EP1475159A1 - Powder spray coating device - Google Patents

Powder spray coating device Download PDF

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Publication number
EP1475159A1
EP1475159A1 EP04007899A EP04007899A EP1475159A1 EP 1475159 A1 EP1475159 A1 EP 1475159A1 EP 04007899 A EP04007899 A EP 04007899A EP 04007899 A EP04007899 A EP 04007899A EP 1475159 A1 EP1475159 A1 EP 1475159A1
Authority
EP
European Patent Office
Prior art keywords
holes
coating material
spraying device
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.)
Granted
Application number
EP04007899A
Other languages
German (de)
French (fr)
Other versions
EP1475159B1 (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
Application filed by Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP1475159A1 publication Critical patent/EP1475159A1/en
Application granted granted Critical
Publication of EP1475159B1 publication Critical patent/EP1475159B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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 Has coating material.
  • a spray device which has at least one High voltage electrode for electrostatically charging the Has coating material.
  • it can also be used for sprayers, which are not designed for the electrostatic charging of coating material are.
  • Sprayers of this type are known, e.g. B. 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.
  • a disadvantage of sprayers with an annular gap as a shaping air outlet is that itself then when the gap in the longitudinal direction of the gap at several points between the is supported both parts forming it, not uniformly large can be, for technical manufacturing reasons. Then this disadvantage is not given if holes are used instead of an annular gap, especially when the body in which the bores are formed is on the drilling site is undivided.
  • Such sprayers show e.g. B. EP 0 767 005 B1, EP 0 744 998 B1 and DE 34 31 785 C2.
  • the object of the invention is to be achieved with less amount of shaping air per unit of time an equally good or better efficiency in terms of Effect on the coating material spray stream and also in relation to the Coating quality and with regard to the coating required To achieve the amount of coating material.
  • the invention relates to a spraying device for coating material, in particular coating powder containing 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; one Shaping air outlet for shaping compressed air, which is close to the Spray outlet and the flow path of the coating material extends around separated from the flow path, and is designed to one of the compressed air To generate coating air spray enveloping molding air flow; the shaping air outlet through a large plurality of holes in one Body is formed, which around the flow path of the coating material, separated from this, arranged around and forward to the Show coating material spray jet, characterized in that a Ambient air passage spaced radially inward relative to the holes is provided offset, which is from a behind the body in which the Holes are formed, located in front of the ambient air entry point Body, in which the holes are formed, located air outlet point and in one piece or in the form of several openings around the flow path of the Coating material, separated from this flow path, extends around that ambient air from the
  • the spray device shown in Figs. 1 and 2 is for spraying Coating powder formed, but could instead for spraying liquid coating material.
  • the sprayer contains 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 an object to be coated (not shown); and a shaping air outlet 10 for Forming compressed air 12, which is close to the spray outlet 8 Flow path of the coating material 6, separated from the flow path extends and is configured to form one of the compressed air 12 Coating material spray 8 enveloping forming air flow 11 produce.
  • the shaping air outlet 10 is formed by a large number of holes 14, which extend through an undivided body 16 at the holes and around the Flow path of the coating material 6, separate from this flow path, are distributed around.
  • the holes 14 are each the same Circumferential distance 18 from each other circularly concentric about the axial central axis 20 of the flow path of the coating material 6 arranged around.
  • the circumferential distance 18 between the holes 14 is so small that they are out of them escaping shaping air jets 22 by radial expansion into an im Cross-section annular flow of shaping air flow together, preferably immediately after the holes 14 even before they hit the spray stream 8, at the latest, however, at the point of impact on the spray stream 8.
