Device for testing compatibility of metal material and hydrogen environment

Abstract

The utility model relates to the technical field of metal mechanical property detection testing equipment, in particular to a metal material and hydrogen environment compatibility testing device which comprises an upper clamp, a vacuum pump and a first gas storage bottle, the first gas storage bottle is used for storing high-pressure gas of types required by testing, one end of the upper clamp is detachably connected with a sample, and the other end of the upper clamp is detachably connected with a second gas storage bottle. The upper clamp is used for blocking a central channel of a sample and forming a first cavity body, the vacuum pump and the first gas storage bottle are respectively communicated with the first cavity body, and during use, the upper clamp can be detached from one end of the sample, and the sealed first cavity body is formed between the upper clamp and the central channel of the sample; the second cavity cools the sample to a required temperature, or the sample is heated to the required temperature through the induction heating coil, so that the temperature control during the test of the sample is realized, the test requirement is met, the test accuracy is improved, the test cost is reduced, and the test safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of metal mechanical property detection and testing equipment, in particular to a device for testing the compatibility of metal materials with a hydrogen environment. Background Art

[0002] Hydrogen embrittlement is a general term that describes the phenomenon of metal failure caused by the interaction between hydrogen atoms and metals. Fatigue life testing of metal materials after hydrogen charging is one of the main evaluation methods for studying hydrogen embrittlement. In the existing technology, hydrogen charging mainly includes electrochemical hydrogen charging and gas phase hydrogen charging. The electrochemical hydrogen charging device is simple to operate and has high hydrogen charging efficiency, but the metal materials actually serve in a gaseous hydrogen environment, and there are limitations to studying hydrogen embrittlement by electrochemical hydrogen charging. Gas phase hydrogen charging is to place the metal material in a pressure vessel and introduce high-pressure hydrogen for hydrogen charging. The hydrogen charging operation process is cumbersome, and as the hydrogen charging pressure increases, the danger becomes greater. The A286 material used for pressure vessels is also relatively expensive. In addition, in order to meet the service environment of the metal material, the test often needs to be carried out in a high and low temperature environment. If a high and low temperature environment is introduced during the high-pressure gas phase hydrogen charging process, the cost of the test and the safety risks will be further increased. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to solve the problems that the existing gas-phase hydrogen charging is to place the metal material in a pressure vessel and introduce high-pressure hydrogen for hydrogen charging, the hydrogen charging operation process is cumbersome, the danger becomes increasingly greater as the hydrogen charging pressure increases, and the price of the A286 material used for the pressure vessel is also relatively expensive, a device for testing the compatibility of metal materials with hydrogen environment is now provided.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a device for testing the compatibility of metal materials with a hydrogen environment, comprising an upper fixture, a vacuum pump, and a first gas storage cylinder, wherein the first gas storage cylinder is used to store the type of high-pressure gas required for the test; one end of the upper fixture is detachably connected to the sample; the upper fixture is used to block the central channel of the sample and form a first cavity; the vacuum pump and the first gas storage cylinder are respectively connected to the first cavity; a temperature control mechanism for controlling the sample to a desired temperature is provided below the upper fixture;

[0005] The temperature control mechanism includes a second gas cylinder, an induction heating coil and a freezer. The second gas cylinder is used to store a cooling medium. The freezer is provided with a hole matching the sample. The hole is used to be sleeved on the outer circumferential surface of the sample. A groove is provided on the inner circumferential wall of the hole in the freezer. A closed second cavity is formed between the inner circumferential wall of the hole, the groove and the outer circumferential wall of the sample. The second cavity is located outside the central channel. The second gas cylinder is connected to the second cavity. The induction heating coil is sleeved on the outer circumferential surface of the freezer and located outside the central channel. Compared with the existing technology, this solution forms a sealed first cavity between a detachable upper clamp at one end of the sample and the upper clamp and the central channel of the sample, and then evacuates the first cavity through a vacuum pump, and then the required test gas is transported to the first cavity by the first gas cylinder. At the same time, the holes of the freezer are mounted on the sample, and the cooling medium is transported to the second cavity by the second gas cylinder. The second cavity cools the sample to the required temperature, or heats the sample to the required temperature through the induction heating coil, thereby achieving temperature control during sample testing, meeting test requirements, improving test accuracy, and ensuring test safety. It does not require expensive pressure vessels and reduces usage costs.

