EP1601879A1 - Hydraulic accumulator comprising a position indicator - Google Patents

Hydraulic accumulator comprising a position indicator

Info

Publication number
EP1601879A1
EP1601879A1 EP04704192A EP04704192A EP1601879A1 EP 1601879 A1 EP1601879 A1 EP 1601879A1 EP 04704192 A EP04704192 A EP 04704192A EP 04704192 A EP04704192 A EP 04704192A EP 1601879 A1 EP1601879 A1 EP 1601879A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder tube
hydraulic accumulator
permanent magnets
separating element
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
EP04704192A
Other languages
German (de)
French (fr)
Other versions
EP1601879B1 (en
Inventor
Walter Dorr
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 EP1601879A1 publication Critical patent/EP1601879A1/en
Application granted granted Critical
Publication of EP1601879B1 publication Critical patent/EP1601879B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F15B2201/20—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
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F15B2201/312—Sealings therefor, e.g. piston rings
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • 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
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/515—Position detection for separating means

Definitions

  • the invention relates to hydraulic accumulators, such as those provided, among other things , in connection with hydraulic systems for receiving certain volumes of pressurized liquid (for example hydraulic medium) and returning them to the system if required.
  • pressurized liquid for example hydraulic medium
  • hydropneumatic (gas-pressurized) accumulators are used today, with the movable separating element within the accumulator housing separating a liquid space as the one working space from a gas storage space as the further working space. Nitrogen gas is regularly used as the working gas, and the gas-tight separating element, for example a piston, if it is a piston accumulator, largely allows a decoupling from the gas storage space to the liquid space.
  • the liquid part is connected to the hydraulic circuit of the system, so that the accumulator absorbs liquid when the pressure rises and the gas is compressed. When the pressure drops, the compressed gas expands and displaces the stored hydraulic fluid back into the hydraulic circuit. Due to the changes in the company. Volumes of gas storage space and liquid space each result in a corresponding axial movement of the support element within the storage housing.
  • the gas pre-filling pressure in the gas supply has a pressure value that is adapted to the pressure level of the liquid part, so that the separating element, i.e. the piston accumulators of the pistons, is located at a suitable point within the cylinder housing , so that the separating element can carry out the required working movements in the axial direction between the end positions in the storage housing.
  • the object of the invention is to create a hydraulic storage device which enables the size of the volumes of the working spaces and thus the position of the separating element to be determined in a simple manner during operation.
  • the row of magnetic field sensors on the outside of the cylinder tube is essentially along the entire stroke path of the Piston arranged.
  • the piston is formed from non-magnetizable material, and the magnet arrangement which generates the magnetic field on the piston has a plurality of permanent magnets which are arranged distributed around the circumference of the piston and are aligned with one another in relation to the axial direction.
  • a particularly simple design provides for the magnetic field sensors on the outside of the cylinder tube a series of movable, preferably rod-like permanent magnets, of which those which are aligned with the field generated by the magnet arrangement on the piston can be deflected into a display position by the latter.
  • the rod-like permanent magnets function here as visually recognizable display markings, the deflection of which gives an immediate visual display of the respective piston position.
  • the rod-like permanent magnets can be deflected against a low restoring force, so that when the piston moves, when the magnetic field of the piston moves out of their area, they automatically return to a starting position.
  • the rod-like permanent magnets are freely pivotable for their deflection movement about pivot axes, which are located outside the centers of gravity of the rod-like permanent magnets, so that the acting gravity generates a restoring moment on the rod-like permanent magnets.
  • Stainless steel or a non-ferritic metal alloy, for example aluminum alloy can be provided as the material for the non-magnetizable storage housing or, if it is a pressure level of limited height, possibly a plastic material.
  • the invention is explained in detail below using an exemplary embodiment shown in the drawing. Show it:
  • FIG. 1 shows a longitudinal section of an exemplary embodiment of the hydraulic accumulator according to the invention in the form of a piston accumulator; 2 shows a longitudinal section, drawn on a somewhat larger scale than that of FIG. 1, only of the piston of the exemplary embodiment corresponding to the section line labeled III-III in FIG. 3, and FIG. 3 shows a plan view of the piston shown separately in FIG.
