EP3017140B1 - Device for adjusting a media pressure relative to an ambient pressure - Google Patents

Device for adjusting a media pressure relative to an ambient pressure Download PDF

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Publication number
EP3017140B1
EP3017140B1 EP14735469.0A EP14735469A EP3017140B1 EP 3017140 B1 EP3017140 B1 EP 3017140B1 EP 14735469 A EP14735469 A EP 14735469A EP 3017140 B1 EP3017140 B1 EP 3017140B1
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EP
European Patent Office
Prior art keywords
pressure
seawater
piston
media
bellows
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EP14735469.0A
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German (de)
French (fr)
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EP3017140A2 (en
Inventor
Frank Bauer
Martin Groben
Alexander ALBERT
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Hydac Technology GmbH
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Hydac Technology GmbH
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
    • E21B33/064—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers specially adapted for underwater well heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/103—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means the separating means being bellows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3153—Accumulator separating means having flexible separating means the flexible separating means being bellows

Definitions

  • the invention relates to a device for adjusting a medium pressure in relation to an ambient pressure with the features of claim 1.
  • BOP blowout preventer
  • a hydraulic fluid with a correspondingly high working pressure must be available for hydraulic actuation. Because there are extraordinary difficulties prepared to transport a hydraulic fluid with a sufficiently high working pressure and in a sufficient quantity from a drilling platform or a drilling ship from the water surface to the correspondingly deep seabed, it is prior art, cf. U.S. 6,418,970 B1 , to use the hydraulic working pressure at the site of the deep-sea plant itself, which is required for the operation of corresponding deep-sea plants, in the case of these devices. The required hydraulic working pressure is therefore generated with the help of the surrounding pressure of the deep sea, i.e. with the high pressure of the deep water. A piston in a cylinder is subjected to the ambient pressure of the deep sea and the resulting piston movement transfers the pressure to the hydraulic fluid.
  • a cylinder arrangement contains a first pressure chamber for the pressure fluid, a piston arrangement that can be moved to change the volume of this pressure chamber, and at least one second pressure chamber.
  • the second pressure chamber can be subjected to the ambient pressure of the deep sea for a movement of the piston arrangement that generates the working pressure in the first pressure chamber.
  • a pressure accumulator associated with the cylinder arrangement is provided in the form of a bladder accumulator, the movable separating element of which separates a space connected to the seawater from a movement space.
  • the actuation chamber contains an actuation fluid and is connected to the second pressure chamber in order to apply the deep-sea pressure to it by means of the actuation fluid.
  • the GB 1 305 990 A describes a device with the features in the preamble of claim 1 for setting a medium pressure in relation to an ambient pressure, which is predetermined when the device is used by a depth-dependent sea water pressure, the sea water pressure acting on a compensator device that allows a reversible change in length or expansion, wherein there are at least two compensator elements of the compensator device in the direction of the change in length or expansion as a result, with at least one end wall of a pressure booster device being exposed to seawater attack when it is used, with the pressure booster device having a double-piston arrangement which has one piston on the seawater space and the other piston Piston adjacent to the media space, wherein the double piston assembly is guided axially movable in a receiving housing, wherein an inner wall of the receiving housing forms a running surface for the piston, wherein the The device comprises a tube which forms the receiving housing, the compensator device being provided on the inside of the receiving housing between a piston of the double-piston arrangement and an entry point of the tube
  • the object of the invention is to provide a device for adjusting a media pressure in relation to an ambient pressure, which has proven to be robust, particularly when used under water, is inexpensive to manufacture and can be easily replaced if necessary.
  • the compensator device is formed from a bellows; that the compensator elements are formed from individual bellows folds arranged one behind the other, which at least partially form the wall of the bellows; that the bellows is welded at its one free end to the pipe in the area of the entry point; and that the bellows rests loosely at the other end during operation with pretension on the outer peripheral edge of the adjoining end face of the piston on the sea water side.
  • the compensator device protects the device at least partially from the corrosive seawater. Surprisingly, it has also been shown that the use of such a compensator device is inexpensive if expensive components do not come into contact with the seawater and are therefore protected. Furthermore, redundancy is brought about by connecting two or more compensator elements in series. In addition, such compensator elements have proven to be more robust than the bladder accumulator known from the prior art.
  • the media pressure can be adjusted in such a way that the seawater pressure can be compensated for with respect to a hydraulic working pressure in the fluidic circuit of a hydraulic working device connected to the device, in particular a blowout preventer.
  • the setting of the media pressure can be used to preload the operating pressure of the fluidic working circuit with the sea water pressure in order to use the preloaded and therefore very high working pressure, which essentially corresponds to the sea water pressure, directly for the actuation of the connected work equipment.
  • the respective compensator elements are advantageously at least partially resilient or otherwise elastic and, starting from an initial position, experience the change in length or expansion in one direction by means of the sea water pressure and can be moved back in the opposite direction in the direction of this initial position when the sea pressure is removed.
  • This embodiment also allows use with different seawater pressures. Consequently, the device can also be used at different depths. Furthermore, the elasticity of the compensator elements allows multiple use of the device.
  • the compensator device is formed from a bellows and the compensator elements are formed from individual bellows folds arranged one behind the other, which at least partially form the wall of the bellows.
  • a bellows has proven to be particularly robust and durable for use in the deep sea. Another advantage is that the device works perfectly even at very high seawater pressure and that no diffusion through the bellows can take place.
  • At least one end wall of the bellows and/or a pressure boosting device is exposed to seawater attack and this closing wall is set back in the direction of the pressure boosting device compared to an entry point for the seawater.
  • Such a front end wall enables the pressure boosting device to be shielded from the sea water.
  • at least parts of the device according to the invention are protected from seawater.
  • the pressure boosting device creates at least a media-tight seal between the sea water space with the sea water pressure and the media space with the media pressure within the receiving housing. In this way, the media room is safely separated from the seawater room. The respective media cannot be transferred. This prevents damage to downstream units that may only come into contact with the medium and not with the seawater.
  • the pressure boosting device and then the media chamber can advantageously be connected to the compensator device.
  • This structure is particularly compact and is advantageously characterized in that the moving device is uniform within the device is and does not have to be deflected by mechanical or hydraulic intermediate links. Such power transmissions with changes in direction are regularly associated with energy losses, which are avoided with the device according to the invention.
  • the pressure boosting device has a double piston, one piston of which adjoins the seawater space and the other piston adjoins the media space.
  • a double piston has the advantage that an intermediate space is formed between the two pressure chambers, which can be used for additional sealing.
  • At least one further, second medium chamber which accommodates a high-pressure medium, is arranged between the pistons of the double-piston arrangement.
  • the high-pressure medium can be a working gas, in particular nitrogen (N 2 ), which is under a pressure of at least 1 bar, more preferably at least 100 bar, more preferably at least 200 bar, more preferably at least 300 bar, more preferably 400 bar , stands.
  • the second medium space with the high-pressure medium is advantageously permanently connected to a pressure reservoir.
  • the pressure reservoir may concentrically enclose the receiving housing. This arrangement is advantageous in terms of efficient use of the installation space because it is particularly compact. By connecting an extended pressure reservoir, a higher pressure can also be provided over a longer stroke. In this way, the medium in the first media space is acted upon both by the ambient pressure of the seawater and by the pressure of the high-pressure medium.
  • the second media space and/or the pressure reservoir can also be formed outside of the device by a third component that can be connected to the device, for example in the form of a separate storage arrangement.
  • third medium space can be arranged between the pistons of the double-piston arrangement, which medium accommodates a low-pressure medium, in particular in the form of a vacuum.
  • the second and third media space can be delimited by a piston partition wall, in which a piston rod is guided in a longitudinally displaceable manner, and one of the pistons of the piston arrangement is fastened to the respective end region of the piston rod.
  • the low-pressure medium in particular a working gas such as nitrogen (N 2 ), or the vacuum relieves the pressure on the piston, which is subjected to the ambient pressure of the sea water, on the opposite side.
  • the low-pressure medium in the third media space is under a pressure of less than 1 bar, preferably less than 0.5 bar.
  • the bellows, the pistons and the piston partition wall can preferably each have a maximum outside diameter which is the same and corresponds to a uniformly running inside wall diameter of the receiving housing.
  • the receiving housing can be of tubular design.
  • the receiving housing is therefore particularly cost-effective to manufacture and is pressure-stable with respect to the influences of ambient pressure.
