JPS643146Y2 - - Google Patents

Description

[Detailed description of the invention] A. Industrial field of application The present invention relates to a spring energy storage device for a switch, and in particular is used to open the contacts of a switch such as a power switch, a load switch, or a contactor. The present invention relates to a spring energy storage device for a switch that stores energy in an operation spring for operating or closing the switch.

B. Prior Art Conventionally, in a switch such as a power cutter or disconnector, a device for accumulating a compression coil spring or a tension coil spring as an operating spring for opening or closing a contact has been equipped with an appropriate fixed part. One end of the operating spring is pivotally connected to the spring shaft, and the other end of the spring is pivotally connected to a lever provided at one end of the spring shaft. A rotation regulating cam is provided at the other end of the spring shaft in order to maintain the operating spring which is interlocked with the shaft and stores energy by approximately half a rotation of the spring shaft, and a hook that engages with the rotation regulating cam. The spring shaft is provided with an operating cam (having an involute curved cam surface) for extending the link mechanism and closing the contacts of the switch by releasing the restriction on rotation of the shaft.

C. Problems to be solved by the invention However, in the above spring energy storage device, the rotary drive device and the spring shaft are connected via a reduction gear, so a stop command is issued when the operating cam slightly exceeds the dead point. Even though the rotation of the spring shaft is restricted by the hook, the rotational force is still transmitted to the spring shaft even after the rotation of the spring shaft is restricted by the hook.

Therefore, the hook is loaded not only with the release force of the operating spring but also with the rotational force due to the inertia of the rotary drive device, so the hook must have high mechanical strength and the electromagnet that pulls the hook must also be strong. There are problems such as needing things.

Therefore, in view of the above problem, the present invention is designed so that only the releasing force of the operating spring can be loaded on the hook for holding the operating spring in the stored state, and the rotational force due to the inertia of the rotary drive device is not loaded. An object of the present invention is to provide a spring energy storage device for a switch.

D. Structure of the invention The structure of the invention to achieve this purpose is as follows:
A spring shaft is interlocked and connected to the rotary drive device via a one-way clutch, and one end of an operating spring that stores energy by approximately half a rotation of the spring shaft and releases energy by the remaining half rotation is connected to this spring shaft, and also connects the operating spring to the spring shaft. The other end is fixed to a fixed part, and a hook is provided to hold this operation spring in a stored state and restrict the remaining half rotation of the spring shaft, and by releasing the restriction on the spring shaft, the link mechanism is extended and the contact of the switch is opened. In a spring energy storage device for a switch in which an operating cam for closing a switch is provided on a spring shaft, a sprocket, etc. is provided on the output shaft of the rotary drive device via a one-way clutch, and the sprocket, etc. provided on the spring shaft is connected between the sprocket, etc. The rotary drive device and the spring shaft are interlocked and connected by wrapping a chain or the like having sufficient slack around the spring shaft.

E. Embodiments Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway front view of a power vacuum shield breaker equipped with a spring energy storage device according to the present invention. It is generally composed of pole columns 2 for three phases provided therein, and an operating device 3 mounted on a pedestal 1 to open and close the contacts in each pole column 2.

The pedestal 1 is supported horizontally by a plurality of legs 4, and three pole columns 2 are erected on the case 5 at appropriate distances from each other in the longitudinal direction thereof.

Each pole pole 2 is used to turn on and cut off (open and close) the main circuit, and each pole pole 2 has a support insulator tube 6 and a sheath cut insulator tube 7.
and a vacuum interrupter 8 inside it.
It is made up of storing. Inside the vacuum interrupter 8, there is a fixed contact 8a and a movable contact 8b that can freely come into contact with and separate from the fixed contact 8a.
An insulating rod 9 connected to the movable contact 8b is inserted into the support insulator tube 6 so as to be able to move vertically.

The lower end of each insulating rod 9 is connected to one end of a lever 11, such as a bell crank, via a pressure spring 10, such as a compression coil spring. The bent portion of each lever 11 is swingably supported via a shaft horizontally suspended in the case 5, and the other end is pivotally connected to a connecting rod 12 that is movable in the longitudinal direction within the case 5. The connecting rod 12, together with the lever 11, constitutes a connecting mechanism 13 that interlocks and connects each pole column 2 with an operating device 3, which will be described later.One end (the right end in FIG. 1) of the connecting rod 12 is equipped with a compression coil spring. The blade spring 15 is installed, and the blade spring 15 is installed.
is covered by case 14.

