EP0547397B1 - Electrostatic powder coating gun - Google Patents

Electrostatic powder coating gun Download PDF

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Publication number
EP0547397B1
EP0547397B1 EP92119738A EP92119738A EP0547397B1 EP 0547397 B1 EP0547397 B1 EP 0547397B1 EP 92119738 A EP92119738 A EP 92119738A EP 92119738 A EP92119738 A EP 92119738A EP 0547397 B1 EP0547397 B1 EP 0547397B1
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EP
European Patent Office
Prior art keywords
powder
high voltage
duct
electrode
barrel
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
EP92119738A
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German (de)
French (fr)
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EP0547397A1 (en
Inventor
Radovan Talacko
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Wagner International AG
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Wagner International AG
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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
    • B05B5/0531—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 invention relates to an electrostatic powder coating gun according to the preamble of patent claim 1.
  • the powder-air mixture is fed through the handle or adjacent to the handle, the powder channel then being guided through the entire length of the gun barrel.
  • the high-voltage generator sits parallel to the powder channel, be it in or on the handle or in or on the gun barrel.
  • this results in a long flow path for the powder-air mixture within the gun, so that a high pressure is required for the air conveying the powder in order to overcome the flow resistance in the gun.
  • the flow through the long powder channel results in a comparatively high wear of parts due to abrasion.
  • the juxtaposition of the powder duct and the high-voltage generator means that either the handle or the gun barrel must be dimensioned comparatively large.
  • the object of the present invention is to provide an electrostatic powder coating gun in which the flow path of the powder-air mixture within the gun is comparatively short, so that flow resistance and abrasion are reduced, and the handle and gun barrel can be made slim.
  • the solution to this problem results from the characterizing features of patent claim 1.
  • the powder channel is very short and only occupies the foremost area of the gun barrel.
  • the formation of the powder channel as a torus with a tangential junction of the powder-air mixture supply and with a diffuser tube piece adjoining the torus results in particularly favorable flow conditions.
  • the consequence of these measures is that the pressure of the conveying air is comparatively low and the abrasion on the channel wall is extremely low.
  • the space in the gun tube behind the powder channel is fully available to the high-voltage generator, so that the gun barrel can be made very slim; the same applies to the pistol grip if it is a manual pistol.
  • the area of the walls on which powder particles can be deposited is reduced and the deposition of powder particles is additionally minimized by the tangential flow with an inclined position.
  • a particularly useful development of the invention is characterized in claim 2.
  • the high-voltage generator is flushed with compressed air so that static charges do not occur, and this flushing air then still serves to keep the electrode free of powder deposits.
  • the foremost region of the gun barrel 10 of the electrostatic powder coating gun according to the invention shown in FIG. 1 consists of the barrel main part 10a and the barrel extension 10b screwed onto its mouth part.
  • the barrel main part 10a is closed at its mouth end by a cover wall 12 which is integral with the barrel, the cover wall 12 having a central bore 12a into which an electrode support tube 13 projecting forward is tightly inserted.
  • a central high-voltage generator 14 is located in the barrel main part, the outside diameter of which is slightly smaller than the inside diameter of the tubular barrel main part 10 a, such that an annular gap 15 remains free.
  • the high-voltage generator 14 has spacer feet 14a, which ensure that a gap 16 remains free between the front end of the high-voltage generator 14 and the top wall 12, which is on the one hand with the annular gap 15 and on the other hand with the interior 13a of the electrode support tube 13 in open connection.
  • the barrel extension 10b has essentially the shape of a cylinder, the rear part of which is designed as a tubular piece spanning the barrel main part 10a; this piece of pipe has an internal thread, with the aid of which the barrel extension 10b can be screwed onto the external thread of the barrel main part 10a. Furthermore, the barrel extension 10b has a central inner bore, through which the electrode support tube 13 is passed axially to the front. In the middle region of the barrel extension 10b, a torus powder channel 17 is cut into the concentrically surrounding the electrode support tube 13, which continues in the forward direction into a ring powder channel 18, which diffuses like a widening on the front forehead of the extension 10b opens outwards. An inlet nozzle 19, into which a feed tube (not shown) for the powder-air mixture can be connected, opens into the torus powder duct 17 tangentially and with a sloping position in the forward direction.
  • the powder coating gun works as follows. About the supply hose, not shown, a powder-air mixture is introduced in the direction of arrow B through the connecting piece 19 spirally tangentially into the torus powder channel 17, from which the mixture reaches the annular channel 18 and flows through it to the outside . Due to the diffuser-like expansion of the ring channel 18 and the action of the impact body 20, a powder cloud that rises very early is generated, which favors both the charging and the transport of the powder. The powder is charged by the electrode 21, which, as mentioned, is connected to high voltage. Compressed air is supplied as purging air from the rear region of the coating gun, not shown, in the direction of arrows A.
  • This purging air passes through the annular gap 15 and passes through the end gap 16 and the interior of the electrode carrier tube 13 into the channels 22, which are there as fine air jets surrounding the electrode 21. This purging air ensures that static charges are dissipated in the area of the gaps 15, 16 and that they are kept clean in the area of the electrode 21.
  • Fig. 3 shows a modification for the achievement of a powder flat jet.
  • the orifice ring 24 used there is replaced by a cap 30 with a slot nozzle 31 through which the electrode needle 21 projects.
  • the impact body 20 is also omitted in this embodiment.
  • the compressed air emerging from the interior of the electrode support tube 13 and washing around the electrode needle 21 is of great importance, because here it not only prevents contamination of the electrode needle, but above all prevents the nozzle slot 31 from becoming clogged.
  • the gun barrel 10 consists of two detachable parts, namely the main part 10a and the extension 10b; Compared to a one-piece gun barrel, however, the subdivision shown gives the advantages of easier manufacture and, above all, easier disassembly and cleaning of the gun.
  • the annular channel 18 can also have a constant diameter over its entire length, even narrow towards the mouth.
  • the high-voltage generator 14 can also only be the final stage (cascade) of the generator circuit.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Description

