EP0369144B1 - Centrifugal pump for pumping molten masses, especially molten explosives - Google Patents

Centrifugal pump for pumping molten masses, especially molten explosives Download PDF

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Publication number
EP0369144B1
EP0369144B1 EP89118161A EP89118161A EP0369144B1 EP 0369144 B1 EP0369144 B1 EP 0369144B1 EP 89118161 A EP89118161 A EP 89118161A EP 89118161 A EP89118161 A EP 89118161A EP 0369144 B1 EP0369144 B1 EP 0369144B1
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EP
European Patent Office
Prior art keywords
pump
impeller
centrifugal pump
explosive
molten
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
Application number
EP89118161A
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German (de)
French (fr)
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EP0369144A2 (en
EP0369144A3 (en
Inventor
Helmut Dipl.-Ing. Korthäuer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Josef Meissner GmbH and Co KG
Original Assignee
Josef Meissner GmbH and Co KG
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Publication date
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Priority to AT89118161T priority Critical patent/ATE97468T1/en
Publication of EP0369144A2 publication Critical patent/EP0369144A2/en
Publication of EP0369144A3 publication Critical patent/EP0369144A3/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033—Shaping the mixture
    • C06B21/005—By a process involving melting at least part of the ingredients
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2238—Special flow patterns
    • F04D29/2244—Free vortex
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous

Definitions

  • the invention relates to a centrifugal pump for the conveyance of explosive melts, in particular those with a high solid content of non-meltable high-energy explosives.
  • the invention makes it its task to simplify and reduce the cost of producing cast explosive charges for artillery ammunition, rocket warheads, mines, bombs, etc. from high-quality explosive melts with a high proportion of non-meltable, high-energy explosives, such as, for example, hexogen and octogen.
  • the centrifugal pump according to the invention With a free-flow impeller known per se, but with its open delivery blades pointing upwards and arranged outside the flow, which forms a lateral annular gap with the pump housing and a free space located below the impeller, which extends from below to above obliquely radially outward impeller bores are connected to the delivery space or the impeller blade spaces, a gentle conveying of the melt is advantageously ensured, while at the same time ensuring that neither the grain size of the solid particles in the melt is changed by shear forces nor the grain distribution in the melt .
  • annular gap in connection with the impeller bores ensures that an annular vortex-shaped flow of the melt occurs over the entire circumference of the impeller, which ensures that the free space underneath the impeller is flowed through uniformly and constantly so strongly that no sedimentation of solid particles can be done.
  • the constant strong flow through the annular gap between the free-flow impeller and the pump housing moreover advantageously ensures hydrodynamic centering of the impeller and pump shaft.
  • the annular gap and the impeller bores are of course always dimensioned so that the largest solid particles present in the melt can pass unhindered.
  • the process steps can be shifted to a few or even to a single level, which results has that only correspondingly lower buildings and protective walls are required, so that the effort for buildings and protective walls is considerably reduced and at the same time the accessibility of the individual parts of the entire system is improved.
  • the vertically arranged pump shaft 1 is rotatably mounted in the bearing housing 2 in a known manner in the roller bearings 2a and is fixed in the axial direction.
  • the drive takes place in a manner known per se via the clutch 3 through the motor 4, which are preferably designed as an elastic coupling and a speed-adjustable hydrostatic axial piston motor.
  • the free-flow impeller 5 is attached to the lower end of the pump shaft 1. If the centrifugal pump is used to convey explosive melts, the impeller 5 is welded to the shaft 1 in accordance with the relevant regulations, since components which run in explosive or explosive melts must not have any detachable connections.
  • the impeller 5 is provided with the open conveyor blades 5a pointing upwards. According to FIG. 3, eight conveyor blades are provided, but a different number of blades could of course also be implemented.
  • the guide tube 6 which is designed as a heated double-walled tube and is closed by means of the rings 22 and 23 at the upper and lower ends, is connected by means of screw connections. Connections for the supply and return of the heating medium, for example hot water, are provided in the upper closure plate 22, but these are not to be described in more detail here. Of course, suitable means known per se ensure that the heating medium is always at the desired and required temperature.
  • the guide tube 6 At its lower end is the guide tube 6 with the guide ring 7 and immediately Above this with the openings 8 for the supply of the medium into the delivery chamber 9 located above the impeller 5.
  • the pump housing 10 is designed in the usual way as a spiral housing, but it could also have a circular shape, especially if you can be satisfied with a lower efficiency of the centrifugal pump and / or if you want to promote melt with relatively coarse solid particles.
  • the pump housing 10 is connected to the completely heated double-walled pump bowl 11, preferably welded.
  • the cylindrical shape of the pump bowl 11 shown is chosen only for the sake of the simplified schematic representation, of course the pump bowl 11 can be designed differently in many ways and in particular have the shapes well known in boilers.
  • the known and customary media, in particular hot water, are again suitable as heating medium for the pump pot 11.
  • known and customary devices (not shown) ensure that the desired or required operating temperature is maintained as precisely as possible by means of a correspondingly regulated inlet and outlet, that is to say a correspondingly controlled passage of the medium.
  • the guide tube 6 with bearing housing 2 and built-in pump shaft 1 with free-flow impeller 5 are inserted into the pump bowl 11 from above and connected to it by screwing, the pump shaft 1 being passed through the cover and closure plate 27 with play while leaving the annular gap 26.
  • the entire device, completed by the coupling 3 and the drive motor 4, is supported in a position which is not shown but is known and customary by means of suitable frame components and is held in position.
  • the inlet connection 12 with the shut-off valve 12a through the pump bowl 11 is for the inlet of the pumped medium and for the outlet of the pumped medium from the pump immediately above the impeller 5, which in turn is through the pump bowl 11 pressure pipe 13 passed therethrough with a flanged drain line 13a.
  • the space 16 formed underneath the disk-shaped part 5b of the impeller 5 between the impeller 5 and the pump housing 10 is via the annular gap 17 between the impeller 5 and the pump housing 10 and the bores 18 in the impeller part 5b with the delivery chamber 9 which are directed radially outwards from bottom to top Pump connected.
  • the width of the annular gap 17 and the clear overall cross-section of the bores 18 arranged centrally between the conveying blades 5a according to FIG. 3 are coordinated with one another and the direction of the bores 18 is also selected such that there is one on the entire circumference of the impeller 5 during operation uniform and strong annular flow in the bores 18 from bottom to top and in the annular gap 17 from top to bottom, which prevents sedimentation of solid particles in the melt.
  • the flow through the annular gap 17 between the impeller 5 and the adjacent in the Pump housing 10 arranged guide ring 19 also ensures hydrodynamic centering of impeller 5 and pump shaft 1.
  • the overall cross section of the impeller bores is advantageously made at least the same size as the cross section of the annular gap between the impeller and the pump housing in order to influence the formation of the annular vortex-shaped flow of the delivery medium in a suitable manner.
  • the conveying of pumped medium through the impeller bores can also be influenced in that the inclination of the axes of the impeller bores with respect to the pump shaft axis is selected to be relatively large, so that the entry into the bores on the underside of the impeller and the exit from the bores on the top of the impeller are more or less are less far apart.
  • the delivery rate through the bores can be changed within certain limits, on the other hand, this enables the cross-section of the individual impeller bores to be influenced to a corresponding extent without thereby impairing the formation of the desired and required annular vortex flow of the delivery medium.
  • impeller bores i.e.
  • the decisive factor is not the number of impeller bores, but their total cross-section, taking into account their direction.
  • each with an impeller bore arranged centrally between adjacent impeller blades the same overall cross section of the bores could also be realized by a different number of impeller bores.
  • the closure cover 20 is arranged, which carries the heated membrane shut-off valve 21 centrally, which allows total emptying of the pump at a standstill, as may be required if a longer interruption of the delivery or a product change is to take place.
  • the product space is connected via the nozzle 14 to a suction and exhaust gas cleaning device, not shown, for example an explosive -Melting and casting plant, connected.
  • a suction and exhaust gas cleaning device not shown, for example an explosive -Melting and casting plant.
  • the resultant negative pressure ensures that the passage of the pump shaft 1 is constantly ventilated through the annular gap 26 and thus no toxic gases or vapors can escape through the annular gap 26 into the environment.
  • This negative pressure also causes a safe discharge of the gases released as a result of the formation of the pump with the supply of the medium to the impeller 5 from above and the formation of the impeller 5 with upwardly open delivery blades 5a, which automatically or automatically causes degassing of the medium.
  • the connector 14 is used here at the same time as a return for the heating medium supplied to the pump bowl 11 via the connector 25 at its lower end due to the double-walled design in connection with the connector 24.
  • the connector 14 is used here at the same time as a return for the heating medium supplied to the pump bowl 11 via the connector 25 at its lower end due to the double-walled design in connection with the connector 24.
  • other suitable constructive solutions are also possible.
  • the delivery line 13a is connected to the product space 28 via the return pipe 15 with shut-off device 15a. This makes it possible, in the event of a brief interruption in the delivery, to first close the inlet fitting 12a to the pump bowl 11 and then, when the delivery medium in the pump bowl 11 has reached a minimum level, to connect the delivery line 13a and the return pipe 15 to be opened by means of the shut-off device 15a. As a result, the contents of the delivery line 13a are subsequently emptied into the pump bowl 11 or the product space 28 and circulated there further, thereby reliably preventing line clogging and sedimentation of solid particles in the delivery medium. The then empty transport line also prevents an explosion transmission in the event of an event.
  • this can be done automatically in connection with a level control, not shown, in the pump bowl by a signal given by the latter, for example, if a predetermined minimum fill level is undershot, by first closing the inlet fitting 12a and then the Opening the return valve 15 is effected. The opposite can also take place if the predetermined minimum fill level in the pump bowl 11 is reached or exceeded again.
  • the pump can only be started when a predetermined minimum fill level is present.
  • Corresponding signals can also be automatically processed here in a known manner and with known means.
  • a centrifugal pump described above and which can be modified in many ways can, in particular, between individual, several or even all process steps in the production of cast loads be provided from explosive melts.
  • the inlet connection 12 with shut-off valve 12a can be connected to a melting tank (not shown) and the delivery line 13a can be connected to the subsequent mixing tank, also not shown, and / or, for example, to a conditioning tank, again not shown, and a subsequent boiler, likewise not shown, for keeping the melt ready for casting be, wherein the centrifugal pump or centrifugal pumps are operated in the manner required in each case.

