Alcohol filling gas-liquid pipeline system for vacuum environment and control method

Abstract

The invention discloses an alcohol filling gas-liquid pipeline system for a vacuum environment and a control method, and relates to the technical field of experimental process control, and the alcohol filling gas-liquid pipeline system comprises an alcohol gas path system, a filling system and an emptying system. The venturi tube and the pressure regulating valve are combined to realize stable flow control, the closed pipeline and the recovery storage tank are utilized to complete safe recovery of alcohol, and a fluid infusion mechanism without interrupting the vacuum environment is designed. The system can realize the alcohol filling flow precision of + / -1.5% in a vacuum environment, the liquid supplementing process is zero-interruption, and the problems of unstable flow control, unsafe liquid treatment, experiment interruption and the like in the prior art are solved. According to the scheme, the integration degree is high, the automation degree is high, a reliable liquid management solution is provided for an airspace engine plume simulation test, and the system has the remarkable advantages of being high in precision, safety and experiment efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental process control, and specifically to an alcohol filling gas-liquid pipeline system and a control method for a vacuum environment. Background Art

[0002] In the vacuum environment test of liquid rocket engines, alcohol is required to simulate plume liquid-phase pollutants. The prior art faces three major problems:

[0003] 1. Unstable flow control: Traditional equipment in a vacuum environment is difficult to accurately control the alcohol flow rate, and the repeatability of experimental results is poor;

[0004] 2. High risk of harmful liquid treatment: Alcohol is a flammable liquid, and the traditional system lacks a closed recovery mechanism, posing a safety hazard;

[0005] 3. High cost of experiment interruption: When the liquid is exhausted, it is necessary to break the vacuum environment to replenish the liquid, resulting in low experimental efficiency.

[0006] The existing system cannot simultaneously meet the requirements of high-precision flow control, safe recovery, and experimental continuity, and there is an urgent need for improvement.

[0007] In view of this, the present application is specifically proposed. Summary of the Invention

[0008] The purpose of the present invention is to provide an alcohol filling gas-liquid pipeline system and a control method for a vacuum environment to solve the problems mentioned in the above background art.

[0009] To solve the above technical problems, an alcohol filling gas-liquid pipeline system for a vacuum environment provided by the present invention includes: an alcohol gas pipeline system, an alcohol filling system, and a test liquid drainage system:

[0010] Alcohol gas pipeline system: It includes a first high-pressure gas cylinder, a first pressure reducing valve, a gas flowmeter, a gas pipeline pressure reducing valve, a pressure relief valve, a stop valve, and an intake electromagnetic valve;

[0011] Alcohol filling system: It includes a second high-pressure gas cylinder, a second pressure reducing valve, a filling gas valve, an alcohol filling storage tank, a liquid outlet valve, a first pressure regulating valve, a first liquid flowmeter, a first pressure sensor, a first Venturi tube, a second pressure sensor, a second pressure regulating valve, a liquid separation valve, a third pressure regulating valve, a second liquid flowmeter, a third pressure sensor, a second Venturi tube, a fourth pressure sensor, a fourth pressure regulating valve, a recovery liquid electromagnetic valve, an alcohol recovery storage tank, a recovery storage tank electronic scale, a filling liquid electronic scale, a third high-pressure gas cylinder, a third pressure reducing valve, a replenishing gas valve, and a replenishing valve;

[0012] Test liquid drainage system: It is used to drain the residual liquid in the pipeline and includes a fourth high-pressure gas cylinder, a fourth pressure reducing valve, a purging gas valve, a drain electromagnetic valve, and a drain valve;

[0013] Through the collaborative work of each part, this system can achieve precise filling, recovery, and pipeline evacuation of alcohol in a vacuum environment. The alcohol gas pipeline system can provide stable gas power and pressure control for the whole process; the alcohol filling system can achieve quantitative filling and recovery of alcohol, and ensure the accuracy and stability of filling through multiple sensors and regulating valves; the test liquid evacuation system can effectively avoid the influence of residual liquid in the pipeline on subsequent tests, improving the reliability of the system and the accuracy of the test.

