EP2299788A2 - Device for draining electrostatic charges - Google Patents
Device for draining electrostatic charges Download PDFInfo
- Publication number
- EP2299788A2 EP2299788A2 EP10009702A EP10009702A EP2299788A2 EP 2299788 A2 EP2299788 A2 EP 2299788A2 EP 10009702 A EP10009702 A EP 10009702A EP 10009702 A EP10009702 A EP 10009702A EP 2299788 A2 EP2299788 A2 EP 2299788A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- electrostatic charges
- ventilation
- charge
- workpiece
- 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
- 239000006096 absorbing agent Substances 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000009423 ventilation Methods 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 20
- 239000002800 charge carrier Substances 0.000 claims description 17
- 238000012546 transfer Methods 0.000 claims description 9
- 239000003973 paint Substances 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 230000001939 inductive effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000009413 insulation Methods 0.000 abstract 1
- 238000009795 derivation Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000007591 painting process Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000007786 electrostatic charging Methods 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000005421 electrostatic potential Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 238000000752 ionisation method Methods 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/06—Carrying-off electrostatic charges by means of ionising radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/60—Ventilation arrangements specially adapted therefor
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T23/00—Apparatus for generating ions to be introduced into non-enclosed gases, e.g. into the atmosphere
Definitions
- the invention relates to a device for discharging electrostatic charges according to the preamble of patent claim 1.
- a potential difference is generated between the workpiece and the paint or a coating powder, which improves the homogeneous application of paint on the workpiece surface due to electrostatic forces.
- the electrostatic charges on the workpiece are removed after the painting in various ways.
- Electrostatic charges also play a role in other technical fields. For example, electrostatic charging may occur during the processing of plastic due to friction effects. Other processing steps can also occur on a wide variety of materials, which produce an electrostatic potential difference which must be eliminated.
- the DE 695 02 463 T2 shows a device for dissipating electrostatic charges from a body, wherein the electrostatic charges absorbed by the body are first conducted in a capacitance and possibly stored, and continue to be discharged via grounding connection conductors arranged thereon in the earth as a potential well.
- a disadvantage of the cited prior art is that always a good ground connection must be provided, which receives the charges occurring, and prevents overall charging of the system.
- the electrostatic charges are not dissipated sufficiently quickly and effectively via the ground connection conductor, allowing them to accumulate on the workpiece and / or in the capacitor.
- the invention has the object to provide a device for dissipating electrostatic charges in such a way that the derivation of the electrostatic charges is flexible, simple, inexpensive and effective executable.
- the invention is based on a device for dissipating electrostatic charges from a workpiece, for example in a paint-spraying installation.
- it comprises an absorber for removing and discharging the electrostatic charges from the workpiece, wherein a connecting device for transmitting the electrostatic charges is provided between the workpiece and the absorber.
- the absorber comprises an air ionization device.
- the discharge of the charges via an air-ionization device is furthermore independent of the origin of the charges, so that both electrostatically influenced painting or coating processes, as well as processing operations with electrostatic charge can be supplied by the discharge device.
- the connecting device comprises capacitive and / or inductive components.
- the electrostatic charges can be absorbed by the workpiece and cached.
- the air-ionization device is arranged in at least one ventilation duct with an inlet and outlet opening.
- At least one ventilation device for generating an air flow is arranged in the ventilation duct.
- the ventilation device improves the air circulation in the ventilation duct and thus the charge transfer of the electrostatic charges from the charge carrier into the air.
- At least one of the ventilation device upstream and / or downstream posstechniksssprühvorraum is arranged for spraying a liquid into the air, preferably in the air flow direction in the ventilation duct.
- a liquid sprayed into the air stream via the liquid spray device influences the possibility of charge transfer of the electrostatic charges to the air. Furthermore, it is also possible to achieve a regenerative or process-optimizing effect on the absorber device, for example in the form of a reduction in wear or an improvement in the charge-delivery capability.
- the liquid is an ionizing or ionizing liquid which enhances air ionization.
- An ionizing or ionizing liquid such as ammonia, magnesium chloride, manganese, ammonium and their compounds, carbon dioxide, alcohols, distilled water or various solvents, improves the ionization process of the air in the air flow of the ventilation duct.
- a highly volatile substance such as solvents, evaporates quickly and almost without residue due to any existing high alcohol levels, etc.
- Various surfactants are also outstandingly suitable as ionization enhancers for the air.
- Such a liquid can atomize very finely in the manner of an aerosol, taking up charge carriers and thus contributing to increased efficiency in the air-ionization device. All those liquids are conceivable which provide additional charge carriers to the air, and thus can improve the potential well.
- charge carriers for a charge transfer of the electrostatic charges are arranged in the air flow in the ventilation duct.
