Recoverable and reusable rocket high-flow high-pressure reducing valve test system and method

Abstract

The invention discloses a recyclable and reusable rocket large-flow high-pressure reducing valve test system and method. The test system comprises a high-pressure gas source and a main system pipeline communicated with the high-pressure gas source, and the main system pipeline is communicated with the main test area system, the vibration test subsystem and the environment high-temperature test subsystem. According to the invention, a large-flow high-pressure reducing valve comprehensive test under multiple environment working conditions such as normal temperature, vibration, high temperature and low temperature can be completed on a unified platform, test conditions are close to actual working conditions, measurement means are complete, and the test platform is suitable for performance verification of recyclable and reusable rocket key valves.

Description

Technical Field

[0001] This invention belongs to the field of spacecraft recovery technology, and relates to a test system and method for a reusable rocket high-flow-rate high-pressure pressure reducing valve. Background Technology

[0002] Conventional, non-reusable multi-stage launch vehicles are currently the primary means of space launches. However, these launch vehicles suffer from drawbacks such as high manufacturing and launch costs and long production cycles. Their limitations are becoming increasingly prominent in today's booming space industry, failing to meet the demands for convenient access to space. As global competition in rocket technology intensifies, only SpaceX in the United States has taken the lead in the field of reusable rockets, and its Falcon series rockets were the first to be used in actual satellite launches, significantly reducing space launch costs and increasing launch frequency.

[0003] With the increasing number of space launch missions in my country and the fierce competition between domestic and international reusable technologies, my country urgently needs to utilize mature spacecraft launch and recovery technologies in its actual missions. Attitude adjustment is a crucial step in the spacecraft recovery process, where pressure relief valves and related devices utilize controlled high-pressure, high-flow-rate gas for attitude adjustment. There are no precedents for using pressure relief valves for spacecraft attitude adjustment in China, and there are no reference points for the performance and parameters of pressure relief valves used in reusable spacecraft. Therefore, ground tests are needed to verify that the performance and parameter specifications of the pressure relief valves used for spacecraft recovery and adjustment meet the requirements.

[0004] Existing testing methods are insufficient to simultaneously cover various operating conditions such as high pressure, large flow rate, vibration environment, high and low temperature environment, and lifespan. They cannot complete comprehensive testing of pressure reducing valve flow rate, outlet pressure, control pressure, as well as operational flexibility, external leakage, and environmental resistance performance on a unified platform, thus failing to meet the performance verification requirements of key valves for reusable rockets. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and propose a test system and method for a reusable rocket high-flow-rate high-pressure pressure reducing valve. This system provides the pressure reducing valve with various test conditions, including normal temperature, vibration, high and low temperatures, and lifespan. Through a unified test method, it achieves comprehensive testing of the pressure reducing valve's flow rate, outlet pressure, control pressure, external airtightness, and environmental adaptability.

[0006] To achieve the above objectives, the present invention employs the following technical solutions: A test system for a reusable rocket high-flow-rate high-pressure pressure reducing valve includes a high-pressure gas source and a main system pipeline connected to the high-pressure gas source. The main system pipeline is connected to a main test area system, a vibration test subsystem, and an environmental high-temperature test subsystem. The main system pipeline is used to supply the test medium to the test system and adjust the pressure and flow rate of the test medium. The main test area system is used to arrange the pressure reducing valve under test under normal temperature conditions and to test the pressure reducing valve under test. The vibration test subsystem is used to test the pressure reducing valve under test under vibration environment. The environmental high temperature test subsystem is used to test the pressure reducing valve under test under high temperature environment. Pressure measuring elements and temperature measuring elements are installed at the inlet and outlet of the pressure reducing valve under test to collect pressure and temperature data at the inlet and outlet. The system is configured to provide the pressure reducing valve under test with normal temperature, vibration and high temperature test conditions within the range of 0-42MPa gas pressure and 5kg / s standard nitrogen flow rate.

