Hydrogen resistance test system and method for IV-type hydrogen storage cylinder liner material

Abstract

The invention discloses a hydrogen resistance test system and method for an IV-type hydrogen storage cylinder liner material, and the system comprises a booster pump which is internally introduced with hydrogen conveyed and supplied by a hydrogen cylinder and employs nitrogen as a driving gas; the air outlet pipeline is communicated to the air outlet end of the booster pump, a pressure regulating valve and a second exhaust valve are sequentially installed on the air outlet pipeline in the airflow direction of the air outlet pipeline, a pipeline located between the pressure regulating valve and the second exhaust valve is communicated with a double-branch pipeline, one branch pipeline is sequentially provided with a needle valve and a fourth exhaust valve, and the other branch pipeline is provided with a needle valve and a fifth exhaust valve. And an exhaust valve III, a sample testing mechanism and a three-way valve are sequentially arranged on the other branch pipeline. The device disclosed by the invention can be used for carrying out a hydrogen permeation test on a polymer material under the working pressure of 0.1-99 MPa and the temperature of-40-85 DEG C, and nitrogen is used as driving gas to carry out nitrogen purging on a high-pressure cavity shell and each pipeline for hydrogen replacement, so that data influence of other gases on the test can be avoided.

Description

Technical Field

[0001] The present invention specifically relates to the technical field of hydrogen barrier testing of hydrogen storage cylinder liner materials, and specifically is a hydrogen barrier testing system and method for type IV hydrogen storage cylinder liner materials. Background Art

[0002] The non-metallic liner used in Type IV hydrogen storage cylinders, currently the products mainly use composite materials such as polyamide (PA6), polyamide-11 (PA11), and high-density polyethylene (HDPE). This type of liner material has more superior resistance to hydrogen embrittlement corrosion, longer service life, and is lighter in weight. Compared with traditional metal liners, it is also light in weight, which reduces logistics costs to a certain extent. However, the existing hydrogen barrier test method for this type of liner material is too simplified, resulting in complex permeating gas content, which in turn has a certain impact on the calculation results of hydrogen permeation related parameters. Therefore, the present invention proposes a hydrogen barrier test system and method suitable for a Type IV hydrogen storage cylinder liner material to solve the problems raised in the above background technology. Summary of the invention

[0003] To achieve the above object, the present invention provides the following technical solution: a type IV hydrogen storage cylinder liner material hydrogen barrier testing system, comprising:

[0004] A booster pump, into which hydrogen supplied from a hydrogen bottle is introduced, and the booster pump uses nitrogen as a driving gas;

[0005] An outlet pipeline is connected to the outlet end of the booster pump, a pressure regulating valve and a second exhaust valve are sequentially installed on the outlet pipeline along the air flow direction, and a double-branch pipeline is connected on the pipeline between the pressure regulating valve and the second exhaust valve, wherein:

[0006] A needle valve and an exhaust valve 4 are sequentially arranged on one branch pipeline, and an exhaust valve 3, a sample testing mechanism and a three-way valve are sequentially arranged on another branch pipeline;

[0007] And a gas collection test terminal, which is connected to the lower port of the three-way valve by a pipe.

[0008] Furthermore, as a preference, the air outlet end of the boost pump is also connected to an overflow pipeline, and an overflow valve and an exhaust valve are sequentially installed on the overflow pipeline along the air flow direction thereof.

[0009] Further, as a preference, a pressure gauge 1 is installed on the air outlet pipeline and close to the air outlet end of the booster pump, and a pressure gauge 2 is installed on the pipeline between the exhaust valve 3 and the sample testing mechanism.

[0010] Further, as a preference, the sample testing mechanism comprises

[0011] A high-pressure chamber shell, an air inlet hole is arranged on the end surface thereof, and the high-pressure chamber shell is fixed to the high-pressure flange in an integrated manner;

[0012] A low-pressure chamber shell, with an air outlet on its end surface, the low-pressure chamber shell and the low-pressure flange are fixed in an integrated manner, and the low-pressure flange and the high-pressure flange are locked with bolts;

[0013] A supporting foot, which is fixedly installed in the low-pressure chamber shell;

[0014] and an anti-drop assembly, which is arranged in the low-pressure flange and fixedly connected to the supporting foot;

[0015] A convex ring is fixed in the high-pressure flange, a sample that abuts against the convex ring is inserted into the high-pressure flange, and a porous gasket and a sealing ring are respectively provided on the upper and lower end faces of the sample.

