US3049301A - Electrostatic spraying of atomized material - Google Patents

Electrostatic spraying of atomized material Download PDF

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Publication number
US3049301A
US3049301A US74811A US7481160A US3049301A US 3049301 A US3049301 A US 3049301A US 74811 A US74811 A US 74811A US 7481160 A US7481160 A US 7481160A US 3049301 A US3049301 A US 3049301A
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Prior art keywords
mist
gap
nozzle
spraying
electrostatic spraying
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Expired - Lifetime
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US74811A
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Heuschkel Hans
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Sulzer Escher Wyss GmbH
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Escher Wyss GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying

Definitions

  • Electrostatic spraying apparatus are known in which the materials to be sprayed are sprayed by electrostatic forces from blade-like spraying edges which are at a high electrical potential on to the object to be provided with a surface coating. In such cases, it is necessary that the material to be sprayed should not be electrically conductive. As is known, however, aqueous solutions, and electrically conductive material when it is sufficiently thinly liquid, can be atomized from. the liquid surface in the form of an extremely fine mist under the action of ultrasonic waves. This mist can then be electrically charged so as to be conducted to a counter-electrode under the influence of the electrostatic forces.
  • the invention relates to an electrostatic spraying apparatus for material atomized in the form of a mist, by means of which electrically conductive spraying material can be applied in layers to objects and foils just as well as non-conductive spraying material can be. applied thereto by means of the known apparatus.
  • the apparatus comprises for this purpose a spraying nozzle having an outlet aperture in the form of a gap for the mist of material to be sprayed and a cathode arranged in the spraying nozzle.
  • the cathode is preferably constructed in the form of a broom in such manner that the individual wires of the broom-like cathode extend in spaced relationship through the center line of the crosssection of the gap-like outlet aperture of the nozzle in the longitudinal direction of the said aperture.
  • FIGURE 1 is a longitudinal section through the apparatus and FIGURE 2 is a View from the outlet side.
  • the apparatus consists substantially of a housing 1, a nozzle 2 adjoining the upper side of the latter and a cathode 3 disposed in the said nozzle.
  • the housing 1 is provided with an obliquely downward extending tubular branch 4 which issues from the lowermost part of the housing 1 and serves for the supply of the spraying material atomized in the form of a mist.
  • the said tube is connected, for example, to an ultrasonic atomizer (not shown) for aqueous solutions or electrically conductive liquid spraying material.
  • the electrical voltage is applied to the cathode by means of a conductor 5 which extends through a plug 6 closing the lower end of the housing 1 and is surrounded by a tube 7 within the housing 1.
  • the parts 1, 2, 4, 7 are preferably made of glass in order to guide the mist satisfactorily to the nozzle without being affected by the voltage.
  • the nozzle 2 has a gap-like outlet aperture 8.
  • the cathode 3 is provided with a plurality of Wires 9 extending Patented Aug. 14, 1962 toward the outlet gap 8 of the nozzle 2 and imparting a broom-like form to the cathode.
  • the wires 9 extend in spaced relationship through the center line of the crosssection of the gap-like aperture 8 in the longitudinal direction of the said aperture.
  • the mist of spraying material entering the tubular branch 4 first enters, under a light superatmospheric pressure, the housing 1 forming a fore-chamber. It then enters the nozzle 2 in a steady state and free from drops and flows past the broom-like electrode 3, 9 through the gaplike outlet aperture 8 into the atmosphere.
  • the tips of the wires '9 impart an unipolar charge to the mist, so that it uniformly coats objects or foils which are at an opposite electrical potential.
  • the condensate separated from the mist in the form of drops in the fore-chamber 1 of the apparatus can flow back by gravity to the atomizer through the tubular branch 4 which at the same time serves for the supply of the mist of material to be sprayed.

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  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Catching Or Destruction (AREA)

