EP0108929B2 - Apparatus for dispensing a liquid - Google Patents

Apparatus for dispensing a liquid Download PDF

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Publication number
EP0108929B2
EP0108929B2 EP83110121A EP83110121A EP0108929B2 EP 0108929 B2 EP0108929 B2 EP 0108929B2 EP 83110121 A EP83110121 A EP 83110121A EP 83110121 A EP83110121 A EP 83110121A EP 0108929 B2 EP0108929 B2 EP 0108929B2
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EP
European Patent Office
Prior art keywords
valve
needle
liquid
valve needle
bore
Prior art date
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EP83110121A
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German (de)
French (fr)
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EP0108929A2 (en
EP0108929A3 (en
EP0108929B1 (en
Inventor
Hans Behr
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Hermann Behr and Sohn GmbH and Co
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Hermann Behr and Sohn GmbH and Co
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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
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/3066—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the valve element being at least partially hollow and liquid passing through it when the valve is opened
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1418—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet for supplying several liquids or other fluent materials in selected proportions to a single spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • 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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0408—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing two or more liquids

Definitions

  • the invention relates to a device for dispensing liquid, in particular by means of a nozzle, with a shut-off valve which has a valve seat which is internally optionally conical and an axial valve needle which is hollow for the radially inner liquid supply and whose end remote from the valve can be connected to a liquid source, optionally with a correspondingly conical one , Tip as valve body, which has at least one bore connected to the cavity of the valve needle with radial component, which opens into an annular space on the valve seat radially between this and a single coaxial, for radially external liquid return, surrounding the valve needle surrounding liquid guide tube, the valve distal end of which a liquid sink can be connected.
  • Tip of the valve needle can be any form of the needle end used as the valve body, since its diameter is in any case small compared to the length of the needle.
  • a plate valve could also be formed by means of a "tip” needle, which bluntly abuts a superficially flat valve seat.
  • valve needle is large i v formed and surrounded by an ink supply tube, the wall of which is provided with bores directed obliquely rearward with respect to the axis, which open into a coaxial return tube which surrounds the ink supply tube radially on the outside and can be connected to an ink sink.
  • the valve needle has a tube, at the axially front end of which an attachment piece forming the needle tip is attached, which is provided with the oblique bore and an axial blind bore which, on the one hand, into the tube the valve needle and on the other hand opens into the oblique bore.
  • oblique bores which are evenly distributed over the circumference of the needle tip and on the one hand offer a relatively low flow resistance when the valve is open and on the other hand cause a deflection of the possibly shared ink flow into the color return.
  • the valve needle can be produced relatively easily and cheaply in the proposed embodiment.
  • valve needle contains a static mixer, which is expediently arranged in the tube of the valve needle and opens into the blind bore of the attachment piece (needle tip).
  • a paint nozzle 2 of an otherwise not shown paint spraying device is screwed with the interposition of an O-ring 4 in the axial, cylindrical extension 6 of a conical valve seat 8, which is fitted into the front end of a radially outer paint guide tube 10 serving the color return.
  • the tube 10 encloses a coaxial, hollow valve needle 12, the conical tip 14 of which forms a valve body which interacts with the valve seat 8 and which is part of an extension piece 16 which is glued into the front end of a radially inner tube 18 which mainly forms the valve needle 12 and serves the ink supply, the latter
  • Cavity contains a static mixer 20 which, as indicated, works without moving parts by the fluids to be mixed, e.g. B.
  • the extension piece 16 has an axial blind bore 22 which opens into the cavity of the tube 18 at the front end of the mixer 20 and from the inner end of which a plurality of oblique, forward-diverging bores 24 extend evenly distributed over the circumference of the needle tip 14, Seen in the direction of flow, open axially in front of the valve 8-14 in an annular space 26 between the valve needle 12 and the color return pipe 10.
  • a radially narrow, long collar 28 of the tube 10 this leads the extension 16 to form a small gap 30, which ensures that the flow resistance for the returned paint is greater than the flow resistance when the valve is open for the paint supplied to the paint spraying device.
  • This device can have a rotating atomizer bell or disc, on the surface of which the paint passes from the nozzle 2.