[0007] As a preferred embodiment, the main system pipeline includes a high-pressure gas cylinder group, a manual shut-off valve, a filter, and a pipeline pressure reducing valve connected in sequence, and pressure gauges and pressure transmitters are installed at different locations in the main system pipeline to monitor the pressure of the high-pressure gas source and the pipeline pressure supplying gas to each test subsystem.

[0008] As a preferred embodiment, the main test area system includes: a pipe section along the main system pipeline for installing the pressure reducing valve to be tested; a test solenoid valve and a flow limiting nozzle connected to the inlet and outlet sides of the pipe section; and a pressure transmitter and a temperature transmitter arranged at the inlet and outlet sides of the pipe section. The main test area system is used to test the pressure reducing valve under test at room temperature and to collect the pressure and temperature curves at the inlet and outlet of the pressure reducing valve under test.

[0009] As a preferred embodiment, the vibration test subsystem includes: a vibration test branch connected to the main system pipeline; a vibration table and a clamping structure for mounting the pressure reducing valve under test on the vibration test branch; a shut-off valve and a test solenoid valve for controlling the flow of the medium in the vibration test branch; and pressure transmitters arranged at the inlet and outlet of the pressure reducing valve under test on the vibration table. The vibration test subsystem is used to perform an operation test on the pressure reducing valve under test and collect its inlet and outlet pressure curves under vibration conditions in the X, Y, and Z directions of the vibration table.

[0010] As a preferred embodiment, the main test area system is also provided with a low-temperature test branch, which includes a circulating cooling device, branches for introducing room temperature medium and low temperature medium respectively, and a proportional switch solenoid valve installed in the branch. The proportional switch solenoid valve is used to adjust the mixing ratio of the ambient temperature medium and the low temperature medium. The temperature transmitters installed at the inlet and outlet of the pressure reducing valve under test are used to collect the inlet and outlet temperatures of the pressure reducing valve under test in a low temperature environment, so as to conduct a low temperature start-up characteristic test.

[0011] As a preferred embodiment, the environmental high-temperature test subsystem includes a high-temperature test chamber, in which the pressure reducing valve to be tested is placed; a shut-off valve for controlling the on / off of the medium and a test solenoid valve are provided in the test branch connected to the high-temperature test chamber, and pressure transmitters are provided at the inlet and outlet of the pressure reducing valve to be tested for pressure characteristic test and start-up characteristic test of the pressure reducing valve to be tested in a high-temperature environment.

[0012] This invention also discloses a test method using a reusable rocket high-flow-rate high-pressure pressure reducing valve test system, comprising the following steps: S1. Initial preparation: In the initial state, open some of the shut-off valves in the main system pipeline and close the remaining components. Check whether the high-pressure gas source pressure meets the test requirements by using the pressure gauge set on the gas source side. S2. Establish test conditions: According to the predetermined test items, by controlling the opening and closing states of the manual shut-off valves, electric shut-off valves, proportional switch solenoid valves and test solenoid valves in the main system pipeline, main test area system, vibration test branch, low temperature test branch and environmental high temperature test subsystem, and adjusting the outlet pressure of the pilot pressure reducing valve and pipeline pressure reducing valve, the inlet pressure, outlet pressure and medium temperature of the pressure reducing valve under test are made to reach the working conditions required by the corresponding test items. S3. Data Acquisition: Under the test conditions, drive the pressure reducing valve under test to operate, and use pressure transmitters and temperature transmitters arranged at the inlet and outlet of the pressure reducing valve under test to collect the change curves of inlet pressure, outlet pressure, inlet temperature and outlet temperature. S4. Performance Evaluation: Based on the collected pressure and temperature data, evaluate one or more of the following characteristics of the pressure reducing valve under test: flow characteristics, pressure characteristics, start-up characteristics, external air tightness, operational reliability under vibration environment, low temperature start-up characteristics, lifespan characteristics, limiting flow characteristics, high temperature pressure characteristics, or high temperature start-up characteristics.

