Hydrogen-related high-altitude environmental chamber system and test method thereof

Abstract

The invention relates to the technical field of hydrogen-related testing, and discloses a hydrogen-related high-altitude environmental chamber system and a testing method thereof. An air conditioning system; the fresh air system provides fresh air with different humidity for the interior of the environment chamber body; the exhaust suction system simulates high-altitude low air pressure in the cabin body of the environmental cabin; the safety system is used for monitoring the oxygen concentration of the environmental chamber body and monitoring the hydrogen concentration of the environmental chamber body at multiple points; and the control system is used for connecting and controlling the air conditioning system, the fresh air system and the exhaust suction system to simulate the high-altitude temperature, humidity and low-pressure pressure, and is also used for receiving the oxygen concentration and the hydrogen concentration in real time and giving an alarm when any gas concentration is abnormal. According to the hydrogen-related high-altitude environmental chamber system and the testing method thereof, the temperature, humidity and low air pressure of high altitude can be simulated, the concentration of hydrogen and oxygen can be monitored in real time, multi-point accurate monitoring is performed on hydrogen, and automatic and timely treatment is performed when the concentration of hydrogen and oxygen is abnormal.

Description

Technical Field

[0001] This invention relates to the field of hydrogen-related testing technology, specifically to a hydrogen-related high-altitude environmental chamber system and its testing method. Background Technology

[0002] Currently, high-altitude environmental chambers are mainly used for testing in fields such as aerospace and internal combustion engines. These high-altitude environmental chambers typically have good pressure resistance and vacuum pumping capabilities to achieve the required low-pressure environment, and are equipped with temperature control systems to simulate low / high temperatures. However, there are no commercially available technical solutions for testing hydrogen fuel cells in high-altitude environmental chambers.

[0003] When high-altitude environmental chambers, used in aerospace and internal combustion engines, are applied to hydrogen fuel cell testing with hydrogen supply systems, their safety design has significant shortcomings, mainly in the following core aspects: High-altitude environment simulation requires maintaining a set low internal pressure, thus necessitating a higher level of airtightness in the chamber. However, this high level of airtightness increases the gas diffusion resistance within the chamber. If hydrogen leaks from the tested hydrogen fuel cell system or its auxiliary systems (such as pipe interfaces, valves, pressure regulators, etc.), the leaked hydrogen is difficult to diffuse and dilute in a closed and low-pressure environment. It can easily accumulate rapidly in a localized or complete chamber space, reaching the hydrogen explosion limit concentration (4%~75%), posing a significant explosion risk. Therefore, high-altitude environment chambers used for testing hydrogen fuel cells with hydrogen supply systems have higher airtightness requirements but also a higher risk of explosion, necessitating precise monitoring and timely handling of anomalies.

[0004] Existing high-altitude environmental chambers are only equipped with simple single-point gas concentration monitoring devices, resulting in a limited number of monitoring points and a single alarm threshold. When an alarm is triggered, the response is slow; for example, it may only trigger an alarm sound or simply shut down the equipment, failing to quickly and effectively dilute and expel accumulated combustible gases. Furthermore, when hydrogen fuel cells operate in low-pressure environments, if the air supply system (such as the air compressor) fails to adjust in time or malfunctions, it can lead to insufficient oxygen flow into the fuel cell (i.e., even lower oxygen concentration relative to the inherent oxygen deficiency at high altitudes), causing localized hypoxia or even "oxygen starvation." This results in abnormal test data, abnormal performance of the hydrogen fuel cell, and abnormal lifespan. Existing high-altitude environmental chambers do not detect oxygen concentration, let alone handle abnormal concentration conditions. Summary of the Invention

[0005] This application provides a hydrogen-related high-altitude environmental chamber system and its testing method, which can simulate the temperature, humidity and low air pressure at high altitudes, and monitor the concentration of hydrogen and oxygen in real time. The system performs multi-point precise monitoring of hydrogen and automatically and promptly handles abnormal hydrogen and oxygen concentrations.

[0006] In a first aspect, embodiments of this application provide a hydrogen-related high-altitude environmental cabin system, comprising: The environmental chamber is used to house the test sample of the hydrogen fuel cell; The air conditioning system is used to circulate the gas inside the environmental chamber and regulate the internal temperature of the environmental chamber. The fresh air system is used to provide fresh air with different humidity levels inside the environmental chamber; The exhaust suction system is used to simulate the low air pressure at high altitudes inside the environmental chamber. The safety system is used to monitor the oxygen concentration in the environmental chamber and to monitor the hydrogen concentration in the environmental chamber at multiple points. The control system is used to connect and control the air conditioning system, fresh air system and exhaust system to simulate the temperature, humidity and low air pressure at high altitudes. It is also used to receive oxygen and hydrogen concentrations in real time and issue an alarm when any gas concentration is abnormal.

