Ultra-high-speed maglev vehicle-mounted low-temperature storage tank and superconducting magnet

Abstract

This invention relates to the field of ultra-high-speed magnetic levitation technology, and discloses an ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank and a superconducting magnet. The cryogenic storage tank includes a cryogenic tank shell, a support assembly, and an inner tank. The support assembly includes a rigid support member for the inner tank, a thermal insulation support member for the inner tank, a radiation shield, and a Z-shaped support member. One end of the rigid support member is connected to the inner layer of the cryogenic tank shell, and the other end is connected to the thermal insulation support member for the inner tank. The thermal insulation support member has an inner protrusion and an outer protrusion, with the inner protrusion located within the outer protrusion. The radiation shield is connected to the thermal insulation support member for the inner tank via the outer protrusion. The Z-shaped support member is connected to the thermal insulation support member for the inner tank via the inner protrusion. The inner tank is located inside the cryogenic tank shell for storing the refrigerant medium and is connected to the Z-shaped support member. This invention solves the problems of large heat leakage and weak impact / vibration resistance in the support of the refrigerant storage tank in the vehicle-mounted refrigeration system for ultra-high-speed magnetic levitation superconducting magnets.

Description

Technical Field

[0001] This invention relates to the field of ultra-high-speed magnetic levitation technology, and in particular to an ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank and a superconducting magnet. Background Technology

[0002] Cryogenic liquid (liquid nitrogen, liquid helium) storage tanks (referred to as "cryo-storage tanks") are core equipment for maintaining the cryogenic working environment of superconducting magnets in electric maglev trains and ultra-high-speed vacuum tube maglev trains. Once the superconducting magnet has completed cooling and entered the superconducting state, its operating temperature is 4.2K. The cryogenic tank is installed on top of the magnet body and contains liquid helium and liquid nitrogen storage tanks. The stored liquid helium and liquid nitrogen continuously supply cooling energy to the superconducting coils and cooling screens, balancing the heat leakage generated by conduction and radiation within the magnet body through the evaporation of the cryogenic cooling medium. This maintains the extremely low-temperature working environment of the superconducting magnet, ensuring the safe and stable operation of the system.

[0003] The cryogenic storage tank has a vacuum-sandwich structure, and the liquid nitrogen and liquid helium storage tanks also require support structures to connect to the outer shell. Furthermore, the superconducting maglev train inevitably experiences vibrations and impacts on the onboard cryogenic storage tanks during operation. Therefore, the amount of heat leakage and the impact and vibration resistance of the support structure for the liquid helium and liquid nitrogen storage tanks directly affect the storage and consumption of the cryogenic medium, thus impacting the cryogenic maintenance and sustainable operating time of the superconducting magnet.

[0004] However, the primary objectives of existing cryogenic storage tanks for liquid nitrogen, liquid helium, and other cryogenic media are twofold: first, to store cryogenic liquids long-term in a static environment, with the main goal of reducing static heat leakage, without considering vibration resistance, impact resistance, lightweight design, or size; and second, to transport cryogenic liquids, also aiming to reduce heat leakage and minimize transportation losses. As the transport object, the cryogenic storage tank can be equipped with external vibration damping measures, and its internal support structure can be appropriately weakened in terms of vibration and impact resistance. Furthermore, transport vehicles are mostly trucks, railways, or ships, which offer large space and high load capacity, with minimal restrictions on the volume and weight of the transported object. To meet these requirements, existing cryogenic liquid storage tanks typically use multi-point composite tie rods to connect the inner tank and outer shell across temperature zones, using long tie rods to extend the heat conduction path and reduce heat leakage. The outer shell is made of stainless steel or carbon steel to increase the tank's rigidity. Therefore, existing cryogenic storage tanks are characterized by a tie-rod-based internal support system, resulting in low heat leakage but weak vibration resistance, heavy weight, and large volume, which does not meet the requirements for cryogenic storage tanks used in ultra-high-speed magnetic levitation. Summary of the Invention

[0005] This invention provides an ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank and a superconducting magnet, which can solve the technical problems in the prior art.

