A pseudo spark switch

Abstract

The present invention discloses a pseudo spark switch, comprising a pseudo spark switch body, wherein the pseudo spark switch body comprises a cathode sealing part, an insulating shell, a hollow cathode, a hollow anode and an anode sealing part, and the pseudo spark switch further comprises a triggering pole, an insulator, a triggering power supply and a discharge circuit, so as to trigger the pseudo spark switch to work through discharge of the discharge circuit, thereby improving the working efficiency of the pseudo spark switch, so that the pseudo spark switch can be applied to working scenes with high time requirements.

Description

Technical Field

[0001] The invention relates to the technical field of gas discharge switches, and in particular to a pseudo spark switch. Background Art

[0002] The pseudo-spark switch is a gas discharge switch that works on the left branch of the Paschen curve. Its internal gas pressure is about tens of Pascals, similar to a hydrogen thyratron. The positive and negative electrodes of the pseudo-spark switch are both hollow structures and work under the hollow cathode effect state. When the hollow cathode discharges, the plasma inside the pseudo-spark switch forms a virtual anode under the action of the hollow cathode. A cathode sheath is formed between the virtual anode and the hollow cathode. The electric field inside the cathode sheath is very strong. When the electrons gain energy in the cathode sheath, they collide with gas molecules to form a high-density plasma. Therefore, the working current of the pseudo-spark switch can reach 200kA. When the working current is reversed, the hollow anode of the pseudo-spark switch becomes a hollow cathode. Under the hollow cathode effect state, its reverse current passing capacity can reach 90% of the working current, and it is widely used in the field of high-power pulse technology. Existing pseudo-spark switches generally have hydrogen storage devices to adjust the working state of the pseudo-spark switch, but the hydrogen storage device needs to be heated by an external power source for about 5 minutes before releasing hydrogen, which affects the efficiency and is not applicable in some working scenarios with high time response requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the hydrogen storage device of the existing pseudo-spark switch needs to be preheated for about 5 minutes before use, which affects the efficiency and makes it not suitable for certain scenarios with high time requirements. Therefore, a pseudo-spark switch with the hydrogen storage device removed is provided. By directly filling the pseudo-spark switch with inert gas, the hydrogen heating time is saved, so that the pseudo-spark switch can be used in working scenarios with high time response requirements.

[0004] The present invention is achieved through the following technical solutions:

[0005] A pseudo spark switch, comprising a pseudo spark switch body, wherein the pseudo spark switch body comprises a cathode sealing member, an insulating shell, a hollow cathode, a hollow anode and an anode sealing member, and the pseudo spark switch further comprises a trigger pole, an insulator, a trigger power supply and a discharge circuit;

[0006] One end of the insulating shell is connected to an anode sealing part, and the other end is connected to a cathode sealing part. The insulating shell, the anode sealing part and the cathode sealing part form a closed cavity, and the closed cavity is filled with an inert gas; in the closed cavity, the hollow anode is connected to the anode sealing part, and the hollow cathode is connected to the cathode sealing part. The cathode sealing part, the insulator and the trigger pole are arranged in sequence from the outside to the inside, and the trigger pole coincides with a surface of the insulator close to the anode sealing part; the trigger pole is connected to one end of the trigger power supply, and the other end of the trigger power supply is connected to the cathode feed connector of the discharge circuit, the anode feed connector of the discharge circuit is connected to the anode sealing part, the cathode feed connector of the discharge circuit is connected to the cathode sealing part, and the cathode sealing part is grounded.

[0007] Furthermore, the discharge circuit includes a charging power supply, a diode, a high-voltage capacitor and a charging current-limiting resistor;

[0008] The positive electrode of the charging power supply is connected to the anode of the diode, and the cathode of the diode is connected to one end of the high-voltage capacitor to serve as the anode feeding connector of the discharge circuit; the negative electrode of the charging power supply is connected to one end of the charging current limiting resistor, and the other end of the charging current limiting resistor is connected to the other end of the high-voltage capacitor to serve as the cathode feeding connector of the discharge circuit.

