EP2518328A1 - Pressure accumulator and use of a pressure equaliser body for same - Google Patents

Pressure accumulator and use of a pressure equaliser body for same Download PDF

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Publication number
EP2518328A1
EP2518328A1 EP11003411A EP11003411A EP2518328A1 EP 2518328 A1 EP2518328 A1 EP 2518328A1 EP 11003411 A EP11003411 A EP 11003411A EP 11003411 A EP11003411 A EP 11003411A EP 2518328 A1 EP2518328 A1 EP 2518328A1
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EP
European Patent Office
Prior art keywords
pressure
accumulator
compensation body
vessel
pressure accumulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11003411A
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German (de)
French (fr)
Inventor
Juergen Jaeckel
Marco Schoenwaelder
Michael Groesch
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Carl Freudenberg KG
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Carl Freudenberg KG
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Publication date
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Priority to EP11003411A priority Critical patent/EP2518328A1/en
Publication of EP2518328A1 publication Critical patent/EP2518328A1/en
Withdrawn legal-status Critical Current

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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
    • F15B1/086—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor the gas cushion being entirely enclosed by the separating means, e.g. foam or gas-filled balls
    • 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
    • F15B2201/3154—Accumulator separating means having flexible separating means the flexible separating means being completely enclosed, e.g. using gas-filled balls or foam
    • 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
    • F15B2201/4053—Housings characterised by the material

