Heat shield, cryostat and magnetic resonance apparatus

Abstract

This invention relates to a heat shielding layer, a cryogenic holder, and a magnetic resonance imaging (MRI) device. The heat shielding layer includes: a first inner cylinder; a first outer cylinder sleeved on the outside of the first inner cylinder; and two first sealing plates, respectively disposed at both ends of the first inner cylinder. The first sealing plates connect the ends of the first inner cylinder and the ends of the first outer cylinder, forming an accommodating space. Each first sealing plate includes multiple connecting plates extending radially, and the multiple connecting plates are spliced ​​together to form the first sealing plate. By using multiple connecting plates to form the first sealing plate, the shape and size of the connecting plates are significantly smaller than the first sealing plate, thereby reducing the size of the mold, lowering the difficulty of the molding process, shortening the processing cycle, facilitating molding and assembly, and reducing costs.

Description

Technical Field

[0001] This invention relates to the field of magnetic resonance system technology, and in particular to a heat shielding layer, a cryogenic holder, and a magnetic resonance device. Background Technology

[0002] Currently, in typical superconducting magnet assemblies, multiple solenoid coils are wound on a metal winding frame and finally encapsulated in a hollow cylindrical cryogenic holder. To isolate external heat leakage and maintain the internal cryogenic environment, the cryogenic holder is typically assembled from multiple concentric cylindrical cavities, consisting of an inner container, an intermediate thermal shielding layer, and an outer vacuum container from the inside out. The thermal shielding layer plays a crucial role in reducing heat conduction and radiation from the external environment; it is generally made of thermally conductive aluminum alloy, and the main components are connected using methods such as welding.

[0003] For the end caps in the inner container, outer vacuum container, and heat shield layer, they are usually circular flat plates that can be directly cut and formed, making manufacturing and processing convenient. However, for the heat shield layer, the connection between the end cap and the cylinder is a right-angle corner structure. According to the principles of mechanics of materials and plate and shell theory, significant edge stress will occur at the connection between the planar annular end cap and the cylinder. Therefore, in some magnet designs, end caps with special shapes are often designed, such as using folded edges, rounded corners, or curved surfaces on the edges or center of the end cap, to reduce edge stress, thereby reducing the thickness of the end cap and cylinder and lowering costs.

[0004] However, manufacturing the aforementioned annular heads with smooth transition structures is relatively difficult, typically requiring spinning or stamping processes. Spinning or stamping large heads first necessitates the fabrication of large molds and tooling, which are expensive and have long processing cycles. Furthermore, since metal sheet stamping usually involves springback, a single stamping design often fails to meet requirements, necessitating multiple mold revisions, further increasing costs. Additionally, the heat shield layer is generally made of aluminum alloy, which has poor deformation resistance, making the spinning or stamping process even more difficult to control. Summary of the Invention

[0005] Therefore, it is necessary to provide a heat shielding layer, cryogenic retainer, and magnetic resonance equipment that can reduce the difficulty and cost of manufacturing the current annular head, in order to address the problems of high manufacturing difficulty and high cost.

[0006] A heat shielding layer, comprising:

[0007] First inner cylinder;

[0008] The first outer cylinder is sleeved on the outside of the first inner cylinder; and

[0009] Two first sealing plates are respectively disposed at both ends of the first inner cylinder. The first sealing plates connect the end of the first inner cylinder and the end of the first outer cylinder and form an accommodating space. The first sealing plate includes multiple connecting plates that extend in the radial direction. The multiple connecting plates are spliced ​​together to form the first sealing plate.

[0010] In one embodiment, the connecting plate includes a connecting body, a first connecting edge, and a second connecting edge. The connecting body extends in a radial direction, and the first connecting edge and the second connecting edge are disposed at opposite ends of the connecting body. The first connecting edge is connected to the first inner cylinder, and the second connecting edge is connected to the first outer cylinder.

[0011] When two adjacent connecting plates are connected, the edge of the connecting body, the edge of the first connecting edge, and the edge of the second connecting edge of one of the connecting plates are connected to the edges of the connecting body, the edge of the first connecting edge, and the edge of the second connecting edge of the adjacent connecting plate.

[0012] In one embodiment, the first connecting edge, the connecting body, and the second connecting edge are coplanar;

[0013] Alternatively, the first connecting edge and / or the second connecting edge may have a folded edge, rounded corner, or curved surface.

[0014] Alternatively, the connecting body may be curved and / or planar.

[0015] In one embodiment, the first sealing plate further includes a connecting component disposed on the edge of the connecting plate, and two adjacent connecting plates are spliced ​​together through the connecting component.

[0016] In one embodiment, one side edge of the connecting plate has a mating portion and the other side edge of the connecting plate has a connecting portion. When two adjacent connecting plates are connected, the mating portion and the connecting portion are mated and connected.

[0017] The mating part and the connecting part are either a raised groove structure or a snap-fit ​​structure.

[0018] In one embodiment, two adjacent connecting plates are connected by adhesive or welding.

