Superconductor joint for a stellarator, superconductor connection structure and method for forming the same

Abstract

The application provides a superconducting conductor joint of a stellarator, a superconducting conductor connecting structure and a forming method thereof, the superconducting conductor joint comprising a clamping module and a locking sleeve; at least one slot adapted to the connecting end of the superconducting conductor is formed at one end of the clamping module, the clamping module is formed by two clamping parts which are symmetrical to each other and are butted to each other, and the slot is located at the position where the two clamping parts are butted to each other; the locking sleeve is sleeved on the outer periphery of the clamping module through a distributed locking mechanism, the locking sleeve applies a constant pressure locking force to the outer periphery of the clamping module through the distributed locking mechanism, so that the inner wall of the slot and the outer wall surface of the connecting end of the corresponding superconducting conductor are tightly attached together. The split structure of the clamping module is convenient for disassembly and assembly, the clamping module is uniformly applied with the constant pressure locking force by the extrusion of the distributed locking mechanism, the integrity of the structures of the superconducting conductor joint is not damaged in the operation process, and the superconducting conductor joint can be repeatedly used for multiple times.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of superconducting cables, and particularly relates to a superconducting conductor joint of a stellarator, a superconducting conductor connecting structure and a forming method of the superconducting conductor connecting structure. BACKGROUND

[0002] The stellarator is an important magnetic confinement nuclear fusion experimental device, which relies on a complex three-dimensional magnetic field to realize the stable confinement of high-temperature plasma. Compared with the tokamak, the stellarator has better steady-state operation potential and lower current driving demand in theory, and therefore has important significance in international fusion energy research. In the magnet system of the stellarator, the local conductor joint often needs to be replaced or disassembled during the construction, debugging and maintenance of the device, so the design of the joint needs to ensure low contact resistance to reduce the thermal load and realize detachability to facilitate maintenance and replacement. The superconducting conductor joint in the prior art is mostly in the form of integral compression or welding, which can obtain low contact resistance, but is difficult to disassemble and has poor reusability, and cannot meet the flexible requirements in the complex magnet system. SUMMARY

[0003] The application aims to solve the problem that the superconducting conductor joint in the prior art is mostly in the form of integral compression or welding, which is difficult to disassemble and has poor reusability.

[0004] To solve the above technical problems, the application discloses a superconducting conductor joint of a stellarator, which comprises a clamping module and a locking sleeve. The clamping module is in the form of a column as a whole, one end of the clamping module is provided with at least one insertion slot which is adapted to the connecting end of the superconducting conductor, and the other end is connected with the plugboard of the stellarator. A cooling channel extending along the axial direction of the clamping module is arranged around each insertion slot. The clamping module is formed by two clamping parts which are symmetrical to each other and are butted against each other, and the insertion slot is located at the position where the two clamping parts are butted against each other. The locking sleeve is sleeved on the outer periphery of the clamping module through a distributed locking mechanism, and the locking sleeve applies a constant pressure locking force to the outer periphery of the clamping module through the distributed locking mechanism, so that the inner wall of the insertion slot and the outer wall of the connecting end of the corresponding superconducting conductor are tightly attached together.

[0005] The connection end of the superconducting conductor can be inserted into the slot of the clamping module and tightly connected with the clamping module to realize electrical connection, and then connected with the plugboard of the stellarator to transmit current. The cooling channel is used to circulate cooling liquid to cool the superconducting conductor, thereby reducing the problem of overheating of the superconducting conductor joint and performance degradation or failure. The clamping module is arranged in a structure formed by the butt joint of two clamping parts symmetrical to each other, and the slot is located at the butt joint of the two clamping parts. This split structure is convenient for disassembly and assembly. When assembling, the main part of the joint can be assembled by simply butt joining the two clamping parts. The locking sleeve is used to uniformly apply constant pressure locking force to the outer periphery of the clamping module in a manner of extruding the distributed locking mechanism, so that the slot is tightly combined with the outer wall of the superconducting conductor to realize the assembly of the overall structure. When disassembling, the locking sleeve is removed to release the pressure applied by the distributed locking mechanism to the clamping module, so that the two clamping parts can be separated. The locking force applied to the clamping module by the locking sleeve and the distributed locking structure is more uniform, and the clamping module will not be irreversibly damaged during locking and unlocking, so it can be repeatedly used.

[0006] According to another specific embodiment of the present application, the superconducting conductor joint of the stellarator disclosed in the embodiments of the present application is provided. The clamping module is in a cylindrical shape and is formed by butt joint of two semicircular clamping parts symmetrical to each other. The inner wall surface of the locking sleeve is a conical surface, and the radial dimension gradually increases from one end to the other end. The distributed locking mechanism includes a plurality of annular clamping grooves, a plurality of annular clamping blocks, and a plurality of annular elastic members. The plurality of annular clamping grooves are arranged on the outer peripheral wall of the clamping module along the circumferential direction of the locking sleeve and are uniformly arranged in the axial direction of the clamping module. The plurality of annular elastic members are respectively fitted into the corresponding annular clamping grooves along the circumferential direction of the locking sleeve. The plurality of annular clamping blocks are respectively fitted into the corresponding annular clamping grooves along the circumferential direction of the locking sleeve. Each annular clamping block has a wedge-shaped cross section, and the inner side end abuts against the top surface of the corresponding annular elastic member, and the upper end protrudes from the outer peripheral surface of the clamping module. The locking sleeve moves along the axial direction of the clamping module, the inner wall surface of the locking sleeve pushes against the upper end of each annular clamping block, and the inner side end of each annular clamping block presses the top surface of the corresponding annular elastic member. Each annular elastic member applies a constant pressure circumferential locking force to the outer peripheral surface of the clamping module and locks the clamping module.

