Pressure-stabilizing hydrogen supply device for testing hydrogen fuel cell

Abstract

The utility model relates to the technical field of new energy, and provides a hydrogen fuel cell test pressure stabilization hydrogen supply device which comprises a gas storage tank, a third gas pressure detection piece, a third valve and a gas pressure adjusting pipeline, the gas storage tank is communicated with a hydrogen fuel cell through a hydrogen supply pipeline, and the third valve and the third gas pressure detection piece are both arranged on the hydrogen supply pipeline; the air pressure adjusting pipeline is communicated with the hydrogen supply pipeline between the air storage tank and the third air pressure detection piece; the air pressure adjusting pipeline is provided with a third pressure reducing valve, and pipelines at the two ends of the third pressure reducing valve are provided with a fifth air pressure detection piece and a sixth air pressure detection piece respectively. According to the utility model, the third air pressure detection piece is arranged on the pipeline between the gas storage tank and the hydrogen fuel cell, so that the air pressure of hydrogen entering the hydrogen fuel cell can be detected, the air pressure of hydrogen before entering the hydrogen fuel cell can be accurately detected without arranging an air pressure detection device on the gas storage tank, and the safety of the hydrogen fuel cell can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field especially, relate to a hydrogen fuel cell test steady voltage hydrogen supply device. BACKGROUND

[0002] Hydrogen fuel cell is a kind of based on electrolytic water reverse reaction, through anode oxidation hydrogen gas, cathode reduction oxygen, under the action of catalyst and proton exchange membrane, chemical energy is directly converted into electric energy, and product is only water, with high efficiency, zero emission characteristics, widely used in new energy vehicles, power generation detection and other fields, and its stability operation depends on accurate hydrogen pressure control and safety protection system.

[0003] In order to guarantee the reliability and safety of hydrogen fuel cell and hydrogen fuel cell engine, hydrogen fuel cell and hydrogen fuel cell engine must pass through hydrogen fuel cell test steady voltage hydrogen supply device before leaving factory.The existing hydrogen fuel cell test steady voltage hydrogen supply device is usually realized basic safety control through pressure detection device, check valve and safety valve, such as the Chinese utility model patent for authorized announcement No.CN217983417U discloses a kind of fuel cell gas supply device and testing device, wherein the fuel cell gas supply device, by setting gas storage tank, pressure detection device, check valve and safety valve, when pressure detection device detects that pressure drops to set value, hydrogen fuel cell is carried out load reduction or shutdown, and when pressure detection device detects that hydrogen pressure is too large, pressure is reduced by safety valve, to avoid the problem of hydrogen fuel cell damage caused by hydrogen suddenly breaking off.But the device only sets pressure gauge on gas storage tank, cannot know the gas pressure value at the moment when gas enters hydrogen fuel cell, when the pressure gauge on gas storage tank has problem, there is security risk.

[0004] Therefore, the utility model application provides a kind of hydrogen fuel cell test steady voltage hydrogen supply device, to solve the above problems. UTILITY MODEL CONTENT

[0005] Therefore, the utility model embodiment provides a kind of hydrogen fuel cell test steady voltage hydrogen supply device, to solve the technical problem that the existing hydrogen fuel cell test steady voltage hydrogen supply device only sets pressure gauge on gas storage tank, cannot monitor the gas pressure value at the moment when gas enters hydrogen fuel cell.

[0006] In a first aspect, the utility model discloses a hydrogen fuel cell test steady voltage hydrogen supply device, including: gas storage tank, third gas pressure detection spare, third valve and gas pressure regulating pipeline, the gas inlet of gas storage tank is connected with hydrogen source through hydrogen supply pipeline, and the gas outlet is communicated with hydrogen fuel cell through hydrogen supply pipeline, third valve and third gas pressure detection spare all set up on hydrogen supply pipeline that gas storage tank and hydrogen fuel cell communicated, and third valve is set up in the side close to hydrogen fuel cell, and third gas pressure detection spare is set up in the side close to gas storage tank, the hydrogen supply pipeline between gas pressure regulating pipeline and gas storage tank and third gas pressure detection spare is communicated, gas pressure regulating pipeline is provided with third pressure reducing valve, and the pipeline on both ends of third pressure reducing valve is provided with fifth gas pressure detection spare and sixth gas pressure detection spare respectively.

