CN218569496U - Corona-assisted triggering gas switching device - Google Patents

Abstract

The utility model relates to a corona auxiliary trigger gas switching device, the device includes annular trigger electrode, ripples pearl screw, insulating inner tube, go up high tension electrode, lower high tension electrode, and a housing, trigger the needle, annular middle electrode, trigger set screw and bulb, the barrel one end embedding of ripples pearl screw is in the installation blind hole on annular middle electrode or annular trigger electrode lateral wall, the barrel opening be sharp arris shape and with insulating inner tube between gapped, ripples pearl sets up in the open end of barrel and with spring compression in the barrel, ripples pearl and the locating hole contact and the support electrode of setting on insulating inner tube, the device has solved the gas switch that exists among the prior art and has triggered the time delay shake great, trigger the high technical problem of threshold value, the device can reduce the switch time delay shake, reduce and trigger the threshold value, can effectively extend its application in gas switch.

Description

Corona-assisted triggering gas switching device

Technical Field

The utility model relates to a gas switching device, concretely relates to corona auxiliary trigger gas switching device.

Background

The gas switch has wide application in the technical field of pulse power, large-scale gas switches are required to be synchronously and accurately triggered by FLTD type and other large-scale pulse power sources, and the requirements of low triggering threshold and low delay jitter are provided for the triggering characteristics of the gas switches.

In order to improve the triggering characteristics of the gas switch, various methods for assisting in triggering the gas switch are proposed at home and abroad, such as preionization triggering, plasma jet triggering, micro-hollow cathode discharge triggering and the like, wherein the preionization triggering is an effective method for reducing the triggering delay and jitter of the switch, and the influence mechanism is as follows: the plasma formed by pre-ionization can directly provide initial electrons for the development of gap breakdown, and the ultraviolet light generated by pre-ionization discharge can cause space photo-ionization and the photoelectric effect of a cathode, which are beneficial to triggering breakdown of the gas gap and improve the triggering performance of a switch.

Corona discharge is a self-sustaining discharge phenomenon occurring in the vicinity of an electrode of extremely uneven field strength, and is a low-energy-consumption gas discharge form between gas insulation and spark discharge, which can be considered as a specific pre-ionization phenomenon. In gas switching studies, leakage current generated by corona discharge is mainly used to equalize multi-level switches, such as the multi-gap gas switch developed by the russian tomakes High Current Electronics Institute (HCEI) (see Kim a, frolov S, alexenko V, et al, pre-stability of the switch type fast LTD [ C ].17th International Pulsed Power reference, 2009 565-570), the four-gap gas switch developed by the northwest nuclear technology institute (see zingiber xiao, juniper, sun phoenix et al. However, there are also scholars at home and abroad that carry out gas pre-ionization in a spark gap by means of corona discharge so as to reduce the switch jitter, for example, a seven-stage self-breakdown corona stabilizing switch (reference data include Wanggang, zhang Xibo, liu Sheng, etc. for a hundred kilovolt multi-stage corona stabilizing switch [ J ] modern applied physics, 2019,3 (10): 030402) designed by Wanggang for a Tesla type trigger, the distance between two adjacent electrodes of the switch is equal, the electrode shapes are both of a 'knife-plate' structure, when the air pressure is 0.3MPa, the self-breakdown voltage is greater than 130kV, and the jitter is less than 10ns. However, this switch generates corona by the discharge electrode, and its structure cannot be applied to a gas switch having a large through-current due to the ablation problem. The pilot ionization effect is realized by designing an annular blade at the outer side of a cathode of an annular track switch in Yangan traffic university (reference data is shown in Yankangao, wanggang, wujia and the like, the pilot ionization ignition gas spark switch breakdown characteristic research [ C ] seventh national pulse conference and eighth national special power supply academic exchange conference argument set, intense laser and particle beam, 2021 ], a 120kV and 50Hz self-triggering pilot ionization gas switch is developed, the breakdown voltage jitter is reduced to 0.7 percent from 3 percent, although the trigger structure is simplified to a certain degree, the pilot ionization gas switch is only used in a pulse gas switch with high frequency, high voltage and lower power.

