Fatigue-resistant water-cooled magnet arrangement

Abstract

This invention relates to the field of water-cooled magnet technology, specifically to an anti-fatigue water-cooled magnet device. It includes a container assembly, a central tube assembly, and a magnet coil assembly disposed inside the container assembly. The central tube assembly is located at the center of the container assembly, and the magnet coil assembly is sleeved on the outside of the central tube assembly. The magnet coil assembly includes multiple coils radially connected in sequence. The two innermost coils are sleeved on the outside of the central tube assembly and are movable along the axial direction of the central tube assembly inside the container assembly. The remaining coils are fixed inside the container assembly. The advantage of this invention is that it ensures that the actual magnetic midplane of the two innermost coils coincides with the remaining coils, reducing the electromagnetic force generated between the coils, thereby reducing the fatigue rate of the coils and significantly improving the lifespan of the water-cooled magnet device.

Description

Technical Field

[0001] This invention relates to the field of water-cooled magnet technology, specifically to an anti-fatigue water-cooled magnet device. Background Technology

[0002] Strong magnetic fields are important extreme conditions, providing unique extreme environments for scientific research. The structure and transformation processes of matter within these environments can undergo changes, offering new avenues and opening up new avenues for research in physics, chemistry, materials science, and biology. Because higher magnetic field strength leads to greater changes in the electronic energy states of matter systems, it results in more unusual phenomena and provides more opportunities for scientific innovation. Therefore, steady-state strong magnetic field experimental facilities, as an effective method for obtaining high magnetic fields, have become an irreplaceable and crucial tool for conducting cutting-edge basic research in condensed matter physics, magnetism, materials science, chemistry, life sciences, and medicine.

[0003] High-field water-cooled magnets are the main experimental devices in steady-state strong magnetic field laboratories. Due to their high magnetic field strength, fast excitation speed, and high experimental efficiency, they are highly regarded extreme condition experimental platforms.

[0004] The magnetic center of a high-field water-cooled magnet is the region with the strongest magnetic field in the magnet device, and it is also the sample placement area for scientists' research; it is the core area of ​​the device. The mechanical magnetic mid-plane of a high-field water-cooled magnet is the plane perpendicular to the coil axis at the midpoint of the axial dimension of each coil. However, the mechanical magnetic mid-plane is the mid-plane of the coil's mechanical dimensions, and there will be differences in the actual magnetic mid-plane of the water-cooled magnet device during actual operation, with deviations generally within 5mm. Traditional water-cooled magnet devices have coils that are tightly connected, meaning the actual magnetic mid-plane cannot be dynamically adjusted according to the actual magnetic mid-plane position of the water-cooled magnet device. When the actual magnetic mid-plane of different coils differs from the overall magnetic mid-plane of the fatigue-resistant water-cooled magnet device, tens of tons of electromagnetic force will be generated between the coils, accelerating coil fatigue and significantly reducing the device's lifespan. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to improve the lifespan of water-cooled magnet devices.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A fatigue-resistant water-cooled magnet device includes a container assembly, a central tube assembly and a magnet coil assembly disposed inside the container assembly, the central tube assembly being located at the center of the container assembly, and the magnet coil assembly being sleeved outside the central tube assembly; The magnet coil assembly includes multiple coils that are radially connected in sequence. The two innermost coils are sleeved outside the central tube assembly and can move along the axial direction of the central tube assembly inside the container assembly. The remaining coils are fixed inside the container assembly.

[0008] The present invention arranges the two innermost coils inside the container assembly, which are sleeved outside the central tube assembly and can move along the axial direction of the central tube assembly. This allows the two coils to move vertically, ensuring that the actual magnetic plane of the two innermost coils coincides with that of the other coils. This reduces the electromagnetic force generated between the coils, thereby reducing the fatigue rate of the coils and greatly improving the lifespan of the water-cooled magnet device.

[0009] Preferably, the magnet coil assembly includes three coils A, B, and C connected in series radially. Coil A is sleeved outside the central tube assembly. Coil A and coil B are movable inside the container assembly along the axial direction of the central tube assembly. Coil C is fixed inside the container assembly. Coil C is electrically connected to coil B through a conductive flexible connector. Coil B is electrically connected to coil A through an electrical connection plate.

