Device and method for detecting high-pressure resistance of hydrogen storage cylinder liner

Abstract

According to the hydrogen storage bottle inner container high pressure resistance detection equipment and detection method, the service performance of a non-pressure-bearing inner container under the high pressure condition can be directly detected through a method of simultaneously applying high pressure inside and outside the inner container, controlling the temperature of a pressure medium and controlling a BOSS structure on the right side of the inner container to axially move along with the pressure of the medium; furthermore, a recyclable, easy-to-process and non-pressure-bearing hard shell is manufactured outside the inner container, so that the deformation of the inner container during testing is efficiently controlled to be consistent with the deformation of the inner container in the hydrogen storage bottle at low cost; more importantly, aiming at the problem that signals are difficult to transmit outwards in a wired mode in a high-voltage container, a high-voltage-resistant signal line interface structure and a related expansion structure are designed, and wired signal transmission between high voltage and low voltage can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of special equipment, and in particular to a high-pressure resistance performance testing device and a testing method for the inner liner of a hydrogen storage bottle. Technical Background

[0002] Composite material fully wrapped hydrogen storage bottles, represented by Type IV hydrogen storage bottles with plastic liner, have the advantage of lightweight and are of great significance to promoting the efficient storage and transportation of the hydrogen energy industry chain. Among them, the performance of the liner as a key component directly determines the service capability and service life of the hydrogen storage bottle. The key to evaluating the quality of the liner lies in accurately locating and evaluating the performance of the liner material, the stress and strain of the liner after molding and after the liner is wrapped with fiber composites under high-pressure environmental conditions. However, the liner of the hydrogen storage bottle cannot withstand high internal and external pressure differences alone (usually the liner will be severely deformed and may explode under internal and external pressure differences of more than 1MPa. The larger the size of the liner, the smaller the ultimate pressure difference it can withstand; 1MPa is far from meeting the design and testing requirements of high pressures such as 35MPa and 70MPa for hydrogen storage bottles). Therefore, the current evaluation of the quality of the liner only includes the performance testing of the liner material and the testing of the entire bottle after it is fully wrapped into a hydrogen storage bottle, and there is no method and equipment for separate testing of the liner under high-pressure environmental conditions:

[0003] Testing of material properties can evaluate the performance of liner materials under service conditions and screen qualified materials, which is an alternative evaluation method. However, material evaluation cannot evaluate the impact of liner structure size effects, such as stress cracking, large deformation, local collapse, local stress strain, etc. caused by size effects, as well as sealing failure caused by sealing rings, sealing surfaces, sealing structures, etc.

[0004] The evaluation of the entire hydrogen storage bottle can comprehensively assess the inner liner material, hydrogen storage bottle sealing, hydrogen storage bottle structural strength and other properties, and is the most practical direct evaluation method. However, direct testing of hydrogen storage bottles involves many factors that lead to failure, including inner liner failure caused by the inner liner molding process, and inner liner failure caused by the winding process and curing process of the wound carbon fiber composite. Overly complex failure factors make it impossible to accurately locate the cause of failure in order to optimize the inner liner structure, inner liner molding process or winding curing process, which in turn leads to extended new product development time and increased costs.

[0005] Therefore, developing a set of equipment that can directly test the inner liner under high-pressure conditions is of great significance for accurately studying the deformation and other physical properties of the inner liner under high-pressure conditions, improving the research and development efficiency of hydrogen storage bottles, and reducing research and development costs.

[0006] The key to solving the difficulty of testing the liner alone under high-pressure conditions is to balance the forces inside and outside the liner to prevent the liner from serious deformation and failure when not in service. Methods for balancing the forces inside and outside the liner include coating the outside of the liner with a pressure-bearing structure that fits the outer dimensions of the liner perfectly, and using the same gas or liquid pressure inside and outside the liner. The pressure-bearing structure that fits the outer dimensions of the liner perfectly is a wound fiber composite material, or a metal pressure vessel with an inner dimension that is basically the same as the outer dimension of the liner is manufactured, and then the liner and the pressure vessel are filled with cured resin. Regardless of the method, a specific external pressure-bearing shell needs to be manufactured for a specific liner, which returns to the direct manufacture of hydrogen storage bottles. For example, patent 202410417856.2 provides a multi-stage pressure hydrogen permeation test equipment and method for the liner of a type IV hydrogen storage container, and describes a method for detecting the permeability of liner structures of different structures, which is of great significance for liner permeation detection under low-pressure conditions. However, the outer protective device of the liner in this design still requires special manufacturing for a specific liner structure, and the protective device cannot withstand higher pressures. If the protective device is required to withstand higher pressures, it needs to be designed according to the carbon fiber layer, which also returns to the manufacturing of the entire hydrogen storage bottle, which has high requirements for cost and R&D time. The alternative detection method corresponding to the pressure-bearing structure that is completely covered with the outer dimensions of the liner is the current high-pressure penetration detection equipment for liner materials. When testing the liner material, ceramic or metal components that can withstand pressure need to be placed on the low-pressure side to prevent the liner material from undergoing large deformation.

[0007] There is no clear method and equipment for balancing the internal and external gas or liquid pressures in terms of high-pressure detection equipment and processes. In addition, the greater difficulty lies in how to achieve the output of the inner tank stress and strain detection signal under high-pressure closed conditions, which needs to be solved urgently. Summary of the invention

[0008] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides a high-pressure performance testing equipment and testing method for the inner liner of a hydrogen storage bottle. The present invention can directly detect the service performance of a non-pressure-bearing inner liner under high-pressure conditions by applying high pressure inside and outside the inner liner at the same time, controlling the temperature of the pressure medium, and controlling the axial movement of the BOSS structure on the right side of the inner liner with the size of the medium pressure; further, by manufacturing a recyclable, easy-to-process, non-pressure-bearing hard shell on the outside of the inner liner, the deformation of the inner liner during the test can be controlled to be consistent with the deformation of the inner liner in the hydrogen storage bottle at low cost and high efficiency; more importantly, in view of the difficulty in wired detection of the deformation of the inner liner under high-pressure conditions, a high-pressure-resistant signal line interface structure and related extension structures are designed to realize wired signal transmission between high pressure and low pressure.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] The overall equipment scheme of the equipment and method for testing the high-pressure resistance performance of the inner liner of a hydrogen storage bottle of the present invention includes a barrel-shaped high-pressure container for accommodating the inner liner and having a shape adapted to the inner liner, a bottle valve is coaxially sealed and plugged at the bottle mouth of the front end of the high-pressure container; a BOSS displacement control system is installed at the tail end of the high-pressure container and can be telescopically pressed against the tail of the inner liner to seal the front end of the bottle valve into the bottle mouth of the inner liner; a pressure control system is also arranged at the bottle valve, which can add the same pressure to the high-pressure container and the inner liner respectively, as well as a high-pressure resistant signal line interface structure and related extension structures for wired signal transmission from the high pressure side to the low pressure side; a strain detection component for detecting the deformation of the inner liner is also arranged at the inner liner to be tested.

