EP2430318B1 - Hydraulic accumulator - Google Patents

Hydraulic accumulator Download PDF

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Publication number
EP2430318B1
EP2430318B1 EP10715709.1A EP10715709A EP2430318B1 EP 2430318 B1 EP2430318 B1 EP 2430318B1 EP 10715709 A EP10715709 A EP 10715709A EP 2430318 B1 EP2430318 B1 EP 2430318B1
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EP
European Patent Office
Prior art keywords
housing shell
hydraulic accumulator
housing
membrane
edge
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EP10715709.1A
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German (de)
French (fr)
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EP2430318A1 (en
Inventor
Norbert Weber
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Hydac Technology GmbH
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Hydac Technology GmbH
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    • 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
    • F15B1/106—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means characterised by the way housing components are assembled
    • 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
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • 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
    • F15B2201/405—Housings
    • F15B2201/4056—Housings characterised by the attachment of housing components

Definitions

  • the invention relates to hydraulic accumulators with the features in the preamble of claim 1 or 11.
  • Hydraulic accumulators in hydraulic systems are used, among other things, to take up certain volumes of pressurized liquids and to give them back to the system when required.
  • Hydraulic systems with hydropneumatic accumulators with a separating element designed as a membrane are particularly widespread.
  • the membrane separates a liquid space as a working space from a gas space as a further working space.
  • the preferred working gas is nitrogen, with the membrane decoupling the gas and liquid space.
  • the fluid space is also connected to a hydraulic circuit of the system, so that when the pressure rises, the hydraulic accumulator takes up pressure medium and the gas is compressed in the process. When the pressure drops, the previously compressed gas expands again, displacing the pressure medium (hydraulic fluid) back into the hydraulic circuit.
  • a hydraulic accumulator is formed from two housing shells, which abut with their free opening edges and each one Limit partial volume or a working space of the hydraulic accumulator with the interposition of the membrane.
  • the end-to-end housing shells are usually welded to one another at the relevant joint by means of various welding processes, and depending on the welding process, it cannot be ruled out that hot metal beads or metal particles inside the hydraulic accumulator lead to damage to the membrane during the welding process. This can have a negative impact on the stability of the membrane.
  • the pressure accumulator consists of two spherical shells that are pushed into one another at the edges.
  • the outer spherical shell engages with its edge over the edge of the inner spherical shell and the edges are designed in such a way that, in the assembled state of the spherical shells, their metallic surfaces lie tightly on one another.
  • the inner spherical shell on its outer circumference and the outer spherical shell on its inner circumference each have a groove into which a snap ring is inserted.
  • a membrane is also arranged between the edges.
  • the invention has the object of specifying a hydraulic accumulator of the type under consideration, the membrane of which cannot be affected during its manufacture.
  • an essential feature of the invention is that an opening edge of the housing shell lying radially on the outside at the point of overlap is applied by reshaping to the circumference of the radially inside housing shell with the formation of a form fit.
  • the form-fit connection is preferably designed in a sealing manner and seals the interior of the memory from the environment. Furthermore, the form fit enables tensile stresses to be transmitted from the first to the second housing shell of the hydraulic accumulator. This prevents the membrane inside the hydraulic accumulator from being impaired in any way during assembly.
  • a separating element formed as a membrane made of elastomeric material comes into contact in a circumferential groove on the inside of the radially outer first housing shell and is held by an anchoring part which consists of a clamping ring that is essentially U-shaped in cross section.
  • an edge bead of the membrane is held between a hollow profile with a C-shaped cross section and drawn radially inward, which is an integral part of the upper housing shell.
  • At least one housing shell is placed against an axial stop in the interior of the accumulator housing, this being held in its end position after the opening edge of the radially outer housing shell has been deformed.
  • the wall thickness of the longitudinal edge of the opening edge coming to the forming process is reduced and a transition point from the longitudinal edge to the wall forming the working space for the pressure medium thus results in a radially inwardly directed shoulder which serves as a stop.
  • the opening edge of the housing shell lying radially on the outside at the point of overlap is attached to a connection body for the working gas, forming a connecting the stepless transition of the outer surface.
  • the opening edge is preferably connected to the connection body in a sealing manner, preferably in a materially bonded manner.
  • the separating element is formed by a membrane, the peripheral edge of which is held at the overlap of the two housing shells with an anchoring part on the radially inner and / or the radially outer housing shell.
  • the anchoring part is preferably formed from a thickened edge bead along the circumference of the membrane and from a clamping ring surrounding this edge bead radially on the inside, the clamping ring pressing the edge bead into a groove-like recess in the housing shell and axially and radially in the storage housing in a defined manner.
