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EP0110069A1 - Appareil d'application électrostatique d'un enduit sur des objets - Google Patents

Appareil d'application électrostatique d'un enduit sur des objets Download PDF

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Publication number
EP0110069A1
EP0110069A1 EP83110106A EP83110106A EP0110069A1 EP 0110069 A1 EP0110069 A1 EP 0110069A1 EP 83110106 A EP83110106 A EP 83110106A EP 83110106 A EP83110106 A EP 83110106A EP 0110069 A1 EP0110069 A1 EP 0110069A1
Authority
EP
European Patent Office
Prior art keywords
transformer
channel
voltage
spraying device
coating material
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.)
Granted
Application number
EP83110106A
Other languages
German (de)
English (en)
Other versions
EP0110069B1 (fr
Inventor
Guido Rutz
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
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 Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Priority to AT83110106T priority Critical patent/ATE19478T1/de
Publication of EP0110069A1 publication Critical patent/EP0110069A1/fr
Application granted granted Critical
Publication of EP0110069B1 publication Critical patent/EP0110069B1/fr
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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material

Definitions

  • the invention relates to a spraying device for the electrostatic coating of objects with coating material, in particular with powdery coating material, which has an elongated body through which a channel for the coating material leads in the longitudinal direction to a discharge opening emanating from the body, with an electrical transformer which has a rod-shaped Has core and at least one surrounding primary winding and secondary winding, the transformer being housed axially parallel to the channel in the body outside the channel, with at least one electrode carried by the body for electrostatic charging of the coating material passed through the channel and the discharge opening, with an im Body housed, the transformer with the electrodes, electrical voltage multiplication and rectification circuit, and with an electrical connection device for connecting the primary winding the transformer to a power source.
  • Such spraying devices have been put on the market by the applicant of the present patent application for some time.
  • the US-PS 3 608 823 which corresponds essentially to DE-PS 20 65 699, shows a pistol-shaped spraying device, at the upstream rear end of which an annular transformer concentrically surrounds the coating material channel. Furthermore, voltage multiplication and rectification circuits are described in this document, once in the form of a voltage multiplier cascade and once in the form of a voltage divider. The components of this circuit are evenly distributed around the channel.
  • DE-OS 30 08 843 shows a pistol-shaped spraying device in which an oscillator fed with low DC voltage, a transformer and a cascade circuit are each designed as hollow cylindrical, ring-shaped structural units and surround the coating material channel concentrically.
  • concentrically surrounding assemblies can have disadvantageous electrical and Generate magnetic field effects must be made to order and can only be used for a certain size of a sprayer, while the use of commercially available electrical components would be much cheaper.
  • US Pat. No. 3,731,145 shows a pistol-shaped spraying device with a unit made up of a transformer and a direct current / alternating current converter, which is accommodated in the upstream end, and a voltage multiplier unit arranged above the coating material channel.
  • the transformer has a pot core.
  • US Pat. No. 4,196,475 shows a pistol-shaped spraying device which essentially consists of two components which are arranged axially parallel one above the other and are detachable from one another.
  • the coating material channel leads through the upper component.
  • the lower component contains the electrical components for voltage generation for the electrodes, which are used to electrostatically charge the coating material. They essentially consist of an oscillator for converting the DC voltage of a voltage source into an AC voltage, a downstream transformer for stepping up the oscillator voltage to a medium high voltage, a multi-stage cascade circuit connected to the secondary winding of the transformer for further stepping up and converting the voltage to a certain high DC voltage value, which is supplied to the electrodes.
  • the invention aims to solve the problem of making the thickness of the elongated spray device so small that the spray device can also be inserted into narrow interiors of hollow bodies in order to coat their inner surfaces, the spray device should be structurally simple and inexpensive to manufacture , result in a high quality coating and should meet high requirements for electrical safety and a long service life. In view of this, commercially available electrical components should be able to be used as far as possible and heat accumulations in the device must be avoided.
