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EP3094867A1 - Accumulator device - Google Patents

Accumulator device

Info

Publication number
EP3094867A1
EP3094867A1 EP14816135.9A EP14816135A EP3094867A1 EP 3094867 A1 EP3094867 A1 EP 3094867A1 EP 14816135 A EP14816135 A EP 14816135A EP 3094867 A1 EP3094867 A1 EP 3094867A1
Authority
EP
European Patent Office
Prior art keywords
housing
storage
separating piston
storage device
guide device
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.)
Granted
Application number
EP14816135.9A
Other languages
German (de)
French (fr)
Other versions
EP3094867B1 (en
Inventor
Herbert Baltes
Peter Kloft
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hydac Technology GmbH
Original Assignee
Hydac Technology GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hydac Technology GmbH filed Critical Hydac Technology GmbH
Publication of EP3094867A1 publication Critical patent/EP3094867A1/en
Application granted granted Critical
Publication of EP3094867B1 publication Critical patent/EP3094867B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • 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
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • 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
    • 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
    • F15B2201/60—Assembling or methods for making accumulators
    • F15B2201/605—Assembling or methods for making housings therefor

Definitions

  • the invention relates to a storage device, in particular in the form of a piston accumulator, with a separating piston, which separates two media spaces within a storage housing, in particular a space with a working gas, such as nitrogen, from a space with a working fluid, such as hydraulic oil.
  • a working gas such as nitrogen
  • Memory devices of this type are known in a variety of sizes and embodiments and are available on the market. They are widely used in hydraulic systems of all kinds, for example for the storage of hydraulic energy, for damping or smoothing pressure fluctuations or the like. In many cases, storage devices in the form of piston accumulators are also used in hydraulic systems in working equipment having hydraulic drive units, for example mobile working machines, such as excavators, stackers, loaders or mobile cranes.
  • the invention is based on the object of providing a storage device of the type mentioned in the introduction which is particularly efficient and inexpensive to produce and is also characterized by a particularly favorable operating behavior.
  • an essential feature of the invention is that the separating piston is guided longitudinally within a guide device and that the guide device arranged within the storage housing extends at least partially along its longitudinal axis.
  • a guide device is provided, the storage housing can be rational and manufactured at low cost, because no complex internal machining for direct guidance of the separating piston on the housing inner wall is required.
  • a particular advantage of the invention is that a structurally identical unit, consisting of guide device and associated separating piston, can be used for different memory housing sizes, whereby a modular design can be realized for the production of differently dimensioned memory devices, which allows a particularly efficient production with low cost.
  • the presence of a guide device extending in the storage housing in its longitudinal direction additionally improves the operating behavior by homogenizing the working gas due to reduced turbulence occurring during operation.
  • the longitudinal extent of the guide device can be dimensioned such that it remains in the guide device in every possible displacement position of the separating piston.
  • the guide device may be formed from a hollow cylinder, preferably with a constant wall thickness, which is fixed at its one free end to the inside of the storage housing.
  • a corresponding hollow cylinder, on the wall due to the mobility of the separating piston during operation no pressure difference is effective, can be produced relatively thin-walled cost and attach via a weld on the inside of the housing.
  • the guide device can advantageously be installed in the housing in such a way that the separating piston with parts of the guide device and with the parts of the storage housing on which one end of the hollow cylinder is fixed in a fluid-tight manner limits the media space with the working fluid.
  • the said parts of the storage housing may be part of a housing upper part, in particular in the form of a lid, which follows on its inside at least partially the free, frontal outer contour of the separating piston, which faces the upper housing part. In the absence of pressure of the working fluid, this results in a safe, large-scale system of the separating piston on the housing wall.
  • the end-side outer contour of the separating piston may be convexly shaped in order to come into contact with the concave-shaped inner side of the housing upper part as soon as the separating piston has reached its one end position, wherein the working fluid is completely displaced from the allocatable media space.
  • the storage housing and the guide means are arranged substantially concentric with each other, wherein at least over a central region of the storage housing, the outer side of the guide device maintains a constant distance to the inside of the storage housing.
  • the arrangement may in this case be made such that the guide device opens with its free end in the direction of a bottom part of the storage housing, which is formed as a hemisphere preferably integral part of the cup-shaped housing lower part.
  • the longitudinal extent of the hollow cylinder forming the guide device can be taken with particular advantage such that the guide device ends with its one free end in a transition region in which the cylindrically shaped middle storage housing part merges into the hemispherical bottom part of the housing.
