Electromagnetic shielding device for GM refrigerator and superconducting magnet maglev train

Abstract

The embodiment of the invention provides an electromagnetic shielding device for a GM refrigerating machine and a superconducting magnet maglev train, the electromagnetic shielding device is used in cooperation with the GM refrigerating machine, the electromagnetic shielding device comprises an inner shielding assembly and an outer shielding assembly arranged on the outer wall of the inner shielding assembly in a sleeving mode, and the inner shielding assembly is connected with the outer shielding assembly; the inner shielding assembly is made of a permalloy material, and the outer shielding assembly is made of an aluminum alloy material of which the surface is aluminized; during use, the GM refrigerating machine is arranged in the inner shielding assembly, and a magnetic field outside the GM refrigerating machine is shielded through the inner shielding assembly and the outer shielding assembly; the device is reasonable in structural design, and can effectively block static magnetic field and high-frequency alternating magnetic field harmonic waves in a back field. The invention is suitable for the technical field of refrigerator shielding devices.

Description

Technical Field

[0001] This application relates to the technical field of refrigeration machine shielding devices, and particularly to an electromagnetic shielding device for a GM refrigeration machine and a superconducting magnet maglev train. Background Art

[0002] The Gifford-Mcmahon refrigeration machine (abbreviated as GM refrigeration machine) is a regenerative small cryogenic refrigeration machine. Since its invention in 1959, its lowest refrigeration temperature has broken through to the liquid helium temperature range, and it is the only cryogenic refrigeration machine in the world that has been mass-produced industrially. The GM refrigeration machine has the advantages of simple structure, reliable operation, stable performance, convenient operation, and high refrigeration efficiency in the liquid helium temperature range, and has been widely used in fields such as cryogenic vacuum pumps, high-temperature superconducting cables, nuclear fusion, particle accelerators, superconducting energy storage devices, large background magnets, superconducting motors, and nuclear magnetic resonance magnets.

[0003] For a GM refrigeration machine, the specific heat capacity of the rare earth material in the secondary regenerator filler is affected by the external magnetic field. In addition, the permanent magnet in the cold head motor cannot work properly in a strong magnetic field. Taking the RDL415 refrigeration machine as an example, the RDL415 refrigeration machine includes a permanent magnet motor for driving the rotary valve, a secondary regenerator, and a metal mating conical surface for pushing the piston. During the processes of magnet excitation, demagnetization, and quench of the magnet, the GM refrigeration machine is exposed to a transient magnetic field, and all metal components inside the refrigeration machine will generate AC losses, thereby causing attenuation of the refrigeration performance. In addition, the hard magnetic material in the permanent magnet motor may experience phenomena such as demagnetization and continued magnetization in a relatively strong external magnetic field, and the operating current of the corresponding motor winding will increase, causing excessive heating of the motor and affecting the service life of the refrigeration machine. According to existing research results, the cold head motor needs to be placed in a low magnetic field area with a magnetic field less than 500 Gs.

[0004] However, in the application scenario of a superconducting magnet maglev train, in addition to being affected by the static magnetic field generated by the superconducting magnet, the refrigeration machine also needs to face the influence of electromagnetic harmonics generated by the ground alternating magnetic field. Therefore, in a superconducting magnet maglev train, the refrigeration machine needs to be designed with electromagnetic shielding to simultaneously shield the ground static magnetic field and the alternating harmonic magnetic field. At present, the shielding structure used in GM refrigeration machines is mainly applied to static magnets in high magnetic fields on the ground, and there is no shielding structure that can simultaneously shield alternating harmonic magnetic fields and static magnetic fields. Summary of the Invention

[0005] In order to solve one of the above technical defects, an electromagnetic shielding device for a GM refrigeration machine and a superconducting magnet maglev train are provided in the embodiments of this application.

[0006] According to the first aspect of the embodiments of the present application, an electromagnetic shielding device for a GM refrigerator is provided, which is used in cooperation with a GM refrigerator. The electromagnetic shielding device includes: an inner shielding component and an outer shielding component sleeved on the outer wall of the inner shielding component, and the inner shielding component is connected to the outer shielding component; the inner shielding component is made of permalloy, and the outer shielding component is made of aluminum alloy with an aluminum coating on the surface; during use, the GM refrigerator is arranged inside the inner shielding component, and the inner shielding component and the outer shielding component are used to shield the magnetic field outside the GM refrigerator.

