Apparatus and method for manufacturing tungsten copper string for nuclear fusion tungsten divertor

Abstract

A fixing device and method for manufacturing a tungsten-copper string of a nuclear fusion tungsten divertor. The tungsten-copper string comprises a plurality of stacked tungsten-copper blocks and a metal pipe arranged through the center of the tungsten-copper blocks; the tooling comprises an assembled closed shell and a plurality of split fixing blocks arranged in the assembled closed shell, the split fixing blocks being used to compress the tungsten-copper blocks in the circumferential direction; the assembled closed shell is provided with a vacuum extraction receiving portion communicating with an internal sealed space and a first through hole through which the metal pipe is sealed out. The tooling structure is simple, easy to install and disassemble, and can be used to conveniently manufacture a tungsten-copper string with a high-quality welding interface, thereby reducing the damage probability of the nuclear fusion device divertor.

Description

TECHNICAL FIELD

[0001] The application relates to a device and a method for processing and manufacturing a tungsten-copper string of a full-tungsten divertor of a nuclear fusion device, in particular to a device and a method for processing and manufacturing a tungsten-copper string of a nuclear fusion tungsten divertor, and belongs to the technical field of magnetic confinement fusion. BACKGROUND

[0002] At present, the divertor is one of the core components of a nuclear fusion device. High-energy particles from the core deposit huge energy on the divertor. The divertor must timely remove these impurity particles and energy to play an important role in protecting the device and maintaining high-quality plasma. Therefore, the divertor plays a decisive role in the operation of the entire nuclear fusion device. The full-tungsten divertor refers to the core unit of the divertor, which uses tungsten as the material directly facing the plasma.

[0003] At present, famous nuclear fusion devices in the world, such as EAST in China, ITER in the world, and JET in Europe, all use full-tungsten divertors. The core unit of the divertor is a tungsten-copper string similar to a "candy gourd string". The tungsten-copper string is formed by penetrating a plurality of tungsten-copper blocks into a metal pipe and then welding the tungsten-copper blocks and the metal pipe by a special technical method. The known existing manufacturing method of the tungsten-copper string is as follows: first, a circular array of through holes is formed on a qualified tungsten plate, a 1mm oxygen-free copper transition layer is cast on the inner wall of the through hole by a casting process, and then a plurality of tungsten-copper blocks with outer square and inner circle are processed; then, the plurality of tungsten-copper blocks are connected into a string through a chromium-zirconium-copper pipe, and the connection between the tungsten-copper blocks and the chromium-zirconium-copper pipe is realized by hot isostatic pressing technology, and finally a tungsten-copper string part with two layer bonding surfaces (tungsten / oxygen-free copper, oxygen-free copper / chromium-zirconium-copper) is manufactured.

[0004] Although the metal pipe is filled with cooling liquid to carry away the heat absorbed on the surface of the tungsten-copper block during use, the heat flux density on the surface of the tungsten-copper block usually still reaches 10mW / m 2 The quality (such as bonding strength, fatigue strength, etc.) of the welding interface between the tungsten-copper block and the metal pipe of the tungsten-copper string prepared based on the above-mentioned prior art is often difficult to cope with the thermal stress caused by high temperature generated by such high heat flux density, resulting in damage to the welding interface between the tungsten-copper block and the metal pipe, which becomes a frequently damaged part of the nuclear fusion device divertor.

[0005] The manufacturing difficulty of the divertor is extremely great, and the core unit of the divertor, i.e. the tungsten-copper string, is the most core component of the entire divertor, and the processing and manufacturing of the tungsten-copper string is the most important part of the entire divertor manufacturing. Therefore, it is urgent to research and develop a processing and manufacturing technology and method of the core unit of the full-tungsten divertor with a high-quality welding interface. SUMMARY

[0006] In order to overcome the above-mentioned deficiencies of the related art, the present application provides a fixing device and method for manufacturing a tungsten-copper string of a tungsten divertor of nuclear fusion, which has a simple structure, is easy to install and disassemble, and can process the tungsten-copper string with a high-quality welding interface by using the fixing device structure, thereby reducing the damage probability of the divertor of the nuclear fusion device.

