EP1673175A1 - Powder spraying pistol - Google Patents

Powder spraying pistol

Info

Publication number
EP1673175A1
EP1673175A1 EP03747793A EP03747793A EP1673175A1 EP 1673175 A1 EP1673175 A1 EP 1673175A1 EP 03747793 A EP03747793 A EP 03747793A EP 03747793 A EP03747793 A EP 03747793A EP 1673175 A1 EP1673175 A1 EP 1673175A1
Authority
EP
European Patent Office
Prior art keywords
powder
air
gun
channel
flow
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.)
Withdrawn
Application number
EP03747793A
Other languages
German (de)
French (fr)
Inventor
Gianluca Stalder
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1673175A1 publication Critical patent/EP1673175A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B05B1/262—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
    • B05B1/265—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being symmetrically deflected about the axis of the nozzle

Definitions

  • Powder spray gun The present invention relates to a gun for electrostatic powder spraying, with a conveying channel for supplying powder from a reservoir for gun outlet by means of a main air flow, the powder-air mixture ionized by means of high voltage being formed into a powder cloud at the gun outlet.
  • Such powder spray guns are known in a wide variety of embodiments.
  • air particles molecules
  • the part to be coated is set to a counter potential, so that the powder particles adhere to the named part.
  • Such conventional powder spray guns generally have a power connection (for generating the high voltage), a powder feed and an air feed and, of course, a gun outlet for the powder cloud generated.
  • the powder is conveyed via an injector, where the powder is conveyed in a hose or channel at a speed of approx. 18 m / s, which means that the powder has a sufficient speed at the gun outlet.
  • the air flow used for powder delivery and the air supply are also used to clean the impact body or the slit gland.
  • the object of the present invention is to provide a powder spray gun which achieves improved powder atomization and in which an improved powder cloud can be created.
  • This object is achieved according to the invention in a powder spray gun of the type defined at the outset by the features of the characterizing part of claim 1.
  • Particular embodiments of the invention are defined in the dependent claims.
  • the essence of the invention thus lies in the supply of additional air which is used for improved powder atomization, regulation of the powder cone size, acceleration of the powder to the required (optimized) speed and, as a side effect, for automatic cleaning of the nozzle.
  • the high voltage necessary for the ionization can be generated inside or outside the impact body.
  • the powder spray gun designed according to the invention can be used as a hand-held device or automatic device.
  • FIG. 1 shows a purely schematic section through the head of a powder spray gun according to the invention with an impact body;
  • Fig. 2 shows the front head part of Fig. 1, somewhat enlarged, and
  • Fig. 3 shows a variant of the gun of Fig. 1 with slot nozzle.
  • the powder spray gun designed according to the invention the powder is sucked in under vacuum and transported further as a powder-air mixture. This results in a much higher density, ie more powder in relation to the air. Thanks to this increase in the powder quantity to the (transport) air quantity, the transport speed of the powder can be reduced (the conveying speed is approx. 6 m / s).
  • the powder at the gun outlet must be accelerated.
  • This additionally introduced air not only serves to accelerate the powder, but above all to improve the mixing and atomization of the powder, i.e. a much more homogeneous powder cloud can be generated.
  • the additional air flow (s) can be individually regulated depending on the requirement (type of powder, application) (separate air sources, i.e. pumps). Thanks to the additional air (via one or more additional air channels), the effect of the ionizing high voltage is also better distributed.
  • FIG. 1 of the drawing shows the head of a powder spray gun 1 designed according to the invention.
  • a powder-air mixture passes through the main air duct 2
  • Round jet nozzle 3 the mixture exiting at 4 and being formed into a powder cone 6 by the impact body 5.
  • additional channels 7, 7 ' can separately supply air at an increased speed in order to accelerate the powder-air flow in the round duct 2 'for the first time.
  • the most important additional air duct 8 is located inside the nozzle 3 on the gun axis (air enters the duct 8 via a side feed 8 ′).
  • the known electrode 9 for ionizing the mixture can end immediately before the end of the impact body 5 or, leading through an end seal 5 ', outside.
  • speed emerges through two different round gaps 9 'and hits the powder cloud 6 in order to accelerate it and mix the powder again (before it hits the object to be coated).
  • a further outlet of additional air can take place at 10.
  • FIG. 3 shows a variant of a pistol according to the invention with a slot nozzle (exit slot 11 to the front). Accelerating air and air are mixed in here for mixing / atomization at points 7, 12 to 14.
  • the supply of additional air can be regulated independently of the main air flow.

