WO2016019479A1 - Atomiseur à ultrasons - Google Patents

Atomiseur à ultrasons Download PDF

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Publication number
WO2016019479A1
WO2016019479A1 PCT/CL2015/050030 CL2015050030W WO2016019479A1 WO 2016019479 A1 WO2016019479 A1 WO 2016019479A1 CL 2015050030 W CL2015050030 W CL 2015050030W WO 2016019479 A1 WO2016019479 A1 WO 2016019479A1
Authority
WO
WIPO (PCT)
Prior art keywords
perforation
plate
liquid
atomizer according
atomized
Prior art date
Application number
PCT/CL2015/050030
Other languages
English (en)
Spanish (es)
Inventor
Renato GALLEGUILLOS SILVA
María Belén RAMÍREZ BUNSTER
Yolanda VARGAS HERNÁNDEZ
Luis GAETE GARRETÓN
Original Assignee
Universidad De Santiago De Chile
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 Universidad De Santiago De Chile filed Critical Universidad De Santiago De Chile
Publication of WO2016019479A1 publication Critical patent/WO2016019479A1/fr

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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
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • 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

Definitions

  • the present invention relates to a vibrating plate of rectangular or circular shape that is excited by an ultrasonic transducer, which transforms a jet of liquid into a plurality of atomized droplets, which can be used in solid-liquid separation processes, in particle generation processes, in the dosing of products such as drugs.
  • the present invention specifically relates to an atomizer using said vibrating plate, wherein the liquid enters through a node of the vibratory wave in the plate and is sprayed out by a belly of the same wave.
  • the atomization of liquids by ultrasonic route is well known.
  • the liquid stored in a container is passed through a vibrating medium in which a portion of the liquid is atomized and suctioned by the patient.
  • ultrasonic transducers are used in dryers. Many times it is desired to obtain a pulverized product, whose valuable particles are contained in a liquid that comes from a previous industrial process. To obtain said valuable particles, it is necessary to separate the liquid from the solid, obtaining on the one hand dry particles, and on the other, the evaporated liquid. For this, the liquid that contains the particles is passed through a vibrant medium which atomizes it and then passes to a dryer with hot air, where the small atomized droplets evaporate and drop the valuable particles contained in them. On the other hand, when the liquid is contaminated or has unwanted dissolved solid substances, it is passed through a vibrating medium, where the liquid is atomized and then evaporated in a dryer, dropping the unwanted particles. The evaporated phase is recovered and then passed through a condensate and obtain the purified liquid.
  • EP 0689879 discloses sprayers for medicinal applications, which usually have a spray plate similar to a hollow mirror that is vibrated together with the liquid to be sprayed. This has shown that, as a consequence of the relatively large liquid height in the spray plane, considerable energy losses appear through the reflection of the ultrasound waves in the liquid / air boundary layer. This situation is disadvantageous for rapid spraying, in particular in the formation of an aerosol with access to the lungs.
  • the invention disclosed in this document provides an ultrasound sprayer, which shows an electric piezo-ceramic and a coupling body that meets the effective union with piezo-ceramic.
  • the surface of the coupling body that comes into contact with the liquid to be sprayed is configured as a hat-shaped elevation. This ensures that the height of the liquid to be sprayed on the coupling body is not as high as it would be if the surface of the coupling body with the liquid to be sprayed were straight.
  • the invention of EP 0689879 is mainly usable in all ultrasound sprayer arrangements, in particular for medicinal application, such as for inhalation.
  • WO 2008/058941 discloses an ultrasonic liquid atomizer comprising: (a) a rigid piezoelectric transducer body comprising a first end forming an opening and a second end, the interior of the piezoelectric transducer body comprising a cavity intended to contain a liquid to be atomized, said body also presenting an axis of symmetry; (b) a microperforated membrane fixed on said first end and covering said opening; (c) a piezoelectric element adapted and arranged so as to vibrate the piezoelectric transducer body that is characterized in that the piezoelectric element is disposed towards said second end, so that the piezoelectric transducer body vibrates along a direction parallel to its axis of symmetry
  • WO9209373 discloses a device for ultrasonic fluid spraying characterized in that it comprises an electroacoustic converter, possibly at least one coupling rod element, a sprayer arranged in the form of a cantilever radial crown with respect to the axial element that supports it by construction, and tuned to the frequency of said converter, and means for causing said fluid to spray near the active zone of said sprayer.
