EP2588762B1 - Pressure store and insert part for a pressure store - Google Patents

Pressure store and insert part for a pressure store Download PDF

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Publication number
EP2588762B1
EP2588762B1 EP11727121.3A EP11727121A EP2588762B1 EP 2588762 B1 EP2588762 B1 EP 2588762B1 EP 11727121 A EP11727121 A EP 11727121A EP 2588762 B1 EP2588762 B1 EP 2588762B1
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EP
European Patent Office
Prior art keywords
compartment
pressure accumulator
housing
support body
retaining
Prior art date
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EP11727121.3A
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German (de)
French (fr)
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EP2588762A1 (en
Inventor
Norbert Weber
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Hydac Technology GmbH
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Hydac Technology GmbH
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Publication of EP2588762A1 publication Critical patent/EP2588762A1/en
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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
    • 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
    • F15B1/12—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery
    • F15B1/14—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery by means of a rigid annular supporting member
    • 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
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • 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
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • 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
    • F15B2201/3158—Guides for the flexible separating means, e.g. for a collapsed bladder

Definitions

  • the invention relates to a pressure accumulator comprising a housing, a arranged between the housing and a flexible separation membrane first subspace, arranged between the separation membrane and a support body second subspace, and adjacent to the second subspace, the closure of the housing forming the head part, wherein the first Partial space with a first fluid and the second subspace with a second fluid can be filled, wherein the first and the second subspace vary by movements of the separation membrane depending on the respective filling state in their respective size, and wherein on the head part, a holding body is provided on which the Opening edge of the separation membrane is anchored.
  • Such an accumulator is off DE 101 13 415 A1 known.
  • a flexible separating element is arranged in a storage housing, formed by a pipe end piece, and surrounds a support body having fluid passages.
  • the support body has at least sections on a non-circular cross-sectional shape.
  • the separating element is anchored to form a seal on the storage housing so that each separate receiving spaces are formed on the outside and inside of the separating element.
  • a centrally located, through bore forms a passage leading to the internal receiving space of the storage for a storage medium.
  • a gas valve is provided for filling the outside gas space.
  • the known pressure accumulator can be used for energy storage, for example in conjunction with vehicle suspensions, or as a pulsation damper. Furthermore, the known solution is particularly suitable for damping pressure peaks in hydraulic or other fluid power systems. For use as an accumulator for storage media in the form of chemically aggressive fluids, such as urea-water solution, the known solution leaves nothing to be desired.
  • a pressure accumulator comprising a container main body with an outer tube of cylindrical shape, at one end of a side plate and at the other end a lid is arranged, at least one inlet opening and an outlet opening, which are formed on the outer tube, and a bladder or A membrane for dividing the interior of the container main body into a gas chamber and a liquid chamber, wherein an opening of the bubble is sealed by the lid.
  • An insert is arranged to project into the bladder for the purpose of reducing the volume of the gas chamber.
  • the insert is formed of a foot part, a middle part and a head part, wherein the head part is kept in contact with the bottom of the membrane, which makes it possible to prevent damage to the membrane by repeated contraction. In the contracted state, the bladder or membrane rests against the insert.
  • the GB 877,800 A describes a device for damping pressure pulses in fluid lines with a spherical housing, in which a flexible separation membrane between a first subspace and a second subspace is arranged.
  • the first subspace is the fluid to be damped.
  • the first subspace is between the housing and the Separating membrane arranged.
  • the second compartment is located between the separation membrane and a spherical support body.
  • the second compartment enclosed by the separation membrane is filled with a pressurized gas.
  • the housing is formed in two parts and has a head part, on which a holding body is arranged, on which an opening edge of the separating membrane can be anchored.
  • the head part on a connectable to the housing cover part with inner wall parts in the form of a concentric to the axis of the housing spherical cap.
  • Pressure accumulators of this type are widely used in various sizes and structural designs to receive and deliver varying volumes of subject fluids that are under the operating pressure of a fluid system connected to the fluid side, with the bladder on its gas side under a biasing pressure of the working gas forming a pressure pad ,
  • the reliability of the pressure accumulator depends primarily on the usually made of a plastic material, especially butyl, existing from memory bladder, which is not only exposed to mechanical stresses in operation, but should also be resistant to chemically aggressive storage fluids.
  • aggressive fluids such as urea-water solutions
  • urea injection is increasingly being used in automotive engineering to reduce nitrogen oxide (NOx) emissions by injecting it into the exhaust gas stream from internal combustion engines.
  • NOx nitrogen oxide
  • the invention has the object to provide a pressure accumulator available, which is characterized in particular in connection with aggressive storage media by improved reliability and ease of installation.
  • a significant feature of the invention is that within the cover part of the holding body is arranged such that between the outer wall in the form of spherical surface parts and the inner wall parts of the lid part, a gap for receiving a bordering on the edge of the opening edge region Separating membrane is formed.
  • the housing typically has a head part which adjoins the second subspace and forms the closure of the housing.
  • the housing is expediently cup-shaped, wherein the first compartment is arranged on the bottom side.
  • a connection device for the second fluid can be provided in the head part.
  • a particularly secure anchoring of the separating membrane can be achieved if the holding body has, in an axially offset from its holding part in the direction of the connection means a machined into the outer wall annular groove in the anchoring of the separation membrane engages a peripheral edge surrounding the edge bead.
  • connection device has a screw socket, which engages through an opening concentric to the central axis of the cover part and the by screwing with the cover part, the holding body against the inner wall of the cover part pulls and clamped the located in the gap edge region of the separation membrane.
  • the invention further comprises an insert part for a pressure accumulator comprising a head part forming the closure of a housing, on which a holding body for anchoring the opening edge of a separating membrane is provided, and a supporting body for abutment of the separating membrane, wherein the holding body forms a holding part, on which the Support body is arranged, which is characterized in that the holding body in the region of the holding part forms a circular cylinder, at the edge region of which one or more latching elements are formed, which form with mating elements on the support body an anchoring this snap connection.
  • the arrangement is made such that the holding body forms a circular cylinder in the region of the holding part, on the edge region of which one or more catch elements are formed which form a snap-in connection anchoring this with counter-elements on the supporting body.
  • This type of anchoring of the support body is particularly easy to install and allows low production costs.
  • the locking elements can be offset from the end edge of the outer wall of the holding part and formed by depressions of the outer wall of the holding part, in which a bead-like, radially inwardly projecting projection on the inside of the support body can be snapped.
  • the locking elements on the inner wall of the holding member by an axially remote from the end edge recess and a radially inside projecting, be formed adjacent to the end edge projection which can be latched with counter-elements of distributed over the circumference of the opening of the support body locking fingers.
  • the assembly is particularly simple and convenient.
  • individual locking fingers may be provided at the end edge of the support body.
  • the pressure accumulator comprises a housing, an insert part inserted into the housing, a first subspace arranged between the housing and a flexible separation membrane, and a second subspace arranged between the separation membrane and the support body, wherein the head part adjoins the second part Partial space adjacent, wherein on the holding body, the opening edge of the separation membrane is anchored, wherein the first subspace with a first fluid and the second subspace is filled with a second fluid, and wherein the first and the second subspace by movements of the separation membrane depending on the respective filling state in vary in size.
  • the support body has the shape of a rotating body, which is rounded at the end facing the first compartment and formed closed and provided with at least one lateral wall opening as a passage point between the second and third compartment.
  • the support body for the separation membrane or storage bubble can form a large-area support, so that the memory bubble which is practically free of creases when the pressure is exceeded is optimally protected.
  • the holding body has the shape of a bell whose bell casing surrounds a fourth subspace adjoining the third subspace.
  • the support body is preferably formed from a plastic material.
  • this glass fiber-reinforced polyarylamide IXEF ® a material, which is distinguished over conventional glass fiber reinforced plastics by a smooth, closed outer skin can be provided. Because of these properties, the holding body and / or the connection device can be formed from this material in an advantageous manner.
  • the pressure accumulator is designed as a hydropneumatic bladder accumulator for a gaseous second fluid as a working medium and / or a liquid first fluid as a storage medium.
  • the pressure accumulator for filling a storage medium in the form of a chemically aggressive fluid, such as urea-water solution is formed. This allows use of the pressure accumulator according to the invention in the urea injection, especially in the automotive field.
  • a memory housing is denoted by 2, which has the shape of a large cylindrical pot on the closed bottom 4, a flow opening 6 is located on the whole.
  • the aligned on the central longitudinal axis 10 opening 6 allows the supply and removal of a first fluid, such as a urea-water solution, to or from the first compartment 8, which is located in the housing 2 adjacent to the bottom 4.
  • a head part 12 which can be screwed to the storage housing 2 forms the fluid-tight closure of the upper, open end of the housing 2.
  • the head part 12 has an outer cover part 14 on which the screw connection with the housing 2 is formed and which may consist of a metallic material, for example of aluminum, as may also be the case with the housing 2. Alternatively, the cover part 14 may also be formed from a structurally stable plastic material.
  • the cover part 14 has a central, concentric with the axis 10 opening 16. At a small distance from the opening 16, the cover part 14 inner wall parts in the form of a concentric to the axis 10 spherical cap 18.
  • the head part 12 has a holding body 20, with a integral therewith, the connecting device for the second fluid-forming screw socket 22, which passes through the opening 16 of the cover part 14 and is fixed by means of which in Caribbeanwirküng with a nut 24 of the holding body 20 within the cover part 14.
  • a central fluid channel 26 extends to fill a third subspace 28 with the working medium under bias pressure as the second fluid.
  • a located within the channel 26 valve insert is not shown in the drawing.
  • the holding body 20 has the shape of a bell whose shell surrounds a fourth sub-space 30 which adjoins the third sub-space 28.
  • the bell shell forms on its outer wall spherical surface parts 34 which define a clamping gap 36 for the anchoring region 38 located in the gap 36 of a separation membrane 40 between itself and the cap 18 of the cover part.
  • the bladder formed from a plastic suitable for such pressure accumulators, such as butyl, forms the flexible separating membrane 40 between the first subspace 28 and the second subspace 54.
  • the holding body 20 has an annular groove 42 between the end of the outer spherical surface part 34 and the screw neck 22, into which for particularly secure anchoring of the separation membrane 40 engages an edge rim 44 surrounding its opening edge.
  • the holder body 20 forms with which located within the plane formed by the separating membrane 40 bubble cap, a holding portion 46 for anchorage of a projecting into the interior of the bladder support body 48.
  • This is formed of a sufficiently structurally rigid plastic material, with glass fiber-reinforced polyarylamide IXEF ® to be particularly well has proved suitable.
  • the support body 48 has the shape of a body of revolution with spherical rounded, closed, located at a distance from the bottom 4 of the housing 2 lower end and surrounds adjacent to the fourth subspace 30 third subspace 28.
  • the other, upper end 50 of the support body 48 is fixed to the holding part 46 by means of a snap connection.
  • the support body 48 is approximately V-shaped in longitudinal section and has lateral wall openings 52 for the passage of the working fluid to the second compartment 54, which adjoins the third compartment 28.
  • FIGS. 2 and 3 The details of the insert for a pressure accumulator are the clearest FIGS. 2 and 3 removable.
  • recesses 56 and 60 are formed at a small distance from the end edge 56 of the holding member, in which the end portion of the support body 48 is receivable, wherein a radially inwardly projecting projection 62 of the support body 48 can be snapped into the recess 60.
  • the holding body 20 is formed in the present example, as well as the support body 48 and located in the channel 26 of the nozzle 22 valve made of glass fiber reinforced polyarylamide IXEF ® , so that the insert part comprising the holding body 20 with the support body 48 fixed thereto a completely made of plastic unit forms.
  • the first subspace 8 of the pressure accumulator is filled by means of a pump with the urea-water solution until an upper value of the system pressure is reached and the pump shuts off.
  • the accumulator pressure forces the metered injection storage medium into the system.
  • the pump switches on again. If it should come to unwanted pressure excesses and a certain limit of the volume increase of the first subspace 8 is exceeded, the separation membrane 40 applies to the support body 48 and is thereby protected against overloading and damage.
  • the Fig. 4 shows a variant of the design of the insert part, wherein the locking elements now on the inner wall of the holding part 46 of the holding body 20 are arranged. As Fig. 4 shows, it is a recess 64 axially remote from the end edge 56 and a radially inwardly projecting, adjoining the end edge 56 projection 66.
  • the counter-elements on the part of the support body 48 are formed by retaining fingers 68 which extend beyond the circumference of the opening Support body 48 are arranged distributed. When formed by individual locking fingers 68 counter elements, the preparation of the locking designed particularly simple and convenient.
  • the counter-elements of the support body 48 may also be formed of individual, circumferentially distributed locking fingers.

