JPS639336B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit breaker and, more particularly, to a circuit breaker having a gap adjustment device between a fixed core and a movable armature.

In the case of multi-pole circuit breakers, it is desirable that there be no difference between the instantaneous tripping current values when each pole is tripped. For this reason, in the conventional tripping section structure, in order to minimize the difference in the tripping current value between each pole, the gap between the fixed core and the movable armature is adjusted using an adjustment screw provided for each pole. In other words, the gap is adjusted. Furthermore, it is desired to easily change the trip characteristics of circuit breakers and disconnectors from the outside, and the trip characteristics are changed using an adjustment dial.

FIGS. 1A and 1B show an example of an adjustment mechanism in such a conventional tripping section. Here, 1 is a movable armature, and 2 is a fixed core. 3 is an adjustment screw provided to adjust the gap G between the movable armature 1 and the fixed core 2, and the adjustment screw 3 of each pole is provided on a common shaft 4 as shown in FIG. 1A. It is used to adjust the gap G for each pole. In this way, by making the gap G of each pole substantially constant, it is possible to obtain the same tripping characteristics at each pole. Reference numeral 5 denotes an adjustment dial for adjusting the common shaft 4 itself, and by operating this dial 5 from the outside, the tripping characteristics of the shear breaker can be arbitrarily changed.

6 is a coil spring that biases the armature 1 to the adjustment screw 3; 7 is a conductor that connects the power supply side and the load side; when an overcurrent of more than a predetermined value flows through this conductor 7, a magnetic force is applied to the fixed core 2; occurs, and the movable armature 1 is attracted to the fixed core 2 against the spring force of the spring 6. As a result, the opening/closing device 8 is linked to the operation of the movable armature 1, and the circuit is quickly disconnected via the operating section. Note that 9 is a bimetal attached to a conductor.

However, in the conventional gap adjustment mechanism for such a tripping section, the gap adjustment corresponding to the instantaneous tripping current value is performed by moving the adjustment screw 3 or common shaft 4 that adjusts the difference between the gap for each pole. The interlocking mechanism of the adjustment dial 5 and the like has a complicated structure, a large number of parts, and high costs.

It is an object of the present invention to eliminate the above-mentioned drawbacks, to maintain a constant gap between the movable armature and the fixed core at each pole without making complicated adjustments, and to significantly reduce the number of parts of the trip characteristic adjustment device. The object of the present invention is to provide a circuit breaker with reduced circuit loss.

That is, the present invention includes a fixed core disposed so as to surround a conductor through which a main circuit current to be opened and closed flows, and a movable armature disposed opposite to the fixed core. The movable armature is attracted to the fixed core by the magnetic force generated in the fixed core, and the movable armature drives the opening/closing device to perform the trip operation, and the overcurrent value for the trip operation can be adjusted. In a circuit breaker, a connecting bar is provided in common for all poles and rotatably supported on the case of the cutter, and a connecting bar is provided for each pole and supported on the connecting bar, respectively. a movable armature which is urged toward the engaging portion of the connecting bar by a spring and is normally held at a normal rotation angle position with respect to the connecting bar; and an adjustment lever protruding from the connecting bar. an eccentric cam having an eccentric circumferential surface with which the end of the adjustment lever abuts under spring bias, and by rotating the eccentric cam, the connecting bar is rotated, and the fixed core of the movable armature is rotated. The movable armature operates for each pole to perform the trip operation when a predetermined overcurrent flows through the conductor. It is something to do.

The present invention will be explained in detail below based on the drawings.

