An embedded connection type magnetic field shielding cylinder connected by an inner layer ring

Abstract

An embedded connection type magnetic field shielding cylinder connected by an inner layer collar, which relates to the field of magnetic field shielding of components. The present invention is to solve the problems of difficulty in maintaining material uniformity, difficulty in controlling shape changes, and loose and loose connections in the manufacturing process of existing long shielding cylinders, which leads to magnetic leakage. The present invention includes a base shielding cylinder, the base shielding cylinder includes N shielding cylinder bodies (1) and N-1 inner layer collars (2), wherein the shielding cylinder body (1) includes two end cylinders (1-1) and multiple middle cylinders (1-2), and the wall thickness and aperture of the end cylinders (1-1) and the middle cylinder (1-2) are the same; the inner layer collar (2) is installed on the inner side wall of the connection between two adjacent middle cylinders (1-2), and a middle cylinder unit is formed; the inner layer collar (2) is installed on the inner side wall of the connection between the two ends of the middle cylinder unit and the end cylinder (1-1). The present invention is used for magnetic field shielding.

Description

Technical Field

[0001] The invention relates to a magnetic field shielding cylinder, in particular to an embedded connection type magnetic field shielding cylinder connected by an inner sleeve ring, belonging to the field of magnetic field shielding. Background Art

[0002] As an important device in the field of electromagnetic shielding, magnetic field shielding tubes are constantly innovating under the impetus of scientific and technological development, presenting more efficient designs and extensive application value. This device is based on high magnetic permeability materials, and its main purpose is to isolate the interference of external magnetic fields on internal sensitive equipment and ensure the normal operation of the equipment. Its role covers a wide range of fields from electronic equipment, medical equipment to communication systems, providing a stable magnetic field environment for various key systems.

[0003] The working principle of the magnetic field shielding tube is based on the unique properties of high magnetic permeability materials, such as iron, nickel, cobalt, etc. These materials show excellent magnetic permeability under the action of external magnetic field, that is, they have strong ability to attract and guide magnetic fields. When the external magnetic field invades the magnetic field shielding tube, the magnetic field will be attracted into the material by the high magnetic permeability material, forming a kind of magnetic field "barrier". This "barrier" effectively isolates the influence of the external magnetic field on the internal equipment, ensuring that the equipment works in an extremely weak and relatively stable electromagnetic environment.

[0004] The technological innovation of magnetic field shielding tubes in the field of electronic equipment is reflected in their more efficient adaptability to complex electromagnetic environments. The main function of magnetic field shielding tubes is to protect internal equipment from interference from external magnetic fields. In electronic equipment, even tiny electromagnetic interference may cause equipment errors, data distortion and other problems. Therefore, it is particularly important to ensure that the equipment operates in a stable electromagnetic environment. In communication systems, especially in key areas such as important communications, magnetic field shielding tubes play a vital role. Communication equipment needs to maintain reliable communication in various environments, and external magnetic fields may cause communication interference and signal loss. Through the role of magnetic field shielding tubes, communication equipment is protected from external electromagnetic interference, ensuring the stability and security of communication. Through its special material properties and structure, magnetic field shielding tubes isolate electromagnetic interference outside the equipment, providing a highly stable operating environment for the equipment.

[0005] In general, as a key device in the field of electromagnetic protection, the technical innovation of magnetic field shielding tubes has shown great potential in various application fields. The continuously improved magnetic field shielding technology not only provides a solid foundation for the stable operation of equipment, but also promotes the technological progress and development of related industries. Its application in electronic equipment, medical equipment, communication systems and other fields has injected more sustainable and innovative power into the scientific and technological development of human society and provided a solid guarantee for the steady development of science and technology.

[0006] However, for some application areas, the traditional magnetic field shielding tube cannot meet the requirements at present. For example, in large-scale high-precision scientific research instruments, the protection requirements for electromagnetic interference are more stringent. In these scenarios, it is necessary to build a long shielding tube to ensure the normal operation and high-precision measurement of the equipment. However, due to the limitations of the forging process, the traditional direct forging method has encountered some difficulties in manufacturing long shielding tubes. The size of the long shielding tube is large, and direct forging may lead to problems such as difficulty in maintaining material uniformity and difficulty in controlling shape changes, thereby affecting the overall performance of the shielding tube. If the traditional welding method is used to connect the shielding tubes, it will bring about the problem of loose and loose connection, resulting in the leakage of external magnetic fields into the inside of the shielding tube, reducing the shielding effect, deviating from the expected design goals, and making it impossible to carry out relevant experiments in the shielding tube.

