Shading plate rotating shaft protection device suitable for strong electromagnetic and high vacuum environment

Abstract

The invention discloses a shading plate rotating shaft protection device suitable for a strong electromagnetic high-vacuum environment, and relates to the technical field of magnetic confinement nuclear fusion. The device comprises a reflector shading barrel, a shading plate, a rotating shaft and a rotating shaft protection piece, a connecting seat is arranged on the outer wall of the reflector shading barrel, a groove is inwards formed in the end face of the connecting seat, an insulating sleeve is arranged in the groove, a metal lantern ring is arranged in the insulating sleeve, and the rotating shaft protection piece is arranged in the metal lantern ring. The end face of the connecting base is provided with a protective sleeve concentrically aligned with the metal lantern ring, one end of the rotating shaft penetrates through the protective sleeve to be rotationally connected with the metal lantern ring, the light shielding plate is connected with the rotating shaft, and the rotating shaft is rotated forwards or reversely to enable the light shielding plate to shield light or not shield light. The shading plate rotating shaft protection device suitable for the strong electromagnetic high-vacuum environment has the beneficial effects that the fault occurrence rate of the shading plate in the strong electromagnetic high-vacuum environment is reduced, the service life is prolonged, and normal operation of an experiment is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic confinement nuclear fusion, and in particular to a visor shaft protection device suitable for a strong electromagnetic high vacuum environment. Background Art

[0002] For vacuum devices, shading plates are often used to protect glass observation windows. In magnetic confinement fusion devices, there are many structural components inside the vacuum chamber, which will block the field of view of the glass observation window. In order to expand the field of view, it is often necessary to set a reflector inside the vacuum chamber. Therefore, the shading plate also needs to extend into the vacuum chamber to protect the reflector as the first mirror in the optical path.

[0003] However, as the shaft of the light shield is extended and goes deeper into the vacuum chamber, its stability decreases and it is more susceptible to the complex environment inside the device. For example, when the device is glow-cleaned, the surface of the components close to the plasma will be coated. If the moving part of the shaft is coated, it is easy for the shaft to get stuck. During plasma discharge with auxiliary heating such as neutral beams, a large number of high-energy particles may bombard the structure facing the plasma, causing changes in the surface material structure. Therefore, existing light shields, especially their shafts, are prone to failure, which often affects the normal progress of experiments. In addition, since the magnetic confinement fusion device has a strong electromagnetic field (the maximum toroidal magnetic field strength of the HL-3 device is 3T, and the maximum plasma current is 3MA) and a high vacuum degree (10 -6 Pa). Therefore, there are strict restrictions on the materials of components entering the vacuum chamber, resulting in the common shading plate structure on the market being unable to be used in this environment.

[0004] Therefore, the prior art needs to be improved. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the shading plate in the prior art, especially its rotating shaft, is prone to failure and has a short service life in a strong electromagnetic and high vacuum environment. The purpose is to provide a shading plate rotating shaft protection device suitable for a strong electromagnetic and high vacuum environment, which adopts corresponding technical means and has the beneficial effects of reducing the failure rate, extending the service life and ensuring the normal progress of the experiment.

[0006] The present invention is achieved through the following technical solutions:

[0007] A sunshade shaft protection device suitable for strong electromagnetic and high vacuum environments, comprising a reflector sunshade tube, a sunshade plate and a shaft, the outer wall of the reflector sunshade tube is provided with a connecting seat, the end surface of the connecting seat is provided with a groove inwardly, an insulating sleeve is provided in the groove, a metal ring is provided in the insulating sleeve, the end surface of the connecting seat is provided with a protective sleeve concentrically aligned with the metal ring, one end of the shaft passes through the protective sleeve and is rotatably connected to the metal ring, the sunshade plate is connected to the shaft, and the shaft is rotated forward or reversely so that the sunshade plate blocks light or does not block light.

[0008] In the above technical solution, the shading plate needs to be opened during the experiment to facilitate the reflector shading tube to receive the light signal, and the shading plate needs to be closed during the non-experimental period to protect the reflector installed in the reflector shading tube. The insulating sleeve does not have a conductive effect to disconnect the closed loop formed by the reflector shading tube, the connecting seat, the rotating shaft, and the shading plate to prevent the electromagnetic effect from causing structural damage to the shading plate during the magnetic confinement plasma discharge experiment.

