Hydrogen supply system

Abstract

The present invention discloses a hydrogen supply system, which includes a hydrogen supply module, a nitrogen purge module and a busbar, wherein: a pressure-reducing ventilation combination valve, a first switch valve, a second switch valve and a third switch valve are provided on the busbar, and the busbar includes a hydrogen supply main road and a plurality of hydrogen supply branches, a nitrogen supply branch and an exhaust branch; the pressure-reducing ventilation combination valve has a plurality of inlets and is correspondingly connected to the outlets of each hydrogen supply branch, and the outlet of the pressure-reducing ventilation combination valve is connected to the inlet of the hydrogen supply main road; the inlet of the first switch valve is connected to the outlet of the nitrogen supply branch, and the outlet of the first switch valve is connected to the hydrogen supply branch; the second switch valve is located on the hydrogen supply branch, the inlet of the exhaust branch is connected to the hydrogen supply branch, and the third switch valve is located on the exhaust branch; the hydrogen supply module includes a hydrogen bottle group, and the nitrogen purge module includes a nitrogen bottle group connected to the nitrogen supply branch. The hydrogen supply system of the present invention can realize functions such as automatic switching of hydrogen supply and nitrogen purge, and has complete functions and high safety.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a hydrogen supply system. Background Art

[0002] As a clean, efficient, green and environmentally friendly power source, hydrogen fuel cells are widely used in many fields such as automotive power, backup power supply, distributed power stations, etc.

[0003] Among them, the research and development of hydrogen fuel cells requires a lot of basic experimental work. The hydrogen energy laboratory is the venue guarantee for its scientific research and product inspection, and the hydrogen supply system is the core of the hydrogen energy laboratory. If the hydrogen supply system is safe, reliable, fully functional and easy to use, it can bring great safety and convenience to the testing of fuel cells.

[0004] In hydrogen energy laboratories, due to the large consumption of hydrogen, multiple hydrogen containers are generally connected through a bus to achieve centralized gas supply. However, the structure of the gas supply bus in most current hydrogen supply systems is simple and unreasonable, with low safety and certain safety hazards. In addition, the functions are not perfect and inconvenient to use. Summary of the invention

[0005] The main purpose of the present invention is to propose a hydrogen supply system, aiming to solve the problems of low safety and imperfect functions of the hydrogen supply system in the current hydrogen energy laboratory.

[0006] To achieve the above object, the present invention provides a hydrogen supply system, which includes a hydrogen supply module, a nitrogen purge module and a bus bar, wherein:

[0007] The busbar is provided with a pressure-reducing ventilation combination valve, a first switch valve, a second switch valve and a third switch valve. The busbar includes a hydrogen supply main circuit and a plurality of hydrogen supply branches, a nitrogen supply branch and an exhaust branch. The nitrogen supply branch and the exhaust branch are arranged corresponding to the hydrogen supply branch.

[0008] The decompression ventilation combination valve has a plurality of inlets and is connected to the outlets of the hydrogen supply branches respectively, and the outlet of the decompression ventilation combination valve is connected to the inlet of the hydrogen supply main road; the inlet of the first switch valve is connected to the outlet of the nitrogen supply branch, and the outlet of the first switch valve is connected to the hydrogen supply branch; the second switch valve is located on the hydrogen supply branch, the inlet of the exhaust branch is connected to the hydrogen supply branch and is located between the first switch valve and the second switch valve, and the third switch valve is located on the exhaust branch;

[0009] The hydrogen supply module includes a plurality of hydrogen cylinder groups corresponding to the hydrogen supply branch, the hydrogen cylinder groups are connected to the hydrogen supply branch and are located between the first switch valve and the second switch valve, and the nitrogen purge module includes a nitrogen cylinder group connected to the nitrogen supply branch.

