Hydrogen concentration sensor testing device

Abstract

The utility model relates to a hydrogen concentration sensor testing device which comprises a testing cabin, a hydrogen pipeline, an air pipeline, an exhaust pipeline, a temperature adjusting device and a signal collecting device, a sensor fixing mechanism is arranged in the testing cabin, and the sensor fixing mechanism is provided with an electric connecting structure used for being electrically connected with a hydrogen concentration sensor to be tested. The hydrogen pipeline, the air pipeline and the exhaust pipeline are respectively connected with the test cabin, the hydrogen pipeline is provided with a first flow control device, the air pipeline is provided with a second flow control device, the exhaust pipeline is provided with an exhaust control valve, the temperature adjusting device is arranged in the test cabin to adjust the temperature in the test cabin, and the signal acquisition device is arranged in the test cabin. The signal acquisition device is electrically connected with the electric connection structure. The testing device can be used for testing under the conditions of different hydrogen concentrations and different temperatures, so that various parameters under different testing conditions are obtained, and the testing device has rich testing functions and can meet the testing requirements of different types of hydrogen concentration sensors.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy equipment, in particular to a hydrogen concentration sensor testing device. Background Art

[0002] Hydrogen energy is a readily available, green, low-carbon, and widely applicable secondary energy source. Hydrogen fuel cell vehicles use hydrogen as fuel. The chemical reaction between hydrogen and oxygen produces electricity that drives the vehicle. The only product of this reaction is water, resulting in zero pollution and emissions.

[0003] Hydrogen is flammable and explosive, with an explosive range of 4% to 75% in air. Therefore, ensuring the safe use of hydrogen fuel cell vehicles is crucial, and the most critical step in ensuring the safe use of hydrogen fuel cell vehicles is to detect hydrogen leaks. Therefore, during the design and development of fuel cell vehicles, hydrogen concentration sensors are installed in potential areas where hydrogen leaks may accumulate. These sensors detect hydrogen in the air and issue a warning when the volume concentration of hydrogen in the air reaches or exceeds 2.0% ± 1.0%. When the volume concentration of hydrogen in the air reaches or exceeds 3.0% ± 1.0%, the hydrogen supply is immediately shut off.

[0004] As an important component of fuel cell vehicles, hydrogen concentration sensors are required to have characteristics such as fast response speed, high accuracy, and strong weather resistance. They must be tested before installation. However, the current testing equipment for hydrogen concentration sensors has a single test function and cannot comprehensively test and evaluate the performance of hydrogen concentration sensors. Utility Model Content

[0005] The purpose of the utility model is to provide a hydrogen concentration sensor testing device, so that it can more comprehensively test and evaluate the performance of the hydrogen concentration sensor and meet the testing requirements of various performances of the hydrogen concentration sensor.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A hydrogen concentration sensor testing device, comprising:

[0008] A test chamber, wherein a sensor fixing mechanism is provided in the test chamber, and an electrical connection structure for electrically connecting to a hydrogen concentration sensor to be measured is provided on the sensor fixing mechanism;

[0009] a hydrogen pipeline, wherein a first end of the hydrogen pipeline is used to connect to a hydrogen supply device, a second end of the hydrogen pipeline is communicated with the test chamber, and the hydrogen pipeline is provided with a first flow control device;

[0010] an air pipeline, wherein a first end of the air pipeline is used to connect to an air supply device, a second end of the air pipeline is communicated with the test chamber, and the air pipeline is provided with a second flow control device;

[0011] an exhaust pipeline, the exhaust pipeline being in communication with the test chamber and provided with an exhaust control valve;

[0012] a temperature regulating device, the temperature regulating device being disposed in the test chamber and being used to provide heat and / or coldness to regulate the temperature in the test chamber;

[0013] A signal acquisition device is provided in the test chamber and is electrically connected to the electrical connection structure.

[0014] In one embodiment of the present application, an explosion-proof exhaust device is further provided in the test chamber, and the explosion-proof exhaust device is used to open when the hydrogen concentration in the test chamber exceeds a preset value.

[0015] In one embodiment of the present application, the explosion-proof exhaust device includes an explosion-proof exhaust fan and an exhaust valve, and the exhaust valve is arranged at the air inlet or the air outlet of the explosion-proof exhaust fan.