The operating device 3 opens and closes the contacts 8a and 8b of each pole column 2 via a connecting mechanism 13, and is housed in an operating case 16 attached to the lower part of the case 5. As shown in FIG. 2, the operating device 3 includes a closing spring energy storage device 17 that can freely store energy in the closing spring.
Then, the contacts 8a and 8b of each pole column 2 are closed and maintained in the closed state while the closing spring 15 is loaded with energy by releasing the closing spring, and the closing spring 15 is released by the release command. It consists of an opening/closing link mechanism 18 that opens the contacts 8a and 8b, and a speed adjustment device 19 that adjusts the speed of closing and cutting operations.

That is, a rotary drive device 20 such as an electric motor is fixed to the operation case 16 through a speed reduction device 21 whose shaft extends in a horizontal direction perpendicular to the longitudinal direction of the case 5 and which is interlocked and connected to the shaft. A small sprocket 22 is connected to the output shaft 21a of the reduction gear 21 via a one-way clutch 23.
is provided. This one-way clutch 23
This is a configuration in which the sprocket 22 can freely rotate only in one direction (counterclockwise direction in FIG. 2) with respect to the output shaft 21a.

Further, a spring shaft 24 parallel to the output shaft 21a is rotatably supported in the operation case 16 via a bearing (not shown). A large sprocket 25 is fixed to one end of the spring shaft 24 (the right end in FIG. 2). A chain 26 having sufficient slack is wound around the large sprocket 25 and the small sprocket 22, and this chain 26 is tensioned by a tensioner 27.

The tensioner 27 prevents slackness in the taut side (upper side in FIG. 2) and slack side of the chain 26. The tensioner 27 is made of a pair of plates arranged to hold the chain 26 in between to prevent it from meandering. The tensioner 27 has sprockets 27b that can be engaged with the chain 26 from the outside at both ends of the sprocket support member 27a.
One end of the link 27c is pivotally supported on a bracket (not shown), and the other end of the link 27c is pivotally supported on the vicinity of the middle portion of the sprocket support member 27a.
2 via a spring 27d, such as a tension coil spring, so as to bring each sprocket 27b into mesh with the chain 26.

One side of a closing cam 28, which is a perfect circular operating cam whose outer peripheral surface is a cam surface, is fixed to the other end of the spring shaft 24 with an appropriate eccentricity. The closing cam 28 is for transmitting the accumulated force of a closing spring to the opening/closing linkage mechanism 18, which will be described later, and extends in a direction perpendicular to the spring shaft 24 at a position farthest from the center of rotation on one side of the closing cam 28. One end of a closing spring 29 serving as an operating spring such as a compression coil spring is pivotally connected via a bracket 30, and the other end of this closing spring 29 is pivotally supported by a bracket 31 fixed to the operating case 16. Further, a latch roller 32 is pivotally attached to the other side of the closing cam 28, and the latch roller 32 is attached to the spring shaft 24 by approximately half a rotation (the pivot point of one end of the closing spring 29 is the center of rotation of the spring shaft 24). and the pivot point of the other end of the closing spring 29 (located slightly above the dead point in FIG. 2), the hook 33 holds the closing spring 29 in the loaded state. are provided so as to be freely engageable.

The middle part of the hook 33 is located near the operation case 1.
It is rotatably supported via a pin 34 implanted in the latch roller 32, and its rotation in the clockwise direction in FIG. ing. The upper end of a connecting link 35 is pivotally attached to the other end of the hook 33, and the lower end of this connecting link 35 has a closing lever that is swingably supported via a shaft 36 installed in the operation case 16. One end of 37 is pivotally connected. A hook 33 is attached to the other end of the input lever 37 by rotating the input lever 37 clockwise about the shaft 36 in the clockwise direction in FIG.
In order to release the engagement with the latch roller 32, the movable iron core 38a of the closing electromagnet 38 is opposed to the closing electromagnet 38.

