JPH05266779A - Tripper for circuit breaker - Google Patents

Abstract

PURPOSE:To reduce the kind of electromagnetic coil, and facilitate the winding work in a tripper provided with plural coils respectively having different winding specification. CONSTITUTION:Single-winding electromagnetic coils 6, which are obtained by separately winding coils 13, 14 around of the same shape bobbins 8 per each winding specification, are prepared, and these single winding electromagnetic coils 6 can be arranged in any combination to form the required specification. Kind of electromagnetic coil is thereby reduced in comparison with the conventional structure that a coil is wound around of a common bobbin each time in response to the combination of the winding specification, and since the coil is single-winding, the winding work is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trip device which is used by incorporating it into a circuit breaker such as a circuit breaker for wiring or an earth leakage breaker, and more particularly to a trip device having a plurality of types of trip functions.

[0002]

2. Description of the Related Art FIG. 3 is a side view showing an essential part of a conventional trip device of this type. In the figure, 1 is a trip electromagnet,
Reference numeral 2 denotes a trip lever which is interlocked with this, and the structure of the trip lever 2 is shown in principle. The tripping electromagnet 1 has a configuration in which an annular electromagnetic coil 6 and a pair of permanent magnets 7 are arranged so as to surround a fixed iron core 4 fixed to the center of a U-shaped yoke 3 and a movable iron core 5 facing the fixed iron core 4. The movable iron core 5 is slidably guided by the bobbin 8 of the electromagnetic coil 6.

One end of a trip rod 9 penetrating the yoke 3 and the fixed iron core 4 with a gap is fixed to the movable iron core 5, and between the head 9a at the other end of the trip rod 9 and the yoke 3. A return spring 10 composed of a compression coil spring is inserted. The movable iron core 5 is constantly urged by a return spring 10 in a direction in which it strikes the fixed iron core 4. An iron piece 11 is inserted between the permanent magnet 7 and the movable iron core 5, and both legs of the yoke 3 are connected by a yoke piece 12. As shown in FIG. 4, the bobbin 8 has a rectangular outer shape that fits inside the yoke 3, and has coil windings 13 having different winding specifications in two winding grooves 8a formed at both ends and a central collar. And 14
Is wrapped around each.

On the other hand, the trip lever 2 is rotatably supported by a mold case (not shown) via a pin 15 and is rotated clockwise by a trip spring 16 which is a tension coil spring hung between the trip lever 2 and the mold case. The pulling rod 9 is attracted to the head portion 9a of the tripping rod 9. The tip end of the trip lever 2 faces the trip crossbar 17 of the circuit breaker with a gap in the illustrated state in which the movable iron core 5 is in contact with the fixed iron core 4.

In such a configuration, assuming that the coil windings 13 and 14 are for overcurrent trip and voltage trip, respectively, the coil windings 13 and 14 are energized when the circuit breaker is closed. However, the movable iron core 5 is a trip spring that acts via the trip lever 2 only by the magnetic flux of the permanent magnet 7 passing through the magnetic path of the yoke piece 12 → the iron piece 11 → the movable iron core 5 → the fixed iron core 4 → the yoke 3. Against the power of 6
It is adsorbed on the fixed iron core 4 as shown.

When a trip command is applied to the electromagnetic coil 6, the coil winding 13 or 14 is energized so that a magnetic flux in the direction opposite to that of the permanent magnet 7 is generated. Therefore, the magnetic flux of the permanent magnet 7 is weakened, the force of the tripping spring 6 overcomes the attraction force, and the movable iron core 5 is separated from the fixed iron core 4 as shown in FIG. Along with this, the trip lever 2 moves the trip spring 1
The force of 6 rotates clockwise in FIG. 3 to push the trip crossbar 17. As a result, the lock of the opening / closing mechanism (not shown) is released, and the movable contact is opened. When the movable iron core 5 moves away from the fixed iron core 4, the magnetic resistance increases and the attraction force to the movable iron core 5 decreases sharply.
For example, even if the magnetic flux of the coil windings 13 or 14 becomes 0 at the time of moving to the stroke S in FIG. 5, the movable iron core 5 continues to move until the return spring 10 is completely compressed.