[0007] In conjunction with the first aspect, in one embodiment, the safety system includes multiple hydrogen concentration detection devices distributed at different locations within the environmental chamber, the hydrogen concentration detection devices being connected to the control system; the safety system includes a forced exhaust fan and a corresponding sealing damper, the forced exhaust fan being installed within the environmental chamber, and the sealing damper being sealed to the forced exhaust fan. When any one of the multiple hydrogen concentration detection devices detects a hydrogen concentration greater than a set safety threshold, the control system automatically opens the sealing damper via the hydraulic system and automatically starts the forced exhaust fan to reduce the hydrogen concentration.

[0008] In conjunction with the first aspect, in one embodiment, the safety system includes an oxygen concentration detection device, and when the oxygen concentration detected by the oxygen concentration detection device is lower than the oxygen concentration in the hypoxic environment at high altitudes, the control system controls the air conditioning system, the fresh air system, and the exhaust suction system to stop operating.

[0009] In conjunction with the first aspect, in one embodiment, the air conditioning system includes a temperature sensor disposed within the environmental chamber; the fresh air system includes a humidity sensor disposed within the environmental chamber; the exhaust suction system includes a pressure sensor disposed within the environmental chamber; and the control system receives data from the temperature sensor, humidity sensor, and pressure sensor in real time, and adjusts the air conditioning system, fresh air system, and exhaust suction system to simulate the temperature, humidity, and low air pressure at high altitudes.

[0010] In conjunction with the first aspect, in one embodiment, the air conditioning system comprises an explosion-proof fan, an electric steam boiler, a refrigeration unit, and a heat exchanger; the explosion-proof fan is used to circulate the gas inside the environmental chamber; the electric steam boiler uses heated steam as a heat transfer medium; the refrigeration unit uses 50% pentafluoroethane and 50% trifluoroethane as refrigerants; and the heat exchanger is used to exchange heat between the gas inside the environmental chamber and the refrigerants and heat transfer medium.

[0011] In conjunction with the first aspect, in one embodiment, the environmental chamber is in the shape of a cuboid shell, and the safety system includes five hydrogen concentration detection devices and one oxygen concentration detection device; the five hydrogen concentration detection devices are respectively located at the four corners and the center point of the top of the cuboid shell; the one oxygen concentration detection device is located next to the center point of the top of the cuboid shell.

[0012] In conjunction with the first aspect, in one embodiment, the environmental chamber is equipped with a steel sealing door, which is opened or closed by air circulation control; the steel sealing door is circumferentially sealed with a positive pressure airbag; a pressure relief valve is installed on the top of the environmental chamber, which is connected to the positive pressure airbag; when the steel sealing door cannot be opened, the pressure relief valve opens and the positive pressure airbag deflates.

[0013] In conjunction with the first aspect, in one embodiment, the exhaust suction system includes a high-pressure blower that draws air from the environmental chamber through a pipe and creates the required low air pressure. The high-pressure blower is also used to exhaust waste gas from inside the environmental chamber.

[0014] In conjunction with the first aspect, in one embodiment, the altitude environment chamber system further includes an insulation layer made of polyurethane elastomer; the insulation layer is partially attached to the inner surface of the environment chamber body, and the insulation layer itself forms a closed cavity to accommodate the sample under test; the insulation layer includes a double-hinged door, the double-hinged door is located inside the steel sealed door, and the double-hinged door has an anti-condensation electrically heated observation window.

[0015] Secondly, this application provides a testing method based on the above-mentioned hydrogen-related high-altitude environmental chamber system, comprising the following steps: The hydrogen fuel cell test sample is placed inside the environmental chamber, and the control system simulates a high-altitude temperature, humidity and low air pressure through the air conditioning system, fresh air system and exhaust suction system. The hydrogen fuel cell test begins. The safety system acquires one oxygen concentration data and multiple hydrogen concentration data in real time. When any hydrogen concentration data exceeds the set safety threshold, the control system issues an alarm and discharges the gas inside the environmental chamber. When the oxygen concentration is lower than the oxygen concentration in the hypoxic environment at high altitudes, the control system controls the air conditioning system, fresh air system, and exhaust system to stop operating.