  • EP2390010 discloses a nozzle body for an ultrasonic liquid droplet spray device, said nozzle body being arranged to receive a liquid substance from said liquid droplet spray device, comprising (a) a substrate; and (b) a plurality of through outlet nozzles formed in said substrate to eject liquid as a spray of low pressure monodispersive droplets, each through outlet nozzle being arranged to receive said liquid so that said liquid can be expelled from said nozzle body through said outlet nozzles, said outlet nozzles having straight and parallel side walls having an almost vertical profile, characterized in that said outlet nozzles are arranged in said substrate so that the Density of said outlet nozzles increases from the center towards the edges of said substrate.
  • GB 1 100535 discloses an ultrasonic atomization device, suitable for the production of emulsions from two or more substances, evaporating liquids from solids, or the addition of liquids evaporated to gases, wherein the device comprises a hollow conical nozzle in that the liquid to be atomized is fed through a tube, the nozzle pulverizes the liquid and throws it towards a vibrating plate as an objective member where said vibrating plate atomizes the sprayed liquid into small droplets, the vibrating plate being excited by a ultrasonic generator The ultrasonic generator is attached to the vibrating plate causing it to oscillate, in such a way that upon receiving the sprayed liquid from the cone-shaped nozzle, the smaller and atomized droplets are ejected in the form of a ring.
  • the vibrating plate can be circular or polygonal.
  • the present invention consists of a flat metal plate of generally rectangular or circular shape, which is vibrated in some of its own transverse vibration modes. Its most preferred application is in some high vibration mode.
  • the preferred mode is a transverse (flexional mode) or radial vibration mode, which has nodal lines and bellies in which the vibration is of the greatest amplitude in a number that is determined by the physical characteristics of the plate, namely:
  • the plate can vibrate, generating standing waves, are called the vibration mode.
  • the plate adopts a specific form given by the frequency with which it vibrates.
  • the plate vibrates with that frequency it is said that its fundamental mode of vibration has been established.
  • vibration modes the waves produce "nodes" in the plate in which the plate remains static and “bellies” in which the displacement of the plate is the maximum product of the vibration. The number of nodal lines that can be produced will depend on the dimensions of the plate and the frequency of vibration used. The design must be done in such a way that the vibration frequency produces a "perfect" vibration diagram, that is, there are no different modes from the one sought associated with the vibration form, so that there are no modes coupled to the one being used. .
  • the form of vibration must be such that just the free edge of the plate on both sides of its center has a maximum amplitude of vibration.
  • a plate (1) is shown that has a front surface (2), an upper edge (3), a lower edge (4), a right edge (5) and a left edge (6) .
  • Figure 1 shows a static plate (1) and
  • Figure 2 shows a plate vibrating in its fourth mode.
  • the plate (1) has four nodal lines (7), which are the zones where the static plate and the vibrating plate intersect, and in addition, it presents bellies (8) which are the zones of greatest amplitude of vibration of the vibrating plate, as exemplified in Figure 3.
  • the outer nodal lines (7) are used to intervene the plate without unduly disturbing the shape of vibration of the device, so that with this intervention the perforations can be made where the liquid to be sprayed enters.
  • a design was found for which the perforations made to the plate do not change the position of the nodes appreciably. From the liquid inlet, a perforation is performed perpendicular to the inlet of the latter, which aims to transport the liquid from the nodal zone (7) in which it enters to the vibration belly (8).
  • the belly (8) chosen for the output of the atomizing liquid is the closest to the inside of the plate (1). There are two more bellies but because they are at the ends of the plate they are not usable to atomize. Just in the belly (8) two oblique holes are made that allow the exit of the liquid that has been introduced through the nodal positions (7).
  • the atomization occurs due to the high level of vibration present in the vibration bellies (8) of the plate (1), area where the liquid to atomize emerges.
  • the special shape of the area in which the plate is excited should be noted.
  • the usual form of excitation of the plate would be that obtained by cutting the mechanical amplification system of the vibrator with a plane perpendicular to its axis, that is to say a circle, this is due to the cylindrical shape of the mechanical amplifier.
  • the excitation zone that is, the circle in which the mechanical amplifier intersects and the plate suffers from wear and fatigue problems.
  • the area of the corresponding circle fractures after a period of use, just in that area.
