EP1915216B1 - Mixing head - Google Patents

Mixing head Download PDF

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Publication number
EP1915216B1
EP1915216B1 EP06777591A EP06777591A EP1915216B1 EP 1915216 B1 EP1915216 B1 EP 1915216B1 EP 06777591 A EP06777591 A EP 06777591A EP 06777591 A EP06777591 A EP 06777591A EP 1915216 B1 EP1915216 B1 EP 1915216B1
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EP
European Patent Office
Prior art keywords
nozzle
swirl
mixing head
constructed
insert
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.)
Not-in-force
Application number
EP06777591A
Other languages
German (de)
French (fr)
Other versions
EP1915216B8 (en
EP1915216A1 (en
Inventor
Ernst Scheidt
Stefan Hobelsberger
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.)
KraussMaffei Technologies GmbH
Original Assignee
Bayerische Motoren Werke AG
KraussMaffei Technologies GmbH
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Filing date
Publication date
Application filed by Bayerische Motoren Werke AG, KraussMaffei Technologies GmbH filed Critical Bayerische Motoren Werke AG
Priority to PL06777591T priority Critical patent/PL1915216T3/en
Publication of EP1915216A1 publication Critical patent/EP1915216A1/en
Publication of EP1915216B1 publication Critical patent/EP1915216B1/en
Application granted granted Critical
Publication of EP1915216B8 publication Critical patent/EP1915216B8/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
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • B05B1/3421—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with channels emerging substantially tangentially in the swirl chamber
    • B05B1/3431—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with channels emerging substantially tangentially in the swirl chamber the channels being formed at the interface of cooperating elements, e.g. by means of grooves
    • B05B1/3436—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with channels emerging substantially tangentially in the swirl chamber the channels being formed at the interface of cooperating elements, e.g. by means of grooves the interface being a plane perpendicular to the outlet axis
    • 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
    • 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
    • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge

