EP0423572B1 - Apparatus for production of a pressure wave - Google Patents

Apparatus for production of a pressure wave Download PDF

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Publication number
EP0423572B1
EP0423572B1 EP90119210A EP90119210A EP0423572B1 EP 0423572 B1 EP0423572 B1 EP 0423572B1 EP 90119210 A EP90119210 A EP 90119210A EP 90119210 A EP90119210 A EP 90119210A EP 0423572 B1 EP0423572 B1 EP 0423572B1
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EP
European Patent Office
Prior art keywords
valve disc
pipe
pressure chamber
pressure
valve
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EP90119210A
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German (de)
French (fr)
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EP0423572A1 (en
Inventor
Hans-Otto Schwarze
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HOSCH-COMPANY
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HOSCH-COMPANY
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Publication of EP0423572A1 publication Critical patent/EP0423572A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
    • B65D88/70—Large containers characterised by means facilitating filling or emptying preventing bridge formation using fluid jets
    • B65D88/706—Aerating means, e.g. one-way check valves

Definitions

  • the invention relates to a device for intermittent generation of a pressure wave in silos or other containers, in which a tube for releasing the pressure waves, a storage housing surrounding the tube for the accumulation of compressed air and a flat sealing element are present, which are in the charged, idle state at the inner end of the Tube is present, on the side facing away from the tube a pressure chamber, on one side with the internal pressure of the pressure chamber and on the other side outside of the tube with the pressure of the accumulator housing and in the event of tripping by venting the pressure chamber to establish a connection between the accumulator housing and the tube lifts off from the pipe end, the storage housing being fillable via a passage which encloses the pressure chamber.
  • a device of this type in which a valve plate can be moved within a connecting piece, which alternately seals the tube for releasing the pressure waves or the outlet of the pressure chamber.
  • a separate channel for filling the storage housing which is operated using a separate valve.
  • such a device is known from the French company Ermap, in which, instead of the washer sealingly guided in a pipe socket, a membrane is clamped above the valve-side pipe end, which closes off the pressure chamber.
  • the membrane has a calibrated bore outside the surface of the pipe for releasing the pressure waves. Filling takes place via the pressure chamber using the same opening through which the pressure chamber is also vented.
  • the flat sealing element is a non-clamped valve disc, the edge of which is elastic enough on the one hand to let the compressed air from the pressure chamber into the storage housing during filling, and on the other hand is rigid enough to at least the valve disc center roughly, the pressure chamber at least partially overlaps the edge section of the valve disk and the valve disk tends to stiffen in its central section.
  • a piston seal is presented on a device of the same type, which is designed to be air-permeable in one direction, but sealing in the other direction. This requires the use of simple sealing sleeves, which inherently have this property due to their U-shaped cross section and without exception exhibit.
  • valve disc is designed in coordination with the pressure chamber, in such a way that, when it is filled, it leaves the compressed air let into the pressure chamber into the storage housing without any significant resistance, but on the other hand seals it so well against the pressure chamber that it seals in the case of venting the pressure chamber after a filling process, the inner opening of the tube for releasing the pressure waves is safely released.
  • An axially displaceable and non-clamped valve disc in the form of a flat sealing element is already known as a blocking element of a check valve (CH-A-558 492).
  • a valve disc with the central part of which can block the opening of the axial flow channel of a nozzle by pressing the central part of the valve disc against the opening edge of the nozzle and after reversing the direction of flow of the medium the flow through it can be achieved by opening the opening.
  • the valve disk is moved axially until it rests against a spring washer, and the medium can flow past the valve disk because the valve disk has a smaller diameter than the surrounding housing and thus an annular flow channel is formed between the valve disk and the inner wall of the housing becomes.
  • the flow channel of the nozzle is closed by the valve disc, there is no flow around the valve disc, as is necessary for the device according to the invention for filling the accumulator.
  • no comparable flow of the medium occurs in the known non-return valve, as occurs in the device according to the invention, when the compressed air suddenly flows out of the accumulator past the underside of the valve disc through the inner opening of the tube to the outside to generate a pressure wave.
  • the edge of the valve disk must be elastically deformable in the device according to the invention.
  • valve disc an extremely soft material quality can be selected for the outer edge of the valve disc, which may have some ripple in the untensioned state.
  • stiffness must have a certain minimum size so that the valve disc remains somewhat centered in the device, since the valve disc is preferably unguided except through the pressure chamber edge or the inner wall of the storage housing. If a very elastic quality is selected for the valve disc for cost reasons or for reasons of the particularly low masses, it may be expedient to reinforce the valve disc with a support disc which is arranged, for example, on the side of the valve disc facing away from the pipe end or as a core insert in the Valve disc is inserted.
  • the device can be charged for a triggering event in a few seconds because the filling is not hindered by a restriction or the like at any point. Due to the quick fillability, the number of devices required for emptying a silo can often be reduced. A prerequisite is, of course, a correspondingly generous air flow for quick filling of the device.
  • valve disk only has to be held approximately in its position in order to keep it essentially centered. This simplifies the production even further, because blanks punched out of meter goods can be used as valve disks.
  • a very precise central assignment of the pressure chamber to the pipe is not necessary, since this is not important. Even without a central position, there is the desired sealing at the respective points, so that again extremely low requirements must be placed on the precision of the device. This makes the manufacture cheaper.
  • valve disc must be stiff enough to be able to withstand the differential pressure between the pressure chamber and the pipe in the charged idle state without any significant deformation.
  • the valve disk is provided with a reinforcement in its middle section, which should be light-weight for reasons of low inertia.
  • the valve disc then acts as a pure seal, which provides a seal between the support disc and the inner tube end when the device is loaded.
  • the support disk is attached to the valve disk with a central rivet.
  • the support disc consists, for example, of a circular aluminum plate.
  • valve disk from a thin, flexible metal disk, the sealing then being effected by a temperature-resistant ring made of plastic, cork or even aluminum, which is fastened to the metal plate and points towards the inner end of the tube.
  • FIG. 1 of a device consists of a tubular storage housing 1, which is closed at both ends with a lower cover 2 and an upper cover 3 with the aid of conventional screw connections.
  • a tube 5 is welded into the lower cover 2, while there is an opening 4 in the upper cover 3. It is used to hold a valve or a line, at the end of which there is a valve, with the help of which filling with compressed air or quick ventilation is possible at this point.
  • the tube 5 is used for releasing pressure waves, which in turn are used to loosen free-flowing material in silos or other containers which tend to form bridges, stick or are difficult to free-flow for other reasons.
  • a pressure chamber 7 is formed below the upper cover 3 with the aid of a pressure chamber housing 6 and is closed on its lower side by means of a valve disk 10.
  • the wall 8 of the pressure chamber 7 is smooth with no jagged transitions because it serves as a support surface for the valve disc 10 when pressure waves are emitted.
  • the exemplary embodiments shown in the figures of the drawing are present in single or multiple numbers at predetermined locations on funnels or on the inner wall of storage containers or silos and can emit a violent pressure jet in the form of a pressure wave, which has a dissolving effect on free-flowing bulk material.
  • Compressed air is admitted into the pressure chamber 7 via the valve already mentioned, which presses the slightly elastic valve disk 10 at the contact point with the pressure chamber housing 6 to release a passage gap.
  • the storage housing 1 fills with compressed air, the valve disc 10 being pressed onto the inner end of the tube 5 in a sealing manner with increasing force due to the lack of counterpressure within the tube 5.
  • valve disk 10 After filling, the valve disk 10 returns to the starting position shown, in which its edge lies more or less loosely on the pressure chamber housing 6. At this contact point, there may even be residual gaps or small openings; the only thing that matters is that there are no openings that are too large in the contact zone.
  • the area of the annular gap "s" should be chosen so that it corresponds approximately to the cross-sectional area of the tube 5. As a result, there is virtually no traffic jam at this point, which is conducive to rapid emptying of the storage housing 1 through the pipe 5.
  • the light weight of the valve disc 10 ensures a particularly sudden release of the inner end of the tube 5 when triggered, which leads to excellent results.
  • the pressure wave leaving the device is very strong, on the other hand, the range is considerable.
  • the storage housing 1, the tube 5 and the valve disk 10 are circular and are arranged concentrically to one another.
  • Rectangular or square shapes are also possible if appropriate installation conditions or the like call for these shapes.
  • the valve disc 10 is subjected to practically no stresses, if one disregards the pressure on the end of the tube in the loaded idle state and the slight deflection during emptying of the storage housing 1.
  • Cheapest materials and simplest designs can therefore be preferred so that result in favorable manufacturing costs.
  • the valve disk 10 is provided on its side facing the pressure chamber 7 with a support disk 11 which is fastened with the aid of a clip 20.
  • a bulbous disk 21 can be provided to prevent the valve disk 10 from sliding off the clip 20.
  • the valve disk 10 is centered together with the support disk 11 by the storage housing 1, which is produced as a welded construction including a tube and flanges.
  • the pressure chamber 7 is delimited by a pressure chamber housing 6, which consists of an internally conical ring with a bevel 15. Otherwise, the function is as described above, but the valve disk 10 forms a unit with the support disk 11, which is raised from the inner end of the tube 5 when triggered.
  • the exemplary embodiment shown in FIG. 3 differs from the ones described above primarily in that the pressure chamber housing 6 is designed as a simple ring.
  • the support disk 11 strikes the cover 3 of the storage housing 1, which does not further bother.
  • the elastic valve disk 10 rests against the inside of the chamber housing 6, which is designed as a ring, and returns to the state shown in FIG. 3 when it is filled.
  • valve disk 10 and the support disk 11 are shown for clarification, connected by a clip 20 with a bulbous disk 21, in order to be able to recognize details more precisely.
  • the support plate 11 is completely enclosed, that is covered by the elastic material of the valve plate 10 also on the side facing the pressure chamber.
  • this exemplary embodiment is particularly suitable for pressure chambers 7 which are completely flat in themselves. The impact in the event of a trigger is well dampened.
  • the exemplary embodiment shown in FIG. 6 differs from the exemplary embodiments described above in that the valve disk 10 is held on the side facing away from the pressure chamber 7 with the aid of a support ring 22.
  • the support ring 22 is welded to the storage housing 1 and bears openings 23 at intervals which let the air in the storage housing 1 pass when it is filled. If necessary. the valve disk 10 bulges slightly under pressure when filling between the tube 5 and the inside of the ring 22, so that the outer edge of the valve disk 10 is slightly pulled inwards. This opens the openings 23.
  • valve disc 10 After filling, the valve disc 10, which can be made of a very elastic quality, takes up the position shown in FIG. 6 again. The same applies after a shot, during which the valve disk 10 is lifted off the tube 5. During this lifting, too, the outer edge of the valve disk 10 is pulled slightly inward, but it remains in the region of the support ring 23, so that its position is maintained. In addition, a modification of the attachment of the support disk 11 to the valve disk 10 can be seen in FIG. 6, which primarily indicates that all possible attachments can be considered at this point.
  • the devices presented are generally only used when necessary because they have a relatively high air consumption and compressed air is relatively expensive.
  • Another advantage of the device is that the valve disc 10 closes the tube 5 in the idle state, so that dusts located in the corresponding silo container cannot penetrate the device. A deposit within the tube 5 is harmless and does not last long; At the latest when the next pressure wave is released, these deposits are blown out.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Check Valves (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Pens And Brushes (AREA)
  • Soil Working Implements (AREA)
  • External Artificial Organs (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Surgical Instruments (AREA)
  • Control Of Fluid Pressure (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Vending Machines For Individual Products (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Safety Valves (AREA)

