A test gas distribution system for hydrogen and oxygen engines

Abstract

The present invention relates to the field of rocket engine test technology, and discloses a hydrogen-oxygen engine test gas distribution system, including: an engine helium supply module has a first state in which the engine is connected to the purge gas interface of the hydrogen-oxygen engine before the test to evacuate the nitrogen in the inner cavity pipeline; and has a third state in which the engine adopts helium to purge and rewarm the hydrogen-oxygen engine after the test; an engine nitrogen supply module has a fourth state in which the engine is connected to the purge gas interface of the hydrogen-oxygen engine before the test to evacuate the air in the inner cavity pipeline, and has a fifth state in which the engine is connected to the hydrogen-oxygen engine after the test to purge and rewarm the hydrogen-oxygen engine with heated nitrogen. The present application provides helium or nitrogen to the hydrogen-oxygen engine in stages according to specific working conditions before, during and after the hydrogen-oxygen engine test through the engine helium supply module and the engine nitrogen supply module, effectively saving helium energy and significantly reducing test costs.

Description

Technical Field

[0001] The invention relates to the technical field of rocket engine testing, and in particular to a hydrogen-oxygen engine testing gas distribution system. Background Art

[0002] With the development of rocket engine technology, the requirements for various test functions and success rates of hydrogen-oxygen engines are getting higher and higher. In terms of test function requirements, it is necessary to supply propellant media, which include: liquid hydrogen propellant and liquid oxygen propellant; and before, during and after the hydrogen-oxygen engine test, a large amount of gas medium needs to be supplied to the hydrogen-oxygen engine and the propellant supply system to ensure the smooth progress of the engine test and effective post-test processing. However, the existing hydrogen-oxygen engine supplies a single gas medium in different test stages. When the single gas medium is helium, the hydrogen-oxygen engine test requires huge costs; when the single gas medium is nitrogen, because the liquefaction point temperature of nitrogen is higher than the liquefaction point temperature of liquid hydrogen, nitrogen cannot effectively complete the full-process test gas distribution work of the hydrogen-oxygen engine. Summary of the invention

[0003] In view of this, the present invention provides a hydrogen-oxygen engine test gas distribution system, proposes a phased gas supply strategy, and designs a multi-media phased gas supply and distribution system to solve the problem that the existing hydrogen-oxygen engine supplies a single gas medium in different test stages; when the single gas medium is helium, the hydrogen-oxygen engine test requires huge costs; when the single gas medium is nitrogen, since the liquefaction point temperature of nitrogen is higher than the liquefaction point temperature of liquid hydrogen, nitrogen cannot effectively complete the full-process test gas distribution work of the hydrogen-oxygen engine. The present application also designs a forward and reverse bidirectional dual-flow engine cylinder filling and discharging subsystem, as well as a symmetrically designed liquid hydrogen extrusion gas supply subsystem and a liquid oxygen extrusion gas supply subsystem, which significantly improves the test efficiency, the interchangeability of equipment models, and the reliability of the system.

[0004] The present invention provides a hydrogen-oxygen engine test gas distribution system, comprising:

[0005] A liquid hydrogen extrusion gas supply subsystem is connected to the liquid hydrogen tank, and the liquid hydrogen extrusion gas supply subsystem is suitable for providing a first extrusion gas to the liquid hydrogen tank, so as to squeeze the liquid hydrogen propellant in the liquid hydrogen tank into the liquid hydrogen pipeline of the hydrogen-oxygen engine, and the propellant pipeline belongs to the inner cavity pipeline;

[0006] a liquid oxygen extrusion gas supply subsystem connected to the liquid oxygen tank, wherein the liquid oxygen extrusion gas supply subsystem is adapted to provide a second extrusion gas to the liquid oxygen tank, thereby extruding the liquid oxygen propellant in the liquid oxygen tank into the liquid oxygen pipeline of the hydrogen-oxygen engine; the liquid hydrogen pipeline and the liquid oxygen pipeline are collectively referred to as a propellant pipeline;

[0007] The engine helium supply module is connected to the hydrogen-oxygen engine through a third valve, and the engine helium supply module has a first state of being connected to the purge gas interface of the hydrogen-oxygen engine before the hydrogen-oxygen engine test to provide helium to the hydrogen-oxygen engine to exhaust the nitrogen in the inner cavity pipeline; and a second state of being connected to the purge gas interface of the hydrogen-oxygen engine during the hydrogen-oxygen engine test to provide helium as the purge gas to the hydrogen-oxygen engine; and a third state of being connected to the purge gas interface of the hydrogen-oxygen engine when the temperature is restored after the hydrogen-oxygen engine test, and when the temperature of the hydrogen-oxygen engine is within the temperature range of liquid hydrogen, providing helium to purge and rewarm the hydrogen-oxygen engine with helium;

[0008] The engine nitrogen supply module has a fourth state in which, before the hydrogen-oxygen engine test, it is connected to the purge gas interface of the hydrogen-oxygen engine through a fourth valve to provide nitrogen to the hydrogen-oxygen engine to exhaust the air in the inner cavity pipeline, and has a fifth state in which, when the temperature is restored after the hydrogen-oxygen engine test, it is connected to the purge gas interface of the hydrogen-oxygen engine through a fifth valve, and when the temperature of the hydrogen-oxygen engine is higher than the temperature range of liquid nitrogen, it provides heated nitrogen to purge and reheat the hydrogen-oxygen engine with the heated nitrogen;

[0009] The hydrogen-oxygen engine test gas distribution system is suitable for, before the hydrogen-oxygen engine test, first closing the third valve and the fifth valve, opening the fourth valve, so that the engine nitrogen supply module is in the fourth state, then discharging the nitrogen filled in the inner cavity pipeline and the remaining air, repeating the process of filling and discharging nitrogen into the inner cavity pipeline for many times, until the inner cavity pipeline meets the dew point requirement of the propellant, and discharging the nitrogen in the inner cavity pipeline; then, opening the third valve, closing the fourth valve and the fifth valve, so that the engine helium supply module is in the first state, then discharging the helium filled in the inner cavity pipeline and the remaining nitrogen, repeating the process of filling and discharging helium into the inner cavity pipeline for many times, until the inner cavity pipeline meets the oxygen-nitrogen component requirement of the propellant; and after the hydrogen-oxygen engine test, first opening the third valve, closing the fourth valve and the fifth valve, so that the engine helium supply module is in the third state, then, when the temperature of the hydrogen-oxygen engine is higher than the temperature range of liquid nitrogen, closing the third valve and the fourth valve, opening the fifth valve, so that the engine nitrogen supply module is in the fifth state. Beneficial effect: The present application adopts the above technical solution, and provides helium or nitrogen to the hydrogen-oxygen engine in stages according to specific working conditions before, during and after the hydrogen-oxygen engine test through the engine helium supply module and the engine nitrogen supply module, which effectively saves helium energy and significantly reduces the test cost. Specifically, nitrogen with a lower boiling point is first used to evacuate the air in the inner cavity pipeline, and then helium with an even lower boiling point is used to evacuate the air in the inner cavity pipeline, so that the inner cavity pipeline has the conditions to accept low-temperature propellants, and avoids the use of a single helium medium, thereby achieving the effect of saving helium; in addition, in the hydrogen-oxygen engine test, helium is always supplied, and after the hydrogen-oxygen engine test, helium is first used to blow off and reheat, and then when the temperature of the hydrogen-oxygen engine is higher than the liquefaction point of nitrogen, heated nitrogen is used for blowing off and reheating, and the nitrogen is heated when the temperature is restored to speed up the reheating speed of the engine, thereby improving the operation of blowing off and reheating. working efficiency; and, the liquefaction point temperature of helium is: -268.93℃, and the boiling point of liquid hydrogen is -253℃. At -253℃, helium is in gaseous state and can be used for blowing. The use of helium matches the temperature range of the corresponding liquid hydrogen to ensure the blowing effect; and, when the hydrogen-oxygen engine is heated to above the temperature range of liquid nitrogen, the liquefaction point temperature of nitrogen is -196℃. When it is above -196℃, nitrogen is in gaseous state. Then, nitrogen medium can be used instead of helium medium for blowing and reheating, which can effectively save helium energy, significantly reduce the test cost of the hydrogen-oxygen engine, and meet the test requirements of the hydrogen-oxygen engine.

