Magnetic core auxiliary type coaxial preionization three-electrode gas switch

Abstract

The invention relates to the technical field of pulse power, in particular to a magnetic core auxiliary type coaxial preionization three-electrode gas switch which comprises a gas switch body, and the gas switch body comprises a low-voltage electrode, a high-voltage electrode and a trigger electrode which are coaxially arranged in an insulating supporting piece; the trigger electrode and the low-voltage electrode form a preionization gap, and the trigger electrode and the high-voltage electrode form a main gap; the trigger electrode is used for receiving trigger pulse voltage, when the trigger pulse enables the bottom of the trigger electrode to generate strong field distortion, the preionization gap is rapidly broken down and the main gap is subjected to ultraviolet preionization, and when the trigger pulse reaches the low-voltage electrode, the main gap of the gas switch is induced to be rapidly broken down. The switch can improve the stability of main gap breakdown.

Description

Technical Field

[0001] The invention relates to the technical field of pulse power, and in particular to a magnetic core-assisted coaxial pre-ionization three-electrode gas switch. Background Art

[0002] Gas spark switches are the core equipment in pulse power devices. As pulse power devices develop towards higher power and higher voltage levels, gas spark switches are required to have characteristics such as controllable and adjustable, wide operating voltage range, low inductance and jitter, and long life.

[0003] Preionization triggering is an effective method to reduce the switch triggering delay and jitter. Its influencing mechanism is: the plasma formed by preionization can directly provide initial electrons for the development of gap breakdown. The ultraviolet light generated by preionization discharge can cause spatial photoionization and the photoelectric effect of the cathode, which are all conducive to the triggering breakdown of the gas gap and improve the triggering performance of the switch. There are many ways to generate preionization, and the spark discharge has a high ionization intensity and produces a large number of high-energy ultraviolet photons. It has a significant effect on reducing switch jitter and is widely used in high-power closed switches. Typical preionization switches mostly use needle-type, with a single trigger discharge channel. The surface area of ​​the needle-type electrode is small, and the current density is easy to concentrate. This design leads to a large current density on the electrode during the preionization process, which is easy to cause electrode ablation. Electrode ablation will affect the performance and life of the switch, and may increase the triggering delay and jitter of the switch, and may even cause the switch to fail. In addition, the single trigger discharge channel makes the energy distribution in the discharge process uneven, which is easy to cause local overheating and electric field distortion, increasing instability. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a magnetic core assisted coaxial pre-ionization three-electrode gas switch in view of the above-mentioned deficiencies in the prior art, with the aim of solving the problem of high instability when the gas switch is triggered to breakdown.

[0005] The objective of the present invention is achieved by the following technical solutions: A core-assisted coaxial pre-ionization three-electrode gas switch comprises a gas switch body, wherein the gas switch body comprises a low-voltage electrode, a high-voltage electrode and a trigger electrode coaxially arranged inside an insulating support; the trigger electrode and the low-voltage electrode constitute a pre-ionization gap, and the trigger electrode and the high-voltage electrode constitute a main gap; the trigger electrode is used to receive a trigger pulse voltage, when the trigger pulse causes a strong field distortion at the bottom of the trigger electrode, the pre-ionization gap quickly breaks down, and ultraviolet pre-ionization is performed on the main gap, and when the trigger pulse reaches the low-voltage electrode, it induces the main gap of the gas switch to quickly break down. As a further improvement of the present invention, the insulating support member includes a first insulating support member and a second insulating support member; the high-voltage electrode is connected to the second insulating support member through a high-voltage electrode seat, and the low-voltage electrode is connected to the first insulating support member through a low-voltage electrode seat.

[0006] As a further improvement of the present invention, a supporting groove is provided on the inner side wall of the first insulating support member, a limiting block supported by the supporting groove is provided on the top of the trigger electrode, the limiting block is tightly connected to the groove wall of the supporting groove, and a trigger electrode seat is also sleeved on the top of the limiting block; the trigger electrode is coaxially suspended between the low-voltage electrode and the high-voltage electrode through the first insulating support member and the trigger electrode seat to form a switch sealing cavity.

