EP1992414B1 - Spray nozzle - Google Patents
Spray nozzle Download PDFInfo
- Publication number
- EP1992414B1 EP1992414B1 EP08007838A EP08007838A EP1992414B1 EP 1992414 B1 EP1992414 B1 EP 1992414B1 EP 08007838 A EP08007838 A EP 08007838A EP 08007838 A EP08007838 A EP 08007838A EP 1992414 B1 EP1992414 B1 EP 1992414B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outlet opening
- boundary
- mouthpiece
- sections
- spray nozzle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—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
- B05B1/04—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 flat form, e.g. fan-like, sheet-like
- B05B1/042—Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—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
- B05B1/04—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 flat form, e.g. fan-like, sheet-like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S239/00—Fluid sprinkling, spraying, and diffusing
- Y10S239/19—Nozzle materials
Definitions
- the invention relates to a spray nozzle, in particular a high-pressure nozzle for descaling steel products, with a mouthpiece, wherein the mouthpiece has an outlet opening and an outlet chamber, which tapers to the outlet opening tapers.
- Known high-pressure nozzles for descaling steel products are designed as flat jet nozzles.
- the mouthpiece for such Entzu mattersdüsen usually has an outlet opening, which is followed by a jet-forming outlet cone.
- a generic spray nozzle ie a mouthpiece for a Entzu concerningsdüse shown in which a in the direction of the outlet opening to be tapered outlet chamber after the outlet opening into conically widening edge surfaces of the mouthpiece passes. These edge surfaces limit the flat jet formed in its lateral extent.
- the outlet opening and the outlet cone can be elliptical.
- an improved high-pressure nozzle is to be provided.
- a high-pressure nozzle in particular for descaling steel products, is provided with a mouthpiece, the mouthpiece having an outlet opening and an outlet chamber tapering towards the outlet opening, wherein the outlet opening has a curved surface, for example, viewed from the outlet chamber a convex or concave surface, spans and in which a surface surrounding the boundary of the outlet opening at each point of the boundary in the radial direction at an angle between 65 ° and 95 °, in particular 90 °, to the central longitudinal axis abuts the boundary of the outlet opening.
- An end face of the mouthpiece surrounding the outlet opening abuts the boundary of the outlet opening at any angle between 85 ° and 95 °, in particular 90 ° to the central longitudinal axis, whereby the advantages of the invention can be utilized up to an angle of approximately 65 ° .
- At the boundary of the outlet opening of the water jet thus leaves the nozzle and downstream of the outlet opening no water-carrying components of the nozzle are no longer provided.
- By being at the Boundary of the outlet opening abuts the surrounding surface at an angle of about 90 ° to the central longitudinal axis of the boundary, a sharp spoiler for the outgoing beam is created.
- a very stable design of the mouthpiece can be achieved, which withstands even the highest pressures.
- the angle at which the surrounding end face of the mouthpiece abuts the boundary of the outlet opening is approximately rectangular at each point of the boundary, substantially equal conditions are created at the tear-off edge around the entire circumference of the exiting jet. This also contributes to a very clean design of the desired flat fan cone.
- the area surrounding the boundary of the outlet opening ends on the side facing away from the outlet opening, preferably on a circle concentrically surrounding the central longitudinal axis. In this way, the irregularly shaped surface surrounding the outlet opening can be returned to a regular geometric shape.
- the surface surrounding the boundary of the outlet opening has first sections which are arranged on a first position or in a first area along the central longitudinal axis, and second sections which are arranged on a second position, wherein the second position and the second region from the first position and from the first region in the outflow direction along the central longitudinal axis are spaced apart.
- the surface surrounding the boundary of the outlet opening is subdivided into four sections, wherein two opposing sections are arranged in the first section and two further opposite sections are arranged in the second section.
- air taken in by the outgoing jet can be supplied symmetrically over the sections arranged in the upstream first region.
- the boundary of the outlet opening is defined by an intersection of a cone, in particular a circular cone, with a curved ellipse.
- the advantages according to the invention are also achieved if regular geometric shapes, namely, for example, a circular cone with a curved Ellipse, to be cut.
- the mouthpiece made of hard metal.
- the mouthpiece is held in a nozzle housing, wherein the nozzle housing seen in the direction of the central longitudinal axis of the nozzle has an outlet opening surrounding the oval passage opening.
- an oval passage opening is contributed to a high-strength design of the nozzle housing.
- the high-pressure nozzle according to the invention is designed as a flat jet nozzle, then an oval through-opening in the nozzle housing is better adapted to the cross-sectional shape of the flat jet than the circular through-openings usually used.
- more material may be left in sections on the nozzle housing than would be the case with a circular passage opening, thereby increasing the stability of the nozzle housing.
- the oval passage opening surrounding the exit opening has no function with respect to the jet formation. The spray emerging from the outlet opening does not touch the nozzle housing.
- the mouthpiece and / or the nozzle housing are produced by means of metal powder injection molding.
- metal powder injection molding essentially any shapes can be produced and in particular the shaping of the high-pressure nozzle according to the invention can be achieved in the area surrounding the outlet opening, even in mass production. Even when producing the mouthpiece made of hard metal or a hard metal alloy, this can be produced by metal powder injection molding.
- metal powder injection molding metal powder is first mixed with a thermoplastic binder. This mixture is then brought into a mold by injection molding. In a subsequent process step, the thermoplastic binder is removed chemically or thermally. There remains an intermediate component, which consists of a metal powder structure. This intermediate part is subsequently sintered, thereby obtaining a high material strength.
- the in the Fig. 14 and 15 illustrated high-pressure nozzle 10 has a mouthpiece 12 which is arranged in a nozzle housing 14. From the mouthpiece 12 exits a flat jet 16, the only in the Fig. 15 is indicated schematically. Connected to the nozzle housing 14 and disposed upstream of the mouthpiece 12 is a combined filter and jet director member 18.
- the filter and jet director member 18 provides a flow passage that terminates at the entrance to the mouthpiece 12. Liquid to be sprayed enters the flow channel through a filter region 20, is aligned by a jet funnel 22 and then reaches the mouthpiece 12.
- the nozzle housing 14 with the mouthpiece 12 and the combined filter and Strahlrichterbauteil 18 is inserted into a liquid-conducting tubular weld nipple 24 and secured at the end of this tubular weld nipple 24 by means of a union nut 26.
- the tubular welding nipple is connected at its, the mouthpiece 12 opposite end with a nozzle bar, not shown, in which the filter 20 protrudes.
