Superconducting coil, tokamak device applying same and superconducting coil stacking process

Abstract

The invention discloses a superconducting coil, a Tokamak device applying the superconducting coil and a superconducting coil stacking process, the superconducting coil comprises a plurality of layers of sub-unit coil stacks, each layer of sub-unit coil is provided with two coil joints, and the joints of the adjacent layers are connected in a staggered manner to form a spirally rising conduction structure. The stacking process takes a leveling support platform as a reference, and coil posture adjustment is realized through a replaceable clamp: a first clamp is used for fixing a coil and detecting a contour and a joint position, and a second clamp is used for replacement after the coil is qualified; during hoisting, positioning is carried out through a characteristic line alignment technology, the profile is adjusted through a shape maintaining tool or the angle is finely adjusted through a circumferential adjusting device, and accurate alignment between layers is ensured; the circumferential adjusting device corrects the angle deviation through the telescopic column. According to the scheme, through multi-stage precision control, assembly precision control over stacking of the superconducting coils is achieved, the problems of interlayer dislocation and poor conduction of the large-size coils are solved, and the magnetic field uniformity and operation stability of the Tokamak device are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear fusion superconducting coils, and particularly relates to a superconducting coil, a tokamak device applying the superconducting coil, and a superconducting coil stacking process. Background Art

[0002] The poloidal field coil (PF coil) in a tokamak device is an important component for controlling the plasma configuration, stability, and current drive. The magnetic field generated by it is perpendicular to the toroidal direction of the plasma, forming a poloidal magnetic field, which acts together with the toroidal magnetic field generated by the toroidal field coil to make the magnetic field lines present a helical structure, thereby confining the high-temperature plasma.

[0003] In the related art, due to space limitations, the superconducting coil cannot be wound and processed without limit. Therefore, multiple layers of sub-unit coils need to be stacked to form the final poloidal field coil. The stacked superconducting coil needs to enter the subsequent vacuum pressure impregnation process (VPI) for integral resin injection. Therefore, it is necessary to ensure that the stacking accuracy meets the requirements of high standards and high precision. However, due to the large size (the diameter can reach more than ten meters) and large weight (the weight can reach dozens of tons or even hundreds of tons) of the superconducting coil, it poses a great challenge to the requirement of the superconducting coil accuracy. Summary of the Invention

[0004] The purpose of the present invention is to propose a superconducting coil, a tokamak device applying the superconducting coil, and a superconducting coil stacking process to solve the problems in the prior art.

[0005] To this end, the present invention provides a superconducting coil, a tokamak device applying the superconducting coil, and a superconducting coil stacking process, including: Design a superconducting coil, including: multiple layers of sub-unit coils; Coil joints, each of the sub-unit coils is provided with two coil joints, and the coil joints of adjacent two layers of sub-unit coils are connected in a staggered manner, so that the current forms a helically rising conduction structure along the stacking direction.

[0006] As a preferred technical solution, at least one layer of fiberglass cloth is laid flat on the surface of the sub-unit coil.

[0007] Design a tokamak device, including the superconducting coil according to any one of the above.

[0008] Design a stacking process for the superconducting coil according to any one of the above, including: Level the support platform and mark the characteristic lines on the support platform; A plurality of first jigs are fixed along the circumference of the sub-unit coil, and the sub-unit coil is lifted by a hoist and kept moving horizontally and placed on the support platform; Measure the profile of the sub-unit coil and the position of the coil joint. If the preset requirements are met, proceed to the next step; otherwise, perform orthopedic correction until the preset requirements are satisfied. Replace all the first fixtures outside the sub-unit coil with second fixtures, and connect the sling to the second fixtures. Use the sling to lift the second fixture and the sub-unit coil by a preset distance, and compare the feature lines on the sub-unit coil with the feature lines on the support platform. If there is a deviation, adjust the profile of the sub-unit coil with a conformal tool or adjust the angle of the sub-unit coil with a circumferential tool until the feature lines of the sub-unit coil are aligned with the feature lines of the support platform, and then lower the coil to complete the stacking of the sub-unit coil. Repeat the above steps until all sub-unit coils are stacked.

