US3111266A - Spray painting gun for electrostatic spray painting - Google Patents

Spray painting gun for electrostatic spray painting Download PDF

Info

Publication number
US3111266A
US3111266A US70711A US7071160A US3111266A US 3111266 A US3111266 A US 3111266A US 70711 A US70711 A US 70711A US 7071160 A US7071160 A US 7071160A US 3111266 A US3111266 A US 3111266A
Authority
US
United States
Prior art keywords
paint
spray
gun
nozzle
spray painting
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
US70711A
Other languages
English (en)
Inventor
Axelson Eskil Anders August
Gyllinder Lars Anders Gustaf
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.)
Svenska Maskinverken AB
Original Assignee
Svenska Maskinverken AB
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 Svenska Maskinverken AB filed Critical Svenska Maskinverken AB
Application granted granted Critical
Publication of US3111266A publication Critical patent/US3111266A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B05B7/067—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet the liquid outlet being annular

Definitions

  • spray painting guns having a circular spray field are used.
  • the particles In connection with the aforesaid spraying into an electrostatic field, the particles should be divided as finely as possible and should have such a low rate of efilux that their kinetic energy will not be of such a magnitude which prevents the paint particles from being attracted by the electrostatic field. Even if in previously known methods the lowest possible air pressure for atomizing the paint were to be applied and the viscosity of the paint were to be reduced to such an extent that the paint is almost as thin as water, it nevertheless would be necessary to apply such a high pressure that the rate of flow of the atomized paint particles would be relatively high, with the result that a great portion of the paint particles would not be taken along by the electrostatic field but are sprayed past the same.
  • the spray gun according to the invention eliminates the above drawbacks by providing a lengthening piece or delivery tube connected to the gun nozzle through which the air-atomized paint is sprayed with a substantially circular spray field which leaves the gun preferably at right angles to the geometrical axis of the spray nozzle.
  • the delivery tube is surrounded by an air tube which is connected to a compressed air source and opens directly 3,1 l 1,26% Patented Nov. 19, 1963 behind the nozzle, so that the adjustable air flow leaving the tube deflects the circular spray field in the forward direction.
  • An air stream directed into the tube is made adjustable by means of a special valve making it possible to adjustably deflect the circular spray field in the forward direction.
  • the atomization can be carried out with high air pressure enabling the use of considerably thicker paints than heretofore possible.
  • the finely divided paint particles are pressed forward by means of the air stream following behind, so that by adjusting the air stream the paint particles can be caused to enter the electrostatic field at very low speed, in which field the particles are carried forward so that they are attracted by the article to be sprayed. In this manner, the paint losses are very low compared with previously known devices.
  • a spray gun of known construction in which the paint is atomized by compressed air substantially circularly and perpendicularly to the desired spraying direction, and which according to the invention is suspended, for example, on porcelain insulators or provided with an insulated handle, and which is connected to a high-voltage direct-current source of about 100,000 v., preferably with negative potential, said spray gain according to the invention being provided with a spaced tube, for example of metal, surrounding the atomizing nozzle of the gun, the mouth of said tube preferably having a knife-sharp edge and being disposed directly behind the mouth of the atomizing nozzle as described above.
  • the electrons flowing out of the tube and passing said sharp edge efiect a negative ionization of the paint flowing in front of said sharp edge.
  • the paint panticles are deflected electrostatically by about ninety degrees into the direction of the article to be coated with paint, which article represents the positive pole whereon, consequently, the paint particles will deposit.
  • Said deflecting ionizing air stream which at the same time contributes to an additional charge of the paint particles, is also required when higher atomizing pressures are needed, for example, when high spraying capacity and paint feed is required or when the painting is carried out with thick paints, because in such cases the electrostatic deflecting force is not sufiicient to effect a satisfactory result.
  • one or a plurality of additional ionizing electrodes may be spaced around the air tube-electrode which, preferably, should also be provided with sharp edges or points and also may have long and narrow, square or other Ehitpes in order to efiect a suitable shape of the spray
  • FIG. 1 shows in a schematic manner an apparatus wherein no electric charge occurs on the spray guns, but which is provided with a special discharge electrode between the guns and the article to be sprayed;
  • FIG. 2 is a side view, partially in section, of a spray painting gun for electrostatic spray painting according to the invention
  • FIG. 2a shows the gun provided with needle-like members
  • FIG. 3 shows schematically an apparatus corresponding to that of FIG. 1, but wherein the gun is the discharge electrode