[0009] Furthermore, a layer of metal film is plated on the upper surface of the insulator, and the metal film is made of a material whose conductivity reaches a preset value when the pseudo spark switch is in operation.

[0010] Furthermore, the thickness of the metal film is 100-300 nm.

[0011] Furthermore, the insulating shell is made of ceramic material.

[0012] Furthermore, the cathode sealing component and the anode sealing component are made of Kovar alloy.

[0013] Furthermore, the hollow cathode and the hollow anode are made of WCu alloy material.

[0014] Furthermore, the inert gas in the closed cavity is Ne gas.

[0015] Furthermore, the anode feed connector and the cathode feed connector are both coaxial structures.

[0016] Furthermore, the pseudo spark switch is a cylinder, the length of the cylinder is 45mm-55mm, and the diameter of the cylinder is 35mm-45mm.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] By removing the hydrogen storage device and discharging through the discharge circuit to make the pseudo spark switch work, the hydrogen heating time is saved, so that the pseudo spark switch can be used in working scenarios with high requirements for time response; removing the hydrogen storage device can effectively reduce the volume of the pseudo spark switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0020] Figure 1 The figure is a schematic structural diagram of a pseudo spark switch of the present invention.

[0021] Figure 2 The figure is a schematic diagram of the improved pseudo spark switch body structure of the present invention.

[0022] Marks and corresponding parts names in the attached drawings:

[0023] 1-trigger pole, 2-insulator, 3-cathode sealing part, 4-insulating shell, 5-hollow cathode, 6-hollow anode, 7-anode sealing part, 8-metal film, 9-anode feeding connector, 10-cathode feeding connector, 11-trigger power supply. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0025] Example

[0026] like Figure 1 As shown, the present invention provides a pseudo spark switch, including a pseudo spark switch body, the pseudo spark switch body includes a cathode sealing member 3, an insulating shell 4, a hollow cathode 5, a hollow anode 6 and an anode sealing member 7, and the pseudo spark switch also includes a trigger pole 1, an insulator 2, a trigger power supply 11 and a discharge circuit.

[0027] One end of the insulating shell 4 is connected to the anode sealing part 7, and the other end is connected to the cathode sealing part 3. The insulating shell 4, the anode sealing part 7 and the cathode sealing part 3 form a closed cavity, and the closed cavity is filled with inert gas; in the closed cavity, the anode sealing part 7 is connected to the hollow anode 6, and the cathode sealing part 3 is connected to the hollow cathode 5. The cathode sealing part 3, the insulator 2 and the trigger pole 1 are arranged in sequence from the outside to the inside, and the trigger pole 1 coincides with a side of the insulator 2 close to the anode sealing part 7; the trigger pole 1 is connected to one end of the trigger power supply 11, and the other end of the trigger power supply 11 is connected to the cathode feed connector of the discharge circuit, the anode feed connector of the discharge circuit is connected to the anode sealing part 7, the cathode feed connector 10 of the discharge circuit is connected to the cathode sealing part 3, and the cathode sealing part 3 is grounded.

[0028] Specifically, the cathode sealing member 3, the insulator 2 and the trigger electrode 1 are arranged in sequence from the outside to the inside, the distance between the trigger electrode 1 and the cathode sealing member 3 is 0.5 mm, and the trigger electrode 1 coincides with a surface of the insulator 2 close to the anode sealing member 7, so that the working voltage required for the pseudo spark switch is lower, thereby improving the reliability of the pseudo spark switch triggering process.

