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EP0829892A1 - Hydraulic drive - Google Patents

Hydraulic drive Download PDF

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Publication number
EP0829892A1
EP0829892A1 EP97115485A EP97115485A EP0829892A1 EP 0829892 A1 EP0829892 A1 EP 0829892A1 EP 97115485 A EP97115485 A EP 97115485A EP 97115485 A EP97115485 A EP 97115485A EP 0829892 A1 EP0829892 A1 EP 0829892A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic drive
container
pressure
drive according
piston
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
EP97115485A
Other languages
German (de)
French (fr)
Other versions
EP0829892B1 (en
Inventor
Joachim Eggers
Hans-Jürgen Magerkurth
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.)
ABB Patent GmbH
Original Assignee
ABB Patent 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 ABB Patent GmbH filed Critical ABB Patent GmbH
Publication of EP0829892A1 publication Critical patent/EP0829892A1/en
Application granted granted Critical
Publication of EP0829892B1 publication Critical patent/EP0829892B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/34—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator hydraulic

Definitions

  • the invention relates to a hydraulic drive according to the preamble of claim 1.
  • Such a drive is known for example from EP 0 451 724 B1.
  • the energy store consists of a plate spring assembly, the spring force of which acts on a piston which slides in a pressure cylinder and on the side of the pressure fluid chamber opposite the plate spring is provided.
  • the drive piston for the switch is located on the side next to the pressure cylinder, so that this arrangement requires a relatively large amount of space.
  • the hydraulic drive according to EP 0 158 054 B1 requires less space, in which the spring assembly acts with pull rods on a piston through which the drive piston rod engages.
  • the pressure cylinder, the drive piston rod, the drive cylinder chamber and the spring arrangement lie on one axis.
  • the object of the invention is to provide a hydraulic drive of the type mentioned and in which the space utilization is improved.
  • At least two axially extending bores are provided in the container arrangement, in each of which a pressure piston is slidably displaceable, on one end face of which the pressure piece rests and on the other end face of which the pressure fluid is present.
  • the container arrangement can comprise an annular container body which concentrically surrounds the working cylinder.
  • a flange edge can be provided on the working cylinder housing, which engages in a recess on the container body, so that the container body is pressed against the flange edge by the spring arrangement.
  • a pump for generating the pressure fluid can also be installed in the container body.
  • the container arrangement can have a number of container bodies which corresponds to the number of bores.
  • three container bodies are provided, which are attached to the working cylinder in an evenly distributed manner on the circumference thereof.
  • the working cylinder is hexagonal, wherein further components can be attached to the hexagonal surfaces between the container bodies.
  • the embodiment according to the invention offers the advantages of improved space utilization; the spring acts on the pressure piston without tie rods, so that no seals are therefore required in the area of the tie rods.
  • the energy is about one short distance to the working piston; the pressure pistons are practically directly on the working piston.
  • the cylinder body can consist of drawn material or forged material and the individual container bodies for the pressure pistons can be produced from easily machinable aluminum semi-finished products.
  • the hydraulic drive or hydraulic drive 10 has a cylinder body 11 for a working cylinder 12, in which a working piston 13 (also called a driving piston) is guided, to which a driving piston rod 14 connects, with which a high-voltage circuit breaker 15 can be actuated.
  • a working piston 13 also called a driving piston
  • a driving piston rod 14 connects, with which a high-voltage circuit breaker 15 can be actuated.
  • Damping elements 16 and 17 into the areas 18 and 19 and larger diameter than that of the drive piston rod 14 on both sides of the working piston 13 and brake the movement of the working piston 13 at the end of its movement damping.
  • a container body 20 with a larger diameter adjoins the cylinder body 11, in which three bores 21 are accommodated, of which only one bore can be seen. These bores 21 are located on a circle around the central axis MM of the hydraulic drive and are evenly distributed on this circle.
  • a support ring 22 which is fixedly connected to the cylinder housing 11.
  • the cylinder housing 11 is surrounded by a pressure ring 23 which is movably guided on the outer surface of the cylinder housing 11;
  • a spring arrangement 24 is provided between the pressure ring 23 and the support ring 22, which corresponds, for example, to the spring arrangement of the hydraulic device according to EP 0 451 724 B1 and can be designed as a plate spring assembly.
  • Pressure pistons 25 are received in the bores 21 and are moved in the arrow direction D by the spring arrangement 24.
  • a pressure fluid chamber 26 is provided, into which pressure fluid is supplied by a pump 27, which is driven by a motor 28, via a line 29 and the working cylinder 12 and a further line 30, 31, whereby the pressure piston is pressed out of the bore 21 in the opposite direction of the arrow D and thereby tensions the spring arrangement 24.
  • the lines 29, 30, 31 are introduced into the container body 20.
  • the line 30 continues to a P-connection of a reversing valve 32, which has a reversing slide 33, which is actuated by electromagnetic elements A and E in the opening or closing direction.
  • a line 34 which is connected to the T-connection of the valve 32, the pressurized fluid is fed through a filter 35 to a low-pressure tank 36, from where the pressurized fluid is again fed from the pump 27 to the working piston or the working cylinder 12.
  • the line 30 continues into a line 38 which is connected to the P connection of the valve 32; the Z-connection of the valve is connected via a line 39 to the space of the cylinder 12, which is on the side with the larger piston area.
  • the Fig. 1 shows the switch in the off position.
