EP2051814B1 - Dispositif de transport d'un materiau de revetement fluide et electriquement conducteur - Google Patents

Dispositif de transport d'un materiau de revetement fluide et electriquement conducteur Download PDF

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Publication number
EP2051814B1
EP2051814B1 EP07785993A EP07785993A EP2051814B1 EP 2051814 B1 EP2051814 B1 EP 2051814B1 EP 07785993 A EP07785993 A EP 07785993A EP 07785993 A EP07785993 A EP 07785993A EP 2051814 B1 EP2051814 B1 EP 2051814B1
Authority
EP
European Patent Office
Prior art keywords
electrical resistance
conveying
shaft
conveying means
pump
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 - Fee Related
Application number
EP07785993A
Other languages
German (de)
English (en)
Other versions
EP2051814A1 (fr
Inventor
Markus Albrecht
Jan Reichler
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.)
Eisenmann Anlagenbau GmbH and Co KG
Original Assignee
Eisenmann Anlagenbau GmbH and Co KG
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 Eisenmann Anlagenbau GmbH and Co KG filed Critical Eisenmann Anlagenbau GmbH and Co KG
Publication of EP2051814A1 publication Critical patent/EP2051814A1/fr
Application granted granted Critical
Publication of EP2051814B1 publication Critical patent/EP2051814B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B05B5/16—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