[0016] In one embodiment of the present application, the exhaust valve includes:

[0017] A rotating shaft, wherein a plurality of the rotating shafts are arranged side by side at intervals in a direction perpendicular to the exhaust direction of the explosion-proof exhaust fan, and the rotating shafts are connected by a linkage device;

[0018] Valve plates, each of the rotating shafts is provided with a valve plate, and when the exhaust valve is in the closed state, the valve plates overlap each other to close the air inlet or air outlet of the explosion-proof exhaust fan, and when the exhaust valve is in the open state, gaps are formed between the valve plates;

[0019] A valve driving device is connected in driving connection with the linkage device.

[0020] In one embodiment of the present application, at least two sensor fixing mechanisms are provided in the test chamber, and the sensor fixing mechanisms are spaced apart from each other, and the signal acquisition device is electrically connected to the electrical connection structure of each sensor fixing mechanism through a plurality of signal acquisition channels.

[0021] In one embodiment of the present application, the hydrogen pipeline and the air pipeline are connected to the first end of the test chamber, the exhaust pipeline is connected to the second end of the test chamber, the second end of the test chamber is the end of the test chamber away from the first end of the test chamber, and at least two of the sensor fixing mechanisms are spaced apart in the direction from the first end to the second end of the test chamber.

[0022] In one embodiment of the present application, the first flow control device includes a first intake valve and a first control flow meter connected in series to the hydrogen pipeline, and the second flow control device includes a second intake valve and a second control flow meter connected in series to the air pipeline.

[0023] In one embodiment of the present application, a power conversion device is further included, which is electrically connected to the electrical connection structure. The power conversion device is used to convert alternating current into direct current, and the output voltage is adjustable.

[0024] In one embodiment of the present application, the temperature regulating device includes:

[0025] a heat output device, the heat output device being used to heat the air in the air duct and / or the bulkhead of the test cabin;

[0026] a cooling output device, the cooling output device being used to cool the air in the air duct and / or the bulkhead of the test chamber;

[0027] A temperature detection sensor, used to detect the temperature in the test chamber;

[0028] A controller is communicatively connected to the temperature detection sensor, the heat output device and the cold output device respectively, and is used to control the operation of the heat output device or the cold output device according to the detection value of the temperature detection sensor.

[0029] In one embodiment of the present application, a thermal insulation layer is provided on the outside of the test chamber.

[0030] It can be seen from the above technical solution that the utility model discloses a hydrogen concentration sensor testing device, which includes a test chamber, a hydrogen pipeline, an air pipeline, an exhaust pipeline, a temperature regulating device and a signal acquisition device, wherein a sensor fixing mechanism is provided in the test chamber, and an electrical connection structure for electrically connecting to the hydrogen concentration sensor to be measured is provided on the sensor fixing mechanism, a first end of the hydrogen pipeline is used to connect to the hydrogen supply device, and the second end is communicated with the test chamber, the hydrogen pipeline is provided with a first flow control device, the first end of the air pipeline is used to connect to the air supply device, and the second end is communicated with the test chamber, the air pipeline is provided with a second flow control device, the exhaust pipeline is communicated with the test chamber, the exhaust pipeline is provided with an exhaust control valve, the temperature regulating device is provided in the test chamber, the temperature regulating device is used to provide heat and / or cold to adjust the temperature in the test chamber, the signal acquisition device is provided in the test chamber, and the signal acquisition device is electrically connected to the electrical connection structure.

[0031] During application, the hydrogen concentration sensor to be measured is fixed on the sensor fixing mechanism, and the hydrogen concentration sensor to be measured is ensured to be electrically connected to the electrical connection structure. According to the hydrogen concentration required by the test item, the flow values ​​of hydrogen and air are set respectively. The hydrogen flow and air flow entering the test chamber are controlled by the first flow control device and the second flow control device, and the exhaust control valve is opened synchronously to allow the exhaust pipe to be conducted for exhaust.

[0032] The hydrogen concentration sensor to be tested detects the hydrogen concentration in the test chamber in real time and promptly adjusts the first and second flow control devices to control the intake flow rates of hydrogen and air, thereby adjusting the hydrogen concentration in the test chamber. After the hydrogen concentration in the test chamber reaches the required concentration value for the test and remains stable, the hydrogen supply device, air supply device, first flow control device, second flow control device, and exhaust control valve are closed. At this point, the hydrogen concentration in the test chamber can meet the test concentration requirements. If there is a test temperature requirement, the temperature in the test chamber is adjusted by the temperature control device. After the temperature in the test chamber reaches the set value and stabilizes, the relevant performance tests of the hydrogen concentration sensor can be carried out. The signal acquisition device is used to collect various parameters of the hydrogen concentration sensor to be tested, such as response time, accuracy, high and low temperature performance, etc.

