An automatic charging device for a two-stage light gas gun

Abstract

This invention relates to the field of hydrogen filling technology, specifically an automatic filling device for a two-stage light gas cannon. The invention mainly comprises three parts: a gas cylinder cabinet, a gas injection cabinet, and an electrical control system. It enables automatic hydrogen filling and discharge from the two-stage cannon pump pipe. Remote control of hydrogen filling allows for the separation of personnel from hazardous sources during the filling process, eliminating safety hazards. While ensuring safe and leak-free hydrogen filling, it strictly controls the filling pressure and flow rate, ensuring a stable and controllable filling process to improve work efficiency. The filling device has only one working port for easy connection to the gas injection cabinet. There are no strict requirements on the distance between the gas cylinder cabinet, gas injection cabinet, and pump pipe, allowing for long-distance energy transmission. Installation does not require modifications to existing factory buildings, reducing the spatial complexity of equipment layout and facilitating flexible installation.

Description

Technical Field

[0001] This invention relates to the field of hydrogen filling technology, specifically an automatic filling device for a two-stage light gas cannon. Background Technology

[0002] In routine scientific research and production, a two-stage light gas cannon is used as a loading device to conduct experiments on the high-pressure characteristic parameters of materials. The two-stage light gas cannon is a hypersonic launch experimental device, its core being the use of hydrogen as the secondary propellant to achieve projectile velocities of 1–10 km / s, far exceeding those of conventional artillery. The pump tube is a component on the two-stage light gas cannon used for pre-filling with hydrogen. Before each experiment, hydrogen must be filled into the pump tube from a standard gas cylinder, and the pressure must meet specified requirements. Since the hydrogen used in the experiments is a flammable gas, if it mixes with air inside the pump tube, an explosion can easily occur. Therefore, the pump tube must be pre-treated before filling with hydrogen to ensure the purity of the hydrogen inside.

[0003] A Chinese invention patent with patent number CN111156505B, entitled "Hydrogen Refueling Equipment," discloses a refueling equipment inlet, an outlet, a vacuum pump, an oxygen removal device, a nitrogen storage device, a nitrogen removal device, and a hydrogen storage device. The refueling equipment inlet is connected to the vacuum pump inlet, the vacuum pump outlet is selectively connected to either the oxygen removal device inlet or the nitrogen removal device inlet, the oxygen removal device outlet is connected to the nitrogen storage device's recovery port, the nitrogen removal device outlet is connected to the hydrogen storage device's recovery port, and the nitrogen storage device outlet and the hydrogen storage device outlet are selectively connected to the refueling equipment outlet. However, this technology leaves residual gas from the previous refueling process in the pipe connecting the refueling equipment outlet to the vehicle's hydrogen storage tank inlet. If hydrogen is refueled directly after purging, the hydrogen and residual gas mix and enter the vehicle's hydrogen storage tank, increasing the number of refueling-purging operations and further extending the refueling time.

[0004] In existing technologies, at least two or more working ports are set on the device to be filled to achieve gas outlet or gas inlet. During installation, the pipes on the filling device need to be connected to the corresponding working ports one by one, which increases the time required for each installation of the filling device. Moreover, the gas injection accuracy is controlled by visual observation of mechanical gauges, and personnel are always in close contact with hydrogen, making it impossible to isolate personnel from the safe distance of hazardous materials. This results in low filling efficiency by shortening the hydrogen filling time while ensuring the purity of the hydrogen. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic charging device for a two-stage light gas gun to solve the problems mentioned in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automatic charging device for a two-stage light gas gun, the device comprising: Gas cylinder cabinets are used to store and supply gases, including nitrogen and hydrogen. The gas injection cabinet includes two piping components on it, the inlet of which is connected to the gas outlet of the gas cylinder cabinet, and the outlet of which is connected to the working port of the pump pipe. The vacuum pump, whose inlet is connected to the corresponding branch of pipe fitting two, is used to pump out the gas in pipe fitting two and its corresponding branch, as well as the gas in the pump pipe; after a vacuum environment is formed, the gas cylinder cabinet delivers hydrogen to the pump pipe through the sealed pipe fitting two. The vent pipe has its inlet connected to the corresponding branch of the second pipe component. After the hydrogen injection is completed, nitrogen enters the second pipe component, and the nitrogen carries the residual hydrogen in the second pipe component out of the vent pipe to the outside of the laboratory gun room wall. Several opening and closing components are provided, respectively located on the gas cylinder cabinet, the second pipe component, and the corresponding branches of the second pipe component, for controlling the gas flow path.

