JPS6225847Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric conductor, and particularly to an electric conductor that is used at high voltage and large current, such as a coil for a nuclear fusion device, and is composed of a solid conductor and a hollow conductor.

In general, the multi-layered coils used in nuclear fusion devices, especially torus-type nuclear fusion devices, require a large current to be passed through them to generate a strong magnetic field. In addition, due to the limit temperature of the coil insulation,
The heat loss due to the current must be removed by cooling the coil conductor.

For this reason, a solid conductor with a large cross section is usually used as a coil conductor, and a groove, etc., for the cooling conductor passage is provided in this conductor, and a separately manufactured hollow conductor is glued to the groove, etc., to form an integrated structure. to form a large cross-section directly cooled coil conductor.

The prior art will be explained below based on the illustrated example. FIG. 1 shows an example of connection in the case where it becomes necessary to finally connect the solid conductor 1 and the hollow conductor 2 at the same location due to requirements for disassembling or assembling the coil.
As shown in the figure, adjacent solid conductors 1 are copper welded 5
etc., and the hollow conductors 2 are separated from each other above the solid conductor 1 in front of the connection position in order to secure a connection space, and in this state, they are brazed with silver solder 7 through the conductor sleeve 6. Ru.
However, this connection has the drawback that the hollow conductor 2 protrudes outward in the vicinity of the connecting portion, which obstructs adjacent equipment and assembly, and creates a portion that cannot be cooled. Note that 3 is an insulating layer that covers the periphery of the conductor.

In order to eliminate the above-mentioned drawbacks, Fig. 2 shows that the solid conductors 1 are notched in advance near their connection points, and the hollow conductors 2 are brazed together at this notch 4 with silver solder 7 through a conductor sleeve 6. It is something that is integrated. Of course, the solid conductors 1 are connected to each other by copper welding 5 or the like.

However, in the conventional case shown in Figure 2,
Similar to the base material, a large mechanical stress is generated at the connection between the hollow conductor 2 and the conductor sleeve 6, so this connection cannot be made using a low melting point, low strength material such as solder. At the same time, the temperature during brazing is higher than the recrystallization temperature of the copper material, which causes softening, so in order to prevent the solid conductor 1 and the copper weld 5 from softening during brazing, the hollow conductor 2 is attached to the solid conductor 1. A notch 4 is provided to secure a space for heating the connection, but this notch 4 reduces the mechanical strength of the solid conductor 1 and further reduces the current density in this part. As a result, direct cooling is no longer possible, and therefore the temperature of the connection portion increases during energization, resulting in thermal deterioration of the insulating layer 3.

The present invention was developed in view of the above points, and its purpose is to improve the mechanical strength of the conductor connection even when solid conductors and hollow conductors are connected at the same location. An object of the present invention is to provide an electric conductor that does not cause a decrease in temperature, increases the cooling effect, suppresses temperature rise, and prevents deterioration of an insulating layer.

In the present invention, a connecting conductor having a cooling medium passage is placed in a notch cut out near the hollow conductor at the solid conductor connecting part so as to span both conductors, so that the cooling medium passage of the connecting conductor is electrically connected to the hollow conductors. In addition to providing
The intended purpose is achieved by welding and connecting the connecting conductor, solid conductor, and hollow conductor, respectively.

Hereinafter, the present invention will be explained based on the embodiments shown in the drawings. Incidentally, the same reference numerals are used for the same parts as in the past.

An embodiment of the present invention is shown in FIGS. 3 and 4.

As shown in the figure, in this embodiment as well, adjacent solid conductors 1
They are connected by copper welding at 5 parts, and the hollow conductor 2 is fixedly bonded to the cooling groove of each solid conductor 1 by soldering. In this embodiment, the solid conductor 1
A notch is provided in the vicinity of the hollow conductor 2 at the connecting portion of the comrades so as to straddle both of the conductors, and after the solid conductors 1 are fixed by welding, the connecting conductor 10 having the cooling medium passage 9 is connected to the solid conductor. 1, i.e., in the notch, to conduct the hollow conductor 2 and the cooling medium passage 9,
This connecting conductor 10, solid conductor 1, and hollow conductor 2 are connected by copper welding 5a, respectively.

According to this embodiment, an increase in current density caused by providing a notch as in the conventional case and an increase in temperature at the five copper welds due to an increase in the length of the non-coolable part can be avoided. Since the heat is transferred to the cooling medium passing through the cooling medium passage 9 provided in the connecting conductor 10 and removed, the temperature rise is suppressed and the insulating layer 3 does not deteriorate thermally. Furthermore, since the connecting conductor 10 is placed in the notch, there is an effect of suppressing a decrease in mechanical strength.

According to the electrical conductor of the present invention described above, the connecting conductor having the cooling medium passage is inserted into the notch that is cut out in the vicinity of the hollow conductor at the solid conductor connecting part and spanning both conductors. is provided so that the hollow conductors are electrically connected to each other, and the connecting conductor, the hollow conductor, and the solid conductor are respectively welded and connected, so the solid conductor and the hollow conductor are connected at the same place. However, it is very effective for such heavy electrical conductors because it does not reduce the mechanical strength of the conductor connection portion, enhances the cooling effect, suppresses temperature rise, and does not cause deterioration of the insulating layer.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing the connecting portion of a conventional electric conductor, FIG. 3 is a cross-sectional view showing the connecting portion of an electric conductor according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view showing the connecting portion of a conventional electric conductor. - It is a cross-sectional view. 1... Solid conductor, 2... Hollow conductor, 3... Insulating layer, 4... Notch, 5, 5a... Copper welding, 6...
...Conductor sleeve, 7...Silver solder, 9...Cooling medium passage, 10...Connecting conductor.

Claims (1)

[Scope of utility model registration request] At least two conductors in which a solid conductor and a hollow conductor are integrated and the periphery thereof is covered with an insulating layer,
In an electric conductor in which the hollow conductors are welded and connected so that the hollow conductors of the adjacent conductors are electrically connected, a notch cut out in the vicinity of the hollow conductor of the solid conductor connection part straddles both conductors, A connecting conductor having a cooling medium passage is provided so that the cooling medium passage of the connecting conductor is electrically connected to the hollow conductors, and the connecting conductor, the solid conductor, and the hollow conductor are connected by welding, respectively. An electrical conductor characterized by: