US3375977A - Ultrasonic atomiser - Google Patents

Ultrasonic atomiser Download PDF

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Publication number
US3375977A
US3375977A US439359A US43935965A US3375977A US 3375977 A US3375977 A US 3375977A US 439359 A US439359 A US 439359A US 43935965 A US43935965 A US 43935965A US 3375977 A US3375977 A US 3375977A
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US
United States
Prior art keywords
face
liquid
limb
transformer
liquids
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.)
Expired - Lifetime
Application number
US439359A
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English (en)
Inventor
Butterworth Harold Millman
Neppiras Ernest Arthur
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.)
US Philips Corp
North American Philips Co Inc
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US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3375977A publication Critical patent/US3375977A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/34—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by ultrasonic means or other kinds of vibrations
    • F23D11/345—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by ultrasonic means or other kinds of vibrations with vibrating atomiser surfaces
    • 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
    • B05B17/0623—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 coupled with a vibrating horn
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M27/00—Apparatus for treating combustion-air, fuel, or fuel-air mixture, by catalysts, electric means, magnetism, rays, sound waves, or the like
    • F02M27/08—Apparatus for treating combustion-air, fuel, or fuel-air mixture, by catalysts, electric means, magnetism, rays, sound waves, or the like by sonic or ultrasonic waves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/07—Nozzles and injectors with controllable fuel supply

Definitions

  • the ultrasonic atomiser comprises an electromechanical transducer which is in acoustic and mechanical contact with a velocity transformer formed by a body of revolution with a free vibrating end face, and means for feeding the liquid to be atomised to said face in the form of a thin skin applied to said face and is characterized in that the end face has the shape of a curved surface smoothly joining the velocity transformer, the radius of curvature of said face being initially at least equal to the radius of the velocity tranformer, where it terminates in the curved surface.
  • the shape of the vibrating free end or face of the velocity transformer, to which the liq uid is fed has a marked effect on the atomising efliciency, as well as the manner in which the liquid is fed to said free face.
  • the vibrating end face of the velocity transformer is substantially hemispherical, or semi-hemispherical, the liquid being fed to said face so that a thin skin or film is formed thereon.
  • the vibrating face must have, in a longitudinal cross section, a more or less ogival form, so that the tangent to the ogive surface is, at any point, at a negative angle of inclination to the axis of revolution of the rotation-symmetrical surface of the ogive.
  • FIG. 1 shows diagrammatically a velocity transformer with a vibrating end surface of a given shape.
  • FIG. 2 shows a modified form of the end surface to a larger scale and FIG. 3 shows a still further modified form of the end surface.
  • FIG. 1 shows diagrammatically a portion of a stepped cylindrical velocity transformer 1, having an input limb 2 and an output limb 3 of smaller diameter.
  • the transformer is driven by an ultrasonic transducer (not shown) of any suitable known type, for example a nragnetostriction transducer.
  • the liquid to be atomised is fed to the vibrating end of the limb 3 by a plurality of feed pipes 4, 5, the open ends of which terminate closely adjacent the surface of the limb.
  • the free end 10 of the limb 3, as is shown in the drawing, has more or less an ogival form for liquids of low viscosity, i.e. less than 10 centipoise, while the cylindrical portion of the limb 3 terminates smoothly with the curved surface of the ogive.
  • the radius of curvature of the ogive has a value approximately equal to twice the radius of the cylindrical portion.
  • the feed pipes are arranged so as to deliver the liquid to be atomised to the limb at the start of the curved end portion i.e. where the ogive meets the cylindrical portion of the: limb 3.
  • the curvature of the vibrating end surface 10 of limb 3 of the transformer in order to obtain an effective atomisation, de pends upon the viscosity of the liquid and upon the quantity of acoustical energy of the said surface.
  • the angle between the tangent to the curved surface of the free end at any point and the axis of revolution of the transformer determines (in accordance with the thickness of the liquid layer) the extent of transfer of energy to the liquid in the various stages of vibration and the radius of curvature of the curved surface determines the thickness of the liquid layer. More viscous liquids require much more acoustic energy and hence for rapid transfer of energy to the liquid the initial curvature must be: greater.
  • FIG. 2 shows to a larger scale a modified form of the end surface suitable for liquids of between 10 and 20 cp. of viscosity.
  • the smaller initial radius of curvature of the surface can lead to the existence of regions which can trap droplets and disrupt flow.
  • the shape of the surface towards the axis is modified, so that a pip 20 is formed at the extremity. Near the pip there is thus obtained a point of inflection in the axial sectional view shown. More particularly, the ogive is defined by a conoidal concave surface 20 which is faired into the surface of a convex frusto-conical portion 10 of the end surface; wherein the surface 10 is contiguous with and in faired relation to the cylindrical body section 3.
  • the conoidal concave surface 20 provides the inflection point or pip.
  • the flared end 30 of the limb 3 results in more complete atomisation, any remaining droplets being blended into the rest of the atomised spray.
  • the ogive 3 of FIG. 3 is defined by the surface of a convex frustoconical portion 10, which is contiguous with the cylindrical body 3, and a substantially cylindrical portion 30 having a concave surface. The surfaces of convex portion and concave portion 30 are in faired relationship.
  • the limb 3 of the device of FIG. 1 has a diameter of 3.5 mms. and the curved portion 10 has a length in the axial direction of 2.5 mms. With FIG. 2 these dimensions were 8.8 and 6.5 mms. respectively and with FIG. 3 12.5 and 8.8 rnms. respectively.
  • the liquid to be atomised may be fed to the vibrating end surface of the velocity transformer through an annular opening at the end of a pair of substantially coaxial feed pipes.
  • the liquid feed pipes or the annular opening may be provided with (a) mouth piece(s) so that one or a plurality of liquid jets are obtained.
  • An apparatus for ultrasonic atomization of liquids comprising, a velocity transform-er having a cylindrical body portion terminating in a free end face, said end face having an ogival shape fairing into said body portion and means adjacent said cylindrical body for applying a thin film of liquid to the surface of said free end face whereby vibration of said free end face will atomize said liquid film.
  • said means for feeding a thin film comprises a 4,. plurality of nozzles radially spaced about said body portion and directed toward said ogival end face remote from the apex of said ogive.
  • said ogival end face is defined by a conoidal concave surface which is in faired relation to a convex frusto-conical surface, said convex surface is in faired relation to said cylindrical body portion and the apex of said concave surface provides an inflection point.
  • said end face is defined by a convex frusto-conical surface which is contiguous with and in faired relation to said cylindrical body portion, said convex surface converging into a substantially cylindrical portion having a concave surface, with said surfaces being in faired relation.
US439359A 1964-03-25 1965-03-12 Ultrasonic atomiser Expired - Lifetime US3375977A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1261364 1964-03-25