[0010] Preferably, the hydrogen supply branch is provided with a first filter located between the second switch valve and the pressure-reducing ventilation combination valve, and the outlet and each inlet of the pressure-reducing ventilation combination valve are respectively provided with a first pressure gauge and a second pressure gauge.

[0011] Preferably, the busbar further includes a first branch and a second branch, and a first pneumatic valve and a second pneumatic valve are respectively provided on the first branch and the second branch, an inlet of the first branch is connected to the hydrogen supply main line, an inlet of the second branch is connected to the nitrogen supply branch, an outlet of the second branch is connected to the hydrogen supply main line, a third pneumatic valve is provided on the hydrogen supply main line, and the first branch and the second branch are sequentially located after the third pneumatic valve.

[0012] Preferably, the bus also includes a gas supply branch, the outlet of which is connected to the first pneumatic valve, the second pneumatic valve and the third pneumatic valve, and the gas supply branch is provided with a gas storage bottle, a fourth switch valve and a first pressure reducing valve in sequence.

[0013] Preferably, the device further comprises a controller for controlling the switches of the first pneumatic valve, the second pneumatic valve and the third pneumatic valve, and a detector electrically connected to the controller, wherein the detector comprises a hydrogen concentration detector and a flame detector.

[0014] Preferably, the bus also includes a hydrogen automatic pressure relief branch, the inlet of which is connected to the hydrogen supply main circuit and is located between the pressure reducing ventilation combination valve and the third pneumatic valve, and a fifth switch valve and a first pressure relief valve are sequentially provided on the hydrogen automatic pressure relief branch.

[0015] Preferably, the busbar further comprises an exhaust main path, the inlet of the exhaust main path is connected to the hydrogen automatic pressure relief branch, the first branch and the outlets of each exhaust branch, and a flame arrester is provided on the exhaust main path.

[0016] Preferably, the nitrogen supply branch is provided with a second filter, a second pressure reducing valve, a sixth switch valve, a third pressure reducing valve and a seventh switch valve in sequence, and the bus also includes a third branch, the inlet of the third branch is connected to the nitrogen supply branch and is located between the sixth switch valve and the third pressure reducing valve.

[0017] Preferably, the bus also includes a nitrogen manual pressure relief branch and a nitrogen automatic pressure relief branch, the inlets of the nitrogen manual pressure relief branch and the nitrogen automatic pressure relief branch are connected to the nitrogen supply branch and are located sequentially between the inlets of the sixth switch valve and the third branch, a needle valve is provided on the nitrogen manual pressure relief branch, and an eighth switch valve and a second pressure relief valve are provided sequentially on the nitrogen automatic pressure relief branch.

[0018] Preferably, it also includes a first pressure sensor arranged at the outlet of the hydrogen cylinder group and a second pressure sensor arranged at the outlet of the nitrogen cylinder group.

[0019] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: the hydrogen supply system is composed of a hydrogen supply module, a nitrogen purge module and a bus bar, the bus bar is provided with a plurality of hydrogen supply branches and each hydrogen supply branch is provided with a hydrogen cylinder group, the main hydrogen supply line can be switched by a pressure reducing ventilation combination valve and connected with different hydrogen supply branches to realize uninterrupted gas supply; and each hydrogen supply branch is correspondingly connected to an exhaust branch and a nitrogen supply branch, a nitrogen cylinder group is provided on the nitrogen supply branch, and the first switch valve, the second switch valve and the third switch valve can be switched in coordination to perform nitrogen purge on the hydrogen supply branch to remove air and impurities therein to avoid safety accidents; the hydrogen supply system can realize functions such as automatic switching of hydrogen supply and nitrogen purge, and has complete functions and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of an embodiment of a hydrogen supply system of the present invention;

[0021] Figure 2 for Figure 1 A schematic diagram of a portion of the structure of the hydrogen supply system;

[0022] Figure 3 for Figure 1 Another schematic diagram of the structure of the hydrogen supply system;

[0023] Figure 4 for Figure 1 A schematic diagram of another part of the structure of the hydrogen supply system. DETAILED DESCRIPTION