[0009] As a preferred technical solution, the step of circumferentially adjusting the sub-unit coil includes: After the sub-unit coil is lifted, the adjusting column provided on the support platform abuts against the main frame of the second fixture, and by controlling the extending length of the adjusting column, the circumferential rotation angle of the sub-unit coil is adjusted.

[0010] As a preferred technical solution, after the hoisting of each layer of the sub-unit coil is completed, remove the second fixture. The second fixture includes a fixture main body that clamps the side surface and the upper surface of the sub-unit coil. A steel belt is disposed around the bottom of the fixture main body, and the steel belt surrounds the lower surface of the sub-unit coil. When removing the second fixture, cut the steel belt and pull out the steel belt.

[0011] As a preferred technical solution, after removing the second fixture, use a measuring tool to obtain the actual height of the superconducting coil, then lay the fiberglass cloth, and press the sub-unit coil to a preset height by using a pressing tool.

[0012] As a preferred technical solution, the step of laying the fiberglass cloth includes: Clean the surface of the sub-unit coil, lay at least one layer of fiberglass cloth until the thickness of the laid fiberglass cloth is the same as the preset height requirement.

[0013] As a preferred technical solution, the step of adjusting the profile of the sub-unit coil with the conformal tool includes: Determine the position where the profile of the sub-unit coil deviates, and press the quick clamp in the conformal tool at this position, so that the pressing block at the end of the quick clamp squeezes the side surface of the sub-unit coil to adjust the profile.

[0014] As a preferred technical solution, a plurality of guiding tools are arranged along the circumferential outer edge of the support platform, and the guiding tools are used to limit the falling position of the sub-unit coil.

[0015] Beneficial effects: 1. The present invention provides a superconducting coil, a tokamak device applying the superconducting coil, and a superconducting coil stacking process. By leveling the support platform horizontally to establish a reference, using a replaceable fixture for the sub-unit coil to achieve coil attitude conversion, and combining profile detection and feature line alignment technology to ensure the positioning accuracy of the sub-unit coils between layers. Further, a circumferential adjustment device is used to finely adjust the coil angle through a telescopic adjustment column, and the second fixture realizes dynamic height compensation through a bottom detachable steel belt and through pressing compensation and fiberglass cloth filling, so as to achieve the assembly accuracy control during the multi-layer stacking of the superconducting coil. Description of the drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the superconducting coil provided by the present invention.

[0018] Figure 2 It is a process flow diagram of the stacking process provided by the present invention.

[0019] Figure 3 It is a schematic structural diagram of the shape-preserving tool and the pressing tool in the stacking process provided by the present invention. Detailed implementation manners

[0020] The content of the present invention can be more easily understood by referring to the following detailed description of the preferred implementation methods of the present invention and the included embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. When there is a contradiction, the definition in this specification shall prevail.

[0021] The present invention provides a superconducting coil, a tokamak device applying the superconducting coil, and a superconducting coil stacking process, which solve the problem that in the prior art, when stacking sub-unit coils of a large-size and heavy superconducting coil, the sub-unit coils between adjacent layers cannot be accurately aligned, affecting the accuracy of the superconducting coil stacking and also affecting the subsequent VPI process.

[0022] The technical concept of the present invention is: firstly, a reference is established through a horizontal leveling support platform, and a replaceable clamp of a sub-unit coil is used to realize the coil posture conversion, and the positioning accuracy of the interlayer sub-unit coil is guaranteed by combining the contour detection and characteristic line alignment technology. Further, a circumferential adjustment device is used to fine-tune the coil angle through a telescopic adjustment column, and the second clamp realizes dynamic height compensation through a detachable steel belt at the bottom and through compression compensation and glass cloth filling, forming a closed-loop control system of "hoisting-detection-adjustment-tightening", which can realize the assembly accuracy control of superconducting coils when multiple layers are stacked.

