Damping device suitable for dynamic superconducting magnet and dynamic superconducting magnet

Abstract

The present invention relates to the technical field of superconducting magnets, and discloses a damping device suitable for a dynamic superconducting magnet and a dynamic superconducting magnet. The device comprises a support unit, a sleeve piston, a flange sleeve, one or more O-type structural units and a cylindrical wear-resistant sleeve, one end of the support unit is connected to a cold shield, and the other end is connected to the sleeve piston, one or more O-type structural units are embedded in the groove of the flange sleeve, the sleeve piston is inserted into the flange sleeve after the cylindrical wear-resistant sleeve is embedded in the sleeve piston, and the flange sleeve is connected to the inner surface of the outer dewar. Thus, the magnet quenching caused by the introduction of a large heat source due to the vibration of the cold shield and the eddy current heating of the cold shield and the inner dewar is avoided, and the anti-quenching ability of the dynamic superconducting magnet is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting magnets, and in particular to a damping device suitable for a dynamic superconducting magnet and a dynamic superconducting magnet. Background Art

[0002] Superconducting magnets are vacuum sandwich structures composed of superconducting coils, internal and external dewars, cold shields, and thermal insulation wrapping materials. When the superconducting coils enter the superconducting state and a large current is passed through them, the superconducting magnets will provide a strong magnetic field (up to tens of Tesla) for the external environment. Therefore, superconducting magnets have important applications in MRI, nuclear magnetic resonance, superconducting maglev trains, etc., and are the core components that enable them to work.

[0003] For the superconducting coil to enter the superconducting state, an extremely low operating temperature is required. At present, the operating temperature of low-temperature superconducting wires used in engineering is 4.2k, such as NiTi, Ni3Sn and other superconducting wires; the operating temperature of high-temperature superconducting wires, such as REBCO, is generally 30k~50k. Regardless of whether the superconducting magnet uses low-temperature superconducting wires or high-temperature superconducting wires, its operating temperature will be below -196℃, which is an extremely low temperature environment. In order to ensure the low-temperature working environment of the magnet, the superconducting magnet body is designed with a vacuum interlayer dewar to reduce air convection heat exchange, and a low heat leakage support structure is used to reduce conduction heat leakage. In addition, radiation heat leakage can also be reduced by cold screens (such as aluminum screens, CFRP, etc.).

[0004] The cold shield of a static superconducting magnet is often connected to the main load-bearing structure by bolts. Normally, the cold shield only needs to be reliably fixed, so it is only necessary to consider the tightness of the cold shield installation to prevent loosening and falling off. However, under load fluctuation conditions such as electromagnetic thrust, braking force, and guiding force, the dynamic superconducting magnet will cause vibrations in the internal structure of the magnet, such as the cold shield, helium tank, and superconducting coil. Since the superconducting coil generates a strong magnetic field, the cold shield vibrates in a strong magnetic environment, and eddy currents are generated on the surface. The fluctuating magnetic field generated by the eddy currents will induce currents on the surface of the helium tank, causing the cold shield and the helium tank to heat up at the same time, causing the operating temperature of the superconducting coil to rise, and a quench fault condition to occur. Therefore, a device that can suppress or eliminate the vibration of the cold shield is needed. Summary of the invention

[0005] The present invention provides a damping device suitable for a dynamic superconducting magnet and a dynamic superconducting magnet, which can solve the technical problems in the prior art.

[0006] The present invention provides a damping device suitable for a dynamic superconducting magnet, wherein the device comprises a support unit, a sleeve piston, a flange sleeve, one or more O-type structural units and a cylindrical wear-resistant sleeve, one end of the support unit is connected to a cold screen, and the other end is connected to the sleeve piston, one or more O-type structural units are embedded in a groove of the flange sleeve, after the cylindrical wear-resistant sleeve is embedded in the sleeve piston, the sleeve piston is inserted into the flange sleeve, and the flange sleeve is connected to the inner surface of an outer dewar.

[0007] Preferably, the support unit is a three-point rod-shaped support member.

[0008] Preferably, the three-point rod-shaped support member comprises an upper support layer, a lower support layer and three support rods, and the three support rods are arranged between the upper support layer and the lower support layer.

[0009] Preferably, the material of the O-shaped structural unit is metal rubber, wear-resistant composite material or wear-resistant metal material.

