阅读说明：本技术 一种气体火花开关、金属丝电爆炸回路及其控制方法 (Gas spark switch, metal wire electric explosion loop and control method thereof ) 是由 刘思民 张永民 闫敬旺 迟宝锁 卢勇 王建文 陈菲 闫世平 于 2021-08-17 设计创作，主要内容包括：本申请公开了一种气体火花开关、金属丝电爆炸回路及其控制方法,气体火花开关包括上座体、下座体和外壳；上座体、下座体和外壳形成内部具有空腔的密封结构,外壳的侧壁设有气嘴；上座体和下座体均包括电极座和石墨电极,石墨电极伸入外壳的内部,电极座安装于外壳的端部；两个石墨电极相对且间隔设置。金属丝电爆炸回路包括上述的气体火花开关、以及充电电源、储能电容、泄放单元、金属丝负载和压缩空气泵；金属丝电爆炸回路的控制方法包括步骤：气密性检查；储能电容的充电；金属丝负载的工作；储能电容的放电；本申请解决了传统的气体火花开关通过电荷量过大时,气体火花开关的电极和绝缘材料存在严重烧蚀的问题。(The application discloses a gas spark switch, a metal wire electric explosion loop and a control method thereof, wherein the gas spark switch comprises an upper seat body, a lower seat body and a shell; the upper seat body, the lower seat body and the shell form a sealing structure with a cavity inside, and the side wall of the shell is provided with an air tap; the upper seat body and the lower seat body respectively comprise an electrode seat and a graphite electrode, the graphite electrode extends into the shell, and the electrode seats are arranged at the end part of the shell; the two graphite electrodes are arranged oppositely and at intervals. The metal wire electric explosion loop comprises the gas spark switch, a charging power supply, an energy storage capacitor, a discharge unit, a metal wire load and a compressed air pump; the control method of the wire electric explosion loop comprises the following steps: checking air tightness; charging an energy storage capacitor; wire-loaded operation; discharging the energy storage capacitor; the problem that when the passing charge amount of a traditional gas spark switch is too large, the electrode and the insulating material of the gas spark switch are seriously ablated is solved.)

1. A gas spark switch, characterized by: comprises an upper seat body (1), a lower seat body (2) and a shell (3) with a cylindrical structure;

the structure of the upper seat body (1) is the same as that of the lower seat body (2), the upper seat body (1) and the lower seat body (2) are symmetrically arranged at the upper end and the lower end of the shell (3), the upper seat body (1), the lower seat body (2) and the shell (3) form a sealing structure with a cavity inside, and the side wall of the shell (3) is provided with an air nozzle (4) for inflating and deflating the cavity inside the shell (3);

the upper seat body (1) and the lower seat body (2) respectively comprise an electrode seat (5) and a graphite electrode (6) connected to one end of the electrode seat (5), the graphite electrode (6) extends into the shell (3), and the electrode seat (5) is installed at the end part of the shell (3);

the graphite electrode (6) of the upper seat body (1) and the graphite electrode (6) of the lower seat body (2) are arranged oppositely and at intervals.

2. A gas spark switch as claimed in claim 1, wherein: the graphite electrodes (6) of the upper base body (1) and the graphite electrodes (6) of the lower base body (2) are arranged at intervals of 9-11 mm.

3. A gas spark switch as claimed in claim 2 wherein: a gasket (7) is further arranged between the graphite electrode (6) and the electrode seat (5), and the gasket (7) is used for adjusting the distance between the graphite electrode (6) of the upper seat body (1) and the graphite electrode (6) of the lower seat body (2).

4. A gas spark switch as claimed in claim 3, wherein: the graphite electrode (6) and the electrode holder (5) are connected through threads, a threaded hole is formed in the end portion of the graphite electrode (6), and a stud matched with the threaded hole is arranged at the end portion of the electrode holder (5).

5. A gas spark switch as claimed in claim 1, wherein: the electrode holder is characterized by further comprising a protective shell (8) used for fixing the upper holder body (1) and the lower holder body (2), and bolts sequentially penetrate through the protective shell (8) and holes in the electrode holder (5) and then are screwed into threaded holes in the shell (3).

