CN103311040A - Hydromechanical storage module for a stored-energy spring mechanism of a high-voltage switch - Google Patents

Abstract

The invention relates to a hydrodynamic energy storage module for a spring energy storage drive of a high-voltage power switch, comprising two support plates (3, 4), between which a transmission module (1) and a helical spring assembly are arranged (6), the elastic force of the helical spring assembly (6) acts on the energy storage piston (12) for operating the switch guided in the hydraulic cylinder (10) that works together with the helical spring assembly (6) and the transmission module (1) ), wherein the helical spring assembly (6) consists of a plurality of helical compression springs (6), the helical compression springs (6) are held between the bracket plates (3,4) at their ends, and the helical compression springs (6) Arranged around the transmission module (1), and the transmission module (1) is implemented in such a way that the elastic force of the helical pressure spring (6) increases linearly with the spring stroke so that the force acting on the energy storage piston (12) remains nearly constant throughout the lift.

Description

Hydrodynamic energy storage modules for spring energy storage drives for high-voltage switches

technical field

The invention relates to a hydraulic spring energy storage drive (Federspeicherantrieb) for actuating a switch, in particular a power switch (Leistungsschalter) of a high-voltage or medium-voltage switchgear, with the features stated in claim 1 energy storage module (Speichermodul).

Background technique

Hydraulic spring energy drives for actuating high-voltage power switches eg from document DE 3408909 A1 and ABB publication Hydromechanical The Spring Drive Type HMB-2 is known from ABB Calor Emag Hochspannung GmbH, Hanau-Großauheim and also includes an energy storage module with elastic elements acting as energy storage for actuating high-voltage switches. The elastic element cooperates with a movable energy storage piston guided in the hydraulic block. For this purpose, the energy storage module is designed to provide pressure energy to the hydraulic drive of the high-voltage power switch without an additional supply of external energy and also to actuate the drive and the power switch accordingly in the event of a disturbance or interruption of the energy supply.

In energy storage modules designed as hydrodynamic spring accumulators, the supplied pressure depends on the characteristic curve of the spring or spring pack used. For the use of spring energy storage drives in power switch drives, a constant pressure over the entire energy storage piston lift of the energy storage piston is of greater significance in order to ensure a constant switching time of the power switch. This is at least approximately easily achievable only by using disc springs.

For hydrodynamic spring storage drives it is desirable that the force acting on the storage piston of the storage cylinder be as constant as possible or vary only with a very small spring constant, a relatively high pretension being required for this.

With conventional helical springs or disk springs, this can only be achieved by selecting a very small area of the spring characteristic curve, so that a large part of the stored energy is not available in the event of a tripping.

The disc springs used in known hydrodynamic energy storage modules for use in power switch drives can easily move across the entire length of the energy storage piston due to their degressive spring characteristic curve with sufficient pretension. Provides nearly constant pressure on piston lift. In order to achieve the required flat part of the spring characteristic curve, the spring must be preloaded as far as possible. Thus, on the one hand, only a small part of the energy stored in the spring is dissipated. On the other hand, disk springs are considerably more expensive than helical compression springs in the dimensions necessary for use as energy storage modules for power switch drives. Since the springs in currently used energy storage modules constitute the majority of the costs, a significant cost reduction of the energy storage modules is not possible while retaining the functional principle explained above.

Contents of the invention

It is therefore the object of the present invention to provide an energy storage module for a hydrodynamic spring energy storage drive, which is intended for use in a power switch drive, which avoids the above-mentioned disadvantages and in particular by Optimum utilization of the storable energy present in the energy storage module reduces the costs of the spring energy storage drive.

This object is achieved by an energy storage module for a hydrodynamic spring energy storage drive provided for actuating a switch according to claim 1 and by a power switch according to the parallel claim 9 .

Advantageous refinements are specified in the dependent claims.

The energy storage module according to the invention for a hydrodynamic spring energy storage drive for actuating switches, in particular power switches, comprises two carrier plates (Trägerplatte), between which a transmission module and a helical spring assembly are arranged, the spring force of which is Acts on the energy storage piston guided in the hydraulic cylinder for actuating the switch, which cooperates with the coil spring assembly and the transmission module. The helical spring assembly consists of at least a plurality of helical compression springs or helical tension springs, which are held at their ends between the carrier plates. According to the invention, the spring is arranged around the transmission module and thus delimits the interior space in which the transmission module is located.

The transmission module is designed in such a way that it can convert (uebersetzen) the spring force of the helical compression spring, which increases linearly with the spring travel, so that the pressure provided by the energy storage module and thus the force acting on the energy storage piston is over the entire stroke of the energy storage piston is kept almost constant.

