EP0297274A2 - Transfer arrangement consisting of a pump with a driving device - Google Patents

Transfer arrangement consisting of a pump with a driving device Download PDF

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Publication number
EP0297274A2
EP0297274A2 EP88108221A EP88108221A EP0297274A2 EP 0297274 A2 EP0297274 A2 EP 0297274A2 EP 88108221 A EP88108221 A EP 88108221A EP 88108221 A EP88108221 A EP 88108221A EP 0297274 A2 EP0297274 A2 EP 0297274A2
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EP
European Patent Office
Prior art keywords
pump
chamber
seals
oil
motor
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.)
Granted
Application number
EP88108221A
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German (de)
French (fr)
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EP0297274B1 (en
EP0297274A3 (en
Inventor
Volkmar Dipl.-Ing. Karge
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ITT Bornemann GmbH
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Joh Heinr Bornemann GmbH
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Publication date
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Publication of EP0297274A2 publication Critical patent/EP0297274A2/en
Publication of EP0297274A3 publication Critical patent/EP0297274A3/en
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Publication of EP0297274B1 publication Critical patent/EP0297274B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/008—Pumps for submersible use, i.e. down-hole pumping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0088—Lubrication

Definitions

  • the invention relates to a delivery unit consisting of a pump with a drive device, in particular an electric motor, -
  • the pump is enclosed on all sides by a waterproof pump housing which has a suction chamber with a suction opening and a pressure chamber with an outlet opening;
  • the pump housing is connected to a likewise watertight motor housing accommodating the drive device, which includes an engine compartment which is partitioned liquid-tight with respect to the pump housing via a first partition area;
  • the motor-side bearings of the pump shaft or spindle and their seals for sealing between the motor and pump chamber are arranged in the first partition area, these seals being connected to the pump chamber on the pump side and thus being acted upon by the pumped medium;
  • the engine compartment is filled with oil that o.dergl. serves and emits the heat to the environment via the motor housing;
  • a pressure compensation space has at least one wall that can be deformed as the pressure is increased.
  • waterproof pump housing is understood to mean a housing which, apart from the suction opening and the outlet opening, has no opening which allows water to enter and is connected to the motor housing with the interposition of a corresponding seal.
  • the engine housing on its side facing away from the first partition area is closed off by a rubber membrane which separates the engine compartment from a chamber in which the entire electrical installation is housed. Due to the resilient design of the above-mentioned rubber membrane, there is an expansion possibility for the oil in the engine when it is heated, by the rubber membrane deforming into the chamber mentioned.
  • DE-OS 22 13 620 discloses a pump unit with an electric motor for underwater operation, in particular for sewage systems, in which the motor sits in a waterproof capsule with a sealed power supply.
  • the capsule is designed as a diving bell surrounding the motor housing, the cavities in the area of the electric motor and inside the diving bell being essentially completely filled with oil.
  • the oil filling inside the diving bell and in the motor housing ensures the lubrication of the motor and at the same time dissipates the heat generated in the area of the motor windings and the rotating parts to the outside.
  • Compressible bodies are provided in the oil-filled area to compensate for thermal expansion of this oil filling.
  • DE-OS 32 45 973 discloses a motor pump assembly consisting of a screw pump and a canned motor arranged thereon on the pressure side, which connects to the pressure chamber of the pump, the motor pump drive shaft being mounted between the pump part and the motor part.
  • the invention has for its object to design the delivery unit described above so that it can be used under water, especially at great depths and with changing pressurization of the suction chamber of the medium.
  • the bearings of the pump shaft or spindle facing away from the drive unit and their seals are arranged in a second partition area, which divides the suction chamber in a liquid-tight manner compared to a watertight, oil-filled lubrication chamber which communicates with the engine compartment in an oil-exchanging manner stands, these seals are on the pump side in connection with the suction chamber and are thus acted upon by the pumped medium, while the oil is used for lubrication of the bearings, the seals acted on and emits the heat via the lubricating chamber housing.
  • suction chamber and pressure chamber apply only to a certain direction of rotation of the pump.
  • the above-mentioned suction chamber becomes the pressure chamber and vice versa the above-mentioned pressure chamber becomes the suction chamber, in which case the above-mentioned outlet opening represents the suction opening and the above-mentioned suction opening the outlet opening.
  • the effect of the pressure equalization remains unchanged.
  • the possibly very high pressure of the pumping medium located in the suction chamber spreads in the said pressure compensation chamber and here leads to the fact that at least one wall of this pressure compensation chamber deforms into the engine compartment and thereby pressurizes its oil filling.
  • the pressure compensation chamber can be arranged in the engine compartment by a rubber-elastic bladder or the like. be educated. It is essential that the pressure prevailing in the suction space seeks to reduce the volume of the engine compartment filled with oil and thereby tries to compress the oil filling with a corresponding pressure increase until a pressure equalization between the pressure in the suction compartment and that in the engine compartment occurs. Therefore, only very slight pressure drops occur on the seals of the pump spindles in the area of the two partition wall areas mentioned, so that the penetration of the medium is prevented and a long service life of the seals is ensured.
  • the pumping unit shown consists of a pump 1 with a drive device 2, the pump being a screw pump, the embodiment of which corresponds to that of the unpublished European patent application No. 86113623.2.
  • the drive device 2 can be a KSB electric motor, the encapsulated motor having a water filling 3, which is connected to a pressure expansion tank 4.
  • the pump 1 is seated in a watertight pump housing 5 which has a suction opening 7 opening into a suction chamber 6.
  • This pump housing 5 is connected to a likewise watertight motor housing 8 which accommodates the drive device 2 and which encloses a motor chamber 9 which surrounds the encapsulated drive unit 2 and which is partitioned in a liquid-tight manner with respect to said suction chamber 6 via a first partition wall region 10.
  • the pump housing 5 On the side facing away from the drive unit 2, the pump housing 5 has a second partition wall area 11, which divides the aforementioned suction chamber 6 in a liquid-tight manner with respect to a lubrication chamber 12.
  • the bearings 13, 14 of the two pump spindles 15, 16 and their seals 17, 18 are arranged in the first and second partition wall regions 10, 11. Furthermore, a gear pump 19 is arranged on the motor side of the first partition wall area 10, which at the same time establishes the rotary connection between the two pump spindles 15, 16.
  • the pump spindle 15 is driven via a clutch 20.
  • a rubber-elastic bladder 21 is arranged in the engine compartment 9, which encloses a pressure compensation compartment 22, which is in fluid communication with the suction compartment 6.
  • the engine compartment 9 is filled with oil and communicates with the lubrication compartment 12 via an oil line 23 guided through the suction compartment 6.
  • the aforementioned gear pump 19 sucks oil from the engine compartment 9 and presses it via the oil line 23 into the lubrication chamber 12, from which it flows back into the engine compartment 9 via the indicated oil return line 25.
  • the oil acts on the engine side seals 17 on the engine side via channels 26 and the seals 18 facing away from the drive unit 2 from the lubrication chamber 12 via channels 27.
  • the seals 17, 18 are each acted upon by the pumping medium located in the suction chamber 6. The oil thus serves to lubricate the bearings 13, 14 and the gear wheels 19, to act on the seals 17, 18 and to dissipate heat, the heat being emitted to the environment via the motor housing 8.
  • the pumping unit shown is particularly suitable for use under water and even at great depths, the suction opening 7 then or the like to an oil hole. can be connected.
  • the pumped medium is then a multi-phase mixture of petroleum, sediments, sea water and natural gas and is or the like with a corresponding pressure increase from the outlet opening 28 into a delivery line. pressed.
  • the pumped medium can thus already have a high pressure in the suction chamber 6, which then also prevails in the pressure compensation chamber 22 of the bladder 21, which attempts to deform or expand outwards under the influence of its internal pressure.
  • the conveyor unit according to the invention can, as can be seen in the drawing, be accommodated in a compact housing which is divided in the middle and has an upper and a lower end cover, wherein these housing parts can be flanged against each other.
  • the first and second partition regions 10, 11 can be welded into the housing.
  • the housing can at its upper end with a suspension device and at its lower end with feet or the like. be provided.
  • the upper cover can advantageously form the lubrication chamber housing 29.
  • the pump pressure chamber in connection with the outlet opening 28 is designated by 30 and forms the suction chamber when the direction of rotation is reversed, the space designated by 6 then forming the pressure chamber, the opening 28 forming the suction opening and the opening 7 forming the outlet opening.
  • the drive device 2 could also be arranged outside the motor housing 8.
  • the housing of the drive device could then e.g. be flanged to the motor housing 8 instead of the lower housing cover shown in FIG. 1, in which case the motor housing 8 shown in FIG. 1 could be made much smaller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Electric Motors In General (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The invention relates to a transfer arrangement comprising a pump with a drive appliance, in particular an electric motor, the pump being enclosed on all sides by a pump housing, which has an inlet chamber with an intake aperture and a pressure chamber with an outlet aperture. In order to be able to use this transfer arrangement under water, in particular even at great depths, the following characteristics are proposed: a) the watertight pump housing is connected to a similarly watertight motor housing accommodating the drive appliance, which housing encloses a motor compartment surrounding the encapsulated drive unit, the motor compartment being divided off liquid-tight from the said inlet chamber by a first partition wall area; b) arranged in the first partition wall area are the motor-side bearing of the pump shaft and/or spindle and their seals for sealing off the motor compartment from the inlet chamber, these seals being connected on the pump side to the said inlet chamber and hence exposed to the conveying medium; c) the said motor compartment is filled with oil which serves for lubrication of the bearing, any gears etc., comes in contact with the seals and dissipates the heat via the said motor housing to its surroundings; d) the said inlet chamber is connected to a pressure equalising chamber, with which it exchanges liquid, which has at least one wall deformable into the oil-filled motor compartment in the event of increasing pressure admission.