[0007] A technical solution adopted by the present application to solve its technical problems is:

[0008] A fixing device for manufacturing a tungsten-copper string of a tungsten divertor of nuclear fusion, the tungsten-copper string comprising a plurality of tungsten-copper blocks stacked and a metal pipe penetrating through the center of the tungsten-copper blocks; the fixing device comprising an assembled closed shell and a plurality of split fixing blocks arranged in the assembled closed shell, the split fixing blocks being used to compress the tungsten-copper blocks from the circumference; the assembled closed shell being provided with a vacuum extraction receiving part communicating with an internal sealed space and a first through hole for the metal pipe to pass through.

[0009] Optionally, the assembled closed shell comprises a shell body with at least one open end, the shell body being provided with a closable end cover at the port, and the first through hole being formed on the end cover and the end part of the shell body arranged opposite to the end cover.

[0010] Optionally, the split fixing block comprises at least one pair of split fixing blocks wrapped around the outer periphery of the tungsten-copper block, the pair of split fixing blocks being formed by at least two fixing block monomers annularly spliced together.

[0011] The outer part of the entire split fixing block is consistent with the shape of the inner surface of the shell body, and the inner part is split into a chamber matching the shape of the tungsten-copper block, and the chamber is provided with a second through hole for the metal pipe at both ends.

[0012] Optionally, the split fixing block comprises three pairs of split fixing blocks, namely one middle split fixing block and two end split fixing blocks; the middle split fixing block and the end split fixing block each comprise two symmetrically split fixing block monomers; the middle split fixing block is provided with a through channel for abutting against the side wall of the tungsten-copper string, and the end split fixing block is arranged at both ends of the tungsten-copper string and is provided with a second through hole in the middle.

[0013] Optionally, a plurality of through grooves along the length of the tungsten-copper string are symmetrically arranged in the chamber for fixedly connecting the tungsten-copper string and the split fixing block, and one through groove is arranged on each fixing block monomer.

[0014] Optionally, a soft high-temperature-resistant buffer layer is arranged between the split fixing block and the tungsten-copper block.

[0015] Optionally, the soft high-temperature-resistant buffer layer is made of graphite paper material resistant to high temperature above 700 degrees, and the thickness of the graphite paper is 0.1-2 mm.

[0016] Optionally, the vacuum suction part comprises a suction pipe fixedly arranged on the assembled closed shell, and a sealing plug or a sealing cover plate is arranged at a port of the suction pipe.

[0017] The fixing device for manufacturing the tungsten-copper string of the tungsten divertor of nuclear fusion has the advantages of simple structure, easy installation and disassembly, pre-tightening and sealing fixation of the pre-assembled tungsten-copper string, and convenient subsequent heat treatment operation, and forms a new processing mode to meet the requirement of high-quality welding surface.

[0018] Another technical solution adopted by the present application to solve the technical problem is:

[0019] A method for manufacturing a tungsten-copper string of a tungsten divertor of nuclear fusion comprises the following operation steps:

[0020] 1) preparing tungsten-copper blocks of the tungsten-copper string;

[0021] 2) preparing metal pipes of the tungsten-copper string;

[0022] 3) pre-assembling the tungsten-copper string;

[0023] 4) preparing a fixing device for manufacturing the tungsten-copper string of the tungsten divertor of nuclear fusion;

[0024] 5) installing the pre-assembled tungsten-copper string in step 3) into the fixing device in step 4), pre-tightening, vacuumizing and sealing fixing, as a test piece after assembly;

[0025] 6) placing the test piece into a vacuum furnace, setting the temperature in the furnace from normal temperature to 300-800 degrees, then keeping the temperature for 1-10 hours, and then cooling to normal temperature with the furnace; at the same time, setting the pressure in the furnace from normal pressure to 50-150 MPa, then keeping the pressure for 1-10 hours, and then reducing to normal pressure;

[0026] 7) after the above work is completed, taking out the test piece from the vacuum furnace, breaking the fixing device, and then taking out the tungsten-copper string.

