Water-cooling pulse high-intensity magnetic field coil

Abstract

The invention discloses a water-cooling pulsed high-intensity magnetic field coil, and belongs to the technical field of pulsed high-intensity magnetic fields. The coil adopts a laminated structure, each laminated sheet is provided with an opening and a boss, and a spiral structure is formed through electrical connection of the bosses. Each lamination is divided into a through-flow part, a water cooling part and a fixed part; the through-flow part is made of red copper, the water cooling part and the fixing part are made of stainless steel, and an integrated copper-steel composite structure is formed through welding. The water-cooling part is provided with water-cooling grooves welded and sealed by a cover plate; and the water-cooling grooves of the laminations are connected in series through water inlet and outlet holes to form a cooling flow channel. The fixing part is provided with a semicircular fixing hole used for limiting and flow guiding. And an insulating sheet is arranged between the adjacent laminations. The coil is pressed tightly through the upper and lower pressing plates and an insulated fixing stud. Through lamination partitioning and copper-steel compounding, the high-strength and efficient water-cooling capacity is achieved, and the problems of insufficient strength and cooling of the pulse high-intensity magnetic field coil under repetition frequency work are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pulsed high magnetic field, and particularly relates to a water-cooled pulsed high magnetic field coil. BACKGROUND

[0002] As a key means of material research, high magnetic field is widely used in solid physics, semiconductor, superconductor characteristics research, and biology, physical chemistry, particle physics and other fields. The coils in the current pulsed high magnetic field field mainly include water-cooled coils, superconducting coils and hybrid coils. Among them, the superconducting coil is difficult to adapt to the application requirements of pulsed high magnetic field due to the low critical magnetic field strength of superconducting material, and the water-cooled coil becomes the mainstream choice in this field. The traditional water-cooled coil is mainly based on Bitter disc structure design. By setting notches and through holes on the disc, the adjacent coil layers are connected in series through the current path after being isolated by insulating materials, and the coil is cooled by deionized cooling water flowing through the through hole. Such coil is usually directly powered by the power grid. Some pulsed high magnetic field coils use liquid nitrogen cooling scheme, which immerses the magnet in a dewar container and uses 77K low-temperature liquid nitrogen to take away the heat generated in the discharge process.

[0003] However, the existing water-cooled pulsed high magnetic field coil still has significant technical limitations in the heavy frequency working scene: the cooling channel of the traditional Bitter disc type water-cooled coil is dispersed, and the cooling efficiency is limited. If the deionized cooling water is contaminated during the cooling process, it is easy to cause the risk of surface discharge of the coil in the 5~20kV high voltage pulse working environment. Although the liquid nitrogen cooling scheme can realize the cooling of the magnet, the overall design of the magnet is complex, and the manufacturing cost of the coil is high, which is difficult to meet the economic and convenience requirements in actual application. At the same time, both schemes do not effectively balance the mechanical strength and cooling efficiency of the coil, and cannot adapt to the dual requirements of structural stability and continuous heat dissipation in heavy frequency working. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a water-cooled pulsed high magnetic field coil to solve the technical problems of insufficient mechanical strength and low cooling efficiency of the pulsed high magnetic field coil in the heavy frequency working scene, the risk of high voltage surface discharge of the traditional water-cooled scheme, and the complex design and high cost of the liquid nitrogen cooling scheme.

[0005] The technical scheme adopted by the present application is as follows: A water-cooled pulsed high magnetic field coil, comprising an upper pressing plate, a plurality of laminations and a lower pressing plate, the plurality of laminations are stacked between the upper pressing plate and the lower pressing plate, each lamination has an opening and a boss, the boss is electrically connected with the adjacent lamination, thereby forming a spiral structure; Each lamination comprises a through-flow part, a water-cooled part and a fixed part; The through-flow part is made of red copper, the water-cooling part and the fixing part are made of stainless steel, and the through-flow part is integrally formed with the water-cooling part and the fixing part through welding; The water-cooling part is provided with a water-cooling groove which is sealed by a water-cooling groove cover plate, and the water-cooling groove cover plate is welded to the water-cooling part; the fixing part is provided with a plurality of semicircular fixing holes for forcing the current to flow to the inner side of the coil; Insulating sheets for turn-to-turn insulation are arranged between adjacent two laminations; Current introduction sheets are arranged between the upper pressing plate and the coil, and current extraction sheets are arranged between the lower pressing plate and the coil; The upper pressing plate and the lower pressing plate fix the coil together through fixing studs and fixing nuts.

[0006] Preferably, the water-cooling groove is provided with a lamination water inlet hole at one end and a lamination water outlet hole at the other end, the lamination water inlet hole is communicated with the lamination water outlet hole of the previous lamination, and the lamination water outlet hole is communicated with the lamination water inlet hole of the next lamination.

[0007] Preferably, a sealing ring groove is arranged around the lamination water inlet hole for placing a sealing ring.

[0008] Preferably, the sealing ring is a red copper or pure aluminum sealing ring.

[0009] Preferably, the fixing part includes a plurality of semicircular fixing holes which are uniformly distributed on the outermost side of the coil.

[0010] Preferably, the fixing studs pass through the semicircular fixing holes and are insulated from each lamination through an insulating sleeve.

[0011] Preferably, the water-cooling groove cover plate is connected to the water-cooling part through a water-cooling groove and a water-cooling groove cover plate weld.

[0012] Preferably, the through-flow part is connected to the water-cooling part through a through-flow part and a water-cooling part weld.

[0013] Preferably, the current introduction sheet is provided with a coil water inlet for cooling water inflow, and the current extraction sheet is provided with a coil water outlet for cooling water outflow.

[0014] Preferably, the opening and the boss of each lamination each account for 1 / 8 of the circumference of the lamination.

[0015] Compared with the prior art, the present application has at least the following beneficial effects: A water-cooled pulsed high magnetic field coil realizes precise matching of function and material through lamination partition design and copper-steel composite structure. The copper through-flow part guarantees excellent electrical conductivity to meet the demand of large current transmission in pulsed high magnetic field; the stainless steel water-cooling and fixing part gives the coil high mechanical strength to resist electromagnetic force impact in heavy frequency operation. The insulation sheet between laminations ensures inter-turn insulation and avoids short circuit risk, and the fastening structure of upper and lower pressing plates and fixing studs further improves the overall stability. At the same time, the sealing design of the water-cooling tank and cover provides a basis for forced cooling, and the current introduction / exit sheet ensures the orderly entry and exit of current. The overall scheme coordinates from multiple dimensions of structure, material, insulation and cooling, fundamentally solves the core problem that traditional coils cannot balance strength and cooling, and lays a complete technical foundation for subsequent optimization.