Description

Die Erfindung betrifft einen Druckspeicher umfassend ein Gehäuse, einen zwischen dem Gehäuse und einer flexiblen Trennmembran angeordneten ersten Teilraum, einen zwischen der Trennmembran und einem Stützkörper angeordneten zweiten Teilraum, und ein an den zweiten Teilraum angrenzendes, den Verschluss des Gehäuses bildendes Kopfteil, wobei der erste Teilraum mit einem ersten Fluid und der zweite Teilraum mit einem zweiten Fluid befüllbar ist, wobei der erste und der zweite Teilraum durch Bewegungen der Trennmembran in Abhängigkeit vom jeweiligen Befüllungszustand in ihrer jeweiligen Größe variieren, und wobei am Kopfteil ein Haltekörper vorgesehen ist, an dem der Öffnungsrand der Trennmembran verankerbar ist.The invention relates to a pressure accumulator comprising a housing, a arranged between the housing and a flexible separation membrane first subspace, arranged between the separation membrane and a support body second subspace, and adjacent to the second subspace, the closure of the housing forming the head part, wherein the first Partial space with a first fluid and the second subspace with a second fluid can be filled, wherein the first and the second subspace vary by movements of the separation membrane depending on the respective filling state in their respective size, and wherein on the head part, a holding body is provided on which the Opening edge of the separation membrane is anchored.

