EP0879094B1 - Vorrichtung zum erzeugen einer stehenden partikelwolke in einem insbesondere einen unterdruck aufweisenden volumen - Google Patents
Vorrichtung zum erzeugen einer stehenden partikelwolke in einem insbesondere einen unterdruck aufweisenden volumen Download PDFInfo
- Publication number
- EP0879094B1 EP0879094B1 EP97905012A EP97905012A EP0879094B1 EP 0879094 B1 EP0879094 B1 EP 0879094B1 EP 97905012 A EP97905012 A EP 97905012A EP 97905012 A EP97905012 A EP 97905012A EP 0879094 B1 EP0879094 B1 EP 0879094B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- particle chamber
- particle
- ignition
- pressure
- aperture
- 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
Links
Images
Classifications
-
- 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
- B05B7/0006—Spraying by means of explosions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
-
- 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
- B05B7/1404—Arrangements for supplying particulate material
-
- 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
- Y10S239/01—Pattern sprinkler
Definitions
- the invention relates to a device for generating a standing particle cloud in one in particular a negative pressure volume, as z. B. for Experiments can be found in space.
- Particle clouds are particularly important in quality assurance for testing purposes and in the research of Interest. It is there in both areas of application desirable, controlled from the small particles To generate clouds. This is especially true in a vacuum or, more generally, in vacuum volumes (Space) not trivial, because there because of the small Gas / air share the frictional forces between the Particles and the gas / air do not cause cloud formation can contribute.
- a particle atomization device is in practice known in which the dust to be dosed in one cylindrical solid container is located and through a piston is evenly conveyed upwards.
- a rotating stainless steel brush carries a defined amount of the dust conveyed upwards and transported them in a quick stream of air in which the dust broken down into individual particles by shear forces and transported further becomes. So there is a constant air (gas) jet here required.
- the invention has for its object a device for the controlled generation of a particle cloud from a bed of predetermined particles generate and bring in a volume.
- a bed is specified Particles deagglomerated by removing the particles from the Recording space of a particle chamber are ejected. According to the invention, this takes place by means of a pressure wave, via the inlet opening into the receiving space of the particle chamber penetrates to the housed there Bed of particles acts and this through the outlet opening ejects.
- the means of Pressure wave introduced into the particle chamber which then exits through the outlet opening, so low that the equilibrium pressure in the volume into which the particle cloud was introduced is essentially not changed and almost the same remains. To do this, it is useful to determine the strength of the Pressure wave to the size of the volume into which the Particle cloud should be brought to vote.
- the geometry becomes at least one Part of the volume into which the particle cloud was introduced is selected such that the via the outlet opening escaping pressure / shock wave suitably reflected the reflected shock wave can be a Calming the movements of the particles of the cloud cause.
- the volume is among other things from a reflective surface limited that the outlet opening of the particle chamber opposite and in the direction of propagation through pressure / shock wave passing through the outlet opening is arranged.
- This reflection surface is designed in such a way that they push the pressure wave onto the exhaust port reflected back from the particle chamber.
- this reflection surface is essentially hemispherical, the particle chamber roughly at the center of an (imaginary) sphere is arranged, the hemispherical reflection surface as an inner surface.
- a pressure wave generating device a pyrotechnic device with a ignitable explosive charge suitable amount and in particular with a pyrotechnic igniter waveguide used
- the inner surface with explosive material is vaporized or dusted.
- the end of the igniter waveguide is an igniter arranged.
- the other end of the igniter waveguide is opposite the inlet opening of the particle chamber arranged.
- the ignition element is preferably connected to the Ignition tube condensed.
- Pyrotechnic igniter hollow lines of the previously described kind are known from the explosives technology. These waveguides are either flexible Hoses or designed as rigid pipes.
- Ignition element is preferably a Spark discharge element that is operated electrically. The between electrodes of the spark discharge element forming sparks lead to ignition (Detonation / explosion) of the explosive on the inner wall the igniter waveguide, making it a Comes pressure / shock wave in the hollow pipe.
- This Pressure / shock wave propagates in the hollow pipe and is caused by the sequential ignition of the explosive further built up on the inner surface of the waveguide and maintain.
- the use of a pyrotechnic working pressure wave generating device of the type mentioned above is advantageous in that when they were used for the generation of pressure waves in a vacuum can be.
- the explosive charge (amount of Explosives on the inner surface of the waveguide) so small and on the volume in which the particle cloud should be introduced, coordinated that the gas ballast (Kindling), which when the Particle pouring from the particle chamber into the volume penetrates, is negligible.