  • the housing shells can be formed from a light metal alloy, preferably in the form of an aluminum alloy.
  • connection bodies which are provided in one piece with these housing shells and which are positioned coaxially to the longitudinal axis of the hydraulic accumulator at opposite ends of the same. You go in one compared to the wall thickness on the connection bodies reduced wall thickness of the housing shells.
  • a hydraulic accumulator 1 in the form of a so-called diaphragm accumulator is shown in a longitudinal section.
  • Related hydraulic accumulators 1 can be used, for example, within a hydraulic system to compensate for pressure fluctuations, to store energy, to absorb pulsation shocks from a pump, etc.
  • the hydraulic accumulator 1 consists of a first housing shell 2 and a second housing shell 3, which are arranged rotationally symmetrically about a longitudinal axis 4 of the hydraulic accumulator 1.
  • the housing shells 2, 3 form a storage housing 8 and are preferably made of a lightweight construction from an aluminum alloy and are obtained in one operation by means of a press forming process or the like.
  • connection body 22 with a fluid inlet is formed in one piece with the first housing shell 2.
  • a connection body 14 for working gas, such as nitrogen, is also connected in one piece to the second housing shell 3.
  • a free opening edge 6 of the second housing shell 3 overlaps with its radial inside the first housing shell 2 along its outer circumference in the area of the upper half, in particular the upper third, viewed in the axial length of the storage housing 8.
  • a separating element 7 formed as a membrane 15 made of elastomeric material comes into contact in a circumferential groove 23 on the inside of the radially outer first housing shell 2 and is held by an anchoring part 17 which, when viewed in cross section, is essentially U-shaped Clamping ring 19 consists.
  • the clamping ring 19 is supported axially on the opening edge 6 of the second housing shell 3. Looking towards the Fig. 1 seen, the upper peripheral edge of the clamping ring 19 runs parallel and in horizontal contact with the lower foot section of the housing shell 3, the overlying annular groove-shaped cavity serving to accommodate a sealant (not shown), for example in the form of an O-ring or guide sealing tape.
  • the clamping force applied over the longitudinal edge 12 of the lower housing shell 2 is then transferred to the upper housing shell 3 and consequently to the upper part of the clamping ring 19, which in this way presses the edge bead 18 of the membrane against a step-like widening of the wall thickness of the lower housing shell 2 provided downwards and so fixes the membrane arrangement in a defined manner.
  • the membrane material is provided with a thickening, which in this way forms a valve body with which the fluid connection point can be closed as soon as the separating membrane device is brought into its lower closed position, not shown, under the influence of the working gas. So that the edge bead 18 is also supported downwards, the diameter of the clamping ring 19 in the lower area of the edge bead is again widened and in this respect also forms a support for the membrane-like separating element 7 towards the interior of the storage housing 8.
  • the beaded edge 18 is held between a hollow profile which is C-shaped in cross section and is drawn radially inward and which is an integral part of the upper housing shell 3. That is the cross section of the opening edge 6 of the second
  • the hollow profile defining the housing shell 3 is formed from a leg 20 extending radially inward and a leg 21 extending radially outward. If in the embodiment according to the Fig. 2 the same reference numerals are used as in the Fig. 1 , the statements made in this respect also apply to the further exemplary embodiment.
  • the bead 18 in turn effects a form fit in the axial direction between the two housing shells 2, 3.
  • the first housing shell 2 has a longitudinal edge 12 of reduced wall thickness, which extends axially in the manner of an encircling band along the circumferential side of the associated contact surface of the first housing shell 3. At a transition point 13, at which the wall thickness of the first housing shell 2 tapers to the longitudinal edge 12, an axial stop 11 is again formed for the second housing shell 3 to rest against the first housing shell 2.
  • the membrane 15 separates a working space 9 for working gas from a working space 10 for pressure medium, and the longitudinal edge 12 is preferably applied to the upper peripheral part of the second housing shell 3, seen in longitudinal section, by reshaping, forming an interference fit.
  • the wall thickness of the second housing shell 3 is, in order to form a resistant counter-bearing, for this purpose approximately twice as thick as the wall thickness of the first housing shell 2 in this area. In this case, it is advantageously provided that the opening edge 5 of the first housing shell 2 is connected to one another in a sealing manner with the second housing shell 3 in a materially bonded manner.
  • the bearing of the diaphragm 15 via its edge bead takes place approximately centrally in the longitudinal direction of the storage housing 8, so that the deflection movements of the diaphragm are approximately the same in both directions.
  • the bead reinforcement arranged on the bottom of the membrane 15 protects the membrane 15 even if it hits against the connection body 14 of the upper housing shell 3 in the area of the shut-off working gas connection.
  • the hydraulic accumulator shown in lightweight construction can, as shown, be produced very inexpensively and is particularly suitable for long-term operation even under high stress.

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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)

Description

Die Erfindung betrifft Hydrospeicher mit den Merkmalen im Oberbegriff von Anspruch 1 oder 11.The invention relates to hydraulic accumulators with the features in the preamble of claim 1 or 11.