Definitions

  • the invention relates to a pressure accumulator, comprising a pressure vessel which is flow-connected with a hydraulic system, wherein in the pressure vessel, a pressure peak compensation device is arranged.
  • the pressure vessel comprises two pressure chambers which are separated from one another by a separation chamber, of which the first chamber is filled with a compressed gas and the second chamber is connected to a hydraulic circuit.
  • the partition between the two chambers consists of at least one rotationally symmetrical metal diaphragm which has concentric corrugations and which is provided on its side facing the second chamber with an elastic covering.
  • the elastic covering on the side of the membrane facing the second chamber is provided in order to achieve complete emptying of the second chamber from the hydraulic fluid without damaging / destroying the metal membrane due to excessive mechanical stresses.
  • the pressure peak compensation device is formed in the known pressure accumulator by the filled with compressed gas first chamber, which is bounded by the partition wall in the form of elastically yielding metal membrane, the partition hermetically separates the two pressure chambers from each other.
  • the invention has for its object to further develop a pressure accumulator so that it has a simple structure and therefore is inexpensive to produce.
  • the pressure peak compensation device is formed by a compressible pressure compensation body, which is arranged loosely in the pressure vessel.
  • Such an accumulator can always be used when complete emptying of the pressure vessel from the hydraulic fluid is not required.
  • the pressure accumulator according to the invention is particularly simple and inexpensive to produce. This is mainly due to the fact that the compressible pressure compensation body is arranged loosely in the pressure vessel. A liquid-tight assignment within the pressure vessel, such as in a pressure accumulator with two pressure chambers, which are hermetically separated from each other by a partition, is not required in the pressure accumulator according to the invention. Where the pressure compensation body is located within the pressure vessel plays no role for the function of the pressure accumulator according to the invention. Occurs in the hydraulic system to a pressure peak, which is to be compensated by the pressure accumulator, the pressure compensation body is elastically yielding deformed by the pressure peak. If then normal normal pressure returns in the hydraulic system, the pressure compensation body expands and resumes its production-conditioned, original shape.
  • the pressure compensation body may be formed by a foam body.
  • Foam body are in different specification, which are adapted to the particular application, easy and inexpensive to produce.
  • the foam body is therefore according to an advantageous embodiment of a substantially closed-cell foam.
  • the pressure compensation body can, for. B. consist of a closed-cell polyurethane foam, which is finely porous and highly compressible.
  • foams may vary in hardness, depending on the particular Application, vary, are sufficiently elastic, rot-proof, resistant to the medium flowing in the hydraulic system and against heat and cold as well as against aging. Due to the structure and the material properties, the damping behavior of the foam body can be adapted to the respective application.
  • the foam body may be enclosed by an elastically resilient sheathing impermeable to the medium to be stored. Such an embodiment may, for. B. then apply, if the foam body consists of a not sufficiently closed-cell foam.
  • the jacket prevents the medium to be stored from penetrating into the foam body and therefore adversely affecting the effect of the pressure-peak compensation device.
  • the pressure chamber may be provided on the inside with a coating.
  • the coating can consist of PTFE or a bonded coating and thus has friction-reducing properties.
  • Such a configuration is advantageous because the pressure compensation body is arranged loosely in the pressure vessel, therefore, can move freely and thus also touches the inner wall of the pressure chamber during the intended use of the pressure accumulator. Due to the friction-reducing coating of the inner wall of the pressure chamber, the inner wall is smooth. Friction between the pressure compensation body and the inner wall and thereby abbrassiver wear on the pressure compensation body is therefore limited to a minimum, so that the Pressure accumulator consistently good performance characteristics during a long service life.
  • the accumulator has a very low-part construction.
  • the accumulator comprises only two components, namely the pressure vessel and the pressure vessel loosely arranged pressure compensation body. Such an accumulator is easy and inexpensive to produce.
  • the pressure compensation body may have different geometries and / or be made of different materials.
  • the pressure compensating body may be, for example, annular, cylindrical or spherical.
  • a pressure compensation body as described above, can be used according to the invention in a pressure vessel of a pressure accumulator.
  • a schematically illustrated pressure accumulator is shown.
  • the pressure accumulator comprises a pressure vessel 1, the z. B. consists of a metallic material.
  • the pressure vessel 1 is connected to a hydraulic system, not shown here.
  • the pressure vessel 1 has only one pressure chamber 6, which is provided on the inside with a friction-reducing coating 7, for example made of PTFE. This coating 7 is provided in order to limit friction and thus wear on the pressure compensation body 3 arranged loosely in the pressure vessel 1 to a minimum.
  • the pressure-peak compensation device 2 is formed by the compressible pressure compensation body 3, which is arranged loosely within the pressure vessel 1.
  • the pressure compensation body 3 consists of a closed-cell polyurethane foam. About the porosity of the foam its compressibility and thus the performance characteristics of the pressure accumulator can be adjusted.
  • pressure peaks occur in the hydraulic system, these pressure peaks are damped by the pressure compensation body 3. At high pressures, the pressure compensation body 3 is compressed in the pressure chamber 6 and thereby dissipates energy. Are the pressure peaks within the hydraulic system degraded again, the pressure compensation body 3 relaxes and resumes its shape, which he had before the introduction of the pressure peak in the pressure vessel 1.
  • a pressure compensation body 3 In Fig. 2 an embodiment of a pressure compensation body 3 is shown.
  • the pressure compensation body 3 consists of a closed-cell foam body. 4
  • a further embodiment of a pressure compensation body 3 is shown.
  • This pressure compensation body 3 consists of a foam body 4 with a core 8, which is surrounded by a compressible, impermeable to the medium to be stored sheath 5. It is advantageous that the core 8 of the foam body 4 is protected by the sheath 5 from direct exposure to the medium to be stored.
  • a pressure compensation body 3 which consists of a closed-cell foam body 4 and is formed of the same material.
  • the foam body may, for example, have the shape of a cylinder or a sphere.
  • a pressure compensation body 3 is shown in a perspective view.
  • the pressure compensation body 3 shown essentially corresponds to the pressure compensation body 3 Fig. 3 ,
  • the jacket 5 on the front side of the cylindrical pressure compensation body 3 has been removed in order to show the core of the pressure compensation body 3, which is designed as a foam body 4.

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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)

Abstract

The accumulator has a pressure container (1) flow-conductively connected to a hydraulic system, and a pressure peak compensation device (2) arranged in the container, which is made of metallic material. The pressure peak compensation device is formed by a compressible pressure compensating body (3), which is loosely arranged in the container. The compensating body is formed by a closed cell foam body (4). The foam body is surrounded by a resilient sheath that is impermeable to medium to be stored. An inner side of a pressure chamber is provided with a coating (7) made of PTFE.

Description

Technisches GebietTechnical area

Die Erfindung betrifft einen Druckspeicher, umfassend einen Druckbehälter der strömungsleitend mit einem hydraulischen System verbindbar ist, wobei in dem Druckbehälter eine Druckspitzen-Kompensationseinrichtung angeordnet ist.The invention relates to a pressure accumulator, comprising a pressure vessel which is flow-connected with a hydraulic system, wherein in the pressure vessel, a pressure peak compensation device is arranged.

