Heat insulation device for cold shield of Tokamak device

Abstract

The utility model discloses a heat insulation device for a cold shield of a Tokamak device, which belongs to the technical field of nuclear fusion engineering and comprises a low-temperature side heat insulation device and a high-temperature side heat insulation device, each of the low-temperature side heat insulation device and the high-temperature side heat insulation device comprises a multi-layer heat insulation layer, a connecting component and a T-shaped fixing block, and the connecting component comprises a flanging structure and a connecting bolt; the multiple heat insulation layers are divided into a plurality of blocks in the annular direction of the Tokamak device cold screen so as to achieve modular splicing, and the structure of the modular Tokamak device cold screen is adapted. According to the utility model, the rapid installation and reliable fixation of the heat insulation layer are realized, the failure risk of an adhesive in a low-temperature environment is effectively avoided, the total space occupation caused by a plurality of heat insulation layers is optimized, and the stability of the heat insulation performance of the cold shield and the construction convenience are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of nuclear fusion engineering technology, specifically relating to a heat insulation device for a cold shield of a tokamak device. Background Technology

[0002] In tokamak nuclear fusion devices, the superconducting magnet system needs to operate in an extremely low temperature environment (approximately 4K), while the vacuum chamber and its internal components generate a large amount of heat during operation. To block radiative heat flow and ensure the thermal stability of the superconducting magnet, a cold shield with an intermediate temperature zone (approximately 80K) is typically installed between the vacuum chamber and the magnet. Since thermal radiation is the primary heat transfer mechanism in ultra-high vacuum environments, covering the surface of the cold shield with multiple layers of insulation is currently recognized as the most effective heat insulation method.

[0003] Existing tokamak devices (such as ITER and EAST) generally employ modular (sector-based) design for their vacuum chambers and cold shields to facilitate manufacturing, transportation, and on-site assembly (e.g., Chinese patent CN120674111B). However, the accompanying multi-layer insulation technology remains rooted in traditional small-sized container thinking, exhibiting the following significant drawbacks:

[0004] 1. The structural contradiction between modular body and continuous insulation: Although the main body of the cold shield has achieved modular splicing, existing insulation solutions often attempt to cover the spliced ​​surface of the cold shield using large-size continuous or multi-layer winding methods. This continuous skinning strategy is difficult to achieve a tight fit when facing complex geometric changes at the splicing points of the cold shield sectors (such as weld protrusions, flange interfaces, and changes in curvature of D-shaped cross-sections). Forcibly tensioning will cause the insulation layer to bulge on the concave surface, encroaching on the precious safety gap of the magnet; if laid loosely, it is prone to displacement during thermal cycling, and may even come into contact with internal components, causing short circuits or heat leakage.

[0005] 2. Fixing methods are unsuitable for extreme operating conditions: Traditional multi-layer insulation layers rely on adhesives, Velcro, or stitching for fixation. However, tokamak devices undergo drastic alternating thermal cycles from room temperature to cryogenic temperatures (4K / 80K). During this process, the vast differences in the coefficients of thermal expansion of different materials cause adhesives to age and crack easily, adhesive tapes to detach, and stitching to break due to stress concentration. Once fixation fails, the loosened insulation layer not only loses its insulating function but may also become suspended foreign objects, threatening the safety of the device.

[0006] 3. Lack of dedicated insulation design for modular interfaces: Those skilled in the art generally believe that segmentation introduces numerous seams, increasing radiative heat leakage channels, and therefore tend to avoid segmenting the insulation layer. However, this avoidance means that when installing cold shield modules, the insulation layer must be laid after the entire assembly is completed, which is difficult to carry out, time-consuming, and makes it impossible to quickly replace and maintain the insulation layer after local damage.

[0007] 4. Difficulty in controlling space occupation: Existing solutions lack effective mechanical limiting structures to constrain the thickness distribution of the insulation layer on complex curved surfaces, resulting in an uncontrollable overall profile of the insulation system, which makes it difficult to meet the stringent requirements of the next-generation compact fusion reactor for the extremely small gap between the vacuum chamber and the magnet.