[0007] Furthermore, the gas cylinder cabinet includes a hydrogen cylinder, a nitrogen cylinder, and a pipe fitting 1. The pipe fitting 1 includes pipe 1, pipe 2, and pipe 3. The outlet of the nitrogen cylinder is connected to the inlet of pipe 1, the outlet of the hydrogen cylinder is connected to the inlet of pipe 2, and the outlets of pipe 1 and pipe 2 are both connected to pipe 3. Pipe 3 extends to the outside of the cabinet and is used to connect to the inlet of pipe fitting 2. The opening and closing component includes a first solenoid valve installed on the first pipe and a second solenoid valve installed on the second pipe near one end of the second pipe.

[0008] Furthermore, the second pipe component includes a main pipe, the inlet of which is connected to the outlet of the third pipe, and the outlet of which is connected to the inlet of the pump operating pipe. The opening and closing mechanism also includes a fourth solenoid valve and a third solenoid valve; The main pipeline is sequentially equipped with a first probe for measuring the initial pressure of the hydrogen cylinder, a first-stage pressure reducing device, a second-stage pressure reducing device, a second probe for measuring the pressure of the hydrogen cylinder after pressure reduction, a fourth solenoid valve, a third probe for measuring the injection pressure, and the third solenoid valve along its hydrogen injection direction.

[0009] Furthermore, the device also includes an exhaust pipe, the outlet of which is connected to the inlet of the vacuum pump, and a seventh solenoid valve is provided on the exhaust pipe; A first three-way pipe is provided on the main pipeline between the third probe and the third solenoid valve, and the cavity of the main pipeline, the inlet of the exhaust pipe and the inlet of the vent pipe are respectively connected to the corresponding interfaces of the first three-way pipe; The opening and closing mechanism also includes a sixth solenoid valve installed on the drain pipe.

[0010] Furthermore, a branch pipe is provided on the main pipeline between the second probe and the fourth solenoid valve. A fifth solenoid valve and a calibration valve are provided on the branch pipe. By pre-setting the opening size of the calibration valve, the amount of hydrogen injected per unit time is controlled in the later stage of hydrogen injection.

[0011] Furthermore, the device also includes a second branch pipe, the outlet of which is connected to the main pipe near the outlet, and a third hand valve is installed on it; A second tee pipe is provided between the corresponding second probe and the fourth solenoid valve on the main pipeline. The cavity of the main pipeline, the inlet of the first branch pipe, and the inlet of the second branch pipe are respectively connected to the corresponding interfaces of the second tee pipe.

[0012] Furthermore, the device also includes a third branch pipe, on which a fifth hand valve is provided; A third three-way pipe is provided between the corresponding first three-way pipe and the seventh solenoid valve on the exhaust pipe. The inlet of the third branch pipe, the cavity of the exhaust pipe and the outlet of the first branch pipe are respectively connected to the corresponding interface of the third three-way pipe. A sixth hand valve is installed at the working port of the pump pipe.

[0013] Furthermore, the gas injection cabinet is equipped with a hydrogen detection probe for detecting the hydrogen concentration inside the gas injection cabinet.

[0014] Furthermore, the top of the gas cylinder cabinet is equipped with a vent pipe, and the inside is equipped with a second hydrogen detection probe. The vent outlet is located outside the wall of the laboratory's gun room and is used to discharge the hydrogen leaking from the gas cylinder cabinet to the outside.

