JP2001143579A - Breaker operation mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a breaker operation mechanism for reducing the driving force of the operation part. SOLUTION: A pair of guide plates 4A are provided with a central guide groove 4a, a rear guide groove 4b, and a front guide groove 4c. Arranged between the pair of guide plates 4A is a lever 1 with the central portion connected to the upper end of a connecting rod 3, whose lower end has rollers 17A on both ends and a piece 18 at the center via pins. The rear end of the lever 1 is provided with a roller 17B guided by the guide groove 4b, and the front end with a roller 17C guided by the guide groove 4c. The roller 17A is fitted to the guide groove 4a. The guide groove 4b has its lower end provided with a rearward curved engaging cut, while the guide groove 4c has its upper end provided with a forward curved engaging cut 4e. Starting the breaker, the stoke of the pneumatic cylinder 2A is accelerated by the lever 1 to drive the operation rod 5, and then, the lever 1 enhances the upward pushing force in wiping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a circuit breaker operating mechanism.

[0002]

2. Description of the Related Art FIG. 9 is a right side view showing an example of an operation mechanism of a conventional circuit breaker incorporated in a vacuum circuit breaker. The left side of FIG. This shows the state when the vacuum valve is opened.

[0003] In FIG. 8, the lower end surfaces of a pair of guide plates 4B provided in front of a vacuum circuit breaker (not shown) and fixed to a fixed portion of an operating mechanism via a mounting hole 4g of a bent portion at a rear end are provided. A dynamic pneumatic cylinder 2B is vertically fixed by a bolt shown by a broken line via an upper end flange, and a piston rod 2b of the pneumatic cylinder 2B protrudes upward from a bottom plate of the guide plate 4B.

A guide groove 4 is provided at the center of a pair of guide plates 4B.
The lower end of the closing and holding latch 6B is supported below the guide groove 4d via a shaft 6a fixed to one guide plate 4B.

The lower part of the operating rod 5 made of a square bar is loosely fitted vertically between the pair of guide plates 4B.
The lowering position is regulated by a stopper (not shown),
The lower end surface of the operation rod 5 is the piston rod 2 of the pneumatic cylinder 2B.
It is opposed to the upper end surface of a.

[0006] At the lower end of the operating rod 5, a pair of feeding and holding rollers 5b are mounted on both sides of the pins via pins, and the feeding and holding rollers 5b are fitted into guide grooves 4d formed in the guide plate 4B. I agree.

A rear end of a tension spring 7 is locked at a middle portion of the closing and holding latch 6B via a pin, and a front end of the tension spring 7 is locked by a pin fixed to a front end of the guide plate 4B. With the return force of the tension spring 7, the closing and holding latch 6B
The front surface of the claw portion formed on the upper part of the
Is pressed against the back.

On the back side of the upper part of the closing latch 6B,
A contact plate 6b for operating a lever of a limit switch (not shown) for detecting the operation of the closing holding latch 6B is fixed by bolts.

Slightly above the middle portion of the operating rod 5, a hook at the upper end of the open spring 12 is locked via a pin 12a, and the hook at the lower end of the open spring 12 is connected to the upper end of the center of the guide plate 4B. Is fixed via a pin 12b fixed to the
Is slightly extended, and as a result, the lower end surface of the operation rod 5 is pressed by the above-described stopper that regulates the lowering position of the operation rod.

A strip 5d is formed at the upper end of the operating rod 5, and an oblong hole is formed at the upper end of the strip 5d. A flange 5c having a square hole at the center is inserted into the band plate portion 5d from above.

A wipe spring 8 having a larger spring constant than the open-circuit spring 12 is loosely fitted above the flange 5c, and a flange 5f having the same shape as the flange 5c is inserted above the wipe spring 8. ing.

A connecting pipe 5e is inserted above the flange 5f. A connecting hole is formed in the upper end of the connecting pipe 5e, and a pin is inserted into the connecting hole and the oblong hole of the upper end of the strip 5d. 9b is inserted.

