A device for testing the sealing performance of an O-ring under high-pressure hydrogen environment

Abstract

The present invention discloses an O-ring sealing performance test device under high-pressure hydrogen environment, which specifically relates to the technical field of sealing component testing devices, including a test base; a hydrogen storage tank; a gas transmission port; a test seat; a connecting groove; a sealing chamber; a translation component; a sealing component, which is used to close the connecting groove in the initial state, and when the sliding column moves toward the hydrogen storage tank, the connecting groove can be opened so that the high-pressure hydrogen in the hydrogen storage tank can enter the test seat; and a test component. The test component can be used to test the change in air pressure inside the hydrogen storage tank when the sliding column is in a moving state. When the sliding column slides into place and is in a stationary state, the test component can be used to continuously test the change in air pressure inside the hydrogen storage tank in a stationary state, thereby analyzing the sealing performance of the O-ring in both the stationary and moving states. The operation is convenient and does not require human intervention.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing component testing devices, and more particularly to a device for testing the sealing performance of an O-ring in a high-pressure hydrogen environment. Background Art

[0002] An O-ring is a rubber seal with a circular cross-section. Because of its O-shaped cross-section, it is called an O-ring. O-rings are suitable for installation on various mechanical equipment to provide a seal in a static or moving state under specified temperatures, pressures, and in different liquid and gaseous media.

[0003] O-rings are usually used to seal the connection parts in hydrogen storage systems. Since hydrogen is usually stored at high pressure, the sealing performance of the O-ring directly affects the sealing performance of the hydrogen storage system. Therefore, the sealing performance of the O-ring needs to be tested. After searching, Chinese Patent No. CN106706220A discloses a rubber O-ring sealing performance test device in a high-pressure hydrogen environment. The device mainly includes a rubber O-ring to be tested, a pressure cover, a signal processor, a protective shell, screws, a discharge port, a cantilever beam pressure sensor, a hydrogen sensor, a force transmission rod, a sealing O-ring, a pressure ring, a base, an inlet / exhaust port, a gasket, an inner screw and an outer screw; the pressure ring is a hollow circular ring structure, and a test cavity is formed between the pressure cover and the base, and the sealing is achieved by the rubber O-ring to be tested; the base is a cylinder with an open upper part and a closed lower part, and an inlet / exhaust port is opened at the bottom center of the base for the intake and discharge of the test gas.

[0004] The sealing performance testing device for sealing rings in the above-mentioned prior art tests the sealing performance of the O-ring when it is in a stationary state. However, in a hydrogen storage system, some components equipped with O-rings are usually in motion, so the sealing performance of the O-ring in a moving state also needs to be tested. Therefore, a device is needed that can test the sealing performance of the O-ring in both stationary and moving states. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides an O-ring sealing performance testing device in a high-pressure hydrogen environment. The technical problem to be solved by the present invention is that the O-ring sealing performance testing device in the prior art can only perform sealing performance tests on O-rings in a stationary state, but cannot perform sealing performance tests on O-rings in a moving state.

[0006] To achieve the above object, the present invention provides the following technical solution: an O-ring sealing performance testing device under high-pressure hydrogen environment, comprising:

[0007] Test base;

[0008] A hydrogen storage tank is installed at one end of the test base, and the hydrogen storage tank is provided with a gas transmission port connected to the high-pressure hydrogen transmission system;

[0009] A test seat is connected to the end of the hydrogen storage tank away from the gas transmission port, the interior of the test seat is hollow, and a communication groove that penetrates the interior of the test seat is opened on the outer wall of the hydrogen storage tank;

[0010] A sealed chamber is coaxially connected to the test seat, and a communication cavity communicating with the test seat is defined in the sealed chamber;

[0011] A sliding post is engaged with the test seat and forms a sliding fit with the interior of the test seat. A mounting groove for an O-ring is coaxially provided on the periphery of the sliding post. The sliding post is driven by a translation component to move toward the inside of the hydrogen storage tank.

[0012] A sealing component, configured to seal the communication groove in an initial state, and to open the communication groove when the sliding post moves toward the hydrogen storage tank, so that the high-pressure hydrogen in the hydrogen storage tank can enter the test seat;

[0013] The testing component is used to test the pressure change in the hydrogen storage tank after the connecting groove is opened.

