A hydrogen gas diaphragm compressor nitrogen replacement system

Abstract

The utility model discloses a hydrogen diaphragm compressor nitrogen replacement system, including compressor, the compressor is connected hydrogen input pipeline and hydrogen output pipeline, hydrogen output pipeline is equipped with seventh pneumatic valve, seventh pneumatic valve is equipped with the nitrogen delivery pipeline of seventh automatic valve of intercommunication, hydrogen input pipeline is equipped with first pneumatic valve, first control pipeline, first control pipeline is equipped with first automatic valve, nitrogen replacement pipeline, nitrogen replacement pipeline is equipped with second pneumatic valve, second control pipeline that is equipped with second automatic valve is arranged between second pneumatic valve and nitrogen replacement pipeline, hydrogen output pipeline is connected sixth discharge pipeline, sixth discharge pipeline is connected first discharge pipeline, sixth discharge pipeline is equipped with sixth pneumatic valve, sixth control pipeline that is equipped with sixth automatic valve is arranged between sixth pneumatic valve and nitrogen delivery pipeline, and the safety is high, and the time required for artificial processing is reduced simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen diaphragm compressors, and more particularly to a nitrogen replacement system for a hydrogen diaphragm compressor. Background Technology

[0002] In the hydrogen energy industry, hydrogen diaphragm compressors, as one of the core pieces of equipment, are widely used in hydrogen refueling stations, chemical production, and hydrogen storage and transportation. Due to the flammable and explosive nature of hydrogen, a certain amount of hydrogen may remain inside the system during equipment startup, shutdown, or sudden malfunction. If this gas is not promptly replaced and discharged, it can easily lead to safety accidents. Therefore, introducing a nitrogen purging system into the hydrogen diaphragm compressor system has become an important means of ensuring the safe operation of the equipment.

[0003] Traditional hydrogen diaphragm compressor nitrogen purging systems are typically operated manually. This involves manually opening a valve to introduce nitrogen into the system to replace residual hydrogen, and then venting the mixture into the atmosphere or a centralized venting system via an exhaust pipe. However, this traditional method has several drawbacks: Low level of automation: Traditional systems rely on manual judgment and operation, resulting in slow response speed and difficulty in quickly completing nitrogen replacement in emergency situations, which increases safety hazards.

[0004] Low replacement efficiency: Manual operation may result in unclear replacement paths and incomplete replacement. There may still be blind spots in the system that have not been fully cleaned, affecting the safety of subsequent maintenance or restart.

[0005] Insufficient safety: The lack of pressure release and safe discharge mechanisms may lead to overpressure during the replacement process, resulting in equipment damage.

[0006] Complex maintenance: There are many manual valves, which are cumbersome to operate and have high maintenance costs. They also require high professional skills from operators, increasing the risk of human error. Utility Model Content

[0007] The technical problem solved by this utility model is to provide a nitrogen replacement system for a hydrogen diaphragm compressor.

[0008] This application provides a nitrogen replacement system for a hydrogen diaphragm compressor, comprising, compressor; One end of the compressor is connected to a hydrogen input pipe, and the other end is connected to a hydrogen output pipe. The hydrogen output pipeline is equipped with a seventh pneumatic valve, which is connected to a nitrogen delivery pipeline equipped with a seventh automatic valve. The hydrogen input pipeline is equipped with a first pneumatic valve, and a first control pipeline is provided between the first pneumatic valve and the nitrogen delivery pipeline. The first control pipeline is equipped with a first automatic valve. A nitrogen replacement pipeline is provided between the hydrogen input pipeline and the nitrogen delivery pipeline. The nitrogen replacement pipeline is equipped with a second pneumatic valve. A second control pipeline equipped with a second automatic valve is provided between the second pneumatic valve and the nitrogen replacement pipeline. The hydrogen output pipeline is connected to the sixth discharge pipeline, the sixth discharge pipeline is connected to the first discharge pipeline, the sixth discharge pipeline is located between the compressor and the seventh pneumatic valve, the sixth discharge pipeline is equipped with a sixth pneumatic valve, and a sixth control pipeline equipped with a sixth automatic valve is provided between the sixth pneumatic valve and the nitrogen delivery pipeline.

