EP0163118A2 - Pistolet de pulvérisation pour le revêtement à poudre - Google Patents

Pistolet de pulvérisation pour le revêtement à poudre Download PDF

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Publication number
EP0163118A2
EP0163118A2 EP85104954A EP85104954A EP0163118A2 EP 0163118 A2 EP0163118 A2 EP 0163118A2 EP 85104954 A EP85104954 A EP 85104954A EP 85104954 A EP85104954 A EP 85104954A EP 0163118 A2 EP0163118 A2 EP 0163118A2
Authority
EP
European Patent Office
Prior art keywords
powder
guide body
feed channel
section
cross
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
EP85104954A
Other languages
German (de)
English (en)
Other versions
EP0163118B1 (fr
EP0163118A3 (en
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.)
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
Publication of EP0163118A2 publication Critical patent/EP0163118A2/fr
Publication of EP0163118A3 publication Critical patent/EP0163118A3/de
Application granted granted Critical
Publication of EP0163118B1 publication Critical patent/EP0163118B1/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
    • B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging

Definitions

  • the invention relates to a spray device for coating objects with powder, with a feed channel for the powder pneumatically conveyed by a carrier gas stream, with a discharge opening at the end of the feed channel, with a channel wall forming the feed channel, which extends on a longitudinal section through a pipe section and downstream thereof an insulating material jacket electrically charging the powder by friction, which extends to or close to the discharge opening, and with an injector arranged coaxially to the feed channel for introducing an accelerating gas coaxially surrounding the carrier gas powder stream and accelerating it by suction at an angle between 15 ° and 90 0 to the feed channel axis via an injector outlet at the downstream end of the pipe section.
  • Such a device is known from US Pat. No. 4,090,666.
  • the tube section forms a double annular gap nozzle through which the carrier gas powder stream is fed through the inner channel and the accelerating gas stream is fed through the outer annular gap.
  • a P ulversprühvorraum with electrokinetic charging of the powder also shows the DE-PS 23 47 491.
  • DE-OS 18 14 809 shows a spray device, wherein in the powder stream additional air added, and then the powder additional air current is converted by the guide vanes in a vortex flow .
  • the object of the invention is to achieve a stronger electrical charging of the powder particles over a shorter distance of the feed channel.
  • the powder passage cross section of the feed channel changes from a filled cross-sectional shape to a cross-sectional annular cross-sectional shape with a smaller flow passage cross-sectional area through an elongated guide body axially arranged in its center between the injector and the discharge opening, that the guide body also consists of a the powder consists of electrically charging material due to friction, and that the guide body extends from near the injector at least as far as close to the discharge opening, that the powder becomes more electrically charged due to friction on the guide body and the powder essentially extends from the downstream end of the guide body to the discharge opening no electrical charge loses.
  • FIG. 1 shows an axial longitudinal section of a spray device according to the invention.
  • the spraying device shown in the drawing for coating objects with powder contains a feed channel 2 for the powder pneumatically conveyed by a carrier gas stream, a discharge opening 4 at the end of the feed channel 2, a channel wall 6 forming the feed channel 2, which extends through a pipe section 8 on a longitudinal section and downstream therefrom consists of an insulating material jacket 10 that electrically charges the powder by friction and extends to the discharge opening 4.
  • An injector 12 is arranged coaxially to the feed channel 2 for introducing an accelerating gas which coaxially surrounds the carrier gas powder stream and accelerates it by suction.
  • the injector outlet 14 is an annular gap nozzle which is formed at the downstream end of the pipe section 8 between this pipe section 8 and the insulating material jacket 10.
  • the pipe section 8 separates the feed channel 2 from an annular chamber 16 surrounding it.
  • the outer circumference at the downstream end 18 of the pipe 8 is tapered in the shape of a truncated cone in the direction of flow such that the edge of this downstream pipe end tapers in the form of an annular cutting edge 20.
  • the frustoconically tapered end section 18 of the tube 8 is at a short distance from a truncated cone-shaped initial section 22 of the insulating material jacket 10 opposite.
  • the two parts 18 and 22 form between them the annular gap of the injector outlet 14 which is designed as an annular gap nozzle and which, in the longitudinal section shown in the drawing, is at an angle between 15 ° and 90 °, preferably at an angle of less than 45 ° to the longitudinal axis of the feed channel 2 extends.
  • the pipe section 8 is connected via an electrical line 24 to an electrical potential, preferably to earth potential.
  • an elongated guide body 26 is arranged axially, which extends essentially over the length of the insulating material jacket 10 from a point close to the downstream end section 18 of the pipe section 8 to the discharge opening 4 and, like the insulating material jacket 10, is made of an electrically insulating material exists, which electrically charges powder particles rubbing along it by friction.
  • the upstream initial section 30 of the guide body 26 is tapered upstream.
  • the cone tip 32 lies between the ring-like cutting edge 20 of the pipe section 8 and the angular apex 34 of the ring slot 14 of the injector outlet.
  • the downstream end 38 of the guide body 26 is axially extended beyond the discharge opening 4 and is provided at its end with a radial annular slot nozzle 40 for generating a gas curtain 42 which radiates out essentially radially in a radial manner.
  • the gas curtain 42 acts as a "pneumatic impact body", on which the gas-powder mixture of the feed channel 2 strikes and is formed into a powder cloud, which then flows further in the flow direction of the feed channel 2 onto an object to be coated.
  • the supply of gas for the Gas curtain 42 takes place via a feed channel 2
  • annular channel 48 then formed between the housing part 46 and the insulating material jacket 10, via bores 50 in webs 52, which hold the guide body 26 in the feed channel 2, to an axial bore 54 of the guide body 26 and from this to the annular slot nozzle 40.
  • a mechanical impact body known per se could also be provided.
  • the acceleration gas is fed into the annular chamber 16 via a further channel 56 of the housing part 44.
  • the electrical line 24 for the pipe section 8 is also passed through this gas channel 56, the latter being made of an electrically conductive or at least semiconducting material.
  • the powder particles are charged positively or negatively by withdrawing anions or cations depends on the type of powder material and the material of the insulating material jacket 10 matched to it, as well as the guide body 26 consisting of insulating material.
  • the charge concentration on the inner lateral surface increases with the opposite electrical charging of the powder particles and reaches a certain saturation after a short time, which impairs further electrical charging of the powder particles.
  • the electrical charging of the insulating material jacket 10 migrates upstream to the cutting edge 20 in the feed channel 2 counter to the flow direction of the powder gas stream and is transferred from the electrically conductive pipe section 8 via its electrical line 24 Derived, the aforementioned saturation of cations or anions between the insulating material jacket 10 and the guide body 26 is avoided, so that the maximum possible friction charging of the subsequent powder particles takes place continuously.
  • the insulating material jacket 10 can consist of several parts.
  • the guide body 26 is also connected to a corresponding electrical potential, preferably to earth potential, via the electrical line 24 or a separate line. According to the drawing, this connection can be made indirectly in that the guide body 26 is connected to the insulating material jacket 10 via pins 62, which hold it in the feed channel 2.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
EP85104954A 1984-05-30 1985-04-24 Pistolet de pulvérisation pour le revêtement à poudre Expired EP0163118B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843420325 DE3420325A1 (de) 1984-05-30 1984-05-30 Spruehvorrichtung zum beschichten von gegenstaenden mit pulver
DE3420325 1984-05-30

