Sealing performance detection equipment for valve sealing element

Abstract

The invention relates to the field of sealing element detection, and discloses a sealing performance detection device for a valve sealing element, which comprises an operation table, a first locking assembly is arranged on the operation table, the first locking assembly comprises a first air cylinder, and the output end of the first air cylinder is fixedly connected with a locking block through a piston rod. A linkage assembly is arranged on the side surface of the piston rod and used for synchronously transmitting driving force of the first air cylinder to the heat preservation cover and driving the heat preservation cover to move along the operation table. When the first locking assembly moves towards the end of the valve rod along the operation table and completes fixation of the valve rod, the heat preservation cover synchronously covers the stuffing box along with movement of the first locking assembly, a closed heat preservation space is formed, temperature fluctuation in the box is effectively reduced, uniform distribution of a temperature field is guaranteed, and heat preservation efficiency is improved. Meanwhile, the first air cylinder synchronously drives the first locking assembly and the heat preservation cover, an independent driving source does not need to be additionally arranged, and the heat preservation cover has the two-way adjusting capacity of continuous heat preservation and rapid heat dissipation.

Description

Technical Field

[0001] This invention relates to the field of sealing component testing technology, specifically to a sealing performance testing device for valve sealing components. Background Technology

[0002] Valve seals are the core functional components of various fluid conveying valves. Their sealing performance directly determines the valve's ability to block media and its operational safety. As industrial equipment develops towards high-parameter operating conditions, such as high-temperature media conveying, valve seals need to maintain stable sealing in high and low temperature environments. Therefore, valve seal sealing performance testing equipment needs to have high and low temperature testing capabilities. In existing technologies, such testing equipment usually sets heating wires and matching cooling components inside the stuffing box that houses the seal in order to adjust the temperature conditions during the testing process.

[0003] In actual testing, the valve stem and seal of the valve to be tested are placed in the stuffing box. The valve stem end is pressed by the pressure block to ensure that the seal on the outside of the valve stem is in contact with the inner wall of the stuffing box. Then, the heating wire or cooling component inside the stuffing box is activated to bring the internal environment of the stuffing box to the preset high temperature and low temperature test conditions. After that, the test medium is introduced into the stuffing box, and the gas leakage is detected by the leak detector on one side of the test tube.

[0004] Currently, valve seal sealing performance testing equipment only sets heating wires and cooling components inside the stuffing box to regulate temperature, but does not configure any heat insulation structure outside the stuffing box. During use, the heat and cold air inside the stuffing box will be quickly dissipated to the external environment during heating or cooling, resulting in large temperature fluctuations and uneven temperature field distribution inside the stuffing box. This makes it impossible to maintain the preset high and low temperature test conditions, resulting in a large deviation between the sealing performance test data and the actual performance under actual working conditions.

[0005] Therefore, the purpose of this invention is to provide a valve sealing performance testing device to overcome the shortcomings of the prior art. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a valve seal sealing performance testing device, which solves the problem that existing valve seal sealing performance testing devices suffer from large temperature fluctuations and large deviations in test data under high and low temperature conditions due to the lack of external insulation structure on the stuffing gland.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a valve sealing performance testing device, comprising an operating table, wherein a first locking assembly is provided on the operating table, the first locking assembly includes a first cylinder, the output end of the first cylinder is fixedly connected to a locking block via a piston rod, a linkage assembly is provided on the side surface of the piston rod, the linkage assembly is used to synchronously transmit the driving force of the first cylinder to a heat insulation cover, driving the heat insulation cover to move along the operating table, the linkage assembly includes a rotating shaft, a second gear and a first gear are fixedly connected on the side surface of the rotating shaft, two sets of second racks are meshed on the side surface of the second gear, a heat insulation cover is fixedly connected on the side surface of the second rack via a first connecting block, and a stuffing box is provided on the upper surface of the operating table; A fixed frame is fixedly connected to the lower surface of the operating table. A second locking component is provided on the fixed frame. The second locking component is used to lock the heat preservation position of the heat preservation cover or to unlock it to adjust the position of the heat preservation cover. The second locking component includes a second cylinder. A moving plate is fixedly connected to the output end of the second cylinder. A locking post is fixedly connected to the upper surface of the rotating shaft through the fixed plate. A locking hole adapted to the locking post is provided inside the heat preservation cover.

