DE102011011311A1 - Drive for a high voltage circuit breaker - Google Patents

Abstract

The invention relates to a hydraulic drive (10), in particular for a high-voltage circuit breaker, with a working cylinder in which a working piston can be moved, with an energy store (12) containing a plate spring arrangement (16) which is guided along a central axis (30) and pressurizes hydraulic fluid, which is located in a drive block (14) and forms a drive block (14) and is supplied by a pump from a reservoir, with one axial end of the disc spring assembly (16) being supported on a spring plate (24) and the other end cooperating with the working piston, wherein the central axis (30) of the plate spring arrangement (16) is arranged transversely to the central axis (32) of the working cylinder and the working piston and so that the overall height of the hydraulic drive (10) is reduced.

Description

The invention relates to a drive for a high-voltage circuit breaker, in particular a hydraulic drive, which comprises a housing having a working cylinder in which a working piston is movable, and an energy storage device which contains a plate spring assembly formed from at least one plate spring pair, which guided along a central axis is and in a drive block forming a container arrangement befindliches, supplied by a pump from a reservoir hydraulic fluid under pressure, wherein one axial end of the plate spring assembly is supported on a spring plate and the other end cooperates with the working piston.

It is well known that high-voltage circuit breakers are equipped with special drives, which are also ready for operation when the supply of drive energy has failed or is interrupted.

From the DE 36 11 501 A1 is a corresponding drive for switching operation of a high-voltage circuit breaker known by means of a linear movement, which is generated by a hydraulically actuated piston-cylinder assembly.

This known drive is provided with a housing arranged in a spring means which is provided as energy storage. The disk springs used as energy storage are based on the housing bottom and load a movable pressure cylinder. This is directly connected to the pre-built in the axial direction, arranged in a valve housing drive cylinder. The piston rod of the drive cylinder penetrates both the impression cylinder and the housing bottom.

Furthermore, from the DE 19637052A1 a particular designed for a high-voltage circuit breaker hydraulic drive has become known, which has a working cylinder in which a working piston is movable, which in turn cooperates with a storage spring arrangement containing energy storage. In this case, located in a container assembly fluid is pressurized, wherein the memory spring assembly is supported at one end on the cylinder housing and acts with its other end on a movable, the working cylinder housing also surrounding pressure piece. In this case, the spring-loaded arrangement and the working cylinder housing are arranged one behind the other, wherein the likewise surrounding the working cylinder housing container assembly comprises at least two axially extending bores in each of which a pressure piston is slidably displaceable and at one end face of the pressure piece abuts, while at the other end face the pressure fluid is present.

Although this drive basically fulfills the drive requirements, its size is designed for high drive power and unfavorable for a space-saving application with medium drive energies. In addition, its manufacture requires the use of several custom-made modules, which increases the cost of obtaining these parts.

Based on this prior art, it is therefore an object of the invention to provide a drive for a high-voltage circuit breaker of the type mentioned, which enables a compact and simple design in the simplest possible way reliable.

Preferably, as far as possible standardized components and semi-finished products are to be used in order to improve the procurement possibilities for the starting material. The number of necessary for the output hydraulic blocks should be reduced to only one hydraulic block.

This object is solved by the features of claim 1. Accordingly, it is provided that the central axis of the disc spring assembly is arranged transversely to the central axis of the working cylinder and the working piston and that the height of the hydraulic drive is reduced.

This design according to the invention makes it possible for the first time both to provide a space-saving drive solution, but on the other hand also by using standard parts or by the use of standardized material in the form of plate material, extruded or semi-finished semi-finished also easily and easily produced.

According to an advantageous embodiment of the invention, the hydraulic drive according to the invention is characterized in that the disc spring assembly acts on the working piston by means of a transmission member. For this purpose, according to an advantageous embodiment, a hydraulic functional element may be provided as a transmission member.

According to a preferred alternative embodiment, however, the transmission member may also be a mechanical functional element, for example a lever mechanism, which causes a quasi delay-free application of the working piston by appropriate parameterization of the lever paths.

According to an advantageous embodiment, an additional piston-cylinder arrangement can be arranged in the housing for the drive for a high-voltage circuit breaker in addition to the cylinder bore for the working piston, which cooperates with the formed from at least one disc spring pair energy storage.

According to a preferred embodiment of the inventive drives, the length of the arrangement formed from the working cylinder and the working piston is selected so that it corresponds to the diameter of the plate spring assembly almost, that is, the size of the plate springs of the disc spring assembly according to the invention, which determine the amount of storage energy, and the dimensions of the working cylinder are coordinated so that when the required energy density of the energy storage diameter of the disc springs and length of the working cylinder are approximately equal. This allows a very compact design of the drive according to the invention.

An advantageous design of the drive according to the invention provides that form at least 3 spring pairs, the disc spring assembly, wherein in the rest position each pair of springs with its outer circumference each contacted each other, that is, two disc springs forming a pair are facing each other with their concave surfaces and form so together an elliptical cross-section. As a result, an optimized both in terms of the required actuation energy and in terms of the required volume of space execution of the spring assembly is possible.