[0010] Preferably, the top of coil A and coil B are respectively provided with a first mounting hole and a second mounting hole, and a first mounting pin and a second mounting pin are respectively provided in the first mounting hole and the second mounting hole. The ends of the first mounting pin and the second mounting pin away from coil A and coil B are connected to the top of the container assembly, and the bottoms of the first mounting pin and the second mounting pin are respectively separated from the bottom of the first mounting hole and the second mounting hole. The electrical connection plate is connected to the bottom of the container assembly through an anti-rotation structure. The anti-rotation structure includes an anti-rotation insulating plate, an anti-rotation sleeve, an anti-rotation ring, and a positioning pin. The anti-rotation sleeve is connected to the electrical connection plate through the anti-rotation insulating plate. An anti-rotation ring is fitted at the bottom of the anti-rotation sleeve and is connected to the bottom of the container assembly. Multiple vertical sliding grooves are provided circumferentially on the inner wall of the anti-rotation ring. The anti-rotation sleeve is provided with positioning pins in the same position and number as the vertical sliding grooves. The end of the positioning pin away from the anti-rotation sleeve extends into the sliding groove.

[0011] Preferably, the container assembly includes a cylindrical wall, a container top cover, a container bottom cover, support legs, and electrical connections. The top and bottom ends of the cylindrical wall are respectively connected to the container top cover and the container bottom cover. The central tube assembly and the magnet coil assembly are disposed inside the cylindrical wall, and multiple electrical connections penetrate the cylindrical wall and are electrically connected to the magnet coil assembly.

[0012] Preferably, the central tube assembly includes a tube body, a cap, an insulating positioning cylinder, a superconducting coil, a stop coil, and a sample rod. The tube body passes through the innermost coil of the magnet coil assembly and is fixed between the top and bottom of the container assembly. The bottom of the tube body is sealed and the top is open. The cap is placed on the top of the tube body to seal the top opening of the tube body. A vacuum cavity is provided on the tube body. An insulating positioning cylinder is provided in the inner cavity of the tube body. A superconducting coil and a stop coil are coaxially arranged on the insulating positioning cylinder. The stop coil is sleeved outside the superconducting coil and there is a gap between them. The sample end of the sample rod passes through the cap and is sealed at the center of the superconducting coil.

[0013] By setting up the central tube assembly, the uniformity of the magnetic center area is ensured and signal interference is reduced. The installation of the low-temperature Dewar is eliminated, the structure of the water-cooled magnet device is simplified, and the sample only needs to be placed into the sample end of the sample rod, and then the sample rod is inserted into the tube body and fixed on the cap, making the installation simple and convenient.

[0014] Preferably, there is a gap between the inner wall of the tube and the insulating positioning cylinder and the outer wall of the resistive coil, and a gap between the top end face of the insulating positioning cylinder and the cover, so that the gap between the inner wall of the tube and the insulating positioning cylinder is connected to the inner cavity of the insulating positioning cylinder.

[0015] Preferably, the insulating positioning cylinder includes an upper insulating positioning cylinder and a lower insulating positioning cylinder. The top of the upper insulating positioning cylinder is connected to the cap, and the bottom of the lower insulating positioning cylinder abuts against the bottom of the tube body. The superconducting coil and the resistive coil are coaxially arranged between the bottom of the upper insulating positioning cylinder and the top of the lower insulating positioning cylinder.

[0016] Preferably, the bottom end face of the upper insulating positioning cylinder is a stepped surface, which includes a first step, a second step, and a vertical step. The height of the first step is higher than that of the second step, and the vertical step is located between the first and second steps. The top end face and outer side of the superconducting coil are respectively attached to the first step and the vertical step. A positioning groove is provided on the inner wall of the top of the resistive coil. The bottom of the positioning groove is attached to the second step, and the wall of the positioning groove is attached to the outer wall of the bottom of the upper insulating positioning cylinder.

[0017] Preferably, a lower positioning groove is provided on the top end face of the lower insulating positioning cylinder, the bottom of the superconducting coil is engaged in the lower positioning groove, and the bottom end face of the resistive coil is attached to the top end face of the lower insulating positioning cylinder.

[0018] Preferably, the bottom end face of the upper insulating positioning cylinder is provided with a plurality of upper radial grooves, and the top end face of the lower insulating positioning cylinder is provided with a plurality of lower radial grooves. Both the upper radial grooves and the lower radial grooves are connected to the gap between the resistive coil and the superconducting coil.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention has two innermost coils that are sleeved outside the central tube assembly and can move along the axial direction of the central tube assembly inside the container assembly. This allows the two coils to move vertically, ensuring that the actual magnetic plane of the two innermost coils coincides with that of the other coils. This reduces the electromagnetic force generated between the coils, thereby reducing the fatigue rate of the coils and greatly improving the lifespan of the water-cooled magnet device.

[0020] 2. In this invention, the uniformity of the magnetic center area and the reduction of signal interference are ensured by setting the central tube assembly. The installation of the low-temperature Dewar is eliminated, the structure of the water-cooled magnet device is simplified, and the sample only needs to be placed into the sample end of the sample rod, and then the sample rod is inserted into the tube body and fixed on the cap, which makes the installation simple and convenient. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the anti-fatigue water-cooled magnet device according to an embodiment of the present invention; Figure 2 This is a partial structural diagram of an embodiment of the present invention; Figure 3 This is a schematic diagram of the cardiac tube assembly in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the insulating positioning cylinder in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the insulating positioning cylinder according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the stop coil in an embodiment of the present invention; Figure 7 This is a partial structural schematic diagram of the magnet coil assembly according to an embodiment of the present invention; Figure 8 This is another partial structural schematic diagram of the magnet coil assembly according to an embodiment of the present invention; Figure 9 This is another partial structural schematic diagram of the magnet coil assembly according to an embodiment of the present invention. Detailed Implementation

[0022] To facilitate understanding of the technical solution of the present invention by those skilled in the art, the technical solution of the present invention will now be further described in conjunction with the accompanying drawings.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited.

[0025] See Figure 1This embodiment discloses an anti-fatigue water-cooled magnet device, including a container assembly 1, a central tube assembly 2 and a magnet coil assembly 3 disposed inside the container assembly 1. The central tube assembly 2 is located at the center of the container assembly 1, and the magnet coil assembly 3 is sleeved on the outside of the central tube assembly 1.

[0026] The container assembly 1 includes a cylindrical wall 11, a container top cover 12, a container bottom cover 13, a support leg 14, and electrical connections 15. The top and bottom ends of the cylindrical wall 11 are respectively connected to the container top cover 12 and the container bottom cover 13. The central tube assembly 2 and the magnet coil assembly 3 are disposed inside the cylindrical wall 11. Multiple electrical connections 15 penetrate the cylindrical wall 11 and are electrically connected to the magnet coil assembly 3.

[0027] See Figure 2 and Figure 3 The central tube assembly 2 includes a tube body 21, a cap 22, an upper pressure ring 23, a lower pressure ring 24, an insulating positioning cylinder 25, a superconducting coil 26, a resistance coil 27, and a sample rod 28.

[0028] The tube 21 passes through the innermost coil of the magnet coil assembly 3 and is fixed between the container top cover 12 and the container bottom cover 13. The bottom of the tube 21 is sealed and the top is open. The open end of the top of the tube 21 passes through the container top cover 12 and is sealed by the cap 22. The cap 22 is fixed to the top surface of the container top cover 12 by the upper pressure ring 23, and the bottom of the tube 21 is fixed to the container bottom cover 13 by the lower pressure ring 24.

[0029] The tube body 21 is equipped with a vacuum chamber 211, and multiple vacuum evacuation holes communicating with the vacuum chamber 211 are provided at the lower end of the tube body 21. These holes are used to evacuate the vacuum chamber 211 and detect the corresponding vacuum level. When the liquid nitrogen vacuum insulation requirement is met, the chamber is sealed with a plug. Both the inner and outer walls of the tube body 21 are provided with heat insulation layers to reduce the conduction of low temperature in the chamber and to provide electrical insulation between the tube body 21 and the magnet coil assembly 3 and the resistive coil 27.

