Cage structure and superconducting magnet for superconducting joint protection and magnet support

Abstract

The present invention discloses a cage structure and a superconducting magnet for superconducting joint protection and magnet support, and relates to the technical field of superconducting magnets, wherein the cage structure includes: a support column, a support ring, a cold plate, a cold plate reinforcement plate, an axial tie rod, a radial tie rod, a superconducting joint, a joint protection cover, a superconducting coil, and a superconducting coil skeleton. The present application realizes superconducting joint protection and magnet support with a simple structure by designing a cage frame composed of a support column, a support ring, a cold plate, and a cold plate reinforcement plate, and combining axial tie rods and radial tie rods; by fixing the radial tie rods to the outside of the support ring from the radial direction, the heat conduction distance between the superconducting coil and the outer Dewar assembly is extended, heat leakage is reduced, and sufficient strength is provided. At the same time, the radial tie rods are at the bottom of the cage structure, and there is sufficient operating space, which is convenient for installation and maintenance.

Description

Technical Field

[0001] The present application relates to the technical field of superconducting magnets, and in particular to a cage structure and a superconducting magnet for superconducting joint protection and magnet support. Background Art

[0002] A superconducting joint is a fixing device that connects the ends of superconducting wires, and is used for the inlet and outlet joints or the intermediate lead-out joints of superconducting magnets. In the existing suspension support structure of superconducting magnets (taking niobium-tin superconducting magnets as an example), the cold plate is usually located at the top, connected to the cold head of the refrigerator, and the superconducting joint is located at the bottom. The superconducting joint at the bottom is easily damaged by impact during assembly and transportation, resulting in economic losses. Therefore, it is necessary to study the suspension support structure of superconducting magnets.

[0003] In the prior art, Chinese patent CN113628827A discloses a conduction-cooled superconducting magnet, including a cryogenic container, a cold shield, a skeleton, a superconducting coil, a superconducting cable, a current lead, a first cold head arranged on the outside of the cold shield for cooling the cold shield, and a second cold head arranged on the inside of the cold shield for cooling the superconducting coil, a switch lead and a superconducting switch are connected between the superconducting joints of the superconducting coil, a heat exchange conversion block connected to the first cold head by heat conduction is provided between the first cold head and the second cold head, a heat exchange through-hole is provided in the heat exchange through-hole, a gas heat exchange pipe is passed through the heat exchange through-hole, and a metal pipeline connected to the gas heat exchange pipe is wound around the periphery of the skeleton.

[0004] In order to protect the superconducting joints, it is usually necessary to install a protective cover at the bottom of the superconducting magnet, but the protective effect of the protective cover on the superconducting joints is limited. At the same time, in order to ensure the support strength and stability, the support structure of the superconducting magnet is generally more complicated. However, the above-mentioned prior art does not take the above-mentioned problems into consideration and cannot take into account both the protection of the superconducting joints and the support of the magnet. In addition, in the existing suspension support structure of the superconducting magnet, the cold plate is usually located at the top and connected to the cold head of the refrigerator. The axial pull rod and the radial pull rod are both fixed on the cold plate. Due to the size limitation of the outer cylinder of the dewar, the radial gap is limited, the length of the radial pull rod is short, and the heat leakage is large. Moreover, since the cold plate is far away from the bottom of the superconducting magnet, the radial space inside the dewar of the superconducting magnet is small, the operating space is limited, and it is not convenient for installation and maintenance. The above-mentioned prior art also does not solve this problem. Summary of the invention

[0005] The present application provides a cage structure and a superconducting magnet for superconducting joint protection and magnet support, so as to solve the problems that the existing superconducting magnet technology cannot take into account both superconducting joint protection and magnet support, has large heat leakage, limited operating space, and is inconvenient for installation and maintenance.

[0006] On the one hand, the present application provides a cage structure for superconducting joint protection and magnet support, including: a support column, a support ring, a cold plate, a cold plate reinforcement plate, an axial tie rod, a radial tie rod, a superconducting joint, a joint protection cover, a superconducting coil, and a superconducting coil frame.