Description

Die Erfindung betrifft ein Förderaggregat bestehend aus einer Pumpe mit einer Antriebseinrichtung, insbesondere einem Elektro­motor,
- die Pumpe ist allseitig von einem wasserdicht ausgebildeten Pumpengehäuse umschlossen, das einen Saugraum mit einer An­saugöffnung und einen Druckraum mit einer Auslaßöffnung auf­weist;
- das Pumpengehäuse ist mit einem ebenfalls wasserdicht ausge­bildeten, die Antriebseinrichtung aufnehmenden Motorgehäuse verbunden, das einen Motorraum einschließt, der gegenüber dem Pumpengehäuse über einen ersten Trennwandbereich flüs­sigkeitsdicht abgeteilt ist;
- im ersten Trennwandbereich sind die motorseitigen Lager der Pumpenwelle bzw. -spindel sowie deren Dichtungen zur Abdich­tung zwischen Motor- und Pumpenraum angeordnet, wobei diese Dichtungen pumpenseitig mit dem Pumpenraum in Verbindung stehen und somit vom Fördermedium beaufschlagt werden;
- der Motorraum ist mit Öl gefüllt, das zur Schmierung der Lager o.dergl. dient und die Wärme über das Motorgehäuse an dessen Umgebung abgibt;
- ein Druckausgleichsraum weist zumindest eine sich bei zuneh­mender Druckbeaufschlagung verformbare Wandung auf.The invention relates to a delivery unit consisting of a pump with a drive device, in particular an electric motor,
- The pump is enclosed on all sides by a waterproof pump housing which has a suction chamber with a suction opening and a pressure chamber with an outlet opening;
- The pump housing is connected to a likewise watertight motor housing accommodating the drive device, which includes an engine compartment which is partitioned liquid-tight with respect to the pump housing via a first partition area;
- The motor-side bearings of the pump shaft or spindle and their seals for sealing between the motor and pump chamber are arranged in the first partition area, these seals being connected to the pump chamber on the pump side and thus being acted upon by the pumped medium;
- The engine compartment is filled with oil that o.dergl. serves and emits the heat to the environment via the motor housing;
- A pressure compensation space has at least one wall that can be deformed as the pressure is increased.

