EP0029941B1 - Ultraschall-Zerstäuber für Flüssigkeiten - Google Patents

Ultraschall-Zerstäuber für Flüssigkeiten Download PDF

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Publication number
EP0029941B1
EP0029941B1 EP80106972A EP80106972A EP0029941B1 EP 0029941 B1 EP0029941 B1 EP 0029941B1 EP 80106972 A EP80106972 A EP 80106972A EP 80106972 A EP80106972 A EP 80106972A EP 0029941 B1 EP0029941 B1 EP 0029941B1
Authority
EP
European Patent Office
Prior art keywords
section
atomizing
tubular member
ultrasonic
atomizer according
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
Application number
EP80106972A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0029941A1 (de
Inventor
Harvey L. Berger
Charles R. Brandow
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.)
Sono Tek Corp
Original Assignee
Sono Tek 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 Sono Tek Corp filed Critical Sono Tek Corp
Priority to AT80106972T priority Critical patent/ATE12541T1/de
Publication of EP0029941A1 publication Critical patent/EP0029941A1/de
Application granted granted Critical
Publication of EP0029941B1 publication Critical patent/EP0029941B1/de
Expired 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
    • B05B17/063—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 having an internal channel for supplying the liquid or other fluent material
    • 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
    • F23D11/34—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