[0007] The lower side of the support column is fixedly connected to the support ring, and the upper side of the support column is fixedly connected to the lower periphery of the cold conduction plate.

[0008] The upper side of the cold conduction plate is fixedly connected to the cold conduction plate reinforcement plate.

[0009] The superconducting coil is wound and fixed on the superconducting coil frame.

[0010] The upper side of the superconducting coil frame is fixedly connected to the lower side of the cold conduction plate, and the lower side of the superconducting coil frame is fixedly connected to the superconducting joint.

[0011] The joint protection cover is fixedly connected to the lower periphery of the superconducting coil frame to form a protection cavity, and the superconducting joint is located inside the protection cavity.

[0012] The axial pull rod axially passes through the cooling plate reinforcement plate and the cooling plate, and is fixedly connected to the superconducting coil frame.

[0013] The radial tie rod is fixedly connected to the outer side of the support ring from a radial direction.

[0014] The bottom of the joint protection cover is higher than the bottom of the support ring.

[0015] In a possible implementation, the number of the support columns is not less than three.

[0016] In a possible implementation manner, the support ring is a circular ring or a polygonal ring.

[0017] In a possible implementation, the support column, the support ring, and the joint protection cover are made of one of stainless steel, aluminum alloy, titanium alloy, nylon, glass fiber, and carbon fiber.

[0018] In a possible implementation, the number of the axial tie rods is not less than four.

[0019] In a possible implementation, the number of the radial tie rods is not less than three.

[0020] On the other hand, the present application provides a superconducting magnet, including a cage structure for superconducting joint protection and magnet support, and also includes: a cold shield assembly and an external Dewar assembly.

[0021] The cage structure is located inside the cold shield assembly, and the cold shield assembly is located inside the outer Dewar assembly. The cage structure, the cold shield assembly, and the outer Dewar assembly are fixed by axial tie rods and radial tie rods.

[0022] In a possible implementation, a superconducting magnet further includes: shock-absorbing foam.

[0023] The shock absorbing foam is mounted on the underside of the cage structure.

[0024] The cage structure and superconducting magnet used for superconducting joint protection and magnet support in this application have the following advantages:

[0025] By designing a cage-type frame composed of support columns, support rings, cold plate, and cold plate reinforcement plates, combined with axial and radial tie rods, superconducting joint protection and magnet support are achieved with a simple structure. Among them, superconducting joint protection is achieved by the cage-type frame composed of support columns, support rings, cold plate, and cold plate reinforcement plates, and the bottom of the joint protection cover is higher than the bottom of the support ring; magnet support is achieved by the cage-type frame combined with axial and radial tie rods.

[0026] By fixing the radial tie rods radially to the outside of the support ring, the radial heat conduction distance is changed to outer Dewar assembly-radial tie rods-support ring-support column-conducting cold plate-superconducting coil skeleton-superconducting coil, which extends the heat conduction distance between the superconducting coil and the outer Dewar assembly, reduces heat leakage, and has sufficient strength. At the same time, the radial tie rods are at the bottom of the cage structure, close to the bottom of the outer Dewar assembly, with sufficient operating space for easy installation and maintenance.

[0027] By installing shock-absorbing foam on the lower side of the cage structure, the vibration and shock during the transportation of the superconducting magnet can be reduced at a relatively low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of a cage structure for superconducting joint protection and magnet support provided in an embodiment of the present application;

[0030] Figure 2 A schematic cross-sectional view of a cage structure for superconducting joint protection and magnet support provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the structure of a superconducting magnet provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of the cross-sectional structure of a superconducting magnet during transportation provided in an embodiment of the present application.

[0033] Description of reference numerals:

[0034] 1-support column, 2-support ring, 3-cold plate, 4-cold plate reinforcement plate, 5-axial tie rod, 6-radial tie rod, 7-superconducting joint, 8-joint protection cover, 9-superconducting coil, 10-superconducting coil skeleton, 11-cage structure, 12-cold shield assembly, 13-external Dewar assembly, 14-shock-absorbing foam. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] like Figures 1 to 3 As shown, an embodiment of the present application provides a cage structure 11 for superconducting joint protection and magnet support, including: a support column 1, a support ring 2, a cold plate 3, a cold plate reinforcement plate 4, an axial tie rod 5, a radial tie rod 6, a superconducting joint 7, a joint protection cover 8, a superconducting coil 9, and a superconducting coil skeleton 10.

[0037] The lower side of the support column 1 is fixedly connected to the support ring 2 , and the upper side of the support column 1 is fixedly connected to the lower periphery of the cooling plate 3 .

[0038] The upper side of the cooling plate 3 is fixedly connected to the cooling plate reinforcement plate 4 .

[0039] The superconducting coil 9 is wound and fixed on the superconducting coil frame 10 .

[0040] The upper side of the superconducting coil skeleton 10 is fixedly connected to the lower side of the cold plate 3 , and the lower side of the superconducting coil skeleton 10 is fixedly connected to the superconducting joint 7 .

[0041] The joint protection cover 8 is fixedly connected to the lower periphery of the superconducting coil skeleton 10 to form a protection cavity, and the superconducting joint 7 is located inside the protection cavity.

[0042] The axial pull rod 5 axially passes through the cooling plate reinforcement plate 4 and the cooling plate 3 , and is fixedly connected to the superconducting coil skeleton 10 .

[0043] The radial tie rods 6 are fixedly connected to the outer side of the support ring 2 from the radial direction.

[0044] The bottom of the joint protection cover 8 is higher than the bottom of the support ring 2 .

[0045] Specifically, in this embodiment, the superconducting joint 7, the joint protection cover 8, the superconducting coil 9, and the superconducting coil skeleton 10 are all located inside the cage-type frame formed by the support column 1, the support ring 2, the cold plate 3, and the cold plate reinforcement plate 4.

[0046] Specifically, since the bottom of the joint protection cover 8 is higher than the bottom of the support ring 2, when the superconducting magnet vibrates or is impacted during assembly and transportation, it is preferentially supported by the bottom of the support ring 2, thereby protecting the superconducting joint 7 and improving the safety of the superconducting joint 7.

[0047] In this embodiment, one end of the axial pull rod 5 axially passes through the cold plate reinforcement plate 4 and the cold plate 3 and is fixedly connected to the superconducting coil skeleton 10, and the other end is used to axially pass through the cold shield assembly 12 and is fixedly suspended on the top of the outer Dewar assembly 13; one end of the radial pull rod 6 is radially fixedly connected to the outer side of the support ring 2, and the other end is used to radially pass through the cold shield assembly 12 and is fixedly connected to the side of the outer Dewar assembly 13.

[0048] Exemplarily, the number of the support columns 1 is not less than three.

[0049] Specifically, in the present embodiment, the number of the support columns 1 is set to three and is evenly distributed. In other possible embodiments, the number of the support columns 1 may be increased as needed to enhance the supporting strength.

[0050] Exemplarily, the support ring 2 is in the shape of a circular ring or a polygonal ring.

[0051] Specifically, in this embodiment, the support ring 2 is in the shape of a circular ring. In other possible embodiments, a polygonal ring such as a triangular ring or a square ring may also be used.

[0052] Exemplarily, the support column 1, the support ring 2, and the joint protection cover 8 are made of one of stainless steel, aluminum alloy, titanium alloy, nylon, glass fiber, and carbon fiber.

[0053] Specifically, in this embodiment, the support column 1 and the support ring 2 are made of stainless steel, and the joint protection cover 8 is made of nylon. In other possible embodiments, the materials of the support column 1, the support ring 2, and the joint protection cover 8 can also be selected according to needs.