6. A gas spark switch as claimed in claim 1, wherein: the outer side wall of the shell (3) is provided with a plurality of spherical protrusions (9).

7. A gas spark switch as claimed in claim 3, wherein: the gasket (7) is made of red copper, the electrode holder (5) is made of brass, and the shell (3) is made of nylon.

8. A wire electric explosion circuit, characterized by: comprising a gas spark switch according to any one of claims 1 to 7, as well as a charging power supply (11), an energy storage capacitor (12), a bleeding unit (13), a wire load (14) and a compressed air pump (15);

the charging power supply (11) and the bleeder unit (13) are connected in parallel at two ends of the energy storage capacitor (12), and the bleeder unit (13) comprises a bleeder switch and a bleeder resistor which are connected in series;

the electrode holder (5) of the lower seat body (2) of the gas spark switch (10) is connected to one end of the energy storage capacitor (12), the electrode holder (5) of the upper seat body (1) of the gas spark switch (10) is connected to one end of the metal wire load (14) through a high-voltage cable, and the other end of the metal wire load (14) is divided into two paths which are respectively connected to the other end of the energy storage capacitor (12) and the ground;

and an air outlet pipe of the compressed air pump (15) is connected to the air faucet (4), and an air pressure meter and a pressure release valve are arranged on the air outlet pipe.

9. A method for controlling a wire electric explosion circuit, which is characterized in that the circuit for wire electric explosion according to claim 8 is adopted, and comprises the following steps:

and (3) checking air tightness: checking the air tightness of the loop, and if the air tightness is good, performing the step of charging the energy storage capacitor;

charging of the energy storage capacitor: the energy storage capacitor (12) is charged through the charging power supply (11), so that the energy storage capacitor (12) reaches a set voltage value;

wire load operation: discharging gas in the gas spark switch (10) through the pressure release valve, enabling the barometer to reach a first set pressure, enabling the gas spark switch (10) to break down, enabling the energy storage capacitor (12) to discharge to the metal wire load (14), enabling the metal wire load (14) to work, and enabling the metal wire to be electrically exploded;

discharging the energy storage capacitor: and discharging the residual electric energy of the energy storage capacitor (12) through the discharge unit (13).

10. The method for controlling a wire electric explosion circuit according to claim 9, wherein the step of checking the airtightness specifically comprises:

starting the compressed air pump (15), inflating the cavity in the gas spark switch (10) through an air outlet pipe, and observing the reading of the barometer after the barometer reaches a second set pressure;

if the reading can be kept constant, the airtightness is good, and then the step of charging the energy storage capacitor (12) is carried out;

if the reading changes, the air outlet pipe is reconnected, and then the air tightness checking step is carried out again.

Technical Field

The application belongs to the technical field of pulse power, and particularly relates to a gas spark switch, a metal wire electric explosion loop and a control method thereof.

Background

In the experiment of metal wire electric explosion in water, the gas spark switch is used as an energy control part in a pulse source, and the breakdown performance and the stability performance of the gas spark switch have important significance on the effect and the repeatability of the metal wire electric explosion. When the metal wire is applied to electric explosion under the condition of hundreds kilojoule level capacitor energy storage at present, the maximum current passing through a switch reaches hundreds kiloamperes level, the pulse width reaches more than 600 microseconds, and the passing charge quantity is more than tens of coulombs. The traditional small two-electrode gas spark switch and the trigger switch are no longer suitable for the passing charge amount of the metal wire electric explosion, and the traditional gas spark switch can cause the serious ablation of the electrode and the insulating material, thereby leading the switch to be scrapped in advance.

Disclosure of Invention

The embodiment of the application solves the problem that when the traditional gas spark switch is applied to metal wire electric explosion, the electrode and the insulating material of the gas spark switch are seriously ablated due to overlarge electric charge amount.

The embodiment of the invention provides a gas spark switch, which comprises an upper seat body, a lower seat body and a shell with a cylindrical structure;

the upper seat body and the lower seat body are identical in structure, the upper seat body and the lower seat body are symmetrically arranged at the upper end and the lower end of the shell, the upper seat body, the lower seat body and the shell form a sealing structure with a cavity inside, and the side wall of the shell is provided with an air nozzle for inflating and deflating the cavity inside the shell;

the upper seat body and the lower seat body respectively comprise an electrode seat and a graphite electrode connected to one end of the electrode seat, the graphite electrode extends into the shell, and the electrode seats are arranged at the end part of the shell;

the graphite electrode of the upper seat body and the graphite electrode of the lower seat body are arranged oppositely and at intervals.

