Potential isolation mechanism and method of assembly welding thereof

Abstract

The application belongs to the technical field of electric insulation for high pressure of deuterium-tritium radiation in controllable nuclear fusion, and discloses a potential isolation mechanism and a welding method thereof. In the mechanism, the insulation support is sleeved outside the ceramic sleeve; there are two metal bellows, one end of each of the two metal bellows is welded and fixed to two ends of the ceramic sleeve correspondingly; there are two support sections, one end of one of the two support sections is welded to the other end of one of the metal bellows and the other end is fixed to the vacuum chamber, and one end of the other of the two support sections is welded to the other end of the other of the metal bellows and the other end is fixed to the end cover; some adjusting bolts are connected between one of the support sections and the insulation support, and the rest of the adjusting bolts are connected between the other of the support sections and the insulation support. The application can solve the problems of radiation compatibility and potential isolation caused by the cable leading out of the internal high-voltage electrical equipment during deuterium-tritium fusion, and the size can be increased to meet the use requirements of large scientific devices.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric insulation for controllable nuclear fusion involving deuterium-tritium radiation high pressure, and particularly relates to a potential isolation mechanism and a welding method thereof. BACKGROUND

[0002] In the controllable nuclear fusion research, the radiation problem caused by deuterium-tritium fusion will be involved. The radiation dust will fill the entire tokamak and other systems connected therewith. The neutral beam injection system is one of the commonly used methods for auxiliary heating of controllable nuclear fusion. When working, the vacuum chamber of the neutral beam system will be connected with the tokamak main machine. Some radiation dust will enter the inside of the vacuum chamber. There are some high-voltage electrical equipment in the inside of the vacuum chamber of the neutral beam injection system. The cable (i.e. bare metal cable) of the high-voltage electrical equipment needs to be led out to the outside of the vacuum chamber for power connection. Therefore, the cable needs to be electrically isolated from the vacuum chamber so that the vacuum chamber is not electrified. At the same time, the cable leading-out section needs to meet the sealing requirement to avoid radiation overflow.

[0003] Prior to this, there is no deuterium-tritium fusion involved in the devices at home and abroad, such as the Korean K-STAR and the domestic "artificial sun" EAST. In the potential isolation mode, G10 non-metallic material is usually used for electric isolation, and O-shaped rubber ring is used for sealing. These methods cannot meet the future deuterium-tritium fusion radiation compatibility problem. In order to meet the radiation compatibility and sealing problem, some domestic manufacturers have developed some devices, such as the metal-ceramic welding hard sealing method. This method can meet the deuterium-tritium fusion radiation compatibility and potential isolation problem. However, due to the fact that the welding surface of the metal and the ceramic cannot withstand too large bending moment, only a small mechanism can be made, which cannot meet the problem of excessive use of electrical equipment in the future large scientific device. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, one object of the present application is to provide a potential isolation mechanism, which can solve the radiation compatibility and potential isolation problem caused by the cable leading-out of the internal high-voltage electrical equipment during deuterium-tritium fusion. At the same time, it can withstand a larger bending moment, and the outer size can be further increased to meet the use requirement of the large scientific device.

[0005] The potential isolation mechanism according to the first aspect of the present application comprises:

[0006] a ceramic sleeve;

[0007] an insulating support movably sleeved on the outside of the ceramic sleeve;

[0008] two metal bellows arranged on both sides of the ceramic sleeve in the axial direction, and one end of each of the two metal bellows is correspondingly welded and fixed to one end of the ceramic sleeve.

[0009] a support section, wherein one end of the support section is axially welded to the other end of one of the metal bellows, the other end of the support section is used to fix with the vacuum chamber, and the other end of the other support section is axially welded to the other end of the other metal bellows, the other end of the other support section is used to fix with the end cover;

[0010] adjusting bolts, wherein some of the adjusting bolts are connected between the one support section and the insulating support, and the rest of the adjusting bolts are connected between the other support section and the insulating support.

[0011] According to the potential isolation mechanism of the first aspect of the present application, when the neutral beam injection system is working, the high-voltage electrical equipment inside the vacuum chamber needs to be powered on, and after being powered on, the current is connected to the high-voltage electrical equipment through the cable. Because the potential isolation mechanism adopts the mode of welding the metal bellows at both ends of the ceramic sleeve, and the insulating support is connected to the two support sections through the adjusting bolts, the current is isolated at the ceramic sleeve and the insulating support of the potential isolation mechanism, so that the vacuum chamber is not electrified. At the same time, because the potential isolation mechanism does not use a rubber ring, but uses a hard sealing welding mode for sealing, radiation leakage can be avoided.

