Dual-nozzle dual-metering hydrogen refueling machine
By designing a dual-gun, dual-metering hydrogen refueling machine, the problems of existing hydrogen refueling machines being unable to refuel multiple vehicles simultaneously and having a single flow mode are solved, achieving flexible flow adjustment and efficient hydrogen refueling capabilities.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI HAIDELISEN HYDROGEN ENERGY TECH CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-07-31
AI Technical Summary
Existing hydrogen refueling machines use a single-meter design, which cannot refuel multiple vehicles simultaneously or achieve both regular and high-flow rates at the same time, thus limiting the refueling capacity and flexibility of hydrogen refueling stations.
Design a dual-nozzle, dual-metering hydrogen dispenser. Two hydrogen dispensing branches, Branch 1 and Branch 2, are connected in parallel. Each branch is equipped with flow regulating valves A/B and C/D, which can be opened individually or together to achieve a normal dispensing mode of ≤3.6 kg/min and a high-flow-rate dispensing mode of 7.2 kg/min. Combined with other valves such as needle valves, pneumatic ball valves, filters, and microchannel heat exchangers, dispensing efficiency and flexibility are ensured.
The hydrogen refueling machine features a dual-nozzle, dual-metering design, enabling it to refuel multiple vehicles simultaneously, adapting to the refueling needs of different vehicle models, shortening refueling time, and improving refueling efficiency and flexibility.
Smart Images
Figure CN224580125U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of hydrogen refueling equipment, and in particular to a dual-nozzle dual-metering hydrogen refueling machine. Background Technology
[0002] Against the backdrop of a global shortage of non-renewable fossil fuels and the undeniable risk of global warming, countries worldwide have reached a consensus on developing hydrogen energy. Hydrogen energy is valued for its advantages, including being green, carbon-free, pollution-free, having diverse applications, and being compatible with renewable energy sources.
[0003] The hydrogen refueling machine is the terminal refueling equipment at a hydrogen refueling station, and also the connecting device between the hydrogen refueling station and the hydrogen fuel cell vehicle.
[0004] As of 2024, the number of hydrogen refueling stations in my country had increased from 118 in 2020 to 497, and the hydrogen refueling capacity had increased from 500 kg / 12 hours to 1000 kg / 12 hours. However, technological bottlenecks in hydrogen refueling stations still constrain the industry's development, specifically manifested in the following ways: Single metering systems suffer from low efficiency, flow limitations, and insufficient integration. In related technologies, hydrogen refueling machines adopt a single-meter design. Whether it's a 35MPa or 70MPa refueling machine, one machine can only refuel one vehicle at a regular flow rate and cannot refuel multiple vehicles simultaneously. This shortcoming will become more prominent as the hydrogen refueling capacity of hydrogen refueling stations increases significantly in the future and the types of hydrogen fuel cell vehicles refueled become more diverse, hindering the actual improvement of the hydrogen refueling capacity of hydrogen refueling stations. Utility Model Content
[0005] The purpose of this invention is to provide a dual-nozzle dual-metering hydrogen refueling machine, which aims to solve the technical problems in related technologies where hydrogen refueling machines adopt a single-metering design, and one hydrogen refueling machine cannot refuel multiple vehicles at the same time, nor can it simultaneously achieve both conventional flow and high flow rates.
[0006] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of this application.
