A superconducting shield connection assembly for single core structure superconducting cable termination

Abstract

This invention discloses a superconducting shielding layer connection assembly for a single-core superconducting cable terminal, comprising a shielding layer connecting conductor, a lead-out conductor, a connector conductor, and a threaded sleeve. The shielding layer connecting conductor includes a first sleeve and a second sleeve, with the second sleeve fixed to the lower end of the outer circumferential surface of the first sleeve. The cable core passes through the first sleeve, and the superconducting shielding layer is electrically connected to the outer circumferential surface of the first sleeve. The lead-out conductor is inserted into the second sleeve. One end of the connector conductor is a plug-in portion, and the other end is a connecting portion; the plug-in portion is inserted into the lead-out conductor. The threaded sleeve is screwed onto the outer circumferential surface of the second sleeve, and the threaded sleeve is used to push the lead-out conductor into the second sleeve and radially compress the lead-out conductor, causing the lead-out conductor to grip the plug-in portion and achieving tight contact between the second sleeve, the lead-out conductor, and the connector conductor. This invention enables reliable and convenient electrical connection of the superconducting shielding layer within the limited space of a single-core superconducting cable terminal.

Description

Technical Field

[0001] This invention belongs to the field of superconducting cable technology, specifically relating to a superconducting shielding layer connection assembly for a single-core superconducting cable terminal. Background Technology

[0002] With the development of superconducting technology, superconducting cables have begun to attract attention and are gradually being applied due to their advantages such as low loss and large capacity. Currently, the typical structure of a single-core superconducting cable usually includes, from the inside out, a supporting frame, a superconducting conductor layer, an electrical insulation layer, a superconducting shielding layer, a cryogenic insulation layer, and an outer sheath. The inside of the supporting frame can be used as a flow channel for the refrigerant liquid nitrogen. The superconducting shielding layer needs to be connected in a certain way within the terminal of the superconducting cable and the electrical circuitry needs to be led out of the terminal to achieve grounding or electrical connection with the superconducting shielding layers in other phases of the superconducting cable. The insulated core, composed of the supporting frame, the superconducting conductor layer, the electrical insulation layer, and the superconducting shielding layer, operates in a cryogenic environment.

[0003] To meet insulation requirements, the termination of superconducting cables typically needs to have a vacuum structure. Specifically, the termination includes an inner layer and an outer layer, with the cavity between them forming a vacuum layer. The inner layer needs to withstand the pressure generated by the partial depressurization and evaporation of liquid nitrogen. To reduce heat loss, the size of the termination should be designed to be as compact as possible.

[0004] However, due to the limited overall size of the terminal, the internal operating space for connecting the superconducting shielding layer is extremely small, resulting in considerable inconvenience during actual assembly or maintenance. Therefore, how to achieve a reliable and convenient electrical connection of the superconducting shielding layer within the limited space of the terminal has become a pressing technical problem to be solved in this field. Summary of the Invention

[0005] In view of the above-mentioned deficiencies of the prior art, the present invention provides a superconducting shielding layer connection assembly for a single-core superconducting cable terminal, which can realize a reliable and convenient electrical connection of the superconducting shielding layer within the limited space of the single-core superconducting cable terminal.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A superconducting shielding layer connection assembly for the termination of a single-core superconducting cable. The single-core superconducting cable includes a support frame, a superconducting conductor layer, an electrical insulation layer, and a superconducting shielding layer. The support frame, the superconducting conductor layer, and the electrical insulation layer constitute the cable core.

[0008] The superconducting shielding layer connection assembly includes a shielding layer connecting conductor, a lead-out conductor, a connector conductor, and a threaded sleeve. The shielding layer connecting conductor includes a first sleeve and a second sleeve. The second sleeve is fixed to the lower end of the outer circumferential surface of the first sleeve. The cable core passes through the first sleeve, and the superconducting shielding layer is electrically connected to the outer circumferential surface of the first sleeve. The lead-out conductor is inserted into the second sleeve. One end of the connector conductor is a plug-in portion, and the other end is a connecting portion. The plug-in portion is inserted into the lead-out conductor. The threaded sleeve is screwed onto the outer circumferential surface of the second sleeve to push the lead-out conductor into the second sleeve and radially compress the lead-out conductor, so that the lead-out conductor hugs the plug-in portion, achieving close contact between the second sleeve, the lead-out conductor, and the connector conductor, and achieving electrical connection between the superconducting shielding layer and the connector conductor.

