EP1893872B1 - Screw displacement pump - Google Patents

Screw displacement pump Download PDF

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Publication number
EP1893872B1
EP1893872B1 EP06753222A EP06753222A EP1893872B1 EP 1893872 B1 EP1893872 B1 EP 1893872B1 EP 06753222 A EP06753222 A EP 06753222A EP 06753222 A EP06753222 A EP 06753222A EP 1893872 B1 EP1893872 B1 EP 1893872B1
Authority
EP
European Patent Office
Prior art keywords
housing
screw
pressure
pump
pump housing
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.)
Active
Application number
EP06753222A
Other languages
German (de)
French (fr)
Other versions
EP1893872A1 (en
Inventor
Gerhard Rohlfing
Axel JÄSCHKE
Jens-Uwe Brandt
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.)
ITT Bornemann GmbH
Original Assignee
Joh Heinr Bornemann GmbH
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Publication date
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Publication of EP1893872A1 publication Critical patent/EP1893872A1/en
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Publication of EP1893872B1 publication Critical patent/EP1893872B1/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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086—Carter
    • 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
    • F04C13/001—Pumps for particular liquids
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/24—Rotary-piston machines or pumps of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions
    • F04C2/26—Rotary-piston machines or pumps of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions of internal-axis type
    • 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
    • F04C2210/00—Fluid
    • F04C2210/24—Fluid mixed, e.g. two-phase fluid
    • 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
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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
    • F04C2240/00—Components
    • F04C2240/50—Bearings
    • F04C2240/51—Bearings for cantilever assemblies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S418/00—Rotary expansible chamber devices
    • Y10S418/01—Non-working fluid separation

Definitions

  • the invention relates to a screw pump in single-flow, two-shaft design with an outer bearing of the two screw spindles and a pump housing which surrounds the screw spindles to form delivery chambers and the delivery chambers bounded by its inner circumferential surface outside, and a suction chamber for the medium to be sucked and a pressure chamber, which receives the medium pumped by the screw spindles.
  • Two-flow screw pumps have a housing which is divided into a suction chamber and a pressure chamber.
  • the feed screws run either directly in the housing or in a replaceable housing insert, which is inserted into the housing between the suction chamber and the pressure chamber.
  • the housing has the task of providing adequate pressure resistance for receiving the process pressure and, on the other hand, providing the shape and positional rigidity required to maintain the sealing gap tolerances necessary for the pressure increasing process between the conveying screws with one another and the conveying screws and the housing or the housing insert contactless running conveyor screws particularly high demands on the smallest possible sealing gaps to achieve high efficiency.
  • Screw pumps in two-shaft, double-flow design are technically very complicated, costly in production and maintenance and are therefore preferably used for larger flow rates, which are typically too large to promote single sources (single-well-boosting).
  • a screw pump for delivery fluids is known, which has a one-sided external storage for the conveyor screws.
  • the conveyor screws are enclosed by a housing which is integrally formed and flanged to a housing part in which the conveyor spindles are mounted this housing can be removed for maintenance. If the pump has to be serviced, it is necessary to separate it from the supply line at the inlet and outlet connection and install a completely new pump.
  • a screw pump can be disassembled and repaired on site, which is very time consuming.
  • having a pump assembly of several individual parts at the customer site has the disadvantage that a pump test with accurate determination of the performance data is not possible, so that in order to meet required performance parameters usually a complete pump replacement is required.
  • the EP 0 405 160 A1 describes a screw pump with arranged in the interior of a pump housing drive spindle and at least one axially parallel sealing spindle and with an inlet and an outlet for a zueuerndes of the spindles flow medium.
  • the spindles are surrounded by a tubular housing insert which, with the pump housing which surrounds it, delimits at least one annular space connected to the interior receiving the spindles by means of at least one opening.
  • Object of the present invention is therefore to provide a pump that is inexpensive to manufacture and maintain and is basically suitable for the promotion of multi-phase mixtures in the context of a single source funding.
  • the screw pump according to the invention in single-flow, two-shaft design with an external bearing of the two screw spindles and a pump housing which surrounds the screw spindles to form delivery chambers and limits the delivery chambers with its inner circumferential surface outside, and a suction chamber for the medium to be sucked and a pressure chamber, the by the screw spindles receives conveyed medium, provides that the pump housing is inserted in a pressure housing and fixed to the pressure housing, so that the pressure chamber, the pump housing at least partially surrounds.
  • the pressure chamber separation means for separating a subsidized multiphase mixture are provided in a gas phase and a liquid phase, so that the separated phases derived either separately or a part of the separated liquid phase over a Short circuit line can be returned from the pressure chamber to the suction chamber to provide a minimum of liquid within the pump housing, so that the screw spindles can be cooled and the gaps between the screw spindles and between the screw spindles and the pump housing can be sealed.
  • a development of the invention provides that the pump housing projects through the pressure housing, so that the pump housing has two bearing or bearing points in the pressure housing. It is provided that the pump housing is attached only on one side to the pressure housing, in particular screwed, while the not attached to the pressure housing end of the pump housing is mounted in a guide in the pressure housing.
  • the pump housing in the pressure housing is fixedly mounted on one side and slightly movable on the other side, wherein the small clearance between the pressure housing and the pump housing is sealed via at least one seal, so that no fluid from the pressure chamber through gaps in the Leadership can escape.
  • the small clearance within the guide in the pressure housing makes it possible that by the pressure prevailing in the pressure chamber no deformations occur within the pump housing, which could change the play between the screw spindles among themselves and between the screw spindles and the pump housing, but that the pump housing as a whole within the Pressure housing is slightly displaced
  • Another advantage of the embodiment according to the invention is the simpler manufacture of the pressure housing due to the lower requirements on the positional accuracy of the components, so that a cost-effective production of the pressure housing is possible.
  • the maintenance due to the complete removability of the pump housing, together with the screw spindles and the bearing unit is considerably simplified.
  • the pump housing is located within the pressure chamber, it is possible to form the short-circuit line within the pump housing, ie to establish a direct connection between the pump chamber and the suction chamber.
  • the short-circuit line dosed separated liquid phase is returned to the suction chamber, which, although sacrificing the efficiency of the pump with it, but allows for the use of the screw pump for pumping multi-phase mixtures, a much longer service life.
  • the pump housing may be arranged eccentrically in the pressure housing, on the one hand to facilitate the separation and the return of separated liquid phase through a short-circuit line to the suction side of the screw spindles and on the other hand pressure-dependent deformations of the pressure housing or not act on the bearing unit or the screw spindles that they produce a pressure-dependent deflection of the fferenspirtdeln opposite angular change of the bearing unit.
  • tension anchors for biasing the pressure housing relative to the screw spindle bearing can be arranged in the pressure housing so that a pressure-dependent angular change of the bearing unit can be set alternatively or in addition to the suitable positioning of the pump housing in the pressure housing and the choice of wall thickness and / or the use of materials can.
  • the suction chamber is formed in the pump housing, so that it can be optimally adapted to the conveyor screws with respect to the dimensioning and the fluidic design.
  • the pump housing forms part of the wall of the pressure chamber, so that the use of the pump housing is a part of the inner wall of the pressure chamber forms.
  • the pump housing is sealed to the pressure housing, with passages or flow channels are provided for the pumped medium through which the pumped medium is passed into the pressure chamber.
  • connection devices for supply lines or discharges are formed on the pressure housing, so that the pressure housing during maintenance of the pump does not have to be removed from the line network, which can be a considerable installation effort and avoid leakage problems by installing and removing complete pumps from the mains become.
  • a single-flow screw pump with two screw spindles 1, 2 is shown, consisting of mutually coupled via gears shafts 10, 20 and thereon fastened via screws rotors 11, 12.
  • the shafts 10, 20 are mounted in a bearing housing 19 and form a bearing unit 9, which is sealed against the medium to be conveyed.
  • the rotors 11, 12 are mounted in a pump housing 3, wherein the shell inner surface 3a of the pump housing 3, the rotors enclose 11, 12, so that are formed by the intermeshing rotors 11, 12 in conjunction with the lateral surface 3a delivery chambers 4, in which to be conveyed medium is conveyed from a suction chamber 5 into a pressure chamber 6 via connection channels 16. Both between the rotors 11, 12 and between the rotors 11, 12 and the lateral surface 3a there is a minimal game to keep the leak rate of the pump as low as possible.
  • the inner end of the pressure chamber 6 is realized via the outer wall of the pump housing 3, since the pump housing 3, the pressure housing 7 and thus the pressure chamber 6 protrudes.
  • the pump housing 3 is fastened by bolts 40 to a carrier plate 8, to which the bearing unit 9 is likewise fastened via bolts 41.
  • the support plate 8 in turn is coupled via tie rods 42 to the pressure housing 7, so that the pump housing 3 via the bolts 40, the support plate 8 and the tie rods 42 is fixed on one side to the pump housing 7.
  • the pump housing 3 is provided in the region of the bolts 40 with an annular flange 37 which is insertable into a correspondingly formed recess 27 of the pump housing 7.
  • the support plate 8 facing away from the end 30 of the pump housing 3 is mounted in a recess 17 of the pump housing 7, but not screwed there, but only sealed by a seal 27.
  • a further seal is sealed by means of a front plate 15, which has a through-opening 25 for introducing a pumped medium into the suction chamber 5.
  • Also threaded 26 are provided for receiving connection means or leads in the end plate 15.
  • the one-sided mounting of the pump housing 3 to the pressure housing 7 has the advantage that the modular design combination of the pump housing 3, the bearing unit 9 and the conveyor spindles 1, 2 disposed therein is decoupled from pressure deformation of the pressure housing 7.
  • the pressure housing 7 can be designed for the respective system design pressure and in principle be made arbitrarily large, wherein only the recesses 17, 27 and connection devices must be designed so that the corresponding conveyor units or conveyor modules can be mounted from pump housing 3 and bearing unit 9.
  • flanges 14 are further provided for the derivatives, which can remain permanently installed.
  • separation means for the separation of gas phase and liquid phase may be provided in the promotion of multi-phase mixtures. These may be baffles or calming zones for generating a flow velocity near zero, wherein at such locations a short-circuit line 13 is preferably provided, which connects the suction chamber 5 with the pressure chamber 6.
  • the short-circuit line 13 is formed in the pump housing 3 and arranged on the bottom, so that in the lower part of the annular pressure chamber 6 located liquid that is filled to the pump housing 3, sucked into the suction chamber 5 and there by the rotors 11, 12 moved through can be. This causes heat transfer, sealing and lubrication of the rotors 11, 12.
  • the illustrated embodiment is particularly suitable to ensure safe operation of the pump even at very different wellhead pressures that can rise from quasi-atmospheric pressures to over 100 bar.
  • inlet opening 25 or in front of pump protection filters may be integrated or arranged to retain unwanted particles and to avoid damage to the rotors 11, 12.