[0007] This utility model embodiment provides a dual-nozzle dual-metering hydrogen dispenser, comprising: a hydrogen dispensing branch one and a hydrogen dispensing branch two arranged in parallel, wherein both the hydrogen dispensing branch one and the hydrogen dispensing branch two include a hydrogen inlet, a flow meter, and a hydrogen dispensing nozzle arranged along the hydrogen outlet direction, characterized in that... The main pipeline of the hydrogen refueling branch is equipped with a flow regulating valve A and a flow regulating valve B connected in parallel. The flow regulating valves A and B are configured such that when at least one of them is open, it can meet the normal refueling mode with a flow rate of ≤3.6 kg / min; when both flow regulating valves A and B are open, it can meet the high-flow refueling mode with a flow rate of 7.2 kg / min. The main pipeline of the second hydrogen refueling branch is equipped with a flow regulating valve C and a flow regulating valve D connected in parallel. The flow regulating valves C and D are configured such that: when at least one of them is open, it can meet the normal refueling mode with a flow rate of ≤3.6 kg / min; when both of them are open, it can meet the high-flow refueling mode with a flow rate of 7.2 kg / min. The main valves on the hydrogen refueling branch one and the hydrogen refueling branch two are sequentially configured as follows: needle valve, pneumatic ball valve, filter, flow meter, flow regulating valve, microchannel heat exchanger, solenoid valve, breakaway valve, hydrogen refueling hose and hydrogen refueling gun.
[0008] Through the above technical solutions, the dual-nozzle dual-metering hydrogen dispenser provided by the exemplary embodiment of this application of the present utility model, by setting flow regulating valves A and B in parallel on the main pipeline of hydrogen refueling branch one, and wherein at least one of flow regulating valves A and B can meet the normal refueling mode with a flow rate of ≤3.6kg / min when opened alone; and meet the high-flow refueling mode with a flow rate of 7.2kg / min when both flow regulating valves A and B are opened together, and by setting flow regulating valves C and D in parallel on the main pipeline of hydrogen refueling branch two, wherein the flow regulating valves C and D are configured such that: the flow regulating valve C and the flow regulating valve D are connected in parallel. When at least one flow control valve D is open, it can meet the normal refueling mode with a flow rate of ≤3.6 kg / min. When both flow control valves C and D are open, they meet the high-flow refueling mode with a flow rate of 7.2 kg / min. This not only improves refueling efficiency by allowing two hydrogen refueling branches to work simultaneously in parallel, but also enables switching between the normal flow rate mode and the high-flow rate mode by setting the opening and closing of flow control valves A and B, and flow control valves C and D respectively. Furthermore, it allows for flexible flow rate adjustment to adapt to the refueling needs of different vehicle models and shorten refueling time. This solves the technical problems in related technologies where hydrogen refueling machines use a single metering design, preventing one refueling machine from simultaneously refueling multiple vehicles and simultaneously achieving both normal and high-flow rates.
[0009] In some embodiments, the flow regulating valve A, the flow regulating valve B, the flow regulating valve C, and the flow regulating valve D are all ordinary flow regulating valves capable of individually meeting the ordinary filling mode with a flow rate of ≤3.6 kg / min.
[0010] In some embodiments, both flow regulating valve A and flow regulating valve B are ordinary flow regulating valves capable of individually satisfying the normal filling mode with a flow rate of ≤3.6 kg / min; one of flow regulating valve C and flow regulating valve D is an ordinary flow regulating valve capable of satisfying the normal filling mode with a flow rate of ≤3.6 kg / min, and the other is a high-flow regulating valve capable of satisfying the high-flow filling mode with a flow rate of ≤7.2 kg / min.
[0011] In some embodiments, one of the flow regulating valves A and B is a normal flow regulating valve that meets the normal filling mode of a flow rate of ≤3.6 kg / min, and the other is a high-flow regulating valve that meets the high-flow filling mode of 7.2 kg / min; one of the flow regulating valves C and D is a normal flow regulating valve that meets the normal filling mode of a flow rate of ≤3.6 kg / min, and the other is a high-flow regulating valve that meets the high-flow filling mode of ≤7.2 kg / min.
[0012] In some embodiments, the flow regulating valve A, the flow regulating valve B, the flow regulating valve C, and the flow regulating valve D are all ordinary flow regulating valves capable of individually meeting the ordinary filling mode with a flow rate of ≤7.2 kg / min.