[0007] The technical scheme is adopted, the clamping module is provided as a structure in a whole cylindrical shape to ensure uniform force and avoid stress concentration. When the locking sleeve is sleeved, the end with a large radial dimension is sleeved on the clamping module first, and the end with a large radial dimension has a lower requirement for the positioning accuracy between the locking sleeve and the clamping module, so the inner wall surface of the locking sleeve is provided as a conical surface to facilitate the sleeving of the locking sleeve on the outer periphery of the clamping module. The clamping groove, the clamping block and the elastic member of the distributed locking mechanism are all provided as an annular structure matched with the clamping module, which can uniformly apply locking force to the circumference of the clamping module. Among them, the annular clamping groove provides positioning for the annular clamping block and the annular elastic member, that is, the position of the annular clamping groove is the force applying part when the constant pressure locking force is applied to the clamping module. Through the annular elastic member arranged between the annular clamping block and the annular clamping groove, when the annular clamping block extrudes the annular elastic member, the elastic force of the annular elastic member can continuously apply the circumferential locking force to the outer peripheral wall of the clamping module, and after the locking sleeve is removed, the elastic recovery force of the annular elastic member can release the locking of the clamping module, and the two half-cylindrical clamping parts are easily separated. The cross section of the annular clamping block is provided as a wedge shape to facilitate the clamping of the inner end (i.e. the smaller end) of the annular clamping block into the annular clamping groove.

[0008] According to another specific embodiment of the present application, the superconducting conductor joint of the star simulator disclosed in the embodiments of the present application, the clamping module is in a whole cylindrical shape, formed by two half-cylindrical clamping parts symmetrical to each other; the inner wall surface of the locking sleeve is a conical surface, and the radial dimension gradually increases from one end to the other end; and the distributed locking mechanism includes multiple pairs of strip-shaped clamping grooves, multiple strip-shaped clamping blocks and multiple strip-shaped elastic members; the multiple pairs of strip-shaped clamping grooves are arranged on the outer peripheral wall of the clamping module in the axial direction of the clamping module, wherein the multiple pairs of strip-shaped clamping grooves are uniformly arranged in the circumferential direction of the clamping module, and each pair of strip-shaped clamping grooves is symmetrical to each other in the radial direction of the clamping module; the multiple strip-shaped elastic members are respectively matched with a corresponding strip-shaped clamping groove in the axial direction of the locking sleeve; the multiple strip-shaped clamping blocks are respectively matched with a corresponding strip-shaped clamping groove in the axial direction of the locking sleeve; wherein the cross section of each strip-shaped clamping block is wedge-shaped, the inner end abuts against the top surface of the corresponding strip-shaped elastic member, and the upper end protrudes from the outer peripheral surface of the clamping module; and the locking sleeve moves in the axial direction of the clamping module, the inner wall surface of the locking sleeve pushes against the upper end of each strip-shaped clamping block, the inner end of each strip-shaped clamping block presses the top surface of the corresponding strip-shaped elastic member, each strip-shaped elastic member applies a constant pressure axial locking force to the outer peripheral surface of the clamping module and locks the clamping module.

[0009] The technical scheme is adopted, the clamping module is arranged in a cylindrical shape to ensure uniform stress and avoid stress concentration. The end with a large radial dimension of the locking sleeve is first sleeved on the clamping module, and the end with a large radial dimension has a low requirement for the positioning accuracy between the locking sleeve and the clamping module, so the inner wall surface of the locking sleeve is arranged as a conical surface to facilitate the sleeving of the locking sleeve on the outer periphery of the clamping module. The clamping groove, the clamping block and the elastic member of the distributed locking mechanism are all arranged in a strip shape extending along the axial direction of the clamping module, which can ensure that the locking force is uniformly applied to the axial direction of the clamping module. The plurality of pairs of strip-shaped clamping grooves are arranged uniformly in the circumferential direction of the clamping module, which can also ensure that the locking force is uniformly applied to the circumferential direction of the clamping module. The strip-shaped clamping groove provides positioning for the strip-shaped clamping block and the strip-shaped elastic member, that is, the position of the strip-shaped clamping groove is the force applying part when the constant pressure locking force is applied to the clamping module. The strip-shaped elastic member is arranged between the strip-shaped clamping block and the strip-shaped clamping groove, and when the strip-shaped clamping block extrudes the strip-shaped elastic member, the elastic force of the strip-shaped elastic member can continuously apply an axial locking force to the outer peripheral wall of the clamping module, and the elastic restoring force of the strip-shaped elastic member can separate the strip-shaped elastic member from the outer peripheral wall of the clamping module after the locking sleeve is removed. The cross section of the strip-shaped clamping block is arranged in a wedge shape to facilitate the clamping of the inner end (i.e., the smaller end) of the strip-shaped clamping block into the strip-shaped clamping groove.

[0010] According to another specific embodiment of the present application, the superconducting conductor joint of the stellarator disclosed by the embodiments of the present application comprises a clamping module, a metal core body and a metal armor.

[0011] The metal core body utilizes its good electrical conductivity to transmit current between the superconducting conductors or between the superconducting conductors and the busbar of the stellarator. The metal armor wrapped around the outer periphery of the metal core body protects the metal core body.

[0012] According to another specific embodiment of the present application, the superconducting conductor joint of the stellarator disclosed by the embodiments of the present application comprises a clamping module, a metal core body and a metal armor.

[0013] According to another specific embodiment of the present application, the superconducting conductor joint of the stellarator disclosed by the embodiments of the present application comprises a clamping module, a metal core body and a metal armor.

[0014] By adopting the technical scheme, the metal indium layer and the metal silver layer in the layered structure can be in contact with the outer circumferential surface of the superconducting conductor more uniformly on the inner wall of the slot, so that uniform constant pressure locking force is ensured to be transmitted, and the contact resistance is reduced.