[0010] Optionally, the engine helium supply module comprises:

[0011] a first helium supply structure adapted to provide helium;

[0012] a fifth pressure reducer, one end of which is connected to the first helium supply structure; the other end of the fifth pressure reducer is connected to the hydrogen-oxygen engine through a third valve;

[0013] The engine nitrogen supply module comprises:

[0014] a first nitrogen supply structure adapted to provide nitrogen;

[0015] a third pressure reducer, one end of which is connected to the first nitrogen supply structure;

[0016] A first nitrogen supply pipeline, one end of which is connected to the other end of the third pressure reducer through a fourth valve, and the other end of the first nitrogen supply pipeline is connected to the hydrogen-oxygen engine;

[0017] One end of the second nitrogen supply pipeline is connected to the other end of the third pressure reducer, and the other end of the second nitrogen supply pipeline is connected to the hydrogen-oxygen engine; and a heater is provided on the second nitrogen supply pipeline, and the heater is suitable for heating the nitrogen. Beneficial effect: The present application adopts the above technical solution to ensure that auxiliary gas that meets the test requirements is supplied to the hydrogen-oxygen engine, and the reheating and blowing efficiency is improved by heating the nitrogen.

[0018] Optionally, the engine helium supply module further comprises:

[0019] a second helium supply structure adapted to provide helium;

[0020] a first valve, one end of which is connected to one end of the second helium supply structure;

[0021] a third throttling element, one end of which is connected to the other end of the first valve, and the other end of which is connected to the gas cylinder charging interface of the hydrogen-oxygen engine; the third throttling element is suitable for reducing the flow rate of helium;

[0022] A discharge pipeline connected to the pipeline between the third throttling element and the gas cylinder charging interface of the hydrogen-oxygen engine;

[0023] A second valve, disposed on the discharge pipeline;

[0024] The second helium supply structure, the first valve, the third throttling element, the discharge line and the second valve constitute a gas cylinder charging and degassing subsystem for the engine;

[0025] The engine cylinder charging and discharging subsystem has a forward charging state in which the first valve is opened and the second valve is closed to supply helium to the hydrogen-oxygen engine; and a deflation state in which the first valve is closed and the second valve is opened to discharge helium through the discharge pipeline. Beneficial effects: The present application adopts the above technical solution to limit the charging rate through the third throttling element to avoid over-fast charging in the forward charging state, which causes the cylinder of the hydrogen-oxygen engine to heat up; and in the deflation state, there is no longer any restriction from the third throttling element, and helium can be quickly discharged from the hydrogen-oxygen engine, realizing a two-way dual-flow rate design, and improving the test efficiency while meeting the test state.

[0026] Optionally, the liquid hydrogen extrusion gas supply subsystem includes:

[0027] A first extrusion gas supply structure, adapted to provide a first extrusion gas;

[0028] a first pressure reducer connected to the first extruded gas supply structure;

[0029] a first step-by-step flow regulating unit connected to the first extrusion gas supply structure, the first step-by-step flow regulating unit being adapted to output the first extrusion gas in a step-by-step manner; the first step-by-step flow regulating unit being connected to a manual control console signal, the manual control console being adapted to manually control the flow of the first extrusion gas output by the first step-by-step flow regulating unit;

[0030] a second step-by-step flow regulating unit connected to the first pressure reducer, wherein the second step-by-step flow regulating unit is adapted to output the first extrusion gas in a step-by-step manner according to a time sequence;

[0031] The first flow continuous regulating unit is connected to the first pressure reducer, and the first flow continuous regulating unit is suitable for continuously regulating the flow of the first extrusion gas according to the timing; the first flow step regulating unit, the second flow step regulating unit, and the first flow continuous regulating unit are all connected to the input end of the liquid hydrogen tank, and the output end of the liquid hydrogen tank is connected to the liquid hydrogen inlet of the hydrogen-oxygen engine. Beneficial effect: The present application adopts the above technical solution, and the second flow step regulating unit and the first flow continuous regulating unit can complete the gas distribution work of the entire test process according to the timing through program control, and the first flow continuous regulating unit can make up for the pressure gradient difference caused by the step regulation of the second flow step unit, so that the gas supply is stable and reliable. In special circumstances, when the second flow step regulating unit, the first flow continuous regulating unit or the first pressure reducer fails, the first flow step regulating unit can be used to remotely manually supply gas through the manual console. Therefore, the first flow step regulating unit is a redundant design of program-controlled gas supply, which improves the gas supply reliability of the liquid hydrogen extrusion gas supply subsystem.

[0032] Optionally, the first flow step-by-step adjustment unit includes:

[0033] A plurality of first solenoid valves are all connected to the first extruded gas supply structure, and the plurality of first solenoid valves are all connected to the manual control console signal; the manual control console is suitable for manually controlling the connection or disconnection of the plurality of first solenoid valves;

[0034] A plurality of first throttling elements, one end of which is respectively connected to the plurality of first solenoid valves, and the other end of which is connected to the input end of the liquid hydrogen tank, and the plurality of first throttling elements are suitable for obtaining different throttling flow rates respectively;

[0035] The second flow step-by-step adjustment unit comprises:

[0036] A plurality of second solenoid valves are connected to the first extruded gas supply structure through the first pressure reducer; the plurality of second solenoid valves are suitable for being connected or disconnected according to a time sequence;

[0037] A plurality of second throttling elements, one end of which is respectively connected to the plurality of second solenoid valves, and the other end of which is connected to the input end of the liquid hydrogen tank, and the plurality of second throttling elements are suitable for obtaining different throttling flow rates respectively;

[0038] The first flow continuous adjustment unit comprises:

[0039] a first regulating valve connected to the first extruded gas supply structure through the first pressure reducer, the first regulating valve being adapted to continuously adjust the opening according to a time sequence;

[0040] The first remote control valve has one end connected to the first regulating valve, and the other end of the first remote control valve is connected to the input end of the liquid hydrogen tank; the first remote control valve is suitable for being connected or disconnected by remote control. Beneficial effect: The present application adopts the above technical solution, and more flow conditions can be achieved through continuous flow regulation of the first regulating valve.

[0041] Optionally, the liquid oxygen extrusion gas supply subsystem and the liquid hydrogen extrusion gas supply subsystem adopt a symmetrical structural setting. Beneficial effect: The present application adopts the above technical solution, and by adopting a symmetrical structural setting for the liquid oxygen extrusion gas supply subsystem and the liquid hydrogen extrusion gas supply subsystem, the relevant equipment and procedures of the liquid oxygen extrusion gas supply subsystem and the liquid hydrogen extrusion gas supply subsystem can have a certain degree of consistency, which is conducive to carrying out experimental work, and some equipment can also be interchangeable, and the number of spare parts required can be reduced, which is conducive to reducing costs.

[0042] Optionally, the liquid oxygen extrusion gas supply subsystem includes:

[0043] A second extrusion gas supply structure, adapted to provide a second extrusion gas;

[0044] a second pressure reducer connected to the second extruded gas supply structure;

[0045] a third step-by-step flow regulating unit connected to the second extrusion gas supply structure, the third step-by-step flow regulating unit being suitable for outputting the second extrusion gas in a step-by-step manner; the manual control console being signal-connected to the third step-by-step flow regulating unit, the manual control console being suitable for manually controlling the flow of the second extrusion gas output by the third step-by-step flow regulating unit;

[0046] a fourth step-by-step flow regulating unit connected to the second pressure reducer, the fourth step-by-step flow regulating unit being adapted to output the second extrusion gas in a step-by-step manner according to a time sequence;

[0047] The second flow continuous regulating unit is connected to the second pressure reducer, and the second flow continuous regulating unit is suitable for continuously regulating the flow of the second extrusion gas according to the timing; the third flow step regulating unit, the fourth flow step regulating unit, and the second flow continuous regulating unit are all connected to the input end of the liquid oxygen tank, and the output end of the liquid oxygen tank is connected to the liquid oxygen inlet of the hydrogen-oxygen engine. Beneficial effect: The present application adopts the above technical solution, and the fourth flow step regulating unit and the second flow continuous regulating unit can complete the gas distribution work of the entire test process according to the timing through program control, and the second flow continuous regulating unit can make up for the boost gradient difference caused by the step regulation of the fourth flow step unit, so that the gas supply is stable and reliable. In special circumstances, when the fourth flow step regulating unit, the second flow continuous regulating unit or the second pressure reducer fails, the third flow step regulating unit can be used to remotely manually supply gas through the manual console. Therefore, the third flow step regulating unit is a redundant design of program-controlled gas supply, which improves the gas supply reliability of the liquid oxygen extrusion gas supply subsystem.

