Magnetic confinement fusion device with low-temperature magnet

Abstract

The utility model relates to the technical field of fusion reactors, in particular to a magnetic confinement fusion device with a low-temperature magnet, which comprises a magnet shell, a magnet coil arranged in the magnet shell and an outer Dewar arranged outside the magnet shell, a fixed supporting structure is arranged between the outer end face of the second end of the magnet shell and the inner end face of the outer Dewar, and one end of the magnet shell is fixed to the outer Dewar. A gap is formed between the first end part and a first outer Dewar fixing block fixed on the outer Dewar in the radial direction, the first end part is connected with a first magnet shell fixing block positioned on the first end part through a first bolt, one end of the first bolt is fixedly connected, and the other end of the first bolt can move freely. When the magnet shell deforms, the magnet shell can adapt to radial and axial expansion / contraction deformation of the first end part, the stress applied to the outer Dewar due to the deformation of the magnet shell caused by the temperature change of the magnet coil is reduced, and the safety of connection between the magnet shell and the outer Dewar is improved.

Description

Technical Field

[0001] This application relates to the technical field of fusion reactors, and particularly to a magnetic confinement fusion device with a cryomagnet. Background Art

[0002] Controlled nuclear fusion energy is an ideal clean energy in the future. Confinement fusion realizes the self-sustained combustion of deuterium and tritium plasmas through the way of low-density long-time combustion and maintains this combustion. Generally, there are three ways to generate nuclear fusion: gravitational confinement, inertial confinement, and magnetic confinement. The main types of magnetic confinement fusion devices are tokamaks, stellarators, and magnetic mirrors. Among them, the tokamak is the easiest to approach the fusion conditions and develops the fastest. Taking the tokamak device as an example, in the prior art, the tokamak device includes a magnet coil, a magnet housing, and an outer cryostat located outside the magnet housing. Among them, the magnet housing and the outer cryostat are fixedly connected, and the positions between them are relatively fixed.

[0003] However, the tokamak device needs cryogenic cooling during operation. The temperature change of the magnet coil will cause the magnet coil and the magnet housing to deform, resulting in a large stress between the magnet housing and the outer cryostat, posing a safety hazard.

[0004] Therefore, how to reduce the safety hazard between the magnet housing and the outer cryostat has become a technical problem to be solved urgently. Summary of the Invention

[0005] This application provides a magnetic confinement fusion device with a cryomagnet to solve the above technical problem of how to reduce the safety hazard between the magnet housing and the outer cryostat.

[0006] Based on this, an embodiment of this application provides a magnetic confinement fusion device with a cryomagnet, including: a magnet housing, a magnet coil disposed inside the magnet housing, and an outer cryostat disposed outside the magnet housing; wherein, a first connection structure is provided between the first end of the magnet housing and the side wall of the outer cryostat, and a fixed support structure is provided between the outer end surface of the second end of the magnet housing and the inner end surface of the outer cryostat; the first connection structure includes a first outer cryostat fixing block disposed on the side wall of the outer cryostat and a first magnet housing fixing block disposed on the first end, wherein, there is a gap between the first outer cryostat fixing block and the first end in the radial direction; the first outer cryostat fixing block and the first magnet housing fixing block are connected by a first bolt, and one of the first outer cryostat fixing block and the first magnet housing fixing block is the fixed end of the first bolt, and the other is the free end of the first bolt.

[0007] In one embodiment, a plurality of first connection blocks are provided on the first outer dewar fixing block, and the number of the first magnet housing fixing blocks is the same as that of the first connection blocks and they correspond to each other one by one; one of the first connection block and the first magnet housing fixing block is provided with a first through hole having freedom in the axial direction; the other of the first connection block and the first magnet housing fixing block is threadedly connected to the first bolt.

[0008] In one embodiment, the first through hole is an oval hole with its length direction being the axial direction.

[0009] In one embodiment, at the corresponding positions of the first outer dewar fixing block and the outer eaves of the first end portion, grooves are respectively formed to form a first limiting groove, and a first limiting block with circumferential constraint is arranged in the first limiting groove.