[0014] Furthermore, in the alcohol filling system, the alcohol filling storage tank is connected to the main liquid pipeline through a liquid outlet valve. A pressure regulating valve 1, a liquid flowmeter 1, a Venturi tube 1, and a pressure sensor 2 are sequentially arranged on the main liquid pipeline; the outlet end of the Venturi tube 1 is branched into multiple branches through a liquid distribution valve. Each branch is respectively provided with a pressure regulating valve 3, a liquid flowmeter 2, a Venturi tube 2, a pressure sensor 3, a pressure regulating valve 4, and a pressure sensor 4; this design of the main liquid pipeline and multiple branches enables the alcohol filling to achieve multi-channel distribution to meet the requirements of different tests. Through the pressure regulating valve and the liquid flowmeter, the flow rate and pressure of each channel can be precisely controlled, and the Venturi tube further ensures the stability and accuracy of the flow rate. The pressure sensor real-time feeds back the pressure information, facilitating timely adjustment of system parameters and improving the filling accuracy and flexibility.

[0015] Furthermore, in the alcohol filling system, the high-pressure gas cylinder 3 is connected to the alcohol recovery storage tank through a pressure reducing valve 3 and a liquid replenishment gas valve. The alcohol recovery storage tank is connected to the alcohol filling storage tank through a liquid replenishment valve to achieve liquid replenishment; the alcohol gas pipeline system is connected to the pipeline of the alcohol filling system through an intake electromagnetic valve for gas-liquid replacement; the liquid replenishment function ensures the sufficiency of the liquid in the alcohol filling storage tank and avoids interrupting the test due to insufficient liquid. The gas-liquid replacement process can discharge the air in the pipeline, prevent the air from interfering with the alcohol filling and the test, and ensure the stability of the test environment and the accuracy of the test results. At the same time, through the control of the pressure reducing valve and the electromagnetic valve, the liquid replenishment and gas-liquid replacement processes are safer and more reliable.

[0016] Furthermore, in the test liquid evacuation system, the high-pressure gas cylinder 4 is connected to the main liquid pipeline and each branch through a pressure reducing valve 4 and a purging gas valve to blow the residual liquid in the pipeline into the alcohol recovery storage tank after the test; a drain electromagnetic valve and a drain valve are arranged at the end of the main liquid pipeline and each branch to assist in liquid evacuation; the test liquid evacuation system can effectively remove the residual liquid in the pipeline and avoid the residual liquid from contaminating and affecting subsequent tests. The high-pressure gas source can quickly and thoroughly blow the liquid into the recovery storage tank, improving the evacuation efficiency. The setting of the drain device further ensures the complete evacuation of the liquid in the pipeline, ensuring the cleanliness of the system and the smooth progress of the next test.

[0017] A control method for an alcohol filling gas-liquid pipeline system for a vacuum environment includes the following steps:

[0018] Pre - test preparation: Turn on the alcohol gas pipeline system. Use high - pressure gas cylinder 1 and the intake solenoid valve to introduce high - pressure gas into the pipeline. Sequentially open the stop valve and the pressure relief valve to discharge the air in the pipeline and complete the gas - liquid replacement. Confirm the liquid volume in the alcohol filling storage tank through the filling liquid electronic scale. If it is insufficient, supplement the liquid from the alcohol recovery storage tank through the replenishing gas valve and the replenishing valve.

[0019] In - test control: Open the filling gas valve. Use high - pressure gas cylinder 2 and pressure reducing valve 2 to provide pressure to the alcohol filling storage tank, so that the liquid enters the main liquid pipeline through the liquid outlet valve. Control the inlet pressure of Venturi tube 1 through pressure regulating valve 1, and achieve precise flow control in combination with liquid flowmeter 1. Each branch independently adjusts the flow through pressure regulating valve 3, pressure regulating valve 4 and Venturi tube 2. Real - time monitor the data of pressure sensor 1, pressure sensor 2, pressure sensor 3 and pressure sensor 4. When the liquid in the filling storage tank is insufficient, automatically start the liquid replenishment process, and monitor the recovered liquid volume through the recovery storage tank electronic scale to ensure that the vacuum environment is not interrupted.

[0020] Post - test treatment: Close the filling gas valve and the liquid outlet valve. Start the test liquid emptying system. Use high - pressure gas cylinder 4 and the purging gas valve to introduce high - pressure gas into the pipeline to blow the residual liquid into the alcohol recovery storage tank. Open the drain solenoid valve and the drain valve to empty the remaining liquid, and finally release the pipeline pressure through the pressure relief valve.

