Low-loss high-temperature superconducting cable and production process

Abstract

The present invention discloses a low-loss high-temperature superconducting cable and a production process, comprising a central support frame, an outer support frame provided outside the central support frame, an outer insulating layer, a thermal insulation layer, and an outer protective sleeve provided on the outer side of the outermost outer support frame in sequence, and an anti-corrosion protective layer provided on the outer side of the outer protective sleeve; the central support frame comprises a central tube of a hollow cylindrical structure, an axial splice provided on the outer surface of the central tube, and an axial superconducting tape located on the surface of the central tube between adjacent axial splice strips; the outer support frame comprises an outer tube of a hollow cylindrical structure, an inner rotating sleeve and an outer rotating sleeve provided on the inner and outer sides of the outer tube, an inner axial splice provided on the inner surface of the inner rotating sleeve, and an inner superconducting tape provided between adjacent inner axial splice strips; and an outer axial splice provided on the outer surface of the outer rotating sleeve, and an outer superconducting tape provided between adjacent outer axial splice strips. The present invention has the characteristic of being able to effectively reduce losses.

Description

Technical Field

[0001] The present invention relates to a cable, in particular to a low-loss high-temperature superconducting cable and a production process. Background Art

[0002] Superconducting cables are currently the most promising superconducting power equipment in the field of superconducting power technology. Their zero-resistance characteristics give them a significant advantage over traditional cables when transmitting electricity, enabling low-voltage, high-current, and high-energy-density transmission. At the same voltage level, superconducting cables have significantly higher power transmission capabilities and a smaller footprint than conventional cables. Currently, the ribbons in existing high-temperature superconducting cables are generally stacked inside and out, but placing the ribbons too close together can result in significant AC losses. Furthermore, the number of stacked layers is relatively small. Therefore, existing technologies suffer from high losses. Summary of the Invention

[0003] The purpose of the present invention is to provide a low-loss high-temperature superconducting cable and a production process. The present invention has the characteristic of being able to effectively reduce loss.

[0004] The technical solution of the present invention is as follows: a low-loss high-temperature superconducting cable includes a central support frame, one or more concentrically distributed outer support frames are arranged outside the central support frame, an outer insulating layer, a thermal insulation layer and an outer protective sheath are arranged on the outer side of the outermost outer support frame in sequence, and an anti-corrosion protective layer is also provided on the outer side of the outer protective sheath;

[0005] The central support frame includes a central tube with a hollow cylindrical structure, the outer surface of which is provided with a group of axial plug-in strips with annular distribution and a T-shaped cross-section, and axial superconducting tapes located on the surface of the central tube are provided between adjacent axial plug-in strips;

[0006] The outer support skeleton includes an outer tube with a hollow cylindrical structure, and an inner rotating sleeve and an outer rotating sleeve are respectively provided on the inner and outer sides of the outer tube. The inner surface of the inner rotating sleeve is provided with an inner axial plug-in strip that matches the axial plug-in strip, and an inner superconducting tape is provided between adjacent inner axial plug-in strips. The outer surface of the outer rotating sleeve is provided with a matching outer axial plug-in strip, and an outer superconducting tape is provided between adjacent outer axial plug-in strips.

[0007] In the aforementioned low-loss high-temperature superconducting cable, the end faces of the axial connector, the inner axial connector and the outer axial connector are all provided with telescopic rods and pre-compression plates, and springs are sleeved on the telescopic rods.

[0008] In the aforementioned low-loss high-temperature superconducting cable, a shielding layer is provided on the surface of the pre-pressing plate.

[0009] In the aforementioned low-loss high-temperature superconducting cable, the outer insulating layer includes an annular insulating plate, the inner side of which is provided with an insulating support plug that matches the outer axial plug strip, and the end of the insulating support plug is provided with a second spring and a pressing plate.