[0007] Preferably, the inner shielding component includes:

[0008] A first housing component, including a first side plate and a first bottom plate, the first side plate has a first opening, and the first bottom plate is connected to the bottom of the first side plate; a plurality of first connectors for connecting with the outer shielding component are arranged on the outer wall of the first side plate;

[0009] A first back plate component, connected to the first opening of the first side plate, the first back plate component includes a first back plate and a first collar connected below the first back plate; a first groove is arranged at the bottom of the first back plate, a second groove is arranged at the top of the first collar, and the first groove and the second groove are combined to form a first through hole;

[0010] A first top plate, connected to the top of the first side plate.

[0011] More preferably, the outer shielding component includes:

[0012] A second housing component, including a second side plate and a second bottom plate, the second side plate has a second opening, and the second bottom plate is connected to the bottom of the second side plate; first connection holes are arranged at positions corresponding to the first connectors on the second side plate, and the first connectors and the first connection holes are connected together through first threaded components;

[0013] A second back plate component, connected to the second opening of the second side plate, the second back plate component includes a second back plate and a second collar connected below the second back plate; a third groove is arranged at the bottom of the second back plate, a fourth groove is arranged at the top of the second collar, and the third groove and the fourth groove are combined to form a second through hole;

[0014] A second top plate, connected to the top of the second side plate.

[0015] More preferably, the cross-section of the first side plate is a pentagonal structure with an opening; the first top plate is a hexagonal structure, and first extension parts extend from the edges of the first top plate towards the bottom, and the first extension parts wrap around the outer sides of the top of the first side plate and the outer sides of the top of the first back plate; at least one second connection hole is provided at a position corresponding to the top of the first side plate on the first extension part, a third connection hole is provided at a position corresponding to the second connection hole on the top of the first side plate, and the second connection hole and the third connection hole are connected together by a second threaded component.

[0016] More preferably, second extension parts extend inwards from both sides of the first back plate, fourth connection holes are provided on the second extension parts, fifth connection holes are provided at positions corresponding to the fourth connection holes on the first side plate, and the fourth connection holes and the fifth connection holes are connected together by a third threaded component.

[0017] More preferably, in the pentagonal structure of the first side plate, there are a total of four inner angles, and each inner angle is 135°.

[0018] Preferably, the cross-section of the second side plate is a pentagonal structure with an opening; the second top plate is a hexagonal structure, and third extension parts extend from the edges of the second top plate towards the bottom, and the third extension parts wrap around the outer sides of the top of the second side plate and the outer sides of the top of the second back plate; at least one sixth connection hole is provided at a position corresponding to the top of the second side plate on the third extension part, a seventh connection hole is provided at a position corresponding to the sixth connection hole on the top of the second side plate, and the sixth connection hole and the seventh connection hole are connected together by a fourth threaded component.

[0019] More preferably, fourth extension parts extend inwards from both sides of the second back plate, eighth connection holes are provided on the fourth extension parts, ninth connection holes are provided at positions corresponding to the eighth connection holes on the second side plate, and the eighth connection holes and the ninth connection holes are connected together by a fifth threaded component.

[0020] Preferably, in the pentagonal structure of the second side plate, there are a total of four inner angles, and each inner angle is 135°.

[0021] According to the second aspect of the embodiments of the present application, a superconducting magnet maglev train is provided, including: a GM refrigerator; the electromagnetic shielding device as described above, and the GM refrigerator is arranged inside the inner shielding component; a train body; a mounting base, one end of the mounting base is connected to the train body, and the other end of the mounting base sequentially penetrates through the outer shielding component and the inner shielding component and then is connected to the back of the GM refrigerator.

