Support structure for securing a low field side blanket of a fusion reactor

Abstract

The application belongs to the technical field of support of low-field side blanket of fusion reactor, and discloses a support structure for fixing low-field side blanket of fusion reactor. The first limiting assembly realizes radial limitation of the top end of the first blanket, the second limiting assembly realizes radial limitation of the top end of the second blanket and polar limitation of the top end of the second blanket during operation, and the third limiting assembly realizes radial and polar limitation of the bottom end of the first blanket and the second blanket. The application can realize installation and removal of remote maintenance of low-field side blanket, is convenient to operate, and provides more reliable support for low-field side blanket in limited space.

Description

Technical Field

[0001] This invention belongs to the field of support technology for the low-field side blanket of fusion reactors, and particularly relates to a support structure for fixing the low-field side blanket of fusion reactors. Background Technology

[0002] Magnetic confinement fusion energy is considered the most likely way to solve humanity's energy crisis in the future. The breeder blanket is one of the core components of a fusion device, and its main functions are tritium breeding, energy conversion, and nuclear radiation shielding. Located inside the vacuum chamber, closer to the core plasma region, the breeder blanket operates under extremely harsh conditions, including high temperatures (approximately 600°C), significant thermal stress, and instantaneous electromagnetic loads from plasma disruption. Therefore, maintenance of the breeder blanket is required (approximately every two years). Furthermore, the fusion reaction can cause radioactive contamination of the breeder blanket, so maintenance personnel cannot enter the vacuum chamber during maintenance and must perform maintenance remotely.

[0003] One existing ITER (International Thermonuclear Experimental Reactor) blanket support structure scheme uses a single-module design, connecting each blanket to the vacuum chamber. With a total of 440 blankets, each needs to be installed individually, hindering rapid installation and removal for blanket maintenance. Future and current magnetic confinement fusion devices will employ a multi-module design for the breeder blanket, with a conceptual design for replacing the vertical port blanket already established. The plan is to have 16 vertical windows (upper windows) at the top of the vacuum chamber, each corresponding to 5 blanket segments: 3 low-field side blankets and 2 high-field side blankets. The low-field side intermediate blanket is located directly below the upper windows, where the support structure cannot be directly connected to the vacuum chamber, making confinement of the low-field side intermediate blanket particularly challenging.

[0004] Another existing blanket support structure uses a backplate and connecting structure to fix the blanket to the vacuum chamber, which occupies more space and reduces the breeding area of ​​the breeding blanket, making it difficult to achieve tritium self-sufficiency. To ensure that the breeding blanket can achieve tritium self-sufficiency, the tritium growth rate (TBR) should be greater than or equal to 1.15. This requires the breeding blanket to be as large as possible. However, the internal space of the vacuum chamber is limited, so the breeding blanket and the vacuum chamber are relatively compact, leaving even less space for the support structure.

[0005] Another existing type of cladding support structure uses bolts to fix the top radial support structure to the vacuum chamber. However, under significant thermal stress and intense vibration, the bolts are prone to fatigue damage or even breakage, making the cladding support structure unreliable and increasing the difficulty of remote operation. To reduce the operations required for remote operation tools, the cladding support structure should avoid using locking components such as bolts and pins as much as possible. Summary of the Invention

[0006] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, one object of this invention is to provide a support structure for fixing the low-field side blanket of a fusion reactor, which enables remote maintenance installation and removal of the low-field side blanket, is easy to operate, and provides more reliable support for the low-field side blanket within a limited space.

[0007] A support structure for fixing the low-field side blanket of a fusion reactor according to an embodiment of the present invention includes: A vacuum chamber, the top of which is fixed with a vertically extending upper window; A low-field side cladding is disposed in the vacuum chamber and is divided into a first cladding directly opposite the upper window and a second cladding circumferentially adjacent to the first cladding. The first limiting component is fixed on the upper window and is limited to blocking the inner side of the top of the first cladding layer to achieve radial constraint on the top of the first cladding layer. The second limiting component includes a limiting boss, a limiting base, and a supporting pad. The limiting boss is integrally machined and fixed to or welded to the outer surface of the top end of the second cladding. The limiting base is welded to the inner wall of the vacuum chamber and has a first limiting part and a second limiting part. The first limiting part is limited on the inner side of the limiting boss and located below the second limiting part to achieve radial constraint on the top end of the second cladding. The supporting pad is removably positioned on the top surface of the limiting boss and leaves a first gap between it and the second limiting part, so that the second cladding can freely expand thermally in the polar direction during operation, thereby allowing the upper surface of the supporting pad to contact the second limiting part to achieve polar constraint on the top end of the second cladding during operation. The third limiting component includes a support base and a support block. The support base is welded and fixed to the inner wall of the vacuum chamber. The support blocks are welded and fixed to the outer bottom surfaces of the first cladding layer and the second cladding layer respectively and supported on the support base, so as to achieve radial and polar constraints on the bottom ends of the first cladding layer and the second cladding layer.

