Superconducting cable skeleton connecting structure and connecting method
Through the design of the clamping groove and clamping head structure, the flatness and welding impurities of the middle end surface of the superconducting cable corrugated pipe are solved, and an efficient and flexible coupling method is achieved, reducing the difficulty and cost of coupling.
Patent Information
- Application Number
- CN202510668972.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-23
- Publication Date
- 2025-07-18
AI Technical Summary
In the prior art, during the corrugated pipe connection of three identical shaft superconducting cables, there are problems such as high flatness requirements for the end surface of stainless steel corrugated pipes, auxiliary devices need to be aligned during butt welding, and impurities are easily introduced in welding, resulting in high difficulty and high cost.
The clamping groove and clamping head structure is adopted, and the clamping head is fastened and connected to the clamping groove, combined with the stress groove and the pressure-reducing assembly end design, the efficient connection of the two sections of corrugated pipes is achieved, and the convergence length is flexibly adjusted within a certain range.
The efficient and quick connection of two sections of corrugated pipes is achieved, which reduces the difficulty of connection, improves the efficiency and sealing, reduces the impact of welding stress, and controls costs.
Smart Images
Figure CN120341623A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of superconducting cables, and particularly relates to a connection structure and a connection method for a superconducting cable skeleton. Background Art
[0002] In the prior art, when two sections of superconducting cables of a three-phase coaxial superconducting cable are joined through an intermediate joint, in order to achieve reliable joining and sealing of the skeleton, a welding method is generally used to join them together. However, directly butt-welding two sections of stainless steel bellows has the following technical problems: 1. The flatness requirement of the end face of the stainless steel bellows is relatively high. 2. When butt-welding two sections of stainless steel bellows, an auxiliary tension device is required to bring the end faces of the two sections of stainless steel bellows closer and align them. 3. It is easy to introduce impurities into the stainless steel bellows during the welding process and it is impossible to clean the inner wall of the stainless steel bellows. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a connection structure and a connection method for a superconducting cable skeleton, which can complete the joining of two sections of bellows efficiently and quickly, and can flexibly adjust the joining length within a certain range; the structure is concise and it is easy to control the cost.
[0004] To solve the above technical problem, the present invention provides a connection structure for a superconducting cable skeleton, including: a first connection pipe, with a first assembly end and a second assembly end respectively provided on opposite sides of the first connection pipe, and a clamping groove provided on the inner wall of the second assembly end; a first bellows connected to the first assembly end; a second connection pipe, with a third assembly end and a fourth assembly end respectively provided on opposite sides of the second connection pipe, and a clamping head on the outer wall of the fourth assembly end adapted to be connected with the clamping groove; and a second bellows connected to the third assembly end, wherein: the clamping head of the second connection pipe is inserted into the clamping groove of the first connection pipe, the clamping head is firmly connected to the clamping groove, and the first connection pipe is firmly connected to the second connection pipe; stress grooves are provided on both the first assembly end of the first connection pipe and the third assembly end of the second connection pipe.
[0005] Wherein, a first welding part is formed at the connection between the first assembly end of the first connection pipe and the first bellows, a second welding part is formed at the connection between the third assembly end of the second connection pipe and the second bellows, and a third welding part is formed at the connection between the clamping head and the clamping groove.
[0006] Wherein, a decompression assembly end extends respectively from the first assembly end of the first connection pipe and / or the third assembly end of the second connection pipe, and the end of the first bellows or the end of the second bellows is respectively adaptively connected and firmly connected within the decompression assembly end.
[0007] Wherein, a first limiting surface is provided at the bottom of the clamping groove, the end surface of the clamping head of the second connecting pipe abuts against the first limiting surface, a second limiting surface is provided on the fourth assembling end, and the end surface of the second assembling end of the first connecting pipe abuts against the second limiting surface.
[0008] Wherein, the clamping groove is a cylindrical groove.
[0009] Wherein, the clamping groove is a conical groove with a large outer diameter and a small inner diameter.
[0010] Wherein, a plurality of limiting grooves communicating with the clamping groove are provided on the inner wall of the clamping groove, the plurality of limiting grooves are circumferentially distributed on the inner wall of the clamping groove, and a plurality of limiting blocks corresponding to the limiting grooves one by one are provided on the outer wall of the clamping head.
[0011] Wherein, the inner wall of the clamping groove is composed of a plurality of arc-shaped grooves and a plurality of arc-shaped protrusions alternatingly connected, and the shape of the outer wall of the clamping head is adapted to the shape of the inner wall of the clamping groove.
[0012] To solve the above technical problems, the present invention also discloses a superconducting cable skeleton connection method, which is characterized by including the following steps: S1, smooth the end surfaces of the first corrugated pipe and the second corrugated pipe, and clean the inner walls of the first corrugated pipe and the second corrugated pipe; S2, measure the distance between the opposite end surfaces of the first corrugated pipe and the second corrugated pipe, and prepare the first connecting pipe and the second connecting pipe with matching lengths; S3, butt-weld the end surface of the first corrugated pipe with the first assembling end of the first connecting pipe, and butt-weld the end surface of the second corrugated pipe with the third assembling end of the second connecting pipe; clean the inner walls of the welded first corrugated pipe and the first connecting pipe, and clean the inner walls of the welded second corrugated pipe and the second connecting pipe; S4, sleeved the clamping head of the fourth assembling end of the second connecting pipe into the clamping groove of the second assembling end of the first connecting pipe, and butt-weld the fourth assembling end of the second connecting pipe with the second assembling end of the first connecting pipe.
[0013] Wherein, step S2 further includes the following steps: Perform cold shrinking treatment on the ends of the first corrugated pipe and the second corrugated pipe, and perform thermal expansion treatment on the reduced-pressure assembling ends of the first assembling end of the first connecting pipe and the third assembling end of the second connecting pipe; embed the ends of the first corrugated pipe and the second corrugated pipe into the reduced-pressure assembling ends of the first assembling end of the first connecting pipe and the third assembling end of the second connecting pipe one by one; perform pressing treatment on the ends of the first corrugated pipe and the reduced-pressure assembling end of the first assembling end of the first connecting pipe, and perform pressing treatment on the ends of the second corrugated pipe and the reduced-pressure assembling end of the third assembling end of the second connecting pipe.
[0014] Implementing the superconducting cable skeleton connection structure and connection method of the present invention has the following beneficial effects: The superconducting cable skeleton connection structure includes: a first connection pipe, with a first assembly end and a second assembly end respectively provided on opposite sides of the first connection pipe, and a clamping groove provided on the inner wall of the second assembly end; a first bellows connected to the first assembly end; a second connection pipe, with a third assembly end and a fourth assembly end respectively provided on opposite sides of the second connection pipe, and a clamping head on the outer wall of the fourth assembly end adapted to be connected to the clamping groove; and a second bellows connected to the third assembly end, where: the clamping head of the second connection pipe is inserted into the clamping groove of the first connection pipe, the clamping head is tightly connected to the clamping groove, and the first connection pipe is tightly connected to the second connection pipe; stress grooves are provided on both the first assembly end of the first connection pipe and the third assembly end of the second connection pipe, which can complete the connection of two sections of bellows efficiently and quickly, and can flexibly adjust the connection length within a certain range; the structure is concise and easy to control costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0016] Figure 1 It is a schematic structural diagram of the superconducting cable skeleton connection structure according to Embodiment 1 of the present invention.
[0017] Figure 2 For the superconducting cable skeleton connection structure according to Embodiment 1 of the present invention as Figure 1 shown in the enlarged structural diagram of Part A.
[0018] Figure 3 For the superconducting cable skeleton connection structure according to Embodiment 1 of the present invention as Figure 1 shown in the enlarged structural diagram of Part B.
[0019] Figure 4 It is a schematic cross-sectional structure diagram of the first connection pipe according to Embodiment 1 of the present invention.
[0020] Figure 5 It is a schematic cross-sectional structure diagram of the second connection pipe according to Embodiment 1 of the present invention.
[0021] Figure 6 It is a schematic cross-sectional structure diagram of the first connection pipe of the superconducting cable skeleton connection structure according to Embodiment 2 of the present invention.
[0022] Figure 7 It is a schematic structural diagram of the superconducting cable skeleton connection structure according to Embodiment 3 of the present invention.
[0023] Figure 8 This is the enlarged structural schematic diagram of part D as shown in Figure 1 the third embodiment of the present invention. Specific implementation mode
[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.
[0025] As Figures 1-5 shown, this is the first embodiment of the superconducting cable skeleton connection structure of the present invention.
[0026] The superconducting cable skeleton connection structure in this embodiment includes: a first connection pipe 3, with a first assembly end 302 and a second assembly end 304 respectively provided on opposite sides of the first connection pipe 3, and a clamping groove 308 provided on the inner wall of the second assembly end 304; a first bellows 1 connected to the first assembly end 302.