[0015] According to another specific embodiment of the present application, the superconducting conductor joint of the stellarator disclosed by the embodiments of the present application is provided with external threads on the outer periphery of the locking sleeve.

[0016] By adopting the technical scheme, the external threads provided on the outer periphery of the locking sleeve facilitate the use of a tool matched with the external threads to disassemble or assemble the locking sleeve, and the self-locking performance of the threads prevents the locking sleeve from sliding.

[0017] The present application also discloses a superconducting conductor joint of a stellarator, comprising a superconducting conductor joint and a superconducting conductor of a stellarator; the connecting end portion of the superconducting conductor comprises an end portion body and an end portion armor, the end portion armor is sleeved and compressed on the outer periphery of the end portion body, and metal tin is filled between the end portion body and the end portion armor; when the locking sleeve is locked on the outer periphery of the clamping module, the inner wall of the slot is tightly attached to the outer wall surface of the corresponding end portion armor.

[0018] The present application also discloses a forming method of a superconducting conductor joint of a stellarator, which is used for forming a superconducting conductor joint of a stellarator, the superconducting conductor comprising a conductor body, a metal layer and a metal shell, the metal layer being wrapped on the outer periphery of the conductor body, and the metal shell being wrapped on the outer periphery of the metal layer; the forming method comprises the following steps: stripping the metal shell of the corresponding end portion of the conductor body, and then placing it in 50% concentrated hydrochloric acid to remove the metal layer, so as to form an end portion body; sleeving the end portion body in an end portion armor, and performing hydraulic compression treatment to compress the end portion armor on the outer periphery of the end portion body, so as to form a connecting end portion; placing the connecting end portion in a tin pool for heating and tin filling treatment, so as to fill metal tin between the end portion body and the end portion armor; abutting the two clamping portions of the clamping module to each other, and forming a slot matched with the connecting end portion at the abutting portion; respectively inserting the connecting end portion after the tin filling treatment into the corresponding slot of the clamping module; installing a distributed locking mechanism on the outer periphery of the clamping module, and sleeving a locking sleeve on the outer periphery of the clamping module through the distributed locking mechanism; moving the locking sleeve along the axial direction of the clamping module, and applying constant pressure locking force on the outer periphery of the clamping module by the distributed locking mechanism, so that the inner wall of the slot is tightly attached to the outer wall surface of the corresponding connecting end portion.

[0019] Adopting the technical scheme, the hydraulic shrinking treatment of the end body after being arranged in the end armor can make the end armor and the end body tightly contact with each other, improve the electric conduction capacity, and prevent too much tin from entering during subsequent heating and tin filling treatment to cause the problem of increased resistance, that is, appropriate tin filling treatment can make the end body and the end armor reach a good electric connection degree, and too much or too little tin filling can cause the problem of poor electric contact.

[0020] The beneficial technical effects of the present application are:

[0021] The present application provides a superconducting conductor joint of a stellarator and a superconducting conductor connecting structure of a stellarator comprising the superconducting conductor joint, the superconducting conductor joint comprising a clamping module for splicing a superconducting conductor, a locking sleeve and a distributed locking mechanism cooperating with the locking sleeve to apply a constant pressure locking force to the periphery of the clamping module, thereby locking the clamping module and the superconducting conductor. Wherein the clamping module is arranged in a structure formed by the butt joint of two clamping parts symmetrical to each other and the insertion slot is located at the butt joint of the two clamping parts, such a split structure is convenient for disassembly and assembly, and the locking force applied to the clamping module by the locking sleeve cooperating with the distributed locking structure is more uniform, and irreversible damage to the clamping module will not occur during locking and unlocking, so the clamping module can be repeatedly used.

[0022] The present application also provides a forming method of a superconducting conductor connecting structure of a stellarator, the superconducting conductor joint in the superconducting conductor connecting structure formed by the method is convenient to disassemble and can be repeatedly used, and the product loss rate is low. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structure schematic view of a specific embodiment of the superconducting conductor joint of a stellarator and the superconducting conductor of the present application for example 1 and example 2 is provided;

[0024] Figure 2 A structure schematic view of a specific embodiment of the clamping module of the superconducting conductor joint of a stellarator provided by the present application for example 1 is provided;

[0025] Figure 3 A structure schematic view of a specific embodiment of the locking sleeve and the distributed locking mechanism of the superconducting conductor joint of a stellarator provided by the present application for example 1 (the distributed locking mechanism does not include a plurality of annular clamping grooves) is provided;

[0026] Figure 4 A partial sectional view of a specific embodiment of the distributed locking mechanism and the locking sleeve of the superconducting conductor joint of a stellarator provided by the present application for example 1 is provided.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 10. A superconducting conductor connection structure;

[0029] 100. A superconducting conductor connection; 101. A clamping module; 1011. A clamping part; 1012. A slot; 1013. A cooling channel; 1014. A silver layer; 1015. A fastener; 102. A locking sleeve; 1021. An external thread; 103. A distributed locking mechanism; 1031. A ring-shaped clamping groove; 1032. A ring-shaped clamping block; 1033. A ring-shaped elastic member;

[0030] 110. A connection end of a superconducting conductor; 1101. An end body; 1102. An end armor. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0032] The superconducting conductor connection in the prior art is mostly in a whole crimping or welding manner, and has the problems of difficult disassembly and poor reusability.

