JPH10106405A - Driving device for circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device for a circuit braker in which a motor, applied to an accumulation spring so as to accumulate energy source in the spring, is not subject to any restriction of its revolution even if an accident has happened in an electric system. SOLUTION: A mechanism 31 for engaging a toothed gear 2 with an accumulation shaft 3 is constituted of a key 37 and a movable pin 18, and this key 37 is formed as a protrusion in a periphery of the accumulation shaft 3, and the movable pin 18 is mounted to a direction of outer diameter through an excitation spring 17 under the condition of excitation all the time. This movable pin 18 is inserted into a support hole 20 and is disposed to be abuttable on a guide surface 10A of a guide plate 10. The guide surface 10A of the guide plate 10 is formed to a rotational direction side (counterclockwise direction) of the accumulation shaft 3 from the position of the key 37 at the time when the energy accumulation of the accumulation spring is completed, to result in narrowing the distance between the guide surface 10A and the the accumulation shaft 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for opening and closing a circuit breaker by the energy of a spring stored by a motor.

[0002]

2. Description of the Related Art FIG. 15 is a side view showing the structure of a conventional circuit breaker driving device. A small gear 11 is directly connected to the rotation shaft 1A of the electric motor 1, and the outer gear teeth of the gear 2 mesh with the small gear 11. The energy storage shaft 3 passes through the center of the gear 2. The gear 2 and the energy storage shaft 3 are connected to an engagement mechanism 7 described later in detail.
Are connected via A cam 34 is fixed in the axial direction of the energy storage shaft 3, and a crank lever 32 is fixed to the left end of the energy storage shaft 3 via a pin 40. A crankshaft 42 is provided at the upper end of the crank lever 32 so as to project leftward.
Is locked at the upper end. The lower end of the energy storage spring 4 is locked to the lower frame 41.

FIG. 16 is a view as seen from an arrow E in FIG. An operating rod 84 connected to a movable conductor 8A of the vacuum valve 8 via a flexible conductor 86 and an insulating rod 83 is connected to the right end of the opening / closing lever 55 via a metal fitting 57. Flexible conductor 86 and conductor 8B on the fixed side of vacuum valve 8 are connected to main circuit conductors 82 and 81, respectively. The opening / closing lever 55 is fixed to the opening / closing shaft 6 by welding, and rotates around the opening / closing shaft 6. A closing lever 53 is rotatably connected to the left end of the opening / closing lever 55 via a pin 54. Further, an input roller 52 for input is rotatably attached to the input lever 53 via a pin 51. The pin 51 is fitted into a vertically long groove (not shown) provided on a support plate 71 (not shown in FIG. 16) fixed to the lower frame 41 shown in FIG. The pins 51 move vertically. As shown in FIG. 15, in addition to the open / close lever 55, open / close levers 55A and 55B are also welded to the open / close shaft 6, and the other ends of the open / close levers 55A and 55B are connected to vacuum valves 8 (not shown) of other phases. 16 are connected via a configuration similar to that of the right half of FIG. That is, three vacuum valves 8 are provided, and are interposed in the three-phase main circuit, respectively. Three vacuum valves 8 are opened and closed by one opening and closing shaft 6.

[0004] In FIG. 16, a shaft projecting portion 33 is provided on the outer periphery of the energy storage shaft 3 so as to project upward and to be in contact with the side surface of the gear 2. Also, the gear 2 has
The gear projection 21 is provided so as to project toward the near side of the figure, and is arranged so as to be in contact with the outer periphery of the energy storage shaft 3. The gear projecting portion 21 and the shaft projecting portion 33 form an engaging mechanism 7, and as described later, the gear 2
And the energy storage shaft 3 are disconnected. Therefore, the shaft projecting portion 33 and the gear projecting portion 21 come into contact with each other at a specific position and engage with each other. A roller 35 is fixed to the cam 34, and the roller 35 is mounted on the upper portion of the closing latch 9 in FIG. The closing latch 9 has a fixed shaft 9A fixed to the support plate 71 (FIG. 15) side.
, And is always urged clockwise about the fixed shaft 9A by a spring (not shown). However, a stopper not shown prevents rotation from the position shown in FIG. 16 in the clockwise direction.

