KR20110137334A - Hydromechanical drive for electrical circuit breakers - Google Patents

Abstract

The invention relates to at least one multiway switching valve, to an integrated damping device, to a reservoir of hydraulic compressed fluid, and preferably to at least one leaf spring which interacts with one or more storage modules. (plate spring) A fluid mechanical drive for an electric circuit breaker having an energy storage formed by a device, the fluid mechanical drive is provided with at least two multi-directional switching valve in the form of a 2 / 2-port directional control valve, Hydraulic drive of the drive is matched with the at least two multi-directional switching valves.

Description

HYDROMECHANICAL DRIVE FOR ELECTRICAL CIRCUIT BREAKERS}

The invention relates to a hydraulically actuated cylinder / piston device acting on an electrical circuit breaker, at least one multiway switching valve, an integrated damping device, a reservoir of hydraulic compressed fluid, and preferably A fluid mechanical drive for an electrical circuit breaker having an energy reservoir formed of at least one plate spring arrangement interacting with one or more storage modules.

Conventional fluid mechanical spring storage drives generally interact with 2 / 3-port directional seat valves and are modularized into components such as charging modules, actuation modules, storage modules, monitoring modules and control modules. Is formed in a manner. As a result of the modular structure, the scope of application of the drive section is significantly widened. The actuating module has an integrated damping system for the switching-on and switching-off directions, and is essentially operated by a spring reservoir which forces one or more storage modules.

If, during the adaptation process, a known hydromechanical spring storage drive needs to be adapted in terms of the required driving energy or rated switching sequence, this leads to even more component requirements in the existing design. .

The damping system, which is integrated in a known manner, must in each case be adapted to the relevant application. To this end, it has always been necessary to determine by testing each of the components involved in attenuation in order to set the appropriate attenuation characteristics, which means that the existing drive can not set the attenuation from the outside and therefore the time consumed and used during the manufacturing process. This will increase the amount of material.

In addition, this also means that a number of additional parts and in some cases new parts are also needed to enable this corresponding adaptation, and in other situations there is no need to provide such a part. In particular, in the case of the mentioned functional enhancement, in some situations an additional 2 / 3-port directional seat valve is required, and the supply of such a seat valve can be a problem, not to mention an increase in the manufacturing cost, thus producing This increases the time that must be spent during the process.

It is also a disadvantage that the attenuation to be set in each case cannot be measured from the outside, and therefore the operator cannot reliably confirm from the outside whether the predetermined requirements have been met.

From this prior art, it is an object of the present invention to provide a fluid mechanical drive of the type mentioned at the beginning of the present specification so as to achieve the widest possible range of alternative uses or applications while having the lowest possible degree of complexity. To improve.

This object is achieved according to the invention by the features of claim 1.

Thus, according to the present invention, the fluid mechanical drive is provided with at least two multidirectional switching valves designed as 2 / 2-port directional valves, and the hydraulic control of the drive is incorporated into the at least two multidirectional switching valves. Matches. As a result, the complexity that would have previously been required to control circuit breakers in other situations is substantially due to the fact that standardized components can be used for this purpose and that no customization is specifically tailored for each application. Is reduced.

Thus, a preferred embodiment of the fluid mechanical drive according to the invention increases the switching capacity by interacting with each of the 2 / 2-port directional valves as a energy reservoir with a storage module individually coupled with the 2 / 2-port directional valve. Makes it possible.

Another preferred aspect of the fluid mechanical drive according to the invention is characterized in that at least one other storage module is connected in parallel in order to increase the driving energy, which is not possible with a conventional switching unit and must be planned in advance. .

According to another embodiment of the fluid mechanical drive according to the invention, at least one other storage module is connected in parallel to extend the rated switching sequence. In conventional switching drives, this additional increase in functionality also requires suitable preliminary planning, since otherwise subsequent adaptation of the rated switching sequence cannot be done or involves very high complexity.