  • FIG. 4 shows a side view according to FIG. 2, but with the spray gun designed according to the embodiment in FIG. 3.
  • a spray painting chamber 1 is provided with a paint separating filter 2 and a suction fan 3.
  • the spray painting chamber comprises in its interior a supporting bar 4 carrying the article 5 to be spray painted. Said article 5 is grounded by means of a wire 6. From the ceiling 7 of the chamber 1 is suspended a cable 8 which carries before the article in insulated state an electrode frame 9 which is connected to a negative direct-current voltage.
  • each of said guns 10 has a lengthening piece 11 between the body '12 of the spray gun and a spray nozzle 13 for a circular spray field.
  • Around said lengthening piece :11 is spaced an air tube connected by a sleeve 14 to a compressed air source (not shown), said tube 15 opening directly behind the mouth 16 of the spray nozzle 13.
  • the air atomized paint is discharged from mouth 16 of spray nozzle 13.
  • Lengthening piece 11 conducts paint and compressed air for atomizing the paint in known manner.
  • the air tube 15 is provided with a control valve 17 for adjusting the speed of the air stream.
  • said tube 15 has three centering screws 18 for centering the air tube around the lengthening piece 11 of the nozzle.
  • a spray painting chamber 101 comprises a paint separating filter 102 with a suction fan 163.
  • a supporting bar 143 4 carries the article *105 to be spray painted, which article is grounded by a Wire 106.
  • an insulator 108 In the ceiling 107 is secured an insulator 108 to which is attached an electric line 110 carrying the spray paint gun 109, to which line 110 highvoltage current is delivered through the wire 111.
  • line 110 highvoltage current is delivered through the wire 111.
  • FIG. 4 shows a spray painting gun according to the invention, the gun being provided with a lengthening piece 112 between the body 113 of the gun and the nozzle 114.
  • a tube .115 which via a sleeve 116 is conconnected to a compressed air source (not shown), said sleeve being provided with a valve 117 for adjusting the air delivery.
  • Said air tube 115 opens directly behind the mouth of the spray nozzle 114 and has at its end a sharp edge 119 for the outflow of the electrons.
  • the air atomized paint is discharged from the mouth of the spray nozzle 114.
  • Lengthening piece 112 conducts 1 paint and compressed air for atomizing the paint in known manner.
  • the spray gun is provided with an additional tubular member 113 disposed concentrically with said tube 115, said member 118 having such a diameter that between said tube and the member 113 is formed a space for increased outfiow of electrons, for which purpose the forwardly directed end of said member 118 is provided with a sharp edge.
  • the electrodes which are described above may, of course, be designed in any other manner for achieving the same effect.
  • the electrodes may have pointed ends or the like, or they may consist of a plurality of tubes or pins arranged equi-distantly on a peripheral line around the air tube 115, said tubes or pins having sharp points or edges and being electrically connected to the air tube by means of spokes or in another manner.
  • a spray gun for spray painting comprising nozzle means having a longitudinal axis and an opening for discharging a continuous disk-like spray of gas-atomized paint through said opening in a plane substantially perpendicular to said axis, air blower means surrounding said nozzle means and located proximate said opening and behind the same, said air blower means being adapted for connection to a source of compressed air to blow the latter in an axial direction against said spray of gas-atomized paint to deflect the same in a forward direction substantially parallel to said axis, and discharge electrode means located behind the opening of the nozzle means for ionizing the gas-atomized paint as the latter is discharged from said nozzle means such that an object to be sprayed which is of opposite charge to that of said paint spray is etfective to attract the paint spray theretowards whereby said gas-atomized paint is directed towards said object under the action of both said air blower means and electrostatic attraction both of which are independent of the atomizing of the paint prior to the discharge of the latter through the opening of the opening
  • a spray gun for spray painting comprising a nozzle having a longitudinal axis and an annular opening lying substantially in a plane perpendicular to said axis for discharging a continuous disk-like spray of gas-atomized paint through said opening and substantially in said plane, a tube surrounding said nozzle in coaxial manner and having an opening behind the nozzle opening, and adjacent thereto, said tube being adapted for connection to a source of compressed air to blow the latter through the tube opening towards said spray of gas-atomized paint to deflect the same in entirety in a forward direction substantially parallel to said axis, and discharge electrode means located behind the nozzle for ionizing the gas-atomized paint as the latter is discharged from said nozzle such that an object to be sprayed which is of opposite charge to that of said spray is effective to attract the paint spray theretowards whereby said gas-atomized paint is directed towards said object under the action of both the compressed air discharge from the tube opening and electrostatic attraction both of which are independent of the atomizing of the paint prior to the discharge thereof through the opening of