[0022] In this application, the electromagnetic shielding device has a reasonable structural design, is adapted to the outer wall of the GM refrigerator, and can protect the GM refrigerator. By using the inner shielding component and the outer shielding component in combination, it can effectively block the static magnetic field and high-frequency alternating magnetic field harmonics in the back field, avoid the influence of the external environment on the refrigerator, and improve the service life and operation reliability of the GM refrigerator. The inner shielding component is made of permalloy, which has a high magnetic conductivity efficiency and can effectively shield the influence of the static magnetic field on the refrigerator. At the same time, permalloy has high structural strength, stiffness and fatigue resistance, which improves the support stiffness of the entire electromagnetic shielding device. The outer shielding component is made of aluminum alloy with a surface aluminized layer. Aluminum alloy has a light texture and high structural strength, and also has high electrical conductivity and thermal conductivity. When the aluminum alloy material shields the external high-frequency alternating harmonics, electromagnetic induction eddy currents will generate heat. By utilizing the high thermal conductivity characteristic of aluminum alloy to make good contact with air, heat dissipation can be carried out to avoid heat accumulation from damaging the GM refrigerator. The surface is plated with pure aluminum with high electrical conductivity. The structure of aluminum alloy plus pure aluminum can ensure that the outer shielding component has good structural strength, reduce the weight of the entire electromagnetic shielding device, achieve lightweight design, and effectively shield the influence of external high-frequency alternating harmonics on the refrigerator.

[0023] Other features and advantages of this application will be described in the subsequent specification, and some of them will be obvious from the specification or understood by implementing this application. The objectives and other advantages of this application can be realized and obtained through the content pointed out in the written specification, claims, and drawings. Brief Description of the Drawings

[0024] The drawings described herein are used to provide a further understanding of this application and form a part of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0025] Figure 1 is the top view of an electromagnetic shielding device for a GM refrigerator provided by an embodiment of this application;

[0026] Figure 2 is the exploded view of an electromagnetic shielding device for a GM refrigerator provided by an embodiment of this application;

[0027] Figure 3 is Figure 2 the structural schematic diagram of the first backplane component and the second backplane component in

[0028] Figure 4 is the top view of a superconducting magnet maglev train provided by an embodiment of this application;

[0029] In the figure:

[0030] 1 is a GM refrigerator, 2 is the train body, and 3 is the mounting base;

[0031] 10 is the inner shielding component, 101 is the first housing component, 102 is the first backplane component, 103 is the first top plate, 1011 is the first connecting piece, 1012 is the third connecting hole, 1013 is the fifth connecting hole, 1021 is the first backplane, 1022 is the first ferrule, 1023 is the first through hole, 1031 is the first extension part, 10211 is the second extension part, 10212 is the fourth connecting hole, 10311 is the second connecting hole;

[0032] 20 is the outer shielding component, 201 is the second housing component, 202 is the second backplane component, 203 is the second top plate, 2011 is the first connecting hole, 2012 is the seventh connecting hole, 2013 is the ninth connecting hole, 2021 is the second backplane, 2022 is the second ferrule, 2023 is the second through hole, 2031 is the third extension part, 20211 is the fourth extension part, 20212 is the eighth connecting hole, 20311 is the sixth connecting hole. Detailed implementation manners

[0033] In order to make the technical solutions and advantages in the embodiments of the present application clearer and more understandable, the following further describes the exemplary embodiments of the present application in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0034] Figure 1 This is a top view of an electromagnetic shielding device for a GM refrigerator provided by an embodiment of the present application. As Figure 1 shown, in view of the above problems, an electromagnetic shielding device for a GM refrigerator is provided in an embodiment of the present application. The electromagnetic shielding device is used in cooperation with the GM refrigerator 1 and includes: an inner shielding component 10 and an outer shielding component 20 sleeved on the outer wall of the inner shielding component 10, and the inner shielding component 10 is connected to the outer shielding component 20; the inner shielding component 10 is made of permalloy, and the outer shielding component 20 is made of aluminum alloy with an aluminum coating on the surface, and the aluminum alloy is 6063 aluminum alloy; during use, the GM refrigerator 1 is arranged inside the inner shielding component 10, and the inner shielding component 10 and the outer shielding component 20 are used to shield the magnetic field outside the GM refrigerator 1.