FIGS. 2A, B and C show an embodiment of the present invention, and show a tripping section and a device for adjusting the instantaneous tripping current value. First, the outline of the tripping section will be explained. The conductor 10 is fixed together with the fixed core 11 and the bimetal 12 using rivets 13, and is attached to the case 15 using tightening screws 14.
Reference numeral 16 denotes a movable armature having a shape as shown in FIG. 3, and is disposed opposite to the fixed core 11 with a predetermined gap G therebetween. Reference numeral 17 denotes a connecting bar, which, as shown in FIGS. 4A and 4B, has a movable armature hooking portion 17A with a substantially square cross section, and a constricted portion 17B with a circular cross section formed between the hooking portion 17A and at both ends. ′. The movable armature 16 is attached to the connecting bar 17 by fitting the opening grooves 16A of the movable armature 16 into the constricted portions 17B on both sides of the hooking section 17A. Furthermore, movable amateur 16
A spring 18 is stretched between the spring hooking portion 16B of the connecting bar 17 and the spring hooking portion 17C of the connecting bar 17. This spring 18 causes the engaging portion 16 of the movable armature 16 to
C is engaged with the engaging protrusion 17D of the connecting bar 17 (see FIG. 5), and the movable armature 16 and the connecting bar 1 are
The relative positional relationship with 7 is maintained constant. This allows the gap G at each pole to be approximately constant. The spring 18 is also used as a return spring when the movable armature 16 is released from the fixed core 11. As described above, the movable armature 16 is connected to the connecting bar 1 by the opening groove 16A.
7, so the movable armature 1
6 can be easily attached and detached. Also, movable amateur 1
Since the contact area between the connecting bar 6 and the connecting bar 17 is small, there is little wear. Furthermore, since the two opening grooves 16A sandwich the hooking portion 17A from both sides, the center of the movable armature 16 can be easily determined. In addition, in FIG. 3, the screw hole 16D is a mounting portion for an adjustment screw 20, which will be described later.

Also, referring to FIGS. 4A and 4B, connecting bar 1
7 is molded from a resin material, and a metal core bar 19 is embedded in the center in the longitudinal direction to also strengthen the axial deflection strength, and a part of the core bar 19 is extended upward to adjust the gap. A lever 19A is formed. In FIGS. 2A and 2B, 20 is an adjustment screw attached to the movable armature 16, and when tripping, the head of this screw 20 rotates the crossbar 21 around the crossbar shaft 21A to complete the circuit. I refuse. That is, the movable armature 16 drives the opening/closing device consisting of the cross bar 21 and the like via the adjusting screw 20, and the circuit is immediately disconnected. Further, the adjustment screw 20 is used to finely adjust the tripping current value for each pole. Further, this adjustment screw 20 is attached at a position away from the center of the movable armature 16. In a space 16E at the center of the movable armature 16, an adjustment screw 12A of the bimetal 12 is disposed facing the crossbar 21.

Here, FIGS. 6A and 6B show the state in which the movable armatures 16 of each pole are attached to the connecting bar 17, and the connecting bar 17 and movable armature 16 assembled in this way are assembled as shown in FIG. 2C. Then, fixing metal fittings 22 are attached to both ends of the connecting bar 17 and fitted into the grooves 23 of the case 15, so that the connecting bar 17 can freely rotate around the axis 24. After fitting the constricted portion 17B of the connecting bar 17 into the groove 23 of the both side walls of the case 15 or the partition wall between each pole in this way, the case cover 15A is placed over the case 15 to support the connecting bar 17. Therefore, attachment of the connecting bar 17 becomes easy.

Next, the connecting bar 17 was slightly rotated around its axis 24 using a gap adjustment lever 19A provided on the connecting bar 17 to adjust the gap G, thereby changing the tripping characteristics of the shear breaker. The adjustment device will be explained.

In FIGS. 2A, B, and C, 25 is an adjustment dial device, and 26 is a support fitting to which the dial device 25 is attached, and by fitting this support fitting 26 into the groove 27 of the case 15, the dial can be adjusted. Hold device 25 in the position shown. As shown in detail in FIG. 7A, this support fitting 26 has a notch protrusion 26A, and when it is fitted into the groove 27 (see FIG. 2A), the protrusion 26A pushes the support fitting 26 against the wall surface of the groove 27. Since it is biased to the side, rattling after installation can be prevented and the adjustment of the gap G, which will be described later, will not be affected.