In a preferred embodiment of the drive according to the invention, the plate spring assembly is formed by a pressure plate and a spring cover between which the at least three spring pairs of at least three are either evenly distributed or point-symmetrically parallel to each other arranged tension rods anchored.

According to a further advantageous embodiment, the working cylinder is arranged with the working piston guided therein in a block-like housing, in which also hydraulic components such as valves and a pump for the hydraulic fluid are integrated or attached thereto.

These constructive measures, like the previously indicated design variants, serve to ensure the compactness of the hydraulic drive according to the invention.

Other advantages include the targeted avoidance of interfaces, which ensure increased external tightness, as well as simplified manufacturing and system testing.

These and other advantageous features and advantages and improvements are the subject of further claims.

Reference to an embodiment schematically shown in the accompanying drawings, the invention, particular advantageous refinements and improvements of the invention and particular advantages of the invention will be explained and described in detail.

It shows:

1 a schematic side view of a drive assembly according to the invention

1 shows a schematic side view of a drive arrangement according to the invention 10 , which is an energy store 12 and a drive block called a mono block 14 includes.

The energy storage 12 consists of a plate spring arrangement 16 , which in the example shown from 3 pairs of each facing each other arranged disc springs 18 is formed, which between a spring cover 24 and a pressure plate 22 by means not shown in this illustration, around a central axis 30 around arranged tension rods or tie rods is clamped.

The of the plate spring arrangement 16 formed energy storage 12 is optional of a hood-like housing 26 surrounded, which protects the energy storage against external influences.

In the drive block 14 , which is shown here as a "black box", is on the one hand not shown here in detail, but only with its central axis 32 symbolically indicated working cylinder arranged with a movable piston therein; on the other hand are in the drive block 14 or arranged directly thereon hydraulic components such as valves and a pump for the hydraulic fluid.

Essential for the present invention is the feature that on the one hand the central axis 30 of the plate spring assembly 16 formed energy storage 12 and on the other hand, the central axis 32 the working cylinder, that is the drive block 28 are arranged transversely to each other. Here also comes through the proposed stratification of the springs in the disc spring assembly optimal arrangement of the plate spring comes into play.

This can to a considerable extent otherwise required space for the drive block 14 and energy storage 12 formed drive 10 can be saved, so that a compact design is possible as a monoblock.

The monobloc itself is built in an integral way and contains all the hydraulic modules necessary to make circuits. The previously conventional modular design is integrated according to the invention in monoblock in a single system.

In continuation of the central axis 32 of the drive block 28 is on the case 26 in schematic representation, a cooperating with the working piston output 33 arranged for the high-voltage switch, not shown here, which causes the operation of the high-voltage switch.

LIST OF REFERENCE NUMBERS

10

drive

12

energy storage

14

Drive block, monoblock

16

Disc spring arrangement

18

spring pair

20

Belleville spring

22

ejection plate

24

spring cover

26

Housing for energy storage

28

drive block

30

Center axis of the energy storage

32

Center axis of the drive block

33

Output to HS switch

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3611501 A1 [0003]
• DE 19637052 A1 [0005]

Claims (9)

Drive ( 10 ), in particular for a high-voltage circuit breaker, which drive comprises a housing which has a working cylinder in which a working piston can be moved, and an energy store ( 12 ), which is formed from at least one plate spring pair energy storage plate spring assembly ( 16 ), which along a central axis ( 30 ) and in a drive block ( 14 ), which is supplied by a pump from a reservoir pressurized hydraulic fluid under pressure, wherein one axial end of the plate spring assembly ( 16 ) on a spring plate ( 24 ) and the other end cooperates with the working piston, characterized in that the central axis ( 30 ) of the plate spring arrangement ( 16 ) transverse to the central axis ( 32 ) of the working cylinder and the working piston is arranged and that so the height of the drive ( 10 ) is reduced. Drive according to claim 1, characterized in that the disc spring arrangement ( 16 ) is acted upon by the working piston by means of a transmission member. Drive according to claim 2, characterized in that the transmission member is a hydraulic functional element. Drive according to claim 1 or 2, characterized in that the transmission member is a mechanical functional element, for example a lever mechanism. Drive according to one of the preceding claims, characterized in that the diameter of the plate spring arrangement ( 16 ) Almost corresponds to the length of the arrangement formed from the working cylinder and the working piston. Drive according to one of the preceding claims, characterized in that at least 3 spring pairs ( 18 ) the plate spring arrangement ( 16 ), wherein in the rest position in each case the springs of a spring pair ( 18 ) lie with their outer circumference together. Drive according to claim 6, characterized in that the disc spring arrangement ( 16 ) from a pressure plate ( 22 ) and a spring cover ( 24 ) is formed, between which the at least 3 spring pairs ( 18 ) are anchored by at least 4 point symmetry parallel to each other arranged tension rods. Drive according to one of the preceding claims, characterized in that the working cylinder with the working piston guided therein in a block formed as a block-like drive block ( 14 ), in which also hydraulic components such as valves are integrated. Drive according to one of the preceding claims, characterized in that in the housing in addition to the cylinder bore for the working piston, an additional piston-cylinder arrangement is arranged, which cooperates with an energy storage device formed from at least one disc spring pair.

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