[0007] As a further improvement of the present invention, the second insulating support member is connected to the high voltage electrode seat via a conductive connecting member, and the first insulating support member is connected to the low voltage electrode seat via a conductive connecting member.

[0008] As a further improvement of the present invention, the high voltage electrode is also used for externally connecting to a positive polarity high voltage DC power supply, the low voltage electrode is used for grounding, and the trigger electrode is used for externally connecting to a nanosecond negative polarity pulse.

[0009] As a further improvement of the present invention, the low-voltage electrode is grounded through a low-remanence nanocrystalline magnetic core, and the trigger pulse reaches the low-voltage electrode, inducing the breakdown of the switch main gap and the saturation of the magnetic core.

[0010] As a further improvement of the present invention, the high-voltage electrode seat and the low-voltage electrode seat are respectively provided with air holes for adjusting the air pressure in the switch cavity, which are used for ventilation when the switch is working.

[0011] As a further improvement of the present invention, the interiors of the first insulating support member and the second insulating support member are designed to be annular groove structures.

[0012] As a further improvement of the present invention, the bottom of the low-voltage electrode is a circular arc ring structure, and the top of the high-voltage electrode is an elliptical arc structure.

[0013] As a further improvement of the present invention, the bottom of the trigger electrode is a thin disc-shaped structure, the arc radius of the thin disc-shaped structure is 10-13 mm, the thickness is 0.5-2 mm, and the adjustment range of the trigger gap distance is 1-2 mm.

[0014] The beneficial effects of the present invention are as follows: a core-assisted coaxial pre-ionization three-electrode gas switch of the present invention adopts spark pre-ionization to assist the gas switch discharge. Under the triggering working condition, the gas gap between the trigger electrode and the low-voltage electrode of the gas spark switch quickly breaks down, and the trigger pulse reaches the low-voltage electrode and induces the main gap to break down at the same time. The stability of the discharge is improved. After the trigger electrode receives the trigger pulse voltage, it can quickly generate strong field distortion in the pre-ionization gap, accelerate the breakdown process, and thus achieve rapid response. The breakdown of the pre-ionization gap helps to perform ultraviolet pre-ionization on the main gap, which can reduce the breakdown voltage of the main gap and improve the breakdown efficiency. Ultraviolet pre-ionization helps to more accurately control the start and development of the arc, thereby reducing interference with the circuit in some applications. The trigger electrode is externally connected to a negative polarity nanosecond trigger pulse, and under the triggering working condition, the pre-ionization gap is quickly broken down under strong field distortion, generating ultraviolet pre-ionization, and improving the stability of the main gap breakdown.

[0015] Furthermore, the bottom of the low-voltage electrode is set to a circular arc ring structure, and the trigger electrode and the high-voltage electrode are set to an elliptical arc structure, which improves the uniformity of the electric field during static operation and reduces discharge jitter.

[0016] Furthermore, the interior of the insulating cylinder is designed as an annular groove structure to increase the creepage distance between the high and low voltage electrodes and enhance the insulation capacity of the switch.

[0017] Furthermore, the low-voltage electrode is grounded through a low-remanence nanocrystalline core. After the trigger gap breaks down, the trigger pulse reaches the low-voltage electrode, and simultaneously induces the switch main gap breakdown and the core saturation.

[0018] Furthermore, the core gradually saturates under the action of the trigger pulse. By adjusting the core parameters to make the core fully saturated slightly later than the switch breakdown time, it helps to reduce the dispersion of the overall breakdown of the core-assisted spark pre-discharge switch.

