Nitrogen fixation cavity and coil box integrated device

Abstract

The invention relates to the technical field of superconducting magnets, and discloses a nitrogen fixation cavity and coil box integrated device. The device comprises a nitrogen fixation cavity, a coil box, an outer framework supporting piece, an inner framework supporting piece and a force transmission reinforcing rib, the coil box is arranged in the nitrogen fixation cavity and used for arranging a high-temperature superconducting coil, and the outer framework supporting piece is arranged on the outer side of the coil box and used for resisting Lorentz force. The inner framework supporting piece is arranged in the coil box and used for guaranteeing the axial coaxiality of high-temperature superconducting coil assembly, and the force transmission reinforcing rib is arranged between the nitrogen fixation cavity and the coil box and used for reinforcing force transmission between the nitrogen fixation cavity and the coil box. Therefore, a high-temperature superconducting tape curing process can be considered at the same time, the structural force transmission performance is good, and certain quench protection capability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting magnets, and particularly to an integrated device of a nitrogen fixation cavity and a coil box. Background Art

[0002] The three critical conditions of superconductors: critical temperature, critical magnetic field, and critical current. Only below the critical temperature and magnetic field does the coil have a certain current-carrying capacity. The critical temperature is a prerequisite for superconducting magnets. The magnet conducts and cools the superconducting coil through cryogenic working fluid liquid helium (low-temperature coil), liquid nitrogen / solid nitrogen (high-temperature coil), or a refrigerator. The critical current is usually the lower limit of the current-carrying capacity under the self-field and back-field of the magnet. When the superconductor is higher than any one of the critical conditions, the superconducting state will turn into the normal conducting state.

[0003] Due to the relatively high current density, superconducting magnets can form a relatively large magnetic field, and have advantages such as light weight, small volume, and low loss. Superconducting magnets are divided into low-temperature superconducting magnets and high-temperature superconducting magnets. Among them, currently, low-temperature superconducting magnets have been widely used in fields such as nuclear fusion, accelerators, and MRI. High-temperature superconducting materials were discovered later than low-temperature superconducting tapes, and their applications are relatively lagging behind. Compared with low-temperature superconducting tapes, high-temperature superconducting tapes have a higher upper critical field, a higher operating temperature, a higher critical current density. The magnets wound from them can provide a higher magnetic field, and for dynamic superconducting magnets, they can provide a higher electromagnetic force. Due to the limitations of the tape length, high cost, and difficulty in protecting against quenching, currently, most of them are laboratory prototypes.

[0004] The operating temperature of high-temperature superconducting magnets is relatively high. In dynamic superconducting magnets, the solid nitrogen protection and cooling method is a relatively mainstream cooling method. High-temperature superconducting magnets using solid nitrogen cooling usually require a nitrogen fixation cavity. Currently, the impregnation process of high-temperature superconducting magnets requires being placed in a coil box for impregnation and curing after the coil winding is completed, which will result in a highly complex structure of high-temperature superconducting magnets. Currently, one method is to wind high-temperature superconducting coils by using an independent coil skeleton winding method, and strengthen the integrity of the coil by adding a binding tape structure outside, and then fix it in the nitrogen fixation cavity through mechanical connection methods such as bolts or welders to form a low-temperature container of the superconducting magnet; another method is to use the coil box for coil solid nitrogen fixation and the conduction cooling method of the refrigerator after winding.

[0005] The current two technologies: one is to directly wind the coil skeleton and bind it with a stainless steel tape, and place it in the nitrogen fixation cavity. Its disadvantages mainly include the following points: complex structure, requiring additional binding technology to resist the electromagnetic force of the coil, more assembly processes, and poor force transmission performance of the non-integrated connection structure; the other is to use the coil box for coil solid nitrogen fixation and the conduction cooling method of the refrigerator. The superconducting coil does not use solid nitrogen as the cooling medium, has a small heat capacity, and has no protection against quenching. Summary of the Invention

[0006] The present invention provides an integrated device of a nitrogen fixation cavity and a coil box, which can solve the technical problems in the prior art.

