Full-pressure-grade hydrogen filling system

Abstract

The utility model discloses a full-pressure-grade hydrogen filling system. The technical problems that an existing filling system can only meet single-pressure-grade hydrogen filling and is poor in adaptability are mainly solved. The low-pressure filling pipeline is correspondingly communicated with a low-pressure hydrogen source, and a TK16 type hydrogenation gun and a TK25 type hydrogenation gun are arranged at the downstream terminal of the low-pressure filling pipeline in parallel; the high-pressure filling pipeline is correspondingly communicated with a high-pressure hydrogen source, and a TK17 type hydrogenation gun is arranged at the downstream terminal of the high-pressure filling pipeline in parallel; the purging pipeline is connected to the upstream corresponding positions of the low-pressure filling pipeline and the high-pressure filling pipeline; the micro-channel heat exchanger is connected to the upstream of the high-pressure filling pipeline in series, and the hydrogen sampling opening is correspondingly communicated with the low-pressure filling pipeline and the high-pressure filling pipeline. And the working air pipeline is used for providing air sources for corresponding pneumatic parts in the low-pressure filling pipeline and the high-pressure filling pipeline, is correspondingly connected to a hydrogenation gun of the high-pressure filling pipeline and is used for anti-freezing purging. According to the system, hydrogen filling of different pressure grades can be met at the same time, and various filling requirements can be met.

Description

Technical Field

[0001] This application relates to the field of energy refueling technology, specifically to a hydrogen refueling system with all pressure levels. Background Technology

[0002] Hydrogen energy produces only water as a byproduct during its use, which does not pollute the environment. Furthermore, hydrogen fuel cells have high energy conversion efficiency, which can efficiently convert the chemical energy of hydrogen into electrical energy to power vehicles. As an efficient and clean energy form, hydrogen energy is continuously being developed and promoted.

[0003] Hydrogen refueling stations, as the primary carriers of hydrogen refueling, commonly offer two refueling pressure levels: 35MPa and 70MPa, to meet the refueling needs of various vehicles and equipment. 35MPa hydrogen is typically used for buses, logistics vehicles, heavy trucks, refrigerated trucks, forklifts, and sightseeing vehicles, and the corresponding refueling nozzles are generally TK16 and TK25 models. 70MPa hydrogen is typically used for hydrogen-powered buses and passenger cars, and generally employs the TK17 refueling nozzle.

[0004] Because different vehicles have different requirements for hydrogen refueling levels and hydrogen refueling interfaces, existing hydrogen refueling stations need to be equipped with separate 35MPa hydrogen refueling systems and 70MPa hydrogen refueling systems. On the one hand, the refueling systems are independent of each other, which increases the equipment footprint and affects the investment and operational efficiency of hydrogen refueling stations. On the other hand, the separate refueling systems result in complex pipeline layout within the station, increasing construction and maintenance costs.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] In view of at least one of the above technical problems, this disclosure provides a hydrogen refueling system with all pressure levels, which mainly solves the technical problem that existing refueling systems can only meet the requirements of hydrogen refueling at a single pressure level and have poor adaptability.

[0007] According to one aspect of this disclosure, a full-pressure-level hydrogen refueling system is provided, comprising a low-pressure refueling pipeline corresponding to and connected to a low-pressure hydrogen source and having TK16 and TK25 type hydrogen refueling guns connected in parallel at its downstream end; a high-pressure refueling pipeline corresponding to and connected to a high-pressure hydrogen source and having TK17 type hydrogen refueling guns connected in parallel at its downstream end; a purging pipeline connected to corresponding upstream positions of the low-pressure and high-pressure refueling pipelines; a microchannel heat exchanger connected in series upstream of the high-pressure refueling pipeline; hydrogen sampling ports corresponding to and connected to the low-pressure and high-pressure refueling pipelines; and a working air pipeline for providing air to corresponding pneumatic components in the low-pressure and high-pressure refueling pipelines and correspondingly connected to the hydrogen refueling guns of the high-pressure refueling pipeline for antifreeze purging.

[0008] In some embodiments of this disclosure, the low-pressure filling pipeline and the high-pressure filling pipeline are respectively connected in series from upstream to downstream with a filling needle valve, a filter, a check valve, a flow meter, a flow regulating valve, a solenoid valve, a pressure transmitter, and a temperature transmitter.