Abstract

Centrifugal pump for pumping molten masses, especially molten explosives. Molten explosives having a high content of infusible solid explosive are gravimetrically pumped due to the associated dangers. This makes high buildings and protective surrounding walls necessary, with the disadvantage of considerable effort and high costs as well as relatively poor accessibility to the installations. The object of the invention is to avoid these disadvantages and to permit the pumping of molten explosives to be carried out on just a few levels, if not just a single level, in easily accessible and uncomplicated installations. The vertically arranged pump shaft of a centrifugal pump bears at its lower end an unchokeable impeller with upwardly open blades, with which the pump housing forms an annular gap and, at the end, a free space which is connected by means of bores directed obliquely outwards from bottom to top to the pumping space located above the impeller and fed with pumping medium from above. Pumping of molten masses, in particular having a high solids content, and in particular molten explosives having a high content of infusible high-energy solid explosive.

Description

Die Erfindung betrifft eine Kreiselpumpe für die Förderung von Sprengstoffschmelzen, insbesondere solche mit einem hohen Feststoffanteil nicht schmelzbarer energiereicher Sprengstoffe.The invention relates to a centrifugal pump for the conveyance of explosive melts, in particular those with a high solid content of non-meltable high-energy explosives.

Bei der Herstellung gegossener Sprengladungen für Artilleriemunition, Raketengefechtsköpfe, Minen, Bomben usw. besteht in zunehmenden Maße die Notwendigkeit, das gut schmelz- und gießbare Trinitrotuluol durch nicht schmelzbare energiereichere Sprengstoffe, wie z.B. Hexogen und Octogen zu ersetzen. Dabei ist man einerseits bestrebt, den Anteil der schmelzbaren Komponente Trinitrotoluol (TNT) soweit wie möglich abzusenken, andererseits diesen Anteil aber nur soweit abzusenken, daß die Gießbarkeit des Sprengstoffgemisches erhalten bleibt. Feststoffanteile von 60 Gew.% und mehr kommen dabei zur Anwendung.In the manufacture of cast explosive charges for artillery ammunition, rocket warheads, mines, bombs etc., there is an increasing need to destroy the easily meltable and pourable trinitrotuluol by non-meltable, high-energy explosives, e.g. Replace hexogen and octogen. On the one hand, efforts are made to reduce the proportion of the fusible component trinitrotoluene (TNT) as much as possible, but on the other hand to reduce this proportion only to the extent that the pourability of the explosive mixture is retained. Solids contents of 60% by weight and more are used.

