Aircraft oxygen system anti-ignition test comprehensive test device and method

Abstract

The application discloses an aircraft oxygen system anti-ignition test comprehensive test device and method. The device comprises oxygen source oxygen (1), the oxygen source oxygen (1) is connected with the oxygen inlet (13) of the test piece (14) through the gas supply valve (2), the pipeline A (3), the high-pressure container (5) and the pipeline B (10) in sequence, and the test piece (14) is further connected with the exhaust valve (12). The high-pressure container (5) is provided with a temperature control device (4) outside, the temperature control device (4) and the high-pressure container (5) are provided with a water bath heating environment between the layers, and the test piece (14) is further provided with a safety explosion-proof device (15). The application can solve the problems of great difficulty in manual operation test, great test data and high test risk in the anti-ignition test of the oxygen system, and improve the test safety and convenience.

Description

Technical Field

[0001] This invention belongs to the field of aircraft oxygen system technology, and particularly relates to a comprehensive test device and method for ignition resistance testing of aircraft oxygen systems. Background Technology

[0002] The aircraft oxygen system provides normal or emergency breathing oxygen for the crew and emergency oxygen supply for passengers. The oxygen system consists of an oxygen source, a control and distribution system, and oxygen masks. The oxygen source typically uses high-pressure gaseous oxygen, stored in high-pressure oxygen cylinders. After the oxygen switch (integrated on the oxygen cylinder pressure reducer or a separate oxygen switch) is turned on, the oxygen in the high-pressure cylinder is depressurized and supplied to the crew through pipelines. When the oxygen level in the cylinder falls below a certain value, it needs to be refilled. During refilling, the oxygen cylinder's refill port and the high-pressure section of the oxygen system will be subjected to repeated impacts from high-pressure oxygen. If the pressure output at the low-pressure end is not constant, its downstream end will be subjected to repeated oxygen pressure impacts. Since oxygen is a strong oxidant, from a safety perspective, the impact of oxygen pressure impacts on the safety of the oxygen system should be considered, particularly regarding the risk of ignition during pressure impacts on the oxygen pressure reducer and refill port, which are frequently subjected to impacts. This is referred to as the ignition resistance test. According to the HB7588-1998 "General Specification for Oxygen Switches" standard, oxygen switches need to undergo oxygen impact tests. The standard only requires that after an impact of 30ms and a holding time of 30s, the product should show no signs of ignition or carbonization. Therefore, the equipment used in China is relatively simple. As aircraft have increasingly higher requirements for system safety, the anti-ignition test will become more and more stringent. The anti-ignition test has extremely stringent requirements in five aspects: high impact pressure (not less than 1.2 times the normal operating pressure of the gas cylinder), constant temperature and pressure of the gas source, extremely short impact time during the ascent phase (15-20ms), extremely high fire risk of the impact medium (pure oxygen with a purity greater than 99.5%), and a large number of impacts (one impact cycle of 30s). At the same time, during a single impact test, there are five extremely stringent requirements: maintaining gas supply for a short period of time (3s), maintaining the pressure of the test piece for 3s after venting the pressure, maintaining the pressure for 30s in one impact cycle, and 20 consecutive impacts. In addition, the connection between the opening and closing states of each valve and the precise control of the test duration at each stage pose great challenges to operators, test equipment and test pieces. Currently, the conventional testing method involves manually adjusting the gas supply pressure. If the supply pressure is too low, the test data will be invalid; if the supply pressure is too high, the test specimen will be subjected to stricter testing, potentially leading to test failure. Furthermore, the impact time is extremely short and the tolerance range is very small, requiring precise control of the testing equipment and gas supply pressure. Regarding safety, conventional ignition resistance tests are usually conducted in open outdoor spaces, lacking adequate explosion-proof measures and safety protection for personnel. These tests are typically conducted by manually adjusting the impact pressure, which makes safety difficult to guarantee, and the manual operation is extremely challenging. Regarding the determination of test data validity, the test data and validity cannot be determined during the test. Only after the test is completed and data analysis is performed to determine the test's validity and whether supplementary tests are needed.Regarding test data processing, the impact time during the rise phase (15-20ms) is one of the criteria for test qualification. The test equipment must collect test data at a frequency greater than 500Hz. After one impact, the amount of impact time data alone is as high as 30,000. After one test piece completes 60 impacts, the amount of data reaches as high as 1,800,000. There are at least four criteria for judging whether a single ignition resistance test is effective. The ignition resistance test needs to be carried out on a total of three test pieces. Manual control also leads to a large number of invalid test data. In summary, the manual operation of the test is extremely difficult, and the risks faced by the test personnel during the test are extremely high. After the test, it is impossible to judge the validity of the test in time and to carry out supplementary tests due to invalid test data after data processing and analysis, which increases the test progress and test time. At the same time, the entire ignition resistance test has many problems such as an extremely large amount of data and extremely difficult manual data processing. Summary of the Invention

[0003] This invention provides a comprehensive testing apparatus and method for ignition resistance testing of aircraft oxygen systems. This invention solves the problems of extremely high difficulty in manual operation, large and difficult-to-process test data, and high testing risks in current oxygen system ignition resistance testing, thereby improving testing safety and convenience.