FIG. 16 shows a configuration in which the circuit breaker is shut off and the energy storage of the energy storage spring 4 is completed.
Although the energy storage spring 4 applies a rotating force to the energy storage shaft 3, since the closing latch 9 suppresses the movement of the roller 34, the cam 3
The energy storage shaft 3 integral with 4 is stopped. When an external force is applied to the closing latch 9 in a counterclockwise direction, the roller 35 is disengaged from the closing latch 9, so that the storing force of the storing spring 4 causes the cam 34 to rapidly rotate in the counterclockwise direction. Along with that, cam 3
4 presses the charging roller 52 downward, resulting in the state of FIG.

FIG. 17 is a side view showing a state immediately after the apparatus of FIG. 15 is put in. Since the closing lever 53 is pushed downward, the opening / closing lever 55 rotates counterclockwise. As a result, the operation rod 84 rises, and the vacuum valve 8 is turned on. In the state of FIG. 17, the energy of the energy storage spring 4 is stored in preparation for the next closing operation. Hereinafter, the charging operation will be described in detail.

In the state shown in FIG. 17, the relative position between the shaft protrusion 33 and the gear protrusion 21 is about half a distance from the circumferential direction of the energy storage shaft 3. When the energy storage shaft 3 rotates about half a turn, the shaft projection 33 hits the gear projection 21, and when the shaft projection 33 pushes the gear projection 21, the gear 2 and the energy storage shaft 3 become the first. Become linked. In FIG. 17, when the electric motor 1 is rotated, the small gear 11 rotates clockwise.
In conjunction with this, the gear 2 rotates counterclockwise. At this time, since the shaft projecting portion 33 and the gear projecting portion 21 are separated from each other by about half a circle, even if the gear 2 rotates, the energy storage shaft 3 and the cam 34 do not immediately rotate, and the gear 2 idles about half a circle. . The rotation of the gear 2 advances, the gear projection 21 hits the left side of the shaft projection 33, and when the gear 2 rotates counterclockwise, the energy storage shaft 3 starts rotating. By the rotation of the energy storage shaft 3, the crank lever 32 shown in FIG. 15 rotates, the crankshaft 42 moves upward, and the energy storage spring 4 is charged.

FIG. 18 is a side view showing a state in which the energy storing operation of the energy storing spring is completed in the closed state of the apparatus shown in FIG. The energy storing operation is completed when the energy storing spring 4 is fully extended to reach a dead point, that is, in a state of FIG.
Is also stopped. The stopping of the electric motor 1 is performed by detecting the state of completion of accumulation of the energy of the energy storage spring 4 by a mechanism (not shown), and shutting off a power supply switch of the electric motor 1 based on the detected state. Is done.

In the closing operation of the vacuum valve 8 in the closed state shown in FIG. 18, the opening / closing shaft 6 is rotated clockwise by the driving of a not shown spring. As a result, the charging roller 52 rises and returns to the shut-off state in FIG. 15 to 18 show the case where the energy storage spring 4 is used for closing, the configuration on the left side of the opening / closing lever 55 in FIG. Can be.

[0010]

However, the conventional apparatus as described above has a problem that when the electric system fails and the motor cannot be stopped, the motor is overloaded and fails. Was. That is, due to a failure of the electric system, an electric signal for giving a stop command to the motor is not output, or a switch for controlling the motor does not operate. The rotation of the electric motor 1 is restricted because the operation of the roller 35 is restricted by the closing latch 9, though the rotation is to be continued. As a result, the electric motor 1 is overloaded and burns out, making it inoperable. For this reason, conventionally, it has been necessary to frequently stop the operation of the circuit breaker and check the electric system, which has been a hindrance to the operation plan of the circuit breaker.

An object of the present invention is to provide a drive device for a circuit breaker in which rotation of a motor is not restricted even if an electric system fails.

