WO1997029849A1 - 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
- WO1997029849A1 WO1997029849A1 PCT/EP1997/000636 EP9700636W WO9729849A1 WO 1997029849 A1 WO1997029849 A1 WO 1997029849A1 EP 9700636 W EP9700636 W EP 9700636W WO 9729849 A1 WO9729849 A1 WO 9729849A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure wave
- particle
- particle chamber
- igniter
- chamber
- Prior art date
Links
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 a volume having, in particular, a negative pressure, as z. B. for experiments in space.
- Particle clouds are of particular interest in quality assurance for testing purposes and in research. In both areas of application, it is desirable to generate controlled clouds from the small particles. This is not trivial, especially in a vacuum or, more generally, in negative pressure volumes (space), because the low gas / air content means that the frictional forces between the particles and the gas / air cannot contribute to cloud formation.
- a particle atomization device in which the dust to be metered is located in a cylindrical solid container and through a piston is evenly conveyed upwards.
- a rotating stainless steel brush removes a defined amount of the dust conveyed upwards and transports it into a fast air jet in which the dust is broken down into individual particles by shear forces and transported further.
- a constant air (gas) jet is therefore required here.
- the invention is based on the object of producing a device for the controlled generation of a particle cloud from a bed of predetermined particles and introducing it in a volume.
- This object is achieved according to the invention with the aid of a device for generating a particle cloud in a volume which in particular has a negative pressure, this device being provided with a particle chamber for receiving particles, the particle chamber having an inlet opening and an outlet opening , - A pressure wave generating device coupled to the inlet opening of the particle chamber for generating a pressure wave which penetrates into the chamber through the inlet opening and ejects the particles through the outlet opening, and a reflection surface arranged in the direction of propagation of the pressure wave passing through the outlet opening of the particle chambers and opposite the outlet opening of the particle chamber for reflection of the pressure wave in the direction of the
- a bed of predetermined particles is deagglomerated by expelling the particles from the receiving space of a particle chamber.
- this takes place by means of a pressure wave which penetrates into the receiving space of the particle chamber via the inlet opening, acts on the bed of particles accommodated there and ejects it through the outlet opening.
- the proportion of gas introduced into the particle chamber by means of the pressure wave, which then exits through the outlet opening, is so low that the equilibrium pressure in the volume into which the particle cloud is introduced does not change substantially and remains virtually the same.
- the geometry of at least a part of the volume into which the particle cloud is introduced is selected such that the pressure / shock wave emerging via the outlet opening is suitably reflected, so that the reflected shock wave can calm the movements of the particles of the cloud.
- the volume is limited, among other things, by a reflection surface, that of the outlet opening of the particle chamber is arranged opposite and in the direction of propagation of the pressure / shock wave passing through the outlet opening.
- This reflection surface is designed such that it reflects the pressure shock wave back onto the outlet opening of the particle chamber.
- This reflection surface is expediently designed to be essentially hemispherical, the particle chamber being arranged approximately in the center of an (imaginary) sphere which comprises the hemispherical reflection surface as the inner surface.
- An ignition element is arranged at one end of the ignition hollow line. The other end of the igniter hollow line is arranged opposite the inlet opening of the particle chamber. The igniter element is preferably blocked with the igniter hollow conductor.
- Pyrotechnic igniter hollow lines of the type described above are known from explosives technology.
- the ignition element is preferably a spark discharge element that is operated electrically.
- the spark which is formed between electrodes of the spark discharge element leads to an ignition (detonation / explosion) of the explosive on the inner wall of the ignition hollow line, which leads to a pressure / shock wave in the hollow line.
- This pressure / shock wave propagates in the hollow pipe and is further built up and maintained by the sequential ignition of the explosive on the inner surface of the hollow duct.
- the use of a pyro-technically operating pressure wave generating device of the aforementioned type is advantageous in that it can be used for generating pressure waves in a vacuum.
- the explosive charge (amount of explosive on the inner surface of the hollow line) is so small and matched to the volume into which the particle cloud is to be introduced that the gas ballast (ignition vapor) which is released when the particle bed is ejected from the particle chamber the volume penetrates, is negligible.
