EP2286925B1 - Static spray mixer - Google Patents

Static spray mixer Download PDF

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Publication number
EP2286925B1
EP2286925B1 EP10167599.9A EP10167599A EP2286925B1 EP 2286925 B1 EP2286925 B1 EP 2286925B1 EP 10167599 A EP10167599 A EP 10167599A EP 2286925 B1 EP2286925 B1 EP 2286925B1
Authority
EP
European Patent Office
Prior art keywords
mixer
mixer housing
distal end
static spray
accordance
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.)
Active
Application number
EP10167599.9A
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German (de)
French (fr)
Other versions
EP2286925A3 (en
EP2286925A2 (en
Inventor
Andreas Hiemer
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.)
Medmix Switzerland AG
Original Assignee
Sulzer Mixpac AG
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Publication date
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Priority to EP10167599.9A priority Critical patent/EP2286925B1/en
Publication of EP2286925A2 publication Critical patent/EP2286925A2/en
Publication of EP2286925A3 publication Critical patent/EP2286925A3/en
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Publication of EP2286925B1 publication Critical patent/EP2286925B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4321—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa the subflows consisting of at least two flat layers which are recombined, e.g. using means having restriction or expansion zones
    • 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
    • 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
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00553—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with means allowing the stock of material to consist of at least two different components
    • 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 invention relates to a static spray mixer for mixing and spraying of at least two flowable components according to the preamble of the independent claim.
  • Static mixers for mixing at least two flowable components are for example in the EP-A-0 749 776 and in the EP-A-0 815 929 described. Despite their simple, material-saving construction of their mixer structure, these very compact mixers produce good mixing results, especially when mixing highly viscous substances such as sealants, two-component foams, or two-component adhesives. Typically, such static mixers are designed for single use and are often used for curing products in which the mixer practically can not be cleaned.
  • the two components are atomized at the outlet of the mixer by exposure to a medium such as air and can then be applied in the form of a spray or spray on the desired substrate.
  • a medium such as air
  • Such a device is for example in the US-B-6,951,310 disclosed.
  • a tubular mixer housing which receives the mixing element for the static mixture and which on one end has an external thread on which an annular nozzle body is screwed.
  • the nozzle body also has an external thread.
  • a cone-shaped Zerstäuberelement is placed, which has on its conical surface a plurality of longitudinal grooves.
  • a cap is inverted, the inner surface is also designed conical, so that it rests against the conical surface of the atomizer. Consequently, the grooves form flow channels between the atomizer element and the cap.
  • the cap is fixed together with the atomizer element by means of a union nut, which is screwed onto the external thread of the nozzle body, on the nozzle body.
  • the nozzle body has a connection for compressed air. In operation, the compressed air flows from the nozzle body through the flow channels between the atomizer element and the cap and atomizes the material emerging from the mixing element.
  • a nozzle for atomizing a liquid in which the liquid is mixed with gas comprising a one-piece housing extending in the direction of a longitudinal axis to a distal end with an outlet opening, and a sputtering sleeve having an inner surface which the housing encloses in its end region, wherein the atomizing sleeve has an inlet for a pressurized atomizing medium is in EP 0 904 844 A1 described.
  • US 6,601,782 describes a spray nozzle assembly having a tubular, one-piece mixer housing extending in the direction of a longitudinal axis to a distal end with an outlet opening with a mixing element disposed in the mixer housing and a sputtering sleeve having an inner surface enclosing the mixer housing in its end region wherein the sputtering sleeve has an inlet for a pressurized sputtering medium.
  • a static spray mixer for mixing and spraying at least two flowable components, comprising a tubular, one-piece mixer housing which extends in the direction of a longitudinal axis up to a distal end which has an outlet opening for the components, with at least one in the Mixer element arranged to mix the components and with a sputtering sleeve having an inner surface which encloses the mixer housing in its end region, wherein the sputtering sleeve has an inlet for a pressurized sputtering medium.
  • a plurality of extending in the direction of the longitudinal axis grooves are provided through which the sputtering medium from the inlet of the sputtering sleeve to the distal end of the mixer housing can flow.
  • the inventive static spray mixer requires only three components, namely the one-piece mixer housing, the atomizer sleeve and the mixing element, which may also be configured in one piece. This results in a significant reduction in complexity compared to known devices and a much simpler manufacture or assembly.
  • each groove has a depth in the radial direction that increases toward the distal end of the mixer housing.
  • the mixer housing has a distal end portion that tapers toward the distal end. This rejuvenation improves the atomization effect.
  • the inner surface of the atomizing sleeve is configured to cooperate with the distal end portion.
  • the atomizing sleeve is connected thread-free with the mixer housing.
  • the outer surface of the mixer housing in the distal end region is at least partially designed as a frustoconical surface.
  • the truncated cone surface forms a cone angle with the longitudinal axis, which is at least 10 ° and at most 45 °.
  • annular space is preferably provided between the outer surface of the mixer housing and the inner surface of the Zerstäubungshüles, which is in fluid communication with the inlet of the atomizing sleeve and with the grooves.
  • each groove in the radial direction has a depth which is smaller, in particular at most half as large as the extension of the respective groove in the direction perpendicular to the longitudinal axis and the radial direction.
  • the atomizing sleeve is fastened by means of a sealing snap connection on the mixer housing.
  • the mixer housing has a substantially rectangular, preferably square, cross-sectional area perpendicular to the longitudinal axis outside the distal end region. This allows the proven mixers, available under the brand name Quadro®, to be used for the static spray mixer.
  • the mixing element is rectangular, preferably square, perpendicular to the longitudinal direction, as is the case with the Quadro® mixers.
  • the inlet of the atomizing sleeve preferably has fixing means for a supply for the atomizing agent.
  • the mixer housing and / or the atomizing sleeve are injection-molded, preferably made of a thermoplastic.
  • the mixing element is configured in one piece and injection-molded, preferably of a thermoplastic.
  • Fig. 1 shows a longitudinal section of a static spray mixer, which is generally designated by the reference numeral 1.
  • Fig. 2 a perspective view.
  • the spray mixer is used for mixing and spraying of at least two flowable components.
  • the spray mixer 1 comprises a tubular, one-piece mixer housing 2 which extends in the direction of a longitudinal axis A to a distal end 21.
  • the distal end 21 is meant that end at which the mixed components leave the mixer housing 2 in the operating state.
  • the distal end 21 is provided with an outlet opening 22.
  • the mixer housing 2 has a connecting piece 23, by means of which the mixer housing 2 can be connected to a reservoir for the components.
  • This reservoir can be, for example, a known two-component cartridge, designed as a coaxial or side-by-side cartridge, or two tanks in which the two components are kept separate from each other.
  • the connector configured, for example as a snap connection, as a bayonet connection, as a threaded connection or combinations thereof.
  • At least one static mixing element 3 is arranged in a manner known per se, which rests against the inner wall of the mixer housing 2, so that the two components can only pass through the mixing element 3 from the proximal end to the outlet opening 22.
  • Either several, successively arranged mixing elements 3 may be provided, or as in the present embodiment, a one-piece mixing element 3, which is preferably injection molded and consists of a thermoplastic.
  • Such static mixers or mixing elements 3 per se are well known to the person skilled in the art and therefore require no further explanation.
  • Such mixing elements are for example in the already cited documents EP-A-0 749 776 and EP-A-0 815 929 described.
  • Such a mixing element 3 of the Quadro® type has a rectangular, in particular a square cross section, perpendicular to the longitudinal direction A. Accordingly, the one-piece mixer housing 2, at least in the region in which it encloses the mixing element 3, a substantially rectangular, in particular square cross-sectional area perpendicular to the longitudinal axis A.
  • the mixing element 3 does not extend all the way to the distal end 21 of the mixer housing 2, but ends at a stop 25 (see Fig. 3 ). Seen in the flow direction up to this stop 25, the interior of the mixer housing 2 has a substantially square cross-section for receiving the mixing element 3. At this stop 25, the interior of the mixer housing 2 is in a circular cone shape, thus has a circular cross-section and forms an exit region 26 which tapers in the direction of the distal end 21 and there opens into the outlet opening 22.
  • the static spray mixer 1 further comprises a sputtering sleeve 4 having an inner surface which encloses the mixer housing 2 in its end region.
  • the atomizing sleeve 4 is designed in one piece and is preferably injection-molded, in particular made of a thermoplastic. It has an inlet 41 for a pressurized atomizing medium, which is in particular gaseous. Preferably, the atomization medium is compressed air.
  • the inlet 41 fixation means 42 for the supply of compressed air here a thread on which the connection of a compressed air hose can be screwed.
  • fixing means 42 are possible, such as a corrugation, a clamp, a crimp or crimp, a bayonet connection or the like.
  • the inlet 42 can be designed for all known connections, in particular also for a Luer lock.
  • the atomizing sleeve 4 is preferably connected thread-free with the mixer housing, in the present embodiment by means of a snap connection.
  • a flange-like elevation 24 is provided on the mixer housing 2 (see Fig. 3 ), which extends over the entire circumference of the mixer housing 2.
  • a circumferential groove 43 is provided, which is designed to cooperate with the survey 24. If the atomizing sleeve 4 is pushed over the mixer housing 2, the projection 24 snaps into the circumferential groove 43 and ensures a stable connection of the atomizing sleeve 4 to the mixer housing 2.
  • this snap connection is designed to be sealed so that the atomizing medium - in this case not compressed air can escape through this from the circumferential groove 43 and the survey 24 existing connection.
  • a plurality of grooves 5 each extending in the direction of the longitudinal axis A are provided in the inner surface of the atomizing sleeve 4 through which the atomizing medium can flow from the inlet 42 of the atomizing sleeve 4 to the distal end 21 of the mixer housing 2, even if in FIG Fig. 2 . 3 and 5 to 8 an embodiment is shown in which the grooves are shown deviating thereof only in the outer surface of the mixer housing.
  • each of the grooves 5 can run in a straight line in the direction of the longitudinal axis A or to run along the longitudinal axis A.
  • grooves 5 are provided only in the outer surface of the mixer housing 2. According to the invention, however, the grooves 5 are provided at least also in the inner surface of the atomizing sleeve 4.
  • FIGS. 3 to 8 show a perspective sectional view of the end portion of the static spray mixer, Fig. 4 a side view.
  • the Fig. 5-8 each show a cross section perpendicular to the longitudinal axis A, namely Fig. 5 along the section line VV in Fig. 4 ; Fig. 6 along the section line VI-VI; Fig. 7 along the section line VII-VII and Fig. 8 along the section line VIII-VIII in Fig. 4 ,
  • the mixer housing 2 has a distal end portion 27, which tapers toward the distal end 21.
  • the outer surface of the mixer housing in the distal end region 27 is at least partially formed as a frustoconical surface.
  • the cone angle ⁇ which forms the outer surface of the mixer housing 2 in the distal end region 27 with the longitudinal axis A, is at least 10 ° and at most 45 °. This cone angle ⁇ is in general different from and especially smaller than the cone angle with which the output region 26 tapers in the interior of the mixer housing 2.
  • the inner surface of the atomizing sleeve 4 is configured to cooperate with the distal end portion 27.
  • the inner surface of the atomizing sleeve 4 is also designed as a frustoconical surface having the same cone angle ⁇ as the outer surface of the mixer housing 2 in this region K.
  • the inner surface of the atomizing sleeve 4 is initially still frusto-conical, but has a larger cross-section than the outer surface of the mixer housing 2, so that between the outer surface of the mixer housing 2 and the inner surface of the Zerstäuberhülse 4 an annular space 6 exists (see Fig. 7 ).
  • the annular space 6 is in fluid communication with the inlet 41 of the atomizer sleeve 4.
  • the inner surface of the sputtering sleeve 4 is in a substantially circular cylindrical shape, whereby also the annular space 6 exists.
  • the annular space 6 is limited on its side remote from the distal end 21 by the elevation 24, which engages sealingly in the circumferential groove 43.
  • the grooves 5 of the mixer housing 2 are characterized by two dimensions, namely their extension designated as depth T. in the radial direction, the radial direction meaning a direction perpendicular to the longitudinal axis A which faces radially outward from the longitudinal axis A, and its extension B is in the direction perpendicular to the longitudinal axis A and the radial direction.
  • the depth T of each groove 5 is smaller, in particular at most half as large as the extension B in the direction perpendicular to the longitudinal axis A and the radial direction at the same location.
  • the depth T is about one third of the extent B in each case.
  • a further advantageous measure consists in that the grooves 5 are each designed so that their depth T seen in the direction of flow, ie towards the distal end 21 increases. This feature is by comparing the Fig. 5-7 recognizable.
  • grooves 5 With regard to the geometry and the course of the grooves 5, of course, many other embodiments are possible.
  • the grooves 5 can also be optimized for the specific application in terms of their number, their course and their dimensions.
  • the flange-like elevation 24, the best in Fig. 3 can be seen not consistently extends over the entire circumference of the mixer housing 2, but that there are two pairs of flange-like elevations, which are offset with respect to the direction defined by the longitudinal axis A direction to each other.
  • a pair of the surveys then forms one on the according Fig. 3 according to the top and a provided on the bottom of the mixer housing 2 survey, the other pair is formed by a provided on the front and on the back elevation.
  • Each of the individual survey extends over at most one side or in a circular configuration over at most 90 ° (one quarter) of the circumference.
  • the pair on the top and bottom is offset with respect to the direction defined by the longitudinal axis A to the pair on the front and back, that is, the former pair is, for example closer to the distal end 21 of the mixer housing 2 than the latter in which the projections belonging to the same pair are each provided at the same distance from the distal end 21.
  • the circumferential groove extends 43 not over the entire inner circumference of the atomizing sleeve 4, but there are two sub-grooves, which are offset by 180 ° to each other, and their length in the circumferential direction is in each case at most as large as the length of a single survey.
  • the sputtering sleeve can be pushed onto the mixer housing in two different orientations rotated by 90 ° relative to one another. In one orientation, the sub-grooves snap into the first pair of protuberances, in the other orientation they snap into the second or other pair of protuberances. As a result of this measure, the size or the flow cross-section of the annular space 6 or of the grooves 5 can be changed so that different flows for the atomizing medium can be set.
  • this embodiment operates as follows.
  • the static spray mixer is connected by means of its connecting piece 23 to a storage vessel containing the two components separated from each other, for example with a two-component cartridge.
  • the inlet 41 of the atomizing sleeve 4 is connected to a source of atomizing medium, for example a compressed air source.
  • a source of atomizing medium for example a compressed air source.
  • the compressed air flows through the inlet 41 of the atomizing sleeve 4 into the annular space 6 between the inner surface of the atomizing sleeve 4 and the outer surface of the mixer housing 2 and from there through the grooves 5, which form flow channels, to the distal end 21 and thus to the outlet opening 22 of the mixer housing 3.
  • a particular advantage of the inventive static spray mixer 1 can be seen in its particularly simple design and manufacture.
  • the Principle requires only three parts, namely a one-piece mixer housing 2, a one-piece mixing element 3 and a one-piece atomizing sleeve 4, wherein each of these parts can be produced in a simple and economical manner by injection molding.
  • the particularly simple design also allows for - at least largely - automated assembly of the parts of the static spray mixer 1. In particular, no screwing these three parts are necessary.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)