- the charge carriers preferably have a large surface in order to carry out the charge transfer of the electrostatic charge quantities in the shortest possible time.
- the surface charge density plays a significant role on the charge-releasing charge carriers.
- a further preferred embodiment of the invention provides that the charge carriers in the ventilation channel plate-shaped, rod-shaped, mesh or lattice-shaped or can be formed as a tip.
- the surface of the charge carriers can be adapted to the charge transfer to be achieved.
- the well-known physical effects of the peak discharge, surface charge densities and the charge Nachhnees can be used optimally on conductive surfaces.
- a further preferred embodiment of the invention provides that the liquid spray device and the ventilation device are monitored, controlled and regulated by means of a control unit.
- the monitoring, control and regulation of the air and the ionizing liquid amount allows an adaptation of process parameters to the dissipated electrostatic charge amount. This can be done as unilaterally predetermined setting of control parameters, or be designed as a parameter-detecting control.
- the absorber is designed as a mobile unit.
- the mobile unit allows deployment in different locations, the device parameters being designed to cover a wide range of applications for dissipating electrostatic charges.
- the device according to the invention is not to be understood as limiting the discharge of electrostatic charges of workpieces or vehicles in a paint shop.
- Other applications which have a need for a derivation according to the invention of electrostatic charges during a process are also encompassed by the idea of the invention.
- the invention provides a device for measuring the derived, electrostatic charges.
- This further aspect of the invention is that the device measures the discharged charges in the exhaust air of the air ionization device and / or in the connection device and thus can provide information about it.
- This has the advantage that the measured values can be used to control the air-ionization device, whereby the Control to dissipate electrostatic charges is improved.
- environmental influences which can be caused by the discharge of charge carrier-enriched exhaust air, could be estimated.
- the current flow or the voltage for determining control parameters in the connecting line between the workpiece and the absorber is measured in order to carry out a control of the air-ionizing device.
- Such a measurement can be made anywhere on the device.
- FIG. 1 a block diagram of a device 1 is shown, which is provided for the discharge of electrostatic charges.
- the device 1 comprises an absorber 2 for receiving and discharging electrostatic charges of a workpiece 10.
- the capacitor 3 can be arranged in a parallel or series connection between the workpiece 10 and the absorber 2.
- the connecting device can be formed additionally or alternatively as a line which has a very good conductivity for an effective charge transfer.
- the workpiece 10 is charged with electrical charges during a machining operation.
- the workpiece is connected via a charge line 11 to capacitors 3, which are designed to receive and store the discharged electrostatic charges.
- the capacitances 3 can absorb considerably more charges per unit of time in their capacitive dimension than are usually supplied to the workpiece via the machining process. In this way a continuous charge removal is ensured.
- the absorber 2 comprises an air-ionization device 12, in which a flowing air stream is enriched with charges.
- a ventilation duct 4 is supplied with supply air 5, preferably from outside a closed working space.
- the ventilation duct 4 has in its interior at least one ventilation device 8, which forms an improved and continuous air circulation of the air flow.
- charge carriers 7 are arranged which are connected to the capacitive 3 conductively. Such charge carriers 7 are presently shown as ribbed or plates in order to provide the largest possible effective area for the delivery of surface charges.
- a liquid spraying device 9 arranged in the air flow of the ventilation duct 4 sprays an ionizing liquid into the air stream, which improves the charge transfer from the charge carriers 7 into the ionized air.
- the electrostatic charges are conducted by means of the ionized air and the charge carriers contained therein via the exhaust air 6 of the ventilation duct 4 to the outside. In principle, further downstream filter devices would also be conceivable.
- the liquid spraying device 9 is supplied with ionizing liquid from an arranged reservoir 14 continuously or discontinuously by means of a conveying unit 13.
- the air ionization device is connected to a controller which allows monitoring and control of the ventilation device 8 and the liquid spray device 9 in dependence on the discharged electrostatic charges from the capacitors 3.
- a measuring device for measuring the discharged electrostatic charges is arranged (not shown here), which cooperates optimally with the control of the air-ionization device for controlling the discharge of electrostatic charges.
- the measurement of electrostatic charges can also take place in the connection device 3 of the device 1.
- a plurality of air ionization channels can also be present next to each other in cascade, as in FIG Fig. 1 shown. These can be connected as needed, be provided as expansion options, or provide a uniform distribution of the load of the charge delivery.
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur Ableitung von elektrostatischen Ladungen nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for discharging electrostatic charges according to the preamble of
Die Ableitung elektrostatischer Ladungen von Werkstücken stellt in der heutigen Herstellung von Erzeugnissen einen großen Stellenwert dar.The derivation of electrostatic charges from workpieces is a major concern in today's manufacturing of products.