[0024] The scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present invention proposes a hydrogen supply system, referring to Figure 1The hydrogen supply system includes a hydrogen supply module, a nitrogen purge module and a bus 100, wherein:

[0026] The busbar 100 is provided with a pressure reducing ventilation combination valve 1, a first switch valve 2, a second switch valve 3 and a third switch valve 4. The busbar 100 includes a hydrogen supply main path 110 and a plurality of hydrogen supply branches 120, a nitrogen supply branch 130 and an exhaust branch 140. The nitrogen supply branch 130 and the exhaust branch 140 are arranged corresponding to the hydrogen supply branch 120.

[0027] The decompression ventilation combination valve 1 has a plurality of inlets and is connected to the outlets of each hydrogen supply branch 120 accordingly. The outlet of the decompression ventilation combination valve 1 is connected to the inlet of the hydrogen supply main path 110; the inlet of the first switch valve 2 is connected to the outlet of the nitrogen supply branch 130, and the outlet of the first switch valve 2 is connected to the hydrogen supply branch 120; the second switch valve 3 is located on the hydrogen supply branch 120, the inlet of the exhaust branch 140 is connected to the hydrogen supply branch 120 and is located between the first switch valve 2 and the second switch valve 3, and the third switch valve 4 is located on the exhaust branch 140;

[0028] The hydrogen supply module includes a plurality of hydrogen cylinder groups 200 arranged corresponding to the hydrogen supply branch 120 , the hydrogen cylinder groups 200 are connected to the hydrogen supply branch 120 and are located between the first switch valve 2 and the second switch valve 3 , and the nitrogen purge module includes a nitrogen cylinder group 300 connected to the nitrogen supply branch 130 .

[0029] The hydrogen supply system involved in this embodiment is applied to a hydrogen energy laboratory to deliver hydrogen to a gas supply panel, but is not limited thereto, and the hydrogen supply system can also be applied to other related hydrogen supply places. Specifically, the hydrogen supply system is composed of a hydrogen supply module, a nitrogen purge module and a bus 100, wherein:

[0030] The bus 100 is a multi-channel pipe structure, which mainly includes a main hydrogen supply path 110 and a plurality of hydrogen supply branches 120, a nitrogen supply branch 130, and an exhaust branch 140. The inlet of the main hydrogen supply path 110 is connected to the outlets of the plurality of hydrogen supply branches 120, and a pressure-reducing ventilation combination valve 1 is arranged at the connection. The pressure-reducing ventilation combination valve 1 is an automatic control valve group having the dual functions of pressure reduction and gas supply switching. By switching the pressure-reducing ventilation combination valve 1, the main hydrogen supply path 110 can be connected to one of the plurality of hydrogen supply branches 120, and the outlet of the main hydrogen supply path 110 is used for connecting hydrogen equipment (such as a gas supply panel).

[0031] Preferably, the hydrogen supply branch 120 is set to two, and each hydrogen supply branch 120 is connected to a number of hydrogen cylinder groups 200 to supply hydrogen through the hydrogen cylinder group 200. The number of hydrogen cylinder groups 200 is not specifically limited here and can be configured according to the actual gas consumption of the laboratory. The nitrogen supply branch 130 is connected to the nitrogen cylinder group 300, and the nitrogen cylinder group 300 can be connected to the entrance of the nitrogen supply branch 130, which is a single group or multiple groups. For the convenience of management, the hydrogen cylinder group 200 and the nitrogen cylinder group 300 can be in the form of a container grid. In addition, the outlet of the bottle group can be provided with a first angle valve 5, and the branch correspondingly provides a second angle valve 6, and the first angle valve 5 is connected to the second angle valve 6 through a hose 7; the second angle valve 6 can be closed, and the first angle valve 5 and the bottle mouth valve of any gas cylinder in the bottle group can be opened to check whether there is a gas leak, thereby improving safety. If there is no leak, the first angle valve 5 can be opened to achieve ventilation between the bottle group and the bus 100 branch.

