Superconducting bunched cable with independent cooling channels

Abstract

The invention relates to the technical field of superconducting wire harnesses, in particular to a superconducting bunched cable with independent cooling channels. The cooling device comprises a framework with a circular cross section, an inwards-concave wire groove is formed in the outer side of the framework in the axial direction, and an inner cooling channel is formed in the middle of the framework along the axis. The superconducting strips are arranged in the wire slots; and the outer sheath is hermetically sleeved on the outer side of the framework. The requirement of the controllable nuclear fusion superconducting magnet coil for the current-carrying capacity can be met through the wire ducts arranged on the framework according to requirements and the superconducting strips with the adjustable number in the wire ducts, the controllable nuclear fusion superconducting magnet coil has the advantage of being large in current-carrying capacity, the current-carrying capacity can be flexibly adjusted, the capacity of current-carrying expansion is achieved, the superconducting strips do not need to be woven and bound, and the cost is reduced. The cable is only required to be laid in the wire duct, fixed and hermetically sleeved with the outer sheath, and the preparation process is simple; a stable low-temperature environment is provided for the superconducting bunched cable through the independently arranged cooling channel; therefore, the superconducting magnet coil can be applied to controllable nuclear fusion superconducting magnet coils.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting wire bundles, in particular to a superconducting bundled cable with an independent cooling channel. Background Art

[0002] With the continuous advancement of high-temperature superconducting material preparation technology, the critical current of a single superconducting tape under self-field can reach 200-300A, laying the foundation for the development of applied superconducting technology. However, in controlled nuclear fusion devices, the current carrying capacity of a single superconducting tape can no longer meet the needs of practical applications, so superconducting bundled cables with high current carrying performance are currently a development trend. Superconducting bundled cables form an integral structure by combining multiple superconducting tapes in a specific weaving, stacking or twisting manner. This structure can make full use of the characteristics of superconducting materials and improve the efficiency and stability of current transmission. In the superconducting state, current can flow losslessly inside the cable, thereby achieving efficient energy transmission.

[0003] At present, there are mainly two types of superconducting composite conductors at home and abroad.

[0004] One type is the HTS Roebel Cable superconducting bundled cable, which was jointly developed by General Cable Superconductor Co., Ltd. of New Zealand and Victoria University of New Zealand. Figure 1 As shown, it is made of multiple superconducting tapes twisted and woven in a specific way to form a bundle structure.

[0005] The other type is twisted stacked composite conductor, which is to stack multiple superconducting tapes and tie them with steel wire to fix the torsion pitch of the multiple tapes. However, the binding cannot be too tight. There needs to be a certain gap between the layers of tapes so that the tapes between the layers can move relatively. Figure 2 As shown, the conductor is fixed with liquid solder outside according to the maximum extent of the strip movement, and the superconducting bundled cable can be applied to superconducting magnet coils in large-capacity superconducting energy storage systems.

[0006] The two existing superconducting composite conductors have their own advantages and disadvantages in performance. HTS Roebel Cable superconducting bundled cable has been commercialized. It has high current density and low AC loss. However, it is very difficult to expand its current carrying capacity due to its specific twisted and woven structure, and its manufacturing difficulty is high. Twisted stacked composite conductors have not yet been commercialized. They have high current density and can expand current carrying capacity. The manufacturing difficulty is moderate, but the stacking setting will produce certain AC losses, reducing superconducting performance. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention provides a superconducting bundled cable with an independent cooling channel, which has a large current carrying capacity, can conveniently expand the current carrying capacity, and has a simple preparation process.

[0008] The present invention is achieved through the following technical solutions: The present invention provides a superconducting bundled cable with independent cooling channels, comprising: A frame with a circular cross section, an inwardly concave wire groove is provided on the outer side of the frame along the axial direction, and an inner cooling channel is provided in the middle along the axis; A superconducting tape disposed in each slot; The airtight sleeve is arranged on an outer sheath outside the frame.

[0009] Optionally, the number of the wire slots is 2 to 14, and they are evenly distributed on the outside of the skeleton.

[0010] Optionally, the wire groove is parallel to the central axis of the frame and is arranged in a straight groove body.

[0011] Optionally, the wire grooves are arranged in a spiral structure along the surface of the skeleton, so as to facilitate the natural displacement of the superconducting tape in each wire groove.

[0012] Optionally, the skeleton is made of copper, aluminum or stainless steel.