[0033] Embodiment 1

[0034] In view of the above problems, the present application provides a superconducting conductor connection of a star imitator, as shown in Figure 1 and Figure 2 , comprising a clamping module 101 for inserting a superconducting conductor, the clamping module 101 is in a columnar shape as a whole, at least one slot 1012 adapted to the connection end 110 of the superconducting conductor is formed at one end of the clamping module 101, and the other end is connected with the plug-in row of the star imitator, the connection end 110 of the superconducting conductor can be inserted into the slot 1012 of the clamping module 101 along the axial direction (X direction in Figure 2 ) of the clamping module 101 and closely contact with the clamping module 101 to realize electrical connection, and then connected with the plug-in row of the star imitator to transmit current. The clamping module 101 is formed by two clamping parts 1011 which are symmetrical to each other and abutted with each other, and the slot 1012 is located at the position where the two clamping parts 1011 abut with each other, and such a split structure facilitates disassembly and assembly, and the assembly of the main part of the connection can be completed by simply abutting the two clamping parts 1011. A cooling channel 1013 extending along the axial direction of the clamping module 101 is arranged around each slot 1012, as shown in Figure 1 and Figure 2 , the cooling channel 1013 is in communication with the slot 1012, one end of the cooling channel 1013 serves as a cooling liquid input port, and the other end serves as a cooling liquid output port, and the cooling channel 1013 is used for circulating cooling liquid to cool the superconducting conductor, so as to reduce the problems of performance degradation or failure caused by overheating of the superconducting conductor connection 100. The cooling liquid can be liquid helium commonly used in the field, or liquid neon, which can be selected according to the conventional cooling requirements in the field.

[0035] It should be noted that the clamping module 101 as a whole can be cylindrical, or triangular prism, quadrangular prism, etc., as long as its extension direction is consistent with the connecting end 110 of the superconducting conductor. The clamping module 101 can be made of metal materials, such as gold, silver, copper or other materials with good electrical conductivity.

[0036] It should also be noted that the number of slots 1012 provided on the clamping module 101 can be one, two, three or more, which can be set according to the actual application scene, for example, when a single superconducting conductor needs to be connected to the power strip of the star simulator for power supply, the clamping module 101 is provided with one slot 1012. When multiple superconducting conductors need to be connected to the power strip of the star simulator for power supply, the number of slots 1012 of the clamping module 101 is determined according to the number of superconducting conductors, and the connecting end 110 of each superconducting conductor is inserted into the slot 1012 one by one, and then the other end of the clamping module 101 is connected to the power strip of the star simulator. When two or more superconducting conductors need to be connected to each other to realize current transmission between them, the number of slots 1012 is set according to the number of connecting ends 110 of the superconducting conductors to be connected, for example, when the length of a single superconducting conductor is short and two superconducting conductors need to be connected to each other to extend the transmission distance, the connecting ends 110 of the two superconducting conductors can be inserted into two slots 1012 on the same side of the clamping module 101, and the other side of the clamping module 101 can be provided with a switch to select whether to connect with the power strip. And these slots 1012 can be arranged horizontally in sequence, or uniformly spaced around the circumference of the clamping module 101, and the arrangement mode is not limited here. The cross-sectional shape of the slot 1012 can be rectangular, circular or polygonal, and the shape of the slot 1012 is determined according to the cross-sectional shape of the connecting end 110 of the superconducting conductor. For example Figure 1 and Figure 2 When the clamping module 101 is cylindrical and provided with two slots 1012 with rectangular cross-section, the two slots 1012 can be arranged radially spaced apart along the clamping module 101.

[0037] The superconducting conductor structure further comprises a locking sleeve 102, which is sleeved on the outer periphery of the clamping module 101 through a distributed locking mechanism 103. The locking sleeve 102 applies a constant pressure locking force to the outer periphery of the clamping module 101 through the distributed locking mechanism 103, so that the inner wall of the insertion slot 1012 is tightly attached to the outer wall of the connecting end 110 of the corresponding superconducting conductor. That is, on the basis of assembling the clamping module 101, a constant pressure locking force is uniformly applied to the outer periphery of the clamping module 101 by the locking sleeve 102 extruding the distributed locking mechanism 103, which ensures that the insertion slot 1012 is tightly attached to the outer wall of the connecting end 110 of the superconducting conductor, and the overall structure assembly can be realized. When disassembled, only the locking sleeve 102 needs to be removed to release the pressure applied by the distributed locking mechanism 103 to the clamping module 101, so that the two clamping parts 1011 can be separated. Moreover, the locking force applied to the clamping module 101 by the locking sleeve 102 and the distributed locking mechanism is more uniform, and the clamping module 101 will not be irreversibly damaged during locking and unlocking, so it can be repeatedly used.

[0038] Specifically, the locking sleeve 102 is located at the outermost periphery of the entire superconducting conductor joint 100. Its main function is to push and extrude the distributed locking mechanism 103 towards the clamping module, and to maintain the extrusion of the distributed locking mechanism 103 in the locked state, preventing the distributed locking mechanism 103 from detaching from the outer periphery of the clamping module 101. The locking sleeve 102 can be made of stainless steel material, specifically 316LN stainless steel, which is close to non-magnetic and has high mechanical strength to effectively protect the internal distributed locking mechanism 103 and clamping module 101.

[0039] It can be understood that the distributed locking mechanism 103 can be uniformly distributed along the circumferential direction of the clamping module 101, or uniformly distributed along the axial direction of the clamping module 101. The distributed locking mechanism 103 can specifically include a plurality of annular structures uniformly spaced along the axial direction of the clamping module 101, and each annular structure is arranged around the circumferential direction of the clamping module 101. When the locking sleeve is sleeved on the outer periphery of the clamping module 101, the pressure applied by each annular structure to the circumferential direction of the clamping module 101 is constant and uniform, and the pressure of the plurality of annular structures in the axial direction of the clamping module 101 is also constant and uniformly distributed. The distributed locking mechanism 103 can also specifically include a plurality of strip structures uniformly arranged around the circumferential direction of the clamping module 101, and each strip structure is arranged along the axial direction of the clamping module 101. When the locking sleeve is sleeved on the outer periphery of the clamping module 101, the pressure applied by each strip structure to the axial direction of the clamping module 101 is constant and uniform, and the pressure of the plurality of strip structures in the circumferential direction of the clamping module 101 is also constant and uniformly distributed.

