JPH0343684Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a plunger-type DC electromagnet device used in electromagnetic actuators and the like.

Generally, a plunger-type DC electromagnet device, which is durable and easy to manufacture, is used for electromagnetic actuators such as shinobi disconnectors. The structure of this type of conventional electromagnet mainly consisting of a yoke is shown in FIGS. 1A and 1B and 2A and 2B. In FIGS. 1A and 1B, the side yoke 1, the lower yoke 2, and the upper yoke 3 are each made of rectangular flat steel plates, and the upper and lower yokes 2 and 3 are fitted with mounting holes provided at their corners. A fixed iron core 6 is attached to the lower yoke 2 at the axis of the electromagnetic coil 5, and a fixed iron core 6 is attached to the lower yoke 2. A plunger 7 corresponding to 6 is inserted through a hole on the upper yoke 3 side.

When the electromagnetic coil 5 is energized, the plunger 7
It is attracted by the fixed iron core 6 and returns to its original state by a return spring (not shown) when the current is cut off. The force attracted by the fixed core at this time is used as the operating force.

In such a configuration, a screw hole for the bolt 4 must be provided in the end face of the side yoke 1, which requires a large number of man-hours. Moreover, the side yoke 1 may have to be made thicker than necessary in order to withstand the strength of the screw hole, and in this case, the material cost increases.
Also, both end surfaces of the side yoke 1 are
In order to avoid creating a gap in the magnetic circuit between the upper and lower yokes 2 and 3, it is necessary to increase the accuracy of the perpendicularity to the side surface, the parallelism of both end surfaces, and the perpendicularity of the screw hole to the end surface. In Fig. 2 A and B, the side yoke 1 and the upper yoke 3 are integrated by bending a steel plate into a U-shape, and the lower yoke 2, electromagnetic coil 5, fixed iron core 6, plunger 7, etc. are the same as in Fig. 1. This is an electromagnetic device assembled similarly to the one shown. In this case, although the troublesome processing required to connect the side yoke 1 and the upper yoke 3 is reduced, it is still not sufficient.

The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a plunger-type electromagnet device that is easy to process and assemble, is durable, and is inexpensive.

This object includes an electromagnetic coil, a cylindrical side yoke surrounding the electromagnetic coil, an upper yoke and a lower yoke attached to both end faces of the side yoke so as to sandwich the side yoke, and the upper yoke and This is achieved by an electromagnetic device characterized in that the lower yoke is coupled to the side yoke by a coupling bolt passed through the inner side of the side yoke. Note that the cross section of the cylindrical side yoke is circular or polygonal, and if the side yoke has a circular cross section, three connecting bolts placed at the vertices of an approximately equilateral triangle will allow the side yoke to have a polygonal cross section. are preferably connected by connecting bolts placed at their vertices depending on the number of angles.

Next, the present invention will be explained in detail based on the drawings according to embodiments. In FIGS. 3A and 3B, the side yoke 1 is a cylindrical steel pipe cut into rings with both end surfaces finished, and an electromagnetic coil 5 is inserted inside the side yoke 1. The lower yoke 2 and the upper yoke 3 are connected by connecting bolts 4 which are arranged closely inside the side yoke 1 and at the vertices of a substantially equilateral triangle. A fixed iron core 6 is attached to the lower yoke 2 at the axis of the electromagnetic coil 5, and a plunger 7 corresponding to the fixed iron core 6 is inserted through a hole on the upper yoke 3 side.

The operation of this electromagnetic device is the same as that of the conventional one, so a description thereof will be omitted.

Although it is necessary to finish both end faces of the side yoke parallel to each other, this is relatively easy since it is molded in one piece. Further, since the connecting bolts are arranged closely inside the side yokes at the vertices of the substantially equilateral triangle, the relative positions of the side yokes and both the upper and lower yokes can be easily determined. In addition, there is no need to provide screw holes for mounting both the upper and lower yokes on the side yoke, which not only reduces man-hours, but the thickness of the side yoke is determined solely by the attraction force of the electromagnetic device, regardless of the thickness of the tightening bolt. It can be done at a low cost overall. Furthermore, since the electromagnetic coil is completely surrounded by a yoke, it will not be damaged from the outside, and since the side yokes are integrated, it is durable.

In FIGS. 4A and 4B, the side yoke 1 is formed of a cylindrical steel material with an approximately square cross section.
Since it is the same as that shown in FIGS. 3A and 3B except that the connecting bolts 4 are arranged at each of the four corners of a substantially square shape, the details will be omitted. The side yoke can also be formed of a cylindrical steel material having a polygonal cross section of pentagon or more. In this case, the connecting bolts do not need to be placed at all vertices of the polygon, as long as there is no misalignment between the side yokes and both the upper and lower yokes, and the tightening pressure of the connecting bolts is evenly applied to the side yokes. It can be reduced as appropriate depending on the number of polygons.

As mentioned above, the plunger-type electromagnet device according to the present invention has a yoke portion consisting of a cylindrical side yoke and both upper and lower yokes on a flat plate, and is easy to work with because there is no need for thread cutting, and it is durable, inexpensive, and durable. Excellent as a large electromagnetic device for operating devices such as disconnectors.

[Brief explanation of the drawing]

Figures 1A and B and Figures 2A and B respectively show examples of conventional plunger-type electromagnet devices, in which A is a plan view, B is a front view, Figures 3A and B, and Figure 4A. , B respectively show examples of the electromagnet device according to the present invention, and in each case, A is a plan sectional view of B along the line XX, and B is a front view. 1...Side yoke, 2...Lower yoke, 3...
...Upper yoke, 4...Coupling bolt, 5...Electromagnetic coil.

Claims (1)

[Claims for Utility Model Registration] 1. An electromagnetic coil, a cylindrical side yoke surrounding the electromagnetic coil, and an upper yoke and a lower yoke attached to both end surfaces of the side yoke so as to sandwich the side yoke. An electromagnet device comprising: an electromagnetic device, wherein the upper yoke and the lower yoke are coupled by a coupling bolt closely penetrating inside a side yoke. 2. In the electromagnetic device according to claim 1 of the utility model registration claim, the cross section of the cylindrical side yoke is circular or polygonal, and when the cross section of the side yoke is circular, the electromagnet device is arranged at the apex of an approximately equilateral triangle. An electromagnetic device characterized in that the side yokes are connected by connecting bolts arranged at vertices according to the number of angles when the side yoke has a polygonal cross section.