[0048] Optionally, the engine helium supply module further comprises:

[0049] An airtightness and control gas supply pipeline, one end of which is connected to the first helium supply structure through a fourth pressure reducer;

[0050] The air supply valve box is provided with a plurality of valves in parallel, one end of the plurality of valves is connected to the other end of the air tightness and control air supply pipeline, and the other ends of the plurality of valves are respectively connected to different pipelines to be tested for air tightness or pipelines to be controlled for air supply in the hydrogen-oxygen engine; the air supply valve box is suitable for introducing helium into the corresponding pipelines to be tested for air tightness in the hydrogen-oxygen engine through the connection of different valves, so as to detect the air tightness of different pipelines in the hydrogen-oxygen engine in combination with a helium leak detector, and to introduce helium into the pipelines to be controlled for air supply in the hydrogen-oxygen engine through the connection of different valves. Beneficial effect: The present application adopts the above technical solution to conveniently and reliably check the air tightness of the pipelines of the hydrogen-oxygen engine and control the air supply of the hydrogen-oxygen engine.

[0051] Optionally, it also includes:

[0052] One end of a plurality of parallel air-sealing pipelines is connected to a gas source through a pressure reducer, and the other end of the plurality of air-sealing pipelines is connected to a pipeline to be air-sealed; the gas source is a first extruded gas supply structure, a second extruded gas supply structure and / or a first helium supply structure. Beneficial effect: The present application adopts the above technical solution to perform gas sealing on the pipeline to be air-sealed through the air-sealing pipeline, thereby preventing atmospheric gas from entering the pipeline to be air-sealed and causing air to mix into the pipeline to be air-sealed.

[0053] Optionally, it also includes:

[0054] The second nitrogen supply structure is suitable for providing nitrogen; the outlet of the first extrusion gas supply structure is connected to a second gas source supply switch, the outlet of the second gas source supply switch is connected to one end of the first gas source supply switch, and the second nitrogen supply structure is connected to the other end of the first gas source supply switch through a gas source conversion switch; a deflation hand valve is provided on the pipeline connected between the first gas source supply switch and the gas source conversion switch; the hydrogen-oxygen engine test gas distribution system has the following features: before the liquid hydrogen extrusion gas supply subsystem provides the first extrusion gas to the liquid hydrogen tank, the second gas source supply switch is closed, the first gas source supply switch and the gas source conversion switch are opened, and nitrogen is provided by the second nitrogen supply structure to achieve a replacement state in which nitrogen replaces the air in the pipeline of the liquid hydrogen extrusion gas supply subsystem; and after achieving nitrogen replacement of the air in the pipeline of the liquid hydrogen extrusion gas supply subsystem, the first gas source supply switch and the gas source conversion switch are first closed, the deflation hand valve is opened, and then the second gas source supply switch is opened, and the liquid hydrogen extrusion gas supply subsystem provides the first extrusion gas to the liquid hydrogen tank.

[0055] A plurality of control gas supply pipelines, one end of which is connected to the second nitrogen supply structure through a pressure reducer;

[0056] A plurality of control valve boxes are respectively connected to a plurality of control gas supply pipelines, and the control valve boxes are respectively connected to the control ends of a plurality of pneumatic valves through a plurality of solenoid valves suitable for remote control; the control valve boxes are suitable for inputting nitrogen to the control ends of the corresponding pneumatic valves when the remote control solenoid valves are opened, and for opening the corresponding pneumatic valves, and for not inputting nitrogen to the control ends of the corresponding pneumatic valves when the remote control solenoid valves are closed, and for closing the corresponding pneumatic valves;

[0057] The fire-fighting pipeline is connected to the second nitrogen supply structure, and the fire-fighting pipeline is suitable for releasing nitrogen to isolate oxygen in the air for fire-fighting. Beneficial effect: The present application adopts the above-mentioned technical scheme. Before the liquid hydrogen extrusion gas supply subsystem provides the first extrusion gas to the liquid hydrogen storage tank, by closing the second gas source supply switch, opening the first gas source supply switch and the gas source conversion switch, the air in the pipeline of the liquid hydrogen extrusion gas supply subsystem is first replaced with nitrogen to avoid direct use of the first extrusion gas, which brings safety risks; and by closing the first gas source supply switch and the gas source conversion switch, and opening the gas release manual valve, the pipeline between the first gas source supply switch and the gas source conversion switch is emptied, which can achieve effective isolation of the first extrusion gas and nitrogen, avoid mutual contamination between nitrogen and the first extrusion gas, and cause safety hazards; and by setting up the fire-fighting pipeline, the safety of the test site is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] 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.

[0059] Figure 1 A schematic diagram of the connection of a hydrogen-oxygen engine test gas distribution system provided in an embodiment of the present invention;

[0060] Figure 2 A partial connection schematic diagram of a liquid hydrogen extrusion gas supply subsystem provided in an embodiment of the present invention;

[0061] Figure 3 A partial connection diagram of an auxiliary gas supply subsystem provided in an embodiment of the present invention;

[0062] Figure 4 A connection diagram of an engine cylinder charging and discharging subsystem provided in an embodiment of the present invention;

[0063] Figure 5 It is a partial connection schematic diagram of the liquid oxygen extrusion gas supply subsystem provided in an embodiment of the present invention.

[0064] Description of reference numerals:

[0065] 1. The first nitrogen supply structure; 2. Liquid hydrogen extrusion gas supply subsystem; 3. Auxiliary gas supply subsystem; 4. Engine gas cylinder charging and discharging subsystem; 5. Gas supply valve box; 6. Liquid oxygen storage tank; 7. Liquid oxygen extrusion gas supply subsystem; 8. The first gas sealing pipeline; 9. Hydrogen-oxygen engine; 10. The second extrusion gas supply structure; 11. Liquid hydrogen storage tank; 12. Control valve box; 13. Control gas supply pipeline; 14. The second gas sealing pipeline; 15. The first helium supply structure; 16. Air tightness and control gas supply pipeline; 17. The first throttling element; 18. The first valve; 19. The discharge pipeline; 20. The gas source conversion switch; 21. The deflation hand valve; 22. The first gas source supply switch; 23. The first extrusion gas supply structure; 24. The second gas source supply switch; 25. The second valve; 26. The first solenoid valve; 27. Second throttling element; 28. Fire fighting pipeline; 29. ​​First regulating valve; 30. First remote control valve; 31. Third throttling element; 32. Second solenoid valve; 33. Third solenoid valve; 34. Fourth solenoid valve; 35. Fourth throttling element; 36. First pressure reducer; 37. Second nitrogen supply structure; 38. Second helium supply structure; 39. Second remote control valve; 40. Second pressure reducer; 41. First nitrogen supply pipeline; 42. Heater; 43. Second nitrogen supply pipeline; 44. Fifth throttling element; 45. Second regulating valve; 46. Third gas source supply switch; 47. Third valve; 48. Fourth valve; 49. Fifth valve; 50. Third pressure reducer; 51. Fourth pressure reducer; 52. Fifth pressure reducer; 53. First check valve; 54. Second check valve. DETAILED DESCRIPTION

[0066] 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.

