A hydrogen valve box with adaptive pressure reduction

Abstract

The utility model relates to the technical field of automatic hydrogenation, and discloses a self-adaptive decompression hydrogen valve box, including a box body and a first decompression pipeline, a second decompression pipeline and a third decompression pipeline arranged in the box body, and a low-pressure hydrogen interface, a high-pressure hydrogen interface and an output interface are provided on the box body; the first decompression pipeline and the second decompression pipeline are both connected to the low-pressure hydrogen interface, and the pressure at the outlet end of the first decompression pipeline is higher than that of the second decompression pipeline; the third decompression pipeline is connected to the high-pressure hydrogen interface, and the pressure at the outlet end of the third decompression pipeline is the same as that of the first decompression pipeline, and an automatic air intake valve is provided on the third decompression pipeline; the first decompression pipeline, the second decompression pipeline and the third decompression pipeline are connected to the output interface through an air outlet pipe after being collected, and a pressure transmitter is provided on the air outlet pipe, and the pressure transmitter is connected to the signal of the automatic air intake valve. The beneficial effects of the utility model are: the gas taking rule of low first and high later is realized, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic hydrogenation, in particular to a self-adaptive decompression hydrogen valve box. Background Art

[0002] In hydrogen refueling station applications, low-pressure hydrogen is usually exported to provide fuel cell testing for surrounding users. Since the equipment for these tests is relatively expensive, the hydrogen source needs to be stable and reliable and ensure continuous supply. Currently, the market usually adopts a single-stage pressure reduction, which often results in hydrogen supply interruption or unstable pressure.

[0003] The Chinese utility model patent with the authorization announcement number CN117432932B discloses a hydrogenation station and hydrogenation process. The hydrogenation station includes a gas unloading column, a first sequence control valve box, a hydrogen compressor, a third sequence control valve box, a hydrogenator, a hydrogenation hydrogen storage bottle group, and a station control system connected in sequence along the hydrogen flow direction; a second sequence control valve box connected between the hydrogen compressor and the third sequence control valve box, and a tank hydrogen storage bottle group connected to the second sequence control valve box through a second branch pipe, and the second sequence control valve box is connected back to the second sequence control valve box through the third branch pipe across the hydrogen compressor. In this scheme, when the hydrogen pressure is insufficient, the air compressor is used to achieve secondary pressurization to meet the hydrogen pressure requirements of the vehicle to be hydrogenated, and the structure is relatively complex. Utility Model Content

[0004] The utility model aims to ensure the output hydrogen pressure and temperature and to provide a continuous supply. In view of the above-mentioned shortcomings of the prior art, a self-adaptive decompression hydrogen valve box is proposed.

[0005] A self-adaptive decompression hydrogen valve box comprises a box body and a first decompression pipeline, a second decompression pipeline and a third decompression pipeline arranged in the box body, wherein the box body is provided with a low-pressure hydrogen interface, a high-pressure hydrogen interface and an output interface; the first decompression pipeline and the second decompression pipeline are both connected to the low-pressure hydrogen interface, and the pressure at the outlet end of the first decompression pipeline is higher than that of the second decompression pipeline; the third decompression pipeline is connected to the high-pressure hydrogen interface, and the pressure at the outlet end of the third decompression pipeline is the same as that of the first decompression pipeline, and an automatic air intake valve is arranged on the third decompression pipeline; the first decompression pipeline, the second decompression pipeline and the third decompression pipeline are connected to the output interface through an air outlet pipe after being collected, and a pressure transmitter is arranged on the air outlet pipe, and the pressure transmitter is connected to the signal of the automatic air intake valve.

[0006] The above technical solution is further configured as follows: an air intake manual valve 1 and a pressure reducing valve 1 are provided on the first pressure reducing pipeline, an air intake manual valve 2 and a pressure reducing valve 2 are provided on the second pressure reducing pipeline, and the pressure setting value of the pressure reducing valve 1 is 0.1~1Mpa higher than that of the pressure reducing valve 2.

[0007] The above technical solution is further configured as follows: a pressure reducing valve three is provided on the third pressure reducing pipeline, and a pressure setting value of the pressure reducing valve three is the same as that of the pressure reducing valve one.