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  • Nozzles (AREA)

Description

Die Erfindung betrifft eine Einrichtung zur Flüssigkeitsabgabe, insbesondere mittels einer Düse, mit einem Sperrventil, das einen, innerlich gegebenenfalls konischen, Ventilsitz und eine axiale, zur radial inneren Flüssigkeitszuführung hohle Ventilnadel, deren ventilfernes Ende an eine Flüssigkeitsquelle anschließbar ist, mit, gegebenenfalls entsprechend konischer, Spitze als Ventilkörper aufweist, die mindestens eine an den Hohlraum der Ventilnadel angeschlosseneBohrung mit radialer Komponente besitzt, welche in einen Ringraum am Ventilsitz radial zwischen diesem und einem einzigen koaxialen, zur radial äußeren Flüssigkeitsrückführung bestimmten, die Ventilnadel umgebenden Flüssigkeitsführungsrohr mündet, dessen ventilfernes Ende an eine Flüssigkeitssenke anschließbar ist.The invention relates to a device for dispensing liquid, in particular by means of a nozzle, with a shut-off valve which has a valve seat which is internally optionally conical and an axial valve needle which is hollow for the radially inner liquid supply and whose end remote from the valve can be connected to a liquid source, optionally with a correspondingly conical one , Tip as valve body, which has at least one bore connected to the cavity of the valve needle with radial component, which opens into an annular space on the valve seat radially between this and a single coaxial, for radially external liquid return, surrounding the valve needle surrounding liquid guide tube, the valve distal end of which a liquid sink can be connected.

"Spitze" der Ventilnadel kann jede Form des als Ventilkörper verwendeten Nadelendes sein, da dessen Durchmesser im Vergleich zur Nadellänge jedenfalls klein ist. Statt eines Kegelventils könnte also auch ein Plattenventil mittels einer Nadel"spitze" gebildet sein, die stumpf auf einen oberflächlich ebenen Ventilsitz stößt."Tip" of the valve needle can be any form of the needle end used as the valve body, since its diameter is in any case small compared to the length of the needle. Instead of a cone valve, a plate valve could also be formed by means of a "tip" needle, which bluntly abuts a superficially flat valve seat.

Bei einer bekannten Einrichtung zur Flüssigkeitsabgabe, mit Koaxialanordnung einer radial inneren Ventilnadel, deren konische Spitze den Ventilkörper eines Sitzventils einer Farbspritzeinrichtung bildet, und zumindest eines radial äußeren Farbführungsrohres, dessen ventilfemes Ende an eine Farbquelle oder-senke anschließbar ist, ist die Ventilnadel mas- siv ausgebildet und von einem Farbzuführungsrohr umgeben, dessen Wandung mit bezüglich der Achse schräg nach hinten gerichteten Bohrungen versehen ist, die in ein das Farbzuführungsrohr radial außen umgebendes koaxiales Rückführungsrohr münden, das an eine Farbsenke anschließbar ist. Infolgedessen besteht die Möglichket, selbst bei geschlossenem Ventil im Farbzuführungsrohr stehende Farbe umlaufen zu lassen oder wenigstens zurückzudrucken, um das Farbzu- und rückführungsrohr im geschlossenen, sich weit nach vom erstreckenden Kreislauf zu spülen, der vermeidet, daß schädliche Emissionen von der Farbspritzeinrichtung ausgehen, die dann nur noch in ihrem stromab hinter dem Farbventil gelegenen Teil gereinigt zu werden braucht wobei lediglich geringe Mengen Spülmittel in die Luft der Spritzkabine gelangen, welche die Verwendung einervon Zeit zu Zeit umständlich zu reinigenden Vor richtung zum Auffangen des Gemisches aus Restfarbe und Spülmittel kostensparend entbehrlich machen. Bei der bekannten Anordnung ist aber unvermeidbar, daß sich Farbe an den inneren Oberflächen des Farbzuführungs- und des Farbrückführungsrohres absetzt, so daß ein Farbwechsel eine Oberfiächenreinigung erfordert, die grundsätzlich einen Farbveriust mit sich bringt. Der Erfindung liegt daher die Aufgabe zugrunde, eine Koaxialanordnung für die Farbzuführung und -rückführung einer Farbspritzeinfichtung zu schaffen, welche einen geringeren Reinigungsaufwand erfordert und kleinere Farbvenuste verursachtIn a known device for dispensing liquid, with a coaxial arrangement of a radially inner valve needle, the conical tip of which forms the valve body of a seat valve of a paint spraying device, and at least one radially outer paint guide tube, the valve-distal end of which can be connected to a paint source or sink, the valve needle is large i v formed and surrounded by an ink supply tube, the wall of which is provided with bores directed obliquely rearward with respect to the axis, which open into a coaxial return tube which surrounds the ink supply tube radially on the outside and can be connected to an ink sink. As a result, there is a possibility of circulating or at least printing back ink standing in the ink supply tube even with the valve closed to flush the ink supply and return tube in the closed, far from the extending circuit which avoids harmful emissions from the paint sprayer that then only needs to be cleaned in its downstream part behind the paint valve, only small amounts of washing-up liquid get into the air of the spray booth, which makes the use of a device which is cumbersome to clean from time to time unnecessary to collect the mixture of residual paint and washing-up liquid . In the known arrangement, however, it is unavoidable that color is deposited on the inner surfaces of the ink supply and the color return pipe, so that a color change requires a surface cleaning, which in principle results in a loss of color. The invention is therefore based on the object of providing a coaxial arrangement for the ink supply and return of an ink spraying device, which requires less cleaning effort and causes less ink consumption