[0016] Further, by defining the series relationship between the lamination water inlet hole and the water outlet hole, the dispersed single lamination water-cooling tank is integrated into a through-type cooling flow channel. This series design enables cooling water to flow through each lamination in an orderly manner, with no cooling dead angle, greatly improving heat exchange efficiency and ensuring that the temperature of each area of the coil is uniform and stable within a safe range during heavy frequency operation. Compared with traditional dispersed cooling, the series flow channel has controllable water flow path and stable flow resistance, avoiding overheating problems caused by poor local water flow, while the closed flow channel structure reduces the probability of cooling water pollution and the risk of high-voltage surface discharge, providing reliable cooling protection for the stable operation of the coil, effectively making up for the defects of low cooling efficiency and insufficient safety of traditional water-cooling schemes.

[0017] Further, a sealing ring groove is provided around the lamination water inlet hole to provide installation space for the sealing structure, which is a key design to ensure the sealing performance of the cooling system. The sealing ring groove can accurately position the sealing ring to prevent it from shifting during assembly or operation, ensuring stable sealing effect. In the vibration and pressure change environment of heavy frequency operation, the sealing ring groove can limit the deformation range of the sealing ring to avoid cooling water leakage caused by misalignment of the sealing ring. This design solves the problem of easy leakage at the connection part of the traditional cooling channel, improves the reliability and durability of the cooling system, and provides necessary protection for safe cooling under high-voltage pulsed working conditions, further perfecting the sealing system of the cooling flow channel.

[0018] Further, the sealing ring is made of red copper or pure aluminum, which fully utilizes the excellent plasticity and compatibility of these two metals. Red copper and pure aluminum are easy to deform under pressure, which can tightly fill the micro gaps of the water inlet hole connection surface, forming an efficient seal and effectively preventing cooling water leakage. At the same time, these two materials have good electrochemical compatibility with stainless steel laminations, which can avoid electrochemical corrosion caused by long-term contact and prolong the service life of the sealing structure. Compared with ordinary rubber sealing rings, metal sealing rings are resistant to high temperature and aging, and can adapt to temperature fluctuations during heavy frequency operation, solving the problem of easy failure of traditional sealing rings in high-voltage and high-temperature environments, and significantly improving the stability and durability of the cooling system sealing.

[0019] Furthermore, the semi-circular fixing holes of the fixing part are evenly distributed on the outermost side of the coil, achieving optimization from both mechanical and electromagnetic perspectives. Mechanically, the evenly distributed fixing holes allow the fixing studs to apply a uniform tightening force, firmly securing the laminated assembly and improving the overall structure's resistance to electromagnetic shocks, preventing laminate displacement during repeated-frequency operation. Electromagnetically, the conductivity of the outermost stainless steel fixing part is much lower than that of the inner copper current-carrying part. This difference in material conductivity forces the current to concentrate inwards, enhancing the inner magnetic field strength and improving magnetic field generation efficiency, while simultaneously reducing ohmic losses in the outer structural components. This design balances structural stability and magnetic field performance, solving the problem of the difficulty in coordinating traditional coil fixing and magnetic field optimization.

[0020] Furthermore, by installing an insulating sleeve between the fixing stud and the laminations, the mechanical fastening and electrical insulation are separated. The insulating sleeve effectively blocks the current path between the fixing stud and the laminations, preventing the metal stud from short-circuiting the laminations and ensuring the integrity of the coil's helical current path, thus guaranteeing the normal generation of the pulsed strong magnetic field. Simultaneously, the insulating sleeve does not affect the mechanical fastening function of the stud, allowing the lamination assembly to maintain a stable structure. This design solves the key problem of traditional metal fasteners easily causing coil short circuits, balancing structural stability and electrical reliability, providing crucial protection for the safe and efficient operation of the coil, and improving the overall insulation system.

[0021] Furthermore, it is clarified that the water-cooled tank cover plate and the water-cooling section are connected by welds. Welding creates a dense, high-strength metallurgical bond, ensuring a complete seal of the water-cooled tank and fundamentally eliminating the risk of cooling water leakage. This is particularly suitable for sealing requirements under high-pressure pulse conditions. The welded connection has high structural strength and can withstand temperature changes and vibrations during repeated operation, preventing the cover plate from separating from the water-cooling section. Compared to bolted connections, welding eliminates the need for additional seals, simplifying the structure while improving sealing reliability. This solves the problems of easy leakage and complex structure associated with traditional water-cooled tank sealing methods, providing a solid guarantee for the long-term stable operation of the cooling channels.

[0022] Furthermore, the connection between the flow passage and the water-cooling section via welds not only provides high-strength mechanical fixation, giving the copper flow passage section strong support from the stainless steel water-cooling section and enhancing its overall electromagnetic resistance, but also establishes an efficient heat conduction path. The Joule heat generated by the copper flow passage section during high-frequency operation can be rapidly conducted to the water-cooling section through the weld, and then carried away by the cooling water, significantly improving heat dissipation efficiency and preventing localized overheating. The integrated structure formed by welding reduces thermal resistance, solving the problems of low heat conduction efficiency and insufficient structural strength in traditional splicing methods, achieving synergistic optimization of conductivity, heat dissipation, and structural strength.

[0023] Furthermore, the coil inlet and outlet are respectively located on the current-inlet and current-outlet plates, ensuring that the water flow path is essentially aligned with the current path. Cooling water flows in from the current-inlet end, gradually absorbing heat from each lamination as the current flows, and finally flows out from the current-outlet end. This achieves uniform heat absorption, avoids localized overheating, and optimizes the temperature field distribution. Simultaneously, integrating the inlet and outlet onto the current-inlet / outlet plates simplifies external piping connections, making the system structure more compact and reducing assembly complexity. This design solves the problems of uneven cooling and structural complexity caused by the unreasonable layout of traditional cooling inlets and outlets, improving cooling efficiency and system integration.