Unter der Bezeichnung "wasserdicht ausgebildetes Pumpengehäuse" wird ein Gehäuse verstanden, das abgesehen von der Ansaug- sowie der Auslaßöffnung keine einen Wassereintritt ermöglichende Öff­nung aufweist und unter Zwischenschaltung einer entsprechenden Dichtung mit dem Motorgehäuse verbunden ist.The term “waterproof pump housing” is understood to mean a housing which, apart from the suction opening and the outlet opening, has no opening which allows water to enter and is connected to the motor housing with the interposition of a corresponding seal.

Das vorstehend beschriebene Förderaggregat läßt sich der DE-OS 20 23 095 entnehmen. Vorbekannt war demnach ein elektri­sches Tauchpumpenaggregat, bei dem der genannte erste Trennwand­bereich den Motorraum gegenüber dem Pumpen-Druckraum abteilt, so daß die Dichtungen der Pumpenwelle pumpenseitig mit dem Druckraum in Verbindung stehen. Das im Motorraum befindliche Öl beauf­schlagt ausschließlich die Lager der Pumpenwelle, während deren pumpenseitigen Dichtungen mit Öl aus einer separaten Ölkammer be­aufschlagt werden, die zwischen Motorraum und Pumpen-Druckraum angeordnet ist, durch eine Gummimembran vom Motorraum abgetrennt ist und unabhängig von der Ölfüllung im Motorraum über eine eigene Einfüllschraube mit Öl gefüllt wird. Um dem im Motorraum befindlichen Öl eine Ausdehnungsmöglichkeit zu geben, ist das Motorgehäuse auf seiner dem ersten Trennwandbereich abgewandten Seite über eine Gummimembran abgeschlossen, die den Motorraum von einer Kammer trennt, in der die gesamte elektrische Instal­lation untergebracht ist. Aufgrund der nachgiebigen Ausbildung der genannten Gummimembran ist für das Öl im Motor bei einer Er­wärmung eine Ausdehnungsmöglichkeit gegeben, indem sich die Gum­mimembran in die genannte Kammer hinein verformt.The delivery unit described above can be found in DE-OS 20 23 095. Accordingly, an electric submersible pump unit was previously known, in which said first partition area divides the engine compartment from the pump pressure compartment, so that the seals of the pump shaft are connected to the pressure compartment on the pump side. The oil in the engine compartment only acts on the bearings of the pump shaft, while the seals on the pump side are loaded with oil from a separate oil chamber, which is arranged between the engine compartment and the pump pressure compartment, is separated from the engine compartment by a rubber membrane and is independent of the oil filling in the engine compartment a separate filler plug is filled with oil. In order to give the oil in the engine compartment an opportunity to expand, the engine housing on its side facing away from the first partition area is closed off by a rubber membrane which separates the engine compartment from a chamber in which the entire electrical installation is housed. Due to the resilient design of the above-mentioned rubber membrane, there is an expansion possibility for the oil in the engine when it is heated, by the rubber membrane deforming into the chamber mentioned.

Die DE-OS 22 13 620 offenbart ein Pumpaggregat mit einem Elektro­motor für den Unterwasserbetrieb, insbesondere für Abwasseranla­gen, bei dem der Motor in einer wasserdichten Kapsel mit abge­dichteter Stromzuführung sitzt. Dabei ist die Kapsel als das Mo­torgehäuse umgebende Tauchglocke ausgebildet, wobei die Hohlräume im Bereich des Elektromotors und innerhalb der Tauchglocke im we­sentlichen ganz mit Öl gefüllt sind. Die Ölfüllung innerhalb der Tauchglocke und im Motorgehäuse sorgt für die Schmierung des Mo­tors und leitet gleichzeitig die im Bereich der Motorwicklungen und der drehenden Teile entstehende Wärme nach außen ab. Zur Kom­pensation einer Wärmeausdehnung dieser Ölfüllung sind im ölge­füllten Bereich komprimierbare Körper vorgesehen.DE-OS 22 13 620 discloses a pump unit with an electric motor for underwater operation, in particular for sewage systems, in which the motor sits in a waterproof capsule with a sealed power supply. The capsule is designed as a diving bell surrounding the motor housing, the cavities in the area of the electric motor and inside the diving bell being essentially completely filled with oil. The oil filling inside the diving bell and in the motor housing ensures the lubrication of the motor and at the same time dissipates the heat generated in the area of the motor windings and the rotating parts to the outside. Compressible bodies are provided in the oil-filled area to compensate for thermal expansion of this oil filling.

Die DE-OS 32 45 973 offenbart ein Motorpumpenaggregat, bestehend aus einer Schraubenspindelpumpe und einem daran druckseitig ange­ordneten Spaltrohrmotor, der an den Druckraum der Pumpe an­schließt, wobei die Motor-Pumpenantriebswelle zwischen dem Pum­penteil und dem Motorteil gelagert ist.DE-OS 32 45 973 discloses a motor pump assembly consisting of a screw pump and a canned motor arranged thereon on the pressure side, which connects to the pressure chamber of the pump, the motor pump drive shaft being mounted between the pump part and the motor part.

Der Erfindung liegt die Aufgabe zugrunde, das eingangs beschrie­bene Förderaggregat so auszubilden, daß es sich unter Wasser, insbesondere auch in großen Tiefen sowie bei wechselnder Druckbe­aufschlagung des Saugraumes vom Fördermedium einsetzen läßt.The invention has for its object to design the delivery unit described above so that it can be used under water, especially at great depths and with changing pressurization of the suction chamber of the medium.

