EP0245849A2 - Sprayer for the electrostatic coating of objects - Google Patents
Sprayer for the electrostatic coating of objects Download PDFInfo
- Publication number
- EP0245849A2 EP0245849A2 EP87106943A EP87106943A EP0245849A2 EP 0245849 A2 EP0245849 A2 EP 0245849A2 EP 87106943 A EP87106943 A EP 87106943A EP 87106943 A EP87106943 A EP 87106943A EP 0245849 A2 EP0245849 A2 EP 0245849A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cover
- spray head
- atomizer according
- coated
- 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.)
- Granted
Links
- 238000009503 electrostatic coating Methods 0.000 title claims description 3
- 239000007921 spray Substances 0.000 claims abstract description 40
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 8
- 238000011109 contamination Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 4
- 230000004323 axial length Effects 0.000 claims description 3
- 239000012459 cleaning agent Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000003973 paint Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 2
- 230000005686 electrostatic field Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
-
- 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
- B05B5/001—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means incorporating means for heating or cooling, e.g. the material to be sprayed
Definitions
- the invention relates to an atomizer according to the preamble of claim 1.
- Known rotary atomizers e.g. serve for electrostatic coating of vehicle bodies, are contaminated in operation by the sprayed coating material.
- the bell-plate jacket, the area of the drive shaft between the spray bell and the front housing part containing the shaft bearing, and the outer surfaces of this housing part itself are particularly at risk.
- the undesired precipitation is not only lost for the object to be coated, but can in part be released during operation and only later hike to the object, which then eg becomes significantly dirty when changing colors.
- the known atomizers therefore have to be cleaned frequently and regularly in a relatively laborious and time-consuming manner, which means long periods of non-operation and a corresponding impairment, especially of the large-scale coating.
- the invention has for its object to provide an atomizer, the outer areas containing the drive and / or the storage of the spray head tend less to fogging by coating material than before and, if necessary, can be cleaned more easily.
- the rotating cover which can expediently be an extension of the bell plate or the like via the front housing end, could in itself be cleaned much more easily than fixed housing surfaces, for example by spraying a solvent onto the cover. Surprisingly, however, it has been shown that there is almost no inherent contamination of the rotating parts (cover and spray head). This may be due to the air currents generated due to the rotation.
- a rotary atomizer is known per se, the rotating spray head of which has an axially projecting cylindrical projection at its end facing away from the object to be coated, which closely encloses and also rotates around a cylindrical projection of the housing part containing the bearing (EP-A 0120648).
- the purpose of this construction is to seal an ink chamber formed between the housing and the spray head to the outside.
- the sprayed-off paint particles are charged by a bell electrode located inside the spray head and an additional electrode arranged outside with a small radial distance, which is surrounded by another outer electrode which serves to repel the paint particles.
- the cylindrical housing attachment surrounded by the spray head attachment does not lie in an area in which there is a particular risk of contamination from the sprayed coating material.
- This exemplary embodiment is an atomizer device which is particularly suitable for coating vehicle bodies with so-called water-based paints and has a rotary atomizer whose spray head 2, which is provided with a bell cup 3, can be mounted on a hollow shaft construction 4 containing a paint supply line, which is known in the front part 5 the housing of the atomizer is mounted.
- the spray head 2 is grounded during operation, so it is at the same potential as the body to be coated.
- a plurality of outer electrodes 6 are used, which are inserted at their rear end into an annular body 7 of insulating material surrounding the atomizer housing at a distance, in which an electrical conductor 8, which connects the electrodes to one another and is connected to a high-voltage line, against them the end face of the ring body facing the body is arranged in isolation.
- the arrangement and the mutual spacing of the electrodes are selected so that no significant deposit of coating material occurs on the end face of the ring body 7 during operation.
- the electrodes can expediently be arranged in pins 9 of insulating material projecting axially from the end face of the ring body 7 in a finger-like manner.
- Electrodes are provided, which are each arranged on their own radially protruding holders, as is known from DE-A 34 29 075.
- the invention is also suitable for spray devices in which the spray head itself is set to high voltage potential.
- a rotating cover 10 is provided for the front part 5 of the atomizer housing, the outer surfaces of which, including the end face, lie in an area of risk of contamination by the coating material sprayed from the bell cup 3.
- the generally cup-shaped cover 10 as shown can be made of metal, sits coaxially on the shaft construction 4 with a central opening of its bottom part 11 and is connected to it by e.g. two axial drive pins 12 connected in a rotationally secured manner.