[0009] Furthermore, one end of the first sleeve is the insertion end and the other end is the exit end, and the second sleeve is positioned close to the exit end.

[0010] Furthermore, the axes of the second sleeve, the lead conductor, the connector conductor, and the threaded sleeve coincide; the inner circumferential surface of the second sleeve is a smooth conical surface, one end of the second sleeve is close to the first sleeve and is called the first end of the second sleeve, and the other end of the second sleeve is far from the first sleeve and is called the second end of the second sleeve, the inner diameter of the first end of the second sleeve is smaller than the inner diameter of the second end of the second sleeve, and the outer circumferential surface of the second sleeve is an externally threaded cylindrical surface; the lead conductor is an elastic sleeve-like structure with openings at both the top and bottom, and the outer circumferential surface of the lead conductor is smooth and adapted to the inner circumferential surface of the second sleeve.

[0011] Furthermore, a fully disconnected channel is provided along the axial direction on the lead conductor, passing through both the upper and lower ends of the lead conductor; multiple semi-disconnected channels are also provided along the axial direction on the lead conductor, one end of the semi-disconnected channel extends to the corresponding end of the lead conductor, and the other end of the semi-disconnected channel is spaced a certain distance from the other end of the lead conductor and is called the semi-disconnected channel connection end.

[0012] Furthermore, the semi-disconnected channel connection ends of two adjacent semi-disconnected channels are staggered vertically.

[0013] Furthermore, the lead-out conductor is a conical sleeve, the inner circumferential surface of the lead-out conductor is smooth and has the same taper as the outer circumferential surface; the circumferential surface of the plug-in portion is smooth and is adapted to the inner circumferential surface of the lead-out conductor.

[0014] Furthermore, the threaded sleeve is cylindrical in shape, with the upper part being the threaded sleeve body and the bottom being an annular abutment platform. The inner diameter of the annular abutment platform is smaller than the inner diameter of the threaded sleeve body and the outer diameter of the lower end of the lead-out conductor. The inner circumferential surface of the threaded sleeve body is an internally threaded cylindrical surface that matches the outer circumferential surface of the second sleeve.

[0015] Furthermore, the outer circumferential surface of the threaded sleeve body is provided with a plurality of screw-in grooves along the axial direction. The screw-in grooves are used to cooperate with a rotating tool to realize the rotation of the threaded sleeve.

[0016] Furthermore, the connecting part is used for grounding or electrical connection with the superconducting shielding layer of other phase superconducting cables. The connecting part is a prefabricated superconducting strip or soft copper conductor. The superconducting shielding layer is welded to the outer circumferential surface of the first sleeve to realize the electrical connection between the superconducting shielding layer and the first sleeve.