[0019] Furthermore, a disc-shaped trigger structure is used at the bottom of the trigger electrode to guide pre-ionization, reduce electrode ablation, and extend the life of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a cross-sectional view of the coaxial magnetic core assisted coaxial pre-ionization three-electrode gas switch structure of the present invention; Figure 2This is a schematic diagram of the connection of the magnetic core-assisted coaxial pre-ionization three-electrode gas circuit of the present invention; Figure 3 It is a cross-sectional view of the electrode structure of the magnetic core assisted coaxial magnetic core assisted coaxial pre-ionization three-electrode gas switch of the present invention; Figure 4 It is a schematic diagram of the trigger electrode structure of the magnetic core assisted coaxial magnetic core assisted coaxial pre-ionization three-electrode gas switch of the present invention; Figure 5-1 The peak value and dispersion of the trigger breakdown voltage before adding the pre-ionization structure to the magnetic core-assisted coaxial magnetic core-assisted coaxial pre-ionization three-electrode gas switch of the present invention; Figure 5-2 The peak value and dispersion of the triggered breakdown voltage after adding the pre-ionization structure to the magnetic core-assisted coaxial magnetic core-assisted coaxial pre-ionization three-electrode gas switch of the present invention; Figure 6 The trigger breakdown delay time and dispersion of the magnetic core assisted coaxial magnetic core assisted coaxial pre-ionization three-electrode gas switch of the present invention; In the figure: 1. low voltage electrode; 2. high voltage electrode; 3. trigger electrode; 4. low voltage electrode seat; 5. high voltage electrode seat; 6. trigger electrode seat; 7. first insulating support member; 8. second insulating support member; 9. low remanence nanocrystalline core. DETAILED DESCRIPTION

[0022] In order to make the purpose and technical solution of the present invention clearer and easier to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] The concept of the present invention is to provide a core-assisted coaxial pre-ionization three-electrode gas switch, including a gas switch body, wherein the gas switch body includes a low-voltage electrode 1, a high-voltage electrode 2 and a trigger electrode 3 coaxially arranged inside an insulating support. The trigger electrode 3 and the low-voltage electrode 1 form a pre-ionization gap, and the trigger electrode 3 and the high-voltage electrode 2 form a main gap; the trigger electrode 3 is used to receive a trigger pulse voltage, and when the trigger pulse causes a strong field distortion at the bottom of the trigger electrode 3, the pre-ionization gap breaks down rapidly, and ultraviolet pre-ionization is performed on the main gap. When the trigger pulse reaches the low-voltage electrode, the main gap of the gas switch is induced to break down rapidly. By setting the trigger electrode 3, the trigger pulse voltage can be accurately received, and precise control of the switch can be achieved. When the trigger pulse acts, a strong field distortion is generated at the bottom of the trigger electrode 3, which quickly triggers the pre-ionization gap to break down, providing good conditions for the subsequent breakdown of the main gap. The rapid breakdown of the pre-ionization gap generates ultraviolet radiation, and ultraviolet pre-ionization is performed on the main gap. This process can reduce the breakdown voltage of the main gap, making it easier for the main gap to break down rapidly under the induction of the trigger pulse. The pre-ionization function significantly improves the breakdown speed and stability of the switch. By triggering the strong field distortion at the bottom of the electrode to quickly break down the pre-ionization gap, the main gap is UV pre-ionized, which greatly reduces the breakdown voltage of the main gap, allowing the switch to respond to the trigger pulse in a shorter time and achieve rapid conduction. The core-assisted coaxial pre-ionization three-electrode gas switch has a more consistent conduction time, reduces time jitter, and improves the reliability and repeatability of the switch. This is of great significance for application scenarios that require precise time control, such as pulse power technology, high-power microwaves, and other fields.

[0024] Among them, the insulating support includes a first insulating support 7 and a second insulating support 8; the high-voltage electrode 2 is connected to the second insulating support 8 through the high-voltage electrode seat 5, and the low-voltage electrode 1 is connected to the first insulating support 7 through the low-voltage electrode seat 4. The inner wall of the first insulating support 7 is provided with a supporting groove, and a limit block supported by the supporting groove is provided on the top of the trigger electrode. The limit block is tightly connected to the groove wall of the support groove, and the top of the limit block is also sleeved with a trigger electrode seat 6. The trigger electrode 3 is coaxially suspended between the low-voltage electrode 1 and the high-voltage electrode 2 through the first insulating support 7 and the trigger electrode seat 6 to form a switch sealing cavity.