[0015] Furthermore, a first manual valve and a pressure gauge are provided on the first pipeline near the nitrogen cylinder, and a second manual valve and a pressure gauge are provided on the second pipeline near the hydrogen cylinder.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention mainly comprises three parts: a gas cylinder cabinet, a gas injection cabinet, and an electrical control system. It enables automatic hydrogen filling and discharge from the secondary light gas cannon pump pipe. Through remote control of hydrogen filling, personnel and hazardous sources are separated during the hydrogen injection process to eliminate safety hazards. While ensuring safe and leak-free filling, it reduces the number of gas filling operations, strictly controls the filling pressure and flow rate, and ensures the entire filling process is stable and controllable to improve work efficiency. The filling device has only one working port for easy connection to the gas injection cabinet. There are no strict requirements on the distance between the gas cylinder cabinet, the gas injection cabinet, and the pump pipe, allowing for long-distance energy transmission. No modifications to the existing plant interior are required during installation, reducing the spatial complexity of equipment layout and facilitating flexible installation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the environment in which the present invention is used, according to one embodiment. Figure 2 This is a schematic diagram of the overall structure in one embodiment of the present invention; Figure 3 This is a schematic diagram of the gas injection tank in one embodiment of the present invention; In the picture: 1. Gas cylinder cabinet; 2. Gas filling cabinet; 3. Pump pipe; 4. Vacuum pump; 5. Vent pipe; 6. Hydrogen cylinder; 7. Nitrogen cylinder; 8. Pipeline 1; 9. Pipeline 2; 10. Pipeline 3; 11. Main pipeline; 12. Exhaust pipe; 13. Calibration valve; 14. Vent pipe; 15. Primary pressure reducing device; 16. Secondary pressure reducing device; 21. First solenoid valve; 22. Second solenoid valve; 23. Third solenoid valve; 24. Fourth solenoid valve; 25. Fifth solenoid valve; 26. Sixth solenoid valve; 27. Seventh solenoid valve; 31. First probe; 32. Second probe; 33. Third probe; 41. First tee pipe; 42. Second tee pipe; 43. Third tee pipe; 51. Branch pipe one; 52. Branch pipe two; 53. Branch pipe three; 61. First hand valve; 62. Second hand valve; 63. Third hand valve; 65. Fifth hand valve; 66. Sixth hand valve. Detailed Implementation

[0018] 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 embodiments of the present invention, and not all embodiments. 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.

[0019] See Figures 1-3 The present invention provides a technical solution: an automatic charging device for a two-stage light gas gun, comprising: Gas cylinder cabinet 1, used for storing and supplying gases, including nitrogen and hydrogen; Gas injection cabinet 2, including pipe fitting 2 thereon, its inlet is connected to the gas outlet of gas cylinder cabinet 1, and its outlet is connected to the working port of pump pipe 3. Vacuum pump 4, whose inlet is connected to the corresponding branch of pipe fitting 2, is used to pump out the gas in pipe fitting 2 and its corresponding branch, as well as the gas in pump pipe 3; after a vacuum environment is formed, gas cylinder cabinet 1 delivers hydrogen to pump pipe 3 through sealed pipe fitting 2. The vent pipe 5 has its inlet connected to the corresponding branch of the pipe component 2. After the hydrogen injection is completed, nitrogen enters the pipe component 2. The nitrogen carries the hydrogen remaining in the pipe component 2 and is discharged from the vent pipe 5 to the outside of the laboratory gun room wall, and then discharged into the external wastewater and waste gas system. Several opening and closing components are provided, respectively located on the gas cylinder cabinet 1, the pipe component 2 and the corresponding branch of the pipe component 2, for controlling the gas flow path.

[0020] It should be noted that: Gas cylinder cabinet 1 is an explosion-proof gas cylinder cabinet. Gas cylinder cabinet 1 is equipped with nitrogen cylinder 7, hydrogen cylinder 6, piping fittings 1 and an alarm. Hydrogen cylinder 6 is placed in the cabinet only when gas needs to be filled. When not in use, hydrogen cylinder 6 is taken out and stored separately. It is used for storing gas cylinders, leak monitoring and switch control. Gas injection cabinet 2 includes components such as piping, pressure sensor, pressure reducing valve, manual valve, solenoid valve, and alarm, used for emission and leak detection; The device is connected to an electronic control system, which includes a solenoid valve control module, a data acquisition system, and a data analysis system, for remote operation and data acquisition.

[0021] Only one independent working pipe is installed on pump pipe 3, and a sixth hand valve 66 is installed on the working pipe.