Description

Die Erfindung betrifft einen statischen Sprühmischer zum Mischen und Sprühen von mindestens zwei fliessfähigen Komponenten gemäss dem Oberbegriff des unabhängigen Patentanspruchs.The invention relates to a static spray mixer for mixing and spraying of at least two flowable components according to the preamble of the independent claim.

Statische Mischer zum Mischen von mindestens zwei fliessfähigen Komponenten sind beispielsweise in der EP-A-0 749 776 und in der EP-A-0 815 929 beschrieben. Diese sehr kompakten Mischer liefern trotz einem einfachen, materialsparenden Aufbau ihrer Mischerstruktur gute Mischresultate, insbesondere auch beim Mischen von hochviskosen Stoffen wie beispielsweise Dichtmassen, Zweikomponenten-Schäume, oder Zweikomponenten-Klebstoffe. Üblicherweise sind solche statischen Mischer für den Einmalgebrauch ausgelegt und werden häufig für aushärtende Produkte verwendet, bei denen die Mischer praktisch nicht mehr gereinigt werden können.Static mixers for mixing at least two flowable components are for example in the EP-A-0 749 776 and in the EP-A-0 815 929 described. Despite their simple, material-saving construction of their mixer structure, these very compact mixers produce good mixing results, especially when mixing highly viscous substances such as sealants, two-component foams, or two-component adhesives. Typically, such static mixers are designed for single use and are often used for curing products in which the mixer practically can not be cleaned.

