Hydrogen pressure reducing device with explosion-proof function

Abstract

The utility model belongs to hydrogen fuel cell technical field especially relates to a hydrogen pressure reducing device with explosion -proof function. The utility model provides a hydrogen pressure reducing device with explosion -proof function, include: hydrogen delivery pipe, nitrogen delivery pipe, hydrogen pressure reducing valve, nitrogen pressure reducing valve, safety valve, nitrogen purging pipe, emptying pipe and multiple ball valves, pressure gauge and safety pipeline, through hydrogen pressure reducing valve and safety valve overpressure automatic pressure relief function, ensure that system pressure is stable, nitrogen purging pipe and emptying pipe constitute purging system, can remove residual hydrogen in pipeline, avoid the risk of explosion, each ball valve realizes gas source quick opening and closing control, and pressure gauge real -time monitoring pressure state, the device is equipped with check valve to prevent gas backflow, and filter guarantees that gas is pure. The utility model passes through multiple safety design, and the explosion -proof performance and operating safety are improved obviously.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen fuel cell technology, and in particular relates to a hydrogen pressure reducing device with explosion-proof function. Background Technology

[0002] Hydrogen fuel cell systems achieve efficient energy conversion through the electrochemical reaction of hydrogen and oxygen. The reliability of its core component, the hydrogen pipeline, directly affects the system's safety and lifespan. In existing technologies, hydrogen pressure-reducing pipelines typically employ multi-stage pressure-reducing valve assemblies to progressively reduce the hydrogen output from the high-pressure storage tank (35-70 MPa) to the stack's operating pressure (0.1-0.3 MPa). However, this traditional design suffers from the following key drawback: when the system shuts down, residual hydrogen in the pressure-reducing valve assembly and pipelines can easily mix with air to form an explosive gas (the explosion limit of hydrogen is 4%-75%), posing a serious safety hazard, especially in confined spaces or high-temperature environments. Existing solutions largely rely on passive ventilation or delayed start-up protection, resulting in insufficient response efficiency and poor effectiveness. Utility Model Content

[0003] In view of this, the present invention provides a hydrogen pressure reducing device with explosion-proof function to solve the problems of insufficient response efficiency and poor effect of existing technologies that rely on passive ventilation or delayed start protection.

[0004] The technical solution adopted in this utility model is:

[0005] This utility model provides a hydrogen pressure reducing device with explosion-proof function, comprising:

[0006] Pipe mounting plate;

[0007] A hydrogen delivery pipe is installed on the pipeline mounting plate, with one end of the hydrogen delivery pipe being the inlet and the other end being the outlet. A hydrogen pressure reducing valve is installed on the hydrogen delivery pipe.

[0008] A nitrogen delivery pipe is mounted on the pipeline mounting plate and is parallel to the hydrogen delivery pipe. One end of the nitrogen delivery pipe is connected to a nitrogen purging pipe, and the other end of the nitrogen purging pipe is connected to the hydrogen delivery pipe. A one-way valve is provided on the nitrogen purging pipe.

[0009] A safety valve assembly includes a first safety tube, a second safety tube, and a safety valve. The safety valve is connected to one end of the first safety tube and the second safety tube, respectively, and the other end of the first safety tube is connected to the hydrogen delivery tube.

[0010] The drain pipe is connected at one end to the first safety pipe and at the other end to the second safety pipe.

[0011] Preferably, the hydrogen delivery pipe is equipped with a hydrogen front-end pressure gauge and a hydrogen rear-end pressure gauge, which are located at the front and rear ends of the hydrogen pressure reducing valve, for real-time monitoring of the pressure change of the hydrogen after being reduced by the hydrogen pressure reducing valve.

[0012] Preferably, the hydrogen delivery pipe is provided with a hydrogen front-end ball valve near the inlet end, and a hydrogen front-end filter is also provided on the hydrogen delivery pipe between the hydrogen front-end ball valve and the hydrogen front-end pressure gauge.

[0013] Preferably, the nitrogen delivery pipe is provided with a nitrogen front-end pressure gauge, a nitrogen pressure reducing valve, and a nitrogen rear-end pressure gauge in sequence, for real-time monitoring of the pressure change of nitrogen after being reduced by the nitrogen pressure reducing valve.

[0014] Preferably, a nitrogen front-end ball valve is provided at one end of the nitrogen delivery pipe near the nitrogen front-end pressure gauge, and a first tee connector is connected to the nitrogen delivery pipe between the nitrogen front-end ball valve and the nitrogen front-end pressure gauge. The nitrogen purging pipe is connected to the nitrogen delivery pipe through the first tee connector.

