A small through-flow high-temperature superconducting current lead insulation section structure

Abstract

This invention discloses a heat insulation section structure for a high-temperature superconducting current lead with low current flow. The structure includes a heat insulation section body with two symmetrically arranged filling grooves on its front side. Several superconducting strips are stacked at the bottom of the filling grooves, and both sides of the superconducting strips are fixed to the filling grooves via brazing. Several stainless steel strips are laid on top of the superconducting strips. This invention is applicable to the field of superconducting magnet technology. By designing a stainless steel central section and two copper ends, with the ends being enlarged, and simultaneously stacking and brazing superconducting strips within the filling grooves, and compacting the top with stainless steel strips to address stress-induced delamination and loose connections, it ensures continuous current flow and temperature isolation between high and low temperature zones, reducing heat leakage between different temperature zones. This invention is highly practical.

Description

Technical Field

[0001] This invention belongs to the field of superconducting magnet technology, specifically a heat insulation section structure for a high-temperature superconducting current lead with low current flow. Background Technology

[0002] Superconducting magnets are a crucial component of high-temperature superconducting tokamak devices. These magnets need to operate at low temperatures and each has two current leads (positive and negative) for power connection. These leads require cooling to ensure the magnet operates within its operating temperature range. The current leads exhibit a temperature gradient from low temperature to room temperature, necessitating a structure to ensure continuous current flow and temperature isolation between the high and low temperature regions, minimizing heat leakage between them. However, existing technologies lack such a thermal insulation structure. Therefore, there is an urgent need to design a thermal insulation section structure for high-temperature superconducting current leads with a small current flow to ensure continuous current flow and temperature isolation between the high and low temperature regions. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a heat insulation section structure for a high-temperature superconducting current lead with low current flow.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A heat insulation section structure for a high-temperature superconducting current lead with low current flow includes a heat insulation section body. Two filling grooves are symmetrically opened on the front of the heat insulation section body. Several superconducting strips are stacked at the bottom of the filling grooves. Both sides of the superconducting strips are fixed to the filling grooves by brazing structures. Several stainless steel strips are laid on the top of the superconducting strips.

[0006] Preferably, the heat insulation section includes a central section and two end caps, the central section being made of stainless steel and the end caps being made of copper.

[0007] Preferably, the end and the center section are connected by a tenon and mortise structure and fixed by brazing.

[0008] Preferably, the width of the end of the end furthest from the center segment is greater than the width of its inner end, and the end is pre-bent at an angle along the length direction according to space requirements.

[0009] Preferably, the two ends adopt a centrally symmetrical structure.

[0010] Preferably, the outer side of the heat insulation section is covered with an insulating layer.

[0011] Preferably, the insulating layer is epoxy glass fiber cloth and KAPTON rewound layer.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0013] In this invention, a stainless steel central section and two copper ends are designed, and the ends are enlarged. At the same time, they are stacked and brazed in the filling groove. The top is covered with stainless steel strips to compact the superconductor to cope with delamination and loose connections caused by stress, ensuring continuous current flow and temperature isolation in high and low temperature zones, reducing heat leakage in different temperature zones, and making it highly practical. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a cross-sectional view of the main body of the heat insulation section of the present invention;

[0016] Figure 3 This is a cross-sectional view of the assembly structure of the present invention.

[0017] Reference numerals: 1. Main body of the heat insulation section; 11. Filling groove; 12. Superconducting tape; 13. Brazing structure; 14. Stainless steel tape; 15. Insulation layer; 2. Center section; 3. End. Detailed Implementation

[0018] The specific embodiments of the present invention are described in detail below.

[0019] The "range" disclosed in this invention is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 10–50 is listed for a specific parameter, it is also expected that ranges of 10–40 and 20–50 are also included. Furthermore, if the minimum range values ​​are 1 and 2, and the maximum range values ​​are 3, 4, and 5, then the following ranges are all expected: 1–3, 1–4, 1–5, 2–3, 2–4, and 2–5. In this application, unless otherwise stated, the numerical range "a–b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0–5" means that all real numbers between "0–5" have been listed herein; "0–5" is merely a shortened representation of these numerical combinations.