[0008] Preferably, the side surface of the piston rod is fixedly connected to a first gear via a connecting rod, the side surface of the first gear meshes with a first rack, the side surface of the rotating shaft is fixedly connected to a moving plate via a bearing, and the inner surface of the locking hole is slidably connected to a locking pin.

[0009] Preferably, the first connecting block has a first guide groove inside, the upper surface of the operating table is fixedly connected to a first guide rail, and the inner surface of the first guide groove is slidably connected to the first guide rail.

[0010] Preferably, a second connecting block is fixedly connected to the lower surface of the heat insulation cover, a second guide groove is provided inside the second connecting block, a second guide rail is fixedly connected to the upper surface of the operating table, and the inner surface of the second guide groove is slidably connected to the second guide rail.

[0011] Preferably, a fixing rod is fixedly connected to the lower surface of the operating table, a first groove is provided inside the fixing rod, a slider is slidably connected to the inner surface of the first groove, the rear surface of the slider is fixedly connected to a first rack, and a limit block is fixedly connected to the lower surface of the operating table.

[0012] Preferably, the side surface of the stuffing box is provided with a conduit, the inside of the stuffing box is provided with a constant temperature heating wire and a refrigeration component, the inside of the stuffing box is provided with a channel, and the inside of the channel is provided with a valve stem.

[0013] Preferably, a sealing element and a gland are fitted on the side surface of the valve stem, a fixing column is fixedly connected to the right surface of the stuffing box, a fixing block is slidably connected to the side surface of the fixing column, a detection tube is provided on the fixing block, and a second gas leak detector is fixedly connected to the end of the detection tube away from the fixing block.

[0014] Preferably, a pump body is fixedly connected to the rear surface of the operating table, and the output end of the pump body is connected to the stuffing box through a first connecting pipe and a second connecting pipe.

[0015] Preferably, a first gas leak detector is fixedly connected to the left surface of the stuffing box via an exhaust pipe and a third connecting pipe.

[0016] Preferably, the interior of the heat insulation cover is provided with a second groove, the interior of the heat insulation cover is provided with a third groove, and a support frame is fixedly connected to the lower surface of the operating table.

[0017] This invention provides a device for testing the sealing performance of valve seals. It has the following advantages: 1. This invention, by setting up an operating platform, a first locking component, a linkage component, a heat insulation cover, and a second locking component, allows the first locking component to move along the operating platform towards the valve stem end and fix the valve stem simultaneously. At the same time, the heat insulation cover moves with the first locking component and is synchronously placed over the outside of the stuffing box, forming a closed heat insulation space. This effectively reduces temperature fluctuations within the stuffing box, ensures a uniform temperature field distribution, and reduces the deviation between the test data and the actual performance under actual working conditions. At the same time, the heat insulation cover can isolate the high-temperature and low-temperature surfaces outside the stuffing box, preventing operators from accidentally touching them during the testing process and causing burns or frostbite.

[0018] 2. The present invention uses the first cylinder as the same driving component to simultaneously drive the fixing action of the first locking component and the moving action of the heat preservation cover. There is no need to set up an additional independent driving source. The setting of the same driving source simplifies the overall structure of the equipment, reduces the number of parts, and reduces the manufacturing cost and maintenance difficulty of the equipment.