  • the pump 27 and the line 39 also deliver high pressure fluid to both sides of the working piston 13 from the spring arrangement and the pressure pistons with the switch valve 32 in the appropriate position; since the area of the working piston 13 to which the piston rod 14 is connected is smaller than the opposite area, the working piston 13 and the piston rod 14 are moved upward to close the switch 15. If the switch 15 is to be turned off, then a connection between the line 39 and 34 and the low-pressure tank 36 is created via the valve 32, so that the space on the side with the larger piston area is relieved; the pressure fluid in the space with the smaller piston side presses the working piston 13 in the off position.
  • the pressure fluid is provided both by the pump and by the energy storage device, which is formed by the spring arrangement 24 and the three pressure pistons 25 in the bores 21.
  • the pressurized fluid located in the rooms 26 then actuates the working piston 13 in the manner described.
  • Fig. 2 shows a detailed representation of a hydraulic drive in section, without showing the springs.
  • the cylinder body 11 contains the working cylinder 12 and the working or drive piston 13 is guided within the working cylinder 12.
  • the support ring 22 is held on the working cylinder 11 by means of a threaded bush 40 which has a step 41, against which a recess 42 bears against the support ring 22.
  • the threaded bush 40 is screwed onto an external thread 43 of the cylinder body 11.
  • the working cylinder 12 is closed by means of a closure piece 44 which has a blind hole 45 which is part of the working cylinder 12.
  • a plurality of transverse bores 46, 47 are provided in the closure piece 44, into which lines which run parallel to the working cylinder 12 open and which correspond to the lines 39 and 29 and have been given the reference numbers 48 and 49 here.
  • a container body Arranged around the cylinder body 11 at the opposite end is a container body, also called a container 50, which corresponds to the container housing or body 20 and has the bores 21, in each of which a pressure piston 25 is received.
  • a further pressure piece 23 is located between the support piece 22 and the container housing 50, and the spring arrangement 24 (not shown in FIG. 2) is located between them.
  • the end of the cylinder body 11 located at the top of the drawing has an edge 51 which engages in a recess 52 on the container housing 50; when all parts are put together and assembled, a pressure is exerted on the container housing 50 by the spring arrangement via the pressure piece 23, the pressure piston 25 and the pressure fluid, so that this rests against the flange edge 51 and thus the container housing 50 in its location is maintained.
  • the space 26 is connected via a bore 53 to a bore 54 in the cylinder body 11, which are aligned with one another and run radially to the cylinder body 11 and open into the working cylinder 12.
  • the line 48 is connected via a transverse bore 55 to a bore 56 which leads to the Z connection of the changeover valve 32.
  • the other bores that lead to the connections P and T are not shown in FIG. 2.
  • a cover 57 is placed, in which the filter 35 (not shown) is accommodated.
  • the working cylinder 12 is closed on the piston rod side by means of a further closure piece 58, through which the piston rod protrudes outwards and which engages in the cover 57 with the interposition of seals 59.
  • the hydraulic drive 70 has a cylinder body 71, in which a working cylinder 72 is introduced, in which a working piston 73 moves, which corresponds to the working piston 13 in its construction and its mode of operation.
  • the cylinder body 71 is closed at its end remote from the switch, that is to say at the bottom, by a bushing 74 which is held in place by a cover 75.
  • cylinder body 71 has a recess 76, as a result of which a region 77 with a reduced diameter is formed, which has an external thread 78, onto which a cylindrical collar 79 of a sleeve 80 is screwed.
  • the sleeve 80 has two mutually spaced grooves 81 and 82, in which a force transmission member 83 and 83 'engages.
  • the force transmission member 83 or 83 ' interacts with a pressure ring 84, 84' as follows: the force transmission member 83 has a radially inwardly projecting ledge 85 which engages in the groove or groove 81, and a conical surface 86 against which engages a conical surface 87 on the force introduction member 84.
  • the force transmission member 83 is divided into two ring halves that complement one another in the assembled state to form a ring.
  • the conical surfaces 87, 86 are arranged such that the force introduction member 84 (also called the pressure ring) partially concentrically surrounds the force transmission member 83.
  • the pressure ring 84 surrounds the sleeve 80 on its outer surface. The same effect is also achieved with the elements 83 ', 84'.
  • the cylinder body 71 On the cylinder body, specifically in the area of the switch-side end, the cylinder body 71 has a section 88 which forms a hexagonal profile on its outer circumference with six surfaces 89, 90, 91, 92, 93 and 94. In FIG. 3 the surface is 92 visible.
  • Container surfaces 95, 97 and 99 are fastened to surfaces 90, 92 and 94 with screw connections 96, 98 and 100, respectively.
  • the container body 95, 97 and 99 are constructed identically, so that it is sufficient to show the container body 95 with reference to FIG. 3.
  • the container body 95 is pot-shaped with a pot bottom 101 and a wall 102 which is cylindrical on the inside and, as can be seen in FIG. 4, is rectangular or square on the outside.
  • a bore 103 is made in the wall, in which a pressure piston 104 is slidably guided.
  • the open side of the container body 95 points towards the end remote from the switch and is tightly closed by means of a cover 105.
  • the cover 105 has a bore 106 through which a piston rod 107, which is integrally connected to the pressure piston 104, projects.
  • the cylinder body 71 is surrounded by a pressure body 108 which has a radial stop surface 109; there is a plate spring arrangement between the pressure ring 84 and the pressure body 108.
  • the pressure body 108 engages over the piston rod 107, so that when the pressure piston is pressed out of the container body 95, the latter clamps the spring arrangement via the pressure body 108.
  • the pressure body 108 can now be a ring; there is also the possibility that it has an annular section in the central region, on which arms are formed which overlap the piston rods 107 of all three container bodies.
  • the three container bodies 95, 97 and 99 are arranged in a star shape on the cylinder body 71 in the region 88 thereof; in between further hydraulic components can be formed on the respective surfaces 91, 93 and 95.
  • a changeover valve 110 is fastened to the side surface 91, a path detection 111 to the side surface 93 and a low-pressure drinking pump arrangement 112 to the surface 89 (this is only given as an example).

