JPH05342975A - Motor operated device for circuit breaker - Google Patents

Abstract

PURPOSE:To provide a motor operated device for a circuit breaker that can be formed into a small size, and can shorten an operating time. CONSTITUTION:A worm wheel 38 is rotated by a motor 33. An off-operating body 41 is moved in a forward direction by a crank arm 43. A handle 5 is moved from an on position to a reset position by the forward direction movement of the off-operating body 41. When the forward direction movement of the off-operating body 41 is completed, the off-operating body 41 is moved in a backward direction at a high speed by the energizing power of an extension spring 44. According to the backward movement of the off-operating body 41, the handle 5 is moved from the reset position to an off position. An on- operating body 42 is moved in the forward direction by the forward movement of the off-operating body 41 so that a compression coil spring 46 is compressed so as to store repulsion power. The on-operating body 42 is engaged with an engaging mechanism 47. When this engagement is released by a release mechanism 52, the on-operating body 42 is moved in the forward direction by the stored repulsion power of the compression coil spring 46 so as to move the handle 5 to the on position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric operating device for a circuit breaker in which rotation of a motor is converted into reciprocal movement of an operating body to operate a handle of the circuit breaker.

[0002]

2. Description of the Related Art FIG. 8 shows a circuit breaker. In the figure, 1 is a case, 2 is a fixed contact, 3 is a movable arm provided with a movable contact 4, 5 is a handle, 6 is an opening / closing mechanism that connects the movable arm 3 and the handle 5, and 7 is an opening / closing mechanism 6. The latch 8 locks the catch 8 and the trip mechanism 9 unlocks the latch 7.

As is well known, the circuit breaker has movable contacts 4
When an overcurrent flows in the main circuit in the ON state in which the stationary contactor 2 is in contact with the stationary contactor 2, the trip device 9 operates and unlocks the catch 5 by the latch 7. Then, the action of the toggle spring 10 causes the movable arm 3 to rotate in the direction of arrow A, whereby the movable contactor 4 is separated from the fixed contactor 2 to be in the off state, and the handle 5 moves to the trip position. ..

To return from the trip state to the on state, the handle 5 is once operated from the trip position to the reset position and then from the reset position to the on position.
Then, by operating to the reset position, catch 8 again.
Is latched by the latch 7, the subsequent operation to the ON position causes the movable arm 3 to rotate in the direction opposite to the arrow A, whereby the movable contactor 4 comes into contact with the fixed contactor 2. Return to the on state.

As is well known, in the circuit breaker, the handle 5 can be operated to switch between the on state and the off state. That is, the handle 5
When is moved from the on position to the off position, the movable arm 3 is pulled up in the direction of arrow A, and the movable contact 4 is separated from the fixed contact. Further, when the handle 5 is moved from the off position to the on position, the movable arm 3 is pushed down in the direction opposite to the arrow A, and the movable contact 4 comes into contact with the fixed contact 2.

An example of an electric operating device for such a circuit breaker is disclosed in Japanese Utility Model Laid-Open No. Sho 64-2332. To explain this with reference to FIGS. 9 to 12,
First, in FIG. 9, the frame 11 has a guide bar 12
Is attached, and a slider 13 is supported on the guide bar 12 so as to be capable of reciprocating. This slider 13 directly operates the handle 5 of the circuit breaker, and the handle 5 is inserted between a pair of pins 14 fixed to the slider 13. Further, the guide bar 12 is wound with a compression coil spring 15 that is compressed by the movement of the slider 13 when the handle 5 is operated from the on position to the off position and stores elastic force.

On the other hand, the drive source of the electric operating device is the motor 16 shown in FIG. 12, and the rotation of the motor 16 is reduced by the reduction gear mechanism 17 and transmitted to the main shaft 19 via the one-way clutch 18. Has been done. A ratchet wheel 20 is attached to the main shaft 19, and a cam 21 for moving the slider 13 in the forward direction is fixed to one side surface of the ratchet wheel 20.

