Device and method for detecting leak rates of connecting members and seal materials in hydrogen-loaded pipelines

Abstract

The present invention provides an apparatus and method for detecting and testing the leakage rate of connecting components and sealing materials in a hydrogen-added pipeline, which includes a sealing module and a detection unit, wherein the sealing module includes a hydrogen-added cylinder, a high-pressure pump, and a high-temperature box connected in series, a test component is installed in the high-temperature box, and one end of the high-temperature box is connected to the detection unit, which includes a drainage method detection unit and a differential pressure method detection unit, and the detection unit obtains leakage detection data and continuously optimizes the leakage rate data to improve the sealing performance of the connecting components and sealing materials in the pipeline.

Description

[Technical Field]

[0001] This invention claims priority to a Chinese patent application filed with the China Patent Office on December 14, 2022, bearing application number 202211606892.0 and entitled "Device and method for detecting and testing the leakage rate of connecting members and sealing materials in hydrogen-added pipelines," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of detecting pipeline connections and seals, and more particularly to a testing device and method for detecting the leakage rate of hydrogen-adding pipeline connections and seals. [Background technology]

[0003] Currently, hydrogen transportation methods include pipeline transportation, transportation using high-pressure cylinders, and transportation using liquefied hydrogen tank trucks, but long-distance pipeline transportation makes it easier to transport large amounts of hydrogen over long distances, so to date, the optimal method has been to add hydrogen to natural gas pipelines for transportation.At present, the development of the hydrogenated natural gas pipeline transportation industry both inside and outside China is still in its early stages, and although many related research studies and projects have been carried out, there are still many problems that need to be solved and improved.

[0004] In long-distance pipeline transportation, pipe segments can be connected using flanges. The addition of sealing rings or gaskets to the flanges can further improve the sealing performance and safety of the flanges. Pipe segments can also be connected by welding. Valves commonly used in pipelines (such as ball valves and shut-off valves) can not only regulate flow but also connect pipe segments. During the transportation of pure hydrogen / hydrogenated natural gas, leakage may occur at the flange seals, pipeline welds, and valves. Furthermore, it has been found that the hydrogen permeability of elastomeric materials, such as rubber, used as sealing materials is significantly higher than that of non-metallic pipe materials, reducing the safety of gas transportation. Therefore, optimizing the sealing performance of pipeline connections and sealing materials and reducing their leakage rate are important for the safe transportation of hydrogenated natural gas pipelines.

[0005] Conventional airtightness detection methods are diverse, including, for example, the bubble detection method, the flow rate detection method, and the helium gas detection method. The bubble detection method can determine the presence and location of leaks in a workpiece. This detection method is simple to operate and has low manufacturing costs, but is inefficient and requires the workpiece to be dried and rust-proofed after detection. The flow rate detection method can quantitatively detect the amount of leak in the workpiece, but it takes time for workpieces with small leaks. Therefore, this detection method is only applicable to workpieces with large leaks. The helium gas detection method can quantitatively calculate the amount of leak in a workpiece, but it is expensive and difficult to detect large workpieces due to the volume of the sealed container. Furthermore, if helium gas leaks into the atmosphere, it can cause environmental damage.

[0006] The transportation of pure hydrogen / hydrogenated natural gas pipelines is still in its infancy, with some technological developments incomplete. Gas leakage rates at flange seal assemblies, pipeline welds, and valves are low. There are limited methods for detecting minute leaks, which limits the accuracy and efficiency of detection. Furthermore, the detection process requires a long time and consumes a lot of resources and labor. Three issues have yet to be quantitatively studied and concluded: For flange seals, how the hydrogenation ratio, operating pressure, ambient temperature, bolt tightening force, flange seal dimensions, flange sealing surface configuration, and sealing ring / gasket material type affect the leakage rate; for welded seam pipelines, how the hydrogenation ratio, operating pressure, ambient temperature, pipeline dimensions, weld seam dimensions, and welding process affect the leakage rate; and for valves, how the hydrogenation ratio, operating pressure, ambient temperature, valve dimensions and type, valve gasket dimensions and material type affect the leakage rate. These are difficult issues that need to be resolved quickly to ensure the safety of pipeline transportation. Summary of the Invention

[0007] To solve the above problems, the present invention proposes a test device and method for detecting the leak rate of connecting members and seals in hydrogen-charging pipelines, based on the requirements for detecting minute leaks and high accuracy, and taking into account the actual operating conditions of hydrogen-charging / pure hydrogen pipelines. The device can detect the leak rate of flange seals, pipeline weld seams, and valves.