Hydrospeicher in hydraulischen Anlagen dienen unter anderem dazu, bestimmte Volumen unter Druck stehender Flüssigkeiten aufzunehmen und diese bei Bedarf an die Anlage zurück zu geben. Besonders verbreitet sind hydraulische Anlagen mit hydropneumatischen Speichern mit einem als Membran ausgebildeten Trennelement. Die Membran trennt insbesondere einen Flüssigkeitsraum als Arbeitsraum von einem Gasraum als weiteren Arbeitsraum ab. Als Arbeitsgas kommt bevorzugt Stickstoff zur Anwendung, wobei die Membran die Entkopplung von Gas- und Flüssigkeitsraum übernimmt. Der Flüssigkeitsraum steht ferner mit einem Hydraulikkreislauf der Anlage in Verbindung, so dass bei einem Anstieg des Druckes der Hydrospeicher Druckmittel aufnimmt und das Gas dabei komprimiert wird. Bei sinkendem Druck dehnt sich das vorher verdichtete Gas wiederum aus und verdrängt dabei das Druckmittel (Hydraulikfluid) zurück in den Hydraulickreislauf.Hydraulic accumulators in hydraulic systems are used, among other things, to take up certain volumes of pressurized liquids and to give them back to the system when required. Hydraulic systems with hydropneumatic accumulators with a separating element designed as a membrane are particularly widespread. In particular, the membrane separates a liquid space as a working space from a gas space as a further working space. The preferred working gas is nitrogen, with the membrane decoupling the gas and liquid space. The fluid space is also connected to a hydraulic circuit of the system, so that when the pressure rises, the hydraulic accumulator takes up pressure medium and the gas is compressed in the process. When the pressure drops, the previously compressed gas expands again, displacing the pressure medium (hydraulic fluid) back into the hydraulic circuit.

Im Allgemeinen ist ein Hydrospeicher aus zwei Gehäuseschalen gebildet, die mit ihren freien Öffnungsrändern aneinanderstoßen und jeweils ein Teilvolumen oder jeweils einen Arbeitsraum des Hydrospeichers unter Zwischenschalten der Membran begrenzen. Die stirnseitig aneinanderliegenden Gehäuseschalen sind üblicherweise mittels verschiedener Schweißverfahren an der dahingehenden Stoßstelle miteinander verschweißt, wobei in Abhängigkeit des Schweißverfahrens grundsätzlich es nicht auszuschließen ist, dass heiße Metallperlen oder Metallpartikel im Inneren des Hydrospeichers während des Schweißvorganges zu Beschädigungen an der Membran führen. Dies kann einen negativen Einfluss auf die Standfestigkeit der Membran haben.In general, a hydraulic accumulator is formed from two housing shells, which abut with their free opening edges and each one Limit partial volume or a working space of the hydraulic accumulator with the interposition of the membrane. The end-to-end housing shells are usually welded to one another at the relevant joint by means of various welding processes, and depending on the welding process, it cannot be ruled out that hot metal beads or metal particles inside the hydraulic accumulator lead to damage to the membrane during the welding process. This can have a negative impact on the stability of the membrane.

Aus der FR 1 307 091 A geht ein Druckspeicher in Kugelform hervor. Der Druckspeicher besteht aus zwei Kugelschalen, die an den Rändern ineinandergeschoben sind. Die äußere Kugelschale greift mit ihrem Rand über den Rand der inneren Kugelschale und die Ränder sind so ausgebildet, dass sie im zusammengesetzten Zustand der Kugelschalen mit ihren metallischen Flächen dicht aufeinanderliegen. Die innere Kugelschale an ihrem Außenumfang und die äußere Kugelschale an ihrem Innenumfang weisen jeweils eine Nut auf, in die ein Sprengring eingelegt ist. Zwischen den Rändern ist zudem eine Membran angeordnet.From the FR 1 307 091 A shows a pressure accumulator in spherical shape. The pressure accumulator consists of two spherical shells that are pushed into one another at the edges. The outer spherical shell engages with its edge over the edge of the inner spherical shell and the edges are designed in such a way that, in the assembled state of the spherical shells, their metallic surfaces lie tightly on one another. The inner spherical shell on its outer circumference and the outer spherical shell on its inner circumference each have a groove into which a snap ring is inserted. A membrane is also arranged between the edges.

Ausgehend von diesem Stand der Technik stellt sich die Erfindung die Aufgabe, einen Hydrospeicher der betrachteten Art anzugeben, dessen Membran bei seiner Fertigung nicht in Mitleidenschaft gezogen werden kann.Based on this prior art, the invention has the object of specifying a hydraulic accumulator of the type under consideration, the membrane of which cannot be affected during its manufacture.

Erfindungsgemäß ist diese Aufgabe durch einen Hydrospeicher gelöst, der die Merkmale des Patentanspruches 1 in seiner Gesamtheit aufweist.According to the invention, this object is achieved by a hydraulic accumulator which has the features of claim 1 in its entirety.