[0011] The equipment and method for testing the high-pressure performance of the inner liner of a hydrogen storage bottle of the present invention specifically include a high-pressure container, a BOSS displacement control system, a pressure control system, a temperature control system, a concentration detection device, and a safety system. The high-pressure container is a high-pressure explosion-proof container made by winding metal or composite materials; the BOSS displacement control system includes a BOSS fixed structure, a BOSS axial displacement control structure, a BOSS radial displacement control structure, etc.; the pressure control system includes a pressure medium, an external pressure control device, an internal pressure control device, an internal and external pressure difference control device, a bottle valve, a safety release device, etc.; the temperature control system includes a high-pressure container temperature control system, a pressure medium temperature control system, and a rapid heat exchange structure; the concentration detection device includes a hydrogen concentration detector, a data acquisition device, etc.

[0012] The component connection relationship of a high-pressure performance testing equipment and a testing method for the inner liner of a hydrogen storage bottle of the present invention is as follows: the various components of the high-pressure container are connected by flanges, the flanges are sealed by sealing rings or sealing gaskets, and are positioned by a positioning structure. The high-pressure container always remains sealed during service. The high-pressure container is coated with a high-pressure container heating and cooling system on the outside, which is used to control the temperature of the high-pressure container and the temperature of the internal pressure medium. The heating and cooling structure is coated with an insulating layer on the outside. The inner liner is installed in the high-pressure container for testing. The axis position of the head of the high-pressure container is respectively provided with inner holes for installing a bottle valve and a BOSS displacement rod. The BOSS displacement rod is installed at the axis position of the right side of the head of the high-pressure container. The cylindrical surface of the BOSS displacement rod is sealed with the high-pressure container by a sealing ring, and can slide and axially displace relative to the high-pressure container. The part of the BOSS displacement rod exposed from the high-pressure container is connected to a linear motor, and the axial displacement of the BOSS displacement rod is controlled by a control system. A hydrogen concentration sensor is installed at the outlet of the BOSS displacement rod and the high-pressure container for monitoring leakage. The inside of the BOSS displacement rod is fixedly connected to the BOSS support rod by threads. The BOSS support rod is used to support the inner liner and is fixedly connected to the BOSS structure of the inner liner; the BOSS support rod is slidably connected to the high-pressure container through a polygonal cylinder. A bottle valve is installed at the axial position of the left end cap of the high-pressure container. The bottle valve is fixedly connected to the left BOSS of the inner liner through threads. After the fixing is completed, the bottle valve is fixedly connected to the high-pressure container through bolts; the bottle valve and the high-pressure container are sealed by a sealing ring. A pipeline connected to the inner liner is provided at the axial position on the bottle valve, and is sealed with the inner liner through a sealing structure during actual use; high-pressure container ventilation pipelines and concentration detection pipelines for ventilating the inside of the high-pressure container are respectively provided at other positions of the bottle valve. In addition, a signal line pipeline is designed for installing signal lines. A vacuum device is provided at the outer end face of the bottle valve to prevent gas leakage at the bottle mouth from causing danger.

[0013] The external lines and pipelines corresponding to the bottle valve are:

[0014] A positioning ring is coaxially fixed at the tail end of the bottle valve, and a plurality of guide holes are uniformly opened on the positioning ring in sequence around the circumference of the positioning ring, and the axial direction of each guide hole is parallel to the axial direction of the bottle valve; a plurality of threaded holes are opened in sequence on the front end surface of the high-pressure container around the circumference of the bottle mouth, and each locking bolt passes through the corresponding guide hole and is threadedly connected with the threaded hole to seal the bottle valve at the bottle mouth of the high-pressure container. The pressure control system includes an inner tank hydrogenation / liquid compressor connected to the axial center hole of the bottle valve through a pressurized hose, and an inner tank pressurization stop valve, an inner tank stop valve and a first pressure gauge are sequentially connected and arranged between the inner tank hydrogenation / liquid compressor and the bottle valve along the pressurization direction of the inner tank. The inner tank pressurization stop valve, the inner tank stop valve and the pressure gauge constitute an inner tank pipeline, and a vacuum pump is also connected and arranged at the inlet end of the inner tank pipeline, and an inner tank exhaust stop valve is installed between the vacuum pump and the inlet end. A high-pressure container ventilation pipeline connecting the inside and outside of the high-pressure container is also provided on the bottle valve, and the inner tank pressurization stop valve and the high-pressure container ventilation pipeline are connected to each other; and along the air inlet direction of the high-pressure container, a high-pressure container pressure reducing valve and a high-pressure container stop valve are sequentially connected and arranged between the inner tank pressurization stop valve and the high-pressure container ventilation pipeline; an external medium compressor is also connected and arranged at the inlet of the high-pressure container ventilation pipeline; and along the air inlet direction of the high-pressure container, a high-pressure container external medium stop valve and a second pressure gauge are sequentially connected and arranged between the external medium compressor and the high-pressure container ventilation pipeline. A concentration detection pipeline connecting the inside and outside of the high-pressure container is also provided on the bottle valve, and a mass spectrometer is connected and arranged at the inlet end of the concentration detection pipeline; along the flow direction of the gas to the mass spectrometer, a detection stop valve, a detection pressure reducing valve and a third pressure gauge are sequentially connected and arranged between the concentration detection pipeline and the mass spectrometer. The bottle valve is also provided with a signal line pipeline connecting the inside and outside of the high-pressure container. A transmission line is sealed through the signal line pipeline. One end of the transmission line is connected to a strain gauge attached to the surface of the inner tank, and the other end of the transmission line passes through the bottle valve and is connected to a strain processor.