Behind the connecting pipe 5e, there is provided a rotating shaft 9a supported via a bearing on a frame (not shown) of the vacuum circuit breaker, and a reversing lever 9 is fixed to the rotating shaft 9a.
The front end of the reversing lever 9 is connected to the connecting pipe 5e and the upper ends of the strips 5d via the pins 9b described above.

An upper end of a connecting rod 10a is connected to a rear end of the reversing lever 9 via a pin 9c. A lower end of the connecting rod 10a is connected to an upper end of the insulating operating rod 10, and a lower end of the insulating operating rod 10. The movable-side energizing shaft 10b suspended from the through-hole penetrates a contact plate fitted to a not-shown movable-side conductor, and further passes through a movable-side end plate of a vacuum valve 11 provided below and a bellows (not shown). .

The vacuum valve 11 has a movable contact 11a fixed to the lower end of the movable energized shaft 10b, and a movable contact 11a
A fixed-side contact 11b opposed to the fixed-side contact 11b with a predetermined gap therebetween is shown below, and a fixed-side energized shaft 11c brazed to the lower surface of the fixed-side contact 11b and penetrating through the fixed-side end plate is shown.

Next, the closing operation and the opening operation of the operating mechanism of the circuit breaker thus configured will be described in order. First, in FIG. 9, a pneumatic valve (not shown) connected to the pneumatic cylinder 2B is operated by the input signal input to the vacuum circuit breaker in FIG. 9, and when the piston rod 2b rises, the upper end of the piston rod 2b The operation rod 5 having the lower end opposed thereto rises as shown by the arrow G1 against the return force of the open circuit spring 12.

When the operating rod 5 is lifted, the reversing lever 9 connected to the strip 5d at the upper end of the operating rod 5 via the pin 9b causes the rotating shaft 9a to serve as a supporting axis, as shown by arrows G2 and G3. It swings clockwise, and with this swing, the insulated operating rod 10 connected to the rear end of the reversing lever 9 via a pin 9c.
Also moves down as shown by the arrow G4, and the movable contact 11a at the lower end of the movable energized shaft 10b contacts the fixed contact 11b.

When the piston rod 2b is further raised, the open-circuit spring 12 is further extended, and the wipe spring 8 inserted between the upper flange 5c of the operation rod 5 and the lower flange 5f of the connecting pipe 5e is shown in FIG. Compress as shown, strip
d protrudes from the upper end of the connecting pipe 5e and contacts the movable side contact 11a of the vacuum valve 11 via the connecting pipe 5e, the reversing lever 9, the insulating operation rod 10, and the movable side conducting shaft 10b in proportion to the compression amount of the wipe spring 8. The fixed side contact 11b is pressed by pressure.

When the piston rod 2b further rises by a predetermined stroke, the movable spring contact 8 is compressed by the compression of the wipe spring 8.
11a is pressed by the fixed contact 11b with a predetermined contact pressure, and the closing holding latch 6B, whose front surface is in contact with the closing holding roller 5b, is deflected with respect to the lower shaft 6a by the return force of the tension spring 7. Swings clockwise.

Then, the upper surface of the claw formed at the upper end of the closing and holding latch 6B is opposed to the lower surface of the closing and holding roller 5b, and the contact plate 6b activates a limit switch (not shown) so that the contact of the limit switch is changed. By operating the solenoid valve of the pneumatic circuit of the connected pneumatic cylinder 2B,
The pneumatic cylinder 2B is driven to lower the piston rod 2a.

As a result, the operating rod 5 by the return force of the opening spring 12 is actuated by the closing and holding roller 5b and the closing and holding latch 6.
And the contact pressure between the contacts of the vacuum valve 11 is maintained by the wipe spring 8 in a completely compressed state.

Next, in the opening operation, when a trip coil (not shown) is excited by an opening signal input to the vacuum circuit breaker, the armature of the trip coil operates to lower the closing latch 6B. Is pivoted clockwise about the shaft 6a of the shaft.

