A high voltage RF coaxial vacuum through-wall piece

Abstract

The application discloses a high-voltage radio frequency coaxial vacuum wall-penetrating piece, which is characterized by comprising a welding assembly, an inner conductor, an inner conductor adapter, an insulating piece, an outer shell and a threaded ring; the welding assembly comprises a flange, a welding inner conductor and a ceramic piece; the ceramic piece is provided with a through hole matched with the welding inner conductor, the lower end of the welding inner conductor is inserted into the through hole and is fixedly sealed with the ceramic piece; the ceramic piece is fixedly and sealingly connected with the flange; the flange is in contact with the upper end of the outer shell, the inner conductor and the inner conductor adapter are located in the center of the insulating piece and the outer shell, the upper end of the inner conductor is connected with the lower end of the welding inner conductor, and the lower end is connected with the inner conductor adapter; the insulating piece is arranged between the inner conductor, the inner conductor adapter and the outer shell; and the threaded ring is connected with the lower end of the outer shell and is used for pressing the insulating piece. The wall-penetrating piece can meet the requirements of low loss in high-vacuum, high-voltage and pulse power matching transmission, and is suitable for a radiation environment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electric vacuum, and relates to a high-voltage radio frequency coaxial vacuum wall-penetrating piece for power transmission between the inside and outside of a vacuum on a high-voltage device. BACKGROUND

[0002] At present, the wall-penetrating pieces used on high-voltage devices only have the function of vacuum high-voltage wall-penetration, and wall-penetrating pieces integrating high vacuum, high-voltage resistance, wide frequency band, low pulse power loss and radiation resistance have not been reported in the field in China.

[0003] The most similar to the present application is a high-voltage vacuum wall-penetrating piece with ceramic-metal sealing disclosed in the patent document with the publication number CN201174556Y, which mainly has the function of high-voltage resistance and realizes vacuum wall-penetration. However, it cannot solve the problems of pulse power loss in the wall-penetration process and the working of the wall-penetrating piece in a radiation environment. SUMMARY

[0004] The present application aims to provide a high-voltage radio frequency coaxial vacuum wall-penetrating piece, which meets the requirements of high vacuum, high-voltage resistance, low loss in pulse power matching transmission, and is suitable for use in a radiation environment.

[0005] The technical scheme of the present application is as follows:

[0006] A high-voltage radio frequency coaxial vacuum wall-penetrating piece, characterized in that it comprises a welding assembly 1, an inner conductor 2, an inner conductor adapter 3, an insulating piece 4, an outer shell 5 and a threaded ring 6; wherein

[0007] The welding assembly 1 comprises a flange 11, a welding inner conductor 12 and a ceramic piece 13; the ceramic piece 13 is provided with a through hole matched with the welding inner conductor 12, the lower end of the welding inner conductor 12 is inserted into the through hole and fixedly sealed with the ceramic piece 13; the ceramic piece 13 is fixedly and sealingly connected with the flange 11;

[0008] The flange 11 of the welding assembly 1 is in contact with the upper end of the outer shell 5, the inner conductor 2 and the inner conductor adapter 3 are located in the center of the insulating piece 4 and the outer shell 5, the upper end of the inner conductor 2 is connected with the lower end of the welding inner conductor 12, the lower end of the inner conductor 2 is connected with the inner conductor adapter 3, and the welding inner conductor 12, the inner conductor 2 and the inner conductor adapter 3 combine to form the inner conductor of the wall-penetrating piece;

[0009] The insulating piece 4 is assembled between the inner conductor 2, the inner conductor adapter 3 and the outer shell 5; the threaded ring 6 is connected with the lower end of the outer shell 5 and presses the insulating piece 4; and the flange 11, the outer shell 5 and the threaded ring 6 combine to form the outer conductor of the wall-penetrating piece.

[0010] Further, the ceramic piece 13 is flat-bottomed V-shaped structure, and a through hole is arranged in the center of the bottom of the ceramic piece 13 and matches the inner conductor 12 of the welding piece.

