A switch charging and ventilation structure and charging and ventilation method for a common cavity FLTD pulse source

Abstract

The present invention discloses a switch ventilation structure and ventilation method for a common cavity FLTD pulse source, wherein the parallel air pipes under the main branch and the parallel air pipes on the main branch are used to connect the circumferentially uniformly distributed through-pull rod air circuits in parallel, and the main branch switch air inlet pipe is led out from the corresponding position of the through-pull rod, and the high-voltage insulating gas is injected from the main branch air inlet controller, flows through the main branch air inlet pipe, enters the through-pull rod, and then enters each main branch switch through the main branch switch air inlet pipe; the high-voltage insulating gas is injected from the trigger branch controller, flows through the trigger branch air inlet pipe, enters the trigger branch cascade air pipe, and then enters each trigger branch switch through the branch air pipe, thereby realizing the ventilation of the common cavity FLTD switch. This design significantly reduces the number of main branch switch air circuit connectors, reduces the air resistance of the axial series inter-stage air circuit, makes the air pipe layout neat and standardized, improves the reliability of the switch air circuit and the switch gas ventilation quality, and ensures the consistency of the gas switch air pressure.

Description

Technical Field

[0001] The invention belongs to the technical field of pulse power, and relates to a switch charging and ventilation structure and a charging and ventilation method for a common cavity FLTD pulse source. Background Art

[0002] FLTD (Fast Linear Transformer) can directly output fast-front high-power pulses without pulse compression. It is recognized at home and abroad as the next generation of new driving source technology with the most promising development and application prospects. It has important application value in high-power Z pinch, flash photography and strong laser. Its typical topology is: fast discharge branches are connected in parallel to form a single-stage module of hundreds of GW level, dozens of modules are connected in series to form a single-stage TW level, and dozens of TW-level single-stages are connected in parallel to generate ultra-high power electric pulses of hundreds of TW level and tens of MA, driving different types of loads and generating a variety of extreme conditions.

[0003] The gas switch is a key component of the FLTD device to achieve energy conversion and transmission. The switch is closed and turned on precisely in a timely manner, allowing multiple modules to operate in series and parallel, thereby achieving efficient superposition of pulse voltage and current.

[0004] The main branch and trigger branch of the FLTD based on the axisymmetric evenly distributed separation column reflux common cavity and built-in synchronous triggering method both use high-power gas switches. The switch gas quality and good charging and ventilation are the basis and prerequisite for ensuring the reliable operation of large-scale FLTD devices. It is required that the FLTD drive source needs to complete the switch charging and discharging cycle every time it runs to ensure the reliability of the switch operation and synchronous discharge characteristics. Previously, the FLTD main branch and trigger branch switch charging and ventilation pipelines used PU gas pipes through 2-way, 3-way and other gas circuit connectors in series and parallel. The pipelines are complex, with many transfer links, high leakage rate and faults, large gas resistance in the gas circuit charging and ventilation, long ventilation time, insufficient gas replacement, and difficult gas pipe wiring in the high electromagnetic field interference environment of the FLTD primary enclosed. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of complex pipelines and insufficient charging and ventilation of fast linear transformers in the prior art, and to provide a switch charging and ventilation structure and a charging and ventilation method for a shared cavity FLTD pulse source.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention proposes a switch charging and ventilation structure for a common cavity FLTD pulse source, comprising a plurality of cascade pull rods, a plurality of through pull rods, parallel air pipes under the main branch and parallel air pipes on the main branch;

[0008] A plurality of cascade pull rods and a plurality of through pull rods are arranged at intervals to form a circular ring, wherein the parallel air pipe under the main branch is located at one end of the circular ring and is connected to the through pull rod; the parallel air pipe on the main branch is located at the other end of the circular ring and is connected to the through pull rod; a lower cover plate is installed on the lower bottom surface of the circular ring; three return plates are installed on the circular ring at equal intervals, and single-stage modules are installed on the upper surface of the return plate and the upper surface of the lower cover plate, and the single-stage module includes a trigger branch switch and a plurality of main branch switches; a main branch air intake controller and a trigger branch air intake controller are installed on the lower bottom surface of the lower cover plate. The output port of the main branch air intake controller passes through the lower cover plate and is connected to the main branch air intake pipe, and the other end of the main branch air intake pipe is connected to a pull rod; four main branch switch air intake pipes are installed in the axial direction of each pull rod, and one main branch switch air intake pipe is connected to a main branch switch; the output port of the trigger branch controller passes through the lower cover plate and is connected to the trigger branch air intake pipe, and the other end of the trigger branch air intake pipe is connected to the trigger branch cascade air pipe, and the trigger branch cascade air pipe is connected to four branch air pipes, and the branch air pipe is connected to the trigger branch switch.

