EP2488762B1 - Hydropneumatic pressure accumulator - Google Patents

Hydropneumatic pressure accumulator Download PDF

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Publication number
EP2488762B1
EP2488762B1 EP10750058.9A EP10750058A EP2488762B1 EP 2488762 B1 EP2488762 B1 EP 2488762B1 EP 10750058 A EP10750058 A EP 10750058A EP 2488762 B1 EP2488762 B1 EP 2488762B1
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EP
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Prior art keywords
valve body
valve
pressure accumulator
projections
hydropneumatic pressure
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EP10750058.9A
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German (de)
French (fr)
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EP2488762A2 (en
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Norbert Lange
Norbert Weber
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Hydac Technology GmbH
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Hydac Technology GmbH
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Classifications

    • 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
    • F15B1/18—Anti-extrusion means
    • F15B1/20—Anti-extrusion means fixed to the separating means
    • 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
    • F15B1/22—Liquid port constructions
    • 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
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • 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
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/43—Anti-extrusion means
    • F15B2201/435—Anti-extrusion means being fixed to the separating means

Definitions

  • the invention relates to a hydropneumatic pressure accumulator having the features in the preamble of claim 1.
  • the gas-side working space is usually prefilled with a high biasing pressure working gas, in particular N 2 , which may be biasing pressures of the order of 100 bar.
  • a hydraulic system is connected to the housing opening having an oil connection in operation and the pressure of the hydraulic oil of the connected hydraulic system is in the range of the intended operating pressure, the flexible membrane in the region of the fluid pressure leading fluid chamber is so far from the inner wall of the storage housing that the Volume reduction, which results from the bulging of the membrane from the fluid-side inner wall of the storage housing, the original pre-charge po to a pressure p 1 (current working pressure) raises, wherein pressure equilibrium prevails on the membrane.
  • p 1 current working pressure
  • the closure of the housing opening is advantageous in that the diaphragm accumulator has no open housing opening prior to installation in a particular hydraulic system and after the desired full filling pressure has been established in the gas space, because the opening forming the oil connection is closed by the membrane.
  • the prefilled storage can therefore be handled, stored and transported, without any fear that impurities or foreign bodies could enter through the housing opening forming the oil connection.
  • the membrane in the region of oil pockets on the inner wall of the storage housing is not the entire surface, but the volume of the oil pockets correspondingly slightly lifted, resulting in a corresponding reduction in volume of the gas space compared to its determined by the geometry of the storage housing largest volume ,
  • the gas bias pressure in the gas space does not correspond to the predetermined value po but to a higher gas bias pressure.
  • the set pressure of the Memory ie, the opening pressure p 1 increases.
  • the valve assembly in an accumulator of the type mentioned in such a way that at the closed position a limited flow through the housing opening enabling bypass arrangement is formed.
  • the bypass arrangement is formed by the fact that at the serving as a valve seat for the valve body edge of the housing opening of the storage housing grooves are provided which are incorporated in the valve seat surface forming edge of the housing opening of the storage enclosure. The formation of the grooves requires an increased production cost in the manufacture of the housing.
  • there is a risk that material of the valve body is pressed into the grooves with a corresponding yielding of the material provided for the valve body, which would result in a tight closure of the valve arrangement and would make the bypass arrangement ineffective.
  • hydropneumatic pressure accumulators in the form of bellows accumulators are also known in the prior art.
  • bellows stores mentioned extends within the storage enclosure a seen in the longitudinal direction extendable bellows, which is connected at its one free end regularly with the inside of the storage enclosure and at its other free end usually a plate-like valve closure member, with which the oil fluid port of the storage enclosure closed, but can also be released.
  • a working gas in particular in the form of nitrogen gas, arranged.
  • a representative of the bellows storage solutions is in the EP 1 052 412 A2 shown, wherein protruding on the underside of the plate-shaped valve closing member to the fluid inlet opening of the storage housing, an annular elastomer sealing edge, which has the better stop damping because of individual ring-segment-like projections, but in their total extent in the fluid inlet opening shut-off closed this completely and completely.
  • the initially mentioned advantageous "bypass arrangement" is not achieved with the known bellows storage solution.
  • a generic hydropneumatic pressure accumulator is in the GB 604 731 A demonstrated.
  • the known solution has a valve arrangement which has a valve body acting on a surface portion of the diaphragm which, when approaching a valve seat located at the housing opening, transfers the valve arrangement to the closed position, with a bypass arrangement enabling a limited throughflow through the housing opening in this closed position , which has a spacer on its surface facing the valve seat, which allows the passage relative to the valve seat.
  • the valve body is designed in the form of two disk-shaped plates, which have between them a clamping fit for receiving the membrane surface portion and which are clamped against each other by means of a locking screw. This known clamping seat solution for the membrane builds complicated and as far as the operating behavior is concerned, the known solution leaves nothing to be desired.
  • the invention has the object to provide a pressure accumulator of the type considered available, which is characterized both by a particularly simple design and a particularly good performance.
  • valve body is designed such that it has at one of the valve seat facing surface bounding edge of the plane of this surface slightly projecting edge.
  • At least two projections may be provided on the surface of the valve body facing the valve seat, between which there is a passage enabling the intermediate space.
  • the arrangement may in this case be such that a plurality of projections are arranged distributed on the surface of the valve body in a regular position arrangement.
  • the projections form spacers which support the valve body in a tip-safe manner against the valve seat surface.
  • the projections may be arranged along a concentric circle, which runs a small distance from the peripheral edge of the surface, wherein the projections may be formed by a slotted ring body.
  • the slotted ring body may have four equal partial ring segments, between which there are intermediate spaces with a length which is smaller than half the circumferential length of the partial ring segments. This results in a favorable fürström despite sufficient stability of the spacers serving as projections.
  • the invention also provides a method for producing a hydropneumatic pressure accumulator according to the preamble of claim 1, wherein the method has the method steps and method features specified in claim 9.
  • the membrane 3 separates the housing 1 in its interior into a fluid space 5 and a gas space 7.
  • the housing 1 is, in the viewing direction Fig. 1 seen from an upper housing shell 9 and a lower housing shell 11, each having a circular shell shape with approximately hemispherical curved inner wall.
  • a gas connection 13 At the end of the storage housing 1 opposite the fluid space 5, ie the end associated with the gas space 7, there is a gas connection 13, via which the gas space 7 can be pre-filled with a working gas, in particular N 2 gas.
  • the end associated with the fluid space 5 has a housing opening 15 opening into the fluid space 5, to which an oil connection 17 is attached on the outside, via which the reservoir can be connected to a hydraulic system (not shown).
  • the Fig. 1 shows the diaphragm accumulator in an operating condition in which the diaphragm 3 is in an intermediate position in which there is pressure equilibrium on both sides in the diaphragm 3, because the hydraulic system connected to the oil connection 17 but not shown generates a fluid pressure in the fluid space 5, which is the in the gas space 7 prevailing pressure corresponds.
  • the membrane 3 moves, in viewing direction according to the Fig. 1 , downwards and abuts against the inside of the lower housing shell 11, the membrane 3 covering a valve seat 33 at the edge 31 of the housing opening 15 with a valve body 29 located at its central area.
  • valve body 29 forms part of a valve assembly.
  • the housing opening 15 is closed before the entire volume of oil has leaked 5, so that no oil pockets are formed by remaining residual volumes in the fluid space 5, the valve body 29, as on best that Fig. 2 to 5 can be removed, designed so that a bypass arrangement is formed, which allows a limited flow through the housing opening 15 in the closed position of the valve assembly, so that any residual volume of the oil can flow out of the fluid chamber 5.
  • specially formed projections projecting from the plane of the circular surface 34 are provided on the surface 34 facing the valve seat 33, their special shape being the clearest FIGS. 2 and 3 is removable.
  • the projections which form spacers relative to the valve seat 33, prevent direct contact of the surface 34 of the valve body 29 on the valve seat 33 FIGS. 2 and 3
  • the projections are formed by partial ring segments 37 of a slotted ring body extending along a concentric circle adjacent the rim 39 of the circular valve body 29. Between the partial ring segments 37, which each have the same length, there are in each case intermediate spaces 41, which likewise have the same length, so that the projections are arranged in a regular position arrangement on the surface 34. When in the closed position located valve assembly, as shown in the Fig. 5 1, the intermediate spaces 41 each form fluid paths for a limited throughflow between the fluid space 5 and the housing opening 15.
  • Fig. 2 to 4 can also be removed, have the partial ring segments 37, starting from its base on the surface 34 towards the free end, a tapered shape, which is formed by that on its radially outer side by a coaxial cylindrical surface 43 (see Fig. 2 and 4 ) and bounded on the inside by a conical surface 45, which by a narrow, parallel to the surface 34 of the valve body 29 end surface 47 are connected.
  • the length of the intermediate spaces 41 is less than half the circumferential length of the partial ring segments 37.
  • projections formed by partial ring segments 37 are provided in a regular position arrangement on the surface 34, the intermediate spaces 41 of which form the paths for the flow through. It is understood that spacers of other shape and positional arrangement could be provided, as well as a single, (not shown) one-piece projection, wherein in the latter case openings or recesses in the projection could form the fluid path for the flow through the valve assembly.
  • valve body 29 may be designed so that it has on the surface 34 delimited edge 39 from the plane of the surface 34 slightly projecting edge 51.
  • the use of a valve body 29 with such a peripheral edge 51 allows the production of the pressure accumulator according to a particularly advantageous manufacturing method.
  • Fig. 6 is merely indicated schematically, in the preparation of the membrane 3 with molded therein valve body 29 proceeded so that the provided with the edge 51 valve body 29 is inserted into an injection mold, from the in Fig.
  • a molding 53 is indicated schematically, and then the membrane 3 is formed by injecting an elastomer, wherein the valve body 29 is formed, then the edge 51 forms by abutment against the wall of the molding 53 a sealing edge, which effectively prevents elastomer uncontrolled passes under the surface 34 of the valve body 29.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Vehicle Body Suspensions (AREA)

