JPS583247Y2 - electromagnetic breaker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic breaker in which the trip current can be adjusted even after the electromagnet is installed in the casing.

Generally, an electromagnetic breaker such as a circuit breaker for wiring has an electromagnetic actuating section 7 consisting of an electromagnet 1, a yoke 3, and an armature 5, as shown in FIG.

One end of the yoke 3 is joined to one end of the electromagnet 1, and the other end extends to a position adjacent to the other end of the electromagnet 1, where the armature 5 is swingably supported.

The armature 5 has a spring (
(not shown), but when the attractive force reaches a certain value, it is pulled by an electromagnet and swings.

This rocking actuates the trip mechanism 9 shown schematically in FIG.
The circuit is cut off by separating the movable contact support 15 communicating therebetween from the fixed contact.

Such I-lip mechanisms are well known and will not be described in detail here.

The electromagnet of such a circuit breaker is normally constructed in such a way that its pulling current can be adjusted, and for this purpose a cap 21 made of magnetic material is attached to the armature side of the cylinder 19 around which the coil 17 is wound. Fix and also cylinder 1
an adjusting screw 29 in which a core 23 of magnetic material is disposed axially movably within the yoke 9, biased away from the cap 21 by a spring 25, and threadedly engaged with a bracket 27 fixing the core 23 to the yoke 3; By adjusting the magnetic cap G so as to move it closer to or away from the cap 21, the tripping current to obtain a constant magnetic force was made variable.

Such an electromagnetic actuator 7 is attached to the base 28 of the casing, and then a removable cover 30 is fitted to the base, but the lever 11 of the trip mechanism 9 is placed on the side where manual operation is easy, that is, on the cover side of the base. Accordingly, the trip mechanism as a whole is also provided on the cover side of the base, and therefore, the electromagnetic actuating section 7 is also usually installed with the armature 5 that interlocks with the trip mechanism facing the cover side.

In this arrangement, once the electromagnetic actuator 7 is assembled into the casing, it is impossible to insert a tool such as a screwdriver up to the adjustment screw 29. Therefore, in conventional circuit breakers, the tripping current must be adjusted before assembly. If a product fails the test after assembly, it has the disadvantage that it cannot be corrected without disassembling it again.

The present invention provides a breaker in which the tripping current can be easily adjusted by simply removing the cover even after the electromagnetic actuating part is assembled into the casing.

FIG. 3 shows the electromagnetic actuating part in one embodiment of the breaker according to the present invention, which includes an electromagnet 1, a yoke 3,
Coil 17 is of the same construction as in FIG.

The cylinder 31 supporting the coil 17 is an armature 33
A cap 35 of magnetic material is fixed to one end, and the opposite end is a closed end.

A core 37 of magnetic material is housed within the cylinder 31 so as to be axially movable and is biased toward the cap 35 by a compression spring 32 provided between the cylinder 31 and the closed end of the cylinder 31 .

An adjustment crotch 39, preferably of a non-magnetic material, extends through and engages the cap 35.

Therefore, by rotating the screw, the core 37 can be attached to the cap 3.
It is possible to adjust the tripping current by changing the gap G by moving it closer to or away from 5.

An opening 33a is provided in the armature 33 at a position corresponding to the adjustment screw 39 so that when the armature 33 is attracted by the electromagnet 1 and oscillates toward the cap 35, the adjustment screw 39 does not interfere with its oscillation.

According to the present invention, with the above-described configuration, it is possible to provide the adjustment screw 39 on the armature side of the electromagnet, and therefore, even after the electromagnetic actuating part is assembled into the casing, if the cover 30 is removed, a tool such as a screwdriver can be used. can be easily reached to the adjusting screw 39 through the opening 33a of the armature, and the tripping current can be easily adjusted.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view illustrating the configuration of the electromagnetic actuating part of a conventional breaker; Fig. 2 is a cross-sectional view of the breaker showing the position of the electromagnetic actuating part shown in Fig. 1 within the casing; The figure is a partial sectional view illustrating the structure of the electromagnetic actuating part of the electromagnetic breaker according to the present invention. 1...Electromagnet, 3...Yoke, 7...
....Electromagnetic actuating part, 9...Trip mechanism, 1
7... Coil, 28... Base, 30.
...cover, 31... cylinder, 32.
...compression spring, 33...armature,
33a...opening, 35...cap,
37...core, 39...adjustment, G.
...magnetic gap.

Claims (2)

[Scope of utility model registration request] (1) A casing consisting of a base and a cover that is removably attached to the base, an electromagnet provided in the casing, a yoke that is fixed at one end to one end of the electromagnet and whose other end extends to a position adjacent to the other end of the electromagnet; The armature is biased in a direction opposite to the attraction force of an electromagnet that is swingably attached to the other end of the yoke, and swings toward the electromagnet when the attraction force reaches a certain value, so that the armature faces the cover side. An electromagnetic breaker including an electromagnetic actuator attached to the base and a trip mechanism that interrupts a circuit in response to swinging of the armature,
The electromagnet includes a cylinder having a coil disposed on the outer periphery, a cap made of a magnetic material attached to the armature side of the cylinder, an adjusting screw that passes through the cap and threadably engages with the cap, and rotation of the adjusting screw. a core of a magnetic material that moves in the axial direction within the cylinder and changes the magnetic gap between it and the cap, and each of the armatures has an opening so as not to interfere with the adjustment screw when attracted by the electromagnet. An electromagnetic breaker characterized by being provided with. (2) Utility model registration scope In the electromagnetic breaker according to claim 1, the end of the cylinder opposite to the armature is a closed end, and the core is provided between the end and the closed end. An electromagnetic breaker, characterized in that the electromagnetic breaker is configured to be brought into pressure contact with an end of the adjusting screw by a compression spring.