[0013] In some embodiments, the first hydrogen filling branch and the second hydrogen filling branch are respectively connected to a venting branch and an instrument branch. A manual venting line and an instrument line are arranged between the microchannel heat exchanger and the solenoid valve, and a main line pressure transmitter and a manual venting needle valve are provided. A filling pressure gauge, a solenoid valve, and a check valve are arranged before the solenoid valve and the disconnect valve to form a first automatic venting branch, and a pressure transmitter and a temperature transmitter are provided to form an instrument branch.
[0014] In some embodiments, the instrument piping includes an external purging branch and an internal instrument air branch. The valves of the external purging branch include a ball valve and a purging gun. The internal instrument air branch mainly includes a filter pressure regulating valve, a two-position three-way valve and a flow regulating valve, wherein the two-position three-way valve controls the closing of the pneumatic ball valve.
[0015] In some embodiments, the hydrogen filling branch one and the hydrogen filling branch two are also connected to a nitrogen purging pipeline, which is used to provide nitrogen purging and replacement for the internal piping system of the equipment, and its valves include ball valves, needle valves, and nitrogen pressure gauges.
[0016] In some embodiments, the hydrogen refueling branch one and the hydrogen refueling branch two are also connected to a safety branch, which consists of a safety valve, including a safety valve disposed between the pneumatic ball valve and the filter in the pipeline, and the safety valve is connected to the main vent pipeline of the hydrogen dispenser. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the process flow of the dual-nozzle dual-metering hydrogen refueling machine disclosed in this embodiment of the utility model.
[0019] Explanation of reference numerals in the attached figures: 1. Hydrogen filling branch one; A. Flow control valve A; B. Flow control valve B; 2. Hydrogen filling branch two; C. Flow control valve C; D. Flow control valve D; 3. Hydrogen inlet; 4. Flow meter; 5. Hydrogen filling nozzle; 6. Needle valve; 7. Pneumatic ball valve; 8. Filter; 9. Safety valve; 10. Microchannel heat exchanger; 11. Solenoid valve; 12. Breakaway valve; 13. Hydrogen filling hose; 14. Ball valve; 15. Purge nozzle; 16. Filter pressure regulating valve; 17. Two-position three-way valve; 18. Ball valve; 19. Needle valve; 20. Nitrogen pressure gauge; 21. Instrument air interface; 22. Helium purging interface; 23. Hydrogen venting interface. Detailed Implementation
[0020] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this utility model by way of example, but should not be used to limit the scope of this utility model. This utility model can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
[0021] These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values set forth in these embodiments should be interpreted as merely exemplary and not as limiting.
[0022] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "inner," "outer," etc., indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0023] Furthermore, the terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "comprising" or "including" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.
[0024] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not exist between the specific device and the first or second device.
[0025] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.
[0026] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.
[0027] like Figure 1As shown, this utility model provides a dual-nozzle dual-metering hydrogen dispenser, comprising a hydrogen dispensing branch 1 and a hydrogen dispensing branch 2 arranged in parallel. Both the hydrogen dispensing branch 1 and the hydrogen dispensing branch 2 include a hydrogen inlet 3, a flow meter 4, and a hydrogen dispensing nozzle 5 arranged along the hydrogen outlet direction. Its characteristic is that... Hydrogen refueling branch 1 has two main pipelines equipped with parallel flow control valves A and B. Flow control valves A and B are configured such that when at least one of them is open, they can meet the normal refueling mode with a flow rate ≤ 3.6 kg / min; and when both of them are open, they can meet the high-flow refueling mode with a flow rate of 7.2 kg / min. Hydrogen refueling branch 2 has two main pipelines equipped with parallel flow control valves C and D. Flow control valves C and D are configured such that when at least one of them is open, they can meet the normal refueling mode with a flow rate ≤ 3.6 kg / min; and when both of them are open, they can meet the high-flow refueling mode with a flow rate of 7.2 kg / min.