[0010] In the aforementioned low-loss high-temperature superconducting cable, the connecting surfaces of the inner rotating sleeve and the outer rotating sleeve are provided with multiple rows of sliding groups axially arranged in parallel; each row of sliding groups includes multiple annularly distributed sliders, each slider having a groove provided thereon, and a positioning spring and a ball bearing provided in the groove;

[0011] The inner and outer walls of the outer cylinder are both provided with multiple rows of annular grooves, and the inner bottom surfaces of the annular grooves are provided with positioning grooves that match the balls; the inner and outer walls of the outer cylinder are also provided with axial passages connected to each annular groove.

[0012] The production process of low-loss high-temperature superconducting cables includes the following steps:

[0013] S1. Arrange the axial superconducting tape between adjacent axial connecting strips on the outer surface of the central support frame;

[0014] S2. placing the inner superconducting tape between the inner axial splicing strips of the outer support frame, and placing the outer superconducting tape between the outer axial splicing strips of the outer support frame;

[0015] S3, then inserting the inner axial plug-in strips of the outer support frame between the axial plug-in strips of the central support frame to achieve compression and fixation of the axial superconducting tape and the inner superconducting tape;

[0016] S4. Then, insert the corresponding outer support frames in sequence, insert the outer insulation layer into the outermost outer support frame, and press it with the pressing plate;

[0017] S5. Then, a thermal insulation layer and an outer protective cover are sequentially provided, and an anti-corrosion protective layer is applied on the surface of the outer protective cover.

[0018] Compared with the prior art, the present invention consists of a central support skeleton, one or more concentrically distributed outer support skeletons, an outer insulating layer, a thermal insulation layer, an outer protective sleeve and an anti-corrosion protective layer arranged outside the outer support skeleton. The central support skeleton and the outer support skeleton are connected by plug-in connection, which is convenient for installation; an axial superconducting tape is arranged outside the central support skeleton, and an inner superconducting tape and an outer superconducting tape are arranged on the inner and outer sides of the outer support skeleton, so that the axial superconducting tape, the inner superconducting tape and the outer superconducting tape can be staggered and stacked, effectively reducing AC loss; and the number of stacked layers of tapes can also be increased to improve power transmission capacity. At the same time, the outer support skeleton of the present application is provided with a rotatable inner rotating sleeve and an outer rotating sleeve structure on the inner and outer sides, so that the staggered position between the inner and outer superconducting tapes can be flexibly adjusted to further reduce AC loss. In summary, the present invention has the characteristics of being able to effectively reduce losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 yes Figure 1 A partial enlarged view of

[0021] Figure 3 is a cross-sectional view of the outer support frame;

[0022] Figure 4 It is a partial enlarged view of the outer rotating sleeve.

[0023] The marks in the accompanying drawings are: 1-central support skeleton, 2-outer support skeleton, 3-outer insulation layer, 4-thermal insulation layer, 5-outer protective sleeve, 6-anti-corrosion protective layer, 11-center tube, 12-axial plug-in strip, 13-axial superconducting tape, 21-outer tube, 22-inner rotating sleeve, 23-outer rotating sleeve, 24-inner axial plug-in strip, 25-inner superconducting tape, 26-outer axial plug-in strip, 27-outer superconducting tape, 7-telescopic rod, 8-pre-compression plate, 9-spring, 31-annular insulating plate, 32-insulating support plug, 33-second spring, 34-pressure plate, 14-slider, 15-groove, 16-positioning spring, 17-ball, 211-annular slide groove, 212-positioning groove, 213-axial passage. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0025] Example: A low-loss high-temperature superconducting cable, comprising: Figure 1-4 As shown, it includes a central support frame 1, and one or more concentrically distributed outer support frames 2 are arranged outside the central support frame 1. The outer side of the outermost outer support frame 2 is sequentially provided with an outer insulating layer 3, a thermal insulation layer 4 and an outer protective cover 5, and an anti-corrosion protective layer 6 is also provided outside the outer protective cover 5;

[0026] The central support frame 1 comprises a central tube 11 of a hollow cylindrical structure, the outer surface of which is provided with a group of annularly distributed axial plug-in bars 12 with a T-shaped cross section, and an axial superconducting tape 13 located on the surface of the central tube 11 between adjacent axial plug-in bars 12;

[0027] The outer support skeleton 2 includes an outer tube 21 with a hollow cylindrical structure, and an inner rotating sleeve 22 and an outer rotating sleeve 23 are respectively provided on the inner and outer sides of the outer tube 21. The inner surface of the inner rotating sleeve 22 is provided with an inner axial plug-in strip 24 that matches the axial plug-in strip 12, and an inner superconducting tape 25 is provided between adjacent inner axial plug-in strips 24. The outer surface of the outer rotating sleeve 23 is provided with a matching outer axial plug-in strip 26, and an outer superconducting tape 27 is provided between adjacent outer axial plug-in strips 26.

