A liquid oxygen supply system and supply method

Abstract

The present invention relates to the field of rocket power test technology, and discloses a liquid oxygen supply system and a supply method. The liquid oxygen supply system includes: a liquid oxygen storage tank is provided with an extrusion gas inlet and a liquid oxygen inlet and outlet; a gas extrusion subsystem extrudes the liquid oxygen in the liquid oxygen storage tank; a liquid oxygen filling subsystem fills the liquid oxygen into the liquid oxygen storage tank; a main regulating valve is connected to the liquid oxygen inlet and outlet; multiple parallel branch input ends are connected to the main regulating valve, and multiple branch output ends respectively provide liquid oxygen for different station test pieces; a branch regulating valve is provided on each branch; the flow rate and pressure of each branch are adjusted by adjusting the opening of the main regulating valve and the opening of the branch regulating valve. The present application adjusts the flow rate of each branch by adjusting the opening of each branch regulating valve, so that the resistance of each branch is as close as possible, so as to achieve high-precision control of the flow rate and pressure of test pieces at different stations; and realizes multi-channel equal pressure and equal flow liquid oxygen distribution. The main regulating valve is combined to adjust the total flow rate.

Description

Technical Field

[0001] The invention relates to the technical field of rocket power testing, and in particular to a liquid oxygen supply system and a supply method. Background Art

[0002] For multiple test pieces in rocket power tests, liquid oxygen can be used as a fuel medium. The liquid oxygen supply system can deliver liquid oxygen to multiple test pieces. The liquid oxygen supply system generally includes: a liquid oxygen storage tank.

[0003] In rocket propulsion tests, nitrogen extrusion is usually used to adjust the pressure of the liquid oxygen storage tank to control the flow rate and pressure of liquid oxygen delivery. The above method of controlling the flow rate and pressure of liquid oxygen delivery is difficult to meet the requirements of equal flow and equal pressure distribution for each branch when there are many branches and each branch requires consistent flow. When the total liquid oxygen output flow is constant, the change of the flow of one or more branches will affect the flow distribution of other branches; if the pipeline design of the main pipe and branch pipes is unreasonable, it is easy to have a large flow at the proximal end and a small flow at the distal end, resulting in the proportion of liquid oxygen entering the test piece not meeting the test requirements, seriously affecting the normal operation of the test. Summary of the invention

[0004] In view of this, the present invention provides a liquid oxygen supply system to solve the problems that the existing method of adjusting the pressure of the liquid oxygen storage tank by nitrogen extrusion to control the flow rate and pressure of liquid oxygen delivery is difficult to meet the requirements of equal flow and equal pressure distribution for each branch when there are many branches and each branch requires a consistent flow rate; when the total liquid oxygen output flow rate is constant, the change of the flow rate of one or more branches will affect the flow distribution of other branches; if the pipeline design of the main pipe and the branch pipe is unreasonable, it is easy to have a large proximal flow rate and a small distal flow rate, resulting in the proportion of liquid oxygen entering the test piece not meeting the test requirements, seriously affecting the normal operation of the test.

[0005] In a first aspect, the present invention provides a liquid oxygen supply system, comprising:

[0006] A liquid oxygen storage tank, suitable for storing liquid oxygen; the liquid oxygen storage tank is provided with a squeeze gas inlet and a liquid oxygen inlet and outlet;

[0007] A gas extrusion subsystem connected to the extrusion gas inlet, the gas extrusion subsystem is suitable for extruding the liquid oxygen in the liquid oxygen storage tank, and the liquid oxygen is output from the liquid oxygen inlet and outlet;

[0008] A liquid oxygen filling subsystem, connected to the liquid oxygen inlet and outlet, and suitable for filling liquid oxygen into the liquid oxygen storage tank;

[0009] A main regulating valve connected to the liquid oxygen inlet and outlet;