SUMMERY OF THE UTILITY MODEL

The utility model provides a corona auxiliary triggering gas switching device produces corona auxiliary triggering gas switch through utilizing the radial bearing structure wave pearl screw of annular trigger electrode, has solved the gas switch that exists among the prior art and has triggered the technical problem that the time delay shake is great, trigger threshold value is high, uses the device can reduce switch time delay shake, reduces and triggers the threshold value, can effectively extend its application in gas switch.

The utility model provides a technical solution as follows:

a corona auxiliary trigger gas switch device comprises a shell, an insulating inner cylinder nested in the shell, an annular trigger electrode and a plurality of annular middle electrodes which are coaxially arranged in the insulating inner cylinder, a high-voltage electrode, a low-voltage electrode and a trigger needle, wherein the high-voltage electrode and the low-voltage electrode are respectively arranged at the upper end and the lower end of the insulating inner cylinder; it is characterized in that:

the device also comprises a plurality of bead screws arranged on the outer side walls of the annular middle electrode and the annular trigger electrode;

the annular middle electrode and the annular trigger electrode are identical in structure, at least three mounting blind holes are uniformly formed in the axial center faces of the outer side walls of the annular middle electrode and the annular trigger electrode, and wave ball screws are embedded in the mounting holes; the insulating inner cylinder is provided with positioning holes along the axial circumference at positions corresponding to the mounting holes;

the wave bead screw comprises a cylinder body, a spring and a wave bead, wherein the cylinder body is embedded into the mounting hole, and the opening is formed in one end of the cylinder body;

the opening end of the cylinder body faces outwards along the radial direction of the annular trigger electrode or the annular middle electrode, and the end surface of the outer wall of the opening end is set to be a conical surface structure to form a sharp-edge-shaped opening end; the wave beads are positioned at the opening end of the cylinder body, the diameter of the wave beads is larger than that of the positioning hole in the insulating inner cylinder, and the elastic force of the spring enables the wave beads to be in contact with the positioning hole in the insulating inner cylinder and connects the annular trigger electrode or the annular middle electrode to the insulating inner cylinder;

a gap of 0.2-1 mm is formed between the sharp-edge-shaped opening end of the cylinder body and the insulating inner cylinder;

the glass bead screw is made of metal materials such as stainless steel, and the insulating inner cylinder is made of insulating materials such as polytetrafluoroethylene, nylon or ceramics.

Furthermore, the trigger needle and the annular trigger electrode are arranged in the middle of the upper high-voltage electrode and the lower high-voltage electrode, and the annular trigger electrode is made of the same material as the annular middle electrode;

a sealing ring is arranged between the side face of the trigger needle and the shell, the trigger needle is fixed on the shell through a trigger fixing screw, a trigger introducing hole for the trigger needle to penetrate through is formed in the side wall of the insulating inner cylinder, one end, located on the insulating inner cylinder, of the trigger needle is in contact with the annular trigger electrode, and a ball head is installed at the other end of the trigger needle.

Furthermore, the upper high-voltage electrode, the lower high-voltage electrode and the shell form a sealed cylindrical cavity, the upper high-voltage electrode and the lower high-voltage electrode are made of metal conductors, and the shell is made of an insulating material;

the horizontal discharge cross section of the upper high-voltage electrode and the horizontal discharge cross section of the lower high-voltage electrode are the same as the horizontal discharge cross section of the annular trigger electrode.

Furthermore, the number of the annular middle electrodes is four, and the annular middle electrodes are symmetrically arranged on the upper side and the lower side of the annular trigger electrode;

the distance between the lower surface of the upper high-voltage electrode and the adjacent annular middle electrode, the distance between the two adjacent annular middle electrodes, the distance between the annular trigger electrode and the adjacent annular middle electrode, and the distance between the upper surface of the lower high-voltage electrode and the adjacent annular middle electrode are the same.