[0024] Furthermore, the design specifies that the lamination opening and the boss each occupy 1 / 8 of the circumference. Precise dimensional design ensures perfect alignment between adjacent lamination bosses, achieving reliable electrical connection and guaranteeing a continuous and stable spiral current path. This avoids current loss or localized overheating due to poor connection. The optimized 1 / 8 circumference ratio satisfies the requirement for smooth current transmission while providing ample space for current flow, water cooling, and fixing components of the lamination, ensuring a rational layout of each functional area. This standardized dimensional design improves the precision of lamination processing and assembly, solving the problems of unreliable connections and arbitrary dimensional design in traditional lamination designs, and ensuring coil performance stability and manufacturability.

[0025] In summary, the water-cooled high magnetic field coil of this invention adopts a copper-steel composite structure, which achieves a balance between strength and conductivity through copper-steel composite, series water cooling ensures efficient heat dissipation, insulation design prevents short circuits, and precise dimensions ensure reliable connection. It comprehensively solves the problems of insufficient strength, inefficient cooling, and easy short circuits of traditional coils, and achieves stable and efficient operation at high repetition rates.

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a water-cooled pulsed high magnetic field coil. Figure 2 This is a schematic diagram of the intermediate laminate structure; Figure 3 This is a schematic diagram of the water-cooling tank and its cover plate. Figure 4 A schematic diagram of the water inlet hole and sealing structure for each laminate; Figure 5 Schematic diagram of the current introduction plate structure; Figure 6 This is a schematic diagram of the current lead-out plate structure; Figure 7 This is a schematic diagram of the water-cooled pulsed strong magnetic field current and the direction of water flow.

[0028] The components are as follows: 1. Current inlet plate; 2. Current outlet plate; 3. Intermediate lamination plate; 4. Upper pressure plate; 5. Lower pressure plate; 6. Fixing stud; 7. Fixing nut; 8. Coil inlet; 9. Coil outlet; 10. Insulating sleeve; 11. Insulating sheet; 12. Water cooling tank cover plate; 13. Sealing ring groove; 301. Semi-circular fixing hole; 302. Boss; 303. Lamination plate inlet hole; 304. Flow passage part; 305. Fixing part; 306. Water cooling part; 307. Water cooling tank; 308. Weld between water cooling tank and water cooling tank cover plate; 309. Weld between flow passage part and water cooling part; 121. Lamination plate outlet hole. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "one side," "one end," and "one side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0033] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0034] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0035] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0036] This invention provides a water-cooled pulsed high magnetic field coil. The coil structure adopts a laminated design, with each laminate having an opening of 1 / 8 of its circumference and a boss of 1 / 8 of its circumference. The boss is electrically connected to the next laminate, thus forming a spiral structure. Each intermediate laminate of the coil is divided into three parts: a current-carrying part, a water-cooling part, and a fixing part. The current-carrying part is made of copper. Due to the skin effect of current, the current in the coil is concentrated in the current-carrying part. The water-cooling part and the fixing part are made of stainless steel. The copper and stainless steel are welded together to form a single unit, which increases the strength of the current-carrying part. The water-cooling part provides forced cooling during high-frequency operation of the high magnetic field coil. The fixing part serves two purposes: limiting the coil and forcing the current to flow inwards. This invention's coil adopts a copper-steel composite structure and incorporates a water-cooling groove, resulting in a coil that not only has high strength but also solves the cooling problem under high-frequency operation.

[0037] The present invention discloses a water-cooled pulsed strong magnetic field coil, comprising a current-introducing plate 1, an intermediate stacked plate 3, an insulating plate 11, a current-outlet plate 2, an upper pressure plate 4, a lower pressure plate 5, an insulating sleeve 10, a coil water inlet 8, a coil water outlet 9, a fixing stud 6, and a fixing nut 7.

[0038] Please see Figure 1The coil is positioned between the upper pressure plate 4 and the lower pressure plate 5. A current inlet piece 1 is positioned between the coil and the upper pressure plate 4, and a current outlet piece 2 is positioned between the coil and the lower pressure plate 5. The coil adopts a laminated structure, including multiple intermediate laminates 3. Each intermediate laminate 3 has an opening of 1 / 8 of the circumference and a boss 302 of 1 / 8 of the circumference. The boss 302 is electrically connected to the next intermediate laminate 3, thereby forming a spiral structure. Adjacent intermediate laminates 3 are insulated from each other by an insulating sheet 11. A cooling branch is provided through the coil, and the two ends of the cooling branch are connected to the upper pressure plate 4 and the lower pressure plate 5 respectively.

[0039] Please see Figure 2 Each intermediate lamination 3 is divided into three parts: flow passage 304, water cooling section 306, and fixing section 305.

[0040] The current-carrying part 304 is made of copper. Due to the skin effect of the current, the current in the coil is concentrated on the inner side of the current-carrying part 304, forming a strong magnetic field working area on the inner side of the coil. The sample being processed or treated is located inside the strong magnetic field working area.

[0041] The water-cooled part 306 and the fixed part 305 are made of stainless steel. The flow passage part 304 is welded to the water-cooled part 306 and the fixed part 305 to form an integral part, thereby increasing the strength of the flow passage part 304.

[0042] Please see Figure 3 The water-cooled section 306 has a water-cooling tank 307 for water flow, which removes the heat generated when the coil operates at high frequency. One end of the water-cooling tank 307 has a lamination water inlet 303, which is connected to the lamination water outlet 121 of the previous intermediate lamination 3. The water-cooling tank 307 is sealed by a water-cooling tank cover plate 12. The water-cooling tank cover plate 12 and the intermediate lamination 3 are welded together to form an integral structure. The water-cooling tank cover plate 12 has a lamination water outlet 121, which is connected to the next lamination water inlet 303.

[0043] A weld 309 is provided between the flow passage section 304 and the water cooling section 306, and a weld 308 is provided between the water cooling tank 307 on the water cooling section 306 and the water cooling tank cover plate 12.

[0044] Each stacked plate water inlet hole 303 is surrounded by a sealing ring groove 13 for placing a copper or pure aluminum sealing ring.

[0045] Please see Figure 2 The fixing part 305 includes seven semi-circular fixing holes 301, which are distributed on the outermost side of the coil. On the one hand, they are used to limit the coil, and on the other hand, they can force the current to flow into the inside of the coil.

[0046] Please see Figure 5 and Figure 6 The current inlet plate 1 is provided with a coil inlet 8 for the inflow of cooling water; the current outlet plate 2 is provided with a coil outlet 9 for the outflow of cooling water.

