JP4481176B2 - Electric circuit breaker operation device - Google Patents

Description

  The present invention relates to an electric operating device for a circuit breaker, and more particularly to an electric operating device that opens and closes a circuit breaker by storing and releasing a closing spring.

  As a conventional electric operation device for a circuit breaker, for example, a device as disclosed in Patent Document 1 shown in FIGS. 4 and 5 is known. Referring to FIG. 4 showing a circuit breaker in an OFF state, 1 is a circuit breaker, 2 is a rotatable handle for operating an opening / closing mechanism for contacting and opening the opening / closing contact of circuit breaker 1, 3 is an electric operating device, 4 and 5 are bases and covers of the electric operating device 3, 6 is a mounting plate for detachably attaching the electric operating device 3 to the surface of the circuit breaker 1, 7 is an electric motor, and 8 is an electric motor 7 A worm provided on the rotating shaft of the worm, 9 is a worm wheel that is combined with the worm 8 to form a worm gear, 10 is a gear that rotates with the worm wheel 9, 11 is a gear that meshes with the gear 10, and 12 is a gear that rotates with the gear 11. , 13 is a shaft that coaxially supports the gear 11 and the gear 12, 14 is a gear that meshes with the gear 12, 15 is a gear that meshes with the gear 14, 16 is a cam, 17 is a gear 14 and the cam 16 An integrally supporting shaft, 18 is a pin provided on the cam 16 at a position away from its rotational axis, 19 is a fixing member, 20 is a coil-shaped insertion provided between the pin 18 and the fixing member 19 A spring, 21 is a roller provided on the gear 14 at a position off its rotational axis, 22 is an operation plate that slides up and down while rotating the handle 2, and 23 and 24 are both provided on the operation plate 22 and provided on the gear. An ON operation block and an OFF operation block 25 and 26 are provided on the operation plate 22 to contact the roller 21 and slide the operation plate 22 upward and downward, respectively. A handle catch into which the handle 2 of the circuit breaker 1 is fitted, 27 is a support shaft of the gear 15 that rotates together with the gear 15, and 28 is detachably attached to a hole formed in the support shaft 27. A manual energy-storing handle. Reference numeral 29 denotes a printed wiring board including an electronic circuit for controlling the electric operating device 3.

  Referring to FIG. 5, 39 is an upper substrate attached to the upper portion of the base 4, 40 and 41 are first and second latch levers 42 and 43, which are rotatably provided on the upper substrate 39, respectively. Each of the springs 44 biases the first latch lever 40 and the second latch lever 41 in the clockwise direction, and 44 is an electromagnet. FIG. 5 shows the state where the closing spring 20 is tensioned and the circuit breaker is OFF, and the line connecting the pin 18 that supports both ends of the closing spring 20 and the fixing member 19 is the rotation center of the cam 16. The cam 16 is urged counterclockwise by the urging force of the closing spring 20 slightly on the left side, and the engagement side 16a and the engagement end 41a of the second latch lever 41 are engaged with each other. The latch lever 41 is biased counterclockwise against the spring 43, and the pin 45 provided at the other end of the second latch lever 41 engages with the engagement side 40a of the first latch lever 40 to engage the first. The latch lever 40 is urged clockwise. The first latch lever 40 of such a latch mechanism is prevented from rotating clockwise by a stopper (not shown). Further, a hexagon hole 27a for inserting a manual energy storage handle 28 is formed at the tip of the support shaft 27.

  The ON operation of the conventional electric operating device 3 having such a structure will be described with reference to FIGS. As shown in FIG. 5, when the circuit breaker 1 is in the OFF state, the closing spring 20 is in the stored state. When an ON command is issued in this state, the electromagnet 44 is excited and the pin 53 moves in the right direction, and the operation piece 54 attached to the pin 53 rotates the first latch lever 40 in the counterclockwise direction. As a result, the engagement between the engagement piece 40a of the first latch lever 40 and the pin 45 is released, the second latch lever 41 rotates counterclockwise, and the engagement end 41a and the engagement side 16a of the cam 16 Is released, the cam 16 rotates counterclockwise at a high speed, and the full length of the closing spring 20 becomes the shortest. In the releasing operation of the closing spring 20, the gear 11 meshing with the worm gear is not rotationally biased by the action of the one-way bearing 47, so that the rotation of the cam 16 is not hindered. Then, the cam 16 rotates at high speed in the counterclockwise direction, whereby the gear 14 rotates at high speed in the counterclockwise direction via the shaft 17, and the roller 21 pushes the ON operation block 23 to move the operation plate 22 upward at high speed. By moving, the handle 2 moves upward while rotating, and the circuit breaker is turned on. After being turned on, the operation plate 22 is restrained by the position of the handle 2 of the circuit breaker 1, and the pin 18 is at the position (18). Even at this position, the closing spring 20 is biased in the contracting direction, but reverse rotation is prevented by the ON holding force by the spring in the switching mechanism of the circuit breaker.

