Variable volume pressure cycle hydrogen sealing material performance test bench

Abstract

The invention relates to the technical field of test devices, and provides a variable volume pressure cycle hydrogen sealing material performance test bench, which comprises a test box, a driving device and a transmission device, the test box comprises a box body and a sealing cover, one end of the box body is open, and the peripheral side of the sealing cover is provided with an accommodating groove for accommodating a to-be-tested piece; the sealing cover is movably arranged at the open end of the box body and can be switched between a first position and a second position, and the volume of the test box when the sealing cover is located at the first position is larger than that of the test box when the sealing cover is located at the second position; the driving device provides power for position switching of the sealing cover; the transmission device drives the sealing cover to move at a constant speed and can change the angle of the sealing cover. According to the arrangement, alternate switching of the position and the angle of the sealing cover is achieved through the driving device and the transmission device, alternate and variable-speed changes of the volume and the internal pressure of the test box are achieved, a complex control process is not needed, the control process is remarkably simplified, and maintenance and test cost is reduced.

Description

Technical Field

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

[0002] Hydrogen seals are often subjected to cyclic loads, which are encountered in hydrogen applications such as fuel cells, hydrogen storage systems, chemical plants, and hydrogen transportation pipelines. The operation of the equipment is usually accompanied by frequent changes in pressure and temperature, causing the hydrogen sealing materials to be subjected to repeated expansion, compression, and shear stresses. 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 change 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 the high permeability and flammability of hydrogen require the sealing system to have extremely high integrity. Through the pressure change experiment, 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, so as to ensure the stable performance of the sealing ring in a dynamic pressure change environment, predict its service life and maintenance requirements, and thus improve the overall safety and reliability of the system.

[0004] In the prior art, pressure changes can be achieved in a variety of ways. A commonly used pressure source is a hydraulic system, which uses boosting devices such as booster pumps and booster gas cylinders to increase system pressure, and uses regulating devices such as pressure regulating valves, pressure reducing valves and pressure regulators to control the flow of gas or liquid, adjust the pressure and the speed of pressure change, and automatically adjust the pressure 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 invention provides a variable volume pressure cycle 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: A test box, comprising a box body and a sealing cover, wherein the box body has a receiving cavity inside and one end is open, and a receiving groove for receiving a test piece is arranged on the peripheral side of the sealing cover, and the sealing cover is movably arranged at the open end of the box body, and the sealing cover can be switched between a first position and a second position, and 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; A driving device, disposed outside the test box, and adapted to provide power for position switching of the sealing cover; The transmission device is arranged between the sealing cover and the driving device, and 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.

[0008] 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: A fixed frame, fixedly connected to the output end of the driving device, the fixed frame approaches or moves away from the box under the action of the driving device; 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 the fixed-length rod is provided, and a group of the fixed-length rods is distributed along a third direction, and the third direction is perpendicular to the first direction, and a group of the telescopic rod is provided, and a group of the telescopic rods is distributed along the third direction, a first end of the fixed-length rod and a first end of the telescopic rod are both connected to the fixed frame, and a second end of the fixed-length rod and a 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.

[0009] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the transmission device also includes: A limiting member, fixed relatively 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; 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.

[0010] 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; 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 around 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; The limiting member is provided with a first sliding hole and a second sliding hole, the first sliding hole and the second sliding hole both penetrate the limiting member along a second direction, 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.

[0011] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the transmission device also includes: 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 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.

[0012] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the telescopic rod comprises: A first rod body, slidably matched with the limiting member, wherein the sliding direction of the first rod body relative to the limiting member is along the axial direction of the first rod body, and the first end of the first rod body is connected to the fixing frame; A second rod body, slidably matched with the first rod body and the stopper, the sliding direction of the second rod body relative to the first rod body and the stopper 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; A third elastic member is disposed between the first rod and the second rod, and the third elastic member is adapted to make the second rod have a tendency to approach the fixing frame; 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 along 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 fixing frame.

