Cable structure for connecting interior and exterior of vacuum chamber of fusion device

Abstract

The invention provides a cable structure for connection inside and outside a vacuum chamber of a fusion device, and belongs to the technical field of wiring inside and outside the vacuum chamber of the fusion device. A first metal sheath, a metal mesh grid, an interface flange, a second metal sheath, a corrugated pipe and a third metal sheath which are electrically connected with one another are sequentially sleeved outside the internal core wire, the first metal sheath is electrically connected with the joint of the equipment shell, and the end part of the third metal sheath is connected with a cable interface to form an electrical connection section; the corrugated pipe is provided with at least two sections; a cable section formed by the equipment shell and the first metal sheath forms a rigid section, and a cable section formed by the metal woven mesh, the interface flange, the second metal sheath, the corrugated pipe and the third metal sheath forms a flexible section. The signal transmission quality can be improved, and the safety and stability of the core wire in the cable are ensured.

Description

Technical Field

[0001] This invention belongs to the field of wiring technology for vacuum chambers and exteriors of fusion devices, and more specifically, it is a cable structure for connecting the vacuum chambers and exteriors of fusion devices. Background Technology

[0002] During operation, the fusion reactor is equipped with devices inside the vacuum chamber to collect data. Some of the collected data needs to be transmitted via electrical signals to external devices for signal processing, typically using cables. However, due to the complex electromagnetic environment inside the vacuum chamber during operation, with significant neutron and thermal radiation, high-temperature resistant mineral-insulated cables are required for signal transmission.

[0003] Mineral-insulated cables come in two types: rigid and flexible, both with conductors made of high-purity copper. Rigid mineral-insulated cables have an insulation layer composed of dense magnesium oxide ceramic powder, with a seamless metal tube as the sheath. Flexible mineral-insulated cables have an insulation layer composed of ceramicized silicone rubber or mica tape with a ceramic core structure, with interlocked armored aluminum alloy or corrugated copper metal tubes as the sheath. Rigid mineral-insulated cables are more heat-resistant and impact-resistant, while flexible mineral-insulated cables offer greater flexibility in cable routing.

[0004] The electrical signals of the internal equipment of the existing fusion host are transmitted through rigid mineral-insulated cables. The transmission is interrupted at the interface between the vacuum and the atmosphere and connected to the electrical feeder on the flange. On the atmospheric side, ordinary signal lines are used to connect the electrical feeder on the flange to the external equipment to continue transmitting signals.

[0005] However, the signal lines installed in the existing technology will break at the interface between vacuum and atmosphere, affecting the signal transmission quality. Furthermore, due to processing and assembly errors, the cable structure cannot be accurately installed into the pre-drilled holes on the flange surface. In addition, electromagnetic shielding of the cable in the complex electromagnetic environment inside the host is not considered. Summary of the Invention

[0006] In view of the current state of the technology mentioned in the background art, and in order to overcome the corresponding defects in the prior art, the present invention specifically discloses a cable structure for connecting the vacuum chamber and the outside of a fusion device, which can better solve the problems mentioned in the background art.

[0007] To overcome the deficiencies of the existing technology, those skilled in the art provide the following technical solutions: A cable structure for connecting the vacuum chamber and the outside of a fusion device includes bundled internal core wires that pass through an interface flange at the boundary between the vacuum side and the atmospheric side. From the vacuum side to the atmospheric side, the internal core wires are sequentially fitted with the following electrically connected components: a first metal sheath, a metal braided mesh, an interface flange, a second metal sheath, a corrugated tube, and a third metal sheath. The first metal sheath is electrically connected to the device housing, and the end of the third metal sheath is connected to a cable interface to form an electrical connection segment. The corrugated tube has at least two sections. The cable segment formed by the device housing and the first metal sheath forms a rigid segment, while the cable segment formed by the metal braided mesh, the interface flange, the second metal sheath, the corrugated tube, and the third metal sheath constitutes a flexible segment.

[0008] Furthermore, the internal core wire consists of multiple strands of sub-core wires spirally wound together and wrapped with an inorganic mineral insulation tape.

