EP2794116A1 - Elektrodenanordnung und elektrostatischer zerstäuber mit einer solchen - Google Patents
Elektrodenanordnung und elektrostatischer zerstäuber mit einer solchenInfo
- Publication number
- EP2794116A1 EP2794116A1 EP12809599.9A EP12809599A EP2794116A1 EP 2794116 A1 EP2794116 A1 EP 2794116A1 EP 12809599 A EP12809599 A EP 12809599A EP 2794116 A1 EP2794116 A1 EP 2794116A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- resistance
- electrode arrangement
- arrangement according
- carrier substrate
- 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
Links
- 239000000758 substrate Substances 0.000 claims abstract description 30
- 230000005684 electric field Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 12
- 239000004020 conductor Substances 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 101100400378 Mus musculus Marveld2 gene Proteins 0.000 claims 1
- 239000003973 paint Substances 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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
- B05B5/053—Arrangements for supplying power, e.g. charging power
- B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
-
- 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
Definitions
- the invention relates to an electrode arrangement for an electrostatic atomizer, in particular for an electrostatic rotary atomizer, with a) at least one outer electrode; b) an electrical resistance device which comprises at least one resistance unit which is connected via an electrode connection to the at least one outer electrode and can be connected via a contact connection to a pole of a high-voltage source; wherein c) the electrode assembly defines a major axis to
- the invention relates to an electrostatic atomizer, in particular an electrostatic atomizer.
- Electrostatic sprayers are used, for example, in the automotive industry for coating articles such as vehicle bodies or body parts.
- the coating material for example a lacquer
- the coating material is dispensed by a dispensing device and exposed to an electric field in which the dispensed coating material is ionized and transported to the object due to electrostatic forces, which is at ground potential, for example.
- the dispenser In a rotary atomizer, the dispenser is designed as a rotating bell cup, from the smallest paint droplets are thrown off, so that forms a paint mist.
- the ionization of the paint or the paint particles can be done in such atomizers by a so-called internal charging.
- internal charging the paint passes inside the rotary atomizer on its way to the bell cup over a high-voltage inner electrode, wherein it receives electrical charges.
- electrostatic atomizers with an electrode assembly of the type mentioned, which comprises at least one outer electrode the ionization of the paint or the paint particles is carried out by a so-called external charging.
- a so-called external charging As a rule, a plurality of external electrodes are arranged around the bell cup, through which the intermediate air is ionized. The initially neutral paint particles are charged as they pass through the ionized air and in this way also ionized.
- a rotary atomizer with external charging is known, for example, from DE 196 11 369 A1 or DE 34 29 075 A1.
- the resistance device serves as a damping resistor and prevents rapid changes in current. As a result, e.g. It can be prevented that undesirable flashovers from the outer electrodes to the object to be coated, when the high-rotation atomizer is unintentionally brought close to a grounded object zoom.
- the resistance per outer electrode is usually between 100 MOhm and 150 MOhm at a high voltage potential of about 50 kV.
- the external electrodes are quite long in such external-charged rotary atomizers and protrude relatively far in the direction of the main axis, which as a rule also sticks out the axis of rotation of the bell plate coincides, from the front.
- use of the rotary atomizer in spatially narrower local conditions is often only possible to a limited extent.
- the resistance unit comprises a resistance path running between the electrode connection and the contact connection, which is carried by a carrier substrate.
- the invention is based on the finding that the external electrodes can be made shorter by a modification of the resistance device, so that the electrode arrangement and thereby also an atomizer equipped therewith can be made more compact, in particular in the direction of the main axis.
- the resistors are installed in the outer electrodes. Frequently, two resistors in series are ge ⁇ switches in each outer electrode. For example, a typical 50 Mohm resistor has a diameter of 8 mm and a length of about 60 mm. Two such resistors in an outer electrode thus increase their length by 120 mm.
- a resistance is in the form of a resistance path, for example, particularly a lot of space can be saved ⁇ who, if the resistance path is perpendicular to the main axis. It is particularly advantageous if the resistance track is printed on the carrier substrate.
- the carrier substrate is made of a ceramic material or a plastic material.
