Device for soldering of CORC high-temperature superconducting cable copper-packaged connector

Abstract

The present invention relates to the technical field of superconducting electricians, and in particular provides a device for soldering of a CORC high-temperature superconducting cable copper-packaged connector. The device comprises: a base body, provided with a mounting space; a heating portion, which can be arranged in the mounting space and is provided with a heating space capable of accommodating a cable connector copper tube; and a heat exchange portion, removably arranged on the heating portion. By means of such a structure, rapid cooling of the heating portion can be achieved by means of the introduction of the heat exchange portion. On the basis, while the device for soldering of the CORC high-temperature superconducting cable copper-packaged connector is expected to achieve cable connector soldering, the safety and timeliness of a cooling stage in the soldering process are guaranteed, and then it is guaranteed that the physical characteristics of superconducting strips in a CORC high-temperature superconducting cable can be damaged as little as possible during soldering.

Description

Device for welding copper encapsulated joints of CORC type high-temperature superconducting cables Technical Field

[0001] The invention belongs to the technical field of superconducting electrical engineering, and specifically provides a device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables. Background Art

[0002] The structure of a CORC (superconducting conductor on round core) high-temperature superconducting cable is generally as follows: a metal rod (such as a copper rod) serves as a central support, around which a superconducting tape (such as yttrium barium copper oxide superconducting material) is wound, forming the CORC cable. The resistance of the superconducting tape approaches zero at the critical current, allowing each tape to carry currents of hundreds of amperes. Therefore, the current carrying capacity of the CORC cable can be increased by wrapping as many superconducting tapes as possible around the copper rod, resulting in a CORC cable with a high current density. CORC cables, with their ultra-high current density and higher operating temperature compared to traditional low-temperature superconducting cables, are widely used in applications requiring high currents and strong magnetic fields.

[0003] Since the current flowing through a CORC-type high-temperature superconducting cable is the result of the parallel addition of multiple superconducting tapes, in practical applications, the multiple superconducting tapes at the cable ends must be welded together to achieve a parallel stacking effect. Copper-encapsulated cable joints are widely accepted and used in the current superconducting electrical field. The basic method for achieving a copper-encapsulated cable joint is to load solder into a copper tube; heat the solder to a liquid state; insert the cable end into the solder-filled copper tube to seal it; and after cooling, the solder welds the multiple superconducting tapes contained within the cable together. Because YBCO superconducting materials are sensitive to external factors such as mechanical stress and temperature, designing a welding device specifically for CORC-type high-temperature superconducting cables to achieve this joint while minimizing damage to the physical properties of the superconducting tapes is both necessary and requires improvement.

[0004] Summary of the Invention

[0005] For CORC high-temperature superconducting cables, the welding process for cable joints primarily involves two phases: heating and cooling. While the heating technology involved in the heating phase is relatively mature and controllable, natural cooling is currently the most common method for cooling during the welding process. However, developing efficient cooling methods presents technical challenges. For example, the melting point of low-temperature solder is approximately 180°C to 200°C. The entire welding process is completed only when the welding equipment cools down from a high temperature of over 180°C to room temperature.

[0006] If natural cooling is used, it will inevitably take a long time and there may be significant safety hazards during the cooling process. For example, the long cooling time may cause injury to experimenters due to accidental contact; each layer of superconducting tape needs to be fixed with insulating tape (e.g., 3mm) after winding. The cable end is located at the end of the insulating tape. The end is exposed to high-temperature liquid solder for a long time, so the tape viscosity may decrease and become loose, thereby affecting the weld structure. Therefore, the present invention mainly starts with the cooling process of the device used for welding, seeking to at least to some extent solve the safety and timeliness issues related to the cooling system.

[0007] In view of this, the present invention provides a device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables, the device comprising: a base body, which is formed with an installation space; a heating part, which can be arranged in the installation space and is formed with a heating space capable of accommodating the copper tube of the cable joint; and a heat exchange part, which is removably arranged on the heating part.

[0008] With this configuration, it is possible to achieve rapid cooling of the heating portion by introducing the heat exchange portion.

[0009] It is understandable that those skilled in the art can determine the specific form of the heat exchange part, the specific method of introducing / removing the heat exchange part from the heating part, etc. according to actual needs.

