An internal hydrogen filling test apparatus and test method under high temperature and high pressure environment

Abstract

This invention relates to the field of hydrogen filling test technology, and discloses an internal hydrogen filling test device and test method under high temperature and high pressure environment. The invention adopts a scheme of internal hydrogen filling of hollow sample and rapid laser heating in combination, and cools both ends of the hollow sample to achieve cooling of the static sealing ring between the clamp and the connecting end, and the static sealing ring between the connecting end and the carrier tube. This ensures that the test device of the invention can accurately simulate the high temperature and high pressure hydrogen environment of hydrogen-related materials under near-service conditions, while avoiding the risk of hydrogen leakage, thereby improving test safety and result accuracy, and meeting the in-situ mechanical performance testing requirements of hydrogen-related components in hydrogen fuel aero engines under near-service conditions.

Description

Technical Field

[0001] This invention relates to the field of hydrogen filling test technology, and discloses an internal hydrogen filling test device and test method under high temperature and high pressure environment. Background Technology

[0002] To address the issues of hydrogen embrittlement and corrosion of hydrogen-related components in hydrogen-fueled aero-engines during long-term service in high-temperature, high-pressure hydrogen environments, existing hydrogen environment mechanical performance testing technologies mostly employ external hydrogen filling or hydrogen permeation techniques. External hydrogen filling technology requires placing hollow specimens and fixtures into a reactor / pressure vessel. This large reactor / pressure vessel isolates the specimen from the outside air, creating a relatively independent hydrogen environment. The hollow specimen or the fixtures at both ends extend to the outside of the reactor / pressure vessel and connect to a tensile testing machine. A dynamic seal is used between the hollow specimen or the fixtures at both ends and the reactor / pressure vessel. This device is complex in structure and cumbersome in operation, and can only simulate single test conditions of room temperature and high pressure (100℃ / 140 MPa) or simple coupled test conditions of high temperature and low pressure (900℃ / 3 MPa). It cannot simulate the coupled test conditions of high temperature (1100~1200℃), high pressure (4~6 MPa), and loading required for actual service conditions. Furthermore, conducting mechanical performance tests under high temperature and high pressure conditions carries a significant risk of hydrogen leakage, potentially even leading to deflagration. The electrochemical hydrogen charging process of hydrogen permeation technology is decoupled from the load loading process, and it cannot simulate the actual stress state of the test material under service environment. Summary of the Invention

[0003] The purpose of this invention is to provide an internal hydrogen filling test device and test method under high temperature and high pressure environment, which can accurately simulate the high temperature and high pressure hydrogen environment and improve test safety, so as to meet the in-situ mechanical performance test requirements of hydrogen-related components in hydrogen fuel aero engines under near-service conditions.

[0004] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows:

[0005] An internal hydrogen filling test device under high temperature and high pressure environment, comprising:

[0006] A hollow sample, comprising a support tube and a connecting end, wherein both ends of the support tube are threadedly connected to a connecting end, and the connecting end is provided with a hydrogen transport channel communicating with the support tube;

[0007] The loading device is equipped with a clamp for holding the connecting end of the hollow sample and applying a tensile load to the hollow sample; the clamp is equipped with a cooling component, which is connected to an external cooling device.

[0008] A gas filling device is connected to the hydrogen supply channel of the connection end and is used to fill the carrier tube with hydrogen through the hydrogen supply channel so that the hydrogen pressure in the carrier tube reaches a preset pressure.

[0009] A laser heating device is used to locally heat the support tube of the hollow sample to a preset temperature.

[0010] An environmental chamber, which is wrapped and fixed to the outside of the support tube of the hollow sample, is used to maintain the temperature of the support tube during the test.

[0011] Furthermore, the inner wall of the bearing tube is provided with a pre-fabricated notch.

[0012] Furthermore, the bearing pipe includes an upper bearing pipe and a lower bearing pipe, wherein the upper bearing pipe and the lower bearing pipe are bonded or welded together.