[0009] Furthermore, the nitrogen replacement pipeline is connected in parallel with a residual gas discharge pipeline. One end of the residual gas discharge pipeline is located between the second pneumatic valve and the hydrogen input pipeline, and the other end is located between the second pneumatic valve and the nitrogen delivery pipeline. The residual gas discharge pipeline is equipped with a first residual gas manual valve and a second residual gas manual valve. The residual gas discharge pipeline is connected to the first discharge pipeline, and the first discharge pipeline is located between the first residual gas manual valve and the second residual gas manual valve. The nitrogen replacement pipeline is equipped with a spare manual valve connected in parallel with the second pneumatic valve, and the spare manual valve is located between the first residual gas manual valve and the second residual gas manual valve.

[0010] Furthermore, the nitrogen replacement pipeline is equipped with a nitrogen replacement check valve, which is located between the second pneumatic valve and the residual gas discharge pipeline and close to the hydrogen delivery pipeline. The residual gas discharge pipeline is equipped with a residual gas discharge check valve, which is located between the first residual gas manual valve and the first discharge pipeline.

[0011] Furthermore, a first backup pipeline is provided between the first discharge pipeline and the hydrogen output pipeline. The first backup pipeline is located between the compressor and the sixth control pipeline, and the first backup pipeline is equipped with a first backup safety valve.

[0012] Furthermore, a second backup pipeline is provided between the first discharge pipeline and the hydrogen output pipeline. The second backup pipeline is equipped with a second backup safety valve and a second backup pneumatic valve. The second backup pneumatic valve is located between the second backup safety valve and the hydrogen delivery pipeline. A fifth control pipeline is provided between the second backup pneumatic valve and the nitrogen delivery pipeline. The fifth control pipeline is equipped with a fifth automatic valve.

[0013] Furthermore, a third connecting pipe is connected between the hydrogen input pipe and the hydrogen output pipe. One end of the third connecting pipe is located between the compressor and the nitrogen replacement pipe, and the other end is located between the sixth control pipe and the seventh pneumatic valve. The third connecting pipe is equipped with a third pneumatic valve. A third control pipe equipped with a third automatic valve is provided between the third pneumatic valve and the nitrogen delivery pipe. The third control pipe is located between the first control pipe and the fifth control pipe.

[0014] Furthermore, the third connecting pipe is equipped with a third one-way valve, which is located between the third pneumatic valve and the hydrogen output pipe.

[0015] Furthermore, the hydrogen input pipeline is equipped with a fourth pneumatic valve, which is located between the compressor and the third control pipeline. A fourth control pipeline equipped with a fourth automatic valve is provided between the fourth pneumatic valve and the nitrogen delivery pipeline. The fourth control pipeline is located between the third automatic valve and the fifth control pipeline.

[0016] Furthermore, it also includes a controller, and the first automatic valve, the second automatic valve, the third automatic valve, the fourth automatic valve, the fifth automatic valve, the sixth automatic valve and the seventh automatic valve are all electrically connected to the controller.

[0017] Furthermore, the hydrogen input pipeline is equipped with a manual hydrogen input valve located between the first control pipeline and the nitrogen replacement pipeline, and the hydrogen output pipeline is equipped with a manual hydrogen output valve located between the nitrogen delivery pipeline and the sixth control pipeline. The sixth pneumatic valve is connected in parallel to a manual discharge pipeline, one end of which is connected to the hydrogen output pipeline and the other end of which is connected to the sixth discharge pipeline. The manual discharge pipeline is equipped with a manual discharge valve.