[0025] The electrodes are coaxially arranged using insulating supports to form a sealed cavity, which effectively prevents arc discharge and gas leakage between the electrodes and improves the safety of the switch.

[0026] The second insulating support 8 is connected to the high voltage electrode holder 5 via a conductive connector, and the first insulating support 7 is connected to the low voltage electrode holder 4 via a conductive connector. At the same time, the conductive connector connection ensures a firm connection between the electrode holder and the insulating support, reducing safety hazards caused by looseness.

[0027] The high-voltage electrode 2 is also used for an external positive-polarity high-voltage DC power supply, the low-voltage electrode 1 is used for grounding, and the trigger electrode 3 is used for external connection of a nanosecond negative-polarity pulse. Specifically, the low-voltage electrode 1 is grounded through the low-residual magnetism nanocrystalline core 9, and the trigger pulse reaches the low-voltage electrode 1, inducing the main gap breakdown of the switch and the saturation of the core. The low-voltage electrode 1 is grounded through the low-residual magnetism nanocrystalline core 9, and when the trigger pulse reaches the low-voltage electrode, it induces the main gap breakdown of the switch and the saturation of the core. This grounding method can not only effectively suppress electromagnetic interference, but also improve the anti-interference ability of the switch and enhance the stability and safety of the system.

[0028] The interior of the insulating support is designed as an annular groove structure.

[0029] The bottom of the low-voltage electrode 1 is an arc-shaped ring structure, and the top of the high-voltage electrode 2 is an elliptical arc structure. The bottom of the trigger electrode 3 is set to a thin disc-shaped structure, the arc radius L1 is 10~13mm, the thickness L2 is 0.5~2mm, and the adjustment range of the trigger gap distance is 1~2mm.

[0030] The high-voltage electrode seat 5 and the low-voltage electrode seat 4 are respectively provided with air holes for adjusting the air pressure in the switch cavity, so as to perform ventilation when the switch is working.

[0031] The trigger electrode 3 is suspended between the low-voltage electrode 1 and the high-voltage electrode 2, and is connected to the trigger electrode holder 6 via a trigger electrode insulating support (i.e., the first insulating support 7). This design makes the position of the trigger electrode more flexible and can be adjusted according to actual needs, thereby optimizing the performance of the switch.

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, wherein the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0033] Example 1 like Figure 1-Figure 4 As shown, this embodiment provides a core-assisted coaxial pre-ionization three-electrode gas switch, and the following is a specific implementation method.

[0034] A core-assisted coaxial pre-ionization three-electrode gas switch in this embodiment includes a gas switch body, wherein the gas switch body is arranged in an insulating support, wherein the gas switch body includes two coaxially arranged main electrodes and a trigger electrode 3, and the main electrodes include a low-voltage electrode 1 and a high-voltage electrode 2.

[0035] The high voltage electrode 2 is connected to the second insulating support 8 via the high voltage electrode holder 5 , and the low voltage electrode 1 is connected to the first insulating support 7 (the first insulating support is the trigger electrode insulating support) via the low voltage electrode holder 4 .

[0036] The inner wall of the first insulating support 7 is provided with a support groove, and a limit block supported in the support groove is provided on the top of the trigger electrode. The limit block is supported in the support groove and is tightly connected to the groove wall of the support groove. The top of the limit block is also sleeved with a trigger electrode seat 6. The trigger electrode 3 is coaxially suspended between the low-voltage electrode 1 and the high-voltage electrode 2 through the trigger electrode insulating support and the trigger electrode seat 6. A switch sealed cavity is formed between the first insulating support 7, the second insulating support 8, the low-voltage electrode 1 and the high-voltage electrode 2. The trigger electrode 3 and the low-voltage electrode 1 inside the cavity form a pre-ionization gap, and the trigger electrode 3 and the high-voltage electrode 2 form a main gap.

