Integrated control device for anti-ignition test of oxygen pressure reducer

Abstract

The utility model belongs to high pressure gas safety test technical field, concretely relates to integrated control device of oxygen pressure reducer anti -ignition test. Include: first pneumatic valve, preheating device, seamless steel gas cylinder, temperature sensor, temperature controller, digital pressure gauge, second pneumatic valve, pressure transmitter, pressure gauge, oxygen filling mouth, joint, EX electric valve, computer, wherein, seamless steel gas cylinder sets up in preheating device, and temperature controller is placed in preheating device;First pneumatic valve one end is air inlet end, and the other end of first pneumatic valve is communicated with seamless steel gas cylinder input end;Seamless steel gas cylinder output end is connected with one end of second pneumatic valve, and the other end of second pneumatic valve is connected with the oxygen filling mouth of test piece;The joint of test piece is connected with EX electric valve;First pneumatic valve, second pneumatic valve, digital pressure gauge, pressure transmitter, EX electric valve, temperature sensor, temperature controller are connected with computer.

Description

Technical Field

[0001] This utility model belongs to the field of high-pressure gas safety testing technology, specifically relating to an integrated control device for an oxygen pressure regulator anti-ignition test. Background Technology

[0002] As an aircraft oxygen source control device, the oxygen pressure regulator comes into direct contact with high-pressure oxygen. Given the unique environment of aviation and the inherent dangers of oxygen, the oxygen pressure regulator must eliminate the risks of deflagration and fire caused by factors such as mechanical friction (high-speed impact of metal particles causing micro-sparks), adiabatic compression (rapid local temperature spikes due to instantaneous gas compression), ignition of contaminants (compression ignition of residual grease or rubber debris), and electrostatic discharge (static sparks generated by dry, high-speed gas flowing through the chamber). Therefore, it is necessary to simulate real-world operating conditions and conduct an ignition resistance test on the oxygen pressure regulator. This involves charging the oxygen pressure regulator with high-pressure oxygen for an extremely short time (15–20 ms) and repeating this process 40 times to simulate the extreme number of oxygen charge-discharge cycles the oxygen pressure regulator may experience during the aircraft's service life. Furthermore, the ignition resistance test is a mandatory verification item in airworthiness regulations and must be verified.

[0003] The existing oxygen pressure regulator anti-ignition test has the following drawbacks:

[0004] 1. The high-pressure oxygen circulation test (0→2176.8psig) requires manual operation of the valves, which poses a risk of combustion and explosion;

[0005] 2. ISO 10297-2014 requires precise control of pressurization time (15-20ms) and peak pressure (≤2394.48psig), which is difficult to achieve with traditional equipment;

[0006] 3. The experiment requires 40 cycles (2 rounds × 20 times), and manual operation is inefficient and inconsistent;

[0007] 4. Traditional experiments are relatively dangerous. Utility Model Content

[0008] Purpose of the utility model: To provide an integrated control device for the anti-ignition test of an oxygen pressure regulator, achieving precise pressure waveform control, remote operation, and multiple safety protections.

[0009] Technical solution:

[0010] An integrated control device for an oxygen pressure regulator anti-ignition test includes: a first pneumatic valve 1, a preheating device 2, a seamless steel gas cylinder 3, a temperature sensor, a temperature controller 5, a digital pressure gauge 6, a second pneumatic valve 7, a pressure transmitter 8, a pressure gauge 9, an oxygen filling port 10, a connector 16, an EX electric valve 17, and a computer 19, wherein...

[0011] A seamless steel gas cylinder 3 is placed inside a preheating device 2, and a temperature controller 5 is placed inside the preheating device 2. One end of the first pneumatic valve 1 is the air inlet, and the other end of the first pneumatic valve 1 is connected to the input end of the seamless steel gas cylinder 3. The output end of the seamless steel gas cylinder 3 is connected to one end of a second pneumatic valve 7 through a first pipeline, and the other end of the second pneumatic valve 7 is connected to the oxygen filling port 10 of the test piece 12 through a second pipeline. The connector 16 of the test piece 12 is connected to an EX electric valve 17. The control ends of the first pneumatic valve 1, the second pneumatic valve 7, the output end of the digital pressure gauge 6, the control end of the pressure transmitter 8, the control end of the EX electric valve 17, the output end of the temperature sensor, the temperature controller 5, and the computer 19 are connected.

[0012] Furthermore, the temperature sensor is an industrial platinum resistance thermometer.