  • the invention represents a compromise between a transformer with a closed magnetic circuit and a rod transformer with an open magnetic circuit.
  • the two magnetic conductor rods arranged parallel to the rod core preferably cast into the cast plastic body of the spraying device, take over most of the magnetic force flow of the rod transformer and in this way make it insensitive to external influences.
  • These external influences are in particular the tubular hollow bodies to be coated, which normally consist of metal.
  • the remaining large gap or jump in the magnetic line of force between the rod-shaped core of the transformer and the magnetic conductor rods practically does not influence the performance of the transformer, but on the contrary, it helps to avoid the negative technical effects which are present with closed transformers. For example, such a gap or jump serves to reduce the saturation of the transformer.
  • the magnetic conductor rods absorb the magnetic flux of the transformer magnetic field. This prevents the magnetic field from flowing onto these objects when coating interiors of narrow objects. A drain on the objects to be coated is disadvantageous because the magnetic flux then depends on the distance of the object from the transformer. A close distance results in a sharp drop in voltage and increased current consumption by the transformer.
  • the rod-shaped spraying device 32 from FIG. 1, which is designed according to the invention, has been inserted into a tubular object 34 in order to coat its inner jacket wall (36) with powdery coating material.
  • the elongated body 38 of the spraying device 32 essentially consists of a plastic part 40, for example of Delrin, and an axially molded part 42 made of plastic.
  • a pipe 44 leads through the elongated body 38 and leads the powdery coating material, which is transported in a manner known per se by a gas stream, from an inlet opening 46 to a discharge opening 48 of the body 38.
  • a funnel-shaped nozzle opening 50 for baffle-free atomization of the coating material adjoins the discharge opening 48.
  • the nozzle opening 50 is formed in a mouthpiece 52 which is attached to the discharge opening 48 on the molded-on plastic part 42 of the body 38.
  • An electrical transformer 54 is cast into the molded plastic part 42 and has a rod-shaped core 56 and at least one primary winding 58 surrounding each and a secondary winding 60 wound over the primary winding.
  • the rod transformer 54 is shown schematically in more detail in FIG. 6 than in FIG. 1.
  • the transformer is axially parallel to the channel 45 in the plastic part 42 above the channel 45 below brought.
  • a rod transformer 54 has the advantage over all other transformers that it is much smaller and therefore requires much less space.
  • the magnetic field collecting magnetic conductor rods 62 In the magnetic field of the transformer 54 are parallel to its rod core outside the primary and secondary windings 58 and 60 at least two, the magnetic field collecting magnetic conductor rods 62, preferably ferrite cores, around the circumference of the rod core 56 at a distance from each other, which essentially over the extend the entire length of the rod core 56.
  • the ferrite cores 62 are essentially of the same length as the rod core 56.
  • the ferrite cores 62 are relative to the central axis 64 of the Rod core 62 as an angular tip, arranged on the side of the transformer 54 facing away from the channel 45 at an angular distance 66 of less than 180 °. This is particularly evident from FIGS. 1 and 2.
  • the ferrite cores 62 can also be arranged at a distance of 180 ° from one another are, or at an even larger distance angle, however, the larger the angle distance 66 is made, the worse the magnetic field is shielded against the object 34 to be coated.
  • the heat dissipation to the outside is more favorable if the ferrite cores 62 are not arranged too close to one another.
  • Four electrodes 70 for example, protrude into the channel 45 at the discharge opening 48 and are cast into the plastic part 42 of the body 38.
  • a so-called Greinacher circuit (named after the inventor Mr. Greinacher) is cast into the molded plastic part 42 as a voltage multiplication and rectification circuit 72.
  • the input of the circuit 72 is connected to the secondary winding 60 of the transformer 54 via a series resistor 74.
  • the output of the circuit 72 is given by two different voltage levels, each of which is connected via a protective resistor 76 to two electrodes 70, each offset by 90 °.
  • Such a circuit is known per se and is also shown, for example, in FIG. 7.
  • the circuit 72 essentially consists of capacitors 78 and diodes 80, which are arranged evenly distributed around the channel 45 and are connected to one another via lines in accordance with FIG. 7, as is shown schematically in FIG.
