A fast closing switch based on vacuum gap and method of using the same

Abstract

The application discloses a kind of quick closing switch based on real space gap and its using method, quick closing switch is composed of vacuum cavity and electromagnetic forming device, upper cover plate has input drainage plate and is connected with conductive rod, lower cover plate is concave structure, not only as lower electrode is connected with output drainage plate, and have the effect of flyer, between upper and lower cover plate, through ceramic shell insulation;When quick closing switch receives action signal, first make thyristor switch conduction, pulse capacitor group discharges to forming coil, and pulse large current flows in coil, so that forming coil generates a transient magnetic field, and the lower cover plate placed in the magnetic field induces the eddy current opposite to the coil, so that the lower cover plate is deformed at high speed under the action of electromagnetic repulsion and collides with the conductive rod, and the lower cover plate and the conductive rod form a compression joint or solid-phase welding effect, so that the switch is quickly closed, and the whole switch action process is completed within 50 μs, solve the problem of long mechanical switch action time.

Description

Technical Field

[0001] This invention belongs to the field of medium and high voltage fast closing switch technology, specifically relating to a fast closing switch based on a vacuum gap and its usage method. Background Technology

[0002] Electromagnetic pulse forming technology originated in the 1970s. It is a high-speed, high-energy forming method that uses magnetic force to deform metal workpieces, enabling metal materials to deform at speeds up to hundreds of meters per second. Because electromagnetic forming technology uses all electrical energy, the discharge energy is precisely controllable, resulting in good processing consistency.

[0003] Currently, fast mechanical switches are commonly used, with an action time of 30ms. However, due to the large size, complex structure, and numerous transmission links of mechanical operating mechanisms, reducing the action time is greatly limited. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a fast closing switch based on a vacuum gap and its usage method, which addresses the shortcomings of the prior art and solves the technical problem of excessively long mechanical switch operation time.

[0005] The present invention adopts the following technical solution:

[0006] A fast-closing switch based on a vacuum gap includes a vacuum chamber, a conductive rod inside the vacuum chamber connected to the top of the vacuum chamber, an electromagnetic forming coil below the vacuum chamber, one end of the electromagnetic forming coil being connected to the other end of the electromagnetic forming coil and a ground terminal via a thyristor switch and a pulse capacitor bank respectively, and a charger being connected in parallel across the two ends of the pulse capacitor bank.

[0007] Specifically, the vacuum chamber includes a ceramic shell, an upper cover plate on the top of the ceramic shell, a lower cover plate on the bottom of the ceramic shell, a flow guide plate on one side of the upper cover plate, an output flow guide plate on one side of the lower cover plate, and the upper end of the conductive rod is connected to the upper cover plate.

[0008] Furthermore, the radial gap between the conductive rod and the lower cover plate is 3 to 5 mm.

[0009] Furthermore, the withstand voltage between the conductive rod and the lower cover plate is 0–10 kV.

[0010] Furthermore, the lower cover plate has a concave structure.

[0011] Furthermore, a magnet collector is provided between the electromagnetic forming coil and the lower cover plate.

[0012] Furthermore, the gap between the magnet and the lower cover plate is 1-2 mm.

[0013] Specifically, the electromagnetic forming coil is either a solenoid made of flat copper wire or a biter coil.

[0014] Specifically, there are multiple fast-closing switches, which are connected in parallel, and the action time of each fast-closing switch is less than or equal to 50μs.

[0015] Another technical solution of the present invention is a method for using a fast-closing switch based on a vacuum gap. The charger charges and maintains the voltage of the pulse capacitor bank. The electromagnetic forming coil forms a discharge circuit through the pulse capacitor bank and the thyristor switch. When the fast-closing switch receives an action signal, the thyristor switch receives a trigger signal and turns on. The pulse capacitor bank discharges to the electromagnetic forming coil, generating a large pulse current in the coil. The magnetic field of the electromagnetic forming coil directly acts on the lower cover plate at the bottom of the vacuum cavity to generate induced eddy currents. Under the action of electromagnetic repulsion, the lower cover plate collides with the conductive rod at high speed. A pressing or solid-phase welding effect is formed between the lower cover plate and the conductive rod, so that the fast-closing switch closes quickly.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] This invention discloses a fast-closing switch based on a vacuum gap. It employs the principle of electromagnetic forming. When a pulsed high current flows through the coil, the magnetic field of the electromagnetic forming coil directly acts on the lower cover plate at the bottom of the vacuum cavity to generate induced eddy currents. Under the action of electromagnetic repulsion, the lower cover plate collides with the conductive rod at high speed, forming a pressing or solid-phase welding effect between the lower cover plate and the conductive rod, enabling the switch to close rapidly within 50μs.