Demgemäß besteht eine wesentliche Besonderheit der Erfindung darin, dass ein Öffnungsrand der an der Überlappungsstelle radial außen liegenden Gehäuseschale durch Umformen an den Umfang der radial innen liegenden Gehäuseschale unter Bildung eines Formschlusses angelegt ist. Die Formschlussverbindung ist bevorzugt in abdichtender Weise ausgebildet und dichtet das Innere des Speichers gegenüber der Umgebung ab. Ferner ermöglicht der Formschluss eine Übertragung von Zugspannungen von der ersten zu der zweiten Gehäuseschale des Hydrospeichers. Dadurch ist verhindert, dass die Membran im Inneren des Hydrospeichers in irgendeiner Weise bei der Montage beeinträchtigt wird.Accordingly, an essential feature of the invention is that an opening edge of the housing shell lying radially on the outside at the point of overlap is applied by reshaping to the circumference of the radially inside housing shell with the formation of a form fit. The form-fit connection is preferably designed in a sealing manner and seals the interior of the memory from the environment. Furthermore, the form fit enables tensile stresses to be transmitted from the first to the second housing shell of the hydraulic accumulator. This prevents the membrane inside the hydraulic accumulator from being impaired in any way during assembly.

An den Überlappungsbereich angrenzend kommt ein als Membran aus elastomerem Material gebildetes Trennelement in einer Umfangsnut auf der Innenseite der radial äußeren ersten Gehäuseschale in Anlage und wird mit einem Verankerungsteil gehalten, das aus einem im Querschnitt gesehen im wesentlichen U-förmigen Klemmring besteht.Adjacent to the overlap area, a separating element formed as a membrane made of elastomeric material comes into contact in a circumferential groove on the inside of the radially outer first housing shell and is held by an anchoring part which consists of a clamping ring that is essentially U-shaped in cross section.

Alternativ ist gemäß dem nebengeordneten Anspruch 11 ein Randwulst der Membran zwischen einem im Querschnitt C-förmigen, radial nach innen gezogenen Hohlprofil gehalten, das einstückiger Bestandteil der oberen Gehäuseschale ist.Alternatively, according to the independent claim 11, an edge bead of the membrane is held between a hollow profile with a C-shaped cross section and drawn radially inward, which is an integral part of the upper housing shell.

Bevorzugte Ausführungen ergeben sich aus den Unteransprüchen.Preferred designs emerge from the subclaims.

Bei einer bevorzugten, die Montage des Hydrospeichers erleichternden Ausführungsform ist zumindest eine Gehäuseschale gegen einen Axialanschlag im Inneren des Speichergehäuses gelegt, wobei diese nach Umformung des Öffnungsrandes der radial außen liegenden Gehäuseschale in ihrer Endlage gehalten ist. Der Längsrand des zur Umformung kommenden Öffnungsrandes ist in seiner Wandstärke reduziert und eine Übergangsstelle von dem Längsrand zu der den Arbeitsraum für das Druckmittel bildenden Wand ergibt dergestalt einen radial nach innen gerichteten Absatz, der als Anschlag dient.In a preferred embodiment, which facilitates the assembly of the hydraulic accumulator, at least one housing shell is placed against an axial stop in the interior of the accumulator housing, this being held in its end position after the opening edge of the radially outer housing shell has been deformed. The wall thickness of the longitudinal edge of the opening edge coming to the forming process is reduced and a transition point from the longitudinal edge to the wall forming the working space for the pressure medium thus results in a radially inwardly directed shoulder which serves as a stop.

In einer weiteren vorteilhaften Ausgestaltung des Hydrospeichers ist der Öffnungsrand der an der Überlappungsstelle radial außen liegenden Gehäuseschale an einen Anschlusskörper für das Arbeitsgas unter Bildung eines absatzlosen Überganges der Außenfläche angeschlossen. Bevorzugt ist der Öffnungsrand in abdichtender Weise, vorzugsweise stoffschlüssig mit dem Anschlusskörper verbunden.In a further advantageous embodiment of the hydraulic accumulator, the opening edge of the housing shell lying radially on the outside at the point of overlap is attached to a connection body for the working gas, forming a connecting the stepless transition of the outer surface. The opening edge is preferably connected to the connection body in a sealing manner, preferably in a materially bonded manner.

Bei einer bevorzugten Ausführungsform ist ferner vorgesehen, das Trennelement durch eine Membran zu bilden, deren Umfangsrand an der Überlappung der beiden Gehäuseschalen mit einem Verankerungsteil an der radial inneren und/oder an der radial äußeren Gehäuseschale gehalten ist. Das Verankerungsteil ist dabei bevorzugt aus einem verdickten Randwulst entlang des Umfanges der Membran sowie aus einem diesen Randwulst radial innen umfassenden Klemmring gebildet, wobei der Klemmring den Randwulst in eine nutartige Vertiefung der Gehäuseschale presst und axial sowie radial in dem Speichergehäuse definiert festlegt.In a preferred embodiment it is also provided that the separating element is formed by a membrane, the peripheral edge of which is held at the overlap of the two housing shells with an anchoring part on the radially inner and / or the radially outer housing shell. The anchoring part is preferably formed from a thickened edge bead along the circumference of the membrane and from a clamping ring surrounding this edge bead radially on the inside, the clamping ring pressing the edge bead into a groove-like recess in the housing shell and axially and radially in the storage housing in a defined manner.