[0008] According to some embodiments, the present invention adopts the following technical solutions.

[0009] In a first aspect, the present invention provides a testing device for detecting the leakage rate of connecting members and sealing materials of a hydrogen-added pipeline, which includes a high-temperature box, a control unit, a pressure release unit, and a detection unit, wherein the interior of the high-temperature box is for placing the member to be tested, the air supply unit for introducing gas into the member to be tested includes an intake pipe, a stainless steel cylinder for storing hydrogen-added gas, a pressure gauge, and an automatic shut-off valve, the intake pipe is connected to the stainless steel cylinder and is provided with a pressure gauge and an automatic shut-off valve, the control unit includes a high-pressure pump, a pipeline check valve, and a pressure sensor attached to the intake pipe in sequence, and the pressure release unit is also provided in the intake pipe, and the detection unit is connected to the member to be tested via a leakage pipe and is for detecting the leakage rate of the gas.

[0010] As a further technical solution, the pressure relief unit includes a manual pressure relief valve and an automatic pressure relief valve connected in parallel, and the manual pressure relief valve and the automatic pressure relief valve are connected to the stainless steel cylinder via a pressure relief line.

[0011] As another technical solution, the valve pneumatic energy supply unit further includes a valve pneumatic energy supply unit, which includes a sequentially connected auxiliary aeration inlet, an air duplex unit, a pressure reducing valve, an air pressure gauge, and an electromagnetic valve connected to the manual pressure relief valve, and provides pneumatic power to the manual pressure relief valve and the pneumatic vacuum generator.

[0012] As a further technical solution, the detection unit includes a drainage method detection unit and a differential pressure method detection unit.

[0013] As another technical solution, the drainage method detection unit includes a leak detection tube, a measuring cup and a water tank, the measuring cup is placed in the water tank, the gas leaked from the test component flows through the leak detection tube via the through hole and into the measuring cup, the change in the water level in the measuring cup is recorded, and the volume of the rise in the liquid level is the volume of the leaked gas.

[0014] As another technical solution, the differential pressure method detection unit includes a leak detection tube, a negative pressure sensor, a vacuum valve and a pneumatic vacuum generator, the pneumatic vacuum generator reduces the pressure in the leak detection tube to a vacuum, the pressure in the leak detection tube increases due to the leaked gas, and the negative pressure sensor collects the pressure changes in the leak detection tube in real time to obtain leak detection data.

[0015] As a further technical solution, the pneumatic vacuum generator is further connected to a valve pneumatic energy supply unit, and the valve pneumatic energy supply unit provides energy drive for the pneumatic vacuum generator.

[0016] As a further technical solution, the intake pipe and the test member are fitted together via a screw thread.

[0017] As a further technical solution, the leakage pipe and the test member are fitted together via a screw thread.

[0018] In a second aspect, the present invention provides a method for producing a pharmaceutical composition comprising: Selecting an appropriate hydrogen addition ratio according to the test requirements, and then using a high-pressure pump to increase the pressure of the gas in the hydrogen addition cylinder to a predetermined pressure, while the pressure is displayed in real time by a pressure gauge; A step of filling a test member disposed in a high-temperature box with hydrogen-added gas pressurized by a high-pressure pump so that the gas flows through a pipeline check valve, a pressure gauge, and a pressure sensor; Detecting hydrogen using a drainage method detection unit and a differential pressure method detection unit, transmitting the detected data to a processor in real time, and plotting a volume-time curve and a pressure-time curve; and (c) upon completion of the test, releasing the hydrogen-added gas in the pipeline by a manual pressure release valve and an automatic pressure release valve, and returning the released gas to the hydrogen-added cylinder.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In this invention, the sealing module includes a hydrogen-loaded cylinder, a high-pressure pump, and a high-temperature box connected in series. The test component is mounted in the high-temperature box, and one end of the high-temperature box is connected to a detection unit, which can acquire leak detection data. One procedure has multiple functions: first, it can perform leak rate detection tests on multiple assemblies (flange seals, welded seam pipelines, and valves); second, it can perform a multi-element combined leak detection test, and by studying the acquired data, it can improve the sealing performance of the sealing assembly and solve the difficult problem of safe transportation of hydrogen-loaded / pure hydrogen.