[0015] Preferably, the nitrogen purging pipe and the first safety pipe are connected to the hydrogen delivery pipe via a four-way connector near the outlet end, and the nitrogen purging pipe is also equipped with a nitrogen purging ball valve.

[0016] Preferably, the first safety pipe is provided with a front ball valve of the safety valve, and the second safety pipe is provided with a rear ball valve of the safety valve.

[0017] Preferably, the drain pipe is connected to the first safety pipe via a second tee connector, the drain pipe is equipped with a drain ball valve, and the end of the drain pipe away from the second tee connector and the end of the second safety pipe away from the safety valve are connected via a third tee connector.

[0018] Preferably, the hydrogen delivery pipe, nitrogen delivery pipe, nitrogen purging pipe, first safety pipe, second safety pipe, and vent pipe are all fixed to the pipe mounting plate by a number of pipe positioning components.

[0019] Preferably, the inlet end is connected to a hydrogen gas source, and the outlet end is connected to a gas-using device.

[0020] Beneficial Effects: This invention, by setting up a nitrogen delivery pipe in parallel with the hydrogen delivery pipe and a connected nitrogen purging pipe, combined with a one-way valve, can actively inject inert nitrogen into the hydrogen delivery pipe when the system shuts down, quickly replacing residual hydrogen in the pipeline and preventing hydrogen from mixing with air to form an explosive gas. Compared with traditional passive ventilation or delayed protection, this design significantly improves response efficiency and achieves precise active protection, especially suitable for confined or high-temperature environments. The safety valve assembly is connected to the safety valve through a first safety pipe and a second safety pipe, forming a redundant pressure relief channel. When the pipeline pressure is abnormal, the safety valve can open quickly, directing the gas to a safe area through the first and second safety pipes, avoiding the risk of deflagration caused by local pressure accumulation, and forming a double safety guarantee with nitrogen purging. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of this utility model.

[0022] Figure 1 This is a three-dimensional structural diagram of the hydrogen pressure reducing device with explosion-proof function of this utility model;

[0023] Figure 2 This is a front view of the hydrogen pressure reducing device with explosion-proof function according to this utility model.

[0024] Parts and their numbers in the diagram:

[0025] Pipeline mounting plate 1, pipeline positioning component 11, first tee connector 12, four-way connector 13, second tee connector 14, third tee connector 15, hydrogen delivery pipe 2, inlet end 21, outlet end 22, nitrogen delivery pipe 3, nitrogen purging pipe 31, vent pipe 4, first safety pipe 51, second safety pipe 52, hydrogen pressure reducing valve 6, nitrogen pressure reducing valve 7, hydrogen front-end ball valve 81, nitrogen front-end ball valve 82, nitrogen purging ball valve 83, safety valve front-end ball valve 84, vent ball valve 85, safety valve end ball valve 86, safety valve 87, hydrogen front-end filter 88, check valve 89, hydrogen front-end pressure gauge 91, hydrogen rear-end pressure gauge 92, nitrogen front-end pressure gauge 93, nitrogen rear-end pressure gauge 94. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Unless otherwise specified, embodiments of the present invention and the various features thereof can be combined with each other, all within the protection scope of the present invention.

[0027] Example 1

[0028] See Figures 1-2 This utility model provides a hydrogen pressure reducing device with explosion-proof function, comprising:

[0029] The system includes a pipeline mounting plate 1, a hydrogen delivery pipe 2, a nitrogen delivery pipe 3, a safety valve assembly, and a vent pipe 4. The hydrogen delivery pipe 2 is mounted on the pipeline mounting plate 1, specifically in the middle position. One end of the hydrogen delivery pipe 2 is an inlet 21, and the other end is an outlet 22. A hydrogen pressure reducing valve 6 is installed on the hydrogen delivery pipe 2. The nitrogen delivery pipe 3 is mounted on the pipeline mounting plate 1 and is parallel to the hydrogen delivery pipe 2. The parallel pipeline layout optimizes space utilization and facilitates maintenance and inspection. The overall structure is compact and has high sealing performance. One end of the nitrogen delivery pipe 3 is connected to a nitrogen purging pipe 31, and the other end of the nitrogen purging pipe 31 is connected to the hydrogen delivery pipe 2. A one-way valve 89 is installed on the nitrogen purging pipe 31.

[0030] The safety valve assembly includes a first safety pipe 51, a second safety pipe 52, and a safety valve 87. The safety valve 87 is connected to one end of the first safety pipe 51 and the second safety pipe 52, respectively. The other end of the first safety pipe 51 is connected to the hydrogen delivery pipe 2. One end of the vent pipe 4 is connected to the first safety pipe 51, and the other end is connected to the second safety pipe 52.