[0007] In summary, in the existing manufacturing process of long shielding tubes, there are problems such as difficulty in maintaining uniformity, difficulty in controlling shape changes, and loose and loose connections, which lead to magnetic flux leakage. Summary of the invention

[0008] The purpose of the present invention is to solve the problems of difficulty in maintaining material uniformity, difficulty in controlling shape changes, and loose and loose connections in the manufacturing process of the existing long shielding tube, which leads to magnetic flux leakage. Further, an embedded connection type magnetic field shielding tube connected by an inner layer ring is provided.

[0009] The technical solution of the present invention is: an embedded connected magnetic field shielding tube connected by an inner layer ring, which includes a base shielding tube, the base shielding tube includes N shielding tube bodies and N-1 inner layer rings, wherein the shielding tube body includes two end tubes and multiple middle tubes, and the wall thickness and aperture of the end tube and the middle tube are the same; the inner layer ring is installed on the inner side wall of the connection between two adjacent middle tubes, and a middle tube unit is formed; the inner layer ring is installed on the inner side wall of the connection between the two ends of the middle tube unit and the end tube.

[0010] Furthermore, the middle cylinder is provided with rows of observation holes for placing objects along its axial direction, and the two end portions of the middle cylinder are provided with a plurality of connection holes along the circumferential direction.

[0011] Preferably, the number of rows of the observation holes for placing objects is one row, two rows, three rows, or four rows, and the number of the observation holes for placing objects in each row is 2, 3, or 4.

[0012] Preferably, the middle cylinder has multiple rows of support holes along its axial direction, and the number of support holes in each row is 3 or 4.

[0013] Furthermore, the inner side wall of the connection between two adjacent middle cylinders is tightly attached to and bolted to the inner sleeve ring.

[0014] Furthermore, a gap is left between the inner side wall and the inner ring at the connection of two adjacent middle cylinders and they are bolted, and a limiting sleeve is sleeved on the bolt between the middle cylinder and the inner ring to support the middle cylinder and the inner ring.

[0015] Furthermore, it also includes at least one layer of nested shielding cylinders, wherein the structure of the nested shielding cylinders is the same as that of the base shielding cylinders;

[0016] When the number of nested shielding tubes is one layer, the nested shielding tubes are embedded in or covered on the base shielding tube;

[0017] When the number of nested shielding tubes is multiple layers, the multiple layers of nested shielding tubes are embedded or jacketed on the base shielding tube at equal intervals.

[0018] Furthermore, the multiple layers of nested shielding cylinders are connected by bolts that sequentially pass through the supporting holes on the middle cylinder.

[0019] Furthermore, a limiting sleeve is sleeved on the bolts between the multiple layers of nested shielding tubes to achieve equal spacing between the bolts or sleeves on the base shielding tubes.

[0020] Furthermore, the number of the nested shielding cylinders is 2 layers, 3 layers, 4 layers, or 5 layers.

[0021] Compared with the prior art, the present invention has the following effects:

[0022] 1. The middle cylinder 1-2 of the base shielding cylinder of the present invention can be connected according to actual use requirements. The shielding cylinder body and the inner ring are made of the same material, and the connection part is a laminated design, which ensures the magnetic field shielding effect, and the connection method is simple and reliable, thereby forming a large and long shielding cylinder. The problem of difficulty in maintaining uniformity and controlling shape changes caused by the limitations of traditional forging technology in the production process of large and long shielding cylinders is overcome, and the constraints caused by the challenges of size and shape are solved.

[0023] 2. The present invention overcomes the problems of loose and loose connection caused by traditional welding methods. By introducing the connection method of the inner ring, the stability and tightness of the connection are effectively improved, thereby ensuring that the long shielding tube can more reliably resist external electromagnetic interference during use, so that it can maintain excellent performance in various extreme environments.