[0023] like Figure 1 As shown, a superconducting coil 100 includes multiple layers of sub-unit coils 110, each layer of sub-unit coils 110 is a pancake-shaped structure formed by winding, and a joint is provided at each end of each sub-unit coil 110. It can be understood that the sub-unit coils 110 are wound by a linear superconducting conductor, so the sub-unit coils 110 have two ends. In order to ensure that two adjacent layers of sub-unit coils 110 can be connected, coil joints 120 are required to be provided at both ends of the single-layer sub-unit coil 110. The coil joints 120 of two adjacent layers of sub-unit coils 110 are staggered and connected, so that the current can form a spirally ascending conductive structure along the stacking direction.

[0024] The present application also provides a tokamak device, which includes the above-mentioned superconducting coil 100, wherein there is more than one superconducting coil 100, and multiple ones can be provided as needed to meet actual needs.

[0025] refer to Figure 2 , a stacking process of a superconducting coil 100, comprising: The support platform 300 is leveled, and characteristic lines are marked on the support platform 300. Before leveling the support platform 300, the support platform 300 needs to be installed. In some embodiments, the support platform 300 includes a plurality of lifting platforms, and the plurality of lifting platforms form a circle to support the superconducting coil 100. At the same time, the entire support platform 300 is equipped with a wireless touch screen, and the lifting action of any lifting platform can be controlled by the wireless touch screen.

[0026] Optionally, each lifting platform includes a support frame, a servo lift is installed at the bottom of the support frame, and a pad is provided on the surface of the support frame, wherein the support frame and the servo lift are connected by a screw rod to prevent the coil from having a large lateral force during the correction process, thereby causing damage to the servo lift. In some embodiments, by adjusting the installation position of the lift screw rod, the stacking requirements of superconducting coils 100 of different sizes can be adapted.

[0027] For the leveling of the support platform 300, it can be determined by a laser tracker. Feature lines are marked on the support platform 300. Specifically, visible longitudinal lines that are easy to observe can be marked at visible positions on the side of the support frame, such as red feature lines.

[0028] All in all, the lifting platform provides a stacking working area for the superconducting coil 100. The liftable design provides a reference plane for stacking, provides a basis for the control of tolerances in subsequent dimensional measurements, and can also meet the usage requirements for disassembling the fixture needed for subsequent insulation wrapping.

[0029] A plurality of first fixtures 200 are circumferentially fixed to the subunit coil 110. The subunit coil 110 is horizontally lifted by a lifting tool and accurately positioned on the support platform 300 through a guiding mechanism. Specifically, as Figure 1 shown, the first fixture 200 includes four clamping plates on the top, bottom, left, and right, and the clamping plates can be fixed by bolts. The gap between the upper and lower clamping plates can be adjusted according to the number of layers of the subunit coil 110 to meet the requirements. For example, when the first fixture 200 clamps a single subunit coil 110 as described above, the gap between the upper and lower clamping plates is adjusted to match the thickness of a single-layer coil. Before hoisting, the steel wire rope of the lifting tool is connected to the first fixture 200, and the entire subunit coil 110 is kept horizontal through the turnbuckle on the lifting tool and hoisted to above the stacking platform, that is, the support platform 300, and a guiding mechanism is arranged outside the circumference of the support platform 300. The subunit coil 110 is slowly lowered within the range of the guiding structure until it lands on the support platform 300 or on the upper surfaces of a plurality of pads on the upper surface of the lower-layer subunit coil 110. Preferably, the pads are G10 pads.

[0030] Optionally, the guiding mechanism is installed about 2 mm away from the outer contour of the coil, that is, a 2-mm gap is reserved between the guiding mechanism and the coil to avoid frictional damage.

[0031] Measure the profile of the subunit coil 110 and the position of the coil joint 120. If the preset requirements are met, proceed to the next step; otherwise, perform orthopedic correction until the preset requirements are met. Specifically, the profile orthopedic correction of the subunit coil 110 can be carried out through a Figure 3 profile-preserving tool 400 as shown. The profile-preserving tool 400 consists of a base 410, a quick clamp 460, and a pressing block 420. By tightening the quick clamp 460, the pressing block 420 applies pressure to the outer contour of the subunit coil 110 to adjust its profile and achieve orthopedic correction. For the orthopedic correction of the coil joint 120, it can be carried out along the circumference of the coil joint 120 by a tool.