[0054] Specifically, the joint protection cover 8 is generally made of metal materials such as stainless steel, aluminum alloy, or composite non-metallic materials such as nylon, glass fiber, and carbon fiber. When the joint protection cover 8 of the metal material is in an alternating magnetic field, eddy currents will be induced, and the eddy currents will generate Joule heat. The faster the magnetic field changes, the greater the Joule heat generated, which can easily lead to magnet quenching. Generally, the slit method is adopted to reduce the cross-sectional area of ​​the current interconnection loop and reduce the eddy current of the component, but it cannot be completely eliminated. Secondly, when the superconducting magnet quenches, the magnetic flux changes instantly, and the joint protection cover 8 of the metal material will be deformed and damaged by the electromagnetic force. The joint protection cover 8 of the non-metallic material has a low strength, and when it is impacted during the assembly or transportation of the magnet, the protective effect on the superconducting joint is limited.

[0055] In this embodiment, the nylon joint protection cover 8 is used in combination with the support column 1 and the support ring 2 to further improve the protection effect of the superconducting joint.

[0056] Exemplarily, the number of the axial tie rods 5 is not less than four.

[0057] Specifically, in the present embodiment, the number of the axial tie rods 5 is set to four and evenly distributed. In other possible embodiments, the number of the axial tie rods 5 may be increased as needed to enhance the supporting strength.

[0058] Exemplarily, the number of the radial tie rods 6 is not less than three.

[0059] Specifically, in the present embodiment, the number of radial tie rods 6 is set to three and is evenly distributed. In other possible embodiments, the number of radial tie rods 6 may be increased as needed to enhance the supporting strength.

[0060] like Figure 3 As shown, an embodiment of the present application further provides a superconducting magnet, including a cage structure 11 for superconducting joint protection and magnet support, and also includes: a cold shield assembly 12 and an external Dewar assembly 13.

[0061] The cage structure 11 is located inside the cold shield assembly 12 , and the cold shield assembly 12 is located inside the outer Dewar assembly 13 . The cage structure 11 , the cold shield assembly 12 , and the outer Dewar assembly 13 are fixed by axial tie rods 5 and radial tie rods 6 .

[0062] Specifically, in this embodiment, the manufacturing and assembly process of the superconducting magnet is as follows:

[0063] First, the superconducting coil 9 is wound and fixed on the superconducting coil skeleton 10, and the cold plate 3 and the cold plate reinforcement plate 4 are fixed to one end face of the superconducting coil skeleton 10 by screws. Then, a superconducting joint 7 is made on the other end face of the superconducting coil skeleton 10, and the joint protection cover 8 is fixed to the end face of the corresponding superconducting joint 7 of the superconducting coil skeleton 10 by screws, and then the support column 1 and the support ring 2 are installed by bolts; one end of the axial pull rod 5 is axially passed through the cold plate reinforcement plate 4 and the cold plate 3, and fixedly connected to the superconducting coil skeleton 10, and the other end is axially passed through the cold shield assembly 12, and fixedly hung on the top of the outer Dewar assembly 13, at which time the cold plate 3 is located at the upper part and connected to the cold chain of the refrigerator; one end of the radial pull rod 6 is radially fixedly connected to the outer side of the support ring 2, and the other end is radially passed through the cold shield assembly 12, and fixedly connected to the side of the outer Dewar assembly 13, and the manufacturing and assembly of the superconducting magnet is completed.

[0064] like Figure 4 As shown, exemplarily, a superconducting magnet further includes: shock-absorbing foam 14 .

[0065] The shock absorbing foam 14 is installed on the lower side of the cage structure 11 .

[0066] Specifically, in this embodiment, before transporting the superconducting magnet, the bottom plate of the outer Dewar assembly 13 and the bottom plate of the cold shield assembly 12 are disassembled, and the bottom plate of the cold shield assembly 12 is taken out, and then the shock-absorbing foam 14 is installed on the lower side of the cage structure 11 (i.e., the lower side of the support ring 2), and then the bottom plate of the outer Dewar assembly 13 is reinstalled, so that the shock-absorbing foam 14 is installed between the support ring 2 and the bottom plate of the outer Dewar assembly 13, which can effectively reduce the vibration during transportation and protect the superconducting magnet. There is no need to design a complex shock-absorbing packaging box and use an expensive shock-absorbing transport vehicle, which significantly reduces the transportation cost.