[0024] 3. The present invention provides a shielding tube structure composed of a nested shielding tube and a nested base shielding tube, which solves the technical problem of serious magnetic leakage of long shielding tubes, aims to eliminate magnetic leakage, improve the magnetic field shielding effect, and ensure that the long shielding tube can maintain the stability of the internal electromagnetic environment to the greatest extent in practical applications, so as to meet the higher requirements for electromagnetic shielding in key fields such as electronic equipment, medical equipment and communication systems.

[0025] 4. The present invention extends the shielding range. By connecting multiple shielding cylinders together to form a longer shielding system, the shielding range is extended and helps to form a larger confined space, which is very useful for applications that need to protect a larger area from external magnetic field interference.

[0026] 5. The present invention improves the overall shielding performance. Connecting multiple shielding tubes can work together to improve the shielding effectiveness of the entire system. In addition, the presence of nested shielding tubes can provide additional magnetic field shielding, and connecting multiple layers of shielding tubes together through the base shielding tube forms a more closed system, which helps to reduce or prevent external magnetic fields from penetrating into the connected parts.

[0027] 6. The present invention improves the customizability of the system. A system formed by connecting multiple shielding cylinders can increase the customizability of the system. Users can choose the number and arrangement of connected shielding cylinders according to specific needs to meet the needs of different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the base shielding tube of the present invention when it is connected in a close-fitting manner (specific implementation method five).

[0029] Figure 2 yes Figure 1 Axonometric diagram in horizontal arrangement.

[0030] Figure 3 yes Figure 1 Axonometric diagram in vertical arrangement.

[0031] Figure 4 It is a schematic diagram of the overall structure of the base shielding tube of the present invention when it is connected using the support type (specific implementation method six).

[0032] Figure 5 yes Figure 4 Axonometric diagram in horizontal arrangement.

[0033] Figure 6 yes Figure 4 Axonometric diagram in vertical arrangement.

[0034] Figure 7 It is an axonometric diagram when the end cylinder is arranged horizontally.

[0035] Figure 8 It is an axonometric diagram when the end cylinder is arranged vertically.

[0036] Fig. 9 It is an axonometric diagram when the middle cylinder is arranged horizontally.

[0037] Fig.10 This is an axonometric diagram when the middle cylinder is arranged vertically.

[0038] Fig.11 It is an axonometric diagram when the inner ring is arranged horizontally.

[0039] Fig.12 It is an axonometric diagram when the inner sleeve is arranged vertically.

[0040] Fig.13 This is a schematic diagram of multiple middle cylinder units before assembly.

[0041] Fig.14 It is a schematic diagram of multiple layers of nested shielding tubes being equally spaced and embedded or jacketed on a base shielding tube. DETAILED DESCRIPTION

[0042] Specific implementation method 1: Combination Figures 1 to 13 To illustrate this embodiment, this embodiment includes a basic shielding tube, which includes N shielding tube bodies 1 and N-1 inner rings 2, wherein the shielding tube body 1 includes two end tubes 1-1 and multiple middle tubes 1-2, and the wall thickness and aperture of the end tubes 1-1 and the middle tubes 1-2 are the same; the inner ring 2 is installed on the inner side wall of the connection between two adjacent middle tubes 1-2, and a middle tube unit is formed; the inner ring 2 is installed on the inner side wall of the connection between the two ends of the middle tube unit and the end tube 1-1.

[0043] This embodiment aims at the special requirements for the manufacture of long shielding tubes that cannot be met by traditional forging processes. In order to meet this demand, the present invention proposes a method of connecting multiple shielding tubes based on inner layer support, aiming to break the limitation of the forging process of large long shielding tubes and provide a more flexible and reliable solution for long-distance magnetic field shielding.

[0044] A single-layer base shielding tube provided in this embodiment is used to shield the magnetic field. In an environment with a relatively strong magnetic field, it can be used as a basis to set a multi-layer shielding tube inside or outside to increase the magnetic field shielding effect.

[0045] The cylindrical shape with openings at both ends of the base shielding tube in this embodiment facilitates the placement of electrical equipment components inside the cylindrical opening ends. In actual use, it is also convenient to connect the two end portions of the base shielding tube with external components, making it more flexible to use and able to meet a variety of usage environments.

[0046] As a preferred implementation, the base shielding tube in this implementation can also be determined according to actual needs to determine whether the base shielding tube is opened at both ends or at one end.

