Divertor target plate structure and processing method thereof

Abstract

The invention relates to the technical field of fusion reaction devices, and discloses a divertor target plate structure and a processing method thereof. Comprising a pipe penetrating assembly and a flat plate assembly. The pipe penetrating assembly comprises a cooling pipe and at least two fixing blocks, the at least two fixing blocks are connected in series and form a first channel, a transition layer is arranged on the inner wall of the first channel, the cooling pipe penetrates through the first channel, the outer wall of the cooling pipe is attached to the transition layer, and a first face is arranged on the periphery of each fixing block. And the first surfaces of the fixed blocks connected in series are matched with each other to form a striking area. The flat plate assembly comprises a top plate, a surrounding plate and a bottom plate which define a second channel, the cooling pipe communicates with the second channel, and a non-striking area is formed on the side, away from the bottom plate, of the top plate. According to the thermal load conditions of different areas of the divertor target plate structure, heat exchange is carried out through the pipe penetrating assembly in the striking area mainly subjected to plasma bombardment, heat exchange is carried out through the flat plate assembly in the non-striking area, the heat exchange efficiency is ensured, and the cost of the divertor target plate structure is reduced.

Description

Technical Field

[0001] This invention relates to the field of fusion reaction device technology, and in particular to a divertor target plate structure and its processing method. Background Technology

[0002] As one of the core internal components of a magnetically confined tokamak fusion device, the divertor's main function is to remove heat and particle flows from the core plasma to ensure the device's normal operation. The target plate is a critical component of the divertor that directly faces the plasma. Its main role is to withstand the high heat and particle loads generated by the core plasma of the fusion device, remove impurities and fusion reaction products, and protect the divertor and subsequent components from damage. The divertor target plate bears the maximum steady-state heat load on the surface of the internal components of the fusion device. In related technologies, divertor target plates typically employ either a tube structure or a flat plate structure. Tube structures generally offer stable performance, high reliability, and can withstand high heat loads; however, their manufacturing process is complex and expensive. Flat plate structures have a simple manufacturing process and are relatively inexpensive, but their performance is unstable, they can withstand lower heat loads, are prone to cracking, and have lower reliability. Therefore, there is a need to design a divertor target plate structure that ensures efficient heat dissipation and stability while maintaining low cost. Summary of the Invention

[0003] The purpose of this invention is to provide a divertor target plate structure that can ensure heat dissipation efficiency and stability while reducing costs.

[0004] To achieve the above objectives, the present invention provides a divertor target plate structure, comprising: A tube-through assembly includes a cooling tube and at least two fixing blocks. Each fixing block has a through hole, and the at least two fixing blocks are connected in series to form a first channel. The inner wall of the first channel has a transition layer. The cooling tube passes through the first channel, and the outer wall of the cooling tube is in contact with the transition layer. Each fixing block has a first surface on its outer periphery. The first surfaces of the series-connected fixing blocks cooperate with each other to form a striking area. A flat plate assembly includes a top plate, a side plate, and a bottom plate. The side plate is connected between the top plate and the bottom plate, and the top plate, the side plate, and the bottom plate enclose a second channel. One end of a cooling pipe extends out of the first channel and is connected to the side plate. The channel inside the cooling pipe communicates with the second channel, so that the channel inside the cooling pipe and the second channel constitute a cooling flow channel. The side of the top plate away from the bottom plate forms a non-impact zone.

[0005] According to one embodiment of the present invention, a connector is connected to one end of the cooling pipe extending outside the first channel. The enclosure includes an end plate, which is disposed at one end of the second channel. The end plate has a connecting hole, and the connector passes through the connecting hole and is welded to the end plate. The connector is made of nickel-based alloy 625, and the end plate is made of austenitic stainless steel.

[0006] According to one embodiment of the present invention, the connection between the cooling pipe and the connector is located within the connection hole.

[0007] According to one embodiment of the present invention, the enclosure includes a side panel extending in the same direction as the second channel, the top of the side panel being connected to the top panel, and at least at one end near the tube assembly, the connection surface between the top of the side panel and the top panel extends along an arc in the direction of extension of the second channel.