[0027] A second connection pipe 4, with a third assembly end 402 and a fourth assembly end 403 respectively provided on opposite sides of the second connection pipe 4, and a clamping head 406 adapted to the clamping groove 308 provided on the outer wall of the fourth assembly end 403; and a second bellows 2 connected to the third assembly end 402; wherein: the clamping head 406 of the second connection pipe 4 is inserted into the clamping groove 308 of the first connection pipe 3, the clamping head 406 is firmly connected to the clamping groove 308, and the first connection pipe 3 is firmly connected to the second connection pipe 4.
[0028] Stress grooves 31 are provided on both the first assembly end 302 of the first connection pipe 3 and the third assembly end 402 of the second connection pipe 4.
[0029] During specific implementation, the first bellows 1 and the second bellows 2 are respectively the skeletons of two segments of three-phase coaxial superconducting cables to be connected. The inner diameters of the first connection pipe 3 and the second connection pipe 4 can be the same as the inner diameters of the first bellows 1 and the second bellows 2, and the wall thicknesses of the first connection pipe 3 and the second connection pipe 4 are the same as the wall thicknesses of the first bellows 1 and the second bellows 2.
[0030] In other embodiments, according to the design requirements of the functional layers of the superconducting cable (current-carrying superconductor layer, high-voltage insulation layer, etc.), the wall thickness of the first connecting pipe 3 and the second connecting pipe 4 can be made different from the wall thickness of the first corrugated pipe 1 and the second corrugated pipe 2, so that the outer diameter of the first connecting pipe 3 and the second connecting pipe 4 is slightly larger than the outer diameter of the first corrugated pipe 1 and the second corrugated pipe 2, thereby increasing the connection strength of the skeleton connection structure; in addition, the inner diameter of the first connecting pipe 3 and the second connecting pipe 4 can be made different from the inner diameter of the first corrugated pipe 1 and the second corrugated pipe 2, such as by making a diameter-changing treatment (but the inner diameter at the welding place is the same and needs to have a smooth transition), such as adding fin structures and other structures to the inner walls of the first connecting pipe 3 and the second connecting pipe 4 to adjust the fluid flow state inside the skeleton connection structure.
[0031] In this embodiment, the first connecting pipe 3 is welded to the end of the first corrugated pipe 1, the second connecting pipe 4 is welded to the end of the second corrugated pipe 2, and then the connecting portion of the fourth assembly end 403 of the second connecting pipe 4 is sleeved into the clamping groove 308 of the second assembly end 304 of the first connecting pipe 3, and then the fourth assembly end 403 of the second connecting pipe 4 is butt-welded to the second assembly end 304 of the first connecting pipe 3. In this way, without precisely controlling the distance between the opposite end faces of the first corrugated pipe 1 and the second corrugated pipe 2, the connection of the first corrugated pipe 1 and the second corrugated pipe 2 can be completed in the natural state, and the welding slag during the welding process can be prevented from entering the interiors of the first corrugated pipe 1, the first connecting pipe 3, the second corrugated pipe 2, and the second connecting pipe 4. At the same time, the connection length between the first corrugated pipe 1 and the second corrugated pipe 2 can be flexibly adjusted within a certain range, so that the first corrugated pipe 1 and the second corrugated pipe 2 have sufficient thermal expansion and contraction displacement space.
[0032] Further, a first welding portion 301 is formed at the connection between the first assembly end 302 of the first connecting pipe 3 and the first corrugated pipe 1, a second welding portion 401 is formed at the connection between the third assembly end 402 of the second connecting pipe 4 and the second corrugated pipe 2, and a third welding portion 303 is formed at the connection between the clamping head 406 and the clamping groove 308.
[0033] The function of such a setting is as follows: By setting the welding portions, not only can the first assembly end 302 of the first connecting pipe 3 be stably connected to the end of the first corrugated pipe 1, the third assembly end 402 of the second connecting pipe 4 be stably connected to the end of the second corrugated pipe 2, and the second assembly end 304 of the first connecting pipe 3 be stably connected to the fourth assembly end 403 of the second connecting pipe 4, but also the sealing performance between the first corrugated pipe 1, the first connecting pipe 3, the second connecting pipe 4, and the second corrugated pipe 2 can be good. At the same time, by only setting three welding places, the difficulty of connecting two sections of corrugated pipes (skeletons) on site can be reduced and the connection efficiency can be improved on the basis of ensuring stability and sealing performance.