[0004] Technical Solution. A comprehensive test apparatus for ignition resistance testing of an aircraft oxygen system includes an oxygen source, which is connected sequentially to the oxygen filling port of a test specimen via a gas supply valve, pipeline A, a high-pressure container, and pipeline B. The test specimen is also connected to an exhaust valve. A temperature control device is installed around the high-pressure container, and a water bath heating environment is provided between the temperature control device and the high-pressure container. A safety explosion-proof device is also installed around the test specimen. A quick-opening valve is installed on pipeline B. An impact pressure measurement and control device is installed on pipeline B between the quick-opening valve and the oxygen filling port. The temperature control device includes a temperature measurement and display device for monitoring the temperature of the high-pressure container and a gas source pressure measurement and control device for monitoring the pressure of the high-pressure container. The gas supply valve, temperature control device, temperature measurement and display device, gas source pressure measurement and control device, quick-opening valve, impact pressure measurement and control device, and exhaust valve are all electrically connected to the comprehensive ignition resistance testing apparatus.

[0005] The aforementioned integrated test apparatus for aircraft oxygen system ignition resistance testing includes an integrated processing unit for ignition resistance testing, comprising: The data acquisition module is used to collect data on temperature, on / off status, flow rate, and pressure. The integrated processing module is used to record the opening and closing times of each valve and the corresponding time of each pressure data from the impact pressure measurement and control device. The integrated display module is used to display the gas temperature and pressure data inside the high-pressure vessel, the remaining number of impacts and the total number of impacts, and the pressure impact waveform received by the impact pressure measurement and control device, providing a user-friendly monitoring screen for monitoring personnel. The control output module is used for the switching and flow control of gas supply valves, quick-opening valves and exhaust valves, and temperature control devices.

[0006] In the aforementioned integrated test device for aircraft oxygen system anti-ignition testing, the pressure data acquisition frequency is no less than one data point per 1ms.

[0007] In the aforementioned integrated test device for the anti-ignition test of the aircraft oxygen system, a heat insulation device is provided at the temperature measurement and display device.

[0008] In the aforementioned integrated test device for the anti-ignition test of the aircraft oxygen system, the impact pressure measurement and control device and pipeline A are respectively equipped with electrostatic protection device A and electrostatic protection device B.

[0009] In the aforementioned integrated test device for the anti-ignition test of the aircraft oxygen system, both pipe A and pipe B are copper pipes.

[0010] In the aforementioned comprehensive test device for the anti-ignition test of the aircraft oxygen system, a remote monitoring camera is installed inside the safety explosion-proof device.

[0011] A test control method for an integrated test apparatus for anti-ignition testing of an aircraft oxygen system, as described above, is as follows: At the start of the test, the integrated anti-ignition test apparatus opens a quick-opening valve, allowing high-speed oxygen to enter the test specimen through its oxygen filling port. The impact time lasts 3-5 seconds. The integrated anti-ignition test apparatus records the opening time T1, closing time T2, and gas mass flow rate L2 through the quick-opening valve. After the impact, the integrated anti-ignition test apparatus opens the supply valve and exhaust valve, recording the opening time T3, closing time T4, and mass flow rate L2 through the supply valve, the opening time T5, and closing time T6 of the exhaust valve, the impact pressure on the test specimen, and the moment T7 when the impact pressure exceeds the preset pressure P. Record the first peak pressure greater than P, P2; record the time T8 when it reaches 0.1P2; record the time T9 when it reaches 0.9P2; record the critical time T10 when the impact pressure drops to P; record the time T11 when the pressure monitoring device reaches 0, and control 5s≥T2-T1>3s, T9-T8≤20ms, the pressure holding time inside the test piece T7≥3s, and T11-T1<27s; after the pressure impact, proceed to replenish gas to the high-pressure vessel and release the pressure inside the test piece, T3>T2, replenish gas as slowly as possible, satisfying 27s>T4-T3≥3s, the time when the pressure inside the test piece reaches 0 satisfies T12-T11≥3s, and the time between each adjacent impact is T12-T1=30s.

[0012] In the aforementioned test control method of the integrated test device for the anti-ignition test of the aircraft oxygen system, when the gas temperature data Tg±1℃, T9-T8≤20ms, T10-T7≥3s, and T11-T1<27s displayed by the temperature measurement and display device are simultaneously satisfied, the impact is recorded as valid; the next impact cycle begins until the remaining number of impacts is 0.

[0013] In the aforementioned test control method of the integrated test device for the anti-ignition test of the aircraft oxygen system, when the gas temperature data of the temperature measurement and display device does not conform to Tg±1℃, the temperature control device is activated to heat until the temperature is within the range of Tg±1℃.

[0014] Beneficial effects: This invention incorporates a safety explosion-proof device and an automated control program, allowing test personnel to remotely monitor the test status and fully ensuring their safety. It also features an anti-ignition integrated processing device, eliminating the need for frequent manual operation of switches and precise control of valve opening and closing times, gas flow rates, etc., significantly reducing the difficulty of manual operation and the requirements for test personnel. Furthermore, the anti-ignition integrated processing device can immediately determine the validity of the test at the end of the test through internal control logic, eliminating the need for post-test analysis of massive amounts of test data (tens of millions of data points) and avoiding the problems of excessively long schedules and test times caused by supplementary tests due to invalid test data. Attached Figure Description