[0008] According to one embodiment of the present invention, there are at least two sets of tube-passing assemblies, wherein at least two sets of tube-passing assemblies are connected in parallel at one end of the second channel.

[0009] According to one embodiment of the present invention, a flow collecting cavity is provided at one end of the first channel that is connected to the cooling pipe, and the cross-sectional area of ​​the flow collecting cavity perpendicular to the extension direction of the second channel is greater than the cross-sectional area of ​​the second channel perpendicular to its own extension direction.

[0010] According to one embodiment of the present invention, a first heat exchange groove is provided at the top of the second channel, and the first heat exchange groove extends along the extension direction of the second channel; And / or, the bottom of the second channel is provided with a second heat exchange groove, which extends along the extension direction of the second channel.

[0011] According to one embodiment of the present invention, at least one of the fixing blocks is provided with a first connecting foot on the side opposite to the first surface, the base plate is provided with a second connecting foot, and the second connecting foot is disposed away from the tube assembly.

[0012] The present invention also provides a processing method based on the divertor target plate structure described above, comprising the following steps: At least two of the fixing blocks are connected in series and sleeved on the cooling pipe, and the cooling pipe and the fixing blocks sleeved on the cooling pipe are subjected to hot isostatic pressing treatment. The enclosure and the top plate were subjected to explosive welding. Weld the enclosure plate and the cooling pipe so that the enclosure plate and the top plate cover the outer periphery of the cooling pipe; The bottom plate and the surrounding plate are welded together to form the second channel, thereby obtaining the divertor target plate structure.

[0013] According to one embodiment of the present invention, the processing method further includes the following steps: Electron beam welding connector is applied to one end of the cooling pipe; Argon arc welding is used to connect the connector to the enclosure.

[0014] Compared with the prior art, the divertor target plate structure of this invention has the following advantages: The divertor target plate structure of this invention incorporates a tube-through assembly, on which an impact zone of the divertor target plate structure is formed. A flat plate assembly, through which the tube-through assembly forms a heat exchange path via a fixing block, transition layer, and cooling pipe, accelerates heat exchange and ensures the structural stability of the tube-through assembly. The flat plate assembly forms a non-impact zone of the divertor target plate structure. Thus, based on the heat load of different regions of the divertor target plate structure, heat exchange occurs through the tube-through assembly in the impact zone, which is primarily subjected to plasma bombardment and has a relatively high heat load, while heat exchange occurs through the flat plate assembly in the non-impact zone, which is almost unaffected by plasma bombardment and has a relatively low heat load. This ensures heat exchange efficiency and reduces the cost of the divertor target plate structure. Attached Figure Description

[0015] Figure 1 This is one of the structural schematic diagrams of the divertor target plate structure provided in the embodiments of the present invention.

[0016] Figure 2 This is the second schematic diagram of the divertor target plate structure provided in the embodiment of the present invention.

[0017] Figure 3 This is a partial structural schematic diagram of the divertor target plate structure provided in an embodiment of the present invention.

[0018] Figure 4 This is a top view of a partial structure of the divertor target plate structure provided in an embodiment of the present invention.

[0019] Figure 5 yes Figure 4 A cross-sectional view of the divertor target plate structure at point AA.

[0020] Figure 6 yes Figure 4 A cross-sectional view of the divertor target structure at BB.

[0021] Figure 7 yes Figure 4 A cross-sectional view of the divertor target plate structure at CC.

[0022] Figure 8 yes Figure 4 A cross-sectional view of the divertor target structure at DD.

[0023] Figure 9 This is a schematic flowchart of the processing method for the divertor target plate structure provided in the embodiment of the present invention.

[0024] Figure 10 This is a schematic diagram of the connection between the top plate and the surrounding plate provided in an embodiment of the present invention.