[0010] Regarding the above-mentioned device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables, in a possible implementation manner, the heat exchange portion includes a heat exchange tube, and the heat exchange tube is sleeved on an outer wall of the heating portion.

[0011] With this configuration, it is possible to achieve rapid cooling of the heating portion through the circulation of the cooling medium in the heat exchange tubes.

[0012] For the above-mentioned device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables, in one possible embodiment, the diameter of the heat exchange tube is a value between 2-3 mm; and / or the wall thickness of the heat exchange tube is a value between 0.2-0.3 mm; and / or the heat exchange tube is a rigid body with a spiral structure made of a heat-conductive material.

[0013] This configuration provides a possible structural form of the heat exchange tube.

[0014] For the above-mentioned device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables, in a possible implementation, the base includes a support base and a first cylindrical structure, and the first cylindrical structure and the support base form the installation space.

[0015] This configuration provides a possible structural form of the base body.

[0016] For the above-mentioned device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables, in one possible embodiment, the base includes a second tubular structure, which is arranged radially outside the first tubular structure, and in the assembled state, at least a portion of the heating part can be freely accommodated inside the first tubular structure.

[0017] With this configuration, the heating portion can be effectively protected by the first tubular structure.

[0018] For the above-mentioned device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables, in one possible embodiment, the radial dimension of the inner wall of the second tubular structure is 1.8-2 times the radial dimension of the heating portion along the inner wall of the second tubular structure; and / or the wall thickness of the second tubular structure is a value between 8-10 mm.

[0019] This configuration provides possible structural forms of the second cylindrical structure and the heating portion in the base.

[0020] For the above-mentioned device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables, in one possible embodiment, the axial dimension of the second tubular structure is 70-80% of the axial dimension of the heating portion along the second tubular structure; and / or the axial dimension of the first tubular structure is 30-40% of the axial dimension of the heating portion along the first tubular structure.

[0021] This configuration provides possible structural forms of the first / second cylindrical structure and the heating portion in the base.

[0022] For the above-mentioned device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables, in a possible implementation, the heating portion includes a plurality of heating parts, and the plurality of heating parts form the heating space in an assembled state.

[0023] This configuration provides a possible structural form of the heating unit.

[0024] It is understood that those skilled in the art can determine the structure and number of the heating parts and the specific method of forming the heating space by multiple heating parts according to actual needs. For example, the multiple heating parts can be connected when forming the heating space or placed in a manner such as simply abutting each other.

[0025] For the above-mentioned device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables, in one possible embodiment, the multiple heating parts include a first heating part and a second heating part, and the first heating part and the second heating part form a heating part of a cylindrical structure in an assembled state.

[0026] Through such a configuration, a specific combination of multiple heating parts is provided.

[0027] For the above-mentioned device for welding CORC-type high-temperature superconducting cable copper-encapsulated joints, in one possible embodiment, the outer edge of the cross-section of the heating portion is circular, the inner edge of the cross-section of the heating portion is non-circular, and the cable joint copper tube can abut against a portion of the inner edge.

[0028] This structure can ensure the abutment reliability of the cable joint copper tube, such as the inner edge being a polygon, a special-shaped structure, or a structure composed of two arcs smaller than a semicircle.

[0029] Additional aspects and advantages of the present invention will be set forth in part in the following description, will be obvious from the following description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] FIG1 is a schematic structural diagram of a device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables according to an embodiment of the present invention;

[0032] FIG2 is an exploded schematic diagram of a device for welding a copper-encapsulated joint of a CORC high-temperature superconducting cable according to an embodiment of the present invention;

[0033] FIG3 is a schematic cross-sectional view of a device for welding a copper-encapsulated joint of a CORC high-temperature superconducting cable according to an embodiment of the present invention (excluding heat exchange tubes);

[0034] FIG4 is a schematic structural diagram of a base body in a device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables according to an embodiment of the present invention; and

[0035] FIG5 is a schematic structural diagram (explosion) showing a heating portion in a device for welding a copper-encapsulated joint of a CORC type high-temperature superconducting cable according to an embodiment of the present invention.

