EP1475159B1 - Powder spray coating device - Google Patents

Powder spray coating device Download PDF

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Publication number
EP1475159B1
EP1475159B1 EP04007899A EP04007899A EP1475159B1 EP 1475159 B1 EP1475159 B1 EP 1475159B1 EP 04007899 A EP04007899 A EP 04007899A EP 04007899 A EP04007899 A EP 04007899A EP 1475159 B1 EP1475159 B1 EP 1475159B1
Authority
EP
European Patent Office
Prior art keywords
holes
coating material
spray
air
flow path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04007899A
Other languages
German (de)
French (fr)
Other versions
EP1475159A1 (en
Inventor
Felix Mauchle
Hanspeter Michael
Hanspeter Vieli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
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Filing date
Publication date
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Publication of EP1475159A1 publication Critical patent/EP1475159A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • 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
    • B05B5/0418—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces designed for spraying particulate material
    • 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
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
    • 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
    • B05B5/0407—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 with a spraying edge, e.g. like a cup or a bell
    • 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
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • the invention relates to a spray device for coating material, in particular coating powder, according to the preamble of claim 1.
  • the invention relates to a spray device which has at least one high-voltage electrode for electrostatically charging the coating material.
  • a spray device which has at least one high-voltage electrode for electrostatically charging the coating material.
  • sprayers which are not designed for the electrostatic charging of coating material.
  • Sprayers of this type are known, for. Example from US 4,324,361, DE 34 12 694 A1, US 4,505,430, US 4,196,465 US 4,347,984 and US 6,189,804.
  • Document EP-A-0 295 366 discloses a generic coating material sprayer having a coating material channel, a spray outlet at the downstream end of the coating material channel for spraying the coating material onto an object to be coated, and having a shaping air outlet for shaping compressed air which is close to the surface Spray outlet and the flow path of the coating material extends around, separated from the flow path, and is adapted to generate from compressed air forming air flow surrounding the coating material spray jet.
  • the shaping air outlet is formed by a large number of holes in a body, which are distributed around the flow path of the coating material, separated therefrom, and which face forward to the coating material spray jet.
  • a disadvantage of sprayers with an annular gap as Formungs Kunststoffauslass is that even if the gap is supported in the gap longitudinal direction at several points between the two parts forming it, not uniformly large can be formed, for technical reasons. This disadvantage is not given if bores are used instead of an annular gap, especially then; when the body in which the holes are formed is undivided at the bore location.
  • Such sprayers show z. EP 0 767 005 B1, EP 0 744 998 B1 and DE 34 31 785 C2.
  • the object of the invention is to achieve the object of achieving an equally good or better efficiency with regard to the action on the coating material spray stream and also with regard to the coating quality and with respect to the amount of coating material required for the coating with less amount of shaping air per unit time.
  • the invention relates to a spray device for coating material, in particular coating powder, comprising a coating material channel; a spray outlet at the downstream end of the coating material channel for spraying the coating material onto an object to be coated; a shaping air outlet for shaping compressed air, which extends close to the spray outlet and the flow path of the coating material, separated from the flow path, and is adapted to generate from compressed air a forming air flow enveloping the coating material spray jet; wherein the shaping air outlet is formed by a large plurality of holes in a body distributed around the flow path of the coating material, separate therefrom, and facing forwardly to the coating material spray, characterized in that an ambient air passage is spaced relative to Holes are provided offset radially inward, which extends from one behind the body; in which the holes are formed, located ambient air entry point to an air outlet located in front of the body in which the holes are formed and extending in one or more openings around the flow path of the coating material, separated from this Strömühgsweg, such that ambient air can be s
  • FIGs. 1 and 2 show only one of many possible embodiments of the invention.
  • the spraying apparatus shown in FIGS. 1 and 2 is designed for spraying coating powder, but instead could also be designed for spraying liquid coating material.
  • the sprayer includes a coating material channel 2; a spray outlet 4 at the downstream end of the coating material channel 2 for spraying the coating material 6 in the form of a coating material spray stream 8 onto an object to be coated (not shown); and a shaping air outlet 10 for shaping compressed air 12, which extends around the flow path of the coating material 6, separated from the flow path, close to the spray outlet 8 and is adapted to receive from the shaping compressed air 12 a Coating material spray 8 enveloping shaping air flow 11 to produce.
  • the shaping air outlet 10 is formed by a large plurality of holes 14 which extend through a body 16 undivided at the holes and are distributed around the flow path of the coating material 6, separated from this flow path.
  • the holes 14 are each arranged with the same circumferential distance 18 from each other concentrically concentric around the axial center axis 20 of the flow path of the coating material 6 around.
  • the holes may also be arranged in another form, for example oval or polygonal, around the central axial axis 20 in order to produce a specific cross-sectional shape of the spray stream 8.
  • the circumferential distance 18 between the holes 14 is so small that the emerging from them forming air jets 22 flow together by radial Expanison to a circular cross-sectional shaping air flow, preferably immediately after the holes 14 before they hit the spray stream 8, but at the latest at the point of impact on the Spray stream 8.
  • the holes 14 are directed forward as viewed in the coating material spraying direction, preferably parallel to the axial center axis 20, and preferably formed in a forwardly facing end surface. According to another embodiment, they may also be directed obliquely to the axial central axis 20, pointing either towards or away from it. By the direction of the holes 14 relative to the axial center axis 20 and by the pressure strength of the compressed air 12, the cross-sectional shape and cross-sectional size of the spray stream 8 can be adjusted.
  • At or near the flow path of the coating material is at or near the spray outlet 4 at least one or more electrodes, z. B. 23, 24 and / or 25, which is connected to a high voltage generator 26 for electrostatic charging of the coating material 6 or are.
  • the high voltage generator 26 may be located externally of the sprayer or as shown in FIG. 1 in the sprayer. It generates from a AC voltage a higher Gteichschreib, which may for example be in the range between 4 kV and 150 kV.
  • the sprayer has a low voltage AC voltage terminal 28 for supplying low voltage AC voltage to the high voltage generator 26; a coating material port 30 for supplying coating material to the coating material channel 2; and a molding compressed air port 32 for supplying molding compressed air 12 to a manifold 34 connecting the holes 14 at their upstream.
  • each hole 14 there are at least ten or more holes 14, for example at least twenty, thirty or forty, or any plurality.
  • the circumferential distance 18 of the holes 14 from each other is at least a factor of two or more greater than the opening size 38 of the holes 14 in the circumferential direction about the axial center axis 20.