Definitions

  • the present invention relates to a polyurethane mixing head with a spray nozzle according to the preamble of claim 1 and the use of a nozzle for a spray head of a polyurethane mixing head according to the preamble of claim 13.
  • Methods and devices for applying a spray layer on a surface, in particular a polyurethane spray layer are, for example, from EP 0 303 305 B1 as well as the EP 0 389 014 B1 known.
  • a nozzle which is used for a sputtering gun and serves to produce a polyurethane layer on a surface by spraying the reaction components.
  • the atomizing nozzle comprises a sputtering piece having a substantially funnel-shaped cavity which is connected on the one hand at its widest side to a supply channel for the reaction components for obtaining the polyurethane and on the other hand terminates at its narrowest point in a substantially cylindrical channel.
  • a core member is provided which is adapted to direct the reaction components in a screw or swirling motion through said atomizing opening.
  • the object of the present invention is to provide a polyurethane mixing head, with which a material discharge with a desired Austragskegel is achieved in an optimal manner.
  • the swirl body of the nozzle of the polyurethane mixing head is substantially disc-shaped or plate-shaped and has an annular web arranged thereon.
  • the disk-shaped or plate-shaped part has radially outside the annular web at least one, but preferably a plurality of openings. These can be provided in the form of holes or grooves.
  • the ring land is also broken at least at one point, but preferably at several points, radially from outside to inside by at least one straight or spiral groove.
  • the swirl body and the nozzle insert is arranged in the nozzle body and the nozzle body is formed such that i) between the material inlet and the at least one opening opening there is a flow connection, ii) radially outside of the ring land and between the substantially disc-shaped or plate-shaped part and the nozzle insert, an annular channel is formed, which is in flow communication with the at least one aperture opening, iii) radially within the annular web, the swirl chamber is formed, iv) the swirl chamber is in flow communication via at least one straight or spiral groove formed with the annular channel.
  • a discharge material is supplied to the nozzle body via a material supply. From the material inlet, the material flows in the direction of the breakthrough openings. About the breakthrough openings, it enters the annulus outside of the ring land. From there it enters the swirl chamber via the essentially spiral-shaped grooves.
  • the Austragsmaterial is provided in terms of movement with a swirl component and receives a rotational velocity component. From the swirl chamber, the discharge material is then sprayed through the nozzle bore. Due to the swirl component and the shape of the nozzle bore, an optimal discharge cone is created.
  • the breakthrough openings can, as already mentioned above, be realized in the form of bores, but also of peripheral grooves in the essentially disc-shaped or plate-shaped part of the swirl body. Both the holes, as well as the grooves are quite easy to produce. It has proven to be particularly advantageous if the breakthrough openings are already realized with an inclination relative to the vertical of the disk-shaped or plate-shaped part. In this case, a swirl component is already given to the discharge material as it passes through the breakthrough openings and when flowing into the radially outer annular channel. Of course, in such a case, the inclination of the apertures and the shape of the helical grooves should be made coordinated with each other so as to enhance the swirling effects.
  • the breakthrough openings and the spirally formed grooves are preferably circumferentially offset from each other. In this way, it is avoided that the starting material passing through the apertures openings immediately immediately through the spiral grooves flow through, without first in the circumferential direction to flow through the radially outer annular channel at least partially.
  • the present nozzle should be particularly simple, easy to install and service friendly. This is ensured by the fact that both the swirl body and the nozzle insert are in principle removable.
  • the nozzle insert is screwed into the nozzle body, being held by screwing the nozzle insert into the nozzle body of the swirl body in the nozzle body.
  • the nozzle body, the swirler and the nozzle insert can be made separately and then mounted in the simplest way.
  • the ease of service and maintenance is given, since by simply unscrewing the nozzle insert and the swirl body can be removed and all elements are easy to clean.
  • the swirl body can then be easily inserted into the nozzle body when the cavity in the form of a narrowing from the outside inward bore, in particular a stepped bore is formed.
  • the swirler can rest against the wall of the cavity or be supported on a step.
  • a spray nozzle for a spray head is shown.
  • a spray nozzle is attached to a mixing head lance 10, which is arranged on a mixing head, not shown, a polyurethane system.
  • a mixing head lance 10 which is arranged on a mixing head, not shown, a polyurethane system.
  • a mixing head - including such a mixing head - can for example Fig. 1 of the EP 0 389 014 B1 be removed.
  • such a mixing head is supplied with two reactive starting materials, for example polyol and isocyanate. These materials are then mixed together in the mixing head and then discharged.
  • the reactive Austragsgemisch can then be applied to a surface where it reacts and forms a plastic skin.
  • this skin may be formed with a ridged surface or an otherwise structured surface. These skins can be further processed by injection molding or foam back, the skins themselves form the decorative surfaces.
  • a mixing head lance 10 is initially arranged on the mixing head - not shown - at the lower end of which (in the present case an adapter piece 12) a spray nozzle is attached.
  • the mixing head lance 10 makes it possible to spray even inaccessible areas to which the mixing head otherwise could not penetrate.
  • the mixing head lance 10 is provided with a central flow passage through which discharge material flows from the mixing head via the spray head port to the spray nozzle.
  • the adapter piece 12 adjoining the downstream end of the mixing head lance 10 is the adapter piece 12, which is fastened to the mixing head lance 10 by means of a union nut in such a way that the discharge material flows via the central channel in the mixing head lance flows directly into the aligned flow channel of the adapter piece 12.
  • an external thread is arranged, on which a nozzle body of the spray nozzle can be screwed.
  • an internal thread 32 is arranged on a mounting flange 30 of the spray nozzle.
  • the spray nozzle is presently substantially cylindrical and has perpendicular to the longitudinal axis of a provided with two stages 34 and 36 step bore.
  • the step bore narrows through the steps 34 and 36 from outside to inside, wherein the steps 34 and 36 form a total annular heels or -auflagen.
  • a swirl body 18 is supported radially on the outside. This swirler 18 is held by the nozzle insert 16 in abutment against the step 36.
  • the nozzle insert 16 is formed substantially disc-shaped or cup-shaped with a central nozzle bore 26 and has at its radial outer periphery a thread 42. With this thread, the nozzle insert 16 can be screwed into the step bore, which has an internal thread at this point. When the nozzle insert 16 is completely screwed in, its lower end adjoins the swirl body 18 and holds it firmly in the nozzle body 14.
  • the swirl body 18 has a substantially disc-shaped central part, which is broken by four edge grooves 44.
  • the peripheral grooves have an inclination relative to the perpendicular to the disk-shaped part.
  • an annular web 46 is arranged, which is also broken by four, from radially outward to radially inwardly extending grooves 48.
  • the grooves may be straight or spiral.
  • the annular rib 46 is formed flat at its upper, side facing away from the disc-shaped part side, so that it can rest tightly on the underside of the nozzle insert 16.
  • a swirl chamber 24 is formed in the nozzle bore 26th empties.
  • two engagement grooves 40 are still provided, in which a corresponding tool for tightening or loosening of the nozzle insert 16 can be recognized.
  • reactive material is supplied via the central channel of the mixing head lance 10 and the adapter piece 12 of the spray nozzle.
  • the reactive material flows through a material inlet into a flow in front of the swirler 18 inflow chamber 20. From the inflow chamber 20, the material flows through the four edge grooves 44 in the radially outside of the annular ridge 46 and between the nozzle insert 16, the plate-shaped part of Swirl body 18 and the nozzle body formed annular space 28th
  • the material enters through the spiral grooves 48 in the swirl chamber 24, wherein it comes on passing through the spiral grooves 48 again to an increase of the twist. That in the Swirl chamber 24 material has thus been placed on the peripheral grooves 44, the passage of the annular channel 28 and the spiral grooves 48 in a corresponding swirling motion and exits the swirl chamber through the nozzle bore 26 to the outside environment.
  • the presently formed nozzle provides a simply constructed, easy-to-clean and cost-effective nozzle that provides optimal spray results.

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  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

A nozzle for a spray head includes a nozzle body having a cavity which can be supplied with discharge material via a material feed and in which a swirl-inducing body is arranged which has arranged on it a nozzle insert with a nozzle bore via which the discharge material can be sprayed out. The swirl-inducing body has a disk or plate-shaped base on which an annular web is arranged, with the base being breached by at least one through opening which is arranged radially outside the annular web. The annular web is breached at least one point radially from the outside to the inside by at least one substantially straight or helical groove, and the swirl-inducing body and the nozzle insert are arranged in the nozzle body.

Description

Die vorliegende Erfindung betrifft einen Polyurethan-Mischkopf mit einer Sprühkopfdüse gemäß dem Oberbegriff des Anspruchs 1 sowie die Verwendung einer Düse für einen Sprühkopf eines Polyurethan-Mischkopfes gemäß dem Oberbegriff des Patentanspruchs 13.The present invention relates to a polyurethane mixing head with a spray nozzle according to the preamble of claim 1 and the use of a nozzle for a spray head of a polyurethane mixing head according to the preamble of claim 13.

Verfahren und Vorrichtungen zum Aufbringen einer Sprühschicht auf eine Oberfläche, insbesondere einer Polyurethan-Sprühschicht, sind beispielsweise aus der EP 0 303 305 B1 sowie der EP 0 389 014 B1 bekannt.Methods and devices for applying a spray layer on a surface, in particular a polyurethane spray layer are, for example, from EP 0 303 305 B1 as well as the EP 0 389 014 B1 known.

