Variable volume pressure cycle hydrogen seal material performance test bench

Abstract

The present application relates to the technical field of test device, provide a kind of variable volume pressure cycle hydrogen seal material performance test platform, including test box, driving device and transmission device, test box includes box and sealing cover, box is open at one end, sealing cover side is equipped with the containing slot for accommodating test piece, sealing cover is movably arranged in the open end of box, sealing cover can be switched between first position and second position, the volume of test box when sealing cover is in first position is greater than the volume of test box when sealing cover is in second position;Driving device provides power for the position switching of sealing cover;Transmission device drives sealing cover to move at uniform speed and can change the angle of sealing cover.Such setting, the alternative switching of sealing cover position, angle is realized by driving device and transmission device, the volume of test box and the internal pressure of alternative, variable speed change are realized, without complex control process, control process is significantly simplified, maintenance and test cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of test devices, in particular to a variable volume pressure cycle hydrogen sealing material performance test bench. Background Art

[0002] Hydrogen sealing rings often experience cyclic loads. Such working conditions are encountered in hydrogen application fields such as fuel cells, hydrogen storage systems, chemical plants and hydrogen transportation pipelines. The operation of equipment is usually accompanied by frequent changes in pressure and temperature, causing hydrogen sealing materials to withstand repeated expansion, compression and shear stress. Cyclic loads will affect the mechanical properties and chemical stability of hydrogen sealing materials. Hydrogen sealing materials must have good elasticity and recovery to cope with repeated changes in pressure, and have high fatigue resistance to avoid cracks or deformation of the material due to cyclic stress. In addition, due to the high permeability of hydrogen molecules and the possible hydrogen embrittlement, hydrogen sealing materials also need to have strong resistance to hydrogen to prevent material degradation and failure.

[0003] The pressure-scaling test of the sealing ring is of great significance to the cyclic load performance of the hydrogen sealing ring. It is an indispensable test link in hydrogen sealing technology and is crucial to the development of efficient and safe sealing rings. This type of experiment is designed to simulate the pressure changes that the sealing ring may experience under actual working conditions, and evaluate the durability and reliability of the sealing ring through repeated cycles of pressurization and decompression. In hydrogen sealing applications, the sealing ring must withstand multiple pressure cycles without performance degradation or leakage. Because of the high permeability and flammability of hydrogen, the sealing system must have extremely high integrity. Through the pressure-scaling test, the sealing effect of the sealing ring under different pressure conditions and the elastic recovery ability of the material can be detected, helping to identify weak links that may cause leakage, ensuring the stable performance of the sealing ring in a dynamic pressure change environment, predicting its service life and maintenance requirements, and thus improving the overall safety and reliability of the system.

[0004] In the existing technology, pressure changes can be achieved in a variety of ways. The commonly used pressure source is the hydraulic system, which uses boosting devices such as booster pumps and booster gas cylinders to increase the system pressure, and controls the flow of gas or liquid through regulating devices such as pressure regulating valves, pressure reducing valves and pressure regulators to adjust the pressure and the speed of pressure change. The pressure is automatically adjusted using PLC or sensor feedback. The system structure is complex, the control process is cumbersome, and the maintenance and testing costs are high.

[0005] Therefore, how to solve the problems of complicated control process, high maintenance and testing costs of the transformer test device in the prior art has become an important technical problem to be solved by those skilled in the art. Summary of the Invention

[0006] The present invention provides a variable volume pressure circulating hydrogen sealing material performance test bench, which is used to solve the defects of the variable pressure test device in the prior art, such as complicated control process, high maintenance and testing costs.

[0007] The present invention provides a variable volume pressure cycle hydrogen sealing material performance test bench, comprising:

[0008] A test box includes a box body and a sealing cover. The box body has a receiving cavity inside and is open at one end. The sealing cover is provided with a receiving groove for receiving a test piece on its circumference. The sealing cover is movably disposed at the open end of the box body and is switchable between a first position and a second position. The volume of the test box when the sealing cover is in the first position is greater than the volume of the test box when the sealing cover is in the second position.

[0009] a driving device, disposed outside the test box, adapted to provide power for position switching of the sealing cover;

[0010] The transmission device is arranged between the sealing cover and the driving device. The transmission device is suitable for driving the sealing cover to move at a constant speed and can change the angle of the sealing cover.

[0011] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the sealing cover is slidably matched with the box body, and the transmission device includes:

[0012] A fixed frame, fixedly connected to the output end of the driving device, wherein the fixed frame moves closer to or farther from the box under the action of the driving device;

[0013] A fixed-length rod and a telescopic rod are arranged between the fixed frame and the sealing cover, the fixed-length rod and the telescopic rod are distributed along a first direction, a group of fixed-length rods are provided, and a group of fixed-length rods are distributed along a third direction, and the third direction is perpendicular to the first direction, a group of telescopic rods are provided, and a group of telescopic rods are distributed along the third direction, the first end of the fixed-length rod and the first end of the telescopic rod are both connected to the fixed frame, and the second end of the fixed-length rod and the second end of the telescopic rod are both movably connected to the sealing cover, so that the angle of the sealing cover relative to the fixed-length rod and the angle of the sealing cover relative to the telescopic rod are variable.

[0014] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the transmission device further includes:

[0015] a limiting member fixed relative to the box body, the limiting member being adapted to limit the displacement of the telescopic rod and the fixed-length rod along the first direction;

[0016] A connecting seat, the second end of each fixed-length rod and the second end of each telescopic rod are connected to the sealing cover through the connecting seat, the connecting seat can at least rotate relative to the fixed-length rod and the telescopic rod around a straight line parallel to the third direction, the connecting seat is slidably connected to the sealing cover, and when the connecting seat slides relative to the sealing cover, it has a sliding component parallel to the sealing cover and perpendicular to the third direction.

[0017] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, a circular slide groove is provided on the sealing cover, and each of the connecting seats is embedded in the circular slide groove;

[0018] The fixed-length rod and the telescopic rod are each provided in a pair, the first end of the telescopic rod and the first end of the fixed-length rod are both capable of rotating at least about a straight line parallel to the first direction, and the second end of the telescopic rod and the second end of the fixed-length rod are both universally connected to the connecting seat;

[0019] The limiting member is provided with a first sliding hole and a second sliding hole, and the first sliding hole and the second sliding hole both penetrate the limiting member along a second direction, and the second direction is perpendicular to the first direction and the third direction. The telescopic rod penetrates the first sliding hole, and the first sliding hole allows the telescopic rod to swing around a straight line parallel to the first direction. The fixed-length rod penetrates the second sliding hole, and the second sliding hole allows the fixed-length rod to swing around a straight line parallel to the first direction.

[0020] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the transmission device further includes:

[0021] The first connecting rod and the second connecting rod are cross-arranged and are both rotatably connected to the sealing cover. The first connecting rod and the second connecting rod are arranged along the second direction relative to the rotation axis of the sealing cover and the rotation axis of the second connecting rod relative to the sealing cover, and pass through the center of the circular slide groove. The two ends of the first connecting rod are respectively connected to one of the connecting seats, and the two ends of the second connecting rod are respectively connected to one of the connecting seats.