[0012]

According to the present invention, in order to achieve the above object, according to the present invention, an energy storage spring for opening and closing a circuit breaker, an energy storage shaft for storing the energy storage spring, and an energy storage mechanism A gear connected to the shaft via an engagement mechanism, and an electric motor for rotating the gear, wherein the engagement mechanism engages the gear and the energy storage shaft when the energy storage spring is energized, In a breaker driving device for disengaging a gear and an energy storage shaft when a spring is released, a through hole is formed at the center of the gear, and two support plates are provided on both sides of the gear so as to close the through hole. Fixed to the surface,
An energy storage shaft is passed through the center of the through hole in the two support plates, and an elongated support hole is formed in the radial direction of the through hole.
An arc-shaped guide plate surrounding the energy storage shaft with a guide surface is disposed on both sides of the support plate, and the engagement mechanism is composed of a key and a movable pin, all of which are disposed in the through holes, and the key is a power storage device. The movable pin is protruded from the outer periphery of the shaft, is mounted in a state where the movable pin is urged in the outer diameter direction of the through-hole by an urging spring, is inserted into the support hole, and projects to the outside through the through-hole. When the energy is completely stored in the shaft, it does not come into contact with the movable pin. It is good to be done. In the completed state of the energy storage of the energy storage spring, the movable pin moves to the outer diameter side of the through hole by the urging spring, so that the movable pin does not contact the key of the energy storage axis, and the engagement mechanism is in contact with the energy storage axis. Do not engage with gears. After the discharge of the energy storage shaft, when the electric motor is driven for the energy storage operation,
The motor initially rotates only the gear with the movable pin. When the electric motor rotates for a while, the movable pin comes into contact with the guide surface of the guide plate, is guided by the guide surface and the support hole, and is gradually pushed toward the energy storage shaft. Accordingly, the movable pin comes into contact with the key of the energy storage shaft, so that the engagement mechanism is engaged, the gear rotates the energy storage shaft, and the energy storage spring is energized. When the energy storage of the energy storage spring is completed, the movable pin is no longer restrained by the guide surface of the guide plate. Therefore, the movable spring is moved by the urging spring to the outer diameter side of the through hole and the engagement mechanism is released. Thereafter, a stop command is issued to the electric motor. Thereafter, the same operation is repeated, but a stop command is issued to the electric motor due to a failure in the electric system, so that even if the electric motor keeps rotating, the electric motor does not exert a binding force. That is, when the energy storage spring completes the energy accumulation, the rotation of the energy accumulation axis is stopped, but since the movable pin has no guide surface, it moves to the outer diameter side of the through hole and passes over the head of the key and around the energy accumulation axis. Can rotate without any constraints. The movable pin is guided in the support hole in the radial direction of the through hole by the guide surface of the guide plate, but when the movable pin comes to the position of the key of the energy storage shaft, the guide surface of the guide disappears, so the key and the movable pin Never come into contact.