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
US70711A 1959-11-20 1960-11-21 Spray painting gun for electrostatic spray painting Expired - Lifetime US3111266A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1093359 1959-11-20
SE1096759 1959-11-21

Publications (1)

Publication Number Publication Date
US3111266A true US3111266A (en) 1963-11-19

Family

ID=26655798

Family Applications (1)

Application Number Title Priority Date Filing Date
US70711A Expired - Lifetime US3111266A (en) 1959-11-20 1960-11-21 Spray painting gun for electrostatic spray painting

Country Status (7)

Country Link
US (1) US3111266A (it)
CH (1) CH388820A (it)
DE (1) DE1239218B (it)
DK (1) DK103169C (it)
ES (1) ES262539A1 (it)
GB (1) GB929440A (it)
NL (2) NL132551C (it)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3210008A (en) * 1962-02-16 1965-10-05 Atlas Copco Ab Electrostatic spray coating apparatus
US3233831A (en) * 1962-06-04 1966-02-08 Sames Mach Electrostat Electrostatic spraying apparatus having vortex atomizing construction
US3292860A (en) * 1963-10-28 1966-12-20 Ransburg Electro Coating Corp Electrostatic spray coating apparatus
US3327948A (en) * 1964-07-07 1967-06-27 Cosmic Inc Method of electrostatic coating including velocity reduction
US3344992A (en) * 1964-01-27 1967-10-03 Edward O Norris Spray gun
US3401883A (en) * 1965-08-26 1968-09-17 Messrs Ernst Mueller Spray pistol
US3464633A (en) * 1967-11-16 1969-09-02 Trw Inc Multiple fluid controlling shear valve
US3476319A (en) * 1968-11-25 1969-11-04 Ransburg Electro Coating Corp Electrostatic powder-coating apparatus
US3561677A (en) * 1967-07-07 1971-02-09 Gyromat Corp Electrostatic air-liquid atomizing nozzle for paints and the like
US3625424A (en) * 1969-05-22 1971-12-07 Volstatic Ltd Apparatus and method for converting a pressure-supplied spray gun into an electrostatic spray gun
US3635401A (en) * 1969-10-27 1972-01-18 Gourdine Coating Systems Inc Electrostatic spraying methods and apparatus
US3672569A (en) * 1970-07-16 1972-06-27 Graco Inc Electrostatic spray gun nozzle and air cap
US3700168A (en) * 1966-04-28 1972-10-24 Ransburg Electro Coating Corp Spray coating apparatus
US4921172A (en) * 1987-02-12 1990-05-01 Sames S.A. Electrostatic sprayer device for spraying products in powder form
CN105457813A (zh) * 2015-12-31 2016-04-06 东莞市誉铭新精密技术有限公司 一种喷漆回收装置
CN117399223A (zh) * 2023-12-12 2024-01-16 沈阳德通热喷涂新技术有限公司 一种石化阀门耐腐蚀涂层自动旋转喷涂装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU173207B (hu) * 1976-11-10 1979-03-28 Hajtomuevek Es Festoekeszuelek Ustanovka dlja pul'verizacionnoj okraski s povorotnoj golovkoj i mnogoslojnym elektrodom
DE3919653A1 (de) * 1989-06-16 1990-12-20 Alfo Ag Elektrostatische spritzpistole
CN111229523B (zh) * 2020-03-14 2024-07-09 江阴多复包装材料有限公司 一种铝箔二次雾化高压静电喷涂装置
CN114308589B (zh) * 2021-12-22 2024-04-19 容创友 一种铝型材静电粉末喷涂工艺