[0010] Multiple parallel branches, the input ends are all connected to the main regulating valve, and the output ends of the multiple branches are suitable for providing liquid oxygen to the test pieces at different stations respectively; a branch regulating valve is provided on each branch; the liquid oxygen supply system is suitable for adjusting the flow and pressure of each branch by adjusting the opening of the main regulating valve in combination with adjusting the opening of the branch regulating valve. Beneficial effect: The present application adopts the above technical scheme to adjust the flow of each branch by adjusting the opening of each branch regulating valve, so that the resistance of each branch is as close as possible. The flow distribution is carried out according to the design indicators to meet the high-precision control requirements of the inlet flow and pressure of the test pieces at different stations, and provide the test pieces with liquid oxygen that meets the working conditions; thereby achieving liquid oxygen supply with consistent flow and wide range of changes in multiple branches, and realizing liquid oxygen distribution with equal pressure and equal flow in multiple channels. At the same time, the flow of the main circuit is adjusted in combination with the main regulating valve.

[0011] Optionally, a branch flow meter is provided on the branch; a branch pressure sensor is provided on the branch. Beneficial effect: The present application adopts the above technical solution, and the flow of each branch can be accurately measured by the branch flow meter; the pressure of each branch can be accurately measured by the branch pressure sensor.

[0012] Optionally, a branch on-off valve is provided on the branch.

[0013] Optionally, the gas extrusion subsystem comprises:

[0014] A pressurized gas supply structure, adapted to provide pressurized gas;

[0015] A plurality of boost valves, one end of which is connected to the boost gas supply structure;

[0016] The cut-off valve has one end connected to the other end of each of the multiple boosting valves, and the other end of the cut-off valve is connected to the extrusion gas inlet; the gas extrusion subsystem is suitable for opening at least one boosting valve by combination to adjust the extrusion force. Beneficial effect: The present application adopts the above technical solution, and the boosting pressure is directly adjusted by the boosting valve through the gas extrusion subsystem according to the working conditions.

[0017] Optionally, the liquid oxygen filling subsystem includes:

[0018] Liquid oxygen tanker, suitable for providing liquid oxygen;

[0019] A first filter connected to the liquid oxygen tanker;

[0020] One end of the filling valve is connected to the first filter, and the other end of the filling valve is connected to the liquid oxygen inlet and outlet. Beneficial effect: The present application adopts the above technical solution to provide reliable liquid oxygen filling through the liquid oxygen filling subsystem.

[0021] Optionally, the liquid oxygen storage tank is connected to a venting element.

[0022] Optionally, a liquid outlet valve and a main line pressure sensor are provided at the liquid oxygen inlet and outlet of the liquid oxygen storage tank.

[0023] Optionally, a main valve, a main flow meter and a second filter connected in series are provided on the pipeline connecting the liquid oxygen inlet and outlet of the liquid oxygen storage tank and the input ends of the multiple branches. Beneficial effect: The present application adopts the above technical solution, and the total flow of the pipeline can be accurately measured by the main flow meter.

[0024] Optionally, each branch is also connected to a discharge valve. Beneficial effect: The present application adopts the above technical solution, and by setting a discharge valve, liquid oxygen can be discharged to a safe place during pipeline precooling or emergency situations in rocket power system tests.

[0025] In a second aspect, the present invention further provides a liquid oxygen supply method, using the liquid oxygen supply system, comprising:

[0026] Calculate the theoretical flow and theoretical pressure of each branch, the theoretical opening of the main control valve and the theoretical opening of each branch control valve;

[0027] Open the main regulating valve according to the theoretical opening of the main regulating valve and open each branch regulating valve according to the theoretical opening of each branch regulating valve;

[0028] After the flow of each branch is stable, the flow of each branch is sorted in ascending order according to the size of the flow of each branch: Q1, Q2, Q3, ..., Qn;

[0029] Reduce the opening of the branch regulating valve of the branch where the flow rate is Q2, so that the flow rate of the branch where the original flow rate is Q2 is Q1', and at the same time, the flow rate of the branch where the original flow rate is Q1 is also Q1';

[0030] Reduce the opening of the branch regulating valve of the branch where the flow rate is Q3, so that the flow rate of the branch where the original flow rate is Q3 is Q2', and at the same time, the flow rates of the two branches where the flow rate is Q1' are also Q2';

[0031] Referring to the above method, adjust the flow of each branch to be consistent;

