EP0515449A1 - Dispositif de coupe et de nettoyage d'objets au moyen d'un melange d'eau et d'un produit abrasif sous une haute pression environnante. - Google Patents

Dispositif de coupe et de nettoyage d'objets au moyen d'un melange d'eau et d'un produit abrasif sous une haute pression environnante.

Info

Publication number
EP0515449A1
EP0515449A1 EP91903878A EP91903878A EP0515449A1 EP 0515449 A1 EP0515449 A1 EP 0515449A1 EP 91903878 A EP91903878 A EP 91903878A EP 91903878 A EP91903878 A EP 91903878A EP 0515449 A1 EP0515449 A1 EP 0515449A1
Authority
EP
European Patent Office
Prior art keywords
mixing chamber
chamber body
bore
abrasive
outlet 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.)
Granted
Application number
EP91903878A
Other languages
German (de)
English (en)
Other versions
EP0515449B1 (fr
Inventor
Hannes Domann
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.)
GKSS Forshungszentrum Geesthacht GmbH
Original Assignee
GKSS Forshungszentrum Geesthacht GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GKSS Forshungszentrum Geesthacht GmbH filed Critical GKSS Forshungszentrum Geesthacht GmbH
Publication of EP0515449A1 publication Critical patent/EP0515449A1/fr
Application granted granted Critical
Publication of EP0515449B1 publication Critical patent/EP0515449B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Definitions