[0009] In some embodiments of this disclosure, the low-pressure filling pipeline and the high-pressure filling pipeline are respectively connected to a venting pipeline via a safety valve, and the venting pipeline is also connected to the downstream of the solenoid valve of the low-pressure filling pipeline and the high-pressure filling pipeline via a venting valve.

[0010] In some embodiments of this disclosure, the vent valve includes a vent solenoid valve and a vent manual valve arranged in parallel.

[0011] In some embodiments of this disclosure, the hydrogen sampling port is connected to the pipeline between the flow meter and the flow regulating valve via a sampling needle valve.

[0012] In some embodiments of this disclosure, the working air duct includes an instrument air branch and an antifreeze purging branch arranged in parallel, and the instrument air branch is provided with an instrument air solenoid valve for controlling the on / off of the instrument air at the low-pressure filling pipeline.

[0013] In some embodiments of this disclosure, the full-pressure-level hydrogen refueling system also includes an ambient temperature transmitter for detecting ambient temperature.

[0014] In some embodiments of this disclosure, one end of the purging line is connected to a nitrogen source, and the other end is connected to the upstream of the low-pressure filling line and the high-pressure filling line through parallel branches respectively equipped with a one-way valve and a purging needle valve.

[0015] In some embodiments of this disclosure, the hydrogen refueling gun is connected to the downstream terminal of the low-pressure refueling line or the high-pressure refueling line via a breakaway valve and a hydrogen refueling hose.

[0016] One or more technical solutions provided in the embodiments of this application have at least one of the following technical effects or advantages:

[0017] 1. By integrating low-pressure and high-pressure refueling pipelines, the system enables simultaneous refueling of hydrogen at different pressure levels. Furthermore, the system is equipped with different models of hydrogen refueling nozzles to meet the hydrogen refueling needs of different types of vehicles. The equipment has a high degree of integration and is applicable to a wide range of scenarios.

[0018] 2. The working air duct not only provides the air source required for the operation of the pneumatic valves in the system, but also enables the antifreeze purging of the hydrogen refueling nozzle during high-pressure hydrogen refueling, preventing the nozzle from freezing due to the low temperature of hydrogen and thus affecting hydrogen refueling.

[0019] 3. The low-pressure filling line and the high-pressure filling line are connected to the venting line through corresponding venting valves, so that the high-pressure hydrogen in the hose can be released in time after filling, which helps to improve the service life of the hose and the safety of use.

[0020] 4. The hydrogen sampling port located downstream of the flow meter can realize the quantitative sampling of hydrogen in the corresponding filling pipeline as needed to meet the requirements of hydrogen purity detection. It can also be connected to external detection equipment to realize hydrogen sampling and component analysis. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structural principle of a hydrogen refueling system with all pressure levels in one embodiment of this application.

[0022] In the above diagrams, 1 represents the low-pressure filling line, 11 the first filling needle valve, 12 the first filter, 13 the first check valve, 14 the first flow meter, 15 the first flow regulating valve, 16 the first solenoid valve, 17 the first pressure gauge, 18 the first pressure transmitter, 19 the first temperature transmitter, 2 represents the high-pressure filling line, 21 the second filling needle valve, 22 the second filter, 23 the second check valve, 24 the second flow meter, 25 the second flow regulating valve, 26 the second solenoid valve, and 27 the second pressure gauge. 8 is the second pressure transmitter, 29 is the second temperature transmitter, 3 is the microchannel heat exchanger, 4 is the working air duct, 41 is the instrument air branch, 42 is the antifreeze purging branch, 43 is the filter pressure reducing valve, 44 is the instrument air solenoid valve, 45 is the mechanical control valve, 5 is the purging line, 61 is the first vent line, 62 is the second vent line, 63 is the first safety valve, 64 is the second safety valve, 65 is the low-pressure vent solenoid valve, 66 is the low-pressure vent manual valve, 67 is the high-pressure vent solenoid valve, 68 is the high-pressure vent manual valve, and 7 is the sampling needle valve. Detailed Implementation

[0023] The terms "first," "second," etc., used in this application are for distinguishing the described objects and have no sequential or technical meaning. Unless otherwise specified, the terms "connection" and "linkage" in this application include both direct and indirect connections (linkages).