[0007] Preferably, the hydrogen supply pipeline connected with the hydrogen source of the gas storage tank is further provided with a second pressure reducing valve, and the pipeline on both ends of the second pressure reducing valve is respectively provided with a first gas pressure detection element and a second gas pressure detection element.

[0008] Preferably, the hydrogen fuel cell test steady voltage hydrogen supply device further comprises a first exhaust pipeline, a second valve is further arranged on the hydrogen supply pipeline between the second gas pressure detection element and the gas storage tank, and a first exhaust valve is arranged on the first exhaust pipeline.

[0009] Preferably, the hydrogen fuel cell test steady voltage hydrogen supply device further comprises a total valve, the total valve is arranged on the hydrogen supply pipeline close to the hydrogen source end, and a first pressure reducing valve is further arranged on the hydrogen supply pipeline between the first exhaust pipeline and the total valve.

[0010] Preferably, a first valve is further arranged on the hydrogen supply pipeline between the first exhaust pipeline and the second pressure reducing valve.

[0011] Preferably, a filter is further arranged on the hydrogen supply pipeline between the first valve and the first gas pressure detection element.

[0012] Preferably, a flow meter is further arranged on the hydrogen supply pipeline between the second valve and the gas storage tank.

[0013] Preferably, a fourth gas pressure detection element is further arranged on the gas storage tank.

[0014] Preferably, a nitrogen supply pipeline is further arranged on the hydrogen supply pipeline communicated with the third valve and the hydrogen fuel cell, a fourth valve and a seventh gas pressure detection element are arranged on the nitrogen supply pipeline, the fourth valve is arranged on the side close to the hydrogen fuel cell, and the seventh gas pressure detection element is arranged on the side close to the nitrogen source.

[0015] Preferably, a second exhaust pipeline is further arranged on the nitrogen gas supply pipeline between the seventh gas pressure detecting member and the fourth valve, and the second exhaust pipeline is provided with a second exhaust valve.

[0016] Advantages:

[0017] Compared with the prior art, the hydrogen fuel cell test stable pressure hydrogen supply device provided by the embodiment of the application comprises a gas storage tank, a third gas pressure detecting member, a third valve and a gas pressure adjusting pipeline. The gas inlet of the gas storage tank is connected with a hydrogen source through a hydrogen gas supply pipeline, and the gas outlet is communicated with a hydrogen fuel cell through a hydrogen gas supply pipeline. The third valve and the third gas pressure detecting member are arranged on the hydrogen gas supply pipeline communicated between the gas storage tank and the hydrogen fuel cell. The third valve is arranged on the side close to the hydrogen fuel cell, and the third gas pressure detecting member is arranged on the side close to the gas storage tank. The gas pressure adjusting pipeline is communicated with the hydrogen gas supply pipeline between the gas storage tank and the third gas pressure detecting member. The gas pressure adjusting pipeline is provided with a third pressure reducing valve, and the pipeline on both ends of the third pressure reducing valve is respectively provided with a fifth gas pressure detecting member and a sixth gas pressure detecting member. The technical scheme can detect the hydrogen gas pressure entering the hydrogen fuel cell by arranging the third gas pressure detecting member on the pipeline between the gas storage tank and the hydrogen fuel cell. The hydrogen gas pressure before entering the hydrogen fuel cell can be accurately detected without arranging a gas pressure detecting device on the gas storage tank. When the hydrogen gas pressure reaching the third gas pressure detecting member is too high, the hydrogen gas pressure entering the hydrogen fuel cell can be adjusted through the gas pressure adjusting pipeline, so that the hydrogen gas entering the hydrogen fuel cell is stable. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced. For those skilled in the art, other drawings can be obtained without creative labor on the premise that these drawings are within the protection scope of the present application.