[0009] Furthermore, in the present invention, the shading plate comprises a blade body and a connecting frame, the blade body is adapted to the opening of the reflector shading tube, one end of the connecting frame is connected to the blade body, and the other end of the connecting frame is connected to the rotating shaft.

[0010] Furthermore, in the present invention, the other end of the connecting frame is connected with a pipe sleeve, and the pipe sleeve is sleeved on the rotating shaft.

[0011] Furthermore, in the present invention, the above-mentioned connecting frames are provided in plurality, at least one of the connecting frames is connected to the edge of the blade body, and at least one of the connecting frames is connected to the top surface of the blade body.

[0012] Furthermore, in the present invention, the end of the rotating shaft away from the connecting seat is connected with a conversion sleeve.

[0013] Furthermore, in the present invention, the connection seat is provided with a mounting hole, and the protective sleeve is provided with a connection pin inserted into the mounting hole.

[0014] Furthermore, in the present invention, the metal ring and the rotating shaft are made of different metal materials.

[0015] Furthermore, in the present invention, the metal ring is configured as a metal molybdenum ring, and the rotating shaft is configured as a non-magnetic stainless steel rotating shaft.

[0016] Furthermore, in the present invention, the insulating sleeve is configured as a polyimide sleeve.

[0017] Furthermore, in the present invention, the protective sleeve is configured as a non-magnetic stainless steel sleeve.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1. The insulating sleeve does not have a conductive effect, so as to disconnect the closed loop formed by the reflector shading tube, the connecting seat, the rotating shaft, and the shading plate, thereby preventing electromagnetic induction from causing structural damage to the shading plate in a strong electromagnetic environment. Therefore, the shading plate rotating shaft protection device suitable for a strong electromagnetic high vacuum environment of the present invention has the advantage of extending the service life of the shading plate.

[0020] 2. Since the insulating sleeve is made of polyimide, it is easy to wear due to long-term friction with the non-magnetic stainless steel shaft, so a metal ring is added between the insulating sleeve and the shaft. The metal ring is a part that is in direct contact with the stainless steel shaft and is made of molybdenum. In addition to better wear resistance, it can also prevent the diffusion welding effect of the same metal in long-term contact under a high vacuum environment, and avoid the shaft of the visor from getting stuck due to this reason.

[0021] 3. In order to meet the material restrictions of the sunshade shaft protection device suitable for strong electromagnetic and high vacuum environments, and to reduce the failure rate by simplifying the structure, a metal ring is used to replace the conventional bearing as a component in direct contact with the shaft, so as to provide a limiting effect for the shaft and the sunshade of the cantilever structure. When the shaft is stationary, the protective sleeve provides a support function for the lower limit to prevent the shaft from falling; when the shaft rotates, it provides a lateral limit within the entire stroke range to limit the swing amplitude of the shaft and the sunshade of the cantilever structure during the rotation process. The metal ring is supplemented with an insulating sleeve and a protective sleeve to isolate electromagnetic induction and reduce environmental impact. Therefore, the sunshade shaft protection device suitable for strong electromagnetic and high vacuum environments of the present invention has the advantage of extending the service life of the sunshade. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 It is a schematic diagram of a visor shaft protection device suitable for a strong electromagnetic high vacuum environment of the present invention;

[0024] Figure 2 It is a front schematic diagram of the connecting socket of the present invention.

[0025] The marks and corresponding parts names in the accompanying drawings are: 1-reflector shading tube, 101-opening, 2-shading plate, 201-blade body, 202-connecting frame, 2021-pipe sleeve, 3-connecting seat, 301-groove, 302-mounting hole, 4-insulating sleeve, 5-metal ring, 6-protective sleeve, 7-rotating shaft, 701-adapter sleeve. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments and drawings. The schematic implementation mode of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention. The following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "install", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] Example 1

[0029] Combination Figure 1 to Figure 2 As shown, a shading plate shaft protection device suitable for a strong electromagnetic high vacuum environment according to Example 1 of the present invention is shown, and the specific structure is described as follows.