[0015] Figure 1 This is a connection diagram of an aircraft oxygen system anti-ignition test device. Figure 2 This is a schematic diagram of the internal module of the integrated anti-ignition test treatment device 17; Figure 3 This is the self-test logic diagram of the anti-ignition test integrated processing device; Figure 4 This is a logic diagram of the data acquisition, control, and data processing of the integrated processing device for the anti-ignition test. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] Example 1. An aircraft oxygen system anti-ignition test device, see [link to example]. Figures 1-4The test piece 14 is connected to an oxygen source (oxygen 1) via a gas supply valve 2, pipeline A3, high-pressure vessel 5, and pipeline B10. The test piece 14 is also connected to an exhaust valve 12. A temperature control device 4 is installed around the high-pressure vessel 5, and a water bath heating environment is provided between the temperature control device 4 and the high-pressure vessel 5. A safety explosion-proof device 15 is also installed around the test piece 14. A quick-opening valve 9 is installed on pipeline B10. An impact pressure measurement and control device 11 is installed on pipeline B10 between the quick-opening valve 9 and the oxygen supply port 13. The temperature control device 4 is equipped with a temperature measurement and display device 7 for monitoring the temperature of the high-pressure vessel 5 and a gas source pressure measurement and control device 8 for monitoring the pressure of the high-pressure vessel 5. The gas supply valve 2, temperature control device 4, temperature measurement and display device 7, gas source pressure measurement and control device 8, quick-opening valve 9, impact pressure measurement and control device 11, and exhaust valve 12 are all electrically connected to an anti-ignition test integrated processing device 17.

[0018] The aforementioned anti-ignition test integrated treatment device 17 includes: The data acquisition module is used to collect data on temperature, on / off status, flow rate, and pressure. The integrated processing module is used to record the opening and closing times of each valve and the corresponding time of each pressure data from the impact pressure measurement and control device 11. The integrated display module is used to display the gas temperature and pressure data inside the high-pressure vessel 5, the remaining number of impacts and the total number of impacts, and the pressure impact waveform received by the impact pressure measurement and control device 11, providing a user-friendly monitoring screen for monitoring personnel. The control output module is used for the switching and flow control of the gas supply valve 2, quick-opening valve 9, exhaust valve 12, and temperature control device 4.

[0019] The aforementioned pressure data was collected at a frequency of at least one data point per 1ms.

[0020] The aforementioned temperature measuring and display device 7 is equipped with a heat insulation device 6.

[0021] The aforementioned impact pressure measurement and control device 11 and pipeline A3 are respectively equipped with electrostatic protection device A16 and electrostatic protection device B18.

[0022] Both of the aforementioned pipes A3 and B10 are copper pipes.

[0023] The aforementioned safety and explosion-proof device 15 is equipped with a remote monitoring camera.

[0024] The aforementioned test control method for the integrated test apparatus for anti-ignition testing of aircraft oxygen systems involves the following steps: At the start of the test, the integrated anti-ignition testing device 17 opens the quick-opening valve 9, allowing high-speed oxygen to enter the test specimen 14 through the oxygen filling port 13. The impact time lasts 3–5 seconds. The integrated anti-ignition testing device 17 records the opening time T1, closing time T2, and gas mass flow rate L2 through the quick-opening valve 9. After the impact, the integrated anti-ignition testing device 17 opens the supply valve 2 and the exhaust valve 12, recording the opening time T3, closing time T4, and mass flow rate L2 through the supply valve 2, the opening time T5, and closing time T6 of the exhaust valve 12, and the impact pressure on the test specimen 14. The impact pressure is recorded as greater than the preset pressure P. At time T7, record the first peak pressure greater than P, P2; at time T8, record 0.1P2; at time T9, record 0.9P2; and at time T10, record the critical moment when the impact pressure drops to P. Record the moment T11 when the pressure of the pressure impact monitoring device reaches 0, and control 5s ≥ T2 - T1 > 3s, T9 - T8 ≤ 20ms, the pressure holding time in test piece 14 T7 ≥ 3s, and T11 - T1 < 27s. After the pressure impact ends, replenish the high-pressure container 5 with gas and release the pressure in test piece 14. T3 > T2, replenish the gas as slowly as possible, satisfying 27s > T4 - T3 ≥ 3s, and the time when the pressure in the test piece reaches 0 satisfies T12 - T11 ≥ 3s. The time between each adjacent impact is T12 - T1 = 30s.

[0025] When the gas temperature data Tg±1℃, T9-T8≤20ms, T10-T7≥3s, and T11-T1<27s displayed by the temperature measuring and display device 7 are simultaneously satisfied, the impact is recorded as valid; the next impact cycle begins until the remaining number of impacts is 0.

[0026] If the gas temperature data of the aforementioned temperature measurement and display device 7 does not conform to Tg±1℃, the temperature control device 4 is activated to heat until the temperature is within the range of Tg±1℃.

[0027] Example 2. A comprehensive test apparatus for ignition resistance testing of an aircraft oxygen system, see [link to example]. Figures 1-4 It includes the following components: 1. Pressure detection equipment. This includes one pressure monitoring device for detecting the pressure of the gas source, used to continuously detect whether the pressure inside the high-pressure vessel is within the specified range; and one impact pressure measurement and control device, used to continuously monitor the impact pressure borne by the test piece during the ignition resistance test.

[0028] 2. Valve assembly. This includes an air supply valve, a quick-opening valve, and an air exhaust valve. The valves control the air supply and exhaust to the downstream end according to a preset program. After exhausting, air is replenished according to the consumption.

