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EP1384515B1 - Compensateur de charge pour un atomiseur rotatif - Google Patents

Compensateur de charge pour un atomiseur rotatif Download PDF

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Publication number
EP1384515B1
EP1384515B1 EP03016152A EP03016152A EP1384515B1 EP 1384515 B1 EP1384515 B1 EP 1384515B1 EP 03016152 A EP03016152 A EP 03016152A EP 03016152 A EP03016152 A EP 03016152A EP 1384515 B1 EP1384515 B1 EP 1384515B1
Authority
EP
European Patent Office
Prior art keywords
shaft
potential
bearing
balancing device
bearing unit
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
EP03016152A
Other languages
German (de)
English (en)
Other versions
EP1384515A1 (fr
Inventor
Michael Baumann
Frank Herre
Hans-Jürgen Dr. Nolte
Harry Krumma
Stefano Giuliano
Björn Lind
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.)
Duerr Systems AG
Original Assignee
Duerr Systems 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 Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP1384515A1 publication Critical patent/EP1384515A1/fr
Application granted granted Critical
Publication of EP1384515B1 publication Critical patent/EP1384515B1/fr
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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0415—Driving means; Parts thereof, e.g. turbine, shaft, bearings

Definitions

  • the invention relates to a potential equalization arrangement for an electrostatic rotary atomizer according to the preamble of claim 1.
  • the invention has for its object to provide an arrangement, the permanently reliable and not due to maintenance errors endangered equipotential bonding between the shaft and the storage unit of an electrostatic rotary atomizer guaranteed.
  • the equipotential bonding can be wear-free and easier as before, since the invention without the hitherto used as an additional component contact ring as even without a manually adjustable electrode.
  • the Transfer of electrical charges can be solely by the special Surface structure with pointed elements between the Shaft and the desired potential supplying part of the storage unit be effected.
  • the pointed elements are e.g. from thread-like about the outer surface of the shaft part and / or order the inner surface of the bearing part extending edges, so it not to the typical for point discharges wear caused by unwanted spark erosion.
  • the edges of the two threads are each point-like adjacent to points with the rotation of the wave.
  • the electrical discharge takes place here at the crossing points the different or opposite oblique thread instead, since the radial distance is the lowest here, and because of the continuous displacement of the crossing points Wear-free point discharge is possible.
  • At least on one of the two opposite ones Surfaces can also be circular without gradient be. If edges are only on one surface, should it be to generate a corona discharge to the negative charged surface act. By the way, it may be enough if the edges only from individual, not extending over 360 ° Segments exist.
  • Fig. 1 the storage unit of an electrostatic rotary atomizer shown, whose rotating bell plate (not shown) in a known manner in the in the drawing left end of a hollow shaft 1 can be screwed.
  • the wave 1 is mounted in the housing part 2 of the storage unit, wherein the Air gap 3 between the shaft 1 and the cylindrical inner surface of the housing part 2 also in a conventional manner serves as an air bearing.
  • the housing part 2 and the one with the bell plate connected part of the shaft 1 are subject to the operation of the Atomizer of electric charge by that of the electrodes the atomizer generated high voltage field, as by the Arrows 6 is indicated.
  • the shaft 1 At its end facing away from the bell plate, the shaft 1 in a grounded at 5 equipotential bonding housing 4 of the storage unit stored and in turn grounded contactless.
  • the shaft For contactless Earthing the shaft is its end part 1 'on the in the Housing 4 located part of its scope as shown provided with a thread whose pointed protruding edges. 8 the edges 9 of a similarly shaped internal thread in the cylindrical Face the inner surface of the housing 4.
  • the radial Distance between the edges 8 and 9 of the two threads is so small that between them electrical discharges in Ensures the required for the desired equipotential bonding dimensions are as indicated by the arrows 7.
  • Of the Air gap between the cylindrical end portion 1 'of the shaft 1 and the cylindrical bearing surface of the housing 4 should in the area the discharge path formed by the thread approximately the same size as the air gap 3 in the remaining area the shaft bearing.
  • Fig. 2 which shows the course of the thread of the End part 1 'of the shaft with the edges 8 with respect to a settlement the cylindrical inner surface of the housing 4 with the thread edges 9 shows, the two threads have opposite one another Gradient directions (right- or left-hand thread).
  • the edges 8 and 9 are not parallel, but crossing each other, it comes at the crossroads 10 to point discharges similar to needle points, but without the erosion effect of discharges at stationary points, since the crossing points 10 according to the wave rotation along wander both edge groups.
  • the housing part 2 of the grounded equipotential housing 4 through an insulating layer 12 or other insulation to separate.
  • the housing part 2 may be appropriate e.g. be grounded via a high-impedance resistor 13.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Claims (9)