Definitions

  • the invention relates to an ultrasonic atomizer for liquids with an atomizer section with an atomizer surface and an ultrasound driver coupled therewith and an axially penetrating the atomizer section and the ultrasound driver, after the atomizer surface leading bore for receiving a tubular part for the supply of liquid after the atomizer surface, as described, for example, in US Pat. No. 4,153,201 in accordance with DE-A 2,749,859 or also DE-A 2,734,818.
  • DE-A 2 749 859 discloses a radially extending feed line in the atomizer section via which the liquid, i.e. for example the fuel to which atomizers are supplied.
  • connection pipe and, for example, nipples are required to connect the atomizer to the supply pipe for the liquid, which are required for coupling the radially extending supply line to the fuel supply line. If these parts are assembled correctly, the connection lines and nipples can provide a satisfactory connection of the atomizer to the fuel supply line.
  • These connections between the nipples and the connecting line, the fuel supply in the atomizer section and the fuel supply line tend to leak. In addition, making all of these connections and verifying that they are all leak tight is very time consuming and cumbersome.
  • an atomizer of this type is used as a fuel atomizer in a household as an oil burner, then the atomizer can be carried by the jet pipe itself.
  • the atomizer described in the above-mentioned DE-A-2 749 859 is screwed onto the jet pipe.
  • An annular flange with retaining spiders is attached to the atomizer, and the screws connect the flange to the spray lance, which is spaced accordingly by the retaining spiders.
  • an ultrasonic atomizer is also known, in which a coaxial arrangement of the fuel pipe with the nozzle section and on the other hand a fuel pipe inserted laterally into the atomizer section are disclosed.
  • An elastic ring is provided for decoupling the fuel tube from the oscillating atomizer section.
  • an elastic damping ring is arranged between the housing and the atomizing section.
  • the object on which the invention is based can thus be seen in improving such an ultrasonic atomizer for liquids in such a way that the liquid or fuel supply after the atomizer and after the atomizer surface is improved by means of an improved coupling to the fuel supply line in that the fuel supply line itself Carries ultrasonic atomizer.
  • the aim of this is to prevent premature atomization of the liquid in the fuel supply line after the atomizing surface of the ultrasonic atomizer.
  • tubular part is inserted at one end into the axially extending bore for the supply of liquid to the surface of the dusting device and that means are provided for fastening the tubular part to the atomizing section, and also in a radially outward direction directed distance from the axially extending bore fasteners for coupling the ultrasonic driver to the atomizer section are provided.
  • This object can also be achieved in that a decoupling sleeve extending rearward from the atomizer surface is provided in this axially extending bore, that the tubular part is mounted in this axially extending bore and extends backwards from the decoupling sleeve and is connected to it and that means are provided for fastening the decoupling sleeve and the tubular part to the atomizing section and further fastening means for coupling the ultrasound driver to the atomizing section.
  • the fuel line consists of a tubular member that extends at least partially within the bore, with means being provided to receive this tubular member.
  • the tubular part is formed by the fuel supply line, which extends into the axially extending bore and supports the atomizer.
  • the tubular part can contain connection means for connecting the tubular part to a fuel supply, or, as already mentioned, the tubular part can be part of the fuel supply line.
  • means are provided for an improved coupling of the tubular part or the fuel supply line to the atomizer and / or an improved coupling of the atomizer section to the driver for the atomizer. This also further improves the operating behavior of the atomizer.
  • the tubular part (fuel supply line) is preferably provided with an external thread, while the atomizer has an internal thread into which the tubular part can be screwed.
  • the tubular part or the fuel supply line is therefore in front preferably connected to the atomizer via a screw connection.
  • This screw connection is sealed with a sealant, which prevents fuel from escaping after the driver.
  • the threaded section in the nebulizer for receiving the tubular member begins at the beginning of the outlet section or begins a small distance within this outlet section and extends in the outlet section towards the atomizer surface.
  • the tubular part forms part of the fuel supply line, which has a threaded section at a distance from its end and a decoupling collar at that end of the threaded section which extends towards or close to the atomizer surface.
  • the tubular part or the fuel supply line is provided with a thread or threaded section which can be screwed into the front section of the atomizer and contains means which can be used by other means in or on the rear section of the atomizer in the vicinity of the driver in the Interact so that the rear and front sections are contracted when the tubular member or the fuel supply line is in the front section. of the atomizer is screwed in.
  • a metallic decoupling sleeve which premature Zerstäu: bung prevents fluid in the line leading to the atomizing surface in an ultrasonic liquid line.
  • a metal tube extends into the axial bore from one end of the ultrasonic nebulizer to the nebulizer surface, a portion of this tube forming the decoupling sleeve.
  • the tubular member described above and the decoupling sleeve are integrally formed from a metal pipe.
  • the one-piece metal tube is formed by the fuel supply line and includes an annular flange that can engage the annular flange in the rear portion of the atomizer.
  • a liquid atomization transducer which consists of an atomizer section with an atomizer surface, an ultrasound driver in the vicinity of the atomizer section, both of which are penetrated by a bore extending axially after the atomizer surface, and means for the coupling of the driver with the atomizer section for atomizing a liquid supplied to the atomizer surface through the axially extending bore, depending on the electrical excitation of the driver.
  • the driver can consist of one or more piezoelectric elements. 1
  • the transducer used here has a front ultrasonic horn section, a rear ultrasonic horn section and a driver with at least one piezoelectric disk which is embedded between the two ultrasonic sections, and with means for clamping the front and rear ultrasonic horn sections with the driver, and with an output section which extends from the front ultrasonic horn section and ends in an atomizer surface.
  • a bore is provided which extends axially through the front section, the rear section and the driver element to the atomizing surface, the bore extending axially from the end of the rear section through the driver element and the front section to the end of the front section.
  • the transducer assembly can also include a symmetrical double ultrasonic horn that includes a driver element.
  • the tubular member extends through the driver, the end of the tubular member being in or near the atomizer section or the outlet section.
  • the driver of the output section includes an electrode and one or more driver elements, all of which have a bore through which the tubular member extends. Means are provided for isolating the electrode and the driver elements from the tubular part. Preferably, the end of the tubular part is screwed into or near the atomizer section or the exit section.
  • the driver consists of a pair of annular piezoelectric elements which are arranged on both sides of an annular electrode.
  • the diameter of the electrode is reduced, which results in a free space beyond the circumference of the electrode for fastening means, such as screws or bolts, which have previously been passed through the electrode.
  • the screws or bolts extend between the sections of the atomizer and couple the driver to the atomizer.
  • the free space formed by the reduced diameter of the electrode makes it unnecessary to isolate the screws or bolts from the electrode.
  • the diameter of the piezoelectric element is smaller than the diameter of the electrode, and a ring or sleeve of insulating material is wrapped around the driver elements in the vicinity of the electrode, the outer diameter of the ring being approximately equal to the outer diameter of the electrode .
  • the ring-shaped piezoelectric elements are centered by the axial bore, whereby further centering by circular recesses in the surfaces of the atomizer opposite the driver elements is unnecessary.