  • the factor has a larger shipyard, for example, the value five or more, for example, ten or more.
  • the opening area of each hole 14 is smaller than 2.0 mm 2 , for example, smaller than 1.0 mm 2 or more preferably smaller than 0.5 mm 2 or smaller than 0.3 mm 2 .
  • the goal is to make the holes as small as possible, as is technically feasible, to thereby produce a fast flowing, high energy shaping air jet 22 at each hole 14 and therefrom a high energy shaping air stream 11 with a minimum possible forming air flow rate per unit time.
  • an effective influencing of the cross-sectional shape and cross-sectional size of the spray stream 8 is achieved with a small amount of air per unit time. Due to the very small cross-sectional size of the individual holes 14, a same shaping air flow rate per unit time is achieved at all holes, even if all holes 14 have the same cross-section and the distribution channel 34 on its whole Length has a constant cross-sectional size.
  • the small cross-sectional size of the holes 14 causes a uniform air pressure distribution over the entire length of the distribution channel 34.
  • the sum of the total cross-sectional sizes of all holes 14 is smaller, z. B. only half as large as the cross-flow section of the distribution channel 34th
  • the holes 14 preferably each have a cross-sectionally circular cross-section, but may also have a different cross-section, for example a polygonal cross-sectional shape.
  • the holes 14 may be formed during manufacture of the body 16 in which they are formed during the body fabrication process, for example by injection molding to make the body 16 and simultaneously make the holes 14. According to another preferred embodiment, the holes 14 are by drilling formed in the body 16.
  • the body 16 may be made of a rigid material, such as a metal tube or a plastic tube, or of an elastic or flexible material, e.g. a hose, z. B. rubber or plastic.
  • Figs. 1 and 2 show an embodiment in which the body 16 is a hose or a pipe in which the holes 14 are drilled and whose hose chamber or interior forms the distribution channel 34.
  • the body 16 may be a part of the housing 40 or a housing part attached to this housing 40 of the sprayer 2, or an additional body 16 as shown in FIGS. 1 and 2.
  • This additional body 16 is attached to the housing 40 of the sprayer but may Also attached to another member which is fixed to the housing 40, for example, on a front end piece 42 which forms the spray or 4 and is attached to the housing 40.
  • the outlet end of the holes 14 is offset upstream relative to the spray outlet 4. According to another embodiment, however, the outlet end of the holes 14 could lie in the same transverse plane or downstream of the transverse plane, in which also the Spray outlet 4 is located. It is essential that the shaping air stream 11 envelops the spray stream 8 so close to the spray outlet 4 that no coating material particles can escape from the coating material stream radially outwards or backwards onto the outer peripheral areas of the spray device
  • the holes 14 can be made to a predetermined size with much greater accuracy than gaps extending circumferentially about the axial center axis 20. Furthermore, fewer holes pose the risk of dimensional changes due to temperature effects and external mechanical influences, for example impacts due to impacts on other objects.
  • the body 16, which is provided with the holes 14, is secured to the housing 40 by one or more members 44, preferably webs with gaps between them, such that the body 16 is supported by the housing 40 directly or via intermediate members.
  • an ambient air passageway 50 is provided spaced radially inwardly relative to the holes 14, which deviates from an ambient air entry point 52 extending beyond the body 16 having the holes 14 to a front of the body 16
  • Air outlet 54 extends and which extends in the form of one or more slots or other openings around the flow path of the coating material 6, separated from this flow path, and thus around the axial center axis 20 around, so that ambient air 56 from the rear air inlet point 52 to the front air outlet point 54 is sucked through the ambient air passage 50 by the suction effect of the coating material spray stream 8 and / or by the suction effect of the shaping compressed air jets 22 and the shaping air stream 11.
  • This ambient air passage 50 prevents backflow of coating material particle On the outer surfaces of the sprayer and its Body 16 containing the holes 14. This prevents contamination of these parts.
  • all the holes 14 have fluid communication with each other through the compressed air distribution channel 34 with a compressed air inlet port 62.
  • two or more groups of such holes 14 may be in fluid communication with each other through a portion of the distribution channel 34, the portions being fluidly separated from one another and each portion having its own compressed air inlet port 62. This allows a finer adjustment of the amount of compressed air emerging from the holes 14 per unit of time, preferably in that the same amount of compressed air flows out of all the holes per unit of time, or according to another embodiment, different amounts of compressed air flow out per unit of time.
  • the opening cross-section of the distribution channel 34 (or its separate sections) and the opening cross-sections of the holes 14 are coordinated so that from all holes 14, the same amount of compressed air per unit time can flow.
  • the amount of compressed air exiting the holes 14 per unit time is dependent on the flow resistance in the distribution channel 34 between the inlet port 62 and the respective hole 14.
  • An equal amount of compressed air per unit time can be achieved at all holes 14 in that either the distribution channel 34 in the direction of the nearest hole 14 to the remote hole 14 has an increasingly smaller resistance or preferably in that the holes have an increasingly larger opening cross-section with increasing distance from the compressed air inlet opening 62.
  • the hole 14 which is the shortest flow path from the inlet opening 62, the smallest opening cross-section, and the farthest hole 14 has the largest opening cross-section.
  • such measures are technically complex and expensive. They can also be used in the invention.
  • the opening cross-sections in the manner mentioned so small that even without such measures on all holes 14 an equal shaping air flow rate per unit time is achieved.
  • All embodiments of the invention are suitable for all types of sprayers for coating material, in particular for powdery coating material, for example for sprayers with a spray outlet in the form of a round jet nozzle or flat jet nozzle, with cylindrical or funnel-like shape, with or without baffle body 60 or bluff body, and also for sprayers whose spray outlet 4 is provided with or formed by a rotary body.
  • the invention is also suitable for corona spray devices, in which corona discharges are generated at the at least one high-voltage electrode 23, 24, 25, and also for so-called tribo-spraying devices, in which the electrostatic charge of the spray coating material particles is generated in the coating material channel 2 by friction ,
  • the invention enables a homogeneous air distribution of the shaping compressed air to the spray stream 8 around. For this purpose, only a small amount of compressed air per unit of time is needed.
  • the shaping air stream 11 produced according to the invention has a stabilizing effect on the spray stream 8, which has the shape of a spray cloud rather than a spray jet.
  • This spray stream 8 or spray cloud is significantly less sensitive to air currents in a coating booth than in the prior art. This has the further advantage that the order efficiency of the coating powder on an object to be coated and the coating quality, eg. B. Bechichtungsmaschine be substantially increased.
  • Sprayers of this type are commonly referred to as a spray gun or spray gun, both when provided with a handle for manual operation, as well as when they are straight or angular automatic guns are formed, which are held by a Vorrichtuhg, z. B. from a robot, Hubmenr or stationary carrier.

