Pluggable binary current lead copper section structure of superconducting magnet

Abstract

The utility model discloses a pluggable binary current lead copper section structure of a superconducting magnet, which comprises a sealed cylinder, a current lead rod and a conduction component, the sealed cylinder is fixedly arranged on the outer wall of superconducting magnet equipment, and the current lead rod can reciprocate along the axial direction of the current lead rod relative to the sealed cylinder. A combination part is arranged on the outer circumferential wall of the current lead rod, a limiting part is arranged on the inner circumferential wall of the sealing cylinder, it is ensured that the current lead rod can stably stay at the combination position, the conduction part is used for conducting electric energy transmitted by the current lead rod to a to-be-excited object, and after excitation is completed, the current lead rod is made to move to the separation position; therefore, the current lead rod is blocked as a conduction heat leakage channel between the room temperature and the superconducting magnet low-temperature environment (inner-layer chamber), the cooling effect of the superconducting magnet can stably reach the preset target operation temperature, and the superconducting magnet is always in a stable superconducting state.

Description

Technical Field

[0001] This utility model relates to the field of superconducting magnet technology, and in particular to a pluggable binary current lead copper segment structure for superconducting magnets. Background Technology

[0002] Superconducting magnet devices are widely used in energy, medical, scientific research and other fields. Most superconducting magnet devices require the superconducting magnet to be placed in a low temperature environment to maintain the superconducting state. Therefore, the cavity containing the superconducting magnet needs to be filled with a cooling medium to ensure that the superconducting magnet can be stably kept in the superconducting state and maintain the extremely low temperature conditions required for its normal operation.

[0003] Before a superconducting magnet can be put into normal use, it is necessary to establish and maintain the magnetic field through excitation. Excitation refers to the process of passing a current of a specific intensity into the superconducting coil inside the superconducting magnet to generate a magnetic field of the required intensity and direction and to maintain the stable existence of the magnetic field. The most important thing in the excitation process is to achieve stable power transmission between the external power source and the internal superconducting coil.

[0004] In the actual excitation operation of superconducting magnets, existing technologies all employ manual plugging and unplugging to connect the external current leads to the fixed connectors inside the magnet, thereby establishing a closed conductive circuit between the external power supply and the superconducting coil. The currently used current leads employ an integrated direct-connection structure. After the magnet excitation is complete, this current lead remains connected to both the low-temperature and room-temperature environments. Because the copper section of the current lead needs to meet the requirements of efficient power transmission, its material is typically high-conductivity copper. However, copper itself also has good thermal conductivity. In practical applications, this portion leads to excessive heat leakage, causing the overall cooling effect of the superconducting magnet to fail to reach the preset target operating temperature. This not only interferes with the normal excitation process of the superconducting magnet but also seriously affects its operational stability and reliability, and may even shorten its service life. Utility Model Content

[0005] The purpose of this invention is to solve the technical problem in the prior art where the current lead adopts an integrated direct-connection structure. After the magnet is energized, the current lead is still connected to the low-temperature environment and the room temperature environment. This part conducts excessive heat leakage, which will interfere with the normal energization process of the superconducting magnet and seriously affect the operation stability and reliability of the superconducting magnet.

[0006] To solve the above-mentioned technical problems, the present invention discloses a superconducting magnet pluggable binary current lead copper segment structure, including a sealed cylinder, a current lead rod and a conductive component.

[0007] The sealed cylinder is located on the outer wall of the superconducting magnet device and is connected to the outer cavity of the superconducting magnet device.

[0008] The current lead rod is installed inside the sealed cylinder and extends into the outer cavity of the superconducting magnet device. The end of the current lead rod away from the outer cavity is connected to the external circuit. The current lead rod can move spirally around its axis relative to the sealed cylinder. A joint is provided on the outer peripheral wall of the current lead rod, and a limiting part is provided on the inner peripheral wall of the sealed cylinder to cooperate with the joint. The limiting part can restrict the axial movement of the current lead rod.

[0009] The conductive component is located on the inner wall of the superconducting magnet device at a position corresponding to the current lead rod, and the conductive component is connected to the object to be excited in the inner cavity of the superconducting magnet device.

[0010] The limiting part can limit the current lead rod to the engagement position and the separation position. In the engagement position, the end of the current lead rod extending into the outer cavity is engaged with the conductive component, and in the separation position, the end of the current lead rod extending into the outer cavity is separated from the conductive component.

[0011] Using the above technical solution, the sealing cylinder is fixedly installed on the outer wall of the superconducting magnet equipment, and the internal channel of the sealing cylinder is connected to the outer cavity of the superconducting magnet equipment, providing installation support and sealing protection for the current lead rod, preventing leakage of the cooling medium in the outer cavity and the intrusion of external heat. The current lead rod can reciprocate relative to the sealing cylinder along its own axis to achieve engagement and disengagement with the conductive component. A joint is provided on the outer peripheral wall of the current lead rod, and a corresponding limiting part adapted to the joint is provided on the inner peripheral wall of the sealing cylinder. The limiting part can precisely limit the axial movement stroke of the current lead rod, ensuring that the current lead rod can stably stay in a preset position (such as the engagement position and the disengagement position). The conductive component is used to conduct the electrical energy transmitted by the current lead rod to the object to be excited, providing an electrical energy transmission path for the excitation operation.

[0012] Therefore, the pluggable binary current lead copper segment structure of the superconducting magnet provided in this embodiment realizes the separable connection between the current lead rod and the conductive component. During the excitation operation of the superconducting magnet, the current lead rod is in the engaged position, and the electrical energy of the external circuit is transmitted to the object to be energized through the current lead rod and the conductive component. After the excitation is completed, the operable current lead rod can be moved axially along the sealed cylinder to switch it from the engaged position to the disengaged position, thereby separating the current lead rod from the conductive component. This blocks the current lead rod from acting as a heat leakage channel between room temperature and the low-temperature environment (inner chamber) of the superconducting magnet, ensuring that the cooling effect of the superconducting magnet can stably reach the preset target operating temperature. This keeps the superconducting magnet in a stable superconducting state, improves the stability and reliability of the superconducting magnet during operation, and extends the service life of the superconducting magnet.

[0013] Furthermore, the current lead rod moves spirally around its axis relative to the sealed cylinder, which allows the current lead rod to switch slowly and smoothly between the two positions. This reduces the impact caused by the sudden engagement between the current lead rod and the conductive component when the current lead rod moves to the engagement position, and reduces the wear caused when the current lead rod and the conductive component are connected.

[0014] In addition, operators can disconnect and close the current lead rod using external equipment of the superconducting magnet without disrupting the vacuum operating environment of the superconducting magnet, thus enabling rapid adjustment and installation of the current lead rod, and providing excellent ease of operation and flexibility.

[0015] The present invention also discloses a pluggable binary current lead copper segment structure for a superconducting magnet. The sealed cylinder includes a cylinder body and a first flange and a second flange disposed at both ends of the cylinder body. Each flange surrounds and protrudes from the outer circumferential surface of the cylinder body. The first flange is fixedly connected to the outer wall of the superconducting magnet device.

[0016] The limiting part is configured as follows: a limiting flange fixedly installed on the second flange part, the limiting flange having a connecting hole, and a limiting internal thread provided on the inner peripheral wall of the connecting hole; the connecting part is configured as follows: an external thread provided on part of the outer peripheral wall of the current lead rod, the threaded section of the current lead rod with the external thread passing through the connecting hole, and the external thread engaging with the limiting internal thread.

[0017] By adopting the above technical solution, the first flange increases the contact area between the sealing cylinder and the outer wall of the magnet, making the fixed connection between the sealing cylinder and the outer wall more secure and preventing the sealing cylinder from shifting or loosening due to vibration or pressure changes. It also enhances the sealing performance of the outer chamber, reducing cooling medium leakage and external heat intrusion. Furthermore, the limiting flange on the second flange engages with the external thread of the threaded section of the current lead rod through a limiting internal thread. This achieves precise guidance for the axial helical movement of the current lead rod and also provides a locking and limiting effect through thread engagement, improving the positioning stability of the current lead rod at the engagement and disengagement positions and preventing positional deviation.

[0018] The present invention also discloses a pluggable binary current lead copper segment structure for a superconducting magnet. The current lead rod further includes a smooth segment located inside the sealed cylinder. The smooth segment is located on the side of the threaded segment near the inner wall of the superconducting magnet device.

[0019] A magnetic fluid sealing component is provided between the smooth section and the corresponding inner wall surface of the sealing cylinder.

[0020] Using the above technical solution, the smooth section on the current lead rod is engaged with the corresponding inner wall surface of the sealing cylinder through a magnetic fluid sealing component. The magnetic fluid sealing component has excellent dynamic sealing characteristics. Even when the current lead rod moves spirally around its axis and switches between the engagement and disengagement positions, it can always ensure reliable sealing between the sealing cylinder and the current lead rod, preventing ambient room air and impurities from entering the interior of the sealing cylinder and the outer cavity of the superconducting magnet through the gap between them. At the same time, it effectively prevents the leakage of cooling medium in the outer cavity, thus ensuring the stability of the low-temperature operating environment of the superconducting magnet and avoiding the problem of increased heat leakage caused by cooling medium loss and external heat intrusion.

[0021] Furthermore, the current lead rod engages with the magnetic fluid sealing component through a smooth section. The smooth outer circumference reduces wear on the magnetic fluid sealing component, extends its service life, and ensures smooth spiral movement of the current lead rod, avoiding movement jamming and component wear caused by excessive friction between the sealing component and the lead rod.

[0022] The present invention also discloses a superconducting magnet pluggable binary current lead copper segment structure. The magnetohydrodynamic sealing component includes a pair of bearings spaced apart along the axial direction of the current lead rod, a pair of magnetic pole rings and a permanent magnet disposed between the pair of bearings. The pair of magnetic pole rings are sleeved on the smooth segment, and the permanent magnet is located between the pair of magnetic pole rings. Magnetohydrodynamic fluid is also filled between the pair of magnetic pole rings and on the side of the permanent magnet closer to the smooth segment.

[0023] A retaining ring is also provided on the inner circumferential surface of the cylinder body at the part where a pair of bearings are facing away from each other.