[0013] Optionally, the superconducting tape arranged in each wire slot is arranged in a single layer or a multi-layer arrangement.

[0014] Optionally, buckles are provided inwardly on both sides of the slot opening of the wire slot, and a limiting stay is placed on the superconducting tape, and the outer side of the limiting stay is pressed and engaged with the buckles.

[0015] Optionally, the outer sheath is configured as a circular outer sheath.

[0016] Optionally, the outer sheath is configured as a rectangular outer sheath.

[0017] Optionally, outer cooling channels are symmetrically opened at the corners of the rectangular outer jacket, and the outer cooling channels are arranged in parallel with the inner cooling channels.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention can meet the demand for current carrying capacity of superconducting magnet coils for controlled nuclear fusion by means of wire grooves arranged on the skeleton according to demand and superconducting tapes with adjustable quantity in the wire grooves. The present invention not only has the advantage of large current carrying capacity, but also can flexibly adjust the current carrying capacity and has the ability to expand the current carrying capacity. The superconducting tapes do not need to be woven and bundled, but only need to be laid in the wire grooves, fixed and sealed with outer sheaths, and the preparation process is simple. A stable low-temperature environment is provided for the superconducting bundled cables through independently arranged cooling channels. Thus, the present invention can be applied to superconducting magnet coils for controlled nuclear fusion.

[0019] Furthermore, the superconducting bundled cable skeleton provided by the present invention is grooved along the surface of the skeleton into a multi-strand spiral structure, which can realize the natural transposition of the wires in each groove, minimize the circulating current between the wires, and has the function of self-transposition.

[0020] Furthermore, the rectangular outer sheath provided by the present invention can be provided with holes on all sides to serve as cooling channels, thereby enhancing the cooling effect of the superconducting bundled cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the HTS Roebel Cable superconducting bundled cable in the prior art.

[0022] Figure 2 It is a schematic diagram of a bundled superconducting bundled cable in the prior art.

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the four-slot superconducting bundled cable skeleton described in an example of the present invention.

[0024] Figure 4 It is a schematic diagram of the cross-sectional structure of the eight-slot superconducting bundled cable skeleton described in an example of the present invention.

[0025] Figure 5 It is a schematic diagram of the skeleton structure of the fourteen-slot superconducting cluster cable described in an example of the present invention.

[0026] Figure 6 This is a diagram showing the structure and assembly layout of a single layer of superconducting tape stacked and fixed in a line slot in an example of the present invention.

[0027] Figure 7 This is a diagram showing the structure and assembly layout of the multi-layer superconducting tapes stacked and fixed in the line slots in an example of the present invention.

[0028] Figure 8 It is a cross-sectional view of a superconducting bundled cable with a circular outer sheath in an example of the present invention.

[0029] Fig. 9 It is a cross-sectional view of a superconducting bundled cable with a rectangular outer sheath in an example of the present invention.

[0030] In the figure: skeleton 1, wire slot 101, inner cooling channel 102, superconducting tape 2, outer sheath 3, buckle 1011, limiting stay 4, outer cooling channel 301. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the structures related to the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted 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 directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0035] In view of the advantages and disadvantages of the two superconducting bundle cables described in the prior art, the present invention provides a superconducting bundle cable with an independent cooling channel for controlled nuclear fusion, which mainly includes a skeleton 1, a conductor layer formed by a superconducting tape 2, and an outer sheath 3, and generally provides two types of technical solutions.

[0036] Among them, the skeleton 1 is used as a support for the superconducting cluster cable, and its cross section is circular, with an inwardly concave wire groove 101 provided along the axial direction on the outer side, and an inner cooling channel 102 provided along the axis in the middle; the inner cooling channel 102 located at the center of the skeleton 1 can be fed with liquid nitrogen, liquid helium, etc. to cool the superconducting cluster cable, providing a stable low-temperature environment for the superconducting cluster cable. The material of the skeleton 1 can be copper, aluminum or stainless steel; the copper skeleton 1 can increase the stability of the cluster cable, and shunt when the superconducting cluster cable quenches; the aluminum skeleton 1 is light in material, and can also shunt current after quenching; the stainless steel skeleton 1 can increase the overall strength of the superconducting cluster cable.