  • the invention relates to a device for cutting and cleaning objects and for targeted material removal by means of a high-pressure, a mixing chamber from an inlet formed in a water inlet nozzle to an outlet traversing water jet which an abrasive passes through in the mixing chamber Introducing it into the water jet.
  • the mixing chamber is formed by a bore in a mixing chamber body which is axial to the inlet nozzle axis, the water nozzle inlet side. is limited by the water inlet nozzle.
  • the inside of the mixing chamber includes, is formed, in the device according to the invention there is only one axial bore to the water inlet nozzle axis, which can be formed as a mixing chamber of defined diameter and defined axial length. Since the jet widening of the water jet entering the mixing chamber increases in proportion to the ambient pressure, it is possible according to the invention due to the resulting reflection behavior of the water jet jacket with simple means to create an optimal inlet geometry over a defined pressure range of predetermined size, which with simple Means is directly adapted to the prevailing pressure, ie by predetermined axial length and / or predetermined diameter of the bore.
  • a major difficulty with devices of this type is that the high cutting performance of the device obtained in the manner described above, even at high ambient pressure, is not negated by the fact that losses in performance due to production errors-related axis errors occur between the inlet nozzle axis and outlet nozzle axis or outlet axis in the mixing chamber body . Manufacturing errors and / or assembly errors can have a very considerable influence on the performance of the device if they accumulate, with the result that the performance drops significantly.
  • the mixing chamber body is accommodated in a body holder, which on one side with a connecting piece for connection to a high pressure water source and on the other side is connected to a stop nut.
  • a body holder which on one side with a connecting piece for connection to a high pressure water source and on the other side is connected to a stop nut.
  • connections by means of threaded connections which, on the one hand, enable an automatic axis adjustment between the connector and thus the inlet nozzle on the one hand and on the other hand between the mixing chamber body and thus the outlet nozzle axis or the mixing chamber body axis.
  • threaded connections of this type can be loosened or fixed relatively quickly and thus without tools.
  • the actual outlet nozzle can be formed separately from mixing chamber bodies because of its special requirements regarding its hardness.
  • the essentially cylindrical mixing chamber body may be included lateral play in the substantially cylindrical bore of the body holder is added, so tolerances in To compensate for the seat of the water inlet nozzle in the connection piece without restricting the performance of the device, since it is essential to achieve an axial alignment between the inlet nozzle axis and the outlet nozzle axis.
  • Another advantage of a one-piece mixing chamber body with the outlet nozzle is the usually good correspondence between the axes of the mixing chamber bore and the outlet nozzle bore, which results from the manufacturing process. If the water nozzle is precisely fitted in the mixing chamber bore, this automatically results in an exact alignment of the water nozzle axis with the outlet nozzle axis.
  • the manufacturing tolerances of the body holder have no influence on the alignment of the axes.
  • a separate bushing device is accommodated in the stop nut, which has a bore for receiving an outlet nozzle separate from the mixing chamber body.
  • the mixing chamber body can be made of a material that is not as high-quality as the outlet nozzle as a simple cylindrical body, while the outlet nozzle is pressed against the mixing chamber body in axial alignment, end face to end face, by the stop nut, seated in the socket device .
  • the bore axis of the bore is eccentric to the axis of the bushing device.
  • the stop nut is closed with a union nut provided with a through hole, the free end of the outlet nozzle projecting through the through hole and between Union nut and bushing device, a connection agring, which is firmly connected to the outlet nozzle, is included.
  • the axial length of the mixing chamber is advantageously in the range between 2-4 mm.
  • the abrasive one! ate is advantageously introduced through the mixing chamber body into the mixing chamber, so that the geometry of the mixing chamber designed as a bore in the mixing chamber body described above is essentially not disturbed.
  • abrasive inlet by an abrasive tube which is interchangeably inserted into the abrasive inlet.
  • the abrasive inlet is preferably tapered towards the actual mixing chamber, so that an abrasive inlet opening into the mixing chamber body can be defined with a defined size.
  • the abrasive tube has an external thread which engages in a corresponding internal thread formed in the mixing chamber body and / or in the body holder, so that abrasive tubes of different geometries can be used very quickly can.
  • the mixing chamber is advantageously located at its outlet for the water-abrasive agent Seeing end tapered funnel-shaped.
  • the outlet nozzle is under very high mechanical stress due to the high mechanical influences on it by the water-abrasive mixture.
  • the outlet nozzle is made of a suitable hard material.
  • it can also be sensible and therefore advantageous to likewise form the mixing chamber body from the same hard material if, for example, the mixing chamber body and the outlet nozzle are manufactured in one piece, the increased material expenditure for the mixing chamber body then taking a back seat compared to the manufacturer ⁇ costs of separate mixing chamber body made of a special material.
  • an additional fluid supply device is advantageously provided in the outlet nozzle region.
  • This addition can take place vertically or at an acute angle in the jet direction to the outlet nozzle bore via one or more fluid channels or via an annular addition geometry. If an abrasive nozzle that is not formed in one piece with the mixing chamber body is used, this can preferably be done at the point of division. Different jet behavior can be achieved by the type of fluid and the fluid pressure.
  • the wet addition consisting of water and abrasive material can also be used in the device described here.
  • the pressure range in which the abrasive additives advantageously works can be between 1 and approx. 300 bar.
  • Fig. 1 in section of a first embodiment of the device
  • Fig. 2 in section a second embodiment of the device.
  • the device 10 essentially consists of a mixing chamber body 120 and a so-called connection piece 121, which is connected on a free side to a pressure line, not shown here, in a known manner.
  • the connecting piece 121 has a through hole which runs essentially centrally, through which the water brought in via the pressure line (not shown) passes according to the arrow 15.
  • a nozzle insert 19 is provided which, for example, comprises the water inlet nozzle 17 made of a hard material such as sapphire or the like.
  • the nozzle insert is seated in a conical seat in the connecting piece 121 formed at the lower end, based on the figures
  • Nozzle insert 19 has a through hole which passes through it essentially centrally, the one end of the through hole which points towards the mixing chamber 12 forming an inlet 13 of the water or water jet 15 into the mixing chamber 12.
  • the mixing chamber body 120 is essentially rotationally symmetrical in the form of a cylinder.
  • the actual mixing chamber 12 is formed by a bore which is axial to the inlet nozzle axis 18 and which is delimited on the water inlet nozzle side 19 by the water inlet nozzle 17.
  • the water inlet nozzle 17 protrudes into the mixing chamber, the water inlet nozzle 17 being supported with a flange-like collar 170 on the upper boundary surface 123 of the mixing chamber body 120.
  • the axial length 122 of the mixing chamber 12 is in the range of 2-8 mm, preferably in the range of 2-4 mm, with chamber diameters of 2-8 mm being advantageous, for example.
  • the abrasive agent 160 is introduced in a known manner into the water jet 15 passing through the mixing chamber 12 from the inlet 13 to an outlet 14, which is formed here in the mixing chamber body 120.
  • the water inlet nozzle axis 18 and thus that of the water jet 15 must be aligned with high precision axially to the outlet nozzle axis 24 or to the mixing chamber body axis 124 in order to ensure optimum energy transmission of the water jet 15 to the abrasive medium 160.
  • the mixing chamber body 120 is received in a body holder 25. This is connected on one side 250 to the connecting piece 121 and on the other side 151 to a stop nut 132 via threaded connections 152, 153 formed there in each case.
  • the mixing chamber body 120 itself is essentially cylindrical.
  • the bore 254 passing through the body holder 25 is also essentially cylindrical and is dimensioned such that the mixing chamber body 120 is received in it with radial play.
  • the mixing chamber body 120 is formed in one piece with the outlet nozzle 21, namely in the extension of the outward extension of the mixing chamber body 120.
  • the stop nut 32 which has a recess 34 in its inner bore 33, encloses the mixing chamber body 120, which is correspondingly tapered in diameter at this point.
  • the inner bore 33 has a larger diameter than the diameter of the outlet nozzle 21 formed as an extension in the mixing chamber body 120, the diameter being dimensioned such that the outlet nozzle 21 passes through the inner bore 33 with play.
  • the outlet nozzle 21 there can be a fluid channel 212 or a plurality of fluid channels which run at right angles or at an acute angle (here at 45 ') to the outlet nozzle axis 24.
  • the fluid channels are connected via an annular gap 321 to a fluid addition connection 36.
  • a pair of sealing rings 320 realizes the pressure closure from the environment.
  • the mixing chamber body 120 is formed separately from the outlet nozzle 21.
  • a separate bushing device 28 is received in the stop nut 32 there.
  • the bushing device 28 has a bore 29 for the passage or for receiving the outlet nozzle 21.
  • the bore axis 30 of the bore 29 can be formed eccentrically to the bushing device axis 31, so that error tolerances of all components of the device can be compensated in such a way that an axial alignment of the inlet nozzle axis 18, the mixing chamber axis 124 and the outlet nozzle axis 24 is achieved and an axial error goes to zero.
  • the stop nut 32 has an external thread 35 at its outward-pointing end, on which a union nut 40 provided with a through hole 38 is seated.
  • the diameter of the through hole 38 is dimensioned such that the outlet nozzle 21 projects through the through hole 38 with play.
  • Ate 19 is formed by an abrasive tube 161 that can be used therein and has an external thread 162.
  • the external thread 162 engages in a corresponding internal thread 225, which can be formed either in the mixing chamber body 120 and / or in the body holder 25.
  • the abrasive inlet 16 is conically tapered towards the mixing chamber 12, thus including it on the one hand a sealing ring creates a sealing seal between the mixing chamber 12 and the environment and, on the other hand, defined opening diameters can be provided in the abrasive medium pipe in accordance with the desired abrasive medium delivery rate. In this way, the abrasive agent pipe 161 can be replaced very quickly and selected according to the required conditions.
  • a defined distance between the lower edge 210 of the mixing chamber body and the upper edge of the outlet nozzle 21 can be set by an appropriately selected stop ring 39.
  • a targeted addition of fluid can take place via the resulting annular gap.
  • the fluid is supplied through a suitable hole in the stop nut.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