[0025] Figure label: 110. Pipe assembly; 111. Cooling pipe; 112. Connector; 113. Fixing block; 114. Transition layer; 115. First channel; 116. First connecting foot; 120. Flat plate assembly; 121. Top plate; 1211. Tungsten sheet; 1212. Copper sheet; 122. Enclosure plate; 1221. End plate; 1222. Side plate; 1223. Connecting hole; 123. Second channel; 1231. First heat exchange groove; 1232. Second heat exchange groove; 124. Collector cavity; 125. Bottom plate; 126. Second connecting foot; 127. Arc-shaped boundary; 128. Groove structure. Detailed Implementation

[0026] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0027] In the description of the embodiments of the present invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] like Figure 1 and Figure 5 As shown, a divertor target plate structure according to an embodiment of the present invention includes a tube assembly 110 and a plate assembly 120.

[0031] Specifically, the pipe-through assembly 110 includes a cooling pipe 111 and at least two fixing blocks 113. Each fixing block 113 has a through hole, and the at least two fixing blocks 113 are connected in series, forming a first channel 115. A transition layer 114 is provided on the inner wall of the first channel 115. The cooling pipe 111 passes through the first channel 115, and its outer wall is in contact with the transition layer 114. Through the tight contact between the transition layer 114 and both the fixing blocks 113 and the cooling pipe 111, a shorter heat transfer path is formed on the pipe-through assembly 110. Heat can be transferred quickly from the surface of the fixing blocks 113 to the cooling medium inside the cooling pipe 111, thereby suppressing excessive temperature rise in the pipe-through assembly 110 and enabling the pipe-through assembly 110 to withstand a steady-state heat load of 10 MW / m². 2 The fixing block 113 can be made of tungsten or tungsten alloy, and the cooling pipe 111 can be made of chromium zirconium copper. The transition layer 114 can be made of copper, which has good thermal conductivity and is soft. The transition layer 114 can absorb the difference in expansion between the fixing block 113 and the cooling pipe 111 through its own slight deformation, which greatly reduces the risk of cracking caused by thermal fatigue.

[0032] The flat plate assembly 120 includes a top plate 121, a surrounding plate 122, and a bottom plate 125. The surrounding plate 122 connects the top plate 121 and the bottom plate 125, and the top plate 121, surrounding plate 122, and bottom plate 125 enclose a second channel 123. The flat plate assembly 120 mainly requires processing of a plate-like structure, and the processing technology is relatively simple and the cost is low. One end of the cooling pipe 111 extends outside the first channel 115 and connects to the surrounding plate 122. The channel inside the cooling pipe 111 communicates with the second channel 123, so that the channel inside the cooling pipe 111 and the second channel 123 form a cooling flow channel for the cooling medium to flow through. The outer periphery of the fixing block 113 is provided with a first surface, which is used to face the plasma. The first surfaces of the series-connected fixing blocks 113 cooperate with each other to form an impact zone. The side of the top plate 121 facing away from the bottom plate 125 is used to face the plasma and form a non-impact zone. Understandably, during operation, the impact zone is the main area on the divertor target plate structure that directly bears the plasma bombardment, and the heat load and particle flux in the impact zone are higher than those in the non-impact zone. By aligning the first surface of the fixing block 113 of the tube assembly 110 to form the impact zone, the divertor target plate structure mainly exchanges heat through the tube assembly 110, resulting in high heat exchange efficiency. Furthermore, the tube assembly 110 has high structural stability and a long service life. In the non-impact zone, heat exchange occurs through the plate assembly 120. Based on the heat load conditions of different areas of the divertor target plate structure, a structure combining the tube assembly 110 and the plate assembly 120 is adopted, ensuring heat exchange requirements while reducing the cost of the divertor target plate structure.

[0033] According to the divertor target plate structure of the present invention, by providing a through-tube assembly 110, an impact zone of the divertor target plate structure is formed on the through-tube assembly 110. The through-tube assembly 110 forms a heat exchange path through the fixing block 113, the transition layer 114, and the cooling pipe 111, thereby accelerating the heat exchange rate and ensuring the structural stability of the through-tube assembly 110. By providing a plate assembly 120, a non-impact zone of the divertor target plate structure is formed on the plate assembly 120. Using a structure combining the through-tube assembly 110 and the plate assembly 120, heat exchange occurs through the through-tube assembly 110 in the impact zone, which is mainly bombarded by plasma, and through the plate assembly 120 in the non-impact zone, ensuring heat exchange efficiency and reducing the cost of the divertor target plate structure.