Diese Aufgabe wird gemäß der Erfindung in Verbindung mit den ein­gangs aufgeführten Merkmalen durch folgende zusätzliche Merkmale gelöst:

  • a) Der Motorraum ist gegenüber dem druckbeaufschlagten Saugraum über den ersten Trennwandbereich abgeteilt;
  • b) die Dichtungen der Pumpenwelle bzw. -spindel stehen pumpen­seitig mit dem Saugraum in Verbindung;
  • c) das im Motorraum befindliche Öl beaufschlagt die Dichtungen der Pumpenwelle bzw. -spindel;
  • d) der Druckausgleichsraum steht in flüssigkeitsaustauschender Verbindung mit dem Saugraum und verformt sich mit seiner verformbaren Wandung in den mit Öl gefüllten Motorraum hinein.
This object is achieved according to the invention in connection with the features listed at the outset by the following additional features:
  • a) The engine compartment is separated from the pressurized suction compartment via the first partition area;
  • b) the seals of the pump shaft or spindle are connected to the suction chamber on the pump side;
  • c) the oil in the engine compartment acts on the seals of the pump shaft or spindle;
  • d) the pressure equalization chamber is in fluid communication with the suction chamber and deforms with its deformable wall into the engine compartment filled with oil.

Dabei ist es zweckmäßig, wenn die der Antriebseinheit abgewand­ten Lager der Pumpenwelle bzw. -spindel sowie deren Dichtungen in einem zweiten Trennwandbereich angeordnet sind, der den ge­nannten Saugraum flüssigkeitsdicht abteilt gegenüber einem was­serdicht ausgebildeten, mit Öl gefüllten Schmierraum, der mit dem Motorraum in ölaustauschender Verbindung steht, wobei diese Dichtungen pumpenseitig mit dem Saugraum in Verbindung stehen und somit vom Fördermedium beaufschlagt werden, während das Öl zur Schmierung der Lager dient, die Dichtungen beaufschlagt und die Wärme über das Schmierraumgehäuse abgibt.It is expedient if the bearings of the pump shaft or spindle facing away from the drive unit and their seals are arranged in a second partition area, which divides the suction chamber in a liquid-tight manner compared to a watertight, oil-filled lubrication chamber which communicates with the engine compartment in an oil-exchanging manner stands, these seals are on the pump side in connection with the suction chamber and are thus acted upon by the pumped medium, while the oil is used for lubrication of the bearings, the seals acted on and emits the heat via the lubricating chamber housing.

Die gewählten Bezeichnungen Saugraum und Druckraum gelten nur für eine bestimmte Drehrichtung der Pumpe. Bei einer Drehrich­tungsumkehr wird der vorstehend genannte Saugraum zum Druckraum und umgekehrt der vorstehend erwähnte Druckraum zum Saugraum, wobei dann die vorstehend genannte Auslaßöffnung die Ansaug­öffnung und die vorstehend erwähnte Ansaugöffnung die Auslaß­öffnung darstellen. Die Wirkung des Druckausgleichs bleibt da­durch unverändert.The selected designations suction chamber and pressure chamber apply only to a certain direction of rotation of the pump. When the direction of rotation is reversed, the above-mentioned suction chamber becomes the pressure chamber and vice versa the above-mentioned pressure chamber becomes the suction chamber, in which case the above-mentioned outlet opening represents the suction opening and the above-mentioned suction opening the outlet opening. The effect of the pressure equalization remains unchanged.

Bei der erfindungsgemäßen Lösung kann auf eine dynamische Ab­dichtung zu dem Umgebungsmedium verzichtet werden.In the solution according to the invention, dynamic sealing to the surrounding medium can be dispensed with.

Zur Erhöhung der Wärmeabfuhr aus dem Öl ist es vorteilhaft,wenn die den genannten Schmierraum mit dem Motorraum verbindende Öl­leitung durch den genannten Saugraum geführt ist.To increase the heat dissipation from the oil, it is advantageous if the oil line connecting the lubrication chamber to the engine compartment is led through the suction chamber.

Erfindungsgemäß wird somit erreicht, daß sich der unter Umstän­den sehr hohe Druck des sich im Saugraum befindlichen Förderme­diums in dem genannten Druckausgleichsraum ausbreitet und hier dazu führt, daß sich zumindest eine Wandung dieses Druckaus­gleichsraumes in den Motorraum hinein verformt und dadurch des­sen Ölfüllung druckbeaufschlagt. Dabei kann der Druckausgleichs­raum durch eine im Motorraum angeordnete gummielastische Blase o.dergl. gebildet sein. Wesentlich ist, daß der im Saugraum herrschende Druck danach trachtet, das Volumen des vom Öl ge­füllten Motorraumes zu verringern und dadurch die Ölfüllung un­ter entsprechendem Druckanstieg zu komprimieren versucht, bis sich ein Druckausgleich zwischen dem Druck im Saugraum und dem im Motorraum einstellt. An den Dichtungen der Pumpenspindeln im Bereich der beiden genannten Trennwandbereiche treten daher nur sehr geringe Druckgefälle auf, so daß das Eindringen von Förder­medium in die Ölfüllung verhindert und eine hohe Standzeit der Dichtungen gewährleistet werden.According to the invention it is thus achieved that the possibly very high pressure of the pumping medium located in the suction chamber spreads in the said pressure compensation chamber and here leads to the fact that at least one wall of this pressure compensation chamber deforms into the engine compartment and thereby pressurizes its oil filling. The pressure compensation chamber can be arranged in the engine compartment by a rubber-elastic bladder or the like. be educated. It is essential that the pressure prevailing in the suction space seeks to reduce the volume of the engine compartment filled with oil and thereby tries to compress the oil filling with a corresponding pressure increase until a pressure equalization between the pressure in the suction compartment and that in the engine compartment occurs. Therefore, only very slight pressure drops occur on the seals of the pump spindles in the area of the two partition wall areas mentioned, so that the penetration of the medium is prevented and a long service life of the seals is ensured.

