Superconducting cable conductor and preparation method thereof

Abstract

The invention relates to the technical field of superconducting cable conductors, and discloses a superconducting cable conductor and a preparation method thereof, and the superconducting cable conductor comprises a skeleton, the center of the skeleton is provided with a cooling channel, the skeleton is provided with a plurality of sub-cable grooves, the plurality of sub-cable grooves are arranged around the cooling channel, and the plurality of sub-cable grooves are communicated to the peripheral wall of the skeleton; and a plurality of sub-cables, the plurality of sub-cables are arranged in one sub-cable groove, each sub-cable is formed by stacking a plurality of superconducting tapes along the thickness direction, and a protective layer is formed on the peripheral side of each sub-cable. According to the superconducting cable conductor and the preparation method thereof provided by the invention, the superconducting tape is prevented from being damaged when being embedded into the groove of the framework, and the efficiency of arranging the superconducting tape in the groove is improved.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting cable conductors, and in particular to a superconducting cable conductor and a preparation method thereof. Background Art

[0002] REBCO material, as a coated flat ribbon conductor, has attracted extensive attention from the scientific research community due to its anisotropy, high critical magnetic field, high critical current density and excellent mechanical properties. It can carry large currents in a wide range of temperature and magnetic fields, and does not require heat treatment during application. Since the current carrying capacity of a single superconducting tape is limited, multiple superconducting tapes are usually stacked and embedded in the grooves of the conductor skeleton.

[0003] However, when multiple superconducting tapes are embedded into the grooves of the skeleton one by one, the superconducting tapes are easily damaged, and the efficiency of embedding the superconducting tapes into the grooves is low. Summary of the invention

[0004] The object of the present invention is to prevent the superconducting tape from being damaged when being embedded in the groove of the skeleton and to improve the efficiency of arranging the superconducting tape in the groove.

[0005] In order to achieve the above object, the present invention provides a superconducting cable conductor, comprising:

[0006] A frame, wherein a cooling channel is provided at the center of the frame, and a plurality of sub-cable grooves are provided on the frame, wherein the sub-cable grooves are arranged around the cooling channel, and the sub-cable grooves are all connected to the outer peripheral wall of the frame;

[0007] A plurality of sub-cables are arranged in one sub-cable groove, and the sub-cable is formed by stacking a plurality of superconducting tapes along the thickness direction, and a protective layer is formed on the outer peripheral side of the sub-cable.

[0008] Preferably, two of the sub-cable troughs form a group, and the sub-cable troughs of one group are symmetrically distributed relative to the cooling channel.

[0009] Preferably, the sub-cable trough includes multiple layers of branch grooves, which are arranged in sequence from the outside to the inside along the radial direction of the skeleton, and the groove openings of the inner branch grooves are connected to the bottoms of the adjacent outer branch grooves, and the depth of each layer of the branch grooves is the same, and the widths of the multiple layers of the branch grooves decrease in sequence from the outside to the inside along the radial direction of the skeleton.

[0010] Preferably, in the same sub-cable trough, one of the branch troughs is arranged symmetrically relative to a reference plane, wherein the reference plane is centered on the central axis of the cooling channel, the axis perpendicular to the bottom of the sub-cable trough is the reference axis, and the reference axis is extended along the length direction of the cooling channel.

[0011] Preferably, a supplementary cooling channel is provided on a side of each layer of the branch grooves close to the cooling channel, and the supplementary cooling channel is communicated with the corresponding branch grooves.

[0012] Preferably, the sub-cable groove is a spiral groove with the central axis of the cooling channel as the spiral center line.

[0013] Preferably, it also includes:

[0014] A temperature measuring groove is provided on the outer peripheral wall of the frame, the extension direction of the temperature measuring groove and the extension direction of the sub-cable groove are parallel to each other, and a temperature measuring optical fiber is arranged in the temperature measuring groove.

[0015] Preferably, the temperature measuring tank is coated with a heat-conducting layer, the temperature measuring optical fiber is attached to the heat-conducting layer, and the heat-conducting layer is used to fix the temperature measuring optical fiber and conduct heat.

[0016] Preferably, the cross-sectional outer contour of the superconducting cable conductor is circular, and the superconducting cable conductor further comprises:

[0017] Copper foil is arranged on the outside of the frame and is used to fix the sub-cable and the frame; and a spacing space is formed between the copper foil and the sub-cable groove;

[0018] The armor is sleeved on the outer side of the copper foil.

