JPH07245045A - Operating mechanism of vacuum circuit breaker - Google Patents

Abstract

PURPOSE:To prevent a deposit phenomenon of a main contact and a damage of component parts resulting from the making operation when an energy accumulating spring is not energized. CONSTITUTION:The lower end of a link 18 is connected to the base end of a charge and discharge detecting lever 30, and the lower end of an indicator 6 and the upper end of a link 5 are connected to the upper end of the link 18. To the lower end of the link 5, the rear part of a making drive lever 3 is connected through a pin 13. The upper end at the front side of the making drive lever 3 is connected to the middle part of a making lever 4. The rear end of the making lever 4 is held fluactuatable to a base 8 through a pin 12, and the front part of the pin 12 is held to the base 8 through a spring 24 and a pin 10. At the upper part of a frame 9, a paddle 2 is provided fluctuatable by a latch 19, and the upper end of the paddle 2 is locked to the lower end of a making drive lever 3. To the ratch 19, the upper end of a making catch 1 is engaged, and the rear end of the making catch 1 is held by a pin 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum circuit breaker, and more particularly to improvement of an operating mechanism of the vacuum circuit breaker.

[0002]

2. Description of the Related Art An example of a conventional vacuum breaker operating mechanism is shown in FIG. In FIG. 5, one end of a rotary spring (not shown) is fixed to the cam shaft 34, and one end of the drive lever 33 is inserted through a pin into a cam groove 35 formed eccentrically on the disc 27 integral with the cam shaft 34. It is inserted and always engaged with the cam groove 35.

The drive lever 33 is swingably provided via a support shaft 33a at an intermediate portion, and the other end thereof is connected to a movable side of a main contact 32 of a vacuum circuit breaker which is not described in detail. The tip of the lever 31 fixed to the cam shaft 34 is held by the catch 1A, and the catch 1A is held by the latch 19A. On the disc 27,
The spiral stripe 28 is formed.

A groove 36 is formed in a wheel 37 on the outer peripheral portion of the disk 27, and a top 29 is slidably attached to the groove 36 and the spiral line 28. The base end of the discharge detection lever 30, which is swingably provided by a pin loosely fitted in an oval hole in the intermediate portion, enters the groove 36 of the wheel 37 and is in contact with the upper surface of the top 29.

In the operation mechanism of the vacuum circuit breaker configured as described above, when the latch 19A is swung counterclockwise from the state shown in FIG. 5 to make the closing catch 1A swing upward, the closing operation is performed. The cam shaft is driven by the driving force of a rotating spring (not shown).
The 34, disc 27, cam groove 35, and spiral strip 28 are all shown in FIG.
At 180 degrees counterclockwise, the lever 31 also swings 180 degrees counterclockwise as shown in FIG.
The tip of the abuts against the trip catch 51 shown in the lower left and stops. At this time, the top 29 follows the spiral line 28,
It moves counterclockwise in the groove 36 and comes to the position of the outer end A1 of the spiral line 28.

On the other hand, the base end of the discharge detection lever 30 has a top 29.
6 is pushed to the outside of the groove 36 and slightly rocked counterclockwise as shown in FIG. 6, and the tip of the discharge detection lever 30 is in an operating state.

In FIG. 6, the latch 52 holds the tip of the catch 51 with which the tip of the lever 31 whose base end is fixed to the cam shaft 34 abuts. Further, the main contact 32 is held in the closed state by the other end of the drive lever 33 whose one end is fitted in the cam groove 35.

When the discharge detection lever 30 is activated, the switch 39 for starting / stopping the electric motor 38 is closed at the tip of the discharge detection lever 30, the electric motor 38 rotates, and the wheel 37 is rotated.
While rotating, the base end of the discharge detection lever 30 comes into contact with the outer periphery of the wheel 37 and holds the operating state of the discharge detection lever 30.