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  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The spray device for especially coating powder has an ambient air passage (50) offset radially inwards by a distance relative to the forming air outlet holes (14) and extends from an ambient air inlet point (52) lying behind a component (16) in which the holes are formed to an air outlet point (54) in front of it. Ambient air (56) is drawn from the rear air inlet point to the front air outlet point through the ambient air passage by flow suction action of the coating material spray jet and/or through flow suction action of the forming air flow (11).

Description

Die Erfindung betrifft ein Sprühgerät für Beschichtungsmaterial, insbesondere Beschichtungspulver, gemäß dem Oberbegriff von Anspruch 1.The invention relates to a spray device for coating material, in particular coating powder, according to the preamble of claim 1.

Insbesondere betrifft die Erfindung ein Sprühgerät, welches mindestens eine Hochspannungselektrode zum elektrostatischen Aufladen des Beschichtungsmaterials aufweist. Sie ist jedoch auch für Sprühgeräte verwendbar, welche nicht zur elektrostatischen Aufladung von Beschichtungsmaterial ausgebildet sind.In particular, the invention relates to a spray device which has at least one high-voltage electrode for electrostatically charging the coating material. However, it is also suitable for sprayers which are not designed for the electrostatic charging of coating material.

Sprühgeräte dieser Art sind bekannt, z. B. aus der US 4,324,361, DE 34 12 694 A1, US 4,505,430, US 4,196,465 US 4,347,984 und US 6,189,804.Sprayers of this type are known, for. Example from US 4,324,361, DE 34 12 694 A1, US 4,505,430, US 4,196,465 US 4,347,984 and US 6,189,804.

Das Dokument EP-A-0 295 366 offenbart ein gattungsgemäßes Sprühgerät für Beschichtungsmaterial mit einem Beschichtungsmaterialkanal, einem Sprühauslass am stromabwärtigen Ende des Beschichtungsmaterialkanals zum Sprühen des Beschichtungsmaterials auf ein zu beschichtendes Objekt, und mit einem Formungsluftauslass für Formungs-Druckluft, welcher sich nahe bei dem Sprühauslass und dem Strömungsweg des Beschichtungsmaterials herum erstreckt, getrennt von dem Strömungsweg, und ausgebildet ist, um aus Druckluft einen den Beschichtungsmaterial-Sprühstrahl einhüllenden Formungsluftstrom zu erzeugen. Der Formungsluftauslass ist durch eine große Anzahl von Löchern in einem Körper gebildet, welche um den Strömungsweg des Beschichtungsmaterials, getrennt von diesem, herum verteilt angeordnet sind, und welche nach vorne zum Beschichtungsmaterial-Sprühstrahl zeigen.Document EP-A-0 295 366 discloses a generic coating material sprayer having a coating material channel, a spray outlet at the downstream end of the coating material channel for spraying the coating material onto an object to be coated, and having a shaping air outlet for shaping compressed air which is close to the surface Spray outlet and the flow path of the coating material extends around, separated from the flow path, and is adapted to generate from compressed air forming air flow surrounding the coating material spray jet. The shaping air outlet is formed by a large number of holes in a body, which are distributed around the flow path of the coating material, separated therefrom, and which face forward to the coating material spray jet.

Nachteilig bei Sprühgeräten mit Ringspalt als Formungsluftauslass ist, dass selbst dann, wenn der Spalt in Spaltlängsrichtung an mehreren Stellen zwischen den beiden ihn bildenden Teilen abgestützt ist, nicht gleichförmig groß ausgebildet werden kann, aus technischen Herstellungsgründen. Dieser Nachteil ist dann nicht gegeben, wenn anstatt eines Ringspaltes Bohrungen verwendet werden, insbesondere dann; wenn der Körper, in welchem die Bohrungen gebildet sind, an der Bohrungsstelle ungeteilt ist. Solche Sprühgeräte zeigen z. B. die EP 0 767 005 B1, EP 0 744 998 B1 und DE 34 31 785 C2.A disadvantage of sprayers with an annular gap as Formungsluftauslass is that even if the gap is supported in the gap longitudinal direction at several points between the two parts forming it, not uniformly large can be formed, for technical reasons. This disadvantage is not given if bores are used instead of an annular gap, especially then; when the body in which the holes are formed is undivided at the bore location. Such sprayers show z. EP 0 767 005 B1, EP 0 744 998 B1 and DE 34 31 785 C2.

Durch die Erfindung soll die Aufgabe gelöst werden, mit weniger Formungsluftmenge pro Zeiteinheit einen gleich guten oder besseren Wirkungsgrad bezüglich der Einwirkung auf den Beschichtungsmaterial-Sprühstrom und auch bezüglich der Beschichtungsqualität und bezüglich der zur Beschichtung erforderlichen Beschichtungsmaterialmenge zu erzielen.The object of the invention is to achieve the object of achieving an equally good or better efficiency with regard to the action on the coating material spray stream and also with regard to the coating quality and with respect to the amount of coating material required for the coating with less amount of shaping air per unit time.

Diese Aufgabe wird gemäß der Erfindung durch die Merkmale von Anspruch 1 gelöst.This object is achieved according to the invention by the features of claim 1.