[0034] Further: Stress grooves 31 are provided at the positions of the first assembly end 302 of the first connecting pipe 3 and the third assembly end 402 of the second connecting pipe 4.
[0035] The purpose of setting the stress groove 31 is that the bottom and the top of the stress groove 31 are both provided with rounded corners. By setting the stress groove, the welding stress generated at the first welding part 301 and the second welding part 401 due to the uneven local heating and cooling during the welding process can be weakened, and then the influence of the welding stress on the mechanical properties and durability of the first welding part 301 and the second welding part 401 (skeleton connection structure) can be weakened, thereby improving the fatigue life of the skeleton connection structure.
[0036] Furthermore, a first limiting surface 305 is provided at the bottom of the clamping groove 308, and the end surface of the clamping head 406 of the second connecting tube 4 is pressed against the first limiting surface 305. A second limiting surface 404 is provided on the fourth assembly end 403, and the end surface 307 of the second assembly end 304 of the first connecting tube 3 is pressed against the second limiting surface 404.
[0037] The purpose of such a setting is: by setting the first limiting surface 305 and the second limiting surface 404, not only can the depth of the fourth assembly end 403 of the second connecting tube 4 embedded in the second assembly end 304 of the first connecting tube 3 be limited, but also a reliable sealing structure can be formed between the fourth assembly end 403 of the second connecting tube 4 and the second assembly end 304 of the first connecting tube 3, and at the same time, the welding stress generated at the third welding portion 303 can be weakened.
[0038] Preferably, the clamping groove 308 is configured as a cylindrical groove. In other embodiments, the clamping groove 308 may be configured as a conical groove that is larger outside and smaller inside.
[0039] The purpose of such arrangement is to facilitate the processing of the second assembly end 304 of the first connecting pipe 3 and the fourth assembly end 403 of the second connecting pipe 4, and to improve the connection efficiency of the two sections of the corrugated pipe (skeleton).
[0040] Preferably, the inner wall of the clamping groove 308 is provided with a plurality of limit grooves 306 connected to the clamping groove 308 , and the plurality of limit grooves 306 are evenly distributed circumferentially on the inner wall of the clamping groove 308 , and the outer wall of the clamping head 406 is provided with a plurality of limit blocks 405 corresponding one-to-one to the limit grooves 306 .
[0041] The purpose of such a setting is: by setting matching limit grooves 306 and limit blocks 405, not only can the connection between the second assembly end 304 of the first connecting tube 3 and the fourth assembly end 403 of the second connecting tube 4 be made more stable, but the welding stress generated at the third welding portion 303 can also be further weakened, thereby improving the mechanical properties of the welded connection.
[0042] like Figure 6 FIG. 2 shows a second embodiment of the superconducting cable skeleton connection structure of the present invention.
[0043] The difference between this embodiment and the above-mentioned first embodiment is that the inner wall of the clamping groove 308 is composed of a plurality of arc-shaped grooves 309 and a plurality of arc-shaped protrusions 310 that are alternately connected. The outer wall of the clamping head 406 is adapted to the inner wall of the clamping groove 308, which can improve the sealing performance between the fourth assembly end 403 of the second connecting pipe 4 and the second assembly end 304 of the first connecting pipe 3 and improve the mechanical properties of the welding joint.
[0044] As Figures 7-8 shown, it is the third embodiment of the superconducting cable skeleton connection structure of the present invention.
[0045] The difference between this embodiment and the above-mentioned first embodiment is that the first assembly end 302 of the first connecting pipe 3 and the third assembly end 402 of the second connecting pipe 4 are respectively integrally formed with a decompression assembly end 32. That is, the decompression assembly end 32 extends from the first assembly end 302 of the first connecting pipe 3 and / or the third assembly end 402 of the second connecting pipe 4 respectively. The end of the first corrugated pipe 1 or the end of the second corrugated pipe 2 is respectively adaptively connected in the decompression assembly end 32 and is fixedly connected to the decompression assembly end 32.
[0046] The decompression assembly end 32 is respectively adapted to the end of the first corrugated pipe 1 or the second corrugated pipe 2. The ends of the first corrugated pipe 1 or the second corrugated pipe 2 are respectively accommodated in the decompression assembly end 32 and are fixedly connected to the decompression assembly end 32.
[0047] By setting the decompression assembly end 32, not only can the welding stress at the welding joint be weakened (at this time, the stress groove may not be set because the decompression assembly end is an arc shape adapted to the corrugated pipe, and the arc structure can well improve the direction and magnitude of the welding stress at the welding joint), the mechanical properties of the welding joint can be improved, but also the connection strength of the welding joint can be improved, and the welding slag entering the first corrugated pipe 1, the second corrugated pipe 2, the first connecting pipe 3 and the second connecting pipe 4 can be reduced.