Stand der TechnikState of the art

Derartige Druckspeicher sind allgemein bekannt, z. B. aus der DE 102 35 080 B3 . Der Druckbehälter umfasst zwei durch eine Trennwann voneinander getrennte Druckkammern, von denen die erste Kammer mit einem Druckgas gefüllt ist und die zweite Kammer mit einem hydraulischen Kreislauf verbunden ist. Die Trennwand zwischen den beiden Kammern besteht aus wenigstens einer rotationssymmetrischen Metallmembran, die konzentrische Wellungen hat und die auf ihrer der zweiten Kammer zugewandten Seite mit einem elastischen Belag versehen ist. Im entleerten Zustand des vorbekannten Druckspeichers, wenn das hydraulische Fluid vollständig von der Trennwand aus der zweiten Kammer verdrängt ist, legt sich die Trennwand mit ihrem elastischen Belag vollständig an die Innenseite des Druckbehälters an. Durch die Metallmembran wird erreicht, dass das Druckgas aus der ersten Kammer nicht durch die Trennwand hindurch in die zweite Kammer diffundiert. Der elastische Belag auf der der zweiten Kammer zugewandten Seite der Membran ist vorgesehen, um ein vollständiges Entleeren der zweiten Kammer von dem hydraulischen Fluid zu erreichen, ohne dass die Metallmembran wegen zu großer mechanischer Belastungen beschädigt/zerstört wird. Die Druckspitzen-Kompensationseinrichtung ist bei dem vorbekannten Druckspeicher durch die mit Druckgas gefüllte erste Kammer gebildet, die von der Trennwand in Form der elastisch nachgiebigen Metallmembran begrenzt ist, wobei die Trennwand die beiden Druckkammern hermetisch voneinander trennt.Such accumulators are well known, for. B. from the DE 102 35 080 B3 , The pressure vessel comprises two pressure chambers which are separated from one another by a separation chamber, of which the first chamber is filled with a compressed gas and the second chamber is connected to a hydraulic circuit. The partition between the two chambers consists of at least one rotationally symmetrical metal diaphragm which has concentric corrugations and which is provided on its side facing the second chamber with an elastic covering. In the deflated state of the prior art pressure accumulator, when the hydraulic fluid is completely displaced from the partition wall of the second chamber, sets the partition with its elastic lining completely against the inside of the pressure vessel. Through the metal membrane is achieved that the compressed gas from the first chamber not diffused through the partition into the second chamber. The elastic covering on the side of the membrane facing the second chamber is provided in order to achieve complete emptying of the second chamber from the hydraulic fluid without damaging / destroying the metal membrane due to excessive mechanical stresses. The pressure peak compensation device is formed in the known pressure accumulator by the filled with compressed gas first chamber, which is bounded by the partition wall in the form of elastically yielding metal membrane, the partition hermetically separates the two pressure chambers from each other.

Dabei ist jedoch zu beachten, dass der vorbekannte Druckspeicher durch die beiden Kammern und die zwischen den beiden Kammern fluiddicht angeordnete Trennwand, die einen sandwichartigen Aufbau hat, vergleichsweise aufwendig und deshalb in wirtschaftlicher Hinsicht teuer ist.It should be noted, however, that the known pressure accumulator by the two chambers and the fluid-tightly arranged between the two chambers partition, which has a sandwich-like structure, is relatively expensive and therefore expensive in economic terms.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, einen Druckspeicher derart weiterzuentwickeln, dass dieser einen einfachen Aufbau aufweist und deshalb kostengünstig herstellbar ist.The invention has for its object to further develop a pressure accumulator so that it has a simple structure and therefore is inexpensive to produce.

Diese Aufgabe wird erfindungsgemäß durch einen Druckspeicher mit den Merkmalen von Anspruch 1 gelöst. Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche Bezug.This object is achieved by a pressure accumulator with the features of claim 1. In advantageous embodiments, the dependent claims relate.

Zur Lösung der Aufgabe ist es vorgesehen, dass die Druckspitzen-Kompensationseinrichtung durch einen kompressiblen Druckausgleichskörper gebildet ist, der lose im Druckbehälter angeordnet ist.To achieve the object, it is provided that the pressure peak compensation device is formed by a compressible pressure compensation body, which is arranged loosely in the pressure vessel.

