Superconducting magnet and magnetic resonance imaging apparatus

Abstract

The utility model discloses a superconducting magnet and magnetic resonance imaging equipment, superconducting magnet includes coil skeleton, superconducting coil and guide cold device, and the coil skeleton is circular ring, and the wire slot is formed on the coil skeleton, and the wire slot constructs as the circular ring wire slot that recesses from the outer peripheral surface of coil skeleton to the inner peripheral surface direction of coil skeleton, and superconducting coil includes the multilayer superconducting wire that is around the wire slot, and guide cold device sets up in the layer of superconducting coil, and with superconducting coil heat exchange cooperation. According to the superconducting magnet of the utility model, through setting up guide cold device in the layer of superconducting coil, guide cold device can with internal superconducting coil heat exchange, reduced the temperature of internal superconducting coil, improved the uniformity of temperature distribution of superconducting magnet, reduced the possibility that internal superconducting coil temperature is too high and leads to superconducting coil quench, strengthened the performance stability of superconducting magnet.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment, and in particular to a superconducting magnet and a magnetic resonance imaging device. Background Technology

[0002] In related technologies, superconducting magnets are key components in magnetic resonance imaging (MRI) equipment. The superconducting coils in a superconducting magnet need to be in a superconducting state at operating temperatures (below 4.2K) to provide a high-strength magnetic field for MRI equipment. However, in the absence of liquid helium or with a small amount of liquid helium in the magnet, the cooling capacity is difficult to conduct to the inside of the superconducting coil, which leads to the risk of the superconducting magnet losing its superconductivity. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a superconducting magnet that can reduce the risk of quench failure.

[0004] This invention also proposes a magnetic resonance imaging device having the aforementioned superconducting magnet.

[0005] According to a first aspect of the present invention, a superconducting magnet includes a coil frame, a superconducting coil, and a cooling device. The coil frame is annular, and a groove is formed on the coil frame. The groove is constructed to be an annular groove that surrounds the entire circumference of the coil frame and is recessed from the outer circumference of the coil frame towards the inner circumference of the coil frame. The superconducting coil includes multiple layers of superconducting wire wound on the groove. The cooling device is disposed between the layers of the superconducting coil and cooperates with the superconducting coil for heat exchange.

[0006] According to the embodiments of the present invention, the superconducting magnet, by placing a cooling device between the layers of the superconducting coil, can exchange heat with the internal superconducting coil, thereby reducing the temperature of the internal superconducting coil, improving the uniformity of the temperature distribution of the superconducting magnet, reducing the possibility of the superconducting coil losing its quench due to excessively high internal superconducting coil temperature, and enhancing the performance stability of the superconducting magnet.

[0007] In some embodiments, the cooling device surrounds the cable tray.

[0008] In some embodiments, the cooling device includes a plurality of arc-shaped plates spliced ​​circumferentially along the groove, each arc-shaped plate having a central angle less than or equal to 180°, wherein the arc-shaped plate is a solid cold plate and is heat exchanged with the coil frame; or, the arc-shaped plate is a hollow cold plate with a cooling medium accommodating cavity inside.

[0009] In some embodiments, the cooling device includes a cooling pipe wound along a spiral around the groove; or, the cooling pipe includes a plurality of sub-pipes extending circumferentially along the groove and arranged side by side along the axial direction of the groove, the plurality of sub-pipes being connected in series and / or in parallel.

[0010] In some embodiments, the cooling device is heat exchanged with the coil frame, and / or the cooling device has a cooling medium receiving cavity, and the cooling device has an inlet and an outlet that communicate with the cooling medium receiving cavity.

[0011] In some embodiments, the cooling device divides the superconducting coil into multiple layers spaced radially along the slot, each layer comprising at least two layers of the superconducting wire, wherein the thickness of the cooling device in the radial direction of the slot of the coil frame is greater than the thickness of a single layer of the superconducting wire and less than the thickness of a single layer.

[0012] In some embodiments, the groove is one or a plurality of grooves spaced apart along the axial direction, and the cooling device corresponding to each groove is a plurality of grooves spaced apart radially along the groove.

[0013] In some embodiments, the cooling device is fixedly installed on both sides of the wire groove in the axial direction to the coil frame, and engages with the coil frame in heat exchange on both sides of the wire groove in the axial direction.

[0014] In some embodiments, the coil frame is provided with a plurality of connecting grooves on each side of the wire groove along the axial direction, and the cooling device includes a connecting portion embedded in the connecting groove, and the cooling device is fixedly installed to the coil frame through the connecting portion.

[0015] According to a second aspect of the present invention, the magnetic resonance imaging device includes a superconducting magnet according to any embodiment of the first aspect of the present invention.