[0009] Preferably, the main branch air intake controller includes a main branch air intake valve and a main branch air pressure gauge, the main branch air intake valve is connected to the main branch air intake pipe, and the main branch air pressure gauge is connected in parallel between the main branch air intake valve and the main branch air intake pipe.

[0010] Preferably, the trigger branch controller includes a trigger branch intake valve and a trigger branch air pressure gauge, the trigger branch intake valve is connected to the trigger branch intake pipe, and the trigger branch air pressure gauge is connected in parallel between the trigger branch intake valve and the trigger branch intake pipe.

[0011] Preferably, a lower insulating plate is provided between the trigger branch switch and the main branch switch, and between adjacent main branch switches.

[0012] Preferably, the cascade tie rods and the through tie rods are arranged at equal intervals; and the number of the cascade tie rods and the through tie rods is equal.

[0013] Preferably, the four main branch switch air inlet pipes are arranged at equal intervals.

[0014] Preferably, the trigger branch cascade air pipe is installed in the axial direction of any one of the through pull rods or the cascade pull rods.

[0015] Preferably, an upper cover plate is installed on the upper top surface of the ring.

[0016] Preferably, the main branch air inlet pipe, the lower parallel air pipe of the main branch, the upper parallel air pipe of the main branch, and the main branch switch air inlet pipe are all connected to the pull rod by a quick-tighten gas joint.

[0017] The present invention proposes a method for charging and exchanging air in a switch charging and exchanging air structure for a common cavity FLTD pulse source, comprising the following steps:

[0018] The pull rod is connected in parallel with the parallel air pipes under the main branch and the parallel air pipes on the main branch to form the main air supply channel of the main branch switch; the high-voltage insulating gas is injected from the main branch air intake controller, flows through the main branch air intake pipe, enters the pull rod, and then enters each main branch switch through the main branch switch air intake pipe; the high-voltage insulating gas is injected from the trigger branch controller, flows through the trigger branch air intake pipe, enters the trigger branch cascade air pipe, and then enters each trigger branch switch through the branch air pipe, thereby realizing the charging and ventilation of the common cavity FLTD switch.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention proposes a switch charging and ventilation structure for a common cavity FLTD pulse source, in which the pull rod in the reflux rod of the multi-stage series module separation column in the common cavity is changed into a hollow tube, and both ends are closed, and the circumferentially evenly distributed pull rod air paths are connected in parallel with the parallel air pipes under the main branch and the parallel air pipes on the main branch, and the main branch switch air inlet pipe is led out from the corresponding position of the pull rod, and the high-voltage insulating gas is injected from the main branch air inlet controller, flows through the main branch air inlet pipe, enters the pull rod, and then enters each main branch switch through the main branch switch air inlet pipe; the high-voltage insulating gas is injected from the trigger branch controller, flows through the trigger branch air inlet pipe, enters the trigger branch cascade air pipe, and then enters each trigger branch switch through the branch air pipe, thereby realizing the charging and ventilation of the common cavity FLTD switch. This design significantly reduces the number of main branch switch gas circuit connectors, reduces the axial inter-stage gas circuit air resistance, makes the gas pipe layout more neat and standardized, improves the reliability of the switch gas circuit and the switch gas ventilation quality, ensures the consistency of the gas switch gas pressure, and is conducive to the stable operation of large FLTD charging devices. Therefore, the switch charging and ventilation structure proposed in the present invention has good application prospects in the field of pulse power technology.

[0021] Furthermore, insulating plates are provided between the trigger branch switch and the main branch switch, and between adjacent main branch switches, so as to achieve the purpose of mutual insulation between devices.

[0022] Furthermore, the combination of the air intake valve and the air pressure gauge enables online monitoring of the charging and ventilation air pressure, reducing the number of openings in the floor under the common cavity.

[0023] Furthermore, the cascade pull rods and the through pull rods are spaced at equal intervals, so that the air resistance of each switch charging and ventilation circuit is equal, so that the charging and ventilation are more synchronized. The cascade pull rods and the through pull rods are arranged at intervals, which not only realizes the synchronous charging and ventilation of large-scale switches, but also ensures the assembly relationship of the shared cavity structure.

[0024] Furthermore, the air inlet pipes of the four main branch switches are arranged at equal intervals to ensure that the air resistance of the air path is minimized.

[0025] Furthermore, compared with the quick-insert connector in the prior art, the quick-twist connector can be used in a narrow space, and the leakage rate of the inflation system is small.