  • the storage housing can be designed with particular advantage such that a weld joint between the upper housing part and the adjoining housing part is covered by the guide device while maintaining a predeterminable radial distance.
  • the guide device thereby forms a protective covering of the weld during the welding process.
  • Fig. 1 is a side view of an embodiment of the memory device according to the invention and Fig. 2 is a longitudinal section corresponding to the section line II - II of
  • the exemplary embodiment illustrated in the figures has a storage housing 2 with a circular-cylindrical housing main part 6, an upper housing part 4 and a bottom part 8.
  • the housing main part 6 and the bottom part 8 form a pot, which is closed except for a longitudinal axis 10 of the coaxially laid gas filling connection 12.
  • Housing main part 6 and bottom part 8 are integrally formed, for example in the form of a deep-drawn part of metallic material, wherein the bottom part 8 has the shape of a hemisphere, which merges in a transition region 14 in the cylindrical housing main part 6.
  • the upper housing part 4 has the shape of a shell with a concave inner side 16 and, as a closure part of the housing 2, is connected to the cylindrical housing main part 6 by means of a weld 18. Concentric with the longitudinal axis 10, a fluid connection 20 for a relevant working fluid, such as hydraulic oil, is provided on the upper housing part 4.
  • the storage device forms a piston accumulator
  • the storage housing 2 is designed in the manner of the housing for a bladder accumulator, ie the housing 2 is without a surface treatment of the inside, as in conventional piston accumulators to form a sliding and guide surface for the respective separating piston is required, in a simple and inexpensive manner to produce, since this function is taken over in the invention for the separating piston 22 by a guide device.
  • This has a hollow cylinder 24 which extends concentrically in the housing 2 to the axis 10 and on the inside forms the guide track for the separating piston 22.
  • the hollow cylinder 24 is fixed fluid-tight with one end on the upper housing part 4 by welding and extends with its an opposite free end to the transition region 14, where the cylindrical housing main part 6 merges into the bottom part 8.
  • the space located above the separating piston 22 in the hollow cylinder 24 forms the fluid side which separates the separating piston 22 from the gas side 28, which is located in the remaining part of the hollow cylinder 24 and outside the open mouth of the rest, located on the bottom part 8 adjacent housing space.
  • the separating piston 22 has the shape of a pot whose depth is determined by the axial Er- extension of a piston skirt 30, which extends away from the top in Fig. 2 pot bottom 32 away.
  • the axial length of the piston skirt 30 is dimensioned such that at the end position of the travel position occupied by the separating piston 22 in the absence of pressure of the working gas, with its piston skirt 30 is present at the bottom part 8.
  • the separating piston 22 remains in this lower end position in guiding engagement with the hollow cylinder 24.
  • the top of the pot bottom 32 of the separating piston 22 convexly curved, wherein the curvature is adapted to the concave curvature of the inner side 16 of the upper housing part 4 such that the separating piston 22 at its upper end position, ie in the absence of fluid pressure, over the entire surface of the inner side 16 abuts.
  • the storage enclosure 2 is free of residual volume of remaining liquid at this end position.
  • the separating piston 22 occupies the position corresponding to the pressure compensation between the fluid side 26 and gas side 28 in the hollow cylinder, no differential pressure is effective on the wall of the hollow cylinder 24, so that the hollow cylinder 24 can be formed as a thin-walled tube with low material costs.
  • the assembly of hollow cylinder 24 and separating piston ben 22 can be prefabricated as a module or module for different types of storage.
  • a different tube length may be provided for different lengths of the storage housing. The invention enables such a cheap construction for storage devices in the form of piston accumulators.

Landscapes

  • 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 invention relates to an accumulator device, in particular in the form of a piston accumulator, having a dividing piston (22) which inside an accumulator housing (2) separates two media chambers (26, 28) from each other, and in particular separates a chamber (28) containing a working gas, such as nitrogen, from a chamber (26) containing a working fluid, such as hydraulic oil. The invention is characterized in that the dividing piston (22) is longitudinally movably guided in a guide device (24) and that the guide device (24) is arranged inside the accumulator housing (2) and extends at least partially along the longitudinal axis (10) thereof.

Description

Speichereinrichtung  memory device
Die Erfindung betrifft eine Speichereinrichtung, insbesondere in Form eines Kolbenspeichers, mit einem Trennkolben, der innerhalb eines Speichergehäuses zwei Medienräume voneinander trennt, insbesondere einen Raum mit einem Arbeitsgas, wie Stickstoff, von einem Raum mit einer Arbeitsflüs- sigkeit, wie Hydrauliköl. The invention relates to a storage device, in particular in the form of a piston accumulator, with a separating piston, which separates two media spaces within a storage housing, in particular a space with a working gas, such as nitrogen, from a space with a working fluid, such as hydraulic oil.