Ein solcher Druckspeicher kann immer dann zur Anwendung gelangen, wenn eine vollständige Entleerung des Druckbehälters von dem hydraulischen Fluid nicht erforderlich ist.Such an accumulator can always be used when complete emptying of the pressure vessel from the hydraulic fluid is not required.

Der erfindungsgemäße Druckspeicher ist besonders einfach und kostengünstig herstellbar. Das ist hauptsächlich darauf zurückzuführen, dass der kompressible Druckausgleichskörper lose im Druckbehälter angeordnet ist. Eine flüssigkeitsdichte Zuordnung innerhalb des Druckbehälters, wie beispielsweise bei einem Druckspeicher mit zwei Druckkammern, die durch eine Trennwand hermetisch voneinander getrennt sind, ist bei dem erfindungsgemäßen Druckspeicher nicht erforderlich. Wo sich der Druckausgleichskörper innerhalb des Druckbehälters befindet, spielt für die Funktion des erfindungsgemäßen Druckspeichers keine Rolle. Tritt in dem hydraulischen System eine Druckspitze auf, die durch den Druckspeicher kompensiert werden soll, wird der Druckausgleichskörper durch die Druckspitze elastisch nachgiebig in sich verformt. Stellt sich anschließend in dem hydraulischen System wieder ein normaler bestimmungsgemäßer Druck ein, entspannt sich der Druckausgleichskörper und nimmt wieder seine herstellungsbedingte, ursprüngliche Form ein.The pressure accumulator according to the invention is particularly simple and inexpensive to produce. This is mainly due to the fact that the compressible pressure compensation body is arranged loosely in the pressure vessel. A liquid-tight assignment within the pressure vessel, such as in a pressure accumulator with two pressure chambers, which are hermetically separated from each other by a partition, is not required in the pressure accumulator according to the invention. Where the pressure compensation body is located within the pressure vessel plays no role for the function of the pressure accumulator according to the invention. Occurs in the hydraulic system to a pressure peak, which is to be compensated by the pressure accumulator, the pressure compensation body is elastically yielding deformed by the pressure peak. If then normal normal pressure returns in the hydraulic system, the pressure compensation body expands and resumes its production-conditioned, original shape.

Der Druckausgleichskörper kann durch einen Schaumstoffkörper gebildet sein. Schaumstoffkörper sind in unterschiedlichen Spezifikation, die an die jeweiligen Anwendungsfälle angepasste sind, einfach und kostengünstig herstellbar.The pressure compensation body may be formed by a foam body. Foam body are in different specification, which are adapted to the particular application, easy and inexpensive to produce.

Für die Funktion des Druckausgleichskörpers ist es wesentlich, dass das im hydraulischen System strömende Medium nicht in den Druckausgleichskörper einzudringen vermag. Der Schaumstoffkörper besteht deshalb gemäß einer vorteilhaften Ausgestaltung aus einem im Wesentlichen geschlossenzelligen Schaum. Der Druckausgleichskörper kann z. B. aus einem geschlossenzelligen Polyurethan-Schaum bestehen, der feinporig und stark komprimierbar ist. Derartige Schaumstoffe können in ihrer Härte, abhängig vom jeweiligen Anwendungsfall, variieren, sind ausreichend elastisch, verrottungsfest, beständig gegen das im hydraulischen System strömende Medium und gegen Wärme und Kälte sowie gegen Alterung. Durch die Struktur und die Werkstoffeigenschaften kann das Dämpfungsverhalten des Schaumstoffkörpers an den jeweiligen Anwendungsfall angepasst werden.For the function of the pressure compensation body, it is essential that the medium flowing in the hydraulic system can not penetrate into the pressure compensation body. The foam body is therefore according to an advantageous embodiment of a substantially closed-cell foam. The pressure compensation body can, for. B. consist of a closed-cell polyurethane foam, which is finely porous and highly compressible. Such foams may vary in hardness, depending on the particular Application, vary, are sufficiently elastic, rot-proof, resistant to the medium flowing in the hydraulic system and against heat and cold as well as against aging. Due to the structure and the material properties, the damping behavior of the foam body can be adapted to the respective application.

