Central tube and fusion equipment

Abstract

The invention discloses a central tube and fusion equipment. The central tube comprises a tube body, the tube body comprises a wall part defining a containing cavity, and the side, deviating from the containing cavity, of the wall part is concaved towards the interior of the containing cavity in the radial direction to form a concave part; and the cooling plate is arranged in the concave part, and a cooling channel is defined by the cooling plate and the concave part. According to the embodiment of the invention, the cooling channel is defined by the concave part and the cooling plate, the cooling plate is arranged at the concave part, the structural strength of the pipe body is improved, the liquid cooling medium flows through the cooling channel to cool the protection assembly arranged on the periphery of the central pipe, and the cooling effect is good. The central pipe is compact in overall structure, small in occupied space, high in structural strength and capable of effectively cooling the protection assembly on the periphery of the central pipe.

Description

Technical Field

[0001] The present application belongs to the technical field of fusion equipment, and in particular, relates to a central tube and a fusion equipment. Background Art

[0002] The vacuum chamber of the fusion device is located inside the magnet system and is the core component of the fusion device. The central tube in the vacuum chamber cools the protective tiles or limiters to reduce the probability of ablation of the protective tiles or limiters when the plasma is running. The central tube also provides support for the protective tiles or limiters, and also provides sufficient structural space for the ohmic coils outside the vacuum chamber and the internal plasma.

[0003] Usually, the central tube occupies a small space, has low structural strength and poor cooling effect. Therefore, how to reduce the space occupied by the central tube while improving its strength and cooling effect has become one of the technical problems that need to be urgently solved in the field of fusion equipment technology. Summary of the invention

[0004] The embodiments of the present application provide a central tube and a fusion device. The central tube occupies a small space, has a high structural strength, and has a good cooling effect on the high-temperature protection components arranged on the periphery thereof.

[0005] In a first aspect, an embodiment of the present application provides a central tube, the central tube comprising: a tube body, the tube body comprising a wall portion enclosing a receiving cavity, the wall portion being recessed radially into the receiving cavity from a side away from the receiving cavity to form a recess;

[0006] The cooling plate is arranged in the concave portion and encloses the concave portion to form a cooling channel.

[0007] According to an embodiment of the first aspect of the present application, the tube body extends along a first direction, the cooling channel extends along a straight track in the first direction, and the first direction intersects with the radial direction.

[0008] According to an embodiment of the first aspect of the present application, the tube body extends along a first direction, and the cooling channel is spirally arranged with the first direction as an axial direction, and the first direction intersects with the radial direction.

[0009] According to an embodiment of the first aspect of the present application, the tube body extends along a first direction, the first direction is arranged to intersect with the radial direction, the cooling channel includes a plurality of annular channels formed along the circumference of the tube body, the plurality of annular channels are arranged at intervals along the first direction, and every two adjacent annular channels are connected by a connecting channel.

[0010] According to an embodiment of the first aspect of the present application, the cooling plate and the tube body are an integrated structure.

[0011] According to an embodiment of the first aspect of the present application, a plurality of cooling channels are provided, and the plurality of cooling channels are evenly spaced and distributed along the circumference of the tube body.

[0012] According to an embodiment of the first aspect of the present application, the central tube further includes a mounting portion, and a mounting portion is provided between every two adjacent cooling channels; the wall portion has a radially opposite outer circumferential surface and an inner circumferential surface, and the mounting portion is connected to the outer circumferential surface.

[0013] According to an embodiment of the first aspect of the present application, the mounting portion and the tube body are an integral structure.

[0014] According to an embodiment of the first aspect of the present application, a plurality of mounting portions are provided, and the plurality of mounting portions are spaced apart and distributed along the first direction.

[0015] According to an embodiment of the first aspect of the present application, the cooling plate has relative inner and outer walls in the radial direction, and the inner wall partially protrudes radially toward the recess to form a convex portion; the radial orthographic projection area of ​​the convex portion is smaller than the radial orthographic projection area of ​​the recess and the radial orthographic projection of the convex portion overlaps with the radial orthographic projection of part of the recess; a mounting hole is radially arranged on the cooling plate, and the mounting hole extends from the convex portion to the outer wall.