[0019] Fig. 1 FIG. 1 is a structural schematic view of a hydrogen fuel cell test stable pressure hydrogen supply device in an embodiment of the present application;

[0020] Fig. 2 FIG. 2 is a structural schematic view of a hydrogen fuel cell test stable pressure hydrogen supply device in another embodiment of the present application;

[0021] Fig. 3 FIG. 3 is a structural schematic view of a hydrogen fuel cell test stable pressure hydrogen supply device in another embodiment of the present application.

[0022] Parts and components and numbers in the drawings:

[0023] 1, hydrogen supply pipeline; 10, total valve; 11, first pressure reducing valve; 12, first valve; 13, filter; 14, second pressure reducing valve; 140, first air pressure detection piece; 141, second air pressure detection piece; 15, second valve; 16, flow meter; 17, third air pressure detection piece; 18, third valve; 19, gas tank; 190, fourth air pressure detection piece; 191, safety valve; 2, first exhaust pipeline; 20, first emptying valve; 3, pressure regulating pipeline; 30, third pressure reducing valve; 31, fifth air pressure detection piece; 32, sixth air pressure detection piece; 4, nitrogen supply pipeline; 40, seventh air pressure detection piece; 41, fourth valve; 42, second exhaust pipeline; 420, second emptying valve; 421, third emptying valve; 43, first blocking valve; 44, nitrogen branch; 440, second blocking valve; 5, hydrogen source; 6, nitrogen source; 7, hydrogen fuel cell. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. It should be noted that, in this text, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or sequence between the entities or operations. In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Moreover, the terms “include”, “contain” or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement “include” do not exclude the presence of other identical elements in the process, method, article or device including the elements. If not conflicting, the embodiments of the present application and various features in the embodiments can be combined with each other, and are all within the protection scope of the present application.

[0025] Please refer to Figs. 1-3The utility model embodiment provides a kind of hydrogen fuel cell 7 test voltage stabilizing hydrogen supply device, comprising: gas holder 19, third gas pressure detection piece 17, third valve 18 and gas pressure regulating pipeline 3, the gas inlet of gas holder 19 is connected with hydrogen source 5 by hydrogen supply pipeline 1, the gas outlet is communicated with hydrogen fuel cell 7 by hydrogen supply pipeline 1, the third valve 18 and third gas pressure detection piece 17 are all arranged on the hydrogen supply pipeline 1 that gas holder 19 and hydrogen fuel cell 7 communicate, and the third valve 18 is arranged in the side close to hydrogen fuel cell 7, the third gas pressure detection piece 17 is arranged in the side close to gas holder 19;The hydrogen supply pipeline 1 between gas pressure regulating pipeline 3 and gas holder 19 and third gas pressure detection piece 17 is communicated;The gas pressure regulating pipeline 3 is provided with third pressure reducing valve 30, and fifth gas pressure detection piece 31 and sixth gas pressure detection piece 32 are respectively arranged on the pipeline of both ends of third pressure reducing valve 30.

[0026] In the embodiment, gas holder 19 is used for temporarily storing hydrogen, since gas holder 19 is connected with external hydrogen source and hydrogen fuel cell 7, when external hydrogen supply is suddenly interrupted, stable hydrogen supply to fuel cell can be realized by temporarily storing hydrogen, hydrogen pressure into hydrogen fuel cell 7 is avoided from suddenly dropping, hydrogen in gas holder 19 can maintain slow drop of hydrogen pressure, and critical buffer time is provided for hydrogen fuel cell 7.

[0027] It should be noted that, in the prior art, a gas discharge pipeline is directly arranged on the pipeline that hydrogen fuel cell 7 and gas holder 19 communicate, when pressure in gas holder 19 changes, output hydrogen pressure also changes, and the solution is to discharge unstable pressure through the gas discharge pipeline, and then recycle, so that unstable hydrogen pressure does not directly enter hydrogen fuel cell 7. Obviously, the above processing mode reduces the efficiency of hydrogen fuel cell 7. In order to solve the problem, gas pressure regulating pipeline 3 is arranged in the above embodiment, when third gas pressure detection piece 17 detects that hydrogen pressure at the position is too high, third pressure reducing valve 30 is used to adjust hydrogen pressure of the branch, so that hydrogen pressure into hydrogen fuel cell 7 meets the requirements of third gas pressure detection piece 17, and hydrogen pressure is kept stable. Fifth gas pressure detection piece 31 and sixth gas pressure detection piece 32 cooperate to detect how much pressure value is adjusted by third pressure reducing valve 30, and third gas pressure detection piece 17 can adjust pressure value to meet the requirements, so that pressure is kept stable, and all hydrogen is not discharged when pressure in gas holder 19 is too high, so that the test efficiency of hydrogen fuel cell 7 test voltage stabilizing device is ensured.