  • the design that overcomes this problem is achieved by producing a special shape at the end of the mechanical amplifier that prevents excessive stress on the plate in the excitation zone.
  • the plate is fixed to an ultrasonic transducer of a piezoelectric nature that provides sinusoidal displacements, exciting the plate through its center.
  • This design aims to apply the vibrations to the plate (1) while making the stresses be distributed over an area greater than that presented by the cross section of the mechanical amplifier.
  • the holes that are used to fix the vibrator to the plate are aligned with the belly (8) which, in an embodiment of this invention, is in the center of the plate.
  • Figure 1 shows a perspective view of a static rectangular plate.
  • Figure 2 shows a perspective view of a vibrating rectangular plate.
  • Figure 3 shows a perspective view of the intersection between a static rectangular plate and a vibrating rectangular plate.
  • Figure 4 shows a perspective view of a static rectangular plate and a rectangular plate vibrating with the perforations for the entry and exit of the liquid.
  • Figure 5 shows a front view in section with the inner channels for the entry and exit of the liquid, in one of the embodiments of the present invention.
  • Figure 6 shows a sectional side view that exemplifies the oblique channel generated by the output perforation of the atomized liquid, in one of the embodiments of the present invention.
  • Figure 7 shows an exploding perspective view of the rectangular plate and the vibrator.
  • Figure 8 shows a rear perspective view of the rectangular plate and the ultrasonic transducer attached.
  • Figure 9 shows a plan view of the rectangular plate and the ultrasonic transducer.
  • Figure 10 shows a perspective view of the mechanical amplifier that couples the plate with the ultrasonic transducer for the case of use in rectangular plates.
  • Figure 1 1 shows the coupling zone of the mechanical amplifier with the rectangular plate.
  • Figure 12 shows a front, top and bottom view of a rectangular plate with perforations for the entry and exit of liquid.
  • Figure 13 shows a front perspective view of a static rectangular plate and a rectangular plate vibrating with the perforations for the entry and exit of the liquid, wherein said perforations are located on opposite faces.
  • Figure 14 shows a rear perspective view of a static rectangular plate and a rectangular plate vibrating with the perforations for the entry and exit of the liquid, wherein said perforations are located on opposite faces.
  • Figure 15 shows a front perspective view of a static rectangular plate and its mechanical amplifier, wherein said rectangular plate has the front perforations for the sprayed liquid outlet.
  • Figure 16 shows a rear perspective view of a static rectangular plate and its mechanical amplifier, wherein said rectangular plate has the rear perforations for the entrance of the liquid to be sprayed.
  • Figure 17 shows a front perspective view of a vibrating circular plate, as a second embodiment of the present invention.
  • Figure 18 shows a rear perspective view of a vibrating circular plate, as a second embodiment of the present invention.
  • Figure 19 shows a front perspective view of a static circular plate and its mechanical amplifier, wherein said circular plate has the front perforations for the sprayed liquid outlet.
  • Figure 20 shows a rear perspective view of a static circular plate and its mechanical amplifier, wherein said circular plate has the rear perforations for the entrance of the liquid to be sprayed.
  • Figure 21 shows a top plan view in section that exemplifies the inner channel for the entry and exit of the liquid, in the form of the circular plate of the present invention.
  • the present invention relates to an atomizer formed by a vibrating plate that is excited by an ultrasonic transducer, which transforms a jet of liquid into a plurality of atomized droplets, in order to be used in industrial processes such as separation solid - liquid, which operates at large flow rates of liquids and produces more uniform atomized droplets.
  • the present invention is comprised of a rectangular plate (1) which has a thin straight rectangular parallelepiped shape, provided with a front face (2), a rear face (19), an upper edge (3) , a bottom edge (4), a right edge (5) and a left edge (6).
  • two entry perforations (9) are located on the upper edge (3), one on each side, for the entrance of the liquid to atomize.
  • two outlet perforations (10) are located to expel the atomized liquid.
  • two central perforations (14) are located which aim to fix a coupling head (16) of the mechanical amplifier (15) .
  • said coupling head (16) has perforations (20) that are coincident with the central perforations (14), the rectangular plate (1) and the coupling head (16) being joined by screws (not shown) which they fit in said perforations (14, 20).
  • the rectangular plate (1) can function smoothly with an entrance perforation (9) and an exit perforation (10)
  • two perforations (14, 20) are required in this embodiment, a good fixation could be achieved with only one central perforation (14) and one perforation (20) coinciding with the central perforation (14).