Weitere Vorteile der Erfindung sind Gegenstand der Unteransprü­che und werden in Verbindung mit weiteren Vorteilen der Erfin­dung anhand eines Ausführungsbeispieles näher erläutert.Further advantages of the invention are the subject of the dependent claims and are explained in more detail in connection with further advantages of the invention using an exemplary embodiment.

In der Zeichnung ist eine als Beispiel dienende Ausführungsform der Erfindung dargestellt. Es zeigen:

  • Figur 1 im Längsschnitt ein Förderaggregat und
  • Figur 2 in vergrößertem Maßstab einen Ausschnitt der Figur 1.
In the drawing, an exemplary embodiment of the invention is shown. Show it:
  • Figure 1 in longitudinal section a conveyor unit
  • 2 shows a detail of FIG. 1 on an enlarged scale.

Das dargestellte Förderaggregat besteht aus einer Pumpe 1 mit einer Antriebseinrichtung 2, wobei die Pumpe eine Schraubenspin­delpumpe sein kann, deren Ausführungsform der der nicht vorver­öffentlichten europäischen Patentanmeldung Nr. 86113623.2 ent­spricht. Die Antriebseinrichtung 2 kann ein KSB-Elektromotor sein, wobei der gekapselt ausgeführte Motor eine Wasserfüllung 3 aufweist, die mit einem Druckausgleichsbehälter 4 in Verbindung steht.The pumping unit shown consists of a pump 1 with a drive device 2, the pump being a screw pump, the embodiment of which corresponds to that of the unpublished European patent application No. 86113623.2. The drive device 2 can be a KSB electric motor, the encapsulated motor having a water filling 3, which is connected to a pressure expansion tank 4.

Die Pumpe 1 sitzt in einem wasserdicht ausgebildeten Pumpenge­häuse 5, das eine in einen Saugraum 6 mündende Ansaugöffnung 7 aufweist. Dieses Pumpengehäuse 5 ist mit einem ebenfalls wasser­dicht ausgebildeten, die Antriebseinrichtung 2 aufnehmenden Motorgehäuse 8 verbunden, das einen die gekapselte Antriebsein­heit 2 umgebenden Motorraum 9 einschließt, der gegenüber dem ge­nannten Saugraum 6 über einen ersten Trennwandbereich 10 flüs­sigkeitsdicht abgeteilt ist. Auf der der Antriebseinheit 2 abge­wandten Seite weist das Pumpengehäuse 5 einen zweiten Trennwand­bereich 11 auf, der den genannten Saugraum 6 flüssigkeitsdicht abteilt gegenüber einem Schmierraum 12.The pump 1 is seated in a watertight pump housing 5 which has a suction opening 7 opening into a suction chamber 6. This pump housing 5 is connected to a likewise watertight motor housing 8 which accommodates the drive device 2 and which encloses a motor chamber 9 which surrounds the encapsulated drive unit 2 and which is partitioned in a liquid-tight manner with respect to said suction chamber 6 via a first partition wall region 10. On the side facing away from the drive unit 2, the pump housing 5 has a second partition wall area 11, which divides the aforementioned suction chamber 6 in a liquid-tight manner with respect to a lubrication chamber 12.

Im ersten und zweiten Trennwandbereich 10, 11 sind die Lager 13, 14 der beiden Pumpenspindeln 15,16 sowie deren Dichtungen 17,18 angeordnet. Ferner ist motorseitig vom ersten Trennwandbe­reich 10 eine Zahnradpumpe 19 angeordnet, die zugleich die Dreh­verbindung zwischen den beiden Pumpenspindeln 15,16 herstellt. Der Antrieb der Pumpenspindel 15 erfolgt über eine Kupplung 20.The bearings 13, 14 of the two pump spindles 15, 16 and their seals 17, 18 are arranged in the first and second partition wall regions 10, 11. Furthermore, a gear pump 19 is arranged on the motor side of the first partition wall area 10, which at the same time establishes the rotary connection between the two pump spindles 15, 16. The pump spindle 15 is driven via a clutch 20.

Im Motorraum 9 ist eine gummielastische Blase 21 angeordnet, die einen Druckausgleichsraum 22 umschließt, der in flüssigkeitsaus­tauschender Verbindung steht mit dem Saugraum 6.A rubber-elastic bladder 21 is arranged in the engine compartment 9, which encloses a pressure compensation compartment 22, which is in fluid communication with the suction compartment 6.

Der Motorraum 9 ist mit Öl gefüllt und steht mit dem Schmier­raum 12 über eine durch den Saugraum 6 geführte Ölleitung 23 in Verbindung. Zur Erzeugung einer mit dem Pfeilen 24 gekennzeich­neten Ölzirkulation saugt die vorstehend erwähnte Zahnradpum­pe 19 Öl aus dem Motorraum 9 an und drückt es über die Öllei­tung 23 in den Schmierraum 12, aus dem es über die angedeutete Ölrücklaufleitung 25 in den Motorraum 9 zurückströmt. Das Öl be­aufschlagt die motorseitige Dichtungen 17 motorseitig über Ka­näle 26 und die der Antriebseinheit 2 abgewandten Dichtungen 18 von dem Schmierraum 12 her über Kanäle 27. Auf der gegenüber­liegenden Seite werden die Dichtungen 17,18 jeweils von dem im Saugraum 6 befindlichen Fördermedium beaufschlagt. Das Öl dient somit zur Schmierung der Lager 13,14 sowie der Zahnräder 19, zur Beaufschlagung der Dichtungen 17,18 sowie zur Wärmeabfuhr, wobei die Wärme über das Motorgehäuse 8 an dessen Umgebung abgegeben wird.The engine compartment 9 is filled with oil and communicates with the lubrication compartment 12 via an oil line 23 guided through the suction compartment 6. To generate an oil circulation identified by the arrows 24, the aforementioned gear pump 19 sucks oil from the engine compartment 9 and presses it via the oil line 23 into the lubrication chamber 12, from which it flows back into the engine compartment 9 via the indicated oil return line 25. The oil acts on the engine side seals 17 on the engine side via channels 26 and the seals 18 facing away from the drive unit 2 from the lubrication chamber 12 via channels 27. On the opposite side, the seals 17, 18 are each acted upon by the pumping medium located in the suction chamber 6. The oil thus serves to lubricate the bearings 13, 14 and the gear wheels 19, to act on the seals 17, 18 and to dissipate heat, the heat being emitted to the environment via the motor housing 8.