[0022] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the telescopic rod includes:

[0023] a first rod body, slidably engaged with the limiting member, wherein the sliding direction of the first rod body relative to the limiting member is along the axis direction of the first rod body, and a first end of the first rod body is connected to the fixing frame;

[0024] a second rod body, slidingly engaged with the first rod body and the limiting member, wherein the sliding direction of the second rod body relative to the first rod body and the limiting member is along the axis direction of the second rod body, and the second end of the second rod body is connected to the connecting seat;

[0025] a third elastic member, disposed between the first rod and the second rod, the third elastic member being adapted to cause the second rod to tend to approach the fixing frame;

[0026] The sliding control mechanism can switch between an avoidance state and a limit state. In the avoidance state, the second rod body can slide relative to the limit member in a second direction, and the second direction is perpendicular to the first direction and the third direction. In the limit state, the sliding control mechanism limits the second rod body from sliding in a direction close to the fixed frame.

[0027] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the sliding control mechanism includes:

[0028] a rotating disk, perpendicular to the first direction, capable of rotating relative to the box around a straight line parallel to the first direction under a force;

[0029] and a second stopper, wherein the first end of the second stopper is rotatably arranged on a side of the rotating disk facing the second rod body, and the second stopper is perpendicular to the first direction relative to the rotation axis of the rotating disk, and the second end of the second stopper is provided with a free end on the second rod body, and a second inclined surface and an abutting portion are provided on the second rod body, and the second inclined surface is parallel to the third direction, and the distance between the second inclined surface and the rotating disk gradually decreases in a direction away from the fixed frame, and the abutting portion is located at an end of the second inclined surface away from the fixed frame, and the rotating disk is capable of rotating between an avoidance position and an abutting position, in which the projection of the second end of the second stopper along the first direction is located outside a trajectory of the abutting portion sliding with the second rod body, and in the abutting position, the projection of the second end of the second stopper along the first direction is located within a trajectory of the abutting portion sliding with the second rod body;

[0030] The rotation drive assembly is adapted to drive the rotating disk to rotate between the avoidance position and the abutment position.

[0031] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the rotation drive assembly includes:

[0032] a first stopper, wherein a first end of the first stopper is rotatably disposed on a side of the rotating disk facing the first rod body, the first stopper is perpendicular to the first direction relative to the rotation axis of the rotating disk, and a second end of the first stopper is a free end;

[0033] a driving portion disposed at the second end of the first rod, the driving portion being located on one side of the first rod along the third direction, the surface of the driving portion away from the first rod being a first inclined surface, and the distance between the first inclined surface and the central axis of the first rod gradually increasing in a direction away from the fixing frame;

[0034] The fourth elastic member is disposed between the rotating disk and the limiting member, and the fourth elastic member is adapted to cause the rotating disk to rotate toward the abutting position.

[0035] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the test box further includes:

[0036] a first sliding member slidably connected to the first side wall of the box body, wherein the sliding direction of the first sliding member relative to the first side wall is along a second direction, the second direction being perpendicular to the first direction and the third direction, and the first side wall is located on a side of the telescopic rod away from the fixed-length rod;

[0037] a first elastic member disposed between the first sliding member and the first side wall, the first elastic member being adapted to cause the first sliding member to tend to approach the open end of the box body;

[0038] a second sliding member slidably connected to a second side wall of the box body, wherein a sliding direction of the second sliding member relative to the second side wall is along the second direction, and the second side wall is located on a side of the fixed-length rod away from the telescopic rod;

[0039] The second elastic member is disposed between the second sliding member and the second side wall, and the second elastic member is adapted to cause the second sliding member to have a tendency to move away from the open end of the box body.

[0040] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, a side surface of the first sliding member close to the second side wall is a first arcuate surface, and the distance between the first arcuate surface and the second side wall gradually increases in a direction close to the fixing frame;

[0041] A side surface of the second sliding member close to the first side wall is a second arc-shaped surface, and a distance between the second arc-shaped surface and the first side wall gradually decreases in a direction close to the fixing frame.

[0042] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the box includes:

[0043] An inner box body and an outer box body, wherein the outer box body is sleeved on the outside of the inner box body, one end of each of the outer box body and the inner box body is open, and the inner box body is suitable for cooperating with the sealing cover;

[0044] The shock-absorbing layer is arranged between the outer box and the inner box.

[0045] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the box body is provided with a filling port for filling the box body with a medium, and the test box further includes:

[0046] A blocking piece is used to block the filling port, and the blocking piece is detachably sealed to the box body.

[0047] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the driving device includes:

[0048] a rack, wherein the axis of the rack is parallel to the opening direction of the box body, and the rack is suitable for approaching or moving away from the box body;

[0049] A gear, capable of rotating about a fixed axis, and meshing with the rack for transmission;

[0050] a driving member, in transmission connection with the gear;

[0051] Wherein, when there are at least two test boxes, each gear corresponds to two racks, each rack is connected to one transmission device, and there are at least two gears, and each gear is coaxially fixed.

[0052] The variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention includes a test box, a drive device and a transmission device. The test box includes a box body and a sealing cover. The box body has a receiving cavity inside, and one end of the box body is open. The sealing cover is provided with a receiving groove on the circumference of the box body, and the receiving groove is used to receive the test piece. The sealing cover can be movably arranged at the open end of the box body, and the test piece is located between the sealing cover and the box body. The mating position of the sealing cover and the box body can be sealed so that the sealing cover and the box body enclose a sealed cavity. The sealing cover can be switched between a first position and a second position. The volume of the test box when the sealing cover is in the first position is greater than the volume of the test box when the sealing cover is in the second position. By switching the sealing cover alternately between the first position and the second position, the volume of the test box can be alternatingly changed, thereby achieving alternating changes in the pressure inside the test box. The drive device is disposed outside the test chamber, and the transmission device is disposed between the sealing cover and the drive device. The drive device is used to provide power for switching the position of the sealing cover, and the transmission device is used to drive the sealing cover to move at a constant speed and can change the angle of the sealing cover, thereby causing the volume of the test chamber to change at a variable speed, and thus the internal pressure of the test chamber to change at a variable speed. This arrangement enables the drive device and transmission device to achieve alternating switching of the position and angle of the sealing cover, alternating and varying the volume of the test chamber, and alternating and varying the internal pressure of the test chamber, without requiring a complex control process. This significantly simplifies the control process, reduces maintenance and testing costs, and solves the problems of cumbersome control processes and high maintenance and testing costs in prior art variable pressure test devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0054] Figure 1 It is a structural schematic diagram of the variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention.

[0055] Figure 2 It is a structural schematic diagram of the variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention when the sealing cover is in the second position.

[0056] Figure 3 It is a structural schematic diagram of the variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention when the sealing cover is in a position between the first position and the second position.

[0057] Figure 4It is a structural schematic diagram of the transmission device provided by the present invention when the telescopic rod is in a retracted state.

[0058] Figure 5 It is a front view of the transmission device provided by the present invention when the telescopic rod is in a retracted state.

[0059] Figure 6 It is a structural schematic diagram of the transmission device provided by the present invention when the telescopic rod is in an extended state.

[0060] Figure 7 It is a front view of the transmission device provided by the present invention when the telescopic rod is in an extended state.

[0061] Figure 8 yes Figure 6 Enlarged view of point I in the middle.

[0062] Figure 9 It is a structural schematic diagram of the first stopper, the second stopper and the rotating disk provided by the present invention.

[0063] Figure 10 It is a structural schematic diagram of the sliding control mechanism provided by the present invention when it is in a limited state at one viewing angle (the rotating disk is not shown).

[0064] Figure 11 This is a structural schematic diagram of the sliding control mechanism provided by the present invention when it is in a limited state from another perspective (the rotating disk is not shown).