[0013] Furthermore, the bearing pipe includes at least two bearing sub-pipes of different materials, which are connected in series by threads.

[0014] Furthermore, the outer wall of the bearing tube is provided with a shoulder.

[0015] Furthermore, the loading device is characterized in that it is connected to the clamp via a universal joint, and the clamp is threadedly connected to the connecting end.

[0016] Furthermore, the gas filling device includes a nitrogen source, a hydrogen source, a pre-charged hydrogen mixing vessel, and a vacuum pump. The nitrogen source and the hydrogen source are both connected to the inlet of the pre-charged hydrogen mixing vessel. The outlet of the pre-charged hydrogen mixing vessel is connected to the hydrogen supply channel at one connection end of the hollow sample. The vacuum pump is connected to the hydrogen supply channel at the other connection end of the hollow sample.

[0017] Furthermore, the environmental chamber includes a chamber body and a lid connected by hinges, and both the chamber body and the lid are provided with a heat insulation layer and a heat preservation layer. The heat preservation layer is located inside the heat insulation layer and is provided with a heating element for maintaining the temperature of the carrier tube during the test.

[0018] A method for internal hydrogen filling testing under high temperature and high pressure conditions, based on the aforementioned internal hydrogen filling test device, includes:

[0019] The hollow sample is clamped on the fixture of the loading device, and an environmental chamber is installed on the hollow sample.

[0020] Connect the filling device to the hydrogen supply channel of the hollow sample and fill the hollow sample with hydrogen until the hydrogen pressure of the hollow sample reaches the preset pressure. Then separate the filling device from the hollow sample and seal the hydrogen supply channels at both ends of the hollow sample.

[0021] The hollow sample's support tube is locally heated to a preset temperature using a laser heating device, and the heating element of the environmental chamber is activated to heat the temperature inside the environmental chamber to a preset ambient temperature.

[0022] Start the loading device to conduct static strength test, creep test or fatigue test.

[0023] Compared with the prior art, the beneficial effects of this invention are:

[0024] This invention employs a combined approach of hydrogen filling and rapid laser heating within a hollow sample, and cools both ends of the hollow sample to achieve static sealing between the fixture and the connecting end, and between the connecting end and the carrier tube. This ensures that the test apparatus of this invention can accurately simulate the high-temperature and high-pressure hydrogen environment of hydrogen-related materials under near-service conditions, while avoiding the risk of hydrogen leakage. This improves test safety and result accuracy, and meets the in-situ mechanical performance testing requirements of hydrogen-related components in hydrogen fuel cell aero engines under near-service conditions. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal hydrogen filling test device under high temperature and high pressure environment in the embodiment;

[0026] Figure 2 This is a schematic diagram of the universal joint, clamp, and hollow sample in the embodiment;

[0027] Figure 3 This is a schematic diagram of the hollow sample and environmental chamber in the embodiment;

[0028] Figure 4 This is a schematic diagram of the insulation layer of the environmental chamber in the embodiment;

[0029] Figure 5 This is a cross-sectional view of the hollow sample in the embodiment;

[0030] Figure 6 This is a schematic diagram of the structure of a hollow sample with a pre-fabricated notch in the embodiment;

[0031] Figure 7 This is a schematic diagram of the hollow sample formed by bonding an upper and lower support tube in the embodiment.

[0032] Figure 8 This is a schematic diagram of the hollow specimen formed by welding an upper and lower support tube in the embodiment.

[0033] Figure 9 This is a schematic diagram of the structure of a hollow sample with a shoulder in the embodiment;

[0034] Figure 10This is a schematic diagram of the structure of the hollow specimen used for high-throughput static strength testing or high-throughput static fatigue testing in the embodiments.

