CN114267983A - Conduction cooling type NbTi superconducting wire joint device and joint manufacturing method thereof - Google Patents
Conduction cooling type NbTi superconducting wire joint device and joint manufacturing method thereof Download PDFInfo
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- CN114267983A CN114267983A CN202111604774.1A CN202111604774A CN114267983A CN 114267983 A CN114267983 A CN 114267983A CN 202111604774 A CN202111604774 A CN 202111604774A CN 114267983 A CN114267983 A CN 114267983A
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Abstract
The invention relates to a conduction cooling type NbTi superconducting wire joint device and a joint manufacturing method. The preparation method of the conduction cooling NbTi superconducting wire joint comprises the following steps; etching the copper matrix by FeCl3 solution at two ends of the superconducting wire to expose NbTi filaments; weaving filaments of superconducting wires at two ends to be connected into a bundle; placing the woven superconducting wire connecting part into a groove of a lower pressing plate, and adding low-temperature brazing filler metal; placing the upper pressing plate, the lower pressing plate and the upper cover plate on a heating table for heating so as to completely melt the low-temperature brazing filler metal; covering the upper cover plate on the lower cover plate, and pre-tightening by using a pre-tightening screw; placing the manufactured joint device and naturally cooling to room temperature; and installing an insulating plate and a cold conducting plate. The invention has the advantages of simple manufacture process and equipment of the joint, stable and reliable structure and low resistance of the joint.
Description
Technical Field
The invention belongs to the field of superconduction, and mainly relates to a conduction cooling type NbTi superconducting wire joint device and a joint manufacturing method thereof.
Background
With the development of superconducting magnet technology, more and more magnetic fields in scientific research devices and facilities are generated by superconducting magnets, and the low-temperature superconducting magnet in the high-field magnetic field device is mainly composed of NbTi and Nb3Sn superconducting coil composition, Nb compared to NbTi material3Although Sn has a high transition temperature, Nb3The Sn superconducting coil has complex manufacturing process and needs heat treatment, and the ceramic phase generated after the heat treatment has large hardness and high brittleness, and is easy to be Nb3Causing irreversible damage in the Sn superconductor. Although the upper critical magnetic field of NbTi at 4.2K is only 11T, NbTi material is much lower than Nb3Sn, its yield strength is close to that of steel, and no heat load process is required after winding and assembling the stranded wire, so NbTi superconducting wire is widely used in medium and low magnetic field superconducting magnets.
The length of the NbTi superconducting wire used for the conduction-cooled close-wound low-temperature superconducting coil needs to be several tens or hundreds of kilometers. Because of the limitations of the superconducting wire production process and equipment, the length of a single superconducting wire is usually several hundred meters to several kilometers, and an NbTi superconducting magnet usually comprises a plurality of NbTi coils, it is necessary to design NbTi superconducting wire joints to connect several superconducting wires. The cold quantity obtained by the conduction cooling type superconducting magnet system is from a refrigerator cold head, at present, the refrigerating power of a commercial refrigerator is low, so that a special superconducting joint is needed in the process of manufacturing the superconducting magnet, enough small resistance can be guaranteed, the small Joule heat of the joint can be timely taken away through conduction cooling in the operation process, and the superconducting magnet system can be guaranteed to operate safely and stably.
Disclosure of Invention
The invention aims to disclose a conduction cooling type NbTi superconducting wire joint device and a joint manufacturing method, and the connection device is a low-resistance NbTi superconducting wire joint device with simple process and reliable performance.
The invention is realized by the following technical scheme: a conduction cooling type NbTi superconducting wire joint device comprises an upper pressing plate, a lower pressing plate, an upper cover plate, a lower cover plate, a cold conducting plate, an insulating plate, a pre-tightening bolt and an insulating bolt; the first NbTi superconducting wire and the second NbTi superconducting wire to be connected are also included;
the upper cover plate is of a cuboid structure, and a boss is arranged at the central line of the lower surface of the upper cover plate;
the lower cover plate is provided with a groove along the central line and matched with the boss; the upper cover plate and the lower cover plate are made of oxygen-free copper materials;
the groove of the lower cover plate is communicated along the central line, so that a first NbTi superconducting wire and a second NbTi superconducting wire are in lap joint and butt joint at two different sides;
the cold conducting plate is of a cuboid structure and is made of oxygen-free copper materials;
the upper pressing plate, the lower pressing plate and the pre-tightening bolts are rectangular blocks made of stainless steel and correspond to the sizes of the upper cover plate and the lower cover plate.
Furthermore, when the hand-held joint is manufactured, the groove of the lower cover plate is a left through groove and a right through groove;
when the arch hand type joint is manufactured, the groove of the lower cover plate is a semi-through groove with one end closed;
the length of the upper lug boss of the upper cover plate is always consistent with that of the groove in the lower cover plate.