According to the invention, the transmission module is designed as a lever transmission and is arranged between the bearing surfaces of the springs as explained above.

The lever drive consists of a lever and a lever receptacle, wherein the lever receptacle connects the levers to each other and to surrounding components. The lever drive preferably has four lever receptacles. Two lever receptacles are connected indirectly to the spring, the third lever receptacle is connected to the energy storage piston and the fourth lever receptacle is connected to an anchor plate, which in turn is connected to the hydraulic cylinder or energy storage cylinder. In a preferred embodiment of the energy storage module according to the invention, due to the high forces that occur, a parallel configuration of two identical transmissions with four levers is selected. A sliding bearing is used between the shaft of the lever receptacle and the lever and is fixed in the axial direction with a snap ring.

In a preferred embodiment of the energy storage module according to the invention, preferably six helical compression springs are arranged between the carrier plates, which are respectively accommodated at their ends by the carrier plates.

In a preferred embodiment, the carrier plate is provided with at least one opening, which serves as an opening for a rearwardly located adapter plate for a swivel movement. The adapter plate is connected on the one hand to the lever receptacle of the transmission module and on the other hand to the carrier plate via tie rods, thereby enabling the use of compression springs.

According to a further aspect of the invention, the energy storage module according to the invention for a spring energy storage drive is provided for actuating switches, in particular high-voltage or medium-voltage power switches.

With the energy storage module according to the invention, the non-constant spring force provided by the helical compression spring is advantageously linearized during optimization of the positional relationship by using the helical compression spring by means of the lever drive used and thus in the energy storage piston The hydraulic energy is supplied at almost constant pressure over the entire piston lift of the , in order to exert as constant a force as possible on the storage piston of the spring storage drive.

The lever drive used in the energy storage module allows the use of helical compression springs which are significantly more advantageous than disk springs with the same operating characteristics. Furthermore, the transmission can be adjusted in such a way that the spring needs only a small pretension in order to be clamped between the carrier plates. As a result, almost all of the energy stored in the spring can be used during operation of the energy storage module.

Description of drawings

A preferred embodiment of the invention will be explained in detail below with reference to the drawings. in:

FIG. 1 shows an exemplary illustration of an energy storage module according to the invention of a hydraulic spring energy storage drive,

Figure 2 shows a detailed illustration of the transmission module in a partially assembled energy storage module according to the invention,

Figure 3 shows an exemplary schematic diagram of the various components of the energy storage module shown in Figure 1, and

FIG. 4 shows graphs illustrating the transfer function of an energy storage module with helical springs or disk springs.

list of reference signs

1 drive module

2 Adapter board

3, 4 bracket plate

5 Tie rod for adapter plate

6 Helical spring assembly, helical compression spring

7 anchor plate

8 Tie rod for anchor plate

9 Connection to hydraulic cylinder

10 hydraulic cylinders

11 Bearing surface of the helical compression spring

12 storage piston

13 opening, notch

14 leverage

15 Lever housing.

Detailed ways

1 shows an exemplary schematic diagram of an energy storage module according to the invention for a hydraulic spring energy storage drive for actuating a high-voltage power switch, with two carrier plates 3, 4 between which a The transmission module 1 and the helical spring assembly 6, the elastic force of which is transmitted via the transmission module 1 (which transfers the energy stored in the helical spring assembly 6 to the axially movable storage for operating the switch guided in the hydraulic cylinder 10 can switch on the piston 12).

The helical compression spring assembly 6 surrounds two opposing spring groups, each of which consists of three cylindrical helical compression springs 6 arranged in a row, wherein the helical compression springs 6 are held at their ends on the two carrier plates 3 , Between 4.

The coil spring assembly 6 and the piston 12 are indirectly connected through the transmission module 1 so as to convert the spring lift of the coil spring assembly 6 into the piston lift of the piston 12 . This connection is realized by the tie rods 5 of the adapter plate 2, the four adapter plates and the bracket plates 3,4.

The transmission module 1 is supported on an anchor plate 7 which is connected to the hydraulic cylinder via two tie rods 8 and connections 9 .

The transmission module 1 is designed as a lever transmission and is arranged within two spring packs between the bearing surfaces 11 of the spring 6 on the carrier plates 3 , 4 .

