Automatic temperature plugging durability test bench for hydrogen filling port

Abstract

The utility model discloses a hydrogenation port automatic temperature plugging endurance test bench, which comprises a test bench, an environment box is arranged on the upper part of the test bench and is fixedly connected with the test bench, a slide rail is fixedly arranged on the upper part of the test bench, and a movable seat is arranged on the surface of the slide rail. A pushing air cylinder fixedly installed with the test board is arranged between the sliding rails, a push rod is arranged at the power output end of the pushing air cylinder, and the push rod is connected with the movable seat. According to the utility model, by simulating the actual working environment temperature, the automatic plugging test and accurate data recording and analysis are realized, the test efficiency and accuracy are greatly improved, an automatic control system is adopted, the manual operation error is reduced, and reliable technical support is provided for the performance evaluation and improvement of the hydrogenation port 17.

Description

Technical Field

[0001] This utility model relates to the technical field of hydrogen filling port insertion and removal durability test bench, and more specifically to an automatic temperature insertion and removal durability test bench for hydrogen filling ports. Background Technology

[0002] With the rapid development of hydrogen energy technology, the hydrogen refueling port, as a core component of the hydrogen energy system, plays a decisive role in ensuring the safe and efficient operation of the system, particularly in terms of its reliability, sealing, and durability. Therefore, periodic temperature and insertion / removal durability testing of the hydrogen refueling port is crucial. Traditional hydrogen refueling port testing equipment is mostly single-function and has many shortcomings in simulating extreme temperatures at the refueling port and in data acquisition and analysis. Therefore, a new technical solution is needed to address these issues. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides an automatic temperature insertion and removal durability test bench for hydrogen filling ports, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an automatic temperature insertion and removal durability test bench for hydrogen filling ports, comprising: a test bench, an environmental chamber fixedly connected to the test bench at its upper part, a fixedly mounted slide rail at the upper part of the test bench with a movable seat on the surface of the slide rail, a push cylinder fixedly mounted to the test bench between the slide rails with a push rod at the power output end of the push cylinder, the push rod connected to the movable seat, a nozzle mounting bracket at the upper part of the movable seat with a hydrogen filling gun inside the nozzle mounting bracket, the hydrogen filling gun and the nozzle mounting bracket being interlocked, a fixed seat at the upper part of the test bench with a hydrogen filling port on the inner side of the fixed seat, the hydrogen filling port and the hydrogen filling gun corresponding to each other, a locking groove on the surface of the hydrogen filling gun, a lifting cylinder at the upper part of the fixed seat with a telescopic rod at the power output end of the lifting cylinder, a locking element at the lower part of the telescopic rod connected to the locking groove.

[0005] In a preferred embodiment of this utility model, the environmental chamber includes a heating element, a cooling device, and a temperature sensor.

[0006] In a preferred embodiment of this utility model, the surface of the environmental chamber is provided with a protective door, which is a double-door structure, and a latch is provided at the connection of the protective door.

[0007] In a preferred embodiment of the present invention, the surface of the protective door is provided with a fixedly installed handle and an observation window is provided on the surface of the protective door, the observation window being provided with transparent tempered glass.

[0008] In a preferred embodiment of this utility model, the inlet and outlet ports of the push cylinder are equipped with control solenoid valves, and the inlet and outlet ports of the push cylinder are connected to the driving air source.

[0009] In a preferred embodiment of the present invention, the upper part of the movable seat is provided with a fixed frame and the inside of the fixed frame is provided with a threaded rod. The lower part of the threaded rod is provided with a fastener and the fastener is in contact with the hydrogenation gun. The upper end of the threaded rod is provided with a connecting rod.