[0018] Compared with the prior art, this utility model adopts a cooperative structure of a second automatic valve and a second pneumatic valve, a cooperative structure of a first automatic valve and a first pneumatic valve, and a cooperative structure of a seventh automatic valve and a seventh pneumatic valve to realize the automatic control and replacement of hydrogen with nitrogen. In emergency situations such as compressor system shutdown or hydrogen leakage, it avoids manual residue, replaces hydrogen in time, has high safety, and reduces the time required for manual handling. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model.

[0020] Figure 1 This is an overall schematic diagram of the nitrogen replacement system of the hydrogen diaphragm compressor of this utility model; Figure 2 This is a schematic diagram showing the connection between the residual gas emission pipe and the nitrogen replacement pipe of this utility model. Figure 3 This is a schematic diagram of the secondary structural connections of the nitrogen replacement system of the hydrogen diaphragm compressor of this utility model.

[0021] The reference numerals in the attached figures include: Compressor 1; Hydrogen input pipeline 2; Hydrogen input manual valve 21; Hydrogen output pipeline 3; Hydrogen output manual valve 31; Nitrogen delivery pipeline 4; Seventh automatic valve 41; Seventh pneumatic valve 42; Nitrogen backup pipeline 43; Nitrogen backup safety valve 44; Nitrogen manual backup valve 45; First control pipe 5; First automatic valve 51; First pneumatic valve 52; Sixth control pipe 6; Sixth automatic valve 61; Sixth pneumatic valve 62; Manual discharge pipe 621; Manual discharge valve 623; Sixth discharge pipe 63; Nitrogen purging pipeline 7; Second automatic valve 71; Second pneumatic valve 72; Residual gas discharge pipeline 73; First residual gas manual valve 731; Second residual gas manual valve 732; Residual gas discharge check valve 733; Nitrogen purging check valve 74; Residual gas discharge safety valve 75; First discharge pipeline 76; First backup pipeline 761; First backup safety valve 7611; Second backup pipeline 762; Second backup safety valve 763; Second backup pneumatic valve 764; Fifth control pipeline 765; Fifth automatic valve 766; Second control pipeline 77; Backup manual valve 78; Third connecting pipe 8; Third pneumatic valve 81; Third control pipe 82; Third automatic valve 83; Third check valve 84; Fourth control pipe 9; fourth automatic valve 91; fourth pneumatic valve 92. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] like Figure 1As shown, the present invention discloses a hydrogen diaphragm compressor nitrogen replacement system, comprising a compressor 1. The compressor 1 is a hydrogen diaphragm compressor, a device specifically designed for compressing hydrogen. It plays a crucial role in many industrial applications, particularly in situations requiring high-pressure hydrogen, such as hydrogen refueling stations, chemical processes, and hydrogen storage and transportation. This compressor 1 employs diaphragm technology to compress gas. Its working principle involves a hydraulic system driving a metal diaphragm to reciprocate, thereby compressing the hydrogen located between the diaphragm and a fixed wall—a prior art technique. One end of the compressor 1 is connected to a hydrogen input pipe 2, which has a hydrogen input port for inputting hydrogen. The other end of the compressor 1 is connected to a hydrogen output pipe 3, which has a hydrogen output port for outputting the hydrogen compressed by the compressor 1.

[0024] like Figure 1 As shown, the hydrogen output pipeline 3 is equipped with a seventh pneumatic valve 42, which is connected to a nitrogen delivery pipeline 4 equipped with a seventh automatic valve 41. The nitrogen delivery pipeline 4 is equipped with a nitrogen inlet for inputting nitrogen into the nitrogen delivery pipeline 4. After the seventh automatic valve 41 is opened, nitrogen is delivered to the seventh pneumatic valve 42 through the nitrogen delivery pipeline 4 and pressure is applied to the seventh pneumatic valve 42. The seventh pneumatic valve 42 then closes the hydrogen output pipeline 3.