Then, the operating rod 5 to which the pulling force has been applied downward by the opening spring 12 and the wipe spring 8 is driven downward. When the wipe spring 8 is extended by a predetermined value by this lowering operation, the contact drive lever 9 swings counterclockwise, and the operation rod 5 and the contact drive whose operation is accelerated by the biasing force of the wipe spring 8 and the open spring 12. With lever 9 and insulating operating rod 10,
The movable contact 11a is separated from the fixed contact 11b at an accelerated opening speed to extinguish an arc generated between these contacts.

The input holding roller 5b, which has been lowered together with the operation rod 5, is pushed back on the rear side by the input holding latch 6 which swings clockwise and then returns counterclockwise again by the tension spring 7 as shown in FIG. Is done.

[0025]

However, in the conventional circuit breaker operating mechanism constructed as described above, the stress applied to the piston rod 2b of the pneumatic cylinder 2B at the time of closing is caused by the movable-side contact 11a being fixed to the fixed-side contact. It increases rapidly after contacting 11b.

FIG. 8 shows the piston rod 2 of the pneumatic cylinder 2B.
The relationship between the stroke a and the reaction force (generated stress) applied to the piston rod 2a is shown. When the movable contact comes into contact with the fixed contact, the stress sharply increases.

Therefore, in the conventional pneumatic cylinder incorporated in the operation mechanism of the circuit breaker, the maximum stress B2 in FIG.
Therefore, not only does the consumption of compressed air increase, but also the components of the operating mechanism driven by the pneumatic cylinder must have a strength corresponding to this maximum stress B2. Must be designed.

Then, since the weight and inertia of the components of the operating mechanism increase, the closing operation and the opening operation (acceleration at opening) are performed.
Of the vacuum circuit breaker, and there is a possibility that the breaking durability (breaking capacity) of the vacuum circuit breaker may decrease. Therefore, an object of the present invention is to provide an operating mechanism of a circuit breaker that can reduce the driving force and the strength of components.

[0029]

According to a first aspect of the present invention, there is provided an operating rod for applying a movable contact to a fixed contact via a wipe spring to open a pole, and an actuator for driving the operating rod in an axial direction. In the operation mechanism of the circuit breaker provided, the intermediate part is connected to the actuator via the link, and the operation rod speeds up at the beginning of the closing operation by the actuator by swinging and decelerates the operation of the operation rod at the later stage of the closing operation And a lever lever for increasing the operating force of the actuator and pressing the movable contact against the fixed contact via a wipe spring.

According to a second aspect of the present invention, there is provided a guide having a first guide for guiding one side of the lever and a second guide for guiding the other side of the lever. And

With such a means, in the invention corresponding to the first aspect, the pressing force required for compressing the wipe spring at the latter stage of the closing operation is increased by the swinging lever. In the invention corresponding to claim 2, the swinging lever is moved to the first position.
And the second guide portion, the closing operation force is increased by the reason in the latter stage of the closing.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the circuit breaker operating mechanism of the present invention will be described below with reference to the drawings. FIG. 1 is a right side view showing an embodiment of an operation mechanism of a circuit breaker of the present invention,
It is a figure corresponding to FIG. 9 shown by the prior art. FIG. 2 is a right side view showing the state of the operation mechanism of the circuit breaker when the vacuum valve in the open state of FIG. 1 is turned on.
FIG.

FIG. 3 is an enlarged detailed view of the operation mechanism of the circuit breaker shown in FIG. 1 from which the lower part of the pneumatic cylinder is omitted. However, the drawing of the components from the reversing lever to the vacuum valve is simplified due to space limitations.

FIGS. 1 and 3 are different from FIG. 9 shown in the prior art in that a guide plate and a loading mechanism incorporated in the guide plate are different from each other in that a pneumatic cylinder as an actuator is downsized. The structure from the operation rod to the vacuum valve is the same as that in FIG. Therefore, the same parts are denoted by the same reference numerals and description thereof will be omitted.

