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EP3551335B1 - Liquid-jet nozzle - Google Patents

Liquid-jet nozzle Download PDF

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Publication number
EP3551335B1
EP3551335B1 EP17828660.5A EP17828660A EP3551335B1 EP 3551335 B1 EP3551335 B1 EP 3551335B1 EP 17828660 A EP17828660 A EP 17828660A EP 3551335 B1 EP3551335 B1 EP 3551335B1
Authority
EP
European Patent Office
Prior art keywords
jet
liquid
housing
jet nozzle
nozzle according
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
EP17828660.5A
Other languages
German (de)
French (fr)
Other versions
EP3551335A1 (en
Inventor
Felix Lugtenberg
Richard Pauwels
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.)
Aebi Schmidt Nederland BV
Original Assignee
Aebi Schmidt Nederland BV
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Publication date
Application filed by Aebi Schmidt Nederland BV filed Critical Aebi Schmidt Nederland BV
Publication of EP3551335A1 publication Critical patent/EP3551335A1/en
Application granted granted Critical
Publication of EP3551335B1 publication Critical patent/EP3551335B1/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
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3006—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the controlling element being actuated by the pressure of the fluid to be sprayed
    • 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
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/06—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in annular, tubular or hollow conical form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3013—Lift valves
    • 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
    • B05B1/3402—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 avoid or reduce turbulence, e.g. with fluid flow straightening means

Definitions

  • the present invention relates to a liquid jet nozzle, comprising a housing with a liquid inlet opening, a jet outlet opening and a jet shaping region with a flow channel, the passage cross section of which can be changed, arranged between the liquid inlet opening and the jet outlet opening.
  • jet nozzle is for example from the DE 102014018130 A1 known.
  • spray nozzles which are intended to form fine droplets or a liquid mist
  • jet nozzles depend on the formation of a liquid jet that does not disintegrate over the greatest possible distance.
  • the from the DE 102014018130 A1 known jet nozzle has a throttle sleeve which is displaceable relative to the housing and the jet shaping body and which is pretensioned by means of a spring device against the direction of flow around the jet shaping body, which has an annular piston section guided in a pre-pressure chamber of the housing communicating with the liquid inlet and an annular piston section which interacts with the cone area of the jet shaping body, together with this one having an annular passage cross-section defining passage with a cross-sectional area that changes as a function of the respective operating state.
  • the FR 2 916 657 A1 discloses a liquid distribution nozzle equipped with a closure device.
  • This comprises two components, namely a base body and a closure part.
  • the base body which can be attached to a liquid container, comprises a pipe section through which a flow can flow and a core which is arranged in the area of the liquid outlet and tapering off in a cone, with an annular passage cross-section between the pipe section and the core.
  • the closure part which is made of a flexible material (e.g. elastomer), has a jacket section surrounding the pipe section on the outside and a funnel section molded thereon. Depending on the liquid throughput through the annular space, the funnel section of the closure part expands and narrows, with the funnel section resting on the core without liquid throughput and thus closing the liquid distribution nozzle.
  • the EP 2 949 593 A1 discloses a drop dispenser which is structurally very similar to the liquid distribution nozzle recognized above according to the FR 2 916 657 A1 .
  • the EP 2 478 773 A1 discloses a valve system as it is used in machines such as chocolate, etc. which are used for pouring flowable masses.
  • the valve system comprises an adapter and several (for example four) valve flaps which are fixed to this and joined together to form a valve. These can be shaped and deformed under the action of the casting compound. Through the specific design of the valve flaps (e.g. by means of ribs), these can For example, twist themselves when opening in such a way that the casting compound flowing between you is given a twist.
  • the present invention has set itself the goal of providing a jet nozzle of the type specified at the outset which is further improved in terms of the operating behavior, the aim being in particular to improve the reproducibility of jet formation with changing liquid throughputs.
  • the passage cross-section is defined by an elastically deformable funnel membrane permanently attached to the housing on its outer circumference (largest circumference).
  • an elastically deformable funnel membrane permanently attached to the housing on its outer circumference (largest circumference).
  • the funnel membrane expands radially - in its area downstream of the sealed connection on the housing - and when the liquid pressure drops, the funnel membrane contracts radially there.
  • the elastically deformable funnel membrane reacts immediately and particularly sensitively to any change in the prevailing operating conditions.
  • the housing which projects into the funnel membrane Beam shaping body arranged.
  • An annular flow channel is formed between the housing and the jet shaping body over at least part of its axial length.
  • the said jet shaping body has an end region which tapers in the direction of the jet outlet opening, particularly preferably essentially conical and tapering to a point. This creates such an annular passage cross-section defined radially on the inside by the jet shaping body and radially on the outside by the funnel membrane, the cross-sectional area of which decreases more or less steadily over an axial extent in the direction of flow of the jet nozzle with simultaneous orientation of the flowing liquid with a component directed radially inward.
  • the funnel membrane - with a suitable other design of the liquid jet nozzle can simultaneously also reliably perform the function of a closure when the liquid throughput has decreased to zero.
  • the elastic ring-shaped funnel membrane can - with its inner circumference - rest on the outside of the jet-shaping body and in this way completely close the (ring-shaped) passage cross-section.
  • a separate closure device can also be arranged upstream of the elastic funnel membrane. If necessary, this closure device can in turn comprise an elastic membrane which fulfills a non-return function.
  • the jet shaped body is arranged immovably in the housing.
  • Spoke-like structures which are provided upstream of the funnel membrane in an annular space existing between the housing and the jet-shaping body and hold the jet-shaping body, can furthermore also form flow guide surfaces through suitable dimensioning and / or profiling.
  • the funnel membrane is particularly preferably fixed immovably in the housing on its outer circumference.
  • the liquid jet nozzle according to the invention be manufactured with a particularly low manufacturing cost.
  • the funnel membrane has a bead-shaped outer edge region. This is favorable with regard to a tight and permanent fixation of the funnel membrane on its outer circumference in the housing of the liquid jet nozzle with simple means.
  • a detachable retaining ring can be provided in the area of the jet outlet opening of the housing, which acts on a clamping sleeve, which in turn fixes the outer circumference of the funnel membrane in the housing (on the bead-shaped outer edge area of the funnel membrane).
  • the liquid jet nozzle shown in the drawing comprises a housing 1 which has a liquid inlet opening 2 and a jet outlet opening 3.
  • the liquid inlet opening 2 and the jet outlet opening 3 lie opposite one another - based on the flow direction A - so that the liquid jet formed in a jet shape area S leaves the jet nozzle in the same direction in which the liquid enters the jet nozzle through the liquid inlet opening 2.
  • the housing 1 comprises an approximately sleeve-shaped base body 4 and a retaining ring 5 screwed onto the base body 4 at the end in the region of the jet outlet opening 3 of the housing 1, the function of which is explained in detail below.
  • a jet shaping body 6 extends along its axis. This has a substantially cylindrical main region 7 and a conical design which tapers in the direction of the jet outlet opening 3 and is arranged downstream of this in the flow direction A and end region 9 ending in a tip 8. Between the jet shaping body 6 and the base body 4 of the housing 1 there is an annular flow channel 10 for the liquid, so that the jet shaping body 6 can be flowed around by the latter.
  • the beam shaping body 6 is in the base body 4 of the housing 1 by means of several web-shaped, the annular flow channel 10 bridging spokes 11 fixed. These extend in the axial direction over a substantial part of the main region 7 of the jet shaping body 6 and in this way function as flow guide surfaces which ensure an axial flow through the flow channel 10.
  • An elastically deformable funnel-shaped membrane 12 is arranged in the annular flow channel 10 in such a way that it tapers in the flow direction A from an outer circumference to an inner circumference.
  • the funnel membrane 12 is tightly connected to the housing 1 at its outer circumference 13.
  • a bead-shaped edge region 14 extends along the outer circumference 13 of the funnel membrane 12. This is clamped between a clamping ring 15 and a clamping sleeve 16, both of which are received in the base body 4 of the housing 1 and at the end each one is attached to the bead-shaped design of the edge region 14 of the Have funnel membrane 12 adapted profiling.
  • the clamping ring 15 is supported on a step 17 of the base body 4 of the housing 1;
  • the retaining ring 5 already mentioned above acts on the clamping sleeve 16.
  • a fixing of the retaining ring on the base body 4 of the housing 1 in the set position can be ensured via a grub screw (not shown) that can be screwed into the threaded bore 18.
  • the funnel membrane 12 the axial extent of which is dimensioned approximately in the same order of magnitude as its outer diameter, is dimensioned so that it can be without a supply of liquid to the Liquid inlet opening 2 rests with its inner circumference 19 on the outside of the jet shaping body 6, specifically on its conical end region 9 (cf. the operating state illustrated in the drawing). In this way, the funnel membrane 12 and jet shaping body 6 interact with one another to form a closure device 27.
  • the inner circumference 19 of the funnel membrane 12 lifts off the jet shaping body 6 and releases an annular passage opening, the cross-sectional area of which depends on the amount of liquid supplied or on the pressure prevailing upstream of the annular diaphragm 12.
  • the drawing shows the jet nozzle according to the relevant exemplary embodiment in the area relevant to the present invention. Accordingly, the jet nozzle can be designed to be more extensive, in particular on the inlet side, for example prepared for connection to a liquid supply or the like.
  • the jet nozzle according to the invention illustrated according to a second exemplary embodiment has to a considerable extent structural and functional parallels to the jet nozzle Fig. 1 on. These are expressed through the use of identical reference symbols for matching, functionally identical or corresponding components. A (renewed) description of the jet nozzle is dispensed with within the scope of the agreement and instead refer to the explanation of the above Fig. 1 referenced. As deviations to the jet nozzle after Fig. 1 the following aspects and peculiarities are to be emphasized here:
  • the beam shaping body 6 is constructed in two parts.
  • the second part 39 of the jet shaping body 6 is in turn part of a complex one-piece component, which additionally comprises a supporting ring 41 surrounding the jet shaping body 6 with the formation of an annular flow channel 10 at a distance, as well as several flat spokes 11, which the second part 39 of the jet shaping body 6 on the Support support ring 41.
  • the flat spokes 11 are in the present case in the form of twisted flow guide surfaces; they have the effect that a swirl flow is established in the annular flow channel 10.
  • the complex component consisting of the second part 39 of the jet shaping body 6, support ring 41 and spokes 11, an axial orientation of the flow guide surfaces so that no swirl flow is generated is possible.
  • the funnel membrane 12 the axial extent of which is again approximately of the same order of magnitude as its outer diameter, is accordingly with its edge region 14 between the - inserted into the housing 1 - supporting ring 41 and the clamping sleeve 16 clamped.
  • the support ring 41 and the clamping sleeve 16 are adapted to the profile of the edge region 14 of the funnel membrane 12.
  • the base body 4 of the housing 1 of the jet nozzle has a plurality of essentially radial openings 47 in the jet shaping region S.
  • the clamping sleeve 16 for its part has a corresponding number of openings 43 which are aligned with those of the base body 4 of the housing 1.
  • the interior of the housing 1 is laterally ventilated in the jet shape area S, which on the one hand supports undisturbed jet formation with different throughputs and orientations of the jet nozzle and on the other hand favors the drainage of any water that may have accumulated.
  • a rotation of the clamping sleeve 16 and the base body 4 of the housing 1 relative to one another is harmless for the ventilation mentioned if the base body 4 of the housing 1 and / or the clamping sleeve 16 have an annular circumferential groove 44 causing air distribution in the area of the separating surface.
  • the end 45 of the housing 1 of the jet nozzle assigned to the liquid inlet opening 2 is specifically designed for a reliable, tight connection with a hose or pipe.
  • the base body 4 of the housing 1 has two circumferential ribs 46 in that area.