[0029] 3. Anti-ignition integrated processing device: This includes a data acquisition module, an integrated processing module, an integrated display module, and a control output module. The integrated display module displays temperature and pressure data, as well as information such as the effective number of impacts. The data acquisition module collects temperature and pressure signals, which are then processed by the integrated processing module and transmitted to the integrated display device. The integrated display device displays temperature and pressure data in real time. Simultaneously, the integrated processing module, based on preset data processing logic, determines the validity of each impact test, provides information on the remaining number of impact tests, and displays this information on the integrated display module.

[0030] 4. Safety Protection Devices: These include explosion-proof safety devices and electrostatic discharge (ESD) protection devices. Explosion-proof safety devices are used to store test specimens and prevent injury to personnel from combustion or explosion caused by abnormal testing. ESD protection devices are used to divert static electricity generated in the pipeline by high-speed airflow, preventing electrostatic discharge and fire.

[0031] 5. Temperature Control and Display Device. This includes a temperature control device and a temperature measurement and display device. The temperature measurement component is a sensor, such as a platinum resistance thermometer. Its electrical components should be isolated from the high-pressure oxygen supply. It is used to detect the gas temperature inside the high-pressure vessel 5 and transmit the temperature data to the temperature measurement and display device and the anti-ignition integrated processing device. The temperature control device is driven by the control output module of the anti-ignition integrated processing device and is used to heat the oxygen to the specified temperature. The temperature measurement and display device is a digital display instrument, allowing test personnel to directly read the temperature data.

[0032] 6. Connecting devices: These mainly include copper pipes and cables. Copper pipes are used for connecting various devices, and cables are used for transmitting signals.

[0033] Example 3. A comprehensive test apparatus for ignition resistance testing of an aircraft oxygen system, see [link to example]. Figures 1-4 This system is used to conduct ignition pressure shock tests on oxygen pressure regulators and oxygen switches in oxygen systems. It includes the following components: pressure detection equipment, valve assembly, anti-ignition integrated processing device, safety protection device, temperature control and display device, and connecting device. The pressure detection equipment is used to detect the pressure inside the high-pressure vessel and continuously monitor the shock pressure experienced by the test specimen during the anti-ignition test. The valve assembly controls the supply and exhaust of gas to the downstream end according to a preset program, and replenishes gas based on consumption after exhaust. The anti-ignition integrated processing device displays temperature and pressure data, as well as information such as the number of effective shocks. The safety explosion-proof device stores the test specimen and diverts static electricity generated in the pipeline by high-speed airflow. The temperature control and display device detects and controls the oxygen temperature inside the high-pressure vessel. The connecting device is used for connecting the various devices and transmitting signals.

[0034] The aforementioned pressure detection equipment can monitor the pressure inside the high-pressure container 5 in real time, and after data processing, it is displayed as the pressure of oxygen inside the high-pressure container on the anti-ignition test integrated processing device 17.

[0035] The aforementioned pressure detection equipment requires a high acquisition frequency, with at least one data point per 1ms. Through filtering design, interference signals are prevented from entering.

[0036] The aforementioned anti-ignition integrated processing device 17 consists of a data acquisition module, an integrated processing module, an integrated display module, and a control output module. The integrated processing module records the valve opening and closing times, as well as the corresponding times for each pressure data point from the impact pressure measurement and control device. The integrated display module displays the gas temperature and pressure data inside the high-pressure vessel 5, the remaining number of impacts and the total number of impacts, and the pressure impact waveform received by the impact pressure measurement and control device 11, providing a user-friendly monitoring interface for monitoring personnel. The control output module controls the opening and closing of the gas supply valve 2, the quick-opening valve 9, the exhaust valve 12, and the temperature control device 4, as well as the flow control.

[0037] The aforementioned valve assembly includes a gas supply valve 2, a quick-opening valve 9, and an exhaust valve 12. The gas supply valve 2 is a gas source switch with flow monitoring, used to replenish oxygen to the high-pressure vessel and record the cumulative mass flow rate of the replenished gas. Its flow meter can withstand high pressure. The quick-opening valve 9 is a quick-opening switch that ensures the test piece reaches the specified impact pressure within 20ms. The opening and closing of the quick-opening valve 9 is controlled by the anti-ignition test integrated processing device 17, which also records the cumulative volume of gas released. The flow meter built into the quick-opening valve 9 can withstand high pressure and transmits the flow data to the anti-ignition test integrated processing device 17. The exhaust valve 12 is an exhaust switch used to quickly release gas from the test piece and pipeline.

[0038] The aforementioned anti-ignition test integrated processing device 17 is used to collect and record the opening and closing status and data information of the gas supply valve 2, temperature measurement and display device 7, gas source pressure measurement and control device 8, quick-opening valve 9, and exhaust valve 12 during a single impact, and to calculate relevant time information. After the test begins, the anti-ignition test integrated processing device 17 opens the quick-opening valve 9, and high-speed oxygen enters the test piece 14 through the oxygen filling port 13. The impact time lasts for 3-5 seconds. The anti-ignition test integrated processing device 17 records the opening time T1 and closing time T2 of the quick-opening valve 9, as well as the gas mass flow rate L2 passing through the quick-opening valve. After the impact, the anti-ignition test integrated processing device 17 opens the gas supply valve and the exhaust valve, records the opening time T3 and closing time T4 of the gas supply valve 2, the mass flow rate L2 through the gas supply valve 2, the opening time T5 and closing time T6 of the exhaust valve 12, the impact pressure of the test piece, the time when the impact pressure is greater than P (specified pressure) T7, the first peak pressure greater than P P2, the time when 0.1P2 is recorded T8, the time when 0.9P2 is recorded T9, and the critical time when the impact pressure drops to P T10. Record the time T11 when the pressure of the pressure impact monitoring device reaches 0, and control 5s≥T2-T1>3s, T9-T8≤20ms, the pressure holding time inside the test piece T7≥3s, and T11-T1<27s; after the pressure impact, proceed to replenish gas to the high-pressure container and release the pressure inside the test piece, T3>T2, replenish gas as slowly as possible, satisfying 27s>T4-T3≥3s, the time when the pressure inside the test piece reaches 0 satisfies T12-T11≥3s, and the time between each adjacent impact is T12-T1=30s.