- the inlet and outlet openings of the particle chamber are advantageously closed by means of closure elements.
- closure elements have the task of preventing inadvertent escape of particles from the receiving space of the particle chamber.
- the closure elements are dispensable if it is possible to manipulate the particle bed at the outlet and inlet openings by means of suitable measures (compression, gluing) in such a way that there is no " unwanted escape of particles from the particle chamber.
- suitable measures compression, gluing
- care must be taken to ensure that the local solidification of the particle bed does not impair the deagglomeration of the particles
- the openings of the particle chamber are closed for transport purposes. By moving away or removing shortly before the particle cloud is put into operation, These openings are then released to the generating device.
- the closure elements are advantageously porous. This guarantees the gas exchange between the receiving chamber of the particle chambers and the environment when using the device according to the invention in a vacuum.
- Fig. 1 shows a longitudinal section through the device according to the invention when used in a vacuum chamber
- FIG. 1 shows a longitudinal section of a vacuum chamber 10, in which a device 12 for generating a particle cloud according to an embodiment of the invention is accommodated.
- the device 12 has a particle chamber 14 with a funnel-shaped receiving space 16 for a particle bed 18.
- the particle chamber 14 is provided with an inlet opening 20 and an outlet opening 22 opposite this, which form the two end faces of the hollow truncated cone of the funnel-shaped receiving space 16.
- the inlet opening 20 forms the smaller of the two end faces, so that the receiving space 16 widens conically from the inlet opening 20 towards the outlet opening 22.
- Both openings 20, 22 are covered by closure elements 24 in the form of porous foils 26.
- a pyro-technical ignition hose 28 Outside the particle combs 14 there is a pyro-technical ignition hose 28, the inside 30 of which is dusted with explosives 32.
- the ignition tube 28 has an ignition end 36 provided with an ignition element 34 and an outlet end 38 which is arranged opposite the inlet opening 20 and is held by a holding element 40 which is connected to the particle chamber 14.
- the holding element 40 has a through opening 42 which is arranged in alignment with the inlet opening.
- the holding element 40 lies in the receptacle 44 of an angular holding arm 46 which projects from the bottom wall of the vacuum chamber 10 and is fastened to the latter.
- the igniter tube 28 is insulated with the igniter element 34, which is to be indicated at 48 by a shrink tube.
- the ignition element 34 is a spark discharge ignition element, the electrical lines 50 of which are led through the wall of the vacuum chamber 10 out of the interior 52 thereof.
- the receptacle 44 of the holding arm 46 is designed such that the holding element 40 together with the ignition hose 28 extending therefrom and the particle chamber 14 from the side into the fork-shaped receptacle measure 44 can be used. This makes it possible to store the particle cloud generating device 12 prefabricated on the holding arm 46; assembly of the device 12 in the vacuum chamber 10 is therefore not necessary.
- the vacuum chamber 10 has a bottom wall 54, which is adjoined by a cylindrical first wall section 56 of the vacuum chamber 10.
- the Holding arm 46 arranged, in the region of its end facing away from the bottom wall 54.
- a semi-spherical second wall section 58 adjoins the cylindrical wall section 56.
- the positioning of the holding arm 46 within the vacuum chamber 10 is made such that the inlet opening 20 is located approximately in the center of an (imaginary) ball which encompasses the hemispherical second wall section 58.
- the cone angle of the receiving space 16 is selected such that the inner wall of the receiving space 16 extends essentially radially to the hemispherical second wall section 58.
- the igniter is provided with two pairs of electrodes, a discharge being generated via one of the two pairs of electrodes with high voltage but low capacitance, so that the electrode erosion generates a sufficient number of ions, so that the other of the two pairs of electrodes with lower voltage but higher capacity and also higher energy the discharge leading to the ignition is solved.
- the spark discharge thus presents itself as a step process.