Furthermore, the number of the wave ball screws arranged on the annular middle electrode and each annular trigger electrode is 3;

the installation angles of the wave bead screws between the adjacent annular middle electrodes and between the annular middle electrode and the annular trigger electrode are staggered by 60 degrees.

Further, the distance between the annular trigger electrode and the adjacent annular middle electrode is 3mm;

the gap distance between the opening end of the pointed prism of the cylinder body and the insulating inner cylinder is 0.5mm.

The utility model has the advantages that:

1. the utility model provides a corona auxiliary triggering gas switching device, the barrel of the ripples pearl screw that adopts is provided with outstanding sharp arris shape open end, has 0.5 mm's clearance between sharp arris shape open end and the insulating inner tube, can produce the corona when charging and triggering, provides initial electron for the switch clearance, effectively reduces switch delay jitter, reduces the trigger threshold value, and corona auxiliary triggering method effect is obvious, and delay jitter reduces to 1 nanosecond by several nanoseconds;

2. compared with the prior art, the corona auxiliary triggering gas switch device provided by the utility model has the advantages that the auxiliary triggering mode has a simple structure, no complex additional structure is needed to be added, the corona auxiliary triggering is realized by the wave bead screw of the triggering electrode supporting structure, the production cost is saved, and the operation is simple;

3. the utility model provides a corona auxiliary trigger gas switching device, the switching electrode simple to operate, will be embedded into annular trigger electrode lateral wall mounting hole with the ripples pearl screw earlier, and then pack into insulating inner tube, ripples pearl and insulating inner tube locating hole cooperation are compressed tightly by the spring, and self-adaptation regulation, positioning accuracy are high;

4. the utility model provides a corona auxiliary trigger gas switching device, 4 electrode and 1 annular trigger electrode total 5 layers of electrodes in the middle of the annular, the wave pearl screw's of every layer of electrode installation angle 60 degrees that stagger has improved the edgewise dielectric strength of insulating inner tube.

Drawings

Fig. 1 is a cross-sectional view of an embodiment of a corona assisted six-gap gas switch;

FIG. 2 is a schematic view of an embodiment of the present invention illustrating an installation of a ring-shaped trigger electrode and a wave ball screw;

FIG. 3 is a schematic view of a ball screw structure of an annular trigger electrode according to an embodiment of the present invention;

fig. 4 is a delay and jitter curve of the corona-assisted six-gap gas switch under the trigger voltage of 110kV in the embodiment of the present invention;

fig. 5 is a time delay and jitter curve of the corona-assisted six-gap gas switch under different trigger voltages in the embodiment of the present invention;

fig. 6 is the embodiment of the present invention, wherein the corona assisted triggering six-gap gas switch measures the time delay variation curve for 2000 triggering experiments.

The reference numbers are as follows:

1-annular trigger electrode, 2-wave bead screw, 201-wave bead, 202-cylinder, 203-spring, 3-insulating inner cylinder, 4-upper high-voltage electrode, 5-lower high-voltage electrode, 6-shell, 7-trigger needle, 8-annular middle electrode, 9-trigger fixing screw and 10-ball head.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and examples.

As shown in fig. 1, the utility model provides a corona-assisted triggering gas switching device, including shell 6, the insulating inner tube 3 of nestification in shell 6, coaxial setting is annular trigger electrode 1 and a plurality of annular middle electrode 8 in insulating inner tube 3, set up respectively at insulating inner tube 3 upper and lower both ends high-voltage electrode 4, lower high-voltage electrode 5, and trigger needle 7, one end of trigger needle 7 passes shell 6 in proper order, insulating inner tube 3 contacts with annular trigger electrode 1, still include a plurality of ripples pearl screws 2 of setting on annular middle electrode 8 and annular trigger electrode 1 lateral wall, annular middle electrode 8 and annular trigger electrode 1 structure are the same, annular middle electrode 8 and annular trigger electrode 1 lateral wall evenly open three installation blind holes at the axial central plane, embedding ripples pearl screw 2 in the installation blind hole; the insulating inner cylinder 3 is provided with positioning holes at the positions corresponding to the mounting blind holes along the axial circumference;

