Magnet coil and magnet

Abstract

The utility model relates to the technical field of nuclear fusion, and discloses a magnet coil and a magnet, the magnet coil comprises a coil body; the expansionary force restraint layer is arranged on the outer side of the coil body in the circumferential direction; and the solidified structure is filled between the coil turns of the coil body and the outer side of the coil body. The outer side of a coil body is peripherally wrapped by adopting an expansion force restraint layer, and then interturns and the outer side of the coil body are filled with an injection curing structure for reinforcement. When the magnet coil is powered on, the expansionary force restraint layer wrapping the outer side of the coil in the circumferential direction can effectively buffer huge electromagnetic expansionary force generated by the coil body, the burden of applying the expansionary force to the outer layer coil box is greatly reduced, the requirements for the structural strength and thickness of the coil box are reduced, and the coil box only needs to achieve the sealing function; the circumferential resistance and the thickness of the coil box can have a flexible design range according to the requirements of a plasma operation magnetic field and the like, so that the design of the coil box has a larger space.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear fusion technical field, concretely relates to a magnet coil and magnet. BACKGROUND

[0002] In the research of nuclear fusion, tokamak device can confine plasma by magnetic field, and the principle is mainly to generate magnetic field configuration in space by the coil with large current to realize the confinement of plasma, but when the coil is electrified, the radial expansion force of the coil is very large, and often reaches hundreds of thousands or even millions of newtons. In order to maintain the coil in the original state without being stretched and deformed by the expansion force, the coil is usually treated with turn-to-turn insulation, and the coil box is designed to bear the radial expansion force of the coil after electrification. The increase of the expansion force has a higher requirement for the thickness and other structural strength of the coil box. Blindly increasing the thickness of the coil box causes difficulties in the design of the whole device, which is not conducive to the normal operation of the device.

[0003] Therefore, how to reduce the radial expansion force of the coil borne by the coil box becomes a technical problem to be solved. SUMMARY

[0004] Therefore, the utility model provides a magnet coil and magnet to solve the technical problem of how to reduce the radial expansion force of the coil borne by the coil box.

[0005] According to the first aspect, the utility model embodiment provides a magnet coil, which comprises a coil body, an expansion force constraint layer arranged circumferentially outside the coil body, and a solidification structure filled between the coil turns of the coil body and the outside of the coil body.

[0006] In an embodiment, the expansion force constraint layer comprises a high-performance composite insulation material belt circumferentially wrapped outside the coil body.

[0007] In an embodiment, the number of wrapping layers of the high-performance composite insulation material is greater than 10.

[0008] In an embodiment, the expansion force constraint layer comprises a metal ring arranged outside the coil body and an insulation layer arranged between the metal belt and the coil body.

[0009] In an embodiment, the insulation layer comprises a plurality of insulating sheets arranged at intervals.

[0010] In an embodiment, the metal ring comprises a metal belt and a joint fastening device; the joint fastening device comprises a bolt and two bolt mounting structures fixed at both ends of the metal belt; an insulating gasket is arranged between the bolt and the bolt mounting structure and at both ends of the metal belt.

[0011] In an embodiment, the metal ring is an integrally formed metal ring that is interference fit with the coil body through the insulating layer.

[0012] In an embodiment, the coil body comprises a multi-turn coil conductor, and a plurality of layers of inter-turn insulating layers are further wrapped on the coil conductor.

[0013] In an embodiment, the inter-turn insulating layer comprises glass tape and / or polyimide tape.

[0014] According to the first aspect, the embodiments of the utility model provide a kind of magnet, comprising: the magnet coil described in any one of the above first aspect;Coil box, the magnet coil is sealed.