[0020] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0021] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0022] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0023] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0024] Unless otherwise specified, the reaction will proceed under normal temperature and pressure conditions.

[0025] Unless otherwise specified, all parts or percentages are by weight or by weight percentage.

[0026] In this invention, all the substances used are known substances that can be purchased or synthesized by known methods.

[0027] In this invention, all the devices or equipment used are conventional devices or equipment known in the art and are readily available.

[0028] The following embodiments further illustrate specific implementations of the low-current high-temperature superconducting current-lead insulation section structure of the present invention. The low-current high-temperature superconducting current-lead insulation section structure of the present invention is not limited to the descriptions in the following embodiments.

[0029] Example 1:

[0030] A low-current high-temperature superconducting current-insulating section structure, such as... Figure 1-3 As shown, the device includes a heat insulation section body 1. Two filling grooves 11 are symmetrically opened on the front of the heat insulation section body 1. Several superconducting strips 12 are stacked at the bottom of the filling grooves 11. Both sides of the superconducting strips 12 are fixed to the filling grooves 11 by brazing structures 13. Several stainless steel strips 14 are laid on the top of the superconducting strips 12.

[0031] In one possible implementation, the heat insulation section body 1 includes a central section 2 and two end caps 3 at both ends. The central section 2 is made of stainless steel, and the end caps 3 are made of copper.

[0032] In one possible implementation, the end 3 and the center segment 2 are connected by a tenon and mortise structure and fixed by brazing.

[0033] In one possible implementation, the width of the end of the end 3 away from the center segment 2 is greater than the width of its inner end, and the end 3 is pre-bent at an angle along the length direction according to space requirements.

[0034] In one possible implementation, the two ends 3 adopt a centrally symmetrical structure.

[0035] In one possible implementation, the outer side of the heat insulation section body 1 is covered with an insulating layer 15.

[0036] In one possible implementation, the insulating layer 15 is an epoxy glass fiber cloth and a KAPTON rewound layer.

[0037] In one possible implementation, the main body 1 of the insulation section adopts a rectangular cross-section structure with a groove, 30mm wide and 8mm thick, with a groove width of 12.5mm and a depth of 3mm. The entire structure is made of high-purity copper at both ends and stainless steel in the middle section. The stainless steel section is used for insulation and has a length ≥200mm. The copper ends are tenoned and brazed to the stainless steel. The copper ends can be bent at an axial angle according to space requirements. The copper ends are appropriately enlarged to a width of 50mm and an extended length ≥50mm. The extended area is used for indium pressing to fix the low-temperature and high-temperature sections, increasing the contact surface to reduce resistance, ensuring a joint resistance <100nΩ.

[0038] Next, high-temperature superconducting tape is laid in the trench, and the superconductivity is fixed by stacking two trenches and brazing. The superconductivity runs through the entire structure.

[0039] Finally, stainless steel strips were stacked and compacted within the trench to compensate for stress-induced delamination and poor connections. Except for the expanded area, all parts were externally wrapped with epoxy glass fiber cloth + KAPTON rewound layer as an insulation layer. Figure 3 As shown.

[0040] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A heat-insulating section structure for a low-current high-temperature superconducting current-carrying lead, characterized in that: The heat insulation section includes a main body (1), which has two symmetrical filling grooves (11) on its front side. Several superconducting strips (12) are stacked at the bottom of the filling grooves (11). Both sides of the superconducting strips (12) are fixed to the filling grooves (11) by brazing structures (13). Several stainless steel strips (14) are laid on the top of the superconducting strips (12). The main body (1) of the heat insulation section includes a central section (2) and two end heads (3) at both ends. The central section (2) is made of stainless steel and the end heads (3) are made of copper. The end (3) and the center section (2) are connected by a tenon and mortise structure and fixed by brazing; The width of the end of the end (3) away from the center section (2) is greater than the width of its inner end, and the end (3) is pre-bent along the length direction according to the space requirements; The two ends (3) adopt a centrally symmetrical structure; The outer side of the heat insulation section (1) is covered with an insulating layer (15).

2. The heat insulation section structure of a high-temperature superconducting current lead with low current flow as described in claim 1, characterized in that: The insulating layer (15) is epoxy glass fiber cloth and KAPTON rewound layer.

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