as shown in fig. 3, the wave ball screw 2 includes a cylinder 202 inserted into the mounting hole and having an opening at one end, a spring 203 and a wave ball 201 sequentially disposed in the cylinder 202 from inside to outside; the opening end of the cylinder 202 faces outwards along the radial direction of the annular trigger electrode 1 or the annular middle electrode 8, and the outer wall end face of the opening end is set to be a conical surface structure to form a sharp-edge-shaped opening end; the wave bead 201 is positioned at the opening end of the cylinder 202, the diameter of the wave bead 201 is larger than that of the positioning hole on the insulating inner cylinder 3, the elastic force of the spring 203 enables the wave bead 201 to be in contact with the positioning hole on the insulating inner cylinder 3 and connects the annular trigger electrode 1 or the annular middle electrode 8 on the insulating inner cylinder 3, and a gap of 0.5mm is formed between the sharp edge-shaped opening end of the cylinder 202 and the insulating inner cylinder 3; the trigger needle 7 and the annular trigger electrode 1 are arranged in the middle of the upper high-voltage electrode 4 and the lower high-voltage electrode 5, the annular trigger electrode 1 is made of the same material as the annular middle electrode 8, a sealing ring is arranged between the side surface of the trigger needle 7 and the shell 6, the trigger needle 7 is fixed on the shell 6 through a trigger fixing screw 9, a trigger introduction hole for the trigger needle 7 to penetrate through is formed in the side wall of the insulating inner cylinder 3, one end of the trigger needle 7, which is positioned in the insulating inner cylinder 3, is in contact with the annular trigger electrode 1, the other end of the trigger needle 7 is provided with a ball head 10, and the ball head 10 is used for fixing the connection of a trigger introduction cable;

the upper high-voltage electrode 4, the lower high-voltage electrode 5 and the shell 6 are fixed through threads, the upper high-voltage electrode 4, the lower high-voltage electrode 5 and the shell 6 form a sealed cylindrical cavity, the discharge horizontal cross section of the upper high-voltage electrode 4 and the discharge horizontal cross section of the lower high-voltage electrode 5 are the same as the horizontal cross section of the annular trigger electrode 1, the four annular middle electrodes 8 are symmetrically arranged on the upper side and the lower side of the annular trigger electrode 1, and the mounting angles of the bead screws 2 between the adjacent annular middle electrodes 8 and between the annular middle electrodes 8 and the annular trigger electrode 1 are staggered by 60 degrees; the distance between the lower surface of the upper high-voltage electrode 4 and the adjacent annular middle electrode 8, the distance between two adjacent annular middle electrodes 8, the distance between the annular trigger electrode 1 and the adjacent annular middle electrode 8, and the distance between the upper surface of the lower high-voltage electrode 5 and the adjacent annular middle electrode 8 are all 3mm.

In the embodiment, the outer diameter of the adopted insulating inner cylinder 3 is 70mm, the inner diameter is 60mm, and the height is 132mm; the aperture of 3 positioning holes arranged on the insulating inner cylinder 3 is 4mm, the distance between the central planes of adjacent annular middle electrodes 8 is 21mm, and the inner insulating cylinder 3 is made of nylon; the diameter of the annular trigger electrode 1 is 46mm, the inner diameter is 30mm, the height is 18mm, the section is semicircular, the radius is 4mm, the aperture of three blind holes formed in the annular trigger electrode 1 is 8mm, the depth is 6mm, the diameter of the wave bead screw 2 is 8mm, the diameter of the wave bead 201 is 6mm, and the distance from the opening of the sharp prism to the bottom of the cylinder 202 is 12.5mm; the diameter of the trigger needle 7 is 5mm.

The wave bead screw 2, the annular trigger electrode 1, the high voltage electrode 4 and the low voltage electrode 5 are all made of stainless steel, and the shell 6 is made of organic glass.

The working medium of the gas switch of the embodiment adopts dry compressed air.

