JPH0216528B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an electronic wiring cutter, and in particular,
The present invention relates to a reset mechanism suitable for automatically resetting a tripping mechanism.

[Background of the Invention] Generally, the magnetic tripping device used in the valve wiring and circuit breaker is operated by a weak signal from the overcurrent detector, so it is normally operated by the magnetic flux of the permanent magnet. The movable armature is held in the reset position by overcoming the force of the release spring, and the magnetic flux generated by the biasing of the tripping coil cancels the magnetic flux of the permanent magnet to release the movable armature, which is then released by the force of the spring. This device moves the tripping device to the tripping position and transmits that movement to the tripping member inside the breaker. Unlike the normally used thermal electromagnetic tripping device, the tripping device is in a state where it can operate again. In order to do this, the movable armature must be returned from the tripped position to the reset position by an external force.

Conventionally, as a mechanism for resetting a magnetic trip device, the movable armature of the magnetic trip device is moved to the reset position via an actuator in contact with one end of the handle by resetting the shield breaker operating handle after a tripping operation. There is something like this.
Described in Publication No. 5505. There is also a device that transmits the movement of the breaker contact arm to the open position due to the tripping operation to the movable armature of the magnetic tripping device via an actuator to move it to the reset position. -Described in Publication No. 34424.

However, in the method of resetting with the handle, the magnetic trip device must work not only in the ON state but also in the OFF state, so the magnetic trip device must be activated by converting the slight displacement of the handle between the OFF state and the reset state. Must be reset. Furthermore, since the actuator cannot be released after the reset is completed, the actuator interferes with the operation of the movable armature.

In addition, the method of resetting via the actuator by the movement of the contact arm requires that the support member for the contact opening/closing mechanism of the contact arm, the magnetic tripping device, and the latch mechanism are each attached separately, and are composed of many parts. accuracy,
Strict adjustment work is required. Therefore, when the circuit or disconnector is opened/closed or disconnected, the high-speed mechanical movement and overstroke cause deformation of the component parts, resulting in malfunction. As described above, in either case, reliability is poor because a slight displacement of an excessive force is used.

[Purpose of the invention]

An object of the present invention is to provide an automatic reset mechanism that can reliably perform the reset operation of a magnetic trip device immediately after tripping, and in particular is configured so that the reset mechanism does not interfere with the operation of the tripping mechanism during tripping. An object of the present invention is to obtain a highly reliable wiring disconnector tripping mechanism.

[Summary of the invention]

In order to achieve the above object, the present invention provides a contact opening/closing mechanism as a molded circuit breaker, which includes a hook linked to a handle for opening/closing the switching contacts;
The object is a tripping mechanism including an engaging part that engages with the hook and releases the engagement by tripping, and a tripping circuit that supplies a tripping signal to the tripping mechanism. .

The tripping mechanism is provided with the following means. That is, a magnetic tripping means has a movable element connected to a tripping force transmitting means for transmitting a tripping force to the engaging portion and operates the movable element in a tripping direction in response to the tripping signal; urging means for urging the mover to a reset position of the magnetic tripping means by disengaging the hook from the engaging portion;
An urging release means for releasing the urging of the urging means in the reset direction in response to engagement of the hook interlocked with the handle with the tripping means.

In this way, the magnetic tripping means operates in the direction of tripping the mover in response to the tripping signal from the tripping circuit, and this is transmitted via the tripping force transmission means, and when the engaging portion is released from the hook. The biasing means automatically biases the mover to the reset position of the magnetic tripping means by its biasing force, and resets it.

After the tripping operation, the reset operation of the operation handle of the circuit breaker engages the tripping means with a hook interlocked with the handle, so that the biasing release means releases the biasing of the biasing means in the reset direction. This returns the molded circuit breaker to its normal state.