  • the embodiment of the hydraulic accumulator according to the invention shown in the drawing is a piston accumulator with a accumulator housing in the form of a circular cylindrical cylinder tube 1, which defines a longitudinal axis 3.
  • a piston 9 can be moved in the axial direction as a separating element between a gas storage space 5 and a fluid space 7.
  • the piston 9 has piston seals 11 and piston guide means 13 in annular grooves which are incorporated into its circumferential surface, which enable low-friction and gas-tight guidance of the piston 9 along the longitudinal axis 3.
  • the cylinder tube 1 is closed by a screwed-in cylinder cover 15. This is traversed by a gas channel 17 to which a gas valve or a filling valve can be connected (neither of which is shown). In a similar manner, the cylinder tube 1 is closed at the end assigned to the fluid space 7 by a screwed-in cover 19 which has a central fluid passage 21.
  • the piston 9 has a trough-like inner trough 23, which is concentric with the axis 3 and is open at the piston end facing the gas storage space 5, so that it increases the volume of the gas storage space 5.
  • an annular body 25 which is concentric with the axis 3 is screwed to the piston 9 by means of connecting screws 27.
  • This ring body 25, whose inner ring opening is aligned with the opening edge of the recess 23 of the piston 9, is made of non-magnetizable material, preferably the same material as the piston 9.
  • the annular body 25 serves as a support ring for permanent magnets 29 which are embedded in the circumferential surface of the annular body 25 concentric with the cylinder tube 1 in such a way that their radially outer pole end surfaces 28 (FIG. 2) have a small radial distance from the circumference of the piston 9 and thus from the Have inside wall of the cylinder tube 1, see Fig. 3, in which the outer surface of the piston 9 is designated 31.
  • fifteen permanent magnets 29 are arranged at regular angular intervals around the circumference of the piston 9, the permanent magnets 29 being arranged in the same polarity orientation, so that the radially outer pole end faces 28 each form magnetic poles of the same name.
  • the piston 9 can be moved during operation along a piston stroke path between an upper end position, in which the ring body 25 rests on the upper cylinder cover 15, and a lower end position, in which the opposite side of the piston 9 to the lower cover 19 is approximated.
  • the permanent magnets arranged on the ring body 25 of the piston 9 move along the length of a sensor strip 33 running longitudinally on the outside of the cylinder tube 1.
  • On this there is a series of permanent magnets which, in the example shown, have the shape of small bar magnets 35 (only a few of which are numbered in the figure) are arranged, the row of bar magnets 35 extending essentially over the entire length of the sensor strip 33.
  • the bar magnets 35 are pivotally mounted on pivot bearings 37 (only a few are numbered in the figure), the pivot axes each extending perpendicular to the longitudinal axis 3 and parallel to the tangent to the adjacent circumference of the cylinder tube 1.
  • pivot bearings 37 only a few are numbered in the figure
  • the bar magnets 35 can be deflected by the magnetic field that the permanent magnets 29 produce on the ring body 25 of the piston 9 on the longitudinal section of the sensor strip 33 on which the permanent magnets 29 are located.
  • this deflection is shown for the piston position shown, in which the piston is located at a short distance from the upper cylinder cover 15.
  • the third bar magnet 35 (counted from above) is deflected into the horizontal position, while adjacent second bar magnet 35 and fourth bar magnet 35 are partially deflected.
  • This deflection of the bar magnets 35 allows the respective position of the piston 9 within the cylinder tube 1 to be determined by visual comparison with the undeflected other magnets 35 of the sensor strip 33.
  • the bar magnets 35 can be provided with a signal coloring.
  • the bar magnets 35 can be mounted on the sensor bar 33 in such a way that the deflection of bar magnets 35 caused by the magnetic field on the piston 9 takes place against a low restoring force, so that the bar magnets 35 serving as display elements during migration of the magnetic field, ie during the stroke movement of the piston 9, automatically return to an initial or non-display position.
  • the restoring force can be effected in any suitable manner, for example in a simple manner in that the pivot axes 37 of the bar magnets 35 are located outside their center of gravity, so that the bar magnets 35 are automatically reset by gravity when the magnetic field does not act.
  • the sensor bar 33 itself could be designed as a device generating a weak magnetic field, for example the sensor bar 33 itself could form a weak bar magnet ,
  • a non-magnetizable material is provided for the cylinder tube 1, the piston 9 and its ring body 25 in the invention.
  • a non-magnetizable steel stainless steel
  • a non-ferritic metal alloy aluminum alloy or also a plastic material
  • a plastic material can be provided for the cylinder tube 1.