[0021] 2. The present invention can compare the leak detection accuracy by adopting the drainage method and the differential pressure method, and by comparing the accuracy of the two types of detection methods, provides a highly accurate detection method for detecting minute leaks.

[0022] 3. The present invention can determine the influence rules of multiple factors on the connecting components and sealing materials of hydrogen-filled / pure hydrogen pipelines. For flange seals, the quantitative influence rules on the leakage rate of the hydrogen-filled ratio, operating pressure, ambient temperature, bolt tightening force, flange seal dimensions, flange sealing surface shape (flat vs. protruding), and sealing ring / gasket material type (nitrile rubber, polytetrafluoroethylene rubber, metal-wrapped gasket) can be determined. For pipelines with welded seams, the quantitative influence rules on the leakage rate of the hydrogen-filled ratio, operating pressure, ambient temperature, pipeline dimensions, weld seam dimensions, and welding process can be determined. For valves, the quantitative influence rules on the leakage rate of the hydrogen-filled ratio, operating pressure, ambient temperature, valve dimensions and type, valve gasket dimensions and material type can be determined.

[0023] 4. The connection between the intake pipe and the test part, and between the test part and the leak detection pipe of the present invention is made via a screw thread, which makes it easy to remove, has a high safety factor, a long service life, and is easy to maintain.

[0024] The drawings in the specification that form a part of this invention are intended to provide a further understanding of the invention, and the illustrative embodiments of the invention and their descriptions are intended to interpret the invention and are not intended to unduly limit the invention. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a structural schematic diagram of a test device for detecting the leakage rate of connecting members and sealing materials of a hydrogen-adding pipeline in Example 1. FIG. [Figure 2] 1 is a schematic diagram of the detection principle of the leakage rate of a flange-rubber O-ring-bolt with a groove in Example 1. FIG. [Figure 3] FIG. 1 is a schematic diagram illustrating the detection principle of the leakage rate of a flat face flange-metal wound gasket-bolt configuration in Example 1. [Figure 4] 1 is a schematic diagram illustrating the principle of detecting the leakage rate of a welded seam portion of a pipeline in Example 1. FIG. [Figure 5] 1 is a schematic diagram illustrating the detection principle of the leakage rate of the ball valve of Example 1. FIG. [Figure 6] 1 is a schematic diagram illustrating the detection principle of the leakage rate of the shutoff valve in the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] The invention will now be further described with reference to the following figures and examples.

[0027] It should be noted that the following detailed description is for illustrative purposes only and is intended to further explain the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art.

[0028] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the exemplary embodiments according to the present invention. For example, unless the context clearly indicates otherwise, the singular forms used herein are intended to include the plural forms, and it should also be understood that the use of the terms "comprises" and / or "includes" herein indicates the presence of features, steps, operations, devices, assemblies, and / or combinations thereof.

[0029] Example 1: As shown in FIG. 1, this embodiment is a hydrogen-added pipeline connection and sealing material leakage detection test device, which includes a sealing module and a detection unit: The sealing module is composed of five parts: an air supply unit, a control unit, a pressure relief unit, a valve pneumatic energy supply unit and a test component. Specifically, it includes a stainless steel cylinder, a pressure gauge, an automatic shut-off valve, a high-pressure pump, a pipeline check valve, a pressure sensor and a high / low temperature box, which are connected in series. The test component is installed in the high / low temperature box, one end of which is further connected to the detection unit, the pipeline between the pipeline check valve and the pressure sensor is further connected to the input end of the manual pressure relief valve and the input end of the automatic pressure relief valve, and the output end of the manual pressure relief valve and the output end of the automatic pressure relief valve are connected to the input port of the stainless steel cylinder.