In a possible implementation manner, the graphite electrodes of the upper base body and the graphite electrodes of the lower base body are arranged at intervals of 9-11 mm.

In a possible implementation manner, a gasket is further disposed between the graphite electrode and the electrode holder, and the gasket is used for adjusting a distance between the graphite electrode of the upper base body and the graphite electrode of the lower base body.

In a possible implementation manner, the graphite electrode and the electrode holder are connected through threads, a threaded hole is formed in the end portion of the graphite electrode, and a stud matched with the threaded hole is arranged at the end portion of the electrode holder.

In a possible implementation manner, the electrode holder further comprises a protective shell for fixing the upper holder body and the lower holder body, and a bolt sequentially penetrates through the protective shell and the holes in the electrode holder and then is screwed into the threaded hole in the shell.

In a possible implementation, the outer side wall of the housing is provided with a plurality of spherical protrusions.

In one possible implementation manner, the gasket is made of red copper, the electrode holder is made of brass, and the shell is made of nylon.

The embodiment of the invention also provides a metal wire electric explosion loop which comprises the gas spark switch, a charging power supply, an energy storage capacitor, a discharge unit, a metal wire load and a compressed air pump;

the charging power supply and the bleeder unit are connected in parallel at two ends of the energy storage capacitor, and the bleeder unit comprises a bleeder switch and a bleeder resistor which are connected in series;

the electrode holder of the lower seat body of the gas spark switch is connected to one end of the energy storage capacitor, the electrode holder of the upper seat body of the gas spark switch is connected to one end of the metal wire load through a high-voltage cable, and the other end of the metal wire load is divided into two paths which are respectively connected to the other end of the energy storage capacitor and the ground;

and an air outlet pipe of the compressed air pump is connected with the air faucet, and an air pressure meter and a pressure release valve are arranged on the air outlet pipe.

The embodiment of the invention also provides a control method of the metal wire electric explosion loop, which adopts the metal wire electric explosion loop and specifically comprises the following steps:

and (3) checking air tightness: checking the air tightness of the loop, and if the air tightness is good, performing the step of charging the energy storage capacitor;

charging of the energy storage capacitor: the energy storage capacitor is charged through the charging power supply, so that the energy storage capacitor reaches a set voltage value;

wire load operation: discharging the gas in the gas spark switch through the pressure release valve, enabling the barometer to reach a first set pressure, at the moment, enabling the gas spark switch to be broken down, enabling the energy storage capacitor to discharge to the metal wire load, enabling the metal wire load to work, and enabling the metal wire to be electrically exploded;

discharging the energy storage capacitor: and releasing the residual electric energy of the energy storage capacitor through the discharge unit.

In a possible implementation, the step of checking for gas tightness specifically comprises:

starting the compressed air pump, inflating the cavity in the gas spark switch through an air outlet pipe, and observing the reading of the barometer after the barometer reaches a second set pressure;

if the reading can be kept constant, the air tightness is good, and then the step of charging the energy storage capacitor is carried out;

if the reading changes, the air outlet pipe is reconnected, and then the air tightness checking step is carried out again.

One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

the embodiment of the invention provides a gas spark switch, a metal wire electric explosion loop and a control method thereof. The discharge area of the graphite electrode is opposite and more concentrated, so the uniformity of the electric field is good. When the gas spark switch discharges, the graphite is directly converted from a solid state to a gas state by the heat of current passing through, so that the probability of early scrapping of the switch caused by electrode ablation due to the fact that the graphite is converted into the liquid state is reduced. Compared with the prior art, the gas spark switch has less ablation pollution caused by discharge and more convenient installation and disassembly, thereby meeting the control requirement of the metal wire electric explosion of the hundred kilojoule level capacitor energy storage.