[0033] It can be seen that the above-mentioned hydrogen concentration sensor testing device is capable of testing the hydrogen concentration sensor under different hydrogen concentrations and different temperature conditions, and can test various parameters of the hydrogen concentration sensor under different hydrogen concentrations and different temperature conditions. It has relatively rich testing functions and can meet the testing needs of different types of hydrogen concentration sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic structural diagram of a hydrogen concentration sensor testing device provided by an embodiment of the present invention;

[0036] Figure 2 A schematic structural diagram of a hydrogen concentration sensor testing device provided by another embodiment of the present invention;

[0037] Figure 3 This is a structural schematic diagram of a hydrogen concentration sensor testing device provided by another embodiment of the present utility model.

[0038] In the picture:

[0039] 1 is the test chamber; 2 is the sensor fixing mechanism; 3 is the hydrogen pipeline; 4 is the first flow control device; 401 is the first air inlet valve; 402 is the first control flow meter; 5 is the air pipeline; 6 is the second flow control device; 601 is the second air inlet valve; 602 is the second control flow meter; 7 is the exhaust pipeline; 8 is the exhaust control valve; 9 is the signal acquisition device; 10 is the explosion-proof exhaust device; 11 is the power conversion device. DETAILED DESCRIPTION

[0040] The core of the utility model is to provide a hydrogen concentration sensor testing device. The structural design of the hydrogen concentration sensor testing device enables it to more comprehensively test and evaluate the performance of the hydrogen concentration sensor, meeting the testing requirements of various performances of the hydrogen concentration sensor.

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] See also Figure 1 , Figure 1 This is a structural diagram of a hydrogen concentration sensor testing device provided by an embodiment of the present utility model.

[0043] The embodiment of the utility model discloses a hydrogen concentration sensor testing device, which includes a test chamber 1, a hydrogen pipeline 3, an air pipeline 5, an exhaust pipeline 7, a temperature regulating device and a signal acquisition device 9.

[0044] Among them, the test chamber 1 itself is made of a material with high strength, corrosion resistance, and the ability to withstand large impact, such as carbon steel, stainless steel, aluminum alloy, polymer material, etc. A sensor fixing mechanism 2 is provided in the test chamber 1, and one or more sensor fixing mechanisms 2 can be provided. When there are multiple sensor fixing mechanisms 2, each sensor fixing mechanism 2 can adopt exactly the same structure, or at least one sensor fixing mechanism 2 can have a different structure from other sensor fixing mechanisms 2, so that the hydrogen concentration sensor test device provided in the embodiment of the present application can fix at least two different types of hydrogen concentration sensors, thereby improving the scope of application. The sensor fixing mechanism 2 is provided with an electrical connection structure for electrically connecting to the hydrogen concentration sensor to be tested, so as to facilitate the connection of the hydrogen concentration sensor to be tested with an external power supply device and a signal acquisition device 9.

[0045] The test chamber 1 includes a chamber body and a chamber door. The chamber door is openably and closably arranged on the chamber body to facilitate the removal and placement of the hydrogen concentration sensor. A locking device is provided between the chamber door and the chamber body to lock the chamber door and the chamber body in a closed state.

[0046] A lighting device is provided in the test chamber 1. The lighting device and the above-mentioned door status detection device are respectively communicated with the controller of the hydrogen concentration sensor test device. The controller obtains the door status in real time, and automatically turns on the lighting device when the door is in the open state, and automatically cuts off the power supply of the lighting device when the door is in the closed state.

[0047] Specifically, the status detection device can be arranged between the locking device or the cabin door and the cabin body. The status detection device includes but is not limited to a micro switch, a contact switch, and an infrared sensor.