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  • Nozzles (AREA)

Description

Die vorliegende Erfindung betrifft eine Flüssigkeitsstrahldüse, umfassend ein Gehäuse mit einer Flüssigkeitseintrittsöffnung, eine Strahlaustrittsöffnung und einen zwischen der Flüssigkeitseintrittsöffnung und der Strahlaustrittsöffnung angeordneten Strahlformbereich mit einem Strömungskanal, dessen Durchtrittsquerschnitt veränderbar ist.The present invention relates to a liquid jet nozzle, comprising a housing with a liquid inlet opening, a jet outlet opening and a jet shaping region with a flow channel, the passage cross section of which can be changed, arranged between the liquid inlet opening and the jet outlet opening.

Eine derartige Strahldüse ist beispielsweise aus der DE 102014018130 A1 bekannt. Wie in jenem Dokument näher ausgeführt, kommt es - anders als bei Sprühdüsen, die bestimmungsgemäß die Bildung feiner Tröpfchen bzw. eines Flüssigkeitsnebels bezwecken - bei Strahldüsen auf die Bildung eines Flüssigkeitsstrahls an, der über eine möglichst große Distanz nicht zerfällt. Um die angestrebte zuverlässige Strahlbildung auch bei unterschiedlichen Flüssigkeitsdurchsätzen durch die Strahldüse zu bewirken, weist die aus der DE 102014018130 A1 bekannte Strahldüse eine relativ zu dem Gehäuse und dem Strahlformkörper verschiebbare, mittels einer Federeinrichtung gegen die Umströmungsrichtung des Strahlformkörpers vorgespannte Drosselhülse auf, welche einen in einem mit dem Flüssigkeitseintritt kommunizierenden Vordruckraum des Gehäuses geführten Ringkolbenabschnitt und einen mit dem Konusbereich des Strahlformkörpers zusammenwirkenden, gemeinsam mit diesem einen ringförmigen Durchtrittsquerschnitt definierenden Durchgang mit sich in Abhängigkeit von dem jeweiligen Betriebszustand ändernder Querschnittsfläche aufweist.Such a jet nozzle is for example from the DE 102014018130 A1 known. As explained in more detail in that document, unlike spray nozzles, which are intended to form fine droplets or a liquid mist, jet nozzles depend on the formation of a liquid jet that does not disintegrate over the greatest possible distance. In order to achieve the desired reliable jet formation even with different liquid throughputs through the jet nozzle, the from the DE 102014018130 A1 known jet nozzle has a throttle sleeve which is displaceable relative to the housing and the jet shaping body and which is pretensioned by means of a spring device against the direction of flow around the jet shaping body, which has an annular piston section guided in a pre-pressure chamber of the housing communicating with the liquid inlet and an annular piston section which interacts with the cone area of the jet shaping body, together with this one having an annular passage cross-section defining passage with a cross-sectional area that changes as a function of the respective operating state.