Definitions

  • the invention relates to a device for conveying an electrically conductive fluid coating material, in particular a lacquer, to an application device lying at high electrical potential, according to the preamble of claim 1.
  • a device for conveying an electrically conductive fluid coating material, in particular a lacquer, to an application device lying at high electrical potential, according to the preamble of claim 1.
  • Such a device is made EP1319439 known.
  • Such devices find particular in the form of paint pumps in surface technology, such.
  • Example in the automotive industry, application to promote electrically conductive coating material to a working by the electrostatic spraying process application device, in particular an injection molding.
  • the coating material to be sprayed in particular an electrically conductive lacquer, is ionized by means of a high-voltage electrode, which is brought to a high electrical potential via a high-voltage generator. Of the ionized paint is then drawn due to electrostatic forces on the lying generally at approximately ground potential to be coated object, such as a car bodywork.
  • Known devices of the type mentioned above comprise a driven by a drive shaft pump unit, wherein the drive shaft is in turn driven by a motor / gear unit. Since the paint is electrically conductive, the high electrical potential at the high voltage electrode is located within all paint-carrying lines and channels. Some components lying in the interior of the pump unit are flowed around in the operation of the application device of the coating material lying at high electrical potential, whereby the pump unit is brought to the high electrical potential of the high voltage electrode.
  • the motor and / or the gearbox are usually grounded and are at approximately ground potential.
  • the drive shaft and, if necessary, other components associated therewith such as e.g. Couplings, made of electrically non-conductive material, with the aim of ensuring an electrical potential separation between the pump unit and the motor / gear unit.
  • the potential reduction, especially at the pumping unit requires a little more than 15 seconds.
  • This warranty is provided by means of a structurally quite complex monitoring device, which in turn requires a high installation and maintenance.
  • the object of the invention is to provide a device of the type mentioned, in which a rapid potential reduction is ensured on the device, so that additional monitoring is unnecessary, if the device is still at too high electrical potential.
  • an electrical resistance device By this arrangement of an electrical resistance device is a usual potential separation between the conveyors and the drive means to a certain extent. Although the funding is electrically connected to the drive means. However, current flowing from the operating means of the application device at a high electrical potential to the drive means held at approximately ground potential can flow only as a function of the magnitude of the electrical resistance of the electrical resistance device. Thus, with a very large electrical resistance, similar to a complete separation of potential between conveying means and drive means, during operation of the application means, the flow of high currents between conveying means and drive means can be prevented.
  • the electrical resistance device makes it possible for the high electrical potential, on which the conveying means lie, to dissipate relatively quickly.
  • the potential reduction can be done so quickly and access to the device after such a short time safely possible that it is acceptable from a safety point of view to dispense with a complex access control ,
  • an electrical resistance of approximately 10 G ⁇ preferably an electrical resistance between 9.4 G ⁇ and 9.8 G ⁇
  • the electrical resistance device It is particularly advantageous if an electrical resistance of approximately 10 G ⁇ , preferably an electrical resistance between 9.4 G ⁇ and 9.8 G ⁇ , is provided by the electrical resistance device.
  • the potential reduction between the drive means and funding takes place in a period of about 2 seconds, when the high voltage power supply of the application device, which is in the order of 70 kV to 80 kV at 50 uA to 80 uA, is interrupted.
  • the power transmission device comprises the electrical resistance device, wherein it is particularly preferred that the power transmission device comprises a drive shaft with an electrically non-conductive shaft tube, in the interior of which the electrical resistance device is arranged.
  • the power transmission device comprises a drive shaft with an electrically non-conductive shaft tube, in the interior of which the electrical resistance device is arranged.
  • the conveying means comprise a pump unit with a pump shaft, which is connected to the drive shaft of the power transmission device.
  • the electrical resistance device comprises an electrical resistance element, which via a first connection path with the drive means and via a second connection path with the conveying means is electrically connected.
  • Each connection path can be designed, for example, simply in the form of electrically conductive cables with corresponding connections.
  • FIG. 1 is denoted by 10 an application device which operates by the electrostatic spraying method.
  • the application device 10 is connected via a line 12 to the output of a high voltage generator 14; a in FIG. 1 schematically indicated to be coated workpiece 16 is grounded and maintained at ground potential substantially.
  • the application device 10 usually operates with a voltage between 70 kV and 80 kV at a current of 50 ⁇ A to 80 ⁇ A.
  • the application device 10 is fed by means of a generally designated 18 paint pump with an electrically conductive paint, to which it is connected via a hose 20 with an outlet 22 of a pump unit 24 of the paint pump 18.
  • the paint pump 18 sucks via an inlet 26 and an associated hose 28 paint from a paint reservoir 30 and promotes this through the pump unit 24 to the outlet 22.
  • Impeller 34 is provided, wherein the pump chamber 32 is on the one hand via a channel 36 to the inlet 26 of the pump unit 24 and on the other hand via a channel 38 with the outlet 22 in connection.
  • the impeller 34 is driven via a pump shaft 40 which extends through a housing 42 of the pump unit 24 to the outside.
  • the impeller 34 is selected only as a simple example of known per se for pumping means.
