CN107094008B

CN107094008B - Gas rail switch

Info

Publication number: CN107094008B
Application number: CN201710494666.0A
Authority: CN
Inventors: 方东凡; 秦卫东; 孙奇志; 刘伟; 李军; 刘正芬; 池原; 贾月松; 赵小明
Original assignee: Institute of Fluid Physics of CAEP
Current assignee: Institute of Fluid Physics of CAEP
Priority date: 2017-06-26
Filing date: 2017-06-26
Publication date: 2023-04-18
Anticipated expiration: 2037-06-26
Also published as: CN107094008A

Abstract

The invention discloses a gas track switch, which comprises a switch base and a switch shell, wherein the switch base is positioned in a cavity of the base and is provided with a trigger electrode center seat, the switch base is provided with two main electrodes, each main electrode is provided with an electrode head end and an electrode tail end, the trigger electrode center seat is provided with a trigger electrode, a conductive column electrically connected with the trigger electrode is arranged in the trigger electrode center seat, and a trigger electrode conductive switch contact electrically connected with the conductive column is arranged on the switch base; the switch base is internally provided with an electrode embedding seat corresponding to the main electrode, the electrode embedding seat is provided with an electrode connecting end A and an electrode connecting end B electrically connected with the electrode connecting end A, the electrode connecting end B is electrically connected with the electrode tail end of the main electrode, and the switch base is fixedly connected with the switch shell through a plurality of screws. The invention adopts the integral casting molding process, simplifies the sealing structure of the switch cavity, reduces the maintenance workload of the switch, and improves the mechanical property of the switch to conduct large current.

Description

Gas rail switch

Technical Field

The invention relates to the field of nuclear science and technical research, is one of important leading edge research directions in the branches of pulse power science and technology, in particular to a gas track switch which is a core component in the construction of a device platform for generating large current required by preheating and magnetizing plasma in a reversed field configuration in the research of magnetized target fusion.

Background

The switching technology is used as an indispensable important basic support in the field of pulse power science and technical research, and the technical level of the switching technology directly determines the voltage and current working indexes and the subsequent physical experiment level of a large-scale pulse power device. For different application scenarios and operating conditions, the switch generally requires one of the characteristics of high voltage, large current, fast conduction, high repetition frequency, long service life, low jitter, and the like, or has both of the characteristics. The high-voltage switch is required to have high voltage-resisting capability, is mainly used for a pulse power device generating high-voltage output, and focuses on the design of the insulation voltage-resisting performance of the switch; the large current switch requires large current conduction capability, and is mainly used in a pulse power device for generating large current output, and the design of multi-channel conduction, low inductance, resistance to mechanical impact strength and the like of the switch is emphasized.

Multi-channel gas spark switches are often used in high current, low inductance pulse forming networks to achieve fast rise-front, high current pulse on-off. The multi-channel can obtain smaller switch inductance, is beneficial to improving the output level of the device, bears large current and can prolong the service life of the switch. The current capacity of the track switch in the prior mature technology is far less than 400kA, and the gas track switch with the current capacity of 400kA in the air environment is specially developed to meet the requirements of actual work and actual work due to the restriction of factors such as insufficient current capacity, non-gas working medium, non-air working environment, large structural size and the like.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a gas track switch which is used for generating a large-current device required to be built for preheating and magnetizing plasma (magnetized target fusion research) in a reverse field configuration; the developed gas track switch can be used in an air environment, and the through-current capacity is 400kA.

The purpose of the invention is realized by the following technical scheme:

a gas track switch comprises a switch base and a switch shell, wherein the switch base is provided with a base cavity, the switch base is provided with a trigger electrode center seat at the center of the base cavity, the switch shell is provided with a shell cavity communicated with the base cavity, and the base cavity and the shell cavity jointly form a switch cavity; the switch base is provided with two main electrodes, each main electrode is provided with an electrode head end and an electrode tail end, and the electrode head ends of the two main electrodes are symmetrically arranged relative to the trigger electrode center seat; the trigger electrode center seat is provided with a trigger electrode, the trigger electrode is positioned between the electrode head ends of the two main electrodes, a conductive column electrically connected with the trigger electrode is arranged inside the trigger electrode center seat, the switch base is provided with a switch contact mounting hole, and a trigger electrode conductive switch contact electrically connected with the conductive column is arranged in the switch contact mounting hole; an electrode embedding seat is arranged in the switch base corresponding to the main electrode, the electrode embedding seat is provided with an electrode connecting end A and an electrode connecting end B electrically connected with the electrode connecting end A, the electrode connecting end B is electrically connected with the electrode tail end of the main electrode, and the electrode connecting end A penetrates through the side wall of the switch base; the switch base is fixedly connected with the switch shell through a plurality of screws.

In order to better realize the invention, the side wall of the switch base is provided with a connecting piece, and the switch base, the trigger electrode center seat, the electrode embedding seat, the main electrode and the connecting piece are integrally cast, processed and manufactured.

Preferably, the electrode tips of the two main electrodes are both semi-cylindrical, the trigger electrode is entirely triangular prism-shaped, and the trigger vertex of the trigger electrode is located below the central connecting line of the two electrode tips.

Preferably, the side wall of the switch shell is provided with a connecting piece, and the connecting piece is provided with a plurality of threaded connecting holes B.

Preferably, the tail end of the electrode is fixedly connected with the electrode connecting end B through a plurality of screws.

Preferably, the current capacity that can be tolerated between the two main electrodes is 400kA.

Preferably, the switch base is made of a vinyl resin material; the main electrode is made of a chromium-zirconium-copper electrode, and the trigger electrode is made of a chromium-zirconium-copper material.

Compared with the prior art, the invention has the following advantages and beneficial effects:

(1) The invention adopts the integral casting molding process, simplifies the sealing structure of the switch cavity, reduces the number of system components, reduces the maintenance workload of the switch, and improves the mechanical property of the switch to conduct large current. The switch base adopts vinyl resin, and the switch base and the connecting piece are integrally cast and molded, so that the switch base body is more elastic, is less prone to breaking, has higher impact strength, and can improve the through-current capacity.

(2) The main electrode of the invention adopts the large-diameter linear track chromium zirconium copper electrode, thereby reducing the gradient change of the electric field intensity on the surface of the switch electrode during charging, effectively reducing the electric field gradient of the trigger electrode area and improving the working reliability of the switch.

(3) The invention can be directly connected with the trigger cable without additional trigger bias or coupling components, thereby reducing the inductance of the trigger loop and being beneficial to obtaining high-gradient trigger pulses by the trigger electrode. The trigger electrode is made of chromium zirconium copper and is arranged below the axis of the main electrode, so that ablation of the trigger electrode is reduced, and the service life of the switch is prolonged.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

fig. 2 is a schematic structural diagram of the switch base of the present invention.

Wherein, the names corresponding to the reference numbers in the drawings are as follows:

1-switch base, 2-switch shell, 3-trigger electrode center base, 4-base cavity, 5-electrode embedded base, 51-electrode connecting end A, 52-electrode connecting end B, 6-main electrode, 61-electrode head end, 62-electrode tail end, 7-connecting piece, 8-trigger electrode, 9-conductive column, 10-threaded connecting hole A, 11-switch contact mounting hole.

Detailed Description

The present invention will be described in further detail with reference to the following examples:

examples

As shown in fig. 1 to 2, a gas track switch includes a switch base 1 and a switch housing 2, the switch base 1 is provided with a base cavity 4, the switch base 1 is provided with a trigger electrode center seat 3 at the center of the base cavity 4, the switch base 1 is made of vinyl resin material, a main electrode 6 is made of chromium zirconium copper electrode, and a trigger electrode 8 is made of chromium zirconium copper material. The switch shell 2 is provided with a shell cavity communicated with the base cavity 4, and the base cavity 4 and the shell cavity jointly form a switch cavity. The switch base 1 is provided with a connecting piece 7 on the side wall, and the switch base 1, the trigger electrode center seat 3, the electrode embedding seat 5, the main electrode 6 and the connecting piece 7 are integrally cast, processed and manufactured. The side wall of the switch shell 2 is provided with a connecting piece 7, and the connecting piece 7 is provided with a plurality of threaded connecting holes B.