  • the holes 14 are forwards in the coating material spray direction directed, preferably parallel to the axial central axis 20, and preferably in an end face pointing forward. According to another embodiment they can also be directed obliquely to the axial central axis 20, either against pointing her or away from her. By the direction of the holes 14 relative to the axial The central axis 20 and the pressure strength of the compressed air 12 can Cross-sectional shape and cross-sectional size of the spray stream 8 can be set.
  • At least one or more electrodes, z. B. 23, 24 and / or 25 arranged for electrostatic charging of the Coating material 6 is connected to a high voltage generator 26 or are.
  • the high voltage generator 26 can be external to the sprayer or 1 in the sprayer. He creates from one AC voltage a higher DC voltage, for example in the range can be between 4 kV and 150 kV.
  • the sprayer has one Low-voltage AC voltage connection 28 for the supply of Low-voltage alternating voltage to the high-voltage generator 26; one Coating material connection 30 for supplying coating material to the Coating material channel 2; and a molding air port 32 for Supply of molding compressed air 12 to a manifold 34 which has the holes 14 connects on their upstream.
  • each hole 14 there are at least ten or more holes 14, for example at least twenty, thirty or forty, or any number.
  • the circumferential distance 18 of the holes 14 from one another is at least a factor of two or more than the opening size 38 of the holes 14 in the circumferential direction around the axial central axis 20.
  • the factor preferably has a larger value, for example the value five or more, for example ten or more.
  • the opening cross section of each hole 14 is less than 2.0 mm 2 , for example less than 1.0 mm 2 or more preferably less than 0.5 mm 2 or less than 0.3 mm 2 .
  • the aim is to make the holes as small as possible, as is technically practical, in order to thereby generate a fast-flowing, high-energy shaping air jet 22 at each hole 14 with the smallest possible amount of shaping air flow per unit time, and from this an energetic shaping air stream 11.
  • an effective influence on 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, an equal amount of shaping air flow per unit of time is achieved at all holes even if all holes 14 have the same cross-section and the distribution channel 34 has a constant cross-sectional size over its entire length.
  • the small cross-sectional size of the holes 14 results in an even distribution of air pressure over the entire length of the distributor channel 34.
  • the sum of the total cross-sectional sizes of all holes 14 is smaller, e.g. B. only half as large as the flow cross section of the distribution channel 34.
  • the holes 14 preferably each have a cross section which is circular in cross section, can also have a different cross-section, for example an angular one Cross-sectional shape.
  • the holes 14 can in the manufacture of the body 16, in which they are formed during the body manufacturing process are, for example by injection molding processes for the production of the body 16 and simultaneously making the holes 14. According to another preferred In the embodiment, the holes 14 are formed in the body 16 by drilling.
  • the Body 16 may be made of a rigid material, such as a metal tube or consist of a plastic tube, or of an elastic or flexible Material, e.g. B. a hose, e.g. B. made of rubber or plastic.
  • FIGS. 1 and 2 show an embodiment in which the body 16 is a hose or is a pipe in which the holes 14 are drilled and the like Hose interior or tube interior forms the distribution channel 34.
  • the body 16 can be a part of the housing 40 or a part of the housing 40 of the spray device 2 be attached housing part, or according to FIGS. 1 and 2, an additional body 16.
  • This additional body 16 is attached to the housing 40 of the sprayer, can, however, also be attached to another element which is attached to the Housing 40 is attached, for example on a front end piece 42, which forms or contains the spray outlet 4 and is attached to the housing 40.
  • the outlet end of holes 14 is relative moved back to the spray outlet 4 upstream.
  • the embodiment could have the outlet end of holes 14 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 flow 11 is the spray flow 8 so close to the spray outlet 4 that no coating material particles the coating material flow radially outwards or backwards on the Outer peripheral surfaces of the sprayer can escape.
  • the holes 14 can be done with much greater accuracy in a predetermined Size can be produced as in the circumferential direction around the axial central axis 20 extending column. Furthermore, there is less of a risk of holes Changes in size due to temperature influences and external mechanical Influences, for example blows from hitting other objects.
