A superconducting magnet coil structure in a dynamic environment

Abstract

The present invention relates to the technical field of dynamic magnet technology, and specifically to a superconducting magnet coil structure in a dynamic environment. A superconducting magnet coil structure in a dynamic environment includes a superconducting coil, a skeleton, an insulating layer, and an oxygen-free copper plate. It is characterized in that: a number of superconducting coil grooves are evenly arranged on the outer edge of the skeleton, and superconducting coils are arranged in the superconducting coil grooves. An insulating layer and an oxygen-free copper plate are arranged between the superconducting coils and the inner walls of the superconducting coil grooves; glass fiber cloth and aluminum strips are respectively arranged outside the superconducting coils; the height of the aluminum strip exceeds the superconducting coil groove by 0.1 - 0.4 mm; an aluminum cover is assembled outside the superconducting coils. Compared with the prior art, a superconducting magnet coil structure in a dynamic environment is provided. A Teflon insulating layer and an oxygen-free copper plate are used between the superconducting coil and the skeleton to reduce frictional heat. At the same time, the oxygen-free copper sheet has a very high thermal conductivity, so that the generated frictional heat can be quickly taken away, reducing the risk of quench of the superconducting coil.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic magnets, and more specifically to a superconducting magnet coil structure in a dynamic environment. Background Art

[0002] A superconducting magnet is an electromagnet made of a type-II superconductor with a relatively high critical transition temperature and an extremely high critical magnetic field at low temperatures. Its main characteristics are the zero electrical resistance resulting in no electrical loss and the strong magnetic field generated by high current-carrying capacity, which has extensive practical value.

[0003] Superconducting magnets have important application cases and great application prospects in the fields of electrical engineering, transportation, medical treatment, military industry, and scientific experiments, and some of them have already achieved practical benefits. For example, currently, magnetic resonance imaging devices using superconducting magnets have become one of the most popular clinical diagnostic devices in hospitals, and thousands of new magnetic resonance imaging devices are installed and used in hospitals around the world every year; in addition, the most active fields of superconducting technology are still high-tech fields such as scientific experiments and scientific instruments. For example, the TEVATRON accelerator at the Fermi National Accelerator Laboratory in the United States and the HERA proton-electron collider at the Deutsches Elektronen-Synchrotron (DESY) in Hamburg, Germany, have successfully used superconducting magnets as their focusing and deflection magnets, and the number of superconducting magnets reaches thousands. Currently, the United States and Europe have started to build larger superconducting accelerators, such as the Superconducting Super Collider (SSC) in the United States. On its 87-km-long ring, tens of thousands of various superconducting magnets will be used, and its scale will be unprecedented. All of the above superconducting magnets are fixedly installed and operate statically in a fixed space. Thus, it can be seen that static superconducting magnets have been very widely and maturely applied in many fields.

[0004] With the development of science and technology and the improvement of production and living needs, scientists have also begun to study dynamic magnets. When a superconducting magnet is charged and operating, it moves in space and bears various impacts generated by the movement. It is mainly applied in the fields of transportation, military industry, etc. For example, the Yamanashi Maglev Line in Japan uses cryogenic superconducting technology and is expected to complete the first section of the maglev line from Tokyo (Shinagawa) to Osaka in 2027, with a speed of 500 - 600 km / h.

[0005] Currently, all technologies related to static superconducting magnets, from coil design, skeleton structure and materials, magnet suspension, to the cryogenic system and cooling method of the magnet, are very mature. However, simply applying the technology of static magnets to dynamic magnets is completely infeasible, mainly because the coil structure, winding process, magnet suspension method, refrigeration method, and the dynamic and static states are completely different.

[0006] In a static magnet, only the insulation between the skeleton and the coil needs to be considered; in a static magnet under cryogenic excitation, it is only affected by electromagnetic forces, and after reaching equilibrium, the coil operates stably.

[0007] In addition to ensuring good insulation properties for the skeleton and coil of the dynamic magnet, it is also necessary to consider the problem of frictional heat generated between the coil and the skeleton during high-intensity vibration and impact. The magnet structure design needs to start from the perspective of reducing frictional heat. However, since some frictional heat is inevitable, we still need to consider how to remove the frictional heat.

[0008] After the dynamic magnet is excited, it needs to be used in a high-intensity vibration and impact environment. At the same time, affected by electromagnetic force, external excitation and eddy current, it is very difficult to achieve balance. If the structure of the static magnet is adopted, the magnet is very likely to quench and the operation is extremely unstable.

[0009] The present invention mainly studies from the perspective of the structure and processing technology of the coil to improve the operation stability of the dynamic magnet under high-intensity vibration and impact. Summary of the Invention

[0010] In order to overcome the deficiencies of the prior art, the present invention provides a superconducting magnet coil structure in a dynamic environment. Teflon and oxygen-free copper plates are used between the superconducting coil and the skeleton, which not only has an insulating effect but also effectively reduces frictional heat. At the same time, the oxygen-free copper plate has a very high heat conduction efficiency, so that the generated frictional heat can be quickly taken away, reducing the risk of quenching of the superconducting coil.

