A plasma unit structure for divertor and welding method thereof

Abstract

The present invention relates to the technical field of divertor, and discloses a plasma unit structure for a divertor and a welding method thereof. The structure comprises a support base and a plasma unit; the support base is used to fix the plasma unit, the support base comprises a second cooling pipe, the second cooling pipe is arranged at one end of the support base, and the second cooling pipe extends toward the plasma unit; the plasma unit is arranged above the support base, the plasma unit comprises a main body, a first cooling pipe and a water box body, one end of the first cooling pipe is connected to the main body, and the other end is connected to the water box body, the water box body comprises a lower cover plate and a side cover plate, a first through hole is formed at the top end of the water box body for connecting to the first cooling pipe, a second through hole is formed at one end of the water box body close to the support base, the lower cover plate is arranged at one end of the water box body away from the first through hole, and the side cover plate is arranged at one end of the water box body away from the second through hole.

Description

Technical Field

[0001] The present invention relates to the technical field of divertor of a tokamak fusion device, and in particular to a plasma unit structure for a divertor and a welding method thereof. Background Art

[0002] As a core internal component of a magnetic confinement tokamak fusion device, the divertor's primary function is to remove heat and particle flux from the core plasma to ensure proper operation. The divertor plasma cell intersects the scraped layer and bears the greatest steady-state heat load on the internal component surfaces. Therefore, a common practice is to supply coolant to the plasma cell from a support base, cooling it and removing heat to keep the maximum temperature of the component materials within the allowable temperature range.

[0003] The divertor is composed of an inner target plate, a dome, an outer target plate, and a box body. The inner target plate, the dome, and the outer target plate are composed of multiple plasma units and a support base. In the prior art, plasma units mostly adopt a flat plate structure and a through-tube structure. The general processing method of the flat plate structure is to use brazing to fix the tungsten copper block to the composite plate formed by explosion welding of chromium zirconium copper and stainless steel; the through-tube structure is usually to fix pure copper to the tungsten block by casting, and then use hot isostatic pressing to connect it with the chromium zirconium copper. Regardless of which structure is adopted, the pipes need to be connected to the support base at the back. The gap between the pipes is only about 15-30mm. The support base and the plasma unit are processed separately and then connected together by pins. The pipes between them are finally welded. This poses the problem of welding in a small space. The welding gun cannot circle the pipe all the way around, making pipe welding difficult. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that in the prior art, it is difficult to weld the divertor plasma unit and the support base in a narrow space.

[0005] In order to solve the above technical problems, the present invention provides a plasma unit structure for a divertor, which includes a support base and a plasma unit; the support base is used to fix the plasma unit, and the support base includes a second cooling pipe, which is arranged at one end of the support base and extends toward the plasma unit; the plasma unit is arranged above the support base, and the plasma unit includes a main body, a first cooling pipe and a water box body, one end of the first cooling pipe is connected to the main body, and the other end is connected to the water box body, the water box body includes a lower cover plate and a side cover plate, a first through hole is provided at the top of the water box body for connecting to the first cooling pipe, and a second through hole is provided at one end of the water box body close to the support base for connecting to the second cooling pipe, the lower cover plate is provided at one end of the water box body away from the first through hole, and the side cover plate is provided at one end of the water box body away from the second through hole.

[0006] In one embodiment, the main body further includes two supporting parts, which are arranged below the main body and spaced apart along the length direction of the main body. A supporting hole is formed on each supporting part.

[0007] In one embodiment, a plurality of fasteners are staggeredly arranged along the width direction of the support base at one end of the support base away from the plasma unit, and the fasteners are arranged in a one-to-one correspondence with the plasma units.

[0008] In one embodiment, each fastener includes two fixing parts, which are spaced apart along the length direction of the main body, and the spacing distance between the two fixing parts is the same as the distance between the two supporting parts. Each fixing part is provided with a corresponding hole.

[0009] In one embodiment, the fastener further includes a pin member, which passes through the supporting hole and the corresponding hole along the width direction of the main body, and is used to connect the fixing portion and the supporting portion.

[0010] In one embodiment, there are multiple second cooling tubes, and the multiple second cooling tubes are spaced apart along the width direction of the main body, and the horizontal heights of two adjacent second cooling tubes are different.

[0011] In one embodiment, there are multiple plasma units, and the multiple plasma units are arranged at intervals along the width direction of the support base. The tube body length of the first cooling tube in each plasma unit is different, and the horizontal heights of two adjacent first through holes are different. The first through holes and the second cooling tubes are arranged in a one-to-one correspondence.