Publications (3)

Publication Number Publication Date
EP0163118A2 true EP0163118A2 (fr) 1985-12-04
EP0163118A3 EP0163118A3 (en) 1986-10-08
EP0163118B1 EP0163118B1 (fr) 1989-01-11

Family

ID=6237306

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85104954A Expired EP0163118B1 (fr) 1984-05-30 1985-04-24 Pistolet de pulvérisation pour le revêtement à poudre

Country Status (4)

Country Link
US (1) US4659019A (fr)
EP (1) EP0163118B1 (fr)
DE (1) DE3420325A1 (fr)
ES (1) ES8700972A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002276A1 (fr) * 1985-10-18 1987-04-23 Icab Industrial Coating Ab Pistolet a projection de poudre a declenchement manuel
WO1987004088A1 (fr) * 1986-01-14 1987-07-16 Esb Elektrostatische Sprüh- Und Beschichtungsanlag Dispositif electrostatique de pulverisation a chargement tribo-electrique de la poudre
DE3729713A1 (de) * 1987-09-04 1989-03-23 Gema Ransburg Ag Spruehbeschichtungsvorrichtung fuer pulver zum beschichten von gegenstaenden
EP0592137A1 (fr) * 1992-10-05 1994-04-13 Nordson Corporation Pistolet tribo-électrique de pulvérisation de poudre
FR2820344A1 (fr) 2001-02-08 2002-08-09 Eisenmann France Sarl Pulverisateur triboelectrique

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD232595A3 (de) * 1984-02-08 1986-02-05 Verkehrswesen Hochschule Vorrichtung zum elektrokinetischen aufladen von pulverfoermigen stoffen
DE3514523A1 (de) * 1985-04-22 1986-10-23 Ransburg-Gema AG, St. Gallen Verfahren und vorrichtung zum elektrostatischen beschichten von gegenstaenden mit pulverfoermigem beschichtungsmaterial
DE3611577A1 (de) * 1986-04-07 1987-10-15 Wagner Int Elektrostatische pulver-spruehpistole
SE461319B (sv) * 1987-04-28 1990-02-05 Ac Greiff Ytbehandling Ab Anordning vid pulverspruta innefattande en ringformig friktionsuppladdningskanal
DD271611A3 (de) * 1987-10-27 1989-09-13 Verkehrswesen Hochschule Spruehpistole mit elektrokinetischer pulveraufladung
DE3924425C1 (en) * 1989-07-24 1990-12-20 Gering, Manfred Electrostatic sprayer for powder lacquering - has coaxial circular channels through which particles pass in zigzag formation
US5400976A (en) * 1993-06-02 1995-03-28 Matsuo Sangyo Co., Ltd. Frictional electrification gun
US5622313A (en) * 1995-03-03 1997-04-22 Nordson Corporation Triboelectric powder spray gun with internal discharge electrode and method of powder coating
DE29723226U1 (de) 1997-07-10 1998-06-04 Kolb, Robert, jun., 88046 Friedrichshafen Druckluft-Injektor zur pneumatischen Förderung eines Pulvers
US6461320B1 (en) * 1998-08-12 2002-10-08 Cardica, Inc. Method and system for attaching a graft to a blood vessel
CN105170358A (zh) * 2015-08-12 2015-12-23 浙江绿能塑粉有限公司 一种性能优良的热固性塑粉摩擦枪