Next, an operation for turning off the ON state will be described. This circuit breaker OFF operation is performed in parallel with the storing operation of the closing spring 20. In response to the OFF command, the electric motor 7 rotates, the gear 10 rotates counterclockwise via the worm 8 and the worm wheel 9, and the gear 11 that meshes with the gear 10 rotates clockwise together with the gear 12 via the shaft 13 and the one-way bearing 47. The gear 14 meshing with 12 rotates counterclockwise, the cam 16 rotates counterclockwise, and the closing spring 20 is stored. When the line connecting the pin 18 that supports both ends of the closing spring 20 and the fixing member 19 reaches the rotation center of the cam 16, the closing spring 20 further rotates counterclockwise by its own releasing force, and the engagement piece of the cam 16 16a engages with the engagement end 41a of the second latch lever 41 to be in the state shown in FIG. During the accumulating operation described above, the gear 21 rotates counterclockwise, so that the roller 21 pushes the OFF operation block 24 and moves the operation plate 22 downward. It will be in the OFF state.
Japanese Patent Laid-Open No. 2004-152689

  The closing spring of the conventional electric circuit breaker operating circuit as described above has a large acting force to overcome the spring included in the circuit breaker switching mechanism. Therefore, in the ON operation, since the closing spring is released at a high speed, the pin 18 does not stop at the position (18) but reaches the position ((18)) due to malfunction due to excessive rotation of the cam. There was a problem that the circuit breaker that was turned on was turned off again.

  Accordingly, an object of the present invention is to provide an electric operation device for a circuit breaker that can suppress an excessive rotation of the cam when the closing spring is released and can be reliably turned on.

  In order to solve the above problem, the present invention rotates a closing spring and a rotating plate that are mounted on a rotating plate whose one end is mounted on a fixed member and the other end rotates in one direction, and whose rotational axis is off. An electric motor for accumulating the closing spring, a gear device interposed between the electric motor and the rotating plate, and a latch mechanism for preventing rotation of the rotating plate in the releasing direction at the position where the closing spring is stored A slide plate for holding the opening / closing operation handle of the circuit breaker and a cam mechanism for converting the rotation of the rotary plate to linearly move the slide plate. The above-mentioned closing spring is a coil spring having a gap between each line in a no-load state, and is released as a tension spring or a compression spring from the stored state before the ON operation to the end of the ON operation. At the end of the ON operation, the energy is stored by inertia as a compression spring or a tension spring, respectively.

  In the present invention, when the closing spring is released by the ON operation, the rotation of the rotating plate is braked at the end of the ON operation, so that the excessive rotation is suppressed and the malfunction is turned OFF. Can be prevented. Therefore, it is possible to provide an electric operation device for a circuit breaker that can be reliably turned on with a simple configuration.

  Embodiments of the present invention will be described with reference to the examples shown in FIGS. The electric operating device of this embodiment is essentially the same as the device shown in FIGS. 4 and 5 except for the closing spring, and substantially the same members will be described using the same reference numerals.

  Whereas the closing spring 20 of the conventional electric operating device acts as a tension coil spring in which the lines are in close contact with each other when no load is applied, the closing spring 55 of the present embodiment is between each line in the state when there is no load. There is a gap, and it can be used for both a tension coil spring and a compression coil spring.