  • the perforation (9) located in one of the nodal lines (7) generates a first vertical channel (1 1) parallel to said nodal line (7) and splices with a second horizontal channel (12), which communicates towards a channel oblique (13) that ends at the exit perforation (10) located in one of the bellies (8).
  • the mechanical amplifier (15) vibrates linearly extensionally (17).
  • Said mechanical amplifier (15) is collinear with the axis of symmetry of the central belly (8) of the rectangular plate (1).
  • Said extensional vibration (17) amplified by the mechanical amplifier (15) causes the rectangular plate (1) to vibrate in a transverse direction (18), thereby generating nodal lines (7) and bellies (8).
  • the liquid that enters through the entrance perforation (9) located in one of the nodes (7) transits through the channels (1 1, 12, 13) until reaching the exit perforation (10) that is located in a pick the vibratory wave or belly (8), moving rapidly, whereby the flow of liquid is cut successively, generating a plurality of atomized drops.
  • a coupling head (16) is provided, the design of which is shown in Figures 10 and 1 1.
  • This design aims to apply the vibrations to the rectangular plate (1) while making the stresses be distributed over an area greater than that presented by the cross section of the coupling head (16).
  • the holes (20) shown in Figure 10 are intended to fix the rectangular plate (1) at the end of the coupling head (16) by means of screws (not shown).
  • the design of the coupling head (16) favors the preferred way of transverse vibration in the rectangular plate (1).
  • the relevant property of this design of the coupling head (16) is that the coupling between the rectangular plate (1) and the mechanical amplifier (15) is carried out in an area (21) of rectangular profile whose smaller sides are arcs of circumference (22).
  • a detail of the coupling area (21) is shown in Figure 1 1. This zone is where the contact between the vibrating rectangular plate (1) and the mechanical amplifier (15) that excites said rectangular plate (1) occurs, it is an area where the mechanical tensions are maximum and a mode conversion: the extensional vibrations (17) of the mechanical amplifier (15) are transformed into transverse vibrations (18) in the rectangular plate (1).
  • the coupling area (21) has a geometry similar to that produced in the vibrating rectangular plate (1) when in operation .
  • the sides (23) For the coupling area (21) shown in Figure 1 1, that which occurs at the intersection of a rectangle with an appropriate radius circumference, the sides (23) must be oriented so that they are parallel to the nodal lines. (7) of the rectangular plate (1).
  • the present invention can be carried out in any other way that allows the plate to generate nodal lines (7) and bellies (8).
  • a plate (1) is vibrating in its eighth mode.
  • the rectangular plate (1) has six entry perforations (9) located at the upper edge (3) and six entry perforations (9) located at the lower edge (4), all of them located in the nodal lines ( 7).
  • the rectangular plate (1) can function smoothly with an inlet perforation (9) and a perforation of output (10), In this way, for the invention to work, the plate can have at least one entry perforation (9) and at least one exit perforation (10).
  • the rectangular plate (1) can have a plurality of inlet perforations (9) located in a plurality of nodal lines (7) and a plurality of outlet perforations (10) located in a plurality of bellies (8), wherein said plurality of inlet perforations (9) can be located either on the upper edge (3), on the lower edge (4) or on both edges (3, 4).
  • the above-described modality is one of the preferred ones, since the liquid is entered through the edges of the rectangular plate (1) and this can facilitate its installation in some applications.
  • the entry perforations (9) can be located at any point where the nodal lines (7) pass, and in turn, the exit perforations (10) can be located at any point where the bellies (8) pass ).
  • the atomizer may be formed by a rectangular plate (1), wherein the inlet perforations (9) of the liquid to be atomized are located at mid-height of the rear face (19) on nodal lines (7) and where the outlet perforations (10) of the atomized liquid are located at half height of the front face (2) on the bellies (8).
  • Each entrance perforation (9) and each exit perforation (10) is connected by an inner channel inside the plate, which in the case of this example is oblique.
  • the plate (1) may have a circular shape, as shown in Figures 16 and 17.
  • the vibration modes are concentric to the circular plate (1), so that the head of Coupling (16) and mechanical amplifier (15) must be located in the center of it.
  • nodal lines (7) and bellies (8) are produced.
  • the inlet perforations (9) of the liquid to be atomized can be located on the rear face (19) on nodal lines (7) and where the outlet perforations (10) of the atomized liquid can be located in the front face (2) on the bellies (8).
  • Each entrance perforation (9) and each exit perforation (10) is connected by an oblique channel (13) and located radially with respect to the center of the circular plate (1).