[0034] Furthermore, the top surface of the top plate 121 is provided with copper sheets 1212, at least two of which are distributed along the extension direction of the second channel 123. Each copper sheet 1212 has a tungsten sheet 1211 on the side facing away from the top plate 121. During operation, the tungsten sheet 1211 bears the heat load and transfers the heat to the top plate 121 through the copper sheets 1212, and then absorbs the heat through the cooling medium in the second channel 123. In order to improve the heat load bearing capacity, the top plate 121 can be made of chromium zirconium copper material.

[0035] Because the end structures of the through-tube assembly 110 and the flat plate assembly 120 used for interconnection are different—the end of the through-tube assembly 110 is a tubular cooling pipe 111, while the end of the flat plate assembly 120 is a square cross-section formed by the top plate 121, the surrounding plate 122, and the bottom plate 125—the connection structures of the through-tube assembly 110 and the flat plate assembly 120 differ significantly, and the connection involves dissimilar materials, making a stable connection between the through-tube assembly 110 and the flat plate assembly 120 a challenge. Therefore, as follows... Figure 5 and Figure 8 As shown, according to some embodiments of the present invention, a connector 112 is connected to one end of the cooling pipe 111 extending outside the first channel 115. The surrounding plate 122 includes an end plate 1221, which is located at one end of the second channel 123. The end plate 1221 has a connection hole 1223, through which the connector 112 passes and is welded to the end plate 1221. The connector 112 can be made of nickel-based alloy 625 (Inconel 625), and the end plate 1221 is made of austenitic stainless steel. It is understood that the cooling pipe 111 is usually made of chromium-zirconium-copper material. However, in the extreme thermal environment of the fusion reactor, the welded area of ​​the same chromium-zirconium-copper material softens and the connection becomes unstable. During operation, the high temperature generated by plasma bombardment can easily cause the connection between the cooling pipe and the plate assembly 120 to detach. By electron beam welding a connector 112 to one end of the cooling pipe 111 made of chromium-zirconium copper, the connector 112 and the end plate 1221 are made of nickel-based alloy 625 and austenitic stainless steel, respectively, which have good welding performance and mature technology. Furthermore, compared to welding chromium-zirconium copper with the same material, welding chromium-zirconium copper with Inconel 625 and austenitic stainless steel allows the weld joint to withstand more extreme thermal loads and cyclic stresses. The weakest point of the joint is transferred to the base material (chromium-zirconium copper), which is easier to control and inspect, thereby improving the stability of the connection between the pipe assembly 110 and the flat plate assembly 120. Further, as... Figure 5 As shown, the connection between the cooling pipe 111 and the connector 112 can be located inside the connection hole 1223 to reduce the heat load borne by the connection between the cooling pipe 111 and the connector 112.

[0036] According to some embodiments of the present invention, the enclosure 122 includes a side plate 1222, the side plate 1222 extending in the same direction as the second channel 123. For example... Figure 5 and Figure 6As shown, the second channel 123 extends in a left-right direction. The end plate 1221 of the enclosure 122 is located at the left end of the second channel 123 and blocks the second channel 123, separating it from the outside. The enclosure 122 has two side plates 1222, which are located at the front and rear sides of the second channel 123, respectively, forming the front and rear side walls of the second channel 123. The top of the side plate 1222 is connected to the top plate 121, and at least at the end near the pipe assembly 110, the connection surface between the top of the side plate 1222 and the top plate 121 extends along an arc in the extending direction of the second channel 123. Figures 4 to 7 As shown, the top of the side plate 1222 near the end of the tube assembly 110 extends along an arc with radius R, forming a cylindrical curved surface on the top surface of the side plate 1222. The height h1 of the side plate 1222 at BB is less than its height h2 at CC. The bottom of the top plate 121 (the lower side as shown in the figure) connects to the top of the side plate 1222 (the upper side as shown in the figure), and the shape of the bottom of the top plate 121 matches the shape of the top of the side plate 1222, so that when viewed from the front and rear directions, an arc-shaped boundary 127 is formed at the connection between the top plate 121 and the bottom plate 125. In this way, on the one hand, the contact area at the connection between the side plate 1222 and the top plate 121 can be increased, and on the other hand, a smooth transition can be achieved, avoiding stress concentration at the connection between the top plate 121 and the side plate 1222, and ensuring a stable connection. The enclosure 122 can be made of austenitic stainless steel, and the top plate 121 can be made of chromium zirconium copper. The side plates 1222 of the enclosure 122 are welded to the top plate 121 by explosive welding.

