High-temperature monitoring and protecting device for hydrogenation gun barrel

Abstract

A monitoring branch pipe and a trigger bypass pipe are both filled with inert gas, when the hydrogenation gun barrel is in a normal-temperature state, the pressure intensity of the inert gas is kept unchanged, a second plug supports a spring, the spring supports a trigger piston, and a non-annular groove area of the trigger piston supports a valve element and enables the middle of an exhaust channel to be cut off and closed. When the hydrogenation gun barrel is in a temperature rise state, the pressure intensity of inert gas is increased, the trigger piston is pushed to move, the spring is compressed, the bearing pressure of the film pressure sensor is increased, and signals are converted by the resistance-to-voltage unit, the data acquisition unit and the signal emission unit and sent to the electric control stop valve. The electric control stop valve acts to stop and close one end of the hydrogenation gun barrel close to the hydrogenation machine, and meanwhile, when the trigger piston moves to the annular groove on the trigger piston and corresponds to the valve core, hydrogen in the hydrogenation gun barrel pushes the valve core to move into the annular groove, stop and closing in the middle of the exhaust channel are relieved, hydrogen in the hydrogenation gun barrel is exhausted from the exhaust pipe, and safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of safety protection equipment for hydrogen refueling machines, and in particular to a high-temperature monitoring and protection device for hydrogen refueling nozzles. Background Technology

[0002] Hydrogen refueling machines, similar to existing gasoline and gas refueling machines, are specialized devices used at hydrogen refueling stations to provide compressed hydrogen fuel or natural gas-hydrogen blended fuel services to hydrogen fuel cell vehicles. They also have metering and pricing functions.

[0003] Common components of a hydrogen dispenser include the hydrogen dispensing nozzle, nozzle tube, flow control valve, check valve, breakaway valve, flow meter, connecting devices, manual valve, and pressure gauge. Generally, the interior of a hydrogen dispenser and critical components such as the hydrogen dispensing nozzle are designed with high-temperature explosion-proof devices, but the nozzle tube itself lacks such a design.

[0004] When hydrogen is refueled, its volume is compressed by more than 90%. If a high temperature emergency occurs around the hydrogen refueling machine, the machine will stop supplying gas, and the refueling gun will also stop refueling. However, at this time, the hydrogen in the refueling gun tube will remain. Since the hydrogen in the refueling gun tube is compressed, the amount remaining is actually quite large, which poses a certain danger.

[0005] While existing high-temperature venting valves can be directly added to the hydrogen refueling nozzle to achieve high-temperature venting, they have several drawbacks. First, they can only be installed at specific points, limiting their coverage. For example, if a fire occurs at the end of the hydrogen refueling nozzle equipped with a high-temperature venting valve, the other end, which lacks a valve, cannot be monitored in time. Second, adding an interface increases the risk of leakage from the hydrogen refueling nozzle. Furthermore, the combination of a temperature sensor and an electrically controlled shut-off valve, like the high-temperature venting valve, also suffers from limited coverage. Summary of the Invention

[0006] The purpose of this invention is to provide a high-temperature monitoring and protection device for hydrogen refueling nozzles, addressing the limitations of existing technologies and ensuring the safety of hydrogen refueling machines.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A high-temperature monitoring and protection device for hydrogenation nozzles, comprising a monitoring branch pipe, a manifold, an exhaust bypass pipe, a trigger bypass pipe, an electrically controlled shut-off valve, an exhaust valve, and a signal monitoring module; The monitoring branch pipe consists of multiple pipes, which extend from one end of the hydrogen refueling gun pipe to the other end through a pipe support and are evenly arranged around the hydrogen refueling gun pipe. The end of the monitoring branch pipe near the hydrogen refueling gun is closed, and the end of the monitoring branch pipe near the hydrogen refueling machine is connected to the manifold. The electrically controlled shut-off valve is connected to the hydrogen refueling nozzle and is located inside the hydrogen refueling machine; The exhaust valve body is provided with an exhaust channel, a valve core channel and a valve core trigger channel; The inlet end of the exhaust channel is connected to the hydrogen refueling gun tube through an exhaust bypass pipe, and the outlet end of the exhaust channel is equipped with an exhaust pipe. One end of the valve core channel is connected to the middle of the exhaust channel, and a valve core is provided therein; the other end of the valve core channel is sealed by a first plug. The valve core trigger channel is perpendicularly connected to the valve core channel. One end of the valve core trigger channel is connected to the manifold through the trigger bypass pipe. The valve core trigger channel is equipped with a trigger piston and a spring. The trigger piston is equipped with an annular groove that matches the valve core. The other end of the valve core trigger channel is equipped with a second plug. One end face of the second plug is equipped with a positioning hole, and the other end face of the second plug is equipped with a countersunk hole. A wiring hole is connected between the positioning hole and the countersunk hole. The monitoring branch pipe and the trigger bypass pipe are filled with inert gas. The second plug supports the spring, the spring supports the trigger piston, and the non-annular groove area on the right end of the trigger piston supports the valve core and closes the middle of the exhaust channel. The signal monitoring module includes a thin-film pressure sensor, wires, and a main control board. The thin-film pressure sensor is located on the bottom surface of the positioning hole on the second plug, with a spring abutting against it. The sensor is connected to the main control board via a wire passing through a wiring hole and a countersunk hole. The main control board is used to convert the resistance change signal of the thin-film pressure sensor and wirelessly transmit it to the electrically controlled shut-off valve.