In FIGS. 1 and 3, a guide groove 4a is vertically formed in the center of a pair of guide plates 4A, which are smaller than the guide plate 4B shown in the prior art, and a rear portion of the guide groove 4a is formed. , A substantially L-shaped guide groove 4b is formed vertically, and a locking portion curved backward is formed at the lower end of the guide groove 4b.

A substantially inverted L-shaped guide groove 4d is machined in front of the pair of guide plates 4A.
A locking portion 4e that is curved forward is formed, and a wide guide groove 4a is machined vertically behind and slightly above the guide groove 4c.

Among them, the guide groove 4a formed in the center portion
A guide roller 17A is fitted in the lower part of the pin, a pin 17a is inserted through the guide roller 17A, and a substantially trapezoidal top 18 is inserted into the center of the pin 17a. Is opposed to the upper end surface of the piston rod 2a of the pneumatic cylinder 2A.

The pneumatic cylinder 2A is smaller in diameter and upper and lower end plates of the cylinder tube than the pneumatic cylinder 2B shown in FIGS. 9 and 10 of the prior art.
Therefore, the pair of miniaturized guide plates 4 are connected to the pneumatic cylinder 2A by the upper ends of the four tie rods of the pneumatic cylinder 2A.
Is fixed.

A lower end of a U-shaped connecting rod 3 is connected to the pin 17a, and an intermediate portion of the lever 1 is connected to an upper end of the connecting rod 3 via the pin 1a. At the rear end of the lever 1, a guide roller 17B is provided via a pin. The guide roller 17B is provided at a locking portion formed behind the lower end of a guide groove 4b formed at the rear of the guide plate 4A. Mated.

The guide roller 17 is also provided at the front end of the lever 1.
C is provided via a pin, and the guide roller 17C
It is fitted to the lower end of a guide groove 4c formed in front of the guide plate 4A.

At a slightly intermediate position of the guide plate 4A, a closing latch 6A shown in FIG. 1 is vertically provided via a shaft 6a so as to be swingable. A lower end of the closing latch 6A has an extended state. The hook at the front end of the tension spring 7 is locked.

The hook at the rear end of the tension spring 7 is engaged with the lower rear pin of the guide plate 4A.
As in the case of FIG. 9, it is pressed against the back surface of the input holding roller 5b fitted in the guide groove 4d and supported at the lower end of the operating rod 5 via a pin. A push-up roller 5a having a diameter larger than that of the input holding roller 5b is inserted into the center of the pin into which the input holding roller 5b is inserted at both ends.

In the front of the guide plate 4A, a corner of an L-shaped lever reset lever 13 is swingably provided via a shaft, and the lever reset lever 13 is provided on the guide plate 4A.
1 and 3 prevent a counterclockwise swing from the posture shown in FIGS.

Above the lever reset lever 13, a small tension spring 14 is connected to the upper end hook portion by the guide plate 4A.
The lower hook portion of the tension spring 14 is locked to the rear end of the upper portion of the lever reset lever 13 so that the lever reset lever 13
The upper surface of the upper part is pressed against the above-mentioned pin (not shown) by the restoring force of the tension spring 14 with the intermediate shaft as a support shaft.

Next, the operation of the operating mechanism of the circuit breaker thus configured from the opening state of FIG. 1 to the closed state of the vacuum valve shown in FIG. 2 will be described. The pneumatic cylinder 2A operates according to the input signal input to the vacuum circuit breaker,
When the piston rod 2a of the pneumatic cylinder 2A rises,
The lever 1 rises via the connecting rod 3 in a state where the roller 17A at the rear end is fitted to the locking portion at the rear lower end of the guide groove 4b,
The roller 1b at the front end of the lever 1 is guided by the guide groove 4c and rises.

Then, the operating rod 5 is pushed up by the upper surface in front of the lever 1 via the push-up roller 5a at the lower end, and resists the restoring force of the open-circuit spring 12 as in FIG. And rise.

