CN110425417B - Nitrogen supply system suitable for large liquid rocket engine test - Google Patents

Abstract

The application discloses nitrogen supply system suitable for large-scale liquid rocket engine test relates to liquid rocket engine test technical field to solve current nitrogen gas supply and liquid nitrogen supply separation to a certain extent, cause the high technical problem of test system construction cost. The nitrogen supply system comprises a liquid nitrogen storage unit, a liquid nitrogen cooling unit and a liquid nitrogen gasification unit; the liquid nitrogen cooling unit and the liquid nitrogen gasification unit are both communicated with the liquid nitrogen storage unit; the liquid nitrogen storage unit is used for providing liquid nitrogen for the liquid nitrogen cooling unit and the liquid nitrogen gasification unit; the liquid nitrogen cooling unit is used for supercooling the low-temperature propellant of the rocket engine; the liquid nitrogen gasification unit is used for gasifying the liquid nitrogen and conveying the liquid nitrogen to the rocket engine ground test system. This application is with liquid nitrogen cooling unit, liquid nitrogen gasification unit and nitrogen gas integrated control unit integration, forms one set of supply system, reduces test system construction and maintenance cost.

Description

Nitrogen supply system suitable for large liquid rocket engine test

Technical Field

The application relates to the technical field of liquid rocket engine tests, in particular to a nitrogen supply system suitable for a large-scale liquid rocket engine test.

Background

The liquid rocket usually needs to use a large amount of nitrogen when carrying out ground tests, and meanwhile, liquid nitrogen is used for supercooling in the process of carrying out low-temperature propellant, so that the propellant can be saved, the cost can be saved, and the engine pump can be ensured not to generate cavitation erosion. In the existing test system, nitrogen supply and liquid nitrogen supply are separated, so that the construction cost of the test system is high, and the cost of the test system is correspondingly increased in the process of carrying out tests and maintaining.

Therefore, how to provide a nitrogen supply system integrating liquid nitrogen cooling, liquid nitrogen gasification and nitrogen gas supply has become a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The application aims to provide a nitrogen supply system integrating liquid nitrogen cooling, liquid nitrogen gasification production of nitrogen and nitrogen supply, and solves the technical problem that the construction cost of a test system is high due to separation of the existing nitrogen supply and the liquid nitrogen supply to a certain extent.

The application provides a nitrogen supply system suitable for a large liquid rocket engine test, which comprises a liquid nitrogen storage unit, a liquid nitrogen cooling unit and a liquid nitrogen gasification unit; the liquid nitrogen storage unit is respectively communicated with the liquid nitrogen cooling unit and the liquid nitrogen gasification unit and is used for providing liquid nitrogen for the liquid nitrogen cooling unit and the liquid nitrogen gasification unit; the liquid nitrogen cooling unit is used for supercooling the low-temperature propellant of the rocket engine; the liquid nitrogen gasification unit is used for gasifying liquid nitrogen and conveying the liquid nitrogen to the rocket engine ground test system;

the liquid nitrogen storage unit is provided with a filling port, a tenth stop valve, a liquid nitrogen storage tank, a first temperature sensor and a first pressure sensor which are sequentially communicated, and the filling port is used for providing raw materials for a nitrogen supply system; the liquid nitrogen cooling unit and the liquid nitrogen gasification unit are respectively communicated with the back of the first pressure sensor through a sixth three-way valve;

the liquid nitrogen gasification unit comprises a low-temperature pump, a gasifier and a nitrogen storage tank which are sequentially communicated; the cryogenic pump is used for conveying liquid nitrogen into the gasifier, the gasifier is used for gasifying the liquid nitrogen, and the nitrogen storage tank is used for storing nitrogen;

the liquid nitrogen cooling unit comprises at least two branches, wherein the at least two branches comprise a first branch and a second branch; the first branch is sequentially provided with a first stop valve, a first temperature sensor and a first three-way valve, the second end of the first three-way valve is connected with a second stop valve, the third end of the first three-way valve is communicated with an oxidant path, and the first branch is used for providing liquid nitrogen for the oxidant path; the second branch is sequentially provided with a third stop valve, a second temperature sensor and a second three-way valve, the second end of the second three-way valve is connected with a fourth stop valve, the third end of the second three-way valve is communicated with the fuel path, and the second branch is used for providing liquid nitrogen for the fuel path.

Further, still include: a nitrogen integrated control unit; the liquid nitrogen gasification unit is communicated with the nitrogen integrated control unit; the nitrogen integrated control unit is used for conveying gasified liquid nitrogen to the rocket engine ground test system.

Further, the nitrogen integrated control unit includes: a main path and a shunt; a manual stop valve and a pneumatic stop valve are arranged on the main road, and the manual stop valve and the pneumatic stop valve are arranged in parallel; the shunt circuit comprises at least five nitrogen control shunt circuits.