[0011] Further, one end of the insulating piece 4 is a flared mouth structure matching the ceramic piece 13, and the other end is a groove structure designed to increase the creepage distance.

[0012] Further, the upper end of the inner conductor adapter 3 is connected with the inner conductor 2 through screwing, and the lower end of the inner conductor adapter 3 is an elastic plug structure and is used for connecting with a cable.

[0013] Further, the upper end of the inner conductor adapter 3 is connected with the inner conductor 2 through screwing, and the lower end of the inner conductor adapter 3 is an elastic plug structure and is used for connecting with a cable.

[0014] Further, the ceramic piece 3 is 99% alumina ceramic.

[0015] Further, the insulating piece 4 is polyether ether ketone (PEEK) material.

[0016] Further, the mechanical size of each structure part is designed according to the relative dielectric constant of alumina ceramic and polyether ether ketone and the characteristic impedance of 50Ω coaxial structure.

[0017] Compared with the prior art, the positive effects of the present application are:

[0018] Through tests, the static vacuum degree of the vacuum inner part of the wall-penetrating piece is better than 4×10 -8 Pa, the vacuum leakage rate of the welding assembly is better than 3×10 -12 Pa·m 3 / s. The special shape structure of the ceramic piece and the insulating piece in the wall-penetrating piece can make the inner conductor and the outer conductor bear 8kV DC high voltage in air and transmit a fast pulse with a pulse width less than 20ns, a pulse edge less than 1ns and a peak high voltage of 20kV in vacuum. The structure form, mechanical size and structure cooperation between the parts of the wall-penetrating piece can realize low-loss transmission of pulse power, and the standing wave ratio is less than 1.5 below 1GHz, the insertion loss S 21 is less than 0.4dB; the standing wave ratio is less than 1.8 below 3GHz, and the insertion loss S 21 is less than 0.8dB. The wall-penetrating piece uses polyether ether ketone (PEEK) material as the insulating medium material, which has low dielectric constant and good high-temperature resistance and radiation resistance. The characteristic impedance of the coaxial wall-penetrating piece is designed as 50Ω, which can be matched with a conventional 50Ω high-voltage RF coaxial cable. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the present application;

[0020] wherein 1 is a welding assembly, 2 is an inner conductor; 3 is an inner conductor adapter part; 4 is an insulating part; 5 is an outer shell; 6 is a threaded ring.

[0021] Figure 2 is a structural schematic diagram of the welding assembly.

[0022] wherein 11 is a flange, 12 is a welding part inner conductor; 13 is a ceramic part. DETAILED DESCRIPTION

[0023] The present application is a high-voltage radio frequency vacuum coaxial wall-penetrating part, which comprises a welding assembly 1, an inner conductor 2, an inner conductor adapter part 3, an insulating part 4, an outer shell 5 and a threaded ring 6. The welding assembly 1 comprises a flange 11, a welding part inner conductor 12 and a ceramic part 13.

[0024] The present application will be described in further detail below in combination with the accompanying drawings and specific embodiments.