[0008] In summary, there is an urgent need to develop a new type of multi-layer insulation layer that can be deeply coupled with the modular structure of the cold screen, reliably fixed by a fully mechanical method, and effectively control space occupation. Utility Model Content

[0009] To address the aforementioned technical problems, this invention provides a thermal insulation device for the cold shield of a tokamak device. It overcomes the structural mismatch between the modularity of the cold shield and the continuity of the insulation layer, ensuring a tight fit of the insulation layer at the joints of cold shield sectors and on complex curved surfaces, minimizing bulging or stress concentration. It abandons easily failing adhesive and stitching processes, providing a fully mechanical, fatigue-resistant, and thermal shock-resistant fixing mechanism to prevent the insulation layer from loosening and falling off. This invention breaks away from the traditional mindset that modularity leads to heat leakage, providing a modular insulation solution that can match the cold shield sector division for parallel installation and partial replacement, while also suppressing heat leakage at the joints through a special structure. While ensuring insulation performance, this invention strictly confines the insulation layer within a predetermined contour through structural design, preventing intrusion into the safety gaps of the magnet or vacuum chamber. This invention is applicable to cold shields with various structures, including single-wall tube sheet and double-wall tube sheet types.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A thermal insulation device for a cold shield of a tokamak device is divided into a low-temperature side thermal insulation device and a high-temperature side thermal insulation device. Both include multiple thermal insulation layers, connecting components, and T-shaped fixing blocks. The T-shaped fixing blocks pass through the cutouts in the multiple thermal insulation layers and are fixed to the surface of the cold shield cooling plate of the tokamak device to define the thickness profile of the multiple thermal insulation layers. The connecting components are located at the edge of the cold shield cooling plate and include a flange structure and connecting bolts.

[0012] The edges of the multi-layer insulation layer of the low-temperature side insulation device are bent and wrap around the flange structure from above. The multi-layer insulation layer of the high-temperature side insulation device covers the outer surface of the cold screen cooling plate and the connecting components from below. The connecting bolts pass through the adjacent flange structure to press and fix the multi-layer insulation layer to the cold screen cooling plate, forming a fully mechanical locking structure without adhesive.

[0013] The multi-layer insulation layer is divided into multiple blocks along the circumferential direction of the sector of the cold screen of the tokamak device to achieve modular splicing and adapt to the structure of the modular cold screen of the tokamak device.

[0014] Preferably, the gap between multiple blocks does not exceed 10 mm.

[0015] Preferably, the gap is filled with insulating material.

[0016] Preferably, the multilayer insulation layer is composed of at least twenty layers of polymer material films and polymer material mesh structures stacked alternately, wherein the polymer material films are aluminized polyimide and the polymer material mesh structures are polyester fiber meshes.

[0017] Preferably, the total thickness of the multi-layer insulation layer is less than 2 mm, the height of the T-shaped fixing block is slightly greater than the total thickness of the multi-layer insulation layer, and the height difference between the T-shaped fixing block and the cold screen of the tokamak device is less than 4 mm.

[0018] Preferably, the multilayer insulation layer includes a multilayer insulation layer without window obstruction and a multilayer insulation layer with window obstruction; the multilayer insulation layer without window obstruction extends from one edge of the sector of the cold screen of the tokamak device to the other edge of the flange structure; the multilayer insulation layer with window obstruction extends from one edge of the sector of the cold screen of the tokamak device to the flange structure on the side of the window.

[0019] Preferably, the multi-layered insulation layer with window barrier wraps around the flange structure on the side of the window and is fixed by connecting bolts.

[0020] Preferably, the multi-layer insulation layer has round holes or racetrack-shaped grooves on both sides, and the connecting bolts pass through the round holes or racetrack-shaped grooves.

[0021] Preferably, the T-shaped fixing block is made of a metal material with a low thermal conductivity coefficient.

[0022] Preferably, the T-shaped fixing block is fixed to the cold screen cooling plate by welding.

[0023] Beneficial effects:

[0024] 1. This utility model creatively breaks away from the traditional thinking that insulation layers must be continuous, dividing the multi-layer insulation layers into independent modules that strictly correspond to the cold shield sectors. This design allows the insulation layers to be prefabricated and pre-installed in the factory along with the cold shield modules, greatly simplifying the on-site assembly process; at the same time, when a cold shield or insulation layer is damaged, it can be quickly replaced locally without dismantling the entire insulation system, significantly improving the maintainability of the device.