[0008] In some embodiments, the first limiting component includes a shielding plug component and a limiter. The shielding plug component is fixed in the upper window, and the limiter is welded to the shielding plug component. The limiter is positioned on the inner side of the top end of the first cladding layer to achieve radial constraint on the top end of the first cladding layer.

[0009] In some embodiments, a fixing flange is fixed to the inner periphery of the upper window; the shielding plug assembly includes a first shielding plug, a second shielding plug, and a third shielding plug arranged radially from the inside out, the top ends of the first shielding plug, the second shielding plug, and the third shielding plug respectively having a first outward flange, a second outward flange, and a third outward flange; the fixing flange is sleeved on the upper outer periphery of the whole formed by the first shielding plug, the second shielding plug, and the third shielding plug, the first outward flange, the second outward flange, and the third outward flange are supported on the top surface of the fixing flange and fastened by bolts; the limiter is welded and fixed to the lower end of the second shielding plug.

[0010] In some embodiments, the limiter is located inside the top end of the first cladding layer, and the limiter has an outer limiting surface in the radial direction, the outer limiting surface being in close contact with the inner surface of the top end of the first cladding layer.

[0011] In some embodiments, the top surface of the limiting boss is provided with a positioning protrusion, and the bottom surface of the support pad is provided with a positioning groove, the positioning groove being adapted to the positioning protrusion.

[0012] In some embodiments, the spacing of the first gap is greater than the height of the positioning protrusion.

[0013] In some embodiments, the limiting base has a base groove with an opening facing downward, the base groove having a first sidewall and a second sidewall that are opposite to each other in the radial direction, the first sidewall being the first limiting portion and located inside the second sidewall, and the bottom wall of the base groove being the second limiting portion; The limiting boss extends upward into the base groove. The limiting boss has an inner side surface and an outer side surface that are opposite to each other in the radial direction. The inner side surface of the boss is in close contact with the first sidewall, and the outer side surface of the boss is not in contact with the second sidewall.

[0014] In some embodiments, the top of the support base is provided with a support base groove, the support base groove is arc-shaped and extends circumferentially, the support base groove has a third sidewall and a fourth sidewall opposite to each other in the radial direction, the third sidewall is located inside the fourth sidewall, the third sidewall is arranged at an inclination, and the edge of the third sidewall near the notch of the support base groove is located in the radial direction near the edge of the bottom of the third sidewall near the notch of the support base groove. The bottom surface of the support block is arranged at an inclination. The support block is located in the groove of the support seat and the bottom surface of the support block is in close contact with the third side wall. The side of the support block away from the second cladding is in close contact with the concave bottom surface of the groove of the support seat. The top surface of the support block does not contact the fourth side wall.

[0015] In some embodiments, the groove width of the support seat groove gradually increases from the bottom surface of the groove towards the opening; correspondingly, the width between the bottom surface and the top surface of the support block gradually increases from the side of the support block away from the second cladding towards the second cladding.

[0016] In some embodiments, the vacuum chamber is further provided with a lower window; the support base is provided with a cooling channel, and an external cooling pipe connected to the cooling channel passes through the lower window.

[0017] The support structure for fixing the low-field side blanket of a fusion reactor according to embodiments of the present invention has the following advantages: 1. The first limiting component is connected to the upper window to achieve radial limiting of the top of the first cladding layer. The second limiting component achieves radial limiting of the top of the second cladding layer and polar limiting of the top of the second cladding layer during operation. The third limiting component achieves radial and polar limiting of the bottom of the first and second cladding layers. The circumferentially adjacent arrangement of the low-field side cladding layer achieves circumferential limiting of the first and second cladding layers. By using limiting support without bolts, pins, or other locking structures, the first and second cladding layers are constrained in three directions: polar, radial, and circumferential. The support strength is safe and reliable, and the constraint support of the first and second cladding layers is convenient.