Landscapes

  • Actuator (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The hydraulic drive comprises a working cylinder (12) in which a working piston (13) is movable and a spring storage arrangement (24) containing storage energy, with fluid under pressure in a container (20). The spring storage arrangement (24) supports an end of the cylinder housing (11) and with its other end being movable. The working cylinder housing acts upon the surrounding pressure piece (23). The container surrounding the working cylinder housing includes at least two axially running holes (21), in each of which a pressure piston (25) is slidably adjustable, on which a end face of the pressure piece (23) lies and on the other end face fluid under pressure is present.

Description

Die Erfindung betrifft einen hydraulischen Antrieb gemäß dem Oberbegriff des Anspruches 1.The invention relates to a hydraulic drive according to the preamble of claim 1.

Ein solcher Antrieb ist beispielsweise aus der EP 0 451 724 B1 bekannt. Der Energiespeicher besteht bei diesem Antrieb aus einem Tellerfederpaket, dessen Federkraft auf einen Kolben wirkt, der in einem Druckzylinder gleitet und auf dessen der Tellerfeder entgegengesetzten Seite der Druckfluidraum vorgesehen ist. Der Antriebskolben für den Schalter befindet sich seitlich neben dem Druckzylinder, so daß diese Anordnung einen relativ großen Platzbedarf besitzt.Such a drive is known for example from EP 0 451 724 B1. In this drive, the energy store consists of a plate spring assembly, the spring force of which acts on a piston which slides in a pressure cylinder and on the side of the pressure fluid chamber opposite the plate spring is provided. The drive piston for the switch is located on the side next to the pressure cylinder, so that this arrangement requires a relatively large amount of space.

Einen geringeren Platzbedarf benötigt der hydraulische Antrieb nach der EP 0 158 054 B1, bei dem das Federpaket mit Zugstangen auf einen Kolben einwirkt, durch den die Antriebskolbenstange hindurchgreift. Der Druckzylinder, die Antriebskolbenstange, der Antriebszylinderraum und die Federanordnugn liegen auf einer Achse.The hydraulic drive according to EP 0 158 054 B1 requires less space, in which the spring assembly acts with pull rods on a piston through which the drive piston rod engages. The pressure cylinder, the drive piston rod, the drive cylinder chamber and the spring arrangement lie on one axis.

Aufgabe der Erfindung ist es, einen hydraulischen Antrieb der eingangs genannten Art zu schaffen und bei dem die Raumausnutzung verbessert ist.The object of the invention is to provide a hydraulic drive of the type mentioned and in which the space utilization is improved.

Diese Aufgabe wird erfindungsgemäß gelöst durch die kennzeichnenden Merkmale des Anspruches 1.This object is achieved according to the invention by the characterizing features of claim 1.

Erfindungsgemäß sind in der Behälteranordnung wenigstens zwei axial verlaufende Bohrungen vorgesehen, in denen je ein Druckkolben gleitend verschiebbar ist, an deren einen Stirnfläche das Druckstück anliegt und an deren anderer Stirnfläche das Druckfluid ansteht.According to the invention, at least two axially extending bores are provided in the container arrangement, in each of which a pressure piston is slidably displaceable, on one end face of which the pressure piece rests and on the other end face of which the pressure fluid is present.

In besonders vorteilhafter Weise sind drei axial verlaufende Bohrungen vorgesehen, in denen die Druckkolben gleiten.In a particularly advantageous manner, three axially extending bores are provided, in which the pressure pistons slide.

Gemäß einer ersten Ausführungsform der Erfindung kann die Behälteranordnung einen ringförmigen Behälterkörper umfassen, der den Arbeitszylinder konzentrisch umgibt.According to a first embodiment of the invention, the container arrangement can comprise an annular container body which concentrically surrounds the working cylinder.

Zur Fixierung kann am Arbeitszylindergehäuse ein Flanschrand vorgesehen sein, der in einen Rücksprung am Behälterkörper eingreift, so daß durch die Federanordnung der Behälterkörper gegen den Flanschrand gedrückt ist.For fixing, a flange edge can be provided on the working cylinder housing, which engages in a recess on the container body, so that the container body is pressed against the flange edge by the spring arrangement.

In dem Behälterkörper kann dabei auch eine Pumpe zur Erzeugung des Druckfluids eingebaut sein.A pump for generating the pressure fluid can also be installed in the container body.

Gemäß einer weiteren Ausführungsform der Erfindung kann die Behälteranordnung eine Anzahl von Behälterkörpern aufweisen, die der Anzahl der Bohrungen entspricht. Bei drei Bohrungen sind drei Behälterkörper vorgesehen, die gleichmäßig am Umfang des Arbeitszylinders verteilt an diesem befestigt sind.According to a further embodiment of the invention, the container arrangement can have a number of container bodies which corresponds to the number of bores. In the case of three bores, three container bodies are provided, which are attached to the working cylinder in an evenly distributed manner on the circumference thereof.

Dabei besteht die Möglichkeit, daß der Arbeitszylinder sechseckig ausgebildet ist, wobei an den Sechseckflächen zwischen den Behälterkörpern weitere Komponenten befestigt werden können.There is the possibility that the working cylinder is hexagonal, wherein further components can be attached to the hexagonal surfaces between the container bodies.

Die erfindungsgemäße Ausführung bietet die Vorteile einer verbesserten Raumausnutzung; die Feder wirkt zugankerlos auf die Druckkolben, so daß deshalb auch keine Dichtungen erforderlich sind im Bereich der Zuganker. Die Energie wird über einen kurzen Weg dem Arbeitskolben zugeführt; die Druckkolben liegen praktisch direkt am Arbeitskolben.The embodiment according to the invention offers the advantages of improved space utilization; the spring acts on the pressure piston without tie rods, so that no seals are therefore required in the area of the tie rods. The energy is about one short distance to the working piston; the pressure pistons are practically directly on the working piston.

Darüberhinaus werden die Montage- und evtl. Revisionsarbeiten erleichtert, da insbesondere dann, wenn mehrere Behälterkörper vorgesehen sind, aufgrund der Modulbauweise leichte Auswechselmöglichkeiten bestehen. Der Zylinderkörper kann aus gezogenem Material oder Schmiedematerial bestehen und die einzelnen Behälterkörper für die Druckkolben können aus leicht bearbeitbarem Aluminium-Halbzeug hergestellt werden.In addition, the assembly and possibly revision work are made easier, since in particular if several container bodies are provided, there are easy replacement options due to the modular design. The cylinder body can consist of drawn material or forged material and the individual container bodies for the pressure pistons can be produced from easily machinable aluminum semi-finished products.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den weiteren Unteransprüchen.Further advantageous embodiments of the invention result from the further subclaims.

Anhand der Zeichnung, in der zwei Ausführungsbeispiele der Erfindung dargestellt sind, sollen die Erfindung sowie weitere vorteilhafte Ausgestaltungen und Verbesserungen der Erfindung näher erläutert und beschrieben werden.The invention and further advantageous refinements and improvements of the invention are to be explained and described in more detail with reference to the drawing, in which two exemplary embodiments of the invention are shown.