[0035] The electromagnetic shielding device in this application has a reasonable structural design and is adapted to the outer wall of the GM refrigerator, which can protect the GM refrigerator. The use of an inner shielding component and an outer shielding component in combination can effectively block the static magnetic field and high-frequency alternating magnetic field harmonics in the back field, avoid the influence of the external environment on the refrigerator, and improve the service life and operation reliability of the GM refrigerator. The inner shielding component is made of permalloy, which has a high magnetic conductivity efficiency and can effectively shield the influence of the static magnetic field on the refrigerator. At the same time, permalloy has high structural strength, stiffness and fatigue resistance, which improves the support stiffness of the entire electromagnetic shielding device. The outer shielding component is made of aluminum alloy with a surface aluminum plating. The aluminum alloy is light in texture and has high structural strength. At the same time, it has high electrical conductivity and thermal conductivity. When the aluminum alloy material shields the external high-frequency alternating harmonics, electromagnetic induction eddy currents will generate heat. The high thermal conductivity characteristic of the aluminum alloy is used to make good contact with the air for heat dissipation, so as to avoid heat accumulation and damage to the GM refrigerator. The surface is plated with pure aluminum with high electrical conductivity. The structure of aluminum alloy plus pure aluminum can ensure that the outer shielding component has good structural strength, reduce the weight of the entire electromagnetic shielding device, achieve lightweight design, and effectively shield the influence of external high-frequency alternating harmonics on the refrigerator.

[0036] Figure 2 The following is an exploded view of an electromagnetic shielding device for a GM refrigerator provided by an embodiment of this application, as Figure 2 shown. Further, the inner shielding component 10 includes:

[0037] A first housing assembly 101, including a first side plate and a first bottom plate. The first side plate has a first opening, and the first bottom plate is connected to the bottom of the first side plate; a plurality of first connectors 1011 for connecting with the outer shielding component 20 are arranged on the outer wall of the first side plate; specifically, the first side plate and the first bottom plate are of an integrally formed structure;

[0038] A first back plate assembly 102, connected to the first opening of the first side plate. The first back plate assembly 102 includes a first back plate 1021 and a first bushing 1022 connected to the lower part of the first back plate 1021; a first groove is provided at the bottom of the first back plate 1021, and a second groove is provided at the top of the first bushing 1022. The first groove and the second groove are combined to form a first through hole 1023; specifically, the first back plate 1021 and the first bushing are detachably connected together by screws;

[0039] A first top plate 103, connected to the top of the first side plate.

[0040] In this application, the inner shielding component is a detachable connection structure, which is convenient for the later maintenance and repair of the GM refrigerator. Among them, the first housing component can wrap the bottom and side parts of the GM refrigerator. The first back panel component is arranged on the back of the GM refrigerator. The first through hole provides a receiving space for the installation base of the GM refrigerator. The first back panel and the first ferrule can hold the installation base of the GM refrigerator tightly, and then be fastened by screws, making the structure more stable.

[0041] Furthermore, the cross-section of the first side plate is a pentagonal structure with an opening. In the pentagonal structure of the first side plate, there are a total of four inner angles, and each inner angle is 135°. In the pentagonal structure of the first side plate, on the outer upper part and the outer lower part of the three surfaces corresponding to the three middle sides, first connecting members 1011 are arranged, which is convenient for stably connecting the outer shielding component. In the pentagonal structure of the first side plate, the two surfaces corresponding to the two end sides are parallelly distributed, which is convenient for connecting with the first back panel component 102. The first top plate 103 is a hexagonal structure, and at the edges of the first top plate 103, first extending parts 1031 extend towards the bottom. The first extending parts 1031 wrap the outer side of the top of the first side plate and the outer side of the top of the first back panel 1021. At least one second connection hole 10311 is arranged at the position corresponding to the top of the first side plate on the first extending part 1031, and a third connection hole 1012 is arranged at the position corresponding to the second connection hole 10311 on the top of the first side plate. The second connection hole 10311 and the third connection hole 1012 are connected together by a second threaded component.

[0042] In this application, the cross-section of the first side plate is set as a pentagonal structure with an opening, which is adapted to the outer wall shape of the GM refrigerator, can better stably connect the GM refrigerator, makes the structure between the inner shielding component, the GM refrigerator and the outer shielding component more compact, has better support effect and shielding effect, and effectively avoids material waste and saves more cost.