- the resistance unit is arranged between the carrier substrate and a counter substrate such that a laminate structure is formed.
- the carrier substrate is surrounded by the resistor unit of an electrically non-conductive shell.
- the shell is formed from an electrically non-conductive plastic material, in particular a resin material.
- a particularly effective ionization of coating material is achieved if several external electrodes are present.
- each outer electrode When each outer electrode is electrically connected to each of an electrode terminal of a single resistance unit, each outer electrode can be assigned an individual damping resistance. There may be a common connection conductor, via which the contact terminals of all resistance units can be connected to a high voltage source.
- the contact terminals of individual resistance units can each be connected separately to a high-voltage source or the contact terminals of at least two resistance units can be connected to a high-voltage source via a common connection conductor.
- individual external electrodes or groups thereof can be subjected to different high voltage.
- the electrode arrangement is particularly compact when the carrier substrate is plate-shaped and is arranged at an angle different from 0 ° to the main axis.
- the angle is then 90 °.
- the resistance path extends in a plane which is perpendicular to the main axis.
- the main extension of the resistance unit thus goes in the direction perpendicular to the main axis.
- FIG. 1 shows a perspective view of a high-rotation atomizer with an electrode arrangement, wherein the housing of a resistance device partially is shown broken away;
- Figure 2 is a view of a resistor assembly according to a first embodiment of a resistance device according to a first type
- Figure 4 is a view corresponding to Figure 2 on a resistor assembly according to a second embodiment
- FIG. 5 shows a view corresponding to FIGS. 2 and 4 of a resistor assembly according to a third exemplary embodiment
- FIG. 6 shows a section corresponding to FIG. 3 of a modified resistance device according to a second embodiment .
- a total of 10 designates an electrostatically operating high-speed rotary atomizer, which can be coupled via a coupling section 12 to the arm of a multi-axis application robot not specifically shown, as is known per se.
- the high-rotation atomizer 10 comprises a head section 14, in which a bell plate is installed in a known manner, which rotates during the paint application at high speed and over which a paint mist is discharged.
- the Glo ⁇ ckenteller can not see figure 1 itself.
- the high-rotation atomizer 10 operates on the principle of the so-called external charging and for this purpose comprises an electric ⁇ denan Aunt 16 which defines a main axis 18, which coincides in the present embodiment with the axis of rotation of the bell cup. An electric field is built up around the main axis 18.
- the electrode assembly 16 includes a plurality of outer electrodes 20. These are formed in the present embodiment as a rod electrode 22, wherein six such rod electrodes 22 are arranged symmetrically to the main axis 18 around the bell cup around.
- the rod electrodes 22 are connected via an electrical resistance device 24 to a pole of a high voltage source 26, which is indicated only schematically in FIG.
- the other pole of the high voltage source 26 is connected to an object to be coated, which must be electrically conductive and is thus placed at ground potential.
- the rod electrodes 22 work as spray electrodes and ionize the paint particles emitted by the bell cup of the high-speed rotary atomizer 10, which then migrate to the object due to the existing electric field, which is coated thereby.
- the rod electrodes 22 have needle-shaped tips, as it is known per se.
- the resistance device 24 serves as a damping resistor and prevents rapid current changes.
- the resistance device 24 is designed here particularly flat and arranged so that the axial extent of the rod electrodes 22 and thus the axial
- the resistance device 24 has its main extension in a main extension plane 28, which is illustrated in each case in Figures 3 and 6 and is at an angle on the main axis 18 of the electrode assembly 16. When vorlie ⁇ constricting embodiment, this angle is 90 °.
- this includes e.g. in a first embodiment, a planar annular support substrate 30 having a corresponding annular support surface 32 which carries six resistor units 34, so that each rod electrode 22 can cooperate with a resistance unit 34.
- Each resistance unit 34 comprises an electrode terminal 36, to which the resistance unit 34 is connected to a rod electrode 22, and a contact terminal 38, via which the resistance unit 34 can be connected to the high-voltage power source 26.
- This resistance path 40 is printed in the present embodiment on the carrier substrate 30 and has a meandering course.
