US3610528A - Spray guns - Google Patents

Spray guns Download PDF

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Publication number
US3610528A
US3610528A US874541A US3610528DA US3610528A US 3610528 A US3610528 A US 3610528A US 874541 A US874541 A US 874541A US 3610528D A US3610528D A US 3610528DA US 3610528 A US3610528 A US 3610528A
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US
United States
Prior art keywords
spray gun
rotor
electropneumatic
ionizers
air
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
US874541A
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English (en)
Inventor
Noel Felici
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.)
Tunzini Sames SA
Original Assignee
Tunzini Sames SA
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 Tunzini Sames SA filed Critical Tunzini Sames SA
Application granted granted Critical
Publication of US3610528A publication Critical patent/US3610528A/en
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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
    • 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
    • B05B5/0531—Power generators

Definitions

  • the air supply which is fed to the gun to atomize the material to be sprayed is also used to drive the rotor of an electrostatic generator for applying an electric charge to the atomized particles of the material to be sprayed.
  • the said rotor is provided with blades on which the air impinges to cause it to rotate.
  • the present invention relates to electropneumatic spray guns, particularly paint spray guns, having an electrostatic generator incorporated in the barrel of the spray gun.
  • electrostatic generator incorporated in the barrel of the spray gun.
  • Various types of spray guns incorporating a generator have already been proposed, in which the generator is of the electrostatic type with a rotor placed in a chamber from which extends a drive shah connected to an electric driving motor.
  • This type of electrostatic motor usually has the drawback of being heavy and cumbersome which results therefore in a spray gun which is difficult to handle.
  • the present invention relates to an electropneumatic spray gun wherein the electrostatic generator of the type having an insulating rotor with excitation ionizers and output ionizers, comprises a rotor caused to rotate by the direct action of air derived, in the spray gun, from the atomization air passage, this driving air acting on blades integral with the rotor and flowing through the rotor space.
  • FIG. 1 is a schematic view in section of an embodiment of spray gun according to the invention.
  • HO. 2 is a plan view from above, of this same spray gun.
  • the spray gun comprises a hand grip 1, a barrel 2, a paint supply pipe 3, an air supply pipe 4 and an electric cable 5.
  • the latter is used for the excitation of the electrostatic generator and carries a current of several milliamperes at a voltage between approximately 4-6 kv.
  • the electrostatic generator is formed from a rotatable disc 8 positioned in a detachable casing 9 wherein it is mounted to rotate on a shaft 10 carried in bearings 11 an 12.
  • This rotatable disc has an annular peripheral groove 13 in which are arranged, at diametrically opposite positions, on the one hand excitation ionizers l4 cooperating with inductors 15 and 16, on the other hand output ionizers I7 cooperating with output inductors l8 and 19.
  • the excitation ionizers 14 are connected to the cable 5 by contact studs whilst the excitation inductors l5 and 16 are connected by studs and by conductors 21 and 22 to the casing 23, earthed by the cable 5.
  • the output inductors l8 and 19 are connected to ionizers 17.
  • the excitation ionizers deposit, under the action of the excitation inductors 15 and 16, ions on the two faces of the groove 13, these ions being recovered by the output ionizers 17 situated adjacent an atomization nozzle 24.
  • the atomization nozzle 24 causes the atomization of the paint by a jet of air fed through the passage 4, whilst the charge of the atomized particles is effected, by reason of the energizing of the nozzle by a conductor 25 connected to the output ionizers 17.
  • lt can be seen that the rotor 8 of the electrostatic generator is driven by air impinging on the blades 26 arranged on a lower face of the rotor disc. This air is fed through a passage 27 connected to the air passage 4.
  • a trigger 28 controls a valve 29 for the air input and a valve 30 for the input of the paint under pressure, the supply of the air inducing the electric supply over the cable 5.
  • the device described produces the atomization of paint with electric charges due to the high voltage output from the generator.
  • an insulating cylinder can be used which gives similar results.
  • Such a spray gun has been produced having a cylinder 55 mm. in diameter rotating at 10,000 r.p.m. and having a consumption of drive air of the order of several cubic meters per hour, usually not exceeding 2 cubic meters per hour.
  • Such a generator has an output current of 5 to 10 microamperes at a voltage of 30 to 50 kilovolts. Such power is sufficient to electrically charge a normal flow of atomized paint and to feed it to the ob ect to be coated which is itself carried at earth potential.
  • the driving air for the electrostatic generator is obtained from the air passage 4 and evacuated by a valve 31 adjusted for an overpressure of 0.5 of an atmosphere, for example, and arranged in an area which does not disturb the atomization phenomenon.
  • the pressure of the air about the generator is higher than the atmospheric pressure, which considerably improves its electrical functioning.
  • air which has passed through the generator may also be used for the atomization.
  • the air which is supplied to the generator ensures not only the driving in rotation of this generator, but also forms a dielectric medium which is constantly renewed adjacent the rotor and electric excitation and flow elements and of which the pressure may be higher than the atmospheric pressure, which ensures a good electric resistance of the insulating medium.
  • Electropneumatic spray gun having an electrostatic generator incorporated in the barrel of the spray gun characterized in that the electrostatic generator has a insulating rotor with excitation and output ionizers and is driven in rotation by the action of the air obtained from the atomization air passage, this driving air acting on blades integral with the rotor and flowing through the rotor space.
  • Electropneumatic spray gun as claimed in claim 1, characterized in that the output ionizers are arranged adjacent the atomization nozzle.
  • Electropneumatic spray gun as claimed in claim 1 characterized in that the rotor is located in a casing incorporating not only the excitation ionizers and the output ionizers but also the drive blades of the said rotor, so that the drive air flows around all the electric elements located in the said housing.
  • Electropneumatic spray gun as claimed in claim 1 characterized in that the electrostatic generator is placed flat on the barrel of the spray gun.
  • Electropneumatic spray gun as claimed in claim 4, characterized in that the rotor is the shape of a disc.
  • Electropneumatic paint spray gun as claimed in claim 5, characterized in that the ionizers are located in an annular groove extending around the disc.
  • Electropneumatic spray gun as claimed in claim 1, characterized in that the air escapes to the atmosphere through a valve in the casing of the generator.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
US874541A 1968-11-14 1969-11-06 Spray guns Expired - Lifetime US3610528A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR38005289 1968-11-14