[0065] Figure 12 It is a structural schematic diagram of the sliding control mechanism provided by the present invention when it is in an avoidance state at one viewing angle (the rotating disk is not shown).

[0066] Figure 13 This is a structural schematic diagram of the sliding control mechanism provided by the present invention when it is in an avoidance state from another perspective (the rotating disk is not shown).

[0067] Figure 14 It is a cross-sectional view of the test box provided by the present invention when the sealing cover is in the second position.

[0068] Figure 15 It is a cross-sectional view of the test box provided by the present invention when the sealing cover is in a position between the first position and the second position.

[0069] Figure 16 It is a cross-sectional view of the box provided by the present invention.

[0070] Figure 17 It is a partial structural schematic diagram of the driving device provided by the present invention.

[0071] Reference numerals:

[0072] 1. Test box; 2. Box body; 3. Sealing cover; 4. Fixing frame; 5. Fixed-length rod; 6. Telescopic rod; 7. Limiting piece; 8. Connecting seat; 9. First connecting rod; 10. Second connecting rod; 11. First rod body; 12. Second rod body; 13. Rotating disk; 14. Second stopper; 15. Second inclined surface; 16. Abutting part; 17. First stopper; 18. First inclined surface; 19. First sliding member; 20. Second sliding member; 21. Inner box body; 22. Outer box body; 23. Shock-absorbing layer; 24. Filling port; 25. Rack; 26. Gear; 27. Elastic plate; 28. Rigid plate. DETAILED DESCRIPTION

[0073] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0074] The following combination Figures 1 to 17 The present invention describes a variable volume pressure cycle hydrogen sealing material performance test bench.

[0075] like Figures 1 to 17 As shown, the variable volume pressure cycle hydrogen sealing material performance test bench provided by the embodiment of the present invention includes a test box 1, a driving device and a transmission device.

[0076] Specifically, the test box 1 includes a box body 2 and a sealing cover 3. The box body 2 has a receiving cavity inside, and one end of the box body 2 is open. A receiving groove is provided on the circumferential side of the sealing cover 3, and the receiving groove is used to receive the test piece. The receiving groove extends along the circumference of the sealing cover 3. The test piece can be a sealing material such as a sealing ring. The sealing ring can be sleeved on the sealing cover 3, and the sealing ring is located in the receiving groove. The sealing cover 3 can be movably provided at the open end of the box body 2. The test piece is located between the sealing cover 3 and the box body 2. The mating position of the sealing cover 3 and the box body 2 can be sealed, so that the sealing cover 3 and the box body 2 enclose a sealed cavity.

[0077] The sealing cover 3 can be switched between a first position and a second position. The volume of the test box 1 when the sealing cover 3 is in the first position is greater than the volume of the test box 1 when the sealing cover 3 is in the second position. By alternately switching the sealing cover 3 between the first position and the second position, the volume of the test box 1 can be alternately changed, thereby achieving alternate changes in the internal pressure of the test box 1.

[0078] The driving device is arranged on the outside of the test box 1, and the transmission device is arranged between the sealing cover 3 and the driving device. The driving device is used to provide power for the position switching of the sealing cover 3. The transmission device is used to drive the sealing cover 3 to move at a constant speed and can change the angle of the sealing cover 3, so that the volume of the test box 1 changes at a variable speed, thereby causing the internal pressure of the test box 1 to change at a variable speed.

[0079] With such a configuration, the position and angle of the sealing cover 3 are alternately switched through the driving device and the transmission device, and the volume of the test box 1 and the internal pressure of the test box 1 are alternately switched and changed at a variable speed. There is no need for a complicated control process, the control process is significantly simplified, and the maintenance and testing costs are reduced, thus solving the problems of complicated control process and high maintenance and testing costs of the variable pressure test device in the prior art.

[0080] A medium of a certain pressure can be filled in the test box 1. After the variable pressure test is performed on the test piece, the sealing performance of the test piece after the variable pressure test can be determined by monitoring the pressure in the test box 1 and detecting the quality or concentration of the leaked medium after the test, thereby completing the performance test of the test piece.

[0081] The composition of the medium filled into test chamber 1 can be determined based on the actual operating conditions of the test object. For hydrogen sealing rings, hydrogen can be filled into test chamber 1. The hydrogen in test chamber 1 also provides a hydrogen environment for the hydrogen sealing ring, while simultaneously testing hydrogen permeability and potential hydrogen embrittlement to determine the hydrogen sealing ring's resistance to hydrogen.

[0082] It should be noted that the sealing cover 3 comprises an elastic plate 27 and a rigid plate 28. A receiving groove is provided around the elastic plate 27 for mounting the test piece. The elastic plate 27 is capable of a certain degree of elastic deformation, allowing it to maintain a seal with the housing 2 even when the sealing cover 3 changes angle. The rigid plate 28 has a smaller area than the elastic plate 27 and is fixedly connected to the elastic plate 27 to support the elastic plate 27. The transmission device is connected to the rigid plate 28 of the sealing cover 3.

[0083] In this embodiment of the present invention, a filling port 24 is provided on the box body 2, through which a medium can be filled into the box body 2. The test box 1 also includes a sealing member that is detachably sealed to the box body 2 and can be used to seal the filling port 24.

[0084] In the embodiment of the present invention, the sealing cover 3 is slidably matched with the box body 2, and the sealing cover 3 switches between the first position and the second position by sliding.

[0085] The transmission device includes a fixed frame 4, a fixed-length rod 5 and a telescopic rod 6. The fixed frame 4 is fixedly connected to the output end of the driving device. The fixed frame 4 can approach or move away from the box 2 under the action of the driving device.

[0086] Specifically, the variable volume pressure cycle hydrogen sealing material performance test bench can be equipped with a support frame so that the fixing frame 4 is slidably connected to the support frame, and the fixing frame 4 is arranged along the second direction relative to the sliding direction of the support frame, which can improve the stability of the transmission device.

[0087] The fixed length rod 5 and the telescopic rod 6 are arranged between the fixing frame 4 and the sealing cover 3, and the fixed length rod 5 and the telescopic rod 6 are distributed along the first direction. Figure 1 The direction indicated by z in the figure, the second direction and the third direction are perpendicular to the first direction; the second direction is parallel to the opening direction of the box 2, refer to Figure 1 The direction indicated by y in the middle; the third direction is perpendicular to the second direction, and the third direction is referenced Figure 1 The direction indicated by x.

[0088] A group of fixed-length rods 5 is provided, and a group of fixed-length rods 5 may include one fixed-length rod 5, two fixed-length rods 5, or multiple fixed-length rods 5. The fixed-length rods 5 of a group are distributed along the third direction.

[0089] The telescopic rod 6 is provided with a group, and a group of telescopic rods 6 may include one telescopic rod 6, two telescopic rods 6, or multiple telescopic rods 6. Each telescopic rod 6 of a group is distributed along the third direction.

[0090] The first end of the fixed-length rod 5 and the first end of the telescopic rod 6 are both connected to the fixed frame 4, and the second end of the fixed-length rod 5 and the second end of the telescopic rod 6 are both movably connected to the sealing cover 3 to allow the angle of the sealing cover 3 relative to the fixed-length rod 5 and the angle of the sealing cover 3 relative to the telescopic rod 6 to change, thereby realizing the angle change of the sealing cover 3.

