JP2922934B2 - Superconducting wire joining method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for joining superconducting members applicable to a power storage device, an electromagnetic propulsion ship, a nuclear fusion device, and the like using superconductivity.

[Prior Art] Conventionally, superconducting wires are rarely joined together and used as a single continuous wire.

Also, in the case of joining, the superconducting wires are merely overlapped and soldered, and there is no structure for joining simultaneously including a high strength material and a low electric resistance material.

[Problems to be Solved by the Invention] (1) When an electric current is applied to the superconducting wire 4, a strong electromagnetic force is generated.

(2) Also, if any disturbance such as frictional heating occurs during energization, the superconducting wire causes a so-called quenching phenomenon in which superconductivity is not superconducting, and further heat is generated. The resistance material 3 needs to be joined adjacent to the superconducting wire.

There has been no method of joining these three members simultaneously.

An object of the present invention is to provide a joining method for joining these members.

[Means for Solving the Problems] The method for joining a superconducting wire according to the present invention comprises the following steps: (A) a superconducting wire, a low electric resistance material adjacent to the superconducting wire, the superconducting wire and the low electric resistance. Forming a pair of members made of a high-strength material surrounding the material, and (B) forming a pair of superconducting wires, a low-resistance material, and a high-strength material between one member and the other member of the pair of members. (C) Next, the outermost part of the above-mentioned member is sandwiched by a reinforcing plate, and after fixing the three members of one member and the other member and the reinforcing plate with bolts, the whole is heated. And joining by pouring the solder into the gap.

Note that the term “overlap” means that the first member and the second member are overlapped so that a joint surface for connection between the first member and the second member is a surface in the longitudinal direction of the first member and the second member. "Lap joining" does not include butt joining.

[Operation] Since a superconducting wire is a substance having an electric resistance of 0 at a very low temperature, it is desirable that the junction thereof has the same performance.

However, if any disturbance such as frictional heating occurs inside the superconducting wire, the temperature of the superconducting wire locally rises, the superconducting state is broken, the state becomes a normal conducting state, and further heat is generated.

In order to prevent this, a low electric resistance material is provided at a portion in contact with the superconducting wire so that a bypass current flows.

In order for this bypass current to flow smoothly, the low electrical resistance materials must be uniformly joined together and have the same performance, so that the superconducting current or bypass current can be reduced by the joining method described above. Make it flow smoothly.

Also, high strength materials are similarly overlapped and soldered, but this alone may result in insufficient strength of the joint.

Therefore, a high-strength backing plate is arranged on the outermost periphery to reinforce this, and this is soldered at the same time. At the same time, the high-strength material and the high-strength backing plate are joined by bolts, thereby strengthening the joint. And a structure that can withstand a strong electromagnetic force when energized.

Embodiment An embodiment of the present invention is shown in FIG. 1 to FIG.

1 is a configuration diagram of a member joint according to an embodiment of the present invention, FIG. 2 is a perspective view of a member joint according to an embodiment of the present invention, and FIG. 3 is a member joint according to an embodiment of the present invention. FIG. 4 is a sectional view taken along line AA of FIG. 3 according to the embodiment of the present invention, and FIG. 5 is a sectional view of each member before joining according to the embodiment of the present invention.

FIG. 1 shows a state in which the first member 1 including the superconducting wire and the second member 5 including the other superconducting wire are joined.

As shown in FIG. 3 to FIG. 5, the first member 1 is composed of a superconducting wire 4, a body electric resistance material 3 adjacent to the superconducting wire, and a high-strength material 2 surrounding them. The second member 5 includes a superconducting wire 8, a low electric resistance material 7 adjacent to the superconducting wire, and a high-strength material 6 surrounding these.

In joining such members, as shown in FIG. 5, the surface including the superconducting wire 4, the low electric resistance material 3, and the high strength material 2 of the first member 1 is exposed by machining in advance and joined. In addition to the surface, the surface of the second member 5 including the superconducting wire 8, the low electric resistance material 7, and the high strength material 6 is exposed in advance by machining or the like to form a bonding surface.

When the joining surfaces of the first member 1 and the second member 5 are overlapped with each other, as shown in FIG. 4, the superconducting wires, the low-resistance materials, and the high-strength materials are adjacent to each other at the joining surfaces. become.

In such a state, the reinforcing patch 9 is further arranged on the outermost periphery, and the first member 1, the second member 5, and the reinforcing patch 9 are fixed by the holding bolt 10.