Speichereinrichtungen dieser Art sind in einer Vielfalt von Baugrößen und Ausführungsformen bekannt und auf dem Markt erhältlich. Sie kommen weit verbreitet zum Einsatz bei Hydrauliksystemen verschiedenster Art, bei- spielsweise für die Speicherung hydraulischer Energie, zum Dämpfen oder Glätten von Druckschwankungen oder dergleichen. Vielfach werden Speichereinrichtungen in Form von Kolbenspeichern auch bei Hydraulikanlagen in Arbeitsgerätschaften benutzt, die hydraulische Antriebseinheiten aufweisen, beispielsweise mobilen Arbeitsmaschinen, wie Bagger, Stapler, Lader oder mobile Krane. Memory devices of this type are known in a variety of sizes and embodiments and are available on the market. They are widely used in hydraulic systems of all kinds, for example for the storage of hydraulic energy, for damping or smoothing pressure fluctuations or the like. In many cases, storage devices in the form of piston accumulators are also used in hydraulic systems in working equipment having hydraulic drive units, for example mobile working machines, such as excavators, stackers, loaders or mobile cranes.
In Anbetracht dessen, dass aufgrund der vielfältigen Einsatzmöglichkeiten Speichereinrichtungen in hohen Stückzahlen herzustellen sind, stellt die Höhe der anfallenden Fertigungskosten einen wirtschaftlich äußerst bedeut- samen Faktor dar. Im Hinblick hierauf liegt der Erfindung die Aufgabe zugrunde, eine Speichereinrichtung der eingangs genannten Gattung zur Verfügung zu stellen, die besonders rationell und kostengünstig herstellbar ist und sich darüber hinaus durch ein besonders günstiges Betriebsverhalten auszeichnet. In view of the fact that memory devices are to be produced in large quantities due to the wide variety of possible uses, the amount of production costs involved represents an economically extremely important factor. In view of this, the invention is based on the object of providing a storage device of the type mentioned in the introduction which is particularly efficient and inexpensive to produce and is also characterized by a particularly favorable operating behavior.
Erfindungsgemäß ist diese Aufgabe durch eine Speichereinrichtung gelöst, die die Merkmale des Patentanspruchs 1 in seiner Gesamtheit aufweist. According to the invention this object is achieved by a memory device having the features of claim 1 in its entirety.
Gemäß dem kennzeichnenden Teil des Anspruchs 1 besteht eine wesentliche Besonderheit der Erfindung darin, dass der Trennkolben innerhalb einer Führungseinrichtung längsverf ahrbar geführt ist und dass die Führungsein- richtung innerhalb des Speichergehäuses angeordnet sich zumindest teilweise entlang dessen Längsachse erstreckt. Dadurch, dass erfindungsgemäß für den Trennkolben innerhalb des Speichergehäuses eine Führungseinrichtung vorgesehen ist, lässt sich das Speichergehäuse rationell und mit geringem Kostenaufwand fertigen, weil keine aufwendige Innenbearbeitung für eine direkte Führung des Trennkolbens an der Gehäuseinnenwand erforderlich ist. According to the characterizing part of claim 1, an essential feature of the invention is that the separating piston is guided longitudinally within a guide device and that the guide device arranged within the storage housing extends at least partially along its longitudinal axis. Characterized in that according to the invention for the separating piston within the storage housing, a guide device is provided, the storage housing can be rational and manufactured at low cost, because no complex internal machining for direct guidance of the separating piston on the housing inner wall is required.
Ein besonderer Vorteil der Erfindung besteht darin, dass eine baugleiche Einheit, bestehend aus Führungseinrichtung und zugehörigem Trennkolben, für verschiedene Speichergehäusegrößen einsetzbar ist, wodurch für die Fertigung unterschiedlich dimensionierter Speichereinrichtungen eine Modulbauweise verwirklichbar ist, was eine besonders rationelle Fertigung mit geringem Kostenaufwand ermöglicht. Das Vorhandensein einer sich im Speichergehäuse in dessen Längsrichtung erstreckenden Führungseinrich- tung verbessert zusätzlich das Betriebsverhalten durch eine Homogenisierung des Arbeitsgases aufgrund verringerter, im Betrieb auftretender Turbulenz. A particular advantage of the invention is that a structurally identical unit, consisting of guide device and associated separating piston, can be used for different memory housing sizes, whereby a modular design can be realized for the production of differently dimensioned memory devices, which allows a particularly efficient production with low cost. The presence of a guide device extending in the storage housing in its longitudinal direction additionally improves the operating behavior by homogenizing the working gas due to reduced turbulence occurring during operation.