[0019] In one embodiment, at least one of the connecting plates has a recess that is recessed toward the inside of the heat shield layer;

[0020] When at least two of the connecting plates have the recessed portion, two adjacent recessed portions are spaced apart.

[0021] In one embodiment, the thermal conductivity of the material of the first outer cylinder is greater than that of the materials of the first inner cylinder and the first sealing plate.

[0022] A cryogenic holder includes an inner container, an outer container, and a heat shield layer. The outer container has a hollow magnetic hole. The inner container is disposed within the outer container and together with the outer container forms an installation space. The heat shield layer is disposed within the installation space. The heat shield layer comprises:

[0023] First inner cylinder;

[0024] The first outer cylinder is sleeved on the outside of the first inner cylinder; and

[0025] Two first sealing plates are respectively disposed at both ends of the first inner cylinder. The first sealing plates connect the end of the first inner cylinder and the end of the first outer cylinder and form a receiving space.

[0026] Wherein, at least one of the first sealing plates includes a plurality of connecting plates, the connecting plates extending in a radial direction, and the plurality of connecting plates being spliced ​​together to form a ring-shaped first sealing plate.

[0027] A magnetic resonance imaging (MRI) device includes a cryogenic holder and a superconducting magnet assembly disposed within the cryogenic holder. The cryogenic holder includes an inner container, an outer container, and a heat shield layer. The outer container has a hollow magnet hole. The inner container is disposed within the outer container and together with the outer container forms an installation space. The heat shield layer is disposed within the installation space. The heat shield layer comprises:

[0028] First inner cylinder;

[0029] The first outer cylinder is sleeved on the outside of the first inner cylinder; and

[0030] Two first sealing plates are arranged in a ring and are respectively disposed at both ends of the first inner cylinder. The first sealing plates connect the end of the first inner cylinder and the end of the first outer cylinder and form a ring-shaped receiving space. At least one first sealing plate includes multiple connecting plates, which extend in a radial direction and are spliced ​​together to form a ring-shaped first sealing plate.

[0031] In one embodiment, the magnetic resonance device further includes:

[0032] A refrigerator is disposed in the cryogenic holder, and at least a portion of the cold electrode of the refrigerator is thermally coupled to the thermal shielding layer.

[0033] By adopting the above technical solution, the present invention has at least the following technical effects:

[0034] The present invention relates to a heat shielding layer, a cryogenic holder, and a magnetic resonance device. A first inner cylinder and a first outer cylinder are arranged radially from the center outwards. First sealing plates are respectively provided at both ends of the first inner cylinder. The first inner cylinder and the first outer cylinder are connected by annular first sealing plates, forming an annular receiving space capable of housing the inner container of the cryogenic holder. Each first sealing plate includes multiple connecting plates extending radially, which are spliced ​​together to form the annular first sealing plate. The heat shielding layer of the present invention uses multiple connecting plates to form the first sealing plate. The shape and size of the connecting plates are significantly smaller than the first sealing plate, effectively solving the problems of high manufacturing difficulty and cost of current annular end caps. This reduces the size of the mold, lowers the difficulty of the forming process, shortens the processing cycle, facilitates forming and assembly, and reduces costs. Furthermore, the use of multiple radially extending connecting plates to connect the first outer cylinder and the first inner cylinder in this heat shielding layer results in low thermal resistance between the first inner cylinder and the first outer cylinder, maintaining good thermal conductivity and thus ensuring the overall cooling performance of the cryogenic holder. Attached Figure Description

[0035] Figure 1 This is a cutaway schematic diagram of a superconducting magnet assembly installed in a cryogenic holder according to an embodiment of the present invention.

[0036] Figure 2 for Figure 1 The cut front view of the superconducting magnet assembly installed in the cryogenic holder is shown.

[0037] Figure 3 for Figure 1 A perspective view of one embodiment of the thermal shielding layer in the cryogenic holder shown;

[0038] Figure 4 for Figure 3 The diagram shows the connection between the heat shield layer and the refrigerator.

[0039] Figure 5 for Figure 1 A perspective view of another embodiment of the heat shielding layer in the cryogenic holder shown;

[0040] Figure 6 for Figure 1 A perspective view of another embodiment of the thermal shielding layer in the cryogenic holder shown.

[0041] Wherein: 100, heat shielding layer; 110, first inner cylinder; 120, first outer cylinder; 130, first sealing plate; 131, connecting plate; 1311, connecting body; 1312, first connecting edge; 1313, second connecting edge; 1314, recessed part; 132, connecting component; 200, outer container; 210, second inner cylinder; 220, second outer cylinder; 230, second sealing plate; 300, inner container; 310, third inner cylinder; 330, third outer cylinder; 400, superconducting magnet assembly; 500, refrigerator; 510, cold electrode. Detailed Implementation

[0042] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0048] See Figures 1 to 6 This invention provides a heat shielding layer 100. The heat shielding layer 100 is applied in a cryogenic holder, specifically located in the vacuum installation space between the inner container 300 and the outer container 200 of the cryogenic holder. The heat shielding layer 100 can isolate external heat leakage, maintain the internal low-temperature environment, prevent the superconducting magnet assembly 400 from entering a superconducting state, ensure the performance of the superconducting magnet assembly 400, and thus ensure the performance of the magnetic resonance imaging equipment.