[0035] Among them, 1-loading device, 11-clamp, 12-cooling component, 2-hollow sample, 21-bearing tube, 211-bearing upper tube, 212-bearing lower tube, 213-bearing branch tube, 214-shoulder, 22-connecting end, 221-hydrogen supply channel, 23-gas valve, 3-prefabricated notch, 4-environmental chamber, 41-chamber body, 42-chamber cover, 43-insulation layer, 44-thermal insulation layer, 45-mounting groove, 46-arc groove, 47-heating element, 48-observation window, 5-universal joint, 6-laser heating device, 71-nitrogen source, 72-hydrogen source, 73-pre-charged hydrogen mixing vessel, 74-vacuum pump, 75-pressure gauge, 76-switch valve, 8-control device, 9-cooling device. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0037] Most existing hydrogen environment mechanical performance testing schemes employ external hydrogen filling or hydrogen permeation techniques. External hydrogen filling requires placing a hollow sample and fixtures into a reaction vessel / pressure vessel, using the bulky vessel to isolate it from external air and create a relatively independent hydrogen environment. The hollow sample or the fixtures at both ends of the sample are dynamically sealed to the reaction vessel / pressure vessel. This method is complex and cumbersome, only capable of simulating single test conditions of room temperature and high pressure (100℃ / 140 MPa) or simple coupled test conditions of high temperature and low pressure (900℃ / 3 MPa). It cannot simulate the coupled test conditions of high temperature (1100~1200℃), high pressure (4~6 MPa), and loading required for actual service conditions. Furthermore, if existing testing schemes are used to conduct mechanical performance tests under high temperature and high pressure conditions, the dynamic sealing structure is prone to failure, posing a significant risk of hydrogen leakage and even deflagration. Therefore, this invention proposes an internal hydrogen filling test device for high temperature and high pressure environments. (See [link to relevant documentation]). Figures 1 to 10 The internal hydrogen charging test device includes:

[0038] Hollow sample 2, the hollow sample 2 includes a support tube 21 and a connecting end 22, the two ends of the support tube 21 are respectively threaded to a connecting end 22, and the connecting end 22 is provided with a hydrogen transport channel 221 communicating with the support tube 21;

[0039] The loading device 1 is a universal testing machine. The loading device 1 is equipped with a clamp 11, which clamps and applies a tensile load to the hollow specimen 2. The clamp 11 contains a cooling component 12, such as a cooling pipe, which is connected to an external cooling device 9, which can be a chiller. During testing, the cooling device 9 supplies cooling water to the cooling pipe to cool the connection end 22 between the clamp 11 and the hollow specimen 2. It should be noted that the clamp 11 can be manufactured using a lost-wax casting process to form the cooling pipe within the clamp 11, and then a cooling medium pipe can be connected to the inlet and outlet of the cooling pipe.

[0040] The gas filling device is connected to the hydrogen supply channel 221 of the connection end 22 via the gas valve 23, and is used to fill the carrier tube 21 with hydrogen through the hydrogen supply channel 221 so that the hydrogen pressure in the carrier tube 21 reaches a preset pressure.

[0041] Laser heating device 6, which is used to heat the support tube 21 of the hollow sample 2 to a preset temperature;

[0042] An environmental chamber 4 is provided, which is fixed to the outside of the support tube 21 of the hollow sample 2, and a heating element 47, such as a heating wire, is provided inside the environmental chamber 4 to maintain the temperature of the support tube 21 during the test.

[0043] This invention utilizes a gas filling device connected to the hydrogen supply channel 221 of the connecting end 22 in the hollow sample 2 to fill the carrier tube 21 with high-pressure hydrogen, bringing the hydrogen environment inside the carrier tube 21 to a preset pressure of 4-6 MPa. Simultaneously, a laser heating device 6 with fast response and high temperature control accuracy irradiates the carrier tube 21 inside the environmental chamber 4, locally heating it to the preset temperature of 1100-1200℃ required for the test. This invention employs a combined approach of hydrogen filling and rapid laser heating within the split-type hollow sample 2, and cools both ends of the hollow sample 2 to achieve cooling of the static sealing rings between the clamp 11 and the connecting end 22, and between the connecting end 22 and the carrier tube 21. This ensures that the test device of this invention can accurately simulate the high-temperature and high-pressure hydrogen environment of hydrogen-related materials under near-service conditions, while avoiding the risk of hydrogen leakage, thereby improving test safety and result accuracy, and meeting the in-situ mechanical performance testing requirements of hydrogen-related components in hydrogen fuel cell aircraft engines under near-service conditions.