The rising distance of the operating rod 5 at this time is the distance X between the perpendicular of the center line of the operating rod 5 and the center of the roller 17B at the rear end of the lever 1, and the lower end of the connecting rod 3 in FIG. W between the pin and the roller 17B at the rear end of the lever 1
About twice the ratio of

Since the connecting rod 3 is upwardly inclined by an angle α as shown in FIG. 3, the roller 17C at the front end of the lever 1 rises while being pressed against the front end surface of the guide groove 4c. I do.

FIG. 4 shows the roller 17C at the front end of the lever 1.
Rises while being pressed against the front end face of the guide groove C, and immediately before fitting into the locking portion 4e formed on the upper left side,
That is, the state immediately before the movable contact of the vacuum valve 11 comes into contact with the fixed contact is shown.

The piston rod 2a further rises from the state immediately before the loading shown in FIG.
As soon as C passes through the entrance 4f of the locking portion 4e shown in FIG. 4 of the locking portion 4e formed in front of the upper end of the guide groove 4d, the movable contact of the vacuum valve 11 contacts the fixed contact. In addition,
At this point, the wipe spring 8 starts compression, that is, immediately before the start of the wipe operation.

When the piston rod 2a further rises, the front end roller 17C of the lever 1 comes in contact with the upper end surface of the engaging portion 4e and rolls, and moves forward according to the rise of the piston rod 2a. The rear end roller 17B comes out of the engagement portion at the lower end of the guide groove 4b and is in a free state as shown in FIG.

When the piston rod 2a further rises, the rear part of the lever 1 swings counterclockwise about the front roller 17C in the counterclockwise direction as shown in FIG. Contact.

Then, the pushing up force of the operating rod 5 by the piston rod 2a is applied to the roller 17C at the front end of the lever 1 shown in FIG.
Between the center line of the piston rod 2a and the roller 17C
FIG. 6 shows the ratio of the distance to the center line of the operation rod 5 to the distance Y.
Then it is about three times.

Therefore, when the piston rod 2a further rises, the operating rod 5 compresses the wipe spring 8 and the operating force required until the closing operation shown in FIG. 7 is completed, the operating force of the conventional circuit breaker operating mechanism shown in FIG. It is about one-third compared.

When the operating rod 5 is lifted up to the time when the wipe is completed, the closing and holding latch 6A is returned by the return force of the tension spring 7.
Swings counterclockwise and stops at a stopper (not shown), and the contact plate 6b operates a limit switch (not shown) to operate a solenoid valve of a pneumatic circuit connected to the pneumatic cylinder 2A, thereby causing pneumatic pressure. As shown in FIG. 7, the piston rod 2a of the cylinder 2A descends, and the lever 1 swings clockwise, and the roller 17B at the rear end of the lever 1 descends to the lower end of the guide groove 4b.

On the other hand, in the opening operation, as in the case of FIG. 9 shown in the prior art, the excitation of the trip coil (not shown) causes the armature of the trip coil to bring the upper part of the holding latch 6A into the closed state. The operation bar 5 is lowered by swinging the input holding latch 6A clockwise, and the upper surface on the left side of the lever 1 is pushed down by the operation bar 5 to return to the state shown in FIG.

As described above, in the operating mechanism of the circuit breaker according to the present invention, when the required input operating force until the wipe spring is compressed, that is, until the contacts of the vacuum valve come into contact, the operating rod 5 is driven. Since the speed was doubled and the pressing force of the pneumatic cylinder was doubled during the wiping operation after the contact of the contacts of the vacuum valve, which required a large operating force, without increasing the capacity of the pneumatic cylinder as an actuator,
In addition, the operation mechanism of the circuit breaker has a reduced closing time.

In the above embodiment, an example in which a pneumatic cylinder is used as the actuator has been described. However, a hydraulic cylinder may be used, or a linear motion bearing that moves linearly by rotation of a motor instead of operation by fluid may be used.