[0067] like Figures 1 to 5 A specific embodiment of the hydrogen-oxygen engine test gas distribution system shown includes: a liquid hydrogen extrusion gas supply subsystem 2, a liquid oxygen extrusion gas supply subsystem 7, an engine helium supply module, an engine nitrogen supply module, a plurality of parallel gas sealing pipelines, a second nitrogen supply structure 37, a plurality of control gas supply pipelines 13, a plurality of control valve boxes 12 and a fire protection pipeline 28.

[0068] like Figure 1 and Figure 2As shown, the liquid hydrogen extrusion gas supply subsystem 2 includes: a first extrusion gas supply structure 23, a first pressure reducer 36, a first flow step-by-step adjustment unit, a second flow step-by-step adjustment unit and a first flow continuous adjustment unit. The liquid hydrogen extrusion gas supply subsystem 2 is connected to the liquid hydrogen tank 11, and the liquid hydrogen extrusion gas supply subsystem 2 is suitable for providing the first extrusion gas to the liquid hydrogen tank 11, so as to extrude the liquid hydrogen propellant in the liquid hydrogen tank 11 into the liquid hydrogen pipeline of the hydrogen-oxygen engine 9. The first extrusion gas supply structure 23 is suitable for providing the first extrusion gas, and the first extrusion gas is hydrogen. The first extrusion gas supply structure 23 can be a hydrogen bottle.

[0069] The first pressure reducer 36 is connected to the first extruded gas supply structure 23. The first flow step-adjusting unit is connected to the first extruded gas supply structure 23, and the first flow step-adjusting unit is suitable for outputting hydrogen in steps. The first flow step-adjusting unit is connected to the manual control console signal, and the manual control console is suitable for manually controlling the flow of hydrogen output by the first flow step-adjusting unit. The manual control console is generally placed in the control room, and the flow of hydrogen output by the first flow step-adjusting unit is controlled by remote manual control. The second flow step-adjusting unit is connected to the first pressure reducer 36, and the second flow step-adjusting unit is suitable for outputting hydrogen in steps according to the timing. According to the timing means that the gas supply flow in different test stages is controlled by the program module according to the process test steps of the hydrogen-oxygen engine 9. The first flow continuous adjustment unit is connected to the first pressure reducer 36, and the first flow continuous adjustment unit is suitable for continuously adjusting the flow of output hydrogen according to the timing. The first flow step-adjusting unit, the second flow step-adjusting unit, and the first flow continuous adjusting unit are all connected to the input end of the liquid hydrogen tank 11 , and the output end of the liquid hydrogen tank 11 is connected to the liquid hydrogen inlet of the hydrogen-oxygen engine 9 .

[0070] Specifically, the first flow step-by-step regulating unit includes: a plurality of first solenoid valves 26 and a plurality of first throttling elements 17. The plurality of first solenoid valves 26 are all connected to the first extruded gas supply structure 23, and the plurality of first solenoid valves 26 are all connected to the manual control console signal; the manual control console is suitable for manually controlling the connection or disconnection of the plurality of first solenoid valves 26. One end of the plurality of first throttling elements 17 is respectively connected to the plurality of first solenoid valves 26, and the other end of the plurality of first throttling elements 17 is connected to the input end of the liquid hydrogen tank 11. The plurality of first throttling elements 17 are suitable for obtaining different throttling flow rates respectively. By connecting or disconnecting different first solenoid valves 26, different first throttling elements 17 can form a variety of combined flow rates to meet the test requirements.

[0071] Specifically, Figure 2As shown, the second flow step-by-step regulating unit includes: a plurality of second solenoid valves 32 and a plurality of second throttling elements 27. The plurality of second solenoid valves 32 are connected to the first extruded gas supply structure 23 through the first pressure reducer 36; the plurality of second solenoid valves 32 are suitable for being connected or disconnected according to a timing sequence. One end of the plurality of second throttling elements 27 is respectively connected to the plurality of second solenoid valves 32, and the other end of the plurality of second throttling elements 27 is connected to the input end of the liquid hydrogen tank 11. The plurality of second throttling elements 27 are suitable for obtaining different throttling flow rates respectively. By connecting or disconnecting different second solenoid valves 32, different second throttling elements 27 can form a variety of combined flow rates to meet the test requirements.

[0072] Specifically, Figure 2 As shown, the first flow continuous regulation unit includes: a first regulating valve 29 and a first remote control valve 30. The first regulating valve 29 is connected to the first extrusion gas supply structure 23 through the first pressure reducer 36, and the first regulating valve 29 is suitable for continuously adjusting the opening according to the timing. One end of the first remote control valve 30 is connected to the first regulating valve 29, and the other end of the first remote control valve 30 is connected to the input end of the liquid hydrogen tank 11; the first remote control valve 30 is suitable for being remotely controlled to be connected or disconnected. In the test phase, the liquid hydrogen extrusion gas supply subsystem 2 of the present application uses a program to control the second flow step regulation unit and the first flow continuous regulation unit to meet the test start-up stage and the instant gas supply flow regulation under various working conditions; when the first pressure reducer 36 fails, the program regulation means cannot meet the test requirements, and the first flow step regulation unit can be urgently activated to supplement the test demand for the first extrusion gas. The first flow step regulation unit is a redundant means when the first pressure reducer 36 is in a failure mode, which can improve the reliability of the liquid hydrogen extrusion gas supply subsystem 2. The second flow step-by-step regulating unit quickly responds to various flow demands through a plurality of second solenoid valves 32 , and the first flow continuous regulating unit is a supplement to the second flow step-by-step regulating unit.

[0073] like Figure 1 and Figure 5 As shown, the liquid oxygen extrusion gas supply subsystem 7 is connected to the liquid oxygen tank 6, and the liquid oxygen extrusion gas supply subsystem 7 is suitable for providing the second extrusion gas to the liquid oxygen tank 6, so as to extrude the liquid oxygen propellant in the liquid oxygen tank 6 into the liquid oxygen pipeline of the hydrogen-oxygen engine 9; the liquid hydrogen pipeline and the liquid oxygen pipeline are collectively referred to as the propellant pipeline, and the propellant pipeline belongs to the inner cavity pipeline. The second extrusion gas is nitrogen. The liquid oxygen extrusion gas supply subsystem 7 and the liquid hydrogen extrusion gas supply subsystem 2 adopt a symmetrical structural setting. The present application adopts the above-mentioned symmetrical structural setting, which is conducive to the writing of the control program, has good operational consistency, and the liquid oxygen extrusion gas supply subsystem 7 and the liquid hydrogen extrusion gas supply subsystem 2 have good equipment interchangeability.

[0074] like Figure 5 As shown, the liquid oxygen extrusion gas supply subsystem 7 includes: a second extrusion gas supply structure 10, a second pressure reducer 40, a third flow step-by-step regulating unit, a fourth flow step-by-step regulating unit and a second flow continuous regulating unit.

[0075] The second extruded gas supply structure 10 is suitable for providing nitrogen, and the second extruded gas supply structure 10 can be a nitrogen bottle. The second pressure reducer 40 is connected to the second extruded gas supply structure 10. The third flow step-by-step regulating unit is connected to the second extruded gas supply structure 10, and the third flow step-by-step regulating unit is suitable for step-by-step output of nitrogen; the manual control console is signal-connected to the third flow step-by-step regulating unit, and the manual control console is suitable for manually controlling the flow of nitrogen output by the third flow step-by-step regulating unit. The fourth flow step-by-step regulating unit is connected to the second pressure reducer 40, and the fourth flow step-by-step regulating unit is suitable for step-by-step output of nitrogen according to a time sequence. The second flow continuous regulating unit is connected to the second pressure reducer 40, and the second flow continuous regulating unit is suitable for continuously regulating the flow of output nitrogen according to a time sequence. The third flow step-by-step regulating unit, the fourth flow step-by-step regulating unit, and the second flow continuous regulating unit are all connected to the input end of the liquid oxygen tank 6, and the output end of the liquid oxygen tank 6 is connected to the liquid oxygen inlet of the hydrogen-oxygen engine 9.