[0027] Optionally, the step 5) specifically comprises:

[0028] S1, installing the pre-assembled tungsten-copper string into the split fixing block, and arranging a soft high-temperature-resistant buffer layer between the two; pre-tightening the split fixing block, the pre-tightening force being 1000N-10000N, then keeping the pre-tightening force unchanged, and fixing at the interface of each set of split fixing blocks by spot welding to obtain a first combination of the tungsten-copper string and the split fixing block;

[0029] S2, placing the first combination into the assembled closed shell, installing a soft high-temperature-resistant buffer layer between the combination and the assembled closed shell, and then welding and sealing the assembled closed shell to obtain a second combination;

[0030] S3, performing air extraction on the inside of the assembled closed shell through the vacuum receiving part until the vacuum degree reaches 1x10 -3 Pa and below, and then sealing the end of the vacuum receiving part.

[0031] Compared with the related art, the manufacturing method of the tungsten-copper string of the nuclear fusion tungsten divertor of the application first uses the fixing device to pre-press and seal the pre-assembled tungsten-copper string, and then processes it in a vacuum high-temperature high-pressure environment. The pre-tightening pressure applied by the fixing device and the high pressure generated by the vacuum furnace jointly cause the metal tube to deform towards the inner hole wall of the tungsten-copper block. At this time, the high-temperature condition facilitates the diffusion welding of the metal tube material and the oxygen-free copper material of the inner wall of the tungsten-copper block, greatly optimizing and ensuring the quality of the welding interface between the tungsten-copper block and the metal tube, and further improving the service life of the nuclear fusion device divertor made of the tungsten-copper string. BRIEF DESCRIPTION OF DRAWINGS

[0032] The application will be further described below in combination with the drawings and examples.

[0033] Figure 1 is a use structure perspective view of the fixing device of an embodiment of the application.

[0034] Figure 2 is an exploded view of the use structure of the fixing device of an embodiment of the application.

[0035] The figure mark explanation: 100 - fixing device; 101 - assembled closed shell; 101-1 - vacuum receiving part; 101-1-1 - air extraction pipe; 101-1-2 - sealing cover plate; 101-2 - first through hole; 1011 - shell body; 1012 - end cover; 1012-1 - air extraction port; 102 - split fixing block; 1021 - opposing fixing block; 1021-1 - fixing block monomer; 1022 - second through hole; 200 - tungsten-copper string; 201 - tungsten-copper block; 202 - metal tube. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme of the embodiments of the application will be described clearly and completely below in combination with the drawings of the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0037] Figure 1 and Figure 2 The structure diagram of a preferred embodiment of the present application is shown, which is a fixing device 100 for manufacturing a full-tungsten divertor tungsten-copper string 200, the tungsten-copper string 200 comprising a plurality of tungsten-copper blocks 201 stacked and a metal pipe 202 penetrating through the center of the tungsten-copper blocks 201; the fixing device 100 comprising an assembled closed shell 101 and a plurality of split fixing blocks 102 arranged in the assembled closed shell 101, the split fixing blocks 102 being used to compress the tungsten-copper blocks 201 in the circumferential direction; the assembled closed shell 101 being provided with a vacuum suction receiving part 101-1 communicating with the internal sealed space and a first through hole 101-2 for the metal pipe 202 to pass through.