  • At least the seawater space-side piston of the double piston arrangement is advantageously sealed off from an inner wall of the receiving housing by means of a sealing device.
  • seawater is prevented from penetrating into the double-piston arrangement.
  • medium or working gas is prevented from escaping from the double-piston arrangement in the direction of the seawater.
  • the figure shows the device 1 for setting a media pressure in relation to an ambient pressure, which is predetermined when the device 1 is used by a depth-dependent pressure of sea water.
  • the device 1 consists essentially of two concentric tubes 3, 5, which are held at the end by ring elements 7, 9 at a distance.
  • a first medium space is provided, which is closed off by a disc 13 at the end.
  • An axial bore 15 is provided in the disc 13 for the transfer of a medium from the first medium space 11 into a downstream hydraulic circuit, not shown in detail, with attached working equipment, for example in the form of a blowout preventer.
  • the media space 11 can be acted upon by a pressure boosting device 17 in the form of a double piston arrangement 19 , the piston 21 of which is on the right in the plane of the drawing and is adjacent to the first media space 11 .
  • the double piston arrangement 19 is guided in an axially movable manner in the receiving housing 5, with an inner wall 23 of the receiving housing 5 forming a running surface 25 for the pistons 21, 27.
  • the piston 27 on the left in the plane of the drawing of the double piston arrangement 19 can be acted upon by seawater as the end wall 29 when the device is in operation.
  • This closing wall 29 is set back in the direction of the pressure boosting device 17 in relation to an entry point 31 for the sea water.
  • the pressure boosting device 17 thus creates a media-tight seal between a sea water space 33 with the sea water pressure and the media space 11 with the media pressure within the common receiving housing 5 .
  • a compensator device is located on the inside of the receiving housing 5 between the left-hand piston 27 and the entry point 31 of the inner tube 5 35 provided.
  • the seawater pressure acts on the compensator device 35, which allows a reversible change in length or expansion.
  • the compensator device 35 is formed from a bellows 39 .
  • the bellows 39 is made of corrosion resistant stainless steel materials. At its one free end, the bellows 39 is welded to the inner tube 5 in the area of the entry point 31 . At the other end, the bellows 39 preferably rests loosely on the outer peripheral edge of the adjoining end face of the left-hand piston 27 during operation with pretension.
  • a supporting liquid is additionally introduced between the bellows 39 and the extent assignable inner wall 23 of the tube 5, for example in the form of an alcohol compound (glycol), which stiffens the distances between the bellows folds and supports them to this extent.
  • a part of the supporting liquid is also located as a kind of replenishment amount to compensate for volume fluctuations when moving the spring or bellows 39 between its closed bottom end and the adjacent end wall 29 of the in the direction of view 1 Seen extreme left piston 27.
  • the bellows 39 is arranged coaxially to the pressure booster device 17.
  • compensator elements 41 of the compensator device 35 are provided in sequence in the direction of the change in length or expansion.
  • the compensator elements 41 are formed from individual bellows folds which are arranged one behind the other and are trapezoidal in longitudinal section.
  • the bellows folds 41 form a wall 43 of the bellows 39 . They contact the inner wall 23 of the receiving housing 5 on the outside.
  • the respective compensator elements 41 are resilient. Starting from an initial position, the compensator elements 41 experience the change in length or expansion in one direction by means of the seawater pressure. When the seawater pressure is removed, the compensator elements can be moved back in the opposite direction towards the starting position.
  • the working capacity of the device and the volume of the sea water space are thus at least partially predetermined by the number and shape of the bellows folds 41 .
  • the in the 1 and 2 The bellows 39 shown is formed from an elastomeric material (rubber) which can be coated against the corrosive effect of sea water.
  • elastomer bellows one made of steel materials, preferably in the form of stainless steel, can also be used, which then does not rust. In this case, however, the bellows folds are not trapezoidal, as shown, but are provided with corresponding, even curves (not shown).
  • a second medium chamber 45 is arranged, which receives a high-pressure medium.
  • This high-pressure medium is a working gas, specifically nitrogen (N 2 ).
  • the second medium chamber 45 with the high-pressure medium is permanently connected to a pressure reservoir 47 , which is located between the inner tube 5 and the outer tube 3 , via a bore 49 in the inner tube 5 .
  • the pressure reservoir 47 surrounds the receiving housing 5 concentrically.
  • a further, third medium chamber 51 is arranged between the double pistons 21, 27 and accommodates a low-pressure medium in the form of a working gas, here nitrogen (N 2 ), but preferably accommodates a vacuum.
  • the second and third media chambers 45, 51 are delimited by a piston partition wall 53 arranged in a stationary manner in the receiving housing 5.
  • a piston rod 57 is guided in a longitudinally displaceable manner in a bore 55 of the piston partition wall 53, and a piston 21, 27 of the double-piston arrangement 19 is fastened to the respective end region of said piston rod.
  • the pistons 21, 27 of the double piston arrangement 19 and the piston partition wall 53 each have two circumferential grooves 59 in which ring-shaped sealing elements 61 are arranged as sealing arrangements for sealing against the inner wall 23 of the receiving housing 5. Furthermore, in the bore 55 in the Piston partition two inner peripheral grooves 63 are provided, in which two sealing elements 65 are also arranged. In this way, the media spaces 11, 45, 51 and the seawater space 33 are separated from one another in a media-tight manner. In particular, the sealing elements 61 prevent the supporting liquid of the bellows 39 from being able to get onto the side 51 of the media space.
  • the bellows 39, the pistons 21, 27 and the piston partition wall 53 each have a maximum outer diameter A which is the same and corresponds to the inner wall diameter I of the receiving housing 5 which runs uniformly.
  • each bellows fold 41 is formed from two flanks 67 , 69 which are inclined towards one another at the same angle and which, in fictitious extension, enclose an acute angle ⁇ with one another which lies on the inside 71 of the bellows 39 .
  • each flank 67, 69 of a bellows fold 41 merge in the direction of the inner side 71 into binding bridges 75 which run coaxially to the longitudinal axis LA of the bellows 39 and which stiffen the adjacent flanks 67, 69 and otherwise connect with the adjacent binding bridges 75 form a fictitious inner tube 77 within the bellows 39.
  • each flank 67, 69 merges with a predeterminable bending radius r into a contact bridge 81, which also runs coaxially to the longitudinal axis LA of the bellows 39 and which remains in sliding contact with the inner wall 23 of the inner tube 5 in every movement position of the bellows 39.
  • All contact bridges 81 in turn form an imaginary outer tube 83 of the bellows 39 which is concentric with the inner tube 77 .
  • the binding bridges 75 and the contact bridges 81 stiffen the bellows 39 as a whole and cause the bellows deformation work to be carried out largely or exclusively by flapping movements of the flanks 67, 69 in the direction of the feet 79.
  • the respective adjacent feet 79 of a bellows fold 41 move when they are reduced or increasing the volume defined by the bellows fold 41 at the level of the outer tube 83 towards or away from each other, depending on whether the bellows 39 is compressed or expanded during operation.
  • the deformation work of the bellows 39 is therefore only performed by the movement of the resiliently restoring flanks 67, 69.
  • the flanks 67, 69 are connected to the adjacent binding bridges 75 via hinge points 85. This ensures that the binding bridges 75 always maintain their concentric alignment with one another during operation. Even at very high seawater or working pressures, the bellows 39 cannot buckle, or at least only slightly, so that the contact bridges 81 remain in sliding contact with the inner wall 23 of the inner tube 5 in every possible travel position of the bellows 39, which provides a guide for the bellows 39 forms.
  • the bellows 39 and its folds 41 are aligned rotationally symmetrically to the longitudinal axis LA of the device 1 . In order to avoid tension in the bellows folds 41, the contact bridges 81 and the binding bridges 75 are of the same width and are filled with the support liquid mentioned.
  • the device 1 according to the invention is intended to be lowered onto the seabed as part of a blowout preventer.
  • the high ambient pressure of the seawater at a depth of 3600 m, for example, amounting to 360 bar acts on the device 1 .
  • the seawater acts on the compensator device 35 and the left-hand piston 27 of the pressure boosting device 17 and generates a corresponding pressure in the medium in the first medium space 11 .
  • the medium in the first media space 11 is acted upon by the high-pressure medium in the second media space 45 . If the medium is now retrieved from the first medium chamber 11 in an emergency, the double piston arrangement 17 moves to the right in the image plane.
  • the compensator device 35 experiences a change in length, since it is coupled at the end to the double piston arrangement 17 and to the receiving housing 5 .
  • the compensator device 35 advantageously protects the inner wall of the receiving housing 5 from contact with the corrosive seawater, regardless of the position of the double piston arrangement 19 .
  • the invention thus shows a particularly advantageous device 1 for setting a medium pressure in relation to an ambient pressure.
  • the compensator device 35 protects the device 1 at least partially from the corrosive seawater.
  • the use of such a compensator device 35 is inexpensive if expensive components, such as the inner wall 23 of the receiving housing 5, do not come into contact with the seawater and are therefore protected.
  • redundancy is brought about by the series connection of two or more compensator elements 41 .
  • a bellows 39 with such compensator elements 41 has proven to be more robust than a bladder accumulator known from the prior art.
  • the entire device has a stepped design, in particular that the seawater pressure boosting part with the bellows has a smaller diameter than the double-piston arrangement.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Measuring Fluid Pressure (AREA)
  • Diaphragms And Bellows (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Transmission Devices (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Einstellen eines Mediendruckes gegenüber einem Umgebungsdruck mit den Merkmalen von Anspruch 1.The invention relates to a device for adjusting a medium pressure in relation to an ambient pressure with the features of claim 1.

