JP2007184173A - Terminal part of superconducting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal part of a superconducting apparatus capable of reducing Joule heat generated at the terminal part without reducing reliability against leakage. <P>SOLUTION: The terminal part of the superconducting apparatus, arranged on an outside wall of a container 1 in which a coolant cooling electric devices housed in the container in a superconducting state is filled, connected to outside at the outside of the container and connected to an electric apparatus at the inside, has a terminal rod 21 airtightly penetrating through an outer wall of the container 1; an outside superconducting wire 24 of which one end part is inserted, soldered, and fixed to an outside hole 21a opened toward outside of the terminal rod 21, not penetrating through the terminal rod 21, and soldered and fixed thereto, and the other end part is arranged for connecting it to the outside; and an inside superconducting wire 27 of which one end part part is inserted into, soldered, and fixed to an inside hole 21b opened toward inside of the terminal rod 21, which is not penetrating through the terminal rod 21 nor communicated with the outside hole 21a, and the other end part is arranged for connecting it to an electric apparatus. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a terminal portion of a superconducting device that reduces Joule heat generation without reducing reliability against leakage.

  The terminal part of a conventional superconducting device is made of iron, nickel, and cobalt alloy Kovar with a low coefficient of thermal expansion in the terminal hole formed in a container made of stainless steel and filled with liquid helium as a coolant. The lower end of a tube made of a material is inserted and is airtightly welded to the container. At the upper end of the tube, the lower end of an insulating tube made of a ceramic material and having the same diameter as the tube is overlapped and joined to the tube by brazing. Furthermore, the opening side of the pipe processed into a U-shaped cross section from the Kovar material made of the same material as the pipe is overlapped on the upper end of the insulating pipe and brazed to the insulating pipe. In the through hole machined at the center of the upper end of the tube, a terminal rod formed into a rod shape having a predetermined outer diameter by machining the outer periphery from a pure copper material is inserted and brazed to the tube. The container is housed in an outer container, and a vacuum is applied between the outer container and the container in order to improve heat insulation performance. The upper end of the terminal rod is connected to the lower end of the terminal conductor that airtightly penetrates the outer container, and the lower end of the terminal rod is connected to an electrical device that is cooled with liquid helium injected into the container and energized in a superconducting state. ing. In the terminal portion of the superconducting apparatus configured as described above, the pipe and the insulating pipe and the pipe are brazed to each other, the terminal bar is brazed to the pipe, and then the lower end of the pipe is brazed to the container.

The terminal part of another conventional superconducting device is different in that a pair of superconducting wires are used, whereas a terminal bar is penetrated through the tube. That is, the lower end of an electrode having the same outer diameter as that of the terminal rod and processed from pure copper in a U-shaped cross section is inserted into the through hole formed in the upper center portion of the tube and brazed to the tube. The upper ends of a pair of superconducting wires are symmetrically inserted into the inner periphery of the tube and brazed to the inner periphery of the tube. For superconducting wires, alternating current superconducting wires are used, in which silver and nickel alloys are embedded with fine niobium titanium wires.
Further, in the terminal portion of another conventional superconducting device, the superconducting wire penetrates the terminal portion, and airtightness is ensured by soldering. Superconducting wires wired from the superconducting equipment are soldered to the terminal rod, superconducting wire, and inner electrode, respectively. Superconducting wires wired from external terminals are soldered to terminal bars, electrodes, and outer electrodes, respectively (see, for example, Patent Document 1).

JP-A-8-203575 (FIGS. 4, 5, and 1)

  The conventional superconducting device has a problem that the terminal portion of the superconducting device has a long distance from the superconducting portion to the superconducting portion, and a connection area is reduced to increase Joule heat generation.

  Furthermore, there may be an example in which the superconducting wire itself is penetrated to the outer wall of the container. In that case, in order to ensure reliability against leakage, it is necessary to fix the superconducting wire itself to the outer wall of the container by brazing or welding. There is. However, in the case of a superconducting wire (for example, one with a small thickness) that is restricted by connection with electrical equipment and other parts of the outside, it is difficult to fix by brazing and welding due to its properties. is there. Therefore, soldering is used for fixing in such a case. Then, there exists soldering which penetrates the container, and since the sealing between the refrigerant and the vacuum is performed, the reliability with respect to leakage is reduced in the soldering.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a terminal portion of a superconducting device that can reduce Joule heat generation without reducing reliability against leakage.

  The present invention provides a superconducting device provided on an outer wall of a container into which a refrigerant for cooling an electric device housed therein to a superconducting state is injected, and connected to an external device outside the container and an electric device inside the container, respectively. In the terminal part of the device, one end is inserted into an outer hole that opens outside the terminal bar and does not penetrate the terminal bar, and is fixed by soldering, and the other end that is airtightly penetrated to the outer wall of the container Is connected to the outside with one end inserted into the outer superconducting wire and the inner hole that opens to the inside of the terminal bar and does not penetrate the terminal bar and does not communicate with the outer hole, and the other end is fixed by soldering. It is provided with an inner superconducting wire for connecting to an electric device.

