EP0829306B1 - Rotary atomising device - Google Patents
Rotary atomising device Download PDFInfo
- Publication number
- EP0829306B1 EP0829306B1 EP97115490A EP97115490A EP0829306B1 EP 0829306 B1 EP0829306 B1 EP 0829306B1 EP 97115490 A EP97115490 A EP 97115490A EP 97115490 A EP97115490 A EP 97115490A EP 0829306 B1 EP0829306 B1 EP 0829306B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- spray
- housing
- atomizer according
- spray atomizer
- 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
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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
-
- 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
Definitions
- the invention relates to a spray atomizer for applying electrically conductive paint, especially water-based paint, on surfaces with a housing, in which a drive motor for turning a front-mounted, with a paint supply connected spray head is arranged, the supplied Paint releases due to rotation in a spray, as well as with at least two themselves concentrically extending parallel or obliquely to the longitudinal axis of the housing to the front arranged, fed by at least one high voltage source and electrodes placed in electrode holders, which generate an electric field, that the spray emitted by the spray head against the application area pressurized (see e.g. U.S.-A-4,589,597).
- Rotary spray atomizers have long been electrostatic in the art Coating with electrically conductive paint is generally known (DE 31 30 096 C2 or DE 31 51 929C2). With such a device, one becomes rotatable stored and by an engine, preferably operated by a compressed air Motor, driven spray bell the paint to be applied and fed the centrifugal force caused by the rotation.
- an engine preferably operated by a compressed air Motor, driven spray bell the paint to be applied and fed the centrifugal force caused by the rotation.
- an all around electrical field generated around the spray head for use which with the help concentrically arranged electrodes from a common high voltage source be supplied, is generated.
- the surface to be coated is at a low potential, mostly Earth, switched, so that due to the resulting potential difference the paint particles charged by the electric field towards the application surface be accelerated where they stick.
- this is in the electrode holder arranged to supply the associated electrode high voltage source of a cascade consisting of diodes and capacitors, which as Voltage amplifier is used.
- Electrode holders are evenly spaced around the housing whose the front end is designed as a tip, which is the associated electrode receives.
- the radial distance between the housing and an electrode holder so that it at most corresponds to the diameter of the electrode holder.
- the length of an electrode holder corresponds to at least five times its diameter.
- High voltage can be set separately on each electrode.
- the division of the central high-voltage source to several high-voltage sources without supply line results in a significantly lower discharge energy. This reduces the hazard potential.
- Electrode holder arranged on a ring that concentrically surrounds the housing.
- the electrode holders can each also be arranged on holding arms which are attached radially to the housing.
- each high-voltage source with the associated electrode is a structural unit, which can be exchanged en bloc and thus enables rapid troubleshooting.
- the electrodes with high voltage that damage or contamination-related Failures of an electrode can be quickly recognized.
- the inventive design of the high voltage supply a simple if necessary, permanent monitoring of the electrical parameters in the low-voltage range allowed, namely on the supply line, are occurring Faults immediately recognized and displayed, so that the necessary remedial measures can be started suddenly.
- FIG. 1 shows a side view of a spray atomizer according to the invention.
- a spray atomizer 10 for processing electrically conductive Application materials with a housing 12 connected to ground, with a spray bell 14 on the front and two diametrically opposite arranged electrodes 16 shown on the free, to the front of the housing 12 facing ends 18 of electrode holders 20 are arranged.
- the electrode holders 20 are axially parallel to the longitudinal axis of the housing 12 a ring 26 arranged concentrically to the rear on the housing 12 and take, as in that shown in the single figure on the right Longitudinal section is shown, a high voltage source 22, which with the protruding electrode 16 cooperates on the front and via a schematic Line 24 shown is supplied with low voltage.