Die zunehmende Verknappung der Ressourcen zwingt zu immer größeren Anstrengungen bei der Gewinnung von Rohstoffen und Energieträgern. Dies führt dazu, dass Bohrungen zur Förderung von Öl und Gas in immer größeren Meerestiefen durchgeführt werden müssen. Für den sicheren Betrieb derartiger Tiefwasserbohrungen, die von Bohrplattformen oder Bohrschiffen durchgeführt werden, sind am Meeresboden umfangreiche Sicherheitsanlagen vorgesehen, die dem Übergangsbereich zwischen Bohrloch und Bohrrohr oder Förderrohr funktional zugeordnet sind. Ein wichtiges, zum Sicherheitsstandard derartiger Tiefwasserbohrungen gehörendes Anlagenteil ist hierbei ein sogenannter Blowout Preventer (BOP). Diese Einrichtung bewirkt in einem Gefahrenfalle einen Schnellverschluss des Bohrlochausgangs, Bohrrohrs und/oder Förderrohrs.The increasing scarcity of resources forces ever greater efforts in the extraction of raw materials and energy sources. As a result, drilling for oil and gas production has to be carried out at ever greater sea depths. For the safe operation of such deep-water wells, which are carried out by drilling platforms or drilling ships, extensive safety systems are provided on the seabed, which are functionally assigned to the transition area between the well and the drill pipe or production pipe. A so-called blowout preventer (BOP) is an important part of the plant that is part of the safety standard for such deep-water wells. In the event of danger, this device causes a quick closure of the borehole outlet, drill pipe and/or production pipe.

Um eine sichere Funktion eines Blowout Preventers zu gewährleisten, muss eine Druckflüssigkeit zur hydraulischen Betätigung mit einem entsprechend hohen Arbeitsdruck verfügbar sein. Da es außerordentliche Schwierigkeiten bereitet, eine Druckflüssigkeit mit einem ausreichend hohen Arbeitsdruck und in einer ausreichenden Menge von einer Bohrplattform oder einem Bohrschiff von der Wasseroberfläche aus zum entsprechend tiefgelegenen Meeresboden zu transportieren, ist es Stand der Technik, vgl. US 6 418 970 B1 , bei diesen Vorrichtungen den zur Betätigung entsprechender Tiefseeanlagen erforderlichen hydraulischen Arbeitsdruck am Ort der Tiefseeanlage selbst zu nutzen. Es wird mithin mit Hilfe des umgebenden Druckes der Tiefsee, also mit dem hohen Druck des Tiefwassers, der benötigte hydraulische Arbeitsdruck erzeugt. Ein Kolben wird in einem Zylinder mit dem Umgebungsdruck der Tiefsee beaufschlagt und durch die dadurch bewirkte Kolbenbewegung wird der Druck auf die Druckflüssigkeit übertragen.In order to ensure a safe function of a blowout preventer, a hydraulic fluid with a correspondingly high working pressure must be available for hydraulic actuation. Because there are extraordinary difficulties prepared to transport a hydraulic fluid with a sufficiently high working pressure and in a sufficient quantity from a drilling platform or a drilling ship from the water surface to the correspondingly deep seabed, it is prior art, cf. U.S. 6,418,970 B1 , to use the hydraulic working pressure at the site of the deep-sea plant itself, which is required for the operation of corresponding deep-sea plants, in the case of these devices. The required hydraulic working pressure is therefore generated with the help of the surrounding pressure of the deep sea, i.e. with the high pressure of the deep water. A piston in a cylinder is subjected to the ambient pressure of the deep sea and the resulting piston movement transfers the pressure to the hydraulic fluid.

Trotz der Vorteile, die durch die Erzeugung oder die Übertragung des Arbeitsdruckes am Einsatzort entstehen, sind die Betriebseigenschaften der bekannten Vorrichtungen nicht zufriedenstellend. Die Benutzung des Seewassers zum Betrieb der Zylinderanordnung ist in mehrerlei Hinsicht problematisch. Zum einen besteht die Gefahr der Verschmutzung durch Eintritt von Sedimentpartikeln und dergleichen oder durch Mikroorganismen, die zusammen mit dem Seewasser eingebracht werden. Zum anderen ergeben sich Beeinträchtigungen aufgrund des äußerst korrosiv wirkenden Seewassers. Um letzterem zu begegnen, ist es beim Stand der Technik erforderlich, die Zylinderanordnung mit geeigneten Auskleidungen zu versehen und/ oder aus entsprechend korrosionsfesten Materialien herzustellen, um die Korrosion und/oder den durch Anlagerungen erhöhten Reibungskoeffizienten bei Kolbenbewegungen zu verringern. Trotz dieser Maßnahmen ergeben sich Schwierigkeiten durch Salzwasserablagerungen, beispielsweise durch Kaliumstearat.In spite of the advantages that result from the generation or transmission of the working pressure at the point of use, the operating properties of the known devices are not satisfactory. The use of seawater to operate the cylinder assembly is problematic in a number of respects. On the one hand, there is the risk of contamination from the ingress of sediment particles and the like or from microorganisms that are introduced together with the seawater. On the other hand, there are impairments due to the extremely corrosive effect of seawater. In order to counteract the latter, it is necessary in the prior art to provide the cylinder arrangement with suitable linings and/or to produce it from correspondingly corrosion-resistant materials in order to reduce corrosion and/or the increased coefficient of friction during piston movements due to deposits. Despite these measures, difficulties arise from salt water deposits, for example from potassium stearate.

Um diese Herausforderungen zu überwinden, wurde in der DE 10 2011 009 276 A1 eine Vorrichtung zum Übertragen eines hydraulischen Arbeitsdruckes in einer Druckflüssigkeit zur Druckbetätigung hydraulischer Einrichtungen von Tiefseeanlagen, insbesondere Tiefwasserbohrungen, vorgeschlagen. In einer Zylinderanordnung sind ein erster Druckraum für die Druckflüssigkeit, eine zur Veränderung des Volumens dieses Druckraumes bewegbare Kolbenanordnung und mindestens ein zweiter Druckraum vorhanden. Der zweite Druckraum ist für eine dem Arbeitsdruck im ersten Druckraum erzeugende Bewegung der Kolbenanordnung mit dem Umgebungsdruck der Tiefsee beaufschlagbar. Weiterhin ist ein der Zylinderanordnung zugeordneter Druckspeicher in Form eines Blasenspeichers vorgesehen, dessen bewegbares Trennelement einen mit dem Seewasser verbundenen Raum von einem Bewegungsraum trennt. Der Betätigungsraum enthält ein Betätigungsfluid und ist mit dem zweiten Druckraum in Verbindung, um diesen mittels des Betätigungsfluides mit dem Tiefseedruck zu beaufschlagen.To overcome these challenges, DE 10 2011 009 276 A1 a device for transmitting a hydraulic working pressure in a pressure fluid for pressure actuation of hydraulic devices of deep-sea systems, in particular deep-water wells, suggested. A cylinder arrangement contains a first pressure chamber for the pressure fluid, a piston arrangement that can be moved to change the volume of this pressure chamber, and at least one second pressure chamber. The second pressure chamber can be subjected to the ambient pressure of the deep sea for a movement of the piston arrangement that generates the working pressure in the first pressure chamber. Furthermore, a pressure accumulator associated with the cylinder arrangement is provided in the form of a bladder accumulator, the movable separating element of which separates a space connected to the seawater from a movement space. The actuation chamber contains an actuation fluid and is connected to the second pressure chamber in order to apply the deep-sea pressure to it by means of the actuation fluid.

Die GB 1 305 990 A beschreibt eine Vorrichtung mit den Merkmalen im Oberbegriff von Anspruch 1 zum Einstellen eines Mediendruckes gegenüber einem Umgebungsdruck, der bei einem Einsatz der Vorrichtung durch einen tiefenabhängigen Seewasserdruck vorgegeben ist, wobei der Seewasserdruck auf eine Kompensatoreinrichtung einwirkt, die eine umkehrbare Längen- oder Dehnungsänderung erlaubt, wobei in Richtung der Längen- oder Dehnungsänderung in Folge mindestens zwei Kompensatorelemente der Kompensatoreinrichtung vorhanden sind, wobei im Einsatzfall zumindest eine stirnseitige Abschlusswand einer Druckübersetzungseinrichtung einem Seewasserangriff ausgesetzt ist, wobei die Druckübersetzungseinrichtung eine Doppelkolbenanordnung aufweist, die mit ihrem einen Kolben an den Seewasserraum und mit ihrem anderen Kolben an den Medienraum angrenzt, wobei die Doppelkolbenanordnung axial in einem Aufnahmegehäuse bewegbar geführt ist, wobei eine Innenwand des Aufnahmegehäuses eine Lauffläche für die Kolben bildet, wobei die Vorrichtung ein Rohr umfasst, welches das Aufnahmegehäuse bildet, wobei die Kompensatoreinrichtung auf der Innenseite des Aufnahmegehäuses zwischen einem Kolben der Doppelkolbenanordnung und einer Eintrittsstelle des Rohrs vorgesehen ist, und wobei die stirnseitige Abschlusswand gegenüber der Eintrittsstelle für Seewasser in Richtung der Druckübersetzungseinrichtung zurückversetzt ist.the GB 1 305 990 A describes a device with the features in the preamble of claim 1 for setting a medium pressure in relation to an ambient pressure, which is predetermined when the device is used by a depth-dependent sea water pressure, the sea water pressure acting on a compensator device that allows a reversible change in length or expansion, wherein there are at least two compensator elements of the compensator device in the direction of the change in length or expansion as a result, with at least one end wall of a pressure booster device being exposed to seawater attack when it is used, with the pressure booster device having a double-piston arrangement which has one piston on the seawater space and the other piston Piston adjacent to the media space, wherein the double piston assembly is guided axially movable in a receiving housing, wherein an inner wall of the receiving housing forms a running surface for the piston, wherein the The device comprises a tube which forms the receiving housing, the compensator device being provided on the inside of the receiving housing between a piston of the double-piston arrangement and an entry point of the tube, and wherein the end wall is set back in the direction of the pressure boosting device compared to the point of entry for sea water.