[0049] Understandably, for current heat shielding layers, if the annular end cap is designed as a right-angle corner structure, it will cause large edge stress at the edge of the heat shielding layer. Therefore, the annular end cap is designed with a smooth transition structure. However, the manufacturing process and material limitations of the annular end cap with a smooth transition structure make the process difficult to form, and require a large mold, resulting in a long processing cycle, high manufacturing and mold repair costs, and inconvenience for production and processing.

[0050] During the actual operation of the superconducting magnet, the thermal shielding layer 100, as a primary thermal cutoff / isolation body, is connected to the 50K cold electrode of the magnetic resonance equipment's refrigerator. The thermal shielding layer 100 needs to maintain good thermal conductivity and a small temperature gradient at all points to reduce heat conduction and heat radiation to the inner container 300.

[0051] Therefore, the present invention provides a novel heat shielding layer 100. This heat shielding layer 100 can reduce the processing difficulty of the first sealing plate 130 at its end, reduce the size of the mold, shorten the processing cycle, facilitate molding and assembly, reduce costs, while maintaining good thermal conductivity to ensure the overall cooling performance of the cryogenic holder. The specific structure of the heat shielding layer 100 is described in detail below.

[0052] See Figures 1 to 6 In one embodiment, the heat shield layer 100 includes a first inner cylinder 110, a first outer cylinder 120, and two first sealing plates 130. The first outer cylinder 120 is sleeved on the outside of the first inner cylinder 110 and is coaxially arranged with the first inner cylinder 110. The two first sealing plates 130 are arranged in a ring and are respectively disposed at both ends of the first inner cylinder 110. The first sealing plates 130 connect the ends of the first inner cylinder 110 and the ends of the first outer cylinder 120 and form a ring-shaped receiving space. The first sealing plate 130 includes a plurality of connecting plates 131, which extend in a radial direction and are spliced ​​together to form the ring-shaped first sealing plate 130.

[0053] The first inner cylinder 110 is a hollow cylindrical body, and the first outer cylinder 120 is also a hollow cylindrical body, with the outer diameter of the first outer cylinder 120 being larger than the outer diameter of the first inner cylinder 110. The first inner cylinder 110 is installed inside the first outer cylinder 120, and the first inner cylinder 110 and the first outer cylinder 120 are coaxially arranged, forming an annular space between them. The first sealing plate 130 is annularly arranged and adapts to the annular space with openings at both ends.

[0054] Two first sealing plates 130 are respectively disposed at both ends of the first inner cylinder 110 and the first outer cylinder 120. One first sealing plate 130 connects one end of the first inner cylinder 110 and the first outer cylinder 120, and the other first sealing plate 130 connects the other end of the first inner cylinder 110 and the first outer cylinder 120. The two first sealing plates 130 can close the aforementioned annular space with openings at both ends. After the first sealing plates 130 connect the first inner cylinder 110 and the first outer cylinder 120, the first sealing plates 130, the first inner cylinder 110, and the first outer cylinder 120 form an annular receiving space, in which the inner container 300 of the cryogenic holder can be installed.

[0055] To reduce the processing difficulty of the first sealing plate 130, in this invention, the first sealing plate 130 includes multiple connecting plates 131. The connecting plates 131 extend radially and have a certain width circumferentially. The multiple connecting plates 131 are spliced ​​together circumferentially. Specifically, one side edge of one connecting plate 131 connects to one side edge of an adjacent connecting plate 131, and the other side edge of one connecting plate 131 connects to one side edge of another adjacent connecting plate 131, to form an annular first sealing plate 130.

[0056] In other words, the annular first sealing plate 130 is designed as multiple segmented connecting plates 131 in the circumferential direction. Compared to the overall first sealing plate 130, the connecting plates 131 are significantly smaller in size. The overall first sealing plate 130 can be formed simply by increasing the number of connecting plates 131 and splicing them together. Thus, when forming the first sealing plate 130, only multiple connecting plates 131 need to be processed, and then the multiple connecting plates 131 are spliced ​​together.

[0057] Because the connecting plate 131 is significantly smaller in size than the first sealing plate 130, the mold required for forming the connecting plate 131 is much smaller than the mold used for forming the first sealing plate 130. It is understandable that for forming molds, the larger the workpiece size, the larger the required mold size, which correspondingly increases the process difficulty. Therefore, this invention reduces the size of the connecting plate 131, thus reducing the size of the forming mold for the connecting plate 131. Compared to processing the first sealing plate 130 as a whole, producing the connecting plate 131 separately reduces the size of the forming mold, lowers the processing difficulty, reduces costs, and facilitates the production and processing of the connecting plate 131, thereby facilitating the forming of the first sealing plate 130. Furthermore, compared to processing the first sealing plate 130 as a whole, using multiple radially extending connecting plates 131 to connect the first outer cylinder 120 and the first inner cylinder 110 ensures that the heat transfer path between the first outer cylinder 120 and the first inner cylinder 110 is uninterrupted or has high thermal resistance.