[0032] The inlet of the hydrogen supply branch 120 is connected to the outlet of the nitrogen supply branch 130, and a first switch valve 2 is provided at the connection, and the switch of the first switch valve 2 can realize the connection and blocking of the hydrogen supply branch 120 and the nitrogen supply branch 130; the hydrogen supply branch 120 is provided with a second switch valve 3; the exhaust branch 140 is provided with a third switch valve 4, and the inlet of the exhaust branch 140 is connected to the hydrogen supply branch 120, and the switch of the first switch valve 2 can realize the opening and closing of the exhaust branch 140. Preferably, the first switch valve 2, the second switch valve 3 and the third switch valve 4 are all ball valves.

[0033] On the basis of the above structural design, when supplying hydrogen, one of the several hydrogen supply branches 120 is connected to the hydrogen supply main path 110, and the first switch valve 2 and the third switch valve 4 corresponding to this hydrogen supply branch 120 are in a closed state, and the second switch valve 3 is in an open state. The hydrogen in the hydrogen cylinder group 200 enters the hydrogen supply branch 120, passes through the second switch valve 3 and the pressure reduction and ventilation combination valve 1 in turn, and enters the hydrogen supply main path 110, and flows out from the outlet of the hydrogen supply main path 110 and enters the gas supply panel.

[0034] In addition, when the hydrogen supply branch 120 is purged with nitrogen to remove the remaining air and impurities therein, the first switch valve 2 and the third switch valve 4 are in an open state, and the second switch valve 3 is in a closed state. The nitrogen in the nitrogen bottle group 300 enters the nitrogen supply branch 130, first passes through the first switch valve 2 to enter the hydrogen supply branch 120, and then enters the exhaust branch 140 and passes through the third switch valve 4 before being discharged to the external environment (outdoors). It should be noted that when the hydrogen supply system is not used for a long time or is used for the first time, in order to avoid the occurrence of safety accidents, multiple nitrogen purges are required, generally more than three times. In addition, as a preferred design, refer to Figure 1 A one-way valve 8 may be provided on the exhaust branch 140 after the third switch valve 4 to prevent gas backflow or gas blowby.

[0035] In the present hydrogen supply system, the main hydrogen supply path 110 on the bus 100 can be switched through the pressure-reducing ventilation combination valve 1 and connected to different hydrogen supply branches 120 to achieve uninterrupted gas supply; and each hydrogen supply branch 120 is correspondingly connected to the exhaust branch 140 and the nitrogen supply branch 130, and the nitrogen supply branch 130 is equipped with a nitrogen bottle group 300, which can be switched through the first switch valve 2, the second switch valve 3 and the third switch valve 4 to perform nitrogen purge on the hydrogen supply branch 120 to remove air and impurities therein to avoid safety accidents; the present hydrogen supply system can realize functions such as automatic switching of hydrogen supply and nitrogen purge, and has complete functions and high safety.

[0036] In a preferred embodiment, referring to Figure 1 A first filter 9 is provided on the hydrogen supply branch 120 and is located between the second switch valve 3 and the pressure-reducing ventilation combination valve 1. A first pressure gauge 10 and a second pressure gauge 11 are provided at the outlet and each inlet of the pressure-reducing ventilation combination valve 1, respectively.

[0037] Among them, the first filter 9 is used to filter impurities contained in the gas to prevent the impurities from entering the pressure-reducing and ventilation combination valve 1, thereby causing the valve to be blocked or even damaged, thereby extending the service life of the pressure-reducing and ventilation combination valve 1; the hydrogen in the hydrogen supply branch 120 enters the hydrogen supply main path 110 after being reduced in pressure by the pressure-reducing and ventilation combination valve 1, the second pressure gauge 11 is used to display the hydrogen pressure before pressure reduction, and the first pressure gauge 10 is used to display the hydrogen pressure after pressure reduction.