[0016] The beneficial effects of the technical solutions provided in this application include at least the following: 1. The proposed hydrogen-based high-altitude environmental chamber system simulates the temperature, humidity, and low atmospheric pressure of high altitudes through an air conditioning system, a fresh air system, and an exhaust / suction system. A safety system monitors the oxygen and hydrogen concentrations within the chamber, with multi-point precise monitoring of hydrogen concentration. An alarm is triggered and automatically handled when any gas concentration is abnormal. Compared to traditional high-altitude environmental chambers with single-point gas concentration monitoring, this hydrogen-based high-altitude environmental chamber system's safety system monitors hydrogen concentration at multiple points within the chamber, enabling timely and automatic handling even under low-pressure conditions with uneven hydrogen distribution. Simultaneously, this hydrogen-based high-altitude environmental chamber system monitors oxygen concentration. Unlike traditional high-altitude environmental chambers that lack oxygen concentration monitoring, this system also automatically and promptly handles abnormal oxygen concentrations (i.e., oxygen concentrations within the chamber are lower than the oxygen concentrations typically found at high altitudes), ensuring the test's authenticity, reliability, and safety. This hydrogen-based high-altitude environmental chamber system enables hydrogen fuel cells to safely and reliably complete testing tasks in the simulated environment with controllable risks.

[0017] 2. The hydrogen-related high-altitude environmental chamber system of this application has multiple hydrogen concentration detection devices distributed in different positions within the environmental chamber. These multiple hydrogen concentration detection devices can accurately measure the uneven distribution of hydrogen under low-pressure conditions. When the hydrogen concentration detected by any hydrogen concentration detection device exceeds the set safety threshold, the control system automatically opens the sealed air door through the hydraulic system and automatically starts the forced exhaust fan to reduce the hydrogen concentration. The combination of multi-point monitoring and automatic forced exhaust ensures accurate monitoring and timely response, and can quickly reduce the excessive hydrogen concentration that poses an explosion risk, greatly improving safety and reliability.

[0018] 3. The hydrogen-related high-altitude environmental chamber system of this application, compared with the traditional high-altitude environmental chamber, adds an oxygen concentration detection device to detect oxygen concentration. When the oxygen concentration detected by the oxygen concentration detection device is lower than the hypoxic oxygen concentration at high altitudes, the control system controls the air conditioning system, fresh air system and exhaust suction system to stop operating, to prevent unwarranted abnormal testing and ensure the safety of the entire system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A block diagram of an environmental chamber system provided in an embodiment of this application; Figure 2 This is a structural front view of the environmental chamber system provided in an embodiment of this application; Figure 3 for Figure 2 AA diagram; Figure 4 for Figure 2 DD schematic diagram; In the diagram: 1. Environmental chamber body; 2. Insulation layer; 3. Steel sealing door; 6. Pressure relief valve; 7. Hydrogen concentration detection device; 8. Oxygen concentration detection device; 9. Sealed air door; 10. Forced exhaust fan. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0022] This application provides a hydrogen-related high-altitude environmental chamber system and its testing method, which can simulate the temperature, humidity and low air pressure at high altitudes, and monitor the concentration of hydrogen and oxygen in real time. The system performs multi-point precise monitoring of hydrogen and automatically and promptly handles abnormal hydrogen and oxygen concentrations.

[0023] It is worth noting that in this application, "high altitude" refers to an altitude of 5000m or higher.

[0024] It is worth noting that the purpose of testing hydrogen fuel cells in a hydrogen-related high-altitude environment chamber system is to ensure that hydrogen fuel cells can operate normally in the high-altitude environment with high temperature, humidity, low air pressure and oxygen deficiency, and to assess the performance of hydrogen fuel cells under such conditions.

[0025] like Figures 1-4 As shown, this application discloses a hydrogen-related high-altitude environmental cabin system, which includes an environmental cabin body 1, an air conditioning system, a fresh air system, an exhaust and suction system, a safety system, and a control system.

[0026] Among them, the environmental chamber 1 is used to place the test sample of the hydrogen fuel cell. The air conditioning system is used to regulate the internal temperature of the environmental cabin 1, enabling it to simulate temperatures from -55°C to 85°C and maintain a uniform temperature.

[0027] The fresh air system is used to provide fresh air with different humidity levels inside the environmental chamber 1 to simulate the humidity at high altitudes.