[0018] Second, the first, second, and third limiting components have simple structures and use limiting supports instead of locking structures such as bolts and pins. The first and second cladding layers are easy to maintain remotely. For example, the second cladding layer can be maintained by remotely removing the support pad. Furthermore, during remote maintenance, the support block does not need to be completely removed from the support base to complete the maintenance of the first and second cladding layers. In addition, it can also achieve rapid installation and removal of the first and second cladding layers.

[0019] Third, there are no bolts, pins or other locking components between the vacuum chamber and the support structure of the low field side cladding (such as the first limiting component, the second limiting component and the third limiting component), which can prevent the bolts or pins or other locking components from loosening or fatigue damage, thus making the support structure of the low field side cladding unreliable.

[0020] Fourth, since the first limiting component only radially constrains the top of the first cladding layer, the first cladding layer is allowed to expand freely in the extreme upward direction during operation, which can prevent stress concentration caused by the compression between the first cladding layer and the vacuum chamber; since the first gap is left between the support pad and the second limiting part, the second cladding layer can thermally expand freely in the extreme upward direction during operation, which can prevent stress concentration caused by the compression between the second cladding layer and the vacuum chamber.

[0021] Fifth, by setting the cooling channel in the support base, the large thermal deformation of the support base can be effectively suppressed during operation, thereby improving the reliability of the support structure used to fix the low field side blanket of the fusion reactor.

[0022] In summary, the support structure for fixing the low-field side blanket of the fusion reactor according to the embodiments of the present invention is relatively simple, can realize the rapid installation and removal of the low-field side blanket for maintenance, and can reliably support and constrain the low-field side blanket within a limited space.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a support structure for fixing the low-field side blanket of a fusion reactor according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the vacuum chamber and part of the supporting structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the low-field side cladding and part of the support structure in an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation of the first limiting component in an embodiment of the present invention; Figure 5 This is an exploded view of the first limiting component in an embodiment of the present invention; Figure 6 This is a schematic diagram of the installation of the second limiting component in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the second limiting component in an embodiment of the present invention; Figure 8 This is an exploded view of the limiting boss and the supporting pad in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the third limiting component in an embodiment of the present invention; Figure 10 This is a schematic diagram of the internal structure of the support base in an embodiment of the present invention.

[0025] Figure Labels Vacuum chamber 1; Low-field side cladding 2; First cladding 201; Second cladding 202; First limiting assembly 3; Shielding plug assembly 301; First shielding plug 3011; Second shielding plug 3012; Third shielding plug 3013; Fixed flange 3014; Limiter 302; Outer limiting surface 3021; ​​Second limiting assembly 4; Limiting boss 401; Positioning protrusion 4011; Inner side of boss 4012; Outer side of boss 4013; Limiting base 402; Base groove 402 1; First limiting part 40211; Second limiting part 40212; Second side wall 40213; Support pad 403; Positioning groove 4031; First gap 404; Second gap 405; Third limiting component 5; Support seat 501; Support seat groove 5011; Third side wall 50111; Fourth side wall 50112; Cooling channel 5012; External cooling pipe 5013; Support block 502; Third gap 503; Upper window 6; Middle window 7; Lower window 8. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The following is combined Figures 1 to 10 This invention describes a support structure for fixing the low-field side blanket of a fusion reactor, according to an embodiment of the present invention.

[0028] like Figures 1 to 10 As shown, the support structure for fixing the low-field side blanket of a fusion reactor according to an embodiment of the present invention includes a vacuum chamber 1, a low-field side blanket 2, a first limiting component 3, a second limiting component 4, and a third limiting component 5.

[0029] The vacuum chamber 1 has a vertically extending upper window 6 fixed to its top. The upper window 6 and the vacuum chamber 1 are two independently manufactured components, which are fixed together by welding. It should be noted that, typically, multiple upper windows 6 are fixed circumferentially on the top of the vacuum chamber 1, and middle windows 7 and lower windows 8 are also fixed to the middle and lower parts of the vacuum chamber 1, with the number of middle windows 7 and lower windows 8 being the same as the number of upper windows 6.