[0021] This control method covers all aspects before, during and after the test, ensuring the automation, precision, safety and reliability of the entire alcohol filling process. The pre - test preparation work ensures that the system is in good working condition, eliminates air interference and supplements sufficient liquid. The precise control during the test realizes the quantitative filling and multi - path distribution of alcohol, and the real - time monitoring and automatic liquid replenishment functions ensure the continuity and stability of the test. The post - test treatment work clears the residual liquid in the pipeline and prepares for the next test.

[0022] Furthermore, in the pre - test preparation step, the gas - liquid replacement process needs to continue until the gas purity in the pipeline reaches the predetermined standard, and the gas flow rate and pressure are precisely controlled through the gas flowmeter and the gas pipeline pressure reducing valve. Precisely controlling the gas flow rate and pressure during the gas - liquid replacement process can ensure that the air in the pipeline is fully discharged, so that the gas purity reaches the predetermined standard. This helps to create a pure test environment, reduce the influence of air on alcohol filling and test results, and improve the accuracy and reliability of the test.

[0023] Furthermore, in the control step of the test, when adjusting the flow rate of each branch, according to the data fed back by Pressure Sensor III and Pressure Sensor IV, the opening degrees of Pressure Regulating Valve III and Pressure Regulating Valve IV are dynamically adjusted to achieve precise matching of the flow rates of each branch; through real-time feedback and dynamic adjustment, the flow rates of each branch can be accurately controlled according to actual requirements, ensuring that the alcohol filling volume of each path can meet the test requirements. This precisely matched flow control improves the accuracy and repeatability of the test, making the test results more reliable.

[0024] Furthermore, in the post-treatment step of the test, after the liquid discharge device empties the remaining liquid, a small amount of high-pressure gas needs to be introduced again through the intake solenoid valve to purge the pipeline, ensuring that there is no residual liquid in the pipeline; purging the pipeline again can further remove the possibly residual liquid and ensure the thorough cleaning of the pipeline. This helps prevent the residual liquid from causing pollution and interference to the next test, and improves the service life of the system and the stability of the test.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. High-precision flow control: By adopting the cavitation effect of the Venturi tube, the flow rate is only related to the inlet pressure and the throat area, and is not affected by the backpressure fluctuation in the vacuum environment. The accuracy can reach ±1.5%, significantly improving the reliability of experimental data.

[0027] 2. Safe and closed recycling: Through the recovery liquid solenoid valve and the alcohol recovery storage tank, the whole process of alcohol is closed-loop recycled, avoiding the risk of leakage, meeting the environmental protection requirements, and reducing the potential safety hazards of the experiment.

[0028] 3. Guarantee of experimental continuity: The unique liquid replenishment system can automatically replenish the liquid without interrupting the vacuum environment, avoiding the experimental interruption caused by traditional liquid replenishment, and saving more than 50% of the time cost.

[0029] 4. Improvement of operation efficiency: The integrated automatic control process reduces manual intervention, reduces operation errors, and at the same time supports independent adjustment of multiple branches, meeting the requirements of complex experimental scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the overall flow chart of an alcohol filling gas-liquid pipeline system for a vacuum environment;

[0031] Figure 2 is the structural schematic diagram of an alcohol storage tank of an alcohol filling gas-liquid pipeline system for a vacuum environment;

[0032] Figure 3 is the structural schematic diagram of a Venturi tube structure of an alcohol filling gas-liquid pipeline system for a vacuum environment.

[0033] In the figure:

[0034] 1. Alcohol gas system; 101. High-pressure gas cylinder 1; 102. Pressure reducing valve 1; 103. Gas flow meter; 104. Gas pressure reducing valve; 105. Pressure relief valve; 106. Stop valve; 107. Air intake solenoid valve;

[0035] 2. Alcohol filling system; 201. High-pressure gas cylinder 2; 202. Pressure reducing valve 2; 203. Filling valve; 204. Alcohol filling tank; 205. Liquid outlet valve; 206. Pressure regulating valve 1; 207. Liquid flow meter 1; 208. Pressure sensor 1; 209. Venturi tube 1; 210. Pressure sensor 2; 211. Pressure regulating valve 2; 212. Liquid separator valve; 213. Pressure regulating valve 3; 214. Liquid flow meter 2; 215. Pressure sensor 3; 216. Venturi tube 2; 217. Pressure sensor 4; 218. Pressure regulating valve 4; 219. Recovery liquid solenoid valve; 220. Alcohol recovery tank; 221. Recovery tank electronic scale; 222. Filling liquid electronic scale; 223. High-pressure gas cylinder 3; 224. Pressure reducing valve 3; 225. Liquid replenishing valve; 226. Liquid replenishing valve;