- the size of the resistor depends on the length of the resistance path 40, so that the size of the resistor can be adjusted by a correspondingly twisted course, wherein the area of the support surface 32 of the carrier substrate 30 required for the resistance unit 34 does not change.
- the actual course of a respective resistance track 40 may thus be different, and also differ in two resistor units 34 of the same abutment ⁇ stand device 24th
- the carrier substrate 30 made of a ceramic material or a plastic material is.
- the resistor units 34 are connected to a resistor assembly 42.
- a common connecting conductor 44 is present, which connects the contact terminals 38 of all resistor units 34 with each other, so that via the connecting conductor 44, the contact terminals of all resistance units can be connected to the high voltage source 26.
- a counter substrate 46 which is adapted in shape and dimension to the carrier substrate 30 and is likewise designed as a planar ring.
- the resistor units 34 are arranged between the carrier substrate 30 and the counter substrate 46 such that a laminate structure 48 is formed.
- This laminate structure 48 is surrounded by an electrically non-conductive shell 50, which may be formed for example from an electrically non-conductive plastic material such as ei ⁇ nem resin material.
- an electrically non-conductive shell 50 which may be formed for example from an electrically non-conductive plastic material such as ei ⁇ nem resin material.
- the counter substrate 46 and the shell 50 are not shown in Figures 1, 2, 4 and 5 for clarity.
- the resistance device 24 comprises a contact connection channel 52, which leads from the outside through the sheath 50 and the carrier substrate 30 to the connection conductor 44, so that it is accessible from the outside and can be connected to the high-voltage source 26.
- the resistance device 24 comprises for each electrode terminal 36 of the resistance units 34 an electrode connection channel 54, one of which can be seen in FIG.
- These electrode connection channels 54 each lead from the outside through the casing 50 and the counter substrate 46 to an associated electrode connection 36 of a resistance unit 34.
- the resistance device 24 is housed in a ring housing 56 and arranged on the side remote from the rod electrodes 22 side of the head portion 14 of the high-rotation atomizer 10 and surrounds the there existing components inside.
- FIG. 4 shows a modified resistance module 42 'as a second exemplary embodiment.
- There two contact terminals 38 of two adjacently arranged Wi ⁇ resistance units 34 are each connected to each other via a respective common connection conductor 58, so that in each case two resistance units can be connected as a group with the high voltage source 26.
- the stick electrodes 22 can always be supplied as a pair with high voltage.
- the resistance device 24 thus formed, there are correspondingly three contact connection channels, via which the connection conductors 58 are accessible from the outside, but which can not be seen in FIG.
- a further modified resistor assembly 42 '' is shown as a third embodiment.
- the contact terminals 38 of the resistor units 34 may each be separately connected to the high voltage source 26.
- the resistance device 24 thus formed there are correspondingly six contact connection channels via which the contact connections 38 are accessible directly from the outside, but which can not be seen in FIG.
- each rod electrode 22 can be supplied separately with high voltage.
- FIG. 6 shows a resistance device 24 of a second type.
- the carrier substrate 30 and the Gegensub ⁇ strate 46 are not formed as a flat rings, but as a truncated cone, which are arranged coaxially to each other and record the resistance units 34 between them.
- the resistance device 24 according to FIG. 6 illustrates that other designs using resistance paths 40 are also suitable for keeping the extent of the outer electrodes 20 in the direction of the main axis 18 smaller than was hitherto possible.
- the resistance device 42 can also be designed as an exchange module.
- a set is provided with a plurality of resistance means 42 whose resistance units 34 offer different resistances whose size depends on the length of the respective resistance path 40.
- the resistance device 24 is designed to be adjustable so that its effective resistance or the resistance of individual resistance units 34 can be changed.
