EP2136965B1 - Dispositif et procédé pour la projection de particules grâce à des particules de gaz surgelées - Google Patents

Dispositif et procédé pour la projection de particules grâce à des particules de gaz surgelées Download PDF

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Publication number
EP2136965B1
EP2136965B1 EP08736171A EP08736171A EP2136965B1 EP 2136965 B1 EP2136965 B1 EP 2136965B1 EP 08736171 A EP08736171 A EP 08736171A EP 08736171 A EP08736171 A EP 08736171A EP 2136965 B1 EP2136965 B1 EP 2136965B1
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EP
European Patent Office
Prior art keywords
inlet
outlet opening
carrier gas
cavity
inner cavity
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
Application number
EP08736171A
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German (de)
English (en)
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EP2136965A1 (fr
Inventor
Robert Veit
Eckart Uhlmann
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.)
Technische Universitaet Berlin
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Technische Universitaet Berlin
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Publication date
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Publication of EP2136965A1 publication Critical patent/EP2136965A1/fr
Application granted granted Critical
Publication of EP2136965B1 publication Critical patent/EP2136965B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2

Definitions

  • the invention relates to an apparatus and a method for pressure blasting by means of a mixture jet of frozen gas particles and a carrier gas.
  • the invention relates to an apparatus and a method for CO 2 snow jetting by means of a mixture jet of frozen CO 2 gas particles and a carrier gas.
  • Frozen gas particles are particles of a substance that is gaseous at ordinary ambient temperature and pressure.
  • the low hardness of solid carbon dioxide enables the damage-free processing of a wide range of materials and the sublimation of the Blasting agent must be disposed of only the removed, sorted coating or contamination.
  • blasting agent When blasting by means of frozen gas particles, the blasting agent is pneumatically accelerated and applied to the surface to be processed.
  • blasting with frozen gas particles is based on three different mechanisms of action.
  • the low temperature of the blasting medium causes the thermal stress between coating and contamination of the substrate.
  • the kinetic energy of the frozen gas particles leads to a mechanical separation, which is supported by the third effect, the pressure surge due to the sudden sublimation of the frozen gas particles.
  • Such devices and methods are basically known and there are a variety of different types, which give the mixture jet of frozen gas particles and the carrier gas different properties in relation to, for example, speed, volume flow, size, number and expression of the frozen gas particles, so during operation a desired effect on the workpiece or the surface can be achieved.
  • the first type which is also referred to as a dry ice blaster
  • the second type which is also referred to as a snow blaster
  • first of the solid phase and second of the liquid phase produces the blended streams.
  • the blasting agent is produced in a separate process in the form of pellets or blocks and then added to the compressed air stream in a blasting system.
  • an object of the present invention is to provide a device for pressure jets with frozen gas particles, which has a small size and thus can be easily integrated into machinery and equipment
  • the present invention relates to a device for Compressive blasting by means of a mixture jet of frozen gas particles and a carrier gas according to the second type. Accordingly, in the devices described here, the blasting agent, in particular CO 2 , held in liquid form under pressure.
  • the frozen gas particles formed in the Zweistoffringdüse have in comparison to the jet nozzle with agglomeration chamber a smaller diameter and thus a low kinetic energy at the same speed. Therefore, the particles that are produced according to this construction variant, have little abrasive and therefore such devices are mainly used for the purification of finely structured, highly sensitive components. Such a device is in the DE 199 26 119 C2 described.
  • the liquefied gas is introduced together with the carrier gas stream into an agglomeration chamber and expanded.
  • larger snow particles are generated, which accelerate with the compressed air in a subsequent nozzle, resulting in a significantly higher abrasiveness.
  • the second design variant of the pressure-jet apparatus with agglomeration chamber has the disadvantages that a high pressure consumption can be recorded during operation.
  • frozen gas particles deposit on the outer walls and detach themselves at irregular intervals and in undefined size from the outer walls. This results in impulsive higher removal rates and thus in an inhomogeneous spray pattern.
  • Out DE 202 14 063 U1 is a CO 2 -Kaltgasdüse for pressure blasting by means of a mixture jet of CO 2 particles and compressed airsetting.CO 2 .
  • a dense fluid is introduced through an inner tube, which is surrounded by a gas line.
  • the streams of the gas and the dense fluid combine.
  • the inner tube is designed so that its end facing away from the inlet can be withdrawn into a chamber, which has a larger cross section compared to the constant cross section of the inner tube.
  • the document US 5,725,154 shows a device for pressure blasting according to the preamble of claim 1 with a spray gun for cleaning using a dense fluid such as CO 2 .
  • a dense fluid is introduced through an inner tube, which is surrounded by a gas line.
  • the streams of the gas and the dense fluid combine.
  • the inner tube is designed so that its end facing away from the inlet can be withdrawn into a chamber, which has a larger cross section compared to the constant cross section of the inner tube.
  • the aim of the present invention is therefore to provide a mixture jet technology, which is not covered by the known types and construction variants.
  • the aim of the present invention is the abrasiveness, ie in particular the size of the frozen gas particles, and the amount adjustable and thus to make their abrasiveness variable.
  • This object is achieved by a device for particle blasting with frozen particles, which holds the blasting medium in liquid form and thus belongs to the group of snow blasting.