[0015] The stop valves and branch pipelines on each pipeline described in the high-pressure resistance performance testing equipment and testing method for the inner liner of a hydrogen storage bottle of the present invention can be replaced by a combination of reversing valves and the like.

[0016] The high-pressure container ventilation pipeline and concentration detection pipeline on the bottle valve of the present invention can be connected to a hose or a metal pipe through a pipeline quick connector, and the other end of the hose or the metal pipe can be placed at a target inflation and degassing position in the high-pressure container.

[0017] The shape of the high-pressure container of the present invention is preferably compatible with the shape of the inner liner. In addition, the high-pressure container is preferably manufactured and used in batches according to the size of the inner liner to be tested, for example, for small and micro hydrogen storage bottle inner liners with a volume of less than 60L used in aircraft, etc., small and micro high-pressure containers are manufactured; for hydrogen storage bottle inner liners with a volume of 60L-210L used in passenger cars, corresponding small high-pressure containers are manufactured; for hydrogen storage bottle inner liners with a volume of more than 210L used in commercial vehicles, etc., corresponding large high-pressure containers are manufactured.

[0018] The high-pressure container is preferably manufactured in one piece, and if necessary, a reinforcing rib may be provided on the outside; the head and the cylinder are connected by a flange. Alternatively, the cylinder of the high-pressure container is manufactured in sections to cope with liner of different lengths. In addition, the outside of the high-pressure container may be wrapped with fiber material to increase strength.

[0019] The heating and cooling structure of the present invention is a conventional heating jacket and cooling jacket structure, and the structure is not specifically limited, but preferably explosion-proof treatment is performed. The heating jacket is, for example, an infrared heating jacket, a ceramic heating jacket, etc., and the cooling jacket is, for example, a cooling copper tube, a liquid nitrogen cooling jacket, etc.

[0020] The position for pasting the strain gauge in the present invention can be selected inside the inner liner (if feasible) or outside the inner liner. The signal line of the strain gauge in the inner liner or high-pressure container is connected with the external signal line through the innovative high-voltage signal line interface structure of the present invention.

[0021] As shown in the detail diagram, the sealing method of the high-pressure resistant sealed signal line connector structure of the present invention adopts sealing means such as conical sealing and labyrinth sealing. Taking a representative structure as an example, from the outside to the inside of the high-pressure pipeline (or high-pressure valve), they are respectively a signal line fixing plug, a gasket, a polymer female connector, a polymer male connector, and a high-pressure pipeline (or high-pressure valve). The signal line fixing plug is connected to the high-pressure pipeline by a thread and sealed with an end face sealing ring. The signal line fixed in the polymer male connector can be inserted into the signal line fixed by the polymer female connector. Under high pressure conditions, the polymer material is compressed and the sealing performance is improved. In addition, since the polymer material cannot directly withstand a high pressure difference, the signal line pipeline should be as small as possible, and a gasket should be used on the low-pressure side. The gasket is preferably made of ceramic or metal material, and the gasket and the signal line are isolated by an insulating material.

[0022] The interface between the polymer material female connector and the polymer material male connector uses interference fit. In the mating position of the female connector and the male connector, preferably, as shown in the detail diagram, the female connector is suspended inside and outside to prevent the high pressure from causing deformation of the female connector and affecting signal transmission.

[0023] The polymer female connector and the polymer male connector of the present invention are preferably formed by high pressure forming methods such as injection molding or compression molding to improve the density of the material. Preferably, the polymer material on the polymer female connector and the polymer male connector can be an elastic material such as a rubber material or a nylon elastomer material. Alternatively, in the bottle valve signal line pipeline, a reactive nylon elastomer can be injected for sealing. The nylon elastomer is manufactured by reaction molding or injection molding. After molding, the elastomer will shrink and tightly wrap the wire tube, and will be compressed under high pressure conditions. In addition, the longer sealing path can also improve the sealing performance and reduce leakage.

[0024] In the present invention, when there are many signal lines, the bottle valve signal line pipeline can also use an external signal line pipeline to prevent the cross-sectional area of ​​the polymer material female connector and the polymer material male connector from being too large, which may cause sealing failure. In addition, the use of the external signal line pipeline can realize the control of the internal pressure of the high-pressure container or the inner tank while obtaining the detection data.

[0025] The detection method of the present invention uses the above-mentioned high pressure resistance performance detection equipment of the hydrogen storage bottle liner, and includes the following basic steps:

[0026] Step 1: Place the inner liner in the high-pressure container, then assemble the segmented high-pressure container together, and seal the bottle valve at the bottle mouth of the high-pressure container, and connect all the pipes on the bottle valve; then attach each strain gauge to the outer surface of the inner liner according to the set requirements; then start the linear motor to make the BOSS support rod press against the tail end of the inner liner, so that the bottle valve and the inner liner form a sealed fit;

[0027] Step 2: Determine whether it is necessary to clean the air in the high-pressure container and the inner tank according to the specific test requirements; if necessary, first open the high-pressure container stop valve, the inner tank exhaust stop valve and the vacuum pump to extract the air in the high-pressure container and make it in a vacuum state; then close the high-pressure container stop valve, and open the inner tank stop valve to extract the air in the inner tank and make it in a vacuum state; finally, close the inner tank stop valve, the inner tank exhaust stop valve and the vacuum pump;

[0028] Step 3: Conduct service pressure test, leakage test, and ambient temperature cracking test of the liner; when conducting the service pressure test of the liner, first open the liner hydrogenation / liquid compressor, liner stop valve, liner pressurization stop valve, and high-pressure container stop valve in sequence, and fill the test medium into the liner and high-pressure container through the hydrogenation / liquid compressor. After reaching the set pressure, maintain the pressure for a certain period of time, and detect the deformation of the liner according to the feedback of the strain gauge as required; after the service pressure test of the liner is completed, close the liner pressurization stop valve, and open the liner exhaust stop valve to release the pressure; after the pressure is released, take out the liner, and detect the changes in the apparent performance and mechanical properties of the liner as required. After reaching the set pressure in the service pressure test of the liner, maintain the pressure for a certain period of time, and then conduct a leakage test; when conducting a leakage test, first open the external medium stop valve of the high-pressure container, and then fill the high-pressure container with nitrogen or inert gas through the external medium compressor; at the same time, open the detection stop valve to reduce the pressure of the mixed gas in the high-pressure container and enter the mass spectrometer, and analyze the hydrogen content in the mixed gas in the mass spectrometer. During the service pressure test and leak test of the liner, the gas entering the liner and the high-pressure vessel is heated or cooled depending on the test conditions.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention can directly detect the service performance of a non-pressure-bearing liner under high-pressure conditions by applying high pressure inside and outside the liner at the same time, controlling the temperature of the pressure medium, and controlling the axial movement of the BOSS structure on the right side of the liner according to the medium pressure.