[0030] The low-field side cladding 2 is disposed inside the vacuum chamber 1 and is divided into a first cladding 201 directly opposite the upper window 6 and a second cladding 202 circumferentially adjacent to the first cladding 201. Specifically, the top of the vacuum chamber 1 is fixed with multiple upper windows 6, such as 16 upper windows 6, along the circumferential direction. Each upper window 6 corresponds to three low-field side cladding 2, namely one first cladding 201 and two second cladding 202. The first cladding 201 is located directly below the upper window 6 and is adjacent to the two second cladding 202 in the circumferential direction. The top of the first cladding 201 is lower than the top of the second cladding 202.

[0031] The first limiting component 3 is fixed to the upper window 6 instead of the vacuum chamber 1, and only blocks the inner side of the top end of the first cladding layer 201 to provide radial constraint on the top end of the first cladding layer 201, preventing the top end of the first cladding layer 201 from tilting inward, which is beneficial for achieving reliable radial support for the first cladding layer 201. By fixing the first limiting component 3 to the upper window 6, it is convenient to provide radial constraint support for the upper end of the first cladding layer 201.

[0032] The second limiting component 4 includes a limiting boss 401, a limiting base 402, and a supporting pad 403. The limiting boss 401 is integrally machined and fixed to or welded to the top outer surface of the second cladding 202, that is, the corresponding limiting boss 401 is integrally machined with the second cladding 202 or the corresponding limiting boss 401 is welded to the second cladding 202.

[0033] The limiting base 402 is welded and fixed to the inner wall of the vacuum chamber 1. The limiting base 402 has a first limiting part 40211 and a second limiting part 40212. The first limiting part 40211 is limited on the inner side of the limiting boss 401 and is located below the second limiting part 40212 to achieve radial constraint on the top end of the second cladding 202, preventing the upper end of the corresponding second cladding 202 from tilting inward, which is conducive to achieving reliable radial support for the second cladding 202. The support pad 403 is removably positioned on the top surface of the limiting boss 401 and leaves a first gap 404 between it and the second limiting part 40212, so that the second cladding 202 can freely expand thermally in the polar direction during operation, thereby making the upper surface of the support pad 403 contact the second limiting part 40212 to achieve polar constraint on the top end of the second cladding 202 during operation, which is conducive to achieving reliable polar support for the second cladding 202 during operation. The support pad 403 is removably positioned on the top surface of the limiting boss 401. During maintenance of the lower cladding layer 2, the support pad 403 can be removed remotely to facilitate maintenance of the corresponding second cladding layer 202.

[0034] The third limiting component 5 includes a support base 501 and a support block 502. The support base 501 is welded and fixed to the inner wall of the vacuum chamber 1. The support block 502 is welded and fixed to the outer side of the bottom end of the first cladding layer 201 and the second cladding layer 202 respectively and supported on the support base 501, so as to realize radial and polar constraints on the bottom end of the first cladding layer 201 and the second cladding layer 202, and realize reliable radial and polar support on the bottom end of the first cladding layer 201 and the second cladding layer 202.

[0035] The support structure for fixing the low-field side blanket of a fusion reactor according to embodiments of the present invention has the following advantages: First, the first limiting component 3 is connected to the upper window 6 to achieve radial limiting of the top end of the first cladding layer 201. The second limiting component 4 achieves radial limiting of the top end of the second cladding layer 202 and polar limiting of the top end of the second cladding layer 202 during operation. The third limiting component 5 achieves radial and polar limiting of the bottom ends of the first cladding layer 201 and the second cladding layer 202. The circumferential limiting of the first cladding layer 201 and the second cladding layer 202 is achieved by the circumferentially adjacent arrangement of the lower field side cladding layer 2. Thus, by using limiting support without using bolts, pins or other locking structures, the first cladding layer 201 and the second cladding layer 202 are constrained in the polar, radial and circumferential directions. The support strength is safe and reliable, and the constraint support of the first cladding layer 201 and the second cladding layer 202 is convenient.