[0036] In the attached figure:

[0037] 100. Device for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables;

[0038] 11. First cylindrical structure; 12. Second cylindrical structure; 13. Support base; 14. Handle; 15. Installation chamber;

[0039] 2. Heating unit;

[0040] 21. First heating part;

[0041] 211, first heating terminal through hole; 212, temperature measurement terminal through hole;

[0042] 22. Second heating part;

[0043] 221, second heating terminal through hole;

[0044] 23. Heating chamber;

[0045] 3. Heat exchange tube. DETAILED DESCRIPTION

[0046] In addition, to better illustrate the present invention, numerous specific details are provided in the following detailed description. Those skilled in the art will appreciate that the present invention can be practiced without some of these details. In some instances, CORC-type high-temperature superconducting cables, cable connector structures, and conductive principles, which are well known to those skilled in the art, are not described in detail in order to highlight the main points of the present invention.

[0047] Mainly referring to Figures 1 to 3, in one possible embodiment, the device 100 for welding copper-encapsulated joints of superconducting CORC cables mainly includes a base 1, a heating part 2 and a heat exchange part. In this example, the heating part includes a first heating part 21 and a second heating part 22. The base 1 is mainly used to install and support the structure including the heating part and the heat exchange tube. The heating part is mainly used to provide the heat radiation required for the welding process. The heat exchange part is mainly used to achieve rapid cooling of the joint after welding is completed by means of heat exchange between the cooling medium and the heating part, thereby effectively avoiding timeliness and safety issues caused by excessive cooling time. In this example, the heat exchange part includes a heat exchange tube 3, a circulating pump configured on the heat exchange tube, and a cooling medium that can flow through the heat exchange tube.

[0048] Continuing to refer to Figures 1 to 3 and mainly to Figure 4, in one possible embodiment, the base 1 mainly includes a first tubular structure 11, a second tubular structure 12 located outside the first tubular structure, and a support base 13. For example, the first tubular structure and the second tubular structure can be fixedly connected by welding or integrally formed on the support base 13, wherein the first tubular structure 11 and the support base form an installation cavity 15 adapted to the bottom of the heating unit, such as the heating unit can be embedded in the installation cavity. The height of the second tubular structure 12 along its axial direction needs to be close to the height of the heating unit so that it can surround most of the heating unit therein, thereby protecting the heating unit.

[0049] In this example, the support base 13 is a disk-shaped structure with a radius slightly larger than the outer radius of the cross section of the second cylindrical structure and a certain thickness to ensure the stability of the device. For example, the radius of the disk-shaped structure is 90 mm and the thickness is 10 mm.

[0050] For example, the base is made of a high-strength metal material (such as copper), wherein the chamber formed by the second tubular structure and the support base is mainly used to place the heating part and the heat exchange tube during operation, so the volume of the chamber should be as large as possible to ensure that interference does not occur or to avoid the difficulty of assembly caused thereby. Taking into account the high strength requirements and safety requirements of the support function, the diameter of the cross section of the chamber is generally 1.8-2 times the diameter of the heating part, the height is generally 70-80% of the height of the heating part, and the wall thickness is generally 8-10 mm. If the second tubular structure surrounds 70-80% of the heating part in the height direction, it has basically played an effective protective role. If the second tubular structure is higher (such as the same height as the heating part), the operating space is small, which will be unfavorable for removing the cable end cable connector copper tube after the welding work is completed. In other words, the 20-30% excess that leaks out can be smoothly clamped with pliers to the cable connector copper tube and removed from the heating space.

[0051] As in this example, two handles are arranged on the outer wall of the first cylindrical structure in a tangentially welded manner to facilitate the movement and placement of the device. The support base is a solid metal disc with a diameter slightly larger than the diameter of the second cylindrical structure. It mainly serves to reinforce and support the entire device. The second cylindrical structure is concentrically welded to the support base. The first cylindrical structure is located at the bottom of the second cylindrical structure and is concentrically welded to the support base. The height is generally 30-40% of the height of the heating cylinder. When working, the heating part of the hollow cylinder needs to be embedded in the installation space to achieve the fixation of the heating part on the base. The height of the first cylindrical structure must first ensure a certain height to ensure that the heating part is stably supported in the installation space formed by it and the support base. Under this premise, the height of the first cylindrical structure is lower than that of the second cylindrical structure, and the heat generated by the heating part can be smoothly radiated to the soldering, thereby ensuring the heat radiation quality of the welding operation.