[0030] An insulating positioning cylinder 25 is provided inside the tube body 21. There is a gap between the inner wall of the tube body 21 and the outer wall of the insulating positioning cylinder 25 and the resistance coil 27. A superconducting coil 26 and a resistance coil 27 are coaxially arranged on the insulating positioning cylinder 25. The resistance coil 27 is sleeved outside the superconducting coil 26 and there is a gap between them. One end of the sample rod 28 is a fixed end and is sealed and fixed on the cap 22. The other end is the sample end, which passes through the cap 22 and is located at the center of the superconducting coil 26.

[0031] Specifically, the insulating positioning cylinder 25 includes an upper insulating positioning cylinder 251 and a lower insulating positioning cylinder 252, both of which are hollow inside. The top of the upper insulating positioning cylinder 251 is connected to the cover 22 by multiple fixing pins, and there is a gap between the top end face of the upper insulating positioning cylinder 251 and the bottom face of the cover 22, so that the gap between the inner wall of the tube body 21 and the insulating positioning cylinder 25 is connected to the inner cavity of the insulating positioning cylinder 25. The bottom of the lower insulating positioning cylinder 252 abuts against the bottom of the tube body 21. The superconducting coil 26 and the resistive coil 27 are coaxially arranged between the bottom of the upper insulating positioning cylinder 251 and the top of the lower insulating positioning cylinder 252.

[0032] The cap 22 is provided with multiple injection holes for injecting liquid nitrogen into the tube 21.

[0033] Furthermore, a temperature recovery hole (not shown in the figure) is provided at the bottom of the tube 21, which communicates with the inner cavity of the tube 21. When liquid nitrogen is injected into the tube 21, it is sealed with a plug to achieve cooling inside the tube 21. When the inside of the tube 21 needs to be cooled back to room temperature, the liquid nitrogen or low-temperature nitrogen gas inside the tube 21 is discharged through the temperature recovery hole by applying pressure without injecting liquid nitrogen through the injection hole provided on the cap. At the same time, the temperature recovery hole is also used to lead out the electrical lead wire of the resistance coil 27 and the temperature monitoring signal line of the superconducting coil 26.

[0034] See Figure 4 The bottom end face of the upper insulating positioning cylinder 251 is a stepped surface, which includes a first step surface 25101, a second step surface 25102 and a vertical step surface 25103. The height of the first step surface 25101 is higher than that of the second step surface 25102. The vertical step surface 25103 is disposed between the first step surface 25101 and the second step surface 25102. The top end face and the outer side face of the superconducting coil 26 are respectively attached to the first step surface 25101 and the vertical step surface 25103.

[0035] See Figure 5 The lower insulating positioning cylinder 252 has a lower positioning groove 2521 on its top end face. The bottom of the superconducting coil 26 is engaged in the lower positioning groove 2521, and the bottom end face of the resistive coil 27 is attached to the top end face of the lower insulating positioning cylinder 252.

[0036] In this embodiment, the superconducting coil 26 and the resistive coil 27 are limited by the upper insulating positioning cylinder 251 and the lower insulating positioning cylinder 252.

[0037] Furthermore, the bottom end face of the upper insulating positioning cylinder 251 is provided with multiple upper radial grooves 2511, and the top end face of the lower insulating positioning cylinder 252 is provided with multiple lower radial grooves 2522. The upper radial grooves 2511 and lower radial grooves 2522 are connected to the gap between the resistive coil 27 and the superconducting coil 26 for the flow of liquid nitrogen, cryogenic gas, or air. The first step surface 25101 is also provided with a circumferential groove 2512 for the connection between the multiple upper radial grooves 2511. The outer wall of the upper insulating positioning cylinder 251 is provided with an upper wiring groove 2513 in the radial direction for fixing the input current line of the resistive coil 27.