[0091] When the drive device is in operation, the end of the sealing cover 3 corresponding to the fixed-length rod 5 slides at a constant speed relative to the housing 2 under the action of the fixed-length rod 5. The extension and retraction of the telescopic rod 6 causes the length difference between the telescopic rod 6 and the fixed-length rod 5 to change, which in turn causes the sliding speed of the end of the sealing cover 3 corresponding to the telescopic rod 6 to be inconsistent with the sliding speed of the end of the sealing cover 3 corresponding to the fixed-length rod 5, thereby changing the angle of the sealing cover 3.

[0092] In this embodiment, the transmission device further includes a limiting member 7 and a connecting seat 8.

[0093] The limiter 7 is fixed relative to the housing 2 and is used to limit the displacement of the telescopic rod 6 and the fixed-length rod 5 along the first direction. During operation of the variable volume pressure cycle hydrogen sealing material performance test bench, the relative positions of the telescopic rod 6 and the fixed-length rod 5 in the first direction remain unchanged.

[0094] The second end of each fixed-length rod 5 and the second end of each telescopic rod 6 are provided with a connecting seat 8, and the second end of each fixed-length rod 5 is connected to the sealing cover 3 through the connecting seat 8, and the second end of each telescopic rod 6 is also connected to the sealing cover 3 through the connecting seat 8.

[0095] The connecting seat 8 can at least rotate relative to the fixed-length rod 5 and the telescopic rod 6 around a straight line parallel to the third direction, so that the sealing cover 3 can rotate relative to the box body 2 around a straight line parallel to the third direction to achieve a change in the angle of the sealing cover 3.

[0096] Since the relative positions of the fixed-length rod 5 and the telescopic rod 6 in the first direction remain unchanged, that is, the distance between the fixed-length rod 5 and the telescopic rod 6 in the first direction remains unchanged, when the angle of the sealing cover 3 changes, the straight-line distance between the second end of the fixed-length rod 5 and the second end of the telescopic rod 6 changes, that is, the distance between the connecting seat 8 connected to the fixed-length rod 5 and the connecting seat 8 connected to the telescopic rod 6 needs to change.

[0097] Therefore, in this embodiment, the connecting seat 8 is slidably connected to the sealing cover 3. When the connecting seat 8 slides relative to the sealing cover 3, it has a sliding component parallel to the sealing cover 3 and perpendicular to the third direction.

[0098] In this embodiment, a pair of fixed-length rods 5 and telescopic rods 6 are provided, a circular slide groove is provided on the sealing cover 3, and each connecting seat 8 is embedded in the circular slide groove. Each connecting seat 8 can slide along the circular slide groove relative to the sealing cover 3.

[0099] When the connecting seat 8 slides along the circular groove, it also has a sliding component parallel to the sealing cover 3 and parallel to the third direction. That is, the second end of the telescopic rod 6 will be displaced along the third direction relative to the first end of the telescopic rod 6, and the second end of the fixed-length rod 5 will be displaced along the third direction relative to the first end of the fixed-length rod 5. That is, both the telescopic rod 6 and the fixed-length rod 5 will rotate around a straight line parallel to the first direction.

[0100] Therefore, in this embodiment, the first end of the telescopic rod 6 and the first end of the fixed-length rod 5 can both rotate at least around a straight line parallel to the first direction, and the second end of the telescopic rod 6 and the second end of the fixed-length rod 5 are both universally connected to the connecting seat 8.

[0101] In some embodiments, the first end of the telescopic rod 6 and the first end of the fixed-length rod 5 can also be universally connected to the fixed frame 4 to prevent excessive constraint and reduce stress between the telescopic rod 6 and the fixed frame 4, as well as stress between the fixed-length rod 5 and the fixed frame 4. The universal connection can be achieved using a ball joint.

[0102] Regarding the structure of the stopper 7, a first sliding hole and a second sliding hole are provided on the stopper 7, both of which extend through the stopper 7 in the second direction. The telescopic rod 6 passes through the first sliding hole, enabling it to slide relative to the stopper 7 in the second direction. The first sliding hole also allows the telescopic rod 6 to swing about a line parallel to the first direction. The fixed-length rod 5 passes through the second sliding hole, enabling it to slide relative to the stopper 7 in the second direction. The second sliding hole also allows the fixed-length rod 5 to swing about a line parallel to the first direction.

[0103] In a further embodiment, the transmission device further includes a first connecting rod 9 and a second connecting rod 10 .

[0104] The first connecting rod 9 and the second connecting rod 10 are arranged crosswise, and the first connecting rod 9 and the second connecting rod 10 are both rotatably connected to the sealing cover 3. The rotation axis of the first connecting rod 9 relative to the sealing cover 3 and the rotation axis of the second connecting rod 10 relative to the sealing cover 3 are both arranged along the second direction and both pass through the center of the circular slide groove.

[0105] The two ends of the first connecting rod 9 are respectively connected to a connecting seat 8. Specifically, one end of the first connecting rod 9 is connected to the connecting seat 8 located at the end of one of the telescopic rods 6, and the other end of the first connecting rod 9 is connected to the connecting seat 8 located at the end of one of the fixed-length rods 5.

[0106] The two ends of the second connecting rod 10 are respectively connected to a connecting seat 8. Specifically, one end of the second connecting rod 10 is connected to the connecting seat 8 located at the end of another telescopic rod 6, and the other end of the second connecting rod 10 is connected to the connecting seat 8 located at the end of another fixed-length rod 5.

[0107] The arrangement of the first connecting rod 9 and the second connecting rod 10 can ensure the smoothness of the sliding of the connecting seat 8 relative to the sealing cover 3, and can avoid the problem that the connecting seat 8 is stuck and cannot slide in the circular sliding groove.

[0108] A fifth elastic member is further provided between the first connecting rod 9 and the second connecting rod 10. The fifth elastic member has a tendency to rotate the first connecting rod 9 and the second connecting rod 10 in a direction moving the pair of telescopic rods 6 away from each other, so as to cause the sealing cover 3 to be perpendicular to the second direction.

[0109] In this embodiment, the telescopic rod 6 includes a first rod body 11 , a second rod body 12 , a sliding control mechanism and a third elastic member.

[0110] The first end of the first rod body 11 is connected with the fixing frame 4, and the second end of the first rod body 11 is located in the first sliding hole, so that the first rod body 11 is in sliding fit with the limiting piece 7, and the sliding direction of the first rod body 11 relative to the limiting piece 7 is along the axial direction of the first rod body 11.

[0111] The second end of the second rod body 12 is connected with the connecting seat 8, and the first end of the second rod body 12 is located in the first sliding hole, so that the second rod body 12 is in sliding fit with the limiting piece 7 and the first rod body 11, and the sliding direction of the second rod body 12 relative to the first rod body 11 and the limiting piece 7 is along the axial direction of the second rod body 12.

[0112] It can be understood that the first rod body 11 and the second rod body 12 can slide relative to the limiting piece 7, and the first rod body 11 and the second rod body 12 can slide relative to each other, and when the first rod body 11 and the second rod body 12 slide relative to each other, the telescopic rod 6 can be telescoped.

[0113] The third elastic piece is arranged between the first rod body 11 and the second rod body 12, and the third elastic piece can make the second rod body 12 have a tendency to approach the fixing frame 4, so that the first end of the first rod body 11 and the second end of the second rod body 12 have a tendency to approach each other.

[0114] The sliding control mechanism is arranged between the second rod body 12 and the limiting piece 7, and the sliding control mechanism can be switched between the avoiding state and the limiting state.