Abstract

The invention relates to an apparatus for the intermittent production of a pressure wave in hoppers or other containers. For release of a pressure wave, a valve which, according to the invention, consists of a simple valve disc (10) between a storage housing (1) and an outlet pipe is opened suddenly. The opening of this passage by raising the valve disc (10) from the pipe (5) takes place in the usual manner by venting a pressure chamber (7) adjoining the valve disc (10). <IMAGE>

Description

Die Erfindung betrifft ein Gerät zur intermittierenden Erzeugung einer Druckwelle in Silos oder anderen Behältern, bei dem ein Rohr zum Ablassen der Druckwellen, ein das Rohr umgebendes Speichergehäuse zur Ansammlung von Druckluft und ein flächiges Dichtelement vorhanden sind, das im geladenen Ruhezustand an dem inneren Ende des Rohres anliegt, auf der dem Rohr abgewandten Seite eine Druckkammer abschließt, auf der einen Seite mit dem Innendruck der Druckkammer und auf der anderen Seite außerhalb des Rohres mit dem Speichergehäusedruck beaufschlagt ist und im Auslösefall durch Entlüften der Druckkammer zur Herstellung einer Verbindung zwischen Speichergehäuse und Rohr von dem Rohrende abhebt, wobei das Speichergehäuse über eine Passage befüllbar ist, die die Druckkammer einschließt.The invention relates to a device for intermittent generation of a pressure wave in silos or other containers, in which a tube for releasing the pressure waves, a storage housing surrounding the tube for the accumulation of compressed air and a flat sealing element are present, which are in the charged, idle state at the inner end of the Tube is present, on the side facing away from the tube a pressure chamber, on one side with the internal pressure of the pressure chamber and on the other side outside of the tube with the pressure of the accumulator housing and in the event of tripping by venting the pressure chamber to establish a connection between the accumulator housing and the tube lifts off from the pipe end, the storage housing being fillable via a passage which encloses the pressure chamber.