[0016] According to an embodiment of the first aspect of the present application, a plurality of protrusions are provided, and the plurality of protrusions are spaced apart along the first direction, and each protrusion is arranged corresponding to at least one mounting hole, and the first direction and the radial direction are intersected.

[0017] In a second aspect, an embodiment of the present application provides a fusion device, which includes a central tube provided in the embodiment of the first aspect of the present application and a protective component arranged outside the central tube, wherein the central tube is used to cool the protective component arranged outside it.

[0018] According to an embodiment of the second aspect of the present application, the protection component includes at least one of a protection tile and a limiter.

[0019] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0020] The central tube and fusion equipment provided in the embodiments of the present application, the central tube includes a tube body and a cooling plate. The tube body includes a wall portion enclosing a receiving cavity, the wall portion is radially recessed into the receiving cavity from the side away from the receiving cavity to form a recess, the recess and the cooling plate enclose a cooling channel, and the cooling plate is provided at the recess to increase the structural strength of the tube body, and a liquid cooling medium flows through the cooling channel to cool the protective components arranged on the periphery of the central tube, and the cooling effect is good. The overall structure of the central tube is compact, occupies a small space, has a high structural strength, and can effectively cool the protective components on its periphery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 A schematic diagram of the structure of a central tube provided in some embodiments of the present application;

[0023] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0024] Figure 3 A front view of a central tube provided for some embodiments of the present application;

[0025] Figure 4 for Figure 3 Cross-section of the middle BB;

[0026] Figure 5 for Figure 4 A partial enlarged view of point C in the middle.

[0027] Description of Figure Numbers:

[0028] 1. Pipe body; 11. Wall; 111. Outer peripheral surface; 112. Inner peripheral surface; 12. Recessed portion;

[0029] 2. cooling plate; 21. outer wall; 22. inner wall; 23. convex part; 24. mounting hole;

[0030] 3. Cooling channel; 4. Installation part;

[0031] X, first direction. DETAILED DESCRIPTION

[0032] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0034] The vacuum chamber of the fusion device is located inside the magnet system. It contains plasma by supporting internal components and is the core component of the fusion device. The central tube of the vacuum chamber cools the protective tiles or limiters. The limiter is a device installed outside the central tube of the vacuum chamber of the nuclear fusion device. It is a component used to limit the plasma boundary and mainly protect its internal components.

[0035] The central tube of the vacuum chamber needs to support the protective tiles or limiters, and magnetic measuring parts need to be installed on the outer surface of the central tube, which requires the central tube to have sufficient structural strength; in addition, the ohmic coil outside the vacuum chamber and the internal plasma need sufficient working space, which requires the central tube to occupy a relatively small space. The inventor found that in the related art, the central tube of the vacuum chamber is divided into a single-layer structure and a double-layer structure. The central tube wall of the single-layer structure is thin and has no cooling channel, resulting in poor cooling effect on the peripheral protective tiles or limiters; while the central tube wall of the double-layer structure is thick and occupies a large space, and both cannot fully meet the working requirements of the fusion equipment.

[0036] In view of this, the embodiment of the present application provides a central tube and a fusion device. The central tube provided in the embodiment of the present application is first introduced below, and the central tube supports and cools the protective components (at least one of the protective tiles and the limiter) arranged on its periphery as an example.

[0037] Figure 1 A schematic diagram of the structure of a central tube provided in some embodiments of the present application; Figure 2 for Figure 1 A partial enlarged view of the middle A; Figure 3 A front view of a central tube provided for some embodiments of the present application; Figure 4 for Figure 3 Cross-section of the middle BB; Figure 5 for Figure 4 A partial enlarged view of point C in the middle.

[0038] The central tube provided in the embodiment of the present application is as follows Figures 1 to 5 As shown, the central tube includes a tube body 1 and a cooling plate 2. The tube body 1 includes a wall portion 11 enclosing a receiving cavity, the wall portion 11 is recessed radially into the receiving cavity from a side away from the receiving cavity to form a recess 12, and the cooling plate 2 is arranged in the recess 12 and encloses the recess 12 to form a cooling channel 3.

