A gas supply system

Abstract

The present invention relates to a gas supply system. The gas supply system includes a hydrogen gas supply pipeline, which includes a primary hydrogen gas pressure reducing device, and external hydrogen gas enters the hydrogen gas supply pipeline and is reduced in pressure by the primary hydrogen gas pressure reducing device; a secondary hydrogen gas pressure reducing pipeline, which is connected to the hydrogen gas supply pipeline and reduces the pressure of the hydrogen gas provided by the hydrogen gas supply pipeline; a flow rate monitoring pipeline, which is connected to the secondary hydrogen gas pressure reducing pipeline and is used to monitor the hydrogen gas flow rate provided by the secondary hydrogen gas pressure reducing pipeline; a nitrogen gas supply pipeline, which includes a primary nitrogen gas pressure reducing device, and external nitrogen gas enters the nitrogen gas supply pipeline and is reduced in pressure by the primary nitrogen gas pressure reducing device; a helium gas supply pipeline and a secondary purge and pressure maintaining gas pressure reducing pipeline. The present invention provides a gas supply system that can effectively meet the gas supply requirements of multiple laboratories in multiple ways.

Description

Technical Field

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

[0002] With the booming development of the research and development and testing fields of fuel cell vehicles, on the one hand, there is a need for multi-laboratory uninterrupted free switching and centralized hydrogen supply; on the other hand, there is a need for multi-fuel cell system uninterrupted free switching and centralized hydrogen supply. Summary of the Invention

[0003] In view of the above problems in the prior art, the present invention provides a gas supply system that can effectively meet the gas supply requirements of multiple laboratories in various ways.

[0004] Specifically, the present invention provides a gas supply system, including,

[0005] A hydrogen gas supply pipeline, including a primary hydrogen pressure reducing device, and external hydrogen enters the hydrogen gas supply pipeline and is reduced in pressure by the primary hydrogen pressure reducing device;

[0006] A secondary hydrogen pressure reducing pipeline, connected to the hydrogen gas supply pipeline, for reducing the pressure of the hydrogen gas provided by the hydrogen gas supply pipeline;

[0007] A flow rate monitoring pipeline, connected to the secondary hydrogen pressure reducing pipeline, for monitoring the flow rate of the hydrogen gas provided by the secondary hydrogen pressure reducing pipeline;

[0008] A nitrogen gas supply pipeline, including a primary nitrogen pressure reducing device, and external nitrogen enters the nitrogen gas supply pipeline and is reduced in pressure by the primary nitrogen pressure reducing device;

[0009] A helium gas supply pipeline, including a primary helium pressure reducing device, and external helium enters the helium gas supply pipeline and is reduced in pressure by the primary helium pressure reducing device;

[0010] A purge and pressure maintaining gas secondary pressure reducing pipeline, respectively connected to the nitrogen gas supply pipeline and the helium gas supply pipeline, the output end of the purge and pressure maintaining gas secondary pressure reducing pipeline is connected to the output end of the flow rate monitoring pipeline, and the purge and pressure maintaining gas secondary pressure reducing pipeline respectively reduces the pressure of the nitrogen gas provided by the nitrogen gas supply pipeline and the helium gas provided by the helium gas supply pipeline.

[0011] According to an embodiment of the present invention, the gas supply system further includes an exhaust gas discharge pipeline, and the hydrogen gas supply pipeline, the secondary hydrogen pressure reducing pipeline, and the purge and pressure maintaining gas secondary pressure reducing pipeline are respectively connected to the exhaust gas discharge pipeline.

[0012] According to an embodiment of the present invention, the output end of the flow monitoring pipeline is connected to the fuel cell stack to be tested, and the hydrogen secondary pressure reducing pipeline, the flow monitoring pipeline, and the purge and pressure maintaining gas secondary pressure reducing pipeline form a test pipeline connected to the fuel cell stack to be tested;

[0013] The gas supply system has a plurality of such test pipelines respectively connected to different fuel cell stacks to be tested. Each test pipeline includes a hydrogen secondary pressure reducing pipeline, a flow monitoring pipeline, and a purge and pressure maintaining gas secondary pressure reducing pipeline. The hydrogen secondary pressure reducing pipeline is connected to the hydrogen gas supply pipeline, and the purge and pressure maintaining gas secondary pressure reducing pipeline is respectively connected to the nitrogen gas supply pipeline and the helium gas supply pipeline for pressure reduction.