[0039] The data processing logic of the aforementioned anti-ignition test integrated processing device 17 is as follows: when the gas temperature data Tg±1℃, T9-T8≤20ms, T10-T7≥3s, and T11-T1<27s of the display device are simultaneously satisfied, the impact is recorded as valid. When the remaining number of impacts is not 0, the next impact cycle is entered until the remaining number of impacts is 0.

[0040] When the gas temperature data monitored by the temperature measurement and display device 7 of the aforementioned anti-ignition test integrated processing device 17 does not conform to Tg±1℃, the temperature control device 4 is activated to heat until the temperature is within the range of Tg±1℃.

[0041] The aforementioned connection device includes connecting pipe A3 and electrostatic protection device A16. The pipe should be made of a material (such as copper) with a maximum non-combustible pressure much greater than the specified impact pressure P. Valves should avoid using non-metallic and rubber materials, and non-metallic materials are prohibited from being used in the pipe.

[0042] The aforementioned temperature measurement and display device 7 is connected to the high-pressure vessel via a pipeline. The temperature detection part is mainly a platinum resistance thermometer, which physically isolates the oxygen and ensures safe oxygen use.

[0043] The aforementioned temperature control device 4 uses a water bath heating method to ensure that the high-pressure container 5 is heated evenly and that oxygen is used safely.

[0044] The aforementioned safety and explosion-proof devices include an explosion-proof enclosure and an electrostatic discharge (ESD) protection device. The explosion-proof enclosure is an explosion-proof box used to physically isolate the test specimen and houses remote monitoring equipment for personnel to monitor the test status remotely. The ESD protection device is used to divert static electricity generated by high-speed airflow in the pipeline, preventing electrostatic discharge and fire.

[0045] Example 4. A comprehensive test apparatus for ignition resistance testing of an aircraft oxygen system, see [link to example]. Figures 1-4The oxygen source (oxygen 1), supply valve 2, high-pressure vessel 5, quick-opening valve 9, test piece 14, and exhaust valve 12 are all connected via copper pipes. High-pressure vessel 5 is connected to the gas source pressure measurement and control device 8 and the temperature measurement and display device 7 via copper pipes. The impact pressure measurement and control device 11 is connected to pipe B10 via pipe 16, and its installation position should be close to the test piece. Supply valve 2, temperature control device 4, temperature measurement and display device 7, gas source pressure measurement and control device 8, quick-opening valve 9, and exhaust valve 12 are connected to the anti-ignition test integrated processing device 17 via cables. The anti-ignition test integrated processing device 17 has functions for acquiring, processing, displaying, and controlling temperature, pressure, and flow data. After processing, the acquired temperature, pressure, and time data are used to provide feedback signals to supply valve 2, temperature control device 4, quick-opening valve 9, and exhaust valve 12, controlling the opening and closing of the valves / temperature control devices. Gas supply valve 2 is a gas source switch with flow monitoring, used to replenish oxygen to the high-pressure vessel and record the cumulative gas mass flow rate. Its flow meter can withstand high pressure. The anti-ignition test integrated processing device 17 controls the gas supply flow rate of gas supply valve 2 based on the flow data sent by quick-opening valve 9. Temperature control device 4 uses a water bath to heat the gas inside high-pressure vessel 5, ensuring uniform heating and safe oxygen use. Temperature measurement and display device 7 detects the gas temperature inside high-pressure vessel 5. To ensure the safety of the anti-ignition test, the temperature measurement part is a sensor, which can be a platinum resistance thermometer, and sends the temperature signal to anti-ignition test integrated processing device 17. When the temperature is below Tg-1℃, anti-ignition test integrated processing device 17 activates temperature control device 4 to heat the high-pressure vessel. High-pressure vessel 5 should have a sufficiently large volume to avoid unstable gas supply pressure during pressure surges; the volume is generally not less than 6L. Thermal insulation device 6 is used for thermal insulation to prevent external temperature from affecting the data of temperature measurement and display device 7. The quick-opening valve 9 is a fast-opening switch that ensures the test specimen reaches the specified impact pressure within 20ms. The opening and closing of the quick-opening valve 9 is controlled by the anti-ignition test integrated processing device 17, which simultaneously records the cumulative released gas volume. The flow meter built into the quick-opening valve 9 can withstand high pressure and sends the flow data to the anti-ignition test integrated processing device 17. The gas source pressure measurement and control device 8 is used to monitor the pressure inside the high-pressure vessel 5. The total length of the pipeline from the quick-opening valve 9 to the front end of the oxygen filling port 13 of the test specimen is 1m, with a moderate inner diameter to prevent significant flow restriction. The impact pressure measurement and control device 11 is used to monitor the impact pressure on the test specimen and sends the pressure data to the anti-ignition test integrated processing device 17. The exhaust valve 12 is an exhaust switch used to quickly release gas from the test specimen and pipeline. The safety explosion-proof device 15 is used to isolate the test specimen and is equipped with a remote monitoring camera, allowing test personnel to monitor the test status remotely and prevent injury to test personnel and damage to test equipment caused by the test specimen being ignited during the test.