[0011] To achieve the above object, a superconducting magnet coil structure in a dynamic environment is designed, including a superconducting coil, a skeleton, an insulating layer, and an oxygen-free copper plate. It is characterized in that: a number of superconducting coil grooves are evenly arranged on the outer edge of the skeleton, and superconducting coils are arranged in the superconducting coil grooves. An insulating layer and an oxygen-free copper plate are arranged between the superconducting coil and the inner wall of the superconducting coil groove; glass cloth and aluminum tape are respectively arranged outside the superconducting coil; the height of the aluminum tape exceeds the superconducting coil groove by 0.1-0.4 mm; an aluminum cover is assembled outside the superconducting coil.

[0012] The insulating layer is a Teflon insulating layer, and an oxygen-free copper plate is arranged between the insulating layer on the inner side wall of the superconducting coil groove and the superconducting coil; the insulating layer and the oxygen-free copper plate are adhesively bonded, and the smooth surface of the insulating layer faces the superconducting coil groove.

[0013] The Teflon insulating layer is a Teflon tape.

[0014] The insulating layer and the oxygen-free copper plate are adhesively bonded

[0015] The thickness of the insulating layer is 0.05-0.15 m.

[0016] The thickness of the oxygen-free copper plate is 0.1-0.3 mm.

[0017] The glass fiber cloth is wound circumferentially on the outer side of the superconducting coil, and the aluminum strip is wound circumferentially on the outer side of the glass fiber cloth, and the thickness of the aluminum strip is higher than the skeleton end plate at the upper end of the groove of the superconducting coil.

[0018] The aluminum cover is sleeved on the outer surface of the superconducting coil, and the aluminum cover is connected to the skeleton by screws.

[0019] The machining accuracy of the interior and side surfaces of the skeleton is 1.6.

[0020] The preparation process of the superconducting coil structure of the superconducting magnet is as follows:

[0021] (1) Wipe the superconducting coil groove of the skeleton clean with alcohol or acetone;

[0022] (2) Paste a Teflon insulating layer on the bottom of the superconducting coil groove. First, bond the Teflon insulating layer on the side surface to the oxygen-free copper plate, and then turn the bonded material with the Teflon surface facing the side surface of the superconducting coil groove, and pre-fix it with tape;

[0023] (3) Wind the superconducting coil in the superconducting coil groove pasted with the Teflon insulating layer and the oxygen-free copper plate, and adopt the wet winding process, that is, brush resin while winding the wire;

[0024] (4) After the superconducting coil is wound, wind 4 to 6 layers of glass fiber cloth, and then wind the aluminum strip on the outer side of the glass fiber cloth;

[0025] (5) After the aluminum strip is wound, ensure that the height of the aluminum strip is slightly higher than the height of the skeleton end plate, and then insert the aluminum cover onto the skeleton and fix it with screws.

[0026] Compared with the prior art, the present invention provides a superconducting magnet coil structure in a dynamic environment. A Teflon insulating layer and an oxygen-free copper plate are used between the superconducting coil and the skeleton to reduce frictional heat. At the same time, the oxygen-free copper plate has a very high thermal conductivity, so that the generated frictional heat can be quickly taken away, reducing the risk of quench of the superconducting coil.

[0027] After the superconducting coil is wound, wind the glass fiber cloth and the aluminum strip to ensure that the overall structure is slightly higher than the skeleton flange, insert the aluminum cover with a flow channel into it, and fix it on the skeleton with screws, so that the superconducting coil is subjected to a certain pre-tightening force. At low temperature, the aluminum cover shrinks to further fasten the superconducting coil, ensuring that the superconducting coil will not produce small movements under vibration and impact in the state of low-temperature excitation, reducing the risk of quench of the superconducting coil.

[0028] Flow channels are evenly distributed along the circumferential direction of the inner ring of the aluminum cover, which not only reduces the contact area between the aluminum cover and the superconducting coil, but also increases the contact area between the superconducting coil and liquid helium, further improving the stability of the superconducting coil in a vibration and impact environment. Brief Description of the Drawings

[0029] Figure 1 This is a schematic structural diagram of the present invention.

[0030] Figure 2 This is the front view of the present invention.

[0031] Figure 3 This is a structural sectional view of the present invention.

[0032] Figure 4 is Figure 3 a partially enlarged schematic diagram of...

