Insulation treatment method for fusion reactor superconducting joint special-shaped structure

Abstract

The invention discloses an insulation treatment method for a fusion reactor superconducting joint special-shaped structure, which comprises the following steps of: covering a special-shaped G10 sheath on the outer side of a special-shaped structure area, and compensating the shape of the special-shaped structure area from an irregular shape to a regular linear variable cross-section shape; a cavity between the interior of the G10 sheath and the special-shaped structure area is eliminated by adopting a method of pouring resin glue; a short ribbon type gradual wrapping method is adopted outside the G10 sheath, and wrapping of the insulating material is completed circle by circle according to the designed wrapping rate; after wrapping of the special-shaped area is completed, the regular areas at the two ends are wrapped, and the initial area wrapped by the insulating material of the special-shaped area is pressed below the insulating material of the conventional area. By the adoption of the insulation processing method, the insulation structure and performance which are completely consistent with those of a regular-shaped structure can be achieved, so that the application range of a double-box lap joint type superconducting connector is widened, and the operation stability margin of the whole superconducting magnet is improved.

Description

Technical Field

[0001] The invention relates to the technical field of design and manufacturing of superconducting magnet joints for controlled nuclear fusion devices or other electrophysical devices, and in particular to an insulation treatment method for a special-shaped structure of a superconducting joint of a fusion reactor. Background Art

[0002] Fusion energy is the ultimate form of nuclear energy for human use. As a clean, efficient and sustainable ideal energy source, it has always been a research direction that countries around the world have devoted resources to. At present, the fastest-growing and most promising mainstream solution in the field of nuclear fusion is magnetic confinement controlled nuclear fusion, which uses a "magnetic cage" generated by high-performance superconducting coils to confine fusion materials with a temperature of hundreds of millions of degrees in the reaction area and continuously produce nuclear fusion reactions.

[0003] As the core component of the magnetic confinement fusion reactor, the manufacture of the insulation structure of the superconducting coil (magnet) is a key step to ensure the operation of the superconducting coil. If there are defects in the insulation structure, the superconducting coil will break through the insulation structure when it is energized, causing a short circuit inside the superconducting coil or forming an external discharge channel, thus causing the superconducting coil to fail and become scrapped.

[0004] As the core connection part inside the superconducting coil, the superconducting joint has structural and appearance characteristics that are significantly different from the superconducting coil body. The insulation of the superconducting joint is particularly important. The conventional "continuous winding and overlapping" insulation wrapping method is suitable for structures with round or square cross-sectional profiles, but has poor adaptability to structures with variable cross-sectional profiles or even irregular cross-sectional shapes, which will cause problems such as "falling off" and "wrinkling" of the insulation material or even the inability to wrap. Summary of the invention

[0005] The purpose of the present invention is to provide an insulation treatment method for the special-shaped structure of the superconducting joint of a fusion reactor, aiming to solve the technical problems existing in the above-mentioned prior art. To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows:

[0006] An insulation treatment method for a fusion reactor superconducting joint special-shaped structure, comprising the following steps:

[0007] S1, using a specially shaped G10 sheath to cover the outside of the special-shaped structural area of ​​the superconducting joint, compensating the shape of the special-shaped structural area from irregular to a regular linear variable cross-section shape;

[0008] S2, using the method of pouring resin glue to eliminate the cavity between the G10 sleeve and the special-shaped structure area;

[0009] S3, G10 The outer part of the sheath adopts the "short ribbon" gradual wrapping method, and the short insulating tape is wrapped circle by circle according to the designed overlap rate;

[0010] After the S4 and G10 sheaths are wrapped, long insulating tapes are used to wrap the regular areas of the superconducting joints using the conventional "continuous winding and stacking" insulation wrapping method.

[0011] As a further solution of the present invention: the superconducting joint includes a middle regular area with a uniform and square cross-sectional shape, special-shaped structural areas located at both ends of the middle regular area, and end regular areas with a uniform and square or circular cross-sectional shape located at the ends of the special-shaped structural areas.

[0012] As a further solution of the present invention: Step S1 further comprises: using a sealing filler and an adhesive tape to seal all assembly gaps between the G10 sheath and the superconducting joint.

[0013] As a further solution of the present invention: the method of pouring resin glue in step S2 is: pouring a resin material that cures at room temperature into the cavity between the inner wall of the G10 sleeve and the special-shaped structure area from an injection port opened on the G10 sleeve.

[0014] As a further solution of the present invention, the following steps are also included between step S2 and step S3:

[0015] Two-component metal glue is used to fill the cross-sectional transition area of ​​the G10 sleeve to create a structure with a smooth cross-sectional transition. After the two-component metal glue is cured, it is polished and shaped by sandpaper.

[0016] As a further solution of the present invention: the "short ribbon" type gradual wrapping method described in step S3 is specifically: use a short insulating tape, wrap it around the surface of the G10 sheath in the vertical direction of the hypotenuse of the G10 sheath and cross-stack the two ends of the short insulating tape; then use another short insulating tape to wrap the next circle, and complete the wrapping of all short insulating tapes circle by circle and layer by layer.