[0028] The exhaust and suction system is used to simulate low air pressure at different altitudes. By adjusting the internal air pressure inside the environmental chamber 1, it can simulate the low air pressure at altitudes above 5000m and maintain uniform air pressure.

[0029] The air conditioning system, fresh air system, and exhaust extraction system are all connected to the environmental chamber 1 and regulate the internal environment of the environmental chamber 1.

[0030] The safety system is used to prevent and control safety risks during testing. It monitors the oxygen concentration in environmental chamber 1 and the hydrogen concentration in environmental chamber 1 at multiple points. It can detect and respond promptly when hydrogen leaks or oxygen is insufficient.

[0031] The control system is used to connect and control the air conditioning system, fresh air system, and exhaust and suction system, simulate the temperature, humidity, and low air pressure of the target altitude environment, and also to receive oxygen and hydrogen concentrations in real time, issue an alarm when any gas concentration is abnormal, and respond promptly.

[0032] This application's hydrogen-related high-altitude environmental chamber system simulates the temperature, humidity, and low atmospheric pressure of high altitudes through an air conditioning system, a fresh air system, and an exhaust / suction system. A safety system monitors the oxygen and hydrogen concentrations within the environmental chamber 1, with multi-point precise monitoring of hydrogen concentration. An alarm is triggered and automatically handled when any gas concentration is abnormal. Compared to traditional high-altitude environmental chambers with single-point gas concentration monitoring, this application's hydrogen-related high-altitude environmental chamber system monitors the hydrogen concentration within the environmental chamber 1 at multiple points, enabling timely and automatic handling even if hydrogen is unevenly distributed within the environmental chamber 1 under low atmospheric pressure. Simultaneously, this application's hydrogen-related high-altitude environmental chamber system monitors oxygen concentration. Unlike traditional high-altitude environmental chambers that lack oxygen concentration monitoring, this application also automatically and promptly handles abnormal oxygen concentrations (i.e., the oxygen concentration in the environmental chamber 1 is lower than the oxygen concentration in the hypoxic environment of high altitudes), ensuring the test's authenticity, reliability, and safety. This application's hydrogen-related high-altitude environmental chamber system enables hydrogen fuel cells to safely and reliably complete testing tasks in the simulated environment with controllable risks.

[0033] Furthermore, in one embodiment, the safety system includes multiple hydrogen concentration detection devices 7 distributed at different locations within the environmental chamber 1. Each hydrogen concentration detection device 7 is connected to the control system and provides real-time feedback on the hydrogen concentration at its location to the control system. The multiple hydrogen concentration detection devices 7 enable accurate measurement even under conditions of uneven hydrogen distribution at low pressure.

[0034] The safety system includes a forced exhaust fan 10 and a corresponding sealing damper 9. The forced exhaust fan 10 is installed in the environmental chamber 1, and the sealing damper 9 is sealed to the forced exhaust fan 10.

[0035] When the hydrogen concentration detected by any one of the multiple hydrogen concentration detection devices 7 exceeds the set safety threshold, the control system automatically opens the sealing damper 9 through the hydraulic system and automatically starts the forced exhaust fan 10 to reduce the hydrogen concentration.

[0036] Specifically, the opening and closing of the sealing damper 9 is controlled by the control system via the hydraulic system.

[0037] Preferably, the forced exhaust fan is an explosion-proof axial flow fan.

[0038] The hydrogen-related high-altitude environmental chamber system of this application has multiple hydrogen concentration detection devices 7 distributed at different positions in the environmental chamber body 1. These multiple hydrogen concentration detection devices 7 can accurately measure the uneven distribution of hydrogen under low pressure conditions. When the hydrogen concentration detected by any hydrogen concentration detection device 7 exceeds the set safety threshold, the control system automatically opens the sealing damper 9 through the hydraulic system and automatically starts the forced exhaust fan 10 to reduce the hydrogen concentration. The combination of multi-point monitoring and automatic forced exhaust ensures accurate monitoring and timely response, and can quickly reduce the excessive hydrogen concentration that poses an explosion risk, greatly improving safety and reliability.

[0039] Furthermore, in one embodiment, the safety system includes an oxygen concentration detection device 8. When the oxygen concentration detected by the oxygen concentration detection device 8 is lower than the oxygen concentration in the hypoxic environment at high altitudes, the control system controls the air conditioning system, the fresh air system, and the exhaust system to stop operating, because the test data is inaccurate and unsafe at this time.