Bei einigen Anwendungen, bei denen solche statischen Mischer eingesetzt werden, ist es wünschenswert, die beiden Komponenten nach ihrer Durchmischung in dem statischen Mischer auf ein Substrat aufzusprühen. Dazu werden die durchmischten Komponenten am Ausgang des Mischers durch Beaufschlagung mit einem Medium wie beispielsweise Luft zerstäubt und können dann in Form eines Sprühstrahls oder Sprühnebels auf das gewünschte Substrat aufgebracht werden. Eine solche Vorrichtung ist beispielsweise in der US-B-6,951,310 offenbart.In some applications where such static mixers are used, it is desirable to spray the two components onto a substrate after they have been mixed in the static mixer. For this purpose, the mixed components are atomized at the outlet of the mixer by exposure to a medium such as air and can then be applied in the form of a spray or spray on the desired substrate. Such a device is for example in the US-B-6,951,310 disclosed.

Bei dieser Vorrichtung ist ein rohrförmiges Mischergehäuse vorgesehen, welches das Mischelement für die statische Mischung aufnimmt und welches an einem Ende ein Aussengewinde aufweist, auf das ein ringförmiger Düsenkörper aufgeschraubt wird. Der Düsenkörper weist ebenfalls ein Aussengewinde auf. Auf das Ende des Mischelements, das aus dem Mischergehäuse herausschaut, wird ein konusförmiges Zerstäuberelement aufgesetzt, das auf seiner Konusfläche mehrere in Längsrichtung verlaufende Nuten aufweist. Über dieses Zerstäuberelement wird eine Kappe gestülpt, deren Innenfläche ebenfalls konisch ausgestaltet ist, sodass sie an der Konusfläche des Zerstäuberelements anliegt. Folglich bilden die Nuten Strömungskanäle zwischen dem Zerstäuberelement und der Kappe. Die Kappe wird zusammen mit dem Zerstäuberelement mittels einer Überwurfmutter, die auf das Aussengewinde des Düsenkörpers aufgeschraubt wird, am Düsenkörper fixiert. Der Düsenkörper weist einen Anschluss für Druckluft auf. Im Betrieb strömt die Druckluft aus dem Düsenkörper durch die Strömungskanäle zwischen dem Zerstäuberelement und der Kappe hindurch und zerstäubt das aus dem Mischelement austretende Material.In this device, a tubular mixer housing is provided, which receives the mixing element for the static mixture and which on one end has an external thread on which an annular nozzle body is screwed. The nozzle body also has an external thread. On the end of the mixing element, which looks out from the mixer housing, a cone-shaped Zerstäuberelement is placed, which has on its conical surface a plurality of longitudinal grooves. About this Zerstäuberelement a cap is inverted, the inner surface is also designed conical, so that it rests against the conical surface of the atomizer. Consequently, the grooves form flow channels between the atomizer element and the cap. The cap is fixed together with the atomizer element by means of a union nut, which is screwed onto the external thread of the nozzle body, on the nozzle body. The nozzle body has a connection for compressed air. In operation, the compressed air flows from the nozzle body through the flow channels between the atomizer element and the cap and atomizes the material emerging from the mixing element.

Auch wenn sich diese Vorrichtung als durchaus funktionstüchtig erwiesen hat, so ist ihr Aufbau sehr komplex und die Montage ist aufwändig, sodass die Vorrichtung insbesondere im Hinblick auf den Einmalgebrauch nicht sehr wirtschaftlich ist.Although this device has proven to be quite functional, so its structure is very complex and the assembly is complex, so that the device is not very economical, especially in terms of single use.

Eine Düse zum Atomisieren einer Flüssigkeit, bei der die Flüssigkeit mit Gas durchmischt wird, mit einem einstückigen Gehäuse, das sich in Richtung einer Längsachse bis zu einem distalen Ende mit einer Austrittsöffnung erstreckt, sowie mit einer Zerstäubungshülse, die eine Innenfläche aufweist, welche das Gehäuse in seinem Endbereich umschließt, wobei die Zerstäubungshülse einen Einlass für ein unter Druck stehendes Zerstäubungmedium aufweist, ist in EP 0 904 844 A1 beschrieben. US 6,601,782 beschreibt eine Sprühdüsenanordnung mit einem rohrförmigen, einstückigen Mischergehäuse, das sich in Richtung einer Längsachse bis zu einem distalen Ende mit einer Austrittsöffnung erstreckt, mit einem in dem Mischergehäuse angeordneten Mischerelement sowie mit einer Zerstäubungshülse, die eine Innenfläche aufweist, welche das Mischergehäuse in seinem Endbereich umschließt, wobei die Zerstäubungshülse einen Einlass für ein unter Druck stehendes Zerstäubungsmedium aufweist.A nozzle for atomizing a liquid in which the liquid is mixed with gas, comprising a one-piece housing extending in the direction of a longitudinal axis to a distal end with an outlet opening, and a sputtering sleeve having an inner surface which the housing encloses in its end region, wherein the atomizing sleeve has an inlet for a pressurized atomizing medium is in EP 0 904 844 A1 described. US 6,601,782 describes a spray nozzle assembly having a tubular, one-piece mixer housing extending in the direction of a longitudinal axis to a distal end with an outlet opening with a mixing element disposed in the mixer housing and a sputtering sleeve having an inner surface enclosing the mixer housing in its end region wherein the sputtering sleeve has an inlet for a pressurized sputtering medium.

Ausgehend von diesem Stand der Technik ist es daher eine Aufgabe der Erfindung, einen besonders einfachen statischen Sprühmischer zum Mischen und Sprühen von mindestens zwei fliessfähigen Komponenten vorzuschlagen, der wirtschaftlich in der Herstellung ist und ein effizientes Durchmischen und Zerstäuben der Komponenten ermöglicht.Based on this prior art, it is therefore an object of the invention to propose a particularly simple static spray mixer for mixing and spraying of at least two flowable components, which is economical to manufacture and allows efficient mixing and atomization of the components.

Der diese Aufgabe lösenden Gegenstand der Erfindung ist durch die Merkmale des unabhängigen Patentanspruchs gekennzeichnet.The object of the invention solving this object is characterized by the features of the independent claim.

Erfindungsgemäss wird also ein statischer Sprühmischer zum Mischen und Sprühen von mindestens zwei fliessfähigen Komponenten vorgeschlagen, mit einem rohrförmigen, einstückigen Mischergehäuse, das sich in Richtung einer Längsachse bis zu einem distalen Ende erstreckt, welches eine Austrittsöffnung für die Komponenten aufweist, mit mindestens einem in dem Mischergehäuse angeordneten Mischelement zum Durchmischen der Komponenten sowie mit einer Zerstäubungshülse, die eine Innenfläche aufweist, welche das Mischergehäuse in seinem Endbereich umschliesst, wobei die Zerstäubungshülse einen Einlass für ein unter Druck stehendes Zerstäubungsmedium aufweist. In der Innenfläche der Zerstäubungshülse sind mehrere sich jeweils in Richtung der Längsachse erstreckende Nuten vorgesehen, durch welche das Zerstäubungsmedium vom Einlass der Zerstäubungshülse zum distalen Ende des Mischergehäuses strömen kann.According to the invention, therefore, a static spray mixer for mixing and spraying at least two flowable components is proposed, comprising a tubular, one-piece mixer housing which extends in the direction of a longitudinal axis up to a distal end which has an outlet opening for the components, with at least one in the Mixer element arranged to mix the components and with a sputtering sleeve having an inner surface which encloses the mixer housing in its end region, wherein the sputtering sleeve has an inlet for a pressurized sputtering medium. In the inner surface of the sputtering sleeve a plurality of extending in the direction of the longitudinal axis grooves are provided through which the sputtering medium from the inlet of the sputtering sleeve to the distal end of the mixer housing can flow.

Durch diese Massnahmen resultiert eine besonders einfache Struktur des statischen Sprühmischers, ohne dass hierfür Zugeständnisse an die Qualität des Mischens oder des Zerstäubens vonnöten sind. Die optimale Nutzung der einzelnen Bauteile ermöglicht eine kostengünstige und wirtschaftliche Herstellung der Sprühmischer, die zudem - zumindest weitgehend - automatisiert durchgeführt werden kann. Grundsätzlich benötigt der erfindungsgemässe statische Sprühmischer nur drei Bauteile, nämlich das einstückige Mischergehäuse, die Zerstäuberhülse sowie das Mischelement, das ebenfalls einstückig ausgestaltet sein kann. Hieraus resultiert eine deutliche Reduktion der Komplexität im Vergleich zu bekannten Vorrichtungen und eine wesentlich einfachere Herstellung bzw. Montage.These measures result in a particularly simple structure of the static spray mixer, without requiring concessions on the quality of mixing or atomization. The optimal use of the individual components enables a cost-effective and economical production of the spray mixers, which moreover can-at least largely-be carried out automatically. Basically, the inventive static spray mixer requires only three components, namely the one-piece mixer housing, the atomizer sleeve and the mixing element, which may also be configured in one piece. This results in a significant reduction in complexity compared to known devices and a much simpler manufacture or assembly.