Further, in such a configuration, the guide surface of the guide plate may be formed by hooking the energy storage shaft in a hook shape. Thereby, the movable pin is guided by the guide surface of the guide plate in the inner diameter direction of the through hole until immediately before the completion of the energy storage of the energy storage spring, and the engagement between the movable pin and the key is ensured. Further, in such a configuration, an energy storage spring for opening and closing the circuit breaker, an energy storage shaft for storing the energy storage spring, a gear connected to the energy storage shaft via an engagement mechanism, and the gear A rotating electric motor, wherein the engagement mechanism engages the gear and the energy storage shaft when the energy storage spring is energized, and releases the engagement between the gear and the energy storage shaft when the energy storage spring is released. In the driving device for the gear, a through hole is formed at the center of the gear, and two support plates are fixed to both side surfaces of the gear so as to close the through hole. The energy storage shaft is passed through and the fixing pin is fixed to the support plate on the outer diameter side of the through hole, and a stopper having a convex portion is provided on the side opposite to the through hole of the support plate. The mechanism is composed of a key and a movable lever, all located in the through hole. The movable arm has a first arm and a second arm formed in a U-shape, the first arm is disposed on the rotation direction side of the energy storage shaft, and the second arm is arranged in the opposite rotation direction of the energy storage shaft. Side, the peak side of the movable lever is directed to the outer radial side of the through hole, the movable lever is rotatably attached to the fixed pin, and the second arm is outside the through hole via the biasing spring. One end of a guide pin that is constantly urged in the radial direction and penetrates a window opened in the support plate is fixed to the second arm, and the other end of the guide pin is arranged so as to be able to abut on the protrusion of the stopper. At the same time, it may be arranged at a position where the energy storage spring rides on the convex portion at the end of the energy storage. Accordingly, in the state where the energy storage of the energy storage spring is completed, the guide arm rides on the convex portion of the stopper, so that the first arm of the rotating lever is rotated in a direction away from the energy storage shaft. Therefore, the first arm of the rotating lever does not contact the key of the energy storage shaft, and the engagement mechanism does not engage the energy storage shaft with the gear. In this state, when the electric motor is driven for the next energy storing operation of the energy storing spring, the electric motor first rotates only the gears together with the rotating lever. When the electric motor rotates for a while, the first arm of the rotating lever comes into contact with the key of the energy storage shaft. As a result, the engagement mechanism is brought into the engaged state, the gear rotates the energy storage shaft, and the energy storage spring is energized. When the energy storage of the energy storage spring is completed, the second arm of the guide pin rides on the projection of the stopper, and the end of the first arm of the rotating lever rotates in a direction away from the energy storage axis, and the engagement mechanism is activated. Unraveled. Thereafter, a stop command is issued to the electric motor. Thereafter, the same operation is repeated, but a stop command is issued to the electric motor due to a failure in the electric system, so that even if the electric motor keeps rotating, the electric motor does not exert a binding force. That is, when the energy storage spring completes the energy storage, the rotation of the energy storage shaft is stopped, but the guide pin rides on the protrusion of the stopper. It can rotate around without any restrictions. When the rotating lever orbits through the through hole and comes to the position of the key of the energy storage shaft, the second arm of the guide pin rides on the convex portion of the stopper again, and the first arm of the rotation lever is moved from the energy storing shaft. Rotate away. Therefore, the rotating lever does not come into contact with the key.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a side view showing a configuration of a circuit breaker driving device according to an embodiment of the present invention. 15 is different from the conventional configuration of FIG. 15 in that support plates 5 are fixed to both sides of the gear 2 and guide plates 10 are further disposed on both sides of the support plate 5. Is constituted by a movable pin 18 penetrating through the support plate 5 and a key 37 protruding from the energy storage shaft 3.

FIG. 2 is a view taken in the direction of the arrow A in FIG. The difference from the conventional configuration in FIG. 16 is that the support plate 5 is formed in a disk shape, and the energy storage shaft 3 having a key 37 protruding at the center thereof penetrates. The support plate 5 is rotatably supported by the energy storage shaft 3. The guide plate 10 has an arc-shaped guide surface 10A and is bolted to a fixed claim 14 fixed to a support plate 71 (not shown in FIG. 2).

FIG. 3 is an enlarged side view of a main part of FIG. This figure is for describing the configuration of the engagement mechanism 31 in detail.
A part of the support plate 5 is cut out at the crushing line 5A so that the inside can be seen. A through hole 16 having a diameter sufficiently larger than the diameter of the energy storage shaft 3 is formed at the center of the gear 2, and two support plates 5 are provided on both sides of the gear 2 so as to close the through hole 16. It is fixed with rivets 15. In the through hole 16, a biasing spring 17 is hung on a fixing pin 19 passed between the two support plates 5. One end of the biasing spring 17 allows the movable pin 18 to move outside the through hole 16. It is constantly urged in the radial direction and presses against the inner wall 16A of the through hole 16. The two support plates 5 are provided with elongated support holes 20 (dotted lines) extending radially from the center.
The movable pin 18 is inserted through the movable pin 18 and is movably supported.
The length of the support hole 20 is substantially the same as the through hole 1 of the energy storage shaft 3 and the gear 2.
6 is selected to have a length equal to the distance from the inner wall 16A.
On the other hand, the energy storage shaft 3 is provided with a key 37 having a concave portion 37A on the side surface of the protruding portion. The protruding height of the key 37 is less than half of the through hole 16 of the gear 2.