[0030] Combination Figure 1 As shown, the shading plate shaft protection device of this embodiment suitable for strong electromagnetic high vacuum environment is mainly composed of four parts: a reflector shading tube 1, a shading plate 2, a connecting seat 3, and a shaft 7. Among them, the reflector shading tube 1 is the installation position of the shading plate 2 inside the vacuum chamber of the magnetic confinement device. The function of the shading plate 2 is to close when necessary to protect the reflector in the reflector shading tube 1. The connecting seat 3 is used to support the rotation of the shaft 7. The shaft 7 is used to connect the reflector shading blade 2. The reflector shading blade 2 is used to block or open the opening 101 of the reflector shading tube 1.

[0031] Furthermore, the reflector light-shielding tube 1 is in the form of a cylinder, one end of which is closed and the other end is a tube mouth and is provided with a flange. The reflector is installed inside the tube, and an opening 101 aligned with the reflector is opened on the surface of the reflector light-shielding tube 1.

[0032] In some implementations of this embodiment, Figure 1 and Figure 2 As shown, the connection seat 3 is a metal connection seat 3 in the shape of a "convex" character, and is cast from non-magnetic stainless steel in the prior art. The edges and corners of the connection seat 3 are rounded to reduce stress concentration. The bottom of the connection seat 3 is fixedly connected to the outer wall of the reflector light shielding tube 1.

[0033] Further, such as Figure 2 As shown, a groove 301 extending inward is provided on the end surface of the connection base 3, and the cross section of the groove 301 is circular. The insulating sleeve 4 is fixedly installed inside the groove 301, and the metal ring 5 is fixedly installed inside the insulating sleeve 4.

[0034] Combination Figure 1 As shown, the rotating shaft 7 is a metal round tube made of non-magnetic stainless steel. One end of the rotating shaft 7 is inserted into the inside of the metal collar 5, and the other end can be connected to the driving device outside the vacuum chamber through the adapter sleeve 701, that is, outside the vacuum chamber, the rotating shaft 7 can be rotated by mechanical means (such as driven by a motor or a mechanical arm). And a protective sleeve 6 is fixedly connected to the end face of the connecting seat 3, and the circular shape of the protective sleeve 6 is aligned with the center of the circle of the metal collar 5. The rotating shaft 7 passes through the protective sleeve 6, and the inner diameter of the protective sleeve 6 is slightly larger than the outer diameter of the rotating shaft 7. It mainly plays a shielding role to prevent the rotating shaft 7 and the metal collar 5 from being stuck due to plasma coating. The metal collar 5 also plays a limiting role, by limiting the sagging and shaking range of the front end of the rotating shaft 7, the force on the end of the rotating shaft 7 is reduced.

[0035] The working principle of the visor shaft protection device suitable for strong electromagnetic high vacuum environment of this embodiment is as follows: the shaft 7 and the visor 2 are rotated by a manual tool or a mechanical tool. When the visor 2 is rotated upward, it plays an opening role, exposing the opening 101 of the reflector visor tube 1. When the visor 2 is rotated downward, it plays a closing role, shielding the opening 101 of the reflector visor tube 1. Since the insulating sleeve 4 does not have a conductive effect, the closed loop formed by the reflector visor tube 1, the connecting seat 3, the shaft 7, and the visor 2 can be disconnected, so as to prevent the visor 2 from structural damage due to electromagnetic effects during the magnetic confinement plasma discharge experiment, reduce the probability of failure, and avoid frequent maintenance affecting the normal progress of the experiment. When in use, the shaft 7 can rotate in the forward direction (toward the opening 101) or the reverse direction (away from the opening 101), thereby driving the visor 2 to shield or not shield, and the use effect is better and the service life is extended.

[0036] Example 2

[0037] The shading plate shaft protection device of this embodiment suitable for strong electromagnetic high vacuum environment is improved on the basis of the embodiment 1, and the structure of the shading plate 2 is further refined.