According to another advantageous feature of the invention, the drive according to the invention is characterized in that the operation of the valves in each case is made by a control cam of the camshaft. The camshaft is thus preferably operated electrically, for example by a stepping motor, or instead of the electric drive, the camshaft can be operated mechanically, for example via a set of gears.

The drive for operating the camshaft may have a hydraulic or fluid mechanical structure.

Another feature of the fluid mechanical drive according to the invention is characterized in that the control cam is operated in a rotational manner. Alternatively, however, the control cam may instead also be operated in a translational manner.

According to another advantage of the fluid mechanical drive according to the invention, there is provided a standard hydraulic element which is operated by a control cam, thus switching on or off the hydraulic drive.

So preferably the outer contour of the control cam is preset, i.e., according to the outer contour of the control cam, [lacuna] is activated, which switches on the hydraulic drive over time. Or off.

Also from this the outer contour of the control cam determines its control behavior and the switching characteristics of each of the fluid mechanical drives according to the invention.

Thus, the control cam is provided with a defined contour for selectively controlling the switching behavior of the 2 / 2-port directional seat valve.

Another advantageous feature of the fluid mechanical drive according to the invention is that each cam position is maintained at the end of the switching process. Thus, subsequent switching procedures are immediately possible without having to take the switching position first.

According to another preferred embodiment, each storage module which functions as an energy store is preferably formed of at least one spring assembly, which spring assembly is preferably composed of a leaf spring, and is preferably designed as a leaf spring stack. do.

These and other advantageous embodiments and improvements of the invention are the subject matter of the dependent claims.

The present invention, the preferred embodiments and improvements of the present invention, and the specific advantages of the present invention are described in more detail with the aid of exemplary embodiments of the invention shown in the accompanying drawings.

As noted above, the present invention is substantially reduced by the complexity previously required to control circuit breakers, as components standardized for this purpose can be used and the need for a custom process specifically tailored for each application is eliminated. Effect.

1 is a circuit diagram of a fluid mechanical drive for an electrical circuit breaker.

FIG. 1 shows a circuit diagram of a fluid mechanical drive 10 for an electrical circuit breaker 12, which illustrates how the fluid mechanical drive 10 operates and the fluid mechanical drive 10 in its respective functionally coupled state. It shows the component to which it belongs. In other situations, the individual components and units associated with one another in a compact device are shown here separated from one another to illustrate their functional interaction.

In FIG. 1 shown, components whose functions are described in detail below have different spatial positions depending on their function to illustrate a particular simplified switching structure and method of operation thereof. Accordingly, the core of the fluid mechanical drive 10 and the electrical circuit breaker 12 operated by the fluid mechanical drive are located in the center of the figure.

Shown thereon with the switching circuits the relevant components provided for switching off, ie opening the electrical circuit breakers.

Below the hydromechanical drive 10 and the electrical circuit breaker 12 in which the fluid mechanical drive acts, a switching device is shown with the associated components provided for switching on, ie closing the electrical circuit breaker.

The actuated circuit breaker 12 is shown in a simplified manner with an electrical switching symbol. The movable contact member 14 is connected to a hydraulic piston 18 designed as a differential piston, so that the hydraulic cylinder 20 for opening and closing the switching contact 14 of the circuit breaker 12. It is operated by a piston rod 16 guided therein.

This hydraulic cylinder 20, which forms the core of the fluid mechanical drive 10, has a total of four connections 20.1, 20.2, 20.3, and 20.4 that connect to a fluid line for supplying or removing fluid. The piston 18 guided in the hydraulic cylinder 20 is designed as a differential piston. Thus, the hydraulic cylinder 20 has cylinder spaces 21.1 and 21.2.

Cylinder space 21. 1 contains a fluid for activating the switching off of electrical circuit breaker 12; The cylinder space 21.2 is filled with fluid when the electrical circuit breaker 12 is switched on.

The hydraulic cylinders 20 are respectively connected to the shaft rods 27.1 of the first control cam 28 of the camshaft 30 via the first pressure line 22 and the first outlet line 24. Is fluidly connected to a first 2 / 2-port directional valve 26 (also shown only in the symbols) actuated by it.