[0036] 3. Test liquid emptying system; 301. Four high-pressure gas cylinders; 302. Four pressure reducing valves; 303. Air purge valve; 304. Liquid discharge solenoid valve; 305. Liquid discharge valve. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0038] See also Figures 1 - 3 The present invention provides a technical solution: an alcohol filling gas-liquid pipeline system and a control method for a vacuum environment, comprising:

[0039] 1. System composition and component functions

[0040] Alcohol gas path system 1: High-pressure gas cylinder 1 - 101: Provides high-pressure gas such as nitrogen, serving as the power source for gas-liquid replacement, purging, and liquid replenishment. Pressure reducing valve 1 - 102: Regulates the output gas pressure of high-pressure gas cylinder 1 - 101 to ensure system safety. Gas flow meter 103: Monitors the gas flow rate in real time and controls the gas volume for gas-liquid replacement and purging. Gas path pressure reducing valve 104: Secondarily regulates the gas pressure to precisely match the pressure requirements at different stages (e.g., 0.5 MPa during gas-liquid replacement and 0.2 MPa during purging). Pressure relief valve 105: Releases the residual pressure in the pipeline to ensure operation safety. Stop valve 106: Manually controls the on / off of the gas path for easy maintenance and troubleshooting. Inlet solenoid valve 107: Automatically controls the gas flowing into the pipeline to achieve an automated process.

[0041] Alcohol filling system 2: High-pressure gas cylinder 2 - 201: Provides a constant pressure for the alcohol filling storage tank 204, pushing the alcohol into the main liquid path. Pressure reducing valve 2 - 202: Regulates the output pressure of high-pressure gas cylinder 2 - 201 (e.g., 0.4 MPa) to ensure a stable filling process. Filling gas valve 203: Controls the on / off of the filling gas source to start / stop alcohol filling. Alcohol filling storage tank 204: Stores the alcohol for the test, and its capacity needs to meet the requirement of the longest test duration. Outlet valve 205: Controls the alcohol flowing from the storage tank into the main liquid path, usually an electric ball valve with a fast response speed. Pressure regulating valve 1 - 206: Regulates the inlet pressure of the main liquid path to cooperate with Venturi tube 1 - 209 to stabilize the flow rate. Liquid flow meter 1 - 207: Monitors the alcohol flow rate in the main liquid path (accuracy ±0.5%), and feeds back to the control system in real time. Venturi tube 1 - 209: Utilizes the cavitation effect to stabilize the flow rate of the main liquid path, unaffected by the downstream back pressure. Diverting valve 212: Divides the alcohol in the main liquid path into multiple branches to support simultaneous testing at multiple workstations. Pressure regulating valve 3 - 213, pressure regulating valve 4 - 218: Independently regulate the pressure of each branch to match different test requirements. Venturi tube 2 - 216: A flow stabilizing element for each branch to ensure the flow rate accuracy of the branch (±1.5%). Recovery liquid solenoid valve 219: Controls the residual alcohol to be recovered into the alcohol recovery storage tank 220 to prevent contamination. Alcohol recovery storage tank 220: Stores the recovered alcohol for recycling. High-pressure gas cylinder 3 - 223: Provides gas power for the liquid replenishment process, pressing the recovered alcohol into the filling storage tank 204. Liquid replenishment gas valve 225, liquid replenishment valve 226: Control the liquid replenishment process to achieve liquid replenishment without interrupting the vacuum environment.

[0042] Test liquid evacuation system 3: High-pressure gas cylinder 4 - 301: Provides purging gas (such as dry nitrogen), with adjustable pressure (0.1 - 0.3 MPa). Blowing gas valve 303: Controls the on / off of the purging gas to start the pipeline evacuation process. Drain solenoid valve 304, drain valve 305: Assist in evacuating the residual liquid at the end of the pipeline to ensure no liquid accumulation.

[0043] II. Implementation steps

[0044] (1) Preparation before the test: Gas-liquid replacement and liquid replenishment

[0045] Objective: To remove the air in the pipeline, ensure that the system is free from bubble interference, and ensure sufficient liquid in the storage tank for filling.

[0046] Step 1: Gas-liquid replacement

[0047] 1. Open high-pressure gas cylinder 101, adjust the output pressure to 0.5 MPa through pressure reducing valve 102, open stop valve 106 and intake solenoid valve 107, and introduce high-pressure gas into the pipeline of the alcohol filling system 2.