Further, the first nitrogen control branch is an oxidant storage pressurization road; the oxidant storage pressurization path is sequentially provided with a first pressure reducer and a third three-way valve; a fifth stop valve is arranged at the second end of the third three-way valve, and a first pressure gauge is arranged at the third end of the third three-way valve;

the first pressure reducer is used for adjusting the pressure value of the oxidant storage pressurization road; the first pressure gauge is used for monitoring the pressure value of the oxidant storage pressurization road roller; and when the numerical value of the first pressure gauge is larger than a preset pressure value, the fifth stop valve is opened and used for deflating and decompressing the oxidant storage pressurizing path.

Further, the second nitrogen control branch is a fuel storage pressurization path; a second pressure reducer and a fourth three-way valve are sequentially arranged on the fuel storage pressurizing road; a sixth stop valve is arranged at the second end of the fourth three-way valve, and a second pressure gauge is arranged at the third end of the fourth three-way valve;

the second pressure reducer is used for adjusting the pressure value of the fuel storage pressurization road; the second pressure gauge is used for monitoring the pressure value of the fuel storage pressurization road; and when the numerical value of the second pressure gauge is larger than a preset pressure value, the sixth stop valve is opened and used for deflating and decompressing the fuel storage pressurizing path.

Further, the third nitrogen control branch is a system blowing branch; a third pressure reducer and a fifth three-way valve are sequentially arranged on the system blowing-off road; a seventh stop valve is arranged at the first end of the fifth three-way valve, and a third pressure gauge is arranged at the second end of the fifth three-way valve;

the third pressure reducer is used for adjusting the pressure value of the system blowing way; the third pressure gauge is used for monitoring the pressure value of the system blowing way; and when the numerical value of the third pressure gauge is larger than a preset pressure value, opening the seventh stop valve, wherein the seventh stop valve is used for deflating and decompressing the blowing way of the system.

Furthermore, the fourth nitrogen control branch is a pneumatic valve control gas circuit; a fourth pressure reducer and a sixth three-way valve are sequentially arranged on the pneumatic valve control air path; an eighth stop valve is arranged at the first end of the sixth three-way valve, and a fourth pressure gauge is arranged at the second end of the sixth three-way valve;

the fourth pressure reducer is used for adjusting the pressure value of the pneumatic valve operation gas path; the fourth pressure gauge is used for monitoring the pressure value of the pneumatic valve control gas circuit; and when the numerical value of the fourth pressure gauge is larger than a preset pressure value, the eighth stop valve is opened and used for deflating and decompressing the pneumatic valve control air circuit.

Furthermore, the fifth nitrogen control branch is a pneumatic pressure reducer control gas circuit; a fifth pressure reducer and a seventh three-way valve are sequentially arranged on the pneumatic pressure reducer operation gas path; a ninth stop valve is arranged at the first end of the seventh three-way valve, and a fifth pressure gauge is arranged at the second end of the seventh three-way valve;

the fifth pressure reducer is used for adjusting the pressure value of the pneumatic pressure reducer operation gas path; the fifth pressure gauge is used for monitoring the pressure value of the pneumatic pressure reducer operation gas path; and when the numerical value of the fifth pressure gauge is greater than a preset pressure value, the ninth stop valve is opened and is used for controlling the air passage of the pneumatic pressure reducer to deflate and release the pressure.

A nitrogen supply system as described herein has the following advantages over the prior art:

the application provides a nitrogen supply system, which comprises a liquid nitrogen storage unit, a liquid nitrogen cooling unit and a liquid nitrogen gasification unit; the liquid nitrogen cooling unit and the liquid nitrogen gasification unit are both communicated with the liquid nitrogen storage unit; the liquid nitrogen storage unit is used for providing liquid nitrogen for the liquid nitrogen cooling unit and the liquid nitrogen gasification unit; the liquid nitrogen cooling unit is used for supercooling the low-temperature propellant of the rocket engine; the liquid nitrogen gasification unit is used for gasifying liquid nitrogen and conveying the liquid nitrogen to the rocket engine ground test system. The application provides a nitrogen supply system solves current nitrogen gas supply and liquid nitrogen supply separation to a certain extent, causes the high technical problem of test system construction cost.

The liquid nitrogen integrated control system is applied to a large liquid rocket engine test, can simultaneously use liquid nitrogen and nitrogen, integrates a liquid nitrogen cooling unit, a liquid nitrogen gasification unit and a nitrogen integrated control unit into a set of supply system, and reduces the construction and maintenance cost of the test system; and the nitrogen integrated supply unit realizes the supply function of multiple functions of nitrogen in a centralized manner, simplifies the test system and is convenient to operate.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a flow diagram of a nitrogen supply system suitable for testing a large liquid rocket engine provided by an embodiment of the application;

FIG. 2 is a flow diagram of a liquid nitrogen cooling unit provided by an embodiment of the present application;

FIG. 3 is a flow diagram of a liquid nitrogen gasification unit provided by an embodiment of the present application;

FIG. 4 is a flow chart of a nitrogen integrated control unit provided in an embodiment of the present application;

fig. 5 is a flowchart of a liquid nitrogen storage unit provided in an embodiment of the present application.