[0014] According to an embodiment of the present invention, the gas supply system further includes a nitrogen external pipeline connected to the output end of the nitrogen gas supply pipeline. The nitrogen external pipeline reduces the pressure of the nitrogen gas provided by the nitrogen gas supply pipeline, and the output end of the nitrogen external pipeline is connected to the hydrogen gas supply pipeline.

[0015] According to an embodiment of the present invention, the primary hydrogen pressure reducing device includes two groups of pressure reducing valve sets connected in parallel on the hydrogen gas supply pipeline. Each group of pressure reducing valve sets includes a first hydrogen high-pressure ball valve, a first hydrogen high-pressure regulating valve, and a first hydrogen low-pressure pneumatic ball valve connected in series. The two groups of pressure reducing valve sets can be used separately or jointly.

[0016] According to an embodiment of the present invention, the gas supply system further includes a control host electrically connected to the electronic valves in each pipeline of the gas supply system. The control host is used to control the electronic valves in each pipeline to achieve hydrogen gas supply and purge and pressure maintaining functions.

[0017] According to an embodiment of the present invention, two pressure reducing pipelines are provided in parallel on the hydrogen secondary pressure reducing pipeline. Each pressure reducing pipeline includes a second hydrogen low-pressure pneumatic ball valve, a second hydrogen low-pressure pressure regulating valve, and a second hydrogen low-pressure ball valve connected in series, and a sixth hydrogen low-pressure ball valve connected in parallel with the second hydrogen low-pressure pneumatic ball valve. The second hydrogen low-pressure pressure regulating valves in the pressure reducing pipelines have different pressure regulating ranges.

[0018] According to an embodiment of the present invention, the flow monitoring pipeline includes a plurality of mass flow meters connected in parallel. Different mass flow meters have different measurement accuracies to meet the measurement requirements of different accuracy ranges.

[0019] According to an embodiment of the present invention, the nitrogen gas supply pipeline includes a primary nitrogen pressure reducing device, including a first nitrogen high-pressure filter, a first nitrogen high-pressure needle valve, a first nitrogen high-pressure regulating valve, and a first nitrogen low-pressure ball valve connected in series.

[0020] According to an embodiment of the present invention, the helium gas supply pipeline includes a primary helium gas pressure reducing device, which includes a first helium gas filter, a first high-pressure helium gas needle valve, a first high-pressure helium gas pressure regulating valve, and a first low-pressure helium gas ball valve connected in series.

[0021] A gas supply system provided by the present invention can effectively meet the gas supply requirements of multiple laboratories in multiple ways through the combination of a hydrogen gas supply pipeline, a secondary hydrogen gas pressure reducing pipeline, a nitrogen gas supply pipeline, a helium gas supply pipeline, and a secondary purge and pressure maintaining gas pressure reducing pipeline.

[0022] It should be understood that the above general description and the following detailed description of the present invention are both exemplary and explanatory, and are intended to provide further explanation of the present invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Including the drawings is to provide a further understanding of the present invention. They are incorporated into and constitute a part of this application. The drawings illustrate embodiments of the present invention and, together with this specification, serve to explain the principles of the present invention. In the drawings:

[0024] Figure 1 Shows a schematic structural diagram of a gas supply system according to an embodiment of the present invention.

[0025] Figure 2 Shows Figure 1 a circuit diagram of the test pipeline in

[0026] Figure 3 Shows Figure 1 a circuit diagram of the hydrogen gas supply pipeline in

[0027] Figure 4 Shows Figure 1 a circuit diagram of the secondary hydrogen gas pressure reducing pipeline in

[0028] Figure 5 Shows Figure 1 a circuit diagram of the flow monitoring pipeline in

[0029] Figure 6 Shows Figure 1 a circuit diagram of the nitrogen gas supply pipeline in

[0030] Figure 7 Shows Figure 1 a circuit diagram of the helium gas supply pipeline in

[0031] Figure 8 Shows Figure 1 a circuit diagram of the secondary purge and pressure maintaining gas pressure reducing pipeline in

[0032] Figure 9 Shows Figure 1 a circuit diagram of the external nitrogen gas pipeline in

[0033] Among them, the above-mentioned drawings include the following reference numerals:

[0034] Gas supply system 100

[0035] Hydrogen supply pipeline 101

[0036] Second-stage hydrogen pressure reduction pipeline 102

[0037] Flow monitoring pipeline 103

[0038] Nitrogen supply pipeline 104

[0039] Helium supply pipeline 105, purge and pressure-maintaining gas second-stage pressure reduction pipeline 106, first-stage hydrogen pressure reduction device 107