Bei der erfindungsgemäßen Ausgestaltung weist jede Nut in der radialen Richtung eine Tiefe auf, die zum distalen Ende des Mischergehäuses hin zunimmt.In the embodiment of the invention, each groove has a depth in the radial direction that increases toward the distal end of the mixer housing.

Das Mischergehäuse weist einen distalen Endbereich auf, der sich auf das distale Ende hin verjüngt. Durch diese Verjüngung wird der Zerstäubungseffekt verbessert. Die Innenfläche der Zerstäubungshülse ist zum Zusammenwirken mit dem distalen Endbereich ausgestaltet.The mixer housing has a distal end portion that tapers toward the distal end. This rejuvenation improves the atomization effect. The inner surface of the atomizing sleeve is configured to cooperate with the distal end portion.

Um insbesondere die Herstellung noch weiter zu vereinfachen, ist es vorteilhaft, wenn die Zerstäubungshülse gewindefrei mit dem Mischergehäuse verbunden ist.In order in particular to simplify the production still further, it is advantageous if the atomizing sleeve is connected thread-free with the mixer housing.

Vorzugsweise ist die Aussenfläche des Mischergehäuses im distalen Endbereich zumindest teilweise als Kegelstumpffläche ausgestaltet.Preferably, the outer surface of the mixer housing in the distal end region is at least partially designed as a frustoconical surface.

Dabei hat es sich als vorteilhaft erwiesen, wenn die Kegelstumpffläche mit der Längsachse einen Konuswinkel bildet, der mindestens 10° und höchstens 45° beträgt.It has proved to be advantageous if the truncated cone surface forms a cone angle with the longitudinal axis, which is at least 10 ° and at most 45 °.

Um eine gleichmässige Verteilung des Zerstäubungsmediums auf die Nuten zu realisieren, ist vorzugsweise zwischen der Aussenfläche des Mischergehäuses und der Innenfläche der Zerstäubungshüles ein Ringraum vorgesehen, welcher mit dem Einlass der Zerstäubungshülse und mit den Nuten in Strömungsverbindung steht.In order to realize a uniform distribution of the atomizing medium on the grooves, an annular space is preferably provided between the outer surface of the mixer housing and the inner surface of the Zerstäubungshüles, which is in fluid communication with the inlet of the atomizing sleeve and with the grooves.

Bezüglich der Geometrie der Nuten hat es sich als vorteilhaft erwiesen, wenn jede Nut in der radialen Richtung eine Tiefe aufweist, die kleiner ist, insbesondere höchstens halb so gross, wie die Erstreckung der jeweiligen Nut in der zur Längsachse und zur radialen Richtung senkrechten Richtung.With respect to the geometry of the grooves, it has proved to be advantageous if each groove in the radial direction has a depth which is smaller, in particular at most half as large as the extension of the respective groove in the direction perpendicular to the longitudinal axis and the radial direction.

Im Hinblick auf eine besonders einfache Herstellung bzw. Montage ist es vorteilhaft, wenn die Zerstäubungshülse mittels einer dichtenden Schnappverbindung am Mischergehäuse befestigt ist.With regard to a particularly simple production or assembly, it is advantageous if the atomizing sleeve is fastened by means of a sealing snap connection on the mixer housing.

Bei einem bevorzugten Ausführungsbeispiel weist das Mischergehäuse ausserhalb des distalen Endbereichs einen im wesentlichen rechteckige, vorzugsweise quadratische, Querschnittsfläche senkrecht zur Längsachse auf. Dadurch können die bewährten Mischer, die unter dem Markennamen Quadro® erhältlich sind, für den statischen Sprühmischer verwendet werden.In a preferred embodiment, the mixer housing has a substantially rectangular, preferably square, cross-sectional area perpendicular to the longitudinal axis outside the distal end region. This allows the proven mixers, available under the brand name Quadro®, to be used for the static spray mixer.

Daher ist es auch bevorzugt, dass das Mischelement senkrecht zur Längsrichtung rechteckig, vorzugsweise quadratisch, ausgestaltet ist, so wie dies bei den Quadro®-Mischern der Fall ist.Therefore, it is also preferred that the mixing element is rectangular, preferably square, perpendicular to the longitudinal direction, as is the case with the Quadro® mixers.

Um eine sichere Zuführung des Zerstäubungsmediums zu gewährleisten, weist der Einlass der Zerstäubungshülse vorzugsweise Fixiermittel für eine Zuführung für das Zerstäubungsmittel auf.In order to ensure a reliable supply of the atomizing medium, the inlet of the atomizing sleeve preferably has fixing means for a supply for the atomizing agent.

Im Hinblick auf eine besonders einfache und kostengünstige Herstellung ist es vorteilhaft, wenn das Mischergehäuse und/oder die Zerstäubungshülse spritzgegossen sind, vorzugsweise aus einem Thermoplast.With regard to a particularly simple and cost-effective production, it is advantageous if the mixer housing and / or the atomizing sleeve are injection-molded, preferably made of a thermoplastic.

Aus dem gleichen Grund ist es vorteilhaft, wenn das Mischelement einstückig ausgestaltet und spritzgegossen ist, vorzugsweise aus einem Thermoplast.For the same reason, it is advantageous if the mixing element is configured in one piece and injection-molded, preferably of a thermoplastic.

Weiter vorteilhafte Massnahmen und Ausgestaltungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.Further advantageous measures and embodiments of the invention will become apparent from the dependent claims.

Im Folgenden wird die Erfindung anhand der Zeichnung näher erläutert. In der schematischen Zeichnung zeigen teilweise im Schnitt:

Fig. 1:
einen Längsschnitt eines statischen Sprühmischers,
Fig.2:
eine perspektivische Darstellung eines statischen Sprühmischers,
Fig. 3:
eine perspektivische Schnittdarstellung des distalen Endbereichs des statischen Sprühmischers der Fig. 2,
Fig. 4:
eine Seitenansicht des distalen Endbereichs eines statischen Sprühmischers,
Fig. 5:
einen Querschnitt entlang der Schnittlinie V-V in Fig. 4,
Fig. 6:
einen Querschnitt entlang der Schnittlinie VI-VI in Fig. 4,
Fig. 7:
einen Querschnitt entlang der Schnittlinie VII-VII in Fig. 4, und
Fig. 8:
einen Querschnitt entlang der Schnittlinie VIII-VIII in Fig. 4.
In the following the invention will be explained in more detail with reference to the drawing. In the schematic drawing show partly in section:
Fig. 1:
a longitudinal section of a static spray mixer,
Figure 2:
a perspective view of a static spray mixer,
3:
a perspective sectional view of the distal end portion of the static spray mixer of Fig. 2 .
4:
a side view of the distal end portion of a static spray mixer,
Fig. 5:
a cross section along the section line VV in Fig. 4 .
Fig. 6:
a cross section along the section line VI-VI in Fig. 4 .
Fig. 7:
a cross section along the section line VII-VII in Fig. 4 , and
Fig. 8:
a cross section along the section line VIII-VIII in Fig. 4 ,

Fig. 1 zeigt einen Längsschnitt eines statischen Sprühmischers, der gesamthaft mit dem Bezugszeichen 1 bezeichnet ist. Zum besseren Verständnis zeigt Fig. 2 eine perspektivische Darstellung. Der Sprühmischer dient zum Mischen und Sprühen von mindestens zwei fliessfähigen Komponenten. Fig. 1 shows a longitudinal section of a static spray mixer, which is generally designated by the reference numeral 1. For a better understanding shows Fig. 2 a perspective view. The spray mixer is used for mixing and spraying of at least two flowable components.

Im Folgenden wird auf den für die Praxis besonders relevanten Fall Bezug genommen, dass genau zwei Komponenten gemischt und gesprüht werden. Es versteht sich aber, dass die Erfindung auch für die Durchmischung und das Sprühen von mehr als zwei Komponenten verwendet werden kann.In the following, reference will be made to the case, which is particularly relevant for practice, in that exactly two components are mixed and sprayed. It is understood, however, that the invention can also be used for mixing and spraying more than two components.