FIG. 4 is a view on arrow B of FIG. Two guide plates 10 are arranged with a gap therebetween so as not to desirably contact both sides of the support plate 5. Both ends of the movable pin 18 supported by the support plate 5 project left and right from both sides of the support plate 5. When the gear 2 rotates and the movable pin 18 comes to the upper part, both ends of the movable pin 18 come into contact with the guide surface 10 </ b> A of the guide plate 10.

1 to 4 are the same as those of the conventional apparatus, and the same parts are denoted by the same reference characters and will not be described in detail. FIGS. 1 to 4 show a configuration in a state where the circuit breaker is in a cut-off state and the storage of the storage spring 4 is completed. In FIG. 3, the key 37 of the engagement mechanism 31 and the movable pin 18 are not engaged. That is, the movable pin 1
8 is moved toward the outside diameter of the through hole 16 in the support hole 20 by the biasing spring 17. Therefore, the movable pin 18 does not come into contact with the key 37, and therefore, the gear 2 and the energy storage shaft 3 are not connected to each other and are in a mutually free state.

Next, the operation of this device will be described. FIG.
FIG. 2 is an enlarged side view of a main part showing a state immediately after the vacuum valve 8 of FIG. 1 is turned on. In other words, this is a state in which the energy storage spring 4 has been released. The input latch 9 is released in response to the input command, and the energy storage shaft 3 is driven by the energy storage spring 4 to rotate the energy storage shaft 3 together with the key 37 in the counterclockwise direction from the state of FIG. The movable pin 1
8 remains in the same position as in FIG.

FIG. 6 is an enlarged side view of a main part showing a state in which the energy storage spring 4 is being charged from the state of FIG. When the electric motor 1 is driven from the state of FIG.
The gear 2 rotates counterclockwise with the movable pin 18.
When the movable pin 18 enters the range of the guide surface 10A of the guide plate 10 due to the rotation, the movable pin 18
A is pushed by A, moves to the inside diameter side of the through hole 16 in the support hole 20, and comes to the position where it contacts the key 37 of the energy storage shaft 3. FIG.
5 shows a state in which the gear 2 is rotated about half a circle from the state shown in FIG. 5, but the movable pin 18 contacts the right side of the key 37 and the key 37
The movable pin 18 is fitted in the concave portion 37A. When the rotation further proceeds from the state shown in FIG. 6, the rotation of the gear 2 is transmitted to the energy storage shaft 3 and the energy storage spring 4 is displaced because the movable pin 18 and the key 37 are engaged.

FIG. 7 shows a state in which the energy storage spring 4 reaches a dead point which is short of the energy storage final position. While the movable pin 18 presses the key 37 in the counterclockwise direction, the movable pin 18 further rotates about half a turn from the state of FIG. 6 to 7, since the movable pin 18 is fitted in the concave portion 37A, it is not moved toward the outer diameter side of the support hole 20. In the state shown in FIG. 7, when the energy storage spring 4 exceeds the dead point, the rotation speed of the energy storage shaft 3 becomes sharply higher than that of the gear 2, and the movable pin 18 of the key 37 moves forward. Therefore, the movable pin 18 is disengaged from the concave portion 37A and is brought closer to the outer diameter side of the support hole 20. Returning to the state of FIG.
The roller 35 of the cam 34 is locked by the latch 9 for holding, and the energy storage state of the energy storing spring 4 is maintained, thereby completing the energy storing operation.

Thereafter, the same operation as the charging and discharging of the storage spring is repeated. In FIG. 3, if the electric system fails and the motor does not stop, the storage of the storage spring 4 is stopped. When completed, the energy storage shaft 3 stops, but the electric motor 1 remains rotating. That is, since the movable pin 18 is disengaged from the key 37, only the movable pin 18 orbits around the energy storage shaft 3 together with the gear 2. After the movable pin 18 circulates around the energy storage shaft 3 for a while, it is moved toward the inner diameter side of the support hole 16 by the guide surface 10 </ b> A of the guide plate 10. However, since the key 37 is at the lower position, the movable pin 18 You can go further. Then, the movable pin 18 returns to the state of FIG. Therefore,
The binding force is not applied to the motor, and the motor is not overloaded.