FIG. 9 shows the electric operating device when the circuit breaker is in the ON state. To switch the circuit breaker to the OFF state, the motor 16 is started and the main shaft 19 and thus the ratchet wheel 20 are turned on. Rotate in the direction of arrow B. Then, as the ratchet wheel 20 rotates, the cam 21 comes into contact with the roller 22 provided on one side surface of the slider 13 as shown in FIG.
The slider 13 is moved in the direction of arrow C via 2.

When the slider 13 moves in the direction of arrow C, the compression coil spring 15 is compressed to store the elastic force. Then, when the handle 5 is moved to the off position by the slider 13, the slider 13 is latched by the latch mechanism 23 shown in FIG. The urging force prevents movement in the backward direction toward the original position.

When the cam 21 is separated from the roller 22, the pin 24 protruding from the cam 21 moves the lever 25 supported by the slider 13 by the rotation of the ratchet wheel 20 thereafter. Hook it and rotate it in the direction of arrow D. Then, the lever 25 operates the switch 26, and the operation of the switch 26 stops the motor 16. As described above, the handle 5 is held in the off position and the circuit breaker is turned off.

To switch from the off state to the on state, the latch of the latch mechanism 23 is released. Then, the slider 13 is moved to the arrow C by the elastic force of the compression coil spring 15.
In the opposite direction, the handle 5 is moved from the off position to the on position, so that the circuit breaker returns to the on state.

[0012]

By the way, in order to move the slider 13 by a stroke necessary for operating the steering wheel, the cam 21 and thus the ratchet wheel 20 are moved.
As a result, a relatively large diameter is required.

However, in the conventional electric operating device having the above-described structure, the ratchet wheel 20 having a large diameter is arranged such that the radial direction is the direction orthogonal to the mounting surface of the frame 11 of the case 1 (vertical direction in FIG. 9). Therefore, the electric operating device becomes large in the thickness direction. Therefore, the amount of protrusion of the electric operating device from the case 1 of the circuit breaker becomes large, and the overall thickness of the circuit breaker with the electric operating device becomes large.

On the other hand, when the circuit breaker is installed in the switchboard, the size of the switchboard is determined in consideration of its size. As described above, the conventional circuit breaker with an electric operating device has a thickness dimension. Since it is large, the switchboard must be made larger accordingly. Also, when trying to attach the electric operating device to the circuit breaker arranged in the existing switchboard, there is no space in the switchboard,
This causes a problem that the attachment of the electric operating device has to be given up.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electric operating device for a circuit breaker which can be miniaturized in the thickness direction and which can reduce the operating time.

[0016]

In order to achieve the above object, an electric operating device for a circuit breaker according to the present invention is provided with a motor, a worm rotated by the motor, and a tooth portion meshing with the worm. A worm wheel that has a predetermined angle range and that is driven to rotate by a worm by the tooth formation angle, and is connected to this worm wheel via a crank arm to move in the forward direction by the rotation of the worm wheel driven by the worm. Then, an off operation body for moving the handle of the circuit breaker from the on position to the off position is provided, and the off operation body is urged in the backward direction to complete the forward movement of the off operation body to cause the worm to move. When the tooth of the wheel disengages from the worm, rotate the off operation body until the tooth of the worm wheel re-engages with the worm. And a first elastic body that moves in the backward direction is provided, and when the OFF operation body is moved in the forward direction, the OFF operation body pushes the handle to move in the forward direction and in the backward direction, the handle is moved. An on-operation body for moving to the on-position is provided, and elastic force is stored by moving the on-operation body in the forward direction, and the on-operation body is biased in the backward direction by the stored elastic force. Two elastic bodies are provided, and a locking mechanism for locking the ON operation body at the position moved in the forward direction is provided regardless of the movement of the OFF operation body in the backward direction. A release mechanism is provided for releasing the stop and moving the on-operation body in the backward direction by the elastic force of the elastic body.