[0046] Please see Figure 2The anti-ignition test integrated processing device 17 consists of a data acquisition module, an integrated processing module, an integrated display module, and a control output module. The integrated display module is a human-machine interface used to display the gas temperature and pressure data inside the high-pressure vessel 5, the remaining number of impacts and the total number of impacts, and the pressure impact waveform received by the impact pressure measurement and control device 11, providing a user-friendly monitoring screen for monitoring personnel. The data acquisition module is used to acquire the on / off status and flow information of the gas supply valve 2, quick-opening valve 9, and exhaust valve 12; to acquire the temperature information of the temperature measurement and display device 7; and to acquire the pressure information of the gas source pressure measurement and control device 8 and the impact pressure measurement and control device 11. The control output module is used to control the on / off status of the gas supply valve 2, quick-opening valve 9, and exhaust valve 12; to control the gas supply flow of the gas supply valve 2; and to control the temperature control device 4 to start heating. The integrated processing module processes the data acquired by the acquisition module through preset logic and then sends the processed data to the integrated display module and the control output module. The tester inputs the number of tests on the integrated display module. Simultaneously, after clicking "Start Test" on the integrated display module, the integrated processing module collects the on / off status and flow information of the gas supply valve 2, quick-opening valve 9, and exhaust valve 12 through the data acquisition module. It also collects the temperature information from the temperature measurement and display device 7, and the pressure information from the gas source pressure measurement and control device 8 and the impact pressure measurement and control device 11. This information is processed by the integrated processing module and divided into two paths. One path is transmitted to the integrated display module, which displays the total number of tests, the remaining number of tests, the pressure from the gas source pressure measurement and control device 8, and the temperature information from the temperature measurement and display device 7. The other path is transmitted to the control output module, which controls the on / off status of the gas supply valve 2, quick-opening valve 9, and exhaust valve 13, as well as the gas supply flow rate of the gas supply valve 2, and controls the temperature control device 4 to start heating.

[0047] The anti-ignition integrated signal processing device has the following functions: a) The data acquisition module is used to collect gas temperature data T0 from the high-pressure vessel temperature control and display device. When the temperature is below Tg-1℃, the control output module starts the temperature control device to heat up. When the temperature reaches Tg+1℃, the heating stops. The data acquisition module records the temperature data in real time with a sampling frequency of 10 times / s. Tg is the nominal temperature value specified in the ignition resistance test.

[0048] b) The data acquisition module is used to acquire gas pressure data from the high-pressure vessel gas source pressure measurement and control device, and record the pressure data P0 in real time.

[0049] c) The data acquisition module is used to acquire the opening and closing status of the quick-opening valve 9. Taking a single impact as an example, the integrated processing module records the opening time T1 and closing time T2 of this impact, and records the gas mass flow rate data L1 through the quick-opening valve 9.

[0050] d) The data acquisition module collects the opening and closing status of the gas supply valve 2. Taking a single impact as an example, the integrated processing module records the opening time T3 and closing time T4 of this impact, and records the gas mass flow rate data L2 through the gas supply valve 2. The gas supply valve 2 opens after the quick-opening valve 9 closes, that is, T3 > T2. The mass flow rate through the gas supply valve 2 is the same as the mass flow rate through the quick-opening valve 9, that is, L2 = L1.

[0051] e) The control output module is used to control the opening and closing state of the exhaust valve 12. Taking a single impact as an example, the comprehensive processing module records the opening time T5 and closing time T6 of the exhaust valve 12 during this impact.

[0052] f) The data acquisition module is used to collect data from the pressure impact monitoring device. Taking a single impact as an example, the integrated processing module records the impact pressure of the test piece when the quick-opening valve 2 is in the open state during this impact, records the moment when the impact pressure is greater than P (the specified pressure) at T7, records the first peak pressure greater than P at P2, records the moment when the pressure reaches 0.1P2 at T8, records the moment when the pressure reaches 0.9P2 at T9, and records the critical moment when the impact pressure drops to P at T10. It also records the moment when the pressure of the pressure impact monitoring device reaches 0 at T11. The data acquisition module converts the pressure signal into an electrical signal to achieve the pressure acquisition function. A high acquisition frequency is required, with at least one data point per ms. Through filtering design, interference signals are avoided from entering and affecting the validity of the test data.

[0053] g): c)~f) is one impact cycle process. During the next impact, the integrated processing module records the opening time of the quick-opening valve 2 as T12. The exhaust valve 12 opens when the quick-opening valve 2 closes and closes before the next impact begins, that is, T2<T6<T12.

[0054] h) When T9-T8≤20ms, T10-T7≥3s, and T11-T1<27s, record one successful impact.