[0006] This invention provides an ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank, wherein the cryogenic storage tank includes a cryogenic storage tank shell, a support assembly, and an inner tank. The support assembly includes an inner tank rigid support member, an inner tank thermal insulation support member, a radiation shield, and a Z-shaped support member. One end of the inner tank rigid support member is connected to the inner layer of the cryogenic storage tank shell, and the other end is connected to the inner tank thermal insulation support member. The inner tank thermal insulation support member is provided with an inner protrusion and an outer protrusion, the inner protrusion being located within the outer protrusion. The radiation shield is connected to the inner tank thermal insulation support member through the outer protrusion. The Z-shaped support member is connected to the inner tank thermal insulation support member through the inner protrusion. The inner tank is disposed within the cryogenic storage tank shell for storing a refrigerant, and the inner tank is connected to the Z-shaped support member.

[0007] Preferably, the cryogenic storage tank is a circular tank, and the number of the support components is three sets, which are evenly arranged along the circumference.

[0008] Preferably, the inner layer of the cryogenic storage tank shell is provided with studs, one end of the inner tank rigid support is provided with a through hole, the through hole cooperates with the stud to realize the connection between the inner tank rigid support and the cryogenic storage tank shell, and the other end of the inner tank rigid support is fastened to the inner tank insulation support by bolts or adhesive.

[0009] Preferably, the inner groove is provided with an inner groove protrusion, and the inner groove is connected to the Z-shaped support member through the inner groove protrusion.

[0010] Preferably, the radiation shield is connected to the cooling medium via a soft copper wire.

[0011] Preferably, the outer shell of the cryogenic storage tank and the inner tank are separated by a vacuum interlayer.

[0012] Preferably, the material of the inner groove rigid support is stainless steel or titanium alloy.

[0013] Preferably, the inner groove heat insulation support and the Z-shaped support are made of fiberglass or carbon fiber.

[0014] Preferably, the material of the radiation shield is aluminum alloy or oxygen-free copper.

[0015] The present invention also provides a superconducting magnet, which includes the above-mentioned ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank.

[0016] The above technical solution can significantly reduce heat leakage from the support of the cryogenic medium storage tank (inner tank) while meeting the operational requirements of ultra-high-speed maglev trains. This allows for long-term storage of the cryogenic medium and a continuous supply of cooling energy to the superconducting magnet. Therefore, it solves the problems of large heat leakage and weak shock / vibration resistance in the support of the cryogenic medium (liquid nitrogen or liquid helium) storage tank in the onboard refrigeration system of the superconducting magnet for ultra-high-speed maglev trains. It ensures that the insulation support of the onboard cryogenic storage tank has a certain shock / vibration resistance while meeting the requirement of low heat leakage, adapting to the operating environment of ultra-high-speed maglev trains and reducing the consumption of cryogenic medium. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0018] Figure 1 A schematic diagram of the structure of an ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to an embodiment of the present invention is shown;

[0019] Figure 2 An axonometric view of an ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to an embodiment of the present invention is shown;

[0020] Figure 3 A schematic diagram of the support components of an ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to an embodiment of the present invention is shown, with three points evenly distributed along the circumference. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0024] Figure 1 A schematic diagram of the structure of an ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to an embodiment of the present invention is shown.

[0025] like Figure 1-2 As shown in the figure, this embodiment of the invention provides an ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank, wherein the cryogenic storage tank includes a cryogenic storage tank shell 1, a support assembly and an inner tank 6. The support assembly includes an inner tank rigid support 2, an inner tank thermal insulation support 3, a radiation shield 4 and a Z-shaped support 5. One end of the inner tank rigid support 2 is connected to the inner layer of the cryogenic storage tank shell 1, and the other end is connected to the inner tank thermal insulation support 3. The inner tank thermal insulation support 3 is provided with an inner protrusion and an outer protrusion, the inner protrusion being located inside the outer protrusion. The radiation shield 4 is connected to the inner tank thermal insulation support 3 through the outer protrusion. The Z-shaped support 5 is connected to the inner tank thermal insulation support 3 through the inner protrusion. The inner tank 6 is disposed inside the cryogenic storage tank shell 1 for storing a refrigerant, and the inner tank 6 is connected to the Z-shaped support 5.

[0026] This allows for complete fixation of the inner tank to the outer shell. By installing a radiation shield, heat loss can be contained, with the containment temperature set between 77K and 80K. The radiation shield serves the dual function of reducing radiative heat leakage and containing heat loss.