Abstract

A screw displacement pump is provided. The screw displacement pump is of single-entry, double-shaft construction with an external bearing of the two screw shafts. A pump housing encloses the screw shafts by forming feed chambers and externally delimiting the feed chambers with its internal shell surface, as well as a suction chamber for the medium to be induced and a pressure chamber to accommodate the medium pumped by the screw shafts. The pump housing is inserted into a pressure housing and attached to the pressure housing, so that the pressure chamber encloses the pump, at least in part.

Description

Die Erfindung betrifft eine Schraubenspindelpumpe in einflutiger, zweiwelliger Bauweise mit einer Außenlagerung der beiden Schraubenspindeln und einem Pumpengehäuse, das die Schraubenspindeln unter Bildung von Förderkammern umschließt und die Förderkammern mit seiner inneren Mantelfläche außen begrenzt, sowie einem Saugraum für das zu anzusaugende Medium und einem Druckraum, der das durch die Schraubenspindeln geförderte Medium aufnimmt.The invention relates to a screw pump in single-flow, two-shaft design with an outer bearing of the two screw spindles and a pump housing which surrounds the screw spindles to form delivery chambers and the delivery chambers bounded by its inner circumferential surface outside, and a suction chamber for the medium to be sucked and a pressure chamber, which receives the medium pumped by the screw spindles.

Es sind viele Schraubenspindelpumpenkonzepte bekannt, beispielsweise eine zweiwellige, zweiflutige Ausgestaltung gemäß der EP 0 699 276 B1 , die insbesondere zur Förderung von unbehandelten Erdöl-Wasser-Gas-Gemischen eingesetzt wird, die aus einer sehr großen Quelle oder aus vielen, zum Teil über 500 kleinen Quellen austreten. Zweiflutige Schraubenspindelpumpen weisen ein Gehäuse auf, das in einen Saugraum und einen Druckraum unterteilt ist. Die Förderschrauben laufen dabei entweder direkt in dem Gehäuse oder in einem austauschbaren Gehäuseeinsatz, der in das Gehäuse zwischen den Saugraum und den Druckraum eingeschoben wird. Das Gehäuse hat dabei einerseits die Aufgabe, eine ausreichende Druckfestigkeit zur Aufnahme des Prozessdruckes bereitzustellen und andererseits die Form und Lagesteifigkeit zur Einhaltung der für den Druckerhöhungsprozess notwendigen Dichtspalt-Toleranzen zwischen den Förderschrauben untereinander und den Förderschrauben und dem Gehäuse bzw. dem Gehäuseeinsatz bereitzustellen, wobei die berührungslos laufenden Förderschrauben besonders hohe Anforderungen an die möglichst kleinen Dichtspalte stellen, um einen hohen Wirkungsgrad zu erzielen.There are many screw pump concepts known, for example, a two-shaft, two-flow design according to the EP 0 699 276 B1 , which is used in particular for the extraction of untreated oil-water-gas mixtures from a very large source or from many, sometimes over 500 small sources. Two-flow screw pumps have a housing which is divided into a suction chamber and a pressure chamber. The feed screws run either directly in the housing or in a replaceable housing insert, which is inserted into the housing between the suction chamber and the pressure chamber. On the one hand, the housing has the task of providing adequate pressure resistance for receiving the process pressure and, on the other hand, providing the shape and positional rigidity required to maintain the sealing gap tolerances necessary for the pressure increasing process between the conveying screws with one another and the conveying screws and the housing or the housing insert contactless running conveyor screws particularly high demands on the smallest possible sealing gaps to achieve high efficiency.