- the pins 12 of the cover 10 can easily be inserted into axial bores in a corresponding end face of the shaft construction 4 without tools.
- the as a separate component e.g.
- the cover 10 is then fastened in a nut-like manner by means of a thread on the bell plate 3 screwed onto the shaft construction 4.
- the cover could also be integrally formed on the bell plate. Due to the described construction of the cover 10 and the bell plate 3 as two separate components, these may be Much easier to assemble on the drive shaft than a one-piece component (because you can hold the shaft with the cover when screwing on the bell cup).
- the generally sleeve-shaped part 14 of the cover 10 concentrically encloses the cylindri with a certain play cal outer surface of the housing part 5 and extends to a radially projecting housing part 20, the end face facing the spray head contains an annular slot 21 into which the annular rear edge of the sleeve-shaped cover part 14 engages all around.
- This arrangement which forms a type of labyrinth seal, prevents the penetration of coating material into the space between the cover 10 and the housing part 5, especially if compressed air is conducted into the slot 21.
- the bell plate 3 of the spray head 2 has, as shown, a sleeve-shaped outer wall 15, the outer surface of which is to be flush with the outer surface of the cover 10. Even better than with a cylindrical cover with a radially constant outer diameter, the deposition of coating material on the cover is avoided if its outer diameter is steadily smaller towards the rear, which is probably due to the corresponding changing peripheral speeds. The conical widening of the outer diameter continues forward on the outer wall 15 of the bell cup 3 up to the vicinity of the spraying edge 16.
- outlet openings 22 of the housing part 20 open. Air can escape through these openings, which on the one hand can serve as guiding air for supporting and shaping the spray jets in the direction of the object to be coated. On the other hand, the air emerging at this point can also contribute to the support and stabilization of the pollution-preventing air flows on and around the rotating cover 10, or may even be required.
- At least one outlet opening for a liquid or gaseous cleaning agent for the cover opens at the rear end of the cover 10.
- This can be the aforementioned air outlet openings 22 or separate openings 23.
- a separate cleaning device (not shown) which can be moved along its outer surface can be arranged for cleaning the cover 10.
- the cover 10 could also be rotatably supported and driven separately from the spray bell.
- One possibility for driving the cover enclosing the housing part 5 would be, for example, air nozzles arranged at its rear end.
- the housing part enclosed by the rotating cover 10 is the part containing the bearings of the spray head 2.
- the axial length of the cover i.e. the length of the covered part of the housing is at least as large as half (maximum) outer diameter of the spray head 2.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Abstract
Insbesondere bei Rotationszerstäubern mit Außenelektroden und geerdetem Sprühkopf besteht die Gefahr einer Eigenverschmutzung des vorderen Teils des Zerstäubergehäuses. Für diesen Teil ist deshalb eine rotierende Abdeckung (10) vorgesehen, die mit dem rotierenden Sprühkopf (2) verbunden sein kann. In particular in the case of rotary atomizers with external electrodes and grounded spray head, there is a risk of the front part of the atomizer housing becoming contaminated. A rotating cover (10) is therefore provided for this part, which can be connected to the rotating spray head (2).
Description
Die Erfindung betrifft einen Zerstäuber gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an atomizer according to the preamble of claim 1.
Bekannte Rotationszerstäuber , die z.B. zum elektrostatischen Beschichten von Fahrzeugkarossen dienen, werden im Betrieb durch das eigene abgesprühte Beschichtungsmaterial verschmutzt. Gefährdet sind insbesondere der Glockentellermantel, der Bereich der Antriebswelle zwischen der Sprühglocke und dem die Wellenlagerung enthaltenden vorderen Gehäuseteil und die Außenflächen dieses Gehäuseteils selbst. Der unerwünschte Niederschlag geht nicht nur für den zu beschichtenden Gegenstand verloren, sondern kann sich im Betrieb teilweise von selbst wieder lösen und erst später zu dem Gegenstand wandern, der dann z.B. bei einem Farbwechsel erheblich verschmutzt wird. Die bekannten Zerstäuber müssen deshalb häufig und regelmäßig in relativ mühsamer und zeitraubender Weise gereinigt werden, was lange Betriebszwangspausen und eine entsprechende Beeinträchtigung vor allem der Großserienbeschichtung bedeutet.Known rotary atomizers, e.g. serve for electrostatic coating of vehicle bodies, are contaminated in operation by the sprayed coating material. The bell-plate jacket, the area of the drive shaft between the spray bell and the front housing part containing the shaft bearing, and the outer surfaces of this housing part itself are particularly at risk. The undesired precipitation is not only lost for the object to be coated, but can in part be released during operation and only later hike to the object, which then eg becomes significantly dirty when changing colors. The known atomizers therefore have to be cleaned frequently and regularly in a relatively laborious and time-consuming manner, which means long periods of non-operation and a corresponding impairment, especially of the large-scale coating.