[0040] When the locking sleeve 102 applies a constant pressure locking force to the outer periphery of the clamping module 101 through the distributed locking mechanism 103, due to the gap between the two clamping parts 1011 when they are connected, the distributed locking mechanism 103 will press the two clamping parts 1011 to make them close to each other and the gap between them is reduced, and at the same time, the gap between the insertion slot 1012 and the outer wall of the connecting end 110 of the superconducting conductor is also reduced, so that they are tightly fitted. In one embodiment of the present application, as shown in Figure 1 and Figure 2 The insertion slot 1012 is located at the middle part of the metal core, and when the clamping module 101 is in a cylindrical shape, the insertion slot 1012 is located in the radial direction of the clamping module 101. This arrangement can ensure that the distributed constant pressure locking force received by the insertion slot 1012 is always uniform, so that the outer wall of the connecting end 110 of the superconducting conductor is uniformly fitted with the inner wall of the insertion slot 1012.

[0041] Further, as shown in Figure 1 and Figure 2 Since each insertion slot 1012 is formed by two symmetrical clamping parts 1011, that is, each clamping part 1011 has a part of the insertion slot 1012 at the connection, in order to realize the modular design of the clamping part 1011 and improve the universality of parts, a cooling channel 1013 can be arranged in the area where each clamping part 1011 forms the insertion slot 1012, that is, at least one pair of cooling channels 1013 is arranged on the side of each insertion slot 1012, each pair of cooling channels 1013 is symmetrically arranged on the opposite sides of the insertion slot 1012, and each cooling channel 1013 communicates with the corresponding insertion slot 1012 and has cooling liquid flowing therein. At least one pair of cooling channels 1013 can also uniformly cool the connecting end 110 of the superconducting conductor around the circumference.

[0042] It should be noted that one pair of cooling channels 1013 can be arranged on the side of each insertion slot 1012, or two pairs, three pairs or more pairs can be arranged. The more pairs of cooling channels 1013 are arranged, the higher the cooling efficiency will be. Those skilled in the art can determine the specific number of cooling channels 1013 according to actual cooling needs.

[0043] In one embodiment of the present application, the inner wall of the insertion slot 1012 is laminated with a metal indium layer and a metal silver layer 1014. Since the outer wall of the connecting end 110 of the superconducting conductor and the inner wall of the insertion slot 1012 are in surface contact to realize electrical transmission, the layered metal indium layer and metal silver layer 1014 can more uniformly contact the outer circumferential surface of the connecting end 110 of the superconducting conductor on the inner wall of the insertion slot 1012, improve the electrical conductivity, and ensure uniform transmission of constant pressure locking force. Since the electrical conductivity of metal silver is better than that of metal indium, as shown in Figure 2As shown, the metal silver layer 1014 is arranged closer to the connecting end portion 110 of the superconducting conductor, and forms a surface contact with the connecting end portion 110 of the superconducting conductor, which can reduce the contact resistance.

[0044] In one embodiment of the present application, as shown in Figure 3 As shown, the outer periphery of the locking sleeve 102 is provided with external threads 1021, which facilitates the dismounting or mounting of the locking sleeve 102 by using a tool matched with the external threads 1021, and prevents the locking sleeve 102 from sliding by using the self-locking performance of the threads, for example, by using a wrench or other tool with internal threads.

[0045] In one embodiment of the present application, as shown in Figure 1 and Figure 2 As shown, the clamping module 101 is in a cylindrical shape as a whole, which is formed by the butt joint of two semi-cylindrical clamping portions 1011 symmetrical to each other. Arranging the clamping module 101 in a cylindrical shape as a whole ensures that it is uniformly stressed and avoids the problem of stress concentration.

[0046] Further, as shown in Figure 3 The inner wall surface of the locking sleeve 102 is in a conical surface, as shown in Figure 4 As shown, the radial (Y direction in Figure 4 ) dimension of the locking sleeve 102 gradually increases from one end to the other end in the extension direction, and the end with the larger radial dimension is first sleeved on the clamping module 101 when the locking sleeve 102 is sleeved. The end with the larger radial dimension has a lower requirement for the positioning accuracy between the locking sleeve 102 and the clamping module 101, and therefore, the inner wall surface of the locking sleeve 102 is arranged in a conical surface to facilitate the sleeving of the locking sleeve 102 on the outer periphery of the clamping module 101.

[0047] Further, as shown in Figures 2-4 The distributed locking mechanism 103 includes a plurality of annular clamping grooves 1031 and a plurality of annular clamping blocks 1032 Figure 4Only one annular clamping block 1032 and a plurality of annular elastic members 1033 are shown, and the clamping groove, clamping block and elastic member of the distributed locking mechanism 103 are all arranged in an annular structure that is adapted to the clamping module 101, which can uniformly apply locking force to the clamping module 101 in the circumferential direction. A plurality of annular clamping grooves 1031 are provided in the outer circumferential wall of the clamping module 101 in the circumferential direction of the locking sleeve 102 and are uniformly arranged in the axial direction of the clamping module 101. The annular clamping groove 1031 provides positioning for the annular clamping block 1032 and the annular elastic member 1033, i.e. the position of the annular clamping groove 1031 is the force application site when applying constant pressure locking force to the clamping module 101. It should be noted that the number of annular clamping grooves 1031 can be two, three, four or more, and the number of corresponding annular clamping blocks 1032 can be two, three, four or more; the number of corresponding annular elastic members 1033 can be two, three, four or more.