[0008] By adopting the above technical solution: a three-way pressure reducing pipeline is adopted, wherein the first pressure reducing pipeline and the second pressure reducing pipeline are both connected to the low-pressure hydrogen interface, the low-pressure hydrogen interface takes low-pressure hydrogen from the 20MPa long tube trailer gas unloading cabinet, and forms an internal parallel channel; the third pressure reducing pipeline is connected to the high-pressure hydrogen interface, and the high-pressure hydrogen interface takes high-pressure hydrogen from the 45MPa hydrogen storage bottle group.

[0009] The pressure setting value of the pressure reducing valve 1 of the first pressure reducing pipeline after pressure reduction is 0.1~1MPa higher than that of the second pressure reducing pipeline. The pressure setting value of the pressure reducing valve 3 after pressure reduction is the same as that of the pressure reducing valve 1. The third pressure reducing pipe is provided with an automatic air intake valve. The first pressure reducing pipeline, the second pressure reducing pipeline and the third pressure reducing pipeline are connected to the output interface through an air outlet pipe after being collected. The air outlet pipe is provided with a pressure transmitter. When the pressure transmitter detects that the output pressure of the air outlet pipe is lower than the outlet setting value of the second pressure reducing valve, the automatic air intake valve is automatically opened.

[0010] The first and second pressure reducing pipelines automatically open one or two pressure reducing lines to adapt to the change of outlet flow rate according to the different settings of the first and second pressure reducing valves, so as to realize the continuous and stable supply of low-pressure hydrogen from the hydrogen filling station. The third pressure reducing pipeline realizes automatic flow compensation through the pressure transmitter and the automatic air inlet valve, further ensuring the continuous and stable supply of low-pressure hydrogen from the hydrogen filling station; and because of the use of high-pressure gas source, it can realize large-flow rapid gas supply.

[0011] Through the above technical solution, the rule of taking in air from low to high is realized, thereby improving the energy utilization efficiency.

[0012] The above technical scheme is further configured as follows: a purge air inlet pipe, a purge interface, a purge air outlet pipe and a vent interface are provided on the box body; the air inlet end of the purge air inlet pipe is connected with the purge interface; the purge air inlet pipe and the purge air outlet pipe are respectively located at two ends of the first pressure reducing pipeline, the second pressure reducing pipeline and the third pressure reducing pipeline; the first pressure reducing pipeline, the second pressure reducing pipeline and the third pressure reducing pipeline are connected in parallel to the purge air inlet pipe; the first pressure reducing pipeline, the second pressure reducing pipeline and the third pressure reducing pipeline are connected in parallel to the purge air outlet pipe, and the air outlet end of the purge air outlet pipe is connected with the vent interface.

[0013] By adopting the above technical solution: one end of the purge interface is connected to the nitrogen bottle group and the other end is connected to the purge inlet pipe, nitrogen is introduced into the three-way pressure reducing pipeline through the purge inlet pipe, and the introduced nitrogen is discharged from the venting interface along the purge outlet pipe. Inert gas nitrogen can be used to clean the three-way pressure reducing pipeline.

[0014] The above technical scheme is further configured as follows: an intake cut-off valve and a check valve are provided at one end of the purge intake pipe near the purge interface, an intake purge replacement cut-off valve is provided between the purge intake pipe and the first pressure reducing pipeline, an intake purge replacement cut-off valve is provided between the purge intake pipe and the second pressure reducing pipeline, and an intake purge replacement cut-off valve is provided between the purge intake pipe and the third pressure reducing pipeline.

[0015] By adopting the above technical solution: an intake cut-off valve and a check valve are provided at one end of the purge inlet pipe close to the purge interface, and an intake purge replacement cut-off valve is provided near one end of the three-way pressure reducing pipeline, so that each nitrogen purge replacement pipeline forms a combination of double cut-off and check valve two, effectively preventing high-pressure hydrogen from flowing back to the low-pressure nitrogen pipeline.

[0016] The above technical scheme is further configured as follows: two purge air inlet pipes are connected to the purge interface, and the connection points of the two purge air inlet pipes with the first pressure reducing pipe are respectively located on both sides of the first pressure reducing valve of the first pressure reducing pipeline, the connection points of the two purge air inlet pipes with the second pressure reducing pipe are respectively located on both sides of the second pressure reducing valve of the second pressure reducing pipeline, and the connection points of the two purge air inlet pipes with the third pressure reducing pipe are respectively located on both sides of the third pressure reducing valve of the third pressure reducing pipeline.