[0025] like Figure 1 As shown, the hydrogen input pipeline 2 is equipped with a first pneumatic valve 52, and a first control pipeline 5 is provided between the first pneumatic valve 52 and the nitrogen delivery pipeline 4. The first control pipeline 5 is equipped with a first automatic valve 51. When the first automatic valve 51 is opened, nitrogen gas passes through the nitrogen delivery pipeline 4 and the first control pipeline 5 in sequence to apply pressure to the first pneumatic valve 52, driving the first pneumatic valve 52 to close the hydrogen input pipeline 2.

[0026] like Figure 1 As shown, a nitrogen replacement pipe 7 is provided between the hydrogen input pipe 2 and the nitrogen delivery pipe 4. The nitrogen replacement pipe 7 is provided with a second pneumatic valve 72. A second control pipe 77 with a second automatic valve 71 is provided between the second pneumatic valve 72 and the nitrogen replacement pipe 7.

[0027] like Figure 1As shown, the hydrogen output pipe 3 is connected to the sixth discharge pipe 63, which is connected to the first discharge pipe 76. The sixth discharge pipe 63 is located between the compressor 1 and the seventh pneumatic valve 42. The sixth discharge pipe 63 is equipped with the sixth pneumatic valve 62. A sixth control pipe 6 equipped with a sixth automatic valve 61 is provided between the sixth pneumatic valve 62 and the nitrogen delivery pipe 4. During nitrogen replacement, the second automatic valve 71 opens, and nitrogen flows sequentially through the nitrogen delivery pipe 4 and the second control pipe 77 to the second pneumatic valve 71. 2. Apply pressure to drive the second pneumatic valve 72 to release the closure of the nitrogen replacement pipeline 7. Nitrogen flows sequentially through the nitrogen delivery pipeline 4 and the nitrogen replacement pipeline 7, replacing the hydrogen in the hydrogen delivery pipeline, compressor 1, and hydrogen output pipeline 3 with nitrogen. At the same time, the sixth automatic valve 61 opens, and nitrogen flows through the nitrogen delivery pipeline 4 and the sixth control pipeline 6 to apply pressure to the airflow pneumatic valve, driving the sixth pneumatic valve 62 to release the closure of the first discharge pipeline 76, so that the replaced hydrogen is discharged through the sixth discharge pipeline and the first discharge pipeline 76.

[0028] Compared with the prior art, this utility model adopts the cooperative structure of the second automatic valve 71 and the second pneumatic valve 72, the cooperative structure of the first automatic valve 51 and the first pneumatic valve 52, and the cooperative structure of the seventh automatic valve 41 and the seventh pneumatic valve 42 to realize the automatic control and replacement of hydrogen with nitrogen. In emergency situations such as the shutdown of the compressor 1 system or hydrogen leakage, manual residue is avoided, hydrogen is replaced in time, the safety is high, and the time required for manual handling is reduced.

[0029] Furthermore, the first emission pipe 76 is connected to a venting system (not shown in the figure) for centralized emission of the discharged hydrogen. The venting system includes a manual venting valve, a safety venting valve, and a venting pipe. The venting pipe is connected to the first emission pipe 76. The safety venting valve is installed on the venting pipe to automatically open when the pressure exceeds a set safety limit, releasing excess pressure to prevent damage to the venting pipe due to overpressure or to prevent safety accidents. The venting pipe is also equipped with a manual venting valve for manual release of the venting pipe's seal, allowing for more flexible adjustments.