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)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Actuator (AREA)

Abstract

A hydraulic accumulator includes an accumulator housing ( 1 ) formed of a non-magnetizable material and defining an axial direction of the housing. A separating element ( 9 ) can be axially displaced in the accumulator housing ( 1 ) and separates two working chambers ( 5, 7 ) from each other in the accumulator housing ( 1 ). A field-generating magnetic configuration ( 29 ) is arranged on the separating element. A series of magnetic field sensors ( 35 ) are arranged on the outer side of the accumulator housing ( 1 ), extend along the path of the axial movement of the separating element ( 9 ) and react to the field of the magnetic configuration ( 29 ) on the separating element ( 9 ) to characterize its position along the series of magnetic field sensors ( 35 ).

Description

HYDROSPEICHER MIT POSITIONSÄNZEIGE HYDRO TANK WITH POSITION INDICATOR
Die Erfindung bezieht sich auf Hydrospeicher, wie sie, unter ande em/ in Verbindung mit Hydroanlagen dazu vorgesehen sind, bestimmte Volumina unter Druck stehender Flüssigkeit (beispielsweise Hydraulikmedium) aufzu- nehmen und diese bei Bedarf an die Anlage zurückzugeben. In den meisten Hydroanlagen werden heutzutage hydropneumatische (gasbeaufschlagte) Speicher eingesetzt, wobei das bewegliche Trennelement innerhalb des Speichergehäuses einen Flüssigkeitsraum als den einen Arbeitsraum von einem Gasvorratsraum als dem weiteren Arbeitsraum trennt. Als Arbeitsgas kommt regelmäßig Stickstoffgas zum Einsatz, und das gasdichte Trennelement, beispielsweise ein Kolben, wenn es sich um einen Kolbenspeicher handelt, erlaubt weitgehend eine Entkoppelung von Gasvorratsraum zu Flüssigkeitsraum.The invention relates to hydraulic accumulators, such as those provided, among other things , in connection with hydraulic systems for receiving certain volumes of pressurized liquid (for example hydraulic medium) and returning them to the system if required. In most hydraulic systems, hydropneumatic (gas-pressurized) accumulators are used today, with the movable separating element within the accumulator housing separating a liquid space as the one working space from a gas storage space as the further working space. Nitrogen gas is regularly used as the working gas, and the gas-tight separating element, for example a piston, if it is a piston accumulator, largely allows a decoupling from the gas storage space to the liquid space.
Der Flüssigkeitsteil steht mit dem Hydrokreislauf der Anlage in Verbindung, so dass der Speicher beim Anstieg des Druckes Flüssigkeit aufnimmt und das Gas dabei komprimiert wird. Bei sinkendem Druck dehnt sich das verdichtete Gas aus und verdrängt dabei die gespeicherte Druckflüssigkeit zurück in den Hydrokreislauf. Durch die sich im Betrieb ergebenden Verände- rungen der. Volumina von Gasvorratsraum und Flüssigkeitsraum ergibt sich jeweils eine entsprechende Axialbewegung des Trehnelementes innerhalb des Speichergehäuses. Für das gewünschte, einwandfreie Betriebsverhalten von Hydrospeichern ist Voraussetzung, dass der im Gasvorrats räum herrschende Gas-Vorfülldruck einen an das Druckniveau des Flüssigkeitsteiles angepaßten Druckwert besitzt, so dass sich das Trennelement, also bei Kolbenspeichern der Kolben, an einer geeigneten Stelle innerhalb des Zylindergehäuses befindet, so dass das Trennelement die erforderlichen Arbeitsbewegungen in Axialrichtung zwischen den Endpositionen im Speichergehäuse ausführen kann.The liquid part is connected to the hydraulic circuit of the system, so that the accumulator absorbs liquid when the pressure rises and the gas is compressed. When the pressure drops, the compressed gas expands and displaces the stored hydraulic fluid back into the hydraulic circuit. Due to the changes in the company. Volumes of gas storage space and liquid space each result in a corresponding axial movement of the support element within the storage housing. For the desired, correct operating behavior of hydraulic accumulators, it is a prerequisite that the gas pre-filling pressure in the gas supply has a pressure value that is adapted to the pressure level of the liquid part, so that the separating element, i.e. the piston accumulators of the pistons, is located at a suitable point within the cylinder housing , so that the separating element can carry out the required working movements in the axial direction between the end positions in the storage housing.