According to a preferred embodiment of the present invention, in a molded circuit breaker equipped with a magnetic trip device, the reset operation of the magnetic trip device can be reliably performed and the reset mechanism does not interfere with the trip operation. In order to obtain this, the tripping mechanism includes a magnetic tripping device, a tripping force transmitting means connected to the magnetic tripping device and slidably provided, and an actuator driven by the tripping force transmitting means. , a tripping means driven by the actuator, an interlocking means provided on the tripping means so as to be pressed by the locking of the hook to the tripping means, and a loosely fitting member of the tripping force transmitting means. a reset lever provided as a reset lever; a reset lever holding means stretched between the reset lever and the interlocking means;
A reset lever biasing means provided to bias the reset lever in the reset direction, and an engagement portion with the reset lever provided in the tripping force transmitting means, and when the tripping mechanism is on standby. In this case, the reset lever is provided at a position exceeding the stroke of the engaging portion, and when the reset lever is released, the interlocking means is actuated by releasing the lock between the tripping means and the hook, and the reset lever holding means and the reset lever are disengaged. The present invention is characterized in that the reset lever is biased in the reset direction via lever biasing means.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 14.

FIG. 1 shows the entire configuration of a wiring sheath breaker in one embodiment of the present invention. Inside the insulating case 1, there are primary and secondary conductors 12a and 12 near the bottom.
b, the primary side conductor 12a is provided with a fixed contact 22, and the secondary side conductor 12b is provided so as to pass through a current transformer 7 as a current detection means provided for each phase. It consists of A contact opening/closing mechanism 24 having a movable contact 21 is provided between the primary conductor 12a and the secondary conductor 12b, and the movable contact 2
1 is electrically connected to the secondary conductor 12b. The contact opening/closing mechanism 24 includes a handle 2 for external operation and a hook 3 for automatic tripping in the event of an overcurrent. The arc chute 23 is provided around the contact portion.

The current signal detected by the current transformer 7 is supplied to a trip circuit 8 consisting of an electronic circuit, converted into a trip signal, and applied to a magnetic trip device 9 as a magnetic trip means. The tripping mechanism 25 includes a trip fitting 4, a pawl receiver 5, and a pawl 6 that constitute an engaging portion with the hook 3, a pin 10a as a tripping force transmitting means for transmitting a tripping force to the engaging portion, and a pin. A magnetic tripping device 9 as a magnetic tripping means that has a movable armature 10 as a movable element connected to a movable armature 10a and operates the movable armature 10 in a tripping direction in response to a tripping signal from a tripping circuit 8. and a reset lever 13 and a compression spring 1 constituting a biasing means for biasing the movable armature 10 to the reset position of the magnetic tripping device 9 upon disengaging from the engagement portion of the hook 3.
5, and a lever 11 constituting an urging release means for releasing the urging of the urging means in the reset direction in response to the engagement of the hook 3 with the engaging portion linked to the handle 2.
and a tension spring 14, and further includes a trip button 20 for a trip operation test or manual trip. FIGS. 2, 3, and 4 show the positional relationship of each component of the tripping mechanism during normal energization, tripping, and resetting, respectively. The pawl receiver 5 includes a stopper 34 at the lower end 4d of the trip fitting 4, is rotatably provided on the support shaft 31, and is locked by a stopper 6a provided on the pawl 6 during normal energization and reset. . As shown in FIG. 5, the trip fitting 4 includes an engaging portion 4a that engages with the tip 3a of the hook 3, notches 4b and 4c, and a lower end 4d.
It is biased counterclockwise by a torsion spring (not shown) wound around 2. The notch 4b is provided to prevent interference when the tip 3a of the hook 3 is engaged with the engaging portion 4a during normal energization and reset. The cut portion 4c is provided in a substantially U-shape and is loosely inserted into the support shaft 32, and the lower end portion 4d is provided in abutment against the stopper 34 so as to be freely slidable. It is constructed to facilitate the release of the hook 3 and the re-locking of the hook 3 at the time of reset. The pawl 6 is rotatably supported on a support shaft 30, includes a stopper portion 6a that abuts the pawl receiver 5, and a pin 10a of the magnetic tripping device 9, which is provided approximately at right angles to the stopper portion 6a.
an actuator section 6b that transmits the movement of the trip button 20; and another actuator section 6 that is provided in a direction substantially perpendicular to the actuator section 6b and approximately 180 degrees different from the stopper section 6a and that transmits the movement of the trip button 20.
c. The lever 11 is formed in a substantially dogleg shape, has a substantially central portion rotatably supported on a support shaft 32, and has a contact portion 11 at its upper end that engages with the hook 3.
a and a mounting hole 11b for the tension spring 14 at the lower end.
It consists of: In this embodiment, the reset lever 13 is rotatably provided on the support shaft 33, and
4. As shown in Figure A, the attachment hole 13a of the tension spring 14,
It includes a loosely fitting part 13b with the pin 10a and a loosely fitting part 13c with the guide 63. The guide 63 is provided parallel to the pin 10a of the magnetic tripping device 9, has a stopper 61 at one end, and is fixed to a mounting plate 62 at the other end, and is equipped with a compression spring 15 as a biasing means for the reset lever. The reset lever 13 is biased toward the magnetic trip device 9. Said lever 1
1 and the reset lever 13 are tension springs 14
The magnetic tripping device 9 is connected by a movable armature 10 and is configured to transmit the movement of the lever 11 to the reset lever 13 via the tension spring 14.
is provided with a pin 10a at its tip, and said pin 10
a is driven in the reset direction by the engagement between the abutment plate 40 as an engagement portion provided on the pin 10a and the loose fitting portion 13b of the reset lever 13.