[0040] First-stage nitrogen pressure reduction device 108

[0041] First-stage helium pressure reduction device 109

[0042] Exhaust gas discharge pipeline 110

[0043] Stack to be tested 111

[0044] Test pipeline 112

[0045] Nitrogen external connection pipeline 113

[0046] First hydrogen high-pressure ball valve 114

[0047] First hydrogen high-pressure regulating valve 115

[0048] First hydrogen low-pressure pneumatic ball valve 116, gas sampling and detection port 117

[0049] Third hydrogen low-pressure ball valve 118

[0050] First hydrogen low-pressure needle valve 119

[0051] Fourth hydrogen low-pressure ball valve 120

[0052] First hydrogen unloading valve 121

[0053] Second hydrogen low-pressure needle valve 122

[0054] Fifth hydrogen low-pressure ball valve 123

[0055] Fourth hydrogen low-pressure pneumatic ball valve 124, second hydrogen low-pressure pneumatic ball valve 125, second hydrogen low-pressure pressure regulating valve 126

[0056] Second hydrogen low-pressure ball valve 127

[0057] Sixth hydrogen low-pressure ball valve 128

[0058] The seventh hydrogen low-pressure ball valve 129, the first hydrogen low-pressure unloading valve 130, the hydrogen pressure gauge 131, the hydrogen temperature sensor 132, the hydrogen pressure sensor 133, the mass flowmeter 134

[0059] The first nitrogen high-pressure filter 135, the first nitrogen high-pressure needle valve 136, the first nitrogen high-pressure pressure regulating valve 137, the first nitrogen low-pressure ball valve 138, the nitrogen cylinder connector 139

[0060] The first helium filter 140, the first helium high-pressure needle valve 141, the first helium high-pressure pressure regulating valve 142, the first helium low-pressure ball valve 143, the helium cylinder connector 144, the nitrogen purge pipeline 145, the helium pressure holding pipeline 146

[0061] The first nitrogen low-pressure pressure regulating valve 147

[0062] The first nitrogen pneumatic ball valve 148

[0063] The second nitrogen low-pressure ball valve 149, the first nitrogen low-pressure check valve 150

[0064] The third nitrogen low-pressure ball valve 151, the nitrogen pressure gauge 152, the nitrogen pressure sensor 153, the first helium low-pressure pressure regulating valve 154

[0065] The first helium pneumatic ball valve 155

[0066] The second helium low-pressure ball valve 156, the first helium check valve 157

[0067] The third helium low-pressure ball valve 158

[0068] The helium pressure gauge 159

[0069] The helium pressure sensor 160 Detailed implementation manners

[0070] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0071] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0072] It should be noted that the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the exemplary embodiments of the present application. As used herein, unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0073] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual scale. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorized specification. In all examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0074] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, top, bottom, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0075] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure for the device. For example, if the device in the attached drawing is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0076] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus cannot be construed as limitations on the protection scope of this application. Moreover, although the terms used in this application are selected from well-known and commonly used terms, some of the terms mentioned in the specification of this application may be selected by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant parts of the description herein. In addition, it is required to understand this application not only through the actual terms used, but also through the meanings implied by each term.

[0077] Figure 1 The structural schematic diagram of a gas supply system according to an embodiment of the present invention is shown. As shown in the figure, a gas supply system 100 mainly includes a hydrogen supply pipeline 101, a hydrogen secondary pressure reduction pipeline 102, a flow rate monitoring pipeline 103, a nitrogen supply pipeline 104, a helium supply pipeline 105, and a purge and pressure maintaining gas secondary pressure reduction pipeline 106.

[0078] Among them, the hydrogen supply pipeline 101 includes a primary hydrogen pressure reduction device 107. External hydrogen enters the hydrogen supply pipeline 101 and is reduced in pressure by the primary hydrogen pressure reduction device 107.

[0079] The hydrogen secondary pressure reduction pipeline 102 is connected to the hydrogen supply pipeline 101. The hydrogen secondary pressure reduction pipeline 102 reduces the pressure of the hydrogen provided by the hydrogen supply pipeline 101.