Im Hinblick hierauf stellt sich die Erfindung die Aufgabe, einen Hydrospei- eher zu schaffen, der während des Betriebes eine Feststellung der Größe der Volumina der Arbeitsräume und damit der Position des Trennelementes auf einfache Weise ermöglicht.In view of this, the object of the invention is to create a hydraulic storage device which enables the size of the volumes of the working spaces and thus the position of the separating element to be determined in a simple manner during operation.
Erfindungsgemäß ist diese Aufgabe durch einen Hydrospeicher gelöst, der die in Anspruch 1 angegebenen Merkmale a) bis d) aufweist.According to the invention, this object is achieved by a hydraulic accumulator which has the features a) to d) specified in claim 1.
Danach steht bei dem erfindungsgemäßen Hydrospeicher eine berührungslose, durch die Wandung des Speichergehäuses nach außen übertragene Anzeige für die Position des Trennelementes zur Verfügung, so dass wäh- rend des Betriebes eine einfache und sichere Überwachung des Betriebszustands des Hydrospeichers ermöglicht ist.Thereafter, in the hydraulic accumulator according to the invention, a contactless display for the position of the separating element, which is transmitted through the wall of the accumulator housing, is available, so that simple and reliable monitoring of the operating state of the hydraulic accumulator is made possible during operation.
Wenn es sich um einen Kolbenspeicher handelt, bei dem als Speichergehäuse ein Zylinderrohr vorgesehen ist, in dem ein das Trennelement bil- dender Kolben axial über einen Kolbenhubweg verfahrbar ist, ist die Reihe der Magnetfeldsensoren an der Außenseite des Zylinderrohres im wesentlichen längs des gesamten Hubweges des Kolbens angeordnet. Bei einem besonders vorteilhaften Ausführungsbeispiel ist der Kolben aus nicht-magnetisierbarem Werkstoff gebildet, und die das Magnetfeld am Kolben erzeugende Magnetanordnung weist mehrere um den Umfang des Kolbens verteilt angeordnete Dauermagnete auf, die, bezogen auf die Axial- richtung, miteinander fluchtend sind.If it is a piston accumulator in which a cylinder tube is provided as the accumulator housing, in which a piston forming the separating element can be moved axially over a piston stroke path, the row of magnetic field sensors on the outside of the cylinder tube is essentially along the entire stroke path of the Piston arranged. In a particularly advantageous exemplary embodiment, the piston is formed from non-magnetizable material, and the magnet arrangement which generates the magnetic field on the piston has a plurality of permanent magnets which are arranged distributed around the circumference of the piston and are aligned with one another in relation to the axial direction.
Eine besonders einfache Bauweise sieht für die Magnetfeldsensoren an der Außenseite des Zylinderrohres eine Reihe beweglicher, vorzugsweise stäbchenartiger Dauermagnete vor, von denen solche, die auf das von der Magnetanordnung am Kolben erzeugte Feld ausgerichtet sind, durch dieses in eine Anzeigestellung auslenkbar sind. Die stäbchenartigen Dauermagnete fungieren hierbei als visuell erkennbare Anzeigemarkierungen, deren Auslenkung eine unmittelbare optische Anzeige der jeweiligen Kolbenstellung ergibt.A particularly simple design provides for the magnetic field sensors on the outside of the cylinder tube a series of movable, preferably rod-like permanent magnets, of which those which are aligned with the field generated by the magnet arrangement on the piston can be deflected into a display position by the latter. The rod-like permanent magnets function here as visually recognizable display markings, the deflection of which gives an immediate visual display of the respective piston position.
Vorzugsweise sind die stäbchenartigen Dauermagnete hierbei gegen eine geringe Rückstell kraft auslenkbar, so dass sie beim Verfahren des Kolbens, wenn das Magnetfeld des Kolbens aus ihrem Bereich auswandert, selbsttätig in eine Ausgangsstellung zurückkehren. Hierfür kann beispielsweise vorge- sehen sein, dass die stäbchenartigen Dauermagnete für ihre Auslenkbewegung um Schwenkachsen frei schwenkbar gelagert sind, die außerhalb der Schwerezentren der stäbchenartigen Dauermagnete gelegen sind, so dass die wirkende Schwerkraft ein Rückstell moment an den stäbchenartigen Dauermagneten erzeugt.Preferably, the rod-like permanent magnets can be deflected against a low restoring force, so that when the piston moves, when the magnetic field of the piston moves out of their area, they automatically return to a starting position. For this purpose, it can be provided, for example, that the rod-like permanent magnets are freely pivotable for their deflection movement about pivot axes, which are located outside the centers of gravity of the rod-like permanent magnets, so that the acting gravity generates a restoring moment on the rod-like permanent magnets.