[0017] A method for connecting a superconducting shielding layer for a single-core superconducting cable terminal, using the aforementioned superconducting shielding layer connection assembly for a single-core superconducting cable terminal, is characterized by the following steps: First, the cable core is inserted into the first sleeve, and the superconducting shielding layer is electrically connected to the outer circumferential surface of the first sleeve. Then, the upper end of the lead-out conductor is inserted into the second sleeve, and the upper end of the threaded sleeve is screwed onto the outer circumferential surface of the second sleeve. The insertion part of the connector conductor is then inserted into the lead-out conductor. Next, the threaded sleeve is rotated so that the entire threaded sleeve is screwed onto the outer circumferential surface of the second sleeve. During the movement of the threaded sleeve relative to the second sleeve, the lead-out conductor is pushed into the second sleeve and radially compressed, causing the lead-out conductor to tightly grip the insertion part of the connector conductor. This achieves close contact between the second sleeve, the lead-out conductor, and the connector conductor, and realizes the electrical connection between the superconducting shielding layer and the connector conductor.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The superconducting shielding layer connection assembly for a single-core superconducting cable terminal in this invention includes a shielding layer connection conductor, a lead-out conductor, a connector conductor, and a threaded sleeve. The shielding layer connection conductor includes a first sleeve and a second sleeve. The second sleeve is fixed to the lower end of the outer circumferential surface of the first sleeve. The cable core passes through the first sleeve, and the superconducting shielding layer is electrically connected to the outer circumferential surface of the first sleeve. The lead-out conductor is inserted into the second sleeve. One end of the connector conductor is a plug-in portion, and the other end is a connection portion. The plug-in portion is inserted into the lead-out conductor. The threaded sleeve is screwed onto the outer circumferential surface of the second sleeve to push the lead-out conductor into the second sleeve and radially compress the lead-out conductor, so that the lead-out conductor hugs the plug-in portion, achieving close contact between the second sleeve, the lead-out conductor, and the connector conductor, and achieving electrical connection between the superconducting shielding layer and the connector conductor. In this process of connecting the superconducting shielding layer, the cable core is first threaded through the first sleeve, and the superconducting shielding layer is electrically connected to the outer circumference of the first sleeve. Then, the upper end of the lead-out conductor is inserted into the second sleeve, and the upper end of the threaded sleeve is screwed onto the outer circumference of the second sleeve. The insertion part of the connector conductor is then inserted into the lead-out conductor. The threaded sleeve is then rotated, causing it to be screwed onto the outer circumference of the second sleeve. As the threaded sleeve moves relative to the second sleeve, it pushes the lead-out conductor into the second sleeve and radially compresses it, causing the lead-out conductor to grip the insertion part of the connector conductor. This achieves tight contact between the second sleeve, the lead-out conductor, and the connector conductor, thus realizing the superconducting shielding layer's connection. Electrical connection between the superconducting shielding layer and the connector conductor; since the superconducting shielding layer is electrically connected to the first sleeve and the second sleeve is electrically connected to the first sleeve, and the threaded sleeve enables close contact between the second sleeve, the lead conductor, and the connector conductor, thereby achieving electrical connection between the superconducting shielding layer and the connector conductor. The connector conductor extends to the outside of the single-core superconducting cable terminal. Therefore, through the setup of the shielding layer connecting conductor, lead conductor, connector conductor, and threaded sleeve, the large current of the superconducting shielding layer can be led out to the outside of the single-core superconducting cable terminal through the connector conductor within the limited space of the single-core superconducting cable terminal, achieving a reliable and convenient electrical connection of the superconducting shielding layer. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of the shielding layer connecting the conductor in this invention;

[0021] Figure 2 This is a schematic diagram of the left view of the shielding layer connecting the conductor in this invention;

[0022] Figure 3 This is a schematic diagram of the main structure of the conductor in this invention;

[0023] Figure 4 This is a top view of the conductor structure in this invention;

[0024] Figure 5This is a schematic diagram of the main structure of the threaded sleeve in this invention;

[0025] Figure 6 This is a top view of the threaded sleeve in this invention.

[0026] Figure 7 This is a schematic diagram of the main structure of the connector conductor in this invention;

[0027] Figure 8 This is a partial cross-sectional view of the superconducting shielding layer connection assembly used for single-core superconducting cable terminals in this invention.

[0028] Figure 9 for Figure 8 A partially enlarged structural diagram.

[0029] Explanation of reference numerals in the figure: 1. Shielding layer connecting conductor; 101. First sleeve; 10101. Insertion end; 10102. Exit end; 10103. Conical outer circumferential surface of the first sleeve; 10104. Cylindrical outer circumferential surface of the first sleeve; 102. Second sleeve; 10201. First end of the second sleeve; 10202. Second end of the second sleeve; 10203. External threaded cylindrical surface; 2. Lead conductor; 201. Fully disconnected channel; 202. Partially disconnected channel; 3. Connector conductor; 301. Insertion part; 302. Connecting part; 4. Threaded sleeve; 401. Threaded sleeve body; 40101. Internal threaded cylindrical surface; 40102. Screw groove; 402. Circular abutment platform; 501. Cable core; 502. Superconducting shielding layer. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0031] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] A superconducting shielding layer connection assembly for the termination of a single-core superconducting cable. The single-core superconducting cable includes a support frame, a superconducting conductor layer, an electrical insulation layer, and a superconducting shielding layer. The support frame, the superconducting conductor layer, and the electrical insulation layer constitute the cable core.