Reference numerals: 100-a liquid nitrogen storage unit; 101-a filling port; 102-tenth stop valve; 103-a liquid nitrogen storage tank; 104-a first temperature sensor; 105-a first pressure sensor; 106-a first safety valve; 107-a sixth pressure gauge; 200-liquid nitrogen cooling unit; 201-a sixteenth stop valve; 202-a fourth temperature sensor; 203-seventeenth stop valve; 204-a first stop valve; 205-a fifth temperature sensor; 206-a second shut-off valve; 207-third stop valve; 208-a sixth temperature sensor; 209-a fourth stop valve; 300-liquid nitrogen gasification unit; 301-eleventh stop valve; 302-a cryopump; 303-a second temperature sensor; 304-a fifteenth stop valve; 305-a twelfth stop valve; 306-a gasifier; 307-a second pressure sensor; 308-a thirteenth stop valve; 309-a third temperature sensor; 310-nitrogen storage tank; 311-a fourteenth cut-off valve; 312-a second safety valve; 313-a seventh pressure gauge; 400-nitrogen integrated control unit; 401-a first filter; 402-manual shut-off valve; 403-pneumatic stop valve; 404-a second filter; 405-an eighteenth stop valve; 406-an eighth pressure gauge; 407-a third pressure sensor; 411-nineteenth stop valve; 412-a first reducer; 413-a fifth stop valve; 414-first pressure gauge; 415-twentieth cut-off valve; 416-a first one-way valve; 417-first pneumatic stop valve; 421-twenty-first stop valve; 422-a second stress-reducer; 423-a sixth stop valve; 424-second pressure gauge; 425-a twenty-second stop valve; 426-a second one-way valve; 427-a second pneumatic stop valve; 431-a twenty-third stop valve; 432-a third pressure reducer; 433-a seventh stop valve; 434-third pressure gauge; 435-twenty-fourth stop valve; 436-solenoid valves; 441-twenty-fifth stop valve; 442-a fourth pressure reducer; 443-eighth stop valve; 444-fourth pressure gauge; 445-twenty-sixth stop valve; 446-a buffer tank; 451-twenty-seventh stop valve; 452-a fifth stress-reducer; 453-ninth stop valve; 454-a fifth pressure gauge; 455-the twenty-eighth stop valve.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Referring to fig. 1-5, fig. 1 is a flow diagram of a nitrogen supply system provided by an embodiment of the present application; FIG. 2 is a flow diagram of a liquid nitrogen cooling unit provided by an embodiment of the present application; FIG. 3 is a flow diagram of a liquid nitrogen gasification unit provided by an embodiment of the present application; FIG. 4 is a flow chart of a nitrogen integrated control unit provided in an embodiment of the present application; fig. 5 is a flowchart of a liquid nitrogen storage unit provided in an embodiment of the present application.

The application provides a nitrogen supply system suitable for large-scale liquid rocket engine tests, which comprises a liquid nitrogen storage unit 100, a liquid nitrogen cooling unit 200 and a liquid nitrogen gasification unit 300; the liquid nitrogen cooling unit 200 and the liquid nitrogen gasification unit 300 are both communicated with the liquid nitrogen storage unit 100; the liquid nitrogen storage unit 100 is used for providing liquid nitrogen to the liquid nitrogen cooling unit 200 and the liquid nitrogen gasification unit 300; the liquid nitrogen cooling unit 200 is used for supercooling the low-temperature propellant of the rocket engine; the liquid nitrogen gasification unit 300 is used for gasifying and conveying liquid nitrogen to the rocket engine ground test system.

The application provides a nitrogen supply system suitable for large liquid rocket engine tests, which is shown in a figure 1 and a figure 5 in order to realize integration of nitrogen supply and liquid nitrogen supply; the device comprises a liquid nitrogen storage unit 100, a liquid nitrogen cooling unit 200 and a liquid nitrogen gasification unit 300; the liquid nitrogen cooling unit 200 and the liquid nitrogen gasification unit 300 are both communicated with the liquid nitrogen storage unit 100; the liquid nitrogen storage unit 100 is used for providing liquid nitrogen to the liquid nitrogen cooling unit 200 and the liquid nitrogen gasification unit 300; the liquid nitrogen cooling unit 200 is used for supercooling the low-temperature propellant of the rocket engine; the liquid nitrogen gasification unit 300 is used for gasifying and conveying liquid nitrogen to the rocket engine ground test system.