[0038] The plurality of tungsten-copper blocks 201 are arranged in series on the metal pipe 202, and the contact part of the tungsten-copper blocks 201 and the metal pipe 202 needs to be fixedly connected as a welding interface to form the finished tungsten-copper string 200. The assembled closed shell 101 of the fixing device 100 provides a sealed carrier for the tungsten-copper blocks 201 arranged in series on the metal pipe 202 but not yet welded, and the two ends of the metal pipe 202 extend out of the assembled closed shell 101, so that the welding interface of the tungsten-copper blocks 201 and the metal pipe 202 is located in the assembled closed shell 101, and then the vacuum suction receiving part 101-1 can make the welding interface in a vacuum environment. At the same time, the split fixing blocks 102 arranged inside the assembled closed shell 101 and outside the tungsten-copper blocks 201 fully wrap and press the tungsten-copper blocks 201, realizing the pre-tightening force of the tungsten-copper blocks 201 and the metal pipe 202 and providing a pressure environment to promote and improve the welding effect. In summary, the use of the fixing device 100 of the present embodiment creates good basic conditions for obtaining a high-quality welding interface between the tungsten-copper blocks 201 and the metal pipe 202 of the tungsten-copper string 200.

[0039] In a further optional embodiment of the present embodiment, the assembled closed shell 101 comprises a shell body 1011 with at least one open end, and a closable end cover 1012 is arranged at the port of the shell body 1011, and the first through hole 101-2 is arranged on the end cover 1012 and the end part of the shell body 1011 opposite to the end cover 1012.

[0040] The assembled closed shell 101 is mainly used to wrap the stacked tungsten copper blocks 201, and before loading, it needs to be opened, for example, by the end cover 1012, and after assembly, it needs to be closed and form a sealed space inside the assembled closed shell 101 to achieve the purpose of vacuumizing. Since the metal pipe 202 of the tungsten copper string 200 will pass out of the assembled closed shell 101, the metal pipe 202 and the end cover 1012 of the assembled closed shell 101 will have an interface, and the opened end cover 1012 will also have an interface with the shell body 1011 of the assembled closed shell 101. These interfaces need to be fixed and sealed by electron beam or welding technology or other connection methods.

[0041] In terms of external design, the shape of the assembled closed shell 101 can be cylindrical or similar to a cylinder, or any other shape, and the specific shape can be determined by the external shape of the split type fixing block 102.

[0042] In a specific implementation, the assembled closed shell 101 is composed of a cylindrical shell body 1011 and two circular end covers 1012. The cylindrical shell body 1011 can be machined into a cylindrical shape by a mechanical method using a thin metal plate, and then two circular end covers 1012 made of metal plate material are welded at both ends to form a cylindrical shell body 1011. Each of the two circular end covers 1012 has a small hole (i.e., the first through hole 101-2) on it, and the diameter of the small hole is exactly the outer diameter of the metal pipe 202 of the tungsten copper string 200.

[0043] In a further optional embodiment of the present embodiment, the split type fixing block 102 includes at least one set of opposing fixing blocks 1021 wrapped around the outer periphery of the tungsten copper block 201, and the opposing fixing blocks 1021 are composed of at least two fixing block units 1021-1 annularly spliced together.

[0044] The entire split type fixing block 102 has an external shape consistent with the inner surface of the shell body 1011, and its internal part is spliced into a cavity matching the shape of the tungsten copper block 201, and the second through hole 1022 of the metal pipe 202 is provided at both ends of the cavity.

[0045] In a specific implementation, the number of groups of the fitting fixed blocks 1021 can be determined according to actual conditions, for example, the fitting fixed blocks 1021 can be processed into 3 groups (i.e. 6 fixed block monomers 1021-1), 4 groups (8 fixed block monomers 1021-1), 5 groups (10 fixed block monomers 1021-1), or even 1 group (2 fixed block monomers 1021-1). When the fitting fixed blocks 1021 are in 1 group, the shape of the fixed block monomers 1021-1 is one kind, which only needs to have a top wall, a side wall and a bottom wall. When the fitting fixed blocks 1021 are in 2 groups, the shape of the fixed block monomers 1021-1 has two kinds, one of which has one of the top wall or the bottom wall and the side wall, and the other of which has one of the bottom wall or the top wall and is opposite to the first one. When the fitting fixed blocks 1021 are in 3 groups, the shape of the fixed block monomers 1021-1 has three kinds, one of which has a single top wall, one of which has a single bottom wall, and one of which has a single side wall. When the fitting fixed blocks 1021 are in 4 groups or more, the shape of the fixed block monomers 1021-1 has three kinds, one of which has a single top wall, one of which has a single bottom wall, and one of which has a single side wall. The difference between them is that the number of the fixed block monomers 1021-1 having a single side wall is 2 or more, and the number of the other two kinds is only 1. Regardless of the number of the fitting fixed blocks 1021, the shape of the fixed block monomers 1021-1 can be set to meet the use requirements, and finally aims to provide an external surface and an internal chamber which are adapted to the shell body 1011 and the tungsten-copper block 201 respectively.