  • the body 16, which is provided with the holes 14, is through one or more Elements 44, preferably webs with spaces between them, directly or attached to the housing 40 via intermediate elements, so that the body 16 of the housing 40 is worn.
  • a Ambient air passage 50 radially spaced relative to the holes 14 provided offset inside, which is from a behind the body 16, which the Has holes 14, ambient air entry point 52 extending to a front of the Body 16 located air outlet 54 and which extends in the form of a , or multiple slots or other openings around the flow path of the Coating material 6, separate from this flow path, and thus around the axial central axis 20 extends around, so that ambient air 56 from the rear air inlet point 52 to the front air outlet point 54 through the Ambient air passage 50 can be sucked through by the suction effect of the Coating material spray stream 8 and / or by the suction of Shaping compressed air jets 22 and the shaping air flow 11.
  • This Ambient air passage 50 prevents backflow of Coating material particles on the outer surfaces of the sprayer and its Body 16 containing holes 14. This will contaminate these parts prevented.
  • all holes 14 have through the compressed air distribution channel 34 with a compressed air inlet opening 62 with one another Flow connection.
  • two or more groups of such holes 14 through a portion of the Distribution channel 34 have flow communication with each other, the sections are separated from each other in terms of flow and each section has its own Compressed air inlet opening 62 has. This enables a finer adjustment of the from Holes 14 exiting amount of compressed air per unit of time preferably in that the same amount of compressed air per unit time from all holes flows out, or according to another embodiment defined different Flow out compressed air quantities 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 matched to one another in such a way that all holes 14 are the same Compressed air volume can flow out per time unit.
  • the holes 14 The amount of compressed air escaping per unit of time depends on the flow resistance in the distribution channel 34 between the inlet opening 62 and the relevant hole 14.
  • An equal amount of compressed air per unit time can be achieved in all holes 14 can be achieved that either the distribution channel 34 in the direction of nearest hole 14 to the distant hole 14 an increasing has smaller resistance or preferably in that the holes with increasing distance from the compressed air inlet opening 62 an increasing have a larger opening cross-section.
  • the hole 14 which the shortest flow path from the inlet opening 62 is the smallest Opening cross-section, and the most distant hole 14 the largest Opening cross section.
  • such measures are technically complex and expensive. They can also be used in the invention.
  • the Invention the opening cross-sections in the manner mentioned so small that too without such measures, an equal amount of shaping air flow at all holes 14 is achieved per unit of time.
  • All embodiments of the invention are suitable for all types of sprayers for coating material, in particular for powder coating material, for example for sprayers with a spray outlet in the form of a Round jet or flat jet, with cylindrical or funnel-like shape, with or without impact body 60 or baffle, and also for sprayers whose Spray outlet 4 provided with a rotary body or by such is formed.
  • the invention is also suitable for corona sprayers at which on the at least one high-voltage electrode 23, 24, 25 Corona discharges are generated, and also for so-called tribo-sprayers, in which the electrostatic charge of the spray coating material particles is generated by friction thereof in the coating material channel 2.
  • the invention enables a homogeneous air distribution of the forming compressed air the spray stream 8 around. For this, only a small amount of compressed air per unit of time needed.
  • the shaping air flow 11 generated according to the invention has one stabilizing effect on the spray stream 8, which is more in the form of a Spray cloud as a spray has.
  • This spray stream is 8 or spray cloud much less sensitive to air currents in a coating booth than in the state of the art. This has the further advantage that the Application efficiency of the coating powder on an object to be coated and the coating quality, e.g. B. coating uniformity, significantly increased become.
  • Sprayers of this type are commonly used as a spray gun or spray gun referred to, both with a handle for manual operation are provided, as well as when they are as straight or angular automatic pistols are formed, which are held by a device, for. B. from one Robot; Lifting stand or fixed carrier.