[0028] The end surfaces of the axial plug-in strip 12 , the inner axial plug-in strip 24 and the outer axial plug-in strip 26 are all provided with a telescopic rod 7 and a pre-compression plate 8 , and a spring 9 is sleeved on the telescopic rod 7 .

[0029] A shielding layer is provided on the surface of the pre-pressing plate 8 .

[0030] The outer insulating layer 3 includes an annular insulating plate 31 , an insulating support plug 32 that matches the outer axial plug strip 3 is provided inside the annular insulating plate 31 , and a second spring 33 and a pressing plate 34 are provided at the end of the insulating support plug 32 .

[0031] The connecting surfaces of the inner rotating sleeve 22 and the outer rotating sleeve 23 are provided with multiple rows of sliding groups distributed axially in parallel; each row of sliding groups includes multiple annularly distributed sliders 14, each of which is provided with a groove 15, and a positioning spring 16 and a ball 17 are provided in the groove 15; the inner and outer wall surfaces of the outer cylinder 21 are provided with multiple rows of annular grooves 211, and the inner bottom surface of the annular groove 211 is provided with a positioning groove 212 that cooperates with the ball 17; the inner and outer wall surfaces of the outer cylinder 21 are also provided with an axial passage 213 connected to each annular groove 211.

[0032] The production process of low-loss high-temperature superconducting cables includes the following steps:

[0033] S1. Arrange the axial superconducting tape between adjacent axial connecting strips on the outer surface of the central support frame;

[0034] S2. placing the inner superconducting tape between the inner axial splicing strips of the outer support frame, and placing the outer superconducting tape between the outer axial splicing strips of the outer support frame;

[0035] S3, then inserting the inner axial plug-in strips of the outer support frame between the axial plug-in strips of the central support frame to achieve compression and fixation of the axial superconducting tape and the inner superconducting tape;

[0036] S4. Then, insert the corresponding outer support frames in sequence, insert the outer insulation layer into the outermost outer support frame, and press it with the pressing plate;

[0037] S5. Then, a thermal insulation layer and an outer protective cover are sequentially provided, and an anti-corrosion protective layer is applied on the surface of the outer protective cover.

[0038] The end faces of the axial connector, inner axial connector and outer axial connector are all provided with telescopic rods, springs and pre-load plates. The surface of the pre-load plate is also provided with a shielding layer, which can not only ensure the adaptive compression of the corresponding superconducting tapes, but also reduce AC losses.

[0039] The superconducting tape can use the second generation high temperature REBCO superconducting tape,

[0040] The axial hollow portion of the outer tube is provided with a liquid nitrogen channel. The outer tube is also provided with an axial cooling and heat dissipation channel. This allows for multiple heat dissipation and improves the cooling effect.

[0041] The installation process of the inner rotating sleeve and the outer rotating sleeve: insert the sliders on the outer wall of the inner rotating sleeve and the inner wall of the outer rotating sleeve into the axial passage. After reaching the specified position, rotate the inner rotating sleeve and the outer rotating sleeve so that the sliders correspond to the annular grooves at the corresponding positions, and the ball enters the positioning groove under the action of the spring force to achieve positioning and limiting. During subsequent rotation, the slider moves along the annular groove.