[0047] The material of the shielding cylinder body 1 in this embodiment is a high magnetic permeability material, such as Permalloy, ferrite, etc. In order to ensure the shielding effect of the magnetic field, the material of the inner ring 2 is the same as that of the shielding cylinder body 1 .

[0048] Specific implementation method 2: Combination Figures 9 and 10 To describe this embodiment, the middle cylinder 1-2 of this embodiment is provided with rows of observation holes 1-3 for placing objects along its axial direction, and both end portions of the middle cylinder 1-2 are provided with a plurality of connection holes 1-4 along the circumferential direction.

[0049] In this way, the observation holes 1-3 provided in the present embodiment provide conditions for placing precision equipment (such as sensors) inside the shielding room or observing the situation inside the shielding tube; the connection holes 1-4 in the present embodiment are connected to the single-side holes of the inner ring 2, and the holes on the other side of the inner ring 2 are connected to the connection holes 1-4 on the other middle cylinder 1-2, thereby building and connecting multiple middle cylinders 1-2 into a long shielding tube. Fig. 9 and Fig.10 There is a circle of connecting holes on both sides of the shielding tube, because the shielding tube will be used as a non-two-end unit of a large long shielding tube. Other components and connection relationships are the same as those in the first specific implementation method.

[0050] Specific implementation method three: Combination Figures 9 and 10 To illustrate this embodiment, the number of rows of the storage observation holes 1-3 of this embodiment is one row, two rows, three rows, or four rows, and the number of the storage observation holes 1-3 in each row is 2, 3, or 4.

[0051] In order to ensure the effect of shielding the magnetic field, under the premise of ensuring that the internal components or equipment of the middle cylinder 1-2 can be observed, the number of rows of the observation holes 1-3 for placing objects is as small as possible, preferably two rows of observation holes 1-3 arranged oppositely are used, so as to facilitate viewing the interior of the middle cylinder 1-2 in two opposite directions, and the number of the observation holes 1-3 for placing objects is preferably 3. The other components and connection relationships are the same as those in the second specific embodiment.

[0052] Specific implementation method four: Combination Figures 9 and 10 To describe this embodiment, the middle cylinder 1-2 of this embodiment has multiple rows of support holes 1-5 along its axial direction, and the number of support holes 1-5 in each row is 3 or 4.

[0053] In this way, the support holes 1-5 are set to provide space for the support connection between the multi-layer shielding cylinders (that is, the multi-layer nested shielding cylinders recorded in the seventh embodiment are equally spaced and embedded or jacketed on the base shielding cylinder). In some application cases, the shielding effect of the single-layer shielding cylinder cannot meet the requirements, and multi-layer shielding is required. The support holes 1-5 play a role at this time. The other components and connection relationships are the same as those in the third embodiment.

[0054] Specific implementation method five: Combination Figures 1 to 3 To explain this embodiment, the inner side wall of the connection between two adjacent middle cylinders 1 - 2 of this embodiment is tightly attached to and bolted to the inner layer ring 2 .

[0055] Such a configuration is a close-fitting connection mode, which is simple and reliable. When performing multi-layer shielding, the distance between the nested shielding tube and the base shielding tube can be determined by the length of the limit sleeve on the bolt, which saves more space and provides as much space as possible for the innermost layer of the multi-layer nested shielding tube. The other components and connection relationships are the same as any one of the specific implementation modes one to four.

[0056] Specific implementation method six: Combination Figures 4 to 6 To illustrate this embodiment, a gap is left between the inner side wall and the inner layer ring 2 at the connection of two adjacent middle cylinders 1-2 of this embodiment and they are bolted together, and a limiting sleeve is mounted on the bolt between the middle cylinder 1-2 and the inner layer ring 2 to support the middle cylinder 1-2 and the inner layer ring 2.

[0057] This arrangement is a support type connection mode, that is, there is a gap between the inner ring 2 and the middle cylinder 1-2, and this gap is set according to actual use requirements. In order to ensure that the connection between the two is more secure, the limit sleeve on the bolt is tightened by the nuts at both ends of the bolt to achieve a secure connection. Other components and connection relationships are the same as any one of the specific implementation methods one to five.