Der Sprühmischer 1 umfasst ein rohrförmiges, einstückiges Mischergehäuse 2, das sich in Richtung einer Längsachse A bis zu einem distalen Ende 21 erstreckt. Mit dem distalen Ende 21 ist dabei dasjenige Ende gemeint, an welchem im Betriebszustand die durchmischten Komponenten das Mischergehäuse 2 verlassen. Dazu ist das distale Ende 21 mit einer Austrittsöffnung 22 versehen. An dem proximalen Ende, womit das Ende gemeint ist, an welchem die zu mischenden Komponenten in das Mischergehäuse 2 eingebracht werden, weist das Mischergehäuse 2 ein Verbindungsstück 23 auf, mittels welchem das Mischergehäuse 2 mit einem Vorratsbehälter für die Komponenten verbunden werden kann. Dieser Vorratsbehälter kann beispielsweise eine an sich bekannte Zwei-Komponenten-Kartusche sein, als Koaxial- oder Side-by-Side-Kartusche ausgestaltet, oder zwei Tanks, in denen die beiden Komponenten von einander getrennt aufbewahrt werden. Je nach Ausgestaltung des Vorratsbehälters, bzw. seines Ausgangs ist das Verbindungsstück ausgestaltet, z.B. als Schnappverbindung, als Bajonettverbindung, als Gewindeverbindung oder Kombinationen davon.The spray mixer 1 comprises a tubular, one-piece mixer housing 2 which extends in the direction of a longitudinal axis A to a distal end 21. By the distal end 21 is meant that end at which the mixed components leave the mixer housing 2 in the operating state. For this purpose, the distal end 21 is provided with an outlet opening 22. At the proximal end, meaning the end at which the components to be mixed are introduced into the mixer housing 2, the mixer housing 2 has a connecting piece 23, by means of which the mixer housing 2 can be connected to a reservoir for the components. This reservoir can be, for example, a known two-component cartridge, designed as a coaxial or side-by-side cartridge, or two tanks in which the two components are kept separate from each other. Depending on the configuration of the reservoir, or its output is the connector configured, for example as a snap connection, as a bayonet connection, as a threaded connection or combinations thereof.

In dem Mischergehäuse 2 ist in an sich bekannter Weise mindestens ein statisches Mischelement 3 angeordnet, das an der inneren Wand des Mischergehäuses 2 anliegt, sodass die beiden Komponenten nur durch das Mischelement 3 hindurch vom proximalen Ende zur Austrittsöffnung 22 gelangen können. Es können entweder mehrere, hintereinander angeordnete Mischelemente 3 vorgesehen sein, oder wie im vorliegenden Ausführungsbeispiel ein einstückiges Mischelement 3, das vorzugsweise spritzgegossen ist und aus einem Thermoplast besteht. Solche statischen Mischer bzw. Mischelemente 3 an sich sind dem Fachmann hinlänglich bekannt und bedürfen daher keiner weiteren Erläuterung.In the mixer housing 2, at least one static mixing element 3 is arranged in a manner known per se, which rests against the inner wall of the mixer housing 2, so that the two components can only pass through the mixing element 3 from the proximal end to the outlet opening 22. Either several, successively arranged mixing elements 3 may be provided, or as in the present embodiment, a one-piece mixing element 3, which is preferably injection molded and consists of a thermoplastic. Such static mixers or mixing elements 3 per se are well known to the person skilled in the art and therefore require no further explanation.

Insbesondere geeignet sind solche Mischer bzw. Mischelemente 3 wie sie unter der Markenbezeichnung QUADRO® von der Firma Sulzer Chemtech AG (Schweiz) vertrieben werden. Derartige Mischelemente sind beispielsweise in den bereits zitierten Dokumenten EP-A-0 749 776 und EP-A-0 815 929 beschrieben. Ein solches Mischelement 3 vom Quadro®-Typ hat senkrecht zur Längsrichtung A einen rechteckigen, insbesondere einen quadratischen Querschnitt. Dementsprechend hat auch das einstückige Mischergehäuse 2 zumindest in dem Bereich, in dem es das Mischelement 3 umschliesst, eine im wesentlichen rechteckige, insbesondere quadratische Querschnittsfläche senkrecht zur Längsachse A.Particularly suitable are those mixers or mixing elements 3 such as those sold under the brand name QUADRO® by the company Sulzer Chemtech AG (Switzerland). Such mixing elements are for example in the already cited documents EP-A-0 749 776 and EP-A-0 815 929 described. Such a mixing element 3 of the Quadro® type has a rectangular, in particular a square cross section, perpendicular to the longitudinal direction A. Accordingly, the one-piece mixer housing 2, at least in the region in which it encloses the mixing element 3, a substantially rectangular, in particular square cross-sectional area perpendicular to the longitudinal axis A.

Das Mischelement 3 erstreckt sich nicht ganz bis an das distale Ende 21 des Mischergehäuses 2, sondern endet an einem Anschlag 25 (siehe Fig. 3). In Strömungsrichtung gesehen bis zu diesem Anschlag 25 hat der Innenraum des Mischergehäuses 2 einen im wesentlichen quadratischen Querschnitt zur Aufnahme des Mischelements 3. An diesem Anschlag 25 geht der Innenraum des Mischergehäuses 2 in eine Kreiskegelform über, weist also einen kreisförmigen Querschnitt auf und bildet einen Ausgangsbereich 26 der sich in Richtung des distalen Endes 21 verjüngt und dort in die Austrittsöffnung 22 mündet.The mixing element 3 does not extend all the way to the distal end 21 of the mixer housing 2, but ends at a stop 25 (see Fig. 3 ). Seen in the flow direction up to this stop 25, the interior of the mixer housing 2 has a substantially square cross-section for receiving the mixing element 3. At this stop 25, the interior of the mixer housing 2 is in a circular cone shape, thus has a circular cross-section and forms an exit region 26 which tapers in the direction of the distal end 21 and there opens into the outlet opening 22.

Der statische Sprühmischer 1 weist ferner eine Zerstäubungshülse 4 auf, die eine Innenfläche hat, welche das Mischergehäuse 2 in seinem Endbereich umschliesst. Die Zerstäubungshülse 4 ist einstückig ausgestaltet und vorzugsweise spritzgegossen, insbesondere aus einem Thermoplast. Sie weist einen Einlass 41 für ein unter Druck stehendes Zerstäubungsmedium auf, das insbesondere gasförmig ist. Vorzugsweise ist das Zerstäubungsmedium Druckluft. Um ein sicheres Einbringen der Druckluft in die Zerstäubungshülse 4 zu gewährleisten, weißt der Einlass 41 Fixiermittel 42 für die Zuführung der Druckluft auf, hier ein Gewinde, auf das der Anschluss eines Druckluftschlauchs aufgeschraubt werden kann. Natürlich sind auch andere Fixiermittel 42 möglich, wie beispielsweise eine Riffelung, eine Schelle, eine Klemm- oder Quetschverbindung, ein Bajonettanschluss oder ähnliches. Der Einlass 42 kann für alle bekannten Anschlüsse ausgestaltet sein, insbesondere auch für einen Luer-Lock.The static spray mixer 1 further comprises a sputtering sleeve 4 having an inner surface which encloses the mixer housing 2 in its end region. The atomizing sleeve 4 is designed in one piece and is preferably injection-molded, in particular made of a thermoplastic. It has an inlet 41 for a pressurized atomizing medium, which is in particular gaseous. Preferably, the atomization medium is compressed air. In order to ensure a safe introduction of the compressed air into the atomizing sleeve 4, the inlet 41 fixation means 42 for the supply of compressed air, here a thread on which the connection of a compressed air hose can be screwed. Of course, other fixing means 42 are possible, such as a corrugation, a clamp, a crimp or crimp, a bayonet connection or the like. The inlet 42 can be designed for all known connections, in particular also for a Luer lock.

Um eine besonders einfache Montage bzw. Herstellung zu ermöglichen, ist die Zerstäubungshülse 4 vorzugsweise gewindefrei mit dem Mischergehäuse verbunden, beim vorliegenden Ausführungsbeispiel mittels einer Schnappverbindung. Dazu ist am Mischergehäuse 2 eine flanschartige Erhebung 24 vorgesehen (siehe Fig. 3), welche sich über den gesamten Umfang des Mischergehäuses 2 erstreckt. An der Innenfläche der Zerstäubungshülse 4 ist eine Umfangsnut 43 vorgesehen, welche zum Zusammenwirken mit der Erhebung 24 ausgestaltet ist. Wird die Zerstäubungshülse 4 über das Mischergehäuse 2 geschoben, so schnappt die Erhebung 24 in die Umfangsnut 43 ein und sorgt für eine stabile Verbindung der Zerstäubungshülse 4 mit dem Mischergehäuse 2. Vorzugsweise ist diese Schnappverbindung dichtend ausgestaltet, sodass das Zerstäubungsmedium- hier die Druckluft- nicht durch diese aus der Umfangsnut 43 und der Erhebung 24 bestehende Verbindung entweichen kann.In order to enable a particularly simple assembly or production, the atomizing sleeve 4 is preferably connected thread-free with the mixer housing, in the present embodiment by means of a snap connection. For this purpose, a flange-like elevation 24 is provided on the mixer housing 2 (see Fig. 3 ), which extends over the entire circumference of the mixer housing 2. On the inner surface of the atomizing sleeve 4, a circumferential groove 43 is provided, which is designed to cooperate with the survey 24. If the atomizing sleeve 4 is pushed over the mixer housing 2, the projection 24 snaps into the circumferential groove 43 and ensures a stable connection of the atomizing sleeve 4 to the mixer housing 2. Preferably, this snap connection is designed to be sealed so that the atomizing medium - in this case not compressed air can escape through this from the circumferential groove 43 and the survey 24 existing connection.