Diese Aufgabe ist bei einer Koaxialanordnung der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß die Bohrung der Nadelspitze bezüglich der Nadelachse schräg nach vorn gegen den Ventilsitz gerichtet ist und daß das Flüssigkeitsrohr mit einem das vordere Ende der Ventilnadel, unter Bildung eines an den Ringraum anschließenden Ringspaltes, führenden Innenbund versehen ist, wobei zu unterstellen ist, daß der Flüssigkeitsströmungswiderstand bei geöffnetem Sperrventil stromab axial vor der Bohrungsmündung größer ist als der gleiche Widerstand axial hinter dieser Mündung, was auf irgendeine Weise der Fall sein muß, zum Beispiel durch Absperren der Flüssigkeitsrückführung. Dadurch wird vorteilhafterweise erreicht, daß, verglichen mit der bekannten Koaxialanordnung, bei gleicher lichter Querschnittsfläche der Farbführung eine kleinere innere Oberfläche der Farbführung vorhanden ist, welche natürlich geringere Verluste an abgesetzter und zwecks Reinigung der Farbführung herausgespülter Farbe mit sich bringt. Infolgedessen läßt sich im Falle eines Farbwechsels die Farbführung auch schneller säubern, sodaß die Wechselzeiten vermindert sind.This object is achieved according to the invention in a coaxial arrangement of the type mentioned at the outset in that the bore of the needle tip is directed obliquely forward against the valve seat with respect to the needle axis and in that the liquid tube has a front end of the valve needle, forming an annular gap adjoining the annular space , leading inner collar is provided, it being assumed that the liquid flow resistance when the shut-off valve is opened downstream axially in front of the bore opening is greater than the same resistance axially behind this opening, which must be the case in some way, for example by blocking the liquid return. It is thereby advantageously achieved that, compared with the known coaxial arrangement, with the same clear cross-sectional area of the ink guide there is a smaller inner surface of the ink guide, which of course entails lower losses of separated ink and washed out for the purpose of cleaning the ink guide. As a result, the color guide can also be cleaned more quickly in the event of a color change, so that the changeover times are reduced.