The hook 33 is rotated in the clockwise direction in FIG. 2 about the pin 34 by a return spring 39 such as a tension coil spring so as to be able to engage with the latch roller 32 again after disengaging with the latch roller 32. It is something that is biased towards.

One end of a tripping link 40 is pivotally supported on the operation case 16 via a shaft 41 parallel to the spring shaft 24 . The tripping link 40 constitutes a part of the opening/closing link mechanism 18 together with a toggle link and the like described later, and includes two sets of parallel link plates 40a and 40b connected via a connecting pin 42.
It consists of The lower ends of the pair of guide links 44, whose upper ends are rotatably supported by a shaft 43 supported by a bracket (not shown), are rotatably connected to the other end of the tripping link 40 via a shaft 45. has been done. Pair of link plates 40a, 4
0b is a connecting pin 42 located slightly lower in FIG. 2 than on the straight line connecting the shafts 41 and 45 at both ends.
The link plate 4
A state in which the pin 46 horizontally suspended between 0a and 40a contacts the locking portion 47 provided at the end of the other link plate 40b, 40b, and the connecting pin 42 descends, causing the tripping link 40 to protrude downward. It is designed to prevent bending.

The abutment portion 48 formed below the end of the link plate 40b has a contact portion 48 for bending the bent portion of the tripping link 40 upward to a projecting state to release the closed state of the toggle link, which will be described later. The movable cores 49a of the tripping electromagnets 49 are opposed to each other.

At the other end of the tripping link 40, a toggle link 5 is provided.
The lower ends of 2 are connected via a shaft 45. The toggle link 52 is constructed by connecting a pair of parallel link plates 52a and 52b in a flexible manner via a pin 51, and providing the pin 51 with a roller 50 that comes into contact with the input cam 28. One end of a main lever 53 is connected to the upper end of the toggle link 52 via a shaft 54.
The middle part of the main shaft 55 is horizontally suspended on the operation case 16.
It is attached via the shaft.

The roller 50 is pushed to the left in FIG. 2 by the remaining approximately half turn of the closing cam 28 due to the release of the closing spring 29, and the pin 51 is positioned on the straight line (dead point) connecting the shafts 45 and 54 at both ends. The upper link plate 52b moves to a position slightly to the right in FIG. is provided to engage with the upper end of the. That is, the hook 56 is pivotally supported near the middle part to the operation case 16 via a pin 57.
Its tip end is biased to the left in the figure by return springs 62 and 63.

A connecting rod 59 extending in the vertical direction is pivotally attached to the other end of the main lever 53 via a shaft 58.
The upper end of this connecting rod 59 is pivotally connected to the central lever 11 of the connecting mechanism 13. Also,
A rod 19a of the speed adjusting device 19 is connected to the lower end of the connecting rod 59. Speed adjustment device 1
Reference numeral 9 is used to adjust the operation speed during loading and unloading, and to absorb and alleviate the shock when each operation is completed.The lower part of the main body 19b is a shaft 60 extending in the horizontal direction.
It is pivoted to the bracket 61 via.

The rotation drive device 20 is configured such that its power is stopped by a limit switch or the like when one end of the closing spring 29 slightly exceeds a dead point.

The operation of turning on and cutting off the vacuum shear cutter with the above configuration will be explained using the drawings from FIG. 3 onwards.

First, as shown in Fig. 3, the vacuum interrupter 7
To charge the closing spring 29 when the fixed and movable contacts 8a and 8b are open, the rotary drive device 20 is operated to rotate the spring shaft 24 counterclockwise in FIG. 3. When the spring shaft 24 is rotated approximately half a turn, the closing spring 29 is compressed by the closing cam 28 and stored, and is held in the loaded state by the hook 33. In other words, the closing spring 2 in the closing cam 28
9 exceeds the dead point as shown in FIG. 4, the spring shaft 24 rapidly rotates counterclockwise due to the release of the closing spring 29. Its rotation is regulated. At this time, since sufficient slack is provided in the chain 26, after the closing cam 28 exceeds the dead point, until the latch roller 32 comes into contact with the hook 33, the small sprocket 22 provided on the rotary drive device 20 immediately before the stop occurs. The large sprocket 25, which is integrated with the closing cam 28, rotates rapidly due to the releasing force of the closing spring 29, and as a result, the tension side (upper) of the chain 26 loosens as shown in FIG. 20 rotational force is not transmitted to the spring shaft 24.