[0009] Furthermore, the internal core wires of the rigid section are filled with dense inorganic mineral insulating filler, while the internal core wires of the flexible section are not filled with inorganic mineral insulating filler.

[0010] Furthermore, the cable interface includes an electrical interface and an air extraction interface.

[0011] Furthermore, the metal braided mesh and the interface flange port are connected by a connecting sleeve. The connecting sleeve is shaped by sweeping an S-shaped cross section 360 degrees to form two annular slots, an outer annular slot for coaxial insertion of the interface flange port, and an inner annular slot whose outer side wall is coaxially aligned with the end face of the metal braided mesh and electrically connected as one unit.

[0012] Furthermore, the connecting sleeve is a thin-walled metal sleeve with elasticity. After the connecting sleeve is installed, the outer annular slot is in a radially expanded state, and the inner annular slot is in a radially compressed state.

[0013] Furthermore, the inner and outer sides of the port sidewall of the interface flange are respectively tightly attached to the two opposite sidewalls of the outer annular slot to form a double-sided seal.

[0014] Furthermore, it also includes a mounting assembly for fixing the connecting sleeve. The mounting assembly includes an annular main ring, which is coaxially located outside the inner core wire. The end of the main ring facing the interface flange has a plurality of grooves arranged in an annular array. The grooves are arranged radially along the main ring. A stud is rotatably installed in each groove. The stud is threadedly provided with three tubular clamping plates. The outermost first clamping plate and the innermost third clamping plate have the same thread direction. The second clamping plate has the opposite thread direction to the first clamping plate. When the stud rotates, the first and second clamping plates clamp the corresponding parts of the connecting sleeve that are in close contact with the inner and outer sides of the interface flange port sidewall. The third clamping plate presses the part of the connecting sleeve that contacts the inner core wire.

[0015] Furthermore, one end of the three clips located in the groove is a T-shaped sliding part, which is threaded onto the stud. The stud is fixed with a driven gear at one end located outside the main ring. All driven gears mesh with a driving gear, which is coaxially and integrally connected to an adjusting cover. The adjusting cover is coaxially rotated and non-separatedly fitted onto the end of the main ring away from the clips.

[0016] Furthermore, a compressed disc spring is sandwiched between the adjusting cover and the main ring, and the end of the adjusting cover away from the clamp has a hexagonal wrench part; the end face of the driven gear has a threaded connector, which is threadedly connected to a locking nut, and when the locking nut is tightened, the anti-slip pad embedded in its end face is pressed into contact with the outer side of the driving gear.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the core wire runs continuously from the equipment inside the vacuum chamber to the equipment on the atmospheric side, resulting in better signal transmission quality.

[0018] 2. At the interface between the vacuum and atmospheric sides, the present invention designs a flexible section of mineral-insulated cable on the vacuum side, using a metal braided mesh as a sheath and a corrugated pipe as a sheath on the outside, which can compensate for processing and assembly errors and accurately install it onto the flange surface; at the same time, the corrugated pipe on the atmospheric side can eliminate the deviation caused by interface displacement during the operation of the fusion host, ensuring the safety and stability of the internal core wires of the cable.

[0019] 3. In this invention, a rigid mineral-insulated cable is used in the vacuum chamber section, with a metal tube as the sheath. When connected to the internal equipment housing, for example, by welding, a metal braided mesh of the same material is used, tightly welded to the metal sleeve and interface flange of the rigid section. On the atmospheric side, a corrugated pipe of the same material is tightly welded to the interface and the mineral-insulated cable sheath on the atmospheric side, forming a Faraday cage. This shields the signal from the influence of alternating magnetic fields and other electric fields, while ensuring that the vacuum level of the vacuum chamber remains unaffected.