[0048] Furthermore, the present invention also discloses a superconducting cable skeleton connection method, which is characterized by including the following steps: S1, smooth the end faces of the first corrugated pipe 1 and the second corrugated pipe 2, and clean the inner walls of the first corrugated pipe 1 and the second corrugated pipe 2; S2, measure the distance between the opposite end faces of the first corrugated pipe 1 and the second corrugated pipe 2, and prepare the first connecting pipe 3 and the second connecting pipe 4 with matching lengths; During implementation, the function of this step is to remove impurities such as oil stains, moisture, rust, and oxide scales at the welding joint. Peel off the functional layers at the ends of the two superconducting cables so that a small section of the skeleton is exposed for each of the two superconducting cables, that is, the first corrugated pipe 1 and the second corrugated pipe 2 are exposed; smooth the end faces of the first corrugated pipe 1 and the second corrugated pipe 2 so that the end faces of the first corrugated pipe 1 and the second corrugated pipe 2 are flat and free of burrs.
[0049] S3. Butt-weld the end face of the first bellows 1 to the first assembly end 302 of the first connecting pipe 3, and butt-weld the end face of the second bellows 2 to the third assembly end 402 of the second connecting pipe 4; clean the inner walls of the welded first bellows 1 and the first connecting pipe 3, and clean the inner walls of the welded second bellows 2 and the second connecting pipe 4. S4. Insert the clamping head 406 at the fourth assembly end 403 of the second connecting pipe 4 into the clamping groove 308 at the second assembly end 304 of the first connecting pipe 3, and butt-weld the fourth assembly end 403 of the second connecting pipe 4 to the second assembly end 304 of the first connecting pipe 3.
[0050] It can be understood that: the pre-welding treatment, the welding process, the post-welding treatment, the welding process and the welding quality all need to meet the corresponding welding requirements or welding standards to achieve the purposes of stable connection, good sealing performance, welding stress and strain within the welding standards, and fatigue life meeting the design requirements, etc. The specific welding process will not be elaborated here.
[0051] Furthermore, step S2 further includes the following steps: Perform cold shrinking treatment on the ends of the first bellows 1 and the second bellows 2, and perform thermal expansion treatment on the reduced-pressure assembly ends 32 at the first assembly end 302 of the first connecting pipe 3 and the reduced-pressure assembly ends 32 at the third assembly end 402 of the second connecting pipe 4. Correspondingly embed the ends of the first bellows 1 and the second bellows 2 into the reduced-pressure assembly ends 32 at the first assembly end 302 of the first connecting pipe 3 and the reduced-pressure assembly ends 32 at the third assembly end 402 of the second connecting pipe 4 respectively. Perform pressing treatment on the end of the first bellows 1 and the reduced-pressure assembly end 32 at the first assembly end 302 of the first connecting pipe 3, and perform pressing treatment on the end of the second bellows 2 and the reduced-pressure assembly end 32 at the third assembly end 402 of the second connecting pipe 4.
[0052] By pressing the reduced-pressure assembly end 32 in this step, the gap at the connection between the reduced-pressure assembly end 32 and the bellows end can be discharged to make the two fit tightly, and further the connection of the reduced-pressure assembly end 32 can be made more stable and have good sealing performance.
[0053] The superconducting cable skeleton connection structure and connection method in this embodiment. The superconducting cable skeleton connection structure includes: a first connection pipe, with a first assembly end and a second assembly end respectively provided on opposite sides of the first connection pipe, and a clamping groove provided on the inner wall of the second assembly end; a first bellows connected to the first assembly end; a second connection pipe, with a third assembly end and a fourth assembly end respectively provided on opposite sides of the second connection pipe, and a clamping head on the outer wall of the fourth assembly end adapted to be connected to the clamping groove; and a second bellows connected to the third assembly end, wherein: the clamping head of the second connection pipe is inserted into the clamping groove of the first connection pipe, the clamping head is tightly connected to the clamping groove, and the first connection pipe is tightly connected to the second connection pipe; stress grooves are provided on both the first assembly end of the first connection pipe and the third assembly end of the second connection pipe, which can efficiently and quickly complete the connection of two sections of bellows and can flexibly adjust the connection length within a certain range; the structure is simple and the cost is easy to control.