[0014] like Figure 1-9 As shown, the specific implementation method is as follows: the O-ring is assembled to the mounting groove of the sliding column, and the high-pressure hydrogen delivery system delivers the high-pressure hydrogen to the hydrogen storage tank through the pipeline. At this time, the sealing component closes the connecting groove to prevent the high-pressure hydrogen from leaking from the connecting groove, and then the translation component drives the sliding column to move toward the inside of the hydrogen storage tank. At this time, the O-ring is in a moving state in the test seat. After sliding to a certain stroke, the sliding column contacts the sealing component and activates the sealing component, thereby opening the connecting groove, thereby allowing the high-pressure hydrogen in the hydrogen storage tank to enter the test seat through the connecting groove. Since the sliding column is still in motion at this time Therefore, when high-pressure hydrogen enters the test seat, the test component can test the change in air pressure inside the hydrogen storage tank when the sliding column is in a moving state. When the sliding column slides into place and is in a stationary state, the test component can continuously test the change in air pressure inside the hydrogen storage tank in a stationary state, thereby analyzing the sealing performance of the O-ring in both stationary and moving states. Since high-pressure hydrogen can automatically enter the test seat through the sliding of the sliding column, the sealing performance of the O-ring can be tested through the change in air pressure in the hydrogen storage tank. The operation is convenient and no human intervention is required.

[0015] In a preferred embodiment, the sealing component includes:

[0016] A driving rod is horizontally arranged in the hydrogen storage tank, and one end of the driving rod is inserted into the test seat, and the driving rod can slide freely on the outer wall of the hydrogen storage tank;

[0017] a first sealing plug, fixedly sleeved on the portion of the driving rod located inside the hydrogen storage tank, wherein a side projection area of ​​the first sealing plug can cover the communicating groove;

[0018] The elastic driving structure is used to drive the driving rod to slide toward the outside of the hydrogen storage tank in the initial state, and to make the first sealing plug abut against the inner wall of the hydrogen storage tank, thereby sealing the communicating groove.

[0019] When the cam is in the closed position, the first sealing plug is moved to the left of the cam, and the cam is in the closed position, so that the cam will not be released from the cam, and the cam will not be released from the cam.

[0020] In a preferred embodiment, a second sealing plug is fixedly mounted on one end of the driving rod that penetrates into the hydrogen storage tank. When the first sealing plug moves toward the inside of the hydrogen storage tank, the second sealing plug can close the gas transmission port.

[0021] When the driving rod is in the initial state, the first sealing plug is against the inner wall of the hydrogen storage tank. At this time, the second sealing plug is out of the state of being against the inner wall of the hydrogen storage tank. When the driving rod is pushed by the sliding column and moves toward the inner side of the hydrogen storage tank, the first sealing plug is out of the state of being against the inner wall of the hydrogen storage tank, so that the connecting groove is opened, and the second sealing plug will be against the inner wall of the hydrogen storage tank, thereby making it impossible for the external high-pressure hydrogen delivery system to continue to deliver high-pressure hydrogen to the inside of the hydrogen storage tank. This avoids errors in the test accuracy of the test component caused by continuous delivery of high-pressure hydrogen to the hydrogen storage tank.

[0022] In a preferred embodiment, the elastic drive structure includes:

[0023] A fixed sleeve is fixedly connected to the outer wall of the hydrogen storage tank and is located in the test seat. The fixed sleeve is hollow inside, and the drive rod can slidably pass through the fixed sleeve. When the sliding column moves toward the inside of the hydrogen storage tank, it can abut against the end of the drive rod that passes through the fixed sleeve;

[0024] A sliding block is engaged with the fixed sleeve and forms a sliding fit with the inner wall of the fixed sleeve, and the sliding block is fixedly sleeved on one end of the driving rod that penetrates into the fixed sleeve;

[0025] The spring is sleeved on the driving rod, and two ends of the spring force direction elastically press against the sliding block and the outer wall of the hydrogen storage tank respectively.

[0026] The spring elastically supports the sliding block, so that the driving rod can pass through the fixed sleeve. When the sliding column moves toward the inside of the hydrogen storage tank, the sliding block will compress the spring. When the sliding column moves in the opposite direction, the elastic potential energy of the spring is released and the sliding block can move toward the outside of the hydrogen storage tank, thereby enabling the first sealing plug to seal the connecting groove. The structure is simple and no additional power element is required to realize the movement of the driving rod.

[0027] In a preferred embodiment, the sealing chamber is connected to a vacuum chamber through a connecting pipe, and a piston is engaged in the vacuum chamber. The piston forms a sliding fit with the inside of the vacuum chamber. When the driving rod moves toward the inside of the hydrogen storage tank, it can drive the piston to move toward the inside of the hydrogen storage tank.