[0010] In one embodiment, the first limiting block includes an integrally formed first insertion portion and a first hanging portion. The first insertion portion is inserted into the first limiting groove, and the first hanging portion is stuck above the first limiting groove.

[0011] In one embodiment, a second connection structure is arranged between the second end portion and the side wall of the outer dewar; the second connection structure includes a second outer dewar fixing block arranged on the side wall of the outer dewar and a second magnet housing fixing block arranged on the second end portion. Among them, there is a gap between the second outer dewar fixing block and the second end portion in the radial direction; the second outer dewar fixing block and the second magnet housing fixing block are connected by a second bolt, and one of the second outer dewar fixing block and the second magnet housing fixing block is the fixed end of the second bolt, and the other is the free end of the second bolt.

[0012] In one embodiment, a plurality of second connection blocks are provided on the second outer dewar fixing block, and the number of the second magnet housing fixing blocks is the same as that of the second connection blocks and they correspond to each other one by one; one of the second connection block and the second magnet housing fixing block is provided with a second through hole having freedom in the radial direction; the other of the second connection block and the second magnet housing fixing block is threadedly connected to the second bolt.

[0013] In one embodiment, the second through hole is a circular hole.

[0014] In one embodiment, at the corresponding positions of the second outer dewar fixing block and the outer eaves of the second end portion, grooves are respectively formed to form a second limiting groove, and a second limiting block with circumferential constraint is arranged in the second limiting groove.

[0015] In one embodiment, the second limiting block includes an integrally formed second insertion portion and a second hanging portion. The second insertion portion is inserted into the second limiting groove, and the second hanging portion is stuck above the second limiting groove.

[0016] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0017] A fixed support structure is provided between the outer end face of the second end of the magnet housing of the present utility model and the inner end face of the outer dewar, fixing one end of the magnet housing to the outer dewar, so that the second end of the magnet housing is fixed in the axial direction. There is a gap between the first end and the first outer dewar fixing block fixed to the outer dewar in the radial direction, and it is connected to the first magnet housing fixing block located on the first end through a first bolt. One end of the first bolt is fixedly connected, and the other end can move freely. By having a gap between the first end and the first outer dewar fixing block in the radial direction, a margin is reserved for the radial deformation of the first end. One end of the first bolt is fixed and the other end is free. When the magnet housing deforms, it can adapt to the radial and axial expansion / contraction deformation of the first end, that is, perform radial and axial deformation compensation for the first end, reduce the stress exerted on the outer dewar due to the deformation of the magnet housing caused by the temperature change of the magnet coil, and improve the safety of the connection between the magnet housing and the outer dewar.

[0018] Furthermore, there is a gap between the second end of the magnet housing and the second outer dewar fixing block in the radial direction, reserving a margin for the radial deformation of the second end. And the second magnet housing fixing block and the second outer dewar fixing block on the side wall of the outer dewar are connected through a second bolt. One end of the second bolt is fixedly connected, and the other end can move freely. When the magnet housing deforms, it can adapt to the radial expansion / contraction deformation of the second end, that is, perform radial deformation compensation for the second end, reduce the stress exerted on the outer dewar due to the deformation of the magnet housing caused by the temperature change of the magnet coil, and improve the safety of the connection between the magnet housing and the outer dewar.

[0019] Furthermore, corresponding positions between the first outer dewar fixing block and the outer eaves of the first end are respectively provided with grooves to form a first limiting groove, and a circumferentially constrained first limiting block is arranged in the first limiting groove. Through the cooperation of the first limiting groove and the first limiting block, the magnet housing can be circumferentially constrained when a circumferential torsional force is generated during the working state of the magnet coil, restricting the rotation of the magnet housing relative to the outer dewar.