Ein derartiger Druckspeicher ist aus DE 101 13 415 A1 bekannt. Bei dem bekannten Druckspeicher in Form eines hydropneumatischen Druckspeichers ist ein flexibles Trennelement in einem Speichergehäuse, gebildet durch ein Rohrendstück, angeordnet und umgibt einen Fluiddurchlässe aufweisenden Stützkörper. Der Stützkörper weist zumindest abschnittsweise eine unrunde Querschnittsform auf. Das Trennelement ist unter Bildung einer Abdichtung am Speichergehäuse so verankert, dass an Außen- und Innenseite des Trennelements jeweils voneinander getrennte Aufnahmeräume gebildet werden. Eine zentral gelegene, durchgehende Bohrung bildet einen zum inneren Aufnahmeraum des Speichers führenden Durchlass für ein Speichermedium. Zum Befüllen des außenseitigen Gasraumes ist ein Gasventil vorgesehen. Der bekannte Druckspeicher kann zur Energiespeicherung, beispielsweise in Verbindung mit Fahrzeugfederungen, oder auch als Pulsationsdämpfer eingesetzt werden. Des Weiteren eignet sich die bekannte Lösung besonders für die Dämpfung von Druckspitzen in hydraulischen oder sonstigen fluidtechnischen Systemen. Für eine Verwendung als Druckspeicher für Speichermedien in Form chemisch aggressiver Fluide, wie Harnstoff-Wasser-Lösung, lässt die bekannte Lösung noch Wünsche offen.Such an accumulator is off DE 101 13 415 A1 known. In the known pressure accumulator in the form of a hydropneumatic pressure accumulator, a flexible separating element is arranged in a storage housing, formed by a pipe end piece, and surrounds a support body having fluid passages. The support body has at least sections on a non-circular cross-sectional shape. The separating element is anchored to form a seal on the storage housing so that each separate receiving spaces are formed on the outside and inside of the separating element. A centrally located, through bore forms a passage leading to the internal receiving space of the storage for a storage medium. For filling the outside gas space, a gas valve is provided. The known pressure accumulator can be used for energy storage, for example in conjunction with vehicle suspensions, or as a pulsation damper. Furthermore, the known solution is particularly suitable for damping pressure peaks in hydraulic or other fluid power systems. For use as an accumulator for storage media in the form of chemically aggressive fluids, such as urea-water solution, the known solution leaves nothing to be desired.

Ein weiterer Druckspeicher ist aus DE 38 10 509 C2 bekannt. Bekannt ist ein Druckspeicher, umfassend einen Behälterhauptkörper mit einem äußeren Rohr zylindrischer Gestalt, an dessen einem Ende eine Seitenplatte und an dessen anderem Ende ein Deckel angeordnet ist, wenigstens eine Einlassöffnung und eine Auslassöffnung, welche am äußeren Rohr gebildet sind, und eine Blase bzw. Membran zum Unterteilen des Inneren des Behälterhauptkörpers in eine Gaskammer und eine Flüssigkeitskammer, wobei eine Öffnung der Blase durch den Deckel dicht verschlossen ist. Ein Einsatz ist derart angeordnet, dass er in die Blase für den Zweck vorragt, dass das Volumen der Gaskammer verringert wird. Der Einsatz ist aus einem Fußteil, einem mittleren Teil und einem Kopfteil gebildet, wobei das Kopfteil mit dem Boden der Membran in Berührung gehalten ist, was es ermöglicht, eine Beschädigung der Membran durch wiederholtes Zusammenziehen zu verhindern. Im zusammengezogenen Zustand liegt die Blase bzw. Membran am Einsatz an.Another accumulator is off DE 38 10 509 C2 known. A pressure accumulator is known, comprising a container main body with an outer tube of cylindrical shape, at one end of a side plate and at the other end a lid is arranged, at least one inlet opening and an outlet opening, which are formed on the outer tube, and a bladder or A membrane for dividing the interior of the container main body into a gas chamber and a liquid chamber, wherein an opening of the bubble is sealed by the lid. An insert is arranged to project into the bladder for the purpose of reducing the volume of the gas chamber. The insert is formed of a foot part, a middle part and a head part, wherein the head part is kept in contact with the bottom of the membrane, which makes it possible to prevent damage to the membrane by repeated contraction. In the contracted state, the bladder or membrane rests against the insert.

Die GB 877 800 A beschreibt eine Vorrichtung zur Dämpfung von Druckimpulsen in Fluidleitungen mit einem kugelförmigen Gehäuse, in dem eine flexible Trennmembran zwischen einem ersten Teilraum und einem zweiten Teilraum angeordnet ist. In dem ersten Teilraum befindet sich das zu dämpfende Fluid. Der erste Teilraum ist zwischen dem Gehäuse und der Trennmembran angeordnet. Der zweite Teilraum befindet sich zwischen der Trennmembran und einem kugelförmigen Stützkörper. Der von der Trennmembran umschlossene, zweite Teilraum ist mit einem unter Druck stehenden Gas gefüllt. Das Gehäuse ist zweiteilig gebildet und weist ein Kopfteil auf, an dem ein Haltekörper angeordnet ist, an dem ein Öffnungsrand der Trennmembran verankerbar ist. Hierzu weist das Kopfteil ein mit dem Gehäuse verbindbares Deckelteil mit Innenwandteilen in Form einer zur Achse des Gehäuses konzentrischen Kugelkalotte auf.The GB 877,800 A describes a device for damping pressure pulses in fluid lines with a spherical housing, in which a flexible separation membrane between a first subspace and a second subspace is arranged. In the first subspace is the fluid to be damped. The first subspace is between the housing and the Separating membrane arranged. The second compartment is located between the separation membrane and a spherical support body. The second compartment enclosed by the separation membrane is filled with a pressurized gas. The housing is formed in two parts and has a head part, on which a holding body is arranged, on which an opening edge of the separating membrane can be anchored. For this purpose, the head part on a connectable to the housing cover part with inner wall parts in the form of a concentric to the axis of the housing spherical cap.