  • the device has a nozzle housing, which encloses an outer and an inner cavity, as well as the features of claim 1.
  • the inner cavity thereby constitutes an expansion space having an inlet connected to the liquefied gas supply for introducing a liquefied gas at its upstream longitudinal end and an orifice at its downstream longitudinal end.
  • the mouth opening has a substantially larger cross-section than the inlet.
  • This inner cavity is at least in the region of its mouth, surrounded by an outer cavity which is connected to at least one carrier gas supply.
  • the inner cavity and the outer cavity have substantially round cross-sections.
  • An initially tapering acceleration nozzle adjoins the opening of the relaxation space and the outer cavity in the flow direction, which has a carrier gas inlet located laterally, in particular on all sides of the opening, as an outlet of the outer cavity.
  • the cross section of the carrier gas inlet according to the invention is variably adjustable.
  • a metering device which represents the inlet of the expansion space and is preferably designed as a relaxation or needle nozzle preferably with a variably adjustable inner diameter.
  • the flow diameter of the inner diameter of the metering device expands suddenly to the inner diameter of the expansion space.
  • the liquefied gas relaxes in the expansion space, forming a mixture of frozen gas particles and gas.
  • the diameter of the expansion space is designed so that the cross-section of the expansion space increases continuously downstream.
  • both the volume flow of the flowing into the expansion space liquefied gas, and the inflowing into the outer cavity carrier gas flow is variably adjustable.
  • the volume of the agglomeration space can also be variably adjusted according to a preferred embodiment of the invention.
  • the volume of the agglomeration space can be changed by moving the metering device, which is located in the transitional region between the feed of the liquefied gas and the expansion space, in the transition region and parallel to the flow direction can change the length or volume of the agglomeration space.
  • the agglomeration space can also be designed to be displaceable in the longitudinal axis, so that in this case too, the relative position of the metering device is displaceable in the transitional area and thus the volume of the agglomeration space is variable.
  • the volume of the relaxation space can also be designed to be variable by a differently adjustable inner diameter of the expansion space according to a further embodiment of the invention.
  • an essential aspect of the invention is that the opening cross section of the carrier gas inlet, which is formed between the outer contour of the expansion space and the inner contour of the inlet of the acceleration nozzle, is variably adjustable.
  • the device for pressure blasting by means of a mixture jet of frozen gas particles and a carrier gas is formed so that the mouth cross-section can be varied in that the relaxation space relative to the accelerating nozzle in the axial direction, relative to the longitudinal axis of the accelerating nozzle can be moved.
  • the said orifice cross-section is made variably adjustable in that the expansion space is displaced in the orthogonal direction relative to the longitudinal axis of the acceleration nozzle can.
  • the orifice cross-section at the said point can be varied in that the inner contour of the inlet of the acceleration nozzle and / or the outer contour of the outlet of the expansion space are designed to be variable at least on a portion of its circumference.
  • FIG. 1 shows a preferred embodiment of the invention in a cross-sectional view.
  • the illustrated apparatus for pressure blasting has a nozzle housing 4 which includes an outer cavity 6 and an inner cavity 2.
  • the inner cavity 2 is connected to a supply 7 for the introduction of liquefied gas into the inner cavity 2.
  • the outer cavity 6 in turn communicates with a supply 3 for the introduction of pressurized carrier gas into the outer cavity 6.
  • the inner cavity 2 is bounded at its one longitudinal end by an inlet 8, which is given according to the illustrated embodiment by the inner diameter of a metering device 1.
  • the metering device 1 is arranged in a transition region between the feed 7 and the inner cavity 2.
  • the metering device 1 is formed in the illustrated preferred embodiment as a needle nozzle and preferably has a diameter between 0.1 and 2 mm.
  • the inner cavity 2 connects itself with a much larger diameter of 3 mm to 50 mm.
  • the inner cavity 2 is also called relaxation space.
  • the inner cavity 2 is delimited at its other longitudinal end by a mouth 9 which is located downstream. From the inlet 8 of the inner cavity 2 to the mouth opening 9, the diameter of the expansion space 2 widens continuously in the flow direction and is preferably between 5 and 70 mm at the mouth opening 9. During the passage through the inner cavity 2, individual particles agglomerate with other particles. Therefore, the inner cavity 2, which represents the relaxation space, also referred to as agglomeration space.
  • an accelerating nozzle 5 which initially tapers in the flow direction and into which the mouth opening 9 of the expansion space 2 protrudes.
  • the accelerating nozzle 5 has at its narrowest point a diameter of preferably between 2 and 20 mm. Because the outer contour of the expansion chamber 2 has a smaller diameter in the region of its orifice 9 than the diameter of the inner contour in the transitional region between the inner contour of the outer cavity 6 and the inlet of the acceleration nozzle 5, an annular carrier gas inlet 10 results in the acceleration nozzle 5, which simultaneously exhausts the outer cavity 6 is.
  • the inner cavity 2 is designed to be displaceable in the axial direction with respect to the longitudinal axis of the accelerating nozzle 5 and opens into the accelerating nozzle 5 tapering there.
  • the cross section of the carrier gas inlet 10 can thereby be varied into the accelerating nozzle 5 by longitudinal displacement of the inner cavity 2.
  • the carrier gas inlet (10) preferably faces transversely to the longitudinal axis of the device, depending on the position of the orifice (9) within the device between the outer edge of the mouth (9) of the inner cavity (2) and the inner wall of the outer Cavity (6) or the acceleration nozzle (5) has a variably adjustable distance of between 0 and 2 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Nozzles (AREA)
  • Cleaning Or Drying Semiconductors (AREA)