[0031] In this embodiment, by setting a nitrogen delivery pipe 3 in parallel with the hydrogen delivery pipe 2 and a connected nitrogen purging pipe 31, combined with a one-way valve 89, inert nitrogen can be actively injected into the hydrogen delivery pipe 2 when the system is shut down, quickly replacing the residual hydrogen in the pipeline and preventing hydrogen from mixing with air to form an explosive gas. Compared to traditional passive ventilation or delayed protection, this design significantly improves response efficiency and achieves precise active protection, especially suitable for enclosed or high-temperature environments. The safety valve assembly is connected to the safety valve 87 via the first safety pipe 51 and the second safety pipe 51, forming a redundant pressure relief channel. When the pipeline pressure abnormally reaches the preset pressure of the safety valve 87, the safety valve 87 can be opened quickly, and the high-pressure gas is directionally discharged to a safe area through the first safety pipe 51 and the second safety pipe 52, avoiding the risk of deflagration caused by local pressure accumulation, forming a double safety guarantee with nitrogen purging. The one-way valve 89 on the nitrogen purging pipe 31 prevents hydrogen from flowing back into the nitrogen pipeline, ensuring that the purging process is unidirectionally controllable. The three-way connection structure between the vent pipe 4 and the safety valve assembly enables directional discharge of abnormal gas, further reducing the risk of explosion.

[0032] The hydrogen delivery pipe 2 is equipped with a hydrogen front-end pressure gauge 91 and a hydrogen rear-end pressure gauge 92, which are located at the front and rear ends of the hydrogen pressure reducing valve 6, and are used to monitor the pressure change of hydrogen after being reduced by the hydrogen pressure reducing valve 6 in real time.

[0033] The hydrogen delivery pipe 2 is provided with a hydrogen front-end ball valve 81 near the inlet end 21. A hydrogen front-end filter 88 is also provided on the hydrogen delivery pipe 2 between the hydrogen front-end ball valve 81 and the hydrogen front-end pressure gauge 91. The filter 88, which is located in front of the hydrogen pressure reducing valve 6, intercepts impurities, prevents the pressure reducing valve from becoming blocked, and extends the service life of the device.

[0034] The nitrogen delivery pipe 3 is equipped with a nitrogen front-end pressure gauge 93, a nitrogen pressure reducing valve 7, and a nitrogen rear-end pressure gauge 94 in sequence, which are used to monitor the pressure change of nitrogen after it is reduced by the nitrogen pressure reducing valve 7 in real time.

[0035] A nitrogen front-end ball valve 82 is provided at one end of the nitrogen delivery pipe 3 near the nitrogen front-end pressure gauge 93. A first tee connector 12 is connected to the nitrogen delivery pipe 3 between the nitrogen front-end ball valve 82 and the nitrogen front-end pressure gauge 93. The nitrogen purging pipe 31 is connected to the nitrogen delivery pipe 3 through the first tee connector 12.

[0036] The nitrogen purge pipe 31 and the first safety pipe 51 are connected to the hydrogen delivery pipe 2 via a four-way connector 13 near the outlet end 22. The nitrogen purge pipe is also equipped with a nitrogen purge ball valve 83.

[0037] The first safety pipe 51 is provided with a safety valve front ball valve 84, and the second safety pipe 52 is provided with a safety valve end ball valve 86. In this embodiment, the hydrogen front ball valve 81, the nitrogen purging ball valve 83 and other ball valves enable segmented control of the pressure reducing pipeline and the purging pipeline, which facilitates emergency shut-off or maintenance operations.

[0038] The vent pipe 4 is connected to the first safety pipe 51 through the second tee connector 14. The vent pipe is equipped with a vent ball valve 85. The end of the vent pipe 4 away from the second tee connector 14 and the end of the second safety pipe 52 away from the safety valve 87 are connected through the third tee connector 15.

[0039] The hydrogen delivery pipe 2, nitrogen delivery pipe 3, nitrogen purging pipe 31, first safety pipe 51, second safety pipe 52, and vent pipe 4 are all fixed to the pipeline mounting plate 1 by several pipeline positioning components 11. The pipeline mounting plate 1 integrates and fixes the hydrogen delivery pipe 2, nitrogen delivery pipe 3, and related functional components. The pipeline positioning components 11 ensure that the connection of each component is stable and reduce the risk of gas leakage caused by vibration.

[0040] The inlet end 21 is connected to a hydrogen gas source, and the outlet end 22 is connected to a gas-using device.

[0041] In this embodiment, besides being introduced to replace hydrogen or oxygen in the pipeline during the start-up or shutdown of the fuel cell system to prevent explosion, nitrogen can also be used to: keep the pipeline system clean and dry, as nitrogen, being a dry and inert gas, can remove moisture or contaminants from the pipeline; and for airtightness detection and testing, after installation or maintenance, nitrogen can be used to test the airtightness of the pipeline, its inert properties avoiding the risk of hydrogen leakage during the test, while allowing the use of pressure change methods to accurately locate the leak point.