Description

Die Erfindung bezieht sich auf einen hydropneumatischen Druckspeicher mit den Merkmalen im Oberbegriff von Anspruch 1.The invention relates to a hydropneumatic pressure accumulator having the features in the preamble of claim 1.

Bei derartigen Membranspeichern ist der gasseitige Arbeitsraum meist mit einem unter einem hohen Vorspanndruck stehenden Arbeitsgas, insbesondere N2, vorgefüllt, wobei es sich um Vorspanndrücke in der Größenordnung von 100 bar handeln kann. Wenn im Betrieb an der einen Ölanschluss aufweisenden Gehäuseöffnung ein Hydrauliksystem angeschlossen ist und der Druck des Hydrauliköls des angeschlossenen Hydrosystems im Bereich des vorgesehenen Betriebsdruckes liegt, ist die flexible Membran im Bereich des den Öldruck führenden Fluidraumes so weit von der Innenwand des Speichergehäuses abgehoben, dass die Volumenverringerung, die sich durch das Abwölben der Membran von der fluidseitigen Innenwand des Speichergehäuses ergibt, den ursprünglichen Vorfülldruck po auf einen Druck p1 (momentaner Arbeitsdruck) anhebt, wobei Druckgleichgewicht an der Membran herrscht.In such diaphragm accumulators, the gas-side working space is usually prefilled with a high biasing pressure working gas, in particular N 2 , which may be biasing pressures of the order of 100 bar. If a hydraulic system is connected to the housing opening having an oil connection in operation and the pressure of the hydraulic oil of the connected hydraulic system is in the range of the intended operating pressure, the flexible membrane in the region of the fluid pressure leading fluid chamber is so far from the inner wall of the storage housing that the Volume reduction, which results from the bulging of the membrane from the fluid-side inner wall of the storage housing, the original pre-charge po to a pressure p 1 (current working pressure) raises, wherein pressure equilibrium prevails on the membrane.