Schraubenspindelpumpen in zweiwelliger, zweiflutiger Ausführung sind technisch sehr aufwendig, in Herstellung und Wartung kostenintensiv und werden daher vorzugsweise für größere Förderleistungen eingesetzt, die typischerweise zur Förderung von Einzelquellen (Single-well-boosting) schon zu groß sind. Aus der DE 715860 B1 ist eine Schraubenpumpe für Förderflüssigkeiten bekannt, die eine einseitige Außenlagerung für die Förderschrauben aufweist. Die Förderschrauben werden von einem Gehäuse umschlossen, das einstückig ausgebildet und an einem Gehäuseteil angeflanscht ist, in dem die Förderspindeln gelagert sind Dieses Gehäuse kann für Wartungsarbeiten entfernt werden. Muss die Pumpe gewartet werden, ist es notwendig, diese an den Zu- und Ablaufstutzen aus der Förderleitung herauszutrennen und eine vollständig neue Pumpe einzubauen.Screw pumps in two-shaft, double-flow design are technically very complicated, costly in production and maintenance and are therefore preferably used for larger flow rates, which are typically too large to promote single sources (single-well-boosting). From the DE 715860 B1 a screw pump for delivery fluids is known, which has a one-sided external storage for the conveyor screws. The conveyor screws are enclosed by a housing which is integrally formed and flanged to a housing part in which the conveyor spindles are mounted this housing can be removed for maintenance. If the pump has to be serviced, it is necessary to separate it from the supply line at the inlet and outlet connection and install a completely new pump.

Alternativ zu einem Komplettaustausch kann eine Schraubenspindelpumpe vor Ort zerlegt und repariert werden, was sehr zeitaufwendig ist. Zudem hat eine Pumpenmontage aus mehreren Einzelteilen bei Kunden vor Ort den Nachteil, dass ein Pumpentest mit genauer Ermittlung der Leistungsdaten nicht möglich ist, so dass zur Erfüllung geforderter Leistungsparameter in der Regel ein kompletter Pumpemaustausch erforderlich ist.As an alternative to a complete replacement, a screw pump can be disassembled and repaired on site, which is very time consuming. In addition, having a pump assembly of several individual parts at the customer site has the disadvantage that a pump test with accurate determination of the performance data is not possible, so that in order to meet required performance parameters usually a complete pump replacement is required.

Gerade bei Einzelquellenförderung kommt es zu starken Schwankungen in der Zusammensetzung des Fördermediums. In hohem Maße unvorhersehbar wechseln sich Zustände von 100%iger Flüssigkeitsförderung mit Phasen 100%iger Gasförderung ab, wobei die Phasen der 100%igen Gasförderung für Schraubenspindelpumpen besonders kritisch sind, da bei herkömmlichen Schraubenspindelpumpen nach einer gewissen Zeit einer Gasförderung die dichtende, kühlende und schmierende Flüssigkeit abtransportiert ist. Dieser Zustand führt zu einer Erwärmung der Förderschrauben und damit einhergehend zu einem Kontakt der Förderschraube miteinander und dem Fördergehäuse, was zu einem erhöhten Verschleiß, gegebenenfalls zum Stillstand der Pumpe führt. Die dadurch entstehenden Probleme bezüglich der Wartung vor Ort wurden bereits beschrieben.Especially with single source funding, there are strong fluctuations in the composition of the pumped medium. To a great extent unpredictably, states of 100% liquid transfer alternate with phases of 100% gas production, with the phases of 100% gas production being especially critical for screw pumps, since with conventional screw pumps after a certain time of gas production the sealing, cooling and lubricating Liquid is removed. This condition leads to a heating of the conveyor screws and concomitantly to a contact of the feed screw with each other and the conveyor housing, which leads to increased wear, possibly to a standstill of the pump. The resulting on-site maintenance issues have already been described.

Die EP 0 405 160 A1 beschreibt eine Schraubenspindelpumpe mit im Innenraum eines Pumpengehäuses angeordneter Antriebsspindel und wenigstens einer dazu achsparallelen Dichtspindel sowie mit einem Zulauf und einem Auslauf für ein von den Spindeln zuförderndes Strömungsmedium.The EP 0 405 160 A1 describes a screw pump with arranged in the interior of a pump housing drive spindle and at least one axially parallel sealing spindle and with an inlet and an outlet for a zuförderndes of the spindles flow medium.

Die Spindeln sind von einem rohrartigen Gehäuseeinsatz umgeben, der mit dem ihn umfangenden Pumpengehäuse wenigstens einen mit dem die Spindeln aufnehmenden Innenraum durch zumindest einen Durchbruch verbundenen Ringraum begrenzt.The spindles are surrounded by a tubular housing insert which, with the pump housing which surrounds it, delimits at least one annular space connected to the interior receiving the spindles by means of at least one opening.

Zur Förderung von Einzelquellen werden neben Schraubenspindelpumpen auch Exzenterschneckenpumpen eingesetzt, die jedoch zur Förderung von Multiphasengemischen nur bedingt tauglich sind, da deren 100%ige Gasförderfähigkeit aufgrund entstehender Reibungswärme zeitlich sehr begrenzt ist.To promote individual sources in addition to screw pumps and eccentric screw pumps are used, however, which are only suitable for the promotion of multi-phase mixtures, since their 100% gas capacity due to the resulting frictional heat is very limited in time.

Als Konsequenz aus der Überdimensionierung der Multiphasenpumpen in zweiwelliger, zweiflutiger Ausführung und in Ermangelung geeigneter Multiphasenpumpen mit geringeren Leistungen, werden weltweit Tausende von Ölquellen nicht oder nicht mehr gefördert, wodurch wertvolle Rohstoffe nicht genutzt werden.As a consequence of the oversizing of the multiphase pumps in two-shaft, double-flow design and the lack of suitable lower-power multi-phase pumps, thousands of oil wells worldwide are not or no longer being extracted, which means that valuable raw materials are not used.