[0076] Specifically, Figure 5 As shown, a third gas source supply switch 46 is connected to the outlet of the second extruded gas supply structure 10 to control whether the second extruded gas supply structure 10 delivers nitrogen to the outside. The third flow step-by-step regulating unit includes: a plurality of third solenoid valves 33 and a plurality of fourth throttling elements 35. The plurality of third solenoid valves 33 are all connected to the second extruded gas supply structure 10, and the plurality of third solenoid valves 33 are all connected to the manual control console signal; the manual control console is suitable for manually controlling the connection or disconnection of the plurality of third solenoid valves 33. One end of the plurality of fourth throttling elements 35 is respectively connected to the plurality of third solenoid valves 33, and the other end of the plurality of fourth throttling elements 35 is connected to the input end of the liquid oxygen storage tank 6, and the plurality of fourth throttling elements 35 are suitable for obtaining different throttling flow rates respectively.

[0077] Specifically, Figure 5 As shown, the fourth flow step-by-step regulating unit includes: a plurality of fourth solenoid valves 34 and a plurality of fifth throttling elements 44. The plurality of fourth solenoid valves 34 are connected to the second extruded gas supply structure 10 through the second pressure reducer 40; the plurality of fourth solenoid valves 34 are suitable for being connected or disconnected according to a time sequence. One end of the plurality of fifth throttling elements 44 is respectively connected to the plurality of fourth solenoid valves 34, and the other end of the plurality of fifth throttling elements 44 is connected to the input end of the liquid oxygen tank 6, and the plurality of fifth throttling elements 44 are suitable for obtaining different throttling flow rates respectively.

[0078] Specifically, Figure 5 As shown, the second flow continuous regulation unit includes: a second regulating valve 45 and a second remote control valve 39. The second regulating valve 45 is connected to the second extrusion gas supply structure 10 through the second pressure reducer 40, and the second regulating valve 45 is suitable for continuously adjusting the opening according to the timing. One end of the second remote control valve 39 is connected to the second regulating valve 45, and the other end of the second remote control valve 39 is connected to the input end of the liquid oxygen tank 6; the second remote control valve 39 is suitable for being remotely controlled to be connected or disconnected. In the test phase, the liquid oxygen extrusion gas supply subsystem 7 of the present application uses a program to control the fourth flow step regulation unit and the second flow continuous regulation unit to meet the test start-up phase and the instant gas supply flow regulation under various working conditions; when the second pressure reducer 40 fails, the program regulation means cannot meet the test requirements, and the third flow step regulation unit can be urgently activated to supplement the test demand for the second extrusion gas. The third flow step regulation unit is a redundant means when the second pressure reducer 40 is in a failure mode, which can improve the reliability of the liquid oxygen extrusion gas supply subsystem 7. The fourth step-by-step flow regulating unit quickly responds to various flow demands through a plurality of fourth solenoid valves 34 , and the second continuous flow regulating unit is a supplement to the fourth step-by-step flow regulating unit.

[0079] like Figure 1 and Figure 3 As shown, the engine helium supply module is connected to the hydrogen-oxygen engine 9 through a third valve 47. The engine helium supply module has a first state in which the engine is connected to the purge gas interface of the hydrogen-oxygen engine 9 before the test of the hydrogen-oxygen engine 9 to provide helium to the hydrogen-oxygen engine 9 to exhaust the nitrogen in the inner cavity pipeline, and a second state in which the engine is connected to the purge gas interface of the hydrogen-oxygen engine 9 during the test of the hydrogen-oxygen engine 9 to provide helium as a purge gas to the hydrogen-oxygen engine 9; and a third state in which the engine is connected to the purge gas interface of the hydrogen-oxygen engine 9 when the temperature is restored after the test of the hydrogen-oxygen engine 9, and the temperature of the hydrogen-oxygen engine 9 is in the temperature range of liquid hydrogen, and helium is provided to purge and reheat the hydrogen-oxygen engine 9 with helium. In the third state, the liquefaction point temperature of the helium is: -268.93°C, which is lower than the liquefaction point temperature of liquid hydrogen: -253°C; the helium is in a gaseous state and can be used for purge. The temperature range of liquid hydrogen refers to the temperature range of liquid hydrogen below -253°C. In the temperature range of liquid hydrogen, nitrogen is in liquid state and cannot be used for blowing and rewarming.

[0080] The engine nitrogen supply module has a fourth state in which, before the hydrogen-oxygen engine 9 is tested, the engine is connected to the purge gas interface of the hydrogen-oxygen engine 9 through the fourth valve 48 to provide nitrogen to the hydrogen-oxygen engine 9 to exhaust the air in the inner cavity pipeline, and a fifth state in which, when the temperature of the hydrogen-oxygen engine 9 is restored after the test, the engine is connected to the purge gas interface of the hydrogen-oxygen engine 9 through the fifth valve 49, and when the temperature of the hydrogen-oxygen engine 9 is higher than the temperature range of liquid nitrogen, the engine is provided with heated nitrogen to purge and rewarm the hydrogen-oxygen engine 9 with heated nitrogen. In the fifth state, the liquefaction point temperature of the nitrogen is -196°C, the temperature of the hydrogen-oxygen engine 9 after the test is higher than -196°C, the nitrogen is in a gaseous state, and can be used for purge and rewarming to save helium. The temperature range of the liquid nitrogen is the temperature range of gaseous nitrogen higher than -196°C. In addition, the hydrogen-oxygen engine test gas distribution system is suitable for, before the hydrogen-oxygen engine 9 is tested, first closing the third valve 47 and the fifth valve 49, opening the fourth valve 48, so that the engine nitrogen supply module is in the fourth state, and then discharging the nitrogen filled in the inner cavity pipeline and the remaining air, and repeating the process of filling and discharging nitrogen into the inner cavity pipeline for many times until the inner cavity pipeline meets the dew point requirements of the propellant, and the nitrogen in the inner cavity pipeline is discharged; then, opening the third valve 47, closing the fourth valve 48 and the fifth valve 49, so that the engine helium supply module is in the first state , and then discharge the helium and the remaining nitrogen filled in the inner cavity pipeline, and repeat the process of filling and discharging helium into the inner cavity pipeline for many times until the inner cavity pipeline meets the requirements of oxygen and nitrogen composition of the propellant; and after the hydrogen-oxygen engine 9 is tested, first open the third valve 47, close the fourth valve 48 and the fifth valve 49, so that the engine helium supply module is in the third state, and then, when the temperature of the hydrogen-oxygen engine 9 is higher than the temperature range of liquid nitrogen, close the third valve 47 and the fourth valve 48, open the fifth valve 49, so that the engine nitrogen supply module is in the fifth state. The above-mentioned propellants refer to liquid hydrogen propellant and liquid oxygen propellant. The above-mentioned operation of emptying the air in the inner cavity pipeline is because the propellant is generally in a low temperature state and cannot directly contact the air in the inner cavity pipeline. The dew point requirement refers to: the requirements of the inner cavity pipeline for dew point according to the standards of the hydrogen-oxygen engine test, that is, the requirements of the inner cavity pipeline for water content; the requirements of oxygen and nitrogen composition refer to: the requirements of the inner cavity pipeline for oxygen and nitrogen composition according to the standards of the hydrogen-oxygen engine test. During each of the above-mentioned nitrogen discharge processes, the discharge into the inner cavity pipeline is in a slightly positive pressure state; during each of the above-mentioned helium discharge processes, the discharge into the inner cavity pipeline is in a slightly positive pressure state.

[0081] Specifically, Figure 3As shown, the engine helium supply module includes: a first helium supply structure 15, a fifth pressure reducer 52, an engine cylinder gas filling and discharging subsystem 4, an airtightness and control gas supply pipeline 16 and a gas supply valve box 5. The first helium supply structure 15 is suitable for providing helium. One end of the fifth pressure reducer 52 is connected to the first helium supply structure 15; the other end of the fifth pressure reducer 52 is connected to the hydrogen-oxygen engine 9 through a third valve 47. The engine helium supply module except the engine cylinder gas filling and discharging subsystem 4 and the gas supply valve box 5 and the engine nitrogen supply module constitute an auxiliary gas supply subsystem 3.