- a monitoring arrangement (not shown) can be placed in this low-voltage supply line be inserted, which monitors the electrical parameters.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Description
Die Erfindung betrifft einen Sprühzerstäuber zum Auftragen von elektrisch leitfähigem Lack, insbesondere Wasserlack, auf Oberflächen mit einem Gehäuse, in welchem ein Antriebsmotor zur Drehbetätigung eines frontseitig angesetzten, mit einer Lackzufuhr verbundenen Sprühkopfes angeordnet ist, der den zugeführten Lack infolge Rotation in einem Sprühnebel abgibt, sowie mit wenigstens zwei sich parallel oder schräg zur Längsachse des Gehäuses zur Frontseite hin erstreckenden konzentrisch angeordneten, von wenigstens einer Hochspannungsquelle gespeisten und in Elektrodenhaltern untergebrachten Elektroden, welche ein elektrisches Feld erzeugen, das den vom Sprühkopf abgegebenen Sprühnebel gegen die Auftragsfläche beaufschlagt (vgl. z.B. US-A-4 589 597).The invention relates to a spray atomizer for applying electrically conductive paint, especially water-based paint, on surfaces with a housing, in which a drive motor for turning a front-mounted, with a paint supply connected spray head is arranged, the supplied Paint releases due to rotation in a spray, as well as with at least two themselves concentrically extending parallel or obliquely to the longitudinal axis of the housing to the front arranged, fed by at least one high voltage source and electrodes placed in electrode holders, which generate an electric field, that the spray emitted by the spray head against the application area pressurized (see e.g. U.S.-A-4,589,597).
Rotationssprühzerstäuber sind im Stand der Technik seit langem zum elektrostatischen Beschichten mit elektrisch leitender Farbe allgemein bekannt (DE 31 30 096 C2 oder DE 31 51 929·C2). Bei einer derartigen Vorrichtung wird einer drehbar gelagerten und von einem Motor, vorzugsweise von einem mit Druckluft betriebenen Motor, angetriebenen Sprühglocke die aufzutragende Farbe zugeführt und infolge der rotationsbedingten Fliehkraft abgeschleudert. Hierbei kommt ein ringsum den Sprühkopf herum erzeugtes elektrische Feld zur Anwendung, welches mit Hilfe konzentrisch angeordneter Elektroden, die von einer gemeinsamen Hochspannungsquelle versorgt werden, erzeugt wird. Rotary spray atomizers have long been electrostatic in the art Coating with electrically conductive paint is generally known (DE 31 30 096 C2 or DE 31 51 929C2). With such a device, one becomes rotatable stored and by an engine, preferably operated by a compressed air Motor, driven spray bell the paint to be applied and fed the centrifugal force caused by the rotation. Here comes an all around electrical field generated around the spray head for use, which with the help concentrically arranged electrodes from a common high voltage source be supplied, is generated.
Die zu beschichtende Oberfläche ist hierbei auf ein niedriges Potential, meistens Erde, geschaltet, so daß infolge des hierdurch bedingten Potentialunterschiedes die vom elektrischen Feld aufgeladenen Farbpartikel zur Auftragsoberfläche hin beschleunigt werden, wo sie haften bleiben.The surface to be coated is at a low potential, mostly Earth, switched, so that due to the resulting potential difference the paint particles charged by the electric field towards the application surface be accelerated where they stick.
Diese Technik hat sich bewährt und wird weit verbreitet eingesetzt. Allerdings verursacht das Erfordernis der Hochspannungsversorgung der Elektroden aus einer Hochspannungsquelle über eine spezielle Zuleitung Unterbrechungen im Betrieb infolge von Problemen mit einer unzureichenden Isolation der Hochspannungs-Versorgungsleitung, wodurch die konstante Spannungsaufrechterhaltung beeinträchtigt wird. Durch die Hochspannungszuleitungen und die hohe gespeicherte Energie der mehrere Elektroden speisenden Kaskade ergibt sich ein Gefährdungspotential für die in diesem Bereich arbeitenden Menschen.This technique has proven itself and is widely used. However caused the requirement of high voltage supply of the electrodes from one High voltage source via a special supply line interruptions in operation due to problems with insufficient insulation of the high voltage supply line, which impairs constant tension maintenance becomes. Due to the high voltage supply lines and the high stored Energy of the cascade feeding several electrodes results in a hazard potential for the people working in this area.
Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, einen Rotationszerstäuber der eingangs genannten Art zu schaffen, bei welchem die genannten Schwierigkeiten auf einfache Weise vermieden werden.Based on this prior art, it is an object of the invention to To create rotary atomizers of the type mentioned, in which the above Difficulties can be easily avoided.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst. Weitere vorteilhafte Ausgestaltungen und Ausführungsformen der Erfindung sind in den Unteransprüchen gekennzeichnet. Gemäß der Erfindung ist daher vorgesehen, daß in jedem Elektrodenhalter eine Hochspannungsquelle angeordnet ist, welche die jeweils frontseitig angeordnete zugehörige Elektrode speist.This object is achieved by the characterizing features of Claim 1 solved. Further advantageous refinements and embodiments the invention are characterized in the subclaims. According to the invention it is therefore provided that one in each electrode holder High voltage source is arranged, which is arranged in each case on the front associated electrode feeds.