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  • Special Spraying Apparatus (AREA)

Abstract

La présente invention concerne un atomiseur constitué d'une plaque (1) vibrante qui est excitée par un transducteur à ultrasons, lequel transforme un jet de liquide en une pluralité de gouttelettes atomisées, afin d'être utilisée dans des procédés industriels, comme par exemple de séparation solide-liquide, qui fonctionne à grands débits de liquides et produit des gouttelettes atomisées plus uniformes. Lorsque ladite plaque (1) vibre dans un de ses modes, il se produit au moins une ligne nodale (7) et au moins un ventre (8). Ledit atomiseur possède: au moins une perforation d'entrée (9) de liquide à atomiser localisé dans ladite au moins une ligne nodale (7); au moins une perforation de sortie (10) du liquide atomisé localisé dans ledit au moins un ventre (8); chaque perforation d'entrée de ladite au moins une perforation d'entrée (9) étant reliée à chaque perforation de sortie de ladite au moins une perforation de sortie (10), par l'intermédiaire d'au moins un canal (11, 12, 13) localisé à l'intérieur de ladite plaque (1); dans le ventre (8) central de la plaque (1), et dans la face postérieure (19) étant installée une tête d'accouplement (16) d'un amplificateur mécanique (15) relié au transducteur à ultrasons.
PCT/CL2015/050030 2014-08-06 2015-08-06 Atomiseur à ultrasons WO2016019479A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CL2014002079A CL2014002079A1 (es) 2014-08-06 2014-08-06 Un atomizador conformado por una placa vibrante que es excitada por un transductor ultrasonico, una linea nodal y al menos un vientre porque posee al menos una perforacion de entrada de liquido a atomizar, al menos una perforacion de salida del liquido atomizado localizada en dicho al menos un vientre.
CL2079-2014 2014-08-06

Publications (1)

Publication Number Publication Date
WO2016019479A1 true WO2016019479A1 (fr) 2016-02-11

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ID=55262965

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CL2015/050030 WO2016019479A1 (fr) 2014-08-06 2015-08-06 Atomiseur à ultrasons

Country Status (2)

Country Link
CL (1) CL2014002079A1 (fr)
WO (1) WO2016019479A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060213503A1 (en) * 2005-02-07 2006-09-28 Pari Gmbh Spezialisten Fuer Effektive Inhalation Inhalation therapy device that can be actuated in different modes
US20130079733A1 (en) * 2009-11-18 2013-03-28 Reckitt Benckiser Llc Surface Treatment Device and Method
US20140110500A1 (en) * 2011-05-16 2014-04-24 The Technology Partnership Plc. Separable membrane improvements
US20140151457A1 (en) * 2012-05-15 2014-06-05 Corinthian Ophthalmic, Inc. Ejector devices, methods, drivers, and circuits therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060213503A1 (en) * 2005-02-07 2006-09-28 Pari Gmbh Spezialisten Fuer Effektive Inhalation Inhalation therapy device that can be actuated in different modes
US20130079733A1 (en) * 2009-11-18 2013-03-28 Reckitt Benckiser Llc Surface Treatment Device and Method
US20140110500A1 (en) * 2011-05-16 2014-04-24 The Technology Partnership Plc. Separable membrane improvements
US20140151457A1 (en) * 2012-05-15 2014-06-05 Corinthian Ophthalmic, Inc. Ejector devices, methods, drivers, and circuits therefor

Also Published As

Publication number Publication date
CL2014002079A1 (es) 2016-09-16

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