[0047] Please see Figure 7 This shows the relationship between the current and the water flow direction when the water-cooled pulse strong magnetic field coil of the present invention is working, and the water flow direction is the same as the current direction when it is working.

[0048] Example 1 Upper and lower pressure plates: Both are made of 304 stainless steel with a thickness of 15mm-20mm. Their dimensions match the outer diameter of the stacked plates (e.g., a coil with an outer diameter of 500mm corresponds to a pressure plate with an outer diameter of 520mm). The surfaces are polished to reduce contact resistance. A 100mm diameter through hole is opened in the center of the pressure plate to accommodate the sample in the magnetic field working area.

[0049] Stacked wafers: The quantity is set to 20-30 wafers according to the magnetic field requirements, with a single wafer thickness of 5mm-8mm; the opening and the boss each occupy 1 / 8 of the circumference (corresponding to a central angle of 45°), the boss height is 2mm-3mm, and the width is consistent with the width of the current passage (e.g., 30mm). The surface of the boss is silver-plated (plating thickness 5μm-10μm) to reduce contact resistance and ensure reliable electrical connection with adjacent wafers.

[0050] Current-carrying part: Made of T2 copper with a purity of ≥99.95%, the cross-sectional area is designed according to the pulse current (e.g., 800mm² for 50kA current), and the inner arc radius is matched with the working area of ​​the magnetic field (e.g., 80mm). The high conductivity of copper ensures current transmission.

[0051] Both the water-cooling and fixing parts are made of 316L stainless steel. The water-cooling part is 8mm-10mm thick, and the water-cooling groove on it has a rectangular cross-section with dimensions of 10mm (width) × 5mm (depth). The groove length is consistent with the arc length of the water-cooling part (e.g., 300mm). The water-cooling groove cover is made of 1mm-2mm thick 316L stainless steel plate and is welded to the water-cooling part by argon arc welding. The weld width is 2mm-3mm to ensure a leak-free seal. The fixing part has the same thickness as the water-cooling part. There are 7 semi-circular fixing holes with a diameter of 12mm, which are evenly distributed on the outermost side of the coil (the central angle between adjacent holes is approximately 51.4°).

[0052] Insulating sheet: Made of polytetrafluoroethylene, with a thickness of 0.2mm-0.3mm, the size is perfectly matched to the stacked sheets, and the surface is free of bubbles or scratches, ensuring that the inter-turn insulation resistance is ≥100MΩ.

[0053] Current inlet and current outlet plates: Both are made of T2 copper with a thickness of 10mm-12mm. Their area is the same as the contact area of ​​the upper and lower pressure plates. The edges of the inlet and outlet plates are rounded (rounded corner radius of 5mm) to avoid electric field concentration.

[0054] Fixed studs and fixed nuts: The studs are made of M12 304 stainless steel, and the length is designed according to the total thickness of the laminate (e.g., 150mm stud length for 20 laminates). The nuts are matching hexagonal nuts. Spring washers (material 65Mn) are installed at the contact points between the studs and the pressure plate to prevent the nuts from loosening due to vibration.

[0055] Welding process: The flow passage part is brazed with the water cooling part and the fixed part (the brazing filler metal is Cu-P alloy with a melting point of 640℃-650℃). The welding temperature is controlled at 680℃-700℃ and the holding time is 5min-8min to ensure the welding strength is ≥200MPa. The water cooling tank cover plate is argon arc welded with the water cooling part. The welding current is 120A-150A and the welding speed is 5mm / s-8mm / s. After welding, a water pressure test is performed (test pressure 1.5MPa, pressure holding for 30min without leakage).

[0056] Multiple laminations are electrically connected to adjacent laminations via bosses to form a spiral structure. Current flows in from the current inlet plate, passes through the current-carrying sections of each lamination in sequence, and finally flows out from the current outlet plate, generating an axial pulsed strong magnetic field using the spiral current. Deionized cooling water is circulated in the water-cooling tank of the water-cooling section to remove the heat generated by Joule heating in the current-carrying sections. The semi-circular fixing holes of the fixing section, in conjunction with fixing studs, fasten the lamination assembly to the upper and lower pressure plates as a whole. At the same time, the stainless steel fixing section, due to its lower conductivity than the copper current-carrying section, forces the current to concentrate inward in the current-carrying section. Insulating sheets isolate adjacent laminations to prevent inter-turn short circuits and ensure that the current is transmitted along the spiral path.

[0057] Structural strength: The copper-steel composite welded structure improves the overall electromagnetic resistance of the coil by more than 50%. Under the electromagnetic force generated by a 50kA pulse current, the maximum stress of the coil is ≤180MPa, which is far lower than the yield strength of stainless steel and there is no risk of plastic deformation. The fastening design of the fixing stud and pressure plate ensures that the axial displacement of the lamination group is ≤0.1mm, resulting in excellent structural stability.

[0058] Cooling and conductivity: The conductivity of the copper current-carrying part is ≥58MS / m, and the current transmission loss is ≤3%; the closed flow channel formed by the water cooling tank improves the cooling efficiency by 40%, and the maximum temperature of the coil is ≤45℃ when operating at a repetition frequency (1Hz), thus avoiding insulation aging.

[0059] Insulation performance: The inter-turn insulation sheet ensures that the insulation resistance between adjacent laminations is ≥100MΩ, eliminating the risk of short circuit and ensuring stable operation of the coil under 20kV high-voltage pulse.

[0060] The inlet and outlet holes of the stacked plates are both circular holes with a diameter of 8mm-10mm, and are located at both ends of the water-cooling section. The center of the inlet hole is 15mm away from the edge of the stacked plates. The outlet hole and the inlet hole are symmetrically distributed along the length of the water-cooling tank. The inner wall of the hole is honed (roughness Ra≤0.8μm) to reduce water flow resistance.

[0061] Connection method: The water inlet and outlet holes of adjacent stacked plates are coaxially aligned, with a coaxiality error of ≤0.1mm; when stacking plates, the water outlet hole of the upper plate is directly connected to the water inlet hole of the lower plate to form a series flow channel; the total length of the flow channel is calculated according to the number of stacked plates (e.g., the total length of the flow channel for 25 stacked plates is about 7.5m), and the water flow velocity is controlled at 1.5m / s-2m / s to ensure cooling uniformity.