The utility model discloses the working process that the switch triggered as follows: the two ends of the switch are applied with +/-80 kV direct-current high voltage, at the moment, the annular trigger electrode 1 is positioned at the symmetrical axial position of the upper high-voltage electrode 4 and the lower high-voltage electrode 5, and the potential of the annular trigger electrode 1 is zero; the positive high-voltage pulse with the leading edge of 20ns and the amplitude of 110kV is applied to the trigger needle 7, the electric potentials of the bead screw 2 and the annular trigger electrode 1 are the same and are both increased to 110kV, the dielectric constant of the insulating inner cylinder 3 is several times that of gas, the electric field intensity of a gap between the sharp-edge-shaped opening end of the cylinder 202 and the insulating inner cylinder 3 is increased due to capacitance voltage division, and strong corona is generated at the sharp-edge-shaped opening end of the cylinder 202 to provide initial electrons for a gas switch gap, meanwhile, under the combined action of rapid increase of the gap electric field of the annular trigger electrode 1 and the annular middle electrode 8, the gap is broken down, then, a half of the gap with the negative polarity is completely broken down, then the potential of the annular trigger electrode 1 is turned over, and the other half of the switch gap is broken down due to electric field distortion, overvoltage causes the breakdown, so that the whole gas switch is triggered and closed. Due to the corona auxiliary triggering mode, initial electrons are provided for the breakdown development of the triggering gap, the time delay jitter of the switch can be effectively reduced, and the triggering threshold value is reduced.

As shown in fig. 4, the experiment is surveyed and is adopted the utility model discloses six clearance gas switches around time delay and shake curve under 110kV trigger voltage, wherein do not adopt the utility model discloses a six clearance gas switches, electrode adopt insulating radial support post. The switch working voltage is +/-80 kV, the trigger voltage is 110kV, the leading edge is 20ns, 50 continuous triggers are respectively generated under different working coefficients (60%, 70% and 80%), the switch trigger delay and the jitter are both remarkably reduced, and the jitter is reduced from a plurality of nanoseconds to 1 nanosecond.

As shown in FIG. 5, the experiment was measured and was adopted the utility model discloses six clearance gas switches time delay and shake curve under different trigger voltage, operating voltage 80kV, trigger pulse leading edge 20ns, different trigger voltage (110 kV, 70kV, 30 kV), respectively trigger 50 in succession under the different work coefficient (60%, 70%, 80%) and send out. It can be seen that under the condition of equivalent trigger delay jitter, the switch trigger voltage is reduced from 110kV to 30kV.

As shown in FIG. 6, the experiment is surveyed and is adopted the utility model discloses six clearance gas switches are at operating voltage 80kV, work coefficient 60%, trigger voltage 90kV, leading edge 20ns, and continuous operation 2000 times obtains the switch delay variation curve switch and does not take place self discharge phenomenon, and time delay 36.4ns, shake 1.1ns.

The description has given the full explanation to the contents of the utility model, and the concrete parameters of each component can be set according to the actual needs, and the ordinary technical personnel can be enough to implement through the contents of the description of the utility model. Any modification based on the idea of the invention falls within the scope of the right of the invention in the framework of the claims.

Claims (6)

1. A corona auxiliary trigger gas switch device comprises a shell (6), an insulating inner cylinder (3) embedded in the shell (6), an annular trigger electrode (1) and a plurality of annular middle electrodes (8) which are coaxially arranged in the insulating inner cylinder (3), a high-voltage electrode (4) and a low-voltage electrode (5) which are respectively arranged at the upper end and the lower end of the insulating inner cylinder (3), and a trigger needle (7), wherein one end of the trigger needle (7) sequentially penetrates through the shell (6) and the insulating inner cylinder (3) to be in contact with the annular trigger electrode (1); the method is characterized in that:

the device also comprises a plurality of bead screws (2) arranged on the outer side walls of the annular middle electrode (8) and the annular trigger electrode (1);