Mit dieser Art der Spannungsversorgung wird erreicht, daß lange Leitungswege der Hochspannungsversorgung mit einer Spannung von ca. 100 kV vermieden werden, da in Weiterbildung der Erfindung die Spannungsversorgung der in jedem Elektrodenhalter angeordneten Hochspannungsquelle je nach Leistungsbedarf von einer dem Rotationszerstäuber unmittelbar benachbarten Gleichspannungsquelle geringer Spannung, zum Beispiel ein Akkumulator, oder über eine Niederspannungsleitung vorgesehen ist und damit das Erfordernis einer aufwendigen Hochspannungsisolierung auf den Elektrodenhalter beschränkt ist.With this type of power supply it is achieved that long lines of the High voltage supply with a voltage of approx. 100 kV can be avoided since in a further development of the invention the voltage supply in each electrode holder arranged high voltage source depending on the power requirement of one the direct voltage source immediately adjacent to the rotary atomizer Voltage, for example an accumulator, or via a low-voltage line is provided and thus the need for complex high-voltage insulation is limited to the electrode holder.
Gemäß einer Ausgestaltung der Erfindung ist die jeweils in den Elektrodenhaltern zur Speisung der zugehörigen Elektrode angeordnete Hochspannungsquelle von einer aus Dioden und Kondensatoren bestehenden Kaskade gebildet, die als Spannungsverstärker dient.According to one embodiment of the invention, this is in the electrode holder arranged to supply the associated electrode high voltage source of a cascade consisting of diodes and capacitors, which as Voltage amplifier is used.
Ein weitere vorteilhafte Ausgestaltung der Erfindung sieht vor, daß mindestens zwei Elektrodenhalter gleichmäßig im Abstand um das Gehäuse angeordnet sind, deren frontseitiges Ende jeweils als Spitze ausgebildet ist, welche die zugehörige Elektrode aufnimmt.Another advantageous embodiment of the invention provides that at least two Electrode holders are evenly spaced around the housing whose the front end is designed as a tip, which is the associated electrode receives.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist der radiale Abstand zwischen dem Gehäuse und einem Elektrodenhalter so festgelegt, daß er höchstens dem Durchmesser des Elektrodenhalters entspricht.According to a preferred embodiment of the invention, the radial distance between the housing and an electrode holder so that it at most corresponds to the diameter of the electrode holder.
Dabei erweist es sich insbesondere als günstig, wenn die Länge eines Elektrodenhalter wenigstens seinem fünffachen Durchmesser entspricht.It proves to be particularly advantageous if the length of an electrode holder corresponds to at least five times its diameter.
Andererseits kann für die Ausbildung eines optimalen elektrischen Feldes die Hochspannung an jeder Elektrode separat eingestellt werden. Die Aufteilung der zentralen Hochspannungsquelle auf mehrere Hochspannungsquellen ohne Zuleitung hat eine wesentlich kleinere Entladeenergie zur Folge. Damit reduziert sich das Gefährdungspotential.On the other hand, for the formation of an optimal electric field High voltage can be set separately on each electrode. The division of the central high-voltage source to several high-voltage sources without supply line results in a significantly lower discharge energy. This reduces the hazard potential.
Vorteilhafterweise sind gemäß einer weiteren Ausgestaltung der Erfindung die Elektrodenhalter auf einem Ring angeordnet, der das Gehäuse konzentrisch umgibt.According to a further embodiment of the invention, the Electrode holder arranged on a ring that concentrically surrounds the housing.
Gemäß einer hierzu alternativen Gestaltung können die Elektrodenhalter jeweils auch auf Haltearmen angeordnet sein, welche radial am Gehäuse angebracht sind.According to an alternative design, the electrode holders can each also be arranged on holding arms which are attached radially to the housing.
Im Sinne einer einfachen Handhabung bildet gemäß einer Weiterbildung der Erfindung jede Hochspannungsquelle mit der zugehörigen Elektrode eine Baueinheit, die en bloc austauschbar ist und so eine rasche Störungsbehebung erlaubt.In terms of simple handling, according to a development of the invention each high-voltage source with the associated electrode is a structural unit, which can be exchanged en bloc and thus enables rapid troubleshooting.