[0010] Preferably, the materials of the plurality of O-shaped structural units are the same or different.

[0011] Preferably, the material of the cylindrical wear-resistant sleeve is a metal material or a composite material, and the outer surface of the cylindrical wear-resistant sleeve is processed by shot peening and / or coating.

[0012] Preferably, the support unit, the sleeve piston and the flange sleeve are made of epoxy glass fiber, epoxy carbon fiber, epoxy aluminum oxide fiber or G10 / G11.

[0013] Preferably, the support unit and the sleeve piston are of a split structure or an integrated structure.

[0014] Preferably, the support unit and the cold shield are fixedly connected by bolts, and the flange sleeve and the outer dewar are fixedly connected by bolts.

[0015] The present invention also provides a dynamic superconducting magnet, wherein the dynamic superconducting magnet comprises the above-mentioned damping device applicable to the dynamic superconducting magnet.

[0016] Through the above technical scheme, the amplitude and frequency control of the dynamic superconducting magnet cold shield can be achieved, and the vibration can be quickly attenuated, thereby avoiding the magnet quenching caused by the introduction of a large heat source due to the cold shield vibration and the heating of the cold shield and the internal Dewar eddy current, thereby improving the anti-quenching ability of the dynamic superconducting magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of a damping device applicable to a dynamic superconducting magnet according to an embodiment of the present invention is shown;

[0019] Figure 2 A schematic diagram of the working principle of a damping device suitable for a dynamic superconducting magnet according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0023] Figure 1 A schematic structural diagram of a damping device applicable to a dynamic superconducting magnet according to an embodiment of the present invention is shown.

[0024] Figure 2 A schematic diagram of the working principle of a damping device suitable for a dynamic superconducting magnet according to an embodiment of the present invention is shown.

[0025] like Figure 1 and 2 As shown, an embodiment of the present invention provides a damping device suitable for a dynamic superconducting magnet, wherein the device includes a support unit 2, a sleeve piston 3, a flange sleeve 4, one or more O-type structural units 5 and a cylindrical wear-resistant sleeve 6, one end of the support unit 2 is connected to the cold screen 1, and the other end is connected to the sleeve piston 3, one or more O-type structural units 5 are embedded in the groove of the flange sleeve 4, the cylindrical wear-resistant sleeve 6 is embedded in the sleeve piston 3 (the cylindrical wear-resistant sleeve 6 is embedded on the outer surface of the sleeve piston 3), and then the sleeve piston 3 is inserted into the flange sleeve 4 (that is, one or more O-type structural units 5 and the cylindrical wear-resistant sleeve 6 form a single or multiple dry friction pairs, so that the friction pairs are placed between the sleeve piston 3 and the flange sleeve 4), and the flange sleeve 4 is connected to the inner surface (inner wall) of the outer dewar 7.

[0026] Among them, when the cold screen 1 vibrates due to some kind of excitation, the support unit 2 drives the sleeve piston 3 to reciprocate in the flange sleeve 4, and the O-type structural unit 5 arranged in the groove of the flange sleeve 4 and the cylindrical wear-resistant sleeve 6 arranged on the sleeve piston 3 form a line contact dry friction pair (that is, the O-type structural unit 5 and the wear-resistant sleeve are squeezed and moved relative to each other, increasing the friction loss and doing work), which quickly consumes the vibration energy, increases the vibration damping of the cold screen, controls the amplitude and frequency, and quickly attenuates the vibration, thereby suppressing or eliminating the vibration of the cold screen.

[0027] For example, the O-shaped structural unit may be in the shape of a ring (O-ring). The cylindrical wear-resistant sleeve 6 may be a cylindrical wear-resistant thin-wall sleeve.

[0028] Through the above technical scheme, the damping support between the cold shield and the outer Dewar can be completed, the amplitude and frequency control of the dynamic superconducting magnet cold shield can be realized, and the vibration can be quickly attenuated (that is, the amplitude of the dynamic superconducting magnet cold shield is reduced and the vibration is quickly attenuated), thereby avoiding the magnet quenching caused by the introduction of a large heat source due to the cold shield vibration and the eddy current heating of the cold shield and the inner Dewar, thereby improving the anti-quenching ability of the dynamic superconducting magnet.

[0029] According to an embodiment of the present invention, the support unit 2 is a three-point rod-shaped support member.

