JPS646525B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a superconducting device,
More specifically, the present invention relates to a superconducting device with a removable current supply lead for a superconducting magnet.

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2. In the figure, current supply lead 1
consists of a pair of positive and negative conductors 2 in the form of elongated hollow tubes, and a terminal 3 for connecting a cable from an external power supply is connected to the upper end of the conductor 2, and the conductor 2 is attached to and detached from the upper lid 5 of the cryostat 11. It is fastened to an insulating flange 4 which is reliably mounted. A cooling gas inlet 6a is provided at the lower part of the conductor 2, and this cooling gas flows out from an outlet 6b at the upper end of the conductor 2. A contact 7 for transmitting current is formed at the lower end of the conductor 2, and the contact 7 fits into a contact socket 8 fixed to an insulating plate 9 to establish an electrical connection. A connecting wire 10 is coupled to the contact socket 8 . A neck tube 12 is formed in the cryostat 11, and a superconducting magnet 14 is immersed in liquid helium 13 stored at the bottom.

With the above configuration, the superconducting magnet 14 housed in the cryostat 11 is cooled to an extremely low temperature by the liquid helium 13 and becomes superconducting, and is connected to the external power supply ( (not shown).

Generally, superconducting magnet 14 is operated with a large current of several hundred amperes or more to generate a strong magnetic field. Therefore, in the current supply lead 1, the conductor 2 is made of a material with low electrical resistance, such as copper or aluminum, so as to withstand this large current. In response to the heat generated by the conductor 2 when energized, the evaporated gas of liquid helium 13 is introduced from the inlet 6a to cool the conductor 2.

Furthermore, once the rated current is applied to the superconducting magnet 14, by closing a short-circuit switch (not shown) installed inside the superconducting magnet 14, a circulating current flows inside and the rated current of the superconducting magnet 14 is maintained. This makes it possible to disconnect the external power supply. At this time, by disconnecting the external power supply and separating the current supply lead 1 from the cryostat 11, the heat conducted through the conductor 2 is eliminated and the amount of evaporation of the liquid helium 13 is suppressed. That is, if the mounting bolts of the insulating flange 4 are loosened so that the insulating flange 4 can be removed from the upper lid 5, and the current supply lead 1 is pulled out upward, it will be removed from the contact 7 and the contact socket 8. The current supply lead 1 can be removed from the cryostat 11.

Next, when changing the current value of the superconducting magnet 14 or extinguishing it, the current supply lead 1 is inserted again from the top of the cryostat 11, and the contact 7 is completely fitted into the contact socket 8. Afterwards, it must be connected to an external power source.

Here, since the same current flows through the pair of left and right conductors 2, their lengths and diameters are the same, so the contact 7 and the contact socket 8 are spatially on the same level. It is located in

Since the conventional superconducting device is constructed as described above, when the current supply lead 1 that has been detached from the cryostat 11 is reinserted into the cryostat 11, the contact 7 at the tip of the conductor 2 is connected to the lower part of the neck tube 12. There was a drawback that it was difficult to fit the contact into the contact socket 8 located at the contact hole 8.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional devices, and its main object is to provide a superconducting device in which a current supply lead can be easily inserted into a cryostat.

Another object of the present invention is to provide a guide pin and a pin through hole for guiding the contacts at the tips of a pair of conductors constituting the current supply lead to the contact socket when the current supply lead is inserted into the cryostat. An object of the present invention is to provide a superconducting device equipped with a guiding means.

Hereinafter, one embodiment of the present invention shown in FIGS. 3 and 4 will be described. Figure 3 shows the current supply lead 1A being inserted into the cryostat.
FIG. 4 shows a state in which the current supply lead 1A has been inserted into the cryostat and the connection has been completed.

In the figure, a pair of positive and negative conductors 2a and 2b, each having terminals 3a and 3b at the upper end and contacts 7a and 7b at the lower end, are fixed in parallel to an insulating flange 4 so as to maintain insulation from each other. There is.
Contact sockets 8a and 8b into which the contacts 7a and 7b are removably fitted are fixed to an insulating plate 9, and the connection wires 1
0 is connected. 15 is a guide pin;
It is composed of a pin member 15a extending below the contacts 7a, 7b in parallel with the conductors 2a, 2b, and a support member 15b fixed to the conductors 2a, 2b and integral with the pin member 15a. Insulating plate 9
A pin through hole 16 into which the pin member 15a penetrates is bored.

With the above configuration, when the current supply lead 1A that has been detached from the cryostat is re-inserted into the cryostat, the guide pin 15 is first inserted.
As shown in FIG. 3, the pin member 15a engages in the pin through hole 16, and then, by its guiding function, the contacts 7a and 7b are fitted into the contact sockets 8a and 8b, respectively. The state shown in FIG. 4 is reached.
That is, due to the engagement between the guide pin 15 and the pin through hole 16, the contacts 7a and 7b are inserted into the contact socket 8.
Since they are necessarily placed directly above each of a and 8b, mutual fitting and coupling can be achieved extremely easily.

In the above embodiment, the guide pins 15 are attached to the conductors 2a and 2b, but they may also be provided upright on the cryostot side, for example, on the insulating plate 9, and the pin through holes may be provided on the conductors 2a and 2b. , a similar effect can be obtained.

As described above, the present invention has the effect of facilitating and ensuring the insertion operation of the current supply lead by using the guide means that contributes to the insertion of the current supply lead into the cryostat.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a conventional current supply lead, Fig. 2 is a longitudinal cross-sectional view of a superconducting device, and Figs. 3 and 4 are longitudinal cross-sections of essential parts of an embodiment of the present invention, including its operating mode. It is a front view. 1A...Current supply lead, 2a, 2b...Conductor, 3a, 3b...Terminal, 4...Insulating flange,
5... Upper lid, 7a, 7b... Contact, 8a,
8b...Contact socket, 9...Insulating plate, 11...Cryostat, 13...Liquid helium, 14...
...Superconducting magnet, 15...Guide pin, 15
a...Pin member, 15b...Supporting member, 16...
Pin through hole. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. 1 electrically insulated from each other and mechanically coupled in parallel.
In a superconducting device equipped with a removable current supply lead having a pair of tubular conductors, the contact receiver includes a guide pin and a pin through hole through which the guide pin passes, and into which the contact at the lower end of the conductor is fitted. A superconducting device characterized by comprising a guide means for guiding the device to the mouth. 2. The superconducting device according to claim 1, wherein the guide pin is attached to the pair of conductors. 3. The superconducting device according to claim 1, wherein the pin through hole is provided on the side of the pair of conductors. 4. The superconducting device according to claim 2, wherein the guide pin comprises a support member fixed to a pair of conductors and a pin member integrated with the support member and extending below the contact.