[0013] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the sliding control mechanism comprises: A rotating disk, perpendicular to the first direction, the rotating disk being able to rotate relative to the box body around a straight line parallel to the first direction under force; 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, the second stopper is perpendicular to the first direction relative to the rotation axis of the rotating disk, the second end of the second stopper is a free end, and a second inclined surface and an abutment portion are provided on the second rod body, the second inclined surface is parallel to the third direction, and a distance between the second inclined surface and the rotating disk gradually decreases along a direction away from the fixed frame, the abutment portion is located at an end of the second inclined surface away from the fixed frame, and the rotating disk can rotate between an avoidance position and an abutment position, in the avoidance position, a projection of the second end of the second stopper along the first direction is located outside a trajectory of the abutment portion sliding with the second rod body, and in the abutment position, a projection of the second end of the second stopper along the first direction is located within a trajectory of the abutment portion sliding with the second rod body; The rotation driving assembly is adapted to drive the rotating disk to rotate between the avoidance position and the abutment position.

[0014] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the rotation drive assembly comprises: 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 rotating axis of the rotating disk, and a second end of the first stopper is a free end; A driving part is arranged at the second end of the first rod body, and along the third direction, the driving part is located at one side of the first rod body, and a surface of the driving part away from the first rod body is a first inclined surface, and along the direction away from the fixing frame, a distance between the first inclined surface and the central axis of the first rod body gradually increases; A fourth elastic member is disposed between the rotating disk and the limiting member, and the fourth elastic member is suitable for causing the rotating disk to rotate toward the abutting position.

[0015] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the test box also includes: A first sliding member is slidably connected to the first side wall of the box body, the sliding direction of the first sliding member relative to the first side wall is along a second direction, the second direction is 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; 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 have a tendency to approach the open end of the box body; A second sliding member is 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; The second elastic member is disposed between the second sliding member and the second side wall, and the second elastic member is suitable for causing the second sliding member to have a tendency to move away from the open end of the box body.

[0016] 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; 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 along a direction close to the fixing frame.

[0017] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the box body comprises: An inner box and an outer box, wherein the outer box is sleeved on the outside of the inner box, one end of the outer box and the inner box are both open, and the inner box is suitable for matching with the sealing cover; The shock-absorbing layer is arranged between the outer box body and the inner box body.

[0018] 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 medium into the box body, and the test box further includes: The blocking piece is used to block the filling port, and the blocking piece is detachably sealed and connected to the box body.

[0019] According to a variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention, the driving device comprises: A rack, the axis of which is parallel to the opening direction of the box, and the rack is suitable for approaching or moving away from the box; A gear, which can rotate about a fixed axis, and the gear is meshed with the rack for transmission; A driving member, drivingly connected to the gear; Wherein, when at least two of the test boxes are provided, each of the gears corresponds to two of the racks, each of the racks is connected to a corresponding transmission device, and at least two of the gears are provided, and each of the gears is coaxially fixed.

[0020] The variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention comprises a test box, a driving device and a transmission device. The test box comprises 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 surrounding side of the sealing cover is provided with a receiving groove, which 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 matching position of the sealing cover and the box body can be sealed so that the sealing cover and the box body are enclosed to form 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 alternating change of the volume of the test box can be realized, thereby realizing the alternating change of the internal pressure of the test box. The driving device is arranged outside the test box, and the transmission device is arranged between the sealing cover and the driving device. The driving device is used to provide power for the position switching 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, so that the volume of the test box changes at a variable speed, thereby making the internal pressure of the test box change at a variable speed. In this way, the driving device and the transmission device realize the alternating switching of the position and angle of the sealing cover, the alternating and variable speed changes of the volume of the test box and the alternating and variable speed changes of the internal pressure of the test box, without the need for a complex control process, the control process is significantly simplified, and the maintenance and testing costs are reduced, solving the problems of the complicated control process and high maintenance and testing costs of the variable pressure test device in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces 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 creative work.

[0022] Figure 1It is a structural schematic diagram of the variable volume pressure cycle hydrogen sealing material performance test bench provided by the present invention.

[0023] 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.

[0024] 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.

[0025] Figure 4 It is a structural schematic diagram of the transmission device provided by the present invention when the telescopic rod is in a retracted state.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Figure 8 yes Figure 6 Enlarged view of point I in the middle.