[0036] Second, the first limiting component 3, the second limiting component 4, and the third limiting component 5 have simple structures. They use limiting supports instead of locking structures such as bolts and pins, making remote maintenance of the first cladding layer 201 and the second cladding layer 202 convenient. For example, maintenance of the second cladding layer 202 can be performed by remotely removing the support pad 403. Furthermore, during remote maintenance, the support block 502 does not need to be completely removed from the support base 501 to complete the maintenance of the first cladding layer 201 and the second cladding layer 202. In addition, it can also achieve rapid installation and removal of the first cladding layer 201 and the second cladding layer 202.

[0037] 3. There are no bolts, pins or other locking components between the support structure of the vacuum chamber 1 and the low field side cladding 2 (such as the first limiting component 3, the second limiting component 4 and the third limiting component 5) to prevent the bolts or pins or other locking components from loosening or fatigue damage, which would make the support structure of the low field side cladding 2 unreliable.

[0038] Fourth, since the first limiting component 3 only radially constrains the top of the first cladding 201, the first cladding 201 is allowed to expand freely in the extreme direction during operation, which can prevent stress concentration caused by the compression between the first cladding 201 and the vacuum chamber 1; since the first gap 404 is left between the support pad 403 and the second limiting part 40212, the second cladding 202 can expand freely in the extreme direction during operation, which can prevent stress concentration caused by the compression between the second cladding 202 and the vacuum chamber 1.

[0039] In summary, the support structure for fixing the low-field side blanket of the fusion reactor according to the embodiments of the present invention is relatively simple, can realize the rapid installation and removal of the low-field side blanket for maintenance, is easy to operate, and can reliably support and constrain the low-field side blanket 2 in a limited space.

[0040] In some embodiments, the first limiting component 3 includes a shielding plug component 301 and a limiter 302. The shielding plug component 301 is fixed in the upper window 6 and serves as a radiation shield. The limiter 302 is welded to the shielding plug component 301 and limits the upper end of the first cladding layer 201 to achieve radial constraint on the upper end of the first cladding layer 201. Thus, the first limiting component 3 has a simple structure and is not directly connected to the vacuum chamber 1. The limiter 302 is fixed to the upper window 6 through the shielding plug component 301. By limiting the upper end of the first cladding layer 201 radially, the limiter 302 provides radial constraint and support to the upper end of the first cladding layer 201, ensuring reliable support.

[0041] In some embodiments, a fixing flange 3014 is fixed to the inner periphery of the upper window 6. Specifically, the fixing flange 3014 is welded to the inner periphery of the upper window 6 or integrally machined with the upper window 6. The shielding plug assembly 301 includes a first shielding plug 3011, a second shielding plug 3012, and a third shielding plug 3013 arranged radially from the inside out. The top ends of the first shielding plug 3011, the second shielding plug 3012, and the third shielding plug 3013 respectively have a first outward flange, a second outward flange, and a third outward flange. Fixing method The flange 3014 is fitted onto the upper outer periphery of the assembly consisting of the first shielding plug 3011, the second shielding plug 3012, and the third shielding plug 3013. The first, second, and third outer flanges are supported on the top surface of the fixed flange 3014 and secured with bolts. This allows for easy installation and removal of the first, second, and third shielding plugs 3011, 3012, and 3013, ensuring convenient operation and reliable connection. The limiter 302 is welded and fixed to the lower end of the second shielding plug 3012, ensuring a reliable connection between the two. Therefore, the first limit assembly 3 has a simple structure, facilitating convenient maintenance, installation, and removal of the low-field side cladding 2.

[0042] In some embodiments, the limiter 302 is located inside the top end of the first cladding 201. The limiter 302 has an outer limiting surface 3021 in the radial direction. The outer limiting surface 3021 is in close contact with the inner surface of the top end of the first cladding 201. In this way, the limiter 302 provides radial limiting constraint to the top end of the first cladding 201, which provides reliable support and facilitates maintenance, installation and removal.

[0043] In some embodiments, the top surface of the limiting boss 401 is provided with a positioning protrusion 4011, and the bottom surface of the support pad 403 is provided with a positioning groove 4031. The positioning groove 4031 is adapted to the positioning protrusion 4011 to prevent the support pad 403 from moving on the plane. In addition, the support pad 403 is easy to install and remove. Specifically, the number of positioning protrusions 4011 can be one, and the positioning protrusion 4011 is polygonal, such as rectangular; correspondingly, the number of positioning grooves 4031 can be one, and the positioning groove 4031 is polygonal, such as rectangular.