[0019] 3. This invention, through the cooperation of the second locking component and the insulation cover, enables the insulation cover to have a two-way adjustable capability of continuous heat preservation and rapid heat dissipation. During the testing process, the second locking component can lock the insulation cover in the insulation position outside the stuffing box to ensure stable maintenance under high and low temperature conditions and meet the temperature stability requirements of the sealing test. After the test is completed, the insulation cover can be unlocked through the second locking component, and the insulation cover can be moved to a clearance position along the operating table according to the usage requirements, so that the outside of the stuffing box can directly contact the air to achieve rapid heat dissipation and cooling. The insulation cover can be flexibly adjusted and used during the use process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the stuffing box structure of the present invention; Figure 3 This is a schematic diagram of the operating table structure of the present invention; Figure 4 This is a schematic diagram of the fixing frame structure of the present invention; Figure 5 This is a schematic diagram of the structure of the first locking component of the present invention; Figure 6 This is a schematic diagram of the second locking component structure of the present invention; Figure 7 This is a schematic diagram of the thermal insulation cover structure of the present invention; Figure 8 This is an exploded view of the internal structure of the fixing rod of the present invention.

[0021] The components include: 1. Operating table; 2. Support frame; 3. First locking assembly; 301. First cylinder; 302. Piston rod; 303. Locking block; 4. Linkage assembly; 401. Connecting rod; 402. First rack; 403. First gear; 404. Rotating shaft; 405. Second gear; 406. Second rack; 407. First connecting block; 5. Insulation cover; 6. Fixing frame; 7. Second locking assembly; 701. Second cylinder; 702. Moving plate; 703. Fixing plate; 704. Locking post; 705. Locking hole; 8. Bearing; 9. First guide groove. ; 10. First guide rail; 11. Second connecting block; 12. Second guide groove; 13. Second guide rail; 14. Stuffing box; 15. Conduit; 16. Channel; 17. Valve stem; 18. Seal; 19. Gland; 20. Fixing post; 21. Fixing block; 22. Detection tube; 23. Pump body; 24. First connecting tube; 25. Second connecting tube; 26. Exhaust pipe; 27. Limiting block; 28. Fixing rod; 29. ​​First groove; 30. Slider; 31. Third connecting tube; 32. First gas leak detector; 33. Second groove; 34. Third groove. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see the appendix Figure 1 -Appendix Figure 8This invention provides a valve sealing performance testing device, including an operating table 1, on which a first locking component 3 is provided. The first locking component 3 includes a first cylinder 301, and the output end of the first cylinder 301 is fixedly connected to a locking block 303 through a piston rod 302.

[0024] Specifically, the operating table 1 serves as the foundation for the sealing performance testing equipment of the entire valve seal 18, and is used to integrate and install all functional components. The horizontal structure of the operating table 1 ensures the installation accuracy of each component and provides stable support for subsequent actions such as fixing the valve stem 17 and moving the insulation cover 5. The first cylinder 301 serves as the power output source and can output linear driving force according to the preset pressure. The driving force is transmitted to the locking block 303 through the piston rod 302. The end face of the locking block 303 is designed to fit the end of the valve stem 17, so that it can form a surface contact when contacting the end of the valve stem 17, which not only ensures the firmness of the lock, but also avoids deformation of the end of the valve stem 17 due to local pressure.

[0025] A linkage assembly 4 is provided on the side surface of the piston rod 302. The linkage assembly 4 is used to synchronously transmit the driving force of the first cylinder 301 to the heat preservation cover 5, driving the heat preservation cover 5 to move along the operating table 1. The linkage assembly 4 includes a rotating shaft 404. A second gear 405 and a first gear 403 are fixedly connected to the side surface of the rotating shaft 404. Two sets of second racks 406 are meshed on the side surface of the second gear 405. The heat preservation cover 5 is fixedly connected to the side surface of the second rack 406 through a first connecting block 407. The first gear 403 is fixedly connected to the side surface of the piston rod 302 through a connecting rod 401. The side surface of the first gear 403 is meshed with the first rack 402. The side surface of the rotating shaft 404 is fixedly connected to the moving plate 702 through a bearing 8.