[0030] Fig. 9 It is a structural schematic diagram of the first stopper, the second stopper and the rotating disk provided by the present invention.

[0031] Fig.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 a viewing angle (the rotating disk is not shown).

[0032] Fig.11 It is a structural schematic diagram of the sliding control mechanism provided by the present invention when it is in a limited state at another viewing angle (the rotating disk is not shown).

[0033] Fig.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 a viewing angle (the rotating disk is not shown).

[0034] Fig.13 It is a structural schematic diagram of the sliding control mechanism provided by the present invention when it is in an avoidance state at another viewing angle (the rotating disk is not shown).

[0035] Fig.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.

[0036] Fig.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.

[0037] Fig.16 It is a cross-sectional view of the box provided by the present invention.

[0038] Fig.17 It is a partial structural schematic diagram of the driving device provided by the present invention.

[0039] Reference numerals: 1. Test box; 2. Box body; 3. Sealing cover; 4. Fixed 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 piece; 20. Second sliding piece; 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

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Combine the following Figures 1 to 17 The variable volume pressure cycle hydrogen sealing material performance test bench of the present invention is described.

[0042] 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.

[0043] 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. The sealing cover 3 is provided with a receiving groove on the circumferential side, 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 arranged 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 matching 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.

[0044] 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 switching the sealing cover 3 alternately between the first position and the second position, the alternating change of the volume of the test box 1 can be achieved, thereby achieving the alternating change of the internal pressure of the test box 1.

[0045] The driving device is arranged outside 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 making the internal pressure of the test box 1 change at a variable speed.

[0046] With such an arrangement, the alternating switching of the position and angle of the sealing cover 3 is achieved through the driving device and the transmission device, and the alternating and variable speed changes of the volume of the test box 1 and the alternating and variable speed changes of the internal pressure of the test box 1 are achieved. 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.

[0047] A medium with a certain pressure can be filled in the test box 1. After the pressure change test is performed on the test piece, the sealing performance of the test piece after the pressure change test can be determined by monitoring the pressure in the test box 1 and detecting the quality or concentration of the leaking medium after the test, thereby completing the performance test of the test piece.

[0048] The composition of the medium filled into the test box 1 can be determined according to the actual working condition of the test piece. For the hydrogen sealing ring, hydrogen can be filled into the test box 1. The hydrogen in the test box 1 can also provide a hydrogen environment for the hydrogen sealing ring, and at the same time test the permeability of hydrogen and the possible hydrogen embrittlement phenomenon to determine the resistance of the hydrogen sealing ring to hydrogen.

[0049] It should be noted that the sealing cover 3 includes an elastic plate 27 and a rigid plate 28, and the receiving groove is arranged on the peripheral side of the elastic plate 27 for mounting the test piece. The elastic plate 27 can undergo a certain elastic deformation, and can also be sealed with the box body 2 when the sealing cover 3 changes its angle. The area of ​​the rigid plate 28 is smaller than that of the elastic plate 27, and the rigid plate 28 is fixedly connected to the elastic plate 27 for supporting the elastic plate 27, and the transmission device is connected to the rigid plate 28 of the sealing cover 3.

[0050] In the 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 blocking member, which is detachably sealed and connected to the box body 2, and the filling port 24 can be blocked by the blocking member.

[0051] 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.

[0052] The transmission device comprises 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 be moved closer to or away from the box body 2 under the action of the driving device.

[0053] Specifically, a support frame can be configured for the variable volume pressure cycle hydrogen sealing material performance test bench so that the fixed frame 4 is slidably connected to the support frame, and the fixed 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.

[0054] 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 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, referring to Figure 1 The direction indicated by y in the figure; the third direction is perpendicular to the second direction and is referenced to Figure 1 The direction indicated by x.

[0055] 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.

[0056] A group of telescopic rods 6 is provided, and a group of telescopic rods 6 may include one telescopic rod 6, may include two telescopic rods 6, or may include a plurality of telescopic rods 6. Each telescopic rod 6 in a group is distributed along the third direction.

[0057] 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.