[0024] Using the above technical solution, the permanent magnet can generate a stable magnetic field, adsorbing the magnetofluid between the magnetic pole ring and the smooth section to form a uniform and dense magnetofluid sealing film, achieving zero-leakage sealing, blocking the intrusion of external heat and impurities and the leakage of cooling medium, and greatly improving the sealing reliability. In addition, a pair of bearings can provide precise support and guidance for the current lead rod, and together with the smooth section, further ensure the smoothness of the spiral movement of the current lead rod, reduce shaking and friction during the movement, avoid wear of sealing components, protect the current lead rod itself, and extend the overall service life of the structure.

[0025] The present invention also discloses a superconducting magnet pluggable binary current lead copper segment structure. One end of the current lead rod extending into the outer cavity is provided with a lead socket. The end of the lead socket away from the current lead rod is provided with a spherical protrusion. The conductive component is provided with a lead shell. The side of the lead shell facing the lead socket is provided with a recess that is adapted to and can be joined with the protrusion.

[0026] The surfaces of the protrusions and / or recesses are provided with an electrical connection enhancement coating.

[0027] By adopting the above technical solution, the spherical protrusion and the matching recess have good alignment capability. Even if there is a slight coaxiality deviation between the current lead rod and the conductive component, it is still ensured that the two can fit tightly when they are connected, avoiding poor contact due to alignment deviation and ensuring stable power transmission. In addition, the spherical protrusion and the recess have a larger contact area and more uniform contact, which can effectively reduce contact resistance, reduce heat loss during power transmission, and avoid local overheating and damage to components.

[0028] In addition, the electrical connection enhancement coating can further reduce contact resistance, improve conductivity and electrical connection stability, and enhance the wear resistance and oxidation resistance of the contact surface. This prevents wear and oxidation of the contact surface caused by long-term docking and separation operations, ensuring long-term stable electrical connection performance and extending the service life of the docking components.

[0029] The present invention also discloses a superconducting magnet pluggable binary current lead copper segment structure, wherein a flexible connection part is provided between the lead mother shell and the inner wall, the outer periphery of the flexible connection part is fixedly connected to the inner wall, and the inner periphery is fixedly connected to the lead mother shell.

[0030] The flexible connection part is set as a metal mesh formed by woven metal wires, or a flexible metal sheet.

[0031] By adopting the above technical solution, the flexible connection part can achieve flexible fixation between the lead wire shell and the inner wall of the superconducting magnet equipment, compensate for the installation deviation and temperature deformation deviation between the lead wire shell and the inner wall, avoid the thermal contraction caused by the ultra-low temperature operation of the superconducting magnet, which would lead to deformation and damage of the lead wire shell, and at the same time buffer the impact of equipment vibration on the lead wire shell and protect the conductive components.

[0032] Furthermore, the flexible connection part has a certain degree of extension and offset capability, which can be combined with the alignment function of the spherical convex and concave mating structure to further improve the docking accuracy and fit between the current lead rod and the lead shell, ensuring stable electrical connection.

[0033] The present invention also discloses a pluggable binary current lead copper segment structure for a superconducting magnet. A connecting segment is provided on the part of the current lead rod that is away from the outer cavity and extends out of the sealed cylinder. A connecting block is fixedly connected to the connecting segment, and the connecting block is used to electrically connect to the external circuit.

[0034] By adopting the above technical solution, the connecting block facilitates the quick and stable connection between the external circuit and the current lead rod, improving the convenience and reliability of the electrical connection.

[0035] The present invention also discloses a pluggable binary current lead copper segment structure for a superconducting magnet, which further includes a lead support seat disposed in the inner cavity of the superconducting magnet device. One end of the lead support seat is fixed and electrically connected to the conductive component, and the other end is fixed and electrically connected to the object to be excited.

[0036] By adopting the above technical solution, the lead support seat can achieve precise docking and power transmission between the conductive component and the object to be excited. In addition, the lead support seat can provide precise support and fixation for the conductive component, ensuring that the conductive component is stable under extreme conditions such as extremely low temperature and vibration, and avoiding deviation in docking with the current lead rod due to displacement of the conductive component.

[0037] The embodiments of this utility model also disclose a pluggable binary current lead copper segment structure for a superconducting magnet, wherein the outer wall of the superconducting magnet device is configured as a Dewar and the inner wall of the superconducting magnet device is configured as a cold shield.

[0038] By adopting the above technical solution, when the current lead rod is in the separated position after excitation, the Dewar and the cold shield themselves have a certain heat insulation effect, which greatly reduces the overall heat loss of the equipment, avoids excessive heat loss leading to excessive load on the cooling system, ensures that the overall cooling effect of the equipment reaches the preset target, and at the same time reduces the consumption of cooling medium and energy, and reduces the operating cost of the equipment.