[0008] Furthermore, it also includes an end cap that is adapted to the second plug, the end cap being fastened onto the second plug, and the main control board being fixed inside the end cap.

[0009] Furthermore, a shim is provided between the thin-film pressure sensor and the spring. The shim is used to bear and balance the supporting force of the spring on the thin-film pressure sensor, so as to avoid damage to the thin-film pressure sensor.

[0010] Furthermore, the main control board is equipped with a resistance-to-voltage conversion unit, a data acquisition unit, and a signal transmission unit. The thin-film pressure sensor, the resistance-to-voltage conversion unit, the data acquisition unit, and the signal transmission unit are electrically connected in sequence, and the signal transmission unit is wirelessly connected to the electrically controlled shut-off valve.

[0011] Furthermore, the manifold has a hollow cavity structure with a through hole in the middle for the hydrogen refueling gun tube to pass through. The manifold is equipped with a manifold inlet pipe and a manifold outlet pipe that communicate with its inner cavity. The number of manifold inlet pipes and monitoring branch pipes are the same and they are connected one-to-one.

[0012] Furthermore, the manifold is also provided with a manifold gas injection pipe that communicates with its inner cavity, and a one-way valve is provided on it. The manifold gas injection pipe is used to inject inert gas into the monitoring branch pipe and the trigger bypass pipe.

[0013] Furthermore, the tube support includes a support body and several tube clamps. The support body is annular and its inner diameter is larger than the outer diameter of the hydrogenation gun tube. The tube clamps are evenly arranged on the outer annular surface of the support body.

[0014] Furthermore, the outer ring surface of the bracket body is provided with a protrusion, the protrusion is provided with a T-shaped insertion hole, the bottom surface of the pipe clamp is provided with a T-shaped pin, the pipe clamps are arranged one-to-one on the protrusion, and the T-shaped pins on the pipe clamps are inserted into the T-shaped insertion holes on the protrusion.

[0015] Furthermore, the connection point between the exhaust bypass pipe and the hydrogen refueling nozzle is located at the end of the hydrogen refueling nozzle closer to the hydrogen dispenser.

[0016] The beneficial effects of this invention are as follows: 1. A monitoring branch tube filled with inert gas is arranged around the hydrogen charging tube to monitor the temperature rise around the hydrogen charging tube, providing more comprehensive coverage. Moreover, the monitoring branch tube can bend along with the hydrogen charging tube without affecting its use. 2. The exhaust valve is designed with an exhaust channel, a valve core channel, and a valve core trigger channel. When the pressure of the inert gas in the branch pipe increases due to temperature rise, the valve core trigger component in the valve core trigger channel will be activated. The resistance of the thin-film pressure sensor in the second plug will change accordingly, and then the temperature rise signal will be sent to the electronically controlled shut-off valve to quickly cut off the gas flow. Simultaneously, the valve core trigger component in the valve core trigger channel will be activated, which will cause the valve core in the valve core channel to be activated, thereby opening the exhaust channel and allowing the hydrogen in the hydrogenation gun tube to be vented through the exhaust pipe to quickly eliminate the danger. 3. The second plug is designed with sequentially connected positioning holes, wiring holes, and countersunk holes. The positioning holes are used for spring positioning and for installing the diaphragm pressure sensor. The countersunk holes are used to assemble the second plug and the valve body of the exhaust valve. The positioning holes, wiring holes, and countersunk holes are used together for wiring, which is a clever design. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the high-temperature monitoring and protection device of the present invention; Figure 2 This is a schematic diagram of the exhaust valve of the present invention; Figure 3 This is a schematic diagram of the structure of the second plug of the present invention; Figure 4 This is a system structure diagram of the signal monitoring module of the present invention; Figure 5 This is a schematic diagram of the pipe support structure of the present invention; Figure 6 for Figure 5 Enlarged schematic diagram of region A in the middle; Figure 7 This is a schematic diagram of the combiner structure of the present invention.