Beim Fördern derartiger Sprengstoffschmelzen mit einem hohen Anteil an nicht schmelzbaren energiereicheren Feststoffen mittels Pumpen besteht die Gefahr, daß der in der Schmelze suspendierte Feststoff beim Durchgang durch die Pumpe durch Scherkräfte beansprucht und/oder eine Veränderung der Korngrößenverteilung des suspendierten Feststoffes in der Schmelze herbeigeführt wird, was außer einer unerwünschten Veränderung des Verhaltens der Sprengstoffmischung die Gefahr von Explosionen zur Folge hat. Diese Gefahr ist insbesondere auch dann, wenn eine Sprengstoffschmelze dieser Art mittels einer Pumpe unter Vakuum aus einem Behälter zu einer weiteren Verarbeitungsstelle gefördert werden soll, gegeben, wenn der Behälter weitgehend leergepumpt ist und die restliche Sprengstoffschmelze mit verhältnismäßig großer Beschleunigung aus dem Behälter herausgepumpt wird.When pumping such explosive melts with a high proportion of non-meltable, high-energy solids by means of pumps, there is a risk that the solid suspended in the melt will be subjected to shear forces when passing through the pump and / or a change in the particle size distribution of the suspended solid in the melt will be brought about, which, apart from an undesirable change in the behavior of the explosive mixture, results in the risk of explosions. This danger is particularly also when an explosive melt of this type is to be conveyed from a container to a further processing point under vacuum by means of a pump, given when the container is largely pumped empty and the remaining explosive melt is pumped out of the container with relatively great acceleration.

Um dieser Gefahr zu begegnen, werden hochwertige Sprengstoffschmelzen gravimetrisch gefördert, d.h. die Sprengstoffschmelzen werden unter Ausnutzung ihrer Sinkgeschwindigkeit entsprechend ihrer Schwere in vertikaler Richtung von oben nach unten gefördert. Entsprechend werden die Verfahrensschritte des Herstellens, nämlich Mischen und Konditionieren der Schmelze, des Bereithaltens der Schmelze zum Gießen und des Gießens der Ladungen fortlaufend von oben nach unten, also übereinander angeordnet. Bei den bekannten Anlagen zur Herstellung von gegossenen Sprengladungen für Artilleriemunition, Raktengefechtsköpfe, Minen, Bomben usw. sind dadurch aber sehr aufwendige hohe Gebäude erforderlich. Dazu kommt, daß wegen des aus Sicherheitsgründen erforderlichen Nachbarschaftsschutzes entsprechend hohe Umwallungen vorgesehen werden müssen, die höher als die Gebäude ausgeführt werden müssen und die daher sehr aufwendig und teuer sind. Nachteilig bei diesen Anlagen ist darüberhinaus die verhältnismäßig schlechte Zugänglichkeit, insbesondere im Falle der Notwendigkeit von Reparaturen.To counter this danger, high-quality explosive melts are gravimetrically conveyed, i.e. the explosive melts are conveyed using their sinking speed in a vertical direction from top to bottom according to their severity. Correspondingly, the process steps of manufacturing, namely mixing and conditioning the melt, keeping the melt ready for casting and casting the charges are arranged continuously from top to bottom, that is to say one above the other. In the known systems for the production of cast explosive charges for artillery ammunition, missile warheads, mines, bombs etc., however, very complex high buildings are required. In addition, because of the neighborhood protection required for security reasons, correspondingly high walls must be provided, which must be made higher than the buildings and which are therefore very complex and expensive. A disadvantage of these systems is also the relatively poor accessibility, especially in the event that repairs are necessary.

Die Erfindung macht es sich zur Aufgabe, die Herstellung gegossener Sprengladungen für Artilleriemunition, Raketengefechtsköpfe, Minen, Bomben usw. aus hochwertigen Sprengstoffschmelzen mit einem hohen Anteil an nicht schmelzbaren energiereichen Sprengstoffen, wie z.B. Hexogen und Octogen zu vereinfachen und zu verbilligen.The invention makes it its task to simplify and reduce the cost of producing cast explosive charges for artillery ammunition, rocket warheads, mines, bombs, etc. from high-quality explosive melts with a high proportion of non-meltable, high-energy explosives, such as, for example, hexogen and octogen.

Die erfindungsgemäße Aufgabe wird gelöst durch eine Kreiselpumpe nach Anspruch 1 und deren Verwendung nach Anspruch 11. Zweckmäßige weitere Ausgestaltungen der erfindungsgemäßen Kreiselpumpe sind in den Ansprüchen 2 bis 10 beschrieben.The object of the invention is achieved by a centrifugal pump according to claim 1 and its use according to claim 11. Advantageous further developments of the centrifugal pump according to the invention are described in claims 2 to 10.

Durch die erfindungsgemäße Ausbildung der Kreiselpumpe mit einem an sich bekannten, mit seinen offenen Förderschaufeln jedoch nach oben gerichteten und außerhalb des Förderstroms angeordneten Freistromlaufrad, das mit dem Pumpengehäuse einen seitlichen Ringspalt und einen unterhalb des Laufrades befindlichen Freiraum bildet, der über die von unten nach oben schräg radial auswärts gerichteten Laufradbohrungen mit dem Förderraum bzw. den Laufradschaufelzwischenräumen verbunden ist, wird in vorteilhafter Weise eine schonende Förderung der Schmelze gewährleistet, wobei gleichzeitig sichergestellt ist, daß weder die Korngröße der Feststoffteilchen in der Schmelze durch Scherkräfte noch die Kornverteilung in der Schmelze verändert wird.By designing the centrifugal pump according to the invention with a free-flow impeller known per se, but with its open delivery blades pointing upwards and arranged outside the flow, which forms a lateral annular gap with the pump housing and a free space located below the impeller, which extends from below to above obliquely radially outward impeller bores are connected to the delivery space or the impeller blade spaces, a gentle conveying of the melt is advantageously ensured, while at the same time ensuring that neither the grain size of the solid particles in the melt is changed by shear forces nor the grain distribution in the melt .