[0026] Specifically, when the first cylinder 301 drives the piston rod 302 to extend to the left, i.e., to move towards the valve rod 17, the piston rod 302 drives the first rack 402 to move synchronously via the connecting rod 401. Since the first gear 403 meshes with the first rack 402, the first gear 403 will rotate during the movement, driving the coaxially fixed second gear 405 to rotate synchronously. The second gear 405 meshes with two sets of second racks 406, and the rotating second gear 405 drives the two sets of second racks 406 in opposite directions. The movement is synchronized, and then the first connecting block 407 drives the insulation cover 5 to close towards the stuffing box 14, so that the piston rod 302 extends, the locking block 303 fixes the valve rod 17 and the insulation cover 5 close simultaneously. The closing of the insulation cover 5 can effectively reduce the temperature fluctuation in the duct 16, ensure the uniform distribution of the temperature field, and reduce the deviation between the test data and the actual performance under the actual working conditions. At the same time, the insulation cover 5 can isolate the high temperature and low temperature surfaces outside the stuffing box 14, and prevent the operator from accidentally touching them during the test process, which may cause burns or frostbite.

[0027] Meanwhile, the rotating shaft 404 is connected to the moving plate 702 through the bearing 8. The bearing 8 can reduce the frictional resistance when the rotating shaft 404 rotates, ensuring the smoothness and synchronization accuracy of the transmission of the first gear 403 and the second gear 405, avoiding the lag in the movement of the insulation cover 5 due to transmission jamming, and ensuring that the valve stem 17 and the seal 18 are fixed while the stuffing box 14 quickly forms a closed insulation space.

[0028] The upper surface of the operating table 1 is provided with a stuffing box 14, the side surface of the stuffing box 14 is provided with a wire conduit 15, the inside of the heat insulation cover 5 is provided with a second groove 33, the inside of the heat insulation cover 5 is provided with a third groove 34, and the lower surface of the operating table 1 is fixedly connected with a support frame 2.

[0029] Specifically, the stuffing box 14 is the core structure providing high and low temperature detection capabilities. The channel 16 inside the stuffing box 14 is used to accommodate detection components such as the valve stem 17 and the seal 18. The integrated thermostatic heating wire and cooling component can adjust the temperature inside the channel 16 according to the detection requirements, realizing multi-condition detection such as high temperature, low temperature and normal temperature. The wire guide tube 15 is used to run the power supply wires of the thermostatic heating wire and cooling component and the temperature sensor signal line. The wire guide tube 15 and the third groove 34 can prevent heat and cold air in the channel 16 from leaking from the wire passage, further improving the heat preservation effect. The heat preservation cover 5 is made of a material with high temperature resistance and excellent heat insulation performance. The second groove 33 inside the insulation cover 5 is designed to fit the outer contour of the stuffing box 14. When the insulation cover 5 is closed, the second groove 33 can fit tightly with the outer surface of the stuffing box 14 to form a closed insulation chamber, reducing the heat exchange between the temperature inside the duct 16 and the external environment, ensuring a uniform temperature field distribution inside the duct 16, and reducing the deviation between the test data and the actual working conditions. The support frame 2 is made of high-strength metal material. The height design of the support frame 2 ensures that the operating table 1 is at a height that is easy to operate, while providing installation space for components such as the fixing frame 6 and fixing rod 28 on the lower surface of the operating table 1, ensuring the stability of the overall structure of the equipment.

[0030] A fixed frame 6 is fixedly connected to the lower surface of the operating table 1. A second locking component 7 is provided on the fixed frame 6. The second locking component 7 is used to lock the heat preservation position of the heat preservation cover 5 or to unlock it to adjust the position of the heat preservation cover 5. The second locking component 7 includes a second cylinder 701. A moving plate 702 is fixedly connected to the output end of the second cylinder 701. A locking post 704 is fixedly connected to the upper surface of the rotating shaft 404 through a fixed plate 703. A locking hole 705 adapted to the locking post 704 is provided inside the heat preservation cover 5. The inner surface of the locking hole 705 is slidably connected to the locking post 704.