[0030] The temperature box mainly simulates the temperature of the environment in which the test component is located, making the test equipment closer to the actual operating conditions.

[0031] In this embodiment, the gas supply unit is composed of a stainless steel cylinder, a pressure gauge, and an automatic shut-off valve. An appropriate hydrogen addition ratio is selected according to the test requirements, and the pressure of the gas in the hydrogen addition cylinder is displayed in real time by the pressure gauge. The gas is then pressurized to a predetermined pressure by a high-pressure pump, and the leakage status of the test component under different hydrogen addition ratios and operating pressures can be determined.

[0032] In this embodiment, the control unit is composed of a high-pressure pump, a pipeline check valve, a pressure sensor, and a high-temperature box. The hydrogen-added gas pressurized by the high-pressure pump flows through the pipeline check valve, pressure gauge, and pressure sensor and is filled into the flange-sealed test component. The test component is placed in the high-temperature box to change the ambient temperature. The control unit can control the temperature of the high-temperature box, the pressure of the intake pipe, etc., and can also determine the leakage status of the test component under different hydrogen-added ratios and operating pressures.

[0033] In this embodiment, the pressure release unit is composed of a manual pressure release valve and an automatic pressure release valve. When the test is completed, the hydrogen-added gas in the pipeline can be released by the manual pressure release valve or the automatic pressure release valve, and the released gas can be returned to the hydrogen-added cylinder, thereby realizing recycling.

[0034] Furthermore, the sealing module further includes a valve pneumatic energy supply unit, which includes a sequentially arranged auxiliary air inlet, an air duplex unit, a pressure reducing valve, an air pressure gauge, and an electromagnetic valve connected to the manual pressure relief valve, and provides pneumatic power to the manual pressure relief valve and the pneumatic vacuum generator.

[0035] Furthermore, the detection unit includes a drainage method detection unit and a differential pressure method detection unit, and the components of each unit will be described below.

[0036] Furthermore, the drainage method detection unit includes a leak detector tube, a measuring cup, and a water tank. When detecting using the drainage method, gas leaked from the test component flows through the leak detector tube via the through-hole and into the measuring cup. The change in the water level in the measuring cup is recorded, and the volume of the rise in the liquid level is the volume of the leaked gas, and a volume-time curve is drawn.

[0037] The differential pressure method detection unit further includes a negative pressure sensor, a vacuum valve, and a pneumatic vacuum generator, which reduces the pressure in the leak detection tube to a vacuum level using the pneumatic vacuum generator, and the pressure in the leak detection tube increases due to leaked gas. The negative pressure sensor collects pressure changes in the leak detection tube in real time to obtain leak detection data and plot a pressure-time curve. The pneumatic vacuum generator is further connected to the valve pneumatic energy supply unit of the sealing module, and the pneumatic vacuum generator is also powered by the valve pneumatic energy supply unit.

[0038] In the present invention, by providing two different types of detection units, it is possible to compare the leak detection accuracy, and by adopting two types of detection technologies, the drainage method and the differential pressure method, and by comparing the accuracy of the two types of detection means, a highly accurate detection method is provided for detecting minute leaks.

[0039] The valve pneumatic energy supply unit is composed of an air duplex unit, a pressure reducing valve, an air pressure gauge, and a solenoid valve. When the test device is in a hydrogen-loaded operating state, the hydrogen valve is powered by an air source to open and close for safety reasons. The valve pneumatic energy supply flow is as follows: air enters through the auxiliary boost inlet and is compressed. To extend the device's service life, the compressed air is purified by filtering other impurities through the air duplex unit. The purified compressed air is then reduced in pressure by the pressure reducing valve, and the air pressure is displayed in real time by the pressure gauge. The air pressure gauge is connected to the solenoid valve and pneumatic vacuum generator. The air flowing through the solenoid valve enters the manual pressure release valve, providing power for opening and closing the manual pressure release valve and pneumatic vacuum generator.