Als Werkstoff für das nicht-magnetisi erbare Speichergehäuse kann Edelstahl oder eine nicht-ferritische Metallegierung, beispielsweise Aluminiumlegierung, vorgesehen sein oder, wenn es sich um ein Druckniveau begrenzter Höhe handelt, gegebenenfalls ein Kunststoffwerkstoff. Nachstehend ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles im einzelnen erläutert. Es zeigen:Stainless steel or a non-ferritic metal alloy, for example aluminum alloy, can be provided as the material for the non-magnetizable storage housing or, if it is a pressure level of limited height, possibly a plastic material. The invention is explained in detail below using an exemplary embodiment shown in the drawing. Show it:
• Fig. 1 einen Längsschnitt eines Ausführungsbeispieles des erfindungsgemäßen Hydrospeichers in Form eines Kolbenspeichers; • Fig. 2 einen gegenüber Fig. 1 in etwas größerem Maßstab gezeichneten Längsschnitt nur des Kolbens des Ausführungsbeispieles entsprechend der in Fig. 3 mit lll-lll bezeichneten Schnittlinie und • Fig. 3 eine Draufsicht des in Fig. 2 gesondert gezeigten Kolbens.1 shows a longitudinal section of an exemplary embodiment of the hydraulic accumulator according to the invention in the form of a piston accumulator; 2 shows a longitudinal section, drawn on a somewhat larger scale than that of FIG. 1, only of the piston of the exemplary embodiment corresponding to the section line labeled III-III in FIG. 3, and FIG. 3 shows a plan view of the piston shown separately in FIG.
Bei dem in der Zeichnung dargestellten Ausführungsbeispiel des erfindungsgemäßen Hydrospeichers handelt es sich um einen Kolbenspeicher mit einem Speichergehäuse in Form eines kreiszylindrischen Zylinderrohres 1 , das eine Längsachse 3 definiert. Im Zylinderrohr 1 ist als Trennelement zwischen einem Gasvorratsraum 5 und einem Fluidraum 7 ein Kolben 9 in Axial richtung verfahrbar. In bei Kolbenspeichern an sich bekannter Weise weist der Kolben 9 in Ringnuten, die in seine Umfangsfläche eingearbeitet sind, Kolbendichtungen 1 1 und Kolbenführungsmittel 13 auf, die eine rei- bungsarme und gasdichte Führung des Kolbens 9 entlang der Längsachse 3 ermöglichen.The embodiment of the hydraulic accumulator according to the invention shown in the drawing is a piston accumulator with a accumulator housing in the form of a circular cylindrical cylinder tube 1, which defines a longitudinal axis 3. In the cylinder tube 1, a piston 9 can be moved in the axial direction as a separating element between a gas storage space 5 and a fluid space 7. In a manner known per se in the case of piston accumulators, the piston 9 has piston seals 11 and piston guide means 13 in annular grooves which are incorporated into its circumferential surface, which enable low-friction and gas-tight guidance of the piston 9 along the longitudinal axis 3.
An dem den Gasvorratsraum 5 abschließenden Ende ist das Zylinderrohr 1 durch einen eingeschraubten Zylinderdeckel 1 5 abgeschlossen. Dieser ist durch einen Gaskanal 1 7 durchzogen, an dem ein Gasventil oder eine Füllarmatur anschließbar ist (beides nicht dargestellt). In ähnlicher Weise ist das Zylinderrohr 1 an dem dem Fluidraum 7 zugeordneten Ende durch einen eingeschraubten Deckel 19 abgeschlossen, der einen zentralen Fluiddurchlaß 21 aufweist.At the end of the gas storage space 5, the cylinder tube 1 is closed by a screwed-in cylinder cover 15. This is traversed by a gas channel 17 to which a gas valve or a filling valve can be connected (neither of which is shown). In a similar manner, the cylinder tube 1 is closed at the end assigned to the fluid space 7 by a screwed-in cover 19 which has a central fluid passage 21.