[0017] As a further solution of the present invention: the short insulating tape portion wrapped by the "short ribbon" type gradual wrapping method extends to the middle regular area and the end regular area.

[0018] As a further solution of the present invention: in step S4, when the regular area of ​​the superconducting joint is wrapped by the conventional "continuous winding and laminating" insulation wrapping method, the short insulation tape extending to the middle regular area and the end regular area is covered.

[0019] As a further solution of the present invention: the G10 sheath includes two symmetrical half sheaths, and the two half sheaths are fixed to the periphery of the special-shaped structure area by glue.

[0020] Beneficial effects of the present invention:

[0021] The present invention uses a specially shaped G10 sheath to cover the outside of the special-shaped structural area, and compensates the shape of the special-shaped structural area from irregular to regular linear variable cross-section shape; the cavity between the inside of the G10 sheath and the special-shaped structural area is eliminated by the method of pouring resin glue; the outside of the G10 sheath adopts the "short ribbon" type gradual wrapping method to complete the wrapping of the insulating material circle by circle according to the designed overlap rate; after wrapping the special-shaped area, the regular areas at both ends are wrapped, and the starting area of ​​the insulation material wrapping of the special-shaped area is pressed under the insulation material of the regular area. The insulation treatment method described in the present invention can achieve an insulation structure and performance that is completely consistent with the regular shape structure, thereby broadening the application range of the "double box lap joint" superconducting joint and improving the operating stability margin of the entire superconducting magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the structure of the superconducting joint of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the superconducting joint after insulation treatment of the present invention;

[0025] Figure 3 The present invention is a schematic flow chart of an insulation treatment method for a special-shaped structure of a superconducting joint of a fusion reactor.

[0026] In the figure: 1. Regular end area; 2. Special-shaped structure area; 3. Middle regular area; 4. G10 sleeve; 5. Injection riser; 6. Section transition area; 7. Short insulating strip; 8. Long insulating strip. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. Based on the embodiments of 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.

[0028] In the description of the present invention, it should be understood that terms such as "up", "down", "left", "right", "front" and "back" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation. Therefore, they should not be understood as limitations on the present invention.

[0029] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] See also Figure 1-3 As shown, the present invention provides an insulation treatment method for a fusion reactor superconducting joint with a special-shaped structure, please refer to Figure 1 As shown, the superconducting joint includes a middle regular region 3, special-shaped structure regions 2 located at both ends of the middle regular region 3, and an end regular region 1 located at the end of the special-shaped structure region 2. The cross-sectional shape of the middle regular region 3 is consistent and square, the cross-sectional shape of the end regular region 1 is consistent and square or circular, and the cross-sectional shape of the special-shaped structure region 2 is irregular, resulting in the problem of "falling off" and "wrinkling" of the insulating material or even being unable to be wrapped when the special-shaped structure region 2 is wrapped using the conventional "continuous winding and overlapping" insulation wrapping method.

[0031] Therefore, the present invention provides an insulation treatment method for a fusion reactor superconducting joint special-shaped structure, comprising the following steps:

[0032] Use a specially shaped G10 sheath 4 to cover the outside of the superconducting joint special-shaped structure area 2. Preferably, refer to Figure 2 As shown, the G10 sheath 4 includes two symmetrical half sheaths, which are fixed to the outer periphery of the special-shaped structure area 2 by glue, and the shape of the special-shaped structure area 2 is compensated from irregular to regular linear variable cross-sectional shape. The G10 sheath 4 is used to achieve a smooth transition of the cross-sectional shape between the G10 sheath 4 and the adjacent areas at both ends. And the sealing filler and tape are used to seal all the assembly gaps between the G10 sheath 4 and the superconducting joint.

[0033] Afterwards, the resin glue is poured in a method. Specifically, injection ports 5 are respectively opened on the two halves of the jacket, and the resin material that cures at room temperature is poured into the cavity between the inner wall of the G10 jacket 4 and the special-shaped structure area 2 from the injection ports 5 to eliminate the cavity between the G10 jacket 4 and the special-shaped structure area 2. Two-component metal glue (special putty) is used to fill the transition structure in the cross-sectional transition area 6, and the metal glue is polished and reshaped after curing, so that the filled transition structure and the end regular area 1 are smoothly transitioned, avoiding the G10 jacket 4 shape design and manufacturing being too complicated.