[0006] To facilitate the placement of the freezer on the sample, in some embodiments, the freezer is preferably a half-shell structure. By configuring the freezer as a half-shell structure with two opposing half-shell structures, the freezer can be quickly installed or removed, facilitating sample testing and improving test efficiency.

[0007] In order to ensure the sealing performance of the freezing box, preferably in some embodiments, a first sealing filler is axially arranged between the half structures of the freezing box. The sealing performance of the freezing box is improved by arranging the first sealing filler between the half structures of the freezing box.

[0008] To ensure the sealing of the second cavity, in some preferred embodiments, a second sealing filler is provided between the holes at both ends of the groove and the sample. By providing the second sealing filler at both ends of the holes in the groove, the second cavity is axially sealed, ensuring stable and reliable cooling of the sample and preventing rapid leakage of the cooling medium.

[0009] In order to facilitate monitoring of the temperature in the second cavity and better temperature control of the sample, in some preferred embodiments, the freezer is provided with a temperature device for monitoring the temperature in the second cavity. By providing the temperature device on the freezer and monitoring the temperature in the second cavity, the temperature in the second cavity can be easily observed and precise temperature control of the sample can be achieved.

[0010] To achieve a detachable connection between the upper fixture and the specimen, some preferred embodiments include a clamping section and a connecting section interconnected with each other, a mounting hole defined in the connecting section, one end of the specimen being threadedly connected to the mounting hole, and an air passage provided in the connecting section. One end of the air passage is disposed at the bottom of the mounting hole and is configured to communicate with the central passage of the specimen, while the other end of the air passage extends to the outer circumference of the connecting section and communicates with the vacuum pump and the first gas cylinder. The upper fixture is threadedly connected to one end of the specimen through the mounting hole, and one end of the central passage is disposed within the mounting hole, sealing the central passage. The vacuum pump and the first gas cylinder are connected to the central passage via the air passage, thereby achieving communication between the specimen, the vacuum pump, and the first gas cylinder.

[0011] In order to achieve communication between the air passage, the vacuum pump, and the first gas cylinder, in some preferred embodiments, the other end of the air passage is connected to the vacuum pump and the first gas cylinder via an external pipeline. The external pipeline includes a main pipe and a first branch pipe and a second branch pipe connected to the main pipe. One end of the main pipe is connected to the other end of the air passage, the first branch pipe is connected to the output end of the vacuum pump, and the second branch pipe is connected to the output end of the first gas cylinder. With one end of the main pipe connected to the air passage, and the other end of the main pipe passing between the vacuum pump and the first gas cylinder, the air passage is connected to the vacuum pump and the first gas cylinder.

[0012] In order to ensure the safety of the test, in some preferred embodiments, a first one-way valve is provided on the first branch pipe, and a first high-pressure needle valve is provided on each of the second branch pipes.

[0013] In order to ensure the safety of the test, some preferred embodiments are that a second one-way valve and a second high-pressure needle valve are provided on the main pipe, the first branch pipe and the second branch pipe are located on one side of the second one-way valve, the air path is located on the other side of the second one-way valve, and the second high-pressure needle valve is located between the first branch pipe and the second branch pipe.

[0014] In order to ensure the safety of the test, in some preferred embodiments, a pressure gauge is provided on the main pipe, and the pressure gauge is located between the second valve and the other end of the gas path.

[0015] The beneficial effects of the utility model are as follows: when in use, the utility model is a device for testing the compatibility of metal materials with hydrogen environments. A removable upper clamp is provided at one end of the sample, and a sealed first cavity is formed between the upper clamp and the central channel of the sample. The first cavity is evacuated by a vacuum pump, and the required test gas is then delivered to the first cavity by the first gas cylinder. At the same time, the hole of the freezer is sleeved on the sample, and the cooling medium is delivered to the second cavity by the second gas cylinder. The second cavity cools the sample to the required temperature, or heats the sample to the required temperature through the induction heating coil, thereby achieving temperature control during sample testing, meeting test requirements, improving test accuracy, eliminating the need for expensive pressure vessels, reducing test costs, and ensuring test safety. It avoids the problems of existing gas-phase hydrogen charging, which is to place metal materials in pressure vessels and introduce high-pressure hydrogen for hydrogen charging. The hydrogen charging operation process is cumbersome, and as the hydrogen charging pressure increases, the risk becomes increasingly greater, and the price of the A286 material used for the pressure vessel is also relatively expensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 It is the main view of the sample of the utility model;