  1. Dispositif d'équilibrage de potentiel pour un pulvérisateur électrostatique à rotation, dont le plateau en cloche tourne dans la zone d'un champ de haute tension ou est placé sur de la haute tension, avec une unité de palier (2, 4) fixe pour l'arbre du plateau en cloche,
    avec une partie (4), posée sur un potentiel fixe, de l'unité de palier, dans laquelle une partie (1') électroconductrice de l'arbre (1) ou une partie reliée de façon électroconductrice à l'arbre tourne, et
    avec un dispositif pour la transmission de charge électrique entre la partie (1') conductrice de l'arbre et la partie (4) fixe au niveau du potentiel de l'unité de palier,
    caractérisé en ce que le dispositif pour la transmission de charge est formé par une ou plus d'une arête (8, 9) pointue, dépassant de la surface de la partie (1') conductrice de l'arbre (1) et/ou d'une surface de la partie (4) à potentiel fixe de l'unité de palier, qui sont agencées au moyen d'au moins un segment d'angle en forme d'anneau ou de spirale autour de la surface extérieure de la partie d'arbre (1) et/ou autour de la surface intérieure de la partie de palier (4) à potentiel fixe.
  2. Dispositif d'équilibrage de potentiel selon la revendication 1, caractérisé en ce que les arêtes formées en se faisant face dans la surface extérieure de la partie d'arbre (1') et dans la surface intérieure de la partie de palier (4) et en forme de spirale au moins sur une surface ont des sens de pente différents, de sorte que les arêtes (8, 9) sont voisines à chaque fois de façon ponctuelle avec des points (10) migrant lors de la rotation de l'arbre (1).
  3. Dispositif d'équilibrage de potentiel selon la revendication 2, caractérisé en ce que les arêtes (8, 9) ont des pentes opposées l'une par rapport à l'autre.
  4. Dispositif d'équilibrage de potentiel selon l'une quelconque des revendications précédentes, caractérisé en ce que des arêtes pointues sont prévues au moins sur la surface chargée de façon négative.
  5. Dispositif d'équilibrage de potentiel selon la revendication 1, caractérisé en ce qu'une bride dépassant de l'arbre et/ou de la partie à potentiel fixe, entourant l'arbre, de l'unité de palier est prévue pour la transmission de charge.
  6. Dispositif d'équilibrage de potentiel selon l'une quelconque des revendications précédentes, caractérisé en ce que l'arbre (1) est monté sur un palier d'air (3) et en ce que l'extrémité (1') opposée au plateau en cloche ou une partie, se trouvant à proximité du plateau en cloche, de l'arbre tourne dans la partie (4), à potentiel fixe, de l'unité de palier et les arêtes (8, 9) pointues et saillantes se trouvent dans ou sur le palier d'air formé entre l'arbre (1) et l'unité de palier.
  7. Dispositif d'équilibrage de potentiel selon l'une quelconque des revendications précédentes, caractérisé en ce que la fente entre l'arbre (1') et la partie de palier (4), à potentiel fixe et l'enveloppant, présente dans la zone du dispositif pour la transmission de charge (8, 9) au moins approximativement la même grandeur que la fente (3) formant le palier d'air de l'arbre (1) dans la zone restante de l'unité de palier ou est inférieure.
  8. Dispositif d'équilibrage de potentiel selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie (2), opposée au plateau en cloche, de l'unité de palier est séparée de sa partie (4), fixe au niveau du potentiel, par un système isolant (12) et est placée à un potentiel fixe moyen d'une résistance (13) à haute impédance.
  9. Pulvérisateur à rotation avec un dispositif d'équilibrage de potentiel selon l'une quelconque des revendications précédentes.
EP03016152A 2002-07-22 2003-07-16 Compensateur de charge pour un atomiseur rotatif Expired - Lifetime EP1384515B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10233197A DE10233197A1 (de) 2002-07-22 2002-07-22 Potentialausgleichsanordnung für einen elektrostatischen Rotationszerstäuber
DE10233197 2002-07-22

Publications (2)

Publication Number Publication Date
EP1384515A1 EP1384515A1 (fr) 2004-01-28
EP1384515B1 true EP1384515B1 (fr) 2005-10-12

Family

ID=29796496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03016152A Expired - Lifetime EP1384515B1 (fr) 2002-07-22 2003-07-16 Compensateur de charge pour un atomiseur rotatif

Country Status (5)

Country Link
US (2) US20040135016A1 (fr)
EP (1) EP1384515B1 (fr)
AT (1) ATE306329T1 (fr)
DE (2) DE10233197A1 (fr)
ES (1) ES2249663T3 (fr)

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US7898005B2 (en) * 2002-12-09 2011-03-01 The Regents Of The University Of California Inorganic nanotubes and electro-fluidic devices fabricated therefrom
US8199453B2 (en) 2003-03-17 2012-06-12 Illinois Tool Works Inc. Shaft current control brush ring assembly
US7136271B2 (en) * 2003-03-17 2006-11-14 Illinois Tool Works Inc Static charge neutralizing assembly for use on rollers and shafts
US7193836B2 (en) 2003-03-17 2007-03-20 Illinois Tool Works Inc Grounding brush for mitigating electrical current on motor shafts
US7339777B2 (en) 2006-01-12 2008-03-04 Illinois Tool Works Inc Grounding system for a rotating shaft
US20070278093A1 (en) * 2006-06-02 2007-12-06 Barnard Michael P Electrical conductive contact ring for electroplating or electrodeposition
US7520450B2 (en) * 2006-10-10 2009-04-21 Illinois Tool Works Inc. Electrical connections for coating material dispensing equipment
JP4347372B2 (ja) * 2007-08-10 2009-10-21 トヨタ自動車株式会社 静電塗装装置
US8421286B2 (en) * 2008-07-03 2013-04-16 Nidec Motor Corporation Kit and method for attaching a grounding ring to an electrical motor
US9917491B2 (en) 2014-03-07 2018-03-13 Nidec Motor Corporation Ground ring and enclosure in an electric motor
US9970481B1 (en) 2017-09-29 2018-05-15 Efc Systems, Inc. Rotary coating atomizer having vibration damping air bearings

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Also Published As

Publication number Publication date
US20060157597A1 (en) 2006-07-20
ATE306329T1 (de) 2005-10-15
US8840050B2 (en) 2014-09-23
US20040135016A1 (en) 2004-07-15
EP1384515A1 (fr) 2004-01-28
DE10233197A1 (de) 2004-02-05
ES2249663T3 (es) 2006-04-01
DE50301338D1 (de) 2005-11-17

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