EP0251524B1 - Ultraschallzerstäuber - Google Patents

Ultraschallzerstäuber Download PDF

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Publication number
EP0251524B1
EP0251524B1 EP87305111A EP87305111A EP0251524B1 EP 0251524 B1 EP0251524 B1 EP 0251524B1 EP 87305111 A EP87305111 A EP 87305111A EP 87305111 A EP87305111 A EP 87305111A EP 0251524 B1 EP0251524 B1 EP 0251524B1
Authority
EP
European Patent Office
Prior art keywords
liquid
fuel
ultrasonic atomizing
vibratory element
edged
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
EP87305111A
Other languages
English (en)
French (fr)
Other versions
EP0251524A3 (en
EP0251524A2 (de
Inventor
Hitoshi Kurokawa
Kiyoe Ishikawa
Yasuhisa Tanaka
Hiroyuki Takezi
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.)
Tonen General Sekiyu KK
Original Assignee
Tonen 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 Tonen Corp filed Critical Tonen Corp
Publication of EP0251524A2 publication Critical patent/EP0251524A2/de
Publication of EP0251524A3 publication Critical patent/EP0251524A3/en
Application granted granted Critical
Publication of EP0251524B1 publication Critical patent/EP0251524B1/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
    • 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
    • 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

Definitions

  • the present invention relates generally to an ultrasonic atomizing apparatus, and particularly to a vibrating element for use with an ultrasonic atomizing apparatus for atomizing liquid either intermittently or continuously.
  • Such an element may be effectively used with (1) automobile fuel injection devices such as electronically controlled gasoline injection valves and electronically controlled diesel fuel injection valves, (2) gas turbine fuel nozzles, (3) burners for use on industrial, commercial and domestic boilers, heating furnaces and heating devices, (4) industrial liquid atomizers such as drying atomizers for drying liquid materials such as foods, medicines, agricultural chemicals, fertilizers and the like, spray heads for controlling temperature and humidity, atomizers for calcining powders (pelletizing ceramic), spray coating devices and reaction promoting devices, and (5) liquid atomizers for uses other than industrial ones, such as spreaders for agricultural chemicals and antiseptic solution.
  • automobile fuel injection devices such as electronically controlled gasoline injection valves and electronically controlled diesel fuel injection valves, (2) gas turbine fuel nozzles, (3) burners for use on industrial, commercial and domestic boilers, heating furnaces and heating devices
  • liquid herein used is intended to mean not only liquid but also various liquid materials such as a suspension, a solution or the like.
  • the liquid is atomized by virtue of the shearing action between the liquid injected from the nozzles and the ambient air (atmospheric air). Accordingly, in order to atomize the liquid supplied, it is required to increase the liquid supply pressure, resulting in making the liquid supplying facility such as pumps, piping and the like complicated and large-sized ones.
  • regulation of the flow rate of injection is effected by varying either the pressure of the liquid supplied or the area of the nozzle injecting port.
  • the former method provides poor liquid atomization at a low flow rate (under a low pressure), as a remedy for which air or steam has additionally been used on medium-sized or large-sized boilers to aid in atomization of the liquid fuel supplied. Therefore apparatus become more and more complicated and enlarged.
  • the conventional ultrasonic liquid injection nozzle cannot be used in circumstances which require a large amount of atomized liquid because it has extremely small capacity for pulverization.
  • the present invention relates to improvements in the ultrasonic atomizing apparatus described above, and particularly to improvements in the vibrating element for use with the atomizing apparatus.
  • an object of the present invention is to provide an ultrasonic atomizing vibratory element which is capable of accomplishing satisfactorily either continuous or intermittent liquid supply.
  • Another object of the present invention is to provide an ultrasonic atomizing vibratory element which is capable of stably and effectively atomizing liquid either in a large amount or a small amount and therefore providing an extremely large turn-down ratio as well as mixing the atomized liquid with air for combustion, particularly in fuel injection nozzles for use in domestic heating boilers, gas turbines, automobiles and the like.
  • a further object of the present invention is to provide an ultrasonic atomizing vibratory element which is capable of accomplishing stable atomization without fluctuating the states of atomization (flow rate and particle size) of the supplied liquid.
  • the element of the present invention may be suitably used for a horizontally disposed combustor.
  • the present invention provides an ultrasonic atomizing vibratory element comprising an elongated shank and an edged portion which has at least one flat portion stepwise formed at the tip of the elongated shank, the flat portion of said edged portion being supplied with liquid to atomize said liquid.
  • FIG. 1 of the accompanying drawings is a fragmentary perspective view of an embodiment of an ultrasonic atomizing vibratory element in accordance with the present invention
  • FIG. 2 being a sectional view of a conventional ultrasonic atomizing apparatus which will be described in detail, by way of comparison.