[0031] Specifically, the fixing frame 6 is used to fix and install the second locking component 7. The structural design of the fixing frame 6, which is perpendicular to the operating table 1, can ensure that the driving force of the second cylinder 701 is transmitted in the vertical direction, providing a stable guide for the lifting and lowering of the locking pin 704. The second locking component 7 is used to realize the bidirectional adjustment of continuous heat preservation and rapid heat dissipation of the heat preservation cover 5. When the heat preservation cover 5 is closed to the heat preservation position, the second cylinder 701 drives the moving plate 702 to move upward, driving the rotating shaft 404 and the fixing plate 703 to rise synchronously, so that the locking pin 704 is inserted into the corresponding locking hole 705 of the heat preservation cover 5. The movement of the heat preservation cover 5 is restricted by the cooperation of the locking pin 704 and the locking hole 705, thereby locking the heat preservation position and ensuring that the heat preservation cover 5 always covers the stuffing box 14 during the testing process, maintaining the stability of high and low temperature conditions.

[0032] When multiple sets of valve stems 17 and seals 18 need to undergo low-temperature testing after high-temperature testing, or when multiple sets of valve stems 17 and seals 18 need to undergo high-temperature testing after low-temperature testing, or when the insulation cover 5 is not applicable and internal hot or cold air needs to be dissipated, the first cylinder 301 is activated, the piston rod 302 and locking block 303 move to a fixed position in contact with the valve stem 17, and at the same time the first rack 402 contacts the limit block 27. The second cylinder 701 is activated to drive the moving plate 702 to move downward, the locking pin 704 is pulled out from the locking hole 705, the insulation cover 5 is unlocked, the first rack 402 contacts the limit block 27 to ensure that the first rack 402 meshes with the first gear 403, the first cylinder 301 is activated to drive the piston rod 302 to retract in the opposite direction, and through the linkage component 4, the insulation cover 5 is driven to separate to both sides and move to an avoidance position, so that the outside of the stuffing box 14 directly contacts the air, realizing rapid heat dissipation or cooling, solving the problem that existing equipment needs to be naturally cooled for a long time after testing, and improving testing efficiency.

[0033] The first connecting block 407 has a first guide groove 9 inside, and the upper surface of the operating table 1 is fixedly connected to the first guide rail 10. The inner surface of the first guide groove 9 is slidably connected to the first guide rail 10.

[0034] Specifically, the first connecting block 407 serves as the connection medium between the second rack 406 and the insulation cover 5. The first guide groove 9 inside the first connecting block 407 and the first guide rail 10 on the operating table 1 form a sliding guide mechanism. When the second rack 406 drives the first connecting block 407 to move, the first guide groove 9 slides along the first guide rail 10, which can precisely limit the movement direction of the insulation cover 5, preventing the insulation cover 5 from shifting left or right or tilting during the closing or opening process, ensuring that the insulation cover 5 can accurately cover the stuffing box 14, so that the second groove 33 and the outer surface of the stuffing box 14 are tightly fitted to form a well-sealed insulation space.

[0035] The lower surface of the heat insulation cover 5 is fixedly connected to a second connecting block 11, and the interior of the second connecting block 11 is provided with a second guide groove 12. The upper surface of the operating table 1 is fixedly connected to a second guide rail 13, and the inner surface of the second guide groove 12 is slidably connected to the second guide rail 13.

[0036] Specifically, the second connecting block 11 and the first connecting block 407 form a double-connection support structure, jointly bearing the weight of the insulation cover 5 and guiding its movement. The second guide groove 12 inside the second connecting block 11 cooperates with the second guide rail 13 on the operating table 1 to form a second set of sliding guide mechanisms. This, together with the first guide groove 9 and the first guide rail 10, forms a bidirectional guide, further improving the stability and accuracy of the movement of the insulation cover 5. The double guide structure can effectively disperse the force on the insulation cover 5 during movement, avoiding wear or deformation caused by concentrated force on a single guide mechanism, thus extending the service life of the equipment. At the same time, the second guide rail 13 is set parallel to the first guide rail 10, ensuring that the insulation cover 5 always moves in a straight line, ensuring that the two sets of insulation covers 5 can be accurately closed, avoiding insulation gaps caused by deviations in the movement trajectory, ensuring the sealing of the enclosed insulation space, minimizing heat and cold air loss, and providing a stable temperature environment for the high and low temperature sealing performance testing of the sealing component 18.