[0019] A method for preparing the above-mentioned superconducting cable conductor comprises the following steps:

[0020] Stacking a plurality of superconducting tapes in the thickness direction and providing a protective layer on the outer circumference to form a sub-cable;

[0021] A plurality of sub-cables are embedded in each sub-cable groove of the skeleton to form a superconducting cable conductor.

[0022] Compared with the prior art, the superconducting cable conductor and the preparation method thereof according to the embodiment of the present invention have the following beneficial effects: a cooling channel is provided at the center of the skeleton, and a refrigerant is injected into the cooling channel to reduce the temperature of the superconducting cable conductor and ensure the safe operation of the superconducting cable conductor;

[0023] The sub-cable is made of multiple superconducting tapes stacked in the thickness direction, and has a protective layer on the outer side;

[0024] A plurality of sub-cable grooves are provided on the skeleton. The plurality of sub-cable grooves are arranged around the cooling channel and connected to the outer peripheral wall of the skeleton. A plurality of sub-cables are arranged in each sub-cable groove. Since the protective layer protects the superconducting tape and increases the mechanical strength of the sub-cable, the superconducting tape is not easily damaged when the sub-cable is arranged in the sub-cable groove. In addition, a plurality of superconducting tapes are stacked and a protective layer is formed on the outer peripheral side. The sub-cable becomes a whole. There is no need to embed the superconducting tapes one by one into the sub-cable groove, thereby improving the efficiency of arranging the superconducting tapes in the groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a superconducting cable conductor according to an embodiment of the present invention;

[0026] Figure 2 is a schematic structural diagram of a sub-cable according to an embodiment of the present invention;

[0027] Figure 3 is a schematic structural diagram of a skeleton according to an embodiment of the present invention;

[0028] Figure 4 is a schematic cross-sectional view of a superconducting cable conductor according to an embodiment of the present invention;

[0029] Figure 5 This is a flow chart of a method for preparing a superconducting cable conductor according to an embodiment of the present invention;

[0030] In the figure, 1. skeleton; 2. cooling channel; 3. sub-cable groove; 31. branch groove; 4. sub-cable; 41. superconducting tape; 42. protective layer; 5. supplementary cooling channel; 6. temperature measuring groove; 7. temperature measuring optical fiber; 8. copper foil; 9. armor. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0033] like Figure 1-2 As shown, a superconducting cable conductor according to an embodiment of the present invention includes:

[0034] A frame 1, a cooling channel 2 is provided at the center of the frame 1, a plurality of sub-cable grooves 3 are provided on the frame 1, the plurality of sub-cable grooves 3 are arranged around the cooling channel 2, and the plurality of sub-cable grooves 3 are all connected to the outer peripheral wall of the frame 1;

[0035] Multiple sub-cables 4 are arranged in one sub-cable groove 3 , and the sub-cable 4 is formed by stacking multiple superconducting tapes 41 along the thickness direction, and a protective layer 42 is formed on the outer peripheral side of the sub-cable 4 .

[0036] It should be noted that a cooling channel 2 is provided at the center of the skeleton 1. Injecting a refrigerant into the cooling channel 2 can reduce the temperature of the superconducting cable conductor and ensure the safe operation of the superconducting cable conductor.

[0037] The sub-cable 4 is formed by stacking a plurality of superconducting tapes 41 in the thickness direction, and has a protective layer 42 on the outer peripheral side;

[0038] A plurality of sub-cable grooves 3 are provided on the skeleton 1, and the plurality of sub-cable grooves 3 are arranged around the cooling channel 2 and connected to the outer peripheral wall of the skeleton 1, and a plurality of sub-cables 4 are arranged in each sub-cable groove 3. Since the protective layer 42 protects the superconducting tape 41 and increases the mechanical strength of the sub-cable 4, when the sub-cable 4 is arranged in the sub-cable groove 3, the superconducting tape 41 is not easily damaged, and a plurality of superconducting tapes 41 are stacked and a protective layer 42 is formed on the outer peripheral side, and the sub-cable 4 becomes a whole, and there is no need to embed the superconducting tapes 41 into the sub-cable groove 3 one by one, thereby improving the efficiency of arranging the superconducting tape 41 in the groove;

[0039] The number of superconducting tapes 41 is preferably 10, and the sub-cable 4 formed by stacking 10 superconducting tapes 41 has a thickness of 0.1 mm, ensuring that it has good mechanical strength;

[0040] The superconducting tape 41 is made of REBCO material. As a coated flat-ribbon conductor, REBCO material can carry a large current in a wide temperature and magnetic field range due to its anisotropy, high critical magnetic field, high critical current density, and excellent mechanical properties. It does not require heat treatment during application. Using REBCO material as a fusion magnet can meet the application requirements of high-field superconducting magnets above 15T.