[0115] When the sliding control mechanism is switched to the avoiding state, the second rod body 12 can slide relative to the limiting piece 7 along the second direction, and at this time, the second rod body 12 can slide relative to the first rod body 11 along the direction approaching the fixing frame 4 under the action of the third elastic piece, so that the telescopic rod 6 is contracted. If the telescopic rod 6 is in the contracted state, and the first rod body 11 slides away from the box body 2, the second rod body 12 will slide together with the first rod body 11.

[0116] When the sliding control mechanism is switched to the limiting state, the sliding control mechanism can limit the second rod body 12 from sliding along the direction approaching the fixing frame 4, and at this time, the second rod body 12 is relatively fixed with the limiting piece 7, and the driving device can drive the first rod body 11 to slide away from the box body 2 by overcoming the action of the third elastic piece, so that the telescopic rod 6 is elongated.

[0117] When the drive device drives the fixing frame 4 away from the housing 2 and the sliding control mechanism is in the avoidance state, the length of the telescopic rod 6 remains at its minimum or the telescopic rod 6 is retracted. If the length of the telescopic rod 6 remains at its minimum, the end of the sealing cover 3 corresponding to the telescopic rod 6 and the end of the sealing cover 3 corresponding to the fixed-length rod 5 slide synchronously, and the angle of the sealing cover 3 remains unchanged. If the telescopic rod 6 is retracted, the sliding speed of the end of the sealing cover 3 corresponding to the telescopic rod 6 is greater than the sliding speed of the end of the sealing cover 3 corresponding to the fixed-length rod 5, and the angle of the sealing cover 3 changes.

[0118] With such arrangement, when the driving device drives the fixing frame 4 away from the box body 2 , the telescopic movement of the telescopic rod 6 can be controlled by the sliding control mechanism, thereby controlling the angle of the sealing cover 3 .

[0119] In this embodiment, the sliding control mechanism includes a rotating disk 13, a second stopper 14 and a rotation drive assembly.

[0120] The plane of the rotating disk 13 is perpendicular to the first direction. A mounting hole is provided on the stopper 7, which extends through the side wall of the first sliding hole along the first direction. The rotating disk 13 is rotatably mounted in the mounting hole, and the rotation axis of the rotating disk 13 relative to the stopper 7 is parallel to the first direction.

[0121] Specifically, the rotating disk 13 can be connected to the limiting member 7 via a bearing or a slewing bearing to ensure that the rotating disk 13 can smoothly rotate relative to the box body 2 around a straight line parallel to the first direction when subjected to force.

[0122] The second stopper 14 is disposed on a side of the rotating disk 13 facing the second rod 12, and a first end of the second stopper 14 is rotatably connected to the rotating disk 13. The second stopper 14 is perpendicular to the first direction relative to the rotation axis of the rotating disk 13, and the second end of the second stopper 14 is a free end. When the second stopper 14 rotates relative to the rotating disk 13, its second end can move closer to or farther from the second rod 12.

[0123] A second inclined surface 15 and an abutting portion 16 are provided on the second rod body 12, wherein the second inclined surface 15 is parallel to the third direction, the second inclined surface 15 is arranged at an angle to the first direction, and the second inclined surface 15 is arranged at an angle to the second direction. Figure 8 In the direction away from the fixing frame 4 , the distance between the second inclined surface 15 and the rotating disk 13 gradually decreases, and the abutting portion 16 is located at the end of the second inclined surface 15 away from the fixing frame 4 .

[0124] The rotating disk 13 can rotate between an evasive position and an abutting position, and the rotation driving assembly is used to drive the rotating disk 13 to rotate between the evasive position and the abutting position.

[0125] When the rotating disk 13 rotates to the avoidance position, the projection of the second end of the second stop block 14 along the first direction is located outside the trajectory of the abutment portion 16 sliding with the second rod body 12. At this time, the second rod body 12 can slide relative to the limit member 7, corresponding to the avoidance state of the sliding control mechanism.

[0126] When the rotating disk 13 rotates to the abutment position, the projection of the second end of the second stopper 14 along the first direction lies within the trajectory of the abutment portion 16 sliding along the second rod 12. At this point, if the abutment portion 16 of the second rod 12 is located on the side of the second stopper 14 away from the fixed frame 4, the second stopper 14 can abut against the abutment portion 16 to restrict the second rod 12 from sliding in a direction toward the fixed frame 4, corresponding to the limited state of the sliding control mechanism. If the abutment portion 16 of the second rod 12 is located on the side of the second stopper 14 closer to the fixed frame 4, the second rod 12 can slide relative to the fixed frame 4, corresponding to the avoidance state of the sliding control mechanism.

[0127] In some embodiments, a sixth elastic member may be provided between the second stopper 14 and the rotating disk 13. The sixth elastic member causes the second stopper 14 to move away from the rotating disk 13 so that the second end of the second stopper 14 can abut against the abutting portion 16. When other forces act on the second stopper 14, the force of the sixth elastic member will be overcome and the second stopper 14 will move closer to the rotating disk 13.

[0128] In other embodiments, the first direction can be made consistent with the vertical direction. In this case, the second stopper 14 will move away from the rotating disk 13 under the action of its own gravity. In a natural state, the second stopper 14 is in a drooping state, and the angle between the second stopper 14 and the rotating disk 13 is an acute angle.

[0129] Specifically, a groove may be provided at a position of the rotating disk 13 corresponding to the second stopper 14 , so that the second stopper 14 can completely enter the groove when rotating toward the rotating disk 13 , thereby avoiding the second stopper to the greatest extent.

[0130] In this embodiment, the rotation driving assembly includes a first stopper 17 , a driving portion and a fourth elastic member.

[0131] The first stopper 17 is disposed on a side of the rotating disk 13 facing the first rod 11. A first end of the first stopper 17 is rotatably connected to the rotating disk 13. The first stopper 17 is perpendicular to the first direction relative to the rotation axis of the rotating disk 13. The second end of the first stopper 17 is a free end. When the first stopper 17 rotates relative to the rotating disk 13, it can move closer to or farther from the first rod 11.

[0132] The driving part is provided at the second end of the first rod 11. Along the third direction, the driving part is located on one side of the first rod 11. The surface of the driving part away from the first rod 11 is a first inclined surface 18. As it moves away from the fixing frame 4, the distance between the first inclined surface 18 and the central axis of the first rod 11 gradually increases. Figure 8 .

[0133] The fourth elastic member is disposed between the rotating disk 13 and the limiting member 7 , and the fourth elastic member can cause the rotating disk 13 to rotate toward the abutting position.

[0134] As the first rod 11 slides along the fixed frame 4, the driving portion slides relative to the rotating disk 13 and the limiting member 7. Before the first inclined surface 18 interacts with the first stop 17, the rotating disk 13 is in the abutting position under the action of the fourth elastic member. At this time, when the abutting portion 16 on the second rod 12 is located on the side of the second stop 14 away from the fixed frame 4, the second end of the second stop 14 abuts against the abutting portion 16, and the second stop 14 restricts the sliding of the second rod 12. The first rod 11 continues to slide, and the first inclined surface 18 gradually interacts with the second end of the first stop 17. The force exerted by the first inclined surface 18 on the first stop 17 drives the first stop 17 to rotate the rotating disk 13. When the rotating disk 13 rotates to the avoidance position, the second stop 14 avoids the abutting portion 16, and the second rod 12 approaches the first rod 11 and the fixed frame 4 under the action of the third elastic member and the medium pressure inside the box 2.