The internal structure of the magnetic trip device 9 is shown in FIGS. 7A and 7B. FIG. 7A shows the reset state, and FIG. 7B shows the state during tripping operation.

The magnetic tripping device 9 includes a support frame 4 made of a magnetic material.
1 and a yoke 42, a coil 45 and a permanent magnet 43 are provided in the case, a movable armature made of a magnetic material is fitted into the center of a bobbin 46 of the coil, and a guide 44 is provided. The movement of the movable armature 10 is transmitted to the outside via the movable armature. A compression spring 47 is provided between the collar 49 of the movable armature 10 and the bobbin 46 of the coil, and is configured to bias the movable armature 10 when the coil 45 is energized. The operation of the magnetic trip device is as follows.

Since magnetic flux passing through the movable armature 10 and the support frame 41 is normally supplied from the permanent magnet 43, the movable armature 10 overcomes the force of the compression spring 47 and is attracted to the support frame 41.

When a tripping current is supplied to the coil 45 from the tripping circuit 8, the coil 45 is connected to the permanent magnet 4.
This generates a magnetic flux in the opposite direction to the magnetic flux caused by the movable armature 10 and the support frame 41, thereby canceling out the attraction force between the movable armature 10 and the support frame 41. Therefore, the movable armature 10 is urged by the compression spring 47 and moves to a position where it comes into contact with the guide 45, as shown in FIG. 7B.

Next, the process of the tripping operation in this embodiment will be explained in the fifth section.
This will be explained with reference to FIGS. A to C, FIGS. 6 A to E, and FIGS. 7 A to B. Note that the manual trip button 20 and actuator 6c are not illustrated in FIGS. 5A to 5C and 6A to 6E.

During normal energization, as shown in FIGS. 5A and 6A, the tip 3a of the hook 3 is engaged with the engaging portion 4a of the trip fitting 4, and presses the contact portion 11a of the lever 11. are doing. In this state, the lever 11 pulls the reset lever 13 via the tension spring 14 and compresses the compression spring via the reset lever 13. Said reset lever 1
3 is stopped at a position beyond the stroke of the contact plate 40 due to the balance between the tension spring 14 and the compression spring 15. The trip fitting 4 is supported at its lower end 4d by a trip 34 provided on the pawl holder 5, and the upper part of the pawl holder 5 is locked by a stopper 6a, so the trip fitting 4 prevents the hook 3 from locking. Hold.