[0016] The magnetic resonance imaging device according to the present invention improves the reliability and stability of the operation of the magnetic resonance imaging device by setting the superconducting magnet of the first aspect described above.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a superconducting magnet according to an embodiment of the present invention; Figure 2 yes Figure 1 The cross-sectional view of the superconducting magnet shown in the figure; Figure 3 This is a cross-sectional view of a superconducting magnet with a solid cold plate as the cooling device according to an embodiment of the present invention; Figure 4 yes Figure 3 A schematic diagram of the superconducting magnet shown; Figure 5 yes Figure 4 A schematic diagram of the curved plate shown; Figure 6 This is a cross-sectional view of a superconducting magnet with a hollow cold plate as the cooling device according to an embodiment of the present invention; Figure 7 This is a cross-sectional view of a superconducting magnet with a cold pipe as the cooling device according to an embodiment of the present invention; Figure 8 This is a cross-sectional view of a superconducting magnet with two grooves according to an embodiment of the present invention; Figure 9 yes Figure 4 A schematic diagram of another embodiment of the curved plate shown; Figure 10 yes Figure 4 A schematic diagram of yet another embodiment of the curved plate shown; Figure 11 This is a schematic diagram of a magnetic resonance imaging device according to an embodiment of the present invention.

[0020] Figure label: Magnetic resonance imaging equipment 1000; axial direction X of the wire groove; radial direction Y of the wire groove; Superconducting magnet 100; 1. Coil frame; 11. Wire groove; 12. Connecting groove; 13. Fixing part; Superconducting coil 2; Layer group 21; First layer group 211; Second layer group 212; Third layer group 213; Superconductor 22; Cooling device 3; receiving cavity 31; inlet 32; outlet 33; Connecting part 34; connecting plate 34a; first connecting plate 34a1; second connecting plate 34a2; Curved plate 3a; solid cold-rolled plate 3a1; first solid cold-rolled plate 3a11; second solid cold-rolled plate 3a12; Hollow cold plate 3a2; Cold pipe 3b; First cold pipe 3b1; Second cold pipe 3b2. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0022] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0023] Hereinafter, with reference to the accompanying drawings, a superconducting magnet 100 according to a first aspect embodiment of the present invention will be described.

[0024] Reference Figure 1 , Figure 2 and Figure 3 The superconducting magnet 100 includes a coil frame 1 and a superconducting coil 2. The coil frame 1 is annular and has a groove 11 formed on it. The groove 11 is annular groove that surrounds the entire circumference of the coil frame 1 and is recessed from the outer circumference of the coil frame 1 towards the inner circumference of the coil frame 1. The superconducting coil 2 includes a multilayer superconducting wire 22 wound on the groove 11.

[0025] The coil frame 1 serves as a support for the superconducting coil 2, and it can also contact the cold head of the cryostat, thereby transferring cooling energy to the superconducting coil 2. This facilitates the superconducting coil 2 reaching or maintaining its operating temperature, enabling it to exhibit a superconducting state. A circular groove 11 is formed on the coil frame 1, encircling the entire circumference and concave from the outer to the inner circumference, creating a continuous winding space. This allows the superconducting wire 22 to be tightly and uniformly wound within the groove 11, reducing interlayer gaps and thermal resistance, thus facilitating the transfer of cooling energy from the coil frame 1 to the superconducting coil 2. The superconducting magnet 100 also includes a cryostat, a vacuum system, and a power supply system, which are known to those skilled in the art and will not be described further here.

[0026] The material of the coil frame 1 is not limited. For example, the material of the coil frame 1 can be a metal or fiberglass with good thermal conductivity, such as stainless steel, aluminum alloy, or fiberglass (GRP). The shape of the cross-section of the wire groove 11 is not limited. For example, the cross-section of the wire groove 11 can be rectangular, trapezoidal, or semi-circular, etc.

[0027] Reference Figure 1 , Figure 2 and Figure 3 The superconducting magnet 100 also includes a cooling device 3, which is disposed between the layers of the superconducting coil 2 and is heat exchanged with the superconducting coil 2 (i.e., it can transfer heat).

[0028] The cooling device 3 is disposed between the layers of the superconducting coil 2 (i.e., between layers, or between two adjacent superconducting wires 22). Thus, the cooling device 3 can conduct cold energy to the inner superconducting coil 2 (wherein the inner superconducting coil 2 is the superconducting wire 22 located between the outermost and innermost superconducting wires 22), resulting in a more uniform temperature distribution in the superconducting magnet 100. This reduces the possibility of the superconducting coil 2 losing its superconductivity due to excessively high temperature, and enhances the performance stability of the superconducting magnet 100.