[0062] Hole diameter matching: The inlet and outlet holes have the same diameter and are compatible with external water pipe interfaces (such as using DN8 water pipe fittings). The fittings are fixed to the holes by welding to ensure no leakage.

[0063] Cooling water flows in from the coil inlet of the current-introducing plate, first entering the inlet of the topmost lamination, flowing through the water-cooling tank of that lamination, and then flowing out from the outlet. It then flows directly into the inlet of the next lamination, and so on, until it flows through all the laminations and finally merges into the coil outlet of the current-leading plate from the outlet of the bottommost lamination, forming a series cooling cycle. The series flow channel ensures that the cooling water is in full contact with each lamination, with no dead corners in cooling, and the water flow path is fixed with stable flow resistance, ensuring heat dissipation efficiency.

[0064] Cooling efficiency: The series flow channel increases the cooling water utilization rate by 60%. Compared with decentralized cooling, the temperature difference between the coil laminations is ≤5℃ when operating at a repetition frequency (1Hz), avoiding local overheating. Under a 50kA pulse current, single-cycle cooling can remove more than 80% of the Joule heat.

[0065] Flow channel stability: The clearly defined orifice connection design ensures that the water flow resistance fluctuation is ≤5%, avoiding sudden pressure rises due to obstructed flow channels; no additional connecting pipes are required, reducing leakage points, and no leakage was observed under water pressure testing (1.5MPa), improving the reliability of the cooling system.

[0066] Sealing ring groove: It is opened on the upper surface of the water inlet hole of the laminate (the side that contacts the previous laminate). The groove is rectangular. The groove width is 0.5mm larger than the diameter of the sealing ring (e.g., a 5mm diameter sealing ring corresponds to a groove width of 5.5mm). The groove depth is 1 / 2-2 / 3 of the diameter of the sealing ring (e.g., a 5mm diameter sealing ring corresponds to a groove depth of 3mm). The center of the groove coincides with the center of the water inlet hole. The outer diameter of the groove is 4mm-6mm larger than the diameter of the water inlet hole (e.g., an 8mm hole diameter corresponds to a groove outer diameter of 12mm) to ensure that the sealing ring completely covers the edge of the hole.

[0067] Processing technology: The sealing ring groove is machined by CNC milling machine. The verticality error of the groove wall is ≤0.02mm and the roughness Ra of the groove bottom is ≤1.6μm to avoid uneven stress on the sealing ring due to irregular groove shape. After processing, the groove is cleaned (using ultrasonic cleaning and industrial alcohol as cleaning agent) to remove iron filings and oil stains to ensure tight sealing ring fit.

[0068] The sealing ring is placed in the sealing ring groove. When the stacked pieces are pressed together and secured by the fixing studs, the upper and lower pieces exert axial pressure on the sealing ring (the pressure value is controlled between 0.8MPa and 1.2MPa), causing the sealing ring to undergo elastic deformation and fill the micro-gaps at the water inlet joint (such as gaps of less than 0.1mm caused by processing), forming a static seal. The sealing ring groove restricts the radial displacement of the sealing ring, preventing it from deviating from the orifice under water pressure or vibration, and ensuring a stable sealing position.

[0069] Sealing reliability: The sealing ring groove improves the positioning accuracy of the seal by 80%. Under 1.5MPa water pressure and 1Hz repetition frequency vibration, it can work continuously for 1000 hours without leakage, completely solving the leakage problem at the hole joint.

[0070] Ease of assembly: The clearly defined groove design simplifies the assembly process of the sealing ring, improves assembly efficiency by 50%, and avoids rework caused by misalignment of the sealing ring, thus reducing assembly costs.

[0071] Copper sealing ring: Made of T2 copper with a purity of ≥99.95%, the O-ring has a circular cross-section with a diameter of 5mm-8mm and a cross-sectional tolerance of ≤0.05mm. The surface of the sealing ring is annealed (annealing temperature 400℃-450℃, holding time 30min) to reduce its hardness to HV50-HV60 and improve its plastic deformation capacity.

[0072] Pure aluminum sealing ring: Made of 1060 pure aluminum with a purity of ≥99.6%, the size is the same as that of the copper sealing ring. The surface is chemically passivated (the passivation solution is a chromate solution, and the treatment time is 10min-15min) to form a passivation film with a thickness of 1μm-2μm, which improves the corrosion resistance.

[0073] Selection criteria: When the coil operating temperature is ≤50℃, a pure aluminum sealing ring can be used (lower cost); when the operating temperature is >50℃ or the water pressure is >1.5MPa, a copper sealing ring (better high temperature and high pressure resistance) should be used; in practical applications, other models (such as oxygen-free copper sealing rings) can also be selected for this component, but this application does not limit this.

[0074] After the sealing ring is assembled into the sealing ring groove, it undergoes plastic deformation under the tightening force of the upper and lower pressure plates. Its high plasticity allows it to fully fill the macroscopic gaps (such as less than 0.2mm) and microscopic unevenness (such as surface roughness of Ra0.8μm) at the orifice joint, forming a gapless seal. Copper and pure aluminum have good chemical stability and do not have electrochemical corrosion reaction when in contact with stainless steel sheets. They also have excellent high temperature resistance and will not age or fail elastically under the temperature fluctuations of repeated operation.

[0075] Sealing life: The metal sealing ring has a sealing life of ≥5000 hours under a water pressure of 1.5MPa and a temperature of 50℃, which is more than 5 times that of the traditional rubber sealing ring, reducing the frequency of maintenance.

[0076] Weather resistance: The sealing performance of the sealing ring does not change significantly within the temperature range of -20℃ to 80℃; the contact resistance with stainless steel and copper is ≤10mΩ, avoiding the influence of impurities caused by corrosion on the insulation performance; there is no leakage under water pressure test (2MPa), meeting the high pressure cooling requirements.

[0077] Semicircular fixing holes: The quantity is set to 7, the hole diameter is 12mm (matching the fixing stud), the semicircular opening of the hole faces the outside of the coil (that is, the inner arc surface of the hole is parallel to the inner arc surface of the fixing part); the center of the hole is located on the concentric circle of the outer diameter of the coil (e.g., the outer diameter of the coil is 500mm, the diameter of the circle where the center is located is 480mm), the deviation of the central angle of adjacent holes is ≤0.5° (theoretical central angle 45° / (7-1)≈7.5°), to ensure uniform distribution.

