EP0553052B1 - Pistolet pour pulvérisation électrostatique de matériaux en poudre de diverses couleurs et caractéristiques - Google Patents

Pistolet pour pulvérisation électrostatique de matériaux en poudre de diverses couleurs et caractéristiques Download PDF

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Publication number
EP0553052B1
EP0553052B1 EP19930500006 EP93500006A EP0553052B1 EP 0553052 B1 EP0553052 B1 EP 0553052B1 EP 19930500006 EP19930500006 EP 19930500006 EP 93500006 A EP93500006 A EP 93500006A EP 0553052 B1 EP0553052 B1 EP 0553052B1
Authority
EP
European Patent Office
Prior art keywords
gun
nozzle
passage
rod
electrode
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
EP19930500006
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0553052A1 (fr
Inventor
José De Fusco Lupo
Fabio De Fusco Izquierdo
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.)
FUSCO IZQUIERDO FABIO DE
Original Assignee
FUSCO IZQUIERDO FABIO DE
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Publication date
Application filed by FUSCO IZQUIERDO FABIO DE filed Critical FUSCO IZQUIERDO FABIO DE
Publication of EP0553052A1 publication Critical patent/EP0553052A1/fr
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Anticipated expiration legal-status Critical
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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
    • 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
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials

Definitions

  • the present invention relates to a gun for electrostatic spraying of powder materials, in particular powder paint of various colors and characteristics, including powder of paint with metallic pigments for metallic paint applications.
  • the proposed gun has been designed to simplify the tasks of color change as much as possible, by replacing, essentially, a single piece, which consists of a nozzle, at low cost, quick and very simple assembly and disassembly, associated with body of the gun barrel, having the particularity that this nozzle has a lateral opening for the arrangement, by means of a coupling piece or connection of the supply pipe of the powder-air mixture, which, thus penetrates directly to inside this nozzle and is electrostatically charged outside its axial passage duct.
  • the air-powder mixture inlet and conduction pipe extends through the body of the spray gun, as can be seen in European patent EP- A-110 753, property of the depositor, which involves manufacturing the body of the complex gun, because it is necessary to build, inside, said conduit for circulation of the powder-air stream.
  • the powder-air mixture when it passes through the body thereof, also circulates near the high voltage generator block, formed, conventionally, by a transformer and an oscillator associated with a voltage multiplier circuit, with which, if the powder contains metallic pigments, this proximity alters the conditions of electrostatic charge of this current of powder-air.
  • Patent EP-A-164 837 which relates to an electrostatic spray gun, proposes an exchangeable barrel section, very complex and even, at its terminal section, near the spraying area, two sockets and differentiated conduits for the supply and circulation of pressurized air and fluidized powder paint also by pressurized air, respectively.
  • Said terminal portion is, moreover, very bulky with a larger section than the rest of the barrel, which makes its use difficult in the case where it must be inserted into recesses or tubular bodies.
  • US-A-5,056,720 describes a gun for electrostatic spray which can be electrically connected alternatively either to an internal high voltage generator or to an external high voltage source.
  • the pistol comprises with constructive purposes two sections a first barrel section having means 95 for connecting it to a source of powder-air supply and to a source of supply of pressurized air, means for circulation and the dispersion of these two fluids, at least one electrode 108 of electrostatic charge and means for electrically connecting said electrode 108 to the high voltage power supply 20 and a second handle section attached.
  • the barrel section 72 has various tubular portions 74, 76, 96 attached and thus it ends with a nozzle 96, fitted removably to a tubular portion 76 (with an inclined lateral opening 95), which in turn is attached stationary by a screw 80, at an end portion 78 which ends a section 74.
  • the attachment of the part 76 requires a unique position of the powder-air supply tube which opens out inside said part.
  • the object of the invention is the construction of a gun which can be applied to powder coating materials of various colors and characteristics, including conductive pigments (metallic paint), having the particularity, in addition to fulfilling conditions of simplicity helping the change of color, or, in the case of wear of the spraying section, of ensuring complete separation from the transport and circulation section of the powder-air mixture to the spraying and electrostatic charge zone, relative to the source of generation of said electrostatic charge.
  • conductive pigments metallic paint
  • Said high voltage generator block placed in the body of the gun and advantageously formed by several independent modules (see EP 110 753, cited) comprises in combination an oscillator and a transformer which convert a direct current of low voltage, supplied to the gun through a low voltage conductive cable, at a high frequency intermediate voltage, and a voltage multiplier circuit which, in turn, transforms said high frequency current into a high voltage direct current for application to one or more field generating electrodes electrostatic.
  • the assembly proposes for this purpose the use of spray nozzles which can be replaced, very simple, easy to clean and of low cost, and therefore, easy to replace after a certain time of using them, or in the case of a color change (by providing, alternatively for cleaning, a nozzle for each color, for example), comprising a tubular body provided with a flange which abuts at the front end of the main body of the pistol and provided with a wick which extends it axially behind, and which fits, (or alternatively is screwed), into a housing of said pistol body, at the bottom of which there are means for the electrical connection to the high voltage source to generate the electrostatic field.
  • the tubular body of the nozzle has a first conduit of wide passage and of uniform section, which largely surrounds a fixed central rod, deflector holder and finished in a frustoconical flare.
  • a tubular section such as a screw connection, acting as connector for connection of the end of a flexible pipe for the circulation of the powder-air mixture to be sprayed which in this way has direct access to an area remote from the electrostatic charge generation block, and having free passage through this first, wide conduit, which is favored by the inclination of said lateral opening, the air-powder stream opening, at the end portion thereof, abutting against the deflector.
  • An electrode for electrostatic charge extends through the center of the rod completely electrically insulated, or along the walls of the tubular body, also made of electrically insulating material, according to two possible embodiments of the object of the invention, and emerges outside the first nozzle duct in the electrostatic spraying area.
  • the first conduit extends into a second axial conduit to said wick, with reduced passage, through which and adjusted under pressure is inserted the rear section of said insulating rod finished in a deflector body, also electrically insulating, which is arranged in front of the free, distal end of said wick of the tubular body, with the possibility of axial movement relative to the rod, to thus vary the amplitude of the spray field, by controlling the concentration of the electrostatic field produced by the electrode which is arranged near this zone, outside the body of the nozzle.