Beispielsweise ist es in einer Lackieranlage für Werkstücke oder Fahrzeuge üblich, elektrostatisch aufgeladene Farbpartikel zu nutzen, um einen verbesserten Auftragswirkungsgrad und eine bessere Verteilung der Farbpartikel zu erreichen. Eine notwendige Maßnahme dabei ist allerdings, die elektrostatischen Ladungen vom Werkstück oder Fahrzeug während und nach dem Lackiervorgang abzuleiten, da der Aufbau elektrostatischer Felder Einfluss auf den stattfindenden Lackiervorgang oder die spätere Handhabung haben kann.For example, in a paint shop for workpieces or vehicles, it is common to use electrostatically charged paint particles to achieve improved application efficiency and better distribution of the paint particles. A necessary measure here, however, is to derive the electrostatic charges from the workpiece or vehicle during and after the painting process, since the structure of electrostatic fields can influence the ongoing painting or the subsequent handling.
Für den Lackiervorgang wird zwischen dem werkstück und der Farbe bzw. einem Beschichtungspulver ein Potentialunterschied erzeugt, der den homogenen Farbauftrag auf der Werkstückoberfläche aufgrund elektrostatischer Kräfte verbessert. Die elektrostatischen Ladungen am Werkstück werden nach dem Lackiervorgang auf unterschiedlichste Art und Weise abgeführt.For the painting process, a potential difference is generated between the workpiece and the paint or a coating powder, which improves the homogeneous application of paint on the workpiece surface due to electrostatic forces. The electrostatic charges on the workpiece are removed after the painting in various ways.
Elektrostatische Aufladungen spielen auch in anderen technischen Gebieten eine Rolle. So kann beispielsweise bei der Bearbeitung von Kunststoff aufgrund von Reibungseffekten eine elektrostatische Aufladung erfolgen. Es können auch andere Bearbeitungsschritte an verschiedensten Materialien auftreten, welche eine elektrostatische Potentialdifferenz erzeugen, die es zu beseitigen gilt.Electrostatic charges also play a role in other technical fields. For example, electrostatic charging may occur during the processing of plastic due to friction effects. Other processing steps can also occur on a wide variety of materials, which produce an electrostatic potential difference which must be eliminated.
Vorrichtungen zur Ableitung von elektrostatischen Ladungen sind in einer Vielzahl unterschiedlicher Ausführungsformen bekannt geworden.Devices for dissipation of electrostatic charges have become known in a variety of different embodiments.
Die
Eine wichtige Anforderung an derartige Vorrichtungen ist das Ableiten auftretender Mengen elektrostatischer Ladungen entweder in kurzer Zeit oder als kontinuierliche, im Wesentlichen dem Ladungsauftrag entsprechende Entladung.An important requirement of such devices is the derivation of occurring amounts of electrostatic charges either in a short time or as a continuous, substantially corresponding to the charge order discharge.
Nachteilig am genannten Stand der Technik ist, dass stets eine gute Erdverbindung bereitgestellt werden muss, welche die auftretenden Ladungen aufnimmt, und eine Gesamtaufladung des Systems verhindert.A disadvantage of the cited prior art is that always a good ground connection must be provided, which receives the charges occurring, and prevents overall charging of the system.
Weiterhin werden die elektrostatischen Ladungen über den Erdverbindungsleiter nicht ausreichend schnell und effektiv abgeleitet, wodurch sich diese auf dem Werkstück und/oder in der Kapazität ansammeln können.Furthermore, the electrostatic charges are not dissipated sufficiently quickly and effectively via the ground connection conductor, allowing them to accumulate on the workpiece and / or in the capacitor.
Aus diesem Grunde hat sich die Erfindung die Aufgabe gestellt eine Vorrichtung zur Ableitung elektrostatischer Ladungen derart weiter zu bilden, dass die Ableitung der elektrostatischen Ladungen flexibel, einfach, kostengünstig und effektiv ausführbar ist.For this reason, the invention has the object to provide a device for dissipating electrostatic charges in such a way that the derivation of the electrostatic charges is flexible, simple, inexpensive and effective executable.
Zur Lösung der Aufgabe ist Erfindung durch die Merkmale des Patentanspruches 1 gekennzeichnet.To achieve the object invention is characterized by the features of
Vorteilhafte Erweiterungen der Erfindung sind in den abhängigen Ansprüchen beschrieben.Advantageous extensions of the invention are described in the dependent claims.
Die Erfindung geht von einer Vorrichtung zur Ableitung von elektrostatischen Ladungen von einem Werkstück, beispielsweise in einer Farblackieranlage aus. Sie umfasst dabei einen Absorber zur Entnahme und Ableitung der elektrostatischen Ladungen von dem Werkstück, wobei zwischen Werkstück und Absorber eine Verbindungseinrichtung zur Übertragung der elektrostatischen Ladungen vorgesehen ist.The invention is based on a device for dissipating electrostatic charges from a workpiece, for example in a paint-spraying installation. In this case, it comprises an absorber for removing and discharging the electrostatic charges from the workpiece, wherein a connecting device for transmitting the electrostatic charges is provided between the workpiece and the absorber.