[0030] like Figure 2As shown, the nitrogen replacement pipeline 7 is connected in parallel with a residual gas discharge pipeline 73. One end of the residual gas discharge pipeline 73 is located between the second pneumatic valve 72 and the hydrogen input pipeline 2, and the other end is located between the second pneumatic valve 72 and the nitrogen delivery pipeline 4. The residual gas discharge pipeline 73 is equipped with a first residual gas manual valve 731 and a second residual gas manual valve 732. The residual gas discharge pipeline 73 is connected to the first discharge pipeline 76, which is located between the first residual gas manual valve 731 and the second residual gas manual valve 732. The nitrogen replacement pipeline 7 is equipped with a spare manual valve 78 connected in parallel with the second pneumatic valve 72. The spare manual valve 78 is located between the first residual gas manual valve 731 and the second residual gas manual valve 732. When removing residual hydrogen and nitrogen from the nitrogen replacement system, the first automatic valve 51 is closed, and the first pneumatic valve 52 seals the nitrogen replacement pipeline 7. Then, the standby manual valve 78 is manually opened to release the seal on the pipeline connected in parallel with the nitrogen replacement pipeline 7. The first residual gas manual valve 731 and the second residual gas manual valve 732 are manually opened to supply air to the nitrogen inlet of the nitrogen delivery pipeline 4, the hydrogen inlet of the hydrogen inlet pipeline 2, and the hydrogen outlet of the hydrogen outlet pipeline 3. This allows the residual hydrogen and nitrogen to flow through the residual gas discharge pipeline 73 and the first discharge pipeline 76 and be discharged into the venting system, thus thoroughly cleaning the residual hydrogen and nitrogen in the nitrogen replacement system, resulting in a more complete and efficient cleaning process.

[0031] like Figure 2 As shown, the nitrogen replacement pipeline 7 is equipped with a nitrogen replacement check valve 74, which is located between the second pneumatic valve 72 and the residual gas discharge pipeline 73 and is close to the hydrogen delivery pipeline. The residual gas discharge pipeline 73 is equipped with a residual gas discharge check valve 733, which is located between the first residual gas manual valve 731 and the first discharge pipeline 76. This prevents reverse discharge from the nitrogen delivery pipeline 4 during the process of removing nitrogen and hydrogen, thereby increasing safety. Furthermore, the second residual gas manual valve 732 is connected in parallel to a discharge safety pipe equipped with a residual gas discharge safety valve 75, and the residual gas discharge safety valve 75 is located between the second residual gas manual valve 732 and the nitrogen replacement check valve 74. When the second residual gas manual valve 732 malfunctions or cannot be opened in time, and the nitrogen or hydrogen pressure in the nitrogen replacement pipe 7 exceeds a predetermined value, the residual gas discharge safety valve 75 releases the blockage of the discharge safety pipe, allowing the nitrogen replacement pipe 7 near the hydrogen input pipe 2 to connect with the nitrogen replacement pipe 7, releasing pressure on the nitrogen replacement pipe 7 and increasing safety.

[0032] like Figure 2As shown, a first backup pipe 761 is provided between the first discharge pipe 76 and the hydrogen output pipe 3. The first backup pipe 761 is located between the compressor 1 and the sixth control pipe 6. The first backup pipe 761 is provided with a first backup safety valve 7611, which is used to discharge hydrogen into the first discharge pipe 76 through the first backup pipe 761 when the hydrogen pressure in the hydrogen output pipe 3 is too high, thereby increasing safety.

[0033] like Figure 2 As shown, a second backup pipe 762 is provided between the first discharge pipe 76 and the hydrogen output pipe 3. The second backup pipe 762 is equipped with a second backup safety valve 763 and a second backup pneumatic valve 764. The second backup pneumatic valve 764 is located between the second backup safety valve 763 and the hydrogen delivery pipe. A fifth control pipe 765 is provided between the second backup pneumatic valve 764 and the nitrogen delivery pipe 4. The fifth control pipe 765 is equipped with a fifth automatic valve 766. When the hydrogen pressure in the hydrogen output pipe 3 is too high, the fifth automatic valve 766 opens, and nitrogen applies pressure to the fifth pneumatic valve through the fifth control pipe 765. The fifth pneumatic valve then releases the seal on the second backup pipe 762, and the hydrogen in the hydrogen output pipe 3 is discharged into the first discharge pipe 76 through the second backup pipe 762, ensuring the safety of hydrogen delivery through the hydrogen delivery pipe.