Die Erfindung betrifft eine elektrostatische Pulver-Beschichtungspistole nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an electrostatic powder coating gun according to the preamble of patent claim 1.

Bei bekannten Beschichtungspistolen wird das Pulver-Luft-Gemisch durch den Handgriff oder benachbart dem Handgriff zugeführt, wobei dann der Pulverkanal durch die gesamte Länge des Pistolenlaufs geführt ist. Der Hochspannungserzeuger sitzt dabei parallel zum Pulverkanal, sei es im oder am Handgriff oder im oder am Pistolenlauf. Damit ergibt sich aber für das Pulver-Luft-Gemisch innerhalb der Pistole ein langer Strömungsweg, so daß für die das Pulver fördernde Luft ein hoher Druck erforderlich ist, um den Strömungswiderstand in der Pistole zu überwinden. Außerdem ergibt sich durch die Durchströmung des langen Pulverkanals ein vergleichsweise hoher Teileverschleiß durch Abrieb. Schließlich führt die Nebeneinanderanordnung von Pulverkanal und Hochspannungserzeuger dazu, daß entweder der Handgriff oder der Pistolenlauf vergleichsweise groß dimensioniert werden muß.In known coating guns, the powder-air mixture is fed through the handle or adjacent to the handle, the powder channel then being guided through the entire length of the gun barrel. The high-voltage generator sits parallel to the powder channel, be it in or on the handle or in or on the gun barrel. However, this results in a long flow path for the powder-air mixture within the gun, so that a high pressure is required for the air conveying the powder in order to overcome the flow resistance in the gun. In addition, the flow through the long powder channel results in a comparatively high wear of parts due to abrasion. Finally, the juxtaposition of the powder duct and the high-voltage generator means that either the handle or the gun barrel must be dimensioned comparatively large.