Weitere Vorrichtungen zum Einstellen eines Mediendruckes gegenüber einem Umgebungsdruck gehen aus der GB 2 328 492 A , der US 2012/ 0291688 A1 , der US 2011/0203379 A1 , der US 3 552 419 , der CN 102 678 680 A , der US 2 722 188 und der US 2005/0155658 A1 hervor. Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung zum Einstellen eines Mediendruckes gegenüber einem Umgebungsdruck bereitzustellen, die sich insbesondere beim Einsatz unter Wasser als robust erweist und kostengünstig in der Herstellung ist sowie bei Bedarf einfach austauschbar ist.Other devices for setting a media pressure compared to an ambient pressure go from GB 2 328 492 A , the U.S. 2012/0291688 A1 , the U.S. 2011/0203379 A1 , the U.S. 3,552,419 , the CN 102 678 680 A , the U.S. 2,722,188 and the U.S. 2005/0155658 A1 out. Proceeding from this state of the art, the object of the invention is to provide a device for adjusting a media pressure in relation to an ambient pressure, which has proven to be robust, particularly when used under water, is inexpensive to manufacture and can be easily replaced if necessary.

Eine Lösung dieser Aufgabe besteht in einer Vorrichtung mit den Merkmalen von Anspruch 1. Vorteilhafte Ausführungsformen der Erfindung gehen aus den Unteransprüchen 2 bis 9 hervor.A solution to this problem consists in a device with the features of claim 1. Advantageous embodiments of the invention emerge from the subclaims 2-9.

Erfindungsgemäß ist vorgesehen, dass die Kompensatoreinrichtung aus einem Faltenbalg gebildet ist; dass die Kompensatorelemente aus einzelnen in Hintereinanderabfolge angeordneten Balgfalten gebildet sind, die zumindest teilweise die Wand des Faltenbalges ausbilden; dass der Faltenbalg an seinem einen freien Ende mit dem Rohr im Bereich der Eintrittsstelle verschweißt ist; und dass der Faltenbalg am anderen Ende im Betrieb mit Vorspannung am äußeren Umfangsrand der angrenzenden Stirnseite des seewasserraumseitigen Kolbens lose anliegt.According to the invention it is provided that the compensator device is formed from a bellows; that the compensator elements are formed from individual bellows folds arranged one behind the other, which at least partially form the wall of the bellows; that the bellows is welded at its one free end to the pipe in the area of the entry point; and that the bellows rests loosely at the other end during operation with pretension on the outer peripheral edge of the adjoining end face of the piston on the sea water side.

Es ist ferner vorgesehen, dass in Richtung der Längen- oder Dehnungsänderung in Folge mindestens zwei Kompensatorelemente der Kompensatoreinrichtung vorhanden sind.Provision is also made for at least two compensator elements of the compensator device to be present in sequence in the direction of the change in length or expansion.

Durch die Kompensatoreinrichtung wird die Vorrichtung zumindest teilweise vor dem korrosiv wirkenden Seewasser geschützt. Überraschenderweise hat sich zudem gezeigt, dass der Einsatz einer derartigen Kompensatoreinrichtung kostengünstig ist, wenn dadurch teure Komponenten nicht in Kontakt mit dem Seewasser kommen und somit geschont werden. Ferner wird durch die in Reihenschaltung von zwei oder mehr Kompensatorelementen eine Redundanz bewirkt. Außerdem haben sich derartige Kompensatorelemente als robuster als der aus dem Stand der Technik bekannte Blasenspeicher erwiesen.The compensator device protects the device at least partially from the corrosive seawater. Surprisingly, it has also been shown that the use of such a compensator device is inexpensive if expensive components do not come into contact with the seawater and are therefore protected. Furthermore, redundancy is brought about by connecting two or more compensator elements in series. In addition, such compensator elements have proven to be more robust than the bladder accumulator known from the prior art.

Mit der erfindungsgemäßen Lösung kann der Mediendruck derart eingestellt werden, dass eine Kompensation des Seewasserdruckes gegenüber einem hydraulischen Arbeitsdruck im fluidischen Kreis einer an die Vorrichtung angeschlossenen hydraulischen Arbeitsgerätschaft, insbesondere eines Blowout Preventers, erreichbar ist. Darüber hinaus kann die Einstellung des Mediendrucks genutzt werden, um mit dem Seewasserdruck den Betriebsdruck des fluidischen Arbeitskreises vorzuspannen, um im Bedarfsfall, beispielsweise in einer Notsituation, den vorgespannten und somit sehr hohen Arbeitsdruck, der im Wesentlichen dem Seewasserdruck entspricht, unmittelbar für die Betätigung der angeschlossenen Arbeitsgerätschaft zu verwenden.With the solution according to the invention, the media pressure can be adjusted in such a way that the seawater pressure can be compensated for with respect to a hydraulic working pressure in the fluidic circuit of a hydraulic working device connected to the device, in particular a blowout preventer. In addition, the setting of the media pressure can be used to preload the operating pressure of the fluidic working circuit with the sea water pressure in order to use the preloaded and therefore very high working pressure, which essentially corresponds to the sea water pressure, directly for the actuation of the connected work equipment.

Die jeweiligen Kompensatorelemente sind vorteilhaft zumindest teilweise federelastisch oder sonst elastisch ausgebildet und erfahren ausgehend von einer Ausgangsstellung mittels des Seewasserdruckes in einer Richtung die Längen- oder Dehnungsänderung und sind bei Wegnahme des Seedruckes in umgekehrter Bewegung in Richtung dieser Ausgangsstellung rückbewegbar. Diese Ausführungsform erlaubt den Einsatz auch bei unterschiedlichen Seewasserdrücken. Mithin ist die Vorrichtung auch auf unterschiedlichen Tiefen einsetzbar. Weiterhin erlaubt die Elastizität der Kompensatorelemente den mehrfachen Einsatz der Vorrichtung.The respective compensator elements are advantageously at least partially resilient or otherwise elastic and, starting from an initial position, experience the change in length or expansion in one direction by means of the sea water pressure and can be moved back in the opposite direction in the direction of this initial position when the sea pressure is removed. This embodiment also allows use with different seawater pressures. Consequently, the device can also be used at different depths. Furthermore, the elasticity of the compensator elements allows multiple use of the device.

Die Kompensatoreinrichtung ist aus einem Faltenbalg gebildet und die Kompensatorelemente sind aus einzelnen in Hintereinanderabfolge angeordneten Balgfalten gebildet, die zumindest teilweise die Wand des Faltenbalges ausbilden. Ein solcher Faltenbalg hat sich für den Einsatz in der Tiefsee als besonders robust und langlebig erwiesen. Ein weiterer Vorteil ist, dass die Vorrichtung auch bei sehr hohem Druck des Seewassers einwandfrei funktioniert und dass hierbei keine Diffusion durch den Faltenbalg hindurch stattfinden kann.The compensator device is formed from a bellows and the compensator elements are formed from individual bellows folds arranged one behind the other, which at least partially form the wall of the bellows. Such a bellows has proven to be particularly robust and durable for use in the deep sea. Another advantage is that the device works perfectly even at very high seawater pressure and that no diffusion through the bellows can take place.

Im Einzelfall ist zumindest eine stirnseitige Abschlusswand des Faltenbalges und/oder eine Druckübersetzungseinrichtung einem Seewasserangriff ausgesetzt und diese Abschlusswand ist gegenüber einer Eintrittsstelle für das Seewasser in Richtung der Druckübersetzungseinrichtung zurückversetzt. Eine solche stirnseitige Abschlusswand ermöglicht eine Abschirmung der Druckübersetzungseinrichtung gegenüber dem Seewasser. Zudem sind zumindest Teile der erfindungsgemäßen Vorrichtung gegenüber dem Seewasser geschützt.In individual cases, at least one end wall of the bellows and/or a pressure boosting device is exposed to seawater attack and this closing wall is set back in the direction of the pressure boosting device compared to an entry point for the seawater. Such a front end wall enables the pressure boosting device to be shielded from the sea water. In addition, at least parts of the device according to the invention are protected from seawater.

Besonders vorteilhaft stellt die Druckübersetzungseinrichtung zumindest einen mediendichten Abschluss zwischen dem Seewasserraum mit dem Seewasserdruck und dem Medienraum mit dem Mediendruck innerhalb des Aufnahmegehäuses her. Auf diese Weise ist der Medienraum sicher vom Seewasserraum getrennt. Es kann nicht zu einem Übertritt der jeweiligen Medien kommen. Mithin werden Beschädigungen von nachgeschalteten Einheiten, die nur mit dem Medium und nicht mit dem Seewasser in Kontakt kommen dürfen, verhindert.Particularly advantageously, the pressure boosting device creates at least a media-tight seal between the sea water space with the sea water pressure and the media space with the media pressure within the receiving housing. In this way, the media room is safely separated from the seawater room. The respective media cannot be transferred. This prevents damage to downstream units that may only come into contact with the medium and not with the seawater.