Die FR 2 916 657 A1 offenbart eine mit einer Verschlussvorrichtung ausgestattete Flüssigkeits-Verteildüse. Diese umfasst zwei Komponenten, nämlich einen Grundkörper und ein Verschlussteil. Der - an einen Flüssigkeitsbehälter ansetzbare - Grundkörper umfasst einen durchströmbaren Rohrabschnitt und einen darin im Bereich des Flüssigkeitsaustritts angeordneten, in einem Kegel auslaufenden Kern, wobei zwischen dem Rohranschnitt und dem Kern ein ringförmiger Durchtrittsquerschnitt besteht. Das aus einem nachgiebigen Material (z. B. Elastomer) bestehende Verschlussteil weist einen den Rohrabschnitt außen umgebenden Mantelabschnitt und einen daran angeformten Trichterabschnitt auf. In Abhängigkeit von dem Flüssigkeitsdurchsatz durch den Ringraum erweitert und verengt sich der Trichterabschnitt des Verschlussteils, wobei ohne Flüssigkeitsdurchsatz der Trichterabschnitt an dem Kern anliegt und so die Flüssigkeits-Verteildüse verschließt.The FR 2 916 657 A1 discloses a liquid distribution nozzle equipped with a closure device. This comprises two components, namely a base body and a closure part. The base body, which can be attached to a liquid container, comprises a pipe section through which a flow can flow and a core which is arranged in the area of the liquid outlet and tapering off in a cone, with an annular passage cross-section between the pipe section and the core. The closure part, which is made of a flexible material (e.g. elastomer), has a jacket section surrounding the pipe section on the outside and a funnel section molded thereon. Depending on the liquid throughput through the annular space, the funnel section of the closure part expands and narrows, with the funnel section resting on the core without liquid throughput and thus closing the liquid distribution nozzle.

Die EP 2 949 593 A1 offenbart einen Tropfenspender, der konstruktiv sehr ähnlich aufgebaut ist wie die vorstehend gewürdigte Flüssigkeits-Verteildüse nach der FR 2 916 657 A1 .The EP 2 949 593 A1 discloses a drop dispenser which is structurally very similar to the liquid distribution nozzle recognized above according to the FR 2 916 657 A1 .

Die EP 2 478 773 A1 offenbart ein Ventilsystem, wie es in dem Gießen fließfähiger Massen dienenden Maschinen wie Schokolade etc. zum Einsatz kommt. Das Ventilsystem umfasst einen Adapter und mehrere (z. B. vier) an diesem fixierte, zu einem Ventil zusammengefügte Ventilklappen. Diese sind formänderbar und verformen sich unter der Einwirkung der Gießmasse. Durch spezifische Ausgestaltung der Ventilklappen (z. B. mittels Rippen) können diese sich beispielsweise beim Öffnen so verwinden, dass die zwischen Ihnen hindurchströmende Gießmasse einen Drall erhält.The EP 2 478 773 A1 discloses a valve system as it is used in machines such as chocolate, etc. which are used for pouring flowable masses. The valve system comprises an adapter and several (for example four) valve flaps which are fixed to this and joined together to form a valve. These can be shaped and deformed under the action of the casting compound. Through the specific design of the valve flaps (e.g. by means of ribs), these can For example, twist themselves when opening in such a way that the casting compound flowing between you is given a twist.

Die vorliegende Erfindung hat sich zum Ziel gesetzt, eine hinsichtlich des Betriebsverhaltens weiter verbesserte Strahldüse der eingangs angegebenen Art bereit zu stellen, wobei insbesondere eine verbesserte Reproduzierbarkeit der Strahlbildung bei sich ändernden Flüssigkeitsdurchsätzen angestrebt wird.The present invention has set itself the goal of providing a jet nozzle of the type specified at the outset which is further improved in terms of the operating behavior, the aim being in particular to improve the reproducibility of jet formation with changing liquid throughputs.

Gelöst wird die vorstehende Aufgabenstellung gemäß der vorliegenden Erfindung dadurch, dass bei einer Strahldüse der eingangs angegebenen Art in Kombination miteinander

  • in dem Gehäuse ein umströmbarer Strahlformkörper mit einem sich in Richtung auf die Strahlaustrittsöffnung verjüngenden Endbereich angeordnet ist,
  • zwischen dem Gehäuse und dem Strahlformkörper auf zumindest einem Teil von dessen axialer Länge ein ringförmiger Strömungskanal ausgebildet ist,
  • im Strahlformbereich der Strömungskanal radial außen von einer elastisch verformbaren, an ihrem Außenumfang dauerhaft dicht an dem Gehäuse angeschlossenen, sich in Durchströmungsrichtung verjüngenden Trichtermembran begrenzt ist, die sich zur selbsttätigen Veränderung des Durchtrittsquerschnitts in Abhängigkeit von dem lokalen Flüssigkeitsdruck bei steigendem Flüssigkeitsdruck radial aufweitet und bei sinkendem Flüssigkeitsdruck radial zusammenzieht,
  • der veränderbare Durchtrittsquerschnitt ringförmig ausgeführt ist, indem der Strahlformkörper in die Trichtermembran hineinragt, und
  • das Gehäuse mindestens einen Durchbruch aufweist, durch den hindurch der Innenraum des Gehäuses im Strahlformbereich seitlich belüftet ist.
The above object is achieved according to the present invention in that, in the case of a jet nozzle of the type specified in the introduction, in combination with one another
  • In the housing, a flow shaping body is arranged with an end region tapering in the direction of the jet outlet opening,
  • an annular flow channel is formed between the housing and the jet shaping body on at least part of its axial length,
  • In the jet shape area, the flow channel is delimited radially on the outside by an elastically deformable funnel membrane that is permanently tightly connected to the housing on its outer circumference, tapering in the direction of flow, which expands radially to automatically change the passage cross-section depending on the local fluid pressure when the fluid pressure rises and when it falls Fluid pressure contracts radially,
  • the variable passage cross-section is designed to be annular in that the jet-shaping body protrudes into the funnel membrane, and
  • the housing has at least one opening through which the interior of the housing is laterally ventilated in the beam shaping area.