[0035] like Figure 8 and Figure 9 As shown, the superconducting shielding layer connection assembly includes a shielding layer connection conductor 1, a lead-out conductor 2, a connector conductor 3, and a threaded sleeve 4. The shielding layer connection conductor 1 is located within the terminal of a single-core superconducting cable and includes a first sleeve 101 and a second sleeve 102 electrically connected. One end of the first sleeve 101 is an insertion end 10101, and the other end is an exit end 10102. The second sleeve 102 is fixed to the lower end of the outer circumference of the first sleeve 101 near the exit end 10102. Figure 1 and Figure 2 The cable core is inserted into the first sleeve 101 and the superconducting shield is electrically connected to the outer circumference of the first sleeve 101; the lead conductor 2 is inserted into the second sleeve 102; one end of the connector conductor 3 is a plug-in part 301 and the other end is a connector part 302 extending to the outside of the single-core superconducting cable terminal, see Figure 7 The plug part 301 is inserted into the lead conductor 2; the threaded sleeve 4 is screwed onto the outer circumferential surface of the second sleeve 102, and the threaded sleeve 4 is used to push the lead conductor 2 into the second sleeve 102 and radially squeeze the lead conductor 2, so that the lead conductor 2 hugs the plug part 301, realizing the close contact between the second sleeve 102, the lead conductor 2 and the connector conductor 3, and realizing the electrical connection between the superconducting shielding layer and the connector conductor 3.

[0036] In this way, when connecting the superconducting shielding layer, the cable core is first inserted into the first sleeve 101, and the superconducting shielding layer is electrically connected to the outer circumferential surface of the first sleeve 101. Then, the upper end of the lead conductor 2 is inserted into the second sleeve 102, and the upper end of the threaded sleeve 4 is screwed onto the outer circumferential surface of the second sleeve 102. The insertion part 301 of the connector conductor 3 is then inserted into the lead conductor 2. After that, the threaded sleeve 4 is rotated so that the entire threaded sleeve 4 is screwed onto the outer circumferential surface of the second sleeve 102. During the movement of the threaded sleeve 4 relative to the second sleeve 102, it pushes the lead conductor 2 into the second sleeve 102 and radially compresses the lead conductor 2, so that the lead conductor 2 hugs the insertion part 301 of the connector conductor 3, thereby realizing the connection between the second sleeve 102, the lead conductor 2, and the connector conductor 3. The superconducting shielding layer and the connector conductor 3 are in close contact and electrically connected. Since the superconducting shielding layer is electrically connected to the first sleeve 101 and the second sleeve 102 is electrically connected to the first sleeve 101, the threaded sleeve 4 enables close contact between the second sleeve 102, the lead conductor 2 and the connector conductor 3, thereby enabling electrical connection between the superconducting shielding layer and the connector conductor 3. The connecting part 302 of the connector conductor 3 extends to the outside of the single-core superconducting cable terminal. Therefore, through the setting of the shielding layer connecting conductor 1, the lead conductor 2, the connector conductor 3 and the threaded sleeve 4, the large current of the superconducting shielding layer can be led out to the outside of the single-core superconducting cable terminal through the connector conductor 3 within the limited space of the single-core superconducting cable terminal, thus achieving a reliable and convenient electrical connection of the superconducting shielding layer.

[0037] In one embodiment, the axes of the second sleeve 102, the lead conductor 2, the connector conductor 3, and the threaded sleeve 4 coincide; as shown... Figure 1 and Figure 2 As shown, the inner circumferential surface of the second sleeve 102 is a smooth conical surface. One end of the second sleeve 102 is close to the first sleeve 101 and is called the first end 10201 of the second sleeve. The other end of the second sleeve 102 is away from the first sleeve 101 and is called the second end 10202 of the second sleeve. The inner diameter of the first end 10201 of the second sleeve is smaller than the inner diameter of the second end 10202 of the second sleeve. The outer circumferential surface of the second sleeve 102 is an externally threaded cylindrical surface 10203. Figure 3 and Figure 4 As shown, the lead conductor 2 is an elastic sleeve-shaped structure with openings at both the top and bottom ends. The outer circumferential surface of the lead conductor 2 is smooth and matches the inner circumferential surface of the second sleeve 102.

[0038] In this way, as the threaded sleeve 4 pushes the lead conductor 2 into the second sleeve 102, the radial compressive force on the lead conductor 2 gradually increases, thus ensuring the firmness of the connection between the lead conductor 2 and the second sleeve 102.