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2302289A (en) * 1938-12-06 1942-11-17 Union Oil Co Electrified spray method and apparatus
US2677626A (en) * 1950-03-17 1954-05-04 Mishawaka Rubber & Woolen Mfg Method of forming lumpy deposits by spraying
US2685536A (en) * 1944-09-29 1954-08-03 Ransburg Electro Coating Corp Method for electrostatically coating articles
US2710773A (en) * 1952-08-27 1955-06-14 Sedlacsik John Electrostatic spray coating apparatus
US2745210A (en) * 1953-07-07 1956-05-15 Raymond L Hild Insecticide distributor
US2809902A (en) * 1951-08-09 1957-10-15 Ransburg Electro Coating Corp Method and apparatus for electrostatically coating articles
US2894691A (en) * 1955-01-11 1959-07-14 Sedlacsik John Electrostatic deposition
US2911323A (en) * 1955-11-29 1959-11-03 Gen Motors Corp Electrostatic method and apparatus using non-conductive discharge means
US2926106A (en) * 1956-07-16 1960-02-23 Ransburg Electro Coating Corp Apparatus and methods for electrostatic coating utilizing an inner electrode to substantially reduce the central void of the annular spray pattern
US2959214A (en) * 1954-11-15 1960-11-08 Swingfire Ltd Pulse jet apparatus
US2966310A (en) * 1959-06-30 1960-12-27 Interplanetary Res & Dev Corp Electrostatic deposition spray means
US2993469A (en) * 1957-05-24 1961-07-25 Aeroprojects Inc Aerosolization and coating apparatus
US3000574A (en) * 1959-12-08 1961-09-19 Interplanetary Res & Dev Corp Dual atomization and electrostatic deposition means

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE962590C (de) * 1943-12-28 1957-04-25 Metallgesellschaft Ag Einrichtung zur Herstellung von Lack-, Farb- oder Metallueberzuegen unter Verwendung eines elektrostatischen Feldes
DE973478C (de) * 1952-04-01 1960-03-03 Metallgesellschaft Ag Vorrichtung zur Ausbildung fein verteilter Nebel in Form einer Wolke fuer die Abscheidung im elektrostatischen Feld unter Anwendung eines Hilfsgasstromes
BE519260A (it) * 1952-04-18
DE1027113B (de) * 1952-12-12 1958-03-27 Licentia Gmbh Verfahren und Vorrichtung zum elektrostatischen Zerstaeuben und Niederschlagen von UEberzugsmaterial
DE1050248B (de) * 1955-02-25 1959-02-05 Garfield N. J. John Sedlacsik (V. St. A.) Mit Druckgas betriebene Spritzpistole

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2302289A (en) * 1938-12-06 1942-11-17 Union Oil Co Electrified spray method and apparatus
US2685536A (en) * 1944-09-29 1954-08-03 Ransburg Electro Coating Corp Method for electrostatically coating articles
US2677626A (en) * 1950-03-17 1954-05-04 Mishawaka Rubber & Woolen Mfg Method of forming lumpy deposits by spraying
US2809902A (en) * 1951-08-09 1957-10-15 Ransburg Electro Coating Corp Method and apparatus for electrostatically coating articles
US2710773A (en) * 1952-08-27 1955-06-14 Sedlacsik John Electrostatic spray coating apparatus
US2745210A (en) * 1953-07-07 1956-05-15 Raymond L Hild Insecticide distributor
US2959214A (en) * 1954-11-15 1960-11-08 Swingfire Ltd Pulse jet apparatus
US2894691A (en) * 1955-01-11 1959-07-14 Sedlacsik John Electrostatic deposition
US2911323A (en) * 1955-11-29 1959-11-03 Gen Motors Corp Electrostatic method and apparatus using non-conductive discharge means
US2926106A (en) * 1956-07-16 1960-02-23 Ransburg Electro Coating Corp Apparatus and methods for electrostatic coating utilizing an inner electrode to substantially reduce the central void of the annular spray pattern
US2993469A (en) * 1957-05-24 1961-07-25 Aeroprojects Inc Aerosolization and coating apparatus
US2966310A (en) * 1959-06-30 1960-12-27 Interplanetary Res & Dev Corp Electrostatic deposition spray means
US3000574A (en) * 1959-12-08 1961-09-19 Interplanetary Res & Dev Corp Dual atomization and electrostatic deposition means

