Low-loss high-temperature superconducting cable and production process

Abstract

The low-loss high-temperature superconducting cable comprises a central supporting framework, the central supporting framework is sleeved with an outer supporting framework, the outer side of the outer supporting framework on the outermost layer is sequentially provided with an outer insulating layer, a heat preservation layer and an outer protection sleeve, and the outer protection sleeve is further externally provided with an anti-corrosion protection layer; the center supporting framework comprises a center cylinder of a hollow cylindrical structure, axial inserting strips are arranged on the outer surface of the center cylinder, and axial superconducting strips located on the surface of the center cylinder are arranged between the adjacent axial inserting strips. The outer supporting framework comprises an outer cylinder of a hollow cylindrical structure, an inner rotating sleeve and an outer rotating sleeve are arranged on the inner side and the outer side of the outer cylinder respectively, inner axial inserting strips matched with the axial inserting strips are arranged on the inner surface of the inner rotating sleeve, and inner superconducting strips are arranged between the adjacent inner axial inserting strips. The outer surface of the outer rotating sleeve is provided with outer axial inserting strips which are matched with each other, and an outer superconducting strip is arranged between every two adjacent outer axial inserting strips. The method has the characteristic that the loss can be effectively reduced.

Description

Technical Field

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

[0002] As the most promising superconducting power equipment in the current superconducting power technology field, superconducting cables have a significant advantage over traditional cables in transmitting power due to their zero resistance characteristics, and can achieve low-voltage, high-current, and high-energy-density power transmission. At the same voltage level, superconducting cables have significantly higher power transmission capabilities and less floor space than ordinary cables. At present, the tapes in existing high-temperature superconducting cables are generally stacked inside and outside in sequence, but the tapes are too close, which will lead to large AC losses; and the number of stacked layers of tapes is also small. Therefore, the existing technology has the problem of large 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 the loss.

[0004] The technical solution of the present invention is as follows: a low-loss high-temperature superconducting cable comprises a central support frame, one or more concentrically distributed outer support frames are arranged outside the central support frame, an outer insulating layer, a heat preservation 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 arranged outside the outer protective sheath;

[0005] The central support skeleton comprises a central tube of a hollow cylindrical structure, a group of axial plug-in strips with a T-shaped cross section and annular distribution are arranged on the outer surface of the central tube, and an axial superconducting tape located on the surface of the central tube is arranged between adjacent axial plug-in strips;

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

[0007] In the aforementioned low-loss high-temperature superconducting cable, the end faces of the axial plug-in strip, the inner axial plug-in strip and the outer axial plug-in strip are all provided with telescopic rods and pre-stressing 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 comprises an annular insulating plate, an insulating support plug matching the outer axial plug strip is provided inside the annular insulating plate, and a second spring and a clamping plate are provided at the end of the insulating support plug.

[0010] In the aforementioned low-loss high-temperature superconducting cable, the connection 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 sliding blocks arranged in an annular manner, the sliding blocks are provided with grooves, and positioning springs and balls are arranged in the grooves;

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

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

[0013] S1, placing the axial superconducting tape between adjacent axial plug-in strips on the outer surface of the central support frame;

[0014] S2, placing the inner superconducting tape between the inner axial plug-in strips of the outer support frame, and placing the outer superconducting tape between the outer axial plug-in 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 a pressing plate;

[0017] S5. Then, a thermal insulation layer and an outer protective cover are sequentially arranged, 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 is composed 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 losses; and the number of stacked layers of the tape can also be increased to improve the power transmission capacity. At the same time, the inner and outer sides of the outer support skeleton of the present application are provided with rotatable inner rotating sleeves and outer rotating sleeve structures, so that the staggered positions between the inner and outer superconducting tapes can be flexibly adjusted to further reduce AC losses. 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 schematic diagram of the structure 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 markings 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-central 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-pressing 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 is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0025] Embodiment. A low-loss high-temperature superconducting cable, comprising: Figure 1-4 As shown, it comprises a central support frame 1, one or more concentrically distributed outer support frames 2 are arranged outside the central support frame 1, an outer insulating layer 3, a heat preservation layer 4 and an outer protective cover 5 are arranged on the outer side of the outermost outer support frame 2 in sequence, and an anti-corrosion protective layer 6 is also arranged outside the outer protective cover 5;