[0039] The tube body 1 extends along a first direction X, and a shape of an orthographic projection of the tube body 1 in the first direction X may include one of a circle, an ellipse, and a polygon.

[0040] The cooling plate 2 comprises a regular or irregular plate-shaped structure with thickness and length, which is load-bearing and strong. Exemplarily, the cooling plate 2 comprises an arc-shaped metal plate with good thermal conductivity.

[0041] Exemplarily, the first direction X is arranged to intersect the radial direction perpendicularly.

[0042] Exemplarily, a portion of the wall portion 11 is recessed radially into the accommodating cavity from a side away from the accommodating cavity to form a recess 12 .

[0043] The wall portion 11 is recessed radially into the accommodating cavity from one side away from the accommodating cavity to form a recess 12, and the recess 12 and the cooling plate 2 are enclosed to form a cooling channel 3, and the cooling plate 2 is provided at the recess 12 to increase the structural strength of the tube body 1, and the liquid cooling medium flows through the cooling channel 3 to cool the protective components arranged on the periphery of the central tube, and the cooling effect is good. The overall structure of the central tube is compact, occupies a small space, has a high structural strength, and can effectively cool the protective components on its periphery.

[0044] In some embodiments, the first direction X is arranged to intersect with the radial direction, and the extension direction of the cooling channel 3 includes but is not limited to the following three implementations: first, the cooling channel 3 extends along a straight trajectory in the first direction X; second, the cooling channel 3 is arranged in a spiral shape with the first direction X as the axial direction; third, the cooling channel 3 includes a plurality of annular channels formed along the circumference of the tube body 1, and the plurality of annular channels are arranged at intervals along the first direction X, and every two adjacent annular channels are connected by a connecting channel.

[0045] The cooling channel 3 extends along a straight track in the first direction X, the concave portion of the tube body is arranged to penetrate along the first direction X, and the liquid cooling medium flows through the cooling channel 3 and flows along a straight track in the first direction X. The central tube of the cooling channel 3 extending along the straight track is easy to process and form. A plurality of cooling channels 3 can be provided, and the plurality of cooling channels 3 are distributed at intervals along the circumference of the tube body 1.

[0046] With the first direction X as the axis, the cooling channel 3 is arranged in a spiral shape (not shown in the figure). There can be multiple cooling channels 3, and the liquid cooling medium flows through the cooling channel 3 and flows around the tube body in a spiral shape to cool the protective components outside the tube body. The central tube with the first direction X as the axial cooling channel 3 arranged in a spiral shape cools the protective components on its periphery evenly, and the cooling medium in the cooling channel 3 flows quickly, and the cooling speed is faster and the cooling effect is better.

[0047] The cooling channel 3 includes a plurality of annular channels (not shown) formed along the circumference of the tube body 1, and the plurality of annular channels are arranged at intervals along the first direction X, and at least one connecting channel is provided between every two adjacent annular channels. Exemplarily, the connecting channel extends along the first direction X, and every two adjacent annular channels are connected through the connecting channel, and the cooling medium in the cooling channel 3 flows fast and evenly, and the cooling is more even and fast.

[0048] In some optional embodiments, the cooling plate 2 and the tube body 1 can be connected by an integrated structure, welding, etc. The cooling plate 2 and the recess 12 enclose a cooling channel 3 with a connecting cavity, and the two sides of the cooling plate 2 are respectively connected to the two inner walls of the recess. The cooling plate 2 and the inner wall of the recess 12 enclose a cooling channel 3, and the cooling channel 3 is used for the circulation of the cooling medium. Furthermore, the cooling plate 2 and the tube body 1 can be formed into an integrated structure by casting, injection molding, etc. The central tube of the integrated structure has high structural strength, simpler processing and lower cost.

[0049] In some optional embodiments, a plurality of cooling channels 3 are provided, and the plurality of cooling channels 3 are evenly spaced along the circumference of the tube body 1. The evenly spaced distribution of the plurality of cooling channels 3 along the circumference of the tube body 1 can make the tube body 1 cool its peripheral high-temperature protection components more evenly, and when a single cooling channel 3 fails, the tube body 1 can still cool its peripheral high-temperature protection components through other cooling channels 3, thereby improving the cooling efficiency and extending the service life of the central tube. Preferably, the cooling channels 3 are provided in 6, 8, 10, 12, 14 or 16 numbers, and an even number of cooling channels 3 is more convenient for positioning the protection components during installation.