[0028] By sliding the piston toward the outside of the vacuum chamber in the vacuum chamber, the air inside the connecting chamber is diluted during the test, causing the internal air pressure to decrease. This allows the test component to more accurately and intuitively test the air pressure changes in the connecting chamber.

[0029] In a preferred embodiment, a pull rod is coaxially fixed to the piston, and the end of the pull rod away from the piston can be slidably inserted into the hydrogen storage tank. The pull rod and the drive rod are located in the hydrogen storage tank and are fixedly mounted with a first rack column and a second rack column respectively. The inner wall of the hydrogen storage tank is rotatably connected to the first gear and the second gear. The first gear and the second gear are in a meshing state, and the first gear is meshed with the outside of the second rack column. The second gear is connected to an arc gear through a swing arm, and the arc gear is meshed with the outside of the first rack column. When the drive rod moves toward the inside of the hydrogen storage tank, the arc gear can be meshed with the first rack column and drive the pull rod to move toward the inside of the hydrogen storage tank.

[0030] The sliding column moves toward the inner side of the hydrogen storage tank until it hits the end of the driving rod and can drive the driving rod to slide toward the inner side of the hydrogen storage tank. The driving rod can drive the second rack column to move. When the second rack column moves, it will drive the first gear to rotate. The first gear and the second gear are meshed for transmission, and then can drive the arc gear to rotate. The arc gear is meshed with the first rack column. At the same time, the movement directions of the first rack column and the second rack column are the same, so the pull rod will drive the piston to move toward the inner side of the hydrogen storage tank. The piston can draw the air in the connecting chamber into the air pumping chamber. Since the molecular weight of the air in the connecting chamber remains unchanged, the volume increases, which reduces the air pressure in the connecting chamber. When the sealing performance of the O-ring is low, high-pressure hydrogen will enter the connecting chamber. At this time, the air pressure change in the connecting chamber can be quickly tested by the test component.

[0031] In a preferred embodiment, the nominal diameter of the first gear is at least twice the nominal diameter of the second gear. When the first gear rotates, it drives the second gear to rotate, and the angular travel of the second gear is greater than the angular travel of the first gear. This allows the arc-shaped gear to drive the pull rod to move a greater distance. This allows the pull rod to translate a greater distance even when the travel of the drive rod is relatively small, thus ensuring sufficient sliding travel for the piston and significantly reducing the air pressure in the communication chamber.

[0032] In a preferred embodiment, the translation component includes a cylinder horizontally mounted on the test base via a mounting bracket, wherein the cylinder rod of the cylinder is connected to the sliding post. The cylinder rod of the cylinder is extended to drive the sliding post to penetrate the connecting cavity into the test base.

[0033] In a preferred embodiment, the test component includes:

[0034] a connecting column, coaxially connected to the sliding column;

[0035] A sealing cover is coaxially fixedly sleeved on one end of the connecting column passing through the communicating cavity, and the sealing cover is capable of sealing the communicating cavity after abutting against the end surface of the sealing chamber;

[0036] The two pressure gauges are defined as a first pressure gauge and a second pressure gauge. The first pressure gauge is installed in the sealed chamber and is used to test the air pressure in the sealed chamber. The second pressure gauge is installed in the hydrogen storage tank and is used to test the air pressure in the hydrogen storage tank.

[0037] When the sliding column moves toward the inner side of the hydrogen storage tank and moves the driving rod, the first sealing plug is released from the state of abutting against the inner wall of the hydrogen storage tank. At this time, the high-pressure hydrogen in the hydrogen storage tank enters the test seat through the connecting groove. By observing the pressure changes of the second pressure gauge, it is analyzed whether the high-pressure hydrogen is leaking from the O-ring and the inner wall of the test seat. In addition, after the sealing cover and the end face of the sealing chamber are abutted, when high-pressure hydrogen leaks into the connecting cavity, the first pressure gauge can test the air pressure changes in the connecting cavity, and thus determine whether the O-ring is leaking.