[0037] like Figure 1 and Figure 3 As shown, according to some embodiments of the present invention, there are at least two sets of tube-through assemblies 110, wherein at least two sets of tube-through assemblies 110 are connected in parallel at one end of the second channel 123. By providing at least two parallel tube-through assemblies 110, the area of ​​the cooling tubes 111 on the divertor target plate structure is increased, thereby improving the heat transfer rate of the divertor target plate structure. Figure 5 As shown, in some embodiments, the end of the first channel 115 connected to the cooling pipe 111 is provided with a flow collection cavity 124. The cross-sectional area of ​​the flow collection cavity 124 perpendicular to the extension direction of the second channel 123 is larger than the cross-sectional area of ​​the second channel 123 perpendicular to its own extension direction, so as to buffer and stabilize the pressure of the cooling medium and facilitate the connection between the cooling pipe 111 and the enclosure plate 122.

[0038] According to some embodiments of this application, a first heat exchange groove 1231 is provided at the top of the second channel 123 (the upper side as shown in the figure), and the first heat exchange groove 1231 extends along the extending direction of the second channel 123. A second heat exchange groove 1232 is provided at the bottom of the second channel 123 (the lower side as shown in the figure), and the second heat exchange groove 1232 extends along the extending direction of the second channel 123. By providing the first heat exchange groove 1231 and the second heat exchange groove 1232, the contact area between the cooling medium and the inner wall of the second channel 123 is increased, thereby improving the heat exchange rate of the flat plate assembly 120. Figure 6 and Figure 7 As shown, two first heat exchange grooves 1231 can be provided, located at the front and rear sides of the second channel 123 respectively, and the side plates 1222 of the surrounding plate 122 form part of the peripheral wall of the first heat exchange groove 1231; two second heat exchange grooves 1232 can be provided, located at the front and rear sides of the second channel 123 respectively, and the side plates 1222 of the surrounding plate 122 form part of the peripheral wall of the second heat exchange groove 1232. When the top plate 121 is subjected to heat load, the top plate 121, the surrounding plate 122, and the bottom plate 125 can release stress through the first heat exchange channel and the second heat exchange channel to ensure the structural stability of the flat plate assembly 120.

[0039] According to some embodiments of the present invention, at least one fixing block 113 is provided with a first connecting foot 116 on the side opposite to the first surface, and the base plate 125 is provided with a second connecting foot 126, wherein the second connecting foot 126 is disposed away from the tube assembly 110. Specifically, as shown in the figure... Figure 2 and Figure 3 As shown, the upper surface of the fixing block 113 forms a first surface for facing the plasma, and the lower surface of the fixing block 113 is provided with a first connecting foot 116 for connecting with other components of the divertor. The lower surface of the base plate 125 is provided with a second connecting foot 126 for connecting with other components of the divertor. The second connecting foot 126 is welded to the base plate 125 and is positioned away from the tube assembly 110 to avoid stress concentration at the connection between the tube assembly 110 and the plate assembly 120. For example, the distance between the end of the second connecting foot 126 connected to the plate assembly 120 and the tube assembly 110 can be greater than or equal to 30 mm. Furthermore, the first connecting foot 116 can be located on the fixing block 113 away from the plate assembly 120 to further avoid stress concentration at the connection between the tube assembly 110 and the plate assembly 120.