[0058] When the driving 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 box body 2 under the action of the fixed-length rod 5. The telescopic change of the telescopic rod 6 causes the length difference between the telescopic rod 6 and the fixed-length rod 5 to change, thereby causing 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 causing the angle of the sealing cover 3 to change.

[0059] In this embodiment, the transmission device further includes a limiting member 7 and a connecting seat 8.

[0060] The limiter 7 is relatively fixed to the box 2, and is used to limit the displacement of the telescopic rod 6 and the fixed-length rod 5 along the first direction. During the 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.

[0061] 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 via the connecting seat 8, and the second end of each telescopic rod 6 is also connected to the sealing cover 3 via the connecting seat 8.

[0062] 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.

[0063] 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.

[0064] Therefore, in this embodiment, the connection seat 8 is slidably connected to the sealing cover 3. When the connection 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.

[0065] 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.

[0066] When the connecting seat 8 slides along the circular slide 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.

[0067] Therefore, in this embodiment, the first end of the telescopic rod 6 and the first end of the fixed-length rod 5 can at least rotate 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.

[0068] In some embodiments, the first end of the telescopic rod 6 and the first end of the fixed-length rod 5 may be universally connected to the fixing frame 4 to prevent excessive constraints and reduce the stress between the telescopic rod 6 and the fixing frame 4 and the stress between the fixed-length rod 5 and the fixing frame 4. The universal connection may be achieved by a ball joint.

[0069] As for the structure of the stopper 7, a first sliding hole and a second sliding hole are provided on the stopper 7, and both the first sliding hole and the second sliding hole penetrate the stopper 7 along the second direction. The telescopic rod 6 passes through the first sliding hole, and the telescopic rod 6 can slide relative to the stopper 7 along the second direction, and the first sliding hole can allow the telescopic rod 6 to swing around a straight line parallel to the first direction. The fixed-length rod 5 passes through the second sliding hole, and the fixed-length rod 5 can slide relative to the stopper 7 along the second direction, and the second sliding hole can allow the fixed-length rod 5 to swing around a straight line parallel to the first direction.

[0070] In a further embodiment, the transmission device further includes a first connecting rod 9 and a second connecting rod 10 .

[0071] The first connecting rod 9 and the second connecting rod 10 are cross-arranged, 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 pass through the center of the circular slide groove.

[0072] Both 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.

[0073] Both 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.

[0074] The arrangement of the first connecting rod 9 and the second connecting rod 10 can ensure the smoothness of the connecting seat 8 when sliding relative to the sealing cover 3, and can avoid the problem that the connecting seat 8 is stuck and cannot slide in the circular slide groove.

[0075] A fifth elastic member is further provided between the first connecting rod 9 and the second connecting rod 10, and has a tendency to rotate the first connecting rod 9 and the second connecting rod 10 in a direction to move 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.

[0076] 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.

[0077] The first end of the first rod body 11 is connected to 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 and the limiting member 7 are slidably matched, and the sliding direction of the first rod body 11 relative to the limiting member 7 is along the axial direction of the first rod body 11.

[0078] The second end of the second rod body 12 is connected to 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 slidably matched with the limiting member 7, and the second rod body 12 is slidably matched with 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 member 7 is along the axial direction of the second rod body 12.

[0079] It can be understood that both the first rod body 11 and the second rod body 12 can slide relative to the stopper 7, and the first rod body 11 and the second rod body 12 can slide relatively, and when the first rod body 11 and the second rod body 12 slide relatively, the telescopic rod 6 can be extended and retracted.

[0080] The third elastic member is disposed between the first rod 11 and the second rod 12 , and the third elastic member can make the second rod 12 tend to approach the fixing frame 4 , so that the first end of the first rod 11 and the second end of the second rod 12 tend to approach each other.

[0081] The sliding control mechanism is disposed between the second rod body 12 and the limiting member 7 , and the sliding control mechanism can switch between an avoidance state and a limiting state.