In particular, the low-temperature propellant in the application refers to a propellant which cannot be stored at the ambient temperature of ground and space use and can be kept in a liquid state in a storage tank for a long time only at extremely low ambient temperature, and belongs to the category of non-storable propellants. The liquid oxygen/liquid hydrogen propellant combined liquid propellant with the highest specific impulse used at present is widely used on large carrier rockets and space vehicles. For example, liquid oxygen is a low-temperature propellant, and the specific temperature is controlled between 180 ℃ below zero and 160 ℃ below zero.

Specifically, the liquid nitrogen integrated control system is applied to a large liquid rocket engine test, liquid nitrogen and nitrogen can be simultaneously used, the liquid nitrogen cooling unit 200, the liquid nitrogen gasification unit 300 and the nitrogen integrated control unit 400 are integrated to form a set of supply system, and the construction and maintenance cost of the test system is reduced; and the nitrogen integrated supply unit realizes the supply function of multiple functions of nitrogen in a centralized manner, simplifies the test system and is convenient to operate.

More specifically, the ground test of the rocket engine is an important part of the large ground test of the rocket, and the test run of the liquid rocket engine is divided into a ground cold test and a ground hot test according to whether the liquid rocket engine adopts a real propellant or not, and the test runs are also called cold set vehicle and hot test run. The cold test of the liquid rocket engine usually uses water as working medium, the hot test of the liquid rocket engine mainly carrying out the test of the starting and shutdown characteristics of an engine system is a real ignition test, and the engine test is carried out according to the development procedure and the scheme stage; in the initial stage, the engine performance and structure scheme is required to be tested; performing appraisal test run and acceptance test run in the stage of the sample; and carrying out batch production spot check test run after batch production is carried out.

Further, the liquid nitrogen storage unit 100 is provided with a filling port 101, a tenth stop valve 102, a liquid nitrogen storage tank 103, a first temperature sensor 104 and a first pressure sensor 105 which are sequentially communicated, the liquid nitrogen storage tank 103 is also provided with a first safety valve 106 and a sixth pressure gauge 107, and the filling port 101 is used for providing raw materials for a nitrogen supply system; the first pressure sensor 105 is connected to the liquid nitrogen cooling unit 200 and the liquid nitrogen gasification unit 300 through a sixth three-way valve.

The embodiment of the present application provides an embodiment, in order to integrate a supply system of multiple applications of nitrogen into a whole, see fig. 4; the application also includes: a nitrogen integrated control unit 400; the liquid nitrogen gasification unit 300 is communicated with the nitrogen integrated control unit 400; the liquid nitrogen gasification unit 300 supplies nitrogen to the nitrogen integrated control unit 400, and the nitrogen integrated control unit 400 gasifies and delivers the liquid nitrogen to the rocket engine ground test system.

Specifically, the nitrogen integrated control unit 400 integrates a plurality of supply systems using nitrogen to form a gas distribution panel, thereby realizing the supply of nitrogen with a plurality of functions; the problem of a nitrogen supply system which can simultaneously drive a plurality of pneumatic valves under the condition of lower cost is solved.

In one embodiment of the present application, to meet the nitrogen requirements for rocket motor testing, see FIG. 3; the liquid nitrogen gasification unit 300 comprises a cryogenic pump 302, a gasifier 306 and a nitrogen storage tank 310 which are communicated in sequence; cryopump 302 is configured to deliver liquid nitrogen to vaporizer 306, vaporizer 306 is configured to vaporize the liquid nitrogen, and nitrogen storage tank 310 is configured to store nitrogen.

Specifically, the cryogenic pump 302, also referred to as a cryogenic liquid pump, as used herein is a special pump used to transport cryogenic liquid in air separation and chemical plants. Which can transport cryogenic liquid from a location of low pressure to a location of high pressure.

Specifically, the liquid nitrogen vaporizing unit 300 is provided with an eleventh stop valve 301, a cryopump 302, a second temperature sensor 303, a seventh three-way valve, a twelfth stop valve 305, a vaporizer 306, a second pressure sensor 307, a thirteenth stop valve 308, a third temperature sensor 309, a nitrogen storage tank 310, and a fourteenth stop valve 311, which are sequentially communicated, wherein the seventh three-way valve is further provided with a fifteenth stop valve 304, a second safety valve 312, and a seventh pressure gauge 313, which are communicated with each other.

More specifically, the cryopump 302 is a vacuum pump, also referred to as a condensate pump, that condenses gases using cryogenic surfaces. The cryopump 302 can obtain a clean vacuum with a maximum pumping rate and a minimum ultimate pressure, and is widely applied to the research and production of semiconductors and integrated circuits, the research and production of molecular beams, vacuum coating equipment, vacuum surface analysis instruments, ion implanters, space simulation devices and the like.