[0037] A fixing rod 28 is fixedly connected to the lower surface of the operating table 1. A first groove 29 is provided inside the fixing rod 28. A slider 30 is slidably connected to the inner surface of the first groove 29. The rear surface of the slider 30 is fixedly connected to the first rack 402. A limit block 27 is fixedly connected to the lower surface of the operating table 1.

[0038] Specifically, the first groove 29 inside the fixed rod 28 provides space for the sliding of the slider 30. The slider 30 is fixedly connected to the first rack 402, which guides the movement of the first rack 402, ensuring that the first rack 402 and the first gear 403 always maintain a good meshing state. The sliding cooperation between the slider 30 and the first groove 29 can reduce the frictional resistance when the first rack 402 is adjusted, avoid transmission jamming due to poor meshing, and ensure the synchronous transmission accuracy of the linkage component 4. The limit block 27 is set on the movement path of the first rack 402 to limit the maximum movement stroke of the first rack 402. When multiple sets of valve stems 17 and seals 18 need to undergo low-temperature testing after completing high-temperature testing, or when multiple sets of valve stems 17 and seals 18 need to undergo high-temperature testing after completing low-temperature testing, or when the insulation cover 5 is not used and internal hot or cold air needs to be dissipated, the first cylinder 301 is activated, the piston rod 302 and locking block 303 move to a fixed position in contact with the valve stem 17, and at the same time the first rack 402 contacts the limiting block 27. The limiting block 27 is set to ensure that when the second locking component 7 is used, the first rack 402 and the first gear 403 are precisely meshed, and at the same time, the locking pin 704 can accurately enter the locking hole 705.

[0039] The stuffing box 14 is equipped with a constant temperature heating wire and a cooling component. The stuffing box 14 is equipped with a channel 16. The channel 16 is equipped with a valve stem 17. The side surface of the valve stem 17 is fitted with a sealing element 18 and a pressure cap 19. The right surface of the stuffing box 14 is fixedly connected to a fixing post 20. The side surface of the fixing post 20 is slidably connected to a fixing block 21. The fixing block 21 is equipped with a detection tube 22. The end of the detection tube 22 away from the fixing block 21 is fixedly connected to a second gas leak detector.

[0040] Specifically, the constant-temperature heating wire and cooling assembly inside the stuffing box 14 are connected to a power source via a conduit 15, allowing for precise temperature adjustment within the duct 16 according to testing requirements, thus meeting the sealing performance testing needs of the seal 18 under different environments. It should be noted that the application of the constant-temperature heating wire and cooling assembly, along with the temperature control method, are existing technologies; their core function is to provide high and low temperature baseline conditions for the testing of the seal 18. The inner wall of the duct 16 is designed with a smooth surface to reduce friction with the seal 18 while ensuring a uniform temperature distribution within the duct 16. The valve stem 17 serves as the assembly carrier for the seal 18, with the seal 18 fitted onto its side surface as the object to be tested. The gland 19 is used to press the seal 18 tightly within the duct 16, ensuring a close fit between the seal 18 and the inner wall of the duct 16, as well as the outer surface of the valve stem 17, simulating the assembly state of the seal 18 in an actual valve. The fixing post 20 guides the movement of the fixing block 21, which can slide along the fixing post 20 to a position where it fits against the gland 19. The seal 18 is further positioned to prevent it from shifting during the detection process. The detection tube 22 is connected to the gas channel inside the fixed block 21, which can collect gas samples in the duct 16 in real time. The second gas leak detector detects the amount of gas leakage through the detection tube 22. When the sealing performance of the seal 18 is poor, the detection medium in the duct 16 will leak through the sealing gap. The second gas leak detector can quickly capture the leakage signal. At the same time, under the heat preservation effect of the heat insulation cover 5, the influence of temperature fluctuation on the leakage detection accuracy can be avoided, ensuring the authenticity and reliability of the detection data.