Durch den Ringspalt wird in Verbindung mit den Laufradbohrungen erreicht, daß sich über den ganzen Umfang des Laufrades hinweg ein ringwirbelförmiger Fluß der Schmelze einstellt, der sicherstellt, daß der unterhalb des Laufrades befindliche Freiraum gleichmäßig und ständig so stark durchströmt wird, daß keine Sedimentation von Feststoffteilchen erfolgen kann.The annular gap in connection with the impeller bores ensures that an annular vortex-shaped flow of the melt occurs over the entire circumference of the impeller, which ensures that the free space underneath the impeller is flowed through uniformly and constantly so strongly that no sedimentation of solid particles can be done.

Die ständige starke Durchströmung des Ringspaltes zwischen Freistromlaufrad und Pumpengehäuse sorgt darüberhinaus in vorteilhafter Weise für eine hydrodynamische Zentrierung von Laufrad und Pumpenwelle.The constant strong flow through the annular gap between the free-flow impeller and the pump housing moreover advantageously ensures hydrodynamic centering of the impeller and pump shaft.

Der Ringspalt wie auch die Laufradbohrungen sind dabei selbstverständlich stets so bemessen, daß die größten in der Schmelze vorhandenen Feststoffteilchen ungehindert passieren können. Durch die erfindungsgemäße Verwendung eines insbesondere als Membranventil ausgebildeten Absperrventils im Pumpengehäuseverschlußdeckel wird in vorteilhafter Weise des weiteren erreicht, daß Toträume für Sprengstoffreste, die ein Auskristallisieren der Schmelze zur Folge haben könnten, sicher vermieden werden.The annular gap and the impeller bores are of course always dimensioned so that the largest solid particles present in the melt can pass unhindered. Through the use according to the invention of a shut-off valve in the pump housing sealing cover, which is designed in particular as a diaphragm valve, it is further advantageously achieved that dead spaces for explosive residues which could result in the melt crystallizing out are reliably avoided.

Je nach dem, ob die erfindungsgemäße Kreiselpumpe zum Fördern der Schmelze nur zwischen einzelnen oder aber zwischen mehreren oder gar allen Verfahrensschritten bei der Herstellung von Sprengladungen Verwendung findet, läßt sich eine Verlagerung der Verfahrensschritte in wenige oder gar in eine einzige Ebene erreichen, was zur Folge hat, daß nur entsprechend niedrigere Gebäude und Schutzumwallungen erforderlich sind, so daß sich der Aufwand für Gebäude und Schutzumwallungen erheblich vermindert und gleichzeitig auch die Zugänglichkeit der einzelnen Teile der gesamten Anlage verbessert wird.Depending on whether the centrifugal pump according to the invention for conveying the melt is used only between individual or between several or even all process steps in the manufacture of explosive charges, the process steps can be shifted to a few or even to a single level, which results has that only correspondingly lower buildings and protective walls are required, so that the effort for buildings and protective walls is considerably reduced and at the same time the accessibility of the individual parts of the entire system is improved.

Die Erfindung ist in der Zeichnung in einem Ausführungsbeispiel gezeigt und wird anhand dieses im folgenden beschrieben. Es zeigen

Figur 1
in einem Axialschnitt in schematischer Darstellung die erfindungsgemäße Kreiselpumpe,
Figur 2
in einem Ausschnitt in vergrößtertem Maßstab den unteren Teil der Kreiselpumpe und
Figur 3
einen Schnitt gemäß der Linie A-A der Figur 2.
The invention is shown in the drawing in an embodiment and will be described with reference to this in the following. Show it
Figure 1
the centrifugal pump according to the invention in an axial section in a schematic representation,
Figure 2
in a section on an enlarged scale the lower part of the centrifugal pump and
Figure 3
a section along the line AA of Figure 2.

Die vertikal angeordnete Pumpenwelle 1 ist im Lagergehäuse 2 in bekannter Weise in den Wälzlagern 2a drehbar und in axialer Richtung fixiert gelagert. Der Antrieb erfolgt in an sich ebenfalls bekannter Art und Weise über die Kupplung 3 durch den Motor 4, die vorzugsweise als elastische Kupplung und drehzahlregelbarer hydrostatischer Axialkolbenmotor ausgebildet sind. Am unteren Ende der Pumpenwelle 1 ist das Freistromlaufrad 5 befestigt. Im Falle der Verwendung der Kreiselpumpe für die Förderung von Sprengstoffschmelzen wird das Laufrad 5 mit der Welle 1 entsprechend den einschlägigen Vorschriften verschweißt, da Bauteile, die in Sprengstoff bzw. Sprengstoffschmelzen laufen, keine lösbaren Verbindungen aufweisen dürfen. Das Laufrad 5 ist mit den nach oben gerichteten offenen Förderschaufeln 5a versehen. Gemäß Figur 3 sind acht Förderschaufeln vorgesehen, es könnte selbstverständlich aber auch eine andere Schaufelzahl realisiert werden.The vertically arranged pump shaft 1 is rotatably mounted in the bearing housing 2 in a known manner in the roller bearings 2a and is fixed in the axial direction. The drive takes place in a manner known per se via the clutch 3 through the motor 4, which are preferably designed as an elastic coupling and a speed-adjustable hydrostatic axial piston motor. The free-flow impeller 5 is attached to the lower end of the pump shaft 1. If the centrifugal pump is used to convey explosive melts, the impeller 5 is welded to the shaft 1 in accordance with the relevant regulations, since components which run in explosive or explosive melts must not have any detachable connections. The impeller 5 is provided with the open conveyor blades 5a pointing upwards. According to FIG. 3, eight conveyor blades are provided, but a different number of blades could of course also be implemented.

Mit dem Lagergehäuse 2 ist das als beheiztes doppelwandiges Rohr ausgebildete und mittels der Ringe 22 und 23 am oberen bzw. unteren Ende verschlossene Führungsrohr 6 durch Verschraubungen verbunden. In der oberen Verschlußplatte 22 sind Anschlüsse für den Vor- und Rücklauf des Beheizungsmediums, beispielsweise Warmwasser, vorgesehen, die hier aber nicht näher beschrieben werden sollen. Selbstverständlich wird durch geeignete an sich bekannte Einrichtungen dafür Sorge getragen, daß das Heizmedium stets die gewünschte und erforderliche Temperatur aufweist. An seinem unteren Ende ist das Führungsrohr 6 mit dem Leitring 7 und unmittelbar über diesem mit den Öffnungen 8 für den Zulauf des Fördermediums in den sich über dem Laufrad 5 befindenden Förderraum 9 versehen.With the bearing housing 2, the guide tube 6, which is designed as a heated double-walled tube and is closed by means of the rings 22 and 23 at the upper and lower ends, is connected by means of screw connections. Connections for the supply and return of the heating medium, for example hot water, are provided in the upper closure plate 22, but these are not to be described in more detail here. Of course, suitable means known per se ensure that the heating medium is always at the desired and required temperature. At its lower end is the guide tube 6 with the guide ring 7 and immediately Above this with the openings 8 for the supply of the medium into the delivery chamber 9 located above the impeller 5.