Abstract

An electrostatic powder spraying pistol (1) comprises, next to the main conveying channel (2,2'), at least one additional supply channel (7,7'; 8,9') for additional air, which acts upon the cloud of powder (6) in front of or directly after the pistol exit, i.e. is mixed again and accelerated.

Description

Pulverspritzpistole Die vorliegende Erfindung betrifft eine Pistole zum elektrostatischen Pulverspritzen, mit einem Förderkanal zur Zufuhr von Pulver aus einem Reservoir zum Pistolenaustritt mittels eines Hauptluftstroms, wobei das mittels Hochspannung ionisierte Pulver-Luft-Gemisch am Pistolenaustritt zu einer Pulverwolke geformt wird.Powder spray gun The present invention relates to a gun for electrostatic powder spraying, with a conveying channel for supplying powder from a reservoir for gun outlet by means of a main air flow, the powder-air mixture ionized by means of high voltage being formed into a powder cloud at the gun outlet.
Derartige Pulverspritzpistolen sind in den verschiedensten Ausführungsformen bekannt. Dabei werden im Prinzip mittels Hochspannung im Pulver-Luft-Gemisch Luftteilchen (Moleküle) ionisiert und das zu beschichtende Teil auf ein Gegenpotential gesetzt, sodass die Pulverteilchen am genannten Teil zur Haftung gelangen.Such powder spray guns are known in a wide variety of embodiments. In principle, air particles (molecules) are ionized by means of high voltage in the powder-air mixture and the part to be coated is set to a counter potential, so that the powder particles adhere to the named part.
Solche konventionellen Pulverspritzpistolen weisen in der Regel einen Stromanschluss (für Erzeugung der Hochspannung) eine Pulverzuführung und eine Luftzuführung auf und, selbstverständlich, einen Pistolenaustritt für die erzeugte Pulverwolke. Die Pulverförderung erfolgt über einen Injektor, wo das Pulver in einem Schlauch oder Kanal mit einer Geschwindigkeit von ca. 18 m/s gefördert wird, was bedeutet, dass das Pulver beim Pistolenaustritt eine ausreichende Geschwindigkeit aufweist. Der zur Pulverförderung eingesetzte Luftstrom und die Luftzuführung werden auch zur Reinigung des Prallkörpers oder der Schlitzdrüse verwendet.Such conventional powder spray guns generally have a power connection (for generating the high voltage), a powder feed and an air feed and, of course, a gun outlet for the powder cloud generated. The powder is conveyed via an injector, where the powder is conveyed in a hose or channel at a speed of approx. 18 m / s, which means that the powder has a sufficient speed at the gun outlet. The air flow used for powder delivery and the air supply are also used to clean the impact body or the slit gland.
Aufgabe der vorliegenden Erfindung ist es, eine Pulverspritzpistole zu schaffen, welche eine verbesserte Pulverzerstäubung erzielt und bei welcher eine verbesserte Pulverwolke geschaffen werden kann. Diese Aufgabe wird bei einer Pulverspritzpistole der eingangs definierten Art erfindungsgemäss durch die Merkmale des kennzeichnenden Teils von Anspruch 1 gelöst. Besondere Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen definiert. Der Kern der Erfindung liegt somit in der Zufuhr von , Zusatzluft, welche zur verbesserten Pulverzerstäubung, einer Regelung der Pulverkegelgrösse, der Beschleunigung des Pulvers auf die benötigte (optimierte) Geschwindigkeit und, als Nebeneffekt, zur automatischen Reinigung der Düse benutzt wird. Die für die Ionisierung notwendige Hochspannung kann innerhalb oder ausserhalb des Prallkörpers erzeugt werden. Selbstverständlich kann die erfindungsgemäss ausgebildete Pulverspritzpistole als Handgerät oder Automatikgerät angewendet werden. Die Erfindung wird nachstehend anhand einiger in der