US3285517A - Ultrasonic atomiser - Google Patents

Ultrasonic atomiser Download PDF

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Publication number
US3285517A
US3285517A US439358A US43935865A US3285517A US 3285517 A US3285517 A US 3285517A US 439358 A US439358 A US 439358A US 43935865 A US43935865 A US 43935865A US 3285517 A US3285517 A US 3285517A
Authority
US
United States
Prior art keywords
limb
sleeve
face
sleeve member
transformer
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
US439358A
Other languages
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
Original Assignee
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 US3285517A publication Critical patent/US3285517A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F23D11/345—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by ultrasonic means 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
    • 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

Definitions

  • the invention relates to an ultrasonic atomiser, more particularly to a liquid fuel atomiser for boilers.
  • the ultrasonic fuel atomiser comprises an electromechanical energy transducer, a velocity transformer for stepping up the velocity, having a larger limb 'being in acoustical and mechanical contact with the transducer and a sleeve surrounding a thinner limb of the transformer with a clearance space therebetween, and means for injecting the fuel to be atomised into the clearance space between the thinner limb and the sleeve in order to cause the liquid to flow along the thinner limb towards the free end face thereof.
  • the invention is characterized in that the sleeve consists of, or the inner wall of the sleeve is lined with, an acoustically absorbing material.
  • the sleeve has preferably a smaller length than the transformer limb surrounded thereby and the absorbing material preferably consists of an expanded, synthetic material, for example foam rubber having a closed cell structure.
  • FIG. 1 is a side elevation and partly a sectional view of an ultrasonic fuel atomiser and FIG. 2 is a front view of the device of FIG. 1.
  • the electromechanical transducer 1 is of the magnetostrictive type, which is in mechanical and acoustical contact with the thicker limb 2 of a cylindrical step-up velocity transformer, tuned to the vibrations and having a thinner limb 3, the free end of which has a substantially semi-hemispherical shape.
  • the limb 3 is surrounded by a sleeve 4, which has, in the embodiment shown, a flange-shaped end 5 and is secured in a liquid-tight manner to the radial head face of the transformer limb 2 by means of screws 6.
  • the front end of the sleeve 4 is provided with a mouth 7, the central opening of which has a given clearance X (FIG. 2) with respect to the limb 3.
  • Liquid, for example oil is supplied through a pipe 8 adjacent the rear side of the sleeve 4 near the thicker limb 2, so that the limb 3 is washed by liquid.
  • the thick- "ice ness (Y) of the mouth 7 may be chosen so that at the non-supported end the sleeve 4 has sufiicient rigidity and the length of the sleeve together with the mouth 7 is preferably such that a distance Z between the mouth 7 and the centre of curvature of the hemispherical end of the limb 3 is obtained. It has been found that in this Way the mouth does not affect the atomized liquid at high flow rates.
  • the construction described above may be materially improved by making the sleeve 4 from acoustically, absorbing material or by providing a lining in the sleeve 4 of said material.
  • Suitable materials are for example foam polystyrene, foam neoprene or natural or synthetic rubber of closed cell structure. From experiments it has been found that by using an absorbing lining the ultrasonic useful effect is improved by 30% and the noise is reduced. It has furthermore been found that a greater uniformity in droplet size is obtained.
  • the lining reduces the formation of bubbles in the liquid within the space between the limb 3 and the sleeve 4, while noise absorption and scattering characteristics thereof suppress the effect of standing waves. In this way it can be ensured that the liquid flows in a more homogeneous stream to the vibrating hemispherical end face of the limb 3. Moreover, the spherical end of the limb 3 exhibits a greater movement of vibration excursion than the sleeve 4, since the latter is connected with a portion of the limb 2 of a larger diameter than the limb 3, so that it is subjected to a less great velocity transformation.
  • the transducer may for example be a piezoelectric transducer and the velocity transformer may be constructed as a substantially exponential transformer instead of forming a step-up transformer.
  • the vibrating end face need not be accurately hemispherical.
  • An ultrasonic liquid atomizer comprising an electromechanical energy transducer means, a velocity transformer having one end coupled with said transducer means, said transformer having an output limb defining a free end face, a sleeve member, means supporting said sleeve member for surrounding said output limb and defining a clearance space there between, means in said sleeve remote from the free end face of said output limb for admitting a liquid to be atomized into said clearance space, said sleeve member having an acoustical absorbing material defining said clearance space with said output limb, and said free end face of said output limb projecting beyond said sleeve member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Special Spraying Apparatus (AREA)
US439358A 1964-03-25 1965-03-12 Ultrasonic atomiser Expired - Lifetime US3285517A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB12611/64A GB1039903A (en) 1964-03-25 1964-03-25 Improvements in or relating to ultrasonic atomisers

Publications (1)

Publication Number Publication Date
US3285517A true US3285517A (en) 1966-11-15

Family

ID=10007843

Family Applications (1)

Application Number Title Priority Date Filing Date
US439358A Expired - Lifetime US3285517A (en) 1964-03-25 1965-03-12 Ultrasonic atomiser

Country Status (6)

Country Link
US (1) US3285517A (de)
AT (1) AT248587B (de)
BE (1) BE661560A (de)
CH (1) CH425664A (de)
GB (1) GB1039903A (de)
NL (1) NL6503475A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4301968A (en) * 1976-11-08 1981-11-24 Sono-Tek Corporation Transducer assembly, ultrasonic atomizer and fuel burner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3145931A (en) * 1959-02-27 1964-08-25 Babcock & Wilcox Ltd Liquid atomizers generating heat at variable rate through the combustion of liquid fuel

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3145931A (en) * 1959-02-27 1964-08-25 Babcock & Wilcox Ltd Liquid atomizers generating heat at variable rate through the combustion of liquid fuel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4301968A (en) * 1976-11-08 1981-11-24 Sono-Tek Corporation Transducer assembly, ultrasonic atomizer and fuel burner

Also Published As

Publication number Publication date
AT248587B (de) 1966-08-10
NL6503475A (de) 1965-09-27
BE661560A (de) 1965-09-24
CH425664A (de) 1966-11-30
GB1039903A (en) 1966-08-24

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