[0007] The present invention provides an integrated device of a nitrogen fixation cavity and a coil box, wherein the device includes a nitrogen fixation cavity, a coil box, an outer skeleton support, an inner skeleton support, and a force transmission reinforcing rib. The coil box is arranged inside the nitrogen fixation cavity and is used for arranging a high-temperature superconducting coil. The outer skeleton support is arranged outside the coil box for resisting the Lorentz force. The inner skeleton support is arranged inside the coil box for ensuring the axial coaxiality of the assembly of the high-temperature superconducting coil. The force transmission reinforcing rib is arranged between the nitrogen fixation cavity and the coil box for strengthening the force transmission between the nitrogen fixation cavity and the coil box.

[0008] Preferably, the high-temperature superconducting coil is cured by epoxy resin.

[0009] Preferably, the high-temperature superconducting coil is cured by paraffin.

[0010] Preferably, the high-temperature superconducting coil is wound into a pancake structure, and the pancake structures are connected in series.

[0011] Preferably, the high-temperature superconducting coil adopts first-generation BSCCO tape and / or second-generation ReBCO tape and other tapes.

[0012] Preferably, the nitrogen fixation cavity includes a cavity body and a nitrogen fixation cavity cover plate, and the cavity body and the nitrogen fixation cavity cover plate are connected by a screwing method or a welding method.

[0013] Preferably, the coil box includes a box body and a coil box cover plate, and the box body and the coil box cover plate are connected by a welding method.

[0014] Through the above technical solutions, the coil box can be arranged inside the nitrogen fixation cavity, and the inner skeleton support and the outer skeleton support are respectively arranged inside and outside the coil box, and the force transmission reinforcing rib is arranged between the nitrogen fixation cavity and the coil box to form an integrated device of the nitrogen fixation cavity and the coil box. Thus, the curing process of the high-temperature superconducting tape can be taken into account at the same time, the structural force transmission performance is good, and it has a certain quench protection ability. Description of the Drawings

[0015] The included drawings are used to provide a further understanding of the embodiments of the present invention. They form a part of the specification, are used to illustrate the embodiments of the present invention, and are used to explain the principles of the present invention together with the text description. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1Shows a schematic diagram of an integrated device of a nitrogen fixation chamber and a coil box according to an embodiment of the present invention;

[0017] Figures 2A-2B Shows a general assembly schematic diagram of an integrated device of a nitrogen fixation chamber and a coil box according to an embodiment of the present invention. Detailed implementation manners

[0018] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0019] It should be noted that the terms used herein are only for describing the specific implementation manners 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, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0021] Figure 1 Shows a schematic diagram of an integrated device of a nitrogen fixation chamber and a coil box according to an embodiment of the present invention.

[0022] As Figure 1As shown in the figure, an embodiment of the present invention provides an integrated device of a nitrogen fixation cavity and a coil box. The device includes a nitrogen fixation cavity 10, a coil box 20, an outer skeleton support 30, an inner skeleton support 40, and a force transmission reinforcing rib 50. The coil box 20 is arranged inside the nitrogen fixation cavity 10 and is used for arranging a high-temperature superconducting coil. The outer skeleton support 30 is arranged outside the coil box 20 to resist the Lorentz force. The inner skeleton support 40 is arranged inside the coil box 20 to ensure the axial coaxiality of the assembly of the high-temperature superconducting coil. The force transmission reinforcing rib 50 is arranged between the nitrogen fixation cavity 10 and the coil box 20 to strengthen the force transmission between the nitrogen fixation cavity 10 and the coil box 20.

[0023] That is, the outer skeleton support bears the Lorentz force and the cold shrinkage force of the system well.

[0024] Through the above technical solution, the coil box can be arranged inside the nitrogen fixation cavity, and the inner skeleton support and the outer skeleton support are respectively arranged inside and outside the coil box, and the force transmission reinforcing rib is arranged between the nitrogen fixation cavity and the coil box to form an integrated device of the nitrogen fixation cavity and the coil box. Thus, the curing process of the high-temperature superconducting tape can be taken into account at the same time, the structural force transmission performance is good, and it has a certain quench protection ability.

[0025] According to an embodiment of the present invention, as shown in Figure 2, the high-temperature superconducting coil 3 is cured by epoxy resin 2.

[0026] Epoxy resin 2 has a certain fluidity under heating conditions and can be impregnated around the high-temperature superconducting coil 3, thereby isolating the nitrogen fixation from the high-temperature superconducting coil and preventing the low-temperature cold shrinkage force from damaging the high-temperature superconducting tape during the nitrogen fixation generation process at low temperature.