Druckspeicher dieser Art finden in unterschiedlichen Baugrößen und baulichen Gestaltungen verbreitet Anwendung, um veränderliche Volumina betreffender Fluide, die unter dem Betriebsdruck eines an der Fluidseite angeschlossenen Fluidsystemes stehen, aufzunehmen und abzugeben, wobei die auf ihrer Gasseite unter einem Vorspanndruck des Arbeitsgases stehende Blase ein Druckpolster bildet. Die Betriebssicherheit der Druckspeicher hängt in erster Linie von der üblicherweise aus einem Kunststoffmaterial, insbesondere Butyl, bestehenden Speicherblase ab, die im Betrieb nicht nur mechanischen Beanspruchungen ausgesetzt ist, sondern gegebenenfalls auch gegen chemisch aggressive Speicherfluide widerstandsfähig sein soll. Wie sich gezeigt hat, ist es in Verbindung mit aggressiven Fluiden, wie Harnstoff-Wasser-Lösungen, bislang nicht möglich, eine störungsfreie Lebensdauer ausreichender Länge bei Dauerbetrieb, beispielsweise über 20.000 Stunden, zu gewährleisten.Pressure accumulators of this type are widely used in various sizes and structural designs to receive and deliver varying volumes of subject fluids that are under the operating pressure of a fluid system connected to the fluid side, with the bladder on its gas side under a biasing pressure of the working gas forming a pressure pad , The reliability of the pressure accumulator depends primarily on the usually made of a plastic material, especially butyl, existing from memory bladder, which is not only exposed to mechanical stresses in operation, but should also be resistant to chemically aggressive storage fluids. As has been shown, it is not yet possible in connection with aggressive fluids, such as urea-water solutions, to ensure a trouble-free life of sufficient length during continuous operation, for example over 20,000 hours.

Die sogenannte "Harnstoffeinspritzung" kommt in zunehmendem Maße in der Fahrzeugtechnik zur Anwendung, um durch Einspritzen in den Abgasstrom von Verbrennungsmotoren die Stickoxyd (NOx)-Emissionen zu verringern. Bei derartiger Anwendung ist es besonders wesentlich, dass eine lange Betriebslebensdauer im Dauerbetrieb störungsfrei erreichbar ist.The so-called "urea injection" is increasingly being used in automotive engineering to reduce nitrogen oxide (NOx) emissions by injecting it into the exhaust gas stream from internal combustion engines. In such an application, it is particularly important that a long service life in continuous operation is achievable trouble-free.

Im Hinblick hierauf stellt sich die Erfindung die Aufgabe, einen Druckspeicher zur Verfügung zu stellen, der sich insbesondere in Verbindung mit aggressiven Speichermedien durch eine verbesserte Betriebssicherheit und eine einfache Montage auszeichnet.In this regard, the invention has the object to provide a pressure accumulator available, which is characterized in particular in connection with aggressive storage media by improved reliability and ease of installation.

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

Nach dem kennzeichnenden Teil des Anspruches 1 besteht eine wesentliche Besonderheit der Erfindung darin, dass innerhalb des Deckelteiles der Haltekörper derart angeordnet ist, dass zwischen dessen Außenwand in Form von Kugelflächenteilen und den Innenwandteilen des Deckelteiles ein Spalt für die Aufnahme eines an den Öffnungsrand angrenzenden Randbereiches der Trennmembran gebildet ist.According to the characterizing part of claim 1, a significant feature of the invention is that within the cover part of the holding body is arranged such that between the outer wall in the form of spherical surface parts and the inner wall parts of the lid part, a gap for receiving a bordering on the edge of the opening edge region Separating membrane is formed.

Typischerweise weist das Gehäuse ein an den zweiten Teilraum angrenzendes, den Verschluss des Gehäuses bildendes Kopfteil auf. Das Gehäuse ist zweckmäßigerweise topfförmig ausgebildet, wobei der erste Teilraum bodenseitig angeordnet ist. Im Kopfteil kann eine Anschlusseinrichtung für das zweite Fluid vorgesehen sein.The housing typically has a head part which adjoins the second subspace and forms the closure of the housing. The housing is expediently cup-shaped, wherein the first compartment is arranged on the bottom side. In the head part, a connection device for the second fluid can be provided.

Eine besonders sichere Verankerung der Trennmembran lässt sich erreichen, wenn der Haltekörper in einem von seinem Halteteil in Richtung auf die Anschlusseinrichtung axial versetzten Bereich eine in die Außenwand eingearbeitete Ringnut aufweist, in die für die Verankerung der Trennmembran ein deren Öffnungsrand umgebender Randwulst eingreift.A particularly secure anchoring of the separating membrane can be achieved if the holding body has, in an axially offset from its holding part in the direction of the connection means a machined into the outer wall annular groove in the anchoring of the separation membrane engages a peripheral edge surrounding the edge bead.

Bei besonders vorteilhaften Ausführungsbeispielen weist die Anschlusseinrichtung einen Schraubstutzen auf, der eine zur zentralen Achse konzentrische Öffnung des Deckelteiles durchgreift und der durch Verschrauben mit dem Deckelteil den Haltekörper gegen die Innenwand des Deckelteiles zieht und den im Spalt befindlichen Randbereich der Trennmembran klemmt.In particularly advantageous embodiments, the connection device has a screw socket, which engages through an opening concentric to the central axis of the cover part and the by screwing with the cover part, the holding body against the inner wall of the cover part pulls and clamped the located in the gap edge region of the separation membrane.

Die Erfindung umfasst weiter ein Einsatzteil für einen Druckspeicher umfassend ein den Verschluss eines Gehäuses bildendes Kopfteil, an welchem ein Haltekörper zur Verankerung des Öffnungsrands einer Trennmembran vorgesehen ist, und einen Stützkörper für eine Anlage der Trennmembran, wobei der Haltekörper ein Halteteil bildet, an welchem der Stützkörper angeordnet ist, welches dadurch gekennzeichnet ist, dass der Haltekörper im Bereich des Halteteiles einen Kreiszylinder bildet, an dessen Randbereich ein oder mehrere Rastelemente ausgebildet sind, die mit Gegenelementen am Stützkörper eine diesen verankernde Schnappverbindung bilden.The invention further comprises an insert part for a pressure accumulator comprising a head part forming the closure of a housing, on which a holding body for anchoring the opening edge of a separating membrane is provided, and a supporting body for abutment of the separating membrane, wherein the holding body forms a holding part, on which the Support body is arranged, which is characterized in that the holding body in the region of the holding part forms a circular cylinder, at the edge region of which one or more latching elements are formed, which form with mating elements on the support body an anchoring this snap connection.

Erfindungsgemäß ist die Anordnung so getroffen sein, dass der Haltekörper im Bereich des Halteteiles einen Kreiszylinder bildet, an dessen Randbereich ein oder mehrere Rastelemente ausgebildet sind, die mit Gegenelementen am Stützkörper eine diesen verankernde Schnappverbindung bilden. Diese Art der Verankerung des Stützkörpers ist besonders montagefreundlich und ermöglicht niedrige Herstellungskosten.According to the invention, the arrangement is made such that the holding body forms a circular cylinder in the region of the holding part, on the edge region of which one or more catch elements are formed which form a snap-in connection anchoring this with counter-elements on the supporting body. This type of anchoring of the support body is particularly easy to install and allows low production costs.

Vorteilhafte Ausgestaltungen des erfindungsgemäßen Einsatzteils sind Gegenstände der entsprechenden abhängigen Patentansprüche.Advantageous embodiments of the insert part according to the invention are objects of the corresponding dependent claims.