Diese Eigenverschmutzung ist nicht nur bei den konventionellen Rotationszerstäubern festzustellen (vgl. EP-PS 0032391), in denen das die Farbpartikel aufladende elektrostatische Feld zwischen der auf Hochspannung liegenden Sprühglocke und der geerdeten Karosse od. dgl. erzeugt wird, sondern in noch stärkerem Maße auch bei Vorrichtungen mit geerdetem Sprühkopf und Außenelektroden zur Erzeugung des elektrischen Feldes, bei denen kein der Verschmutzungsgefahr entgegenwirkender Potentialgradient zwischen dem Sprühkopf und dem zu beschichtenden Gegenstand vorhanden ist (vgl. DE-A 34 29075). Die Vorrichtungen mit Außenelektroden haben den Vorteil, sich für umweltfreundliche Lackmaterialien mit weniger organischen Bestandteilen zu eignen, die relativ stark leitfähig sind. Das Eigenverschmutzungsproblem bei Vorrichtungen mit Außenelektroden war aber bisher ein wesentliches Hindernis für die Verwendung von umweltfreundlichen Lackmaterialien.This inherent contamination is not only found in the conventional rotary atomizers (cf. EP-PS 0032391), in which the electrostatic field charging the paint particles between the high-voltage spray bell and the grounded body or the like is produced, but to an even greater extent also in devices with a grounded spray head and external electrodes for generating the electric field, in which there is no potential gradient between the spray head and the object to be coated, which counteracts the risk of contamination (cf. DE -A 34 29075). The devices with external electrodes have the advantage of being suitable for environmentally friendly coating materials with fewer organic components which are relatively highly conductive. The problem of self-pollution in devices with external electrodes has so far been a major obstacle to the use of environmentally friendly paint materials.
Der Erfindung liegt die Aufgabe zugrunde, einen Zerstäuber zu schaffen, dessen den Antrieb und/oder die Lagerung des Sprühkopfes enthaltende Außenbereiche weniger zum Beschlagen durch Beschichtungsmaterial neigen als bisher und, falls erforderlich, einfacher gereinigt werden können.The invention has for its object to provide an atomizer, the outer areas containing the drive and / or the storage of the spray head tend less to fogging by coating material than before and, if necessary, can be cleaned more easily.
Diese Aufgabe wird durch den im Anspruch 1 gekennzeichneten Zerstäuber gelöst.This object is achieved by the atomizer characterized in claim 1.
Die rotierende Abdeckung , bei der es sich zweckmäßig um eine Verlängerung des Glockentellers od. dgl. über das vordere Gehäuseende handeln kann, könnte an sich wesentlich einfacher gereinigt werden als feststehende Gehäuseflächen, beispielsweise durch Aufsprühen eines Lösungsmittels auf die Abdeckung. Überraschend hat sich aber gezeigt, daß fast überhaupt keine Eigenverschmutzung der rotierenden Teile (Abdeckung und Sprühkopf) auftritt. Dies liegt möglicherweise an den aufgrund der Rotation erzeugten Luftströmungen.The rotating cover, which can expediently be an extension of the bell plate or the like via the front housing end, could in itself be cleaned much more easily than fixed housing surfaces, for example by spraying a solvent onto the cover. Surprisingly, however, it has been shown that there is almost no inherent contamination of the rotating parts (cover and spray head). This may be due to the air currents generated due to the rotation.