[0018] Furthermore, the upper and lower cover plates are insulated by a ceramic shell with a parapet, thereby ensuring that it can withstand a voltage of 0-10kV for a long time without surface discharge.

[0019] Furthermore, a radial vacuum gap of 3-5mm is provided between the conductive rod and the lower cover plate to ensure that the long-term withstand voltage between the conductive rod and the lower cover plate is not less than 10kV, so that the fast switch can be applied to occasions with voltage of 10kV and below.

[0020] Furthermore, the lower cover plate has a concave structure, which serves as one pole of the fast switch on the one hand, and as a "flying piece" in the electromagnetic forming process on the other hand. During operation, the lower cover plate collides with the conductive rod at high speed under the action of electromagnetic repulsion, and a pressing or solid-phase welding effect is formed between the lower cover plate and the conductive rod, so that the switch closes quickly within 50μs.

[0021] Furthermore, when the size of the lower cover plate required for the fast switch design is small, using a magnet collector to confine the pulsed magnetic field to a smaller area can not only enhance the local magnetic field, but also protect the magnetic field coil and increase its service life.

[0022] Furthermore, by setting the gap between the magnet collector and the lower cover plate to 1-2 mm, the insulation strength between the magnet collector and the lower cover plate is ensured.

[0023] Furthermore, the electromagnetic forming coil adopts the form of a solenoid wound with flat copper wire and is reinforced with glass fiber on the outside; or it adopts the form of a Bitter coil, which can enhance the strength and service life of the coil.

[0024] Furthermore, if the current flow of a single switch cannot meet the current required for conduction, multiple switches can be connected in parallel. Since the electromagnetic forming device uses all electrical energy, the consistency of the lower cover plate forming can be ensured by controlling the charging voltage of the pulse capacitor bank to be consistent. Therefore, the consistency of the lower cover plate forming is very good, which can ensure the uniformity of the conduction time and current flow of each switch.

[0025] A method for using a fast-closing switch based on a vacuum gap employs the principle of electromagnetic forming. When a pulsed high current flows through the coil, the magnetic field of the electromagnetic forming coil directly acts on the lower cover plate at the bottom of the vacuum cavity, generating induced eddy currents. This causes the lower cover plate to collide with the conductive rod at high speed under the action of electromagnetic repulsion, forming a pressing or solid-phase welding effect between the lower cover plate and the conductive rod. This allows the switch to close rapidly within 50μs, greatly shortening the switch action time and solving the problem of excessively long action time of mechanical switches.

[0026] In summary, the operation time of this invention is much shorter than that of a mechanical switch, completing the operation within 50μs; the discharge energy is precisely controllable, the operation time is stable, and the dispersion is small, greatly shortening the switching operation time.

[0027] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0028] Figure 1 A schematic diagram of a fast-closing switch system based on a vacuum gap when using a magnet collector;

[0029] Figure 2 This is a schematic diagram showing the current direction in the forming coil, the magnet collector, and the lower cover plate.

[0030] Figure 3 A schematic diagram of a fast-closing switch system based on a vacuum gap when no magnet collector is used;

[0031] Figure 4A schematic diagram showing the current direction in the forming coil and the lower cover plate when the magnet collector is not used;

[0032] Figure 5 A schematic diagram of the system structure when multiple vacuum gap-based fast-closing switches are used in parallel;

[0033] Figure 6 This is a schematic diagram showing the connection between the lower cover plate and the conductive rod after magnetic forming.

[0034] The components are: 1. Input lead plate; 2. Top cover plate; 3. Ceramic shell; 4. Conductive rod; 5. Bottom cover plate; 6. Output lead plate; 7. Pulse capacitor bank; 8. Thyristor switch; 9. Magnetizer; 10. Electromagnetic forming coil; 11. Charger. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "one side," "one end," and "one side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0039] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0040] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0041] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0042] Please see Figure 1 The present invention provides a fast closing switch based on a vacuum gap, comprising an input guide plate 1, an upper cover plate 2, a ceramic shell 3, a conductive rod 4, a lower cover plate 5, an output guide plate 6, a pulse capacitor bank 7, a thyristor switch 8, a magnet collector 9, an electromagnetic forming coil 10, and a charger 11.