[0017] By adopting the above technical solution: because the nitrogen purge pressure is generally 0.3~0.8MPa, the setting value of the pressure reducing valve on the pressure reducing pipeline may be higher than the nitrogen purge pressure, resulting in the inability of nitrogen to pass through the pressure reducing valve. Therefore, two purge air inlet pipes are set on both sides of the pressure reducing valve, which is conducive to filling the entire pipeline with nitrogen.

[0018] The above technical scheme is further configured as follows: a first purge outlet pipe and a second purge outlet pipe are connected to the vent interface; the first purge outlet pipe is located on the first pressure reducing pipeline, the second pressure reducing pipeline and the third pressure reducing pipeline close to the outlet end, an outlet vent valve one is provided at the junction of the first purge outlet pipe and the first pressure reducing pipeline, an outlet vent valve two is provided at the junction of the first purge outlet pipe and the second pressure reducing pipeline, and an outlet vent valve three is provided at the junction of the first purge outlet pipe and the third pressure reducing pipeline; the second purge outlet pipe is located on the first pressure reducing pipeline, the second pressure reducing pipeline and the third pressure reducing pipeline close to the inlet end, an inlet vent valve one is provided at the junction of the second purge outlet pipe and the first pressure reducing pipeline, an inlet vent valve two is provided at the junction of the second purge outlet pipe and the second pressure reducing pipeline, and an inlet vent valve three is provided at the junction of the second purge outlet pipe and the third pressure reducing pipeline.

[0019] By adopting the above technical solution: by setting two purge inlet pipes and two purge outlet pipes, the nitrogen in the pressure reducing pipeline located upstream of the purge inlet pipe is discharged from the second purge outlet pipe, and the nitrogen in the pressure reducing pipeline located downstream of the purge inlet pipe is discharged from the first purge outlet pipe, thereby realizing nitrogen replacement of the entire pressure reducing pipeline.

[0020] The above technical solution is further configured as follows: a vent pipe is provided in the box body, the vent pipe is connected with the vent interface, the vent pipe is connected in parallel with the first pressure reducing pipeline, the second pressure reducing pipeline and the third pressure reducing pipeline, an exhaust safety valve 1 and a safety valve outlet cut-off valve 1 are provided between the vent pipe and the first pressure reducing pipeline, an exhaust safety valve 2 and a safety valve outlet cut-off valve 2 are provided between the vent pipe and the second pressure reducing pipeline, and an exhaust safety valve 3 and a safety valve outlet cut-off valve 3 are provided between the vent pipe and the first pressure reducing pipeline.

[0021] By adopting the above technical solution: after the hydrogenation is completed, the excess hydrogen in the pressure reducing pipeline can be discharged from the vent interface through the vent pipe.

[0022] The above technical solution is further configured as follows: the purge air inlet pipe and the vent pipe are connected via a vent pipe, and a purge shut-off valve is provided on the vent pipe.

[0023] By adopting the above technical solution: during hydrogenation, the valves on the purge inlet pipe and the purge outlet pipe are closed, and the purge shut-off valve is opened. When the valve on the purge inlet pipe leaks, the hydrogen will be discharged along the vent line through the vent interface and will not flow back into the nitrogen pipeline.

[0024] The above technical solution is further configured as follows: a hydrogen leakage detector is provided in the box.

[0025] The beneficial effects of the utility model are:

[0026] 1. The pressure setting value of the first pressure reducing valve of the first pressure reducing pipeline after pressure reduction is 0.1~1MPa higher than that of the second pressure reducing pipeline. The pressure setting value of the third pressure reducing valve after pressure reduction is the same as that of the first pressure reducing valve. The third pressure reducing pipeline is provided with an automatic air intake valve. The first pressure reducing pipeline, the second pressure reducing pipeline and the third pressure reducing pipeline are connected to the output interface through the air outlet pipe after being collected. The air outlet pipe is provided with a pressure transmitter. When the pressure transmitter detects that the output pressure of the air outlet pipe is lower than the outlet setting value of the second pressure reducing valve, the automatic air intake valve is automatically opened.