[0018] Labeling instructions: 1. Hydrogenation nozzle tube; 2. Monitoring branch pipe; 3. Pipe support; 3-1. Support body; 3-1-1. Protrusion; 3-1-2. T-hole; 3-2. Pipe clamp; 3-2-1. T-pin; 4. Manifold; 4-1. Through hole; 4-2. Manifold inlet pipe; 4-3. Manifold outlet pipe; 4-4. Manifold injection pipe; 4-4-1. Check valve; 5. Trigger bypass pipe; 6. Exhaust bypass pipe; 7. Electrically controlled shut-off valve; 8. Exhaust valve; 8 -1. Exhaust passage; 8-2. Valve core passage; 8-3. Valve core trigger passage; 9. Exhaust pipe; 10. Valve core; 11. First plug; 12. Annular groove; 13. Trigger piston; 14. Spring; 15. Second plug; 15-1. Countersunk hole; 15-2. Positioning hole; 15-3. Cable routing hole; 16. Thin-film pressure sensor; 17. Gasket; 18. Main control board; 19. Resistance to voltage conversion unit; 20. Data acquisition unit; 21. End cap. Detailed Implementation

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Please see Figure 1-4 As shown, a high-temperature monitoring and protection device for hydrogen refueling nozzle includes a monitoring branch pipe 2, a manifold 4, an exhaust bypass pipe 6, a trigger bypass pipe 5, an electrically controlled shut-off valve 7, an exhaust valve 8, and a signal monitoring module.

[0021] The monitoring branch pipe 2 consists of multiple pipes, which extend from one end of the hydrogen refueling gun pipe 1 (one end of the hydrogen refueling gun pipe 1 is connected to the hydrogen refueling gun and the other end is connected to the inside of the hydrogen refueling machine) through the pipe support 3 and are evenly arranged around the hydrogen refueling gun pipe 1. The end of the monitoring branch pipe 2 near the hydrogen refueling gun is closed, and the end of the monitoring branch pipe 2 near the hydrogen refueling machine is connected to the manifold 4.

[0022] Please see Figure 5-6 As shown, the tube support 3 includes a support body 3-1 and several tube clamps 3-2. The support body 3-1 is annular and its inner diameter is larger than the outer diameter of the hydrogenation gun tube 1. The tube clamps 3-2 are evenly arranged on the outer annular surface of the support body 3-1.

[0023] According to the above structural design, the tube support 3 is installed at equal intervals on the hydrogen filling gun tube 1 through the support body 3-1. Each monitoring branch tube 2 is sequentially clamped onto the tube clamp 3-2 of each tube support 3 along the hydrogen filling gun tube 1. The tube support 3 provides support for the monitoring branch tube 2. When the hydrogen filling gun tube 1 bends, the monitoring branch tube 2 will bend accordingly.

[0024] It should be noted that, in order to ensure that the monitoring branch pipe 2 always extends from one end of the hydrogenation gun pipe 1 to the other end, the inner diameter of the main body 3-1 of the pipe support 3 should be smaller than the diameter (or minimum size) of the tail of the hydrogenation gun, so that it is kept fitted on the hydrogenation gun pipe 1, but will not fall off due to the restriction of the hydrogenation gun.

[0025] Preferably, the outer ring surface of the support body 3-1 is provided with a protrusion 3-1-1, the protrusion 3-1-1 is provided with a T-shaped insertion hole 3-1-2, the bottom surface of the pipe clamp 3-2 is provided with a T-shaped pin 3-2-1, the pipe clamps 3-2 are arranged one-to-one on the protrusion 3-1-1, and the T-shaped pins 3-2-1 provided on the pipe clamps 3-2 are inserted into the T-shaped insertion holes 3-1-2 provided on the protrusion 3-1-1.

[0026] According to the above structural design, the pipe clamp 3-2 can rotate on the support body 3-1. When the monitoring branch pipe 2 bends irregularly with the hydrogenation gun pipe 1, the pipe clamp 3-2 can rotate accordingly to avoid excessive interference between the monitoring branch pipe 2 and the pipe clamp 3-2.

