JPH0614409Y2 - Electromagnetic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electromagnet device suitable for use as an electromagnetic trip device such as a circuit breaker or an earth leakage breaker.

(Prior Art) Conventionally, as an electromagnet device for tripping an earth leakage circuit breaker, as shown in FIG. 3, a fixed iron core B wound with a coil A is fixed to a yoke C, and an armature D attracted to the fixed iron core B. There is an electromagnet device in which the base end portion of (1) is pivotally supported on the upper end portion of the yoke C by a pin E, and the armature D is biased in a direction away from the fixed iron core B by a torsion coil spring F which is a return spring. Also, notches are provided at both ends of the armature base, a notch for locking is provided at the center of the upper end of the yoke, and the notch of the armature is fitted and locked to the notch for locking of the yoke,
There are electromagnet devices in which the upper end of the tension spring is hooked on the armature and the lower end is hooked on the yoke, such as those described in Japanese Utility Model Publication No. 61-96507 and Japanese Utility Model Publication No. 58-37109.

(Problems to be Solved by the Invention) In the structure shown in FIG. 3, the pin E is inserted through one pivotal support portion of the yoke C and the armature D, the torsion coil spring F, and then through the other pivotal support portion of the armature D and the yoke C. The armature D was assembled, but at this time, the pin E has to be inserted while holding the torsion coil spring F in a bent state, so that the assembly is troublesome, and the torsion coil spring has a manufacturing error and an arm portion at the time of assembly. The deformation of the spring causes a large variation in the spring force, which makes the operation unstable. Further, as the suction operation of the armature D is widened, the gap between the base end of the armature D and the upper end of the yoke C is widened, so that the magnetic efficiency is deteriorated and the increase of the suction force is deteriorated. . Further, Japanese Utility Model Publication No. 61-96507 and Japanese Utility Model Publication No. 5
In the one described in Japanese Patent Laid-Open No. 8-37109, since the tension coil spring is outside the yoke, the electromagnet device becomes large, and the upper end of the tension coil spring is hooked on the armature and the lower end is hooked on the yoke. There was a problem that assembly was troublesome because it had to be done.

The present invention has been made to solve the above-mentioned problems, and can be easily assembled, has a small variation in spring force of the return spring, has stable operation, is small in size, has good magnetic efficiency, and has an armature. The object of the present invention is to provide an electromagnet device in which the suction force is appropriately increased with the suction of.

(Means for Solving Problems) The present invention is to fix a fixed iron core around which a coil is wound to a yoke,
In the electromagnet device in which the base end of the armature sucked by the fixed iron core is pivotally supported by the pin on the upper end of the yoke, and the armature is biased by the return spring in the direction away from the fixed iron core. An end part is formed with an upwardly bent pivotal support part, a spring support part is formed in the approximate center, and a vertical support part is formed at the upper end of the vertical piece of the yoke in the same direction as the horizontal piece. In addition, a spring support is formed approximately in the center of the upper end, and a compression coil spring as a return spring is interposed between the spring receiving part of the armature and the spring supporting part of the yoke, and the armature pivot part and the yoke pivot part are pinned. It is characterized by being pivoted in.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 1 is a yoke bent into a substantially L shape, and a vertical support portion 2 of the yoke 1 is formed with a pivotal support portion 3 bent at the both ends in the same direction as the horizontal pieces, and a spring support is provided substantially at the center. A protrusion 4 which is a portion is formed. Reference numeral 5 denotes a fixed iron core around which a coil 6 is wound, and the fixed iron core 5 is fixed to a horizontal piece 7 of the yoke 1. Reference numeral 8 denotes an armature that has a pivotal support portion 9 that is bent upward at both ends of the base end portion, and a spring bearing portion 10 that is provided with a protrusion in a rectangular cutout at approximately the center. It is pivotally supported on the yoke 1 by a pin 11. 12 is a compression coil spring which is a return spring,
The compression coil spring 12 is interposed between the spring receiving portion 10 of the armature 8 and the spring supporting portion 4 of the yoke 1, and biases the armature 8 away from the fixed iron core 5.

Next, the operation of the electromagnet device according to the present invention will be described. When a current flows through the coil 6, the armature 8 is attracted to the fixed iron core 5 side to operate. At this time, with the operation of the armature 8, the base end of the armature 8 approaches the upper part of the yoke 1 to compress the compression coil spring 12, and when the current flowing in the coil 6 is cut off thereafter, the armature 8 becomes the spring force of the compression coil spring 12. To return.

(Operation) As described above, according to the present invention, the compression coil spring is provided between the spring receiving portion 10 of the armature 8 and the spring supporting portion 4 of the yoke 1.
Since 12 is interposed, the compression coil spring 12 is interposed between the armature 8 and the yoke 1, and the pin 11 is inserted through the pivotal support portions 3 and 9 of the yoke 1 and the armature 8 to facilitate the armature 8.
Can be assembled. Further, since the compression coil spring is used as the return spring, the variation in spring force is small and stable characteristics can be obtained. Further, since the compression coil spring 12 is inside the yoke 1, the compression coil spring 12 can be made small and the armature 8
With this operation, the gap between the base end portion of the armature 8 and the upper portion of the yoke 1 becomes narrower, so that the suction force is favorably increased.

(Effects of the Invention) As described above, according to the present invention, the assembly can be easily performed, the variation of the spring force is small and a stable characteristic can be obtained, and the size is small and the suction force of the armature is favorably increased. There is an effect that an electromagnet device can be provided.

[Brief description of drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 is a partially cutaway side view, and FIG. 2 is a partially cutaway plan view. FIG. 3 is a side view showing a conventional example. 1 ... Yoke, 4 ... Spring support, 8 ... Armatia,
10 …… Spring receiving part, 12 …… Compression coil spring

Claims (1)

[Scope of utility model registration request] 1. A fixed iron core 5 around which a coil 6 is wound is fixed to a yoke 1, and a base end portion of an armature 8 sucked by the fixed iron core 5 is pivotally supported on an upper end portion of the yoke 1 by a pin 11. In the electromagnet device in which the armature 8 is biased by the return spring 12 in the direction away from the fixed iron core 5, the base end portions of the armature 8 which are bent upward are formed, and the armature 8 is substantially centered. A spring receiving portion 10 is formed on the upper end of the vertical piece 2 of the yoke 1, a pivotal support portion 3 bent in the same direction as the horizontal piece is formed, and a spring support portion 4 is formed substantially in the center of the upper end portion. A compression coil spring 12 as a return spring is interposed between a spring receiving portion 10 of the armature 8 and a spring supporting portion 4 of the yoke 1, and a pivotal support portion 9 of the armature 8 and a pivotal support portion 3 of the yoke 1 are pivotally supported by a pin 11. An electromagnet device characterized in that