[0027] The first and second pressure reducing pipelines adapt to the change of outlet flow rate according to the different settings of pressure reducing valve 1 and pressure reducing valve 2, and automatically open one or two pressure reducing lines to achieve continuous and stable supply of low-pressure hydrogen to the outside of the hydrogen filling station. The third pressure reducing pipeline realizes automatic flow compensation through the pressure transmitter and the automatic air intake valve, further ensuring the continuous and stable supply of low-pressure hydrogen to the outside of the hydrogen filling station; and due to the use of high-pressure gas source, large-flow rapid gas supply can be achieved. Through the above technical solution, the rule of taking gas from low to high is realized, and the energy utilization efficiency is improved.

[0028] 2. An intake cut-off valve and a check valve are provided at one end of the purge inlet pipe near the purge interface, and an intake purge replacement cut-off valve is provided near one end of the three-way pressure reducing pipeline, so that each nitrogen purge replacement pipeline forms a combination of double cut-off and check valve two, effectively preventing high-pressure hydrogen from flowing back to the low-pressure nitrogen pipeline.

[0029] 3. All three pressure reducing pipelines are connected to the vent pipe, and an exhaust safety valve and a mixed safety valve outlet cut-off valve are provided between each pressure reducing pipeline and the vent pipe. After hydrogenation is completed, open the exhaust safety valve and the mixed safety valve outlet cut-off valve, and the excess hydrogen in the pressure reducing pipeline can be discharged from the vent interface through the vent pipe to ensure that hydrogen does not leak. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the utility model.

[0031] 1. First pressure reducing pipeline; 101, air intake manual valve 1; 102, pressure reducing valve 1; 103, air intake purge replacement cut-off valve 1; 104, outlet vent valve 1; 105, inlet vent valve 1; 106, exhaust safety valve 1; 107, safety valve outlet cut-off valve 1; 108, outlet ball valve 1; 2. Second pressure reducing pipeline; 201, air intake manual valve 2; 202, pressure reducing valve 2; 203, air intake purge replacement cut-off valve 2; 204, outlet vent valve 2; 205, inlet vent valve 2; 206, exhaust safety valve 2; 207, safety valve outlet cut-off valve 2; 208, outlet ball valve 2; 3. Third pressure reducing pipeline; 301, air intake automatic valve; 302, pressure reducing Valve three; 303, intake purge replacement shut-off valve three; 304, outlet vent valve three; 305, import vent valve three; 306, exhaust safety valve three; 307, safety valve outlet shut-off valve three; 308, outlet ball valve three; 4, box body; 5, low-pressure hydrogen interface; 6, high-pressure hydrogen interface; 7, output interface; 8, purge inlet pipe; 801, intake shut-off valve; 802, check valve two; 9, purge interface; 10, vent interface; 11, first purge outlet pipe; 12, second purge outlet pipe; 13, vent pipe; 14, vent pipe; 15, purge shut-off valve; 16, pressure transmitter; 17, hydrogen leak detector; 18, check valve one; 19, outlet valve. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0033] Example 1

[0034] A self-adaptive decompression hydrogen valve box, such as Figure 1As shown, it includes a box body 4 and a first pressure reducing pipeline 1, a second pressure reducing pipeline 2 and a third pressure reducing pipeline 3 arranged in the box body 4, and a low-pressure hydrogen interface 5, a high-pressure hydrogen interface 6 and an output interface 7 are provided on the box body 4. One end of the low-pressure hydrogen interface 5 is connected to the 20MPa long tube trailer gas unloading cabinet, and the other end is connected to the first pressure reducing pipeline 1 and the second pressure reducing pipeline 2 to form an internal parallel channel, and a check valve 18 is provided on the pipeline after the first pressure reducing pipeline 1 and the second pressure reducing pipeline 2 are combined; one end of the high-pressure hydrogen interface 6 is connected to the 45MPa hydrogen storage bottle group, and the other end is connected to the third pressure reducing pipeline 3.

[0035] like Figure 1 As shown, the first pressure reducing pipeline 1 is provided with an air intake manual valve 101, a pressure reducing valve 102 and an outlet ball valve 108 in sequence along the air flow direction, the second pressure reducing pipeline 2 is provided with an air intake manual valve 201, a pressure reducing valve 202 and an outlet ball valve 208 in sequence along the air flow direction, the pressure setting value of the pressure reducing valve 102 is 0.1~1Mpa higher than that of the pressure reducing valve 202, the third pressure reducing pipeline 3 is provided with an air intake automatic valve 301, a pressure reducing valve 302 and an outlet ball valve 308 in sequence along the air flow direction, the pressure setting value of the pressure reducing valve 302 is the same as that of the pressure reducing valve 102. The first pressure reducing pipeline 1, the second pressure reducing pipeline 2 and the third pressure reducing pipeline 3 are connected to the output interface 7 through the air outlet pipe after being collected, and the air outlet pipe is provided with an air outlet valve. 19 and the pressure transmitter 16, the pressure transmitter 16 is connected to the air intake automatic valve 301 signal.