[0031] 2. In view of the difficulty in wired detection of inner tank deformation under high-voltage conditions, a high-voltage resistant signal line interface structure and related extension structures are designed to realize wired signal transmission between high voltage and low voltage.

[0032] 3. By manufacturing a recyclable, easy-to-process, non-pressure-bearing hard shell on the outside of the inner liner, the deformation of the inner liner during testing is controlled to be consistent with the deformation of the inner liner in the hydrogen storage bottle at low cost and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a schematic diagram of the principle structure of a hydrogen storage bottle inner liner high pressure resistance performance testing device.

[0034] Figure 2 It is a detailed schematic diagram of the bottle valve of the present invention.

[0035] Figure 3 This is a schematic diagram of the installation of the alternative inner liner and high-pressure container described in the present invention.

[0036] Figure 4 This is a schematic diagram of filling epoxy resin or the like into the gap between the inner liner and the high-pressure container according to the present invention.

[0037] Figure 5 This is a schematic diagram of an alternative structure in which epoxy resin or the like is filled into the gap between the inner liner and the high-pressure container according to the present invention.

[0038] Figure 6 This is a schematic diagram of the structure of the high-pressure resistant sealed signal line connector of the present invention.

[0039] Figure 7 This is a schematic diagram of an alternative structure of the high-pressure resistant sealed signal line connector structure of the present invention.

[0040] Figure 8 This is a schematic diagram of the external signal line pipeline of the present invention.

[0041] 1-high pressure vessel; 2-high pressure vessel heating and cooling structure; 3-high pressure vessel insulation layer; 4-inner liner; 401-BOSS structure on the left side of the inner liner; 402-BOSS structure on the right side of the inner liner; 5-BOSS support rod; 6-BOSS displacement rod; 7-hydrogen concentration sensor; 8-linear motor; 9-hard shell; 11-strain gauge; 12-bottle valve; 1201-high pressure vessel ventilation pipeline; 1202-concentration detection pipeline; 1203-signal line pipeline; 1204-external signal line pipeline; 12041-connecting seat; 120411-threaded head; 13-pipeline quick connector; 14-hose / metal pipe; 15-high pressure resistant sealed signal line connector structure; 1501-polymer material male connector; 1502-polymer material female connector; 15021-alternative high Molecular material female connector; 1503-gasket; 1504-signal line fixing plug; 15041-signal line fixing plug outer plug; 15042-signal line fixing plug inner plug; 15043-screw; 16-vacuum device; 17-strain processor; 18-first pressure gauge; 19-inner tank stop valve; 20-inner tank pressurization stop valve; 21-inner tank hydrogenation / liquid compressor; 22-inner tank medium heating and cooling system; 23-high-pressure vessel pressure reducing valve; 24-high-pressure vessel stop valve; 25-inner tank air extraction stop valve; 26-vacuum pump; 27-high-pressure vessel medium heating and cooling system; 28-second pressure gauge; 29-high-pressure vessel external medium stop valve; 30-external medium compressor; 31-detection stop valve; 32-detection pressure reducing valve; 33-third pressure gauge; 34-mass spectrometer. Specific implementation plan

[0042] 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.

[0043] like Figure 1 As shown, a kind of equipment and method for testing the high-pressure performance of the inner liner of a hydrogen storage bottle includes a high-pressure container, a BOSS displacement control system, a pressure control system, a temperature control system, a concentration detection system, a strain monitoring system, and a safety system. The high-pressure container 1 is a high-pressure explosion-proof container made of metal or composite material winding. The BOSS displacement control system includes a BOSS support rod 5, a BOSS displacement rod 6, a linear motor 8, a displacement control device, etc. The pressure control system includes a bottle valve 12, a pressure medium, an external medium compressor 30, a vacuum pump 26, a detection pressure reducing valve 32, a pressure gauge, a safety relief device, etc. The temperature control system includes a high-pressure container temperature control system, a pressure medium temperature control system, etc. The concentration detection device includes a mass spectrometer 34, a pressure reducing valve, a pressure gauge, a stop valve, a quick connector, a pipeline quick connector, a hose / metal pipe 14, etc. The strain monitoring system includes a strain gauge 11, a high-pressure sealed signal line connector structure 15, a signal line, an external signal line pipeline, a strain processor 17, etc. The safety system is a necessary safety protection structure or device to prevent high-pressure containers, hydrogen, etc. from causing harm to operators.

[0044] The equipment connection relationship of the high-pressure performance testing equipment and the testing method of the inner liner of a hydrogen storage bottle of the present invention is as follows: in order to facilitate the installation of the inner liner 4, a multi-section component unit is set on the high-pressure container 1, and each component unit is connected by a flange, and the flange is sealed by a sealing ring or a sealing gasket, and is positioned and coaxially connected to each other through the holes on the flange. The high-pressure container 1 always remains in a sealed state when in service. The high-pressure container 1 is coated with a high-pressure container heating and cooling structure 2 on the outside, which is used to control the temperature of the high-pressure container 1 and the temperature of the internal pressure medium. The heating and cooling structure 2 is coated with an insulation layer 3 on the outside, which is used to perform insulation treatment on the high-pressure container 1. The inner liner 4 is installed in the high-pressure container 1 for testing. The inner holes for installing the bottle valve 12 and the BOSS displacement rod 6 are respectively designed at the axis position of the head of the high-pressure container 1. The BOSS displacement rod 6 is installed at the axis position of the right end of the high-pressure container 1. The cylindrical surface of the BOSS displacement rod 6 is sealed with the high-pressure container 1 by a sealing ring, and can rotate relative to the high-pressure container 1 and slide axially. The part of the BOSS displacement rod 6 exposed from the high-pressure container 1 is connected to the linear motor 8, and the axial displacement of the BOSS displacement rod 6 is controlled by the control system. A hydrogen concentration sensor 7 is installed at the BOSS displacement rod 6 and the outlet of the high-pressure container 1 for monitoring leakage. The inside of the BOSS displacement rod 6 is fixedly connected to the BOSS support rod 5 by threads. The BOSS support rod 5 is used to support the inner liner 4, and is coaxially fixedly connected to the positioning hole on the BOSS structure 402 on the right side of the inner liner; the BOSS support rod 5 is connected to the high-pressure container 1 by a polygonal cylinder. A bottle valve 12 is installed at the axis position of the left end cap of the high-pressure container 1. The bottle valve 12 is fixedly connected to the BOSS structure 401 on the left side of the inner liner by threads. After the fixing is completed, the bottle valve 12 is fixedly connected to the high-pressure container 1 by bolts and flanges; the bottle valve 12 and the high-pressure container 1 are sealed by a sealing ring. A pipeline connected to the inner liner 4 is provided at the axis position on the bottle valve 12, and is sealed with the inner liner 4 by a sealing structure during actual use; high-pressure container ventilation pipelines 1201 and concentration detection pipelines 1202 for ventilating the inside of the high-pressure container 1 are respectively provided at other positions of the bottle valve 12. In addition, a signal line pipeline 1203 for installing signal lines is designed. An air extraction device 16 is provided at the outer end surface of the bottle valve 12 to prevent the gas leaking from the bottle mouth from causing danger.