[0039] Among them, such as Figure 3 and Figure 4As shown, a fully disconnected channel 201 is provided along the axial direction on the lead conductor 2, which runs through both the upper and lower ends of the lead conductor 2; multiple semi-disconnected channels 202 are also provided along the axial direction on the lead conductor 2. One end of the semi-disconnected channel 202 extends to the corresponding end of the lead conductor 2, and the other end of the semi-disconnected channel 202 is spaced a certain distance from the other end of the lead conductor 2 and is called the semi-disconnected channel connection end.

[0040] By setting up the fully disconnected channel 201, it can be ensured that the lead conductor 2 can retract inward when subjected to an inward force and expand outward when subjected to an outward force. By setting up multiple semi-disconnected channels 202, it can be further ensured that the lead conductor 2 can slightly expand outward or retract inward when subjected to external force. In particular, when the threaded sleeve 4 pushes the lead conductor 2 to move into the second sleeve 102, the lead conductor 2 can retract inward and hug the insertion part 301 of the connector conductor 3 under the action of radial extrusion force.

[0041] Preferably, the semi-disconnected channel connection ends of two adjacent semi-disconnected channels 202 are staggered vertically, see Figure 3 and Figure 4 .

[0042] In this way, when the lead conductor 2 is subjected to external force, the structural strength of the lead conductor 2 can be guaranteed while ensuring that the lead conductor 2 expands slightly outward or contracts slightly inward.

[0043] Among them, such as Figure 3 As shown, the lead conductor 2 is a conical sleeve, and the inner circumferential surface of the lead conductor 2 is smooth and has the same taper as the outer circumferential surface; the circumferential surface of the insertion part 301 is smooth and matches the inner circumferential surface of the lead conductor 2. Figure 7 .

[0044] As the threaded sleeve 4 pushes the lead conductor 2 into the second sleeve 102, the radial compressive force on the lead conductor 2 gradually increases. As a result, the radial compressive force exerted by the lead conductor 2 on the insertion part 301 of the connector conductor 3 also gradually increases. Therefore, the connection between the second sleeve 102, the lead conductor 2 and the connector conductor 3 can be guaranteed.

[0045] Among them, such as Figure 5 and Figure 6 As shown, the threaded sleeve 4 is cylindrical in shape. The upper part of the threaded sleeve 4 is the threaded sleeve body 401 and the bottom is an annular abutment platform 402. The inner diameter of the annular abutment platform 402 is smaller than the inner diameter of the threaded sleeve body 401 and the outer diameter of the lower end of the lead conductor 2. The inner circumferential surface of the threaded sleeve body 401 is an internally threaded cylindrical surface 40101 that is adapted to the outer circumferential surface of the second sleeve 102.

[0046] By setting up the annular abutment platform 402, when the threaded sleeve 4 moves relative to the second sleeve 102, it can push the lead conductor 2 to move into the second sleeve 102.

[0047] Preferably, such as Figure 5 and Figure 6 As shown, a plurality of screw-in grooves 40102 are provided along the axial direction on the outer circumferential surface of the threaded sleeve body 401. The screw-in grooves 40102 are used to cooperate with a rotating tool to realize the rotation of the threaded sleeve 4.

[0048] The multiple screw-in grooves 40102 facilitate the rotation of the threaded sleeve 4 using a rotating tool.

[0049] In one embodiment, the connection portion 302 is used for grounding or electrical connection with the superconducting shielding layer of other phase superconducting cables, and the connection portion 302 is a prefabricated superconducting strip or soft copper conductor.

[0050] Since the connecting part 302 is a prefabricated superconducting strip or soft copper conductor, there is no need to fabricate the connecting part 302 of the connector conductor 3 in the limited space of the single-core superconducting cable terminal.

[0051] Preferably, the connecting portion 302 is cylindrical in shape, see Figure 7 .

[0052] In one embodiment, the superconducting shielding layer is welded to the outer peripheral surface of the first sleeve 101 to achieve electrical connection between the superconducting shielding layer and the first sleeve 101.