[0030] By adopting a three-point rod-shaped support structure, the balance between rigidity and heat leakage can be taken into account, thereby reducing the heat leakage caused by the damping structure.

[0031] According to an embodiment of the present invention, the three-point rod-shaped support member includes an upper support layer, a lower support layer and three support rods, and the three support rods are arranged between the upper support layer and the lower support layer.

[0032] The upper supporting layer is connected to the sleeve piston 3, the lower supporting layer is connected to the cold screen 1, and three supporting rods can be arranged at equal intervals between the upper supporting layer and the lower supporting layer.

[0033] For example, the support rod can be a solid or hollow circular cross-section rod (i.e., a solid circular rod or a hollow circular rod), preferably a hollow circular rod; the upper support layer and the lower support layer can be hollow discs, and the diameter of the upper support layer is smaller than the diameter of the lower support layer; preferably, the area of ​​the upper support layer is adapted to the area of ​​the sleeve piston 3, for example, the area of ​​the upper support layer and the area of ​​the sleeve piston 3 can be the same.

[0034] Furthermore, the cold screen damping support rigidity and heat leakage balance can be achieved by reducing the cross-sectional area of ​​the support rods, reducing the number of support rod points, etc.

[0035] According to an embodiment of the present invention, the material of the O-shaped structural unit 5 is metal rubber, wear-resistant composite material or wear-resistant metal material.

[0036] Alternatively, the material of the O-type structural unit 5 may also be low-temperature rubber, such as fluororubber, nitrile rubber, etc.

[0037] For example, the wear-resistant composite material may be epoxy glass fiber, epoxy carbon fiber, epoxy aluminum oxide fiber, or the like.

[0038] For example, the wear-resistant metal material may be copper, aluminum or stainless steel.

[0039] According to an embodiment of the present invention, the materials of the plurality of O-type structural units 5 are the same or different.

[0040] That is, when there are multiple O-type structural units 5, the multiple O-type structural units 5 can use the same material or different materials (for example, a part of the multiple O-type structural units 5 use metal rubber and another part use wear-resistant metal material) to form a friction pair with adjustable damping.

[0041] Thereby, the vibration damping can be adjusted without the need for a liquid damping medium, thereby achieving a cold shield suppression effect with no contaminants in the vacuum interlayer of the dynamic superconducting magnet and adjustable damping.

[0042] According to an embodiment of the present invention, the material of the cylindrical wear-resistant sleeve 6 is a metal material or a composite material, and the outer surface of the cylindrical wear-resistant sleeve 6 is processed by shot peening and / or coating.

[0043] The metal material used as the material of the cylindrical wear-resistant sleeve 6 may be copper, aluminum or stainless steel.

[0044] By performing surface treatment (shot peening and / or plating, etc.) on the outer surface of the cylindrical wear-resistant sleeve 6, the surface hardness and wear resistance can be improved.

[0045] In the present invention, composite materials can be used to reduce structural heat leakage by utilizing the high tensile and compressive resistance, extremely low heat leakage characteristics of composite materials, and reducing contact area, so that under low heat leakage conditions, the cold screen vibration can be quickly attenuated and eddy current heating can be reduced.

[0046] According to an embodiment of the present invention, the support unit 2, the sleeve piston 3 and the flange sleeve 4 are made of epoxy glass fiber, epoxy carbon fiber, epoxy aluminum oxide fiber or G10 / G11.

[0047] By adopting the above materials, the advantages of low heat leakage and high compressive strength can be achieved.

[0048] In addition to the materials described above, other materials with high tensile and compressive strength and low heat leakage characteristics can also be used as the materials of the support unit 2, the sleeve piston 3 and the flange sleeve 4 of the present invention.

[0049] According to an embodiment of the present invention, the support unit 2 and the sleeve piston 3 are of a split structure or an integrated structure.

[0050] According to an embodiment of the present invention, the support unit 2 is fixedly connected to the cold shield 1 by bolts, and the flange sleeve 4 is fixedly connected to the outer dewar 7 by bolts.

[0051] Those skilled in the art should understand that the above description of materials is merely exemplary and is not intended to limit the present invention.

[0052] An embodiment of the present invention further provides a dynamic superconducting magnet, wherein the dynamic superconducting magnet includes the damping device applicable to the dynamic superconducting magnet described in the above embodiment.