[0040] 2 is a schematic diagram of a flange-rubber O-ring-bolt leak detection system with a groove. The test components include a flange end plate and a flange base. The flange base has two sealing grooves, one of which houses a rubber O-ring and an auxiliary seal ring. The flange end plate and flange base have bolt holes, allowing gas to be introduced to the mating surface between the flange end plate and flange base via an intake pipe. The flange end plate has a through-hole that communicates with the mating surface between the flange end plate and flange base and is connected to a leak detection pipe. The leak rate is then detected.

[0041] 3 is a schematic diagram of the principle of detecting the leak rate of a flat seat flange-metal wound gasket-bolt. The test component includes a flange end plate and a flange base. Two metal wound gaskets and an auxiliary gasket are provided between the flange base and the flange end plate. The flange end plate has two through holes: Through Hole 1 (air intake hole) and Through Hole 2 (gas leak hole). Here, Through Hole 1 communicates with the gap formed by the metal wound gasket, flange end plate, and flange base. Through Hole 2 also communicates with the gap formed by the auxiliary gasket, metal wound gasket, flange end plate, and flange base. Through Hole 1 communicates with the air intake pipe, and Through Hole 2 communicates with the leak detection pipe. The leak rate is then detected.

[0042] Furthermore, Figure 4 is a schematic diagram of the principle of detecting the leakage rate of a welded seam of a pipeline. The test part is a pipeline with a welded seam, both ends of the pipeline are sealed, and a through hole is opened at the intake end. The pipeline is placed in a sealed box, an intake pipe is connected to the end of the pipeline with the through hole, gas is introduced into the pipeline, and a leak detection pipe is connected to the inside of the sealed box, and then the leakage rate is detected.

[0043] Furthermore, Figure 5 is a schematic diagram of the detection principle of the leak rate of a ball valve. The test component is a ball valve, both ends of which are sealed, and the ball valve is placed in a sealed box. An intake pipe is connected to the flow path of the ball valve, gas is introduced into the ball valve, and a leak detection pipe is connected to the inside of the sealed box, and then the leak rate is detected.

[0044] 6 is a schematic diagram of the principle of detecting the leakage rate of a shutoff valve. The test component is a shutoff valve, which is sealed at both ends and placed in a sealed box. An intake pipe is connected to the shutoff valve flow path, gas is introduced into the shutoff valve, and a leak detection pipe is connected to the inside of the sealed box. The leakage rate is then detected.

[0045] The connections between the intake pipe and the test components (the flange up-end plate, the welded seam of the pipeline, the ball valve, and the shut-off valve), and between the test components (the flange up-end plate, the welded seam of the pipeline, the ball valve, and the shut-off valve) and the leak detection pipe are made via threads, which makes them easy to remove, has a high safety factor, a long service life, and is easy to maintain.

[0046] The device in this embodiment can determine the influence rules of multiple factors on the connectors and seals of hydrogen-filled / pure hydrogen pipelines. For flange seals, the quantitative influence rules on the leakage rate of the hydrogen-filled ratio, operating pressure, ambient temperature, bolt tightening force, flange seal dimensions, flange sealing surface shape (flat vs. protruding), and sealing ring / gasket material type (nitrile rubber, polytetrafluoroethylene rubber, metal-wrapped gasket) can be determined. For pipelines with welded seams, the quantitative influence rules on the leakage rate of the hydrogen-filled ratio, operating pressure, ambient temperature, pipeline dimensions, weld seam dimensions, and welding process can be determined. For valves, the quantitative influence rules on the leakage rate of the hydrogen-filled ratio, operating pressure, ambient temperature, valve dimensions and type, and valve gasket dimensions and material type can be determined.

[0047] Example 2: This embodiment provides a method for operating a testing device for detecting leakage rates of connections and seals in a hydrogen-loading pipeline, including:

[0048] (1) Select an appropriate hydrogen addition ratio according to the test requirements, and the pressure of the gas in the hydrogen addition cylinder is displayed in real time by a pressure gauge, and then the gas is pressurized to the specified pressure by a high-pressure pump.