Wenn an der Gehäuseöffnung kein oder nur geringer Fluiddruck herrscht, wenn beispielsweise noch kein Hydrosystem am Ölanschluss angeschlossen ist oder das Hydrosystem drucklos ist, dann liegt die Membran unter der Wirkung des Vorfülldruckes po an der Innenwand des Fluidraumes an, wobei der an die Gehäuseöffnung heran bewegte Flächenabschnitt mit dem daran befindlichen Ventilkörper der Ventilanordnung die Gehäuseöffnung verschließt.If no or only low fluid pressure prevails at the housing opening, if, for example, no hydrosystem is still connected to the oil connection or the hydrosystem is depressurized, then the membrane is under the effect of the pre-charge pressure po on the inner wall of the fluid space, wherein the surface portion moved toward the housing opening closes the housing opening with the valve body of the valve assembly located thereon.

Der Verschluss der Gehäuseöffnung ist insofern vorteilhaft, als der Membranspeicher vor Einbau in eine betreffende Hydroanlage und nachdem im Gasraum der gewünschte Vollfülldruck po aufgebaut worden ist, keine offene Gehäuseöffnung aufweist, weil die den Ölanschluss bildende Öffnung durch die Membran geschlossen ist. Der vorgefüllte Speicher kann daher gehandhabt, gelagert und transportiert werden, ohne dass zu befürchten ist, dass durch die den Ölanschluss bildende Gehäuseöffnung Verunreinigungen oder Fremdkörper eintreten könnten.The closure of the housing opening is advantageous in that the diaphragm accumulator has no open housing opening prior to installation in a particular hydraulic system and after the desired full filling pressure has been established in the gas space, because the opening forming the oil connection is closed by the membrane. The prefilled storage can therefore be handled, stored and transported, without any fear that impurities or foreign bodies could enter through the housing opening forming the oil connection.

Andererseits können sich während des Betriebes des in eine Hydroanlage eingebauten Speichers Probleme aufgrund des Vorhandenseins des durch die Ventilanordnung bewirkten Verschlusses der Gehäuseöffnung ergeben. Wenn es im Betrieb beispielsweise zu einem verhältnismäßig plötzlichen Abfall des Druckes am Ölanschluss kommen sollte und dies aufgrund der Flexibilität der Membran zu einem schnellen Schließvorgang führt, weil sich der Ventilkörper schlagartig an die Gehäuseöffnung bewegt, dann kann es zur Bildung so genannter "Öltaschen" kommen, wobei in von der Gehäuseöffnung entfernteren Wandbereichen ein Restvolumen des Hydrauliköls im Fluidraum zurückbleibt. Mit anderen Worten gesagt, ist in diesem Fall die Membran im Bereich von Öltaschen an der Innenwand des Speichergehäuses nicht vollflächig anliegend, sondern dem Volumen der Öltaschen entsprechend leicht abgehoben, wodurch sich eine entsprechende Volumenverkleinerung des Gasraumes gegenüber dessen durch die Geometrie des Speichergehäuses bestimmten Größtvolumen ergibt. Infolgedessen entspricht der Gasvorspanndruck im Gasraum, obwohl kein Fluiddruck am Ölanschluss ansteht, nicht dem vorgegebenen Wert po, sondern einem höheren Gasvorspanndruck. Dadurch steigt auch der Ansprechdruck des Speichers an, d. h. der Öffnungsdruck p1 steigt an. Somit kann es bei mehrmaligem schnellen Entleeren und Füllen zu einem "Aufpumpen" des Speichers mit ansteigendem p1 kommen. Wenn nun Prüfvorgänge auf der Gasseite vorgenommen werden, wie sie durch die Systemsteuerungen bei Hydroanlagen vorgesehen sind, so wird bei einer Kontrolle, ob der Vorfülldruck dem Wert po entspricht, irrtümlicher Weise ein zu hoher Gasvorspanndruck erkannt, der vom System gegebenenfalls irrtümlicher Weise korrigiert wird.On the other hand, problems may arise during the operation of the built-in hydraulic system memory due to the presence of the caused by the valve assembly closure of the housing opening. If, for example, a relatively sudden decrease in the pressure at the oil connection should occur during operation and this leads to a rapid closing process because the valve body abruptly moves toward the housing opening, so-called "oil pockets" may form , wherein remaining in the housing opening more remote wall regions, a residual volume of the hydraulic oil in the fluid space. In other words, in this case, the membrane in the region of oil pockets on the inner wall of the storage housing is not the entire surface, but the volume of the oil pockets correspondingly slightly lifted, resulting in a corresponding reduction in volume of the gas space compared to its determined by the geometry of the storage housing largest volume , As a result, although no fluid pressure is applied to the oil port, the gas bias pressure in the gas space does not correspond to the predetermined value po but to a higher gas bias pressure. As a result, the set pressure of the Memory, ie, the opening pressure p 1 increases. Thus, with repeated rapid emptying and filling, it can lead to a "pumping up" of the memory with increasing p 1 . Now, if tests are carried out on the gas side, as provided by the system controls in hydraulic systems, so when checking whether the pre-charge corresponds to the value po, erroneously detects a too high gas biasing pressure, which is optionally corrected by the system erroneously.

Um hier Abhilfe zu schaffen, d. h. die Gefahr zu vermeiden, dass trotz des Vorhandenseins einer an der ölseitigen Gehäuseöffnung befindlichen Ventilanordnung es bei fehlendem Fluiddruck zu unterschiedlichen, bei Prüfvorgängen möglicher Weise irreführenden Gasvorspanndrücken im Gasraum kommen kann, ist es ausweislich dem Dokument DE 20 2007 008 175 bereits bekannt, bei einem Druckspeicher der eingangs genannten Art die Ventilanordnung so auszubilden, dass eine bei der Schließstellung einen begrenzten Durchstrom durch die Gehäuseöffnung ermöglichende Bypassanordnung gebildet ist. Bei der bekannten Lösung ist die Bypassanordnung dadurch gebildet, dass an dem als Ventilsitz für den Ventilkörper dienenden Rand der Gehäuseöffnung des Speichergehäuses Nuten vorgesehen sind, die in den die Ventilsitzfläche bildenden Rand der Gehäuseöffnung des Speichergehäuses eingearbeitet sind. Die Ausbildung der Nuten bedingt einen erhöhten Fertigungsaufwand bei der Herstellung des Gehäuses. Zudem besteht die Gefahr, dass bei entsprechender Nachgiebigkeit des für den Ventilkörper vorgesehenen Werkstoffes Material des Ventilkörpers in die Nuten eingedrückt wird, was einen dichten Verschluss der Ventilanordnung zur Folge hätte und die Bypassanordnung unwirksam machen würde.To remedy this situation, ie to avoid the risk that in spite of the presence of a located on the oil-side housing opening valve assembly it can lead to different, in test procedures possible misleading Gasvorspanndrücken in the gas space in the absence of fluid pressure, it is evidently the document DE 20 2007 008 175 already known, the valve assembly in an accumulator of the type mentioned in such a way that at the closed position a limited flow through the housing opening enabling bypass arrangement is formed. In the known solution, the bypass arrangement is formed by the fact that at the serving as a valve seat for the valve body edge of the housing opening of the storage housing grooves are provided which are incorporated in the valve seat surface forming edge of the housing opening of the storage enclosure. The formation of the grooves requires an increased production cost in the manufacture of the housing. In addition, there is a risk that material of the valve body is pressed into the grooves with a corresponding yielding of the material provided for the valve body, which would result in a tight closure of the valve arrangement and would make the bypass arrangement ineffective.