Aufgabe der vorliegenden Erfindung ist es daher, eine Pumpe bereitzustellen, die kostengünstig herzustellen und zu warten ist und grundsätzlich für die Förderung von Multiphasengemischen im Rahmen einer Einzelquellenförderung geeignet ist.Object of the present invention is therefore to provide a pump that is inexpensive to manufacture and maintain and is basically suitable for the promotion of multi-phase mixtures in the context of a single source funding.

Erfindungsgemäß wird diese Aufgabe durch eine gattungsgemäße Schraubenspindelpumpe mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.According to the invention this object is achieved by a generic screw pump with the features of claim 1. Advantageous embodiments and further developments of the invention are described in the subclaims.

Die erfindungsgemäße Schraubenspindelpumpe in einflutiger, zweiwelliger Bauweise mit einer Außenlagerung der beiden Schraubenspindeln und einem Pumpengehäuse, das die Schraubenspindeln unter Bildung von Förderkammern umschließt und die Förderkammern mit seiner inneren Mantelfläche außen begrenzt, sowie einem Saugraum für das anzusaugende Medium und einem Druckraum, der das durch die Schraubenspindeln geförderte Medium aufnimmt, sieht vor, dass das Pumpengehäuse in einem Druckgehäuse eingeführt und an dem Druckgehäuse befestigt ist, so dass der Druckraum das Pumpengehäuse zumindest teilweise umgibt. Durch die Einführbarkeit des Pumpengehäuses in das Druckgehäuse und eine Befestigung des Pumpengehäuses an dem Druckgehäuse ist es möglich, lediglich das Pumpengehäuse mitsamt der darin angeordneten Schraubenspindeln und der Außenlagerung auszutauschen, so dass in modularer Bauweise eine Schraubenspindelpumpe bereitgestellt wird, die schnell repariert werden kann, indem die Verschleißteile komplett aus dem Druckgehäuse entfernt werden können. Durch einen einfachen Austausch des Pumpengehäuses mit den darin angeordneten Schraubenspindeln kommt es zudem zu einer mechanischen Entkopplung zwischen dem Druckgehäuse und dem Pumpengehäuse, so dass druckbedingte Verformungen innerhalb des Druckgehäuses nicht oder nur unmerklich auf das Pumpengehäuse übertragen werden. Dadurch bleibt die Lagegenauigkeit der Schraubenspindeln zueinander gewährleistet, da sich die Verformungen des Druckgehäuses nicht auf die Toleranzen der Förderelemente, Dichtungen und Lager auswirken. Dies reduziert den Verschleiß und ermöglicht das Einstellen eines geringen Spaltmaßes, was den Wirkungsgrad der Pumpe erhöht. Zur Komprimierung bei einem Einsatz im Single-well-boosting ist es vorgesehen, dass in dem Druckraum Separationseinrichtungen zum Trennen eines geförderten Multiphasengemisches in eine Gasphase und eine Flüssigkeitsphase vorgesehen sind, so dass die getrennten Phasen entweder separat abgeleitet oder ein Teil der separierten Flüssigkeitsphase über eine Kurzschlussleitung von dem Druckraum zu dem Saugraum zurückgeleitet werden kann, um ein Mindestmaß an Flüssigkeit innerhalb des Pumpengehäuses bereitzustellen, damit die Schraubenspindeln gekühlt und die Spalte zwischen den Schraubenspindeln sowie zwischen den Schraubenspindeln und dem Pumpengehäuse abgedichtet werden können.The screw pump according to the invention in single-flow, two-shaft design with an external bearing of the two screw spindles and a pump housing which surrounds the screw spindles to form delivery chambers and limits the delivery chambers with its inner circumferential surface outside, and a suction chamber for the medium to be sucked and a pressure chamber, the by the screw spindles receives conveyed medium, provides that the pump housing is inserted in a pressure housing and fixed to the pressure housing, so that the pressure chamber, the pump housing at least partially surrounds. By the introducibility of the pump housing in the pressure housing and a mounting of the pump housing to the pressure housing, it is possible to replace only the pump housing together with the screw spindles and the outer bearing, so that a screw pump is provided in a modular design, which can be repaired quickly by the wear parts can be completely removed from the pressure housing. By a simple replacement of the pump housing with the screw spindles arranged therein, there is also a mechanical decoupling between the pressure housing and the pump housing, so that pressure-induced deformations within the pressure housing are not or only imperceptibly transferred to the pump housing. As a result, the positional accuracy of the screw spindles is guaranteed to one another, since the deformations of the pressure housing do not affect the tolerances of the conveying elements, seals and bearings. This reduces wear and allows the setting of a small gap size, which increases the efficiency of the pump. For compression when used in single-well-boosting, it is provided that in the pressure chamber separation means for separating a subsidized multiphase mixture are provided in a gas phase and a liquid phase, so that the separated phases derived either separately or a part of the separated liquid phase over a Short circuit line can be returned from the pressure chamber to the suction chamber to provide a minimum of liquid within the pump housing, so that the screw spindles can be cooled and the gaps between the screw spindles and between the screw spindles and the pump housing can be sealed.

Eine Weiterbildung der Erfindung sieht vor, dass das Pumpengehäuse das Druckgehäuse durchragt, so dass das Pumpengehäuse zwei Anlage- oder Auflagerstellen in dem Druckgehäuse hat. Dabei ist es vorgesehen, dass das Pumpengehäuse nur einseitig an dem Druckgehäuse befestigt, insbesondere verschraubt ist, während das nicht an dem Druckgehäuse befestigte Ende des Pumpengehäuses in einer Führung in dem Druckgehäuse gelagert ist.A development of the invention provides that the pump housing projects through the pressure housing, so that the pump housing has two bearing or bearing points in the pressure housing. It is provided that the pump housing is attached only on one side to the pressure housing, in particular screwed, while the not attached to the pressure housing end of the pump housing is mounted in a guide in the pressure housing.

Somit ist es möglich, dass das Pumpengehäuse im Druckgehäuse einseitig fest und auf der anderen Seite leicht beweglich gelagert ist, wobei das geringe Spiel zwischen dem Druckgehäuse und dem Pumpengehäuse über zumindest eine Dichtung abgedichtet ist, so dass kein Fördermedium aus dem Druckraum durch Spalte in der Führung austreten kann. Das geringe Spiel innerhalb der Führung in dem Druckgehäuse ermöglicht es, dass durch den im Druckraum herrschenden Druck keine Verformungen innerhalb des Pumpengehäuses auftreten, die das Spiel zwischen den Schraubenspindeln untereinander sowie zwischen den Schraubenspindeln und dem Pumpengehäuse verändern könnten, sondern dass das Pumpengehäuse insgesamt innerhalb des Druckgehäuses leicht verlagert wirdThus, it is possible that the pump housing in the pressure housing is fixedly mounted on one side and slightly movable on the other side, wherein the small clearance between the pressure housing and the pump housing is sealed via at least one seal, so that no fluid from the pressure chamber through gaps in the Leadership can escape. The small clearance within the guide in the pressure housing makes it possible that by the pressure prevailing in the pressure chamber no deformations occur within the pump housing, which could change the play between the screw spindles among themselves and between the screw spindles and the pump housing, but that the pump housing as a whole within the Pressure housing is slightly displaced