- the spark discharge leads to an ignition of the explosive 32 and thus to the formation of a pressure / shock wave in the ignition tube 28. Successive detonation of the explosive 32 in the longitudinal extension of the ignition tube 28 leads to propagation and reinforcement of the shock wave in the ignition tube 28.
- This shock wave finally emerges at the outlet end 38 of the ignition tube 28 and strikes the porous film 26, which is easily tearable and breaks open as a result of the mechanical stress.
- the shock / pressure wave arrives in the receiving space 16 of the particle chamber 14, where it acts on the particle bed 18. Under pressure, the film 26 breaks open at the outlet opening 22 of the particle chamber 14, so that the particles of the bed 18 are pushed out of the funnel-shaped receiving space 16.
- the shock wave which consists of ignition fumes and thus of combustion gases from the explosive, propagates in the axial extension of the funnel-shaped receiving space 16 towards the hemispherical second wall section 58 of the vacuum chamber 10 in order to be reflected on the inner surface 60 of the second wall section 58 .
- the reflected shock / pressure wave acts on the ejected particles of the bed 18 and soothes their movements, so that the desired particle cloud is formed.
- the strength of the shock wave and the swath quantity can be changed over the length of the ignition hose 28. It is desirable to keep the amount of explosives as small as possible so that 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)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
- Particle Accelerators (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9528980A JP2000504622A (ja) | 1996-02-13 | 1997-02-12 | 空間、特に低圧の空間において静止粒子雲を発生する装置 |
DE59701172T DE59701172D1 (de) | 1996-02-13 | 1997-02-12 | Vorrichtung zum erzeugen einer stehenden partikelwolke in einem insbesondere einen unterdruck aufweisenden volumen |
EP97905012A EP0879094B1 (de) | 1996-02-13 | 1997-02-12 | Vorrichtung zum erzeugen einer stehenden partikelwolke in einem insbesondere einen unterdruck aufweisenden volumen |
US09/125,158 US6016978A (en) | 1996-02-13 | 1997-02-12 | Device for producing a stationary particle cloud in a space particularly at an underpressure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19605184.3 | 1996-02-13 | ||
DE19605184 | 1996-02-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997029849A1 true WO1997029849A1 (de) | 1997-08-21 |
Family
ID=7785234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/000636 WO1997029849A1 (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 |
---|---|---|---|---|
CN109001055A (zh) * | 2018-07-27 | 2018-12-14 | 北京理工大学 | 冲击加载实验装置 |
Families Citing this family (5)
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 |
AU2003282605A1 (en) * | 2002-10-11 | 2004-05-04 | Terrence S. Mcgarth | An axial atomic model for determination of elemental particle field structure and energy levels |
US7284987B2 (en) * | 2002-10-11 | 2007-10-23 | Mcgrath Terrence S | Physical quantum model for the atom |
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 |
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 |
Citations (5)
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 |
DE3136507A1 (de) * | 1981-09-15 | 1983-03-31 | Central'noe konstruktorskoe bjuro "Leninskaja Kuznica", Kiev | Explosionsbeschichtungsanlage |
US4872786A (en) * | 1987-04-06 | 1989-10-10 | Braden Thomas M | Solid particulate aerosol generator |
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 |
DE4426264A1 (de) * | 1994-07-25 | 1996-02-01 | Siemens Ag | Verfahren und Vorrichtung zur Erzeugung und Dosierung eines Pulveraerosols |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4725294A (en) * | 1987-03-13 | 1988-02-16 | Vlsi Standards, Inc. | Apparatus for collection of particulate matter from an ambient gas |