[0058] The heat shielding layer 100 of this invention is formed by splicing multiple connecting plates 131 to form a first sealing plate 130. The shape and size of the connecting plates 131 are significantly smaller than those of the first sealing plate 130, effectively solving the problems of high difficulty and high cost in the current manufacturing process of annular heads. This reduces the size of the mold, lowers the difficulty of the forming process, shortens the processing cycle, facilitates forming and assembly, and reduces costs. At the same time, it can still maintain a low thermal resistance between the first outer cylinder 120 and the first inner cylinder 110, maintaining good thermal conductivity, thereby ensuring the overall cooling performance of the cryogenic holder.

[0059] See Figure 3 and Figure 4In one embodiment, the connecting plate 131 includes a connecting body 1311, a first connecting edge 1312, and a second connecting edge 1313. The connecting body 1311 extends radially, and the first connecting edge 1312 and the second connecting edge 1313 are disposed at opposite ends of the connecting body 1311. The first connecting edge 1312 is connected to the first inner cylinder 110, and the second connecting edge 1313 is connected to the first outer cylinder 120. When two adjacent connecting plates 131 are connected, the edges of the connecting body 1311, the first connecting edge 1312, and the second connecting edge 1313 of one connecting plate 131 are correspondingly connected to the edges of the connecting body 1311, the first connecting edge 1312, and the second connecting edge 1313 of the adjacent connecting plate 131.

[0060] For ease of description, the connecting plate 131 is divided into three parts radially. The connecting plate 131 includes a first connecting edge 1312, a connecting body 1311, and a second connecting edge 1313. The first connecting edge 1312 is provided at one end of the connecting body 1311, and the second connecting edge 1313 is provided at the other end. The first connecting edge 1312 is located at the inner edge of the connecting body 1311 in the radial direction, and the second connecting edge 1313 is located at the outer edge of the connecting body 1311 in the radial direction. The first connecting edge 1312 connects to the first inner cylinder 110, and the second connecting edge 1313 connects to the first outer cylinder 120. Optionally, the first connecting edge 1312, the connecting body 1311, and the second connecting edge 1313 are an integral structure. This ensures the structural strength of the connecting plate 131 and guarantees that the connecting plate 131 can reliably connect the first inner cylinder 110 and the first outer cylinder 120.

[0061] When two adjacent connecting plates 131 are connected, one side edge of the first connecting edge 1312 of one connecting plate 131 connects to one side edge of the first connecting edge 1312 of the adjacent connecting plate 131, one side edge of the connecting body 1311 of one connecting plate 131 connects to one side edge of the connecting body 1311 of the adjacent connecting plate 131, and one side edge of the second connecting edge 1313 of one connecting plate 131 connects to one side edge of the second connecting edge 1313 of the adjacent connecting plate 131. After multiple connecting plates 131 are spliced ​​together, a ring-shaped first sealing plate 130 can be formed.

[0062] See Figure 3 and Figure 4In one embodiment, the connecting body 1311 is fan-shaped, and the circumferential length of the first connecting edge 1312 is less than the circumferential length of the second connecting edge 1313. That is, the connecting plate 131 has a fan-shaped structure, and the circumferential length of the first connecting edge 1312 is less than the circumferential length of the second connecting edge 1313, meaning the arc length of the radially inner side of the connecting plate 131 is less than the arc length of the radially outer side of the connecting plate 131. This ensures that multiple connecting plates 131 can be accurately spliced ​​into a ring-shaped first sealing plate 130.

[0063] See Figure 3 and Figure 4 In one embodiment, the first connecting edge 1312, the connecting body 1311, and the second connecting edge 1313 are coplanar. That is, the connecting plate 131 is flat. In this case, the inner surface or edge of the first connecting edge 1312 is welded to the first inner cylinder 110, and the inner surface or edge of the second connecting edge 1313 is welded to the first outer cylinder 120.

[0064] In one embodiment, the connecting body 1311 is curved and / or planar. Optionally, the connecting body 1311 is planar, i.e., the connecting body 1311 is flat. Optionally, the connecting body 1311 is curved, which can avoid stress concentration. Optionally, the connecting body 1311 can also be a combination of planar and curved surfaces. Optionally, the connecting body 1311 can also be tile-shaped.

[0065] In one embodiment, the first connecting edge 1312 and / or the second connecting edge 1313 have folded edges, rounded corners, or curved surfaces. That is, at least one of the first connecting edge 1312 and the second connecting edge 1313 is bent, which facilitates the connection of the first connecting edge 1312 to the first inner cylinder 110 and the connection of the second connecting edge 1313 to the first outer cylinder 120.