Un dispositif (10) sert à couper et à nettoyer des objets, ainsi qu'à enlever de manière appropriée des matériaux, au moyen d'un jet d'eau (15) sous haute pression qui traverse un conduit d'admission (13) agencé dans une buse (17) d'admission d'eau et un conduit (14). Un produit abrasif (160) est introduit dans la chambre de mélange (12) après avoir été ajouté au jet d'eau. La chambre de mélange (12) est formée d'un alésage axial par rapport à l'axe (18) de la buse d'admission, ménagé dans un corps (120) de chambre à mélange et délimité du côté (19) de la buse d'admission d'eau par la buse d'admission d'eau (17).
EP91903878A 1990-02-23 1991-02-20 Dispositif de coupe et de nettoyage d'objets au moyen d'un melange d'eau et d'un produit abrasif sous une haute pression environnante Expired - Lifetime EP0515449B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4005691A DE4005691A1 (de) 1990-02-23 1990-02-23 Vorrichtung zum schneiden und reinigen von gegenstaenden mittels eines wasser-abrasivmittel-gemisches bei hohem umgebungsdruck
DE4005691 1990-02-23
PCT/DE1991/000131 WO1991012930A1 (fr) 1990-02-23 1991-02-20 Dispositif de coupe et de nettoyage d'objets au moyen d'un melange d'eau et d'un produit abrasif sous une haute pression environnante