Es zeigen:

Fig. 1
eine schematische Darstellung des Hydraulikantriebes,
Fig. 2
eine Schnittansicht durch einen Hydraulikantrieb entsprechend der Ausführung gemäß Fig. 1,
Fig. 3
eine Schnittansicht einer weiteren Ausführungsform der Erfindung, und
Fig. 4
eine Aufsicht auf die Anordnung gemäß Pfeilrichtung IV.
Show it:
Fig. 1
a schematic representation of the hydraulic drive,
Fig. 2
2 shows a sectional view through a hydraulic drive corresponding to the embodiment according to FIG. 1,
Fig. 3
a sectional view of a further embodiment of the invention, and
Fig. 4
a supervision of the arrangement according to arrow direction IV.

Der hydraulische Antrieb oder Hydraulikantrieb 10 besitzt einen Zylinderkörper 11 für einen Arbeitszylinder 12, in dem ein Arbeitskolben 13 (auch Antriebskolben genannt) geführt ist, an dem sich eine Antriebskolbenstange 14 anschließt, mit dem ein Hochspannungsleistungsschalter 15 betätigt werden kann. Am Ende und am Anfang des Bewegungsweges des Antriebskolbens 13 oder Arbeitskolbens 13 befinden sich Dämpfungselemente 16 und 17, in die Bereiche 18 und 19 und größerem Durchmesser als der der Antriebskolbenstange 14 beidseitig des Arbeitskolbens 13 hineinfahren und die Bewegung des Arbeitskolbens 13 am Ende seiner Bewegung dämpfend abbremsen. An dem Zylinderkörper 11 schließt sich ein Behälterkörper 20 mit größerem Durchmesser an, in dem drei Bohrungen 21 untergebracht sind, von denen lediglich eine Bohrung zu sehen ist. Diese Bohrungen 21 befinden sich auf einem Kreis um die Mittelachse M-M des Hydraulikantriebes und sind auf diesem Kreis gleichmäßig verteilt.The hydraulic drive or hydraulic drive 10 has a cylinder body 11 for a working cylinder 12, in which a working piston 13 (also called a driving piston) is guided, to which a driving piston rod 14 connects, with which a high-voltage circuit breaker 15 can be actuated. At the end and at the beginning of the path of movement of the drive piston 13 or working piston 13 are located Damping elements 16 and 17, into the areas 18 and 19 and larger diameter than that of the drive piston rod 14 on both sides of the working piston 13 and brake the movement of the working piston 13 at the end of its movement damping. A container body 20 with a larger diameter adjoins the cylinder body 11, in which three bores 21 are accommodated, of which only one bore can be seen. These bores 21 are located on a circle around the central axis MM of the hydraulic drive and are evenly distributed on this circle.

An dem freien Ende des Zylinderkörpers oder -gehäuses 11 befindet sich ein Abstützring 22, der mit dem Zylindergehäuse 11 fest verbunden ist. Das Zylindergehäuse 11 wird von einem Druckring 23 umgeben, der beweglich auf der Außenfläche des Zylindergehäuses 11 geführt ist; zwischen dem Druckring 23 und dem Abstützring 22 ist eine Federanordnung 24 vorgesehen, die beispielsweise der Federanordnung der Hydraulikeinrichtung nach der EP 0 451 724 B1 entspricht und als Tellerfederpaket ausgebildet sein kann.At the free end of the cylinder body or housing 11 there is a support ring 22 which is fixedly connected to the cylinder housing 11. The cylinder housing 11 is surrounded by a pressure ring 23 which is movably guided on the outer surface of the cylinder housing 11; A spring arrangement 24 is provided between the pressure ring 23 and the support ring 22, which corresponds, for example, to the spring arrangement of the hydraulic device according to EP 0 451 724 B1 and can be designed as a plate spring assembly.

In den Bohrungen 21 sind Druckkolben 25 aufgenommen, die von der Federanordnung 24 in Pfeilrichtung D bewegt werden. Auf der dem Druckring 23 entgegengesetzten Seite jedes Druckkolbens ist ein Druckfluidraum 26 vorgesehen, in den von einer Pumpe 27, die von einem Motor 28 angetrieben wird, über eine Leitung 29 und den Arbeitszylinder 12 sowie eine weitere Leitung 30, 31 Druckfluid zugeführt wird, wodurch der Druckkolben entgegen der Pfeilrichtung D aus der Bohrung 21 herausgedrückt wird und dabei die Federanordnung 24 spannt. Die Leitungen 29, 30, 31 sind in den Behälterkörper 20 eingebracht. Die Leitung 30 setzt sich fort zu einem P-Anschluß eines Umsteuerventils 32, das einen Umsteuerschieber 33 besitzt, der von Elektromagnetelementen A und E in Ausschalt- bzw. Einschaltrichtung betätigt wird. Über eine Leitung 34, die mit dem T-Anschluß des Ventils 32 verbunden ist, wird das Druckfluid durch einen Filter 35 einem Niederdrucktank 36 zugeführt, von wo das Druckfluid von der Pumpe 27 wieder dem Arbeitskolben bzw. dem Arbeitszylinder 12 zugeführt wird. Die Leitung 30 setzt sich fort in eine Leitung 38, die mit dem P-Anschluß des Ventiles 32 verbunden ist; der Z-Anschluß des Ventiles ist über eine Leitung 39 mit dem Raum des Zylinders 12 verbunden, der auf der Seite mit der größeren Kolbenfläche liegt. Die Fig. 1 zeigt den Schalter in Ausschaltstellung. Wenn der Schalter 15 in Einschaltstellung verbracht werden soll, dann wird über die Pumpe 27 und die Leitung 39 auch von der Federanordnung und die Druckkolben bei entsprechender Stellung des Umschaltventils 32 Hochdruckfluid auf beide Seiten des Arbeitskolbens 13 gefördert; da die Fläche des Arbeitskolbens 13, an der die Kolbenstange 14 anschließt, kleiner ist als die entgegengesetzte Fläche, wird der Arbeitskolben 13 und die Kolbenstange 14 nach oben zum Schließen des Schalters 15 bewegt. Wenn der Schalter 15 ausgeschaltet werden soll, dann wird über das Ventil 32 eine Verbindung zwischen der Leitung 39 und 34 und dem Niederdrucktank 36 geschaffen, so daß der Raum, der auf der Seite mit der größeren Kolbenfläche liegt, entlastet wird; das Druckfluid in dem Raum mit der kleineren Kolbenseite drückt den Arbeitskolben 13 in Ausschaltstellung.Pressure pistons 25 are received in the bores 21 and are moved in the arrow direction D by the spring arrangement 24. On the side of each pressure piston opposite the pressure ring 23, a pressure fluid chamber 26 is provided, into which pressure fluid is supplied by a pump 27, which is driven by a motor 28, via a line 29 and the working cylinder 12 and a further line 30, 31, whereby the pressure piston is pressed out of the bore 21 in the opposite direction of the arrow D and thereby tensions the spring arrangement 24. The lines 29, 30, 31 are introduced into the container body 20. The line 30 continues to a P-connection of a reversing valve 32, which has a reversing slide 33, which is actuated by electromagnetic elements A and E in the opening or closing direction. Via a line 34, which is connected to the T-connection of the valve 32, the pressurized fluid is fed through a filter 35 to a low-pressure tank 36, from where the pressurized fluid is again fed from the pump 27 to the working piston or the working cylinder 12. The line 30 continues into a line 38 which is connected to the P connection of the valve 32; the Z-connection of the valve is connected via a line 39 to the space of the cylinder 12, which is on the side with the larger piston area. The Fig. 1 shows the switch in the off position. If the switch 15 is to be brought into the on position, then the pump 27 and the line 39 also deliver high pressure fluid to both sides of the working piston 13 from the spring arrangement and the pressure pistons with the switch valve 32 in the appropriate position; since the area of the working piston 13 to which the piston rod 14 is connected is smaller than the opposite area, the working piston 13 and the piston rod 14 are moved upward to close the switch 15. If the switch 15 is to be turned off, then a connection between the line 39 and 34 and the low-pressure tank 36 is created via the valve 32, so that the space on the side with the larger piston area is relieved; the pressure fluid in the space with the smaller piston side presses the working piston 13 in the off position.