[0029] The heat exchange between the cooling device 3 and the superconducting coil 2 refers to the exchange of heat between the cooling device 3 and the superconducting coil 2 through direct contact or indirect heat conduction, heat convection, heat radiation, etc. For example, the cooling device 3 can conduct heat to the internal superconducting coil 2 by contacting the coil frame 1, which in turn contacts the cold head of the refrigerator; alternatively, the cooling device 3 can directly contact the cold head of the refrigerator to conduct heat to the internal superconducting coil 2; or the cooling device 3 can be filled with a cooling medium (such as liquid helium, added during production to cool the superconducting coil 2, discharged after reaching the operating temperature, and ultimately not retained in the superconducting magnet 100) to conduct heat to the internal superconducting coil 2.

[0030] The form of the cooling device 3 is not limited. For example, the cooling device 3 can be a cooling plate, a cooling pipe 3b, a cooling frame (e.g., a honeycomb frame, into which a cooling medium can be added), etc. It is worth noting that the cooling device 3 can also be arranged on the outer side of the superconducting coil 2 in the radial direction, thereby making it easier for the superconducting coil 2 to reach the operating temperature.

[0031] In related technologies, superconducting magnets are key components in magnetic resonance imaging (MRI) equipment. The superconducting coils in the superconducting magnet need to be in a superconducting state at the operating temperature (below 4.2K) to provide a high magnetic field for the MRI equipment. However, the cooling capacity is difficult to conduct to the inside of the superconducting coils, which leads to the risk of the superconducting magnet losing its superconductivity.

[0032] For example, superconducting magnets are used in magnetic resonance imaging (MRI) equipment. They utilize the signals generated by hydrogen protons in the human body under the combined action of an external magnetic field and radio frequency pulses, which are then reconstructed to form an image. The superconducting magnet, as a core component of MRI, provides a high-strength magnetic field. Conventional superconducting magnets immerse the superconducting wire in liquid helium to maintain its operating temperature. However, liquid helium is expensive and limited in resources. The higher the magnetic field strength of the superconducting magnet, the more liquid helium it requires throughout its entire lifespan, thus significantly increasing production costs and future uncertainties. Therefore, liquid helium-free or low-liquid-helium superconducting magnets have become an important research direction. However, in the case of liquid helium-free or low-liquid-helium magnets, the cooling capacity is difficult to conduct to the internal superconducting coils. Whether during the excitation process or during the operation of the MRI equipment, if any part of the superconducting wire exceeds its operating temperature, the superconducting magnet will lose its superconductivity.

[0033] In the technical solution of this application, the coil frame 1 can serve as the winding frame for the superconducting coil 2 to support it. Simultaneously, the coil frame 1 can also contact the cold head of the refrigerator, thereby transferring cooling energy from the superconducting coil 2 directly in contact with the coil frame 1 to the internal superconducting coil 2, which is not in direct contact with the coil frame 1, thus reducing the temperature of the internal superconducting coil 2. The annular groove 11 allows the superconducting wire 22 to be tightly and uniformly wound within the groove 11, reducing interlayer gaps and thus decreasing thermal resistance. This facilitates the transfer of cooling energy from the coil frame 1 to the internal superconducting coil 2, thereby reducing its temperature. The cooling device 3 is disposed between the layers of the superconducting coil 2. The cooling device 3 can exchange heat with the internal superconducting coil 2, further reducing its temperature, improving the uniformity of the temperature distribution of the superconducting magnet 100, reducing the possibility of the superconducting coil 2 losing its quench due to excessively high temperature, and enhancing the performance stability of the superconducting magnet 100.

[0034] Reference Figure 4In some embodiments, the cooling device 3 surrounds the groove 11. Here, "surrounds" means that the cooling device 3 extends continuously around the groove 11 for a full circumference. Of course, the cooling device 3 can be a single unit that surrounds the entire circumference, or multiple cooling devices 3 can be joined together to surround the entire circumference.

[0035] In the above technical solution, the cooling device 3 surrounds the groove 11, so that the cooling energy can be uniformly conducted to the internal superconducting coil 2. Compared with the spaced arrangement of the cooling device 3, it can improve the uniformity of the temperature distribution of the superconducting magnet 100, reduce the risk of the superconducting coil 2 losing superheat due to local overheating, and improve the stability and reliability of the superconducting magnet 100.

[0036] Reference Figure 4 , Figure 5 and Figure 6 In some embodiments, the cooling device 3 includes a plurality of arc-shaped plates 3a spliced ​​circumferentially along the groove 11, wherein the central angle of each arc-shaped plate 3a is less than or equal to 180°, wherein the arc-shaped plate 3a is a solid cold plate 3a1 and is heat exchanged with the coil frame 1; or, the arc-shaped plate 3a is a hollow cold plate 3a2 with a cooling medium receiving cavity 31 inside.