Es ist an sich schon ein Rotationszerstäuber bekannt, dessen rotierender Sprühkopf an seinem dem zu beschichtenden Gegenstand abgewandten Ende einen axial vorspringenden zylindrischen Ansatz hat, welcher einen ebenfalls zylindrischen Ansatz des die Lagerung enthaltenden Gehäuseteils eng umschließt und um diesen rotiert (EP-A 0120648). Der Zweck dieser Konstruktion besteht aber im Unterschied zur Erfindung darin, eine zwischen dem Gehäuse und dem Sprühkopf gebildete Farbkammer nach außen abzudichten. Die Aufladung der abgesprühten Farbpartikel erfolgt bei dem bekannten Rotationszerstäuber durch eine innerhalb des Sprühkopfes befindliche Glockenelektrode und eine mit geringem radialen Abstand außerhalb angeordnete Zusatzelektrode, die von einer weiteren, zur Abstoßung der Farbpartikel dienenden Außenelektrode umgeben ist. Bei dieser Anordnung liegt der von dem Sprühkopfansatz umgebene zylindrische Gehäuseansatz nicht in einem Bereich, bei dem eine besondere Gefahr der Verschmutzung durch das abgesprühte Beschichtungsmaterial besteht.A rotary atomizer is known per se, the rotating spray head of which has an axially projecting cylindrical projection at its end facing away from the object to be coated, which closely encloses and also rotates around a cylindrical projection of the housing part containing the bearing (EP-A 0120648). The purpose of this construction, in contrast to the invention, is to seal an ink chamber formed between the housing and the spray head to the outside. In the known rotary atomizer, the sprayed-off paint particles are charged by a bell electrode located inside the spray head and an additional electrode arranged outside with a small radial distance, which is surrounded by another outer electrode which serves to repel the paint particles. With this arrangement, the cylindrical housing attachment surrounded by the spray head attachment does not lie in an area in which there is a particular risk of contamination from the sprayed coating material.
An dem in der Zeichnung dargestellten bevorzugten Ausführungsbeispiel wird die Erfindung näher erläutert. Es zeigen:
- Fig. 1 einen mit einer rotierenden Abdeckung versehenen Sprühkopf; und
- Fig. 2 eine schematische Gesamtansicht des Zerstäubers mit Außenelektroden.
- 1 shows a spray head provided with a rotating cover; and
- Fig. 2 is a schematic overall view of the atomizer with external electrodes.
Bei diesem Ausführungsbeispiel handelt es sich um eine insbesondere für die Beschichtung von Fahrzeugkarossen mit sogenannten Wasserlacken geeignete Zerstäubervorrichtung mit einem Rotationszerstäuber , dessen mit einem Glockenteller 3 versehener Sprühkopf 2 auf einer eine Farbzuführleitung enthaltenden Hohlwellenkonstruktion 4 montiert sein kann, die in bekannter Weise im vorderen Teil 5 des Gehäuses des Zerstäubers gelagert ist. Der Sprühkopf 2 wird im Betrieb geerdet, liegt also auf demselben Potential wie die zu beschichtende Karosse. Zum Erzeugen des erforderlichen elektrostatischen Feldes dienen eine Vielzahl von Außenelektroden 6, die an ihrem hinteren Ende in einen das Zerstäubergehäuse mit Abstand umgebenden Ringkörper 7 aus Isoliermaterial eingesetzt sind, in welchem ein die Elektroden ringartig miteinander verbindender , an eine Hochspannungsleitung angeschlossener elektrischer Leiter 8 gegen die der Karosse zugewandte Stirnfläche des Ringkörpers isoliert angeordnet ist. Die Anordnung und der gegenseitige Abstand der Elektroden sind so gewählt, daß im Betrieb kein wesentlicher Niederschlag von Beschichtungsmaterial auf der Stirnfläche des Ringkörpers 7 erfolgt. Die Elektroden können zweckmässig in fingerartig axial von der Stirnseite des Ringkörpers 7 vorspringenden Zapfen 9 aus Isoliermaterial angeordnet sein.This exemplary embodiment is an atomizer device which is particularly suitable for coating vehicle bodies with so-called water-based paints and has a rotary atomizer whose spray head 2, which is provided with a bell cup 3, can be mounted on a hollow shaft construction 4 containing a paint supply line, which is known in the front part 5 the housing of the atomizer is mounted. The spray head 2 is grounded during operation, so it is at the same potential as the body to be coated. To generate the required electrostatic field, a plurality of outer electrodes 6 are used, which are inserted at their rear end into an annular body 7 of insulating material surrounding the atomizer housing at a distance, in which an electrical conductor 8, which connects the electrodes to one another and is connected to a high-voltage line, against them the end face of the ring body facing the body is arranged in isolation. The arrangement and the mutual spacing of the electrodes are selected so that no significant deposit of coating material occurs on the end face of the ring body 7 during operation. The electrodes can expediently be arranged in
Statt der dargestellten Ringelektrodenanordnung , die genauer in der deutschen Patentanmeldung P 36 09 240.1 beschrieben ist, könnten auch radial um den Sprühkopf verteilte Außen elektroden vorgesehen sein, die jeweils an eigenen radial vom Gehäuse abstehenden Haltern angeordnet sind, wie dies aus der DE-A 34 29 075 bekannt ist. Die Erfindung eignet sich aber auch für Sprühvorrichtungen, bei denen der Sprühkopf selbst auf Hochspannungspotential gelegt wird.Instead of the ring electrode arrangement shown, which is described in more detail in German patent application P 36 09 240.1, radially distributed outside around the spray head could also be used electrodes are provided, which are each arranged on their own radially protruding holders, as is known from DE-A 34 29 075. The invention is also suitable for spray devices in which the spray head itself is set to high voltage potential.