Neben den genannten Membranspeichern sind im Stand der Technik auch hydropneumatische Druckspeicher in Form von Balgspeichern bekannt. Bei den genannten Balgspeichern erstreckt sich innerhalb des Speichergehäuses ein in Längsrichtung gesehen ausziehbarer Faltenbalg, der an seinem einen freien Ende regelmäßig mit der Innenseite des Speichergehäuses verbunden ist und an seinem anderen freien Ende in der Regel ein plattenartiges Ventilschließglied aufweist, mit dem der Ölfluidanschluß des Speichergehäuses verschlossen, aber auch freigegeben werden kann. Im Inneren des Faltenbalges ist dann vergleichbar der Membranspeicherlösung regelmäßig ein Arbeitsgas, insbesondere in Form von Stickstoffgas, angeordnet. Ein Vertreter der dahingehenden Balgspeicherlösungen ist in der EP 1 052 412 A2 aufgezeigt, wobei an der Unterseite des plattenförmigen Ventilschließgliedes zur Fluideinlaßöffnung des Speichergehäuses vorstehend ein ringförmiger Elastomer-Dichtrand vorsteht, der der besseren Anschlagdämpfung wegen einzelne ringsegmentartige Vorsprünge aufweist, die jedoch in ihrer Gesamtausdehnung in der die Fluideinlaßöffnung absperrenden Schließstellung diese allseitig und vollständig umfassen. Die eingangs erwähnte vorteilhafte "Bypassanordnung" ist mit der dahingehend bekannten Faltenbalgspeicherlösung nicht erreicht.In addition to the diaphragm accumulators mentioned, hydropneumatic pressure accumulators in the form of bellows accumulators are also known in the prior art. In the bellows stores mentioned extends within the storage enclosure a seen in the longitudinal direction extendable bellows, which is connected at its one free end regularly with the inside of the storage enclosure and at its other free end usually a plate-like valve closure member, with which the oil fluid port of the storage enclosure closed, but can also be released. In the interior of the bellows is then comparable to the membrane storage solution regularly a working gas, in particular in the form of nitrogen gas, arranged. A representative of the bellows storage solutions is in the EP 1 052 412 A2 shown, wherein protruding on the underside of the plate-shaped valve closing member to the fluid inlet opening of the storage housing, an annular elastomer sealing edge, which has the better stop damping because of individual ring-segment-like projections, but in their total extent in the fluid inlet opening shut-off closed this completely and completely. The initially mentioned advantageous "bypass arrangement" is not achieved with the known bellows storage solution.

Ein gattungsgemäßer hydropneumatischer Druckspeicher ist in der GB 604 731 A aufgezeigt. Die bekannte Lösung weist eine Ventilanordnung auf, die einen an einem Flächenabschnitt der Membran angreifenden Ventilkörper besitzt, der bei Annäherung an einen an der Gehäuseöffnung befindlichen Ventilsitz, die Ventilanordnung in die Schließstellung überführt, mit einer bei dieser Schließstellung einen begrenzten Durchstrom durch die Gehäuseöffnung ermöglichenden Bypassanordnung, die an ihrer dem Ventilsitz zugewandten Fläche einen Abstandhalter aufweist, der gegenüber dem Ventilsitz den Durchstrom ermöglicht. Bei der bekannten Lösung ist der Ventilkörper in Form zweier scheibenförmiger Platten ausgebildet, die zwischen sich einen Klemmsitz für die Aufnahme des Membran-Flächenabschnittes aufweisen und die gegeneinander mittels einer Festlegeschraube klemmbar sind. Diese bekannte Klemmsitzlösung für die Membran baut kompliziert auf und was das Betriebsverhalten anbelangt, lässt die bekannte Lösung noch Wünsche offen.A generic hydropneumatic pressure accumulator is in the GB 604 731 A demonstrated. The known solution has a valve arrangement which has a valve body acting on a surface portion of the diaphragm which, when approaching a valve seat located at the housing opening, transfers the valve arrangement to the closed position, with a bypass arrangement enabling a limited throughflow through the housing opening in this closed position , Which has a spacer on its surface facing the valve seat, which allows the passage relative to the valve seat. In the known solution, the valve body is designed in the form of two disk-shaped plates, which have between them a clamping fit for receiving the membrane surface portion and which are clamped against each other by means of a locking screw. This known clamping seat solution for the membrane builds complicated and as far as the operating behavior is concerned, the known solution leaves nothing to be desired.

Ausgehend von diesem Stand der Technik stellt sich die Erfindung die Aufgabe, einen Druckspeicher der betrachteten Art zur Verfügung zu stellen, der sich sowohl durch eine besonders einfache Bauweise als auch ein besonders gutes Betriebsverhalten auszeichnet.Based on this prior art, the invention has the object to provide a pressure accumulator of the type considered available, which is characterized both by a particularly simple design and a particularly good performance.