Furthermore, the height of the boss is 0.9 × the diameter of the superconducting wire, which is the depth of the groove of the lower cover plate; the width of the groove is 1.5-2 times of the product of the number of the superconducting wires and the diameter of the cross section, and the depth of the groove is 2-4 mm.
Furthermore, the upper pressing plate, the lower pressing plate and the pre-tightening bolts are all made of stainless steel materials, the upper cover plate and the lower cover plate are tightly pressed through the pre-tightening bolts, the joints are protected, electrical contact inside the joints is tighter, and joint resistance is reduced;
the insulating plate is made of ALN material; the insulating bolt is made of G10 material.
Furthermore, 2 rows of through holes are formed in the upper pressing plate and the lower pressing plate, the transverse distance between the holes is 1-2 cm, the longitudinal distance is wider than the width of the cover plate, a bolt penetrates through the through holes to be connected through nuts during pre-tightening, and the bolts are sequentially screwed during stress application, so that the uniform pre-tightening force between the upper cover plate and the lower cover plate is ensured.
Further, lead cold plate, upper cover plate and insulation board all have two through-holes, and the distance between hole and the hole is 1 ~ 2cm, and the bolt passes the hole during pretension and connects with the nut, and the afterburning is screwed up in proper order, guarantees to lead cold plate, and the pretightning force is even and fully contacts between insulation board and the upper cover plate, increases area of contact each other, provides abundant cold area of leading.
Furthermore, the superconducting wire connecting part is formed by mutually weaving and splicing NbTi superconducting filaments in two superconducting wires which are mutually connected and is connected in a multi-bundle filament yarn shape.
Furthermore, the cold guide plate comprises a first cold guide plate, a second cold guide plate, a first insulating plate and a second insulating plate;
the first cold guide plate is connected to the upper surface of one side of the upper cover plate through a first insulating plate; the second cold conduction plate is connected to the other side upper surface of the upper cover plate through a second insulation plate.
According to another aspect of the present invention, a method for manufacturing a joint by using a NbTi superconducting wire joint device is provided, which comprises the following steps:
step 1, corroding a copper substrate by using FeCl3 solution at two ends of a superconducting wire for manufacturing a joint to expose NbTi filaments with the length of about 5-10 cm, then cleaning the NbTi filaments by using deionized water, finally cleaning the NbTi filaments by using alcohol, and standing and airing;
step 4, placing the upper pressing plate, the lower pressing plate and the connection part containing the superconducting filaments on a heating table, heating to 125-160 ℃, and slightly vibrating to discharge air bubbles after the low-temperature brazing filler metal is completely melted so that the brazing filler metal fully fills gaps in the connection part of the superconducting filaments;
step 5, covering the preheated upper pressing plate on the lower pressing plate, and pre-tightening by using a pre-tightening screw;
and 7, installing the cold guide plate and the insulating plate, placing the first cold guide plate and the second cold guide plate on the first insulating plate and the second insulating plate, placing the first cold guide plate and the second cold guide plate on the upper cover plate, and pre-tightening the first cold guide plate and the second cold guide plate by adopting insulating bolts.
The invention has the advantages that:
the conduction cooling type NbTi superconducting wire joint device is used for connecting two NbTi superconducting wires or connecting a plurality of NbTi coils, has simple manufacturing process, does not require complex process and equipment, and has stable and reliable structure and low joint resistance. The upper pressing plate, the lower pressing plate and the pre-tightening bolts are all made of stainless steel materials, the upper cover plate and the lower cover plate are tightly pressed through the pre-tightening bolts, the joints are protected, electrical contact inside the joints is enabled to be tighter, and joint resistance is reduced. The lower surface of top board and the upper surface of holding down plate open and have the recess that 1 ~ 2mm is dark, and recess size and joint upper and lower apron size are unanimous, and the apron about its purpose is fixed in the application of force in-process. The cold guide plate is connected with the insulating plate and the upper cover plate through pre-tightening bolts, so that the full cold guide area can be provided, and the cold guide plate and the upper cover plate can be insulated.