  • the tubular part that may be formed by the fuel supply line and the decoupling sleeve, which may also be part of the fuel supply line, may be made of acoustically mismatched materials with respect to the atomizer.
  • acoustically mismatched materials such as copper, steel and the like can be used with aluminum.
  • aluminum itself can be used for the manufacture of the tubular part or the fuel supply line and the decoupling sleeve.
  • Conventional atomizing fuel burners contain a jet pipe to which the fuel is supplied and from which the atomized fuel / air mixture is released.
  • Such conventional burners have the shape shown in FIG. 1.
  • the fuel line of such a household burner normally contains a steel fuel pipe 11 with a diameter of 3/8 ", which is at the rear end of the jet pipe housing 10 enters and extends along the central axis of the jet pipe housing and ends in a nozzle 12 which is located at or near a swirl plate 13 at the front end of the jet pipe housing.
  • heating oil is fed into the atomizer section 16 of an atomizer 17 through a through-bore 18 extending in the radial direction.
  • the radial bore 18 is connected to an axially extending passage 20 which leads to the atomizer surface 22.
  • a connecting hose 24 and fuel nipples 26, 28 can be used for connecting the atomizer 17 to a fuel line, e.g. line 11 in FIG. 1, or a similar fuel line 11a in FIG. 2, a connecting hose 24 and fuel nipples 26, 28 can be used.
  • the fuel tube 11 a in Fig. 2 is closed at its front end 30 with a plate or cap 32 or other suitable means.
  • the plate or cap 32 can, for example, be screwed on or fastened by means of an adhesive.
  • a bore is made in the tube 11a near the end 30 and a nipple 26 is inserted.
  • the nipple 28 is mounted in the radially extending bore 18.
  • the connecting tube 24, which can be, for example, a flexible plastic hose, is connected to the two nipples and thus establishes the connection between the fuel line and the atomizer.
  • the nipples are normally screwed into the nebulizer and fuel line, and the tubing 24 is snugly fitted over the nipples.
  • the hose can also be attached to the nipples using hose clamps.
  • the ultrasonic atomizer 17 is attached to the front end 34 of the jet pipe by means of an annular fastening plate 36, which has mounting spiders 37, which in turn distance the plate 34 and the atomizer from ensures the front end 22 of the jet pipe.
  • the jet tube housing 10a is in turn attached to the oil burner in the usual way.
  • connection of the fuel line 11 to the ultrasonic atomizer 17 according to FIG. 2 has various disadvantages. With each connection between the fuel line 11 and the radially extending bore 18, there is the possibility that fuel or oil will leak at leaks.
  • the connection between nipple 26 and fuel line 11a, the connection between hose 24 and nipple 26, the connection between hose 24 and nipple 28 and the connection between nipple 28 and the radial line or bore 1.8 are all places where leaks can occur.
  • the ultrasonic atomizer must be attached to the housing of the jet pipe, which means such as e.g. the ring-shaped plate, which requires assembly spiders and the screws or bolts.
  • the burner shown in FIG. 2 generally includes solid driver elements 40, 42 embedded between front and rear horn-like sections 46 and 44.
  • An electrode 48 lies between the driver elements 40 and 42.
  • the driver elements 40, 42 and the electrode 48 are disk-shaped, and the horn sections 44, 46, the driver elements 40, 42 and the electrode 48 are held together by means of screws which are passed through the driver elements and the electrodes extend therethrough, means being provided which isolate the screws from the electrode.
  • the fuel line itself (FIGS. 3, 4 and 7) or a tube connected to the fuel line (FIG. 5) is inserted axially into the atomizer and extends in the axial direction through the rear section, the driver elements and the Electrode after the front section.
  • the rear section 50 is provided with an axially extending bore 52.
  • the driver elements 54, 56 and the electrode 55 are ring-shaped, i.e. they are in the form of washers with a central hole.
  • the front portion 58 has an axially internally threaded bore 60 which communicates with the axially extending bore 20a which leads to the atomizing surface 22a in the atomizer portion 16a.
  • the axially extending bores in the rear section, in the front section and in the atomizer and the holes in the driver elements and the electrode are axially aligned with one another and form a fuel line, generally designated 62, which extends from the rear end to after the atomizer surface.
  • the relative diameters of the individual bores and openings that total the axially extending bore 62 in Figs. 3 to 5 form are shown in Fig. 6.
  • the rear section 50 has a central bore 52 with a diameter a.
  • the center bores 64 and 66 of the driver elements have a diameter b, adjoining the ends 56a and 54a of the driver elements, and a diameter a in between.
  • the central bore 65 in the electrode 55 has the diameter b, and the front section contains a threaded bore 60 with a diameter c directly next to the driver elements, which is connected to a central bore 20a with a diameter d in the atomizer section 16a.
  • the threaded bore 60 receives the threaded end 68 of a connecting line 70 (FIG. 5) or the end 69 of the fuel line itself (FIGS. 3 and 4).
  • the fuel line 11b (FIG.
  • connection line 70 extends through the bore 52 in the rear section 50, through the bores 64 and 66 in the driver elements and the electrode, and in the front section 58.
  • the end 68 of the connection line 70 or the fuel line 69 is screwed into the threaded portion 60, and a sealant or sealant is provided in the connection to ensure that no oil leaks.
  • the fuel line 11b has a threaded section 69 which is screwed into the threaded section 60 in the front section 58.
  • a decoupling sleeve 71 made of polytetrafluoroethylene or according to the invention, as shown in Fig. 3, made of another suitable material, e.g. Aluminum, steel, copper, etc. is inserted into the bore 20a and extends to just before the opening in the surface 22a.
  • the decoupling sleeve 71 has a threaded end section 72 which is screwed into the threaded section 60 in the front section 58 of the atomizer.
  • the fuel line 11 c has a section 73 with a reduced diameter, which extends from the threaded section 69 a.
  • the section 73 with a reduced diameter represents the decoupling sleeve 72 and is made of the same material as the fuel line 11c. If the decoupling sleeve is designed as part of the fuel line 11c, an absolutely tight line is obtained after the atomizer. If such a metal fuel line with a decoupling sleeve is used instead of a decoupling sleeve made of polytetrafluoroethylene, this avoids the use of plastic parts in the vicinity of possibly very high temperatures. In addition, the manufacture of one-piece parts is simplified.
  • the diameter of the part of the fuel line which accommodates the decoupling sleeve 71 is selected such that it lies slightly inside the fuel bore 20a within the front section 58. This, however, avoids a press fit which could otherwise possibly exert a pressure, which worsens the Can result in operational behavior. In addition, this avoids the possibility of an acoustic coupling between the fuel line and the front section, but this could occur with a press fit.
  • a tubular member may be screwed into the atomizer and the end 74 of the tubular member is then connected to the fuel line 11a.
  • the tubular member 70 may be connected to the fuel line 11a by a sleeve or coupling 76.
  • 5 uses a normal decoupling sleeve 77 made of polytetrafluoroethylene.
  • FIG. 7 an atomizer similar to that in Fig. 4 is shown, in which the fuel line 11d has an annular flange or shoulder 90 spaced from the threaded portion 69, the rear portion 50a also having an annular flange or one Shoulder 92 is provided, which immediately adjoins the driver.
  • the flanges 90 and 92 engage each other when the fuel line 11d is screwed onto the threaded portion 60, thereby pulling the front portion 58 and the rear portion 50a together and enclosing the driver between them.
  • the diameter of the bore 52a in the rear portion 50 in the vicinity of the flange 92 is e, and the diameter of the bore on the flanges is a. This arrangement causes the fastening forces on the front section and on the rear section of the atomizer to be approximately equal.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Special Spraying Apparatus (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Catching Or Destruction (AREA)
EP80106972A 1979-11-13 1980-11-12 Ultraschall-Zerstäuber für Flüssigkeiten Expired EP0029941B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80106972T ATE12541T1 (de) 1979-11-13 1980-11-12 Ultraschall-zerstaeuber fuer fluessigkeiten.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US9311579A 1979-11-13 1979-11-13
US93115 1979-11-13
US95971 1979-12-03
US06/095,971 US4352459A (en) 1979-11-13 1979-12-03 Ultrasonic liquid atomizer having an axially-extending liquid feed passage