  The terminal portion of the superconducting device according to the present invention is provided on the outer wall of the container into which the refrigerant for cooling the electric device housed in the superconducting state is injected, and is connected to the outside on the outside of the container and the electric device on the inside of the container. In the terminal part of the superconducting device connected to each of the terminals, one end is inserted into the terminal rod that is airtightly penetrated to the outer wall of the container and the outer hole that opens outside the terminal rod and does not penetrate the terminal rod. Since the other end is connected to the outside, one end is inserted into the outer superconducting wire and the inner hole that opens inside the terminal bar and does not penetrate the terminal bar and does not communicate with the outer hole. Since the other end is provided with the inner superconducting wire for connecting to the electric device, Joule heat generation can be reduced without lowering the reliability against leakage.

Embodiment 1 FIG.
Embodiments of the present invention will be described below. 1 is a cross-sectional view showing a configuration of a terminal portion of a superconducting device according to Embodiment 1 of the present invention. In the figure, liquid helium as a refrigerant is injected into the inside and the electric device disposed therein is cooled to a superconducting state, and the terminal portion of the superconducting device is formed in a container 1 made airtight with a stainless steel plate, The container 1 is accommodated in an outer container (not shown), and a vacuum is applied between the outer container and the container 1 in order to improve heat insulation performance. The terminal portion of the superconducting device is inserted into the terminal hole 1a formed at a desired location on the outer wall of the container 1 at one end made of a steel, nickel, cobalt alloy Kovar material having a small thermal expansion coefficient. A first pipe 2 welded so as to be airtight with the container 1, and the other end of the first pipe 2 is made of a ceramic material having the same diameter as that of the first pipe 2. The insulating tube 3 joined to the tube 2 and the other end of the insulating tube 3 are processed into a U-shaped cross section with the same Kovar material as the first tube 2, and the opening side is overlapped with the insulating tube 3. The outer periphery is processed from a pure copper material into the second pipe 4 attached and the through hole 4a machined in the center of the upper end of the second pipe 4 to form a rod having a predetermined outer diameter and penetrate therethrough. And a terminal bar 21 that is brazed to the outer wall of the container 1 in an airtight manner.

  Furthermore, one end of the outer auxiliary electrode 23 made of, for example, a pure copper material is fixedly soldered and inserted into the outer hole 21a that opens to the outside of the terminal bar 21 and does not penetrate the terminal bar 21. 23 is soldered to the outer hole 21a, and the other end is connected to the outside, so that the outer superconducting wire 24 is opened to the inside of the terminal bar 21 and does not pass through the terminal bar 21 and does not communicate with the outer hole 21a. One end of the inner auxiliary electrode 26 made of, for example, pure copper is fixedly inserted into the hole 21b by soldering, the inner auxiliary electrode 26 is soldered to the inner hole 21b, and the other end is connected to an electrical device. An inner superconducting wire 27.

  Next, the operation of the terminal portion of the superconducting device of the first embodiment configured as described above will be described. First, a comparison is made in order to energize the electrical equipment in the container 1 in the terminal portion 1a attached to the terminal hole 1a formed in the container 1 which is filled with liquid helium as a refrigerant and is made of a stainless steel plate in an airtight manner. A large current (5A to 5000A or more) is energized. At this time, since the terminal portion is cooled from the liquid helium through the inner superconducting wire 27, the inner superconducting wire 27 is in a superconducting state. On the other hand, since the terminal rod 21 is made of pure copper, it generates heat when energized. This heat generation is also cooled by the liquid helium in the container 1 through the inner superconducting wire 27. This heat generation affects the consumption of liquid helium. In the case of the terminal of the present invention, it has been confirmed that the amount of heat generated can be suppressed to about 1 W by energization of about 5000 A and about 0.1 W by energization of 500 A.

  The terminal portion of the superconducting device of the first embodiment configured as described above is hermetically fixed to the container only by welding and brazing, and the outer superconducting wire and the inner superconducting wire are in communication with each other. Since there is no soldering that penetrates the terminal part of superconducting equipment because it is inserted into the outer hole and the inner hole that are not soldered and formed through soldering, it is very reliable against leakage and Joule heating Can be reduced. In addition, the outer superconducting wire and the inner superconducting wire are fixed to the outer auxiliary electrode and the inner auxiliary electrode by soldering, and are inserted into the outer hole and the inner hole. Fabrication in connection to the outer and inner superconducting wires is facilitated.