[0082] When the sliding control mechanism is switched to the avoidance state, the second rod 12 can slide relative to the stopper 7 along the second direction. At this time, under the action of the third elastic member, the second rod 12 can slide relative to the first rod 11 in a direction close to the fixing frame 4 to retract the telescopic rod 6. If the telescopic rod 6 is in the retracted state and the first rod 11 slides in a direction away from the box 2, the second rod 12 will slide along with the first rod 11.

[0083] When the sliding control mechanism switches to the limiting state, the sliding control mechanism can limit the second rod body 12 from sliding in the direction close to the fixed frame 4. At this time, the second rod body 12 is relatively fixed to the limiting member 7, and the driving device can drive the first rod body 11 to overcome the action of the third elastic member and slide in the direction away from the box body 2, thereby extending the telescopic rod 6.

[0084] When the driving device drives the fixing frame 4 away from the box body 2 and the sliding control mechanism is in the avoidance state, the length of the telescopic rod 6 is kept at the shortest state or the telescopic rod 6 is retracted. If the length of the telescopic rod 6 is kept at the shortest state, 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.

[0085] With such arrangement, when the driving device drives the fixing frame 4 to move 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 .

[0086] In this embodiment, the sliding control mechanism includes a rotating disk 13, a second stopper 14 and a rotating drive assembly.

[0087] The plane where the rotating disk 13 is located is perpendicular to the first direction. A mounting hole is provided on the stopper 7, and the mounting hole penetrates the side wall of the first sliding hole along the first direction. The rotating disk 13 is rotatably arranged in the mounting hole, and the rotating axis of the rotating disk 13 relative to the stopper 7 is parallel to the first direction.

[0088] 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.

[0089] 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 a second end of the second stopper 14 is a free end. When the second stopper 14 rotates relative to the rotating disk 13, the second end thereof can approach or move away from the second rod 12.

[0090] 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 a 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 an end of the second inclined surface 15 away from the fixing frame 4 .

[0091] The rotating disk 13 can rotate between an evasive position and an abutting position, and the rotating driving assembly is used to drive the rotating disk 13 to rotate between the evasive position and the abutting position.

[0092] When the rotating disk 13 rotates to 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 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.

[0093] When the rotating disk 13 rotates to the abutting position, the projection of the second end of the second stopper 14 along the first direction is located within the trajectory of the abutting portion 16 sliding along the second rod body 12. At this time, if the abutting portion 16 of the second rod body 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 abutting portion 16 to limit the second rod body 12 from sliding in the direction close to the fixed frame 4, corresponding to the limiting state of the sliding control mechanism. If the abutting portion 16 of the second rod body 12 is located on the side of the second stopper 14 close to the fixed frame 4, the second rod body 12 can slide relative to the fixed frame 4, corresponding to the avoidance state of the sliding control mechanism.

[0094] In some embodiments, a sixth elastic member may be disposed between the second stopper 14 and the rotating disk 13, and the sixth elastic member causes the second stopper 14 to have a tendency 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 the second stopper 14 is subjected to other forces, it will overcome the force of the sixth elastic member and approach the rotating disk 13.

[0095] In other embodiments, the first direction can be made consistent with the vertical direction. At this time, 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.

[0096] Specifically, a groove may be provided at a position of the rotating disk 13 corresponding to the second stopper 14 , so that when the second stopper 14 rotates toward the rotating disk 13 , it can completely enter the groove to avoid the second stopper 14 to the greatest extent.

[0097] In this embodiment, the rotation driving assembly includes a first stopper 17, a driving part and a fourth elastic member.

[0098] The first stopper 17 is disposed on a side of the rotating disk 13 facing the first rod 11, and 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, and a 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 approach or move away from the first rod 11.

[0099] The driving part is disposed at the second end of the first rod 11. Along the third direction, the driving part is located at 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. Along the direction 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 .

[0100] 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.

[0101] When the first rod 11 slides with the fixed frame 4, the driving part slides relative to the rotating disk 13 and the limiting member 7. Before the first inclined surface 18 acts on the first stopper 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 stopper 14 away from the fixed frame 4, the second end of the second stopper 14 will abut against the abutting portion 16, and the second stopper 14 will limit the sliding of the second rod 12. The first rod 11 continues to slide, and the first inclined surface 18 gradually acts on the second end of the first stopper 17. The force of the first inclined surface 18 on the first stopper 17 drives the first stopper 17 to drive the rotating disk 13 to rotate. When the rotating disk 13 rotates to the avoidance position, the second stopper 14 avoids the abutting portion 16, and the second rod 12 will approach 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.

