JPS594412Y2 - Drive coil device for arc rotating type breaker - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a drive coil device for an arc rotating type breaker, and its purpose is to create a drive coil device that is simple in structure, small in size, and easy to manufacture, and can withstand the strong electromagnetic force generated by short-circuit current. It is on offer.

An arc rotating type breaker uses a magnetic field generated by commutating a cutting current in a drive coil device installed in a breaker to rotationally drive an arc and extinguish the arc.

Therefore, the drive coil device used here is required to be strong enough to withstand strong electromagnetic force, to have excellent thermal shock resistance and mechanical shock resistance, and to have a simple structure and small size.

In contrast, conventionally, a structure as shown in FIG. 1 or 2 has been adopted.

That is, in an arc rotating type breaker that rotates and extinguishes an arc generated between a fixed arc contact/arc runner 1 and a movable arc contact 2 by the magnetic field of a drive coil device 3, the drive coil device 3 is a coil element wire. 3-1 is cast with a suitable insulating material 3-2 to serve both as insulation and reinforcement.

In addition, 4 is a fixed main contact, 5 is a movable main contact, and 6 is SF.
6 is a sealed container filled with insulating arc-extinguishing gas such as gas, 7 is a bellows, 8 is a coil stand, and 9 is a movable rod.

However, in the drive coil device 3 described above, when the coil wire 3-1 wound into a spring shape is molded with the casting resin 3-2, the pitch l between the layers of the wire 3-1 often becomes irregular. As a result, the magnetic field becomes non-uniform, and in order to obtain sufficient strength, the casting resin layer must be made thicker, making the drive coil device 3 larger.

Furthermore, cracks appear in the casting resin 3-2 due to repeated heating and cooling caused by the shutoff.

Furthermore, it has drawbacks such as being difficult to manufacture. This proposal was devised in view of the following points, and will be explained below based on FIGS. 3 to 4.

FIG. 3 is a longitudinal cross-sectional view of an arc rotating breaker using the drive coil device of the present invention, in which insulating plates 11 and coil elements 12 are alternately arranged on a coil stand 8, and a fixed contact 1 is placed at the tip. This drive coil device is constructed by arranging these and bonding their entire contact surfaces to each other.

The same reference numerals as in FIG. 1 indicate the same or corresponding parts.

FIG. 4 is an exploded perspective view of the coil device 10.

In the same figure, 11 is a donut-shaped insulating plate made of, for example, ceramic porcelain, epoxy, Bakelite, Teflon, etc., and has a connecting piece insertion hole 11-1;
2-1 and two connection insertion holes 12- on both sides of this cut groove.
It is a donut-shaped disk-shaped coil element having 2.

This can be easily obtained by pressing a thin copper plate.

Reference numeral 13 denotes a connecting piece for electrically connecting the adjacent coil elements 12.12, which can be easily obtained by pressing a copper plate so that it can be fitted into the hole 12-2.

The contact piece 13 has a thickness equal to the total of three pieces, two coil elements 12 and one insulating plate 11.
This has the role of electrically connecting two adjacent coil elements 12, 12 via the insulating plate 11 and positioning them.

1 is a fixed contact and an arc liner. If groove 1-1 is provided, it becomes a one-turn coil element, and if it is not provided, it becomes a short-circuit ring, which can create a phase difference between the breaking current and the generated magnetic field. .

Next, a method of assembling the one shown in FIG. 4 will be explained.

A plurality of coil elements 12, 12... are placed on the coil stand 8.
. . 12 are stacked one after another, and an insulating plate 11 is sandwiched between each one in a sandwich-like manner.

At this time, one end of the connecting piece 13 inserted into the hole 11-1 of the insulating plate 11 contacts one surface of the coil element 12, and the other end contacts the coil element 12, which contacts the other surface. The holes 12-1 are inserted into the other holes 12-1 of the holes 12-1, respectively.

Therefore, the insulating plate 11. The coil elements 12 are positioned and electrically connected to each other.

Finally, stack the fixed contact 1.

After the shape is completed, the process of assembling the drive coil device is completed by using adhesive.