[0032] Optionally, the briquette 420 is a G10 block. G10 is a composite material made by laminating fiberglass cloth and epoxy resin under high temperature and high pressure, which has the advantages of high strength, insulation, heat resistance, corrosion resistance, lightness, and machinability.

[0033] Replace all the plurality of first clamps 200 outside the subunit coil 110 with second clamps, and connect the lifting tool to the second clamps. The first clamp 200 is a traditional clamp. If the traditional clamp is used to lift the subunit coil 110 and place it on the upper surface of the next-layer subunit coil 110, it will cause the clamp to be unable to be removed, affecting the normal stacking of the superconducting coil 100. By replacing the first clamp 200 with a second clamp, the second clamp includes a main frame, and a steel belt is disposed around the lower part of the main frame. During hoisting, the steel belt surrounds the lifted subunit coil 110. After the stacking is completed, the steel belt is cut and withdrawn from one end, effectively solving the problem that the traditional clamp cannot be removed after the stacking is completed and cannot meet the stacking requirements.

[0034] Use the lifting tool to lift the second clamp and the subunit coil 110 by a preset distance, and compare the feature lines on the subunit coil 110 with the feature lines on the support platform 300. If there is a deviation, adjust the contour of the subunit coil 110 through the conformal tool 400 or adjust the angle of the subunit coil 110 through the circumferential tool until the feature lines of the subunit coil 110 are aligned with the feature lines of the support platform 300, and then lower the coil to complete the stacking of the subunit coil 110; Among them, the step of circumferentially adjusting the subunit coil 110 includes, after the subunit coil 110 is lifted, the adjusting column provided on the support platform 300 abuts against the main frame of the second clamp, and by controlling the extension length of the adjusting column, the circumferential rotation angle of the subunit coil 110 is adjusted so that the feature lines on the subunit coil 110 are aligned with the support lines on the next-layer sub-coil unit or the support platform 300. Specifically, a laser tracker can be used to determine whether they are aligned.

[0035] Repeat the above steps until the stacking of all the subunit coils 110 is completed.

[0036] Optionally, after the second fixture is removed, a measuring tool is used to obtain the actual height of the superconducting coil 100, and then the fiberglass cloth is laid, and the sub-unit coil 110 is pressed to a preset height by using a pressing tool. It should be noted that the above is the case where the measured height is greater than or equal to the preset height. In another case, when the measured height is less than the preset height, the fiberglass cloth can be directly laid without using a pressing tool for pressing. The steps of laying the fiberglass cloth for each layer of the sub-unit coil 110 include: cleaning the surface of the sub-unit coil 110, laying at least one layer of fiberglass cloth flat until the thickness of the laid fiberglass cloth is the same as the preset height requirement. Due to the self-weight of the sub-unit coil 110, after the coils are stacked layer by layer, the overall height of the coils is less than the preset height. However, since the subsequent VPI molds are all manufactured in advance according to the preset dimensions, there will be a large gap between the sub-unit coil 110 and the VPI mold. During the injection molding process, this gap will form a pure glue area, resulting in poor mechanical properties of the superconducting coil 100 after VPI, and further affecting the superconducting performance of the entire superconducting coil 100, and even causing huge losses.

[0037] By laying the fiberglass cloth, on the one hand, it can play an insulating role, and on the other hand, it can also compensate for the height difference between the preset height and the actual height, avoid the generation of a pure glue area, and improve the superconducting performance of the superconducting coil 100.

[0038] As Figure 3 shown, optionally, the pressing tool is arranged above the shape-preserving tool 400. The pressing tool includes a cross plate 440 horizontally placed above the coil. A threaded hole is opened at the center of the cross plate 440, and a lead screw is threadedly connected in the threaded hole. The lower end of the threaded lead screw 430 is connected with a pressing plate 450. The height of the coil can be limited and shaped by the pressing tool, and at the same time, it can assist in judging whether the laying thickness of the fiberglass cloth between the sub-unit coils 110 is reasonable. Optionally, a tightening head is reserved at the upper end of the threaded lead screw 430, and the pressing plate 450 can be quickly lowered by a screw gun.