- To be sprayed liquid is on the upstream and in Fig. 15 Nozzle bar, not shown, is fed to the tubular weld nipple 24 and also enters an annulus between the filter and jet director member 18 and an inner wall of the tubular weld nipple 24.
- the liquid enters the filter and jet funnel member 18 through the filter 20, to finally exit from the outlet opening of the mouthpiece 12 back into the environment.
- the largest free flow cross section is in the region of the filter 20 and is determined by the sum of the free cross sections of the elongate filter slots and the other filter slots in the filter cap.
- An already significantly reduced flow cross-section is present in the area of the jet director 22, the free flow cross-section there resulting from the cross-section of the total channel minus the end faces of the star-shaped flow guide surfaces.
- a ratio of the free flow cross-sectional area at the jet straightener 22 to the free flow cross-sectional area of the filter 20 is advantageously 1: 6 or greater.
- a further narrowing of the flow cross-section takes place after the jet straightener 22 on the cross section of the channel 27, which is guided with a constant cross section to the mouthpiece 12.
- a ratio of the free flow cross-sectional area in the channel 37 to the free flow cross-sectional area on the jet straightener 22 is advantageously 1: 1.23 or greater.
- a ratio of the free flow cross-sectional area in the channel 37 to the free flow cross-sectional area of the filter 20 is advantageously 1: 7.44 or greater.
- the free flow cross-sectional area in the channel 37 is, for example, 95 mm 2
- the free flow cross-sectional area in the jet funnel 22 is, for example, 117 mm 2
- the free flow cross-sectional area on the filter 20 is, for example, 707 mm 2 .
- a Metalllotnaht 28 is provided between an inner wall of the nozzle housing 14 and an annular end face of the mouthpiece 12, which seals the mouthpiece 12 against the nozzle housing 14.
- an outlet opening of the mouthpiece 12 spans a curved surface, especially a curved ellipse.
- the boundary 38 of the outlet opening 30 can span two different curved surfaces, namely once an outwardly curved ellipse in the outflow direction and an ellipse also curved inwards as seen in the outflow direction.
- the outlet opening 30 is surrounded by an end face 32, which in the illustration of Fig. 1 is divided by broken lines into four sectors 32a, 32b, 32c and 32d. In all sectors 32a, 32b, 32c and 32d, the surface 32 abuts in the radial direction perpendicular to a central longitudinal axis 34 on the boundary 38 of the outlet opening 30.
- the end face 32 has a wave-like shape and with respect to the central longitudinal axis and an outflow direction, the in the presentation of the Fig. 1 from right to left, the two sectors 32b and 32d are arranged in a first, upstream region and the two sectors 32a, 32c, in a second, downstream region.
- the two sectors lying in the second region 32a, 32c and the two opposite and lying in the first region sectors 32b, 32d are each formed symmetrically to each other, so that overall results in a symmetrical shape of the end face 32.
- Air sucked in by an outgoing liquid jet is supplied mainly via the two sectors 32b, 32d arranged in the upstream first region. Together with the symmetrical arrangement of these two upstream sectors 32b, 32d results in a temporally stable exit jet.
- the sectors 32a, 32b, 32c and 32d merge at their end facing away from the outlet opening 30 into a wave-shaped peripheral boundary edge, to which a cylindrical wall parallel to the outflow direction adjoins in sections.
- the wavy The circumferential boundary edge is formed geometrically in that, at each point of the boundary 38, a line perpendicular to the central longitudinal axis 34 is guided radially outwards and cut with a circular cylinder. The connection of these intersections on the shell of the circular cylinder then yields the wavy peripheral boundary edge and the end face 32 is determined by the radially outwardly guided lines.
- the shape of the end face 32 according to Fig. 1 arises by a bulging of a flat surface to the outside.
- the shape of the end face 32 can be clarified, for example, by providing a circular piece of paper with an elliptical passage opening. If one now places this circular paper on a flat surface and places one finger each on the areas in which the longer half-axis of the elliptical opening intersects the surrounding paper, one can now move the two fingers towards one another and become the ring formed by the paper with the exception of the sections on which the fingers rest, bulge upward from the flat support surface.
- the representation of the Fig. 2 the design of an outlet chamber 35 can be seen upstream of the outlet opening 30.
- the outlet chamber 35 has the shape of a circular cone tapering in the outflow direction. The intersection of this circular cone with a curved ellipse results in the shape of the boundary 38 of the outlet opening 30th
- a nose 36 on an outer wall of the mouthpiece 12 is intended to engage a mating recess in a nozzle housing and thereby ensure a correct rotational position of the mouthpiece 12 upon insertion of the mouthpiece 12 into a nozzle housing.
- FIG. 4 The view of Fig. 4 from behind also shows the elliptical shape of the outlet opening 30 and also reveals the circular cone shape of the outlet chamber 35.
- the sectional view of Fig. 5 shows a section parallel to the shorter half-axis of the elliptical outlet opening 30, as Fig. 3 can be seen. It is in Fig. 5 good to see that the, the outlet opening 30 surrounding surface 32 abuts at an angle of 90 ° to the central longitudinal axis 34 on the edge 38 of the outlet opening 30.
- the sectional view of Fig. 5 this is to be taken for two opposite points of the boundary 38, for two further opposite points this is the sectional view of Fig. 6 which shows the view on a sectional plane parallel to the larger semiaxis of the elliptical outlet opening 30, as Fig. 3 can be seen. Also in this section plane, the surface 32 surrounding the outlet opening 30 runs perpendicular to the central longitudinal axis 34 towards the outlet opening 30 and abuts the boundary 38 of the outlet opening 30 at an angle of 90 ° to the central longitudinal axis 34.
- the presentation of the Fig. 5a shows the detail 5a of Fig. 5 increased. It can be seen that the boundary 38 of the outlet opening 30 is formed by means of a chamfer.
- the chamfer is arranged at an angle to the central longitudinal axis 34 so that the angle enclosed by the central longitudinal axis and the chamfer opens in the outflow direction.
- the chamfer has only a very small height h of, for example, 0.1 mm to a maximum of 0.2 mm.
- the chamfer is provided primarily for production-technical reasons, in order to avoid a sharp edge which is highly sensitive especially when producing a hard metal mouthpiece 12. As already on the basis of Fig.
- the surface 32 has two opposing portions 32a, 32c, which are arranged in a first, upstream region, and two opposing portions 32b, 32d, which are arranged in a second, downstream of the first region region.
- a spray jet emerges from the outlet opening 30
- air is drawn in from the surroundings. which can flow along the sections 32b, 32d in the first region to the outlet opening 30.