[0135] When the second rod 12 approaches the first rod 11 and the fixing frame 4 under the action of the third elastic member and the medium pressure inside the housing 2, the abutting portion 16 on the second rod 12 moves to the side of the second stopper 14 close to the fixing frame 4. The provision of the second inclined surface 15 ensures that the second rod 12 can smoothly return to the side where its abutting portion 16 is located on the side of the second stopper 14 away from the fixing frame 4, allowing the second rod 12 to approach the housing 2 and allowing the sealing cover 3 to slide smoothly to the second position.

[0136] In some embodiments, a seventh elastic member may be provided between the first stopper 17 and the rotating disk 13 , which allows the first stopper 17 to move away from the rotating disk 13 so that the second end of the first stopper 17 can interact with the driving portion.

[0137] In other embodiments, the first direction may be consistent with the vertical direction. In this case, the first stopper 17 will be away from the rotating disk 13 under the action of its own gravity. In a natural state, the first stopper 17 is in a drooping state.

[0138] It should be noted that a driving part can be provided on both sides of the second end of the first rod body 11 along the third direction, so that the first rod body 11 has a symmetrical structure. When assembling the transmission device, there is no need to distinguish the direction of the first rod body 11, which facilitates installation.

[0139] The first elastic member, the second elastic member and the third elastic member may be, but are not limited to, coil springs; the fourth elastic member, the fifth elastic member, the sixth elastic member and the seventh elastic member may be, but are not limited to, torsion springs.

[0140] The above-mentioned driving device can be set as a screw nut transmission, cylinder, hydraulic cylinder, electric cylinder, gear rack transmission, sprocket chain transmission and other structural forms, as long as the driving device has an output end that can be displaced along a straight line.

[0141] In the embodiment of the present invention, the driving device is configured as a screw-nut transmission structure. Specifically, the driving device includes a rack 25, a gear 26 and a driving member.

[0142] The axis of rack 25 is parallel to the opening direction of housing 2, that is, the axis of rack 25 is arranged along the second direction. Gear 26 is rotatable about a fixed axis. The driving member is in driving connection with gear 26, and gear 26 meshes with rack 25 for transmission. When the driving member drives gear 26 to rotate in the forward direction, rack 25 moves toward housing 2. When the driving member drives gear 26 to rotate in the reverse direction, rack 25 moves away from housing 2.

[0143] The driving member can be, but is not limited to, an electric motor or the like.

[0144] The variable volume pressure cycle hydrogen sealing material performance test bench provided in this embodiment may include only one test box 1, or may include two test boxes 1, or may include multiple test boxes 1. When the variable volume pressure cycle hydrogen sealing material performance test bench includes multiple test boxes 1, multiple test pieces can be tested simultaneously.

[0145] When the variable volume pressure cycle hydrogen sealing material performance test bench includes only one test chamber 1, the drive device includes only one set of gears 26 and one set of racks 25. The gears 26 of one set are coaxially fixed, and the racks 25 of one set are arranged in parallel and relatively fixed. The racks 25 of one set mesh with the gears 26 of the other set for transmission. Each rack 25 of one set is connected to the fixed frame 4 of the transmission device corresponding to the test chamber 1.

[0146] When the variable volume pressure cycling hydrogen sealing material performance test bench includes two test boxes 1, the sealing covers 3 of the two test boxes 1 are arranged facing each other, and the drive device is located between the two test boxes 1. The drive device includes a set of gears 26 and two sets of racks 25. The gears 26 of one set are coaxially fixed, and the racks 25 of each set are arranged in parallel and relatively fixed. The axes of the two sets of racks 25 are parallel to each other, and the meshing tooth surfaces are arranged facing each other. A set of gears 26 is located between the two sets of racks 25, and the set of gears 26 is meshed with both sets of racks 25 for transmission. Each set of racks 25 is connected to the fixed frame 4 of the transmission device corresponding to one test box 1.

[0147] When the variable volume pressure cycle hydrogen sealing material performance test bench includes multiple test boxes 1, each test box 1 corresponds to a set of racks 25. Two sets of racks 25 can correspond to one set of gears 26, or each set of racks 25 can correspond to one set of gears 26. Each set of gears 26 is coaxially fixed and driven to rotate by the same driving member.

[0148] A set of gears 26 may include only one gear 26 or at least two gears 26. Similarly, a set of racks 25 may include only one rack 25 or at least two racks 25. There is a one-to-one correspondence between gears 26 and racks 25. The greater the number of gears 26 included in each set of gears 26, the greater the strength and stability of the transmission device.

[0149] In the embodiment of the present invention, the test box 1 further includes a first sliding member 19 , a second sliding member 20 , a first elastic member, and a second elastic member.

[0150] The box body 2 has two opposing side walls, namely a first side wall and a second side wall. The first side wall and the second side wall are arranged in the same direction as the telescopic rod 6 and the fixed-length rod 5, and are both arranged along a first direction. The first side wall is located on the side of the telescopic rod 6 away from the fixed-length rod 5, and the second side wall is located on the side of the fixed-length rod 5 away from the telescopic rod 6.

[0151] The first sliding member 19 is slidably connected to the first side wall of the box body 2. The sliding direction of the first sliding member 19 relative to the first side wall is along the second direction. The first elastic member is disposed between the first sliding member 19 and the first side wall. The first elastic member can cause the first sliding member 19 to have a tendency to approach the open end of the box body 2.

[0152] The second sliding member 20 is slidably connected to the second side wall of the box body 2. The second sliding member 20 slides along the second direction relative to the second side wall. A second elastic member is disposed between the second sliding member 20 and the second side wall. The second elastic member can cause the second sliding member 20 to have a tendency to move away from the open end of the box body 2.

[0153] The sealing cover 3 changes angle when switching between the first position and the second position, and both the first sliding member 19 and the second sliding member 20 interact with the sealing cover 3. The provision of the first elastic member and the second elastic member ensures that the first sliding member 19 and the second sliding member 20 maintain close contact with the sealing cover 3, ensuring a sealed fit between the sealing cover 3 and the housing 2, avoiding problems such as medium leakage caused by changes in the position and angle of the sealing cover 3, preventing unexpected factors from affecting the test results, and ensuring the accuracy of the test results.

[0154] The first sliding member 19 and the second sliding member 20 may be made of, but are not limited to, rubber.

[0155] When installing the first sliding member 19 and the second sliding member 20, mounting grooves can be provided on the first side wall and the second side wall, the first sliding member 19 is provided in the mounting groove of the first side wall, and the second sliding member 20 is provided in the mounting groove of the second side wall.

[0156] In this embodiment, a surface of the first sliding member 19 close to the second side wall is a first arc-shaped surface, and a surface of the second sliding member 20 close to the first side wall is a second arc-shaped surface.

[0157] The distance between the first curved surface and the second side wall gradually increases in a direction approaching the fixing frame 4. The distance between the second curved surface and the first side wall gradually decreases in a direction approaching the fixing frame 4.

[0158] In the embodiment of the present invention, the box body 2 is configured as a double-layer structure. Specifically, the box body 2 includes an inner box body 21 , an outer box body 22 and a shock-absorbing layer 23 .

[0159] The outer box body 22 is sleeved on the outer side of the inner box body 21. One end of the outer box body 22 and the inner box body 21 are both open. The inner cavity of the inner box body 21 is used to accommodate the medium. The sealing cover 3 is matched with the inner box body 21.