In one embodiment of the present application, to meet the liquid nitrogen requirements for rocket motor testing, see FIGS. 2, 3, and 5; the liquid nitrogen cooling unit 200 of the present application includes at least two branches;

the first branch is sequentially provided with a first stop valve 204, a first temperature sensor 104 and a first three-way valve which are communicated, one end of the first three-way valve is provided with a second stop valve 206, the other end of the first three-way valve is communicated with an oxidant path, and the first branch is used for providing liquid nitrogen for the oxidant path;

and a third stop valve 207, a second temperature sensor 303 and a second three-way valve which are communicated with each other are sequentially arranged on the second branch, a fourth stop valve 209 is arranged at one end of the second three-way valve, the other end of the second three-way valve is communicated with the fuel path, and the second branch is used for providing liquid nitrogen for the fuel path.

Specifically, the liquid nitrogen cooling unit 200 is provided with a sixteenth stop valve 201, a fourth temperature sensor 202 and an eighth three-way valve which are sequentially communicated, one end of the eighth three-way valve is communicated with a seventeenth stop valve 203, and the other end of the eighth three-way valve is connected with two parallel branches; the first branch is provided with a first stop valve 204, a fifth temperature sensor 205 and a ninth three-way valve which are sequentially communicated, one end of the ninth three-way valve is communicated with a second stop valve 206, and the other end of the ninth three-way valve is communicated with the oxidation path; the second branch is provided with a third stop valve 207, a sixth temperature sensor 208 and a thirteenth through valve which are communicated in sequence, one end of the thirteenth through valve is communicated with a fourth stop valve 209, and the other end of the thirteenth through valve is communicated with the fuel path.

In one embodiment of the present application, in order to implement the function of remotely controlling the nitrogen gas supply main valve without an additional gas source, referring to fig. 4, the nitrogen gas integrated control unit 400 includes: a main path and a branch path; a manual stop valve 402 and a pneumatic stop valve 403 are arranged on the main road, and the manual stop valve 402 and the pneumatic stop valve 403 are arranged in parallel; the branch comprises at least five nitrogen control branches.

Specifically, the main path is provided with a first filter 401, a manual stop valve 402, a pneumatic stop valve 403, a second filter 404 and an eleventh three-way valve which are sequentially communicated, one end of the eleventh three-way valve is communicated with an eighteenth stop valve 405, the other end of the eleventh three-way valve is communicated with an eighth pressure gauge 406 and a third pressure sensor 407, and at least five branches are communicated behind the third pressure sensor 407.

In one embodiment of the present application, to provide nitrogen to the oxidant storage plenum, see FIG. 4; wherein the first nitrogen control branch is an oxidant storage pressurization road; the oxidant storage pressurization path is sequentially provided with a first pressure reducer 412 and a third three-way valve which are communicated with each other; a branch at one end of the third three-way valve is provided with a fifth stop valve 413, and a branch at the other end of the third three-way valve is provided with a first pressure gauge 414;

the first pressure reducer 412 is used for adjusting the pressure value of the oxidant storage pressurization road; the first pressure gauge 414 is used for monitoring the pressure value of the oxidant storage pressurization road; when the value of the first pressure gauge 414 is greater than the preset pressure value, the fifth stop valve 413 is opened, and the fifth stop valve 413 is used for discharging and decompressing the oxidant storage pressurizing path.

Specifically, a nineteenth stop valve 411, a first pressure reducer 412 and a third three-way valve which are sequentially communicated are arranged on the oxidant storage pressurizing pipeline, one end of the third three-way valve is communicated with a fifth stop valve 413, and the other end of the third three-way valve is sequentially communicated with a first pressure gauge 414, a twentieth stop valve 415, a first one-way valve 416 and a first pneumatic stop valve 417.

In one embodiment of the present application, to provide nitrogen to the fuel storage plenum, see FIG. 4; wherein the second branch is a fuel storage boost path; a second pressure reducer 422 and a fourth three-way valve which are communicated with each other are sequentially arranged on the fuel storage pressurizing road; a branch at one end of the fourth three-way valve is provided with a sixth stop valve 423, and a branch at the other end of the fourth three-way valve is provided with a second pressure gauge 424;

the second pressure reducer 422 is used for storing the pressure value of the pressurization road for fuel; a second pressure gauge 424 is used to monitor the pressure value of the fuel storage pressurization road; when the value of the second pressure gauge 424 is greater than the required pressure, the sixth stop valve 423 is opened, and the sixth stop valve 423 is used for deflating and releasing the pressure of the fuel storage pressurization path.

Specifically, a twenty-first stop valve 421, a second pressure reducer 422 and a fourth three-way valve which are communicated in sequence are arranged on the fuel storage pressurization road, one end of the fourth three-way valve is communicated with a sixth stop valve 423, and the other end of the fourth three-way valve is communicated with a second pressure gauge 424, a twenty-second stop valve 425, a second one-way valve 426 and a second pneumatic stop valve 427 in sequence.