[0066] In this embodiment, the first connecting edge 1312 and the second connecting edge 1313 are curved. The first connecting edge 1312 is connected to the first inner cylinder 110 through the curved surface transition, and the second connecting edge 1313 is connected to the first outer cylinder 120 through the curved surface. This avoids stress concentration and facilitates connection with the first inner cylinder 110 and the first outer cylinder 120.

[0067] Of course, in other embodiments of the present invention, the first connecting edge 1312 and the second connecting edge 1313 may have a folded edge, or they may have a rounded corner, or the first connecting edge 1312 and the second connecting edge 1313 may have different shapes, with the first connecting edge 1312 having one of a folded edge, a rounded corner, or a curved surface, and the second connecting edge 1313 having the other of a folded edge, a rounded corner, or a curved surface. Of course, the first connecting edge 1312 and the second connecting edge 1313 may also have other shapes that can reduce stress concentration and facilitate connection.

[0068] After the first sealing plate 130 is formed by connecting the connecting edge and the second connecting edge 1313 with folded edges, rounded corners or curved surfaces, it can play a role in locally or as a whole strengthening the first sealing plate 130. This can increase the strength and rigidity of the first sealing plate 130 and reduce the thickness of the first sealing plate 130.

[0069] In one embodiment, a reinforcing member is provided on at least one connecting plate 131, which can provide overall or partial reinforcement to the first sealing plate 130. This increases the strength and rigidity of the first sealing plate 130 and allows for a reduction in its thickness. Optionally, the reinforcing member is a reinforcing rib or protrusion, or other structure that provides reinforcement.

[0070] The aforementioned connecting plate 131 can be folded, stamped, etc. using simple molds or tooling, making manufacturing and processing more convenient. It eliminates the need for large and complex molds, resulting in lower costs. It is suitable for irregularly shaped sealing plates or container sealing plates with distinctive or complex shapes. Accordingly, multiple connecting plates 131 extending in the radial direction connect the first outer cylinder 120 and the first inner cylinder 110, with no interruption or thermal resistance in the radial heat transfer path between the first outer cylinder 120 and the first inner cylinder 110.

[0071] In one embodiment, two adjacent connecting plates 131 are connected by adhesive or welding. The two adjacent connecting plates 131 can be connected with glue or tape, as long as the connection between them is reliable. The two adjacent connecting plates 131 can also be connected by spot welding or other methods. Of course, in other embodiments of the present invention, the two adjacent connecting plates 131 can also be connected by other methods such as riveting. This provides a better thermal connection between the adjacent connecting plates 131.

[0072] In some embodiments, mechanical or thermal connections may be provided on the connecting plate 131 to reduce the thermal resistance in the circumferential direction and increase the strength and rigidity of the first sealing plate 130. The connection methods for adjacent connecting plates 131 are preferred, but not limited to, the aforementioned welding, riveting, pin connection, and screw connection.

[0073] See Figure 3 and Figure 5 In one embodiment, the first sealing plate 130 further includes a connecting component 132, which is disposed on the edge of the connecting plate 131. Two adjacent connecting plates 131 are spliced ​​together through the connecting component 132. The connecting component 132 is used to establish the connection between two adjacent connecting plates 131, ensuring reliable connection, improving fitting accuracy, thereby achieving a reliable connection between the first inner cylinder 110 and the first outer cylinder 120, and strengthening the circumferential heat conduction of adjacent connecting components 132.

[0074] Specifically, a portion of the connecting component 132 is disposed on one side edge of the connecting plate 131, and the other portion of the connecting component 132 is disposed on the other side edge of the connecting plate 131. When two adjacent connecting plates 131 are connected, the connecting components 132 on the edges of the two connecting plates 131 cooperate to connect the two connecting plates 131.

[0075] In one embodiment, one side edge of the connecting plate 131 has a mating portion, and the other side edge of the connecting plate 131 has a connecting portion. When two adjacent connecting plates 131 are connected, the mating portion and the connecting portion are mated and connected.

[0076] The connecting component 132 includes a connecting part and a mating part. The mating part is provided on one side edge and the connecting part is provided on the other side edge of the same connecting plate 131. When two adjacent connecting plates 131 are connected, the mating part on one connecting plate 131 is aligned with the connecting part on the other connecting plate 131, and the connection between the two adjacent connecting plates 131 is achieved by the mating connection of the connecting part and the mating part.

[0077] Optionally, each connecting plate 131 has at least one mating part and at least one connecting part, which are spaced apart in the radial direction.

[0078] In one embodiment, the mating part and the connecting part have a raised groove structure, or the mating part and the connecting part have a snap-fit ​​structure. Figure 5 As shown, the mating part and the connecting part have a raised groove structure. Of course, in other embodiments of the present invention, the mating part and the connecting part may also be a snap-fit ​​structure or other structures that can achieve mechanical connection.