7A and 7B show details of the adjustment dial device 25, where 251 is the dial device 2.
This is the stopper part of No.5. A locking projection 251A is provided on the stopper portion 251, and the stopper portion 251 is fixed to the support fitting 26 by the locking projection 251A. The stopper part 251 is made of, for example, a synthetic resin material, and a spring part 251C having a pawl protrusion 251B as shown in the figure is provided in a cutout part thereof. 252 is a dial with a screwdriver groove 252A engraved on the top for adjustment;
52 and an eccentric cam 253 attached to the lower surface thereof are connected by a spring leg 252B of the dial 252,
These are attached to the support fittings 26. Further, a tooth pattern 252C is carved along the circumferential surface of the dial 252, and a stopper 251 is formed in the valley of this tooth pattern 252C.
The pawl protrusion 251B of the cam 253 is kept in a desired position by engaging with the pawl protrusion 251B.

254 is a spring hook part 19B formed on the lever 19A of the support fitting 26 and the connecting bar 17 (see FIG. 4A,
It is a coil spring hooked between the
The spring force of the spring 254 always biases the lever 19A toward the cam 253 of the dial device 25, thereby bringing the lever 19A into contact with the cam 253.

Next, the operation of gap adjustment in the adjusting device configured as described above will be explained. As shown in FIG. 2A, the adjustment dial device 25 is provided at a position where its dial 252 coincides with the top surface of the case cover 15A, so a screwdriver is inserted into the screwdriver groove 252A provided on the dial 252. , and the dial 252 can be easily rotated in a desired direction. During this rotation, dial 2
As shown in FIG. 7C, the teeth 252C provided on the spring 52 are lifted one by one over the pawl protrusions 251B of the spring portion 251C against the spring force of the spring 251C. This dial 2
Eccentric cam 25 rotated by the rotation of 52
3 slightly rotates the adjustment lever 19A of the connecting bar 17, which is in contact with the cam surface of the eccentric cam 253 by the spring force of the spring 254, around the axis 24 of the bar 17 (see FIG. 2A). .

In this way, the movable armature 16, which remains engaged with the connecting bar 17 by the spring force of the spring 18, is rotated around the axis 24 by an angle corresponding to the slight rotation of the lever 19A. , the gap G between the movable armature 16 and the fixed core 11
can be easily adjusted, and the tripping characteristics of the external mustard breaker can be changed arbitrarily.

As explained above, according to the present invention, the movable armature of each pole is attached to the connecting bar, and the engaging portion of the connecting bar and the engaging portion of the movable armature are engaged, thereby connecting the movable armature and the fixed core. In addition, an adjustment lever is formed on the connecting bar, and this lever is brought into direct contact with the eccentric cam of the adjustment dial device, so that the rotation of the eccentric cam by the dial is directly controlled. Since the drive is transmitted to the lever and the connection bar is rotated, the number of parts in the tripping section structure can be reduced, the structure is simple, and an inexpensive gap adjustment device can be obtained.

It goes without saying that the present invention is applicable not only to wiring circuits and disconnectors, but also to a wide range of general circuits and circuit disconnectors, such as electric leakage circuits and disconnectors.

[Brief explanation of the drawing]