FIG. 8 is an enlarged side view of a main part showing a structure of a circuit breaker driving apparatus according to another embodiment of the present invention.
FIG. 9 is a view on arrow C of FIG. The guide surface 22A of the guide plate 22 is formed about three-quarters around the energy storage shaft 3 in a hook shape. Other configurations in FIGS. 8 and 9 are the same as those in FIGS. 3 and 4, respectively, which show a state in which the circuit breaker is in the cut-off state and the energy storage of the energy storage spring is completed. I have. The guide surface 22 </ b> A is formed such that the movable pin 18 is moved toward the inner diameter side of the support hole 20 while the energy storage spring 4 is in the process of being charged. Approximately 4 before the energy storage spring becomes a dead point (the same state as in FIG. 7)
During the period of three minutes, the movable pin 18 is
Is restrained so as to be located on the inner diameter side of the support hole 20, so that the movable pin 18 and the key 37 can be reliably engaged. Therefore, the concave portion 37A of the key 37 is not always necessary.

FIG. 10 is an enlarged side view of a main part showing a configuration of a circuit breaker driving apparatus according to still another embodiment of the present invention. The engagement mechanism 36 includes a key 38 arranged in the through hole 16 and the movable lever 26 supported by the support plate 5. The key 38 protrudes from the outer periphery of the energy storage shaft 3, and the movable lever 26 is formed by forming a first arm 27 and a second arm 28 in an inverted letter shape. 28, and the mountain side of the inflection point is the through hole 16
Is oriented in the outer diameter direction. Fixing pin 25 is used as support plate 5
The fixed pin 25 supports the joint portion of the first arm 27 and the second arm 28 of the movable lever 26 so as to be freely rotatable. One end of the biasing spring 24 is hooked into a hole 5B formed in the support plate 5 and the other end thereof is abutted on a second arm 28. The movable spring 26 is moved by the biasing spring 24 around the fixed pin 25. It is always biased counterclockwise. A guide pin 30 is attached to the tip of the second arm 28. The guide pin 30 passes through a window 29 (dotted line) opened in the support plate 5 and rides on a convex portion 23A of a stopper 23 (dashed line) fixed outside the support plate 5.

FIG. 11 is a view taken in the direction of arrow D in FIG. A movable lever 26 is disposed between the pair of support plates 5, and the biasing spring 2
4 is disposed on the right side of one support plate 5. The guide pin 30 protrudes to the left of the other support plate 5, and the guide pin 3
0 is on the convex portion 23A of the stopper 23 at the lower portion of FIG. Other configurations in FIGS. 10 and 11 are the same as those in FIGS. 3 and 4, respectively, and show the state in which the circuit breaker is in the cut-off state and the storage of the storage spring 4 is completed. In this state, the first arm 27 of the movable lever 26 does not come into contact with the key 38, so that the gear 2 and the energy storage shaft 3 are in a free state from each other.

Next, the operation of this device will be described. FIG.
FIG. 5 is an enlarged side view of a main part showing a state immediately after the vacuum valve 8 is turned on. That is, the input latch 9 is disengaged from the roller 35 (FIG. 2) of the cam 34 in response to the input command, and the energy storage spring 4 has been released. From the state shown in FIG. 10, the energy storage shaft 3 rotates counterclockwise with the key 38 by about half a turn, but the gear 2 does not move because the key 38 and the movable lever 26 are disengaged from each other. Movable lever at 26
Remains in the position of FIG.

FIG. 13 is an enlarged side view of a main part showing a state in which the energy storage spring 4 is being charged from the state of FIG. The electric motor is driven by the energy storage command from the state of FIG. 12, and the gear 2 starts rotating counterclockwise together with the movable lever 26. Due to the rotation, the second arm 28 of the movable lever 26 is separated from the stopper 23, so that the movable lever 26 rotates counterclockwise around the fixed pin 25 by the force of the urging spring 24. FIG. 13 shows a state in which the gear 2 has rotated about half a circle from the state of FIG. 12, but when it reaches this position, the tip of the first arm 27 of the movable lever 26 has been moved to the inner diameter side of the through hole 16. It comes into contact with the right side of the key 38.