[0025] Embodiment 1, see Figure 1 A high-voltage radio frequency coaxial vacuum wall-penetrating part, the welding part inner conductor 12, the inner conductor 2 and the inner conductor adapter part 3 together constitute the inner conductor of the wall-penetrating part, the flange 11, the outer shell 5 and the threaded ring 6 together constitute the outer conductor of the wall-penetrating part, the ceramic part 13 and the insulating part 4 are assembled between the outer conductor of the wall-penetrating part and the inner conductor of the wall-penetrating part, which isolates the inner conductor of the wall-penetrating part and the outer conductor of the wall-penetrating part, and breaks the circuit between the inner and outer conductors. See Figure 2 The ceramic part 13 is designed as a flat-bottomed V-shaped structure as a whole, the bottom center of which is provided with a circular through hole matching the welding part inner conductor 12, the welding part inner conductor 12 is inserted into the hole and welded and fixed with the ceramic part 13 at the bottom, and the upper end of the through hole of the welding part inner conductor 12 and the ceramic part 13 is matched in size by a tolerance to ensure smooth installation; the ceramic part 13 and the flange 11 are welded and fixed, so that the welding part inner conductor 12, the ceramic part 13 and the flange 11 constitute the welding assembly 1, realizing vacuum sealing. See Figure 1On the basis of the welded assembly 1, the inner conductor 2, the inner conductor adapter 3, the insulating piece 4 and the outer shell 5 are assembled in turn, the outer shell 5 is fixed with the welded assembly 1 by screws, and finally the threaded ring 6 is assembled to compress the insulating piece 4. The top end of the welded inner conductor 12 is provided with a threaded hole, facilitating connection with high-voltage equipment; the lower end of the welded inner conductor 12 is provided with a threaded hole, connected with the inner conductor 2; the inner conductor adapter 3 is connected with the inner conductor 2 through threads at one end and designed into an elastic plug-in structure at the other end, facilitating connection with a cable. One end of the insulating piece 4 matches with the flat-bottom V-shaped structure of the ceramic piece 13, and the other end is designed into a groove structure, increasing the creepage distance and playing a role in high-voltage resistance. The threaded ring 6 is connected with the outer shell 5 through external threads to realize fixation of the insulating piece 4. In use, one end of the flange is connected with the corresponding flange of high-voltage equipment, and communicates with the high-voltage equipment in a vacuum environment; one end of the shell is connected with a cable connector, realizing electrical communication.

[0026] To sum up, the above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high voltage radio frequency coaxial vacuum through-wall, characterized by, The application relates to a through-wall piece, which comprises a welding assembly (1), an inner conductor (2), an inner conductor adapter (3), an insulating piece (4), an outer shell (5) and a threaded ring (6). The welding assembly (1) comprises a flange (11), a welding inner conductor (12) and a ceramic piece (13); the ceramic piece (13) is provided with a through hole matched with the welding inner conductor (12) in the center, the lower end of the welding inner conductor (12) is inserted into the through hole and is fixedly connected with the ceramic piece (13); and the ceramic piece (13) is fixedly connected with the flange (11) in a sealing mode. The flange of the welding assembly (1) is in contact with the upper end of the outer shell (5), the inner conductor (2) and the inner conductor adapter (3) are located in the center of the insulating piece (4) and the outer shell (5), the upper end of the inner conductor (2) is connected with the lower end of the welding inner conductor (12), the lower end of the inner conductor (2) is connected with the inner conductor adapter (3), and the welding inner conductor (12), the inner conductor (2) and the inner conductor adapter (3) constitute a through-wall piece inner conductor. The inner conductor (2) and the inner conductor adapter (3) are filled with the insulating piece (4) between the outer shell (5), the threaded ring (6) is connected with the lower end of the outer shell (5) and is used for pressing the insulating piece (4), and the flange (11), the outer shell (5) and the threaded ring (6) constitute a through-wall piece outer conductor. The ceramic piece (13) is a flat-bottom V-shaped structure, the bottom center of the ceramic piece (13) is provided with a through hole matched with the welding inner conductor (12), one end of the insulating piece (4) is a horn mouth structure matched with the ceramic piece (13), and the other end is a groove structure used for increasing a creepage distance.

2. The high-voltage RF coaxial vacuum wall -penetration of claim 1, wherein, The upper end of the welding inner conductor (12) is provided with a threaded hole and is used for being connected with a high-voltage equipment, and the lower end of the welding inner conductor (12) is provided with a threaded hole and is used for being connected with the inner conductor (2).

3. The high-voltage RF coaxial vacuum wall -penetration of claim 1, wherein, The upper end of the inner conductor adapter (3) is connected with the inner conductor (2) in a threaded mode, and the lower end of the inner conductor adapter (3) is an elastic plug-in structure and is used for being connected with a cable.

4. The high-voltage RF coaxial vacuum wall -penetration of any of claims 1-3, wherein, The ceramic piece (13) is 99% alumina ceramic.

5. The high-voltage RF coaxial vacuum wall -penetrating according to any of claims 1 to 3, characterized in that The material of the insulating piece (4) is polyether ether ketone (PEEK).

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