[0102] 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 box 2, the abutting portion 16 on the second rod 12 will move to the side of the second stopper 14 close to the fixing frame 4. The second inclined surface 15 is provided to ensure that the second rod 12 can smoothly return to the side where the abutting portion 16 is located on the second stopper 14 away from the fixing frame 4, so that the second rod 12 can approach the box 2, and the sealing cover 3 can smoothly slide to the second position.

[0103] In some embodiments, a seventh elastic member may be provided between the first stopper 17 and the rotating disk 13 , and the seventh elastic member allows the first stopper 17 to have a tendency to move away from the rotating disk 13 , so that the second end of the first stopper 17 can interact with the driving part.

[0104] 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.

[0105] 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 is convenient for installation.

[0106] The first elastic member, the second elastic member and the third elastic member may be, but are not limited to, spiral 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.

[0107] The above-mentioned driving device can be set as a screw nut transmission, a cylinder, a hydraulic cylinder, an electric cylinder, a gear rack transmission, a sprocket chain transmission and other structural forms, as long as the driving device has an output end that can be displaced in a straight line.

[0108] 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.

[0109] The axis of the rack 25 is parallel to the opening direction of the box body 2, that is, the axis of the rack 25 is arranged along the second direction. The gear 26 can rotate around a fixed axis, and the driving member is connected to the gear 26 in a transmission manner, and the gear 26 is meshed with the rack 25 for transmission. When the driving member drives the gear 26 to rotate forward, the rack 25 moves in a direction close to the box body 2; when the driving member drives the gear 26 to rotate reversely, the rack 25 moves in a direction away from the box body 2.

[0110] The driving member may be, but is not limited to, an electric motor or the like.

[0111] 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 to be tested may be tested simultaneously.

[0112] When the variable volume pressure cycle hydrogen sealing material performance test bench includes only one test box 1, the driving device includes only one set of gears 26 and one set of racks 25, the gears 26 of one set are coaxially fixed, the racks 25 of one set are arranged in parallel and relatively fixed, and the racks 25 of one set are respectively meshed with the gears 26 of one set for transmission. The racks 25 of one set are connected to the fixed frame 4 of the transmission device corresponding to the test box 1.

[0113] When the variable volume pressure cycle 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 driving device is located between the two test boxes 1. The driving 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 the two sets of racks 25 for transmission. Each set of racks 25 is connected to a fixed frame 4 of the transmission device corresponding to a test box 1.

[0114] When the variable volume pressure cycle hydrogen sealing material performance test bench includes a plurality of test boxes 1, each test box 1 corresponds to a set of racks 25, and two sets of racks 25 can correspond to a set of gears 26, or each set of racks 25 can correspond to a set of gears 26. Each set of gears 26 is coaxially fixed and driven to rotate by the same driving member.

[0115] 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. The gears 26 and racks 25 correspond one to one, and the more gears 26 each set of gears 26 includes, the better the strength and stability of the transmission device.

[0116] 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.

[0117] The box body 2 has two side walls facing each other, namely a first side wall and a second side wall, and the distribution direction of the first side wall and the second side wall is consistent with the distribution direction of the telescopic rod 6 and the fixed-length rod 5, and both are distributed along the 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.

[0118] The first sliding member 19 is slidably connected to the first side wall of the box body 2, and 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 arranged between the first sliding member 19 and the first side wall, and the first elastic member can make the first sliding member 19 have a tendency to approach the open end of the box body 2.

[0119] The second sliding member 20 is slidably connected to the second side wall of the box body 2, and the sliding direction of the second sliding member 20 relative to the second side wall is along the second direction. The second elastic member is arranged between the second sliding member 20 and the second side wall, and the second elastic member can make the second sliding member 20 have a tendency to move away from the open end of the box body 2.