Natürlich ist auch möglich, zusätzliche Dichtmittel, beispielsweise einen O-Ring zwischen dem Mischergehäuse 2 und der Zerstäubungshülse 4 anzuordnen.Of course, it is also possible to arrange additional sealing means, for example an O-ring, between the mixer housing 2 and the atomizing sleeve 4.

Alternativ zu der dargestellten Ausführung ist es auch möglich, eine Umfangsnut am Mischergehäuses 2 vorzusehen und an der Zerstäubungshülse 4 eine Erhebung, welche in diese Umfangsnut eingreift.Alternatively to the illustrated embodiment, it is also possible to provide a circumferential groove on the mixer housing 2 and on the atomizing sleeve 4 a survey which engages in this circumferential groove.

Erfindungsgemäss sind in der Innenfläche der Zerstäubungshülse 4 mehrere sich jeweils in Richtung der Längsachse A erstreckende Nuten 5 vorgesehen, durch welche das Zerstäubungsmedium vom Einlass 42 der Zerstäubungshülse 4 zum distalen Ende 21 des Mischergehäuses 2 strömen kann, auch wenn in Fig. 2, 3 und 5 bis 8 eine Ausgestaltung gezeigt ist, bei der die Nuten abweichend hiervon nur in der Außenfläche des Mischergehäuses dargestellt sind.According to the invention, a plurality of grooves 5 each extending in the direction of the longitudinal axis A are provided in the inner surface of the atomizing sleeve 4 through which the atomizing medium can flow from the inlet 42 of the atomizing sleeve 4 to the distal end 21 of the mixer housing 2, even if in FIG Fig. 2 . 3 and 5 to 8 an embodiment is shown in which the grooves are shown deviating thereof only in the outer surface of the mixer housing.

Mit der Bezeichnung "in Richtung der Längsachse A" ist auch gemeint, dass die jeweilige Nut 5 gekrümmt, beispielsweise bogenförmig ausgestaltet sein kann. Es ist also nicht unbedingt so, dass jede der Nuten 5 geradlinig in Richtung der Längsachse A verlaufen bzw. auf die Längsachse A zu laufen muss.By the term "in the direction of the longitudinal axis A" is also meant that the respective groove 5 curved, for example, can be designed arcuate. Thus, it is not absolutely necessary for each of the grooves 5 to run in a straight line in the direction of the longitudinal axis A or to run along the longitudinal axis A.

Im Folgenden wird auf einen Fall Bezug genommen, dass Nuten 5 nur in der Aussenfläche des Mischergehäuses 2 vorgesehen sind. Erfindungsgemäß sind die Nuten 5 jedoch zumindest auch in der Innenfläche der Zerstäubungshülse 4 vorgesehen.In the following, reference will be made to a case that grooves 5 are provided only in the outer surface of the mixer housing 2. According to the invention, however, the grooves 5 are provided at least also in the inner surface of the atomizing sleeve 4.

Für die detaillierte Beschreibung der Nuten 5 und der Zerstäubungshülse 4 wird auf die Figuren 3 bis 8 Bezug genommen. Fig. 3 zeigt eine perspektivische Schnittdarstellung des Endbereichs des statischen Sprühmischers, Fig. 4 eine Seitenansicht. Die Fig. 5-8 zeigen jeweils einen Querschnitt senkrecht zur Längsachse A, und zwar Fig. 5 entlang der Schnittlinie V-V in Fig. 4; Fig. 6 entlang der Schnittlinie VI-VI; Fig. 7 entlang der Schnittlinie VII-VII und Fig. 8 entlang der Schnittlinie VIII-VIII in Fig. 4.For the detailed description of the grooves 5 and the atomizing sleeve 4 is on the FIGS. 3 to 8 Referenced. Fig. 3 shows a perspective sectional view of the end portion of the static spray mixer, Fig. 4 a side view. The Fig. 5-8 each show a cross section perpendicular to the longitudinal axis A, namely Fig. 5 along the section line VV in Fig. 4 ; Fig. 6 along the section line VI-VI; Fig. 7 along the section line VII-VII and Fig. 8 along the section line VIII-VIII in Fig. 4 ,

Das Mischergehäuse 2 weist einen distalen Endbereich 27 auf, der sich auf das distale Ende 21 hin verjüngt. Insbesondere ist die Aussenfläche des Mischergehäuses im distalen Endbereich 27 zumindest teilweise als Kegelstumpffläche ausgebildet. Der Konuswinkel α, den die Aussenfläche des Mischergehäuses 2 im distalen Endbereich 27 mit der Längsachse A bildet, beträgt mindestens 10° und höchstens 45°. Dieser Konuswinkel α ist im allgemeinen verschieden von und speziell kleiner als der Konuswinkel mit dem sich der Ausgangsbereich 26 im Innenraum des Mischergehäuses 2 verjüngt.The mixer housing 2 has a distal end portion 27, which tapers toward the distal end 21. In particular, the outer surface of the mixer housing in the distal end region 27 is at least partially formed as a frustoconical surface. The cone angle α, which forms the outer surface of the mixer housing 2 in the distal end region 27 with the longitudinal axis A, is at least 10 ° and at most 45 °. This cone angle α is in general different from and especially smaller than the cone angle with which the output region 26 tapers in the interior of the mixer housing 2.

Die Innenfläche der Zerstäubungshülse 4 ist zum Zusammenwirken mit dem distalen Endbereich 27 ausgestaltet. In dem mit K bezeichneten Bereich am distalen Ende 21 des Mischergehäuses 2 ist die Innenfläche der Zerstäubungshülse 4 ebenfalls als Kegelstumpffläche ausgestaltet, welche den gleichen Konuswinkel α aufweist wie die Aussenfläche des Mischergehäuses 2 in diesem Bereich K. In dem Bereich K liegen die Innenfläche der Zerstäubungshülse 4 und die Aussenfläche des Mischergehäuses 2 eng und dichtend aneinander an so dass in diesem Bereich K die Nuten 5 in der Aussenfläche des Mischergehäuses 2 jeweils einen separaten Strömungskanal bilden. (siehe Fig. 5).The inner surface of the atomizing sleeve 4 is configured to cooperate with the distal end portion 27. In the region designated K at the distal end 21 of the mixer housing 2, the inner surface of the atomizing sleeve 4 is also designed as a frustoconical surface having the same cone angle α as the outer surface of the mixer housing 2 in this region K. In the region K are the inner surface of the Zerstäubungshülse 4 and the outer surface of the mixer housing 2 closely and sealingly against each other so that in this region K, the grooves 5 in the outer surface of the mixer housing 2 each form a separate flow channel. (please refer Fig. 5 ).

Stromaufwärts des Bereichs K ist die Innenfläche der Zerstäubungshülse 4 zunächst immer noch kegelstumpfförmig, hat aber einen grösseren Querschnitt als die Aussenfläche des Mischergehäuses 2, sodass zwischen der Aussenfläche des Mischergehäuses 2 und der Innenfläche der Zerstäuberhülse 4 ein Ringraum 6 existiert (siehe Fig. 7). Der Ringraum 6 steht mit dem Einlass 41 der Zerstäuberhülse 4 in Strömungsverbindung. Weiter stromaufwärts geht die Innenfläche der Zerstäubungshülse 4 in eine im wesentlichen kreiszylindrische Form über, wobei auch hier der Ringraum 6 existiert. Der Ringraum 6 wird auf seiner dem distalen Ende 21 abgewandten Seite durch die Erhebung 24 begrenzt, die dichtend in die Umfangsnut 43 eingreift.Upstream of the region K, the inner surface of the atomizing sleeve 4 is initially still frusto-conical, but has a larger cross-section than the outer surface of the mixer housing 2, so that between the outer surface of the mixer housing 2 and the inner surface of the Zerstäuberhülse 4 an annular space 6 exists (see Fig. 7 ). The annular space 6 is in fluid communication with the inlet 41 of the atomizer sleeve 4. Further upstream, the inner surface of the sputtering sleeve 4 is in a substantially circular cylindrical shape, whereby also the annular space 6 exists. The annular space 6 is limited on its side remote from the distal end 21 by the elevation 24, which engages sealingly in the circumferential groove 43.