Publications (1)

Publication Number Publication Date
US3610528A true US3610528A (en) 1971-10-05

Family

ID=9692958

Family Applications (1)

Application Number Title Priority Date Filing Date
US874541A Expired - Lifetime US3610528A (en) 1968-11-14 1969-11-06 Spray guns

Country Status (7)

Country Link
US (1) US3610528A (xx)
JP (1) JPS4928257B1 (xx)
BE (1) BE741625A (xx)
CH (1) CH509105A (xx)
DE (1) DE1957406A1 (xx)
FR (1) FR1594779A (xx)
GB (1) GB1240079A (xx)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4219865A (en) * 1978-09-05 1980-08-26 Speeflo Manufacturing Corporation Energy conversion unit for electrostatic spray coating apparatus and the like
US4290091A (en) * 1976-12-27 1981-09-15 Speeflo Manufacturing Corporation Spray gun having self-contained low voltage and high voltage power supplies
US4462061A (en) * 1983-06-29 1984-07-24 Graco Inc. Air turbine drive for electrostatic spray gun
US5080289A (en) * 1990-05-25 1992-01-14 Graco Inc. Spraying voltage control with hall effect switches and magnet
US20040069877A1 (en) * 2002-09-30 2004-04-15 John Schaupp Bell cup skirt
EP1502655A2 (en) 2003-07-29 2005-02-02 Illinois Tool Works Inc. Powder bell with secondary charging electrode
US20050023385A1 (en) * 2003-07-29 2005-02-03 Kui-Chiu Kwok Powder robot gun
US20050056212A1 (en) * 2003-09-15 2005-03-17 Schaupp John F. Split shroud for coating dispensing equipment
US20050173556A1 (en) * 2004-02-09 2005-08-11 Kui-Chiu Kwok Coating dispensing nozzle
US20080149026A1 (en) * 2006-12-21 2008-06-26 Illinois Tool Works Inc. Coating material dispensing apparatus and method
US20090001199A1 (en) * 2007-06-29 2009-01-01 Kui-Chiu Kwok Powder gun deflector
US20090020626A1 (en) * 2007-07-16 2009-01-22 Illinois Tool Works Inc. Shaping air and bell cup combination
US20090140083A1 (en) * 2007-11-30 2009-06-04 Seitz David M Repulsion ring
US20090255463A1 (en) * 2008-04-09 2009-10-15 Illinois Tool Works Inc. Splash plate retention method and apparatus
US20090314855A1 (en) * 2008-06-18 2009-12-24 Illinois Tool Works Inc. Vector or swirl shaping air
US20110042109A1 (en) * 2009-08-19 2011-02-24 Raytheon Company Methods and apparatus for providing emergency fire escape path