Der Kern der Erfindung liegt darin, dass der Absorber eine Luft-Ionisations-Vorrichtung umfasst.The essence of the invention is that the absorber comprises an air ionization device.
Durch eine Luftionisation können an beliebigen Orten größere Mengen elektrostatischer Ladungen von einem Werkstück über die Luft abgeführt werden.By air ionization larger amounts of electrostatic charges can be removed from a workpiece through the air at any location.
Die Ableitung der elektrostatischen Ladungen über ionisierte Luft bzw. Luftbestandteile ist aufgrund des zur Verfügung stehenden Volumens der Luft in nahezu unbegrenzter Menge durchführbar. Größere Ladungsmengen werden entsprechend ihres Ionisationspotentials ggf. schneller an die Luft abgegeben.The derivation of the electrostatic charges via ionized air or air components is feasible in almost unlimited amount due to the available volume of air. Larger amounts of charge may be released into the air faster, depending on their ionization potential.
Die Abführung der Ladungen über eine Luft-Ionisations-Vorrichtung ist des Weiteren unabhängig von der Herkunft der Ladungen, so dass sowohl elektrostatisch beeinflusste Lackieroder Beschichtungsvorgänge, als auch Bearbeitungsvorgänge mit elektrostatischer Aufladung durch die Entladungsvorrichtung versorgt werden können.The discharge of the charges via an air-ionization device is furthermore independent of the origin of the charges, so that both electrostatically influenced painting or coating processes, as well as processing operations with electrostatic charge can be supplied by the discharge device.
In einer bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass die Verbindungseinrichtung kapazitive und/oder induktive Bestandteile umfasst. Durch eine Anordnung von beispielsweise Kapazitäten zwischen dem Werkstück und dem Absorber können die elektrostatischen Ladungen von dem Werkstück aufgenommen und zwischengespeichert werden.In a preferred embodiment of the invention, it is provided that the connecting device comprises capacitive and / or inductive components. By an arrangement of, for example, capacities between the workpiece and the Absorber, the electrostatic charges can be absorbed by the workpiece and cached.
In einer überdies bevorzugten Ausgestaltung der Erfindurg ist vorgesehen, dass die Luft-Ionisations-Vorrichtung in mindestens einem Lüftungskanal mit einer Zu- und Abluftöffnung angeordnet ist.In a further preferred embodiment of the invention it is provided that the air-ionization device is arranged in at least one ventilation duct with an inlet and outlet opening.
Dies verbessert den Ladungstransfer elektrostatischer Ladungen von einem Ladungsträger in die Luft, da ein kontinuierlicher Zustrom an Frischluft (ohne Ionisation) gewährleistet werden kann. In den Luftkanal wird Frischluft zugeführt, welche vorzugsweise nicht aus dem Innenraum einer Farblackier- oder Bearbeitungsanlage entnommen ist.This improves the charge transfer of electrostatic charges from a charge carrier into the air, since a continuous influx of fresh air (without ionization) can be ensured. In the air duct fresh air is supplied, which is preferably not removed from the interior of a Farblackier- or processing plant.
Es ist in einer überdies bevorzugten Ausgestaltung der Erfindung vorgesehen, dass in dem Lüftungskanal mindestens eine Ventilationsvorrichtung zur Erzeugung eines Luftstroms angeordnet ist. Die Ventilationsvorrichtung verbessert die Luftzirkulation im Lüftungskanal und somit den Ladungstransfer der elektrostatischen Ladungen von dem Ladungsträger in die Luft.It is provided in a further preferred embodiment of the invention that at least one ventilation device for generating an air flow is arranged in the ventilation duct. The ventilation device improves the air circulation in the ventilation duct and thus the charge transfer of the electrostatic charges from the charge carrier into the air.
Überdies ist es in einer weiteren Ausgestaltung der Erfindung vorgesehen, dass in Lüftungskanal mindestens eine der Ventilationsvorrichtung vor- und/oder nachgeschaltete Flüssigkeitssprühvorrichtung zum Versprühen einer Flüssigkeit in die Luft, vorzugsweise in Luftstromrichtung angeordnet ist.Moreover, it is provided in a further embodiment of the invention that at least one of the ventilation device upstream and / or downstream Flüssigkeitsssprühvorrichtung is arranged for spraying a liquid into the air, preferably in the air flow direction in the ventilation duct.