Landscapes

  • 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 Has coating material. However, it can also be used for sprayers, which are not designed for the electrostatic charging of coating material are.

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, e.g. B. 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.

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 a shaping air outlet is that itself then when the gap in the longitudinal direction of the gap at several points between the is supported both parts forming it, not uniformly large can be, for technical manufacturing reasons. Then this disadvantage is not given if holes are used instead of an annular gap, especially when the body in which the bores are formed is on the drilling site is undivided. Such sprayers show e.g. B. 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 be achieved with less amount of shaping air per unit of time an equally good or better efficiency in terms of Effect on the coating material spray stream and also in relation to the Coating quality and with regard to the coating required To achieve the amount of coating material.

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 solved.

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 Beschichtungsmaterials, 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 Strömungsweg, 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 spraying device for coating material, in particular coating powder containing 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; one Shaping air outlet for shaping compressed air, which is close to the Spray outlet and the flow path of the coating material extends around separated from the flow path, and is designed to one of the compressed air To generate coating air spray enveloping molding air flow; the shaping air outlet through a large plurality of holes in one Body is formed, which around the flow path of the coating material, separated from this, arranged around and forward to the Show coating material spray jet, characterized in that a Ambient air passage spaced radially inward relative to the holes is provided offset, which is from a behind the body in which the Holes are formed, located in front of the ambient air entry point Body, in which the holes are formed, located air outlet point and in one piece or in the form of several openings around the flow path of the Coating material, separated from this flow path, extends around that ambient air from the rear air entry point to the front Air outlet point is suckable through the ambient air passage Flow suction effect of the coating material spray jet and / or through Flow suction effect of the shaping air flow.

Weitere Merkmale der Erfindung sind in den Unteransprüchen enthalten.Further features of the invention are contained in the subclaims.

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 II gesehen.
The invention is described below with reference to the drawings using a preferred embodiment as an example. Show in the drawings
Fig. 1
schematically, to scale and broken a sprayer according to the invention,
Fig. 2
a front view of the sprayer of FIG. 1 seen in the direction of arrows II.

Die Fig. 1 und 2 zeigen nur eine von vielen möglichen Ausführungsformen der Erfindung.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 spray device shown in Figs. 1 and 2 is for spraying Coating powder formed, but could instead 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 contains 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 an object to be coated (not shown); and a shaping air outlet 10 for Forming compressed air 12, which is close to the spray outlet 8 Flow path of the coating material 6, separated from the flow path extends and is configured to form one of the compressed air 12 Coating material spray 8 enveloping forming air flow 11 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 number of holes 14, which extend through an undivided body 16 at the holes and around the Flow path of the coating material 6, separate from this flow path, are distributed around.

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 the same Circumferential distance 18 from each other circularly concentric about the axial central axis 20 of the flow path of the coating material 6 arranged around. The Instead of being circular, holes can also have another shape, for example oval or polygonal frame-shaped to be arranged around the axial central axis 20 to generate a certain 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 they are out of them escaping shaping air jets 22 by radial expansion into an im Cross-section annular flow of shaping air flow together, preferably immediately after the holes 14 even before they hit the spray stream 8, at the latest, however, 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 forwards in the coating material spray direction directed, preferably parallel to the axial central axis 20, and preferably in an end face pointing forward. According to another embodiment they can also be directed obliquely to the axial central axis 20, either against pointing her or away from her. By the direction of the holes 14 relative to the axial The central axis 20 and the pressure strength of the compressed air 12 can Cross-sectional shape and cross-sectional size of the spray stream 8 can be set.