The top 29 rotates together with the groove 36 and moves in the groove 36 along the stationary spiral stripe 28, and when the wheel 37 makes one rotation, the top 29 moves at one end B of the spiral stripe 28.
Since it moves to the position 1 as shown in FIG. 7, the base end of the discharge detection lever 30 also falls into the groove 36 of the wheel 37 to be in the returning state, the switch 39 of the electric motor 38 is opened, and the electric motor 38 stops.

Normally, the contact opening operation is performed from the state shown in FIG. 7, the cam groove 35 and the spiral line 28 rotate, and the main contact 32 of the circuit breaker shown in FIG. 5 is opened.

Further, the trip-free concept of the vacuum circuit breaker allows the open circuit operation to be continued from the closed state shown in FIG. However, if the rotating spring is repeatedly closed and the opening operation is repeated before the power is stored, the force of the rotating spring will be insufficient and the main contacts of the vacuum circuit breaker will stop midway opening and closing, causing a dangerous state such as welding. .

In the conventional vacuum breaker operating mechanism,
When the above rotary spring is used, as shown in FIG. 6, the discharge detection lever 30 and the stopper 50 are connected via the link 18 and the pin as shown in FIG. The L-shaped engaging portion formed on the rear end is the latch 19A.
By engaging with and preventing the rotation of the latch 19A, the closing operation before the completion of energy storage is prevented, and as shown in FIG. 7, the energy storage of the rotary spring is completed, and the discharge detection lever 30 returns. Then, the stopper 50 and the latch 19A are disengaged, and the closing operation becomes possible.

[0013]

However, in the conventional vacuum circuit breaker operating mechanism having such a structure, if an excessive operating force is applied, the stopper 50 is deformed to perform the closing operation. There is a risk of causing
If the closing operation is carried out, there is a possibility that a half closing state occurs, the contact pressure of the main contact is insufficient and the main contact is welded, and the main contact cannot be operated by the cutoff signal, that is, the opening signal, and the cutoff cannot be performed.

Therefore, in order to solve the above problems, the present invention prevents erroneous input due to excessive operating force,
An object is to provide an operating mechanism of a vacuum circuit breaker capable of preventing damage to parts and welding of main contacts.

[0015]

According to a first aspect of the present invention, there is provided a cam which swings by the release of the biasing spring to open and close the main contact, and a state of the biasing spring which is engaged with the cam. In the operating mechanism of the vacuum circuit breaker, which has a detection lever that detects the pressure and a lever that is fixed to the cam and whose main contact is locked to the catch, the paddle that locks the catch and the It is characterized in that a closing lever for releasing the engagement with the paddle is provided in association with the detection lever by releasing the biasing spring.

The invention according to claim 2 is a cam that swings by the release of the biasing spring to turn the main contact on and off via a lever, and a biasing spring that engages with this cam and swings. In the operating mechanism of the vacuum circuit breaker equipped with a detection lever that detects the state of, and a lever that is fixed to the cam and the main contact is off and the tip is locked to the catch, the paddle that locks the catch with the latch and this It is characterized in that a closing lever is provided which engages with the paddle and releases the engagement with the paddle by interlocking with the detection lever and the link connected to the detection lever by releasing the biasing spring.

Further, according to the invention described in claim 3, a cam that swings by the release of the biasing spring to open and close the main contact via a lever, and one side of this cam engages to swing the cam. In the operation mechanism of the vacuum circuit breaker, which includes a detection cover that swings to detect the state of the biasing spring, and a lever that is fixed to the cam on one side and the main contact is off and the tip is locked to one side of the catch, There is a swingable paddle that locks the other side of the catch with a latch, and a paddle that engages with this paddle and swings in conjunction with a link that is connected to the other side of the detection lever by the release of a biasing spring. It is characterized in that a closing lever for releasing the engagement and an armature for driving the closing lever by a closing signal of the main contact to release the locking of the lever by the paddle and the catch are provided.