The invention adopts air as insulating gas, is beneficial to the transportation and installation of field equipment, and has high safety; the graphite electrode and air mainly generate carbon dioxide under the action of electric arc, and the carbon dioxide has certain insulating property, so that the air serving as insulating gas can meet the use requirement of the gas spark switch.

The solid-liquid ablation change of the traditional metal electrode can be accompanied by more floating metal powder to be adhered on the insulating inner wall, and uneven ablation pits can be left on the surface of the electrode when the metal electrode is converted into a liquid state, so that the surface distance between the two electrodes and the unevenness of an electric field between the two electrodes are changed, and the stability of discharge is influenced. When the gas spark switch is switched on, the two graphite electrodes generate surface ablation pits due to arc discharge, and the ablation of the graphite electrodes is separated from the surfaces of the electrodes in a sublimation mode, so that the pits on the surfaces of the electrodes can be avoided, and meanwhile, the pollution to insulation can be greatly reduced due to gas ablation products.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a gas spark switch according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a wire electric explosion circuit according to an embodiment of the present invention.

Reference numerals: 1-an upper seat body; 2-a lower seat body; 3-a housing; 4-air tap; 5-electrode holder; 6-a graphite electrode; 7-a gasket; 8-protective shell; 9-bulge; 10-gas spark switch; 11-a charging power supply; 12-an energy storage capacitor; 13-a bleed unit; 14-wire loading; 15-compressed air pump.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

As shown in fig. 1, a gas spark switch according to an embodiment of the present invention includes an upper housing 1, a lower housing 2, and a cylindrical housing 3.

The structure of going up pedestal 1 and lower pedestal 2 is the same, goes up pedestal 1 and sets up in shell 3 upper end and lower extreme with lower pedestal 2 symmetry, goes up pedestal 1, lower pedestal 2 and shell 3 and forms the inside seal structure that has the cavity, and the lateral wall of shell 3 is provided with the air cock 4 that is used for filling the gassing to the inside cavity of shell 3.

Go up pedestal 1 and lower pedestal 2 and all include electrode holder 5 and connect in the graphite electrode 6 of 5 one ends of electrode holder, graphite electrode 6 stretches into the inside of shell 3, and electrode holder 5 is installed in the tip of shell 3.

The graphite electrode 6 of the upper seat body 1 and the graphite electrode 6 of the lower seat body 2 are arranged oppositely and at intervals.

It should be noted that, the electrode attributes of the upper seat body 1 and the lower seat body 2 are determined according to the connection mode of the circuit, and both the upper seat body 1 and the lower seat body 2 can be used as a positive electrode or a negative electrode, which is convenient for the connection of the gas spark switch and can improve the installation efficiency.

In the metal wire electric explosion in the water with the energy stored by the hundred kilojoules capacitance, the charge transfer quantity of the loop current can reach more than tens of coulombs, and the graphite electrode 6 has a larger ablation rate compared with the metal electrode under the condition of lower coulomb charge transfer quantity through tests. At high coulomb charge transfer, the graphite electrode 6 has a lower ablation rate than the metal electrode. Therefore, the invention selects graphite as the electrode material. The graphite material has the advantages of light weight, high melting point, good heat resistance, excellent thermal shock resistance, good chemical stability, heat conduction and electric conduction performance, can reduce the weight of the switch, and meets the requirements of miniaturization and light weight of equipment.

As shown in figure 1, the invention adopts the graphite electrode 6 with a larger area, and the pollution caused by the metal electrode erosion can be greatly reduced by directly gasifying the graphite electrode 6. The discharge area of the graphite electrode 6 is opposite and more concentrated, so the electric field uniformity is good.

The air in the cavity inside the housing 3 is chemically reacted by the discharge to mainly generate carbon dioxide having a general insulating property. Meanwhile, because the processing quality control and the ablation reaction are incomplete, the graphite small particle powder which is partially dropped off also exists, and the graphite small particle powder is suspended in the air of the cavity or adhered to the inner wall of the insulation cavity, so that the inside of the cavity needs to be ventilated, and the air tap 4 is arranged. Meanwhile, in order to reach a set insulation voltage value and avoid the advance breakdown of the gas spark switch 10, the air pressure added into the inner cavity of the shell 3 is generally large, and therefore the air tap 4 is arranged to realize one-way air charging and discharging, so that the breakdown voltage is relatively high. After the set insulation voltage value is reached, a gas bleeding operation is also required to reduce the breakdown voltage below the set insulation voltage value. During the gassing, the gas of the inside cavity of shell 3 is discharged, and the graphite tiny particle of inside is also taken out simultaneously to be favorable to the recovery of cavity internal insulation performance, and then improved gas spark switch 10's life.