In oder nahe bei dem Strömungsweg des Beschichtungsmaterials ist am oder nahe bei dem Sprühauslass 4 vorzugsweise 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 Gleichspannung, 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-Druckluft 12 zu einem Verteilerkanal 34, welcher die Löcher 14 auf ihrer stromaufwärtigen miteinander verbindet.In or near the flow path of the coating material is on or near at the spray outlet 4 preferably at least one or more electrodes, z. B. 23, 24 and / or 25 arranged for electrostatic charging of the Coating material 6 is connected to a high voltage generator 26 or are. The high voltage generator 26 can be external to the sprayer or 1 in the sprayer. He creates from one AC voltage a higher DC voltage, for example in the range can be between 4 kV and 150 kV. The sprayer has one Low-voltage AC voltage connection 28 for the supply of Low-voltage alternating voltage to the high-voltage generator 26; one Coating material connection 30 for supplying coating material to the Coating material channel 2; and a molding air port 32 for Supply of molding compressed air 12 to a manifold 34 which has the holes 14 connects on 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 Wert, beispielsweise den Wert fünf oder mehr, beispielsweise 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 number. The circumferential distance 18 of the holes 14 from one another is at least a factor of two or more than the opening size 38 of the holes 14 in the circumferential direction around the axial central axis 20. However, the factor preferably has a larger value, for example the value five or more, for example ten or more. The opening cross section of each hole 14 is less than 2.0 mm 2 , for example less than 1.0 mm 2 or more preferably less than 0.5 mm 2 or less than 0.3 mm 2 . The aim is to make the holes as small as possible, as is technically practical, in order to thereby generate a fast-flowing, high-energy shaping air jet 22 at each hole 14 with the smallest possible amount of shaping air flow per unit time, and from this an energetic shaping air stream 11. As a result, an effective influence on 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, an equal amount of shaping air flow per unit of time is achieved at all holes even if all holes 14 have the same cross-section and the distribution channel 34 has a constant cross-sectional size over its entire length. The small cross-sectional size of the holes 14 results in an even distribution of air pressure over the entire length of the distributor channel 34. The sum of the total cross-sectional sizes of all holes 14 is smaller, e.g. B. only half as large as the flow cross section of the distribution channel 34.

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 section which is circular in cross section, can also have a different cross-section, for example an angular one Cross-sectional shape. The holes 14 can in the manufacture of the body 16, in which they are formed during the body manufacturing process are, for example by injection molding processes for the production of the body 16 and simultaneously making the holes 14. According to another preferred In the embodiment, the holes 14 are formed in the body 16 by drilling. The Body 16 may be made of a rigid material, such as a metal tube or consist of a plastic tube, or of an elastic or flexible Material, e.g. B. a hose, e.g. B. made of rubber or plastic.

Fig. 1 und 2 zeigen eine Ausführungsform, bei welcher der Körper 16 ein Schlauch oder ein Rohr ist, in welchem die Löcher 14 gebohrt sind und dessen Schlauchinnenraum 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.1 and 2 show an embodiment in which the body 16 is a hose or is a pipe in which the holes 14 are drilled and the like Hose interior or tube interior forms the distribution channel 34. The body 16 can be a part of the housing 40 or a part of the housing 40 of the spray device 2 be attached housing part, or according to FIGS. 1 and 2, an additional body 16. This additional body 16 is attached to the housing 40 of the sprayer, can, however, also be attached to another element which is attached to the Housing 40 is attached, for example on a front end piece 42, which forms or contains the spray outlet 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 nahe am Sprühauslass 4 einhüllt, dass keine Beschichtungsmaterialpartikel aus dem Beschichtungsmaterialstrom radial nach außen oder nach hinten auf die Außenumfangsflächen des Sprühgerätes entweichen können.In the preferred embodiment, the outlet end of holes 14 is relative moved back to the spray outlet 4 upstream. According to others However, the embodiment could have the outlet end of holes 14 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 flow 11 is the spray flow 8 so close to the spray outlet 4 that no coating material particles the coating material flow radially outwards or backwards on the Outer peripheral surfaces of the sprayer can escape.

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 done with much greater accuracy in a predetermined Size can be produced as in the circumferential direction around the axial central axis 20 extending column. Furthermore, there is less of a risk of holes Changes in size due to temperature influences and external mechanical Influences, for example blows from hitting 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 through one or more Elements 44, preferably webs with spaces between them, directly or attached to the housing 40 via intermediate elements, so that the body 16 of the housing 40 is worn.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist ein Umgebungsluftdurchgang 50 mit Abstand relativ zu den Löchern 14 radial nach innen versetzt vorgesehen, welcher 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, a Ambient air passage 50 radially spaced relative to the holes 14 provided offset inside, which is from a behind the body 16, which the Has holes 14, ambient air entry point 52 extending to a front of the Body 16 located air outlet 54 and which extends in the form of a , or multiple slots or other openings around the flow path of the Coating material 6, separate from this flow path, and thus around the axial central axis 20 extends around, so that ambient air 56 from the rear air inlet point 52 to the front air outlet point 54 through the Ambient air passage 50 can be sucked through by the suction effect of the Coating material spray stream 8 and / or by the suction of Shaping compressed air jets 22 and the shaping air flow 11. This Ambient air passage 50 prevents backflow of Coating material particles on the outer surfaces of the sprayer and its Body 16 containing holes 14. This will contaminate these parts prevented.