Die Nuten 5, bei dem gezeigten Beispiel sind es acht Nuten 5, sind gleichmässig verteilt. Es hat sich als vorteilhaft im Hinblick auf eine möglichst vollständige und homogene Zerstäubung der aus der Austrittsöffnung austretenden durchmischten Komponenten erwiesen, wenn die von den Nuten 5 erzeugten Druckluftströmungen bezüglich der radialen Richtung flach sind, also keine zu grosse Ausdehnung in der zur Längsachse A senkrechten Richtung aufweisen.The grooves 5, in the example shown, there are eight grooves 5, are evenly distributed. It has proved to be advantageous with regard to the most complete and homogeneous atomization of the mixed components emerging from the outlet opening when the compressed air flows generated by the grooves 5 are flat with respect to the radial direction, ie no excessive expansion in the direction perpendicular to the longitudinal axis A. exhibit.

Eine hierfür geeignete Geometrie der Nuten 5 ist insbesondere in den Fig. 5 bis 7 gut zu erkennen. Die Nuten 5 des Mischergehäuses 2 sind durch zwei Abmessungen charakterisiert, nämlich ihre als Tiefe T bezeichnete Erstreckung in radialer Richtung, wobei mit der radialen Richtung eine senkrecht auf der Längsachse A stehende Richtung gemeint ist, die radial von der Längsachse A nach aussen weist, und ihre Erstreckung B in der zur Längsachse A und zur radialen Richtung senkrechten Richtung. Vorzugsweise ist die Tiefe T jeder Nut 5 kleiner, insbesondere höchstens halb so gross, wie die Erstreckung B in der zur Längsachse A und zur radialen Richtung senkrechten Richtung an der gleichen Stelle. Speziell bevorzugt ist die Tiefe T jeweils etwa ein Drittel der Erstreckung B.A suitable geometry of the grooves 5 is particularly in the Fig. 5 to 7 clearly visible. The grooves 5 of the mixer housing 2 are characterized by two dimensions, namely their extension designated as depth T. in the radial direction, the radial direction meaning a direction perpendicular to the longitudinal axis A which faces radially outward from the longitudinal axis A, and its extension B is in the direction perpendicular to the longitudinal axis A and the radial direction. Preferably, the depth T of each groove 5 is smaller, in particular at most half as large as the extension B in the direction perpendicular to the longitudinal axis A and the radial direction at the same location. Especially preferably, the depth T is about one third of the extent B in each case.

Eine weitere vorteilhafte Massnahme besteht darin, wenn die Nuten 5 jeweils so ausgestaltet sind, dass ihre Tiefe T in Strömungsrichtung gesehen, also zum distalen Ende 21 hin zunimmt. Dieses Merkmal ist durch einen Vergleich der Fig. 5-7 erkennbar.A further advantageous measure consists in that the grooves 5 are each designed so that their depth T seen in the direction of flow, ie towards the distal end 21 increases. This feature is by comparing the Fig. 5-7 recognizable.

Bezüglich der Geometrie und des Verlaufs der Nuten 5 sind natürlich noch viele andere Ausgestaltungen möglich. Die Nuten 5 können auch auf den speziellen Anwendungsfall bezogen hinsichtlich ihrer Zahl, ihres Verlaufs und ihrere Abmessungen optimiert werden.With regard to the geometry and the course of the grooves 5, of course, many other embodiments are possible. The grooves 5 can also be optimized for the specific application in terms of their number, their course and their dimensions.

Eine weitere Variante besteht darin, dass sich die flanschartige Erhebung 24, die am besten in Fig. 3 zu erkennen ist, nicht durchgängig über den gesamten Umfang des Mischergehäuses 2 erstreckt, sondern das zwei Paare von flanschartigen Erhebungen existieren, die bezüglich der durch die Längsachse A festgelegten Richtung versetzt zueinander sind. Ein Paar der Erhebungen bildet dann eine auf der gemäss Fig. 3 darstellungsgemässen Oberseite und eine auf der Unterseite des Mischergehäuses 2 vorgesehene Erhebung, das andere Paar wird durch eine auf der Vorderseite und eine auf der Rückseite vorgesehene Erhebung gebildet. Jede der einzelnen Erhebung erstreckt sich jeweils höchstens über eine Seite oder bei einer kreisförmigen Ausgestaltung über höchstens 90° (ein Viertel) des Umfangs. Das Paar auf der Ober-und Unterseite ist dabei bezüglich der durch die Längsachse A definierten Richtung versetzt zu dem Paar auf der Vorder- und Rückseite, das heisst, das erstgenannte Paar befindet sich beispielsweise näher am distalen Ende 21 des Mischergehäuses 2 als das letzt genannte, wobei die zum gleichen Paar gehörenden Erhebungen jeweils in der gleichen Entfernung vom distalen Ende 21 vorgesehen sind. Dementsprechend erstreckt sich die Umfangsnut 43 nicht über den gesamten inneren Umfang der Zerstäubungshülse 4, sondern es sind zwei Teilnuten vorgesehen, die um 180° zueinander versetzt sind, und deren Länge in Umfangsrichtung jeweils höchstens so gross ist wie die Länge einer einzelnen Erhebung. Bei dieser Ausgestaltung kann die Zerstäubungshülse in zwei unterschiedlichen um 90° zueinander verdrehten Orientierungen auf das Mischergehäuse aufgeschoben werden. In der einen Orientierung schnappen die Teilnuten in das erste Paar der Erhebungen, in der anderen Orientierung schnappen sie in das zweite bzw. andere Paar der Erhebungen. Durch diese Massnahme lässt sich die Grösse bzw. der Strömungsquerschnitt des Ringraums 6 bzw. der Nuten 5 verändern, sodass verschiedene Strömungen für das Zerstäubungsmedium einstellbar sind.Another variant is that the flange-like elevation 24, the best in Fig. 3 can be seen, not consistently extends over the entire circumference of the mixer housing 2, but that there are two pairs of flange-like elevations, which are offset with respect to the direction defined by the longitudinal axis A direction to each other. A pair of the surveys then forms one on the according Fig. 3 according to the top and a provided on the bottom of the mixer housing 2 survey, the other pair is formed by a provided on the front and on the back elevation. Each of the individual survey extends over at most one side or in a circular configuration over at most 90 ° (one quarter) of the circumference. The pair on the top and bottom is offset with respect to the direction defined by the longitudinal axis A to the pair on the front and back, that is, the former pair is, for example closer to the distal end 21 of the mixer housing 2 than the latter in which the projections belonging to the same pair are each provided at the same distance from the distal end 21. Accordingly, the circumferential groove extends 43 not over the entire inner circumference of the atomizing sleeve 4, but there are two sub-grooves, which are offset by 180 ° to each other, and their length in the circumferential direction is in each case at most as large as the length of a single survey. In this embodiment, the sputtering sleeve can be pushed onto the mixer housing in two different orientations rotated by 90 ° relative to one another. In one orientation, the sub-grooves snap into the first pair of protuberances, in the other orientation they snap into the second or other pair of protuberances. As a result of this measure, the size or the flow cross-section of the annular space 6 or of the grooves 5 can be changed so that different flows for the atomizing medium can be set.