Drawings
FIG. 1 is a schematic drawing of a twist of a NbTi superconducting filament;
FIG. 2 is a schematic view of a hand-held NbTi superconducting wire joint;
FIG. 3 is a schematic view of a crowned NbTi superconducting wire joint;
description of reference numerals: 1-a first NbTi superconducting filament, 2-a second NbTi superconducting filament, 3-an upper pressing plate, 4-an upper cover plate, 5-a first NbTi superconducting wire, 8-a second NbTi superconducting wire, 6-a lower pressing plate, 7-a lower cover plate, 9-a first cold guiding plate, 10-a second cold guiding plate, 11-a first insulating plate and 12-a second insulating plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
According to an embodiment of the present invention, a conduction cooling type NbTi superconducting wire joint device is provided, as shown in fig. 1 to 3, including an upper press plate 3, a lower press plate 6, an upper cover plate 4, a lower cover plate 7, a first cold conduction plate 9, a second cold conduction plate 10, a first insulating plate 11, a second insulating plate 12, a pre-tightening bolt, and an insulating bolt; the connection structure also comprises a first NbTi superconducting wire 5 and a second NbTi superconducting wire 8 to be connected;
the upper cover plate is of a 4-bit long cube structure, and a boss is arranged at the central line of the lower surface of the upper cover plate;
the lower cover plate 7 is provided with a groove along the central line and matched with the boss; the upper cover plate and the lower cover plate are made of oxygen-free copper materials.
The height of the boss is 0.9 × the diameter of the superconducting wire; the width of the groove is 1.5-2 times of the product of the number of the superconducting wires and the diameter of the cross section, and the depth of the groove is 2-4 mm;
the upper pressing plate 3, the lower pressing plate 6 and the pre-tightening bolts are all rectangular blocks made of stainless steel materials and correspond to the sizes of the upper cover plate and the lower cover plate;
according to one embodiment of the invention, the groove of the lower cover plate 7 is arranged along the central line, and when the hand-held joint is manufactured, the groove of the lower cover plate is a left through groove and a right through groove; so that the first NbTi superconducting wire 5 and the second NbTi superconducting wire 8 are in lap joint and butt joint at two different sides (namely, the holding type NbTi joint superconducting filaments are oppositely woven);
according to another embodiment of the invention, when the arched hand type joint is manufactured, the groove of the lower cover plate is a semi-through groove with one closed end; namely, the length of the groove of the lower cover plate 7 is smaller than the length of the lower cover plate in the axial direction, so that one end of the groove is closed, and under the structure, the first NbTi superconducting wire 5 and the second NbTi superconducting wire 8 can be conveniently welded on the same side (namely, the Archer hand type NbTi joints are woven in the same direction);
furthermore, the length of the upper lug boss of the upper cover plate is consistent with that of the groove in the lower cover plate all the time.
The manufacturing method of the NbTi superconducting wire joint comprises the following steps:
step 1, firstly, FeCl is used at two ends of NbTi superconducting wire needing to manufacture joints3Corroding a copper substrate by using the solution to expose NbTi superconducting filaments with the length of about 2-5 cm, cleaning the NbTi superconducting filaments by using deionized water, cleaning the NbTi superconducting filaments by using alcohol, and standing and airing;
step 4, placing the woven superconducting wire connecting part into a groove of the lower cover plate, wherein the width of the groove is 1.5-2 times of the product of the number of the superconducting wires and the diameter of the cross section, and the depth of the groove is 2-4 mm;
step 5, matching the width of the boss part of the upper cover plate with the width of the groove of the lower cover plate, wherein the height of the boss is-0.9 times the diameter of the superconducting wire of the groove depth of the lower cover plate;
step 8, through holes are formed in the upper pressing plate and the lower pressing plate and used for installing pre-tightening bolts, the pre-tightening bolts are tightened, the upper cover plate and the lower cover plate of the joint are pressed tightly, and the superconducting filaments and the filaments, the brazing material and the superconducting filaments and the upper cover plate and the lower cover plate are tightly contacted;
step 9, placing the manufactured joint device and naturally cooling to room temperature;
and step 10, placing the first cold guide plate and the second cold guide plate on the first insulating plate and the second insulating plate, then placing the first cold guide plate and the second cold guide plate on the upper cover plate, and pre-tightening the first cold guide plate and the second cold guide plate by adopting insulating bolts.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.
Claims (9)
1. A conduction cooling type NbTi superconducting wire joint device is characterized in that: the cold guide plate comprises an upper pressing plate, a lower pressing plate, an upper cover plate, a lower cover plate, a cold guide plate, an insulating plate, a pre-tightening bolt and an insulating bolt; the first NbTi superconducting wire and the second NbTi superconducting wire to be connected are also included;
the upper cover plate is of a cuboid structure, and a boss is arranged at the central line of the lower surface of the upper cover plate;
the lower cover plate is provided with a groove along the central line and matched with the boss; the upper cover plate and the lower cover plate are made of oxygen-free copper materials;
the groove of the lower cover plate is communicated along the central line, so that a first NbTi superconducting wire and a second NbTi superconducting wire are in lap joint and butt joint at two different sides;
the cold conducting plate is of a cuboid structure and is made of oxygen-free copper materials;
the upper pressing plate, the lower pressing plate and the pre-tightening bolts are rectangular blocks made of stainless steel and correspond to the sizes of the upper cover plate and the lower cover plate.