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-Einlassöffnung 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 holes 14 have through the compressed air distribution channel 34 with a compressed air inlet opening 62 with one another Flow connection. According to an embodiment not shown, two or more groups of such holes 14 through a portion of the Distribution channel 34 have flow communication with each other, the sections are separated from each other in terms of flow and each section has its own Compressed air inlet opening 62 has. This enables a finer adjustment of the from Holes 14 exiting amount of compressed air per unit of time preferably in that the same amount of compressed air per unit time from all holes flows out, or according to another embodiment defined different Flow out compressed air quantities 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 matched to one another in such a way that all holes 14 are the same Compressed air volume can flow out per time unit. The holes 14 The amount of compressed air escaping per unit of time depends on the flow resistance in the distribution channel 34 between the inlet opening 62 and the relevant hole 14. An equal amount of compressed air per unit time can be achieved in all holes 14 can be achieved that either the distribution channel 34 in the direction of nearest hole 14 to the distant hole 14 an increasing has smaller resistance or preferably in that the holes with increasing distance from the compressed air inlet opening 62 an increasing have a larger opening cross-section. Here, the hole 14, which the shortest flow path from the inlet opening 62 is the smallest Opening cross-section, and the most distant hole 14 the largest Opening cross section. However, such measures are technically complex and expensive. They can also be used in the invention. However, the Invention the opening cross-sections in the manner mentioned so small that too without such measures, an equal amount of shaping air flow at all holes 14 is achieved per unit of time.

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 powder coating material, for example for sprayers with a spray outlet in the form of a Round jet or flat jet, with cylindrical or funnel-like shape, with or without impact body 60 or baffle, and also for sprayers whose Spray outlet 4 provided with a rotary body or by such is formed. The invention is also suitable for corona sprayers at which on the at least one high-voltage electrode 23, 24, 25 Corona discharges are generated, and also for so-called tribo-sprayers, in which the electrostatic charge of the spray coating material particles is generated by friction thereof in the coating material channel 2.

Die Erfindung ermöglicht eine homogene Luftverteilung der Formungs-Druckluft um 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 forming compressed air the spray stream 8 around. For this, only a small amount of compressed air per unit of time needed. The shaping air flow 11 generated according to the invention has one stabilizing effect on the spray stream 8, which is more in the form of a Spray cloud as a spray has. This spray stream is 8 or spray cloud much less sensitive to air currents in a coating booth than in the state of the art. This has the further advantage that the Application efficiency of the coating powder on an object to be coated and the coating quality, e.g. B. coating uniformity, significantly increased become.

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 Vorrichtung gehalten werden, z. B. von einem Roboter; Hubständer oder ortsfesten Träger.Sprayers of this type are commonly used as a spray gun or spray gun referred to, both with a handle for manual operation are provided, as well as when they are as straight or angular automatic pistols are formed, which are held by a device, for. B. from one Robot; Lifting stand or fixed carrier.