[0044] This invention uses a hollow sample 2 filled with hydrogen as both the test object and a miniature pressure vessel. High-pressure hydrogen is introduced into the inner cavity of the hollow sample 2, eliminating the dependence on large reactors / pressure vessels. This avoids the risk of hydrogen leakage caused by the dynamic sealing between the hollow sample 2 and the reactor / pressure vessel, or between the clamps 11 at both ends of the hollow sample 2 and the reactor / pressure vessel, which is common in the prior art. It simplifies the structure and operation of the test device, reduces the requirements for hydrogen storage and flow rate, and improves the safety and reliability of the test process.

[0045] This invention employs laser heating technology to perform non-contact local heating of the support tube 21 of the hydrogen-filled hollow sample 2. Utilizing the high temperature control precision and fast response speed of laser heating, rapid and precise control of the local surface temperature field of the support tube 21 is achieved. Those skilled in the art can choose to heat the middle of the support tube 21 locally, or select the area requiring high-temperature testing. This invention utilizes the heating wire of the environmental chamber 4 to heat the temperature inside the chamber to 700-900℃ and maintain it, thereby reducing the temperature difference between the support tube 21 and its surrounding environment. This slows down the cooling rate of the support tube 21 during the test, ensuring that the temperature of the support tube 21 remains within the required test temperature range for a sufficient test time, thus facilitating the successful completion of the test.

[0046] It should be noted that, as Figures 2 to 5 Since the clamp 11 is threadedly connected to the connecting end 22 and the bearing pipe 21 is threadedly connected to the connecting end 22, a static sealing ring is provided at the connection between the clamp 11 and the connecting end 22, and a static sealing ring is also provided at the connection between the bearing pipe 21 and the connecting end 22 to prevent hydrogen leakage at the connection. However, during the test, the bearing pipe 21 will be locally heated to 1100~1200℃, and the environmental chamber 4 will form a high-temperature space of 700~900℃ outside the bearing pipe 21. Therefore, the static sealing rings at the connection between the clamp 11 and the connecting end 22, as well as the static sealing rings at the connection between the bearing pipe 21 and the connecting end 22, will bear high temperature loads. The present invention provides a cooling component 12 inside the clamp 11 to cool the static sealing rings between the clamp 11 and the connecting end 22 and between the connecting end 22 and the bearing pipe 21 using the principle of heat conduction, thereby extending the service life of the static sealing rings.

[0047] It should be noted that, as Figure 2 and Figure 3 The connecting end 22 is threadedly connected to the clamp 11 of the universal testing machine. When the universal testing machine clamps the hollow sample 2, the traditional rigid clamping structure is prone to extrusion deformation of the end of the hollow sample 2 due to excessive clamping force. The connecting end 22 of the present invention is threadedly connected to the clamp 11 of the universal testing machine, which can avoid the end of the hollow sample 2 being extruded and deformed, and ensure the accuracy of the test.