[0038] The lower positioning groove 2521 on the lower insulating positioning cylinder 252 is provided with a lower circumferential groove 25211 for communication between multiple lower radial grooves 2522, further ensuring the flow of liquid nitrogen or cryogenic gas or air. Multiple sets of lower wiring grooves 2523 are provided in the radial direction on the outer wall of the lower insulating positioning cylinder 252 for fixing the input current line of the resistive coil 27 and providing a flow channel for liquid nitrogen. The bottom end face of the lower insulating positioning cylinder 252 is also provided with circumferential grooves and radial grooves to provide a channel for liquid nitrogen or wiring.

[0039] Superconducting coil 26 is a high-temperature superconducting coil that can reach a superconducting state at liquid nitrogen temperature, and is used to eliminate various interference signals.

[0040] See Figure 6 The inner wall of the top of the resistive coil 27 is provided with a positioning groove 271. The bottom of the positioning groove 271 is in contact with the second step surface 25102, and the wall of the positioning groove 271 is in contact with the bottom outer wall of the upper insulating positioning cylinder 251. Multiple first upper positioning grooves (not marked in the figure) are provided on the second step surface 25102. The bottom of the positioning groove 271 on the resistive coil 27 is provided with second upper positioning grooves 2711 corresponding to the position and number of the first upper positioning grooves. Connecting pins are provided in the first and second upper positioning grooves 2711 for connecting the upper insulating positioning cylinder 251 and the resistive coil 27, preventing the resistive coil 27 from rotating at the bottom of the upper insulating positioning cylinder 251 when energized. Specifically, in this embodiment, the resistive coil 27 is designed and wound according to the magnetic field strength distribution measured in the actual magnetic center region of the water-cooled magnet device. The rotational force of the coil is transmitted to the upper insulating positioning cylinder 251 through the resistive coil 27.

[0041] Specifically, when scientific research does not require uniformity of magnetic field strength and interference signals at the magnetic center of the water-cooled magnet device, the inside of the tube 21 is at room temperature, the vacuum chamber 211 does not need to be evacuated (atmospheric state), the resistance coil 27 is not energized, the superconducting coil 26 becomes a resistance coil, there is no current input or output, and no magnetic field is generated.

[0042] When scientific research uses a water-cooled magnet device that requires a highly uniform magnetic center region, the inside of the tube 21 is at room temperature, and the vacuum chamber 211 does not need to be evacuated and remains in normal atmospheric condition. High-pressure air and current from the resistance coil 27 are input through the liquid injection hole on the cover 22, respectively. The current from the resistance coil 27 is drawn out through the temperature recovery hole at the bottom of the tube 21. The resistance coil 27 generates a field strength to compensate for the magnetic field fluctuations of the water-cooled magnet device, thereby improving the uniformity of the magnetic field strength of the water-cooled magnet device.

[0043] When scientific research uses water-cooled magnet devices and requires reducing interference signals in the magnetic center area, the vacuum chamber 211 is evacuated to meet the liquid nitrogen insulation requirements. At the same time, liquid nitrogen is introduced into the tube 21 through the injection hole. The temperature monitoring temperature led out from the temperature recovery hole at the bottom of the tube reaches the superconducting temperature of the superconducting coil 26. The resistance coil 27 does not carry current, thereby reducing or even eliminating interference signals.

[0044] When scientific research uses water-cooled magnet devices and requires high uniformity and low interference signals in the magnetic center region, the vacuum chamber 211 is evacuated to meet the liquid nitrogen insulation requirements. At the same time, liquid nitrogen is introduced into the tube 21 through the injection hole. The temperature monitoring temperature led out from the temperature recovery hole at the bottom of the tube reaches the superconducting temperature of the superconducting coil 26. The resistance coil 27 is energized to reduce or even eliminate interference signals and improve the uniformity of magnetic field strength.

[0045] It should be noted that traditional water-cooled magnet devices suffer from low uniformity in the magnetic center region, significant interference signals generated by the support system (deionized water cooling system, power supply system, etc.) and the fatigue-resistant water-cooled magnet device itself, which affect signal acquisition and image imaging in scientific research. Therefore, in low-temperature scientific experiments conducted on high-field water-cooled magnets, a low-temperature Dewar is typically installed inside the central tube of the water-cooled magnet to hold the experimental sample. However, the low-temperature Dewar, as a separate device, has a complex structure and is inconvenient to install. In this embodiment, the central tube assembly 2 ensures uniformity in the magnetic center region and reduces signal interference, eliminating the need for a low-temperature Dewar, simplifying the structure of the water-cooled magnet device. Furthermore, it only requires placing the sample into the sample end of the sample rod 28, then inserting the sample rod 28 into the tube body 21 and fixing it to the cap 22, making installation simple and convenient.