Die Längserstreckung der Führungseinrichtung kann derart bemessen sein, dass in jeder möglichen Verfahrstellung des Trennkolbens dieser in der Führungseinrichtung verbleibt. In besonders vorteilhafter Weise kann die Führungseinrichtung aus einem Hohlzylinder, vorzugsweise mit gleichbleibender Wandstärke, gebildet sein, der mit seinem einen freien Ende an der Innenseite des Speicherge- häuses festgelegt ist. Ein entsprechender Hohlzylinder, an dessen Wand aufgrund der Bewegbarkeit des Trennkolbens im Betrieb keine Druckdifferenz wirksam ist, lässt sich verhältnismäßig dünnwandig kostengünstig herstellen und über eine Schweißstelle an der Innenseite des Gehäuses anbringen. The longitudinal extent of the guide device can be dimensioned such that it remains in the guide device in every possible displacement position of the separating piston. In a particularly advantageous manner, the guide device may be formed from a hollow cylinder, preferably with a constant wall thickness, which is fixed at its one free end to the inside of the storage housing. A corresponding hollow cylinder, on the wall due to the mobility of the separating piston during operation no pressure difference is effective, can be produced relatively thin-walled cost and attach via a weld on the inside of the housing.
Die Führungseinrichtung kann vorteilhafterweise derart in das Gehäuse eingebaut sein, dass der Trennkolben mit Teilen der Führungseinrichtung und mit den Teilen des Speichergehäuses, an denen ein Ende des Hohlzylinders fluiddicht festgelegt ist, den Medienraum mit der Arbeitsflüssigkeit be- grenzt. The guide device can advantageously be installed in the housing in such a way that the separating piston with parts of the guide device and with the parts of the storage housing on which one end of the hollow cylinder is fixed in a fluid-tight manner limits the media space with the working fluid.
Dabei können die genannten Teile des Speichergehäuses Bestandteil eines Gehäuseoberteils sein, insbesondere in Form eines Deckels, der auf seiner Innenseite zumindest teilweise der freien, stirnseitigen Außenkontur des Trennkolbens nachfolgt, die dem Gehäuseoberteil zugewandt ist. Bei fehlendem Druck der Arbeitsflüssigkeit ergibt sich dadurch eine sichere, großflächige Anlage des Trennkolbens an der Gehäusewand. The said parts of the storage housing may be part of a housing upper part, in particular in the form of a lid, which follows on its inside at least partially the free, frontal outer contour of the separating piston, which faces the upper housing part. In the absence of pressure of the working fluid, this results in a safe, large-scale system of the separating piston on the housing wall.
Hierfür kann die stirnseitige Außenkontur des Trennkolbens konvex geformt sein, um mit der konkav geformten Innenseite des Gehäuseoberteils zur Anlage zu kommen, sobald der Trennkolben seine eine Endlagenstellung erreicht hat, wobei die Arbeitsflüssigkeit aus dem zuordenbaren Medienraum völlig verdrängt ist. Vorteilhafterweise sind das Speichergehäuse und die Führungseinrichtung im Wesentlichen konzentrisch zueinander angeordnet, wobei zumindest über einen Mittenbereich des Speichergehäuses hinweg die Außenseite der Führungseinrichtung einen gleichbleibenden Abstand zu der Innenseite des Speichergehäuses einhält. Die Anordnung kann hierbei mit Vorteil so getroffen sein, dass die Führungseinrichtung mit ihrem freien Ende in Richtung eines Bodenteils des Speichergehäuses ausmündet, das als Halbkugel ausgebildet vorzugsweise einstückiger Bestandteil des topfförmig ausgebildeten Gehäuseunterteils ist. Die Längserstreckung des die Führungseinrichtung bildenden Hohlzylinders kann mit besonderem Vorteil derart getroffen sein, dass die Führungseinrichtung mit ihrem einen freien Ende in einem Übergangsbereich endet, bei dem der zylindrisch ausgebildete mittlere Speichergehäuseteil in den halbkugelförmigen Bodenteil des Gehäuses übergeht. For this purpose, the end-side outer contour of the separating piston may be convexly shaped in order to come into contact with the concave-shaped inner side of the housing upper part as soon as the separating piston has reached its one end position, wherein the working fluid is completely displaced from the allocatable media space. Advantageously, the storage housing and the guide means are arranged substantially concentric with each other, wherein at least over a central region of the storage housing, the outer side of the guide device maintains a constant distance to the inside of the storage housing. The arrangement may in this case be made such that the guide device opens with its free end in the direction of a bottom part of the storage housing, which is formed as a hemisphere preferably integral part of the cup-shaped housing lower part. The longitudinal extent of the hollow cylinder forming the guide device can be taken with particular advantage such that the guide device ends with its one free end in a transition region in which the cylindrically shaped middle storage housing part merges into the hemispherical bottom part of the housing.
