Superconducting cable and skeleton joint structure thereof

Abstract

The invention discloses a framework joint structure of a superconducting cable, which comprises two superconducting cable core end heads, and is characterized in that each superconducting cable core end head comprises a framework corrugated pipe, a smooth layer and a functional layer; the framework corrugated pipe middle connecting piece comprises a belt hoop, a long thread end side and a short thread end side; the long thread end sides and the short thread end sides are screwed into the framework corrugated pipes at the ends of the two superconducting cable cores in a one-to-one correspondence manner; and the smooth shell is arranged outside the connecting piece in the middle of the framework corrugated pipe, which is respectively connected with the ends of the two superconducting cable cores. The invention also discloses a superconducting cable. By implementing the superconducting cable and the skeleton joint structure thereof, the connection of the ends of the two superconducting cable cores can be quickly completed; the structure is simple and reasonable, joint surfaces are neat, and cost is easy to control.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting cables, and particularly relates to a superconducting cable and a skeleton joint structure thereof. Background Art

[0002] In the prior art, the connection of the intermediate joint involves the connection of many functional layers such as a skeleton corrugated pipe, insulation, superconducting tape, and shielding layer. Among them, the connection of the skeleton corrugated pipe is the first link in the connection of the superconducting cable core and is the basis for the connection of other functional layers.

[0003] The traditional superconducting cable skeleton joint mainly has the following technical problems: 1. It is impossible to form a continuous fluid channel; 2. The mechanical strength is insufficient; 3. The structure is complex and not conducive to on-site installation and connection; 4. After connection, a flat surface cannot be formed, resulting in deformation of the shape of the subsequent functional layer, thereby affecting the insulation strength.

[0004] In addition, the traditional superconducting cable skeleton joint also has problems such as unreasonable structure design and high product cost. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a superconducting cable and a skeleton joint structure thereof, which can quickly complete the connection of the ends of two superconducting cable cores, and the joint surface is neat; the structure is concise and reasonable, and the cost is easy to control.

[0006] To solve the above technical problems, the present invention provides a skeleton joint structure of a superconducting cable, including: two superconducting cable core ends, and the superconducting cable core ends include: a skeleton corrugated pipe, a smooth layer installed at one end of the skeleton corrugated pipe, and a functional layer installed at one end of the smooth layer; a skeleton corrugated pipe intermediate connector, and the skeleton corrugated pipe intermediate connector includes: a belt hoop, a long threaded end side extending from one end of the belt hoop, and a short threaded end side extending from the other end of the belt hoop; and a smooth shell, wherein: the outer diameter sizes of the long threaded end side and the short threaded end side are respectively adapted to the inner diameter size of the skeleton corrugated pipe of the two superconducting cable core ends, and the long threaded end side and the short threaded end side are respectively screwed into the inside of the skeleton corrugated pipes of the two superconducting cable core ends; the smooth shell is installed outside the skeleton corrugated pipe intermediate connector connected to the two superconducting cable core ends respectively.

[0007] Among them, the smooth layer is a copper strip with the same width and thickness as the superconducting tape, and the copper strip is closely wound on the skeleton corrugated pipe at a certain angle; the skeleton corrugated pipe is a stainless steel spiral corrugated structure.

[0008] Among them, the length ratio of the long threaded end side to the short threaded end side is 1:2; the winding directions, thread height sizes, and thread pitch parameters of the long threaded end side and the short threaded end side are the same.

[0009] Among them, the outer diameter dimension of the belt hoop is consistent with the outer diameter dimension of the skeleton corrugated pipe.

[0010] Among them, the length dimensions of the long threaded end side and the short threaded end side screwed into the inside of the skeleton corrugated pipes at the ends of the two superconducting cable cores one by one are set to be adjustable to adapt to the distance between the ends of the two superconducting cable cores; the screwing amount of the skeleton corrugated pipe intermediate connector screwed into the skeleton corrugated pipe is more than 2 full turns.

[0011] Among them, the end face of the skeleton corrugated pipe is closely welded to the external thread of the long threaded end side or the external thread of the short threaded end side.

[0012] Among them, the smooth shell includes two smooth shell bodies that can be butted into a hollow cylindrical shell, where: the wall thickness dimension of the smooth shell body is consistent with the thickness dimension of the smooth layer.

[0013] Among them, a semi-keyway and a central full-keyway are respectively formed on the smooth shell body, and the positions where the semi-keyway and the central full-keyway are arranged respectively correspond to and match the position of the belt hoop after connection.