[0041] The superconducting cable conductor is a CICC slotted core conductor;

[0042] The cooling channel 2 is a one-way flow channel, and the refrigerant is injected from one end thereof and flows out from the other end thereof. The cross-sectional shape of the cooling channel 2 includes but is not limited to a circle or a square.

[0043] See also Figure 1 , 3 and 4 , in a more specific embodiment, two sub-cable troughs 3 form a group, and a group of sub-cable troughs 3 are symmetrically distributed relative to the cooling channel 2 .

[0044] It should be noted that two sub-cable troughs 3 form a group, and a group of sub-cable troughs 3 are symmetrically distributed relative to the cooling channel 2, so that the internal structure of the superconducting cable conductor formed is a coaxial structure, which can improve the anti-interference performance and transmission quality.

[0045] See also Figure 1 , 4 In a more specific embodiment, the sub-cable trough 3 includes multiple layers of branch grooves 31, which are arranged in sequence from the outside to the inside along the radial direction of the skeleton 1, and the groove openings of the inner branch grooves 31 are connected to the bottoms of the adjacent outer branch grooves 31, and the depth of each layer of branch grooves 31 is the same, and the width of the multiple layers of branch grooves 31 decreases in sequence from the outside to the inside along the radial direction of the skeleton 1.

[0046] It should be noted that the depth of the branch grooves 31 of each layer is the same. When the thickness of each superconducting tape 41 is the same, the number of stacked layers of the superconducting tape 41 in the branch grooves 31 of each layer can be ensured to be the same.

[0047] The width of the multi-layer branch grooves 31 decreases from the outside to the inside along the radial direction of the skeleton 1. Therefore, when the width of the single superconducting tape 41 used is the same, the decreasing width is the width of the single superconducting tape 41, which can form an internal structure with a higher space utilization rate of the skeleton, while ensuring the complete embedding of each superconducting tape 41.

[0048] The protective layer 42 can not only improve the mechanical strength of the sub-cable 4, but also prevent the sub-cable 4 from being interfered by the surrounding sub-cables 4. The protective layer 42 is preferably a copper tape;

[0049] from Figure 3 It can be seen that the width ratio of the three layers of branch grooves 31 arranged from the outside to the inside is 3:2:1, the outermost layer of branch grooves 31 is arranged with three sub-cables 4 arranged in parallel, the middle layer of branch grooves 31 is arranged with two sub-cables 4 distributed in parallel, and the innermost layer of branch grooves 31 is arranged with one sub-cable 4.

[0050] See also Figure 1 , 4 In a more specific embodiment, in the same sub-cable trough 3, a branch groove 31 is arranged symmetrically relative to a reference plane, wherein the reference plane is centered on the central axis of the cooling channel 2, the axis perpendicular to the bottom of the sub-cable trough 3 is the reference axis, and the reference axis is extended along the length direction of the cooling channel 2.

[0051] It should be noted that in the same sub-cable trough 3, a branch groove 31 is arranged symmetrically relative to the reference plane, wherein the reference plane is centered on the central axis of the cooling channel 2, and the axis perpendicular to the bottom of the sub-cable trough 3 is the reference axis, and the reference axis is extended along the length direction of the cooling channel 2, so that the widths of both ends of each layer of branch grooves 31 decrease successively, and the cross-section is stepped along the two circumferential sides, ensuring that the internal structure of the superconducting cable conductor is a concentric coaxial structure, thereby improving the anti-interference performance and transmission quality.

[0052] See also Figure 1 , 4 In a more specific embodiment, a supplementary cooling channel 5 is opened on one side of each layer of branch grooves 31 close to the cooling channel 2 , and the supplementary cooling channel 5 is connected to the corresponding branch grooves 31 .

[0053] It should be noted that a supplementary cooling channel 5 is provided on one side of each layer of branch grooves 31 close to the cooling channel 2, and the supplementary cooling channel 5 is connected to the corresponding branch grooves 31. In addition to being injected into the cooling channel 2, the refrigerant can also be injected into the supplementary cooling channel 5. Each supplementary cooling channel 5 can absorb the heat of the sub-cable 4 in each adjacent layer of branch grooves 31, uniformly cool the conductor, and improve the efficiency of cooling and heat dissipation.