Bei einem hydropneumatischen Druckspeicher der eingangs genannten Art ist diese Aufgabe erfindungsgemäß dadurch gelöst, dass der Ventilkörper derart gestaltet ist, dass er an einem die dem Ventilsitz zugewandte Fläche begrenzenden Rand ein aus der Ebene dieser Fläche geringfügig vorspringende Kante aufweist.In a hydropneumatic pressure accumulator of the type mentioned above, this object is achieved in that the valve body is designed such that it has at one of the valve seat facing surface bounding edge of the plane of this surface slightly projecting edge.

Dadurch ist, ohne dass eine Modifizierung des Speichergehäuses erforderlich wäre, lediglich durch die Formgebung des Ventilkörpers eine das sichere Abfließen des gesamten Ölinhaltes des Ölraumes sicherstellende Bypassanordnung realisiert. Eine derartige Bauweise ermöglicht eine besonders rationelle Herstellung des Druckspeichers.As a result, without a modification of the storage housing would be required, realized only by the shape of the valve body a secure drainage of the entire oil content of the oil space ensuring bypass arrangement. Such a construction allows a particularly efficient production of the pressure accumulator.

Bei vorteilhaften Ausführungsbeispielen können an der dem Ventilsitz zugewandten Fläche des Ventilkörpers zumindest zwei Vorsprünge vorgesehen sein, zwischen denen sich ein den Durchstrom ermöglichender Zwischenraum befindet.In advantageous embodiments, at least two projections may be provided on the surface of the valve body facing the valve seat, between which there is a passage enabling the intermediate space.

In besonders vorteilhafter Weise kann die Anordnung hierbei so getroffen sein, dass mehrere Vorsprünge an der Fläche des Ventilkörpers in regelmäßiger Lageanordnung verteilt angeordnet sind. Dadurch bilden die Vorsprünge Abstandhalter, die den Ventilkörper kippsicher an der Ventilsitzfläche abstützen.In a particularly advantageous manner, the arrangement may in this case be such that a plurality of projections are arranged distributed on the surface of the valve body in a regular position arrangement. As a result, the projections form spacers which support the valve body in a tip-safe manner against the valve seat surface.

Bei besonders vorteilhaften Ausführungsbeispielen, bei denen die Fläche des Ventilkörpers kreisrund ist, können die Vorsprünge entlang einer konzentrischen Kreislinie angeordnet sein, die in geringem Abstand vom Umfangsrand der Fläche verläuft, wobei die Vorsprünge durch einen geschlitzten Ringkörper gebildet sein können.In particularly advantageous embodiments, in which the surface of the valve body is circular, the projections may be arranged along a concentric circle, which runs a small distance from the peripheral edge of the surface, wherein the projections may be formed by a slotted ring body.

Bei einer derartigen Gestaltung kann der geschlitzte Ringkörper vier gleiche Teilringsegmente aufweisen, zwischen denen Zwischenräume mit einer Länge vorhanden sind, die kleiner ist als die halbe Umfangslänge der Teilringsegmente. Dadurch ergibt sich ein günstiges Durchströmverhalten trotz ausreichender Standfestigkeit der als Abstandhalter dienenden Vorsprünge.In such a configuration, the slotted ring body may have four equal partial ring segments, between which there are intermediate spaces with a length which is smaller than half the circumferential length of the partial ring segments. This results in a favorable Durchströmverhalten despite sufficient stability of the spacers serving as projections.

Diese können, ausgehend von ihrer Basis an der Fläche des Ventilkörpers bis zu ihrem freien Ende hin, eine Verjüngung aufweisen.These can, starting from their base on the surface of the valve body to its free end, have a taper.

Gegenstand der Erfindung ist auch ein Verfahren zum Herstellen eines hydropneumatischen Druckspeichers nach dem Oberbegriff des Anspruches 1, wobei das Verfahren die im Patentanspruch 9 angegebenen Verfahrensschritte und Verfahrensmerkmale aufweist.The invention also provides a method for producing a hydropneumatic pressure accumulator according to the preamble of claim 1, wherein the method has the method steps and method features specified in claim 9.

Nachstehend ist die Erfindung anhand der Zeichnung im Einzelnen erläutert. Es zeigen:

Fig. 1
einen Längsschnitt durch ein Ausführungsbeispiel des erfindungsgemäßen Hydrospeichers;
Fig. 2
eine gegenüber einer praktischen Ausführungsform vergrößert dargestellte perspektivische Schrägansicht des Ventilkörpers der Ventilanordnung des Ausführungsbeispieles;
Fig. 3
eine im Maßstab von Fig. 2 gezeichnete Draufsicht des Ventilkörpers;
Fig. 4
eine Schnittdarstellung des Ventilkörpers entsprechend der Schnittlinie IV-IV von Fig. 3;
Fig. 5
eine gegenüber Fig. 1 vergrößert und abgebrochen gezeichnete Teilschnittdarstellung lediglich des Bereichs der Gehäuseöffnung und der damit zusammenwirkenden Ventilanordnung des Ausführungsbeispieles des Druckspeichers; und
Fig. 6
eine unvollständig gezeichnete Schnittdarstellung eines Formteiles einer Spritzform zur Formgebung der Membran zur Herstellung des Druckspeichers unter Benutzung des erfindungsgemäßen Verfahrens.
The invention is explained in detail below with reference to the drawing. Show it:
Fig. 1
a longitudinal section through an embodiment of the hydraulic accumulator according to the invention;
Fig. 2
a relation to a practical embodiment enlarged illustrated perspective oblique view of the valve body of the valve assembly of the embodiment;
Fig. 3
a scale of Fig. 2 drawn plan view of the valve body;
Fig. 4
a sectional view of the valve body according to the section line IV-IV of Fig. 3 ;
Fig. 5
one opposite Fig. 1 enlarged and broken drawn partial sectional view of only the area of the housing opening and the cooperating valve arrangement of the embodiment of the pressure accumulator; and
Fig. 6
an incompletely drawn sectional view of a molded part of an injection mold for shaping the membrane for the production of the pressure accumulator using the method according to the invention.