[0048] In some embodiments, the laser heating device 6 includes a high-power laser, an optical path transmission component, a focusing lens, and a temperature sensor. The high-power laser can be a fiber laser, and the optical path transmission component can be a high-temperature resistant optical fiber. The high-temperature resistant optical fiber can be installed in the environmental chamber 4 to guide the laser beam emitted by the fiber laser into the environmental chamber 4. The focusing lens is installed at the laser emission end of the high-temperature resistant optical fiber, i.e., inside the environmental chamber 4, to precisely focus the laser beam transmitted by the high-temperature optical fiber onto a local surface of the carrier tube 21 in the hollow sample 2. The temperature sensor can be an infrared thermometer, which can be installed inside the environmental chamber 4. The infrared thermometer monitors the surface temperature of the carrier tube 21 in real time and feeds the signal back to the control device 8. When the carrier tube 21 is locally heated to a preset temperature range, the control device 8 shuts down the laser heating device 6. If the test time is long, and the temperature of the locally heated area of ​​the carrier tube 21 falls below the lower limit of the preset temperature range, the control device 8, based on the feedback information from the infrared thermometer, restarts the laser heating device 6 to reheat the locally heated area of ​​the carrier tube 21, ensuring that the temperature of the locally heated area of ​​the carrier tube 21 remains within the preset temperature range. This invention uses a non-contact laser heating method, overcoming the limitations of traditional heating wires or infrared halogen lamps in terms of temperature field uniformity, control accuracy, and response speed. Especially under wide temperature ranges and complex working conditions, it can meet the needs of accurate testing of material mechanical properties.

[0049] In some embodiments, such as Figure 6 The inner wall of the support tube 21 is provided with a pre-fabricated notch 3. By setting the pre-fabricated notch 3, the initiation location of the crack can be precisely controlled, making the crack propagation process more controllable, thereby simulating the crack propagation behavior in a high-temperature and high-pressure hydrogen environment. Furthermore, the shape and size of the pre-fabricated notch 3 can be customized according to different experimental requirements to meet diverse experimental needs. It should be noted that during laser heating, the pre-fabricated notch 3 is selected as the local heating location of the support tube 21.

[0050] In some embodiments, such as Figure 7 and Figure 8 The supporting tube 21 includes an upper supporting tube 211 and a lower supporting tube 212. The upper supporting tube 211 and the lower supporting tube 212 are bonded, welded, or threaded together to allow for connection strength testing at the bonded, welded, or threaded joints under high temperature and high pressure hydrogen conditions. It should be noted that during laser heating, the connection point between the upper supporting tube 211 and the lower supporting tube 212 is selected as the local heating location of the supporting tube 21.

[0051] In some embodiments, such as Figure 9 The outer wall of the bearing tube 21 is provided with a shoulder 214. When the hollow sample 2 is subjected to creep test in a high temperature and high pressure hydrogen environment, the shoulder 214 provides a stable installation contact interface for the extensometer.

[0052] In some embodiments, such as Figure 10 The bearing tube 21 includes at least two bearing branch tubes 213 made of different materials. These bearing branch tubes 213 are connected in series via threads to enable high-throughput static strength testing or high-throughput fatigue testing of the hollow sample 2 under high-temperature and high-pressure hydrogen conditions, thereby improving testing efficiency. For example, as... Figure 10 Three different types of load-bearing sub-tubes 213 are connected in series by threaded connections to form a load-bearing tube 21. Then, a high-throughput static strength test or a high-throughput static fatigue test is conducted on the entire tube. This allows for the simultaneous testing of the mechanical properties of three different hollow specimens 2 under high temperature and high pressure hydrogen conditions. It should be noted that during laser heating, the middle section of each load-bearing sub-tube 213 is selected as the local heating location.

[0053] In some embodiments, such as Figure 2 The loading device 1 is equipped with a universal joint 5, which connects to a clamp 11. The clamp 11 is then connected to a connecting end 22 via threads. When the universal testing machine clamps the hollow specimen 2, if a traditional rigid clamping structure is used to clamp the ends of the hollow specimen 2, eccentricity / misalignment problems can easily occur between the rigid clamping structure and the hollow specimen 2, thus affecting the accuracy of the tensile test data of the hollow specimen 2. This invention provides universal joints 5 between the clamps 11 at both ends of the hollow specimen 2 and the universal testing machine. During load loading, the universal joints 5 can automatically adjust the alignment of the hollow specimen 2 during assembly and loading, ensuring that the tensile load is applied along the axis of the hollow specimen 2 and avoiding local stress concentration caused by eccentric loading.