[0028] Specifically, in the above embodiment, the third air pressure detecting member 17, the fifth air pressure detecting member 31 and the sixth air pressure detecting member 32 can all be air pressure gauges; and the third valve 18 can be a diaphragm valve. It should be noted that in the present embodiment, the diaphragm valve refers to a valve that controls the on-off of fluid or pressure through the deformation of an elastic diaphragm (such as a rubber or polytetrafluoroethylene diaphragm).

[0029] In the above embodiment, by arranging the third air pressure detecting member 17 on the pipeline between the gas tank 19 and the hydrogen fuel cell 7, the hydrogen gas pressure entering the hydrogen fuel cell 7 can be detected, and the hydrogen gas pressure before entering the hydrogen fuel cell 7 can be accurately detected without arranging an air pressure detecting device on the gas tank 19, thereby improving the safety of the hydrogen fuel cell 7; and when the hydrogen gas pressure reaching the third air pressure detecting member 17 is too high, the hydrogen gas pressure entering the hydrogen fuel cell 7 can also be adjusted through the air pressure adjusting pipeline 3, so as to ensure the stability of the hydrogen gas entering the hydrogen fuel cell 7, and the hydrogen gas with too high pressure does not need to be all put into circulation, thereby improving the detection efficiency.

[0030] Please refer to Figs. 1-3 In an embodiment, the hydrogen gas supply pipeline 1 connecting the gas tank 19 and the hydrogen source 5 is further provided with a second pressure reducing valve 14, and the pipeline at both ends of the second pressure reducing valve 14 is respectively provided with a first air pressure detecting member 140 and a second air pressure detecting member 141. The gas tank 19 is provided with a safety valve 191 for exhausting gas.

[0031] In the present embodiment, the second pressure reducing valve 14 is used to reduce the high-pressure hydrogen gas input by the hydrogen source 5 to the pressure limit range of the gas tank 19, so as to avoid triggering the safety valve 191 to frequently exhaust gas or the physical damage of the gas tank 19. The first air pressure detecting member 140 and the second air pressure detecting member 141 are respectively used to detect the hydrogen gas pressure values before and after pressure reduction.

[0032] In the above embodiment, by arranging the second pressure reducing valve 14, it can be ensured that the hydrogen gas pressure value entering the gas tank 19 meets the design requirements, and the stability of the hydrogen gas pressure is ensured. Specifically, the first air pressure detecting member 140 and the second air pressure detecting member 141 can be air pressure gauges.

[0033] Please refer to Figs. 1-3 In an embodiment, the hydrogen fuel cell 7 test constant-voltage hydrogen supply device further comprises a first exhaust pipeline 2, the hydrogen gas supply pipeline 1 between the second air pressure detecting member 141 and the gas tank 19 is further provided with a second valve 15, and the first exhaust pipeline 2 is provided with a first emptying valve 20.

[0034] In the embodiment, the first exhaust pipe 2 is used for discharging hydrogen. In actual use, the first exhaust valve 20 is in a closed state, the second valve 15 is in an open state, the gas pressure of the hydrogen source 5 is reduced by the second pressure reducing valve 14 and then enters the gas storage tank 19 through the second valve 15. When the gas pressure of the hydrogen source 5 is reduced by the second pressure reducing valve 14, the gas pressure value detected by the second gas pressure detection member 141 is still too high, the second valve 15 becomes in a closed state, the first exhaust valve 20 is opened, the hydrogen cannot enter the gas storage tank 19 through the second valve 15, and can only be discharged from the first exhaust pipe 2. After the total valve 10 is closed, the hydrogen naturally flows out of the first exhaust pipe 2, and the gas pressure value can be reduced. Specifically, the second valve 15 can be a diaphragm valve, and the second gas pressure detection member 141 can be a gas pressure gauge.