[0041] A pump body 23 is fixedly connected to the rear surface of the operating table 1. The output end of the pump body 23 is connected to the stuffing box 14 through the first connecting pipe 24 and the second connecting pipe 25. A first gas leak detector 32 is fixedly connected to the left surface of the stuffing box 14 through the exhaust pipe 26 and the third connecting pipe 31.

[0042] Specifically, the pump body 23 is the source of the detection medium. The pump body 23 is used to deliver a stable pressure detection medium into the duct 16 of the stuffing box 14. The output end of the pump body 23 is connected to the stuffing box 14 through the first connecting pipe 24 and the second connecting pipe 25. The exhaust pipe 26 on the left surface of the stuffing box 14 has the dual functions of pressure balancing and leakage detection. When the pressure in the duct 16 reaches the detection threshold, the excess medium can be discharged through the exhaust pipe 26 to avoid pressure overload damage to the seal 18 or the stuffing box 14. At the same time, the exhaust pipe 26 is connected to the first gas leak detector 32 through the third connecting pipe 31 to form a closed-loop gas path for pressure supply, pressure holding and detection. The first gas leak detector 32 can monitor the pressure change and medium flow in the exhaust pipe 26 in real time. If there is a leak in the seal 18, the pressure in the duct 16 will be lost through the sealing gap, resulting in a drop in pressure or abnormal flow in the exhaust pipe 26.

[0043] The control panel 1 is equipped with a controller. The first cylinder 301, the second cylinder 701, the pump body 23, the constant temperature heating wire, the refrigeration component, the first gas leak detector 32, and the second gas leak detector in this application are all electrically connected to the controller. The controller is equipped with a PLC control system, which controls the opening and closing of the above components and the adjustment of parameters such as pressure, temperature, and stroke, which are all existing technologies.

[0044] Working principle: When using this device, place the valve stem 17 and seal 18 to be tested inside the duct 16, insert the pressure cap 19 onto the valve stem 17, and pass the fixing hole on the fixing block 21 through the fixing post 20. Start the first cylinder 301 to drive the piston rod 302 and locking block 303 to move. The locking block 303 fixes one side of the fixing block 21, that is, fixes the right end of the valve stem 17. The movement of the piston rod 302 drives the connecting rod 401 and the first rack 402 to move, and the first gear 403 moves... During the movement of the first rack 402, the rotation drives the rotating shaft 404 and the second gear 405 to rotate. The second rack 406, the first connecting block 407, and the insulation cover 5 on both sides of the second gear 405 move in opposite directions toward the center. When the two sets of insulation covers 5 move to the fit state, the stuffing box 14 is placed between the two sets of insulation covers 5. The heating wire inside the insulation cover 5 is activated. During the sealing test, the two sets of insulation covers 5 form a closed insulation space, which can effectively reduce the temperature fluctuation in the duct 16 and ensure a uniform temperature field distribution.

[0045] When multiple sets of valve stems 17 and seals 18 are subjected to high-temperature testing, the second cylinder 701 is activated to move the moving plate 702, rotating shaft 404, fixed plate 703, and locking pin 704, so that the locking pin 704 enters the locking hole 705 to lock the heat insulation cover 5. At the same time, the first rack 402 and the first gear 403 no longer mesh, and the rotating shaft 404 still meshes with the two sets of second racks 406 after moving. When the first cylinder 301 is activated to move the piston rod 302 and locking block 303, the locking block 303 no longer limits the valve stem 17, so the valve stem 17 and seals 18 in the duct 16 can be replaced, while still ensuring the sealing and heat insulation effect of the heat insulation cover 5.