[0040] Specifically, the oxygen concentration in the hypoxia test at high altitude is the oxygen concentration at the actual high altitude, which is a known quantity.

[0041] Preferably, a red alarm is triggered when the hydrogen concentration exceeds a set safety threshold. A yellow alarm is triggered when the oxygen concentration is lower than the oxygen concentration required for high-altitude hypoxia.

[0042] The hydrogen-related high-altitude environmental chamber system of this application, compared with the traditional high-altitude environmental chamber, adds an oxygen concentration detection device 8 to detect oxygen concentration. When the oxygen concentration detected by the oxygen concentration detection device 8 is lower than the hypoxic oxygen concentration at high altitudes, the control system controls the air conditioning system, fresh air system and exhaust suction system to stop operating, to prevent unwarranted abnormal testing and ensure the safety of the entire system.

[0043] Furthermore, in one embodiment, the air conditioning system includes a temperature sensor disposed within the environmental chamber 1; the fresh air system includes a humidity sensor disposed within the environmental chamber 1; and the exhaust suction system includes a pressure sensor disposed within the environmental chamber 1.

[0044] The control system receives data from the temperature sensor, humidity sensor, and pressure sensor in real time, and adjusts the air conditioning system, fresh air system, and exhaust system to simulate the temperature, humidity, and low air pressure at high altitudes.

[0045] Specifically, during the simulation, the hypoxia at high altitudes is accompanied by low air pressure, so there is no need to conduct additional hypoxia simulation. However, in such a hypoxic environment, there may be special circumstances that cause the oxygen concentration to decrease further, so oxygen concentration monitoring is required.

[0046] Furthermore, in one embodiment, the air conditioning system uses an explosion-proof fan, an electric steam boiler, a refrigeration unit, and a heat exchanger.

[0047] The explosion-proof fan is used to circulate the gas inside the environmental chamber 1. It is an internal circulation system, and no external air is added during the circulation process.

[0048] The electric steam boiler uses heated steam as the heat transfer medium, while the refrigeration unit uses 50% pentafluoroethane and 50% trifluoroethane as the refrigerant, enabling more stable refrigeration control. The heat exchanger provides the heat exchange environment, heating the gas inside environmental chamber 1 by exchanging heat with the heat transfer medium, and cooling the gas inside environmental chamber 1 by exchanging heat with the refrigerant.

[0049] The hydrogen-related high-altitude environmental cabin system of this application features a specially designed air conditioning system. The system includes an explosion-proof fan, an electric steam boiler, a refrigeration unit, and a heat exchanger. The explosion-proof fan is used to circulate the gas inside the environmental cabin 1. The heat exchanger is used to exchange heat between the gas inside the environmental cabin 1 and the refrigerant and heat medium to achieve heating and cooling, ensuring a stable cooling effect and a stable and uniform ascent and descent effect.

[0050] Preferably, the fresh air system employs a chemical rotary dehumidification system to simulate the humidity requirements at high altitudes. Specifically, the chemical rotary dehumidification system significantly improves the stability of the simulated humidity through a dynamic adsorption-regeneration cycle and precise control strategy. Its core lies in the honeycomb structure of the rotor, which carries adsorption materials such as silica gel or molecular sieves. Continuous rotation achieves functional switching between the adsorption and regeneration zones: the adsorption zone captures moisture from the air, while the regeneration zone uses high-temperature air to expel moisture from the adsorption material, restoring its moisture absorption capacity. This dynamic balance ensures a stable dew point for the outlet air, especially in low-humidity environments, where the molecular sieve rotor can lower the dew point to -60°C, meeting the needs of high-precision scenarios.

[0051] Furthermore, in one embodiment, the environmental chamber 1 is in the shape of a cuboid shell, and the safety system includes five hydrogen concentration detection devices 7 and one oxygen concentration detection device 8.

[0052] Five hydrogen concentration detection devices 7 are respectively set at the four corners and the center point of the top of the cuboid shell; one oxygen concentration detection device 8 is set next to the center point of the top of the cuboid shell.

[0053] Specifically, the environmental chamber 1 has an explosion-proof sealing rating of Exd IICT1, and the safety system includes five oxygen concentration detection devices 8 for detecting hydrogen leakage concentration.

[0054] Preferably, the load-bearing capacity of the altitude environment chamber is above 1.5T / ㎡, and it has good pressure resistance and heat insulation performance.