[0046] See Figure 1 and Figure 7The magnet coil assembly 3 includes three coils, A coil 31, B coil 32, and C coil 33, which are radially connected in series. Coil A 31 is sleeved on the outside of the tube 21. Coil A 31 and coil B 32 are movable along the axial direction of the tube 21 inside the container assembly 1. Coil C 33 is fixed to the inner wall of the cylinder wall 11. Coil C 3 is electrically connected to coil B 32 through a conductive flexible connector (not shown in the figure). Coil B 32 is electrically connected to coil A 31 through an electrical connection plate 34. One end of a set of electrical connections 15 is electrically connected to coil A 31, and the other end extends out of the cylinder wall 11. One end of another set of electrical connections 15 is electrically connected to coil C 33, and the other end extends out of the cylinder wall 11.

[0047] See Figure 8 and Figure 9 The A coil 31 includes an A magnet coil 311, an upper electrode cylinder 312, an upper insulating sleeve 313, a lower electrode cylinder 314, and a first mounting pin 315. The A magnet coil 311 is sleeved on the outer wall of the tube 21. The top of the A magnet coil 311 is connected to the bottom of the upper insulating sleeve 313 through the upper electrode cylinder 312. The electrical connection 15 is electrically connected to the upper electrode cylinder 312. A plurality of first mounting holes 3101 are provided on the top end face of the upper insulating sleeve. The first mounting pin 315 is provided in the first mounting hole 3101. The end of the first mounting pin 315 away from the A magnet coil 311 is connected to the container top cover 12. There is a gap between the first mounting pin 315 and the bottom of the first mounting hole 3101, so that the upper insulating sleeve 313 can move vertically on the first mounting pin 315. One end of the lower electrode cylinder 314 of coil A is connected to coil A of magnet 311, and the other end is electrically connected to coil B of coil B through electrical connection plate 34.

[0048] The B coil 32 includes a B magnet coil 321, an upper electrode cylinder 322, an upper insulating sleeve 323, a lower electrode cylinder 324, and a second mounting pin 325. The insulating sleeve of the B magnet coil 321 is located outside the A magnet coil 311. The top of the B magnet coil 321 is connected to the bottom of the upper insulating sleeve 323 via the upper electrode cylinder 322. The C coil 3 is electrically connected to the upper electrode cylinder 322 via a conductive flexible connector. A plurality of second mounting holes 3201 are provided on the top of the upper insulating sleeve 323. A second mounting pin 325 is provided in each of the second mounting holes 3201. The end of the second mounting pin 325 away from the B magnet coil 321 is connected to the container top cover 12. There is a gap between the second mounting pin 325 and the bottom of the second mounting hole 3201, allowing the upper insulating sleeve 323 to move vertically on the second mounting pin 325. One end of the lower electrode cylinder 324 of coil B is connected to the B magnet coil 321, and the other end is electrically connected to the lower electrode cylinder 314 of coil A through the electrical connection plate 34.

[0049] For further details, please refer to [link / reference]. Figure 9The electrical connection plate 34 is connected to the container bottom cover 13 through the anti-rotation structure 35. The anti-rotation structure 35 includes an anti-rotation insulating plate 351, an anti-rotation sleeve 352, an anti-rotation ring 353, and a positioning pin 354. The anti-rotation sleeve 352 is connected to the electrical connection plate 34 through the anti-rotation insulating plate 351. The bottom of the anti-rotation sleeve 352 is fitted with an anti-rotation ring 353. The anti-rotation ring 353 is fixedly connected to the container bottom cover 13 by bolts. The inner wall of the anti-rotation ring 353 is provided with a plurality of vertical sliding grooves 3531. The anti-rotation sleeve 352 is provided with positioning pins 354 in the same position and number as the vertical sliding grooves 3531. The end of the positioning pin 354 away from the anti-rotation sleeve 352 extends into the sliding groove 3531, so that the positioning pin 354 can move along the axial direction of the device within the vertical sliding groove 3531.

