High-thermal-conductivity superconducting coil with airflow guide channel

Abstract

The invention relates to the technical field of superconducting magnets, in particular to a high-thermal-conductivity superconducting coil with an airflow guide channel, which comprises a base body, a conductor and a drainage mechanism, the conductor is connected to the interior of the base body, a guide channel is formed in the base body in the length direction, the drainage mechanism comprises a driving structure and a reciprocating drainage structure, the driving structure is installed on the base body, the reciprocating drainage structure is arranged in the guide channel, and the driving structure is used for driving the reciprocating drainage structure to move in the length direction of the guide channel; by arranging the airflow guide channel and the drainage mechanism, it can be ensured that hot airflow can rapidly flow in the length direction of the conductor, the heat dissipation efficiency is improved, then the temperature of the coil is effectively managed and controlled, local overheating is prevented, the stability of the superconducting state is ensured, dependence on an external cooling medium is reduced, and the service life of the coil is prolonged. And through efficient heat dissipation and cooling design, the energy consumption of the system is reduced, the operation cost is reduced, and the economical efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting magnets, and in particular to a high thermal conductivity superconducting coil with an airflow guiding channel. Background Art

[0002] A superconducting coil is an electromagnetic coil made of superconducting materials that can conduct current without resistance at low temperatures, and has very high current carrying capacity and strong magnetic field generation capabilities. Superconducting coils can carry higher current densities than conventional wires and are suitable for applications that require large currents. Superconducting materials have zero resistance when in the superconducting state (i.e., below their critical temperature), so the current flowing in the superconducting coil will not generate Joule heat loss. However, in actual operation, due to AC losses, quenching, dynamic resistance losses, thermal stability issues, and efficiency issues of the cooling system, superconducting coils may generate heat and usually require cooling using cryogenic coolants such as liquid nitrogen or liquid helium.

[0003] Traditional superconducting coils require a complex cooling system to maintain their superconducting state, which increases the volume, weight and energy consumption of the system. Therefore, how to simplify the cooling process and improve efficiency has become an important research direction.

[0004] How to design the airflow guiding channel inside the matrix to ensure that the airflow can be evenly distributed around the superconducting coil to improve the heat dissipation efficiency; how to effectively manage and control the temperature of the coil to prevent local overheating and ensure the stability of the superconducting state; while taking into account the characteristics of the superconducting material; ensuring that the design of the airflow guiding channel will not affect the mechanical strength and stability of the coil to avoid deformation or damage under high current and magnetic field; optimizing the channel structure to reduce the flow resistance when the airflow passes through, ensuring that the airflow can circulate effectively without affecting the performance of the coil; ensuring that the system maintains good performance under different working environment conditions (such as temperature and pressure changes) are all technical problems that need to be urgently solved in the existing technology. Summary of the invention

[0005] The present invention provides a high thermal conductivity superconducting coil with an airflow guiding channel, which is used to solve the problems of poor stability, over-reliance on external refrigeration medium and high energy consumption of traditional superconducting coils.

[0006] The present invention provides a high thermal conductivity superconducting coil with an airflow guiding channel, comprising: substrate, conductor and drainage mechanism; The conductor is connected to the inside of the substrate, and a guide channel is opened inside the substrate along the length direction. The drainage mechanism includes a driving structure and a reciprocating drainage structure. The driving structure is installed on the substrate, and the reciprocating drainage structure is arranged inside the guide channel. The driving structure is used to drive the reciprocating drainage structure to move along the length direction of the guide channel.

[0007] In some of the embodiments, the conductor is formed by laminating a plurality of tape layers, the outside of the plurality of tape layers is coated with a wrapping material, and the space between two adjacent tape layers is filled with the wrapping material.

[0008] In some of the embodiments, the surrounding material is a high thermal conductivity insulating composite material.

[0009] In some of the embodiments, the material of the tape is a high temperature superconducting material.

[0010] In some of the embodiments, an arc-shaped groove is provided on the base, and the driving structure is connected to the reciprocating drainage structure by a wire rope passing through the arc-shaped groove.

[0011] In some of the embodiments, heat dissipation holes and cold air intake holes are provided on the base.

[0012] In some of the embodiments, a guide plate is installed on the inner wall of the base.

[0013] In some of the embodiments, the drainage direction of the drainage plate is toward the location of the heat dissipation hole.

[0014] In some of the embodiments, a drainage surface is provided on the inner wall of the substrate.

[0015] In some of the embodiments, the reciprocating flow guiding structure is disposed directly below the conductor.