[0016] Further, as a preference, the anti-slip component comprises

[0017] An internal shell is fixed on the supporting foot, and a sliding groove is provided on both the left and right side walls of the internal shell;

[0018] A telescopic pipe, one end of which is fixed to the inner bottom surface of the supporting foot, and the other end of the telescopic pipe is fixed with a pressure ring;

[0019] A pressing tube, one end of which is fixedly connected to the pressing ring, and the other end of which passes through the top port of the built-in shell and extends out;

[0020] A main pressure top, which is fixedly connected to the extended end of the pressure tube;

[0021] A sliding cap is matched and slidably arranged on the built-in shell, and a secondary pressure top is fixed on the top surface of the sliding cap;

[0022] And there are two downward pressing and lifting mechanisms, which are symmetrically installed on both sides of the built-in shell. The two downward pressing and lifting mechanisms can cooperate to lift the auxiliary pressure top. Each of the downward pressing and lifting mechanisms is fixedly connected to the pressure ring by a connecting rod, and the connecting rod is matched and slidably connected with the sliding groove mouth.

[0023] Furthermore, preferably, a spring is wound on the side wall of the telescopic tube, and the spring is connected between the pressure ring and the inner bottom surface of the built-in shell. Under the tension of the spring, the main pressure top is in conflict with the sample, and the horizontal plane of the main pressure top is higher than the horizontal plane of the auxiliary pressure top.

[0024] Further, as a preference, air ports are provided at the center position of the main pressure top and on the side walls of the pressure tube top, so that the pressure tube, pressure ring and telescopic pipe form an air flow channel connected to the inner cavity of the low-pressure chamber shell.

[0025] Further, as a preference, the downward pressing and lifting mechanism comprises

[0026] A support column, which is fixed on the support foot, and a U-shaped cavity is provided in the support column;

[0027] A lower pressure rod is matched and slidably arranged on one side of the U-shaped cavity, the lower pressure rod is fixedly connected to the connecting rod, and the connecting rod is also matched and slidably connected with the second sliding groove on the support column;

[0028] and an upper pressure rod, which is slidably arranged on the other side of the U-shaped cavity, and the top end of the upper pressure rod is fixedly connected to the auxiliary pressure top;

[0029] Wherein, the portion of the U-shaped cavity between the upper pressure rod and the lower pressure rod is filled with hydraulic oil.

[0030] A method for testing the hydrogen barrier of a type IV hydrogen storage cylinder liner material, comprising the following steps:

[0031] Step 1: Prepare the sample for hydrogen permeation test, use a water jet cutter to cut a circular sample with a diameter of 78±1mm, and then clean the surface of the sample with sandpaper;

[0032] Step 2: Install the porous gasket, sample and sealing ring in the high-pressure flange in sequence, then lock the high-pressure flange and the low-pressure flange with bolts, and make the main pressure top contact with the sample;

[0033] Step 3: Check the overall sealing of the sample test mechanism, and adjust the temperature in the laboratory to the set value, and keep it warm for 2 hours;

[0034] Step 4: Evacuate the low-pressure chamber shell, start the booster pump, and use nitrogen to purge the high-pressure chamber shell to prepare for hydrogen replacement;

[0035] Step 5: Open the manual valve of the hydrogen cylinder and monitor the value of pressure gauge 2 to increase the pressure close to the sample test mechanism to the specified test pressure;

[0036] Step 6: During the test, the pressure change in the low-pressure chamber shell is monitored in real time through the gas collection test terminal to determine the hydrogen resistance performance of the sample. The test is then completed.