[0053] Preferably, such as Figure 1 As shown, the outer peripheral surface of the first sleeve 101 includes a first sleeve conical outer peripheral surface 10103 near the insertion end 10101 and a first sleeve cylindrical outer peripheral surface 10104 near the exit end 10102. One end of the first sleeve conical outer peripheral surface 10103 is located at the insertion end 10101 and is referred to as the first end of the first sleeve conical outer peripheral surface 10103. The other end of the first sleeve conical outer peripheral surface 10103 is connected to the first sleeve cylindrical outer peripheral surface 10104. One end of the outer peripheral surface 10104 is smoothly transitioned and is called the second end of the first sleeve conical outer peripheral surface 10103. The diameter of the first end of the first sleeve conical outer peripheral surface 10103 is smaller than the diameter of the second end of the first sleeve conical outer peripheral surface 10103. The superconducting strip of the superconducting shielding layer is laid on the first sleeve conical outer peripheral surface 10103 and welded to the first sleeve cylindrical outer peripheral surface 10104 to realize the electrical connection between the superconducting shielding layer and the first sleeve 101.

[0054] In one embodiment, the shielding layer connecting conductor 1, the lead conductor 2, and the connector conductor 3 are all made of copper or copper with a silver-plated surface.

[0055] A method for connecting a superconducting shielding layer for a single-core superconducting cable terminal, using the aforementioned superconducting shielding layer connection assembly for a single-core superconducting cable terminal, specifically involves: first, inserting the cable core into the first sleeve 101, and electrically connecting the superconducting shielding layer to the outer circumferential surface of the first sleeve 101; then, inserting the upper end of the lead conductor 2 into the second sleeve 102, and screwing the upper end of the threaded sleeve 4 onto the outer circumferential surface of the second sleeve 102; and finally, connecting the insertion portion 301 of the connector conductor 3. Insert the lead conductor 2 into the second sleeve 102, and then rotate the threaded sleeve 4 so that the threaded sleeve 4 is screwed onto the outer circumferential surface of the second sleeve 102. As the threaded sleeve 4 moves relative to the second sleeve 102, it pushes the lead conductor 2 into the second sleeve 102 and radially squeezes the lead conductor 2, so that the lead conductor 2 hugs the insertion part 301 of the connector conductor 3, thereby achieving close contact between the second sleeve 102, the lead conductor 2 and the connector conductor 3, and achieving electrical connection between the superconducting shielding layer and the connector conductor 3.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A superconducting shielding layer connection assembly for a single-core superconducting cable terminal, the single-core superconducting cable comprising a supporting skeleton, a superconducting conductor layer, an electrical insulation layer, and a superconducting shielding layer, wherein the supporting skeleton, the superconducting conductor layer, and the electrical insulation layer constitute the cable core; characterized in that: The superconducting shielding layer connection assembly includes a shielding layer connection conductor (1), a lead-out conductor (2), a connector conductor (3), and a threaded sleeve (4); the shielding layer connection conductor (1) includes a first sleeve (101) and a second sleeve (102), the second sleeve (102) is fixed to the lower end of the outer circumference of the first sleeve (101), the cable core is inserted into the first sleeve (101), and the superconducting shielding layer is electrically connected to the outer circumference of the first sleeve (101); the lead-out conductor (2) is inserted into the second sleeve (102); one end of the connector conductor (3) The first end is a plug-in part (301) and the other end is a connector part (302). The plug-in part (301) is inserted into the lead conductor (2). The threaded sleeve (4) is screwed onto the outer circumferential surface of the second sleeve (102) to push the lead conductor (2) into the second sleeve (102) and radially squeeze the lead conductor (2), so that the lead conductor (2) hugs the plug-in part (301), realizing the close contact of the second sleeve (102), the lead conductor (2) and the connector conductor (3), and realizing the electrical connection between the superconducting shielding layer and the connector conductor (3).

2. A superconducting shield connection assembly for a single core structure superconducting cable termination according to claim 1, characterized in that: One end of the first sleeve (101) is the insertion end (10101) and the other end is the exit end (10102), and the second sleeve (102) is set close to the exit end (10102).