[0012] The potential isolation mechanism of the first aspect of the present application has the following advantages: first, the ceramic sleeve and the insulating support can effectively isolate the current, so that the vacuum chamber is not electrified; second, the hard sealing welding mode is used for sealing, and the welded weld is not easy to crack, so that radiation leakage can be avoided, and the problem that the rubber sealing ring cannot meet the tritium compatibility problem is solved; third, a greater bending moment can be withstood, and the size can be further increased to meet the use requirements of large scientific devices.

[0013] In some embodiments, an outer convex ring part is arranged on the outer side of the ceramic sleeve, an inner concave ring groove is arranged on the inner side of the insulating support, the outer convex ring part is arranged in the inner concave ring groove, and the outer convex ring part and the inner concave ring groove are axially gap-fitted.

[0014] In some embodiments, the outer convex ring part includes two outer convex ring part end faces and a convex spherical surface connected between the two outer convex ring part end faces; the inner concave ring groove includes two axially opposite groove side wall faces and a groove bottom inner concave spherical surface connected between the two groove side wall faces; the distance between the two outer convex ring part end faces is less than the distance between the two groove side wall faces, and the convex spherical surface is adaptively fitted with the groove bottom inner concave spherical surface.

[0015] In some embodiments, the wall body extending radially inward at both sides of the inner concave ring groove of the insulating support does not contact the ceramic sleeve.

[0016] In some embodiments, the insulating support comprises a plurality of insulating arc-shaped supports, and the plurality of insulating arc-shaped supports are sequentially connected in a circumferential direction to form the insulating support.

[0017] In some embodiments, the insulating arc-shaped supports are two, and the two insulating arc-shaped supports are fixed by a threaded fixing member.

[0018] In some embodiments, the adjusting bolts are alternately staggered in a circumferential direction.

[0019] In some embodiments, the outer sides of the two support segments are respectively provided with annular support plates, and the annular support plates are respectively connected with the adjusting bolts.

[0020] In some embodiments, the other ends of the two support segments are respectively provided with flanges, and the flange of one of the support segments is fixed with a flange of the vacuum chamber, and the flange of the other support segment is fixed with the end cover.

[0021] The second aspect embodiment of the present application provides a method for assembling and welding a potential isolation mechanism, which is the potential isolation mechanism of the first aspect embodiment of the present application, and sequentially comprises the following steps:

[0022] S1: welding one end of each of the two metal bellows on two ends of the ceramic sleeve respectively,

[0023] S2: installing the insulating support on the ceramic sleeve;

[0024] S3: first fixing one of the support segments on the insulating support through the corresponding adjusting bolt, then welding and fixing one end of the one support segment with the other end of one of the metal bellows; and then fixing the other support segment on the insulating support through the corresponding adjusting bolt, and welding and fixing one end of the other support segment with the other end of the other metal bellows.

[0025] Alternatively, first fixing the other support segment on the insulating support through the corresponding adjusting bolt, then welding and fixing one end of the other support segment with the other end of the other metal bellows; and then fixing one of the support segments on the insulating support through the corresponding adjusting bolt, and welding and fixing one end of the one support segment with the other end of one of the metal bellows.

[0026] Since the assembly and welding method of the potential isolation mechanism in the second aspect embodiment of the present invention utilizes the potential isolation mechanism in the first aspect embodiment of the present invention, the assembly and welding method of the potential isolation mechanism in the second aspect embodiment of the present invention has essentially the same technical effect as the potential isolation mechanism in the first aspect embodiment of the present invention, and will not be described again here.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the installation position of the potential isolation mechanism according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the potential isolation mechanism according to an embodiment of the present invention;

[0030] Figure 3 This is a cross-sectional schematic diagram of the potential isolation mechanism according to an embodiment of the present invention;

[0031] Figure 4 yes Figure 3 Enlarged view of point A;

[0032] Figure 5 This is a flowchart of the assembly and welding method of the potential isolation mechanism according to an embodiment of the present invention.

[0033] Figure Labels

[0034] Vacuum chamber 100; High-voltage electrical equipment 200; Potential isolation mechanism 300; Ceramic sleeve 31; Outer convex ring 311; Outer convex ring end face 3111; Convex spherical surface 3112; Insulating bracket 32; Inner concave annular groove 321; Groove side wall 3211; Groove bottom inner concave spherical surface 3212; Insulating arc-shaped bracket 322; Metal corrugated pipe 33; Support section 34; Annular support plate 341; Flange 342; Adjusting bolt 35; End cover 36. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] The following is combined with Figures 1 to 5 This invention describes the potential isolation mechanism 300 and its assembly and welding method according to embodiments of the present invention.