Das Speichergehäuse kann mit besonderem Vorteil derart ausgebildet sein, dass eine Schweißverbindungsstelle zwischen Gehäuseoberteil und dem sich daran anschließenden Gehäuseteil von der Führungseinrichtung unter Beibehalten eines vorgebbaren Radialabstandes überdeckt ist. Die Füh- rungseinrichtung bildet dadurch eine schützende Abdeckung der Schweißstelle beim Schweißvorgang. The storage housing can be designed with particular advantage such that a weld joint between the upper housing part and the adjoining housing part is covered by the guide device while maintaining a predeterminable radial distance. The guide device thereby forms a protective covering of the weld during the welding process.
Nachstehend ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels im Einzelnen erläutert. The invention with reference to an embodiment shown in the drawing is explained in detail.
Es zeigen: Show it:
Fig. 1 eine Seitenansicht eines Ausführungsbeispiels der erfindungsgemäßen Speichereinrichtung und Fig. 2 einen Längsschnitt entsprechend der Schnittlinie II - II vonFig. 1 is a side view of an embodiment of the memory device according to the invention and Fig. 2 is a longitudinal section corresponding to the section line II - II of
Fig. 1 . Fig. 1.
Das in den Figuren dargestellte Ausführungsbeispiel weist ein Speichergehäuse 2 mit einem kreiszylindrischen Gehäusehauptteil 6, einem Gehäuseoberteil 4 und einem Bodenteil 8 auf. Gehäusehauptteil 6 und Bodenteil 8 bilden einen Topf, der bis auf einen zur Speicherlängsachse 10 koaxial ge- legenen Gas-Füllanschluss 12 geschlossen ist. Gehäusehauptteil 6 und Bodenteil 8 sind einstückig, beispielsweise in Form eines Tiefziehteils aus metallischem Werkstoff ausgebildet, wobei das Bodenteil 8 die Form einer Halbkugel besitzt, die in einem Übergangsbereich 14 in den zylindrischen Gehäusehauptteil 6 übergeht. Das Gehäuseoberteil 4 hat die Form einer Schale mit konkav geformter Innenseite 16 und ist, als Verschlussteil des Gehäuses 2, mittels einer Schweißstelle 18 mit dem zylindrischen Gehäusehauptteil 6 verbunden. Konzentrisch zur Längsachse 10 ist am Gehäuseoberteil 4 ein Fluidanschluss 20 für eine betreffende Arbeitsflüssigkeit, wie Hydrauliköl, vorgesehen. The exemplary embodiment illustrated in the figures has a storage housing 2 with a circular-cylindrical housing main part 6, an upper housing part 4 and a bottom part 8. The housing main part 6 and the bottom part 8 form a pot, which is closed except for a longitudinal axis 10 of the coaxially laid gas filling connection 12. Housing main part 6 and bottom part 8 are integrally formed, for example in the form of a deep-drawn part of metallic material, wherein the bottom part 8 has the shape of a hemisphere, which merges in a transition region 14 in the cylindrical housing main part 6. The upper housing part 4 has the shape of a shell with a concave inner side 16 and, as a closure part of the housing 2, is connected to the cylindrical housing main part 6 by means of a weld 18. Concentric with the longitudinal axis 10, a fluid connection 20 for a relevant working fluid, such as hydraulic oil, is provided on the upper housing part 4.