[0040] like Figure 9 As shown, a method for fabricating a divertor target plate structure according to the present invention, the method being based on the divertor target plate structure described above, includes the following steps: At least two fixing blocks 113 are connected in series and sleeved onto the cooling pipe 111, and the cooling pipe 111 and the fixing blocks 113 sleeved onto the cooling pipe 111 are subjected to hot isostatic pressing. Specifically, through holes are machined in the fixing blocks 113, and a transition layer 114 with a thickness of 1 mm to 2 mm is cast inside the through holes for later use. The cooling pipe 111 is formed by cold drawing of chromium zirconium copper material. At least two fixing blocks 113 are connected in series and sleeved onto the cooling pipe 111, and a 0.5 mm thick molybdenum sheet can be sandwiched between two adjacent fixing blocks 113. The cooling pipe 111 with at least two fixing blocks 113 connected in series is placed in a hot isostatic press for hot isostatic pressing, so that the transition layer 114 is tightly fitted with the inner wall of the through hole of the fixing block 113 and the outer wall of the cooling pipe 111. The outer surface of the fixing blocks 113 is precision machined to ensure that its surface roughness and flatness meet the requirements.

[0041] The enclosure plate 122 and the top plate 121 are explosively welded. The enclosure plate 122 is made of austenitic stainless steel, and the top plate 121 is made of chromium zirconium copper. The top of the enclosure plate 122 and the top plate 121 are firmly connected by explosive welding. The end plate 1221 and the side plate 1222 of the enclosure plate 122 and the bottom side of the top plate 121 form a groove structure 128, and the inner surface of the groove structure 128 is precision machined.

[0042] The enclosure plate 122 and the cooling pipe 111 are welded together so that the enclosure plate 122 and the top plate 121 cover the outer periphery of the cooling pipe 111. The cooling pipe 111 is inserted into the end plate 1221 of the enclosure plate 122, and the connection between the cooling pipe 111 and the end plate 1221 is welded from inside the groove structure 128. After welding, the connection between the cooling pipe 111 and the end plate 1221 is precision machined.

[0043] The base plate 125 and the surrounding plate 122 are welded together to form the second channel 123. The bottom of the surrounding plate 122 (the lower side as shown in the figure) is welded to the base plate 125, thereby enclosing the second channel 123. Furthermore, both the surrounding plate 122 and the end plate 1221 are made of austenitic stainless steel, and the surrounding plate 122 and the end plate 1221 are welded together by argon arc welding.

[0044] According to some embodiments of the present invention, the fabrication method of the divertor target plate structure further includes the following steps: Electron beam welding connector 112 is performed at one end of cooling pipe 111. Specifically, the tubular connector 112 supported by austenitic stainless steel is electron beam welded to one end of cooling pipe 111, and the weld is surface-processed.

[0045] Argon arc welding is performed between the connector 112 and the enclosure plate 122. The connector 112 and the connector 112 connected to the cooling pipe 111 are inserted into the connection hole 1223 of the end plate 1221 of the enclosure plate 122. Then, argon arc welding is performed between the connector 112 and the end plate 1221 from one side of the groove structure 128 formed by the enclosure plate 122 and the top plate 121.

[0046] The following is an embodiment of the processing method for the divertor target plate structure of this application: At least two cubic fixing blocks 113 are prepared. A through hole is machined in the center of each fixing block 113 to form a fixing block 113 with an inner circle and an outer square shape. A transition layer 114 with a thickness of 1 mm to 2 mm is cast on the inner wall of the through hole. A chromium-zirconium copper substrate is cold-drawn to form a cooling tube 111. A nickel-based alloy 625 substrate is processed to form a tubular connector 112. The connector 112 is connected to one end of the cooling tube 111 by electron beam welding. At least two fixing blocks 113 are connected in series on the cooling tube 111, and adjacent fixing blocks 113 are separated by a 0.5 mm thick molybdenum sheet. The cooling tube 111, with at least two fixing blocks 113 fitted inside, is placed in a hot isostatic press for extrusion processing. Finally, the surface of the fixing blocks 113 is finished to form a tube assembly 110.