Der Schaumstoffkörper kann von einer elastisch nachgiebigen, für das zu speichernde Medium undurchlässigen Ummantelung umschlossen sein. Eine solche Ausgestaltung kann z. B. dann zur Anwendung gelangen, wenn der Schaumstoffkörper aus einem nicht ausreichend geschlossenzelligen Schaum besteht. Durch die Ummantelung wird verhindert, dass das zu speichernde Medium in den Schaumstoffkörper eindringt und deshalb die Wirkung der Druckspitzen-Kompensationseinrichtung nachteilig beeinflusst.The foam body may be enclosed by an elastically resilient sheathing impermeable to the medium to be stored. Such an embodiment may, for. B. then apply, if the foam body consists of a not sufficiently closed-cell foam. The jacket prevents the medium to be stored from penetrating into the foam body and therefore adversely affecting the effect of the pressure-peak compensation device.

Besonders vorteilhaft hinsichtlich eines einfachen und kostengünstigen Druckspeichers ist es, wenn der Druckbehälter nur eine Druckkammer aufweist. Eine konstruktiv aufwändige Trennwand, die mehrere Druckkammern hermetisch voneinander trennt, ist deshalb nicht erforderlich.Particularly advantageous in terms of a simple and inexpensive pressure accumulator, it is when the pressure vessel has only one pressure chamber. A structurally complex partition, which hermetically separates several pressure chambers, is therefore not required.

Die Druckkammer kann innenseitig mit einer Beschichtung versehen sein. Die Beschichtung kann aus PTFE oder einem Gleitlack bestehen und weist dadurch reibungsverringernde Eigenschaften auf. Eine derartige Ausgestaltung ist von Vorteil, weil der Druckausgleichskörper lose im Druckbehälter angeordnet ist, sich deshalb frei bewegen kann und folglich während der bestimmungsgemäßen Verwendung des Druckspeichers auch die Innenwand der Druckkammer berührt. Durch die reibungsverringernde Beschichtung der Innenwand der Druckkammer ist die Innenwand glatt. Reibung zwischen dem Druckausgleichskörper und der Innenwand und dadurch abbrassiver Verschleiß am Druckausgleichskörper wird deshalb auf ein Minimum begrenzt, so dass der Druckspeicher gleichbleibend gute Gebrauchseigenschaften während einer langen Gebrauchsdauer aufweist.The pressure chamber may be provided on the inside with a coating. The coating can consist of PTFE or a bonded coating and thus has friction-reducing properties. Such a configuration is advantageous because the pressure compensation body is arranged loosely in the pressure vessel, therefore, can move freely and thus also touches the inner wall of the pressure chamber during the intended use of the pressure accumulator. Due to the friction-reducing coating of the inner wall of the pressure chamber, the inner wall is smooth. Friction between the pressure compensation body and the inner wall and thereby abbrassiver wear on the pressure compensation body is therefore limited to a minimum, so that the Pressure accumulator consistently good performance characteristics during a long service life.

Der Druckspeicher hat einen sehr teilearmen Aufbau. Der Druckspeicher umfasst nur zwei Bauteile, nämlich den Druckbehälter und den im Druckbehälter lose angeordneten Druckausgleichskörper. Ein solcher Druckspeicher ist einfach und kostengünstig herstellbar.The accumulator has a very low-part construction. The accumulator comprises only two components, namely the pressure vessel and the pressure vessel loosely arranged pressure compensation body. Such an accumulator is easy and inexpensive to produce.

Der Druckausgleichskörper kann unterschiedliche Geometrien aufweisen und/oder aus unterschiedlichen Werkstoffen hergestellt sein. Der Druckausgleichskörper kann beispielsweise ringförmig ausgebildet sein, zylindrisch oder kugelförmig.The pressure compensation body may have different geometries and / or be made of different materials. The pressure compensating body may be, for example, annular, cylindrical or spherical.

Ein Druckausgleichskörper, wie zuvor beschrieben, kann erfindungsgemäß in einem Druckbehälter eines Druckspeichers Verwendung finden.A pressure compensation body, as described above, can be used according to the invention in a pressure vessel of a pressure accumulator.