[0038] Technical effects and advantages of the present invention:

[0039] 1. The present invention is provided with a sliding post, a sealing component, a testing component and a translation component. The translation component drives the sliding post to move toward the inner side of the hydrogen storage tank. At this time, the O-ring is in a moving state in the test seat. After sliding to a certain stroke, the sliding post contacts the sealing component and causes the sealing component to operate, thereby opening the connecting groove, thereby allowing the high-pressure hydrogen in the hydrogen storage tank to enter the test seat through the connecting groove. Since the sliding post is still in a moving state at this time, when the high-pressure hydrogen enters the interior of the test seat, the test component can be used to test the change in the internal air pressure of the hydrogen storage tank when the sliding post is in a moving state. When the sliding post slides into place and is in a stationary state, the test component is used to continuously test the change in the internal air pressure of the hydrogen storage tank in a stationary state, thereby analyzing the sealing performance of the O-ring in both stationary and moving states. Since the high-pressure hydrogen can be automatically allowed to enter the test seat by sliding the sliding post, the sealing performance of the O-ring can be tested by the change in the air pressure in the hydrogen storage tank. The operation is convenient and no human intervention is required.

[0040] 2. The present invention provides a driving rod, a first sealing plug, and an elastic driving structure. When the sliding column moves toward the inside of the hydrogen storage tank in the test seat, after sliding to a certain stroke, the end face of the sliding column will abut against the end of the driving rod that passes through the hydrogen storage tank. As the sliding column continues to move, the driving rod will move toward the inside of the hydrogen storage tank and overcome the elastic supporting force of the elastic driving structure, thereby causing the first sealing plug to break away from the abutment state with the inner wall of the hydrogen storage tank. At this time, the high-pressure hydrogen in the hydrogen storage tank can enter the test seat through the connecting groove. Since no human intervention is required, only the sliding column needs to be moved to allow the high-pressure hydrogen to enter the test seat, making the operation more convenient.

[0041] 3. The present invention provides a second sealing plug. When the driving rod is pushed by the sliding column and moves toward the inside of the hydrogen storage tank, the first sealing plug is released from the state of abutting against the inner wall of the hydrogen storage tank, so that the connecting groove is opened, and the second sealing plug abuts against the inner wall of the hydrogen storage tank, thereby preventing the external high-pressure hydrogen delivery system from continuing to deliver high-pressure hydrogen to the interior of the hydrogen storage tank. This avoids errors in the test accuracy of the test component caused by continuous delivery of high-pressure hydrogen to the hydrogen storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of the overall structure of an O-ring sealing performance testing device under a high-pressure hydrogen environment according to the present invention;

[0043] Figure 2 This is a schematic cross-sectional view of a device for testing the sealing performance of an O-ring in a high-pressure hydrogen environment according to the present invention;

[0044] Figure 3 for Figure 2 A magnified schematic diagram of the local structure at point A;

[0045] Figure 4 A schematic side view of the overall structure of an O-ring sealing performance testing device in a high-pressure hydrogen environment according to the present invention;

[0046] Figure 5 It is a schematic front view of the structure of an O-ring sealing performance testing device in a high-pressure hydrogen environment of the present invention;

[0047] Figure 6 This is a schematic cross-sectional view from a front view of a device for testing the sealing performance of an O-ring in a high-pressure hydrogen environment according to the present invention;

[0048] Figure 7 This is a schematic diagram of the connection structure between the second rack column and the drive rod in an O-ring sealing performance testing device under a high-pressure hydrogen environment of the present invention;

[0049] Figure 8 This is a schematic structural diagram of a hydrogen storage tank in a device for testing the sealing performance of an O-ring in a high-pressure hydrogen environment according to the present invention;

[0050] Figure 9 This is a schematic diagram of the partial cross-sectional structure of a hydrogen storage tank in an O-ring sealing performance testing device under a high-pressure hydrogen environment of the present invention.