Similarly, a second 2 / 2-port directional valve 36 (also shown only in the symbols) actuated by the shaft rod 37.1 of the second control cam 38 of the camshaft 30 also has a second outlet line. It is connected to the hydraulic cylinder 20 via 32 and the 2nd pressure line 34.

As can be seen from the circuit diagram of the fluid mechanical drive 10 shown in FIG. 1, the cams 28 and 38 have two 2 / 2-port directional valves 26 and 36 synchronized, ie simultaneously but in opposite directions. 90 ° offset from each other to operate the This means that the valve positions of the two 2 / 2-port directional valves 26 and 36 correspondingly supply or remove the control fluid open “off” to the switching position of the switching contact 14 of the electrical circuit breaker 12. To the position required for the process and thus required for the " on " closing process for the switching position of the switching contact 14 of the electrical circuit breaker 12 and thus taking the open position and thus the switching-on position. do.

In essence, the two 2 / 2-port directional valves 26 and 36 housed within a single housing are shown as separate assemblies from each other due to their different switching functions and the fluid connections required therein, each of which selector rods for synchronized operation. via selector rods (27.2 and 37.2).

As already mentioned, the two 2 / 2-port directional valves 26 and 36 are actuated by cams 28 and 38. These cams 28 and 38 open or close the fluid path in two 2 / 2-port directional valves 26 and 36.

The following description relates to how the open position of the switching contact 14 of the circuit breaker 12 shown in FIG. 1 is achieved. To this end, the control drive of the camshaft is controlled such that the first cam 28 takes the shown position to act on the selector rod 27.1 on its flat side.

In the 2 / 2-port directional valve 26, the fluid channel in the valve 26.1 flows from the energy reservoir 40 through the pressure line 42 to the valve 26.1 and is uninterrupted therefrom. Through 22 it flows to the connection 20.1 of the hydraulic cylinder 20, whereby the piston 18 is opened to take the final position shown in the cylinder base of the hydraulic cylinder 20.

At the same time, the fluid path in the valve 26.2 of the 2 / 2-port directional valve 26 is controlled by the line 24, valve by the piston 18, where the fluid previously located in the cylinder space 21.2 moves towards the cylinder base. (26.2) and line (44) to open to the low pressure tank of fluid.

The outlet line 24 incorporates a controllable choke vale 48 that allows the fluid to be removed in a controllable manner from the cylinder 20 to the low pressure reservoir 46.

The outlet line 32, through which the fluid in the cylinder 20 can flow during the switching-on process, ie when the cylinder space 21.2 is filled with fluid, is opposite the connection 20.1 to the pressure line 22. It is connected to the connection part 20.3. A controllable choke valve 49 that allows fluid to flow in a controlled manner is also incorporated into the outlet line 32 such that the closing of the electrical circuit breaker 12 is achieved with the required accuracy.

The outlet line 32 with controllable choke valve 49 leads to the valve block 36.2 of the 2 / 2-port directional valve 36, and the 2 / 2-port directional valve 36 is line 50 ) Is connected to the low pressure tank 52.

The low pressure tank 52 is again connected to the pump 58 driven by the motor 57 via the line 54 in which the low pressure filter 56 is arranged.

The outlet line 34 connected to the valve block 36.1 of the 2 / 2-port directional valve 36 is connected to a connection 20.4 opposite the connection 20.2 to the pressure line 24. By opening the valve in the valve block 36.1, compressed fluid from the energy store 60 can flow through the line 62 to the valve 36 and consequently the cylinder space 21.2.

As already explained above, the 2 / 2-port directional valve 36 is operated by the cam 38, thereby controlling it in a manner corresponding to the 2 / 2-port directional valve 26.

Compression fluid is supplied to the energy reservoirs 40 and 60 by means of the pumps already mentioned, which are connected to the energy reservoirs 40 and 60 via lines 64 and 68 and connected to the energy reservoirs 40 and 60. Supply compressed fluid. In order to prevent unwanted pressure buildup, for example, when the pressure pump is switched off, a check valve (line 64 and 68) is provided for each of the check valves to keep the compressed fluid present in the energy reservoirs 40 and 60 at the required pressure level. A non-return valve 66 is provided.