Das Pumpengehäuse 10 ist in gewohnter Weise als Spiralgehäuse ausgebildet, es könnte aber ebenso auch kreisförmige Gestalt haben, insbesondere wenn man sich mit einem geringeren Wirkungsgrad der Kreiselpumpe zufrieden geben kann und/oder wenn man Schmelze mit verhältnismäßig groben Feststoffteilchen fördern will. Das Pumpengehäuse 10 ist mit dem vollständig beheizten doppelwandigen Pumpentopf 11 verbunden, vorzugsweise verschweißt. Die gezeigte zylindrische Form des Pumpentopfs 11 ist nur aus Gründen der vereinfachten schematischen Darstellung gewählt, selbstverständlich kann der Pumpentopf 11 in vielerlei Weise anders gestaltet sein und insbesondere die bei Kesseln hinlänglich bekannten Formen aufweisen. Als Heizmedium für den Pumpentopf 11 kommen wiederum die an sich bekannten und üblichen Medien, insbesondere Warmwasser in Betracht. Auch hier wird durch nicht gezeigte bekannte und übliche Einrichtungen dafür gesorgt, daß durch einen entsprechenden geregelten Zu- und Ablauf, also einen entsprechend gesteuerten Durchlauf des Mediums, die gewünschte bzw. erforderliche Betriebstemperatur möglichst genau eingehalten wird.The pump housing 10 is designed in the usual way as a spiral housing, but it could also have a circular shape, especially if you can be satisfied with a lower efficiency of the centrifugal pump and / or if you want to promote melt with relatively coarse solid particles. The pump housing 10 is connected to the completely heated double-walled pump bowl 11, preferably welded. The cylindrical shape of the pump bowl 11 shown is chosen only for the sake of the simplified schematic representation, of course the pump bowl 11 can be designed differently in many ways and in particular have the shapes well known in boilers. The known and customary media, in particular hot water, are again suitable as heating medium for the pump pot 11. Here too, known and customary devices (not shown) ensure that the desired or required operating temperature is maintained as precisely as possible by means of a correspondingly regulated inlet and outlet, that is to say a correspondingly controlled passage of the medium.

Das Führungsrohr 6 mit Lagergehäuse 2 und eingebauter Pumpenwelle 1 mit Freistromlaufrad 5 sind von oben in den Pumpentopf 11 eingesteckt und mit diesem durch Verschraubung verbunden, wobei die Pumpenwelle 1 unter Belassung des Ringspaltes 26 mit Spiel durch die Abdeck- und Verschlußplatte 27 hindurchgeführt ist.The guide tube 6 with bearing housing 2 and built-in pump shaft 1 with free-flow impeller 5 are inserted into the pump bowl 11 from above and connected to it by screwing, the pump shaft 1 being passed through the cover and closure plate 27 with play while leaving the annular gap 26.

Die gesamte Einrichtung, komplettiert durch die Kupplung 3 und den Antriebsmotor 4 ist in nicht gezeigter aber bekannter und üblicher Weise mittels geeigneter Rahmenbauteile abgestützt und in ihrer Lage gehalten.The entire device, completed by the coupling 3 and the drive motor 4, is supported in a position which is not shown but is known and customary by means of suitable frame components and is held in position.

Für den Zulauf des Fördermediums ist im unteren Bereich des Pumpentopfs 11, aber oberhalb des Laufrades 5, der durch den Pumpentopf 11 hindurchgeführte Zulaufstutzen 12 mit Absperrventil 12a und für den Austritt des Fördermediums aus der Pumpe unmittelbar oberhalb des Laufrades 5 der wiederum durch den Pumpentopf 11 hindurchgeführte Druckstutzen 13 mit angeflanschter Abflußleitung 13a vorgesehen.In the lower area of the pump bowl 11, but above the impeller 5, the inlet connection 12 with the shut-off valve 12a through the pump bowl 11 is for the inlet of the pumped medium and for the outlet of the pumped medium from the pump immediately above the impeller 5, which in turn is through the pump bowl 11 pressure pipe 13 passed therethrough with a flanged drain line 13a.

Der unterhalb des scheibenförmigen Teils 5b des Laufrades 5 zwischen diesem und dem Pumpengehäuse 10 gebildete Freiraum 16 ist über den Ringspalt 17 zwischen Laufrad 5 und Pumpengehäuse 10 sowie die von unten nach oben schräg radial nach auswärts gerichteten Bohrungen 18 im Laufradteil 5b mit dem Förderraum 9 der Pumpe verbunden. Die Breite des Ringspaltes 17 und der lichte Gesamtquerschnitt der gemäß Figur 3 mittig zwischen den Förderschaufeln 5a angeordneten Bohrungen 18 sind dabei so aufeinander abgestimmt und die Richtung der Bohrungen 18 ist außerdem so gewählt, daß sich im Betrieb auf den ganzen Umfang des Laufrades 5 hinweg eine gleichmäßige und kräftige ringförmige, in den Bohrungen 18 von unten nach oben und im Ringspalt 17 von oben nach unten gerichtete Durchströmung einstellt, die verhindert, daß eine Sedimentation von Feststoffteilchen in der Schmelze erfolgen kann. Die Durchströmung des Ringspaltes 17 zwischen dem Laufrad 5 und dem diesem benachbart im Pumpengehäuse 10 angeordneten Leitring 19 sorgt darüberhinaus für eine hydrodynamische Zentrierung von Laufrad 5 und Pumpenwelle 1.The space 16 formed underneath the disk-shaped part 5b of the impeller 5 between the impeller 5 and the pump housing 10 is via the annular gap 17 between the impeller 5 and the pump housing 10 and the bores 18 in the impeller part 5b with the delivery chamber 9 which are directed radially outwards from bottom to top Pump connected. The width of the annular gap 17 and the clear overall cross-section of the bores 18 arranged centrally between the conveying blades 5a according to FIG. 3 are coordinated with one another and the direction of the bores 18 is also selected such that there is one on the entire circumference of the impeller 5 during operation uniform and strong annular flow in the bores 18 from bottom to top and in the annular gap 17 from top to bottom, which prevents sedimentation of solid particles in the melt. The flow through the annular gap 17 between the impeller 5 and the adjacent in the Pump housing 10 arranged guide ring 19 also ensures hydrodynamic centering of impeller 5 and pump shaft 1.