FIG. 14 is an enlarged side view showing a state where the state of FIG. 13 is further advanced and the energy storage spring 4 reaches a dead point. The movable lever 26 is rotated by the rotation of the gear 2.
While the first arm 27 presses the key 38 counterclockwise,
It has been further rotated about half a turn from the state of FIG. From the state shown in FIGS. 13 to 14, the movable lever 26 is
Urged in the counterclockwise direction by the force of
Will not come off. In the state of FIG. 14, when the energy storage spring exceeds the dead point, the second arm 28 of the movable lever 26 rides on the convex portion 23A of the stopper 23.
The movable lever 26 rotates clockwise about the fixed pin 25. Therefore, the engagement between the tip of the first arm 27 of the movable lever 26 and the key 37 is released, and the engagement of the engagement mechanism 36 is released. FIG. 10 shows this state, and the energy storage of the energy storage spring 4 is completed.

Thereafter, the energy storage and release of the energy storage spring 4 is repeated in the same manner. In FIG. 10, if the electric system fails and the motor does not stop, the energy storage spring 4 is not used.
Is completed and the energy storage shaft 3 is stopped, but only the electric motor 1 remains rotating. That is, when the movable lever 26 is in the position shown in FIG.
To get on 3A, the movable lever 26 is rotated clockwise. Therefore, the tip of the first arm 27 is moved to the outer diameter side of the through hole 16 and separated from the key 38, and does not hit this. Therefore, since the engagement mechanism 36 is disengaged, no binding force acts on the electric motor 1 and the electric motor 1 is not overloaded.

The embodiments shown in FIGS. 1, 8 and 9 are all cases where the energy storage spring 4 is for closing, but can also be applied to the energy storage spring for shutoff as in the conventional example. it can.

[0031]

As described above, according to the present invention, since the engagement mechanism is constituted by the key and the movable pin, even if the electric system should fail, the rotation of the motor is not restricted, and the motor can be used. It is no longer broken. Therefore, it is not necessary to frequently stop the operation of the circuit breaker to check the electric system, and it is easy to make an operation plan of the circuit.

Further, in such a configuration, the guide surface of the guide plate is formed so as to surround the energy storage shaft in a hook shape. Thereby, the engagement mechanism is securely engaged, and reliability is greatly improved. Further, since the engagement mechanism is constituted by the key and the movable lever, even if the electric system should fail, the rotation of the motor is not restricted and the motor is not broken. Therefore, it is not necessary to frequently stop the operation of the circuit breaker to check the electric system, and it is easy to make an operation plan of the circuit.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a circuit breaker driving device according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is an enlarged side view of a main part of FIG. 2;

FIG. 4 is a view taken in the direction of arrow B in FIG. 3;

FIG. 5 is an enlarged side view of a main part showing a state immediately after the vacuum valve of FIG. 1 is turned on.

FIG. 6 is an enlarged side view of a main part showing a state where the energy storage spring is being energized from the state of FIG. 5;

FIG. 7 is an enlarged side view of a main part showing a state when the state of FIG. 6 further advances and the energy storage spring reaches a dead point.

FIG. 8 is an enlarged side view of a main part showing a configuration of a circuit breaker driving device according to another embodiment of the present invention.

FIG. 9 is a view taken in the direction of arrow C in FIG. 8;

FIG. 10 is an enlarged side view of a main part showing a configuration of a circuit breaker driving device according to still another embodiment of the present invention.

FIG. 11 is a view taken in the direction of arrow D in FIG. 10;

FIG. 12 is an enlarged side view of a main part showing a state immediately after a vacuum valve is turned on.

FIG. 13 is an enlarged side view of a main part showing a state in which the energy storage spring is being charged from the state of FIG. 12;

FIG. 14 is an enlarged side view of a main part showing a state when the state of FIG. 13 further advances and the energy storage spring reaches a dead point.

FIG. 15 is a side view showing a configuration of a conventional circuit breaker driving device.