[0027] It should be noted that the outer diameter of the monitoring branch pipe 2 is much smaller than that of the hydrogenation gun pipe 1.

[0028] Please see Figure 7 As shown, in the above technical solution, the manifold 4 is a hollow cavity structure, and its middle part is a through hole 4-1. The through hole 4-1 is used for the hydrogen refueling gun tube 1 to pass through. The manifold 4 is provided with a manifold inlet pipe 4-2 and a manifold outlet pipe 4-3 that are connected to its inner cavity. The number of manifold inlet pipes 4-2 and the monitoring branch pipes 2 are the same and they are connected one by one.

[0029] Optionally, the manifold 4 is also provided with a manifold gas injection pipe 4-4 that communicates with its inner cavity, and a one-way valve 4-4-1 is provided on it. The manifold gas injection pipe 4-4 is used to fill the monitoring branch pipe 2 and the trigger bypass pipe 5 with inert gas.

[0030] The electrically controlled shut-off valve 7 is connected to the hydrogen refueling nozzle 1 and is located inside the hydrogen refueling machine.

[0031] The valve body of the exhaust valve 8 is provided with an exhaust channel 8-1, a valve core channel 8-2, and a valve core trigger channel 8-3, wherein: The inlet end of the exhaust passage 8-1 is connected to the hydrogen refueling nozzle 1 via the exhaust bypass pipe 6, and the outlet end of the exhaust passage 8-1 is provided with an exhaust pipe 9. Preferably, the connection point between the exhaust bypass pipe 6 and the hydrogen refueling nozzle 1 is located at the end of the hydrogen refueling nozzle 1 closer to the hydrogen dispenser, in order to reduce the length of the pipeline arrangement; One end of the valve core channel 8-2 is connected to the middle of the exhaust channel 8-1, and a valve core 10 is provided therein; the other end of the valve core channel 8-2 is closed by the first plug 11. The valve core trigger channel 8-3 is perpendicularly connected to the valve core channel 8-2. One end of the valve core trigger channel 8-3 is connected to the manifold 4 through the trigger bypass pipe 5. The valve core trigger channel 8-3 is equipped with a trigger piston 13 and a spring 14. The trigger piston 13 is equipped with an annular groove 12 that is adapted to the valve core 10. The other end of the valve core trigger channel 8-3 is equipped with a second plug 15. One end face of the second plug 15 is equipped with a positioning hole 15-2 for positioning the spring 14. The other end face of the second plug 15 is equipped with a countersunk hole 15-1 for assembling the second plug 15 with the valve body of the exhaust valve 8. A cable routing hole 15-3 is provided between the positioning hole 15-2 and the countersunk hole 15-1.

[0032] Necessary is that both the valve core 10 and the trigger piston 13 are equipped with rubber rings to ensure the sealing of the valve core channel 8-2 and the valve core trigger channel 8-3, respectively.

[0033] The signal monitoring module includes a diaphragm pressure sensor 16, wires, and a main control board 18. The diaphragm pressure sensor 16 is located on the bottom surface of the positioning hole 15-2 on the second plug 15, with the spring 14 abutting against it. The diaphragm pressure sensor 16 is connected to the main control board 18 after passing through the wiring hole 15-3 and the countersunk hole 15-1 with wires. The main control board 18 is used to convert the resistance change signal of the diaphragm pressure sensor 16 and wirelessly transmit it to the electrically controlled shut-off valve 7.

[0034] Specifically, the main control board 18 is equipped with a resistance-to-voltage unit 19, a data acquisition unit 20, and a signal transmission unit 21. The thin-film pressure sensor 16, the resistance-to-voltage unit 19, the data acquisition unit 20, and the signal transmission unit 21 are electrically connected in sequence. The signal transmission unit 21 is wirelessly connected to the electrically controlled shut-off valve 7.

[0035] The above technical solution also includes an end cap 21 adapted to the second plug 15. The end cap 21 is fastened onto the second plug 15, and the main control board 18 is fixed inside the end cap 21. By using the end cap 21 fastened onto the second plug 15 to fix the main control board 18, an installation space is provided for the main control board 18, and the channel formed by the positioning hole 15-2, the cable routing hole 15-3, and the countersunk hole 15-1 on the second plug 15 is sealed.