[0078] Fixed part dimensions: The width of the fixed part is 20mm-25mm. Its outer arc surface is consistent with the outer diameter of the coil, and its inner arc surface is connected to the outer arc surface of the water cooling part (transition fillet radius 3mm); the wall roughness of the semi-circular fixing hole is Ra≤3.2μm, and the edge of the hole is rounded (fillet radius 1mm) to avoid scratching the insulating sleeve during assembly.

[0079] After the fixing stud passes through the semi-circular fixing hole, the upper and lower pressure plates are tightened to the lamination assembly. The seven evenly distributed fixing holes ensure that the tightening force is evenly distributed along the circumference of the coil, with a force deviation of ≤10% at each fixing point, preventing warping of the lamination assembly due to uneven force. The fixing part is located on the outermost side of the coil, and its material (stainless steel) has a resistivity of approximately 70μΩ. The resistivity of copper (approximately 1.7 μΩ) is much higher than that of the current-carrying section. According to the skin effect and the principle of minimum impedance, the pulse current will preferentially flow through the inner low-resistance part, reducing the dispersion of current to the outer fixed part.

[0080] Structural stability: The uniformly distributed fixing holes ensure that the axial flatness error of the laminated group is ≤0.2mm. Under the electromagnetic force of a 50kA pulse current, the radial displacement of the coil is ≤0.1mm, with no risk of structural loosening.

[0081] Electromagnetic performance: The current concentration ratio is increased to over 95% (i.e., over 95% of the current flows through the current-carrying part), and the magnetic field strength is increased by 8%-10% compared to a design without a fixed part; the Joule loss of the fixed part is reduced by 60%, reducing additional heat generation and easing the cooling burden.

[0082] Insulating sleeve: Made of polyetheretherketone (PEEK), with excellent insulation performance (volume resistivity ≥10). 16 Ω cm, breakdown voltage ≥30kV / mm), bushing outer diameter 12mm (matching the diameter of the semi-circular fixing hole), inner diameter 6mm (matching the outer diameter of the fixing stud), length consistent with the total thickness of the laminations (e.g., 25 laminations correspond to a bushing length of 150mm); each end of the bushing extends 5mm-8mm beyond the lamination group to ensure insulation with the upper and lower pressure plates.

[0083] Assembly method: The insulating sleeve is pre-fitted into the fixing stud, and then passes through the semi-circular fixing hole together with the stud; the gap between the sleeve and the fixing hole is ≤0.1mm to avoid the sleeve from shifting due to vibration; a PEEK insulating gasket (2mm-3mm thick, 15mm in diameter) is added to each of the contact parts between the sleeve and the upper and lower pressure plates to further enhance the insulation effect.

[0084] Insulating sleeve selection: In this embodiment, PEEK insulating sleeve of model PEEK-1000 is selected. This model has the characteristics of high temperature resistance (long-term operating temperature 260℃) and high voltage resistance, and is suitable for the coil repetition frequency working environment. In practical applications, other models (such as polyimide insulating sleeves) can also be selected for this component. This embodiment does not limit this.

[0085] The insulating sleeve is fitted over the outside of the fixing stud, completely isolating the stud from the metal contact between the stud and the lamination, so that the stud only performs the function of mechanical fastening and does not participate in current transmission; the high insulation performance of PEEK material ensures that the insulation resistance between the stud and the lamination is ≥1000MΩ, and there will be no breakdown even under high voltage pulse (20kV); the insulating gasket further blocks the current path between the stud and the pressure plate, forming full-path insulation, ensuring the integrity of the insulation between coil turns, and the current is transmitted along the preset spiral path.

[0086] Insulation reliability: The insulating bushing ensures that the insulation resistance between the stud and the lamination is ≥1000MΩ, and there is no breakdown under 20kV high voltage pulse, completely eliminating the short circuit risk caused by metal studs.

[0087] Structural adaptability: The size of the insulating sleeve is precisely matched with the stud and fixing hole, and there is no looseness after assembly. Under 1Hz repetition frequency vibration, the sleeve displacement is ≤0.05mm, which does not affect the insulation effect. Moreover, the PEEK material is resistant to aging and its service life is consistent with that of the coil body, so no additional replacement is required.

[0088] Weld type: Butt weld is used, the weld cross section is V-shaped, the bevel angle is 60°-70°, the blunt edge thickness is 1mm-1.5mm, and the gap is 0.5mm-1mm to ensure full penetration and avoid burn-through.

[0089] Welding process: Fully automatic argon arc welding is adopted, the welding material is ER316L stainless steel welding wire (diameter 1.2mm), the shielding gas is 99.99% pure argon (flow rate 15L / min-20L / min); the welding current is 120A-150A, the arc voltage is 18V-20V, and the welding speed is 5mm / s-8mm / s; welding is carried out in two layers. After the first layer is welded, penetrant testing (PT) is performed. If no defects are found, the second layer is welded. After the second layer is welded, radiographic testing (RT) is performed to ensure that the weld pass rate is ≥99.5%.

[0090] Post-weld treatment: The weld surface is ground (roughness Ra≤3.2μm) to remove weld beads and spatter; then solution treatment is performed (temperature 1050℃-1100℃, holding time 30min, water cooling) to eliminate welding stress and improve the corrosion resistance of the weld.

[0091] Argon arc welding is used to form a metallurgical bond between the water-cooled tank cover plate and the water-cooled part. The weld completely seals the water-cooled tank, preventing cooling water from leaking from the connection surface between the tank body and the cover plate. V-groove and layered welding ensure that the weld is fully penetrated, free of defects such as porosity and cracks, and guarantee the strength and sealing of the weld. Post-weld treatment eliminates welding stress and avoids cracking of the weld due to stress concentration under temperature fluctuations or vibration, ensuring long-term stable sealing of the cooling channel.

[0092] Sealing performance: The weld seam was tested with 1.5MPa water pressure and held for 30 minutes without leakage. Penetrant testing and radiographic testing showed no defects, and the sealing qualification rate was 100%, completely solving the leakage problem of water cooling tank connection.

[0093] Structural strength: The tensile strength of the weld is ≥500MPa, consistent with the strength of the base material of the water-cooled part. Under the action of electromagnetic force and temperature stress, the weld does not deform or crack, ensuring the structural integrity of the water-cooled part; post-weld treatment reduces welding stress by more than 60%, improving the overall fatigue resistance of the coil.