When the gas spark switch 10 provided by the invention discharges, the graphite is directly converted from a solid state to a gas state by the heat of current passing through, so that the probability of switch scrapping in advance caused by electrode ablation due to the fact that the graphite is converted into a liquid state is reduced. Compared with the prior art, the gas spark switch 10 has less ablation pollution caused by discharge and more convenient assembly and disassembly, thereby meeting the control requirement of the metal wire electric explosion of the hundred kilojoule level capacitor energy storage.

In this embodiment, the graphite electrodes 6 of the upper housing 1 and the graphite electrodes 6 of the lower housing 2 are spaced apart by 10 mm.

It should be noted that, through experiments, the graphite electrode 6 of the upper seat body 1 and the graphite electrode 6 of the lower seat body 2 are arranged at a distance of 10mm, so that the discharge area of the graphite electrode 6 is opposite and relatively concentrated, and the electric field uniformity is good.

In this embodiment, a gasket 7 is further disposed between the graphite electrode 6 and the electrode holder 5, and the gasket 7 is used to adjust a distance between the graphite electrode 6 of the upper holder body 1 and the graphite electrode 6 of the lower holder body 2.

It should be noted that, the distance between the graphite electrode 6 of the upper base 1 and the graphite electrode 6 of the lower base 2 is adjusted by the gasket 7, which is not only convenient, but also can ensure the performance of the gas spark switch 10 when in use.

In this embodiment, the graphite electrode 6 and the electrode holder 5 are connected by a thread, a threaded hole is formed in an end portion of the graphite electrode 6, and a stud for being matched with the threaded hole is arranged on an end portion of the electrode holder 5.

It should be noted that the graphite electrode 6 and the electrode holder 5, which are screwed together, can improve the current transmission efficiency and ensure the performance of the gas spark switch 10.

In this embodiment, the electrode holder further comprises a protective shell 8 for fixing the upper seat body 1 and the lower seat body 2, and the bolt sequentially penetrates through the holes in the protective shell 8 and the electrode holder 5 and then is screwed into the threaded hole in the shell 3.

It should be noted that the shell 3 can be a column or a cube structure, the end of the shell 3 is provided with a step for installing the electrode holder 5, after the graphite electrode 6 is inserted into the inside of the shell 3, the electrode holder 5 is connected to the step in a clamping manner, the center of the protective shell 8 is provided with a hole for the connection end of the electrode holder 5 to pass through, and the circumferential direction of the protective shell 8 is provided with a plurality of mounting holes. The protective shell 8 and the electrode holder 5 can be firmly fixed on the shell 3 through bolts, and the bolts for fixing can be provided with spring gaskets 7 to prevent the bolts from loosening, so that the structural stability and the sealing performance of the gas spark switch 10 are realized, and meanwhile, the gas spark switch is convenient to detach and maintain.

In this embodiment, the outer side wall of the housing 3 is provided with a plurality of spherical protrusions 9.

It should be noted that, the spherical protrusions 9 can increase the friction coefficient and the insulation distance of the housing 3, facilitate holding by a person, and increase the creepage distance.

In this embodiment, the gasket 7 is made of red copper, the electrode holder 5 is made of brass, and the housing 3 is made of nylon.

It should be noted that the gasket 7 and the electrode holder 5 are made of materials capable of ensuring the efficiency of current transmission, and the shell 3 is made of materials with good insulating property and high strength, so that the gas spark switch 10 is suitable for the use requirements of the gas spark switch of the invention.

As shown in fig. 1 and fig. 2, the embodiment of the present invention further provides a wire electric explosion circuit, which includes the above-mentioned gas spark switch 10, as well as a charging power source 11, an energy storage capacitor 12, a discharging unit 13, a wire load 14 and a compressed air pump 15.