[0018]

[Function] When the biasing spring is in the released state, the closing lever also swings in accordance with the swinging detection lever, and the engaging portion of the closing lever with the paddle is retracted from the paddle. The paddle does not rock when a force is applied, and therefore the catches and levers that engage this paddle do not rock.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an operating mechanism of a vacuum circuit breaker according to the present invention will be described below with reference to the drawings.

FIG. 1 is a right side view showing a part of an operating mechanism of a vacuum circuit breaker according to the present invention, showing a power storage state. Figure 2
FIG. 3 is a front view showing a part of the operating mechanism of the vacuum circuit breaker according to the present invention, FIG. 3 is a partially enlarged view of FIG. As described above, the armature rod 20 is operated by the solenoid coil 7 to perform the closing operation.

FIG. 4 is a right side view of a part of the operating mechanism of the vacuum circuit breaker of the present invention, showing a released state, (a) showing a normal state, and (b) shown in the upper center. This is a state in which the solenoid coil 7 is used for the closing operation. 1 to 4,
Similar to FIGS. 5 to 7 shown in the related art, the rotary spring is not shown, and in FIGS. 2 to 3, the electric motor 3 shown in FIGS.
8, the structure of the cam 35 and the discharge detection lever 30 are also shown in Figs.
Since it is the same as, it is omitted. However, in FIG. 1, an electric motor 38 and the like are added to FIG.

First, the structure of the vacuum circuit breaker of the present invention will be described with reference to FIGS. 1, 2 and 3.

In FIG. 1, the closing catch 1 shown by a broken line in the central portion corresponds to the closing catch 1A shown in FIGS. The closing catch 1 which supports the tip of the lever 31 which receives a counterclockwise rotational force from a rotation spring (not shown) has its rear end supported by a pin 21 shown in FIG.

The operation of the input catch 1 is performed by the frame 9
The upper end of the latch 19 is abutted and locked to the half-moon portion of the latch 19, which is swingably provided on the upper front side of the latch 19.
The paddle 2 fixed to the latch 19 is pulled counterclockwise in FIG. 1 by the return spring 17 provided at the front end of the frame 9, and the rear end is locked by the stopper 22.

Here, when the paddle 2 is rotated clockwise, the closing catch 1 and the latch 19 are released, and the cam shaft 34, the cam groove 35, and the disc 2 are driven by the force of a rotating spring (not shown).
7. The spiral strip 28 swings in the counterclockwise direction together with the lever 31, and the main contact point is closed as in the operation mechanism of the vacuum circuit breaker shown in FIGS.

On the upper end of the frame 9 is mounted a base 8 having a letter-shape in FIG. 2 and a substantially L-shape in FIG. 1, and the base 8 has a pin penetrating at the center rear portion thereof. 12
The rear end of the closing lever 4 is swingably supported by an intermediate rear portion of an indicator 6 for indicating the release and accumulation of the rotation spring by a pin 10 penetrating the upper portion. The position of the closing lever 4 is held by a return spring 24 whose lower end is locked in front of the pin 12 and whose upper end is locked by the pin 10 and a stopper 23 with which the front end upper surface of the closing lever 4 contacts. .

A pin 14 is provided on the closing lever 4 in a direction orthogonal to the plane of the drawing in FIG. 1. The upper portion of the closing drive lever 3 is swingably held by the pin 14 and the rear end of the indicator 6 is held. A pin 11 is fixed to the pin 11, and the upper end of the link 5 is supported by the pin 11 via an elliptical hole. Furthermore, the rear part of the closing drive lever 3 and the lower end of the link 5 are
Connected at 13.

In the state shown in FIG. 1, the indicator 6 is in the energy storage state as shown in FIG. 2 due to the link 18 whose upper end is connected to the rear end of the indicator 6 through the pin 11 and which is vertically provided on the rear portion of the frame 9. It is indicated by the nameplate on the front.