[0020] Other functions and features of the present invention will be described in detail in the following embodiments to provide a full understanding of the concept of the present invention and to enable its practical application in production. Attached Figure Description

[0021] Figure 1 This invention provides a cable structure for connecting the inside and outside of a fusion device's vacuum chamber. Figure 2 This is a schematic diagram of the cross-section of the rigid segment where the first metal sleeve is located; Figure 3 This is a schematic diagram showing the connection between the rigid section containing the first metal sleeve and the equipment casing. Figure 4 This is a schematic diagram of the corrugated pipe section. Figure 5 This is a schematic diagram of the electrical connection section; Figure 6 This is a schematic diagram of the electrical connections of the metal braided section; Figure 7 An axial sectional view of the structure in which the metal braided section is connected to the interface flange port via a connecting sleeve; Figure 8 for Figure 7 Enlarged view of the structure at point A in the middle; Figure 9 for Figure 7 An enlarged view of another implementation structure at point A; Figure 10 for Figure 6 The left view of the connecting sleeve in the middle.

[0022] As shown in the figure, the equipment includes: 1. outer casing; 2. first metal sheath; 3. metal braided mesh; 4. interface flange; 5. second metal sheath; 6. corrugated pipe; 7. third metal sleeve; 8. cable interface; 9. connecting sleeve; 10. outer ring slot; 11. inner ring slot; 12. sub-core wire; 13. inorganic mineral insulation tape; 14. inorganic mineral insulation filler; 15. electrical interface; 16. air extraction interface; 17. internal core wire; 18. first clamp; 19. second clamp; 20. third clamp; 21. main body ring; 22. adjusting cover; 23. wrench part; 24. stud; 25. driven gear; 26. driving gear; 27. T-shaped sliding part; 28. locking nut; 29. ​​anti-slip pad; 20. disc spring; 20. vacuum side; 21. atmospheric side; 22. flexible section; 23. rigid section. Detailed Implementation

[0023] Based on the accompanying drawings and the following description, the technical solutions in the embodiments of the present invention can be clearly and completely described. However, it should be understood that the embodiments mentioned herein are merely one or several specific methods of the present invention, and not all implementation structures or method steps.

[0024] This invention proposes a cable structure for connecting the vacuum chamber and the outside of a fusion device, specifically including internal core wires 15 bundled into a cable, such as... Figures 1-5 As shown, the inner core wire 15 passes through the interface flange 4 at the boundary between the vacuum side M and the atmospheric side N. From the vacuum side M to the atmospheric side N, the inner core wire 15 is sequentially encased with the following electrically connected components: a first metal sheath 2, a metal braided mesh 3, an interface flange 4, a second metal sheath 5, a bellows 6, and a third metal sheath, forming a continuous, closed Faraday cage. Refer to the following documentation during fabrication: Figure 3The first metal sheath 2 is electrically connected to the connection point of the equipment housing 1, and a cable interface 8 is connected to the end of the third metal sheath 7 to form an electrical connection section. In this embodiment, the corrugated pipe 6 has at least two sections, such as... Figure 1 In this embodiment, the cable segment formed by the device housing 1 and the first metal sheath 2 constitutes a rigid segment C, while the cable segment composed of the aforementioned metal braided mesh 3, interface flange 4, second metal sheath 5, corrugated pipe 6, and third metal sheath constitutes a flexible segment B. Based on the above structural design principles, a detailed example is provided below: This cable structure mainly consists of four parts: rigid segment C, flexible segment B, cable interface 8, and device housing 1. For example... Figure 2 As shown, the inner core wire 15 is wrapped with inorganic mineral insulation tape 11, and multiple strands of sub-core wire 10 are spirally wound together to form the inner core wire 15. The outer periphery of the inner core wire 15 is then wrapped with inorganic mineral insulation tape 11. The inorganic mineral insulation tape 11 ensures insulation between core wires and between core wires and metal sheath.

[0025] In this embodiment, the diagnostic equipment is housed within the device housing 1. The housing is a sealed cavity made of metal, with holes made as small as possible according to the needs of the equipment. The gaps in the internal core wires 15 of the rigid segment C are filled with dense inorganic mineral insulating filler 12. The entire wire harness assembly is then wrapped with a metal sheath, forming the rigid segment C of the cable structure in this embodiment. The metal sheath of the rigid segment C is connected to the device housing 1 through a tight conductive connection, ensuring the continuity of the Faraday cage. This rigid segment C is positioned closest to the plasma, enabling it to withstand complex electromagnetic environments, higher temperatures, and possess sufficient strength.