[0016] The beneficial effects of the present invention are as follows: By opening an airflow guide channel and setting a drainage mechanism, it can be ensured that the hot air flow can flow quickly along the length direction of the conductor, improve the heat dissipation efficiency, and then effectively manage and control the temperature of the coil, prevent local overheating, and ensure the stability of the superconducting state. By selecting a suitable thermal conductive material, the thermal conductivity is further improved. At the same time, the characteristics of the superconducting material are taken into consideration to ensure that the opening of the airflow guide channel will not affect the mechanical strength and stability of the coil, and avoid deformation or damage under high current and magnetic field. The optimized guide channel structure reduces the flow resistance when the airflow passes through, ensuring that the airflow can circulate effectively without affecting the performance of the coil, so that the system can still maintain good performance under different working environment conditions (such as temperature and pressure changes). Through the self-cooling function, the dependence on external cooling medium is reduced, and faster and more effective temperature control is achieved; the optimized structural design makes the superconducting coil more compact and lightweight, which is convenient for installation and application in various occasions; through efficient heat dissipation and cooling design, the energy consumption of the system is reduced, the operating cost is reduced, and the economy is improved; it can quickly respond to temperature changes, improve the ability to maintain superconducting characteristics, and adapt to the needs under transient conditions; using fewer external components, reducing maintenance complexity, and improving the reliability and service life of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of some specific embodiments of a high thermal conductivity superconducting coil with an airflow guiding channel of the present invention; Figure 2 It is a schematic structural diagram of some specific embodiments of a driving structure in a high thermal conductivity superconducting coil with an airflow guiding channel of the present invention; Figure 3 yes Figure 2 A schematic diagram of the structure of a high thermal conductivity superconducting coil with an airflow guiding channel marked with A shown; Figure 4 yes Figure 2 Some other structural schematic diagrams of a driving structure in a high thermal conductivity superconducting coil with an airflow guiding channel shown; Figure 5 It is a structural schematic diagram of the side surface of a substrate in a high thermal conductivity superconducting coil with an airflow guiding channel of the present invention; Figure 6 yes Figure 5 A schematic diagram of the structure marked at B in a high thermal conductivity superconducting coil with an airflow guiding channel is shown.

[0018] In the attached drawings, 1, substrate; 2, strip; 3, wrapping material; 4, cold air inlet hole; 5, heat dissipation hole; 6, base A; 7, motor; 8, first coil; 9, first bevel gear; 10, second bevel gear; 11, base B; 12, second coil; 13, rope C; 14, arc groove; 15, rope B; 16, drainage sheet; 17, drainage plate; 18, rope A; 19, rope guide ring. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] At present, superconducting coils are electromagnetic coils made of superconducting materials. Their characteristics are that they can conduct current without resistance at low temperatures, and have very high current carrying capacity and strong magnetic field generation capabilities. Superconducting coils can carry higher current densities than conventional wires and are suitable for applications that require large currents. Since the resistance is zero, superconducting coils do not generate heat during operation, which improves energy efficiency. In order to maintain the superconducting state, low-temperature coolants such as liquid nitrogen or liquid helium are usually required. Ordinary superconducting coils usually rely on external cooling media (such as liquid nitrogen or liquid helium), have low cooling efficiency, and require a continuous cooling system; the energy consumption required to maintain cooling is large, which increases the overall operating cost; the external cooling system requires regular maintenance and inspection, which increases the complexity and cost of management.

[0021] The present invention aims to develop a high thermal conductivity superconducting coil with an airflow guiding channel, so as to solve the problem in the prior art of how to design the airflow guiding channel inside the superconducting coil to optimize the airflow path so that it effectively covers the surface of the superconducting coil and maximizes the cooling effect.

[0022] To solve the above problems, refer to Figure 1 , the present invention provides a high thermal conductivity superconducting coil with an airflow guiding channel, comprising a substrate 1, a conductor and a drainage mechanism; The conductor is connected to the upper side of the inner part of the substrate, and a guide channel is provided inside the substrate along the length direction. The drainage mechanism includes a driving structure and a reciprocating drainage structure. The driving structure is installed on the substrate, and the reciprocating drainage structure is arranged inside the guide channel. The driving structure is used to drive the reciprocating drainage structure to move along the length direction of the guide channel, driving the hot air to flow inside the substrate 1, and quickly cooling the conductor. Liquid curing medium epoxy resin is injected into the substrate 1. The material is liquid after being modulated or heated and melted. In order to further enable the curing medium to be more fully filled inside the substrate 1, the present invention will also pressurize the curing medium. Under a higher injection pressure, all spaces inside the substrate 1 are filled with the curing medium. The shell of the substrate 1 is made of metal material, and its cross-sectional shape is circular, which fits the cross-sectional shape of the internal airflow guide channel, and the cross-sectional size of the substrate 1 is larger than the cross-sectional size of the conductor. The substrate 1 is provided with a cavity for accommodating the conductor inside it, and the shape and size of the cavity match the shape and size of the conductor, so when the conductor is assembled inside the cavity, the conductor and the substrate 1 can be tightly connected.