[0052] In one possible embodiment, an operating end is provided on the second cylindrical structure. The main function of the operating end is to facilitate movement of the device. In this example, the operating end is a handle 14 provided on the outer wall of the second cylindrical structure. In a specific example, the handle 14 includes two handles, such as two handles symmetrically welded to the outer wall of the second cylindrical structure 12 along the circumferential direction.

[0053] Continuing to refer to Figures 1 to 3 and mainly to Figure 5, in one possible embodiment, the contour structures of the first heating portion 22 and the second heating portion 22 are roughly the same and are both semi-cylindrical structures (hollow semi-cylinders) and thus constitute a heating portion of a cylindrical structure whose outer wall surface is adapted to the installation chamber of the aforementioned columnar structure.

[0054] In one possible embodiment, the first heating portion 21 is provided with a first heating terminal through-hole 211 and a temperature measuring terminal through-hole 212 extending along its axial direction near its two ends. The first heating terminal through-hole 211 is primarily used to connect to an external heating source to heat the entire welding device, while the temperature measuring terminal through-hole 212 is connected to an external heating source to display the real-time temperature. The second heating portion 22 is provided with a second heating terminal through-hole 221 only at a position corresponding to the first heating terminal through-hole 211, which functions substantially the same as the first heating terminal through-hole 221.

[0055] For example, the main body of the (first and second) heating parts is made of two high-purity semi-cylindrical aluminum blocks, each of which has a through-hole with a semicircular cross-section corresponding to the heating space and matching the size of the cable connector copper tube. In this way, when the two aluminum blocks are combined, the cable connector copper tube can be placed and fixed in the through-hole (heating space) with a circular cross-section formed by the two aluminum blocks. A through-hole (first / second heating terminal through-hole) with a length of approximately 70-80% of the aluminum block height is drilled in each aluminum block for inserting a heating component such as a dry-burning electric heating rod to heat the aluminum block. A through-hole (temperature measurement terminal through-hole) with a length of approximately 30-40% of the aluminum block height can be drilled in one of the aluminum blocks for inserting an armored thermocouple, etc., to monitor the real-time temperature of the aluminum block. By connecting the heating rod and thermocouple to an external controller, the two aluminum blocks can be heated by controlling the operating parameters of the heating rod. The heated aluminum blocks transfer heat to the copper tube of the cable joint, melting the solder into a liquid state. After that, the end of the CORC high-temperature superconducting cable is inserted into the solder to achieve the welding of the cable joint.

[0056] Obviously, the above-described configuration of the heating unit is merely an exemplary description. Those skilled in the art can flexibly adjust the configuration of the first and second heating units and the configuration of the heating units according to actual needs. Furthermore, the number of heating units can also be adjusted based on actual needs. For example, multiple heating terminal through-holes are provided on the first and second heating units.

[0057] For example, the outer radius of the cross section of the first heating part 21 and the second heating part 22 is 40mm, and the inner radius is roughly the same as the size of the cable connector copper tube, such as 20mm. The apertures of the first / second heating terminal through holes and the temperature measuring terminal through holes are roughly the same (such as the apertures are both 2mm), the depths of the first / second heating terminal through holes are roughly the same (such as the depths are both 70mm), and the depth of the temperature measuring terminal through holes is smaller (such as 40mm). In this way, the shorter temperature measuring rod located at the upper part of the heating part can more accurately reflect the temperature of the heating part. The heights of the first heating part 21 and the second heating part 22 are roughly the same, such as both are 90mm, the height of the second tubular structure 12 is 70mm, the outer radius of the cross section of the second tubular structure is 70mm, and the wall thickness is 10mm (i.e., the inner radius is 60mm); the heating part 2 is embedded in the installation space 15 of the columnar structure formed by the first tubular structure 11 and the support base 13, so the inner radius of the first tubular structure 11 should match the outer radius of the cross section of the heating part 2. In this example, the inner radius of the cross section of the first cylindrical structure 11 is 40 mm. In addition, the wall thickness of the first cylindrical structure 11 is 2 mm, and the height is 20 mm.

[0058] In this way, the cable joint copper tube to be heated is placed in the heating chamber 23 formed by the (first and second) heating parts, and the cable joint copper tube is clamped by the cooperation of the (first and second) heating parts and the installation chamber 15.