[0046] The appearance shape of the fixed block monomers 1021-1 needs to be consistent with the inner surface shape of the shell body 1011, which can be cylindrical or cylindrical-like, or other shapes such as rectangular. The material of the fixed block monomers 1021-1 can be metal material or other materials. Taking the specific implementation shown in the figure as an example, the manufacturing process of the split fixed block 102 is introduced as follows:

[0047] First, in this specific implementation, a split fixed block 102 is provided, which is in the shape of a cylinder as a whole, and is composed of three groups of fitting fixed blocks 1021, i.e. one middle fitting fixed block and two end fitting fixed blocks. The middle fitting fixed block and the end fitting fixed block each include two symmetrically split fixed block monomers 1021-1. The middle fitting fixed block is provided with a through passage in the middle for fitting the side wall of the tungsten-copper string 200, and the through passage is used to place the tungsten-copper string 200 and corresponds to the tungsten-copper block 201 of the tungsten-copper string 200. The end fitting fixed block is arranged at both ends of the tungsten-copper string 200 and is provided with a second through hole 1022 in the middle, and the second through hole 1022 is used to place the metal tube 202 of the tungsten-copper string 200.

[0048] Secondly, in the manufacturing process, the middle part of the fixed block can be made of a metal cylinder, and a rectangular hole is first processed in the middle of the metal cylinder (corresponding to the through channel), the length and width of the rectangular hole are consistent with the length and width of the tungsten-copper block 201, and the hole height is consistent with the total length of the tungsten-copper block 201. After processing, the rectangular hole is cut into two pieces along the diagonal line (without chamfering). The end part of the fixed block is also made of a metal cylinder, and a circular hole (i.e. the second through hole 1022) is first processed in the middle of the metal cylinder, and the hole diameter is slightly larger than the outer diameter of the metal pipe 202, which can be passed through and welded.

[0049] In a further optional embodiment of the present embodiment, a plurality of grooves are symmetrically arranged in the chamber along the length of the tungsten-copper string 200, which are used to fixedly connect the tungsten-copper string 200 and the split fixed block 102. Each fixed block 1021-1 is provided with a groove, which is used to realize fixed connection by welding at the barrel groove position.

[0050] In specific implementation, the groove can be formed by processing a circular arc chamfer at one pair of diagonal positions of the rectangular hole of the middle part of the fixed block. The chamfer radius can be 0-10 mm.

[0051] In a further optional embodiment of the present embodiment, a soft high-temperature-resistant buffer layer is arranged between the split fixed block 102 and the tungsten-copper block 201. In specific implementation, a soft high-temperature-resistant buffer layer is arranged between the middle part of the fixed block and the tungsten-copper block 201, and between the end part of the fixed block and the metal pipe 202.

[0052] The arrangement of the soft high-temperature-resistant buffer layer can avoid damage caused by hard contact to a certain extent, especially in a high-pressure environment, which more urgently needs to set the soft high-temperature-resistant buffer layer.

[0053] In a further preferred embodiment of the present embodiment, the soft high-temperature-resistant buffer layer is made of graphite paper material resistant to high temperature above 700 degrees, and the thickness of the graphite paper is 0.1-2 mm. The graphite paper material with the specific thickness and temperature resistance is only one of the preferred ways, which can achieve better expected use effect.