[0054] See also Figure 1 , 3 The sub-cable groove 3 is a spiral groove with the central axis of the cooling channel 2 as the spiral center line.

[0055] It should be noted that the sub-cable groove 3 is a spiral groove with the central axis of the cooling channel 2 as the spiral center line, so the sub-cable 4 is twisted when embedded in the sub-cable groove 3, and the structure of the superconducting cable conductor is more stable. The twist pitch of the sub-cable groove 3 is precisely adjusted according to the width of the superconducting tape 41 and the bending radius required by the superconducting cable conductor. A smaller twist pitch enables the superconducting cable conductor to achieve a smaller bending radius, thereby improving its flexibility and adaptability.

[0056] See also Figure 1 , in a more specific embodiment, further comprising:

[0057] The temperature measuring groove 6 is provided on the outer peripheral wall of the frame 1 . The extending direction of the temperature measuring groove 6 and the extending direction of the sub-cable groove 3 are parallel to each other. A temperature measuring optical fiber 7 is arranged in the temperature measuring groove 6 .

[0058] It should be noted that the temperature measuring optical fiber 7 is arranged in the temperature measuring groove 6 opened on the outer wall of the skeleton 1. The temperature measuring optical fiber 7 can obtain accurate temperature data of the conductor surface in real time through the optical fiber distributed temperature measurement technology. When the temperature is abnormal, it can be repaired in time to avoid the long-term temperature abnormality affecting the stable operation of the conductor, thereby ensuring the safety and reliability of the conductor during operation.

[0059] There may be a plurality of temperature measuring grooves 6 , which are evenly distributed along the outer peripheral wall of the skeleton 1 , so as to measure the temperature at various locations on the conductor surface.

[0060] See also Figure 1 In a more specific embodiment, the temperature measuring tank 6 is coated with a heat-conducting layer (not shown in the figure), the temperature measuring optical fiber 7 is attached to the heat-conducting layer, and the heat-conducting layer is used to fix the temperature measuring optical fiber 7 and conduct heat.

[0061] It should be noted that the heat-conducting layer can not only effectively fix the position of the temperature measuring optical fiber 7 to ensure the stability of the measurement, but also quickly conduct heat in the temperature measuring tank 6, thereby improving the response speed and accuracy of temperature monitoring;

[0062] The heat-conducting layer is preferably thermally conductive silicone grease.

[0063] See also Figure 1 In a more specific embodiment, the cross-sectional outer contour of the superconducting cable conductor is circular, and the superconducting cable conductor further comprises:

[0064] The copper foil 8 is arranged on the outside of the frame 1 and is used to fix the sub-cable 4 and the frame 1; and a spacing space is formed between the copper foil 8 and the sub-cable groove 3;

[0065] The armor 9 is sleeved on the outer side of the copper foil 8 .

[0066] It should be noted that a copper foil 8 is disposed on the outside of the frame 1, and the copper foil 8 fixes the frame 1 and the sub-cable 4, which can improve the rigidity and stability of the conductor as a whole;

[0067] Since the outer side of the sub-cable 4 arranged in the sub-cable trough 3 is a plane, and the cross-sectional profile of the copper foil 8 is a circle, a spacing space is formed between the copper foil 8 and the sub-cable 4 in the sub-cable trough 3, and the space can allow the refrigerant or cooling medium to pass through to cool the sub-cable 4, and a certain space can be provided to avoid stress concentration during the process of winding the conductor into a coil;

[0068] Furthermore, the uniform pressure of the copper foil 8 on the sub-cable 4 and the skeleton 1 promotes the heat conduction and mechanical coupling between the stacked superconducting tapes 41 and the skeleton 1, thus laying a solid foundation for the subsequent armor 9.

[0069] Armor 9 is arranged outside copper foil 8, and armor 9 can withstand the Ampere force faced by the conductor, ensuring that the internal structure of the conductor will not be damaged due to excessive force, and at the same time work in the environment of high current and strong magnetic field to avoid being affected by strong electromagnetic force. Armor 9 can not only protect the conductor from the adverse effects of the external environment, but also maintain the integrity and functionality of the conductor under the action of electromagnetic force.

[0070] See also Figure 1-5A method for preparing a superconducting cable conductor according to an embodiment of the present invention comprises the following steps:

[0071] A plurality of superconducting tapes 41 are stacked in the thickness direction, and a protective layer 42 is provided on the outer circumference to form a sub-cable 4;

[0072] A plurality of sub-cables 4 are arranged in each sub-cable groove 3 of the skeleton 1 to form a superconducting cable conductor.