Im Betrieb funktioniert dieses Ausführungsbeispiel wie folgt. Der statische Sprühmischer wird mittels seines Verbindungsstücks 23 mit einem Vorratsgefäss verbunden, welches die beiden Komponenten von einander getrennt enthält, beispielsweise mit einer Zwei-Komponenten-Kartusche. Der Einlass 41 der Zerstäubungshülse 4 wird mit einer Quelle für das Zerstäubungsmedium, beispielsweise einer Druckluftquelle verbunden. Nun werden die beiden Komponenten ausgetragen, gelangen in den statischen Sprühmischer 1 und werden dort mittels des Mischelements 3 innig durchmischt. Als homogen durchmischtes Material gelangen die beiden Komponenten nach Durchströmen des Mischelements 3 durch den Ausgangsbereich 26 des Mischergehäuses 2 zur Austrittsöffnung 22. Die Druckluft strömt durch den Einlass 41 der Zerstäubungshülse 4 in den Ringraum 6 zwischen der Innenfläche der Zerstäubungshülse 4 und der Aussenfläche des Mischergehäuses 2 und von dort durch die Nuten 5, die Strömungskanäle bilden, zum distalen Ende 21 und somit zur Austrittsöffnung 22 des Mischergehäuses 3. Hier treffen sie auf das durch die Austrittsöffnung 22 austretende durchmischte Material, zerstäuben es gleichmässig und transportieren es als Sprühstrahl zu dem zu behandelnden oder zu beschichtenden Substrat. Da bei einigen Anwendungen das Austragen der Komponenten aus dem Vorratsgefäss mit Druckluft bzw. druckluftunterstützt erfolgt, kann die Druckluft auch für die Zerstäubung verwendet werden.In operation, this embodiment operates as follows. The static spray mixer is connected by means of its connecting piece 23 to a storage vessel containing the two components separated from each other, for example with a two-component cartridge. The inlet 41 of the atomizing sleeve 4 is connected to a source of atomizing medium, for example a compressed air source. Now the two components are discharged, get into the static spray mixer 1 and are intimately mixed there by means of the mixing element 3. As homogeneously mixed material, the two components, after flowing through the mixing element 3, pass through the outlet region 26 of the mixer housing 2 to the outlet opening 22. The compressed air flows through the inlet 41 of the atomizing sleeve 4 into the annular space 6 between the inner surface of the atomizing sleeve 4 and the outer surface of the mixer housing 2 and from there through the grooves 5, which form flow channels, to the distal end 21 and thus to the outlet opening 22 of the mixer housing 3. Here they meet the mixed material exiting through the outlet opening 22, atomize it uniformly and transport it as a spray jet to the treatment to be treated or substrate to be coated. Since in some applications the discharge of the components from the storage vessel takes place with compressed air or compressed air, the compressed air can also be used for the atomization.

Ein besonderer Vorteil des erfindungsgemässen statischen Sprühmischers 1 ist in seiner besonders einfachen Konstruktion und Herstellung zu sehen. Im Prinzip bedarf es nur dreier Teile, nämlich eines einstückigen Mischergehäuses 2, eines einstückigen Mischelements 3 und einer einstückigen Zerstäubungshülse 4, wobei jedes dieser Teile in einfacher und wirtschaftlicher Weise mittels Spritzgiessens herstellbar ist. Die besonders einfache Konstruktion ermöglicht auch ein - zumindest weitgehend - automatisiertes Zusammensetzen der Teile des statischen Sprühmischers 1. Insbesondere sind keine Verschraubungen dieser drei Teile notwendig.A particular advantage of the inventive static spray mixer 1 can be seen in its particularly simple design and manufacture. in the Principle requires only three parts, namely a one-piece mixer housing 2, a one-piece mixing element 3 and a one-piece atomizing sleeve 4, wherein each of these parts can be produced in a simple and economical manner by injection molding. The particularly simple design also allows for - at least largely - automated assembly of the parts of the static spray mixer 1. In particular, no screwing these three parts are necessary.

Claims (12)

  1. A static spray mixer for mixing and spraying at least two flowable components having a tubular, single-piece mixer housing (2) which extends in the direction of a longitudinal axis (A) up to a distal end (21) which has an outlet opening (22) for the components, having at least one mixing element (3) arranged in the mixer housing (2) for intermixing the components as well as having an atomization sleeve (4) which has an inner surface which surrounds the mixer housing (2) in its end region, wherein the atomization sleeve (4) has an inlet (41) for a pressurized atomization medium, characterized in that the mixer housing (2) has a distal end region (27) which tapers toward the distal end (21), with the inner surface of the atomization sleeve (4) being designed to cooperate with the distal end region (27) and a plurality grooves (5) being provided in the inner surface of the atomization sleeve (4) which respectively extend in the direction of the longitudinal axis (A) and through which the atomization medium can flow from the inlet (41) of the atomization sleeve (4) to the distal end (21) of the mixer housing (2), with each groove (5) having a depth (T) in the radial direction which increases toward the distal end (21) of the mixer housing (2).
  2. A static spray mixer in accordance with claim 1, in which the atomization sleeve (4) is connected in a thread-free manner to the mixer housing (2).
  3. A static spray mixer in accordance with claim 1 or claim 2, in which the outer surface of the mixer housing (2) in the distal end region (21) is designed at least partly as a frustoconical surface.
  4. A static spray mixer in accordance with claim 3, wherein the frustoconical surface forms a cone angle (α) with the longitudinal axis (A) which amounts to at least 10° and at most 45°.
  5. A static spray mixer in accordance with any one of the preceding claims, in which a ring space (6) is provided between the outer surface of the mixer housing (2) and the inner surface of the atomization sleeve (4) and is in flow communication with the inlet (41) of the atomization sleeve (4) and with the grooves (5).
  6. A static spray mixer in accordance with any one of the preceding claims, in which each groove (5) has a depth (T) in the radial direction which is smaller than, in particular at most half as large as, the extent (B) of the respective groove (5) in the direction perpendicular to the longitudinal axis (A) and to the radial direction.
  7. A static spray mixer in accordance with any one of the preceding claims, in which the atomization sleeve (4) is fastened to the mixer housing (2) by means of a sealing snap-in connection (24, 43).
  8. A static spray mixer in accordance with any one of the preceding claims, in which the mixer housing (2) has a substantially rectangular, preferably square, cross-sectional surface perpendicular to the longitudinal axis (A) outside the distal end region (27).
  9. A static spray mixer in accordance with any one of the preceding claims, in which the mixing element (3) is designed as rectangular, preferably square, perpendicular to the longitudinal direction (A).
  10. A static spray mixer in accordance with any one of the preceding claims, in which the inlet (41) of the atomization sleeve (4) has fixing means for a supply for the atomization means.
  11. A static spray mixer in accordance with any one of the preceding claims, in which the mixer housing (2) and/or the atomization sleeve (4) is/are injection molded, preferably from a thermoplastic.
  12. A static spray mixer in accordance with any one of the preceding claims, in which the mixing element (3) is designed in one piece and is injection molded, preferably from a thermoplastic.
EP10167599.9A 2009-08-20 2010-06-29 Static spray mixer Active EP2286925B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10167599.9A EP2286925B1 (en) 2009-08-20 2010-06-29 Static spray mixer

Applications Claiming Priority (2)

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EP09168285 2009-08-20
EP10167599.9A EP2286925B1 (en) 2009-08-20 2010-06-29 Static spray mixer

Publications (3)

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EP2286925A2 EP2286925A2 (en) 2011-02-23
EP2286925A3 EP2286925A3 (en) 2015-08-19
EP2286925B1 true EP2286925B1 (en) 2018-03-14

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US (1) US10065200B2 (en)
EP (1) EP2286925B1 (en)
JP (1) JP2011041943A (en)
KR (2) KR20110019720A (en)
CN (1) CN101992039B (en)
AU (1) AU2010212322B2 (en)
BR (1) BRPI1002969A2 (en)
CA (1) CA2711314C (en)
RU (1) RU2533145C2 (en)
TW (1) TWI580476B (en)

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KR20120131095A (en) * 2011-05-23 2012-12-04 술저 믹스팩 아게 Connecting piece for a static spray mixer
US9878335B2 (en) 2012-05-14 2018-01-30 Sulzer Mixpac Ag Spray mixer for mixing and spraying at least two flowable components
DE102013207021A1 (en) * 2013-04-18 2014-10-23 Henkel Ag & Co. Kgaa Adapter for an output device
EP3670001B1 (en) * 2018-12-18 2021-07-28 IPR-Intelligente Peripherien für Roboter GmbH Method for cavity preservation, mixing nozzle unit and cavity preservation device with such a mixing nozzle unit
US11541406B2 (en) * 2020-03-30 2023-01-03 Medmix Switzerland Ag Spray nozzle
WO2024062453A1 (en) * 2022-09-23 2024-03-28 3M Innovative Properties Company Fluid nozzle and fluid system

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JP2011041943A (en) 2011-03-03
EP2286925A3 (en) 2015-08-19
CN101992039A (en) 2011-03-30
KR20110019720A (en) 2011-02-28
KR101926666B1 (en) 2018-12-07
BRPI1002969A2 (en) 2012-04-17
US20110042483A1 (en) 2011-02-24
AU2010212322A1 (en) 2011-03-10
RU2533145C2 (en) 2014-11-20
CA2711314A1 (en) 2011-02-20
EP2286925A2 (en) 2011-02-23
CA2711314C (en) 2017-08-15
US10065200B2 (en) 2018-09-04
KR20180018637A (en) 2018-02-21
TWI580476B (en) 2017-05-01
TW201124206A (en) 2011-07-16
CN101992039B (en) 2017-07-14
RU2010134755A (en) 2012-02-27
AU2010212322B2 (en) 2015-02-12

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