- defined air flow conditions are created in the vicinity of the exiting jet, and a negative pressure caused by the exiting jet can not lead to a transient beam shaping.
- the mouthpiece 12 has in the region of the surface 32 a geometrically complicated shape, which can not be easily produced by mechanical processing.
- the mouthpiece 12 is therefore made by means of metal powder injection molding, so that the shaping in the region of the surface 32 can be easily realized.
- the mouthpiece 12 is thus formed as a sintered part and by means of metal powder injection molding of a raw material of hard metal powder and produced thermoplastic binder. After removal of the binder and subsequent sintering a hard metal component is thereby formed, which can withstand the high stresses during operation of the descaling according to the invention well.
- the representations of the Fig. 7 to 13 show the nozzle housing 14, in which the mouthpiece 12 is inserted.
- the nozzle housing 14 has an elliptical passage opening 40 which comes to lie in the assembled state of the nozzle downstream of the outlet opening 30.
- the passage opening 40 is delimited by a frusto-conically widening wall in the outflow direction. It should be noted again that the conically widening wall 42 is not used for fluid guidance.
- After leaving the outlet opening 30 of the spray jet 16 continues its path as a free jet, as well as on the basis of Fig. 15 can be seen.
- the passage opening 40 thus serves only to allow an air supply to the outlet opening 30 and to provide sufficient space for the passage of the spray jet 16.
- the longer semiaxis of the elliptical passage opening 40 is aligned parallel to the longer semiaxis of the elliptical exit opening 30.
- the nozzle housing 14 in the region of its inner bore has a recess 44 which is formed to match the projection 36 of the mouthpiece 12. After inserting the mouthpiece 12 into the nozzle housing 14, the mouthpiece 12 is thus aligned angularly exactly. Since only a recess 44 and a projection 36 are provided, there is only a relative position of mouthpiece 12 and nozzle housing 14, in which the mouthpiece 12 can be inserted into the nozzle housing 14.
- a metal solder seam 28 is applied as a fillet weld between the mouthpiece 12 and the nozzle housing 14 in order to seal the mouthpiece 12 against the nozzle housing 14.
- FIG. 16 perspective view of a mouthpiece 50 is shown according to a second embodiment.
- the mouthpiece 50 is identical to the mouthpiece 12, with the exception of the shape of an outlet opening 52 and the shape of an end face 54 surrounding the outlet opening Fig. 1 built up. Described below are therefore only the mouthpiece 12 of the Fig. 1 different characteristics.
- the outlet opening 52 has the shape of an outwardly curved in the outflow direction ellipse.
- a total of four sections 56a, 56b, 56c and 56d of the end face 56 adjoin the boundary 58 of the outlet opening.
- the two opposite sections 56a and 56c are formed as flat circular sections and the boundary 58 of the outlet opening 52 touches the sections 56a, 56c only tangentially at a point which lies in the middle of the straight edge of the circular section-shaped regions 56a, 56c. Between the two sections 56a, 56c, the two opposing sections 56b, 56d bulge outwards in the outflow direction.
- the sections 56b, 56d thus have approximately the shape of the lateral surface of an elliptical half-cylinder.
- the two sections 56b, 56d are arranged parallel to one another.
- the sections 56a, 56b, 56c and 56d of the end face 56 thus all run perpendicular to a central longitudinal axis 60 of the mouthpiece 50.
- the end face 56 thus abuts such an exit jet over the entire circumference of an exit jet perpendicular to the central longitudinal axis, thereby producing a clean, sharply delimited beam can be achieved even at very high water pressures. Nevertheless, a sufficient ventilation of the exiting jet is achieved via the sections 56a, 56c, so that no negative pressure can form laterally of the exiting jet, which could lead to instationary behavior.
Abstract
Description
Die Erfindung betrifft eine Sprühdüse, insbesondere eine Hochdruckdüse, zum Entzundern von Stahlerzeugnissen, mit einem Mundstück, wobei das Mundstück eine Austrittsöffnung und eine Austrittskammer, die sich verjüngend auf die Austrittsöffnung zuläuft, aufweist.The invention relates to a spray nozzle, in particular a high-pressure nozzle for descaling steel products, with a mouthpiece, wherein the mouthpiece has an outlet opening and an outlet chamber, which tapers to the outlet opening tapers.
Bekannte Hochdruckdüsen zum Entzundern von Stahlerzeugnissen sind als Flachstrahldüsen ausgebildet. Das Mundstück für solche Entzunderungsdüsen weist üblicherweise eine Austrittsöffnung auf, an die sich ein strahlformender Austrittskegel anschließt. Beispielsweise ist in dem europäischen Patent
Mit der Erfindung soll eine verbesserte Hochdruckdüse bereitgestellt werden.With the invention, an improved high-pressure nozzle is to be provided.
Erfindungsgemäß ist hierzu eine Hochdruckdüse, insbesondere zum Entzundern von Stahlerzeugnissen, mit einem Mundstück vorgesehen, wobei das Mundstück eine Austrittsöffnung und eine Austrittskammer, die sich verjüngend auf die Austrittsöffnung zuläuft, aufweist, bei der die Austrittsöffnung eine von der Austrittskammer aus gesehen gekrümmte Fläche, beispielsweise eine konvexe oder konkave Fläche, aufspannt und bei der eine die Berandung der Austrittsöffnung umgebende Fläche an jedem Punkt der Berandung in radialer Richtung in einen Winkel zwischen 65° und 95°, insbesondere 90°, zur Mittellängsachse auf die Berandung der Austrittsöffnung stößt.According to the invention, a high-pressure nozzle, in particular for descaling steel products, is provided with a mouthpiece, the mouthpiece having an outlet opening and an outlet chamber tapering towards the outlet opening, wherein the outlet opening has a curved surface, for example, viewed from the outlet chamber a convex or concave surface, spans and in which a surface surrounding the boundary of the outlet opening at each point of the boundary in the radial direction at an angle between 65 ° and 95 °, in particular 90 °, to the central longitudinal axis abuts the boundary of the outlet opening.