[0043] The fast-closing switch is a normally open switch, consisting of a vacuum chamber and an electromagnetic forming device. The vacuum chamber includes an upper cover plate 2, a ceramic shell 3, and a lower cover plate 5. The electromagnetic forming device includes a magnet collector 9. A conductive rod 4 is located inside the ceramic shell 3. The upper cover plate 2 is located at the top of the ceramic shell 3. The upper end of the conductive rod 4 is connected to the upper cover plate 2. A current-draining plate 1 is provided on one side of the upper cover plate 2. The lower cover plate 5 is located at the bottom of the ceramic shell 3. An output current-draining plate 6 is provided on one side of the lower cover plate 5. The magnet collector 9 is located on both sides of the lower cover plate 5. An electromagnetic forming coil 10 is provided outside the magnet collector 9. One end of the electromagnetic forming coil 10 is connected to the other end of the electromagnetic forming coil 10 and the grounding end in sequence via a thyristor switch 8 and a pulse capacitor bank 7. A charger 11 is connected in parallel across the two ends of the pulse capacitor bank 7. The vacuum chamber inside the fast-closing switch maintains a high vacuum environment, which can maintain the withstand voltage between the conductive rod 4 and the lower cover plate 5 at 0-10kV for a long time. The radial gap between the conductive rod 4 and the lower cover plate 5 is 3-5mm.

[0044] The lower cover plate 5 has a concave structure, which not only serves as the lower electrode connected to the output lead plate 6, but also functions as a flyer plate.

[0045] To ensure good conductivity, the input lead plate 1, the upper cover plate 2, the conductive rod 4, and the output lead plate 6 are made of copper or copper alloy. The lower cover plate 5 is generally made of annealed copper to ensure good plasticity.

[0046] The electromagnetic forming coil 10 used in the vacuum gap fast closing switch is either a solenoid made of flat copper wire or a Bitter coil. The size, number of turns, and inductance of the forming coil vary depending on the parameters of the lower cover plate 5. To ensure insulation, the gap between the magnet collector 9 and the lower cover plate 5 is 1 mm. An insulating film is wrapped around the lower cover plate 5 to ensure insulation between it and the magnet collector 9.

[0047] Please see Figure 3 and Figure 4 In a scenario where the magnet collector is not used, when the size of the lower cover plate 5 is large, to ensure that the inductance of the electromagnetic forming coil 10 and the frequency of the discharge current are within a certain range, the magnet collector 9 is removed. The magnetic field of the electromagnetic forming coil 10 directly acts on the induced eddy currents of the lower cover plate 5. As a result, the lower cover plate 5 collides with the conductive rod 4 at high speed under the action of electromagnetic repulsion, forming a pressing or solid-phase welding effect between the lower cover plate 5 and the conductive rod 4, causing the switch to close quickly. When the magnet collector is not used, the current direction in the electromagnetic forming coil 10 and the lower cover plate 5 is as follows: Figure 4 As shown.

[0048] The action time of the fast-closing switch based on the vacuum gap is controlled within 50μs, which is much shorter than the action time of traditional mechanical switches. Furthermore, the discharge energy of the pulse capacitor bank is precisely controllable, the action time is stable and has low dispersion, which greatly shortens the switch action time and solves the problem of excessively long action time of mechanical switches. By shortening the action time, the fault duration can be shortened, the damage of fault current to the load can be reduced, and the system stability can be significantly improved, which has significant technical and economic significance.

[0049] Please see Figure 2 This invention discloses a method for using a fast-closing switch based on a vacuum gap. A charger 11 is used to charge and maintain the voltage of a pulse capacitor bank 7. An electromagnetic forming coil 10 forms a discharge circuit through the pulse capacitor bank 7 and a thyristor switch 8. When the fast-closing switch receives an action signal, the thyristor switch 8 receives a trigger signal and turns on. The pulse capacitor bank 7 discharges to the electromagnetic forming coil 10, generating a large pulse current i1 in the coil and an induced current i2 in the magnet collector 9. This, in turn, generates an induced eddy current i3 in the lower cover plate 5. As a result, the lower cover plate 5 collides at high speed with the conductive rod 4 under the action of electromagnetic repulsion. A pressing or solid-phase welding effect is formed between the lower cover plate 5 and the conductive rod 4, thereby enabling the switch to close quickly.

[0050] The fast-closing switch system based on the vacuum gap ensures the consistency of the fast-closing switch action time by ensuring that the charging voltage of the external pulse capacitor bank 7 is consistent.

[0051] Please see Figure 5 In scenarios where multiple fast-closing switches are used in parallel, if the current carrying capacity of a single switch cannot meet the current required for conduction, multiple fast-closing switches can be connected in parallel. Since the electromagnetic forming of the lower cover plate 5 has excellent consistency, the uniformity of current carrying capacity of each switch can be guaranteed.