Das dargestellte Förderaggregat ist insbesondere geeignet zum Einsatz unter Wasser und zwar auch in großen Tiefen, wobei die Ansaugöffnung 7 dann an eine Ölbohrung o.dergl. angeschlossen werden kann. Das Fördermedium ist dann ein Multiphasen-Gemisch aus Erdöl, Sedimenten, Seewasser und Erdgas und wird unter ent­sprechender Druckerhöhung aus der Auslaßöffnung 28 in eine För­derleitung o.dergl. gedrückt. Das Fördermedium kann somit be­reits im Saugraum 6 einen hohen Druck aufweisen, der dann auch im Druckausgleichsraum 22 der Blase 21 herrscht, die sich unter Einwirkung ihres Innendrucks nach außen zu verformen bzw. aus­zudehnen versucht. Dadurch erfolgt eine Druckbeaufschlagung der Ölfüllung innerhalb des Motorraumes 9 bzw. des Schmierraumes 12, so daß sich an den Dichtungen 17,18 nur sehr geringe Druckdif­ferenzen zwischen Saugraum 6 und Motorraum 9 bzw. Schmierraum 12 einstellen. Diese Dichtungen, die z.B. Gleitringringdichtungen sein können, sind somit nur einem geringen Druckgefälle unter­worfen, so daß sich einerseits eine hohe Standfestigkeit der Dichtungen ergibt und andererseits ein Eindringen des Förder­mediums in die Ölfüllung verhindert wird.The pumping unit shown is particularly suitable for use under water and even at great depths, the suction opening 7 then or the like to an oil hole. can be connected. The pumped medium is then a multi-phase mixture of petroleum, sediments, sea water and natural gas and is or the like with a corresponding pressure increase from the outlet opening 28 into a delivery line. pressed. The pumped medium can thus already have a high pressure in the suction chamber 6, which then also prevails in the pressure compensation chamber 22 of the bladder 21, which attempts to deform or expand outwards under the influence of its internal pressure. This results in pressurization of the oil filling within the engine compartment 9 or the lubrication compartment 12, so that only very small pressure differences between the suction compartment 6 and the engine compartment 9 or the lubrication compartment 12 occur at the seals 17, 18. These seals, for example mechanical seals can only be subjected to a slight pressure drop, so that on the one hand there is a high level of stability of the seals and on the other hand penetration of the pumped medium into the oil filling is prevented.

Das erfindungsgemäße Förderaggregat kann, wie die Zeichnung er­kennen läßt, in einem kompakten Gehäuse untergebracht werden, das mittig geteilt ist und einen oberen sowie einen unteren Ab­schlußdeckel aufweist, wobei diese Gehäuseteile gegeneinander geflanscht sein können. Der erste und zweite Trennwandbe­reich 10,11 können in das Gehäuse eingeschweißt sein. Das Ge­häuse kann an seinem oberen Ende mit einer Aufhängeeinrichtung und an seinem unteren Ende mit Standfüßen o.dergl. versehen sein. Der obere Deckel kann in vorteilhafter Weise das Schmier­raumgehäuse 29 bilden.The conveyor unit according to the invention can, as can be seen in the drawing, be accommodated in a compact housing which is divided in the middle and has an upper and a lower end cover, wherein these housing parts can be flanged against each other. The first and second partition regions 10, 11 can be welded into the housing. The housing can at its upper end with a suspension device and at its lower end with feet or the like. be provided. The upper cover can advantageously form the lubrication chamber housing 29.

Der mit der Auslaßöffnung 28 in Verbindung stehende Pumpendruck­raum ist mit 30 bezeichnet und bildet bei Drehrichtungsumkehr den Saugraum, wobei dann der mit 6 bezeichnete Raum den Druck­raum, die Öffnung 28 die Ansaugöffnung und die Öffnung 7 die Auslaßöffnung bilden.The pump pressure chamber in connection with the outlet opening 28 is designated by 30 and forms the suction chamber when the direction of rotation is reversed, the space designated by 6 then forming the pressure chamber, the opening 28 forming the suction opening and the opening 7 forming the outlet opening.

In einer abgewandelten, in der Zeichnung nicht näher dargestell­ten Ausführungsform könnte die Antriebseinrichtung 2 auch außer­halb des Motorgehäuses 8 angeordnet sein. Das Gehäuse der An­triebseinrichtung könnte dann z.B. anstelle des in Figur 1 ge­zeigten unteren Gehäusedeckels an das Motorgehäuse 8 ange­flanscht sein, wobei dann das in Figur 1 dargestellte Motorge­häuse 8 sehr viel kleiner ausgebildet werden könnte.In a modified embodiment, not shown in the drawing, the drive device 2 could also be arranged outside the motor housing 8. The housing of the drive device could then e.g. be flanged to the motor housing 8 instead of the lower housing cover shown in FIG. 1, in which case the motor housing 8 shown in FIG. 1 could be made much smaller.