[0013] As a preferred method, the high-flow-rate operation test includes: closing the electric shut-off valve connected to the main system pipeline, opening several manual shut-off valves in the main test area system, adjusting the pilot pressure reducing valve and the pipeline pressure reducing valve to make the main system pipeline pressure reach the predetermined test pressure, and confirming that the pressure is normal by using a pressure gauge; repeatedly opening and closing the test solenoid valve arranged at the inlet of the pressure reducing valve under test, so that the pressure reducing valve under test operates multiple times under high-flow-rate conditions, and using pressure transmitters arranged at the inlet and outlet of the pressure reducing valve under test to collect the inlet pressure and outlet pressure curves, and determining whether there are abnormal vibrations and noises in the pressure reducing valve under test during the operation.

[0014] As a preferred method, the low-temperature start-up characteristic test includes: opening the manual shut-off valves and proportional switch solenoid valves installed on the normal temperature medium branch and the low temperature medium branch; adjusting the pilot pressure reducing valve and the pipeline pressure reducing valve to maintain the main system pipeline pressure within the range of 1-4 MPa; performing displacement pre-cooling of the system by repeatedly opening and closing the test solenoid valve arranged at the inlet of the pressure reducing valve under test; injecting liquid nitrogen into the circulating cooling device and continuing to intermittently vent through the test solenoid valve to reduce the medium temperature to the predetermined test temperature; then adjusting the main system pipeline pressure back to the test pressure; cyclically opening and closing the test solenoid valve to reduce the inlet pressure of the pressure reducing valve under test from the test pressure to the specified pressure; and simultaneously collecting the inlet pressure, outlet pressure, inlet temperature, and outlet temperature change curves using pressure transmitters and temperature transmitters arranged at the inlet and outlet of the pressure reducing valve under test.

[0015] The present invention has the following advantages: The test system of this invention can provide test conditions for aerospace valves under gas pressure of 0~42MPa and 5kg / s (standard nitrogen). The test system can meet the requirements of vibration environment and high and low temperature environment simulation. Through simulated conditions, the flow rate, outlet pressure and control pressure of pressure reducing valve can be measured by test methods. The system can also test the overall pressure resistance, operation flexibility and shock vibration resistance of pressure reducing valve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the experimental system of the present invention. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings.

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] Example: This embodiment of the reusable rocket high-flow-rate high-pressure pressure reducing valve test system includes a high-pressure gas source, main system pipelines, main test area system, vibration test subsystem, and environmental high-temperature test subsystem. This test system can perform high-flow-rate operation tests, pressure characteristic tests, start-up characteristic tests, ambient temperature external airtightness tests, vibration tests, low-temperature start-up characteristic tests, life tests, ultimate flow rate tests, high-temperature start-up characteristic tests, and high-temperature pressure characteristic tests on the pressure reducing valve. The test system and test methods are reliable and can fully verify the performance of the pressure reducing valve.

[0020] The preferred high-pressure gas source is a high-pressure gas cylinder assembly, which supplies gas to each test subsystem through the main system pipeline. The main system pipeline sequentially includes the high-pressure gas cylinder assembly, manual shut-off valve, filter, and pipeline pressure reducing valve. Pressure gauges and pressure transmitters are installed at different locations along the main system pipeline to monitor the high-pressure gas source pressure and the pipeline pressure supplied to each subsystem. The main system pipeline can adjust the supply pressure and flow rate as needed to provide the required operating conditions for subsequent tests.

[0021] The main test area system includes a pipe section along the main system piping for installing the pressure-reducing valve under test. A test solenoid valve and a flow-limiting nozzle are installed on the inlet and outlet sides of this pipe section, respectively. The opening and closing of the pressure-reducing valve under test and the flow rate are controlled by opening and closing the solenoid valve. The flow characteristics are changed by adjusting the orifice diameter or number of flow-limiting nozzles. Pressure transmitters and temperature transmitters are respectively installed on the inlet and outlet sides of this pipe section to collect real-time pressure and temperature data at the inlet and outlet of the pressure-reducing valve under test.