[0010] In a preferred embodiment of this utility model, a limit sensor is provided at the lower part of the hydrogen filling port and at the corresponding position of the nozzle mounting bracket.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This invention features an environmental chamber mounted on the upper part of a test bench. The environmental chamber includes a heating element, a cooling device, and a temperature sensor to simulate the actual working temperature conditions of the hydrogen filling port. A fixed slide rail is mounted on the upper part of the test bench, and a movable seat is provided on the surface of the slide rail. A push cylinder, fixedly mounted to the test bench, is positioned between the slide rails, and a push rod is provided at the power output end of the push cylinder. The push rod is connected to the movable seat. Control solenoid valves are provided at both the inlet and outlet of the push cylinder to control its extension and retraction. The inlet and outlet of the push cylinder are connected to a driving gas source. A nozzle mounting bracket is mounted on the upper part of the movable seat, and a hydrogen filling gun is installed inside the nozzle mounting bracket. The hydrogen filling gun and the nozzle mounting bracket are interlocked. A fixed base is mounted on the upper part of the test bench, and a hydrogen filling port is provided on the inner side of the fixed base. The hydrogen inlet and the hydrogen refueling nozzle correspond to each other. A push cylinder can move the movable seat on the slide rail surface, thereby connecting or disconnecting the hydrogen refueling nozzle from the hydrogen inlet, realizing automatic insertion and removal. A locking groove is provided on the surface of the hydrogen refueling nozzle. A lifting cylinder is provided on the upper part of the fixed seat, and a telescopic rod is provided on the power output end of the lifting cylinder. A locking component is provided on the lower part of the telescopic rod, and the locking component is connected to the locking groove. This setting can lock and fix the hydrogen refueling nozzle. The durability is tested by repeatedly inserting and removing the nozzle and recording the number of insertions and removals. At the same time, a pressure sensor installed in conjunction with the locking component and the push cylinder is added to determine the insertion and removal force. The device adopts an automatic control system, which can realize the simulation of temperature environment and automatic cyclic testing of insertion and removal force and number of times, which greatly improves the testing efficiency and accuracy and reduces human operation error. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the gun head mounting bracket structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the hydrogenation port structure of this utility model.

[0017] In the diagram: 1. Test bench; 2. Environmental chamber; 3. Protective door; 4. Handle; 5. Observation window; 6. Push cylinder; 7. Slide rail; 8. Movable shaft; 9. Gun head mounting bracket; 10. Hydrogen refueling gun; 11. Fixed base; 12. Lifting cylinder; 13. Fixed frame; 14. Threaded rod; 15. Fastener; 16. Connecting rod; 17. Hydrogen refueling port; 18. Limit sensor; 19. Telescopic rod; 20. Locking component. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-4 This utility model provides a technical solution: an automatic temperature insertion and removal durability test bench for hydrogen filling ports.

[0020] Regarding the problems mentioned above: traditional hydrogen refueling port testing equipment is mostly single-function and has many shortcomings in simulating extreme temperatures at hydrogen refueling ports and in data acquisition and analysis.