Eine über die Flüssigkeitssprühvorrichtung in den Luftstrom eingesprühte Flüssigkeit beeinflusst zusätzlich die Möglichkeit des Ladungstransfers der elektrostatischen Ladungen an die Luft. Weiterhin kann auch eine regenerative oder ablaufoptimierende Wirkung an der Absorbereinrichtung, beispielsweise in Form von Verschleißminderung oder Verbesserung der Ladungs-Abgabefähigkeit, erreicht werden.In addition, a liquid sprayed into the air stream via the liquid spray device influences the possibility of charge transfer of the electrostatic charges to the air. Furthermore, it is also possible to achieve a regenerative or process-optimizing effect on the absorber device, for example in the form of a reduction in wear or an improvement in the charge-delivery capability.
In einer weiteren bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass die Flüssigkeit eine ionisierende oder ionisierend wirkende Flüssigkeit ist, welche die Luftionisation verstärkt.In a further preferred embodiment of the invention it is provided that the liquid is an ionizing or ionizing liquid which enhances air ionization.
Eine ionisierende oder ionisierend wirkende Flüssigkeit, wie beispielsweise Ammoniak, Magnesiumchlorid, Mangan, Ammonium und deren Verbindungen, Kohlendioxid, Alkohole, destilliertes Wasser oder diverse Lösungsmittel, verbessert den lonisationsvorgang der Luft im Luftstrom des Lüftungskanals. Insbesondere eine stark flüchtige Substanz, wie beispielsweise Lösungsmittel, verdunstet aufgrund eventuell vorhandener hoher Alkoholanteile etc. schnell und nahezu rückstandslos. Auch diverse Tenside eignen sich hervorragend als Ionisationsverstärker für die Luft.An ionizing or ionizing liquid, such as ammonia, magnesium chloride, manganese, ammonium and their compounds, carbon dioxide, alcohols, distilled water or various solvents, improves the ionization process of the air in the air flow of the ventilation duct. In particular, a highly volatile substance, such as solvents, evaporates quickly and almost without residue due to any existing high alcohol levels, etc. Various surfactants are also outstandingly suitable as ionization enhancers for the air.
Eine derartige Flüssigkeit kann sehr fein zerstäubt in der Art eines Aerosols verbessert Ladungsträger aufnehmen und somit in der Luft-Ionisations-Vorrichtung zu einem erhöhten Wirkungsgrad beitragen. Es sind dabei all diejenigen Flüssigkeiten denkbar, welche der Luft zusätzliche Ladungsträger bereitstellen, und somit die Potentialsenke verbessern können.Such a liquid can atomize very finely in the manner of an aerosol, taking up charge carriers and thus contributing to increased efficiency in the air-ionization device. All those liquids are conceivable which provide additional charge carriers to the air, and thus can improve the potential well.
Überdies ist es in einer weiteren Ausgestaltung der Erfindung bevorzugt, dass im Lüftungskanal Ladungsträger für einen Ladungstransfer der elektrostatischen Ladungen in den Luftstrom angeordnet sind. Die Ladungsträger weisen vorzugsweise eine große Oberfläche auf, um den Ladungstransfer der elektrostatischen Ladungsmengen innerhalb kürzester Zeit durchzuführen. Hierbei spielt die Oberflächenladungsdichte auf den Ladungen abgebenden Ladungsträgern eine nicht unerhebliche Rolle.Moreover, in a further embodiment of the invention it is preferred that charge carriers for a charge transfer of the electrostatic charges are arranged in the air flow in the ventilation duct. The charge carriers preferably have a large surface in order to carry out the charge transfer of the electrostatic charge quantities in the shortest possible time. Here, the surface charge density plays a significant role on the charge-releasing charge carriers.
Eine weitere bevorzugte Ausgestaltung der Erfindung sieht vor, dass die Ladungsträger im Lüftungskanal plattenförmig, stangenförmig, netz- oder gitterförmig oder als Spitzen ausbildbar sind. Je nach abzuleitender Ladungsmenge und zur Verfügung stehender Geometrie kann die Oberfläche der Ladungsträger an den zu erreichenden Ladungstransfer angepasst werden. Dabei sind verschiedene Oberflächenformen und deren Kombination miteinander möglich, wobei die wohl bekannten physikalischen Effekte der Spitzenentladung, Flächenladungsdichten und des Ladungsnachflusses an leitenden Oberflächen optimierend eingesetzt werden können.A further preferred embodiment of the invention provides that the charge carriers in the ventilation channel plate-shaped, rod-shaped, mesh or lattice-shaped or can be formed as a tip. Depending on the amount of charge to be deduced and the available geometry, the surface of the charge carriers can be adapted to the charge transfer to be achieved. Here are different surface shapes and their Combination with each other possible, whereby the well-known physical effects of the peak discharge, surface charge densities and the charge Nachflusses can be used optimally on conductive surfaces.