Bei dem in der Zeichnung dargestellten Hydrospeicher handelt es sich um einen sogenannten Membranspeicher mit einer in einem als Ganzes mit 1 bezeichneten Speichergehäuse angeordneten Trennwand in Form einer elastischen Membran 3. Die Membran 3 trennt das Gehäuse 1 in seinem Inneren in einen Fluidraum 5 und einen Gasraum 7. Das Gehäuse 1 besteht, in Blickrichtung auf Fig. 1 gesehen, aus einer oberen Gehäuseschale 9 und einer unteren Gehäuseschale 11, die jeweils eine kreisrunde Schalenform mit näherungsweise halbkugelförmig gewölbter Innenwand aufweisen. An dem dem Fluidraum 5 entgegengesetzten Ende des Speichergehäuses 1, also dem dem Gasraum 7 zugehörigen Ende, befindet sich ein Gasanschluss 13, über den der Gasraum 7 mit einem Arbeitsgas, insbesondere N2-Gas, vorfüllbar ist. Das dem Fluidraum 5 zugeordnete Ende weist eine in den Fluidraum 5 mündende Gehäuseöffnung 15 auf, an der ein Ölanschluss 17 außenseitig angebracht ist, über den der Speicher an einem (nicht dargestellten) Hydrauliksystem anschließbar ist.In the hydraulic accumulator shown in the drawing is a so-called diaphragm accumulator with a arranged in a designated as a whole by 1 storage enclosure partition in the form of an elastic membrane 3. The membrane 3 separates the housing 1 in its interior into a fluid space 5 and a gas space 7. The housing 1 is, in the viewing direction Fig. 1 seen from an upper housing shell 9 and a lower housing shell 11, each having a circular shell shape with approximately hemispherical curved inner wall. At the end of the storage housing 1 opposite the fluid space 5, ie the end associated with the gas space 7, there is a gas connection 13, via which the gas space 7 can be pre-filled with a working gas, in particular N 2 gas. The end associated with the fluid space 5 has a housing opening 15 opening into the fluid space 5, to which an oil connection 17 is attached on the outside, via which the reservoir can be connected to a hydraulic system (not shown).

Obere Gehäuseschale 9 und andere Gehäuseschale 11, die längs einer Nahtstelle 19 aneinander stoßen, sind mittels eines Elektronenstrahlschweißverfahrens miteinander verbunden. Im Bereich der Nahtstelle 19 ist an der Innenwand ein Befestigungsring 21 festgelegt, der den Träger für die Membran 3 bildet, die mit einem verdickten, umfänglichen Randwulst 23 in einer Ringnut 25 des Befestigungsringes 21 sitzt. Dieser ist über ein Dichtelement 27 an der Innenwand des Gehäuses 1 abgedichtet.Upper housing shell 9 and other housing shell 11, which abut each other along a seam 19 are connected to each other by means of an electron beam welding process. In the region of the interface 19, a fastening ring 21 is fixed to the inner wall, which is the carrier for the Membrane 3 forms, which sits with a thickened, peripheral edge bead 23 in an annular groove 25 of the fastening ring 21. This is sealed by a sealing element 27 on the inner wall of the housing 1.

Die Fig. 1 zeigt den Membranspeicher in einem Betriebszustand, bei dem sich die Membran 3 in einer Zwischenstellung befindet, bei der an beiden Seiten in die Membran 3 Druckgleichgewicht herrscht, weil das am Ölanschluss 17 angeschlossene, jedoch nicht dargestellte Hydrauliksystem im Fluidraum 5 einen Fluiddruck erzeugt, der dem im Gasraum 7 herrschenden Druck entspricht. Bei Zuständen, bei denen im Ölraum 5 nur ein geringer Öldruck herrscht oder dieser fehlt, bewegt sich die Membran 3, bei Blickrichtung entsprechend der Fig. 1, nach unten und legt sich an die Innenseite der unteren Gehäuseschale 11 an, wobei die Membran 3 mit einem an ihrem zentralen Flächenbereich befindlichen Ventilkörper 29 einen Ventilsitz 33 am Rand 31 der Gehäuseöffnung 15 überdeckt. Bei diesem Betriebszustand, der dem kleinsten Volumen des Ölraumes 5 und dem größten Volumen des Fluidraumes 7 entspricht, herrscht im Fluidraum 7 der Vorfülldruck po. Dessen Größe ist einsatzspezifisch gewählt und stellt den Vorfülldruck dar, der als Voreinstellung des Hydrospeichers, während der Fluidraum 5 drucklos ist, im Gasraum 7 aufgebaut wird. Bei laufendem Betrieb wird in zweckmäßiger Weise eine Prüfung dahingehend durchgeführt, ob der Vorfülldruck po unverändert ist und dementsprechend der Speicher ein unverändertes Betriebsverhalten besitzt.The Fig. 1 shows the diaphragm accumulator in an operating condition in which the diaphragm 3 is in an intermediate position in which there is pressure equilibrium on both sides in the diaphragm 3, because the hydraulic system connected to the oil connection 17 but not shown generates a fluid pressure in the fluid space 5, which is the in the gas space 7 prevailing pressure corresponds. In states in which there is only a slight oil pressure in the oil chamber 5 or this is missing, the membrane 3 moves, in viewing direction according to the Fig. 1 , downwards and abuts against the inside of the lower housing shell 11, the membrane 3 covering a valve seat 33 at the edge 31 of the housing opening 15 with a valve body 29 located at its central area. In this operating state, which corresponds to the smallest volume of the oil chamber 5 and the largest volume of the fluid chamber 7 prevails in the fluid space 7 of the pre-charge po. Its size is selected application-specific and represents the Vorfülldruck, as the default of the hydraulic accumulator, while the fluid chamber 5 without pressure is, is built up in the gas space 7. During operation, a check is appropriately carried out to determine whether the pre-charge po is unchanged and accordingly the memory has an unchanged operating behavior.

Wenn es im Betrieb zu einem sehr raschen und schlagartigen Abfall des Druckes im Fluidraum 5 kommt, bewegt sich die Membran 3 schlagartig in Richtung auf die Gehäuseöffnung 15, wobei der Ventilkörper 29 am Ventilsitz 33 anliegt. Somit bildet der Ventilkörper 29 Bestandteil einer Ventilanordnung.When it comes to a very rapid and sudden drop in pressure in the fluid space 5 during operation, the membrane 3 moves abruptly in the direction of the housing opening 15, wherein the valve body 29 rests against the valve seat 33. Thus, the valve body 29 forms part of a valve assembly.