[0059] In a preferred embodiment, the outer circle of the cross-section of the first / second heating portion is approximately a full semicircle, while the inner circle is smaller than the full semicircle (i.e., there is a certain distance between the centers of the outer and inner circles. According to the orientation shown in FIG3 , the center of the inner circle is below the center of the outer circle, and the two do not overlap). This creates a heating chamber with a non-circular cross-section between the inner walls of the (first and second) heating portions. The linear contact between the two axial lines is expected to more reliably clamp the cable connector copper tube. Furthermore, this solution offers the advantage of reduced heat loss due to its uniformity across the entire surface.

[0060] Obviously, ensuring clamping reliability through the above-mentioned method is only a preferred embodiment, and those skilled in the art may also adopt other methods to ensure clamping reliability, including but not limited to adjusting the inner edge of the cross section of the heating portion to a polygonal or other non-uniform structure, adding a hollow triangular prism, and the inner edge of the cross section corresponding to the hollow portion is a triangle (i.e., the inner and outer edges of the cross section of the heating portion are both triangular).

[0061] Continuing with Figures 1 and 2, in one possible embodiment, the heat exchange tube 4 is a thin-walled metal copper tube. For example, the heat exchange tube 4 is spirally wound around the outer wall of the heating portion, such as before the heating process begins. For example, a guide line (linear slide, positioning bar, etc.) can be provided on the outer wall of the heating portion to guide the installation / removal of the heat exchange tube. Alternatively, the first cylindrical structure can have a wall thickness of 2-3 mm, and the heat exchange tube has a diameter of 2-3 mm. The heat exchange tube and the heating portion can be pre-fastened and assembled into a stable assembly, and then the circumferential portion of the heat exchange tube near the bottom can be directly supported on the inner wall of the first cylindrical structure. For example, the heat exchange portion can be configured such that a circulating pump is connected to the outside of the heat exchange tube to form a cooling circuit. The circulating pump delivers a cooling medium (such as water, ethanol, styrene, etc.) into the heat exchange tube. Because the liquid cooling medium has a larger specific heat capacity, the circulating flow of the cooling medium can quickly remove heat compared to cooling at room temperature, thereby achieving rapid cooling of the heating portion.

[0062] It is understood that those skilled in the art can flexibly set the diameter, length, and pitch of the helix of the heat exchange tube according to actual needs and in combination with the size of the heating section and the heat exchange intensity. For example, the radius of the centerline circle of the cross section of the helix is ​​slightly larger than the radius of the heating section, such as 41.5 mm. Considering the size of the occupied space, the flow rate of the medium in the tube, and safety, the diameter of the heat exchange tube is set to a value between 2-3 mm (such as 2 mm), and the wall thickness is set to a value between 0.2-0.3 mm (such as 0.5 mm). The liquid inlet and outlet of the heat exchange tube are respectively connected to the water inlet and outlet of the circulating pump. In this way, the heating section can be rapidly cooled by introducing low-temperature coolant, thereby completing the complete welding process in a relatively short time. During operation, the heat exchange tube needs to be tightly wound around the outer surface (cylindrical surface) of the heating section, so the centerline of the helix of the heat exchange tube should match the diameter of the heating section. With the help of the external pressure provided by the circulating pump, the cooling medium circulates in the heat exchange tube, thereby quickly transferring heat to the outside and thereby reducing the temperature of the heating section.

[0063] Based on the above structure, in a possible embodiment, when the device for welding CORC type high-temperature superconducting cable copper-encapsulated joints is working, the cable joint copper tube is clamped by two hollow semi-cylindrical heating blocks (first heating part and second heating part), and the hollow semi-cylindrical heating block is embedded in the installation space formed by the second cylindrical structure and the support base, and the dry-burning heating rod and the temperature measuring thermocouple are respectively embedded in the corresponding heating blocks, and the terminals of the dry-burning heating rod and the temperature measuring thermocouple are externally connected to the external temperature control box.