Description

Aug. 14, 1962 H.-HEUSCHKEL ELECTROSTATIC SPRAYING OF ATOMIZED MATERIAL Filed Dec. 9, 1960 INVENTOR. Hans He usc hke I BY Unite 3,049,301 ELECTROSTATIC SPRAYKNG OF ATOMIZED MATERIAL Hans Heuschkel, Wurttemberg, Germany, assignor to Escher Wyss G.m.b.H., Wurttemherg, Germany, a corporation of Germany Filed Dec. 9, 1960, Ser. No. 74,811 Claims priority, application Germany Dec. 18, 1959 3 Claims. (Cl. 239-15) Electrostatic spraying apparatus are known in which the materials to be sprayed are sprayed by electrostatic forces from blade-like spraying edges which are at a high electrical potential on to the object to be provided with a surface coating. In such cases, it is necessary that the material to be sprayed should not be electrically conductive. As is known, however, aqueous solutions, and electrically conductive material when it is sufficiently thinly liquid, can be atomized from. the liquid surface in the form of an extremely fine mist under the action of ultrasonic waves. This mist can then be electrically charged so as to be conducted to a counter-electrode under the influence of the electrostatic forces.
The invention relates to an electrostatic spraying apparatus for material atomized in the form of a mist, by means of which electrically conductive spraying material can be applied in layers to objects and foils just as well as non-conductive spraying material can be. applied thereto by means of the known apparatus.
The apparatus comprises for this purpose a spraying nozzle having an outlet aperture in the form of a gap for the mist of material to be sprayed and a cathode arranged in the spraying nozzle. The cathode is preferably constructed in the form of a broom in such manner that the individual wires of the broom-like cathode extend in spaced relationship through the center line of the crosssection of the gap-like outlet aperture of the nozzle in the longitudinal direction of the said aperture.
A constructional example of the subject of the invention is illustrated in simplified form in the drawings, in which:
FIGURE 1 is a longitudinal section through the apparatus and FIGURE 2 is a View from the outlet side.
The apparatus consists substantially of a housing 1, a nozzle 2 adjoining the upper side of the latter and a cathode 3 disposed in the said nozzle. The housing 1 is provided with an obliquely downward extending tubular branch 4 which issues from the lowermost part of the housing 1 and serves for the supply of the spraying material atomized in the form of a mist. The said tube is connected, for example, to an ultrasonic atomizer (not shown) for aqueous solutions or electrically conductive liquid spraying material.
The electrical voltage is applied to the cathode by means of a conductor 5 which extends through a plug 6 closing the lower end of the housing 1 and is surrounded by a tube 7 within the housing 1.
Owing to the high voltage app-lied to the cathode 3, the parts 1, 2, 4, 7 are preferably made of glass in order to guide the mist satisfactorily to the nozzle without being affected by the voltage.
The nozzle 2 has a gap-like outlet aperture 8. The cathode 3 is provided with a plurality of Wires 9 extending Patented Aug. 14, 1962 toward the outlet gap 8 of the nozzle 2 and imparting a broom-like form to the cathode. The wires 9 extend in spaced relationship through the center line of the crosssection of the gap-like aperture 8 in the longitudinal direction of the said aperture.
The mist of spraying material entering the tubular branch 4 first enters, under a light superatmospheric pressure, the housing 1 forming a fore-chamber. It then enters the nozzle 2 in a steady state and free from drops and flows past the broom-like electrode 3, 9 through the gaplike outlet aperture 8 into the atmosphere. The tips of the wires '9 impart an unipolar charge to the mist, so that it uniformly coats objects or foils which are at an opposite electrical potential.
The condensate separated from the mist in the form of drops in the fore-chamber 1 of the apparatus can flow back by gravity to the atomizer through the tubular branch 4 which at the same time serves for the supply of the mist of material to be sprayed.
What is claimed is:
1. Electrostatic spraying apparatus for spraying a mist of atomized material comprising a nozzle having an elongated gap as an outlet, a conduit for supplying mist to the gap and a chamber therebetween constituting a path of flow for the mist from the conduit to the gap; a broomshaped electrode disposed Within the path of flow, the electrode comprising a body and a plurality of laterallyspaced Wires extending therefrom in the direction of flow, said wires projecting through the gap and lying on its elongated centerline and means electrically insulated from the nozzle for applying an electric potential to the electrode.
2. Electrostatic spraying apparatus for spraying a mist of atomized material comprising a nozzle having an elongated gap as an outlet, a conduit for supplying mist to the gap and a chamber therebetween constituting a path of flow for the mist from the conduit to the gap; a broomshaped electrode disposed within the path of flow, the electrode comprising a body and a plurality of laterallyspaced wires extending therefrom in the direction of flow, said wires projecting through the gap and lying on its elongated centerline; means electrically insulated from the nozzle for applying an electric potential to the electrode and means for discharging from the chamber any liquid collected therein.
3. The apparatus defined in claim 2 wherein the liquid is collected by gravity in an end of the chamber remote from the gap and the body of the electrode, and the discharging means, comprises a tubular branch that discharges by gravity the liquid from that end of the chamber, the tubular branch constituting at least a portion of the mist supplying conduit.
References Cited in the file of this patent UNITED STATES PATENTS 1,854,475 Littlefield Apr. 19, 1932 2,571,608 Plagge Oct. 16, 1951 2,754,225 Gfeller July 10, 1956 2,766,064 Schweitzer Get. 9, 1956 2,826,513 Blanchard Mar. 11, 1958 2,890,388 Crosky et a1 June 9, 1959 2,901,178 Norris Aug. 25, 1959
US74811A 1959-12-13 1960-12-09 Electrostatic spraying of atomized material Expired - Lifetime US3049301A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEE18657A DE1225523B (en) 1959-12-13 1959-12-13 Electrostatic applicator spray device

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US3049301A true US3049301A (en) 1962-08-14