[0032] When the theoretical flow rate and actual flow rate of each branch are inconsistent, adjust the opening of the main regulating valve to make the theoretical flow rate and actual flow rate of each branch consistent. Beneficial effect: The present application adopts the above technical solution to adjust the flow rate of each branch by adjusting the opening of each branch regulating valve, so that the resistance of each branch is as close as possible. Flow distribution is carried out according to the design indicators to meet the high-precision control requirements of the inlet flow rate and pressure of the test pieces at different workstations, and provide the test pieces with liquid oxygen that meets the working conditions; thereby achieving a liquid oxygen supply with consistent flow rates and wide variations in multiple branches, and achieving liquid oxygen distribution with equal pressure and equal flow rates in multiple branches. At the same time, the main regulating valve is combined to adjust the flow rate of the main circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A connection diagram of an energy liquid delivery and distribution system provided in an embodiment of the present invention;

[0035] Figure 2 The figure is a schematic diagram of the process steps of the liquid oxygen supply method provided in an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1. First liquid oxygen storage tank; 2. Second liquid oxygen storage tank; 3. First boost valve; 4. Second boost valve; 5. Third boost valve; 6. First shut-off valve; 7. Second shut-off valve; 8. First vent element; 9. Second vent element; 10. Liquid oxygen tank truck; 11. First filter; 12. Filling valve; 13. First pressure sensor; 14. First liquid outlet valve; 15. Second pressure sensor; 16. Second liquid outlet valve; 17. Main valve; 18. Main flow meter; 19. Main regulating valve; 20. Second filter; 21. First branch regulating valve; 22. First branch flow meter; 23. First branch pressure sensor; 24. First branch on-off valve; 25. First discharge valve; 26. Second branch regulating valve; 27. Second branch flow meter; 28. Second branch pressure sensor sensor; 29, second branch on-off valve; 30, second discharge valve; 31, third branch regulating valve; 32, third branch flowmeter; 33, third branch pressure sensor; 34, third branch on-off valve; 35, third discharge valve; 36, fourth branch regulating valve; 37, fourth branch flowmeter; 38, fourth branch pressure sensor; 39, fourth branch on-off valve; 40, fourth discharge valve; 41, fifth branch regulating valve; 42, fifth branch flowmeter; 43, fifth branch pressure sensor; 44, fifth branch on-off valve; 45, fifth discharge valve; 46, pressurized gas supply structure; 47, first station test piece; 48, second station test piece; 49, third station test piece; 50, fourth station test piece; 51, fifth station test piece. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] The current liquid oxygen delivery flow distribution usually uses branches with the same diameter to squeeze the liquid oxygen to each branch. The above liquid oxygen supply method is difficult to meet the equal flow and equal pressure distribution of each branch. The liquid oxygen supply flow is easy to change, and the flow pressure distribution of each branch after the change is difficult to stabilize. It is also due to the above reasons that the present application proposes a liquid oxygen supply system and supply method.

[0040] like Figure 1 A specific implementation of the liquid oxygen supply system shown includes: a liquid oxygen storage tank, a gas extrusion subsystem, a liquid oxygen filling subsystem, a main regulating valve 19 and a plurality of parallel branches.

[0041] The liquid oxygen storage tank is suitable for storing liquid oxygen; the liquid oxygen storage tank is provided with a squeeze gas inlet and a liquid oxygen inlet and outlet. Figure 1 As shown, the liquid oxygen storage tank includes: a first liquid oxygen storage tank 1 and a second liquid oxygen storage tank 2.

[0042] The gas extrusion subsystem is connected to the extrusion gas inlet, and the gas extrusion subsystem is suitable for extruding the liquid oxygen in the liquid oxygen storage tank, and the liquid oxygen is output from the liquid oxygen inlet and outlet. The liquid oxygen filling subsystem is connected to the liquid oxygen inlet and outlet, and the liquid oxygen filling subsystem is suitable for filling liquid oxygen into the liquid oxygen storage tank. The main regulating valve 19 is connected to the liquid oxygen inlet and outlet. The input ends of multiple parallel branches are connected to the main regulating valve 19, and the output ends of multiple branches are suitable for providing liquid oxygen to test pieces at different workstations respectively; a branch regulating valve is provided on each branch; the liquid oxygen supply system is suitable for adjusting the flow and pressure of each branch by adjusting the opening of the main regulating valve 19, combined with adjusting the opening of the branch regulating valve. The main regulating valve 19 and the branch regulating valve described in the present application are both high-performance regulating valves with high positioning accuracy. Specifically, the positioning accuracy is less than 0.5%; the high-performance regulating valve has a rapid adjustment action. Specifically, within the adjustment range of 10%, the adjustment time is not more than 1s.