[0024] The programs involved or relied upon in the following embodiments are all conventional or simple programs in this technical field. Those skilled in the art can make conventional choices or adaptive adjustments according to specific application scenarios.

[0025] Unless otherwise specified, all devices and other components involved in the following embodiments are commercially available products.

[0026] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] To address the issue that existing hydrogen refueling systems can only meet the refueling needs of a single pressure level, and that the construction and operation costs are high due to the need to install multiple hydrogen refueling machines to achieve refueling of various pressure levels, this example discloses a hydrogen refueling system that can simultaneously refuel hydrogen at two pressure levels: 35MPa and 70MPa. It is also equipped with multiple refueling nozzles to meet the refueling needs of different types of hydrogen-powered vehicles.

[0028] For details, see Figure 1 The full-pressure-level hydrogen refueling system disclosed in this example includes two relatively independent low-pressure refueling lines 1 and 2. The upstream of low-pressure refueling line 1 is connected to a 45MPa hydrogen source, and its downstream terminal is equipped with TK16 and TK25 type hydrogen refueling nozzles to meet the 35MPa hydrogen refueling requirements of different vehicle models. In this example, the upstream of high-pressure refueling line 2 is connected to a 90MPa hydrogen source, and its downstream terminal is equipped with a TK17 type hydrogen refueling nozzle for 70MPa hydrogen refueling. In this example, each hydrogen refueling nozzle is connected to its corresponding refueling line terminal via a disconnect valve and a hydrogen refueling hose to prevent hydrogen leakage caused by accidental start-up during vehicle refueling. After disconnection, the disconnect valve provides a bidirectional seal at both ends, preventing hydrogen leakage and protecting personnel and equipment safety.

[0029] In the low-pressure filling pipeline 1, a first filling needle valve 11, a first filter 12, a first check valve 13, a first flow meter 14, a first flow regulating valve 15, a first solenoid valve 16, a first pressure gauge 17, a first pressure transmitter 18, and a first temperature transmitter 19 are connected in series from upstream to downstream. Specifically, in this embodiment, the first filling needle valve 11 is a high-pressure needle valve with a pressure resistance of 20,000 psi, specifically a manual shut-off valve, located at the upstream end of the low-pressure filling pipeline 1, used to control the opening or closing of the low-pressure filling pipeline 1. The first filter 12 is a T-type filter with a filtration accuracy of 5. μm The maximum working pressure is 50 MPa. By filtering the hydrogen entering the pipeline, impurities in the gas are removed, ensuring the purity of the hydrogen and preventing damage to subsequent precision components such as flow meters. The first one-way valve 13 controls the flow direction of the hydrogen in the pipeline, ensuring unidirectional flow and preventing backflow. In this example, the first flow meter 14 is a Corio mass flow meter with a dual-measuring tube structure, a minimum measuring unit of 10g, and a measuring accuracy of 0.5%, enabling measurement and settlement during 35 MPa hydrogen refueling. The first flow regulating valve 15 is a pneumatic valve, using nitrogen as the driving medium in this example. Its input signal is 4–20 mA, used to regulate the hydrogen flow rate in the low-pressure refueling pipeline according to the set refueling amount, preventing flow exceeding limits. In this embodiment, a first solenoid valve 16 is connected in series downstream of the first flow regulating valve 15 to control the opening and closing of the low-pressure refueling pipeline. The first pressure gauge 17 displays the hydrogen pressure at the downstream end of the low-pressure refueling pipeline. The first pressure transmitter 18 has a range of 0–70 MPa, an accuracy of 0.25 class, and outputs a 4–20 mA signal. It is used to transmit the pressure signal at the downstream end of the low-pressure refueling pipeline to the control unit, which then performs logical processing on the hydrogen refueling status. The first temperature transmitter 19 has a range of -50–80℃, an accuracy of 0.5 class, and outputs a 4–20 mA signal. It is used to transmit the pressure signal at the downstream end of the low-pressure refueling pipeline to the control unit, which then performs logical processing on the hydrogen refueling status.