[0029] When the trigger power supply 11 is closed, the trigger discharge circuit is discharged, and the trigger electrode 1 and the hollow cathode 5 undergo breakdown discharge under the voltage provided by the trigger power supply 11, and plasma is generated in the hollow cathode 5. The electrons generated by the breakdown discharge of the trigger electrode 1 move to the hollow anode 6 under the action of the electric field generated by the hollow cathode 5 and the hollow anode 6, and a breakdown discharge occurs between the hollow cathode 5 and the hollow anode 6, and the pseudo spark switch starts to work, and the trigger power supply is turned off. The trigger power supply 11 in this embodiment refers to a device for generating a negative pulse voltage signal.

[0030] Furthermore, the discharge circuit includes a charging power supply, a diode, a high-voltage capacitor and a charging current-limiting resistor.

[0031] The positive electrode of the charging power supply is connected to the anode of the diode, and the cathode of the diode is connected to one end of the high-voltage capacitor to serve as the anode feed connector 9 of the discharge circuit; the negative electrode of the charging power supply is connected to one end of the charging current limiting resistor, and the other end of the charging current limiting resistor is connected to the other end of the high-voltage capacitor to serve as the cathode feed connector 10 of the discharge circuit.

[0032] The trigger voltage of the pseudo spark switch in this embodiment is 500V.

[0033] Specifically, before using the pseudo-spark switch, the charging power supply charges the high-voltage capacitor. After charging is completed, the trigger power supply 11 is turned on, and a breakdown discharge occurs between the trigger pole 1 and the hollow cathode 5. Under the action of the hollow anode 6, the electrons generated by the breakdown discharge of the trigger pole 1 move to the hollow anode 6, and the hollow cathode 5 generates plasma. Under the action of the plasma, the pseudo-spark switch starts to work, and then the discharge is maintained by the high-voltage capacitor until the charge stored in the high-voltage capacitor is released. The discharge ends and the pseudo-spark switch ends. The negative pole of the trigger power supply 11 is connected to the trigger pole 1, which can make the electrons generated by the trigger pole 1 more easily attracted by the anode, and the pseudo-spark switch can be turned on faster, reducing the conduction time and improving the response speed of the pseudo-spark switch.

[0034] Furthermore, a metal film 8 is plated on the upper surface of the insulator 2. The metal film 8 is made of a material whose electrical conductivity reaches a preset value when the pseudo spark switch is in operation.

[0035] The preset value refers to a preset value used to determine the conductivity of the metal film 8 when the pseudo spark switch is working. The preset value is a value close to the conductivity of a semiconductor, and the specific value can be determined by the user according to actual conditions. The metal film in this embodiment includes but is not limited to materials with good conductivity such as Cu and Al.

[0036] Specifically, a metal film 8 is plated on the upper surface of the insulator 2 to enhance the electric field near the hollow cathode 5, reduce the surface work function of the insulator 2, increase the probability of electron emission, make it easier to trigger the discharge process, reduce the trigger voltage, and improve the reliability of the pseudo spark switch.

[0037] Furthermore, the thickness of the metal film 8 is 100 to 300 nm.

[0038] Furthermore, the insulating shell 4 is made of ceramic material.

[0039] Furthermore, the cathode sealing member 3 and the anode sealing member 7 are made of Kovar alloy.

[0040] Furthermore, the hollow cathode 5 and the hollow anode 6 are made of WCu alloy material.

[0041] Specifically, the hollow cathode 5 and the hollow anode 6 are made of WCu alloy material to have the characteristics of both the refractory metal W and the heat conductive metal Cu.

[0042] Furthermore, the inert gas in the sealed cavity is Ne gas.

[0043] Furthermore, the anode feed connector 9 and the cathode feed connector 10 are both coaxial structures.

[0044] Furthermore, the pseudo spark switch is a cylinder with a length of 45mm-55mm and a diameter of 35mm-45mm.

[0045] Specifically, by removing the hydrogen storage device, the pseudo spark switch can be made into a cylinder with a length of 45mm-55mm and a diameter of 35mm-45mm, which effectively reduces the size of the pseudo spark switch.

