EP0730498B1 - Düse zur oberflächenbehandlung sowie vorrichtung und verfahren zur oberflächenbehandlung mit einer solchen düse - Google Patents

Düse zur oberflächenbehandlung sowie vorrichtung und verfahren zur oberflächenbehandlung mit einer solchen düse Download PDF

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Publication number
EP0730498B1
EP0730498B1 EP95902800A EP95902800A EP0730498B1 EP 0730498 B1 EP0730498 B1 EP 0730498B1 EP 95902800 A EP95902800 A EP 95902800A EP 95902800 A EP95902800 A EP 95902800A EP 0730498 B1 EP0730498 B1 EP 0730498B1
Authority
EP
European Patent Office
Prior art keywords
section
nozzle
cross
surface treatment
solid particles
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.)
Expired - Lifetime
Application number
EP95902800A
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English (en)
French (fr)
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EP0730498A1 (de
Inventor
Thierry Mollard
Philippe Cotella
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.)
CAE Electronics Ltd
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CAE Electronics Ltd
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Filing date
Publication date
Application filed by CAE Electronics Ltd filed Critical CAE Electronics Ltd
Publication of EP0730498A1 publication Critical patent/EP0730498A1/de
Application granted granted Critical
Publication of EP0730498B1 publication Critical patent/EP0730498B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1481—Spray pistols or apparatus for discharging particulate material
    • B05B7/1486—Spray pistols or apparatus for discharging particulate material for spraying particulate material in dry state