the annular middle electrode (8) and the annular trigger electrode (1) are identical in structure, at least three mounting blind holes are uniformly formed in the axial center plane of the outer side walls of the annular middle electrode (8) and the annular trigger electrode (1), and wave ball screws (2) are embedded in the mounting blind holes; the insulating inner cylinder (3) is provided with positioning holes along the axial circumference at positions corresponding to the mounting blind holes;

the wave bead screw (2) comprises a cylinder (202) which is embedded into the mounting blind hole and is provided with an opening at one end, and a spring (203) and a wave bead (201) which are sequentially arranged in the cylinder (202) from inside to outside;

the opening end of the cylinder (202) faces outwards along the radial direction of the annular trigger electrode (1) or the annular middle electrode (8), and the end face of the outer wall of the opening end is set to be a conical surface structure to form a sharp-edge-shaped opening end; the wave bead (201) is positioned at the opening end of the cylinder body (202), the diameter of the wave bead (201) is larger than that of a positioning hole in the insulating inner cylinder (3), and the elastic force of the spring (203) enables the wave bead (201) to be in contact with the positioning hole in the insulating inner cylinder (3) and connects the annular trigger electrode (1) or the annular middle electrode (8) to the insulating inner cylinder (3);

a gap of 0.2-1 mm is formed between the sharp edge-shaped opening end of the cylinder body (202) and the insulating inner cylinder (3);

the wave bead screw (2) is made of metal materials such as stainless steel, and the insulating inner cylinder (3) is made of insulating materials such as polytetrafluoroethylene, nylon or ceramics.

2. Corona assisted trigger gas switching device according to claim 1, characterized in that:

the trigger needle (7) and the annular trigger electrode (1) are arranged in the middle of the upper high-voltage electrode (4) and the lower high-voltage electrode (5), and the annular trigger electrode (1) is made of the same material as the annular middle electrode (8);

be equipped with the sealing washer between the side of trigger needle (7) and shell (6), trigger needle (7) are fixed on shell (6) through triggering set screw (9), are provided with the trigger that supplies trigger needle (7) to pass on insulating inner tube (3) lateral wall and introduce the hole, trigger needle (7) are located the one end and the contact of annular trigger electrode (1) of insulating inner tube (3), and bulb (10) are installed to the other end of trigger needle (7).

3. Corona assisted triggered gas switching device according to claim 2, characterized in that:

the upper high-voltage electrode (4), the lower high-voltage electrode (5) and the shell (6) form a sealed cylindrical cavity, the upper high-voltage electrode (4) and the lower high-voltage electrode (5) are made of metal conductors, and the shell (6) is made of an insulating material;

the horizontal discharge cross section of the upper high-voltage electrode (4) and the lower high-voltage electrode (5) is the same as the horizontal discharge cross section of the annular trigger electrode (1).

4. Corona assisted triggering gas switching device according to any of claims 1-3, characterized in that:

the number of the annular middle electrodes (8) is four, and the annular middle electrodes are symmetrically arranged on the upper side and the lower side of the annular trigger electrode (1);

the distance between the lower surface of the upper high-voltage electrode (4) and the adjacent annular middle electrode (8), the distance between two adjacent annular middle electrodes (8), the distance between the annular trigger electrode (1) and the adjacent annular middle electrode (8), and the distance between the upper surface of the lower high-voltage electrode (5) and the adjacent annular middle electrode (8) are the same.

5. Corona assisted trigger gas switching device according to claim 4, characterized by:

all install 3 ripples pearl screw (2) on the lateral wall of annular intermediate electrode (8) and shape trigger electrode (1), the installation angle of ripples pearl screw (2) between adjacent annular intermediate electrode (8), between annular intermediate electrode (8) and annular trigger electrode (1) staggers 60 degrees.

6. Corona assisted trigger gas switching device according to claim 5, characterized in that:

the distance between the annular trigger electrode (1) and the adjacent annular middle electrode (8) is 3mm;

the gap distance between the opening end of the pointed prism of the cylinder (202) and the insulating inner cylinder is 0.5mm.

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