[0020] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0022] Figure 1This is a three-dimensional external structure diagram of a magnetic confinement fusion device with a cryomagnet according to one embodiment of the present invention;

[0023] Figure 2 This is a three-dimensional internal structure diagram of a magnetic confinement fusion device with a cryomagnet according to one embodiment of the present invention;

[0024] Figure 3 This is a three-dimensional diagram of the first connection structure of a magnetic confinement fusion device with a cryomagnet according to one embodiment of the present invention;

[0025] Figure 4 This is a three-dimensional diagram of the second connection structure of a magnetic confinement fusion device with a cryomagnet according to one embodiment of the present invention;

[0026] Figure 5 This is a three-dimensional diagram of the first limiting block and the second limiting block of a magnetic confinement fusion device with a cryomagnet according to one embodiment of the present invention;

[0027] Figure 6 This is a three-dimensional diagram of the first limiting groove and the second limiting groove of a magnetic confinement fusion device with a cryomagnet according to one embodiment of the present invention.

[0028] As shown in the figure:

[0029] 10. Magnet housing; 11. First end; 12. Second end; 20. Magnet coil; 30. Outer dewar; 40. First connection structure; 410. First outer dewar fixing block; 411. First connection block; 420. First magnet housing fixing block; 421. First through hole; 430. First bolt; 440. First limiting groove; 450. First limiting block; 451. First insertion part; 452. First hanging part; 50. Fixed support structure; 60. Second connection structure; 610. Second outer dewar fixing block; 611. Second connection block; 620. Second magnet housing fixing block; 621. Second through hole; 630. Second bolt; 640. Second limiting groove; 650. Second limiting block; 651. Second insertion part; 652. Second hanging part. Detailed implementation manners

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0031] As Figure 1-6 shown, an exemplary magnetically confined fusion device with a cryomagnet is illustrated, including: a magnet housing 10, a magnet coil 20 disposed within the magnet housing 10, and an outer dewar 30 disposed outside the magnet housing 10; wherein, a first connection structure 40 is provided between the first end 11 of the magnet housing 10 and the side wall of the outer dewar 30, and a fixed support structure 50 is provided between the outer end face of the second end 12 of the magnet housing 10 and the inner end face of the outer dewar 30, providing a stable basic support for fixing the magnet housing 10 on the outer dewar 30 through the fixed support structure 50. Among them, an outer dewar support device 31 is further provided at the bottom of the outer dewar.

[0032] In this embodiment, the magnet housing 10 may include a first end 11 and a second end 12, as well as a side wall located between the first end 11 and the second end 12, wherein the first end 11 and the second end 12 are respectively located at the top or bottom of the magnet housing 10. It should be noted that it is not limited that the first end 11 must be located at the top and the second end 12 must be located at the bottom. The case where the first end 11 is located at the bottom and the second end 12 is located at the top is also applicable. The following description will be given by taking the first end 11 located at the top and the second end 12 located at the bottom as an example.

[0033] In one embodiment, the first end 11 and the second end 12 may be circular or polygonal. The circular shape will be taken as an example for description.

[0034] In one embodiment, the outer eaves of the first end 11 and the second end 12 may extend beyond the side wall of the magnet housing 10. The first end 11 is connected to the side wall of the outer dewar 30 through the first connection structure 40.

[0035] Among them, the first connection structure 40 includes a first outer dewar fixing block 410 provided on the side wall of the outer dewar 30 and a first magnet housing fixing block 420 provided on the first end 11. Among them, there is a gap between the first outer dewar fixing block 410 and the first end 11 in the radial direction; the first outer dewar fixing block 410 and the first magnet housing fixing block 420 are connected by a first bolt 430, and one of the first outer dewar fixing block 410 and the first magnet housing fixing block 420 is the fixed end of the first bolt 430, and the other is the free end of the first bolt 430.

[0036] In one embodiment, the gap size of the gap between the first outer dewar fixing block 410 and the first end 11 in the radial direction can be determined according to the maximum radial deformation size when the magnet housing in the magnetic confinement fusion device deforms. Exemplarily, the gap size is greater than the maximum radial deformation size when the magnet housing deforms. In another embodiment, the first end 11 has an outer eaves protruding from the side wall of the magnet housing, and the first outer dewar fixing block 410 can be arranged relative to the outer eaves and has a gap therebetween, and the gap size is greater than the maximum deformation size of the first end 11.