[0039] Optionally, the pressing plate 450 is a G10 plate. G10 is a composite material made of fiberglass cloth and epoxy resin by high-temperature and high-pressure lamination. It has the advantages of high strength, insulation, heat resistance, corrosion resistance, lightness, and workability.

[0040] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A superconducting coil, characterized in that, Comprising: Multi-layer sub-unit coils; Coil joints, two coil joints are provided for each of the sub-unit coils, and the coil joints of adjacent two layers of sub-unit coils are connected in a staggered manner, so that the current forms a helically rising conduction structure along the stacking direction.

2. The superconducting coil according to claim 1, wherein, At least one layer of fiberglass cloth is laid flat on the surface of the sub-unit coil.

3. A tokamak device, characterized in that, Comprising the superconducting coil according to any one of claims 1-2.

4. A stacking process for a superconducting coil according to any one of claims 1-2, characterized in that, Comprising: A leveling support platform, and characteristic lines are marked on the support platform; A plurality of first clamps are fixed to the sub-unit coil along the circumferential direction, and the sub-unit coil is lifted by a lifting tool and kept moving horizontally and placed on the support platform; Measure the profile of the sub-unit coil and the position of the coil joint. If the preset requirements are met, proceed to the next step; otherwise, perform orthopedic correction until the preset requirements are met; Replace all the plurality of first clamps outside the sub-unit coil with second clamps, and connect the lifting tool to the second clamps; Use the lifting tool to lift the second clamp and the sub-unit coil by a preset distance, and compare the characteristic line on the sub-unit coil with the characteristic line on the support platform. If there is a deviation, adjust the profile of the sub-unit coil through a conformal tool or adjust the angle of the sub-unit coil through a circumferential tool until the characteristic line of the sub-unit coil is aligned with the characteristic line of the support platform, and then lower the coil to complete the stacking of the sub-unit coil; Repeat the above steps until all the sub-unit coils are stacked.

5. The stacking process of the superconducting coil according to claim 4, characterized in that, The step of circumferentially adjusting the sub-unit coil includes: After the sub-unit coil is lifted, the adjusting column provided on the support platform abuts against the main frame of the second clamp, and by controlling the extending length of the adjusting column, the circumferential rotation angle of the sub-unit coil is adjusted.

6. The stacking process of the superconducting coil according to claim 4, wherein After the hoisting of each layer of the sub-unit coil is completed, remove the second clamp; Wherein the second clamp includes a clamp body clamped to the side surface and the upper surface of the sub-unit coil, a steel belt is disposed around the bottom of the clamp body, the steel belt surrounds the lower surface of the sub-unit coil, and when removing the second clamp, cut the steel belt and extract the steel belt.

7. The stacking process of the superconducting coil according to claim 6, characterized in that, After removing the second clamp, use a measuring tool to obtain the actual height of the superconducting coil, then lay the fiberglass cloth, and press the sub-unit coil to a preset height by using a pressing tool.

8. The stacking process of the superconducting coil according to claim 7, characterized in that, The step of laying the fiberglass cloth includes: Clean the surface of the sub-unit coil, lay at least one layer of fiberglass cloth flat until the thickness of the laid fiberglass cloth is the same as the preset height requirement.

9. The stacking process of the superconducting coil according to claim 4, characterized in that, The step of adjusting the profile of the sub-unit coil through the conformal tool includes: Determine the position where the profile of the sub-unit coil deviates, and press the quick clamp in the conformal tool at this position, so that the pressing block at the end of the quick clamp squeezes the side surface of the sub-unit coil to adjust the profile.

10. The stacking process of the superconducting coil according to claim 4, characterized in that, A plurality of guiding tools are arranged along the circumferential outer edge of the support platform, and the guiding tools are used to limit the falling position of the sub-unit coil.

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