[0023] In the specific scheme adopted in this embodiment, an assembly groove is provided on the surface of the substrate 1 connected to the conductor, the assembly groove is connected to the cavity, and the width of the assembly groove is slightly smaller than the width of the conductor. During assembly, the assembly groove is first expanded to the same width as the conductor, and then the conductor is pressed into the cavity, and finally the substrate 1 is squeezed to restore the assembly groove to a normal size. Since the width of the assembly groove at a normal size is smaller than the width of the conductor, the conductor can be tightly confined in the cavity and will not slide out of the cavity.

[0024] Preferably, see Attachment Figure 1The conductor is formed by stacking multiple layers of strips 2, the outer surface of the multiple layers of strips is coated with a wrapping material 3, and the space between two adjacent layers of strips 2 is filled with a wrapping material 3. The wrapping material between the conductor and the substrate 1 can effectively protect the conductor to avoid abnormal wear of the conductor, and also has excellent thermal conductivity and insulation properties. The wrapping material between adjacent strips 2 can further protect the strips to avoid damage or performance degradation due to friction between adjacent strips 2, so that it has excellent electrical insulation and thermal conductivity and sufficient mechanical strength, and also performs well in low temperature resistance. After the conductor is installed, the conductor is pressed. Through the pressing process, as many conductors as possible can be assembled in the same size cavity, thereby improving the filling rate of the conductor.

[0025] Preferably, see Attachment Figure 1 , the wrapping material 3 is a high thermal conductivity insulating composite material, the insulating wrapping material is a graphene / carbon nanotube composite material, and similar composite materials can also be made of alumina / epoxy resin composite materials, boron nitride / epoxy resin composite materials, aluminum nitride / carbon nanotube composite materials, etc.; the high thermal conductivity insulating composite material adopts a graphene / carbon nanotube composite material, which has good electrical insulation properties to prevent short circuits and improve safety. Due to its excellent thermal conductivity, it can help control the temperature of the coil. It has sufficient mechanical strength to maintain the structural stability of the coil. Since superconducting coils usually work in low temperature environments, the graphene / carbon nanotube composite material can withstand low temperatures without losing its electrical properties. In low temperature environments, the thermal expansion coefficient of carbon nanotubes is low, which helps to maintain the structural stability of the material; since the wrapping material 3 also uses a high thermal conductivity composite material, there is no need to introduce helium into the air flow channel to increase costs.

[0026] Preferably, see Attachment Figure 1 The material of the strip 2 is a high-temperature superconducting material. In the present invention, REBCO (rare earth barium copper oxide) is used. The REBCO material has a high critical temperature and can withstand a high current density. When used in a superconducting coil, the loss is very small in the superconducting state, which improves the overall efficiency of the system. It can be prepared in a variety of ways. The conductor formed by stacking multiple layers of strips 2 is shaped after winding, which can greatly reduce the tensile and compressive stresses generated by the bending action of the traditional CORC cable when winding the coil, and achieve a large current carrying capacity while reducing the mechanical stress of the strip; the strip can slide during winding, and even if the total thickness of the conductor is large, it will not accumulate a large stress, so that the winding of a small-sized solenoid can be realized. The width, thickness and length of each layer of strips 2 can be the same or different. When the width of each layer of strips 2 is the same, the conductor cross-section is rectangular, and when the width is different, the conductor cross-section is other shapes. Therefore, the width of each layer of strips 2 can be determined according to the cross-sectional shape requirements of the conductor.

[0027] Preferably, see Attachment Figure 1 , attached Figure 2 , attached Figure 3 , attached Figure 4 , Attachment Figure 5 and attached Figure 6 , an arc groove 14 is provided on the base, and the driving structure is connected to the reciprocating drainage structure through a wire rope passing through the arc groove 14; Specifically, the driving structure includes a base A6, a motor 7, a first coil 8, a first bevel gear 9, a second bevel gear 10, a base B11, a second coil 12 and a rope A18; wherein the base A6 is fixedly mounted on one end of the base 1, the base B11 is fixedly mounted on the other end of the one end of the base 1, the motor 7 is fixedly mounted on the base A6, the output end of the motor 7 is fixedly connected to the first bevel gear 9, the first coil 8 is rotatably connected to the base A6, and the second bevel gear 10 is fixedly mounted at the center of the upper surface of the first coil 8, the first bevel gear 9 is meshed with the second bevel gear 10, the second coil 12 is mounted on the base B11, the rope A18 is wound around the first coil 8 and the second coil 12, and one end of the rope C13 is connected to the rope A18, and the other end of the rope C13 is connected to the reciprocating drainage structure; Specifically, the reciprocating drainage structure is a drainage plate 16 with an arc-shaped cross-section, two arc-shaped grooves 14 are provided on the substrate 1, and two wire ropes B15 are also provided. One end of the two wire ropes B15 is connected to the wire rope C13, and the other end passes through different arc-shaped grooves 14 to be connected to the drainage plate 16. In practical applications, the superconducting coil needs to be wound, so in the technical solution of the present invention, multiple groups of wire rope guide rings 19 are also installed on the substrate 1. The wire rope A18 passes through the multiple groups of wire rope guide rings 19 in sequence, so that after the superconducting coil is wound, the wire rope A18 is still distributed along the length direction of the substrate 1. In specific applications, it is only necessary to start the motor 7 to drive the first coil 8 to rotate, and the first coil 8 drives the second coil 12 to rotate through the wire rope A18, so that the wire rope C13 makes a reciprocating motion along the length direction of the substrate 1, and the wire rope C drives the drainage plate 16 inside the substrate 1 to make a reciprocating motion to achieve the drainage effect.