[0079] For example, the connecting plate 131 is provided with staggered connecting parts 132, which are riveting joints. Adjacent connecting plates 131 can be firmly connected together by riveting. Compared with welding, riveting does not require additional heat input and will not cause deformation of the first sealing plate 130.

[0080] See Figure 3 and Figure 6Optionally, the connecting plates 131 have a uniform cross-sectional shape or size, which are uniformly distributed in the circumferential direction to form the first sealing plate 130. However, when connecting plates 131 with the same cross-sectional shape or size form the first sealing plate 130 and are used in magnetic resonance imaging equipment, the mechanical vibration of the heat shield layer 100 may induce eddy currents, resulting in artifacts in magnetic resonance imaging. To address this, at least one connecting plate 131 can be provided with a special shape, which can differ from the shape of some connecting plates 131. This can reduce local stress and change the overall mode of the first sealing plate 130 or the heat shield layer 100, thus facilitating the design and quick operation of first sealing plates 130 with at least different stiffnesses and modes.

[0081] In one embodiment, at least one of the connecting plates 131 has a recess 1314 that is recessed toward the inner side of the heat shield layer 100. That is, in this embodiment, the specific shape is the recess 1314, which is recessed toward the inner side of the heat shield layer 100 on the surface of the connecting plate 131. This reduces localized stress, thereby altering the overall mode of the first sealing plate 130 or the heat shield layer 100, allowing for convenient and quick design of first sealing plates 130 with at least different stiffnesses and modes.

[0082] Optionally, the recess 1314 can be a curved recess or a square recess, etc. Of course, in other embodiments of the present invention, the special shape can also be other shapes that can reduce stress or change vibration modes.

[0083] In one embodiment, when at least two of the connecting plates 131 have the recessed portion 1314, adjacent recessed portions 1314 are spaced apart. Of the two adjacent recessed portions 1314, one has a recessed portion 1314 and the other does not, thus changing the overall mode of the first sealing plate 130 or the heat shield layer 100, allowing for convenient and quick design of first sealing plates 130 with at least different stiffness and modes.

[0084] In one embodiment, the first sealing plate 130 has an asymmetrical structure after the recess 1314 is provided on it. That is, when the number of connecting plates 131 is odd, either an odd number or an even number of connecting plates 131 can be provided with the recess 1314. When the number of connecting plates 131 is even, either an odd number of connecting plates 131 can be provided with the recess 1314, or an even number of connecting plates 131 can be provided with the recess 1314 and the even number of connecting plates 131 with the recess 1314 is not uniformly distributed, and the odd number is preferably a prime number. This can change the overall mode of the first sealing plate 130 or the heat shield layer 100, reduce resonance during vibration, and facilitate the design and design of first sealing plates 130 with at least different stiffnesses and modes.

[0085] In one embodiment, the thermal conductivity of the material of the first outer cylinder 120 is greater than that of the materials of the first inner cylinder 110 and the first sealing plate 130. It is understood that after the first sealing plate 130 is divided into multiple connecting plates 131 in the circumferential direction, the thermal resistance of adjacent connecting plates 131 in the circumferential direction increases, affecting the heat conduction effect. Therefore, the material of the first outer cylinder 120 of the heat shield layer 100 is set to a material with good thermal conductivity, such as pure aluminum alloy. The materials of the connecting plates 131 of the first sealing plate 130 and the first inner cylinder 110 are set to materials with slightly lower thermal conductivity, such as aluminum plates with poor thermal conductivity.

[0086] This ensures that the heat flow is uniformly propagated around the circumference of the first outer cylinder 120, resulting in a small overall temperature gradient on the first outer cylinder 120. Furthermore, the use of multiple connecting plates 131 to connect the first outer cylinder 120 and the first inner cylinder 110 ensures that, although the connecting plates 131 are separated in the circumferential direction, there is no obstruction, interruption, or large thermal resistance in the radial direction connecting the first outer cylinder 120 and the first inner cylinder 110. Therefore, the heat flow can be uniformly transmitted to the first inner cylinder 110 through the connecting plates 131 without being affected by the thermal resistance of the circumferential spacing of the connecting plates 131.

[0087] Optionally, the connecting plate 131 is made of polymers or composite materials such as aluminum nitride and graphene to further reduce the eddy currents in the heat shield layer 100 and change the imaging quality.

[0088] Optionally, the first inner cylinder 110 includes a plurality of first mounting plates extending in the axial direction, and the first outer cylinder 120 includes a plurality of second mounting plates extending in the axial direction. It is worth noting that the connection method between the first mounting plates and the second mounting plates is essentially the same as the connection method of the plurality of connecting plates 131 mentioned above, and will not be described in detail here.

[0089] See Figures 1 to 3 The present invention also provides a cryogenic holder, including an inner container 300, an outer container 200, and a heat shield layer 100. The outer container 200 has a hollow magnet hole. The inner container 300 is disposed in the outer container 200 and together with the outer container 200 form an installation space. The heat shield layer 100 is disposed in the installation space. The heat shield layer 100 includes a first inner cylinder 110, a first outer cylinder 120, and two first sealing plates 130.