[0022] A low-temperature test branch is set up in the main test area system. This branch includes a circulating cooling device and separate branches for introducing room temperature and low-temperature media. Proportional switching solenoid valves are installed in these branches. By changing the opening degree of these valves, the mixing ratio of the room temperature and low-temperature media can be adjusted. Temperature transmitters monitor the inlet and outlet temperatures of the pressure reducing valve under test, enabling the system to operate under low-temperature conditions within a certain range, thus providing conditions for low-temperature start-up characteristic testing.

[0023] The vibration testing subsystem is connected to the main system pipeline via a vibration testing branch. A vibration table and a clamping structure for mounting the pressure-reducing valve under test are installed on this branch. The vibration testing branch includes a shut-off valve for controlling the flow of the medium and a test solenoid valve. Pressure transmitters are placed at the inlet and outlet of the pressure-reducing valve under test on the vibration table to perform operational tests on the valve under test and collect its inlet and outlet pressure curves under the vibration conditions provided by the vibration table in the X, Y, and Z directions.

[0024] The high-temperature environmental testing subsystem includes a high-temperature test chamber, inside which the pressure-reducing valve under test is installed. A shut-off valve for controlling the flow of the medium and a test solenoid valve are installed in the test branch connected to the high-temperature test chamber, and pressure transmitters are installed at the inlet and outlet of the pressure-reducing valve under test. By heating and insulating the high-temperature test chamber, the pressure-reducing valve under test is placed in a high-temperature environment. With the adjustment of the test solenoid valve and the pipeline pressure-reducing valve, pressure characteristic tests and start-up characteristic tests can be conducted under high-temperature conditions.

[0025] The specific steps for conducting experiments using the above-mentioned experimental system are as follows: S1: In the initial state, the shut-off valves (43, 16, 45) are open, and all other components are closed. Before the test, check the air source pressure gauge (1) to determine whether the air source pressure meets the test requirements.

[0026] S2: High-flow-rate test of pressure reducing valve. Close the electric shut-off valve (16, 43), open the shut-off valve (2, 8, 11, 22, 29), adjust the pilot pressure reducing valve (4) to adjust the pressure of the pipeline pressure reducing valve (5) to the test pressure, observe whether the pressure gauge (6) is normal, repeatedly open and close the test solenoid valve (37) in front of the pressure reducing valve (25Ⅰ) of the test product, with an opening time of 10s and a closing time of 5s, for a total of three times. During the test, judge whether there is any abnormal vibration or noise of the pressure reducing valve (25Ⅰ) of the test product. Use pressure transmitters (24, 26) to collect the inlet and outlet pressure curves of the pressure reducing valve (25), read the inlet and outlet pressures, and reset the shut-off valve after the test.

[0027] S3: Pressure characteristic test of pressure reducing valve. Close the electric shut-off valve (16, 43), open the shut-off valve (2, 8, 11, 22, 29), adjust the pilot pressure reducing valve (4) to adjust the pressure of the pipeline pressure reducing valve (5) to the test pressure, observe whether the pressure gauge (6) is normal, open the shut-off valve (12) to fill the gas cylinder group with gas, after the filling is completed, close the shut-off valve (8) and open the test solenoid valve (37) before the pressure reducing valve (25Ⅰ) of the test product. The inlet pressure of the pressure reducing valve (25Ⅰ) of the test product drops from the test pressure to the specified pressure. Use the pressure transmitter (24, 26) to collect the inlet and outlet pressure curves of the pressure reducing valve (25Ⅰ) of the test product, read the inlet and outlet pressures, and reset the shut-off valve after the test.