In einer Wirkkette und vorzugsweise in Längsrichtung des Aufnahmegehäuses gesehen können sich vorteilhaft an die Kompensatoreinrichtung die Druckübersetzungseinrichtung und dann der Medienraum anschließen. Dieser Aufbau ist besonders kompakt und zeichnet vorteilhaft sich dadurch aus, dass die Bewegungseinrichtung innerhalb der Vorrichtung einheitlich ist und nicht durch mechanische oder hydraulische Zwischenglieder umgelenkt werden muss. Derartige Kraftübertragungen mit Richtungsänderungen sind regelmäßig mit Energieverlusten verbunden, die bei der erfindungsgemäßen Vorrichtung vermieden werden.Viewed in an effective chain and preferably in the longitudinal direction of the receiving housing, the pressure boosting device and then the media chamber can advantageously be connected to the compensator device. This structure is particularly compact and is advantageously characterized in that the moving device is uniform within the device is and does not have to be deflected by mechanical or hydraulic intermediate links. Such power transmissions with changes in direction are regularly associated with energy losses, which are avoided with the device according to the invention.

Die Druckübersetzungseinrichtung weist einen Doppelkolben auf, der mit seinem einen Kolben an den Seewasserraum angrenzt und mit seinem anderen Kolben an den Medienraum. Ein solcher Doppelkolben hat den Vorteil, dass ein Zwischenraum zwischen den beiden Druckräumen gebildet wird, der zur zusätzlichen Abdichtung genutzt werden kann.The pressure boosting device has a double piston, one piston of which adjoins the seawater space and the other piston adjoins the media space. Such a double piston has the advantage that an intermediate space is formed between the two pressure chambers, which can be used for additional sealing.

Vorteilhaft ist zwischen den Kolben der Doppelkolbenanordnung mindestens ein weiterer zweiter Medienraum angeordnet, der ein Hochdruckmedium aufnimmt. Bei dem Hochdruckmedium kann es sich um ein Arbeitsgas, insbesondere Stickstoff (N2), handeln, das unter einem Druck von mindestens 1 bar, weiter bevorzugt mindestens 100 bar, weiter bevorzugt mindestens 200 bar, weiter bevorzugt mindestens 300 bar, weiter bevorzugt 400 bar, steht.Advantageously, at least one further, second medium chamber, which accommodates a high-pressure medium, is arranged between the pistons of the double-piston arrangement. The high-pressure medium can be a working gas, in particular nitrogen (N 2 ), which is under a pressure of at least 1 bar, more preferably at least 100 bar, more preferably at least 200 bar, more preferably at least 300 bar, more preferably 400 bar , stands.

Der zweite Medienraum mit dem Hochdruckmedium ist mit Vorteil an einen Druckvorratsraum permanent angeschlossen. Der Druckvorratsraum kann das Aufnahmegehäuse konzentrisch umfassen. Diese Anordnung ist hinsichtlich der effizienten Nutzung des Bauraums vorteilhaft, weil sie besonders kompakt ist. Durch den Anschluss eines erweiterten Druckvorratsraums kann zudem ein höherer Druck über einen längeren Hubweg bereitgestellt werden. Auf diese Weise wird das Medium im ersten Medienraum sowohl durch den Umgebungsdruck des Seewassers als auch durch den Druck des Hochdruckmediums beaufschlagt. Der zweite Medienraum und/oder der Druckvorratsraum können auch außerhalb der Vorrichtung durch ein an die Vorrichtung anschließbares Drittbauteil, beispielsweise in Form einer separaten Speicheranordnung, gebildet sein.The second medium space with the high-pressure medium is advantageously permanently connected to a pressure reservoir. The pressure reservoir may concentrically enclose the receiving housing. This arrangement is advantageous in terms of efficient use of the installation space because it is particularly compact. By connecting an extended pressure reservoir, a higher pressure can also be provided over a longer stroke. In this way, the medium in the first media space is acted upon both by the ambient pressure of the seawater and by the pressure of the high-pressure medium. The second media space and/or the pressure reservoir can also be formed outside of the device by a third component that can be connected to the device, for example in the form of a separate storage arrangement.

Zwischen den Kolben der Doppelkolbenanordnung kann mindestens ein weiterer dritter Medienraum angeordnet sein, der ein Niederdruckmedium, insbesondere in Form eines Vakuums, aufnimmt. Der zweite und dritte Medienraum können von einer Kolbentrennwand begrenzt sein, in der eine Kolbenstange längsverfahrbar geführt ist, an deren jeweiligen Endbereich einer der Kolben der Kolbenanordnung befestigt ist. Durch das Niederdruckmedium, insbesondere ein Arbeitsgas, wie Stickstoff (N2), oder das Vakuum wird der Kolben, der mit dem Umgebungsdruck des Meerwassers beaufschlagt ist, auf der gegenüberliegenden Seite druckentlastet. Somit wird der Bewegung des Kolbens ein geringerer oder gar kein Widerstand entgegengesetzt, wenn das Medium aus dem ersten Medienraum abgerufen wird. Insbesondere steht das Niederdruckmedium im dritten Medienraum unter einem Druck, der niedriger als 1 bar, bevorzugt niedriger als 0,5 bar, ist.At least one further, third medium space can be arranged between the pistons of the double-piston arrangement, which medium accommodates a low-pressure medium, in particular in the form of a vacuum. The second and third media space can be delimited by a piston partition wall, in which a piston rod is guided in a longitudinally displaceable manner, and one of the pistons of the piston arrangement is fastened to the respective end region of the piston rod. The low-pressure medium, in particular a working gas such as nitrogen (N 2 ), or the vacuum relieves the pressure on the piston, which is subjected to the ambient pressure of the sea water, on the opposite side. Thus, there is less or no resistance to the movement of the piston when the medium is retrieved from the first medium chamber. In particular, the low-pressure medium in the third media space is under a pressure of less than 1 bar, preferably less than 0.5 bar.

Der Faltenbalg, die Kolben und die Kolbentrennwand können bevorzugt einen jeweils maximalen Außendurchmesser aufweisen, der gleich ist und einem gleichförmig verlaufenen Innenwanddurchmesser des Aufnahmegehäuses entspricht. Auf diese Weise kann das Aufnahmegehäuse rohrförmig ausgeführt sein. Das Aufnahmegehäuse ist somit besonders kostengünstig in der Herstellung und druckstabil gegenüber Umgebungsdruckeinflüssen.The bellows, the pistons and the piston partition wall can preferably each have a maximum outside diameter which is the same and corresponds to a uniformly running inside wall diameter of the receiving housing. In this way, the receiving housing can be of tubular design. The receiving housing is therefore particularly cost-effective to manufacture and is pressure-stable with respect to the influences of ambient pressure.

Zumindest der seewasserraumseitige Kolben der Doppelkolbenanordnung ist vorteilhaft gegenüber einer Innenwand des Aufnahmegehäuses mittels einer Dichteinrichtung abgedichtet. Auf diese Weise wird ein Eindringen des Seewassers in die Doppelkolbenanordnung vermieden. Weiterhin wird ein Austritt von Medium oder Arbeitsgas aus der Doppelkolbenanordnung in Richtung des Seewassers verhindert.At least the seawater space-side piston of the double piston arrangement is advantageously sealed off from an inner wall of the receiving housing by means of a sealing device. In this way, seawater is prevented from penetrating into the double-piston arrangement. Furthermore, medium or working gas is prevented from escaping from the double-piston arrangement in the direction of the seawater.

Die Erfindung ist nachfolgend anhand von einem in einer Figur dargestellten Ausführungsbeispiel näher erläutert. Es zeigen:

Fig. 1
eine erfindungsgemäße Vorrichtung in einer perspektivischen Längsansicht, die teilweise geschnitten wiedergegeben ist; und
Fig. 2
ein Ausschnitt aus dem Faltenbalg der Fig. 1 im Längsschnitt.
The invention is explained in more detail below with reference to an embodiment shown in a figure. Show it:
1
a device according to the invention in a perspective longitudinal view, which is shown partially in section; and
2
a section of the bellows of the 1 in longitudinal section.