[0051] The accompanying drawings are marked as follows: 1-test base, 2-cylinder, 3-sealing cover, 4-first pressure gauge, 5-sealing chamber, 6-test seat, 7-vacuum chamber, 8-hydrogen storage tank, 9-second pressure gauge, 10-gas delivery port, 11-second sealing plug, 12-first gear, 13-driving rod, 14-second rack column, 15-pull rod, 16-first rack column, 17-arc gear, 18-second gear, 19-piston, 20-sliding column, 21-connecting chamber, 22-connecting column, 23-first sealing plug, 24-connecting groove, 25-spring, 26-fixing sleeve, 27-sliding block, 28-O-ring. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0053] like Figure 1-9As shown, the present invention provides an O-ring sealing performance test device under a high-pressure hydrogen environment, including a test base 1, one end of the test base 1 in the length direction is screwed to a hollow hydrogen storage tank 8, the hydrogen storage tank 8 is provided with a gas delivery port 10 connected to a high-pressure hydrogen delivery system, the high-pressure hydrogen delivery system delivers high-pressure hydrogen from the gas delivery port 10 to the hydrogen storage tank 8, the end of the hydrogen storage tank 8 away from the gas delivery port 10 is screwed to a test base 6, the test base 6 is hollow inside, a connecting groove 24 that penetrates the inside of the test base 6 is provided on the outer wall of the hydrogen storage tank 8, a sealing chamber 5 is coaxially integrally formed or welded on the test base 6, a connecting cavity 21 that is connected to the test base 6 is provided in the sealing chamber 5, and a sliding column 20 is engaged in the test base 6 and slides The column 20 forms a sliding fit with the interior of the test seat 6, and a mounting groove for installing the O-ring 28 is coaxially opened on the periphery of the sliding column 20. A cylinder 2 is horizontally installed at the other end of the length direction of the test base 1 through a bracket. A connecting column 22 is coaxially threaded or welded on the cylinder rod of the cylinder 2. One end of the connecting column 22 penetrates into the sealing chamber 5 and is coaxially connected to the sliding column 20. In addition, one end of the connecting column 22 exposed from the communicating cavity 21 is fixedly covered with a sealing cover 3, and the outer diameter of the sealing cover 3 is larger than the outer diameter of the sealing chamber 5. In addition, the cylinder 2 is actuated by an external solenoid valve controller. When the solenoid valve is started, the cylinder rod of the cylinder 2 extends, thereby driving the connecting column 22 to drive the sliding column 20 to slide toward the inner side of the hydrogen storage tank 8, and the connecting column 22 moves into place After that, the end face of the sealing cover 3 is against the end face of the sealing chamber 5, and the interior of the communicating chamber 21 can be sealed. In addition, a second pressure gauge 9 is installed on the outer wall of the hydrogen storage tank 8, and the second pressure gauge 9 is used to test the air pressure value in the hydrogen storage tank 8. In addition, a first pressure gauge 4 is installed on the outer wall of the sealing chamber 5, and the first pressure gauge 4 is used to test the air pressure value inside the sealing chamber 5. When testing, the cylinder rod of the cylinder 2 is extended, thereby driving the sliding column 20 to slide into the test seat 6, and the O-ring 28 is squeezed by the inner wall of the test seat 6 and deformed, thereby sealing the gap between the sliding column 20 and the inner wall of the test seat 6. At the same time, as the connecting column 22 continues to move, until the sealing cover 3 can be against the end face of the sealing chamber 5, the interior of the communicating chamber 21 is tested. To seal, the external high-pressure hydrogen delivery system delivers high-pressure hydrogen from the gas delivery port 10 to the hydrogen storage tank 8 through the pipeline. At this time, the second pressure gauge 9 displays the hydrogen pressure value in the hydrogen storage tank 8, and the first pressure gauge 4 displays the air pressure value in the connecting cavity 21 of the sealing chamber. Then the high-pressure hydrogen enters the test seat 6 through the connecting groove 24. During the sliding process of the sliding column 20 in the test seat 6, if the sealing performance of the O-ring 28 meets the standard, the pressure value of the second pressure gauge 9 changes in a small range, and the air pressure value inside the first pressure gauge 4 does not change much. On the contrary, when the sealing performance of the O-ring 28 does not meet the standard, the pressure value of the second pressure gauge 9 decreases significantly, and the air pressure value of the first pressure gauge 4 increases. In this way, it can be determined that the sealing effect of the O-ring 28 does not meet the standard;