[0037] In the above technical solution, the cooling device 3 includes multiple arc-shaped plates 3a spliced ​​circumferentially along the groove 11. This allows for convenient adjustment of the number and splicing method of the arc-shaped plates 3a according to the actual size and shape of the coil frame 1, adapting to coil frames 1 of different specifications and improving the versatility and adaptability of the cooling device 3. For example, the cooling device 3 includes two arc-shaped plates 3a spliced ​​circumferentially along the groove 11, each arc-shaped plate 3a having a central angle of 180°. The two arc-shaped plates 3a are spliced ​​circumferentially around the groove 11. Of course, the cooling device 3 can also include three, four, five, or more arc-shaped plates 3a, with multiple arc-shaped plates 3a spliced ​​circumferentially around the groove 11. When the cooling device 3 includes multiple arc-shaped plates 3a, the central angle of each arc-shaped plate 3a can be equal or unequal.

[0038] In the above technical solution, the arc plate 3a can be a solid cold plate 3a1, and the solid cold plate 3a1 is heat exchanged with the coil frame 1. Thus, after the coil frame 1 absorbs the cold energy from the cold head of the refrigerator, it can transfer the cold energy to the solid cold plate 3a1 through direct contact with it. The solid cold plate 3a1 then transfers its cold energy to the internal superconducting coil 2 in contact with it, thereby achieving the cooling of the internal superconducting coil 2. The solid cold plate 3a1 has a simple structure, is easy to process and manufacture, and has good thermal conductivity, which helps the internal superconducting coil 2 to reach and maintain the working temperature more quickly.

[0039] In the above technical solution, the arc-shaped plate 3a can be a hollow cold plate 3a2 with an internal cooling medium receiving cavity 31. Thus, the cooling medium can transfer cooling energy to the inner wall of the hollow cold plate 3a2, and then transfer the cooling energy to the superconducting coil 2 in contact with the wall of the hollow cold plate 3a2 through thermal conductivity, thereby achieving cooling of the internal superconducting coil 2. The cooling medium in the receiving cavity 31 can flow within the hollow cold plate 3a2, thereby forming a more uniform temperature field, reducing local heat accumulation, and making the temperature distribution of the internal superconducting coil 2 more uniform, further reducing the risk of quenching. It is worth noting that the cooling medium (e.g., liquid helium) does not ultimately remain in the receiving cavity 31 and can be recycled.

[0040] Reference Figure 7 In some embodiments, the cooling device 3 includes a cold pipe 3b, which is wound along a spiral line surrounding the groove 11; or, the cold pipe 3b includes multiple sub-pipes extending circumferentially along the groove 11 and arranged side by side along the axial direction X of the groove 11, with the multiple sub-pipes connected in series and / or in parallel. A cooling medium can circulate inside the cold pipe 3b, transferring cooling energy to the internal superconducting coil 2 through heat conduction and convection. The multiple sub-pipes being connected in series and / or in parallel means that the multiple sub-pipes can be connected in series sequentially or simultaneously in parallel, or multiple sub-pipes can be connected in both series and parallel configurations.

[0041] In the above technical solution, the cold tube 3b is wound along the spiral line of the surrounding groove 11, which can increase the contact area between the cold tube 3b and the internal superconducting coil 2, thereby transferring more cooling energy to the internal superconducting coil 2, reducing the situation of local cooling energy concentration or insufficient cooling energy, effectively reducing the risk of the superconducting coil 2 losing its superheat due to uneven temperature, and improving the stability and reliability of the superconducting magnet 100 operation.

[0042] In the above technical solution, the cold pipe 3b includes multiple sub-pipes that extend circumferentially along the groove 11 and are arranged side by side along the axial direction X of the groove 11. When connected in series, the cooling medium flows through each sub-pipe in sequence, which can increase the flow rate and residence time of the cooling medium in the cooling device 3 and improve the cooling effect. When connected in parallel, the parallel connection of multiple sub-pipes can increase the channel and area for cold transfer, accelerate the cooling speed, and thus achieve the cooling of the internal superconducting coil 2 more quickly.

[0043] Reference Figure 8 In some embodiments, the cooling device 3 and the coil frame 1 are in heat exchange cooperation. This heat exchange cooperation means that the cooling device 3 and the coil frame 1 exchange heat through direct contact or indirect heat conduction, convection, radiation, etc. For example, referring to… Figure 8The cooling device 3 can conduct cold energy through the contact portion with the coil frame 1 (e.g., the side wall of the arc plate 3a and the connecting portion 34 described below) to reduce the temperature of the internal superconducting coil 2. Thus, the cooling device 3 can transfer the cold energy of the coil frame 1 to the internal superconducting coil 2 in contact with it, thereby cooling the internal superconducting coil 2.