Demgemäß betrifft die Erfindung ein Sprühgerät für Beschichtungsmaterial, insbesondere Beschichtungspulver, enthaltend einen Beschichtungsmaterialkanal; einen Sprühauslass am stromabwärtigen Ende des Beschichtungsmaterialkanals zum Sprühen des Beschichtungsmaterials auf ein zu beschichtendes Objekt; einen Formungsluftauslass für Formungs-Druckluft, welcher sich nahe bei dem Sprühauslass und dem Strömungsweg des Beschichtungsmaterials herum erstreckt, getrennt von dem Strömungsweg, und ausgebildet ist, um aus Druckluft einen den Beschichtungsmaterial-Sprühstrahl einhüllenden Formungsluftstrom zu erzeugen; wobei der Formungsluftauslass durch eine große Vielzahl von Löchern in einem Körper gebildet ist, welche um den Strömungsweg des Beschichtüngsmateriats, getrennt von diesem, herum verteilt angeordnet sind und nach vorne zum Beschichtungsmaterial-Sprühstrahl zeigen, dadurch gekennzeichnet, dass ein Umgebungsluftdurchgang mit Abstand relativ zu den Löchern radial nach innen versetzt vorgesehen ist, welcher sich von einer hinter dem Körper; in welchem die Löcher gebildet sind, gelegenen Umgebungsluft-Eintrittsstelle zu einer vor dem Körper, in welchem die Löcher gebildet sind, gelegenen Luftaustrittsstelle erstreckt und sich einteilig oder in Form von mehreren Öffnungen um den Strömungsweg des Beschichtungsmaterials, getrennt von diesem Strömühgsweg, herum erstreckt, so dass Umgebungsluft von der hinteren Lufteintrittsstelle zur vorderen Luftaustrittsstelle durch den Umgebungsluftdurchgang hindurch saugbar ist durch Strömungs-Saugwirkung des Beschichtungsmaterial-Sprühstrahls und/oder durch Strömungs-Saugwirkung des Formungsluftstromes.Accordingly, the invention relates to a spray device for coating material, in particular coating powder, comprising a coating material channel; a spray outlet at the downstream end of the coating material channel for spraying the coating material onto an object to be coated; a shaping air outlet for shaping compressed air, which extends close to the spray outlet and the flow path of the coating material, separated from the flow path, and is adapted to generate from compressed air a forming air flow enveloping the coating material spray jet; wherein the shaping air outlet is formed by a large plurality of holes in a body distributed around the flow path of the coating material, separate therefrom, and facing forwardly to the coating material spray, characterized in that an ambient air passage is spaced relative to Holes are provided offset radially inward, which extends from one behind the body; in which the holes are formed, located ambient air entry point to an air outlet located in front of the body in which the holes are formed and extending in one or more openings around the flow path of the coating material, separated from this Strömühgsweg, such that ambient air can be sucked from the rear air entry point to the front air exit point through the ambient air passage through flow suction of the coating material spray jet and / or through flow suction of the shaping air flow.

Weitere Merkmale der Erfindung sind in den unteransprüchen enthalten.Further features of the invention are contained in the dependent claims.

Die Erfindung wird im Folgenden mit Bezug auf die Zeichnungen anhand einer bevorzugten Ausführungsform als Beispiel beschrieben. In den Zeichnungen zeigen

Fig. 1
schematisch, unmaßstäblich und abgebrochen ein Sprühgerät nach der Erfindung,
Fig. 2
eine Vorderansicht des Sprühgerätes von Fig. 1 in Richtung von Pfeilen gesehen.
The invention will now be described by way of example with reference to the drawings of a preferred embodiment. In the drawings show
Fig. 1
schematically, not to scale and broken off a spray device according to the invention,
Fig. 2
a front view of the sprayer of Fig. 1 seen in the direction of arrows.

Die Fig. 1 und 2 zeigen nur eine von vielen möglichen Ausführungsformen der Erfindung.Figs. 1 and 2 show only one of many possible embodiments of the invention.

Das in den Fig. 1 und 2 dargestellte Sprühgerät ist zum Sprühen von Beschichtungspulver ausgebildet, könnte jedoch statt dessen auch zum Sprühen von flüssigem Beschichtungsmaterial ausgebildet sein.The spraying apparatus shown in FIGS. 1 and 2 is designed for spraying coating powder, but instead could also be designed for spraying liquid coating material.

Das Sprühgerät enthält einen Beschichtungsmaterialkanal 2; einen Sprühauslass 4 am stromabwärtigen Ende des Beschichtungsmaterialkanals 2 zum Sprühen des Beschichtungsmaterials 6 in Form eines Beschichtungsmaterial-Sprühstromes 8 auf ein zu beschichtendes Objekt (nicht gezeigt); und einen Formungsluftauslass 10 für Formungs-Druckluft 12, welcher sich nahe bei dem Sprühauslass 8 um den Strömungsweg des Beschichtungsmaterials 6, getrennt vom Strömungsweg, herum erstreckt und ausgebildet ist, um aus der Formungs-Druckluft 12 einen den Beschichtungsmaterial-Sprühstrahl 8 einhüllenden Formungsluftstrom 11 zu erzeugen.The sprayer includes a coating material channel 2; a spray outlet 4 at the downstream end of the coating material channel 2 for spraying the coating material 6 in the form of a coating material spray stream 8 onto an object to be coated (not shown); and a shaping air outlet 10 for shaping compressed air 12, which extends around the flow path of the coating material 6, separated from the flow path, close to the spray outlet 8 and is adapted to receive from the shaping compressed air 12 a Coating material spray 8 enveloping shaping air flow 11 to produce.

Der Formungsluftauslass 10 ist durch eine große Vielzahl von Löchern 14 gebildet, die sich durch einen an den Löchern ungeteilten Körper 16 erstrecken und um den Strömungsweg des Beschichtungsmaterials 6, getrennt von diesem Strömungsweg, herum verteilt angeordnet sind.The shaping air outlet 10 is formed by a large plurality of holes 14 which extend through a body 16 undivided at the holes and are distributed around the flow path of the coating material 6, separated from this flow path.

Bei der Ausführungsform der Fig. 1 und 2 sind die Löcher 14 jeweils mit gleichem Umfangsabstand 18 voneinander kreisförmig konzentrisch um die axiale Mittelachse 20 des Strömungsweges des Beschichtungsmaterials 6 herum angeordnet. Die Löcher können anstatt kreisförmig auch in anderer Form, beispielsweise oval oder mehreckig rahmenförmig, um die axiale Mittelachse 20 herum angeordnet sein, um eine bestimmte Querschnittsform des Sprühstromes 8 zu erzeugen.In the embodiment of Figs. 1 and 2, the holes 14 are each arranged with the same circumferential distance 18 from each other concentrically concentric around the axial center axis 20 of the flow path of the coating material 6 around. Instead of being circular, the holes may also be arranged in another form, for example oval or polygonal, around the central axial axis 20 in order to produce a specific cross-sectional shape of the spray stream 8.

Der Umfangsabstand 18 zwischen den Löchern 14 ist so klein, dass die aus ihnen austretenden Formungsluftstrahlen 22 durch radiale Expanison zu einem im Querschnitt ringförmigen Formungsluftstrom zusammenströmen, vorzugsweise unmittelbar nach den Löchern 14 noch bevor sie auf den Sprühstrom 8 auftreffen, spätestens jedoch am Auftreffpunkt auf den Sprühstrom 8.The circumferential distance 18 between the holes 14 is so small that the emerging from them forming air jets 22 flow together by radial Expanison to a circular cross-sectional shaping air flow, preferably immediately after the holes 14 before they hit the spray stream 8, but at the latest at the point of impact on the Spray stream 8.