[0054] Before the sliding column 20 enters the test seat 6, it is necessary to ensure that the hydrogen in the hydrogen storage tank 8 will not leak. At the same time, it is also necessary to ensure that after the sliding column 20 moves a certain distance toward the inside of the hydrogen storage tank 8, the high-pressure hydrogen in the hydrogen storage tank 8 can enter the test seat 6 through the connecting groove 24. Figure 2 、 3 6, in this embodiment, a fixing sleeve 26 is welded on the outer wall of the hydrogen storage tank 8, the fixing sleeve 26 is located in the test seat 6, and the interior of the fixing sleeve 26 is hollow. A driving rod 13 is penetrated on the outer wall of the hydrogen storage tank 8 by installing a dynamic sealing ring. One end of the driving rod 13 penetrates into the test seat 6, and the driving rod 13 can slide freely on the outer wall of the hydrogen storage tank 8. The portion of the driving rod 13 located in the hydrogen storage tank 8 is fixedly covered with a first sealing plug 23. The side projection area of ​​the first sealing plug 23 can cover the communicating groove 24. The driving rod 13 can slidably pass through the fixing sleeve 26, and when the sliding column 20 moves toward the inner side of the hydrogen storage tank 8, it can pass through the fixing sleeve 26 with the driving rod 13. The first sealing plug 23 is pressed against the inner wall of the hydrogen storage tank 8, and the ... The gas enters the test seat 6 through the connecting groove 24 and leaks, and in the initial state, the end of the driving rod 13 is exposed from the fixed sleeve 26. When the cylinder rod of the cylinder 2 extends and drives the sliding column 20 to move toward the test seat 6, when the end face of the sliding column 20 contacts the end of the driving rod 13 exposed from the fixed sleeve 26, as the sliding column 20 continues to move, the driving rod 13 will move toward the inner side of the hydrogen storage tank 8, thereby causing the sliding block 27 to compress the spring 25. At the same time, the first sealing plug 23 can be separated from the state of abutting against the inner wall of the hydrogen storage tank 8. At this time, the high-pressure hydrogen in the hydrogen storage tank 8 can enter the test seat 6 through the connecting groove 24, and then by observing the value change of the second pressure gauge 9, the pressure can be measured. It is possible to analyze the pressure change of the hydrogen storage tank 8, and thus analyze the sealing performance of the O-ring 28 in a moving state. When the sliding column 20 moves into place, the sealing cover 3 abuts against the end face of the sealing chamber 5 and remains stationary for a certain period of time. By observing the pressure value changes of the first pressure gauge 4 and the second pressure gauge 9, it is possible to analyze the pressure change of the high-pressure hydrogen in the hydrogen storage tank 8 and the pressure change in the sealing chamber 5. When the value of the first pressure gauge 4 increases and the value of the second pressure gauge 9 decreases, it can be determined that the sealing performance of the O-ring 28 does not meet the standard. On the contrary, when the value of the first pressure gauge 4 does not change much and the value of the second pressure gauge does not change much either, it can be determined that the sealing performance of the O-ring 28 is good.

[0055] During the test, the external high-pressure hydrogen delivery system may continue to deliver high-pressure hydrogen to the inside of the hydrogen storage tank 8 through the gas delivery port 10, which may cause the value of the second pressure gauge 9 to change slightly, thereby causing a misjudgment of the test result. Figure 2 、 3 As shown in Figures 6 and 7, in this embodiment, a second sealing plug 11 is fixedly mounted on one end of the driving rod 13 that penetrates into the hydrogen storage tank 8. When the first sealing plug 23 moves toward the inner side of the hydrogen storage tank 8, the second sealing plug 11 can close the gas transmission port 10. When the driving rod 13 is in the initial state, the first sealing plug 23 is against the inner wall of the hydrogen storage tank 8. At this time, the second sealing plug 11 is separated from the state of being against the inner wall of the hydrogen storage tank 8. When the driving rod 3 is pushed toward the inner side of the hydrogen storage tank 8 by the sliding column 20, the first sealing plug 23 is separated from the state of being against the inner wall of the hydrogen storage tank 8, so that the connecting groove 24 is opened, and the second sealing plug 11 will be against the inner wall of the hydrogen storage tank 8, thereby preventing the external high-pressure hydrogen delivery system from continuing to deliver high-pressure hydrogen to the inside of the hydrogen storage tank 8, thereby avoiding affecting the determination of the pressure value in the hydrogen storage tank 8 when the high-pressure hydrogen is continuously delivered to the hydrogen storage tank 8.