[0048] A plurality of annular elastic members 1033 are respectively fitted into corresponding annular clamping grooves 1031 in the circumferential direction of the locking sleeve 102, i.e. one annular elastic member 1033 is provided in each annular clamping groove 1031, and a plurality of annular clamping blocks 1032 are respectively fitted into corresponding annular clamping grooves 1031 in the circumferential direction of the locking sleeve 102, i.e. the outer circumference of each annular elastic member 1033 is applied with locking force to the outer circumferential wall of the clamping module 101 through the annular clamping block 1032. By providing the annular elastic member 1033 between the annular clamping block 1032 and the annular clamping groove 1031, the annular clamping block 1032 can continuously apply circumferential locking force to the outer circumferential wall of the clamping module 101 by using the elastic force of the annular elastic member 1033 when the annular clamping block 1032 presses the annular elastic member 1033, and the elastic restoring force of the annular elastic member 1033 can release the locking of the clamping module 101 when the locking sleeve 102 is removed, so that the two half-cylindrical clamping parts 1011 are easily separated.

[0049] It should be noted that the annular elastic member 1033 can be provided in a structure with a corrugated cross-section, such as a corrugated pipe, and the material can be selected from high-resilience alloys (such as Inconel, spring steel), and a corrosion-resistant layer can be plated on the surface.

[0050] The annular clamping block 1032 can be made of metal, such as stainless steel. In order to easily clamp the annular clamping block 1032 into the corresponding annular clamping groove 1031, the annular clamping block 1032 can be provided with a plurality of clamping protrusions 1034 on the outer circumferential wall, which can be easily clamped into the annular clamping groove 1031. Figure 4As shown, the cross section of each annular clamping block 1032 is wedge-shaped, with the inner end (i.e. the smaller end) abutting the top surface of the corresponding annular elastic member 1033 and the upper end protruding from the outer peripheral surface of the clamping module 101. When the locking sleeve 102 is installed, the locking sleeve 102 is moved along the axial direction of the clamping module 101, and the inner wall surface of the locking sleeve 102 pushes against the upper end (i.e. the larger end) of each annular clamping block 1032. The inner end of each annular clamping block 1032 is subjected to an external force and presses against the top surface of the corresponding annular elastic member 1033. The annular elastic member 1033 exerts a constant pressure circumferential locking force on the outer peripheral surface of the clamping module 101 and locks the clamping module 101.

[0051] In another embodiment of the present application, as shown in Figure 1 and Figure 2 the clamping module 101 is in the shape of a whole cylinder, formed by two half-cylindrical clamping portions 1011 that are symmetrical to each other. The structure of the clamping module 101 in the shape of a whole cylinder ensures that the force is uniformly distributed, avoiding the problem of stress concentration.

[0052] Further, as shown in Figure 4 the inner wall surface of the locking sleeve 102 is in the shape of a conical surface, and the radial dimension gradually increases from one end to the other end in the extension direction of the locking sleeve 102. When the locking sleeve 102 is installed, the end with the larger radial dimension is first fitted onto the clamping module 101. The end with the larger radial dimension has a lower requirement for the positioning accuracy between the locking sleeve 102 and the clamping module 101. Therefore, the inner wall surface of the locking sleeve 102 is designed in the shape of a conical surface to facilitate the fitting of the locking sleeve 102 on the outer periphery of the clamping module 101.

[0053] Furthermore, the distributed locking mechanism 103 includes multiple pairs of strip-shaped clamping grooves, multiple strip-shaped clamping blocks, and multiple strip-shaped elastic members. The clamping grooves, clamping blocks, and elastic members of the distributed locking mechanism 103 are all designed in the shape of strips extending along the axial direction of the clamping module 101, which can ensure that the locking force is uniformly applied to the axial direction of the clamping module 101. The multiple pairs of strip-shaped clamping grooves are formed in the outer peripheral wall of the clamping module 101 extending along the axial direction of the clamping module 101. The strip-shaped clamping grooves provide positioning for the strip-shaped clamping blocks and the strip-shaped elastic members, i.e. the positions of the strip-shaped clamping grooves are the force application sites when the constant pressure locking force is applied to the clamping module 101. The multiple pairs of strip-shaped clamping grooves are uniformly arranged in the circumferential direction of the clamping module 101, and each pair of strip-shaped clamping grooves is symmetrical to each other in the radial direction of the clamping module 101. This arrangement can also ensure that the locking force is uniformly applied to the circumferential direction of the clamping module 101. It should be noted that the number of strip-shaped clamping grooves can be two pairs, three pairs, four pairs, or more pairs, and the number of corresponding strip-shaped clamping blocks can be four, six, eight, or more. The number of corresponding strip-shaped elastic members can be four, six, or eight.

[0054] The plurality of strip-shaped elastic members are respectively fitted into corresponding strip-shaped clamping grooves along the axial extension of the locking sleeve 102, that is, one strip-shaped elastic member is arranged in each strip-shaped clamping groove, and the plurality of strip-shaped clamping blocks are respectively fitted into corresponding strip-shaped clamping grooves along the axial extension of the locking sleeve 102, that is, each strip-shaped clamping block is arranged on the outside of each strip-shaped elastic member and applies a locking force to the outer peripheral wall of the clamping module 101 through the strip-shaped clamping block. When the strip-shaped clamping block extrudes the strip-shaped elastic member, the strip-shaped elastic member can continuously apply an axial locking force to the outer peripheral wall of the clamping module 101 by using the elastic force of the strip-shaped elastic member, and the elastic restoring force of the strip-shaped elastic member can separate it from the outer peripheral wall of the clamping module 101 after the locking sleeve 102 is removed.

[0055] It should be noted that the strip-shaped elastic member can be provided in a corrugated structure in cross section, and the material thereof can be selected from high-resilience alloys (such as Inconel and spring steel), and a corrosion-resistant layer can be plated on the surface thereof.