Die Löcher 14 sind in Beschichtungsmaterial-Sprührichtung gesehen nach vorne gerichtet, vorzugsweise parallel zur axialen Mittelachse 20, und vorzugsweise in einer nach vorne zeigenden Stirnfläche gebildet. Gemäß anderer Ausführungsform können sie auch schräg zur axialen Mittelachse 20 gerichtet sein, entweder gegen sie oder von ihr weg zeigend. Durch die Richtung der Löcher 14 relativ zur axialen Mittelachse 20 und durch die Druckstärke der Druckluft 12 kann die Querschnittsform und Querschnittsgröße des Sprühstromes 8 eingestellt werden.The holes 14 are directed forward as viewed in the coating material spraying direction, preferably parallel to the axial center axis 20, and preferably formed in a forwardly facing end surface. According to another embodiment, they may also be directed obliquely to the axial central axis 20, pointing either towards or away from it. By the direction of the holes 14 relative to the axial center axis 20 and by the pressure strength of the compressed air 12, the cross-sectional shape and cross-sectional size of the spray stream 8 can be adjusted.

In oder nahe bei dem Strömungsweg des Beschichtungsmaterials ist am oder nahe bei dem Sprühauslass 4 mindestens eine oder mehrere Elektroden, z. B. 23, 24 und/oder 25 angeordnet, welche zur elektrostatischen Aufladung des Beschichtungsmaterials 6 an einen Hochspannungserzeuger 26 angeschlossen ist oder sind. Der Hochspannungserzeuger 26 kann extern von dem Sprühgerät oder gemäß Fig. 1 im Sprühgerät angeordnet sein. Er erzeugt aus einer Wechselspannung eine höhere Gteichspannung, welche beispielsweise im Bereich zwischen 4 kV und 150 kV liegen kann. Das Sprühgerät hat einen Niedervoltwechselspannungsanschluss 28 zur Zufuhr von Niederspannungswechselspannung an den Hochspannungserzeuger 26; einen Beschichtungsmaterialanschluss 30 zur Zufuhr von Beschichtungsmaterial zum Beschichtungsmaterialkanal 2; und einen Formungs-Druckluftanschluss 32 zur Zufuhr von Formungs-Drucktuft 12 zu einem Verteilerkanal 34, welcher die Löcher 14 auf ihrer stromaufwärtigen miteinander verbindet.At or near the flow path of the coating material is at or near the spray outlet 4 at least one or more electrodes, z. B. 23, 24 and / or 25, which is connected to a high voltage generator 26 for electrostatic charging of the coating material 6 or are. The high voltage generator 26 may be located externally of the sprayer or as shown in FIG. 1 in the sprayer. It generates from a AC voltage a higher Gteichspannung, which may for example be in the range between 4 kV and 150 kV. The sprayer has a low voltage AC voltage terminal 28 for supplying low voltage AC voltage to the high voltage generator 26; a coating material port 30 for supplying coating material to the coating material channel 2; and a molding compressed air port 32 for supplying molding compressed air 12 to a manifold 34 connecting the holes 14 at their upstream.

Es sind mindestens zehn oder mehr Löcher 14 vorhanden, beispielsweise mindestens zwanzig, dreißig oder vierzig oder jede beliebige Vielzahl. Der Umfangsabstand 18 der Löcher 14 voneinander ist mindestens um den Faktor zwei oder mehr größer als die Öffnungsgröße 38 der Löcher 14 in Umfangsrichtung um die axiale Mittelachse 20. Vorzugsweise hat jedoch der Faktor einen größeren Werft, beispielsweise den Wert fünf oder mehr, beispielswäise zehn oder mehr. Der Öffnungsquerschnitt von jedem Loch 14 ist kleiner als 2,0 mm2, beispielsweise kleiner als 1,0 mm2 oder noch bevorzugter kleiner als 0,5 mm2 oder kleiner als 0,3 mm2. Das Ziel ist es, die Löcher so klein wie möglich zu machen, wie dies technisch praktikabel ist, um dadurch mit einer kleinstmöglichen Formungsluft-Strömungsmenge pro Zeiteinheit einen schnell strömenden, energiestarken Formungsluftstrahl 22 an jedem Loch 14 und daraus einen energiestarken Formungsluftstrom 11 zu erzeugen. Dadurch wird mit wenig Luftmenge pro Zeiteinheit eine wirksame Beeinflussung der Querschnittsform und Querschnittsgröße des Sprühstromes 8 erzielt. Durch die sehr kleine Querschnittsgröße der einzelnen Löcher 14 wird an allen Löchern eine gleiche Formungsluft-Strömungsmenge pro Zeiteinheit auch dann erzielt, wenn alle Löcher 14 gleich großen Querschnitt haben und der Verteilerkanal 34 auf seiner ganzen Länge eine gleich bleibende Querschnittsgröße hat. Die kleine Querschnittsgröße der Löcher 14 bewirkt eine gleichmäßige Luftdruckverteilung auf der gesamten Länge des Verteilerkanals 34. Die Summe der gesamten Querschnittsgrößen von allen Löchern 14 ist kleiner, z. B. nur halb so groß, als der Strömungsquersschnitt des Verteilerkanals 34.There are at least ten or more holes 14, for example at least twenty, thirty or forty, or any plurality. The circumferential distance 18 of the holes 14 from each other is at least a factor of two or more greater than the opening size 38 of the holes 14 in the circumferential direction about the axial center axis 20. Preferably, however, the factor has a larger shipyard, for example, the value five or more, for example, ten or more. The opening area of each hole 14 is smaller than 2.0 mm 2 , for example, smaller than 1.0 mm 2 or more preferably smaller than 0.5 mm 2 or smaller than 0.3 mm 2 . The goal is to make the holes as small as possible, as is technically feasible, to thereby produce a fast flowing, high energy shaping air jet 22 at each hole 14 and therefrom a high energy shaping air stream 11 with a minimum possible forming air flow rate per unit time. As a result, an effective influencing of the cross-sectional shape and cross-sectional size of the spray stream 8 is achieved with a small amount of air per unit time. Due to the very small cross-sectional size of the individual holes 14, a same shaping air flow rate per unit time is achieved at all holes, even if all holes 14 have the same cross-section and the distribution channel 34 on its whole Length has a constant cross-sectional size. The small cross-sectional size of the holes 14 causes a uniform air pressure distribution over the entire length of the distribution channel 34. The sum of the total cross-sectional sizes of all holes 14 is smaller, z. B. only half as large as the cross-flow section of the distribution channel 34th