In der Figur ist die Vorrichtung 1 zum Einstellen eines Mediendruckes gegenüber einem Umgebungsdruck, der bei einem Einsatz der Vorrichtung 1 durch einen tiefenabhängigen Druck eines Seewassers vorgegeben ist, dargestellt. Die Vorrichtung 1 besteht im Wesentlichen aus zwei konzentrischen Rohren 3, 5, die endseitig durch Ringelemente 7, 9 auf Abstand gehalten werden. Im inneren Rohr 5, das ein Aufnahmegehäuse bildet, ist ein erster Medienraum vorgesehen, der durch eine endseitige Scheibe 13 abgeschlossen ist. In der Scheibe 13 ist eine axiale Bohrung 15 zur Überleitung von einem Medium aus dem ersten Medienraum 11 in einen nachgeschalteten, nicht näher dargestellten Hydraulikkreis mit angeschlossener Arbeitsgerätschaft, beispielsweise in Form eines Blowout Preventers, vorgesehen. Der Medienraum 11 ist durch eine Druckübersetzungseinrichtung 17 in Form einer Doppelkolbenanordnung 19 beaufschlagbar, deren in der Bildebene rechter Kolben 21 an den ersten Medienraum 11 angrenzt. Die Doppelkolbenanordnung 19 ist axial im Aufnahmegehäuse 5 bewegbar geführt, wobei eine Innenwand 23 des Aufnahmegehäuses 5 eine Lauffläche 25 für die Kolben 21, 27 bildet. Der in der Bildebene linke Kolben 27 der Doppelkolbenanordnung 19 ist als stirnseitige Abschlusswand 29 im Betrieb der Vorrichtung mit Seewasser beaufschlagbar. Diese Abschlusswand 29 ist gegenüber einer Eintrittsstelle 31 des Seewassers in Richtung der Druckübersetzungseinrichtung 17 zurückversetzt. Die Druckübersetzungseinrichtung 17 stellt somit einen mediendichten Abschluss zwischen einem Seewasserraum 33 mit dem Seewasserdruck und dem Medienraum 11 mit dem Mediendruck innerhalb des gemeinsamen Aufnahmegehäuses 5 her.The figure shows the device 1 for setting a media pressure in relation to an ambient pressure, which is predetermined when the device 1 is used by a depth-dependent pressure of sea water. The device 1 consists essentially of two concentric tubes 3, 5, which are held at the end by ring elements 7, 9 at a distance. In the inner tube 5, which forms a receiving housing, a first medium space is provided, which is closed off by a disc 13 at the end. An axial bore 15 is provided in the disc 13 for the transfer of a medium from the first medium space 11 into a downstream hydraulic circuit, not shown in detail, with attached working equipment, for example in the form of a blowout preventer. The media space 11 can be acted upon by a pressure boosting device 17 in the form of a double piston arrangement 19 , the piston 21 of which is on the right in the plane of the drawing and is adjacent to the first media space 11 . The double piston arrangement 19 is guided in an axially movable manner in the receiving housing 5, with an inner wall 23 of the receiving housing 5 forming a running surface 25 for the pistons 21, 27. The piston 27 on the left in the plane of the drawing of the double piston arrangement 19 can be acted upon by seawater as the end wall 29 when the device is in operation. This closing wall 29 is set back in the direction of the pressure boosting device 17 in relation to an entry point 31 for the sea water. The pressure boosting device 17 thus creates a media-tight seal between a sea water space 33 with the sea water pressure and the media space 11 with the media pressure within the common receiving housing 5 .

Auf der Innenseite des Aufnahmegehäuses 5 ist zwischen dem linken Kolben 27 und der Eintrittsstelle 31 des inneren Rohrs 5 eine Kompensatoreinrichtung 35 vorgesehen. Der Seewasserdruck wirkt auf die Kompensatoreinrichtung 35 ein, die eine umkehrbare Längen- oder Dehnungsänderung erlaubt. Die Kompensatoreinrichtung 35 ist aus einem Faltenbalg 39 gebildet. Der Faltenbalg 39 besteht aus korrosionsbeständigen Edelstahlmaterialien. An seinem einen freien Ende ist der Faltenbalg 39 mit dem inneren Rohr 5 im Bereich der Eintrittsstelle 31 verschweißt. Am anderen Ende liegt der Faltenbalg 39 im Betrieb mit Vorspannung am äußeren Umfangsrand der angrenzenden Stirnseite des linken Kolbens 27 vorzugsweise lose an. Vorzugsweise ist jedoch vorgesehen, dass zwischen Faltenbalg 39 und der insoweit zuordenbaren Innenwand 23 des Rohres 5 zusätzlich eine Stützflüssigkeit eingebracht ist, beispielsweise in Form einer Alkoholverbindung (Glykol), die die Abstände zwischen den Balgfalten aussteift und insoweit abstützt. Ein Teil der Stützflüssigkeit befindet sich auch als eine Art Nachführmenge zum Ausgleich von Volumenschwankungen beim Bewegen des Feder- oder Faltenbalges 39 zwischen dessen geschlossenem bodenseitigen Ende und der benachbarten Stirnwand 29 des in Blickrichtung auf die Fig. 1 gesehen äußerst linken Kolbens 27. Der Faltenbalg 39 ist koaxial zur Druckübersetzungseinrichtung 17 angeordnet.A compensator device is located on the inside of the receiving housing 5 between the left-hand piston 27 and the entry point 31 of the inner tube 5 35 provided. The seawater pressure acts on the compensator device 35, which allows a reversible change in length or expansion. The compensator device 35 is formed from a bellows 39 . The bellows 39 is made of corrosion resistant stainless steel materials. At its one free end, the bellows 39 is welded to the inner tube 5 in the area of the entry point 31 . At the other end, the bellows 39 preferably rests loosely on the outer peripheral edge of the adjoining end face of the left-hand piston 27 during operation with pretension. However, it is preferably provided that a supporting liquid is additionally introduced between the bellows 39 and the extent assignable inner wall 23 of the tube 5, for example in the form of an alcohol compound (glycol), which stiffens the distances between the bellows folds and supports them to this extent. A part of the supporting liquid is also located as a kind of replenishment amount to compensate for volume fluctuations when moving the spring or bellows 39 between its closed bottom end and the adjacent end wall 29 of the in the direction of view 1 Seen extreme left piston 27. The bellows 39 is arranged coaxially to the pressure booster device 17.

Erfindungsgemäß sind in Richtung der Längen- oder Dehnungsänderung in Folge mehrere Kompensatorelemente 41 der Kompensatoreinrichtung 35 vorgesehen. Die Kompensatorelemente 41 sind aus einzelnen in Hintereinanderabfolge angeordneten, im Längsschnitt trapezförmigen Balgfalten gebildet. Die Balgfalten 41 bilden eine Wand 43 des Faltenbalges 39 aus. Sie kontaktieren außenseitig die Innenwand 23 des Aufnahmegehäuses 5. Die jeweiligen Kompensatorelemente 41 sind federelastisch. Ausgehend von einer Ausgangsstellung erfahren die Kompensatorelemente 41 mittels des Seewasserdruckes in einer Richtung die Längen- oder Dehnungsänderung. Bei Wegnahme des Seewasserdruckes sind die Kompensatorelemente in umgekehrter Bewegung in Richtung der Ausgangsstellung rückbewegbar. Das Arbeitsvermögen der Vorrichtung und das Volumen des Seewasserraums sind somit durch die Anzahl und die Form der Balgfalten 41 zumindest teilweise vorgebbar. Der in den Fig. 1 und 2 gezeigte Balg 39 ist aus einem Elastomermaterial (Gummi) gebildet, das gegenüber dem korrosiv wirkenden Seewasser beschichtet sein kann. Anstelle des Elastomer-Balges kann auch ein solcher aus Stahlmaterialien, vorzugsweise in Form von Edelstahl, treten, der dann nicht rostet. Im dahingehenden Fall sind die Balgfalten aber dann nicht, wie gezeigt, trapezförmig ausgebildet, sondern mit entsprechenden gleichmäßigen Rundungen (nicht dargestellt) versehen.According to the invention, several compensator elements 41 of the compensator device 35 are provided in sequence in the direction of the change in length or expansion. The compensator elements 41 are formed from individual bellows folds which are arranged one behind the other and are trapezoidal in longitudinal section. The bellows folds 41 form a wall 43 of the bellows 39 . They contact the inner wall 23 of the receiving housing 5 on the outside. The respective compensator elements 41 are resilient. Starting from an initial position, the compensator elements 41 experience the change in length or expansion in one direction by means of the seawater pressure. When the seawater pressure is removed, the compensator elements can be moved back in the opposite direction towards the starting position. The working capacity of the device and the volume of the sea water space are thus at least partially predetermined by the number and shape of the bellows folds 41 . The in the 1 and 2 The bellows 39 shown is formed from an elastomeric material (rubber) which can be coated against the corrosive effect of sea water. Instead of the elastomer bellows, one made of steel materials, preferably in the form of stainless steel, can also be used, which then does not rust. In this case, however, the bellows folds are not trapezoidal, as shown, but are provided with corresponding, even curves (not shown).