[0044] Reference Figure 6 In some embodiments, the cooling device 3 has a cooling medium receiving cavity 31, and the cooling device 3 has an inlet 32 ​​and an outlet 33 communicating with the cooling medium receiving cavity 31. For example, as shown... Figure 6 As shown, the cooling device 3 is a hollow cold plate 3a2, which has a cooling medium receiving cavity 31. The side wall of the hollow cold plate 3a2 has an inlet 32 ​​and an outlet 33. The inlet 32 ​​and outlet 33 can be connected to a refrigeration device, thereby enhancing the cooling capacity of the cooling medium. When the internal superconducting coil 2 reaches its operating temperature, the cooling medium (e.g., liquid helium) can be discharged through the outlet 33. The cooling medium ultimately does not remain in the receiving cavity 31 and can be recycled.

[0045] Reference Figure 6 In some embodiments, the cooling device 3 is heat-exchange coupled with the coil frame 1. The cooling device 3 has a cooling medium receiving cavity 31, and has an inlet 32 ​​and an outlet 33 communicating with the cooling medium receiving cavity 31. Thus, the cooling device 3 can reduce the temperature of the internal superconducting coil 2 by conducting cold energy through its contact with the coil frame 1, or by conducting cold energy through the cooling medium in the receiving cavity 31, thereby allowing the internal superconducting coil 2 to reach or maintain its operating temperature more quickly. In this case, the cooling device 3 can be a discontinuous surrounding groove 11, that is, the cooling device 3 can be spaced circumferentially around the groove 11.

[0046] Reference Figure 3 In some embodiments, the cooling device 3 divides the superconducting coil 2 into multiple layers 21 spaced radially Y along the groove 11. Each layer 21 includes at least two layers of superconducting wire 22. The thickness L1 of the cooling device 3 in the radial Y of the groove 11 is greater than the thickness L2 of a single layer of superconducting wire 22 and less than the thickness L3 of a single layer 21.

[0047] For example, such as Figure 3As shown, the cooling device 3 consists of a first solid cold plate 3a11 and a second solid cold plate 3a12 spaced sequentially along the radial Y direction of the slot 11. The solid cold plate 3a1 divides the superconducting coil 2 into a first layer group 211, a second layer group 212, and a third layer group 213 spaced sequentially along the radial Y direction of the slot 11. It is worth noting that the number of cooling devices 3 and the number of layer groups 21 separated by the cooling devices 3 are not limited. For example, there can be 1, 2, 3, 4, and 5 cooling devices 3, etc., and there can be 2, 3, 4, 5, and 6 layer groups, etc. If the total number of layers of the wound superconducting wire 22 is large, the number of cooling devices 3 can be increased to separate more layer groups 21, so as to better conduct the cooling energy to the internal superconducting coil 2.

[0048] In the above technical solution, the cooling device 3 divides the superconducting coil 2 into multiple layers 21 with radial Y-spaced along the slot 11, thereby better cooling the internal superconducting coil 2, improving the temperature uniformity of the internal superconducting coil 2, reducing the loss of superconductivity of the superconducting wire 22 due to excessive local temperature, and thus improving the reliability and service life of the superconducting magnet 100.

[0049] In the above technical solution, the thickness of the cooling device 3 in the radial Y direction of the groove 11 of the coil frame 1 is greater than the thickness of the single-layer superconducting wire 22, but less than the thickness of a single layer group 21, making the thickness setting of the cooling device 3 more reasonable. Specifically, being greater than the thickness of the single-layer superconducting wire 22 allows the cooling device 3 to have sufficient structural strength and cooling capacity, effectively separating the layer group 21 and providing support; being less than the thickness of a single layer group 21 reduces the space occupied by the cooling device 3, ensuring that there is enough space within the layer group 21 to accommodate the superconducting wire 22, which is beneficial to increasing the number of turns of the superconducting wire 22, thereby improving the magnetic field strength of the superconducting magnet 100.

[0050] Reference Figure 8 In some embodiments, the groove 11 is one or multiple grooves spaced apart along the axial direction X of the groove 11, and the cooling device 3 corresponding to each groove 11 is multiple and spaced apart along the radial direction Y of the groove 11.