[0055] Furthermore, in one embodiment, the environmental chamber 1 is equipped with a steel sealing door 3, which is opened or closed by air circulation control. The steel sealing door 3 is sealed circumferentially by a positive pressure airbag.

[0056] A pressure relief valve is installed on the top of the environmental chamber 1. The pressure relief valve is connected to the positive pressure airbag. When the steel sealing door 3 cannot be opened, the pressure relief valve opens and the positive pressure airbag is deflated.

[0057] Furthermore, in one embodiment, the exhaust suction system includes a high-pressure fan that draws air from the environmental chamber 1 through a pipe and creates the required low air pressure.

[0058] The high-pressure blower is also used to exhaust the waste gas inside the environmental chamber 1.

[0059] Preferably, since the altitude environment chamber needs to simulate an altitude of 5500m, the overall negative pressure inside the chamber can reach 62kPa. Therefore, the altitude environment chamber needs to meet the Exd IICT1 explosion-proof sealing level, that is, the gas leakage rate of the altitude environment chamber at an altitude of 5500m is ≤0.1% volume concentration / hour. To meet the aforementioned requirements, the chamber body 1 is constructed of H-beams, square steel, and steel plates welded together to meet load and safety conditions. All pipelines entering and exiting the altitude environment chamber are sealed using Roxtec sealing modules to form a completely sealed environment, and meet the safety requirements for material strength, stress, welding strength, and deflection calculations of the environment simulation chamber body.

[0060] Furthermore, in one embodiment, the altitude environment chamber system also includes an insulation layer 2, which is made of polyurethane elastomer. The insulation layer 2 is partially attached to the inner surface of the environment chamber body 1, and the insulation layer 2 itself forms a closed cavity to accommodate the test sample. The insulation layer 2 facilitates precise temperature control by the air conditioning system. The insulation layer 2 ensures effective heat insulation, and condensation will not form on the outer surface of the chamber during low-temperature simulation testing.

[0061] The insulation layer 2 includes a double-hinged door, which is located inside the steel sealed door 3. The double-hinged door has an electrically heated observation window that prevents condensation. The electrically heated observation window of the double-hinged door has an electric heating function, making it easy to observe with the naked eye.

[0062] like Figure 3 and Figure 4 As shown, the insulation layer 2 is installed on all four sides of the inner surface of the environmental chamber 1, with two sides spaced apart (the top surface of the insulation layer 2 is spaced apart from the top surface of the environmental chamber 1, and the left surface of the insulation layer 2 is spaced apart from the left surface of the environmental chamber 1), forming two interlayers (upper interlayer and left interlayer). These two interlayers accommodate various components of a certain volume. The majority of the hydrogen concentration detection device 7 is housed in the left interlayer, while its front probe penetrates the insulation layer 2 to measure hydrogen concentration. The oxygen concentration detection device 8 is installed in the same manner. Parts of the pressure relief valve 6, the forced exhaust fan 10, and the sealing damper 9 are housed in the upper interlayer.

[0063] Secondly, this application discloses a testing method based on the aforementioned hydrogen-related high-altitude environmental chamber system, comprising the following steps: The hydrogen fuel cell test sample is placed inside the environmental chamber 1. The control system simulates a high-altitude temperature, humidity and low air pressure through the air conditioning system, fresh air system and exhaust suction system. The hydrogen fuel cell test begins. The safety system acquires one oxygen concentration data and multiple hydrogen concentration data in real time. When any hydrogen concentration data exceeds the set safety threshold, the control system issues an alarm and discharges the gas inside the environmental chamber 1. When the oxygen concentration is lower than the oxygen concentration in the hypoxic environment at high altitudes, the control system controls the air conditioning system, fresh air system, and exhaust system to stop operating.

[0064] Regarding the testing method, further, in one embodiment, the safety system includes multiple hydrogen concentration detection devices 7 distributed at different locations within the environmental chamber 1. Each hydrogen concentration detection device 7 is connected to the control system and provides real-time feedback on the hydrogen concentration at its location to the control system. Multiple hydrogen concentration detection devices 7 enable accurate measurement even under conditions of uneven hydrogen distribution at low pressure.

[0065] The safety system includes a forced exhaust fan 10 and a corresponding sealing damper 9. The forced exhaust fan 10 is installed in the environmental chamber 1, and the sealing damper 9 is sealed to the forced exhaust fan 10.

[0066] When the hydrogen concentration detected by any one of the multiple hydrogen concentration detection devices 7 exceeds the set safety threshold, the control system automatically opens the sealing damper 9 through the hydraulic system and automatically starts the forced exhaust fan 10 to reduce the hydrogen concentration.