[0037] The potential isolation mechanism 300 of the first aspect of the present invention is applied to high-voltage electrical insulation for controlled nuclear fusion involving deuterium and tritium radiation.

[0038] As Figure 1 shown, the neutral beam injection system is one of the common methods of auxiliary heating of controlled nuclear fusion. When working, the vacuum chamber 100 of the neutral beam injection system penetrates the tokamak main machine, and part of the radiation dust will enter the inside of the vacuum chamber 100. The inside of the vacuum chamber 100 of the neutral beam injection system has part of the high-voltage electrical equipment 200. The cable of the high-voltage electrical equipment 200, that is, the bare metal cable, needs to be led out to the outside of the vacuum chamber 100 to be connected to electricity. Therefore, the cable needs to be electrically isolated from the vacuum chamber 100, so that the vacuum chamber 100 is not electrified. At the same time, the leading-out section of the cable needs to meet the sealing to avoid radiation overflow. The leading-out section of the cable is usually called a potential isolation mechanism 300.

[0039] As Figure 1 and Figure 2 shown, the potential isolation mechanism 300 according to the first aspect of the present application comprises a ceramic sleeve 31, an insulating support 32, a metal bellows 33, a support section 34, and an adjusting bolt 35.

[0040] The insulating support 32 is movably sleeved on the outside of the ceramic sleeve 31, so that the ceramic sleeve 31 and the insulating support 32 can slide relative to each other. Both the ceramic sleeve 31 and the insulating support 32 play a role in isolating the electric potential.

[0041] The metal bellows 33 has two, and the two metal bellows 33 are arranged on both sides of the ceramic sleeve 31 in the axial direction. One end of each of the two metal bellows 33 is correspondingly welded and fixed to one end of the ceramic sleeve 31. Since the metal bellows 33 can be deformed, when the metal bellows 33 is welded with the ceramic sleeve 31, the metal bellows 33 can be deformed adaptively, which can reduce the welding seam cracking between the metal bellows 33 and the ceramic sleeve 31, and achieve better and more stable sealing.

[0042] The support section 34 has two, one end of one of the support sections 34 is welded and fixed to the other end of one of the metal bellows 33 in the axial direction, and the other end of the one of the support sections 34 is used to be fixed to the vacuum chamber 100. One end of the other of the support sections 34 is welded and fixed to the other end of the other of the metal bellows 33 in the axial direction, and the other end of the other of the support sections 34 is fixed to the end cover 36. In this way, the inside of the ceramic sleeve 31, the metal bellows 33, and the support section 34 together form a channel for the line to pass through, the end cover 36 closes the channel at the end away from the vacuum chamber 100, the cable passes through the channel and the cable hole on the end cover 36, and is supported and fixed by the end cover 36. Since the metal bellows 33 can be deformed, when the metal bellows 33 is welded with the support section 34, the welding seam cracking between the metal bellows 33 and the support section 34 can be reduced, and better and more stable sealing can be achieved.

[0043] The adjusting bolts 35 are provided in plurality, and some of the adjusting bolts 35 are connected between one of the support segments 34 and the insulating support 32, and the rest of the adjusting bolts 35 are connected between the other of the support segments 34 and the insulating support 32. In this way, the two support segments 34 are fixed on the insulating support 32 through the adjusting bolts 35, and one of the support segments 34 is fixed on the vacuum chamber 100, so that force transmission can be realized, and the potential isolation mechanism 300 can bear greater bending moment, which can avoid the welding surface between the metal bellows 33 and the ceramic sleeve 31 from being cracked due to excessive bending moment, and can further increase the size of the potential isolation mechanism 300.

[0044] According to the potential isolation mechanism 300 of the first aspect of the present application, when the neutral beam injection system is in operation, the high-voltage electrical equipment 200 inside the vacuum chamber 100 needs to be powered on, and after being powered on, the current is connected to the high-voltage electrical equipment 200 through the cable. Since the potential isolation mechanism 300 adopts the mode of welding the metal bellows 33 at both ends of the ceramic sleeve 31, and the insulating support 32 is connected to the two support segments 34 through the adjusting bolts 35, respectively, the current can be isolated at the ceramic sleeve 31 and the insulating support 32 of the potential isolation mechanism 300, so that the vacuum chamber 100 is not electrified. At the same time, since the potential isolation mechanism 300 does not use a rubber ring, but adopts a hard sealing welding mode, radiation leakage can be avoided.