[0037] The skeleton 1 of the present invention takes into account both structural stability and material optimization. As the core support structure of the superconducting bundled cable, it directly determines the overall performance of the cable. The skeleton 1 of the present invention has a circular cross-section, which is not only conducive to resisting external pressure and distortion, but also can achieve optimal configuration in the internal space. The outer side of the skeleton 1 is specially provided with concave wire grooves 101 along the axial direction. These wire grooves 101 not only provide a laying path for the superconducting tape 2, but also optimize the current distribution through reasonable layout.

[0038] The present invention creatively opens an inner cooling channel 102 at the center of the skeleton 1. This channel can be fed with high-efficiency cooling media such as liquid nitrogen and liquid helium to provide a continuous low-temperature environment for the superconducting tape 2, ensuring the stable performance of its superconducting performance.

[0039] The material selection of the skeleton 1 is also crucial. The present invention provides three material options: copper, aluminum and stainless steel to meet the needs of different application scenarios. The copper skeleton 1 can provide an effective shunt path when the superconducting bundled cable is quenched due to its excellent conductivity and stability; the aluminum skeleton 1 is lightweight, easy to transport and install, and also has the ability to shunt when the superconducting bundled cable is quenched; and the stainless steel skeleton 1 is an ideal choice for harsh environments due to its high strength and corrosion resistance.

[0040] The wire grooves 101 are grooves set on the frame 1, and the number of wire grooves 101 is selected according to specific needs. In this preferred embodiment, the number that can be set is 2 to 14, which is suitable for small and medium-sized superconducting magnet coils. If it is large or super-large, it can be slotted according to needs, so there is no limit on the number of wires, which provides great flexibility for laying the superconducting tape 2. Further preferably, as Figure 3 , Figure 4 and Figure 5 , can be four slots, six slots or fourteen slots, where Figure 3 and Figure 4 The wire groove 101 is a straight groove 101 parallel to the central axis. Figure 5The wire grooves 101 are arranged in a multi-strand spiral along the surface of the skeleton 1, which can realize the natural displacement of the superconducting tape 2 in each groove and minimize the circulation between the superconducting tapes 2, but the wire grooves 101 are still arranged in a spiral along the axial direction.

[0041] The laying and fixing of the superconducting tape 2 is a key step in achieving the performance of the superconducting bundled cable. The present invention lays the superconducting tape 2 in each cable trough 101; the superconducting tape 2 is laid flat in the cable trough 101, and can be Figure 6 The superconducting tape stack shown in a single layer arrangement can also be Figure 7 The stacked multi-layer superconducting tapes are shown, and the number of superconducting tapes 2 in each slot is three, which can be flexibly adjusted according to the conductor of the transmission current capacity; the limiting stays 4 are tightly set on the outermost superconducting tapes 2. In this preferred embodiment, the outer side of the limiting stays 4 is tightly clamped with the buckles 1011 set inwardly on both sides of the slot 101; specifically, as shown in FIG. Figure 6 and Figure 7 As shown, the thickness of the limiting stay 4 is related to the number of superconducting tapes 2 to be fixed. Figure 6 The thickness of a superconducting tape 2 and a limiting stay 4 is set in the middle, Figure 7 There are three superconducting tapes 2 and one limiting stay 4. Because the depth of the wire groove 101 is fixed, the more superconducting tapes 2 are stacked, the smaller the thickness of the limiting stay 4 is. This solution not only ensures the close arrangement of the superconducting tapes 2, but also improves the overall structural stability of the cable. In the figure, the cross section of the buckle 1011 is set in a right triangle, with the hypotenuse inclined inward, and the corresponding outer corner of the limiting stay 4 is set in a matching chamfer. The limiting stay 4 is used to fix the superconducting tape 2. The outside of the superconducting tape 2 is respectively wrapped with an insulating layer, which shows the insulation requirements of the superconducting tape 2.

[0042] The outer sheath 3 is hermetically sleeved on the outside of the skeleton 1; the outer sheath 3 adopts a fully enclosed structure, which is suitable for the establishment of a forced internal cooling circulation system. As the last line of defense of the superconducting bundled cable, the outer sheath 3 is also very important. The present invention provides two outer sheath 3 structural options, circular and rectangular, to meet the needs of different application scenarios. And as Figure 8 and Fig. 9 As shown, the structure of the outer sheath 3 can be a circular outer sheath 3 or a rectangular outer sheath 3. The rectangular outer sheath 3 can be opened on all sides as an outer cooling channel 301 to enhance the cooling effect of the superconducting bundled cable.