[0082] like Figure 1 and Figure 3 As shown, one end of the air tightness and control air supply pipeline 16 is connected to the first helium supply structure 15 through a fourth pressure reducer 51. The air supply valve box 5 is provided with a plurality of valves in parallel, one end of the plurality of valves is connected to the other end of the air tightness and control air supply pipeline 16, and the other ends of the plurality of valves are respectively connected to different pipelines to be tested for air tightness or pipelines to be controlled for air supply in the hydrogen-oxygen engine 9; the air supply valve box 5 is suitable for introducing helium into the corresponding pipelines to be tested for air tightness in the hydrogen-oxygen engine 9 through the connection of different valves, so as to detect the air tightness of different pipelines in the hydrogen-oxygen engine 9 in combination with a helium leak detector, and to introduce helium into the pipelines to be controlled for air supply in the hydrogen-oxygen engine 9 through the connection of different valves.

[0083] like Figure 1 and Figure 4 As shown, the engine cylinder filling and discharging subsystem 4 includes: a second helium supply structure 38, a first valve 18, a third throttling element 31, a discharge pipeline 19 and a second valve 25. The second helium supply structure 38 is suitable for providing helium, and the second helium supply structure 38 can be a high-pressure helium cylinder. One end of the first valve 18 is connected to one end of the second helium supply structure 38. One end of the third throttling element 31 is connected to the other end of the first valve 18, and the other end of the third throttling element 31 is connected to the cylinder charging interface of the hydrogen-oxygen engine 9; the third throttling element 31 is suitable for reducing the flow rate of helium. The discharge pipeline 19 is connected to the pipeline between the third throttling element 31 and the cylinder charging interface of the hydrogen-oxygen engine 9. The second valve 25 is arranged on the discharge pipeline 19. The engine cylinder charging and discharging subsystem 4 has a positive charging state in which the first valve 18 is opened and the second valve 25 is closed to supply helium to the hydrogen-oxygen engine 9; and a deflation state in which the first valve 18 is closed and the second valve 25 is opened to discharge helium through the discharge pipeline 19. The selection and setting of the connection position of the third throttling element 31 in the present application enables the charging and discharging process to achieve a two-way dual-flow rate function.

[0084] Specifically, Figure 3 As shown, the engine nitrogen supply module includes: a first nitrogen supply structure 1 , a third pressure reducer 50 , a first nitrogen supply pipeline 41 and a second nitrogen supply pipeline 43 .

[0085] The first nitrogen supply structure 1 is suitable for providing nitrogen, and the first nitrogen supply structure 1 can be a nitrogen bottle to provide nitrogen at room temperature. One end of the first nitrogen supply pipeline 41 is connected to the other end of the third pressure reducer 50 through the fourth valve 48, and the other end of the first nitrogen supply pipeline 41 is connected to the hydrogen-oxygen engine 9. One end of the second nitrogen supply pipeline 43 is connected to the other end of the third pressure reducer 50, and the other end of the second nitrogen supply pipeline 43 is connected to the hydrogen-oxygen engine 9 through the fifth valve 49; and a heater 42 is provided on the second nitrogen supply pipeline 43, and the heater 42 is suitable for heating nitrogen. The pipeline between the first nitrogen supply pipeline 41 and the hydrogen-oxygen engine 9 and the pipeline between the third valve 47 and the hydrogen-oxygen engine 9 can share a pipeline to reduce costs. In the case of the above-mentioned shared pipeline, a second check valve 54 must be set on the pipeline before the first nitrogen supply pipeline 41 merges into the shared pipeline, and a first check valve 53 must be set on the pipeline before the pipeline involving the first helium supply structure 15 providing helium merges into the shared pipeline. Specifically, the first check valve 53 can be set after the third valve 47. The above-mentioned settings are made in this application to avoid direct mutual penetration between helium and nitrogen, causing pollution. The third valve 47 is opened, the fourth valve 48 and the fifth valve 49 are closed, and the first helium supply structure 15 provides helium to the hydrogen-oxygen engine 9, which can be used in the first state, the second state and the third state; the third valve 47 is closed, the fourth valve 48 is opened and the fifth valve 49 is closed, and the first nitrogen supply structure 1 provides normal temperature nitrogen to the hydrogen-oxygen engine 9, which can be used in the fourth state; the third valve 47 is closed, the fourth valve 48 is closed and the fifth valve 49 is opened, and the first nitrogen supply structure 1 provides heated nitrogen to the hydrogen-oxygen engine 9, which can be used in the fifth state. The third valve 47, the fourth valve 48 and the fifth valve 49 can all be solenoid valves.

[0086] like Figure 1As shown, one end of a plurality of parallel air-sealing pipelines is connected to the gas source through a pressure reducer, and the other end of the plurality of air-sealing pipelines is connected to the pipeline to be air-sealed; the gas source is the first extruded gas supply structure 23, the second extruded gas supply structure 10 and / or the first helium supply structure 15. When the pipeline to be air-sealed is the discharge port of the propellant pipeline, the gas source continuously supplies air-sealing gas, so that the discharge port of the propellant pipeline can continuously discharge air-sealing gas, thereby preventing air from entering the propellant pipeline during the process of stopping the discharge of the propellant, which has an adverse effect on the propellant pipeline. Since there is generally flammable gas in the propellant pipeline or the propellant pipeline is a low-temperature pipeline, the adverse effects include: ice in the propellant pipeline or the formation of an explosive mixture of air and flammable gas. The number of air-sealing pipelines is based on the demand for the number of air seals for the pipeline to be air-sealed, and a certain number of air-sealing pipelines can be appropriately reserved. Specifically, a plurality of parallel first air-sealing pipelines 8 are connected to the first extruded gas supply structure 23 through a pressure reducer, and the hydrogen of the first extruded gas supply structure 23 is generally used to air-seal the liquid hydrogen discharge pipeline. A plurality of parallel second air-sealing pipelines 14 are connected to the second extruded gas supply structure 10, and the nitrogen of the second extruded gas supply structure 10 is generally used to air-seal the liquid oxygen discharge pipeline. A plurality of parallel third air-sealing pipelines are connected to the first helium supply structure 15, and the helium of the first helium supply structure 15 is generally used to air-seal the liquid hydrogen or hydrogen discharge pipeline. The principle of air sealing can be briefly described as introducing an air-sealing pipeline into a pipeline close to the gas outlet of other systems, and when the air-sealing pipeline discharges gas to the gas outlet, it prevents air containing moisture and oxygen from entering other systems through the gas outlet.