[0027] The above technical solution can significantly reduce heat leakage from the support of the cryogenic medium storage tank (inner tank) while meeting the operational requirements of ultra-high-speed maglev trains. This allows for long-term storage of the cryogenic medium and a continuous supply of cooling energy to the superconducting magnet. Therefore, it solves the problems of large heat leakage and weak shock / vibration resistance in the support of the cryogenic medium (liquid nitrogen or liquid helium) storage tank in the onboard refrigeration system of the superconducting magnet for ultra-high-speed maglev trains. It ensures that the insulation support of the onboard cryogenic storage tank has a certain shock / vibration resistance while meeting the requirement of low heat leakage, adapting to the operating environment of ultra-high-speed maglev trains and reducing the consumption of cryogenic medium.

[0028] The spacing between the inner and outer protrusions can be optimized according to the requirements of the external space to extend the heat conduction distance, but this invention does not limit this.

[0029] According to one embodiment of the present invention, such as Figure 3 As shown, the cryogenic storage tank is a circular tank, and the number of support components is three sets, which are evenly arranged along the circumference.

[0030] Those skilled in the art should understand that, although Figure 3 Only three sets of support components are shown in the figure, but the present invention is not limited to this. Four sets of support components can also be used, evenly arranged along the circumference.

[0031] According to one embodiment of the present invention, the inner layer of the cryogenic storage tank shell 1 is provided with studs, one end of the inner tank rigid support member 2 is provided with a through hole, the through hole cooperates with the stud to realize the connection between the inner tank rigid support member 2 and the cryogenic storage tank shell 1, and the other end of the inner tank rigid support member 2 is fastened to the inner tank thermal insulation support member 3 by bolts or adhesive.

[0032] For example, the inner tank rigid support 2 can be securely connected to the cryogenic storage tank shell 1 by tightening the bolt inserted into the through hole with a nut. The adhesive can be cryogenic epoxy.

[0033] This reduces the contact area and further reduces heat leakage.

[0034] According to one embodiment of the present invention, the inner groove 6 is provided with an inner groove protrusion, and the inner groove 6 is connected to the Z-shaped support member 5 through the inner groove protrusion.

[0035] According to one embodiment of the present invention, the radiation shield 4 is connected to the cooling medium via a soft copper wire.

[0036] Therefore, the temperature of the radiation shield can be controlled at around 80K.

[0037] Alternatively, the radiation shield can also be directly connected to the cooling medium (inner tank).

[0038] According to one embodiment of the present invention, a vacuum interlayer is formed between the outer shell 1 of the cryogenic storage tank and the inner tank 6.

[0039] By employing, for example, a high-vacuum jacket, convective heat transfer within the inner tank can be eliminated, further reducing heat leakage.

[0040] The outer shell of the storage tank can be made of aluminum alloy sheet material rolled into a cylindrical shape and sealed and welded, achieving a lightweight design. The inner tank can be made of stainless steel sheet rolled into a cylindrical shape and sealed and welded, preferably 304, 304L, 316, 316L, 316LN and other low-temperature resistant non-magnetic stainless steel.

[0041] According to one embodiment of the present invention, the material of the inner groove rigid support 2 is stainless steel or titanium alloy.

[0042] This can improve the rigidity of the support.

[0043] Other high-modulus composite materials can also be used for the rigid support components of the inner groove.

[0044] According to one embodiment of the present invention, the materials of the inner groove heat insulation support 3 and the Z-shaped support 5 are fiberglass (e.g., anodized fiberglass G10 / G11) or carbon fiber.

[0045] This reduces heat leakage in the low-temperature section of the inner tank.

[0046] The inner groove insulation support 3 and the Z-shaped support 5 can also be made of other composite materials with low thermal conductivity, such as aluminum alloy fiber.

[0047] For Z-shaped supports, the heat loss due to heat conduction can be further reduced by designing their length.

[0048] According to one embodiment of the present invention, the material of the radiation shield 4 is aluminum alloy or oxygen-free copper.

[0049] For example, radiation shields can be made of high-purity aluminum alloy.

[0050] This reduces radiative heat leakage in the refrigerant storage section.