Der Kolben 9 weist eine trogartige innere Mulde 23 auf, die zur Achse 3 konzentrisch und an dem dem Gasvorratsraum 5 zugewandten Kolbenende offen ist, so dass sie das Volumen des Gasvorratsraumes 5 vergrößert. An der das offene Ende der Mulde 23 aufweisenden Kolbenseite ist am Kolben 9 ein zur Achse 3 konzentrischer Ringkörper 25 mittels Verbindungs- schrauben 27 verschraubt. Dieser Ringkörper 25, dessen innere Ringöffnung mit dem Öffnungsrand der Mulde 23 des Kolbens 9 fluchtet, ist aus nicht-magnetisierbarem Werkstoff, vorzugsweise dem gleichen Material wie der Kolben 9, gefertigt. Der Ringkörper 25 dient als Tragring für Dauermagnete 29, die in die zum Zylinderrohr 1 konzentrische Umfangsfläche des Ringkörpers 25 so eingelassen sind, dass ihre radial außenliegenden Polendflächen 28 (Fig. 2) einen geringen, radialen Abstand vom Umfang des Kolbens 9 und damit von der Innenwand des Zylinderrohres 1 haben, siehe Fig. 3, in der die Mantelfläche des Kolbens 9 mit 31 bezeichnet ist.The piston 9 has a trough-like inner trough 23, which is concentric with the axis 3 and is open at the piston end facing the gas storage space 5, so that it increases the volume of the gas storage space 5. On the piston side having the open end of the recess 23, an annular body 25 which is concentric with the axis 3 is screwed to the piston 9 by means of connecting screws 27. This ring body 25, whose inner ring opening is aligned with the opening edge of the recess 23 of the piston 9, is made of non-magnetizable material, preferably the same material as the piston 9. The annular body 25 serves as a support ring for permanent magnets 29 which are embedded in the circumferential surface of the annular body 25 concentric with the cylinder tube 1 in such a way that their radially outer pole end surfaces 28 (FIG. 2) have a small radial distance from the circumference of the piston 9 and thus from the Have inside wall of the cylinder tube 1, see Fig. 3, in which the outer surface of the piston 9 is designated 31.
Wie Fig. 3 zeigt, sind beim hier beschriebenen Ausführungsbeispiel rings um den Umfang des Kolbens 9 fünfzehn Dauermagnete 29 in regelmäßigen Winkelabständen zueinander angeordnet, wobei die Dauermagnete 29 in jeweils gleicher Polaritätsausrichtung angeordnet sind, so dass die radial außenliegenden Polendflächen 28 jeweils gleichnamige Magnetpole bilden.As shown in FIG. 3, in the exemplary embodiment described here, fifteen permanent magnets 29 are arranged at regular angular intervals around the circumference of the piston 9, the permanent magnets 29 being arranged in the same polarity orientation, so that the radially outer pole end faces 28 each form magnetic poles of the same name.
Wie aus Fig. 1 zu ersehen ist, ist der Kolben 9 im Betrieb längs eines Kolbenhubweges zwischen einer oberen Endlage, bei der der Ringkörper 25 am oberen Zylinderdeckel 15 anliegt, und einer unteren Endlage verfahrbar, bei der die entgegengesetzte Seite des Kolbens 9 an den unteren Deckel 19 angenähert ist. Bei der Bewegung zwischen diesen Endlagen bewegen sich die am Ringkörper 25 des Kolbens 9 angeordneten Dauermagnete längs der Länge einer an der Außenseite des Zylinderrohres 1 längs verlaufenden Sensorleiste 33. An dieser ist eine Reihe von Dauermagneten, die beim ge- zeigten Beispiel die Form kleiner Stabmagnete 35 haben (von denen lediglich einige in der Fig. beziffert sind), angeordnet, wobei sich die Reihe der Stabmagnete 35 im wesentlichen über die gesamte Länge der Sensorleiste 33 erstreckt. Die Stabmagnete 35 sind an Schwenklagern 37 (von lediglich einige in der Fig. beziffert sind) schwenkbar gelagert, wobei sich die Schwenkachsen jeweils senkrecht zur Längsachse 3 und parallel zur Tangente am benachbarten Umfang des Zylinderrohres 1 erstrecken. Bei dieser Lagerung der Stabmagnete 35 sind diese durch das Magnetfeld, das die Dauermagnete 29 am Ringkörper 25 des Kolbens 9 erzeugen, an demjenigen Längenabschnitt der Sensorleiste 33 auslenkbar, an dem sich die Dau- ermagnete 29 befinden. In Fig. 1 ist diese Auslenkung für die gezeigte Kolbenstellung dargestellt, bei der der Kolben sich in geringem Abstand vom oberen Zylinderdeckel 15 befindet. Wie aus Fig. 1 zu ersehen ist, ist bei dieser Kolbenstellung der dritte Stabmagnet 35 (von oben gezählt) in die Horizontalstellung ausgelenkt, während benachbarter zweiter Stabmagnet 35 und vierter Stabmagnet 35 teilweise ausgelenkt sind.As can be seen from Fig. 1, the piston 9 can be moved during operation along a piston stroke path between an upper end position, in which the ring body 25 rests on the upper cylinder cover 15, and a lower end position, in which the opposite side of the piston 9 to the lower cover 19 is approximated. During the movement between these end positions, the permanent magnets arranged on the ring body 25 of the piston 9 move along the length of a sensor strip 33 running longitudinally on the outside of the cylinder tube 1. On this there is a series of permanent magnets which, in the example shown, have the shape of small bar