LU86900A1 (de) * | 1987-05-26 | 1988-06-13 | Euratom | Verfahren und vorrichtung zum entfernen einer aerosolwolke aus der luft |
US5173274A (en) * | 1991-08-16 | 1992-12-22 | Southwest Research Institute | Flash liquid aerosol production method and appartus |
-
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 DE DE59701172T patent/DE59701172D1/de not_active Expired - Fee Related
- 1997-02-12 EP EP97905012A patent/EP0879094B1/de not_active Expired - Lifetime
- 1997-02-12 WO PCT/EP1997/000636 patent/WO1997029849A1/de active IP Right Grant
Patent Citations (5)
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 |
DE3136507A1 (de) * | 1981-09-15 | 1983-03-31 | Central'noe konstruktorskoe bjuro "Leninskaja Kuznica", Kiev | Explosionsbeschichtungsanlage |
US4872786A (en) * | 1987-04-06 | 1989-10-10 | Braden Thomas M | Solid particulate aerosol generator |
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 |
DE4426264A1 (de) * | 1994-07-25 | 1996-02-01 | Siemens Ag | Verfahren und Vorrichtung zur Erzeugung und Dosierung eines Pulveraerosols |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109001055A (zh) * | 2018-07-27 | 2018-12-14 | 北京理工大学 | 冲击加载实验装置 |
Also Published As
Publication number | Publication date |
---|---|
EP0879094B1 (de) | 2000-03-01 |
EP0879094A1 (de) | 1998-11-25 |
JP2000504622A (ja) | 2000-04-18 |
US6016978A (en) | 2000-01-25 |
DE59701172D1 (de) | 2000-04-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69116868T2 (de) | Zündanlage | |
DE69223314T2 (de) | Druckgas-aerosolsystem mit einem dampfeinlass versehenen steigrohr | |
DE3608415C2 (de) | ||
DE1184176B (de) | Verfahren und Vorrichtung zum UEberziehen eines festen Koerpers mit einem Metall oder einer Metallverbindung | |
DE2417967A1 (de) | Gasbetriebenes werkzeug mit offenem laderaum und dafuer vorgesehenes gas erzeugendes beschickungsgut | |
DE2815087A1 (de) | Lenkvorrichtung fuer ein geschoss | |
DE2749219A1 (de) | Dosierventil | |
EP0268126A1 (de) | Verfahren zur Erhöhung der ausgegebenen Pulvermenge an einer Pulverbeschichtungsanlage sowie Pulverbeschichtungsanlage | |
DE1532901A1 (de) | Verfahren und Vorrichtung zum Vermischen,Absaugen und Verspruehen von Stroemungsmitteln | |
DE2152005A1 (de) | Hydraulische Kammer mit Austrittsduese | |
DE3220796C2 (de) | Zerstäubervorrichtung zum Beschichten mit Pulver | |
WO1997029849A1 (de) | Vorrichtung zum erzeugen einer stehenden partikelwolke in einem insbesondere einen unterdruck aufweisenden volumen | |
DE2717806C3 (de) | Detonationsbeschichtungsanlage | |
DE2234026A1 (de) | Verfahren zum verhindern des verstopfens von duesen in elektrostatischen beschichtungsanlagen | |
WO1991006377A1 (de) | Sprühkopf für sprühvorrichtung | |
DE3414245C2 (de) | ||
DE4003320C2 (de) | Geschoß für elektrothermische Beschleunigungsvorrichtungen | |
DE2121986A1 (de) | Elektrostatisches Sprühverfahren und Vorrichtung zur Durchführung des Verfahrens | |
DE3130181C2 (de) | Vorrichtung zum Veraschen von Feststoff-, Pasten- und/oder Flüssigkeitsproben | |
DE10119288B4 (de) | Verfahren und Einrichtung zur gasdynamischen Beschichtung von Oberflächen mittels Schalldüsen | |
DE1427677A1 (de) | Verfahren und Vorrichtung zum Farbspritzen | |
WO2018127346A1 (de) | Kanüle für ein medizinisches behandlungsinstrument zur abgabe eines abrasiven strömungsmediums, sowie medizinisches behandlungsinstrument | |
DE2441448A1 (de) | Vorrichtung zum aufbringen von spritzueberzuegen auf substrate | |
CH641691A5 (en) | Atomising method and atomising apparatus | |
DE3590860C2 (de) | Einrichtung zum Detonationsauftragen von ]berz}gen |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): DE JP US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1997905012 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 09125158 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 1997905012 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWG | Wipo information: grant in national office |
Ref document number: 1997905012 Country of ref document: EP |