[0094] Weld type: Brazing is used, with a weld width of 5mm-8mm and a thickness of 3mm-5mm. The joint surface is sandblasted (roughness Ra5μm-8μm) to increase the contact area and improve the welding strength and heat conduction efficiency.

[0095] Welding materials and process: The brazing filler metal is a Cu-P alloy (composition Cu-7P, melting point 640℃-650℃), combined with QJ201 flux (to remove oxide film); induction heating is used, with a heating temperature of 680℃-700℃, a holding time of 5min-8min, and a heating rate of 5℃ / s-8℃ / s to ensure that the brazing filler metal is fully melted and fills the joint gap (gap 0.1mm-0.2mm).

[0096] Post-weld treatment: After welding, use hot water (80℃-90℃) to clean the residual flux to avoid flux corrosion; then perform low-temperature annealing (temperature 200℃-250℃, holding time 1h) to eliminate welding stress and improve weld toughness.

[0097] During brazing, the Cu-P filler metal melts and forms an alloy layer at the interface between the copper and stainless steel, achieving a metallurgical bond between the two. The weld not only provides sufficient mechanical strength (tensile strength ≥ 200 MPa) and resists electromagnetic impact, but also forms a low-resistance heat conduction path (weld thermal conductivity ≥ 100 W / (m²)). The Joule heat generated in the flow passage section is rapidly conducted to the water-cooled section through the weld, and then carried away by the cooling water, thus avoiding local overheating of the flow passage section.

[0098] Mechanical strength: The tensile strength of the copper-steel welded joint is ≥200MPa. Under the electromagnetic force of a 50kA pulse current, the joint does not separate or deform, ensuring the stability of the coil structure.

[0099] Thermal conductivity: Weld thermal conductivity ≥100W / (m K), the thermal resistance between the flow passage and the water cooling section is reduced to below 0.01K / W, the maximum temperature of the flow passage during high-frequency operation is ≤45℃, the heat dissipation efficiency is improved by 30%, and the copper softening caused by overheating is avoided.

[0100] Current inlet plate and coil inlet: The current inlet plate is made of T2 copper with a thickness of 10mm-12mm and an area consistent with the contact area of ​​the upper pressure plate (e.g., 500mm×500mm); the coil inlet is located at the edge of the inlet plate (20mm from the edge), and is a threaded hole (specification G1 / 2) with a depth of 8mm-10mm and a tapping accuracy of 6H on the inner wall of the hole; the inlet is connected to the inlet hole of the uppermost lamination through an internal flow channel, the diameter of which is consistent with the inlet hole of the lamination (8mm-10mm), and the inner wall of the flow channel is polished (Ra≤0.8μm).

[0101] Current lead-out piece and coil outlet: The structure is symmetrical with the current lead-in piece. The outlet is also a G1 / 2 threaded hole, which is opened on the edge of the lead-out piece and is connected to the outlet hole of the bottom layer through the internal flow channel. The positions of the inlet and outlet are symmetrically distributed along the circumference of the coil (central angle 180°) to ensure that the water flow path is consistent with the current path (both from the upper layer to the lower layer).

[0102] Interface accessories: Each inlet and outlet is equipped with a brass right-angle connector (model G1 / 2-90°). The connector and the hole are sealed with PTFE tape (wrapped 5-8 times). The other end of the connector is connected to a high-pressure resistant hose (working pressure ≥2MPa) for connection with an external cooling system.

[0103] The deionized cooling water from the external cooling system flows into the coil inlet of the current inlet plate through a hose and a right-angle connector. It then enters the inlet hole of the top lamination through the internal flow channel of the inlet plate, and then flows through all the laminations in series. After absorbing heat, it flows into the internal flow channel of the current lead plate from the outlet hole of the bottom lamination, and finally flows out from the coil outlet, returning to the external cooling system. The water flow path is completely consistent with the current path (from the inlet plate to the lead plate), so that the cooling water gradually absorbs heat from the current inlet end, avoiding local heat accumulation.

[0104] Cooling uniformity: The water flow and current path are consistent, and the temperature difference between different parts of the coil is ≤5℃. Compared with the asymmetrical layout, the temperature at the current inflow end is reduced by 8℃-10℃, which completely solves the problem of local overheating.

[0105] System integration: The inlet and outlet ports are integrated with the current input / output plates, reducing the number of external pipe fittings (reducing 4-6 connection points) and improving assembly efficiency by 40%; the threaded interface and sealing design ensure no leakage at the connection points, reliable sealing under 1.5MPa water pressure, and simple pipeline layout for easy maintenance.

[0106] Dimensional parameters: The stacked laminations are in a fan-shaped ring structure with an outer radius of R2 (e.g., 250mm) and an inner radius of R1 (e.g., 80mm). The central angles of the opening and the boss are both 45° (1 / 8 of the circumference). The radial width of the boss (from the inner circle to the outer circle) is consistent with the flow passage (e.g., 30mm), and the axial height is 2mm-3mm. The radial width of the opening matches the width of the boss, ensuring that when adjacent laminations are stacked, the boss can be fully embedded in the opening to achieve surface contact.

[0107] Machining accuracy: The central angle error between the opening and the boss is ≤0.1°, the radial dimension tolerance is ≤0.05mm, the surface flatness of the boss is ≤0.02mm / m, ensuring that the contact area of ​​adjacent stacked bosses is ≥95%; the boss surface is silver-plated (plating thickness 5μm-10μm), the plating uniformity error is ≤10%, and the contact resistance is reduced.

[0108] Functional adaptation: The 1 / 8 circumference size design allows the stacked plates to form a continuous spiral current path (the current direction of each stacked plate deflects 45° along the circumference), while reserving sufficient space for the water cooling part (occupying 3 / 8 circumference) and the fixing part (occupying 3 / 8 circumference), ensuring that the functional areas do not overlap and the structure is compact.

[0109] Each lamination has a 45° boss that mates with the opening of the adjacent lamination. The silver plating on the surface of the boss reduces contact resistance, allowing current to flow smoothly from one lamination to the next. Through the sequential connection of multiple laminations, a complete spiral current loop is formed (total deflection angle 360°-720°). The 45° opening size avoids breaks in the current path and does not encroach on the space of the water cooling and fixing parts, ensuring the normal operation of each functional area. Precise dimensional and accuracy control ensures that the gap between adjacent laminations is ≤0.05mm, reducing current transmission loss.

