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EP1045732A1 - Dispositif pour isoler un milieu en ecoulement electroconducteur - Google Patents

Dispositif pour isoler un milieu en ecoulement electroconducteur

Info

Publication number
EP1045732A1
EP1045732A1 EP98966550A EP98966550A EP1045732A1 EP 1045732 A1 EP1045732 A1 EP 1045732A1 EP 98966550 A EP98966550 A EP 98966550A EP 98966550 A EP98966550 A EP 98966550A EP 1045732 A1 EP1045732 A1 EP 1045732A1
Authority
EP
European Patent Office
Prior art keywords
electrically conductive
potential
flow path
nozzle needle
closure piece
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
EP98966550A
Other languages
German (de)
English (en)
Other versions
EP1045732B1 (fr
Inventor
Burkhard Bilz
Udo Klein
Winfried Ott
Rainer Prauser
Thomas Scholz
Frank Wirth
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.)
Lactec GmbH Gesellschaft fuer Moderne Lackiertechnik
Lactec GmbH
Original Assignee
Lactec GmbH Gesellschaft fuer Moderne Lackiertechnik
Lactec 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 Lactec GmbH Gesellschaft fuer Moderne Lackiertechnik, Lactec GmbH filed Critical Lactec GmbH Gesellschaft fuer Moderne Lackiertechnik
Publication of EP1045732A1 publication Critical patent/EP1045732A1/fr
Application granted granted Critical
Publication of EP1045732B1 publication Critical patent/EP1045732B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1658—Details
    • B05B5/1666—Voltage blocking valves, e.g. with axially separable coupling elements
    • 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material