[0033] See Figures 1 to 4 , where 1 is the skeleton, 2 is the screw, 3 is the aluminum cover, 4 is the aluminum strip, 5 is the fiberglass cloth, 6 is the superconducting coil, 7 is the insulating layer, 8 is the oxygen-free copper plate, and 9 is the coil groove. Specific embodiments

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] As Figures 1 to 4 shown, a plurality of coil grooves 9 are evenly arranged on the outer edge of the skeleton 1, and a superconducting coil 6 is arranged in the coil groove 9. An insulating layer 7 and an oxygen-free copper plate 8 are arranged between the superconducting coil 6 and the inner wall of the coil groove 9; a fiberglass cloth 5 and an aluminum strip 4 are respectively arranged outside the superconducting coil 6; the height of the aluminum strip 4 exceeds the coil groove 9 by 0.2 mm; an aluminum cover 3 is assembled outside the superconducting coil 6.

[0036] The insulating layer 7 is a Teflon insulating layer, and an oxygen-free copper plate 8 is arranged between the insulating layer 7 on the inner side wall of the coil groove 9 and the superconducting coil 6; the insulating layer 7 and the oxygen-free copper plate 8 are adhesively bonded, and the smooth surface of the insulating layer 7 faces the coil groove 9.

[0037] The Teflon insulating layer is a Teflon tape.

[0038] The insulating layer 7 is adhesively bonded to the oxygen-free copper plate 8.

[0039] The thickness of the insulating layer 7 is 0.05 - 0.15 m.

[0040] The thickness of the oxygen-free copper plate 8 is 0.1 - 0.3 mm.

[0041] The fiberglass cloth 5 is wound circumferentially outside the superconducting coil 6, and the aluminum strip 4 is wound circumferentially outside the fiberglass cloth 5, and the thickness of the aluminum strip 4 is higher than the skeleton end plate at the upper end of the coil groove 9.

[0042] The aluminum cover 3 is sleeved on the outer surface of the superconducting coil 6, and the aluminum cover 3 is connected to the skeleton 1 by screws 2.

[0043] The machining accuracy of the interior and side surfaces of the skeleton 1 is 1.6.

[0044] The preparation process of the superconducting magnet coil structure is as follows:

[0045] (1) Wipe the coil grooves of the skeleton clean with alcohol or acetone;

[0046] (2) Stick a Teflon insulating layer on the bottom of the coil groove. For the Teflon insulating layer on the side, first adhesively bond it to the oxygen-free copper plate, and then place the bonded material with the Teflon side facing the side of the coil groove, and pre-fix it with tape;

[0047] (3) Wind the coil in the coil groove with the Teflon insulating layer and oxygen-free copper plate attached. Adopt the wet winding process, that is, brush resin while winding the wire;

[0048] (4) After the coil winding is completed, wind 4 - 6 layers of fiberglass cloth, and then wind aluminum tape on the outside of the fiberglass cloth;

[0049] (5) After the aluminum tape winding is completed, ensure that the height of the aluminum tape is slightly higher than the height of the skeleton end plate, then insert the aluminum cover onto the skeleton, and fix it with screws.

[0050] While ensuring high insulation performance between the superconducting coil 6 and the skeleton 1, the heat exchange efficiency is also improved. A Teflon insulating layer 7 with a thickness of 0.05 - 0.15 m and an oxygen-free copper plate 8 with a thickness of 0.1 - 0.3 mm are used as the transition structure between the superconducting coil 6 and the side of the skeleton 1. The Teflon insulating layer 7 with a very thin wall thickness is used to increase the hardness of the transition structure and reduce frictional heat. At the same time, the oxygen-free copper plate 8 has a very high heat conduction efficiency, so that the generated frictional heat can be quickly taken away, reducing the risk of the coil quenching.

[0051] After the superconducting coil 6 is wound, wind the fiberglass cloth 5 and the aluminum tape 4 to ensure that the overall structure is slightly higher than the skeleton flange. Then, put on the aluminum cover 3 with a flow channel and fix it on the skeleton 1 with screws 2. The superconducting coil 6 is subjected to a certain pre-tightening force. At low temperature, the aluminum cover 3 shrinks to further fasten the superconducting coil 6, ensuring that the superconducting coil 6 will not have small displacements under vibration and impact in the state of low-temperature excitation, reducing the risk of the superconducting coil 6 quenching.

[0052] The inner ring of the aluminum cover 3 is evenly distributed with flow channels along the circumferential direction, that is, at the position of the coil groove 9. The aluminum cover 3 is a ring, and the flow channels are opened inside the ring; the slotting size of the coil groove 9 is such that the circumferential contact and non-contact sizes are close, and the depth is determined according to the electromagnetic force and the thickness of the aluminum ring; this not only reduces the contact area between the aluminum cover 3 and the superconducting coil 6, but also increases the contact area between the superconducting coil 6 and liquid helium, further improving the stability of the coil under vibration and impact environments.