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0053] Example 1

[0054] The vacuum gap-based fast-closing switch is a normally open switch, consisting of a vacuum chamber and an electromagnetic forming device. The upper cover plate 2 has an input guide plate 1 connected to the conductive rod 4. The lower cover plate 5 has a concave structure, serving not only as the lower electrode connected to the output guide plate 6 but also as a flyback electrode. The upper cover plate 2 and the lower cover plate 5 are insulated from each other by a ceramic shell 3. The fast-closing switch maintains a high vacuum environment, ensuring a long-term withstand voltage of 0kV between the conductive rod 4 and the lower cover plate 5. The radial gap between the conductive rod 4 and the lower cover plate 5 is 3mm. To ensure good conductivity, the input guide plate 1, upper cover plate 2, conductive rod 4, and output guide plate 6 are made of copper or copper alloy. The lower cover plate 5, to ensure good plasticity, is generally made of annealed copper.

[0055] When the fast-closing switch receives an action signal, the thyristor switch 8 receives a trigger signal and turns on. The pulse capacitor bank 7 discharges to the electromagnetic shaping coil 10, generating a large pulse current i1 in the coil, inducing a current i2 in the magnet collector 9, and subsequently generating an induced eddy current i3 in the lower cover plate 5. See the reference for details. Figure 2 Under the influence of electromagnetic repulsion, the lower cover plate 5 collides at high speed with the conductive rod 4, forming a pressing or solid-phase welding effect between the lower cover plate 5 and the conductive rod 4, thus enabling the switch to close quickly. The action time of the vacuum gap-based fast-closing switch can be controlled within 50μs, which is much shorter than the action time of traditional mechanical switches. Furthermore, the discharge energy of the pulse capacitor bank is precisely controllable, the action time is stable, and the dispersion is small, greatly shortening the switch action time and solving the problem of excessively long mechanical switch action time.

[0056] Example 2

[0057] refer to Figure 3 In the case where the size of the lower cover plate 5 is large, in order to ensure that the inductance of the electromagnetic forming coil 10 and the frequency of the discharge current are within a certain range, the magnet collector 9 is removed, and the magnetic field of the electromagnetic forming coil 10 directly acts on the induced eddy current of the lower cover plate 5.

[0058] The vacuum gap-based fast-closing switch is a normally open switch, consisting of a vacuum chamber and an electromagnetic forming device. The upper cover plate 2 has an input guide plate 1 connected to the conductive rod 4. The lower cover plate 5 has a concave structure, serving not only as the lower electrode connected to the output guide plate 6 but also as a flyback electrode. The upper cover plate 2 and the lower cover plate 5 are insulated by a ceramic shell 3. The fast-closing switch maintains a high vacuum environment, ensuring a withstand voltage of 5kV between the conductive rod 4 and the lower cover plate 5 over a long period. The radial gap between the conductive rod 4 and the lower cover plate 5 is 4mm. To ensure good conductivity, the input guide plate 1, upper cover plate 2, conductive rod 4, and output guide plate 6 are made of copper or copper alloy. The lower cover plate 5, to ensure good plasticity, is generally made of annealed copper.

[0059] When the fast-closing switch receives an action signal, the thyristor switch 8 receives a trigger signal and turns on. The pulse capacitor bank 7 discharges to the electromagnetic shaping coil 10, generating a large pulse current i1 in the coil. Due to electromagnetic induction, an induced eddy current i2 is then generated in the lower cover plate 5. See reference for details. Figure 4 Under the influence of electromagnetic repulsion, the lower cover plate 5 collides at high speed with the conductive rod 4, forming a pressing or solid-phase welding effect between the lower cover plate 5 and the conductive rod 4, thus enabling the switch to close quickly. The action time of the vacuum gap-based fast-closing switch can be controlled within 50μs, which is much shorter than the action time of traditional mechanical switches. Furthermore, the discharge energy of the pulse capacitor bank is precisely controllable, the action time is stable, and the dispersion is small, greatly shortening the switch action time and solving the problem of excessively long mechanical switch action time.

[0060] Example 3

[0061] refer to Figure 5 In this system, if the current handling capacity of a single switch is insufficient to meet the current required for conduction, multiple switches can be connected in parallel. Multiple fast-closing switches based on vacuum gaps are connected in parallel. The upper cover plate 2 has an input guide plate 1 connected to the conductive rod 4. The lower cover plate 5 has a concave structure, serving not only as the lower electrode connected to the output guide plate 6 but also as a flyer. The upper cover plate 2 and the lower cover plate 5 are insulated from each other by a ceramic shell 3. The fast-closing switch maintains a high vacuum environment, ensuring a long-term withstand voltage of 10kV between the conductive rod 4 and the lower cover plate 5. The radial gap between the conductive rod 4 and the lower cover plate 5 is 5mm. To ensure good conductivity, the input guide plate 1, upper cover plate 2, conductive rod 4, and output guide plate 6 are made of copper or copper alloy. The lower cover plate 5, to ensure good plasticity, is made of annealed copper.