Publications (2)

Publication Number Publication Date
EP0515449A1 true EP0515449A1 (fr) 1992-12-02
EP0515449B1 EP0515449B1 (fr) 1994-11-30

Family

ID=6400792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91903878A Expired - Lifetime EP0515449B1 (fr) 1990-02-23 1991-02-20 Dispositif de coupe et de nettoyage d'objets au moyen d'un melange d'eau et d'un produit abrasif sous une haute pression environnante

Country Status (3)

Country Link
EP (1) EP0515449B1 (fr)
DE (2) DE4005691A1 (fr)
WO (1) WO1991012930A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19640921C1 (de) * 1996-10-04 1997-11-27 Saechsische Werkzeug Und Sonde Modularer Abrasivmittelwasserstrahl-Schneidkopf
GB0100756D0 (en) 2001-01-11 2001-02-21 Powderject Res Ltd Needleless syringe
US6601783B2 (en) 2001-04-25 2003-08-05 Dennis Chisum Abrasivejet nozzle and insert therefor
DE10249708A1 (de) * 2002-10-25 2004-05-06 Dürr Ecoclean GmbH Halterung für ein mit einem Fluid zu versorgendes Werkzeug und mit einem Fluid zu versorgendes Werkzeug
US7448151B2 (en) 2003-07-09 2008-11-11 Shell Oil Company Tool for excavating an object
RU2348786C2 (ru) 2003-07-09 2009-03-10 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Инструмент для проходки объекта
ATE374304T1 (de) 2003-10-29 2007-10-15 Shell Int Research Fluidstrahlbohrwerkzeug
GB0708758D0 (en) 2007-05-04 2007-06-13 Powderject Res Ltd Particle cassettes and process thereof
DE102010000478A1 (de) 2010-02-19 2011-08-25 Hammelmann Maschinenfabrik GmbH, 59302 Verfahren zur Funktionsunterbrechung eines Schneidstrahls sowie Vorrichtung zur Durchführung des Verfahrens
EP2431128A1 (fr) 2010-09-17 2012-03-21 Inflotek B.V. Procédé de fabrication d'un insert de filtrage ou de criblage à forme stable

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2290979A (en) * 1941-06-14 1942-07-28 Hydro Blast Corp Sandblasting device
US4449332A (en) * 1979-07-31 1984-05-22 Griffiths Norman J Dispenser for a jet of liquid bearing particulate abrasive material
US4478368A (en) * 1982-06-11 1984-10-23 Fluidyne Corporation High velocity particulate containing fluid jet apparatus and process
US4648215A (en) * 1982-10-22 1987-03-10 Flow Industries, Inc. Method and apparatus for forming a high velocity liquid abrasive jet
ZA86829B (en) * 1985-10-31 1986-10-29 Flow Ind Inc Nozzle attachment for abrasive fluid-jet cutting systems
US4817874A (en) * 1985-10-31 1989-04-04 Flow Systems, Inc. Nozzle attachment for abrasive fluid-jet cutting systems
US4934111A (en) * 1989-02-09 1990-06-19 Flow Research, Inc. Apparatus for piercing brittle materials with high velocity abrasive-laden waterjets
US4951429A (en) * 1989-04-07 1990-08-28 Flow Research, Inc. Abrasivejet nozzle assembly for small hole drilling and thin kerf cutting

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9112930A1 *

Also Published As

Publication number Publication date
WO1991012930A1 (fr) 1991-09-05
DE4005691A1 (de) 1991-08-29
EP0515449B1 (fr) 1994-11-30
DE59103698D1 (de) 1995-01-12

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