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2264386C2 (de) * 1971-11-02 1982-04-22 Nordson Corp., 44001 Amherst, Ohio Elektrostatische Sprühpistole
BE790830A (fr) 1971-11-02 1973-02-15 Nordson Corp Pulverisateur electrostatique
BE791343A (fr) * 1971-11-16 1973-03-01 Nordson Corp Pulverisateur electrostatique
GB1597349A (en) * 1976-12-27 1981-09-03 Speeflo Mfg Corp Electrostatic spray coating apparatus
DE3038596A1 (de) * 1980-10-13 1982-04-22 Spritztechnik Kopperschmidt Gmbh & Co Kg, 4800 Bielefeld Elektrostatische farbspritzpistole
CN103263988A (zh) * 2013-06-03 2013-08-28 江苏大学 农用气力式静电雾化喷枪

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4290091A (en) * 1976-12-27 1981-09-15 Speeflo Manufacturing Corporation Spray gun having self-contained low voltage and high voltage power supplies
US4219865A (en) * 1978-09-05 1980-08-26 Speeflo Manufacturing Corporation Energy conversion unit for electrostatic spray coating apparatus and the like
US4462061A (en) * 1983-06-29 1984-07-24 Graco Inc. Air turbine drive for electrostatic spray gun
US5080289A (en) * 1990-05-25 1992-01-14 Graco Inc. Spraying voltage control with hall effect switches and magnet
US20040069877A1 (en) * 2002-09-30 2004-04-15 John Schaupp Bell cup skirt
US6889921B2 (en) 2002-09-30 2005-05-10 Illinois Tool Works Inc. Bell cup skirt
EP1502655A2 (en) 2003-07-29 2005-02-02 Illinois Tool Works Inc. Powder bell with secondary charging electrode
US20050023369A1 (en) * 2003-07-29 2005-02-03 Schaupp John F. Powder bell with secondary charging electrode
US20050023385A1 (en) * 2003-07-29 2005-02-03 Kui-Chiu Kwok Powder robot gun
US7128277B2 (en) 2003-07-29 2006-10-31 Illinois Tool Works Inc. Powder bell with secondary charging electrode
US20050056212A1 (en) * 2003-09-15 2005-03-17 Schaupp John F. Split shroud for coating dispensing equipment
US20050173556A1 (en) * 2004-02-09 2005-08-11 Kui-Chiu Kwok Coating dispensing nozzle
US20080149026A1 (en) * 2006-12-21 2008-06-26 Illinois Tool Works Inc. Coating material dispensing apparatus and method
US8104423B2 (en) 2006-12-21 2012-01-31 Illinois Tool Works Inc. Coating material dispensing apparatus and method
US20090001199A1 (en) * 2007-06-29 2009-01-01 Kui-Chiu Kwok Powder gun deflector
US8371517B2 (en) 2007-06-29 2013-02-12 Illinois Tool Works Inc. Powder gun deflector
US8888018B2 (en) 2007-06-29 2014-11-18 Illinois Tool Works Inc. Powder gun deflector
US20090020626A1 (en) * 2007-07-16 2009-01-22 Illinois Tool Works Inc. Shaping air and bell cup combination
US20090140083A1 (en) * 2007-11-30 2009-06-04 Seitz David M Repulsion ring
US8096264B2 (en) 2007-11-30 2012-01-17 Illinois Tool Works Inc. Repulsion ring
US20090255463A1 (en) * 2008-04-09 2009-10-15 Illinois Tool Works Inc. Splash plate retention method and apparatus
US10155233B2 (en) 2008-04-09 2018-12-18 Carlisle Fluid Technologies, Inc. Splash plate retention method and apparatus
US20090314855A1 (en) * 2008-06-18 2009-12-24 Illinois Tool Works Inc. Vector or swirl shaping air
US20110042109A1 (en) * 2009-08-19 2011-02-24 Raytheon Company Methods and apparatus for providing emergency fire escape path
US8276680B2 (en) 2009-08-19 2012-10-02 Raytheon Company Methods and apparatus for providing emergency fire escape path

Also Published As

Publication number Publication date
FR1594779A (xx) 1970-06-08
GB1240079A (en) 1971-07-21
CH509105A (fr) 1971-06-30
BE741625A (xx) 1970-04-16
JPS4928257B1 (xx) 1974-07-25
DE1957406A1 (de) 1970-06-04

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