[0028] S4: Pressure reducing valve start-up characteristic test. Close the electric shut-off valve (16, 43), open the shut-off valve (2, 8, 11, 22, 29), adjust the pilot pressure reducing valve (4) to adjust the pressure of the pipeline pressure reducing valve (5) to the test pressure, observe whether the pressure gauge (6) is normal, open the shut-off valve (12) to fill the gas cylinder group with gas, after the filling is completed, close the shut-off valve (8), open the test solenoid valve (37) before the pressure reducing valve (25Ⅰ) of the test product, set the action sequence of the solenoid valve (21) to open for 0.5s each time, close for 2s each time and cycle until the inlet pressure of the pressure reducing valve (25Ⅰ) of the test product drops to the specified pressure, use the pressure transmitter (24, 26) to collect the inlet and outlet pressure curves of the pressure reducing valve (25Ⅰ) of the test product, read the inlet and outlet pressure, and reset the shut-off valve after the test.

[0029] S5: For the room temperature external air tightness test of the pressure reducing valve, close the electric shut-off valve (16, 43), open the shut-off valve (2, 8, 11, 22, 29), adjust the pilot pressure reducing valve (4) to adjust the pressure of the pipeline pressure reducing valve (5) to the test pressure, observe whether the pressure gauge (6) is normal, close the shut-off valve (29), open the test solenoid valve (37) before the pressure reducing valve (25Ⅰ) of the test product to check the external air tightness of the left end of the pressure reducing valve (25Ⅰ) of the test product, and reset the shut-off valve after the test.

[0030] S6: Vibration test of pressure reducing valve. Close the electric shut-off valve (16, 43), open the manual shut-off valve (2, 8, 11, 30), turn on the vibration test bench (33) and test according to the vibration test conditions. During the vibration test, repeatedly open and close the solenoid valve (37) in front of the pressure reducing valve (25Ⅱ) of the test product, with an opening time of 10s and a closing time of 5s, for a total of three times. During the test, judge whether the pressure reducing valve (25Ⅱ) of the test product can open and close normally, move flexibly, and should not have any jamming. Use pressure transmitters (32, 34) to collect the inlet and outlet pressure curves of the pressure reducing valve (25Ⅱ) of the test product and read the inlet and outlet pressures. Adjust the pressure reducing valve (25Ⅱ) of the test product in the X, Y, and Z directions, and repeat the above test once for each direction. After the test, reset the shut-off valve.

[0031] S7: Low-temperature start-up characteristic test of pressure reducing valve. Close the electric shut-off valve (16, 43), open the manual shut-off valve (2, 8, 22, 29), and the proportional switch solenoid valve (10, 11). Adjust the pilot pressure reducing valve (4) to make the pipeline pressure reducing valve (5) adjust the pressure to 1~4MPa. Open the test solenoid valve (37) before the pressure reducing valve (25Ⅰ) of the test product, release the gas for 3s and then close it. Repeat the operation 5 times to fully replace and pre-cool the system. Close the electric shut-off valve (11), add liquid nitrogen into the circulating cooling device (15), open the test solenoid valve (37) before the pressure reducing valve (25Ⅰ) of the test product, release the gas for 3s and then close it. Repeat the operation 5 times. Use the temperature transmitter (19, 23, 27) to collect the medium temperature, adjust the opening of the proportional switch solenoid valve (10, 11), and adjust the mixing ratio of the normal temperature medium and the low temperature medium so that the inlet temperature and outlet temperature of the pressure reducing valve (25Ⅰ) of the test product reach the test temperature. The test system is cooled down. Adjust the pilot pressure reducing valve (4) to adjust the pressure of the pipeline pressure reducing valve (5) to the test pressure. Cyclicly open the test solenoid valve (37) before the pressure reducing valve (25Ⅰ) of the test product, with an opening time of 2~3s and a closing time of 3~5s. The inlet pressure of the pressure reducing valve (25Ⅰ) of the test product drops from the test pressure to the specified pressure. Use pressure transmitters (24, 26) to collect the inlet and outlet pressure curves of the pressure reducing valve (25Ⅰ) of the test product, and use temperature transmitters (23, 27) to collect the inlet and outlet temperature curves. Read the inlet and outlet pressure and temperature. After the test, reset the shut-off valve.