Ein weiterer Vorteil der erfindungsgemäßen Ausgestaltung ist die einfachere Fertigung des Druckgehäuses aufgrund der geringeren Anforderungen an die Lagegenauigkeit der Bauteile, so dass eine kostengünstige Herstellung des Druckgehäuses möglich ist. Darüber hinaus ist die Wartung aufgrund der vollständigen Entnehmbarkeit des Pumpengehäuses mit samt der Schraubenspindeln und der Lagereinheit erheblich vereinfacht.Another advantage of the embodiment according to the invention is the simpler manufacture of the pressure housing due to the lower requirements on the positional accuracy of the components, so that a cost-effective production of the pressure housing is possible. In addition, the maintenance due to the complete removability of the pump housing, together with the screw spindles and the bearing unit is considerably simplified.

Um trotz des einfachen Aufbaus eine möglichst steife Konstruktion zu erzielen, ist es vorgesehen, das Pumpengehäuse über eine Trägerplatte an dem Druckgehäuse zu befestigen. An der Trägerplatte sind somit sowohl das Druckgehäuse als auch das Pumpengehäuse und gegebenenfalls auch die Lagereinheit, in der die Schraubenspindeln getrennt von dem Förderstrom gelagert sind, befestigt. Die Schraubenspindeln sind in der Lagereinheit gelagert, die wiederum mit dem Pumpengehäuse verbunden ist, so dass die Lagereinheit komplett mit dem Pumpengehäuse und den Schraubenspindeln aus dem Druckgehäuse entfernbar ist. Die Schraubenspindeln, das Pumpengehäuse und die Lagereinheit der Schraubenspindeln sind also zu einem Fördermodul zusammenfassbar, das leicht ausgetauscht und nach der Fertigung einem vollständigen Leistungstest unterzogen werden kann, so dass bei einem Austausch des Fördermoduls gegen ein neues oder überarbeitetes Fördermodul vorhersagbar ist, welche Leistungsparameter die Pumpe aufweist.In order to achieve a rigid construction, despite the simple structure, it is provided to attach the pump housing via a support plate to the pressure housing. On the support plate thus both the pressure housing and the pump housing and possibly also the bearing unit, in which the screw spindles are mounted separately from the flow, attached. The screw spindles are mounted in the bearing unit, which in turn is connected to the pump housing, so that the bearing unit is completely removable with the pump housing and the screw spindles from the pressure housing. The screw spindles, the pump housing and the bearing unit of the screw spindles are thus summarized to a conveyor module that can be easily replaced and subjected to a complete performance test after manufacture, so that when replacing the conveyor module against a new or revised conveyor module is predictable, which performance parameters Pump has.

Da sich das Pumpengehäuse innerhalb des Druckraumes befindet, ist es möglich, die Kurzschlussleitung innerhalb des Pumpengehäuses auszubilden, also eine direkte Verbindung zwischen dem Pumpenraum und dem Saugraum herzustellen.Since the pump housing is located within the pressure chamber, it is possible to form the short-circuit line within the pump housing, ie to establish a direct connection between the pump chamber and the suction chamber.

Durch die Kurzschlussleitung wird dosiert separierte Flüssigkeitsphase in den Saugraum zurückgeleitet, was zwar Einbußen bezüglich des Wirkungsgrades der Pumpe mit sich bringt, dafür bei dem Einsatz der Schraubenspindelpumpe zum Pumpen von Multiphasengemischen jedoch eine wesentlich verlängerte Standzeit ermöglicht.The short-circuit line dosed separated liquid phase is returned to the suction chamber, which, although sacrificing the efficiency of the pump with it, but allows for the use of the screw pump for pumping multi-phase mixtures, a much longer service life.

Das Pumpengehäuse kann außermittig in dem Druckgehäuse angeordnet sein, um einerseits die Separation und die Rückführung separierter Flüssigkeitsphase durch eine Kurzschlussleitung zur Saugseite der Schraubenspindeln zu erleichtern und um andererseits druckabhängige Verformungen des Druckgehäuses nicht oder so auf die Lagereinheit bzw. die Schraubenspindeln einwirken zu lassen, dass sie einer druckabhängigen Durchbiegung der Schraubenspirtdeln entgegengesetzte Winkeländerung der Lagereinheit erzeugen.The pump housing may be arranged eccentrically in the pressure housing, on the one hand to facilitate the separation and the return of separated liquid phase through a short-circuit line to the suction side of the screw spindles and on the other hand pressure-dependent deformations of the pressure housing or not act on the bearing unit or the screw spindles that they produce a pressure-dependent deflection of the Schraubenspirtdeln opposite angular change of the bearing unit.

Ergänzend können in dem Druckgehäuse Zuganker zur Vorspannung des Druckgehäuses gegenüber der Schraubenspindellagerung angeordnet sein, so dass eine druckabhängige Winkeländerung der Lagereinheit alternativ oder in Ergänzung zu der geeigneten Positionierung des Pumpengehäuses in dem Druckgehäuse sowie der Wahl der Wandstärke und/oder dem Einsatz von Materialien eingestellt werden kann.In addition, tension anchors for biasing the pressure housing relative to the screw spindle bearing can be arranged in the pressure housing so that a pressure-dependent angular change of the bearing unit can be set alternatively or in addition to the suitable positioning of the pump housing in the pressure housing and the choice of wall thickness and / or the use of materials can.

Zur weiteren Funktionsintegration in das Fördermodul ist es vorgesehen, dass in dem Pumpengehäuse der Saugraum ausgebildet ist, so dass dieser bezüglich der Dimensionierung und der strömungstechnischen Gestaltung optimal auf die Förderschrauben angepasst werden kann.For further functional integration in the delivery module, it is provided that the suction chamber is formed in the pump housing, so that it can be optimally adapted to the conveyor screws with respect to the dimensioning and the fluidic design.

Um die Ausgestaltung des Druckgehäuses zu vereinfachen, ist es vorgesehen, dass das Pumpengehäuse einen Teil der Wandung des Druckraumes ausbildet, also dass der Einsatz des Pumpengehäuses einen Teil der Innenwandung des Druckraumes bildet. Dazu ist es erforderlich, dass das Pumpengehäuse abgedichtet an dem Druckgehäuse befestigt ist, wobei Durchleitungen oder Strömungskanäle für das geförderte Medium vorgesehen sind, durch die das geförderte Medium in den Druckraum geleitet wird.In order to simplify the design of the pressure housing, it is provided that the pump housing forms part of the wall of the pressure chamber, so that the use of the pump housing is a part of the inner wall of the pressure chamber forms. For this purpose, it is necessary that the pump housing is sealed to the pressure housing, with passages or flow channels are provided for the pumped medium through which the pumped medium is passed into the pressure chamber.