[0035] Please refer to Figs. 1-3 In an embodiment, the hydrogen fuel cell 7 test constant-voltage hydrogen supply device further comprises a total valve 10 arranged on the hydrogen supply pipe 1 near one end of the hydrogen source 5; and a first pressure reducing valve 11 arranged on the hydrogen supply pipe 1 between the first exhaust pipe 2 and the total valve 10.

[0036] It should be noted that in the test process of the hydrogen fuel cell 7, the hydrogen source 5 continuously inputs, and it is generally difficult for a single pressure reducing valve to reduce the gas pressure to a preset value. Even if a single pressure reducing valve can reduce the gas pressure to a preset value, when the single pressure reducing valve fails, the test cannot continue. Therefore, in the embodiment, the first pressure reducing valve 11 is arranged on the hydrogen supply pipe 1 between the first exhaust pipe 2 and the total valve 10, and is used to cooperate with the second pressure reducing valve 14 to reduce the hydrogen gas pressure to a range that can be borne by the gas storage tank 19. When the second pressure reducing valve 14 fails, as long as the hydrogen pipe is connected, the first pressure reducing valve 11 can still complete the pressure reducing work, avoiding interruption.

[0037] Please refer to Figs. 1-3 In an embodiment, a first valve 12 is arranged on the hydrogen supply pipe 1 between the first exhaust pipe 2 and the second pressure reducing valve 14.

[0038] In the embodiment, the first valve 12 and the second valve 15 have similar functions. When the first gas pressure detection member 140 detects that the hydrogen gas pressure reduced by the first pressure reducing valve 11 does not meet the design requirements, the first valve 12 is closed, the first exhaust valve 20 is opened, the hydrogen is discharged from the first exhaust pipe 2, enters a cycle, and after the total valve 10 is closed, the hydrogen is naturally discharged from the first exhaust pipe 2, thereby ensuring that the hydrogen gas pressure is stable. Specifically, the first valve 12 can be a diaphragm valve.

[0039] Please refer to Figs. 1-3In an embodiment, a filter 13 is arranged on the hydrogen supply pipeline 1 between the first valve 12 and the first gas pressure detector 140.

[0040] It should be noted that the hydrogen fuel cell 7 includes a proton exchange membrane and a catalyst, the proton exchange membrane is a precision structure, and the thickness thereof is usually only microns, and the diameter of the catalyst particles is usually nanometers. If solid impurities are contained in the hydrogen, such as dust in the gas source, the membrane holes will be directly blocked or the surface of the catalyst will be abraded, thereby affecting the power generation efficiency. Therefore, in the embodiment, the filter 13 is arranged on the hydrogen supply pipeline 1 between the first valve 12 and the first gas pressure detector 140 to remove the solid particles, moisture and chemical impurities in the hydrogen, so as to protect the membrane electrode and the catalyst inside the hydrogen fuel cell 7 from pollution and abrasion, and prevent the impurities from damaging the precision valve in the hydrogen supply pipeline.

[0041] Referring to Figs. 1-3 In an embodiment, a flow meter 16 is arranged on the hydrogen supply pipeline 1 between the second valve 15 and the gas storage tank 19.

[0042] It should be noted that the existing hydrogen fuel cell 7 test constant-voltage hydrogen supply device usually only detects the gas pressure value of the hydrogen, and maintains the stability of the hydrogen by adjusting the gas pressure value. However, the stable pressure of the hydrogen does not mean the stable flow, for example, when the load of the hydrogen fuel cell 7 changes and more hydrogen is needed, only relying on pressure adjustment may cause the situation that the hydrogen pressure meets the standard but the flow is insufficient, for example, the flow rate of the hydrogen in the pipeline is too low. Therefore, in the embodiment, the flow meter 16 is arranged on the hydrogen supply pipeline 1 between the second valve 15 and the gas storage tank 19, so as to feed back the flow data in real time, which can make up for the limitation of relying on pressure control alone, prevent the membrane electrode from being damaged or the catalyst from being invalid due to the abnormal flow of the hydrogen, and further improve the safety and test reliability of the hydrogen fuel cell 7 test constant-voltage hydrogen supply device.

