Maintainable semi-fixed plug-in structure of compact fusion reactor and assembling and maintaining method

Abstract

The invention discloses a maintainable semi-fixed plug-in structure of a compact fusion reactor and an assembling and maintaining method. The plug-in structure comprises a fixed assembly, a first wall assembly, a shielding block assembly, a maintainable assembly and a sealing flange assembly. The fixing assembly is fixedly installed in a vacuum chamber neck tube, the shielding block assembly is inserted into the fixing assembly, and a shielding block cooling pipeline is arranged in the shielding block assembly. The first wall assembly is detachably fixed to the end face, exposed out of the vacuum chamber neck tube, of the shielding block assembly, and a first wall connecting tube is fixed to the end, facing the vacuum chamber neck tube, of the shielding block assembly. The maintainable assembly comprises a pipeline assembly, a support assembly and a maintainable subsystem support penetrating through the shielding block assembly to be inserted into the vacuum chamber neck tube. The pipeline assembly is inserted into the support assembly, and the pipeline assembly, the shielding block cooling pipeline and the first wall cooling pipeline are sequentially connected. The sealing flange assembly is detachably connected with the vacuum chamber neck tube. The requirement for the installation space is relatively small, quick-wear parts of the plug-in can be independently maintained, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of installation and maintenance of compact fusion reactors, and in particular to a maintainable semi-fixed plug-in structure of a compact fusion reactor and an assembly and maintenance method thereof. Background Art

[0002] In existing compact fusion reactors, the window plug-ins mostly adopt a structural solution that integrates a whole plug-in and is inserted or removed from the outside of the vacuum chamber window for installation and maintenance. Due to structural limitations of some windows, there is no sufficient operating space for the installation and maintenance of the structure. In addition, the entire plug-in needs to be removed for maintenance, which makes maintenance more cumbersome.

[0003] Specifically, existing solutions require the complete removal of the vacuum chamber neck tube during installation and maintenance, which requires ample space. However, the space surrounding the vacuum chamber is complex, and some neck tubes lack sufficient atmospheric space, making existing solutions impractical. Furthermore, each maintenance operation requires the complete removal of the entire insert, separating all internal components before maintenance can be performed. This is complex and results in significant component wear and tear.

[0004] Secondly, the prior art with publication number CN117457240A also describes a vacuum chamber system for a magnetic confinement fusion reactor, which includes an upper window, a middle window, and a lower window. These three sets of windows are used for diagnostics, heating, and vacuuming of the magnetic confinement fusion reactor, thereby maintaining the normal operation and data collection of the nuclear fusion reactor. Each window needs to be equipped with corresponding equipment to achieve the corresponding function. At the same time, the fusion reactor will produce a large amount of neutrons and other fusion products during operation. To prevent these products from affecting the external environment, neutron shielding, cooling, and sealing of the vacuum chamber need to be achieved at the window. Therefore, each window needs to be equipped with a corresponding window plug-in to achieve functions such as integrating internal equipment, isolating heat, and achieving neutron shielding and equipment sealing. Since the fusion reactor generates electromagnetic forces in the vacuum chamber system during operation, the plug-in structure needs to reduce the electromagnetic forces it is subjected to while being able to withstand the electromagnetic forces it receives.

[0005] Another existing solution, presented in Xia Yibin's "Structural Analysis and Research of the ITER Horizontal Diagnostic Window Insert," consists of a first wall, a shielding block assembly, and an outer shell. The first wall blocks most of the heat from the plasma, while the shielding block assembly integrates the internal equipment and provides a safe and reliable operating environment. The outer shell provides a mounting location for the internal structure and connects to the vacuum chamber, providing a reliable seal. The insert is installed as a single unit and is pushed into the corresponding window from the atmospheric side of the vacuum chamber. Once installed, it can be operated and removed from its original path for maintenance.