Die Löcher 14 haben vorzugsweise je einen im Querschnitt kreisrunden Querschnitt, können jedoch auch einen anderen Querschnitt haben, beispielsweise eine eckige Querschnittsform. Die Löcher 14 können beim Herstellen des Körpers 16, in welchem sie gebildet sind, während des Körper-Herstellungsprozesses geformt werden, beispielsweise durch Spritzgussverfahren zur Herstellung des Körpers 16 und gleichzeitiger Herstellung der Löcher 14. Gemäß einer anderen bevorzugten Ausführungsform sind die Löcher 14 durch Bohren in dem Körper 16 gebildet. Der Körper 16 kann aus einem steifen Material, beispielsweise aus einem Metallrohr oder aus einem Kunststoffrohr bestehen, oder aus einem elastischen oder flexiblen Material, z.B. einem Schlauch, z. B. aus Gummi oder Kunststoff.The holes 14 preferably each have a cross-sectionally circular cross-section, but may also have a different cross-section, for example a polygonal cross-sectional shape. The holes 14 may be formed during manufacture of the body 16 in which they are formed during the body fabrication process, for example by injection molding to make the body 16 and simultaneously make the holes 14. According to another preferred embodiment, the holes 14 are by drilling formed in the body 16. The body 16 may be made of a rigid material, such as a metal tube or a plastic tube, or of an elastic or flexible material, e.g. a hose, z. B. rubber or plastic.

Fig. 1 Und 2 zeigen eine Ausführungsform, bei welcher der Körper 16 ein Schlauch öder ein Rohr ist, in welchem die Löcher 14 gebohrt sind und dessen Schläuchinhehraum oder Rohrinnenraum den Verteilerkanal 34 bildet. Der Körper 16 kann ein Teil des Gehäuses 40 oder ein an diesem Gehäuse 40 des Sprühgerätes 2 befestigtes Gehäuseteil sein, oder gemäß den Fig. 1 und 2 ein zusätzlicher Körper 16. Dieser zusätzliche Körper 16 ist an dem Gehäuse 40 des Sprühgerätes befestigt, kann jedoch auch an einem anderen Element befestigt sein, welches an dem Gehäuse 40 befestigt ist, beispielsweise an einem vorderen Endstück 42, welches den Sprühauslass 4 bildet oder enthält und an dem Gehäuse 40 befestigt ist.Figs. 1 and 2 show an embodiment in which the body 16 is a hose or a pipe in which the holes 14 are drilled and whose hose chamber or interior forms the distribution channel 34. The body 16 may be a part of the housing 40 or a housing part attached to this housing 40 of the sprayer 2, or an additional body 16 as shown in FIGS. 1 and 2. This additional body 16 is attached to the housing 40 of the sprayer but may Also attached to another member which is fixed to the housing 40, for example, on a front end piece 42 which forms the spray or 4 and is attached to the housing 40.

Gemäß der bevorzugten Ausführungsform ist das Auslassende der Löcher 14 relativ zum Sprühauslass 4 stromaufwärts zurück versetzt. Gemäß anderer Ausführungsform könnte jedoch das Auslassende der Löcher 14 in der gleichen Querebene oder stromabwärts der Querebene liegen, in welcher auch der Sprühauslass 4 liegt. Wesentlich ist, dass der Formungsluftstrom 11 den Sprühstrom 8 so nähe am Sprühauslass 4 einhüllt, dass keine Beschichtungsmäteriatpartiket aus dem Beschichtungsmateriätstrom radial nach außen oder nach hinten auf die Außenumfangsftachen des Sprühgerätes entweichen könnenAccording to the preferred embodiment, the outlet end of the holes 14 is offset upstream relative to the spray outlet 4. According to another embodiment, however, the outlet end of the holes 14 could lie in the same transverse plane or downstream of the transverse plane, in which also the Spray outlet 4 is located. It is essential that the shaping air stream 11 envelops the spray stream 8 so close to the spray outlet 4 that no coating material particles can escape from the coating material stream radially outwards or backwards onto the outer peripheral areas of the spray device

Die Löcher 14 können mit wesentlich größerer Genauigkeit in einer vorbestimmten Größe hergestellt werden als sich in Umfangsrichtung um die axiale Mittelachse 20 erstreckende Spalte. Ferner besteht bei den Löchern weniger die Gefahr von Größenveränderungen durch Temperatureinflüsse und durch externe mechanische Einflüsse, beispielsweise Schläge durch Auftreffen auf andere Gegenstände.The holes 14 can be made to a predetermined size with much greater accuracy than gaps extending circumferentially about the axial center axis 20. Furthermore, fewer holes pose the risk of dimensional changes due to temperature effects and external mechanical influences, for example impacts due to impacts on other objects.

Der Körper 16, welcher mit den Löchern 14 versehen ist, ist durch ein oder mehrere Elemente 44, vorzugsweise Stege mit Zwischenräumen zwischen ihnen, direkt oder über Zwischenelemente an dem Gehäuse 40 befestigt, so dass der Körper 16 von dem Gehäuse 40 getragen wird.The body 16, which is provided with the holes 14, is secured to the housing 40 by one or more members 44, preferably webs with gaps between them, such that the body 16 is supported by the housing 40 directly or via intermediate members.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist ein Umgebungsluftdurchgäng 50 mit Abstand relativ zu den Löchern 14 radial nach innen versetzt vorgesehen, weicher sich von einer hinter dem Körper 16, welcher die Löcher 14 hat, erstreckenden Umgebungsluft-Eintrittsstelle 52 zu einer vor dem Körper 16 gelegenen Luftaustrittsstelle 54 erstreckt und welcher sich in Form eines oder mehrerer Schlitze oder anderen Öffnungen um den Strömungsweg des Beschichtungsmaterials 6, getrennt von diesem Strömungsweg, und damit auch um die axiale Mittelachse 20 herum erstreckt, so dass Umgebungsluft 56 von der hinteren Lufteintrittsstelle 52 zur vorderen Luftaustrittsstelle 54 durch den Umgebungsluftdurchgang 50 hindurchsaugbar ist durch die Saugwirkung des Beschichtungsmaterial-Sprühstromes 8 und/oder durch die Saugwirkung der Formungs-Druckluftstrahlen 22 und des Formungsluftstromes 11. Dieser Umgebungsluftdurchgang 50 verhindert ein Zurückströmen von Beschichtungsmaterialpartikeln auf die Außenflächen des Sprühgerätes und dessen Körper 16, der die Löcher 14 enthält. Damit wird eine Verschmutzung dieser Teile verhindert.According to a preferred embodiment of the invention, an ambient air passageway 50 is provided spaced radially inwardly relative to the holes 14, which deviates from an ambient air entry point 52 extending beyond the body 16 having the holes 14 to a front of the body 16 Air outlet 54 extends and which extends in the form of one or more slots or other openings around the flow path of the coating material 6, separated from this flow path, and thus around the axial center axis 20 around, so that ambient air 56 from the rear air inlet point 52 to the front air outlet point 54 is sucked through the ambient air passage 50 by the suction effect of the coating material spray stream 8 and / or by the suction effect of the shaping compressed air jets 22 and the shaping air stream 11. This ambient air passage 50 prevents backflow of coating material particle On the outer surfaces of the sprayer and its Body 16 containing the holes 14. This prevents contamination of these parts.