[0048] The first end of the hydrogen pipeline 3 is used to connect to the hydrogen supply device, and the second end is connected to the test cabin 1. The hydrogen supply device includes but is not limited to a hydrogen storage tank or a hydrogen production equipment. The hydrogen pipeline 3 is provided with a first flow control device 4. The first end of the air pipeline 5 is used to connect to the air supply device, and the second end is connected to the test cabin 1. The air supply device includes but is not limited to a blower. The air pipeline 5 is provided with a second flow control device 6. The exhaust pipeline 7 is connected to the test cabin 1, and the exhaust pipeline 7 is provided with an exhaust control valve 8. The temperature regulating device is provided in the test cabin 1, and the temperature regulating device is used to provide heat and / or coldness to adjust the temperature in the test cabin 1. The signal acquisition device 9 is provided in the test cabin 1, and the signal acquisition device 9 is electrically connected to the electrical connection structure.

[0049] A filter device may be provided between the air supply device and the air pipeline 5 to filter impurities in the air and prevent the impurities in the air from being brought into the test chamber 1 .

[0050] In order to prevent the gas in the test chamber 1 from flowing back along the hydrogen pipeline 3 and the air pipeline 5 and causing impact on the first flow control device 4 and the second flow control device 6, in one embodiment of the present application, the hydrogen pipeline 3 is provided with a first one-way valve downstream of the first flow control device 4, and the first one-way valve is unidirectional along the hydrogen pipeline 3 to the test chamber 1, and the air pipeline 5 is provided with a second one-way valve downstream of the second flow control device 6, and the second one-way valve is unidirectional along the air pipeline 5 to the test chamber 1.

[0051] During use, the hydrogen concentration sensor to be measured is fixed on the sensor fixing mechanism 2, and the hydrogen concentration sensor to be measured is ensured to be electrically connected to the electrical connection structure. According to the hydrogen concentration required by the test item, the flow values ​​of hydrogen and air are set respectively. The hydrogen flow and air flow entering the test chamber 1 are controlled by the first flow control device 4 and the second flow control device 6, and the exhaust control valve 8 is opened synchronously to allow the exhaust pipe 7 to be conducted for exhaust.

[0052] The hydrogen concentration sensor to be tested detects the hydrogen concentration within the test chamber 1 in real time and promptly adjusts the first flow control device 4 and the second flow control device 6 to control the intake flow of hydrogen and air, thereby adjusting the hydrogen concentration within the test chamber 1 so that the hydrogen concentration within the test chamber 1 reaches the set value. After the hydrogen concentration within the test chamber reaches the concentration value required for the test and remains stable, the hydrogen supply device, the air supply device, the first flow control device 4, the second flow control device 6, and the exhaust control valve 8 are closed. At this point, the hydrogen concentration within the test chamber 1 can meet the concentration requirements of the test. If there is a test temperature requirement, the temperature within the test chamber 1 is adjusted using the temperature control device. After the temperature within the test chamber 1 reaches the set value and stabilizes, the relevant performance test of the hydrogen concentration sensor can be carried out. The signal acquisition device 9 is used to collect various parameters of the hydrogen concentration sensor to be tested, such as response time, accuracy, high and low temperature performance, etc. in real time.

[0053] Compared with the existing technology, the hydrogen concentration sensor testing device provided by the embodiment of the utility model can test the hydrogen concentration sensor under different hydrogen concentrations and different temperature conditions. It can test various parameters of the hydrogen concentration sensor under different hydrogen concentrations and different temperature conditions, such as analog voltage, PWM, CAN and other signals. It has relatively rich testing functions and can meet the testing needs of different types of hydrogen concentration sensors.

[0054] See also Figure 2 , Figure 2 This is a structural schematic diagram of a hydrogen concentration sensor testing device provided in another embodiment of the present invention. The hydrogen concentration sensor testing device also includes an explosion-proof exhaust device 10 arranged in the test chamber 1. The explosion-proof exhaust device 10 is used to open when the hydrogen concentration in the test chamber 1 exceeds a preset value. It can be foreseen that during the test process, although the hydrogen flow rate and the air flow rate can be adjusted in real time by the first flow control valve and the second flow control valve, the exhaust can also be exhausted by opening the exhaust control valve 8 to control the hydrogen concentration in the test chamber 1. However, in order to ensure safety during the test process and avoid accidents, in one embodiment of the present application, an explosion-proof exhaust device 10 is additionally provided to deal with emergencies and improve the safety of the hydrogen concentration sensor testing device.

[0055] Specifically, in one embodiment, the explosion-proof exhaust device 10 includes an explosion-proof exhaust fan and an exhaust valve. The exhaust valve is arranged at the air inlet or air outlet of the explosion-proof exhaust fan. The exhaust valve and the explosion-proof exhaust fan can be opened and closed independently of each other.