Um die Gefahr zu vermeiden, dass bei entsprechend rascher oder schlagartiger Bewegung der Membran 3 die Gehäuseöffnung 15 geschlossen ist, bevor das gesamte Ölvolumen 5 ausgetreten ist, dass also keine Öltaschen durch verbleibende Restvolumina im Fluidraum 5 gebildet werden, ist der Ventilkörper 29, wie am besten den Fig. 2 bis 5 entnehmbar ist, so gestaltet, dass eine Bypassanordnung gebildet ist, die bei der Schließstellung der Ventilanordnung einen begrenzten Durchstrom durch die Gehäuseöffnung 15 ermöglicht, so dass jedes Restvolumen des Öls aus dem Fluidraum 5 abfließen kann. Um die Umgehung der Ventilanordnung zu ermöglichen, sind an der dem Ventilsitz 33 zugewandten Fläche 34 speziell ausgebildete, aus der Ebene der kreisrunden Fläche 34 vorstehende Vorsprünge vorgesehen, deren spezielle Formgebung am deutlichsten aus Fig. 2 und 3 entnehmbar ist. Diese Vorsprünge, die gegenüber dem Ventilsitz 33 Abstandhalter bilden, verhindern eine unmittelbare Anlage der Fläche 34 des Ventilkörpers 29 am Ventilsitz 33. Wie die Fig. 2 und 3 am deutlichsten zeigen, sind die Vorsprünge durch Teilringsegmente 37 eines geschlitzten Ringkörpers gebildet, der sich entlang einer konzentrischen Kreislinie erstreckt, die dem Rand 39 des kreisrunden Ventilkörpers 29 benachbart ist. Zwischen den Teilringsegmenten 37, die jeweils die gleiche Länge besitzen, befinden sich jeweils Zwischenräume 41, die ebenfalls die gleiche Länge besitzen, so dass die Vorsprünge in regelmäßiger Lageanordnung an der Fläche 34 angeordnet sind. Bei in der Schließstellung befindlicher Ventilanordnung, wie sie in der Fig. 5 dargestellt ist, bilden die Zwischenräume 41 jeweils Fluidwege für einen begrenzten Durchstrom zwischen Fluidraum 5 und Gehäuseöffnung 15.To avoid the risk that in accordance with rapid or sudden movement of the diaphragm 3, the housing opening 15 is closed before the entire volume of oil has leaked 5, so that no oil pockets are formed by remaining residual volumes in the fluid space 5, the valve body 29, as on best that Fig. 2 to 5 can be removed, designed so that a bypass arrangement is formed, which allows a limited flow through the housing opening 15 in the closed position of the valve assembly, so that any residual volume of the oil can flow out of the fluid chamber 5. In order to enable the valve arrangement to be bypassed, specially formed projections projecting from the plane of the circular surface 34 are provided on the surface 34 facing the valve seat 33, their special shape being the clearest FIGS. 2 and 3 is removable. These projections, which form spacers relative to the valve seat 33, prevent direct contact of the surface 34 of the valve body 29 on the valve seat 33 FIGS. 2 and 3 Most clearly, the projections are formed by partial ring segments 37 of a slotted ring body extending along a concentric circle adjacent the rim 39 of the circular valve body 29. Between the partial ring segments 37, which each have the same length, there are in each case intermediate spaces 41, which likewise have the same length, so that the projections are arranged in a regular position arrangement on the surface 34. When in the closed position located valve assembly, as shown in the Fig. 5 1, the intermediate spaces 41 each form fluid paths for a limited throughflow between the fluid space 5 and the housing opening 15.

Wie den Fig. 2 bis 4 ebenfalls entnehmbar ist, haben die Teilringsegmente 37, ausgehend von ihrer Basis an der Fläche 34 zum freien Ende hin, eine verjüngte Form, die dadurch gebildet ist, dass sie an ihrer radial außenliegenden Seite durch eine koaxiale Zylinderfläche 43 (siehe Fig. 2 und 4) und an der Innenseite durch eine Kegelfläche 45 begrenzt sind, die durch eine schmale, zur Fläche 34 des Ventilkörpers 29 parallele Endfläche 47 verbunden sind. Bei dem in der Zeichnung gezeigten Ausführungsbeispiel ist die Länge der Zwischenräume 41 jeweils geringer als die halbe Umfängslänge der Teilringsegmente 37.Like that Fig. 2 to 4 can also be removed, have the partial ring segments 37, starting from its base on the surface 34 towards the free end, a tapered shape, which is formed by that on its radially outer side by a coaxial cylindrical surface 43 (see Fig. 2 and 4 ) and bounded on the inside by a conical surface 45, which by a narrow, parallel to the surface 34 of the valve body 29 end surface 47 are connected. In the embodiment shown in the drawing, the length of the intermediate spaces 41 is less than half the circumferential length of the partial ring segments 37.

Beim gezeigten Ausführungsbeispiel sind durch Teilringsegmente 37 gebildete Vorsprünge in regelmäßiger Lageanordnung an der Fläche 34 vorgesehen, deren Zwischenräume 41 die Pfade zur Durchströmung bilden. Es versteht sich, dass Abstandhalter anderer Formgebung und Lageanordnung vorgesehen sein könnten, ebenso wie ein einzelner, (nicht dargestellter) einteiliger Vorsprung, wobei in letztgenanntem Falle Durchbrüche oder Ausnehmungen im Vorsprung den Fluidweg für das Durchströmen der Ventilanordnung bilden könnten.In the embodiment shown, projections formed by partial ring segments 37 are provided in a regular position arrangement on the surface 34, the intermediate spaces 41 of which form the paths for the flow through. It is understood that spacers of other shape and positional arrangement could be provided, as well as a single, (not shown) one-piece projection, wherein in the latter case openings or recesses in the projection could form the fluid path for the flow through the valve assembly.