Bei einer bekannten Beschichtungspistole mit den Merkmalen des Oberbegriffs des Patentanspruchs 1 (US-A-5 056 720) mündet die Zufuhrung für Beschichtungsmaterial zentral mit Schräganstellung in einen zum Elektroden-Trägerrohr koaxialen, zum Werkstück hin offenen Ringkanal.In a known coating gun with the features of the preamble of claim 1 (US-A-5 056 720) opens out Central feed for coating material with inclined position in an annular channel coaxial to the electrode carrier tube and open to the workpiece.

Aufgabe der vorliegenden Erfindung ist es, eine elektrostatische Pulver-Beschichtungspistole zu schaffen, bei welcher der Strömungsweg des Pulver-Luft-Gemisches innerhalb der Pistole vergleichsweise kurz ist, so daß Strömungswiderstand und Abrieb vermindert sind, und deren Handgriff und Pistolenrohr schlank ausgelegt werden können. Die Lösung dieser Aufgabe ergibt sich aus den kennzeichnenden Merkmalen des Patentanspruchs 1.The object of the present invention is to provide an electrostatic powder coating gun in which the flow path of the powder-air mixture within the gun is comparatively short, so that flow resistance and abrasion are reduced, and the handle and gun barrel can be made slim. The solution to this problem results from the characterizing features of patent claim 1.

Bei der erfindungsgemäßen Pulver-Beschichtungspistole ist der Pulverkanal sehr kurz und beansprucht nur den vordersten Bereich des Pistolenlaufs. Durch die Ausbildung des Pulverkanals als Torus mit tangentialer Einmündung der Pulver-Luftgemisch-Zuführung und mit sich an den Torus anschließendem Diffusor-Rohrstück ergeben sich besonders günstige Strömungsverhältnisse. Die Folge dieser Maßnahmen ist, daß mit einem vergleichsweise geringen Druck der Förderluft auszukommen und der Abrieb an der Kanalwandung äußerst gering ist. Der Raum im Pistolenrohr hinter dem Pulverkanal steht voll dem Hochspannungserzeuger zur Verfügung, so daß der Pistolenlauf sehr schlank ausgebildet werden kann; dasselbe gilt, wenn es sich um eine Handpistole handelt, für den Pistolengriff. Außerdem wird die Fläche der Wandungen, an denen sich Pulverteilchen ablagern können, vermindert und durch die Tangentialströmung mit Schräganstellung die Ablagerung von Pulverteilchen zusätzlich minimiert.In the powder coating gun according to the invention, the powder channel is very short and only occupies the foremost area of the gun barrel. The formation of the powder channel as a torus with a tangential junction of the powder-air mixture supply and with a diffuser tube piece adjoining the torus results in particularly favorable flow conditions. The consequence of these measures is that the pressure of the conveying air is comparatively low and the abrasion on the channel wall is extremely low. The space in the gun tube behind the powder channel is fully available to the high-voltage generator, so that the gun barrel can be made very slim; the same applies to the pistol grip if it is a manual pistol. In addition, the area of the walls on which powder particles can be deposited is reduced and the deposition of powder particles is additionally minimized by the tangential flow with an inclined position.

Eine besonders zweckmäßige Weiterbildung der Erfindung ist im Patentanspruch 2 gekennzeichnet. Dabei wird der Hochspannungserzeuger von Druckluft umspült, so daß es nicht zu statischen Aufladungen kommt, und diese Spülluft dient dann noch zum Freihalten der Elektrode von Pulverablagerungen.A particularly useful development of the invention is characterized in claim 2. The high-voltage generator is flushed with compressed air so that static charges do not occur, and this flushing air then still serves to keep the electrode free of powder deposits.

