High temperature resistant triaxial high voltage vacuum feedthrough structure

Abstract

The present invention relates to a high-temperature baking resistant triaxial high-voltage vacuum feed-in structure, comprising: an inner conductor column, a first end of which is a magnet terminal, the magnet terminal is used to connect the internal excitation coil of the magnet, and a second end of which is a transmission cable inner core terminal, the transmission cable inner core terminal is used to connect the power transmission line; an insulating cylinder, which is sleeved outside the inner conductor column, and its inner wall is fixedly connected to the outer wall of the inner conductor column, and the insulating cylinder is used to withstand high voltage and insulate the inner conductor column and the outer conductor; an outer conductor, which is sleeved outside the insulating cylinder, and its inner side is fixedly connected to the outer wall of the insulating cylinder, and the outer conductor is used to lead out the current loop. The present invention has the characteristics of high temperature resistance, low inductance, high insulation, high voltage resistance, and simple structure.

Description

Technical Field

[0001] The invention relates to the technical field of high-energy heavy ion accelerators, and in particular to a three-coaxial high-pressure vacuum feeding structure resistant to high-temperature baking. Background Art

[0002] As one of the key components of synchrotron accelerator injection and extraction, impact magnets must generate the magnetic field required to kick out the beam in a very short time. At present, with the rapid development of large scientific engineering devices, the theoretical and applied research of magnets is developing in the direction of strong magnetic fields and high current carrying capacity. The development of magnetic components for injection and extraction of beams is extremely important.

[0003] The impact magnet system is mainly composed of a pulse power supply, a transmission line, an impact magnet, a vacuum cylinder, etc. The current generated by the pulse power supply is introduced into the impact magnet coil through the transmission line for excitation. The introduction process places strict requirements on the insulation and high vacuum sealing of the structure.

[0004] The entire excitation coil is placed in an extremely high vacuum to ensure the quality of the beam. To achieve an extremely high vacuum environment, the excitation coil, iron core and other structures in the entire vacuum environment need to be baked. As the feeding structure for the pulse current to be introduced into the excitation coil, it must withstand high-temperature baking to ensure that the vacuum inside the structure reaches the required value. Although the existing structure is a three-coaxial structure, which basically solves the problem of feeding large currents from the atmosphere into the vacuum, its outer conductor and the grounding conductor do not have a stress release structure, and are prone to cracking during the baking process, destroying the vacuum environment. Since the outer conductor disk is welded to the bottom of the insulating ring, it is easy to be detached and damaged by the upper pressure in a vertically installed environment. Therefore, it is very necessary to solve the problem of safe feeding of high voltage and large current in an extremely high vacuum environment, that is, to solve the high-temperature baking resistance and structural stability of the feeding structure.

[0005] The entire excitation coil is placed in an extremely high vacuum to ensure the quality of the beam. To achieve an extremely high vacuum environment, the excitation coil, iron core and other structures in the entire vacuum environment need to be baked. As the feed structure for the pulse current to be introduced into the excitation coil, it must withstand high-temperature baking to ensure that the vacuum inside the structure reaches the required value. Although the existing structure is a three-coaxial structure, which basically solves the problem of large current transmission from the atmosphere to the vacuum, its outer conductor and grounding conductor do not have a stress release structure, and are prone to cracking during the baking process, destroying the vacuum environment. In addition, since the outer conductor disk is welded at the bottom of the insulating ring, it is easy to be detached and damaged by the pressure from the upper part in a vertical installation environment. Summary of the invention