An die Austrittsöffnung des Mundstücks schließt sich somit kein Austrittskegel an, vielmehr enden die wasserführenden Abschnitte der Düse abrupt mit der Austrittsöffnung. Überraschenderweise hat sich gezeigt, dass durch eine solche Ausbildung des Mundstücks ein sauberer, scharf begrenzter Strahl auch bei sehr hohen Wasserdrücken erreicht werden kann. Durch Vorsehen einer Austrittsöffnung, die eine gekrümmte Fläche aufspannt, kann auch eine ausreichende Belüftung des austretenden Strahles erreicht werden, so dass sich nicht seitlich des Strahls ein Unterdruck ausbildet, der den Austrittsstrahl in negativer Weise beeinflusst oder gar zu instationärem Verhalten führt. Eine die Austrittsöffnung umgebende Stirnfläche des Mundstücks stößt an jedem Punkt der Berandung in einem Winkel zwischen 85° und 95°, insbesondere 90° zur Mittellängsachse auf die Berandung der Austrittsöffnung, wobei die Vorteile der Erfindung bis zu einem Winkel von etwa 65° genutzt werden können. An der Berandung der Austrittsöffnung verlässt der Wasserstrahl somit die Düse und stromabwärts der Austrittsöffnung sind keinerlei wasserführende Bauteile der Düse mehr vorgesehen. Indem an der Berandung der Austrittsöffnung die umgebende Fläche in einem Winkel von etwa 90° zur Mittellängsachse auf die Berandung stößt, wird eine scharfe Abrisskante für den austretenden Strahl geschaffen. Gleichzeitig kann eine sehr stabile Ausgestaltung der Mundstücks erreicht werden, die auch höchsten Drücken standhält. Da der Winkel, indem die umgebende Stirnfläche des Mundstücks auf die Berandung der Austrittsöffnung stößt, an jedem Punkt der Berandung annähernd rechtwinklig ist, werden um den gesamten Umfang des austretenden Strahles herum im Wesentlichen gleiche Verhältnisse an der Abreißkante geschaffen. Auch dies trägt zu einer sehr sauberen Ausbildung des gewünschten Flachstrahlkegels bei. Die die Berandung der Austrittsöffnung umgebende Fläche endet auf der, der Austrittsöffnung abgewandten Seite vorzugsweise an einem Kreis, der die Mittellängsachse konzentrisch umgibt. Auf diese Weise kann die unregelmäßig geformte Fläche, die die Austrittsöffnung umgibt, auf eine regelmäßige geometrische Form zurückgeführt werden.Thus, no outlet cone connects to the outlet opening of the mouthpiece, but the water-carrying sections of the nozzle end abruptly with the outlet opening. Surprisingly, it has been shown that such a design of the mouthpiece, a clean, sharply defined beam can be achieved even at very high water pressures. By providing an outlet opening, which spans a curved surface, it is also possible to achieve sufficient ventilation of the exiting jet, so that a negative pressure does not form laterally of the jet, which influences the exit jet in a negative way or even leads to instationary behavior. An end face of the mouthpiece surrounding the outlet opening abuts the boundary of the outlet opening at any angle between 85 ° and 95 °, in particular 90 ° to the central longitudinal axis, whereby the advantages of the invention can be utilized up to an angle of approximately 65 ° , At the boundary of the outlet opening of the water jet thus leaves the nozzle and downstream of the outlet opening no water-carrying components of the nozzle are no longer provided. By being at the Boundary of the outlet opening abuts the surrounding surface at an angle of about 90 ° to the central longitudinal axis of the boundary, a sharp spoiler for the outgoing beam is created. At the same time a very stable design of the mouthpiece can be achieved, which withstands even the highest pressures. Since the angle at which the surrounding end face of the mouthpiece abuts the boundary of the outlet opening is approximately rectangular at each point of the boundary, substantially equal conditions are created at the tear-off edge around the entire circumference of the exiting jet. This also contributes to a very clean design of the desired flat fan cone. The area surrounding the boundary of the outlet opening ends on the side facing away from the outlet opening, preferably on a circle concentrically surrounding the central longitudinal axis. In this way, the irregularly shaped surface surrounding the outlet opening can be returned to a regular geometric shape.
In Weiterbildung der Erfindung weist die die Berandung der Austrittsöffnung umgebende Fläche erste Abschnitte, die auf einer ersten Position oder in einem ersten Bereich entlang der Mittellängsachse angeordnet sind, und zweite Abschnitte auf, die auf einer zweiten Position angeordnet sind, wobei die zweite Position und der zweite Bereich von der ersten Position bzw. von dem ersten Bereich in Ausströmrichtung entlang der Mittellängsachse beabstandet sind.In a further development of the invention, the surface surrounding the boundary of the outlet opening has first sections which are arranged on a first position or in a first area along the central longitudinal axis, and second sections which are arranged on a second position, wherein the second position and the second region from the first position and from the first region in the outflow direction along the central longitudinal axis are spaced apart.
Auf diese Weise kann eine gute Belüftung und eine definierte Luftströmung in Richtung auf den aus der Austrittsöffnung austretenden Flüssigkeitsstrahl gewährleistet werden. Dadurch ergibt sich ein zeitlich konstantes Sprühbild, da im Betrieb der Düse um den austretenden Strahl herum definierte Strömungsverhältnisse in der zum austretenden Strahl hinströmenden Umgebungsluft geschaffen werden können. Über die ersten Abschnitte, die in Bezug auf die Ausströmrichtung stromaufwärts der zweiten Abschnitte liegen, kann durch den austretenden Strahl angesaugte Luft zugeleitet werden.In this way, good ventilation and a defined air flow in the direction of the liquid jet emerging from the outlet opening can be ensured. This results in a spray pattern that is constant in time since, during operation of the nozzle around the outgoing jet, defined flow conditions in the ambient air flowing toward the outgoing jet can be created. Over the first sections, upstream with respect to the outflow direction the second sections lie, can be supplied by the outgoing air sucked air.
In Weiterbildung der Erfindung ist die die Berandung der Austrittsöffnung umgebende Fläche in vier Abschnitte unterteilt, wobei zwei gegenüberliegende Abschnitte in dem ersten Bereich und zwei weitere gegenüberliegende Abschnitte in dem zweiten Bereich angeordnet sind.In a further development of the invention, the surface surrounding the boundary of the outlet opening is subdivided into four sections, wherein two opposing sections are arranged in the first section and two further opposite sections are arranged in the second section.
Durch diese Maßnahmen kann durch den austretenden Strahl angesaugte Luft symmetrisch über die im stromaufwärtsliegenden ersten Bereich angeordneten Abschnitte zugeleitet werden.As a result of these measures, air taken in by the outgoing jet can be supplied symmetrically over the sections arranged in the upstream first region.
In Weiterbildung der Erfindung ist die Berandung der Austrittsöffnung durch eine Verschneidung eines Kegels, insbesondere eines Kreiskegels, mit einer gekrümmten Ellipse definiert.In development of the invention, the boundary of the outlet opening is defined by an intersection of a cone, in particular a circular cone, with a curved ellipse.