  • All electrical parts are thus uniformly arranged around the channel 45 and cast into the plastic part 42, with only one connecting device 82, which is designed as a plug unit and serves to connect the primary winding 58 of the transformer 54 to a power source, in a recess 84 in the upstream plastic part 40 is housed.
  • the body 38 has an essentially cylindrical outer shape for the cylinder thereof Axis 86 of the channel 45 and its discharge opening 48 are arranged eccentrically offset with their axis 88, while the transformer is arranged eccentrically to the cylinder axis 86 with respect to its central axis 64 on the other side.
  • the spraying device 32 has an essentially cylindrical outer shape in accordance with FIGS. 1, 2 and 3.
  • the most advantageous is a circular cross section according to FIGS. 2 and 3. Minor modifications of this in the form of a polygon are of course possible.
  • a modification of the cross-sectional outer shape according to FIG. 4 is also possible, that is to say a circular outer shape with flattened side surfaces running parallel to one another.
  • FIG. 5 shows a further embodiment of a spray device 92 in the form of a hand gun.
  • a handle 94 and no mouthpiece is connected to the discharge opening 48, but a baffle plate 96 is arranged downstream for atomizing the coating material.
  • electrodes 98 can be provided which protrude axially at the edge of the discharge opening 48 and electrostatically charge the coating material emerging from the discharge opening 48 while it is being swirled by the baffle plate 96.
  • the baffle 96 can between the position drawn in solid lines and the position drawn in dashed lines can be adjusted axially, as is known per se.
  • the embodiment according to FIG. 5 corresponds to that of FIGS. 1 to 3 with regard to the remaining design and also in particular with regard to the electrical parts.
  • An external voltage source can be connected to the plug unit 82 of FIG. 1 via a cable, which, for example, supplies 10 volts at 17 kHz.
  • This voltage passes from the plug unit 82 to the primary winding 58 of the transformer 54, which has a rod-shaped core 56 in the manner mentioned and is shown in an exploded view in FIG. 6.
  • the secondary winding 60 of the rod transformer 54 outputs a voltage of, for example, 5 kV 17 kHz via the protective resistor 74 to the input of the voltage multiplication and rectification circuit 72.
  • the circuit 72 is a Greinacher cascade circuit in the manner mentioned, at the end of which one or 7, two different DC voltages of approximately 70 kV are taken and applied to the electrodes 70 of FIG.
  • the possible range of this high voltage is between approximately 40 kV and 150 kV.
  • the use of two slightly different voltage potentials for the electrodes causes an eccentrically distributed electrostatic field to be generated in the channel 45, which is favorable for the electrostatic charging of the coating material in a known manner.
  • connection device 82 can contain a voltage converter designed in accordance with FIG. 7, to which a DC voltage of, for example, 12 V from an external DC voltage source is connected.
  • a DC voltage of, for example, 12 V from an external DC voltage source is connected.
  • an embodiment with two primary windings corresponding to FIG. 7 must be selected as the transformer 54, but this also contains a rod-shaped magnetic core, around which the windings are wound.
  • connection device 82 can be a plug unit for an external direct voltage or alternating voltage source, while the rod-shaped transformer 54 is part of a high-voltage generator 98, the different output voltages for the electrodes being generated by a voltage divider according to FIG.
  • the individual voltage stages of the voltage multiplication and rectification circuit according to FIGS. 7 and 8 are designated by the reference numerals 1, 2, 3, 4, 5 and 6 as well as la, 2a, 3a, 4a, 5a and 6a.
  • FIGS. 1, 2, 3 and 6 g The essential thing is always the use of a rod transformer and the essentially cylindrical design of the spraying device, whether exactly circular or in the form of a polygon, the entire spraying device, with the exception of a handle that may be used, not having any radial elevations that expand the cylindrical shape laterally.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electrostatic Spraying Apparatus (AREA)
EP83110106A 1982-11-24 1983-10-11 Appareil d'application électrostatique d'un enduit sur des objets Expired EP0110069B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83110106T ATE19478T1 (de) 1982-11-24 1983-10-11 Spritzvorrichtung zum elektrostatischen beschichten von gegenstaenden mit beschichtungsmaterial.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3243447A DE3243447C2 (de) 1982-11-24 1982-11-24 Spritzvorrichtung zum elektrostatischen Beschichten von Gegenständen mit Beschichtungsmaterial
DE3243447 1982-11-24