[0028] While solving the design of the hydrogen refueling branch scheme for the dual-nozzle dual-metering hydrogen dispenser, it is necessary to match other pipelines and valves to ensure the safe and efficient operation of the dual-nozzle dual-metering hydrogen dispenser. In an optional embodiment of this utility model, the main valves on hydrogen refueling branch 1 and hydrogen refueling branch 2 are sequentially configured as follows: needle valve 6, pneumatic ball valve 7, filter 8, flow meter 4, flow regulating valves (flow regulating valve A, flow regulating valve B, flow regulating valve C, flow regulating valve D), microchannel heat exchanger 10, solenoid valve 11, breakaway valve 12, hydrogen refueling hose 13, and hydrogen refueling nozzle 5. Hydrogen refueling branch 1 and hydrogen refueling branch 2 are respectively connected to the venting branch and the instrument branch. Among them, a manual venting pipeline and an instrument pipeline are arranged between the microchannel heat exchanger 10 and the solenoid valve 11, and a main pipeline pressure transmitter and a manual venting needle valve are installed. A refueling pressure gauge, a solenoid valve, and a check valve are installed before the solenoid valve 11 and the disconnect valve 12 to form a first automatic venting branch, and a pressure transmitter and a temperature transmitter are installed to form an instrument branch. The hydrogen venting interface 23 is preferably located near the hydrogen refueling gun 5 to facilitate the hydrogen venting operation during operation.
[0029] The above-described structure enables the dual-nozzle, dual-metering hydrogen refueling machine provided by this invention to switch between conventional flow rate refueling in normal refueling mode and high flow rate refueling in high flow rate mode. Furthermore, it allows for flexible flow rate adjustment to adapt to the refueling needs of different vehicle models and shorten refueling time. This solves the technical problems in related technologies where hydrogen refueling machines use a single-metering design, preventing one refueling machine from simultaneously refueling multiple vehicles and simultaneously achieving both conventional and high flow rate refueling.
[0030] In other embodiments of this utility model, flow regulating valves A, B, C, and D are all ordinary flow regulating valves capable of individually meeting the ordinary filling mode with a flow rate ≤3.6 kg / min. Preferably, the parameters and specifications of flow regulating valves A, B, C, and D are identical. When flow regulating valve A is opened alone in any hydrogen filling branch (hydrogen filling branch one or hydrogen filling branch two), the internal process flow of the hydrogen dispenser meets the conventional hydrogen dispenser filling flow rate requirement, i.e., ≤3.6 kg / min, which is the so-called ordinary filling mode. When flow regulating valve A and flow regulating valve B are opened simultaneously, the high-flow filling mode of the hydrogen dispenser is activated, with a filling flow rate ≤7.2 kg / min. The feasibility of this solution is strong, primarily because: firstly, the applicable flow control valves are relatively conventional; secondly, since the control parameters of flow control valves A, B, C, and D are all identical, the overall control logic is simple, and the number of valves opened varies in different modes; thirdly, because flow control valves A, B, C, and D are all conventional flow valves, their purchase cost is lower than that of larger flow control valves, making them more economical; and finally, due to the poor control precision during hydrogen refueling, it is difficult to meet higher refueling flow rates and refueling efficiency requirements.
[0031] Based on the above, this utility model provides another specific embodiment, which differs from the above specific embodiment in that: both flow regulating valve A and flow regulating valve B are ordinary flow regulating valves capable of individually meeting the normal filling mode of a flow rate ≤3.6kg / min; one of flow regulating valve C and flow regulating valve D is an ordinary flow regulating valve meeting the normal filling mode of a flow rate ≤3.6kg / min, and the other is a large flow regulating valve meeting the large flow filling mode of a flow rate ≤7.2kg / min. The setting of one of flow regulating valves C and D meeting the normal filling mode of a flow rate ≤3.6kg / min and the other meeting the large flow filling mode of a flow rate ≤7.2kg / min allows for more precise regulation of the internal medium flow rate in hydrogen filling branch 2, achieving higher filling flow rate and filling efficiency; the use of the large flow regulating valve will increase the upper limit of the flow rate, making the controllable range of hydrogen filling in hydrogen filling branch 2 wider. Of course, more precise control and higher flow rate limits require a more complex filling control process, and the flow control valve needs to be adjusted in real time according to pressure difference and temperature changes; therefore, high-flow control valves are very expensive. Thus, this solution is less economical than options A, B, C, and D, which all use ordinary flow control valves.