[0054] In some embodiments, such as Figure 1The gas filling device includes a nitrogen source 71, a hydrogen source 72, a pre-charged hydrogen mixing vessel 73, and a vacuum pump 74. The nitrogen source 71 and hydrogen source 72 can be high-pressure nitrogen cylinders and high-pressure hydrogen cylinders, respectively. Both the nitrogen source 71 and hydrogen source 72 are connected to the inlet of the pre-charged hydrogen mixing vessel 73. The outlet of the pre-charged hydrogen mixing vessel 73 is connected to the hydrogen supply channel 221 of the upper connection end 22 of the hollow sample 2 via a gas valve 23. The vacuum pump 74 is connected to the hydrogen supply channel 221 of the lower connection end 22 of the hollow sample 2 via a gas valve 23. Furthermore, switching valves 76 are installed on both the inlet and outlet pipes of the pre-charged hydrogen mixing vessel 73 to control the opening and closing of the inlet pipe and the gas filling pipeline between the pre-charged hydrogen mixing vessel 73 and the hollow sample 2. Meanwhile, a pressure gauge 75 is installed on the pre-charged hydrogen mixing vessel 73 or on the pipeline between the pre-charged hydrogen mixing vessel 73 and the hollow sample 2 to detect the hydrogen pressure inside the hollow sample 2. A switch valve 76 is also installed on the exhaust pipeline between the vacuum pump 74 and the hollow sample 2 to control the opening and closing of the exhaust pipeline. The nitrogen from the nitrogen source 71 is used to purge the charging pipeline, the hollow sample 2, and the charging pipeline, and is also used to mix with hydrogen to form hydrogen of the required concentration for the experiment.

[0055] Before the test, when internally filling the hollow sample 2 with hydrogen, close the switch valve 76 on the filling pipeline, open the switch valve 76 on the exhaust pipeline, and open the gas valves 23 at both ends of the hollow sample 2. Use the vacuum pump 74 to evacuate the hollow sample 2 and the exhaust pipeline to achieve the preset negative pressure in the inner cavity of the hollow sample 2 and the exhaust pipeline. Then close the switch valve 76 on the exhaust pipeline and the gas valve 23 at the lower end of the hollow sample 2. Next, according to the hydrogen concentration required for the test, open the nitrogen source 71 and the hydrogen source 72, and introduce hydrogen and nitrogen into the pre-filled hydrogen mixing vessel 73 to mix into hydrogen of the required concentration. Next, open the switch valve 76 on the charging pipeline to allow the mixed hydrogen gas to fill the hollow sample 2. Monitor the gas pressure inside the hollow sample 2 using the pressure gauge 75. When the hydrogen pressure inside the hollow sample 2 reaches the preset pressure, close the switch valve 76 on the charging pipeline and the gas valve 23 at the top of the hollow sample 2. Block the hydrogen supply channels 221 at both ends of the hollow sample 2 through the gas valve 23, and simultaneously disconnect the charging pipeline and the exhaust pipeline from the hollow sample 2 to facilitate subsequent heating and tensile loading of the hollow sample 2. After the test is completed, reconnect the charging pipeline and the exhaust pipeline to the hollow sample 2, then open the switch valve 76 on the charging pipeline and the exhaust pipeline, and simultaneously reopen the gas valves 23 at both ends of the hollow sample 2 to purge the pipeline and the hollow sample 2 with nitrogen gas to prevent hydrogen deflagration. It should be noted that after the test is completed, the vacuum pump 74 can be separated from the exhaust pipe, and the switch valve 76 on the exhaust pipe can be opened to allow the hydrogen in the hollow sample 2 to be quickly purged out.