Definitions

  • the invention relates to a method and a device for isolating points of an electrically conductive flow medium with different electrical potential along its flow path according to the preambles of claims 1 and £ > '..
  • the invention is therefore based on the object of providing measures by means of which a particularly expedient handling and safe insulation of points of the flow path and / or of the electrically conductive flow medium located at different electrical potentials is possible.
  • the invention provides the features of the characterizing part of claim 1.
  • electrically conductive liquid does not come into contact with walls that come into contact, so that there is also little risk that the clocked surfaces forming film of electrically conductive liquid finally leads to a short circuit.
  • the potential isolation valve serving as the potential isolation device also preferably has an electrically insulating liquid in its chamber receiving the lance or nozzle needle.
  • the potential isolating valve comprises end pieces for the flow path which can be connected and detached according to the invention, these end pieces being at the same time in the electrically insulating liquid. It is therefore possible to provide a high-quality potential isolating device of small size, which can be easily and conveniently handled with a high switching speed.
  • Fig. 1 in section a potential isolating device in the open state
  • Fig. 2 a section as in Fig. 1 shortly before closing the flow path
  • a potential isolating device connected as a potential isolating valve 1 comprises a multi-part housing 2, which mainly consists of an insulating material. It comprises a centrally arranged, cylindrical housing part 3 as well as covers 6, 7, which close its interior and have ends 5 on each end side.
  • the housing 2 there are intermediate walls 8 and 9 which are arranged at a distance from one another and at a distance from the covers 6 and 7 -
  • the 8 and 9 form chambers 10, 11 and 12 on the one hand in the interior of the housing 2 and also serve for the storage and guidance of components, with the aid of which a flow medium from a first point 13 of a flow path 1 to a second point 15 with a depending on the electrical switching state other electrical potential can flow.
  • the components therefore serve to connect and interrupt the flow path 14 of the electrically conductive flow medium.
  • the component forming the first point 13 is the free end 16 of a nozzle needle 17.
  • the nozzle needle 17 has a longitudinal channel 18 and is connected, for example, to a line having a low electrical potential. Accordingly, the flow medium located in the nozzle needle 17 also has a low electrical potential.
  • a drive 19 is assigned to the nozzle needle 17, with the aid of which the nozzle needle 17 is relative to the second position. le of this drive 15 is movable to be joined "or one another to be dissolved components. 19 includes pistons 20 and 21 via terminals 22 and 23 are acted upon in such a way that the nozzle needle is movable in at least two directions 17, such as from the Fig. 1. Compressed air supplied via lines 27 and 27a serves as the pressure medium.
  • the free end 16 of the nozzle needle 17 (FIG. 1) is located in the middle chamber 11, which is always filled with insulating liquid, and, according to the exemplary embodiment, is closed at the end.
  • the flow path 1 or the longitudinal channel 18 ends in the nozzle needle 17 at at least one radially directed outlet opening 29, as can be seen in particular from the illustration of FIG. 3 shown on a larger scale.
  • An annular channel 30 is assigned to the or the radially directed outlet openings 29 and forms a housing-side receiving opening and leads to an outwardly directed outlet opening 31.
  • the annular channel 30 is located in the intermediate wall 8 and is arranged there in such a way that it is open when the potential isolation valve is open 1 is covered by a closure piece 32 according to FIG. 1.
  • This closure piece 32 can be moved relative to the nozzle needle 17 and is arranged in its axis and is acted upon, for example, by the pressure force of a spring 33 in the closing direction (FIGS. 1 and 2).
  • the closure piece 32 On its end face facing the nozzle needle 17, the closure piece 32 has a recess 34, into which a centering piece 35 at the free end 16 of the nozzle needle 17 initially engages when the potential-isolation valve 1 is closed, as is shown in FIG. 2. Then, when the nozzle needle 17 is moved from the position shown in FIG. 2 even further in the axial direction towards the cover 6, the closure piece 32 moves into that in FIG. 3 shown position to the left until it releases the ring channel 30. At the same time, the outlet openings 29 of the longitudinal channel 18 of the nozzle needle 17 move from the position in FIG. 2 to the left until they are in front of the ring channel 30 (FIG. 3).
  • the outlet openings 29 are covered by a sleeve 50 arranged axially displaceably on the nozzle needle 17.
  • This sleeve 50 is acted upon by a compression spring 51 and also has a stop 52.
  • the stop 52 encounters a resistance, so that the sleeve 50 can no longer move in the axial direction to the left despite a further movement of the nozzle needle 17 (FIG. 3) and the outlet opening 29 releases.
  • the flow medium or the electrically conductive liquid can flow through the nozzle needle 17 to the housing-side outlet opening 31, the nozzle needle 17 forming an end piece of the flow path 1, while the second end piece of the flow path 14 is arranged on the housing side.