magnets 35 (only a few of which are numbered in the figure) are arranged, the row of bar magnets 35 extending essentially over the entire length of the sensor strip 33. The bar magnets 35 are pivotally mounted on pivot bearings 37 (only a few are numbered in the figure), the pivot axes each extending perpendicular to the longitudinal axis 3 and parallel to the tangent to the adjacent circumference of the cylinder tube 1. When the bar magnets 35 are mounted in this way, they can be deflected by the magnetic field that the permanent magnets 29 produce on the ring body 25 of the piston 9 on the longitudinal section of the sensor strip 33 on which the permanent magnets 29 are located. In Fig. 1 this deflection is shown for the piston position shown, in which the piston is located at a short distance from the upper cylinder cover 15. As can be seen from FIG. 1, in this piston position the third bar magnet 35 (counted from above) is deflected into the horizontal position, while adjacent second bar magnet 35 and fourth bar magnet 35 are partially deflected.
Diese Auslenkung der Stabmagnete 35 erlaubt durch visuellen Vergleich mit den nicht ausgelenkten übrigen Magneten 35 der Sensorleiste 33 eine Feststellung der jeweiligen Stellung des Kolbens 9 innerhalb des Zylinder- rohres 1 .This deflection of the bar magnets 35 allows the respective position of the piston 9 within the cylinder tube 1 to be determined by visual comparison with the undeflected other magnets 35 of the sensor strip 33.
Um die Anzeige augenfällig zu machen, können die Stabmagnete 35 mit einer Signalfärbung versehen sein. Die Stabmagnete 35 können an der Sensorleiste 33 so gelagert sein, dass die durch das Magnetfeld am Kolben 9 bewirkte Auslenkung von Stabmagneten 35 gegen eine geringe Rückstell kraft erfolgt, so dass die als Anzeigeelemente dienenden Stabmagnete 35 beim Auswandern des Magnetfeldes, d. h. bei Hubbewegung des Kolbens 9, selbsttätig in eine Ausgangs- oder Nichtanzeigestellung zurückkehren. Die Rückstell kraft kann auf beliebige geeignete Weise bewirkt werden, beispielsweise in einfacher Weise dadurch, dass die Schwenkachsen 37 der Stabmagnete 35 außerhalb von deren Schwerezentrum gelegen sind, so dass die Stabmagnete 35 bei nicht wirkendem Magnetfeld selbsttätig durch Schwerkraft zurückgestellt werden. Um eine Rückstell kraft der Stabmagnete 35 zu erzeugen, so dass sie sich bei fehlendem, auslenkendem Magnetfeld parallel zur Längsachse 3 erstrecken, könnte die Sensorleiste 33 selbst als eine ein schwaches Magnetfeld erzeugende Einrichtung ausgebildet sein, beispielsweise könnte die Sensorleiste 33 selbst einen schwachen Stabmagneten bilden.In order to make the display obvious, the bar magnets 35 can be provided with a signal coloring. The bar magnets 35 can be mounted on the sensor bar 33 in such a way that the deflection of bar magnets 35 caused by the magnetic field on the piston 9 takes place against a low restoring force, so that the bar magnets 35 serving as display elements during migration of the magnetic field, ie during the stroke movement of the piston 9, automatically return to an initial or non-display position. The restoring force can be effected in any suitable manner, for example in a simple manner in that the pivot axes 37 of the bar magnets 35 are located outside their center of gravity, so that the bar magnets 35 are automatically reset by gravity when the magnetic field does not act. In order to generate a restoring force of the bar magnets 35 so that they extend parallel to the longitudinal axis 3 in the absence of a deflecting magnetic field, the sensor bar 33 itself could be designed as a device generating a weak magnetic field, for example the sensor bar 33 itself could form a weak bar magnet ,
Wie bereits erwähnt, ist bei der Erfindung ein nicht-magnetisierbarer Werkstoff für das Zylinderrohr 1 , den Kolben 9 und dessen Ringkörper 25 vorgesehen. Beispielsweise kann für das Zylinderrohr 1 , je nach Druckniveau, für das der Speicher vorgesehen ist, ein nicht-magnetisierbarer Stahl (Edelstahl), eine nicht-ferritische Metallegierung, Aluminiumlegierung oder auch ein Kunststoffmaterial vorgesehen sein. As already mentioned, a non-magnetizable material is provided for the cylinder tube 1, the piston 9 and its ring body 25 in the invention. For example, depending on the pressure level for which the store is intended, a non-magnetizable steel (stainless steel), a non-ferritic metal alloy, aluminum alloy or also a plastic material can be provided for the cylinder tube 1.