[0022] The working procedure is as follows: First, a vacuum is drawn. The internal pipes and pump pipes of the gas injection cabinet are evacuated to below 100 Pa before hydrogen injection can begin. After hydrogen injection, the hydrogen inside the gas injection cabinet pipes is released, and the experiment is awaited to launch. The internal pipes of the gas injection cabinet refer to pipe fitting two and its corresponding branches.

[0023] In one embodiment, pipe component one includes pipe one 8, pipe two 9, and pipe three 10. The outlet ends of pipe one 8 and pipe two 9 are both connected to pipe three 10, which extends to the outside of the cabinet for connection to the air inlet of pipe component two. The outlet of nitrogen cylinder 7 is connected to the inlet of pipe one 8, and the outlet of hydrogen cylinder 6 is connected to the inlet of pipe two 9. A first solenoid valve 21 is provided on pipe one 8, and a second solenoid valve 22 is provided on pipe two 9 near one end. A first manual valve 61 is provided on pipe one 8 near the inlet, and a second manual valve 62 is provided on pipe two 9 near the inlet.

[0024] Pipeline component two includes a main pipeline 11, the inlet of the main pipeline 11 is connected to the outlet of pipeline three 10, the outlet of the main pipeline 11 is connected to the inlet of the working pipe on the pump pipe 3, and the main pipeline 11 is sequentially equipped with a first probe 31, a first-stage pressure reducing device 15, a second-stage pressure reducing device 16, a second probe 32, a fourth solenoid valve 24, a third probe 33 and a third solenoid valve 23. A first tee pipe 41 is provided between the corresponding third probe 33 and the third solenoid valve 23 on the main pipe 11 for connecting a branch on the main pipe 11. One end of the first tee pipe 41 is connected to the main pipe 11, and the other two ends are connected to the inlet of the exhaust pipe 12 and the vent pipe 5, respectively. The exhaust pipe 12 is equipped with a seventh solenoid valve 27, and the outlet of the exhaust pipe 12 is connected to a vacuum pump 4, which is used to open or disconnect the connection between the exhaust pipe 12 and the vacuum pump 4 by the seventh solenoid valve 27. A sixth solenoid valve 26 is installed on the vent pipe 5, and the outlet of the vent pipe 5 is located outside the wall of the laboratory gun room. By adjusting the opening and closing of the corresponding solenoid valve, residual hydrogen gas in the corresponding pipes and pump pipe 3 is extracted, ensuring safe and leak-free filling while reducing the number of gas filling times.

[0025] This device mainly consists of three parts: a gas cylinder cabinet 1, a gas injection cabinet 2, and an electrical control system. It can realize the automatic filling and discharge of hydrogen in the secondary cannon pump pipe 3. By remotely controlling the hydrogen filling, personnel can be separated from the hazardous source during the hydrogen injection process to eliminate safety hazards and improve work efficiency.

[0026] A second tee pipe 42 is provided between the corresponding second probe 32 and the fourth solenoid valve 24 on the main pipe 11 for connecting a branch on the main pipe 11. One end of the second tee pipe 42 is connected to the main pipe 11, and the other two ends are connected to the inlets of branch pipe 1 51 and branch pipe 2 52 respectively. A third three-way pipe 43 is provided between the first three-way pipe 41 and the seventh solenoid valve 27 on the exhaust pipe 12. It is used to connect a branch on the exhaust pipe 12. One end of the third three-way pipe 43 is connected to the exhaust pipe 12, and the other two ends are connected to the outlet of the first branch pipe 51 and the inlet of the third branch pipe 53, respectively.

[0027] A fifth solenoid valve 25 and a calibration valve 13 are installed on the branch pipe 51. The fifth solenoid valve 25 is used to fine-tune the amount of hydrogen injected per unit time in the later stage of hydrogen injection to achieve precise hydrogen injection. The calibration valve 13 is used to manually fill the solenoid valve in case it fails.

[0028] A fifth hand valve 65 is installed on branch pipe 3 53. The outlet of branch pipe 3 53 is connected to the drain pipe 5 and is located between the sixth solenoid valve 26 and the outlet of drain pipe 5. It is used to cooperate with other solenoid valves to achieve the sealing and opening of pipe fitting 1 and pipe fitting 2. A third hand valve 63 is installed on branch pipe 2 52. It is a backup valve and is normally closed to prevent damage to the third solenoid valve 23. It is used to connect manual air injection at critical moments. Through remote control of the solenoid valve and on-site control of the hand valve, the safety of equipment use is improved.