Das Druckfluid wird sowohl von der Pumpe als auch von der Energiespeichereinrichtung bereitgestellt, die durch die Federanordnung 24 sowie die drei Druckkolben 25 in den Bohrungen 21 gebildet ist. Das in den Räumen 26 sich befindliche Druckfluid betätigt dann in beschriebener Weise den Arbeitskolben 13.The pressure fluid is provided both by the pump and by the energy storage device, which is formed by the spring arrangement 24 and the three pressure pistons 25 in the bores 21. The pressurized fluid located in the rooms 26 then actuates the working piston 13 in the manner described.

Die Fig. 2 zeigt eine detaillierte Darstellung eines Hydraulikantriebes im Schnitt, ohne Darstellung der Federn.Fig. 2 shows a detailed representation of a hydraulic drive in section, without showing the springs.

Der Zylinderkörper 11 enthält den Arbeitszylinder 12 und innerhalb des Arbeitszylinders 12 ist der Arbeits- bzw. Antriebskolben 13 geführt. Der Abstützring 22 ist am Arbeitszylinder 11 mittels einer Gewindebuchse 40 gehalten, die eine Stufung 41 aufweist, gegen den sich ein Rücksprung 42 am Abstützring 22 anlegt. Die Gewindebuchse 40 ist auf ein Außengewinde 43 des Zylinderkörpers 11 aufgeschraubt.The cylinder body 11 contains the working cylinder 12 and the working or drive piston 13 is guided within the working cylinder 12. The support ring 22 is held on the working cylinder 11 by means of a threaded bush 40 which has a step 41, against which a recess 42 bears against the support ring 22. The threaded bush 40 is screwed onto an external thread 43 of the cylinder body 11.

Der Arbeitszylinder 12 ist mittels eines Verschlußstückes 44 verschlossen, das eine Sacklochbohrung 45 aufweist, die Teil des Arbeitszylinders 12 ist. In dem Verschlußstück 44 sind mehrere Querbohrungen 46, 47 vorgesehen, in die parallel zum Arbeitszylinder 12 verlaufende Leitungen einmünden, die den Leitungen 39 bzw. 29 entsprechen und hier die Bezugsziffern 48 und 49 erhalten haben.The working cylinder 12 is closed by means of a closure piece 44 which has a blind hole 45 which is part of the working cylinder 12. A plurality of transverse bores 46, 47 are provided in the closure piece 44, into which lines which run parallel to the working cylinder 12 open and which correspond to the lines 39 and 29 and have been given the reference numbers 48 and 49 here.

Um den Zylinderkörper 11 herum ist an dem entgegengesetzten Ende ein Behälterkörper, auch Behälter 50 genannt, angeordnet, das dem Behältergehäuse oder -körper 20 entspricht und die Bohrungen 21 aufweist, in denen je ein Druckkolben 25 aufgenommen ist. Zwischen dem Abstützstück 22 und dem Behältergehäuse 50 befindet sich ein weiteres Druckstück 23, und dazwischen befindet sich die Federanordnung 24 (in Fig. 2 nicht gezeigt).Arranged around the cylinder body 11 at the opposite end is a container body, also called a container 50, which corresponds to the container housing or body 20 and has the bores 21, in each of which a pressure piston 25 is received. A further pressure piece 23 is located between the support piece 22 and the container housing 50, and the spring arrangement 24 (not shown in FIG. 2) is located between them.

Das in der Zeichnung oben befindliche Ende des Zylinderkörpers 11 besitzt einen Randbord 51 der in einen Rücksprung 52 am Behältergehäuse 50 eingreift; wenn alle Teile miteinander zusammengesteckt und montiert sind, wird von der Federanordnung über das Druckstück 23, die Druckkolben 25 und das Druckfluid ein Druck auf das Behältergehäuse 50 ausgeübt, so daß sich dieses mit seinem Rücksprung gegen den Flanschrand 51 anlegt und so das Behältergehäuse 50 in seiner Lage gehalten ist.The end of the cylinder body 11 located at the top of the drawing has an edge 51 which engages in a recess 52 on the container housing 50; when all parts are put together and assembled, a pressure is exerted on the container housing 50 by the spring arrangement via the pressure piece 23, the pressure piston 25 and the pressure fluid, so that this rests against the flange edge 51 and thus the container housing 50 in its location is maintained.