[0021] The solution is as follows: An automatic temperature insertion and removal durability test bench for hydrogen filling ports includes: a test bench 1, an environmental chamber 2 fixedly connected to the test bench 1 on its upper part, a fixedly mounted slide rail 7 on the upper part of the test bench 1, a movable seat 8 on the surface of the slide rail 7, a push cylinder 6 fixedly mounted to the test bench 1 between the slide rails 7, a push rod on the power output end of the push cylinder 6, the push rod being connected to the movable seat 8, a nozzle mounting bracket 9 on the upper part of the movable seat 8, a hydrogen filling gun 10 inside the nozzle mounting bracket 9, the hydrogen filling gun 10 and the nozzle mounting bracket 9 being interlocked, and a fixed seat 11 on the upper part of the test bench 1. A hydrogen filling port 17 is provided on the inner side of the test bench 1, which corresponds to the hydrogen filling gun 10. The surface of the hydrogen filling gun 10 is provided with a locking groove. A lifting cylinder 12 is provided on the upper part of the fixed base 11, and a telescopic rod 19 is provided on the power output end of the lifting cylinder 12. A locking element 20 is provided on the lower part of the telescopic rod 19, and the locking element 20 is connected to the locking groove. An environmental chamber 2 is provided on the upper part of the test bench 1, and the environmental chamber 2 includes a heating element, a cooling device, and a temperature sensor to simulate the temperature conditions of the actual working environment of the hydrogen filling port 17. A fixedly installed slide rail 7 is provided on the upper part of the test bench 1, and a movable seat 8 is provided on the surface of the slide rail 7. A push cylinder fixedly installed with the test bench 1 is provided between the slide rails 7. 6. A push rod is provided at the power output end of the push cylinder 6, which is connected to the movable seat 8. Control solenoid valves are provided at both the inlet and outlet of the push cylinder 6 to control its extension and retraction. The inlet and outlet of the push cylinder 6 are connected to the driving air source. A nozzle mounting bracket 9 is provided on the upper part of the movable seat 8, and a hydrogen filling gun 10 is installed inside the nozzle mounting bracket 9. The hydrogen filling gun 10 and the nozzle mounting bracket 9 are interlocked. A fixed seat 11 is provided on the upper part of the test platform 1, and a hydrogen filling port 17 is provided on the inner side of the fixed seat 11. The hydrogen filling port 17 corresponds to the hydrogen filling gun 10. The push cylinder 6 can push the movable seat 8 to move on the surface of the slide rail 7, thereby connecting or disconnecting the hydrogen filling gun 10 from the hydrogen filling port 17. The device enables automatic insertion and removal. A locking groove is provided on the surface of the hydrogen refueling gun 10. A lifting cylinder 12 is provided on the upper part of the fixed base 11, and a telescopic rod 19 is provided on the power output end of the lifting cylinder 12. A locking element 20 is provided on the lower part of the telescopic rod 19, and the locking element 20 is connected to the locking groove. This setting can lock and fix the hydrogen refueling gun 10. Its durability is tested by repeatedly inserting and removing the gun and recording the number of insertions and removals. At the same time, a pressure sensor installed in conjunction with the locking element 20 and the pushing cylinder 6 is added to determine the insertion and removal force. The device adopts an automatic control system, which can realize the simulation of temperature environment and automatic cyclic testing of insertion and removal force and number of times, which greatly improves the testing efficiency and accuracy and reduces human operation error.

[0022] Further improvements, such asFigure 1 As shown: The environmental chamber 2 includes a heating element, a cooling device, and a temperature sensor. This setup can simulate various temperature conditions that the hydrogen filling port 17 may encounter in actual working environments, thereby more accurately evaluating the performance and durability of the hydrogen filling port 17 at different temperatures. The heating element and cooling device can provide high-temperature and low-temperature environments respectively, while the temperature sensor ensures the accuracy of temperature control.

[0023] Further improvements, such as Figure 1 As shown: The surface of the environmental chamber 2 is provided with a protective door 3, and the protective door 3 is a double door structure. The connection of the protective door 3 is provided with a latch. The double door structure of the protective door 3 makes it easy for operators to quickly and safely open and close the environmental chamber 2 for sample installation and disassembly.

[0024] Further improvements, such as Figure 1 As shown: The protective door 3 has a fixedly installed handle 4 on its surface and an observation window 5 on its surface. The observation window 5 contains transparent tempered glass. The handle 4 allows the operator to easily open and close the protective door 3, improving operational convenience. The observation window 5 and the transparent tempered glass allow the operator to observe the testing process without opening the protective door 3, ensuring safety while facilitating real-time monitoring of the testing status.

[0025] Further improvements, such as Figure 2 As shown: The inlet and outlet ports of the push cylinder 6 are equipped with control solenoid valves. The inlet and outlet ports of the push cylinder 6 are connected to the driving gas source. The control solenoid valves can precisely control the extension and retraction of the push cylinder 6, thereby achieving precise control of the insertion and removal of the hydrogen refueling gun 10.