[0062] When the fast-closing switch receives an action signal, the thyristor switch 8 receives a trigger signal and turns on. The pulse capacitor bank 7 discharges to the electromagnetic shaping coil 10, generating a large pulse current i1 in the coil. Due to electromagnetic induction, an induced eddy current i2 is then generated in the lower cover plate 5. See reference for details. Figure 4 The lower cover plate 5 collidees with the conductive rod 4 at high speed under the action of electromagnetic repulsion, forming a pressing or solid-phase welding effect between the lower cover plate 5 and the conductive rod 4, thereby enabling multiple protective switches to close quickly. The action time of the fast-closing switch based on the vacuum gap can be controlled within 50μs, which is much shorter than the action time of traditional mechanical switches.

[0063] Since the electromagnetic forming device uses all electrical energy, the consistency of the forming of the lower cover plate 5 can be ensured by controlling the charging voltage of the pulse capacitor bank 7 to be consistent. Therefore, the consistency of the forming of the lower cover plate 5 is very good, which can ensure the uniformity of the conduction time and current of each switch.

[0064] In summary, the present invention provides a fast-closing switch based on a vacuum gap and its usage method, which has a much shorter operating time than mechanical switches, completing the operation within 50μs; the discharge energy is precisely controllable, the operating time is stable, and the dispersion is small, greatly shortening the switch operating time.

[0065] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A vacuum gap based fast closing switch, characterized in that, The application relates to a vacuum cavity, which is internally provided with a conductive rod (4) connected with the top of the vacuum cavity, and is provided with an electromagnetic forming coil (10) below the vacuum cavity, one end of the electromagnetic forming coil (10) being connected with the other end and the grounding end of the electromagnetic forming coil (10) through a thyristor switch (8) and a pulse capacitor group (7) in sequence, and a charging machine (11) being arranged in parallel at the two ends of the pulse capacitor group (7), wherein the vacuum cavity comprises a ceramic shell (3), the top of the ceramic shell (3) is provided with an upper cover plate (2), the bottom of the ceramic shell (3) is provided with a lower cover plate (5), one side of the upper cover plate (2) is provided with an input flow guide plate (1), one side of the lower cover plate (5) is provided with an output flow guide plate (6), the lower cover plate (5) is in a concave structure, and the upper end of the conductive rod (4) is connected with the upper cover plate (2).

2. The vacuum gap based fast closing switch of claim 1, wherein, The radial gap between the conductive rod (4) and the lower cover plate (5) is 3-5 mm.

3. The vacuum gap based fast closing switch of claim 1, wherein, The withstand voltage value between the conductive rod (4) and the lower cover plate (5) is 5-10 kV.

4. The vacuum gap based fast closing switch of claim 1, wherein, A magnetic collector (9) is arranged between the electromagnetic forming coil (10) and the lower cover plate (5).

5. The vacuum gap based fast closing switch of claim 4, wherein, The gap between the magnetic collector (9) and the lower cover plate (5) is 1-2 mm.

6. The vacuum gap based fast closing switch of claim 1, wherein, The electromagnetic forming coil (10) adopts a solenoid formed by winding flat copper wires or adopts a Bitter coil.

7. The vacuum gap based fast closing switch of claim 1, wherein, The quick closing switch comprises a plurality of quick closing switches connected in parallel, and the action time of each quick closing switch is less than or equal to 50 mu s.

8. A method of using a vacuum gap based fast closing switch according to any one of claims 1 to 7, characterized in that, The charging machine charges and maintains the voltage of the pulse capacitor group, the electromagnetic forming coil forms a discharge circuit through the pulse capacitor group and the thyristor switch, when the quick closing switch receives an action signal, the thyristor switch receives a trigger signal to be turned on, the pulse capacitor group discharges the electromagnetic forming coil, a pulse large current is generated in the electromagnetic forming coil, the magnetic field of the electromagnetic forming coil directly acts on the lower cover plate arranged at the bottom of the vacuum cavity to generate an induced eddy current, the lower cover plate is high-speed collided with the conductive rod under the action of the electromagnetic repulsive force, the pressing or solid-phase welding effect is formed between the lower cover plate and the conductive rod, and the quick closing switch is quickly closed.

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