[0034] The outer part of the G10 sheath 4 is wrapped with a "short ribbon" gradual wrapping method, and the short insulating tape 7 is wrapped one circle at a time according to the designed overlap rate. Figure 2As shown, a short insulating tape 7 is used to wrap around the surface of the G10 sheath 4 in a direction perpendicular to the hypotenuse of the G10 sheath 4, and the two ends of the short insulating tape 7 are cross-stacked; then another short insulating tape 7 is used to wrap the next circle, and all the short insulating tapes 7 are wrapped circle by circle and layer by layer. The short insulating tape 7 wrapped using the "short ribbon" gradual wrapping method partially extends to the middle regular area 3 and the end regular area 1. After the G10 sheath 4 is wrapped, a long insulating tape 8 is used to wrap the superconducting joint regular area using the conventional "continuous winding and stacking" insulation wrapping method. When the superconducting joint regular area is wrapped using the conventional "continuous winding and stacking" insulation wrapping method, the short insulating tape 7 extending to the middle regular area 3 and the end regular area 1 is covered.

[0035] The above method can solve the problem of wrapping insulating materials on the surface of special-shaped structures. The conventional "continuous winding and overlapping" insulation wrapping method is suitable for structures with circular or square cross-sectional contours, but has poor adaptability to structures with variable cross-sectional profiles or even irregular cross-sectional shapes, and will cause problems such as "falling off" and "wrinkling" of insulating materials or even inability to wrap. The insulation treatment method described in the present invention can achieve an insulation structure and performance that is completely consistent with a regular shape structure, thereby broadening the application range of the "double-box lap joint" superconducting joint and improving the operating stability margin of the entire superconducting magnet.

[0036] The above is a detailed description of the preferred embodiments of the present invention, which cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A method for insulating a special-shaped structure of a superconducting joint of a fusion reactor, characterized in that: The following steps are involved: S1, using a specially shaped G10 sheath (4) to cover the outside of the superconducting joint special-shaped structure region (2), so as to compensate the shape of the special-shaped structure region (2) from irregular to regular linear variable cross-section shape; S2, using a method of injecting resin glue to eliminate the cavity between the G10 sleeve (4) and the special-shaped structure area (2); The S3, G10 sheath (4) is wrapped with a "short ribbon" gradual wrapping method, and the short insulating tape (7) is wrapped one circle at a time according to the designed overlap ratio; After the S4 and G10 sheaths (4) are wrapped, a long insulating tape (8) is used to wrap the regular area of ​​the superconducting joint using a conventional "continuous winding and overlapping" insulation wrapping method.

2. The insulation treatment method for the special-shaped structure of the superconducting joint of a fusion reactor according to claim 1 is characterized in that: The superconducting joint comprises a middle regular region (3) with a uniform cross-sectional shape and a square shape, special-shaped structural regions (2) located at both ends of the middle regular region (3), and an end regular region (1) with a uniform cross-sectional shape and a square or circular shape located at the end of the special-shaped structural region (2).

3. The insulation treatment method for the special-shaped structure of superconducting joints for fusion reactors according to claim 1 is characterized in that: Step S1 also includes: using a sealing filler and an adhesive tape to seal all assembly gaps between the G10 sheath (4) and the superconducting joint.

4. The insulation treatment method for the special-shaped structure of superconducting joints for fusion reactors according to claim 1 is characterized in that: The method for pouring the resin glue in step S2 is: pouring a resin material that cures at room temperature into the cavity between the inner wall of the G10 sleeve (4) and the special-shaped structure area (2) from the injection port (5) opened on the G10 sleeve (4).

5. The insulation treatment method for the special-shaped structure of superconducting joints for fusion reactors according to claim 1 is characterized in that: The following steps are also included between step S2 and step S3: A two-component metal glue is used to fill the cross-sectional transition area (6) of the G10 sleeve (4) to form a structure with a smooth cross-sectional transition. After the two-component metal glue is cured, the structure is polished and shaped by sandpaper.

6. The insulation treatment method for the special-shaped structure of superconducting joints for fusion reactors according to claim 2 is characterized in that: The "short ribbon" type gradual wrapping method described in step S3 is specifically as follows: using a short insulating tape (7) to wrap around the surface of the G10 sheath (4) in a direction perpendicular to the oblique side of the G10 sheath (4) and cross-stack the two ends of the short insulating tape (7); then using another short insulating tape (7) to wrap the next circle, and completing the wrapping of all the short insulating tapes (7) circle by circle and layer by layer.

7. The insulation treatment method for the special-shaped structure of superconducting joints for fusion reactors according to claim 6 is characterized by: The short insulating tape (7) wrapped by the "short ribbon" type gradual wrapping method partially extends to the middle regular area (3) and the end regular area (1).

8. The insulation treatment method for the special-shaped structure of superconducting joints for fusion reactors according to claim 7 is characterized in that: In step S4, when the superconducting joint regular region is wrapped by the conventional "continuous winding and lamination" insulation wrapping method, the short insulation tape (7) extending to the middle regular region (3) and the end regular region (1) is covered.

9. The insulation treatment method for the special-shaped structure of superconducting joints for fusion reactors according to claim 1 is characterized by: The G10 sheath (4) comprises two symmetrical half sheaths, and the two half sheaths are fixed to the periphery of the special-shaped structure area (2) by glue.

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