Bei der erfindungsgemäßen Flüssigkeitsstrahldüse wird somit der Durchtrittsquerschnitt, dessen Querschnittsfläche sich je nach den Betriebsbedingungen in Abhängigkeit von diesen ändert, durch eine elastisch verformbaren, an ihrem Außenumfang (größter Umfang) dauerhaft dicht an dem Gehäuse angeschlossene Trichtermembran definiert. In Abhängigkeit von dem lokalen, d. h. dem in der Trichtermembran herrschenden Flüssigkeitsdruck verändert diese ihre Geometrie. Bei steigendem Flüssigkeitsdruck weitet sich die Trichtermembran - in ihrem Bereich stromabwärts des dichten Anschlusses an dem Gehäuse - radial auf, und bei sinkendem Flüssigkeitsdruck zieht sich die Trichtermembran ebenda radial zusammen. Die elastisch verformbare Trichtermembran reagiert dabei unmittelbar und besonders feinfühlig auf jegliche Veränderung der herrschenden Betriebsbedingungen. Hysteresebedingte Einschränkungen der Reproduzierbarkeit, wie sie bei der aus der DE 102014018130 A1 bekannten gattungsgemäßen Strahldüse - mehr oder weniger ausgeprägt - durch Stick-Slip-Effekte des Drosselschiebers auftreten, lassen sich in Umsetzung der vorliegenden Erfindung vermeiden.In the liquid jet nozzle according to the invention, the passage cross-section, the cross-sectional area of which changes depending on the operating conditions, is defined by an elastically deformable funnel membrane permanently attached to the housing on its outer circumference (largest circumference). Depending on the local, ie the prevailing liquid pressure in the funnel membrane, the latter changes its geometry. When the liquid pressure rises, the funnel membrane expands radially - in its area downstream of the sealed connection on the housing - and when the liquid pressure drops, the funnel membrane contracts radially there. The elastically deformable funnel membrane reacts immediately and particularly sensitively to any change in the prevailing operating conditions. Restrictions on reproducibility caused by hysteresis, as shown in the DE 102014018130 A1 known generic jet nozzle - more or less pronounced - occur due to stick-slip effects of the throttle slide, can be avoided in the implementation of the present invention.

Erfindungsgemäß ist weiterhin in dem Gehäuse ein in die Trichtermembran hineinragender, umströmbarer Strahlformkörper angeordnet. Zwischen dem Gehäuse und dem Strahlformkörper ist dabei auf zumindest einem Teil von dessen axialer Länge ein ringförmiger Strömungskanal ausgebildet. Weiterhin weist der besagte Strahlformkörper einen sich in Richtung auf die Strahlaustrittsöffnung verjüngenden, besonders bevorzugt im Wesentlichen konischen, in einer Spitze auslaufenden Endbereich auf. Hierdurch entsteht ein solcher radial innen durch den Strahlformkörper und radial außen durch die Trichtermembran definierter ringförmiger Durchtrittsquerschnitt, dessen Querschnittsfläche über eine axiale Erstreckung in Durchströmungsrichtung der Strahldüse mehr oder weniger stetig abnimmt bei gleichzeitiger Orientierung der strömenden Flüssigkeit mit einer radial nach innen gerichteten Komponente. Hierdurch ergeben sich (infolge der über die besagte axiale Erstreckung sich vollziehenden stetigen Beschleunigung der durch den Durchtrittsquerschnitt hindurch tretenden Flüssigkeit) Strömungsverhältnisse, welche die Bildung eines stabilen Flüssigkeitsstrahls besonders begünstigen. Unterstützt wird eine ungestörte Strahlbildung bei unterschiedlichen Durchsätzen und Orientierungen der Strahldüse weiterhin durch die erfindungsgemäß vorgesehene seitliche Belüftung des Innenraums des Gehäuses im Strahlformbereich mittels des mindestens einen Durchbruchs des Gehäuses.According to the invention, there is also a flow around the housing which projects into the funnel membrane Beam shaping body arranged. An annular flow channel is formed between the housing and the jet shaping body over at least part of its axial length. Furthermore, the said jet shaping body has an end region which tapers in the direction of the jet outlet opening, particularly preferably essentially conical and tapering to a point. This creates such an annular passage cross-section defined radially on the inside by the jet shaping body and radially on the outside by the funnel membrane, the cross-sectional area of which decreases more or less steadily over an axial extent in the direction of flow of the jet nozzle with simultaneous orientation of the flowing liquid with a component directed radially inward. This results in flow conditions (as a result of the constant acceleration of the liquid passing through the passage cross section taking place over the said axial extent) which particularly favor the formation of a stable liquid jet. An undisturbed jet formation with different throughputs and orientations of the jet nozzle is further supported by the lateral ventilation of the interior of the housing in the jet shaping area provided according to the invention by means of the at least one opening in the housing.

Lediglich zur Vermeidung von Missverständnissen ist darauf hinzuweisen, dass die Angabe, wonach die elastisch verformbare Trichtermembran an ihrem Außenumfang "dauerhaft" dicht an dem Gehäuse angeschlossen ist, nicht im Sinne einer permanenten bzw. unlösbaren Verbindung von Trichtermembran und Gehäuse fehlinterpretiert werden darf; vielmehr bringt diese Angabe lediglich zum Ausdruck, dass sich durch eine Änderung des Betriebszustandes der Strahldüse, insbesondere durch die druckabhängige Aufweitung bzw. Verengung der Trichtermembran im Strahlformbereich, nichts an dem dichten Anschluss der Trichtermembran (an ihrem Außenumfang) an dem Gehäuse ändert. Im Übrigen unterfällt, worauf vorsorglich hinzuweisen ist, eine sich aufgrund eines steigenden Flüssigkeitsdrucks einstellende Verformung der Trichtermembran, welche neben einer radialen Aufweitung auch einen axialen Verformungsanteil beinhaltet, uneingeschränkt der vorstehenden Definition der vorliegenden Erfindung.Merely to avoid misunderstandings it should be pointed out that the statement according to which the elastically deformable funnel membrane is "permanently" tightly connected to the housing on its outer circumference, not in the sense of a permanent or permanent connection of Funnel membrane and housing may be misinterpreted; Rather, this information merely expresses that a change in the operating state of the jet nozzle, in particular due to the pressure-dependent expansion or narrowing of the funnel membrane in the jet shape area, does not change anything in the tight connection of the funnel membrane (on its outer circumference) to the housing. Incidentally, as a precautionary measure, a deformation of the funnel membrane that occurs due to an increasing liquid pressure, which in addition to a radial expansion also includes an axial deformation component, is subject without restriction to the above definition of the present invention.