[0045] like Figure 2As shown, the external circuits and pipelines at the corresponding positions of the bottle valve 12 are respectively: the signal line pipeline 1203 on the bottle valve 12 is connected to the strain gauge 11 and the like inside, and is connected to the strain processor 17 outside. The pipeline on the bottle valve 12 that is connected to the inside of the inner tank 4 is connected to the first pressure gauge 18, the inner tank stop valve 19, the inner tank pressurization stop valve 20, and the inner tank hydrogenation / liquid compressor 21 respectively starting from the bottle valve 12. Among them, the inner tank medium heating and cooling system 22 is installed on the pipeline between the first pressure gauge 18 and the bottle valve 12, which is mainly used to control the temperature of the medium entering the inner tank. The inner tank stop valve 19 and the inner tank pressurization stop valve 20 are connected to the inner tank exhaust stop valve 25 and the vacuum pump 26 through a branch pipeline. In addition, the inner tank stop valve 19 and the inner tank pressurization stop valve 20 are connected to the high-pressure container ventilation pipeline 1201 on the bottle valve 12 through a branch pipeline, a high-pressure container pressure reducing valve 23, and a high-pressure container stop valve 24. A high-pressure container medium heating and cooling system 27 is installed on the pipeline between the high-pressure container stop valve 24 and the bottle valve 12. A second pressure gauge 28, a high-pressure container external medium stop valve 29, and an external medium compressor 30 are connected to the pipeline between the high-pressure container stop valve 24 and the high-pressure container medium heating and cooling system 27 through a branch pipeline. The concentration detection pipeline 1202 on the bottle valve 12 is externally connected to a detection stop valve 31, a detection pressure reducing valve 32, a third pressure gauge 33, and a mass spectrometer 34.

[0046] The detection method of the present invention comprises the following steps:

[0047] In the first step, the inner liner 4 is connected to the bottle valve 12, and the bottle valve 12 is fixed on the pressure vessel 1; the other end of the inner liner 4 is connected through the BOSS support rod 5 of the inner liner 4, and connected and sealed with the BOSS displacement rod 6. In addition, if it is necessary to attach a strain gauge 11 to the inner liner, the strain gauge 11 and other testing materials should be attached to the position to be tested at this time, and the relevant signal line is connected to the outside through the signal line pipeline 1203 on the bottle valve.

[0048] The second step is to check that the connection of the inner liner 4 in the high-pressure container 1 is correct, seal the high-pressure container 1, and check the sealing performance. The BOSS displacement rod 6 can control the displacement of the BOSS structure 402 on the right side of the inner liner according to the pressure inside the inner liner 4 under the drive of the linear motor 8 to achieve the same displacement as the actual hydrogen storage bottle when pressurized.

[0049] The third step is to clean up impurities. First, determine whether it is necessary to clean up the air in the high-pressure container 1 and the inner liner 4 according to the specific test requirements. If necessary, first open the high-pressure container stop valve 24, the inner liner exhaust stop valve 25, and the vacuum pump 26 to evacuate the high-pressure container 1. After the end, close the high-pressure container stop valve 24, open the inner liner stop valve 19, and evacuate the inner liner 4. After the high-pressure container 1 and the inner liner 4 are evacuated, close the inner liner stop valve 19, the inner liner exhaust stop valve 25, and the vacuum pump 26.

[0050] The fourth step is service pressure test, leakage test, and ambient temperature cracking test. The basic pressurization operations of the three tests are consistent; the medium temperature is controlled according to demand through the inner liner medium heating and cooling system 22, the high-pressure container medium heating and cooling system 27, and the high-pressure container heating and cooling structure 2. When the inner liner 4 is pressurized, the high-pressure container 1 also needs to be pressurized simultaneously. At the same time, the internal and external pressure difference required for the inner liner 4 to undergo the same deformation can be calculated based on the general deformation of the hydrogen storage bottle under high pressure conditions, and the relevant parameters of the high-pressure container pressure reducing valve 23 can be set. In addition, when it is necessary to test the performance of the inner liner under large deformation conditions, the BOSS structure 402 on the right side of the inner liner can be controlled by the linear motor 8 to axially displace to match the actual situation based on the general axial strain of the hydrogen storage bottle.

[0051] When conducting hydraulic or hydrogen related tests, open the inner tank hydrogenation / liquid compressor 21, the inner tank shut-off valve 19, the inner tank pressurization shut-off valve 20, and the high-pressure container shut-off valve 24, and fill the test medium into the inner tank 4 and the high-pressure container 1 through the hydrogenation / liquid compressor 21. After reaching the set pressure, maintain the pressure for a certain period of time, and detect the deformation of the inner tank 4 as required. After the end, close the inner tank pressurization shut-off valve 20, and open the inner tank exhaust shut-off valve 25 to release the pressure; after the pressure is released, take out the inner tank 4, and detect the changes in the apparent performance and mechanical properties of the inner tank 4 as required.