[0006] In view of the above problems, the purpose of the present invention is to provide a three-coaxial high-voltage vacuum feeding structure that is resistant to high temperature baking, so as to simply and effectively solve the problem of large current transmission in a vacuum. The structure of the present invention has the characteristics of high temperature resistance, low inductance, high insulation, high voltage resistance and simple structure.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] The high-temperature baking-resistant triaxial high-voltage vacuum feed-in structure of the present invention comprises: an inner conductor column, a first end of which is a magnet terminal, the magnet terminal is used to connect the excitation coil inside the magnet, and a second end of which is a transmission cable inner core terminal, the transmission cable inner core terminal is used to connect the power transmission line; an insulating cylinder, which is sleeved outside the inner conductor column, and the inner wall of which is fixedly connected to the outer wall of the inner conductor column, the insulating cylinder is used to withstand high voltage and insulate the inner conductor column and the outer conductor; an outer conductor, the outer conductor is sleeved on the insulating cylinder, The outer tube has an inner side fixedly connected to the outer wall of the insulating tube, and the outer conductor is used for leading out the current loop; wherein, the outer conductor comprises an inner tube, an annular structure, an outer tube and an external convex disk, the outer tube is sleeved outside the inner tube and the outer tube and the inner tube are connected through the annular structure, the annular structure is formed by folding the top of the outer tube downward and protruding radially, and the external convex disk is formed by folding the bottom of the outer tube upward and protruding radially, so that an outer tube with a corrugated structure is formed between the inner tube and the external convex disk.

[0009] The high temperature resistant three-coaxial high voltage vacuum feed-in structure preferably further comprises an insulating ring, which is sleeved outside the outer conductor, and whose upper end surface is fixedly connected to the external flange of the outer conductor, and whose lower end surface is used to connect to the grounding conductor ring.

[0010] The high-temperature resistant three-coaxial high-voltage vacuum feed-in structure preferably also includes a grounding conductor ring, which is sleeved outside the insulating ring and is used to ground the equipment; wherein the grounding conductor ring includes an inscribed convex ring, an inner ring body, a connecting ring and an outer ring body, the inscribed convex ring is connected to the lower end surface of the insulating ring, and the inner ring body is connected to the outer ring body via a connecting ring; the inscribed convex ring is formed by folding the top of the inner ring body downward and protruding radially, and the connecting ring is formed by folding the bottom of the inner ring body upward and protruding radially, so that an inner ring body with a corrugated structure is formed between the outer ring body and the inscribed convex ring.

[0011] The high-temperature resistant three-coaxial high-voltage vacuum feed-in structure preferably also includes a vacuum flange, which is sleeved outside the grounding conductor ring, and the inner side of the vacuum flange is fixedly connected to the outer side of the grounding conductor ring, and the vacuum flange is used to fix the entire structure on the equipment.

[0012] The high-temperature-resistant tri-coaxial high-voltage vacuum feed-in structure is preferably provided with screw holes at both ends of the inner conductor column, and the screw holes are used to connect the internal excitation coil of the magnet or the power transmission line to the two ends of the inner conductor column respectively.

[0013] In the high temperature baking resistant tri-coaxial high voltage vacuum feed-in structure, preferably, the insulating cylinder and the insulating ring are both made of ceramic material.

[0014] The present invention adopts the above technical solution, which has the following advantages:

[0015] The present invention has the characteristics of low inductance, high voltage resistance and high insulation, and can effectively solve the problem of fast pulse and large current atmosphere-vacuum transmission. Due to the structural characteristics, the temperature stress generated by thermal expansion during high-temperature baking can be effectively released to protect the ceramic-metal sealing parts. The overall structure is simple and compact, and has strong usability and high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings:

[0017] Figure 1 It is a cross-sectional structural schematic diagram of the present invention;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 3 It is a schematic diagram of the structure of the outer conductor of the present invention;

[0020] Figure 4 It is a schematic diagram of the ground conductor ring structure of the present invention.