[0013] Furthermore, the test specimen 12 was placed inside the explosion-proof chamber 18.

[0014] Furthermore, water is provided in the preheating device 2 to heat the seamless steel gas cylinder 3 by means of water bath heating.

[0015] Furthermore, the piping is made of copper.

[0016] Furthermore, the test specimen 12 is equipped with a low-pressure safety valve 11 and a high-pressure safety valve 15 to ensure the safety of the test specimen.

[0017] Furthermore, high-pressure oxygen enters the seamless steel cylinder 3 through the first pneumatic valve 1. At this time, the second pneumatic valve 7 is closed. The temperature controller 5 is placed in the preheating device 2, and the high-pressure oxygen in the seamless steel cylinder 3 is heated by water bath heating, which is monitored by the industrial platinum resistance thermometer 4. The digital pressure gauge 6 monitors the pressure inside the seamless steel cylinder 3. If the pressure is insufficient, the computer 19 controls the first pneumatic valve 1 to open to supplement the pressure. After the pressure and temperature stabilize, the first pneumatic valve 1 closes, and the computer 19 controls the second pneumatic valve 7 to open, allowing oxygen to enter the seamless steel cylinder 3. Oxygen is rapidly introduced into the oxygen inlet 10 of the test sample 12. The pressure transmitter 8 monitors whether the pressure rise time meets the requirements. The pressure gauge 9 displays the internal pressure of the test sample. The low-pressure safety valve 11 and the high-pressure safety valve 15 ensure the safety of the test sample. The pressure sensing port 14 and the oxygen supply port 13 are open. After the pressure is maintained for 5 seconds, the second pneumatic valve 7 closes and the EX electric valve 17 opens to slowly release the internal pressure of the test sample. After the pressure is released, the EX electric valve 17 closes and the first pneumatic valve 1 reopens to replenish the internal pressure of the seamless steel gas cylinder 3. One cycle is completed.

[0018] Furthermore, the pressure rise time is required to be 15ms to 20ms.

[0019] Beneficial effects:

[0020] 1. Dual-valve coordinated control technology

[0021] The second pneumatic valve 7 enables millisecond-level rapid pressure increase;

[0022] EX electric valve 17 ensures safe release of high-temperature oxygen.

[0023] 2. Dynamic temperature and pressure compensation mechanism

[0024] The first pneumatic valve 1 automatically replenishes pressure (air source pressure ≥ 2176.8 psig);

[0025] Temperature controller 5 controls the gas source temperature to remain stable.

[0026] 3. Precise process control

[0027] Computer analysis of time-pressure curves enables precise control of pressure impact waveforms.

[0028] 4. Experimental efficiency increased by 300%: 40 cycles completed automatically (previously requiring 8 hours of manual operation).

[0029] Safety: Zero contact between personnel and high-pressure oxygen; equipped with an explosion-proof enclosure.

[0030] Accuracy: Boost time control error ≤ 1ms;

[0031] It meets the dual standard verification requirements of ISO 10524-1 / 10297. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of an integrated control device for an oxygen pressure regulator anti-ignition test.

[0033] The components include: 1. First pneumatic valve; 2. Preheating device; 3. Seamless steel gas cylinder; 4. Industrial platinum resistance thermometer; 5. Temperature controller; 6. Digital pressure gauge; 7. Second pneumatic valve; 8. Pressure transmitter; 9. Pressure gauge; 10. Oxygen filling port; 11. Low-pressure safety valve; 12. Test specimen; 13. Oxygen supply port; 14. Pressure sensing port; 15. High-pressure safety valve; 16. Connector; 17. EX electric valve; 18. Explosion-proof chamber; 19. Computer.

[0034] Figure 2 This is the test impact waveform of the device, where t is time (in seconds) and p is pressure (in psig).