[0056] The strip-shaped clamping block can be made of a metal material, such as stainless steel. In order to easily clamp the strip-shaped clamping block into the corresponding strip-shaped clamping groove, the cross section of each strip-shaped clamping block is wedge-shaped, and the inner side end (i.e., the smaller end) abuts against the top surface of the corresponding strip-shaped elastic member, and the upper end (i.e., the larger end) protrudes from the outer peripheral surface of the clamping module 101. When installing the locking sleeve 102, the locking sleeve 102 is moved along the axial direction of the clamping module 101, the inner wall surface of the locking sleeve 102 pushes against the upper end of each strip-shaped clamping block, the inner side end of each strip-shaped clamping block is pressed against the top surface of the corresponding strip-shaped elastic member, each strip-shaped elastic member applies a constant-pressure axial locking force to the outer peripheral surface of the clamping module 101 and locks the clamping module 101.

[0057] When the clamping module 101 is in a cylindrical shape, the clamping module 101 sequentially includes a metal core body and a metal armor wrapped around the outer periphery of the metal core body in the radial direction, that is, each clamping portion 1011 is composed of a part of the metal core body in a semi-cylindrical shape and a part of the metal armor in a tile shape. When the two clamping portions 1011 are combined together, the entire metal core body is in a cylindrical shape, and the entire metal armor is in a cylindrical shape wrapped around the outer periphery of the metal core body. The metal core body transmits current between superconducting conductors or between the superconducting conductors and the busbar of the simulator by using its good conductivity. The metal armor wrapped around the outer periphery of the metal core body protects the metal core body.

[0058] It should be noted that the metal core can be made of oxygen-free copper material, the metal armor can be made of stainless steel material, and the two are connected by brazing, or can be a split structure, and when installing, the metal armor and the metal core are pre-tightened by the fastener 1015, and then the constant pressure locking force is applied by the locking sleeve 102 to make the two tightly fit. The outer periphery of the metal armor can also be covered with a buffer layer.

[0059] Embodiment 2

[0060] The application also provides a superconducting conductor connection structure of a stellarator, which comprises the superconducting conductor joint 100 provided in Embodiment 1 and a superconducting conductor of a stellarator. Figure 1 As shown in the figure, the superconducting conductor of the stellarator comprises a connection end portion 110 of the superconducting conductor, and the connection end portion 110 of the superconducting conductor comprises an end portion body 1101 and an end portion armor 1102, and the end portion armor 1102 is sleeved and tightly pressed on the outer periphery of the end portion body 1101. When the locking sleeve 102 is locked on the outer periphery of the clamping module 101, the inner wall of the slot 1012 is tightly attached to the outer wall surface of the corresponding end portion armor 1102. It should be noted that the end portion body 1101 can be cylindrical, prismatic or other shapes, and the end portion armor 1102 can be cylindrical, prismatic or other shapes, as long as it covers the outer periphery of the end portion body 1101 to form protection. The end portion body 1101 and the end portion armor 1102 are filled with metal tin to improve the electrical conductivity.

[0061] Embodiment 3

[0062] The application also provides a forming method of a superconducting conductor connection structure of a stellarator, which is used to form the superconducting conductor connection structure of a stellarator provided in Embodiment 2. The superconducting conductor comprises a conductor body, a metal layer and a metal shell, the metal layer covers the outer periphery of the conductor body, and the metal shell covers the outer periphery of the metal layer. The metal layer and the metal shell can protect the conductor body from mechanical damage and reduce electromagnetic interference, but at the joint connection, the metal layer and the metal shell need to be removed to better realize electrical contact. Therefore, the forming method of the superconducting conductor connection structure of a stellarator first comprises: stripping the metal shell of the corresponding end portion of the conductor body, and the metal shell is usually made of stainless steel or aluminum alloy material. After stripping the metal shell, it is placed in 50% concentrated hydrochloric acid to remove the metal layer, thereby exposing the conductor body to form an end portion body.

[0063] Next, the end portion body is inserted into the end portion armor, and hydraulic shrinking treatment is performed to tightly press the end portion armor on the outer periphery of the end portion body to form a connection end portion. After the end portion body is inserted into the end portion armor, the hydraulic shrinking treatment can make the end portion armor tightly contact the outer periphery of the end portion body, improve the electrical conductivity, and also prevent too much tin from entering during subsequent heating and tin filling treatment to cause the problem of increased resistance.

[0064] Further, the connecting end portion is placed in a tin pool for heating and tin filling treatment, so that the tin fills between the end portion body and the end portion armor, and proper tin filling treatment can achieve good electrical connection between the end portion body and the end portion armor, and too much or too little tin filling can cause poor electrical contact. The specific treatment method can be that the connecting end portion is placed in a tin pool filled with molten low-temperature solder for tin filling treatment, and the low-temperature solder used is Ag-Pb solder with a melting point of 183°C.

[0065] In the assembly stage, the two clamping portions of the clamping module are butted against each other, and a slot adapted to the connecting end portion is formed at the butt joint position, and the connecting end portion after the tin filling treatment is inserted into the corresponding slot of the clamping module.

[0066] The distributed locking mechanism is installed on the outer periphery of the clamping module, and when the locking sleeve is sleeved on the outer periphery of the clamping module, the locking sleeve cooperates with the distributed locking mechanism to apply a constant pressure locking force to the outer periphery of the clamping module. In one specific embodiment, when the distributed locking mechanism includes a plurality of annular clamping grooves, a plurality of annular clamping blocks and a plurality of annular elastic members, the annular elastic members are first placed in the corresponding annular clamping grooves, then the annular clamping blocks are installed, and then the locking sleeve is moved along the axial direction of the clamping module, the locking sleeve pushes against the annular clamping blocks and the annular elastic members, and a constant pressure locking force is applied to the outer periphery of the clamping module in the circumferential direction, so that the inner wall of the slot and the outer wall surface of the connecting end portion of the corresponding superconducting conductor are tightly attached together, and finally a complete superconducting conductor connection structure of the stellarator is formed.