[0054] In a further optional embodiment of the present embodiment, the vacuum suction part 101-1 includes an air suction pipe 101-1-1 fixedly arranged on the assembled closed shell 101, and the port of the air suction pipe 101-1-1 is provided with a sealing plug or a sealing cover plate 101-1-2.

[0055] Generally, the embodiment is to put the tungsten-copper string 200 assembled with the fixing device 100 into a vacuum furnace for processing and manufacturing under certain high temperature and high pressure conditions. Before being put in, the inside of the assembled closed shell 101 needs to be in a vacuum state in advance, that is, the inside is pumped by using the end of the air exhaust pipe 101-1-1 connected thereto. In order to form an absolutely sealed space in the whole assembled closed shell 101, the end of the air exhaust pipe 101-1-1 is sealed after pumping, and a sealing plug or sealing cover plate 101-1-2 is generally used to achieve the sealing.

[0056] In the preparation of the air exhaust pipe 101-1-1, a metal pipe 202 is generally selected, the length of the metal pipe 202 is arbitrarily set, and the diameter of the metal pipe 202 is determined according to the size of the end cover 1012 of the assembled closed shell 101. When the air exhaust pipe 101-1-1 is fixed, a small hole (i.e. air exhaust port 1012-1) can be opened on the above-mentioned end cover 1012, and then the metal pipe 202 is welded to the position of the small hole, and the welding seam is ensured not to leak.

[0057] Another technical solution adopted by the present application to solve its technical problems is:

[0058] A manufacturing method of a tungsten-copper string 200 of a nuclear fusion full-tungsten divertor, comprising the following operation steps:

[0059] 1) preparing tungsten-copper blocks 201 of the tungsten-copper string 200;

[0060] The tungsten-copper block 201 is a combination of a tungsten block and oxygen-free copper. First, the tungsten plate is processed into a tungsten block with a circular hole, and then the inner hole surface of the tungsten block is connected with an oxygen-free copper intermediate layer (the oxygen-free copper can be cast onto the inner hole surface by casting method, and the thickness of the oxygen-free copper is about 1 mm) to form the tungsten-copper block 201;

[0061] 2) preparing a metal pipe 202 of the tungsten-copper string 200;

[0062] The metal pipe 202 is usually made of copper alloy material, such as copper-chromium-zirconium material, which can be easily prepared by using existing technology;

[0063] 3) pre-assembling the tungsten-copper string 200;

[0064] First, a plurality of tungsten-copper blocks 201 are inserted into a copper alloy metal pipe 202 to form a tungsten-copper string 200 like a "sugar cane". In order to ensure that the spacing between each tungsten-copper block 201 is uniform, a circular metal gasket (about 0.5 mm) can be placed between two tungsten-copper blocks 201. At this time, the copper alloy metal pipe 202 and the tungsten-copper block 201 are not bonded, and the final purpose of the tungsten-copper processing and manufacturing is to bond or weld them well.

[0065] 4) the fixed device 100 for manufacturing the tungsten-copper string 200 of the full-tungsten divertor of nuclear fusion is prepared;

[0066] 5) the pre-assembled tungsten-copper string 200 in step 3) is installed into the fixed device 100 in step 4), pre-tightening, vacuumizing and sealing are performed, and the pre-assembled tungsten-copper string 200 is taken as a test piece after assembly;

[0067] 6) the test piece is placed into a vacuum furnace, the temperature in the furnace is set to rise from normal temperature to about 300-800 degrees, then the temperature is kept for 1-10 hours, and then the furnace is cooled to normal temperature; at the same time, the pressure in the furnace is set to rise from normal pressure to 50-150 MPa, then the pressure is kept for 1-10 hours, and then the pressure is reduced to normal pressure;

[0068] 7) after the above work is completed, the test piece is taken out from the vacuum furnace, and the fixed device 100 is broken open, specifically, the assembled sealing shell 101 and the split fixed block 102 are broken open respectively, and then the tungsten-copper string 200 is taken out.