[0043] Figure 3 For Figure 2 the structural schematic diagrams of the first back panel component and the second back panel component in Figure 3 as shown, furthermore, on both sides of the first back panel 1021, second extending parts 10211 extend inwards. Fourth connection holes 10212 are arranged on the second extending parts 10211, and fifth connection holes 1013 are arranged at the positions corresponding to the fourth connection holes 10212 on the first side plate. The fourth connection holes 10212 and the fifth connection holes 1013 are connected together by a third threaded component. In this application, the first back panel and the first side plate are detachably connected together by the third threaded component, making the connection structure more stable.

[0044] Furthermore, the outer shielding component 20 includes:

[0045] The second housing assembly 201 includes a second side plate and a second bottom plate. The second side plate has a second opening, and the second bottom plate is connected to the bottom of the second side plate. At a position corresponding to the first connecting member 1011 on the second side plate, a first connecting hole 2011 is provided, and the first connecting member 1011 and the first connecting hole 2011 are connected together by a first threaded assembly. Specifically, the second side plate and the second bottom plate are of an integrally formed structure.

[0046] The second back plate assembly 202 is connected to the second opening of the second side plate. The second back plate assembly 202 includes a second back plate 2021 and a second bushing 2022 connected below the second back plate 2021. A third groove is provided at the bottom of the second back plate 2021, and a fourth groove is provided at the top of the second bushing 2022. The third groove and the fourth groove are combined to form a second through hole 2023. Specifically, the second back plate and the second bushing are detachably connected together by screws.

[0047] The second top plate 203 is connected to the top of the second side plate.

[0048] In this application, the outer shielding assembly is also a detachable structure, which is convenient for adjusting the internal inner shielding assembly and for the later maintenance and repair of the GM refrigerator. Among them, the second housing assembly can wrap the bottom and side parts of the first housing assembly. The second back plate assembly is arranged on the back of the first back plate assembly. The second through hole also provides a receiving space for the installation base of the GM refrigerator. The second back plate and the second bushing can hold the installation base of the GM refrigerator tightly and then be fastened by screws, making the structure more stable.

[0049] Specifically, the outer shielding assembly 20 is arranged in parallel with the outside of the inner shielding assembly 10, that is, the second housing assembly 201 and the first housing assembly 101, the second back plate assembly 202 and the first back plate assembly 102, and the second top plate 203 and the first top plate 103 are all arranged in parallel, with a compact structure, which improves the stiffness and stability of the entire electromagnetic shielding device.

[0050] Further, the cross-section of the second side plate is a pentagonal structure with an opening. In the pentagonal structure of the second side plate, there are a total of four inner angles, each inner angle being 135°. In the pentagonal structure of the second side plate, on the outer upper part and the outer lower part of the three surfaces corresponding to the three middle sides, first connection holes 2011 are provided. The positions of the first connection holes 2011 correspond to the positions of the first connecting members 1011, firmly connecting the first side plate and the second side plate together; in the pentagonal structure of the second side plate, the two surfaces corresponding to the two sides provided at the ends are parallelly distributed, facilitating the connection with the second back plate assembly 202; the second top plate 203 is a hexagonal structure, and at the edges of the second top plate 203, third extension parts 2031 extend towards the bottom. The third extension parts 2031 wrap around the outer side of the top of the second side plate and the outer side of the top of the second back plate 2021; at least one sixth connection hole 20311 is provided at the position corresponding to the top of the second side plate on the third extension part 2031, and a seventh connection hole 2012 is provided at the position corresponding to the sixth connection hole 20311 on the top of the second side plate. The sixth connection hole 20311 and the seventh connection hole 2012 are connected together by a fourth threaded assembly.

[0051] In this application, the cross-section of the second side plate is set as a pentagonal structure with an opening, which can better connect with the first side plate, has a more compact structure, better shielding effect, effectively avoids waste of materials, and saves more costs.

[0052] Furthermore, fourth extension parts 20211 extend inwards on both sides of the second back plate 2021. Eighth connection holes 20212 are provided on the fourth extension parts 20211, and ninth connection holes 2013 are provided at the positions corresponding to the eighth connection holes 20212 on the second side plate. The eighth connection holes 20212 and the ninth connection holes 2013 are connected together by a fifth threaded assembly. In this application, the second back plate and the second side plate are detachably connected together by the fifth threaded assembly, making the connection structure more stable.