Kurzbeschreibung der ZeichnungBrief description of the drawing

Ein Ausführungsbeispiel des erfindungsgemäßen Druckspeichers und vier Ausführungsbeispiele eines zur Anwendung gelangenden Druckausgleichskörpers werden nachfolgend anhand der Figuren 1 bis 5 näher beschrieben. Diese zeigen jeweils in schematischer Darstellung:

Fig. 1
ein Ausführungsbeispiel eines Druckspeichers,
Fig. 2 bis 4
jeweils ein Ausführungsbeispiel eines Druckausgleichskörpers in geschnittener Darstellung und
Fig. 5
einen weiteren Druckausgleichskörper in einer perspektivischen Ansicht.
An embodiment of the pressure accumulator according to the invention and four embodiments of an applied pressure compensation body are described below with reference to FIGS. 1 to 5 described in more detail. These show in a schematic representation:
Fig. 1
an embodiment of a pressure accumulator,
Fig. 2 to 4
in each case an embodiment of a pressure compensation body in a sectional view and
Fig. 5
a further pressure compensating body in a perspective view.

Ausführung der ErfindungEmbodiment of the invention

In Fig. 1 ist ein schematisch dargestellter Druckspeicher gezeigt. Der Druckspeicher umfasst einen Druckbehälter 1, der z. B. aus einem metallischen Werkstoff besteht. Der Druckbehälter 1 ist mit einem hier nicht dargestellten hydraulischen System verbunden. Der Druckbehälter 1 weist nur eine Druckkammer 6 auf, die innenseitig mit einer reibungsverringernden Beschichtung 7, zum Beispiel aus PTFE, versehen ist. Diese Beschichtung 7 ist vorgesehen, um Reibung und damit Verschleiß am lose im Druckbehälter 1 angeordneten Druckausgleichskörper 3 auf ein Minimum zu begrenzen.In Fig. 1 a schematically illustrated pressure accumulator is shown. The pressure accumulator comprises a pressure vessel 1, the z. B. consists of a metallic material. The pressure vessel 1 is connected to a hydraulic system, not shown here. The pressure vessel 1 has only one pressure chamber 6, which is provided on the inside with a friction-reducing coating 7, for example made of PTFE. This coating 7 is provided in order to limit friction and thus wear on the pressure compensation body 3 arranged loosely in the pressure vessel 1 to a minimum.

Die Druckspitzen-Kompensationseinrichtung 2 ist durch den kompressiblen Druckausgleichskörper 3 gebildet, der lose innerhalb des Druckbehälters 1 angeordnet ist. In den hier dargestellten Ausführungsbeispielen besteht der Druckausgleichskörper 3 aus einem geschlossenzelligen Polyurethan-Schaum. Über die Porigkeit des Schaums können dessen Komprimierbarkeit und damit die Gebrauchseigenschaften des Druckspeichers eingestellt werden.The pressure-peak compensation device 2 is formed by the compressible pressure compensation body 3, which is arranged loosely within the pressure vessel 1. In the exemplary embodiments illustrated here, the pressure compensation body 3 consists of a closed-cell polyurethane foam. About the porosity of the foam its compressibility and thus the performance characteristics of the pressure accumulator can be adjusted.

Entstehen in dem hydraulischen System Druckspitzen, werden diese Druckspitzen durch den Druckausgleichskörper 3 gedämpft. Bei hohen Drücken wird der Druckausgleichskörper 3 in der Druckkammer 6 zusammengedrückt und dissipiert dadurch Energie. Sind die Druckspitzen innerhalb des hydraulischen Systems wieder abgebaut, entspannt sich der Druckausgleichskörper 3 und nimmt seine Form wieder an, die er vor Einleitung der Druckspitze in den Druckbehälter 1 hatte.If pressure peaks occur in the hydraulic system, these pressure peaks are damped by the pressure compensation body 3. At high pressures, the pressure compensation body 3 is compressed in the pressure chamber 6 and thereby dissipates energy. Are the pressure peaks within the hydraulic system degraded again, the pressure compensation body 3 relaxes and resumes its shape, which he had before the introduction of the pressure peak in the pressure vessel 1.