[0014] Among them, the length dimensions of the semi-keyway and the central full-keyway are respectively larger than the height dimension of the belt hoop in the range of 5-10 mm.

[0015] To solve the above technical problems, the present invention also discloses a superconducting cable having the above-mentioned skeleton joint structure.

[0016] Implementing the superconducting cable and its skeleton joint structure of the present invention has the following beneficial effects: The skeleton joint structure of the superconducting cable includes: two superconducting cable core ends, and the superconducting cable core ends include: a skeleton corrugated pipe, a smooth layer installed at one end of the skeleton corrugated pipe, and a functional layer installed at one end of the smooth layer; a skeleton corrugated pipe intermediate connector, and the skeleton corrugated pipe intermediate connector includes: a belt hoop, a long threaded end side extending from one end of the belt hoop, and a short threaded end side extending from the opposite side end of the belt hoop; and a smooth shell, where: the outer diameter dimensions of the long threaded end side and the short threaded end side respectively match the inner diameter dimension of the skeleton corrugated pipe, and the long threaded end side and the short threaded end side are screwed into the inside of the skeleton corrugated pipes of the two superconducting cable core ends one by one; the smooth shell is installed outside the skeleton corrugated pipe intermediate connector connected to the two superconducting cable core ends respectively, and can quickly complete the connection of the two superconducting cable core ends, and the joint surface is neat; the structure is simple and reasonable, and it is easy to control the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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 the description of the embodiments or the prior art. Obviously, the drawings in the following description 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.

[0018] Figure 1 It is a schematic structural diagram of the end of the superconducting cable core in the embodiment of the present invention.

[0019] Figure 2 It is a schematic structural diagram of the intermediate connector of the skeleton corrugated pipe in the embodiment of the present invention.

[0020] Figure 3 It is a schematic structural diagram of the screwing assembly of the ends of two superconducting cable cores and the intermediate connector of the skeleton corrugated pipe in the embodiment of the present invention.

[0021] Figure 4 It is a schematic structural diagram of the assembly of the ends of two superconducting cable cores and the intermediate connector of the skeleton corrugated pipe after assembly in the embodiment of the present invention.

[0022] Figure 5 It is a top view structural diagram of the smooth shell body in the embodiment of the present invention.

[0023] Figure 6 It is a side view structural diagram of the smooth shell body in the embodiment of the present invention.

[0024] Figure 7 It is a schematic overall assembly structure diagram of the superconducting cable skeleton joint in the embodiment of the present invention. Specific embodiments

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] As Figures 1 - 7 shown, it is the first embodiment of the skeleton joint structure of the superconducting cable of the present invention.

[0027] The skeleton joint structure of the superconducting cable in this embodiment includes: two superconducting cable core ends 1, and the superconducting cable core end 1 includes: a skeleton bellows 11, a smooth layer 12 installed at one end of the skeleton bellows 11, and a functional layer 13 installed at one end of the smooth layer 12; a skeleton bellows intermediate connector 2, and the skeleton bellows intermediate connector 2 includes: a belt hoop 21, a long threaded end side 22 extending from one end of the belt hoop 21, and a short threaded end side 23 extending from the opposite end of the belt hoop 21; and a smooth shell 3.

[0028] Wherein: the outer diameter dimensions of the long threaded end side 22 and the short threaded end side 23 are respectively adapted to the inner diameter dimension of the skeleton bellows 11, and the long threaded end side 22 and the short threaded end side 23 are respectively screwed into the inside of the skeleton bellows 11 of the two superconducting cable core ends 1; the smooth shell 3 is installed on the outside where the skeleton bellows intermediate connector 2 is respectively connected to the two superconducting cable core ends 1.

[0029] During specific implementation, the structures of the two superconducting cable core ends 1 are roughly symmetrical, and both include a skeleton bellows 11, a smooth layer 12, and a functional layer 13. It can be understood that the cable structures applicable to the skeleton joint structure of the superconducting cable in this embodiment include: various configurations such as three-phase coaxial configuration, single-core configuration, DC monopole or bipolar configuration, etc. Different configurations can adopt different structures of the skeleton bellows 11.

[0030] Furthermore, the smooth layer 12 is preferably made of a copper strip with the same width and thickness as the superconducting tape, and the copper strip is closely wound around the skeleton bellows 11 at a certain angle. The skeleton bellows 13 is preferably made of 304 or 304L stainless steel with good mechanical properties at low temperatures, and its configuration is preferably a spiral corrugation.