[0006] It can be seen that the prior art requires a large space for insertion and removal of the plug-in structure, has relatively high requirements for the installation environment, and the entire plug-in must be removed for each maintenance, resulting in high maintenance costs. Summary of the Invention

[0007] In response to the deficiencies in the prior art, the present invention provides a compact fusion reactor maintainable semi-fixed plug-in structure and an assembly and maintenance method, which requires relatively little installation space and can perform separate maintenance on the plug-in's wearing parts, reducing maintenance costs. The compact fusion reactor maintainable semi-fixed plug-in structure of the present invention is semi-permanently assembled. After assembly, the limited space can be utilized to maintain the vulnerable parts inside the plug-in structure. At the same time, the weight is reduced by dividing the first wall component of the plug-in structure into blocks, so that part of the structure can be installed and maintained from inside the vacuum chamber.

[0008] To achieve the above object, the present invention provides the following technical solutions: A compact fusion reactor maintainable semi-fixed plug-in structure includes a fixed component, a first wall component, a shielding block component, a maintainable component, and a sealing flange component, wherein the first wall component is fixed with a first wall connecting pipe at one end facing the vacuum chamber neck tube, and two sections of first wall cooling pipes are installed in the first wall component; the fixed component is a columnar cage structure and is coaxially fixedly installed in the vacuum chamber neck tube, the shielding block component is inserted into the fixed component by plugging through a rectangular guide edge integrally provided at the bottom, and is fixedly installed in the fixed component, and a number of insulating ceramic sheets are sandwiched between the shielding block assembly and the inner wall of the fixed assembly, and a shielding block cooling pipe is also provided in the shielding block assembly.

[0009] The first wall component is a plate-like structure and is detachably fixed to an end face of the shielding block component exposed from the vacuum chamber neck tube; the maintainable component includes a pipe component, a bracket component, and a first maintainable subsystem bracket and a second maintainable subsystem bracket inserted into the vacuum chamber neck tube through the shielding block component; the bracket component is provided with a plurality of spaced notches along its length direction, the pipe component is inserted into the bracket assembly along the notches arranged in a straight line, and is simultaneously fixed to the shielding block assembly and the fixing component, the pipe assembly, the shielding block cooling pipe, and the first wall cooling pipe are connected in sequence; the sealing flange assembly is coaxially and detachably connected to the other end face of the vacuum chamber neck tube, and the port of the pipe assembly extends out of the sealing flange assembly.

[0010] Furthermore, the first wall assembly includes wall panels spliced ​​together, and the first wall connecting pipe is fixed across one end of the vacuum chamber neck tube between two adjacent wall panels, and a section of the first wall cooling pipe is respectively provided in two wall panels facing each other on one side.

[0011] Furthermore, the sealing flange assembly includes a sealing flange and a metal sealing ring, and the sealing flange and the vacuum chamber neck tube are sealed by the metal sealing ring.

[0012] Furthermore, the shielding block assembly includes a shielding block main block and a shielding block supplementary block, the bottom of the shielding block main block is provided with the rectangular guide edge, and the shielding block supplementary block is axially plugged and installed on the shielding block main block.

