EP0547397B1 - Elektrostatische Pulver-Beschichtungspistole - Google Patents

Elektrostatische Pulver-Beschichtungspistole 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
Authority
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
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0547397A1 (de
Inventor
Radovan Talacko
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.)
Wagner International AG
Original Assignee
Wagner International AG
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 Wagner International AG filed Critical Wagner International AG
Publication of EP0547397A1 publication Critical patent/EP0547397A1/de
Application granted granted Critical
Publication of EP0547397B1 publication Critical patent/EP0547397B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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)
EP92119738A 1991-12-17 1992-11-19 Elektrostatische Pulver-Beschichtungspistole Expired - Lifetime EP0547397B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4141663A DE4141663C2 (de) 1991-12-17 1991-12-17 Elektrostatische Pulver-Beschichtungspistole
DE4141663 1991-12-17

Publications (2)

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

Family

ID=6447283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92119738A Expired - Lifetime EP0547397B1 (de) 1991-12-17 1992-11-19 Elektrostatische Pulver-Beschichtungspistole

Country Status (9)

Country Link
US (1) US5482214A (pl)
EP (1) EP0547397B1 (pl)
JP (1) JPH05245416A (pl)
CZ (1) CZ281696B6 (pl)
DE (2) DE4141663C2 (pl)
DK (1) DK0547397T3 (pl)
ES (1) ES2073845T3 (pl)
HU (2) HU9203924D0 (pl)
PL (1) PL170193B1 (pl)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960007018A (ko) * 1994-08-17 1996-03-22 이마무라 가즈스께 정전 파우더 도장 방법과 장치
DE19709786A1 (de) * 1997-03-10 1998-02-12 Gema Volstatic Ag Elektrostatische Pulversprühvorrichtung
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
AU1066799A (en) * 1997-10-06 1999-04-27 Hosokawa Micron International Inc. Method and apparatus for vapor phase manufacture of nanoparticles
US6874712B2 (en) * 2002-09-27 2005-04-05 Abb Inc. Swirl gun for powder particles
US20050098659A1 (en) * 2002-09-27 2005-05-12 Milojevic Dragoslav K. Swirl gun for powder particles
USD545943S1 (en) 2006-03-14 2007-07-03 Illinois Tool Works Inc. Coating material dispensing device
KR100959507B1 (ko) * 2009-12-23 2010-05-27 한국희 분체도장장치 및 이를 이용한 도장방법
CN107262320B (zh) * 2017-06-26 2023-08-29 中信戴卡股份有限公司 一种混线式轮毂螺栓孔自动清粉系统及组合式清粉枪
WO2023232199A2 (de) 2022-06-03 2023-12-07 P+S Pulverbeschichtungs- Und Staubfilteranlagen Gmbh Verfahren zum ausbringen von pulver und pulversprühdüse zur durchführung des verfahrens

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5056720A (en) * 1990-09-19 1991-10-15 Nordson Corporation Electrostatic spray gun

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1005450A (fr) * 1947-07-22 1952-04-10 Procédé et dispositif pour la pulvérisation de tous liquides et le fibrage de matières thermoplastiques
CH496481A (de) * 1969-06-25 1970-09-30 Gema Ag App Bau Vorrichtung zum elektrostatischen Beschichten von Gegenständen mit zerstäubten Feststoffpartikeln
US3901184A (en) * 1974-07-23 1975-08-26 Continental Can Co Pneumatic powder flow diverting device
JPS5243846A (en) * 1975-10-03 1977-04-06 Senichi Masuda Device for electrostatic powder coating
US4380320A (en) * 1981-02-25 1983-04-19 Nordson Corporation Electrostatic powder spray gun nozzle
ES517085A0 (es) * 1982-11-03 1983-10-16 Fusco Lupo Jose De Perfeccionamientos introducidos en pistolas electrostaticas.
US4462061A (en) * 1983-06-29 1984-07-24 Graco Inc. Air turbine drive for electrostatic spray gun
US4634058A (en) * 1984-12-13 1987-01-06 Nordson Corporation Powder spray gun
DE3514523A1 (de) * 1985-04-22 1986-10-23 Ransburg-Gema AG, St. Gallen Verfahren und vorrichtung zum elektrostatischen beschichten von gegenstaenden mit pulverfoermigem beschichtungsmaterial
DE3529703C1 (de) * 1985-08-20 1986-08-28 Ransburg-Gema AG, St. Gallen Spruehvorrichtung zur elektrostatischen Pulverbeschichtung
US4819879A (en) * 1985-10-25 1989-04-11 Nordson Corporation Particle spray gun
DE3545885C1 (de) * 1985-12-23 1993-03-04 Kopperschmidt Mueller & Co Elektrostatische Spruehpistole
DE3546231A1 (de) * 1985-12-27 1987-07-02 Gerhard Hestermann Pulver-spruehpistole
EP0236794B1 (de) * 1986-03-13 1991-01-02 ITW Gema AG Elektrostatische Sprüheinrichtung für Beschichtungspulver
DE3608415A1 (de) * 1986-03-13 1987-09-24 Gema Ransburg Ag Elektrostatische sprueheinrichtung fuer beschichtungspulver
DE3644840A1 (de) * 1986-04-04 1987-10-15 Wagner Int Elektrostatische pulver-spruehpistole
DE3611577A1 (de) * 1986-04-07 1987-10-15 Wagner Int Elektrostatische pulver-spruehpistole
US4772982A (en) * 1986-11-13 1988-09-20 Hideo Nagasaka Powder charging apparatus and electrostatic powder coating apparatus
US4784331A (en) * 1987-05-27 1988-11-15 Nordson Corporation Electrostatic spray gun device and cable assembly
US4830279A (en) * 1987-09-21 1989-05-16 Nordson Corporation Flat spray nozzle for a spray gun
DD271611A3 (de) * 1987-10-27 1989-09-13 Verkehrswesen Hochschule Spruehpistole mit elektrokinetischer pulveraufladung
DE4005350A1 (de) * 1990-02-20 1991-08-22 Wagner Int Duesenvorsatz fuer pulverspruehpistolen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5056720A (en) * 1990-09-19 1991-10-15 Nordson Corporation Electrostatic spray gun

Also Published As

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

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