[0053] Figure 4 This is a top view of a superconducting magnet maglev train provided by an embodiment of this application. As Figure 4 shown, this application also provides a superconducting magnet maglev train, including: a GM refrigerator 1; an electromagnetic shielding device as described above, and the GM refrigerator 1 is arranged inside the inner shielding assembly 10; a train body 2; a mounting base 3, one end of the mounting base 3 is connected to the train body 2, and the other end of the mounting base 3 sequentially passes through the second through hole 2023 of the outer shielding assembly 20 and the first through hole 1023 of the inner shielding assembly 10 and then is connected to the back of the GM refrigerator 1.

[0054] The electromagnetic shielding device in the superconducting magnet maglev train provided by this application can effectively shield the static magnetic field and high-frequency alternating magnetic field harmonics in the back field, prevent the attenuation of the refrigeration effect of the GM refrigerator caused by the AC loss inside the metal components in the refrigerator, and improve the service life of the GM refrigerator. Since the superconducting magnet maglev train includes the electromagnetic shielding device, it also has the same effect as the above electromagnetic shielding device, which will not be elaborated here.

[0055] It should be noted that the components such as screws and threaded components used in this application are all non-magnetic.

[0056] During use:

[0057] First, install the inner shielding component 10: First, install the first backplane component 102, set the first backplane 1021 and the first bushing 1022 on the mounting base 3, then move the first bushing 1022 upward so that the outer wall of the mounting base 3 fits with the first through hole 1023, and then connect the first backplane 1021 and the first bushing 1022 together with screws; then install the first housing component 101, and connect the fourth connection hole 10212 on the second extension 10211 and the fifth connection hole 1013 on the first side plate together through the third threaded component; finally, install the first top plate 103, and connect the second connection hole 10311 on the first extension 1031 and the third connection hole 1012 on the first side plate together through the second threaded component. In addition, the first top plate 103 can also be threadedly connected to the top of the first backplane 1021 to further stabilize the connection structure.

[0058] Then, install the outer shielding component 20: First, install the second backplane component 202, set the second backplane 2021 and the second bushing 2022 on the mounting base 3, then move the second bushing 2022 upward so that the outer wall of the mounting base 3 fits with the second through hole 2023, and then connect the second backplane 2021 and the second bushing 2022 together with screws; then install the second housing component 201, and connect the first connecting piece 1011 and the first connection hole 2011 together through the first threaded component, and connect the eighth connection hole 20212 on the fourth extension 20211 and the ninth connection hole 2013 on the second side plate together through the fifth threaded component; finally, install the second top plate 203, and connect the sixth connection hole 20311 on the third extension 2031 and the seventh connection hole 2012 on the second side plate together through the fourth threaded component. In addition, the second top plate 203 can also be threadedly connected to the top of the second backplane 2021 to further stabilize the connection structure.

[0059] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0060] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0061] In the present application, unless otherwise clearly specified and defined, terms such as "install", "connect", "couple", "fix", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the connection inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0062] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0063] 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 equivalent technologies, the present application also intends to include these changes and modifications.

Claims

1. An electromagnetic shielding device for a GM refrigerator, which is used in cooperation with a GM refrigerator (1), and is characterized in that, The electromagnetic shielding device includes: an inner shielding component (10) and an outer shielding component (20) sleeved on the outer wall of the inner shielding component (10), the inner shielding component (10) being connected to the outer shielding component (20); the inner shielding component (10) is made of permalloy, and the outer shielding component (20) is made of aluminum alloy with an aluminum coating on its surface; During use, a GM refrigerator (1) is arranged inside the inner shielding component (10), and the inner shielding component (10) and the outer shielding component (20) are used to shield the magnetic field outside the GM refrigerator (1).

2. The electromagnetic shielding device for GM refrigerator according to claim 1, characterized in that, The inner shielding component (10) includes: a first housing component (101), including a first side plate and a first bottom plate, the first side plate having a first opening, and the first bottom plate being connected to the bottom of the first side plate; a plurality of first connectors (1011) for connecting with the outer shielding component (20) are arranged on the outer wall of the first side plate; a first back plate component (102), connected to the first opening of the first side plate, the first back plate component (102) including a first back plate (1021) and a first ferrule (1022) connected below the first back plate (1021); a first groove is provided at the bottom of the first back plate (1021), and a second groove is provided at the top of the first ferrule (1022), and the first groove and the second groove are combined to form a first through hole (1023); a first top plate (103), connected to the top of the first side plate.