In einer Wirkkette und in Längsrichtung LR des Aufnahmegehäuses 5 gesehen schließen sich an die Kompensatoreinrichtung 35 die Druckübersetzungseinrichtung 17 und dann der Medienraum 11 an. Zwischen den Doppelkolben 21, 27 der Druckübersetzungseinrichtung 17 ist ein zweiter Medienraum 45 angeordnet, der ein Hochdruckmedium aufnimmt. Bei diesem Hochdruckmedium handelt es sich um ein Arbeitsgas, speziell um Stickstoff (N2). Der zweite Medienraum 45 mit dem Hochdruckmedium ist an einen Druckvorratsraum 47, der sich zwischen dem inneren Rohr 5 und dem äußeren Rohr 3 befindet, permanent über eine Bohrung 49 im inneren Rohr 5 angeschlossen. Der Druckvorratsraum 47 umfasst das Aufnahmegehäuse 5 konzentrisch. Zwischen den Doppelkolben 21, 27 ist ein weiterer dritter Medienraum 51 angeordnet, der ein Niederdruckmedium in Form eines Arbeitsgases, hier Stickstoff (N2), aufnimmt, vorzugsweise jedoch ein Vakuum aufnimmt. Der zweite und der dritte Medienraum 45, 51 sind von einer ortsfest im Aufnahmegehäuse 5 angeordneten Kolbentrennwand 53 begrenzt. In einer Bohrung 55 der Kolbentrennwand 53 ist eine Kolbenstange 57 längsverfahrbar geführt, an deren jeweiligen Endbereich ein Kolben 21, 27 der Doppelkolbenanordnung 19 befestigt ist. Die Kolben 21, 27 der Doppelkolbenanordnung 19 und die Kolbentrennwand 53 weisen jeweils zwei Umfangsnuten 59 auf, in denen ringförmige Dichtelemente 61 als Dichtanordnungen zur Abdichtung gegenüber der Innenwand 23 des Aufnahmegehäuses 5 angeordnet sind. Weiterhin sind in der Bohrung 55 in der Kolbentrennwand zwei Innenumfangsnuten 63 vorgesehen, in denen ebenfalls zwei Dichtelemente 65 angeordnet sind. Auf diese Weise sind die Medienräume 11, 45, 51 und der Seewasserraum 33 mediendicht voneinander separiert. Insbesondere ist durch die Dichtelemente 61 verhindert, dass die Stützflüssigkeit des Balges 39 auf die Medienraumseite 51 treten kann.In an effective chain and seen in the longitudinal direction LR of the receiving housing 5 , the pressure boosting device 17 and then the media space 11 follow the compensator device 35 . Between the double pistons 21, 27 of the pressure boosting device 17, a second medium chamber 45 is arranged, which receives a high-pressure medium. This high-pressure medium is a working gas, specifically nitrogen (N 2 ). The second medium chamber 45 with the high-pressure medium is permanently connected to a pressure reservoir 47 , which is located between the inner tube 5 and the outer tube 3 , via a bore 49 in the inner tube 5 . The pressure reservoir 47 surrounds the receiving housing 5 concentrically. A further, third medium chamber 51 is arranged between the double pistons 21, 27 and accommodates a low-pressure medium in the form of a working gas, here nitrogen (N 2 ), but preferably accommodates a vacuum. The second and third media chambers 45, 51 are delimited by a piston partition wall 53 arranged in a stationary manner in the receiving housing 5. A piston rod 57 is guided in a longitudinally displaceable manner in a bore 55 of the piston partition wall 53, and a piston 21, 27 of the double-piston arrangement 19 is fastened to the respective end region of said piston rod. The pistons 21, 27 of the double piston arrangement 19 and the piston partition wall 53 each have two circumferential grooves 59 in which ring-shaped sealing elements 61 are arranged as sealing arrangements for sealing against the inner wall 23 of the receiving housing 5. Furthermore, in the bore 55 in the Piston partition two inner peripheral grooves 63 are provided, in which two sealing elements 65 are also arranged. In this way, the media spaces 11, 45, 51 and the seawater space 33 are separated from one another in a media-tight manner. In particular, the sealing elements 61 prevent the supporting liquid of the bellows 39 from being able to get onto the side 51 of the media space.

Der Faltenbalg 39, die Kolben 21, 27 und die Kolbentrennwand 53 weisen jeweils einen maximalen Außendurchmesser A auf, der gleich ist und dem gleichförmig verlaufenden Innenwanddurchmesser I des Aufnahmegehäuses 5 entspricht.The bellows 39, the pistons 21, 27 and the piston partition wall 53 each have a maximum outer diameter A which is the same and corresponds to the inner wall diameter I of the receiving housing 5 which runs uniformly.

In der Fig. 2 ist der Faltenbalg 39 aus Elastomermaterial im eingebauten Zustand im Detail schematisch dargestellt. Jede Balgfalte 41 ist aus zwei im selben Winkel aufeinander zu geneigten Flanken 67, 69 gebildet, die in fiktiver Verlängerung einen spitzen Winkel α miteinander einschließen, der auf der Innenseite 71 des Faltenbalges 39 liegt. Nach einer vorgebbaren Flankenstrecke 73 gehen die jeweils benachbarten Flanken 67, 69 einer Balgfalte 41 in Richtung der Innenseite 71 in koaxial zur Längsachse LA des Faltenbalges 39 verlaufende Bindungsbrücken 75 über, welche die benachbarten Flanken 67, 69 aussteifen und die im Übrigen mit den angrenzenden Bindungsbrücken 75 einen fiktiven Innentubus 77 innerhalb des Faltenbalgs 39 bilden. An ihrem Fuß 79 geht jede Flanke 67, 69 mit einem vorgebbaren Biegeradius r in eine ebenfalls koaxial zur Längsachse LA des Faltenbalges 39 verlaufende Anlagebrücke 81 über, die in jeder Bewegungsstellung des Faltenbalges 39 in gleitender Anlage an der Innenwand 23 des inneren Rohres 5 verbleibt. Alle Anlagebrücken 81 bilden wiederum einen fiktiven Außentubus 83 des Faltenbalges 39, der zum Innentubus 77 konzentrisch ist. Die Bindungsbrücken 75 und die Anlagebrücken 81 steifen den Faltenbalg 39 als Ganzes aus und bewirken, dass die Balg-Verformungsarbeit größtenteils oder ausschließlich durch flügelschlagartige Bewegungen der Flanken 67, 69 in Richtung der Füße 79 erbracht wird. Die jeweils benachbarten Füße 79 einer Balgfalte 41 bewegen sich bei einer Verkleinerung oder Vergrößerung des von der Balgfalte 41 begrenzten Volumens auf der Höhe des Außentubus 83 aufeinander zu oder voneinander weg je nachdem, ob der Faltenbalg 39 im Betrieb gestaucht oder gedehnt wird. Die Verformungsarbeit des Faltenbalges 39 wird mithin nur durch die Bewegung der sich federnd zurückstellenden Flanken 67, 69 geleistet. Zu diesem Zweck sind die Flanken 67, 69 über Gelenkstellen 85 mit den benachbarten Bindungsbrücken 75 verbunden. Dadurch ist gewährleistet, dass die Bindungsbrücken 75 ihre konzentrische Ausrichtung zueinander im Betrieb stets beibehalten. Der Faltenbalg 39 kann auch bei sehr hohen Seewasser- bzw. Arbeitsdrücken nicht oder zumindest nur gering beulen, so dass die Anlagebrücken 81 in jeder möglichen Verfahrstellung des Faltenbalges 39 in gleitender Anlage an der Innenwand 23 des inneren Rohres 5 verbleiben, die eine Führung für den Balg 39 bildet. Der Faltenbalg 39 und seine Balgfalten 41 sind rotationssymmetrisch zur Längsachse LA der Vorrichtung 1 ausgerichtet. Um Spannungen in den Balgfalten 41 zu vermeiden, sind die Anlagebrücken 81 und die Bindungsbrücken 75 gleich breit ausgebildet und mit der genannten Stützflüssigkeit verfüllt.In the 2 the bellows 39 made of elastomeric material is shown schematically in detail in the installed state. Each bellows fold 41 is formed from two flanks 67 , 69 which are inclined towards one another at the same angle and which, in fictitious extension, enclose an acute angle α with one another which lies on the inside 71 of the bellows 39 . After a definable flank section 73, the respective adjacent flanks 67, 69 of a bellows fold 41 merge in the direction of the inner side 71 into binding bridges 75 which run coaxially to the longitudinal axis LA of the bellows 39 and which stiffen the adjacent flanks 67, 69 and otherwise connect with the adjacent binding bridges 75 form a fictitious inner tube 77 within the bellows 39. At its base 79, each flank 67, 69 merges with a predeterminable bending radius r into a contact bridge 81, which also runs coaxially to the longitudinal axis LA of the bellows 39 and which remains in sliding contact with the inner wall 23 of the inner tube 5 in every movement position of the bellows 39. All contact bridges 81 in turn form an imaginary outer tube 83 of the bellows 39 which is concentric with the inner tube 77 . The binding bridges 75 and the contact bridges 81 stiffen the bellows 39 as a whole and cause the bellows deformation work to be carried out largely or exclusively by flapping movements of the flanks 67, 69 in the direction of the feet 79. The respective adjacent feet 79 of a bellows fold 41 move when they are reduced or increasing the volume defined by the bellows fold 41 at the level of the outer tube 83 towards or away from each other, depending on whether the bellows 39 is compressed or expanded during operation. The deformation work of the bellows 39 is therefore only performed by the movement of the resiliently restoring flanks 67, 69. For this purpose, the flanks 67, 69 are connected to the adjacent binding bridges 75 via hinge points 85. This ensures that the binding bridges 75 always maintain their concentric alignment with one another during operation. Even at very high seawater or working pressures, the bellows 39 cannot buckle, or at least only slightly, so that the contact bridges 81 remain in sliding contact with the inner wall 23 of the inner tube 5 in every possible travel position of the bellows 39, which provides a guide for the bellows 39 forms. The bellows 39 and its folds 41 are aligned rotationally symmetrically to the longitudinal axis LA of the device 1 . In order to avoid tension in the bellows folds 41, the contact bridges 81 and the binding bridges 75 are of the same width and are filled with the support liquid mentioned.