[0030] Similarly, in the high-pressure refueling pipeline 2, a second refueling needle valve 21, a second filter 22, a second check valve 23, a second flow meter 24, a second flow regulating valve 25, a second solenoid valve 26, a second pressure gauge 27, a second pressure transmitter 28, and a second temperature transmitter 29 are connected in series from upstream to downstream. The difference is that the second filter 22 is a T-type filter with a maximum working pressure of 100 MPa, used to filter the hydrogen entering the high-pressure refueling pipeline. The second flow meter 24 has a pressure resistance of 1070 MPa and is used to measure and calculate the refueling pressure of 70 MPa hydrogen. Furthermore, the second pressure gauge 27 has a range of 0–160 MPa, and the second pressure transmitter 28 has a range of 0–140 MPa.

[0031] Additionally, in this embodiment, considering that high-pressure hydrogen will cause a temperature increase during refueling, thus limiting the hydrogen refueling rate, see [reference needed]. Figure 1 A microchannel heat exchanger 3 is connected in series downstream of the second filling needle valve 21 in the high-pressure filling pipeline 2. In this example, the microchannel heat exchanger 3 is specifically a plate heat exchanger with a pre-cooling range of -40 to 0°C. Compared with ordinary shell-and-tube heat exchangers, the microchannel heat exchanger 3 has advantages such as smaller size, less heat loss, and larger heat exchange area, which can achieve sufficient cooling of high-pressure hydrogen before it enters the high-pressure filling pipeline. However, in this embodiment, the pre-cooling temperature of 70MPa hydrogen is close to -40°C, while the ambient temperature at the hydrogen refueling nozzle is relatively high (especially in summer), resulting in a temperature difference. In addition, if multiple vehicles continuously carry out refueling operations, the hydrogen temperature at the hydrogen refueling nozzle will remain at a low temperature, which can easily cause the nozzle to freeze due to the liquefaction and solidification of air, affecting normal refueling. Therefore, see [reference needed]. Figure 1 In this embodiment, a working air duct 4 is provided, which is connected to a nitrogen source. A filter pressure reducing valve 43 is connected in series upstream of the working air duct 4 to regulate and filter the intake pressure. Downstream of the working air duct 4, an instrument air branch 41 and an antifreeze purging branch 42 are connected in parallel. The instrument air branch 41 provides the working gas medium for the pneumatic valves in the low-pressure and high-pressure filling lines, while the antifreeze purging branch 42 is used to prevent freezing and de-icing at the hydrogen refueling nozzle.

[0032] See details Figure 1 In this embodiment, the instrument air branch 41 is connected to the first flow regulating valve 15 and the second flow regulating valve 25, respectively, to provide the pressurized gas required for the regulating valves to operate. An instrument air solenoid valve 44 is connected in series downstream of the connection point of the second flow regulating valve 25 in the instrument air branch 41, to control the opening or closing of the nitrogen source at the first flow regulating valve in the 35MPa low-pressure refueling pipeline. An organic control valve 45 is connected in series in the antifreeze purging branch 42 to control its opening and closing. In this embodiment, the purging port of the antifreeze purging branch is connected to the TK17 hydrogen refueling gun, purging the gun head from the inside out to prevent icing and affecting the removal of the gun upon completion of refueling; in other embodiments, the antifreeze purging branch also has a purging port at the gun holder of the hydrogen refueling gun, purging ice slag at the gun nozzle from the outside in.

[0033] In addition, see Figure 1The full-pressure-level hydrogen refueling system also includes a purge line 5. The upstream of the purge line 5 is connected to a nitrogen source, using nitrogen as the system purge gas to remove and replace residual hydrogen within the system. Specifically, the purge line 5 is connected upstream of both the low-pressure and high-pressure refueling lines via two purge branches. These branches are located downstream of the refueling needle valves of the low-pressure and high-pressure refueling lines, facilitating complete purge coverage of the entire system and preventing hydrogen residue. Furthermore, to prevent pressurized hydrogen from flowing back into the purge line 5 through the purge branches during refueling, in this embodiment, one-way valves are connected in series in each of the two purge branches to control the gas flow direction. Additionally, purge needle valves are also connected in series in each of the two purge branches to control the opening and closing of the corresponding branches.