[0039] The beneficial effects of this utility model are as follows:

[0040] This utility model discloses a pluggable binary current lead copper segment structure for a superconducting magnet, including a sealed cylinder, a current lead rod, and a conductive component. The sealed cylinder is fixedly mounted on the outer wall of the superconducting magnet device, and its internal channel is connected to the outer cavity of the superconducting magnet device, providing installation support and sealing protection for the current lead rod. The current lead rod can reciprocate relative to the sealed cylinder along its own axial direction. A connecting part is provided on the outer peripheral wall of the current lead rod, and a corresponding limiting part adapted to the connecting part is provided on the inner peripheral wall of the sealed cylinder. The limiting part can precisely limit the axial movement stroke of the current lead rod, ensuring the stability of the current lead rod. When in the engaged position, the conductive component transmits the electrical energy from the current lead rod to the object to be energized, providing an electrical energy transmission path for the energizing operation. After energizing is completed, the operable current lead rod can be moved axially along the sealed cylinder to switch from the engaged position to the disengaged position, thus separating the current lead rod from the conductive component. This blocks the current lead rod from acting as a heat conduction channel between room temperature and the low-temperature environment (inner chamber) of the superconducting magnet, ensuring that the cooling effect of the superconducting magnet can stably reach the preset target operating temperature. This keeps the superconducting magnet in a stable superconducting state, improving the stability and reliability of the superconducting magnet during operation and extending its service life. Attached Figure Description

[0041] Figure 1 A cross-sectional schematic diagram of the copper segment structure of the pluggable binary current lead of the superconducting magnet provided in an embodiment of this utility model.

[0042] Figure 2 A cross-sectional schematic diagram of the current lead rod of the superconducting magnet pluggable binary current lead copper segment structure provided in this embodiment of the utility model;

[0043] Figure 3 A partial cross-sectional schematic diagram of a magnetohydrodynamic sealing component with a superconducting magnet pluggable binary current lead copper segment structure provided in an embodiment of this utility model;

[0044] Figure 4 This is a partial cross-sectional schematic diagram of the lead socket and conductive component of the superconducting magnet pluggable binary current lead copper segment structure provided in the embodiment of this utility model.

[0045] Explanation of reference numerals in the attached figures:

[0046] 10. Superconducting magnet with pluggable binary current lead copper segment structure;

[0047] 100. Sealed cylinder; 101. Limiting part;

[0048] 110. Cylinder body; 120. First flange; 130. Second flange; 140. Limiting flange;

[0049] 200. Current lead rod; 201. Joint;

[0050] 210. Threaded section; 220. Smooth section; 230. Lead wire socket; 231. Protrusion; 240. Connecting section; 241. Connecting block;

[0051] 300. Conductive component; 310. Lead wire housing; 311. Recessed portion; 320. Flexible connection portion;

[0052] 400. Magnetohydrodynamic sealing components;

[0053] 410. Bearing; 420. Magnetic pole ring; 430. Permanent magnet; 440. Magnetorheological fluid; 450. Retaining ring;

[0054] 500. Lead wire support base;

[0055] 20. Outer wall; 30. Inner wall; 40. Object to be energized. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0057] like Figure 1As shown, this embodiment discloses a superconducting magnet pluggable binary current lead copper segment structure 10, including a sealed cylinder 100, a current lead rod 200 and a conductive component 300, wherein the current lead rod 200 is made of copper with good conductivity.

[0058] Specifically, the sealing cylinder 100 is disposed on the outer wall 20 of the superconducting magnet device and is connected to the outer cavity of the superconducting magnet device. The sealing cylinder 100 is fixedly disposed on the outer wall 20 of the superconducting magnet device, and the internal channel of the sealing cylinder 100 is connected to the outer cavity of the superconducting magnet device, providing installation support and sealing protection for the current lead rod 200, and preventing the leakage of cooling medium in the outer cavity and the intrusion of external heat.

[0059] The current lead rod 200 is disposed inside the sealed cylinder 100 and extends into the outer cavity of the superconducting magnet device. The end of the current lead rod 200 away from the outer cavity is connected to an external circuit. The current lead rod 200 can move axially relative to the sealed cylinder 100. A joint portion 201 is provided on the outer peripheral wall of the current lead rod 200. A limiting portion 101 that cooperates with the joint portion 201 is provided on the inner peripheral wall of the sealed cylinder 100. The limiting portion 101 can restrict the axial movement of the current lead rod 200.

[0060] The limiting part 101 can limit the current lead rod 200 to the combined position and the separated position. In the combined position, the end of the current lead rod 200 extending into the outer cavity is combined with the conductive component 300, and in the separated position, the end of the current lead rod 200 extending into the outer cavity is separated from the conductive component 300.

[0061] The conductive component 300 is disposed on the inner wall 30 of the superconducting magnet device at a position corresponding to the current lead rod 200. The conductive component 300 is connected to the object to be excited 40 in the inner cavity of the superconducting magnet device. When the end of the current lead rod 200 in the combined position extends into the outer cavity and is combined with the conductive component 300, the conductive component 300 is used to conduct the electrical energy transmitted by the current lead rod 200 to the object to be excited 40, providing an electrical energy transmission path for the excitation operation.