[0067] Specifically, the opening and closing of the sealing damper 9 is controlled by the control system via the hydraulic system.

[0068] Preferably, the forced exhaust fan is an explosion-proof axial flow fan.

[0069] The testing method of this application involves multiple hydrogen concentration detection devices 7 distributed at different locations within the environmental chamber 1. These multiple hydrogen concentration detection devices 7 can accurately measure the uneven distribution of hydrogen under low-pressure conditions. When the hydrogen concentration detected by any hydrogen concentration detection device 7 exceeds the set safety threshold, the control system automatically opens the sealing damper 9 via the hydraulic system and automatically starts the forced exhaust fan 10 to reduce the hydrogen concentration. The combination of multi-point monitoring and automatic forced exhaust ensures accurate monitoring and timely response, rapidly reducing the excessive hydrogen concentration that poses an explosion risk and greatly improving safety and reliability.

[0070] Regarding the testing method, further, in one embodiment, the safety system includes an oxygen concentration detection device 8. When the oxygen concentration detected by the oxygen concentration detection device 8 is lower than the oxygen concentration in the hypoxic environment at high altitudes, the control system controls the air conditioning system, the fresh air system, and the exhaust system to stop operating, because the test data is inaccurate and unsafe at this time.

[0071] Specifically, the oxygen concentration in the hypoxia test at high altitude is the oxygen concentration at the actual high altitude, which is a known quantity.

[0072] Preferably, a red alarm is triggered when the hydrogen concentration exceeds a set safety threshold. A yellow alarm is triggered when the oxygen concentration is lower than the oxygen concentration required for high-altitude hypoxia.

[0073] The testing method of this application, compared with the traditional high-altitude environmental chamber, adds an oxygen concentration detection device 8 to detect oxygen concentration. When the oxygen concentration detected by the oxygen concentration detection device 8 is lower than the hypoxic oxygen concentration at high altitude, the control system controls the air conditioning system, fresh air system and exhaust suction system to stop operating, to prevent unwarranted abnormal testing and ensure the safety of the entire system.

[0074] Furthermore, the testing method also includes multi-level control of steps, as detailed below: Level 1 control: When any hydrogen concentration data exceeds 6000ppm or oxygen concentration data is less than 20% (by volume), it indicates that there is a trace amount of flammable gas leak or the oxygen concentration is slightly low in environmental chamber 1. The control system will then issue a yellow warning light alarm through the safety system.

[0075] Level 2 control: When any hydrogen concentration data exceeds 10,000 ppm or oxygen concentration data is less than 19.8%, it indicates that the amount of combustible gas leaking in the environmental chamber 1 is about to reach the upper limit or the oxygen concentration is about to reach the lower limit. The control system automatically opens the sealing damper 9 through the hydraulic system and automatically starts the forced exhaust fan 10 to forcefully exhaust the gas to the outside and reduce the hydrogen concentration.

[0076] Level 3 control: When any hydrogen concentration exceeds 20,000 ppm or oxygen concentration is less than 19.5%, it indicates that the amount of combustible gas leaking into environmental chamber 1 exceeds the upper limit or the oxygen concentration is lower than the lower limit. The control system will then stop the operation of the air conditioning system, fresh air system and exhaust system.

[0077] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0078] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0079] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A hydrogen-based high-altitude environmental cabin system, characterized in that, Include: The environmental chamber (1) is used to place the test sample of the hydrogen fuel cell; An air conditioning system is used to drive the internal circulation of gas in the environmental cabin (1) and regulate the internal temperature of the environmental cabin (1); The fresh air system is used to provide fresh air with different humidity levels inside the environmental cabin (1); An exhaust suction system is used to simulate the low atmospheric pressure at high altitudes inside the environmental chamber (1). Safety system for monitoring the oxygen concentration in the environmental chamber (1) and monitoring the hydrogen concentration in the environmental chamber (1) at multiple points; The control system is used to connect and control the air conditioning system, fresh air system and exhaust system to simulate the temperature, humidity and low air pressure at high altitudes. It is also used to receive oxygen and hydrogen concentrations in real time and issue an alarm when any gas concentration is abnormal.