FIG. 16 is a view taken in the direction of arrow E in FIG. 15;

FIG. 17 is a side view showing a state immediately after the device of FIG. 15 is put in;

FIG. 18 is a side view showing a state in which the energy storage operation of the energy storage spring is completed in the closed state of the device in FIG. 15;

[Explanation of symbols]

1: electric motor, 1A: rotary shaft, 2: gear, 3: energy storage shaft,
4: energy storage spring, 5: support plate, 5A: crushing line, 5B: hole,
6: open / close shaft, 7, 31, 36: engagement mechanism, 8: vacuum valve, 8A, 8B: conductor, 9: latch for input, 9A: fixed shaft, 10, 22: guide plate, 10A, 22A: guide surface , 11: small gear, 13, 37, 38: key, 14: fixed frame, 15: rivet, 16: through hole, 16A:
Inner wall of through hole, 17, 24: biasing spring, 18: movable pin, 19, 25: fixed pin, 20: support hole, 21: gear projection, 23: stopper, 23A: convex, 26: movable lever, 27: first arm, 28: second arm, 29: window, 30:
Guide pin, 32: crank lever, 33: shaft protrusion,
34: cam, 35: roller, 40, 51, 54: pin,
41: lower frame, 42: crankshaft, 52: input roller, 53: input lever, 55, 55A, 55B: open / close lever, 57: metal fitting, 71: support plate, 81, 82: main circuit conductor, 83: insulation Rod, 84: Operation rod, 86: Flexible conductor

Claims (3)

[Claims] An energy storage spring for opening and closing a circuit breaker, an energy storage shaft for storing the energy storage spring, a gear connected to the energy storage shaft via an engagement mechanism, and rotating the gear. A circuit breaker for engaging the gear and the energy storage shaft when the energy storage spring is energized, and disengaging the gear and the energy storage shaft when the energy storage spring is released. In the driving device of (1), a through hole is formed at the center of the gear, and two support plates are fixed to both side surfaces of the gear so as to close the through hole, and the two support plates are provided at the center of the through hole. A long and narrow support hole is drilled in the radial direction of the through-hole while the energy storage shaft is passed, and arcuate guide plates surrounding the energy storage axis with a guide surface are arranged on both sides of the support plate, and the engagement mechanism is Each of them is composed of a key and a movable pin arranged in the through hole, and this key is protrudingly provided on the outer periphery of the energy storage shaft. The pin is attached while being urged in the outer diameter direction of the through hole by the urging spring, and is inserted into the support hole and protrudes to the outside of the through hole, and the guide surface contacts the movable pin when the accumulation of the energy of the energy accumulating shaft is completed. A circuit breaker characterized by being formed such that a separation distance between the guide surface and the energy storage shaft is reduced with the rotation of the gear when the energy storage operation is performed after the energy storage shaft is released. Drive. 2. The circuit breaker driving device according to claim 1, wherein the guide surface of the guide plate is formed by hooking the energy storage shaft in a hook shape. 3. An energy storage spring for opening and closing the circuit breaker, an energy storage shaft for storing the energy storage spring, a gear connected to the energy storage shaft via an engagement mechanism, and rotating the gear. A circuit breaker for engaging the gear and the energy storage shaft when the energy storage spring is energized, and disengaging the gear and the energy storage shaft when the energy storage spring is released. In the driving device of (1), a through hole is formed at the center of the gear, and two support plates are fixed to both side surfaces of the gear so as to close the through hole, and the two support plates are provided at the center of the through hole. The energy storage shaft is passed and the fixing pin is fixed to the support plate on the outer diameter side of the through hole and passed over, and a stopper having a convex portion is provided outside the through hole,
Each of the engagement mechanisms includes a key and a movable lever disposed in the through hole, and the key is protruded from the outer periphery of the energy storage shaft, and the movable lever has a first arm and a second arm. The first arm is arranged on the rotation direction side of the energy storage shaft, the second arm is arranged on the opposite rotation direction side of the energy accumulation shaft, and the mountain side of the movable lever is on the outer diameter direction side of the through hole. The movable lever is rotatably attached to the fixed pin, and the second arm is constantly urged to the outer radial side of the through hole via the urging spring, thereby opening the window opened in the support plate. One end of the penetrating guide pin is fixed to the second arm, and the other end of the guide pin is arranged so as to be able to abut on the protrusion of the stopper, and is positioned on the protrusion when the energy storage of the energy storage spring ends. A drive device for a circuit breaker, wherein