3. A superconducting shield connection assembly for a single core structure superconducting cable termination according to claim 2, wherein: The axes of the second sleeve (102), the lead conductor (2), the connector conductor (3), and the threaded sleeve (4) coincide; the inner circumferential surface of the second sleeve (102) is a smooth conical surface; one end of the second sleeve (102) is close to the first sleeve (101) and is called the first end of the second sleeve (10201); the other end of the second sleeve (102) is far away from the first sleeve (101) and is called the second end of the second sleeve (10202); the inner diameter of the first end of the second sleeve (10201) is smaller than the inner diameter of the second end of the second sleeve (10202); the outer circumferential surface of the second sleeve (102) is an externally threaded cylindrical surface (10203); the lead conductor (2) is an elastic sleeve-shaped structure with openings at both the top and bottom; the outer circumferential surface of the lead conductor (2) is smooth and matches the inner circumferential surface of the second sleeve (102).

4. A superconducting shield connection assembly for a single core structure superconducting cable termination according to claim 3, wherein: A fully disconnected channel (201) is provided along the axial direction on the lead conductor (2), which runs through both the upper and lower ends of the lead conductor (2); multiple semi-disconnected channels (202) are also provided along the axial direction on the lead conductor (2), one end of the semi-disconnected channel (202) extends to the corresponding end of the lead conductor (2), and the other end of the semi-disconnected channel (202) is spaced a certain distance from the other end of the lead conductor (2) and is called the semi-disconnected channel connection end.

5. A superconducting shield connection assembly for a single core structure superconducting cable termination according to claim 4, wherein: The semi-disconnected channel connection ends of two adjacent semi-disconnected channels (202) are staggered vertically.

6. A superconducting shielding layer connection assembly for a single-core superconducting cable terminal according to claim 3, characterized in that: The lead-out conductor (2) is a conical sleeve. The inner circumferential surface of the lead-out conductor (2) is smooth and has the same taper as the outer circumferential surface. The circumferential surface of the plug-in part (301) is smooth and is adapted to the inner circumferential surface of the lead-out conductor (2).

7. A superconducting shield connection assembly for a single core structure superconducting cable termination according to claim 3, wherein: The threaded sleeve (4) is cylindrical in shape. The upper part of the threaded sleeve (4) is the threaded sleeve body (401) and the bottom is an annular abutment platform (402). The inner diameter of the annular abutment platform (402) is smaller than the inner diameter of the threaded sleeve body (401) and the outer diameter of the lower end of the lead conductor (2). The inner circumferential surface of the threaded sleeve body (401) is an internally threaded cylindrical surface (40101) that is adapted to the outer circumferential surface of the second sleeve (102).

8. A superconducting shield connection assembly for a single core structure superconducting cable termination according to claim 7, characterized in that: The outer circumferential surface of the threaded sleeve body (401) is provided with a plurality of screw-in grooves (40102) along the axial direction. The screw-in grooves (40102) are used to cooperate with a rotating tool to realize the rotation of the threaded sleeve (4).

9. A superconducting shield connection assembly for a single core structure superconducting cable termination according to claim 2, wherein: The connecting part (302) is used for grounding or electrical connection with the superconducting shielding layer of other phase superconducting cables. The connecting part (302) is a prefabricated superconducting strip or soft copper conductor. The superconducting shielding layer is welded to the outer circumferential surface of the first sleeve (101) to realize the electrical connection between the superconducting shielding layer and the first sleeve (101).

10. A method for connecting a superconducting shield layer of a single-core structure superconducting cable termination using the superconducting shield layer connection assembly for a single-core structure superconducting cable termination according to any one of claims 1 to 9, characterized in that Specifically, the cable core is first inserted into the first sleeve (101), and the superconducting shielding layer is electrically connected to the outer circumferential surface of the first sleeve (101). Then, the upper end of the lead conductor (2) is inserted into the second sleeve (102), and the upper end of the threaded sleeve (4) is screwed onto the outer circumferential surface of the second sleeve (102). The insertion part (301) of the connector conductor (3) is inserted into the lead conductor (2). Then, the threaded sleeve (4) is rotated so that the threaded sleeve (4) is screwed into place. The threaded sleeve (4) is attached to the outer circumferential surface of the second sleeve (102), and during the movement of the threaded sleeve (4) relative to the second sleeve (102), it pushes the lead conductor (2) to move into the second sleeve (102) and radially squeezes the lead conductor (2), so that the lead conductor (2) hugs the insertion part (301) of the connector conductor (3), so as to achieve close contact between the second sleeve (102), the lead conductor (2) and the connector conductor (3), and to achieve electrical connection between the superconducting shielding layer and the connector conductor (3).

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