[0012] Another aspect of the present invention provides a welding method for welding the plasma unit structure for a divertor, comprising the following steps:

[0013] S1, welding and fixing the main body and the first cooling tube in the plasma unit;

[0014] S2. Weld the water box body and the first cooling pipe to fix them. After the water box body and the first cooling pipe are fixed, weld the lower cover plate to the water box body;

[0015] S3. After the lower cover is welded and fixed, the plasma unit is mounted on the support base. The position of the water box body is adjusted so that the second cooling pipe on the support base is connected to the second through hole on the water box body. At the same time, the support portion on the plasma unit is aligned with the fixed portion on the support base.

[0016] S4. Insert the pins into the supporting part and the fixing part, weld the water box body and the second cooling pipe on the front, and weld the side cover plate to the water box body.

[0017] Compared with the prior art, the plasma unit structure and welding method for a divertor according to an embodiment of the present invention have the following advantages: 1) a support base, serving as the supporting foundation for the entire structure and responsible for fixing and supporting the plasma unit, includes a second cooling tube extending from one end of the support base and oriented toward the plasma unit to facilitate connection of the plasma unit; 2) a plasma unit, comprising a main body, a first cooling tube, and a water box body. The plasma unit utilizes a decomposed water box body, which is welded to the first cooling tube through a first through-hole on the water box body, and further welded to a lower cover plate. The plasma unit with the water box body is then connected to the support base. The position of the plasma unit is adjusted to align the second through-hole on the water box body with the second cooling tube on the support base, and the second through-hole and second cooling tube are welded together, and then the side cover plate on the water box body is welded. This solution effectively solves the problem of welding pipe connections within the confined space of a fusion device divertor, and has the advantages of safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the present invention before installation.

[0019] Figure 2 Schematic diagram of the plasma unit structure according to an embodiment of the present invention.

[0020] Figure 3 A schematic diagram of the structure of an embodiment of the present invention after installation.

[0021] In the figure, 1. support base; 11. second cooling pipe; 12. fastener; 121. fixing portion; 122. pin member; 2. plasma unit; 21. main body; 211. support portion; 22. first cooling pipe; 23. water box body; 231. lower cover plate; 232. side cover plate; 233. first through hole; 234. second through hole. DETAILED DESCRIPTION

[0022] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0023] In the description of the present invention, it should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, it may be internal communication between two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the description of the present invention, it should be understood that the terms "height", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In describing the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being described. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0026] like Figures 1 to 3 As shown, an embodiment of the present invention preferably provides a divertor plasma unit 2 pipe connection structure, which includes a support base 1 and a plasma unit 2; the support base 1 is used to fix the plasma unit 2, and the support base 1 includes a second cooling pipe 11, which is arranged at one end of the support base 1 and extends toward the plasma unit 2; the plasma unit 2 is arranged above the support base 1, and the plasma unit 2 includes a main body 21, a first cooling pipe 22 and a water box body 23, and the first cooling pipe 23 is provided. One end of the cooling pipe 22 is connected to the main body 21, and the other end is connected to the water box body 23. The water box body 23 includes a lower cover plate 231 and a side cover plate 232. A first through hole 233 is provided at the top of the water box body 23 for connecting the first cooling pipe 22. A second through hole 234 is provided at one end of the water box body 23 close to the support base 1 for connecting the second cooling pipe 11. The lower cover plate 231 is provided at one end of the water box body 23 away from the first through hole 233, and the side cover plate 232 is provided at one end of the water box body 23 away from the second through hole 234.

[0027] Based on the above technical features, the support base 1 is provided as the supporting foundation of the entire structure, which is responsible for fixing and supporting the plasma unit 2, which includes a second cooling pipe 11, which extends from one end of the support base 1 and faces the direction of the plasma unit 2 to facilitate the connection of the plasma unit; through the provision of the plasma unit 2, the plasma unit 2 includes a main body 21, a first cooling pipe 22 and a water box body 23, and a decomposed water box body 23 is used in the plasma unit 2. The first through hole 233 on the water box body 23 is welded to the first cooling pipe 22, and the lower cover plate 231 is further welded, and then the plasma unit 2 with the water box body 23 is connected to the support base 1, and the position of the plasma unit 2 is adjusted to make the second through hole 234 on the water box body 23 dock with the second cooling pipe 11 on the support base 1, and the second through hole 234 and the second cooling pipe 11 are welded, and then the side cover plate 232 on the water box body 23 is welded.

[0028] As some embodiments of the present invention, Figure 2 As shown, the main body 21 also includes two support portions 211, which are disposed below the main body 21 and spaced apart along the length of the main body 21. Each support portion 211 is provided with a support hole. By adding two support portions 211 and their respective support holes, the plasma unit 2 further enhances structural stability and installation flexibility while maintaining efficient heat exchange performance. This design makes it more suitable for various plasma applications that require high heat loads.