- the inlet and outlet openings the particle chamber closed by means of closure elements have the task an unintentional leakage of particles from the To prevent the space in the particle chamber.
- the closure elements are dispensable if the Particle bed at the outlet and inlet openings through suitable measures (compacting, gluing) to manipulate that it's not an unwanted Particles come out of the particle chamber.
- suitable measures compacting, gluing
- all of these measures must take into account that it is due to the local solidification the particle bed does not interfere the deagglomeration of the particles comes.
- Can also the closure elements designed and / or with the Particle chamber to be connected to release the openings are movable (slides or discs). The openings of the particle chamber are for transport purposes locked. By moving away or removing shortly before the commissioning of the particle cloud generating device then these openings are released.
- the closure elements are advantageously porous educated. This guarantees gas exchange between the receiving space of the particle chamber and the environment when using the device according to the invention in Vacuum.
- a vacuum chamber 10 is shown in longitudinal section, in which a device 12 for generation a particle cloud according to an embodiment of the Invention is housed.
- the device 12 has a particle chamber 14 with a funnel-shaped receiving space 16 for a particle bed 18.
- the Particle chamber 14 has an inlet opening 20 and provided an outlet opening 22 opposite this, the the two end faces of the hollow truncated cone form the funnel-shaped receiving space 16.
- the inlet opening 20 forms the smaller of the two End faces, so that the receiving space 16 starts from the inlet opening 20 conical to the outlet opening 22 enlarged towards.
- Both openings 20, 22 are through closure elements 24 covered in the form of porous films 26.
- the ignition tube 28 has an igniter provided with an igniter 34 36 and an outlet end 38 on that of the inlet opening 20 arranged opposite one another Holding element 40 is held, which with the particle chamber 14 is connected.
- the holding element 40 has one Through opening 42 on that with the inlet opening is aligned.
- the holding element 40 lies in the receptacle 44 of an angled holding arm 46, the the bottom wall of the vacuum chamber 10 rises and on this is attached.
- the ignition tube is at its ignition end 36 28 damaged with the igniter 34, which at 48 should be indicated by a shrink tube.
- the ignition element 34 is a spark discharge ignition element, whose electrical lines 50 through the wall of the vacuum chamber 10 whose interior 52 are led out.
- the recording is 44 of the holding arm 46 formed such that the Holding element 40 together with itself extending ignition tube 28 and the particle chamber 14 from the side into the fork-shaped receptacle 44 can be used.
- This makes it possible to Particle cloud generating device 12 prefabricated to support the arm 46; an assembly of the device 12 in the vacuum chamber 10 is therefore not required.
- the vacuum chamber 10 a bottom wall 54 on which a cylindrical first wall section 56 of the vacuum chamber 10 connects.
- the Holding arm 46 arranged, in the region of the the end facing away from the bottom wall 54.
- On the cylindrical Wall section 56 closes a hemispherical second wall section 58.
- the positioning of the Holding arms 46 within the vacuum chamber 10 is included hit such that the inlet opening 20 approximately in The center of an (imaginary) sphere is the includes hemispherical second wall portion 58.
- the cone angle of the receiving space 16 chosen such that the inner wall of the receiving space 16th essentially radial to the hemispherical second Wall section 58 runs.
- the spark discharge leads to an ignition of the explosive 32 and thus for training a pressure / shock wave in the ignition hose 28.
- the ignition tube 28 is elongated a propagation and amplification of the shock wave in Ignition hose 28.
- This shock wave finally occurs Exit end 38 of the ignition tube 28 and hits on the porous film 26, which is easily tearable and breaks up due to mechanical stress.
- the Shock / pressure wave enters the receiving space 16 Particle chamber 14, where it hits the particle bed 18 acts.
- the film 26 breaks under pressure Outlet opening 22 of the particle chamber 14 so that the Particles of the bed 18 from the funnel-shaped receiving space 16 are pushed out.
- the shock wave that from fumes and thus from combustion gases of the Explosives, spreads in axial extension of the funnel-shaped receiving space 16 for hemispherical second wall section 58 of the vacuum chamber 10 out to the inner surface 60 of the second Wall section 58 to be reflected.
- the reflected Shock / pressure wave acts on the ejected Particles of the bed 18 and soothes them Movements so that it can form the desired Particle cloud is coming.
- Over the length of the ignition tube 28 can be the strength of the shock wave and the Swath quantity can be changed. It is desirable keep the amount of explosives as small as possible, thus the gas ballast consisting of the combustion gases is as low as possible.