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3210008A (en) * 1962-02-16 1965-10-05 Atlas Copco Ab Electrostatic spray coating apparatus
US3233831A (en) * 1962-06-04 1966-02-08 Sames Mach Electrostat Electrostatic spraying apparatus having vortex atomizing construction
US3292860A (en) * 1963-10-28 1966-12-20 Ransburg Electro Coating Corp Electrostatic spray coating apparatus
US3344992A (en) * 1964-01-27 1967-10-03 Edward O Norris Spray gun
US3327948A (en) * 1964-07-07 1967-06-27 Cosmic Inc Method of electrostatic coating including velocity reduction
US3401883A (en) * 1965-08-26 1968-09-17 Messrs Ernst Mueller Spray pistol
US3700168A (en) * 1966-04-28 1972-10-24 Ransburg Electro Coating Corp Spray coating apparatus
US3561677A (en) * 1967-07-07 1971-02-09 Gyromat Corp Electrostatic air-liquid atomizing nozzle for paints and the like
US3464633A (en) * 1967-11-16 1969-09-02 Trw Inc Multiple fluid controlling shear valve
US3476319A (en) * 1968-11-25 1969-11-04 Ransburg Electro Coating Corp Electrostatic powder-coating apparatus
US3625424A (en) * 1969-05-22 1971-12-07 Volstatic Ltd Apparatus and method for converting a pressure-supplied spray gun into an electrostatic spray gun
US3635401A (en) * 1969-10-27 1972-01-18 Gourdine Coating Systems Inc Electrostatic spraying methods and apparatus
US3672569A (en) * 1970-07-16 1972-06-27 Graco Inc Electrostatic spray gun nozzle and air cap
US4921172A (en) * 1987-02-12 1990-05-01 Sames S.A. Electrostatic sprayer device for spraying products in powder form
CN105457813A (zh) * 2015-12-31 2016-04-06 东莞市誉铭新精密技术有限公司 一种喷漆回收装置
CN117399223A (zh) * 2023-12-12 2024-01-16 沈阳德通热喷涂新技术有限公司 一种石化阀门耐腐蚀涂层自动旋转喷涂装置
CN117399223B (zh) * 2023-12-12 2024-02-06 沈阳德通热喷涂新技术有限公司 一种石化阀门耐腐蚀涂层自动旋转喷涂装置

Also Published As

Publication number Publication date
ES262539A1 (es) 1961-02-01
DK103169C (da) 1965-11-22
NL132551C (it)
CH388820A (de) 1965-02-28
NL258128A (it)
DE1239218B (de) 1967-04-20
GB929440A (en) 1963-06-26

Similar Documents

Publication Publication Date Title
US3111266A (en) Spray painting gun for electrostatic spray painting
US5584931A (en) Electrostatic spray device
US5409162A (en) Induction spray charging apparatus
US4221339A (en) Liquid spraying device
US3698635A (en) Spray charging device
US5353995A (en) Device with rotating ionizer head for electrostatically spraying a powder coating product
US4343433A (en) Internal-atomizing spray head with secondary annulus suitable for use with induction charging electrode
US3589607A (en) Electrostatic spray gun having an adjustable spray material orifice
US4135667A (en) Apparatus for the electrostatic coating of workpieces
US3698636A (en) Device for the electrostatic application of protective coatings with synthetic powders by the use of spray guns
US3635401A (en) Electrostatic spraying methods and apparatus
US3613993A (en) Electrostatic painting method and apparatus
JPS637824B2 (it)
US3606972A (en) Spray coating apparatus
US3540653A (en) Apparatus for dispersing and electrically charging substances in discrete particulate form
US3837573A (en) Apparatus for electrified spraying
US3764068A (en) Method of protecting electrostatic spray nozzles from fouling
US6951309B2 (en) Powder spray coating device
GB749008A (en) Improvements in or relating to spray coating of articles and apparatus for use in connection therewith
US20150273494A1 (en) Spray tip assembly for electrostatic spray gun
US4157162A (en) Electrostatic spraying apparatus
GB1209653A (en) Apparatus for electrostatic spray coating
JPH0510983B2 (it)
WO2005014177A1 (en) Method and apparatus for dispensing paint powders for powder coatings
US7478763B2 (en) Spray coating device for spraying coating material, in particular coating powder