[0058] The supporting connection mode of this embodiment has a relatively large gap with the nested shielding cylinders, so that the multi-layer shielding effect is optimal.

[0059] Specific implementation method seven: Combination Figures 1 to 6 and Fig.14 To illustrate this embodiment, this embodiment further comprises at least one layer of nested shielding cylinders, the structure of the nested shielding cylinders being the same as that of the base shielding cylinders;

[0060] When the number of nested shielding tubes is one layer, the nested shielding tubes are embedded in or covered on the base shielding tube;

[0061] When the number of nested shielding tubes is multiple layers, the multiple layers of nested shielding tubes are embedded or jacketed on the base shielding tube at equal intervals.

[0062] In this way, the present embodiment records a magnetic field shielding tube formed when a layer of nested shielding tube is set or embedded in a base shielding tube, which is applicable to both supporting type and close-fitting type base shielding tubes; when multiple layers of nested shielding tubes are set or embedded in a base shielding tube, the multiple layers of nested shielding tubes are set or embedded in the base shielding tube at the same time, which makes assembly more flexible and convenient for mass production. Other components and connection relationships are the same as any one of the specific embodiments one to six.

[0063] Specific implementation method eight: Combination Figures 1 to 6 and Fig.14 To illustrate this embodiment, the multi-layer nested shielding cylinders of this embodiment are connected by bolts that sequentially pass through the supporting holes 1 - 5 on the middle cylinder 1 - 2.

[0064] With this arrangement, when the middle cylinder 1-2 on the multi-layer nested shielding cylinder and the middle cylinder 1-2 on the base shielding cylinder need to be connected, the support holes 1-5 on the same axis can be connected with one bolt. Other components and connection relationships are the same as any one of the specific implementations one to seven.

[0065] Specific implementation method nine: Combination Figures 1 to 6 and Fig.14 To illustrate this embodiment, a limiting sleeve is sleeved on the bolts between the multi-layer nested shielding cylinders of this embodiment to achieve equal spacing between the bolts or sleeves on the base shielding cylinders.

[0066] Such arrangement facilitates to ensure the connection between the multi-layer middle cylinders 1-2 is stable, and also plays a supporting role. Other components and connection relationships are the same as any one of the specific implementation modes 1 to 8.

[0067] Specific implementation method ten: Combination Figures 1 to 6 and Fig.14 The present embodiment is described. The number of nested shielding tubes in the present embodiment is 2 layers, 3 layers, 4 layers, or 5 layers.

[0068] Such an arrangement facilitates the selection of an appropriate number of nested shielding cylinders according to actual use requirements. Other components and connection relationships are the same as any one of the specific implementation modes 1 to 9.

[0069] Combination Figures 1 to 14 The working principle of the present invention is described:

[0070] The introduction of the long shielding tube of the present invention is also an innovation in magnetic field shielding technology. Compared with the traditional short shielding tube, the long shielding tube has unique advantages in shielding effect, scope of application and manufacturing cost. Its design is more flexible and can adapt to equipment of various sizes and shapes to meet the diverse needs of shielding tubes in different fields. Especially in applications where equipment within a long distance needs to be shielded, the long shielding tube becomes a more suitable choice.

[0071] In the future, magnetic field shielding cylinders are expected to play an important role in more fields. With the continuous development of electronic technology, medical technology and communication technology, the requirements for equipment stability and reliability will be further improved. As a key electromagnetic protection device, magnetic field shielding cylinders will continue to meet the growing application needs through technological innovation and process evolution.

[0072] In general, magnetic field shielding tubes play an indispensable role in the field of modern science and technology. As a precise barrier to protect against electromagnetic interference, they protect internal equipment from the adverse effects of external electromagnetics through the attraction and guidance of high magnetic permeability materials, providing a solid guarantee for the steady development of science and technology.