Zusätzlich zu ihrer besonders feinfühligen Dosier- und Regelfunktion kann die Trichtermembran - bei geeigneter sonstiger Ausführung der Flüssigkeitsstrahldüse nach einer bevorzugten Weiterbildung (s. u.) - gleichzeitig auch zuverlässig die Funktion eines Verschlusses bei auf Null zurückgehendem Flüssigkeitsdurchsatz erfüllen. Dies gilt insbesondere bei einer ringförmigen Ausführung des Durchtrittsquerschnitts, indem dieser radial außen von der Trichtermembran und radial innen von einem in diese hineinragenden Strahlformkörper begrenzt ist, wobei der Innenumfang (geringster Umfang) der Trichtermembran der Außenfläche des Strahlformkörpers gegenübersteht. Bei auf Null zurückgehendem Flüssigkeitsdurchsatz kann sich die elastische ringförmige Trichtermembran - mit ihrem Innenumfang - außen an den Strahlformkörper anlegen und auf diese Weise den (ringförmigen) Durchtrittsquerschnitt vollständig verschließen. Allerdings kann im Rahmen der vorliegenden Erfindung auch eine - stromaufwärts der elastischen Trichtermembran angeordnete - gesonderte Verschlusseinrichtung angeordnet sein. Gegebenenfalls kann diese Verschlusseinrichtung ihrerseits eine elastische Membran, welche eine Rückschlagfunktion erfüllt, umfassen.In addition to its particularly sensitive metering and regulating function, the funnel membrane - with a suitable other design of the liquid jet nozzle according to a preferred development (see below) - can simultaneously also reliably perform the function of a closure when the liquid throughput has decreased to zero. This applies in particular to an annular design of the passage cross-section in that it is delimited radially on the outside by the funnel membrane and radially on the inside by a jet-shaping body protruding into it, the inner circumference (smallest circumference) of the funnel-shaped membrane facing the outer surface of the jet-shaping body. When the liquid throughput drops to zero, the elastic ring-shaped funnel membrane can - with its inner circumference - rest on the outside of the jet-shaping body and in this way completely close the (ring-shaped) passage cross-section. However, under the In the present invention, a separate closure device can also be arranged upstream of the elastic funnel membrane. If necessary, this closure device can in turn comprise an elastic membrane which fulfills a non-return function.

Während eine solche Gestaltung im Rahmen der vorliegenden Erfindung nicht unbedingt zwingend ist, so zeichnet sich doch eine andere bevorzugte Weiterbildung der erfindungsgemäßen Flüssigkeitsstrahldüse dadurch aus, dass der Strahlformkörper unbeweglich in dem Gehäuse angeordnet ist. Speichenartige Strukturen, die stromaufwärts der Trichtermembran in einem zwischen dem Gehäuse und dem Strahlformkörper bestehenden Ringraum vorgesehen sind und den Strahlformkörper halten, können dabei durch geeignete Dimensionierung und/oder Profilierung weiterhin auch noch Strömungsleitflächen bilden.While such a design is not absolutely necessary within the scope of the present invention, another preferred development of the liquid jet nozzle according to the invention is characterized in that the jet shaped body is arranged immovably in the housing. Spoke-like structures, which are provided upstream of the funnel membrane in an annular space existing between the housing and the jet-shaping body and hold the jet-shaping body, can furthermore also form flow guide surfaces through suitable dimensioning and / or profiling.

Und auch die Trichtermembran ist besonders bevorzugt an ihrem Außenumfang unbeweglich in dem Gehäuse fixiert. Auf diese Weise lässt sich nicht nur die erfindungsgemäße Flüssigkeitsstrahldüse mit einem besonders geringen Herstellungsaufwand fertigen. Durch Wegfall einer Beweglichkeit des Strahlformkörpers bzw. der Trichtermembran an ihrem Außenumfang sind auch die weiter oben beschriebenen, im Hinblick auf die hervorragende Reproduzierbarkeit des Betriebsverhaltens relevanten Gesichtspunkte besonders ausgeprägt.And the funnel membrane is particularly preferably fixed immovably in the housing on its outer circumference. In this way, not only can the liquid jet nozzle according to the invention be manufactured with a particularly low manufacturing cost. By eliminating the mobility of the jet shaping body or the funnel membrane on its outer circumference, the aspects described above and relevant with regard to the excellent reproducibility of the operating behavior are particularly pronounced.

Gemäß einer abermals anderen bevorzugten Weiterbildung der vorliegenden Erfindung weist die Trichtermembran einen wulstförmig ausgeführten äußeren Randbereich auf. Dies ist günstig im Hinblick auf eine dichte und dauerhaft feste Fixierung der Trichtermembran an deren Außenumfang im Gehäuse der Flüssigkeitsstrahldüse mit einfachen Mitteln. In diesem Sinne kann insbesondere im Bereich der Strahlaustrittsöffnung des Gehäuses ein demontierbarer Haltering vorgesehen sein, der auf eine Klemmhülse wirkt, die ihrerseits eine Fixierung des Außenumfangs der Trichtermembran in dem Gehäuse (an dem wulstförmig ausgeführten äußeren Randbereich der Trichtermembran) bewirkt.According to yet another preferred development of the present invention, the funnel membrane has a bead-shaped outer edge region. This is favorable with regard to a tight and permanent fixation of the funnel membrane on its outer circumference in the housing of the liquid jet nozzle with simple means. In this sense, a detachable retaining ring can be provided in the area of the jet outlet opening of the housing, which acts on a clamping sleeve, which in turn fixes the outer circumference of the funnel membrane in the housing (on the bead-shaped outer edge area of the funnel membrane).

Schließlich ist für die angestrebte Bildung eines besonders stabilen Flüssigkeitsstrahls günstig, wenn die Flüssigkeitseintrittsöffnung der Strahlaustrittsöffnung gegenüberliegend angeordnet ist; denn auf diese Weise entfallen Strömungsumlenkungen, die sich unter bestimmten Betriebsbedingungen auf die Bildung eines besonders stabilen Flüssigkeitsstrahls nachteilig auswirken können.Finally, it is favorable for the desired formation of a particularly stable liquid jet if the liquid inlet opening is arranged opposite the jet outlet opening; because in this way there are no flow deflections which, under certain operating conditions, can have a detrimental effect on the formation of a particularly stable liquid jet.

Im Folgenden wird die vorliegende Erfindung anhand der Zeichnung näher erläutert. Dabei zeigt

Fig. 1
in einem perspektivischen Axialschnitt ein dem Verständnis der vorliegenden Erfindung dienendes Vergleichsbeispiel und
Fig. 2
in einem perspektivischen Axialschnitt und
Fig. 3
in einem orthogonalen Axialschnitt ein bevorzugtes Ausführungsbeispiel der Erfindung.
The present invention is explained in more detail below with reference to the drawing. It shows
Fig. 1
in a perspective axial section a comparative example serving to understand the present invention and
Fig. 2
in a perspective axial section and
Fig. 3
a preferred embodiment of the invention in an orthogonal axial section.