  The ON operation of the electric operating device 3 of the present invention having such a structure will be described with reference to FIGS. As shown in FIG. 1, when the circuit breaker 1 is in an OFF state, the closing spring 55 is in a state of being stored in a tensioned state. When an ON command is issued in this state, an electromagnet device (not shown) is excited to rotate the first latch lever 40 counterclockwise. As a result, the engagement between the engagement side 40a of the first latch lever 40 and the pin 45 is released, the second latch lever 41 rotates counterclockwise, and the engagement end 41a and the engagement side 16a of the cam 16 Is released, the cam 16 rotates counterclockwise, and the closing spring 55 contracts. After the closing spring 55 reaches the free length shown in FIG. 2, it acts as a compression coil spring, braking is applied to the rotation of the cam 16, and the entire length of the closing spring 55 is shortened and stored in a compressed state. The state shown in FIG. When the cam 16 rotates counterclockwise, the roller 21 pushes the ON operation block 23 and moves the operation plate 22 upward to move the handle 2 to the ON position, and the circuit breaker is in the ON state. It becomes. In addition, in the state of FIG. 3, it has stopped by the ON holding force of the handle 2. Accordingly, it is possible to prevent a malfunction in which the circuit breaker once turned on is turned off again because the cam 16 rotates too much during the ON operation.

  Next, an operation for turning off the ON state will be described. In FIG. 3, when the motor is rotated by the OFF command and the cam 16 is rotated counterclockwise, the closing spring 55 is expanded to accumulate energy. When the line connecting the pin 18 that supports both ends of the closing spring 55 and the fixing member 19 reaches the rotation center of the cam 16, the closing spring 55 further rotates counterclockwise by its own releasing force, and the engagement side of the cam 16 16a engages with the engagement end 41a of the second latch lever 41 to be in the state shown in FIG. When the cam 16 rotates counterclockwise, the roller 21 pushes the OFF operation block 24 and moves the operation plate 22 downward, so that the handle 2 moves to the OFF position, and the circuit breaker is turned OFF.

  In this embodiment, the closing spring is released as a tension spring from the stored state before the ON operation to the end of the ON operation, and stored as a compression spring by inertia at the end of the ON operation. However, the fixing member 19 is arranged in the opposite direction to that of the embodiment, and is released as a compression spring from the stored state before the ON operation to the end of the ON operation, and at the end of the ON operation. The tension spring may be configured to store energy by inertia.

It is a front view explaining the principal part inside when the Example of the electrically-driven operating device by this invention is mounted | worn with a circuit breaker. It is a front view which shows a state when a closing spring reaches free length in the release process. FIG. 2 is a view corresponding to FIG. 1 in an ON state. It is a side view which shows the principal part inside the electric operating device of the conventional circuit breaker. It is a front view which shows the principal part inside the electric operating device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Handle 3 Electric operating device 4 Base 5 Cover 6 Mounting plate 7 Electric motor 8 Worm 9 Worm wheel 10, 11, 12, 14, 15 Gear 13, 17 Shaft 16 Cam 16a Engagement side 18 Pin 19 Fixing member 21 Roller 22 Operation plate 23 ON operation block 24 OFF operation blocks 25 and 26 Handle catch 27 Support shaft 27a Hexagonal hole 28 Manual accumulation handle 29 Printed wiring board 39 Upper substrate 40 First latch lever 40a Engagement side 41 Second latch lever 41a Engagement end 42, 43 Spring 44 Electromagnet 45 Pin 47 One-way bearing 53 Pin 54 Operation piece 55 Input spring

Claims (1)

In the electric operating device that operates the opening / closing operation handle of the circuit breaker,
A closing spring mounted on a rotating plate whose one end is attached to a fixed member and the other end rotates in one direction, at a position off its rotational axis,
An electric motor configured to store the closing spring by rotating the rotating plate;
A gear device interposed between the electric motor and the rotating plate;
A latch mechanism for preventing rotation of the rotating plate in a releasing direction at a position where the closing spring is stored;
A slide plate for holding an opening / closing operation handle of the circuit breaker, and a cam mechanism for converting the rotation of the rotary plate to linearly move the slide plate,
The closing spring is a coil spring having a gap between each line in a no-load state, and is released as a tension spring or a compression spring from the accumulated state before the ON operation to the end of the ON operation. An electric operating device for a circuit breaker characterized in that at the end of the operation, it is stored by inertia as a compression spring or a tension spring, respectively.

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