Abstract

L'invention concerne un dispositif pour le sablage sous pression grâce à un jet mixte de particules d'un gaz congelé et d'un gaz porteur, comprenant un boîtier de buse, qui inclut une cavité extérieure et une cavité intérieure, parmi lesquelles la cavité intérieure présente un espace de détente, qui procure, au niveau de son extrémité longitudinale placée en amont du courant, une entrée pour l'introduction d'un gaz liquéfié dans l'espace de détente ainsi qu'une ouverture d'embouchure au niveau de son extrémité longitudinale placée en aval, l'ouverture d'embouchure présentant une section transversale essentiellement supérieure à l'entrée et parmi lesquelles la cavité extérieure entoure au moins partiellement la cavité intérieure au moins dans le secteur de l'ouverture d'embouchure, au moins une arrivée de gaz liquide, qui est reliée avec l'entrée de l'espace de détente, une arrivée de gaz porteur, qui est reliée avec la cavité extérieure, et une buse d'accélération, convergeant initialement en direction de l'écoulement et se raccordant en aval au niveau de l'ouverture d'embouchure de l'espace de détente et au niveau de la cavité extérieure, qui présente en tant que sortie de la cavité extérieure une entrée de gaz porteur, dont la section transversale peut être modifiée pour ajustement, se trouvant du côté de l'ouverture d'embouchure.

Claims (11)