[0034] like Figure 3 As shown, a third connecting pipe 8 connects the hydrogen input pipe 2 and the hydrogen output pipe 3. One end of the third connecting pipe 8 is located between the compressor 1 and the nitrogen replacement pipe 7, and the other end is located between the sixth control pipe 6 and the seventh pneumatic valve 42. The third connecting pipe 8 is equipped with a third pneumatic valve 81. A third control pipe 82 with a third automatic valve 83 is provided between the third pneumatic valve 81 and the nitrogen delivery pipe 4. The third control pipe 82 is located between the first control pipe 5 and the fifth control pipe 765. When the compressor 1 malfunctions, the third automatic valve 83 opens, and nitrogen gas applies pressure to the third pneumatic valve 81 through the third control pipe 82. The third pneumatic valve 81 then releases the seal on the third connecting pipe 8, and hydrogen gas flows sequentially through the hydrogen input pipe 2, the third connecting pipe 8, and the hydrogen output pipe 3 to be discharged. This prevents excessive pressure of hydrogen gas in the hydrogen input pipe 2, releases the pressure in the hydrogen input pipe 2, and increases safety. Furthermore, the third connecting pipe 8 is equipped with a third one-way valve 84, which is located between the third pneumatic valve 81 and the hydrogen output pipe 3, ensuring that the hydrogen in the hydrogen output pipe 3 is reversed and transported to the hydrogen input pipe 2 through the third connecting pipe 8, thereby increasing safety.

[0035] likeFigure 3 As shown, the hydrogen input pipeline 2 is equipped with a fourth pneumatic valve 92, which is located between the compressor 1 and the third control pipeline 82. A fourth control pipeline 9 with a fourth automatic valve 91 is provided between the fourth pneumatic valve 92 and the nitrogen delivery pipeline 4. The fourth control pipeline 9 is located between the third automatic valve 83 and the fifth control pipeline 765. When the compressor 1 or the hydrogen output pipeline 3 malfunctions, the fourth automatic valve 91 opens, and nitrogen applies pressure to the fourth pneumatic valve 92 through the fourth control pipeline 9. The fourth pneumatic valve 92 closes the hydrogen input pipeline 2, and hydrogen enters the hydrogen output pipeline 3 through the third connecting pipeline 8, increasing safety.

[0036] A controller (not shown in the figure) is located on the side of the nitrogen replacement system for user observation or operation. The first automatic valve 51, second automatic valve 71, third automatic valve 83, fourth automatic valve 91, fifth automatic valve 766, sixth automatic valve 61, and seventh automatic valve 41 are all electrically connected to the controller. Preferably, the controller is a PLC or a microcontroller.

[0037] A hydrogen concentration detection device (not shown in the figure) is installed above the nitrogen replacement system or inside the workshop. The hydrogen concentration detection device is electrically connected to the controller. When the hydrogen concentration detection device detects that the hydrogen concentration in the external space has increased to a predetermined value, it sends a signal to the controller. The controller then controls the first automatic valve 51, the second automatic valve 71, the third automatic valve 83, the fourth automatic valve 91, the fifth automatic valve 766, the sixth automatic valve 61, and the seventh automatic valve 41 to send signals to replace or release hydrogen, ensuring safety in the workshop and preventing further increases in the hydrogen concentration.

[0038] like Figure 3As shown, the hydrogen input pipeline 2 is equipped with a hydrogen input manual valve 21 located between the first control pipeline 5 and the nitrogen replacement pipeline 7. The hydrogen output pipeline 3 is equipped with a hydrogen output manual valve 31 located between the nitrogen delivery pipeline 4 and the sixth control pipeline 6. The sixth pneumatic valve 62 is connected in parallel to a manual discharge pipeline 621. One end of the manual discharge pipeline 621 is connected to the hydrogen output pipeline 3, and the other end is connected to the sixth discharge pipeline 63. The manual discharge pipeline 621 is equipped with a manual discharge valve 623. This is mainly used for manual hydrogen replacement during routine maintenance or when the controller malfunctions in an emergency. When hydrogen replacement is required, the hydrogen input manual valve 21 and the hydrogen output manual valve 31 are manually closed, and the standby manual valve 78 and the manual discharge valve 623 are manually opened. Nitrogen flows through the nitrogen delivery pipeline 4, the nitrogen replacement pipeline 7, the hydrogen input pipeline 2, the compressor 1, the hydrogen output pipeline 3, and the manual discharge pipeline 621, and is discharged into the first discharge pipeline 76.