In Fig. 2 ist ein Ausführungsbeispiel eines Druckausgleichskörpers 3 gezeigt. Der Druckausgleichskörper 3 besteht aus einem geschlossenzelligen Schaumstoffkörper 4.In Fig. 2 an embodiment of a pressure compensation body 3 is shown. The pressure compensation body 3 consists of a closed-cell foam body. 4

In Fig. 3 ist ein weiteres Ausführungsbeispiel eines Druckausgleichskörpers 3 gezeigt. Dieser Druckausgleichskörper 3 besteht aus einem Schaumstoffkörper 4 mit einem Kern 8, der von einer kompressiblen, für das zu speichernde Medium undurchlässigen Ummantelung 5 umschlossen ist. Hierbei ist von Vorteil, dass der Kern 8 des Schaumstoffkörpers 4 durch die Ummantelung 5 vor einer direkten Beaufschlagung mit dem zu speichernden Medium geschützt ist.In Fig. 3 a further embodiment of a pressure compensation body 3 is shown. This pressure compensation body 3 consists of a foam body 4 with a core 8, which is surrounded by a compressible, impermeable to the medium to be stored sheath 5. It is advantageous that the core 8 of the foam body 4 is protected by the sheath 5 from direct exposure to the medium to be stored.

In Fig. 4 ist ein Druckausgleichskörper 3 gezeigt, der aus einem geschlossenzelligen Schaumstoffkörper 4 besteht und materialeinheitlich ausgebildet ist. Der Schaumstoffkörper kann beispielsweise die Form eines Zylinders oder einer Kugel aufweisen.In Fig. 4 a pressure compensation body 3 is shown, which consists of a closed-cell foam body 4 and is formed of the same material. The foam body may, for example, have the shape of a cylinder or a sphere.

In Fig. 5 ist ein Druckausgleichskörper 3 in einer perspektivischen Ansicht gezeigt. Der gezeigte Druckausgleichskörper 3 entspricht im Wesentlichen dem Druckausgleichskörper 3 aus Fig. 3. Die Ummantelung 5 an der Stirnseite des zylinderförmigen Druckausgleichskörpers 3 wurde entfernt, um den Kern des Druckausgleichskörpers 3 zu zeigen, der als Schaumstoffkörper 4 ausgebildet ist.In Fig. 5 a pressure compensation body 3 is shown in a perspective view. The pressure compensation body 3 shown essentially corresponds to the pressure compensation body 3 Fig. 3 , The jacket 5 on the front side of the cylindrical pressure compensation body 3 has been removed in order to show the core of the pressure compensation body 3, which is designed as a foam body 4.

Claims (8)

Druckspeicher, umfassend einen Druckbehälter (1), der strömungsleitend mit einem hydraulischen System verbindbar ist, wobei in dem Druckbehälter (1) eine Druckspitzen-Kompensationseinrichtung (2) angeordnet ist, dadurch gekennzeichnet, dass die Druckspitzen-Kompensationseinrichtung (2) durch einen kompressiblen Druckausgleichskörper (3) gebildet ist, der lose im Druckbehälter (1) angeordnet ist.Pressure accumulator, comprising a pressure vessel (1) which is flow-connected to a hydraulic system, wherein in the pressure vessel (1) a pressure peak compensation device (2) is arranged, characterized in that the pressure peak compensation device (2) by a compressible pressure compensation body (3) is formed, which is arranged loosely in the pressure vessel (1). Druckspeicher nach Anspruch 1, dadurch gekennzeichnet, dass der Druckausgleichskörper (3) durch einen Schaumstoffkörper (4) gebildet ist.Pressure accumulator according to claim 1, characterized in that the pressure compensation body (3) by a foam body (4) is formed. Druckspeicher nach Anspruch 2, dadurch gekennzeichnet, dass der Schaumstoffkörper (4) aus einem im Wesentlichen geschlossenzelligen Schaum besteht.Pressure accumulator according to claim 2, characterized in that the foam body (4) consists of a substantially closed-cell foam. Druckspeicher nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass der Schaumstoffkörper (4) von einer elastisch nachgiebigen, für das zu speichernde Medium undurchlässigen Ummantelung (5) umschlossen ist.Pressure accumulator according to one of claims 2 or 3, characterized in that the foam body (4) by an elastically resilient, impermeable to the medium to be stored sheath (5) is enclosed. Druckspeicher nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Druckbehälter (1) nur eine Druckkammer (6) aufweist.Pressure accumulator according to one of claims 1 to 4, characterized in that the pressure vessel (1) has only one pressure chamber (6). Druckspeicher nach Anspruch 5, dadurch gekennzeichnet, dass die Druckkammer (6) innenseitig mit einer Beschichtung (7) versehen ist.Pressure accumulator according to claim 5, characterized in that the pressure chamber (6) is provided on the inside with a coating (7). Druckspeicher nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass dieser nur zwei Bauteile umfasst, nämlich den Druckbehälter (1) und den im Druckbehälter (1) lose angeordneten Druckausgleichskörper (3).Pressure accumulator according to one of claims 1 to 6, characterized in that it comprises only two components, namely the pressure vessel (1) and the pressure vessel (1) loosely arranged pressure compensation body (3). Verwendung eines Druckausgleichskörpers (3) in einem Druckbehälter (1) eines Druckspeichers nach einem der Ansprüche 1 bis 7.Use of a pressure compensation body (3) in a pressure vessel (1) of a pressure accumulator according to one of claims 1 to 7.
EP11003411A 2011-04-26 2011-04-26 Pressure accumulator and use of a pressure equaliser body for same Withdrawn EP2518328A1 (en)