[0036] Preferably, a shim 17 is provided between the thin-film pressure sensor 16 and the spring 14. The shim 17 is used to bear and balance the supporting force of the spring 14 on the thin-film pressure sensor 16, so as to avoid damage to the thin-film pressure sensor 16.

[0037] Both the monitoring branch pipe 2 and the trigger bypass pipe 5 are filled with inert gases, such as nitrogen and helium. Inert gases have a low expansion coefficient, do not easily expand with the rise in ambient temperature, and are chemically stable and non-hazardous, making them suitable for temperature rise monitoring around the hydrogen charging gun tube 1.

[0038] The hydrogenation gun barrel 1 is at room temperature (no fire occurs), the inert gas pressure remains constant, the second plug 15 supports the spring 14, the spring 14 supports the trigger piston 13, the non-annular groove area at the right end of the trigger piston 13 supports the valve core 10 and closes the middle of the exhaust passage 8-1.

[0039] When the hydrogen refueling nozzle 1 is under a temperature rise (in case of fire), the inert gas pressure increases, pushing the trigger piston 13 to move to the right. The spring 14 is compressed, increasing the pressure on the diaphragm pressure sensor 16. The signal is converted and sent to the electrically controlled shut-off valve 7 through the resistance-to-voltage unit 19, the data acquisition unit 20, and the signal transmission unit 21. The electrically controlled shut-off valve 7 closes the end of the hydrogen refueling nozzle 1 to the hydrogen dispenser. At the same time, when the trigger piston 13 moves to the position where its annular groove 12 corresponds to the valve core 10, the hydrogen in the hydrogen refueling nozzle 1 pushes the valve core 10 into the annular groove 12. The middle of the exhaust channel 8-1 is released from the shut-off, and the hydrogen in the hydrogen refueling nozzle 1 is discharged from the exhaust pipe 9, ensuring safety.

[0040] To avoid excessive inert gas pressure affecting the support of spring 14 for trigger piston 13, the inert gas should be filled at low pressure. That is, compared to the high-pressure hydrogen in hydrogen charging tube 1, the monitoring branch tube 2 and trigger bypass tube 5 contain low-pressure inert gas.

[0041] In summary, the present invention has the following advantages: 1. A monitoring branch pipe 2 filled with inert gas is arranged around the hydrogen charging gun tube 1 to monitor the temperature rise around the hydrogen charging gun tube 1, providing more comprehensive coverage. Moreover, the monitoring branch pipe 2 can bend along with the hydrogen charging gun tube 1 without affecting the use of the hydrogen charging gun tube 1. 2. An exhaust channel 8-1, a valve core channel 8-2, and a valve core trigger channel 8-3 are designed in the exhaust valve 8. When the pressure of the inert gas in the monitoring branch pipe 2 increases due to temperature rise, the valve core trigger component in the valve core trigger channel 8-3 will be activated. The resistance of the thin film pressure sensor 16 in the second plug will change accordingly, and then the temperature rise signal will be sent to the electrically controlled shut-off valve 7 to quickly cut off the gas flow. Simultaneously, the valve core trigger component in the valve core trigger channel 8-3 will be activated, which will cause the valve core 10 in the valve core channel 8-2 to be activated, thereby opening the exhaust channel 8-1 so that the hydrogen in the hydrogen refueling gun pipe 1 can be vented through the exhaust pipe 9 to quickly eliminate the danger. 3. The second plug 15 is designed with a positioning hole 15-2, a wiring hole 15-3, and a countersunk hole 15-1 connected in sequence. The positioning hole 15-2 is used for positioning the spring 14 and for installing the diaphragm pressure sensor 16. The countersunk hole 15-1 is used to assemble the valve body of the second plug 15 and the exhaust valve 8. The positioning hole 15-2, the wiring hole 15-3, and the countersunk hole 15-1 are used together for wiring, which is a clever design.