[0027] According to an embodiment of the present invention, alternatively, the high-temperature superconducting coil 3 is cured by paraffin.

[0028] According to an embodiment of the present invention, the high-temperature superconducting coil 3 is wound into a pancake structure, and the pancake structures are connected in series.

[0029] That is, the high-temperature superconducting coil 3 is mostly wound into a series of pancake structures.

[0030] According to an embodiment of the present invention, the high-temperature superconducting coil 3 adopts first-generation BSCCO tape and / or second-generation ReBCO tape and other tapes.

[0031] According to an embodiment of the present invention, as shown in Figure 2, the nitrogen fixation cavity 10 includes a cavity body and a nitrogen fixation cavity cover plate 5, and the cavity body and the nitrogen fixation cavity cover plate 5 are connected by a screwing method or a welding method.

[0032] According to an embodiment of the present invention, as shown in FIG. 2, the coil box 20 includes a box body and a coil box cover plate 4, and the box body and the coil box cover plate 4 are connected by welding.

[0033] The assembly process of the nitrogen fixation cavity and coil box integrated device according to the present invention will be described below with reference to examples.

[0034] Referring to FIG. 2, in the first step, the high-temperature superconducting coil 3 is placed in the nitrogen fixation cavity and coil box integrated device 1, and epoxy resin is provided in the coil box. In the second step, the coil box cover plate 4 is installed. In the third step, the above structure is placed in a vacuum impregnation furnace to form a cured structure of the epoxy resin 2. In the fourth step, the excess epoxy resin is cleaned. In the fifth step, the nitrogen fixation cavity cover plate 5 is installed. In the sixth step, liquid nitrogen is injected, and nitrogen fixation 6 is formed through conduction cooling.

[0035] Among them, for the generation of nitrogen fixation 6, it can be refrigerated by the conduction cooling of a refrigerator, or it can be obtained by the circulation refrigeration of cold helium gas.

[0036] The nitrogen fixation cavity and coil box integrated device according to the present invention can be manufactured by machining. The manufactured nitrogen fixation cavity and coil box integrated device can be placed in a vacuum dewar for cooling. Adopting an integrated structure can simplify the structure assembly process, and multiple components become one part, improving the reliability of the part.

[0037] The nitrogen fixation cavity and coil box integrated device according to the present invention can also be in a bilaterally symmetric structural form, and the specific structure can change with the change of the magnet structure, and the present invention does not limit this.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0039] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations of the spatial relative descriptions used herein will be made.

[0040] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of differentiating the corresponding components. Without further statement, these terms have no special meaning, and thus should not be construed as limiting the scope of protection of the present invention.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A nitrogen fixing chamber and coil box integrated device, characterized in that: The device comprises a nitrogen fixing chamber (10), a coil box (20), an outer frame support member (30), an inner frame support member (40) and a force transmission reinforcement rib (50); the coil box (20) is arranged in the nitrogen fixing chamber (10) and is used to arrange a high-temperature superconducting coil; the outer frame support member (30) is arranged outside the coil box (20) to resist the Lorentz force; the inner frame support member (40) is arranged in the coil box (20) to ensure the axial coaxiality of the high-temperature superconducting coil assembly; and the force transmission reinforcement rib (50) is arranged between the nitrogen fixing chamber (10) and the coil box (20) to strengthen the force transmission between the nitrogen fixing chamber (10) and the coil box (20).

2. The device according to claim 1, characterized in that The high-temperature superconducting coil (3) is cured by epoxy resin (2).

3. The device according to claim 1, characterized in that The high temperature superconducting coil (3) is solidified by paraffin.

4. The device according to claim 2 or 3, characterized in that The high temperature superconducting coil (3) is wound into a pancake-shaped structure, and the pancake-shaped structures are connected in series.

5. The device according to claim 3, characterized in that The high temperature superconducting coil (3) is made of first generation BSCCO tape and / or second generation ReBCO tape.

6. The device according to claim 5, characterized in that The nitrogen fixing chamber (10) comprises a chamber body and a nitrogen fixing chamber cover plate (5), and the chamber body and the nitrogen fixing chamber cover plate (5) are connected by screw connection or welding.

7. The device according to claim 6, characterized in that The coil box (20) comprises a box body and a coil box cover plate (4), and the box body and the coil box cover plate (4) are connected by welding.

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