[0080] The flow rate monitoring pipeline 103 is connected to the hydrogen secondary pressure reduction pipeline 102. The flow rate monitoring pipeline 103 is used to monitor the hydrogen flow rate provided by the hydrogen secondary pressure reduction pipeline 102.

[0081] The nitrogen gas supply pipeline 104 includes a primary nitrogen gas pressure reducing device 108. External nitrogen gas enters the nitrogen gas supply pipeline 104 and is reduced in pressure by the primary nitrogen gas pressure reducing device 108.

[0082] The helium gas supply pipeline 105 includes a primary helium gas pressure reducing device 109. External helium gas enters the helium gas supply pipeline 105 and is reduced in pressure by the primary helium gas pressure reducing device 109.

[0083] The purge and pressure maintaining gas secondary pressure reducing pipeline 106 is respectively connected to the nitrogen gas supply pipeline 104 and the helium gas supply pipeline 105. The output end of the purge and pressure maintaining gas secondary pressure reducing pipeline 106 is connected to the output end of the flow rate monitoring pipeline 103. The purge and pressure maintaining gas secondary pressure reducing pipeline 106 reduces the pressure of the nitrogen gas provided by the nitrogen gas supply pipeline 104 and the helium gas provided by the helium gas supply pipeline 105 respectively.

[0084] Preferably, the gas supply system 100 further includes an exhaust gas discharge pipeline 110. The hydrogen gas supply pipeline 101, the hydrogen gas secondary pressure reducing pipeline 102 and the purge and pressure maintaining gas secondary pressure reducing pipeline 106 are respectively connected to the exhaust gas discharge pipeline 110. As needed, the gases in the hydrogen gas supply pipeline 101, the hydrogen gas secondary pressure reducing pipeline 102 and the purge and pressure maintaining gas secondary pressure reducing pipeline 106 can be discharged to the outside of the gas supply system 100 through the exhaust gas discharge pipeline 110.

[0085] Figure 2 shows Figure 1 the circuit diagram of the test pipeline in. As shown in the figure, preferably, the output end of the flow rate monitoring pipeline 103 is connected to the fuel cell stack 111 to be tested. The hydrogen gas secondary pressure reducing pipeline 102, the flow rate monitoring pipeline 103 and the purge and pressure maintaining gas secondary pressure reducing pipeline 106 form a test pipeline 112 connected to the fuel cell stack 111 to be tested. The gas supply system 100 has a plurality of test pipelines 112 respectively connected to different fuel cell stacks 111 to be tested. Each test pipeline 112 includes a hydrogen gas secondary pressure reducing pipeline 102, a flow rate monitoring pipeline 103 and a purge and pressure maintaining gas secondary pressure reducing pipeline 106. The hydrogen gas secondary pressure reducing pipeline 102 is connected to the hydrogen gas supply pipeline 101, and the purge and pressure maintaining gas secondary pressure reducing pipeline 106 is respectively connected to the nitrogen gas supply pipeline 104 and the helium gas supply pipeline 105 for pressure reduction. It is easy to understand that multiple test pipelines 112 can be connected to different fuel cell stacks to meet different test requirements. In Figure 2 two test circuits are shown, and in actual applications, more test circuits can be configured according to test requirements.

[0086] Preferably, refer to Figure 1, the gas supply system 100 further includes a nitrogen external pipeline 113. The nitrogen external pipeline 113 is connected to the output end of the nitrogen supply pipeline 104. The nitrogen external pipeline 113 reduces the pressure of the nitrogen provided by the nitrogen supply pipeline 104, and the output end of the nitrogen external pipeline 113 is connected to the hydrogen supply pipeline 101. As needed, the nitrogen external pipeline 113 reduces the pressure of the nitrogen provided by the nitrogen supply pipeline 104 and then sends it into the hydrogen supply pipeline 101 to purge various valves in the hydrogen supply pipeline 101.

[0087] Preferably, the gas supply system 100 further includes a control host (not shown in the figure). The control host is electrically connected to the electronic valves in each pipeline of the gas supply system 100, and the control host is used to control the electronic valves in each pipeline to automatically achieve the functions of hydrogen gas supply, purging and pressure maintaining.