  • the conventional apparatus namely, a fuel atomizer 1 for use with a kerosene heater used as a burner for a domestic heater, for example, is provided with a vibrating element 10 in a sideways position.
  • the vibrating element 10 includes a body portion 12 positioned on the right in this embodiment, an elongated, cylindrical shank 14 of the vibrating element having a diameter smaller than that of the body portion 12 and a transition portion 16 connecting the body portion 12 and the shank 14.
  • the body portion 12 is provided with an enlarged diameter flange 18 which is supported by a holder 20, and the vibrating element 10 is secured to a heater body (not shown) through the holder 20.
  • the tip of the vibrating element 10, that is, the tip on the left of the shank 14 in this embodiment is formed with an edged portion 22.
  • one or more fuel supplying pipes 30 are disposed adjacent to the edged portion 22 of the shank 14, which feed the fuel to the edged portion 22.
  • the fuel supplying pipes are supplied with the liquid fuel from a fuel supplying source (not shown) through external supplying lines (not shown).
  • the flow and flow rate of fuel are controlled by supplying valves (not shown) disposed in the external supplying lines.
  • the vibrating element 10 is continuously vibrated by an ultrasonic vibration generating means 100 operatively connected to the body portion 12. Accordingly, liquid fuel is supplied through the lines, the supplying valves and the supplying pipes 30, to the edged portion 22 where the fuel is atomized and outwardly injected.
  • the edged portion 22 of the vibrating element 1 is usually formed either with four annular steps having progressively increased diameters or with a plurality of annular steps having equal diameters as shown.
  • the atomizing apparatus having such construction operates extremely effectively.
  • the present inventors have found that the atomizing apparatus such as fuel injection nozzles for use with a boiler, a gas turbine or an automobile, and the like in which the flow rate and thus supplying speed of fuel varies in response to the running load has various drawbacks.
  • a part of the fuel may fall in drops without being fed to the edged portion, or the particle size of the liquid being pulverized may be increased.
  • Fig. 1 merely shows an edged portion 22 at the tip of the vibratory element of the atomizer.
  • the edged portion 22 of a vibrating element 10 is formed with a plurality of flat portions 24 and 26 which are stepwise formed at the tip of the vibrating element 10 (or the edged portion 22) and progressively reduced in the height of step in the direction from right to left in Fig. 1 in the present embodiment.
  • the shape of the edged portion 22 as seen in the direction indicated by arrow X is suitably a circular shape but is not limited to such a shape.
  • the edged portion is formed with two flat portions, namely a first flat portion 24 and a second flat portion 26 but the configuration of the edged portion 22 is not limited to this two step configuration and may comprise one step or more than two such steps.
  • flat portions 24 and 26 are separately formed in horizontal planes in the present embodiment, they may be formed in planes slanted in any direction other than horizontal, if desired. Furthermore, respective flat portions may be slanted in different directions.
  • a shank 14 of vibrating element 10 is formed with a groove 28 in the outer periphery of the shank 14 which groove receives fuel from a fuel supplying pipe 30.
  • the groove 28 is adapted to guide the fuel along the shank to the first stage flat portion 24.
  • the groove 28 is progressively enlarged in cross-section from an upstream portion 28 a which receives the fuel discharged out of the fuel supplying pipe 30 to a downstream portion 28 b whereat the fuel is discharged to the flat portion 24.
  • the bottom surface of the groove is inclined downwardly in the direction from the fuel receiving portion 28 a to the fuel discharging portion 28 b , to facilitate the flow of the fuel along the groove.
  • the groove may be of a U-shaped or V-shaped cross-section.
  • the fuel which is supplied to the shank 14 of the vibrating element may be guided by the groove 28 to flow efficiently to the first flat portion 24.
  • the fuel which is supplied to the first flat portion 24 may be spread over the first flat portion resulting in increasing the contacting area of the fuel and the edged portion.
  • the fuel may be atomized at the flat portion 24 and its peripheral edges.
  • the surplus fuel which is not atomized at the first flat portion 24 flows from the first flat portion to the second flat portion 26 to be again spread over the second flat portion 26 and to be atomized at the second flat portion and its peripheral edges.
  • the present invention accomplishes an increased efficiency of pulverization and cooling of supply liquid.
  • the ultrasonic atomizing vibratory element can stably and efficiently atomize either a large amount of, or a small amount of, liquid at the flat portion(s) formed in the edged portion, and resulting in providing a large turn down ratio and eliminating the problem of falling of the liquid in droplets.
  • the vibratory element of Fig. 1 can accomplish consistent liquid atomization in that there is no substantial change in the conditions of atomization (flow rate and particle size), so that particularly the vibratory element of Fig. 1 may effectively be used in a horizontal combustor.