A coil spring 25 is inserted between the upper portion of the link 5 and the pin 11 in a compressed state, and the coil spring 25 pins the closing drive lever 3 via the pin 13 at the lower end of the link 5. The closing drive lever 3 is locked on the rear surface 26 of the closing lever 4 by applying a torque for swinging clockwise around the axis 14.

A solenoid coil 7 for driving and operating the closing lever 4 is vertically housed in the center of the base 8, and the lower end of an amateur rod 20 penetrating the axis of the solenoid coil 7 is located in the center of the closing lever 4. The closing lever 4 can be oscillated directly counterclockwise by being opposed to the front upper surface with a predetermined gap.

Next, the operation of the operation mechanism of the vacuum circuit breaker of the present invention thus constructed will be described.

First, referring to FIGS. 1 and 2A, the closing operation of this operating mechanism in the energy storage state will be described. The rotary spring (not shown) is now in the energy storage state. Further, the indicator 6 which is swingably supported by the base 8 by the pin 10 is
When the discharge detection lever 30 shown in the lower part of FIG. 1 is at the position shown in FIG. 1, the rear part is pulled downward by the link 18 whose lower end is connected to the rear end of the discharge detection lever 30, and the state shown in FIG. It is maintained at and displays the energy storage status.

In this state, the spring 25 at the upper end of the link 5
By applying a torque to swing the closing drive lever 3 in the clockwise direction via the link 5, the closing drive lever 3 is locked on the rear surface 26 of the closing lever 4 as described above.

Here, when a closing command is input to the vacuum circuit breaker to excite the solenoid coil 7 and the amateur rod 20 is attracted and lowered, the upper end of the closing lever 4 is pushed by the lower end of the amateur rod 20, and this closing is performed. The lever 4 swings counterclockwise about the pin 12 at the rear end as an axial point.

Then, the closing drive lever 3 whose upper end upper surface is in contact with the back surface 26 of the closing lever 4 is also closed.
At the same time, it swings counterclockwise and pushes the upper end of the paddle 2 at the lower end. The paddle 2 is pushed by the closing drive lever 3 and swings clockwise with the half-moon shaft 19 about the half-moon shaft 19.

Then, the engagement state between the half-moon shaft 19 and the closing catch 1 located below the half-moon shaft 19 is released, and the closing catch 1 swings in the clockwise direction to allow the closing catch 1 and the lever 31 to move. The engagement state is released, the lever 31 swings counterclockwise by the rotational force of a rotary spring (not shown), the cam 35 also rotates, and the main contact 32 of the vacuum circuit breaker as described in FIGS. Is thrown in.

Next, the closing operation in the released state will be described. FIG. 4A shows a state in which the operation unit from the electric motor to the main contact is shown in FIG. 6, and as shown in FIG. 6, the discharge / accumulation detection lever 30 is in an operating state.

As in the case where the discharge detection lever 30 shifts from the state shown in FIG. 5 to the operation state shown in FIG. 6, as shown in FIG.
The indicator 6 shown in FIG. 2 is driven via a link 18 and swings counterclockwise from the energy storage display state shown in FIGS.
It stops in the horizontal state shown in FIG.

By the swinging of the indicator 6, the link 5 also follows and moves upward, and the closing drive lever 3 also follows the link 5, and the pin 14 pivotally supported by the closing lever 4 is pivoted. Is swung counterclockwise, and the engagement between the closing drive lever 3 and the paddle 2 is released.

In the state of FIG. 4 (a), if the armature rod 20 is attracted and lowered by the closing signal input to the vacuum circuit breaker, the upper surface of the closing lever 4 is pushed, and the closing lever 4 is counterclockwise. Rocks in the direction. Then pin 14
The closing drive lever 3, which is swingably supported by, also swings counterclockwise following the closing lever 4. However, at this time, since the closing drive lever 3 and the paddle 2 are not in contact with each other, the paddle 2 does not swing.