Aus der EP-A-0 202 720 ist ein Gerät dieser Art bekannt, bei dem innerhalb eines Stutzens ein Ventilteller verschiebbar ist, der abwechselnd das Rohr zum Ablassen der Druckwellen oder den Ausgang der Druckkammer abdichtet. Zur Befüllung des Speichergehäuses ist ein separater Kanal vorhanden, der mit Hilfe eines gesonderten Ventils bedient wird. Darüber hinaus ist ein derartiges Gerät von der französischen Firma Ermap bekannt, bei dem statt der dichtend in einem Rohrstutzen geführten Scheibe eine Membrane oberhalb des ventilseitigen Rohrendes eingespannt ist, die die Druckkammer abschließt. Zur Vermeidung einer gesonderten Leitung zur Befüllung des Speichergehäuses trägt die Membrane außerhalb der Fläche des Rohres zum Ablassen der Druckwellen eine kalibrierte Bohrung. Die Befüllung geschieht also über die Druckkammer mit Hilfe derselben Öffnung, über die auch die Entlüftung der Druckkammer erfolgt.From EP-A-0 202 720 a device of this type is known, in which a valve plate can be moved within a connecting piece, which alternately seals the tube for releasing the pressure waves or the outlet of the pressure chamber. There is a separate channel for filling the storage housing, which is operated using a separate valve. In addition, such a device is known from the French company Ermap, in which, instead of the washer sealingly guided in a pipe socket, a membrane is clamped above the valve-side pipe end, which closes off the pressure chamber. In order to avoid a separate line for filling the storage housing, the membrane has a calibrated bore outside the surface of the pipe for releasing the pressure waves. Filling takes place via the pressure chamber using the same opening through which the pressure chamber is also vented.

Bei dem Gerät aus französischer Produktion ist ein besonderer Grad an Vereinfachung gelungen, so daß eine relativ einfache Herstellung bei zuverlässiger Funktion möglich ist. Das einzig beanspruchte Teil ist die Membrane, die wegen der hohen Belastung im Falle der Auslösung einer Druckwelle sorgfältig gestaltet und aus hochwertigem Material bestehen muß. Der einzig gravierende Nachteil dieses bekannten Gerätes liegt darin, daß eine Neubefüllung nach der Abgabe einer Druckwelle relativ lange dauert, weil die gesamte Luftmenge durch die kalibrierte Bohrung in der Membrane strömen muß, die aus Gründen einer zuverlässigen Funktion nicht zu groß gewählt werden darf.In the device from French production, a particular degree of simplification has been achieved, so that a relatively simple manufacture with reliable function is possible. The only stressed part is the membrane, which, due to the high load in the event of a pressure wave being triggered, must be carefully designed and made of high-quality material. The only serious disadvantage of this known device is that it takes a relatively long time to refill after the delivery of a pressure wave, because the entire amount of air has to flow through the calibrated bore in the membrane, which must not be too large for reliable operation.

Es ist Aufgabe der Erfindung, ein Gerät dieser Gattung so zu verbessern, daß unter Beibehaltung eines unkomplizierten Aufbaus eine sehr schnelle Befüllung möglich ist, also Druckwellen in kürzesten Abständen abgegeben werden können.It is an object of the invention to improve a device of this type in such a way that very quick filling is possible while maintaining an uncomplicated structure, that is to say pressure waves can be emitted at the shortest possible intervals.

Zur Lösung dieser Aufgabe schlägt die Erfindung vor, daß das flächige Dichtelement eine nichteingespannte Ventilscheibe ist, deren Rand einerseits elastisch genug ist, um bei der Befüllung die Druckluft von der Druckkammer in das Speichergehäuse zu lassen, und andererseits steif genug ist, um die Ventilscheibe zumindest grob zu zentrieren, die druckkammer den Randabschnitt der Ventilscheibe mindestens teilweise ubergreift und die Ventilscheibe in ihrem mittleren Abschnitt eine Versteifung treigt. In der DE-C-24 02 001 wird an einem Gerät der gleichen Gattung eine Kolbendichtung vorgestellt, die in der einen Richtung luftdurchlässig, in der anderen Richtung jedoch abdichtend gestaltet ist. Es bedarf dazu der Verwendung einfacher Dichtungsmanschetten, die aufgrund ihrer im Querschnitt U-förmigen Gestalt von Hause aus und ohne Ausnahme diese Eigenschaft aufweisen. Bei der Erfindung hingegen ist die Ventilscheibe in Abstimmung auf die Druckkammer gestaltet, und zwar in der Weise, daß sie bei der Befüllung die in die Druckkammer eingelassene Druckluft ohne nennenswerten Widerstand in das Speichergehäuse läßt, andererseits jedoch so gut gegenüber der Druckkammer abdichtet, daß sie im Fall der Entlüftung der Druckkammer nach einem Füllvorgang die innere Öffnung des Rohres zum Abgeben der Druckwellen sicher freigibt. Dabei ist es unerheblich, ob der äußere Rand der Ventilscheibe mehr oder weniger dicht an der Kammerwand anliegt, es kommt lediglich darauf an, daß die Einströmung der Druckluft von der Druckkammer in das Speichergehäuse nicht behindert wird und die an dem Rand der Ventilscheibe vorhandenen Undichtigkeiten im Auslösefall nicht zu einer Rückströmung der Druckluft aus dem Speichergehäuse in die Druckkammer führen, sondern zum Abheben der Ventilscheibe vom inneren Ende des Rohres.To achieve this object, the invention proposes that the flat sealing element is a non-clamped valve disc, the edge of which is elastic enough on the one hand to let the compressed air from the pressure chamber into the storage housing during filling, and on the other hand is rigid enough to at least the valve disc center roughly, the pressure chamber at least partially overlaps the edge section of the valve disk and the valve disk tends to stiffen in its central section. In DE-C-24 02 001, a piston seal is presented on a device of the same type, which is designed to be air-permeable in one direction, but sealing in the other direction. This requires the use of simple sealing sleeves, which inherently have this property due to their U-shaped cross section and without exception exhibit. In the invention, however, the valve disc is designed in coordination with the pressure chamber, in such a way that, when it is filled, it leaves the compressed air let into the pressure chamber into the storage housing without any significant resistance, but on the other hand seals it so well against the pressure chamber that it seals in the case of venting the pressure chamber after a filling process, the inner opening of the tube for releasing the pressure waves is safely released. It is irrelevant whether the outer edge of the valve disc lies more or less close to the chamber wall, it is only important that the inflow of compressed air from the pressure chamber into the storage housing is not impeded and the leaks in the edge of the valve disc in Trigger event does not lead to a backflow of the compressed air from the storage housing into the pressure chamber, but to the lifting of the valve disc from the inner end of the tube.