[0025] 2. This utility model eliminates all adhesives and stitching, and innovatively uses a mechanical locking structure combining a T-shaped fixing block with connecting components. The T-shaped fixing block is embedded inside multiple layers of insulation to provide support, and the flanged structure utilizes the pre-tightening force of the cold-screen module splicing bolts to achieve self-locking. This structure can effectively resist the severe thermal expansion and contraction stress from room temperature to 4K, completely eliminating the risk of detachment due to glue aging or adhesive tape failure, and ensuring the safe operation of the device throughout its entire life cycle.

[0026] 3. The modular segmentation and T-shaped fixing block used in this invention ensure that the insulation layer perfectly fits the D-shaped cross-section, concave surface, and window edges of the cold shield, preventing bulging. By strictly limiting the height of the insulation layer within the height range of the fixing block, space occupation is minimized, meeting the stringent requirements of compact fusion reactors for narrow installation gaps.

[0027] 4. To address the seam problem caused by modularization, this utility model effectively blocks the radiative heat leakage path and induced current loop at the seam through precise control of the block gap (<10mm) and insulation filling design.

[0028] 5. This utility model does not rely on a specific size of cold screen. By adjusting the module division and connection component parameters, it can flexibly adapt to different types of tokamak cold screen structures such as single-wall tube sheet and double-wall tube sheet, and has great engineering promotion value. Attached Figure Description

[0029] Figure 1 A schematic diagram of an insulation device installed on the low-temperature side of a cold shield cooling plate;

[0030] Figure 2 A schematic diagram of an insulation device installed on the high-temperature side of a cold shield cooling plate;

[0031] Figure 3 A circumferential cross-sectional view of the vacuum chamber cold shield and vacuum chamber after installing a heat insulation device on the high-temperature side of the cold shield cooling plate;

[0032] Figure 4 Front view of the vacuum chamber cold screen after installing insulation on the low-temperature side of the cold screen cooling plate;

[0033] Figure 5 Enlarged top view of the vacuum chamber cold screen after installing insulation on the low-temperature side of the cold screen cooling plate;

[0034] Figure 6 Enlarged view of the main view of the vacuum chamber cold screen with the circular hole after the insulation device is installed on the low-temperature side of the cold screen cooling plate;

[0035] Figure 7 Enlarged view of the runway-shaped groove in the main view of the vacuum chamber cold screen after installing the insulation device on the low-temperature side of the cold screen cooling plate.

[0036] The attached figures are labeled as follows: 10-vacuum chamber; 1-cold shield cooling plate; 2-cold shield cooling pipe; 3-connecting assembly; 31-flanged structure; 32-connecting bolt; 4-multi-layer insulation layer; 41-multi-layer insulation layer without window obstruction; 42-multi-layer insulation layer with window obstruction; 43-round hole or racetrack-shaped groove; 5-T-shaped fixing block. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1 , Figure 2 As shown, the insulation device for a tokamak device cold shield according to this invention is divided into a low-temperature side insulation device and a high-temperature side insulation device. The cold shield cooling plate 1 can be divided into a high-temperature side and a low-temperature side depending on its orientation towards the component; the high-temperature side faces the Dewar or vacuum chamber 10, and the low-temperature side faces the magnet system. This invention can be applied to cold shields of tokamak devices of different specifications, and either a low-temperature side insulation device or a high-temperature side insulation device can be selected according to specific needs.

[0039] like Figure 1 The diagram shows a low-temperature side insulation device, which includes multiple sets of multi-layer insulation layers 4, connecting components 3, and T-shaped fixing blocks 5. A cold shield cooling plate 1 serves as the basic support, with cold shield cooling pipes 2 embedded or welded to its upper surface for active cooling. The T-shaped fixing blocks 5 pass through the multi-layer insulation layers 4 and are welded to the surface of the cold shield cooling plate 1 to define the thickness and outline of the multi-layer insulation layers 4. The multi-layer insulation layers 4 are laid flat, covering the exterior of the cold shield cooling plate 1 and the cold shield cooling pipes 2, and have bends at both ends. These bends wrap around the flange structure 31 of the connecting component 3 from above, forming a cover that covers the cold shield cooling pipes 2. The flange structure 31 of the adjacent connecting component 3 clamps the bent part, and the connecting bolt 32 passes through the adjacent flange structure 31 to firmly press and fix the edge of the multi-layer heat insulation layer 4, thereby forming a non-adhesive, fully mechanical, modular heat insulation encapsulation structure, ensuring that the heat insulation layer does not loosen or leak heat during thermal cycling and that the spatial outline is controllable.