[0056] In the above embodiment, the exhaust valve includes a rotating shaft, a valve plate and a valve driving device, wherein a plurality of rotating shafts are arranged side by side at intervals along a direction perpendicular to the exhaust direction of the explosion-proof exhaust fan, and each rotating shaft is connected by a linkage device. A valve plate is provided on each rotating shaft. When the exhaust valve is in the closed state, the valve plates overlap each other to close the air inlet or air outlet of the explosion-proof exhaust fan. When the exhaust valve is in the open state, a gap is formed between the valve plates. The valve driving device is connected to the linkage device in a transmission manner. A sealing structure is provided between the valve plate and the valve body of the exhaust valve to prevent gas leakage inside the test chamber 1 when the exhaust valve is in the closed state. The valve body of the exhaust valve and the shell of the explosion-proof exhaust fan are an integrated structure.

[0057] To further optimize the above technical solution, the hydrogen concentration sensor testing device also includes a pressure detection device, which is used to detect the pressure in the test chamber 1. The pressure detection device is communicatively connected to the controller of the hydrogen concentration sensor testing device. The controller obtains the pressure in the test chamber 1 in real time through the pressure detection device, and when the pressure in the test chamber 1 exceeds a preset value, the controller controls the exhaust valve and / or exhaust pipe 7 to open to achieve rapid pressure relief in the test chamber 1 and ensure the safety of the test process. When the hydrogen concentration sensor to be tested detects that the hydrogen concentration in the test chamber 1 exceeds the limit, the first flow control device 4 is closed, the hydrogen supply is stopped, and the exhaust valve and explosion-proof exhaust fan are opened at the same time to discharge the gas in the test chamber 1 as soon as possible and quickly reduce the hydrogen concentration in the test chamber 1 to below the safety limit.

[0058] See also Figures 1 to 3 In one embodiment of the present application, at least two sensor fixing mechanisms 2 are provided in the test chamber 1, and the sensor fixing mechanisms 2 are arranged at intervals, and the signal acquisition device 9 is electrically connected to the electrical connection structure of each sensor fixing mechanism 2 through multiple signal acquisition channels.

[0059] To further optimize the above technical solution, the hydrogen pipeline 3 and the air pipeline 5 are connected to the first end of the test chamber 1, and the exhaust pipeline 7 is connected to the second end of the test chamber 1. The second end of the test chamber 1 is the end of the test chamber 1 away from the first end of the test chamber 1. At least two sensor fixing mechanisms 2 are arranged at intervals along the direction from the first end to the second end of the test chamber 1, so as to reflect the distribution state of the hydrogen concentration in the test chamber 1 and ensure that the gas in the test chamber 1 is evenly mixed.

[0060] like Figures 1 to 3As shown, the first flow control device 4 includes a first intake valve 401 and a first control flowmeter 402 connected in series to the hydrogen pipeline 3, and the second flow control device 6 includes a second intake valve 601 and a second control flowmeter 602 connected in series to the air pipeline 5. The first intake valve 401, the second intake valve 601 and the exhaust control valve 8 are solenoid valves with a switch function for connecting or cutting off each pipeline. The first control flowmeter 402 and the second control flowmeter 602 can detect and adjust the flow.

[0061] like Figure 3 As shown, the hydrogen concentration sensor testing device also includes a power conversion device 11, which is electrically connected to the electrical connection structure. The power conversion device 11 is used to convert alternating current into direct current, and the output voltage is adjustable. Specifically, the output range of the power conversion device 11 is 0~36V, which meets the working voltage requirements of different types of hydrogen concentration sensors.

[0062] In one embodiment of the present application, the temperature regulating device includes a heat output device, a cold output device, a temperature detection sensor and a controller, wherein the heat output device is used to heat the air in the air pipe 5 and / or the wall of the test chamber 1, the heat output device includes but is not limited to an electric heating device, the cold output device is used to cool the air in the air pipe 5 and / or the wall of the test chamber 1, the cold output device includes but is not limited to a semiconductor refrigeration device, a compressor refrigerant refrigeration device, the temperature detection sensor is used to detect the temperature in the test chamber 1, the controller is respectively communicated with the temperature detection sensor, the heat output device and the cold output device, the controller is used to control the operation of the heat output device or the cold output device according to the detection value of the temperature detection sensor, the controller can be a hydrogen concentration sensor test device, or it can be an independently set controller.