[0043] Referring to Figs. 1-3 In an embodiment, a fourth gas pressure detector 190 is arranged on the gas storage tank 19.

[0044] In the embodiment, the fourth gas pressure detector 190 can be a gas pressure gauge, which is used to monitor the gas pressure in the gas storage tank 19.

[0045] Referring to Figs. 1-3 In an embodiment, a nitrogen supply pipeline 4 is arranged on the hydrogen supply pipeline 1 connected to the hydrogen fuel cell 7, a fourth valve 41 and a seventh gas pressure detector 40 are arranged on the nitrogen supply pipeline 4, the fourth valve 41 is arranged on the side close to the hydrogen fuel cell 7, and the seventh gas pressure detector 40 is arranged on the side close to the nitrogen source 6.

[0046] In the embodiment, the nitrogen supply pipeline 4 is used for supplying nitrogen. It should be noted that if hydrogen is mixed with air, there is a risk of explosion when the hydrogen fuel cell 7 is working. Nitrogen, as an inert gas, can replace the air in the anode cavity of the hydrogen fuel cell 7, reduce the oxygen concentration to a safe range, and ensure that there is no explosion risk when hydrogen is subsequently introduced. The fourth valve 41 can be a diaphragm valve for controlling the introduction of nitrogen. The seventh gas pressure detection member 40 can be a gas pressure gauge for monitoring the gas pressure value of the nitrogen to avoid continuous input under unstable conditions.

[0047] Referring to Figs. 1-3 In an embodiment, the nitrogen supply pipeline 4 between the seventh gas pressure detection member 40 and the fourth valve 41 is further provided with a second exhaust pipeline 42, and the second exhaust pipeline 42 is provided with a second exhaust valve 420.

[0048] In the embodiment, the second exhaust pipeline 42 is used for exhausting nitrogen. It can be understood that when the nitrogen is first introduced, the fourth valve 41 is in a closed state, and the second exhaust valve 420 is in an open state. When the seventh gas pressure detection member 40 detects that the nitrogen flow is stable, the second exhaust valve 420 is closed, and the fourth valve 41 is opened, to ensure that the nitrogen introduced into the hydrogen fuel cell 7 is nitrogen in a stable gas pressure value state.

[0049] Referring to Figs. 1-3 In an embodiment, the nitrogen supply pipeline 4 is further provided with a nitrogen branch 44, an end of the nitrogen branch 44 is used for communicating with an anode outlet of the hydrogen fuel cell 7, the nitrogen supply pipeline 4 is used for communicating with an anode inlet of the hydrogen fuel cell 7, an end of the second exhaust pipeline 42 communicates with the nitrogen branch 44, the second exhaust pipeline 42 is further provided with a third exhaust valve 421, the third exhaust valve 421 is arranged close to one side of the nitrogen supply pipeline 4, the second exhaust valve 420 is arranged close to one side of the nitrogen supply pipeline 4, an exhaust outlet is arranged between the second exhaust valve 420 and the third exhaust valve 421, a first blocking valve 43 is arranged between the seventh gas pressure detection member 40 and the nitrogen branch 44, and a second blocking valve 440 is arranged at an inlet end of the nitrogen branch 44.

[0050] It should be noted that in the actual production line test process, the workpiece usually needs to be switched multiple times, for example, 10 hydrogen fuel cells 7 (which can also be hydrogen fuel cell 7 engines) need to be tested in a single day. When switching the test hydrogen fuel cell 7, the gas in the hydrogen fuel cell 7 needs to be exhausted. The existing technical solution is usually to connect nitrogen at the anode inlet of the hydrogen fuel cell 7. However, only nitrogen is introduced from the inlet, relying on the diffusion effect to replace the outlet pipeline and the dead angle of the cavity, which takes a long time. For example, in actual use of the present application, nitrogen needs to be continuously introduced from the inlet for more than 25 minutes before subsequent testing to prevent the oxygen concentration from being too high.