[0062] Therefore, the pluggable binary current lead copper segment structure 10 for superconducting magnets provided in this embodiment realizes the separable connection between the current lead rod 200 and the conductive component 300. During the excitation operation of the superconducting magnet, the current lead rod 200 is in the engaged position, and the electrical energy of the external circuit is transmitted to the object to be energized 40 through the current lead rod 200 and the conductive component 300. After the excitation is completed, the operable current lead rod 200 can be moved axially along the sealed cylinder 100 to switch it from the engaged position to the disengaged position, so that the current lead rod 200 is separated from the conductive component 300. This blocks the current lead rod 200 from acting as a heat leakage channel between room temperature and the low temperature environment (inner chamber) of the superconducting magnet, ensuring that the cooling effect of the superconducting magnet can stably reach the preset target operating temperature, so that the superconducting magnet is always in a stable superconducting state, improving the stability and reliability of the superconducting magnet during operation, and extending the service life of the superconducting magnet.

[0063] Furthermore, operators can perform the opening and closing operations of the current lead rod 200 on external equipment of the superconducting magnet without disrupting the vacuum operating environment of the superconducting magnet. This enables rapid adjustment and installation of the current lead rod 200, providing excellent ease of operation and flexibility. It should be noted that operators can manually adjust the position of the current lead rod 200 using tools, or they can set up a drive component (such as a motor) to drive the current lead rod 200 to achieve position switching. This embodiment does not specifically limit this.

[0064] In this embodiment, the current lead rod 200 can be helically moved relative to the sealing cylinder 100 about its axis, so that the current lead rod 200 switches between the engaged position and the disengaged position.

[0065] Specifically, the current lead rod 200 moves spirally relative to the sealing cylinder 100 around its axis, which can realize the slow and smooth switching of the current lead rod 200 between two positions, reduce the impact caused by the sudden engagement between the current lead rod 200 and the conductive component 300 when it moves to the engagement position, and reduce the wear caused when the current lead rod 200 and the conductive component 300 are connected.

[0066] Of course, the current lead rod 200 can also be translated axially relative to the sealed cylinder 100, and this embodiment does not limit this to a single property.

[0067] The following is a detailed description of the mating structure between the sealing cylinder 100 and the current lead rod 200.

[0068] like Figure 1As shown, in this embodiment, the sealing cylinder 100 includes a cylinder body 110 and a first flange portion 120 and a second flange portion 130 disposed at both ends of the cylinder body 110. Each flange portion surrounds and protrudes from the outer peripheral surface of the cylinder body 110. The first flange portion 120 is fixedly connected to the outer wall 20 of the superconducting magnet device, specifically by bolt connection.

[0069] The limiting part 101 is configured as: a limiting flange 140 fixedly disposed on the second flange part 130, the limiting flange 140 having a connecting hole, and a limiting internal thread provided on the inner peripheral wall of the connecting hole; the connecting part 201 is configured as: an external thread provided on part of the outer peripheral wall of the current lead rod 200, the threaded section 210 of the current lead rod 200 having an external thread passing through the connecting hole, and the external thread engaging with the limiting internal thread.

[0070] In this embodiment, the first flange portion 120 increases the contact area between the sealing cylinder 100 and the outer wall 20 of the magnet, making the fixed connection between the sealing cylinder 100 and the outer wall 20 more secure. This prevents the sealing cylinder 100 from shifting or loosening due to vibration or pressure changes, while also enhancing the sealing performance of the outer chamber and reducing cooling medium leakage and external heat intrusion. Furthermore, the limiting flange 140 on the second flange portion 130 engages with the external thread of the threaded section 210 of the current lead rod 200 through a limiting internal thread. This achieves precise guidance for the axial helical movement of the current lead rod 200 and also provides a locking and limiting effect through thread engagement, improving the positioning stability of the current lead rod 200 in the engagement and disengagement positions and preventing positional deviation.

[0071] Of course, the connection portion 201 of the current lead rod 200 and the limiting portion 101 of the sealing cylinder 100 are not limited to the structure in the above embodiment. In another embodiment, the connection portion 201 on the current lead rod 200 is set as a radially protruding connection protrusion on the outer peripheral wall, and the limiting portion 101 of the sealing cylinder 100 is set as a limiting groove extending axially spirally on the inner wall 30 surface of the cylinder body 110. Furthermore, the two ends of the limiting groove respectively form extension portions extending circumferentially along the cylinder body 110. When the current... When the current lead rod 200 moves helically in the axial direction relative to the sealing cylinder 100, the engaging protrusion slides correspondingly in the limiting groove of the cylinder body 110. Taking the current lead rod 200 in the engaged position, with the engaging protrusion located at the end of the limiting groove near the outer wall 20 as an example, rotating the current lead rod 200 causes the engaging protrusion to slide into the corresponding extension of the limiting groove, thereby limiting the axial wobbling of the current lead rod 200 during excitation and ensuring a stable connection between the current lead rod 200 and the conductive component 300. Similarly, when the current lead rod 200 is in the disengaged position, the engaging protrusion is located in the extension of the limiting groove at the end away from the outer wall 20.

[0072] It should be noted that if the current lead rod 200 is axially translated relative to the sealing cylinder 100, the limiting groove can be changed to extend along the axial direction of the current lead rod 200.

[0073] Furthermore, such as Figure 1 and Figure 2 As shown, in order to ensure the sealing between the current lead rod 200 and the sealing cylinder 100 when the current lead rod 200 is switching positions, the current lead rod 200 also includes a smooth section 220 located inside the sealing cylinder 100. The smooth section 220 is located on the side of the threaded section 210 near the inner wall 30 of the superconducting magnet device. A magnetohydrodynamic sealing component 400 is provided between the smooth section 220 and the corresponding inner wall 30 surface of the sealing cylinder 100.