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2347491A1 (de) * 1972-10-13 1974-05-02 Oranienburg Infrarot Veb Verfahren und vorrichtung zum elektrostatischen beschichten mit pulverfoermigen stoffen
US4090666A (en) * 1976-05-19 1978-05-23 Coors Container Company Gun for tribo charging powder
DE2938806A1 (de) * 1978-09-26 1980-04-03 Toyota Motor Co Ltd Triboelektrische pulverspruehpistole
DE3013891A1 (de) * 1979-10-03 1981-04-09 Toyota Jidosha Kogyo K.K., Toyota, Aichi Elektrostatisches pulverspritzverfahren zur erzeugung eines farbauftrags
FR2559076A1 (fr) * 1984-02-08 1985-08-09 Oranienburg Infrarot Veb Dispositif pour appliquer, par voie electrocinetique, une charge a des substances pulverulentes

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1814809A1 (de) * 1968-12-14 1970-07-30 Mueller Ernst Fa Verfahren und Vorrichtung zum Bestaeuben von Gegenstaenden mit Pulver
GB1241593A (en) * 1968-05-16 1971-08-04 Aerostyle Ltd Improvements in or relating to electrostatic powder spraying apparatus
SE371942B (fr) * 1972-03-13 1974-12-09 Atlas Copco Ab
DE2509851C2 (de) * 1975-03-06 1984-03-15 Ransburg-Gema AG, 9015 St.Gallen Pulverzerstäuber mit Prallkörper zum Beschichten von Gegenständen im elektrostatischen Feld
DD134841B1 (de) * 1978-03-22 1981-05-27 Peter Dressler Vorrichtung zum elektrokinetischen Beschichten mit pulver- und faserförmigen Teilchen
JPS5534159A (en) * 1978-09-01 1980-03-10 Onoda Cement Co Ltd Powder charging device and electrostatic powder depositing device
US4225090A (en) * 1979-09-07 1980-09-30 Toyota Jidosha Kogyo Kabushiki Kaisha Device for painting by electrostatic powder spraying
JPS6134065Y2 (fr) * 1980-08-29 1986-10-04

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2347491A1 (de) * 1972-10-13 1974-05-02 Oranienburg Infrarot Veb Verfahren und vorrichtung zum elektrostatischen beschichten mit pulverfoermigen stoffen
US4090666A (en) * 1976-05-19 1978-05-23 Coors Container Company Gun for tribo charging powder
DE2938806A1 (de) * 1978-09-26 1980-04-03 Toyota Motor Co Ltd Triboelektrische pulverspruehpistole
DE3013891A1 (de) * 1979-10-03 1981-04-09 Toyota Jidosha Kogyo K.K., Toyota, Aichi Elektrostatisches pulverspritzverfahren zur erzeugung eines farbauftrags
FR2559076A1 (fr) * 1984-02-08 1985-08-09 Oranienburg Infrarot Veb Dispositif pour appliquer, par voie electrocinetique, une charge a des substances pulverulentes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002276A1 (fr) * 1985-10-18 1987-04-23 Icab Industrial Coating Ab Pistolet a projection de poudre a declenchement manuel
US4886215A (en) * 1985-10-18 1989-12-12 Nordson Corporation Hand operated powder spray pistol
WO1987004088A1 (fr) * 1986-01-14 1987-07-16 Esb Elektrostatische Sprüh- Und Beschichtungsanlag Dispositif electrostatique de pulverisation a chargement tribo-electrique de la poudre
DE3729713A1 (de) * 1987-09-04 1989-03-23 Gema Ransburg Ag Spruehbeschichtungsvorrichtung fuer pulver zum beschichten von gegenstaenden
EP0592137A1 (fr) * 1992-10-05 1994-04-13 Nordson Corporation Pistolet tribo-électrique de pulvérisation de poudre
FR2820344A1 (fr) 2001-02-08 2002-08-09 Eisenmann France Sarl Pulverisateur triboelectrique
US6959884B2 (en) 2001-02-08 2005-11-01 Eisenmann France Sarl Triboelectric sprayer

Also Published As

Publication number Publication date
ES543590A0 (es) 1986-11-16
DE3420325C2 (fr) 1987-09-24
EP0163118B1 (fr) 1989-01-11
DE3420325A1 (de) 1985-12-05
EP0163118A3 (en) 1986-10-08
US4659019A (en) 1987-04-21
ES8700972A1 (es) 1986-11-16

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