[0052] When a leak test is required, unlike the above-mentioned hydraulic test, the high-pressure container stop valve 24 is not opened, but the high-pressure container external medium stop valve 29 is opened, and nitrogen or inert gas is filled into the high-pressure container 1 through the external medium compressor 30. In addition, during the detection process, nitrogen or other inert gas is continuously introduced into the high-pressure container through the high-pressure container ventilation pipeline 1201, and the detection stop valve 31 is opened, so that the mixed gas in the high-pressure container 1 is decompressed and enters the mass spectrometer 34 to analyze the hydrogen content in the mixed gas. Other operations are consistent with the above operations.

[0053] The fifth step is cycle test. Cycle test is a cyclic operation based on a single test of hydraulic pressure or hydrogen.

[0054] In the present invention, the inner liner 4 can directly use the developed inner liner, or only mold the target test position according to the target test position. Figure 3 As shown, when only the sealing performance and stress-strain of the inner liner 4 sealing structure and the metal-plastic connection structure under the ambient temperature and service pressure conditions are tested, and the influence of the overall structural change of the inner liner is not concerned, only the local related structure needs to be formed to carry out the test.

[0055] In the present invention, the inner liner 4 can be installed in the following ways: First, the inner liner 4 can be directly installed on the test device to test the strain, penetration, leakage and other behaviors of the inner liner 4 under pressure conditions. Second, after the inner liner 4 is covered with the hard shell 9, it can be more realistically tested and evaluated to more realistically test the deformation behavior, i.e., stress distribution, of the inner liner 4 when it is restricted by the outer material (simulating carbon fiber composite material) under high pressure conditions, thereby assisting in optimizing the structure of the inner liner 4. Third, further, when casting the hard shell 9, the inner liner 4 can be treated in the same way as carbon fiber curing to evaluate the strain behavior of the inner liner 4 during the curing process.

[0056] The external hard shell 9 of the present invention is preferably made of low melting point alloy or resin, and alternatively made of hard and easy-to-shape materials such as gypsum. The hard shell 9 cannot withstand high pressure. The manufacturing method of the hard shell 9 is: select a suitable thickness as the thickness of the hard shell 9. Preferably, the hard foam is cut out of the shape of the hard shell 9 as an outer mold, and the dimensional accuracy is set according to the test requirements. The hard foam is coated on the outside of the inner liner 4, and a certain pressure of gas is filled into the inner liner 4 so that the inner liner 4 can be used as an inner mold. Resin or low melting point alloy is poured between the inner liner 4 and the hard foam, and the hard foam mold is removed after solidification or cooling. Among them, the hard foam is preferably designed as a split or segmented combination as a casting mold. That is, the hard foam is designed as two petals along the axis of the inner liner, or segmented as a cylinder, head, etc. The advantage of the hard foam is that the model can be cut at will, the modeling time is short, and the cost is low. As an alternative, the outer mold can be made of sand mold or other materials.

[0057] Necessarily, if the pressure difference between the inside and outside of the inner liner 4 cannot be accurately controlled during the test, that is, the pressure inside the inner liner 4 and the pressure inside the high-pressure container 1 cannot be accurately controlled, a recyclable external hard shell 9 should be manufactured outside the inner liner 4.

[0058] Filling the inner and outer parts of the inner liner 4 with pressure medium at the same time may cause the high-pressure medium outside the inner liner 4 to enter the gap between the inner liner 4 and the BOSS structure 401 on the left side of the inner liner, thereby causing the actual pressure difference and leakage at the sealing position to be inconsistent with the hydrogen storage bottle. Therefore, in the present invention, as the preferred test scheme for the quality of the inner liner sealing structure: Figure 4 As shown, a high-pressure container 1 matching the structure of the inner liner 4 is manufactured, and on the basis of the original testing equipment, epoxy resin, paraffin or low-temperature alloy and other materials are poured into the gap between the inner liner 4 and the high-pressure container 1 from the circular hole opened on the bottle valve 12. After curing, a relatively close contact between the inner liner 4 and the high-pressure container 1 can be achieved. At this time, it is no longer necessary to pass the high-pressure medium outside the inner liner 4, and it is only necessary to pass the high-pressure medium into the inner liner 4 to test the sealing structure performance and other performances of the inner liner 4.

[0059] As a further alternative, if Figure 5As shown, the partial structure of the high-pressure container 1 on the right side of the inner shell can be manufactured as a structure without the BOSS displacement rod 6 placement hole.

[0060] The high-pressure container ventilation pipeline 1201 and the concentration detection pipeline 1202 on the bottle valve 12 of the present invention can be connected to the hose / metal pipe 14 through the pipeline quick connector 13, and the other end of the hose / metal pipe 14 can be placed at the target inflation and degassing position in the high-pressure container 1.

[0061] The location for pasting the strain gauge in the present invention can be selected inside the inner liner (if feasible) or outside the inner liner 4. The signal line of the strain gauge in the inner liner 4 or the high-pressure container 1 is connected to the external signal line through the innovative high-pressure resistant signal line connector structure 15 of the present invention.

[0062] like Figure 6 As shown, the sealing method of the high-pressure sealed signal line connector structure 15 of the present invention adopts sealing means such as conical sealing and labyrinth sealing. Using a representative structure to illustrate, from the outside to the inside of the high-pressure pipeline or high-pressure valve, they are respectively a signal line fixing plug 1504, a gasket 1503, a polymer material female connector 1502, a polymer material male connector 1501, and a high-pressure pipeline or a high-pressure valve. The signal line fixing plug 1504 is connected to the high-pressure pipeline by a thread and sealed with an end face sealing ring. The signal line fixed in the polymer material male connector 1501 can be inserted into the signal line fixed by the polymer material female connector 1502. Under high pressure conditions, the polymer material is compressed and the sealing performance is improved. In addition, since the polymer material cannot directly withstand a high pressure difference, the signal line pipeline 1203 should be as small as possible, and a gasket 1503 should be used on the low-pressure side. The gasket 1503 is preferably made of ceramic or metal material, and the gasket 1503 is isolated from the signal line by an insulating material.