Ebenfalls sind Anschlusseinrichtungen für Zuleitungen oder Ableitungen an dem Druckgehäuse ausgebildet, so dass das Druckgehäuse bei der Wartung der Pumpe nicht aus dem Leitungsnetz entfernt werden muss, wodurch sich ein beträchtlicher Montageaufwand vermeiden lässt und Dichtigkeitsprobleme durch das Ein- und Ausbauen kompletter Pumpen aus dem Leitungsnetz vermieden werden.Also, connection devices for supply lines or discharges are formed on the pressure housing, so that the pressure housing during maintenance of the pump does not have to be removed from the line network, which can be a considerable installation effort and avoid leakage problems by installing and removing complete pumps from the mains become.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der einzigen Figur erläutert, in der eine Schraubenspindelpumpe in Querschnittsansicht dargestellt ist.An embodiment of the invention will now be described with reference to the single figure, in which a screw pump is shown in cross-sectional view.

In der Figur ist eine einflutige Schraubenspindelpumpe mit zwei Schraubenspindeln 1, 2 gezeigt, die aus miteinander über Zahnräder gekoppelten Wellen 10, 20 und daran über Schrauben befestigte Rotoren 11, 12 bestehen. Die Wellen 10, 20 sind in einem Lagergehäuse 19 gelagert und bilden eine Lagereinheit 9, die gegenüber dem zu fördernden Medium abgedichtet ist. Die Rotoren 11, 12 sind in einem Pumpengehäuse 3 gelagert, wobei die Mantelinnenfläche 3a des Pumpengehäuses 3 die Rotoren 11, 12 umschließen, so dass durch die miteinander kämmenden Rotoren 11, 12 in Verbindung mit der Mantelfläche 3a Förderkammern 4 gebildet werden, in denen das zu fördernde Medium von einem Saugraum 5 in einen Druckraum 6 über Verbindungskanäle 16 gefördert wird. Sowohl zwischen den Rotoren 11, 12 als auch zwischen den Rotoren 11, 12 und der Mantelfläche 3a herrscht ein minimales Spiel, um die Leckrate der Pumpe möglichst gering zu halten.In the figure, a single-flow screw pump with two screw spindles 1, 2 is shown, consisting of mutually coupled via gears shafts 10, 20 and thereon fastened via screws rotors 11, 12. The shafts 10, 20 are mounted in a bearing housing 19 and form a bearing unit 9, which is sealed against the medium to be conveyed. The rotors 11, 12 are mounted in a pump housing 3, wherein the shell inner surface 3a of the pump housing 3, the rotors enclose 11, 12, so that are formed by the intermeshing rotors 11, 12 in conjunction with the lateral surface 3a delivery chambers 4, in which to be conveyed medium is conveyed from a suction chamber 5 into a pressure chamber 6 via connection channels 16. Both between the rotors 11, 12 and between the rotors 11, 12 and the lateral surface 3a there is a minimal game to keep the leak rate of the pump as low as possible.

Der Druckraum 6, vorliegend als ein Ringraum ausgebildet, wird von einem Druckgehäuse 7 gebildet, das den Druckraum 6 jeweils stirnseitig am Außenumfang abschließt. Der innere Abschluss des Druckraumes 6 wird über die Außenwandung des Pumpengehäuses 3 realisiert, da das Pumpengehäuse 3 das Druckgehäuse 7 und damit den Druckraum 6 durchragt. Das Pumpengehäuse 3 ist über Bolzen 40 an einer Trägerplatte 8 befestigt, an der ebenfalls über Bolzen 41 die Lagereinheit 9 befestigt ist. Die Trägerplatte 8 wiederum ist über Zuganker 42 mit dem Druckgehäuse 7 gekoppelt, so dass das Pumpengehäuse 3 über die Bolzen 40, die Trägerplatte 8 und die Zuganker 42 einseitig an dem Pumpengehäuse 7 befestigt ist. Das Pumpengehäuse 3 ist im Bereich der Bolzen 40 mit einem ringförmigen Flansch 37 versehen, der in eine korrespondierend ausgebildete Ausnehmung 27 des Pumpengehäuses 7 einführbar ist. Das der Trägerplatte 8 abgewandte Ende 30 des Pumpengehäuses 3 ist in einer Ausnehmung 17 des Pumpengehäuses 7 gelagert, dort jedoch nicht verschraubt, sondern nur über eine Dichtung 27 abgedichtet. Stirnseitig wird eine weitere Abdichtung über eine Stirnplatte 15 abgedichtet, die eine Durchgangsöffnung 25 zum Einleiten eines Fördermediums in den Saugraum 5 aufweist. Ebenfalls sind Gewinde 26 zur Aufnahme von Anschlussmitteln oder Zuleitungen in der Stirnplatte 15 vorgesehen.The pressure chamber 6, in the present case formed as an annular space, is formed by a pressure housing 7, which closes the pressure chamber 6 each end face on the outer periphery. The inner end of the pressure chamber 6 is realized via the outer wall of the pump housing 3, since the pump housing 3, the pressure housing 7 and thus the pressure chamber 6 protrudes. The pump housing 3 is fastened by bolts 40 to a carrier plate 8, to which the bearing unit 9 is likewise fastened via bolts 41. The support plate 8 in turn is coupled via tie rods 42 to the pressure housing 7, so that the pump housing 3 via the bolts 40, the support plate 8 and the tie rods 42 is fixed on one side to the pump housing 7. The pump housing 3 is provided in the region of the bolts 40 with an annular flange 37 which is insertable into a correspondingly formed recess 27 of the pump housing 7. The support plate 8 facing away from the end 30 of the pump housing 3 is mounted in a recess 17 of the pump housing 7, but not screwed there, but only sealed by a seal 27. On the face side, a further seal is sealed by means of a front plate 15, which has a through-opening 25 for introducing a pumped medium into the suction chamber 5. Also threaded 26 are provided for receiving connection means or leads in the end plate 15.