  • the nozzle needle 17 is a hollow valve needle or a freely projecting carrier 17 ', in the interior 18' of which the electrically conductive flow medium flows.
  • This carrier 17 ' moves itself between a first or separation position and a docking position according to FIG. 3, in which the electrically conductive liquid can flow. Basically, the carrier 17 'also moves back again as soon as the overflow process has ended.
  • the Austrittsöf openings 29 at the free end of the carrier 17 ' are only open in the docking position and otherwise with the sleeve 50 serving as a closure piece on the side of the movable nozzle needle 17th closed.
  • the ring channel 30 arranged on the housing side is always closed with the aid of the closure piece 32 when the nozzle needle 17 is in the disconnected position and is only open when the nozzle needle 17 has reached the docking position.
  • the main consequence of this is that the electrically conductive liquid flows without contact with boundary walls which move relative to one another when the potential isolating device is opened and closed.
  • the flow path 14 is formed on the housing side by the annular channel 30 and the associated outlet opening 31, it also being understood that the direction of flow for the electrically conductive flow medium can also be opposite.
  • a piston 3 located in the chamber 10 is also assigned to the closure piece 32 and is supplied with a pressure medium via a line 37.
  • sealing elements 40 are also required for all pistons and the closure piece 32 and between the covers 6, 7 and the various built-in parts and for sealing the nozzle needle 17 and are shown in the figures.
  • a sealing element 41 arranged on the end face of the sleeve 50, 3, which rests on the facing end face of the centering piece 35 after leaving the docking position according to FIG. 3.
  • two sealing elements 42 and 4-3 arranged at a distance from one another encompass the sleeve 50 in the docked state.
  • the sealing element 4-2 on the ring channel side also serves as a wiping element and an annular channel 44 located in the intermediate wall 8 between the two sealing elements and 43 leads to the above-mentioned line 28 and the connection 25.
  • Any electrically conductive liquid which has been introduced should collect here and through which Connection 25 are derived.
  • the invention essentially consists of a potential isolation valve which can be arranged between an earthed paint supply line and a working container or between the working container and an atomizer connected to high voltage.
  • the potential-isolation valve designed as a hollow needle valve comprises a paint supply lance which, for example, is located at ground potential with exclusion of air in the chamber filled with the liquid insulating medium and can be displaced at a short distance from a docking station optionally at high voltage or ground potential and is preferably pneumatically actuated Feed device can be inserted into the docking station.
  • the docking station in turn forms a valve that keeps the path to a downstream work container closed as long as the paint supply lance is not docked and opens when the lance is docked in such a way that the paint material present in the hollow needle valve is reliably protected from the surrounding insulating medium.
  • the docking station encloses the inserted hollow needle valve in an airtight and liquid-tight manner, the hollow needle valve only opening when docked and enclosed by an outer sleeve of the docking station.
  • the piston carrying the paint supply lance / nozzle needle 17 also cleans the interior wall of the chamber receiving it from deposits during its movements.
  • the piston therefore simultaneously serves as a circulation pump for the insulating medium during its docking and undocking movement.
  • the longitudinal channel 18 in the nozzle needle 17 is the interior 18 'of a freely projecting carrier 17' which can be moved from a separation position into a docking position so that the electrically conductive liquid can then flow over it.
  • the annular channel 30 serves as the take-over opening on the housing side and is only opened in the docking position, just as this applies to the outlet opening 29 on the freely projecting carrier 17 ′ or on the nozzle needle 17.
  • the various parts are manufactured from generally known materials, some of which also use insulating materials.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour isoler deux points (13 et 15) d'un milieu en écoulement électroconducteur, présentant un potentiel électrique différent, le long d'une voie d'écoulement dans un séparateur de potentiel. L'essence de l'invention consiste en ce que le milieu en écoulement électroconducteur est véhiculé à l'intérieur (18') d'un support (17') faisant librement saillie et présentant au moins un orifice de sortie (29), ce support se mouvant entre une première position ou position de séparation et une position de mise en place en vue du transfert et inversement, et en ce que l'orifice de sortie (29) est fermé jusqu'à ce que la position de mise en place soit atteinte.
EP98966550A 1997-12-18 1998-12-15 Dispositif pour isoler un milieu en ecoulement electroconducteur Expired - Lifetime EP1045732B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19756488 1997-12-18
DE19756488A DE19756488A1 (de) 1997-12-18 1997-12-18 Verfahren und Vorrichtung zum Isolieren eines elektrisch leitenden Strömungsmediums
PCT/DE1998/003693 WO1999032231A1 (fr) 1997-12-18 1998-12-15 Procede et dispositif pour isoler un milieu en ecoulement electroconducteur