[0048] 2. Slowly open pressure relief valve 105 to discharge the air in the pipeline. Observe that the flow rate shown on gas flow meter 103 stabilizes at 5 L / min and continue for 5 minutes until the gas purity detector shows ≥99.9%.

[0049] 3. Reduce the pressure to 0.3 MPa through gas circuit pressure reducing valve 104 and maintain a slightly positive pressure in the pipeline to prevent external air from infiltrating.

[0050] Step 2: Liquid replenishment for the storage tank for filling

[0051] 1. Read the data of the filling liquid electronic scale 222. If the liquid weight in the alcohol filling storage tank 204 < 80% of the rated capacity (such as < 50 L), start liquid replenishment:

[0052] Open high-pressure gas cylinder 3 223 and adjust the pressure to 0.2 MPa through pressure reducing valve 3 224.

[0053] Open the liquid replenishment gas valve 225 and liquid replenishment valve 226 in sequence, and use the gas pressure to press the alcohol in the alcohol recovery storage tank 220 into the filling storage tank 204 until the filling liquid electronic scale 222 shows the rated weight (such as 60 L).

[0054] 2. Close the liquid replenishment gas valve 225 and liquid replenishment valve 226 to ensure no leakage.

[0055] (2) Control during the test: Precise filling and real-time monitoring

[0056] Objective: To achieve precise control of the flow rates of the main liquid path and each branch path, and automatic liquid replenishment to avoid interruption.

[0057] Step 1: Start the filling process

[0058] 1. Open the filling gas valve 203. High-pressure gas cylinder 2 201 applies a pressure of 0.4 MPa to the alcohol filling storage tank 204 through pressure reducing valve 2 202, and the alcohol flows into the main liquid path through the liquid outlet valve 205.

[0059] 2. Control of the main liquid path:

[0060] The inlet pressure of Venturi tube 1 - 209 is stabilized at 0.35 MPa by pressure regulating valve 1 - 206, and liquid flowmeter 1 - 207 shows that the main liquid path flow rate is 100 mL / min.

[0061] Pressure sensor 2 - 210 monitors the outlet pressure of Venturi tube 1 - 209 in real time. If the fluctuation exceeds ±5%, the control system automatically fine - tunes pressure regulating valve 1 - 206.

[0062] Step 2: Independent regulation of branch flow

[0063] 1. The main liquid path alcohol is split into 2 branches (such as branch A and branch B) through liquid - separating valve 212:

[0064] Branch A: Adjust pressure regulating valve 3 - 213 to 0.3 MPa. Liquid flowmeter 2 - 214 shows a flow rate of 50 mL / min. Venturi tube 2 - 216 stabilizes the flow rate, and pressure sensor 3 - 215 feeds back the pressure in real time.

[0065] Branch B: Adjust pressure regulating valve 4 - 218 to 0.25 MPa. Liquid flowmeter 2 - 214 shows a flow rate of 30 mL / min. Pressure sensor 4 - 217 feeds back the pressure in real time.

[0066] 2. The control system dynamically adjusts the valve opening every 100 ms according to the data of pressure sensors 215 and 217 to ensure that the branch flow error ≤ ±2%.

[0067] Step 3: Automatic liquid replenishment and safety monitoring

[0068] 1. The filling liquid electronic scale 222 continuously monitors the weight of the filling storage tank 204. When the remaining liquid < 20% (such as < 12 L):

[0069] The system automatically triggers the liquid replenishment process, repeats the liquid replenishment steps in the pre - test preparation, and does not close the filling gas valve 203 throughout the process to maintain the stability of the vacuum environment.

[0070] 2. The alcohol recovery storage tank electronic scale 221 records the weight of the alcohol recovery storage tank 220 in real time. If it > 90% of the rated capacity (such as > 45 L), an audible and visual alarm is given and the recovery liquid solenoid valve 219 is automatically closed.

[0071] (3) Post - test treatment: Residual recovery and pipeline emptying

[0072] Objective: Thoroughly recover the residual alcohol, empty the pipeline, and release the system pressure.

[0073] Step 1: Pipeline liquid recovery

[0074] 1. Close the filling gas valve 203 and the liquid outlet valve 205 to stop filling.

