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

Abstract

The invention discloses a small-through-flow high-temperature superconducting current lead heat insulation section structure which comprises a heat insulation section body, two filling grooves are symmetrically formed in the front face of the heat insulation section body, a plurality of superconducting strips are stacked at the bottoms of the filling grooves, the two sides of the superconducting strips are fixed to the filling grooves through brazing structures, and a plurality of stainless steel strips are laid on the tops of the superconducting strips. The method is suitable for the technical field of superconducting magnets, a stainless steel center section and two copper ends are designed, the ends are subjected to size expansion treatment, meanwhile, superconducting strips are stacked, laid, brazed and fixed in a filling groove, and stainless steel strips are stacked and laid on the top to compact superconducting so as to cope with delamination virtual connection caused by stress; and continuous through-flow and temperature isolation of high and low temperature areas are ensured, heat leakage of different temperature areas is reduced, and the practicability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of superconducting magnets, in particular to a small through-current high-temperature superconducting current lead insulation section structure. Background Art

[0002] Superconducting magnets are an important component of high-temperature superconducting tokamaks. Superconducting magnets need to operate at low temperatures and have two current leads, positive and negative, for connecting to the power supply. The current leads need to be cooled to ensure that the magnets operate at operating temperature. The current leads have a temperature gradient from low temperature to room temperature, so a structure is needed to ensure the continuity of the current flow and to ensure the temperature isolation of the high and low temperature zones, minimizing heat leakage between different temperature zones. However, there is no similar thermal insulation structure in the existing technology. Therefore, it is urgent to design a high-temperature superconducting current lead insulation section structure with a small current flow to ensure the continuity of the current flow and to ensure the temperature isolation of the high and low temperature zones. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a high-temperature superconducting current lead insulation section structure with small through-current.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A small-current high-temperature superconducting current lead insulation section structure includes an insulation section body, two filling slots are symmetrically opened on the front of the insulation section body, a plurality of superconducting tapes are stacked at the bottom of the filling slots, both sides of the superconducting tapes are fixed to the filling slots by a brazing structure, and a plurality of stainless steel tapes are laid on the top of the superconducting tapes.

[0005] Preferably, the main body of the heat insulation section includes a central section and end caps at both ends, the central section is made of stainless steel, and the end caps are made of copper.

[0006] Preferably, the end head and the central section are connected by a mortise and tenon structure and fixed by brazing.

[0007] Preferably, the width of the end of the end away from the central section is greater than the width of the inner end thereof, and the end is pre-bent at an angle along the length direction according to space requirements.

[0008] Preferably, the two end heads adopt a centrally symmetrical structure.

[0009] Preferably, the outer side of the heat insulation section body is covered with an insulation layer.

[0010] Preferably, the insulating layer is epoxy glass cloth and KAPTON winding layer.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: In the present invention, a stainless steel center section and two copper end heads are designed, the end heads are expanded, and at the same time, they are stacked and laid in a filling groove and brazed and fixed. The top is stacked with stainless steel strips to compact the superconductor to cope with delamination and virtual connection caused by stress, thereby ensuring continuous flow and temperature isolation of high and low temperature zones, reducing heat leakage in different temperature zones, and having strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Is a schematic diagram of the overall structure of the present invention; Figure 2 Is a sectional view of the main body of the thermal insulation section of the present invention; Figure 3 It is a cross-sectional view of the assembly structure of the present invention.

[0013] Figure numerals: 1. Insulation section body; 11. Filling groove; 12. Superconducting tape; 13. Brazing structure; 14. Stainless steel tape; 15. Insulation layer; 2. Center section; 3. End. DETAILED DESCRIPTION

[0014] The specific embodiments of the present invention are described in detail below.

[0015] The "ranges" disclosed herein are defined in the form of lower and upper limits. A given range is defined by selecting a lower limit and an upper limit, and the selected lower and upper limits define the boundaries of the particular range. Ranges defined in this manner can be inclusive or exclusive and can be combined arbitrarily, i.e., any lower limit can be combined with any upper limit to form a range. For example, if a range of 10 to 50 is listed for a particular parameter, it is understood that ranges of 10 to 40 and 20 to 50 are also contemplated. Furthermore, if the minimum range values ​​listed are 1 and 2, and if the maximum range values ​​listed are 3, 4, and 5, then the following ranges are all contemplated: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5. In this application, unless otherwise specified, the numerical range "a to b" is an abbreviation for any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0 to 5" means that all real numbers between "0 to 5" are listed herein, and "0 to 5" is simply an abbreviation for these numerical combinations.

[0016] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0017] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0018] Unless otherwise specified, all steps of the present 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 may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), indicating that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0019] Unless otherwise specified, the terms "include" and "comprising" used in this application may be open-ended or closed-ended. For example, "include" and "comprising" may mean that other components not listed may also be included or that only the listed components are included.