Claims
1. A superconducting cable skeleton connection structure, characterized in that, Comprising: A first connecting pipe, with a first assembly end and a second assembly end respectively provided on opposite sides of the first connecting pipe, and a clamping groove provided on the inner wall of the second assembly end; A first bellows connected to the first assembly end; A second connecting pipe, with a third assembly end and a fourth assembly end respectively provided on opposite sides of the second connecting pipe, and a clamping head on the outer wall of the fourth assembly end adapted to be connected to the clamping groove; And A second bellows connected to the third assembly end, wherein: The clamping head of the second connecting pipe is inserted into the clamping groove of the first connecting pipe, the clamping head is tightly connected to the clamping groove, and the first connecting pipe is tightly connected to the second connecting pipe; Stress grooves are provided on both the first assembly end of the first connecting pipe and the third assembly end of the second connecting pipe.
2. The superconducting cable skeleton connection structure according to claim 1, wherein A first welding part is formed at the connection between the first assembly end of the first connecting pipe and the first bellows, a second welding part is formed at the connection between the third assembly end of the second connecting pipe and the second bellows, and a third welding part is formed at the connection between the clamping head and the clamping groove.
3. The superconducting cable skeleton connection structure according to claim 1, characterized in that, A pressure-reducing assembly end extends respectively from the first assembly end of the first connecting pipe and / or the third assembly end of the second connecting pipe, and the end of the first bellows or the end of the second bellows is respectively adaptively connected and tightly connected within the pressure-reducing assembly end.
4. The superconducting cable skeleton connection structure according to claim 1, characterized in that A first limiting surface is provided at the bottom of the clamping groove, the end face of the clamping head of the second connecting pipe abuts against the first limiting surface, a second limiting surface is provided on the fourth assembly end, and the end face of the second assembly end of the first connecting pipe abuts against the second limiting surface.
5. The superconducting cable skeleton connection structure according to claim 1, wherein, The clamping groove is a cylindrical groove.
6. The superconducting cable skeleton connection structure according to claim 1, characterized in that The clamping groove is a conical groove with a larger outer part and a smaller inner part.
7. The superconducting cable skeleton connection structure according to claim 6, characterized in that, A plurality of limiting grooves communicating with the clamping groove are provided on the inner wall of the clamping groove, the plurality of limiting grooves are circumferentially distributed on the inner wall of the clamping groove, and a plurality of limiting blocks corresponding to the limiting grooves one by one are provided on the outer wall of the clamping head.
8. The superconducting cable skeleton connection structure according to claim 1, characterized in that, The inner wall of the clamping groove is composed of a plurality of arc-shaped grooves and a plurality of arc-shaped protrusions alternatingly connected, and the outer wall shape of the clamping head is adapted to the inner wall shape of the clamping groove.
9. A superconducting cable skeleton connection method, characterized in that, Including the following steps: S1, smoothing the end faces of the first bellows and the second bellows, and cleaning the inner walls of the first bellows and the second bellows; S2, measuring the distance between the opposite end faces of the first bellows and the second bellows, and preparing the first connecting pipe and the second connecting pipe with matching lengths; S3, butt-welding the end face of the first bellows with the first assembly end of the first connecting pipe, and butt-welding the end face of the second bellows with the third assembly end of the second connecting pipe; cleaning the inner walls of the welded first bellows and the first connecting pipe, and cleaning the inner walls of the welded second bellows and the second connecting pipe; S4, sleeving the clamping head at the fourth assembly end of the second connecting pipe into the clamping groove at the second assembly end of the first connecting pipe, and butt-welding the fourth assembly end of the second connecting pipe with the second assembly end of the first connecting pipe.
10. The superconducting cable skeleton connection method according to claim 9, wherein, The step S2 further includes the following steps: Perform cold shrinking treatment on the ends of the first bellows and the second bellows, and perform thermal expansion treatment on the reduced-pressure fitting ends of the first fitting end of the first connecting pipe and the reduced-pressure fitting ends of the third fitting end of the second connecting pipe; Embed the ends of the first bellows and the ends of the second bellows into the reduced-pressure fitting ends of the first fitting end of the first connecting pipe and the reduced-pressure fitting ends of the third fitting end of the second connecting pipe in a one-to-one correspondence; Perform crimping treatment on the ends of the first bellows and the reduced-pressure fitting ends of the first fitting end of the first connecting pipe, and perform crimping treatment on the ends of the second bellows and the reduced-pressure fitting ends of the third fitting end of the second connecting pipe.