[0037] The present invention adopts the above technology and has the following beneficial effects compared with the existing technology: in the hydrogen permeation test, the device of the present invention adopts nitrogen as the driving gas, and the high-pressure chamber shell and each pipeline are purged with nitrogen to prepare for hydrogen replacement, which can avoid other gases from affecting the data of the test, and an anti-detachment component is arranged in the sample testing mechanism. When the gas pressure applied to the sample reaches its ultimate strength, it moves into the low-pressure chamber shell and presses down the main pressure top. In this process, the elastic force of the spring is overcome, the pressure ring moves downward, and drives the lower pressure rod to slide down through the connecting rod. Since hydraulic oil is used as the medium between the upper pressure rod and the lower pressure rod, the upper pressure rod is driven to move upward, and the auxiliary pressure top is pushed upward, so that the sample is automatically lifted up while ensuring that the sample can continue to take in air, which can prevent the sample from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of a hydrogen barrier test system for the liner material of a type IV hydrogen storage cylinder

[0039] Figure 2 It is a structural schematic diagram of a sample testing mechanism in a hydrogen barrier testing system for the inner liner material of a type IV hydrogen storage cylinder;

[0040] Figure 3 Schematic diagram of the partial internal structure of the sample testing mechanism in a hydrogen barrier testing system for the liner material of a type IV hydrogen storage cylinder Figure 1 ;

[0041] Figure 4 Schematic diagram of the partial internal structure of the sample testing mechanism in a hydrogen barrier testing system for the liner material of a type IV hydrogen storage cylinder Figure 2 ;

[0042] Figure 5 for Figure 4 A magnified schematic diagram of part A;

[0043] Figure 6 This is a physical picture of the liner material in an embodiment of the present invention.

[0044] In the figure: 1. Booster pump; 2. Overflow valve; 3. Exhaust valve 1; 4. Pressure gauge 1; 5. Pressure regulating valve; 6. Exhaust valve 2; 7. Needle valve; 8. Exhaust valve 3; 9. Exhaust valve 4; 10. Pressure gauge 2; 11. Sample testing mechanism; 12. Three-way valve; 14. Gas collection test terminal; 15. High-pressure chamber shell; 16. High-pressure flange; 17. Low-pressure flange; 18. Bolt; 19. Low-pressure chamber shell; 20. Convex ring; 21. Porous gasket; 22. Sample; 23. Main pressure top; 24. Sealing ring; 25. Support foot; 27. Auxiliary pressure top; 28. Pressure pipe; 29. ​​Connecting rod; 30. Support column; 31. Upper pressure rod; 32. Lower pressure rod; 33. U-shaped cavity; 34. Built-in shell; 35. Telescopic pipe fitting; 36. Spring. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Example: Please see the attached Figure 1-6 The present invention provides a technical solution: a hydrogen barrier testing system for the inner liner material of a type IV hydrogen storage cylinder, comprising:

[0047] A booster pump 1, into which hydrogen supplied by a hydrogen bottle is introduced, and the booster pump 1 uses nitrogen as a driving gas;

[0048] The outlet pipeline is connected to the outlet end of the booster pump 1, and a pressure regulating valve 5 and an exhaust valve 6 are sequentially installed on the outlet pipeline along the air flow direction thereof, and a double-branch pipeline is connected on the pipeline between the pressure regulating valve 5 and the exhaust valve 6, wherein:

[0049] A needle valve 7 and an exhaust valve 9 are sequentially arranged on one branch pipeline, and an exhaust valve 8, a sample testing mechanism 11 and a three-way valve 12 are sequentially arranged on the other branch pipeline;

[0050] And the gas collection test terminal 14 adopts a high-precision vacuum gauge, which is connected to the lower port of the three-way valve 12 by a pipe.

[0051] In this embodiment, the air outlet end of the booster pump 1 is also connected to an overflow pipeline, and an overflow valve 2 and an exhaust valve 3 are sequentially installed on the overflow pipeline along the air flow direction.

[0052] In this embodiment, a pressure gauge 1 4 is installed on the air outlet pipeline and close to the air outlet end of the booster pump 1 , and a pressure gauge 2 10 is installed on the pipeline between the exhaust valve 3 8 and the sample testing mechanism 11 .

[0053] In this embodiment, the sample testing mechanism 11 includes

[0054] The high-pressure chamber shell 15 has an air inlet hole on its end surface, and the high-pressure chamber shell 15 and the high-pressure flange 16 are fixed in an integrated manner;

[0055] The low-pressure chamber shell 19 has an air outlet on its end surface. The low-pressure chamber shell 19 and the low-pressure flange 17 are fixed in an integrated manner, and the low-pressure flange 17 and the high-pressure flange 16 are locked with bolts 18;

[0056] A support foot 25, which is fixedly mounted in the low-pressure chamber shell 19;

[0057] and an anti-drop assembly, which is disposed in the low-pressure flange 17 and fixedly connected to the support foot 25;

[0058] A convex ring 20 is fixed in the high-pressure flange 16 , a sample 22 abutting against the convex ring 20 is inserted into the high-pressure flange 16 , and a porous gasket 21 and a sealing ring 24 are respectively provided on the upper and lower end surfaces of the sample 22 .