When a tripping current is supplied from the tripping circuit 8 to the magnetic tripping device 9 during a trip, the movable armature 10 is urged by the spring 47 and moves toward the yoke 42, as shown in FIG. 7B. As a result, the pin 10 provided at the tip of the movable armature 10
a is biased in the direction of arrow A and comes into contact with the actuator 6b as shown in FIG. 6B, and further rotates the pawl 6 around the support shaft 30 in the direction of arrow B as shown in FIG. 6C. to release the lock between the stopper 6a and the pawl receiver 5. Since the hook 3 is biased in the direction of arrow D by the biasing means (not shown) of the tripping mechanism 24, the force pushes up the trip fitting 4 in the direction of arrow C as shown in FIG. 5B. Rotate the trip metal fitting 4 to release the trip mechanism 2.
Remove 4.

At this time, since the pressing force from the hook 3 is no longer applied to the abutting portion 11a of the lever 11, as shown in FIG.
As shown in , the lever 11 becomes rotatable in the direction of the arrow F, and the reset lever 13 is urged in the direction of the arrow E by the restoring force of the compression spring 15, so that the loose fitting portion 13b
While pressing the contact plate 40, move it to the position where it contacts the stopper 61. As a result, the movable armature 10 is pushed back to the initial position, and is again attracted to the support frame 41 by the magnetic flux of the permanent magnet 43, returning to the initial state and resetting the magnetic tripping device 9. In this state, the circuit breaker is in a tripped state, and the handle 2 remains at the tripped position as shown in FIG. As described above, since the magnetic tripping device is reset with the tripping operation, the movable armature 10 is moved to the support frame 4.
It takes an extremely short time from when the coil 45 is energized until the hook 3 disengages from the trip fitting 4 to separate from the attraction surface of the hook 1. Therefore, the movable armature 10 is substantially constantly attracted to the suction surface of the support frame 41, and it is possible to prevent foreign matter from entering the suction surface and generation of dirt on the suction surface. To reset the circuit breaker, press handle 2 as shown in Figure 4.
This is done by returning the to the reset position. As a result of this handle operation, the hook 3 is urged in the direction of arrow H as shown in FIG. Since the trip fitting 4 has a U-shaped notch 4c that is loosely fitted onto the support shaft 32, the trip fitting 4 slides in the direction of arrow G due to the pressing force of the tip 3a of the hook 3, and the hook 3 further moves in the direction of arrow H. The reset mechanism is moved in the direction shown in FIG.
The state returns to the state shown in FIG. 6A again. At this time, the hook 3 presses the contact portion 11a of the lever 11, transmits the movement of the lever 11 to the reset lever 13 via the tension spring 14, and resets the reset lever 1.
3 to a position exceeding the stroke of the contact plate 40 and returned to the initial state.

According to this embodiment, during the tripping operation of the magnetic tripping device, the reset lever 13 is on standby at a position that is longer than the stroke of the pin 10a, and
Since the movement of the pin 10a is not obstructed, the driving force of the pin 10a can be small, and the device can be made smaller and lighter. In addition, during normal operation and reset, the lever 11 is moved by the hook 3.
is pressed, but when the lever is tripped, the pressure is released, and the resulting rotational movement of the lever is used to drive the reset mechanism, so a constant reset force can be obtained. In addition, since no excessive force is applied to each component, deformation of the components is less likely to occur, resulting in a long life. In other embodiments, a return spring 15' may be provided on the pin 10a and the guide may be omitted, as shown in FIG.
Since the stroke of the return spring 15' is small, there is sufficient stress on the return spring 15' at the time of reset. Also,
The biasing means for the reset lever may be a tension spring 15 as shown in FIG. Furthermore, the biasing means may be a torsion spring 50 as shown in FIG. Furthermore, as shown in FIG.
If it is provided in the position, the position adjustment work during assembly will be simplified.