[0067] It should be noted that in addition to the embodiments of the application described above, other advantages and effects of the application can be easily understood by those skilled in the art from the disclosure. Although the description of the application is introduced in combination with the preferred embodiments, it does not mean that the features of the application are limited to the embodiments. On the contrary, the purpose of introducing the application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the application. In order to provide a deep understanding of the application, many specific details will be included in the following description. The application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the application, some specific details will be omitted in the description. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

[0068] It should be noted that in this specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0069] In the description of the present embodiment, it needs to be explained that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0070] The terms "first", "second", and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0071] In the description of the present embodiment, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0072] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood that the above description is a further detailed explanation of the present application in connection with the specific embodiments, and cannot be considered as limiting the specific implementation of the present application. Those skilled in the art can make various changes in form and details, including making a number of simple deductions or substitutions, without departing from the spirit and scope of the present application.

Claims

1. A superconducting conductor joint for a stellarator, characterized by, The application relates to a superconducting conductor joint and a superconducting conductor thereof. The clamping module is in a whole cylindrical shape, one end of the clamping module is provided with at least one insertion slot matched with the connecting end of the superconducting conductor, the other end is connected with the plugboard of the star simulator; and a cooling channel extending along the axial direction of the clamping module is arranged around each insertion slot; wherein the clamping module is formed by two half-cylindrical clamping parts which are symmetric to each other and are butted to each other, the insertion slot is located at the position where the two clamping parts are butted to each other; and The locking sleeve is sleeved on the outer periphery of the clamping module through a distributed locking mechanism, the locking sleeve applies a constant pressure locking force to the outer periphery of the clamping module through the distributed locking mechanism, so that the inner wall of the insertion slot and the outer wall surface of the connecting end of the superconducting conductor are tightly attached together. The inner wall surface of the locking sleeve is a conical surface, and the radial dimension gradually increases from one end to the other end. The distributed locking mechanism comprises a plurality of annular clamping grooves, a plurality of annular clamping blocks and a plurality of annular elastic members. The plurality of annular clamping grooves are arranged on the outer peripheral wall of the clamping module and are uniformly arranged in the axial direction of the clamping module. The plurality of annular elastic members are respectively matched with one corresponding annular clamping groove. The plurality of annular clamping blocks are respectively matched with one corresponding annular clamping groove; wherein the cross section of each annular clamping block is wedge-shaped, the inner side end abuts against the top surface of the corresponding annular elastic member, and the upper end protrudes from the outer peripheral surface of the clamping module. The locking sleeve moves along the axial direction of the clamping module, the inner wall surface of the locking sleeve pushes against the upper end of each annular clamping block, the inner side end of each annular clamping block presses the top surface of the corresponding annular elastic member, each annular elastic member applies a constant pressure circumferential locking force to the outer peripheral surface of the clamping module and locks the clamping module.

2. The superconducting conductor joint of a stellarator of claim 1, wherein, The clamping module sequentially comprises a metal core body and a metal armor covering the outer periphery of the metal core body in the radial direction. The metal core body is in a cylindrical shape, and the metal armor is in a cylindrical shape sleeved on the outer periphery of the metal core body.

3. The superconducting conductor joint of a stellarator of claim 2, wherein, The insertion slot is located at the middle part of the metal core body, at least one pair of cooling channels are arranged on the periphery of each insertion slot, each pair of cooling channels are symmetrically arranged on the opposite peripheries of the insertion slot, and each cooling channel communicates with the corresponding insertion slot and internally flows with cooling liquid.

4. The superconducting conductor joint of a stellarator of claim 1, wherein, The inner wall of the insertion slot is laminated with a metal indium layer and a metal silver layer, wherein the metal silver layer forms a surface contact with the connecting end of the superconducting conductor.

5. The superconducting conductor joint of a stellarator of claim 1, wherein, The outer periphery of the locking sleeve is provided with external threads.

6. A superconducting conductor connection structure for a stellarator, characterized in that, The application relates to a superconducting conductor joint and a superconducting conductor thereof. The connecting end of the superconducting conductor comprises an end body and an end armor, the end armor is sleeved and compressed on the outer periphery of the end body, and metal tin is filled between the end body and the end armor. The inner wall of the slot is tightly attached to the outer wall of the corresponding end armor when the locking sleeve is locked on the outer periphery of the clamping module.

7. A method for forming a superconducting conductor connection structure of a stellarator, for forming the superconducting conductor connection structure of the stellarator according to claim 6, the superconducting conductor comprising a conductor body, a metal layer, and a metal case, the metal layer being coated on an outer periphery of the conductor body, the metal case being coated on an outer periphery of the metal layer; characterized by, The forming method comprises the following steps: The metal shell of the corresponding end of the conductor body is stripped and then placed in 50% concentrated hydrochloric acid to remove the metal layer to form an end body; The end body is inserted into an end armor and is subjected to hydraulic size reduction treatment to make the end armor tightly press on the outer periphery of the end body to form a connecting end; The connecting end is placed in a tin pool for heating and tin filling treatment to make the metal tin filled between the end body and the end armor; Two clamping parts of the clamping module are butted against each other to form a slot adapted to the connecting end at the butt joint part; The connecting end subjected to the tin filling treatment is respectively inserted into the corresponding slot of the clamping module; A distributed locking mechanism is installed on the outer periphery of the clamping module, and the locking sleeve is sleeved on the outer periphery of the clamping module through the distributed locking mechanism; The locking sleeve is moved along the axial direction of the clamping module, and the locking sleeve applies a constant pressure locking force on the outer periphery of the clamping module through the distributed locking mechanism to make the inner wall of the slot tightly attached to the outer wall of the corresponding connecting end.

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