Die erfindungsgemäße Vorrichtung 1 ist dazu vorgesehen, als Teil eines Blowout Preventers auf den Meeresgrund herabgelassen zu werden. Der hohe Umgebungsdruck des Seewassers in z.B. 3600 m Tiefe in Höhe von 360 bar wirkt auf die Vorrichtung 1 ein. Das Seewasser beaufschlagt die Kompensatoreinrichtung 35 und den linken Kolben 27 der Druckübersetzungseinrichtung 17 und erzeugt im Medium im ersten Medienraum 11 einen korrespondierenden Druck. Zusätzlich ist das Medium im ersten Medienraum 11 vom Hochdruckmedium im zweiten Medienraum 45 beaufschlagt. Wird nun in einem Notfall das Medium aus dem ersten Medienraum 11 abgerufen, bewegt sich die Doppelkolbenanordnung 17 in der Bildebene nach rechts. Auf diese Weise erfährt die Kompensatoreinrichtung 35 eine Längenänderung, da sie endseitig an die Doppelkolbenanordnung 17 und an das Aufnahmegehäuse 5 gekoppelt ist. Durch die Kompensatoreinrichtung 35 wird die Innenwand des Aufnahmegehäuses 5 vorteilhaft unabhängig von der Position der Doppelkolbenanordnung 19 vor dem Kontakt mit dem korrosiv wirkenden Seewasser geschützt.The device 1 according to the invention is intended to be lowered onto the seabed as part of a blowout preventer. The high ambient pressure of the seawater at a depth of 3600 m, for example, amounting to 360 bar acts on the device 1 . The seawater acts on the compensator device 35 and the left-hand piston 27 of the pressure boosting device 17 and generates a corresponding pressure in the medium in the first medium space 11 . In addition, the medium in the first media space 11 is acted upon by the high-pressure medium in the second media space 45 . If the medium is now retrieved from the first medium chamber 11 in an emergency, the double piston arrangement 17 moves to the right in the image plane. In this way, the compensator device 35 experiences a change in length, since it is coupled at the end to the double piston arrangement 17 and to the receiving housing 5 . through the The compensator device 35 advantageously protects the inner wall of the receiving housing 5 from contact with the corrosive seawater, regardless of the position of the double piston arrangement 19 .

Durch die Erfindung wird somit eine besonders vorteilhafte Vorrichtung 1 zum Einstellen eines Mediendruckes gegenüber einem Umgebungsdruck aufgezeigt. Durch die Kompensatoreinrichtung 35 wird die Vorrichtung 1 zumindest teilweise vor dem korrosiv wirkenden Seewasser geschützt. Überraschenderweise hat sich zudem gezeigt, dass der Einsatz einer derartigen Kompensatoreinrichtung 35 kostengünstig ist, wenn dadurch teure Komponenten, wie die Innenwand 23 des Aufnahmegehäuses 5, nicht in Kontakt mit dem Seewasser kommen und somit geschont werden. Ferner wird durch die in Reihenschaltung von zwei oder mehr Kompensatorelementen 41 eine Redundanz bewirkt. Außerdem hat sich ein Faltenbalg 39 mit derartigen Kompensatorelementen 41 als robuster als ein aus dem Stand der Technik bekannter Blasenspeicher erwiesen. Vorzugsweise, was jedoch nicht dargestellt ist, kann ferner vorgesehen sein, dass die Gesamtvorrichtung gestuft ausgebildet ist, insbesondere dass der Seewasser-Druckübersetzungsteil mit Balg im Durchmesser kleiner ist als die Doppelkolbenanordnung. The invention thus shows a particularly advantageous device 1 for setting a medium pressure in relation to an ambient pressure. The compensator device 35 protects the device 1 at least partially from the corrosive seawater. Surprisingly, it has also been shown that the use of such a compensator device 35 is inexpensive if expensive components, such as the inner wall 23 of the receiving housing 5, do not come into contact with the seawater and are therefore protected. Furthermore, redundancy is brought about by the series connection of two or more compensator elements 41 . In addition, a bellows 39 with such compensator elements 41 has proven to be more robust than a bladder accumulator known from the prior art. Preferably, but this is not shown, it can also be provided that the entire device has a stepped design, in particular that the seawater pressure boosting part with the bellows has a smaller diameter than the double-piston arrangement.

Claims (9)

  1. Apparatus for adjusting a media pressure with respect to an ambient pressure which is defined, when using the apparatus, by a depth-dependent seawater pressure, wherein the seawater pressure acts on a compensator device (35), which allows a reversible change in length or elongation, wherein at least two compensator elements (41) of the compensator device (35) are provided in sequence in the direction of the change in length or elongation,
    wherein, in the application, at least one end wall (29) on the end face of a pressure intensifying device (17) is exposed to the effect of seawater, wherein the pressure intensifying device (17) comprises a double piston arrangement (19), which, with its one piston (27) forming the end wall (29) on the end face, is adjacent to a seawater chamber (33) and, with its other piston (21), is adjacent to a media chamber (11),
    wherein the double piston arrangement (19) is guided such that it can move axially in a receiving housing (5),
    wherein an inner wall (23) of the receiving housing (5) forms a running surface (25) for the pistons (21, 27),
    wherein the appliance comprises a cylinder (5), which forms the receiving housing,
    wherein the compensator device (35) is provided on the inside of the receiving housing (5) between the piston (27) on the seawater chamber side and an entrance point (31) to the cylinder (5), and
    wherein the end wall (29) on the end face is set back with respect to the entrance point (31) for seawater in the direction of the pressure intensifying device (17),
    wherein the compensator device (35) is formed by a bellows (39);
    wherein the compensator elements (41) formed by individual bellows pleats arranged in succession, which at least partially form the wall (43) of the bellows (39);
    wherein the bellows (39) is welded at its free end to the cylinder (5) in the region of the entrance point (31); and
    wherein, during operation with preloading, the other end of the bellows (39) is loosely in contact with the outer circumferential edge of the adjacent end face of the piston (27) on the seawater chamber side.
  2. Apparatus according to claim 1, wherein the respective compensator elements (41) are designed to be at least partially resiliently sprung or otherwise have a resilient construction and wherein, starting from an initial position, the compensator elements experience the change in length or elongation in one direction by means of seawater pressure and in the reverse movement when the seawater pressure is removed can be moved back in the direction of this initial position.
  3. Apparatus according to claim 1 or 2, wherein the pressure intensifying device (17) produces at least one media-tight seal between the seawater chamber (33) with the seawater pressure and the media chamber (11) with the media pressure inside the receiving housing (5).
  4. Apparatus according to any one of the preceding claims, wherein, in a process chain, and preferably viewed in the longitudinal direction (LR) of the receiving housing (5), the pressure intensifying device (17) and then the media chamber (11) are connected to the compensator device (35).
  5. Apparatus according to any one of the preceding claims, wherein at least one further second media chamber (45) is arranged between the double pistons (21, 27), said second media chamber receiving a high-pressure medium.
  6. Apparatus according to claim 5, wherein the second media chamber (45) with the high-pressure medium is permanently connected to a pressure supply chamber (47) and wherein the pressure supply chamber (47) preferably surrounds the receiving housing (5) in a concentric manner.
  7. Apparatus according to claim 5 or 6, wherein at least one further third media chamber (51) is arranged between the double pistons (21, 27), said third media chamber receiving a low-pressure medium, preferably a vacuum, and wherein the second media chamber (45) and the third media chamber (51) are delimited by a piston partition wall (53), in which a piston rod (57) is guided such that it can be displaced longitudinally, one of the pistons (21, 27) in the double piston arrangement (19) being attached to the respective end region thereof.
  8. Apparatus according to claim 7, wherein the bellows (39), the pistons (21, 27) and the piston partition wall (53) have a respective maximum outer diameter (A) which is identical and corresponds to an inner wall diameter (I) of the receiving housing (5) with the same shape.
  9. Apparatus according to any one of the preceding claims, wherein at least the piston (27) on the seawater chamber side of the double piston arrangement (19) is sealed with respect to the inner wall (23) of the receiving housing (5) by means of a sealing device (61).
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CN110645437B (en) * 2019-08-30 2021-07-02 安徽铜都流体科技股份有限公司 Corrugated pipe type plugging ball applied to slurry shield machine pipeline extension system
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CN105473808A (en) 2016-04-06
DE102013011115A1 (en) 2015-01-08
US9670746B2 (en) 2017-06-06
BR112015032886A2 (en) 2017-07-25
WO2015000565A3 (en) 2015-07-02
WO2015000565A2 (en) 2015-01-08
US20160138357A1 (en) 2016-05-19
EP3017140A2 (en) 2016-05-11
BR112015032886B1 (en) 2022-03-22
CN105473808B (en) 2019-07-05

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