Eine überdies bevorzugte Ausgestaltung der Erfindung sieht vor, dass die Flüssigkeitssprühvorrichtung und die Ventilationsvorrichtung mittels einer Steuereinheit überwacht, gesteuert und geregelt werden. Die Überwachung, Steuerung und Regelung der Luft- und der ionisierenden Flüssigkeitsmenge ermöglicht eine Anpassung von Verfahrensparameter an die abzuführende elektrostatische Ladungsmenge. Dies kann als einseitig vorgegebene Einstellung von Regelungsparametern erfolgen, oder als Parameter erfassende Steuerung ausgebildet sein.A further preferred embodiment of the invention provides that the liquid spray device and the ventilation device are monitored, controlled and regulated by means of a control unit. The monitoring, control and regulation of the air and the ionizing liquid amount allows an adaptation of process parameters to the dissipated electrostatic charge amount. This can be done as unilaterally predetermined setting of control parameters, or be designed as a parameter-detecting control.
Überdies ist in einer weiteren Ausgestaltung der Erfindung vorgesehen, dass der Absorber als mobile Einheit ausgebildet ist. Die mobile Einheit ermöglicht einen Einsatz an unterschiedlichen Orten, wobei die Vorrichtungsparametar dazu ausgelegt sind, einen großen Bereich von Anwendungen zur Ableitung elektrostatischer Ladungen abzudecken.Moreover, it is provided in a further embodiment of the invention that the absorber is designed as a mobile unit. The mobile unit allows deployment in different locations, the device parameters being designed to cover a wide range of applications for dissipating electrostatic charges.
Die erfindungsgemäße Vorrichtung ist nicht einschränkend auf die Ableitung elektrostatischer Ladungen von Werkstücken oder Fahrzeugen in einer Lackieranlage zu verstehen. Auch weitere Anwendungen, welche Bedarf an einer erfindungsgemäßen Ableitung elektrostatischer Ladungen während eines Prozesses haben, sind vom Erfindungsgedanken umfasst.The device according to the invention is not to be understood as limiting the discharge of electrostatic charges of workpieces or vehicles in a paint shop. Other applications which have a need for a derivation according to the invention of electrostatic charges during a process are also encompassed by the idea of the invention.
In einem weiteren Aspekt sieht die Erfindung eine Einrichtung zur Messung der abgeleiteten, elektrostatischen Ladungen vor.In a further aspect, the invention provides a device for measuring the derived, electrostatic charges.
Dieser weitere Aspekt der Erfindung liegt darin, dass die Einrichtung die abgegebenen Ladungen in der Abluft der Luftlonisations-Vorrichtung und/oder in der Verbindungseinrichtung misst und somit Informationen darüber zur Verfügung stellen kann. Dies hat den Vorteil, dass die Messwerte zur Steuerung der Luft-Ionisationsvorrichtung verwendbar sind, wodurch die Steuerung zur Ableitung elektrostatischer Ladungen verbessert wird. Außerdem wären Umwelteinflüsse, welche durch die Abgabe von mit Ladungsträgern angereicherter Abluft verursacht werden können, abschätzbar.This further aspect of the invention is that the device measures the discharged charges in the exhaust air of the air ionization device and / or in the connection device and thus can provide information about it. This has the advantage that the measured values can be used to control the air-ionization device, whereby the Control to dissipate electrostatic charges is improved. In addition, environmental influences, which can be caused by the discharge of charge carrier-enriched exhaust air, could be estimated.
Darüber hinaus ist es denkbar, dass beispielsweise der Stromfluss oder die Spannung zur Bestimmung von Regelparametern in der Verbindungsleitung zwischen dem Werkstück und dem Absorber gemessen wird, um eine Steuerung der Luft-Ionisierungsvorrichtung vorzunehmen. Eine derartige Messung kann an einer beliebigen Stelle der Vorrichtung erfolgen.In addition, it is conceivable that, for example, the current flow or the voltage for determining control parameters in the connecting line between the workpiece and the absorber is measured in order to carry out a control of the air-ionizing device. Such a measurement can be made anywhere on the device.
Weitere Merkmale der Erfindung gehen aus der nachfolgendenFurther features of the invention will become apparent from the following
Figurenbeschreibung und der Zeichnung hervor.Description of the figures and the drawing.
Dabei zeigt:
Figur 1- ein schematisches Blockschaltbild einer Vorrichtung zur Ableitung elektrostatischer Ladungen.
- FIG. 1
- a schematic block diagram of an apparatus for dissipation of electrostatic charges.