Gemäß der Erfindung ist eine rotierende Abdeckung 10 für den vorderen Teil 5 des Zerstäubergehäuses vorgesehen, dessen Außenflächen einschließlich der Stirnfläche in einem Bereich der Gefahr der Verschmutzung durch das vom Glockenteller 3 abgesprühte Beschichtungsmaterial liegt. Die darstellungsgemäß allgemein becherförmige Abdeckung 10 kann aus Metall bestehen, sitzt mit einer Mittelöffnung ihres Bodenteils 11 koaxial auf der Wellenkonstruktion 4 und ist mit dieser durch z.B. zwei axiale Mitnehmerstifte 12 verdrehungsgesichert verbunden. Die Stifte 12 der Abdeckung 10 können ohne Werkzeug einfach in axiale Bohrungen in einer entsprechenden Stirnfläche der Wellenkonstruktion 4 eingesetzt werden. Durch den als gesondertes Bauteil z.B. mutterartig mittels eines Gewindes auf die Wellenkonstruktion 4 geschraubten Glockenteller 3 wird die Abdeckung 10 dann befestigt.According to the invention, a
Stattdessen könnte die Abdeckung auch dem Glockenteller einstückig angeformt sein. Durch die beschriebene Konstruktion der Abdeckung 10 und des Glockentellers 3 als zwei getrennte Bauteile sind diese aber u.U. wesentlich einfacher an der Antriebswelle montierbar als ein einstückiges Bauteil (weil man beim Aufschrauben des Glockentellers die Welle mit der Abdeckung festhalten kann).Instead, the cover could also be integrally formed on the bell plate. Due to the described construction of the
Der allgemein hülsenförmige Teil 14 der Abdeckung 10 umschließt mit einem gewissen Spiel konzentrisch die zylindri sche Außenfläche des Gehäuseteils 5 und reicht bis zu einem radial weiter vorspringenden Gehäuseteil 20, dessen dem Sprühkopf zugewandte Stirnfläche einen ringförmigen Schlitz 21 enthält, in den der ringförmige hintere Rand des hülsenförmigen Abdeckungsteils 14 umlaufend eingreift. Durch diese eine Art von Labyrinthdichtung bildende Anordnung wird das Eindringen von Beschichtungsmaterial in den Zwischenraum zwischen der Abdeckung 10 und dem Gehäuseteil 5 vermieden, vor allem, wenn man Druckluft in den Schlitz 21 leitet.The generally sleeve-
Der Glockenteller 3 des Sprühkopfes 2 hat darstellungsgemäß eine hülsenförmige Außenwand 15, deren Außenfläche lückenlos mit der Außenfläche der Abdeckung 10 fluchten soll. Noch besser als durch eine zylindrische Abdeckung mit radial gleichbleibendem Außendurchmesser wird die Ablagerung von Beschichtungsmaterial auf der Abdeckung vermieden, wenn ihr Außendurchmesser darstellungsgemäß nach hinten stetig kleiner wird, was vermutlich an den sich entsprechend ändernden Umfangsgeschwindigkeiten liegt. Die konische Erweiterung des Außendurchmessers setzt sich nach vorne auf der Außenwand 15 des Glockentellers 3 bis in die Nähe der Absprühkante 16 fort.The bell plate 3 of the spray head 2 has, as shown, a sleeve-shaped
Radial außerhalb, aber in der Nähe der Außenfläche der Abdeckung 10 münden Austrittsöffnungen 22 des Gehäuseteils 20. Durch diese Öffnungen kann Luft austreten, die einerseits als Lenkluft zur Unterstützung und Formung der Sprühstrahlen in Richtung zum zu beschichtenden Gegenstand dienen kann. Andererseits kann die an dieser Stelle austretende Luft aber auch zur Unterstützung und Stabilisierung der die Verschmutzung verhindernden Luftströmungen an und um die rotierende Abdeckung 10 beitragen oder sogar erforderlich sein.Radially outside, but in the vicinity of the outer surface of the