Landscapes

  • Special Spraying Apparatus (AREA)
  • Air Humidification (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)

Claims (7)

  1. Vibratorelement (10) zur Ultraschallzerstäubung, bestehend aus einem langgestreckten Schaft (14) und einem Randteil (22), der zumindest einen ebenen Bereich (24,26) besitzt, der stufenförmig an der Spitze des langgestreckten Schaftes (14) gebildet ist, wobei dem ebenen Bereich (24,26) des Randteils (22) Flüssigkeit zugeführt wird, um die Flüssigkeit zu zerstäuben.
  2. Vibratorelement zur Ultraschallzerstäubung nach Anspruch 1, bei dem der ebene Bereich (24,26) in einer im wesentlichen horizontalen Ebene liegt.
  3. Vibratorelement (10) zur Ultraschallzerstäubung nach Anspruch 1 oder Anspruch 2, bei dem der Schaft (14) mit einer Nut (28) zum Führen der Flüssigkeit zu dem ebenen Bereich (24,26) des Randteils (22) versehen ist.
  4. Vibratorelement zur Ultraschallzerstäubung nach Anspruch 3, bei dem die Nut (28) fortschreitend im Querschnitt in Richtung von einem Bereich (28a) zur Aufnahme der Flüssigkeit zu einem Bereich (28b) zur Abgabe der Flüssigkeit an den ebenen Bereich (24) erweitert und die Bodenfläche der Nut (28) in Richtung vom Flüssigkeitsaufnahmebereich zum Flüssigkeitsabgabebereich nach unten geneigt ist.
  5. Vibratorelement zur Ultraschallzerstäubung nach einem der vorhergehenden Ansprüche, bei dem der Randteil (22) mehr als eine Stufe (24,26) umfaßt.
  6. Vibratorelement zur Ultraschallzerstäubung nach Anspruch 5, bei dem die Stufen (24,26) beide in horizontalen Ebenen liegen.
  7. Vibratorelement zur Ultraschallzerstäubung nach Anspruch 5, bei dem die Stufen (24,26) in einander schneidenden Ebenen liegen.
EP87305111A 1986-06-27 1987-06-10 Ultraschallzerstäuber Expired - Lifetime EP0251524B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1986097790U JPS636074U (de) 1986-06-27 1986-06-27
JP97790/86 1986-06-27

Publications (3)

Publication Number Publication Date
EP0251524A2 EP0251524A2 (de) 1988-01-07
EP0251524A3 EP0251524A3 (en) 1989-03-08
EP0251524B1 true EP0251524B1 (de) 1992-03-18

Family

ID=14201607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87305111A Expired - Lifetime EP0251524B1 (de) 1986-06-27 1987-06-10 Ultraschallzerstäuber

Country Status (4)

Country Link
EP (1) EP0251524B1 (de)
JP (1) JPS636074U (de)
KR (1) KR880000148A (de)
DE (1) DE3777467D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6450417B1 (en) 1995-12-21 2002-09-17 Kimberly-Clark Worldwide Inc. Ultrasonic liquid fuel injection apparatus and method
US6543700B2 (en) 2000-12-11 2003-04-08 Kimberly-Clark Worldwide, Inc. Ultrasonic unitized fuel injector with ceramic valve body
US6663027B2 (en) 2000-12-11 2003-12-16 Kimberly-Clark Worldwide, Inc. Unitized injector modified for ultrasonically stimulated operation

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6020277A (en) * 1994-06-23 2000-02-01 Kimberly-Clark Corporation Polymeric strands with enhanced tensile strength, nonwoven webs including such strands, and methods for making same
US6053424A (en) * 1995-12-21 2000-04-25 Kimberly-Clark Worldwide, Inc. Apparatus and method for ultrasonically producing a spray of liquid
US5801106A (en) * 1996-05-10 1998-09-01 Kimberly-Clark Worldwide, Inc. Polymeric strands with high surface area or altered surface properties
DE10327430A1 (de) * 2003-06-18 2005-01-05 Abb Patent Gmbh Ultraschall-Stehwellen-Zerstäuberanordnung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60222552A (ja) * 1984-04-19 1985-11-07 Toa Nenryo Kogyo Kk 超音波噴射方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6450417B1 (en) 1995-12-21 2002-09-17 Kimberly-Clark Worldwide Inc. Ultrasonic liquid fuel injection apparatus and method
US6659365B2 (en) 1995-12-21 2003-12-09 Kimberly-Clark Worldwide, Inc. Ultrasonic liquid fuel injection apparatus and method
US6543700B2 (en) 2000-12-11 2003-04-08 Kimberly-Clark Worldwide, Inc. Ultrasonic unitized fuel injector with ceramic valve body
US6663027B2 (en) 2000-12-11 2003-12-16 Kimberly-Clark Worldwide, Inc. Unitized injector modified for ultrasonically stimulated operation

Also Published As

Publication number Publication date
EP0251524A3 (en) 1989-03-08
EP0251524A2 (de) 1988-01-07
KR880000148A (ko) 1988-03-23
DE3777467D1 (de) 1992-04-23
JPS636074U (de) 1988-01-16

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