JPS5934042Y2 - Thermal electromagnetic overcurrent trip device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thermal electromagnetic overcurrent release device that combines a bimetallic time-delayed release mechanism and an electromagnetic release mechanism that performs instantaneous release.

Generally, this type of tripping device has a U-shaped yoke and an armature surrounding the electrical circuit, and the armature is biased by a spring in the direction away from the yoke. The armature is attracted and rotated by the magnetic flux generated around it. Conventionally, as shown in Fig. 1, a pin 8 is used to connect the yoke 1 and the armature 2.
However, after inserting the pin 8 into the shaft hole 7, it was necessary to process the end of the pin to prevent it from being pulled out or to fit a ring to prevent it from being pulled out, which added to the time-consuming assembly process and required parts to be removed. The drawback was that the number of points would increase.

In order to solve the above-mentioned problems, the present invention aims to provide a yoke and armature assembly structure that integrates the rotation shaft of the armature into the armature, is easy to assemble, and can prevent the rotation shaft from falling off. That is.

The thermal electromagnetic overcurrent tripping device of the present invention will be described in more detail below with reference to the drawings. As shown in FIGS. 3, forming a magnetic path surrounding bimetal 3
In the overcurrent breaker tripping device, the armature 2 is attracted and rotated by detecting a large current flowing through the armature 2, and the armature 2 drives the circuit breaking mechanism 4. 5 and 6 are provided with shaft holes 7, and rotating shafts 8 are integrally provided from both side edges of the armature 2, so that the lengths of both the rotating shafts 8 are different, and the longer rotating shaft 8 A coarsely wound torsion coil spring 9 is interposed between the rotating shafts 8 and the rotating shafts 8 are respectively inserted into the shaft holes 7, and the rotation shafts 8 are positioned between one leg piece 6 of the yoke 1 and the armature 2, and both ends are connected to the yoke. A torsion coil spring 9 fixed to the armature 1 and the armature 2 biases the armature 2 to rotate in a direction away from the yoke 1, and also biases the armature 2 in the axial direction of the rotation shaft 8, thereby changing the rotation angle of the armature 2. An engaging portion 10 that regulates the 11 is provided on the yoke 1 and the armature 2.

In FIGS. 2 and 3, the bimetal 3 is connected to a movable contact 14 and a load-side terminal 15 by lead wires 12 and 13, respectively, and when an overcurrent flows, the bimetal 3 bends and Tripping plate 1
7 and thereby the tripping plate 17 is slightly rotated clockwise, the known circuit breaking mechanism 4 operates to separate the movable contact 14 from the fixed contact 18.

Furthermore, when an overcurrent exceeding a certain value flows, the magnetic flux generated around the bimetal 3 flows through the armature 2 of the yoke 1, which has low magnetic resistance, and the armature 2 is attracted to the yoke 1, as shown in Fig. 2. The protrusion 19 of the armature 2 rotates the tripping plate 17 and instantaneously operates the circuit breaking mechanism.

In addition? 20 is an overcurrent detector. As shown in Fig. 3, the feature of the present invention is that the rotation shafts 8 are integrally protruded from both side edges of the armature 2, and the lengths of both rotation shafts 8 are different, so that the longer rotation A roughly wound torsion coil spring 9 is interposed on the shaft 8, and the rotation shafts 8 are inserted into the shaft holes 7, respectively, and the yoke 1
A torsion coil spring 9 is positioned between one of the leg pieces 6 and the armature 2.

With this configuration, when attaching the armature 2 to the yoke 1, as shown in FIG. The armature 2 can be easily mounted by inserting the end of the rotary shaft 8 into the shaft hole 7, compressing the spring 9, and inserting the other end of the rotation shaft 8 into the other shaft hole 7, and once assembled. The armature 2 is prevented from shifting in the lateral direction by the spring 9 and the rotation shaft 8 does not fall out of the shaft hole 7.

As mentioned above, the present invention can be easily assembled even if the armature is integrally provided with the rotation shaft, and the torsion coil spring that biases the armature away from the yoke prevents the rotation shaft from coming off. Since there is no such thing, the number of assembly steps can be reduced and the number of parts can be reduced.Therefore, there is an advantage that the bottom of the armature can be stamped out of a single iron plate together with the rotating shaft as in the embodiment.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of the main parts of the conventional example, Fig. 2a is a longitudinal sectional view of the earth leakage breaker according to the present invention, b is a side view of the main parts of the same, and Fig. 3 is a perspective view of the main parts of the same. FIG. 4 is a perspective view showing the assembly process of the same as above. 1 is a yoke, 2 is an armature, 3 is a bimetal, 4 is a circuit breaking mechanism, 5 and 6 are leg pieces, 7 is a shaft hole, 8 is a rotation axis, 9
is a torsion coil spring, and 10.11 is an engaging part.

Claims (1)

[Scope of utility model registration request] The U-shaped yoke and the armature form a magnetic path surrounding the overcurrent detection bimetal, and when a large current flowing through the bimetal is detected, the armature is attracted and rotated, and the armature drives the circuit breaker mechanism. In a current breaker tripping device, a shaft hole is provided in both leg pieces of a U-shaped yoke, and rotating shafts are integrally protruded from both sides of the armature so that the lengths of both rotating wheels are different. , a coarsely wound torsion coil spring is interposed on the longer rotation shaft, and each rotation shaft is inserted into the shaft hole, and each end is positioned between one leg of the yoke and the armature. A torsion coil spring engaged with the yoke and the armature biases the armature to rotate in a direction away from the yoke, and also biases the armature in the axial direction of the rotation shaft, thereby providing an engaging portion that restricts the rotation angle of the armature. A thermal electromagnetic overcurrent release device installed on the yoke and armature.