[0032] S8: Pressure reducing valve life test. Close the electric shut-off valve (16, 43), open the shut-off valve (2, 8, 11, 22, 29), adjust the pilot pressure reducing valve (4) to adjust the pressure of the pipeline pressure reducing valve (5) to the test pressure, and observe whether the pressure gauge (6) is normal. ① Small flow life test. Open the shut-off valve (12) to fill the gas cylinder group with gas. After the filling is completed, close the shut-off valve (8), open the test solenoid valve (37) in front of the pressure reducing valve (25Ⅰ) of the test product, set the action sequence of the solenoid valve (21) to open for 0.5s and close for 2s each time, and cycle until the inlet pressure of the pressure reducing valve (25Ⅰ) of the test product drops to the specified pressure. Then open the shut-off valve (8) to fill the gas cylinder. After the filling is completed, close the shut-off valve (8). The solenoid valve (21) continues to cycle open and close to reach the life set number of times. Use pressure transmitters (24, 26) to collect the inlet and outlet pressure curves of the pressure reducing valve (25Ⅰ) of the test product, and read the inlet and outlet pressures. After each 500-cycle life test, a pressure characteristic test and a pneumatic characteristic test of the pressure reducing valve are performed; ② Large flow life test, the solenoid valve (37) before the pressure reducing valve (25Ⅰ) of the test product reaches the required number of life cycles, the opening time is 0.5s and the closing time is 2s. During the test, it is judged whether there is any abnormal vibration or noise of the pressure reducing valve (25Ⅰ) of the test product. The pressure transmitters (24, 26) are used to collect the inlet and outlet pressure curves of the pressure reducing valve (25Ⅰ) of the test product and read the inlet and outlet pressures. After each 500-cycle life test, a pressure characteristic test and a pneumatic characteristic test of the pressure reducing valve are performed. After the test, the shut-off valve is reset.

[0033] S9: Limit flow test. Replace the flow-limiting nozzle (28) with one of different specifications and diameters. Close the electric shut-off valve (16, 43) and open the shut-off valve (2, 8, 11, 22, 29). Adjust the pilot pressure reducing valve (4) to adjust the pressure of the pipeline pressure reducing valve (5) to the test pressure. Observe whether the pressure gauge (6) is normal. Repeatedly open and close the test solenoid valve (37) in front of the pressure reducing valve (25Ⅰ) of the test product. The opening time is 10s and the closing time is 5s, for a total of three times. During the test, judge whether the pressure reducing valve (25Ⅰ) of the test product has abnormal vibration and noise. Use pressure transmitters (24, 26) to collect the inlet and outlet pressure curves of the pressure reducing valve (25Ⅰ) of the test product, read the inlet and outlet pressures, and reset the shut-off valve after the test.

[0034] S10: High temperature pressure characteristic test. Install the pressure reducing valve (25Ⅲ) of the test product in the high temperature test chamber (44), set the temperature and start heating. When the temperature reaches the set temperature, keep it warm for 0.5h, close the electric shut-off valve (16, 43), open the shut-off valve (2, 8, 42), adjust the pilot pressure reducing valve (4) to adjust the pressure of the pipeline pressure reducing valve (5) to the test pressure, observe whether the pressure gauge (6) is normal, open the shut-off valve (12) to fill the gas cylinder group with gas, after the gas filling is completed, close the shut-off valve (8) and open the test solenoid valve (37) before the pressure reducing valve (25Ⅲ) of the test product. The inlet pressure of the pressure reducing valve (25Ⅲ) of the test product drops from the test pressure to the specified pressure. Use the pressure transmitter (38, 40) to collect the inlet and outlet pressure curves of the pressure reducing valve (25Ⅲ) of the test product, read the inlet and outlet pressures, and reset the shut-off valve after the test.