[0013] In addition, the present invention also provides a method for assembling a maintainable semi-fixed plug-in structure of a compact fusion reactor, comprising the following steps: Push the fixed assembly into the vacuum chamber neck tube and weld it at a predetermined position to complete the assembly of the fixed assembly; open an insulating isolation groove on the fixed assembly, and place a first insulating gasket in the insulating isolation groove; push the shielding block main body into the fixed assembly, and detachably fix the shielding block main body to the fixed assembly to complete the assembly of the main part of the shielding block assembly; the first maintainable subsystem bracket and the second maintainable subsystem bracket are detachably fixed together to form a maintainable subsystem bracket assembly; insert the maintainable subsystem bracket assembly into the vacuum chamber neck tube along the shielding block main body, and detachably fix the maintainable subsystem bracket assembly to the fixed assembly to complete the assembly of the maintainable subsystem bracket assembly; Insert the bracket assembly into the vacuum chamber neck tube, place it in the corresponding position, and weld it to the vacuum chamber neck tube; then insert the pipe assembly along the several notches reserved on the bracket assembly. After reaching the predetermined position, connect the shielding block cooling pipe with the shielding block main block and the maintainable subsystem bracket assembly through internal pipe welding, and then weld the shielding block flow channel sealing plate in front of the shielding block cooling pipe, so that the cooling pipe of the pipe assembly and the cooling system inside the shielding block assembly form a complete loop, completing the assembly of the maintainable assembly; detachably fix the shielding block supplementary block to the shielding block main block and the fixed assembly; then weld the shielding block connecting pipes in sequence, so that the cooling system of the shielding block assembly forms a complete loop, completing the assembly of the shielding block assembly; The first wall assembly is detachably fixed to the shielding block assembly, the first wall connecting pipes are welded in sequence, the first wall cooling pipe in the pipe assembly is welded to the first wall assembly through inner pipe welding, and the first wall flow channel sealing plate is welded directly in front of the first wall cooling pipe, so that the cooling pipe and the internal cooling system of the first wall assembly form a complete loop, completing the assembly of the first wall assembly; the sealing flange is detachably fixed to the vacuum chamber neck tube, and the metal sealing ring between the two is compressed; the feedthroughs of water, electricity, gas and other systems are connected to the sealing flange to complete the assembly of the maintainable semi-fixed window plug-in.

[0014] Furthermore, the maintainable subsystem bracket assembly is fixed to the fixing assembly using screws, screw insulating washers, second insulating washers, third insulating washers, and fourth insulating washers.

[0015] Furthermore, the shielding block supplementary block is fixed to the shielding block main block and the fixing assembly using round head screws, screw insulating washers, and the fifth insulating washers, the sixth insulating washers, and the seventh insulating washers.

[0016] Furthermore, a metal sealing ring is placed at the atmosphere side opening of the vacuum chamber neck tube, and a sealing flange is fixed to the vacuum chamber neck tube using screws to tighten the metal sealing ring.

[0017] Finally, the present invention also proposes a maintenance method for a compact fusion reactor maintainable semi-fixed plug-in structure. During maintenance, the liquid in all cooling pipes is drained, all feedthroughs are cut off from the sealing flange assembly, and the sealing flange assembly is removed; then the first wall connecting pipe is cut off from the side facing the vacuum chamber neck tube to remove the first wall assembly; then the pipeline assembly, the first maintainable subsystem bracket, the second maintainable subsystem bracket and the first wall assembly system can be replaced and maintained, and the window plug-in is reassembled according to the steps of assembling the maintainable assembly and the first wall assembly to complete the maintenance.

[0018] Furthermore, when the first wall connecting pipe is cut off, the connection between the first wall cooling pipe and the first wall assembly is also cut off, and then the connection between the shielding block cooling pipe and the shielding block assembly is cut off, and then the pipe assembly is pulled out from the atmosphere side.

[0019] The present invention provides a compact fusion reactor maintainable semi-fixed plug-in structure and assembly and maintenance method, which mainly has the following beneficial effects: 1. The plug-in structure of the present invention includes a fixed part and a maintainable part. The maintainable component is designed according to the actual space limitations and consists of a maintainable subsystem bracket component, a pipe component, and a bracket component. The maintainable component can be inserted and removed from the atmospheric side.

[0020] 2. The maintenance solution for the plug-in structure of the present invention is to remove the first wall assembly from the vacuum chamber side and extract the maintainable assembly from the atmosphere side. The first wall assembly is fixed to the shielding block by screwing screws from the front, and the maintainable subsystem bracket is also fixed to the fixed assembly by screwing screws from the front, which facilitates the removal of the first wall assembly and the maintainable assembly from the vacuum chamber side. The first wall assembly, the maintainable subsystem bracket, the shielding block assembly, and the pipe assembly are welded together by the front inner pipe. The cooling system between the first walls is connected by the first wall connecting pipe, and the cooling system of the shielding block assembly and the maintainable bracket assembly is connected by the shielding block connecting pipe. All of these can be welded and removed from the vacuum chamber side, facilitating maintenance of the cooling system.