[0042] The above description is merely a specific embodiment of this utility model. Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model.

Claims

1. A hydrogen pressure reducing device with explosion-proof function, characterized in that, include: Pipe mounting plate (1); A hydrogen delivery pipe (2) is installed on the pipeline mounting plate (1). One end of the hydrogen delivery pipe (2) is the inlet end (21) and the other end is the outlet end (22). A hydrogen pressure reducing valve (6) is provided on the hydrogen delivery pipe (2). A nitrogen delivery pipe (3) is installed on the pipeline mounting plate (1) and is parallel to the hydrogen delivery pipe (2). One end of the nitrogen delivery pipe (3) is connected to the nitrogen purging pipe (31), and the other end of the nitrogen purging pipe (31) is connected to the hydrogen delivery pipe (2). A one-way valve (89) is provided on the nitrogen purging pipe (31). The safety valve assembly includes a first safety pipe (51), a second safety pipe (52) and a safety valve (87). The safety valve (87) is connected to one end of the first safety pipe (51) and the second safety pipe (52), respectively. The other end of the first safety pipe (51) is connected to the hydrogen delivery pipe (2). The drain pipe (4) is connected at one end to the first safety pipe (51) and at the other end to the second safety pipe (52).

2. The hydrogen pressure reducing device with explosion-proof function according to claim 1, characterized in that, The hydrogen delivery pipe (2) is equipped with a hydrogen front end pressure gauge (91) and a hydrogen rear end pressure gauge (92), which are located at the front and rear ends of the hydrogen pressure reducing valve (6) to monitor the pressure change of hydrogen after pressure reduction by the hydrogen pressure reducing valve (6) in real time.

3. The hydrogen pressure reducing device with explosion-proof function according to claim 2, characterized in that, The hydrogen delivery pipe (2) is provided with a hydrogen front-end ball valve (81) near the inlet end (21), and a hydrogen front-end filter (88) is also provided on the hydrogen delivery pipe (2) between the hydrogen front-end ball valve (81) and the hydrogen front-end pressure gauge (91).

4. The hydrogen pressure reducing device with explosion-proof function according to claim 1, characterized in that, The nitrogen delivery pipe (3) is equipped with a nitrogen front-end pressure gauge (93), a nitrogen pressure reducing valve (7) and a nitrogen rear-end pressure gauge (94) in sequence, which are used to monitor the pressure change of nitrogen after it is reduced by the nitrogen pressure reducing valve (7) in real time.

5. The hydrogen pressure reducing device with explosion-proof function according to claim 4, characterized in that, A nitrogen front-end ball valve (82) is provided at one end of the nitrogen delivery pipe (3) near the nitrogen front-end pressure gauge (93). A first tee connector (12) is connected to the nitrogen delivery pipe (3) between the nitrogen front-end ball valve (82) and the nitrogen front-end pressure gauge (93). The nitrogen purging pipe (31) is connected to the nitrogen delivery pipe (3) through the first tee connector (12).

6. The hydrogen pressure reducing device with explosion-proof function according to claim 1, characterized in that, The nitrogen purging pipe (31) and the first safety pipe (51) are connected to the hydrogen delivery pipe (2) via a four-way connector (13) near the outlet end (22). The nitrogen purging pipe is also equipped with a nitrogen purging ball valve (83).

7. The hydrogen pressure reducing device with explosion-proof function according to claim 1, characterized in that, The first safety pipe (51) is provided with a front ball valve (84) of the safety valve, and the second safety pipe (52) is provided with a rear ball valve (86).

8. The hydrogen pressure reducing device with explosion-proof function according to claim 7, characterized in that, The drain pipe (4) is connected to the first safety pipe (51) through the second tee connector (14). The drain pipe is equipped with a drain ball valve (85). The end of the drain pipe (4) away from the second tee connector (14) and the end of the second safety pipe (52) away from the safety valve (87) are connected through the third tee connector (15).

9. The hydrogen pressure reducing device with explosion-proof function according to claim 1, characterized in that, The hydrogen delivery pipe (2), nitrogen delivery pipe (3), nitrogen purging pipe (31), first safety pipe (51), second safety pipe (52) and vent pipe (4) are all fixed to the pipeline mounting plate (1) by several pipeline positioning components (11).

10. The hydrogen pressure reducing device with explosion-proof function according to claim 1, characterized in that, The inlet end (21) is connected to a hydrogen gas source, and the outlet end (22) is connected to a gas-using device.

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