[0053] According to the electromagnetic design of the superconducting coil 6 and the insulation dimensions at the bottom and sides, machine the skeleton 1 of the superconducting coil 6. The interior and sides of the skeleton 1 should have a high machining accuracy (roughness 1.6). Machine the installation step for the aluminum cover 3 on the outer circle of the skeleton 1, and control the machining accuracy of the outer circle of the step within ±0.1 mm.

[0054] Cut the Teflon insulation layer 7 at the bottom of the superconducting coil 6 according to the design parameters of the skeleton 1, and cut the side Teflon insulation layer 7 and the oxygen-free copper plate 8.

[0055] Wipe the coil groove 9 of the skeleton 1 clean with alcohol (or acetone), and stick the Teflon insulation layers 7 at the bottom and sides. For the side Teflon insulation layer 7, first bond the Teflon insulation layer 7 to the oxygen-free copper plate 8, with the Teflon insulation layer 7 facing the side plate of the skeleton 1 to ensure insulation between the oxygen-free copper plate 8 and the skeleton 1.

[0056] The superconducting coil 6 adopts the wet winding process. While winding the wire, brush resin. According to different vibration and shock levels, appropriately add fiberglass cloth 5 between layers to improve the internal strength of the superconducting coil 6.

[0057] After the superconducting coil 6 is wound, wind 4 - 6 layers of fiberglass cloth 5 to protect the superconducting coil 6, and wind a certain number of layers of aluminum strip 4 around the periphery according to the circumferential stress of the superconducting coil 6.

[0058] After the aluminum strip 4 is wound, ensure that the aluminum strip 4 is slightly higher than the end plate of the skeleton 1. Insert the aluminum covers 3 at both ends and fix them with screws 2 to give a certain pre-tightening force to the superconducting coil 6, thus completing the assembly of the magnet coil structure.

Claims

1. A superconducting magnet coil structure in a dynamic environment, comprising a coil, a skeleton, an insulating layer, and an oxygen-free copper plate, characterized in that: A number of coil grooves (9) are evenly distributed on the outer edge of the framework (1). A superconducting coil (6) is arranged in the coil groove (9). An insulating layer (7) and an oxygen-free copper plate (8) are arranged between the superconducting coil (6) and the inner wall of the coil groove (9); a glass fiber cloth (5) and an aluminum strip (4) are respectively arranged outside the superconducting coil (6); the height of the aluminum strip (4) exceeds the coil groove (9) by 0.1 - 0.4 mm; an aluminum cover (3) is assembled outside the superconducting coil (6). The insulating layer (7) is a Teflon insulating layer, and an oxygen-free copper plate (8) is arranged between the insulating layer (7) on the inner side wall of the coil groove (9) and the superconducting coil (6); the insulating layer (7) and the oxygen-free copper plate (8) are adhesively bonded, and the smooth surface of the insulating layer (7) faces the coil groove (9). The glass fiber cloth (5) is wound around the outside of the superconducting coil (6) circumferentially, and the aluminum strip (4) is wound around the outside of the glass fiber cloth (5) circumferentially, and the thickness of the aluminum strip (4) is higher than the framework end plate at the upper end of the coil groove (9). The preparation process of the superconducting magnet coil structure is as follows: (1) Wipe the coil grooves of the framework clean with alcohol or acetone; (2) Stick a Teflon insulating layer on the bottom of the coil groove. First, adhesively bond the Teflon insulating layer on the side with the oxygen-free copper plate, and then turn the Teflon surface of the bonded material towards the side of the coil groove and pre-fix it with tape; (3) Wind the coil in the coil groove with the Teflon insulating layer and the oxygen-free copper plate pasted, using the wet winding process, that is, brush resin while winding the wire; (4) After the coil winding is completed, wind 4 - 6 layers of glass fiber cloth, and then wind the aluminum strip outside the glass fiber cloth; (5) After the aluminum strip winding is completed, ensure that the height of the aluminum strip is slightly higher than the height of the framework end plate, and then insert the aluminum cover onto the framework and fix it with screws.

2. The superconducting magnet coil structure in a dynamic environment according to claim 1, wherein: The Teflon insulating layer is a Teflon tape.

3. A superconducting magnet coil structure in a dynamic environment according to claim 1, characterized in that: The insulating layer (7) is adhesively bonded to the oxygen-free copper plate (8).

4. A superconducting magnet coil structure in a dynamic environment according to claim 1, characterized in that: The thickness of the insulating layer (7) is 0.05 - 0.15 m.

5. A superconducting magnet coil structure in a dynamic environment according to claim 1 or 3, characterized in that: The thickness of the oxygen-free copper plate (8) is 0.1 - 0.3 mm.

6. The superconducting magnet coil structure in a dynamic environment according to claim 1, wherein: The aluminum cover (3) is sleeved on the outer surface of the superconducting coil (6), and the aluminum cover (3) is connected to the framework (1) with screws (2).

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