[0040] like Figure 2The diagram shows a high-temperature side insulation device, comprising multiple sets of multi-layer insulation layers 4, connecting components 3, and T-shaped fixing blocks 5. The T-shaped fixing blocks 5 pass through the multi-layer insulation layers 4 and are fixed to the outer surface of the cooling plate 1 to support and define the thickness and contour of the multi-layer insulation layers 4. Connecting components 3 are provided on both sides of the cooling plate 1, with the bottom of the connecting components 3 flush with the cooling plate 1. The flanged structure 31 of the connecting components protrudes from the cooling plate 1. The multi-layer insulation layers 4 have bent portions at both ends, which wrap around the outer surfaces of the cooling plate 1 and connecting components 3 from below the bottom. The top of the bent portions of the multi-layer insulation layers 4 is flush with the top surface of the flanged structure 31. Figure 3 As shown, the high-temperature side insulation device can wrap the entire high-temperature side of the cold shield cooling plate 1. The flange structure 31 has round holes, which are connected to each other by connecting bolts 32. Figure 2 (Connecting bolts are not shown in the image).

[0041] like Figure 1 , Figure 2 As shown, the connecting component 3 includes a flanged structure 31 and connecting bolts 32; when the multi-layer insulation layer 4 is installed on the cold screen, it should have a certain pre-tightening force in the circumferential direction to avoid a decrease in the constraint capacity of the multi-layer insulation layer due to the difference in thermal expansion coefficients when the cold screen cools down as a whole. The bottom thickness of the connecting component 3 is the same as that of the cold screen cooling plate 1.

[0042] Preferred, such as Figure 6 , Figure 7 As shown, the multi-layer insulation layer 4 of the low-temperature side insulation device has round holes or racetrack-shaped grooves 43 at the bends for installation on the connecting assembly 3.

[0043] Preferably, the multi-layer insulation layer 4 also has a cross-shaped cut or strip-shaped opening of a certain size in the middle; the cut or strip-shaped opening is used to insert the T-shaped fixing block 5.

[0044] Preferably, the T-shaped fixing block 5 is a structure made of a metal material with a low thermal conductivity, and its height is slightly greater than the thickness of the multilayer insulation layer.

[0045] like Figure 4 The image shows an insulation device installed on the low-temperature side of a cold shield cooling plate. Figure 4 The cold shield in the tokamak device is one of multiple sectors divided along the circumferential direction. The multi-layer insulation layer 4 adapts to the number of sectors divided along the circumferential direction in the cold shield of the tokamak device.

[0046] Preferably, when the multi-layer insulation layer 4 is divided into blocks in the circumferential direction, in addition to the blocks needed near the window and at the connection points of each sector of the cold screen, the blocks needed in the relatively integral areas of the cold screen cooling plate in the circumferential direction should be divided according to the mechanical properties and quality of the multi-layer insulation layer 4 itself.

[0047] Preferably, when installing the multi-layer insulation layer 4 on the low-temperature side, it is divided into 7 sections circumferentially to reduce the electromagnetic force and gravity load on the multi-layer insulation layer 4. During the sectioning, the distance between adjacent sections of multiple sets of multi-layer insulation layers 4 should not exceed 10mm to reduce heat leakage between the section gaps. The section gaps between the sectors of the cold shield are filled with insulating material, thereby reducing heat leakage while achieving electrical insulation. When the multi-layer insulation layer 4 is installed on the low-temperature side, the surface of the cold shield cooling plate 1 is concave (it should be explained here that the concave surface can be determined by...). Figure 2 and Figure 4 It can be seen, but because Figure 3 This is a circumferential cross-sectional view, therefore Figure 3 (The concave surface is not visible in the image). If installed directly, the multi-layer insulation layer 4 will become flat under tension, increasing the space occupied by the cold shield. Therefore, a T-shaped fixing block 5 needs to be welded to the surface of the cold shield cooling plate 1 so that the flat multi-layer insulation layer 4 can be close to the concave surface of the cold shield cooling plate 1 under the action of the T-shaped fixing block 5, thereby reducing the space occupied by the cold shield. At the highest point of the equipment or pipeline, the multi-layer insulation layer 4 may bulge, shift, or exceed the design boundary due to its own thickness, manufacturing tolerances, thermal expansion and contraction, or installation looseness. To prevent this, the T-shaped fixing block 5 is used to ensure that the outline of the multi-layer insulation layer 4 at this point does not exceed the space range defined by the T-shaped fixing block 5. The T-shaped fixing block 5 is welded to the cold shield cooling plate 1 and is not fixedly connected to the multi-layer insulation layer 4; it is only inserted into the cutout on the multi-layer insulation layer 4.