Die Rastelemente können an der Außenwand des Halteteiles von dessen Endrand versetzt und durch Vertiefungen der Außenwand des Halteteiles gebildet sein, in die ein wulstartiger, radial nach innen ragender Vorsprung an der Innenseite des Stützkörpers einschnappbar ist.The locking elements can be offset from the end edge of the outer wall of the holding part and formed by depressions of the outer wall of the holding part, in which a bead-like, radially inwardly projecting projection on the inside of the support body can be snapped.

Alternativ können die Rastelemente an der Innenwand des Halteteiles durch eine von deren Endrand axial entfernte Vertiefung und einen radial nach innen ragenden, sich an den Endrand anschließenden Vorsprung gebildet sein, die mit Gegenelementen von über den Umfang der Öffnung des Stützkörpers verteilten Rastfingern verrastbar sind. Bei einem derart gebildeten Kranz aus einzelnen Rastfingern gestaltet sich die Montage besonders einfach und bequem. Entsprechendes gilt für Ausführungsbeispiele, bei denen die Verrastung an der Außenseite des Halteteiles erfolgt. Auch in diesem Falle können am Endrand des Stützkörpers einzelne Rastfinger vorgesehen sein.Alternatively, the locking elements on the inner wall of the holding member by an axially remote from the end edge recess and a radially inside projecting, be formed adjacent to the end edge projection which can be latched with counter-elements of distributed over the circumference of the opening of the support body locking fingers. In a ring of individual detent fingers thus formed, the assembly is particularly simple and convenient. The same applies to embodiments in which the latching takes place on the outside of the holding part. Also in this case, individual locking fingers may be provided at the end edge of the support body.

In einer besonderen Ausführungsform weist der erfindungsgemäße Druckspeicher ein Gehäuse, ein in das Gehäuse eingesetztes erfindungsgemäßes Einsatzteil, einen zwischen dem Gehäuse und einer flexiblen Trennmembran angeordneten ersten Teilraum, und einen zwischen der Trennmembran und dem Stützkörper angeordneten zweiten Teilraum auf, wobei das Kopfteil an den zweiten Teilraum angrenzt, wobei am Haltekörper der Öffnungsrand der Trennmembran verankert ist, wobei der erste Teilraum mit einem ersten Fluid und der zweite Teilraum mit einem zweiten Fluid befüllbar ist, und wobei der erste und der zweite Teilraum durch Bewegungen der Trennmembran in Abhängigkeit vom jeweiligen Befüllungszustand in ihrer jeweiligen Größe variieren.In a particular embodiment, the pressure accumulator according to the invention comprises a housing, an insert part inserted into the housing, a first subspace arranged between the housing and a flexible separation membrane, and a second subspace arranged between the separation membrane and the support body, wherein the head part adjoins the second part Partial space adjacent, wherein on the holding body, the opening edge of the separation membrane is anchored, wherein the first subspace with a first fluid and the second subspace is filled with a second fluid, and wherein the first and the second subspace by movements of the separation membrane depending on the respective filling state in vary in size.

Bei besonders vorteilhaften Ausführungsbeispielen hat der Stützkörper die Form eines Rotationskörpers, der an dem dem ersten Teilraum zugewandten Ende gerundet und geschlossen ausgebildet sowie mit mindestens einem seitlichen Wanddurchbruch als Durchtrittsstelle zwischen zweitem und drittem Teilraum versehen ist. Bei solcher Gestaltung kann der Stützkörper für die Trennmembran bzw. Speicherblase eine großflächige Abstützung bilden, so dass die bei Drucküberschreitung praktisch faltenfrei anliegende Speicherblase optimal geschützt ist.In particularly advantageous embodiments of the support body has the shape of a rotating body, which is rounded at the end facing the first compartment and formed closed and provided with at least one lateral wall opening as a passage point between the second and third compartment. In such a design, the support body for the separation membrane or storage bubble can form a large-area support, so that the memory bubble which is practically free of creases when the pressure is exceeded is optimally protected.

Bei einer besonderen Ausgestaltung des erfindungsgemäßen Druckspeichers weist der Haltekörper die Gestalt einer Glocke auf, deren Glockenmantel einen an den dritten Teilraum angrenzenden vierten Teilraum umgibt. Auf diese Weise wird die Aufnahmekapazität des Druckspeichers für das zweite Fluid bzw. das typischerweise gasförmige Arbeitsmedium vergrößert und zugleich der Materialbedarf zur Ausbildung des Druckspeichers verringert.In a particular embodiment of the pressure accumulator according to the invention, the holding body has the shape of a bell whose bell casing surrounds a fourth subspace adjoining the third subspace. In this way, the absorption capacity of the pressure accumulator for the second fluid or the typically gaseous working medium is increased and at the same time reduces the material requirement for the formation of the pressure accumulator.

Der Stützkörper ist vorzugsweise aus einem Kunststoffwerkstoff gebildet. Mit besonderem Vorteil kann hierbei glasfaserverstärktes Polyarylamid IXEF® vorgesehen sein, ein Werkstoff, der sich gegenüber üblichen glasfaserverstärkten Kunststoffen durch eine glatte, geschlossene Außenhaut auszeichnet. Aufgrund dieser Eigenschaften können in vorteilhafter Weise auch der Haltekörper und/oder die Anschlusseinrichtung aus diesem Werkstoff gebildet sein.The support body is preferably formed from a plastic material. With particular advantage this glass fiber-reinforced polyarylamide IXEF ®, a material, which is distinguished over conventional glass fiber reinforced plastics by a smooth, closed outer skin can be provided. Because of these properties, the holding body and / or the connection device can be formed from this material in an advantageous manner.

Vorteilhafterweise ist der Druckspeicher als hydropneumatischer Blasenspeicher für ein gasförmiges zweites Fluid als Arbeitsmedium und/oder ein flüssiges erstes Fluid als Speichermedium ausgebildet. Besonders bevorzugt ist der Druckspeicher zur Befüllung eines Speichermediums in Form eines chemisch aggressiven Fluids, wie Harnstoff-Wasser-Lösung, ausgebildet. Dies ermöglicht einen Einsatz des erfindungsgemäßen Druckspeichers bei der Harnstoffeinspritzung insbesondere im Kraftfahrzeugbereich.Advantageously, the pressure accumulator is designed as a hydropneumatic bladder accumulator for a gaseous second fluid as a working medium and / or a liquid first fluid as a storage medium. Particularly preferably, the pressure accumulator for filling a storage medium in the form of a chemically aggressive fluid, such as urea-water solution is formed. This allows use of the pressure accumulator according to the invention in the urea injection, especially in the automotive field.

