JPH0817264A - Forced cooling type superconductor - Google Patents

Abstract

PURPOSE:To reduce pressure loss, cool to a downstream part of a cooling passage effectively, and reduce manufacture cost in a forced cooling type superconductor. CONSTITUTION:Plural superconductive wires 1 are twisted around a stabilizing material as a center shaft, all the outer circumferential surfaces of the superconductive wires 1 are skip-wound spirally using an outer circumferential tape 3, and the form of inner surface four corners of a conduit 2 is set to be different from the form of the outer circumferential tape 3 covering the superconductors 1. By combining the superconductors 1 covered with the outer circumferential tape 3 and the conduit 2 with each other, the superconductors 1 are covered spirally along the length, and a cooling channel 4 can thus be formed in which a mass quantity of cooling medium can be supplied to the parts of the four corners of the superconductors 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced cooling type superconducting conductor applied to a large-scale superconducting magnet that needs to generate a high magnetic field, such as a superconducting magnet of a superconducting power storage device.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional superconducting conductor applied to a superconducting magnet in a superconducting power storage device is manufactured by forming a superconducting wire in accordance with the shape of a conduit to form a composite. One having a structure having a structure and one having a double conduit as shown in FIG. 4 are generally used.

The conventional superconducting conductor shown in FIG. 3 has an outer periphery on the outer periphery of the superconducting wire 1 only for the purpose of maintaining the twisted wire shape when the superconducting wire 1 and the conduit 2 are combined and preventing damage to the strands. Tape 3 was wrapped around. For this reason, as described above, the superconducting wire 1 was molded in accordance with the shape of the conduit 2 to form a composite, and no space was created at the four corners of the superconducting conductor to serve as a cooling channel.

The superconducting conductor shown in FIG. 4 is composed of superconducting wires 1, double conduits, that is, conduits 2a and 2b, and a cooling channel 4, and the conduit 2b accommodates the superconducting wire 1. . Further, since the shapes of the conduit 2a and the conduit 2b are different from each other, a space can be created between the conduit 2a and the conduit 2b, and the cooling channel 4 is provided in the space.

[0005]

In the above-mentioned conventional forced cooling type superconducting conductor, as shown in FIG. 3, no spaces are formed at the four corners of the superconducting conductor to serve as cooling channels. Therefore, when forcedly circulating a refrigerant such as supercritical helium, the refrigerant does not flow uniformly in the conductor,
There have been cases where the conductor has a temperature distribution, and the flow rate of the refrigerant is limited due to the pressure loss, so that the downstream portion of the cooling path is not efficiently cooled. For this reason, when a current flows in the superconducting wire 1 and is in a superconducting state, if the temperature of the wire rises for some reason, the superconducting state transitions from the superconducting state to the normal conducting state, that is, the normal conduction spreads, that is, quench Occurs. When the quench occurs, Joule heat is generated at that portion, and in the worst case, the superconducting wire 1 may be damaged. Further, when the void ratio is increased in order to reduce the pressure loss, or when the cooling channels are provided at the four corners of the superconducting conductor in a double conduit as shown in FIG. It cools well,
There is a problem that the production cost of the superconducting conductor is high because the current density is lowered, the device is large, and the number of parts used is large.

The present invention has been made in view of the above circumstances. By reducing the pressure loss and increasing the flow rate of the refrigerant, the downstream portion of the cooling passage can be efficiently cooled and the production cost can be reduced. An object is to provide a forced cooling type superconducting conductor.

[0007]

According to the present invention, in a forced cooling type superconducting conductor having a plurality of superconducting wires inside a conduit, the outer peripheral surfaces of the plurality of twisted superconducting wires are spirally wound in the longitudinal direction. The outer peripheral tape which is wound and wound in a circular shape, and the inner peripheral shape of the conduit and the outer peripheral shape of the outer peripheral tape coated with the plurality of superconducting wires are made different from each other to form a space between the inner corners of the conduit and the outer peripheral tape. And a space formed between the four inner corners of the conduit and the outer peripheral tape, which is formed by wrapping the outer peripheral surface of the plurality of superconducting wires in the longitudinal direction by the outer peripheral tape. To form a cooling channel.

[0008]

The outer peripheral surface of a plurality of superconducting wires is spirally wound and wound by an outer peripheral tape, and the shape of the four corners of the inner surface of the conduit is made different from the shape of the outer peripheral tape covering the plurality of superconducting wires. A conduit and a plurality of superconducting wires covered by the outer peripheral tape are assembled to form a composite.

As described above, by spirally wrapping the entire outer peripheral surface of the plurality of superconducting wires with the outer peripheral tape, a large amount of refrigerant can be made to flow to the four corners of the superconducting conductor. In addition to the four corners, the superconducting wire can be spirally covered in the longitudinal direction to form a cooling channel that can uniformly and efficiently cool the inside of the superconducting conductor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the structure of a forced cooling type superconducting conductor according to an embodiment of the present invention.