[0051] In order to solve the above problems, in the embodiment, the nitrogen branch 44 is connected with the outlet to realize bidirectional exhaust, and the time of nitrogen passing can be shortened. Specifically, in the embodiment, when the nitrogen passes, first, the nitrogen branch 44 is closed, that is, the second blocking valve 440 is closed, the first blocking valve 43 and the second exhaust valve 420 are opened, and the third exhaust valve 421 is closed. When the nitrogen pressure is stable, the second exhaust valve 420 is closed, the fourth valve 41 and the third exhaust valve 421 are opened, and the nitrogen passes for a preset time. Then, the second blocking valve 440 is opened, the third exhaust valve 421 is closed, the second exhaust valve 420 is opened, and the first blocking valve 43 is closed, so that the nitrogen enters from the outlet, and the reverse exhaust can reduce the risk of oxygen remaining in the anode cavity.

[0052] The hydrogen fuel cell 7 tests the gas supply process of the stable pressure hydrogen supply device as follows:

[0053] Please refer to Figs. 1-3 , when the hydrogen source 5 starts to supply gas, the first valve 12 is in a closed state, the total valve 10 and the first exhaust valve 20 are in an open state, the hydrogen passes through the first pressure reducing valve 11 and is discharged through the first exhaust pipeline 2 to discharge the air in the section through the first exhaust pipeline 2. The first pressure reducing valve 11 is also provided with a gas pressure gauge and a flow meter 16. When the gas pressure gauge and the flow meter 16 on the first pressure reducing valve 11 monitor that the pressure value and the flow are stable and meet the pressure reducing range, the first exhaust valve 20 is closed while the first valve 12 is opened. The hydrogen passes through the filter 13, the second pressure reducing valve 14, the flow meter 16 and the gas storage tank 19 in turn and reaches the third valve 18. At this time, the third valve 18 is in a closed state, the third pressure reducing valve 30 is in an open state, and the air in the pipeline is completely discharged. Finally, the third pressure reducing valve 30 is closed, and the third valve 18 is opened to supply hydrogen to the hydrogen fuel cell 7.

[0054] Please refer to Fig. 1 , the pipeline is different from the pipeline in Fig. 2 in that: before the hydrogen gas source is supplied, the second exhaust valve 420 is opened, and the fourth valve 41 is closed. When the seventh gas pressure detection piece 40 detects that the nitrogen pressure is stable, the second exhaust valve 420 is closed, the fourth valve 41 is opened, and the nitrogen is passed for a preset time. Then, in the above Fig. 1 manner, hydrogen is supplied.

[0055] Please refer to Fig. 1 , the pipeline is different from the pipeline in Fig. 3The difference between the gas supply in the first and second modes is that, after the nitrogen gas is introduced for a preset time at the inlet, the second blocking valve 440 is opened, the third evacuation valve 421 is closed, the second evacuation valve 420 is opened, the first blocking valve 43 is closed, and the nitrogen gas is introduced from the outlet, and after the reverse evacuation for a preset time, the fourth valve 41 and the nitrogen gas branch 44 are closed, and the nitrogen gas supply is cut off. Finally, in the manner described above Fig. 2 Fig. 1 with respect to the first mode, hydrogen gas is supplied.

[0056] In summary, the hydrogen fuel cell 7 test stable pressure hydrogen supply device according to the embodiments of the present application includes a gas storage tank 19, a third gas pressure detection member 17, a third valve 18, and a gas pressure regulating pipeline 3. The gas inlet of the gas storage tank 19 is connected with a hydrogen gas source 5 through a hydrogen gas supply pipeline 1, and the gas outlet is communicated with the hydrogen fuel cell 7 through the hydrogen gas supply pipeline 1. The third valve 18 and the third gas pressure detection member 17 are both arranged on the hydrogen gas supply pipeline 1 communicated between the gas storage tank 19 and the hydrogen fuel cell 7, and the third valve 18 is arranged on the side close to the hydrogen fuel cell 7, and the third gas pressure detection member 17 is arranged on the side close to the gas storage tank 19. The gas pressure regulating pipeline 3 is communicated with the hydrogen gas supply pipeline 1 between the gas storage tank 19 and the third gas pressure detection member 17. The gas pressure regulating pipeline 3 is provided with a third pressure reducing valve 30, and the pipeline at both ends of the third pressure reducing valve 30 is respectively provided with a fifth gas pressure detection member 31 and a sixth gas pressure detection member 32. The third gas pressure detection member 17 arranged on the pipeline between the gas storage tank 19 and the hydrogen fuel cell 7 can detect the hydrogen gas pressure entering the hydrogen fuel cell 7, and the gas pressure detection device is not arranged on the gas storage tank 19, but the hydrogen gas pressure before entering the hydrogen fuel cell 7 can be accurately detected, and the safety of the hydrogen fuel cell 7 can be improved. When the hydrogen gas pressure reaching the third gas pressure detection member 17 is too high, the hydrogen gas pressure entering the hydrogen fuel cell 7 can be adjusted through the gas pressure regulating pipeline 3, the hydrogen gas entering the hydrogen fuel cell 7 is stable, and the hydrogen gas with too high pressure does not need to be completely circulated, and the detection efficiency is improved.