Obwohl die Speichereinrichtung einen Kolbenspeicher bildet, ist das Speichergehäuse 2 in der Art des Gehäuses für einen Blasenspeicher gestaltet, d.h. das Gehäuse 2 ist ohne eine Oberflächenbearbeitung der Innenseite, wie sie bei üblichen Kolbenspeichern zur Bildung einer Gleit- und Füh- rungsfläche für den jeweiligen Trennkolben erforderlich ist, auf einfache und kostengünstige Weise herstellbar, da diese Funktion bei der Erfindung für den Trennkolben 22 von einer Führungseinrichtung übernommen ist. Diese weist einen Hohlzylinder 24 auf, der sich im Gehäuse 2 zur Achse 10 konzentrisch erstreckt und innenseitig die Führungsbahn für den Trenn- kolben 22 bildet. Der Hohlzylinder 24 ist mit einem Ende am Gehäuseoberteil 4 fluiddicht durch Schweißen festgelegt und erstreckt sich mit sei- nem entgegengesetzten freien Ende bis zu dem Übergangsbereich 14, wo der zylindrische Gehäusehauptteil 6 in den Bodenteil 8 übergeht. Da das obere Ende des Hohlzylinders 24 durch das Gehäuseoberteil 4 fluiddicht geschlossen ist, bildet der oberhalb des Trennkolbens 22 im Hohlzylinder 24 befindliche Raum die Fluidseite, die der Trennkolben 22 von der Gasseite 28 separiert, die sich in dem übrigen Teil des Hohlzylinders 24 und außerhalb dessen offener Mündung im übrigen, an den Bodenteil 8 angrenzenden Gehäuseraum befindet. Wie der Fig. 2 entnehmbar ist, hat der Trennkolben 22 die Form eines Topfes, dessen Tiefe durch die axiale Er- Streckung eines Kolbenhemdes 30 bestimmt ist, das sich von dem in Fig. 2 obenliegenden Topfboden 32 weg nach unten erstreckt. Die axiale Länge des Kolbenhemdes 30 ist derart bemessen, dass bei der Endlage der Verfahrposition, die der Trennkolben 22 bei fehlendem Druck des Arbeitsgases einnimmt, mit seinem Kolbenhemd 30 am Bodenteil 8 ansteht. Bei dieser axialen Länge des Hohlzylinders 24, bei dem dessen offenes Ende zumindest in den Übergangsbereich 14 zwischen Bodenteil 8 und Hauptteil 6 reicht, verbleibt der Trennkolben 22 daher bei dieser unteren Endposition in Führungseingriff mit dem Hohlzylinder 24. Wie ersichtlich, ist die Oberseite des Topfbodens 32 des Trennkolbens 22 konvex gekrümmt, wobei die Krümmung an die konkave Krümmung der Innenseite 16 des Gehäuseoberteils 4 derart angepasst ist, dass der Trennkolben 22 bei seiner oberen Endstellung, d.h. bei fehlendem Fluiddruck, vollflächig an der Innenseite 16 anliegt. Somit ist das Speichergehäuse 2 bei dieser Endposition frei von einem Restvolumen verbleibender Flüssigkeit. Although the storage device forms a piston accumulator, the storage housing 2 is designed in the manner of the housing for a bladder accumulator, ie the housing 2 is without a surface treatment of the inside, as in conventional piston accumulators to form a sliding and guide surface for the respective separating piston is required, in a simple and inexpensive manner to produce, since this function is taken over in the invention for the separating piston 22 by a guide device. This has a hollow cylinder 24 which extends concentrically in the housing 2 to the axis 10 and on the inside forms the guide track for the separating piston 22. The hollow cylinder 24 is fixed fluid-tight with one end on the upper housing part 4 by welding and extends with its an opposite free end to the transition region 14, where the cylindrical housing main part 6 merges into the bottom part 8. Since the upper end of the hollow cylinder 24 is closed in a fluid-tight manner by the upper housing part 4, the space located above the separating piston 22 in the hollow cylinder 24 forms the fluid side which separates the separating piston 22 from the gas side 28, which is located in the remaining part of the hollow cylinder 24 and outside the open mouth of the rest, located on the bottom part 8 adjacent housing space. 2, the separating piston 22 has the shape of a pot whose depth is determined by the axial Er- extension of a piston skirt 30, which extends away from the top in Fig. 2 pot bottom 32 away. The axial length of the piston skirt 30 is dimensioned such that at the end position of the travel position occupied by the separating piston 22 in the absence of pressure of the working gas, with its piston skirt 30 is present at the bottom part 8. In this axial length of the hollow cylinder 24, in which its open end extends at least into the transition region 14 between the bottom part 8 and the main part 6, therefore, the separating piston 22 remains in this lower end position in guiding engagement with the hollow cylinder 24. As can be seen, the top of the pot bottom 32 of the separating piston 22 convexly curved, wherein the curvature is adapted to the concave curvature of the inner side 16 of the upper housing part 4 such that the separating piston 22 at its upper end position, ie in the absence of fluid pressure, over the entire surface of the inner side 16 abuts. Thus, the storage enclosure 2 is free of residual volume of remaining liquid at this end position.