In der EP 0 389 014 B1 ist eine Düse beschrieben, die für eine Zerstäubungspistole verwendet wird und zur Erzeugung einer Polyurethan-Schicht auf einer Fläche durch Aufsprühen der Reaktionskomponenten dient. Die Zerstäubungsdüse weist ein Zerstäubungsstück mit einem im wesentlichen trichterförmigen Hohlraum auf, der einerseits an seiner breitesten Seite mit einem Zufuhrkanal für die Reaktionskomponenten zum Erhalten des Polyurethans verbunden ist und andererseits an seiner engsten Stelle in einem im wesentlichen zylindrischen Kanal ausläuft. Überdies ist ein Kernelement vorgesehen, das ausgebildet ist, um die Reaktionskomponenten in einer Schrauben- oder Wirbelbewegung durch die genannte Zerstäubungsöffnung zu leiten.In the EP 0 389 014 B1 For example, a nozzle is described which is used for a sputtering gun and serves to produce a polyurethane layer on a surface by spraying the reaction components. The atomizing nozzle comprises a sputtering piece having a substantially funnel-shaped cavity which is connected on the one hand at its widest side to a supply channel for the reaction components for obtaining the polyurethane and on the other hand terminates at its narrowest point in a substantially cylindrical channel. Moreover, a core member is provided which is adapted to direct the reaction components in a screw or swirling motion through said atomizing opening.

Aus den Dokumenten FR 2 116 973 , US 3,441,223 , WO 96/21517 sowie DE 101 38 622 sind verschiedene Düsen aus unterschiedlichen Anwendungsbereichen -wie beispielsweise der Kraftstoffeinspritzung, einer landwirtschaftlichen Anwendung etc. - bekannt, denen gemein ist, dass einem zu versprühendem Medium durch tangentiale Zufuhrkanäle ein Drehimpuls beim Eintritt in eine vor der Austrittsöffnung angeordnete Kammer mitgegeben wird. Der Einsatz einer solche Düse bei einem Polyurethan-Mischkopf geht daraus allerdings nicht hervor.From the documents FR 2 116 973 . US 3,441,223 . WO 96/21517 such as DE 101 38 622 are different nozzles from different applications - such as fuel injection, an agricultural application, etc. - known, which has in common that a medium to be sprayed through tangential supply channels an angular momentum when entering a chamber arranged in front of the outlet opening is given. However, the use of such a nozzle in a polyurethane mixing head is not apparent.

Aufgabe der vorliegenden Erfindung ist es, einen Polyurethan-Mischkopf anzugeben, mit dem ein Materialaustrag mit einem gewünschten Austragskegel in optimaler Weise erreicht wird.The object of the present invention is to provide a polyurethane mixing head, with which a material discharge with a desired Austragskegel is achieved in an optimal manner.

Diese Aufgabe wird alternativ durch die im Anspruch 1 bzw. durch die im Anspruch 13 angegebenen Merkmale gelöst.This object is achieved alternatively by the features specified in claim 1 and by the features specified in claim 13.

Im Gegensatz zum Stand der Technik gemäß der EP 0 389 014 B1 ist der Drallkörper der Düse des Polyurethan-Mischkopfes im wesentlichen scheiben- oder plattenförmig ausgebildet und weist einen darauf angeordneten Ringsteg auf. Der scheiben- oder plattenförmig ausgebildete Teil besitzt radial außerhalb des Ringstegs zumindest eine, vorzugsweise aber mehrere, Durchbruchsöffnungen. Diese können in Form von Bohrungen oder Nuten vorgesehen sein. Der Ringsteg ist überdies zumindest an einer Stelle, vorzugsweise jedoch an mehreren Stellen, radial von außen nach innen durch zumindest eine gerade oder spiralförmig ausgebildete Nut durchbrochen. Überdies ist der Drallkörper sowie der Düseneinsatz derart im Düsenkörper angeordnet und der Düsenkörper derart ausgebildet, dass i) zwischen dem Materialzulauf und der zumindest einen Durchbruchsöffnung eine Strömungsverbindung besteht, ii) radial außerhalb des Ringstegs sowie zwischen dem im Wesentlichen scheiben- oder plattenförmig ausgebildeten Teil und dem Düseneinsatz ein Ringkanal gebildet ist, der mit der zumindest einen Durchbruchsöffnung in Strömungsverbindung steht, iii) radial innerhalb des Ringstegs die Drallkammer ausgebildet ist, iv) die Drallkammer über zumindest eine gerade oder spiralförmig ausgebildete Nut mit dem Ringkanal in Strömungsverbindung steht.In contrast to the prior art according to the EP 0 389 014 B1 the swirl body of the nozzle of the polyurethane mixing head is substantially disc-shaped or plate-shaped and has an annular web arranged thereon. The disk-shaped or plate-shaped part has radially outside the annular web at least one, but preferably a plurality of openings. These can be provided in the form of holes or grooves. The ring land is also broken at least at one point, but preferably at several points, radially from outside to inside by at least one straight or spiral groove. Moreover, the swirl body and the nozzle insert is arranged in the nozzle body and the nozzle body is formed such that i) between the material inlet and the at least one opening opening there is a flow connection, ii) radially outside of the ring land and between the substantially disc-shaped or plate-shaped part and the nozzle insert, an annular channel is formed, which is in flow communication with the at least one aperture opening, iii) radially within the annular web, the swirl chamber is formed, iv) the swirl chamber is in flow communication via at least one straight or spiral groove formed with the annular channel.