[0035] S11: High temperature start-up characteristic test. Install the pressure reducing valve (25Ⅲ) of the test product in the high temperature test chamber (44), set the temperature and start heating. When the temperature reaches the set temperature, keep it warm for 0.5h, close the electric shut-off valve (16, 43), open the shut-off valve (2, 8, 42), adjust the pilot pressure reducing valve (4) to adjust the pressure of the pipeline pressure reducing valve (5) to the test pressure, observe whether the pressure gauge (6) is normal, open the shut-off valve (12) to fill the gas cylinder group with gas, after the gas filling is completed, close the shut-off valve (8), open the test solenoid valve (37) in front of the pressure reducing valve (25Ⅲ) of the test product, set the action sequence of the test solenoid valve (37) to open for 0.5s each time, close for 2s each time and cycle until the inlet pressure of the pressure reducing valve (25Ⅲ) of the test product drops to the specified pressure, use the pressure transmitter (38, 40) to collect the inlet and outlet pressure curves of the pressure reducing valve (25Ⅲ) of the test product, read the inlet and outlet pressure, and reset the shut-off valve after the test.

[0036] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A reusable and recyclable rocket high-flow-rate high-pressure pressure reducing valve test system, characterized in that, include: A high-pressure gas source and a main system pipeline connected to the high-pressure gas source, wherein the main system pipeline is respectively connected to the main test area system, the vibration test subsystem, and the environmental high temperature test subsystem; The main system pipeline is used to supply the test medium to the test system and adjust the pressure and flow rate of the test medium. The main test area system is used to arrange the pressure reducing valve under test under normal temperature conditions and to test the pressure reducing valve under test. The vibration test subsystem is used to test the pressure reducing valve under test under vibration environment. The environmental high temperature test subsystem is used to test the pressure reducing valve under test under high temperature environment. Pressure measuring elements and temperature measuring elements are installed at the inlet and outlet of the pressure reducing valve under test to collect pressure and temperature data at the inlet and outlet. The system is configured to provide the pressure reducing valve under test with normal temperature, vibration and high temperature test conditions within the range of 0-42MPa gas pressure and 5kg / s standard nitrogen flow rate.

2. The test system for a reusable, high-flow-rate, high-pressure pressure reducing valve for rockets according to claim 1, characterized in that: The main system pipeline includes a high-pressure gas cylinder group, a manual shut-off valve, a filter, and a pipeline pressure reducing valve connected in sequence. Pressure gauges and pressure transmitters are installed at different locations in the main system pipeline to monitor the pressure of the high-pressure gas source and the pipeline pressure supplying gas to each test subsystem.

3. The test system for a reusable, high-flow-rate, high-pressure pressure-reducing valve for rockets according to claim 1, characterized in that, The main test area system includes: a pipe section along the main system pipeline for installing the pressure reducing valve to be tested; a test solenoid valve and a flow limiting nozzle connected to the inlet and outlet sides of the pipe section; and a pressure transmitter and a temperature transmitter arranged at the inlet and outlet sides of the pipe section. The main test area system is used to test the pressure reducing valve under test at room temperature and to collect the pressure and temperature curves at the inlet and outlet of the pressure reducing valve under test.

4. The test system for a reusable, high-flow-rate, high-pressure pressure reducing valve for rockets according to claim 1, characterized in that: The vibration test subsystem includes: a vibration test branch connected to the main system pipeline; a vibration table and a clamping structure for mounting the pressure reducing valve under test on the vibration test branch; a shut-off valve and a test solenoid valve for controlling the flow of the medium in the vibration test branch; and pressure transmitters arranged at the inlet and outlet of the pressure reducing valve under test on the vibration table. The vibration test subsystem is used to perform an operation test on the pressure reducing valve under test and collect its inlet and outlet pressure curves under vibration conditions in the X, Y, and Z directions of the vibration table.

5. The test system for a reusable, high-flow-rate, high-pressure pressure reducing valve for rockets according to claim 1, characterized in that: The main test area system is also equipped with a low-temperature test branch, which includes a circulating cooling device, branches for introducing room temperature medium and low temperature medium respectively, and a proportional switch solenoid valve installed in the branch. The proportional switch solenoid valve is used to adjust the mixing ratio of the ambient temperature medium and the low temperature medium. The temperature transmitters installed at the inlet and outlet of the pressure reducing valve under test are used to collect the inlet and outlet temperatures of the pressure reducing valve under test in a low temperature environment, so as to conduct a low temperature start-up characteristic test.