[0034] The venting line is used to safely release hydrogen gas; see [link / reference]. Figure 1 It includes a first venting line 61 connected to the low-pressure filling line 1 via a first safety valve 63, and a second venting line 62 connected to the high-pressure filling line 2 via a second safety valve 64. The opening pressure of the first safety valve 63 is 48 MPa, and the opening pressure of the second safety valve 64 is 96 MPa, used to safely release overpressure hydrogen and ensure system safety. Furthermore, in this example, the venting lines are also connected downstream of the solenoid valves of the low-pressure and high-pressure filling lines via venting valves. See details below. Figure 1 The low-pressure filling line 1 is connected to the venting line via a low-pressure venting solenoid valve 65 and a low-pressure venting manual valve 66. The high-pressure filling line 2 is connected to the venting line via a high-pressure venting solenoid valve 67 and a high-pressure venting manual valve 68. Therefore, after hydrogen filling is complete, by closing the solenoid valves in the filling lines and correspondingly opening the low-pressure or high-pressure venting solenoid valves, the hydrogen in the downstream range of the solenoid valves in the filling lines can be safely vented. Timely venting of high-pressure hydrogen in the downstream lines after filling can prevent line fatigue and improve line lifespan and operational safety. Additionally, the venting manual valves are used during the nitrogen purging process before filling the system. During nitrogen purging, the corresponding venting manual valve is manually opened to safely vent the purged gas.

[0035] To facilitate hydrogen sampling, in this embodiment, both the low-pressure filling line 1 and the high-pressure filling line 2 are connected to hydrogen sampling ports. These sampling ports are connected downstream of the flow meters on the low-pressure or high-pressure filling lines via hydrogen sampling lines, allowing for the measurement of the sampled hydrogen volume using the flow meters. Additionally, see [link to other documentation]. Figure 1 A sampling needle valve 7 is connected in series in the hydrogen collection pipeline to control the opening and closing of the hydrogen collection pipeline, thereby realizing sampling on demand.

[0036] In addition, in this embodiment, the full-pressure-level hydrogen refueling system also includes an ambient temperature transmitter located in the surrounding environment to detect the ambient temperature. In this example, the safe temperature is set to -40 to 50°C. When the ambient temperature exceeds this safe temperature range, an alarm is triggered and the system is shut down to ensure safe operation.

[0037] When this device is in use, if hydrogen needs to be refueled for a 35MPa hydrogen fuel cell vehicle, the inlet gas source of the hydrogen refueling machine is a 45MPa hydrogen source. After manually opening the first refueling needle valve 11, selecting the refueling mode and starting the machine, the first solenoid valve 16 is energized and opens. The 45MPa hydrogen source flows sequentially through the first filter 12, the first one-way valve 13, the first flow meter 14, the first flow regulating valve 15, the first solenoid valve 16, the first pressure gauge 17, the first pressure transmitter 18, the first temperature transmitter 19, and so on. The hydrogen flow from the shut-off valve and refueling hose ultimately reaches the 35MPa refueling nozzle (TK25 or TK16). Before refueling, insert the refueling nozzle into the refueling port of the 35MPa hydrogen fuel cell vehicle to be refueled, ensuring a secure seal. Turn on the refueling nozzle switch to begin refueling at 35MPa. When the hydrogen pressure in the on-board hydrogen storage tank reaches 35MPa, the electronic control system closes the first solenoid valve 16, stopping the TK25 or TK16 refueling nozzle from refueling. The low-pressure venting solenoid valve 65 opens and then closes after a delay to complete the venting. Close the TK25 or TK16 refueling nozzle switch, unplug the refueling nozzle, and correctly place it back into the nozzle holder. This completes the 35MPa hydrogen fuel cell vehicle refueling operation. In this example, because the 35MPa main pipeline uses a single flow meter, a dual-nozzle interlock is set up, meaning that refueling cannot be performed when both nozzles are lifted simultaneously, allowing for single-nozzle refueling operations at the same time.

[0038] In addition, after the refueling system is debugged, the pressure regulating valve 43 is stable, with a pressure of 0.6-0.8 MPa and always in working condition. During the hydrogen refueling process of the 35MPa hydrogen fuel cell vehicle, the instrument air solenoid valve 44 is in the open state. After the hydrogen refueling is completed, the instrument air solenoid valve 44 is closed to prevent excess nitrogen from being consumed.