Claims

A n s p r ü c h e Expectations
1 . Hydrospeicher, der aufweist: a) ein Speichergehäuse (1 ) aus nicht-magnetisierbarem Werkstoff, das eine Axialrichtung des Gehäuses definiert, b) ein im Speichergehäuse (1 ) axial bewegbares Trennelement (9), das im Speichergehäuse (1) zwei Arbeitsräume (5,7) voneinander trennt, c) eine am Trennelement (9) angeordnete, ein Feld erzeugende Ma- gnetanordnung (29) und d) eine an der Außenseite des Speichergehäuses (1 ) angeordnete, sich längs der Bahn der Axialbewegung des Trennelementes (9) erstreckende Reihe von Magnetfeldsensoren (35), die auf das Feld der Magnetanordnung (29) am Trennelement (9) ansprechen, um dessen Position entlang der Reihe von Magnetfeldsensoren (35) zu kennzeichnen.1 . Hydraulic accumulator, which has: a) a accumulator housing (1) made of non-magnetizable material, which defines an axial direction of the housing, b) a separating element (9) which can be moved axially in the accumulator housing (1) and which has two work spaces (5) in the accumulator housing (1) , 7) separates from one another, c) a magnetic arrangement (29) arranged on the separating element (9) and generating a field, and d) a arranged on the outside of the storage housing (1) along the path of the axial movement of the separating element (9) extending row of magnetic field sensors (35) which respond to the field of the magnet arrangement (29) on the separating element (9) in order to identify its position along the row of magnetic field sensors (35).
2. Hydrospeicher nach Anspruch 1 , dadurch gekennzeichnet, dass als Speichergehäuse ein Zylinderrohr (1 ) vorgesehen ist, in dem ein das Trennelement bildender Kolben (9) axial über einen Kolbenhubweg verfahrbar ist, und dass sich die Reihe der Magnetfeldsensoren (35) an der Außenseite des Zylinderrohres (1) im wesentlichen längs des gesamten Hubweges des Kolbens (9) erstreckt.2. Hydraulic accumulator according to claim 1, characterized in that a cylinder tube (1) is provided as the accumulator housing, in which a piston (9) forming the separating element can be moved axially over a piston stroke path, and that the row of magnetic field sensors (35) on the Outside of the cylinder tube (1) extends essentially along the entire stroke of the piston (9).
3. Hydrospeicher nach Anspruch 2, dadurch gekennzeichnet, dass der Kolben (9) aus nicht-magnetisierbarem Werkstoff gebildet ist und dass die Magnetanordnung mehrere um den Umfang des Kolbens (9) verteilt angeordnete Dauermagnete (29) aufweist, die, bezogen auf die Axialrichtung, miteinander fluchtend sind. 3. Hydraulic accumulator according to claim 2, characterized in that the piston (9) is formed from non-magnetizable material and that the magnet arrangement has a plurality of permanent magnets (29) which are distributed around the circumference of the piston (9) and which, based on the axial direction , are in alignment with each other.
. Hydrospeicher nach Anspruch 3, dadurch gekennzeichnet, dass als Magnetfeldsensoren an der Außenseite des Zylinderrohres (1 ) eine Reihe beweglicher, vorzugsweise stäbchenartiger, Dauermagnete (35) vorgesehen ist, von denen solche, die auf das von der Magnetanordnung (29) am Kolben (9) erzeugte Feld ausgerichtet sind, durch dieses in eine Anzeigestellung auslenkbar sind., Hydraulic accumulator according to claim 3, characterized in that a series of movable, preferably rod-like, permanent magnets (35) is provided as magnetic field sensors on the outside of the cylinder tube (1), of which those which are directed to the piston (9) by the magnet arrangement (29) ) generated field are aligned, through this can be deflected into a display position.
5. Hydrospeicher nach Anspruch 4, dadurch gekennzeichnet, dass die stäbchenartigen Dauermagnete (35) für ihre Auslenkbewegung jeweils um Schwenkachsen (37) schwenkbar gelagert sind, die zur Axialrichtung des Zylinderrohres (1 ) senkrecht und zur Richtung der Tangente am benachbarten Umfangsbereich des Zylinderrohres (1) zumindest näherungsweise parallel sind.5. Hydraulic accumulator according to claim 4, characterized in that the rod-like permanent magnets (35) for their deflection movement are each pivotally mounted about pivot axes (37) which are perpendicular to the axial direction of the cylinder tube (1) and to the direction of the tangent to the adjacent peripheral region of the cylinder tube ( 1) are at least approximately parallel.
6. Hydrospeicher nach Anspruch 5, dadurch gekennzeichnet, dass die Schwenkachsen (37) der stäbchenartigen Dauermagnete (35) außerhalb von deren Schwerezentren gelegen sind.6. Hydraulic accumulator according to claim 5, characterized in that the pivot axes (37) of the rod-like permanent magnets (35) are located outside of their centers of gravity.
7. Hydrospeicher nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass als Träger für die Dauermagnete (29) der Magnetanordnung des Kolbens (9) an diesem endseitig ein aus nicht-magnetisierbarem Werkstoff gebildeter Ringkörper (25) angebracht ist, der einen gegenüber dem Innendurchmesser des Zylinder- rohres (1) verringerten Durchmesser besitzt und in dessen zum Zylinderrohr (1 ) konzentrischer Umfangsfläche die Dauermagnete (29) so eingelassen sind, dass sich deren Polachse in Radialrichtung erstreckt. Hydrospeicher nach Anspruch 7, dadurch gekennzeichnet, dass sich die radial außenliegende, bei sämtlichen Dauermagneten (29) gleichnamige Polendfläche (28) in einem geringen Abstand von der Innenwand des Zylinderrohres (1 ) befindet.7. Hydraulic accumulator according to one of claims 3 to 6, characterized in that as a carrier for the permanent magnets (29) of the magnet arrangement of the piston (9) on this end a ring body (25) formed from non-magnetizable material is attached, one opposite has the reduced diameter of the inside diameter of the cylinder tube (1) and the permanent magnets (29) are embedded in the circumferential surface of the cylinder tube (1) so that their polar axis extends in the radial direction. Hydraulic accumulator according to claim 7, characterized in that the radially outer pole end face (28) of the same name in all permanent magnets (29) is located at a short distance from the inner wall of the cylinder tube (1).
Hydrospeicher nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass als Werkstoff für das nicht-magnetisierbare Speichergehäuse (1) Edelstahl, eine Aluminiumlegierung oder ein Kunststoffwerkstoff vorgesehen ist. Hydraulic accumulator according to one of claims 1 to 8, characterized in that stainless steel, an aluminum alloy or a plastic material is provided as the material for the non-magnetizable accumulator housing (1).
EP04704192A 2003-03-11 2004-01-22 Hydraulic accumulator comprising a position indicator Expired - Lifetime EP1601879B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10310427 2003-03-11
DE10310427A DE10310427A1 (en) 2003-03-11 2003-03-11 hydraulic accumulator
PCT/EP2004/000471 WO2004081389A1 (en) 2003-03-11 2004-01-22 Hydraulic accumulator comprising a position indicator

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EP1601879A1 true EP1601879A1 (en) 2005-12-07
EP1601879B1 EP1601879B1 (en) 2008-03-05

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US (1) US7234490B2 (en)
EP (1) EP1601879B1 (en)
AT (1) ATE388329T1 (en)
DE (2) DE10310427A1 (en)
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Publication number Publication date
EP1601879B1 (en) 2008-03-05
DE10310427A1 (en) 2004-09-30
US20060213365A1 (en) 2006-09-28
DE502004006412D1 (en) 2008-04-17
WO2004081389A1 (en) 2004-09-23
US7234490B2 (en) 2007-06-26
ATE388329T1 (en) 2008-03-15

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