[0051] In the above technical solution, there is one slot 11 or multiple slots spaced at intervals along the axial direction X of the slot 11. For large superconducting magnets 100, multiple slots 11 can be spaced at intervals along the axial direction X of the slot 11, thereby improving the structural strength of the coil frame 1, facilitating the fixation of the cooling device 3, and enabling the coil frame 1 to wind more superconducting coils 2, thereby increasing the magnetic field strength. For small superconducting devices, only one slot 11 can be set, reducing cost and complexity. There are multiple cooling devices 3 corresponding to each slot 11, which are spaced at intervals along the radial direction Y of the slot 11, so that the internal superconducting coils 2 at different radial positions can be cooled, making the temperature of the internal superconducting coils 2 more uniform in the radial direction Y of the entire slot 11, reducing the quenching phenomenon caused by local overheating, and improving the stability and reliability of the superconducting magnet 100 operation.

[0052] Reference Figure 8 In some embodiments, the cooling device 3 is fixedly mounted on both sides of the wire groove 11 along the axial direction X to the coil frame 1, and the cooling device 3 is in heat exchange cooperation with the coil frame 1 on both sides of the wire groove 11 along the axial direction X. Exemplarily, the coil frame 1 includes a fixing part 13, which is disposed on both sides of the wire groove 11 along the axial direction X, and the cooling device 3 is connected to the fixing part 13.

[0053] In the above technical solution, the cooling device 3 can be fixedly installed on the coil frame 1, which facilitates the fixation of the cooling device 3 and reduces the possibility of the cooling device 3 shaking during operation. At the same time, the cooling device 3 can cooperate with the coil frame 1 through the contact part (e.g., the connecting part 34) to exchange heat. Thus, the cooling device 3 can transfer the cold energy of the coil frame 1 to the internal superconducting coil 2 that is in contact with the cooling device 3, thereby achieving the cooling of the internal superconducting coil 2.

[0054] Reference Figure 4 , Figure 5 and Figure 8 In some embodiments, the coil frame 1 is provided with a plurality of connecting grooves 12 on each side of the axial X of the wire groove 11, which are spaced apart circumferentially along the wire groove 11. The cooling device 3 includes a connecting part 34 embedded in the connecting groove 12, and the cooling device 3 is fixedly installed with the coil frame 1 through the connecting part 34.

[0055] For example, the cooling device 3 is an arc-shaped plate 3a, the coil frame 1 includes a fixing part 13, the fixing part 13 is provided with a connecting groove 12 communicating with the wire groove 11, and the connecting part 34 is a connecting plate 34a, the connecting plate 34a and the connecting groove 12 are positioned and engaged. For example, Figure 9 As shown, the connecting plate 34a may include a first connecting plate 34a1 and a second connecting plate 34a2. The first connecting plate 34a1 is disposed on the two side walls at both ends of the arc-shaped plate 3a, and the second connecting plate 34a2 is disposed on the two side walls in the middle of the arc-shaped plate 3a; Figure 4As shown, a connecting groove 12 is formed on the fixing part 13 to mate with the connecting plate 34a, and the connecting plate 34a is connected to the connecting groove 12. The lengths of the first connecting plate 34a1 and the second connecting plate 34a2 are not limited; they can be either shorter or longer connecting plates 34a. Of course, as... Figure 10 As shown, the first connecting plate 34a1 and the second connecting plate 34a2 can also be connected together to form a whole connecting plate 34a, which makes the fixation more secure and increases the contact area between the cooling device 3 and the coil frame 1. This facilitates the conduction of the cold energy of the coil frame 1 to the internal superconducting coil 2 through the connecting plate 34a and the connecting groove 12 to reduce the temperature of the internal superconducting coil 2, improves the uniformity of the temperature distribution of the superconducting magnet 100, reduces the possibility of the superconducting coil 2 losing its quench due to excessive temperature, and enhances the performance stability of the superconducting magnet 100.

[0056] Reference Figure 11 According to the second aspect of the present invention, the magnetic resonance imaging device 1000 includes a superconducting magnet 100 according to any embodiment of the first aspect of the present invention.

[0057] The magnetic resonance imaging device 1000 according to the present invention improves the reliability and stability of operation by setting the superconducting magnet 100 of the first aspect.

[0058] The following describes a specific embodiment of a superconducting magnet 100.

[0059] Reference Figure 1 and Figure 2 The superconducting magnet 100 includes an annular coil frame 1, a superconducting coil 2, and a cooling device 3. A groove 11 is formed on the coil frame 1. The groove 11 is an annular groove that surrounds the entire circumference of the coil frame 1 and is recessed from the outer circumference of the coil frame 1 to the inner circumference of the coil frame 1. The superconducting coil 2 includes a multilayer superconducting wire 22 wound on the groove 11. The arc plate 3a is a solid cold plate 3a1 and is heat exchanged with the coil frame 1.

