the transducer for example using one or more clips, or may be bonded by an adhesive. Alternatively, it may simply rest on the transducer. However, it is important that the wick is in contact with the transducer and vibrates with it.
According to one embodiment the wick is made of any fibrous material that is sufficiently flexible and of low enough mass not to severely dampen the motion of the transducer 4. Woven cloth such as cotton or similar man- made materials would be suitable as would any fibre specifically optimised and woven for wicking and/or soaking up fluid such as those used in cleaning cloths and advanced outdoor clothing. However, as an alternative a non-fibrous wick such as a plastic moulded wick could also be used.
The transducer 4 is preferably a piezo electric transducer.
The transducer 4 is connected to a control circuit (not shown) and a suitable power source, preferably a battery, (not shown) is provided to power the transducer. The activation of the transducer may be determined automatically by the user to operate the atomiser at predetermined periodic intervals, or it may be responsive to some change in external conditions such as light level or temperature. Alternatively, it may be manually activated by a user by an appropriate switch.
The wick 3 covers substantially the entire surface of the transducer 4. This ensures that there is a constant supply of liquid across the surface of the transducer. When the transducer 4 is activated the liquid on its surface together with the portion of the wick which is attached to the transducer is vibrated thereby atomising the liquid as shown.
The droplet size can be controlled by controlling the vibration frequency of the transducer. Smaller droplets are generated at high frequency. However, this leads to a greater power consumption. The device can therefore be optimised to provide the optimum droplet size for a particular; application having regarding to the available power supply. It is envisaged that the frequency of the transducer could be from 2OkHz to 2MHz, but in practice may not be much beyond 10OkHz or 15OkHz.
In order to improve the capacity of the device, a second wick, or a branch from the first wick can cover some or all \of the opposite side of the transducer 4. In particular the wick may have a branch extending from the wick itself and this branch may cover at least a part of the opposite side of the transducer to that which is in contact with the wick itslf. It is preferred that the branch covers substantially all of the opposite side of the transducer.

Claims

CLAIMS :
1. An atomiser for the dispersal of a liquid, the atomiser comprising a reservoir of liquid, a wick in communication with the reservoir and a vibratable transducer in contact with a portion of the wick spaced from the reservoir and arranged to vibrate together with the portion of the wick to disperse liquid held by the wick in a direction from the wick away from the transducer.
2. An atomiser according to claim 1, wherein the transducer is arranged to vibrate at a frequency of 2OkHz to 2MHz.
3. An atomiser according to claim 2, wherein the transducer is arranged to vibrate at a frequency of 2OkHz to 20OkHz.
4. An atomiser according to any one of claims 1 to 3, wherein the transducer is a piezo electric transducer.
5. An atomiser according to any one of claims 1 to 4, wherein the atomiser comprises a second wick.
6. An atomiser according to any one of claims 1 to 4, wherein the wick has a branch extending therefrom, which branch covers at least a part of the opposite side of the transducer to that which is in contact with the wick.
PCT/GB2007/002863 2006-08-02 2007-07-27 An ultrasonic atomiser for the dispersal of a liquid WO2008015394A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0615303A GB0615303D0 (en) 2006-08-02 2006-08-02 An atomiser for the dispersal of a liquid
GB0615303.5 2006-08-02

Publications (1)

Publication Number Publication Date
WO2008015394A1 true WO2008015394A1 (en) 2008-02-07

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Country Status (2)

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GB (1) GB0615303D0 (en)
WO (1) WO2008015394A1 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008107636A1 (en) * 2007-03-07 2008-09-12 Reckitt Benckiser (Uk) Limited A free standing treatment device for a dishwasher
US7547004B2 (en) * 2006-12-05 2009-06-16 Tsang-Hung Hsu Ergonomically operating portable humidifier
EP2100671A1 (en) 2008-03-12 2009-09-16 EP Systems SA Method and device for nebulising high-viscosity liquids with minimal fallback
US7883031B2 (en) 2003-05-20 2011-02-08 James F. Collins, Jr. Ophthalmic drug delivery system
US8012136B2 (en) 2003-05-20 2011-09-06 Optimyst Systems, Inc. Ophthalmic fluid delivery device and method of operation
US8684980B2 (en) 2010-07-15 2014-04-01 Corinthian Ophthalmic, Inc. Drop generating device
US8733935B2 (en) 2010-07-15 2014-05-27 Corinthian Ophthalmic, Inc. Method and system for performing remote treatment and monitoring
US9087145B2 (en) 2010-07-15 2015-07-21 Eyenovia, Inc. Ophthalmic drug delivery
WO2016118941A1 (en) * 2015-01-23 2016-07-28 William Tan Ultrasonic vaporizing element
EP3181242A1 (en) 2015-12-16 2017-06-21 Idfc Ag Ultrasonic fluid dispersal device
US10154923B2 (en) 2010-07-15 2018-12-18 Eyenovia, Inc. Drop generating device
US10639194B2 (en) 2011-12-12 2020-05-05 Eyenovia, Inc. High modulus polymeric ejector mechanism, ejector device, and methods of use
US11325149B2 (en) 2016-01-23 2022-05-10 William Tan Ultrasonic atomizer and cartridge for the dispersal of a liquid
US11938056B2 (en) 2017-06-10 2024-03-26 Eyenovia, Inc. Methods and devices for handling a fluid and delivering the fluid to the eye