Bei einer anderen bevorzugten Ausführungsform kann auch vorgesehen sein, anstelle des Klemmringes einen Öffnungsrand der radial innen liegenden Gehäuseschale mit einem annähernd C-förmigen Hohlprofil auszubilden, das einen radial nach innen und einen im Abstand davon radial nach außen verlaufenden Schenkel ausbildet, zwischen denen der Randwulst der Membran aufgenommen ist. Aufgrund dieser Querschnittsanordnung der radial inneren Gehäuseschale ist dergestalt die Membran entlang ihres freien stirnseitigen Umfassungsrandes gegen die Innenseite der radial äußeren Gehäuseschale dichtend gehalten.In another preferred embodiment it can also be provided, instead of the clamping ring, to form an opening edge of the radially inner housing shell with an approximately C-shaped hollow profile, which forms a leg extending radially inward and a leg extending radially outward at a distance, between which the edge bead the membrane is added. As a result of this cross-sectional arrangement of the radially inner housing shell, the membrane is held in a sealing manner along its free end-face peripheral edge against the inside of the radially outer housing shell.

Zur Gewichtsminimierung des Hydrospeichers können die Gehäuseschalen aus einer Leichtmetalllegierung, vorzugsweise in Form einer Aluminiumlegierung gebildet sein.To minimize the weight of the hydraulic accumulator, the housing shells can be formed from a light metal alloy, preferably in the form of an aluminum alloy.

Die Fluidanschlüsse an den Gehäuseschalen sind bevorzugt durch einstückig mit diesen Gehäuseschalen versehene Anschlusskörper gebildet, die koaxial zu der Längsachse des Hydrospeichers an gegenüberliegenden Enden desselben positioniert sind. Sie gehen in eine im Vergleich zur Wandstärke an den Anschlusskörpern verringerten Wandstärke der Gehäuseschalen über.The fluid connections on the housing shells are preferably formed by connection bodies which are provided in one piece with these housing shells and which are positioned coaxially to the longitudinal axis of the hydraulic accumulator at opposite ends of the same. You go in one compared to the wall thickness on the connection bodies reduced wall thickness of the housing shells.

Nachstehend ist die Erfindung anhand von in der Zeichnung dargestellten Ausführungsbeispielen im Einzelnen erläutert. Es zeigen in prinzipieller und nicht maßstäblicher Darstellung die

Fig. 1
einen Längsschnitt durch ein erstes Ausführungsbeispiel eines erfindungsgemäßen Hydrospeichers; und
Fig. 2
einen weiteren Längsschnitt durch ein zweites Ausführungsbeispiel eines erfindungsgemäßen Hydrospeichers.
The invention is explained in detail below with reference to the exemplary embodiments shown in the drawing. It shows in principle and not to scale the
Fig. 1
a longitudinal section through a first embodiment of a hydraulic accumulator according to the invention; and
Fig. 2
a further longitudinal section through a second embodiment of a hydraulic accumulator according to the invention.

In der Fig. 1 ist in einem Längsschnitt ein Hydrospeicher 1 in Form eines sog. Membranspeichers gezeigt. Dahingehende Hydrospeicher 1 können beispielsweise innerhalb einer hydraulischen Anlage zum Ausgleich von Druckschwankungen, zur Energiespeicherung, dem Auffangen von Pulsationsstößen einer Pumpe etc. dienen. Der Hydrospeicher 1 besteht aus einer ersten Gehäuseschale 2 und einer zweiten Gehäuseschale 3, die um eine Längsachse 4 des Hydrospeichers 1 rotationssymmetrisch angeordnet sind. Die Gehäuseschalen 2, 3 bilden ein Speichergehäuse 8 und sind in Leichtbauweise bevorzugt aus einer Aluminiumlegierung gebildet und in einem Arbeitsgang mittels eines Pressumformverfahrens oder dergleichen erhalten.In the Fig. 1 a hydraulic accumulator 1 in the form of a so-called diaphragm accumulator is shown in a longitudinal section. Related hydraulic accumulators 1 can be used, for example, within a hydraulic system to compensate for pressure fluctuations, to store energy, to absorb pulsation shocks from a pump, etc. The hydraulic accumulator 1 consists of a first housing shell 2 and a second housing shell 3, which are arranged rotationally symmetrically about a longitudinal axis 4 of the hydraulic accumulator 1. The housing shells 2, 3 form a storage housing 8 and are preferably made of a lightweight construction from an aluminum alloy and are obtained in one operation by means of a press forming process or the like.

Mit der ersten Gehäuseschale 2 ist ein Anschlusskörper 22 mit einem Fluideinlass einstückig ausgebildet. Ebenso einstückig ist ein Anschlusskörper 14 für Arbeitsgas, wie Stickstoff, an die zweite Gehäuseschale 3 angeschlossen. Ein freier Öffnungsrand 6 der zweiten Gehäuseschale 3 überlappt mit seiner radialen Innenseite die erste Gehäuseschale 2 entlang ihres Außenumfanges im Bereich der oberen Hälfte, insbesondere des oberen Drittels gesehen in axialer Länge des Speichergehäuses 8.A connection body 22 with a fluid inlet is formed in one piece with the first housing shell 2. A connection body 14 for working gas, such as nitrogen, is also connected in one piece to the second housing shell 3. A free opening edge 6 of the second housing shell 3 overlaps with its radial inside the first housing shell 2 along its outer circumference in the area of the upper half, in particular the upper third, viewed in the axial length of the storage housing 8.