[0037] The trigger pulse causes strong field distortion at the bottom of the trigger electrode, causing the pre-ionization gap to break down rapidly, generating ultraviolet to far-ultraviolet light radiation. When the trigger pulse reaches the low-voltage electrode, it simultaneously induces rapid breakdown of the switch main gap and saturation of the magnetic core.

[0038] Among them, the second insulating support is connected to the high-voltage electrode seat through a conductive connector, and the first insulating support is connected to the low-voltage electrode seat through a conductive connector. In this embodiment, the first insulating support is connected to the high-voltage electrode seat 5 through a metal bolt, and the second insulating support is connected to the low-voltage electrode seat 4 through a metal bolt. The electrodes are insulated by gas to form two gas discharge gaps of the three-electrode switch. The high-voltage electrode seat 5 and the low-voltage electrode seat 4 are respectively provided with air holes for adjusting the gas pressure in the switch cavity, and can be ventilated when the switch is working.

[0039] The first insulating support 7 and the second insulating support 8 form an insulating tube, the interior of the insulating tube is designed as an annular groove structure, and the first insulating support 7 and the second insulating support 8 are fixedly connected to the low-voltage electrode seat 4 and the high-voltage electrode seat 5 respectively.

[0040] The bottom of the low-voltage electrode 1 is configured as a circular arc ring structure, and the bottom of the trigger electrode 3 and the top of the high-voltage electrode 2 are configured as an elliptical arc structure.

[0041] like Figure 1 As shown, the present invention is a core-assisted coaxial pre-ionization three-electrode gas switch, wherein the low-voltage electrode 1 and the high-voltage electrode 2 are respectively fixed on the upper and lower sides of the second insulating support 8 through the main electrode seats 4, 5 and metal bolts, and the trigger electrode 3 is coaxially arranged at the center of the low-voltage electrode 1 through the trigger electrode seat 6 and the first insulating support 7; the low-voltage electrode 1 and the trigger electrode 3 and the high-voltage electrode 2 respectively constitute the pre-ionization gap and the main gap; the bottom of the low-voltage electrode is arranged as a circular arc ring structure, and the trigger electrode and the high-voltage electrode are arranged as an elliptical arc structure; the high-voltage electrode seat 5 and the low-voltage electrode seat 4 are respectively provided with air holes for adjusting the air pressure in the switch cavity, and at the same time, the gas in the cavity can be ventilated when the switch is working.

[0042] This embodiment uses nanosecond trigger pulse energy to generate ultraviolet to far ultraviolet light radiation through a pre-ionization gap. The trigger electrode is a disc-shaped structure. Under the trigger working condition of the spark switch, a strong field distortion is generated at the bottom of the trigger electrode, and the gas gap between the trigger electrode and the low-voltage electrode is quickly broken down to generate rich plasma, while generating ultraviolet to far ultraviolet light radiation; then, the trigger pulse reaches the low-voltage electrode, and simultaneously induces the main gap breakdown and the magnetic core saturation, which helps to reduce the dispersion of the switch breakdown and broaden the working voltage range.

[0043] like Figure 2 As shown, this embodiment also includes a low remanence nanocrystalline magnetic core 9. The high voltage electrode 2 is externally connected to a positive polarity high voltage DC power supply, the low voltage electrode 1 is grounded through the low remanence nanocrystalline magnetic core 9, and the trigger electrode 3 is externally connected to a nanosecond negative polarity pulse. Under the trigger working condition, the pre-ionization gap quickly breaks down to make the trigger electrode 3 and the low voltage electrode 1 equipotential, and at the same time induce the main gap breakdown and the core saturation. By adjusting the core parameters so that the core is completely saturated slightly later than the switch breakdown time, the switch main gap is broken down under the action of the trigger pulse, thereby widening the switch working voltage range. The magnetic ring size of the low remanence nanocrystalline magnetic core of this embodiment is 30 / 64×20 (mm), and has significant saturation characteristics. The low remanence nanocrystalline magnetic core has the characteristics of low remanence, which means that after the switch works, the magnetic core will not have too much magnetic field remaining, reducing the impact on subsequent operations. It helps to improve the repeatability of the switch, so that the switch can maintain a stable working state under multiple triggering. The introduction of the low remanence nanocrystalline magnetic core in this embodiment improves the stability of the switch. It can maintain reliable breakdown performance under different working conditions, reducing switch failures caused by voltage changes, external interference, etc. Stable performance helps improve the reliability of the entire system and reduce maintenance.