[0067] The embodiment of the present application realizes superconducting joint protection and magnet support with a simple structure by designing a cage-type frame composed of a support column 1, a support ring 2, a cold plate 3, and a cold plate reinforcement plate 4, combined with an axial tie rod 5 and a radial tie rod 6. Among them, superconducting joint protection is realized by a cage-type frame composed of a support column 1, a support ring 2, a cold plate 3, and a cold plate reinforcement plate 4, and the bottom of the joint protection cover 8 is higher than the bottom of the support ring 2; magnet support is realized by a cage-type frame combined with an axial tie rod 5 and a radial tie rod 6.

[0068] By fixing the radial tie rod 6 radially to the outside of the support ring 2, the radial heat conduction distance is changed to outer Dewar assembly 13-radial tie rod 6-support ring 2-support column 1-cooling plate 3-superconducting coil skeleton 10-superconducting coil 9, thereby extending the heat conduction distance between the superconducting coil 9 and the outer Dewar assembly 13, reducing heat leakage, and having sufficient strength. At the same time, the radial tie rod 6 is at the bottom of the cage structure 11, which is close to the bottom of the outer Dewar assembly 13, and has sufficient operating space, which is convenient for installation and maintenance.

[0069] By installing the shock-absorbing foam 14 on the lower side of the cage structure 11 , the vibration and impact during the transportation of the superconducting magnet can be reduced at a relatively low cost.

[0070] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0071] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A cage structure for superconducting joint protection and magnet support, characterized in that: include: Support column, support ring, cold plate, cold plate reinforcement plate, axial tie rod, radial tie rod, superconducting joint, joint protection cover, superconducting coil, superconducting coil skeleton; The lower side of the support column is fixedly connected to the support ring, and the upper side of the support column is fixedly connected to the lower periphery of the cold conduction plate; The upper side of the cold conduction plate is fixedly connected to the cold conduction plate reinforcement plate; The superconducting coil is wound and fixed on the superconducting coil frame; The upper side of the superconducting coil skeleton is fixedly connected to the lower side of the cold plate, and the lower side of the superconducting coil skeleton is fixedly connected to the superconducting joint; The joint protection cover is fixedly connected to the lower periphery of the superconducting coil frame to form a protection cavity, and the superconducting joint is located inside the protection cavity; The axial pull rod axially passes through the cooling plate reinforcement plate and the cooling plate, and is fixedly connected to the superconducting coil skeleton; The radial pull rod is fixedly connected to the outer side of the support ring from the radial direction; The bottom of the joint protection cover is higher than the bottom of the support ring.

2. The cage structure for superconducting joint protection and magnet support according to claim 1, characterized in that: The number of the support columns is not less than three.

3. The cage structure for superconducting joint protection and magnet support according to claim 1, characterized in that: The support ring is a circular ring or a polygonal ring.

4. The cage structure for superconducting joint protection and magnet support according to claim 1, characterized in that: The support column, the support ring and the joint protection cover are made of one of stainless steel, aluminum alloy, titanium alloy, nylon, glass fiber and carbon fiber.

5. The cage structure for superconducting joint protection and magnet support according to claim 1, characterized in that: The number of the axial tie rods is not less than four.

6. The cage structure for superconducting joint protection and magnet support according to claim 1, characterized in that: The number of the radial tie rods is not less than three.

7. A superconducting magnet, characterized in that: The cage structure for superconducting joint protection and magnet support according to any one of claims 1 to 6 further comprises: a cold shield assembly, an external Dewar assembly; The cage structure is located inside the cold shield assembly, and the cold shield assembly is located inside the outer Dewar assembly. The cage structure, the cold shield assembly, and the outer Dewar assembly are fixed by axial tie rods and radial tie rods.

8. A superconducting magnet according to claim 7, characterized in that: Also includes: Shock-absorbing foam; The shock absorbing foam is mounted on the underside of the cage structure.

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