[0032] However, based on the above scheme, the configuration of flow regulating valve C and flow regulating valve D, where one is a standard flow regulating valve for a normal filling mode of ≤3.6 kg / min and the other is a high-flow regulating valve for a high-flow filling mode of ≤7.2 kg / min, allows for more precise flow regulation of the internal medium in hydrogen filling branch 2. In other optional embodiments of this utility model, one of flow regulating valve A and flow regulating valve B is a standard flow regulating valve for a normal filling mode of ≤3.6 kg / min and the other is a high-flow regulating valve for a high-flow filling mode of 7.2 kg / min; simultaneously, one of flow regulating valve C and flow regulating valve D is a standard flow regulating valve for a normal filling mode of ≤3.6 kg / min and the other is a high-flow regulating valve for a high-flow filling mode of ≤7.2 kg / min. This configuration allows both hydrogen filling branches of the dual-nozzle dual-metering hydrogen dispenser provided by this utility model to have higher flow limits and more precise operation control.
[0033] With a sufficient budget, this utility model provides a solution that is relatively less economical and more expensive, but offers high precision control of hydrogen refueling and a large flow limit. Specifically, flow regulating valves A, B, C, and D are all ordinary flow regulating valves that can individually meet the requirements of a normal refueling mode with a flow rate of ≤7.2 kg / min.
[0034] Instrument piping includes external purging branches and internal instrument gas branches, such as... Figure 1 As shown, the instrument air interface 22 connects to the valves of the external purging branch, including a ball valve 14 and a purging gun 15. The function of this purging branch is to allow manual purging of dust, fallen leaves, or other debris from the inside and outside of the hydrogen refueling unit and the hydrogen refueling nozzle, ensuring a clean and tidy operating environment. The internal instrument air branch mainly includes a filter pressure regulating valve 16, two two-position three-way valves 17, and a flow regulating valve.
[0035] Hydrogen filling branch 1 and hydrogen filling branch 2 are also connected to nitrogen purging pipelines. The nitrogen purging pipelines are used to provide nitrogen purging and purging for the internal pipeline system of the equipment to ensure the purity of hydrogen in the main hydrogen filling pipe. Its valves include a ball valve 18 connected to the helium purging interface 22, two needle valves 19, and two nitrogen pressure gauges 20.
[0036] Hydrogen refueling branch 1 and hydrogen refueling branch 2 are also connected to safety branches, which consist of safety valves, including a safety valve 9 installed between the pneumatic ball valve 7 and the filter 8 in the pipeline, and connected to the main vent pipeline of the hydrogen dispenser after the safety valve.
[0037] The aforementioned venting branch, instrument branch, and safety branch provide assurance for the safe operation of the hydrogen refueling main pipeline.
[0038] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.
[0039] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.