Zeichnung dargestellter Ausführungsbeispiele noch etwas näher erläutert. Es zeigen: Fig. 1 einen rein schematischen Schnitt durch den Kopf einer erfindungsgemässen Pulverspritzpistole mit Prallkörper; Fig. 2 den vorderen Kopfteil nach Fig. 1, etwas vergrössert, und Fig. 3 eine Variante der Pistole nach Fig. 1 mit Schlitzdüse. Im Vergleich zu den bekannten Pistolen wird bei der erfindungsgemäss ausgebildeten .Pulverspritzpistole das Pulver im Unterdrück angesaugt und als Pulver-Luft-Gemisch weiter transportiert. Dabei wird eine viel höhere Dichte, d.h. mehr Pulver im Verhältnis zur Luft erreicht. Dank dieser Erhöhung der Pulvermenge zur (Transport-) Luftmenge, kann die Transportgeschwindigkeit des Pulvers reduziert werden (die Fördergeschwindigkeit beträgt ca. 6 m/s) .The object of the present invention is to provide a powder spray gun which achieves improved powder atomization and in which an improved powder cloud can be created. This object is achieved according to the invention in a powder spray gun of the type defined at the outset by the features of the characterizing part of claim 1. Particular embodiments of the invention are defined in the dependent claims. The essence of the invention thus lies in the supply of additional air which is used for improved powder atomization, regulation of the powder cone size, acceleration of the powder to the required (optimized) speed and, as a side effect, for automatic cleaning of the nozzle. The high voltage necessary for the ionization can be generated inside or outside the impact body. Of course, the powder spray gun designed according to the invention can be used as a hand-held device or automatic device. The invention is explained in more detail below with reference to some exemplary embodiments shown in the drawing. 1 shows a purely schematic section through the head of a powder spray gun according to the invention with an impact body; Fig. 2 shows the front head part of Fig. 1, somewhat enlarged, and Fig. 3 shows a variant of the gun of Fig. 1 with slot nozzle. In comparison to the known pistols, in the powder spray gun designed according to the invention, the powder is sucked in under vacuum and transported further as a powder-air mixture. This results in a much higher density, ie more powder in relation to the air. Thanks to this increase in the powder quantity to the (transport) air quantity, the transport speed of the powder can be reduced (the conveying speed is approx. 6 m / s).
Bei dieser neuartigen Technik muss aber das Pulver am Pistolenaustritt beschleunigt werden. Dies wird erfindungsgemäss dadurch erreicht, dass zusätzliche Luft in den Pulver-Luft-Strom eingeblasen wird. Diese zusätzlich eingebrachte Luft dient nicht nur der Beschleunigung der Pulvers, sondern vor allem einer verbesserten Durchmischung und Zerstäubung des Pulvers, d.h. es kann eine wesentlich homogenere Pulverwolke erzeugt werden. Der bzw. die Zusatzluftströme können je nach Erfordernis (Art des Pulvers, Anwendung) individuell geregelt werden (separate Luftquellen, d.h. Pumpen). Dank der Zusatzluft (über einen oder mehrere zusätzliche Luftkanäle) wird auch die Wirkung der ionisierenden Hochspannung besser verteilt.With this new technology, however, the powder at the gun outlet must be accelerated. This is achieved according to the invention in that additional air is blown into the powder-air stream. This additionally introduced air not only serves to accelerate the powder, but above all to improve the mixing and atomization of the powder, i.e. a much more homogeneous powder cloud can be generated. The additional air flow (s) can be individually regulated depending on the requirement (type of powder, application) (separate air sources, i.e. pumps). Thanks to the additional air (via one or more additional air channels), the effect of the ionizing high voltage is also better distributed.