[0088] Figure 3 shows Figure 1 the circuit diagram of the hydrogen supply pipeline 101 in. As shown in the figure, preferably, the primary hydrogen pressure reducing device 107 includes two groups of pressure reducing valve groups connected in parallel on the hydrogen supply pipeline 101. Each group of pressure reducing valve groups includes a first high-pressure hydrogen ball valve 114, a first high-pressure hydrogen regulating valve 115, and a first low-pressure hydrogen pneumatic ball valve 116 connected in series. The two groups of pressure reducing valve groups can be used alone, and the other group is used as a backup. The two groups of pressure reducing valve groups can also be used together. The usage scheme of the two groups of pressure reducing valve groups is determined according to the pressure of hydrogen gas to be provided.

[0089] Preferably, a gas sampling and detection port 117 is provided on the pipeline at the output ends of the two groups of pressure reducing valve groups. A third low-pressure hydrogen ball valve 118 and a first low-pressure hydrogen needle valve 119 are connected to the pipeline at the output ends of the two groups of pressure reducing valve groups. The corresponding valves can be opened as needed so that the hydrogen gas reduced by the two groups of pressure reducing valve groups passes through the third low-pressure hydrogen ball valve 118 and the first low-pressure hydrogen needle valve 119 to reach the gas sampling and detection port 117.

[0090] Preferably, three parallel gas pipelines are provided on the pipeline at the output ends of the two groups of pressure reducing valve groups and connected to the waste gas pipeline. The black arrows indicate the gas transmission direction to ensure the gas use safety of the gas supply system 100. One of the gas pipelines includes a fourth low-pressure hydrogen ball valve 120 and a first hydrogen unloading valve 121 connected in series, one gas pipeline includes a second low-pressure hydrogen needle valve 122, and the other gas pipeline includes a fifth low-pressure hydrogen ball valve 123 and a fourth low-pressure hydrogen pneumatic ball valve 124 connected in series.

[0091] Figure 4 shows Figure 1The circuit diagram of the secondary hydrogen pressure reducing pipeline. Preferably, two parallel pressure reducing pipelines are provided on the secondary hydrogen pressure reducing pipeline 102. Each pressure reducing pipeline includes a second low-pressure hydrogen pneumatic ball valve 125, a second low-pressure hydrogen pressure regulating valve 126, and a second low-pressure hydrogen ball valve 127 connected in series, and a sixth low-pressure hydrogen ball valve 128 connected in parallel with the second low-pressure hydrogen pneumatic ball valve 125. The second low-pressure hydrogen pressure regulating valves 126 in the two pressure reducing pipelines have different pressure regulating ranges. In each pressure reducing pipeline, a waste gas pipeline is connected through a seventh low-pressure hydrogen ball valve 129 and a first low-pressure hydrogen unloading valve 130 connected in series. The secondary hydrogen pressure reducing pipeline 102 can freely switch the required hydrogen output pressure according to the actual use requirements through the pneumatic ball valve linked with the control host and the pressure regulating valves of different pressure levels. At the same time, safety valves and manual evacuation valves are also provided on each pressure reducing pipeline to ensure the gas use safety of the fuel cell stack 111 to be tested. It should be noted that the connection ends h and i of the second low-pressure hydrogen pneumatic ball valve 125 in the secondary hydrogen pressure reducing pipeline 102 are connected to the control host. The direction of the black arrow in the figure is the gas flow direction.

[0092] Preferably, a hydrogen pressure gauge 131, a hydrogen temperature sensor 132, and a hydrogen pressure sensor 133 are provided on the pipeline at the output ends of the two pressure reducing pipelines.

[0093] Figure 5 shows Figure 1 The circuit diagram of the flow monitoring pipeline 103 in. Preferably, the flow monitoring pipeline 103 includes a plurality of mass flow meters 134 connected in parallel. Different mass flow meters 134 have different measurement accuracies to meet the measurement requirements in different accuracy ranges.

[0094] Figure 6 shows Figure 1 The circuit diagram of the nitrogen supply pipeline 104 in. Preferably, the nitrogen supply pipeline 104 includes a primary nitrogen pressure reducing device 108. The primary nitrogen pressure reducing device 108 includes a first high-pressure nitrogen filter 135, a first high-pressure nitrogen needle valve 136, a first high-pressure nitrogen pressure regulating valve 137, and a first low-pressure nitrogen ball valve 138 connected in series. A plurality of nitrogen cylinder connectors 139 are connected to the primary nitrogen pressure reducing device 108 to supply nitrogen to the gas supply system 100. In this embodiment, two parallel gas paths are provided, and the nitrogen cylinder connectors 139 on both sides are respectively connected in parallel to the first low-pressure nitrogen ball valve 138 through the first high-pressure nitrogen filter 135, the first high-pressure nitrogen needle valve 136, and the first high-pressure nitrogen pressure regulating valve 137 to supply nitrogen outward.