Claims (10)

Sprühgerät für Beschichtungsmaterial (6), insbesondere Beschichtungspulver, enthaltend einen Beschichtungsmaterialkanal (2); einen Sprühauslass (4) am stromabwärtigen Ende des Beschichtungsmaterialkanals (2) zum Sprühen des Beschichtungsmaterials (6) auf ein zu beschichtendes Objekt; einen Formungsluftauslass (10) für Formungs-Druckluft, welcher sich nahe bei dem Sprühauslass (4) und dem Strömungsweg des Beschichtungsmaterials (6) herum erstreckt, getrennt von dem Strömungsweg, und ausgebildet ist, um aus Druckluft einen den Beschichtungsmaterial-Sprühstrahl (8) einhüllenden Formungsluftstrom (11) zu erzeugen; wobei der Formungsluftauslass (10) durch eine große Vielzahl von Löchern (14) in einem Körper (16) gebildet ist, welche um den Strömungsweg des Beschichtungsmaterials (6), getrennt von diesem, herum verteilt angeordnet sind und nach vorne zum Beschichtungsmaterial-Sprühstrahl (8) zeigen,
dadurch gekennzeichnet, dass ein Umgebungsluftdurchgang (50) mit Abstand relativ zu den Löchern (14) radial nach innen versetzt vorgesehen ist, welcher sich von einer hinter dem Körper (16), in welchem die Löcher (14) gebildet sind, gelegenen Umgebungsluft-Eintrittsstelle (52) zu einer vor dem Körper (16), in welchem die Löcher (14) gebildet sind, gelegenen Luftaustrittsstelle (54) erstreckt und sich einteilig oder in Form von mehreren Öffnungen um den Strömungsweg des Beschichtungsmaterials (6), getrennt von diesem Strömungsweg, herum erstreckt, so dass Umgebungsluft (56) von der hinteren Lufteintrittsstelle (52) zur vorderen Luftaustrittsstelle (54) durch den Umgebungsluftdurchgang (50) hindurch saugbar ist durch Strömungs-Saugwirkung des Beschichtungsmaterial-Sprühstrahls (8) und/oder durch Strömungs-Saugwirkung des Formungsluftstromes (11).Spraying device for coating material (6), in particular coating powder, containing 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; a shaping air outlet (10) for shaping compressed air, which extends close to the spray outlet (4) and the flow path of the coating material (6), separate from the flow path, and is designed to draw compressed air from the coating material spray jet (8) generate an enveloping shaping air stream (11); wherein the shaping air outlet (10) is formed by a large plurality of holes (14) in a body (16) which are distributed around the flow path of the coating material (6), separated therefrom, and forward to the coating material spray jet ( 8) show
characterized in that an ambient air passage (50) is provided spaced radially inward relative to the holes (14), which is from an ambient air entry point located behind the body (16) in which the holes (14) are formed (52) extends to an air outlet point (54) located in front of the body (16) in which the holes (14) are formed and extends in one piece or in the form of a plurality of openings around the flow path of the coating material (6), separate from this flow path , extends around, so that ambient air (56) from the rear air inlet point (52) to the front air outlet point (54) can be sucked through the ambient air passage (50) by flow suction of the coating material spray jet (8) and / or by flow suction the shaping air flow (11). Sprühgerät nach Anspruch 1,
dadurch gekennzeichnet, dass der Körper (16) an den Löchern (14) ungeteilt ist.Spraying device according to claim 1,
characterized in that the body (16) is undivided at the holes (14). Sprühgerät nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass mindestens zehn oder mehr von den Löchern (14) vorgesehen sind.Spraying device according to claim 1 or 2,
characterized in that at least ten or more of the holes (14) are provided. Sprühgerät nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der Abstand (18) der Löcher (14) voneinander, in Umfangsrichtung um den Strömungsweg des Beschichtungsmaterials (6) gesehen, mindestens um den Faktor fünf oder mehr, vorzugsweise mindestens zehn, größer ist als die Öffnungsgröße der Löcher (14) in dieser Umfangsrichtung.Spraying 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 at least five times or more, preferably at least ten, larger than the opening size of the holes (14) in this circumferential direction. Sprühgerät nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der Öffnungsquerschnitt von jedem Loch (14) kleiner als 2,0 mm2 ist, vorzugsweise kleiner als 1,0 mm2 oder noch bevorzugter kleiner als 0,5 mm2 oder kleiner als 0,3 mm2. Spraying 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 mm 2 , preferably less than 1.0 mm 2 or more preferably less than 0.5 mm 2 or less than 0.3 mm 2 . Sprühgerät nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die Löcher (14) einen kreisrunden Querschnitt haben.Spraying device according to at least one of the preceding claims,
characterized in that the holes (14) have a circular cross section. Sprühgerät nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der Körper (16) ein Schlauch oder ein Rohr ist, welcher bzw. welches den Strömungsweg des Beschichtungsmaterials (6), getrennt von diesem, umgibt, und dass die Löcher (14) in der Wand des Schlauches bzw. des Rohres gebildet sind.Spraying device according to at least one of the preceding claims,
characterized in that the body (16) is a hose or tube which surrounds the flow path of the coating material (6), separate therefrom, and in that the holes (14) in the wall of the hose or tube are formed. Sprühgerät nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass das Auslassende der Löcher (14) relativ zum Sprühauslass (4) stromaufwärts zurückversetzt angeordnet ist.Spraying device according to at least one of the preceding claims,
characterized in that the outlet end of the holes (14) is set back upstream relative to the spray outlet (4). Sprühgerät nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass alle Löcher (14) oder Gruppen von Löchern (14) je mit einem Druckluft-Verteilerkanal (34) in Strömungsverbindung, sind, der mindestens eine Druckluft-Einlassöffnung (62) aufweist.Spraying device according to at least one of the preceding claims,
characterized in that all holes (14) or groups of holes (14) are each in flow communication with a compressed air distribution channel (34) which has at least one compressed air inlet opening (62). Sprühgerät nach Anspruch 9,
dadurch gekennzeichnet, dass der Öffnungsquerschnitt des Verteilerkanals (34) und die Öffnungsquerschnitte der Löcher (14) aufeinander derart abgestimmt sind, dass aus allen Löchern (14) die gleiche Druckluftmenge pro Zeiteinheit ausströmen kann.Spraying device according to claim 9,
characterized in that the opening cross section of the distribution channel (34) and the opening cross sections of the holes (14) are coordinated with one another in such a way that the same amount of compressed air per unit time can flow out of all holes (14).
EP04007899A 2003-05-05 2004-04-01 Powder spray coating device Expired - Lifetime EP1475159B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10319916 2003-05-05
DE10319916A DE10319916A1 (en) 2003-05-05 2003-05-05 Spraying device for coating material, in particular coating powder