Publications (2)

Publication Number Publication Date
EP0110069A1 true EP0110069A1 (fr) 1984-06-13
EP0110069B1 EP0110069B1 (fr) 1986-04-30

Family

ID=6178908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110106A Expired EP0110069B1 (fr) 1982-11-24 1983-10-11 Appareil d'application électrostatique d'un enduit sur des objets

Country Status (5)

Country Link
US (1) US4529131A (fr)
EP (1) EP0110069B1 (fr)
JP (1) JPS59105863A (fr)
AT (1) ATE19478T1 (fr)
DE (1) DE3243447C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996011062A1 (fr) * 1994-10-11 1996-04-18 Imperial Chemical Industries Plc Generateur de haute tension
RU2160169C2 (ru) * 1996-02-29 2000-12-10 Дзе Проктер Энд Гэмбл Компани Электростатическое распыляющее устройство

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4020289C1 (fr) * 1990-06-26 1991-12-12 Wagner International Ag, Altstaetten, Ch
DE4227455C2 (de) * 1992-08-19 1996-04-04 Wagner Int Vorrichtung zum elektrostatischen Nachbeschichten der Innenflächen von Schweißnähten
US5850976A (en) * 1997-10-23 1998-12-22 The Eastwood Company Powder coating application gun and method for using the same
DK1842898T3 (da) * 1999-07-22 2012-08-13 Diversey Inc Anvendelse af en smøremiddelsammensætning til at smøre et transportbælte
US6576298B2 (en) * 2000-09-07 2003-06-10 Ecolab Inc. Lubricant qualified for contact with a composition suitable for human consumption including a food, a conveyor lubrication method and an apparatus using droplets or a spray of liquid lubricant
US6467705B2 (en) 2001-01-29 2002-10-22 The Easthill Group, Inc. Tribo-corona powder application gun
DE10150759B4 (de) * 2001-10-13 2019-02-14 Gema Switzerland Gmbh Pulverspritzpistole für Beschichtungspulver
US7296760B2 (en) * 2004-11-17 2007-11-20 Illinois Tool Works Inc. Indexing valve
US7296759B2 (en) * 2004-11-19 2007-11-20 Illinois Tool Works Inc. Ratcheting retaining ring
US20060202060A1 (en) * 2004-12-06 2006-09-14 Alexander Kevin L Dispensing device handle assembly
US7757973B2 (en) 2005-04-04 2010-07-20 Illinois Tool Works Inc. Hand-held coating dispensing device
US7460924B2 (en) * 2005-06-16 2008-12-02 Illinois Tool Works Inc. In-gun power supply control
US7364098B2 (en) * 2005-10-12 2008-04-29 Illinois Tool Works Inc. Material dispensing apparatus
US7621471B2 (en) * 2005-12-16 2009-11-24 Illinois Tool Works Inc. High voltage module with gas dielectric medium or vacuum
USD545943S1 (en) 2006-03-14 2007-07-03 Illinois Tool Works Inc. Coating material dispensing device
US7455249B2 (en) 2006-03-28 2008-11-25 Illinois Tool Works Inc. Combined direct and indirect charging system for electrostatically-aided coating system
US7926748B2 (en) 2008-03-10 2011-04-19 Illinois Tool Works Inc. Generator for air-powered electrostatically aided coating dispensing device
US8016213B2 (en) 2008-03-10 2011-09-13 Illinois Tool Works Inc. Controlling temperature in air-powered electrostatically aided coating material atomizer
US8590817B2 (en) 2008-03-10 2013-11-26 Illinois Tool Works Inc. Sealed electrical source for air-powered electrostatic atomizing and dispensing device
USD608858S1 (en) 2008-03-10 2010-01-26 Illinois Tool Works Inc. Coating material dispensing device
US8770496B2 (en) 2008-03-10 2014-07-08 Finishing Brands Holdings Inc. Circuit for displaying the relative voltage at the output electrode of an electrostatically aided coating material atomizer
US7988075B2 (en) 2008-03-10 2011-08-02 Illinois Tool Works Inc. Circuit board configuration for air-powered electrostatically aided coating material atomizer
US8496194B2 (en) 2008-03-10 2013-07-30 Finishing Brands Holdings Inc. Method and apparatus for retaining highly torqued fittings in molded resin or polymer housing
US7918409B2 (en) * 2008-04-09 2011-04-05 Illinois Tool Works Inc. Multiple charging electrode
US8225968B2 (en) * 2009-05-12 2012-07-24 Illinois Tool Works Inc. Seal system for gear pumps