An den Überlappungsbereich 16 angrenzend kommt ein als Membran 15 aus elastomerem Material gebildetes Trennelement 7 in einer Umfangsnut 23 auf der Innenseite der radial äußeren ersten Gehäuseschale 2 in Anlage und wird mit einem Verankerungsteil 17 gehalten, das aus einem im Querschnitt gesehen im wesentlichen U-förmigen Klemmring 19 besteht. Der Klemmring 19 stützt sich axial an dem Öffnungsrand 6 der zweiten Gehäuseschale 3 ab. In Blickrichtung auf die Fig. 1 gesehen verläuft der obere Umfassungsrand des Klemmringes 19 parallel und in horizontaler Anlage mit dem unteren Fußabschnitt der Gehäuseschale 3, wobei der darüberliegende ringnutförmige Hohlraum der Aufnahme eines Dichtmittels (nicht dargestellt) dient, beispielsweise in der Art eines O-Ringes oder Führungsdichtbandes. Die über den Längsrand 12 der unteren Gehäuseschale 2 aufgebrachte Klemmkraft überträgt sich dann insoweit auf die obere Gehäuseschale 3 und mithin auf den oberen Teil des Klemmringes 19, der dergestalt den Randwulst 18 der Membran gegen eine nach unten hin vorgesehene absatzartige Wandstärkenverbreiterung der unteren Gehäuseschale 2 drückt und dergestalt die Membrananordnung definiert festlegt.Adjacent to the overlap region 16, a separating element 7 formed as a membrane 15 made of elastomeric material comes into contact in a circumferential groove 23 on the inside of the radially outer first housing shell 2 and is held by an anchoring part 17 which, when viewed in cross section, is essentially U-shaped Clamping ring 19 consists. The clamping ring 19 is supported axially on the opening edge 6 of the second housing shell 3. Looking towards the Fig. 1 seen, the upper peripheral edge of the clamping ring 19 runs parallel and in horizontal contact with the lower foot section of the housing shell 3, the overlying annular groove-shaped cavity serving to accommodate a sealant (not shown), for example in the form of an O-ring or guide sealing tape. The clamping force applied over the longitudinal edge 12 of the lower housing shell 2 is then transferred to the upper housing shell 3 and consequently to the upper part of the clamping ring 19, which in this way presses the edge bead 18 of the membrane against a step-like widening of the wall thickness of the lower housing shell 2 provided downwards and so fixes the membrane arrangement in a defined manner.

Im Bereich des Fluidanschlusses des Anschlusskörpers 22 ist das Membranmaterial mit einer Verdickung versehen, die dergestalt einen Ventilkörper ausbildet, mit dem die Fluidanschlussstelle verschließbar ist, sobald die Trennmembraneinrichtung in ihrer zuunterst angeordneten, nicht dargestellten Schließstellung unter Einfluss des Arbeitsgases verbracht wird. Damit der Randwulst 18 auch nach unten hin abgestützt ist, ist der Klemmring 19 im unteren Bereich des Randwulstes im Durchmesser wiederum verbreitert und bildet auch insoweit zum Inneren des Speichergehäuses 8 hin eine Abstützung für das membranartige Trennelement 7.In the area of the fluid connection of the connection body 22, the membrane material is provided with a thickening, which in this way forms a valve body with which the fluid connection point can be closed as soon as the separating membrane device is brought into its lower closed position, not shown, under the influence of the working gas. So that the edge bead 18 is also supported downwards, the diameter of the clamping ring 19 in the lower area of the edge bead is again widened and in this respect also forms a support for the membrane-like separating element 7 towards the interior of the storage housing 8.

Bei dem in Fig. 2 gezeigten Ausführungsbeispiel wird hingegen der Randwulst 18 zwischen einem im Querschnitt C-förmigen radial nach innen gezogenen Hohlprofil gehalten, das einstückiger Bestandteil der oberen Gehäuseschale 3 ist. Das den Querschnitt des Öffnungsrandes 6 der zweiten Gehäuseschale 3 definierende Hohlprofil ist aus einem radial nach innen verlaufenden Schenkel 20 und einem radial nach außen verlaufenden Schenkel 21 gebildet. Sofern bei dem Ausführungsbeispiel nach der Fig. 2 dieselben Bezugszeichen eingesetzt werden wie bei der Fig. 1, gelten die insoweit getroffenen Ausführungen auch für das weitere Ausführungsbeispiel. So bewirkt wiederum der Randwulst 18 einen Formschluss in axialer Richtung zwischen den beiden Gehäuseschalen 2, 3.The in Fig. 2 In contrast, the exemplary embodiment shown, the beaded edge 18 is held between a hollow profile which is C-shaped in cross section and is drawn radially inward and which is an integral part of the upper housing shell 3. That is the cross section of the opening edge 6 of the second The hollow profile defining the housing shell 3 is formed from a leg 20 extending radially inward and a leg 21 extending radially outward. If in the embodiment according to the Fig. 2 the same reference numerals are used as in the Fig. 1 , the statements made in this respect also apply to the further exemplary embodiment. The bead 18 in turn effects a form fit in the axial direction between the two housing shells 2, 3.