A line connecting the low pressure tank 46 to the low pressure tank 52 is not shown in this circuit diagram, from the low pressure tank 52 to the common line 54 leading to the pressure pump 58 and the low pressure filter 56. Is interposed between them.

10: fluid mechanical drive 12: electric circuit breaker
14: contact member 16: piston rod
18: piston 20: hydraulic cylinder
20.1, 20.2, 20.3, 20.4: Connections 21.1, 21.2: Cylinder space
22: pressure line 24: outlet line
26: 2 / 2-port directional valves 26.1, 26.2: valve block
28: control cam 30: camshaft
32: outlet line 34: pressure line
36: 2 / 2-port directional valves 36.1, 36.2: valve block
38: control cam 40: energy storage
42: compressed fluid line 44: fluid line
46: low pressure tank 48, 49: controllable choke valve
50: fluid line 52: low pressure tank
54: line 56: low pressure filter
57: drive motor 58: pressure pump
60: energy store 62: pressure fluid line
64: pressure line 66: non-return valve
68: pressure line

Claims (19)

As a fluid mechanical drive for an electrical circuit breaker,
At least one plate spring interacting with at least one multiway switching valve, an integrated damping device, a reservoir of hydraulic compressed fluid, and preferably one or more storage modules. A fluid mechanical drive for an electrical circuit breaker, having an energy reservoir formed of a device,
The fluid mechanical drive comprises at least two multidirectional switching valves designed as 2 / 2-port directional valves, wherein the hydraulic control of the drive is matched with the at least two multidirectional switching valves. Fluid mechanical drive. The fluid mechanical drive of claim 1, wherein each of the 2 / 2-port directional valves interacts with a storage module individually coupled with the 2 / 2-port directional valve as an energy reservoir. . The fluid mechanical drive of claim 1 or 2, characterized in that at least one other storage module is connected in parallel to increase drive energy. 3. The fluid mechanical drive of claim 1, wherein at least one other storage module is connected in parallel to expand the rated switching sequence. 4. 5. The fluid mechanical drive of claim 1, wherein the actuation of the valves is performed by a control cam of a camshaft, respectively. 6. 6. The fluid mechanical drive of claim 5, wherein the camshaft is electrically operated. 6. The fluid mechanical drive of claim 5, wherein the camshaft is mechanically operated. 6. The fluid mechanical drive of claim 5, wherein the camshaft is hydraulically actuated. 6. The fluid mechanical drive of claim 5, wherein the camshaft is actuated mechanically. 10. Fluid for an electrical circuit breaker according to any one of the preceding claims, characterized in that a standard hydraulic element operated by the control cam is provided, thereby switching on or off of the hydraulic drive. Mechanical drive. The fluid mechanical drive of any of claims 1 to 10, characterized in that the outer contour of the control cam is predetermined. 12. The fluid mechanical drive of claim 11, wherein the outer contour of the control cam determines the control behavior of the control cam. 13. Fluid according to claim 11 or 12, characterized in that the control cam has a defined contour for selectively controlling the switching behavior of the 2 / 2-port directional valve. Mechanical drive. 14. A fluid mechanical drive according to any one of the preceding claims, wherein the control cam is operated in a rotary motion manner. 13. The fluid mechanical drive of any of claims 1 to 12, wherein the control cam is operated in a translational manner. 16. A fluid mechanical drive according to any one of the preceding claims, wherein each cam position is maintained at the end of the switching process. 17. The fluid mechanical drive of claim 1, wherein said energy reservoir interacts with at least one storage module and is formed of at least one spring assembly. 17. The fluid mechanical drive of claim 16, wherein the spring assembly is formed of a leaf spring. 18. The fluid mechanical drive of claim 16 or 17, wherein the spring assembly is designed in a leaf spring stack.

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