[0029] In one embodiment, a hydrogen detection probe 17 is installed inside the gas injection cabinet 2 and connected to a hydrogen concentration alarm system to detect whether there is a hydrogen leak inside the gas injection cabinet 2. If an accidental hydrogen leak occurs, personnel will receive a hydrogen alarm signal and immediately press the emergency stop button on the remote control terminal to close all solenoid valves, ensuring that the gas supply stops. The internal emission system of the cabinet will automatically discharge the leaked gas into the atmosphere through a flame retardant at a high level, ensuring that no accident occurs.

[0030] A vent pipe 14 is installed at the top of the gas cylinder cabinet 1, and a hydrogen detection probe 2 is installed inside. The outlet of the vent pipe 14 is located outside the wall of the laboratory gun room. If there is a hydrogen leak, the control system will sound an alarm and light, and at the same time the discharge port will start to discharge the hydrogen leaked in the gas cylinder cabinet 1 to the external wastewater and waste gas system.

[0031] Specifically, the gas cylinder cabinet 1 is placed near the dedicated exhaust pipe inside the laboratory; the gas injection cabinet 2 is placed near the working pipe of the pump pipe 3 and is custom-designed. The outlet of the main pipe 11 is connected to the pump pipe 3 through a small-diameter high-pressure metal hose, which can be fixed in position after connection; the electrical control system is placed in the laboratory testing room.

[0032] The device itself has good airtightness, and hydrogen will not leak to the outside during transportation. No hydrogen-oxygen / air mixture will be formed during filling. If a small amount of leakage occurs, it can be vented in time.

[0033] Before use, connect the pipe 8 of the filling device to the working port of the device to be filled, which is the pump pipe 3. When using it, step S1 is to create a vacuum: S11, the experimental gun room should be cleared to ensure no one is present; S12. Transport hydrogen cylinder 6 from the gas station to the experimental gun room. The user uses a handheld hydrogen measuring instrument to confirm that the second valve 62 is in a good closed state. S13. Place hydrogen cylinder 6 inside cylinder cabinet 1 and connect hydrogen cylinder 6 to pipe 8. S14. Close the first hand valve 61, the third hand valve 63, the fifth hand valve 65, the sixth hand valve 66 and the sixth solenoid valve 26 to ensure that the valves at nitrogen cylinder 7, vent pipe 5, etc. are in the closed state. S15. Turn on vacuum pump 4, third solenoid valve 23, fifth solenoid valve 25 and seventh solenoid valve 27 to evacuate the corresponding pipes along the flow path and remove the air inside the pipes; when the pressure inside the pipes is less than 100Pa, close the fifth solenoid valve 25. S15. Open the sixth hand valve 66 to evacuate the pump pipe 3: When the internal pressure of the pipe along the flow path is less than 100Pa, close the vacuum pump 4 and the seventh solenoid valve 27 in sequence. S16. The hydrogen injection operator sequentially opens the first hand valve 61 and the second hand valve 62 of the gas cylinder to connect the gas source, and then evacuates the site. This ensures the safe isolation of personnel from hydrogen during subsequent gas injection processes.

[0034] Step S2, Hydrogen injection operation: S21. The operator remotely opens the second solenoid valve 22, the first probe 31 and the second probe 32 to measure the initial pressure and the pressure after depressurization of the hydrogen cylinder 6. After confirming that the gas source pressure and the gas injection pressure meet the experimental requirements, the operation continues. S22. Remotely open the fourth solenoid valve 24 and the third solenoid valve 23 in the on-site gas injection end, and hydrogen begins to be automatically injected into the pump pipe 3. S23. When the pressure reaches 90% of the target pressure value, the fourth solenoid valve 24 automatically closes and the fifth solenoid valve 25 opens (the fourth solenoid valve 24 and the fifth solenoid valve 25 have automatic and manual modes). The opening size of the manual valve 13 is verified by pre-calibration experimental settings to achieve precise pressure filling. S24. Measure the injection pressure using the third probe 33; once the pressure meets the requirements, remotely control the third solenoid valve 23, the fifth solenoid valve 25, and the second solenoid valve 22 in sequence to disconnect the hydrogen cylinder 6 gas source and the connection between the pump pipe 3 and the injection cabinet 2. S25. After the gas source is cut off, the operator goes to pump pipe 3 to close the sixth hand valve 66.