The charging power supply 11 and the discharging unit 13 are connected in parallel to two ends of the energy storage capacitor 12, and the discharging unit 13 includes a discharging switch and a discharging resistor connected in series.

The electrode holder 5 of the lower seat body 2 of the gas spark switch 10 is connected with one end of the energy storage capacitor 12, the electrode holder 5 of the upper seat body 1 of the gas spark switch 10 is connected with one end of the metal wire load 14 through a high-voltage cable, and the other end of the metal wire load 14 is divided into two paths and respectively connected with the other end of the energy storage capacitor 12 and the ground.

An air outlet pipe of the compressed air pump 15 is connected with the air faucet 4, and an air pressure gauge and a pressure release valve are arranged on the air outlet pipe.

It should be noted that, the compressed air pump 15 is small in size and convenient to carry, so that the size and weight of equipment carried by workers can be reduced, transportation and installation of field equipment are facilitated, and meanwhile, the safety is high. The bleeder unit 13 is capable of discharging the remaining energy of the energy storage capacitor 12.

The air has good insulating property, the insulating property can be described by corresponding to 3kV by 1mm, meanwhile, the air pressure has obvious influence on the breakdown voltage, and in brief, the direct-current steady-state breakdown voltage of the gas spark switch 10 gradually rises along with the rise of the air pressure, and the air and the gas spark switch are in a linear relationship. The preset insulation voltage value is generally 15-30 kV, the insulation air pressure value is generally 0.4-0.6 MPa, so that other insulation gases with excellent insulation performance do not need to be selected, air is selected, the graphite electrode 6 and the air mainly generate carbon dioxide under the action of electric arcs, and the carbon dioxide has certain insulation performance and can meet the use requirement of the gas spark switch 10.

As shown in fig. 1 and fig. 2, an embodiment of the present invention further provides a method for controlling a wire electrical explosion circuit, where the method for controlling a wire electrical explosion circuit includes the following steps:

and (3) checking air tightness: checking the air tightness of the loop, and if the air tightness is good, performing the charging step of the energy storage capacitor 12. The tightness check ensures that the gas spark switch 10 is in good working condition.

Charging of the energy storage capacitor 12: the energy storage capacitor 12 is charged by the charging power supply 11, so that the energy storage capacitor 12 reaches a set voltage value.

Operation of the wire load 14: the gas in the gas spark switch 10 is discharged through the pressure relief valve, so that the barometer reaches a first set pressure, at the moment, the gas spark switch 10 breaks down, the energy storage capacitor 12 discharges to the metal wire load 14, and the metal wire load 14 works, so that the metal wire is electrically exploded.

Discharge of the energy storage capacitor 12: the residual electric energy of the energy storage capacitor 12 is discharged through the discharging unit 13. And closing the bleeder switch, and releasing the residual electric energy through the bleeder resistor.

It should be noted that, the solid-liquid ablation change of the traditional metal electrode is accompanied by the adhesion of more floating metal powder on the insulating inner wall, and when the metal electrode is converted into a liquid state, an uneven ablation pit is left on the surface of the electrode, so that the surface distance between the two electrodes and the electric field unevenness between the electrodes are changed, and the stability of discharge is affected. When the gas spark switch 10 of the invention is conducted, surface ablation pits are generated between the two graphite electrodes 6 due to arc discharge, and the ablation of the graphite electrodes 6 is separated from the electrode surface in a sublimation (solid-gas) mode, so that the pits on the electrode surface can be avoided, and meanwhile, the pollution to insulation can be greatly reduced by gas ablation products.

In this embodiment, the step of checking for airtightness specifically includes:

and starting the compressed air pump 15, inflating the cavity in the gas spark switch 10 through the air outlet pipe, and observing the reading of the barometer after the barometer reaches a second set pressure.

If the reading can be kept constant for ten seconds, the airtightness is good, and then the charging step of the energy storage capacitor 12 is performed.

If the reading changes, the air outlet pipe is reconnected, and then the air tightness checking step is carried out again. The gas tightness check is a precondition for ensuring the normal operation of the gas spark switch 10, and ensures that the internal cavity of the gas spark switch 10 can reach a set insulation voltage value, thereby avoiding the advance breakdown of the gas spark switch 10.

The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.