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

Fig. 1
einen gegenüber einer praktischen Ausführungsform lediglich geringfügig vergrößert dargestellten Längsschnitt eines Ausführungsbeispieles des erfindungsgemäßen Druckspeichers;
Fig. 2
einen Längsschnitt eines erfindungsgemäßen Einsatzteils umfassend einen Haltekörper mit daran festgelegtem Stützkörper;
Fig. 3
einen gegenüber Fig. 2 stark vergrößerten Ausschnitt des in Fig. 2 mit III bezeichneten Bezirks; und
Fig. 4
einen der Fig. 2 ähnlichen Längsschnitt, in dem ein abgewandeltes Beispiel der erfindungsgemäßen Verrastung des Stützkörpers am Haltekörper dargestellt ist.
The invention is explained in detail below with reference to the drawing. Show it:
Fig. 1
a comparison with a practical embodiment only slightly enlarged illustrated longitudinal section of an embodiment of the pressure accumulator according to the invention;
Fig. 2
a longitudinal section of an insert part according to the invention comprising a holding body with fixed thereto supporting body;
Fig. 3
one opposite Fig. 2 greatly enlarged section of the in Fig. 2 District designated III; and
Fig. 4
one of the Fig. 2 similar longitudinal section, in which a modified example of the latching of the support body according to the invention is shown on the holding body.

Nachstehend ist die Erfindung anhand des Beispieles der Benutzung des Druckspeichers für ein System der Harnstoffeinspritzung erläutert. In Fig. 1, die das Ausführungsbeispiel des Druckspeichers in Gänze zeigt, ist ein Speichergehäuse mit 2 bezeichnet, das im großen Ganzen die Form eines kreiszylindrischen Topfes besitzt, an dessen geschlossenem Boden 4 sich eine Durchflussöffnung 6 befindet. Die auf die zentrale Längsachse 10 ausgerichtete Öffnung 6 ermöglicht die Zufuhr und Abfuhr eines ersten Fluids, wie einer Harnstoff-Wasser-Lösung, zu dem bzw. aus dem ersten Teilraum 8, der sich im Gehäuse 2 angrenzend an dem Boden 4 befindet. Ein mit dem Speichergehäuse 2 verschraubbares Kopfteil 12 bildet den fluiddichten Verschluss des oberen, offenen Endes des Gehäuses 2.The invention will be explained below with reference to the example of the use of the pressure accumulator for a system of urea injection. In Fig. 1 , which shows the embodiment of the pressure accumulator in its entirety, a memory housing is denoted by 2, which has the shape of a large cylindrical pot on the closed bottom 4, a flow opening 6 is located on the whole. The aligned on the central longitudinal axis 10 opening 6 allows the supply and removal of a first fluid, such as a urea-water solution, to or from the first compartment 8, which is located in the housing 2 adjacent to the bottom 4. A head part 12 which can be screwed to the storage housing 2 forms the fluid-tight closure of the upper, open end of the housing 2.

Das Kopfteil 12 weist ein äußeres Deckelteil 14 auf, an dem die Verschraubung mit dem Gehäuse 2 ausgebildet ist und das aus einem metallischen Werkstoff, beispielsweise aus Aluminium bestehen kann, wie dies auch bei dem Gehäuse 2 der Fall sein kann. Alternativ kann das Deckelteil 14 auch aus einem strukturfesten Kunststoffmaterial gebildet sein. Das Deckelteil 14 weist eine zentrale, zur Achse 10 konzentrische Öffnung 16 auf. In geringem Abstand von der Öffnung 16 weist das Deckelteil 14 Innenwandteile in Form einer zur Achse 10 konzentrischen Kugelkalotte 18 auf. Innerhalb des Deckelteiles 14 weist das Kopfteil 12 einen Haltekörper 20 auf, mit einem daran einstückig befindlichen, die Anschlusseinrichtung für das zweite Fluid bildenden Schraubstutzen 22, der die Öffnung 16 des Deckelteiles 14 durchgreift und mittels dem in Zusammenwirküng mit einer Mutter 24 der Haltekörper 20 innerhalb des Deckelteiles 14 festgelegt ist. Durch den Schraubstutzen 22 erstreckt sich ein zentraler Fluidkanal 26, um einen dritten Teilraum 28 mit dem unter Vorspanndruck stehenden Arbeitsmedium als zweites Fluid zu befüllen. Ein innerhalb des Kanales 26 befindlicher Ventileinsatz ist in der Zeichnung nicht dargestellt.The head part 12 has an outer cover part 14 on which the screw connection with the housing 2 is formed and which may consist of a metallic material, for example of aluminum, as may also be the case with the housing 2. Alternatively, the cover part 14 may also be formed from a structurally stable plastic material. The cover part 14 has a central, concentric with the axis 10 opening 16. At a small distance from the opening 16, the cover part 14 inner wall parts in the form of a concentric to the axis 10 spherical cap 18. Within the cover part 14, the head part 12 has a holding body 20, with a integral therewith, the connecting device for the second fluid-forming screw socket 22, which passes through the opening 16 of the cover part 14 and is fixed by means of which in Zusammenwirküng with a nut 24 of the holding body 20 within the cover part 14. Through the screw neck 22, a central fluid channel 26 extends to fill a third subspace 28 with the working medium under bias pressure as the second fluid. A located within the channel 26 valve insert is not shown in the drawing.

Der Haltekörper 20 hat die Gestalt einer Glocke, deren Mantel einen vierten Teilraum 30 umgibt, der an den dritten Teilraums 28 angrenzt. Der Glockenmantel bildet an seiner Außenwand Kugelflächenteile 34, die zwischen sich und der Kalotte 18 des Deckelteiles 14 einen Klemmspalt 36 für den im Spalt 36 befindlichen Verankerungsbereich 38 einer Trennmembran 40 definieren. Die aus einem für derartige Druckspeicher geeigneten Kunststoff, wie Butyl, gebildete Blase bildet die flexible Trennmembran 40 zwischen erstem Teilraum 28 und zweitem Teilraum 54. Der Haltekörper 20 weist zwischen dem Ende des äußeren Kugelflächenteiles 34 und dem Schraubstutzen 22 eine Ringnut 42 auf, in die zur besonders sicheren Verankerung der Trennmembran 40 ein deren Öffnungsrand umgebender Randwulst 44 eingreift.The holding body 20 has the shape of a bell whose shell surrounds a fourth sub-space 30 which adjoins the third sub-space 28. The bell shell forms on its outer wall spherical surface parts 34 which define a clamping gap 36 for the anchoring region 38 located in the gap 36 of a separation membrane 40 between itself and the cap 18 of the cover part. The bladder formed from a plastic suitable for such pressure accumulators, such as butyl, forms the flexible separating membrane 40 between the first subspace 28 and the second subspace 54. The holding body 20 has an annular groove 42 between the end of the outer spherical surface part 34 and the screw neck 22, into which for particularly secure anchoring of the separation membrane 40 engages an edge rim 44 surrounding its opening edge.