[0038] In a preferred embodiment, referring to Figure 1 The bus 100 also includes a first branch 150 and a second branch 160, and the first branch 150 and the second branch 160 are respectively provided with a first pneumatic valve 12 and a second pneumatic valve 13, the inlet of the first branch 150 is connected to the hydrogen supply main path 110, the inlet of the second branch 160 is connected to the nitrogen supply branch 130, and the outlet of the second branch 160 is connected to the hydrogen supply main path 110, and the hydrogen supply main path 110 is provided with a third pneumatic valve 14, and the first branch 150 and the second branch 160 are sequentially located after the third pneumatic valve 14.

[0039] When the hydrogen supply system is supplying hydrogen normally, the first pneumatic valve 12 and the second pneumatic valve 13 are in a normally closed state, and the third pneumatic valve 14 is in a normally open state. When the hydrogen supply system detects a hydrogen leak or a fire accident, the third pneumatic valve 14 will be closed to cut off the hydrogen supply, and the first pneumatic valve 12 and the second pneumatic valve 13 will be opened, and the nitrogen in the nitrogen supply branch 130 will enter the hydrogen supply main path 110 through the second branch 160 and the second pneumatic valve 13 to purge it, and the gas in the hydrogen supply main path 110 will enter the first branch 150 and be discharged to the external environment (outdoors) after passing through the first pneumatic valve 12, so as to further improve the safety of the system.

[0040] Further, refer to Figure 1 and Figure 2 The bus 100 also includes a gas supply branch 170, the outlet of which is connected to the first pneumatic valve 12, the second pneumatic valve 13 and the third pneumatic valve 14, and the gas supply branch 170 is provided with a gas storage bottle 400, a fourth switch valve 15 and a first pressure reducing valve 16 in sequence.

[0041] The gas supply branch 170 supplies gas to the first pneumatic valve 12, the second pneumatic valve 13 and the third pneumatic valve 14 to drive them to open and close; the gas cylinder 400 is connected to the inlet of the gas supply branch 170, and the gas used can be compressed air or nitrogen. Since the gas consumption of the pneumatic valve is not large, the gas cylinder 400 can be a single cylinder or multiple cylinders in the form of a container. When the gas supply branch 170 supplies gas, the gas in the gas cylinder 400 enters the gas supply branch 170, and reaches the pneumatic valve after passing through the fourth switch valve 15 and the first pressure reducing valve 16 in sequence. Preferably, the fourth switch valve 15 is a ball valve.

[0042] Among them, pressure gauges can be respectively arranged before and after the first pressure reducing valve 16 on the gas supply branch 170 to respectively monitor the gas pressure before and after the pressure reduction of the gas supply branch 170. In addition, the bus 100 can be connected to the gas supply branch 170 to add a manual gas pressure relief branch and an automatic gas pressure relief branch, so that manual pressure relief and automatic pressure relief can be respectively achieved when the gas supply branch 170 is over-pressured, so as to improve the safety of gas supply and ensure the normal operation of the pneumatic valve. Specifically, the manual gas pressure relief branch is located between the gas storage bottle 400 and the fourth switch valve 15 and is provided with a venting needle valve, and the automatic gas pressure relief branch is located between the first pressure reducing valve 16 and the pneumatic valve and is provided with a switch valve and a pressure relief valve in sequence.

[0043] Further, refer to Figure 3 The hydrogen supply system also includes a controller 17 for controlling the switching of the first pneumatic valve 12, the second pneumatic valve 13 and the third pneumatic valve 14, and a detector 18 electrically connected to the controller 17, and the detector 18 includes a hydrogen concentration detector and a flame detector.