[0056] Since the sealing cover 3 and the end surface of the sealing chamber 5 are in contact with each other, if the sealing performance of the O-ring 28 is not up to standard, the high-pressure hydrogen will enter the connecting cavity 21 of the sealing chamber 5 from the inside of the test seat 6, thereby increasing the air pressure in the connecting cavity 21. When the air pressure increases to a certain level, the air pressure in the test seat 6 and the connecting cavity 21 will be consistent. At this time, the value change of the first pressure gauge 4 cannot be observed, thereby affecting the judgment. Therefore, if Figure 2 、 6As shown, in this embodiment, a vacuum chamber 7 is connected to the sealing chamber 5 through a connecting pipe, and the vacuum chamber 7 is open to one side of the hydrogen storage tank 8. In addition, a piston 19 is engaged in the vacuum chamber 7, and the piston 19 and the interior of the vacuum chamber 7 form a sliding fit. When the drive rod 13 moves toward the inside of the hydrogen storage tank 8, it can drive the piston 19 to move toward the inside of the hydrogen storage tank 8. Specifically, a pull rod 15 is coaxially fixed to the piston 19, and the end of the pull rod 15 away from the piston 19 can be slidably inserted into the hydrogen storage tank 8. The pull rod 15 and the drive rod 13 are respectively fixed on the parts inside the hydrogen storage tank 8. The fixed set is equipped with a first rack column 16 and a second rack column 14. The inner wall of the hydrogen storage tank 8 is rotated in sequence to connect the first gear 12 and the second gear 18. The first gear 12 and the second gear 18 are in a meshing state, and the first gear 12 is meshed with the outside of the second rack column 14. The second gear 18 is connected to an arc gear 17 through a swing arm. The arc gear 17 is meshed with the outside of the first rack column 16. When the drive rod 13 moves toward the inside of the hydrogen storage tank 8, the arc gear 17 can be meshed with the first rack column 16, and the drive rod 15 moves toward the inside of the hydrogen storage tank 8. By sliding The column 20 moves toward the inner side of the hydrogen storage tank 8 until it contacts the end of the drive rod 13, and can drive the drive rod 13 to slide toward the inner side of the hydrogen storage tank 8. The drive rod 13 can drive the second rack column 14 to move. When the second rack column 14 moves, it will drive the first gear 12 to rotate. The first gear 12 is meshed with the second gear 18 for transmission, and then the arc gear 17 can be driven to rotate. The arc gear 17 is meshed with the first rack column 12. At the same time, the movement directions of the first rack column 12 and the second rack column 14 are the same, so the pull rod 15 will drive the piston 19 toward the storage tank. The hydrogen tank 8 moves inward, and the piston 19 can draw the air in the connecting chamber 21 into the vacuum chamber 7. Since the molecular weight of the air in the connecting chamber 21 remains unchanged and the volume increases, the air pressure in the connecting chamber 21 decreases. When the sealing performance of the O-ring 28 is low, high-pressure hydrogen will enter the connecting chamber 21. At this time, the air pressure change in the connecting chamber can be quickly tested by the first pressure gauge 4. As the high-pressure hydrogen continues to enter the connecting chamber 21, the value of the first pressure gauge 4 changes more obviously, thereby avoiding affecting the staff's judgment on the value change of the first pressure gauge 4.

[0057] Since the sliding column 20 pushes against the driving rod 13 and moves in a short stroke, the horizontal movement stroke of the pull rod is also short, thereby affecting the effect of the piston on the air extraction in the communicating chamber 21. Figure 2 、 6As shown, in this embodiment, by setting the nominal diameter of the first gear 12 to be at least twice the nominal diameter of the second gear 18, when the first gear 12 rotates, it drives the second gear to rotate, and the angular stroke of the second gear is greater than the angular stroke of the first gear, so that the arc gear 17 drives the pull rod to move with a larger stroke. In this way, when the moving stroke of the drive rod is small, the translation stroke of the pull rod can still be large, so that the piston has sufficient sliding stroke and the air pressure in the connecting cavity can be greatly reduced.

[0058] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "Up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute positions of the objects being described change, the relative positional relationships may also change.

[0059] Secondly: The drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures may refer to conventional designs. The same embodiment and different embodiments of the present invention may be combined with each other without conflict.