[0069] In a further optional embodiment of the present embodiment, the step 5) specifically comprises:

[0070] S1, the pre-assembled tungsten-copper string 200 is installed into the split fixed block 102, and a soft high-temperature-resistant buffer layer is arranged between the two; the split fixed block 102 is pre-tightened, the pre-tightening force is 1000N~10000N, then the pre-tightening force is kept unchanged, and the split fixed block 102 is fixed at the interface of each set of split fixed blocks 1021 by spot welding method to avoid displacement, and a first combination of the tungsten-copper string 200 and the split fixed block 102 is obtained;

[0071] S2, the first combination is placed into the assembled sealing shell 101, a soft high-temperature-resistant buffer layer is arranged between the combination and the assembled sealing shell 101, then the assembled sealing shell 101 is welded and sealed, and a second combination is obtained;

[0072] S3, the inside of the assembled sealing shell 101 is vacuumized through the vacuumizing connector 101-1 until the vacuum degree reaches 1×10 -3 Pa and below, then the end of the vacuumizing connector 101-1 is sealed, and the entire shell is ensured to be airtight (air leakage rate <1×10 -10 Pa· m 3 / s).

[0073] The split fixing block 102 of the fixing device 100 is not only simple to process and low in cost, but also easy to disassemble after the tungsten-copper string 200 is processed and manufactured. Moreover, the split fixing block 102 of the fixing device 100 provides a large pre-tightening force when installed and then fixed, ensuring that the fixing block monomer 1021-1 and the tungsten-copper string 200 have a strong pre-tightening force, which is an important step in the processing and manufacturing process of the tungsten-copper string 200. When the test piece is placed in the vacuum furnace, the metal pipe 202 of the tungsten-copper string 200 has a pressure of 50-150 MPa, and the outer surface of the assembled closed shell 101 also has the same pressure. Under the joint action of the two pressures, the metal pipe 202 (copper-chromium-zirconium pipe) will deform in the direction of the inner hole wall of the tungsten-copper block 201. At this time, the high-temperature condition is easy to diffuse and weld the chromium-zirconium-copper material and the inner wall of the tungsten-copper block 201. When the copper-chromium-zirconium pipe expands and deforms in the direction of the inner hole wall of the tungsten-copper block 201, it extrudes the tungsten-copper block 201 to expand and deform. At this time, the pre-tightening force provided by the fixed block can reduce the expansion deformation of the tungsten-copper block 201, and the fixed block 1021 has been fixed by spot welding, which further constrains the expansion deformation of the tungsten-copper block 201. In addition, the fixing device 100 and the manufacturing method are suitable for processing tungsten-copper strings 200 of any length. As long as the size of the assembled closed shell 101 and the split fixing block 102 is adjusted according to the length of the tungsten-copper string 200, it does not need to be redesigned, and it is suitable for mass production.

[0074] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification and equivalent change made on the basis of the technical essence of the present application fall within the protection scope of the present application.

Claims

1. A fixture for manufacturing a nuclear fusion tungsten divertor tungsten copper string, the tungsten copper string comprising a plurality of tungsten copper blocks stacked and a metal tube disposed through the center of the tungsten copper blocks; characterized in that: The fixing device comprises an assembled closed shell and a plurality of split fixing blocks arranged in the assembled closed shell and used for compressing the tungsten-copper block in the circumferential direction; the assembled closed shell is provided with a vacuum suction receiving part communicating with an internal sealed space and a first through hole through which the metal tube is sealed out; The split fixing block comprises at least one set of matched fixing blocks wrapped around the outer periphery of the tungsten-copper block, and the matched fixing blocks are formed by annularly splicing at least two fixing block monomers; the outer part of the entire split fixing block is consistent with the shape of the inner surface of the shell body, and the inner part is split into a chamber matching the shape of the tungsten-copper block, and the chamber is provided with a second through hole for the metal tube at both ends.