Publications (2)

Publication Number Publication Date
EP1045732A1 true EP1045732A1 (fr) 2000-10-25
EP1045732B1 EP1045732B1 (fr) 2003-11-05

Family

ID=7852509

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98966550A Expired - Lifetime EP1045732B1 (fr) 1997-12-18 1998-12-15 Dispositif pour isoler un milieu en ecoulement electroconducteur

Country Status (4)

Country Link
US (1) US6422491B1 (fr)
EP (1) EP1045732B1 (fr)
DE (2) DE19756488A1 (fr)
WO (1) WO1999032231A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10049541B4 (de) * 2000-10-06 2006-10-26 LacTec Gesellschaft für moderne Lackiertechnik GmbH Verfahren und Vorrichtung zum Abgeben eines dosierten Flüssigkeitsstroms
DE10059041C2 (de) 2000-11-28 2002-11-14 Lactec Ges Fuer Moderne Lackte Verfahren und Vorrichtung zum Fördern von elektrisch leitfähigen Lacken zwischen unterschiedlichen Spannungspotenzialen
DE10211244A1 (de) 2002-03-13 2003-10-23 Lactec Ges Fuer Moderne Lackte Lackieranlage zum Aufbringen von flüssigem Beschichtungsmaterial
DE102007023931A1 (de) 2007-05-23 2008-12-04 Dürr Systems GmbH Kolbenstangendichtung für einen Isolationszylinder einer Beschichtungsanlage
JP4347372B2 (ja) * 2007-08-10 2009-10-21 トヨタ自動車株式会社 静電塗装装置
EP2595757B1 (fr) 2010-07-21 2017-11-01 Valspar Sourcing, Inc. Appareil et procédé de pulvérisation électrostatique
EP2581136A1 (fr) 2011-10-12 2013-04-17 LacTec GmbH Dispositif de transport pour liquides et installation de laquage

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Publication number Priority date Publication date Assignee Title
NL187613C (nl) * 1978-01-11 1991-12-02 Akzo Nv Inrichting voor het elektrostatisch verspuiten van elektrisch geleidende lak.
US4313475B1 (en) 1980-06-26 1994-07-12 Nordson Corp Voltage block system for electrostatic coating with conductive materials
SE449451B (sv) * 1986-03-24 1987-05-04 Leif Tilly Sett och anordning att tillfora ett elektriskt ledande, flytande medium fran ett forradssystem till en forbrukningsstation
FR2654365B1 (fr) 1989-11-14 1992-02-21 Sames Sa Installation d'application de produit de revetement conducteur, par voie electrostatique.
FR2656460B1 (fr) 1989-12-22 1994-02-11 Sames Sa Dispositif d'isolation electrique formant element de conduit et installation comportant un tel dispositif.
DE4013940A1 (de) 1990-04-30 1991-10-31 Behr Industrieanlagen Verfahren und anlage zum serienweisen beschichten von werkstuecken mit leitfaehigem beschichtungsmaterial
DE4013938A1 (de) 1990-04-30 1991-10-31 Behr Industrieanlagen Verfahren und anlage zum serienweisen beschichten von werkstuecken mit leitfaehigem beschichtungsmaterial
DE4013941A1 (de) 1990-04-30 1991-10-31 Behr Industrieanlagen Anlage zum serienweisen beschichten von werkstuecken mit leitfaehigem beschichtungsmaterial
US5197676A (en) 1990-07-18 1993-03-30 Nordson Corporation Apparatus for dispensing conductive coating materials
FR2695327B1 (fr) 1992-09-09 1995-07-07 Sames Sa Dispositif de projection électrostatique de produit de revêtement électriquement conducteur, muni d'un réservoir isolé adapté à contenir un tel produit.
US5364035A (en) 1993-12-20 1994-11-15 Graco Inc. High voltage sealing and isolation via dynamic seals
US5944045A (en) 1994-07-12 1999-08-31 Ransburg Corporation Solvent circuit
US5526986A (en) * 1994-11-01 1996-06-18 Graco Inc Waterbase voltage block and paint valve
DE4444671A1 (de) * 1994-12-15 1996-06-20 Abb Patent Gmbh Lackförderpumpe
DE19620577A1 (de) * 1996-05-22 1997-11-27 Abb Research Ltd Kolbenventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9932231A1 *

Also Published As

Publication number Publication date
US6422491B1 (en) 2002-07-23
WO1999032231A1 (fr) 1999-07-01
DE19756488A1 (de) 1999-07-01
EP1045732B1 (fr) 2003-11-05
DE59810110D1 (de) 2003-12-11

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