[0056] In some embodiments, such as Figures 2 to 4 The environmental chamber 4 includes a chamber body 41 and a cover 42 connected by hinges. Both the chamber body 41 and the cover 42 include a heat insulation layer 43 and a thermal insulation layer 44. The thermal insulation layer 44 is located inside the heat insulation layer 43 and has a mounting groove 45 and an arc-shaped groove 46. The mounting groove 45 is used to accommodate the heating element 47, and the radius of the arc-shaped groove 46 is slightly smaller than the outer diameter of the support tube 21, used to clamp the support tube 21 of the hollow sample 2. During the test, when the chamber body 41 and the cover 42 are closed, the arc-shaped grooves 46 of the chamber body 41 and the cover 42 fit against the outer wall of the support tube 21. Then, the chamber body 41 and the cover 42 are locked with bolts to ensure that the environmental chamber 4 and the support tube 21 do not slide relative to each other. It should be noted that the environmental chamber 4 is also provided with an observation window 48 for viewing the hollow sample 2 inside the environmental chamber 4.

[0057] It should be noted that the internal hydrogen filling test device of the present invention is equipped with a control device 8 and a hydrogen concentration detector, a flame detector and a smoke alarm. The control device 8 can be a control device including a PLC or a computer. The hydrogen concentration detector, the flame detector and the smoke alarm are all used to detect and warn of the hydrogen concentration, the presence of flame and smoke concentration in the environment where the internal hydrogen filling test device is located, so as to ensure the safety of the test.

[0058] The hollow sample 2 of the present invention adopts a split structure including a carrier tube 21 and a connecting end 22. Compared with the integrated hollow sample 2 in the prior art, it has the following differences or advantages: (1) The inner wall of hydrogen-related components in hydrogen fuel aero-engines needs to be processed into a mirror-smooth wall surface. Due to the high processing difficulty of the inner wall of the middle section of the existing integrated hollow sample 2, the hollow sample 2 of the present invention adopts a split structure, which can shorten the path length of the hydrogen filling slender pipe in the sample in one processing, thereby reducing the processing difficulty and cost of the inner wall of the carrier tube 21; (2) When conducting internal hydrogen filling tests on different materials under high temperature and high pressure, only the carrier tube 21 of the corresponding material needs to be replaced. The connecting end 22, as a common part, does not need to be replaced, thereby improving the material's efficiency. The purpose of material utilization; (3) The hollow sample 2 adopts a split structure design, so that the bearing tube 21 of the hollow sample 2 can be processed separately, which is convenient to prefabricate defects in the test area in the middle of the hollow sample 2 to study the hydrogen-induced failure mechanism of the material; (4) The hollow sample 2 adopts a split structure design, which can be used to test the static strength of threaded connection, welding, bonding and other connection forms by designing the connection form of the bearing tube 21; the hollow sample 2 can also be used for creep test and fatigue performance test by designing the shape of the bearing tube 21; the number of bearing sub-tubes 213 that make up the bearing tube 21 can be designed to meet the needs of high-throughput material testing, improve the material screening efficiency, and achieve the purpose of expanding the sample range.

[0059] Based on the same inventive concept, the present invention also provides a method for internal hydrogen filling test under high temperature and high pressure environment, implemented based on the aforementioned internal hydrogen filling test device, comprising:

[0060] Step 1: Clamp the hollow sample 2 onto the clamp 11 of the loading device 1, and install the environmental chamber 4 on the hollow sample 2;

[0061] Step 2: Connect the filling device to the hydrogen delivery channel 221 of the hollow sample 2, and fill the hollow sample 2 with hydrogen until the hydrogen pressure of the hollow sample 2 reaches the preset pressure. Then separate the filling device from the hollow sample 2 and seal the hydrogen delivery channels 221 at both ends of the hollow sample 2.

[0062] Step 3: Use the laser heating device 6 to locally heat the carrier tube 21 of the hollow sample 2 to a preset temperature, and start the heating element 47 of the environmental chamber 4 to heat the temperature inside the environmental chamber 4 to the preset ambient temperature.

[0063] Step 4: Start loading device 1 to conduct static strength test, creep test or fatigue test.