Mit einer solchermaßen ausgebildeten Düse wird ein Austragsmaterial über einen Materialzulauf dem Düsenkörper zugeführt. Vom Materialzulauf fließt das Material in Richtung der Durchbruchsöffnungen. Über die Durchbruchsöffnungen tritt es in den Ringraum außerhalb des Ringstegs ein. Von dort tritt es über die im wesentlichen spiralförmig ausgebildeten Nuten in die Drallkammer ein. Dabei wird das Austragsmaterial bewegungsmäßig mit einer Drallkomponente versehen und erhält eine rotatorische Geschwindigkeitskomponente. Von der Drallkammer wird das Austragsmaterial dann über die Düsenbohrung ausgesprüht. Aufgrund der Drallkomponente sowie der Form der Düsenbohrung entsteht ein optimaler Austragskegel.With such a nozzle formed, a discharge material is supplied to the nozzle body via a material supply. From the material inlet, the material flows in the direction of the breakthrough openings. About the breakthrough openings, it enters the annulus outside of the ring land. From there it enters the swirl chamber via the essentially spiral-shaped grooves. In this case, the Austragsmaterial is provided in terms of movement with a swirl component and receives a rotational velocity component. From the swirl chamber, the discharge material is then sprayed through the nozzle bore. Due to the swirl component and the shape of the nozzle bore, an optimal discharge cone is created.

Bei den Tests mit der vorliegend beschriebenen Düse sind hervorragende Sprühergebnisse erzielt worden. Dies wird unter anderem darauf zurückgeführt, dass durch die im wesentlichen vollständig radial verlaufende Überführung vom Ringsteg in die Drallkammer eine besonders gute Drallwirkung erzielt wird.In the tests with the nozzle described herein, excellent spraying results have been achieved. This is attributed inter alia to the fact that a particularly good swirl effect is achieved by the substantially completely radially extending transfer from the annular web into the swirl chamber.

Die Durchbruchsöffnungen können, wie vorgenannt bereits erwähnt, in Form von Bohrungen, aber auch von randseitigen Nuten in dem im wesentlichen scheiben- oder plattenförmig ausgebildeten Teil des Drallkörpers realisiert sein. Dabei sind sowohl die Bohrungen, wie auch die Nuten recht einfach herzustellen. Als besonders vorteilhaft hat es sich erwiesen, wenn bereits die Durchbruchsöffnungen mit einer Neigung gegenüber der Senkrechten des scheiben- oder plattenförmig ausgeführten Teils realisiert sind. In diesem Fall wird dem Austragsmaterial bereits beim Durchtritt durch die Durchbruchsöffnungen und beim Einströmen in den radial äußeren Ringkanal eine Drallkomponente mitgegeben. Natürlich sollte in einem solchen Fall die Neigung der Durchbruchsöffnungen und die Form der spiralförmigen Nuten derart aufeinander abgestimmt ausgebildet werden, dass sich die Drallwirkungen verstärken. Um die Möglichkeit zur Ausbildung eines Dralleffekts sowohl im radial äußeren Ringraum wie auch in der Drallkammer zu verstärken, sind die Durchbruchsöffnungen sowie die spiralförmig ausgebildeten Nuten vorzugsweise umfangsmäßig gegeneinander versetzt. Auf diese Weise wird vermieden, dass das durch die Durchbruchsöffnungen hindurchtretende Ausgangsmaterial unmittelbar auch gleich durch die spiralförmigen Nuten hindurchströmen, ohne zuvor in Umfangsrichtung den radial äußeren Ringkanal zumindest teilweise zu durchströmen.The breakthrough openings can, as already mentioned above, be realized in the form of bores, but also of peripheral grooves in the essentially disc-shaped or plate-shaped part of the swirl body. Both the holes, as well as the grooves are quite easy to produce. It has proven to be particularly advantageous if the breakthrough openings are already realized with an inclination relative to the vertical of the disk-shaped or plate-shaped part. In this case, a swirl component is already given to the discharge material as it passes through the breakthrough openings and when flowing into the radially outer annular channel. Of course, in such a case, the inclination of the apertures and the shape of the helical grooves should be made coordinated with each other so as to enhance the swirling effects. In order to increase the possibility of forming a swirl effect both in the radially outer annular space and in the swirl chamber, the breakthrough openings and the spirally formed grooves are preferably circumferentially offset from each other. In this way, it is avoided that the starting material passing through the apertures openings immediately immediately through the spiral grooves flow through, without first in the circumferential direction to flow through the radially outer annular channel at least partially.

Natürlich sollte die vorliegende Düse besonders einfach, montage- und servicefreundlich aufgebaut sein. Dies ist dadurch gewährleistet, dass sowohl der Drallkörper wie auch der Düseneinsatz prinzipiell entnehmbar sind. Gemäß einer bevorzugten Ausführungsform ist der Düseneinsatz in den Düsenkörper einschraubbar, wobei durch das Einschrauben des Düseneinsatzes in den Düsenkörper der Drallkörper im Düsenkörper gehalten wird. Auf diese Art und Weise können der Düsenkörper, der Drallkörper und der Düseneinsatz separat hergestellt und dann auf einfachste Weise montiert werden. Auch ist die Service- und Wartungsfreundlichkeit gegeben, da durch einfaches Herausschrauben des Düseneinsatzes auch der Drallkörper entnommen werden kann und alle Elemente leicht zu reinigen sind. Der Drallkörper lässt sich dann leicht in den Düsenkörper einsetzen, wenn der Hohlraum in Form einer sich von außen nach innen verengenden Bohrung, insbesondere einer Stufenbohrung, ausgebildet ist. Der Drallkörper kann an der Wand des Hohlraums aufliegen oder an einer Stufe abgestützt zur Anlage kommen.Of course, the present nozzle should be particularly simple, easy to install and service friendly. This is ensured by the fact that both the swirl body and the nozzle insert are in principle removable. According to a preferred embodiment, the nozzle insert is screwed into the nozzle body, being held by screwing the nozzle insert into the nozzle body of the swirl body in the nozzle body. In this way, the nozzle body, the swirler and the nozzle insert can be made separately and then mounted in the simplest way. The ease of service and maintenance is given, since by simply unscrewing the nozzle insert and the swirl body can be removed and all elements are easy to clean. The swirl body can then be easily inserted into the nozzle body when the cavity in the form of a narrowing from the outside inward bore, in particular a stepped bore is formed. The swirler can rest against the wall of the cavity or be supported on a step.