[0059] In this embodiment, the anti-drop component includes

[0060] The built-in shell 34 is fixed on the supporting foot 25, and the left and right side walls of the built-in shell 34 are both provided with a slide groove opening 1;

[0061] A telescopic pipe 35, one end of which is fixed to the inner bottom surface of the supporting foot 25, and the other end of the telescopic pipe 35 is fixed with a pressure ring;

[0062] A pressing tube 28, one end of which is fixedly connected to the pressing ring, and the other end of the pressing tube 28 passes through the top port of the built-in shell 34 and extends out;

[0063] The main pressing top 23 is fixedly connected to the extended end of the pressing tube 28;

[0064] A sliding cap, which is matched and slidably arranged on the built-in shell 34, and a secondary pressure top 27 is fixed on the top surface of the sliding cap;

[0065] And there are two downward pressing and lifting mechanisms, which are symmetrically installed on both sides of the built-in shell 34. The two downward pressing and lifting mechanisms can cooperate to lift the auxiliary pressing top 27. Each downward pressing and lifting mechanism adopts a connecting rod 29 to be fixedly connected with the pressing ring, and the connecting rod 29 is matched with a sliding groove mouth for sliding connection.

[0066] In this embodiment, a spring 36 is wound on the side wall of the telescopic tube 35, and the spring 36 is connected between the pressure ring and the inner bottom surface of the built-in shell 34. Under the tension of the spring 36, the main pressure top 23 is in conflict with the sample 22, and the horizontal plane of the main pressure top 23 is higher than the horizontal plane of the auxiliary pressure top 27.

[0067] In this embodiment, air ports are provided at the center of the main pressure top 23 and on the side wall of the top of the pressure tube 28, so that the pressure tube 28, the pressure ring and the telescopic pipe 35 form an air flow channel connected to the inner cavity of the low-pressure chamber shell 19.

[0068] In this embodiment, the pressing and lifting mechanism includes

[0069] A support column 30, which is fixed on the support foot 25, and a U-shaped cavity 33 is provided in the support column 30;

[0070] The lower pressure rod 32 is matched and slidably arranged in a side cavity of the U-shaped cavity 33, the lower pressure rod 32 is fixedly connected with the connecting rod 29, and the connecting rod 29 is also matched and slidably connected with the second sliding groove on the support column 30;

[0071] and an upper pressure rod 31, which is slidably disposed on the other side of the U-shaped cavity 33, and the top end of the upper pressure rod 31 is fixedly connected to the auxiliary pressure top 27;

[0072] The U-shaped cavity 33 between the upper pressure rod 31 and the lower pressure rod 32 is filled with hydraulic oil;

[0073] Specifically, when the air pressure applied to the sample 22 reaches its ultimate strength, it moves into the low-pressure chamber shell and presses down the main pressure top. During this process, the elastic force of the spring 36 is overcome, the pressure ring moves downward, and drives the lower pressure rod 32 to slide down through the connecting rod. Since hydraulic oil is used as the medium between the upper pressure rod 31 and the lower pressure rod 32, the upper pressure rod 31 is driven to move upward, and the secondary pressure top is pushed upward, so that the sample 22 is automatically lifted up to prevent it from falling off while ensuring that the sample 22 can continue to take in air.