[0160] The outer box body 22 is used to be fixed on the support frame, and the shock-absorbing layer 23 is arranged between the outer box body 22 and the inner box body 21, which can reduce the impact of the vibration of the inner box body 21 on the outer box body 22, and avoid the impact of the vibration generated during the test process on the surrounding environment. At the same time, it can also reduce the impact of the vibration of the outer box body 22 on the inner box body 21, and avoid the impact of the vibration of the external environment on the test process.

[0161] The test process for testing a hydrogen sealing ring using the variable volume pressure cycle hydrogen sealing material performance test bench provided by an embodiment of the present invention is as follows.

[0162] The hydrogen sealing ring to be tested is installed in the receiving groove of the sealing cover 3, and the sealing cover 3 is installed on the open end of the box body 2, with the sealing cover 3 perpendicular to the second direction.

[0163] Hydrogen is filled into the box body 2 through the filling port 24 until the pressure in the box body 2 reaches a certain value, and then the filling port 24 is blocked by a blocking member.

[0164] The driving device is controlled to operate so that the gear 26 rotates in the opposite direction, driving the rack 25 to drive the fixed frame 4 away from the box body 2. At this time, the fixed-length rod 5 and the first rod body 11 and the second rod body 12 of the telescopic rod 6 are synchronously moved away from the box body 2, and the sealing cover 3 slides toward the open end of the box body 2. During the sliding process, the sealing cover 3 maintains a posture perpendicular to the second direction.

[0165] Until the contact portion 16 of the second rod 12 contacts the stopper on the rotating disk 13, the second rod 12 cannot move further away from the box 2, the fixed-length rod 5 and the first rod 11 of the telescopic rod 6 continue to move away from the box 2, and the telescopic rod 6 begins to extend. At this time, the end of the sealing cover 3 corresponding to the second rod 12 remains stationary, while the end of the sealing cover 3 corresponding to the fixed-length rod 5 continues to slide toward the open end of the box 2, gradually tilting the sealing cover 3 and changing its angle.

[0166] As the first rod 11 continues to move away from the box body 2, the first stopper 17 on the rotating disk 13 interacts with the driving portion on the first rod 11, causing the rotating disk 13 to rotate toward the avoidance position. When the rotating disk 13 rotates to the avoidance position, the second stopper 14 avoids the abutment portion 16 on the second rod 12 of the telescopic rod 6, the driving device stops running, the gear 26 stops rotating, and the fixed-length rod 5 and the first rod 11 of the telescopic rod 6 remain in the same position. At this time, the second rod 12 moves away from the box body 2 under the action of the third elastic member and the pressure in the test box 1, the telescopic rod 6 begins to shrink, and the end of the sealing cover 3 corresponding to the second rod 12 slides toward the open end of the box body 2, while the end of the sealing cover 3 corresponding to the fixed-length rod 5 remains in the same position. The sealing cover 3 gradually returns to a posture perpendicular to the second direction. At this time, the position of the sealing cover 3 is the first position.

[0167] That is, the process of the driving device driving the sealing cover 3 to slide from the second position to the first position includes three stages. In the first stage, the sealing cover 3 maintains a posture perpendicular to the second direction and slides at a constant speed. In the second stage, the end of the sealing cover 3 corresponding to the telescopic rod 6 remains stationary, while the end of the sealing cover 3 corresponding to the fixed-length rod 5 slides toward the fixed frame 4 at a constant speed. In the third stage, the end of the sealing cover 3 corresponding to the telescopic rod 6 slides rapidly toward the fixed frame 4, while the end of the sealing cover 3 corresponding to the fixed-length rod 5 remains stationary. The pressure change rate of the test box 1 in the first stage is greater than the pressure change rate of the test box 1 in the second stage, and both are less than the pressure change rate of the test box 1 in the third stage.

[0168] The control driving device continues to run, so that the gear 26 rotates forward, and the driving rack 25 drives the fixed frame 4 to move closer to the box body 2. At this time, the fixed-length rod 5 and the first rod body 11 and the second rod body 12 of the telescopic rod 6 move closer to the box body 2 synchronously, and the sealing cover 3 slides toward the inside of the box body 2. During the sliding process, the sealing cover 3 maintains a posture perpendicular to the second direction until the sealing cover 3 slides to the second position.

[0169] According to this cycle, it is only necessary to control the driving device to make the gear 26 rotate forward or reverse, and the control process is simple.

[0170] In summary, the variable volume pressure cycle hydrogen sealing material performance test bench provided by the embodiment of the present invention can realize the alternating and variable speed changes of the volume and pressure of the test box 1, and can perform variable pressure tests on the hydrogen sealing ring waiting to be tested. Moreover, during the process of pressure changes in the test box 1, the pressure can be changed within a range at different speeds without the need for a complex control process, thereby reducing the cost and complexity of the test. In addition, the same variable volume pressure cycle hydrogen sealing material performance test bench can test multiple test pieces at the same time, with high experimental efficiency. The test process and time of multiple test boxes 1 are completely consistent. When multiple test pieces are of the same material and specification, the test results of each test piece can be compared and verified with each other, which is conducive to improving the accuracy of the test results.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A variable volume pressure cycle hydrogen sealing material performance test bench, characterized in that: include: A test box (1) comprises a box body (2) and a sealing cover (3), wherein the box body (2) has a receiving cavity inside and is open at one end, the opening direction of the box body (2) is parallel to the second direction, the first direction and the third direction are both perpendicular to the second direction, and the third direction is perpendicular to the first direction, a receiving groove for receiving a test piece is provided on the peripheral side of the sealing cover (3), the sealing cover (3) is movably arranged at the open end of the box body (2), the sealing cover (3) is slidably matched with the box body (2), and the sealing cover (3) can be switched between a first position and a second position, and the volume of the test box (1) when the sealing cover (3) is in the first position is greater than the volume of the test box (1) when the sealing cover (3) is in the second position; A driving device, arranged outside the test box (1), the driving device being suitable for providing power for position switching of the sealing cover (3); a transmission device, arranged between the sealing cover (3) and the driving device, the transmission device being suitable for driving the sealing cover (3) to move at a constant speed and being capable of changing the angle of the sealing cover (3); The transmission device comprises: A fixed frame (4) is fixedly connected to the output end of the driving device, and the fixed frame (4) moves closer to or farther from the box (2) under the action of the driving device; A fixed-length rod (5) and a telescopic rod (6) are arranged between the fixed frame (4) and the sealing cover (3); the fixed-length rod (5) and the telescopic rod (6) are distributed along a first direction; a group of the fixed-length rod (5) is provided, and a group of the fixed-length rod (5) is distributed along a third direction; a group of the telescopic rod (6) is provided, and a group of the telescopic rod (6) is distributed along the third direction; a first end of the fixed-length rod (5) and a first end of the telescopic rod (6) are both connected to the fixed frame (4); a second end of the fixed-length rod (5) and a second end of the telescopic rod (6) are both movably connected to the sealing cover (3), so that an angle of the sealing cover (3) relative to the fixed-length rod (5) and an angle of the sealing cover (3) relative to the telescopic rod (6) are variable; The test box (1) further comprises: a first sliding member (19) slidably connected to a first side wall of the box body (2); the sliding direction of the first sliding member (19) relative to the first side wall is along a second direction; the first side wall is located on a side of the telescopic rod (6) away from the fixed-length rod (5); a first elastic member disposed between the first sliding member (19) and the first side wall, the first elastic member being adapted to cause the first sliding member (19) to tend to approach the open end of the box body (2); a second sliding member (20) slidably connected to a second side wall of the box body (2), wherein a sliding direction of the second sliding member (20) relative to the second side wall is along the second direction, and the second side wall is located on a side of the fixed-length rod (5) away from the telescopic rod (6); A second elastic member is provided between the second sliding member (20) and the second side wall, and the second elastic member is adapted to make the second sliding member (20) tend to move away from the open end of the box body (2).

2. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 1 is characterized in that: The transmission device further comprises: a limiting member (7) fixed relative to the box body (2), the limiting member (7) being adapted to limit the displacement of the telescopic rod (6) and the fixed-length rod (5) along the first direction; A connecting seat (8), wherein the second end of each fixed-length rod (5) and the second end of each telescopic rod (6) are connected to the sealing cover (3) via the connecting seat (8); the connecting seat (8) is capable of rotating relative to the fixed-length rod (5) and the telescopic rod (6) at least about a straight line parallel to the third direction; the connecting seat (8) is slidably connected to the sealing cover (3); and when the connecting seat (8) slides relative to the sealing cover (3), it has a sliding component parallel to the sealing cover (3) and perpendicular to the third direction.

3. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 2 is characterized in that: The sealing cover (3) is provided with a circular sliding groove, and each of the connecting seats (8) is embedded in the circular sliding groove; The fixed-length rod (5) and the telescopic rod (6) are each provided in a pair, the first end of the telescopic rod (6) and the first end of the fixed-length rod (5) are both capable of rotating at least about a straight line parallel to the first direction, and the second end of the telescopic rod (6) and the second end of the fixed-length rod (5) are both universally connected to the connecting seat (8); The limiting member (7) is provided with a first sliding hole and a second sliding hole, and the first sliding hole and the second sliding hole both penetrate the limiting member (7) along the second direction, the telescopic rod (6) penetrates the first sliding hole, and the first sliding hole allows the telescopic rod (6) to swing around a straight line parallel to the first direction, and the fixed-length rod (5) penetrates the second sliding hole, and the second sliding hole allows the fixed-length rod (5) to swing around a straight line parallel to the first direction.

4. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 3 is characterized in that: The transmission device further comprises: The first connecting rod (9) and the second connecting rod (10) are cross-arranged and are both rotatably connected to the sealing cover (3). The first connecting rod (9) is arranged relative to the rotation axis of the sealing cover (3) and the second connecting rod (10) is arranged relative to the rotation axis of the sealing cover (3) along the second direction and pass through the center of the circular groove. The two ends of the first connecting rod (9) are respectively connected to one of the connecting seats (8), and the two ends of the second connecting rod (10) are respectively connected to one of the connecting seats (8).

5. The variable volume pressure cycle hydrogen sealing material performance test bench according to any one of claims 2 to 4, characterized in that: The telescopic rod (6) comprises: A first rod (11) is slidably engaged with the limiting member (7), wherein the sliding direction of the first rod (11) relative to the limiting member (7) is along the axial direction of the first rod (11), and a first end of the first rod (11) is connected to the fixing frame (4); a second rod (12) slidingly engaged with the first rod (11) and the limiting member (7); a sliding direction of the second rod (12) relative to the first rod (11) and the limiting member (7) being along an axial direction of the second rod (12); and a second end of the second rod (12) being connected to the connecting seat (8); a third elastic member disposed between the first rod (11) and the second rod (12), the third elastic member being adapted to cause the second rod (12) to tend to approach the fixing frame (4); The sliding control mechanism is capable of switching between an avoidance state and a limiting state. In the avoidance state, the second rod body (12) can slide relative to the limiting member (7) in a second direction. In the limiting state, the sliding control mechanism restricts the second rod body (12) from sliding in a direction close to the fixing frame (4).

6. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 5 is characterized in that: The sliding control mechanism comprises: a rotating disk (13) perpendicular to the first direction, wherein the rotating disk (13) is capable of rotating relative to the box (2) around a straight line parallel to the first direction under a force; A second stopper (14), wherein the first end of the second stopper (14) is rotatably arranged on a side of the rotating disk (13) facing the second rod body (12), the second stopper (14) is perpendicular to the first direction relative to the rotation axis of the rotating disk (13), the second end of the second stopper (14) is a free end, and the second rod body (12) is provided with a second inclined surface (15) and an abutting portion (16), the second inclined surface (15) is parallel to the third direction, and in a direction away from the fixing frame (4), the second inclined surface (15) is in contact with the rotating disk (1 3) is gradually reduced, the abutment portion (16) is located at an end of the second inclined surface (15) away from the fixing frame (4), and the rotating disk (13) is rotatable between an avoidance position and an abutment position. In the avoidance position, the projection of the second end of the second stopper (14) along the first direction is located outside the trajectory of the abutment portion (16) sliding along the second rod body (12); in the abutment position, the projection of the second end of the second stopper (14) along the first direction is located within the trajectory of the abutment portion (16) sliding along the second rod body (12); The rotation drive assembly is suitable for driving the rotating disk (13) to rotate between the avoidance position and the abutment position.

7. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 6 is characterized in that: The rotation drive assembly includes: a first stopper (17), wherein a first end of the first stopper (17) is rotatably disposed on a side of the rotating disk (13) facing the first rod body (11), the first stopper (17) is perpendicular to the first direction relative to the rotation axis of the rotating disk (13), and the second end of the first stopper (17) is a free end; a driving portion, arranged at the second end of the first rod (11); along the third direction, the driving portion is located on one side of the first rod (11); a surface of the driving portion away from the first rod (11) is a first inclined surface (18); and a distance between the first inclined surface (18) and the central axis of the first rod (11) gradually increases in a direction away from the fixing frame (4); A fourth elastic member is provided between the rotating disk (13) and the limiting member (7), and the fourth elastic member is suitable for causing the rotating disk (13) to rotate toward the abutting position.

8. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 1 is characterized in that: A side surface of the first sliding member (19) close to the second side wall is a first arc-shaped surface, and the distance between the first arc-shaped surface and the second side wall gradually increases in a direction close to the fixing frame (4); A side surface of the second sliding member (20) close to the first side wall is a second arc-shaped surface, and the distance between the second arc-shaped surface and the first side wall gradually decreases in a direction close to the fixing frame (4).

9. The variable volume pressure cycle hydrogen sealing material performance test bench according to any one of claims 1 to 4, characterized in that: The box (2) comprises: An inner box body (21) and an outer box body (22), wherein the outer box body (22) is sleeved on the outside of the inner box body (21), and one end of each of the outer box body (22) and the inner box body (21) is open, and the inner box body (21) is suitable for matching with the sealing cover (3); A shock-absorbing layer (23) is provided between the outer box (22) and the inner box (21).

10. The variable volume pressure cycle hydrogen sealing material performance test bench according to any one of claims 1 to 4, characterized in that: The box body (2) is provided with a filling port (24) for filling the box body (2) with a medium. The test box (1) further comprises: A blocking piece is used to block the filling port (24), and the blocking piece is detachably sealed to the box body (2).

11. The variable volume pressure cycle hydrogen sealing material performance test bench according to any one of claims 1 to 4, characterized in that: The driving device comprises: a rack (25), wherein the axis of the rack (25) is parallel to the opening direction of the box (2), and the rack (25) is suitable for approaching or moving away from the box (2); A gear (26) is capable of rotating about a fixed axis, and the gear (26) is meshed with the rack (25) for transmission; a driving member, in transmission connection with the gear (26); Wherein, when the test box (1) is provided with at least two, each gear (26) corresponds to two racks (25), each rack (25) is connected to a transmission device, and at least two gears (26) are provided, and each gear (26) is coaxially fixed.

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