  • the paint pump 18 comprises a grounded and thus always substantially at ground potential held motor 44 to which a gear 46 is flanged.
  • the transmission 46 is connected to a drive shaft 48, which transmits the engine power to the pump shaft 40.
  • a first sleeve-shaped hub part 52 of a gear coupling 54 is pushed onto a mounting section 50 of the pump shaft 40 lying outside the housing 42 of the pump unit 24 (see FIG. 2 ).
  • the fixation of the hub portion 52 on the pump shaft 40 takes place in a manner known per se by means of a key 56, which is arranged between the mounting portion 50 of the pump shaft 40 and the inner circumferential surface of the hub portion 52.
  • Grub screw 58 is guided by a radial threaded bore 60 of the hub part 52 and presses against the key 56.
  • the hub part 52 engages engaging in one side of a pocket portion 62 of the gear coupling 54, in the other side of a second sleeve-shaped hub portion 64 engaging seated.
  • the second hub part 64 is mounted on a coupling member 66.
  • the attachment of the coupling member 66 in the hub portion 64 is done in the same manner as the attachment of the pump shaft 40 in the first hub portion 52 of the gear coupling 54.
  • the coupling member 66 carries a circumferential counter-collar 68, wherein between this and that of the second hub portion 64 of the Bogenyakkupplung 54 pioneering end of the coupling member 66, an external thread 70 is provided.
  • a shaft tube 72 is screwed, which for this purpose has an internal thread 74 in a corresponding end region.
  • the shaft tube 72 is screwed onto the coupling member 66 so far that it abuts with its end face against the counter-collar 68 of the coupling member 66.
  • the shaft tube 72 has an internal thread 76 and is thus screwed onto a first hub part 78 of a flange coupling 80.
  • the first hub part 78 has a connecting sleeve 82 which carries an external thread 84 complementary to the internal thread 76 of the shaft tube 72.
  • the connecting sleeve 82 merges integrally into a flange disk 86, against which the shaft tube 72 screwed onto the connecting sleeve 82 abuts.
  • the first hub portion 78 of the flange coupling 80 is bolted to a second hub portion 88 of the flange coupling 80.
  • the second hub part 88 has a flange disc 90, which is suitable for the flange disk 86 of the first hub part 78. This goes into a receiving sleeve 92, in which axially the output shaft of the transmission 46 can be inserted, which is not shown in the figures for clarity.
  • the fixation of the second hub portion 88 of the flange 80 on the shaft of the transmission 46 is again in and known per se Way by means of a feather key and a threaded pin, which is guided by a radial bore in the receiving sleeve 92 of the second hub portion 88 of the flange 80.
  • the feather key, the threaded pin and the radial bore for fixing the second hub part 88 of the flange coupling 80 are not specifically provided with a reference numeral.
  • the inner bore of the ferrule 82 of the first hub portion 78 continues in the flange 86, so that the first hub portion 78 of the flange 80 has a total of an axial through hole 94.
  • the second hub portion 88 of the flange 80 has an axial through hole; this is designated 96.
  • the through-holes 94, 96 of the flange coupling 80 is an electrically conductive contact pin 98 in such a way that it with a first end portion 100 in the through hole 94 of the first hub portion 78 and a second end portion 102 in the through hole 96 of the second hub portion 88 of Flange coupling 80 is located.
  • the second end portion 102 of the contact pin 98 carries a circumferential collar 104 against which abuts a pushed from the side of the first end portion 100 of the contact pin 98 coil spring 106 made of an electrically conductive material.
  • the coil spring 106 extends in the relaxed state beyond the free end of the first end portion 100 of the contact pin 98 addition.
  • the direction away from the contact pin 98 end of the coil spring 106th is applied to a contact element 108, which is screwed into the provided with an internal thread through hole 94 of the first hub portion 78 of the flange 80, from the flange 86 opposite side of the first hub portion 78 ago.
  • the contact element 108 in turn has an externally accessible receptacle 110, in which a plug 112 is seated, which is connected via a running inside the shaft tube 72 line 114 to one end of a resistive element 116, which is located in the interior of the shaft tube 72.
  • the opposite end of the resistance element 116 is connected via a further extending in the interior of the shaft tube 72 line 118 with the coupling member 66 at the flange 80 opposite end of the shaft tube 72.
  • the coupling member 66 Coaxially to its axis, the coupling member 66 on its inside of the gear coupling 54 facing end face on a stepped blind bore 120, in the inner, having the smaller diameter portion, an end portion of an electrically conductive contact pin 122 extends.
  • a section of the contact pin 122 separated from this end section by a radially projecting collar is surrounded by a helical spring 124 made of an electrically conductive material, which has one end on the collar of the contact pin 122 and with the opposite end inside the first hub part 52 of the gear coupling 54 on the end face of the mounting portion 50 of the pump shaft 40 abuts.
  • the shaft tube 72 is made of an electrically non-conductive material.
  • the corrugated tube 72 is filled with an electrically non-conductive filler material, such as a plastic or a resin, which includes the resistive element 116 and the outgoing lines 114 and 118 thereof.
  • Leading the coupling member 66 line 118 in the shaft tube 72 may be connected to the coupling member 66 via a plug in a similar manner as has been described for the line 114 and its connection to the contact element 108.
  • the electrical resistance element 116 is selected to provide an electrical resistance of about 10 G ⁇ , in particular an electrical resistance between 9.4 G ⁇ and 9, 8 G ⁇ .
  • the pump unit 24 is conductively connected to the transmission 46 and above with the motor 44. Due to the high-resistance electrical resistance of the electrical resistance element 116, only a small amount of harmless current can flow from the pump unit 24 which is at high electrical potential during operation of the application device 10 to the motor 44 which is held at approximately ground potential.