[0018] Figure 2 It is a top view of the sample of the utility model;

[0019] Figure 3 It is a structural diagram of the utility model;

[0020] Figure 4 It is a cross-sectional view of the upper clamp of the utility model;

[0021] Figure 5 It is a top view of the upper clamp of the utility model;

[0022] Figure 6 This is a front view of the induction heating coil in the present utility model;

[0023] Figure 7 This is a schematic diagram of half of the freezer structure in this utility model. Figure 1 ;

[0024] Figure 8 This is a schematic diagram of half of the freezer structure in this utility model. Figure 2 .

[0025] In the figure: 1, upper fixture, 101, clamping section, 102, connecting section, 103, mounting hole, 104, air passage;

[0026] 2. Vacuum pump, 3. First gas cylinder, 4. First cavity, 5. Second gas cylinder, 6. Induction heating coil, 7. Freezer, 8. Second cavity, 9. First sealing packing, 10. Second sealing packing, 11. Temperature device, 12. Main pipe, 13. First branch pipe, 14. Second branch pipe, 15. First one-way valve, 16. First high-pressure needle valve, 17. Second one-way valve, 18. Second high-pressure needle valve, 19. Pressure gauge;

[0027] 20. Specimen, 201. Center channel, 202. Upper fixed section, 203. Middle section, 204. Lower fixed section. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the following embodiments:

[0029] The present invention is not limited to the following specific embodiments. Based on the disclosure of this invention, a person skilled in the art can adopt a variety of other specific embodiments to implement the present invention. Any simple changes or modifications made to the design structure and concept of this invention fall within the scope of protection of this invention. It should be noted that the embodiments and features of the embodiments of this invention can be combined with each other unless there is a conflict.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] like Figure 1-8 As shown, a device for testing the compatibility of a metal material with a hydrogen environment includes an upper fixture 1, a vacuum pump 2, and a first gas cylinder 3. The first gas cylinder 3 is used to store the type of high-pressure gas required for the test. In this embodiment, the stored gas is high-pressure hydrogen. Of course, in addition to hydrogen, other required test gases, such as helium, can also be stored. One end of the upper fixture 1 is detachably connected to the sample 20. The upper fixture 1 is used to block the central channel 201 of the sample 20 and form a first cavity 4. The vacuum pump 2 and the first gas cylinder 3 are respectively connected to the first cavity 4. A temperature control mechanism is provided below the upper fixture 1. The temperature control mechanism is used to control the sample 20 to a desired temperature. In this embodiment, the temperature control mechanism can heat and increase the temperature of the sample 20, and can also cool and reduce the temperature.

[0033] The temperature control mechanism includes a second gas cylinder 5, an induction heating coil 6 and a freezer 7. The second gas cylinder 5 is used to store a cooling medium. In this embodiment, the cooling medium is liquid nitrogen. Of course, in addition to liquid nitrogen, it can also be Freon, alkane, ammonia or carbon dioxide, etc. The freezer 7 is provided with holes along its axial direction that match the sample 20. The through hole is used to be sleeved on the outer peripheral surface of the sample 20. A groove is provided on the inner peripheral wall of the hole on the freezer 7. A closed second cavity 8 is formed between the inner peripheral wall of the hole, the groove and the outer peripheral wall of the sample 20. The second cavity 8 is located on the outside of the central channel 201. The second gas cylinder 5 is connected to the second cavity 8. The induction heating coil 6 is sleeved on the outer peripheral surface of the freezer 7 and is located on the outside of the central channel 201.

[0034] The upper connector and the lower connector of the induction heating coil 6 are connected to the main control box of the induction heating power supply, and the freezing box 7 is placed in the induction heating coil 6 as a whole.

[0035] The freezer 7 is a half structure, that is, the freezer 7 is composed of two completely symmetrical half boxes connected by bolts. A first sealing filler 9 is axially arranged between the half structures of the freezer 7, and a second sealing filler 10 is arranged between the two ends of the groove and the sample 20 to ensure the sealing of the second cavity body and avoid the medium in the second cavity body 8 from leaking too quickly when the second gas cylinder 5 transports the cooling medium.