[0035] 1- Pressure rise time measurement for each test cycle; 2- First pressure peak measured at the beginning of each cycle; 3- 90% of the first pressure peak; 4- 10% of the first pressure peak; 5- First test cycle; 6- Second test cycle. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0037] In the description of this utility model, it should be understood that the terms "center", "axial", "vertical", "upper", "lower", "upper end", "bottom end", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0038] like Figure 1-2 An integrated control device for an oxygen pressure regulator anti-ignition test includes: a first pneumatic valve 1, a preheating device 2, a seamless steel gas cylinder 3, a temperature sensor, a temperature controller 5, a digital pressure gauge 6, a second pneumatic valve 7, a pressure transmitter 8, a pressure gauge 9, an oxygen filling port 10, a connector 16, an EX electric valve 17, and a computer 19. The seamless steel gas cylinder 3 is housed within the preheating device 2, and the temperature controller 5 is also located within the preheating device 2. One end of the first pneumatic valve 1 is the air inlet, and the other end is connected to the steel cylinder. The input end of the seamless steel gas cylinder 3 is connected; the output end of the seamless steel gas cylinder 3 is connected to one end of the second pneumatic valve 7 through the first pipeline, and the other end of the second pneumatic valve 7 is connected to the oxygen filling port 10 of the test piece 12 through the second pipeline; the connector 16 of the test piece 12 is connected to the EX electric valve 17; the control end of the first pneumatic valve 1, the control end of the second pneumatic valve 7, the output end of the digital pressure gauge 6, the control end of the pressure transmitter 8, the control end of the EX electric valve 17, the output end of the temperature sensor, the temperature controller 5, and the computer 19 are connected.

[0039] In one possible embodiment, the temperature sensor is an industrial platinum resistance thermometer.

[0040] In one possible embodiment, the test specimen 12 is placed inside the blast-resistant chamber 18.

[0041] In one possible embodiment, the preheating device 2 is equipped with water, and the seamless steel gas cylinder 3 is heated by water bath heating.

[0042] In one possible embodiment, the conduit is a copper pipe.

[0043] In one possible embodiment, the test specimen 12 is provided with a low-pressure safety valve 11 and a high-pressure safety valve 15 to ensure the safety of the test specimen.

[0044] Working principle: High-pressure oxygen enters the seamless steel cylinder 3 through the first pneumatic valve 1. At this time, the second pneumatic valve 7 is closed. The temperature controller 5 is placed in the preheating device 2, and the high-pressure oxygen in the seamless steel cylinder 3 is heated by water bath heating, which is monitored by the industrial platinum resistance thermometer 4. The digital pressure gauge 6 monitors the pressure in the seamless steel cylinder 3. If the pressure is insufficient, the computer 19 controls the first pneumatic valve 1 to open to supplement the pressure. After the pressure and temperature stabilize, the first pneumatic valve 1 closes, and the computer 19 controls the second pneumatic valve 7 to open, allowing oxygen to flow into the cylinder. Oxygen is rapidly introduced into the oxygen inlet 10 of the test sample 12. The pressure transmitter 8 monitors whether the pressure rise time meets the requirements. The pressure gauge 9 displays the internal pressure of the test sample. The low-pressure safety valve 11 and the high-pressure safety valve 15 ensure the safety of the test sample. The pressure sensing port 14 and the oxygen supply port 13 are open. After the pressure is maintained for 5 seconds, the second pneumatic valve 7 closes and the EX electric valve 17 opens to slowly release the internal pressure of the test sample. After the pressure is released, the EX electric valve 17 closes and the first pneumatic valve 1 reopens to replenish the internal pressure of the seamless steel gas cylinder 3. One cycle is completed.

[0045] In one possible embodiment, the pressure rise time is required to be 15ms to 20ms.

[0046] Gas source control:

[0047] The temperature and pressure values ​​inside the seamless steel gas cylinder 3 are monitored and fed back by an industrial platinum resistance thermometer 4 and a digital pressure gauge 6; the computer controls the first pneumatic valve 1 and the temperature controller 5 to ensure that the temperature and pressure meet the standards and are stable, and the seamless steel gas cylinder 3 ensures that there is enough oxygen to impact the test sample instantaneously.

[0048] Gas impact and waveform monitoring:

[0049] Pressure transmitter 8 (0.5%FS accuracy, 1000Hz sampling rate) is placed near the inlet of the test specimen to detect pressure fluctuations impacting the specimen. Computer 19 processes the pressure data and confirms whether the maximum pressure, impact time, and pressure holding time of this impact meet the requirements. The data acquisition board converts the current signal in real time: P=(I×1000-4)×20 / 16 (P:MPa, I:mA). The second pneumatic valve 7 and the EX electric valve 17 are connected to the inlet and outlet of the test specimen, respectively, to realize automatic oxygen filling and discharging.

[0050] Safety precautions:

[0051] The test sample was placed in the internal explosion-proof chamber, and the oxygen impact pipeline was grounded to eliminate the influence of the equipment itself.