Claims (6)

1. Förderaggregat bestehend aus einer Pumpe (1) mit einer An­triebseinrichtung (2), insbesondere einem Elektromotor,
- die Pumpe (1) ist allseitig von einem wasserdicht aus­gebildeten Pumpengehäuse (5) umschlossen, das einen Saugraum (6) mit einer Ansaugöffnung (7) und einen Druckraum (30) mit einer Auslaßöffnung (28) aufweist;
- das Pumpengehäuse (5) ist mit einem ebenfalls wasser­dicht ausgebildeten, die Antriebseinrichtung (2) auf­nehmenden Motorgehäuse (8) verbunden, das einen Motor­raum (9) einschließt, der gegenüber dem Pumpengehäuse über einen ersten Trennwandbereich (10) flüssigkeits­dicht abgeteilt ist;
- im ersten Trennwandbereich (10) sind die motorseitigen Lager (13) der Pumpenwelle bzw. -spindel (15,16) sowie deren Dichtungen (17) zur Abdichtung zwischen Motor­und Pumpenraum (9,6) angeordnet, wobei diese Dichtungen (17) pumpenseitig mit dem Pumpenraum (6) in Verbindung stehen und somit vom Fördermedium beaufschlagt werden;
- der Motorraum (9) ist mit Öl gefüllt, das zur Schmie­rung der Lager (13,14) o.dergl. dient und die Wärme über das Motorgehäuse (8) an dessen Umgebung abgibt;
- ein Druckausgleichsraum (22) weist zumindest eine sich bei zunehmender Druckbeaufschlagung verformbare Wandung auf;
gekennzeichnet durch folgende Merkmale: a) der Motorraum (9) ist gegenüber dem druckbeaufschlagten Saugraum (6) über den ersten Trennwandbereich (10) ab­geteilt; b) die Dichtungen (17) der Pumpenwelle bzw. -spindel (15, 16) stehen pumpenseitig mit dem Saugraum (6) in Verbin­dung; c) das im Motorraum (9) befindliche Öl beaufschlagt die Dichtungen (17,18) der Pumpenwelle bzw. -spindel (15, 16); d) der Druckausgleichsraum (22) steht in flüssigkeitsaus­tauschender Verbindung mit dem Saugraum (6) und ver­formt sich mit seiner verformbaren Wandung in den mit Öl gefullten Motorraum (9) hinein. 1. delivery unit consisting of a pump (1) with a drive device (2), in particular an electric motor,
- The pump (1) is enclosed on all sides by a waterproof pump housing (5) which has a suction chamber (6) with a suction opening (7) and a pressure chamber (30) with an outlet opening (28);
- The pump housing (5) is connected to a likewise watertight motor housing (8) which accommodates the drive device (2) and which includes an engine compartment (9) which is partitioned liquid-tight with respect to the pump housing via a first partition wall region (10);
- In the first partition area (10), the motor-side bearings (13) of the pump shaft or spindle (15, 16) and their seals (17) for sealing between the motor and pump chamber (9, 6) are arranged, these seals (17) on the pump side are in connection with the pump chamber (6) and are thus acted upon by the pumped medium;
- The engine compartment (9) is filled with oil for lubricating the bearings (13, 14) or the like. serves and gives off the heat to the surroundings via the motor housing (8);
- A pressure equalization space (22) has at least one wall that can be deformed as the pressure is increased;
characterized by the following features: a) the engine compartment (9) is separated from the pressurized suction compartment (6) via the first partition area (10); b) the seals (17) of the pump shaft or spindle (15, 16) are connected to the suction chamber (6) on the pump side; c) the oil in the engine compartment (9) acts on the seals (17, 18) of the pump shaft or spindle (15, 16); d) the pressure compensation chamber (22) is in fluid-exchanging connection with the suction chamber (6) and deforms with its deformable wall into the engine compartment (9) filled with oil. 2. Förderaggregat nach Anspruch 1, dadurch gekennzeichnet, daß die der Antriebseinheit (2) abgewandten Lager (14) der Pum­penwelle bzw. -spindel (15,16) sowie deren Dichtungen (18) in einem zweiten Trennwandbereich (11) angeordnet sind, der den genannten Saugraum (6) flüssigkeitsdicht abteilt gegen­über einem wasserdicht ausgebildeten, mit Öl gefüllten Schmierraum (12), der mit dem Motorraum (9) in ölaus­ tauschender Verbindung steht, wobei diese Dichtungen (18) pumpenseitig mit dem Saugraum (6) in Verbindung stehen und somit vom Fördermedium beaufschlagt werden, während das Öl zur Schmierung der Lager (14) dient, die Dichtungen (18) be­aufschlagt und die Wärme über das Schmierraumgehäuse (29) abgibt.2. Delivery unit according to claim 1, characterized in that the drive unit (2) facing away from the bearing (14) of the pump shaft or spindle (15, 16) and their seals (18) are arranged in a second partition area (11) divides said suction chamber (6) in a liquid-tight manner compared to a watertight, oil-filled lubricating chamber (12), which is in oil-free with the engine compartment (9) is a swapping connection, these seals (18) on the pump side are connected to the suction chamber (6) and are thus acted upon by the pumped medium, while the oil is used to lubricate the bearings (14), the seals (18) act and the heat via the Releases lubrication chamber housing (29). 3. Förderaggregat nach Anspruch 2, dadurch gekennzeichnet, daß zur Erzielung einer Ölzirkulation (24) motorseitig vom ersten Trennwandbereich (10) eine Zahnradpumpe (19) angeord­net ist.3. Delivery unit according to claim 2, characterized in that a gear pump (19) is arranged on the motor side of the first partition area (10) to achieve an oil circulation (24). 4. Förderaggregat nach Anspruch 2 oder 3, dadurch gekennzeich­net, daß die den genannten Schmierraum (12) mit dem Motor­raum (9) verbindende Ölleitung (23) durch den genannten Saugraum (6) geführt ist.4. Delivery unit according to claim 2 or 3, characterized in that the said lubricating chamber (12) with the engine compartment (9) connecting oil line (23) is guided through said suction chamber (6). 5. Förderaggregat nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß der genannte Druckausgleichs­raum (22) durch eine im Motorraum (9) angeordnete gummi­elastische Blase (21) o.dergl. gebildet ist.5. Conveyor unit according to one of the preceding claims, characterized in that said pressure equalization chamber (22) or the like by a rubber-elastic bladder (21) arranged in the engine compartment (9). is formed. 6. Förderaggregat nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß die genannten Dichtungen (17,18) mechanische Dichtungen, vorzugsweise Gleitringdichtungen sind.6. Conveyor unit according to one of the preceding claims, characterized in that said seals (17, 18) are mechanical seals, preferably mechanical seals.
EP88108221A 1987-06-29 1988-05-24 Transfer arrangement consisting of a pump with a driving device Expired - Lifetime EP0297274B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3721398 1987-06-29
DE19873721398 DE3721398A1 (en) 1987-06-29 1987-06-29 CONVEYOR UNIT CONSISTING OF A PUMP WITH A DRIVE DEVICE