Die erste Gehäuseschale 2 weist einen in seiner Wandstärke reduzierten Längsrand 12 auf, der sich axial in der Art eines Umfassungsbandes umfangsseitig entlang der zugeordneten Anlagefläche der ersten Gehäuseschale 3 erstreckt. An einer Übergangsstelle 13, an der sich die Wandstärke der ersten Gehäuseschale 2 zu dem Längsrand 12 verjüngt, ist wiederum ein Axialanschlag 11 für die zweite Gehäuseschale 3 zur Anlage an der ersten Gehäuseschale 2 gebildet.The first housing shell 2 has a longitudinal edge 12 of reduced wall thickness, which extends axially in the manner of an encircling band along the circumferential side of the associated contact surface of the first housing shell 3. At a transition point 13, at which the wall thickness of the first housing shell 2 tapers to the longitudinal edge 12, an axial stop 11 is again formed for the second housing shell 3 to rest against the first housing shell 2.

Die Membran 15 trennt einen Arbeitsraum 9 für Arbeitsgas von einem Arbeitsraum 10 für Druckmittel und der Längsrand 12 ist bevorzugt durch Umformen unter Bildung eines Pressverbandes an das im Längsschnitt gesehen obere Umfangsteil der zweiten Gehäuseschale 3 angelegt. Die Wandstärke der zweiten Gehäuseschale 3 ist, um ein widerstandsfähiges Gegenlager zu bilden, hierfür etwa doppelt so stark ausgebildet wie die Wandstärke der ersten Gehäuseschale 2 in diesem Bereich. In vorteilhafter Weise ist dabei vorgesehen, den Öffnungsrand 5 der ersten Gehäuseschale 2 mit der zweiten Gehäuseschale 3 stoffschlüssig in abdichtender Weise miteinander zu verbinden.The membrane 15 separates a working space 9 for working gas from a working space 10 for pressure medium, and the longitudinal edge 12 is preferably applied to the upper peripheral part of the second housing shell 3, seen in longitudinal section, by reshaping, forming an interference fit. The wall thickness of the second housing shell 3 is, in order to form a resistant counter-bearing, for this purpose approximately twice as thick as the wall thickness of the first housing shell 2 in this area. In this case, it is advantageously provided that the opening edge 5 of the first housing shell 2 is connected to one another in a sealing manner with the second housing shell 3 in a materially bonded manner.

Bei beiden Ausführungsbeispielen wird deutlich, dass in besonders bevorzugter Weise die Lagerung der Membran 15 über ihren Randwulst in etwa mittig in Längsrichtung des Speichergehäuses 8 gesehen erfolgt, so dass die Auslenkbewegungen der Membran in beiden Richtungen etwa gleich sind. Dergestalt ergibt sich ein besonders gutes Arbeitsvermögen für die Membran 15 im Betrieb des Hydrospeichers. Die bodenseitig an der Membran 15 angeordnete Wulstverstärkung schützt die Membran 15 auch bei einem Anschlagen gegen den Anschlusskörper 14 der oberen Gehäuseschale 3 im Bereich des absperrbaren Arbeitsgasanschlusses. In jedem Fall wird bei einer Aufwärtsbewegung der Membran 15 über geeignete Rundabschnitte von erster Gehäuseschale 3 im Bereich des Schenkels 21 oder durch die abgesetzte Rundungsnaht am Klemmring 19 ein schonendes Abrollen der Membran 15 in beiden Arbeitsrichtungen gewährleistet. Der gezeigte Hydrospeicher in Leichtbauweise lässt sich, wie dargestellt, sehr kostengünstig herstellen und ist besonders für einen lang andauernden Betrieb auch unter hoher Beanspruchung geeignet.In both exemplary embodiments, it is clear that, in a particularly preferred manner, the bearing of the diaphragm 15 via its edge bead takes place approximately centrally in the longitudinal direction of the storage housing 8, so that the deflection movements of the diaphragm are approximately the same in both directions. This results in a particularly good working capacity for the membrane 15 during operation of the hydraulic accumulator. The bead reinforcement arranged on the bottom of the membrane 15 protects the membrane 15 even if it hits against the connection body 14 of the upper housing shell 3 in the area of the shut-off working gas connection. In any case, with an upward movement of the membrane 15 over suitable round sections of the first housing shell 3 in the area of the leg 21 or the offset rounded seam on the clamping ring 19, a gentle rolling of the membrane 15 in both working directions is guaranteed. The hydraulic accumulator shown in lightweight construction can, as shown, be produced very inexpensively and is particularly suitable for long-term operation even under high stress.