[0075] 2. Open the test liquid evacuation system 3:

[0076] The high-pressure gas cylinder four 301 outputs purging gas at 0.2 MPa through the pressure reducing valve four 302. Open the purge gas valve 303 and continuously purge the main liquid path and each branch for 5 minutes to blow the residual alcohol into the alcohol recovery storage tank 220.

[0077] Step 2: Auxiliary evacuation and pressure release

[0078] 1. Open the drain solenoid valve 304 and the drain valve 305 to discharge the residual liquid at the end of the pipeline until the liquid flowmeter one 207 shows 0.

[0079] 2. Pass high-pressure gas at 0.1 MPa through the intake solenoid valve 107 to purge the pipeline for 30 seconds again to ensure there is no residue.

[0080] 3. Finally, open the pressure relief valve 105 to release all the pressure in the alcohol gas pipeline system 1 and the alcohol filling system 2 until the pressure gauge shows 0.

[0081] It should be noted here that:

[0082] 1. Venturi tube flow control principle: When the alcohol flow rate in the Venturi tube one reaches the critical value, the static pressure drops to the saturated vapor pressure, forming cavitation. At this time, the flow rate is only related to the inlet pressure and the throat area, and the downstream back pressure fluctuation (such as the change in the vacuum chamber pressure) does not affect the flow accuracy.

[0083] 2. Closed-loop control system: The pressure sensor and the PLC controller are linked to adjust the opening of the pressure regulating valve in real time to form a "monitoring-feedback-regulation" closed loop to ensure the flow stability.

[0084] 3. Safety protection design: All solenoid valves are explosion-proof, and the pipeline is made of corrosion-resistant stainless steel to prevent safety accidents caused by alcohol leakage.

[0085] In summary, the vacuum environment alcohol filling gas-liquid pipeline system and control method provided by the present invention, through innovative designs such as Venturi tube pressure regulation, closed-loop recovery, and uninterrupted liquid replenishment, systematically solve the core problems in the prior art such as unstable flow control, unsafe liquid handling, and experiment interruption. This system not only achieves high-precision, high-safety, and high-continuity alcohol filling, but also simplifies the operation steps through an automated process and reduces the maintenance cost. Its engineering application can significantly improve the efficiency and reliability of the plume simulation test of the aerospace engine, provide key technical support for the ground test of the liquid propulsion system, and has important scientific research value and practical engineering significance.

Claims

1. An alcohol filling gas-liquid pipeline system for a vacuum environment, characterized in that: Including: An alcohol gas path system (1), an alcohol filling system (2), and a test liquid drainage system (3): The alcohol gas path system (1): includes a first high-pressure gas cylinder (101), a first pressure reducing valve (102), a gas flow meter (103), a gas path pressure reducing valve (104), a pressure relief valve (105), a stop valve (106), and an intake electromagnetic valve (107); The alcohol filling system (2): includes a second high-pressure gas cylinder (201), a second pressure reducing valve (202), a filling gas valve (203), an alcohol filling storage tank (204), a liquid outlet valve (205), a first pressure regulating valve (206), a first liquid flow meter (207), a first pressure sensor (208), a first Venturi tube (209), a second pressure sensor (210), a second pressure regulating valve (211), a liquid distribution valve (212), a third pressure regulating valve (213), a second liquid flow meter (214), a third pressure sensor (215), a second Venturi tube (216), a fourth pressure sensor (217), a fourth pressure regulating valve (218), a recovered liquid electromagnetic valve (219), an alcohol recovery storage tank (220), a recovery storage tank electronic scale (221), a filling liquid electronic scale (222), a third high-pressure gas cylinder (223), a third pressure reducing valve (224), a replenishing gas valve (225), and a replenishing valve (226); The test liquid drainage system (3): used to drain the residual liquid in the pipeline, includes a fourth high-pressure gas cylinder (301), a fourth pressure reducing valve (302), a purging gas valve (303), a liquid drainage electromagnetic valve (304), and a liquid drainage valve (305).

2. The alcohol filling gas-liquid pipeline system for a vacuum environment according to claim 1, characterized in that: In the alcohol filling system (2), the alcohol filling storage tank (204) is connected to the main liquid path through the liquid outlet valve (205), and a first pressure regulating valve (206), a first liquid flow meter (207), a first Venturi tube (209), and a second pressure sensor (210) are sequentially arranged on the main liquid path; the outlet end of the first Venturi tube (209) is branched through the liquid distribution valve (212) to multiple branches, and each branch is respectively provided with a third pressure regulating valve (213), a second liquid flow meter (214), a second Venturi tube (216), a third pressure sensor (215), as well as a fourth pressure regulating valve (218) and a fourth pressure sensor (217).