[0039] like Figure 3 As shown, the sixth pneumatic valve 62 is connected in parallel with a nitrogen backup pipeline 43. One end of the nitrogen backup pipeline 43 is connected to the nitrogen delivery pipeline 4 and located between the first control pipeline 5 and the nitrogen replacement pipeline 7. The other end of the nitrogen backup pipeline 43 is connected to the hydrogen output pipeline 3 and located between the third connecting pipeline 8 and the seventh pneumatic valve 42. A nitrogen backup safety valve 44 is provided at the end of the nitrogen backup pipeline 43 near the nitrogen replacement pipeline 7. A nitrogen manual backup valve 45 is provided at the end of the nitrogen backup pipeline 43 near the seventh pneumatic valve 42. The nitrogen backup pipeline 43 is connected to the first discharge pipeline 76. When the pressure in the nitrogen delivery pipeline 4 is too high, nitrogen is discharged into the first discharge pipeline 76 through the nitrogen backup pipeline 43. Alternatively, the nitrogen manual backup valve 45 can be manually opened, and nitrogen flows through the nitrogen backup pipeline 43 and the hydrogen output pipeline 3 to discharge, increasing the options for nitrogen discharge and enhancing the safety of nitrogen delivery.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0041] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0042] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0043] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A nitrogen replacement system for a hydrogen diaphragm compressor, characterized in that, include, Compressor (1); The compressor (1) is connected to a hydrogen input pipe (2) at one end and to a hydrogen output pipe (3) at the other end. The hydrogen output pipeline (3) is equipped with a seventh pneumatic valve (42), which is connected to a nitrogen delivery pipeline (4) equipped with a seventh automatic valve (41). The hydrogen input pipeline (2) is provided with a first pneumatic valve (52), and a first control pipeline (5) is provided between the first pneumatic valve (52) and the nitrogen delivery pipeline (4). The first control pipeline (5) is provided with a first automatic valve (51). A nitrogen replacement pipe (7) is provided between the hydrogen input pipe (2) and the nitrogen delivery pipe (4). The nitrogen replacement pipe (7) is provided with a second pneumatic valve (72). A second control pipe (77) with a second automatic valve (71) is provided between the second pneumatic valve (72) and the nitrogen replacement pipe (7). The hydrogen output pipe (3) is connected to the sixth discharge pipe (63), the sixth discharge pipe (63) is connected to the first discharge pipe (76), the sixth discharge pipe (63) is located between the compressor (1) and the seventh pneumatic valve (42), the sixth discharge pipe (63) is provided with a sixth pneumatic valve (62), and a sixth control pipe (6) with a sixth automatic valve (61) is provided between the sixth pneumatic valve (62) and the nitrogen delivery pipe (4).

2. The nitrogen replacement system for a hydrogen diaphragm compressor as described in claim 1, characterized in that, The nitrogen replacement pipeline (7) is connected in parallel with a residual gas discharge pipeline (73). One end of the residual gas discharge pipeline (73) is located between the second pneumatic valve (72) and the hydrogen input pipeline (2), and the other end is located between the second pneumatic valve (72) and the nitrogen delivery pipeline (4). The residual gas discharge pipeline (73) is equipped with a first residual gas manual valve (731) and a second residual gas manual valve (732). The residual gas discharge pipeline (73) is connected to the first discharge pipeline (76), and the first discharge pipeline (76) is located between the first residual gas manual valve (731) and the second residual gas manual valve (732). The nitrogen replacement pipeline (7) is equipped with a spare manual valve (78) connected in parallel with the second pneumatic valve (72). The spare manual valve (78) is located between the first residual gas manual valve (731) and the second residual gas manual valve (732).