Darüber hinaus verbindet sich mit dem erfindungsgemäßen Grundprinzip der Einzelversorgung der Elektroden mit Hochspannung, daß beschädigungs- oder verschmutzungsbedingte Ausfälle einer Elektrode rasch erkannt werden können. Da die erfindungsgemäße Ausbildung der Hochspannungsversorgung eine einfache gegebenenfalls permanente Überwachung der elektrischen Kenngrößen im Niederspannungsbereich erlaubt, nämlich an der Versorgungsleitung, werden auftretende Störungen unmittelbar erkannt und angezeigt, so daß die erforderlichen Abhilfemaßnahmen unvermittelt begonnen werden können.It also combines with the basic principle of individual care according to the invention the electrodes with high voltage that damage or contamination-related Failures of an electrode can be quickly recognized. There the inventive design of the high voltage supply a simple if necessary, permanent monitoring of the electrical parameters in the low-voltage range allowed, namely on the supply line, are occurring Faults immediately recognized and displayed, so that the necessary remedial measures can be started suddenly.
Diese und weitere vorteilhafte Ausgestaltungen und Verbesserungen der Erfindung sind Gegenstand der Unteransprüche.These and other advantageous refinements and improvements of the invention are the subject of the subclaims.
Anhand eines in der schematischen Zeichnung dargestellten Ausführungsbeispiels sollen die Erfindung, vorteilhafte Ausgestaltungen und Verbesserungen sowie besondere Vorteile der Erfindung näher erläutert und beschrieben werden.Using an exemplary embodiment shown in the schematic drawing the invention, advantageous refinements and improvements and special Advantages of the invention are explained and described in more detail.
Es zeigt die einzige Fig. eine Seitenansicht eines erfindungsgemäßen Sprühzerstäubers.The sole FIG. 1 shows a side view of a spray atomizer according to the invention.
In der einzigen Fig. ist ein Sprühzerstäuber 10 zur Verarbeitung von elektrisch leitfähigen
Auftragsstoffen mit einem an Masse liegenden Gehäuse 12, mit einem
frontseitig angesetzten Sprühglocke 14 sowie zwei diametral gegenüberliegend
angeordneten Elektroden 16 gezeigt, die an den freien, zur Frontseite des Gehäuses
12 zugewandten Enden 18 von Elektrodenhaltern 20 angeordnet sind.In the single figure is a
Die Elektrodenhalter 20 sind achsparallel zur Längsachse des Gehäuses 12 auf
einem rückwärtig am Gehäuse 12 konzentrisch anschließenden Ring 26 angeordnet
und nehmen, wie in dem in der einzigen Fig. auf der rechten Seite gezeigten
Längsschnitt dargestellt ist, eine Hochspannungsquelle 22 auf, welche mit der
frontseitig herausragenden Elektrode 16 zusammenarbeitet und über eine schematisch
dargestellte Leitung 24 mit Niederspannung versorgt wird.The
In diese Niederspannungsversorgungsleitung kann eine nicht dargestellte Überwachungsanordnung eingefügt sein, welche die elektrischen Parameter überwacht.A monitoring arrangement (not shown) can be placed in this low-voltage supply line be inserted, which monitors the electrical parameters.
Claims (9)
- Spray atomizer (10) for applying electrically conductive paint, in particular water-based paint, to surfaces, having a housing in which there is arranged a drive motor (40) for the rotary actuation of a spray head (14) which is fitted on the front, is connected to a supply of paint and discharges the supplied paint in a spray mist as a result of rotation, as well as having at least two electrode (16), which extend parallel or at an angle to the longitudinal axis of the housing towards the front side and generate an electric field which applies the spray mist discharged by the spray head to the application surface, characterized in that in each electrode holder there is arranged a high-voltage source (42) which feeds the associated electrode respectively arranged on the front.
- Spray atomizer according to Claim 1, characterized in that each high-voltage source (22) arranged in an electrode holder is connected to a low-voltage current source for supplying it.
- Spray atomizer according to Claim 1 or 2, characterized in that the high-voltage source arranged in each electrode holder for feeding the associated electrode (16) is formed by a cascade comprising diodes and capacitors, serving as a voltage multiplier.
- Spray atomizer according to one of the preceding claims, characterized in that at least two electrode holders (20) arranged at regular intervals around the housing are provided, the front end of the said holders being designed as a tip which receives the associated electrode (16).