[0063] The interface between the polymer material female connector 1502 and the polymer material male connector 1501 uses an interference fit. At the mating position of the female connector 1502 and the male connector 1501, preferably, as shown in the detail diagram, the female connector is suspended inside and outside to prevent the high pressure from causing the female connector to deform and affect signal transmission. The polymer material female connector 1502 and the polymer material male connector 1501 are preferably formed by high pressure molding methods such as injection molding or compression molding to improve the density of the material. The polymer material on the polymer material female connector 1502 and the polymer material male connector 1501 can be selected from elastic materials such as rubber materials or nylon elastomer materials. Alternatively, in the signal line pipeline 1203 of the bottle valve 12, a reactive nylon elastomer can be injected for sealing. Nylon elastomers are manufactured by reaction molding or injection molding. After molding, the elastomer will shrink and tightly wrap the wire tube, and will be compressed under high pressure conditions. In addition, a longer sealing path can also improve the sealing performance and reduce leakage.

[0064] As an alternative structural solution of the high-pressure resistant sealed signal line connector structure 15, Figure 7 As shown, the original signal line fixing plug 15 is split into a signal line fixing plug outer plug 15041 and a signal line fixing plug inner plug 15042, and the alternative polymer material female connector 15021 is locked and compacted by screws 15043. The alternative polymer material female connector 15021 is formed by injection molding or the like, wherein the polymer material is an elastomeric material, and the metal signal line is coated with an insulating coating on the outside to achieve gas sealing and signal insulation. As an alternative, the two signal lines on the strain gauge can use the high-voltage sealed signal line connector structure 15 respectively without being integrated on the same connector structure.

[0065] In the present invention, when there are many signal lines, such as Figure 8 As shown, the bottle valve signal line pipeline 1203 can also use an external signal line pipeline 1204 to prevent the cross-sectional area of ​​the polymer material female connector 1502 and the polymer material male connector 1501 from being too large, resulting in sealing failure. In addition, the use of the external signal line pipeline 1204 can achieve control of the internal pressure of the high-pressure container 1 or the inner tank 4 while obtaining detection data. The external signal line pipeline 1204 includes a connecting seat 12041 that can be connected to the signal line pipeline 1203 on the bottle valve 12, and multiple signal line pipelines 1203 can be connected to the connecting seat at the same time, thereby realizing the simultaneous transmission of multiple signals. The connecting seat 12041 is threadedly sealed with each other through the external thread head 120411 at the bottom thereof and the through hole where the original signal line pipeline 1203 is located on the bottle valve 12, so that the connecting seat 12041 is fixedly installed on the bottle valve 12. Then, each signal line pipeline 1203 on the connecting base 12041 passes through the through hole in the connecting base 12041 to extend into the interior of the high-pressure container 1, thereby realizing signal transmission.

[0066] The hydrogen storage bottle liner of the present invention is not limited to the storage and transportation of hydrogen, but is also applicable to other high-pressure gas storage fields such as oxygen, helium, argon, etc.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high pressure performance testing equipment for the inner liner of a hydrogen storage bottle, characterized by: It includes a high-pressure container, a BOSS displacement control system, a pressure control system, a temperature control system, a concentration detection device, and a safety system; the high-pressure container is a high-pressure explosion-proof container made of metal or composite material winding, and the various components of the high-pressure container are connected by flanges, which are sealed by sealing rings or sealing gaskets and positioned by positioning structures; the high-pressure container always remains sealed during service; the high-pressure container is coated with a high-pressure container heating and cooling system on the outside to control the temperature of the high-pressure container and the temperature of the internal pressure medium; the heating and cooling system is coated with an insulation layer on the outside; the liner is installed in the high-pressure container for detection; the axis position of the head of the high-pressure container is respectively provided with inner holes for installing a bottle valve and a BOSS displacement rod; the axis position of the head on the right side of the high-pressure container is installed with a BOSS displacement rod; the cylindrical surface of the BOSS displacement rod is sealed with the high-pressure container by a sealing ring, and can slide and axially displace relative to the high-pressure container; the part of the BOSS displacement rod exposed from the high-pressure container is connected to a linear motor, and the axial displacement of the BOSS displacement rod is controlled by the control system; BOSS A hydrogen concentration sensor is installed at the S displacement rod and the outlet of the high-pressure container for monitoring leakage; the inside of the BOSS displacement rod is fixedly connected to the BOSS support rod by threads; the BOSS support rod is used to support the inner liner and is fixedly connected to the BOSS structure of the inner liner; the BOSS support rod is slidably connected to the high-pressure container through a polygonal cylinder; a bottle valve is installed at the axis position of the left head of the high-pressure container; the bottle valve is fixedly connected to the left BOSS of the inner liner by threads, and after the fixing is completed, the bottle valve is fixedly connected to the high-pressure container by bolts; the bottle valve and the high-pressure container are sealed by a sealing ring; a pipeline connected to the inner liner is provided at the axis position on the bottle valve, and is sealed with the inner liner by a sealing structure during actual use; high-pressure container ventilation pipelines and concentration detection pipelines for ventilating the interior of the high-pressure container are respectively provided at other positions of the bottle valve; a vacuum device is provided at the outer end face of the bottle valve; in addition, in view of the difficulty in wired detection of inner liner deformation under high-pressure conditions, a high-pressure resistant signal line interface structure and related extension structures are designed to realize wired signal transmission between high pressure and low pressure.

2. The inner container according to claim 1, characterized in that: The liner can be installed in the following ways: first, the liner can be directly installed on the test device to test the strain, penetration, leakage and other behaviors of the liner under pressure conditions; second, the liner can be covered with a hard shell to more realistically test and evaluate the deformation behavior, i.e., stress distribution, of the liner when restricted by the outer material (simulating carbon fiber composite materials) under high pressure conditions, thereby assisting in optimizing the liner structure; third, further, when casting the hard shell, the liner can be treated in the same way as carbon fiber curing to evaluate the strain behavior of the liner during the curing process.

3. The inner liner and high pressure container according to claim 1, characterized in that: When only the sealing performance and stress-strain of the liner sealing structure and the metal-plastic connection structure under ambient temperature and service pressure conditions are tested, and the influence of the overall structural changes of the liner is not concerned, it is only necessary to mold the local related structure of the liner and install it in the corresponding high-pressure container to carry out the test.