[0026] Further improvements, such as Figure 3 As shown: The upper part of the movable seat 8 is provided with a fixed frame 13 and the inside of the fixed frame 13 is provided with a threaded rod 14. The lower part of the threaded rod 14 is provided with a fastener 15 and the fastener 15 is in contact with the hydrogen refueling gun 10. The upper end of the threaded rod 14 is provided with a connecting rod 16. By rotating the threaded rod 14, the fastener 15 is lowered and comes into contact with the hydrogen refueling gun 10 to effectively fix it.

[0027] Further improvements, such as Figure 4 As shown: A limit sensor 18 is provided at the lower part of the hydrogen filling port 17 and at the corresponding position of the nozzle mounting bracket 9. The limit sensor 18 can accurately detect the relative position of the hydrogen filling gun 10 and the hydrogen filling port 17, thereby ensuring the accuracy and safety of the insertion and removal action.

[0028] To further demonstrate the novelty and feasibility of this scheme, the following quantitative values ​​obtained directly from testing and practical applications are provided.

[0029] The advantages of this invention are highlighted by comparison with traditional hydrogen refueling port testing equipment.

[0030]

[0031] Data Description

[0032] 1. Temperature simulation capability: Covers actual operating conditions, improving test reliability.

[0033] Traditional equipment can only be tested at room temperature, and cannot simulate the performance of hydrogen energy systems in extremely cold (such as -40℃ startup) or high temperature (such as 80℃ operation) environments, resulting in test results that are out of touch with actual application scenarios.

[0034] This invention achieves wide temperature range control (accuracy ±1℃) from -40℃ to 80℃ using heating elements, cooling devices, and temperature sensors in an environmental chamber, simulating the working environment of a vehicle in different climate zones. For example:

[0035] Low-temperature scenario: Verify the sealing performance and insertion / removal smoothness of the hydrogen filling port under extreme cold conditions;

[0036] High-temperature scenario: Test the aging resistance and structural stability of materials at high temperatures.

[0037] Data comparison shows that the temperature range has been expanded by 4 times and the accuracy has been improved by 50%, making the test closer to actual working conditions and the results more valuable for reference.

[0038] 2. Automated plugging and unplugging: Highly efficient and precise, reducing labor costs.

[0039] Traditional equipment relies on manual insertion and removal, which is not only inefficient (≤10 times / minute) but also suffers from poor consistency due to variations in the operator's force and speed. For example, the insertion and removal force during manual operation can fluctuate by ±5N, resulting in large dispersion in test data.

[0040] This invention achieves automatic insertion and removal by using a push cylinder in conjunction with a control solenoid valve, increasing the frequency to ≥30 times / minute and achieving a positioning accuracy of ±0.5mm. Simultaneously, the lifting cylinder and locking mechanism ensure precise alignment of the hydrogen refueling gun and hydrogen refueling port during insertion and removal, avoiding interface wear errors caused by manual operation.

[0041] Taking 1,000 insertion and removal tests as an example, traditional equipment requires 16.7 hours, while this invention only requires 5.6 hours, improving efficiency by 200%. At the same time, it eliminates the force deviation of manual operation and significantly improves data repeatability.

[0042] 3. Data Acquisition and Analysis: Automated recording improves accuracy.

[0043] Traditional equipment relies on manual recording of the number of insertions and removals, which is prone to counting errors due to fatigue (error ±5 times), and cannot monitor the insertion and removal force in real time, making it difficult to assess the mechanical performance degradation of the interface.

[0044] This invention uses a limit sensor and a pressure sensor to achieve automatic counting of insertion and removal times (error 0 times) and real-time monitoring of force (accuracy ±0.5N).

[0045] For example, the limit sensor accurately detects the docking position between the hydrogen refueling nozzle and the hydrogen refueling port, ensuring consistent insertion and removal strokes each time;

[0046] Pressure sensors record changes in force during insertion and removal, which can be used to analyze the impact of interface wear on force (such as whether the insertion and removal force increases abnormally when wear intensifies).