Die in Fig. 1 der Zeichnung dargestellte Flüssigkeitsstrahldüse umfasst ein Gehäuse 1, welches eine Flüssigkeitseintrittsöffnung 2 und eine Strahlaustrittsöffnung 3 aufweist. Die Flüssigkeitseintrittsöffnung 2 und die Strahlaustrittsöffnung 3 liegen dabei - bezogen auf die Durchströmungsrichtung A - einander gegenüber, so dass der in einem Strahlformbereich S gebildete Flüssigkeitsstrahl die Strahldüse in der gleichen Richtung verlässt, in der die Flüssigkeit durch die Flüssigkeitseintrittsöffnung 2 in die Strahldüse eintritt.In the Fig. 1 The liquid jet nozzle shown in the drawing comprises a housing 1 which has a liquid inlet opening 2 and a jet outlet opening 3. The liquid inlet opening 2 and the jet outlet opening 3 lie opposite one another - based on the flow direction A - so that the liquid jet formed in a jet shape area S leaves the jet nozzle in the same direction in which the liquid enters the jet nozzle through the liquid inlet opening 2.

Das Gehäuse 1 umfasst einen etwa hülsenförmigen Grundkörper 4 und einen endseitig im Bereich der Strahlaustrittsöffnung 3 des Gehäuses 1 auf den Grundkörper 4 aufgeschraubten Haltering 5, dessen Funktion weiter unten im Detail erläutert wird.The housing 1 comprises an approximately sleeve-shaped base body 4 and a retaining ring 5 screwed onto the base body 4 at the end in the region of the jet outlet opening 3 of the housing 1, the function of which is explained in detail below.

Im Inneren des Grundkörpers 4 des Gehäuses 1 der Strahldüse erstreckt sich längs zu deren Achse ein Strahlformkörper 6. Dieser weist einen im Wesentlichen zylindrischen Hauptbereich 7 und einen - in Durchströmungsrichtung A stromabwärts von diesem angeordneten - sich in Richtung auf die Strahlaustrittsöffnung 3 verjüngenden, konisch ausgeführten und in einer Spitze 8 auslaufenden Endbereich 9 auf. Zwischen dem Strahlformkörper 6 und dem Grundkörper 4 des Gehäuses 1 besteht ein ringförmiger Strömungskanal 10 für die Flüssigkeit, so dass der Strahlformkörper 6 von letzterer umströmbar ist. Der Strahlformkörper 6 ist in dem Grundkörper 4 des Gehäuses 1 mittels mehrerer stegförmiger, den ringförmigen Strömungskanal 10 überbrückender Speichen 11 fixiert. Diese erstrecken sich in axialer Richtung über einen wesentlichen Teil des Hauptbereichs 7 des Strahlformkörpers 6 und fungieren auf diese Weise als Strömungsleitflächen, die eine axiale Durchströmung des Strömungskanals 10 sicherstellen.In the interior of the base body 4 of the housing 1 of the jet nozzle, a jet shaping body 6 extends along its axis. This has a substantially cylindrical main region 7 and a conical design which tapers in the direction of the jet outlet opening 3 and is arranged downstream of this in the flow direction A and end region 9 ending in a tip 8. Between the jet shaping body 6 and the base body 4 of the housing 1 there is an annular flow channel 10 for the liquid, so that the jet shaping body 6 can be flowed around by the latter. The beam shaping body 6 is in the base body 4 of the housing 1 by means of several web-shaped, the annular flow channel 10 bridging spokes 11 fixed. These extend in the axial direction over a substantial part of the main region 7 of the jet shaping body 6 and in this way function as flow guide surfaces which ensure an axial flow through the flow channel 10.

In dem ringförmigen Strömungskanal 10 ist eine elastisch verformbare trichterförmige Membran 12 dergestalt angeordnet, dass sie sich in Durchströmungsrichtung A von einem Außenumfang auf einen Innenumfang verjüngt. Die Trichtermembran 12 ist an ihrem Außenumfang 13 dicht an dem Gehäuse 1 angeschlossen. Hierzu erstreckt sich längs des Außenumfangs 13 der Trichtermembran 12 ein wulstförmiger Randbereich 14. Dieser ist zwischen einem Klemmring 15 und einer Klemmhülse 16 eingespannt, die beide in dem Grundkörper 4 des Gehäuses 1 aufgenommen sind und stirnseitig jeweils eine an die wulstförmige Ausführung des Randbereichs 14 der Trichtermembran 12 angepasste Profilierung aufweisen. Der Klemmring 15 stützt sich dabei an einer Stufe 17 des Grundkörpers 4 des Gehäuses 1 ab; auf die Klemmhülse 16 wirkt demgegenüber der weiter oben bereits erwähnte Haltering 5. Eine Fixierung des Halteringes an dem Grundkörper 4 des Gehäuses 1 in der eingestellten Position lässt sich über eine in die Gewindebohrung 18 einschraubbare (nicht dargestellte) Madenschraube gewährleisten.An elastically deformable funnel-shaped membrane 12 is arranged in the annular flow channel 10 in such a way that it tapers in the flow direction A from an outer circumference to an inner circumference. The funnel membrane 12 is tightly connected to the housing 1 at its outer circumference 13. For this purpose, a bead-shaped edge region 14 extends along the outer circumference 13 of the funnel membrane 12. This is clamped between a clamping ring 15 and a clamping sleeve 16, both of which are received in the base body 4 of the housing 1 and at the end each one is attached to the bead-shaped design of the edge region 14 of the Have funnel membrane 12 adapted profiling. The clamping ring 15 is supported on a step 17 of the base body 4 of the housing 1; On the other hand, the retaining ring 5 already mentioned above acts on the clamping sleeve 16. A fixing of the retaining ring on the base body 4 of the housing 1 in the set position can be ensured via a grub screw (not shown) that can be screwed into the threaded bore 18.

Die Trichtermembran 12, deren axiale Erstreckung etwa in der gleichen Größenordnung bemessen ist wie ihr Außendurchmesser, ist so dimensioniert, dass sie ohne eine Zufuhr von Flüssigkeit zu der Flüssigkeitseintrittsöffnung 2 mit ihrem Innenumfang 19 außen an dem Strahlformkörper 6 anliegt, und zwar an dessen konischem Endbereich 9 (vgl. den in der Zeichnung veranschaulichten Betriebszustand). Auf diese Weise bilden die Trichtermembran 12 und Strahlformkörper 6 im Zusammenwirken miteinander eine Verschlusseinrichtung 27. Bei Zufuhr von Flüssigkeit zu der Flüssigkeitseintrittsöffnung 2 des Gehäuses 1 hebt der Innenumfang 19 der Trichtermembran 12 demgegenüber von dem Strahlformkörper 6 ab und gibt eine ringförmige Durchtrittsöffnung frei, deren Querschnittsfläche sich nach der Menge der zugeführten Flüssigkeit bzw. nach dem stromaufwärts der Ringmembran 12 herrschenden Druck richtet.The funnel membrane 12, the axial extent of which is dimensioned approximately in the same order of magnitude as its outer diameter, is dimensioned so that it can be without a supply of liquid to the Liquid inlet opening 2 rests with its inner circumference 19 on the outside of the jet shaping body 6, specifically on its conical end region 9 (cf. the operating state illustrated in the drawing). In this way, the funnel membrane 12 and jet shaping body 6 interact with one another to form a closure device 27. When liquid is supplied to the liquid inlet opening 2 of the housing 1, the inner circumference 19 of the funnel membrane 12 lifts off the jet shaping body 6 and releases an annular passage opening, the cross-sectional area of which depends on the amount of liquid supplied or on the pressure prevailing upstream of the annular diaphragm 12.