Claims (6)

  1. Dispositif de transport d'un matériau de revêtement fluide et électriquement conducteur, en particulier d'une peinture, vers un dispositif d'application porté à un potentiel électrique élevé, comprenant
    a) des moyens d'entraînement (44, 46) qui peuvent être reliés au potentiel de la masse ;
    b) des moyens de transport (24) pouvant être entraînés par les moyens d'entraînement (44, 46), au moyen desquels le matériau de revêtement peut être transporté vers le dispositif d'application (10) ;
    c) un dispositif de transmission de force (54, 48, 80) via lequel les moyens d'entraînement (44, 46) sont couplés aux moyens de transport (24) pour l'entraînement des moyens de transport (24) ;
    d) un dispositif à résistance électrique (116), lequel est en contact avec les moyens d'entraînement (44) et les moyens de transport (24),
    caractérisé en ce
    que le dispositif à résistance (116) met à disposition la seule liaison électriquement conductrice entre les moyens de transport (24) et les moyens d'entraînement (44, 46).
  2. Dispositif selon la revendication 1, caractérisé en ce que le dispositif à résistance électrique (116) met à disposition une résistance électrique d'environ 10 GΩ, de préférence une résistance électrique comprise entre 9,4 GΩ et 9,8 GΩ.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le dispositif de transmission de force (54, 48, 80) comprend le dispositif à résistance électrique (116).
  4. Dispositif selon la revendication 3, caractérisé en ce que le dispositif de transmission de force (46, 48) comprend un arbre d'entraînement (48) avec un tube d'arbre (72) électriquement non conducteur, à l'intérieur duquel est disposé le dispositif à résistance électrique (116).
  5. Dispositif selon la revendication 4, caractérisé en ce que les moyens de transport (24) comprennent une unité de pompage (24) avec un arbre de pompe (40), lequel est relié à l'arbre d'entraînement (48) du dispositif de transmission de force (54, 48, 80).
  6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que le dispositif à résistance électrique (116) comprend un élément à résistance électrique (116), lequel est relié électroniquement aux moyens d'entraînement (44) via un premier chemin de liaison (114, 108, 98, 46) et aux moyens de transport (24) via un deuxième chemin de liaison (118, 66, 122).
EP07785993A 2006-08-17 2007-07-11 Dispositif de transport d'un materiau de revetement fluide et electriquement conducteur Expired - Fee Related EP2051814B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006038563A DE102006038563A1 (de) 2006-08-17 2006-08-17 Vorrichtung zum Fördern eines elektrisch leitfähigen fluiden Beschichtungsmaterials
PCT/EP2007/006134 WO2008019736A1 (fr) 2006-08-17 2007-07-11 dispositif de transport d'un matériau de revêtement fluide et électriquement conducteur

Publications (2)

Publication Number Publication Date
EP2051814A1 EP2051814A1 (fr) 2009-04-29
EP2051814B1 true EP2051814B1 (fr) 2009-11-25

Family

ID=38626801

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07785993A Expired - Fee Related EP2051814B1 (fr) 2006-08-17 2007-07-11 Dispositif de transport d'un materiau de revetement fluide et electriquement conducteur

Country Status (4)

Country Link
EP (1) EP2051814B1 (fr)
DE (2) DE102006038563A1 (fr)
NO (1) NO20091136L (fr)
WO (1) WO2008019736A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012001563B4 (de) * 2012-01-27 2019-05-09 Dürr Systems Ag Lackierkabine mit einer Beschichtungsmittelleitung und entsprechendes Herstellungsverfahren für die Beschichtungsmittelleitung
CN103433162A (zh) * 2013-08-22 2013-12-11 深圳市远东盛业科技有限公司 一种水性涂料静电系统
DE102022115557A1 (de) 2022-06-22 2023-12-28 Prominent Gmbh Potenzialausgleich für eine Dosierpumpe

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155539A (en) * 1958-11-20 1964-11-03 James W Juvinall Electrostatic spray coating methods and apparatus
FR1275476A (fr) * 1960-09-20 1961-11-10 Procédé et dispositif d'application électrostatique de peinture
US3145930A (en) * 1961-01-05 1964-08-25 Metallgesellschaft Ag Electrostatic paint spraying apparatus for changing liquids
DE3717929A1 (de) * 1987-05-27 1988-12-08 Behr Industrieanlagen Verfahren und anlage zum elektrostatischen beschichten mit leitfaehigem material
DE4433113C2 (de) * 1994-09-16 1998-12-17 Wagner Int Einrichtung zum Aufladen und Abgeben elektrisch leitfähigen Sprühgutes
DE10161550A1 (de) * 2001-12-14 2003-06-18 Duerr Systems Gmbh Sensoranordnung für ein auf Hochspannungspotential liegendes Teil einer Beschichtungsanlage
MXPA04010977A (es) * 2002-05-07 2005-02-14 Behr Systems Inc Metodo y aparato para suministrar y aplicar una pintura electricamente conductiva.
DE10233633B4 (de) * 2002-07-24 2005-09-01 Dürr Systems GmbH Vorrichtung zum Dosieren oder Fördern eines auf Hochspannungspotential aufgeladenen Beschichtungsmittels in einer Beschichtungsanlage

Also Published As

Publication number Publication date
EP2051814A1 (fr) 2009-04-29
WO2008019736A1 (fr) 2008-02-21
NO20091136L (no) 2009-03-16
DE502007002125D1 (de) 2010-01-07
DE102006038563A1 (de) 2008-04-30

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