As shown in fig. 1, two main electrodes 6 are provided on the switch base 1, and the current capacity that can be borne between the two main electrodes 6 is 400kA. Each main electrode 6 has an electrode tip 61 and an electrode tail 62, and the electrode tips 61 of the two main electrodes 6 are symmetrically arranged with respect to the trigger electrode center seat 3. The electrode tips 61 of the two main electrodes 6 are both in a semi-cylinder shape, the trigger electrode 8 is in a triangular prism shape as a whole, and the trigger vertex of the trigger electrode 8 is preferably located below the central connecting line of the two electrode tips 61. The trigger electrode center base 3 is provided with a trigger electrode 8, the trigger electrode 8 is positioned between electrode head ends 61 of two main electrodes 6, a conductive column 9 electrically connected with the trigger electrode 8 is arranged inside the trigger electrode center base 3, a switch contact mounting hole 11 is formed in the switch base 1, and a trigger electrode conductive switch contact electrically connected with the conductive column 9 is arranged in the switch contact mounting hole 11.

As shown in fig. 1, an electrode inserting seat 5 is further disposed inside the switch base 1 corresponding to the main electrode 6, the electrode inserting seat 5 has an electrode connecting end a51 and an electrode connecting end B52 electrically connected to the electrode connecting end a51, the electrode connecting end B52 is electrically connected to the electrode tail end 62 of the main electrode 6, and the electrode connecting end a51 penetrates through the side wall of the switch base 1. The switch base 1 and the switch shell 2 are fixedly connected through a plurality of screws, a plurality of threaded connecting holes A are formed in the switch base 1, threaded connecting holes C corresponding to the threaded connecting holes A are formed in the switch shell 2, and the screws sequentially penetrate through the threaded connecting holes C of the switch shell 2 and the threaded connecting holes A of the switch base 1 to fixedly connect the switch shell 2 and the switch base 1. The electrode tail end 62 is fixedly connected to the electrode connection end B52 by a plurality of screws.

The working principle of the invention is as follows:

when the trigger cable is used, the trigger electrode conductive switch contact is installed in the switch contact installation hole 11, an external trigger power supply is connected through the trigger electrode conductive switch contact, and external trigger cable connection operation is performed through the trigger electrode conductive switch contact. The electrode connecting ends a51 of the two electrode inserting seats 5 are respectively connected with an external switch fitting or an external power supply, the electrode inserting seats 5 and the main electrodes 6 are arranged in one-to-one correspondence, and the current capacity born between the electrode ends 61 of the two main electrodes 6 is 400kA. When the trigger electrode conductive switch contact enables an external trigger power supply to be electrically connected with the conductive column 9, the conductive column 9 is electrically connected with the trigger electrode 8, the trigger electrode 8 triggers the electric energy to flow between the electrode tips 61 of the two main electrodes 6 through strong electric field distortion, the function of a gas track switch is realized, and the electric energy of 400kA can flow.

The invention relates to a 400kA gas track switch developed for generating a large current device constructed by magnetizing plasma in an inverted field configuration. And an integral pouring processing mode is adopted, so that the sealing mode of the switch cavity can be simplified, and the reduction of the number of system components is facilitated to reduce the maintenance workload of the switch. The main electrode 6 adopts a large-diameter linear track chromium zirconium copper electrode, which is beneficial to reducing the gradient change of the electric field intensity on the surface of the electrode before the switch is not switched on, and simultaneously effectively reduces the electric field gradient in the trigger electrode area and improves the working reliability of the switch. The trigger electrode 8 is made of chromium-zirconium-copper material and is arranged below the central connecting line of the two main electrodes 6, so that ablation of the trigger electrode 8 can be reduced, and the service life of the switch can be prolonged. The switch trigger track is designed in the middle of the gap of the main electrode 6, no additional trigger bias or coupling component is needed, the direct connection of a trigger cable is facilitated, the inductance of a trigger loop can be reduced, and the trigger electrode can obtain high-gradient trigger pulses.