[0050] In addition, the cooling plate 2 is arranged in the recess 12 and enclosed with the recess 12 to form a cooling channel 3. The multiple cooling channels 3 are evenly spaced along the circumference of the tube body 1, that is, the multiple cooling plates 2 are evenly spaced along the circumference of the tube body 1, which increases the structural strength of the central tube. The central tube is a single-layer thin-wall structure. The cooling plate 2 is arranged in the recess 12 without increasing the thickness of the central tube, so as to ensure smaller eddy currents inside the vacuum chamber, increase the resistance of the vacuum chamber, and provide strong experimental conditions for physical experiments in fusion equipment.

[0051] The central tube not only supports and cools the peripheral protective components (at least one of the protective tiles and the limiter), but also needs to install magnetic measuring parts and other components on the outer peripheral surface 111 of the central tube. In some achievable embodiments of the present application, the central tube also includes a mounting portion 4, and a mounting portion 4 is provided between every two adjacent cooling channels 3. The wall portion 11 has a radially opposite outer peripheral surface 111 and an inner peripheral surface 112, and the mounting portion 4 is connected to the outer peripheral surface 111. The mounting portion 4 is used to install components such as magnetic measuring parts.

[0052] Exemplarily, the mounting portion 4 and the tube body 1 are an integrated structure, and the specific implementation process includes but is not limited to casting, injection molding, etc. The mounting portion 4 is integrally formed with the tube body 1, which reduces the welding workload and the need to repeatedly position it during welding, and avoids deformation of the central tube caused by welding.

[0053] The mounting portion 4 may include a regular or irregular plate-like structure with thickness, load-bearing and strength. The radial projection shape of the mounting portion 4 includes at least one of a circle, an ellipse and a polygon. The mounting portion 4 may be used as a mounting seat for components such as a magnetic measuring device, and the connection methods of the mounting portion 4 and the components such as a magnetic measuring device include but are not limited to connection methods such as clamping, threaded connection, bonding, welding, and fastener connection.

[0054] In some achievable embodiments of the present application, there are multiple mounting parts 4, and the multiple mounting parts 4 are spaced apart along the first direction X. The structural shape and specific arrangement of the mounting parts 4 can be set according to specific installation requirements. There can also be multiple mounting parts 4 provided between every two adjacent cooling channels 3 on the same latitude of the tube body, and the multiple mounting parts 4 are arranged in parallel along the circumference of the tube body.

[0055] The central tube and its peripheral protective components (at least one of the protective tiles and the limiter) can be directly connected or indirectly connected. The central tube and its peripheral protective components (at least one of the protective tiles and the limiter) can be connected through a heat-conducting component, which includes but is not limited to a metal connector, and the metal connector includes a metal heat-conducting block with good thermal conductivity. When the central tube and its peripheral protective components (at least one of the protective tiles and the limiter) are directly connected, in some achievable embodiments of the present application, the cooling plate 2 has a radially opposite inner wall 22 and an outer wall 21, and the inner wall 22 partially protrudes radially toward the recess 12 to form a convex portion 23. The radial orthographic projection area of ​​the convex portion 23 is smaller than the radial orthographic projection area of ​​the recess 12, and the radial orthographic projection of the convex portion 23 overlaps with the radial orthographic projection of part of the recess 12. That is, the cross-sectional area of ​​the convex portion 23 is smaller than the cross-sectional area of ​​the recess 12, and a mounting hole 24 is radially provided on the cooling plate 2, and the mounting hole 24 extends from the convex portion 23 to the outer wall 21. The protrusion 23 is located in the cooling channel 3 .