Der Raum 26 ist über eine Bohrung 53 mit einer Bohrung 54 im Zylinderkörper 11 verbunden, die miteinander fluchten und radial zu dem Zylinderkörper 11 verlaufen und in den Arbeitszylinder 12 einmünden. Die Leitung 48 ist über eine Querbohrung 55 mit einer Bohrung 56 verbunden, die zum Z-Anschluß des Umschaltventils 32 führt. Die anderen Bohrungen, die zu den Anschlüssen P und T führen, sind in der Fig. 2 nicht dargestellt.The space 26 is connected via a bore 53 to a bore 54 in the cylinder body 11, which are aligned with one another and run radially to the cylinder body 11 and open into the working cylinder 12. The line 48 is connected via a transverse bore 55 to a bore 56 which leads to the Z connection of the changeover valve 32. The other bores that lead to the connections P and T are not shown in FIG. 2.

Auf die freie Außenfläche des Behältergehäuses 50 ist ein Deckel 57 aufgesetzt, in dem (nicht gezeigt) das Filter 35 untergebracht ist.On the free outer surface of the container housing 50, a cover 57 is placed, in which the filter 35 (not shown) is accommodated.

Der Arbeitszylinder 12 ist kolbenstangenseitig mittels eines weiteren Verschlußstückes 58 verschlossen, durch welches die Kolbenstange nach außen herausragt und welches in den Deckel 57 unter Zwischenfügung von Dichtungen 59 eingreift.The working cylinder 12 is closed on the piston rod side by means of a further closure piece 58, through which the piston rod protrudes outwards and which engages in the cover 57 with the interposition of seals 59.

Der hydraulische Antrieb 70 gemäß der Fig. 3 besitzt einen Zylinderkörper 71, in dem ein Arbeitszylinder 72 eingebracht ist, in dem sich ein Arbeitskolben 73 bewegt, der in seinem Aufbau und seiner Arbeitsweise dem Arbeitskolben 13 entspricht. Der Zylinderkörper 71 ist an seinem schalterabseitigen, also unten befindlichen Ende mit einer Buchse 74 verschlossen, die mit einem Deckel 75 festgehalten ist. Im Bereich der Buchse 74, also am schalterabseitigen Ende, besitzt der Zylinderkörper 71 einen Rücksprung 76, wodurch ein Bereich 77 mit verringertem Durchmesser gebildet ist, der ein Außengewinde 78 aufweist, auf das ein zylinderförmiger Kragen 79 einer Hülse 80 aufgeschraubt ist. Die Hülse 80 besitzt zwei in Abstand zueinander angeordnete Nuten 81 und 82, in die ein Kraftübertragungsglied 83 bzw. 83' eingreift. Das Kraftübertragungsglied 83 bzw. 83' wirkt mit einem Druckring 84, 84' zusammen und zwar wie folgt: das Kraftübertragungsglied 83 besitzt eine radial nach innen vorspringende Leiste 85, die in die Rille bzw. Nut 81 eingreift, sowie eine konusförmige Fläche 86, gegen die eine Konusfläche 87 am Krafteinleitungsglied 84 angreift. Aus Montagegründen ist das Kraftübertragungsglied 83 geteilt und zwar in zwei Ringhälften, die sich im montierten Zustand zu einem Ring ergänzen. Die Konusflächen 87, 86 sind so angeordnet, daß das Krafteinleitungsglied 84 (auch Druckring genannt) das Kraftübertragungsglied 83 teilweise konzentrisch umgibt. Der Druckring 84 umgibt die Hülse 80 an ihrer Außenfläche. Die gleiche Wirkung wird auch mit den Elementen 83', 84' erreicht.The hydraulic drive 70 according to FIG. 3 has a cylinder body 71, in which a working cylinder 72 is introduced, in which a working piston 73 moves, which corresponds to the working piston 13 in its construction and its mode of operation. The cylinder body 71 is closed at its end remote from the switch, that is to say at the bottom, by a bushing 74 which is held in place by a cover 75. In the field of Bushing 74, that is to say at the switch-side end, cylinder body 71 has a recess 76, as a result of which a region 77 with a reduced diameter is formed, which has an external thread 78, onto which a cylindrical collar 79 of a sleeve 80 is screwed. The sleeve 80 has two mutually spaced grooves 81 and 82, in which a force transmission member 83 and 83 'engages. The force transmission member 83 or 83 'interacts with a pressure ring 84, 84' as follows: the force transmission member 83 has a radially inwardly projecting ledge 85 which engages in the groove or groove 81, and a conical surface 86 against which engages a conical surface 87 on the force introduction member 84. For reasons of assembly, the force transmission member 83 is divided into two ring halves that complement one another in the assembled state to form a ring. The conical surfaces 87, 86 are arranged such that the force introduction member 84 (also called the pressure ring) partially concentrically surrounds the force transmission member 83. The pressure ring 84 surrounds the sleeve 80 on its outer surface. The same effect is also achieved with the elements 83 ', 84'.

An dem Zylinderkörper, und zwar im Bereich des schalterseitigen Endes besitzt der Zylinderkörper 71 einen Abschnitt 88, der an seinem Außenumfang ein Sechseckprofil bildet mit sechs Flächen 89, 90, 91, 92, 93 und 94. In der Fig. 3 ist die Fläche 92 sichtbar. An den Flächen 90, 92 und 94 sind Behälterkörper 95, 97 und 99 jeweils mit Schraubverbindungen 96, 98 und 100 befestigt. Die Behälterkörper 95, 97 und 99 sind gleich aufgebaut, so daß es ausreicht, den Behälterkörper 95 anhand der Fig. 3 darzustellen. Der Behälterkörper 95 ist topfförmig ausgebildet mit einem Topfboden 101 und einer Wand 102, die innen zylindrisch und, wie aus Fig. 4 ersichtlich, am Außenbereich rechteckig bzw. quadratisch ist. Innerhalb der Wand ist eine Bohrung 103 eingebracht, in der ein Druckkolben 104 gleitend geführt ist. Die offene Seite des Behälterkörpers 95 weist zum schalterabseitigen Ende hin und ist mittels eines Deckels 105 dicht verschlossen. Der Deckel 105 besitzt eine Bohrung 106, durch die eine Kolbenstange 107, die mit dem Druckkolben 104 einstückig verbunden ist, hindurchragt.On the cylinder body, specifically in the area of the switch-side end, the cylinder body 71 has a section 88 which forms a hexagonal profile on its outer circumference with six surfaces 89, 90, 91, 92, 93 and 94. In FIG. 3 the surface is 92 visible. Container surfaces 95, 97 and 99 are fastened to surfaces 90, 92 and 94 with screw connections 96, 98 and 100, respectively. The container body 95, 97 and 99 are constructed identically, so that it is sufficient to show the container body 95 with reference to FIG. 3. The container body 95 is pot-shaped with a pot bottom 101 and a wall 102 which is cylindrical on the inside and, as can be seen in FIG. 4, is rectangular or square on the outside. A bore 103 is made in the wall, in which a pressure piston 104 is slidably guided. The open side of the container body 95 points towards the end remote from the switch and is tightly closed by means of a cover 105. The cover 105 has a bore 106 through which a piston rod 107, which is integrally connected to the pressure piston 104, projects.