Auf der Zeichnung sind Ausführungsformen der Erfindung beispielsweise dargestellt. Es zeigen:

Fig. 1
einen Längsschnitt durch den vorderen Bereich der Pulver-Beschichtungspistole,
Fig. 2
einen Querschnitt nach der Linie II-II von Fig. 1 und
Fig. 3
einen Teil-Längsschnitt einer Abwandlungsform der Pulver-Beschichtungspistole von Fig. 1.
Embodiments of the invention are shown in the drawing, for example. Show it:
Fig. 1
a longitudinal section through the front area of the powder coating gun,
Fig. 2
a cross-section along the line II-II of Fig. 1 and
Fig. 3
2 shows a partial longitudinal section of a modification of the powder coating gun from FIG. 1.

Der in Fig. 1 dargestellte vorderste Bereich des Pistolenlaufs 10 der elektrostatischen Pulver-Beschichtungspistole nach der Erfindung besteht aus dem Lauf-Hauptteil 10a und dem auf dessen Mündungsteil aufgeschraubtem Lauf-Fortsatz 10b. Der Lauf-Hauptteil 10a ist an seiner Mündungsstirn durch eine mit dem Laufrohr einstückige Deckelwand 12 abgeschlossen, wobei die Deckelwand 12 eine Mittelbohrung 12a besitzt, in die ein nach vorne ragendes Elektroden-Trägerrohr 13 dicht eingesetzt ist. Im Lauf-Hauptteil befindet sich zentral ein Hochspannungserzeuger 14, dessen Außendurchmesser geringfügig kleiner ist als der Innendurchmesser des rohrförmigen Lauf-Hauptteils 10a, derart, daß ein Ringspalt 15 frei bleibt. Der Hochspannungserzeuger 14 weist Abstandhalter-Füße 14a auf, die dafür sorgen, daß zwischen Vorderstirn des Hochspannungserzeugers 14 und Deckelwand 12 ein Spalt 16 freibleibt, der einerseits mit dem Ringspalt 15 und andererseits mit dem Innenraum 13a des Elektroden-Trägerrohrs 13 in offener Verbindung steht.The foremost region of the gun barrel 10 of the electrostatic powder coating gun according to the invention shown in FIG. 1 consists of the barrel main part 10a and the barrel extension 10b screwed onto its mouth part. The barrel main part 10a is closed at its mouth end by a cover wall 12 which is integral with the barrel, the cover wall 12 having a central bore 12a into which an electrode support tube 13 projecting forward is tightly inserted. A central high-voltage generator 14 is located in the barrel main part, the outside diameter of which is slightly smaller than the inside diameter of the tubular barrel main part 10 a, such that an annular gap 15 remains free. The high-voltage generator 14 has spacer feet 14a, which ensure that a gap 16 remains free between the front end of the high-voltage generator 14 and the top wall 12, which is on the one hand with the annular gap 15 and on the other hand with the interior 13a of the electrode support tube 13 in open connection.

Der Lauf-Fortsatz 10b hat in wesentlichen die Form eines Zylinders, dessen hinterer Teil als das Lauf-Hauptteil 10a übergreifendes Rohrstück ausgebildet ist; dabei besitzt dieses Rohrstück ein Innengewinde, mit dessen Hilfe der Lauf-Fortsatz 10b auf das Außengewinde des Lauf-Hauptteils 10a aufschraubbar ist. Weiterhin weist der Lauf-Fortsatz 10b eine zentrale Innenbohrung auf, durch welche das Elektroden-Trägerrohr 13 nach vorne axial hindurchgeführt ist. Im Mittelbereich des Lauf-Fortsatzes 10b ist in diesen ein das Elektroden-Trägerrohr 13 konzentrisch umgebender Torus-Pulverkanal 17 eingeschnitten, der sich in Richtung nach vorne in einen Ring-Pulverkanal 18 fortsetzt, der unter diffusorartiger Erweiterung an der Vorderstirn des Fortsatzes 10b nach außen mündet. In den Torus-Pulverkanal 17 mündet tangential und mit Schräganstellung in Richtung nach vorne ein Einlaßstuzen 19, an den ein nichtgezeichneter Zuführschlauch für das Pulver-Luft-Gemisch anschließbar ist.The barrel extension 10b has essentially the shape of a cylinder, the rear part of which is designed as a tubular piece spanning the barrel main part 10a; this piece of pipe has an internal thread, with the aid of which the barrel extension 10b can be screwed onto the external thread of the barrel main part 10a. Furthermore, the barrel extension 10b has a central inner bore, through which the electrode support tube 13 is passed axially to the front. In the middle region of the barrel extension 10b, a torus powder channel 17 is cut into the concentrically surrounding the electrode support tube 13, which continues in the forward direction into a ring powder channel 18, which diffuses like a widening on the front forehead of the extension 10b opens outwards. An inlet nozzle 19, into which a feed tube (not shown) for the powder-air mixture can be connected, opens into the torus powder duct 17 tangentially and with a sloping position in the forward direction.