[0044] In some embodiments, the spacing of the first gaps 404 is greater than the height of the positioning protrusions 4011. This allows for easy maintenance by lifting the support pad 403 upwards and then moving it laterally. The spacing of the first gaps 404 can be 20mm.

[0045] In some embodiments, the limiting base 402 has a base groove 4021 with its opening facing downwards. The base groove 4021 has a first sidewall and a second sidewall 40213 that are radially opposite to each other. The first sidewall is a first limiting part 40211 and is located inside the second sidewall 40213. The bottom wall of the base groove 4021 is a second limiting part 40212. A limiting boss 401 extends upwards into the base groove 4021. The limiting boss 401 has an inner surface 4012 and an outer surface 4013 that are radially opposite to each other. The inner surface 4012 is in close contact with the first sidewall, and the outer surface 4013 does not contact the second sidewall 40213. That is, there is a second gap 405 between the outer surface 4013 and the second sidewall 40213. The spacing of the second gap 405 can be 20mm. Thus, reliable radial support for the second cladding layer 202 is achieved, and installation and maintenance are convenient.

[0046] In some embodiments, the top of the support base 501 is provided with a support base groove 5011. The support base 501 is arc-shaped and extends in a ring. The support base groove 5011 is arc-shaped and extends in a ring direction. The support base groove 5011 has a third sidewall 50111 and a fourth sidewall 50112 that are opposite to each other in the radial direction. The third sidewall 50111 is located inside the fourth sidewall 50112. The third sidewall 50111 is arranged at an inclination. The edge of the third sidewall 50111 near the notch of the support base groove 5011 is located in the radial direction near the edge of the bottom of the notch of the third sidewall 50111. The bottom surface of the support block 502 is inclined and located in the support seat groove 5011, with the bottom surface of the support block 502 in close contact with the third side wall 50111. The side of the support block 502 away from the second cladding layer 202 is in close contact with the concave bottom surface of the support seat groove 5011. The top surface of the support block 502 does not contact the fourth side wall 50112, that is, there is a third gap 503 between the top surface of the support block 502 and the fourth side wall 50112, and the spacing of the third gap 503 can be 20mm. This facilitates radial and polar constraint support for the bottom end of the first cladding layer 201 and the bottom end of the second cladding layer 202, and makes maintenance, installation, and removal convenient.

[0047] In some embodiments, the groove width of the support base groove 5011 gradually increases from the bottom surface of the groove towards the opening; correspondingly, the width between the bottom surface and the top surface of the support block 502 gradually increases from the side of the support block 502 away from the second cladding 202 towards the second cladding 202. This facilitates maintenance, installation, and removal.

[0048] In some embodiments, the vacuum chamber 1 is further fixed with a lower window 8; a cooling channel 5012 is provided inside the support 501, and an external cooling pipe 5013 connected to the cooling channel 5012 passes through the lower window 8. By providing a cooling channel 5012 inside the support 501, large thermal deformation of the support 501 can be effectively suppressed during operation, thereby improving the reliability of the support structure used to fix the low-field side blanket of the fusion reactor.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be regarded as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A support structure for fixing the low-field side blanket of a fusion reactor, characterized in that, include: A vacuum chamber, the top of which is fixed with a vertically extending upper window; A low-field side cladding is disposed in the vacuum chamber and is divided into a first cladding directly opposite the upper window and a second cladding circumferentially adjacent to the first cladding. The first limiting component is fixed on the upper window and is limited to blocking the inner side of the top of the first cladding layer to achieve radial constraint on the top of the first cladding layer. The second limiting component includes a limiting boss, a limiting base, and a supporting pad. The limiting boss is integrally machined and fixed to or welded to the outer surface of the top end of the second cladding. The limiting base is welded to the inner wall of the vacuum chamber and has a first limiting part and a second limiting part. The first limiting part is limited on the inner side of the limiting boss and located below the second limiting part to achieve radial constraint on the top end of the second cladding. The supporting pad is removably positioned on the top surface of the limiting boss and leaves a first gap between it and the second limiting part, so that the second cladding can freely expand thermally in the polar direction during operation, thereby allowing the upper surface of the supporting pad to contact the second limiting part to achieve polar constraint on the top end of the second cladding during operation. The third limiting component includes a support base and a support block. The support base is welded and fixed to the inner wall of the vacuum chamber. The support blocks are welded and fixed to the outer bottom surfaces of the first cladding layer and the second cladding layer respectively and supported on the support base, so as to achieve radial and polar constraints on the bottom ends of the first cladding layer and the second cladding layer.