  1. Dispositif pour jets sous pression au moyen d'un jet mixte de particules d'un gaz congelé et d'un gaz porteur, comprenant :
    - un boîtier de buse, qui inclut une cavité (6) extérieure et une cavité (2) intérieure,
    - parmi lesquelles, la cavité (2) intérieure présente un espace de détente, qui procure, au niveau de son extrémité longitudinale placée en amont, une entrée (8) pour l'introduction d'un gaz liquéfié dans l'espace de détente (2) ainsi qu'une ouverture d'embouchure (9) au niveau de son extrémité longitudinale placée en aval, l'ouverture d'embouchure (9) présentant une section transversale essentiellement supérieure à celle de l'entrée, et
    - parmi lesquelles, la cavité (6) extérieure entoure au moins partiellement la cavité (2) intérieure au moins dans le secteur de l'ouverture d'embouchure (9),
    - au moins une arrivée de gaz liquide qui est reliée à l'entrée (8) de l'espace de détente (2),
    - une arrivée de gaz porteur (3) qui est reliée à la cavité (6) extérieure, et
    - une buse d'accélération (5) se raccordant en aval à l'ouverture d'embouchure (9) de l'espace de détente (2) et à la cavité (6) extérieure, et se rétrécissant d'abord dans le sens d'écoulement, qui présente une entrée de gaz porteur (10) se trouvant sur le côté de l'ouverture d'embouchure (9) en tant que sortie de la cavité (6) extérieure, dont la section transversale peut être modifiée par ajustement ; caractérisée en ce que le diamètre intérieur de l'espace de détente (2) augmente constamment dans le sens d'écoulement depuis son extrémité longitudinale située en amont jusqu'à son extrémité longitudinale située en aval.
  2. Dispositif selon la revendication 1, caractérisé en ce que le diamètre de l'arrivée de gaz porteur (10) peut être modifié par un déplacement relatif de la cavité (2) intérieure par rapport à la buse d'accélération (5).
  3. Dispositif selon la revendication 2, caractérisé en ce que le déplacement de l'espace de détente (2) s'effectue dans le sens axial par rapport à l'axe longitudinal de la buse d'accélération (5).
  4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que la cavité (6) extérieure et la cavité (2) intérieure présentent des sections transversales essentiellement rondes.
  5. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que l'entrée (8) dans l'espace de détente (2) est formée par le diamètre intérieur d'un dispositif de dosage (1) sous la forme d'une buse de détente, qui présente un diamètre sensiblement inférieur au diamètre intérieur de l'espace de détente (2).
  6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que l'entrée de gaz porteur (10) présente une distance ajustable de façon variable entre 0 et 2 mm transversalement à l'axe longitudinal du dispositif entre le bord extérieur de l'ouverture d'embouchure (9) de la cavité (2) intérieure et la paroi intérieure de la cavité (6) extérieure ou la buse d'accélération (5).
  7. Dispositif selon l'une des revendications 1 à 6, caractérisé en ce que l'espace de détente (2) a un diamètre intérieur de l'ouverture d'embouchure (9) compris entre 5 et 70 mm.
  8. Dispositif selon l'une des revendications 1 à 7, caractérisé en ce qu'aussi bien le flux volumique du gaz liquéfié que celui du gaz porteur peuvent être modifiés.
  9. Dispositif selon l'une des revendications 1 à 8, le dispositif étant caractérisé en ce qu'il dispose d'un volume ajustable de façon variable de l'espace de détente (2).
  10. Dispositif selon l'une des revendications 1 à 9, caractérisé en ce que le volume de l'espace d'agglomération (2) est conçu ajustable de façon variable du fait que le dispositif de dosage (1), qui se trouve dans la zone de transition entre l'arrivée du gaz liquéfié (7) et l'espace de détente (2), peut être déplacé dans la zone de transition et parallèlement au sens d'écoulement, de telle sorte que la longueur, respectivement le volume, de l'espace d'agglomération (2) varie.
  11. Procédé pour le nettoyage ou le prétraitement de surfaces au moyen d'un jet mixte de particules d'un gaz congelé, en particulier des particules de C02, et d'un gaz porteur, le jet mixte étant généré à l'aide d'un dispositif selon la revendication 1.
EP08736171A 2007-04-13 2008-04-14 Dispositif et procédé pour la projection de particules grâce à des particules de gaz surgelées Not-in-force EP2136965B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007018338A DE102007018338B4 (de) 2007-04-13 2007-04-13 Vorrichtung und Verfahren zum Partikelstrahlen mittels gefrorener Gaspartikel
PCT/EP2008/054466 WO2008125648A1 (fr) 2007-04-13 2008-04-14 Dispositif et procédé pour la projection de particules grâce à des particules de gaz surgelées

Publications (2)

Publication Number Publication Date
EP2136965A1 EP2136965A1 (fr) 2009-12-30
EP2136965B1 true EP2136965B1 (fr) 2012-06-20

Family

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EP08736171A Not-in-force EP2136965B1 (fr) 2007-04-13 2008-04-14 Dispositif et procédé pour la projection de particules grâce à des particules de gaz surgelées

Country Status (4)

Country Link
US (1) US20100279587A1 (fr)
EP (1) EP2136965B1 (fr)
DE (1) DE102007018338B4 (fr)
WO (1) WO2008125648A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8187057B2 (en) 2009-01-05 2012-05-29 Cold Jet Llc Blast nozzle with blast media fragmenter
DE102010064406A1 (de) 2010-12-30 2012-07-05 ipal Gesellschaft für Patentverwertung Berlin mbH Vorrichtung und Verfahren zum Partikelstrahlen mittels gefrorener Gaspartikel
EP2961569A1 (fr) 2013-02-26 2016-01-06 Robert Veit Dispositif et procédé pour la projection de particules au moyen de particules de gaz congelées
US9931639B2 (en) 2014-01-16 2018-04-03 Cold Jet, Llc Blast media fragmenter
US10293464B2 (en) * 2015-05-05 2019-05-21 Corning Incorporated Abrading device
KR102335041B1 (ko) * 2020-04-17 2021-12-03 주식회사 바이오메카트로닉 드라이아이스 분무식 세정장치

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Also Published As

Publication number Publication date
DE102007018338B4 (de) 2010-09-23
DE102007018338A1 (de) 2008-10-16
US20100279587A1 (en) 2010-11-04
WO2008125648A1 (fr) 2008-10-23
EP2136965A1 (fr) 2009-12-30

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