[0090] The first outer cylinder 120 is sleeved on the outside of the first inner cylinder 110 and is coaxially arranged with the first inner cylinder 110. Two first sealing plates 130 are arranged in a ring and are respectively disposed at both ends of the first inner cylinder 110. The first sealing plates 130 connect the ends of the first inner cylinder 110 and the ends of the first outer cylinder 120, forming a ring-shaped receiving space. The first sealing plate 130 includes multiple connecting plates 131, which extend radially and are spliced ​​together to form the ring-shaped first sealing plate 130. When the cryogenic holder of the present invention uses the heat shield layer 100 of the above embodiment, the processing difficulty is reduced, the workload is decreased, and molding is facilitated. Simultaneously, the heat shield layer 100 uses multiple radially extending connecting plates to connect the first outer cylinder 120 and the first inner cylinder 110, resulting in a low thermal resistance between the first outer cylinder 120 and the first inner cylinder 110, maintaining good thermal conductivity, thereby ensuring the overall cooling performance of the cryogenic holder.

[0091] The outer container 200 is wrapped around the outside of the heat shield layer 100. The outer container 200 includes a second inner cylinder 210, a second outer cylinder 220, and a second sealing plate 230. The second inner cylinder 210 is installed inside the second outer cylinder 220. The second sealing plate 230 connects the ends of the second outer cylinder 220 and the inner cylinder and forms a cavity. Optionally, the outer container 200 is made of metal or composite material, and more specifically, it can be made of carbon steel or stainless steel. The second inner cylinder 210 and the second outer cylinder 220 are respectively arranged radially from the center outwards, and both the second inner cylinder 210 and the second outer cylinder 220 are hollow cylindrical structures. The second sealing plate 230 is annular and connects the two ends of the second inner cylinder 210 and the second outer cylinder 220 respectively, so that the second inner cylinder 210, the second outer cylinder 220, and the second sealing plate 230 form a sealed cavity. Moreover, the second inner cylinder 210 forms an axially extending through hole.

[0092] In one embodiment, the inner container 300 is disposed within the receiving space of the shielding layer. The inner container 300 includes a third inner cylinder 310 and a third outer cylinder 330 disposed radially from the center inwards. Both the third inner cylinder 310 and the third outer cylinder 330 are hollow cylindrical structures. A third sealing plate is disposed at each end of the third inner cylinder 310. The third sealing plate has an annular structure and is connected to the third inner cylinder 310 and the third outer cylinder 330 respectively to seal them. Optionally, the inner container 300 is made of metal or composite material, and more specifically, it can be made of carbon steel or stainless steel.

[0093] The present invention also provides a magnetic resonance imaging (MRI) device, including a cryogenic holder, a superconducting magnet assembly 400, and a cryostat 500. The superconducting magnet assembly 400 is disposed in the cryogenic holder, and the cryostat 500 is disposed in the cryogenic holder for cooling the excitation coil of the superconducting magnet assembly 400. The cryostat 500 has a cold electrode 510, a primary cold head (cold electrode 510 in the figure), and a secondary cold head. The primary cold head is located outside the outer container 200, and the secondary cold head can pass through the outer container. The cryogenic holder 200 extends into the installation space; the cryogenic holder includes an inner container 300, an outer container 200, and a heat shield 100. The outer container 200 has a hollow magnet hole. The inner container 300 is disposed in the outer container 200 and together with the outer container 200 forms an installation space. The heat shield 100 is disposed in the installation space and connected to the cold electrode 510. The heat shield 100 includes a first inner cylinder 110, a first outer cylinder 120, and two first sealing plates 130.

[0094] The first outer cylinder 120 is sleeved on the outside of the first inner cylinder 110 and is coaxially arranged with the first inner cylinder 110. Two first sealing plates 130 are arranged in a ring and are respectively disposed at both ends of the first inner cylinder 110. The first sealing plates 130 connect the ends of the first inner cylinder 110 and the ends of the first outer cylinder 120 and form a ring-shaped receiving space. The first sealing plate 130 includes a plurality of connecting plates 131, which extend in the radial direction. The plurality of connecting plates 131 are spliced ​​together to form the ring-shaped first sealing plate 130.

[0095] During actual operation of the superconducting magnet assembly 400, the heat shield layer 100 acts as a primary thermal cutoff body, connected to the cold electrode 510 of the refrigerator 500. This maintains a small temperature gradient in the heat shield layer 100, thereby reducing heat conduction and radiation to the inner container 300. Figure 4 The arrows in the diagram illustrate the heat flux density distribution. By employing the cryogenic holder described in the above embodiments, the magnetic resonance imaging device of this invention can ensure that the superconducting magnet assembly 400 operates in a low-temperature environment, while also reducing production costs, simplifying the molding process, minimizing local stress, and ensuring imaging quality.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A heat shielding layer (100), characterized in that, include: First inner cylinder (110); The first outer cylinder (120) is sleeved on the outside of the first inner cylinder (110); as well as Two first sealing plates (130) are respectively disposed at both ends of the first inner cylinder (110). The first sealing plates (130) connect the end of the first inner cylinder (110) and the end of the first outer cylinder (120) and form an accommodating space. The first sealing plate (130) includes multiple connecting plates (131), which extend in the radial direction. The multiple connecting plates (131) are spliced ​​together to form the first sealing plate (130). At least one of the connecting plates (131) has a recess (1314) that is recessed into the inner side of the heat shield layer (100). When at least two of the recesses (1314) are provided, the connecting plates (131) with the recesses (1314) are spaced apart so that the first sealing plate (130) forms an asymmetrical structure, thereby changing the overall mode of the heat shield layer (100).