Definitions

  • the present invention relates to a treatment nozzle surface, as well as a method and a device surface treatment using such a nozzle, for example to strip one or more layers of paint or other coating arranged on a surface, in particular a exterior surface of an airplane.
  • the present invention relates to a surface treatment nozzle intended to project solid particles entrained in a gas flow under pressure, this nozzle having a single inlet for receive the solid particles mixed with the gas flow under pressure and a single outlet to project the solid particles, the outlet having a slit shape elongated which has a longitudinal axis and extends along this longitudinal axis between two ends, the nozzle comprising a channel having, in the direction of flow of solid particles, first a convergent section which communicates with the nozzle entrance, then a section divergent which opens to the outside of the nozzle through the slot outlet and which has a section over its entire length of flattened shape parallel to said outlet slot, the divergent section also having two side edges which extend along said section each diverge to one end of the outlet slot.
  • a nozzle of this type is disclosed in the document GB-A-2 191 127.
  • This known nozzle has the disadvantage, however that the effectiveness of surface treatment is not equally distributed over the entire width of the nozzle, this efficiency being very high in the center of the nozzle and low on the sides of the nozzle spray.
  • the nozzle disclosed in the aforementioned document has a section discontinuity which can induce rapid wear of the nozzle and which generates turbulence further disrupting the effectiveness of pickling, especially when the nozzle is used with speeds of important gases, and in particular supersonic velocities in the divergent section.
  • the object of the present invention is in particular to avoid these disadvantages.
  • a treatment nozzle surface of the type mentioned above is basically characterized in that the channel has variations of progressive section over its entire length, in that the converging section has a downstream end which has a flattened section parallel to the slot outlet, and in that the diverging section has, at least towards the exit slot, two lateral sections widened respectively in the vicinity of the two lateral edges, these two side parts of enlarged section being separated by at least part of a narrower section.
  • the surface treatment nozzle according to the invention when the surface treatment nozzle according to the invention is moved over a surface, by example perpendicular to its exit slot, in projecting solid particles onto this surface, nozzle leaves behind a treated trace of which all dots have received particles which exhibit substantially the same kinetic energy and have been exposed for a time substantially identical to said particles.
  • the surface treatment is of the same quality over the entire width of the processed trace.
  • the surface treatment nozzle according to the invention it is in particular possible to strip a layer paint that covers an underlying surface made up by a base layer, a composite material or another material without in any way damaging said underlying surface.
  • the present invention also relates to a surface treatment device comprising a nozzle as defined above and supply means to send solid particles to the nozzle entrance mixed with the pressurized gas flow, with a flow sufficient for the gas flow to be supersonic in the divergent section.
  • the present invention also relates to a surface treatment device comprising a nozzle as defined above and positioning means to move the nozzle essentially in translation the along an area to be treated.
  • This process applies in particular to the pickling of surfaces.
  • the projected particles can be starch-based or plastic-based particles.
  • the surface treatment method according to the invention is particularly suitable for stripping a surface very precise or sensitive to attack, for example example an exterior surface of an airplane.
  • the surface treatment nozzle of Figures 1 to 3 has a central channel which extends longitudinally between an inlet 3 and an outlet 4.
  • the inlet orifice 3 of the channel comprises a housing 3 1 which is adapted to receive one end of a supply duct which brings to the channel of the nozzle a flow of pressurized gas transporting solid particles with possibly liquid droplets.
  • This housing 3 1 is not strictly speaking part of the central channel of the nozzle, since it is not in contact with the flow of gas under pressure or with the solid particles transported by this flow of gas.
  • the central channel of the nozzle comprises, in the direction of flow of the solid particles, first a convergent section 6, then a divergent section 7.
  • the nozzle inlet 3 has a cross section circular, and the converging section 6 has a section which varies continuously between a circular section at its upstream end, and a flattened section, in particular elliptical, at its downstream end, i.e. at the level of the neck 5 which separates the converging section 6 from the section divergent 7.
  • the converging section 6 flattens gradually between its upstream end and its end downstream.
  • outlet orifice 4 of the nozzle is an elongated slot