[0060] Reference Figure 3 The cooling device 3 consists of a first solid cold plate 3a11 and a second solid cold plate 3a12 spaced sequentially along the radial Y direction of the slot 11, dividing the superconducting coil 2 into a first layer group 211, a second layer group 212, and a third layer group 213 spaced sequentially along the radial Y direction of the slot 11, as shown in the reference. Figure 4The first solid cold plate 3a11 and the second solid cold plate 3a12 each include two arc-shaped solid cold plates 3a1 spliced ​​circumferentially along the groove 11. The central angle of each arc-shaped solid cold plate 3a1 is equal to 180°. The thickness L1 of the solid cold plate 3a1 in the radial Y direction of the groove 11 is greater than the thickness L2 of the single layer superconducting wire 22 and less than the thickness L3 of the single layer group 21.

[0061] Reference Figure 4 and Figure 5 The coil frame 1 includes a fixing part 13, on which a connecting groove 12 communicating with the wire groove 11 is provided. The solid cold plate 3a1 includes a connecting plate 34a embedded in the connecting groove 12, and the connecting plate 34a is fixedly installed with the connecting groove 12. The connecting plate 34a includes a first connecting plate 34a1 and a second connecting plate 34a2. The first connecting plate 34a1 is provided on the two side walls at both ends of the solid cold plate 3a1, and the second connecting plate 34a2 is provided on the two side walls in the middle of the arc plate 3a. The fixing part 13 has a connecting groove 12 that matches the connecting plate 34a, and the connecting plate 34a and the connecting groove 12 are connected by screws.

[0062] Therefore, after the coil frame 1 absorbs the cold energy from the cold head of the refrigerator, it can conduct the cold energy to the solid cold plate 3a1 through the cold bridge formed by the connecting plate 34a and the connecting groove 12. The solid cold plate 3a1 then transfers the cold energy to the internal superconducting coil 2 in contact with it, thereby cooling the internal superconducting coil 2, reducing the temperature of the internal superconducting coil 2, improving the uniformity of the temperature distribution of the superconducting magnet 100, reducing the possibility of the superconducting coil 2 losing its quench due to excessive temperature, and enhancing the performance stability of the superconducting magnet 100.

[0063] The installation method of the superconducting magnet 100 is as follows: several layers of superconducting wire 22 are first wound in the groove 11 of the coil frame 1 to form a first layer group 211. The superconducting wire 22 of the first layer group 211, which is in close contact with the groove 11, can directly transfer the cooling energy to the external superconducting wire 22 in contact with it through the metal or fiberglass coil frame 1. Then, a first solid cold plate 3a11 is installed on the radially outer side of the first layer group 211. The first solid cold plate 3a11 is two semi-circular arcs spliced ​​along the circumference of the groove 11. A solid cold plate 3a1 is formed, and the first solid cold plate 3a11 is closely attached to the superconducting wire 22 on the radial outer side of the first layer group 211. The first solid cold plate 3a11 has a first connecting plate 34a1 and a second connecting plate 34a2. The first connecting plate 34a1 has one through hole, and the second connecting plate 34a2 has two through holes. The number and position of the connecting plates 34a correspond to the connecting groove 12, so that the first solid cold plate 3a11 can be fixed to the coil frame 1 by passing a fixing screw through the through hole.

[0064] Then, a superconducting wire 22 is wound around the first solid cold plate 3a11 to form a second layer group 212. After the second layer group 212 is formed, the fixing screws are removed, and the second solid cold plate 3a12 is installed on the superconducting wire 22 closely attached to the radial outer side of the second layer group 212, so that the second layer group 212 is sandwiched between the first solid cold plate 3a11 and the second solid cold plate 3a12. The second solid cold plate 3a12 has a first connecting plate 34a1 and a second connecting plate 34a2 and is connected to the first solid cold plate. The number and position of the connecting plates 34a of 3a11 are the same; the connecting plates 34a of the second solid cold plate 3a12 are placed in the connecting groove 12 of the coil frame 1, and the second solid cold plate 3a12 and the first solid cold plate 3a11 are fixed together on the fixing part 13 of the coil frame 1 by means of fixing screws passing through the through holes on the connecting plates 34a. The superconducting wire 22 is then wound around the outside of the second solid cold plate 3a12 to form the third layer group 213, thereby completing the installation of the superconducting magnet 100.

[0065] The following describes a specific embodiment of a superconducting magnet 100, which is shown in the second embodiment.

[0066] Reference Figure 1 , Figure 2 and Figure 7 The superconducting magnet 100 includes an annular coil frame 1, a superconducting coil 2, and a cooling device 3. A groove 11 is formed on the coil frame 1. The groove 11 is an annular groove that surrounds the entire circumference of the coil frame 1 and is recessed from the outer circumference of the coil frame 1 to the inner circumference of the coil frame 1. The superconducting coil 2 includes a multilayer superconducting wire 22 wound on the groove 11. The cooling device 3 is a cold pipe 3b and is heat exchanged with the coil frame 1.