[0037] A fixed support structure 50 is provided between the outer end face of the second end 12 of the magnet housing 10 and the inner end face of the outer dewar 30 to fix one end of the magnet housing 10 on the outer dewar 30, and its axial direction is fixed. There is a gap between the first end 11 and the first outer dewar fixing block 410 fixed on the outer dewar 30 in the radial direction, and they are connected by a first bolt 430 to the first magnet housing fixing block 420 located on the first end 11. One end of the first bolt 430 is fixedly connected, and the other end is free to move. By having a gap between the first end 11 and the first outer dewar fixing block 410 in the radial direction, a margin space is reserved for the radial deformation of the first end 11. One end of the first bolt 430 is fixed and the other end is free. When the magnet housing 10 deforms, it can adapt to the radial and axial expansion / contraction deformation of the first end 11, that is, perform radial and axial deformation compensation for the first end 11, reduce the stress exerted on the outer dewar 30 due to the deformation of the magnet housing 10 caused by the temperature change of the magnet coil 20, and improve the safety of the connection between the magnet housing 10 and the outer dewar 30.

[0038] In one embodiment, a plurality of first connection blocks 410 are provided on the first outer dewar fixing block 410, which can be evenly circumferentially arranged on the side wall of the outer dewar 30. The same number of first magnet housing fixing blocks 420 corresponding to the first connection blocks 410 one by one are also circumferentially arranged on the first end 11. One of the first connection block 410 and the first magnet housing fixing block 420 is provided with a first through hole 421 having freedom in the axial direction. The other of the first connection block 410 and the first magnet housing fixing block 420 is threadedly connected to the first bolt 430. In this embodiment, the number of the first connection blocks 410 and the first magnet housing fixing blocks 420 can be two or more. The first through hole 421 can be provided on the first magnet housing fixing block 420, and the first bolt 430 is threadedly connected to the first connection block 410. In order to further enable the first end 11 to move freely in the axial direction, the first through hole 421 is an oblong hole with the length direction being the axial direction. The first bolt 430 has a space for vertical movement in the first through hole 421 to satisfy that when the magnet coil 20 deforms due to temperature change, the first end 11 can freely float up and down in the axial direction.

[0039] When the magnet coil 20 is working, the magnetic field generated by it will generate a circumferential rotational force on the magnet coil 20. Corresponding positions between the first outer dewar fixing block 410 and the outer eaves of the first end 11 are respectively provided with grooves to form a first limiting groove 440, and a first limiting block 450 with circumferential constraint is arranged in the first limiting groove 440. Among them, the first limiting block 450 includes an integrally formed first insertion part 451 and a first hanging part 452. The first insertion part 451 is inserted into the first limiting groove 440, and the first hanging part 452 is stuck above the first limiting groove 440. Through the cooperation of the first limiting groove 440 and the first limiting block 450, equal and opposite frictional forces can be generated on the magnet housing 10 when the circumferential torsional force is generated in the working state of the magnet coil 20, thereby realizing circumferential constraint and restricting the rotation of the magnet housing 10 relative to the outer dewar 30.

[0040] In one embodiment, a fixed support structure is provided between the outer end face of the second end portion 12 and the inner end face of the outer dewar 30. The second end portion 12 is axially fixed through the fixed support structure. The axial expansion and contraction of the magnet housing 10 can be compensated by the up-and-down floating of the first end portion 11 through the first connection structure 40, and the first end portion 11 can achieve radial expansion and contraction through the free end of the first bolt 430 in the first connection structure 40. When the temperature of the magnet coil 20 changes, the second end portion 12 will also undergo radial expansion and contraction. In order to compensate for the radial expansion and contraction of the second end portion 12, in this embodiment, a second connection structure 60 is provided between the second end portion 12 and the side wall of the outer dewar 30; the second connection structure 60 includes a second outer dewar fixing block 610 provided on the side wall of the outer dewar 30 and a second magnet housing fixing block 620 provided on the second end portion 12. Among them, there is a gap between the second outer dewar fixing block 610 and the second end portion 12 in the radial direction; the second outer dewar fixing block 610 and the second magnet housing fixing block 620 are connected by a second bolt 630, and one of the second outer dewar fixing block 610 and the second magnet housing fixing block 620 is the fixed end of the second bolt 630, and the other is the free end of the second bolt 630.