[0048] When installed in other locations, since each block of the multi-layer insulation layer 4 has a large area, the geometric footprint may exceed the limit. Therefore, T-shaped fixing blocks 5 need to be installed as needed to limit the geometric footprint of the multi-layer insulation layer in these places and ensure the thermal shielding effect of the cold screen.

[0049] Preferably, when necessary, the T-shaped fixing block 5 can be welded to the surface of the cold screen cooling plate 1 where multiple layers of heat insulation need to be installed.

[0050] like Figure 5 As shown, when installing the multi-layer insulation layer 4 on the low-temperature side, the multi-layer insulation layer 4 includes a multi-layer insulation layer 41 without window obstruction and a multi-layer insulation layer 42 with window obstruction. The multi-layer insulation layer 41 without window obstruction is supported by T-shaped fixing blocks 5 to prevent collapse and is also fixed by connecting bolts 32. The multi-layer insulation layer 42 with window obstruction is covered and sealed by the flange structure 31 of the connecting component 3, and finally the edges of the multi-layer insulation layer are firmly locked to the cold screen cooling plate 1 by the connecting bolts 32 passing through the flange structure 31.

[0051] like Figure 5As shown, in order to adapt to the irregular structure of the vacuum chamber cold shield, especially the irregular structure near the window cold shield, this utility model adds a flange structure 31 with a length less than the polar length of the window at 50mm on both sides of the window cold shield in the circumferential direction; near the window and at the edge of the cold shield block, the multi-layer heat insulation layer 4 is divided into a multi-layer heat insulation layer 41 without window obstruction and a multi-layer heat insulation layer 42 with window obstruction in the circumferential direction; for the multi-layer heat insulation layer 41 without window obstruction, its length is the same as the distance between the flange structures on both sides of the cold shield sector, and it is fixed by connecting bolts 32. Preferably, the total thickness of the multi-layer insulation layer 4 does not exceed 2mm, thus ensuring that the area of ​​the non-cold screen cooling plate 1 in the cold screen sector does not exceed 5mm, avoiding large-scale heat leakage; for the multi-layer insulation layer 42 with window obstruction, its length is the distance from the flange structure of one edge of the cold screen sector to the flange structure on the side of the window, and it is fixed by fastening the connecting bolts 32, so that the multi-layer insulation layer can adapt to the irregular structure of the vacuum chamber cold screen while achieving full mechanical fixation without increasing the space occupied by the cold screen; multiple sets of multi-layer insulation layers 4 form multiple blocks, which can achieve basic coverage of the cold screen.

[0052] Preferably, the multilayer insulation layer 4 is composed of at least twenty layers of polymer film and a multilayer polymer mesh structure, which has a good effect of reflecting or blocking radiative heat transfer. In this invention, the multilayer insulation layer 4 is composed of alternating shielding layers and spacer layers, with the outermost layer being a shielding layer. The shielding layer is a thin coating of a low emissivity material (e.g., aluminum); between these shielding layers, a multilayer polymer mesh structure (e.g., polyester mesh) is provided as a filler material, serving as a spacer layer.

[0053] Preferably, the shielding layer uses aluminized polyimide (Kapton) with a reflectivity greater than 90%, and the spacer layer uses polyester fiber mesh such as Dacron® B4A & B2A series; wherein the thickness of the aluminized polyimide (Kapton) is approximately 0.01 mm, and the thickness of the polyester fiber mesh is generally approximately 0.02 mm; the multilayer insulation layer obtained by this combination can ensure that the overall emissivity is less than 0.1 and the thermal conductivity is not higher than 0.1 W / m K when the cold vacuum pressure (CVP) is less than 0.01 millitorr. Under the coverage of this multilayer insulation layer, the heat flux density received or emitted by the surface of the cold shield can be effectively reduced.