6. The test system for a reusable, high-flow-rate, high-pressure pressure reducing valve for rockets according to claim 1, characterized in that: The environmental high temperature test subsystem includes a high temperature test chamber, in which the pressure reducing valve under test is installed; a shut-off valve and a test solenoid valve for controlling the on / off of the medium are installed in the test branch connected to the high temperature test chamber, and pressure transmitters are installed at the inlet and outlet of the pressure reducing valve under test for pressure characteristic test and start-up characteristic test of the pressure reducing valve under test in a high temperature environment.

7. A test method using the reusable rocket high-flow-rate high-pressure pressure reducing valve test system as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Initial preparation: In the initial state, open some of the shut-off valves in the main system pipeline and close the remaining components. Check whether the high-pressure gas source pressure meets the test requirements by using the pressure gauge set on the gas source side. S2. Establish test conditions: According to the predetermined test items, by controlling the opening and closing states of the manual shut-off valves, electric shut-off valves, proportional switch solenoid valves and test solenoid valves in the main system pipeline, main test area system, vibration test branch, low temperature test branch and environmental high temperature test subsystem, and adjusting the outlet pressure of the pilot pressure reducing valve and pipeline pressure reducing valve, the inlet pressure, outlet pressure and medium temperature of the pressure reducing valve under test are made to reach the working conditions required by the corresponding test items. S3. Data Acquisition: Under the test conditions, drive the pressure reducing valve under test to operate, and use pressure transmitters and temperature transmitters arranged at the inlet and outlet of the pressure reducing valve under test to collect the change curves of inlet pressure, outlet pressure, inlet temperature and outlet temperature. S4. Performance Evaluation: Based on the collected pressure and temperature data, evaluate one or more of the following characteristics of the pressure reducing valve under test: flow characteristics, pressure characteristics, start-up characteristics, external air tightness, operational reliability under vibration environment, low temperature start-up characteristics, lifespan characteristics, limiting flow characteristics, high temperature pressure characteristics, or high temperature start-up characteristics.

8. The test method according to claim 7, characterized in that, The high-flow-rate operation test includes: Close the electric shut-off valve connected to the main system pipeline, open several manual shut-off valves in the main test area system, adjust the pilot pressure reducing valve and pipeline pressure reducing valve to make the main system pipeline pressure reach the predetermined test pressure, and confirm that the pressure is normal by using a pressure gauge; repeatedly open and close the test solenoid valve arranged at the inlet of the pressure reducing valve under test, so that the pressure reducing valve under test can be operated multiple times under high flow conditions, and use pressure transmitters arranged at the inlet and outlet of the pressure reducing valve under test to collect the inlet pressure and outlet pressure curves to determine whether there is abnormal vibration and noise during the operation of the pressure reducing valve under test.

9. The test method according to claim 7, characterized in that, The low-temperature start-up characteristic test includes: opening the manual shut-off valves and proportional switch solenoid valves installed on the normal temperature medium branch and the low temperature medium branch; adjusting the pilot pressure reducing valve and the pipeline pressure reducing valve to maintain the main system pipeline pressure within the range of 1-4 MPa; performing displacement pre-cooling of the system by repeatedly opening and closing the test solenoid valve arranged at the inlet of the pressure reducing valve under test; injecting liquid nitrogen into the circulating cooling device and continuing to intermittently vent through the test solenoid valve to reduce the medium temperature to the predetermined test temperature; then adjusting the main system pipeline pressure back to the test pressure; cyclically opening and closing the test solenoid valve to reduce the inlet pressure of the pressure reducing valve under test from the test pressure to the specified pressure; and simultaneously collecting the inlet pressure, outlet pressure, inlet temperature, and outlet temperature change curves using pressure transmitters and temperature transmitters arranged at the inlet and outlet of the pressure reducing valve under test.

Images