[0055] i) When the cumulative number of impacts meets the impact requirement, close the test procedure and terminate the test. All valves and pipelines should use materials with a maximum non-combustible pressure far exceeding the specified impact pressure P (such as copper). Avoid using non-metallic and rubber materials for valves, and prohibit the use of non-metallic materials for pipelines. All valves and pipelines should be clean. Valves and pipelines should be protected by electrostatic discharge protection device 18 to eliminate static electricity generated by high-speed gas flow or power supply equipment, preventing static fires during the test. When conducting the ignition resistance test, the test specimens are stored in an explosion-proof box. Test personnel only need to remotely activate the ignition resistance test integrated processing device 17. Due to the effective isolation of the safety explosion-proof device and the automated control program, test personnel only need to remotely monitor the test status, fully ensuring their safety.

[0056] Please see Figure 3The entire system has a pre-test self-check function. After each device is started, the anti-ignition test integrated processing device 17 reads the temperature data from the temperature measurement and display device 7 through the data acquisition module. The integrated processing module analyzes and processes the data to determine whether the temperature is within the range of Tg±1℃. If not, the anti-ignition test integrated processing device 17 starts the temperature control device 4 for heating through the control output module. Subsequently, the pressure of the gas source pressure measurement and control device 8 is read through the data acquisition module. If the pressure is less than Pg (specified pressure), the anti-ignition test integrated processing device 17 opens the gas supply valve 2 to supply gas to the high-pressure container 5 through the control output module. When the temperature is within Tg±1℃ and the pressure of the gas source pressure measurement and control device 8 is Pg (specified pressure), the anti-ignition test integrated processing device 17 collects the switch status of the quick-opening valve 9 and the exhaust valve 12 through the data acquisition module. At this point, the entire system self-check is complete, and the anti-ignition test can begin. Otherwise, the test device is in an abnormal state, and the test is terminated.

[0057] Please see Figure 1 and Figure 4The anti-ignition test integrated processing device 17 has the functions of data acquisition and control of the status of other equipment. Taking a single impact as an example, the test data processing and control logic is as follows: Set the number of impacts N in the anti-ignition test integrated processing device 17 and click "Start Test". The anti-ignition test integrated processing device 17 reads the temperature information of the temperature measurement and display device 7, the on / off status and flow information of the gas supply valve 2 and the quick-opening valve 9, and the pressure information of the gas source pressure measurement and control device 8 and the impact pressure measurement and control device 11 through the data acquisition module. At the same time, it opens the quick-opening valve 9 through the control output module and records the opening time T1 of the quick-opening valve 9 for this impact. High-pressure oxygen enters the oxygen filling port 13 and the test piece 14 from the high-pressure container 5 through pipeline A3, quick-opening valve 9, and pipeline B10. The impact pressure measurement and control device 11 detects the pressure in pipeline B10, with a sampling frequency of not less than 1 time / ms, and sends the impact pressure P data to the anti-ignition test integrated processing device 17. The data acquisition module of the anti-ignition test integrated processing device 17 collects and records the impact pressure in real time, and records the time T7 when the pressure is greater than P (specified pressure), the first peak pressure P2 greater than P in this impact, the time T8 when the pressure is 0.1P2, and the time T9 when the pressure is 0.9P2. After the quick-opening valve 9 is opened for 3-5 seconds, the anti-ignition test integrated processing device 17 closes the quick-opening valve 9 through the control output module, records the mass flow rate L1 through the quick-opening valve 9 during this impact, records the time T2 when the quick-opening valve 9 is closed, and the impact pressure measurement and control device 11 sends the critical time T10 when the impact pressure drops to P to the anti-ignition test integrated processing device 17. After the quick-opening valve 9 closes, the integrated processing module of the anti-ignition test integrated processing device 17 outputs two control signals. One signal opens the gas supply valve 2 to supply gas slowly, with the supply time controlled between 3 and 27 seconds. When the mass flow rate through the gas supply valve 2 L2 = L1, the gas supply valve 2 is closed. The other signal opens the exhaust valve 12, recording the opening time T5 and closing time T6 of the exhaust valve 12, and recording the time T11 when the pressure drop of the pressure impact monitoring device reaches 0. T11 - T1 should be less than 27 seconds. After the above signals are collected, the integrated processing module judges the validity of this impact: if the temperature measurement and display device 7 shows a temperature exceeding Tg ± 1℃, the impact data is invalid. Then, the temperature control device 4 is activated to heat up, and the next impact test is initiated. The start time of the next impact should be 30 seconds apart from T1. The closing time T6 of the exhaust valve 12 in this impact should be earlier than the opening time of the quick-opening valve 9 in the next impact.If the temperature displayed by the temperature measurement and display device 7 conforms to Tg±1℃, the integrated processing module of the anti-ignition test integrated processing device 17 further judges the validity of the data. That is, when T9-T8≤20ms, T10-T7≥3s, and T11-T1<27s are simultaneously satisfied, the impact data is valid, the remaining number of anti-ignition impact tests is reduced by 1, and the integrated processing module sends the remaining number of anti-ignition impact tests to the integrated display module for display. When T9-T8≤20ms, T10-T7≥3s, and T11-T1<27s cannot be simultaneously satisfied, the impact data is invalid, and the next impact test is started. It should be ensured that the start time of the next impact is 30s apart from T1. The aforementioned automated control and implementation logic avoids the problems of frequent manual operation of switches and difficulty in accurately controlling the opening and closing times of each valve and the gas supply flow, greatly reducing the difficulty of manual operation, the workload of test personnel, and the skill requirements of the test personnel. The anti-ignition integrated processing device, through its internal judgment logic, immediately provides a validity judgment of the test results at the end of each test and calculates the remaining number of tests, avoiding the need for post-test analysis of massive amounts of test data (tens of millions of data points), and also avoiding the problems of excessive progress and test time caused by supplementary tests due to invalid test data. When the remaining number of impacts displayed on the anti-ignition test integrated processing device 17 is not 0, the above impact cycle is repeated until the remaining number of impacts displayed on the anti-ignition test integrated processing device 17 is 0, at which point the test is complete.