[0015] The present application has at least the following beneficial effects:

[0016] By adopting the expansion force constraint layer for circumferential wrapping on the outer side of the coil body, and then filling and injecting the solidification structure on the inter-turn and the outer side of the coil body for reinforcement. When the magnet coil is energized, the expansion force constraint layer circumferentially wrapped on the outer side of the coil can effectively buffer the huge electromagnetic expansion force generated by the coil body, greatly reducing the burden of the expansion force applied to the outer coil box, reducing the requirement for the structural strength and thickness of the coil box. The coil box only needs to realize the sealing function, and the hoop resistance and thickness of the coil box can be designed flexibly according to the requirements of plasma running magnetic field, so that the coil box has a larger design space. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 is a cross-sectional structure schematic diagram of a magnet coil according to the embodiments of the utility model;

[0019] Figure 2 According to the structure schematic diagram of the fastening structure of the metal strip joint provided by the embodiments of the utility model.

[0020] MARKED FOR EXPLANATION

[0021] 1, coil body; 2, expansion force constraint layer; 21, fastening structure; 211, bolt; 212, bolt mounting structure; 213, insulating gasket. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Typically, insulation of magnet coils involves inter-turn insulation wrapping using multiple layers of glass fiber tape and polyimide tape. However, both polyimide and glass fiber tape have relatively low maximum tensile strength and elastic modulus, limiting the amount of expansion force they can withstand. Therefore, the overall coil design still requires a high level of structural strength for the coil housing supporting the coil. Based on this, this application provides a magnet coil, such as... Figure 1 As shown, the magnet coil includes:

[0024] A coil body 1, an expansion force constraint layer 2, circumferentially wrapping around the outside of the coil body 1; a solidified structure, filling the coil turns of the coil body 1 and the outside of the coil body 1.

[0025] By using an expansion force constraint layer 2 to circumferentially wrap the outer side of the coil body 1, and then reinforcing it by filling and injecting a solidified structure between the turns and on the outer side of the coil body 1, the expansion force constraint layer 2 circumferentially wrapping the outer side of the magnet coil can effectively buffer the huge electromagnetic expansion force generated by the coil body 1 when the magnet coil is energized. This greatly reduces the burden of the expansion force applied to the outer coil box, reducing the requirements for the structural strength and thickness of the coil box. The coil box only needs to achieve the sealing function, and the circumferential resistance and thickness of the coil box can be flexibly designed according to the requirements of the plasma operating magnetic field, etc., giving the coil box a greater design flexibility.

[0026] In this embodiment, the curing structure can be made of epoxy resin. The coil turns and the outer side of the coil body 1 are reinforced by impregnating and filling the epoxy resin, which further improves the mechanical properties of the coil and enhances the coil's ability to withstand coil expansion force in the radial direction.

[0027] In one embodiment, the expansion force constraint layer 2 can be made of a high-performance composite insulation material wrapped around the outside of the coil body 1. In this embodiment, the high-performance composite insulation material can be a composite material with a large maximum tensile strength and elastic modulus, such as ultra-high molecular weight polyethylene or aramid. The larger tensile strength and elastic modulus allow for greater coil expansion force in the radial direction, reducing the expansion force borne by the coil housing, thus providing greater design flexibility for the coil housing.

[0028] In one embodiment, the high-performance composite insulating material has more than 10 layers. In this embodiment, the number of layers is not specifically limited; in practical applications, it can be determined based on the installation space of the coil magnet, the magnitude of the expansion force, and the thickness of each layer of the high-performance composite insulating material.

[0029] In one embodiment, the expansion force constraint layer 2 includes a metal ring disposed on the outside of the coil body 1 and an insulating layer disposed between the metal strip and the coil body 1. The metal ring, such as a stainless steel metal ring, a low-carbon steel metal ring, or an alloy steel metal ring, has a large elastic modulus and maximum tensile strength. Therefore, using a metal ring and an insulating layer in combination as the expansion force constraint layer 2 can withstand a large coil expansion force in the radial direction.

[0030] Some insulating layers, such as G10 and polyimide, typically have low elastic modulus and tensile strength, which may cause the insulating layer to crack during coil expansion. Therefore, the insulating layer can be made of multiple spaced insulating sheets to reserve expansion margin for coil expansion, thereby ensuring the insulation performance of the metal ring.

[0031] In one embodiment, the metal ring can be a one-piece molded metal ring, with the coil body 1 entirely fitted inside the metal ring. The metal ring's installation stability is ensured by an interference fit between the insulating layer and the coil body 1.