[0043] like Figure 1As shown, the liquid oxygen supply system is provided with five parallel branches: a first branch, a second branch, a third branch, a fourth branch and a fifth branch; the output ends of the first branch, the second branch, the third branch, the fourth branch and the fifth branch are respectively connected to the first station test piece 47, the second station test piece 48, the third station test piece 49, the fourth station test piece 50 and the fifth station test piece 51.

[0044] The branch regulating valves include: a first branch regulating valve 21, a second branch regulating valve 26, a third branch regulating valve 31, a fourth branch regulating valve 36 and a fifth branch regulating valve 41, which are respectively arranged on the first branch, the second branch, the third branch, the fourth branch and the fifth branch.

[0045] Furthermore, a branch flow meter is provided on the branch; Figure 1 As shown, the branch flowmeter includes: a first branch flowmeter 22, a second branch flowmeter 27, a third branch flowmeter 32, a fourth branch flowmeter 37 and a fifth branch flowmeter 42, which are respectively arranged on the first branch, the second branch, the third branch, the fourth branch and the fifth branch. A branch pressure sensor is arranged on the branch; Figure 1 As shown, the branch pressure sensor includes: a first branch pressure sensor 23, a second branch pressure sensor 28, a third branch pressure sensor 33, a fourth branch pressure sensor 38 and a fifth branch pressure sensor 43, which are respectively arranged on the first branch, the second branch, the third branch, the fourth branch and the fifth branch. A branch on-off valve is arranged on the branch; Figure 1 As shown, the branch on-off valves include: a first branch on-off valve 24, a second branch on-off valve 29, a third branch on-off valve 34, a fourth branch on-off valve 39 and a fifth branch on-off valve 44, which are respectively arranged on the first branch, the second branch, the third branch, the fourth branch and the fifth branch.

[0046] Specifically, the gas extrusion subsystem includes: a boost gas supply structure 46, a plurality of boost valves and a cut-off valve. The boost valve may be a boost solenoid valve. The boost gas supply structure 46 is suitable for providing boost gas, and the boost gas may be nitrogen; one end of the plurality of boost valves is connected to the boost gas supply structure 46. One end of the cut-off valve is respectively connected to the other end of the plurality of boost valves, and the other end of the cut-off valve is connected to the extrusion gas inlet; the gas extrusion subsystem is suitable for adjusting the extrusion force by opening at least one boost valve in combination. Figure 1As shown, the boost valve includes: a first boost valve 3, a second boost valve 4 and a third boost valve 5 arranged in parallel; the cut-off valve includes: a first cut-off valve 6 and a second cut-off valve 7; the boosting method can be one-way boosting, such as opening one of the first boost valve 3, the second boost valve 4 or the third boost valve 5; it can also be two-way boosting, such as opening the first boost valve 3 and the third boost valve 5 at the same time; it can also be three-way boosting, that is, opening the first boost valve 3, the second boost valve 4 and the third boost valve 5 at the same time. The first cut-off valve 6 is connected to the extruded gas inlet of the first liquid oxygen storage tank 1, and the second cut-off valve 7 is connected to the extruded gas inlet of the second liquid oxygen storage tank 2. According to different flow conditions, by opening and closing the first cut-off valve 6 and the second cut-off valve 7, the first liquid oxygen storage tank 1 and the second liquid oxygen storage tank 2 can be pressurized at the same time or one of the first liquid oxygen storage tank 1 and the second liquid oxygen storage tank 2 can be pressurized. For example, the first cut-off valve 6 and the second cut-off valve 7 are opened at the same time to pressurize the first liquid oxygen storage tank 1 and the second liquid oxygen storage tank 2 at the same time; the first cut-off valve 6 is opened and the second cut-off valve 7 is closed to pressurize only the first liquid oxygen storage tank 1; the second cut-off valve 7 is opened and the first cut-off valve 6 is closed to pressurize only the second liquid oxygen storage tank 2.