[0026] The central support frame 1 comprises a central tube 11 of a hollow cylindrical structure, a group of axial plug-in strips 12 of annular distribution and T-shaped cross section are arranged on the outer surface of the central tube 11, and axial superconducting tapes 13 located on the surface of the central tube 11 are arranged between adjacent axial plug-in strips 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 comprises an annular insulating plate 31 , an insulating support plug 32 matching with the outer axial plug strip 3 is arranged inside the annular insulating plate 31 , and a second spring 33 and a pressing plate 34 are arranged 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, and the sliders 14 are provided with grooves 15, and positioning springs 16 and balls 17 are arranged in the grooves 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 surfaces of the annular grooves 211 are provided with positioning grooves 212 that match the balls 17; the inner and outer wall surfaces of the outer cylinder 21 are also provided with axial passages 213 connected to each annular groove 211.

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

[0033] S1, placing the axial superconducting tape between adjacent axial plug-in strips on the outer surface of the central support frame;

[0034] S2, placing the inner superconducting tape between the inner axial plug-in strips of the outer support frame, and placing the outer superconducting tape between the outer axial plug-in 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 a pressing plate;

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

[0038] The end faces of the axial connector, the inner axial connector and the outer axial connector are all provided with telescopic rods, springs and pre-compression plates, and the surface of the pre-compression plate is also provided with a shielding layer, so as to ensure the adaptive compression of the corresponding superconducting tapes and reduce AC losses.

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

[0040] The axial hollow part in the outer cylinder is provided with a liquid nitrogen channel. The outer cylinder is also provided with an axial cooling and heat dissipation channel, so that multiple heat dissipation can be achieved and the heat dissipation and cooling effect can be improved.

[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 sliders move along the annular grooves.

[0042] The production process of the present invention is as follows: an axial superconducting tape is arranged on the bottom surface between adjacent axial plug-in strips on the outer surface of a central support skeleton, an inner superconducting tape is arranged on the inner bottom surface between the inner axial plug-in strips of an outer support skeleton, an outer superconducting tape is arranged on the outer bottom surface between the outer axial plug-in strips of an 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 achieve compression and fixation of the axial superconducting tape and the inner superconducting tape, and then the corresponding outer support skeletons are inserted in turn, an outer insulating layer is inserted into the outermost outer support skeleton, and compression is performed by a compression plate, and then a thermal insulation layer and an outer protective cover are arranged in turn, and an 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 in that: The invention comprises a central support frame (1), one or more concentrically distributed outer support frames (2) are arranged outside the central support frame (1), an outer insulating layer (3), a heat preservation layer (4) and an outer protective cover (5) are arranged in sequence outside the outermost outer support frame (2), and an anti-corrosion protective layer (6) is also arranged outside the outer protective cover (5); The central support frame (1) comprises a central tube (11) of a hollow cylindrical structure, a group of axial plug-in strips (12) of annular distribution and 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), 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 axial plug-in strip (26) is provided on 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).

2. The low-loss high-temperature superconducting cable according to claim 1, characterized in that: 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).

3. The low-loss high-temperature superconducting cable according to claim 2, characterized in that: A shielding layer is provided on the surface of the pre-pressing plate (8).

4. The low-loss high-temperature superconducting cable according to claim 3, characterized in that: The outer insulating layer (3) comprises an annular insulating plate (31), an insulating support plug (32) matching the outer axial plug strip (3) 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).

5. The low-loss high-temperature superconducting cable according to claim 4, characterized in that: The connecting surfaces of the inner rotating sleeve (22) and the outer rotating sleeve (23) are both provided with a plurality of rows of sliding groups which are axially arranged in parallel; each row of sliding groups comprises a plurality of sliding blocks (14) which are annularly arranged, and 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 wall surfaces of the outer cylinder (21) are both provided with a plurality of rows of annular grooves (211), and the inner bottom surface of the annular grooves (211) is provided with positioning grooves (212) that match the balls (17); the inner and outer wall surfaces of the outer cylinder (21) are also provided with axial passages (213) that are connected to each annular groove (211).

6. A production process for a low-loss high-temperature superconducting cable according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, placing the axial superconducting tape between adjacent axial plug-in strips on the outer surface of the central support frame; S2, placing the inner superconducting tape between the inner axial plug-in strips of the outer support frame, and placing the outer superconducting tape between the outer axial plug-in 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 a pressing plate; S5. Then, a thermal insulation layer and an outer protective cover are sequentially arranged, and an anti-corrosion protective layer is applied on the surface of the outer protective cover.

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