Weitere Ausführungsformen sind in den Unteransprüchen definiert.Further embodiments are defined in the subclaims.

Die vorliegende Erfindung wird nachfolgend und mit Bezug auf die beigefügten Zeichnungen näher erläutert. Die Zeichnungen zeigen in:

Fig. 1:
eine schematische Teilschnittdarstellung einer an einer Mischkopflanze angeordneten erfindungsgemäßen Sprühdüse,
Fig. 2:
eine Perspektivschnittdarstellung durch die Sprühdüse für den erfindungsgemäßen Mischkopf aus Fig. 1 und
Fig. 3:
eine Perspektivansicht der Sprühdüse aus Fig. 1 in Explosivansicht.
The present invention will be explained below with reference to the accompanying drawings. The drawings show in:
Fig. 1:
FIG. 2 a schematic partial sectional view of a spray nozzle according to the invention arranged on a mixing head lance; FIG.
Fig. 2:
a perspective sectional view through the spray nozzle for the inventive mixing head Fig. 1 and
3:
a perspective view of the spray nozzle Fig. 1 in explosive view.

In der nachfolgenden Beschreibung wird lediglich die Sprühdüse für einen Sprühkopf dargestellt. Eine solche Sprühdüse ist an einer Mischkopflanze 10 befestigt, welche an einem nicht näher dargestellten Mischkopf einer Polyurethan-Anlage angeordnet ist. Eine solche Anlage - inklusive eines solchen Mischkopfes - kann beispielsweise aus Fig. 1 der EP 0 389 014 B1 entnommen werden. Dabei sind einem solchen Mischkopf in der Regel zwei reaktive Ausgangsmaterialien, beispielsweise Polyol und Isocyanat, zugeführt. Diese Materialien werden dann im Mischkopf miteinander vermischt und anschließend ausgetragen. Über die Sprühdüse kann das reaktive Austragsgemisch dann auf eine Oberfläche aufgebracht werden, wo es ausreagiert und eine Kunststoff-Haut bildet.In the following description, only the spray nozzle for a spray head is shown. Such a spray nozzle is attached to a mixing head lance 10, which is arranged on a mixing head, not shown, a polyurethane system. Such a system - including such a mixing head - can for example Fig. 1 of the EP 0 389 014 B1 be removed. As a rule, such a mixing head is supplied with two reactive starting materials, for example polyol and isocyanate. These materials are then mixed together in the mixing head and then discharged. Via the spray nozzle, the reactive Austragsgemisch can then be applied to a surface where it reacts and forms a plastic skin.

Entsprechend der Oberflächenausgestaltung kann diese Haut mit einer genabten Oberfläche oder einer anderweitig strukturierten Oberfläche ausgebildet sein. Diese Häute können durch Hinterspritzen oder Hinterschäumen weiterverarbeitet werden, wobei die Häute an sich die dekorativen Oberflächen bilden.According to the surface configuration, this skin may be formed with a ridged surface or an otherwise structured surface. These skins can be further processed by injection molding or foam back, the skins themselves form the decorative surfaces.

Zum Ausbilden einer qualitativ guten Polyurethan-Haut ist es erforderlich, das Austragsmaterial mit optimaler Verteilung und in optimaler Tröpfchengröße auf die besagte Formoberfläche aufzusprühen. Zu diesem Zweck ist an dem - nicht dargestellten - Mischkopf zunächst eine Mischkopflanze 10 angeordnet, an deren unteren Ende (vorliegend über ein Adapterstück 12) eine Sprühdüse befestigt ist. Die Mischkopflanze 10 ermöglicht es, auch unzugängliche Stellen, zu denen der Mischkopf ansonsten nicht vordringen könnte, zu besprühen.To form a good quality polyurethane skin, it is necessary to spray the discharge material with optimal distribution and in optimal droplet size on said mold surface. For this purpose, a mixing head lance 10 is initially arranged on the mixing head - not shown - at the lower end of which (in the present case an adapter piece 12) a spray nozzle is attached. The mixing head lance 10 makes it possible to spray even inaccessible areas to which the mixing head otherwise could not penetrate.

Die Mischkopflanze 10 ist mit einem zentralen Strömungskanal versehen, durch den Austragsmaterial vom Mischkopf über den Sprühkopfanschluss zur Sprühdüse hindurchströmt. Vorliegend schließt sich an das strömungsabwärtsseitige Ende der Mischkopflanze 10 das Adapterstück 12 an, welches an der Mischkopflanze 10 mittels einer Überwurfmutter derart befestigt ist, dass das Austragsmaterial über den zentralen Kanal in der Mischkopflanze unmittelbar in den dazu fluchtend ausgebildeten Strömungskanal des Adapterstücks 12 fließt. Am austragsseitigen Ende des Adapterstücks 12 ist ein Außengewinde angeordnet, an dem ein Düsenkörper der Sprühdüse aufgeschraubt werden kann. Zu diesem Zweck ist an einem Befestigungsflansch 30 der Sprühdüse ein Innengewinde 32 angeordnet.The mixing head lance 10 is provided with a central flow passage through which discharge material flows from the mixing head via the spray head port to the spray nozzle. In the present case, adjoining the downstream end of the mixing head lance 10 is the adapter piece 12, which is fastened to the mixing head lance 10 by means of a union nut in such a way that the discharge material flows via the central channel in the mixing head lance flows directly into the aligned flow channel of the adapter piece 12. At the discharge end of the adapter piece 12, an external thread is arranged, on which a nozzle body of the spray nozzle can be screwed. For this purpose, an internal thread 32 is arranged on a mounting flange 30 of the spray nozzle.