[0021] The symbols in the accompanying drawings are as follows:

[0022] 1- vacuum flange; 2- grounding conductor ring; 201- inner convex ring; 202- inner ring body; 203- connecting ring; 204- outer ring body; 3- insulating ring; 4- outer conductor; 401- inner cylinder; 402- annular structure; 403- outer cylinder; 404- external convex disk; 5- insulating cylinder; 6- inner conductor column; 601- screw hole. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0024] The present invention provides a three-coaxial high-voltage vacuum feeding structure resistant to high-temperature baking, in which the outer conductor is designed to be a corrugated structure, which can meet the requirements of low inductance while reducing the overall deformation during high-temperature baking, protect the metal-ceramic welding part, reduce the vacuum leakage rate, and realize the transmission of high voltage and large current from the atmosphere to the vacuum.

[0025] like Figure 1 and Figure 2 As shown, the high-temperature baking-resistant triaxial high-voltage vacuum feed-in structure provided by the present invention comprises: an inner conductor column 6, a first end of which is a magnet terminal, the magnet terminal is used to connect the internal excitation coil of the magnet, and a second end of which is a transmission cable inner core terminal, the transmission cable inner core terminal is used to connect the power transmission line; an insulating cylinder 5, which is sleeved outside the inner conductor column 6, and its inner wall is fixedly connected to the outer wall of the inner conductor column 6, and the insulating cylinder 5 is used to withstand high voltage and insulate the inner conductor column 6 and the outer conductor 4; an outer conductor 4, the outer conductor 4 is sleeved outside the insulating cylinder 5, and its inner side is fixedly connected to the outer wall of the insulating cylinder 5, and the outer conductor 4 is used to lead out the current loop; wherein, as Figure 3 As shown, the outer conductor 4 includes an inner cylinder 401, an annular structure 402, an outer cylinder 403 and an external convex disk 404. The outer cylinder 403 is sleeved outside the inner cylinder 401 and the outer cylinder 403 and the inner cylinder 401 are connected through the annular structure 402. The annular structure 402 is formed by folding the top of the outer cylinder 403 downward and protruding radially. The external convex disk 404 is formed by folding the bottom of the outer cylinder 403 upward and protruding radially, so that a corrugated outer cylinder 403 is formed between the inner cylinder 401 and the external convex disk 404. The corrugated structure is used to release temperature stress during high-temperature baking.

[0026] In the above embodiment, the present invention further includes an insulating ring 3, which is sleeved outside the outer conductor 4, and its upper end surface is fixedly connected to the external flange 404 of the outer conductor 4, and its lower end surface is used to connect to the grounding conductor ring 2, and the insulating ring 3 plays an insulating role.

[0027] In the above embodiment, preferably, the present invention further comprises a grounding conductor ring 2, which is sleeved outside the insulating ring 3 and is used to connect the equipment to the ground; wherein, Figure 4 As shown, the grounding conductor ring 2 includes an inner convex ring 201, an inner ring body 202, a connecting ring 203 and an outer ring body 204. The inner convex ring 201 is connected to the lower end surface of the insulating ring 3, and the inner ring body 202 is connected to the outer ring body 204 through the connecting ring 203; the inner convex ring 201 is formed by folding the top of the inner ring body 202 downward and protruding radially, and the connecting ring 203 is formed by folding the bottom of the inner ring body 202 upward and protruding radially, so that a corrugated inner ring body 202 is formed between the outer ring body 204 and the inner convex ring 201. The corrugated structure here is also used to release temperature stress during high-temperature baking.

[0028] In the above embodiment, preferably, the present invention further includes a vacuum flange 1, which is sleeved outside the grounding conductor ring 2, and the inner side of the vacuum flange 1 is fixedly connected to the outer side of the grounding conductor ring 2, and the vacuum flange 1 is used to fix the entire structure on the equipment.

[0029] In the above embodiment, preferably, screw holes 601 are respectively provided at both ends of the inner conductor column 6 (see Figure 1 ), the screw hole 601 is used to connect the internal excitation coil of the magnet or the power transmission line to the two ends of the inner conductor column 6 respectively.

[0030] In the above embodiment, preferably, the insulating cylinder 5 and the insulating ring 3 are both made of ceramic material.