The invention has the following advantages:

firstly, in order to simplify the sealing structure of the switch cavity, reduce the number of system components, reduce the workload of switch maintenance and improve the mechanical property of the switch so as to conduct large current, the base body of the track switch adopts an integral casting processing and forming method.

Secondly, finally determining a method for integrally pouring the vinyl resin and the large-size metal insert (metal insert is a connecting piece) on the switch base body through multi-wheel structural design change and through-flow debugging.

And the third main electrode 6 adopts a large-diameter linear track chromium zirconium copper electrode so as to reduce the gradient change of the electric field intensity on the surface of the switch electrode during charging, effectively reduce the electric field gradient in the trigger electrode area and improve the working reliability of the switch.

And fourthly, the fixed connection between the main electrode 6 and the switch base 4 adopts a slotted hole structure design, so that the parallelism and the gap distance between the main electrodes can be conveniently adjusted, and the adjustment of the working range of the switch is facilitated.

And fifthly, the switch trigger track is designed in the middle of the gap of the main electrode 6, and can be directly connected with a trigger cable without additional trigger bias or coupling elements, so that the inductance of a trigger loop is reduced, and the trigger electrode 8 can obtain high-gradient trigger pulses. The trigger electrode 8 is made of chromium zirconium copper and is arranged below the axis of the main electrode, so that ablation of the trigger electrode is reduced, and the service life of the switch is prolonged.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A gas track switch, comprising a switch base (1) and a switch housing (2), characterized in that: the switch base (1) is provided with a base cavity (4), the switch base (1) is provided with a trigger electrode center seat (3) at the center of the base cavity (4), and the switch shell (2) is provided with a shell cavity communicated with the base cavity (4); the switch base (1) is provided with two main electrodes (6), each main electrode (6) is provided with an electrode head end (61) and an electrode tail end (62), and the electrode head ends (61) of the two main electrodes (6) are symmetrically arranged relative to the trigger electrode center seat (3); the trigger electrode center seat (3) is provided with a trigger electrode (8), the trigger electrode (8) is positioned between electrode head ends (61) of two main electrodes (6), a conductive column (9) electrically connected with the trigger electrode (8) is arranged in the trigger electrode center seat (3), the switch base (1) is provided with a switch contact mounting hole (11), and a trigger electrode conductive switch contact electrically connected with the conductive column (9) is mounted in the switch contact mounting hole (11); an electrode embedding seat (5) is further arranged in the switch base (1) corresponding to the main electrode (6), the electrode embedding seat (5) is provided with an electrode connecting end A (51) and an electrode connecting end B (52) electrically connected with the electrode connecting end A (51), the electrode connecting end B (52) is electrically connected with an electrode tail end (62) of the main electrode (6), and the electrode connecting end A (51) penetrates through the side wall of the switch base (1); the switch base (1) and the switch shell (2) are fixedly connected through a plurality of screws;

the switch base is characterized in that a connecting piece (7) is arranged on the side wall of the switch base (1), and the switch base (1), the trigger electrode center seat (3), the electrode embedding seat (5), the main electrode (6) and the connecting piece (7) are integrally cast, processed and manufactured;

the electrode head ends (61) of the two main electrodes (6) are both in a semi-cylinder shape, the trigger electrode (8) is integrally in a triangular prism shape, and the trigger vertex of the trigger electrode (8) is positioned below the central connecting line of the two electrode head ends (61).

2. The gas track switch of claim 1, wherein: be equipped with connecting piece (7) on switch casing (2) lateral wall, it has a plurality of threaded connection hole B to open on connecting piece (7).

3. The gas track switch of claim 1, wherein: the electrode tail end (62) is fixedly connected with the electrode connecting end B (52) through a plurality of screws.

4. The gas track switch of claim 1, wherein: the current capacity that can be borne between the two main electrodes (6) is 400kA.

5. The gas track switch of claim 1, wherein: the switch base (1) is made of vinyl resin material; the main electrode (6) is made of a chromium-zirconium-copper electrode, and the trigger electrode (8) is made of a chromium-zirconium-copper material.