  • Said nozzle is fixed to the main body of the gun, in a possible implementation, by means of a nut member which is screwed, in a threaded section existing at the front end of said gun body.
  • the second conduit of the tubular body has a tubular sheath or cover, or a coating of its internal walls acting as a seal, when it is crossed with the deflector holder rod.
  • the nozzle explained will be subdivided into two half-pieces that can be coupled by screwing them, one carrying the first duct with its lateral opening and the second , comprising the drill bit for the connection to the body of the gun with a blind axial hole or right through, for fixing the end of the deflector holder rod.
  • Figure 1 is a side elevational view, with partial cross section of a gun, constructed according to the invention, and which includes as a characteristic part a nozzle which is illustrated in its mounting situation on the gun, and outside thereof ci, in two alternative implementations in FIGS. 1a and 1b, as well as coupling parts or fittings which couple to this nozzle, for connection of a pipe carrying the powder-air mixture.
  • Figure 2 is a sectional view of a possible implementation of the object of the invention, in which the high voltage generator block is formed by several sub-modules, inserted in an axial housing in the barrel of the barrel of the gun, such as described in the Spanish utility model No. 264765 cited.
  • Figure 3 illustrates an elevational view with partial section of the front section of the gun, with an alternative attachment of the deflector holder rod to the body of the nozzle.
  • FIG. 4 shows an elevation view of the gun, which includes a portion of the powder-air mixture supply pipe, connected to the body of the nozzle by a connection fitting, as described.
  • Figure 5 is a side elevational view, with partial cross section of a gun, constructed according to a variant of the invention with a hollow rod and a duct for the supply of air to its interior
  • the gun comprises a main body -30- made of electro-insulating material, which internally houses a set of elements linked together to generate the electrostatic field, supplied by a low voltage cable.
  • -31- i.e. a low to high voltage transformer -12-, associated with an oscillator (included or not inside the handle -37-), the output of this transformer -12- remaining connected to a high voltage multiplier --10-, -11-.
  • this transformer -12- forms a first module -32-, and the voltage multiplier a second module -19- mounted axially inside a tubular housing -18- of the pistol body, made of insulating material, so that they can be replaced separately, and remain delimited by a closing cover -25-, in accordance with the construction of the example of the utility model cited n o 264,765.
  • a cover -13- also allows access to the transformer -12-.
  • the multiplier -10-, - 11- is connected through a conductive cable -33- to a contact socket -8- (Fig.1), -20- (Fig.2), hence an electrode -1 -, -34- will take high-voltage current, said electrode being installed on the nozzle -4-via a conductor -1a- (Fig 1) axial to a rod -2- carrying a deflector -3- , both electrically insulating, or else via a conductor -23- (Fig 2) which extends through the walls of the nozzle -22-.
  • the invention proposes (see Figures 1a and 1b), a nozzle -4- (Fig 1), -22- (Fig.2), -50- (Fig.3) extremely simple, having a first conduit -41-, a second conduit -42- for fixing or passing the rod -2- carrying the deflector, the first conduit -41-having a lateral opening -43- for the connection of a coupling part, such as a connector, -14a-, -14b-, for connecting a flexible hose -35- for the circulation of the powder-air mixture, which arrives at said nozzle -4-, -22- - 50-, at a point distant from the high voltage current generation source, for the formation of the electrostatic field.
  • a coupling part such as a connector, -14a-, -14b-
  • the rod -2- in the implementation illustrated in Figure 1 is arranged through the conduit -42-, adjusted and, preferably, with the interposition of a seal -6- sealing-fixing and present at its distal end portion of the deflector, a threaded section -7-, conductive, forming a contact which is screwed and remains opposite, end-to-end, a second contact -8- which remains connected to the conductor - 33- which connects to the high voltage multiplier -10-, -11-.
  • FIG. 3 there is illustrated on a larger scale an alternative implementation of a nozzle -50 which can be replaced, as proposed by the invention, in which the rod -52- carrying, at its free end, the deflector -3- remains fixed by its internal end in a blind perforation -53- from the bottom of the second axial duct to the body of the nozzle; we can see the coupling piece or fitting -54- connected to the lateral opening, the electrodes -51- which are connected, through the conductor -56- to contacts -59- opposite a conductive ring - 55-.
  • the section of the wick (44) coupling to the gun body -30- includes a threaded portion -57- which couples by screwing it into the housing -58- before the gun body -30-, also internally threaded inside.
  • the part -49- coaxial with the nozzle, having an internal thread -60-, is screwed on the front section of the body of the gun and retains a flange -61- of the body of the nozzle serving as a stop.
  • the parts -5-, -49-could be a simple socket coaxially coupled, the section -48- screwed from its rear wick -44-coupling making l 'office connecting the nozzle to the gun body.
  • the design of the cited nozzle is extremely simple and inexpensive, and its assembly or replacement involves only the manipulation of the nut -5- -49-, (or possibly unscrew the nozzle -22-, -50) and we can therefore use a nozzle for each color or replace it in the case of wear after a certain time of use.
  • the nozzle is made according to the example of FIG. 1b, that is to say by means of two half-pieces -4a- and -4b-couplable by screwing, the only part to be replaced, for the replacement or cleaning, will be that of before -4a-constituted by a simple hose with an inclined lateral opening -43-, greatly simplifying the maintenance costs of the gun.
  • the gun incorporates a rod -36- to fix a part of the body of the pipe -35-, near the base of the handle -37- of the gun.
  • the wick -44- at the rear of the body of the nozzle -22- which couples to the body of the gun includes, as in FIG. 3, a threaded section -21- which is screwed in a front recess of the gun body where the connectors -26- are defined for the connection of the electrodes -34-.
  • FIG. 5 shows an alternative embodiment of the gun according to the invention which comprises an independent pipe -39 for supplying pressurized air, which passes through the body of the gun -30- and is connected end to end through a electrical contact element -8- with the rear end of a hollow rod -29-, support for a deflector (3), with an electrode (1) axial to the central conduit - 39- opening into the extreme zone of the rod -29-beyond the deflector cone -3-.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
EP19930500006 1992-01-22 1993-01-22 Pistolet pour pulvérisation électrostatique de matériaux en poudre de diverses couleurs et caractéristiques Expired - Lifetime EP0553052B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9200131 1992-01-22
ES9200131A ES2053369B1 (es) 1992-01-22 1992-01-22 Pistola para pulverizacion electrostatica de material en polvo de distintos colores y diferentes caracteristicas.