Es ist zwar aus der DE-C-2 757 522 bekannt, eine hohle Ventilnadel zu benutzen. In dieser wird jedoch Lenk- oder Zerstäubungsluft geführt, während an ihrer radial äußeren Oberfläche die zu zerstäubende Farbe zu dem sich axial nach vorn verbreiternden Ende derVentilnadel geführt wird, welches mit seiner radial äußeren Umfangsfläche dichtet.It is known from DE-C-2 757 522 to use a hollow valve needle. In this, however, directing or atomizing air is guided, while the paint to be atomized is guided on its radially outer surface to the axially widening end of the valve needle, which seals with its radially outer peripheral surface.

Es ist aus der FR-A-2 280 843 (Fig. 1 und 2) auch schon eine Einrichtung zur Flüssigkunststoffabgabe in einen Polymerisationsprozeß bekannt, welche der Einrichtung dereingangsgennanten Art nur ähnelt, da die radiale Bohrungen der Ventilnadelspitze radial innerhalb des Ventilsitzes in einen Ringraum münden, der durch einen zylindrischen Abschnitt des Flüssigkeitsrückführungsrohrs vom Ventilsitz axial entfernt ist. Weil dort aber die Bohrungen der Ventilspitze radial verlaufen und ein als Drossel sowie Führung des vorderen Ventilnadelendes wirkender Innenbund des äußeren Flüssigkeitsführungsrohres fehlt, ergeben sich demgegenüber bei der erfindungsgemäßen Einrichtung bessere Strömungsverhältnisse und außerdem ein verbesserter Ventilschließvorgang.From FR-A-2 280 843 (Figs. 1 and 2) a device for dispensing liquid plastic into a polymerization process is already known, which only resembles the device of the type mentioned at the beginning, since the radial bores of the valve needle tip radially inside the valve seat in an annular space open, which is axially removed from the valve seat by a cylindrical portion of the liquid return pipe. However, because there the bores of the valve tip run radially and an inner collar of the outer liquid guide tube, which acts as a throttle and guide for the front valve needle end, is missing, in contrast, better flow conditions and an improved valve closing process result in the device according to the invention.

Bei einer bevorzugten Ausführungsform der erfindungsgemäßen Koaxialanordnung weist die Ventilnadel ein Rohr auf, an dessen axial vorderem Ende ein die Nadelspitze bildendes Ansatzstück befestigt ist, das mit der schrägen Bohrung und einer axialen Sackbohrung versehen ist, die einerseits in das Rohr der Ventilnadel und andererseits in die schräge Bohrung mündet. Zweckmäßig sind mehrere schräge Bohrungen vorhanden, die gleichmäßig auf den Umfang der Nadelspitze verteilt sind und einerseits bei geöffnetem Ventil einen relativ kleinen Strömungswiderstand bieten sowie andererseits eine Ablenkung des gegebenenfalls geteilten Farbstromes in die Farbrückführung bewirken. Die Ventilnadel läßt sich in der vorgeschlagenen Ausgestaltung verhältnismäßig einfach und billig herstellen.In a preferred embodiment of the coaxial arrangement according to the invention, the valve needle has a tube, at the axially front end of which an attachment piece forming the needle tip is attached, which is provided with the oblique bore and an axial blind bore which, on the one hand, into the tube the valve needle and on the other hand opens into the oblique bore. There are expediently several oblique bores, which are evenly distributed over the circumference of the needle tip and on the one hand offer a relatively low flow resistance when the valve is open and on the other hand cause a deflection of the possibly shared ink flow into the color return. The valve needle can be produced relatively easily and cheaply in the proposed embodiment.

Mehrere Komponenten einer Farbflüssigkeit, z. B. Stammlack und Härter eines 2-Komponenten-Lackes, sollen gemäß der unter Art. 54 (3) EPU fallenden EP-A2-0 104 395 getrennt in die nächste Nähe des Zerstäubungsortes geführt und anschließend gemischt werden, solange sie über die restliche Strecke bis zum Zerstäubungsort befördert werden. Dementsprechend ist bei der bevorzugten Ausführungsform vorgesehen, daß die Ventilnadel einen statischen Mischer enthält, der zweckmäßig in dem Rohr der Ventilnadel angeordnet ist und in die Sackbohrung des Ansatzstückes (Nadelspitze) mündet.Several components of a color liquid, e.g. B. master varnish and hardener of a two-component varnish should, according to EP-A2-0 104 395 falling under Art. 54 (3) EPU, be led separately into the immediate vicinity of the atomization point and then mixed as long as they cover the remaining distance be transported to the atomization site. Accordingly, it is provided in the preferred embodiment that the valve needle contains a static mixer, which is expediently arranged in the tube of the valve needle and opens into the blind bore of the attachment piece (needle tip).