Der Haltekörper 20 bildet mit der sich innerhalb der durch die Trennmembran 40 gebildeten Blase befindlichen Glocke ein Halteteil 46 für die Verankerung eines ins Innere der Blase ragenden Stützkörpers 48. Dieser ist aus einem ausreichend strukturfesten Kunststoffmaterial gebildet, wobei sich glasfaserverstärktes Polyarylamid IXEF® als besonders gut geeignet erwiesen hat. Wie aus Fig. 1 ersichtlich, hat der Stützkörper 48 die Form eines Rotationskörpers mit kugelig gerundetem, geschlossenem, im Abstand vom Boden 4 des Gehäuses 2 befindlichem unteren Ende und umgibt einen an den vierten Teilraum 30 angrenzenden dritten Teilraum 28. Das andere, obere Ende 50 des Stützkörpers 48 ist am Halteteil 46 mittels einer Schnappverbindung festgelegt. Wie Fig. 1 außerdem zeigt, ist der Stützkörper 48 im Längsschnitt etwa V-förmig und weist seitliche Wanddurchbrüche 52 für den Durchtritt des Arbeitsfluids zum zweiten Teilraum 54 auf, der an den dritten Teilraum 28 angrenzt.The holder body 20 forms with which located within the plane formed by the separating membrane 40 bubble cap, a holding portion 46 for anchorage of a projecting into the interior of the bladder support body 48. This is formed of a sufficiently structurally rigid plastic material, with glass fiber-reinforced polyarylamide IXEF ® to be particularly well has proved suitable. How out Fig. 1 can be seen, the support body 48 has the shape of a body of revolution with spherical rounded, closed, located at a distance from the bottom 4 of the housing 2 lower end and surrounds adjacent to the fourth subspace 30 third subspace 28. The other, upper end 50 of the support body 48 is fixed to the holding part 46 by means of a snap connection. As Fig. 1 In addition, the support body 48 is approximately V-shaped in longitudinal section and has lateral wall openings 52 for the passage of the working fluid to the second compartment 54, which adjoins the third compartment 28.

Die Einzelheiten des Einsatzteils für einen Druckspeicher sind am deutlichsten den Figuren 2 und 3 entnehmbar. Wie ersichtlich sind in geringem Abstand vom Endrand 56 des Halteteiles 46 Vertiefungen 56 und 60 gebildet, in denen der Endbereich des Stützkörpers 48 aufnehmbar ist, wobei ein radial nach innen ragender Vorsprung 62 des Stützkörpers 48 in die Vertiefung 60 einschnappbar ist. Der Haltekörper 20 ist beim vorliegenden Beispiel, ebenso wie der Stützkörper 48 und das im Kanal 26 des Stutzens 22 befindliche Ventil aus glasfaserverstärktem Polyarylamid IXEF® gebildet, so dass das Einsatzteil umfassend den Haltekörper 20 mit dem daran festgelegtem Stützkörper 48 eine vollständig aus Kunststoff bestehende Einheit bildet.The details of the insert for a pressure accumulator are the clearest FIGS. 2 and 3 removable. As can be seen 46 recesses 56 and 60 are formed at a small distance from the end edge 56 of the holding member, in which the end portion of the support body 48 is receivable, wherein a radially inwardly projecting projection 62 of the support body 48 can be snapped into the recess 60. The holding body 20 is formed in the present example, as well as the support body 48 and located in the channel 26 of the nozzle 22 valve made of glass fiber reinforced polyarylamide IXEF ® , so that the insert part comprising the holding body 20 with the support body 48 fixed thereto a completely made of plastic unit forms.

Im Betrieb wird bei einer Benutzung für die Harnstoffeinspritzung der erste Teilraum 8 des Druckspeichers mittels einer Pumpe mit der HarnstoffWasser-Lösung befüllt, bis ein oberer Wert des Systemdruckes erreicht ist und die Pumpe abschaltet. Durch den Speicherdruck wird das Speichermedium für die dosierte Einspritzung in das System gedrückt. Bei Erreichen eines unteren Druckwertes schaltet die Pumpe wieder ein. Wenn es zu ungewollten Drucküberschreitungen kommen sollte und ein bestimmter Grenzwert der Volumenzunahme des ersten Teilraums 8 überschritten ist, legt sich die Trennmembran 40 an den Stützkörper 48 an und wird dadurch gegen Überlastung und Beschädigung geschützt.In operation, when used for the urea injection, the first subspace 8 of the pressure accumulator is filled by means of a pump with the urea-water solution until an upper value of the system pressure is reached and the pump shuts off. The accumulator pressure forces the metered injection storage medium into the system. When a lower pressure value is reached, the pump switches on again. If it should come to unwanted pressure excesses and a certain limit of the volume increase of the first subspace 8 is exceeded, the separation membrane 40 applies to the support body 48 and is thereby protected against overloading and damage.

Die Fig. 4 zeigt eine Variante der Gestaltung des Einsatzteils, wobei die Rastelemente nunmehr an der Innenwand des Halteteiles 46 des Haltekörpers 20 angeordnet sind. Wie Fig. 4 zeigt, handelt es sich dabei um eine vom Endrand 56 axial entfernte Vertiefung 64 und einen radial nach innen ragenden, sich an den Endrand 56 anschließenden Vorsprung 66. Die Gegenelemente seitens des Stützkörpers 48 sind durch Haltefinger 68 gebildet, die über den Umfang der Öffnung des Stützkörpers 48 verteilt angeordnet sind. Bei durch einzelne Rastfinger 68 gebildeten Gegenelementen gestaltet sich die Herstellung der Verrastung besonders einfach und bequem.The Fig. 4 shows a variant of the design of the insert part, wherein the locking elements now on the inner wall of the holding part 46 of the holding body 20 are arranged. As Fig. 4 shows, it is a recess 64 axially remote from the end edge 56 and a radially inwardly projecting, adjoining the end edge 56 projection 66. The counter-elements on the part of the support body 48 are formed by retaining fingers 68 which extend beyond the circumference of the opening Support body 48 are arranged distributed. When formed by individual locking fingers 68 counter elements, the preparation of the locking designed particularly simple and convenient.

Auch bei der in Figuren 2 und 3 gezeigten Ausführungsform der Verrastung an der Außenseite des Halteteiles 46 des Haltekörpers 20 könnten die Gegenelemente des Stützkörpers 48 auch aus einzelnen, umfänglich verteilten Rastfingern gebildet sein.Also at the in FIGS. 2 and 3 shown embodiment of the latching on the outside of the holding member 46 of the holding body 20, the counter-elements of the support body 48 may also be formed of individual, circumferentially distributed locking fingers.