[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An internal hydrogen filling test device under high temperature and high pressure environment, characterized in that, include: A hollow sample (2) includes a support tube (21) and a connecting end (22). The two ends of the support tube (21) are threaded to a connecting end (22), and the connecting end (22) is provided with a hydrogen transport channel (221) communicating with the support tube (21). The support tube (21) includes an upper support tube (211) and a lower support tube (212), and the upper support tube (211) and the lower support tube (212) are bonded or welded together. The loading device (1) is provided with a clamp (11), which is used to clamp the connecting end (22) of the hollow sample (2) and apply a tensile load to the hollow sample (2); the clamp (11) is provided with a cooling component (12), which is connected to an external cooling device (9); A gas filling device is connected to the hydrogen supply channel (221) of the connecting end (22) and is used to fill hydrogen into the bearing pipe (21) through the hydrogen supply channel (221) so that the hydrogen pressure in the bearing pipe (21) reaches a preset pressure. Laser heating device (6), the laser heating device (6) is used to locally heat the carrier tube (21) of the hollow sample (2) to a preset temperature; An environmental chamber (4) is used to wrap around and fix the support tube (21) of the hollow sample (2) to maintain the temperature of the support tube (21) during the test.

2. The internal hydrogen charging test apparatus according to claim 1, characterized in that, The inner wall of the bearing pipe (21) is provided with a prefabricated notch (3).

3. The internal hydrogen charging test apparatus according to claim 1, characterized in that, The bearing pipe (21) includes at least two bearing sub-pipes (213) of different materials, which are connected in series by threads.

4. The internal hydrogen charging test device according to claim 1, characterized in that, The outer wall of the bearing tube (21) is provided with a shoulder (214).

5. The internal hydrogen charging test apparatus according to any one of claims 1-4, characterized in that, The loading device (1) is connected to the clamp (11) via a universal joint (5), and the clamp (11) is threadedly connected to the connecting end (22).

6. The internal hydrogen charging test apparatus according to claim 5, characterized in that, The gas filling device includes a nitrogen source (71), a hydrogen source (72), a pre-charged hydrogen mixing vessel (73), and a vacuum pump (74). The nitrogen source (71) and the hydrogen source (72) are both connected to the gas inlet of the pre-charged hydrogen mixing vessel (73). The gas outlet of the pre-charged hydrogen mixing vessel (73) is connected to the hydrogen supply channel (221) of one connection end (22) of the hollow sample (2). The vacuum pump (74) is connected to the hydrogen supply channel (221) of the other connection end (22) of the hollow sample (2).

7. The internal hydrogen charging test apparatus according to claim 6, characterized in that, The environmental chamber (4) includes a chamber body (41) and a lid (42) connected by hinges. Both the chamber body (41) and the lid (42) are provided with a heat insulation layer (43) and a heat preservation layer (44). The heat preservation layer (44) is located inside the heat insulation layer (43). The heat preservation layer (44) is provided with a heating element (47) for maintaining the temperature of the carrier tube (21) during the test.

8. A method for internal hydrogen filling test under high temperature and high pressure environment, implemented based on the internal hydrogen filling test device according to any one of claims 1-7, characterized in that, include: The hollow sample (2) is clamped on the clamp (11) of the loading device (1), and an environmental chamber (4) is installed on the hollow sample (2); Connect the gas filling device to the hydrogen supply channel (221) of the hollow sample (2) and fill the hollow sample (2) with hydrogen until the hydrogen pressure of the hollow sample (2) reaches the preset pressure. Then separate the gas filling device from the hollow sample (2) and seal the hydrogen supply channels (221) at both ends of the hollow sample (2). The support tube (21) of the hollow sample (2) is locally heated to a preset temperature using a laser heating device (6), and the heating element (47) of the environmental chamber (4) is activated to heat the temperature inside the environmental chamber (4) to a preset ambient temperature. Start the loading device (1) to conduct static strength test, creep test or fatigue test.

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