[0007]

As described above, the trip device having a plurality of coil windings with different winding specifications is
It is possible to convert a plurality of trip signals that differ for each coil winding into one mechanical operation. In such a trip device, the bobbin 8 common to the coil windings 13 and 14 has a plurality of winding grooves 3a and 3b in the illustrated conventional configuration.
The coil windings 13 and 14 having different wire diameters and numbers of turns are wound around these winding grooves 3a according to the winding specifications.

Therefore, conventionally, the winding management of the electromagnetic coil corresponding to the combination of the winding specifications is complicated, and the bobbin becomes long, so the workability of the winding work itself is poor.
Further, since it is necessary to manufacture an electromagnetic coil for each combination of winding specifications, there are many types of electromagnetic coils, and inventory management is troublesome. Therefore, the present invention makes it possible to arbitrarily combine coil windings having different winding specifications, reduce the types of electromagnetic coils, facilitate management, and simplify winding work to reduce costs. The purpose of the present invention is to provide a trip device of the above.

[0009]

In order to achieve the above object, the present invention provides a single coil electromagnetic coil in which coil windings are separately wound around bobbins of the same shape for each winding specification. It is configured according to the type of winding specifications, and a plurality of these electromagnetic coils are arranged in a required combination.

[0010]

[Operation] By arranging the electromagnetic coils of single coil windings having the same bobbin shape in any combination to form the electromagnetic coil having the required specifications, the number of types of electromagnetic coils is limited to the number of types of winding specifications. The number of types of electromagnetic coils is reduced as compared with the case of separately preparing electromagnetic coils according to various combinations of winding specifications. Further, since a single coil winding is wound on the bobbin of the same shape, the winding work is simplified and automation is facilitated.

[0011]

1 and 2 show an embodiment of the present invention. FIG. 1 is a side view and FIG. 2 is a perspective view of the bobbin in FIG. The same reference numerals are used for the portions corresponding to the conventional example. The trip device of FIG. 1 differs from the conventional example in that the coil windings 13 and 14 are separately wound on the bobbin 8 of the same shape shown in FIG. The single-winding electromagnetic coils 6 are prepared in accordance with the types of winding specifications, and are arranged in the yoke 3 in any combination as required.

As shown in the figure, when there are two coil windings 13 and 14, as the combination of the winding specifications, one of them is an overcurrent trip and the other is a voltage trip, an undervoltage trip or an earth leakage trip. And one of them is either a voltage trip or an undervoltage trip for the earth leakage trip. In the case of the undervoltage trip, the magnetic flux of the coil winding 13 or 14 to which the circuit voltage is applied adsorbs the movable iron core 5 in cooperation with the permanent magnet 7, and the circuit voltage decreases and the coil winding 13 Alternatively, when the magnetic flux of 14 decreases, the attraction force is insufficient as a whole, and the trip device operates.

According to the illustrated embodiment, the electromagnetic coil 6 is provided on the bobbin 8 of the same shape, and the coil winding 1 is separately provided for each winding specification.
Since 3 and 14 are wound, only the number of winding specifications is required as the type of the electromagnetic coil 6, and a combination of two winding specifications selects and arranges the required two from these electromagnetic coils 6. It can be formed freely. Further, since the bobbin 8 is short and has a single winding, winding work is easy.

[0014]

According to the present invention, by combining a single-winding electromagnetic coil in which a coil winding is separately wound around a bobbin of the same shape for each winding specification, the required specifications are formed, and thus the electromagnetic coil is formed. The number of types is small and management is easy, and the winding work is simple and the man-hours can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a perspective view of the bobbin in FIG.

FIG. 3 is a side view of a conventional example.

FIG. 4 is a perspective view of the bobbin in FIG.

5 is a view showing a state in which the trip electromagnet in FIG. 3 is operated.

[Explanation of symbols]

 1 tripping electromagnet 2 tripping lever 3 yoke 4 fixed iron core 5 movable iron core 6 electromagnetic coil 7 permanent magnet 8 bobbin 9 tripping rod 10 return spring 13 coil winding 14 coil winding 16 tripping spring

Claims (1)

[Claims] 1. A trip device for a circuit breaker comprising a plurality of coil windings having different winding specifications, wherein the coil windings are individually wound on bobbins of the same shape for each winding specification, and a single coil is provided. A tripping device for a circuit breaker, characterized in that electromagnetic coils of a winding are constructed according to the type of the winding specifications, and a plurality of these electromagnetic coils are arranged in a required combination.