[0047] Specifically, the liquid oxygen filling subsystem includes: a liquid oxygen tanker 10, a first filter 11 and a filling valve 12. The liquid oxygen tanker 10 is suitable for providing liquid oxygen. The first filter 11 is connected to the liquid oxygen tanker 10. One end of the filling valve 12 is connected to the first filter 11, and the other end of the filling valve 12 is connected to the liquid oxygen inlet and outlet.

[0048] Furthermore, the liquid oxygen storage tank is connected to a venting element; the venting element is a venting valve; Figure 1 As shown, the first liquid oxygen storage tank 1 is connected to a first venting element 8; the second liquid oxygen storage tank 2 is connected to a second venting element 9. A liquid outlet valve and a main line pressure sensor are provided at the liquid oxygen inlet and outlet of the liquid oxygen storage tank; Figure 1 As described, a first liquid outlet valve 14 and a first pressure sensor 13 are provided at the liquid oxygen inlet and outlet of the first liquid oxygen storage tank 1; a second liquid outlet valve 16 and a second pressure sensor 15 are provided at the liquid oxygen inlet and outlet of the second liquid oxygen storage tank 2. According to different flow conditions, by opening and closing the first liquid outlet valve 14 and the second liquid outlet valve 16, the first liquid oxygen storage tank 1 and the second liquid oxygen storage tank 2 can simultaneously deliver liquid oxygen; or the first liquid oxygen storage tank 1 or the second liquid oxygen storage tank 2 can deliver liquid oxygen.

[0049] A main valve 17, a main flow meter 18 and a second filter 20 connected in series are provided on the pipeline connecting the liquid oxygen inlet and outlet of the liquid oxygen storage tank and the input ends of the multiple branches. Each branch is also connected to a discharge valve; Figure 1As shown, the relief valve includes: a first relief valve 25, a second relief valve 30, a third relief valve 35, a fourth relief valve 40 and a fifth relief valve 45, which are respectively connected to the first branch, the second branch, the third branch, the fourth branch and the fifth branch.

[0050] Furthermore, in the liquid oxygen supply system, the pipe specifications, lengths and heights of each branch are made consistent as much as possible; elbows and reducers are minimized to reduce flow resistance.

[0051] After actual verification, the liquid oxygen supply system proposed in this application has a flow rate of 32m 3 / h, the flow difference between each branch is controlled at 0.3m 3 / h; when the pressure of each branch is 3.2MPa, the pressure difference between the branches is controlled within 0.011MPa.

[0052] like Figure 2 As shown, the present invention also provides a liquid oxygen supply method, using the liquid oxygen supply system, comprising the following steps:

[0053] S1, calculating the theoretical flow rate, theoretical pressure, theoretical opening of the main regulating valve 19 and theoretical opening of each branch regulating valve;

[0054] S2, opening the main regulating valve 19 according to the theoretical opening degree of the main regulating valve and opening each branch regulating valve according to the theoretical opening degree of each branch regulating valve;

[0055] S3, after the flow of each branch is stable, the flow of each branch is sorted in ascending order according to the size of the flow of each branch: Q1, Q2, Q3, ..., Qn;

[0056] S4, reduce the opening of the branch regulating valve of the branch where the flow rate is Q2, so that the flow rate of the branch where the original flow rate is Q2 is Q1', and at the same time, the flow rate of the branch where the original flow rate is Q1 is also Q1';

[0057] S5, reduce the opening of the branch regulating valve of the branch where the flow rate is Q3, so that the flow rate of the branch where the original flow rate is Q3 is Q2', and at the same time, the flow rates of the two branches where the flow rate is Q1' are also Q2';

[0058] S6. Referring to the above method, adjust the flow of each branch to be consistent;

[0059] S7. When the theoretical flow rate and the actual flow rate of each branch are inconsistent, adjust the opening of the main regulating valve 19 to make the theoretical flow rate and the actual flow rate of each branch consistent.