[0036] The pressure setting value of the pressure reducing valve 102 of the first pressure reducing pipeline 1 after pressure reduction is 0.1~1MPa higher than that of the second pressure reducing pipeline 2. The pressure setting value of the pressure reducing valve 302 after pressure reduction is the same as that of the pressure reducing valve 102. The third pressure reducing pipe is provided with an automatic air intake valve 301. The first pressure reducing pipeline 1, the second pressure reducing pipeline 2 and the third pressure reducing pipeline 3 are connected to the output interface 7 through the air outlet pipe after being collected. The air outlet pipe is provided with a pressure transmitter 16. When the pressure transmitter 16 detects that the output pressure of the air outlet pipe is lower than the outlet setting value of the second pressure reducing valve, the automatic air intake valve 301 is automatically opened.

[0037] During hydrogenation, the hydrogenation equipment is connected to the output interface 7, the air inlet manual valve 101, the pressure reducing valve 102 and the outlet ball valve 108 on the first pressure reducing pipeline 1, the air inlet manual valve 201, the pressure reducing valve 202 and the outlet ball valve 208 on the second pressure reducing pipeline 2, the check valve 18 and the outlet valve 19 on the outlet pipe are opened, and other valves are closed. Because the pressure setting value of the pressure reducing valve 102 is higher than that of the pressure reducing valve 202, the hydrogen in the 20MPa long tube trailer gas unloading cabinet is hydrogenated through the first pressure reducing pipeline 1; when the outlet pressure of the first pressure reducing pipeline 1 decreases, the second pressure reducing pipeline 2 adaptively replenishes hydrogen to the outlet pipe, and automatically opens the two pressure reducing pipelines, so as to realize the continuous and stable supply of low-pressure hydrogen to the outside of the hydrogenation station.

[0038] When the pressure transmitter 16 on the outlet pipe detects that the outlet pipe pressure drops below the set value of the pressure reducing valve 202, the automatic air inlet valve 301 on the third pressure reducing pipeline 3 opens to take high-pressure hydrogen from the 45MPa hydrogen storage bottle group, implementing the rule of taking in low-pressure gas first and high-pressure gas later, thereby improving energy utilization efficiency.

[0039] Example 2

[0040] like Figure 1 As shown, the box body 4 is provided with a purge air inlet pipe 8, a purge interface 9, a purge air outlet pipe and a venting interface 10. The purge air inlet pipe 8 and the air inlet end are connected to one end of the purge interface 9, and the other end of the purge interface 9 is connected to a nitrogen gas source, and the pressure-reducing pipeline is purged by nitrogen. The outlet end of the purge air inlet pipe 8 is connected in parallel with the first pressure-reducing pipeline 1, the second pressure-reducing pipeline 2 and the third pressure-reducing pipeline 3, the air inlet end of the purge air outlet pipe is connected in parallel with the first pressure-reducing pipeline 1, the second pressure-reducing pipeline 2 and the third pressure-reducing pipeline 3, and the air outlet end of the purge air outlet pipe is connected to the venting interface 10. The purge interface 9 is connected to the purge air inlet pipe 8 at one end and the purge air bottle group at the other end. Nitrogen is introduced into the three-way pressure-reducing pipeline through the purge air inlet pipe 8, and the introduced nitrogen is discharged from the venting interface 10 along the purge air outlet pipe. The three-way pressure-reducing pipeline can be cleaned with inert gas nitrogen.

[0041] like Figure 1 As shown, an intake cut-off valve 801 and a second check valve 802 are provided at one end of the purge inlet pipe 8 near the purge interface 9, an intake purge replacement cut-off valve 103 is provided between the purge inlet pipe 8 and the first pressure reducing pipeline 1, an intake purge replacement cut-off valve 203 is provided between the purge inlet pipe 8 and the second pressure reducing pipeline 2, and an intake purge replacement cut-off valve 303 is provided between the purge inlet pipe 8 and the third pressure reducing pipeline 3. An intake cut-off valve 801 and a second check valve 802 are provided at one end of the purge inlet pipe 8 near the purge interface 9, and an intake purge replacement cut-off valve is provided near one end of the three-way pressure reducing pipelines, so that each nitrogen purge replacement pipeline forms a combination of double cut-off plus a second check valve 802, effectively preventing the high-pressure hydrogen from flowing back to the low-pressure nitrogen pipeline.