[0042] Of course, the above are only preferred embodiments of the present invention and are not intended to limit the scope of application of the present invention. Therefore, any equivalent changes made to the principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-temperature monitoring and protection device for hydrogenation nozzles, characterized in that: Monitor branch pipes, manifolds, exhaust bypass pipes, trigger bypass pipes, electrically controlled shut-off valves, exhaust valves, and signal monitoring modules; The monitoring branch pipe consists of multiple pipes, which extend from one end of the hydrogen refueling gun pipe to the other end through a pipe support and are evenly arranged around the hydrogen refueling gun pipe. The end of the monitoring branch pipe near the hydrogen refueling gun is closed, and the end of the monitoring branch pipe near the hydrogen refueling machine is connected to the manifold. The electrically controlled shut-off valve is connected to the hydrogen refueling nozzle and is located inside the hydrogen refueling machine; The exhaust valve body is provided with an exhaust channel, a valve core channel and a valve core trigger channel; The inlet end of the exhaust channel is connected to the hydrogen refueling gun tube through an exhaust bypass pipe, and the outlet end of the exhaust channel is equipped with an exhaust pipe. One end of the valve core channel is connected to the middle of the exhaust channel, and a valve core is provided therein; the other end of the valve core channel is sealed by a first plug. The valve core trigger channel is perpendicularly connected to the valve core channel. One end of the valve core trigger channel is connected to the manifold through the trigger bypass pipe. The valve core trigger channel is equipped with a trigger piston and a spring. The trigger piston is equipped with an annular groove that matches the valve core. The other end of the valve core trigger channel is equipped with a second plug. One end face of the second plug is equipped with a positioning hole, and the other end face of the second plug is equipped with a countersunk hole. A wiring hole is connected between the positioning hole and the countersunk hole. The monitoring branch pipe and the trigger bypass pipe are filled with inert gas. The second plug supports the spring, the spring supports the trigger piston, and the non-annular groove area on the right end of the trigger piston supports the valve core and closes the middle of the exhaust channel. The signal monitoring module includes a thin-film pressure sensor, wires, and a main control board. The thin-film pressure sensor is located on the bottom surface of the positioning hole on the second plug, with a spring abutting against it. The sensor is connected to the main control board via a wire passing through a wiring hole and a countersunk hole. The main control board is used to convert the resistance change signal of the thin-film pressure sensor and wirelessly transmit it to the electrically controlled shut-off valve.

2. The high-temperature monitoring and protection device for hydrogenation nozzles according to claim 1, characterized in that: It also includes an end cap that is adapted to the second plug, the end cap being fastened to the second plug, and the main control board being fixed inside the end cap.

3. A high-temperature monitoring and protection device for a hydrogenation nozzle according to claim 1 or 2, characterized in that: A shim is provided between the thin-film pressure sensor and the spring. The shim is used to bear and balance the supporting force of the spring on the thin-film pressure sensor, so as to avoid damage to the thin-film pressure sensor.

4. A high-temperature monitoring and protection device for a hydrogenation nozzle according to claim 1 or 2, characterized in that: The main control board is equipped with a resistance-to-voltage conversion unit, a data acquisition unit, and a signal transmission unit. The thin-film pressure sensor, the resistance-to-voltage conversion unit, the data acquisition unit, and the signal transmission unit are electrically connected in sequence. The signal transmission unit is wirelessly connected to the electrically controlled shut-off valve.

5. The high-temperature monitoring and protection device for hydrogenation nozzles according to claim 1, characterized in that: The manifold has a hollow cavity structure with a through hole in the middle for the hydrogen refueling gun tube to pass through. The manifold is equipped with a manifold inlet pipe and a manifold outlet pipe that communicate with its inner cavity. The number of manifold inlet pipes and monitoring branch pipes are the same and they are connected one-to-one.

6. The high-temperature monitoring and protection device for hydrogenation nozzles according to claim 5, characterized in that: The manifold is also equipped with a manifold gas injection pipe that communicates with its inner cavity, and a one-way valve is provided on it. The manifold gas injection pipe is used to inject inert gas into the monitoring branch pipe and the trigger bypass pipe.

7. The high-temperature monitoring and protection device for hydrogenation nozzles according to claim 1, characterized in that: The tube support includes a support body and several tube clamps. The support body is annular and its inner diameter is larger than the outer diameter of the hydrogenation gun tube. The tube clamps are evenly arranged on the outer annular surface of the support body.

8. The high-temperature monitoring and protection device for hydrogenation nozzles according to claim 7, characterized in that: The outer ring surface of the bracket body is provided with a protrusion, and the protrusion is provided with a T-shaped insertion hole. The bottom surface of the pipe clamp is provided with a T-shaped pin. The pipe clamps are arranged one by one on the protrusion, and the T-shaped pins on the pipe clamps are inserted into the T-shaped insertion holes on the protrusion.

9. The high-temperature monitoring and protection device for hydrogenation nozzles according to claim 1, characterized in that: The connection point between the exhaust bypass pipe and the hydrogen refueling nozzle is located at the end of the hydrogen refueling nozzle closest to the hydrogen dispenser.

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