[0017]

In order to move the handle of the circuit breaker by the required stroke, the worm wheel has a relatively large diameter, but since this worm wheel is arranged parallel to the mounting surface of the circuit breaker, The overall thickness of the operating device is reduced. Further, when the tooth portion of the worm wheel is disengaged from the worm, the off-operation body moves at a high speed in the backward direction due to the urging force of the first elastic body, so that the time for the off-operation body to return to the original position is short. Become.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the circuit breaker shown in FIG. 8 is used, and the reference numerals used in FIG. 8 are used for the components of the circuit breaker, and detailed description thereof is omitted.

First, in FIGS. 1 and 2, an electric operating device 31 according to the present invention is attached to a case 1 of a circuit breaker, and a frame 32 of the electric operating device 31.
The handle 5 of the circuit breaker projects inside. 1 and 2 show the handle 5 in the ON position.

In the frame 32, the electric operating device 3
A motor 33, which is a drive source for the first motor, is arranged. A reduction gear mechanism 34 is connected to the motor 33, and its output shaft 3
A worm 35 is attached to 4a. And
The worm 35 meshes with a worm wheel 38 supported by a support shaft 36 provided upright on the bottom surface of the frame 32 via a bearing 37. The worm wheel 38 is configured as a so-called sector gear, and the worm 35
A tooth portion 38a that meshes with is formed over a predetermined angle range, and the remaining angle range is a toothless portion 38b. Therefore, the worm wheel 38 is rotated by the worm 35 by the angle at which the tooth portion 38a is formed. The motor 33 is controlled by a control device (not shown).

In the frame 32, two guide bars 40, 40, both ends of which are supported by supports 39, are provided.
Are arranged in parallel. An OFF operation body 41 and an ON operation body 42 are slidably supported on the guide bars 40, 40, respectively.
A handle 5 of the circuit breaker is located between the two.

The worm wheel 38 and the off operation body 41 are connected by a crank arm 43, so that the rotary motion of the worm wheel 38 is converted into the linear motion of the off operation body 41. Further, a tension coil spring 44 as a first elastic body is stretched between the off operation body 41 and the frame 32, and the off operation body 41 is indicated by the arrow E by the tension coil spring 44.
It is urged in the reverse direction opposite to. When the worm wheel 38 is rotationally driven in the clockwise direction by the worm 35 from the position shown in FIG. 1 (the position where the start end of the tooth portion 38a meshes with the worm 35), the turning-off operation body 41 is indicated by arrow E. Move in the forward direction indicated by. Due to this forward movement, the off operation body 41 moves the handle 5 from the on position to the trip position, and at the same time, the on operation body 42.
To move in the forward direction. Then, when the forward movement is completed, the tooth portion 38a of the worm wheel 38 is configured to be disengaged from the worm 35, and then the OFF operation body 41 is pulled by the tension coil spring 44.
Due to the urging force of the worm wheel 38, the worm wheel 38 is rotated in the reverse direction opposite to the arrow E along with the idle rotation.

A pair of spring seats 45, 45 are rotatably provided on the on-operation body 42 and the inner surface of the frame 32, and a second elastic seat is provided between the spring seats 45, 45. A compression coil spring 46 as a body is provided. When the on-operation body 42 is pushed by the off-operation body 41 and moves in the forward direction indicated by the arrow E, the compression coil spring 46
Is compressed and stores elastic force.
The elastic force of the compression coil spring 46 is set to be smaller than the elastic force of the toggle spring 10 of the circuit breaker.