[0074] In this embodiment, the smooth section 220 on the current lead rod 200 is engaged with the corresponding inner wall 30 of the sealing cylinder 100 through the magnetic fluid sealing component 400. The magnetic fluid sealing component 400 has excellent dynamic sealing characteristics. Even when the current lead rod 200 moves spirally around its axis and switches between the engagement and disengagement positions, it can always ensure reliable sealing between the sealing cylinder 100 and the current lead rod 200. This prevents ambient room temperature air and impurities from entering the interior of the sealing cylinder 100 and the outer cavity of the superconducting magnet through the gap between the two. At the same time, it effectively prevents the leakage of cooling medium in the outer cavity, thus ensuring the stability of the low-temperature operating environment of the superconducting magnet and avoiding the problem of increased heat leakage caused by cooling medium loss and external heat intrusion.

[0075] Furthermore, the current lead rod 200 cooperates with the magnetic fluid sealing component 400 through the smooth section 220. The smooth outer peripheral surface can reduce the wear of the magnetic fluid sealing component 400, extend the service life of the sealing component, and at the same time ensure the smoothness of the spiral movement of the current lead rod 200, avoiding movement jamming and component wear caused by excessive friction between the sealing component and the lead rod.

[0076] Specifically, such as Figure 3 As shown, the magnetohydrodynamic sealing component 400 includes a pair of bearings 410 spaced apart along the axial direction of the current lead rod 200, a pair of magnetic pole rings 420 and a permanent magnet 430 disposed between the pair of bearings 410. The pair of magnetic pole rings 420 are sleeved on the smooth section 220, and the permanent magnet 430 is located between the pair of magnetic pole rings 420. The space between the pair of magnetic pole rings 420 and the side of the permanent magnet 430 near the smooth section 220 is also filled with magnetohydrodynamic fluid 440.

[0077] A retaining ring 450 is also provided on the inner circumferential surface of the cylinder body 110 at the part where a pair of bearings 410 are facing away from each other.

[0078] In this embodiment, the permanent magnet 430 is made of a permanent magnet material (such as neodymium iron boron permanent magnet, samarium cobalt permanent magnet, etc.) that is resistant to extremely low temperatures, has high magnetic field strength, and stable magnetic properties. It can generate a stable magnetic field. The pair of magnetic pole rings 420 are usually made of soft magnetic materials (such as pure iron, permalloy, etc.) with high magnetic permeability and resistance to extremely low temperatures. They conduct the magnetic field generated by the permanent magnet 430 and concentrate the magnetic field to the surface of the smooth section 220 of the current lead rod 200. A uniform magnetic field gradient is formed between the magnetic pole rings 420 and the smooth section 220, thereby firmly adsorbing the magnetic fluid 440 into the gap between the two to form a dense sealing film, achieving zero leakage sealing, blocking the intrusion of external heat and impurities and the leakage of cooling medium, and greatly improving the sealing reliability. The magnetic fluid 440 is usually composed of a base liquid (synthetic oil, silicone oil, etc. suitable for extremely low temperatures), magnetic particles (nanoscale soft magnetic particles, such as iron oxide particles) and surfactants, which have both the fluidity of liquids and the magnetism of solids.

[0079] Furthermore, a pair of bearings 410 can provide precise support and guidance for the current lead rod 200. Together with the smooth section 220, they further ensure the smoothness of the spiral movement of the current lead rod 200, reduce shaking and friction during movement, avoid wear of sealing components, protect the current lead rod 200 itself, and extend the overall service life of the structure.

[0080] Of course, a sealing ring structure composed of low-temperature resistant hard alloy and polytetrafluoroethylene (or low-temperature ceramic) can also be provided between the smooth section 220 and the corresponding inner wall 30 of the sealing cylinder 100. With the help of low-temperature lubricating grease, a gapless seal can be achieved by the sealing surfaces fitting together. Alternatively, an annular labyrinth groove can be machined on the outer circumferential surface of the smooth section 220, and a boss can be machined at the corresponding position on the inner wall 30 of the sealing cylinder 100 to form a labyrinth gap. No additional sealing components are required. The "labyrinth gap throttling effect" is used to block the intrusion of external air / heat and the leakage of internal cooling materials. This embodiment does not limit this to a single method.

[0081] The following is a detailed description of the mating structure between the current lead rod 200 and the conductive component 300.

[0082] In this embodiment, as Figure 1 , Figure 2 and Figure 4 As shown, a lead socket 230 is provided at one end of the current lead rod 200 that extends into the outer cavity. The end of the lead socket 230 away from the current lead rod 200 is provided as a spherical protrusion 231. The conductive component 300 is provided as a lead housing 310. A recess 311 that is adapted to and can be joined with the protrusion 231 is provided on the side of the lead housing 310 facing the lead socket 230.