[0049] (2) The hydrogen-added gas pressurized by the high-pressure pump flows through the pipeline check valve, pressure gauge, and pressure sensor and is filled into the flange-sealed test component, and the test component is placed in a high-temperature box to change the ambient temperature.

[0050] (3) When detecting hydrogen using the differential pressure method, the pressure inside the leak detection tube is reduced to a vacuum using an air pressure vacuum generator, the pressure inside the leak detection tube increases due to the leaking gas, and the negative pressure sensor collects the pressure changes inside the leak detection tube in real time to obtain leak detection data and plot a pressure-time curve.When detecting using the drainage method, the gas leaking from the tested component flows through the detector tube via the through-hole and into the measuring cup, the change in the water level in the measuring cup is recorded, and the volume of the rise in the liquid level is the volume of the leaked gas, and a volume-time curve is plotted.

[0051] (4) When the test equipment is in operation with hydrogen added, to ensure safety, the hydrogen valve is powered by an air source to open and close. The valve air pressure energy supply flow is as follows: air enters through the auxiliary aeration inlet and is compressed. To extend the service life of the equipment, the compressed air is purified by filtering other impurities through an air duplex unit. The purified compressed air is reduced in pressure through a pressure reducing valve, and the air pressure is displayed in real time on a pressure gauge. The air pressure gauge is connected to a solenoid valve and a pneumatic vacuum generator. The air flowing through the solenoid valve enters a manual pressure release valve, providing power for opening and closing the manual pressure release valve and the pneumatic vacuum generator.

[0052] (5) At the end of the test, the hydrogen-added gas in the pipeline can be released using a manual pressure relief valve or an automatic pressure relief valve, and the released gas can be returned to the hydrogen-added cylinder.

[0053] In this embodiment, the high pressure pump, pneumatic vacuum generator and digital display are all automatically controlled, making operation and data recording easy.

[0054] As described above, the present invention provides a procedure for realizing multi-function testing. First, it is possible to carry out leak rate detection tests on multiple assemblies (flange seals, pipelines with welded seams, and valves). Second, it is possible to carry out multi-element combined leak detection tests, and by studying the obtained data, it is possible to improve the sealing performance of sealing assemblies and solve the difficult problems of safe transportation of hydrogen-added / pure hydrogen.

[0055] Although specific embodiments of the present invention have been described above with reference to the drawings, they are not intended to limit the scope of protection of the present invention. Those skilled in the art will recognize that various modifications or variations that can be made based on the technical solutions of the present invention without requiring creative efforts still fall within the scope of protection of the present invention. [Explanation of symbols]

[0056] 1-1 Pneumatic vacuum generator 1-2 Measuring cups 1-3 Intake pipe 1-4 Leak detection tube 1-5 High / low temperature box 1-6 Flange top cover 1-7 Flange bottom cover 1-8 O-ring 2-1 Pneumatic vacuum generator 2-2 Measuring cup 2-3 Intake pipe 2-4 Leak detection tube 2-5 High / Low Temperature Box 2-6 Flange top cover 2-7 Flange bottom cover 2-8 Metallic wound gasket 3-1 Pneumatic vacuum generator 3-2 Measuring cup 3-3 Intake pipe 3-4 Leak detection tube 3-5 High / Low Temperature Box 3-6 Sealing box 3-7 Welded seam 4-1 Pneumatic vacuum generator 4-2 Measuring cup 4-3 Intake pipe 4-4 Leak detection tube 4-5 High / Low Temperature Box 4-6 Sealing box 4-7 Flow path 5-1 Pneumatic vacuum generator 5-2 Measuring cup 5-3 Intake pipe 5-4 Leak detection tube 5-5 High / Low Temperature Box 5-6 Sealing box 5-7 Flow path

Claims

1. 1. A testing device for detecting the leakage rate of connecting members and sealing materials in a hydrogen-added pipeline, comprising a high-temperature box, a control unit, a pressure release unit and a detection unit, the interior of the high-temperature box being for placing the member to be tested, the air supply unit for introducing gas into the member to be tested comprising an intake pipe, a stainless steel cylinder for storing hydrogen-added gas, a pressure gauge and an automatic shut-off valve, the intake pipe being connected to the stainless steel cylinder and equipped with a pressure gauge and an automatic shut-off valve, the control unit comprising a high-pressure pump, a pipeline check valve and a pressure sensor attached in sequence to the intake pipe, the pressure release unit also being attached to the intake pipe, the detection unit being connected to the member to be tested via a leakage pipe for detecting the leakage rate of gas.