Die einseitige Lagerung des Pumpengehäuses 3 an dem Druckgehäuse 7 hat den Vorteil, dass die modulartig aufgebaute Kombination aus dem Pumpengehäuse 3, der Lagereinheit 9 und den darin angeordneten Förderspindeln 1, 2 von Druckverformungen des Druckgehäuses 7 entkoppelt ist. Das Druckgehäuse 7 kann auf den jeweiligen Systemauslegungsdruck ausgelegt sein und prinzipiell beliebig groß ausgestaltet werden, wobei lediglich die Ausnehmungen 17, 27 und Anschlusseinrichtungen so ausgebildet sein müssen, dass die entsprechenden Fördereinheiten oder Fördermodule aus Pumpengehäuse 3 und Lagereinheit 9 montiert werden können. Durch das Einsetzen der Fördereinheit in das Druckgehäuse 7 wird die Pumpe fertiggestellt, wobei das in die Fördereinheit integrierte Pumpengehäuse 3 gleichzeitig den Saugraum 5 ausbildet und für die Trennung von Saugraum 5 zum Druckraum 6 sorgt.The one-sided mounting of the pump housing 3 to the pressure housing 7 has the advantage that the modular design combination of the pump housing 3, the bearing unit 9 and the conveyor spindles 1, 2 disposed therein is decoupled from pressure deformation of the pressure housing 7. The pressure housing 7 can be designed for the respective system design pressure and in principle be made arbitrarily large, wherein only the recesses 17, 27 and connection devices must be designed so that the corresponding conveyor units or conveyor modules can be mounted from pump housing 3 and bearing unit 9. By inserting the delivery unit in the pressure housing 7, the pump is completed, wherein the pump housing 3 integrated in the delivery unit at the same time forms the suction chamber 5 and provides for the separation of the suction chamber 5 to the pressure chamber 6.

An dem Druckgehäuse 7 sind weiterhin Flansche 14 für die Ableitungen vorgesehen, die fest installiert bleiben können.On the pressure housing 7 flanges 14 are further provided for the derivatives, which can remain permanently installed.

In dem Druckraum 6 können Separationseinrichtungen für die Trennung von Gasphase und Flüssigkeitsphase bei der Förderung von Multiphasengemischen vorgesehen sein. Dies können Umlenkbleche oder Beruhigungszonen für die Erzeugung einer Strömungsgeschwindigkeit nahe Null sein, wobei an solchen Stellen bevorzugt eine Kurzschlussleitung 13 vorgesehen ist, die den Saugraum 5 mit dem Druckraum 6 verbindet. In der dargestellten Ausführungsform ist die Kurzschlussleitung 13 in dem Pumpengehäuse 3 ausgebildet und an der Unterseite angeordnet, so dass sich im unteren Teil des ringförmigen Druckraumes 6 befindliche Flüssigkeit, die bis zum Pumpengehäuse 3 angefüllt ist, in den Saugraum 5 angesogen und dort durch die Rotoren 11, 12 hindurch bewegt werden kann. Dadurch werden ein Wärmetransport, eine Abdichtung und eine Schmierung der Rotoren 11, 12 bewirkt. Die dargestellte Ausführungsform ist insbesondere geeignet, eine sichere Funktion der Pumpe auch bei sehr unterschiedlichen Bohrlochkopfdrücken zu gewährleisten, die von quasi atmosphärischen Drücken bis auf über 100 bar ansteigen können.In the pressure chamber 6 separation means for the separation of gas phase and liquid phase may be provided in the promotion of multi-phase mixtures. These may be baffles or calming zones for generating a flow velocity near zero, wherein at such locations a short-circuit line 13 is preferably provided, which connects the suction chamber 5 with the pressure chamber 6. In the illustrated embodiment, the short-circuit line 13 is formed in the pump housing 3 and arranged on the bottom, so that in the lower part of the annular pressure chamber 6 located liquid that is filled to the pump housing 3, sucked into the suction chamber 5 and there by the rotors 11, 12 moved through can be. This causes heat transfer, sealing and lubrication of the rotors 11, 12. The illustrated embodiment is particularly suitable to ensure safe operation of the pump even at very different wellhead pressures that can rise from quasi-atmospheric pressures to over 100 bar.

In der Einlassöffnung 25 oder davor können Pumpenschutzfilter integriert oder angeordnet sein, um ungewünschte Partikel zurückzuhalten und Beschädigungen der Rotoren 11, 12 zu vermeiden.In the inlet opening 25 or in front of pump protection filters may be integrated or arranged to retain unwanted particles and to avoid damage to the rotors 11, 12.

Claims (14)

  1. Screw pump of single-entry, double-shaft construction with two screw shafts (1, 2) and a pump housing (3) enclosing the screw shafts (1, 2) by forming conveying chambers (4) and externally delimiting the conveying chambers (4) with its internal shell surface (3a), as well as an suction chamber (5) for the medium to be induced and a pressure chamber (6) to accommodate the medium pumped by the screw shafts (1, 2), whereby the pump housing (3) is inserted into a pressure housing (7) and attached to the pressure housing (7), so that the pressure chamber (6) encloses the pump housing (3) at least in part, characterized in that the two screw shafts (1, 2) are supported with an external bearing and separation devices are provided in the pressure chamber (6) to separate a pumped multi-phase mixture into a gas phase and a liquid phase and that a bypass line (13) is provided from the pressure chamber (6) to the induction chamber (5), through which line separated liquid is guided back into the suction chamber (5).
  2. Screw pump according to claim 1, characterized in that the pump housing (3) extends through the pressure housing (7).
  3. Screw pump according to claim 1 or 2, characterized in that the pump housing (3) is attached, in particular screwed, to the pressure housing (7) on one side.
  4. Screw pump according to claim 3, characterized in that the pump housing (3) is attached to the pressure housing (7) via a base plate (8).
  5. Screw pump according to claim 3 or 4, characterized in that the end (30) of the pump housing (3) not attached to the pressure housing (7) is supported with clearance in a guideway (17) in the pressure housing (7), and the pump housing (3) is sealed with respect to the pressure housing (7) by means of a seal (27).
  6. Screw pump according to one of the preceding claims, characterized in that the screw shafts (1, 2) are supported in a bearing unit (9) connected to the pump housing (3).
  7. Screw pump according to claim 6, characterized in that the bearing unit (9) is attached, in particular screwed, to a base plate (8).
  8. Screw pump according to one of the preceding claims, characterized in that the screw shafts (1, 2), the pump housing (3) and a bearing unit (9) of the screw shafts (1, 2) are combined to form a conveying module.
  9. Screw pump according to one of the preceding claims, characterized in that the bypass line (13) is embodied in the pump housing (3).
  10. Screw pump according to one of the preceding claims, characterized in that the pump housing (3) is arranged off-center in the pressure housing (7).
  11. Screw pump according to one of the preceding claims, characterized in that tie rods (42) are arranged in the pressure housing (7) to prestress the pressure housing (7) with respect to the screw shaft bearing (9).
  12. Screw pump according to one of the preceding claims, characterized in that the suction chamber (5) is embodied in the pump housing (3).
  13. Screw pump according to one of the preceding claims, characterized in that the pump housing (3) forms a part of the wall of the pressure chamber (6).
  14. Screw pump according to one of the preceding claims, characterized in that connecting devices (14) for feed lines and discharge lines are embodied on the pressure housing (7).
EP06753222A 2005-06-02 2006-05-31 Screw displacement pump Active EP1893872B1 (en)

Applications Claiming Priority (2)