The on-operation body 42 moved in the forward direction is
It is adapted to be locked by a locking mechanism 47. The locking mechanism 47 is provided on the support member 4 provided on the frame 32.
8 includes a lock lever 50 rotatably supported by a pin 49, and a compression coil spring 51 that biases the lock lever 50 in the direction of arrow F. A step portion 50a is formed on the upper surface portion of the locking lever 50, and an upper surface of the right side portion of the step portion 50a in the drawing is an inclined surface 50b. Then, the on-operation body 42 slides on the inclined surface 50b of the locking lever 50, moves the locking lever 50 in the direction opposite to the arrow F, and moves in the direction of the arrow E to move the step portion 50.
When passing a, the locking lever 50 moves to the compression coil spring 51.
To rotate in the direction of arrow F. As a result, when the on-operation body 42 subsequently attempts to move in the backward direction by the repulsive force of the compression coil spring 46, the on-operation body 42 is turned on.
Is locked to the stepped portion 50a of the locking lever 50 and stopped at the position moved in the arrow E direction.

The unlocking mechanism 52 unlocks the locking lever 50. The release mechanism 52 uses an electromagnet 53 controlled by a control device (not shown) as a drive source, and a movable iron core 53a thereof has a release lever 56 supported by a support member 54 provided on the frame 32 via a pin 55. Is linked to. Therefore, when the electromagnet 53 is energized and its movable iron core 53a moves upward as indicated by arrow G, the release lever 56 rotates in the direction of arrow H and presses the arm 50c extended from the locking lever 50 to lock it. The lever 50 is rotated in the direction opposite to the arrow F. Then, the step portion 50a of the locking lever 50 is disengaged from the on-operation body 42, so that the locking on the on-operation body 42 is released.

Figure! In FIG. 5, reference numeral 57 denotes a switch for detecting that the off operation body 41 makes one reciprocation and returns to the original position. When the worm wheel 38 makes one rotation (the off operation body 41 makes one reciprocation), the switch 57 is provided on the worm wheel 38. The pin 38c thus pushed presses the actuator 57a of the switch 57. Then, the switch 57 issues a signal, and a control device (not shown) is configured to turn off the motor 33 based on the signal.

Reference numeral 58 denotes a switch for detecting that the ON operation body 42 has been moved in the forward direction, and the ON operation body 42 has been moved in the forward direction indicated by the arrow E to lock the lock lever 5.
When it reaches the position where it is locked at 0, the on-operation body 42 presses the actuator 58a of the switch 58. Then, the switch 58 outputs a detection signal, and the control device (not shown) is configured to energize the electromagnet 53 when an ON operation signal is input from the outside when the detection signal is output from the switch 58.

Next, the operation of the above configuration will be described.

Now, assuming that the electric operating device 31 is in the state shown in FIG. 1 and the circuit breaker is in the ON state, the case of switching from this ON state to the OFF state will be described.

First, when an OFF operation signal is input from the outside in order to switch from the ON state to the OFF state, a control device (not shown) energizes the motor 33 to activate it. The rotation of the motor 33 is performed by the reduction gear mechanism 34 and the worm 35.
To the worm wheel 38, and the worm wheel 38 rotates in the clockwise direction. With the rotation of the worm wheel 38, the crank arm 43 acts to push the off operation body 41, so that the off operation body 41 moves in the forward direction indicated by the arrow E as shown in FIG. By this outward movement, the OFF operation body 41 moves the handle 5 toward the trip position and the ON operation body 42 in the same direction. Then, the ON operation body 42 is moved in the forward direction to move the compression coil spring 4
Press 6 to reduce the elastic force.

When the handle 5 passes through the off position and is moved to the trip position, the on-operation body 42 enters a state where it passes through the stepped portion 50a of the locking lever 50 and presses the actuator 58a of the switch 58. To do. At this time,
The off operation body 41 is in a state in which the outward movement is completed,
After that, as shown in FIG. 4, the tooth portion 38 a of the worm wheel 38 is disengaged from the worm 35 when the OFF operation body 41 moves slightly in the backward direction opposite to the arrow E. Therefore, the worm wheel 38 moves at high speed in the backward direction opposite to the arrow E while rotating the worm wheel 38 in the clockwise direction by the urging force of the tension coil spring 44, and returns to near the original position. Then, the off operation body 4
The handle 5 moves from the trip position to the off position by the action of the toggle spring 10 so as to follow the backward movement of 1. At this time, the on-operation body 42 also tries to move in the backward direction by the stored elastic force of the compression coil spring 46, but this backward movement of the on-operation body 42 is immediately locked as shown in FIG. It is stopped by lever 50. Therefore, even if the off operation body 41 moves in the backward direction, the on operation body 42 does not move in the backward direction, so that the handle 5 stays at the off position, and the circuit breaker is changed from the on state to the off state. It has been switched.