[0038] Combination Figure 1 As shown, the shading plate 2 of this embodiment mainly includes two parts: a blade body 201 and a connecting frame 202. The blade body 201 is a curved plate adapted to fit the opening 101 of the reflector shading tube 1. In this embodiment, two connecting frames 202 are provided. The connecting frame 202 located at the lower side is in the shape of a plate, and the connecting frame 202 located at the upper side is in the shape of a frame. The plate-shaped connecting frame 202 is fixedly connected to the side of the blade body 201, and the frame-shaped connecting frame 202 is fixedly connected to the top surface of the blade body 201.

[0039] Further, such as Figure 1 As shown, the two connecting frames 202 are fixedly connected to the pipe sleeve 2021 on one side away from the blade body 201. The pipe sleeve 2021 is sleeved on the rotating shaft 7 and fixedly connected by three screws.

[0040] It should be noted that if Figure 1 As shown, a transfer sleeve 701 is provided at the left end of the rotating shaft 7 (i.e., the end away from the connecting seat 3). The transfer sleeve 701 is fixedly connected to the rotating shaft 7, and its function is to realize the transmission connection between the rotating shaft 7 of the light shielding plate 2 in the vacuum chamber and the vacuum feed-through rotating shaft of the driving mechanism outside the vacuum chamber. The transfer sleeve 701 is also connected to the driving mechanism so as to drive the rotating shaft 7 to rotate from outside the vacuum chamber. Preferably, the driving mechanism can be a cylinder.

[0041] Example 3

[0042] The shading plate shaft protection device of this embodiment suitable for strong electromagnetic and high vacuum environments is improved on the basis of the embodiment 1, and a fixing method for the protection sleeve 6 is added.

[0043] Combination Figure 1 and Figure 2 As shown, the protective sleeve 6 and the connecting seat 3 can be fixed by screws. The connecting seat 3 is provided with three mounting holes 302 evenly distributed around the groove 301, and the end surface of the protective sleeve 6 is provided with screw holes aligned with the mounting holes 302. The connecting nails pass through the mounting holes 302 and are inserted into the screw holes to achieve fixed connection. In this embodiment, the protective sleeve 6 is fixed by the connecting nails, which has the beneficial effect of being very convenient to install and disassemble, and is more practical.

[0044] Example 4

[0045] The shading plate shaft protection device of this embodiment suitable for strong electromagnetic high vacuum environment is improved on the basis of the first embodiment.

[0046] The metal ring 5 and the rotating shaft 7 are made of different metal materials to avoid the diffusion welding effect of the same metal materials in long-term contact under a high vacuum environment, thereby extending the service life of the light shield 2. The insulating sleeve 4 is made of a polyimide sleeve, and the rotating shaft 7 is made of a non-magnetic stainless steel rotating shaft. The metal ring 5 is made of a metal molybdenum ring. The protective sleeve 6 is made of a non-magnetic stainless steel sleeve and does not directly contact the rotating shaft 7.

[0047] In summary, the present invention provides a shading plate shaft protection device suitable for a strong electromagnetic high vacuum environment, which includes a reflector shading tube 1, a shading plate 2 and a shaft 7. The outer wall of the reflector shading tube 1 is provided with a connecting seat 3, and a groove 301 is provided inwardly on the end surface of the connecting seat 3. An insulating sleeve 4 is provided in the groove 301, and a metal collar 5 is provided in the insulating sleeve. The end surface of the connecting seat 3 is provided with a protective sleeve 6 that is concentrically aligned with the metal collar 5. One end of the shaft 7 passes through the protective sleeve 6 and is rotatably connected to the metal collar 5. The shading plate 2 is connected to the shaft 7. The shaft 7 is rotated forward or backward so that the shading plate 2 blocks light or does not block light. The shading plate 2 includes a blade body 201 and a connecting frame 202. The blade body 201 is adapted to the opening 101 of the reflector shading tube 1. One end of the connecting frame 202 is connected to the blade body 201, and the other end of the connecting frame 202 is connected to the shaft 7. The other end of the connecting frame 202 is connected to a pipe sleeve 2021, which is sleeved on the rotating shaft 7, and the pipe sleeve 2021 is fixed to the rotating shaft 7 by screws. The end of the rotating shaft 7 away from the connecting seat 3 is connected to the adapter sleeve 701. The connecting seat 3 is provided with a mounting hole 302, and the protective sleeve 6 is provided with a connecting pin inserted into the mounting hole 302. The metal ring 5 and the rotating shaft 7 are not made of the same metal material. The insulating sleeve 4 is configured as a polyimide sleeve, and the rotating shaft 7 is configured as a non-magnetic stainless steel rotating shaft. The metal ring 5 is configured as a metal molybdenum ring. The protective sleeve 6 is configured as a non-magnetic stainless steel sleeve. Therefore, the sunshade rotating shaft protection device suitable for a strong electromagnetic high vacuum environment of the present invention has the beneficial effects of reducing the failure rate of the sunshade 2, extending the service life, and ensuring the normal conduct of the experiment.