[0021] 3. Use screws, screw insulation washers, and insulation washers to connect the shielding block assembly, fixed assembly, and maintainable subsystem bracket to ensure mutual insulation between the parts and reduce electromagnetic force. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the appearance structure of the present invention; Figure 2 An exploded view of a section of the structure of the present invention; Figure 3 An exploded view of another structure of the present invention; Figure 4 It is a schematic structural diagram of the first wall assembly when it is disassembled from the neck tube of the vacuum chamber; Figure 5 It is a structural schematic diagram of the first wall assembly being installed on the neck tube of the vacuum chamber; Figure 6 It is a partial structural diagram of the shielding block assembly; Figure 7 It is a structural diagram of the fixed component; Figure 8 This is a schematic diagram showing the shielding block main body being installed in the fixing assembly; Figure 9 For shielding block supplementary block installation into Figure 8 Schematic diagram of the structure shown; Figure 10 This is a schematic diagram of the installation of the first maintainable subsystem bracket when it is inserted into the vacuum chamber neck tube along the shielding block assembly; Figure 11 It is a schematic diagram of the installation structure of the bracket assembly and the pipeline assembly; Figure 12 The diagram below shows the installation diagram of the flange assembly.

[0023] In the figure: 1. First wall assembly, 2. Vacuum chamber neck tube, 3. First maintainable subsystem bracket, 4. Second insulating gasket, 5. Fixing assembly, 6. Fifth insulating gasket, 7. Seventh insulating gasket, 8. Shielding block supplementary block, 9. First wall fixing hole three, 10. First wall fixing hole two, 11. First wall fixing hole one, 12. First wall fixing hole four, 13. Shielding block main body, 14. Sixth insulating gasket, 15 Third insulating gasket, 16. First insulating gasket, 17. Sealing Sealing flange, 18. Metal sealing ring, 19. Pipe assembly, 20. Bracket assembly, 21. Second maintainable subsystem bracket, 22. Fourth insulating gasket, 23. First wall connecting pipe, 24. Shielding block cooling pipe, 25. Shielding block flow channel sealing plate, 26. First wall fixing position one, 27. First wall fixing position four, 28. Shielding block connecting pipe, 29. First wall fixing position three, 30. First wall fixing position two, 31. First wall flow channel sealing plate, 32. First wall cooling pipe. DETAILED DESCRIPTION

[0024] This specification will clearly and completely express the technical solutions in the following embodiments based on the drawings of the embodiments of the present invention. The implementation methods described in this specification are only some of the embodiments of the present invention, not all of them. All other embodiments derived from these embodiments in this application by persons of ordinary skill in the art without any creative effort should fall within the scope of protection of the present invention.