Da der Trennkolben 22 im Hohlzylinder im Betrieb die dem Druckausgleich zwischen Fluidseite 26 und Gasseite 28 entsprechende Position einnimmt, ist an der Wand des Hohlzylinders 24 kein Differenzdruck wirksam, so dass der Hohlzylinder 24 als dünnwandiges Rohr mit geringem Materialaufwand ausbildbar ist. Die Baueinheit aus Hohlzylinder 24 und Trennkol- ben 22 kann vorgefertigt als Modul oder Baustein für unterschiedliche Speicherbauweisen eingesetzt werden. Gegebenenfalls kann, bei gleichem Rohrdurchmesser und baugleichem Trennkolben 22, eine unterschiedliche Rohrlänge für unterschiedliche Längen des Speichergehäuses vorgesehen sein. Die Erfindung ermöglicht dergestalt eine billige Bauweise für Speichereinrichtungen in Form von Kolbenspeichern. Since the separating piston 22 occupies the position corresponding to the pressure compensation between the fluid side 26 and gas side 28 in the hollow cylinder, no differential pressure is effective on the wall of the hollow cylinder 24, so that the hollow cylinder 24 can be formed as a thin-walled tube with low material costs. The assembly of hollow cylinder 24 and separating piston ben 22 can be prefabricated as a module or module for different types of storage. Optionally, with the same pipe diameter and identical separating piston 22, a different tube length may be provided for different lengths of the storage housing. The invention enables such a cheap construction for storage devices in the form of piston accumulators.

Claims

P a t e n t a n s p r ü c h e P a n t a n s p r e c h e
Speichereinrichtung, insbesondere in Form eines Kolbenspeichers, mit einem Trennkolben (22), der innerhalb eines Speichergehäuses (2) zwei Medienräume (26, 28) voneinander trennt, insbesondere einen Raum (28) mit einem Arbeitsgas, wie Stickstoff, von einem Raum (26) mit einer Arbeitsflüssigkeit, wie Hydrauliköl, dadurch gekennzeichnet, dass der Trennkolben (22) innerhalb einer Führungseinrichtung (24) längsverfahrbar geführt ist und dass die Führungseinrichtung (24) innerhalb des Speichergehäuses (2) angeordnet sich zumindest teilweise entlang dessen Längsachse (10) erstreckt. Storage device, in particular in the form of a piston accumulator, with a separating piston (22) which separates two media spaces (26, 28) within a storage housing (2), in particular a space (28) with a working gas, such as nitrogen, from a space (26 ) with a working fluid, such as hydraulic oil, characterized in that the separating piston (22) within a guide device (24) is guided longitudinally movable and that the guide means (24) within the storage housing (2) arranged at least partially along its longitudinal axis (10) ,
Speichereinrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Längserstreckung der Führungseinrichtung (24) derart bemessen ist, dass in jeder möglichen Verfahrstellung des Trennkolbens (22) dieser in der Führungseinrichtung (24) verbleibt. Storage device according to claim 1, characterized in that the longitudinal extension of the guide device (24) is dimensioned such that in each possible displacement position of the separating piston (22) this remains in the guide device (24).
Speichereinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Führungseinrichtung aus einem Hohlzylinder (24), vorzugsweise mit gleichbleibender Wandstärke, gebildet ist, der mit seinem einen freien Ende an der Innenseite (16) des Speichergehäuses (2) festgelegt ist. Storage device according to claim 1 or 2, characterized in that the guide device is formed from a hollow cylinder (24), preferably with a constant wall thickness, which is fixed with its one free end on the inside (16) of the storage housing (2).
Speichereinrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Trennkolben (22) mit Teilen der Führungseinrichtung (24) und mit den Teilen (4, 16) des Speichergehäuses (2), an denen ein Ende des Hohlzylinders (24) fluiddicht festgelegt ist, den Medienraum (26) mit der Arbeitsflüssigkeit begrenzt. Speichereinrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die genannten Teile des Speichergehäuses (2) Bestandteil eines Gehäuseoberteils (4), insbesondere in Form eines Deckels, sind, der auf seiner Innenseite (16) zumindest teilweise der freien stirnseitigen Außenkontur (32) des Trennkolbens (22) nachfolgt, die dem Gehäuseoberteil (4) zugewandt ist. 6. Speichereinrichtung nach einem der vorstehenden Ansprüche, Storage device according to one of the preceding claims, characterized in that the separating piston (22) with parts of the guide device (24) and with the parts (4, 16) of the storage housing (2), at which one end of the hollow cylinder (24) is fixed fluid-tight , the media space (26) limited with the working fluid. Storage device according to one of the preceding claims, characterized in that the said parts of the storage housing (2) part of a housing upper part (4), in particular in Form of a lid, which follows on its inner side (16) at least partially the free end-side outer contour (32) of the separating piston (22) facing the upper housing part (4). 6. Storage device according to one of the preceding claims,
dadurch gekennzeichnet, dass die stirnseitige Außenkontur (32) des Trennkolbens (22) konvex geformt ist zwecks Anlage an die konkav geformte Innenseite (16) des Gehäuseoberteils (4), sobald der Trennkolben (22) seine eine Endlagenstellung erreicht hat, bei der die Ar- beitsflüssigkeit aus dem einen zuordenbaren Medienraum (26) völlig verdrängt ist.  characterized in that the frontal outer contour (32) of the separating piston (22) is convexly shaped for abutment with the concave inner side (16) of the upper housing part (4), as soon as the separating piston (22) has reached its end position, in which the Ar - Beitsflüssigkeit from the one assignable media space (26) is completely displaced.
7. Speichereinrichtung nach einem der vorstehenden Ansprüche, 7. Storage device according to one of the preceding claims,
dadurch gekennzeichnet, dass das Speichergehäuse (2) und die Führungseinrichtung (24) im Wesentlichen konzentrisch zueinander angeordnet sind und dass zumindest über einen Mittenbereich (6) des Speichergehäuses (2) hinweg die Außenseite der Führungseinrichtung (24) einen gleichbleibenden Abstand zu der Innenseite des Speichergehäuses (2) einhält.  characterized in that the storage housing (2) and the guide means (24) are arranged substantially concentric with each other and that at least over a central region (6) of the storage housing (2) away the outside of the guide means (24) has a constant distance to the inside of Storage enclosure (2) complies.
8. Speichereinrichtung nach einem der vorstehenden Ansprüche, 8. Storage device according to one of the preceding claims,
dadurch gekennzeichnet, dass die Führungseinrichtung (24) mit ihrem freien Ende in Richtung eines Bodenteils (8) des Speichergehäuses (2) ausmündet, das als Halbkugel ausgebildet vorzugsweise einstückiger Bestandteil des topfförmig ausgebildeten Gehäusehauptteils (6) ist.  characterized in that the guide device (24) opens with its free end in the direction of a bottom part (8) of the storage housing (2), which is formed as a hemisphere preferably integral part of the cup-shaped housing main part (6).
9. Speichereinrichtung nach einem der vorstehenden Ansprüche, 9. Storage device according to one of the preceding claims,
dadurch gekennzeichnet, dass die Führungseinrichtung (24) mit ih- rem einen freien Ende in einem Übergangsbereich (14) endet, bei dem der zylindrisch ausgebildete mittlere Speicher-Gehäuseteil (6) in den halbkugelförmigen Bodenteil (8) des Gehäuses (2) übergeht. characterized in that the guide device (24) ends with its one free end in a transition region (14), in which the cylindrically shaped middle storage housing part (6) merges into the hemispherical bottom part (8) of the housing (2).
10. Speichereinrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass eine Schweißverbindungsstelle (18) zwischen Gehäuseoberteil (4) und dem sich daran anschließenden Gehäuseteil (6) von der Führungseinrichtung (24) unter Beibehalten eines vorgebbaren Radialabstandes überdeckt ist. 10. Storage device according to one of the preceding claims, characterized in that a weld joint (18) between the upper housing part (4) and the adjoining housing part (6) of the guide means (24) is covered while maintaining a predeterminable radial distance.
EP14816135.9A 2014-01-14 2014-12-19 Accumulator Active EP3094867B1 (en)

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DE102014000380.9A DE102014000380A1 (en) 2014-01-14 2014-01-14 memory device
PCT/EP2014/003445 WO2015106792A1 (en) 2014-01-14 2014-12-19 Accumulator device

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US20160333896A1 (en) 2016-11-17
US10330124B2 (en) 2019-06-25
WO2015106792A1 (en) 2015-07-23
DE102014000380A1 (en) 2015-07-16

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