[0047] Data comparison shows that the error in the number of times was reduced to 0, and the intensity monitoring was introduced from scratch, providing a quantitative basis for the durability assessment of the hydrogen filling port.

[0048] 4. Testing efficiency and durability: Long-cycle testing, covering extreme operating conditions.

[0049] Traditional equipment is inefficient and has limited functionality, making it difficult to complete a high number of durability tests (up to 5000 times) and unable to simulate the alternating hot and cold scenarios in actual use by incorporating temperature cycling.

[0050] This invention supports 50,000 ultra-long-cycle tests through an automated system, and can simultaneously perform temperature cycling (such as periodic changes from -40℃ to 80℃ to -40℃) during the test to simulate the hydrogen refueling port usage scenarios of vehicles under different seasons and operating conditions. For example:

[0051] In 50,000 tests, a temperature change cycle can be set every 1,000 insertions and removals to observe the effect of temperature changes on the interface sealing performance.

[0052] The number of tests is increased tenfold, and the combined temperature-insertion cycle makes the evaluation more comprehensive, enabling the early detection of potential faults that traditional equipment cannot detect (such as accelerated aging of seals due to temperature fluctuations).

[0053] 5. Human error control: Automated systems are dominant, improving reliability.

[0054] The manual operation error rate of traditional equipment is ≥15%, mainly due to operator fatigue and differences in operating habits. For example:

[0055] During prolonged testing, the force applied during manual insertion and removal may gradually decrease, leading to looser interface connections and affecting the sealing test results.

[0056] When manually recording data, distraction may lead to missed or incorrect entries.

[0057] This invention employs an automatic control system with an error rate ≤2%. It ensures consistency throughout the testing process by pre-setting parameters (such as insertion / removal frequency and temperature profile). For example:

[0058] The solenoid valve of the push cylinder precisely controls the cylinder stroke, and the force fluctuation for each insertion and extraction is ≤±0.5N;

[0059] Data is automatically recorded and reports are generated, avoiding errors from manual data entry.

[0060] The error rate was reduced by 86.7%, making the test results more reliable and providing credible technical support for improving the performance of the hydrogen filling port.

[0061] The above data intuitively demonstrates the core advantages of this utility model in temperature simulation, automated control, and data acquisition. Through technological innovation, it solves the problems of limited functionality and insufficient precision of traditional equipment, significantly improves the efficiency and accuracy of hydrogen refueling port testing, and provides key technical support for the performance optimization of core components of hydrogen energy systems.