Publications (2)

Publication Number Publication Date
EP0553052A1 EP0553052A1 (fr) 1993-07-28
EP0553052B1 true EP0553052B1 (fr) 1996-12-18

Family

ID=8275816

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930500006 Expired - Lifetime EP0553052B1 (fr) 1992-01-22 1993-01-22 Pistolet pour pulvérisation électrostatique de matériaux en poudre de diverses couleurs et caractéristiques

Country Status (2)

Country Link
EP (1) EP0553052B1 (Direct)
ES (2) ES2053369B1 (Direct)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6796519B1 (en) 1999-09-16 2004-09-28 Nordson Corporation Powder spray gun

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19623367C1 (de) * 1996-06-12 1997-11-06 Gema Volstatic Ag Pulver-Sprühbeschichtungsvorrichtung
EP2050506A1 (en) * 2007-10-19 2009-04-22 Boxal Netherlands B.V. Powder coating spraying apparatus
CN111299000A (zh) * 2020-03-12 2020-06-19 宁波西敦医药包衣科技有限公司 一种干粉包衣静电喷粉系统
CN114134497B (zh) * 2021-11-30 2024-01-26 中冶京诚工程技术有限公司 一种用于喷涂粉末的喷嘴及喷涂装置
CN115608530B (zh) * 2022-09-28 2023-09-05 广东水电二局股份有限公司 一种大直径钢管熔喷防腐用阵列式喷头

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598871A (en) * 1984-05-10 1986-07-08 Nordson Corporation Multiple process electrostatic spray gun having integral power supply
US4815666A (en) * 1987-09-21 1989-03-28 Nordson Corporation Powder spray gun for quick color changes systems
US5056720A (en) * 1990-09-19 1991-10-15 Nordson Corporation Electrostatic spray gun

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6796519B1 (en) 1999-09-16 2004-09-28 Nordson Corporation Powder spray gun

Also Published As

Publication number Publication date
ES2053369A2 (es) 1994-07-16
EP0553052A1 (fr) 1993-07-28
ES2053369B1 (es) 1998-05-01
ES2097479T3 (es) 1997-04-01
ES2053369R (Direct) 1997-05-16

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