[0058] The above-described embodiments are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A comprehensive test apparatus for ignition resistance testing of an aircraft oxygen system, characterized in that, The test setup includes an oxygen source, which is connected sequentially to the oxygen supply valve, pipeline A, high-pressure vessel, and pipeline B to the oxygen filling port of the test piece. The test piece is also connected to an exhaust valve. A temperature control device is installed around the high-pressure vessel, with a water bath heating environment between the temperature control device and the high-pressure vessel's interlayer. An explosion-proof safety device is also installed around the test piece. A quick-opening valve is installed on pipeline B. An impact pressure measurement and control device is installed on pipeline B between the quick-opening valve and the oxygen filling port. The temperature control device includes a temperature measurement and display device for monitoring the high-pressure vessel's temperature and a gas source pressure measurement and control device for monitoring the high-pressure vessel's pressure. The oxygen supply valve, temperature control device, temperature measurement and display device, gas source pressure measurement and control device, quick-opening valve, impact pressure measurement and control device, and exhaust valve are all electrically connected to the anti-ignition test integrated processing device. The integrated ignition resistance test treatment device includes: The data acquisition module is used to collect data on temperature, on / off status, flow rate, and pressure. The integrated processing module is used to record the opening and closing times of each valve and the corresponding time of each pressure data from the impact pressure measurement and control device; The integrated display module is used to display the gas temperature and pressure data inside the high-pressure vessel, the remaining number of impacts and the total number of impacts, and the pressure impact waveform received by the impact pressure measurement and control device, providing a user-friendly monitoring screen for monitoring personnel. The control output module is used for the switching and flow control of gas supply valves, quick-opening valves and exhaust valves, and temperature control devices.

2. The comprehensive test apparatus for ignition resistance testing of aircraft oxygen systems according to claim 1, characterized in that, The pressure data acquisition frequency is no less than one data point per 1ms.

3. The comprehensive test apparatus for ignition resistance testing of aircraft oxygen systems according to claim 1, characterized in that, A heat insulation device is installed at the temperature measurement and display device.

4. The comprehensive test apparatus for ignition resistance testing of aircraft oxygen systems according to claim 1, characterized in that, The impact pressure measurement and control device and pipeline A are respectively equipped with electrostatic protection device A and electrostatic protection device B.

5. The integrated test apparatus for ignition resistance testing of aircraft oxygen systems according to claim 1, characterized in that, Both pipe A and pipe B are copper pipes.

6. The integrated test apparatus for ignition resistance testing of aircraft oxygen systems according to claim 1, characterized in that, The safety and explosion-proof device is equipped with remote monitoring cameras.

7. A test control method for a comprehensive test apparatus for ignition resistance testing of an aircraft oxygen system as described in any one of claims 1-6, characterized in that, At the start of the test, the anti-ignition test integrated processing device opens the quick-opening valve, allowing high-speed oxygen to enter the test specimen through its oxygen filling port. The impact time lasts 3–5 seconds. The anti-ignition test integrated processing device records the opening time T1, closing time T2, and gas mass flow rate L2 through the quick-opening valve. After the impact, the anti-ignition test integrated processing device opens the gas supply valve and exhaust valve, recording the opening time T3, closing time T4, and gas mass flow rate L2 through the gas supply valve, the opening time T5, and closing time T6 of the exhaust valve, the impact pressure of the test specimen, the time when the impact pressure exceeds the preset pressure P, the first peak pressure P2 exceeding P, the time T8 when 0.1P2 is recorded, and the time T9 when 0.1P2 is recorded. At time T9 of .9P2, record the critical moment T10 when the impact pressure drops to P; record the moment T11 when the pressure of the pressure impact monitoring device reaches 0, and control 5s≥T2-T1>3s, T9-T8≤20ms, the pressure holding time inside the test piece T7≥3s, T11-T1<27s; after the pressure impact ends, enter the process of replenishing air to the high-pressure container and releasing the pressure inside the test piece, T3>T2, replenishing air as slowly as possible, satisfying 27s>T4-T3≥3s, the time when the pressure inside the test piece reaches 0 satisfies T12-T11≥3s, the time of each adjacent impact T12-T1=30s, and T12 is the opening time of the quick-opening valve recorded by the integrated processing module during the next impact.

8. The test control method of the integrated test apparatus for ignition resistance testing of aircraft oxygen systems according to claim 7, characterized in that, When the gas temperature data Tg±1℃, T9-T8≤20ms, T10-T7≥3s, and T11-T1<27s displayed by the temperature measurement and display device are simultaneously satisfied, the impact is recorded as valid; the next impact cycle begins until the remaining number of impacts is 0; Tg is the nominal temperature value specified in the ignition resistance test.

9. The test control method of the integrated test apparatus for ignition resistance testing of aircraft oxygen systems according to claim 7, characterized in that, If the gas temperature data from the temperature measurement and display device does not conform to Tg±1℃, the temperature control device will be activated to heat the gas until the temperature is within the range of Tg±1℃; Tg is the nominal temperature value specified in the ignition resistance test.

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