[0046] By closing the trigger power supply, breakdown discharge occurs between the trigger electrode and the hollow cathode in the pseudo-spark switch, and the hollow cathode generates plasma. Under the action of the plasma, the pseudo-spark switch is triggered to work and discharge through the discharge circuit. The pseudo-spark switch is filled with inert gas, and there is no need to use a hydrogen storage device to generate gas for the pseudo-spark switch to work, which saves hydrogen heating time and improves work efficiency, making the pseudo-spark switch suitable for work scenarios with high time requirements. In addition, removing the hydrogen storage device can also effectively reduce the volume of the pseudo-spark switch; the cathode sealing part, insulator and trigger electrode are arranged in sequence from the outside to the inside, and the trigger electrode overlaps with the side of the insulator close to the anode sealing part to form a surface triggering method, and a layer of metal film is plated on the upper surface of the insulator to reduce the trigger voltage of the pseudo-spark switch and improve its working reliability.

[0047] Specifically, the specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pseudo spark switch, comprising a pseudo spark switch body, wherein the pseudo spark switch body comprises a cathode sealing member (3), an insulating shell (4), a hollow cathode (5), a hollow anode (6) and an anode sealing member (7), characterized in that: The pseudo spark switch also includes a trigger electrode (1), an insulator (2), a trigger power supply (11) and a discharge circuit; One end of the insulating shell (4) is connected to an anode sealing member (7), and the other end is connected to a cathode sealing member (3); the insulating shell (4), the anode sealing member (7) and the cathode sealing member (3) form a closed cavity, and the closed cavity is filled with an inert gas; in the closed cavity, the hollow anode (6) is connected to the anode sealing member (7), and the hollow cathode (5) is connected to the cathode sealing member (3); the cathode sealing member (3), the insulator (2) and the trigger electrode (1) are arranged in sequence from the outside to the inside, and the trigger electrode (1) overlaps with a surface of the insulator (2) close to the anode sealing member (7); The trigger electrode (1) is connected to one end of the trigger power supply (11), the other end of the trigger power supply (11) is connected to the cathode feed connector (10) of the discharge circuit, the anode feed connector (9) of the discharge circuit is connected to the anode sealing member (7), the cathode feed connector (10) of the discharge circuit is connected to the cathode sealing member (3), and the cathode sealing member (3) is grounded; The discharge circuit includes a charging power supply, a diode, a high-voltage capacitor and a charging current-limiting resistor; The positive electrode of the charging power supply is connected to the anode of the diode, and the cathode of the diode is connected to one end of the high-voltage capacitor to serve as an anode feed connector (9) of the discharge circuit; the negative electrode of the charging power supply is connected to one end of the charging current limiting resistor, and the other end of the charging current limiting resistor is connected to the other end of the high-voltage capacitor to serve as a cathode feed connector (10) of the discharge circuit; The upper surface of the insulator (2) is plated with a layer of metal film (8), and the metal film (8) is made of a material whose electrical conductivity reaches a preset value when the pseudo spark switch is in operation.

2. A pseudo spark switch according to claim 1, characterized in that: The thickness of the metal film (8) is 100-300 nm.

3. A pseudo spark switch according to claim 1, characterized in that: The insulating shell (4) is made of ceramic material.

4. A pseudo spark switch according to claim 1, characterized in that: The cathode sealing member (3) and the anode sealing member (7) are made of Kovar alloy.

5. A pseudo spark switch according to claim 1, characterized in that: The hollow cathode (5) and the hollow anode (6) are made of WCu alloy material.

6. A pseudo spark switch according to claim 1, characterized in that: The inert gas in the closed cavity is Ne gas.

7. A pseudo spark switch according to claim 1, characterized in that: The anode feed connector (9) and the cathode feed connector (10) are both coaxial structures.

8. A pseudo spark switch according to claim 1, characterized in that: The pseudo spark switch is a cylinder, the length of the cylinder is 45mm-55mm, and the diameter of the cylinder is 35mm-45mm.

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