Es kann auch zweckmässig sein, daß am hinteren Ende der Abdeckung 10 mindestens eine Austrittsöffnung für ein flüssiges oder gasförmiges Reinigungsmittel für die Abdeckung mündet. Hierbei kann es sich um die erwähnten Luftaustrittsöffnungen 22 oder um gesonderte Öffnungen 23 handeln. Ferner kann zum Reinigen der Abdeckung 10 eine längs ihrer Außenfläche bewegbare gesonderte Reinigungsvorrichtung (nicht dargestellt) angeordnet werden.It may also be expedient that at least one outlet opening for a liquid or gaseous cleaning agent for the cover opens at the rear end of the
U.U. ist es nicht notwendig, daß die Abdeckung 10 mit derselben relativ hohen Drehzahl rotiert wie die Sprühglocke. Statt der oben beschriebenen Ausführungsform könnte man in solchen Fällen die Abdeckung auch getrennt von der Sprühglocke drehbar lagern und antreiben. Eine Möglichkeit zum Antrieb der den Gehäuseteil 5 umschließenden Abdeckung wären beispielsweise an ihrem hinteren Ende angeordnete Luftdüsen.U.U. it is not necessary for the
Da durch die ggf. mit dem Sprühkopf verbundene Abdeckung 10 die Lager der Wellenkonstruktion 4 etwas stärker belastet werden als bisher, kann eine besondere Kühlung der Lager, vorzugsweise durch Druckluft erforderlich sein.Since the bearing of the shaft construction 4 is loaded somewhat more than before by the
Gemäß dem beschriebenen Ausführungsbeispiel handelt es sich bei dem von der rotierenden Abdeckung 10 umschlossenen Gehäuseteil um den die Lager des Sprühkopfes 2 enthaltenden Teil. Es kann aber in anderen Fällen auch zweckmäßig sein, andere Gehäuseteile erfindungsgemäß abzudecken, die in einem Bereich der Gefahr einer Verschmutzung durch das abgesprühte Beschichtungsmaterial liegen. In der Regel ist die axiale Länge der Abdeckung, d.h. die Länge des abgedeckten Teils des Gehäuses mindestens so groß wie der halbe (maximale) Außendurchmesser des Sprühkopfes 2.According to the exemplary embodiment described, the housing part enclosed by the rotating
Claims (16)
dadurch gekennzeichnet,
daß eine rotierende Abdeckung (10) für den in dem Verschmutzungsbereich liegenden Gehäuseteil (5) vorgesehen ist.1.) Atomizer for electrostatic coating of objects, with a spray head (2), which is rotatably mounted on or in a housing part (5), the outer surface of which is in an area where there is a risk of contamination from the sprayed coating material, in particular with a spray head ( 2), which is at the same low potential in operation as the object to be coated, and electrodes (6) arranged radially outside the spray head (2) for charging the sprayed-off particles,
characterized,
that a rotating cover (10) is provided for the housing part (5) lying in the contamination region.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863616684 DE3616684A1 (en) | 1986-05-16 | 1986-05-16 | SPRAYER FOR ELECTROSTATIC COATING OF OBJECTS |
DE3616684 | 1986-05-16 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0245849A2 true EP0245849A2 (en) | 1987-11-19 |
EP0245849A3 EP0245849A3 (en) | 1988-10-26 |
EP0245849B1 EP0245849B1 (en) | 1991-03-06 |
Family
ID=6301054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87106943A Expired - Lifetime EP0245849B1 (en) | 1986-05-16 | 1987-05-13 | Sprayer for the electrostatic coating of objects |
Country Status (4)
Country | Link |
---|---|
US (1) | US4760965A (en) |
EP (1) | EP0245849B1 (en) |
DE (2) | DE3616684A1 (en) |
ES (1) | ES2020665B3 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2224671A (en) * | 1988-09-23 | 1990-05-16 | Graco Inc | "rotary atomizer" |