[0035] Step S3, Exhaust gas emission operation: S31. Remotely open the first solenoid valve 21. The first probe 31 and C2 measure the initial pressure and pressure after depressurization of the nitrogen cylinder 7. Check the gas source pressure and purging pressure (the purging pressure is provided by the purging device located at the outlet of the corresponding exhaust pipe 5 outside the wall of the laboratory gun room, not shown in the figure). After meeting the experimental requirements, continue the operation: S32. Remotely open the fourth solenoid valve 24 and the sixth solenoid valve 26 to perform the exhaust gas emission operation, using nitrogen to safely discharge the hydrogen gas inside the pipeline to the outside of the laboratory gun room wall: S33. After discharge is complete, close the sixth solenoid valve 26, the fourth solenoid valve 24 and the first solenoid valve 21 in sequence. S34. Personnel enter the laboratory and close the sixth hand valve 66, the second hand valve 62, the first hand valve 61 in sequence, and close the third hand valve 63 on the pump pipe 3. S35. Remove hydrogen cylinder 6 and transport it back to the gas station for storage; S36, Hydrogen injection operation completed.

[0036] This invention uses a vacuum system before the experiment and nitrogen purging after the experiment to ensure that there is no oxygen inside the system pipeline, and to ensure that no hydrogen-oxygen / air mixture is formed during the filling process. If there is a slight leak, it can be purged in time.

[0037] The venting range can be achieved by opening and closing solenoid valves and manual valves at different positions.

[0038] Throughout the three phases, the data acquisition system monitors and records changes in pressure.

[0039] All components, circuits, and parts in this invention are selected according to explosion-proof / flameproof requirements, and the electrical circuits and pipes are treated with explosion-proof / flameproof measures. Combined with the existing static electricity control measures in the laboratory, no ignition source can be generated during the gas injection process.

[0040] The rigid pipe sections in both pipe fitting 1 and pipe fitting 2 are made of seamless stainless steel metal pipes. The pipe connections should be made by welding or other effective methods to prevent hydrogen leakage. The connected pipes must meet the requirement of 2MPa for 2 hours, and the pressure drop should not exceed 0.5%.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0042] It should be noted that if the embodiments of the invention involve directional indicators (such as up and down), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0043] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B. Additionally, if the embodiments of the invention involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, "several" refers to two or more.

[0044] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the invention.

Claims

1. An automatic charging device for a two-stage light gas gun, characterized in that, The device includes: Gas cylinder cabinet (1) for storing and supplying gases, including nitrogen and hydrogen; The gas injection cabinet (2) includes the second pipe fitting on it, the inlet of which is connected to the gas outlet of the gas cylinder cabinet (1), and the outlet of which is connected to the working port of the pump pipe (3). The vacuum pump (4) has its inlet connected to the corresponding branch of the pipe fitting two, and is used to pump out the gas in the pipe fitting two and its corresponding branch as well as the gas in the pump pipe (3); after a vacuum environment is formed, the gas cylinder cabinet (1) delivers hydrogen to the pump pipe (3) through the sealed pipe fitting two. The vent pipe (5) has its inlet connected to the corresponding branch of the second pipe component. After the hydrogen injection is completed, nitrogen enters the second pipe component, and the nitrogen carries the hydrogen remaining in the second pipe component and is discharged from the vent pipe (5) to the outside of the laboratory gun room wall. Several opening and closing components are provided, respectively located on the gas cylinder cabinet (1), the second pipe component and the corresponding branch of the second pipe component, for controlling the gas flow path.

2. The automatic charging device for a secondary light gas gun according to claim 1, characterized in that, The gas cylinder cabinet (1) includes a hydrogen cylinder (6), a nitrogen cylinder (7), and a pipe fitting. The pipe fitting includes a pipe (8), a pipe (9), and a pipe (10). The outlet of the nitrogen cylinder (7) is connected to the inlet of the pipe (8), and the outlet of the hydrogen cylinder (6) is connected to the inlet of the pipe (9). The outlets of the pipe (8) and the pipe (9) are connected to the pipe (10). The pipe (10) extends to the outside of the cabinet and is used to connect to the inlet of the pipe fitting. The opening and closing component includes a first solenoid valve (21) installed on the first pipe (8) and a second solenoid valve (22) installed on the second pipe (9) near one end of the second pipe (9).