[0025] The compact fusion reactor in this embodiment can maintain a semi-fixed plug-in structure, such as Figure 1-Figure 3 As shown, it mainly includes a fixing component 5, a first wall component 1, a shielding block component, a maintainable component, and a sealing flange component. Figure 4 , wherein the first wall component 1 is fixedly mounted with a first wall connecting pipe 23 at one end thereof facing the vacuum chamber neck pipe 2. Figure 5 , two sections of first wall cooling pipes 32 are installed in the first wall assembly 1. Specifically, the first wall assembly 1 may include four wall panels spliced ​​together, with a U-shaped first wall connecting pipe 23 fixed across the adjacent wall panels toward one end of the vacuum chamber neck tube 2. In addition, a section of the first wall cooling pipe 32 mentioned above is respectively provided in two wall panels facing each other on one side of the first wall assembly 1. In this embodiment, Figure 7-Figure 8 The fixed assembly 5 is a columnar cage structure and is coaxially fixedly installed in the vacuum chamber neck tube 2. The shielding block assembly is inserted into the fixed assembly 5 by plugging through the rectangular guide edge provided on the bottom, and is fixedly installed in the fixed assembly 5. Several insulating ceramic sheets are sandwiched between the shielding block assembly and the inner wall of the fixed assembly. A shielding block cooling pipe 24 is also provided in the shielding block assembly. Figure 5 The first wall component 1 is a plate-like structure and is detachably fixed to one end face of the shielding block component that is exposed to the vacuum chamber neck tube 2; the fixing component 5 is fixed to the vacuum chamber neck tube 2 by screws, welding, etc. In this embodiment, the shielding block component is fixed to the fixing component 5 by screws, and an insulating ceramic sheet is sandwiched at the contact point between the two to minimize the conductive contact between the shielding block component and the fixing component 5, thereby reducing the electromagnetic force. The first wall component 1 is fixed to the shielding block component by screws, which is easy to disassemble. Figure 3The maintainable assembly includes a pipe assembly 19, a bracket assembly 20, and a first maintainable subsystem bracket 3. These are inserted from the atmospheric side and fixed to the shielding block assembly and the fixing assembly 5. The shielding block cooling pipe 24 in the pipe assembly 19, along with the shielding block assembly and the cooling system (i.e., the corresponding cooling pipes) in the first wall assembly 1, form a complete cooling circuit. The sealing flange assembly includes a sealing flange 17 and a metal sealing ring 18. The sealing flange 17 and the vacuum chamber neck tube 2 are sealed using screws and a metal sealing ring 18. Water, electricity, gas, and other systems are sealed from the outside world via a sealed feedthrough. A sealed feedthrough is a connection device in a nuclear fusion reactor that primarily maintains system sealing and enables energy or media transmission in extreme physical environments. The sealed feedthrough establishes a channel between the interior of the nuclear fusion reactor (such as the vacuum chamber or cryostat) and external systems for transporting cooling media. Therefore, its specific structure is not described in this embodiment. In this embodiment, the shielding block assembly and the maintainable subsystem bracket assembly can provide a sufficiently safe working environment. For subsystems that do not require maintenance, space can be set in the shielding block main block 13 to place the installation subsystem; for subsystems that require frequent maintenance, they can be installed in the maintainable subsystem bracket assembly and installed in the window plug-in together with other maintainable components. The maintainable subsystem bracket assembly should be designed according to the specific space limitations inside and outside the vacuum chamber neck tube.

[0026] During assembly, first push the fixing assembly 5 into the vacuum chamber neck tube 2 and weld it at a predetermined position to complete the assembly of the fixing assembly 5. Figure 2 , put the first insulating gasket 16 of the same shape into an insulating isolation groove of the fixing component 5, and push the shielding block main block 13 into the fixing component 5, as shown Figure 6 and Figure 8-Figure 9 The shielding block main body 13 is fixed to the fixing assembly 5 with round head screws 34 and screw insulating washers 33 to complete the assembly of the main part of the shielding block assembly.

[0027] The first maintainable subsystem bracket 3 and the second maintainable subsystem bracket 21 are fixed together by screws. Figure 3 As shown in the figure, slide and plug in the installation to assemble the maintainable subsystem bracket assembly. Figure 10 As shown, the maintainable subsystem bracket assembly is inserted into the vacuum chamber neck tube 2 along the shielding block main body 13, and the maintainable subsystem bracket assembly is fixed to the fixing assembly 5 using screws, screw insulating gaskets 33, second insulating gaskets 4, third insulating gaskets 15 and fourth insulating gaskets 22 to complete the assembly of the maintainable subsystem bracket assembly.