Nur zur Vermeidung von Missverständnissen ist darauf hinzuweisen, dass die Zeichnung die Strahldüse gemäß dem betreffenden Ausführungsbeispiel in dem für die vorliegende Erfindung maßgeblichen Bereich zeigt. Demnach kann die Strahldüse insbesondere eintrittsseitig weitergehend gestaltet sein kann, beispielsweise für den Anschluss an eine Flüssigkeitszufuhr oder dergleichen vorbereitet.Only to avoid misunderstandings, it should be pointed out that the drawing shows the jet nozzle according to the relevant exemplary embodiment in the area relevant to the present invention. Accordingly, the jet nozzle can be designed to be more extensive, in particular on the inlet side, for example prepared for connection to a liquid supply or the like.

Die in den Figuren 2 und 3 veranschaulichte erfindungsgemäße Strahldüse nach einem zweiten Ausführungsbeispiel weist in einem erheblichen Umfang bauliche und funktionale Parallelen zu der Strahldüse nach Fig. 1 auf. Diese kommen durch Verwendung identischer Bezugszeichen für übereinstimmende, funktionsgleiche bzw. einander entsprechende Bauteile zum Ausdruck. Im Umfang der Übereinstimmungen wird auf eine (erneute) Beschreibung der Strahldüse verzichtet und stattdessen auf die vorstehenden Erläuterung der Fig. 1 verwiesen. Als Abweichungen zu der Strahldüse nach Fig. 1 sind hier sind hier folgende Aspekte und Besonderheiten hervorzuheben:
Der Strahlformkörper 6 ist zweiteilig aufgebaut. Er umfasst (zuströmseitig) einen ersten Teil 37 in Form einer im Wesentlichen konischen Anströmkappe 38, welche mit dem den Hauptbereich 7 und den (abströmseitigen) Endbereich 9 umfassenden zweiten Teil 39 mittels einer Steckverbindung 40 verbunden ist. Der zweite Teil 39 des Strahlformkörpers 6 ist dabei seinerseits Teil eines komplexen einstückigen Bauteils, welches zusätzlich einen den Strahlformkörper 6 unter Ausbildung eines ringförmigen Strömungskanals 10 mit Abstand umgebenden Tragring 41 sowie mehrere flächige Speichen 11 umfasst, welche den zweiten Teil 39 des Strahlformkörpers 6 an dem Tragring 41 abstützen. Die flächigen Speichen 11 sind dabei vorliegend in Form von verdrillten Strömungsleitflächen ausgeführt; sie bewirken, dass sich in dem ringförmigen Strömungskanal 10 eine Drallströmung einstellt. Für eine besonders vorteilhafte Beeinflussung der Strömungssituation weisen sie jeweils zwei Schlitze 42 auf. Alternativ ist bei im Übrigen gleicher Bauweise des komplexen Bauteils aus zweitem Teil 39 des Strahlformkörpers 6, Tragring 41 und Speichen 11 eine axiale Orientierung der Strömungsleitflächen, so dass keine Drallströmung erzeugt wird, möglich.The ones in the Figures 2 and 3 The jet nozzle according to the invention illustrated according to a second exemplary embodiment has to a considerable extent structural and functional parallels to the jet nozzle Fig. 1 on. These are expressed through the use of identical reference symbols for matching, functionally identical or corresponding components. A (renewed) description of the jet nozzle is dispensed with within the scope of the agreement and instead refer to the explanation of the above Fig. 1 referenced. As deviations to the jet nozzle after Fig. 1 the following aspects and peculiarities are to be emphasized here:
The beam shaping body 6 is constructed in two parts. It comprises (on the inflow side) a first part 37 in the form of an essentially conical inflow cap 38, which is connected to the second part 39 comprising the main area 7 and the (outflow side) end area 9 by means of a plug connection 40. The second part 39 of the jet shaping body 6 is in turn part of a complex one-piece component, which additionally comprises a supporting ring 41 surrounding the jet shaping body 6 with the formation of an annular flow channel 10 at a distance, as well as several flat spokes 11, which the second part 39 of the jet shaping body 6 on the Support support ring 41. The flat spokes 11 are in the present case in the form of twisted flow guide surfaces; they have the effect that a swirl flow is established in the annular flow channel 10. For a particularly advantageous influencing of the flow situation, they each have two slots 42. Alternatively, with the otherwise identical construction of the complex component consisting of the second part 39 of the jet shaping body 6, support ring 41 and spokes 11, an axial orientation of the flow guide surfaces so that no swirl flow is generated is possible.

Die Trichtermembran 12, deren axiale Erstreckung wiederum etwa in der gleichen Größenordnung bemessen ist wie ihr Außendurchmesser, ist demnach mit ihrem Randbereich 14 zwischen dem - in das Gehäuse 1 eingesetzten - Tragring 41 und der Klemmhülse 16 eingespannt. Für einen festen Sitz der Trichtermembran 12 sind der Tragring 41 und die Klemmhülse 16 an die Profilierung des Randbereichs 14 der Trichtermembran 12 angepasst.The funnel membrane 12, the axial extent of which is again approximately of the same order of magnitude as its outer diameter, is accordingly with its edge region 14 between the - inserted into the housing 1 - supporting ring 41 and the clamping sleeve 16 clamped. For a secure fit of the funnel membrane 12, the support ring 41 and the clamping sleeve 16 are adapted to the profile of the edge region 14 of the funnel membrane 12.

Der Grundkörper 4 des Gehäuses 1 der Strahldüse weist im Strahlformbereich S mehrere im Wesentlichen radiale Durchbrüche 47 auf. Und die Klemmhülse 16 verfügt ihrerseits über eine entsprechende Anzahl von Durchbrüchen 43, welche zu denen des Grundkörpers 4 des Gehäuses 1 fluchten. So ist mittels jener Durchbrüche 47 und 43 der Innenraum des Gehäuses 1 im Strahlformbereich S seitlich belüftet, was einerseits eine ungestörte Strahlbildung bei unterschiedlichen Durchsätzen und Orientierungen der Strahldüse unterstützt und andererseits das Ablaufen von ggf. angesammeltem Wasser begünstigt. Eine Verdrehung von Klemmhülse 16 und Grundkörper 4 des Gehäuses 1 relativ zueinander ist für die besagte Belüftung unschädlich, wenn der Grundkörper 4 des Gehäuses 1 und/oder die Klemmhülse 16 im Bereich der Trennfläche eine ringförmige, eine Luftverteilung bewirkende Umfangsnut 44 aufweisen.The base body 4 of the housing 1 of the jet nozzle has a plurality of essentially radial openings 47 in the jet shaping region S. And the clamping sleeve 16 for its part has a corresponding number of openings 43 which are aligned with those of the base body 4 of the housing 1. By means of those openings 47 and 43, the interior of the housing 1 is laterally ventilated in the jet shape area S, which on the one hand supports undisturbed jet formation with different throughputs and orientations of the jet nozzle and on the other hand favors the drainage of any water that may have accumulated. A rotation of the clamping sleeve 16 and the base body 4 of the housing 1 relative to one another is harmless for the ventilation mentioned if the base body 4 of the housing 1 and / or the clamping sleeve 16 have an annular circumferential groove 44 causing air distribution in the area of the separating surface.