[0074] The present invention also provides a method for testing hydrogen resistance of a type IV hydrogen storage cylinder liner material, which can perform a hydrogen permeation test on a polymer material at a working pressure of 0.1 to 99 MPa and a temperature of -40 to 85°C, and specifically comprises the following steps:

[0075] Step 1: Prepare the sample for hydrogen permeation test, use a water jet cutter to cut a circular sample with a diameter of 78±1mm, and then clean the surface of the sample with sandpaper;

[0076] Please refer to the attached Figure 5 , the samples were selected from polyamide (PA6), polyamide-11 (PA11), and high-density polyethylene (HDPE) materials for testing. The diameter of the sample and the area in contact with hydrogen should be equal to or greater than 25mm;

[0077] Step 2: The porous gasket 21, the sample 22 and the sealing ring 24 are sequentially installed in the high-pressure flange 16, and then the high-pressure flange 16 and the low-pressure flange 17 are locked with bolts 18, and the main pressure top 23 is in conflict with the sample 22;

[0078] Step 3: Check the overall sealing of the sample testing mechanism 11, and adjust the temperature in the laboratory to the set value, and keep it warm for 2 hours;

[0079] Step 4: evacuate the low-pressure chamber shell 19, start the booster pump 1, and use nitrogen to purge the high-pressure chamber shell 15 to prepare for hydrogen replacement;

[0080] Step 5: Open the manual valve of the hydrogen cylinder and monitor the value of the pressure gauge 10 to increase the pressure of the test mechanism 11 close to the sample to the specified test pressure;

[0081] Step 6: During the test, the pressure value change in the low-pressure chamber shell 19 is monitored in real time through the gas collection test terminal 14 to determine the hydrogen resistance performance of the sample 22, and the test is completed.

[0082] It should also be added that in order to ensure the correct assembly of the cavity, the diameter of the sample should be polished before assembly, and for the effective installation and sealing inside the sample test mechanism to prevent the sample from leaking in the high-pressure cavity shell or the low-pressure cavity shell, a sealing ring must be used between the sample and the cavity on both sides, and the sealing ring must be replaced after each hydrogen permeation test;

[0083] The control accuracy of the ambient room temperature control device is not less than ±1°C, and the accuracy of the pressure sensor in the experimental system is not less than ±1% of the test pressure, which verifies that the influence of the accuracy of the test component on the calculation results of hydrogen permeation-related parameters is negligible.

[0084] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydrogen barrier test system for the inner liner material of a type IV hydrogen storage cylinder, characterized in that: It includes: A booster pump (1) into which hydrogen supplied from a hydrogen bottle is introduced, and the booster pump (1) uses nitrogen as a driving gas; An air outlet pipeline is connected to the air outlet end of the booster pump (1), a pressure regulating valve (5) and a second exhaust valve (6) are sequentially installed on the air outlet pipeline along the air flow direction thereof, and a double-branch pipeline is connected to the pipeline between the pressure regulating valve (5) and the second exhaust valve (6), wherein: A needle valve (7) and an exhaust valve four (9) are sequentially arranged on one branch pipeline, and an exhaust valve three (8), a sample testing mechanism (11) and a three-way valve (12) are sequentially arranged on another branch pipeline; And a gas collection test terminal (14), which is connected to the lower port of the three-way valve (12) by a pipe.

2. A type IV hydrogen storage cylinder liner material hydrogen barrier testing system according to claim 1, characterized in that: The air outlet end of the booster pump (1) is also connected to an overflow pipeline, on which an overflow valve (2) and an exhaust valve (3) are sequentially installed along the air flow direction.

3. A type IV hydrogen storage cylinder liner material hydrogen barrier testing system according to claim 2, characterized in that: A pressure gauge 1 (4) is installed on the outlet pipeline and close to the outlet end of the booster pump (1), and a pressure gauge 2 (10) is installed on the pipeline between the exhaust valve 3 (8) and the sample testing mechanism (11).

4. A type IV hydrogen storage cylinder liner material hydrogen barrier testing system according to claim 1, characterized in that: The sample testing mechanism (11) comprises A high-pressure chamber shell (15) having an air inlet hole disposed on its end surface, wherein the high-pressure chamber shell (15) and the high-pressure flange (16) are fixed in an integrated manner; A low-pressure chamber shell (19) is provided with an air outlet on its end surface, the low-pressure chamber shell (19) and the low-pressure flange (17) are fixed in an integrated manner, and the low-pressure flange (17) and the high-pressure flange (16) are locked by bolts (18); A supporting foot (25) fixedly mounted in the low-pressure chamber shell (19); and an anti-drop assembly, which is arranged in the low-pressure flange (17) and fixedly connected to the supporting foot (25); A convex ring (20) is fixed inside the high-pressure flange (16), a sample (22) abutting against the convex ring (20) is inserted into the high-pressure flange (16), and a porous gasket (21) and a sealing ring (24) are respectively provided on the upper and lower end surfaces of the sample (22).