Bei der gezeigten Ausführungsform haben alle Löcher 14 durch den Druckluft-Verteilerkanal 34 mit einer Druckluft-Einlassöffnung 62 miteinander Strömungsverbindung. Gemäß einer nicht gezeigten Ausführungsform können zwei oder mehr Gruppen von solchen Löchern 14 durch einen Abschnitt des Verteilerkanals 34 miteinander Strömungsverbindung haben, wobei die Abschnitte strömungsmäßig voneinander getrennt sind und jeder Abschnitt eine eigene Druckluft-Einlässöffnung 62 hat. Dies ermöglicht eine feinere Einstellung der aus den Löchern 14 austretenden Druckluftmenge pro Zeiteinheit vorzugsweise dahingehend, dass aus allen Löchern die gleiche Druckluftmenge pro Zeiteinheit ausströmt, oder gemäß anderer Ausführungsform definierte unterschiedliche Druckluftmengen pro Zeiteinheit ausströmen.In the embodiment shown, all the holes 14 have fluid communication with each other through the compressed air distribution channel 34 with a compressed air inlet port 62. According to an embodiment not shown, two or more groups of such holes 14 may be in fluid communication with each other through a portion of the distribution channel 34, the portions being fluidly separated from one another and each portion having its own compressed air inlet port 62. This allows a finer adjustment of the amount of compressed air emerging from the holes 14 per unit of time, preferably in that the same amount of compressed air flows out of all the holes per unit of time, or according to another embodiment, different amounts of compressed air flow out per unit of time.

Für beide Ausführungsformen sind der Öffnungsquerschnitt des Verteilerkanals 34 (oder dessen voneinander getrennte Abschnitte) und die Öffnungsquerschnitte der Löcher 14 derart aufeinander abgestimmt, dass aus allen Löchern 14 die gleiche Druckluftmenge pro Zeiteinheit ausströmen kann. Die aus den Löchern 14 austretende Druckluftmenge pro Zeiteinheit ist abhängig vom Strömungwiderstand im Verteilerkanal 34 zwischen der Einlassöffnung 62 und dem betreffenden Loch 14. Eine gleiche Druckluftmenge pro Zeiteinheit kann an allen Löchern 14 dadurch erreicht werden, dass entweder der Verteilerkanal 34 in Richtung vom nächstgelegenen Loch 14 bis zum entferntes gelegenen Loch 14 einen zunehmend kleineren Widerstand hat oder vorzugsweise dadurch, dass die Löcher mit zunehmender Abstand von der Druckluft-Einlassöffnung 62 einen zunehmend größeren Öffnungsquerschnitt haben. Hierbei hat das Loch 14, welches den kürzesten Strömungsweg von der Einlassöffnung 62 entfernt ist, den kleinsten Öffnungsquerschnitt, und das am weitesten entfernte Loch 14 den größten Öffnungsquerschnitt. Solche Maßnahmen sind jedoch technisch aufwändig und teuer. Sie können auch bei der Erfindung verwendet werden. Jedoch sind bei der Erfindung die Öffnungsquerschnitte in der genannten Weise so klein, dass auch ohne solche Maßnahmen an allen Löchern 14 eine gleich große Formungsluft-Strömungsmenge pro Zeiteinheit erzielt wird.For both embodiments, the opening cross-section of the distribution channel 34 (or its separate sections) and the opening cross-sections of the holes 14 are coordinated so that from all holes 14, the same amount of compressed air per unit time can flow. The amount of compressed air exiting the holes 14 per unit time is dependent on the flow resistance in the distribution channel 34 between the inlet port 62 and the respective hole 14. An equal amount of compressed air per unit time can be achieved at all holes 14 in that either the distribution channel 34 in the direction of the nearest hole 14 to the remote hole 14 has an increasingly smaller resistance or preferably in that the holes have an increasingly larger opening cross-section with increasing distance from the compressed air inlet opening 62. Here, the hole 14, which is the shortest flow path from the inlet opening 62, the smallest opening cross-section, and the farthest hole 14 has the largest opening cross-section. However, such measures are technically complex and expensive. They can also be used in the invention. However, at the Invention the opening cross-sections in the manner mentioned so small that even without such measures on all holes 14 an equal shaping air flow rate per unit time is achieved.

Alle Ausführungsformen der Erfindung eignen sich für alle Arten von Sprühgeräten für Beschichtungsmaterial, insbesondere für pulverförmiges Beschichtungsmaterial, beispielsweise für Sprühgeräte mit einem Sprühauslass in Form einer Rundstrahldüse oder Flachstrahldüse, mit zylindrischer oder trichterartiger Form, mit oder ohne Prallkörper 60 oder Staukörper, und auch für Sprühgeräte, deren Sprühauslass 4 mit einem Rotationskörper versehen oder durch einen solchen gebildet ist. Ferner eignet sich die Erfindung auch für Corona-Sprühgeräte, bei welchen an der mindestens einen Hochspannungselektrode 23, 24, 25 Coronaentladungen erzeugt werden, und auch für sogenannte Tribo-Sprühgeräte, bei welchen die elektrostatische Aufladung der Sprühbeschichtungsmaterialpartikel durch Reibung derselben im Beschichtungsmaterialkanal 2 erzeugt wird.All embodiments of the invention are suitable for all types of sprayers for coating material, in particular for powdery coating material, for example for sprayers with a spray outlet in the form of a round jet nozzle or flat jet nozzle, with cylindrical or funnel-like shape, with or without baffle body 60 or bluff body, and also for sprayers whose spray outlet 4 is provided with or formed by a rotary body. Furthermore, the invention is also suitable for corona spray devices, in which corona discharges are generated at the at least one high-voltage electrode 23, 24, 25, and also for so-called tribo-spraying devices, in which the electrostatic charge of the spray coating material particles is generated in the coating material channel 2 by friction ,