[0029] As some embodiments of the present invention, Figure 1 As shown, a plurality of fasteners 12 are staggered along the width of the support base 1 at one end of the support base 1, facing away from the plasma unit 2. Each fastener 12 corresponds to a plasma unit 2. The staggered arrangement of fasteners 12 securely connects the plasma unit 2 to the support base 1, further enhancing the stability of the entire structure. Furthermore, the staggered arrangement of fasteners 12 facilitates precise assembly and alignment of the plasma unit 2 and the support base 1.

[0030] As some embodiments of the present invention, Figure 1As shown, each fastener 12 includes two fixing portions 121 spaced apart along the length of the main body 21. The spacing between the two fixing portions 121 is the same as the distance between the two support portions 211. Each fixing portion 121 is provided with a corresponding hole. The arrangement of the fixing portions 121 ensures a tight fit and a secure connection between the fastener 12 and the support portions 211, as the spacing between the two fixing portions 121 is the same as the distance between the two support portions 211. This connection not only provides good mechanical strength but also helps prevent deformation or damage caused by thermal loads and mechanical stress.

[0031] As some embodiments of the present invention, Figure 1 As shown, the fastener 12 also includes a pin 122 that extends through the support hole and the corresponding hole along the width of the main body 21. Pin 122 is used to connect the fixing portion 121 and the support portion 211. The pin 122 is a cylindrical or other shaped metal member with a diameter slightly smaller than the diameter of the support hole and the corresponding hole, allowing it to easily pass through these holes. During installation, the two fixing portions 121 of the fastener 12 are first aligned with the corresponding support portions 211 on the plasma unit 2. Then, the pin 122 is passed through the support hole and the corresponding hole along the width of the main body 21 until it completely penetrates and secures the fixing portion 121 and the support portion 211. By adding the pin 122 and aligning it with the fixing portion 121 and the support portion 211, this fastener 12 structure not only provides a secure connection and enhanced stability, but also simplifies and facilitates assembly and maintenance.

[0032] As some embodiments of the present invention, Figure 3 As shown, the number of the second cooling tubes 11 is multiple, and the multiple second cooling tubes 11 are spaced apart along the width direction of the main body 21, and the horizontal heights of the two adjacent second cooling tubes 11 are not the same. By setting the multiple cooling tubes, since the horizontal heights of the two adjacent second cooling tubes 11 are different, they can more effectively exchange heat with the surrounding environment. This staggered arrangement increases the heat exchange area, allowing heat to be taken away more quickly. At the same time, this staggered arrangement of the second cooling tubes 11 effectively ensures that more plasma units 2 can be installed in a limited space, thereby improving the space utilization of the entire structure.

[0033] As some embodiments of the present invention, Figure 3As shown, the number of plasma units 2 is multiple, and multiple plasma units 2 are spaced apart along the width direction of the support base 1, and the tube length of the first cooling tube 22 in each plasma unit 2 is different, and the horizontal heights of the two adjacent first through holes 233 are all different, and the first through hole 233 and the second cooling tube 11 are arranged in a one-to-one correspondence. By the arrangement of multiple plasma units 2. By the arrangement of multiple plasma units 2, since the first cooling tube 22 in the two adjacent plasma units 2 is different in length, and the horizontal heights of the two adjacent first through holes 233 are also different, this design can more effectively transfer heat from the plasma to the cooling system. By adjusting the length of the first cooling tube 22 and the height of the first through hole 233, each first through hole 233 is made to correspond one-to-one with the staggered second cooling tube 11, further reducing the space utilization rate of this structure. At the same time, the spacing of multiple plasma units 2 and the different lengths of the cooling tubes help to disperse stress and enhance the stability of the entire cooling structure.

[0034] The present invention also provides a welding method for welding the aforementioned plasma unit structure for a divertor, the steps comprising:

[0035] S1. Weld and fix the main body 21 and the first cooling tube 22 in the plasma unit 2. When adjusting the length of the first cooling tube 22, the layout of the second cooling tube 11 needs to be fully considered to ensure the feasibility and reliability of the cooling system.

[0036] S2. Weld the water box body 23 and the first cooling pipe 22 to fix them. After the water box body 23 and the first cooling pipe 22 are fixed, weld the lower cover plate 231 to the water box body 23.