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US4334531A (en) * 1979-06-19 1982-06-15 Bosch-Siemens Hausgerate Gmbh Inhalator
US4790479A (en) * 1984-09-07 1988-12-13 Omron Tateisi Electronics Co. Oscillating construction for an ultrasonic atomizer inhaler
EP0897755A2 (en) * 1997-08-20 1999-02-24 Fumakilla Limited Piezoelectric chemical-liquid atomizer apparatus and method for repelling or eliminating harmful organism
WO2000051747A1 (en) * 1999-03-05 2000-09-08 S. C. Johnson & Son, Inc. Control system for atomizing liquids with a piezoelectric vibrator
US6755352B1 (en) * 2003-01-22 2004-06-29 Kohji Toda Bridge-type ultrasonic atomizer
US20040261790A1 (en) * 2003-06-30 2004-12-30 Microlin, L.C. Moving emanators
WO2007104859A1 (en) * 2006-03-15 2007-09-20 L V M H Recherche Spray device having a piezoelectric element, and its use in cosmetology and perfumery

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334531A (en) * 1979-06-19 1982-06-15 Bosch-Siemens Hausgerate Gmbh Inhalator
US4790479A (en) * 1984-09-07 1988-12-13 Omron Tateisi Electronics Co. Oscillating construction for an ultrasonic atomizer inhaler
EP0897755A2 (en) * 1997-08-20 1999-02-24 Fumakilla Limited Piezoelectric chemical-liquid atomizer apparatus and method for repelling or eliminating harmful organism
EP1382399A1 (en) * 1997-08-20 2004-01-21 Fumakilla Limited Method for repelling or eliminating harmful organism
WO2000051747A1 (en) * 1999-03-05 2000-09-08 S. C. Johnson & Son, Inc. Control system for atomizing liquids with a piezoelectric vibrator
US6755352B1 (en) * 2003-01-22 2004-06-29 Kohji Toda Bridge-type ultrasonic atomizer
US20040261790A1 (en) * 2003-06-30 2004-12-30 Microlin, L.C. Moving emanators
WO2007104859A1 (en) * 2006-03-15 2007-09-20 L V M H Recherche Spray device having a piezoelectric element, and its use in cosmetology and perfumery

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8936021B2 (en) 2003-05-20 2015-01-20 Optimyst Systems, Inc. Ophthalmic fluid delivery system
US7883031B2 (en) 2003-05-20 2011-02-08 James F. Collins, Jr. Ophthalmic drug delivery system
US8012136B2 (en) 2003-05-20 2011-09-06 Optimyst Systems, Inc. Ophthalmic fluid delivery device and method of operation
US8545463B2 (en) 2003-05-20 2013-10-01 Optimyst Systems Inc. Ophthalmic fluid reservoir assembly for use with an ophthalmic fluid delivery device
US7547004B2 (en) * 2006-12-05 2009-06-16 Tsang-Hung Hsu Ergonomically operating portable humidifier
WO2008107636A1 (en) * 2007-03-07 2008-09-12 Reckitt Benckiser (Uk) Limited A free standing treatment device for a dishwasher
EP2100671A1 (en) 2008-03-12 2009-09-16 EP Systems SA Method and device for nebulising high-viscosity liquids with minimal fallback
EP2100670A1 (en) 2008-03-12 2009-09-16 Microflow Engineering SA Method and device for evaporating high-viscosity liquids with minimal fallback
US8011599B2 (en) 2008-03-12 2011-09-06 Ep Systems Sa Microflow Division Method and device for nebulising high-viscosity liquids with minimal fallback
US8684980B2 (en) 2010-07-15 2014-04-01 Corinthian Ophthalmic, Inc. Drop generating device
US8733935B2 (en) 2010-07-15 2014-05-27 Corinthian Ophthalmic, Inc. Method and system for performing remote treatment and monitoring
US9087145B2 (en) 2010-07-15 2015-07-21 Eyenovia, Inc. Ophthalmic drug delivery
US11839487B2 (en) 2010-07-15 2023-12-12 Eyenovia, Inc. Ophthalmic drug delivery
US11398306B2 (en) 2010-07-15 2022-07-26 Eyenovia, Inc. Ophthalmic drug delivery
US11011270B2 (en) 2010-07-15 2021-05-18 Eyenovia, Inc. Drop generating device
US10839960B2 (en) 2010-07-15 2020-11-17 Eyenovia, Inc. Ophthalmic drug delivery
US10073949B2 (en) 2010-07-15 2018-09-11 Eyenovia, Inc. Ophthalmic drug delivery
US10154923B2 (en) 2010-07-15 2018-12-18 Eyenovia, Inc. Drop generating device
US10639194B2 (en) 2011-12-12 2020-05-05 Eyenovia, Inc. High modulus polymeric ejector mechanism, ejector device, and methods of use
US10646373B2 (en) 2011-12-12 2020-05-12 Eyenovia, Inc. Ejector mechanism, ejector device, and methods of use
CN107206198A (en) * 2015-01-23 2017-09-26 陈苇濂 Ultrasonic wave evaporation element
US20160213866A1 (en) * 2015-01-23 2016-07-28 William Tan Ultrasonic vaporizing element
WO2016118941A1 (en) * 2015-01-23 2016-07-28 William Tan Ultrasonic vaporizing element
EP3181242A1 (en) 2015-12-16 2017-06-21 Idfc Ag Ultrasonic fluid dispersal device
US11325149B2 (en) 2016-01-23 2022-05-10 William Tan Ultrasonic atomizer and cartridge for the dispersal of a liquid
US11938056B2 (en) 2017-06-10 2024-03-26 Eyenovia, Inc. Methods and devices for handling a fluid and delivering the fluid to the eye

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