Die Sprühdüse ist vorliegend im wesentlichen zylindrisch ausgebildet und weist senkrecht zu deren Längsachse eine mit zwei Stufen 34 und 36 versehene Stufen-Bohrung auf. Die Stufen-Bohrung verengt sich über die Stufen 34 und 36 von außen nach innen, wobei die Stufen 34 und 36 insgesamt Ringabsätze bzw. -auflagen bilden.The spray nozzle is presently substantially cylindrical and has perpendicular to the longitudinal axis of a provided with two stages 34 and 36 step bore. The step bore narrows through the steps 34 and 36 from outside to inside, wherein the steps 34 and 36 form a total annular heels or -auflagen.

Auf der innersten Stufe 36 stützt sich radial außen ein Drallkörper 18 ab. Dieser Drallkörper 18 wird durch den Düseneinsatz 16 im Anschlag an die Stufe 36 gehalten. Der Düseneinsatz 16 ist im wesentlichen scheiben- oder becherförmig mit einer zentralen Düsenbohrung 26 ausgebildet und besitzt an seinem radialen Außenumfang ein Gewinde 42. Mit diesem Gewinde kann der Düseneinsatz 16 in die Stufen-Bohrung eingeschraubt werden, welche an dieser Stelle ein Innengewinde aufweist. Beim vollständig eingeschraubten Düseneinsatz 16 lagert sich deren unteres Ende an dem Drallkörper 18 an und hält dieses fest in dem Düsenkörper 14.On the innermost stage 36, a swirl body 18 is supported radially on the outside. This swirler 18 is held by the nozzle insert 16 in abutment against the step 36. The nozzle insert 16 is formed substantially disc-shaped or cup-shaped with a central nozzle bore 26 and has at its radial outer periphery a thread 42. With this thread, the nozzle insert 16 can be screwed into the step bore, which has an internal thread at this point. When the nozzle insert 16 is completely screwed in, its lower end adjoins the swirl body 18 and holds it firmly in the nozzle body 14.

Der Drallkörper 18 besitzt einen im wesentlichen scheibenförmigen zentralen Teil, der durch vier Randnuten 44 durchbrochen ist. Die Randnuten weisen dabei eine Neigung gegenüber der Senkrechten zum scheibenförmigen Teil auf. Auf dem scheibenförmigen Teil ist ein Ringsteg 46 angeordnet, der ebenfalls von vier, von radial außen nach radial innen verlaufenden Nuten 48 durchbrochen ist. Die Nuten können gerade oder spiralförmig angeordnet sein. Der Ringsteg 46 ist an seiner oberen, vom scheibenförmigen Teil abgewandten Seite plan ausgebildet, so dass er dicht auf der Unterseite des Düseneinsatzes 16 aufliegen kann. Innerhalb des Ringstegs 46 ist eine Drallkammer 24 ausgebildet, die in die Düsenbohrung 26 mündet.The swirl body 18 has a substantially disc-shaped central part, which is broken by four edge grooves 44. The peripheral grooves have an inclination relative to the perpendicular to the disk-shaped part. On the disk-shaped part, an annular web 46 is arranged, which is also broken by four, from radially outward to radially inwardly extending grooves 48. The grooves may be straight or spiral. The annular rib 46 is formed flat at its upper, side facing away from the disc-shaped part side, so that it can rest tightly on the underside of the nozzle insert 16. Within the annular web 46, a swirl chamber 24 is formed in the nozzle bore 26th empties.

Zum Ein- und Ausschrauben des Düseneinsatzes 16 sind noch zwei Eingriffsnuten 40 vorgesehen, in denen ein entsprechendes Werkzeug zum Festziehen oder zum Lockern des Düseneinsatzes 16 angesetzt werden kann.For screwing and unscrewing the nozzle insert 16 two engagement grooves 40 are still provided, in which a corresponding tool for tightening or loosening of the nozzle insert 16 can be recognized.

Der soeben beschriebene Aufbau ist insbesondere aus Fig. 3 besonders gut zu erkennen.The structure just described is in particular made Fig. 3 particularly easy to recognize.

Die Funktionsweise der vorliegenden, erfindungsgemäßen Düse soll nun - insbesondere mit Bezug zu den Figuren 1 und 2 - erläutert werden.The mode of operation of the present nozzle according to the invention will now be described, in particular with reference to FIGS FIGS. 1 and 2 - be explained.

Das von einem nicht dargestellten Mischkopf zur Verfügung gestellte, reaktive Material wird über den zentralen Kanal der Mischkopflanze 10 und des Adapterstücks 12 der Sprühdüse zugeführt. In der Sprühdüse fließt das reaktive Material über einen Materialzulauf in eine strömungsmäßig vor dem Drallkörper 18 befindliche Einströmkammer 20. Von der Einströmkammer 20 fließt das Material über die vier Randnuten 44 in den radial außerhalb des Ringstegs 46 und zwischen dem Düseneinsatz 16, dem plattenförmigen Teil des Drallkörpers 18 und dem Düsenkörper gebildeten Ringraum 28.The provided by a mixing head, not shown, reactive material is supplied via the central channel of the mixing head lance 10 and the adapter piece 12 of the spray nozzle. In the spray nozzle, the reactive material flows through a material inlet into a flow in front of the swirler 18 inflow chamber 20. From the inflow chamber 20, the material flows through the four edge grooves 44 in the radially outside of the annular ridge 46 and between the nozzle insert 16, the plate-shaped part of Swirl body 18 and the nozzle body formed annular space 28th

Bereits beim Durchtritt des Materials durch die Randnuten 44 in den Ringraum 28 wird dem Material eine erste Drallbewegung mitgegeben. Da - wie in Fig. 3 zu erkennen ist - die randseitigen Nuten 44 sowie die den Ringsteg 46 durchbrechenden Nuten 48 umfangsmäßig versetzt angeordnet sind, muss das Material im Ringkanal 28 zunächst in Umfangsrichtung fließen. Hier wird dem Material noch mal ein weiterer Drall mitgegeben.Already during the passage of the material through the edge grooves 44 in the annular space 28, the material is given a first twisting motion. There - as in Fig. 3 can be seen - the peripheral grooves 44 and the annular ridge 46 by intersecting grooves 48 are arranged circumferentially offset, the material in the annular channel 28 must first flow in the circumferential direction. Here the material is given another twist.