Auch wenn die erfindungsgemäße Hochdruckdüse sich prinzipiell sogenannter Freiformflächen bedient, wobei also rechnerisch die Form der Berandung der Austrittsöffnung und der sich daran anschließenden Flächen definiert wird, so werden die erfindungsgemäßen Vorteile auch dann erreicht, wenn regelmäßige geometrische Formen, nämlich beispielsweise ein Kreiskegel mit einer gekrümmten Ellipse, geschnitten werden.Even if the high-pressure nozzle according to the invention uses so-called free-form surfaces in principle, ie the form of the boundary of the outlet opening and the adjoining surfaces is mathematically defined, the advantages according to the invention are also achieved if regular geometric shapes, namely, for example, a circular cone with a curved Ellipse, to be cut.
In Weiterbildung der Erfindung besteht das Mundstück aus Hartmetall.In a further development of the invention, the mouthpiece made of hard metal.
Gerade bei Entzunderungsdüsen ist das Mundstück hohen Belastungen ausgesetzt, insbesondere abrassiven Wirkungen der versprühten Flüssigkeit. Durch Verwenden von Hartmetallmundstücken kann hier die Standzeit der Düse erheblich verlängert werden.Especially with Entzunderungsdüsen the mouthpiece is exposed to high loads, especially abrassiven effects of the sprayed liquid. By using carbide tips, the service life of the nozzle can be extended considerably.
In Weiterbildung der Erfindung ist das Mundstück in einem Düsengehäuse gehalten, wobei das Düsengehäuse in Richtung der Mittellängsachse der Düse gesehen eine die Austrittsöffnung umgebende ovale Durchgangsöffnung aufweist.In a further development of the invention, the mouthpiece is held in a nozzle housing, wherein the nozzle housing seen in the direction of the central longitudinal axis of the nozzle has an outlet opening surrounding the oval passage opening.
Mittels einer solchen ovalen Durchgangsöffnung wird zu einer hochfesten Ausbildung des Düsengehäuses beigetragen. Wenn die erfindungsgemäße Hochdruckdüse als Flachstrahldüse ausgebildet ist, so ist eine ovale Durchgangsöffnung im Düsengehäuse der Querschnittsform des Flachstrahls besser angepasst als die üblicherweise verwendeten kreisrunden Durchgangsöffnungen. Abschnittsweise kann am Düsengehäuse daher mehr Material verbleiben als dies bei einer kreisrunden Durchgangsöffnung der Fall wäre, wodurch die Stabilität des Düsengehäuses erhöht wird. Als wesentlicher Punkt ist festzuhalten, dass die, die Austrittsöffnung umgebende ovale Durchgangsöffnung keinerlei Funktion in Bezug auf die Strahlbildung hat. Der aus der Austrittsöffnung austretende Sprühstrahl berührt das Düsengehäuse nicht. Stromabwärts der Austrittsöffnung sind keinerlei wasserführende Bauteile der Hochdruckdüse mehr vorgesehen und die Strahlformung erfolgt ausschließlich mittels des Mundstücks der Hochdruckdüse. Eine von der Durchgangsöffnung ausgehende und auf Höhe der Austrittsöffnung endende Umfangswandung des Düsengehäuses ist hierzu auf Höhe der Austrittsöffnung und senkrecht zur Mittellängsachse beabstandet von der Berandung der Austrittsöffnung angeordnet. Auf diese Weise kann sichergestellt werden, dass ein aus der Austrittsöffnung austretender Sprühstrahl die Umfangswandung nicht berührt. Das im Düsengehäuse gehaltene Mundstück kann gegen das Düsengehäuse mittels einer umlaufenden Metalllotnaht abgedichtet sein, die mittels Laserlöten angebracht wird.By means of such an oval passage opening is contributed to a high-strength design of the nozzle housing. If the high-pressure nozzle according to the invention is designed as a flat jet nozzle, then an oval through-opening in the nozzle housing is better adapted to the cross-sectional shape of the flat jet than the circular through-openings usually used. Thus, more material may be left in sections on the nozzle housing than would be the case with a circular passage opening, thereby increasing the stability of the nozzle housing. As an essential point, it should be noted that the oval passage opening surrounding the exit opening has no function with respect to the jet formation. The spray emerging from the outlet opening does not touch the nozzle housing. Downstream of the outlet opening, no water-carrying components of the high-pressure nozzle are provided any longer and the beam is formed exclusively by means of the mouthpiece of the high-pressure nozzle. An outgoing from the passage opening and ending at the height of the outlet opening peripheral wall of the nozzle housing is arranged at the level of the outlet opening and perpendicular to the central longitudinal axis spaced from the boundary of the outlet opening. In this way it can be ensured that a spray jet emerging from the outlet opening does not touch the circumferential wall. The mouthpiece held in the nozzle housing can be sealed against the nozzle housing by means of a circumferential metal solder seam which is attached by means of laser soldering.
In Weiterbildung der Erfindung sind das Mundstück und/oder das Düsengehäuse mittels Metallpulverspritzgießen hergestellt.In a further development of the invention, the mouthpiece and / or the nozzle housing are produced by means of metal powder injection molding.