5. A type IV hydrogen storage cylinder liner material hydrogen barrier testing system according to claim 4, characterized in that: The anti-drop component comprises A built-in shell (34) fixed on the supporting foot (25), wherein the left and right side walls of the built-in shell (34) are both provided with a sliding groove opening 1; A telescopic pipe (35), one end of which is fixed to the inner bottom surface of the supporting foot (25), and the other end of the telescopic pipe (35) is fixed with a pressure ring; A pressing tube (28), one end of which is fixedly connected to the pressing ring, and the other end of the pressing tube (28) passes through the top port of the built-in shell (34) and protrudes out; A main pressure top (23) fixedly connected to the protruding end of the pressure tube (28); A sliding cap, which is slidably arranged on the built-in shell (34) in a matching manner, and a secondary pressure top (27) is fixed on the top surface of the sliding cap; And two downward pressing and lifting mechanisms are provided and symmetrically mounted on both sides of the built-in shell (34), the two downward pressing and lifting mechanisms can cooperate to lift the auxiliary pressing top (27), each of the downward pressing and lifting mechanisms is fixedly connected to the pressing ring by a connecting rod (29), and the connecting rod (29) is matched and slidably connected with the sliding groove mouth.

6. A type IV hydrogen storage cylinder liner material hydrogen barrier testing system according to claim 5, characterized in that: A spring (36) is wound on the side wall of the telescopic tube (35), and the spring (36) is connected between the pressure ring and the inner bottom surface of the built-in shell (34). Under the tension of the spring (36), the main pressure top (23) is in contact with the sample (22), and the horizontal plane of the main pressure top (23) is higher than the horizontal plane of the auxiliary pressure top (27).

7. A type IV hydrogen storage cylinder liner material hydrogen barrier testing system according to claim 6, characterized in that: Air ports are provided at the center of the main pressure top (23) and on the side wall of the top of the pressure tube (28), so that the pressure tube (28), the pressure ring and the telescopic pipe (35) form an air flow channel connected to the inner cavity of the low-pressure chamber shell (19).

8. A type IV hydrogen storage cylinder liner material hydrogen barrier testing system according to claim 6, characterized in that: The downward pressing and lifting mechanism comprises A support column (30) fixed on the support foot (25), wherein a U-shaped cavity (33) is provided in the support column (30); A lower pressure rod (32) is slidably disposed in a side cavity of the U-shaped cavity (33), the lower pressure rod (32) is fixedly connected to the connecting rod (29), and the connecting rod (29) is also slidably connected to the second sliding groove on the support column (30); and an upper pressure rod (31) which is slidably arranged in the other side cavity of the U-shaped cavity (33), and the top end of the upper pressure rod (31) is fixedly connected to the auxiliary pressure top (27); The portion of the U-shaped cavity (33) located between the upper pressure rod (31) and the lower pressure rod (32) is filled with hydraulic oil.

9. A method for testing the hydrogen barrier of the inner liner material of a type IV hydrogen storage cylinder, characterized in that: It includes the following steps: Step 1: Prepare the sample for hydrogen permeation test, use a water jet cutter to cut a circular sample with a diameter of 78±1mm, and then clean the surface of the sample with sandpaper; Step 2: The porous gasket (21), the sample (22) and the sealing ring (24) are sequentially installed in the high-pressure flange (16), and then the high-pressure flange (16) and the low-pressure flange (17) are locked with bolts (18), and the main pressure top (23) and the sample (22) are in conflict; Step 3: Check the overall tightness of the sample test mechanism (11), and adjust the temperature in the laboratory to the set value, and keep it warm for 2 hours; Step 4: evacuate the low-pressure chamber shell (19), start the booster pump (1), and use nitrogen to purge the high-pressure chamber shell (15) to prepare for hydrogen replacement; Step 5: Open the manual valve of the hydrogen cylinder and, by monitoring the value of the second pressure gauge (10), pressurize the test mechanism (11) close to the sample to the specified test pressure; Step 6: During the test, the pressure value change in the low-pressure chamber shell (19) is monitored in real time through the gas collection test terminal (14) to determine the hydrogen barrier performance of the sample (22). The test is then completed.

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