Vorteilhaft wird der Gesamtquerschnitt der Laufradbohrungen mindestens gleich groß ausgeführt wie der Querschnitt des Ringspalts zwischen Laufrad und Pumpengehäuse, um die Ausbildung der ringwirbelförmigen Strömung des Fördermediums in zweckmäßiger Weise zu beeinflussen. Die Förderung von Fördermedium durch die Laufradbohrungen hindurch kann auch dadurch beeinflußt werden, daß die Neigung der Achsen der Laufradbohrungen gegenüber der Pumpenwellenachse relativ groß gewählt wird, so daß der Eintritt in die Bohrungen an der Laufradunterseite und der Austritt aus den Bohrungen an der Laufradoberseite mehr oder weniger weit auseinander liegen. Einerseits kann hierdurch die Fördermenge durch die Bohrungen hindurch innerhalb gewisser Grenzen verändert werden, andererseits ermöglicht dies, den Querschnitt der einzelnen Laufradbohrungen in entsprechendem Maße zu beeinflussen, ohne dadurch die Ausbildung der gewünschten und erforderlichen Ringwirbelströmung des Fördermediums zu beeinträchtigen.The overall cross section of the impeller bores is advantageously made at least the same size as the cross section of the annular gap between the impeller and the pump housing in order to influence the formation of the annular vortex-shaped flow of the delivery medium in a suitable manner. The conveying of pumped medium through the impeller bores can also be influenced in that the inclination of the axes of the impeller bores with respect to the pump shaft axis is selected to be relatively large, so that the entry into the bores on the underside of the impeller and the exit from the bores on the top of the impeller are more or less are less far apart. On the one hand, the delivery rate through the bores can be changed within certain limits, on the other hand, this enables the cross-section of the individual impeller bores to be influenced to a corresponding extent without thereby impairing the formation of the desired and required annular vortex flow of the delivery medium.

Wie bereits erwähnt, kann anstelle der in Figur 3 gezeigten Anzahl von acht Laufradschaufeln auch eine andere Schaufelzahl verwirklicht werden. In jedem Fall werden die Anzahl und die Form der Laufradschaufeln unter Berücksichtigung der jeweiligen Gegebenheiten so gewählt bzw. bestimmt, wie es sich für die Erzielung eines ausreichend kräftigen Ringwirbels im Fördermedium als notwendig erweist.As already mentioned, instead of the number of eight impeller blades shown in FIG. 3, a different number of blades can also be implemented. In any case, the number and the shape of the impeller blades are selected or determined taking into account the respective circumstances, as it proves to be necessary to achieve a sufficiently strong ring vortex in the pumped medium.

Entsprechendes gilt auch in Bezug auf die Laufradbohrungen, d.h. von ausschlaggebender Bedeutung ist nicht die Anzahl der Laufradbohrungen, sondern deren Gesamtquerschnitt unter Berücksichtigung ihrer Richtung. Abweichend von der in Figur 3 gezeigten - aus Gründen einer symetrischen Anordnung und einfacher Herstellung gewählten - Ausführungsform mit je einer mittig zwischen benachbarten Laufradschaufeln angeordneten Laufradbohrung könnte der gleiche Gesamtquerschnitt der Bohrungen auch durch eine andere Anzahl von Laufradbohrungen verwirklicht werden. Beispielsweise ist es möglich, zwischen einzelnen oder allen einander benachbarten Laufradschaufeln Laufradbohrungen in gleicher oder auch unterschiedlicher Anzahl vorzusehen, wobei dann bei den einzelnen Laufradbohrungen entsprechende größere, kleinere und insbesondere auch unterschiedliche Querschnitte verwirklicht werden könnten. Im Sinne der Beeinflussung der Ausbildung der gewünschten Ringwirbelströmung des Fördermediums ist es dabei auch möglich, die Richtung der Laufradbohrungen gleich oder unterschiedlich auszubilden. Zweckmäßig wird jedoch in allen Fällen vorgesehen, daß sich eine über den Gesamtumfang hinweg betrachtet symetrische Ringwirbelströmung des Fördermediums einstellt.The same applies to the impeller bores, i.e. The decisive factor is not the number of impeller bores, but their total cross-section, taking into account their direction. In a departure from the embodiment shown in FIG. 3, chosen for reasons of a symmetrical arrangement and simple manufacture, each with an impeller bore arranged centrally between adjacent impeller blades, the same overall cross section of the bores could also be realized by a different number of impeller bores. For example, it is possible to provide impeller bores in the same or a different number between individual or all adjacent impeller blades, in which case corresponding larger, smaller and in particular also different cross sections could be realized in the individual impeller bores. In order to influence the formation of the desired ring vortex flow of the medium, it is also possible to design the direction of the impeller bores the same or different. In all cases, however, it is expediently provided that an annular vortex flow of the conveying medium, which is symmetrical over the entire circumference, is established.

Am unteren Ende des Pumpengehäuses 10 ist der Verschlußdeckel 20 angeordnet, der zentrisch das beheizte Membran-Absperrventil 21 trägt, welches eine totale Entleerung der Pumpe im Stillstand erlaubt, wie sie erforderlich sein kann, wenn eine längere Unterbrechung der Förderung oder eine Produktänderung erfolgen soll.At the lower end of the pump housing 10, the closure cover 20 is arranged, which carries the heated membrane shut-off valve 21 centrally, which allows total emptying of the pump at a standstill, as may be required if a longer interruption of the delivery or a product change is to take place.