2. The conduction-cooled NbTi superconducting wire joint device of claim 1, wherein:
when the hand-held joint is manufactured, the groove of the lower cover plate is a left through groove and a right through groove;
when the arch hand type joint is manufactured, the groove of the lower cover plate is a semi-through groove with one end closed;
the length of the upper lug boss of the upper cover plate is always consistent with that of the groove in the lower cover plate.
3. The conduction-cooled NbTi superconducting wire joint device of claim 1, wherein:
the height of the boss is 0.9 × the diameter of the superconducting wire; the width of the groove is 1.5-2 times of the product of the number of the superconducting wires and the diameter of the cross section, and the depth of the groove is 2-4 mm.
4. The conduction-cooled NbTi superconducting wire joint device of claim 1, wherein:
the upper pressing plate, the lower pressing plate and the pre-tightening bolts are all made of stainless steel materials, the upper cover plate and the lower cover plate are tightly pressed through the pre-tightening bolts, the joints are protected, electrical contact inside the joints is tighter, and joint resistance is reduced;
the insulating plate is made of ALN material; the insulating bolt is made of G10 material.
5. The conduction-cooled NbTi superconducting wire joint device of claim 1, wherein:
the upper pressing plate and the lower pressing plate are provided with 2 rows of through holes, the transverse distance between the holes is 1-2 cm, the longitudinal distance is wider than the width of the cover plate, a bolt penetrates through the through holes to be connected through nuts during pre-tightening, the bolt is sequentially screwed down during stress application, and the uniform pre-tightening force between the upper cover plate and the lower cover plate is ensured.
6. The conduction-cooled NbTi superconducting wire joint device of claim 1, wherein:
lead the cold drawing, upper cover plate and insulation board all have two through-holes, and the distance between hole and the hole is 1 ~ 2cm, and the bolt passes the hole during pretension and connects with the nut, and the afterburning is screwed up in proper order, guarantees to lead the cold drawing, and the even and abundant contact of pretightning force between insulation board and the upper cover plate increases area of contact each other, provides abundant cold area of leading.
7. The conduction-cooled NbTi superconducting wire joint device of claim 1, wherein:
the superconducting wire connecting part is formed by mutually weaving and splicing NbTi superconducting filaments in two superconducting wires which are mutually connected and is in multi-bundle-strand connection.
8. The conduction-cooled NbTi superconducting wire joint device of claim 1, wherein:
the cold guide plate comprises a first cold guide plate, a second cold guide plate, a first insulating plate and a second insulating plate;
the first cold guide plate is connected to the upper surface of one side of the upper cover plate through a first insulating plate; the second cold conduction plate is connected to the other side upper surface of the upper cover plate through a second insulation plate.
9. A method of making a joint according to any one of claims 1 to 8, wherein the steps of:
step 1, corroding a copper substrate by using FeCl3 solution at two ends of a superconducting wire for manufacturing a joint to expose NbTi filaments with the length of about 5-10 cm, then cleaning the NbTi filaments by using deionized water, finally cleaning the NbTi filaments by using alcohol, and standing and airing;
step 2, weaving 2-4 NbTi filaments of superconducting wires at two ends to be connected into a bundle;
step 3, placing the connection part of the woven superconducting wire into a groove of a lower pressing plate, and adding a low-temperature brazing filler metal with the melting temperature of 120-150 ℃;
step 4, placing the upper pressing plate, the lower pressing plate and the connection part containing the superconducting filaments on a heating table, heating to 125-160 ℃, and slightly vibrating to discharge air bubbles after the low-temperature brazing filler metal is completely melted so that the brazing filler metal fully fills gaps in the connection part of the superconducting filaments;
step 5, covering the preheated upper pressing plate on the lower pressing plate, and pre-tightening by using a pre-tightening screw;
step 6, placing the manufactured joint device and naturally cooling to room temperature;
and 7, installing the cold guide plate and the insulating plate, placing the first cold guide plate and the second cold guide plate on the first insulating plate and the second insulating plate, placing the first cold guide plate and the second cold guide plate on the upper cover plate, and pre-tightening the first cold guide plate and the second cold guide plate by adopting insulating bolts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111604774.1A CN114267983A (en) | 2021-12-24 | 2021-12-24 | Conduction cooling type NbTi superconducting wire joint device and joint manufacturing method thereof |
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| CN202111604774.1A CN114267983A (en) | 2021-12-24 | 2021-12-24 | Conduction cooling type NbTi superconducting wire joint device and joint manufacturing method thereof |
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