[0047] Austenitic stainless steel substrate and chromium-zirconium-copper substrate are separately processed into plate shapes. The upper side of the austenitic stainless steel substrate is attached to the lower side of the chromium-zirconium-copper substrate, and the two substrates are explosively welded together to obtain a composite structure. One end of the composite structure is then extruded and bent towards the side containing the chromium-zirconium-copper substrate (e.g., ...). Figure 5 (as shown on the upper side), so that an arc-shaped boundary 127 is formed between the austenitic stainless steel substrate and the chromium-zirconium copper substrate. The outer contour of the extruded and bent composite structure is subjected to subtractive processing to make the outer contour of the composite structure flat, and the surface of the composite structure is finished. A downward-facing groove structure 128 is machined on the composite structure, so that the chromium-zirconium copper substrate forms the bottom wall of the groove structure 128 (as shown on the upper side), so that the outer contour of the composite structure is flat, and the surface of the composite structure is finished. Figure 10 The upper sidewall shown in the diagram forms the peripheral wall of the groove structure 128, with the austenitic stainless steel substrate forming the top plate 121 and the austenitic stainless steel substrate forming the surrounding plate 122. A connecting hole 1223 communicating with the groove structure 128 is machined on the end plate 1221 of the surrounding plate 122, and the inner wall of the groove structure 128 is precision machined. This forms a fixedly connected top plate 121 and surrounding plate 122. It should be noted that, to avoid damage to the weld between the austenitic stainless steel substrate and the chromium-zirconium-copper substrate after extrusion bending and to ensure the performance of the weld, the bending radius R of the arc-shaped boundary 127 should satisfy the relationship: 60mm ≤ R ≤ 180mm.

[0048] Prepare a tungsten sheet 1211, and cast a copper sheet 1212 with a thickness of 1 mm on one side surface of the tungsten sheet 1211. Attach one side of the copper sheet 1212 on the tungsten sheet 1211 to the top of the top plate 121 (the upper side as shown in the figure), and braze the tungsten sheet 1211 to the top plate 121.

[0049] Insert the connector 112 of the pipe assembly 110 into the connection hole 1223 on the end plate 1221 of the enclosure 122, and make the connection position of the connector 112 and the cooling pipe 111 located in the connection hole 1223. Argon arc weld the connector 112 to the end plate 1221. After the welding is completed and the weld inspection is qualified, argon arc weld the bottom plate 125 to the bottom of the enclosure 122 (the lower side as shown in the figure) to seal the opening of the groove structure 128. Thus, the top plate 121, the enclosure 122 and the bottom plate 125 cooperate to form the second channel 123. Then, finish the surface of the connection position between the bottom plate 125 and the enclosure 122 to obtain the divertor target plate structure.

[0050] In summary, this embodiment of the invention provides a divertor target plate structure. By setting a tube assembly 110, an impact zone of the divertor target plate structure is formed on the tube assembly 110. By setting a plate assembly 120, the tube assembly 110 forms a heat exchange path through the fixing block 113, the transition layer 114, and the cooling pipe 111, thereby accelerating the heat exchange rate and ensuring the structural stability of the tube assembly 110. By setting the plate assembly 120, a non-impact zone of the divertor target plate structure is formed on the plate assembly 120. Thus, heat exchange occurs through the tube assembly 110 in the impact zone, which is mainly bombarded by plasma, and through the plate assembly 120 in the non-impact zone. This reduces the cost of the divertor target plate structure while ensuring heat exchange efficiency.