[0073] The working process of the present invention is as follows: a plurality of superconducting tapes 41 are stacked in the thickness direction, and a protective layer 42 is provided on the outer peripheral side to form a sub-cable 4; a plurality of sub-cables 4 are arranged in each sub-cable groove 3. Since the protective layer 42 protects the superconducting tape 41 and increases the mechanical strength of the sub-cable 4, when the sub-cable 4 is arranged in the sub-cable groove 3, the superconducting tape 41 is not easily damaged. Moreover, a plurality of superconducting tapes 41 are stacked and a protective layer 42 is formed on the outer peripheral side. The sub-cable 4 becomes a whole. There is no need to embed the superconducting tapes 41 into the sub-cable groove 3 one by one, thereby improving the efficiency of arranging the superconducting tapes 41 in the groove. Injecting refrigerant into the cooling channel 2 can reduce the temperature of the superconducting cable conductor and ensure the safe operation of the superconducting cable conductor.

[0074] In summary, the embodiments of the present invention provide a superconducting cable conductor and a method for manufacturing the same, which prevents the superconducting tape 41 from being damaged when embedded in the slot of the skeleton 1 and improves the efficiency of arranging the superconducting tape 41 in the slot.

[0075] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A superconducting cable conductor, characterized in that: include: A frame, wherein a cooling channel is provided at the center of the frame, and a plurality of sub-cable grooves are provided on the frame, wherein the sub-cable grooves are arranged around the cooling channel, and the sub-cable grooves are all connected to the outer peripheral wall of the frame; A plurality of sub-cables are arranged in one sub-cable groove, and the sub-cable is formed by stacking a plurality of superconducting tapes along the thickness direction, and a protective layer is formed on the outer peripheral side of the sub-cable.

2. The superconducting cable conductor according to claim 1, characterized in that: Two of the sub-cable troughs form a group, and the sub-cable troughs of one group are symmetrically distributed relative to the cooling channel.

3. The superconducting cable conductor according to claim 2, characterized in that: The sub-cable trough includes multiple layers of branch grooves, which are arranged in sequence from the outside to the inside along the radial direction of the skeleton, and the groove openings of the inner branch grooves are connected to the bottoms of the adjacent outer branch grooves, and the depth of each layer of the branch grooves is the same, and the widths of the multiple layers of the branch grooves decrease in sequence from the outside to the inside along the radial direction of the skeleton.

4. The superconducting cable conductor according to claim 3, characterized in that: In the same sub-cable trough, one branch trough is arranged symmetrically relative to a reference plane, wherein the reference plane is centered on the central axis of the cooling channel, the axis perpendicular to the bottom of the sub-cable trough is the reference axis, and the reference axis is extended along the length direction of the cooling channel.

5. The superconducting cable conductor according to claim 3, characterized in that: A supplementary cooling channel is provided on one side of each layer of the branch grooves close to the cooling channel, and the supplementary cooling channel is communicated with the corresponding branch grooves.

6. The superconducting cable conductor according to claim 1, characterized in that: The sub-cable groove is a spiral groove with the central axis of the cooling channel as the spiral center line.

7. The superconducting cable conductor according to claim 1, characterized in that: Also includes: A temperature measuring groove is provided on the outer peripheral wall of the frame, the extension direction of the temperature measuring groove and the extension direction of the sub-cable groove are parallel to each other, and a temperature measuring optical fiber is arranged in the temperature measuring groove.

8. The superconducting cable conductor according to claim 7, characterized in that: The temperature measuring tank is coated with a heat-conducting layer, the temperature measuring optical fiber is attached to the heat-conducting layer, and the heat-conducting layer is used to fix the temperature measuring optical fiber and conduct heat.

9. The superconducting cable conductor according to claim 1, characterized in that: The cross-sectional outer contour of the superconducting cable conductor is circular, and the superconducting cable conductor further comprises: Copper foil is arranged on the outside of the frame and is used to fix the sub-cable and the frame; and a spacing space is formed between the copper foil and the sub-cable groove; The armor is sleeved on the outer side of the copper foil.

10. A method for preparing the superconducting cable conductor according to any one of claims 1 to 9, characterized in that: The following steps are involved: Stacking a plurality of superconducting tapes in a thickness direction and providing a protective layer on the outer circumference to form a sub-cable; A plurality of sub-cables are arranged in each sub-cable groove of the skeleton to form a superconducting cable conductor.

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