Vor der Mündung des Elektroden-Trägerrohrs 13 befindet sich ein Prallkörper 20 mit nach vorne abstehender Nadelelektrode 21, wobei der Prallkörper 20 mittels Querstiften im Elektroden-Trägerrohr 13 gehaltert ist. Im Prallkörper 20 verlaufen zur Elektrode 21 parallele Luftkanäle 22, die mit dem Innenraum des Elektroden-Trägerrohrs 13 in Verbindung stehen. Die Elektrode 21 selbst ist über ein Hochspannungskabel 23, das durch den Innenraum des Elektroden-Trägerrohrs 13 hindurch geführt ist, mit dem Hochspannungsausgang des Hochspannungserzeugers 14 verbunden. Mit 24 schließlich ist ein auf den vorderen Bereich des Lauf-Fortsatzes 10b aufgesteckter Mündungsring bezeichnet.In front of the mouth of the electrode support tube 13 there is an impact body 20 with the needle electrode 21 projecting forward, the impact body 20 being held in the electrode support tube 13 by means of transverse pins. Air ducts 22 parallel to the electrode 21 run in the impact body 20 and are connected to the interior of the electrode support tube 13. The electrode 21 itself is connected to the high-voltage output of the high-voltage generator 14 via a high-voltage cable 23, which is guided through the interior of the electrode support tube 13. Finally, 24 denotes a muzzle ring which is plugged onto the front region of the barrel extension 10b.

Die Pulver-Beschichtungspistole arbeitet folgendermaßen. Über den nicht-gezeichneten Zuführungsschlauch wird ein Pulver-Luft-Gemisch in Richtung des Pfeils B durch den Anschlußstutzen 19 hindurch spiralig-tangential in den Torus-Pulverkanal 17 eingeleitet, von welchem das Gemisch in den Ringkanal 18 gelangt und durch diesen hindurch nach außen strömt. Durch die diffusorartige Erweiterung des Ringkanals 18 und die Wirkung des Prallkörpers 20 wird eine sehr frühzeitig aufgehende Pulverwolke erzeugt, was sowohl die Aufladung als auch den Transport des Pulvers begünstigt. Die Aufladung des Pulvers erfolgt dabei durch die Elektrode 21, die ja, wie erwähnt, an Hochspannung liegt. Vom nicht-gezeichneten hinteren Bereich der Beschichtungspistole her wird Druckluft als Spülluft zugeführt, und zwar in Richtung der Pfeile A. Diese Spülluft durchsetzt den Ringspalt 15 und gelangt über den Stirnspalt 16 und den Innenraum des Elektroden-Trägerrohrs 13 in die Kanäle 22, die es als feine, die Elektrode 21 umgebende Luftstrahlen verläßt. Diese Spülluft sorgt im Bereich der Spalte 15, 16 für das Abführen statischer Aufladungen und im Bereich der Elektrode 21 für deren Reinhaltung.The powder coating gun works as follows. About the supply hose, not shown, a powder-air mixture is introduced in the direction of arrow B through the connecting piece 19 spirally tangentially into the torus powder channel 17, from which the mixture reaches the annular channel 18 and flows through it to the outside . Due to the diffuser-like expansion of the ring channel 18 and the action of the impact body 20, a powder cloud that rises very early is generated, which favors both the charging and the transport of the powder. The powder is charged by the electrode 21, which, as mentioned, is connected to high voltage. Compressed air is supplied as purging air from the rear region of the coating gun, not shown, in the direction of arrows A. This purging air passes through the annular gap 15 and passes through the end gap 16 and the interior of the electrode carrier tube 13 into the channels 22, which are there as fine air jets surrounding the electrode 21. This purging air ensures that static charges are dissipated in the area of the gaps 15, 16 and that they are kept clean in the area of the electrode 21.