[0054] For the high-temperature side insulation device and the low-temperature side insulation device, during installation, the multi-layer insulation layer 4 is first installed by inserting T-shaped fixing blocks 5 into the cuts on the multi-layer insulation layer 4 to initially determine its position. After the position is determined, the multi-layer insulation layer 4 is unfolded to cover the cold screen cooling plate 1 and / or the cold screen cooling pipe 2 and the connecting assembly 3, and round holes are made at the corresponding positions of the connecting assemblies 3 on both sides of the cold screen sector. After making the round holes, during installation of the cold screen sector, the connecting bolts 32 in the connecting assembly 3 are passed through the multi-layer insulation layer 4. Since the connecting bolts 32 will be tightened during installation of the cold screen sector, the multi-layer insulation layer 4 is naturally fixed. After installation, the excess multi-layer insulation layer 4 is cut off based on the size of the flange structure 31. According to the sectors divided by the cold screen, the insulation devices for each corresponding sector are installed through the flange structure 31 and the connecting bolts 32.

[0055] Preferably, the cold shield can be a single-wall tube sheet or a double-wall tube sheet structure, wherein the cooling pipes are welded to the low-temperature side.

[0056] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat insulation device for a cold shield of a tokamak device, characterized in that, It is divided into a low-temperature side insulation device and a high-temperature side insulation device. Both include multiple insulation layers, connecting components and T-shaped fixing blocks. The T-shaped fixing blocks pass through the cuts of the multiple insulation layers and are fixed to the surface of the cold screen cooling plate of the tokamak device to define the thickness profile of the multiple insulation layers. The connecting components are located at the edge of the cold screen cooling plate and include a flange structure and connecting bolts. The edges of the multi-layer insulation layer of the low-temperature side insulation device are bent and wrap around the flange structure from above. The multi-layer insulation layer of the high-temperature side insulation device covers the outer surface of the cold screen cooling plate and the connecting components from below. The connecting bolts pass through the adjacent flange structure to press and fix the multi-layer insulation layer to the cold screen cooling plate, forming a fully mechanical locking structure without adhesive. The multi-layer insulation layer is divided into multiple blocks along the circumferential direction of the sector of the cold screen of the tokamak device to achieve modular splicing and adapt to the structure of the modular cold screen of the tokamak device.

2. The thermal insulation device for a cold shield of a tokamak device according to claim 1, characterized in that, The gap between multiple blocks shall not exceed 10 mm.

3. The heat insulation device for a cold shield of a tokamak device according to claim 2, characterized in that, The gap is filled with insulating material.

4. The heat insulation device for a cold shield of a tokamak device according to claim 1, characterized in that, The multilayer insulation layer is composed of at least twenty layers of polymer material films and polymer material mesh structures stacked alternately. The polymer material films are aluminized polyimide, and the polymer material mesh structures are polyester fiber meshes.

5. The heat insulation device for a cold shield of a tokamak device according to claim 1, characterized in that, The total thickness of the multi-layer insulation layer is less than 2 mm.

6. The heat insulation device for a cold shield of a tokamak device according to claim 1, characterized in that, The multilayer insulation layer includes a multilayer insulation layer without window obstruction and a multilayer insulation layer with window obstruction; the multilayer insulation layer without window obstruction extends from one edge of the sector of the cold screen of the tokamak device to the other edge of the flange structure; the multilayer insulation layer with window obstruction extends from one edge of the sector of the cold screen of the tokamak device to the flange structure on the side of the window.

7. The heat insulation device for a cold shield of a tokamak device according to claim 6, characterized in that, The multi-layered insulation layer with window barrier wraps around the flange structure on the side of the window and is fixed by connecting bolts.

8. The heat insulation device for a cold shield of a tokamak device according to claim 1, characterized in that, The multi-layer insulation layer has round holes or racetrack-shaped grooves on both sides, and the connecting bolts pass through the round holes or racetrack-shaped grooves.

9. The heat insulation device for a cold shield of a tokamak device according to claim 1, characterized in that, The T-shaped fixing block is made of a metal material with a low thermal conductivity.

10. The heat insulation device for a cold shield of a tokamak device according to claim 1, characterized in that, The T-shaped fixing block is fixed to the cold screen cooling plate by welding.

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