Eine axial begrenzt verschiebbare sowie nichteingespannte Ventilscheibe in Form eines flächigen Dichtelements ist zwar bereits als Sperrelement eines Rückschlagventils bekannt (CH-A-558 492). Aber aufgrund der andersartigen Funktion des Rückschlagventils gegenüber einem Gerät zur Druckwellenerzeugung braucht man für das Rückschlagventil nur eine Ventilscheibe, mit deren Mittelteil die Öffnung des axialen Strömungskanals einer Düse durch Andrücken des Mittelteils der Ventilscheibe an den Öffnungsrand der Düse absperrbar und nach Umkehrung der Strömungsrichtung des Mediums das Durchströmen desselben durch Freigeben der Öffnung erreichbar ist. Zum Durchlassen des Mediums wird die Ventilscheibe axial bis zur Anlage an eine Federscheibe verschoben, und das Medium kann an der Ventilscheibe vorbeiströmen, weil die Ventilscheibe einen geringeren Durchmesser als das umgebende Gehäuse aufweist und so zwischen der Ventilscheibe und der Innenwand des Gehäuses ein ringförmiger Durchströmkanal gebildet wird. Wenn der Strömungskanal der Düse durch die Ventilscheibe verschlossen ist, findet keine Umströmung der Ventilscheibe statt, wie es jedoch für das erfindungsgemäße Gerät zum Füllen des Speichers notwendig ist. Außerdem tritt bei dem bekannten Rückschlagventil keine vergleichbare Strömung des Mediums auf, wie sie sich bei dem erfindungsgemäßen Gerät ergibt, wenn zur Erzeugung einer Druckwelle die Druckluft aus dem Speicher an der Unterseite der Ventilscheibe vorbei durch die innere Öffnung des Rohres hindurch schlagartig nach außen strömt. Hierfür muß bei dem erfindungsgemäßen Gerät der Rand der Ventilscheibe elastisch verformbar sein.An axially displaceable and non-clamped valve disc in the form of a flat sealing element is already known as a blocking element of a check valve (CH-A-558 492). But due to the different function of the check valve compared to a device for generating pressure waves, all that is needed for the check valve is a valve disc, with the central part of which can block the opening of the axial flow channel of a nozzle by pressing the central part of the valve disc against the opening edge of the nozzle and after reversing the direction of flow of the medium the flow through it can be achieved by opening the opening. To allow the medium to pass through, the valve disk is moved axially until it rests against a spring washer, and the medium can flow past the valve disk because the valve disk has a smaller diameter than the surrounding housing and thus an annular flow channel is formed between the valve disk and the inner wall of the housing becomes. When the flow channel of the nozzle is closed by the valve disc, there is no flow around the valve disc, as is necessary for the device according to the invention for filling the accumulator. In addition, no comparable flow of the medium occurs in the known non-return valve, as occurs in the device according to the invention, when the compressed air suddenly flows out of the accumulator past the underside of the valve disc through the inner opening of the tube to the outside to generate a pressure wave. For this purpose, the edge of the valve disk must be elastically deformable in the device according to the invention.

Es hat sich gezeigt, daß eine äußerst weiche Materialqualität für den äußeren Rand der Ventilscheibe gewählt werden kann, der durchaus im ungespannten Zustand einige Welligkeit aufweisen kann. Die Steifigkeit muß jedoch eine gewisse Mindestgröße haben, damit die Ventilscheibe einigermaßen zentriert in dem Gerät angeordnet bleibt, da die Ventilscheibe außer durch den Druckkammerrand oder die Innenwand des Speichergehäuses vorzugsweise ungeführt ist. Falls aus Kostengründen oder aus Gründen der besonders geringen Massen eine sehr elastische Qualität für die Ventilscheibe ausgesucht wird, kann es zweckmäßig sein, die Ventilscheibe mit einer Stützscheibe zu verstärken, die beispielsweise auf der dem Rohrende abgewandten Seite der Ventilscheibe angeordnet ist oder als Kerneinlage in die Ventilscheibe eingelegt ist.It has been shown that an extremely soft material quality can be selected for the outer edge of the valve disc, which may have some ripple in the untensioned state. However, the stiffness must have a certain minimum size so that the valve disc remains somewhat centered in the device, since the valve disc is preferably unguided except through the pressure chamber edge or the inner wall of the storage housing. If a very elastic quality is selected for the valve disc for cost reasons or for reasons of the particularly low masses, it may be expedient to reinforce the valve disc with a support disc which is arranged, for example, on the side of the valve disc facing away from the pipe end or as a core insert in the Valve disc is inserted.

Im Falle der Auslösung wird die Ventilscheibe von dem Rohr abgehoben, so daß sich ein Ringspalt zwischen dem Speichergehäuse und dem Rohr auftut. Durch diesen Ringspalt entweicht das in dem Speichergehäuse vorgespannte Gas schlagartig, so daß die beabsichtigte Druckwelle gerichtet das Rohr verläßt. Der Ringspalt, durch den sich der Inhalt des Speichergehäuses im Auslösefall entleert, sollte schon aus Gründen einer möglichst raschen Entladung so groß gestaltet werden, daß an dieser Stelle nicht die geringste Behinderung eintritt.In the event of tripping, the valve disk is lifted off the tube, so that an annular gap opens between the storage housing and the tube. The prestressed gas in the storage housing suddenly escapes through this annular gap, so that the intended pressure wave leaves the tube in a directed manner. The annular gap through which the contents of the storage housing are emptied in the event of a trigger should, for reasons of rapid discharge as possible, be designed so large that not the slightest disability occurs at this point.

Das Gerät kann in wenigen Sekunden für einen Auslösefall geladen werden, weil die Befüllung an keiner Stelle durch eine Verengung oder dgl. behindert ist. Aufgrund der schnellen Befüllbarkeit kann oftmals die Anzahl der für die Entleerung eines Silos benötigten Geräte reduziert werden. Voraussetzung ist selbstverständlich eine entsprechend üppige Luftförderung zur schnellen Befüllung des Gerätes.The device can be charged for a triggering event in a few seconds because the filling is not hindered by a restriction or the like at any point. Due to the quick fillability, the number of devices required for emptying a silo can often be reduced. A prerequisite is, of course, a correspondingly generous air flow for quick filling of the device.