[0063] In order to reduce the heat exchange between the test chamber 1 and the external environment and reduce energy consumption, in one embodiment of the present application, a thermal insulation layer is provided on the outside of the test chamber 1.

[0064] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0065] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help you understand the core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A hydrogen concentration sensor testing device, characterized in that: include: A test chamber, wherein a sensor fixing mechanism is provided in the test chamber, and an electrical connection structure for electrically connecting to a hydrogen concentration sensor to be measured is provided on the sensor fixing mechanism; a hydrogen pipeline, wherein a first end of the hydrogen pipeline is connected to a hydrogen supply device, a second end of the hydrogen pipeline is connected to the test chamber, and the hydrogen pipeline is provided with a first flow control device; an air pipeline, wherein a first end of the air pipeline is used to connect to an air supply device, a second end of the air pipeline is communicated with the test chamber, and the air pipeline is provided with a second flow control device; an exhaust pipeline, the exhaust pipeline being in communication with the test chamber and provided with an exhaust control valve; a temperature regulating device, the temperature regulating device being disposed in the test chamber and being used to provide heat and / or coldness to regulate the temperature in the test chamber; A signal acquisition device is provided in the test chamber and is electrically connected to the electrical connection structure.

2. The hydrogen concentration sensor testing device according to claim 1, characterized in that: It also includes an explosion-proof exhaust device arranged in the test chamber, and the explosion-proof exhaust device is used to open when the hydrogen concentration in the test chamber exceeds a preset value.

3. The hydrogen concentration sensor testing device according to claim 2, characterized in that: The explosion-proof exhaust device includes an explosion-proof exhaust fan and an exhaust valve, and the exhaust valve is arranged at the air inlet or the air outlet of the explosion-proof exhaust fan.

4. The hydrogen concentration sensor testing device according to claim 3, characterized in that: The exhaust valve comprises: A rotating shaft, wherein a plurality of the rotating shafts are arranged side by side at intervals in a direction perpendicular to the exhaust direction of the explosion-proof exhaust fan, and the rotating shafts are connected by a linkage device; Valve plates, each of the rotating shafts is provided with a valve plate, and when the exhaust valve is in the closed state, the valve plates overlap each other to close the air inlet or air outlet of the explosion-proof exhaust fan, and when the exhaust valve is in the open state, gaps are formed between the valve plates; A valve driving device is connected in driving connection with the linkage device.

5. The hydrogen concentration sensor testing device according to any one of claims 1 to 4, characterized in that: At least two sensor fixing mechanisms are provided in the test chamber, and the sensor fixing mechanisms are arranged at intervals. The signal acquisition device is electrically connected to the electrical connection structure of each sensor fixing mechanism through a plurality of signal acquisition channels.

6. The hydrogen concentration sensor testing device according to claim 5, characterized in that: The hydrogen pipeline and the air pipeline are connected to the first end of the test chamber, and the exhaust pipeline is connected to the second end of the test chamber. The second end of the test chamber is the end of the test chamber away from the first end of the test chamber, and at least two sensor fixing mechanisms are arranged at intervals along the direction from the first end to the second end of the test chamber.

7. The hydrogen concentration sensor testing device according to any one of claims 1 to 4, characterized in that: The first flow control device includes a first air intake valve and a first control flow meter connected in series to the hydrogen pipeline, and the second flow control device includes a second air intake valve and a second control flow meter connected in series to the air pipeline.

8. The hydrogen concentration sensor testing device according to any one of claims 1 to 4, characterized in that: It also includes a power conversion device, which is electrically connected to the electrical connection structure. The power conversion device is used to convert alternating current into direct current, and the output voltage is adjustable.

9. The hydrogen concentration sensor testing device according to any one of claims 1 to 4, characterized in that: The temperature regulating device comprises: a heat output device, the heat output device being used to heat the air in the air duct and / or the bulkhead of the test cabin; a cooling output device, the cooling output device being used to cool the air in the air duct and / or the bulkhead of the test chamber; A temperature detection sensor, used to detect the temperature in the test chamber; A controller is communicatively connected to the temperature detection sensor, the heat output device and the cold output device respectively, and is used to control the operation of the heat output device or the cold output device according to the detection value of the temperature detection sensor.

10. The hydrogen concentration sensor testing device according to any one of claims 1 to 4, characterized in that: A thermal insulation layer is provided outside the test chamber.

Images