[0087] like Figure 1 As shown, the second nitrogen supply structure 37 is suitable for providing nitrogen, and the second nitrogen supply structure 37 can be a nitrogen bottle; Figure 2As shown, the outlet of the first extrusion gas supply structure 23 is connected to a second gas source supply switch 24 to control whether the first extrusion gas supply structure 23 delivers hydrogen to the outside. The outlet of the second gas source supply switch 24 is connected to one end of the first gas source supply switch 22, and the second nitrogen supply structure 37 is connected to the other end of the first gas source supply switch 22 through the gas source conversion switch 20; a venting hand valve 21 is provided on the pipeline connecting the first gas source supply switch 22 and the gas source conversion switch 20; the hydrogen-oxygen engine test gas distribution system has the function of closing the second gas source supply switch 24 and opening the second gas source supply switch 21 before the liquid hydrogen extrusion gas supply subsystem 2 provides the first extrusion gas to the liquid hydrogen tank 11. A gas source supply switch 22 and a gas source conversion switch 20, nitrogen is provided by a second nitrogen supply structure 37 to achieve a replacement state in which nitrogen replaces the air in the pipeline of the liquid hydrogen extrusion gas supply subsystem 2; and after the nitrogen replaces the air in the pipeline of the liquid hydrogen extrusion gas supply subsystem 2, the first gas source supply switch 22 and the gas source conversion switch 20 are first closed, and then the gas release manual valve 21 is opened, and then the second gas source supply switch 24 is opened, and the liquid hydrogen extrusion gas supply subsystem 2 provides the liquid hydrogen storage tank 11 with the first extrusion gas hydrogen supply state. Before the liquid hydrogen extrusion gas supply subsystem 2 provides hydrogen to the liquid hydrogen tank 11, the present application replaces the air in the pipeline of the liquid hydrogen extrusion gas supply subsystem 2 with nitrogen to avoid direct use of hydrogen and bring safety risks; and by closing the first gas source supply switch 22 and the gas source conversion switch 20, and opening the gas release manual valve 21, the pipeline between the first gas source supply switch 22 and the gas source conversion switch 20 is emptied, which can effectively isolate hydrogen and nitrogen, avoid nitrogen and hydrogen from contaminating each other, and cause safety hazards. One end of the multiple control gas supply pipelines 13 is connected to the second nitrogen supply structure 37 through a pressure reducer. The plurality of control valve boxes 12 are respectively connected to the plurality of control gas supply pipelines 13, and the control valve boxes 12 are respectively connected to the control ends of the plurality of pneumatic valves through the plurality of solenoid valves suitable for remote control; the control valve box 12 is suitable for inputting nitrogen to the control end of the corresponding pneumatic valve when the remote control solenoid valve is opened, and opening the corresponding pneumatic valve, and when the remote control solenoid valve is closed, nitrogen is not input to the control end of the corresponding pneumatic valve, and the corresponding pneumatic valve is closed. The fire-fighting pipeline 28 is connected to the second nitrogen supply structure 37, and the fire-fighting pipeline 28 is suitable for releasing nitrogen to isolate oxygen in the air for fire-fighting.

[0088] 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 hydrogen-oxygen engine test gas distribution system, characterized in that: include: A liquid hydrogen extrusion gas supply subsystem (2) is connected to the liquid hydrogen tank (11), and the liquid hydrogen extrusion gas supply subsystem (2) is suitable for providing a first extrusion gas to the liquid hydrogen tank (11), thereby extruding the liquid hydrogen propellant in the liquid hydrogen tank (11) into the liquid hydrogen pipeline of the hydrogen-oxygen engine (9); A liquid oxygen extrusion gas supply subsystem (7) is connected to the liquid oxygen tank (6), and the liquid oxygen extrusion gas supply subsystem (7) is suitable for providing a second extrusion gas to the liquid oxygen tank (6), thereby extruding the liquid oxygen propellant in the liquid oxygen tank (6) into the liquid oxygen pipeline of the hydrogen-oxygen engine (9); the liquid hydrogen pipeline and the liquid oxygen pipeline are collectively referred to as the propellant pipeline, and the propellant pipeline belongs to the inner cavity pipeline; The engine helium supply module is connected to the hydrogen-oxygen engine (9) via a third valve (47). The engine helium supply module has a first state in which, before the hydrogen-oxygen engine (9) is tested, the module is connected to a purge gas interface of the hydrogen-oxygen engine (9) to provide helium to the hydrogen-oxygen engine (9) to exhaust nitrogen in the inner cavity pipeline; and a second state in which, during the hydrogen-oxygen engine (9) test, the module is connected to the purge gas interface of the hydrogen-oxygen engine (9) to provide helium as purge gas to the hydrogen-oxygen engine (9); and a third state in which, when the temperature of the hydrogen-oxygen engine (9) is restored after the test, the module is connected to the purge gas interface of the hydrogen-oxygen engine (9) and the temperature of the hydrogen-oxygen engine (9) is lower than the liquefaction point temperature of hydrogen, the module provides helium to purge and reheat the hydrogen-oxygen engine (9) using helium; The engine nitrogen supply module has a fourth state in which, before the hydrogen-oxygen engine (9) is tested, the module is connected to the purge gas interface of the hydrogen-oxygen engine (9) through a fourth valve (48) to supply nitrogen to the hydrogen-oxygen engine (9) to exhaust the air in the inner cavity pipeline; and a fifth state in which, when the temperature of the hydrogen-oxygen engine (9) is restored after the test, the module is connected to the purge gas interface of the hydrogen-oxygen engine (9) through a fifth valve (49) and when the temperature of the hydrogen-oxygen engine (9) is higher than the liquefaction point of nitrogen, the module provides heated nitrogen to purge and restore the temperature of the hydrogen-oxygen engine (9) using the heated nitrogen; The hydrogen-oxygen engine test gas distribution system is suitable for, before the hydrogen-oxygen engine (9) is tested, first closing the third valve (47) and the fifth valve (49), opening the fourth valve (48), so that the engine nitrogen supply module is in the fourth state, then discharging the nitrogen filled in the inner cavity pipeline and the remaining air, and repeatedly filling the inner cavity pipeline with nitrogen and discharging nitrogen until the inner cavity pipeline meets the dew point requirements of the propellant, and the nitrogen in the inner cavity pipeline is discharged; then, opening the third valve (47), closing the fourth valve (48) and the fifth valve (49), so that the engine helium supply module is in the first state, and then The helium gas filled into the inner cavity pipeline and the remaining nitrogen gas are discharged, and the process of filling and discharging helium gas into the inner cavity pipeline is repeated multiple times until the inner cavity pipeline meets the oxygen and nitrogen composition requirements of the propellant; and after the hydrogen-oxygen engine (9) is tested, the third valve (47) is first opened, and the fourth valve (48) and the fifth valve (49) are closed, so that the engine helium supply module is in the third state; then, when the temperature of the hydrogen-oxygen engine (9) is higher than the liquefaction point temperature of nitrogen, the third valve (47) and the fourth valve (48) are closed, and the fifth valve (49) is opened, so that the engine nitrogen supply module is in the fifth state.

2. The hydrogen-oxygen engine test gas distribution system according to claim 1, characterized in that: The engine helium supply module comprises: A first helium supply structure (15), adapted to provide helium; a fifth pressure reducer (52), one end of which is connected to the first helium supply structure (15); the other end of the fifth pressure reducer (52) is connected to the hydrogen-oxygen engine (9) via a third valve (47); The engine nitrogen supply module comprises: A first nitrogen supply structure (1), adapted to provide nitrogen; a third pressure reducer (50), one end of which is connected to the first nitrogen supply structure (1); a first nitrogen supply pipeline (41), one end of which is connected to the other end of the third pressure reducer (50) via a fourth valve (48), and the other end of the first nitrogen supply pipeline (41) is connected to the hydrogen-oxygen engine (9); One end of a second nitrogen supply pipeline (43) is connected to the other end of the third pressure reducer (50), and the other end of the second nitrogen supply pipeline (43) is connected to the hydrogen-oxygen engine (9) via a fifth valve (49); and a heater (42) is provided on the second nitrogen supply pipeline (43), and the heater (42) is suitable for heating the nitrogen.

3. The hydrogen-oxygen engine test gas distribution system according to claim 2, characterized in that: The engine helium supply module also includes: A second helium supply structure (38) adapted to provide helium; A first valve (18), one end of which is connected to one end of the second helium supply structure (38); a third throttling element (31), one end of which is connected to the other end of the first valve (18), and the other end of the third throttling element (31) is connected to the gas cylinder charging interface of the hydrogen-oxygen engine (9); the third throttling element (31) is suitable for reducing the flow rate of helium; An exhaust pipeline (19) connected to the pipeline between the third throttling element (31) and the gas cylinder charging interface of the hydrogen-oxygen engine (9); a second valve (25) disposed on the discharge pipeline (19); The second helium supply structure (38), the first valve (18), the third throttling element (31), the discharge pipeline (19) and the second valve (25) constitute an engine cylinder filling and discharging subsystem (4); The engine cylinder filling and discharging subsystem (4) has a positive filling state in which the first valve (18) is opened and the second valve (25) is closed to supply helium to the hydrogen-oxygen engine (9); and a deflation state in which the first valve (18) is closed and the second valve (25) is opened to discharge the helium through the discharge pipeline (19).