Embodiment 2. FIG.
In the first embodiment, an electric device in a superconducting state on the terminal rod and an inner superconducting wire and an outer superconducting wire connected to the external terminal are inserted into the inner hole and the outer hole via the inner auxiliary electrode and the outer auxiliary electrode. Although an example of fixing is shown, the present invention is not limited to this. For example, as shown in FIG. 2 (however, the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted). An outer hole 21d that is open to the outside of the terminal bar 21 and does not penetrate the terminal bar 21 and that can be soldered by inserting only the outer superconducting wire 24, and the inner side of the terminal bar 21 An inner hole 21c is formed which is open and does not penetrate the terminal rod 21 and does not communicate with the outer hole 21c, and has a size capable of being soldered by inserting only the inner superconducting wire 27. Hole 21c and inner hole 1d by inserting only the outer superconducting wire 24 and the inner superconducting wire 27 is fixedly provided with soldered.

  According to the terminal portion of the superconducting device of the second embodiment configured as described above, the outer superconducting wire and the inner superconducting wire are more limited in size and shape than those of the first embodiment. Although the formation of the hole and the inner hole may be difficult in processing, the number of parts is reduced as compared with the first embodiment, and the configuration and the number of steps are simplified. In other portions, the same effect as in the first embodiment can be obtained. In addition, the configuration of the second embodiment can be adopted as appropriate in the other embodiments as well, and the description thereof is omitted as appropriate.

Embodiment 3 FIG.
In each of the above embodiments, an example has been shown in which the outer superconducting wire and the inner superconducting wire are arranged in the terminal rod in a positional relationship such that they face each other in the positional relationship in the direction from the outer side to the inner side of the terminal rod. For example, as shown in FIG. 3 (however, parts similar to those in the above embodiments are given the same reference numerals and description thereof is omitted), and are opened to the outside of the terminal rod 21. An outer hole 21e that does not penetrate through the terminal rod 21 and an inner hole 21f that opens to the inside of the terminal rod 21 and does not penetrate the terminal rod 21 and that do not communicate with the outer hole 21e; The inner holes 21f are formed such that the positions of the inner holes 21f are opposite to each other in the direction A in the direction A from the outer side to the inner side of the terminal rod 21. The outer auxiliary electrode 28 and the inner auxiliary electrode 29 in which the outer superconducting wire 24 and the inner superconducting wire 27 are fixed by soldering are inserted into the outer holes 21e and the inner holes 21f and fixed by soldering. Therefore, the positional relationship in which the outer superconducting wire 24 and the inner superconducting wire 27 are formed is configured to have an opposing positional relationship in the positional relationship in the direction A from the outside to the inner side of the terminal rod 21.

  According to the terminal portion of the superconducting device of the third embodiment configured as described above, the current path from the outer superconducting wire to the inner superconducting wire is of course the same effect as in the above embodiments. Therefore, compared to the above embodiments, Joule heat generation becomes smaller and the thermal load on the superconducting device becomes smaller. In addition, the configuration of the third embodiment can be adopted as appropriate in the other embodiments as well, and the description thereof is omitted as appropriate.

Embodiment 4 FIG.
In each of the above embodiments, an example in which the outer superconducting wire and the superconducting wire having only the inner superconducting wire are disposed inside the terminal rod is not limited to this. For example, as shown in FIG. The same parts as those of the above-described embodiments are given the same reference numerals, and the description thereof is omitted.) The terminal bar 21 is penetrated through the terminal bar 21 except for the positions where the outer hole 21a and the inner hole 21b are formed. No auxiliary holes 21g, 21h are formed. Here, an example in which auxiliary holes are formed in two places is shown, but the present invention is not limited to this. However, when the number of auxiliary holes increases, an area for forming the auxiliary holes is required, and the size of the terminal bar itself becomes large and handling becomes inconvenient. Then, auxiliary superconducting portions 30 and 31 fixed by soldering are formed in the auxiliary holes 21g and 21h.

  According to the terminal part of the superconducting device of the fourth embodiment configured as described above, the current bypasses the auxiliary superconducting part, as well as the same effects as those of the above-described embodiments. It is possible to further reduce the heat generated by. Thereby, the thermal load with respect to a superconducting apparatus becomes small. In addition, since the auxiliary superconducting portion is not subject to other restrictions, it can be used in a desired shape, and manufacturing is facilitated. Further, the configuration of the fourth embodiment can be adopted as appropriate in the other embodiments as well, and the description thereof is omitted as appropriate.