Im folgenden ist die Erfindung anhand der durch die Zeichnung beispielhaft dargestellten bevorzugten Ausführungsform der erfindungsgemäßen Koaxialanordnung im einzelnen erläutert. Die einzige Figur der Zeichnung zeigt einen rechts abgebrochenen zentralen Längsschnitt durch die Ausführungsform.The invention is explained in detail below with reference to the preferred embodiment of the coaxial arrangement according to the invention, which is shown by way of example in the drawing. The only figure of the drawing shows a central longitudinal section broken through to the right through the embodiment.

Eine Farbdüse 2 einer im übrigen nicht dargestellten Farbspritzeinrichtung ist unter Zwischenlegung eines O-Ringes 4 in den axialen, zylindrischen Fortsatz 6 eines konischen Ventilsitzes 8 geschraubt, der in das vordere Ende eines der Farbrückführung dienenden, radial äußeren Farbführungsrohres 10 eingepaßt ist Das Rohr 10 umschließt eine koaxiale, hohle Ventilnadel 12, deren konische Spitze 14 einen mit dem Ventilsitz 8 zusammenwirkenden Ventilkörper bildet, der Teil eines Ansatzstückes 16 ist das in das vordere Ende eines die Ventilnadel 12 hauptsächlich bildenden, der Farbzuführung dienenden, radial inneren Rohres 18 eingeklebt ist, dessen Hohlraum einen statischen Mischer 20 enthält, der, wie angedeutet, ohne bewegte Teile arbeitet, indem die zu mischenden Fluide, z. B. Stammlack und Härter, durch ein Labyrinth oder zwischen Schikanen hindurchgedrückt werden, wobei sie sich innig vermischen. Solche Mischer sind im Handel erhältlich. Das Ansatzstück 16 weist eine axiale Sackbohrung 22 auf, die am vorderen Ende des Mischers 20 in den Hohlraum des Rohres 18 mündet und von deren innerem Ende mehrere gleichmäßig auf den Umfang der Nadelspitze 14 verteilte, schräge, nach vorn divergierende Bohrungen 24 ausgehen, die, in Strömungsrichtung gesehen, axial vor dem Ventil 8 - 14 in einen Ringraum 26 zwischen Ventilnadel 12 und Farbrückführungsrohr 10 münden. Mittels eines radial schmalen, langen Bundes 28 des Rohres 10 führt dieses das Ansatzstück 16 unter Bildung eines geringen Spaltes 30, der dafür sorgt, daß der Strömungswiderstand für die zurückgeführte Farbe größer ist als der Strömundswiderstand bei geöffnetem Ventil für die der Farbspritzeinrichtung zugeführte Farbe.A paint nozzle 2 of an otherwise not shown paint spraying device is screwed with the interposition of an O-ring 4 in the axial, cylindrical extension 6 of a conical valve seat 8, which is fitted into the front end of a radially outer paint guide tube 10 serving the color return. The tube 10 encloses a coaxial, hollow valve needle 12, the conical tip 14 of which forms a valve body which interacts with the valve seat 8 and which is part of an extension piece 16 which is glued into the front end of a radially inner tube 18 which mainly forms the valve needle 12 and serves the ink supply, the latter Cavity contains a static mixer 20 which, as indicated, works without moving parts by the fluids to be mixed, e.g. B. master varnish and hardener, pressed through a labyrinth or between chicanes, where they mix intimately. Such mixers are commercially available. The extension piece 16 has an axial blind bore 22 which opens into the cavity of the tube 18 at the front end of the mixer 20 and from the inner end of which a plurality of oblique, forward-diverging bores 24 extend evenly distributed over the circumference of the needle tip 14, Seen in the direction of flow, open axially in front of the valve 8-14 in an annular space 26 between the valve needle 12 and the color return pipe 10. By means of a radially narrow, long collar 28 of the tube 10, this leads the extension 16 to form a small gap 30, which ensures that the flow resistance for the returned paint is greater than the flow resistance when the valve is open for the paint supplied to the paint spraying device.