[0028] Insert the bracket assembly 20 into the vacuum chamber neck tube from the atmosphere side, place it in the corresponding position and weld it to the vacuum chamber neck tube 2. Figure 11As shown, the pipe assembly 19 is inserted along the notch reserved on the bracket assembly 20. After reaching the predetermined position, the shielding block cooling pipe 24 is connected to the shielding block main block 13 and the maintainable subsystem bracket assembly through internal pipe welding. The technical principle of internal pipe welding is to fill the welding material into the pipe wall and form a weld by melting the welding material and the metal inside the pipe. This welding method does not significantly change the outer diameter of the pipe, and the inner wall is smooth, which helps to reduce the accumulation of dirt. After the shielding block cooling pipe 24 is fixed to the shielding block main block 13 and the maintainable subsystem bracket assembly, Figure 4 , seal the shield block flow channel 25 ( Figure 4 The shielding block flow channel sealing plate 25 in the shielding block (which is not closed and connected to the end of the shielding block cooling pipe 24 for independent display) is welded to the front of the shielding block cooling pipe 24, so that the corresponding cooling pipe and the cooling system or cooling pipe inside the shielding block assembly form a complete loop, completing the assembly of the maintainable component.

[0029] In the above embodiments, Figure 2 、 Figure 6 and Figure 9 As shown, the shielding block supplementary block 8 needs to be fixed to the shielding block main block 13 and the fixed component 5 using screws, screw insulating gaskets 33 and the fifth insulating gasket 6, the sixth insulating gasket 14, and the seventh insulating gasket 7, and then the shielding block connecting pipe 28 is welded in sequence to form a complete loop of the cooling system of the shielding block assembly, thereby completing the assembly of the shielding block assembly.

[0030] like Figure 5 , fix the four wall panels of the first wall assembly 1 to the shielding block assembly by screws, as shown Figure 4 As shown, the first wall connecting pipe 23 is welded in sequence, and the Figure 5 and Figure 11 The pipe assembly 19, the shielding block cooling pipe 24, and the first wall cooling pipe 32 are connected in sequence through inner pipe welding and welded together with the first wall assembly 1, and the first wall flow channel sealing plate 31 is welded directly in front of the first wall cooling pipe 32, so that the above-mentioned cooling pipe and the internal cooling system of the first wall assembly 1 form a complete loop, completing the assembly of the first wall assembly 1.

[0031] like Figure 3 and Figure 12 As shown, place the metal sealing ring 18 at the atmosphere-side opening of the vacuum chamber neck tube 2, i.e., with the end of the vacuum chamber neck tube 2 facing outward. Use screws to secure the sealing flange 17 to the vacuum chamber neck tube 2, tightening the metal sealing ring 18. Connect the feedthroughs for water, electricity, gas, and other systems to the sealing flange to complete the assembly of the maintainable semi-fixed window insert.

[0032] During maintenance, drain all liquid from all cooling circuits, cut off all feedthroughs from the sealing flange 17, and remove the sealing flange 17 and metal sealing ring 18. Then, cut off the first wall connecting pipe 23 and the connection between the first wall cooling pipe 32 and the first wall assembly 1 from the vacuum chamber side. Remove the screws securing each wall panel on the first wall assembly 1, and the first wall assembly 1 can be removed. Then, cut off the connection between the shielding block cooling pipe 24 and the shielding block assembly, and remove the pipe assembly 19 from the atmosphere side. The pipe assembly 19, the first maintainable subsystem bracket 3, the second maintainable subsystem bracket 21, and the first wall assembly 1 system can then be replaced and maintained. Follow the steps for assembling the maintainable components and the first wall assembly 1, and reassemble the window plug-in to complete maintenance.

[0033] It should be explained here that, in this specification, terms such as first and second are only used to distinguish one feature from another, and do not mean that there is a certain relationship or order between these technical features. The terms "include" and "comprise" refer to the inclusion of one or certain technical means or features, specifically meaning that there are other existing or non-existing technical features that have not been included. The discussion in the above embodiments is only a referential example for the present invention, and is by no means the only restrictive constraint feature. Those skilled in the art should understand that, without departing from the technical content recorded in all claims of this application, some simple replacements and modifications can be made, thereby changing or becoming equivalent to other specific embodiments and application scenarios. However, no matter how the adaptive changes are made, these embodiments will inevitably fall within the scope of protection of the present invention.