[0052] Boost time: 15ms≤T≤20ms (10%→90% peak value);

[0053] Pressure holding time: 5s ± 0.1s;

[0054] Depressurize to 0 psig in ≤20 seconds;

[0055] The entire heating, gas replenishment, and gas filling / de-gas process is controlled by a program, and the number of cycles can be freely set.

[0056] Key improvements to the testing process:

[0057] 1. Pre-inspection stage

[0058] A blind plug was used to replace the test specimen, and a sealing test was conducted at 2176.8 psig using nitrogen. After analyzing the time-pressure curve by computer, the pressure inside the seamless steel cylinder was increased or decreased to calibrate the pressure impact waveform (verified in 3 cycles; the impact waveform is shown in the appendix). Figure 2 Find the appropriate pressure impact point.

[0059] 2. Formal Trial

[0060] Preheated oxygen at 60℃ (±3℃ constant temperature water bath, corresponding to airworthiness clause 550) +5 (Highest cargo hold ambient temperature)

[0061] Automatically execute 40 pressure cycles:

[0062] A [Opens the second pneumatic valve] --> B [Pressure increases to 2176.8 psig in 15-20ms]

[0063] B --> C [Hold pressure for 5 seconds]

[0064] C --> D [Open EX valve to release pressure]

[0065] D --> E [Reset to zero within 20 seconds]

[0066] 3. Security Control

[0067] Remote computer start / stop;

[0068] Real-time monitoring of peak pressure (automatic emergency stop when exceeding 2394.48 psig).

[0069] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An integrated control device for an oxygen pressure regulator anti-ignition test, characterized in that, include: The system includes a first pneumatic valve, a preheating device, a seamless steel gas cylinder, a temperature sensor, a temperature controller, and a digital pressure gauge; a second pneumatic valve, a pressure transmitter, a pressure gauge, an oxygen filling port, a connector, an EX electric valve, and a computer. A seamless steel gas cylinder is placed inside a preheating device, and a temperature controller is also placed inside the preheating device. One end of the first pneumatic valve is the air inlet, and the other end of the first pneumatic valve is connected to the input end of the seamless steel gas cylinder. The output end of the seamless steel gas cylinder is connected to one end of a second pneumatic valve via a first pipeline, and the other end of the second pneumatic valve is connected to the oxygen filling port of the test specimen via a second pipeline. The joint of the test specimen is connected to an EX electric valve. The control ends of the first and second pneumatic valves, the output end of the digital pressure gauge, the control end of the pressure transmitter, the control end of the EX electric valve, the output end of the temperature sensor, and the temperature controller are all connected to a computer.

2. The integrated control device according to claim 1, characterized in that, The temperature sensor is an industrial platinum resistance thermometer.

3. The integrated control device according to claim 2, characterized in that, The test specimen was placed inside the explosion-proof chamber.

4. The integrated control device according to claim 3, characterized in that, The preheating device contains water, which heats the seamless steel gas cylinder through a water bath.

5. The integrated control device according to claim 4, characterized in that, The piping is made of copper.

6. The integrated control device according to claim 5, characterized in that, The test specimen (12) is equipped with a low-pressure safety valve and a high-pressure safety valve to ensure the safety of the test specimen.

7. The integrated control device according to claim 6, characterized in that, High-pressure oxygen enters the seamless steel cylinder through the first pneumatic valve. At this time, the second pneumatic valve is closed. The temperature controller is placed in the preheating device, and the high-pressure oxygen in the seamless steel cylinder is heated by water bath heating, which is monitored by an industrial platinum resistance thermometer. The pressure inside the seamless steel cylinder is monitored by a digital pressure gauge. If the pressure is insufficient, the first pneumatic valve is opened by computer control to supplement the pressure. After the pressure and temperature stabilize, the first pneumatic valve is closed, and the second pneumatic valve is opened by computer control to quickly inject oxygen into the oxygen filling port of the test sample. The pressure transmitter monitors whether the pressure rise time meets the requirements, and the pressure gauge displays the pressure inside the test sample. The low-pressure safety valve and the high-pressure safety valve ensure the safety of the test sample. The pressure sensing port and the oxygen supply port are open. After the pressure is maintained for 5 seconds, the second pneumatic valve is closed, and the EX electric valve is opened to slowly release the pressure inside the test sample. After the pressure is released, the EX electric valve is closed, and the first pneumatic valve reopens to supplement the pressure inside the seamless steel cylinder. One cycle is completed.

8. The integrated control device according to claim 1, characterized in that, The required pressure rise time is 15ms to 20ms.

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