Claims (15)

  1. A pressure accumulator comprising
    - a housing (2),
    - a first compartment (8) disposed between the housing (2) and a flexible separating diaphragm (40),
    - a second compartment (54) disposed between the separating diaphragm (40) and a support body (48), and
    - a head part (12) which forms the closure of the housing (2) and which borders the second compartment (54),
    the first compartment (8) being fillable with a first fluid and the second compartment (54) being fillable with a second fluid,
    the first and the second compartment (8, 54) varying in their respective size as a result of movements of the separating diaphragm (40) as a function of the respective filling state, and
    there being provided on the head part (12) a retaining body (20) to which the opening edge of the separating diaphragm (40) can be anchored,
    and the head part (12) having a cover part (14) that can be connected to the housing (2) and with inside wall parts in the form of a spherical cap (18) which is concentric to the axis (10) of the housing (2), characterised in that within the cover part (14) the retaining body (20) is arranged such that between its outside wall in the form of spherical surface parts (34) and the inside wall parts of the cover part (14) a gap (36) is formed for accommodating an edge region (38) of the separating diaphragm (40) which borders the opening edge.
  2. The pressure accumulator according to Claim 1, characterised in that a connection device (22) is provided for the second fluid in the head part (12).
  3. The pressure accumulator according to Claim 2, characterised in that the retaining body (20) in a region which is axially offset from its retaining part (46) in the direction of the connection device (22) has an annular groove (42) which has been machined into the outside wall and in which an edge bead (44) which surrounds the opening edge of the separating diaphragm engages for the anchoring of the separating diaphragm (40).
  4. The pressure accumulator according to Claim 2 or 3, characterised in that the connection device has a screw fitting (22) which extends through an opening (16) of the cover part (14) which is concentric to the central axis (10), which fitting pulls the retaining body (20) against the inside wall of the cover part (14) by screwing to the cover part (14) and clamps the edge region (38) of the separating diaphragm (40) located in the gap (36).
  5. An insert part for a pressure accumulator, comprising
    - a head part (12) which forms the closure of a housing (2) and on which a retaining body (20) is provided for anchoring the opening edge of a separating diaphragm (40), and
    - a support body (48) for supporting the separating diaphragm (40),
    the retaining body (20) forming a retaining part (46) on which the support body (48) is arranged,
    and the retaining body (20) forming a circular cylinder in the region of the retaining part (46),
    characterised in that there are formed on an edge region of the circular cylinder one or more catch elements (58, 60) which with counter-elements (62) on the support body (48) form a snap connection which anchors the latter.
  6. An insert part according to Claim 5, characterised in that the catch elements on the outer wall of the retaining part (46) are offset from its end edge (56) and are formed by depressions (58, 60) of the outer wall of the retaining part (46) into which a bead-like projection (62) which protrudes radially to the inside can be snapped on the inside of the support body (48).
  7. The insert part according to Claim 5, characterised in that the catch elements on the inside wall of the retaining part (46) are formed by a depression (64) which is axially spaced apart from its end edge (56) and a projection (66) which adjoins the end edge (56) and protrudes radially to the inside, and said catch elements can be latched to counter-elements in the form of catch fingers (68) which are distributed over the periphery of the opening of the support body (48).
  8. The insert part according to any of Claims 5 to 7, characterised in that the support body (48) is formed from plastic, preferably from glass fibre-reinforced polyarylamide IXEF®.
  9. A pressure accumulator comprising
    - a housing (2),
    - an insert part inserted into the housing (2) according to any of Claims 5 to 8,
    - a first compartment (8) disposed between the housing (2) and a flexible separating diaphragm (40), and
    - a second compartment (54) disposed between the separating diaphragm (40) and the support body (48),
    the head part (12) bordering the second compartment (54),
    the opening edge of the separating diaphragm (40) being anchored to the retaining body (20),
    the first compartment (8) being fillable with a first fluid and the second compartment (54) being fillable with a second fluid,
    the first and the second compartment (8, 54) varying in their respective size as a result of movements of the separating diaphragm (40) as a function of the respective filling state.
  10. The pressure accumulator according to any of Claims 1 to 4 and/or 9, characterised in that the support body (48) comprises a third compartment (28) connected to the second compartment (54) such as to convey fluid.
  11. The pressure accumulator according to Claim 10, characterised in that the support body (48) is a body of revolution which is made rounded and closed on the end facing the first compartment (8) and is provided with at least one wall opening (52) as a passage site between the second compartment (54) and the third compartment (28).
  12. The pressure accumulator according to Claim 10 or 11, characterised in that the retaining body (20) has the shape of a bell the jacket of which surrounds a fourth compartment (30) which borders the third compartment (28).
  13. The pressure accumulator according to any of Claims 1 to 4, 9 to 12, characterised in that the retaining body (20) and/or the connection device (22) is formed from plastic, in particular from glass fibre-reinforced polyarylamide IXEF®.
  14. The pressure accumulator according to Claim 1 to 4, 9 to 13, characterised in that the pressure accumulator is made as a hydropneumatic bladder accumulator for a gaseous second fluid as a working medium and/or a liquid first fluid as a storage medium.
  15. The pressure accumulator according to any of Claims 1 to 4, 9 to 14, characterised in that the pressure accumulator is made for filling with a storage medium in the form of a chemically corrosive first fluid such as a urea-water solution.
EP11727121.3A 2010-06-30 2011-06-17 Pressure store and insert part for a pressure store Active EP2588762B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010025627A DE102010025627A1 (en) 2010-06-30 2010-06-30 Hydropneumatic bladder accumulator
PCT/EP2011/002990 WO2012000617A1 (en) 2010-06-30 2011-06-17 Pressure store and insert part for a pressure store

Publications (2)

Publication Number Publication Date
EP2588762A1 EP2588762A1 (en) 2013-05-08
EP2588762B1 true EP2588762B1 (en) 2015-04-15

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ID=44627293

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Application Number Title Priority Date Filing Date
EP11727121.3A Active EP2588762B1 (en) 2010-06-30 2011-06-17 Pressure store and insert part for a pressure store
EP11726353.3A Active EP2588761B1 (en) 2010-06-30 2011-06-17 Pressure store

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11726353.3A Active EP2588761B1 (en) 2010-06-30 2011-06-17 Pressure store

Country Status (4)

Country Link
US (1) US9133859B2 (en)
EP (2) EP2588762B1 (en)
DE (1) DE102010025627A1 (en)
WO (2) WO2012000617A1 (en)

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DE102015010562A1 (en) * 2015-08-12 2017-02-16 Hydac Filtertechnik Gmbh Filter device and filter element
EP4078028A1 (en) 2019-12-20 2022-10-26 L.E.S.S. Ltd Optical waveguide-based side illuminating assembly, elongated reinforcing structure, and receptacle
CN112032454B (en) * 2020-09-21 2022-05-17 北京航空航天大学 Gas-liquid coupling type fluid pulsation vibration damper
CN112555559B (en) * 2020-11-24 2022-04-26 江苏大学 Non-uniform incoming flow suppression device at pump inlet
FR3119211A1 (en) * 2021-01-26 2022-07-29 Dominique JOSSE The present invention relates to a device intended to manage the storage of a fluid under conditions of increased efficiency and/or operational safety.

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Also Published As

Publication number Publication date
US9133859B2 (en) 2015-09-15
EP2588761A1 (en) 2013-05-08
DE102010025627A1 (en) 2012-01-05
WO2012000616A1 (en) 2012-01-05
WO2012000617A1 (en) 2012-01-05
EP2588762A1 (en) 2013-05-08
EP2588761B1 (en) 2014-07-16
US20130126026A1 (en) 2013-05-23

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