Es hat sich gezeigt, daß die Ventilscheibe nur ungefähr in ihrer Lage gehalten werden muß, um sie im wesentlichen zentriert zu halten. Dadurch ist die Herstellung noch weiter vereinfacht, weil als Ventilscheiben aus Meterware ausgestanzte Ronden eingesetzt werden können. Eine sehr genaue zentrische Zuordnung der Druckkammer zu dem Rohr ist nicht erforderlich, da es hierauf nicht ankommt. Auch ohne zentrische Lage kommt es zu der gewünschten Abdichtung an den jeweiligen Stellen, so daß wiederum äußerst geringe Anforderungen an die Prazision des Gerätes gestellt werden müssen. Das verbilligt die Herstellung.It has been found that the valve disk only has to be held approximately in its position in order to keep it essentially centered. This simplifies the production even further, because blanks punched out of meter goods can be used as valve disks. A very precise central assignment of the pressure chamber to the pipe is not necessary, since this is not important. Even without a central position, there is the desired sealing at the respective points, so that again extremely low requirements must be placed on the precision of the device. This makes the manufacture cheaper.

Es versteht sich von selbst, daß die Ventilscheibe steif genug sein muß, um den Differenzdruck zwischen Druckkammer und Rohr im geladenen Ruhezustand ohne nennenswerte Verformung aushalten zu können. Hierfür ist die Ventilscheibe in ihrem mittleren Abschnitt mit einer Verstärkung versehen, die aus Gründen einer geringen Trägheit leichtgewichtig ausfallen sollte. Unterhalb einer derartigen Stützscheibe wirkt dann die Ventilscheibe als reine Dichtung, die im geladenen Zustand des Gerätes zwischen der Stützscheibe und dem inneren Rohrende für eine Abdichtung sorgt. Im einfachsten Fall wird die Stützscheibe mit einem zentralen Niet an der Ventilscheibe befestigt. Die Stützscheibe besteht z.B. aus einer kreisförmigen Aluminiumplatte.It goes without saying that the valve disc must be stiff enough to be able to withstand the differential pressure between the pressure chamber and the pipe in the charged idle state without any significant deformation. For this purpose, the valve disk is provided with a reinforcement in its middle section, which should be light-weight for reasons of low inertia. Below such a support disc, the valve disc then acts as a pure seal, which provides a seal between the support disc and the inner tube end when the device is loaded. In the simplest case, the support disk is attached to the valve disk with a central rivet. The support disc consists, for example, of a circular aluminum plate.

Es kommt immer wieder vor, daß Geräte gemäß der Erfindung an Behältern und Leitungen eingesetzt werden, die starken Temperaturen ausgesetzt sind. Es ist dann zweckmäßig, die Ventilscheibe aus einer dünnen, flexiblen Metallscheibe zu bilden, wobei dann die Abdichtung durch einen temperaturbeständigen Ring aus Kunststoff, Kork oder sogar aus Aluminium bewirkt wird, der an der Metallplatte befestigt ist und zum inneren Ende des Rohres weist.It happens again and again that devices according to the invention are used on containers and lines that are exposed to high temperatures. It is then expedient to form the valve disk from a thin, flexible metal disk, the sealing then being effected by a temperature-resistant ring made of plastic, cork or even aluminum, which is fastened to the metal plate and points towards the inner end of the tube.

Nachfolgend werden Ausführungsbeispiele der Erfindung, die in der Zeichnung dargestellt sind, näher erläutert; in der Zeichnung zeigen:

  • Figur 1 eine schematische Querschnittsansicht durch ein erstes Ausführungsbeispiel eines Gerätes gemäß der Erfindung in Rohrausführung,
  • Figur 2 eine Querschnittsansicht durch den oberen Teil eines Gerätes in einem weiteren Ausführungsbeispiel,
  • Figur 3 eine Ansicht gemäß Figur 2 eines weiteren Ausführungsbeispiels,
  • Figur 4 eine herausgezeichnete Ansicht einer Ventilplatte mit einer Verstärkungsplatte,
  • Figur 5 eine Ansicht gemäß der Figur 4 mit einer eingelegten Stützplatte und
  • Figur 6 eine Querschnittsansicht eines Teils eines weiteren Ausführungsbeispiels der Erfindung.
Exemplary embodiments of the invention which are illustrated in the drawing are explained in more detail below; show in the drawing:
  • FIG. 1 shows a schematic cross-sectional view through a first exemplary embodiment of a device according to the invention in tubular design,
  • FIG. 2 shows a cross-sectional view through the upper part of a device in a further exemplary embodiment,
  • FIG. 3 shows a view according to FIG. 2 of a further exemplary embodiment,
  • FIG. 4 shows a drawn-out view of a valve plate with a reinforcing plate,
  • Figure 5 is a view according to Figure 4 with an inserted support plate and
  • Figure 6 is a cross-sectional view of part of another embodiment of the invention.

Das in der Figur 1 dargestellte Ausführungsbeispiel eines Gerätes gemäß der Erfindung besteht aus einem rohrartig geformten Speichergehäuse 1, das an seinen beiden Enden mit einem unteren Deckel 2 bzw. einem oberen Deckel 3 mit Hilfe üblicher Schraubverbindungen geschlossen ist. In den unteren Deckel 2 ist ein Rohr 5 eingeschweißt, während sich in dem oberen Deckel 3 eine Öffnung 4 befindet. Sie dient zur Aufnahme eines Ventils oder einer Leitung, an deren Ende sich ein Ventil befindet, mit dessen Hilfe an dieser Stelle eine Befüllung mit Druckluft oder eine schnelle Entlüftung möglich ist. Das Rohr 5 dient zum Ablassen von Druckwellen, die wiederum zum Lösen von rieselfähigem Gut in Silos oder sonstigen Behältern eingesetzt werden, die zur Brückenbildung, zum Ankleben neigen oder aus anderen Gründen schwer rieselfähig sind.The embodiment shown in Figure 1 of a device according to the invention consists of a tubular storage housing 1, which is closed at both ends with a lower cover 2 and an upper cover 3 with the aid of conventional screw connections. A tube 5 is welded into the lower cover 2, while there is an opening 4 in the upper cover 3. It is used to hold a valve or a line, at the end of which there is a valve, with the help of which filling with compressed air or quick ventilation is possible at this point. The tube 5 is used for releasing pressure waves, which in turn are used to loosen free-flowing material in silos or other containers which tend to form bridges, stick or are difficult to free-flow for other reasons.

Unterhalb des oberen Deckels 3 ist mit Hilfe eines Druckkammergehäuses 6 eine Druckkammer 7 gebildet, die an ihrer unteren Seite mit Hilfe einer Ventilscheibe 10 abgeschlossen ist. Die Wandung 8 der Druckkammer 7 ist glattflächig ohne schroffe Übergänge, weil sie als Stützfläche für die Ventilscheibe 10 bei der Abgabe von Druckwellen dient.A pressure chamber 7 is formed below the upper cover 3 with the aid of a pressure chamber housing 6 and is closed on its lower side by means of a valve disk 10. The wall 8 of the pressure chamber 7 is smooth with no jagged transitions because it serves as a support surface for the valve disc 10 when pressure waves are emitted.