In
Die Vorrichtung 1 umfasst einen Absorber 2 zur Aufnahme und Ableitung von elektrostatischen Ladungen eines Werkstückes 10.The
Im dargestellten Ausführungsbeispiel sind mögliche kapazitive Bestandteile 3 der Verbindungseinrichtungen vorgesehen. Die Kapazität 3 kann in einer Parallel- oder Reihenschaltung zwischen dem Werkstück 10 und dem Absorber 2 angeordnet werden. Darüber hinaus ist die Verbindungseinrichtung ergänzend oder alternativ als Leitung ausbildbar, die für einen effektiven Ladungstransfer eine sehr gute Leitfähigkeit aufweist.In the illustrated embodiment, possible capacitive components 3 of the connecting devices are provided. The capacitor 3 can be arranged in a parallel or series connection between the workpiece 10 and the
Das Werkstück 10 wird während eines Bearbeitungsvorganges mit elektrischen Ladungen aufgeladen. Das Werkstück ist über eine Ladungsleitung 11 an Kapazitäten 3 angeschlossen, welche zur Aufnahme und Speicherung der abgeführten elektrostatischen Ladungen ausgebildet sind. Die Kapazitäten 3 können in ihrer kapazitiven Dimension erheblich mehr Ladungen pro Zeiteinheit aufnehmen, als über den Bearbeitungsvorgang dem Werkstück üblicherweise zugeführt werden. Auf diese Weise ist ein kontinuierlicher Ladungsabtransport gesichert.The
Der Absorber 2 umfasst eine Luft-Ionisations-Vorrichtung 12, in welcher ein durchströmender Luftstrom mit Ladungen angereichert wird.The
Für eine Luftionisation wird einem Lüftungskanal 4 Zuluft 5, vorzugsweise von außerhalb eines geschlossenen Arbeitsraums zugeführt. Der Iüftungskanal 4 weist in seinem Innenraum mindestens eine Ventilationsvorrichtung 8 auf, welche eine verbesserte und kontinuierliche Luftzirkulation des Luftstromes ausbildet. In dem Lüftungskanal sind Ladungsträger 7 angeordnet die mit den Kapazitäten 3 leitend verbunden sind. Derartige Ladungsträger 7 sind vorliegend als Rippen- bzw. Platten dargestellt, um eine möglichst große Wirkfläche zur Abgabe von Oberflächenladungen bereit zu stellen.For air ionization, a ventilation duct 4 is supplied with supply air 5, preferably from outside a closed working space. The ventilation duct 4 has in its interior at least one ventilation device 8, which forms an improved and continuous air circulation of the air flow. In the ventilation
Eine im Luftstrom des Lüftungskanals 4 angeordnet Flüssigkeitssprühvorrichtung 9 sprüht eine ionisierende Flüssigkeit in den Luftstrom, die den Ladungstransfer von den Ladungsträgern 7 in die ionisierte Luft verbessert. Die elektrostatischen Ladungen werden mittels der ionisierten Luft und den darin enthaltenen Ladungsträgern über die Abluft 6 des Lüftungskanals 4 ins Freie geführt. Grundsätzlich wären weitere nachgeschaltete Filtervorrichtungen ebenfalls denkbar.A liquid spraying device 9 arranged in the air flow of the ventilation duct 4 sprays an ionizing liquid into the air stream, which improves the charge transfer from the
Die Flüssigkeitssprühvorrichtung 9 wird mittels einer Fördereinheit 13 kontinuierlich oder diskontinuierlich mit ionisierender Flüssigkeit aus einem angeordneten Vorratsbehälter 14 versorgt.The liquid spraying device 9 is supplied with ionizing liquid from an arranged reservoir 14 continuously or discontinuously by means of a conveying
Die Luft-Ionisations-Vorrichtung ist mit einer Steuerung verbunden, die eine Überwachung und Steuerung der Ventilationsvorrichtung 8 und der Flüssigkeitssprühvorrichtung 9 in Abhängigkeit der abzuführenden elektrostatischen Ladungen aus den Kapazitäten 3 ermöglicht.The air ionization device is connected to a controller which allows monitoring and control of the ventilation device 8 and the liquid spray device 9 in dependence on the discharged electrostatic charges from the capacitors 3.
Es ist weiterhin vorgesehen, dass im Lüftungskanal 4 eine Messvorrichtung zur Messung der abgeführten elektrostatischen Ladungen angeordnet ist (hier nicht dargestellt), die mit der Steuerung der Luft-Ionisations-Vorrichtung zur Steuerung der Ableitung elektrostatischer Ladungen optimierend zusammenwirkt. Die Messung von elektrostatischen Ladungen kann ebenfalls in der Verbindungseinrichtung 3 der Vorrichtung 1 erfolgen.It is further provided that in the ventilation duct 4, a measuring device for measuring the discharged electrostatic charges is arranged (not shown here), which cooperates optimally with the control of the air-ionization device for controlling the discharge of electrostatic charges. The measurement of electrostatic charges can also take place in the connection device 3 of the
In einer erfindungsgemäßen Anlage können auch mehrere Luft-Ionisationskanäle kaskadenartig nebeneinander vorliegen, wie in
Der Erfindungsgegenstand der vorliegenden Erfindung ergibt sich nicht nur aus dem Gegenstand der einzelnen Patentansprüche, sondern auch aus der Kombination der einzelnen Patentansprüche untereinander.The subject of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.