[0032] In this embodiment, when the coil body 1 is fitted inside the metal ring, the metal ring can be heated or the coil body 1 can be cooled to a lower temperature. The metal expands and contracts with temperature, thus fitting the coil body 1 inside the metal ring. An insulating layer is then added between the metal ring and the coil body 1. After the temperature recovers, an interference fit is formed between the coil body 1 and the metal ring.

[0033] To minimize circumferential resistance, in this embodiment, a metal strip can be used and fastened to the outside of the coil body 1 using a fastening structure. Insulation material is used between the joints of the metal strip, so the resulting metal ring does not constitute a circumferential conductor, and therefore no circumferential resistance is generated. In this embodiment, see... Figure 2 The fastening structure 21 of the connector shown includes bolts 211 and two bolt mounting structures 212 fixed to both ends of the metal strip. Insulating gaskets 213 are provided between the bolts 211 and the bolt mounting structures 212, and between the two bolt mounting structures 212. In this embodiment, the bolt mounting structures 212 are formed by bending both ends of the metal strip, or they can be welded outwards from both ends of the metal strip. The insulating gaskets 213 isolate the metal strip as a non-circular conductor, thereby reducing the circumferential resistance caused by the metal rings.

[0034] In one embodiment, the coil body 1 includes a multi-turn coil conductor, and a multi-layer inter-turn insulation layer is also wrapped around the coil conductor, the inter-turn insulation layer including glass ribbon and / or polyimide ribbon.

[0035] This application also provides a magnet, including the magnet coil described in the above embodiments; and a coil box to seal the magnet coil. The magnet coil is circumferentially wrapped with an expansion force constraint layer on its outer side, and then reinforced by filling and injecting a solidified structure between the turns and on the outer side of the coil body. When the magnet coil is energized, the expansion force constraint layer circumferentially wrapping the outer side of the coil effectively buffers the huge electromagnetic expansion force generated by the coil body, greatly reducing the burden of the expansion force applied to the outer coil box, reducing the requirements for the structural strength and thickness of the coil box. The coil box only needs to achieve a sealing function to prevent the expansion force constraint layer and gas from escaping. The circumferential resistance and thickness of the coil box can be flexibly designed according to requirements such as the plasma operating magnetic field, giving the coil box design greater flexibility.

[0036] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0037] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A magnetic coil, characterized in that, include: Coil body; An expansion force constraint layer is circumferentially disposed on the outer side of the coil body; A solidified structure is filled between the coil turns of the coil body and on the outside of the coil body.

2. The magnet coil as described in claim 1, characterized in that, The expansion force constraint layer includes a composite insulating material strip that is circumferentially wrapped around the outside of the coil body.

3. The magnet coil as described in claim 2, characterized in that, The composite insulating material has more than 10 wrapping layers.

4. The magnet coil as described in claim 1, characterized in that, The expansion force constraint layer includes a metal ring disposed on the outside of the coil body and an insulating layer disposed between the metal ring and the coil body.

5. The magnet coil as described in claim 4, characterized in that, The insulating layer comprises a plurality of insulating sheets spaced apart.

6. The magnet coil as described in claim 4, characterized in that, The metal ring includes a metal strip and a joint fastening device; The joint fastening device includes bolts and two bolt mounting structures fixed at both ends of the metal strip; An insulating gasket is provided between the bolt and the bolt mounting structure, and between the two bolt mounting structures.

7. The magnet coil as described in claim 4, characterized in that, The metal ring is a one-piece molded metal ring, and the metal ring is interference-fitted with the coil body through the insulating layer.

8. The magnet coil as described in claim 1, characterized in that, The coil body includes a multi-turn coil conductor, and multiple layers of inter-turn insulation are wrapped around the coil conductor.

9. The magnet coil as described in claim 8, characterized in that, The inter-turn insulation layer comprises glass ribbon and / or polyimide ribbon.

10. A magnet, characterized in that, include: The magnet coil as described in any one of claims 1-9; A coil box that seals the magnet coil.

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