[0064] Before heating, the heat exchange tube (a spirally shaped rigid body) is placed in the annular area between the second and first cylindrical structures, coiled around the heating section. As previously mentioned, the heat exchange tube is connected to an external circulating pump to rapidly cool the heating section. By adjusting the temperature of the temperature control box, the heating section heats the copper tube to approximately 190°C. Low-temperature solder is then added to the copper tube. Once the solder melts, the cable end is placed into the copper tube to fuse with the solder. The heating function of the temperature control box can then be turned off, and the circulating pump can be activated, allowing the cooling medium to circulate within the heat exchange tube, removing heat. During the cooling process, the operating parameters of the circulating pump can be adjusted to adjust the water flow rate accordingly according to actual needs.

[0065] Under normal circumstances, when the temperature drops to around 150°C, the solder solidifies and bonds to the cable end. After the temperature drops to room temperature, the circulation pump can be turned off, the heat exchange tube can be removed first, and then the cable (including the cable end, cable joint copper tube, and solder) and the heating unit can be removed together, or the cable can be removed first and then the heating unit. At this point, the welding work of a cable joint is completed.

[0066] As can be seen, in the apparatus for welding copper-encapsulated joints of CORC-type high-temperature superconducting cables of the present invention, the combination of the base and the heating unit ensures that the cable end is properly bonded to the solder. The combination of the heating unit and the heat exchange unit allows for rapid cooling of the heating unit after the cable end is bonded to the solder, significantly shortening the welding cycle and correspondingly avoiding the safety hazards associated with a long welding cycle.

[0067] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solutions disclosed in the present invention without the need for creative work should be included in the scope of protection of the present invention.

Claims

1. A device for welding copper-encapsulated joints of CORC type high-temperature superconducting cables, characterized in that: The device comprises: a base, a heating part and a heat exchange part; The base is formed in the installation space; The heating part is arranged in the installation space and forms a heating space capable of accommodating the copper tube of the cable joint; The heat exchange portion is removably disposed on the heating portion.

2. The device for welding copper-encapsulated joints of CORC type high-temperature superconducting cables according to claim 1, characterized in that: The heat exchange portion includes a heat exchange tube, and the heat exchange tube is sleeved on the outer wall of the heating portion.

3. The device for welding copper-encapsulated joints of CORC type high-temperature superconducting cables according to claim 2, characterized in that: The diameter of the heat exchange tube is a value between 2-3 mm; and / or The wall thickness of the heat exchange tube is a value between 0.2-0.3 mm; and / or The heat exchange tube is a rigid body made of heat-conducting material and having a spiral structure.

4. The device for welding copper-encapsulated joints of CORC type high-temperature superconducting cables according to claim 1, characterized in that: The base comprises a support base and a first cylindrical structure, The first cylindrical structure and the support base form the installation space.

5. The device for welding copper-encapsulated joints of CORC type high-temperature superconducting cables according to claim 4, characterized in that: The base includes a second cylindrical structure, which is arranged radially outside the first cylindrical structure, and In the assembled state, at least a portion of the heating portion can be freely accommodated in the first The inside of a cylindrical structure.

6. The device for welding copper-encapsulated joints of CORC type high-temperature superconducting cables according to claim 5, characterized in that: The radial dimension of the inner wall of the second cylindrical structure is 1.8-2 times the radial dimension of the heating portion along the inner wall of the second cylindrical structure; and / or The wall thickness of the second cylindrical structure is a value between 8 and 10 mm.

7. The device for welding copper-encapsulated joints of CORC type high-temperature superconducting cables according to claim 5 or 6, characterized in that: The axial dimension of the second cylindrical structure is 70-80% of the axial dimension of the heating portion along the second cylindrical structure; and / or The axial dimension of the first tubular structure is 30-40% of the axial dimension of the heating portion.

8. The device for welding copper-encapsulated joints of CORC type high-temperature superconducting cables according to claim 5 or 6, characterized in that: The heating unit includes a plurality of heating parts, The plurality of heating parts form the heating space in an assembled state.

9. The device for welding copper-encapsulated joints of CORC type high-temperature superconducting cables according to claim 8, characterized in that: The plurality of heating portions include a first heating portion and a second heating portion, and the first heating portion and the second heating portion form a heating part of a cylindrical structure in an assembled state.

10. The device for welding copper-encapsulated joints of CORC type high-temperature superconducting cables according to claim 9, characterized in that: The outer edge of the cross section of the heating portion is circular, the inner edge of the cross section of the heating portion is non-circular, and The cable connector copper tube can abut against a portion of the inner edge.

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