[0042] Example 3

[0043] like Figure 1As shown, two purge air inlet pipes 8 are connected to the purge interface 9, and the two purge air inlet pipes 8 are respectively located on both sides of the pressure reducing valve 102 of the first pressure reducing pipeline 1 at the connection with the first pressure reducing pipe, and the two purge air inlet pipes 8 are respectively located on both sides of the pressure reducing valve 202 of the second pressure reducing pipeline 2 at the connection with the second pressure reducing pipe, and the two purge air inlet pipes 8 are respectively located on both sides of the pressure reducing valve 302 of the third pressure reducing pipeline 3 at the connection with the third pressure reducing pipe. Because the nitrogen purge pressure is generally 0.3-0.8 MPa, the pressure reducing valve setting value on the pressure reducing pipeline may be higher than the nitrogen purge pressure, resulting in the inability of nitrogen to pass through the pressure reducing valve. Therefore, two purge air inlet pipes 8 are respectively arranged on both sides of the pressure reducing valve, which is conducive to filling the entire pipeline with nitrogen.

[0044] The vent interface 10 is connected to a first purge outlet pipe 11 and a second purge outlet pipe 12; the first purge outlet pipe 11 is located on the first pressure reducing pipeline 1, the second pressure reducing pipeline 2 and the third pressure reducing pipeline 3 near the outlet end, and an outlet vent valve 104 is provided at the junction of the first purge outlet pipe 11 and the first pressure reducing pipeline 1, and an outlet vent valve 204 is provided at the junction of the first purge outlet pipe 11 and the second pressure reducing pipeline 2. An outlet vent valve three 304 is provided at the connection; the second purge outlet pipe 12 is located on the first pressure reducing pipeline 1, the second pressure reducing pipeline 2 and the third pressure reducing pipeline 3 close to the air inlet end, an inlet vent valve one 105 is provided at the connection between the second purge outlet pipe 12 and the first pressure reducing pipeline 1, an inlet vent valve two 205 is provided at the connection between the second purge outlet pipe 12 and the second pressure reducing pipeline 2, and an inlet vent valve three 305 is provided at the connection between the second purge outlet pipe 12 and the third pressure reducing pipeline 3.

[0045] During the purging process, first open the air intake purge replacement shut-off valve 103, the air intake purge replacement shut-off valve 203, the air intake purge replacement shut-off valve 303, the air intake manual valve 101, the air intake manual valve 201, and the air intake automatic valve 301, close other valves, and introduce a certain amount of nitrogen into the purge inlet pipe 8 through the purge interface 9, so that the purge inlet pipe 8 and the three pressure reducing pipelines are filled with high-pressure nitrogen; then open the outlet vent valve 104, the outlet vent valve 204, the outlet vent valve 304, the inlet vent valve 105, the inlet vent valve 205, and the inlet vent valve 305, and the nitrogen in the pipeline is discharged along the first purge outlet pipe 11 and the second purge outlet pipe 12 respectively. Repeat 3 times to complete the purging of the three pressure reducing pipelines.

[0046] By setting up two purge inlet pipes 8 and two purge outlet pipes, the nitrogen in the pressure reducing pipeline located upstream of the purge inlet pipe 8 is discharged from the second purge outlet pipe 12, and the nitrogen in the pressure reducing pipeline located downstream of the purge inlet pipe 8 is discharged from the first purge outlet pipe 11, thereby realizing nitrogen replacement of the entire pressure reducing pipeline.