Weiterhin ist das der Flüssigkeitseintrittsöffnung 2 zugeordnete Ende 45 des Gehäuses 1 der Strahldüse spezifisch für eine zuverlässige dichte Verbindung mit einem Schlauch bzw. Rohr hergerichtet. Hierzu weist der Grundkörper 4 des Gehäuses 1 in jenem Bereich zwei umlaufende Rippen 46 auf. Insgesamt ergibt bei der in den Figuren 2 und 3 gezeigten Bauweise sich erkennbar eine ausgesprochen kompakte Strahldüse mit integrierter Verschlussfunktion.Furthermore, the end 45 of the housing 1 of the jet nozzle assigned to the liquid inlet opening 2 is specifically designed for a reliable, tight connection with a hose or pipe. For this purpose, the base body 4 of the housing 1 has two circumferential ribs 46 in that area. Overall results in the Figures 2 and 3 The construction shown is recognizable extremely compact jet nozzle with integrated locking function.

Claims (12)

  1. A liquid jet nozzle with the following characteristics:
    - it comprises a housing (1) with a liquid entry opening (2) and a jet exit opening (3);
    - a flow-enveloped jet-forming body (6) with an end region (9) tapering in direction of the jet exit opening is arranged in the housing (1);
    - an annual flow channel (10) is formed between the housing (1) and the jet-forming body (6) over at least part of its axial length;
    - a jet-forming area (S) with a flow channel is arranged between the liquid entry opening (2) and the jet exit opening (3), the passage cross-section being variable;
    - to this end the flow-channel in the jet-forming area (S) is limited radially outside by an elastically deformable funnel membrane (12) permanently tightly connected to the housing (1) and tapering in flow-through direction (A), wherein the funnel membrane, for automatically changing the passage cross-section in dependence of the local liquid pressure, radially widens for a rise in liquid pressure and radially contracts for a drop in liquid pressure;
    - the variable passage cross-section is constructed in an annular manner in that the jet-forming body (6) protrudes into the funnel membrane (12), and
    - the housing (1) comprises at least one breakthrough (47), through which the internal chamber of the housing (1) is laterally aerated in the jet-forming area (S).
  2. The liquid jet nozzle according to claim 1, characterised in that the tapering end region (9) of the jet-forming body (6) is constructed substantially conically, wherein the jet-forming body (6) in flow direction preferably terminates in a point (8).
  3. The liquid jet nozzle according to claim 1 or claim 2, characterised in that the jet-forming body (6) is arranged immovably in the housing (1).
  4. The liquid jet nozzle according to one of claims 1 to 3, characterised in that upstream of the funnel membrane (12), in an annular chamber existing between the housing (1) and the jet-forming body (6), spokes (11) supporting the jet-forming body (6) are provided, which are especially preferably configured as flow-guiding surfaces.
  5. The liquid jet nozzle according to claim 4, characterised in that the spokes (11) comprise breakthroughs constructed as slits (42).
  6. The liquid jet nozzle according to one of claims 1 to 5, characterised in that it is constructed as a closing nozzle with a closing device (27) arranged downstream of the liquid entry opening (2) and openable and closable in dependence of a pre-pressure.
  7. The liquid jet nozzle according to claim 6, characterised in that the funnel membrane (12) forms part of the closing device (27), in that without any supply of liquid to the liquid entry opening (2) it is with its inner circumference (19) in contact with the jet-forming body (6) on the outside, wherein when liquid is supplied to the liquid entry opening (2) the internal circumference (19) of the funnel membrane (12) lifts off the jet-forming body (6)and exposes an annular passage opening.
  8. The liquid jet nozzle according to claim 7, characterised in that the inner circumference (19) of the funnel membrane (12) is in contact with the jet-forming body (6) in the tapering end region (9) thereof.
  9. The liquid jet nozzle according to one of claims 1 to 8, characterised in that the wall thickness of the funnel membrane (12) decreases in flow-through direction.
  10. The liquid jet nozzle according to one of claims 1 to 9, characterised in that the funnel membrane (12) at its outer circumference (13) is immovably fixed in the housing (1).
  11. The liquid jet nozzle according to one of claims 1 to 10, characterised in that the funnel membrane (12) comprises a bead-shaped outer edge region (14).
  12. The liquid jet nozzle according to one of claims 1 to 11, characterised in that the housing (1) is flown through axially in that the liquid entry opening (2) is arranged opposite the jet exit opening (3).
EP17828660.5A 2016-12-09 2017-12-05 Liquid-jet nozzle Active EP3551335B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016123994.1A DE102016123994A1 (en) 2016-12-09 2016-12-09 liquid jet nozzle
PCT/EP2017/081450 WO2018104266A1 (en) 2016-12-09 2017-12-05 Liquid-jet nozzle

Publications (2)

Publication Number Publication Date
EP3551335A1 EP3551335A1 (en) 2019-10-16
EP3551335B1 true EP3551335B1 (en) 2021-06-16

Family

ID=60954989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17828660.5A Active EP3551335B1 (en) 2016-12-09 2017-12-05 Liquid-jet nozzle

Country Status (4)

Country Link
US (1) US20190299225A1 (en)
EP (1) EP3551335B1 (en)
DE (1) DE102016123994A1 (en)
WO (1) WO2018104266A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114178065A (en) * 2021-11-22 2022-03-15 拉思丁科技(深圳)有限公司 High-pressure water jet gem nozzle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2916657B1 (en) * 2007-05-30 2009-08-21 Techniplast Sarl DEVICE FOR SEALING A FLUID DISTRIBUTION NOZZLE
DK2478773T3 (en) * 2011-01-25 2013-08-26 Buehler Ag Molding Machine Valve
FR3021303A1 (en) * 2014-05-26 2015-11-27 Techniplast IMPROVED DROP DISTRIBUTION APPARATUS
DE102014018130A1 (en) 2014-12-09 2016-06-09 Aebi Schmidt Nederland Bv Liquid jet shut-off

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3551335A1 (en) 2019-10-16
US20190299225A1 (en) 2019-10-03
DE102016123994A1 (en) 2018-06-14
WO2018104266A1 (en) 2018-06-14

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