Landscapes
- Physical Or Chemical Processes And Apparatus (AREA)
- Measuring Fluid Pressure (AREA)
- Particle Accelerators (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Description
- einer Partikelkammer zur Aufnahme von Partikeln,
- wobei die Partikelkammer eine Einlaßöffnung und eine Auslaßöffnung aufweist,
- einer mit der Einlaßöffnung der Partikelkammer gekoppelten Druckwellen-Erzeugungsvorrichtung zum Erzeugen einer Druckwelle, die durch die Einlaßöffnung in die Kammer eindringt und die Partikel durch die Auslaßöffnung ausstößt, und
- einer in Ausbreitungsrichtung der durch die Auslaßöffnung der Partikelkammer hindurchtretenden Druckwelle angeordneten und der Auslaßöffnung der Partikelkammer gegenüberliegenden Reflexionsfläche zur Reflexion der Druckwelle in Richtung auf die Auslaßöffnung der Partikelkammer.
- Fig. 1
- einen Längsschnitt durch die erfindungsgemäße Vorrichtung bei deren Verwendung in einer Vakuumkammer und
- Fig. 2
- einen Schnitt entlang der Linie II-II der Fig. 1.
Claims (9)
- Vorrichtung zum Erzeugen einer stehenden Partikelwolke in einem insbesondere einen Unterdruck aufweisenden Volumen, miteiner Partikelkammer (14) mit einem Aufnahmeraum (16) zur Aufnahme von Partikeln (18),wobei die Partikelkammer (14) eine Einlaß- und eine Auslaßöffnung (20,22) aufweist,einer mit der Einlaßöffnung (20) der Partikelkammer (14) gekoppelte Druckwellen-Erzeugungsvorrichtung (28,34) zum Erzeugen einer Druckwelle, die durch die Einlaßöffnung (20) in den Aufnahmeraum (16) der Partikelkammer (14) eindringt und die Partikel (18) durch die Auslaßöffnung (22) ausstößt, undeiner in Ausbreitungsrichtung der durch die Auslaßöffnung (22) der Partikelkammer (14) hindurchtretenden Druckwelle angeordneten und der Auslaßöffnung (22) der Partikelkammer (14) gegenüberliegenden Reflexionsfläche (60) zur Reflexion der Druckwelle in Richtung auf die Auslaßöffnung (22) der Partikelkammer (14).
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Einlaß- und die Auslaßöffnung (20,22) jeweils von einem Verschlußelement (26) verschlossen sind, durch die hindurch die Druckwelle hindurchtritt und/oder die infolge der Druckwelle aufbersten und die betreffende Öffnung (20,22) freigeben.
- Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß jedes Verschlußelement (26) eine insbesondere poröse Folie ist.
- Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Druckwellen-Erzeugungsvorrichtung eine pyrotechnische Anzünd-Hohlleitung (28) aufweist, deren Innenseite (30) mit explosivem Material (32) versehen ist, wobei an dem einen Ende (36) der Anzünd-Hohlleitung (28) ein Anzündelement (34) und das andere Ende (38) der Anzünd-Hohlleitung (28) der Einlaßöffnung (20) der Partikelkammer (14) gegenüberliegend angeordnet ist.
- Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Anzündelement (34) mit der Anzünd-Hohlleitung (28) verdämmt ist.
- Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Aufnahmeraum (16) der Partikelkammer (14) kegelstumpfförmig ausgebildet ist, wobei die Einlaßöffnung (20) an der kleineren Stirnseite und die Auslaßöffnung (22) an der größeren Stirnseite des Kegelstumpfs angeordnet ist.
- Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Druckwellen-Erzeugungsvorrichtung (28,34) eine Sprengstoff-ladung zur Erzeugung der Druckwelle durch Explosion der Sprengstoff-Ladung aufweist.
- Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Reflexionsfläche (60) im wesentlichen eine Halbkugel-Innenfläche ist und daß die Partikelkammer (14) im wesentlichen im Mittelpunkt einer die halbkugelförmige Reflexionsfläche (60) umfassenden gedachten Kugel angeordnet ist.