Fig. 1 der Zeichnung zeigt den Kopf einer erfindungsgemäss ausgebildeten Pulverspritzpistole 1. Durch den Hauptluftkanal 2 gelangt ein Pulver-Luft-Gemisch zur1 of the drawing shows the head of a powder spray gun 1 designed according to the invention. A powder-air mixture passes through the main air duct 2
Rundstrahldüse 3, wobei das Gemisch bei 4 austritt und vom Prallkörper 5 zu einem Pulverkegel 6 geformt wird. Bereits unmittelbar vor der Düse 3 kann durch zusätzliche Kanäle 7,7' separat Luft mit erhöhter Geschwindigkeit zugeführt werden, um den Pulver-Luft-Strom im Rundkanal 2' ein erstes Mal zu beschleunigen.Round jet nozzle 3, the mixture exiting at 4 and being formed into a powder cone 6 by the impact body 5. Directly in front of the nozzle 3, additional channels 7, 7 'can separately supply air at an increased speed in order to accelerate the powder-air flow in the round duct 2 'for the first time.
Der wichtigste Zusatzluftkanal 8 befindet sich im Innern der Düse 3 auf der Pistolenachse (Luft gelangt über seitliche Zufuhr 8' in den Kanal 8) .The most important additional air duct 8 is located inside the nozzle 3 on the gun axis (air enters the duct 8 via a side feed 8 ′).
Im Kanal 8 befindet sich auch die an sich bekannte Elektrode 9 zur Ionisierung des Gemisches, sie kann unmittelbar vor dem Ende des Prallkörpers 5 oder, durch einen Endabschluss 5' führend, ausserhalb enden. Der durch den Kanal 8 nach vorn führende Luftstrom mit erhöhterIn the channel 8 there is also the known electrode 9 for ionizing the mixture, it can end immediately before the end of the impact body 5 or, leading through an end seal 5 ', outside. The air flow leading through duct 8 with increased
Geschwindigkeit tritt beim gezeigten Beispiel durch zwei verschiedene Rundspalte 9' aus und trifft auf die Pulverwolke 6, um diese zu beschleunigen und das Pulver nochmals zu durchmischen (bevor dieses auf den zu beschichtenden Gegenstand trifft) .Ein weiterer Austritt von Zusatzluft kann bei 10 erfolgen.In the example shown, speed emerges through two different round gaps 9 'and hits the powder cloud 6 in order to accelerate it and mix the powder again (before it hits the object to be coated). A further outlet of additional air can take place at 10.
Figur 3 zeigt eine Variante einer erfindungsgemässen Pistole mit Schlitzdüse (Austrittschlitz 11 nach vorn) . Hier erfolgt die Zufuhr von beschleunigender Luft und Luft zur Durchmischung/Zerstäubung an den Stellen 7, 12 bis 14.FIG. 3 shows a variant of a pistol according to the invention with a slot nozzle (exit slot 11 to the front). Accelerating air and air are mixed in here for mixing / atomization at points 7, 12 to 14.
Bei den erfindungsgemäss ausgebildeten Pulverspritzpistolen erfolgt die Zufuhr von Zusatzluft zur Verbesserung der Zerstäubung, Beschleunigung des Pulverstromes, Regelung der Pulverkegelgrösse und Reinigung der Pistole an unterschiedlichen Punkten, so z.B. am Beginn (7,7') derIn the case of the powder spray guns designed according to the invention, additional air is supplied to improve the atomization, acceleration of the powder flow, regulation of the powder cone size and cleaning of the gun at different points, e.g. at the beginning (7,7 ') of the
Rundstrahldüse, am Umfang bzw. Ausgang der Düse (10,12) und am Prallkörper (5) .Round jet nozzle, on the circumference or outlet of the nozzle (10, 12) and on the impact body (5).
Die Zufuhr der Zusatzluft ist unabhängig vom Hauptluftstrom regelbar. The supply of additional air can be regulated independently of the main air flow.