[0042] The production process of the present invention is as follows: the axial superconducting tape is arranged on the bottom surface between the adjacent axial plug-in strips on the outer surface of the central support skeleton, the inner superconducting tape is arranged on the inner bottom surface between the inner axial plug-in strips of the outer support skeleton, the outer superconducting tape is arranged on the outer bottom surface between the outer axial plug-in strips of the outer support skeleton, and then the inner axial plug-in strips of the outer support skeleton are inserted between the axial plug-in strips of the central support skeleton to realize the compression and fixation of the axial superconducting tape and the inner superconducting tape, and then the corresponding outer support skeletons are inserted in turn, the outer insulating layer is inserted into the outermost outer support skeleton, and compressed by the compression plate, and then the thermal insulation layer and the outer protective cover are arranged in turn, and the anti-corrosion protective layer is coated on the surface of the outer protective cover to complete the production of the high-temperature superconducting cable.

[0043] When the position of the outer superconducting tape needs to be adjusted, it is only necessary to rotate the outer rotating sleeve.

Claims

1. Low-loss high-temperature superconducting cable, characterized by: The invention comprises a central support frame (1), one or more concentrically distributed outer support frames (2) are provided outside the central support frame (1), an outer insulating layer (3), a heat-insulating layer (4) and an outer protective cover (5) are provided on the outer side of the outermost outer support frame (2), and an anti-corrosion protective layer (6) is further provided on the outer side of the outer protective cover (5); The central support skeleton (1) comprises a central tube (11) of a hollow cylindrical structure, wherein a group of axial plug-in strips (12) distributed in an annular manner and having a T-shaped cross section are provided on the outer surface of the central tube (11), and axial superconducting strips (13) located on the surface of the central tube (11) are provided between adjacent axial plug-in strips (12); The outer support frame (2) comprises an outer cylinder (21) of a hollow cylindrical structure, an inner rotating sleeve (22) and an outer rotating sleeve (23) are respectively provided on the inner and outer sides of the outer cylinder (21), an inner axial plug-in strip (24) matching with the axial plug-in strip (12) is provided on the inner surface of the inner rotating sleeve (22), and an inner superconducting tape (25) is provided between adjacent inner axial plug-in strips (24), and an outer axial plug-in strip (26) matching with the outer surface of the outer rotating sleeve (23), and an outer superconducting tape (27) is provided between adjacent outer axial plug-in strips (26); The end surfaces of the axial plug-in strip (12), the inner axial plug-in strip (24) and the outer axial plug-in strip (26) are all provided with a telescopic rod (7) and a pre-compression plate (8), and a spring (9) is sleeved on the telescopic rod (7); A shielding layer is provided on the surface of the pre-pressing plate (8); The outer insulating layer (3) comprises an annular insulating plate (31), an insulating support plug (32) matching the outer axial plug strip (26) is provided on the inner side of the annular insulating plate (31), and a second spring (33) and a pressing plate (34) are provided at the end of the insulating support plug (32).

2. The low-loss high-temperature superconducting cable according to claim 1, characterized in that: The connecting surfaces of the inner rotating sleeve (22) and the outer rotating sleeve (23) are provided with multiple rows of sliding groups distributed axially in parallel; each row of sliding groups includes multiple annularly distributed sliding blocks (14), the sliding blocks (14) are provided with grooves (15), and the grooves (15) are provided with positioning springs (16) and balls (17); The inner and outer walls of the outer cylinder (21) are both provided with multiple rows of annular grooves (211), and the inner bottom surfaces of the annular grooves (211) are provided with positioning grooves (212) that cooperate with the balls (17); the inner and outer walls of the outer cylinder (21) are also provided with axial passages (213) that are connected to the respective annular grooves (211).

3. The production process of a low-loss high-temperature superconducting cable according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Arrange the axial superconducting tape between adjacent axial connecting strips on the outer surface of the central support frame; S2. placing the inner superconducting tape between the inner axial splicing strips of the outer support frame, and placing the outer superconducting tape between the outer axial splicing strips of the outer support frame; S3, then inserting the inner axial plug-in strips of the outer support frame between the axial plug-in strips of the central support frame to achieve compression and fixation of the axial superconducting tape and the inner superconducting tape; S4. Then, insert the corresponding outer support frames in sequence, insert the outer insulation layer into the outermost outer support frame, and press it with the pressing plate; S5. Then, a thermal insulation layer and an outer protective cover are sequentially provided, and an anti-corrosion protective layer is applied on the surface of the outer protective cover.

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