- the resistance path 40 of a resistance unit 34 can be connected to the electrode terminal 36 at different locations, so that the effective length of the resistance path 40 between the contact terminal 38 and the
- Electrode connection 36 can be adjusted.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011121915A DE102011121915A1 (de) | 2011-12-22 | 2011-12-22 | Elektrodenanordnung und elektrostatischer Zerstäuber mit einer solchen |
PCT/EP2012/005116 WO2013091794A1 (de) | 2011-12-22 | 2012-12-12 | Elektrodenanordnung und elektrostatischer zerstäuber mit einer solchen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2794116A1 true EP2794116A1 (de) | 2014-10-29 |
EP2794116B1 EP2794116B1 (de) | 2018-05-09 |
Family
ID=47501058
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12809599.9A Active EP2794116B1 (de) | 2011-12-22 | 2012-12-12 | Elektrodenanordnung und elektrostatischer zerstäuber mit einer solchen |
Country Status (4)
Country | Link |
---|---|
US (1) | US20140306035A1 (de) |
EP (1) | EP2794116B1 (de) |
DE (1) | DE102011121915A1 (de) |
WO (1) | WO2013091794A1 (de) |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3803708A (en) * | 1973-02-16 | 1974-04-16 | Matsushita Electric Ind Co Ltd | Method for making a resistor |
DE3021288A1 (de) * | 1980-06-06 | 1981-12-24 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Abgleichbarer schichtwiderstand, insbesondere fuer hochspannungsanwendung |
DE3429075A1 (de) | 1984-08-07 | 1986-02-20 | Hermann Behr & Sohn Gmbh & Co, 7121 Ingersheim | Vorrichtung zum elektrostatischen beschichten von gegenstaenden |
US4887770A (en) * | 1986-04-18 | 1989-12-19 | Nordson Corporation | Electrostatic rotary atomizing liquid spray coating apparatus |
DE4027078A1 (de) * | 1990-08-27 | 1992-03-05 | Wagner Int | Elektrostatische spruehpistole |
JP2830683B2 (ja) * | 1992-09-11 | 1998-12-02 | トヨタ自動車株式会社 | 回転霧化静電塗装装置 |
DE19611369A1 (de) | 1996-03-22 | 1997-09-25 | Duerr Gmbh & Co | Rotationszerstäuber zum elektrostatisch unterstützten Beschichten von Gegenständen mit Farben bzw. Lacken |
US5947377A (en) * | 1997-07-11 | 1999-09-07 | Nordson Corporation | Electrostatic rotary atomizing spray device with improved atomizer cup |
EP0967018B1 (de) * | 1998-01-13 | 2004-11-17 | Abb K.K. | Beschichtungsvorrichtung mit einem drehenden sprühkopf |
DE10202711A1 (de) * | 2002-01-24 | 2003-07-31 | Duerr Systems Gmbh | Zerstäuber für die elektrostatische Serienbeschichtung von Werkstücken |
WO2004085078A1 (ja) * | 2003-03-27 | 2004-10-07 | Asahi Sunac Corporation | 静電塗装用スプレーガン |
JP4578908B2 (ja) * | 2004-09-17 | 2010-11-10 | トヨタ自動車株式会社 | 静電塗装装置 |
JP4445830B2 (ja) * | 2004-10-14 | 2010-04-07 | ランズバーグ・インダストリー株式会社 | 静電式散布装置 |
JP4456147B2 (ja) * | 2007-11-02 | 2010-04-28 | トヨタ自動車株式会社 | 静電塗装装置 |
DE102009013979A1 (de) * | 2009-03-19 | 2010-09-23 | Dürr Systems GmbH | Elektrodenanordnung für einen elektrostatischen Zerstäuber |
JP5513061B2 (ja) * | 2009-10-09 | 2014-06-04 | 旭サナック株式会社 | 静電塗装システム、および、静電塗装用スプレーガン |
-
2011
- 2011-12-22 DE DE102011121915A patent/DE102011121915A1/de not_active Withdrawn
-
2012
- 2012-12-12 US US14/363,926 patent/US20140306035A1/en not_active Abandoned
- 2012-12-12 WO PCT/EP2012/005116 patent/WO2013091794A1/de active Application Filing
- 2012-12-12 EP EP12809599.9A patent/EP2794116B1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2013091794A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2013091794A1 (de) | 2013-06-27 |
DE102011121915A1 (de) | 2013-06-27 |
US20140306035A1 (en) | 2014-10-16 |
EP2794116B1 (de) | 2018-05-09 |
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