Speziell beim Mundstück ist in dem, die Austrittsöffnung umgebenden Bereich eine geometrisch komplizierte Formgebung des Mundstücks erforderlich, die sich nicht oder lediglich mit erheblichem Aufwand mittels mechanischer Bearbeitung herstellen lässt. Durch Metallpulverspritzgießen können im Wesentlichen beliebige Formen hergestellt und speziell kann die Formgebung der erfindungsgemäßen Hochdruckdüse in dem, die Austrittsöffnung umgebenden Bereich, auch bei einer Serienfertigung erreicht werden. Auch bei Herstellung des Mundstücks aus Hartmetall oder einer Hartmetalllegierung kann dieses durch Metallpulverspritzgießen hergestellt werden. Beim Metallpulverspritzgießen wird zunächst Metallpulver mit einem thermoplastischen Kunststoffbinder vermischt. Diese Mischung wird dann mittels Spritzguss in eine Form gebracht. In einem anschließenden Verfahrensschritt wird der thermoplastische Binder chemisch oder thermisch entfernt. Es bleibt ein Zwischenbauteil zurück, das aus einer Metallpulverstruktur besteht. Dieses Zwischenteil wird nachfolgend gesintert und erhält dadurch eine hohe Materialfestigkeit.Especially in the case of the mouthpiece, a geometrically complicated shape of the mouthpiece is required in the area surrounding the outlet opening, which can not be produced by mechanical processing or only with considerable effort. By metal powder injection molding essentially any shapes can be produced and in particular the shaping of the high-pressure nozzle according to the invention can be achieved in the area surrounding the outlet opening, even in mass production. Even when producing the mouthpiece made of hard metal or a hard metal alloy, this can be produced by metal powder injection molding. In metal powder injection molding, metal powder is first mixed with a thermoplastic binder. This mixture is then brought into a mold by injection molding. In a subsequent process step, the thermoplastic binder is removed chemically or thermally. There remains an intermediate component, which consists of a metal powder structure. This intermediate part is subsequently sintered, thereby obtaining a high material strength.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Ansprüchen und der nachfolgenden Beschreibung einer bevorzugten Ausführungsform im Zusammenhang mit den Zeichnungen. In den Zeichnungen zeigen:
- Fig. 1
- eine perspektivische Darstellung eines Mundstücks einer erfindungsgemäßen Hochdruckdüse von schräg vorne,
- Fig. 2
- eine perspektivische Darstellung des Mundstücks der
Fig. 1 von schräg hinten, - Fig. 3
- eine Vorderansicht des Mundstücks der
Fig. 1 , - Fig. 4
- eine Ansicht des Mundstücks der
Fig. 1 von hinten, - Fig. 5
- eine Schnittansicht auf die Ebene V-V der
Fig. 3 , - Fig. 5a
- eine vergrößerte Darstellung der
Einzelheit 5a derFig. 5 ; - Fig. 6
- eine Schnittansicht auf die Ebene VI-VI der
Fig. 3 , - Fig. 7
- eine Ansicht eines Düsengehäuses der erfindungsgemäßen Hochdruckdüse von vorne,
- Fig. 8
- das Düsengehäuse der
Fig. 7 in einer Seitenansicht, - Fig. 9
- eine Schnittansicht auf die Ebene IX-IX der
Fig. 8 , - Fig. 10
- eine Ansicht des Düsengehäuses der
Fig. 7 von hinten. - Fig. 11
- eine Schnittansicht auf die Ebene XI-XI der
Fig. 10 , - Fig. 12
- eine Schnittansicht auf die Ebene XII-XII der
Fig. 11 , - Fig. 13
- eine perspektivische Ansicht des Düsengehäuses der
Fig. 7 , - Fig. 14
- eine perspektivische, aufgeschnittene Ansicht einer erfindungsgemäßen Hochdruckdüse,
- Fig. 15
- eine Schnittansicht der Hochdruckdüse der
Fig. 14 , - Fig. 16
- eine perspektivische Darstellung eines Mundstücks einer erfindungsgemäßen Hochdruckdüse von schräg vorne gemäß einer zweiten Ausführungsform,
- Fig. 17
- eine Schnittansicht des Mundstücks der
Fig. 16 und - Fig. 18
- eine weitere Schnittansicht des Mundstücks der
Fig. 16 , wobei die Schnittebene gegenüber derFig. 17 um 90° gedreht ist.
- Fig. 1
- a perspective view of a mouthpiece of a high-pressure nozzle according to the invention obliquely from the front,
- Fig. 2
- a perspective view of the mouthpiece of
Fig. 1 from diagonally behind, - Fig. 3
- a front view of the mouthpiece of
Fig. 1 . - Fig. 4
- a view of the mouthpiece of the
Fig. 1 from behind, - Fig. 5
- a sectional view on the plane VV of
Fig. 3 . - Fig. 5a
- an enlarged view of the
detail 5a ofFig. 5 ; - Fig. 6
- a sectional view on the level VI-VI of
Fig. 3 . - Fig. 7
- a view of a nozzle housing of the high-pressure nozzle according to the invention from the front,
- Fig. 8
- the nozzle housing the
Fig. 7 in a side view, - Fig. 9
- a sectional view on the level IX-IX of
Fig. 8 . - Fig. 10
- a view of the nozzle housing the
Fig. 7 from behind. - Fig. 11
- a sectional view on the plane XI-XI the
Fig. 10 . - Fig. 12
- a sectional view on the plane XII-XII of
Fig. 11 . - Fig. 13
- a perspective view of the nozzle housing the
Fig. 7 . - Fig. 14
- a perspective, cutaway view of a high-pressure nozzle according to the invention,
- Fig. 15
- a sectional view of the high pressure nozzle of
Fig. 14 . - Fig. 16
- a perspective view of a mouthpiece of a high-pressure nozzle according to the invention obliquely from the front according to a second embodiment,
- Fig. 17
- a sectional view of the mouthpiece of
Fig. 16 and - Fig. 18
- another sectional view of the mouthpiece of
Fig. 16 , wherein the sectional plane opposite to theFig. 17 rotated by 90 °.