Anschließend tritt das Material durch die spiralförmigen Nuten 48 in die Drallkammer 24 ein, wobei es beim Durchtritt durch die spiralförmigen Nuten 48 nochmals zu einer Erhöhung des Dralls kommt. Das in der Drallkammer 24 befindliche Material ist somit über die randseitigen Nuten 44, dem Durchlaufen des Ringkanals 28 sowie die spiralförmigen Nuten 48 in eine entsprechende Drallbewegung versetzt worden und tritt aus der Drallkammer über die Düsenbohrung 26 an die Außenumgebung aus.Subsequently, the material enters through the spiral grooves 48 in the swirl chamber 24, wherein it comes on passing through the spiral grooves 48 again to an increase of the twist. That in the Swirl chamber 24 material has thus been placed on the peripheral grooves 44, the passage of the annular channel 28 and the spiral grooves 48 in a corresponding swirling motion and exits the swirl chamber through the nozzle bore 26 to the outside environment.

Aufgrund des mitgegebenen Dralls kommt es zu einer optimalen Ausbildung eines Sprühkegels mit einer guten Verteilung der Tröpfchen sowohl in ihrer Größe wie auch in der Form des Sprühkegels selbst.Due to the imparted twist, there is an optimal design of a spray cone with a good distribution of the droplets both in size and in the shape of the spray cone itself.

Insgesamt wird durch die vorliegend ausgebildete Düse eine einfach aufgebaute, leicht zu reinigende und kostengünstig herzustellende Düse zur Verfügung gestellt, die optimale Sprühergebnisse liefert.Overall, the presently formed nozzle provides a simply constructed, easy-to-clean and cost-effective nozzle that provides optimal spray results.

Claims (24)