Die in den Figuren der Zeichnung wiedergegebenen Ausführungsbeispiele sind an vorgegebenen Stellen an Trichtern oder an der Innenwand von Vorratsbehältern oder Silos in einfacher oder mehrfacher Anzahl vorhanden und vermögen einen heftigen Druckstrahl in Form einer Druckwelle auszusenden, die auf rieselfähiges Schüttgut lösende Wirkung ausübt. Zur Abgabe einer derartigen Druckwelle bedarf es folgender Bedienung des Gerätes: Über das bereits genannte Ventil wird Druckluft in die Druckkammer 7 eingelassen, die die leicht elastische Ventilscheibe 10 an der Kontaktstelle mit dem Druckkammergehäuse 6 zur Freigabe eines Durchlaßspaltes nach unten drängt. Auf diese Weise füllt sich das Speichergehäuse 1 mit Druckluft, wobei die Ventilscheibe 10 wegen des fehlenden Gegendruckes innerhalb des Rohres 5 mit zunehmender Kraft dichtend auf das innere Ende des Rohres 5 gepreßt wird. Nach dem Befüllen kehrt die Ventilscheibe 10 in ihre dargestellte Ausgangslage zurück, in der sie mit ihrem Rand mehr oder weniger locker an dem Druckkammergehäuse 6 anliegt. Bei dieser Kontaktstelle können sogar Restspalte oder kleine Öffnungen vorhanden sein, es kommt lediglich darauf an, daß in der Berührzone keine zu großen Öffnungen vorhanden sind.The exemplary embodiments shown in the figures of the drawing are present in single or multiple numbers at predetermined locations on funnels or on the inner wall of storage containers or silos and can emit a violent pressure jet in the form of a pressure wave, which has a dissolving effect on free-flowing bulk material. In order to emit such a pressure wave, the following operation of the device is required: Compressed air is admitted into the pressure chamber 7 via the valve already mentioned, which presses the slightly elastic valve disk 10 at the contact point with the pressure chamber housing 6 to release a passage gap. In this way, the storage housing 1 fills with compressed air, the valve disc 10 being pressed onto the inner end of the tube 5 in a sealing manner with increasing force due to the lack of counterpressure within the tube 5. After filling, the valve disk 10 returns to the starting position shown, in which its edge lies more or less loosely on the pressure chamber housing 6. At this contact point, there may even be residual gaps or small openings; the only thing that matters is that there are no openings that are too large in the contact zone.

Wenn eine Druckwelle das Gerät verlassen soll, wird über das genannte Ventil die Druckkammer 7 schlagartig entlüftet. Aufgrund des fehlenden Gegendruckes wird die Ventilscheibe von dem in dem Speichergehäuse 1 anstehenden Luftdruck auf die Druckkammerwandung 8 zu bewegt, wobei selbstverständlich der mittlere Abschnitt der Ventilscheibe 10 vom inneren Ende des Rohres 5 abgehoben wird. Die in dem Speichergehäuse 1 angesammelte Luft verläßt nun über den mit "s" markierten Ringspalt das Gerät über das Rohr 5 in gerichtetem Strahl. Dabei nimmt die Ventilscheibe die gestrichelt wiedergegebene Form an. Nach dem Ablassen der Druckwelle kehrt die Ventilscheibe 10 aufgrund der ihr eigenen Elastizität und Formstabilität in die ausgezogen dargestellte Ausgangslage zurück. Damit ist der Vorgang abgeschlossen.If a pressure wave is to leave the device, the pressure chamber 7 is suddenly vented via said valve. Due to the lack of back pressure, the valve disc is moved towards the pressure chamber wall 8 by the air pressure present in the storage housing 1, the central portion of the valve disc 10 being naturally lifted off the inner end of the tube 5. The accumulated in the storage case 1 Air now leaves the device via the pipe 5 in a directed jet via the annular gap marked with "s". The valve disc assumes the shape shown in dashed lines. After the pressure wave has been released, the valve disk 10 returns to the starting position shown in solid lines on account of its own elasticity and dimensional stability. The process is now complete.

Die Fläche des Ringspaltes "s" sollte so gewählt werden, daß sie in etwa der Querschnittsfläche des Rohres 5 entspricht. Dadurch entsteht an dieser Stelle so gut wie kein Stau, was einer schnellen Entleerung des Speichergehäuses 1 durch das Rohr 5 förderlich ist. Im übrigen sorgt die Leichtgewichtigkeit der Ventilscheibe 10 für eine besonders schlagartige Freigabe des inneren Endes des Rohres 5 im Auslösefall, was zu hervorragenden Ergebnissen führt. Zum einen ist die das Gerät verlassende Druckwelle sehr stark, zum anderen ist die Reichweite beträchtlich.The area of the annular gap "s" should be chosen so that it corresponds approximately to the cross-sectional area of the tube 5. As a result, there is virtually no traffic jam at this point, which is conducive to rapid emptying of the storage housing 1 through the pipe 5. In addition, the light weight of the valve disc 10 ensures a particularly sudden release of the inner end of the tube 5 when triggered, which leads to excellent results. On the one hand, the pressure wave leaving the device is very strong, on the other hand, the range is considerable.

Bei den dargestellten Ausführungsbeispielen sind das Speichergehäuse 1, das Rohr 5 und die Ventilscheibe 10 kreisförmig ausgebildet und konzentrisch zueinander angeordnet. Das ist jedoch nicht Bedingung. Es kommen ebenso rechteckige oder quadratische Formen in Frage, wenn entsprechende Einbauverhältnisse oder dgl. nach diesen Formen verlangen. Unabhängig von der jeweiligen Gestaltung ist ersichtlich, daß die Ventilscheibe 10 so gut wie keinen Beanspruchungen unterworfen ist, wenn man einmal von der Anpressung an das Ende des Rohres im geladenen Ruhezustand und von der leichten Durchbiegung während der Entleerung des Speichergehäuses 1 absieht. Es können deshalb billigste Werkstoffe und einfachste Ausführungen bevorzugt werden, so daß sich günstige Herstellungskosten ergeben.In the illustrated exemplary embodiments, the storage housing 1, the tube 5 and the valve disk 10 are circular and are arranged concentrically to one another. However, this is not a requirement. Rectangular or square shapes are also possible if appropriate installation conditions or the like call for these shapes. Regardless of the particular design, it can be seen that the valve disc 10 is subjected to practically no stresses, if one disregards the pressure on the end of the tube in the loaded idle state and the slight deflection during emptying of the storage housing 1. Cheapest materials and simplest designs can therefore be preferred so that result in favorable manufacturing costs.