Die in den
Das Düsengehäuse 14 mit dem Mundstück 12 und dem kombinierten Filter- und Strahlrichterbauteil 18 ist in einen flüssigkeitsführenden rohrförmigen Anschweißnippel 24 eingesteckt und am Ende dieses rohrförmigen Anschweißnippels 24 mittels einer Überwurfmutter 26 befestigt. Der rohrförmige Anschweißnippel ist an seinem, dem Mundstück 12 gegenüberliegenden Ende mit einem nicht dargestellten Düsenbalken verbunden, in den der Filter 20 vorragt. Zu versprühende Flüssigkeit wird über den stromaufwärtsgelegenen und in
Der größte freie Strömungsquerschnitt liegt im Bereich des Filters 20 vor und wird durch die Summe der freien Querschnitte der länglichen Filterschlitze sowie der weiteren Filterschlitze in der Filterkappe bestimmt. Ein bereits deutlich verringerter Strömungsquerschnitt liegt im Bereich des Strahlrichters 22 vor, wobei sich der freie Strömungsquerschnitt dort aus dem Querschnitt des Gesamtkanals abzüglich der Stirnflächen der sternförmig angeordneten Strömungsleitflächen ergibt. Ein Verhältnis der freien Strömungsquerschnittsfläche am Strahlrichter 22 zu der freien Strömungsquerschnittsfläche des Filters 20 liegt vorteilhafterweise bei 1:6 oder größer.The largest free flow cross section is in the region of the
Eine weitere Einengung des Strömungsquerschnitts erfolgt nach dem Strahlrichter 22 auf den Querschnitt des Kanals 27, der mit konstantem Querschnitt bis vor das Mundstück 12 geführt ist. Ein Verhältnis der freien Strömungsquerschnittsfläche im Kanal 37 zur freien Strömungsquerschnittsfläche am Strahlrichter 22 liegt vorteilhafterweise bei 1:1,23 oder größer.A further narrowing of the flow cross-section takes place after the
Ein Verhältnis der freien Strömungsquerschnittsfläche im Kanal 37 zur freien Strömungsquerschnittsfläche des Filters 20 liegt vorteilhafterweise bei 1:7,44 oder größer.A ratio of the free flow cross-sectional area in the channel 37 to the free flow cross-sectional area of the
Die freie Strömungsquerschnittsfläche im Kanal 37 beträgt beispielsweise 95 mm2, die freie Strömungsquerschnittsfläche im Strahlrichter 22 beträgt beispielsweise 117 mm2 und die freie Strömungsquerschnittsfläche am Filter 20 beträgt beispielsweise 707 mm2.The free flow cross-sectional area in the channel 37 is, for example, 95 mm 2 , the free flow cross-sectional area in the
Am stromaufwärtsgelegenen Ende des Mundstücks 12 ist zwischen einer Innenwand des Düsengehäuses 14 und einer ringförmigen Stirnfläche des Mundstücks 12 eine Metalllotnaht 28 vorgesehen, die das Mundstück 12 gegen das Düsengehäuse 14 abdichtet.At the upstream end of the
Anhand der perspektivischen Darstellung des Mundstücks 12 in der
Die Austrittsöffnung 30 ist von einer Stirnfläche 32 umgeben, die in der Darstellung der
Die Form der Stirnfläche 32 gemäß
Der Darstellung der
In der Vorderansicht der
Eine Nase 36 an einer Außenwand des Mundstücks 12 ist dafür vorgesehen, in eine passende Ausnehmung in einem Düsengehäuse einzugreifen und dadurch beim Einsetzen des Mundstücks 12 in ein Düsengehäuse eine korrekte Drehposition des Mundstücks 12 sicherzustellen.A
Die Ansicht der
Die Schnittansicht der
Dies ist für beliebige Schnittebenen der Fall, da die die Berandung 38 der Austrittsöffnung 30 umgebende Fläche 32 an jedem Punkt der Berandung 38 in radialer Richtung in einem Winkel von 90° zur Mittellängsachse 34 auf die Berandung 38 der Austrittsöffnung 30 stößt. Mit dem Verlassen der Austrittsöffnung 30 ist der austretende Sprühstrahl damit frei und wird nicht mehr durch irgendwelche Leitflächen der Düse geführt. Die wasserführenden Bauteile der Düse endet somit an der Abrisskante, die durch die Berandung 38 der Austrittsöffnung 30 und die sich an die Berandung 38 anschließende Fläche 32 ergibt.This is the case for arbitrary cutting planes, since the
Die Darstellung der
Das Mundstück 12 weist im Bereich der Fläche 32 eine geometrisch komplizierte Formgebung auf, die nicht ohne weiteres durch mechanische Bearbeitung hergestellt werden kann. Das Mundstück 12 ist daher mittels Metallpulverspritzgießen hergestellt, so dass die Formgebung im Bereich der Fläche 32 problemlos realisiert werden kann. Das Mundstück 12 ist somit als Sinterteil ausgebildet und mittels Metallpulverspritzgießen aus einem Ausgangsmaterial aus Hartmetallpulver und thermoplastischen Binder hergestellt. Nach dem Entfernen des Binders und nachfolgendem Sintern ist dadurch ein Hartmetallbauteil gebildet, das den hohen Beanspruchungen im Betrieb der erfindungsgemäßen Entzunderungsdüse gut standhalten kann.The
Die Darstellungen der
Die längere Halbachse der elliptischen Durchgangsöffnung 40 ist parallel zur längeren Halbachse der elliptischen Austrittsöffnung 30 ausgerichtet. Dadurch wird genügend Raum für den Austritt eines Flachstrahls aus der Austrittsöffnung 30 geschaffen und gleichzeitig wird das Düsengehäuse 14 so wenig wie möglich geschwächt. Dies deshalb, da gegenüber einer kreisförmigen Durchgangsöffnung mehr Material am Düsengehäuse 14 stehen bleiben kann und dieses dadurch geringere Materialspannungen ertragen muss. Über das Düsengehäuse 14 werden die Schubkräfte aufgenommen und in den rohrförmigen Anschweißnippel 24 eingeleitet, die aus dem Flüssigkeitsdruck in Strömungsrichtung auf das Mundstück 12 resultieren. Da erfindungsgemäße Hochdruckentzunderungsdüsen bei Drücken von mehreren 100 bar und bis zu 600 bar betrieben werden, können hier erhebliche Kräfte auftreten.The longer semiaxis of the
Anhand der Ansichten der
Nach dem vollständigen Einschieben des Mundstücks 12 in das Düsengehäuse 14 liegt ein umlaufender, nach außen vorspringender Absatz 46 des Mundstücks 12 auf einer nach innen vorspringenden Schulter 48 des Düsengehäuses 14 auf und wird dadurch parallel zur Mittellängsachse 37 in Position gehalten. In dieser Position wird dann, wie bereits erläutert wurde, eine Metalllotnaht 28 als Kehlnaht zwischen Mundstück 12 und Düsengehäuse 14 aufgebracht, um das Mundstück 12 gegen das Düsengehäuse 14 abzudichten.After complete insertion of the
In der Darstellung der
Die Austrittsöffnung 52 weist die Form einer nach außen, in Ausströmrichtung gewölbten Ellipse auf. An die Berandung 58 der Austrittsöffnung schließen sich insgesamt vier Abschnitte 56a, 56b, 56c und 56d der Stirnfläche 56 an. Die beiden gegenüberliegenden Abschnitte 56a und 56c sind dabei als ebene Kreisabschnitte ausgebildet und die Berandung 58 der Austrittsöffnung 52 berührt die Abschnitte 56a, 56c jeweils nur tangential in einem Punkt, der in der Mitte der geraden Kante der kreisabschnittsförmigen Bereiche 56a, 56c liegt. Zwischen den beiden Abschnitten 56a, 56c wölben sich die beiden gegenüberliegenden Abschnitte 56b, 56d in Ausströmrichtung nach außen. Die Abschnitte 56b, 56d weisen somit etwa die Form der Mantelfläche eines elliptischen Halbzylinders auf. Die beiden Abschnitte 56b, 56d sind dabei parallel zueinander angeordnet. Die Abschnitte 56a, 56b, 56c und 56d der Stirnfläche 56 verlaufen somit alle senkrecht zu einer Mittellängsachse 60 des Mundstücks 50. Die Stirnfläche 56 stößt damit über den gesamten Umfang eines Austrittsstrahles senkrecht zur Mittellängsachse auf einen solchen Austrittsstrahl, wodurch ein sauberer, scharf begrenzter Strahl auch bei sehr hohem Wasserdrücken erreicht werden kann. Dennoch wird über die Abschnitte 56a, 56c eine ausreichende Belüftung des austretenden Strahles erreicht, so dass sich seitlich des austretenden Strahles kein Unterdruck ausbilden kann, der zu instationärem Verhalten führen könnte.The
Claims (10)
- Spray nozzle, in particular a high-pressure nozzle, for descaling steel products, with a mouthpiece (12), wherein the mouthpiece (12) incorporates an outlet opening (30) and an outlet chamber (35) which narrows towards the outlet opening (30), characterised in that the outlet opening (30) extends over a curved surface, and that a surface (32) that surrounds the boundary (38) of the outlet opening (30) meets the boundary (38) of the outlet opening (30) at every point of the boundary (38) making an angle between 65° and 95°, in particular 90°, with the central longitudinal axis (34).