Der Zylinderkörper 71 ist von einem Druckkörper 108 umgeben, der eine radiale Anschlagfläche 109 aufweist; zwischen dem Druckring 84 und dem Druckkörper 108 befindet sich eine Tellerfederanordnung. Der Druckkörper 108 übergreift die Kolbenstange 107, so daß dann, wenn der Druckkolben aus dem Behälterkörper 95 herausgedrückt wird, dieser über den Druckkörper 108 die Federanordnung spannt.The cylinder body 71 is surrounded by a pressure body 108 which has a radial stop surface 109; there is a plate spring arrangement between the pressure ring 84 and the pressure body 108. The pressure body 108 engages over the piston rod 107, so that when the pressure piston is pressed out of the container body 95, the latter clamps the spring arrangement via the pressure body 108.

Der Druckkörper 108 kann nun ein Ring sein; es besteht auch die Möglichkeit, daß er einen ringförmigen Abschnitt im mittleren Bereich aufweist, an dem Arme angeformt sind, die die Kolbenstangen 107 aller drei Behälterkörper übergreifen.The pressure body 108 can now be a ring; there is also the possibility that it has an annular section in the central region, on which arms are formed which overlap the piston rods 107 of all three container bodies.

Die drei Behälterkörper 95, 97 und 99 sind sternförmig am Zylinderkörper 71 in dessen Bereich 88 angeordnet; dazwischen können an den jeweiligen Flächen 91, 93 und 95 weitere Hydraulikkomponenten angeformt sein. So ist an der Seitenfläche 91 ein Umschaltventil 110 befestigt, an der Seitenfläche 93 eine Wegerfassung 111 und an der Fläche 89 eine Niederdrucktrankpumpanordnung 112 (das ist nur beispielhaft angegeben).The three container bodies 95, 97 and 99 are arranged in a star shape on the cylinder body 71 in the region 88 thereof; in between further hydraulic components can be formed on the respective surfaces 91, 93 and 95. Thus, a changeover valve 110 is fastened to the side surface 91, a path detection 111 to the side surface 93 and a low-pressure drinking pump arrangement 112 to the surface 89 (this is only given as an example).

Auf diese Weise ist ein Hydraulikantrieb einfach aufzubauen. Die einzelnen Druckkolben sind in demontierbaren Behälterkörpern untergebracht und insgesamt ist die Anordnung gemäß den Fig. 3 und 4 einfach und modular aufgebaut, so daß die Montage und Revisionen einfach auszuführen sind.In this way, a hydraulic drive is easy to set up. The individual pressure pistons are housed in removable container bodies and overall the arrangement according to FIGS. 3 and 4 is simple and modular, so that the assembly and revisions are easy to carry out.

Ergänzend sei noch ausgeführt, daß am schalterseitigen Ende der Arbeitszylinder 72 mit einer Buchse 115 verschlossen ist, durch die die Kolbenstange 73' des Arbeitskolbens 73 herausragt. Weiterhin ist ein Abschlußdeckel 116 vorgesehen, der als Niederdrucktank dient. In gleicher Weise sind innerhalb des Zylinderkörpers 71 Quer- und Längsbohrungen 117 und 118 vorgesehen, die als Druckfluidleitungen dienen.In addition, it should also be stated that at the switch end of the working cylinder 72 is closed with a bush 115 through which the piston rod 73 'of the working piston 73 protrudes. Furthermore, an end cover 116 is provided, which serves as a low-pressure tank. In the same way, 71 transverse and longitudinal bores 117 and 118 are provided within the cylinder body, which serve as pressurized fluid lines.

Die Anordnung mit dem Druckring 84 und dem Kraftübertragungsglied 83 ist näher in der DE           (Mp.-Nr. 96/663) der Anmelderin beschrieben.The arrangement with the pressure ring 84 and the force transmission member 83 is closer in DE            (Mp.No. 96/663) by the applicant.

Claims (11)