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB880815A (en) * 1960-08-16 1961-10-25 Thorn Electrical Ind Ltd Improvements in or relating to electrical inductors
US3883246A (en) * 1972-01-25 1975-05-13 Bicosa Recherches Electronic device adapted to produce high voltage-pulses, especially for igniting a gas lighter
US4120016A (en) * 1976-11-05 1978-10-10 Ppg Industries, Inc. Detachable cylindrical power supply for induction type electrostatic spray gun
US4120017A (en) * 1976-11-05 1978-10-10 Ppg Industries, Inc. Detachable power supply for induction type electrostatic spray gun
GB2009625A (en) * 1977-12-08 1979-06-20 Gema Ag Electrostatic powder coating gun

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH496481A (de) * 1969-06-25 1970-09-30 Gema Ag App Bau Vorrichtung zum elektrostatischen Beschichten von Gegenständen mit zerstäubten Feststoffpartikeln
US3731145A (en) * 1970-11-23 1973-05-01 Nordson Corp Electrostatic spray gun with self-contained miniaturized power pack integral therewith
CH620600A5 (fr) * 1977-05-12 1980-12-15 Alex Hengartner
FR2424068A1 (fr) * 1978-04-28 1979-11-23 Wagner J Ag Pistolet pulverisateur electrostatique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB880815A (en) * 1960-08-16 1961-10-25 Thorn Electrical Ind Ltd Improvements in or relating to electrical inductors
US3883246A (en) * 1972-01-25 1975-05-13 Bicosa Recherches Electronic device adapted to produce high voltage-pulses, especially for igniting a gas lighter
US4120016A (en) * 1976-11-05 1978-10-10 Ppg Industries, Inc. Detachable cylindrical power supply for induction type electrostatic spray gun
US4120017A (en) * 1976-11-05 1978-10-10 Ppg Industries, Inc. Detachable power supply for induction type electrostatic spray gun
GB2009625A (en) * 1977-12-08 1979-06-20 Gema Ag Electrostatic powder coating gun

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996011062A1 (fr) * 1994-10-11 1996-04-18 Imperial Chemical Industries Plc Generateur de haute tension
US5992771A (en) * 1994-10-11 1999-11-30 The Procter & Gamble Company High voltage generator
RU2160169C2 (ru) * 1996-02-29 2000-12-10 Дзе Проктер Энд Гэмбл Компани Электростатическое распыляющее устройство

Also Published As

Publication number Publication date
US4529131A (en) 1985-07-16
EP0110069B1 (fr) 1986-04-30
ATE19478T1 (de) 1986-05-15
DE3243447A1 (de) 1984-06-07
JPS59105863A (ja) 1984-06-19
DE3243447C2 (de) 1984-09-20

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