- Spray nozzle according to Claim 1, characterised in that the surface (32) that surrounds the outlet opening (30) meets the boundary of the outlet opening (30) at every point of the boundary (38) radially making an angle of between 65° and 95°, in particular of 90°, with the central longitudinal axis (34).
- Spray nozzle according to Claim 1 or 2, characterised in that the boundary (38) of the outlet opening (30) is formed, at least in sections, by means of a chamfer (3 1).
- Spray nozzle according to one of the foregoing claims, characterised in that the surface (32) that surrounds the boundary (38) of the outlet opening (30) has first sections (32b, 32d; 56a, 56c) which are located along the central longitudinal axis (34) in a first region, and second sections (32a, 32c; 56b, 56d) which are located in a second region that is at a distance from the first region along the central longitudinal axis (34) in streaming direction.
- Spray nozzle according to Claim 4, characterised in that the surface (32) that surrounds the boundary (38) of the outlet opening (30) is divided into four sections (32a, 32b, 32c, 32d; 56a, 56b, 56c, 56d), whereby two first sections (32b, 32d; 56a, 56c) are positioned opposite one another in the first region and two further sections (32a, 32c; 56b, 56d) are positioned opposite one another in the second region.
- Spray nozzle according to at least one of the foregoing claims, characterised in that the boundary (38) of the outlet opening (30) is defined by the intersection of a cone, in particular a circular cone, with a curved ellipse or a curved oval.
- Spray nozzle according to at least one of the foregoing claims, characterised in that the mouthpiece (12) is manufactured of carbide.
- Spray nozzle according to at least one of the foregoing claims, characterised in that the mouthpiece (12) is held in a nozzle housing (14), whereby the nozzle housing (14), when viewed along the direction of the central longitudinal axis (34) of the nozzle, has an oval or elliptical aperture (40) surrounding the outlet opening.
- Spray nozzle according to Claim 8, characterised in that a surrounding wall (42) of the nozzle housing (14) that starts from the aperture (40) and ends at the level of the outlet opening (30) is located at the level of the outlet opening (30) perpendicularly to the central longitudinal axis (34) at a distance from the boundary (38) of the outlet opening (30), so that a spray jet (16) emerging from the outlet opening (30) does not touch the surrounding wall (42).
- Spray nozzle according to at least one of Claims 8 or 9, characterised in that the mouthpiece (12) and/or the nozzle housing (14) is manufactured by metal powder injection moulding.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007024245A DE102007024245B3 (en) | 2007-05-15 | 2007-05-15 | Spray nozzle i.e. high pressure nozzle for descaling steel products, has outlet clamping curved surface, and another surface abutting against boundary of outlet in radial direction at specific angle to central longitudinal axis |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1992414A2 EP1992414A2 (en) | 2008-11-19 |
EP1992414A3 EP1992414A3 (en) | 2009-12-16 |
EP1992414B1 true EP1992414B1 (en) | 2011-11-30 |
Family
ID=39646334
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08007838A Not-in-force EP1992414B1 (en) | 2007-05-15 | 2008-04-23 | Spray nozzle |
Country Status (9)
Country | Link |
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US (1) | US8079534B2 (en) |
EP (1) | EP1992414B1 (en) |
JP (1) | JP5426111B2 (en) |
KR (1) | KR101384295B1 (en) |
CN (1) | CN101306410B (en) |
AT (1) | ATE535308T1 (en) |
DE (1) | DE102007024245B3 (en) |
ES (1) | ES2375173T3 (en) |
RU (1) | RU2469797C2 (en) |
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JP2008284549A (en) * | 2007-05-15 | 2008-11-27 | Lechler Gmbh | Spray nozzle |
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-
2007
- 2007-05-15 DE DE102007024245A patent/DE102007024245B3/en not_active Expired - Fee Related
-
2008
- 2008-04-23 EP EP08007838A patent/EP1992414B1/en not_active Not-in-force
- 2008-04-23 AT AT08007838T patent/ATE535308T1/en active
- 2008-04-23 ES ES08007838T patent/ES2375173T3/en active Active
- 2008-05-07 RU RU2008117854/02A patent/RU2469797C2/en not_active IP Right Cessation
- 2008-05-14 US US12/152,453 patent/US8079534B2/en not_active Expired - Fee Related
- 2008-05-14 KR KR1020080044753A patent/KR101384295B1/en active IP Right Grant
- 2008-05-15 CN CN2008100995620A patent/CN101306410B/en not_active Expired - Fee Related
- 2008-05-15 JP JP2008128717A patent/JP5426111B2/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008284549A (en) * | 2007-05-15 | 2008-11-27 | Lechler Gmbh | Spray nozzle |
Also Published As
Publication number | Publication date |
---|---|
ES2375173T3 (en) | 2012-02-27 |
KR20080101712A (en) | 2008-11-21 |
DE102007024245B3 (en) | 2008-08-28 |
US20080290197A1 (en) | 2008-11-27 |
CN101306410B (en) | 2012-10-10 |
RU2469797C2 (en) | 2012-12-20 |
CN101306410A (en) | 2008-11-19 |
ATE535308T1 (en) | 2011-12-15 |
US8079534B2 (en) | 2011-12-20 |
EP1992414A2 (en) | 2008-11-19 |
RU2008117854A (en) | 2009-11-20 |
KR101384295B1 (en) | 2014-04-10 |
JP5426111B2 (en) | 2014-02-26 |
EP1992414A3 (en) | 2009-12-16 |
JP2008284549A (en) | 2008-11-27 |
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