GB2250698A (en) * | 1988-09-23 | 1992-06-17 | Graco Inc | Rotary atomizer |
DE4342336A1 (en) * | 1993-12-11 | 1995-06-14 | Abb Patent Gmbh | Rotary atomiser, e.g. for paint spraying |
DE19611369A1 (en) * | 1996-03-22 | 1997-09-25 | Duerr Gmbh & Co | Rotary atomizer for electrostatically assisted coating of objects with paints or varnishes |
DE102005015604A1 (en) * | 2005-04-05 | 2006-10-19 | Dürr Systems GmbH | Rotary atomizer component for coating components of vehicle, has bushing-shaped shaft cover which covers bearing shaft when mounted partially in area of annular gap |
DE102006057596A1 (en) * | 2006-12-06 | 2008-06-19 | Dürr Systems GmbH | Lenkluftring with a ring trough and corresponding bell plate |
DE102008027997A1 (en) * | 2008-06-12 | 2009-12-24 | Dürr Systems GmbH | Universalzerstäuber |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3609240C2 (en) * | 1986-03-19 | 1996-08-01 | Behr Industrieanlagen | Device for the electrostatic coating of objects |
EP0283918B1 (en) * | 1987-03-23 | 1991-07-10 | Behr Industrieanlagen GmbH & Co. | Device for electrostatic coating of objects |
DE8708312U1 (en) * | 1987-06-12 | 1987-07-30 | Behr Industrieanlagen GmbH & Co, 74379 Ingersheim | Device for atomizing liquid paint |
DE4105116C2 (en) * | 1991-02-19 | 2003-03-27 | Behr Industrieanlagen | Apparatus and method for the electrostatic coating of objects |
JP2830683B2 (en) * | 1992-09-11 | 1998-12-02 | トヨタ自動車株式会社 | Rotary atomizing electrostatic coating equipment |
US5226605A (en) * | 1992-09-30 | 1993-07-13 | Barr & Murphy (Canada) Ltee/Ltd. | Rotary atomizer disk with replaceable nozzle inserts and method for replacing inserts |
DE19637308A1 (en) * | 1996-09-13 | 1998-03-19 | Abb Patent Gmbh | Rotary spray atomizer |
US5865379A (en) * | 1997-05-12 | 1999-02-02 | Agco Corporation | Isolator for depending components on electrostatic field sprayer boom |
US7455249B2 (en) | 2006-03-28 | 2008-11-25 | Illinois Tool Works Inc. | Combined direct and indirect charging system for electrostatically-aided coating system |
US20080011333A1 (en) * | 2006-07-13 | 2008-01-17 | Rodgers Michael C | Cleaning coating dispensers |
US7520450B2 (en) * | 2006-10-10 | 2009-04-21 | Illinois Tool Works Inc. | Electrical connections for coating material dispensing equipment |
GB0625583D0 (en) * | 2006-12-21 | 2007-01-31 | Itw Ltd | Paint spray apparatus |
US20090020626A1 (en) * | 2007-07-16 | 2009-01-22 | Illinois Tool Works Inc. | Shaping air and bell cup combination |
US8096264B2 (en) * | 2007-11-30 | 2012-01-17 | Illinois Tool Works Inc. | Repulsion ring |
US10155233B2 (en) * | 2008-04-09 | 2018-12-18 | Carlisle Fluid Technologies, Inc. | Splash plate retention method and apparatus |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2967669A (en) * | 1958-03-05 | 1961-01-10 | Edward O Norris | Centrifugal spraying device |
EP0034278A2 (en) * | 1980-02-15 | 1981-08-26 | BASF Lacke + Farben AG | Method and apparatus for the electrostatic coating of articles by means of a fluid |
DE3429075A1 (en) * | 1984-08-07 | 1986-02-20 | Hermann Behr & Sohn Gmbh & Co, 7121 Ingersheim | Device for the electrostatic coating of articles |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2047699A (en) * | 1934-02-05 | 1936-07-14 | Harold L Periman | Spraying apparatus for liquid and semiliquid material |
NL270215A (en) * | 1960-11-02 | |||