Claims

1. A compact fusion reactor maintainable semi-fixed plug-in structure, characterized in that: It comprises a fixing component (5), a first wall component (1), a shielding block component, a maintainable component, and a sealing flange component, wherein: The first wall component (1) is fixed with a first wall connecting pipe (23) at one end thereof facing the vacuum chamber neck tube (2), and the first wall component (1) is connected to the maintainable component by being connected to two sections of first wall cooling pipes (32); the fixed component (5) is a columnar cage structure and is coaxially fixedly installed in the vacuum chamber neck tube (2); the shielding block component is inserted into the fixed component (5) by means of a guide ridge integrally provided at the bottom and is fixedly installed in the fixed component (5); a plurality of insulating ceramic sheets are sandwiched between the shielding block component and the inner wall of the fixed component, and a shielding block cooling pipe (24) is also provided in the shielding block component; The first wall component (1) is a plate-like structure and is detachably fixed to an end face of the shielding block component exposed to the vacuum chamber neck tube (2); the maintainable component comprises a pipe component (19), a bracket component (20), and a first maintainable subsystem bracket (3) and a second maintainable subsystem bracket (21) inserted into the vacuum chamber neck tube (2) through the shielding block component; the pipe component (19), the shielding block cooling pipe (24), and the first wall cooling pipe (32) are connected in sequence; the sealing flange component is coaxially detachably connected to the other end face of the vacuum chamber neck tube (2), and the port of the pipe component (19) extends out of the sealing flange component.

2. A compact fusion reactor maintainable semi-fixed plug-in structure according to claim 1, characterized in that: The first wall assembly (1) comprises four wall panels spliced ​​together, a first wall connecting pipe (23) is fixed across one end of the vacuum chamber neck tube (2) between two adjacent wall panels, and a section of the first wall cooling pipe (32) is provided in each of two wall panels facing each other vertically on one side.

3. The compact fusion reactor maintainable semi-fixed plug-in structure according to claim 1, characterized in that: The sealing flange assembly comprises a sealing flange (17) and a metal sealing ring (18), and the sealing flange (17) and the vacuum chamber neck tube (2) are sealed via the metal sealing ring (18).

4. The compact fusion reactor maintainable semi-fixed plug-in structure according to claim 1, characterized in that: The shielding block assembly comprises a shielding block main block (13) and a shielding block supplementary block (8), the bottom of the shielding block main block (13) is provided with the guide edge, and the shielding block supplementary block (8) is axially plugged and mounted on the upper surface of one end of the shielding block main block (13); an insulating gasket is provided at the connection between the shielding block main block (13) and the shielding block supplementary block (8) to insulate them from each other; an insulating gasket is also provided at the contact position between the shielding block assembly and the fixed assembly (5).