[0060] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A liquid oxygen supply method, applied to a liquid oxygen supply system, characterized in that: include: Calculate the theoretical flow and theoretical pressure of each branch, the theoretical opening of the main control valve (19) and the theoretical opening of each branch control valve; Opening the main regulating valve (19) according to the theoretical opening of the main regulating valve (19) and opening each branch regulating valve according to the theoretical opening of each branch regulating valve; After the flow of each branch is stable, the flow of each branch is sorted in ascending order according to the size of the flow of each branch: Q1, Q2, Q3, ..., Qn; Reduce the opening of the branch regulating valve of the branch where the flow rate is Q2, so that the flow rate of the branch where the original flow rate is Q2 is Q1', and at the same time, the flow rate of the branch where the original flow rate is Q1 is also Q1'; Reduce the opening of the branch regulating valve of the branch where the flow rate is Q3, so that the flow rate of the branch where the original flow rate is Q3 is Q2', and at the same time, the flow rates of the two branches where the flow rate is Q1' are also Q2'; Refer to the above method to adjust the flow of each branch to be consistent; When the theoretical flow rate and the actual flow rate of each branch are inconsistent, the opening of the main regulating valve (19) is adjusted so that the theoretical flow rate and the actual flow rate of each branch are consistent; The liquid oxygen supply system comprises: A liquid oxygen storage tank, suitable for storing liquid oxygen; the liquid oxygen storage tank is provided with a squeeze gas inlet and a liquid oxygen inlet and outlet; A gas extrusion subsystem connected to the extrusion gas inlet, the gas extrusion subsystem is suitable for extruding the liquid oxygen in the liquid oxygen storage tank, and the liquid oxygen is output from the liquid oxygen inlet and outlet; A liquid oxygen filling subsystem, connected to the liquid oxygen inlet and outlet, and suitable for filling liquid oxygen into the liquid oxygen storage tank; A main regulating valve (19), connected to the liquid oxygen inlet and outlet; The input ends of the plurality of parallel branches are all connected to the main regulating valve (19), and the output ends of the plurality of branches are suitable for respectively providing liquid oxygen to test pieces at different workstations; a branch regulating valve is provided on each branch; and the liquid oxygen supply system is suitable for adjusting the flow and pressure of each branch by adjusting the opening of the main regulating valve (19) in combination with adjusting the opening of the branch regulating valve.

2. The liquid oxygen supply method according to claim 1, characterized in that: A branch flowmeter is provided on the branch road; and a branch pressure sensor is provided on the branch road.

3. The liquid oxygen supply method according to claim 1, characterized in that: A branch on-off valve is arranged on the branch.

4. The liquid oxygen supply method according to any one of claims 1 to 3, characterized in that: The gas extrusion subsystem comprises: A pressurized gas supply structure (46) adapted to provide pressurized gas; a plurality of boosting valves, one end of which is connected to the boosting gas supply structure (46); One end of the cut-off valve is respectively connected to the other end of the plurality of boosting valves, and the other end of the cut-off valve is connected to the extrusion gas inlet; the gas extrusion subsystem is suitable for opening at least one boosting valve by combination to adjust the extrusion force.

5. The liquid oxygen supply method according to any one of claims 1 to 3, characterized in that: The liquid oxygen filling subsystem comprises: A liquid oxygen tanker (10) adapted to provide liquid oxygen; A first filter (11) connected to the liquid oxygen tanker (10); A filling valve (12) has one end connected to the first filter (11), and the other end of the filling valve (12) is connected to the liquid oxygen inlet and outlet.

6. The liquid oxygen supply method according to any one of claims 1 to 3, characterized in that: The liquid oxygen storage tank is connected with a venting element.

7. The liquid oxygen supply method according to any one of claims 1 to 3, characterized in that: A liquid outlet valve and a main line pressure sensor are provided at the liquid oxygen inlet and outlet of the liquid oxygen storage tank.

8. The liquid oxygen supply method according to any one of claims 1 to 3, characterized in that: A main valve (17), a main flow meter (18) and a second filter (20) connected in series are provided on a pipeline connecting the liquid oxygen inlet and outlet of the liquid oxygen storage tank and the input ends of the plurality of branches.

9. The liquid oxygen supply method according to any one of claims 1 to 3, characterized in that: Each branch is also connected with a discharge valve.

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