In one embodiment of the present application, to provide nitrogen to the system purge line, see FIG. 4; wherein the third branch is a system blow-off line; a third pressure reducer 432 and a fifth three-way valve which are communicated with each other are sequentially arranged on the system blowing-off road; a branch at one end of the fifth three-way valve is provided with a seventh stop valve 433, and a branch at the other end of the fifth three-way valve is provided with a third pressure gauge 434;

the third pressure reducer 432 is used for adjusting the pressure value of nitrogen provided by the system blowing line; the third pressure gauge 434 is used for monitoring the pressure value of nitrogen provided by the system blowing way; when the value of the third pressure gauge 434 is greater than the required pressure, the seventh stop valve 433 is opened, and the seventh stop valve 433 is used for providing nitrogen gas for the system blowing path to deflate and release pressure.

Specifically, a twenty-third stop valve 431, a third pressure reducer 432 and a fifth three-way valve which are communicated in sequence are arranged on the system blowing road, one end of the fifth three-way valve is communicated with a seventh stop valve 433, and the other end of the fifth three-way valve is communicated with a third pressure gauge 434, a twenty-fourth stop valve 435 and an electromagnetic valve 436 in sequence.

In one embodiment of the present application, to provide nitrogen to the pneumatic valve operating gas circuit, see fig. 4; the fourth branch is a pneumatic valve control air path; a fourth pressure reducer 442 and a sixth three-way valve which are communicated with each other are sequentially arranged on the pneumatic valve control gas circuit; an eighth stop valve 443 is arranged on a branch at one end of the sixth three-way valve, and a fourth pressure gauge 444 is arranged on a branch at the other end of the sixth three-way valve;

the fourth pressure reducer 442 is used for adjusting the pressure value of the pneumatic valve operation gas circuit; the fourth pressure gauge 444 is used for monitoring the pressure value of the pneumatic valve control gas circuit; when the value of the fourth pressure gauge 444 is larger than the required pressure, the eighth cut-off valve 443 is opened, and the eighth cut-off valve 443 is used for deflating and releasing pressure of the pneumatic valve operation air passage.

Specifically, a twenty-fifth stop valve 441, a fourth decompressor 442 and a sixth three-way valve which are sequentially communicated are arranged on the pneumatic valve operation air path, one end of the sixth three-way valve is communicated with the eighth stop valve 443, and the other end of the sixth three-way valve is sequentially communicated with a fourth pressure gauge 444, a twenty-sixth stop valve 445 and a buffer tank 446.

In one embodiment of the present application, in order to supply nitrogen gas to the pneumatic pressure reducer operation gas path, see fig. 4; the fifth branch is a pneumatic pressure reducer control air path; a fifth pressure reducer 452 and a seventh three-way valve which are communicated with each other are sequentially arranged on the pneumatic pressure reducer operation gas path; a ninth stop valve 453 is arranged on a branch at one end of the seventh three-way valve, and a fifth pressure gauge 454 is arranged on a branch at the other end of the seventh three-way valve;

the fifth pressure reducer 452 is used for adjusting the pressure value of the pneumatic pressure reducer operation gas path; the fifth pressure gauge 454 is used for monitoring the pressure value of the pneumatic pressure reducer operation gas path; when the value of the fifth pressure gauge 454 is larger than the required pressure, the ninth stop valve 453 is opened, and the ninth stop valve 453 is used for deflating and decompressing the pneumatic pressure reducer operation air path.

Specifically, a twenty-seventh stop valve 451, a fifth pressure reducer 452 and a seventh three-way valve which are sequentially communicated are arranged on the pneumatic pressure reducer operation gas path, one end of the seventh three-way valve is communicated with a ninth stop valve 453, and the other end of the seventh three-way valve is sequentially communicated with a fourth pressure gauge 444 and a twenty-eighth stop valve 455.

The nitrogen supply system of the present application works as follows:

firstly, opening a tenth stop valve 102 to fill a liquid nitrogen storage tank, and filling the liquid nitrogen storage tank through a filling port 101 by using a tank car in a main mode; after the liquid nitrogen storage tank is filled, the tenth stop valve 102 is closed, the eleventh stop valve 301 is opened, the cryogenic pump 302 is started, the twelfth stop valve 305 is opened, the vaporizer 306 is started, the thirteenth stop valve 308 is opened, the first temperature sensor 104, the first pressure sensor 105 and the second temperature sensor 303 are observed to ensure that the cryogenic pump 302 operates safely, the second pressure sensor 307 and the third temperature sensor 309 are observed to ensure that the vaporizer 306 operates in a safe pressure range, when the seventh pressure gauge 313 is observed until the nitrogen storage tank 310 reaches a design pressure, the thirteenth manual stop valve 402, the vaporizer 306, the cryogenic pump 302 and the eleventh stop valve 301 are closed, the fourteenth stop valve 311 is opened, the twelfth stop valve 305 and the fourteenth stop valve 311 are closed after the residual liquid in the pipeline is completely deflated, and the nitrogen storage tank 310 is completely filled.