Publications (3)

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EP0297274A2 true EP0297274A2 (en) 1989-01-04
EP0297274A3 EP0297274A3 (en) 1989-10-18
EP0297274B1 EP0297274B1 (en) 1991-02-27

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EP88108221A Expired - Lifetime EP0297274B1 (en) 1987-06-29 1988-05-24 Transfer arrangement consisting of a pump with a driving device

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EP (1) EP0297274B1 (en)
DE (2) DE3721398A1 (en)
NO (1) NO164122C (en)

Cited By (8)

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WO1991003647A1 (en) * 1989-09-08 1991-03-21 Multiphase Systems Plc Improvements in pumps
DE4100135C1 (en) * 1991-01-04 1992-05-14 Loher Ag, 8399 Ruhstorf, De
EP0548733A2 (en) * 1991-12-23 1993-06-30 Loher Aktiengesellschaft Electric motor applicable for submerged running
DE4209118A1 (en) * 1991-12-23 1993-07-01 Loher Ag ELECTRIC MOTOR
EP0810717A2 (en) * 1996-05-31 1997-12-03 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Electrohydraulic motor pump unit
WO1998053182A1 (en) * 1997-05-20 1998-11-26 Westinghouse Government Services Company Llc Sub-sea pumping system and associated method
WO2010126651A3 (en) * 2009-04-30 2011-03-31 General Electric Company Method and apparatus for lubricating a screw pump system
US10711799B2 (en) 2012-05-09 2020-07-14 Nuovo Pignone Srl Pressure equalizer

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
DE102008018407B4 (en) 2008-04-10 2012-03-22 Joh. Heinr. Bornemann Gmbh Underwater delivery unit
DE102010026239B4 (en) 2010-06-29 2012-05-31 Joh. Heinr. Bornemann Gmbh Underwater delivery unit with a pump and a drive device
DE102012003066B3 (en) * 2012-02-17 2013-07-04 Netzsch Pumpen & Systeme Gmbh METHOD AND DEVICE FOR FIXING AND SYNCHRONIZING TURNING PISTONS IN A ROTARY PISTON PUMP

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DE2023095A1 (en) * 1970-05-12 1971-12-02 Albert Blum Electric submersible pump unit
DE3245973A1 (en) * 1982-12-11 1984-06-14 Allweiler Ag, 7760 Radolfzell ENGINE PUMP UNIT
DE3344765A1 (en) * 1983-12-10 1985-06-13 Vdo Adolf Schindling Ag, 6000 Frankfurt Submerged pump

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DE2213620A1 (en) * 1972-03-21 1973-09-27 Lederle Pumpen & Maschf PUMP UNIT FOR UNDERWATER OPERATION

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DE2023095A1 (en) * 1970-05-12 1971-12-02 Albert Blum Electric submersible pump unit
DE3245973A1 (en) * 1982-12-11 1984-06-14 Allweiler Ag, 7760 Radolfzell ENGINE PUMP UNIT
DE3344765A1 (en) * 1983-12-10 1985-06-13 Vdo Adolf Schindling Ag, 6000 Frankfurt Submerged pump

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991003647A1 (en) * 1989-09-08 1991-03-21 Multiphase Systems Plc Improvements in pumps
DE4100135C1 (en) * 1991-01-04 1992-05-14 Loher Ag, 8399 Ruhstorf, De
US5341058A (en) * 1991-12-23 1994-08-23 Loher Ag Electric motor
DE4209118A1 (en) * 1991-12-23 1993-07-01 Loher Ag ELECTRIC MOTOR
DE4244644A1 (en) * 1991-12-23 1993-07-15 Loher Ag
EP0548733A3 (en) * 1991-12-23 1993-08-18 Loher Aktiengesellschaft Electric motor applicable for submerged running
EP0548733A2 (en) * 1991-12-23 1993-06-30 Loher Aktiengesellschaft Electric motor applicable for submerged running
EP0810717A2 (en) * 1996-05-31 1997-12-03 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Electrohydraulic motor pump unit
EP0810717A3 (en) * 1996-05-31 2000-11-22 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Electrohydraulic motor pump unit
WO1998053182A1 (en) * 1997-05-20 1998-11-26 Westinghouse Government Services Company Llc Sub-sea pumping system and associated method
AU749248B2 (en) * 1997-05-20 2002-06-20 Westinghouse Government Services Company Llc Sub-sea pumping system and associated method
CN1091831C (en) * 1997-05-20 2002-10-02 西屋行政管理服务有限责任公司 Sub-sea pumping system and associated method
WO2010126651A3 (en) * 2009-04-30 2011-03-31 General Electric Company Method and apparatus for lubricating a screw pump system
GB2481944A (en) * 2009-04-30 2012-01-11 Gen Electric Method and apparatus for lubricating a screw pump system
US10711799B2 (en) 2012-05-09 2020-07-14 Nuovo Pignone Srl Pressure equalizer

Also Published As

Publication number Publication date
NO882857D0 (en) 1988-06-28
EP0297274B1 (en) 1991-02-27
NO882857L (en) 1988-12-30
EP0297274A3 (en) 1989-10-18
DE3721398C2 (en) 1989-05-24
DE3861831D1 (en) 1991-04-04
DE3721398A1 (en) 1989-01-19
NO164122B (en) 1990-05-21
NO164122C (en) 1990-08-29

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