Embodiment 5 FIG.
In each of the above embodiments, an example in which the outer superconducting wire and the inner superconducting wire are disposed inside the terminal rod has been shown. However, the present invention is not limited to this example. For example, as shown in FIG. The same reference numerals are given to the same parts as those in FIG. 2 and description thereof is omitted.) One end is inserted into the outer hole 21i that opens to the outside of the terminal rod 21 and does not penetrate the terminal rod 21, and is fixed by soldering. An outer superconducting portion 32 formed with the other end exposed to the outside, one end connected to the other end of the outer superconducting portion 32 by soldering, and the other end connected to the outside, a terminal An inner superconducting portion 33 having one end inserted into the inner hole 21j that opens to the inner side of the bar 21 and does not penetrate the terminal bar 21 and does not communicate with the outer hole 21i, is fixed by soldering, and the other end is exposed to the inner side. And one end connected to the other end of the inner superconducting portion 33 Re other end it is made similar to the inner superconducting wire 27 to be connected to the electrical device.

  According to the terminal portion of the superconducting device of the fifth embodiment configured as described above, the same effects as those of the above-described embodiments can be obtained, and the operation is not restricted by other connection points. Insert the outer superconductor and inner superconductor into the terminal bar, solder them to the terminal bar, and the outer superconductor and inner superconductor that are constrained by other connection points. Since the superconducting portion and the inner superconducting portion are fixed by soldering at locations not inserted into the terminal rods, workability is improved. Further, the configuration of the fifth embodiment can be adopted as appropriate in the other embodiments as well, so that the description thereof is omitted as appropriate.

It is a figure which shows the structure of the terminal part of the superconducting apparatus of Embodiment 1 of this invention. It is a figure which shows the structure of the terminal part of the superconducting apparatus of Embodiment 2 of this invention. It is a figure which shows the structure of the terminal part of the superconducting apparatus of Embodiment 3 of this invention. It is a figure which shows the structure of the terminal part of the superconducting apparatus of Embodiment 4 of this invention. It is a figure which shows the structure of the terminal part of the superconducting apparatus of Embodiment 5 of this invention.

Explanation of symbols

1 container, 21 terminal rod, 21a, 21c, 21e, 21i outer hole,
21b, 21d, 21f, 21j inner holes, 21g, 21h auxiliary holes,
23, 28 outer auxiliary electrode, 24 outer superconducting wire, 26, 29 inner auxiliary electrode,
27 inner superconducting wire, 30, 31 auxiliary superconducting part, 32 outer superconducting part,
33 Inner superconducting part.

Claims (5)

A superconducting device provided on the outer wall of a container into which a refrigerant for cooling the electric device housed in the superconducting state is injected, and connected to the outside on the outside of the container and the electric device on the inside of the container In the terminal portion of the container, one end is inserted into a terminal rod that is air-tightly penetrated to the outer wall of the container and an outer hole that opens outside the terminal rod and does not penetrate the terminal rod, and is fixed by soldering. The other end is connected to the outside and soldered by inserting one end into the outer superconducting wire and the inner hole that opens to the inside of the terminal rod and does not penetrate the terminal rod and does not communicate with the outer hole. A terminal portion of a superconducting device, comprising: an inner superconducting wire fixed at the other end and connected to the electric device at the other end. One end of each of the outer superconducting wire and the inner superconducting wire is inserted into the outer hole and the inner hole via an outer auxiliary electrode and an inner auxiliary electrode, respectively, and the outer superconducting wire and the inner superconducting wire are inserted into the outer auxiliary electrode. And the inner auxiliary electrode is fixed by soldering, and the outer auxiliary electrode and the inner auxiliary electrode are formed by being inserted into the outer hole and the inner hole and fixed by soldering. Item 2. The terminal part of the superconducting device according to Item 1. Superconductivity is provided on the outer wall of a container filled with a coolant that cools the electrical equipment housed in the superconducting state, and is connected to the outside on the outside of the container and the electrical equipment on the inside of the container. In the terminal portion of the device, one end is inserted into the terminal rod that is airtightly penetrated to the outer wall of the container and the outer hole that opens outside the terminal rod and does not penetrate the terminal rod, and is fixed by soldering. An outer superconducting part formed with the other end exposed to the outside, an outer superconducting wire for connecting one end to the other end of the outer superconducting part by soldering and the other end connected to the outside, and An inner superconducting portion that opens to the inner side of the terminal rod, does not penetrate the terminal rod, and is inserted into an inner hole that does not communicate with the outer hole and is fixed by soldering, and the other end is exposed to the inner side; , One end to the other end of the inner superconducting part Terminal portion of superconducting apparatus, characterized in that connected the other end with an inner superconducting line connected to said electrical device. The formation position relation of the said outside hole and the said inside hole has a positional relation part which opposes in the positional relation of the direction from the outer side to the inner side of the said terminal rod. The terminal part of the described superconducting equipment. 2. An auxiliary superconducting portion fixed to an auxiliary hole not penetrating through the terminal rod at a place other than a place where the outer hole and the inner hole of the terminal bar are formed. The terminal part of the superconducting apparatus in any one of 4.

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