[0044] like Figure 3 , Figure 4 As shown, the bottom of the trigger electrode 3 is a disc-shaped structure, the radius L1 of the disc is 10~13mm, and the thickness L2 is 0.5~2mm; when the trigger pulse reaches the bottom of the trigger electrode, an electric field distortion is generated on the trigger disc, inducing a rapid breakdown of the pre-ionization gap, generating ultraviolet to far-ultraviolet light radiation, irradiating the main gap, and the main gap has abundant initial electrons, which reduces the difficulty of the main gap breakdown and improves the main gap breakdown stability; the disc-shaped trigger structure is conducive to improving the dispersion of the pre-ionization point, which is conducive to reducing electrode ablation and extending the life of the electrode. The bottom of the trigger electrode adopts a disc-shaped design, the radius of the disc is 10~13mm, the thickness is 0.5~2mm, and the outer ring of the disc is an arc-shaped chamfer. For example, the arc radius of the thin disc-shaped structure at the bottom of the trigger electrode in this embodiment is 13mm and the thickness is 0.5mm.

[0045] In this embodiment, the materials of the low voltage electrode 1, the high voltage electrode 2, the trigger electrode 3, the low voltage electrode holder 4, the low voltage electrode holder 5 and the trigger electrode holder 6 include tungsten nickel copper alloy and stainless steel. The material of the first insulating support member 7 and the second insulating support member 8 includes polyetheretherketone (PEEK). Other embodiments may be adopted as other embodiments.

[0046] The principle of this embodiment is: during operation, the high-voltage electrode is connected to a positive polarity DC high voltage, the low-voltage electrode is grounded through a magnetic core winding, and the trigger electrode receives a second-level negative polarity pulse voltage. When the trigger pulse value is higher than the pre-ionization gap breakdown voltage, the pre-ionization gap quickly breaks down and discharges, and the main gap of the switch is pre-ionized by ultraviolet light in advance. At the same time, the low-voltage electrode 1 is quickly pulled down to a negative pulse potential, and the main gap overvoltage multiple gradually increases to form a conduction of the gas switch. At the same time, the magnetic core is quickly saturated under the action of the trigger pulse.

[0047] The main gap breaks down under the action of the trigger pulse, which helps to further reduce the working coefficient of the switch; at the same time, the magnetic core gradually saturates under the action of the trigger pulse. By adjusting the core parameters to make the core fully saturated slightly later than the switch breakdown time, it helps to reduce the dispersion of the overall breakdown of the core-assisted spark pre-discharge switch.

[0048] Two gas switches were trial-produced using the structural design of this embodiment.

[0049] The high-voltage electrode is charged with a positive polarity DC voltage corresponding to a working coefficient of 10%~70%, and the low-voltage electrode is grounded through a low remanent nanocrystalline core with 2 turns. The trigger electrode is connected to a nanosecond trigger pulse of -2.5kV / ns through a 1nF isolation capacitor and a 300Ω isolation resistor, and the discharge load is a 3μH inductor. The radius of the disk is 13mm, the thickness is 0.5mm, the pre-ionization gap is adjusted to 1mm, and the main gap is 3mm. Through the switch breakdown characteristic experiment, the breakdown characteristic curves of the two switches before and after the addition of the pre-ionization trigger electrode were measured. Figure 5-1 , Figure 5-2 It can be seen that after adding the pre-ionization structure, between 10% and 70% of the duty cycle, the peak value of the single switch breakdown trigger voltage is less than 30kV, and the jitter is less than 0.5kV. Figure 6 It can be seen that the switch can still break down at a 10% duty cycle, with an overall delay of less than 1.3μs and a jitter of less than 63ns. At a 70% duty cycle, the overall delay is less than 252ns and the jitter is less than 6ns, which well meets the application requirements of stable and reliable switches and a wide operating voltage range.