2. The nuclear fusion tungsten divertor tungsten copper string manufacturing fixture of claim 1, wherein: The assembled closed shell comprises a shell body with at least one open end, and the shell body is provided with a closable end cover at the port; the first through hole is arranged on the end cover and the end part of the shell body opposite to the end cover.

3. The nuclear fusion tungsten divertor tungsten copper string manufacturing fixture of claim 1, wherein: The split fixing block comprises three sets of matched fixing blocks, namely one middle matched fixing block and two end matched fixing blocks; the middle matched fixing block and the end matched fixing block each comprise two symmetrically split fixing block monomers; the middle matched fixing block is provided with a through channel for abutting against the side wall of the tungsten-copper string in the middle, and the end matched fixing block is arranged at both ends of the tungsten-copper string and is provided with a second through hole in the middle.

4. The nuclear fusion tungsten divertor tungsten copper string manufacturing fixture of claim 1 or 3, wherein: A plurality of through grooves along the length of the tungsten-copper string are symmetrically arranged in the chamber and used for fixedly connecting the tungsten-copper string and the split fixing block; one through groove is arranged on each fixing block monomer.

5. The nuclear fusion tungsten divertor tungsten copper string manufacturing fixture of claim 1 or 2 or 3, wherein: A soft high-temperature-resistant buffer layer is further arranged between the split fixing block and the tungsten-copper block.

6. The nuclear fusion tungsten divertor tungsten copper string manufacturing fixture of claim 5, wherein: The soft high-temperature-resistant buffer layer is made of graphite paper material resistant to high temperature above 700 degrees, and the thickness of the graphite paper is 0.1-2 mm.

7. The nuclear fusion tungsten divertor tungsten copper string manufacturing fixture of claim 1 or 2 or 3, wherein: The vacuum suction receiving part comprises an air suction pipe fixedly arranged on the assembled closed shell, and the port of the air suction pipe is provided with a sealing plug or a sealing cover plate.

8. A method of manufacturing a nuclear fusion tungsten divertor tungsten copper strand, comprising: 1) tungsten-copper block for preparing a tungsten-copper string; 2) metal tube for preparing a tungsten-copper string; 3) pre-assembled tungsten-copper string; characterized in that the method further comprises the following operation steps: 4) preparing the fixing device for manufacturing the tungsten-copper string of the tungsten divertor of nuclear fusion according to any one of claims 1 to 7; 5) installing the pre-assembled tungsten-copper string in step 3) into the fixing device in step 4), pre-tightening, vacuumizing and sealing fixing, as a test piece after assembly; 6) placing the test piece into a vacuum furnace, setting the temperature in the furnace from room temperature to 300-800 degrees, and then keeping the temperature for 1-10 hours, and then cooling to room temperature with the furnace; at the same time, setting the pressure in the furnace from normal pressure to 50-150 MPa, and then keeping the pressure for 1-10 hours, and then reducing to normal pressure; After the above work is completed, the test piece is taken out from the vacuum furnace, the fixing device is broken, and then the tungsten-copper string is taken out; In the step 5), the method specifically comprises: S1, installing the pre-assembled tungsten-copper string into the split fixing block, and arranging a soft high-temperature-resistant buffer layer therebetween; pre-tightening the split fixing block, the pre-tightening force being 1000 N-10000 N, then keeping the pre-tightening force unchanged, and fixing at the junction of each set of matched fixing blocks by spot welding, to obtain a first combination of the tungsten-copper string and the split fixing block; S2, placing the first combination into the assembled closed shell, installing a soft high-temperature-resistant buffer layer between the combination and the assembled closed shell, and then welding and sealing the assembled closed shell to obtain a second combination; S3. The interior of the assembled closure shell is evacuated by the vacuum pickup until the vacuum reaches 1 x 10 -3 Pa and below, and the end of the vacuum pickup is sealed.

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