4. A high voltage resistant signal line interface structure, characterized in that: The sealing method of the high-pressure resistant sealed signal line connector structure adopts sealing means such as cone sealing and labyrinth sealing; taking a representative structure as an example, from the outside to the inside of the high-pressure pipeline (or high-pressure valve), they are respectively a signal line fixing plug, a gasket, a polymer material female connector, a polymer material male connector, and a high-pressure pipeline (or high-pressure valve); the signal line fixing plug is connected to the high-pressure pipeline through a thread and is sealed with an end face sealing ring; the signal line fixed in the polymer material male connector can be inserted into the signal line fixed in the polymer material female connector; under high pressure conditions, the polymer material is compressed and the sealing performance is improved; in addition, since the polymer material cannot directly withstand a high pressure difference, the signal line pipeline should be as small as possible , and a gasket should be used on the low-pressure side; the gasket is preferably made of ceramic or metal material, and the gasket and the signal line are isolated by insulating material; the interface between the polymer material female connector and the polymer material male connector uses interference fit; in the mating position of the female connector and the male connector, preferably, the female connector is suspended inside and outside to prevent the high pressure from causing deformation of the female connector and affecting signal transmission; in addition, the polymer material female connector and the polymer material male connector are preferably formed by high-pressure forming methods such as injection molding or molding; preferably, the polymer material can be selected from elastic materials such as rubber materials or nylon elastomer materials; alternatively, in the bottle valve signal line pipeline, a reactive nylon elastomer can be injected for sealing.

5. The extended structure of the high voltage resistant signal line interface structure according to claim 1, characterized in that: When there are many signal lines, the bottle valve signal line pipeline can also use an external signal line pipeline to prevent the sealing failure caused by the large cross-sectional area of ​​the polymer material female connector and the polymer material male connector.

6. The hard shell according to claim 2, characterized in that: The external hard shell is preferably made of low-melting-point alloy or resin, and alternatively made of hard and easy-to-shape materials such as gypsum. The hard outer shell cannot withstand high pressure; the manufacturing method of the hard shell is: select a suitable thickness as the thickness of the hard shell; preferably cut the shape of the hard shell from hard foam as an outer mold, and set the dimensional accuracy according to the test requirements; wrap the hard foam on the outside of the inner liner, and fill the inner liner with gas of a certain pressure so that the inner liner can be used as an inner mold; pour resin or low-melting-point alloy between the inner liner and the hard foam, and remove the hard foam mold after solidification or cooling; wherein, the hard foam is preferably designed as a petal-type or segmented combination as a casting mold; that is, the hard foam is designed as two petals along the axis of the inner liner, or segmented as a cylinder, a head, etc.; the advantage of the hard foam is that the model can be cut at will, the modeling time is short, and the cost is low; as an alternative, the outer mold can be made of sand mold or other materials.

7. The device according to claim 1, characterized in that: The high-pressure container ventilation pipeline and the concentration detection pipeline on the bottle valve can be connected to a hose or a metal tube through a pipeline quick connector, and the other end of the hose or the metal tube can be placed at a target inflation and degassing position in the high-pressure container.

8. The high pressure resistance performance testing equipment for the inner liner of a hydrogen storage bottle according to claim 7 is characterized by: By applying high pressure inside and outside the liner at the same time, controlling the temperature of the pressure medium, and controlling the axial movement of the BOSS structure on the right side of the liner according to the medium pressure, it is possible to directly detect the service performance of the non-pressure liner under high-pressure conditions.

9. A detection method, characterized in that: The following steps are involved: The first step is to connect the inner liner to the bottle valve and fix the bottle valve on the pressure vessel; the other end of the inner liner is connected through the inner liner support rod, and connected to the BOSS displacement rod and sealed; in addition, if strain gauges need to be attached to the inner liner, strain gauges and other testing materials should be attached at the position where testing is required, and the relevant signal lines are connected to the outside through the signal line pipeline on the bottle valve; The second step is to check that the connection of the inner tank in the high-pressure container is correct, seal the high-pressure container, and check the sealing performance; the BOSS displacement rod can control the displacement of the BOSS structure on the right side of the inner tank according to the pressure inside the inner tank under the drive of the linear motor to achieve the same displacement as the actual hydrogen storage bottle when pressurized; The third step is to clean up impurities. First, determine whether it is necessary to clean up the air in the high-pressure container and the inner tank according to the specific test requirements. If necessary, first open the high-pressure container stop valve, the inner tank exhaust stop valve, and the vacuum pump to evacuate the high-pressure container. After the end, close the high-pressure container stop valve, open the inner tank stop valve, and evacuate the inner tank. After the high-pressure container and the inner tank are evacuated, close the inner tank stop valve, the inner tank exhaust stop valve, and the vacuum pump. The fourth step is service pressure test, leakage test, and ambient temperature cracking test. The basic pressurization operations of the three tests are consistent. The medium temperature is controlled according to demand through the inner tank medium heating and cooling system, the high-pressure container medium heating and cooling system, and the high-pressure container heating and cooling structure. When pressurizing the inside of the inner tank, it is also necessary to pressurize the high-pressure container simultaneously. At the same time, the internal and external pressure difference required for the inner tank to undergo the same deformation can be calculated based on the general deformation of the hydrogen storage bottle under high pressure conditions, and the relevant parameters of the high-pressure container pressure reducing valve can be set. In addition, when the performance of the inner tank under large deformation conditions needs to be tested, the BOSS structure on the right side of the inner tank can be displaced in the axial direction by a linear motor to match the actual situation according to the general axial strain of the hydrogen storage bottle. When conducting hydraulic or hydrogen related tests, open the inner tank hydrogenation / liquid compressor, the inner tank shut-off valve, the inner tank pressurization shut-off valve, and the high-pressure container shut-off valve, and fill the test medium into the inner tank and the high-pressure container through the hydrogenation / liquid compressor. After reaching the set pressure, maintain the pressure for a certain period of time, and detect the deformation of the inner tank as required; after the end, close the inner tank pressurization shut-off valve, and open the inner tank exhaust shut-off valve to release the pressure; after the pressure is released, take out the inner tank, and detect the changes in the apparent performance and mechanical properties of the inner tank as required; When a leak test is required, unlike the above-mentioned hydraulic test, the high-pressure container stop valve is not opened, but the external medium stop valve of the high-pressure container is opened, and nitrogen or inert gas is filled into the high-pressure container through the external medium compressor; and, during the detection process, nitrogen or other inert gas is continuously introduced into the high-pressure container through the high-pressure container ventilation pipeline, and the detection stop valve is opened to reduce the pressure of the mixed gas in the high-pressure container and then enter the mass spectrometer to analyze the hydrogen content in the mixed gas; other operations are consistent with the above operations; The fifth step is cycle test; cycle test is a cyclic operation based on a single hydraulic or hydrogen test.

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