[0062] Working Principle: The operator first opens the protective door 3 and installs the hydrogen refueling gun 10 on the nozzle mounting bracket 9. By adjusting the threaded rod 14 and fastener 15, the operator ensures that the hydrogen refueling gun 10 is precisely aligned with the hydrogen refueling port 17. Then, the protective door 3 is closed and the latch is locked to ensure accurate preparation before the test, laying a solid foundation for the subsequent testing process. According to the test requirements, the operator sets the target temperature inside the environmental chamber 2 through the controller. The heating element and cooling device start working, adjusting the temperature inside the environmental chamber 2 to the preset value. The temperature sensor monitors the temperature change in real time to ensure the accuracy of temperature control, simulating the actual working temperature conditions of the hydrogen refueling port 17, improving the accuracy and reliability of the test. The operator starts the test program, and the control system controls the extension and retraction of the push cylinder 6 according to the preset test parameters. The push cylinder 6 pushes the movable seat 8 to move on the slide rail 7 through the push rod, thereby connecting or disconnecting the hydrogen refueling gun 10 from the hydrogen refueling port 17. Limit sensor 18 monitors the position of hydrogen refueling nozzle 10 in real time to ensure the accuracy and safety of insertion and removal actions. Simultaneously, lifting cylinder 12 locks and fixes hydrogen refueling nozzle 10 via telescopic rod 19 and locking element 20 to test its durability. Pressure sensor, in conjunction with locking element 20, monitors insertion and removal force and records relevant data to achieve automatic insertion and removal testing of hydrogen refueling port 17, improving testing efficiency and accuracy. By recording the number of insertions and removals and the insertion and removal force, the durability and performance of hydrogen refueling port 17 are evaluated. Data recording and analysis are performed during the test. The control system records test data in real time, including temperature, number of insertions and removals, and insertion and removal force. After the test, the operator can view and export the test report through the controller, which provides detailed test data and analysis reports, providing strong support for the performance evaluation and improvement of the hydrogen filling port 17. The automatic temperature insertion and removal durability test bench of the hydrogen filling port 17 of this utility model greatly improves the testing efficiency and accuracy by simulating the actual working environment temperature, realizing automatic insertion and removal testing, and accurate data recording and analysis. The use of an automatic control system reduces human operation error and provides reliable technical support for the performance evaluation and improvement of the hydrogen filling port 17.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0064] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc., are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0065] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic temperature insertion and removal durability test bench for hydrogen filling ports, characterized in that: include: A test bench (1) is provided with an environment chamber (2) on its upper part and the environment chamber (2) is fixedly connected to the test bench (1). A slide rail (7) is fixedly installed on the upper part of the test bench (1) and a movable seat (8) is provided on the surface of the slide rail (7). A push cylinder (6) is fixedly installed between the slide rails (7) and is provided with a push rod at the power output end of the push cylinder (6). The push rod is connected to the movable seat (8). A nozzle mounting bracket (9) is provided on the upper part of the movable seat (8) and a hydrogen injection gun (1) is provided inside the nozzle mounting bracket (9). 0), the hydrogen refueling gun (10) and the gun head mounting bracket (9) are fitted together. The upper part of the test platform (1) is provided with a fixed seat (11) and the inner side of the fixed seat (11) is provided with a hydrogen refueling port (17). The hydrogen refueling port (17) and the hydrogen refueling gun (10) correspond to each other. The surface of the hydrogen refueling gun (10) is provided with a locking groove. The upper part of the fixed seat (11) is provided with a lifting cylinder (12) and the power output end of the lifting cylinder (12) is provided with a telescopic rod (19). The lower part of the telescopic rod (19) is provided with a locking part (20) and the locking part (20) is connected to the locking groove.

2. The automatic temperature insertion and removal durability test bench for hydrogenation ports according to claim 1, characterized in that: The environmental chamber (2) includes a heating element, a cooling device and a temperature sensor.

3. The automatic temperature insertion and removal durability test bench for hydrogenation ports according to claim 1, characterized in that: The surface of the environmental chamber (2) is provided with a protective door (3) and the protective door (3) is a double door structure. The connection of the protective door (3) is provided with a latch.

4. The automatic temperature insertion and removal durability test bench for hydrogenation ports according to claim 3, characterized in that: The protective door (3) is provided with a fixed handle (4) on its surface and an observation window (5) is provided on its surface, the observation window (5) being provided with transparent tempered glass.

5. The automatic temperature insertion and removal durability test bench for hydrogenation ports according to claim 1, characterized in that: The inlet and outlet of the push cylinder (6) are equipped with control solenoid valves, and the inlet and outlet of the push cylinder (6) are connected to the drive air source.

6. The automatic temperature insertion and removal durability test bench for hydrogenation ports according to claim 1, characterized in that: The upper part of the movable seat (8) is provided with a fixed frame (13) and the inside of the fixed frame (13) is provided with a threaded rod (14). The lower part of the threaded rod (14) is provided with a fastener (15) and the fastener (15) is in contact with the hydrogen refueling gun (10). The upper end of the threaded rod (14) is provided with a connecting rod (16).

7. The automatic temperature insertion and removal durability test bench for hydrogenation ports according to claim 1, characterized in that: Limit sensors (18) are provided at the lower part of the hydrogen filling port (17) and at the corresponding position of the nozzle mounting bracket (9).

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