2. 2. The hydrogen-addition pipeline connection member and sealing material leakage detection test device according to claim 1, characterized in that the pressure relief unit comprises a manual pressure relief valve and an automatic pressure relief valve connected in parallel, and the manual pressure relief valve and the automatic pressure relief valve are connected to the stainless steel cylinder via a pressure relief pipe.

3. 2. The hydrogen-addition pipeline connection member and sealing material leakage detection test device according to claim 1, further comprising a valve pneumatic energy supply unit, the valve pneumatic energy supply unit including a sequentially connected auxiliary aeration inlet, an air duplex unit, a pressure reducing valve, an air pressure gauge, and an electromagnetic valve connected to the manual pressure relief valve, and providing pneumatic power to the manual pressure relief valve and the pneumatic vacuum generator.

4. 2. The apparatus for detecting and testing the leakage rate of connecting members and sealing materials of a hydrogen-adding pipeline as claimed in claim 1, wherein the detecting unit comprises a drainage method detecting unit and a differential pressure method detecting unit.

5. The leakage rate detection test device for connecting components and sealing materials of hydrogen-adding pipelines according to claim 4, characterized in that the drainage method detection unit comprises a leak detection tube, a measuring cup and a water tank, the measuring cup is placed in the water tank, the gas leaked from the tested component flows through the leak detection tube via a through hole and into the measuring cup, the change in the water level in the measuring cup is recorded, and the rise in the volume of the liquid level is the volume of the leaked gas.

6. The differential pressure method detection unit comprises a leak detection tube, a negative pressure sensor, a vacuum valve and a pneumatic vacuum generator, the pneumatic vacuum generator reduces the pressure in the leak detection tube to a vacuum, the pressure in the leak detection tube increases due to leaked gas, and the negative pressure sensor collects pressure changes in the leak detection tube in real time to obtain leak detection data.

7. The device for detecting and testing the leakage rate of connecting members and sealing materials of a hydrogen-adding pipeline as described in claim 6, characterized in that the pneumatic vacuum generator is further connected to a valve pneumatic energy supply unit, and the valve pneumatic energy supply unit provides energy driving to the pneumatic vacuum generator.

8. 7. The device for detecting and testing the leakage rate of connecting members and sealing materials of a hydrogen-adding pipeline according to claim 6, wherein the intake pipe and the member to be tested are fitted together via a screw thread.

9. 7. The device for detecting and testing the leakage rate of connecting members and sealing materials of a hydrogen-adding pipeline according to claim 6, wherein the leaking pipe and the member to be tested are fitted together via a screw thread.

10. Select an appropriate hydrogen addition ratio according to the test requirements, and then use a pressure gauge to display the pressure of the gas in the stainless steel cylinder in real time. Then, use a high-pressure pump to increase the pressure to a predetermined level. A step of filling a test member disposed in a high-temperature box with hydrogen-added gas pressurized by a high-pressure pump so that the gas flows through a pipeline check valve, a pressure gauge, and a pressure sensor; Detecting hydrogen using a drainage method detection unit and a differential pressure method detection unit, transmitting the detected data to a processor in real time, and plotting a volume-time curve and a pressure-time curve; A method for operating the device for detecting and testing the leakage rate of connecting members and sealing materials in a hydrogen-added pipeline as described in any one of claims 1 to 9, characterized in that it includes the steps of: at the end of the test, releasing the hydrogen-added gas in the pipeline by the manual pressure release valve and the automatic pressure release valve, and returning the released gas to the hydrogen-added cylinder.

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