[0120] The sealing cover 3 has an angle change when switching between the first position and the second position, and the first sliding member 19 and the second sliding member 20 both act on the sealing cover 3. The arrangement of the first elastic member and the second elastic member can ensure that the first sliding member 19 and the second sliding member 20 can maintain close contact with the sealing cover 3, ensure the sealing cooperation between the sealing cover 3 and the box body 2, avoid the problem of medium leakage caused by the change of the position and angle of the sealing cover 3, avoid the influence of unexpected factors on the test results, and ensure the accuracy of the test results.

[0121] The first sliding member 19 and the second sliding member 20 may be made of, but are not limited to, rubber.

[0122] When installing the first sliding member 19 and the second sliding member 20, mounting grooves may be provided on the first side wall and the second side wall, the first sliding member 19 may be provided in the mounting groove of the first side wall, and the second sliding member 20 may be provided in the mounting groove of the second side wall.

[0123] In this embodiment, a side surface of the first sliding member 19 close to the second side wall is a first arc-shaped surface, and a side surface of the second sliding member 20 close to the first side wall is a second arc-shaped surface.

[0124] The distance between the first arc-shaped surface and the second side wall gradually increases in the direction approaching the fixing frame 4. The distance between the second arc-shaped surface and the first side wall gradually decreases in the direction approaching the fixing frame 4.

[0125] 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 .

[0126] 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 contain the medium. The sealing cover 3 is matched with the inner box body 21.

[0127] 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 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.

[0128] The test process of 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.

[0129] 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, and the sealing cover 3 is perpendicular to the second direction.

[0130] 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 the filling port 24 is blocked by a blocking member.

[0131] The driving device is controlled to operate so that the gear 26 rotates in the opposite direction, and the rack 25 is driven 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.

[0132] Until the contact portion 16 of the second rod body 12 abuts against the stopper on the rotating disk 13, the second rod body 12 cannot move further away from the box body 2, the fixed-length rod 5 and the first rod body 11 of the telescopic rod 6 continue to move away from the box body 2, and the telescopic rod 6 begins to extend. At this time, the end of the sealing cover 3 corresponding to the second rod body 12 remains stationary, and the end of the sealing cover 3 corresponding to the fixed-length rod 5 continues to slide toward the open end of the box body 2, the sealing cover 3 gradually tilts, and the angle of the sealing cover 3 gradually changes.

[0133] As the first rod body 11 continues to move away from the box body 2, the first stopper 17 on the rotating disk 13 interacts with the driving part on the first rod body 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 part 16 on the second rod body 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 body 11 of the telescopic rod 6 remain in position. At this time, the second rod body 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 body 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 position, and 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.

[0134] That is to say, the process of the driving device driving the sealing cover 3 to slide from the second position to the first position includes three stages. The first stage is that the sealing cover 3 keeps sliding at a constant speed in a posture perpendicular to the second direction. The second stage is that the sealing cover 3 corresponding to the end of the telescopic rod 6 does not move, and the sealing cover 3 corresponding to the end of the fixed-length rod 5 slides toward the fixed frame 4 at a constant speed. The third stage is that the sealing cover 3 corresponding to the end of the telescopic rod 6 slides quickly toward the fixed frame 4, and the sealing cover 3 corresponding to the end of the fixed-length rod 5 does not move. Among them, the pressure change speed of the test box 1 in the first stage is greater than the pressure change speed of the test box 1 in the second stage, and both are less than the pressure change speed of the test box 1 in the third stage.

[0135] 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 approach 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 approach 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.

[0136] 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.

[0137] 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 change 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.

[0138] 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 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, and a receiving groove for receiving a test piece is arranged on the peripheral side of the sealing cover (3), and the sealing cover (3) is movably arranged at the open end of 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 is 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 able to change the angle of the sealing cover (3).

2. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 1 is characterized in that: The sealing cover (3) is slidably matched with the box body (2), and 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 fixing 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 the group of the fixed-length rod (5) is distributed along a third direction, and the third direction is perpendicular to the first direction; a group of the telescopic rod (6) is provided, and the 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 fixing 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 between the sealing cover (3) and the fixed-length rod (5) and an angle between the sealing cover (3) and the telescopic rod (6) are variable.

3. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 2 is characterized in that: The transmission device also includes: A limiting member (7) is fixed relative to the box body (2), and the limiting member (7) is suitable for limiting 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 of the fixed-length rods (5) and the second end of each of the telescopic rods (6) are connected to the sealing cover (3) via the connecting seat (8); the connecting seat (8) is at least capable of rotating relative to the fixed-length rods (5) and the telescopic rods (6) around a straight line parallel to the third direction; 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.

4. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 3 is characterized in that: The sealing cover (3) is provided with a circular slide groove, and each of the connecting seats (8) is embedded in the circular slide groove; The fixed-length rod (5) and the telescopic rod (6) are each provided in 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, the first sliding hole and the second sliding hole both penetrate the limiting member (7) along a second direction, the second direction being perpendicular to the first direction and the third 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.

5. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 4 is characterized in that: The transmission device also includes: 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 slide 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).

6. The variable volume pressure cycle hydrogen sealing material performance test bench according to any one of claims 3 to 5, characterized in that: The telescopic rod (6) comprises: A first rod body (11) is slidably matched with the limiting member (7); a sliding direction of the first rod body (11) relative to the limiting member (7) is along an axial direction of the first rod body (11); and a first end of the first rod body (11) is connected to the fixing frame (4); a second rod body (12) slidably matched with the first rod body (11) and the stopper (7); a sliding direction of the second rod body (12) relative to the first rod body (11) and the stopper (7) is along an axial direction of the second rod body (12); and a second end of the second rod body (12) is connected to the connecting seat (8); a third elastic member, disposed between the first rod body (11) and the second rod body (12), the third elastic member being adapted to cause the second rod body (12) to have a tendency to approach the fixing frame (4); The sliding control mechanism is capable of switching between an avoidance state and a limit state. In the avoidance state, the second rod body (12) is capable of sliding relative to the limit member (7) along a second direction, the second direction being perpendicular to the first direction and the third direction. In the limit state, the sliding control mechanism restricts the second rod body (12) from sliding in a direction approaching the fixing frame (4).

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

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

9. The variable volume pressure cycle hydrogen sealing material performance test bench according to any one of claims 2 to 5, characterized in that: The test box (1) further comprises: a first sliding member (19) slidably connected to a first side wall of the box body (2); a sliding direction of the first sliding member (19) relative to the first side wall is along a second direction, the second direction is perpendicular to the first direction and the third direction, and 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 have a tendency to approach the open end of the box body (2); A second sliding member (20) is slidably connected to a second side wall of the box body (2); the sliding direction of the second sliding member (20) relative to the second side wall is along the second direction; the second side wall is located on a side of the fixed-length rod (5) away from the telescopic rod (6); The second elastic member is arranged between the second sliding member (20) and the second side wall, and the second elastic member is suitable for causing the second sliding member (20) to have a tendency to move away from the open end of the box body (2).

10. The variable volume pressure cycle hydrogen sealing material performance test bench according to claim 9 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).

11. The variable volume pressure cycle hydrogen sealing material performance test bench according to any one of claims 1 to 5, 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), one end of the outer box body (22) and the inner box body (21) are both open, and the inner box body (21) is suitable for matching with the sealing cover (3); The shock-absorbing layer (23) is arranged between the outer box body (22) and the inner box body (21).

12. The variable volume pressure cycle hydrogen sealing material performance test bench according to any one of claims 1 to 5, 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).

13. The variable volume pressure cycle hydrogen sealing material performance test bench according to any one of claims 1 to 5, 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 body (2), and the rack (25) is suitable for approaching or moving away from the box body (2); A gear (26) capable of rotating about a fixed axis, and the gear (26) is meshed with the rack (25) for transmission; A driving member, drivingly connected to the gear (26); Wherein, when at least two of the test boxes (1) are provided, each of the gears (26) corresponds to two of the racks (25), each of the racks (25) is connected to a corresponding transmission device, and at least two of the gears (26) are provided, and each of the gears (26) is coaxially fixed.

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