[0043] The circular outer sheath 3 has a simple structure and is easy to manufacture, and is suitable for most application scenarios. Its fully enclosed structure facilitates the establishment of a forced internal cooling circulation system.

[0044] The rectangular outer sheath 3 has holes on all sides as external cooling channels 301, which enhance the cooling effect of the superconducting bundled cable. This solution is particularly suitable for application scenarios that require high heat dissipation performance, such as superconducting magnet systems in controlled nuclear fusion reactors. The position and number of the holes in the rectangular outer sheath 3 can be flexibly adjusted according to actual needs to achieve the best cooling effect.

[0045] The present invention combines the above-mentioned scheme with Figure 8 and Fig. 9 Taking the above structure as an example, two specific examples are given.

[0046] Example 1 The present invention discloses a superconducting bundled cable with an independent cooling channel. This example shows how to achieve structural stability and cooling effect of the superconducting bundled cable by optimizing the layout of the skeleton 1, the cable trough 101, and the laying and fixing of the superconducting tape 2. The setting of the inner cooling channel 102 ensures the stable operation of the superconducting tape 2 in a low temperature environment. Figure 8 As shown, it includes a skeleton 1 with a circular cross section, 8 concave wire grooves 101 are provided along the axial direction on the outer side of the skeleton 1, and an inner cooling channel 102 is provided along the axis in the middle; the 8 wire grooves 101 are evenly arranged and have the same depth. The superconducting tape 2 arranged in each wire groove 101 can be flexibly adjusted according to the current carrying needs, and the wire groove 101 is completely filled after being fixed by the limiting support bar 4; a circular outer sheath 3 is sealed on the outer side of the skeleton 1. Liquid nitrogen, liquid helium, etc. are introduced into the inner cooling channel 102 in the middle to cool the superconducting bundle cable, providing a stable low-temperature environment for the superconducting bundle cable.

[0047] Among them, the line groove 101 is a groove set on the skeleton 1, which can be set as a straight groove 101 parallel to the central axis, or it can be set as multiple spirals along the surface of the skeleton 1, which can realize the natural displacement of the superconducting tape 2 in each groove and minimize the circulation between the superconducting tapes 2, but the line groove 101 is still set in a spiral along the axial direction.

[0048] The present invention lays a superconducting tape 2 in each wire slot 101; the superconducting tape 2 is laid flat in the wire slot 101, and can be Figure 6 As shown in the single layer arrangement, it can also be Figure 7 The stack of superconducting tapes 2 shown in the stack is arranged in multiple layers, and the number of superconducting tapes 2 in each slot is flexibly adjustable according to the conductor with the transmission current capacity; the outermost superconducting tape 2 is pressed and arranged with a limiting stay 4. The thickness of the limiting stay 4 is related to the number of superconducting tapes 2 to be fixed, because the depth of the wire slot 101 is fixed, so the more superconducting tapes 2 are stacked, the smaller the thickness of the limiting stay 4; the limiting stay 4 is used to fix the superconducting tape 2.

[0049] Example 2 like Fig. 9As shown, a superconducting cluster cable with independent cooling channels of the present invention comprises a skeleton 1 with a circular cross section, 8 concave wire grooves 101 are provided along the axial direction on the outer side of the skeleton 1, and an inner cooling channel 102 is provided along the axis in the middle; the 8 wire grooves 101 are arranged evenly and have the same depth. The superconducting tape 2 arranged in each wire groove 101 can be flexibly adjusted according to the current carrying needs, and the wire groove 101 is completely filled after being fixed by the limiting support bar 4; a rectangular outer sheath 3 is sealed on the outer side of the skeleton 1; the outer sheath of the rectangle is opened around, as an outer cooling channel 301, and in this preferred embodiment, the four corners are opened and arranged symmetrically, which can cooperate with the inner cooling channel 102 to cool from both the inside and the outside, and the cooling is uniform, and the adjustable cooling range is wide, and the inner cooling channel 102 and the outer cooling channel 301 can both be passed with liquid nitrogen, liquid helium, etc. to cool the superconducting cluster cable, and the setting of the outer cooling channel 301 can enhance the cooling effect of the superconducting cluster cable.

[0050] Among them, the line groove 101 is a groove set on the skeleton 1, which can be set as a straight groove 101 parallel to the central axis, or it can be set as multiple spirals along the surface of the skeleton 1, which can realize the natural displacement of the superconducting tape 2 in each groove and minimize the circulation between the superconducting tapes 2, but the line groove 101 is still set in a spiral along the axial direction.