4. The hydrogen-oxygen engine test gas distribution system according to claim 3, characterized in that: The liquid hydrogen extrusion gas supply subsystem (2) comprises: A first extrusion gas supply structure (23), adapted to provide first extrusion gas; a first pressure reducer (36) connected to the first extrusion gas supply structure (23); a first step-by-step flow regulating unit connected to the first extrusion gas supply structure (23), the first step-by-step flow regulating unit being adapted to output the first extrusion gas in a step-by-step manner; the first step-by-step flow regulating unit being connected to a manual control console signal, the manual control console being adapted to manually control the flow of the first extrusion gas output by the first step-by-step flow regulating unit; a second step-by-step flow regulating unit connected to the first pressure reducer (36), the second step-by-step flow regulating unit being adapted to output the first extrusion gas in a step-by-step manner according to a time sequence; A first continuous flow regulating unit is connected to the first pressure reducer (36), and is suitable for continuously regulating the flow rate of the first extrusion gas output according to a time sequence; the first step-by-step flow regulating unit, the second step-by-step flow regulating unit, and the first continuous flow regulating unit are all connected to the input end of the liquid hydrogen tank (11), and the output end of the liquid hydrogen tank (11) is connected to the liquid hydrogen inlet of the hydrogen-oxygen engine (9).

5. The hydrogen-oxygen engine test gas distribution system according to claim 4, characterized in that: The first flow step-by-step adjustment unit comprises: A plurality of first solenoid valves (26) are all connected to the first extrusion gas supply structure (23), and the plurality of first solenoid valves (26) are all connected to the manual control console signal; the manual control console is suitable for manually controlling the connection or disconnection of the plurality of first solenoid valves (26); A plurality of first throttling elements (17), one end of which is respectively connected to a plurality of first solenoid valves (26), and the other end of which is connected to the input end of the liquid hydrogen tank (11), and the plurality of first throttling elements (17) are suitable for obtaining different throttling flow rates respectively; The second flow step-by-step adjustment unit comprises: A plurality of second solenoid valves (32), each connected to the first extruded gas supply structure (23) via the first pressure reducer (36); the plurality of second solenoid valves (32) are suitable for being connected or disconnected according to a time sequence; A plurality of second throttling elements (27), one end of which is respectively connected to a plurality of second solenoid valves (32), and the other end of which is connected to the input end of the liquid hydrogen tank (11), the plurality of second throttling elements (27) being suitable for obtaining different throttling flow rates respectively; The first flow continuous adjustment unit comprises: A first regulating valve (29) connected to the first extruded gas supply structure (23) via the first pressure reducer (36), the first regulating valve (29) being adapted to continuously adjust the opening according to a time sequence; A first remote control valve (30) has one end connected to the first regulating valve (29), and the other end of the first remote control valve (30) is connected to the input end of the liquid hydrogen tank (11); the first remote control valve (30) is suitable for being connected or disconnected by remote control.

6. The hydrogen-oxygen engine test gas distribution system according to claim 4, characterized in that: The liquid oxygen extrusion gas supply subsystem (7) and the liquid hydrogen extrusion gas supply subsystem (2) adopt a symmetrical structural arrangement.

7. The hydrogen-oxygen engine test gas distribution system according to claim 6, characterized in that: The liquid oxygen extrusion gas supply subsystem (7) comprises: A second extrusion gas supply structure (10), adapted to provide second extrusion gas; a second pressure reducer (40) connected to the second extrusion gas supply structure (10); a third step-by-step flow regulating unit connected to the second extrusion gas supply structure (10), the third step-by-step flow regulating unit being suitable for outputting the second extrusion gas in a step-by-step manner; the manual control console being signal-connected to the third step-by-step flow regulating unit, the manual control console being suitable for manually controlling the flow rate of the second extrusion gas output by the third step-by-step flow regulating unit; a fourth step-by-step flow regulating unit connected to the second pressure reducer (40), the fourth step-by-step flow regulating unit being adapted to output the second extrusion gas in a step-by-step manner according to a time sequence; The second continuous flow regulating unit is connected to the second pressure reducer (40), and the second continuous flow regulating unit is suitable for continuously regulating the flow rate of the second extrusion gas according to a time sequence; the third step-by-step flow regulating unit, the fourth step-by-step flow regulating unit, and the second continuous flow regulating unit are all connected to the input end of the liquid oxygen tank (6), and the output end of the liquid oxygen tank (6) is connected to the liquid oxygen inlet of the hydrogen-oxygen engine (9).

8. The hydrogen-oxygen engine test gas distribution system according to claim 2 or 3, characterized in that: The engine helium supply module also includes: An airtightness and control gas supply pipeline (16), one end of which is connected to the first helium supply structure (15) via a fourth pressure reducer (51); The gas supply valve box (5) is provided with a plurality of valves connected in parallel, one end of the plurality of valves being connected to the other end of the air tightness and control air supply pipeline (16), and the other ends of the plurality of valves being connected to different pipelines to be tested for air tightness or pipelines to be controlled for air supply in the hydrogen-oxygen engine (9); the gas supply valve box (5) is suitable for introducing helium into corresponding pipelines to be tested for air tightness in the hydrogen-oxygen engine (9) through the connection of different valves, so as to detect the air tightness of different pipelines in the hydrogen-oxygen engine (9) in combination with a helium leak detector, and introducing helium into pipelines to be controlled for air supply in the hydrogen-oxygen engine (9) through the connection of different valves.

9. The hydrogen-oxygen engine test gas distribution system according to claim 7, characterized in that: Also includes: One end of a plurality of parallel gas sealing pipelines is connected to a gas source through a pressure reducer, and the other end of the plurality of gas sealing pipelines is connected to a pipeline to be gas sealed; The gas source is a first extruded gas supply structure (23), a second extruded gas supply structure (10) and / or a first helium gas supply structure (15).

10. The hydrogen-oxygen engine test gas distribution system according to claim 4, characterized in that: Also includes: The second nitrogen supply structure (37) is suitable for providing nitrogen; the outlet of the first extruded gas supply structure (23) is connected to a second gas source supply switch (24), the outlet of the second gas source supply switch (24) is connected to one end of the first gas source supply switch (22), and the second nitrogen supply structure (37) is connected to the other end of the first gas source supply switch (22) via a gas source conversion switch (20); a venting hand valve (21) is provided on the pipeline connecting the first gas source supply switch (22) and the gas source conversion switch (20); the hydrogen-oxygen engine test gas distribution system has a liquid hydrogen extruded gas supply subsystem (2) to the liquid hydrogen storage tank (11) Before providing the first extrusion gas, the second gas source supply switch (24) is closed, the first gas source supply switch (22) and the gas source conversion switch (20) are opened, and nitrogen is supplied by the second nitrogen supply structure (37) to achieve a replacement state in which nitrogen replaces air in the pipeline of the liquid hydrogen extrusion gas supply subsystem (2); and after nitrogen replaces air in the pipeline of the liquid hydrogen extrusion gas supply subsystem (2), the first gas source supply switch (22) and the gas source conversion switch (20) are first closed, the gas release manual valve (21) is opened, and then the second gas source supply switch (24) is opened, so that the liquid hydrogen extrusion gas supply subsystem (2) provides the liquid hydrogen storage tank (11) with the first extrusion gas; a plurality of control gas supply pipelines (13), one end of which is connected to the second nitrogen supply structure (37) via a pressure reducer; A plurality of control valve boxes (12) are respectively connected to a plurality of control gas supply pipelines (13); the control valve boxes (12) are respectively connected to control ends of a plurality of pneumatic valves via a plurality of solenoid valves suitable for remote control; the control valve boxes (12) are suitable for, when the remote control solenoid valve is opened, nitrogen is input to the control end of the corresponding pneumatic valve to open the corresponding pneumatic valve, and when the remote control solenoid valve is closed, nitrogen is not input to the control end of the corresponding pneumatic valve to close the corresponding pneumatic valve; The fire-fighting pipeline (28) is connected to the second nitrogen supply structure (37), and the fire-fighting pipeline (28) is suitable for releasing nitrogen to isolate oxygen in the air for fire-fighting.

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