[0041] In one embodiment, the gap size of the gap between the second outer dewar fixing block 610 and the second end portion 12 in the radial direction can be determined according to the maximum radial deformation size of the magnet housing in the magnet confinement fusion device when it deforms. Exemplarily, the gap size is greater than the maximum radial deformation size of the magnet housing when it deforms.

[0042] In another embodiment, the second end portion 12 has an outer eaves protruding from the side wall of the magnet housing. The second outer dewar fixing block 610 can be arranged relative to the outer eaves and has a gap therebetween, and the gap size is greater than the maximum deformation size of the second end portion 12.

[0043] By leaving a gap between the second end portion 12 of the magnet housing 10 and the second outer dewar fixing block 610 in the radial direction to reserve a margin for the radial deformation of the second end portion 12, and the second magnet housing fixing block 620 and the second outer dewar fixing block 610 on the side wall of the outer dewar 30 are connected by a second bolt 630, one end of the second bolt 630 is fixedly connected and the other end can move freely. When the magnet housing 10 deforms, it can adapt to the radial expansion / contraction deformation of the second end portion 12, that is, compensate for the radial deformation of the second end portion 12, reduce the stress exerted on the outer dewar 30 due to the deformation of the magnet housing 10 caused by the temperature change of the magnet coil 20, and improve the safety of the connection between the magnet housing 10 and the outer dewar 30.

[0044] In one embodiment, a plurality of second connection blocks 611 are provided on the second outer dewar fixing block 610, and the number of the second magnet housing fixing blocks 620 is the same as that of the second connection blocks 611 and they correspond to each other one by one; a second through hole 621 with freedom in the radial direction is formed in one of the second connection block 611 and the second magnet housing fixing block 620; the other of the second connection block 611 and the second magnet housing fixing block 620 is threadedly connected to the second bolt 630.

[0045] In this embodiment, the number of the second connection blocks 611 and the second magnet housing fixing blocks 620 can be two or more. The second through hole 621 can be formed in the second magnet housing fixing block 620. The second bolt 630 is threadedly connected to the second connection block 611. The second through hole 621 is a circular hole. After the bolt passes through the circular hole, it can move freely in the radial direction. To satisfy that when the magnet coil 20 deforms due to temperature change, the second end portion 12 can move freely in the radial direction. In this embodiment, setting the second through hole 621 as a circular hole can further fix the axial movement of the second end portion 12, so as to further provide a stable support basis for the magnet housing 10.

[0046] In order to further limit the rotation of the magnet housing 10, in one embodiment, corresponding positions between the second outer dewar fixing block 610 and the outer eaves of the second end portion 12 are respectively provided with grooves to form a second limiting groove 640, and a second limiting block 650 with circumferential constraint is arranged in the second limiting groove 640. Wherein, the second limiting block 650 includes an integrally formed second insertion portion 651 and a second hanging portion 652. The second insertion portion 651 is inserted into the second limiting groove 640, and the second hanging portion 652 is stuck above the second limiting groove 640. Through the cooperation of the second limiting groove 640 and the second limiting block 650, when the magnet coil 20 generates a circumferential torsional force in the working state, an equal and opposite frictional force can be generated on the magnet housing 10, which forms a cooperation with the first limiting groove 440 and the first limiting block 450 to form a double-end axial constraint, and more stably limits the rotation of the magnet housing 10 relative to the outer dewar 30.