[0056] Specifically, the protection assembly is connected to the cooling plate 2 by inserting a fastener into the mounting hole 24. The mounting hole 24 is a blind hole to prevent the cooling medium in the cooling channel 3 from flowing out through the mounting hole on the protrusion. The inner wall 22 of the cooling plate 2 partially protrudes radially toward the recess 12 to form a convex portion 23, and the convex portion 23 occupies part of the space of the recess 12. The cooling plate 2 is provided with a convex portion 23, and the mounting hole 24 is extended from the convex portion 23 to the outer wall 21 to increase the radial length of the mounting hole 24, so that the connection strength of the cooling plate 2 and the protective component can be increased when the fastener connects the cooling plate 2 and the protective component. The accommodating space of the recess 12 is utilized to ensure that the connection strength between the cooling plate 2 and the protective component is sufficiently high, and the protective component can also be fitted with the outer wall 21 of the cooling plate 2. The outer wall 21 of the cooling plate 2 is fitted to achieve direct contact between the cooling plate and the protective component. The heat on the protective component can be efficiently and quickly transferred directly to the central tube for dissipation, thereby improving the heat exchange efficiency and enhancing the cooling effect of the central tube on the protective component, thereby preventing the protective tile (or limiter) from absorbing the heat load and failing to dissipate the heat in time, causing the coating to fall off.

[0057] In the related art, a connecting component for connecting the protective component needs to be provided on the outer circumferential surface 111 of the center tube. Usually, the connecting component includes a connecting block. The connecting block is welded on the outer circumferential surface 111 of the center tube, and the connecting block is embedded in the protective tile. As a result, the protective tile needs to be specially processed according to the position of the mounting block during processing. The technical solution provided in the embodiment of the present application can reduce the processing difficulty of the protective component. The center tube provided in the embodiment of the present application has a wide range of applications and improves the interchangeability of the protective component.

[0058] In the embodiment provided in the present application, a plurality of protrusions 23 are provided, and the plurality of protrusions 23 are spaced apart along the first direction X. Each protrusion 23 is arranged corresponding to at least one mounting hole 24, and the first direction X and the radial direction intersect each other.

[0059] The plurality of protrusions 23 are spaced apart along the first direction X, and each protrusion 23 is provided corresponding to at least one mounting hole 24, so that the connection between the protection component and the central tube is more uniform and stable, and is not easily deformed by force. Each protrusion 23 may be provided with a plurality of mounting holes to enhance the connection strength between the cooling plate 2 and the protection component.

[0060] The mounting hole 24 includes but is not limited to at least one of a threaded hole and a smooth hole. When the mounting hole 24 is a threaded hole, the fastener includes a screw, a rivet or a bolt that matches the mounting hole. Through the cooperation of the fastener and the mounting hole, not only can the connection reliability and stability between the protection component and the central tube be achieved, but also the protection component and the central tube can be easily disassembled, thereby improving the interchangeability of the protection component. When the mounting hole 24 is a smooth hole, the fastener may include a pin that matches the mounting hole 24. Through the cooperation of the fastener and the mounting hole 24, a reliable and stable detachable connection between the protection component and the central tube can be achieved.

[0061] In the related art, the center tube structure of the vacuum chamber is usually a straight tube structure, and the protection assembly (center column protection tile or limiter) and the magnetic measuring part are connected to the center tube through a connecting assembly. The connecting assembly is usually welded to the outer peripheral surface of the center tube, the welding adjustment cycle is long, and the axial and circumferential positioning accuracy is poor. In the center tube provided in the embodiment of the present application, the protection assembly and the cooling plate 2 are connected by inserting the fasteners into the mounting holes 24, and the magnetic measuring part is connected to the center tube through the mounting part, which improves the installation efficiency of the magnetic measuring part and the protection assembly and the center tube, and the mounting part and the cooling plate and the tube body can adopt an integrated structure, which reduces the welding workload and repeated positioning, avoids the deformation of the center tube caused by welding, and is easy to process.