3. The electromagnetic shielding device for GM refrigerator according to claim 2, wherein The outer shielding component (20) includes: a second housing component (201), including a second side plate and a second bottom plate, the second side plate having a second opening, and the second bottom plate being connected to the bottom of the second side plate; a first connection hole (2011) is provided at a position corresponding to the first connector (1011) on the second side plate, and the first connector (1011) and the first connection hole (2011) are connected together by a first threaded component; a second back plate component (202), connected to the second opening of the second side plate, the second back plate component (202) including a second back plate (2021) and a second ferrule (2022) connected below the second back plate (2021); a third groove is provided at the bottom of the second back plate (2021), and a fourth groove is provided at the top of the second ferrule (2022), and the third groove and the fourth groove are combined to form a second through hole (2023); a second top plate (203), connected to the top of the second side plate.

4. The electromagnetic shielding device for GM refrigerator according to claim 3, characterized in that, The cross section of the first side plate is a pentagonal structure with an opening; The first top plate (103) is a hexagonal structure, and first extension parts (1031) extend from the edges of the first top plate (103) towards the bottom, and the first extension parts (1031) wrap around the outer sides of the top of the first side plate and the outer side of the top of the first back plate (1021); At least one second connection hole (10311) is provided at a position on the first extension part (1031) corresponding to the top of the first side plate. A third connection hole (1012) is provided at a position on the top of the first side plate corresponding to the second connection hole (10311). The second connection hole (10311) and the third connection hole (1012) are connected together by a second threaded component.

5. The electromagnetic shielding device for a GM refrigerator according to claim 4, characterized in that, Second extension parts (10211) extend inwardly on both sides of the first back plate (1021). A fourth connection hole (10212) is provided on the second extension part (10211). A fifth connection hole (1013) is provided at a position on the first side plate corresponding to the fourth connection hole (10212). The fourth connection hole (10212) and the fifth connection hole (1013) are connected together by a third threaded component.

6. The electromagnetic shielding device for GM refrigerator according to claim 4 or 5, characterized in that, In the pentagonal structure of the first side plate, there are a total of four inner angles, and each inner angle is 135°.

7. The electromagnetic shielding device for GM refrigerator according to claim 6, wherein The cross-section of the second side plate is a pentagonal structure with an opening; The second top plate (203) is a hexagonal structure. Third extension parts (2031) extend downward from the edges of the second top plate (203). The third extension parts (2031) wrap around the outer sides of the top of the second side plate and the outer side of the top of the second back plate (2021). At least one sixth connection hole (20311) is provided at a position on the third extension part (2031) corresponding to the top of the second side plate. A seventh connection hole (2012) is provided at a position on the top of the second side plate corresponding to the sixth connection hole (20311). The sixth connection hole (20311) and the seventh connection hole (2012) are connected together by a fourth threaded component.

8. The electromagnetic shielding device for GM refrigerator according to claim 7, characterized in that, Fourth extension parts (20211) extend inwardly on both sides of the second back plate (2021). An eighth connection hole (20212) is provided on the fourth extension part (20211). A ninth connection hole (2013) is provided at a position on the second side plate corresponding to the eighth connection hole (20212). The eighth connection hole (20212) and the ninth connection hole (2013) are connected together by a fifth threaded component.

9. The electromagnetic shielding device for GM refrigerator according to claim 7 or 8, characterized in that, In the pentagonal structure of the second side plate, there are a total of four inner angles, and each inner angle is 135°.

10. A superconducting magnetically levitated train, characterized in that, Comprising: GM refrigerator (1); The electromagnetic shielding device according to claim 9, wherein the GM refrigerator (1) is disposed inside the inner shielding component (10); Train body (2); Installation base (3), one end of the installation base (3) is connected to the train body (2), and the other end of the installation base (3) sequentially passes through the second through hole (2023) and the first through hole (1023) and then is connected to the back of the GM refrigerator (1).

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