Publications (1)

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US3375977A true US3375977A (en) 1968-04-02

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US439359A Expired - Lifetime US3375977A (en) 1964-03-25 1965-03-12 Ultrasonic atomiser

Country Status (5)

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US (1) US3375977A (xx)
AT (1) AT248588B (xx)
BE (1) BE661561A (xx)
CH (1) CH425665A (xx)
NL (1) NL6503476A (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3648929A (en) * 1971-02-08 1972-03-14 Battelle Memorial Institute Atomizer
US3907940A (en) * 1970-09-25 1975-09-23 Arthur K Thatcher Sonic carburetor system
US3908904A (en) * 1972-10-14 1975-09-30 Davy Powergas Gmbh Ultrasonic atomizer for waste sulfuric acid and use thereof in acid cracking furnaces
US4085893A (en) * 1974-03-20 1978-04-25 Durley Iii Benton A Ultrasonic humidifiers, atomizers and the like
US4520786A (en) * 1980-02-04 1985-06-04 Arthur K. Thatcher Revokable Trust Sonic dispersion unit and control system therefor
EP0202101A1 (en) * 1985-05-13 1986-11-20 Toa Nenryo Kogyo Kabushiki Kaisha Vibrating element for ultrasonic atomization
US4674286A (en) * 1972-09-29 1987-06-23 Arthur K. Thatcher Sonic dispersion unit and control system therefor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6338193A (ja) * 1986-08-01 1988-02-18 Toa Nenryo Kogyo Kk 超音波振動子ホ−ン

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2908443A (en) * 1949-06-07 1959-10-13 Fruengel Frank Ultrasonic carburetor
US2949900A (en) * 1958-06-02 1960-08-23 Albert G Bodine Sonic liquid sprayer
US3019661A (en) * 1956-04-26 1962-02-06 Gulton Ind Inc Ultrasonic transducer and impedance matching device therefor
US3114654A (en) * 1959-12-14 1963-12-17 Hitachi Ltd Electrostiatic coating apparatus employing supersonic vibrations
US3145931A (en) * 1959-02-27 1964-08-25 Babcock & Wilcox Ltd Liquid atomizers generating heat at variable rate through the combustion of liquid fuel
US3155141A (en) * 1962-06-18 1964-11-03 Little Inc A Apparatus for atomizing and burning a liquid fuel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2908443A (en) * 1949-06-07 1959-10-13 Fruengel Frank Ultrasonic carburetor
US3019661A (en) * 1956-04-26 1962-02-06 Gulton Ind Inc Ultrasonic transducer and impedance matching device therefor
US2949900A (en) * 1958-06-02 1960-08-23 Albert G Bodine Sonic liquid sprayer
US3145931A (en) * 1959-02-27 1964-08-25 Babcock & Wilcox Ltd Liquid atomizers generating heat at variable rate through the combustion of liquid fuel
US3114654A (en) * 1959-12-14 1963-12-17 Hitachi Ltd Electrostiatic coating apparatus employing supersonic vibrations
US3155141A (en) * 1962-06-18 1964-11-03 Little Inc A Apparatus for atomizing and burning a liquid fuel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907940A (en) * 1970-09-25 1975-09-23 Arthur K Thatcher Sonic carburetor system
US3648929A (en) * 1971-02-08 1972-03-14 Battelle Memorial Institute Atomizer
US4674286A (en) * 1972-09-29 1987-06-23 Arthur K. Thatcher Sonic dispersion unit and control system therefor
US3908904A (en) * 1972-10-14 1975-09-30 Davy Powergas Gmbh Ultrasonic atomizer for waste sulfuric acid and use thereof in acid cracking furnaces
US4085893A (en) * 1974-03-20 1978-04-25 Durley Iii Benton A Ultrasonic humidifiers, atomizers and the like
US4520786A (en) * 1980-02-04 1985-06-04 Arthur K. Thatcher Revokable Trust Sonic dispersion unit and control system therefor
EP0202101A1 (en) * 1985-05-13 1986-11-20 Toa Nenryo Kogyo Kabushiki Kaisha Vibrating element for ultrasonic atomization

Also Published As

Publication number Publication date
NL6503476A (xx) 1965-09-27
CH425665A (de) 1966-11-30
AT248588B (de) 1966-08-10
BE661561A (xx)

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