[0059]

According to the first aspect of the present invention, there is provided an operating rod for applying a movable contact to a fixed contact via a wipe spring to open a pole, and an actuator for driving the operating rod in an axial direction. In the operating mechanism of the circuit breaker, an intermediate portion is connected to the actuator via a link, and the operation of the operating rod is accelerated by swinging at an early stage of the closing operation by the actuator, and the operation of the operating rod is decelerated at a later stage of the closing operation to reduce the actuator. By providing a lever that presses the movable contact to the fixed contact via the wipe spring by increasing the operating force of the lever, the pressing force required to compress the wipe spring in the latter half of the closing operation is increased by the swinging lever. Therefore, it is possible to obtain a circuit breaker operating mechanism capable of reducing the capacity of the drive source.

According to the second aspect of the present invention, a guide having a first guide for guiding one side of the lever and a second guide for guiding the other side of the lever is provided. The swing lever is swung by the first guide portion and the second guide portion, and the throwing force is increased in the latter stage of the closing operation, so that the capacity of the drive source can be reduced. Operating mechanism can be obtained.

[Brief description of the drawings]

FIG. 1 is a right side view showing an embodiment of an operation mechanism of a circuit breaker of the present invention, showing an opened state.

FIG. 2 is a view showing the operation of the operation mechanism of the circuit breaker according to the present invention;
Indicates that the loading is completed and the trip preparation is completed.

FIG. 3 is an enlarged detail view showing an embodiment of the circuit breaker operating mechanism of the present invention.

FIG. 4 is an enlarged detailed view showing the operation of the operating mechanism of the circuit breaker of the present invention, showing an initial stage of the closing operation.

FIG. 5 is an enlarged detailed view showing the operation of the operating mechanism of the circuit breaker according to the present invention, and shows a state immediately before a wiping operation.

FIG. 6 is an enlarged detailed view showing the operation of the operating mechanism of the circuit breaker of the present invention, and shows a state immediately after the closing is completed.

FIG. 7 is an enlarged detailed view showing the operation of the operation mechanism of the circuit breaker according to the present invention, showing a process of returning to a state before closing.

FIG. 8 is a graph showing the operation of the operation mechanism of the circuit breaker of the present invention and the conventional one.

FIG. 9 is a view showing an example of a conventional operation mechanism of a circuit breaker, showing an open state.

FIG. 10 is a view showing an example of a conventional operation mechanism of a circuit breaker;
Indicates the completion state of charging.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lever lever, 1a ... Pin, 2A, 2B ... Pneumatic cylinder, 2a ... Piston rod, 3 ... Connecting rod, 4A, 4B ...
Guide plates, 4a, 4b, 4c, 4d: guide grooves, 4e: locking portions, 5: operating rods, 5a: push-up rollers, 5b: loading and holding rollers, 5c, 5f: flanges, 5d: band plate portions, 5e
... Connection pipe, 6A, 6B, closing latch, 7, 14, tension spring, 8, wipe spring, 9, reverse lever, 9a, shaft,
9b, 9c: pin, 10: insulating operating rod, 11: vacuum valve,
12: Opening spring, 13: Lever reset lever, 15, 16
… Fold line, 17A, 17B, 17C… Roller, 18… Top.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Nobuo Kawashima 1 Toshiba-cho, Fuchu-shi, Tokyo F-term in the Fuchu factory of Toshiba Corporation (reference) 5G026 LA01 LB01 5G028 AA08 EB03 EB12

Claims (2)

[Claims] An operation mechanism of a circuit breaker including an operation rod for opening a movable contact by applying a movable contact to a fixed contact via a wipe spring, and an actuator for driving the operation rod in an axial direction. An intermediate portion is connected to the actuator, and the operation of the operating rod is accelerated at the beginning of the closing operation by the actuator by swinging, and the operation of the operating rod is decelerated at a later stage of the closing operation to reduce the operating force of the actuator. An operating mechanism for a circuit breaker, further comprising a lever lever that presses the movable contact against the fixed contact via the wipe spring. 2. A guide device comprising a first guide for guiding one side of the lever and a second guide for guiding the other side of the lever. Operation mechanism of the circuit breaker according to the above.