After the nitrogen storage tank 310 is filled, the fourteenth stop valve 311 and the manual stop valve 402 are opened, then the twenty-fifth stop valve 441 is opened, the fourth pressure reducer 442 is adjusted to enable the output pressure to be the required pressure, the fourth pressure gauge 444 is used for indicating, if the output pressure is adjusted in a wrong mode, the eighth stop valve 443 is opened to deflate and release the pressure, then the twenty-sixth stop valve 445 is opened, each pneumatic valve in the system can be driven at the moment, the pneumatic stop valve 403 is opened, and the manual stop valve 402 is closed. Then, the nineteenth stop valve 411 is opened, the first pressure reducer 412 is adjusted to make the output pressure the required pressure, the first pressure gauge 414 indicates the required pressure, if the output pressure is adjusted incorrectly, the fifth stop valve 413 is opened to release the air and release the pressure, and then the twentieth stop valve 415 is opened until the pressure increase path of the oxidant storage tank is adjusted completely. Then the twenty-first stop valve 421 is opened, the second pressure reducer 422 is adjusted to make the output pressure reach the required pressure, the second pressure gauge 424 indicates the output pressure, if the output pressure is adjusted by mistake, the sixth stop valve 423 is opened to release air and release pressure, and then the twenty-second stop valve 425 is opened, so far, the adjustment of the fuel storage tank pressurization path is completed. And then, the twenty-third stop valve 431 is opened, the third pressure reducer 432 is adjusted to enable the output pressure to be the required pressure, the third pressure gauge 434 indicates the pressure, if the output pressure is adjusted incorrectly, the seventh stop valve 433 is opened to deflate and release the pressure, and then the twenty-fourth stop valve 435 is opened, so that the system blowing path is adjusted completely. Then, the twenty-seventh stop valve 451 and the twenty-eighth stop valve 455 are opened, the fifth pressure reducer 452 is adjusted to be indicated by the fifth pressure gauge 454, the output pressure of the pneumatic pressure reducer is observed, the fifth pressure reducer is adjusted to enable the output pressure of the pneumatic pressure reducer to be the required pressure, if the output pressure is adjusted in a wrong mode, the ninth stop valve 453 is opened to deflate and release the pressure, and the pneumatic pressure reducer is operated to control the air path to be adjusted.

In the process of cooling liquid nitrogen, test preparation is firstly needed to confirm that a valve at the outlet of a system storage tank is in a closed state. The sixteenth stop valve 201 is opened and the fourth temperature sensor 202 is observed. For the oxidant path, the first shut-off valve 204 is opened and the fifth temperature sensor 205 is observed to ensure that the liquid nitrogen temperature is within the design range. For the fuel path, the manual shut-off valve 402 is opened third, and the sixth temperature sensor 208 is observed to ensure that the liquid nitrogen temperature is within the design range. After the liquid nitrogen precooling is finished, the sixteenth stop valve 201 is closed, the first stop valve 204 and the third stop valve 207 are closed, the seventeenth stop valve 203 is opened, and the second stop valve 206 and the fourth stop valve 209 are opened. And after the residual liquid in the pipeline is completely deflated, closing the seventeenth stop valve 203, and closing the second stop valve 206 and the fourth stop valve 209 until the liquid nitrogen cooling process is completed.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (8)

1. A nitrogen supply system suitable for large-scale liquid rocket engine tests is characterized by comprising a liquid nitrogen storage unit, a liquid nitrogen cooling unit and a liquid nitrogen gasification unit; the liquid nitrogen storage unit is respectively communicated with the liquid nitrogen cooling unit and the liquid nitrogen gasification unit and is used for providing liquid nitrogen for the liquid nitrogen cooling unit and the liquid nitrogen gasification unit; the liquid nitrogen cooling unit is used for supercooling the low-temperature propellant of the rocket engine; the liquid nitrogen gasification unit is used for gasifying liquid nitrogen and conveying the liquid nitrogen to the rocket engine ground test system;

the liquid nitrogen storage unit is provided with a filling port, a tenth stop valve, a liquid nitrogen storage tank, a first temperature sensor and a first pressure sensor which are sequentially communicated, and the filling port is used for providing raw materials for a nitrogen supply system; the liquid nitrogen cooling unit and the liquid nitrogen gasification unit are respectively communicated with the back of the first pressure sensor through a sixth three-way valve;

the liquid nitrogen gasification unit comprises a low-temperature pump, a gasifier and a nitrogen storage tank which are sequentially communicated; the cryogenic pump is used for conveying liquid nitrogen into the gasifier, the gasifier is used for gasifying the liquid nitrogen, and the nitrogen storage tank is used for storing nitrogen;

the liquid nitrogen cooling unit comprises at least two branches, wherein the at least two branches comprise a first branch and a second branch; the first branch is sequentially provided with a first stop valve, a first temperature sensor and a first three-way valve, the second end of the first three-way valve is connected with a second stop valve, the third end of the first three-way valve is communicated with an oxidant path, and the first branch is used for providing liquid nitrogen for the oxidant path; the second branch is sequentially provided with a third stop valve, a second temperature sensor and a second three-way valve, the second end of the second three-way valve is connected with a fourth stop valve, the third end of the second three-way valve is communicated with the fuel path, and the second branch is used for providing liquid nitrogen for the fuel path.