5. A method for assembling the maintainable semi-fixed plug-in structure of a compact fusion reactor as claimed in claim 4, characterized in that: The following steps are involved: S1, pushing the fixing assembly (5) into the vacuum chamber neck tube (2), welding it at a predetermined position, and completing the assembly of the fixing assembly (5); S2. An insulating isolation groove is opened on the fixed component (5), and a first insulating gasket (16) is placed in the insulating isolation groove. The shielding block main body (13) is pushed into the fixed component (5), and the shielding block main body (13) is detachably fixed to the fixed component (5), thereby completing the assembly of the main part of the shielding block component; S3, the first maintainable subsystem bracket (3) and the second maintainable subsystem bracket (21) are detachably fixed together to form a maintainable subsystem bracket assembly; the maintainable subsystem bracket assembly is inserted into the vacuum chamber neck tube (2) along the shielding block body (13), and the maintainable subsystem bracket assembly is detachably fixed to the fixing assembly (5), thereby completing the assembly of the maintainable subsystem bracket assembly; S4. Insert the bracket assembly (20) into the vacuum chamber neck tube, place it in the corresponding position, and weld it to the vacuum chamber neck tube (2); then insert the pipe assembly (19) along the notch reserved on the bracket assembly (20). After reaching the predetermined position, connect the shielding block cooling pipe (24) to the shielding block main block (13) and the maintainable subsystem bracket assembly through internal pipe welding, and then weld the shielding block flow channel sealing plate (25) in front of the shielding block cooling pipe (24), so that the cooling pipe (33) of the pipe assembly (19) and the cooling system inside the shielding block assembly form a complete loop, completing the assembly of the maintainable assembly; S5, detachably fixing the shielding block supplementary block (8) to the shielding block main block (13) and the fixing assembly (5); then sequentially welding the shielding block connecting pipes (28) to form a complete circuit for the cooling system of the shielding block assembly, thereby completing the assembly of the shielding block assembly; S6. The first wall assembly (1) is detachably fixed to the shielding block assembly, and the first wall connecting pipe (23) is welded in sequence. The first wall cooling pipe (32) in the pipe assembly (19) is welded to the first wall assembly (1) by inner pipe welding, and the first wall flow channel sealing plate (31) is welded directly in front of the first wall cooling pipe (32), so that the cooling pipe (33) and the internal cooling system of the first wall assembly (1) form a complete loop, thereby completing the assembly of the first wall assembly (1); S7. The sealing flange (17) is detachably fixed to the vacuum chamber neck tube (2), and the metal sealing ring (18) between the two is compressed; the feedthroughs of water, electricity, gas and other systems are connected to the sealing flange to complete the assembly of the maintainable semi-fixed window plug-in.

6. The method for assembling a compact fusion reactor maintainable semi-fixed plug-in structure according to claim 5, characterized in that: In step S3, the maintainable subsystem bracket assembly is fixed to the fixing assembly (5) using screws, screw insulating washers, second insulating washers (4), third insulating washers (15) and fourth insulating washers (22).

7. The method for assembling a maintainable semi-fixed plug-in structure for a compact fusion reactor according to claim 5, characterized in that: In step S5, the shielding block supplementary block (8) is fixed to the shielding block main block (13) and the fixing assembly (5) with the screw (34), the screw insulating gasket (33), the fifth insulating gasket (6), the sixth insulating gasket (14), and the seventh insulating gasket (7).

8. The method for assembling a maintainable semi-fixed plug-in structure for a compact fusion reactor according to claim 5, characterized in that: In step S7, the metal sealing ring (18) is placed at the atmosphere side opening of the vacuum chamber neck tube (2), and the sealing flange (17) is fixed to the vacuum chamber neck tube (2) using screws to tighten the metal sealing ring (18).

9. A maintenance method for the maintainable semi-fixed plug-in structure of a compact fusion reactor according to any one of claims 1 to 4, characterized in that: During maintenance, drain all liquids from the cooling pipes, cut off all feedthroughs from the sealing flange assembly, and remove the sealing flange assembly; then cut off the first wall connecting pipe (23) from the side facing the vacuum chamber neck tube (2) to remove the first wall assembly (1); then the pipe assembly (19), the first maintainable subsystem bracket (3), the second maintainable subsystem bracket (21) and the first wall assembly (1) system can be replaced and maintained, and the window plug-in is reassembled according to the steps of assembling the maintainable assembly and the first wall assembly (1) to complete the maintenance.

10. The maintenance method of the maintainable semi-fixed plug-in structure of a compact fusion reactor according to claim 9, characterized in that: When the first wall connecting pipe (23) is cut off, the connection between the first wall cooling pipe (32) and the first wall assembly (1) is also cut off, and then the connection between the shielding block cooling pipe (24) and the shielding block assembly is cut off, and then the pipe assembly (19) is extracted from the atmosphere side.

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