- Vorrichtung nach einem der vorhergehenden Ansprüche, sofern auf Anspruch 8 und 6 rückbezogen, dadurch gekennzeichnet, daß der kegelstumpfförmige Aufnahmeraum (16) eine im wesentlichen sich radial zur halbkugelförmigen Reflexionsfläche (60) erstreckende Wandung aufweist.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19605184 | 1996-02-13 | ||
| DE19605184 | 1996-02-13 | ||
| PCT/EP1997/000636 WO1997029849A1 (de) | 1996-02-13 | 1997-02-12 | Vorrichtung zum erzeugen einer stehenden partikelwolke in einem insbesondere einen unterdruck aufweisenden volumen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0879094A1 EP0879094A1 (de) | 1998-11-25 |
| EP0879094B1 true EP0879094B1 (de) | 2000-03-01 |
Family
ID=7785234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97905012A Expired - Lifetime EP0879094B1 (de) | 1996-02-13 | 1997-02-12 | Vorrichtung zum erzeugen einer stehenden partikelwolke in einem insbesondere einen unterdruck aufweisenden volumen |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6016978A (de) |
| EP (1) | EP0879094B1 (de) |
| JP (1) | JP2000504622A (de) |
| DE (1) | DE59701172D1 (de) |
| WO (1) | WO1997029849A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19836723B4 (de) * | 1998-08-13 | 2008-04-24 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Verfahren zur Homogenisierung von Staubverteilungen |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7284987B2 (en) * | 2002-10-11 | 2007-10-23 | Mcgrath Terrence S | Physical quantum model for the atom |
| WO2004034030A2 (en) * | 2002-10-11 | 2004-04-22 | Mcgarth Terrence S | An axial atomic model for determination of elemental particle field structure and energy levels |
| RU2551378C2 (ru) * | 2013-09-10 | 2015-05-20 | Федеральное государственное казенное учреждение "12 Центральный научно-исследовательский институт" Министерства обороны Российской Федерации | Распылитель порошкообразных веществ импульсного действия |
| CN109001055B (zh) * | 2018-07-27 | 2019-11-19 | 北京理工大学 | 冲击加载实验装置 |
| JP7488482B2 (ja) * | 2022-05-02 | 2024-05-22 | ダイキン工業株式会社 | パルス電源装置 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1459359A (fr) * | 1965-10-18 | 1966-04-29 | Dynamit Nobel Ag | Procédé et dispositif pour la pulvérisation de liquides, de solutions, de suspensions ou de matières solides sous forme de poussière, de poudre ou analogue, à l'aide du jet de poussée d'un moteur-fusée |
| DE3136507C2 (de) * | 1981-09-15 | 1985-07-11 | Central'noe konstruktorskoe bjuro "Leninskaja Kuznica", Kiev | Explosionsbeschichtungsanlage |
| US4725294A (en) * | 1987-03-13 | 1988-02-16 | Vlsi Standards, Inc. | Apparatus for collection of particulate matter from an ambient gas |
| US4872786A (en) * | 1987-04-06 | 1989-10-10 | Braden Thomas M | Solid particulate aerosol generator |
| LU86900A1 (de) * | 1987-05-26 | 1988-06-13 | Euratom | Verfahren und vorrichtung zum entfernen einer aerosolwolke aus der luft |
| DE3826101A1 (de) * | 1988-08-01 | 1990-02-15 | Heyer Gmbh Carl | Einrichtung zum mechanischen erregen eines in einem behaelter befindlichen fliessfaehigen stoffes mittels ultraschall, mit einer fuellstandsueberwachung fuer den im behaelter befindlichen stoff |
| US5173274A (en) * | 1991-08-16 | 1992-12-22 | Southwest Research Institute | Flash liquid aerosol production method and appartus |
| DE4426264A1 (de) * | 1994-07-25 | 1996-02-01 | Siemens Ag | Verfahren und Vorrichtung zur Erzeugung und Dosierung eines Pulveraerosols |
-
1997
- 1997-02-12 US US09/125,158 patent/US6016978A/en not_active Expired - Fee Related
- 1997-02-12 JP JP9528980A patent/JP2000504622A/ja active Pending
- 1997-02-12 WO PCT/EP1997/000636 patent/WO1997029849A1/de not_active Ceased
- 1997-02-12 DE DE59701172T patent/DE59701172D1/de not_active Expired - Fee Related
- 1997-02-12 EP EP97905012A patent/EP0879094B1/de not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19836723B4 (de) * | 1998-08-13 | 2008-04-24 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Verfahren zur Homogenisierung von Staubverteilungen |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997029849A1 (de) | 1997-08-21 |
| DE59701172D1 (de) | 2000-04-06 |
| US6016978A (en) | 2000-01-25 |
| EP0879094A1 (de) | 1998-11-25 |
| JP2000504622A (ja) | 2000-04-18 |
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