On the other hand, when the OFF operation body 41 moves in the backward direction at a high speed by the urging force of the tension coil spring 44 as described above and returns to the original position, the worm wheel 3
The tooth portion 38a of No. 8 comes to re-engage with the worm 35, and then the worm wheel 38 again moves to the worm 35.
Is driven to rotate. By re-driving the worm wheel 38 by the worm 35, the OFF operation body 41 is further moved in the backward direction and returned to the original position, as shown in FIG. In synchronization with this, the pin 38c of the worm wheel 38 presses the actuator 57a of the switch 57. Then, the switch 57 operates to emit a signal,
Based on this signal, a control device (not shown) turns off the motor 33.

Next, when an OFF operation signal is input from the outside in order to switch the circuit breaker from the OFF state to the ON state, a control device (not shown) energizes the electromagnet 53. Then, the movable iron core 53a moves in the arrow G direction, and in conjunction with this, the release lever 56 rotates in the arrow H direction to rotate the locking lever 50 in the direction opposite to the arrow F. As shown, the stepped portion 50a of the locking lever 50 is turned on by the operating body 4
2, the locking of the ON operation body 42 is released. This unlocking moves the on-operation body 42 in the backward direction to the position (the position shown in FIG. 1) in which the on-operation body 42 contacts the off-operation body 41 by the elastic force of the compression coil spring 46. As a result, the handle 5 is pressed by the on-operation body 42 and moves from the off position to the on position, whereby the circuit breaker is turned on.

When an overcurrent flows in the main circuit while the circuit breaker is in the ON state, the tripping device 9 shown in FIG. 8 operates to release the catch 8 from the latch 7 and thus the toggle spring. By the action of 10, the movable arm 3 rotates in the direction of arrow A, whereby the contactor 2 is separated from the fixed contactor 3 and turned off, and the handle 5 moves to the trip position. At this time, since the elastic force of the toggle spring 10 is larger than the elastic force of the compression coil spring 46 that biases the on-operation body 42 in the backward direction, the handle 5 moves the on-operation body 42 in the arrow E direction. It moves to the trip position while moving to.

To return from the trip state to the on state, the motor 33 is energized, the handle 5 is moved to the reset position by the off operation body 41 in the same manner as described above, and then the electromagnet 53 is energized. In the same manner as described above, the on-operation body 42 is moved in the backward direction. As a result, the circuit breaker returns to the ON state.

As described above, according to this embodiment, the motor 33
Since a crank mechanism composed of the worm wheel 38 and the crank arm 43 is used as a mechanism for converting the rotational motion of the above into the linear motion of the off operation body 41, the worm wheel 38 serves as the frame 32 mounting surface of the case 1 of the circuit breaker. Can be arranged in parallel. Therefore, even if the diameter of the worm wheel 38 becomes relatively large in order to move the handle 5 by a necessary stroke, the electric operating device 31 can be made thin as a whole.
Therefore, when configured as a circuit breaker with an electric operating device, it is possible to reduce the overall thickness dimension, so that it is possible to avoid an increase in the size of the switchboard and to use an electric operating device in the circuit breaker arranged in the existing switchboard. It is also possible to attach.

Further, the worm wheel 38 is configured as a so-called sector gear so that the tooth portion 38a of the worm wheel 38 is disengaged from the worm 35 at the time when the OFF operation body 41 is moved in the forward direction. Since the tension coil spring 44 that biases the operation body 41 in the backward direction is provided, the off operation body 41 can be quickly returned to the original position after the movement in the forward direction is completed. Therefore, the operation for moving the handle 5 to the off position and then the on position, for example, the operation for returning the circuit breaker in the trip state to the on state can be performed in a short time.