Alle in den' Unterlagen, einschließlich der Zusammenfassung offenbarten Angaben und Merkmale, insbesondere die in den Zeichnungen dargestellte räumliche Ausbildung werden als erfindungswesentlich beansprucht, soweit sie einzeln oder in Kombination gegenüber dem Stand der Technik neu sind.All information and features disclosed in the 'documents, including the abstract, in particular the spatial training shown in the drawings are claimed as essential to the invention, as far as they are new individually or in combination with respect to the prior art.
- 1.1.
- Vorrichtungcontraption
- 2.Second
- Absorberabsorber
- 3.Third
- Verbindungseinrichtung mit KapazitätConnecting device with capacity
- 4.4th
- Lüftungskanalventilation duct
- 5.5th
- zuluftto-air
- 6.6th
- Abluftexhaust
- 7.7th
- Ladungsträgercharge carrier
- 8.8th.
- Ventilationsvorrichtungventilation device
- 9.9th
- FlüssigkeitssprühvorrichtungThe liquid spray
- 10.10th
- Werkstückworkpiece
- 11.11th
- Ladungsleitungcharge conduction
- 12.12th
- Luft-Ionisations-VorrichtungAir ionisation device
- 13.13th
- Fördereinheitdelivery unit
- 14.14th
- Vorratsbehälterreservoir
Claims (11)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009042099A DE102009042099A1 (en) | 2009-09-21 | 2009-09-21 | Device for discharging electronic charges |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP2299788A2 true EP2299788A2 (en) | 2011-03-23 |
| EP2299788A3 EP2299788A3 (en) | 2012-10-03 |
| EP2299788B1 EP2299788B1 (en) | 2015-04-01 |
Family
ID=43385594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10009702.1A Active EP2299788B1 (en) | 2009-09-21 | 2010-09-16 | Device for draining electrostatic charges |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2299788B1 (en) |
| DE (1) | DE102009042099A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018104443A1 (en) * | 2018-02-27 | 2019-08-29 | Thomas Mayer | Air conditioning device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69502463T2 (en) | 1994-10-17 | 1998-09-24 | Girolamo Barbieri | Device for removing excessive electrostatic charges from a body |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3711743A (en) * | 1971-04-14 | 1973-01-16 | Research Corp | Method and apparatus for generating ions and controlling electrostatic potentials |
| US4104696A (en) * | 1977-05-27 | 1978-08-01 | Frontier Electronics, Inc. | Grid wire support |
| US4319302A (en) * | 1979-10-01 | 1982-03-09 | Consan Pacific Incorporated | Antistatic equipment employing positive and negative ion sources |
| US4477263A (en) * | 1982-06-28 | 1984-10-16 | Shaver John D | Apparatus and method for neutralizing static electric charges in sensitive manufacturing areas |
| DE3619179A1 (en) * | 1986-06-06 | 1987-12-10 | Haug Gmbh & Co Kg | Method and device for neutralising electrically charged workpieces in a clean room |
| WO1992020201A1 (en) * | 1991-04-25 | 1992-11-12 | Bakhoum Ezzat G | A ground-free static charge removal device |
| JP3142824B2 (en) * | 1998-11-25 | 2001-03-07 | 野村マイクロ・サイエンス株式会社 | Negative ion supply unit and negative ion air generator |
| DE60109308T2 (en) * | 2001-12-11 | 2006-04-13 | Barbieri, Girolamo, Rovellasca | Method and apparatus for neutralizing electrostatic charges on charged parts |
| JP5201958B2 (en) * | 2007-11-22 | 2013-06-05 | 国立大学法人東京工業大学 | Ionizer using piezoelectric transformer electrode and ion generation method for static elimination using the same |
-
2009
- 2009-09-21 DE DE102009042099A patent/DE102009042099A1/en not_active Withdrawn
-
2010
- 2010-09-16 EP EP10009702.1A patent/EP2299788B1/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69502463T2 (en) | 1994-10-17 | 1998-09-24 | Girolamo Barbieri | Device for removing excessive electrostatic charges from a body |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102009042099A1 (en) | 2011-03-24 |
| EP2299788B1 (en) | 2015-04-01 |
| EP2299788A3 (en) | 2012-10-03 |
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