[0051] In this invention, the refrigerant can be liquid helium or liquid nitrogen. Taking liquid helium as an example, the heat conduction path is as follows: inner tank protrusion of inner tank 6 (4.2K) → Z-shaped support 5 → inner protrusion of inner tank insulation support 3 → outer protrusion of inner tank insulation support 3 (~80K) → inner tank rigid support 2 → cryogenic storage tank shell 1 (~300K).

[0052] The present invention also provides a superconducting magnet, which includes the ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank described in the above embodiments.

[0053] As can be seen from the above embodiments, the ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank described in the above embodiments of the present invention, while meeting the requirements of limited space and lightweight, reduces conductive heat leakage and radiative heat leakage through multiple means such as multi-layer turning structure + low heat leakage composite material + rigid support + high reflectivity shielding layer heat interception, and high vacuum interlayer to eliminate convective heat transfer. Compared with the prior art, the present invention has at least the following advantages:

[0054] 1) This invention can meet the requirements of low heat leakage (including conduction, radiation and convection heat leakage) of cryogenic storage tanks, while reducing the outer dimensions of the storage tank, making the tank structure compact and lightweight, and reducing the weight of the maglev vehicle.

[0055] 2) This invention is applicable to the horizontal / vertical / inclined placement of cryogenic storage tanks, and can meet the thermal insulation support requirements of storage tanks for different suspension attitudes of maglev vehicles;

[0056] 3) This invention can be extended to the support of existing liquid nitrogen / liquid helium cryogenic transport tanks, improving the vibration and impact resistance of existing tanks.

[0057] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-speed magnetic levitation vehicle-mounted cryogenic storage tank, characterized in that, The cryogenic storage tank includes a cryogenic storage tank shell (1), a support assembly, and an inner tank (6). The support assembly includes an inner tank rigid support (2), an inner tank thermal insulation support (3), a radiation shield (4), and a Z-shaped support (5). One end of the inner tank rigid support (2) is connected to the inner layer of the cryogenic storage tank shell (1), and the other end is connected to the inner tank thermal insulation support (3). The inner tank thermal insulation support (3) is provided with an inner protrusion and an outer protrusion. The inner protrusion is located inside the outer protrusion. The radiation shield (4) is connected to the inner tank thermal insulation support (3) through the outer protrusion. The Z-shaped support (5) is connected to the inner tank thermal insulation support (3) through the inner protrusion. The inner tank (6) is located inside the cryogenic storage tank shell (1) for storing refrigerant. The inner tank (6) is connected to the Z-shaped support (5).

2. The ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to claim 1, characterized in that, The cryogenic storage tank is a circular tank, and the number of the support components is three sets, which are evenly arranged along the circumference.

3. The ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to claim 2, characterized in that, The inner layer of the cryogenic storage tank shell (1) is provided with studs, and one end of the inner tank rigid support member (2) is provided with a through hole. The through hole cooperates with the stud to realize the connection between the inner tank rigid support member (2) and the cryogenic storage tank shell (1). The other end of the inner tank rigid support member (2) is fastened to the inner tank insulation support member (3) by bolts or adhesive.

4. The ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to claim 3, characterized in that, The inner groove (6) is provided with an inner groove protrusion, and the inner groove (6) is connected to the Z-shaped support (5) through the inner groove protrusion.

5. The cryogenic storage tank according to claim 4, characterized in that, The radiation shield (4) is connected to the cooling medium via a soft copper wire.

6. The ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to any one of claims 1-5, characterized in that, The outer shell (1) of the cryogenic storage tank and the inner tank (6) are separated by a vacuum interlayer.

7. The ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to any one of claims 1-5, characterized in that, The material of the inner groove rigid support (2) is stainless steel or titanium alloy.

8. The ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to any one of claims 1-5, characterized in that, The inner groove heat insulation support (3) and the Z-shaped support (5) are made of fiberglass or carbon fiber.

9. The ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank according to any one of claims 1-5, characterized in that, The material of the radiation shield (4) is aluminum alloy or oxygen-free copper.

10. A superconducting magnet, characterized in that, The ultra-high-speed magnetic levitation vehicle-mounted cryogenic storage tank includes any one of claims 1-9.

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