[0036] The freezer 7 is provided with a temperature device 11 for monitoring the temperature within the second cavity 8. In this embodiment, the temperature device 11 is a thermometer. Of course, the temperature device 11 can also be a temperature sensor. A certain gap is left between the pipe at one end of the second gas cylinder 5 and the thermometer at the second cavity 8 to prevent excessive pressure in the freezer 7.

[0037] The upper fixture 1 has a clamping section 101 and a connecting section 102 that are connected to each other. A mounting hole 103 is provided on the connecting section 102. One end of the sample 20 is threadedly connected to the mounting hole 103. An internal thread is provided in the mounting hole 103. An air path 104 is provided on the connecting section 102. One end of the air path 104 is provided at the bottom of the mounting hole 103 and is used to communicate with the central channel 201 of the sample 20. The other end of the air path 104 extends to the outer peripheral surface of the connecting section 102 and is connected to the vacuum pump 2 and the first gas storage cylinder 3.

[0038] The other end of the gas path channel 104 is connected to the vacuum pump 2 and the first gas cylinder 3 through an external pipeline. The external pipeline includes a main pipe 12 and a first branch pipe 13 and a second branch pipe 14 connected to the main pipe 12. One end of the main pipe 12 is connected to the other end of the gas path channel 104 through a pipeline joint. The first branch pipe 13 is connected to the output end of the vacuum pump 2, and the second branch pipe 14 is connected to the output end of the first gas cylinder 3.

[0039] A first one-way valve 15 is provided on the first branch pipe 13, and the first one-way valve 15 is used to prevent the vacuum pump 2 from stopping operation. A first high-pressure needle valve 16 is provided on the second branch pipe 14, and a second one-way valve 17 and a second high-pressure needle valve 18 are provided on the main pipe 12. The first branch pipe 13 and the second branch pipe 14 are located on one side of the second one-way valve 17, and the air path 104 is located on the other side of the second one-way valve 17. The second high-pressure needle valve 18 is located between the first branch pipe 13 and the second branch pipe 14. A pressure gauge 19 is provided on the main pipe 12, and the pressure gauge 19 is located between the second valve and the other end of the air path 104.

[0040] In this embodiment, the sample 20 has an upper fixed section 202, an intermediate section 203 and a lower fixed section 204 connected in sequence. A threaded portion is provided on the upper fixed section 202, and a central channel 201 is opened at one end of the sample 20 close to the threaded portion. The central channel 201 is a blind hole, and the central channel 201 extends from the upper fixed section 202 of the sample 20 to the intermediate section 203.

[0041] When using the above-mentioned metal material and hydrogen environment compatibility testing device, the specific operating steps are as follows:

[0042] S1. During assembly, the upper clamping section 101 at the upper end of the specimen 20 is connected to the mounting hole 103 of the upper fixture 1 through threads;

[0043] S2. Place the first sealing filler 9 and the second sealing filler 10 in the sealing grooves of the half-box of the freezer 7. Place the two half-boxes on both sides of the middle section 203 of the sample 20. Connect the two half-boxes with bolts to form the freezer 7. Then, extend the pipe of the second gas storage tank and the thermometer into the second cavity 8 of the freezer 7. Complete the installation of the freezer 7 on the sample 20.

[0044] S3, the induction heating coil 6 is inserted from the lower end of the sample 20, so that the freezer 7 is completely inside the induction heating coil 6;

[0045] S4. During the test, the second high-pressure needle valve 18 near the pressure gauge 19 is opened, the first high-pressure needle valve 16 at the first gas storage cylinder 3 is closed, and the vacuum pump 2 is turned on to evacuate the main pipe 12 and the central channel 201 of the sample 20;

[0046] S5. After the vacuuming is completed, the vacuum pump 2 is turned off, and the first high-pressure needle valve 16 near the first gas cylinder 3 is opened. Hydrogen is then introduced into the central channel 201 inside the sample 20 and pressurized. The internal pressure of the sample 20 is observed using the pressure gauge 19. When the pressure reaches a predetermined value, the first high-pressure needle valve 16 near the first gas cylinder 3 and the second high-pressure needle valve 18 near the pressure gauge 19 are closed.

[0047] S6. Using the second gas cylinder 5, the content of liquid nitrogen in the freezer 7 and the temperature of the induction heating coil 6 are adjusted to apply the required test temperature to the sample 20;

[0048] S7. The upper clamping section 101 at the upper end of the upper fixture 1 and the lower fixing section 204 at the lower end of the sample 20 are fixed on a fatigue life testing machine through a hydraulic clamp, and the hydrogen environment compatibility of the sample 20 is tested through an alternating tension and compression fatigue test.