3. The nitrogen replacement system for a hydrogen diaphragm compressor as described in claim 2, characterized in that, The nitrogen replacement pipeline (7) is equipped with a nitrogen replacement check valve (74), which is located between the second pneumatic valve (72) and the residual gas discharge pipeline (73) and close to the hydrogen delivery pipeline. The residual gas discharge pipeline (73) is equipped with a residual gas discharge check valve (733), which is located between the first residual gas manual valve (731) and the first discharge pipeline (76).

4. The nitrogen replacement system for a hydrogen diaphragm compressor as described in claim 1, characterized in that, A first backup pipe (761) is provided between the first discharge pipe (76) and the hydrogen output pipe (3). The first backup pipe (761) is located between the compressor (1) and the sixth control pipe (6). The first backup pipe (761) is provided with a first backup safety valve (7611).

5. The nitrogen replacement system for a hydrogen diaphragm compressor as described in claim 1, characterized in that, A second backup pipeline (762) is provided between the first discharge pipeline (76) and the hydrogen output pipeline (3). The second backup pipeline (762) is provided with a second backup safety valve (763) and a second backup pneumatic valve (764). The second backup pneumatic valve (764) is located between the second backup safety valve (763) and the hydrogen delivery pipeline. A fifth control pipeline (765) is provided between the second backup pneumatic valve (764) and the nitrogen delivery pipeline (4). The fifth control pipeline (765) is provided with a fifth automatic valve (766).

6. The nitrogen replacement system for a hydrogen diaphragm compressor as described in claim 5, characterized in that, The hydrogen input pipeline (2) and the hydrogen output pipeline (3) are connected by a third connecting pipeline (8). One end of the third connecting pipeline (8) is located between the compressor (1) and the nitrogen replacement pipeline (7), and the other end is located between the sixth control pipeline (6) and the seventh pneumatic valve (42). The third connecting pipeline (8) is provided with a third pneumatic valve (81). A third control pipeline (82) with a third automatic valve (83) is provided between the third pneumatic valve (81) and the nitrogen delivery pipeline (4). The third control pipeline (82) is located between the first control pipeline (5) and the fifth control pipeline (765).

7. The nitrogen replacement system for a hydrogen diaphragm compressor as described in claim 6, characterized in that, The third connecting pipe (8) is provided with a third one-way valve (84), which is located between the third pneumatic valve (81) and the hydrogen output pipe (3).

8. The nitrogen replacement system for a hydrogen diaphragm compressor as described in claim 6, characterized in that, The hydrogen input pipeline (2) is provided with a fourth pneumatic valve (92), which is located between the compressor (1) and the third control pipeline (82). A fourth control pipeline (9) with a fourth automatic valve (91) is provided between the fourth pneumatic valve (92) and the nitrogen delivery pipeline (4). The fourth control pipeline (9) is located between the third automatic valve (83) and the fifth control pipeline (765).

9. The nitrogen replacement system for a hydrogen diaphragm compressor as described in claim 8, characterized in that, It also includes a controller, and the first automatic valve (51), the second automatic valve (71), the third automatic valve (83), the fourth automatic valve (91), the fifth automatic valve (766), the sixth automatic valve (61) and the seventh automatic valve (41) are all electrically connected to the controller.

10. The nitrogen replacement system for a hydrogen diaphragm compressor as described in any one of claims 1 to 9, characterized in that, The hydrogen input pipeline (2) is provided with a hydrogen input manual valve (21) located between the first control pipeline (5) and the nitrogen replacement pipeline (7). The hydrogen output pipeline (3) is provided with a hydrogen output manual valve (31) located between the nitrogen delivery pipeline (4) and the sixth control pipeline (6). The sixth pneumatic valve (62) is connected in parallel with a manual discharge pipeline (621). One end of the manual discharge pipeline (621) is connected to the hydrogen output pipeline (3), and the other end is connected to the sixth discharge pipeline (63). The manual discharge pipeline (621) is provided with a manual discharge valve (623).

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