  • divergent section 7 has itself a flattened section parallel to the exit slot 4.
  • the divergent section 7 has, in the vicinity of col 5, an elliptical section which corresponds exactly at the section of the downstream end of the section converge 6.
  • This elliptical section gradually deforms towards the exit slot 4 by widening slightly in the direction of the longitudinal axis 12 of the exit slot, up to a width l given at the exit slot, and increasing thick in the vicinity of the lateral edges 7 1 of the divergent section 7, until forming enlarged lateral parts 4 1 of thickness e at the ends of the outlet slot 4.
  • the ratio l / e can for example be greater than 2.
  • the divergent section 7 could possibly also include a progressive widening in its center, until it also forms an enlarged part 4 2 at the center of the outlet slot 4, this enlarged central part being separated from the lateral parts widened 4 1 by parts of narrower section.
  • the neck 5 between the converging section 6 and the section divergent 7 is formed by the line of intersection between the interior surfaces of said converging sections and divergent, so that the central channel of the nozzle does not has no section discontinuity, i.e. no surface forming an abrupt obstacle to the flow of compressed gas or sudden enlargement.
  • the channel of the nozzle preferably has a non-angular section, even at the side edges 7 1 of the converging section 7, where the section of the channel has a small radius of curvature.
  • the surface treatment nozzle of the invention can be produced in various ways.
  • this nozzle is produced by molding two parts 1 1 and 1 2 , from a metallic material of very hardness, these two parts being assembled according to a joint plane 1 3 parallel to the axis longitudinal 12 of the outlet slot 4, by means of screws 2.
  • nozzle 1 To treat a surface 8, for example to strip an outer surface of an airplane, we have nozzle 1 above of the surface 8, so that the longitudinal axis 12 of the outlet slot 4 of the nozzle is arranged parallel to said surface 8. At the same time that we project solid particles on the surface 8 to strip it, i.e. for example to remove paint that covers said surface 8, the nozzle 1 is displaced essentially by translation in a direction 9 (in one direction or in the other of this direction) parallel to the surface 8 and in general, but not exclusively, perpendicular to the axis longitudinal 12 of the outlet slot 4.
  • the movement of the nozzle 1 can possibly have oscillations parallel to the surface 8 and perpendicular to direction 9, but nozzle 1 is then always moves in translation, that is to say with its axis 12 always in the same direction.
  • the nozzle In addition to its translational movement, it goes from so that the nozzle can be moved from time to time causing a rotation of its axis 12, especially during repositioning maneuvers.
  • the displacement of the treatment nozzle of surface 1 produces a pickled trace 10 which is suitably treated over its entire width, without any aggression of the underlying material from surface 8 to the center of the trace 10.
  • the projected particles may in particular be particles based on matter plastic or starch-based particles, for example wheat starch particles.
  • the surface treatment nozzle 1 according to the invention can in particular be used in the treatment device surface 20 shown in FIG. 5.
  • This device comprises a working head 21 forming an enclosure which is open towards the surface to treat 8, the outlet of the nozzle 1 opening inside of this enclosure.
  • the working head 21 is kept applied to the surface 8, or near surface 8, and it is also moved along surface 8 by a system of positioning 22 which can be of any known type.
  • the positioning system 22 has a guide beam 23 which can be fixed during the operation of the nozzle 1, a carriage 24 movable along the guide beam 23, one arm articulated robotic 25 which is fixed to the carriage 24, and compressed air cylinders 26 which hold the working head 21 against surface 8.
  • the guide beam 23 can be mounted at the end of an articulated boom carried by a vehicle (not shown).
  • the inlet 3 of the nozzle 1 is supplied with compressed gas, especially in compressed air, loaded with solid particles, by a supply conduit 30 which is connected on the one hand to a compressor 31, and on the other hand to a feed hopper 32 containing a reserve of solid particles.
  • the working head 21 is also connected to a suction duct 33 to collect the solid particles after their projection, this conduit suction 33 being connected to a suction turbine 34 via a collection hopper 35 which receives the solid particles sucked up.
  • Solid particles collected in the hopper 35 can be recycled to the feed hopper 32, in which case they preferably pass through a system of separation 36 which can for example separate by sieving the particles too large or too small, by centrifugation excessively heavy particles, possibly by magnetization metallic particles, to send these particles separated in waste at 37.
  • the separation system 36 can in addition to receiving new solid particles from a reserve 38.
  • the compressor 31 feeds the nozzle 1 with sufficient gas flow for the gas flow in nozzle 1 becomes sonic at the neck 5 then supersonic in the divergent section 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Coating With Molten Metal (AREA)