Fig. 3 zeigt eine Abwandlungsform für die Erzielung eines Pulver-Flachstrahls. Dabei ist gegenüber der Ausführungsform von Fig. 1 der dort verwendete Mündungsring 24 durch eine Kappe 30 mit Schlitzdüse 31 ersetzt, durch welche die Elektrodennadel 21 hindurchragt. Selbstverständlich ist bei dieser Ausführungsform auch der Prallkörper 20 weggelassen. Gerade bei dieser Ausführungsform ist die aus dem Innenraum des Elektroden-Trägerrohrs 13 austretende und die Elektrodennadel 21 umspülende Druckluft von großer Bedeutung, weil diese hier nicht nur eine Verschmutzung der Elektrodennadel, sondern vor allem ein Zusetzen des Düsenschlitzes 31 verhindert.Fig. 3 shows a modification for the achievement of a powder flat jet. Compared to the embodiment of FIG. 1, the orifice ring 24 used there is replaced by a cap 30 with a slot nozzle 31 through which the electrode needle 21 projects. Of course, the impact body 20 is also omitted in this embodiment. In this embodiment in particular, the compressed air emerging from the interior of the electrode support tube 13 and washing around the electrode needle 21 is of great importance, because here it not only prevents contamination of the electrode needle, but above all prevents the nozzle slot 31 from becoming clogged.

Die dargestellten Ausführungsformen können zahlreiche Abwandlungen erfahren. So ist es selbstverständlich nicht zwingend erforderlich, daß der Pistolenlauf 10 aus zwei voneinander lösbaren Teilen, nämlich dem Hauptteil 10a und dem Fortsatz 10b, besteht; gegenüber einem einstückigen Pistolenlauf ergibt sich jedoch durch die dargestellte Unterteilung der Vorteile der erleichterten Herstellung und vor allem der erleichterten Zerlegung und Reinigung der Pistole. Auch kann der Ringkanal 18 über seine gesamte Länge konstanten Durchmesser aufweisen, sich sogar zur Mündung hin verengen. Schließlich sei noch bemerkt, daß der Hochspannungserzeuger 14 auch lediglich die Endstufe (Kaskade) der Erzeugerschaltung sein kann.The illustrated embodiments can undergo numerous modifications. So it is of course not absolutely necessary that the gun barrel 10 consists of two detachable parts, namely the main part 10a and the extension 10b; Compared to a one-piece gun barrel, however, the subdivision shown gives the advantages of easier manufacture and, above all, easier disassembly and cleaning of the gun. The annular channel 18 can also have a constant diameter over its entire length, even narrow towards the mouth. Finally, it should be noted that the high-voltage generator 14 can also only be the final stage (cascade) of the generator circuit.

