EP0163118B1 - Sprühvorrichtung zum Beschichten von Gegenständen mit Pulver - Google Patents

Sprühvorrichtung zum Beschichten von Gegenständen mit Pulver Download PDF

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Publication number
EP0163118B1
EP0163118B1 EP85104954A EP85104954A EP0163118B1 EP 0163118 B1 EP0163118 B1 EP 0163118B1 EP 85104954 A EP85104954 A EP 85104954A EP 85104954 A EP85104954 A EP 85104954A EP 0163118 B1 EP0163118 B1 EP 0163118B1
Authority
EP
European Patent Office
Prior art keywords
powder
supply conduit
spray gun
injector
gun according
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
Application number
EP85104954A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0163118A3 (en
EP0163118A2 (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.)
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/de
Publication of EP0163118A3 publication Critical patent/EP0163118A3/de
Application granted granted Critical
Publication of EP0163118B1 publication Critical patent/EP0163118B1/de
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 according to the preamble of claim 1.
  • Such a spray device is known from US-A-4 090 666.
  • the injector outlet is formed by a cylindrical annular gap between a Venturi tube and the cylindrical inner wall of a tubular body made of electrically insulating material.
  • the gas from the injector outlet drives powder particles of a powder gas stream, which flows from an axial channel of the Venturi tube into the tube channel of the tube, against the inner wall of this tube channel, thereby increasing the electrostatic charge of the powder particles by friction on this inner wall.
  • tangential channels open into the axial channel of the venturi tube in order to give the powder gas flow a swirling motion which drives the powder particles radially outward.
  • a guide body thickened at its end, through the thickening of which the flow cross section in the axial channel of the venturi tube is narrowed, so that the speed of the powder gas flow increases therein.
  • a spray device for coating objects with powder which contains a flow channel, on the walls of which powder particles flowing past are electrically charged by friction.
  • a guide body which likewise consists of a material which electrically charges the powder by friction and which extends beyond a downstream discharge opening. Its downstream end is widened so that emerging powder particles impact and are atomized. The atomization is further increased by atomizing air from tangential channels hitting the powder stream emerging from the flow channel.
  • the object of the invention is to achieve a stronger electrical charging of the powder particles over a shorter distance of the powder-gas supply channel.
  • the gas flow of the injector sucks in the carrier gas powder flow in the direction of the discharge opening and accelerates it in this direction to a higher speed.
  • the passage cross section of the feed channel is narrowed by the guide body, so that the gas powder flow is accelerated further.
  • the higher speed results in a stronger electrical charge of the powder particles due to friction on the channel wall and on the outer surface of the guide body.
  • due to the narrowing of the cross-section due to the guide body there is a greater concentration of the powder particles, as a result of which the powder particles slide along the powder channel wall and the surface of the guide body with greater force and become more electrically charged due to friction.
  • the electrical friction charging takes place not only on the inner surface of the feed channel wall, but also on the not much smaller surface of the guide body, so that there is almost a doubling of the friction surface and thus a substantial increase in the electrical friction charging. Due to the conveying effect of the accelerating gas and the accumulation effect of the guide body, less carrier gas is required to convey the powder and thus less energy. Furthermore, the smaller amount of carrier gas has a favorable effect, both on the aforementioned electrical friction charging and on the powder cloud emerging from the discharge opening of the device or the emerging powder spray jet and on the quality of the surface coated with the powder, because less gas also means fewer powder particles bounce off the object.
  • FIG. 1 shows an axial longitudinal section of a spray device according to the invention.
  • the spraying device for coating objects with powder shown in the drawing 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 on a longitudinal section through a pipe section 8 and downstream thereof consists of an insulating material jacket 10 which electrically charges the powder by friction and which 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 frustoconical 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 axially arranged, 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 1 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 impinges 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 gas for the gas curtain 42 is supplied via a channel 48 which runs parallel to the supply channel 2 in housing parts 44 and 46, an annular channel 49 subsequently formed between the housing part 46 and the insulating material jacket 10, via bores 50 in webs 52 which the guide body 26 in Hold supply channel 2, to an axial bore 54 of the guide body 26 and from there to the ring 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 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 derived from the electrically conductive pipe section 8 via its electrical line 24. This avoids the aforementioned saturation of cations or anions between the insulating material jacket 10 and the guide body 26, so that the maximum possible frictional 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 via the electrical line 24 or a separate line to a corresponding electrical potential, preferably to earth potential. 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 Sprühvorrichtung zum Beschichten von Gegenständen mit Pulver Expired EP0163118B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=6237306

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85104954A Expired EP0163118B1 (de) 1984-05-30 1985-04-24 Sprühvorrichtung zum Beschichten von Gegenständen mit Pulver

Country Status (4)

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

Families Citing this family (16)

* 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
SE451954B (sv) * 1985-10-18 1987-11-09 Icab Ind Coating Ab Pulverspruta med spiralformigt krokta laddningskanaler och en diffusoranordning placerad i handtagsdelen
DE3600808A1 (de) * 1986-01-14 1987-07-16 Esb Voehringer Elektrostatische pulverspruehvorrichtung mit triboelektrischer pulveraufladung
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
DE3729713A1 (de) * 1987-09-04 1989-03-23 Gema Ransburg Ag Spruehbeschichtungsvorrichtung fuer pulver zum beschichten von gegenstaenden
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
US5344082A (en) * 1992-10-05 1994-09-06 Nordson Corporation Tribo-electric powder spray gun
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
FR2820344B1 (fr) 2001-02-08 2003-03-14 Eisenmann France Sarl Pulverisateur triboelectrique
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

Family Cites Families (13)

* 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 (enrdf_load_stackoverflow) * 1972-03-13 1974-12-09 Atlas Copco Ab
DD106308A1 (enrdf_load_stackoverflow) * 1972-10-13 1974-06-12
DE2509851C2 (de) * 1975-03-06 1984-03-15 Ransburg-Gema AG, 9015 St.Gallen Pulverzerstäuber mit Prallkörper zum Beschichten von Gegenständen im elektrostatischen Feld
US4090666A (en) * 1976-05-19 1978-05-23 Coors Container Company Gun for tribo charging powder
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
DE2938806A1 (de) * 1978-09-26 1980-04-03 Toyota Motor Co Ltd Triboelektrische pulverspruehpistole
US4225090A (en) * 1979-09-07 1980-09-30 Toyota Jidosha Kogyo Kabushiki Kaisha Device for painting by electrostatic powder spraying
JPS5651257A (en) * 1979-10-03 1981-05-08 Toyota Motor Corp Friction-charged application for granular paint
JPS6134065Y2 (enrdf_load_stackoverflow) * 1980-08-29 1986-10-04
DD232595A3 (de) 1984-02-08 1986-02-05 Verkehrswesen Hochschule Vorrichtung zum elektrokinetischen aufladen von pulverfoermigen stoffen

Also Published As

Publication number Publication date
ES8700972A1 (es) 1986-11-16
DE3420325A1 (de) 1985-12-05
EP0163118A3 (en) 1986-10-08
DE3420325C2 (enrdf_load_stackoverflow) 1987-09-24
ES543590A0 (es) 1986-11-16
EP0163118A2 (de) 1985-12-04
US4659019A (en) 1987-04-21

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