FR2336183A1 (en) * | 1975-12-26 | 1977-07-22 | Marchand Bernard | Compensating air ring for electrostatic paint applicator - with jets directed forwards behind rotating spray disc to prevent paint blowback |
FR2412351A1 (en) * | 1977-12-20 | 1979-07-20 | Air Ind | ELECTROSTATIC PAINTING PROJECTOR WITH BOWL OR ROTATING DISC WITH A PNEUMATIC SEAL |
US4376135A (en) * | 1981-03-20 | 1983-03-08 | Binks Manufacturing Company | Apparatus for atomization in electrostatic coating and method |
DE3214314A1 (en) * | 1982-04-19 | 1983-10-20 | J. Wagner AG, 9450 Altstätten | ELECTROSTATIC SPRAYER |
US4529672A (en) * | 1983-03-29 | 1985-07-16 | Union Carbide Corporation | Process of making electrochemical electrodes and electrodes made thereby |
JPS60168917A (en) * | 1984-02-10 | 1985-09-02 | Nissan Motor Co Ltd | Gas bearing device |
GB8428288D0 (en) * | 1984-11-08 | 1984-12-19 | Pye B J | Electrostatic sprayers |
-
1986
- 1986-05-16 DE DE19863616684 patent/DE3616684A1/en not_active Withdrawn
-
1987
- 1987-02-09 US US07/012,426 patent/US4760965A/en not_active Expired - Lifetime
- 1987-05-13 DE DE8787106943T patent/DE3768327D1/en not_active Expired - Fee Related
- 1987-05-13 EP EP87106943A patent/EP0245849B1/en not_active Expired - Lifetime
- 1987-05-13 ES ES87106943T patent/ES2020665B3/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2967669A (en) * | 1958-03-05 | 1961-01-10 | Edward O Norris | Centrifugal spraying device |
EP0034278A2 (en) * | 1980-02-15 | 1981-08-26 | BASF Lacke + Farben AG | Method and apparatus for the electrostatic coating of articles by means of a fluid |
DE3429075A1 (en) * | 1984-08-07 | 1986-02-20 | Hermann Behr & Sohn Gmbh & Co, 7121 Ingersheim | Device for the electrostatic coating of articles |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2224671A (en) * | 1988-09-23 | 1990-05-16 | Graco Inc | "rotary atomizer" |
GB2250698A (en) * | 1988-09-23 | 1992-06-17 | Graco Inc | Rotary atomizer |
GB2224671B (en) * | 1988-09-23 | 1992-12-23 | Graco Inc | Rotary atomizer |
GB2250698B (en) * | 1988-09-23 | 1992-12-23 | Graco Inc | Rotary atomizer |
DE4342336A1 (en) * | 1993-12-11 | 1995-06-14 | Abb Patent Gmbh | Rotary atomiser, e.g. for paint spraying |
DE19611369A1 (en) * | 1996-03-22 | 1997-09-25 | Duerr Gmbh & Co | Rotary atomizer for electrostatically assisted coating of objects with paints or varnishes |
DE102005015604A1 (en) * | 2005-04-05 | 2006-10-19 | Dürr Systems GmbH | Rotary atomizer component for coating components of vehicle, has bushing-shaped shaft cover which covers bearing shaft when mounted partially in area of annular gap |
DE102005015604B4 (en) * | 2005-04-05 | 2007-04-12 | Dürr Systems GmbH | Rotationszerstäuberbauteil |
DE102006057596A1 (en) * | 2006-12-06 | 2008-06-19 | Dürr Systems GmbH | Lenkluftring with a ring trough and corresponding bell plate |
US8827181B2 (en) | 2006-12-06 | 2014-09-09 | Durr Systems Gmbh | Shaping air ring comprising an annular cavity and corresponding bell cup |
DE102008027997A1 (en) * | 2008-06-12 | 2009-12-24 | Dürr Systems GmbH | Universalzerstäuber |
US8881672B2 (en) | 2008-06-12 | 2014-11-11 | Duerr Systems, Gmbh | Universal atomizer |
Also Published As
Publication number | Publication date |
---|---|
EP0245849B1 (en) | 1991-03-06 |
DE3616684A1 (en) | 1987-11-19 |
EP0245849A3 (en) | 1988-10-26 |
US4760965A (en) | 1988-08-02 |
DE3768327D1 (en) | 1991-04-11 |
ES2020665B3 (en) | 1991-09-01 |
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