Im Bereich des oberen Endes des Pumpentopfes 11 ist, durch diesen hindurchgeführt und über die Öffnung 6a im Führungsrohr 6 auch mit dem die Pumpenwelle 1 umgebenden Raum 28 verbunden, der Produktraum über den Stutzen 14 an eine nicht gezeigte Absauge- und Abgasreinigungseinrichtung, beispielsweise einer Sprengstoff-Schmelz- und -Gießanlage, angeschlossen. Durch den hierdurch angelegten Unterdruck wird erreicht, daß die Durchführung der Pumpenwelle 1 durch den Ringspalt 26 ständig belüftet ist und somit keine toxischen Gase oder Dämpfe durch den Ringspalt 26 in die Umgebung entweichen können. Dieser Unterdruck bewirkt gleichzeitig aber auch eine sichere Abführung der in Folge der Ausbildung der Pumpe mit Zulauf des Fördermediums zum Laufrad 5 von oben und der Ausbildung des Laufrades 5 mit nach oben offenen Förderschaufeln 5a zwangsläufig bzw. selbsttätig bewirkten Entgasung des Fördermediums freigesetzten Gase.In the area of the upper end of the pump pot 11, passed through it and connected via the opening 6a in the guide tube 6 also to the space 28 surrounding the pump shaft 1, the product space is connected via the nozzle 14 to a suction and exhaust gas cleaning device, not shown, for example an explosive -Melting and casting plant, connected. The resultant negative pressure ensures that the passage of the pump shaft 1 is constantly ventilated through the annular gap 26 and thus no toxic gases or vapors can escape through the annular gap 26 into the environment. This negative pressure also causes a safe discharge of the gases released as a result of the formation of the pump with the supply of the medium to the impeller 5 from above and the formation of the impeller 5 with upwardly open delivery blades 5a, which automatically or automatically causes degassing of the medium.

Wie aus Figur 1 ersichtlich, ist hier der Stutzen 14 durch die doppelwandige Ausbildung in Verbindung mit dem Anschlußstutzen 24 gleichzeitig als Rücklauf für das dem Pumpentopf 11 über den Anschlußstutzen 25 an seinem unteren Ende zugeführte Heizmedium genutzt. Selbstverständlich sind aber auch andere geeignete konstruktive Lösungen möglich.As can be seen from FIG. 1, the connector 14 is used here at the same time as a return for the heating medium supplied to the pump bowl 11 via the connector 25 at its lower end due to the double-walled design in connection with the connector 24. Of course, other suitable constructive solutions are also possible.

Über den Rücklaufstutzen 15 mit Absperrvorrichtung 15a ist die Förderleitung 13a mit dem Produktraum 28 verbunden. Dadurch ist es möglich, bei einer kurzzeitigen Unterbrechung der Förderung zunächst die Zulaufarmatur 12a zum Pumpentopf 11 zu schließen und dann bei Erreichen eines Minimalstandes des Fördermediums im Pumpentopf 11 die Verbindung zwischen der Förderleitung 13a und dem Rücklaufstutzen 15 mittels der Absperrvorrichtung 15a zu öffnen. Hierdurch wird in der Folge der Inhalt der Förderleitung 13a in den Pumpentopf 11 bzw. den Produktraum 28 entleert und dort weiter umgewälzt, wodurch eine Verstopfung von Leitungen ebenso wie eine Sedimentation von Feststoffteilchen im Fördermedium sicher verhindert werden. Durch die dann leere Transportleitung wird darüberhinaus im Ereignisfall eine Explosionsübertragung verhindert.The delivery line 13a is connected to the product space 28 via the return pipe 15 with shut-off device 15a. This makes it possible, in the event of a brief interruption in the delivery, to first close the inlet fitting 12a to the pump bowl 11 and then, when the delivery medium in the pump bowl 11 has reached a minimum level, to connect the delivery line 13a and the return pipe 15 to be opened by means of the shut-off device 15a. As a result, the contents of the delivery line 13a are subsequently emptied into the pump bowl 11 or the product space 28 and circulated there further, thereby reliably preventing line clogging and sedimentation of solid particles in the delivery medium. The then empty transport line also prevents an explosion transmission in the event of an event.

Abgesehen von einer willentlich herbeigeführten Unterbrechung der Förderung kann eine solche in Verbindung mit einer nicht gezeigten Niveaukontrolle im Pumpentopf durch ein von dieser etwa im Falle der Unterschreitung einer vorgegebenen Mindestfüllhöhe gegebenes Signal automatisch erfolgen, indem durch dieses Signal zuerst die Schließung der Zulaufarmatur 12a und danach die Öffnung der Rücklaufarmatur 15 bewirkt wird. Entsprechendes kann umgekehrt auch dann erfolgen, wenn die vorgegebene Mindestfüllhöhe im Pumpentopf 11 wieder erreicht bzw. überschritten wird. In Verbindung mit der Niveauüberwachung im Pumpentopf 11 kann auch vorgesehen werden, daß ein Starten der Pumpe erst bei Vorliegen einer vorgegebenen Mindestfüllhöhe erfolgen kann. Auch hier lassen sich in bekannter Art und Weise und mit bekannten Mitteln entsprechende Signale automatisch verarbeiten.Apart from a deliberate interruption of the delivery, this can be done automatically in connection with a level control, not shown, in the pump bowl by a signal given by the latter, for example, if a predetermined minimum fill level is undershot, by first closing the inlet fitting 12a and then the Opening the return valve 15 is effected. The opposite can also take place if the predetermined minimum fill level in the pump bowl 11 is reached or exceeded again. In connection with the level monitoring in the pump bowl 11 it can also be provided that the pump can only be started when a predetermined minimum fill level is present. Corresponding signals can also be automatically processed here in a known manner and with known means.

Eine vorstehend beschriebene und in vielfacher Weise modifizierbare Kreiselpumpe kann zwischen einzelnen, mehreren oder auch allen Verfahrensschritten bei der Herstellung von gegossenen Ladungen, insbesondere aus Sprengstoffschmelzen vorgesehen werden. So kann beispielsweise der Zulaufstutzen 12 mit Absperrarmatur 12a an einen nicht gezeigten Schmelzkessel und die Förderleitung 13a an den darauffolgenden ebenfalls nicht gezeigten Mischkessel und/oder beispielsweise an einen wiederum nicht gezeigten Konditionierkessel und einen desgleichen nicht gezeigten darauffolgenden Kessel für die Bereithaltung der Schmelze zum Gießen angeschlossen sein, wobei die Kreiselpumpe bzw. Kreiselpumpen in der jeweils erforderlichen Weise betrieben werden.A centrifugal pump described above and which can be modified in many ways can, in particular, between individual, several or even all process steps in the production of cast loads be provided from explosive melts. For example, the inlet connection 12 with shut-off valve 12a can be connected to a melting tank (not shown) and the delivery line 13a can be connected to the subsequent mixing tank, also not shown, and / or, for example, to a conditioning tank, again not shown, and a subsequent boiler, likewise not shown, for keeping the melt ready for casting be, wherein the centrifugal pump or centrifugal pumps are operated in the manner required in each case.