Therefore, at this time, the latch shown in FIG.
When 52 is rotated to disengage the trip catch 51 from the lever 31, the vacuum circuit breaker opens and the lever 31 moves to the position shown in FIG.
Engage with the closing catch 1 as shown in (b). However, as described above, even if the amateur rod 20 is pushed down, the paddle 2 does not operate, so that the re-insertion operation can be prevented.

As described above, according to the operating mechanism of the vacuum circuit breaker, if the closing operation is attempted when the rotary spring is in the released state, the closing drive lever 3 swings against the paddle 2 and the paddle 2 moves. Since the 2 and half-moon shaft 19 do not swing, even if the parts are deformed or damaged when the closing operation is performed by an excessive force, the closing operation of the vacuum circuit breaker can be prevented.

As described above, in the operating mechanism of the vacuum circuit breaker using this type of rotary spring, both the throwing force and the opening force can be given by one rotary spring, so the energy of the spring is reduced. This is advantageous in terms of size and weight reduction because it is possible to simplify the structure, but with the conventional operating mechanism, if the closing operation is performed when over-discharging, it becomes a half-closed state. However, the contact state becomes unstable, the contact pressure is insufficient, and there is a risk of overheating or the inability to cut off due to contact welding.

In order to prevent this, conventionally, the closing catch is mechanically locked so that it does not operate even when a closing operation force is applied. However, in the case of mechanical locking,
If an abnormally large force is applied, it may be damaged and the closing operation may be performed.

According to the operating mechanism of the vacuum circuit breaker of the present invention,
Since the closing operation is prevented by disengaging the closing catch and the closing drive lever, even if it is damaged, the closing operation can be blocked, further improving safety. be able to.

[0046]

As described above, according to the invention of claim 1,
A cam that swings due to the release of the biasing spring to turn on / off the main contact, a detection lever that engages with this cam to detect the state of the biasing spring, and a main contact fixed to the cam that catches when the main contact is turned off. In a vacuum circuit breaker operating mechanism equipped with a lever that is locked to the paddle, the paddle that locks the catch is engaged with the paddle by engaging the paddle and interlocking with the detection lever by releasing the biasing spring. By providing the closing lever for releasing, when the biasing spring is in the released state, the closing lever is also swung in accordance with the swinging detection lever to retract the engaging portion of the closing lever with the paddle from the paddle. , The paddle does not swing even when the closing action is applied to the closing lever, and therefore the catch and the lever engaged with this paddle also do not swing, preventing erroneous closing due to excessive operating force and damaging component parts. Prevent welding of the main contacts Operation mechanism of the vacuum circuit breaker can can be obtained.

According to the second aspect of the present invention, a cam that swings by the release of the biasing spring to turn the main contact on and off via the lever, and a cam that engages with this cam and swings to be attached. In the operating mechanism of the vacuum circuit breaker equipped with a detection lever that detects the state of the bias spring and a lever that is fixed to the cam and whose main contact is off and the tip is locked to the catch, a paddle that locks the catch with a latch. , The biasing spring is released by providing a closing lever that engages with this paddle and releases the engagement with the paddle by interlocking with the detection lever and the link connected to this detection lever by releasing the biasing spring. In the state, the closing lever is also swung according to the swung detection lever, the engaging portion of the closing lever with the paddle is retracted from the paddle, and the paddle is swung even if a closing operation is applied to the closing lever. No, so engaged with this paddle Since Yatchi and lever also does not swing,
It is possible to obtain an operating mechanism of a vacuum circuit breaker that can prevent erroneous input due to an excessive operating force and can prevent damage to component parts and welding of main contacts.