2. The hydrogen-related high-altitude environmental cabin system as described in claim 1, characterized in that: The safety system includes multiple hydrogen concentration detection devices (7) distributed at different locations in the environmental chamber (1), and the hydrogen concentration detection devices (7) are connected to the control system. The safety system includes a forced exhaust fan (10) and a corresponding sealing damper (9). The forced exhaust fan (10) is installed in the environmental chamber body (1), and the sealing damper (9) is sealed to the forced exhaust fan (10). When the hydrogen concentration detected by any of the multiple hydrogen concentration detection devices (7) exceeds the set safety threshold, the control system automatically opens the sealing damper (9) through the hydraulic system and automatically starts the forced exhaust fan (10) to reduce the hydrogen concentration.

3. The hydrogen-related high-altitude environmental cabin system as described in claim 1, characterized in that: The safety system includes an oxygen concentration detection device (8). When the oxygen concentration detected by the oxygen concentration detection device (8) is less than the oxygen concentration in the hypoxic environment at high altitudes, the control system controls the air conditioning system, fresh air system and exhaust suction system to stop operating.

4. The hydrogen-related high-altitude environmental cabin system as described in claim 1, characterized in that: The air conditioning system includes a temperature sensor installed inside the environmental cabin (1); The fresh air system includes a humidity sensor installed inside the environmental chamber (1); The exhaust suction system includes a pressure sensor installed inside the environmental chamber (1); The control system receives data from the temperature sensor, humidity sensor, and pressure sensor in real time, and adjusts the air conditioning system, fresh air system, and exhaust system to simulate the temperature, humidity, and low air pressure at high altitudes.

5. The hydrogen-related high-altitude environmental cabin system as described in claim 1, characterized in that: The air conditioning system uses an explosion-proof fan, an electric steam boiler, a refrigeration unit, and a heat exchanger; the explosion-proof fan is used to circulate the gas inside the environmental chamber (1); The electric steam boiler uses heated steam as the heat medium; the refrigeration unit uses 50% pentafluoroethane and 50% trifluoroethane as the refrigerant; the heat exchanger is used to exchange heat between the gas in the environmental chamber (1) and the refrigerant and heat medium.

6. The hydrogen-related high-altitude environmental cabin system as described in claim 1, characterized in that: The environmental chamber body (1) is in the shape of a cuboid shell. The safety system includes five hydrogen concentration detection devices (7) and one oxygen concentration detection device (8). The five hydrogen concentration detection devices (7) are respectively set at the four corners and the center point of the top of the cuboid shell. The one oxygen concentration detection device (8) is set next to the center point of the top of the cuboid shell.

7. The hydrogen-related high-altitude environmental cabin system as described in claim 1, characterized in that: The environmental chamber body (1) is equipped with a steel sealing door (3), which is opened or closed by air circulation control; the steel sealing door (3) is sealed with a positive pressure airbag in the circumferential direction; A pressure relief valve is installed on the top of the environmental chamber (1). The pressure relief valve is connected to the positive pressure airbag. When the steel sealing door (3) cannot be opened, the pressure relief valve opens and the positive pressure airbag is deflated.

8. The hydrogen-related high-altitude environmental cabin system as described in claim 4, characterized in that: The exhaust suction system includes a high-pressure fan, which draws air from the environmental chamber (1) through a pipe and forms the required low air pressure; the high-pressure fan is also used to exhaust the exhaust gas inside the environmental chamber (1).

9. The hydrogen-related high-altitude environmental chamber system as described in claim 7, characterized in that: The altitude environment chamber system also includes an insulation layer (2), the material of which is polyurethane elastomer; the insulation layer (2) is partially attached to the inner surface of the environment chamber body (1), and the insulation layer (2) itself forms a closed cavity to accommodate the sample to be tested. The insulation layer (2) includes a double-hinged door, which is located in the inner layer of the steel sealing door (3) and has an electrically heated observation window to prevent condensation.

10. A testing method based on the hydrogen-related high-altitude environmental chamber system of claim 1, characterized in that, Includes the following steps: The hydrogen fuel cell test sample is placed inside the environmental chamber (1), and the control system simulates a high-altitude temperature, humidity and low air pressure through the air conditioning system, fresh air system and exhaust suction system. When the hydrogen fuel cell test begins, the safety system acquires one oxygen concentration data and multiple hydrogen concentration data in real time. When any hydrogen concentration data exceeds the set safety threshold, the control system issues an alarm and discharges the gas inside the environmental chamber (1). When the oxygen concentration is less than the oxygen concentration in the hypoxic environment at high altitudes, the control system controls the air conditioning system, fresh air system and exhaust suction system to stop operating.

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