Claims
1. A dual gun dual metering hydrogen dispenser comprising: The hydrogen refueling branch one and hydrogen refueling branch two are arranged in parallel. Each of the two branches includes a hydrogen inlet, a flow meter, and a hydrogen refueling nozzle arranged along the hydrogen outlet direction. The characteristic feature is that... The main pipeline of the hydrogen refueling branch is equipped with a flow regulating valve A and a flow regulating valve B connected in parallel. The flow regulating valves A and B are configured such that when at least one of them is open, it can meet the normal refueling mode with a flow rate of ≤3.6 kg / min; when both flow regulating valves A and B are open, it can meet the high-flow refueling mode with a flow rate of 7.2 kg / min. The main pipeline of the second hydrogen refueling branch is equipped with a flow regulating valve C and a flow regulating valve D connected in parallel. The flow regulating valves C and D are configured such that: when at least one of them is open, it can meet the normal refueling mode with a flow rate of ≤3.6 kg / min; when both of them are open, it can meet the high-flow refueling mode with a flow rate of 7.2 kg / min. The main valves on the hydrogen refueling branch one and the hydrogen refueling branch two are sequentially configured as follows: needle valve, pneumatic ball valve, filter, flow meter, flow regulating valve, microchannel heat exchanger, solenoid valve, breakaway valve, hydrogen refueling hose and hydrogen refueling gun.
2. The dual gun dual meter hydro- dispenser of claim 1, wherein, The flow regulating valves A, B, C, and D are all ordinary flow regulating valves capable of individually meeting the ordinary filling mode with a flow rate of ≤3.6 kg / min.
3. The dual gun dual meter hydro- dispenser of claim 1, wherein, Both flow control valve A and flow control valve B are ordinary flow control valves capable of independently meeting the normal filling mode of flow rate ≤3.6kg / min; one of flow control valve C and flow control valve D is an ordinary flow control valve that meets the normal filling mode of flow rate ≤3.6kg / min, and the other is a high-flow-rate control valve that meets the high-flow-rate filling mode of flow rate ≤7.2kg / min.
4. The dual gun dual meter hydro- dispenser of claim 1, wherein, Of the flow regulating valves A and B, one is a standard flow regulating valve that meets the normal filling mode of ≤3.6kg / min, and the other is a high-flow regulating valve that meets the high-flow filling mode of ≤7.2kg / min; of the flow regulating valves C and D, one is a standard flow regulating valve that meets the normal filling mode of ≤3.6kg / min, and the other is a high-flow regulating valve that meets the high-flow filling mode of ≤7.2kg / min.
5. The dual gun dual meter hydro- dispenser of claim 1, wherein, The flow regulating valves A, B, C, and D are all ordinary flow regulating valves capable of individually meeting the ordinary filling mode with a flow rate of ≤7.2 kg / min.
6. The dual gun dual meter hydro- dispenser of claim 1, wherein, The hydrogen filling branch one and the hydrogen filling branch two are respectively connected to the venting branch and the instrument branch. A manual venting pipeline and an instrument pipeline are arranged between the microchannel heat exchanger and the solenoid valve, and a main pipeline pressure transmitter and a manual venting needle valve are installed. A filling pressure gauge, a solenoid valve, and a check valve are installed before the solenoid valve and the disconnect valve to form a first automatic venting branch, and a pressure transmitter and a temperature transmitter are installed to form an instrument branch.
7. The dual gun dual meter hydro- dispenser of claim 6, wherein, The instrument piping includes an external purging branch and an internal instrument air branch. The valves in the external purging branch include a ball valve and a purging gun. The internal instrument air branch mainly includes a filter pressure regulating valve, a two-position three-way valve, and a flow regulating valve, wherein the two-position three-way valve controls the closing of the pneumatic ball valve.
8. The dual gun dual meter hydro- dispenser of claim 7, wherein, The hydrogen filling branch one and the hydrogen filling branch two are also connected to the nitrogen purging pipeline, which is used to provide nitrogen purging and replacement for the internal pipeline system of the equipment. Its valves include ball valves, needle valves and nitrogen pressure gauges.
9. The dual gun dual meter hydro- dispenser of claim 6, wherein, The hydrogen refueling branch one and the hydrogen refueling branch two are also connected to a safety branch, which consists of a safety valve, including a safety valve installed between the pneumatic ball valve and the filter in the pipeline, and the safety valve is connected to the main vent pipeline of the hydrogen dispenser.