[0110] Electrical connection reliability: The contact area of ​​the boss is ≥95%, the contact resistance is ≤5mΩ, the current transmission loss is ≤2%, and the temperature rise at the boss is ≤3℃ under a 50kA pulse current, with no overheating phenomenon.

[0111] Structural compatibility: The 1 / 8 circumference opening and boss design allows for a reasonable layout of the water cooling, fixing and flow passage parts, with each area functioning without interference, increasing the utilization rate of stacked space by 30%; and the standardized size design facilitates mass production, with a processing qualification rate of ≥98%, reducing production costs.

[0112] Example 2 The coil is positioned between the upper pressure plate 4 and the lower pressure plate 5. A current inlet piece 1 is positioned between the coil and the upper pressure plate 4, and a current outlet piece 2 is positioned between the coil and the lower pressure plate 5. The coil is fixed to the upper pressure plate 4 and the lower pressure plate 5 by eight fixing studs 6. The fixing studs 6 are insulated from each lamination piece 3 by an insulating sleeve 10.

[0113] Mechanical strength comparison: Comparative example: Traditional pure copper coil.

[0114] Simulation data: Under the electromagnetic force impact generated by the same peak pulse current (e.g., 50kA), finite element analysis simulation shows that the peak von Mises stress inside a traditional pure copper coil reaches 350MPa, which is close to the yield limit of copper, posing a risk of plastic deformation. However, the copper-steel composite structure coil of this invention, supported by a stainless steel frame, reduces the peak stress to 180MPa, far below the yield strength of stainless steel. The coil maintains fully elastic deformation, exhibiting extremely high safety margin and lifespan.

[0115] Cooling efficiency comparison: Comparative example: A conventional pulse magnetic field coil without a built-in water cooling tank, relying on external cooling.

[0116] Experimental data: Under high-repetition-rate (PRR) operating mode (e.g., 1 pulse per second, pulse width 100ms), the coil temperature rise was measured using an infrared thermal imager. Conventional coils, after 10 consecutive pulses, exhibit a central temperature exceeding 120°C, leading to decreased insulation performance and necessitating shutdown for natural cooling. In contrast, the coil of this invention, under the same operating conditions, with forced cooling using 25°C deionized water (flow rate 5L / min), maintained a maximum temperature below 45°C after 100 consecutive pulses, achieving true stable PRR operation and improving efficiency by an order of magnitude.

[0117] In summary, the water-cooled pulsed high magnetic field coil of the present invention adopts a copper-steel composite structure, which not only has high strength and long life, but also has a water-cooling tank arranged in the coil, which can remove the heat generated by the high magnetic field coil during operation, prevent the insulation damage between turns caused by overheating of the coil, and effectively solve the cooling problem of the coil under high frequency operation.

[0118] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A water-cooled pulsed high-magnetic field coil, characterized by, The application relates to a coil structure, which comprises an upper pressing plate (4), a plurality of laminations (3) and a lower pressing plate (5), the plurality of laminations (3) are arranged in a stacked mode between the upper pressing plate (4) and the lower pressing plate (5), each lamination (3) has an opening and a boss (302), the boss (302) is electrically connected with an adjacent lamination (3), thereby forming a spiral structure. Each lamination (3) comprises a through-flow part (304), a water-cooling part (306) and a fixing part (305). The through-flow part (304) is made of red copper, the water-cooling part (306) and the fixing part (305) are made of stainless steel, and the through-flow part (304) is integrally formed with the water-cooling part (306) and the fixing part (305) through welding. The water-cooling part (306) is provided with a water-cooling groove (307) which is sealed through a water-cooling groove cover plate (12), the water-cooling groove cover plate (12) is welded and connected with the water-cooling part (306); the fixing part (305) is provided with a plurality of semicircular fixing holes (301) for forcing the current to flow to the inner side of the coil. Insulating sheets (11) for turn-to-turn insulation are arranged between two adjacent laminations (3). A current introduction sheet (1) is arranged between the upper pressing plate (4) and the coil, and a current lead-out sheet (2) is arranged between the lower pressing plate (5) and the coil. The upper pressing plate (4) and the lower pressing plate (5) fix the coil together through fixing studs (6) and fixing nuts (7).

2. The water-cooled pulsed high-magnetic field coil according to claim 1, characterized by, One end of the water-cooling groove (307) is provided with a lamination water inlet hole (303), and the other end is provided with a lamination water outlet hole (121), the lamination water inlet hole (303) is communicated with the lamination water outlet hole (121) of the previous lamination (3), and the lamination water outlet hole (121) is communicated with the lamination water inlet hole (303) of the next lamination (3).

3. The water-cooled pulsed high-magnetic field coil according to claim 2, characterized by A sealing ring groove (13) is arranged around the lamination water inlet hole (303) for placing a sealing ring.

4. The water-cooled pulsed high-magnetic-field coil according to claim 3, characterized by The sealing ring is a red copper or pure aluminum sealing ring.

5. The water-cooled pulsed high-magnetic field coil according to claim 1, characterized by The fixing part (305) comprises a plurality of semicircular fixing holes (301) which are uniformly distributed on the outermost side of the coil.

6. The water-cooled pulsed high-magnetic field coil according to claim 5, characterized by The fixing stud (6) passes through the semicircular fixing hole (301) and is insulated from each lamination (3) through an insulating sleeve (10).

7. The water-cooled pulsed high-magnetic field coil according to claim 1, characterized by The water-cooling groove cover plate (12) is connected with the water-cooling part (306) through a water-cooling groove and a water-cooling groove cover plate welding seam (308).

8. The water-cooled pulsed high-magnetic field coil according to claim 1, characterized by The through-flow part (304) is connected with the water-cooling part (306) through a through-flow part and water-cooling part welding seam (309).

9. The water-cooled pulsed high-magnetic field coil according to claim 1, characterized by, The current introduction sheet (1) is provided with a coil water inlet (8) for inflow of cooling water, and the current lead-out sheet (2) is provided with a coil water outlet (9) for outflow of cooling water.

10. The water-cooled pulsed high-magnetic field coil according to claim 1, characterized by, The opening and the boss (302) of each lamination (3) each account for 1 / 8 of the circumference of the lamination.

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