Then, when the hook 33 and the latch roller 32 are disengaged by actuation of the closing electromagnet 38 in response to a closing command, the closing cam 28 rotates as the closing spring 29 is released. Then, as shown in FIG. 6, the closing cam 28 extends the opening/closing link mechanism 18, the main lever 53 rotates to the left, and the connecting rod 59 descends, causing the fixed contact 8a and movable contact 8b of the vacuum interrupter 7 to closes. In this case, the opening/closing link mechanism 18 is held in the closed state by the hook 56.

On the other hand, regarding the disconnection operation of the vacuum disconnector in the closed state, the tripping link 40 is bent upward by the operation of the tripping electromagnet 49.
The lower end of the toggle link 52 can be moved downward. Then, the opening/closing link mechanism 18 is instantaneously opened by releasing the force of the cutoff spring 15 that was stored during the closing operation.
As the connecting rod 59 bends, the connecting rod 59 rises, and the fixed contact 8a and the movable contact 8b open.

In addition, in the above-mentioned embodiment, the case where the spring energy storage device is used to store energy in the closing spring of the vacuum shield or the disconnector is described, but the present invention is not limited to this, and the spring energy storage device is not limited to this. It goes without saying that it can be used in various types of switches using insulating media, and can also be used to store energy in disconnection springs.

Furthermore, in order to interlock and connect the rotary drive device 20 and the spring shaft 24, a chain 26 and a sprocket 2 are used.
2 and 25, for example, a toothed belt (timing belt) and a toothed belt pulley may be used. That is, a chain or the like includes a toothed belt, and a sprocket or the like includes a toothed belt wheel.

F. Effects of the invention As explained above, according to the invention, the sprocket, etc. attached to the output shaft of a rotary drive device via a one-way clutch, and the sprocket, etc. attached to the spring shaft, are connected via a chain, etc. with sufficient slack. Since the spring shafts are interlocked and connected, the rotational force due to the inertia of the rotary drive device is not transmitted to the spring shaft as in the conventional case. Therefore, there is no need to increase the mechanical strength of the hook, latch roller, etc. as in the prior art, and there is also no need for a strong charging electromagnet for rotating the hook.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view of a vacuum shield breaker equipped with a spring energy storage device according to the present invention, Figure 2 is a perspective view of the operating device, and Figure 3 is the operation of the vacuum shield breaker. Explanatory drawings, Fig. 4 and Fig. 5 are explanatory views of the main parts,
FIG. 6 is an explanatory diagram of the operation of the vacuum shield breaker. 8... Vacuum interrupter, 18... Opening/closing link mechanism, 20... Rotation drive device, 21a... Output shaft, 22... Small sprocket, 23... One-way clutch, 24... Spring shaft, 25... Large sprocket, 26...Chain, 28...Insertion cam,
29... Closing spring, 33... Hook.

Claims (1)

[Claims for Utility Model Registration] A spring shaft is interlocked and connected to a rotary drive device via a one-way clutch, and the spring shaft is provided with an operating spring that stores energy by approximately half a rotation of the spring shaft and releases energy by approximately half a rotation of the spring shaft. One end is connected, and the other end of the operating spring is fixed to a fixed part, and a hook is provided to hold this operating spring in a stored state and restrict the remaining half rotation of the spring shaft, and when the restriction on the spring shaft is released, the link is released. In a spring energy storage device for a switch in which a spring shaft is provided with an operation cam that extends the mechanism and closes the contacts of the switch, a sprocket, etc. is provided on the output shaft of the rotary drive device via a one-way clutch, and the sprocket, etc. and the spring shaft are connected. 1. A spring storage device for a switch, characterized in that a rotational drive device and a spring shaft are interlocked and connected by winding a chain or the like having sufficient slack over a sprocket or the like provided in the spring shaft.