Further, according to the invention of claim 3,
A cam that oscillates when the urging spring is released and opens and closes the main contact via a lever, and a detection cover that detects the state of the urging spring that swings when the cam engages and one side oscillates. In the operating mechanism of the vacuum circuit breaker equipped with a lever, one side of which is fixed to the cam and the main contact is in the off state and the tip of which is locked to one side of the catch, the other side of the catch is locked by a latch. The paddle and the closing lever that engages with this paddle and swings in conjunction with the link connected to the other side of the detection lever by the release of the biasing spring to release the engagement with the paddle and the closing signal of the main contact. By providing an armature that drives the closing lever to release the locking of the lever by the paddle and the catch, when the biasing spring is in the released state, the closing lever is also swung according to the swinging detection lever, From the paddle to the engagement part with the paddle of Even if the closing action is applied to the closing lever, the paddle does not swing, and the catches and levers engaged with this paddle also do not swing, preventing erroneous loading due to excessive operating force, etc. It is possible to obtain a vacuum breaker operating mechanism capable of preventing damage to parts and welding of main contacts.

[Brief description of drawings]

FIG. 1 is a right side view showing an embodiment of a vacuum circuit breaker of the present invention.

FIG. 2 is a partially enlarged left side view of FIG.

FIG. 3A is a partially enlarged view of FIG. (B) is
The figure which shows the state which transfers to the closing operation from the state of (a).

FIG. 4A is a view corresponding to FIG. 3A and shows a state in which the energy storage spring is released. (B) is a figure which shows the state which the armature for injection operated from the state of (a).

FIG. 5 is a view showing an example of an operation mechanism of a conventional vacuum circuit breaker.

FIG. 6 is a diagram showing a state in which the state of FIG. 5 is changed to a closing state.

FIG. 7 is a diagram showing a state in which the state of FIG. 6 has transitioned to a closing completion state.

[Explanation of symbols]

1 ... Input catch, 2 ... Paddle, 3 ... Input drive lever,
4 ... closing lever, 5, 18 ... link, 6 ... indicator,
7 ... Solenoid coil, 8 ... Base, 9 ... Frame, 1
0,11,12,13,14,21 ... Pin, 15,17,24 ... Spring, 1
6, 22, 23 ... Stopper, 25 ... Coil spring, 27 ... Disc, 28
… Spiral strip, 30… Discharge detection lever, 31… Lever, 32
… Main contact, 33… Drive lever, 34… Cam shaft, 35… Cam groove,
36 ... Groove, 37 ... Wheel, 38 ... Electric motor, 39 ... Switch.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junji Fujiwara No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu factory

Claims (3)

[Claims] 1. A cam that swings by the release of an urging spring to open and close a main contact, a detection lever that engages with the cam and detects the state of the urging spring, and is fixed to the cam. In a vacuum circuit breaker operating mechanism including a lever that is locked to a catch when the main contact is in the off state, the paddle that locks the catch and the detection by the release of the biasing spring that engages with the paddle. An operating mechanism for a vacuum circuit breaker, comprising a closing lever for interlocking with the lever and releasing engagement with the paddle. 2. A cam that swings when the biasing spring is released to open and close a main contact via a lever, and a detection lever that engages with this cam and swings to detect the state of the biasing spring. In an operating mechanism of a vacuum circuit breaker equipped with a lever fixed to the cam and having a tip locked to a catch when the main contact is off, a paddle that locks the catch with a latch, and a paddle that engages with the paddle. An operating mechanism for a vacuum circuit breaker, comprising: a closing lever that releases the engagement between the detection lever and a link connected to the detection lever by releasing the biasing spring in association with the detection lever. 3. A cam which swings by the release of a biasing spring to open and close a main contact via a lever, and one side of which engages with this cam and swings by the swinging of the cam to bias the biasing spring. In the operating mechanism of the vacuum circuit breaker, the other side of the catch is provided with a detection cover that detects the state of the above, and a lever that is fixed to the cam on one side and the main contact is open and the tip is locked to one side of the catch. Between the swingable paddle that locks with a latch and the paddle that is engaged with the paddle and swings in conjunction with a link connected to the other side of the detection lever by the release of the biasing spring. An operation of the vacuum circuit breaker, which is provided with a closing lever for releasing the engagement and an armature for driving the closing lever by a closing signal of the main contact to release the locking of the lever by the paddle and the catch. mechanism.