[0026] In practice, the core wire configuration of flexible segment B is the same as that of rigid segment C. However, it lacks the dense inorganic mineral insulation filler 12, and the metal sheath configuration is different. Near the vacuum-atmosphere interface on the vacuum side M, a metal braided mesh 3 serves as the metal sheath. The metal braided mesh 3 is connected to the metal sheath of rigid segment C via a conductive connection, and also to the interface flange 4 via a conductive connection. During cable assembly, due to processing and installation errors, it is difficult for the cable to directly align with the interface flange 4, resulting in a certain deviation. The connection between the metal braided mesh 3 and rigid segment C and interface flange 4 can eliminate this deviation through cable deformation in this section, ensuring a precise connection between the cable and interface flange 4 while maintaining the integrity of the Faraday cage structure.

[0027] like Figure 1 , Figure 4The flexible section B on the atmospheric side N consists of 6 bellows sections and an electrical connection section. The metal sheath of the flexible section B near the flange interface consists of two or more bellows sections 6. The bellows 6 are connected to the interface flange 4 and the metal sheath of the electrical connection section (i.e., the second metal sleeve 5 and the third metal sleeve 7) through a conductive sealing connection to ensure the integrity of the Faraday cage structure. During the operation of the fusion main unit, due to the complex thermal and mechanical environment, significant displacement may occur at the interface. The deformation of two or more bellows sections 6 eliminates this displacement, ensuring the electrical interface 13 remains stable, while the bellows 6 ensure good sealing of the fusion main unit.

[0028] In this embodiment, the electrical interface 13 is connected to the metal sheath via a conductive sealing connection. The rear end of the electrical interface 13 is connected to the core wire and inserted into the diagnostic equipment on the atmospheric side (N) for signal transmission, ensuring the integrity of the Faraday cage interface. An evacuation port 14 is provided on the electrical connection section to maintain the vacuum level of the fusion main unit.

[0029] As one of the preferred implementation structures, such as Figure 1 and Figure 6 As shown, the metal braided mesh 3 is connected to the interface flange 4 port via a connecting sleeve 9, the shape of which is as follows: Figures 6-7 ,as well as Figure 10 As shown, specifically, a thin-walled rotary structure is formed by sweeping an S-shaped cross-section 360 degrees to create two annular slots, inner and outer. The outer annular slot 901 allows the interface flange 4 to be coaxially inserted, while the outer wall of the inner annular slot 902 is electrically connected to the end face of the metal braided mesh 3 in a coaxial alignment. In this embodiment, as... Figure 7 As shown, the connecting sleeve 9 is a thin-walled metal sleeve with elasticity. After the connecting sleeve 9 is installed, the outer annular slot 901 is in a radially expanded state, and the inner annular slot 902 is in a radially compressed state, firmly installing the cable in the interface flange 4 and maintaining the continuity of the Faraday cage at the connection. To improve the above technical effect, during installation, the inner and outer sides of the sidewalls of the port of the interface flange 4 are required to be tightly attached to the two opposite sidewalls of the outer annular slot 901 to form a double-sided seal.

[0030] In this embodiment, a mounting component for fixing the connecting sleeve 9 is also included, such as... Figures 7-8As shown, the installation assembly includes an annular main ring 19, which is coaxially located outside the inner core wire 15. The main ring 19 is designed to adapt to the thickness of the cable to be installed. If the cable is thin, the end of the clamp located inside the main ring 19 can be designed to be larger, and the size of the corresponding main ring 19 can be designed to be larger, based on the thinner clamp mentioned later, to facilitate operation and installation. Specifically, the main ring 19 has a plurality of grooves arranged in an annular array at one end facing the interface flange 4. The grooves are arranged radially along the main ring 19. A stud 21 is rotatably installed in each groove. Three tubular clamps are threadedly fitted on the stud 21. The outermost first clamp 16 and the innermost third clamp 18 have the same thread direction and move synchronously in the same direction, for example, by the movement of the cable. The second clamp 17 has the opposite thread direction to the first clamp 16 so that it moves outward toward the cable and presses the surface of the corresponding connecting sleeve 9. In the above structural design, during actual manufacturing, the third clamping piece 18 is located near the joint between the connecting sleeve 9 and the metal braided mesh 3. If sampling welding is used, an annular groove can be machined on the inner side of the third clamping piece 18 at the joint to accommodate any possible weld protrusions. In general, during use, when the drive stud 21 rotates, the first clamping piece 16 and the second clamping piece 17 clamp the corresponding parts of the connecting sleeve 9, which are tightly attached to the inner and outer sides of the interface flange 4 port sidewall. The third clamping piece 18 presses against the part of the connecting sleeve 9 that contacts the internal core wire 15, thus achieving the purpose of fixing the connecting sleeve 9 to the interface flange 4 port and aligning it with the end face of the metal braided mesh 3, thereby improving the reliability of the connection.