[0026] The present invention proposes a method for charging and ventilating a switch charging and ventilating structure for a common cavity FLTD pulse source, which first forms a main gas supply channel for a main branch switch, and then injects high-voltage insulating gas into a main branch air intake controller and a trigger branch controller respectively; injects high-voltage insulating gas from the main branch air intake controller, flows through the main branch air intake pipe, a pull rod, and a main branch switch air intake pipe in sequence, thereby entering each main branch switch; injects high-voltage insulating gas from the trigger branch controller, flows through the trigger branch air intake pipe, the trigger branch cascade air pipe, and the branch air pipe in sequence, and enters each trigger branch switch, thereby realizing charging and ventilating of the common cavity FLTD switch, with a simple operation method and reliable charging and ventilating. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is an overall schematic diagram of the common cavity gas path of the present invention.

[0029] Figure 2 It is a schematic diagram of the common cavity gas path of the present invention.

[0030] Among them: 1-first single-stage module, 2-second single-stage module, 3-third single-stage module, 4-fourth single-stage module, 51-trigger branch switch, 52-main branch switch, 61-lower cover plate, 62-upper cover plate, 63-cascade pull rod, 64-lower insulation plate, 65-return plate, 71-main branch air intake valve, 72-main branch air pressure gauge, 73-main branch air intake pipe, 74-through pull rod, 75-main branch switch air intake pipe, 76-main branch lower parallel air pipe, 77-main branch upper parallel air pipe, 81-trigger branch air intake valve, 82-trigger branch air pressure gauge, 83-trigger branch air intake pipe, 84-branch air pipe, 85-trigger branch cascade air pipe. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0038] The present invention proposes a switch charging and ventilation structure for a common cavity FLTD pulse source, such as Figure 1 As shown, it is a typical four-stage common cavity FLTD module, a plurality of cascade tie rods 63 and a plurality of through tie rods 74 are arranged at intervals to form a ring, the cascade tie rods 63 and the through tie rods 74 are arranged at equal intervals, and the number of cascade tie rods 63 and the through tie rods 74 is equal. The main branch lower parallel air pipe 76 is located at one end of the ring and is connected to the through tie rod 74; the main branch parallel air pipe 77 is located at the other end of the ring and is connected to the through tie rod 74; the upper top surface of the ring is installed with an upper cover plate 62, and the lower bottom surface of the ring is installed with a lower cover plate 61; three return plates 65 are installed at equal intervals on the ring, and the upper surface of the return plate 65 and the upper surface of the lower cover plate 61 are both installed with single-stage modules, and the single-stage module includes a trigger branch switch 51 and a plurality of main branch switches 52; lower insulating plates 64 are provided between the trigger branch switch 51 and the main branch switch 52, and between adjacent main branch switches 52. The lower bottom surface of the lower cover plate 61 is installed with a main branch air intake controller and a trigger branch air intake controller. The output port of the main branch air intake controller passes through the lower cover plate 61 and is connected to a main branch air intake pipe 73. The other end of the main branch air intake pipe 73 is connected to a pull rod 74. Four main branch switch air intake pipes 75 are connected and installed in the axial direction of each pull rod 74. One main branch switch air intake pipe 75 is connected to one main branch switch 52. The installation position of the main branch switch air intake pipe 75 is determined according to the air intake position of the main branch switch 52. The four main branch switch air intake pipes 75 are arranged at equal intervals. The output port of the trigger branch controller passes through the lower cover plate 61 and is connected to a trigger branch air intake pipe 83. The other end of the trigger branch air intake pipe 83 is connected to a trigger branch cascade air pipe 85. The trigger branch cascade air pipe 85 is connected to four branch air pipes 84, and the branch air pipe 84 is connected to the trigger branch switch 51. The trigger branch cascade air pipe 84 is installed in the axial direction of any one of the through pull rods 74 or the cascade pull rods 63 .

[0039] The main branch air intake controller includes a main branch air intake valve 71 and a main branch air pressure gauge 72. The main branch air intake valve 71 is connected to the main branch air intake pipe 73. The main branch air pressure gauge 72 is connected in parallel between the main branch air intake valve 71 and the main branch air intake pipe 73. The trigger branch controller includes a trigger branch air intake valve 81 and a trigger branch air pressure gauge 82. The trigger branch air intake valve 81 is connected to the trigger branch air intake pipe 83. The trigger branch air pressure gauge 82 is connected in parallel between the trigger branch air intake valve 81 and the trigger branch air intake pipe 83.