[0057] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydrogen fuel cell testing and voltage stabilization hydrogen supply device, characterized in that, include: The system includes a gas storage tank, a third pressure detection device, a third valve, and a pressure regulating pipeline. The gas storage tank's inlet is connected to a hydrogen source via a hydrogen supply pipeline, and its outlet is connected to a hydrogen fuel cell via the same pipeline. Both the third valve and the third pressure detection device are located on the hydrogen supply pipeline connecting the gas storage tank and the hydrogen fuel cell, with the third valve positioned closer to the hydrogen fuel cell and the third pressure detection device positioned closer to the gas storage tank. The pressure regulating pipeline is connected to the hydrogen supply pipeline between the gas storage tank and the third pressure detection device. The pressure regulating pipeline is equipped with a third pressure reducing valve, and a fifth and a sixth pressure detection device are respectively installed on the pipelines at both ends of the third pressure reducing valve. A nitrogen supply pipeline is also provided on the hydrogen supply pipeline connecting the third valve and the hydrogen fuel cell, with a fourth valve and a seventh pressure detection device installed on this pipeline. The fourth valve is positioned closer to the hydrogen fuel cell, and the seventh pressure detection device is positioned closer to the nitrogen source.

2. The hydrogen fuel cell testing and voltage stabilization hydrogen supply device according to claim 1, characterized in that, A second pressure reducing valve is also installed on the hydrogen supply pipeline connecting the gas storage tank and the hydrogen source. A first pressure detection device and a second pressure detection device are respectively installed on the pipelines at both ends of the second pressure reducing valve.

3. The hydrogen fuel cell testing and voltage stabilization hydrogen supply device according to claim 2, characterized in that, It also includes a first exhaust pipe, a second valve is installed on the hydrogen supply pipe between the second pressure detection device and the gas storage tank, and a first vent valve is installed on the first exhaust pipe.

4. The hydrogen fuel cell testing and voltage stabilization hydrogen supply device according to claim 3, characterized in that, It also includes a main valve, which is located on the hydrogen supply pipeline near the hydrogen source. A first pressure reducing valve is also installed on the hydrogen supply pipeline between the first exhaust pipeline and the main valve.

5. The hydrogen fuel cell testing and voltage stabilization hydrogen supply device according to claim 4, characterized in that, A first valve is also installed on the hydrogen supply line between the first exhaust line and the second pressure reducing valve.

6. The hydrogen fuel cell testing and voltage stabilization hydrogen supply device according to claim 5, characterized in that, A filter is also installed on the hydrogen supply line between the first valve and the first pressure detection element.

7. The hydrogen fuel cell testing and voltage stabilization hydrogen supply device according to claim 6, characterized in that, A flow meter is also installed on the hydrogen supply pipeline between the second valve and the gas storage tank.

8. The hydrogen fuel cell testing and voltage stabilization hydrogen supply device according to claim 7, characterized in that, The gas storage tank is also equipped with a fourth pressure detection device.

9. The hydrogen fuel cell testing and voltage stabilization hydrogen supply device according to claim 1, characterized in that, A second exhaust pipe is also provided on the nitrogen supply pipeline between the seventh pressure detection element and the fourth valve, and a second vent valve is provided on the second exhaust pipe.

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