[0047] Example 4

[0048] like Figure 1 As shown, a vent pipe 13 is provided in the box body 4, the vent pipe 13 is connected with the vent interface 10, the vent pipe 13 is connected in parallel with the first pressure reducing pipeline 1, the second pressure reducing pipeline 2 and the third pressure reducing pipeline 3, an exhaust safety valve 106 and a safety valve outlet cut-off valve 107 are provided between the vent pipe 13 and the first pressure reducing pipeline 1, an exhaust safety valve 206 and a safety valve outlet cut-off valve 207 are provided between the vent pipe 13 and the second pressure reducing pipeline 2, and an exhaust safety valve 306 and a safety valve outlet cut-off valve 307 are provided between the vent pipe 13 and the first pressure reducing pipeline 1. The three pressure reducing pipelines are all connected with the vent pipe 13, and an exhaust safety valve and a safety valve outlet cut-off valve are provided between each pressure reducing pipeline and the vent pipe 13. After the hydrogenation is completed, the exhaust safety valve and the mixed safety valve outlet cut-off valve are opened, and the excess hydrogen in the pressure reducing pipeline can be discharged from the vent interface 10 through the vent pipe 13 to ensure that the hydrogen does not leak.

[0049] Example 5

[0050] like Figure 1 As shown, the purge inlet pipe 8 is connected to the vent pipe 13 through a vent pipe 14, and a purge cut-off valve 15 is provided on the vent pipe 14. During hydrogenation, the valves on the purge inlet pipe 8 and the purge outlet pipe are closed, and the purge cut-off valve 15 is opened. When the valve on the purge inlet pipe 8 leaks, the hydrogen will be discharged through the vent interface 10 along the vent pipe 14 and will not flow back into the nitrogen pipeline.

[0051] Example 6

[0052] like Figure 1 As shown, a hydrogen leakage detector 17 is provided in the box body 4, and an alarm can be given in time when hydrogen leakage occurs.

[0053] For matters not mentioned above, the prior art applies.

[0054] Although some specific embodiments of the utility model have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the utility model. Those skilled in the art of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but they will not deviate from the direction of the utility model or exceed the scope defined by the attached claims. Those skilled in the art should understand that any modification, equivalent replacement, improvement, etc. made to the above implementation methods based on the technical essence of the utility model should be included in the protection scope of the utility model.

Claims

1. A hydrogen valve box with adaptive pressure reduction, characterized in that: The invention comprises a box body (4) and a first pressure-reducing pipeline (1), a second pressure-reducing pipeline (2) and a third pressure-reducing pipeline (3) arranged in the box body (4); the box body (4) is provided with a low-pressure hydrogen interface (5), a high-pressure hydrogen interface (6) and an output interface (7); the first pressure-reducing pipeline (1) and the second pressure-reducing pipeline (2) are both connected to the low-pressure hydrogen interface (5); the pressure at the outlet end of the first pressure-reducing pipeline (1) is higher than that of the second pressure-reducing pipeline (2); the third pressure-reducing pipeline (3) is connected to the high-pressure hydrogen interface (6); the pressure at the outlet end of the third pressure-reducing pipeline (3) is the same as that of the first pressure-reducing pipeline (1); the third pressure-reducing pipeline (3) is provided with an automatic air intake valve (301); the first pressure-reducing pipeline (1), the second pressure-reducing pipeline (2) and the third pressure-reducing pipeline (3) are connected to the output interface (7) through an air outlet pipe after being collected; the air outlet pipe is provided with a pressure transmitter (16); the pressure transmitter (16) is signal-connected to the automatic air intake valve (301).

2. The self-adaptive decompression hydrogen valve box according to claim 1, characterized in that: The first pressure reducing pipeline (1) is provided with an air intake manual valve 1 (101) and a pressure reducing valve 1 (102), and the second pressure reducing pipeline (2) is provided with an air intake manual valve 2 (201) and a pressure reducing valve 2 (202), and the pressure setting value of the pressure reducing valve 1 (102) is 0.1-1 MPa higher than that of the pressure reducing valve 2 (202).

3. The self-adaptive decompression hydrogen valve box according to claim 1, characterized in that: The third pressure reducing pipeline (3) is provided with a pressure reducing valve three (302), and the pressure setting value of the pressure reducing valve three (302) is the same as that of the pressure reducing valve one (102).

4. The self-adaptive decompression hydrogen valve box according to claim 1, characterized in that: The box body (4) is provided with a purge air inlet pipe (8), a purge interface (9), a purge air outlet pipe and a vent interface (10); the purge air inlet pipe (8) and the purge air outlet pipe are respectively located at two ends of the first pressure reducing pipeline (1), the second pressure reducing pipeline (2) and the third pressure reducing pipeline (3); the air inlet end of the purge air inlet pipe (8) is connected to the purge interface (9); the first pressure reducing pipeline (1), the second pressure reducing pipeline (2) and the third pressure reducing pipeline (3) are connected to the purge air inlet pipe (8) in parallel; the first pressure reducing pipeline (1), the second pressure reducing pipeline (2) and the third pressure reducing pipeline (3) are connected to the purge air outlet pipe in parallel; the air outlet end of the purge air outlet pipe is connected to the vent interface (10).