[0067] The cold tube 3b is wound along a spiral line around the groove 11. A cooling medium receiving cavity 31 is formed inside the cold tube 3b. An inlet 32 ​​and an outlet 33 communicating with the receiving cavity 31 are formed at both ends of the cold tube 3b. The cold tube 3b includes a first cold tube 3b1 and a second cold tube 3b2 that are spaced apart in the radial direction Y along the groove 11, which divides the superconducting coil 2 into a first layer group 211, a second layer group 212 and a third layer group 213 that are spaced apart in the radial direction Y along the groove 11.

[0068] The cooling tube 3b injects cooling medium (liquid helium) from the inlet 32 ​​through the inlet tube to cool the superconducting coil 2. After the temperature of the superconducting wire 22 reaches the working temperature, the cooling medium (liquid helium) is discharged through the outlet 33 of the cooling tube 3b, so that the cooling medium (liquid helium) does not remain inside the superconducting magnet 100 and can be recycled.

[0069] Therefore, the cooling medium (liquid helium) in the cavity 31 can conduct cold energy to the wall of the cold tube, and the wall of the cold tube can then transfer the cold energy to the internal superconducting coil 2 in contact with it, thereby cooling the internal superconducting coil 2, reducing the temperature of the internal superconducting coil 2, improving the uniformity of the temperature distribution of the superconducting magnet 100, reducing the possibility of the superconducting coil 2 losing its quench due to excessive temperature, and enhancing the performance stability of the superconducting magnet 100.

[0070] Other components of the superconducting magnet according to the embodiments of the present invention, such as the cold head of the refrigerator, and its operation are known to those skilled in the art and will not be described in detail here.

[0071] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0072] 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 one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0073] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 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. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0074] In this utility model, 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," "on top of," and "over" 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.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A superconducting magnet, characterized in that, include: A coil frame, wherein the coil frame is circular and a groove is formed on the coil frame. The groove is constructed to be a circular groove that surrounds the entire circumference of the coil frame and is recessed from the outer circumference of the coil frame toward the inner circumference of the coil frame. A superconducting coil, the superconducting coil comprising multiple layers of superconducting wire wound on the slot; A cooling device is disposed between the layers of the superconducting coil and is in heat exchange cooperation with the superconducting coil.

2. The superconducting magnet according to claim 1, characterized in that, The cooling device surrounds the cable groove.

3. The superconducting magnet according to claim 2, characterized in that, The cooling device includes multiple arc-shaped plates spliced ​​circumferentially along the groove, each arc-shaped plate having a central angle less than or equal to 180°. The arc-shaped plates are solid cold plates that are heat exchanged with the coil frame; or, the arc-shaped plates are hollow cold plates with a cooling medium cavity inside.

4. The superconducting magnet according to claim 2, characterized in that, The cooling device includes a cooling pipe wound along a spiral line surrounding the groove; or, the cooling pipe includes a plurality of sub-pipes extending circumferentially along the groove and arranged side by side along the axial direction of the groove, the plurality of sub-pipes being connected in series and / or in parallel.

5. The superconducting magnet according to claim 1, characterized in that, The cooling device is heat exchanged with the coil frame, and / or the cooling device has a cooling medium receiving cavity, and the cooling device has an inlet and an outlet that communicate with the cooling medium receiving cavity.

6. The superconducting magnet according to claim 1, characterized in that, The cooling device divides the superconducting coil into multiple layers spaced radially along the slot, each layer comprising at least two layers of the superconducting wire. The thickness of the cooling device in the radial direction of the slot is greater than the thickness of a single layer of the superconducting wire but less than the thickness of a single layer.

7. The superconducting magnet according to claim 1, characterized in that, The groove is one or multiple grooves spaced apart along the axial direction of the groove, and the cooling device corresponding to each groove is multiple and spaced apart along the radial direction of the groove.

8. The superconducting magnet according to claim 1, characterized in that, The cooling device is fixedly installed on both sides of the axial direction of the wire groove to the coil frame, and it cooperates with the coil frame for heat exchange on both sides of the axial direction of the wire groove.

9. The superconducting magnet according to claim 8, characterized in that, The coil frame is provided with a plurality of connecting grooves on each side of the axial direction of the wire groove, and the cooling device includes a connecting part embedded in the connecting groove. The cooling device is fixedly installed to the coil frame through the connecting part.

10. A magnetic resonance imaging device, characterized in that, include: The superconducting magnet according to any one of claims 1-9.

Images