Figures 1A and B are front and side views, respectively, showing an example of a gap adjustment mechanism between the movable armature and the fixed armature in the conventional tripping section of a circuit breaker. A front view, a top view, and a side view showing an example of the structure of the tripping part of the circuit breaker according to the invention, FIG. 3 is a perspective view showing an example of the armature, and FIG. 4A is a perspective view showing an example of the connecting bar. Fig. 4B is the front view, Fig. 5
6A and 6B are front and side views showing the state in which the connecting bar and the movable armature of each pole are assembled, respectively. Diagrams A and B
7C is a sectional view and a diagram showing an example of the configuration of the adjustment dial device in the tripping part structure according to the present invention as seen from above, respectively, and FIG. 7C is a diagram showing the operation when the dial is rotated as seen from above. be. 1... Amateur, 2... Fixed core, 3... Adjustment screw, 4... Common shaft, 5... Adjustment dial, 6... Coil spring, 7... Conductor, 8... Switchgear, 9... Bimetal, 10... Conductor, 11... Fixed core , 12... Bimetal, 12A... Adjustment screw, 13... Rivet, 14
...Screw, 15...Case, 15A...Case cover,
16...Movable armature, 16A...Opening groove, 16B
...Spring catch part, 16C...Engagement part, 16D...Screw hole, 16E...Space, 17...Connection bar, 17A...Movable armature catch part, 17B...Neck part, 17C
...Spring hook part, 17D...Engagement protrusion, 18...Spring,
19...Core metal, 19A...Adjustment lever, 20...Adjustment screw, 21...Cross bar, 22...Fixing metal fitting, 23...
Groove, 24... Axial center, 25... Dial device, 26... Support metal fitting, 26A... Projection, 27... Groove, 251... Stopper part, 251A... Latching projection, 251B... Pawl projection, 251C... Spring part, 252... Dial, 2
52A...Groove, 252B...Spring leg, 252C...Tooth pattern, 253...Cam, 254...Spring.

Claims (1)

[Claims] 1. A fixed core arranged to surround a conductor through which a main circuit current to be opened and closed flows, and a movable armature arranged opposite to the fixed core, and when an overcurrent flows through the conductor. The movable armature is attracted to the fixed core by the magnetic force generated in the fixed core, and the movable armature drives the opening/closing device to perform a trip operation, and the overcurrent value for the trip operation can be adjusted. In a pole-type circuit breaker, there is a connecting bar that is provided in common to all poles and rotatably supported on the case of the breaker, and a connecting bar that is provided for each pole and is mounted on the connecting bar, respectively. a movable armature that is supported and urged toward the engaging portion of the connecting bar by a spring and is normally held at a normal rotation angle position with respect to the connecting bar; and a movable armature that projects from the connecting bar. The movable armature is provided with an adjustment lever and an eccentric cam having an eccentric circumferential surface with which the end of the adjustment lever abuts under spring bias, and by rotating the eccentric cam, the connecting bar is rotated and the movable armature is rotated. The proper position relative to the fixed core can be adjusted at once for all poles, and when a predetermined overcurrent flows through the conductor, the movable armature operates for each pole to perform the trip operation. A circuit disconnector featuring: 2. In the circuit breakout switch according to claim 1, the connecting bar is molded from a resin material, and a reinforcing core metal is embedded in the longitudinal center of the connecting bar,
A circuit switch and disconnector characterized in that the adjustment lever is integrally formed with the reinforcing core metal. 3. In the circuit breaker and disconnector according to claim 1, a case cover is placed over the case to cover each member housed in the case, and the connecting bar is connected to the case and the case cover. A circuit breaker characterized by being supported by a groove formed on the mating surface. 4. In the circuit breaker according to claim 1, the connection bar is formed in a movable armature hook portion having a rectangular cross section, between the movable armature hook portions and at the ends thereof, and 1. A circuit breaker characterized by having a partition wall of each pole and a constricted portion having a circular cross section that is pivotally supported on the side wall. 5. In the circuit breakout switch according to claim 4, the movable armature has an opening groove, and the opening groove is fitted into the constricted portions on both sides of the movable armature latching portion to prevent the movable armature from moving. A circuit breaker characterized by supporting an amateur. 6. In the circuit breaker according to claim 1, when the movable armature is released from the fixed core, the spring biasing the movable armature against the connecting bar causes the movable armature to move toward the normal position. A circuit disconnector characterized in that the circuit is returned to its original position. 7. In the circuit breaker according to claim 1, the movable armature has an adjustment screw disposed facing the switching device, and finely adjusts the overcurrent trip current value for each pole. A circuit disconnector characterized in that the adjustment is performed using the adjustment screw. 8. In the circuit breaker according to claim 5, the movable armature has an engaging portion connected to the opening groove, and the engaging portion is engaged with the engaging portion of the connecting bar. A circuit breaker or breaker characterized in that it is configured to