[0031] In the above design, one end of the three clips located within the sliding groove is a T-shaped sliding part 24. The T-shaped sliding part 24 is threaded onto the stud 21. A driven gear 22 is fixed to one end of the stud 21 located outside the main body ring 19. All driven gears 22 mesh with a driving gear 23, which is coaxially and integrally connected to an adjusting cover 20. The adjusting cover 20 is similar to a bottle cap structure, coaxially rotating and non-separatingly fitted onto the end of the main body ring 19 away from the clips. Specifically, an annular guide ridge can be machined on the inner wall of the adjusting cover 20. The guide ridge is rotatably installed inside the side of the main body ring to prevent the adjusting cover 20 from axially moving and disengaging. During the rotation of the adjusting cover 20, all studs 21 rotate synchronously. In specific manufacturing, as follows... Figure 8 A compressed disc spring 27 is also clamped between the adjusting cover 20 and the main ring 19. The end of the adjusting cover 20 facing away from the clamping plate has a hexagonal wrench portion 2001 for rotating the adjusting cover 20. Under the elastic preload of the disc spring 27, the adjusting cover 20 maintains a certain stability, forming a damped rotational installation. Furthermore, a threaded connector is also present on the end face of the driven gear 22, which connects to... Figure 9The locking nut 25 shown is threaded, and when the locking nut 25 is tightened, the anti-slip rubber pad 26 embedded in its end face is pressed against the outer side of the drive gear 23. All the anti-slip rubbers in the annular array, together with the disc spring 27 mentioned above, prevent the adjusting cover 20 from rotating and maintain its fixed firmness.

[0032] This invention is not limited to the field covered by this embodiment. Some well-known structures or principles have not been further described. However, those skilled in the art can theoretically know all the well-known technologies in this field prior to the application date or priority date, and can fully master all the prior art in this field. They also have the means and ability to apply these prior art in practical design. Under the technical guidance provided in this application, those skilled in the art can more comprehensively improve and implement this invention by combining their own capabilities. Furthermore, it should be noted that although the text and graphics of the above embodiments have shown specific implementation scenarios of the invention, those skilled in the art can make various obvious extensions and expansions to these embodiments without departing from the design concept of the invention, forming different embodiments. However, this does not affect the fact that the scope of protection of the invention is covered and embodied by the technical features of this claim and equivalent technical features.

Claims

1. A cable structure for connecting the inside and outside of a fusion device vacuum chamber, comprising bundled internal core wires (15), characterized in that, The internal core wire (15) passes through the interface flange (4) at the boundary between the vacuum side and the atmospheric side. From the vacuum side to the atmospheric side, the internal core wire (15) is sequentially fitted with the following electrically connected components: a first metal sheath (2), a metal braided mesh (3), an interface flange (4), a second metal sheath (5), a corrugated pipe (6), and a third metal sheath. The first metal sheath (2) is electrically connected to the equipment housing (1), and the end of the third metal sheath (7) is connected to a cable interface (8) to form an electrical connection segment. The corrugated pipe (6) has at least two sections. The cable segment composed of the equipment housing (1) and the first metal sheath (2) forms a rigid segment (C), and the cable segment composed of the metal braided mesh (3), the interface flange (4), the second metal sheath (5), the corrugated pipe (6), and the third metal sheath forms a flexible segment (B).