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DE102005025816A DE102005025816B4 (en) 2005-06-02 2005-06-02 Screw Pump
PCT/DE2006/000940 WO2006128441A1 (en) 2005-06-02 2006-05-31 Screw displacement pump

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EP1893872A1 EP1893872A1 (en) 2008-03-05
EP1893872B1 true EP1893872B1 (en) 2010-11-03

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US (1) US7862315B2 (en)
EP (1) EP1893872B1 (en)
JP (1) JP4955665B2 (en)
KR (1) KR101158957B1 (en)
CN (1) CN101208518B (en)
AT (1) ATE487063T1 (en)
BR (1) BRPI0611073B1 (en)
CA (1) CA2609670C (en)
DE (2) DE102005025816B4 (en)
DK (1) DK1893872T3 (en)
ES (1) ES2353972T3 (en)
NO (1) NO337323B1 (en)
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Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012002816B4 (en) * 2012-02-15 2014-06-26 Leistritz Pumpen Gmbh Screw Pump
US10495084B2 (en) * 2012-04-11 2019-12-03 Itt Manufacturing Enterprises Llc Method for twin screw positive displacement pump protection
DE102014000846A1 (en) * 2014-01-27 2015-07-30 Klaus Union Gmbh & Co. Kg Screw Pump
USD749138S1 (en) 2014-12-19 2016-02-09 Q-Pumps S.A. de C.V. Twin screw pump
USD803895S1 (en) * 2015-12-18 2017-11-28 Mi-T-M Corporation Rotary screw compressor
DE102017112743B3 (en) 2017-06-09 2018-10-25 Leistritz Pumpen Gmbh Modular system for producing a screw pump
DE102017118971A1 (en) 2017-08-18 2019-02-21 Klaus Union Gmbh & Co. Kg Multiphase pump with separation housing
DE102019103470A1 (en) * 2019-02-12 2020-08-13 Nidec Gpm Gmbh Electric screw spindle coolant pump
DE102019118086A1 (en) 2019-07-04 2021-01-07 Nidec Gpm Gmbh Integrated screw spindle coolant pump
DE102020122460A1 (en) 2020-08-27 2022-03-03 Leistritz Pumpen Gmbh Process and screw pump for conveying a gas-liquid mixture
DE102020133760A1 (en) * 2020-12-16 2022-06-23 Leistritz Pumpen Gmbh Process for conveying a fluid through a screw pump and screw pump
DE102021133106A1 (en) * 2021-12-14 2023-06-15 Leistritz Pumpen Gmbh screw pump
DE102021133114A1 (en) 2021-12-14 2023-06-15 Leistritz Pumpen Gmbh screw pump
DE102021133112A1 (en) * 2021-12-14 2023-06-15 Leistritz Pumpen Gmbh screw pump
DE102022207330A1 (en) 2022-07-19 2024-01-25 Vitesco Technologies GmbH Spindle pump stage, fluid delivery device and motor vehicle
WO2024039524A1 (en) * 2022-08-17 2024-02-22 Circor Pumps North America, Llc. Multiphase pumping system

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE715860C (en) * 1940-01-03 1942-01-08 Fr August Neidig Soehne Maschi Screw pump
US2381695A (en) * 1943-03-11 1945-08-07 Laval Steam Turbine Co Pumping system
US3016842A (en) * 1959-02-23 1962-01-16 Laval Steam Turbine Co Screw pump
US3016942A (en) 1959-11-20 1962-01-16 Blue Valley Machine & Mfg Comp Metal plate flanging machine
DD153168A5 (en) * 1979-09-24 1981-12-23 Isartaler Schraubenkompressor COMPRESSOR SYSTEM
JPS57134376A (en) * 1981-02-13 1982-08-19 Yamaha Motor Co Ltd Hull structure of rowboat
DE3245973A1 (en) * 1982-12-11 1984-06-14 Allweiler Ag, 7760 Radolfzell ENGINE PUMP UNIT
JPS59176491A (en) * 1983-03-25 1984-10-05 Anretsuto:Kk Horizontal two-shaft compression pump
JPH01118177A (en) * 1987-10-31 1989-05-10 Toshiba Corp Image forming device
DE3920900A1 (en) * 1989-06-26 1991-01-03 Allweiler Ag SCREW PUMP
ITMI920916U1 (en) * 1992-10-20 1994-04-20 Settima Meccanica Di Cagnani F SCREW PUMP
DE9315766U1 (en) 1992-11-19 1993-12-23 R D I Deutschland Autoteile & Steering wheel for motor vehicles
US5269667A (en) * 1993-02-24 1993-12-14 Ingersoll-Rand Company Removabe discharge port plate for a compressor
DE4316735C2 (en) * 1993-05-19 1996-01-18 Bornemann J H Gmbh & Co Pumping method for operating a multi-phase screw pump and pump
IT1277541B1 (en) * 1995-09-05 1997-11-11 Nuovo Pignone Spa PERFECTED DOUBLE SCREW PUMP PARTICULARLY SUITABLE FOR PUMPING TWO-PHASE FLUIDS IN SUBMARINE ENVIRONMENTS
DE19748385A1 (en) * 1997-11-03 1999-05-06 Peter Frieden Vacuum pump or compressor
RU2164312C1 (en) 1999-07-07 2001-03-20 Открытое акционерное общество "Татарский научно-исследовательский и проектно-конструкторский институт нефтяного машиностроения" Multiphase screw pump
DE19963172A1 (en) * 1999-12-27 2001-06-28 Leybold Vakuum Gmbh Screw-type vacuum pump has shaft-mounted rotors each with central hollow chamber in which are located built-in components rotating with rotor and forming relatively narrow annular gap through which flows cooling medium
DE10257859C5 (en) * 2002-12-11 2012-03-15 Joh. Heinr. Bornemann Gmbh Screw Pump

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JP4955665B2 (en) 2012-06-20
JP2008542605A (en) 2008-11-27
RU2007147333A (en) 2009-06-27
KR101158957B1 (en) 2012-06-21
US7862315B2 (en) 2011-01-04
CN101208518B (en) 2010-10-06
EP1893872A1 (en) 2008-03-05
CN101208518A (en) 2008-06-25
BRPI0611073B1 (en) 2018-09-18
DK1893872T3 (en) 2011-02-21
US20080199340A1 (en) 2008-08-21
KR20080034875A (en) 2008-04-22
DE502006008233D1 (en) 2010-12-16
CA2609670C (en) 2012-08-07
ES2353972T3 (en) 2011-03-08
NO20076677L (en) 2008-01-23
RU2392496C2 (en) 2010-06-20
DE102005025816B4 (en) 2010-06-02
BRPI0611073A2 (en) 2010-08-03
ATE487063T1 (en) 2010-11-15
NO337323B1 (en) 2016-03-07
DE102005025816A1 (en) 2006-12-07
CA2609670A1 (en) 2006-12-07
WO2006128441A1 (en) 2006-12-07

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