The superconducting wire 1 shown in FIG. 1 is a portion for transmitting an electric current in the superconducting conductor. Usually, a plurality of wires (6 in FIG. 1) are made of aluminum, which is a wire of low resistance material such as aluminum. The stabilizing material 5 such as a wire is used as a twist core to be twisted around the stabilizing material 5 to form a transmission path for the current. The outer peripheral tape 3 is a metal tape such as SUS, and covers the outer peripheral surface of the plurality of twisted superconducting wires 1. The plurality of superconducting wires 1 covered with the outer peripheral tape 3 are housed inside the conduit 2. In this case, the shape of the four corners of the inner surface of the conduit 2 and the shape of the outer peripheral tape 3 covering the plurality of superconducting wires 1 are made different,
Spaces are formed between the four corners of the conduit 2 and the outer peripheral tape 3 to form cooling channels 4.

The structure of the above-mentioned superconducting conductor will be described in more detail. FIG. 2 is a view showing the structure of the forced cooling type superconducting conductor shown in FIG. 1 as seen from the longitudinal direction. FIG. 2 is a view showing the structure of the superconducting conductor when the outer peripheral surfaces of the plurality of twisted superconducting wires 1 are blown off by the outer peripheral tape 3 and covered.

As shown in FIG. 2, the outer circumferences of the plurality of superconducting wires 1 are sufficiently shorter than the twist pitch of the superconducting wires 1 by an outer peripheral tape 3 in order to maintain the final shape of the plurality of superconducting wires 1 twisted together. Spiral and wind at intervals. Next, the superconducting wire 1 and the conduit 2 which are blown off by the outer peripheral tape 3 are assembled and made into a composite to cover the outer peripheral surfaces of the plurality of superconducting wires 1 and have a spiral shape having a thickness of the outer peripheral tape 3. A sum space is created by combining the space and the space formed between the four corners of the inner surface of the conduit 2 shown in FIG. 1 and the outer peripheral tape 3. The cooling channel 4 is formed in the sum space. That is, the cooling channel 4 is a combination of the cooling channel formed in the space between the four corners of the inner surface of the conduit 2 and the outer peripheral tape 3 and the cooling channel formed in the spiral space. By flowing a coolant such as supercritical helium into the cooling channel 4 for forced cooling, the inside of the superconducting conductor is uniformly cooled in the longitudinal direction.

As described above, the cooling channel 4 capable of flowing a large amount of refrigerant in the conduit 2 can be formed. As a result, the pressure loss that occurs when the coolant is forcedly circulated in the cooling channel 4 can be reduced, and the flow rate of the coolant increases, so that the superconducting conductor can be cooled uniformly and efficiently, and the possibility of quenching is extremely high. Get lower. In addition, since it is not necessary to add new parts as compared with the conventional one, there is no increase in cost when manufacturing the superconducting conductor.

[0015]

As described above, according to the present invention,
The entire outer peripheral surface of a plurality of superconducting wires to be twisted together is blown and covered in the longitudinal direction using an outer peripheral tape,
By making the shape of the four corners of the inner surface of the conduit different from the shape of the outer peripheral tape covering a plurality of superconducting wires to form a composite with the conduit, the spiral space generated by the skip winding and the inner surface four corners and the outer circumference of the conduit Since the cooling channel can be formed in the sum space with the space between the tapes, the refrigerant is evenly flowed in the superconducting conductor, and
It is possible to flow a larger amount of refrigerant in the four corners of the superconducting conductor. As a result, the pressure loss that occurs when the coolant is forcedly circulated in the cooling channel can be reduced, and the flow rate of the coolant increases, so that it is possible to efficiently cool the downstream portion of the cooling path and improve stability against quenching. it can. Further, by using the two parts of the peripheral tape and the conduit, it is possible to reduce the number of parts to be produced and the production cost as compared with the conventional superconducting conductor.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of a forced cooling type superconducting conductor according to an embodiment of the present invention.

FIG. 2 is a view showing a structure in a longitudinal direction of a forced cooling type superconducting conductor in the same example.

FIG. 3 is a cross-sectional view showing a structure of a conventional forced cooling type superconducting conductor.

FIG. 4 is a cross-sectional view showing the structure of a conventional forced cooling type superconducting conductor made of a double conduit.

[Explanation of symbols]

 1 Superconducting wire 2, 2a, 2b Conduit 3 Peripheral tape 4 Cooling channel 5 Stabilizer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Irie 1-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries Ltd. Takasago Research Institute

Claims (1)

[Claims] 1. In a forced cooling type superconducting conductor having a plurality of superconducting wires inside a conduit, the outer peripheral surfaces of the plurality of twisted superconducting wires are spirally wound and covered in the longitudinal direction. An outer peripheral tape, and means for forming a space between the inner surface four corners of the conduit and the outer peripheral tape by differentiating the inner surface shape of the conduit and the outer peripheral shape of the outer peripheral tape covering the plurality of superconducting wires, It is possible to form a cooling channel by a sum space of a spiral space formed by wrapping the outer peripheral surface of a plurality of superconducting wires in the longitudinal direction by the outer peripheral tape and a space formed between the four corners of the inner surface of the conduit and the outer peripheral tape. The feature is the forced cooling type superconducting conductor.