Claims (7)

  1. Electrostatic powder-coating gun, having a powder duct connected to a supply line for a powder-air mixture and open along the longitudinal axis of the gun barrel in the direction of the workpiece to be coated, a high voltage generator connected to an electric feed line, an electrode carrier tube axially passing through the powder duct, and a high voltage electrode located on, on top of or in the carrier tube, protruding in the direction of the workpiece via the powder duct opening, and connected to the high voltage generator by means of a conductor extending in the carrier tube, wherein the high voltage generator (14) and the powder duct (17, 18) are arranged along the longitudinal axis of the gun barrel (10) one behind the other, characterised in that the powder duct (17, 18) is adjacent to the opening of the gun barrel (10) and consists of a toroidal powder duct (17) coaxial with the electrode carrier tube (13), and an annular duct (18) proceeding from this, also coaxial with the electrode carrier tube (13) and open in the direction of the workpiece, the supply line (21) for the powder-air mixture being in an inclined position with respect to the workpiece and opening tangentially into the toroidal powder duct (17).
  2. Electrostatic powder-coating gun according to claim 1, characterised in that an annular gap (15) is left open between the high voltage generator (14) and the inner wall of the gun barrel (10), which on the one hand is in connection with a compressed air supply line and on the other hand with the inner chamber of the electrode carrier tube (13) opening out adjacently to the high voltage electrode (21).
  3. Electrostatic powder-coating gun according to claim 1 or 2, characterised in that the annular powder duct widens conically from the toroidal powder duct (17) to its opening.
  4. Electrostatic powder-coating gun according to one of claims 1 to 3, characterised in that the high voltage electrode (21) is located on an impact body (20) connected to the electrode carrier tube (13).
  5. Electrostatic powder-coating gun according to claim 2 and 4, characterised in that the impact body (20) has air vents (22).
  6. Electrostatic powder-coating gun according to one of claims 1 to 3, characterised in that a cap (30) with a slotted nozzle (31) is placed onto the gun barrel opening, the high voltage electrode (21) protruding through the slotted nozzle (31).
  7. Electrostatic powder-coating gun according to one of claims 1 to 6, characterised in that the gun barrel (10) is made of a barrel main portion (10a) and a barrel extension (10b) connected to this.
EP92119738A 1991-12-17 1992-11-19 Electrostatic powder coating gun Expired - Lifetime EP0547397B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4141663A DE4141663C2 (en) 1991-12-17 1991-12-17 Electrostatic powder coating gun
DE4141663 1991-12-17

Publications (2)

Publication Number Publication Date
EP0547397A1 EP0547397A1 (en) 1993-06-23
EP0547397B1 true EP0547397B1 (en) 1995-06-21

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EP92119738A Expired - Lifetime EP0547397B1 (en) 1991-12-17 1992-11-19 Electrostatic powder coating gun

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US (1) US5482214A (en)
EP (1) EP0547397B1 (en)
JP (1) JPH05245416A (en)
CZ (1) CZ281696B6 (en)
DE (2) DE4141663C2 (en)
DK (1) DK0547397T3 (en)
ES (1) ES2073845T3 (en)
HU (2) HU215134B (en)
PL (1) PL170193B1 (en)

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DE19709786A1 (en) * 1997-03-10 1998-02-12 Gema Volstatic Ag Electrostatic powder sprayer for applying conductive coatings to objects
US6377768B1 (en) 1997-06-12 2002-04-23 OCé PRINTING SYSTEMS GMBH Device and method for inking a charge pattern using a toner spraying device
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US6874712B2 (en) * 2002-09-27 2005-04-05 Abb Inc. Swirl gun for powder particles
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Also Published As

Publication number Publication date
EP0547397A1 (en) 1993-06-23
ES2073845T3 (en) 1995-08-16
PL297008A1 (en) 1993-09-20
DE4141663A1 (en) 1993-06-24
DE59202614D1 (en) 1995-07-27
CZ281696B6 (en) 1996-12-11
HU215134B (en) 1998-09-28
HUT64490A (en) 1994-01-28
PL170193B1 (en) 1996-11-29
JPH05245416A (en) 1993-09-24
HU9203924D0 (en) 1993-03-29
DK0547397T3 (en) 1995-08-21
CZ369892A3 (en) 1993-07-14
DE4141663C2 (en) 1996-09-19
US5482214A (en) 1996-01-09

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