[0031] It should be noted that during production, ceramic-metal sealing is performed between the inner conductor column 6 and the insulating tube 5; the outer conductor 4 and the grounding conductor ring 2 are respectively ceramic-metal sealed to the insulating ring 3, and after sealing, the outer conductor 4 and the insulating tube 5 are ceramic-metal sealed; finally, the grounding conductor ring 2 and the vacuum flange 1 are argon arc welded together.

[0032] When the present invention is in use, the vacuum flange 1 is fixedly connected to the boundary between the vacuum and the atmosphere, and the circuit wiring in the vacuum and the atmosphere is respectively connected to the two ends of the inner conductor column 6 to realize one current feed-in; the corrugated outer conductor 4 conducts the circuit connection in the vacuum and the atmosphere to realize another current extraction; the grounding conductor ring 2 ensures good conduction between the vacuum and the atmosphere, ensures good grounding performance of the entire magnet device, and plays a positive role in magnet noise reduction.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high temperature resistant three-coaxial high-voltage vacuum feedthrough structure, characterized in that: include: The inner conductor column has a first end which is a magnet terminal, and the magnet terminal is used to connect the excitation coil inside the magnet. The second end is a transmission cable inner core terminal, and the transmission cable inner core terminal is used to connect a power transmission line; An insulating cylinder is sleeved outside the inner conductor column, and its inner wall is fixedly connected to the outer wall of the inner conductor column. The insulating cylinder is used to withstand high voltage and insulate the inner conductor column and the outer conductor; An outer conductor, which is sleeved outside the insulating tube, and whose inner side is fixedly connected to the outer wall of the insulating tube, and is used for leading out the current loop; The outer conductor comprises an inner tube, an annular structure, an outer tube and an external convex disk, wherein the outer tube is sleeved outside the inner tube and the outer tube and the inner tube are connected via the annular structure, the annular structure is formed by folding the top of the outer tube downward and protruding radially, and the external convex disk is formed by folding the bottom of the outer tube upward and protruding radially, so that an outer tube with a corrugated structure is formed between the inner tube and the external convex disk.

2. The high temperature baking resistant tri-coaxial high-voltage vacuum feedthrough structure according to claim 1, characterized in that: It also includes an insulating ring and a grounding conductor ring, wherein the insulating ring is sleeved outside the outer conductor, and its upper end surface is fixedly connected to the outer flange of the outer conductor, and its lower end surface is used to connect to the grounding conductor ring; The grounding conductor ring is sleeved outside the insulating ring and is used for grounding the equipment.

3. The high temperature baking resistant tri-coaxial high-voltage vacuum feedthrough structure according to claim 2, characterized in that: The grounding conductor ring includes an inscribed convex ring, an inner ring body, a connecting ring and an outer ring body. The inscribed convex ring is connected to the lower end surface of the insulating ring, and the inner ring body is connected to the outer ring body via a connecting ring. The inscribed convex ring is formed by folding the top of the inner ring body downward and protruding radially, and the connecting ring is formed by folding the bottom of the inner ring body upward and protruding radially, so that a corrugated inner ring body is formed between the outer ring body and the inscribed convex ring.

4. The high temperature baking resistant tri-coaxial high-voltage vacuum feedthrough structure according to claim 3, characterized in that: It also includes a vacuum flange, which is sleeved outside the grounding conductor ring, and the inner side of the vacuum flange is fixedly connected to the outer side of the grounding conductor ring. The vacuum flange is used to fix the entire structure on the equipment.

5. The high temperature baking resistant tri-coaxial high-voltage vacuum feedthrough structure according to claim 1, characterized in that: The two ends of the inner conductor column are respectively provided with screw holes, and the screw holes are used to connect the internal excitation coil of the magnet or the power transmission line to the two ends of the inner conductor column respectively.

6. The high temperature baking resistant tri-coaxial high-voltage vacuum feedthrough structure according to any one of claims 2 to 4, characterized in that: The insulating cylinder and the insulating ring are both made of ceramic material.

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