[0044] There can be multiple hydrogen concentration detectors and they are arranged above the bus 100, specifically at the hydrogen supply branch 120 and the hydrogen supply main 110, and can also be arranged above the laboratory gas supply panel to monitor the hydrogen concentration in real time and whether there is a hydrogen leak; the flame probe can be arranged at multiple locations in the laboratory, and the specific arrangement can be determined according to the situation, to monitor whether there is a fire. If the hydrogen concentration detector detects a hydrogen leak or the flame probe detects a fire, the controller 17 controls the opening and closing of each pneumatic valve through the gas supply branch 170, and at the same time performs the above-mentioned nitrogen purge and gas venting operations on the hydrogen supply main 110 to ensure laboratory safety.

[0045] In addition, an alarm may be provided on the controller 17 to emit an alarm sound to remind the experimental staff to deal with the safety accident urgently.

[0046] In a preferred embodiment, referring to Figure 1 The bus 100 also includes a hydrogen automatic pressure relief branch 180, the inlet of which is connected to the hydrogen supply main path 110 and is located between the pressure reduction ventilation combination valve 1 and the third pneumatic valve 14. The hydrogen automatic pressure relief branch 180 is provided with a fifth switch valve 19 and a first pressure relief valve 20 in sequence.

[0047] The hydrogen automatic pressure relief branch 180 can automatically relieve pressure when the hydrogen entering the hydrogen supply main path 110 through the pressure reducing ventilation combination valve 1 is over-pressured, thereby preventing damage to the functional components downstream of the hydrogen supply main path 110 of the bus 100 (such as the pressure reducing valve of the gas supply panel, etc.), extending its service life, and reducing cost expenditure. Specifically, the fifth switch valve 19 on the hydrogen automatic pressure relief branch 180 is in a normally open state to achieve pressure relief through the first pressure relief valve 20, and the hydrogen after pressure relief is discharged from the outlet of the hydrogen automatic pressure relief branch 180 to the external environment (outdoors). In addition, when the first pressure relief valve 20 is replaced, the fifth switch valve 19 can be closed to ensure safety. Preferably, the fifth switch valve 19 uses a ball valve.

[0048] Further, refer to Figure 1 The bus 100 also includes an exhaust main path 190 , the inlet of the exhaust main path 190 is connected to the outlets of the hydrogen automatic pressure relief branch 180 , the first branch 150 and each exhaust branch 140 , and a flame arrester 21 is provided on the exhaust main path 190 .

[0049] In this embodiment, the gases in the hydrogen automatic pressure relief branch 180, the first branch 150 and the exhaust branches 140 are uniformly exhausted through the exhaust main path 190 to optimize the structural setting of the bus 100, and the outlet of the exhaust main path 190 is led to a high place outdoors to improve the safety of the hydrogen supply system. In addition, the flame arrester 21 provided on the exhaust main path 190 can prevent backfire accidents.

[0050] In a preferred embodiment, referring to Figure 4 The nitrogen supply branch 130 is provided with a second filter 22, a second pressure reducing valve 23, a sixth switch valve 24, a third pressure reducing valve 25 and a seventh switch valve 26 in sequence. The bus 100 also includes a third branch 131, the inlet of the third branch 131 is connected to the nitrogen supply branch 130 and is located between the sixth switch valve 24 and the third pressure reducing valve 25.

[0051] Among them, the second filter 22 is used to filter impurities contained in the gas to prevent the impurities from entering the second pressure reducing valve 23, thereby causing it to be blocked or even damaged, thereby extending the service life of the second pressure reducing valve 23; the second pressure reducing valve 23 is used to reduce the high-pressure nitrogen into medium-pressure nitrogen (about 2MPa), and after the reduced pressure nitrogen passes through the sixth switch valve 24, a part enters the third branch 131 to be transported to the laboratory gas supply panel for testing, and the other part passes through the third pressure reducing valve 25 and the seventh switch valve 26 and reaches the first switch valve 2.