  1. A polyurethane mixing head with a spray head nozzle, comprising a nozzle body (14) with a cavity, which is able to be supplied with discharge material via a material inlet (22) and in which a swirl body (18) is arranged, on which a nozzle insert (16) is arranged with a nozzle bore (26), via which the discharge material can be sprayed out, in which the swirl body (18) and the nozzle insert (16) are arranged in the nozzle body (14) such that a swirl chamber (24) is covered by the nozzle insert (16), such that during operation the discharge material emerges from the swirl chamber (24) via the nozzle bore (26),
    characterized in that
    the swirl chamber (18) has a disc- or plate-shaped part on which an annular web (46) is arranged, in which
    - the disc-or plate-shaped part is interrupted by at least one opening (44) arranged radially outside the annular web (46),
    - the annular web (46) is interrupted at at least one point radially from the outside to the inside by at least one straight or helically shaped groove (48) and
    - the swirl body (18) and the nozzle insert (16) are in addition arranged in the nozzle body (14) such that, and the nozzle body (14) is constructed such that
    - a flow connection exists between the material inlet (22) and the at least one through opening (44),
    - radially outside the annular web (46) and between the disc- or plate-shaped part and the nozzle insert (16) an annular channel (28) is formed, which is in flow connection with the at least one through opening (44),
    - the swirl chamber (24) is constructed radially inside the annular web (46),
    - the swirl chamber (24) is in flow connection with the annular channel (28) via the at least one straight or helically shaped groove (48).
  2. The polyurethane mixing head according to Claim 1,
    characterized in that
    a plurality of through openings (44) are arranged in circumferential direction of the disc- or plate-shaped part.
  3. The polyurethane mixing head according to Claim 1 or 2,
    characterized in that
    the through openings (44) are constructed in the form of grooves on the edge side.
  4. The polyurethane mixing head according to any of the preceding claims,
    characterized in that
    the through openings (44) are formed with an inclination with respect to a vertical onto the disc- or plate-shaped part such that the material is able to be introduced with a velocity component in circumferential direction of the annular channel (28) into the latter.
  5. The polyurethane mixing head according to any of the preceding claims,
    characterized in that
    a plurality of helically shaped grooves (48) is provided.
  6. The polyurethane mixing head according to any of the preceding claims,
    characterized in that
    the inclination of the through openings (44) and the alignment of the helically shaped grooves (48) are selected in the same swirl-producing direction.
  7. The polyurethane mixing head according to any of the preceding claims,
    characterized in that
    the through openings (44) are staggered circumferentially with respect to the helically constructed grooves (48).
  8. The polyurethane mixing head according to any of the preceding claims,
    characterized in that
    the nozzle insert (16) is constructed so as to be able to be screwed into the nozzle body (14).
  9. The polyurethane mixing head according to any of the preceding claims,
    characterized in that
    the cavity is constructed in the form of a bore, narrowing from the outside to the inside, in particular a stepped bore, with the swirl body (18) coming to abut the wall of the cavity in a supported manner.
  10. The polyurethane mixing head according to any of the preceding claims,
    characterized in that
    the swirl body (18) is held by the nozzle insert (16) in the nozzle body (14).
  11. The polyurethane mixing head according to any of the preceding claims,
    characterized in that
    the discharge direction out of the nozzle bore (26) is aligned substantially perpendicularly to the longitudinal axis of the nozzle body (14).
  12. The polyurethane mixing head according to any of the preceding claims,
    characterized in that
    the swirl body (18) and the nozzle insert (16) are constructed in one piece.
  13. The use of a nozzle for a spray head of a polyurethane mixing head, comprising a nozzle body (14) with a cavity, which is able to be supplied with discharge material via a material inlet (22) and in which a swirl body (18) is arranged, on which a nozzle inert (16) is arranged with a nozzle bore (26), via which the discharge material can be sprayed out, in which the swirl body (18) and the nozzle insert (16) are arranged in the nozzle body (14) such that a swirl chamber (24) is covered by the nozzle insert (16), such that, during operation, the discharge material emerges from the swirl chamber (24) via the nozzle bore (26),
    characterized in that
    the swirl body (18) has a disc- or plate-shaped part on which an annular web (46) is arranged, in which
    - the disc- or plate-shaped part is interrupted by at least one opening (44) arranged radially outside the annular web (46),
    - the annular web (46) is interrupted at at least one point radially from the outside to the inside by at least one straight or helically shaped groove (48) and
    - the swirl body (18) and the nozzle insert (16) are in addition arranged in the nozzle body (14) such that, and the nozzle body (14) is arranged such that
    - a flow connection exists between the material inlet (22) and the at least one through opening (44),
    - radially outside the annular web (46) and between the disc- or plate-shaped part and the nozzle insert (16) an annular channel (28) is formed, which is in flow connection with the at least one through opening (44),
    - the swirl chamber (24) is constructed radially inside the annular web (46),
    - the swirl chamber (24) is in flow connection with the annular channel (28) via the at least one straight or helically shaped groove (48).
  14. The use of a nozzle according to Claim 13,
    characterized in that
    a plurality of through openings (44) are arranged in the circumferential direction of the disc- or plate-shaped part.
  15. The use of a nozzle according to Claim 13 or 14,
    characterized in that
    the through openings (44) are constructed in the form of grooves on the edge side.
  16. The use of a nozzle according to any of the preceding Claims 13 to 15,
    characterized in that
    the through openings (44) are constructed with an inclination with respect to a vertical onto the disc- or plate-shaped part such that the material is able to be introduced with a velocity component in circumferential direction of the annular channel (28) into the latter.
  17. The use of a nozzle according to any of the preceding Claims 13 and 16,
    characterized in that
    a plurality of helically shaped grooves (48) is provided.
  18. The use of a nozzle according to any of the preceding Claims 13 to 17,
    characterized in that
    the inclination of the through openings (44) and the alignment of the helically shaped grooves (48) are selected in the same swirl-producing direction.
  19. The use of a nozzle according to any of the preceding Claims 13 to 18,
    characterized in that
    the through openings (44) are staggered circumferentially with respect to the helically shaped grooves (48).
  20. The use of a nozzle according to any of the preceding Claims 13 to 19,
    characterized in that
    the nozzle insert (16) is constructed so as to be able to be screwed into the nozzle body (14).
  21. The use of a nozzle according to any of the preceding Claims 13 to 20,
    characterized in that
    the cavity is constructed in the form of a bore narrowing from the outside to the inside, in particular a stepped bore, with the swirl body (18) coming to abut the wall of the cavity in a supported manner.
  22. The use of a nozzle according to any of the preceding Claims 13 to 21,
    characterized in that
    the swirl body (18) is held by the nozzle insert (16) in the nozzle body (14).
  23. The use of a nozzle according to any of the preceding Claims 13 to 22,
    characterized in that
    the discharge direction out of the nozzle bore (26) is aligned substantially perpendicularly to the longitudinal axis of the nozzle body (14).
  24. The use of a nozzle according to any of the preceding Claims 13 to 23,
    characterized in that
    the swirl body (18) and the nozzle insert (16) are constructed in one piece.
EP06777591A 2005-08-11 2006-07-05 Mixing head Not-in-force EP1915216B8 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06777591T PL1915216T3 (en) 2005-08-11 2006-07-05 Mixing head

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005037972A DE102005037972A1 (en) 2005-08-11 2005-08-11 Nozzle for spray head
PCT/EP2006/063904 WO2007017319A1 (en) 2005-08-11 2006-07-05 Nozzle for a spray head

Publications (3)

Publication Number Publication Date
EP1915216A1 EP1915216A1 (en) 2008-04-30
EP1915216B1 true EP1915216B1 (en) 2009-03-11
EP1915216B8 EP1915216B8 (en) 2009-07-01

Family

ID=36888995

Family Applications (1)

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EP06777591A Not-in-force EP1915216B8 (en) 2005-08-11 2006-07-05 Mixing head

Country Status (10)

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US (1) US20080142620A1 (en)
EP (1) EP1915216B8 (en)
KR (1) KR20080032055A (en)
CN (1) CN101237940B (en)
AT (1) ATE424930T1 (en)
DE (2) DE102005037972A1 (en)
ES (1) ES2322201T3 (en)
PL (1) PL1915216T3 (en)
PT (1) PT1915216E (en)
WO (1) WO2007017319A1 (en)

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WO2007017319A1 (en) 2007-02-15
CN101237940A (en) 2008-08-06
ATE424930T1 (en) 2009-03-15
KR20080032055A (en) 2008-04-14
PT1915216E (en) 2009-04-24
EP1915216B8 (en) 2009-07-01
PL1915216T3 (en) 2009-08-31
DE502006003113D1 (en) 2009-04-23
ES2322201T3 (en) 2009-06-17
DE102005037972A1 (en) 2007-02-22
EP1915216A1 (en) 2008-04-30
CN101237940B (en) 2010-11-17
US20080142620A1 (en) 2008-06-19

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