[0053] For example, in actual application, the position where the dynamic superconducting magnet cold shield vibrates more can be determined first, that is, the damping support installation position can be determined (for example, finite element simulation technology can be used, which will not be repeated here in order not to confuse the present invention); then one end of the three-point tie rod composite support unit can be fixed to the cold shield by bolts, and the other end can be fixed to the sleeve piston of the flange sleeve by bolts; the O-type structural unit is embedded in the groove of the flange sleeve for reliable fixation. The cylindrical thin-walled wear-resistant sleeve is embedded in the groove at one end of the piston and inserted into the flange sleeve; the O-type structural unit and the cylindrical thin-walled wear-resistant sleeve form a line contact dry friction pair. When the cold shield vibrates, the piston is driven to reciprocate in the sleeve by the three-point tie rod support unit, and the dry friction pair consumes the kinetic energy of the movement and quickly attenuates the vibration. In addition, adjusting the static friction of the dry friction can increase the driving force for the cold shield to start vibration. Through the characteristics of high tensile and compressive composite materials, low heat leakage and three-point round rod support, the heat leakage of cold screen conduction can be reduced, and finally the vibration suppression or elimination effect of cold screen with difficulty in starting vibration, fast vibration attenuation and low heat leakage can be achieved.

[0054] It can be seen from the above embodiments that the present invention uses dry friction to control the amplitude and frequency of the cold screen, provides an additional damping form for vibration, and achieves the purpose of difficult cold screen vibration or rapid vibration attenuation; and the use of a high tensile and compressive resistance, low heat leakage composite flange sleeve structure can reduce the support conduction heat leakage, thereby ensuring that the cold screen conduction heat leakage is controllable, increasing the cold screen vibration damping, achieving low heat leakage, cold screen vibration suppression, and reducing the risk of magnet quenching caused by eddy current heating. Thus, the problem of magnet quenching caused by the introduction of a large heat source due to cold screen vibration and eddy current heating between the cold screen and the inner Dewar is solved.

[0055] That is, the present invention utilizes dry friction vibration reduction to control amplitude and frequency, and a dynamic superconducting magnet cold shield vibration damping design method supported by low heat leakage composite materials to suppress or eliminate cold shield vibration, improve the performance of the dynamic superconducting magnet, and make the superconducting magnet suitable for more complex and harsh working conditions.

[0056] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0057] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0058] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A damping device suitable for a dynamic superconducting magnet, characterized in that: The device comprises a support unit (2), a sleeve piston (3), a flange sleeve (4), one or more O-type structural units (5) and a cylindrical wear-resistant sleeve (6); one end of the support unit (2) is connected to the cold shield (1), and the other end is connected to the sleeve piston (3); one or more O-type structural units (5) are embedded in the groove of the flange sleeve (4); after the cylindrical wear-resistant sleeve (6) is embedded in the sleeve piston (3), the sleeve piston (3) is inserted into the flange sleeve (4); the flange sleeve (4) is connected to the inner surface of the outer dewar (7); the support unit (2) is a three-point rod-shaped support member, and the three-point rod-shaped support member comprises an upper support layer, a lower support layer and three support rods; the three support rods are arranged between the upper support layer and the lower support layer; and the support rods are solid or hollow circular cross-section rods.

2. The device according to claim 1, characterized in that The material of the O-shaped structural unit (5) is metal rubber, wear-resistant composite material or wear-resistant metal material.

3. The device according to claim 2, characterized in that The materials of the plurality of O-shaped structural units (5) are the same or different.

4. The device according to claim 1, characterized in that The material of the cylindrical wear-resistant sleeve (6) is a metal material or a composite material, and the outer surface of the cylindrical wear-resistant sleeve (6) is shot peened and / or plated.

5. The device according to claim 1, characterized in that The support unit (2), the sleeve piston (3) and the flange sleeve (4) are made of epoxy glass fiber, epoxy carbon fiber, epoxy aluminum oxide fiber or G10 / G11.

6. The device according to claim 1, characterized in that The support unit (2) and the sleeve piston (3) are of a split structure or an integrated structure.

7. The device according to claim 1, characterized in that The support unit (2) and the cold shield (1) are fixedly connected by bolts, and the flange sleeve (4) and the outer dewar (7) are fixedly connected by bolts.

8. A dynamic superconducting magnet, characterized in that: The dynamic superconducting magnet comprises the damping device applicable to the dynamic superconducting magnet according to any one of claims 1 to 7.

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