[0045] The potential isolation mechanism 300 of the first aspect of the present application has the following advantages: first, the ceramic sleeve 31 and the insulating support 32 can effectively isolate the current, so that the vacuum chamber 100 is not electrified; second, the hard sealing welding mode is adopted, and the welded seam is not easy to crack, so that radiation leakage can be avoided, and the problem that the rubber sealing ring cannot meet the tritium compatibility requirement is solved; third, the potential isolation mechanism 300 can bear greater bending moment, and the size can be further increased to meet the use requirement of the large scientific device.

[0046] In some embodiments, the outer side of the ceramic sleeve 31 is provided with an outer convex ring part 311, the inner side of the insulating support 32 is provided with an inner concave ring groove 321, the outer convex ring part 311 is arranged in the inner concave ring groove 321, and the outer convex ring part 311 and the inner concave ring groove 321 are in clearance fit in the axial direction. In this way, the ceramic sleeve 31 can be self-adaptively slid in the insulating support 32, and the welded seam between the ceramic sleeve 31 and the metal bellows 33 can be avoided from being cracked.

[0047] In some embodiments, the outer convex ring part 311 comprises two outer convex ring part end faces 3111 and a convex spherical surface 3112 connected between the two outer convex ring part end faces 3111; the inner concave ring groove 321 comprises two axially opposite groove side wall faces 3211 and a groove bottom concave spherical surface 3212 connected between the two groove side wall faces 3211; the distance between the two outer convex ring part end faces 3111 is smaller than the distance between the two groove side wall faces 3211, and the convex spherical surface 3112 and the groove bottom concave spherical surface 3212 are adapted to each other. In this way, the ceramic sleeve 31 can be adaptively slid inside the insulating support 32, avoiding the welding seam between the ceramic sleeve 31 and the metal bellows 33 from cracking.

[0048] In some embodiments, the insulating support 32 does not contact the ceramic sleeve 31 at the wall bodies extending radially inward at both sides of the inner concave ring groove 321, avoiding interference when the ceramic sleeve 31 and the insulating support 32 slide relative to each other.

[0049] In some embodiments, the insulating support 32 comprises a plurality of insulating arc-shaped supports 322, and the plurality of insulating arc-shaped supports 322 are sequentially connected in a circumferential direction to form the insulating support 32. In this way, the insulating support 32 is easy to install.

[0050] In some embodiments, the insulating arc-shaped support 322 has two, and the two insulating arc-shaped supports 322 are fixed by threaded fasteners. In this way, the insulating support 32 is easy and fast to install.

[0051] In some embodiments, the partial adjusting bolts 35 and the remaining adjusting bolts 35 are sequentially and alternately staggered in the circumferential direction, so that the adjusting bolts 35 on both sides of the insulating support 32 can stabilize and support while being isolated from the potential on both sides of the insulating support 32 due to the staggering.

[0052] In some embodiments, the outer sides of the two support sections 34 are respectively provided with annular support plates 341, and the annular support plates 341 are respectively connected with the corresponding adjusting bolts 35. The annular support plates 341 can better fix the adjusting bolts 35.

[0053] In some embodiments, the other ends of the two support sections 34 are respectively provided with flanges 342, one of the flanges 342 of the two support sections 34 is fixed with the flange 342 of the vacuum chamber 100, and the other of the flanges 342 of the two support sections 34 is fixed with the end cover 36. By providing the flanges 342, the connection is convenient and reliable. The specific structure of the flange 342 is not limited and can be adjusted according to needs.

[0054] The second aspect of the application also proposes a method for assembling and welding a potential isolation mechanism 300, which is the potential isolation mechanism 300 of the first aspect of the application.

[0055] As Figures 1 to 5As shown, the assembling and welding method of the potential isolation mechanism 300 according to the second aspect of the present application comprises the following steps in sequence:

[0056] S1: Weld one end of each of the two metal bellows 33 on the two ends of the ceramic sleeve 31 respectively.

[0057] S2: Install the insulating support 32 on the ceramic sleeve 31.

[0058] S3: First, fix one of the support segments 34 on the insulating support 32 through the corresponding adjusting bolt 35, and then weld and fix one end of the one of the support segments 34 with the other end of one of the metal bellows 33; then, fix the other of the support segments 34 on the insulating support 32 through the corresponding adjusting bolt 35, and then weld and fix one end of the other of the support segments 34 with the other end of the other of the metal bellows 33.