[0048] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A visor shaft protection device suitable for strong electromagnetic high vacuum environment, characterized in that: The invention comprises a reflector light-shielding tube (1), a light-shielding plate (2) and a rotating shaft (7); the outer wall of the reflector light-shielding tube (1) is provided with a connecting seat (3); the end surface of the connecting seat (3) is provided with a groove (301) inwardly; an insulating sleeve (4) is provided in the groove (301); a metal sleeve (5) is provided in the insulating sleeve (4); the end surface of the connecting seat (3) is provided with a protective sleeve (6) which is concentrically aligned with the metal sleeve (5); one end of the rotating shaft (7) passes through the protective sleeve (6) and is rotatably connected to the metal sleeve (5); the light-shielding plate (2) is connected to the rotating shaft (7); the rotating shaft (7) is rotated in the forward or reverse direction so that the light-shielding plate (2) blocks light or does not block light.

2. The shading plate shaft protection device suitable for strong electromagnetic and high vacuum environments according to claim 1 is characterized in that: The shading plate (2) comprises a blade body (201) and a connecting frame (202); the blade body (201) is adapted to the opening (101) of the reflector shading tube (1); one end of the connecting frame (202) is connected to the blade body (201); and the other end of the connecting frame (202) is connected to the rotating shaft (7).

3. The shading plate shaft protection device suitable for strong electromagnetic and high vacuum environments according to claim 2 is characterized in that: The other end of the connecting frame (202) is connected to a pipe sleeve (2021), and the pipe sleeve (2021) is sleeved on the rotating shaft (7).

4. The shading plate shaft protection device suitable for strong electromagnetic and high vacuum environments according to claim 2 is characterized in that: A plurality of the connecting frames (202) are provided, at least one of the connecting frames (202) is connected to the edge of the blade body (201), and at least one of the connecting frames (202) is connected to the top surface of the blade body (201).

5. The shading plate shaft protection device suitable for strong electromagnetic and high vacuum environments according to claim 1 is characterized in that: The end of the rotating shaft (7) away from the connecting seat (3) is connected to a switching sleeve (701).

6. The shading plate shaft protection device suitable for strong electromagnetic and high vacuum environments according to claim 1 is characterized in that: The connection seat (3) is provided with a mounting hole (302), and the protection sleeve (6) is provided with a connection pin inserted into the mounting hole (302).

7. The shading plate shaft protection device suitable for strong electromagnetic and high vacuum environments according to any one of claims 1 to 6, characterized in that: The metal ring (5) and the rotating shaft (7) are made of different metal materials.

8. The shading plate shaft protection device suitable for strong electromagnetic and high vacuum environments according to claim 7, characterized in that: The metal ring (5) is configured as a metal molybdenum ring, and the rotating shaft (7) is configured as a non-magnetic stainless steel rotating shaft (7).

9. The shading plate shaft protection device suitable for strong electromagnetic and high vacuum environments according to claim 7, characterized in that: The insulating sleeve (4) is configured as a polyimide sleeve.

10. The shading plate shaft protection device suitable for strong electromagnetic and high vacuum environments according to any one of claims 1 to 6, characterized in that: The protective sleeve (6) is configured as a non-magnetic stainless steel sleeve.

Images