[0020] Unless otherwise specified, the reaction is carried out at room temperature and pressure.

[0021] Unless otherwise specified, all parts or percentages are by weight.

[0022] In the present invention, all substances used are known substances and can be purchased or synthesized by known methods.

[0023] In the present invention, the devices or equipment used are all conventional devices or equipment known in the art and are commercially available.

[0024] The following examples further illustrate a specific embodiment of a small-current high-temperature superconducting current lead insulation section structure of the present invention. The small-current high-temperature superconducting current lead insulation section structure of the present invention is not limited to the description of the following examples.

[0025] Example 1: A small through-current high-temperature superconducting current lead insulation section structure, such as Figure 1-3 As shown, it includes an insulation section body 1, and two filling grooves 11 are symmetrically opened on the front of the insulation section body 1. A plurality of superconducting tapes 12 are stacked at the bottom of the filling grooves 11. Both sides of the superconducting tapes 12 are fixed to the filling grooves 11 by brazing structures 13. A plurality of stainless steel tapes 14 are laid on the top of the superconducting tapes 12.

[0026] In a possible embodiment, the insulation section body 1 includes a central section 2 and end heads 3 at both ends. The central section 2 is made of stainless steel, and the end heads 3 are made of copper.

[0027] In a possible embodiment, the end head 3 and the central section 2 are connected by a mortise and tenon structure and fixed by brazing.

[0028] In a possible embodiment, the width of the end of the end head 3 away from the central section 2 is greater than the width of the inner end thereof, and the end head 3 is pre-bent at an angle along the length direction according to space requirements.

[0029] In a possible implementation, the two ends 3 adopt a centrally symmetrical structure.

[0030] In a possible embodiment, the outer side of the thermal insulation section body 1 is covered with an insulation layer 15 .

[0031] In a possible implementation manner, the insulating layer 15 is an epoxy glass cloth and a KAPTON winding layer.

[0032] In one possible embodiment, the main body 1 of the heat-insulating section adopts a rectangular cross-section structure with a groove, with a width of 30 mm and a thickness of 8 mm, and a groove width of 12.5 mm. It is 3 mm deep. The entire structure is made of high-purity copper at both ends and stainless steel in the middle. The stainless steel section is used for heat insulation and has a length of ≥200 mm. The copper end and the stainless steel are mortised and brazed. The copper end can be bent axially according to space requirements. The width of the copper end is appropriately expanded to 50 mm, and the expanded length is ≥50 mm. The expanded area is used for indium pressing and fixing with the low-temperature section and the high-temperature section, increasing the contact surface to reduce resistance, and ensuring that the joint resistance is less than 100 nΩ.

[0033] Next, high-temperature superconducting tapes are laid in the slots, and the superconductors are fixed by stacking and brazing the double slots. The superconductors run through the entire structural component.

[0034] Finally, the slot is filled with stainless steel tape to compact the superconductor to prevent delamination and joints caused by stress. All parts except the expanded area are wrapped with epoxy glass cloth + KAPTON winding layer as insulation layer, such as Figure 3 shown.

[0035] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A low-current high-temperature superconducting current lead insulation section structure, characterized by: The invention comprises a heat-insulating section body (1), wherein two filling slots (11) are symmetrically provided on the front of the heat-insulating section body (1), a plurality of superconducting tapes (12) are stacked at the bottom of the filling slots (11), both sides of the superconducting tapes (12) are fixed to the filling slots (11) by means of a brazing structure (13), and a plurality of stainless steel tapes (14) are laid on the top of the superconducting tapes (12).

2. The low-current high-temperature superconducting current lead insulation section structure according to claim 1, characterized in that: The heat-insulating section body (1) comprises a central section (2) and end heads (3) at both ends; the central section (2) is made of stainless steel, and the end heads (3) are made of copper.

3. The low-current high-temperature superconducting current lead insulation section structure according to claim 2, characterized in that: The end head (3) and the central section (2) are connected by a mortise and tenon structure and fixed by brazing.

4. The low-current high-temperature superconducting current lead insulation section structure according to claim 2, characterized in that: The width of one end of the end head (3) away from the central section (2) is greater than the width of the inner end thereof, and the end head (3) is pre-bent at an angle along the length direction according to space requirements.

5. The low-current high-temperature superconducting current lead insulation section structure according to claim 3, characterized in that: The two end heads (3) adopt a centrally symmetrical structure.

6. The low-current high-temperature superconducting current lead insulation section structure according to claim 1, characterized in that: The outer side of the heat insulation section body (1) is covered with an insulation layer (15).

7. The low-current high-temperature superconducting current lead insulation section structure according to claim 1, characterized in that: The insulating layer (15) is an epoxy glass cloth and a KAPTON winding layer.

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