[0059] Alternatively, first, fix the other of the support segments 34 on the insulating support 32 through the corresponding adjusting bolt 35, and then weld and fix one end of the other of the support segments 34 with the other end of the other of the metal bellows 33; then, fix the one of the support segments 34 on the insulating support 32 through the corresponding adjusting bolt 35, and then weld and fix one end of the one of the support segments 34 with the other end of one of the metal bellows 33.

[0060] Through steps S1 to S3, the potential isolation mechanism 300 according to the first aspect of the present application can be obtained.

[0061] The assembling and welding method of the potential isolation mechanism 300 according to the second aspect of the present application has basically the same technical effects as the first aspect of the present application, and will not be described here.

[0062] The potential isolation mechanism and the assembling and welding method thereof according to the present application can solve the radiation compatibility and potential isolation problem caused by the cable leading out of the internal high-voltage electrical equipment 200 during deuterium-tritium fusion. Since the hard sealing welding method is adopted, the problem that the rubber sealing ring cannot meet the tritium compatibility is solved. At the same time, the assembling and welding method can reduce the influence on the ceramic-metal welding surface, can withstand a larger bending moment, and the outer size can be further increased to meet the use requirements of large scientific devices.

[0063] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A potential isolation mechanism, characterized in that, include: Ceramic sleeve; An insulating support is movably fitted onto the outside of the ceramic sleeve; The device includes two metal bellows arranged axially on both sides of the ceramic sleeve, with one end of each metal bellows welded and fixed to both ends of the ceramic sleeve. The support section has two parts. One end of one of the support sections is welded and fixed axially to the other end of one of the metal bellows. The other end of the support section is used to fix it to the vacuum chamber. One end of the other support section is welded and fixed axially to the other end of the other metal bellows. The other end of the other support section is used to fix it to the end cap. Adjusting bolts, wherein there are multiple adjusting bolts, some of which are connected between one of the support sections and the insulating bracket, and the remaining adjusting bolts are connected between another of the support sections and the insulating bracket; The outer side of the ceramic sleeve is provided with an outwardly protruding ring portion, and the inner side of the insulating bracket is provided with an inwardly concave ring groove. The outwardly protruding ring portion is disposed in the inwardly concave ring groove, and the outwardly protruding ring portion and the inwardly concave ring groove are in axial clearance fit. The convex ring portion includes two convex ring end faces and a convex spherical surface connected between the two convex ring end faces; the concave ring groove includes two axially opposite groove sidewalls and a groove bottom concave spherical surface connected between the two groove sidewalls; the distance between the two convex ring end faces is less than the distance between the two groove sidewalls, and the convex spherical surface is adapted to fit the groove bottom concave spherical surface; The insulating support wall, which extends radially inward at both sides of the concave annular groove, does not contact the ceramic sleeve.

2. The potential isolation mechanism according to claim 1, characterized in that, The insulating support includes multiple insulating arc-shaped supports, which are connected end to end in the circumferential direction to form the insulating support.

3. The potential isolation mechanism according to claim 2, characterized in that, There are two insulating arc-shaped brackets, and the two insulating arc-shaped brackets are fixed by threaded fasteners.

4. The potential isolation mechanism according to claim 1, characterized in that, Some of the adjusting bolts are staggered alternately with the rest of the adjusting bolts in the circumferential direction.

5. The potential isolation mechanism according to claim 1, characterized in that, Annular support plates are provided on the outer sides of the two support sections, and the annular support plates are respectively connected to the corresponding adjusting bolts.

6. The potential isolation mechanism according to claim 1, characterized in that, The other ends of the two support sections are respectively provided with flanges, wherein the flange of one support section is fixed to the flange of the vacuum chamber, and the flange of the other support section is fixed to the end cover.

7. A method for assembling and welding a potential isolation mechanism as described in claim 1, characterized in that, The steps are as follows: S1: Weld one end of each of the two metal bellows to the two ends of the ceramic sleeve respectively. S2: Install the insulating bracket on the ceramic sleeve; S3: First, fix one of the support segments to the insulating bracket using the corresponding adjusting bolts, then weld one end of one of the support segments to the other end of one of the metal bellows; then fix the other support segment to the insulating bracket using the corresponding adjusting bolts, then weld one end of the other support segment to the other end of the other metal bellows. Alternatively, one of the supporting sections can be fixed to the insulating bracket first using the corresponding adjusting bolt, and then one end of the other supporting section can be welded to the other end of the other metal bellows; then, one of the supporting sections can be fixed to the insulating bracket first using the corresponding adjusting bolt, and then one end of the supporting section can be welded to the other end of the other metal bellows.

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