Claims (11)

  1. Düse zur Oberflächenbehandlung, mit der in einem Druckgasstrom mitgeführte Feststoffteilchen ausgetrieben werden können, wobei diese Düse versehen ist mit einem einzelnen Einlaß (3) zum Aufnehmen der in dem Druckgasstrom vermischten Feststoffteilchen und mit einem einzelnen Auslaß (4) zum Austreiben der Feststoffteilchen, wobei der Auslaß (4) die Form eines länglichen Schlitzes hat, der eine Längsachse (12) aufweist und sich in Übereinstimmung mit dieser Längsachse zwischen zwei Enden erstreckt, wobei die Düse einen Kanal (6, 7) umfaßt, der in Strömungsrichtung der Feststoffteilchen zunächst aufweist ein konvergierendes Teilstuck (6), das mit dem Einlaß (3) der Düse kommuniziert, und danach ein divergierendes Teilstück (7), das an dem Ende der Düse als Auslaßschlitz (4) mündet, und das über seine ganze Länge einen Querschnitt mit einer parallel zu dem Auslaßschlitz abgeflachten Form aufweist, wobei das divergierende Teilstück ferner zwei Seiterränder (71) aufweist, die sich jeweils bis zu einem Ende des Auslaßschlitzes entlang des divergierenden Teilstücks erstrecken,
    dadurch gekennzeichnet, daß der Kanal (6, 7) Veränderungen im Querschnitt aufweist, die sich über seine ganze Länge fortsetzen, daß das konvergierende Teilstück (6) ein stromabwärts liegendes Ende (5) umfaßt, das einen parallel zum Auslaßschlitz (4) abgeflachten Querschnitt aufweist, und daß das divergierende Teilstück (7) wenigstens zu seinem Auslaßschlitz (4) hin jeweils in der Nähe der beiden Seitenränder (71) zwei seitliche Bereiche mit erweitertem Querschnitt (41) aufweist, wobei diese zwei seitlichen Bereiche mit erweitertem Querschnitt durch wenigstens einen Bereich mit engerem Querschnitt getrennt sind.
  2. Düse nach Anspruch 1, in welcher das konvergierende Teilstück ein stromaufwärts liegendes Ende umfaßt, das einen kreisförmigen Querschnitt aufweist.
  3. Düse nach einem der Ansprüche 1 und 2, in welcher das divergierende Teilstück (7) die zwei seitlichen Bereiche mit erweitertem Abschnitt (41) über im wesentlichen seine ganze Länge aufweist.
  4. Düse nach einem der Ansprüche 1 bis 3, in welcher das divergierende Teilstück (7) ferner wenigstens in der Nähe seines Auslaßschlitzes (4) einen Zentralbereich mit erweitertem Querschnitt (42) aufweist, der von jedem seitlichen Bereich mit erweitertem Querschnitt (41) durch einen Bereich mit engerem Querschnitt getrennt ist.
  5. Vorrichtung zur Oberflächenbehandlung mit einer Düse zur Oberflächenbehandlung gemäß einem der vorstehenden Ansprüche und mit Versorgungsmitteln zum Zuführen der im Druckgasstrom vermischten Feststoffteilchen an den Einlaß (3) der Düse mit einer Leistung, die ausreicht, daß der Gasstrom in dem divergierenden Teilstück (7) Überschall hat.
  6. Vorrichtung zur Behandlung einer Oberfläche, mit einer Düse zur Oberflächenbehandlung gemäß einem der Ansprüche 1 bis 4 und mit einer Positioniereinrichtung (22) zum Verschieben der Düse im wesentlichen in Translation entlang einer zu behandelnden Oberfläche (8).
  7. Verfahren zur Behandlung einer Oberfläche (8) durch Austreibung von Feststoffteilchen, die in einem Druckgasstrom mitgeführt werden, in welchem:
    die Teilchen mittels einer Düse ausgetrieben werden, die einen einzelnen Einlaß (3) zum Aufnehmen der in einem Druckgasstrom vermischten Feststoffteilchen und mit einem einzelnen Auslaß (4) zum Austreiben der Feststoffteilchen versehen ist, wobei der Auslaß (4) die Form eines länglichen Schlitzes hat, der eine Längsachse (12) aufweist und sich in Übereinstimmung mit dieser Längsachse zwischen zwei Enden erstreckt, wobei die Düse einen Kanal (6, 7) umfaßt, der in Strömungsrichtung der Feststoffteilchen zuerst aufweist ein konvergierendes Teilstück (6), das mit dem Einlaß (3) der Düse kommuniziert, und dann ein divergierendes Teilstück (7), das an dem Ende der Düse als der Auslaßschlitz (4) mündet und das über seine gesamte Länge einen Querschnitt mit einer parallel zu dem Auslaßschlitz abgeflachten Form aufweist, wobei der Kanal (6, 7) Veränderungen des Querschnitts aufweist, die sich über seine gesamte Länge fortsetzen, wobei das konvergierende Teilstück (6) ein stromabwärts liegendes Ende (5) umfaßt, das einen parallel zu dem Auslaßschlitz (4) abgeflachten Querschnitt aufweist, und das divergierende Teilstück (7) zwei Seitenränder (71) aufweist, die sich jeweils bis zu einem Ende des Auslaßschlitzes (4) entlang des divergierenden Teilstücks erstrecken, wobei das divergierende Teilstück (7) wenigstens zu seinem Auslaßschlitz (4) hin jeweils in der Nähe der zwei Seitenränder (71) zwei Bereiche mit erweitertem Querschnitt (41) umfaßt, wobei diese zwei Bereiche mit erweitertem Querschnitt durch wenigstens einen Bereich mit engerem Querschnitt getrennt sind,
    die Düse mit dem Gemisch aus Feststoffteilchen in dem Druckgastrom mit einer Leistung versorgt wird, die ausreicht, daß der Gasstrom in dem divergierenden Teilstück (7) Überschall hat,
    die Längsachse (12) des Auslaßschlitzes (4) im wesentlichen parallel zu der zu behandelnden Oberfläche (8) angeordnet wird,
    und die Düse im wesentlichen in Translation nach einer Richtung (9) verschoben wird, die parallel zu der zu behandelnden Oberfläche (8) liegt.
  8. Verfahren zur Oberflächenbehandlung nach Anspruch 7, in welchem die Translationsrichtung (9) der Düse (1) im wesentlichen rechtwinklig zur Längsachse (12) des Auslaßschlitzes der Düse ist.
  9. Verfahren zur Oberflächenbehandlung nach einem der Ansprüche 7 und 8, in welchem die Behandlung der Oberfläche ein Strahlvorgang ist.
  10. Verfahren zur Oberflächenbehandlung nach Anspruch 9, in welchem die ausgetriebenen Teilchen ausgewählt werden aus: Teilchen auf Stärkebasis und Teilchen auf Kunststoffbasis.
  11. Verfahren zur Oberflächenbehandlung nach einem der Ansprüche 9 und 10, in welchem die abzustrahlende Oberfläche eine Außenfläche eines Flugzeugs ist.
EP95902800A 1993-11-26 1994-11-25 Düse zur oberflächenbehandlung sowie vorrichtung und verfahren zur oberflächenbehandlung mit einer solchen düse Expired - Lifetime EP0730498B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9314190A FR2712826A1 (fr) 1993-11-26 1993-11-26 Buse de traitement de surface, et procédé de traitement de surface utilisant une telle buse.
FR9314190 1993-11-26
PCT/FR1994/001380 WO1995014536A1 (fr) 1993-11-26 1994-11-25 Buse de traitement de surface, et procede et dispositif de traitement de surface utilisant une telle buse