Bei den Ausführungsbeispielen gemäß den Figuren 2, 3 und 6 ist die Ventilscheibe 10 auf ihrer der Druckkammer 7 zugewandten Seite mit einer Stützscheibe 11 versehen, die mit Hilfe eines Klipp 20 befestigt ist. Zusätzlich kann eine bauchige Scheibe 21 vorgesehen sein, um das Abgleiten der Ventilscheibe 10 von dem Klipp 20 zu verhindern. Bei diesem Ausführungsbeispiel wird die Ventilscheibe 10 zusammen mit der Stützscheibe 11 durch das Speichergehäuse 1 zentriert, das als Schweißkonsturktion unter Einschluß eines Rohres und von Flanschen hergestellt ist. Die Druckkammer 7 wird durch ein Druckkammergehäuse 6 begrenzt, das aus einem innen konischen Ring mit einer Schräge 15 besteht. Im übrigen ist die Funktion so, wie vorangehend beschrieben worden ist, wobei jedoch die Ventilscheibe 10 mit der Stützscheibe 11 eine Einheit bildet, die im Auslösefall vom inneren Ende des Rohres 5 abgehoben wird.In the exemplary embodiments according to FIGS. 2, 3 and 6, the valve disk 10 is provided on its side facing the pressure chamber 7 with a support disk 11 which is fastened with the aid of a clip 20. In addition, a bulbous disk 21 can be provided to prevent the valve disk 10 from sliding off the clip 20. In this exemplary embodiment, the valve disk 10 is centered together with the support disk 11 by the storage housing 1, which is produced as a welded construction including a tube and flanges. The pressure chamber 7 is delimited by a pressure chamber housing 6, which consists of an internally conical ring with a bevel 15. Otherwise, the function is as described above, but the valve disk 10 forms a unit with the support disk 11, which is raised from the inner end of the tube 5 when triggered.

Das in der Figur 3 wiedergegebene Ausführungsbeispiel unterscheidet sich von den vorangehend beschriebenen in erster Linie dadurch, daß das Druckkammergehäuse 6 als einfacher Ring ausgebildet ist. Im Auslösefall trifft die Stützscheibe 11 auf den Deckel 3 des Speichergehäuses 1 auf, was nicht weiter stört. Die elastische Ventilscheibe 10 legt sich im Auslösefall an die Innenseite des als Ring ausgebildeten Kammergehäuses 6 an und kehrt bei der Befüllung in den in der Figur 3 wiedergegebenen Zustand zurück.The exemplary embodiment shown in FIG. 3 differs from the ones described above primarily in that the pressure chamber housing 6 is designed as a simple ring. In the event of tripping, the support disk 11 strikes the cover 3 of the storage housing 1, which does not further bother. When triggered, the elastic valve disk 10 rests against the inside of the chamber housing 6, which is designed as a ring, and returns to the state shown in FIG. 3 when it is filled.

In der Figur 4 ist zur Verdeutlichung die Ventilscheibe 10 und die Stützscheibe 11, verbunden durch einen Klipp 20 mit bauchiger Scheibe 21 dargestellt, um Details genauer erkennen zu können. Bei dem in der Figur 5 dargestellten Ausführungsbeispiel ist die Stützscheibe 11 vollkommen eingeschlossen, also durch das elastische Material der Ventilscheibe 10 auch auf der der Druckkammer zugewandten Seite abgedeckt. Dadurch eignet sich dieses Ausführungsbeispiel insbesondere für Druckkammern 7, die vollkommen in sich eben sind. Der Anprall im Auslösefall wird dadurch gut abgedämpft.In FIG. 4, the valve disk 10 and the support disk 11 are shown for clarification, connected by a clip 20 with a bulbous disk 21, in order to be able to recognize details more precisely. In the case of FIG illustrated embodiment, the support plate 11 is completely enclosed, that is covered by the elastic material of the valve plate 10 also on the side facing the pressure chamber. As a result, this exemplary embodiment is particularly suitable for pressure chambers 7 which are completely flat in themselves. The impact in the event of a trigger is well dampened.

Das in der Figur 6 wiedergegebene Ausführungsbeispiel unterscheidet sich insofern von den vorangehend beschriebenen Ausführungsbeispielen, als die Ventilscheibe 10 auf der der Druckkammer 7 abgewandten Seite mit Hilfe eines Stützringes 22 gehalten ist. Der Stützring 22 ist an dem Speichergehäuse 1 angeschweißt und trägt in Abständen Öffnungen 23, die beim Befüllen die Luft in der Speichergehäuse 1 hindurchlassen. Ggfs. beult sich die Ventilscheibe 10 unter dem Druck beim Befüllen zwischen dem Rohr 5 und der Innenseite des Ringes 22 leicht durch, so daß der äußere Rand der Ventilscheibe 10 leicht nach innen gezogen wird. Dadurch werden die Öffnungen 23 freigegeben.The exemplary embodiment shown in FIG. 6 differs from the exemplary embodiments described above in that the valve disk 10 is held on the side facing away from the pressure chamber 7 with the aid of a support ring 22. The support ring 22 is welded to the storage housing 1 and bears openings 23 at intervals which let the air in the storage housing 1 pass when it is filled. If necessary. the valve disk 10 bulges slightly under pressure when filling between the tube 5 and the inside of the ring 22, so that the outer edge of the valve disk 10 is slightly pulled inwards. This opens the openings 23.

Nach dem Befüllen nimmt die Ventilscheibe 10, die aus einer sehr elastischen Qualität bestehen kann, wieder die in der Figur 6 wiedergegebene Lage ein. Dasselbe trifft nach einem Abschuß zu, während dessen die Ventilscheibe 10 von dem Rohr 5 abgehoben ist. Auch bei diesem Abheben wird der äußere Rand der Ventilscheibe 10 leicht nach innen gezogen, er bleibt jedoch im Bereich des Stützringes 23, so daß die Beibehaltung seiner Lage gewährleistet ist. Im übrigen ist in der Figur 6 noch eine Modifikation der Befestigung der Stützscheibe 11 an der Ventilscheibe 10 zu erkennen, wodurch in erster Linie angedeutet ist, daß an dieser Stelle alle möglichen Befestigungen in Frage kommen.After filling, the valve disc 10, which can be made of a very elastic quality, takes up the position shown in FIG. 6 again. The same applies after a shot, during which the valve disk 10 is lifted off the tube 5. During this lifting, too, the outer edge of the valve disk 10 is pulled slightly inward, but it remains in the region of the support ring 23, so that its position is maintained. In addition, a modification of the attachment of the support disk 11 to the valve disk 10 can be seen in FIG. 6, which primarily indicates that all possible attachments can be considered at this point.