Further, in a different embodiment, the reset lever 53 may be moved horizontally as shown in FIG. Can be stored. Note that the guide 63 may be provided on one side if configured as shown in FIG. 12B. In this case, the tension spring 14 receives a bending force when passing through the guide plate 42, but since the spring material has elasticity, it does not deform. In yet another embodiment, the reset plates 54, 54' may be made of elastic material, as shown in FIGS. 13A and 13B. According to this, the mechanical part is simplified, the number of assembly steps is reduced, and the device can be made smaller and lighter. The elastic body may be a leaf spring or a soft synthetic resin plate. In this case, the mounting portion of the tension spring 14 may be provided with reinforcement (not shown) if necessary. FIG. 14 shows the shape of the reset lever and guide. In this embodiment, as shown in FIG. 14A, the reset lever is provided with a loose fitting portion for the pin and the guide. The shape of the loose fitting part between the reset lever and the guide is as shown in FIGS.
The upper end of the reset lever 13 may be used as it is as shown in c', or it may be provided with a notch as shown in 13c''.Also, the guide may be cut out at 63'' as shown in Fig. 14E and F. 13c the engaging part as a strip
It may also be grooved like this. In addition, the loose fitting portion between the reset lever 13 and the pin 10a is shown in FIGS. 14D and F.
A notch may also be used as shown in Fig. 2, and this will improve workability when assembling parts.

Further, the lever 11 may also be used as an operation lever for an alarm switch (not shown) as an internal accessory device.

〔Effect of the invention〕

According to the present invention, the reset operation of the magnetic tripping device can be performed reliably immediately after tripping, and the intrusion of foreign matter into the suction surface of the movable element is prevented from causing dirt on the suction surface, thereby preventing malfunction. Furthermore, it is possible to obtain a molded circuit breaker that is configured to prevent the biasing means from interfering with the tripping operation of the movable element during tripping, and is capable of high-speed operation and has high reliability.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing the configuration of a molded circuit breaker according to an embodiment of the present invention, and FIGS.
The figures are longitudinal sectional views showing the configuration of the main parts of a molded circuit breaker according to an embodiment of the present invention during normal energization, tripping, and resetting, respectively, and Fig. 5 shows a hook and trip fitting according to an embodiment of the present invention. 6 is a front view showing the operating process of the reset mechanism in an embodiment of the present invention, and FIG. 7 is a longitudinal sectional view of the magnetic tripping device in an embodiment of the present invention. Figure 8, Figure 9, Figure 10, Figure 11
12 is a front view showing another embodiment of the invention, FIG. 13 is a front view showing still another embodiment of the invention, and FIG. 14A is a front view showing another embodiment of the invention. A perspective view showing the shape of the reset lever guide pin in one embodiment of the present invention, No. 14
Figures B to F are side views showing the shape of a reset lever guide pin in another embodiment of the present invention. 2...Handle, 3...Hook, 4,5,6...
...Engagement portion, 8...Tripping circuit, 9...Magnetic tripping means, 10...Mover, 10a...Tripping force transmission means, 11, 14...Biasing release means, 13, 15
...Biasing means, 24...Contact opening/closing mechanism, 25...
Tripping mechanism.

Claims (1)

[Claims] 1. A contact opening/closing mechanism including a hook linked to a handle for opening/closing the opening/closing contact, and an engaging portion that engages with the hook and releases the engagement by tripping. In a molded circuit breaker comprising a tripping mechanism and a tripping circuit that supplies a tripping signal to the tripping mechanism, the tripping mechanism has a tripping force that transmits the tripping force to the engaging portion. a magnetic tripping means having a movable element connected to a transmission means and operating the movable element in the tripping direction upon receiving the tripping signal; biasing means for biasing the magnetic tripping means toward the reset position; and biasing the biasing means in the reset direction in response to engagement of the hook interlocked with the handle with the engaging portion. A hardwired circuit breaker comprising an energizing release means for releasing the energization.