Publications (2)

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EP1475159A1 true EP1475159A1 (en) 2004-11-10
EP1475159B1 EP1475159B1 (en) 2006-08-30

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EP04007899A Expired - Lifetime EP1475159B1 (en) 2003-05-05 2004-04-01 Powder spray coating device

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US (1) US7478763B2 (en)
EP (1) EP1475159B1 (en)
JP (1) JP2004330190A (en)
KR (1) KR100636003B1 (en)
CN (1) CN1572376A (en)
AT (1) ATE337857T1 (en)
AU (1) AU2004201870B2 (en)
CA (1) CA2466245C (en)
DE (2) DE10319916A1 (en)
ES (1) ES2271728T3 (en)
NZ (1) NZ532761A (en)
PT (1) PT1475159E (en)
TW (1) TWI278353B (en)

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US20060237556A1 (en) * 2005-04-26 2006-10-26 Spraying Systems Co. System and method for monitoring performance of a spraying device
US8371517B2 (en) * 2007-06-29 2013-02-12 Illinois Tool Works Inc. Powder gun deflector
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KR102115577B1 (en) * 2019-11-28 2020-05-27 주식회사 보국강업 Color powder coating apparatus
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Also Published As

Publication number Publication date
TW200507943A (en) 2005-03-01
TWI278353B (en) 2007-04-11
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
EP1475159B1 (en) 2006-08-30
ATE337857T1 (en) 2006-09-15
CN1572376A (en) 2005-02-02

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