[0095] Figure 7 shows Figure 1Schematic diagram of the helium gas supply pipeline. Preferably, the helium gas supply pipeline 105 includes a primary helium gas pressure reducing device 109. The primary helium gas pressure reducing device 109 includes a first helium gas filter 140, a first high-pressure helium gas needle valve 141, a first high-pressure helium gas pressure regulating valve 142, and a first low-pressure helium gas ball valve 143 connected in series. The helium gas cylinder connector 144 is connected to the primary helium gas pressure reducing device 109 to supply helium gas to the gas supply system 100.

[0096] Figure 8 shows Figure 1 Schematic diagram of the secondary pressure reducing pipeline for purging and maintaining pressure gas. The secondary pressure reducing pipeline 106 for purging and maintaining pressure gas includes a nitrogen purging pipeline 145 and a helium pressure maintaining pipeline 146 connected in parallel. The nitrogen purging pipeline 145 includes a first low-pressure nitrogen pressure regulating valve 147, a first pneumatic nitrogen ball valve 148, a second low-pressure nitrogen ball valve 149, and a first low-pressure nitrogen check valve 150 connected in series, and a third low-pressure nitrogen ball valve 151 connected in parallel with the first pneumatic nitrogen ball valve 148. A nitrogen pressure gauge 152 and a nitrogen pressure sensor 153 are also provided on the nitrogen purging pipeline. The helium pressure maintaining pipeline 146 includes a first low-pressure helium pressure regulating valve 154, a first pneumatic helium ball valve 155, a second low-pressure helium ball valve 156, and a first helium check valve 157 connected in series, and a third low-pressure helium ball valve 158 connected to the first pneumatic helium ball valve 155. A helium pressure gauge 159 and a helium pressure sensor 160 are also provided on the helium pressure maintaining pipeline 146. The secondary pressure reducing pipeline 106 for purging and maintaining pressure gas can realize free switching of the pipeline through the control host, and is equipped with check valves to prevent gas leakage, and is equipped with a safety valve and a manual exhaust valve to ensure gas use safety. It should be noted that the connection end a of the first pneumatic nitrogen ball valve 148 in the nitrogen purging pipeline 145 and the connection end c of the first pneumatic helium ball valve 155 in the helium pressure maintaining pipeline 146 are connected to the control host. The direction of the black arrow in the figure is the gas flow direction.

[0097] Figure 9 shows Figure 1 Schematic diagram of the external nitrogen pipeline 113. The external nitrogen pipeline 113 is connected to the output end of the nitrogen gas supply pipeline 104. After the nitrogen gas provided by the nitrogen gas supply pipeline 104 is depressurized, the external nitrogen pipeline 113 can form multiple nitrogen gas delivery ports, which can be respectively delivered to the input end of the hydrogen gas supply pipeline 101 or various valves of the control host. One of the nitrogen gas output ends A is Figure 3 connected to the input end A of the hydrogen gas supply pipeline 101. The direction of the black arrow in the figure is the gas flow direction.

[0098] A gas supply system provided by the present invention has the following advantages:

[0099] 1. The entire gas supply system can be linked with the alarm system. Combining with the design of relevant valve bodies, it realizes the free switching between different gases and different tested fuel cells, solving the problem of centralized and stable gas supply for multiple systems and multiple laboratories.

[0100] 2. Through multi-channel design and safety guarantee linkage technology, it realizes the test within the full pressure and full flow range, establishing an application scenario and safety guarantee as broad as possible.

[0101] 3. Through the bypass design, it realizes the free switching of the gas supply mode in the powered and non-powered states, increasing the usability of the system.