2. The cable structure for connecting the vacuum chamber and the outside of a fusion device according to claim 1, characterized in that, The inner core wire (15) consists of multiple sub-core wires spirally wound together and wrapped with an inorganic mineral insulating tape (11) on the outside.

3. A cable structure for connecting the vacuum chamber and the outside of a fusion device according to claim 2, characterized in that, The rigid section (C) has its internal core wire (15) filled with dense inorganic mineral insulating filler (12), while the flexible section (B) has its internal core wire (15) not filled with inorganic mineral insulating filler (12).

4. The cable structure for connecting the vacuum chamber and the outside of a fusion device according to claim 1, characterized in that, The cable interface (8) includes an electrical interface (13) and an air extraction interface (14).

5. A cable structure for connecting the vacuum chamber and the outside of a fusion device according to claim 1, characterized in that, The metal braided mesh (3) is connected to the port of the interface flange (4) by a connecting sleeve (9). The connecting sleeve (9) is shaped by sweeping an S-shaped cross section 360 degrees to form two annular slots, an outer annular slot (901) for coaxial insertion of the port of the interface flange (4), and an inner annular slot (902) whose outer side wall is coaxially aligned with the end face of the metal braided mesh (3) and electrically connected as one unit.

6. A cable structure for connecting the inside and outside of a fusion device vacuum chamber according to claim 5, characterized in that, The connecting sleeve (9) is a thin-walled metal sleeve with elasticity. After the connecting sleeve (9) is installed, the outer annular slot (901) is in a radially expanded state and the inner annular slot (902) is in a radially compressed state.

7. A cable structure for connecting the vacuum chamber and the outside of a fusion device according to claim 6, characterized in that, The inner and outer sides of the sidewall of the port of the interface flange (4) are respectively closely attached to the two opposite sidewalls of the outer annular slot (901) to form a double-sided seal.

8. A cable structure for connecting the vacuum chamber and the outside of a fusion device according to claim 5, characterized in that, It also includes an installation assembly for fixing the connecting sleeve (9), the installation assembly including an annular main body ring (19), the main body ring (19) being coaxially located outside the inner core wire (15), the main body ring (19) having a plurality of annularly arranged grooves at one end facing the interface flange (4), the grooves being arranged radially along the main body ring (19), a stud (21) being rotatably installed in each groove, the stud (21) having three tubular clamping plates threadedly fitted, the outermost first clamping plate (16) and the innermost third clamping plate (18) having the same thread direction, the second clamping plate (17) having the opposite thread direction to the first clamping plate (16), so that when the stud (21) rotates, the first clamping plate (16) and the second clamping plate (17) clamp the corresponding part of the connecting sleeve (9) that is tightly attached to the inner and outer sides of the port sidewall of the interface flange (4), and the third clamping plate (18) presses the part of the connecting sleeve (9) that contacts the inner core wire (15).

9. A cable structure for connecting the vacuum chamber and the outside of a fusion device according to claim 8, characterized in that, The three clips are located at one end of the slide groove as a T-shaped sliding part (part 24). The T-shaped sliding part (part 24) is threaded onto the stud (21). The stud (21) is fixed with a driven gear (22) at one end outside the main body ring (19). All driven gears (22) mesh with a driving gear (23). The driving gear (23) is coaxially and integrally connected to an adjusting cover (20). The adjusting cover (20) is coaxially rotated and non-separatedly sleeved on the end of the main body ring (19) away from the clips.

10. A cable structure for connecting the inside and outside of a fusion device vacuum chamber according to claim 9, characterized in that, A compressed disc spring (27) is also sandwiched between the adjusting cover (20) and the main ring (19). The end of the adjusting cover (20) away from the clamp has a hexagonal wrench part (2001). The end face of the driven gear (22) has a threaded connector, which is threadedly connected to a locking nut (25). When the locking nut (25) is tightened, the anti-slip pad (26) embedded in its end face is pressed against the outer side of the driving gear (23).

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