 The fixed state is shown in FIG.

When the solder 11 is poured and the gap is filled while heating the state of FIG. 2 with a burner iron or the like, the result is as shown in FIG. 3, and the joining method of the present invention is completed.

FIG. 3 is a view of the completed joined body viewed from above, and FIG. 4 shows a cross section taken along line AA of FIG.

In FIG. 4, the gap between the first member 1, the second member 5, and the reinforcing plate 9 is filled with the solder 11, and through the joint surfaces of the first member 1 and the second member 5, The current flows smoothly from the first member 1 to the second member 5, and the three members are integrated in terms of strength.

The method of the present invention comprises the following: the superconducting wires (4 and 8) of the first member 1 and the second member 5; the low electric resistance materials (3 and 7); After processing so as to be joined by the superposed member and superimposing, soldering is performed between the superconducting wires of the first member 1 and the second member 5, the low electric resistance material, and the high strength material. Thus, the electric current flows smoothly from the first member 1 to the second member 5 through the respective joint surfaces of the first member 1 and the second member 5.

That is, the two superconducting wires (4 and 8), the low-resistance material (3 and 7) and the high-strength material (2 and 6)
After overlapping as shown in the figure, the first member 1 and the second
As shown in FIG. 4, the superconducting wire of the member 5, the low electric resistance material, and the high strength material are soldered as shown in FIG. 4, so that the first member and the second member are one long one. It is the same as the member.

In addition, since joining is performed by soldering and there is a possibility that strength may be insufficient, as shown in FIGS. 3 and 4, a high-strength reinforcing patch 9 is provided on the outermost periphery in order to reinforce this. And, at the same time, it is soldered and connected to the high-strength material to be joined with the bolt 10.

[Effects of the Invention] The present invention is configured as described above, and has the following effects.

(1) The superconducting wire of the first member and the superconducting wire of the second member are
As shown in FIG. 4, it became possible to join in a state surrounded by a high strength material and a low electric resistance material.

(2) In the joined state, the superconducting wires and the low electrical resistance material of the two members of the first member and the second member are adjacent to each other as shown in FIG. Electrically connected, there is electrical continuity.

Therefore, the superconducting current flows smoothly through the superconducting wire, and even when a quench occurs, the bypass current flows smoothly through the low electric resistance material.

(3) In the joined state, the two high-strength members of the first member and the second member are joined to each other by soldering adjacent to each other, and the high-strength reinforcing contact plate is fixed with a holding bolt. Since it is soldered, it can withstand the strong electromagnetic force generated at the time of energization, and does not deform or break the joint.

[Brief description of the drawings]

1 is a configuration diagram of a member joint according to an embodiment of the present invention, FIG. 2 is a perspective view of a member joint according to an embodiment of the present invention, and FIG. 3 is a member joint according to an embodiment of the present invention. FIG. 4 is a sectional view taken along line AA of FIG. 3 according to the embodiment of the present invention, and FIG. 5 is a sectional view of each member before joining according to the embodiment of the present invention. (Explanation of symbols) 1... First member, 2, 6... High strength material, 3, 7... Low electric resistance material, 4, 8... Superconducting wire, 5.
… Reinforcing plate, 10… Presser bolt, 11… Solder.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Fujiwara 2-1-1, Shinhama, Arai-machi, Takasago-shi, Hyogo In-house Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. No. 1 Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Kazura Hayakawa 1-1-1, Wadazakicho, Hyogo-ku, Kobe, Hyogo Prefecture Inside Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (72) Inventor Toshihide Nakano Kobe, Hyogo Prefecture 1-1-1, Wadazakicho, Hyogo-ku, Mitsubishi-shi, Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. -74983 (JP, A) JP-A-58-35906 (JP, A) JP-A-2-50403 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01R 4/68 H01R 43/00 H01R 4 3/02 H01B 12/00-12/16 H01B 13/00 561-565

Claims (1)

(57) [Claims] (A) A pair of members comprising a superconducting wire, a low electric resistance material adjacent to the superconducting wire, and a high strength material surrounding the superconducting wire and the low electric resistance material are formed. (B) superconducting wires, low electrical resistance materials, and high strength materials of one member and the other member of the pair of members are superimposed on each other; (C) Next, the outermost members are reinforced. It is characterized in that it is clamped by a backing plate, and after fixing the three members of one member and the other member and the reinforcing backing plate with a bolt, the whole is heated and joined by pouring solder into a gap. Superconducting wire joining method.