2. The support structure for fixing the low-field side blanket of a fusion reactor according to claim 1, characterized in that, The first limiting component includes a shielding plug component and a limiter. The shielding plug component is fixed in the upper window, and the limiter is welded to the shielding plug component. The limiter is positioned on the inner side of the top end of the first cladding layer to achieve radial constraint on the top end of the first cladding layer.

3. The support structure for fixing the low-field side blanket of a fusion reactor according to claim 2, characterized in that, A fixing flange is fixed to the inner periphery of the upper window; the shielding plug assembly includes a first shielding plug, a second shielding plug, and a third shielding plug arranged radially from the inside out, the top ends of the first shielding plug, the second shielding plug, and the third shielding plug respectively having a first outward flange, a second outward flange, and a third outward flange; the fixing flange is sleeved on the upper outer periphery of the whole formed by the first shielding plug, the second shielding plug, and the third shielding plug, the first outward flange, the second outward flange, and the third outward flange are supported on the top surface of the fixing flange and fastened by bolts; the limiter is welded and fixed to the lower end of the second shielding plug.

4. The support structure for fixing the low-field side blanket of a fusion reactor according to claim 2, characterized in that, The limiter is located inside the top of the first cladding layer, and the limiter has an outer limiting surface in the radial direction, which is in close contact with the inner surface of the top of the first cladding layer.

5. The support structure for fixing the low-field side blanket of a fusion reactor according to claim 1, characterized in that, The top surface of the limiting boss is provided with a positioning protrusion, and the bottom surface of the support pad is provided with a positioning groove, which is adapted to the positioning protrusion.

6. The support structure for fixing the low-field side blanket of a fusion reactor according to claim 5, characterized in that, The spacing of the first gap is greater than the height of the positioning protrusion.

7. The support structure for fixing the low-field side blanket of a fusion reactor according to claim 1, characterized in that, The limiting base has a base groove with an opening facing downwards. The base groove has a first sidewall and a second sidewall that are opposite to each other in the radial direction. The first sidewall is the first limiting part and is located inside the second sidewall. The bottom wall of the base groove is the second limiting part. The limiting boss extends upward into the base groove. The limiting boss has an inner side surface and an outer side surface that are opposite to each other in the radial direction. The inner side surface of the boss is in close contact with the first sidewall, and the outer side surface of the boss is not in contact with the second sidewall.

8. The support structure for fixing the low-field side blanket of a fusion reactor according to claim 1, characterized in that, The top of the support base is provided with a support base groove, the support base groove is arc-shaped and extends in the circumferential direction, the support base groove has a third side wall and a fourth side wall opposite to each other in the radial direction, the third side wall is located inside the fourth side wall, the third side wall is arranged at an inclination, and the edge of the third side wall near the notch of the support base groove is located in the radial direction near the edge of the bottom of the notch of the support base groove. The bottom surface of the support block is arranged at an inclination. The support block is located in the groove of the support seat and the bottom surface of the support block is in close contact with the third side wall. The side of the support block away from the second cladding is in close contact with the concave bottom surface of the groove of the support seat. The top surface of the support block does not contact the fourth side wall.

9. The support structure for fixing the low-field side blanket of a fusion reactor according to claim 1, characterized in that, The groove width of the support seat gradually increases from the bottom surface of the groove towards the opening; correspondingly, the width between the bottom surface and the top surface of the support block gradually increases from the side of the support block away from the second cladding towards the second cladding.

10. The support structure for fixing the low-field side blanket of a fusion reactor according to claim 1, characterized in that, The vacuum chamber is also fixed with a lower window; the support base is provided with a cooling channel, and an external cooling pipe connected to the cooling channel passes through the lower window.

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