[0052] Alternatively, in combination with the nitrogen purge of the hydrogen supply main path 110 in the above embodiment, the other part can also reach the second pneumatic valve 13 after passing through the third pressure reducing valve 25 and the seventh switch valve 26. Preferably, the sixth switch valve 24 and the seventh switch valve 26 are ball valves.

[0053] Further, refer to Figure 4 The bus 100 also includes a nitrogen manual pressure relief branch 132 and a nitrogen automatic pressure relief branch 133. The inlets of the nitrogen manual pressure relief branch 132 and the nitrogen automatic pressure relief branch 133 are connected to the nitrogen supply branch 130 and are located between the sixth switch valve 24 and the inlet of the third branch 131 in sequence. The nitrogen manual pressure relief branch 132 is provided with a needle valve 27, and the nitrogen automatic pressure relief branch 133 is provided with an eighth switch valve 28 and a second pressure relief valve 29 in sequence.

[0054] The manual nitrogen pressure relief branch 132 and the automatic nitrogen pressure relief branch 133 can realize manual or automatic pressure relief when the hydrogen is over-pressured after being decompressed by the second pressure relief valve, so as to prevent damage to the functional components (such as the third pressure relief valve) downstream of the nitrogen supply branch 130, extend its service life, and reduce cost expenditure. Specifically, the pressure relief is realized by manually opening the needle valve 27, and the nitrogen after manual pressure relief is discharged from the outlet of the manual nitrogen pressure relief branch 132 to the external environment (outdoors); the eighth switch valve 28 on the automatic nitrogen pressure relief branch 133 is in a normally open state, so as to realize pressure relief through the second pressure relief valve 29, and the nitrogen after automatic pressure relief is discharged from the outlet of the automatic nitrogen pressure relief branch 133 to the external environment (outdoors). Moreover, when the second pressure relief valve 29 is replaced, the eighth switch valve 28 can be closed to ensure safety. Preferably, the eighth switch valve 28 uses a ball valve.

[0055] In a preferred embodiment, referring to Figure 1 and Figure 4 The busbar 100 further includes a first pressure sensor 30 disposed at the outlet of the hydrogen cylinder group 200 and a second pressure sensor 31 disposed at the outlet of the nitrogen cylinder group 300 .

[0056] The function of the first pressure sensor 30 is to monitor the gas source pressure of the hydrogen cylinder group 200 in real time, and the function of the second pressure sensor 31 is to monitor the gas source pressure of the nitrogen cylinder group 300 in real time, so that when the gas source pressure of the gas supply cylinder group is lower than the preset value, that is, when the gas storage capacity is insufficient, the gas supply cylinder group can be replaced in time to ensure the normal operation of the hydrogen supply system. In addition, when the first pressure sensor 30 detects that the gas storage capacity of the hydrogen cylinder group 200 on the hydrogen supply branch 120 connected to the hydrogen supply main road 110 is insufficient, the pressure reduction and ventilation combination valve 1 can automatically switch to connect the hydrogen supply main road 110 to another hydrogen supply branch 120 to achieve an uninterrupted supply of hydrogen.

[0057] The hydrogen supply system proposed in the above embodiments adopts modular functional design and improves the structural design of the bus 100, and is configured with multiple types of functional devices to realize functions such as automatic switching of hydrogen supply, nitrogen purging, safe gas venting, hydrogen leakage and fire detection and alarm. The hydrogen supply system has rich functions and its safety performance is greatly improved.