[0062] Reference Figures 1 to 5 The embodiment of the present application provides a central tube, which includes a tube body 1 and a cooling plate 2. The tube body 1 includes a wall portion 11 enclosing a receiving cavity, the wall portion 11 is recessed radially into the receiving cavity from a side away from the receiving cavity to form a recess 12, and the cooling plate 2 is arranged in the recess 12 and encloses the recess 12 to form a cooling channel 3. The tube body 1 extends along a first direction X, the first direction X is arranged to intersect the radial direction perpendicularly, the cooling channel 3 extends along a straight track in the first direction X, and a plurality of cooling channels 3 are provided, and the plurality of cooling channels 3 are evenly spaced along the circumference of the tube body 1. The cooling plate 2 and the tube body 1 are an integrated structure. A mounting portion 4 is provided between every two adjacent cooling channels 3. The cooling plate 2 has an inner wall 22 and an outer wall 21 opposite to each other in the radial direction, and the inner wall 22 partially protrudes radially toward the recess 12 to form a convex portion 23. A mounting hole 24 is provided radially on the cooling plate 2, and the protection component and the cooling plate 2 are connected by inserting a fastener into the mounting hole 24.

[0063] Another embodiment of the present application provides a fusion device, including the above-mentioned central tube and a protection component, the protection component is arranged on the periphery of the central tube, the central tube is used to cool the protection component arranged on the periphery thereof, the protection component includes at least one of a protection tile and a limiter, and a plurality of limiters or protection tiles may be provided, and a plurality of limiters (protection tiles) are distributed at intervals along the circumference of the central tube. The specific connection method between the protection component and the central tube is detailed in the above-mentioned related content, which will not be repeated here.

[0064] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0065] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A central tube, characterized in that: The central tube comprises: A tube body, the tube body comprising a wall portion enclosing a receiving cavity, the wall portion being recessed radially into the receiving cavity from a side away from the receiving cavity to form a recess; A cooling plate is disposed in the recess and enclosed with the recess to form a cooling channel.

2. The central tube according to claim 1, characterized in that The tube body extends along a first direction, the cooling channel extends along a straight track in the first direction, and the first direction intersects with the radial direction.

3. The central tube according to claim 1, characterized in that The tube body extends along a first direction, the cooling channel is spirally arranged around the first direction as an axial direction, and the first direction intersects with the radial direction.

4. The central tube according to claim 1, characterized in that The tube body extends along a first direction, and the first direction intersects with the radial direction. The cooling channel includes a plurality of annular channels formed along the circumference of the tube body. The plurality of annular channels are spaced apart along the first direction, and every two adjacent annular channels are connected by a connecting channel.

5. The central tube according to any one of claims 1 to 4, characterized in that: The cooling plate and the tube body are an integrated structure.

6. The central tube according to claim 2, characterized in that There are a plurality of cooling channels, and the plurality of cooling channels are evenly spaced and distributed along the circumference of the tube body.

7. The central tube according to claim 6, characterized in that The central tube further comprises a mounting portion, wherein the mounting portion is provided between every two adjacent cooling channels; The wall portion has an outer peripheral surface and an inner peripheral surface that are opposite to each other in the radial direction, and the mounting portion is connected to the outer peripheral surface.

8. The central tube according to claim 7, characterized in that The mounting portion and the tube body are an integrated structure.

9. The central tube according to claim 7 or 8, characterized in that: There are a plurality of the mounting portions, and the plurality of the mounting portions are spaced apart and distributed along the first direction.

10. The central tube according to claim 1, characterized in that The cooling plate has an inner wall and an outer wall opposite to each other in the radial direction, and a part of the inner wall protrudes toward the concave part in the radial direction to form a convex part; The orthographic projection area of ​​the convex portion in the radial direction is smaller than the orthographic projection area of ​​the concave portion in the radial direction, and the orthographic projection of the convex portion in the radial direction overlaps with the orthographic projection of a part of the concave portion in the radial direction; A mounting hole is radially arranged on the cooling plate, and the mounting hole extends from the convex portion to the outer wall.

11. The central tube according to claim 10, characterized in that There are a plurality of protrusions, which are spaced apart along a first direction, each of which is arranged corresponding to at least one mounting hole, and the first direction and the radial direction are arranged to intersect.

12. A fusion device, characterized in that: include: The central tube according to any one of claims 1 to 11; The protection component is arranged on the outer peripheral surface of the central tube.

13. The fusion device according to claim 12, characterized in that The protection component includes at least one of a protection tile and a limiter.

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