[0060] Finally: The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for testing the sealing performance of an O-ring in a high-pressure hydrogen environment, characterized in that: include: Test base (1); A hydrogen storage tank (8) is installed at one end of the test base (1), and a gas delivery port (10) connected to a high-pressure hydrogen delivery system is provided on the hydrogen storage tank (8); A test seat (6) is connected to an end of the hydrogen storage tank (8) away from the gas transmission port (10), the interior of the test seat (6) is hollow, and a connecting groove (24) is provided on the outer wall of the hydrogen storage tank (8) and is connected to the interior of the test seat (6); A sealed chamber (5) is coaxially connected to the test seat (6), and a communication cavity (21) communicating with the test seat (6) is provided in the sealed chamber (5); A sliding column (20) is engaged with the test seat (6) and forms a sliding fit with the inside of the test seat (6); a mounting groove for mounting an O-ring (28) is coaxially provided on the periphery of the sliding column (20); and the sliding column (20) is driven by a translation component to move toward the inside of the hydrogen storage tank (8); A sealing component is used to close the communication groove (24) in an initial state, and when the sliding column (20) moves toward the hydrogen storage tank (8), the communication groove (24) is opened, so that the high-pressure hydrogen in the hydrogen storage tank (8) can enter the test seat (6); A testing component, used to test the pressure change in the hydrogen storage tank (8) after the communicating groove (24) is opened; The sealing component includes: A driving rod (13) is horizontally arranged in the hydrogen storage tank (8), and one end of the driving rod is inserted into the test seat (6), and the driving rod (13) can slide freely on the outer wall of the hydrogen storage tank (8); A first sealing plug (23) is fixedly mounted on a portion of the driving rod (13) located inside the hydrogen storage tank (8), wherein a side projection area of ​​the first sealing plug (23) can cover the connecting groove (24); An elastic driving structure, used for driving the driving rod (13) to slide toward the outside of the hydrogen storage tank (8) in an initial state, and causing the first sealing plug (23) to abut against the inner wall of the hydrogen storage tank (8), thereby sealing the communicating groove (24); The sealing chamber (5) is connected to an air pumping chamber (7) through a connecting pipe. A piston (19) is engaged in the air pumping chamber (7). The piston (19) and the interior of the air pumping chamber (7) form a sliding fit. When the driving rod (13) moves toward the inside of the hydrogen storage tank (8), it can drive the piston (19) to move toward the inside of the hydrogen storage tank (8). A pull rod (15) is coaxially fixed to the piston (19), and the end of the pull rod (15) away from the piston (19) can be slidably inserted into the hydrogen storage tank (8). The pull rod (15) and the driving rod (13) are respectively fixedly mounted with a first rack column (16) and a second rack column (14) on the parts of the pull rod (15) and the driving rod (13) located in the hydrogen storage tank (8). The inner wall of the hydrogen storage tank (8) is rotatably connected to the first gear (12) and the second gear (18). The first gear (12) and the second gear ( 18) is in a meshing state, and the first gear (12) is externally meshed with the second rack column (14), the second gear (18) is connected to an arc gear (17) via a swing arm, the arc gear (17) is externally meshed with the first rack column (16), and when the driving rod (13) moves toward the inside of the hydrogen storage tank (8), the arc gear (17) is meshed with the first rack column (16), and the pull rod (15) is driven to move toward the inside of the hydrogen storage tank (8).

2. The O-ring sealing performance testing device under high-pressure hydrogen environment according to claim 1, characterized in that: One end of the driving rod (13) that penetrates into the hydrogen storage tank (8) is fixedly sleeved with a second sealing plug (11), and when the first sealing plug (23) moves toward the inside of the hydrogen storage tank (8), the second sealing plug (11) can close the gas transmission port (10).

3. The O-ring sealing performance testing device under high-pressure hydrogen environment according to claim 1, characterized in that: The elastic drive structure includes: A fixed sleeve (26) is fixedly connected to the outer wall of the hydrogen storage tank (8) and is located in the test seat (6); the interior of the fixed sleeve (26) is hollow; the driving rod (13) can slidably pass through the fixed sleeve (26); and when the sliding column (20) moves toward the inner side of the hydrogen storage tank (8), it can abut against one end of the driving rod (13) passing through the fixed sleeve (26); A sliding block (27) is engaged with the fixed sleeve (26) and forms a sliding fit with the inner wall of the fixed sleeve (26), and the sliding block (27) is fixedly sleeved on one end of the driving rod (13) that penetrates into the fixed sleeve (26); The spring (25) is sleeved on the driving rod (13), and the two ends in the direction of elastic force elastically press against the sliding block (27) and the outer wall of the hydrogen storage tank (8).

4. The O-ring sealing performance testing device under high-pressure hydrogen environment according to claim 1, characterized in that: The nominal diameter of the first gear (12) is at least twice the nominal diameter of the second gear (18).

5. The O-ring sealing performance testing device under high-pressure hydrogen environment according to claim 1, characterized in that: The translation component comprises a cylinder (2) mounted horizontally on a test base (1) via a mounting bracket, wherein a cylinder rod of the cylinder (2) is connected to a sliding column (20).

6. The O-ring sealing performance testing device under high-pressure hydrogen environment according to claim 1, characterized in that: The test components include: A connecting post (22) coaxially connected to the sliding post (20); A sealing cover (3) is coaxially fixedly sleeved on one end of the connecting column (22) passing through the communicating cavity (21), and the sealing cover (3) is capable of sealing the communicating cavity (21) after abutting against the end surface of the sealing chamber (5); The two pressure gauges are defined as a first pressure gauge (4) and a second pressure gauge (9), respectively. The first pressure gauge (4) is installed in the sealed chamber (5) and is used to test the air pressure in the sealed chamber (5), and the second pressure gauge (9) is installed in the hydrogen storage tank (8) and is used to test the air pressure in the hydrogen storage tank (8).

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