3. The alcohol filling gas-liquid pipeline system for a vacuum environment according to claim 1, characterized in that: In the alcohol filling system (2), the third high-pressure gas cylinder (223) is connected to the alcohol recovery storage tank (220) through the third pressure reducing valve (224) and the replenishing gas valve (225), and the alcohol recovery storage tank (220) is connected to the alcohol filling storage tank (204) through the replenishing valve (226) to achieve liquid replenishment; the alcohol gas path system (1) is connected to the pipeline of the alcohol filling system (2) through the intake electromagnetic valve (107) for gas-liquid replacement.

4. A gas-liquid pipeline system for alcohol filling in a vacuum environment according to claim 1, characterized in that: In the test liquid drainage system (3), the fourth high-pressure gas cylinder (301) is connected to the main liquid path and each branch through the fourth pressure reducing valve (302) and the purging gas valve (303) to blow the residual liquid in the pipeline into the alcohol recovery storage tank (220) after the test; a liquid drainage electromagnetic valve (304) and a liquid drainage valve (305) are arranged at the ends of the main liquid path and each branch to assist in draining the liquid.

5. A control method for an alcohol filling gas-liquid pipeline system used in a vacuum environment, characterized in that: Including the following steps: Preparation before the test: Turn on the alcohol gas pipeline system (1). Use high-pressure gas cylinder 1 (101) and intake solenoid valve (107) to introduce high-pressure gas into the pipeline. Sequentially open the stop valve (106) and pressure relief valve (105) to discharge the air in the pipeline and complete the gas-liquid replacement. Confirm the liquid volume in the alcohol filling storage tank (204) through the filling liquid electronic scale (222). If it is insufficient, supplement the liquid from the alcohol recovery storage tank (220) through the replenishing gas valve (225) and replenishing valve (226). Control during the test: Open the filling gas valve (203). Use high-pressure gas cylinder 2 (201) and pressure reducing valve 2 (202) to provide pressure to the alcohol filling storage tank (204), so that the liquid enters the main liquid pipeline through the liquid outlet valve (205). Control the inlet pressure of Venturi tube 1 (209) through pressure regulating valve 1 (206), and combine with liquid flowmeter 1 (207) to achieve precise flow control. Each branch independently adjusts the flow through pressure regulating valve 3 (213), pressure regulating valve 4 (218) and Venturi tube 2 (216). Real-time monitor the data of pressure sensor 1 (208), pressure sensor 2 (210), pressure sensor 3 (215) and pressure sensor 4 (217). When the liquid in the filling storage tank is insufficient, automatically start the replenishing liquid process, and monitor the recovered liquid volume through the recovery storage tank electronic scale (221) to ensure that the vacuum environment is not interrupted. Treatment after the test: Close the filling gas valve (203) and liquid outlet valve (205). Start the test liquid emptying system (3). Use high-pressure gas cylinder 4 (301) and purging gas valve (303) to introduce high-pressure gas into the pipeline to blow the residual liquid into the alcohol recovery storage tank (220). Open the drain solenoid valve (304) and drain valve (305) to empty the remaining liquid, and finally release the pipeline pressure through the pressure relief valve (105).

6. The control method of an alcohol filling gas-liquid pipeline system for a vacuum environment according to claim 5, characterized in that: In the preparation step before the test, the gas-liquid replacement process needs to continue until the gas purity in the pipeline reaches the predetermined standard, and the gas flow rate and pressure are precisely controlled through the gas flowmeter (103) and gas pipeline pressure reducing valve (104).

7. The control method of an alcohol filling gas-liquid pipeline system for a vacuum environment according to claim 5, characterized in that: In the control step during the test, when adjusting the flow rate of each branch, dynamically adjust the opening degrees of pressure regulating valve 3 (213) and pressure regulating valve 4 (218) according to the data fed back by pressure sensor 3 (215) and pressure sensor 4 (217) to achieve precise matching of the flow rates of each branch.

8. The control method of an alcohol filling gas-liquid pipeline system for a vacuum environment according to claim 5, characterized in that: In the treatment step after the test, after the drain device empties the remaining liquid, it is necessary to introduce a small amount of high-pressure gas into the pipeline again through the intake solenoid valve (107) to purge the pipeline to ensure that there is no residual liquid in the pipeline.

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