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US74811A Expired - Lifetime US3049301A (en) 1959-12-13 1960-12-09 Electrostatic spraying of atomized material

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US (1) US3049301A (en)
CH (1) CH380599A (en)
DE (1) DE1225523B (en)
FR (1) FR1276300A (en)
GB (1) GB960607A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263127A (en) * 1961-04-14 1966-07-26 Sames Mach Electrostat Means for electrostatic coating
US3326182A (en) * 1963-06-13 1967-06-20 Inoue Kiyoshi Electrostatic spray device and method
US3498541A (en) * 1968-03-25 1970-03-03 Goodyear Tire & Rubber Apparatus for altering the shape of an electrostatic spray pattern
US3545208A (en) * 1969-01-15 1970-12-08 Nasa Annular slit colloid thrustor
US3589606A (en) * 1968-12-23 1971-06-29 Gillette Co Electrostatic spray coating apparatus
US3711022A (en) * 1969-10-20 1973-01-16 Glick L Electrostatic coating apparatus
US3841264A (en) * 1971-09-29 1974-10-15 S Masuda Apparatus for applying dust particles by contact type electric field curtain
US4301970A (en) * 1978-06-20 1981-11-24 Margherita Craighero Powered aerosol spray device
US5086972A (en) * 1990-08-01 1992-02-11 Hughes Aircraft Company Enhanced electrostatic paint deposition method and apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3608415A1 (en) * 1986-03-13 1987-09-24 Gema Ransburg Ag ELECTROSTATIC SPRAYING DEVICE FOR COATING POWDER
CN106694265A (en) * 2017-01-16 2017-05-24 西北农林科技大学 Bubble type electrostatic nozzle

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1854475A (en) * 1920-11-27 1932-04-19 Littlefield Edgar Earle Method for electrically charging fluids
US2571608A (en) * 1945-06-29 1951-10-16 Westinghouse Electric Corp Method and apparatus for connecting articles with a graded coating of glass
US2754225A (en) * 1951-11-22 1956-07-10 Martin Von Schulthess Method of spray-coating with metals
US2766064A (en) * 1955-08-22 1956-10-09 Howard V Schweitzer Paint gun
US2826513A (en) * 1950-10-13 1958-03-11 Blanchard Andre Method and apparatus for electrostatic coating utilizing projection of liquid solelyby the electric field
US2890388A (en) * 1955-11-30 1959-06-09 Gen Motors Corp Electrostatic spray charger
US2901178A (en) * 1956-08-30 1959-08-25 Edward O Norris Spraying apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE887025C (en) * 1951-03-11 1953-08-20 Siemens Ag Method and device for atomizing a liquid
US2803496A (en) * 1951-11-21 1957-08-20 Ransburg Electro Coating Corp Atomizing apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1854475A (en) * 1920-11-27 1932-04-19 Littlefield Edgar Earle Method for electrically charging fluids
US2571608A (en) * 1945-06-29 1951-10-16 Westinghouse Electric Corp Method and apparatus for connecting articles with a graded coating of glass
US2826513A (en) * 1950-10-13 1958-03-11 Blanchard Andre Method and apparatus for electrostatic coating utilizing projection of liquid solelyby the electric field
US2754225A (en) * 1951-11-22 1956-07-10 Martin Von Schulthess Method of spray-coating with metals
US2766064A (en) * 1955-08-22 1956-10-09 Howard V Schweitzer Paint gun
US2890388A (en) * 1955-11-30 1959-06-09 Gen Motors Corp Electrostatic spray charger
US2901178A (en) * 1956-08-30 1959-08-25 Edward O Norris Spraying apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263127A (en) * 1961-04-14 1966-07-26 Sames Mach Electrostat Means for electrostatic coating
US3326182A (en) * 1963-06-13 1967-06-20 Inoue Kiyoshi Electrostatic spray device and method
US3498541A (en) * 1968-03-25 1970-03-03 Goodyear Tire & Rubber Apparatus for altering the shape of an electrostatic spray pattern
US3589606A (en) * 1968-12-23 1971-06-29 Gillette Co Electrostatic spray coating apparatus
US3545208A (en) * 1969-01-15 1970-12-08 Nasa Annular slit colloid thrustor
US3711022A (en) * 1969-10-20 1973-01-16 Glick L Electrostatic coating apparatus
US3841264A (en) * 1971-09-29 1974-10-15 S Masuda Apparatus for applying dust particles by contact type electric field curtain
US4301970A (en) * 1978-06-20 1981-11-24 Margherita Craighero Powered aerosol spray device
US5086972A (en) * 1990-08-01 1992-02-11 Hughes Aircraft Company Enhanced electrostatic paint deposition method and apparatus

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Publication number Publication date
DE1225523B (en) 1966-09-22
FR1276300A (en) 1961-11-17
CH380599A (en) 1964-07-31
GB960607A (en) 1964-06-10

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