[0083] The lead socket 230 can be integrally formed with the current lead rod 200, or a recessed mounting hole can be formed at the end of the current lead rod 200 that extends into the outer cavity. A mounting boss is provided at the end of the lead socket 230 near the current lead rod 200. The mounting boss of the lead socket 230 is embedded into the mounting hole of the current lead rod 200. The mounting boss and the mounting hole can be connected by interference fit, screw connection or snap connection. This embodiment does not limit this to a single method.

[0084] Furthermore, the lead socket 230 can be made of chromium zirconium copper with high rigidity and hardness to ensure that the lead socket 230 can withstand repeated friction insertion and removal.

[0085] Of course, the protrusion 231 is not limited to the spherical shape in the above embodiment. It can also be provided as a conical boss or a flattened sphere, etc. The structure of the recess 311 is adapted to the protrusion 231. This embodiment does not limit it to a single one.

[0086] Furthermore, an electrical connection enhancement coating is provided on the surface of the protrusion 231 and / or the recess 311. Specifically, the electrical connection enhancement coating can be provided on the surface of the protrusion 231 or on the surface of the recess 311; or the electrical connection enhancement coating can be provided on both the surface of the protrusion 231 and the surface of the recess 311. The electrical connection enhancement coating can be an indium plating layer, a silver plating layer, or a gold plating layer, etc. This embodiment does not limit this to a single one.

[0087] In this embodiment, the spherical protrusion 231 and the matching recess 311 have good alignment capability. Even if there is a slight coaxiality deviation between the current lead rod 200 and the conductive component 300, it is still ensured that the two can fit tightly when they are connected, avoiding poor contact due to alignment deviation and ensuring stable power transmission. In addition, the spherical protrusion 231 and the recess 311 have a larger contact area and more uniform contact, which can effectively reduce contact resistance, reduce heat loss during power transmission, and avoid local overheating and damage to components.

[0088] In addition, the electrical connection enhancement coating can further reduce contact resistance, improve conductivity and electrical connection stability, and enhance the wear resistance and oxidation resistance of the contact surface. This prevents wear and oxidation of the contact surface caused by long-term docking and separation operations, ensuring long-term stable electrical connection performance and extending the service life of the docking components.

[0089] It should be noted that, in this embodiment, as Figure 1 As shown, a flexible connection portion 320 is provided between the lead wire housing 310 and the inner wall 30. The outer periphery of the flexible connection portion 320 is fixedly connected to the inner wall 30, and the inner periphery is fixedly connected to the lead wire housing 310.

[0090] Specifically, the flexible connection part 320 is set as a metal mesh formed by woven metal wires, or a flexible metal sheet.

[0091] In this embodiment, the flexible connection part 320 can achieve flexible fixation between the lead wire housing 310 and the inner wall 30 of the superconducting magnet device, compensate for the installation deviation and temperature deformation deviation between the lead wire housing 310 and the inner wall 30, avoid the thermal contraction caused by the ultra-low temperature operation of the superconducting magnet, which causes the lead wire housing 310 to be deformed and damaged by force, and at the same time buffer the impact of equipment vibration on the lead wire housing 310, and protect the conductive component 300.

[0092] Furthermore, the flexible connection part 320 has a certain extension and offset capability, which can be combined with the alignment function of the spherical convex and concave mating structure to further improve the mating accuracy and fit between the current lead rod 200 and the lead shell 310, ensuring stable electrical connection.

[0093] Furthermore, in this embodiment, such as Figure 1 and Figure 2 As shown, a connecting section 240 is provided on the part of the current lead rod 200 that is away from the outer cavity and extends out of the sealed cylinder 100. A connecting block 241 is fixedly connected to the connecting section 240. The connecting block 241 is used to electrically connect to the external circuit. The connecting block 241 facilitates the quick and stable connection between the external circuit and the current lead rod 200, improving the convenience and reliability of the electrical connection.

[0094] Specifically, the outer peripheral wall of the connecting segment 240 is provided with external threads, and the connecting block 241 is connected to the connecting segment 240 through the connecting hole provided with internal threads on the inner wall 30. Of course, the connecting segment 240 and the connecting block 241 can also be connected by interference fit or snap-fit. This embodiment does not limit this to a single method.

[0095] Furthermore, in this embodiment, as Figure 1 As shown, it also includes a lead wire support 500 disposed in the inner cavity of the superconducting magnet device. One end of the lead wire support 500 is fixed and electrically connected to the conductive component 300, and the other end is fixed and electrically connected to the object to be excited 40. The lead wire support 500 realizes the precise docking and power conduction between the conductive component 300 and the object to be excited 40. In addition, the lead wire support 500 can provide precise support and fixation for the conductive component 300, ensuring that the conductive component 300 is stable in position under extreme working conditions such as extremely low temperature and vibration, and avoiding docking deviation with the current lead rod 200 due to the displacement of the conductive component 300.

[0096] The object to be excited 40 includes a superconducting magnet. Of course, the other end of the lead support 500 can be connected to the cold mass of the inner cavity and transmit the excitation current to the superconducting magnet. This embodiment does not specifically limit this.

[0097] In this embodiment, as Figure 1 As shown, the outer wall 20 of the superconducting magnet device is set as a Dewar, and the inner wall 30 of the superconducting magnet device is set as a cold screen. The superconducting magnet device can be a stellarator, a nuclear magnetic resonance (MRI) device, a superconducting accelerator, a magnetic confinement fusion device, or other types of superconducting magnet devices. This embodiment does not specifically limit this.