[0073] This invention introduces a long shielding tube as an innovation in magnetic field shielding technology. Compared with the traditional short shielding tube, the long shielding tube has unique advantages in many aspects. First, its shielding effect is more significant, and it can effectively isolate the interference of the external magnetic field on the internal equipment. Secondly, the design of the long shielding tube is more flexible, which can adapt to the different sizes and shapes of various equipment, meeting the requirements of different fields for the diversity of shielding tubes. This makes the long shielding tube a more suitable choice for applications that require shielding of equipment over a long distance. A key innovation is that the long shielding tube is suitable for equipment shielding over a long distance. This becomes crucial in many application scenarios, such as large industrial equipment, medical imaging equipment, etc. The long shielding tube can not only provide a wider coverage, but also ensure that a uniform and efficient magnetic field shielding effect is maintained throughout the length of the equipment. In the future, the magnetic field shielding tube is expected to play an important role in more fields. With the continuous advancement of electronic technology, medical technology and communication technology, the requirements for equipment stability and reliability will be further improved. As a key electromagnetic protection device, the magnetic field shielding tube will meet the growing application needs through continuous technological innovation and process evolution. In terms of the principle of the magnetic field shielding tube, its core is still the use of high magnetic permeability materials. These materials can attract and guide the surrounding magnetic field, effectively guiding the external magnetic field into the structure of the shielding tube to prevent it from having an adverse effect on the internal equipment. Therefore, the magnetic field shielding tube is not only a shielding device, but also a key tool for achieving electromagnetic protection through scientific principles. As a precision barrier, it provides a reliable guarantee for the sustainable development of science and technology.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An embedded magnetic field shielding cylinder connected by an inner ring, characterized in that: It comprises a base shielding cylinder and a nested shielding cylinder, wherein the base shielding cylinder comprises N shielding cylinder bodies (1) and N-1 inner rings (2), wherein the shielding cylinder body (1) comprises two end cylinder bodies (1-1) and a plurality of middle cylinder bodies (1-2), and the wall thickness and aperture of the end cylinder bodies (1-1) and the middle cylinder bodies (1-2) are the same; An inner sleeve (2) is installed on the inner side wall of the connection between two adjacent middle cylinders (1-2), and a middle cylinder unit is formed; inner sleeves (2) are installed on the inner side wall of the connection between the two ends of the middle cylinder unit and the end cylinder (1-1); The inner side wall of the connection between two adjacent middle cylinders (1-2) and the inner sleeve ring (2) are tightly attached and bolted; The shielding tube body (1) and the inner ring (2) are made of the same material, and the connection part thereof is designed in a stacked manner to form a large and long shielding tube; A limiting sleeve is sleeved on the bolt between the middle cylinder (1-2) and the inner sleeve (2) to support the middle cylinder (1-2) and the inner sleeve (2); a longer shielding system is formed by connecting multiple shielding cylinders together; the structure of the nested shielding cylinder is the same as that of the base shielding cylinder; When the number of nested shielding tubes is one layer, the nested shielding tubes are embedded in or covered on the base shielding tube; When the number of nested shielding tubes is multiple layers, the multiple layers of nested shielding tubes are embedded or jacketed on the base shielding tube at equal intervals.

2. The embedded magnetic field shielding cylinder connected by an inner ring according to claim 1, characterized in that: The middle cylinder (1-2) is provided with rows of observation holes (1-3) for placing objects along its axial direction, and the two end portions of the middle cylinder (1-2) are provided with a plurality of connection holes (1-4) along the circumferential direction.

3. The embedded magnetic field shielding cylinder connected by an inner ring according to claim 2, characterized in that: The number of rows of the observation holes (1-3) for placing objects is one row, two rows, three rows or four rows, and the number of the observation holes (1-3) for placing objects in each row is two, three or four.

4. The embedded magnetic field shielding cylinder connected by an inner ring according to claim 3, characterized in that: The middle cylinder (1-2) is provided with a plurality of rows of support holes (1-5) along the axial direction thereof, and the number of the support holes (1-5) in each row is 3 or 4.

5. The embedded magnetic field shielding cylinder connected by an inner ring according to claim 4, characterized in that: The multi-layer nested shielding cylinders are connected by bolts which pass through the supporting holes (1-5) on the middle cylinder body (1-2) in sequence.

6. The embedded magnetic field shielding cylinder connected by an inner ring according to claim 5, characterized in that: A limiting sleeve is sleeved on the bolts between the multiple layers of nested shielding tubes to achieve equal spacing between the bolts or sleeves on the base shielding tubes.

7. The embedded magnetic field shielding cylinder connected by an inner ring according to claim 6, characterized in that: The number of nested shielding tubes is 2 layers, 3 layers, 4 layers or 5 layers.

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