- Spray atomizer according to one of the preceding claims, characterized in that the radial distance between the housing and an electrode holder (20) corresponds at most to the diameter of the electrode holder.
- Spray atomizer according to one of the preceding claims, characterized in that the length of an electrode holder (20) corresponds to at least five times its diameter.
- Spray atomizer according to one of the preceding claims, characterized in that the electrode holders (20) are arranged on a concentric ring which surrounds the housing.
- Spray atomizer according to one of Claims 1 to 6, characterized in that the electrode holders (20) are respectively arranged on holding arms which are attached radially to the housing.
- Spray atomizer according to one of the preceding claims, characterized in that each high-voltage source (22) forms with the associated electrode (16) a structural unit which can be exchanged en bloc.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19637308 | 1996-09-13 | ||
| DE19637308A DE19637308A1 (en) | 1996-09-13 | 1996-09-13 | Rotary spray atomizer |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0829306A2 EP0829306A2 (en) | 1998-03-18 |
| EP0829306A3 EP0829306A3 (en) | 1999-03-17 |
| EP0829306B1 true EP0829306B1 (en) | 2003-11-12 |
Family
ID=7805523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97115490A Expired - Lifetime EP0829306B1 (en) | 1996-09-13 | 1997-09-08 | Rotary atomising device |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0829306B1 (en) |
| DE (2) | DE19637308A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0913612B1 (en) | 1997-11-03 | 2003-04-02 | NOVOPRESS GMBH PRESSEN UND PRESSWERKZEUGE & CO. KG. | Procedure for connecting a pipe with a pipe coupling, a coupling between a pipe and a pipe coupling and a pipe coupling therefor |
| WO1999044748A1 (en) * | 1998-03-04 | 1999-09-10 | Abb Patent Gmbh | High voltage source rotary spray |
| IT1319500B1 (en) * | 2000-12-01 | 2003-10-20 | Abb Ricerca Spa | PAINTING CHAMBER WITH PERFECTED ELECTROSTATIC DISC |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3731145A (en) * | 1970-11-23 | 1973-05-01 | Nordson Corp | Electrostatic spray gun with self-contained miniaturized power pack integral therewith |
| GB1425506A (en) * | 1972-03-03 | 1976-02-18 | Redelec | High-voltage dc generator in an electrostatic apparatus |
| DE2514717A1 (en) * | 1975-04-04 | 1976-10-14 | Bauer Reinhold | Device for flock coating of surfaces with fibres - has high voltage transformer-amplifier connected to applicator |
| JPS6051867B2 (en) | 1980-08-04 | 1985-11-15 | 日本ランズバ−グ株式会社 | How to change paint color |
| DE3151929C2 (en) | 1981-12-30 | 1985-11-14 | Ransburg Gmbh, 6056 Heusenstamm | Device for the successive application of different coating liquids |
| US4589597A (en) * | 1983-10-03 | 1986-05-20 | Graco Inc. | Rotary atomizer spray painting device |
| US4771949A (en) * | 1984-10-29 | 1988-09-20 | Hermann Behr & Sohn Gmbh & Co. | Apparatus for electrostatic coating of objects |
| DE3616684A1 (en) * | 1986-05-16 | 1987-11-19 | Behr Industrieanlagen | SPRAYER FOR ELECTROSTATIC COATING OF OBJECTS |
| DE3709508A1 (en) * | 1987-03-23 | 1988-10-06 | Behr Industrieanlagen | Apparatus for the electrostatic coating of workpieces |
| US5044564A (en) * | 1989-11-21 | 1991-09-03 | Sickles James E | Electrostatic spray gun |
| DE4227455C2 (en) * | 1992-08-19 | 1996-04-04 | Wagner Int | Device for electrostatically re-coating the inner surfaces of welds |
| JPH08108106A (en) * | 1994-10-07 | 1996-04-30 | Ikuo Tochisawa | Method for electrostatic coating and electrostatic coating machine |
-
1996
- 1996-09-13 DE DE19637308A patent/DE19637308A1/en not_active Ceased
-
1997
- 1997-09-08 DE DE59710984T patent/DE59710984D1/en not_active Expired - Lifetime
- 1997-09-08 EP EP97115490A patent/EP0829306B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59710984D1 (en) | 2003-12-18 |
| EP0829306A3 (en) | 1999-03-17 |
| EP0829306A2 (en) | 1998-03-18 |
| DE19637308A1 (en) | 1998-03-19 |
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