In the above embodiment, the off operation body 41.
A tension coil spring 44 for urging the worm in the backward direction is provided between the worm wheel 38 and the frame 32, and when the OFF operation body 41 completes the forward movement, the worm wheel 38 is rotated in the clockwise direction. The off operation body 41 may be biased in the backward direction by being biased.

[0039]

As described above, according to the present invention, since the crank mechanism including the worm wheel and the crank arm is used as the mechanism for converting the rotation of the motor into the linear motion of the operating body, the overall structure is thin. You can
Further, when the tooth portion of the worm wheel is disengaged from the worm at the end of the forward movement of the off operation body, the off operation body is configured to be moved in the backward direction by the elastic body. It has an excellent effect that it can be performed in a short time.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing an embodiment of the present invention with a handle of a circuit breaker set to an ON position.

FIG. 2 is a vertical sectional side view showing the same state.

FIG. 3 is a diagram corresponding to FIG. 1 showing a state where the handle is being moved to an off position.

FIG. 4 is a view corresponding to FIG. 1 in a state immediately before the tooth portion of the worm wheel comes off the worm.

FIG. 5 is a view corresponding to FIG. 2 in the same state.

FIG. 6 is a view corresponding to FIG. 1 showing a state in which a handle is set to an off position

FIG. 7 is a view corresponding to FIG. 2 showing a state where the ON operation body is unlocked in the same state.

FIG. 8 is a vertical sectional side view of the circuit breaker.

FIG. 9 is a vertical sectional side view showing a conventional electric operating device with a handle of a circuit breaker set to an on position.

FIG. 10 is a view corresponding to FIG. 8 showing a state where the handle is being moved to the off position.

FIG. 11 is a view corresponding to FIG. 8 showing a state where the handle is moved to the off position.

FIG. 12 is a plan view showing a state in which a handle is moved to an off position.

[Explanation of symbols]

1 is a case of a circuit breaker, 5 is a handle, 32 is a frame of an electric operating device, 33 is a motor, 34 is a reduction gear mechanism, 35 is a worm, 38 is a worm wheel, 38a
Is a tooth portion, 40 is a guide bar, 41 is an operation body for turning off, 42
Is an operating body for turning on, 43 is a crank arm, 44 is a tension coil spring (first elastic body), 46 is a compression coil spring (second elastic body), 47 is a locking mechanism, 50 is a locking lever, 52 Is a release mechanism, 53 is an electromagnet, and 56 is a release lever.

Claims (1)

[Claims] 1. A worm wheel, which is provided with a motor, a worm rotated by the motor, a tooth portion meshing with the worm over a predetermined angle range, and is rotatably driven by the worm by the forming angle of the tooth portion, and the worm wheel. An off operation body connected to a wheel through a crank arm to move in the forward direction by the rotation of the worm wheel driven by the worm to move the handle of the circuit breaker from the on position to the off position, and the off operation body And the tooth portion of the worm wheel is disengaged from the worm at the end of the forward movement of the OFF operating body, and the OFF operating body is rotated until the tooth portion of the worm wheel is re-engaged with the worm. The first to move in the backward direction while moving
Of the elastic body and the OFF operation body are pushed by the OFF operation body when the OFF operation body moves in the forward direction, move in the forward direction, and move in the backward direction, the ON operation body moves the handle to the ON position. And a second elastic body that stores an elastic force by moving the ON operation body in the forward direction and urges the ON operation body in the backward direction by the stored elastic force, and the OFF operation. A locking mechanism that locks the on-operation body at the position moved in the forward direction regardless of the movement of the body in the backward direction, and the locking by the locking mechanism to release the on-operation body An electric operating device for a circuit breaker, comprising: a release mechanism for moving the elastic body in the backward direction by the repulsive force.