[0050] In summary, the magnetic core-assisted coaxial pre-ionization three-electrode gas in this embodiment adopts spark pre-ionization to assist the gas switch discharge, thereby improving the stability of the discharge, and adopts a disc-shaped trigger structure to guide the pre-ionization, thereby reducing the ablation of the electrode and extending the life of the switch; in addition, the introduction of the magnetic core causes the main gap to break down under the action of the trigger pulse, which helps to widen the operating voltage range of the switch and reduce the overall dispersion.

[0051] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A core-assisted coaxial preionization three-electrode gas switch, characterized in that: It comprises a gas switch body, which comprises a low-voltage electrode, a high-voltage electrode and a trigger electrode coaxially arranged inside an insulating support; the trigger electrode and the low-voltage electrode form a pre-ionization gap, and the trigger electrode and the high-voltage electrode form a main gap; the trigger electrode is used to receive a trigger pulse voltage, when the trigger pulse causes a strong field distortion at the bottom of the trigger electrode, the pre-ionization gap quickly breaks down, and ultraviolet pre-ionization is performed on the main gap, and when the trigger pulse reaches the low-voltage electrode, it induces the main gap of the gas switch to quickly break down.

2. The core-assisted coaxial preionization three-electrode gas switch according to claim 1, characterized in that: The insulating support member includes a first insulating support member and a second insulating support member; the high-voltage electrode is connected to the second insulating support member via a high-voltage electrode seat, and the low-voltage electrode is connected to the first insulating support member via a low-voltage electrode seat.

3. The core-assisted coaxial preionization three-electrode gas switch according to claim 2, characterized in that: A supporting groove is provided on the inner side wall of the first insulating support member, and a limiting block supported by the supporting groove is provided on the top of the trigger electrode. The limiting block is tightly connected to the groove wall of the supporting groove, and a trigger electrode seat is also sleeved on the top of the limiting block; the trigger electrode is coaxially suspended between the low-voltage electrode and the high-voltage electrode through the first insulating support member and the trigger electrode seat to form a switch sealing cavity.

4. The core-assisted coaxial preionization three-electrode gas switch according to claim 2, characterized in that: The second insulating support member is connected to the high-voltage electrode seat via a conductive connector, and the first insulating support member is connected to the low-voltage electrode seat via a conductive connector.

5. The core-assisted coaxial preionization three-electrode gas switch according to claim 2, characterized in that: The high voltage electrode is also used for externally connecting to a positive polarity high voltage direct current power supply, the low voltage electrode is used for grounding, and the trigger electrode is used for externally connecting to a nanosecond negative polarity pulse.

6. The core-assisted coaxial preionization three-electrode gas switch according to claim 5, characterized in that: The low-voltage electrode is grounded through a low-remanence nanocrystalline magnetic core, and a trigger pulse reaches the low-voltage electrode, inducing a breakdown of the switch main gap and saturation of the magnetic core.

7. The core-assisted coaxial preionization three-electrode gas switch according to claim 2, characterized in that: The high-voltage electrode seat and the low-voltage electrode seat are respectively provided with air holes for adjusting the air pressure in the switch cavity, which are used for ventilation when the switch is working.

8. The core-assisted coaxial preionization three-electrode gas switch according to claim 2, characterized in that: The first insulating support member and the second insulating support member are designed to have an annular groove structure inside.

9. The core-assisted coaxial preionization three-electrode gas switch according to claim 1, characterized in that: The bottom of the low-voltage electrode is an arc-shaped ring structure, and the top of the high-voltage electrode is an elliptical arc structure.

10. The core-assisted coaxial preionization three-electrode gas switch according to claim 1, characterized in that: The bottom of the trigger electrode is a thin disc-shaped structure, the arc radius of the thin disc-shaped structure is 10-13 mm, the thickness is 0.5-2 mm, and the adjustment range of the trigger gap distance is 1-2 mm.

Images