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EP11003411A EP2518328A1 (en) 2011-04-26 2011-04-26 Pressure accumulator and use of a pressure equaliser body for same

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EP11003411A EP2518328A1 (en) 2011-04-26 2011-04-26 Pressure accumulator and use of a pressure equaliser body for same

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120180755A1 (en) * 2011-01-13 2012-07-19 Uwe Jung Injector
DE102014213108B3 (en) * 2014-07-07 2015-11-05 Robert Bosch Gmbh Power module with fluid cooling
GB2566094A (en) * 2017-09-04 2019-03-06 Ideal Boilers Ltd Expansion vessel incorporating a foam core
WO2021146772A1 (en) * 2020-01-21 2021-07-29 UGT Group Pty Ltd Accumulator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1197524A (en) * 1968-03-25 1970-07-08 Automotive Prod Co Ltd Improvements in or relating to Liquid Pressure Storage Devices
DE1650095A1 (en) * 1967-11-07 1970-08-13 Langen & Co Hydro-pneumatic pressure accumulator
DE3333597A1 (en) * 1983-09-16 1985-04-18 Wilkhahn Wilkening + Hahne GmbH + Co, 3252 Bad Münder Accumulator
DE10235080B3 (en) 2002-07-31 2004-01-22 Carl Freudenberg Kg Hydropneumatic pressure accumulator
DE102004011443A1 (en) * 2004-03-09 2005-09-22 Bosch Rexroth Ag Low-pressure hydraulic accumulator for damping pressure fluctuations in a tank line of a hydraulic work unit comprises a housing accommodating at least one solid compressible body with a pore system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1650095A1 (en) * 1967-11-07 1970-08-13 Langen & Co Hydro-pneumatic pressure accumulator
GB1197524A (en) * 1968-03-25 1970-07-08 Automotive Prod Co Ltd Improvements in or relating to Liquid Pressure Storage Devices
DE3333597A1 (en) * 1983-09-16 1985-04-18 Wilkhahn Wilkening + Hahne GmbH + Co, 3252 Bad Münder Accumulator
DE10235080B3 (en) 2002-07-31 2004-01-22 Carl Freudenberg Kg Hydropneumatic pressure accumulator
DE102004011443A1 (en) * 2004-03-09 2005-09-22 Bosch Rexroth Ag Low-pressure hydraulic accumulator for damping pressure fluctuations in a tank line of a hydraulic work unit comprises a housing accommodating at least one solid compressible body with a pore system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120180755A1 (en) * 2011-01-13 2012-07-19 Uwe Jung Injector
DE102014213108B3 (en) * 2014-07-07 2015-11-05 Robert Bosch Gmbh Power module with fluid cooling
GB2566094A (en) * 2017-09-04 2019-03-06 Ideal Boilers Ltd Expansion vessel incorporating a foam core
GB2566094B (en) * 2017-09-04 2021-07-14 Ideal Boilers Ltd Expansion vessel incorporating a foam core
WO2021146772A1 (en) * 2020-01-21 2021-07-29 UGT Group Pty Ltd Accumulator

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