[0051] Finally, it should be noted that the above embodiments are only for illustrating the present invention and are not intended to limit the present invention. It should be pointed out that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A divertor target plate structure, characterized in that, include: The tube-through assembly (110) includes a cooling tube (111) and at least two fixing blocks (113). The fixing blocks (113) are provided with through holes. At least two fixing blocks (113) are connected in series so that the through holes of the fixing blocks (113) form a first channel (115). The inner wall of the first channel (115) is provided with a transition layer (114). The cooling tube (111) passes through the first channel (115) and the outer wall of the cooling tube (111) is in contact with the transition layer (114). The outer periphery of the fixing blocks (113) is provided with a first surface. The first surfaces of the series-connected fixing blocks (113) cooperate with each other to form a striking area. A flat plate assembly (120) includes a top plate (121), a surrounding plate (122), and a bottom plate (125). The surrounding plate (122) is connected between the top plate (121) and the bottom plate (125), and the top plate (121), the surrounding plate (122), and the bottom plate (125) enclose a second channel (123). One end of a cooling pipe (111) extends out of the first channel (115) and is connected to the surrounding plate (122). The channel inside the cooling pipe (111) communicates with the second channel (123), so that the channel inside the cooling pipe (111) and the second channel (123) constitute a cooling flow channel. The side of the top plate (121) away from the bottom plate (125) forms a non-impact zone.

2. The divertor target plate structure according to claim 1, characterized in that, The end of the cooling pipe (111) extending outside the first channel (115) is connected to a connector (112). The enclosure plate (122) includes an end plate (1221). The end plate (1221) is located at one end of the second channel (123). The end plate (1221) is provided with a connection hole (1223). The connector (112) passes through the connection hole (1223) and is welded to the end plate (1221). The connector (112) is made of nickel-based alloy 625, and the end plate (1221) is made of austenitic stainless steel.

3. The divertor target plate structure according to claim 2, characterized in that, The connection between the cooling pipe (111) and the connector (112) is located inside the connection hole (1223).

4. The divertor target plate structure according to claim 1, characterized in that, The enclosure (122) includes a side plate (1222) extending in the same direction as the second channel (123). The top of the side plate (1222) is connected to the top plate (121), and at least at one end near the tube assembly, the connection surface between the top of the side plate (1222) and the top plate (121) extends along an arc in the direction of extension of the second channel (123).

5. The divertor target plate structure according to claim 1, characterized in that, The tube assembly (110) is at least two sets, wherein at least two sets of the tube assembly (110) are connected in parallel at one end of the second channel (123).

6. The divertor target plate structure according to claim 5, characterized in that, The first channel (115) is connected to the cooling pipe (111) at one end and is provided with a flow collection cavity (124). The cross-sectional area of ​​the flow collection cavity (124) perpendicular to the extension direction of the second channel (123) is greater than the cross-sectional area of ​​the second channel (123) perpendicular to its own extension direction.

7. The divertor target plate structure according to claim 1, characterized in that, The top of the second channel (123) is provided with a first heat exchange groove (1231), which extends along the extension direction of the second channel (123); And / or, the bottom of the second channel (123) is provided with a second heat exchange groove (1232), which extends along the extension direction of the second channel (123).

8. The divertor target plate structure according to claim 1, characterized in that, At least one of the fixing blocks (113) is provided with a first connecting foot (116) on the side opposite to the first surface, and the base plate (125) is provided with a second connecting foot (126), and the second connecting foot (126) is disposed away from the tube assembly (110).

9. A method for fabricating a divertor target plate structure based on any one of claims 1 to 8, characterized in that, Includes the following steps: At least two of the fixing blocks (113) are connected in series and sleeved on the cooling pipe (111), and the cooling pipe (111) and the fixing blocks (113) sleeved on the cooling pipe (111) are subjected to hot isostatic pressing treatment. The enclosure plate (122) and the top plate (121) are explosively welded. Weld the enclosure plate (122) and the cooling pipe (111) so that the enclosure plate (122) and the top plate (121) cover the outer periphery of the cooling pipe; The bottom plate (125) and the surrounding plate (122) are welded together so that the top plate (121), the surrounding plate (122) and the bottom plate (125) cooperate to form the second channel (123), thus obtaining the divertor target plate structure.

10. The method for processing the divertor target plate structure according to claim 9, characterized in that, It also includes the following steps: Electron beam welding connector (112) is applied to one end of the cooling pipe (111); Argon arc welding is performed on the connector (112) and the enclosure (122).

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