Publications (2)

Publication Number Publication Date
EP0730498A1 EP0730498A1 (de) 1996-09-11
EP0730498B1 true EP0730498B1 (de) 1998-04-08

Family

ID=9453275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95902800A Expired - Lifetime EP0730498B1 (de) 1993-11-26 1994-11-25 Düse zur oberflächenbehandlung sowie vorrichtung und verfahren zur oberflächenbehandlung mit einer solchen düse

Country Status (7)

Country Link
EP (1) EP0730498B1 (de)
AT (1) ATE164785T1 (de)
AU (1) AU1192395A (de)
CA (1) CA2177250A1 (de)
DE (1) DE69409542T2 (de)
FR (1) FR2712826A1 (de)
WO (1) WO1995014536A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPP860999A0 (en) * 1999-02-10 1999-03-04 Southern Rubber Pty Ltd Ultra high pressure liquid jet nozzle
US6293857B1 (en) 1999-04-06 2001-09-25 Robert Pauli Blast nozzle
GB2372718B (en) * 2001-01-04 2004-07-14 Workinter Ltd Nozzle intended for the concentrated distribution of a fluid for scouring of surfaces
CN103774529A (zh) * 2014-01-20 2014-05-07 南通东南公路工程有限公司 一种板式撒布机构
DE102023119415A1 (de) * 2023-07-21 2025-01-23 Alfred Kärcher SE & Co. KG Flachstrahldüsenanordnung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR737521A (fr) * 1932-03-17 1932-12-13 Pulvérisateur silencieux pour humidification de l'air par la vapeur
GB606036A (en) * 1945-01-01 1948-08-05 Alick Clarkson Venturi cleaning nozzle
US2605596A (en) * 1949-11-10 1952-08-05 William C Uhri Method of cleaning surfaces
FR1087496A (fr) * 1952-08-11 1955-02-24 Tuyère utilisable notamment pour projeter des matières abrasives entraînées par un jet d'air
US2971250A (en) * 1952-12-19 1961-02-14 Spraying Systems Co Spray nozzle with contoured orifice and method of contouring the orifice
WO1986002587A1 (en) * 1984-10-29 1986-05-09 Hardblast Australia Pty. Ltd. Nozzle for sand blasting
GB2191127A (en) * 1986-06-02 1987-12-09 Laing & Sons Ltd James Grit-blasting nozzle
FR2622814A1 (fr) * 1987-11-05 1989-05-12 Collard Catherine Diffuseur d'eau caracterise par la possibilite de nettoyage rapide sans interruption du jet d'eau
DE9209724U1 (de) * 1992-07-20 1992-11-26 Pocanschi, Adrian, Dr.-Ing., 7000 Stuttgart Strahldüse

Also Published As

Publication number Publication date
ATE164785T1 (de) 1998-04-15
WO1995014536A1 (fr) 1995-06-01
DE69409542T2 (de) 1998-10-29
EP0730498A1 (de) 1996-09-11
FR2712826A1 (fr) 1995-06-02
DE69409542D1 (de) 1998-05-14
AU1192395A (en) 1995-06-13
CA2177250A1 (en) 1995-06-01

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