[0098] When the current lead rod 200 is in the separated position after excitation is completed, the Dewar and the cold shield themselves have a certain heat insulation effect, which greatly reduces the overall heat loss of the equipment, avoids excessive heat loss leading to excessive load on the cooling system, ensures that the overall cooling effect of the equipment reaches the preset target, and at the same time reduces the consumption of cooling medium and energy, and reduces the operating cost of the equipment.

[0099] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. In order to provide a deep understanding of this utility model, many specific details are included in the above description, and this utility model may also be implemented without using these details. In addition, in order to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0100] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0101] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model 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. Therefore, they should not be construed as limitations on the utility model.

[0102] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0103] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 embodiment based on the specific circumstances.

[0104] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A superconducting magnet pluggable binary current lead copper section structure, characterized in that, The application relates to a sealed cylinder body arranged on the outer wall of a superconducting magnet device and communicating with the outer chamber of the superconducting magnet device, a current lead rod arranged in the sealed cylinder body and extending into the outer chamber of the superconducting magnet device, and the end of the current lead rod away from the outer chamber being connected with an external circuit, the current lead rod being helically movable relative to the sealed cylinder body around the axial line of the sealed cylinder body, the outer peripheral wall of the current lead rod being provided with a joint part, the inner peripheral wall of the sealed cylinder body being provided with a limiting part matched with the joint part, and the limiting part being capable of limiting the axial movement of the current lead rod. The limiting part can limit the current lead rod in a joint position and a separation position, the end of the current lead rod in the joint position extending into the outer chamber and being combined with the conducting part, and the end of the current lead rod in the separation position extending into the outer chamber and being separated from the conducting part. The sealed cylinder body comprises a cylinder body and first and second flange parts arranged at the two ends of the cylinder body, each flange part surrounding and protruding from the outer peripheral surface of the cylinder body, and the first flange part being fixedly connected with the outer wall of the superconducting magnet device. The limiting part is a limiting flange fixedly arranged on the second flange part, the limiting flange being provided with a connecting hole, and the inner peripheral wall of the connecting hole being provided with a limiting internal thread; and the joint part is an external thread arranged on part of the outer peripheral wall of the current lead rod, the threaded section of the current lead rod provided with the external thread being arranged in the connecting hole, and the external thread being matched and connected with the limiting internal thread. The current lead rod further comprises a smooth section located in the sealed cylinder body, the smooth section being located on the side of the threaded section close to the inner wall of the superconducting magnet device.

2. The superconducting magnet plug-in binary current lead copper section structure of claim 1, wherein, A magnetic fluid sealing part is arranged between the smooth section and the corresponding inner wall surface of the sealed cylinder body. The magnetic fluid sealing part comprises a pair of bearings arranged along the axial direction of the current lead rod, a pair of magnetic pole rings and a permanent magnet arranged between the pair of bearings, the pair of magnetic pole rings being sleeved on the smooth section, the permanent magnet being located between the pair of magnetic pole rings, and magnetic fluid being filled between the pair of magnetic pole rings and on the side of the permanent magnet close to the smooth section.

3. The superconducting magnet plug-in binary current lead copper section structure of claim 2, wherein, A retaining ring is further arranged on the inner peripheral surface of the cylinder body at the positions where the pair of bearings are away from each other. The end of the current lead rod extending into the outer chamber is provided with a lead plug, the end of the lead plug away from the current lead rod being provided with a spherical protruding part, the conducting part is provided with a lead female shell, the side of the lead female shell facing the lead plug being provided with a concave part matched with and combined with the protruding part.

4. The superconducting magnet plug-in binary current lead copper section structure of claim 3, wherein, The surface of the protruding part and / or the concave part is provided with an electrically connected enhanced coating. ​ 5. The superconducting magnet plug-in binary current lead copper section structure according to any one of claims 1 to 4, characterized in that, ​ ​ 6. The superconducting magnet plug-in binary current lead copper section structure of claim 5, wherein, A flexible connecting part is arranged between the lead female shell and the inner wall, an outer periphery of the flexible connecting part is fixedly connected with the inner wall, and an inner periphery is fixedly connected with the lead female shell. The flexible connecting part is formed by wire weaving into a metal mesh or a flexible metal sheet.

7. The superconducting magnet plug-in binary current lead copper section structure according to any one of claims 1 to 4, characterized in that, A connecting section is arranged on a portion of the current lead rod that extends out of the outer chamber and out of the sealed cylinder, and a connecting block is fixedly connected on the connecting section, the connecting block being used for electrically connecting an external circuit.

8. The superconducting magnet pluggable binary current lead copper section structure of any one of claims 1-4, wherein, A lead supporting seat is further arranged in the inner chamber of the superconducting magnet device, one end of the lead supporting seat being fixedly and electrically connected with the conducting part, and the other end being fixedly and electrically connected with the object to be excited.

9. The superconducting magnet pluggable binary current lead copper section structure of any one of claims 1-4, wherein, The outer wall of the superconducting magnet device is arranged as a Dewar, and the inner wall of the superconducting magnet device is arranged as a cold screen.

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