[0051] The present invention lays a superconducting tape 2 in each wire slot 101; the superconducting tape 2 is laid flat in the wire slot 101, and can be Figure 6 As shown in the single layer arrangement, it can also be Figure 7 The stack of superconducting tapes 2 shown in the stack is arranged in multiple layers, and the number of superconducting tapes 2 in each slot is flexibly adjustable according to the conductor with the transmission current capacity; the outermost superconducting tape 2 is pressed and arranged with a limiting stay 4. The thickness of the limiting stay 4 is related to the number of superconducting tapes 2 to be fixed, because the depth of the wire slot 101 is fixed, so the more superconducting tapes 2 are stacked, the smaller the thickness of the limiting stay 4; the limiting stay 4 is used to fix the superconducting tape 2.

[0052] The superconducting cluster cable with independent cooling channels for controlled nuclear fusion provided by the present invention performs well in terms of structural stability, cooling effect, scope of application and innovation. In a controlled nuclear fusion device, superconducting cluster cables can be used to transmit large currents to achieve efficient energy conversion and utilization. It can also be used in superconducting energy storage systems, using its high current-carrying capacity superconducting cables to store and release energy. Superconducting cluster cables can meet this demand and improve the performance and efficiency of energy storage systems. And it can be used in superconducting magnetic levitation transportation systems. Superconducting magnetic levitation transportation systems require stable current transmission to maintain the suspension and propulsion of trains, and can provide stable current transmission to ensure the safety and reliability of transportation systems. It can also be used in the medical field and can be used in equipment such as magnetic resonance imaging to improve the clarity and resolution of images.

[0053] The solution of the present invention not only overcomes the shortcomings of the existing technology, but also provides new ideas and directions for the application and development of superconducting technology. In the future, with the continuous development of superconducting technology and the continuous expansion of application fields, the superconducting bundled cable solution proposed by the present invention will have broader application prospects and market potential.

[0054] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0055] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of this invention. The technical scope of this invention is not limited to the content in the specification, and the technology must be determined according to the scope of the claims.

Claims

1. A superconducting bundled cable with independent cooling channels, characterized in that: include, A frame (1) having a circular cross section, wherein an inwardly concave wire groove (101) is provided on the outer side of the frame (1) along the axial direction, and an inner cooling channel (102) is provided in the middle along the axis; A superconducting tape (2) arranged in each wire slot (101); An outer protective sleeve (3) is sealed and arranged outside the frame (1).

2. A superconducting bundled cable with independent cooling channels according to claim 1, characterized in that: The number of the wire slots (101) is 2 to 14, and they are evenly distributed on the outside of the frame (1).

3. The superconducting bundled cable with independent cooling channels according to claim 1, characterized in that: The wire groove (101) is parallel to the central axis of the frame (1) and is arranged in a straight groove body.

4. The superconducting bundled cable with independent cooling channels according to claim 1, characterized in that: The wire grooves (101) are arranged in a spiral structure along the surface of the skeleton, and are used for the natural transposition of the superconducting tape in each wire groove (101).

5. The superconducting bundled cable with independent cooling channels according to claim 1, characterized in that: The frame (1) is made of copper, aluminum or stainless steel.

6. The superconducting bundled cable with independent cooling channels according to claim 1, characterized in that: The superconducting tape (2) arranged in each wire slot (101) is arranged in a single layer or in multiple layers.

7. A superconducting bundled cable with independent cooling channels according to any one of claims 1 to 6, characterized in that: Buckles (1011) are arranged inwardly on both sides of the slot opening of the wire slot (101), and a limiting stay (4) is placed on the superconducting tape (2), and the outer side of the limiting stay (4) is pressed and locked with the buckles (1011).

8. The superconducting bundled cable with independent cooling channels according to claim 1, characterized in that: The outer sheath (3) is configured as a circular outer sheath.

9. The superconducting bundled cable with independent cooling channels according to claim 1, characterized in that: The outer sheath (3) is configured as a rectangular outer sheath.

10. The superconducting bundled cable with independent cooling channels according to claim 9, characterized in that: External cooling channels (301) are symmetrically provided at the corners of the rectangular outer jacket, and the external cooling channels (301) are arranged in parallel with the internal cooling channels (102).

Images