The lever transmission 1 shown in detail in FIG. 2 is composed of an eccentrically mounted lever 14 and a lever receptacle 15 , wherein the lever receptacle 15 connects the levers 14 to each other and to surrounding components. The lever transmission 1 has four lever receptacles 15 . Two of the four lever receptacles 15 are connected indirectly to the springs 6 (in FIG. The lever receptacle is connected to an anchor plate 7 , which in turn is connected to a hydraulic cylinder or accumulator cylinder 10 . Due to the high forces that occur, the transmission module is formed from two identical transmission elements arranged parallel to each other with four levers 14 . A slide bearing is used between the shaft of the lever receptacle 15 and the lever 14 and is fixed axially with a snap ring.

The lever drive 1 is designed such that it can switch the spring force of the helical compression spring 6 , which increases linearly with the spring travel, in such a way that the pressure provided by the energy storage module is almost constant over the entire stroke of the energy storage piston 12 . A linearization of the spring characteristic curve of the helical spring 6 is thus achieved.

Thus, the transmission module 1 , the adapter plate 2 with the tie rod 5 and the anchor plate 7 with the further tie rod 8 are advantageously assembled on both sides with the helical compression springs 6 arranged on the right and left at the transmission module 1 respectively. Between the two bracket plates 3, 4, it is necessary for the structural group energy storage module of the spring energy storage drive to have a minimum position requirement.

In a preferred embodiment, the carrier plates 3 , 4 are each provided with at least one opening or recess 13 , into which opening the rear adapter plate 2 , its tie rod 5 and the transmission module 1 are pushed when the helical compression spring 6 is compressed. or notch 13.

FIG. 3 shows the energy storage module shown in FIG. 1 with the hydraulic cylinder 10 (in which the energy storage piston 12 is movably guided), the transmission module 1 , with its recess for the helical pressure spring 6 13 and the two support plates 3, 4 of the bearing surface 11 (which are configured as two independent spring groups consisting of three helical compression springs 6 respectively), the two rotating shafts with the four tie rods 5 arranged thereon An exemplary schematic view of the individual components before assembly of the web 2 and the anchor plate 7 with two further tie rods 8 fastened thereto, which are provided to be guided through the ports 9 present on the hydraulic cylinder 10 .

4 shows a schematic illustration of the applied piston force of the energy storage piston 12 of the energy storage module with disk spring (K1) versus the energy storage module 12 according to the invention with helical pressure spring assembly 6 (K2) , wherein only a relatively small pretension is necessary in the helical spring assembly according to the invention.

Claims (9)

1. An energy storage module for a hydrodynamic spring energy storage driver for operating a switch, comprising: - two bracket plates (3, 4), between which the transmission module (1) and the helical spring assembly (6) are arranged, the elastic force of the helical spring assembly (6) acts on the helical spring assembly (6) ) and the accumulator piston (12) guided in the hydraulic cylinder (10) for operating the switch, co-acting with the transmission module (1), wherein - the helical spring assembly (6) consists of a plurality of helical compression springs or helical tension springs (6) held at their ends on the support plate (3, 4) Between, - said helical compression spring or helical tension spring (6) is arranged around the transmission module (1), and -The transmission module (1) is implemented in such a way that the elastic force of the helical pressure spring (6) increases linearly with the spring stroke so that the force acting on the energy storage piston (12) is remains nearly constant throughout the lift. 2. The energy storage module according to claim 1, characterized in that, the transmission module (1) is a lever transmission device, which can convert the helical compression spring or helical tension spring (6) linearly with the spring travel. The increased elastic force enables the pressure provided by the energy storage module to be kept almost constant over the entire lift of the energy storage piston (12). 3. The energy storage module according to any one of the preceding claims, characterized in that, on the support plate (3, 4) At least six helical compression springs or helical tension springs (6) are arranged between them. 4. The energy storage module according to any one of the preceding claims, characterized in that the support plate (3, 4) A bearing surface (11) is provided for receiving the end of the helical compression spring or helical tension spring (6). 5. The energy storage module according to any one of the preceding claims, characterized in that, the transmission module (1) is connected to The support plates (3, 4) are connected together. 6. The energy storage module according to any one of the above claims, characterized in that, the transmission module (1) is supported on the anchor plate (7), and the anchor plate (7) is connected to the The hydraulic cylinders are connected. 7. The energy storage module according to any one of the preceding claims, characterized in that the transmission module (1) including its force guidance is arranged in the interior of the helical spring set (6), and the The transmission module (1) passes through the support plates (3, 4) during the switching process. 8. The energy storage module as claimed in claim 1, characterized in that the transmission module (1) has an eccentrically mounted lever. 9. A high-voltage power switch with a hydrodynamic spring energy storage driver, which is provided with the energy storage module according to any one of claims 1 to 9.

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