[0031] Furthermore, the skeleton bellows intermediate connector 2 includes: a belt hoop 21, a long threaded end side 22, and a short threaded end side 23. During implementation, the outer diameter dimension of the belt hoop 21 is the same as the outer diameter dimension of the skeleton bellows 11. The height of the belt hoop is not less than 20 mm; the length dimension ratio of the long threaded end side 22 and the short threaded end side 23 is 1:2, and the winding directions, thread height dimensions, and thread pitch parameters of the long threaded end side 22 and the short threaded end side 23 are the same.

[0032] The material of the skeleton bellows intermediate connector 2 is preferably 304 or 304L, and the wall thickness at the thinnest part of the structure is not less than 1.5 mm and is controlled within 2 mm.

[0033] During implementation, since the outer diameter dimensions of the long threaded end side 22 and the short threaded end side 23 are respectively adapted to the inner diameter dimension of the skeleton bellows 11, the skeleton bellows intermediate connector 2 can be screwed into the skeleton bellows 11 of the superconducting cable core end 1.

[0034] Preferably, the length dimensions of the long threaded end side 22 and the short threaded end side 23 screwed into the inside of the skeleton corrugated pipe 11 at both ends of the two superconducting cable cores 1 are set to be adjustable to adapt to the distance between the two superconducting cable core ends; the screwing-in amount of the skeleton corrugated pipe intermediate connector into the skeleton corrugated pipe is more than 2 full turns.

[0035] During implementation, the long threaded end side 22 is first screwed into the skeleton corrugated pipe 11 on one side until it reaches the bottom, and then the positions of the two superconducting cable core ends 1 are adjusted so that the skeleton corrugated pipe intermediate connector 2 can be screwed into the skeleton corrugated pipe 11 on the opposite side in the opposite direction. By controlling the screwing-in depth, this connection method has good on-site length adaptability and can well match the distance between the two superconducting cable core ends.

[0036] Preferably, the end face of the skeleton corrugated pipe 11 is closely welded to the external thread of the long threaded end side 22 or the external thread of the short threaded end side 23. The function of such a setting is that since the skeleton corrugated pipe 11 has pressure during operation, after welding and fixing, comprehensive flaw detection is also required, and leak detection with a sealing mass spectrometer is needed.

[0037] Furthermore, the smooth shell 3 includes two smooth shell bodies 31 that can be butted into a hollow cylindrical shell, where: the wall thickness dimension of the smooth shell body 31 is kept consistent with the thickness dimension of the smooth layer 12.

[0038] Preferably, semi-keyways 32 and a central full keyway 33 are respectively provided on the smooth shell body 31, and the positions where the semi-keyways 32 and the central full keyway 33 are provided are respectively corresponding and adapted to the positions of the belt hoops 21 after connection.

[0039] During implementation, the smooth shell 3 is a 304 stainless steel thin-walled pipe symmetrically cut in half, and the edges are smoothed. The wall thickness is the same as or slightly smaller than the thickness of the smooth layer copper strip. The length dimensions of the semi-keyways 32 and the central full keyway 33 are respectively greater than the height dimension of the belt hoop by a range of 5 - 10 mm. Further, the length of the smooth shell 3 matches the distance between the two smooth layer copper strips between the two superconducting cable core ends 1 after assembly.

[0040] When the skeleton joint structure of the superconducting cable in this embodiment is specifically implemented, after the skeleton corrugated pipe intermediate connector 2 is connected to and adjusted with the skeleton corrugated pipes 11 of the two superconducting cable core ends 1, one smooth shell body 31 is buckled on the connected skeleton corrugated pipe 11, and through adjustment, its two ends are made flush with the ends of the smooth layer 12. Then, the smooth shell body 31 is welded to the belt hoop 21 of the skeleton corrugated pipe intermediate connector 2 at the straight edge of the central full keyway 33.

[0041] Next, another smooth shell body 31 is buckled on the welded skeleton corrugated pipe 11, and symmetrically forms a cylindrical shell with the already welded smooth shell body 31, and welding is carried out at the full keyway 33 at its center.

[0042] Finally, the smooth shell 3 is welded to the belt hoop 21 at the positions of the half keyways 32 on the side edges of the two smooth shell bodies 31 respectively. At this time, the smooth shell 3 and the smooth layer 12 form a continuous approximately circular symmetric flat structure.