Claims (12)

  1. Centrifugal pump, characterized in that, in order to deliver melts with a high solids content, in particular explosive melts of trinitrotoluene with a high content of non-meltable, high-energy solid explosive, such as, e.g. hexogen and octogen,
    a) the pump shaft (1), the upper end of which is mounted in a rotatable and axially fixed manner, is arranged vertically and
    b) is provided at its lower end with a free-flow impeller (5), which is firmly connected to it, with vanes (5a) which are open at the top, which impeller
    c) forms with the laterally surrounding pump casing (10) an annular gap (17) and with a detachable pump casing cover (20) a free space (16) at the front end which
    d) is connected via a plurality of bores (18), which are formed in the impeller (5), are preferably uniformly distributed over the circumference and extend obliquely upwards from the bottom, to the delivery chamber (9), which is disposed above the impeller (5) and is provided with a feed line (12), which is provided with a shut-off member (12a) and arranged above the impeller (5), and with a discharge line (13), and that
    e) the entire pump chamber through which the delivery medium flows is heated.
  2. Centrifugal pump according to claim 1, characterized in that the overall cross section of the bores (18) in the impeller (5) is at least as great as, preferably greater than the cross section of the annular gap (17) between the impeller (5) and the pump casing (10).
  3. Centrifugal pump according to claim 1 or 2, characterised in that the pump casing cover (20) is provided with a heated shut-off valve (21).
  4. Centrifugal pump according to claim 3, characterised in that the shut-off valve (21) is formed as a diaphragm shut-off valve.
  5. Centrifugal pump according to claim 3 or 4, characterised in that the shut-off valve (21) is arranged centrally in the pump casing cover (20).
  6. Centrifugal pump according to one of claims 1 to 5, characterised in that the heating system of the pump chamber is formed as a hot water heating system.
  7. Centrifugal pump according to one of claims 1 to 6, characterised in that the pump casing (10) is formed as a heated pump pot (11) surrounding the lower part of the pump shaft (1) with the impeller (5) and containing the delivery medium.
  8. Centrifugal pump according to claim 7, characterised in that the pump pot (11) is closed at its upper end by a cover (27), which encloses the pump shaft (1) in a non-sealing manner.
  9. Centrifugal pump according to claim 7 or 8, characterised in that the pump pot (11) is connected in the area of its upper end to the discharge line (13a) by means of a return line (15), which is provided with a shut-off device (15a).
  10. Centrifugal pump according to one of claims 7 to 9, characterised in that the pump pot (11) is connected in the area of its upper end to a waste gas suction and cleaning device by means of a line (14).
  11. Centrifugal pump according to one of claims 7 to 10, characterised in that the pump pot (11) is provided with a levelling, measuring and regulating device.
  12. Use of a centrifugal pump according to one of claims 1 to 11 for delivering the explosive melt between one or more of the steps of the process for melting the explosive, mixing the explosive melt with a non-meltable solid explosive, conditioning the explosive mixture, preparing the explosive mixture for casting and casting explosive charges for artillery ammunition, missile warheads, mines, bombs or the like.
EP89118161A 1988-11-18 1989-09-30 Centrifugal pump for pumping molten masses, especially molten explosives Expired - Lifetime EP0369144B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89118161T ATE97468T1 (en) 1988-11-18 1989-09-30 CENTRIFUGAL PUMP FOR TRANSPORTING MELTES, ESPECIALLY EXPLOSIVE MELTES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3839024A DE3839024A1 (en) 1988-11-18 1988-11-18 CENTRIFUGAL PUMP FOR PROCESSING MELT, ESPECIALLY EXPLOSIVE MELT
DE3839024 1988-11-18

Publications (3)

Publication Number Publication Date
EP0369144A2 EP0369144A2 (en) 1990-05-23
EP0369144A3 EP0369144A3 (en) 1991-01-16
EP0369144B1 true EP0369144B1 (en) 1993-11-18

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ID=6367422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118161A Expired - Lifetime EP0369144B1 (en) 1988-11-18 1989-09-30 Centrifugal pump for pumping molten masses, especially molten explosives

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EP (1) EP0369144B1 (en)
AT (1) ATE97468T1 (en)
DE (2) DE3839024A1 (en)

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Publication number Priority date Publication date Assignee Title
AU2002360973A1 (en) * 2001-12-16 2003-06-30 Leutert, Herbert Method and device for transporting a flowable building material
EP1327780B1 (en) * 2001-12-16 2006-03-01 Leutert, Herbert Method for pumping liquified construction materials
NO327547B1 (en) * 2007-12-05 2009-08-10 Engervik Technology As System and method for discharging a fluid
CN107503947A (en) * 2017-09-13 2017-12-22 中广核研究院有限公司 Liquid metal conveying mechanical pump
CN109456136A (en) * 2018-11-09 2019-03-12 麻城凯龙科技化工有限公司 A kind of modified ammonium nitrate-fuel oil explosive oil phase filling apparatus and method
JP2023506275A (en) * 2019-12-23 2023-02-15 アシスト・メディカル・システムズ，インコーポレイテッド Multi-fluid delivery system

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Publication number Priority date Publication date Assignee Title
GB695434A (en) * 1951-02-03 1953-08-12 Sulzer Ag Multi-stage pumps
US2858768A (en) * 1954-08-12 1958-11-04 Union Carbide Corp Corrosion resistant pump
DE1528896A1 (en) * 1963-07-29 1969-07-17 Albert Ziegler Schlauch U Feue Centrifugal pump
SU1139892A1 (en) * 1983-12-16 1985-02-15 Сумский Филиал Харьковского Ордена Ленина Политехнического Института Им.В.И.Ленина Torque flow pump

Also Published As

Publication number Publication date
DE58906209D1 (en) 1993-12-23
DE3839024A1 (en) 1990-05-23
EP0369144A2 (en) 1990-05-23
EP0369144A3 (en) 1991-01-16
ATE97468T1 (en) 1993-12-15

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