Hydraulischer Antrieb insbesondere für einen Hochspannungsleistungsschalter, mit einem Arbeitszylinder (12), in dem ein Arbeitskolben (13) bewegbar ist, und mit einem eine Speicherfederanordnung (24) enthaltenden Energiespeicher, mit dem in einer Behälteranordnung (20) befindliches Fluid unter Druck gesetzt wird, wobei die Speicherfederanordnung (24) mit einem Ende sich am Zylindergehäuse (11) abstützt und mit ihrem anderen Ende auf ein bewegliches, das Arbeitszylindergehäuse (11) ebenfalls umgebendes Druckstück (23) einwirkt, dadurch gekennzeichnet, daß die ebenfalls das Arbeitszylindergehäuse (11) umgebende Behälteranordnung (20) wenigstens zwei axial verlaufende Bohrungen (21) umfaßt, in denen je ein Druckkolben (25) gleitend verschiebbar sind, an deren einer Stirnfläche das Druckstück (23) anliegt und an deren anderer Stirnfläche das Druckfluid ansteht.Hydraulic drive, in particular for a high-voltage circuit breaker, with a working cylinder (12) in which a working piston (13) can be moved, and with an energy storage device containing a storage spring arrangement (24), with which fluid in a container arrangement (20) is pressurized, wherein the storage spring arrangement (24) is supported at one end on the cylinder housing (11) and acts at its other end on a movable pressure piece (23) which also surrounds the working cylinder housing (11), characterized in that the one likewise surrounding the working cylinder housing (11) Container arrangement (20) comprises at least two axially extending bores (21), in each of which a pressure piston (25) is slidably displaceable, on one end face of which the pressure piece (23) rests and on the other end face of which the pressurized fluid is present. Hydraulischer Antrieb nach Anspruch 1, dadurch gekennzeichnet, daß drei Bohrungen mit jeweils einem Druckkolben vorgesehen sind.Hydraulic drive according to claim 1, characterized in that three bores are provided, each with a pressure piston. Hydraulischer Antrieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Behälteranordnung einen ringförmigen Behälterkörper (20) umfaßt, der den Arbeitszylinder (11) konzentrisch umgibt.Hydraulic drive according to claim 1 or 2, characterized in that the container arrangement comprises an annular container body (20) which concentrically surrounds the working cylinder (11). Hydraulischer Antrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß am Arbeitszylindergehäuse (11) ein Flanschrand (51) vorgesehen ist, der in einen Rücksprung (52) am Behälterkörper (50) eingreift, so daß durch die Federanordnung (24) der Behälterkörper (50) gegen den Flanschrand (51) gedrückt ist.Hydraulic drive according to one of the preceding claims, characterized in that a flange edge (51) is provided on the working cylinder housing (11) and engages in a recess (52) on the container body (50) so that the container body () 50) is pressed against the flange edge (51). Hydraulischer Antrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß in dem Behälterkörper (50) eine Pumpe (27) zur Erzeugung des Druckfluids eingebaut ist.Hydraulic drive according to one of the preceding claims, characterized in that a pump (27) for generating the pressure fluid is installed in the container body (50). Hydraulischer Antrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß an der Außenseite des Behälterkörpers (50) eine Umschaltventil (32) befestigt ist, und daß die Pumpe mit den Bohrungen (21), dem Umschaltventil (32) sowie mit dem Zylinderraum (12) auf beiden Seiten des Kolbens (13) über im Arbeitszylindergehäuse (11) und im Behältergehäuse (50) vorgesehene Bohrungen verbunden ist.Hydraulic drive according to one of the preceding claims, characterized in that a changeover valve (32) is attached to the outside of the container body (50), and in that the pump with the bores (21), the changeover valve (32) and the cylinder space (12 ) is connected on both sides of the piston (13) via bores provided in the working cylinder housing (11) and in the container housing (50). Hydraulischer Antrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß auf der Seite des Behälterkörpers (50), die etwa mit dem freien Ende des Arbeitszylinders (11) fluchtet, ein Deckel (57) befestigt ist.Hydraulic drive according to one of the preceding claims, characterized in that a cover (57) is attached to the side of the container body (50) which is approximately aligned with the free end of the working cylinder (11). Hydraulischer Antrieb nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Behälteranordnung eine Anzahl von der Anzahl der Bohrungen (13) entsprechenden Behälterkörpern (95, 99, 110) umfaßt, die jeweils eine Bohrung aufweisen und die gleichmäßig am Umfang des Zylinderkörpers (71) verteilt an diesen befestigt sind.Hydraulic drive according to one of claims 1 and 2, characterized in that the container arrangement comprises a number of container bodies (95, 99, 110) corresponding to the number of bores (13), each of which has a bore and which is uniform on the circumference of the cylinder body ( 71) are attached to these distributed. Hydraulischer Antrieb nach Anspruch 8, dadurch gekennzeichnet, daß die Berührungsfläche zwischen jedem Behälterkörper (95, 99, 110) eben ist und axial am Zylinderkörper (71) verläuft.Hydraulic drive according to claim 8, characterized in that the contact surface between each container body (95, 99, 110) is flat and extends axially on the cylinder body (71). Hydraulischer Antrieb nach einem der Ansprüche 8 und 9, dadurch gekennzeichnet, daß der Zylinderkörper (71) im Bereich der Behälterkörper (95, 99, 110) sechseckig ausgebildet ist, und daß an den Sechseckflächen des Zylinderkörpers (71), die zwischen den Behälterkörpern (95, 99, 110) liegen, weitere Hydraulikkomponenten wie Umschaltventil, Niederdrucktankpumpenvorrichtung und dgl. befestigt sind.Hydraulic drive according to one of claims 8 and 9, characterized in that the cylinder body (71) is hexagonal in the region of the container body (95, 99, 110), and that on the hexagonal surfaces of the cylinder body (71) which are between the container bodies ( 95, 99, 110), further hydraulic components such as changeover valve, low-pressure tank pump device and the like are fastened. Hydraulischer Antrieb nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Federanordnung (24) durch Tellerfedern gebildet ist.Hydraulic drive according to one of the preceding claims, characterized in that the spring arrangement (24) is formed by disc springs.
EP97115485A 1996-09-12 1997-09-08 Hydraulic drive Expired - Lifetime EP0829892B1 (en)

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WO2014060111A1 (en) * 2012-10-18 2014-04-24 Abb Technology Ag Electrical switching device, which switches stroke-dependently, with extended switching hysteresis
CN104103448A (en) * 2013-04-04 2014-10-15 Abb技术有限公司 Locking apparatus for a hydromechanical spring energy store drive for a gas-insulated switchgear assembly
DE102013005621A1 (en) 2013-04-04 2014-10-09 Abb Technology Ag Locking device for a hydromechanical spring-loaded drive of a gas-insulated switchgear
US9791044B2 (en) 2013-04-04 2017-10-17 Abb Schweiz Ag Locking apparatus for a hydromechanical spring energy store drive for a gas-insulated switchgear assembly
CN104103448B (en) * 2013-04-04 2018-06-01 Abb瑞士股份有限公司 The locking device of the hydrodynamics spring energy memory driver of switchgear assemblies
US11286959B2 (en) 2015-12-23 2022-03-29 Hitachi Energy Switzerland Ag Accumulator module for hydromechanical spring-loaded drive
CN112145500A (en) * 2020-09-25 2020-12-29 宁波赛福汽车制动有限公司 Closed-loop control hydraulic system and control method

Also Published As

Publication number Publication date
DE19637052A1 (en) 1998-03-19
EP0829892B1 (en) 1999-01-13
JPH10184610A (en) 1998-07-14
JP4008544B2 (en) 2007-11-14
TW385461B (en) 2000-03-21
KR100479651B1 (en) 2005-07-18
KR19980024180A (en) 1998-07-06
DE59700075D1 (en) 1999-02-25

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