Publications (2)

Publication Number Publication Date
EP0029941A1 EP0029941A1 (de) 1981-06-10
EP0029941B1 true EP0029941B1 (de) 1985-04-03

Family

ID=26787141

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106972A Expired EP0029941B1 (de) 1979-11-13 1980-11-12 Ultraschall-Zerstäuber für Flüssigkeiten

Country Status (13)

Country Link
US (1) US4352459A (no)
EP (1) EP0029941B1 (no)
KR (1) KR840001869B1 (no)
CA (1) CA1154372A (no)
DE (1) DE3070423D1 (no)
DK (1) DK481680A (no)
ES (1) ES8204310A1 (no)
FI (1) FI71989C (no)
IE (1) IE50439B1 (no)
IL (1) IL61439A (no)
MX (1) MX150191A (no)
NO (1) NO155901C (no)
PT (1) PT72051B (no)

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DK481680A (da) 1981-05-14
IL61439A (en) 1984-01-31
NO155901B (no) 1987-03-09
KR840001869B1 (ko) 1984-10-24
US4352459A (en) 1982-10-05
IE50439B1 (en) 1986-04-16
PT72051A (en) 1980-12-01
NO803404L (no) 1981-05-14
KR830003941A (ko) 1983-06-30
NO155901C (no) 1987-06-24
PT72051B (en) 1981-10-22
ES496751A0 (es) 1982-05-01
IE802350L (en) 1981-05-13
MX150191A (es) 1984-03-29
EP0029941A1 (de) 1981-06-10
FI803467L (fi) 1981-05-14
FI71989B (fi) 1986-11-28
DE3070423D1 (en) 1985-05-09
ES8204310A1 (es) 1982-05-01
FI71989C (fi) 1987-03-09
CA1154372A (en) 1983-09-27

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