Wie Fig. 1 und deutlicher Fig. 5 zu entnehmen ist, kann der Ventilkörper 29 so gestaltet sein, dass er an dem die Fläche 34 begrenzten Rand 39 eine aus der Ebene der Fläche 34 geringfügig vorspringende Kante 51 aufweist. Die Benutzung eines Ventilkörpers 29 mit einer derartigen, randseitigen Kante 51 ermöglicht die Herstellung des Druckspeichers nach einem besonders vorteilhaften Herstellverfahren. Wird, wie in Fig. 6 lediglich schematisiert angedeutet ist, bei der Herstellung der Membran 3 mit darin eingeformten Ventilkörper 29 so vorgegangen, dass der mit der Kante 51 versehene Ventilkörper 29 in eine Spritzform eingelegt wird, von der in Fig. 6 lediglich ein Formteil 53 schematisiert angedeutet ist, und wird sodann die Membran 3 durch Einspritzen eines Elastomers gebildet, wobei der Ventilkörper 29 eingeformt wird, dann bildet die Kante 51 durch Anlage an der Wand des Formteiles 53 eine Abdichtkante, die wirksam verhindert, dass Elastomer unkontrolliert unter die Fläche 34 des Ventilkörpers 29 gelangt.As Fig. 1 and more clearly Fig. 5 it can be seen, the valve body 29 may be designed so that it has on the surface 34 delimited edge 39 from the plane of the surface 34 slightly projecting edge 51. The use of a valve body 29 with such a peripheral edge 51 allows the production of the pressure accumulator according to a particularly advantageous manufacturing method. Will, as in Fig. 6 is merely indicated schematically, in the preparation of the membrane 3 with molded therein valve body 29 proceeded so that the provided with the edge 51 valve body 29 is inserted into an injection mold, from the in Fig. 6 only a molding 53 is indicated schematically, and then the membrane 3 is formed by injecting an elastomer, wherein the valve body 29 is formed, then the edge 51 forms by abutment against the wall of the molding 53 a sealing edge, which effectively prevents elastomer uncontrolled passes under the surface 34 of the valve body 29.

Claims (9)

  1. A hydropneumatic pressure accumulator comprising a movable separating element arranged in an accumulator housing (1), which separating element separates a first working chamber, preferably a gas chamber (7), from a fluid chamber (5) as a second working chamber and is formed by means of a membrane (3) made of a flexible material, in particular an elastomer, there being located on the accumulator housing (1) a housing opening (15) that forms an access to the fluid chamber (5), the passage of which housing opening can be controlled by means of a valve arrangement that can be transferred into a release position and a closed position and has a valve body (29) located on a surface section of the membrane (3), which valve body transfers the valve arrangement into the closed position when a valve seat (33) located on the housing opening (15) is approached, the valve arrangement having a bypass arrangement that enables a limited flow through the housing opening in the closed position, the valve body (29) having at least one projection (37) on its surface (34) facing the valve seat (33) in order to form the bypass arrangement, which projection forms a spacer that enables the flow-through with respect to the valve seat (33), characterised in that the valve body (29) is configured such that it has a border (51) projecting slightly out of the plane of this surface (34) at an edge (39) adjacent to the surface (34) facing the valve seat (33).
  2. The hydropneumatic pressure accumulator according to Claim 1, characterised in that at least two projections (37) are provided on the surface (34) of the valve body (29) facing the valve seat (33), between which projections there is a space (41) that enables the flow-through.
  3. The hydropneumatic pressure accumulator according to any of the preceding claims, characterised in that a number of projections (37) are arranged distributed in a regular positional arrangement on the surface (34) of the valve body (29).
  4. The hydropneumatic pressure accumulator according to any of the preceding claims, characterised in that the surface (34) of the valve body (29) is circular, and that the projections (37) are arranged along a concentric circular line which runs a small distance away from the circumferential edge of the surface (34)
  5. The hydropneumatic pressure accumulator according to any of the preceding claims, characterised in that the projections are formed by a slotted annular body (37).
  6. The hydropneumatic pressure accumulator according to any of the preceding claims, characterised in that the slotted annular body has four identical part-ring segments (37) between which there are spaces (41) with a length that is smaller than half the circumference length of the part-ring segments (37).
  7. The hydropneumatic pressure accumulator according to any of the preceding claims, characterised in that respective projections (37) have a taper passing from their base on the surface (34) of the valve body (29) to their free end (47).
  8. The hydropneumatic pressure accumulator according to any of the preceding claims, characterised in that the projections formed by a slotted annular body (37) are delimited with respect to the taper on their one side by a conical surface (45) passing from the surface (34) of the valve body (29) and on the other side by a cylindrical surface (43) which are connected by a narrow end surface (47) parallel to the surface (34) of the valve body (29).
  9. A method of producing a hydropneumatic pressure accumulator according to the preamble to Claim 1, comprising the steps of:
    a) providing a valve body (29) with at least one projection (37) located on the surface (34) facing the valve seat (33);
    b) inserting the valve body (29) into an injection die (53) in order to form a flexible membrane (3) forming a moveable separating element, and
    c) injecting an elastomer forming the membrane (3) in such a way that the valve body (29) is incorporated into the elastomer by releasing the surface (34) facing the valve seat,
    characterised in that a valve body (29) is used that has a projecting border (51) on the edge delimiting the surface (34), which border forms a seal co-operating with the wall of the injection die (53).
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DE102014010006A1 (en) 2014-07-05 2016-01-07 Hydac Technology Gmbh Hydropneumatic pressure accumulator
DE102015012357A1 (en) 2015-09-18 2017-03-23 Hydac Technology Gmbh hydraulic accumulator
KR101793673B1 (en) * 2016-06-22 2017-11-03 주식회사 대영특수고무 Accumulator diaphragm
KR101824717B1 (en) * 2016-10-19 2018-02-02 (주)에버다임 Accumulator of the hydraulic breaker
KR102133256B1 (en) * 2019-05-10 2020-07-14 주식회사 구영테크 0.1 liter type accumulator
DE102022129348A1 (en) 2022-11-07 2024-05-08 Hydac Technology Gmbh Proceedings

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JP5698247B2 (en) 2015-04-08
WO2011044968A3 (en) 2013-04-11
WO2011044968A2 (en) 2011-04-21
EP2488762A2 (en) 2012-08-22
DE102009049547B3 (en) 2011-02-17

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