[0040] The single-stage module includes a first single-stage module 1, a second single-stage module 2, a third single-stage module and a fourth single-stage module 4, and the four single-stage modules form a structural frame through a lower cover plate 61, an upper cover plate 62, a cascade pull rod 63, and a through pull rod 74. Any one of the first single-stage module 1, the second single-stage module 2, the third single-stage module and the fourth single-stage module 4 includes a trigger branch switch 51 connected in parallel with a plurality of main branch switches 52, which are densely arranged in an equal-gap circular array.

[0041] Between the first single-stage module 1 , the second single-stage module 2 , the third single-stage module and the fourth single-stage module 4 , different modules are axially connected in series, separated by a return plate 65 , and have the same structure. Figure 1 In the four-stage common cavity FLTD module shown, there are a total of four trigger branch switches 51 and a plurality of main branch switches 52 that need to be inflated and deflated simultaneously.

[0042] The present invention utilizes the through-pull rod 74 to connect the inter-stage gas paths of different main branch switches 52. The through-pull rod 74 and the cascade pull rod 63 are arranged in a circular array with an equal number.

[0043] In the first single-stage module 1, the second single-stage module 2, the third single-stage module 3 or the fourth single-stage module 4, the total number of the through pull rods 74 and the cascade pull rods 63 is equal to the total number of the main branch switches 52 and the trigger switches 51, and the through pull rods 74 and the cascade pull rods 63 are distributed in a circular array between the main branch switches 52 or the trigger branch switches 51.

[0044] Figure 2 In the charging and ventilation circuit shown, there are 12 through-pull rods 74 and cascade pull rods 63, and the through-pull rods 74 of the cascade charging circuit are connected to the 23 main branch switches 52 of each stage.

[0045] The main branch air inlet pipe 73, the main branch lower parallel air pipe 76, the main branch upper parallel air pipe 77, and the switch air inlet pipe 75 are all connected to the pull rod 74 by quick-tightening gas joints.

[0046] Four pairs of switch air inlet pipes 75 are symmetrically distributed on each pull rod 74. The axial distribution position of the switch air inlet pipes 75 on the pull rod 74 corresponds to the air inlet of the main branch switch 52. The shortest length of the switch air inlet pipes 75 is optimal.

[0047] The present invention proposes a method for charging and exchanging air in a switch charging and exchanging air structure for a common cavity FLTD pulse source, comprising the following steps:

[0048] The pull rod 74 is connected in parallel with the parallel air pipe 76 under the main branch and the parallel air pipe 77 on the main branch to form the main air supply channel of the main branch switch 52; the high-voltage insulating gas is injected from the main branch air inlet controller, flows through the main branch air inlet pipe 73, enters the pull rod 74, and then enters each main branch switch 52 through the main branch switch air inlet pipe 75; the high-voltage insulating gas is injected from the trigger branch controller, flows through the trigger branch air inlet pipe 83, enters the trigger branch cascade air pipe 85, and then enters each trigger branch switch 51 through the branch air pipe 84, thereby realizing the charging and ventilation of the common cavity FLTD switch structure.

[0049] The specific working process and working principle are as follows:

[0050] The 12 pull rods 74 are connected in parallel through the parallel air pipes 76 under the main branch and the parallel air pipes 77 on the main branch to form the main air supply channel of the main branch switch 52, and the branch air pipe 84 is not connected to the pull rods 74.

[0051] High-voltage insulating gas is injected from the main branch air inlet valve 71, flows through the main branch air inlet pipe 73, enters the pull rod 74, and then enters each main branch switch 52 through the main branch switch air inlet pipe 75. The main branch air pressure gauge 72 is connected in parallel between the main branch air inlet valve 71 and the main branch air inlet pipe 73, and is on the same side of the lower cover plate 61 as the main branch air inlet valve 71.