Die vorgestellten Geräte werden in der Regel nur bei Bedarf eingesetzt, weil sie einen relativ hohen Luftverbrauch haben und komprimierte Luft relativ teuer ist. Ein weiterer Vorteil des Gerätes besteht darin, daß im Ruhezustand die Ventilscheibe 10 das Rohr 5 abschließt, so daß in dem entsprechenden Silobehälter befindliche Stäube nicht in das Gerät eindringen können. Eine Ablagerung innerhalb des Rohres 5 ist unschädlich und nicht von langer Dauer; spätestens beim Ablassen der nächsten Druckwelle werden diese Ablagerungen ausgeblasen.The devices presented are generally only used when necessary because they have a relatively high air consumption and compressed air is relatively expensive. Another advantage of the device is that the valve disc 10 closes the tube 5 in the idle state, so that dusts located in the corresponding silo container cannot penetrate the device. A deposit within the tube 5 is harmless and does not last long; At the latest when the next pressure wave is released, these deposits are blown out.

Claims (11)

  1. Apparatus for intermittently generating a pressure wave in silos or other containers,
    - in which there is provided a pipe (5) for discharging the pressure waves,
    - a reservoir housing (1) surrounding the pipe (5) for collecting compressed air and
    - a flat sealing element (10) which in the charged quiescent condition rests against the inner end of the pipe (5),
    - in which the side facing away from the pipe (5) is closed off by pressure chamber (7),
    - one side being subjected to the internal pressure of the pressure chamber (7) and
    - the other side outside the pipe (5) is subjected to the pressure existing inside the reservoir housing (1) and
    - in the case of release, through the removal of the air from the pressure chamber, lifts off the pipe end for producing a connection between reservoir housing (1) and the pipe (5),
    - wherein the reservoir housing (1) can be charged via a passage,
    - which includes the pressure chamber (7),
    - characterised in that
    - the flat sealing element is a stress-free valve disc (10),
    - whose edge on the one hand is sufficiently elastic in order during charging to allow the compressed air to flow from the pressure chamber (7) into the reservoir housing (1), and
    - on the other hand is sufficiently stiff in order to center the valve disc (10) at least approximately,
    - that the pressure chamber (7) at least partly overlaps the edge region of the valve disc (10) and
    - the valve disc (10) carries a stiffening in its central section.
  2. Apparatus according to claim 1, characterised in that the stiffening of the valve disc (10) overlaps the inner end of the pipe (5).
  3. Apparatus according to claim 1 or 2, characterised in that the stiffening is constructed as a separate supporting plate (11) which is arranged on the side of the valve disc (10) facing away from the pipe (5) and is fixed to the same.
  4. Apparatus according to claim 3, characterised in that the supporting plate (11) consists of plastics or light metal.
  5. Apparatus according to claim 3 or 4, characterised in that the supporting plate edge facing the pressure chamber (7) is bevelled or matched to the contour of the pressure chamber (7).
  6. Apparatus according to one of the preceding claims, characterised in that the valve disc (10) consists of plastics or rubber.
  7. Apparatus according to claim 6, characterised in that the valve disc (10) carries a fabric insert.
  8. Apparatus according to one of the claims 1 to 4, characterised in that the valve disc (10) consists of a core plate of steel, aluminium or a hard plastics with a polymer coating.
  9. Apparatus according to one of the preceding claims, characterised in that the cleavage surface between pipe end and valve disc (10) during the discharge of a pressure wave is at least twice as large as the cross-sectional area of the pipe (5).
  10. Apparatus according to one of the preceding claims, characterised in that the valve disc (10) consists of a thin, flexible metal plate and that for sealing in the area of the pipe (5) there is provided a temperature-resistant sealing ring of plastics, cork or light metal.
  11. Apparatus according to one of the preceding claims, characterised in that
    - on the side facing away from the pressure chamber (7) the outer edge of the valve disc (10) is held with the aid of a supporting ring (22) between this and the bottom edge of the pressure chamber (7) in such a way
    - that under the pressure during charging the valve disc (10) bulges slightly between the pipe (5) and the inner side of the ring (22), so that the outer edge of the valve disc (10) is drawn slightly inwards ,
    - and during lift-off the outer edge of the valve disc (10) is drawn slightly inwards, but remains within the region of the supporting ring (23), so that the retention of its position is ensured.
EP90119210A 1989-10-20 1990-10-06 Apparatus for production of a pressure wave Expired - Lifetime EP0423572B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3934988 1989-10-20
DE3934988A DE3934988A1 (en) 1989-10-20 1989-10-20 DEVICE FOR PRODUCING A PRESSURE SHAFT

Publications (2)

Publication Number Publication Date
EP0423572A1 EP0423572A1 (en) 1991-04-24
EP0423572B1 true EP0423572B1 (en) 1994-07-27

Family

ID=6391855

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90119210A Expired - Lifetime EP0423572B1 (en) 1989-10-20 1990-10-06 Apparatus for production of a pressure wave

Country Status (8)

Country Link
EP (1) EP0423572B1 (en)
JP (1) JPH03148487A (en)
CN (1) CN1024776C (en)
AT (1) ATE109102T1 (en)
AU (1) AU625447B2 (en)
DE (2) DE3934988A1 (en)
NO (1) NO904516L (en)
ZA (1) ZA908383B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4415041C2 (en) * 1994-04-29 1996-07-18 Euba Antriebstechnik Eller Gmb Device for generating a pressure wave
ITBG20050019A1 (en) 2005-05-10 2006-11-11 Larix Srl SHOT VALVE
ITMI20061406A1 (en) 2006-07-20 2008-01-21 Larix Srl SHOT VALVE AT FINE ADJUSTMENT

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788527A (en) * 1973-01-22 1974-01-29 Martin Eng Co Quick-release aerator for introducing high pressure air into a container to facilitate dispensing
CH558492A (en) * 1973-12-01 1975-01-31 Luetolf Markus Nonreturn valve for gases and liquids - has rubber plate trapped between housing sleeve and flow nozzle
US3915339A (en) * 1974-07-08 1975-10-28 Matson C G Quick-release aerator for introducing high pressure air into a container to facilitate dispensing
US4046011A (en) * 1976-06-29 1977-09-06 Olsen Donald W One-way valve for fluid sampler device
NL8501483A (en) * 1985-05-24 1986-12-16 Tech Bureau Knol B V AIR IMPACT DEVICE.

Also Published As

Publication number Publication date
NO904516D0 (en) 1990-10-18
JPH03148487A (en) 1991-06-25
NO904516L (en) 1991-04-22
EP0423572A1 (en) 1991-04-24
AU625447B2 (en) 1992-07-09
DE59006577D1 (en) 1994-09-01
ZA908383B (en) 1991-08-28
CN1051022A (en) 1991-05-01
AU6399990A (en) 1991-04-26
DE3934988A1 (en) 1991-04-25
CN1024776C (en) 1994-06-01
ATE109102T1 (en) 1994-08-15

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