Diese Einrichtung kann eine rotierende Zerstäuberglocke oder -scheibe aufweisen, auf deren Oberfläche die Farbe aus der Düse 2 übertritt.This device can have a rotating atomizer bell or disc, on the surface of which the paint passes from the nozzle 2.

Claims (4)

1. Apparatus for dispensing a liquid, especially by means of a nozzle (2), with a check valve (8, 14), which is provided with a valve seat (8), which is where applicable inside conical, and an axial hollow valve needle (12) for the radial internal feed of the liquid, the valve needle end which is at a distance from the valve being connectable to a source of liquid, said valve needle (12) as a valve body having a point (14) which is where applicable correspondingly conical, whereby the point is provided with at least one bore (24) with radial component which bore is connected to the hollow space of the valve needle (12) and opens out into an annular space (26) arranged at the valve seat (8) radially between the latter and a sole coaxial liquid feed pipe (10) which surrounds the valve needle and is determined for the radial outer return feed of the liquid, and the end of which liquid feed pipe, which end is at a distance from the valve, being connectable to a liquid dip, characterised in that the bore (24) of the needle point (14) is in relation to the needle axis directed obliquely forwards against the valve seat (8) and in that the liquid feed pipe (10) is provided with an internal collar (28) guiding the forward end (16) of the valve needle (12) with the formation of an annular gap (30) which is annexed to the annular space (26).
2. Apparatus according to claim 1, characterised in that the valve needle (12) has a tube (18), at the axial forward end of which a lengthening piece (16) forming the needle point (14) is attached, which piece is provided with the oblique bore (24) and an axial blind bore (22), which on one side opens out into the tube (18) of the valve needle (12) and on the other side into the oblique bore (24).
3. Apparatus according to claim 1 or 2 characterised in that the valve needle (12) contains a static mixer (20).
4. Apparatus according to claims 2 and 3, characterised in that the mixer (20) is disposed in the tube (18) of the valve needle (12) and opens out into the blind bore (22).
EP83110121A 1982-11-11 1983-10-11 Apparatus for dispensing a liquid Expired - Lifetime EP0108929B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8231663U 1982-11-11
DE19828231663U DE8231663U1 (en) 1982-11-11 1982-11-11 NOZZLE WITH CONNECTING COAXIAL ARRANGEMENT FOR A COLOR SPRAYING DEVICE

Publications (4)

Publication Number Publication Date
EP0108929A2 EP0108929A2 (en) 1984-05-23
EP0108929A3 EP0108929A3 (en) 1985-09-25
EP0108929B1 EP0108929B1 (en) 1988-06-29
EP0108929B2 true EP0108929B2 (en) 1991-09-04

Family

ID=6745464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110121A Expired - Lifetime EP0108929B2 (en) 1982-11-11 1983-10-11 Apparatus for dispensing a liquid

Country Status (4)

Country Link
US (1) US4667878A (en)
EP (1) EP0108929B2 (en)
JP (1) JPS5998757A (en)
DE (2) DE8231663U1 (en)

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CN101970127B (en) 2008-03-12 2014-11-12 杰弗里·D·福克斯 Disposable spray gun cartridge
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Also Published As

Publication number Publication date
DE8231663U1 (en) 1983-08-18
EP0108929A2 (en) 1984-05-23
EP0108929A3 (en) 1985-09-25
US4667878A (en) 1987-05-26
JPS5998757A (en) 1984-06-07
DE3377199D1 (en) 1988-08-04
JPH0249141B2 (en) 1990-10-29
EP0108929B1 (en) 1988-06-29

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