[0052] High-voltage insulating gas is injected from the trigger branch air inlet valve 81, flows through the trigger branch air inlet pipe 83, and enters the branch air pipe 84; the output port of the branch air pipe is connected to the trigger branch cascade air pipe 85, and four branch air pipes 84 are installed on the trigger branch cascade air pipe 85 at equal intervals, and the trigger branch cascade air pipe 85 is connected to the branch air pipe 84, and the branch air pipe 84 enters the trigger branch switch 51 of each single-stage module. Among them, the trigger branch air pressure gauge 82 is connected in parallel between the trigger branch air inlet valve 81 and the trigger branch air inlet pipe 83, and is on the same side of the lower cover plate 61 as the trigger branch air inlet valve 81.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A switch charging and ventilation structure for a common cavity FLTD pulse source, characterized in that: It comprises a plurality of cascade pull rods (63), a plurality of through pull rods (74), parallel air pipes (76) under the main branch and parallel air pipes (77) on the main branch; A plurality of cascade pull rods (63) and a plurality of through pull rods (74) are arranged at intervals to form a circular ring; the main branch lower parallel air pipe (76) is located at one end of the circular ring and is communicated with the through pull rod (74); the main branch upper parallel air pipe (77) is located at the other end of the circular ring and is communicated with the through pull rod (74); a lower cover plate (61) is installed on the lower bottom surface of the circular ring; three return plates (65) are installed on the circular ring at equal intervals; the upper surface of the return plate (65) and the upper surface of the lower cover plate (61) are both installed with single-stage modules, and the single-stage modules include a trigger branch switch (51) and a plurality of main branch switches (52); a main branch air intake controller and a trigger branch air intake controller are installed on the lower bottom surface of the lower cover plate (61); The output port of the air intake controller passes through the lower cover plate (61) and is connected to a main branch air intake pipe (73), and the other end of the main branch air intake pipe (73) is connected to a pull rod (74); four main branch switch air intake pipes (75) are connected and installed in the axial direction of each pull rod (74), and one main branch switch air intake pipe (75) is connected to one main branch switch (52); the output port of the trigger branch controller passes through the lower cover plate (61) and is connected to a trigger branch air intake pipe (83), and the other end of the trigger branch air intake pipe (83) is connected to a trigger branch cascade air pipe (85), and the trigger branch cascade air pipe (85) is connected to four branch air pipes (84), and the branch air pipe (84) is connected to the trigger branch switch (51).

2. The switch charging and ventilation structure for a common cavity FLTD pulse source according to claim 1, characterized in that: The main branch air intake controller comprises a main branch air intake valve (71) and a main branch air pressure gauge (72); the main branch air intake valve (71) is connected to the main branch air intake pipe (73); and the main branch air pressure gauge (72) is connected in parallel between the main branch air intake valve (71) and the main branch air intake pipe (73).

3. The switch charging and ventilation structure for a common cavity FLTD pulse source according to claim 1, characterized in that: The trigger branch controller comprises a trigger branch air intake valve (81) and a trigger branch air pressure gauge (82); the trigger branch air intake valve (81) is in communication with the trigger branch air intake pipe (83); and the trigger branch air pressure gauge (82) is connected in parallel between the trigger branch air intake valve (81) and the trigger branch air intake pipe (83).

4. The switch charging and ventilation structure for a common cavity FLTD pulse source according to claim 1, characterized in that: A lower insulating plate (64) is provided between the trigger branch switch (51) and the main branch switch (52), and between adjacent main branch switches (52).

5. The switch charging and ventilation structure for a common cavity FLTD pulse source according to claim 1, characterized in that: The cascade pull rods (63) and the through pull rods (74) are arranged at equal intervals; the number of the cascade pull rods (63) and the through pull rods (74) is equal.

6. The switch charging and ventilation structure for a common cavity FLTD pulse source according to claim 1, characterized in that: The four main branch switch air inlet pipes (75) are arranged at equal intervals.

7. The switch charging and ventilation structure for a common cavity FLTD pulse source according to claim 1, characterized in that: The trigger branch cascade air pipe (84) is installed in the axial direction of any one of the through pull rods (74) or the cascade pull rods (63).

8. The switch charging and ventilation structure for a common cavity FLTD pulse source according to claim 1, characterized in that: An upper cover plate (62) is installed on the upper top surface of the circular ring.

9. The switch charging and ventilation structure for a common cavity FLTD pulse source according to claim 1, characterized in that: The main branch air inlet pipe (73), the main branch lower parallel air pipe (76), the main branch upper parallel air pipe (77), and the main branch switch air inlet pipe (75) are all connected to the pull rod (74) in the form of quick-tightening gas joints.

10. A method for charging and exchanging air using a switch charging and exchanging air structure for a common cavity FLTD pulse source according to any one of claims 1 to 9, characterized in that: The steps include: The pull rod (74) is connected in parallel with the parallel air pipe (76) under the main branch and the parallel air pipe (77) on the main branch to form the main air supply channel of the main branch switch (52); the high-voltage insulating gas is injected from the main branch air inlet controller, flows through the main branch air inlet pipe (73), enters the pull rod (74), and then enters each main branch switch (52) through the main branch switch air inlet pipe (75); the high-voltage insulating gas is injected from the trigger branch controller, flows through the trigger branch air inlet pipe (83), enters the trigger branch cascade air pipe (85), and then enters each trigger branch switch (51) through the branch air pipe (84), thereby realizing the charging and ventilation of the common cavity FLTD switch.

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