Claims

1. A valve seal sealing performance testing device, comprising an operating table (1), characterized in that, The operating table (1) is provided with a first locking component (3), which includes a first cylinder (301). The output end of the first cylinder (301) is fixedly connected to a locking block (303) via a piston rod (302). The side surface of the piston rod (302) is provided with a linkage component (4). The linkage component (4) is used to synchronously transmit the driving force of the first cylinder (301) to the heat insulation cover (5) and drive the heat insulation cover (5) to move along the operating table (1). The linkage component (4) includes a rotating shaft (404). The side surface of the rotating shaft (404) is fixedly connected to a second gear (405) and a first gear (403). The side surface of the second gear (405) is meshed with two sets of second racks (406). The side surface of the second rack (406) is fixedly connected to the heat insulation cover (5) via a first connecting block (407). The upper surface of the operating table (1) is provided with a stuffing box (14). A fixed frame (6) is fixedly connected to the lower surface of the operating table (1). A second locking component (7) is provided on the fixed frame (6). The second locking component (7) is used to lock the heat preservation position of the heat preservation cover (5) or unlock it to adjust the position of the heat preservation cover (5). The second locking component (7) includes a second cylinder (701). A moving plate (702) is fixedly connected to the output end of the second cylinder (701). A locking post (704) is fixedly connected to the upper surface of the rotating shaft (404) through a fixed plate (703). A locking hole (705) adapted to the locking post (704) is provided inside the heat preservation cover (5).

2. The valve sealing performance testing equipment according to claim 1, characterized in that, The side surface of the piston rod (302) is fixedly connected to the first rack (402) via the connecting rod (401), the side surface of the first gear (403) meshes with the first rack (402), the side surface of the rotating shaft (404) is fixedly connected to the moving plate (702) via the bearing (8), and the inner surface of the locking hole (705) is slidably connected to the locking pin (704).

3. The valve seal sealing performance testing equipment according to claim 1, characterized in that, The first connecting block (407) has a first guide groove (9) inside, and the upper surface of the operating table (1) is fixedly connected to a first guide rail (10). The inner surface of the first guide groove (9) is slidably connected to the first guide rail (10).

4. The valve seal sealing performance testing equipment according to claim 1, characterized in that, The lower surface of the heat insulation cover (5) is fixedly connected to a second connecting block (11), and the interior of the second connecting block (11) is provided with a second guide groove (12). The upper surface of the operating table (1) is fixedly connected to a second guide rail (13), and the inner surface of the second guide groove (12) is slidably connected to the second guide rail (13).

5. The valve seal sealing performance testing equipment according to claim 2, characterized in that, A fixing rod (28) is fixedly connected to the lower surface of the operating table (1). A first groove (29) is provided inside the fixing rod (28). A slider (30) is slidably connected to the inner surface of the first groove (29). The rear surface of the slider (30) is fixedly connected to the first rack (402). A limit block (27) is fixedly connected to the lower surface of the operating table (1).

6. The valve seal sealing performance testing equipment according to claim 1, characterized in that, The side surface of the stuffing box (14) is provided with a wire tube (15), the stuffing box (14) is provided with a constant temperature heating wire and a refrigeration component, the stuffing box (14) is provided with a channel (16), and the channel (16) is provided with a valve stem (17).

7. The valve seal sealing performance testing equipment according to claim 6, characterized in that, The valve stem (17) is fitted with a sealing element (18) and a gland (19) on its side surface. A fixing column (20) is fixedly connected to the right surface of the stuffing box (14). A fixing block (21) is slidably connected to the side surface of the fixing column (20). A detection tube (22) is provided on the fixing block (21). A second gas leak detector is fixedly connected to the end of the detection tube (22) away from the fixing block (21).

8. The valve seal sealing performance testing equipment according to claim 1, characterized in that, The rear surface of the operating table (1) is fixedly connected to a pump body (23), and the output end of the pump body (23) is connected to the stuffing box (14) through a first connecting pipe (24) and a second connecting pipe (25).

9. The valve seal sealing performance testing equipment according to claim 1, characterized in that, The left surface of the stuffing box (14) is fixedly connected to the first gas leak detector (32) via the exhaust pipe (26) and the third connecting pipe (31).

10. The valve seal sealing performance testing device according to claim 1, characterized in that, The heat insulation cover (5) has a second groove (33) inside and a third groove (34) inside. The lower surface of the operating table (1) is fixedly connected to a support frame (2).

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