[0058] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A hydrogen supply system, characterized in that: It includes a hydrogen supply module, a nitrogen purge module and a bus bar, wherein: The busbar is provided with a pressure-reducing ventilation combination valve, a first switch valve, a second switch valve and a third switch valve. The busbar includes a hydrogen supply main circuit and a plurality of hydrogen supply branches, a nitrogen supply branch and an exhaust branch. The nitrogen supply branch and the exhaust branch are arranged corresponding to the hydrogen supply branch. The decompression ventilation combination valve has a plurality of inlets and is connected to the outlets of the hydrogen supply branches respectively, and the outlet of the decompression ventilation combination valve is connected to the inlet of the hydrogen supply main road; the inlet of the first switch valve is connected to the outlet of the nitrogen supply branch, and the outlet of the first switch valve is connected to the hydrogen supply branch; the second switch valve is located on the hydrogen supply branch, the inlet of the exhaust branch is connected to the hydrogen supply branch and is located between the first switch valve and the second switch valve, and the third switch valve is located on the exhaust branch; The hydrogen supply module includes a plurality of hydrogen cylinder groups corresponding to the hydrogen supply branch, the hydrogen cylinder group is connected to the hydrogen supply branch and is located between the first switch valve and the second switch valve, and the nitrogen purge module includes a nitrogen cylinder group connected to the nitrogen supply branch; The busbar also includes a first branch and a second branch, and a first pneumatic valve and a second pneumatic valve are respectively provided on the first branch and the second branch. The inlet of the first branch is connected to the hydrogen supply main road, the inlet of the second branch is connected to the nitrogen supply branch, and the outlet of the second branch is connected to the hydrogen supply main road. A third pneumatic valve is provided on the hydrogen supply main road, and the first branch and the second branch are sequentially located after the third pneumatic valve.

2. The hydrogen supply system according to claim 1, characterized in that: The hydrogen supply branch is provided with a first filter located between the second switch valve and the pressure-reducing ventilation combination valve, and the outlet and each inlet of the pressure-reducing ventilation combination valve are respectively provided with a first pressure gauge and a second pressure gauge.

3. The hydrogen supply system according to claim 1, characterized in that: The busbar also includes a gas supply branch, the outlet of which is connected to the first pneumatic valve, the second pneumatic valve and the third pneumatic valve, and a gas storage bottle, a fourth switch valve and a first pressure reducing valve are sequentially arranged on the gas supply branch.

4. The hydrogen supply system according to claim 3, characterized in that: It also includes a controller for controlling the switches of the first pneumatic valve, the second pneumatic valve and the third pneumatic valve, and a detector electrically connected to the controller, wherein the detector includes a hydrogen concentration detector and a flame detector.

5. The hydrogen supply system according to claim 1, characterized in that: The bus bar also includes a hydrogen automatic pressure relief branch, the inlet of which is connected to the hydrogen supply main circuit and is located between the pressure reducing ventilation combination valve and the third pneumatic valve, and a fifth switch valve and a first pressure relief valve are sequentially arranged on the hydrogen automatic pressure relief branch.

6. The hydrogen supply system according to claim 5, characterized in that: The busbar further comprises an exhaust main path, the inlet of which is connected to the hydrogen automatic pressure relief branch, the first branch and the outlets of each exhaust branch, and a flame arrester is arranged on the exhaust main path.

7. The hydrogen supply system according to claim 1, characterized in that: The nitrogen supply branch is provided with a second filter, a second pressure reducing valve, a sixth switch valve, a third pressure reducing valve and a seventh switch valve in sequence, and the bus also includes a third branch, the inlet of the third branch is connected to the nitrogen supply branch and is located between the sixth switch valve and the third pressure reducing valve.

8. The hydrogen supply system according to claim 7, characterized in that: The bus also includes a nitrogen manual pressure relief branch and a nitrogen automatic pressure relief branch, the inlets of the nitrogen manual pressure relief branch and the nitrogen automatic pressure relief branch are connected to the nitrogen supply branch and are located between the inlets of the sixth switch valve and the third branch in sequence, a needle valve is provided on the nitrogen manual pressure relief branch, and an eighth switch valve and a second pressure relief valve are provided on the nitrogen automatic pressure relief branch in sequence.

9. The hydrogen supply system according to claim 1, characterized in that: It also includes a first pressure sensor disposed at the outlet of the hydrogen cylinder group and a second pressure sensor disposed at the outlet of the nitrogen cylinder group.

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