Claims (11)

  1. Hydraulic accumulator comprising a first housing shell (2) and comprising a second housing shell (3), which, in relation to a longitudinal axis (4) of the hydraulic accumulator (1), each overlap with their opening edges (5, 6) in an overlapping region (16) such that they define a partial volume of the hydraulic accumulator (1), and comprising a separating element (7) formed from elastomer material as a membrane (15), said separating element separating inner work chambers (9, 10) from one another in a media-tight manner inside the accumulator housing (8) of the hydraulic accumulator (1) formed by means of the housing shells (2, 3), and wherein the opening edge (5) of the housing shell (2) lying radially outwards is placed, by forming, on the circumference of the housing shell (3) lying radially inwards to form a positive connection, characterised in that the separating element (7) comes into contact, adjacent to the overlapping region (16), in a circumferential groove (23) on the inside of the radially outer first housing shell (2) and is held with an anchoring element (17), which consists substantially of a U-shaped clamping ring (19) when viewed in cross-section.
  2. Hydraulic accumulator according to claim 1, characterised in that at least one housing shell (3) is inserted into the accumulator housing (8) against a stop (11) inside said accumulator housing.
  3. Hydraulic accumulator according to either claim 1 or claim 2, characterised in that a longitudinal edge (12) of the opening edge (5) of the first housing shell (2), said edge being used for forming, has a reduced wall thickness.
  4. Hydraulic accumulator according to claim 3, characterised in that a transition point (13) between the different wall thicknesses forms the stop (11) for the housing shell (3) lying radially inwards.
  5. Hydraulic accumulator according to any one of claims 1 to 4, characterised in that the opening edge (5) of the housing shell (2) lying radially outwards is adjacent to a closure body (14) for a work gas and forms a material-uniting connection with the corresponding connection body (14) in a sealing manner.
  6. Hydraulic accumulator according to any one of claims 1 to 5, characterised in that the movable separating element (7) is formed by a membrane (15), the circumferential edge of which is held on the overlapping region (16) of both housing shells (2, 3) with an anchoring element (17) on the radially inner or radially outer housing shell (3, 2).
  7. Hydraulic accumulator according to claim 6, characterised in that the anchoring element (17) is formed by a thickened edge bead (18) of the membrane (15) and/or a clamping ring (19) for the circumferential edge of the membrane (15).
  8. Hydraulic accumulator according to any one of claims 1 to 6, characterised in that the opening edge (6) of the housing shell (3) lying radially inwards forms an approximately C-shaped hollow profile drawn radially inwards, which forms one leg (20) extending radially inwards and one leg (21) extending radially outwards at a distance, between which the edge bead (18) of the membrane (15) can be received.
  9. Hydraulic accumulator according to any one of claims 1 to 8, characterised in that the housing shells (2, 3) are formed from a light metal alloy.
  10. Hydraulic accumulator according to any one of claims 1 to 9, characterised in that connections on the housing shells (2, 3) are formed by connection bodies (14, 22) that are coaxial with respect to the longitudinal axis (4) of the hydraulic accumulator (1), the wall of the respective housing shell (2, 3), with a wall thickness which is reduced compared to the thickness of the connection bodies (14, 22), being attached to said connection bodies.
  11. Hydraulic accumulator comprising a first housing shell (2) and comprising a second housing shell (3), which, in relation to a longitudinal axis (4) of the hydraulic accumulator (1), each overlap with their opening edges (5, 6) in an overlapping region (16) such that they define a partial volume of the hydraulic accumulator (1), and comprising a separating element (7) formed from elastomer material as a membrane (15), said separating element separating inner work chambers (9, 10) from one another in a media-tight manner inside the accumulator housing (8) of the hydraulic accumulator (1) formed by means of the housing shells (2, 3), and wherein the opening edge (5) of the housing shell (2) lying radially outwards is placed, by forming, on the circumference of the housing shell (3) lying radially inwards to form a positive connection, characterised in that the separating element (7) comes into contact, adjacent to the overlapping region, in a circumferential groove (23) on the inside of the radially outer first housing shell (2) and in that an edge bead (18) of the membrane (15) is held between a hollow profile (20, 21) drawn radially inwards with a C-shaped cross-section, said hollow profile forming an integral part of the upper housing shell (3).
EP10715709.1A 2009-05-15 2010-04-22 Hydraulic accumulator Active EP2430318B1 (en)

Applications Claiming Priority (2)

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DE102009021463A DE102009021463A1 (en) 2009-05-15 2009-05-15 hydraulic accumulator
PCT/EP2010/002465 WO2010130332A1 (en) 2009-05-15 2010-04-22 Hydraulic accumulator

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EP2430318A1 EP2430318A1 (en) 2012-03-21
EP2430318B1 true EP2430318B1 (en) 2021-06-09

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US (1) US8746286B2 (en)
EP (1) EP2430318B1 (en)
JP (1) JP5695032B2 (en)
CN (1) CN102428283A (en)
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WO (1) WO2010130332A1 (en)

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JP5695032B2 (en) 2015-04-01
US20120037253A1 (en) 2012-02-16
JP2012526951A (en) 2012-11-01
US8746286B2 (en) 2014-06-10
WO2010130332A1 (en) 2010-11-18
CN102428283A (en) 2012-04-25
EP2430318A1 (en) 2012-03-21
DE102009021463A1 (en) 2010-11-18

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