[0050] In this embodiment, coil C 33 is fixed to the inner wall of cylinder 11, ensuring that the mechanical magnetic plane of coil C 33 remains stationary during device operation. This mechanical magnetic plane serves as the actual magnetic plane for the fatigue-resistant water-cooled magnet device. Coils A 31 and B 32 are connected via electrical connection plate 34, and their actual magnetic planes are the same. Since the actual magnetic planes of coils A 31 and B 32 cannot be determined, existing anti-rotation adjustment structures cannot adjust their actual magnetic planes. However, the difference between the actual magnetic plane and the mechanical magnetic plane is generally within ±2mm. Therefore, during the installation of coils A 31 and B 32 and their upper and lower connecting parts, the mechanical magnetic planes of coils A 31 and B 32 are set 2mm lower than that of coil C 33, ensuring that the actual magnetic plane of coil C 33 is higher than that of coils A 31 and B 32. When the water-cooled magnet device operates, the electromagnetic force pulls coils A 31 and B 32 upwards to align with the actual magnetic plane of coil C 33.

[0051] During this process, the lower parts of coil A 31 and coil B 32 can move upward along the axial direction of the device through the sliding groove 3531 via the positioning pin 354. The sliding groove 3531 also limits the circumferential rotation of the positioning pin 354, thereby preventing coil A 31 and coil B 32 from rotating. For the upper parts of coil A 31 and coil B 32, due to the gap between the first mounting pin 315 and the bottom of the first mounting hole 3101 and the gap between the second mounting pin 325 and the bottom of the second mounting hole 3201, the insulating sleeve 313 on coil A can move upward on the first mounting pin 315 and the insulating sleeve 323 on coil B can move upward on the second mounting pin 325. This allows coil A 31 and coil B 32 to move upward along the axial direction of the central tube assembly 2, ensuring that coil A 31 and coil B 32 are pulled upward and coincide with the actual magnetic plane of coil C 33. This reduces the electromagnetic force generated between the coils, thereby reducing the fatigue speed of the coils and greatly improving the life of the water-cooled magnet device.

[0052] For further details, please refer to [link / reference]. Figure 7Electrical connection 15 is electrically connected to the upper electrode cylinder 312 of coil A through transition soft electrical connector 36. When coil A moves upward, transition soft electrical connector 36 will undergo deflection deformation to achieve the upward movement of coil A 31.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] The above embodiments are merely illustrative of implementation methods of the invention. The scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A fatigue-resistant water-cooled magnet apparatus, characterized by: It includes a container assembly, a central tube assembly and a magnet coil assembly disposed inside the container assembly. The central tube assembly is located at the center of the container assembly, and the magnet coil assembly is sleeved on the outside of the central tube assembly. The magnet coil assembly includes multiple coils that are radially connected in sequence. The two innermost coils are sleeved outside the central tube assembly and can move along the axial direction of the central tube assembly inside the container assembly. The remaining coils are fixed inside the container assembly.

2. A fatigue-resistant water-cooled magnet arrangement according to claim 1, characterized in that: The magnet coil assembly includes three coils, A, B and C, which are radially connected in series. Coil A is sleeved outside the central tube assembly. Coil A and coil B are movable inside the container assembly along the axial direction of the central tube assembly. Coil C is fixed inside the container assembly. Coil C is electrically connected to coil B through a conductive flexible connector. Coil B is electrically connected to coil A through an electrical connection plate.