[0049] The above-described preferred embodiments of the present invention are intended as a guide. Based on the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A device for testing the compatibility of metal materials with hydrogen environments, characterized by: The invention comprises an upper fixture (1), a vacuum pump (2) and a first gas storage bottle (3), wherein the first gas storage bottle (3) is used to store a type of high-pressure gas required for testing, one end of the upper fixture (1) is detachably connected to the sample (20), the upper fixture (1) is used to block the central channel (201) of the sample (20) and form a first cavity (4), the vacuum pump (2) and the first gas storage bottle (3) are respectively connected to the first cavity (4), and a temperature control mechanism for controlling the sample (20) to a desired temperature is provided below the upper fixture (1); The temperature control mechanism comprises a second gas cylinder (5), an induction heating coil (6) and a freezer (7), wherein the second gas cylinder (5) is used to store a cooling medium, the freezer (7) is provided with a hole matching the sample (20), the hole is used to be sleeved on the outer peripheral surface of the sample (20), the inner peripheral wall of the hole on the freezer (7) is provided with a groove, and a closed second cavity (8) is formed between the inner peripheral wall of the hole, the groove and the outer peripheral wall of the sample (20), the second cavity (8) is located outside the central channel (201), the second gas cylinder (5) is connected to the second cavity (8), and the induction heating coil (6) is sleeved on the outer peripheral surface of the freezer (7) and located outside the central channel (201).

2. The device for testing compatibility of metal materials with hydrogen environments according to claim 1, characterized in that: The freezing box (7) is a Hough structure.

3. The device for testing the compatibility of metal materials with hydrogen environments according to claim 2, characterized in that: A first sealing filler (9) is axially arranged between the half structures of the freezing box (7).

4. The device for testing the compatibility of metal materials with hydrogen environments according to claim 1, characterized in that: The hole is located at both ends of the groove and is provided with a second sealing filler (10) between the sample (20).

5. The device for testing the compatibility of metal materials with hydrogen environments according to claim 1, characterized in that: The freezing box (7) is provided with a temperature device (11) for monitoring the temperature in the second cavity (8).

6. The device for testing the compatibility of metal materials with hydrogen environments according to claim 1, characterized in that: The upper clamp (1) comprises a clamping section (101) and a connecting section (102) which are connected to each other, a mounting hole (103) is provided on the connecting section (102), one end of the sample (20) is threadedly connected in the mounting hole (103), an air passage (104) is provided on the connecting section (102), one end of the air passage (104) is provided at the bottom of the mounting hole (103) and is used to communicate with the central channel (201) of the sample (20), and the other end of the air passage (104) extends to the outer peripheral surface of the connecting section (102) and is connected with the vacuum pump (2) and the first gas storage bottle (3).

7. The device for testing the compatibility of metal materials with hydrogen environments according to claim 6, characterized in that: The other end of the gas passage (104) is in communication with the vacuum pump (2) and the first gas storage cylinder (3) via an external pipeline, wherein the external pipeline comprises a main pipe (12) and a first branch pipe (13) and a second branch pipe (14) in communication with the main pipe (12); one end of the main pipe (12) is in communication with the other end of the gas passage (104); the first branch pipe (13) is in communication with the output end of the vacuum pump (2); and the second branch pipe (14) is in communication with the output end of the first gas storage cylinder (3).

8. The device for testing the compatibility of metal materials with hydrogen environments according to claim 7, characterized in that: The first branch pipe (13) is provided with a first one-way valve (15), and the second branch pipe (14) is provided with a first high-pressure needle valve (16).

9. The device for testing the compatibility of metal materials with hydrogen environments according to claim 8, characterized in that: The main pipe (12) is provided with a second one-way valve (17) and a second high-pressure needle valve (18); the first branch pipe (13) and the second branch pipe (14) are located on one side of the second one-way valve (17); the gas passage (104) is located on the other side of the second one-way valve (17); and the second high-pressure needle valve (18) is located between the first branch pipe (13) and the second branch pipe (14).

10. The device for testing the compatibility of metal materials with hydrogen environments according to claim 9, characterized in that: A pressure gauge (19) is provided on the main pipe (12), and the pressure gauge (19) is located between the second valve and the other end of the gas passage (104).

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