[0047] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0048] In addition, terms such as "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0049] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0050] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

Claims

1. A magnetic confinement fusion device with a cryogenic magnet, characterized in that: Comprising: A magnet housing (10), a magnet coil (20) disposed within the magnet housing (10), and an outer dewar (30) disposed outside the magnet housing (10); wherein, a first connection structure (40) is provided between a first end portion (11) of the magnet housing (10) and a side wall of the outer dewar (30), and a fixed support structure (50) is provided between an outer end surface of a second end portion (12) of the magnet housing (10) and an inner end surface of the outer dewar (30); The first connection structure (40) includes a first outer dewar fixing block (410) provided on the side wall of the outer dewar (30) and a first magnet housing fixing block (420) provided on the first end portion (11), wherein there is a gap between the first outer dewar fixing block (410) and the first end portion (11) in the radial direction; The first outer dewar fixing block (410) and the first magnet housing fixing block (420) are connected by a first bolt (430), and one of the first outer dewar fixing block (410) and the first magnet housing fixing block (420) is a fixed end of the first bolt (430), and the other is a free end of the first bolt (430).

2. The magnetically confined fusion device with a cryogenic magnet according to claim 1, characterized in that: A plurality of first connection blocks (411) are provided on the first outer dewar fixing block (410), and the number of the first magnet housing fixing blocks (420) is the same as that of the first connection blocks (411) and they correspond to each other one by one; One of the first connection block (411) and the first magnet housing fixing block (420) is provided with a first through hole (421) having freedom in the axial direction; the other of the first connection block (411) and the first magnet housing fixing block (420) is threadedly connected to the first bolt (430).

3. The magnetically confined fusion device with a cryogenic magnet according to claim 2, wherein: The first through hole (421) is an oval hole with the length direction being the axial direction.

4. The magnetic confinement fusion device with a cryogenic magnet according to claim 1, characterized in that: Grooves are respectively formed at corresponding positions of the outer eaves of the first outer dewar fixing block (410) and the first end portion (11) to form a first limiting groove (440), and a first limiting block (450) with circumferential constraint is provided in the first limiting groove (440).

5. The magnetically confined fusion device with a cryogenic magnet according to claim 4, characterized in that: The first limiting block (450) includes an integrally formed first insertion portion (451) and a first hanging portion (452), the first insertion portion (451) is inserted into the first limiting groove (440), and the first hanging portion (452) is stuck above the first limiting groove (440).

6. The magnetically confined fusion device with a cryogenic magnet according to claim 1, characterized in that: A second connection structure (60) is provided between the second end portion (12) and the side wall of the outer dewar (30); The second connection structure (60) includes a second outer dewar fixing block (610) provided on the side wall of the outer dewar (30) and a second magnet housing fixing block (620) provided on the second end portion (12), wherein there is a gap between the second outer dewar fixing block (610) and the second end portion (12) in the radial direction; The second outer Dewar fixing block (610) and the second magnet housing fixing block (620) are connected by a second bolt (630), and one of the second outer Dewar fixing block (610) and the second magnet housing fixing block (620) is the fixed end of the second bolt (630), and the other is the free end of the second bolt (630).

7. The magnetically confined fusion device with a cryomagnet according to claim 6, characterized in that: A plurality of second connecting blocks (611) are provided on the second outer Dewar fixing block (610), and the number of the second magnet housing fixing blocks (620) is the same as that of the second connecting blocks (611) and they correspond to each other one by one; One of the second connecting block (611) and the second magnet housing fixing block (620) is provided with a second through hole (621) having freedom in the radial direction; the other of the second connecting block (611) and the second magnet housing fixing block (620) is threadedly connected to the second bolt (630).

8. The magnetically confined fusion device with a cryogenic magnet according to claim 7, wherein: The second through hole (621) is a circular hole.

9. The magnetically confined fusion device with a cryogenic magnet according to claim 6, characterized in that: Grooves are respectively formed at corresponding positions of the second outer Dewar fixing block (610) and the outer eaves of the second end portion (12) to form a second limiting groove (640), and a second limiting block (650) with circumferential constraint is arranged in the second limiting groove (640).

10. The magnetically confined fusion device with a cryomagnet according to claim 9, characterized in that: The second limiting block (650) includes an integrally formed second insertion portion (651) and a second hanging portion (652). The second insertion portion (651) is inserted into the second limiting groove (640), and the second hanging portion (652) is stuck above the second limiting groove (640).

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