3. A fatigue-resistant water-cooled magnet device according to claim 2, characterized in that: The top of coil A and coil B are respectively provided with a first mounting hole and a second mounting hole. The first mounting hole and the second mounting hole are respectively provided with a first mounting pin and a second mounting pin. The ends of the first mounting pin and the second mounting pin away from coil A and coil B are connected to the top of the container assembly. The bottom of the first mounting pin and the second mounting pin are respectively separated from the bottom of the first mounting hole and the second mounting hole. The electrical connection plate is connected to the bottom of the container assembly through an anti-rotation structure. The anti-rotation structure includes an anti-rotation insulating plate, an anti-rotation sleeve, an anti-rotation ring, and a positioning pin. The anti-rotation sleeve is connected to the electrical connection plate through the anti-rotation insulating plate. An anti-rotation ring is fitted at the bottom of the anti-rotation sleeve and is connected to the bottom of the container assembly. Multiple vertical sliding grooves are provided circumferentially on the inner wall of the anti-rotation ring. The anti-rotation sleeve is provided with positioning pins in the same position and number as the vertical sliding grooves. The end of the positioning pin away from the anti-rotation sleeve extends into the sliding groove.

4. A fatigue-resistant water-cooled magnet device according to claim 1, characterized in that: The container assembly includes a cylindrical wall, a container top cover, a container bottom cover, support legs, and electrical connections. The top and bottom ends of the cylindrical wall are connected to the container top cover and the container bottom cover, respectively. The central tube assembly and the magnet coil assembly are located inside the cylindrical wall, and multiple electrical connections penetrate the cylindrical wall and are electrically connected to the magnet coil assembly.

5. A fatigue-resistant water-cooled magnet device according to claim 1, characterized in that: The central tube assembly includes a tube body, a cap, an insulating positioning cylinder, a superconducting coil, a stop coil, and a sample rod. The tube body passes through the innermost coil of the magnet coil assembly and is fixed between the top and bottom of the container assembly. The bottom of the tube body is sealed and the top is open. The cap is placed on the top of the tube body to seal the top opening. A vacuum chamber is provided on the tube body. An insulating positioning cylinder is provided in the inner cavity of the tube body. The superconducting coil and the stop coil are coaxially arranged on the insulating positioning cylinder. The stop coil is sleeved outside the superconducting coil and there is a gap between them. The sample end of the sample rod passes through the cap and is sealed at the center of the superconducting coil.

6. A fatigue-resistant water-cooled magnet device according to claim 5, characterized in that: There is a gap between the inner wall of the tube and the insulating positioning cylinder and the outer wall of the resistive coil, and there is a gap between the top end face of the insulating positioning cylinder and the cover, which causes the gap between the inner wall of the tube and the insulating positioning cylinder to communicate with the inner cavity of the insulating positioning cylinder.

7. A fatigue-resistant water-cooled magnet device according to claim 5, characterized in that: The insulating positioning cylinder includes an upper insulating positioning cylinder and a lower insulating positioning cylinder. The top of the upper insulating positioning cylinder is connected to the cover, and the bottom of the lower insulating positioning cylinder abuts against the bottom of the tube body. The superconducting coil and the resistive coil are coaxially arranged between the bottom of the upper insulating positioning cylinder and the top of the lower insulating positioning cylinder.

8. A fatigue-resistant water-cooled magnet device according to claim 7, characterized in that: The bottom end face of the upper insulating positioning cylinder is a stepped surface, which includes a first step, a second step, and a vertical step. The height of the first step is higher than that of the second step. The vertical step is located between the first and second steps. The top end face and outer side of the superconducting coil are respectively attached to the first step and the vertical step. A positioning groove is provided on the inner wall of the top of the resistive coil. The bottom of the positioning groove is attached to the second step, and the wall of the positioning groove is attached to the outer wall of the bottom of the upper insulating positioning cylinder.

9. A fatigue-resistant water-cooled magnet device according to claim 7, characterized in that: The top end face of the lower insulating positioning cylinder is provided with a lower positioning groove, the bottom of the superconducting coil is engaged in the lower positioning groove, and the bottom end face of the resistive coil is attached to the top end face of the lower insulating positioning cylinder.

10. A fatigue-resistant water-cooled magnet device according to claim 7, characterized in that: The bottom end face of the upper insulating positioning cylinder is also provided with multiple upper radial grooves, and the top end face of the lower insulating positioning cylinder is also provided with multiple lower radial grooves. Both the upper and lower radial grooves are connected to the gap between the shear coil and the superconducting coil.

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