[0037] S3. After the lower cover plate 231 is welded and fixed, the plasma unit 2 is installed on the support base 1. The position of the water box body 23 is adjusted so that the second cooling pipe 11 on the support base 1 is connected to the second through hole 234 on the water box body 23. At the same time, the support portion 211 on the plasma unit 2 is aligned with the fixing portion 121 on the support base 1.

[0038] S4. Insert the pin into the supporting portion 211 and the fixing portion 121, weld the water box body 23 and the second cooling pipe 11 on the front, and weld the side cover 232 to the water box body 23.

[0039] In summary, the embodiment of the present invention provides a divertor plasma unit 2 pipe connection structure and a welding method thereof, which have the following beneficial effects compared with the prior art: 1) the support base 1 serves as the supporting foundation of the entire structure, is responsible for fixing and supporting the plasma unit 2, and includes a second cooling pipe 11, which extends from one end of the support base 1 and faces the direction of the plasma unit 2 so as to be connected to the plasma unit; 2) the plasma unit 2, the plasma unit 2 includes a main body 21, a first cooling pipe 22 and a water box body 23, a decomposed water box body 23 is used in the plasma unit 2, and the first cooling pipe 22 is welded through the first through hole 233 on the water box body 23, and the lower cover plate 231 is further welded, and then the plasma unit 2 with the water box body 23 is connected to the support base 1, and the second through hole 234 on the water box body 23 is connected to the second cooling pipe 11 on the support base 1 by adjusting the position of the plasma unit 2, and the second through hole 234 and the second cooling pipe 11 are welded, and then the side cover plate 232 on the water box body 23 is welded. This solution can effectively solve the welding problem of pipe connections in the narrow space of the divertor of the fusion device, and has the advantages of safety and reliability.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A plasma unit structure for a divertor, characterized in that: including a support base and a plasma unit; The support base is used to fix the plasma unit, and the support base includes a second cooling pipe, which is arranged at one end of the support base and extends toward the plasma unit; The plasma unit is arranged above the support base, and the plasma unit includes a main body, a first cooling pipe and a water box body. One end of the first cooling pipe is connected to the main body, and the other end is connected to the water box body. The water box body includes a lower cover and a side cover. The top of the water box body is provided with a first through hole for connecting the first cooling pipe, and the end of the water box body close to the support base is provided with a second through hole for connecting the second cooling pipe. The lower cover is provided at the end of the water box body away from the first through hole, and the side cover is provided at the end of the water box body away from the second through hole.

2. The plasma unit structure for divertor according to claim 1, characterized in that: The main body further includes two supporting parts, which are arranged below the main body and spaced apart along the length direction of the main body. A supporting hole is formed on each supporting part.

3. The plasma unit structure for a divertor according to claim 2, characterized in that: A plurality of fasteners are staggeredly arranged at one end of the support base away from the plasma unit along the width direction of the support base, and the fasteners are arranged in a one-to-one correspondence with the plasma units.

4. The plasma unit structure for a divertor according to claim 3, characterized in that: Each of the fasteners includes two fixing parts, which are spaced apart along the length direction of the main body, and the spacing distance between the two fixing parts is the same as the distance between the two supporting parts. Each of the fixing parts is provided with a corresponding hole.

5. The plasma unit structure for a divertor according to claim 4, characterized in that: Each of the fasteners further includes a pin member, which passes through the supporting hole and the corresponding hole along the width direction of the main body, and is used to connect the fixing portion and the supporting portion.

6. The plasma unit structure for a divertor according to claim 1, characterized in that: There are multiple second cooling tubes, and the multiple second cooling tubes are spaced apart along the width direction of the main body, and the horizontal heights of two adjacent second cooling tubes are different.

7. The plasma unit structure for a divertor according to claim 1, characterized in that: There are multiple plasma units, and the multiple plasma units are arranged at intervals along the width direction of the support base. The tube body length of the first cooling tube in each plasma unit is different, and the horizontal heights of two adjacent first through holes are different. The first through holes and the second cooling tubes are arranged in a one-to-one correspondence.

8. A welding method, characterized in that: A plasma unit structure for a divertor according to any one of claims 1 to 7 is used, comprising: S1. Welding and fixing the main body and the first cooling tube in the plasma unit; S2. Welding the water box body and the first cooling pipe to fix them. After the water box body and the first cooling pipe are fixed, welding the lower cover plate to the water box body; S3. After the lower cover is welded and fixed, the plasma unit is mounted on the support base. The position of the water box body is adjusted so that the second cooling pipe on the support base is connected to the second through hole on the water box body. At the same time, the support portion on the plasma unit is aligned with the fixed portion on the support base. S4. Insert the pin into the supporting part and the fixing part, weld the water box body and the second cooling pipe on the front side, and weld the side cover plate to the water box body.

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