[0039] When refueling a 70MPa hydrogen fuel cell vehicle, the hydrogen refueling machine's inlet gas source is a 45 / 90MPa hydrogen source (switching according to the vehicle's cylinder pressure and storage tank pressure). After manually opening the second refueling needle valve 21, selecting the refueling mode, and starting the machine, the second solenoid valve 26 is energized and opens. The 45 / 90MPa hydrogen source flows through the microchannel heat exchanger 3, the second filter 22, the second check valve 23, the second flow meter 24, the second flow regulating valve 25, the second solenoid valve 26, the second pressure gauge 27, and the second pressure transmitter 2. 8. The second temperature transmitter 29, the disconnect valve, and the hydrogen refueling hose ultimately flow to the 70MPa hydrogen refueling nozzle (TK17). Before refueling, insert the TK17 hydrogen refueling nozzle into the 70MPa hydrogen fuel cell vehicle's refueling port, ensuring a secure connection. Open the TK17 hydrogen refueling nozzle switch to begin refueling at 70MPa. When the hydrogen pressure in the on-board hydrogen storage tank reaches 70MPa, the electronic control system controls the second solenoid valve 26 to close, stopping the TK17 hydrogen refueling nozzle from refueling. The high-pressure venting solenoid valve 67 opens and then closes after a delay to complete the venting. Remove the TK17 hydrogen refueling nozzle and correctly place it back into the nozzle holder to complete the 70MPa hydrogen fuel cell vehicle refueling operation. After refueling, if ice forms at the nozzle nozzle, open the mechanical control valve 45 and use low-pressure nitrogen to dry the nozzle before removing it.

[0040] Although some preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0041] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of its inventive concept. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A hydrogen refueling system with all pressure ratings, characterized in that, The system includes a low-pressure refueling pipeline connected to a low-pressure hydrogen source and equipped with TK16 and TK25 hydrogen refueling guns in parallel at its downstream end; a high-pressure refueling pipeline connected to a high-pressure hydrogen source and equipped with a TK17 hydrogen refueling gun in parallel at its downstream end; a purging pipeline connected to the corresponding upstream positions of the low-pressure and high-pressure refueling pipelines; a microchannel heat exchanger connected in series upstream of the high-pressure refueling pipeline; hydrogen sampling ports respectively connected to the corresponding low-pressure and high-pressure refueling pipelines; and a working air pipeline for providing air to the corresponding pneumatic components in the low-pressure and high-pressure refueling pipelines and connected to the hydrogen refueling gun of the high-pressure refueling pipeline for antifreeze purging.

2. The full-pressure-level hydrogen refueling system according to claim 1, characterized in that, The low-pressure filling pipeline and the high-pressure filling pipeline are respectively connected in series from upstream to downstream with a filling needle valve, a filter, a check valve, a flow meter, a flow regulating valve, a solenoid valve, a pressure transmitter, and a temperature transmitter.

3. The full-pressure-level hydrogen refueling system according to claim 2, characterized in that, The low-pressure filling pipeline and the high-pressure filling pipeline are respectively connected to a venting pipeline through a safety valve. The venting pipeline is also connected to the downstream of the solenoid valve of the low-pressure filling pipeline and the high-pressure filling pipeline through a venting valve.

4. The full-pressure-level hydrogen refueling system according to claim 3, characterized in that, The venting valve includes a venting solenoid valve and a venting manual valve arranged in parallel.

5. The full-pressure-level hydrogen refueling system according to claim 2, characterized in that, The hydrogen sampling port is connected to the pipeline between the flow meter and the flow regulating valve via a sampling needle valve.

6. The full-pressure-level hydrogen refueling system according to claim 2, characterized in that, The working air duct includes an instrument air branch and an antifreeze purging branch connected in parallel. The instrument air branch is equipped with an instrument air solenoid valve for controlling the on / off of the instrument air at the low-pressure filling pipeline.

7. The full-pressure-level hydrogen refueling system according to claim 1, characterized in that, It also includes an ambient temperature transmitter for detecting ambient temperature.

8. The full-pressure-level hydrogen refueling system according to claim 1, characterized in that, One end of the purging pipeline is connected to a nitrogen source, and the other end is connected to the upstream of the low-pressure filling pipeline and the high-pressure filling pipeline through parallel branches equipped with a one-way valve and a purging needle valve, respectively.

9. The full-pressure-level hydrogen refueling system according to claim 1, characterized in that, The hydrogen refueling gun is connected to the downstream terminal of the low-pressure or high-pressure refueling pipeline via a disconnect valve and a hydrogen refueling hose.

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