[0028] Preferably, see Attachment Figure 5 The substrate is provided with heat dissipation holes 5 and cold air inlet holes 4. Due to the "chimney effect", hot air will flow upward. Therefore, in the technical solution of the present invention, the heat dissipation holes 5 are opened on the side of the substrate 1, and a plurality of heat dissipation holes 5 are opened. The plurality of heat dissipation holes 5 are distributed along the length direction of the substrate 1, and the cold air inlet holes 4 are opened at the bottom of the substrate 1 and distributed along the length direction of the substrate 1.

[0029] Preferably, see Attachment Figure 1 The inner wall of the substrate is installed with guide plates 17, and the guide plates 17 are distributed circumferentially along the inner wall of the substrate 1. At the same time, multiple groups of the circumferentially distributed guide plates 17 are also arranged along the length direction of the substrate 1.

[0030] Preferably, the drainage direction of the drainage plate is toward the location of the heat dissipation hole, so that the hot air can be quickly discharged from the heat dissipation hole 5.

[0031] Preferably, the inner wall of the substrate is provided with a drainage surface. The drainage surface in the technical solution of the present invention is a saddle surface. The shape of the saddle surface can effectively guide the airflow and make it evenly distributed inside the superconducting coil, reducing dead zones and airflow retention. This shape can increase the contact area between the airflow and the superconducting material, thereby improving the heat exchange efficiency and promoting the cooling effect. It can also better adapt to the geometric shape of the superconducting coil and optimize space utilization. Due to the change in the curvature of the saddle shape, the velocity and pressure distribution of the airflow can be reasonably adjusted, which helps to maintain a stable cooling environment.

[0032] Preferably, the reciprocating drainage structure is arranged directly below the conductor, so that the drainage plate 16 can drain the hot air in time.

[0033] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high thermal conductivity superconducting coil with an airflow guiding channel, characterized in that: include: substrate, conductor and drainage mechanism; The conductor is connected to the inside of the substrate, and a guide channel is opened inside the substrate along the length direction. The drainage mechanism includes a driving structure and a reciprocating drainage structure. The driving structure is installed on the substrate, and the reciprocating drainage structure is arranged inside the guide channel. The driving structure is used to drive the reciprocating drainage structure to move along the length direction of the guide channel.

2. The high thermal conductivity superconducting coil with an airflow guiding channel according to claim 1, characterized in that: The conductor is formed by stacking multiple layers of tapes, the outer surfaces of the multiple layers of tapes are coated with a wrapping material, and the space between two adjacent layers of tapes is filled with the wrapping material.

3. The high thermal conductivity superconducting coil with airflow guiding channel according to claim 2, characterized in that: The wrapping material is a high thermal conductivity insulation composite material.

4. The high thermal conductivity superconducting coil with an airflow guiding channel according to claim 1, characterized in that: The material of the strip is a high temperature superconducting material.

5. The high thermal conductivity superconducting coil with airflow guiding channel according to claim 1, characterized in that: An arc groove is provided on the base, and the driving structure is connected with the reciprocating drainage structure by a wire rope passing through the arc groove.

6. The high thermal conductivity superconducting coil with airflow guiding channel according to claim 1, characterized in that: The base is provided with heat dissipation holes and cold air intake holes.

7. The high thermal conductivity superconducting coil with airflow guiding channel according to claim 6, characterized in that: A guide plate is installed on the inner wall of the base.

8. The high thermal conductivity superconducting coil with airflow guiding channel according to claim 7, characterized in that: The drainage direction of the drainage plate is toward the location of the heat dissipation hole.

9. The high thermal conductivity superconducting coil with airflow guiding channel according to claim 1, characterized in that: The inner wall of the base body is provided with a drainage surface.

10. The high thermal conductivity superconducting coil with airflow guiding channel according to claim 1, characterized in that: The reciprocating drainage structure is arranged directly below the conductor.

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