3. The automatic charging device for a secondary light gas gun according to claim 2, characterized in that, The second pipe component includes a main pipe (11), the inlet of which is connected to the outlet of the third pipe (10), and the outlet of which is connected to the inlet of the working pipe of the pump pipe (3). The opening and closing mechanism also includes a fourth solenoid valve (24) and a third solenoid valve (23). The main pipeline (11) is provided with the following components along its hydrogen injection direction: a first probe (31) for measuring the initial pressure of the hydrogen cylinder (6), a first-stage pressure reducing device (15), a second-stage pressure reducing device (16), a second probe (32) for measuring the pressure of the hydrogen cylinder (6) after pressure reduction, the fourth solenoid valve (24), a third probe (33) for measuring the injection pressure, and the third solenoid valve (23).

4. The automatic charging device for a secondary light gas gun according to claim 3, characterized in that, The device also includes an exhaust pipe (12) whose outlet is connected to the inlet of the vacuum pump (4), and the exhaust pipe (12) is provided with a seventh solenoid valve (27). A first three-way pipe (41) is provided between the third probe (33) and the third solenoid valve (23) on the main pipe (11). The cavity of the main pipe (11), the inlet of the exhaust pipe (12) and the inlet of the vent pipe (5) are respectively connected to the corresponding interfaces of the first three-way pipe (41). The opening and closing component also includes a sixth solenoid valve (26) installed on the drain pipe (5).

5. The automatic charging device for a secondary light gas gun according to claim 4, characterized in that, A branch pipe (51) is provided between the second probe (32) and the fourth solenoid valve (24) on the main pipe (11). A fifth solenoid valve (25) and a calibration valve (13) are provided on the branch pipe (51). By pre-setting the opening size of the fifth solenoid valve (25), the amount of hydrogen injected per unit time can be controlled by fine adjustment in the later stage of hydrogen injection.

6. The automatic charging device for a secondary light gas gun according to claim 5, characterized in that, The device also includes a second branch pipe (52), whose outlet is connected to the main pipe (11) near the outlet, and a third hand valve (63) is provided on it. A second three-way pipe (42) is provided between the corresponding second probe (32) and the fourth solenoid valve (24) on the main pipe (11). The cavity of the main pipe (11), the inlet of the first branch pipe (51) and the inlet of the second branch pipe (52) are respectively connected to the corresponding interface of the second three-way pipe (42).

7. The automatic charging device for a secondary light gas gun according to claim 6, characterized in that, The device also includes a third branch pipe (53), on which a fifth hand valve (65) is provided; A third three-way pipe (43) is provided between the first three-way pipe (41) and the seventh solenoid valve (27) on the exhaust pipe (12). The inlet of the third branch pipe (53), the cavity of the exhaust pipe (12) and the outlet of the first branch pipe (51) are respectively connected to the corresponding interface of the third three-way pipe (43). A sixth hand valve (66) is provided at the working port of the pump pipe (3).

8. The automatic charging device for a secondary light gas gun according to claim 1, characterized in that, The gas injection cabinet (2) is equipped with a hydrogen detection probe (17) for detecting the hydrogen leakage concentration inside the gas injection cabinet (2).

9. The automatic charging device for a secondary light gas gun according to claim 1, characterized in that, The top of the gas cylinder cabinet (1) is equipped with a vent pipe (14) and a hydrogen detection probe 2 is installed inside. The outlet of the vent pipe (14) is located outside the wall of the laboratory gun room and is used to discharge the hydrogen leaked from the gas cylinder cabinet (1) to the outside.

10. The automatic charging device for a secondary light gas gun according to claim 7, characterized in that, The first pipe (8) is provided with a first hand valve (61) and a pressure gauge one at the end near the nitrogen cylinder (7), and the second pipe (9) is provided with a second hand valve (62) and a pressure gauge two at the end near the hydrogen cylinder (6).

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