2. The nitrogen supply system suitable for large liquid rocket engine testing of claim 1, further comprising: a nitrogen integrated control unit; the liquid nitrogen gasification unit is communicated with the nitrogen integrated control unit; the nitrogen integrated control unit is used for conveying gasified liquid nitrogen to the rocket engine ground test system.

3. The nitrogen supply system suitable for large liquid rocket engine testing of claim 2, wherein said nitrogen integrated control unit comprises: a main path and a shunt; a manual stop valve and a pneumatic stop valve are arranged on the main road, and the manual stop valve and the pneumatic stop valve are arranged in parallel; the shunt circuit comprises at least five nitrogen control shunt circuits.

4. The nitrogen supply system suitable for large liquid rocket engine testing of claim 3, wherein the first nitrogen control branch is an oxidizer storage pressurization path; the oxidant storage pressurization path is sequentially provided with a first pressure reducer and a third three-way valve; a fifth stop valve is arranged at the second end of the third three-way valve, and a first pressure gauge is arranged at the third end of the third three-way valve;

the first pressure reducer is used for adjusting the pressure value of the oxidant storage pressurization road; the first pressure gauge is used for monitoring the pressure value of the oxidant storage pressurization road roller; and when the numerical value of the first pressure gauge is larger than a preset pressure value, the fifth stop valve is opened and used for deflating and decompressing the oxidant storage pressurizing path.

5. The nitrogen supply system suitable for large liquid rocket engine testing of claim 3, wherein the second nitrogen control branch is a fuel storage pressurization road; a second pressure reducer and a fourth three-way valve are sequentially arranged on the fuel storage pressurizing road; a sixth stop valve is arranged at the second end of the fourth three-way valve, and a second pressure gauge is arranged at the third end of the fourth three-way valve;

the second pressure reducer is used for adjusting the pressure value of the fuel storage pressurization road; the second pressure gauge is used for monitoring the pressure value of the fuel storage pressurization road; and when the numerical value of the second pressure gauge is larger than a preset pressure value, the sixth stop valve is opened and used for deflating and decompressing the fuel storage pressurizing path.

6. The nitrogen supply system suitable for large liquid rocket engine testing of claim 3, wherein the third nitrogen control branch is a system blow-off branch; a third pressure reducer and a fifth three-way valve are sequentially arranged on the system blowing-off road; a seventh stop valve is arranged at the first end of the fifth three-way valve, and a third pressure gauge is arranged at the second end of the fifth three-way valve;

the third pressure reducer is used for adjusting the pressure value of the system blowing way; the third pressure gauge is used for monitoring the pressure value of the system blowing way; and when the numerical value of the third pressure gauge is larger than a preset pressure value, opening the seventh stop valve, wherein the seventh stop valve is used for deflating and decompressing the blowing way of the system.

7. The nitrogen supply system suitable for large liquid rocket engine testing of claim 3, wherein the fourth nitrogen control branch is a pneumatic valve control gas path; a fourth pressure reducer and a sixth three-way valve are sequentially arranged on the pneumatic valve control air path; an eighth stop valve is arranged at the first end of the sixth three-way valve, and a fourth pressure gauge is arranged at the second end of the sixth three-way valve;

the fourth pressure reducer is used for adjusting the pressure value of the pneumatic valve operation gas path; the fourth pressure gauge is used for monitoring the pressure value of the pneumatic valve control gas circuit; and when the numerical value of the fourth pressure gauge is larger than a preset pressure value, the eighth stop valve is opened and used for deflating and decompressing the pneumatic valve control air circuit.

8. The nitrogen supply system suitable for large liquid rocket engine testing of claim 3, wherein the fifth nitrogen control branch is a pneumatic pressure reducer operation gas path; a fifth pressure reducer and a seventh three-way valve are sequentially arranged on the pneumatic pressure reducer operation gas path; a ninth stop valve is arranged at the first end of the seventh three-way valve, and a fifth pressure gauge is arranged at the second end of the seventh three-way valve;

the fifth pressure reducer is used for adjusting the pressure value of the pneumatic pressure reducer operation gas path; the fifth pressure gauge is used for monitoring the pressure value of the pneumatic pressure reducer operation gas path; and when the numerical value of the fifth pressure gauge is greater than a preset pressure value, the ninth stop valve is opened and is used for controlling the air passage of the pneumatic pressure reducer to deflate and release the pressure.

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