Claims

Patentansprüche claims
1. Pistole zum elektrostatischen Pulverspritzen, mit einem Förderkanal zur Zufuhr von Pulver aus einem Reservoir zum Pistolenaustritt mittels eines Hauptluftstroms, wobei das mittels Hochspannung ionisierte Pulver-Luft-Gemisch am Pistolenaustritt zu einer Pulverwolke geformt wird, dadurch gekennzeichnet, dass zusätzlich zum Förderkanal des Pulver- Luft-Gemisches mindestens ein weiterer Luftkanal vorgesehen ist, welcher im Bereich des Pistolenaustritts ausmündet und auf den Pulver-Luft-Gemischstrom trifft, wobei die1. Gun for electrostatic powder spraying, with a feed channel for supplying powder from a reservoir to the gun outlet by means of a main air stream, the powder-air mixture ionized by high voltage being formed into a powder cloud at the gun outlet, characterized in that in addition to the feed channel of the powder - Air mixture at least one further air duct is provided, which opens out in the area of the gun outlet and meets the powder-air mixture flow, the
Geschwindigkeit des zusätzlichen Luftstroms höher ist als die Strömungsgeschwindigkeit des Pulver-Luft-Gemischstroms, um diesen damit zu beschleunigen.The speed of the additional air flow is higher than the flow speed of the powder-air mixture flow in order to accelerate it.
2. Pulverspritzpistole nach Anspruch 1, dadurch gekennzeichnet, dass der bzw. die zusätzlichen Luftkanäle von eigenen Luftquellen gespiesen sind.2. Powder spray gun according to claim 1, characterized in that the additional air channel or channels are fed by their own air sources.
3. Pulverspritzpistole nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass Mittel vorgesehen sind, um die Strömungsgeschwindigkeit der Zusatzluft individuell zu steuern.3. Powder spray gun according to claim 1 or 2, characterized in that means are provided to individually control the flow rate of the additional air.
4. Pulverspritzpistole nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Förderkanal für das Pulver-Luft-Gemisch als Ringkanal zum Pistolenaustritt führt, und dass zumindest ein Zusatzluftkanal im Innern des Ringkanals verläuft.4. Powder spray gun according to one of claims 1 to 3, characterized in that the conveying channel for the powder-air mixture leads as an annular channel to the gun outlet, and that at least one additional air channel runs inside the annular channel.
5. Pulverspritzpistole nach einem der Ansprüche 1 bis 4, mit einem in der Pistolenachse vor dem Pistolenaustritt angeordneten Prallkörper zur Bildung eines sich in Strömungsrichtung öffnenden Pulverkegels, dadurch gekennzeichnet, dass zumindest ein Teil der zusätzlichen Luftkanäle durch den Prallkörper unter einem vorbestimmten Winkel nach aussen führen. 5. Powder spray gun according to one of claims 1 to 4, with a baffle arranged in the gun axis in front of the gun outlet to form a powder cone opening in the flow direction, thereby characterized in that at least some of the additional air ducts lead outwards through the impact body at a predetermined angle.
EP03747793A 2003-10-16 2003-10-16 Powder spraying pistol Withdrawn EP1673175A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2003/000676 WO2005035138A1 (en) 2003-10-16 2003-10-16 Powder spraying pistol

Publications (1)

Publication Number Publication Date
EP1673175A1 true EP1673175A1 (en) 2006-06-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03747793A Withdrawn EP1673175A1 (en) 2003-10-16 2003-10-16 Powder spraying pistol

Country Status (3)

Country Link
EP (1) EP1673175A1 (en)
AU (1) AU2003266909A1 (en)
WO (1) WO2005035138A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8371517B2 (en) * 2007-06-29 2013-02-12 Illinois Tool Works Inc. Powder gun deflector

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3365203B2 (en) * 1996-04-17 2003-01-08 トヨタ自動車株式会社 Rotary atomizing coating equipment
KR100265890B1 (en) * 1996-12-03 2000-09-15 라붸 린도베르 Rotating atomization head type coating apparatus
US5954275A (en) * 1997-04-02 1999-09-21 Toyota Jidosha Kabushiki Kaisha Rotary atomizing electrostatic coating apparatus
US6569258B2 (en) * 2001-05-16 2003-05-27 Fanuc Robotics North America, Inc. Method and apparatus for cleaning a bell atomizer spray head

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005035138A1 *

Also Published As

Publication number Publication date
WO2005035138A1 (en) 2005-04-21
AU2003266909A1 (en) 2005-04-27

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