Die Erfindung ermöglicht eine homogene Luftverteilung dei Formungs-Druckluft zum den Sprühstrom 8 herum. Hierfür wird nur eine kleine Druckluftmenge pro Zeiteinheit benötigt. Der gemäß der Erfindung erzeugte Formungsluftstrom 11 hat eine stabilisierende Wirkung auf den Sprühstrom 8, welcher eher die Form einer Sprühwolke als eines Sprühstrahles hat. Dieser Sprühstrom 8 bzw. Sprühwolke ist wesentlich unsensibler bezüglich Luftströmungen in einer Beschichtungskabine als beim Stand der Technik. Dies hat den weiteren Vorteil, dass der Auftragswirkungsgrad des Beschichtungspulvers auf ein zu beschichtendes Objekt und die Beschichtungsqualität, z. B. Bechichtungsgleichmäßigkeit, wesentlich erhöht werden.The invention enables a homogeneous air distribution of the shaping compressed air to the spray stream 8 around. For this purpose, only a small amount of compressed air per unit of time is needed. The shaping air stream 11 produced according to the invention has a stabilizing effect on the spray stream 8, which has the shape of a spray cloud rather than a spray jet. This spray stream 8 or spray cloud is significantly less sensitive to air currents in a coating booth than in the prior art. This has the further advantage that the order efficiency of the coating powder on an object to be coated and the coating quality, eg. B. Bechichtungsgleichmäßigkeit be substantially increased.

Sprühgeräte dieser Art werden üblicherweise als Spray Gun oder Sprühpistole bezeichnet, sowohl wenn sie mit einem Handgriff zur manuellen Bedienung versehen sind, als auch wenn sie als gerade oder winkelförmige Automatikpistolen ausgebildet sind, welche von einer Vorrichtuhg gehalten werden, z. B. von einem Roboter, Hubständer oder ortsfesten Träger.Sprayers of this type are commonly referred to as a spray gun or spray gun, both when provided with a handle for manual operation, as well as when they are straight or angular automatic guns are formed, which are held by a Vorrichtuhg, z. B. from a robot, Hubständer or stationary carrier.

Claims (10)

  1. Spray device for coating material (6), in particular coating powder, comprising a coating material channel (2); a spray outlet (4) at the downstream end of the coating material channel (2) for spraying the coating material (6) onto an object to be coated; an air outlet (10), which extends close to the spray outlet (4) around the flow path of the coating material (6), separate from the flow path, and is formed to produce an air stream (11) from compressed air; the air outlet (10) being formed by a large number of holes (14) in a body (16), which are arranged distributed around the flow path of the coating material (6), separate from the latter, and point forwards towards the coating material spray jet (8); an ambient air passage (50) being provided offset radially inwards by a distance in relation to the holes (14), which passage extends from an ambient air inlet point (52), situated behind the body (16) in which the holes (14) are formed, to an air outlet point (54), situated in front of the body (16) in which the holes (14) are formed, and extends in one part or in the form of a number of openings around the flow path of the coating material (6), separate from this flow path, so that ambient air (56) can be sucked from the rear air inlet point (52) to the front air outlet point (54) through the ambient air passage (50) by flow suction action of the coating material spray jet (8) and/or by flow suction action of the air stream (11), characterized in that the air outlet (10) is formed as a forming air outlet for compressed forming air, in order to produce the air stream (11) from compressed air in the form of a forming air stream (11) enveloping the coating material spray jet (8); and in that at least one electrode (23, 24, 25) is arranged in the flow path of the coating material at or close to the spray outlet (4), which electrode is connected or can be connected to a high-voltage generator (26) for the electrostatic charging of the coating material (6).
  2. Spray device according to Claim 1, characterized in that the body (16) is undivided at the holes (14).
  3. Spray device according to Claim 1 or 2, characterized in that at least ten or more of the holes (14) are provided.
  4. Spray device according to at least one of the preceding claims, characterized in that the distance (18) of the holes (14) from one another, seen in the circumferential direction around the flow path of the coating material (6), is greater by a factor of five or more, preferably at least ten, than the size of the opening of the holes (14) in this circumferential direction.
  5. Spray device according to at least one of the preceding claims, characterized in that the opening cross section of each hole (14) is less than 2.0 mm2, preferably less than 1.0 mm2, or, with still greater preference, less than 0.5 mm2 or less than 0.3 mm2.
  6. Spray device according to at least one of the preceding claims, characterized in that the holes (14) have a circular cross section.
  7. Spray device according to at least one of the preceding claims, characterized in that the body (16) is a tube or a pipe which surrounds the flow path of the coating material (6), separate from it, and in that the holes (14) are formed in the wall of the tube or the pipe.
  8. Spray device according to at least one of the preceding claims, characterized in that the outlet end of the holes (14) is arranged offset back in the upstream direction in relation to the spray outlet (4).
  9. Spray device according to at least one of the preceding claims, characterized in that all the holes (14) or groups of holes (14) are each in flow communication with a compressed air distributor channel (34), which has at least one compressed air inlet opening (62).
  10. Spray device according to Claim 9, characterized in that the opening cross section of the distributor channel (34) and the opening cross sections of the holes (14) are made to match one another in such a way that the same amount of compressed air per unit of time can flow out from all the holes (14).
EP04007899A 2003-05-05 2004-04-01 Powder spray coating device Expired - Lifetime EP1475159B1 (en)

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DE10319916A DE10319916A1 (en) 2003-05-05 2003-05-05 Spraying device for coating material, in particular coating powder

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KR (1) KR100636003B1 (en)
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TWI278353B (en) 2007-04-11
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DE502004001303D1 (en) 2006-10-12
ES2271728T3 (en) 2007-04-16
US7478763B2 (en) 2009-01-20
KR100636003B1 (en) 2006-10-18
PT1475159E (en) 2007-01-31
AU2004201870B2 (en) 2005-10-13
KR20040095160A (en) 2004-11-12
CA2466245C (en) 2008-04-22
DE10319916A1 (en) 2004-11-25
AU2004201870A1 (en) 2004-11-25
JP2004330190A (en) 2004-11-25
CA2466245A1 (en) 2004-11-05
US20050001061A1 (en) 2005-01-06
NZ532761A (en) 2004-12-24
ATE337857T1 (en) 2006-09-15
CN1572376A (en) 2005-02-02

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