The adhesive used is one that can bond the insulator and the conductor, has high impact resistance, and preferably has relatively high heat resistance.

An example is an epoxy resin adhesive.

If there is a problem in terms of strength when assembling using the adhesive, the following adhesive may be used.

That is, the insulating plate 11 is made of porcelain that exhibits corrosion resistance against decomposition products of SF6 gas (for example, alumina porcelain), or porcelain containing silicon with a protective coating formed on its surface.

A metallization process is applied to the diagonally shaded portion 11-2 on the surface of this ceramic insulating plate 11 to form a metal thin film on the surface.

Of course, this metallization treatment is applied to both the front and back surfaces of the insulating plate 11.

Next, this metallized surface 11-2 and the surface of the coil element 12 are brazed.

This brazing is performed by stacking the required number of coil elements 12, metallized insulating plates 11, and fixed contacts 1 and then brazing them together to obtain a drive coil device that is both easy to work with and strong. becomes possible.

Note that the dotted line in the figure indicates the path of the current i.

As described above, the present invention involves bonding the entire contact surface between the donut-shaped disk-shaped coil element having a cut groove and an insulator with adhesive, and using a connecting piece and a hole into which it is inserted on both sides of the cut groove to create a coil. It consists of mutual electrical connection and positioning of elements.

Therefore, since a drive coil device can be obtained by stacking a plurality of donut-shaped disk-shaped coil elements, the coil element can be easily manufactured by pressing, etc., and the number of turns can be changed by changing only the number of coil elements. Even if the number of turns is increased, the outer diameter does not increase and the size can be reduced.

Moreover, it can be made compact without requiring any fastening parts, and can withstand electromagnetic repulsion and thermal and mechanical impact forces due to the strength of the coil element and insulating plate.

Electrical connection and positioning between adjacent coil elements becomes extremely easy.

Furthermore, it is also possible to form it in one bonding operation if necessary.

As a result of the above, it is possible to obtain a strong arc rotation type drive coil device with a simple structure.

During assembly, the insulating plate is supported by the connecting pieces inserted into the holes, so there is no risk of the coil elements falling off.

In addition, the coil element has holes on both sides of the kerf, and a practical effect is that a right-handed or left-handed coil device can be freely obtained depending on which of the connecting pieces inserted therein protrudes upward. play.

[Brief explanation of the drawing]

FIGS. 1 and 2 show a conventional device, in which a is a longitudinal sectional view of an arc rotating breaker, and b is a longitudinal sectional view of a coil wire. FIG. 3 is a longitudinal sectional view of an arc rotating type breaker using the device of the present invention, and FIG. 4 is an exploded perspective view showing an example of the device of the present invention. 1...Fixed arc contactor and arc runner, 8
... Coil stand, 10 ... Drive coil device, 11 ... Insulator, 11-1 ... Connection piece insertion hole, 11-2 ... ... Adhesive coated surface, 12
・・・・・・Disc-shaped coil element, 12-1・・・・・・
Cut groove, 122... Connection piece insertion hole, 13...
・Connection piece.

Claims (1)

[Scope of utility model registration request] A plurality of donut-shaped disk-shaped coil elements each having a cut groove are stacked on top of each other with donut-shaped insulating plates interposed therebetween, and this is placed in one of a pair of contacts housed in a sealed container filled with an insulating arc-extinguishing gas. In the device to be attached, connection piece insertion holes are provided on both sides of the cut groove of each of the disk-shaped coil elements, and one connection piece insertion hole is provided on each of the insulating plates, and the connection of each of the insulating plates is provided. One end of the connection piece inserted into the piece insertion hole is inserted into one connection piece insertion hole of each disc-shaped coil element, the other end is inserted into the other connection piece insertion hole of each adjacent disc-shaped coil element, and the Electrical connections are made between the disk-shaped coil element located above on one side of the kerf and with the disk-shaped coil element located below on the other side, and between each of the insulating plates and each disk-shaped coil element. A drive coil device for an arc rotating breaker, characterized in that the coils are bonded together.