[0043] The present invention also discloses a superconducting cable having the above superconducting cable skeleton joint structure. The specific implementation manner of the superconducting cable is the same as that of the above superconducting cable skeleton joint structure, and will not be described in detail here.

[0044] In the superconducting cable and its skeleton joint structure in this embodiment, the superconducting cable skeleton joint structure includes: two superconducting cable core ends, and the superconducting cable core ends include: a skeleton corrugated pipe, a smooth layer installed at one end of the skeleton corrugated pipe, and a functional layer installed at one end of the smooth layer; a skeleton corrugated pipe intermediate connector, and the skeleton corrugated pipe intermediate connector includes: a belt hoop, a long threaded end side extending from one end of the belt hoop, and a short threaded end side extending from the other end of the belt hoop opposite to the long threaded end side; and a smooth shell, wherein: the outer diameter sizes of the long threaded end side and the short threaded end side are respectively adapted to the inner diameter size of the skeleton corrugated pipe, and the long threaded end side and the short threaded end side are respectively screwed into the inside of the skeleton corrugated pipes of the two superconducting cable core ends; the smooth shell is installed outside the skeleton corrugated pipe intermediate connector connected to the two superconducting cable core ends respectively, can quickly complete the connection of the two superconducting cable core ends, and the joint surface is neat; the structure is concise and reasonable, and it is easy to control the cost.

Claims

1. A skeleton joint structure of a superconducting cable, characterized in that, Comprising: Two superconducting cable core ends, the superconducting cable core ends comprising: a skeleton bellows, a smooth layer provided at one end of the skeleton bellows, and a functional layer provided at one end of the smooth layer; A skeleton bellows intermediate connector, the skeleton bellows intermediate connector comprising: a belt hoop, a long threaded end side extending from one end of the belt hoop, and a short threaded end side extending from the opposite end of the belt hoop; and A smooth shell, wherein: The outer diameter dimensions of the long threaded end side and the short threaded end side are respectively adapted to the inner diameter dimensions of the skeleton bellows, and the long threaded end side and the short threaded end side are screwed into the inside of the skeleton bellows of the two superconducting cable core ends in a one-to-one correspondence; The smooth shell is provided on the outside where the skeleton bellows intermediate connector is respectively connected to the two superconducting cable core ends.

2. The skeleton joint structure of the superconducting cable according to claim 1, characterized in that The smooth layer is a copper strip having the same width and thickness as the superconducting tape, and the copper strip is closely wound around the skeleton bellows at a certain angle; The skeleton bellows is of a stainless steel spiral corrugated structure.

3. The skeleton joint structure of the superconducting cable according to claim 1, characterized in that, The length dimension ratio of the long threaded end side and the short threaded end side is 1:2; The winding directions, thread height dimensions and thread pitch parameters of the long threaded end side and the short threaded end side are the same.

4. The skeleton joint structure of the superconducting cable according to claim 1, characterized in that, The outer diameter dimension of the belt hoop is the same as the outer diameter dimension of the skeleton bellows.

5. The skeleton joint structure of the superconducting cable according to claim 1, characterized in that, The length dimension of the long threaded end side and the short threaded end side screwed into the inside of the skeleton bellows of the two superconducting cable core ends in a one-to-one correspondence is set to be adjustable to adapt to the distance between the two superconducting cable core ends; The screwing amount of the skeleton bellows intermediate connector into the skeleton bellows is more than 2 full turns.

6. The skeleton joint structure of the superconducting cable according to claim 5, characterized in that, The end face of the skeleton bellows is closely welded to the external thread of the long threaded end side or the external thread of the short threaded end side.

7. The skeleton joint structure of the superconducting cable according to claim 1, characterized in that, The smooth shell comprises two smooth shell bodies that can be butted into a hollow cylindrical shell, wherein: the wall thickness dimension of the smooth shell body is the same as the thickness dimension of the smooth layer.

8. The skeleton joint structure of the superconducting cable according to claim 1, characterized in that, Half key grooves and a central full key groove are respectively provided on the smooth shell body, and the positions where the half key grooves and the central full key groove are provided are respectively corresponding and adapted to the position of the belt hoop after connection.

9. The skeleton joint structure of the superconducting cable according to claim 8, characterized in that, The length dimensions of the half key groove and the central full key groove are respectively greater than the height dimension of the belt hoop by a range of 5-10 mm.

10. A superconducting cable, characterized in that, The superconducting cable comprises the skeleton joint structure of the superconducting cable according to any one of claims 1-9.

Images