2. The heat shielding layer (100) according to claim 1, characterized in that, The connecting plate (131) includes a connecting body (1311), a first connecting edge (1312), and a second connecting edge (1313). The connecting body (1311) extends in the radial direction. The first connecting edge (1312) and the second connecting edge (1313) are disposed at opposite ends of the connecting body (1311). The first connecting edge (1312) is connected to the first inner cylinder (110), and the second connecting edge (1313) is connected to the first outer cylinder (120).

3. The heat shielding layer (100) according to claim 2, characterized in that, The first connecting edge (1312), the connecting body (1311), and the second connecting edge (1313) are coplanar; Alternatively, the first connecting edge (1312) and / or the second connecting edge (1313) may have a folded edge, rounded corner, or curved surface. Alternatively, the connecting body (1311) may be curved and / or planar.

4. The heat shielding layer (100) according to claim 2, characterized in that, The first sealing plate (130) also includes a connecting component (132), which is disposed on the edge of the connecting plate (131), and two adjacent connecting plates (131) are spliced ​​together through the connecting component (132).

5. The heat shielding layer (100) according to claim 4, characterized in that, One side edge of the connecting plate (131) has a mating part, and the other side edge of the connecting plate (131) has a connecting part. When two adjacent connecting plates (131) are connected, the mating part and the connecting part are mated and connected. The mating part and the connecting part are either a raised groove structure or a snap-fit ​​structure.

6. The heat shielding layer (100) according to claim 2, characterized in that, The two adjacent connecting plates (131) are connected by adhesive or welding.

7. A low-temperature holder, characterized in that, The device includes an inner container (300), an outer container (200), and a heat shield layer (100). The outer container (200) has a hollow magnetic hole. The inner container (300) is disposed within the outer container (200) and together with the outer container (200) forms an installation space. The heat shield layer (100) is disposed within the installation space. The heat shield layer (100) includes: First inner cylinder (110); The first outer cylinder (120) is sleeved on the outside of the first inner cylinder (110); and Two first sealing plates (130) are respectively disposed at both ends of the first inner cylinder (110). The first sealing plates (130) connect the end of the first inner cylinder (110) and the end of the first outer cylinder (120) and form a receiving space. At least one of the first sealing plates (130) includes a plurality of connecting plates (131), which extend in a radial direction and are spliced ​​together to form the first sealing plate (130); and at least one of the connecting plates (131) has a recess (1314) which is recessed into the inner side of the heat shield layer (100). When at least two recesses (1314) are provided, the connecting plates (131) with the recesses (1314) are spaced apart so that the first sealing plate (130) forms an asymmetrical structure, thereby changing the overall mode of the heat shield layer (100).

8. A magnetic resonance imaging device, characterized in that, The system includes a cryogenic holder and a superconducting magnet assembly (400), the superconducting magnet assembly (400) being disposed within the cryogenic holder; the cryogenic holder includes an inner container (300), an outer container (200), and a heat shield layer (100), the outer container (200) having a hollow magnet hole, the inner container (300) being disposed within the outer container (200), and together with the outer container (200) forming an installation space; the heat shield layer (100) is disposed within the installation space; wherein, the heat shield layer (100) includes: First inner cylinder (110); The first outer cylinder (120) is sleeved on the outside of the first inner cylinder (110); and Two first sealing plates (130) are respectively disposed at both ends of the first inner cylinder (110). The first sealing plates (130) connect the end of the first inner cylinder (110) and the end of the first outer cylinder (120) and enclose a receiving space. At least one of the first sealing plates (130) includes multiple connecting plates (131). The connecting plates (131) extend in the radial direction and the multiple connecting plates (131) are spliced ​​together to form the first sealing plate (130). At least one of the connecting plates (131) has a recess (1314). The recess (1314) is recessed into the inner side of the heat shield layer (100). When at least two recesses (1314) are provided, the connecting plates (131) with the recesses (1314) are spaced apart so that the first sealing plate (130) forms an asymmetrical structure, thereby changing the overall mode of the heat shield layer (100).

9. The magnetic resonance apparatus according to claim 8, characterized in that, Also includes: A refrigerator (500) is disposed in the cryogenic holder, and at least a portion of the cold electrode of the refrigerator (500) is thermally coupled to the thermal shielding layer (100).

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