5. The self-adaptive decompression hydrogen valve box according to claim 4, characterized in that: An air intake shut-off valve (801) and a second check valve (802) are provided at one end of the purge air intake pipe (8) close to the purge interface (9); an air intake purge replacement shut-off valve (103) is provided at the connection between the purge air intake pipe (8) and the first pressure reducing pipeline (1); an air intake purge replacement shut-off valve (203) is provided at the connection between the purge air intake pipe (8) and the second pressure reducing pipeline (2); and an air intake purge replacement shut-off valve (303) is provided at the connection between the purge air intake pipe (8) and the third pressure reducing pipeline (3).

6. The self-adaptive decompression hydrogen valve box according to claim 5, characterized in that: The purge interface (9) is connected to two purge air inlet pipes (8), wherein the connection points of the two purge air inlet pipes (8) with the first pressure reducing pipe are respectively located on both sides of the first pressure reducing valve (102) of the first pressure reducing pipeline (1), the connection points of the two purge air inlet pipes (8) with the second pressure reducing pipe are respectively located on both sides of the second pressure reducing valve (202) of the second pressure reducing pipeline (2), and the connection points of the two purge air inlet pipes (8) with the third pressure reducing pipe are respectively located on both sides of the third pressure reducing valve (302) of the third pressure reducing pipeline (3).

7. The self-adaptive decompression hydrogen valve box according to claim 6, characterized in that: The vent interface (10) is connected to a first purge outlet pipe (11) and a second purge outlet pipe (12); the first purge outlet pipe (11) is connected in parallel with the first pressure reducing pipeline (1), the second pressure reducing pipeline (2) and the third pressure reducing pipeline (3) at a side close to the gas outlet end; a first outlet vent valve (104) is provided at the junction of the first purge outlet pipe (11) and the first pressure reducing pipeline (1); a second outlet vent valve (204) is provided at the junction of the first purge outlet pipe (11) and the second pressure reducing pipeline (2); and a second outlet vent valve (204) is provided at the junction of the first purge outlet pipe (11) and the third pressure reducing pipeline ( 3) an outlet vent valve 3 (304) is provided at the connection; the second purge outlet pipe (12) is connected in parallel with the first pressure reducing pipeline (1), the second pressure reducing pipeline (2) and the third pressure reducing pipeline (3) on the side close to the air inlet end; an inlet vent valve 1 (105) is provided at the connection between the second purge outlet pipe (12) and the first pressure reducing pipeline (1); an inlet vent valve 2 (205) is provided at the connection between the second purge outlet pipe (12) and the second pressure reducing pipeline (2); and an inlet vent valve 3 (305) is provided at the connection between the second purge outlet pipe (12) and the third pressure reducing pipeline (3).

8. The self-adaptive decompression hydrogen valve box according to claim 4, characterized in that: A vent pipe (13) is provided in the housing (4), the vent pipe (13) is in communication with the vent interface (10), a first pressure reducing pipeline (1), a second pressure reducing pipeline (2) and a third pressure reducing pipeline (3) are connected in parallel to the vent pipe (13), an exhaust safety valve (106) and a safety valve outlet cut-off valve (107) are provided between the vent pipe (13) and the first pressure reducing pipeline (1), an exhaust safety valve (206) and a safety valve outlet cut-off valve (207) are provided between the vent pipe (13) and the second pressure reducing pipeline (2), and an exhaust safety valve (306) and a safety valve outlet cut-off valve (307) are provided between the vent pipe (13) and the first pressure reducing pipeline (1).

9. The self-adaptive decompression hydrogen valve box according to claim 8, characterized in that: The purge air inlet pipe (8) and the vent pipe (13) are connected via a vent pipe (14), and a purge shut-off valve (15) is provided on the vent pipe (14).

10. The self-adaptive decompression hydrogen valve box according to claim 1, characterized in that: A hydrogen leakage detector (17) is provided in the box (4).

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