[0102] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention falling within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A gas supply system, comprising: A hydrogen gas supply pipeline, including a primary hydrogen pressure reducing device, and external hydrogen entering the hydrogen gas supply pipeline is reduced in pressure by the primary hydrogen pressure reducing device; A secondary hydrogen pressure reducing pipeline, connected to the hydrogen gas supply pipeline, for reducing the pressure of the hydrogen provided by the hydrogen gas supply pipeline; A flow monitoring pipeline, connected to the secondary hydrogen pressure reducing pipeline, for monitoring the hydrogen flow rate provided by the secondary hydrogen pressure reducing pipeline; A nitrogen gas supply pipeline, including a primary nitrogen pressure reducing device, and external nitrogen entering the nitrogen gas supply pipeline is reduced in pressure by the primary nitrogen pressure reducing device; A helium gas supply pipeline, including a primary helium pressure reducing device, and external helium entering the helium gas supply pipeline is reduced in pressure by the primary helium pressure reducing device; A purge and pressure maintaining gas secondary pressure reducing pipeline, respectively connected to the nitrogen gas supply pipeline and the helium gas supply pipeline, and the output end of the purge and pressure maintaining gas secondary pressure reducing pipeline is connected to the output end of the flow monitoring pipeline. The purge and pressure maintaining gas secondary pressure reducing pipeline respectively reduces the pressure of the nitrogen provided by the nitrogen gas supply pipeline and the helium provided by the helium gas supply pipeline; Among them, The output end of the flow monitoring pipeline is connected to the fuel cell stack to be tested, and the secondary hydrogen pressure reducing pipeline, the flow monitoring pipeline and the purge and pressure maintaining gas secondary pressure reducing pipeline form a test pipeline connected to the fuel cell stack to be tested; The gas supply system has a plurality of the test pipelines respectively connected to different fuel cell stacks to be tested. Each test pipeline includes a secondary hydrogen pressure reducing pipeline, a flow monitoring pipeline and a purge and pressure maintaining gas secondary pressure reducing pipeline. The secondary hydrogen pressure reducing pipeline is connected to the hydrogen gas supply pipeline, and the purge and pressure maintaining gas secondary pressure reducing pipeline is respectively connected to the nitrogen gas supply pipeline and the helium gas supply pipeline for pressure reduction.

2. The gas supply system according to claim 1, characterized in that, It further includes an exhaust gas discharge pipeline, and the hydrogen gas supply pipeline, the secondary hydrogen pressure reducing pipeline and the purge and pressure maintaining gas secondary pressure reducing pipeline are respectively connected to the exhaust gas discharge pipeline.

3. The gas supply system according to claim 1, characterized in that, It further includes a nitrogen external pipeline, connected to the output end of the nitrogen gas supply pipeline, for reducing the pressure of the nitrogen provided by the nitrogen gas supply pipeline, and the output end of the nitrogen external pipeline is connected to the hydrogen gas supply pipeline.

4. The gas supply system according to claim 1, characterized in that, The primary hydrogen pressure reducing device includes two groups of pressure reducing valve sets connected in parallel on the hydrogen gas supply pipeline. Each group of pressure reducing valve sets includes a first high-pressure hydrogen ball valve, a first high-pressure hydrogen regulating valve and a first low-pressure hydrogen pneumatic ball valve connected in series. The two groups of pressure reducing valve sets can be used separately or jointly.

5. The gas supply system according to claim 1, characterized in that, It further includes a control host, electrically connected to the electronic valves in each pipeline of the gas supply system, and the control host is used to control the electronic valves in each pipeline to realize hydrogen gas supply and purge and pressure maintaining functions.

6. The gas supply system according to claim 1, characterized in that, On the secondary hydrogen pressure reducing pipeline, there are two pressure reducing pipelines connected in parallel. Each pressure reducing pipeline includes a second low-pressure hydrogen pneumatic ball valve, a second low-pressure hydrogen pressure regulating valve and a second low-pressure hydrogen ball valve connected in series, and a sixth low-pressure hydrogen ball valve connected in parallel with the second low-pressure hydrogen pneumatic ball valve. The second low-pressure hydrogen pressure regulating valves in the pressure reducing pipelines have different pressure regulating ranges.

7. The gas supply system according to claim 1, characterized in that The flow monitoring pipeline includes multiple mass flow meters connected in parallel. Different mass flow meters have different measurement accuracies to meet the measurement requirements within different accuracy ranges.

8. The air supply system according to claim 1, characterized in that, The nitrogen gas supply pipeline includes a primary nitrogen gas pressure reducing device, which includes a first nitrogen gas high-pressure filter, a first nitrogen gas high-pressure needle valve, a first nitrogen gas high-pressure pressure regulating valve, and a first nitrogen gas low-pressure ball valve connected in series.

9. The gas supply system according to claim 1, wherein, The helium gas supply pipeline includes a primary helium gas pressure reducing device, which includes a first helium gas filter, a first helium gas high-pressure needle valve, a first helium gas high-pressure pressure regulating valve, and a first helium gas low-pressure ball valve connected in series.

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