A saturated carbon dioxide competitive adsorption device

Abstract

The application relates to the technical field of adsorption devices, in particular to a saturated carbon dioxide competitive adsorption device. The device comprises a shell, two plugging rods are arranged in the shell, a monitoring cavity is arranged in the middle of the shell, the end portions of the plugging rods are arranged in the monitoring cavity, a heat shrink tube is arranged on the end portions of the two plugging rods, and a rock core sample is filled in the heat shrink tube. The device further comprises a sealing ring, a ring groove is arranged on the surface of the plugging rod, the sealing ring is arranged in the ring groove, and the sealing ring is arranged between the heat shrink tube and the plugging rod. The gas in the gas storage space is pushed into the sealing ring through the pipeline, the sealing ring is expanded, the contact pressure between the sealing ring and the heat shrink tube is increased, the sealing effect between the heat shrink tube and the plugging rod is improved from the inside, the experimental gas leakage is avoided, and the accuracy of the experimental results is ensured.

Description

Technical Field

[0001] This invention relates to the field of adsorption devices, and more particularly to a competitive adsorption device for saturated carbon dioxide. Background Technology

[0002] Shale contains abundant shale gas. Current technologies primarily involve collecting core samples, preparing them, and conducting preliminary experiments to test their porosity, grain size, and mineral composition. Samples with comparable parameters are then selected for displacement adsorption experiments, employing a single-variable approach to test the effects of different temperatures, pressures, and injection times on the adsorption of shale gas by carbon dioxide. This experimental data not only provides crucial support for shale gas extraction but also, in CO2 enhanced oil recovery (EOR) technology, the adsorption characteristics of reservoir rocks, such as shale and sandstone, directly influence the migration patterns of carbon dioxide within the reservoir, its miscibility with crude oil, and the final oil displacement effect. Therefore, carbon dioxide adsorption experimental data from core samples are also a vital foundation for optimizing CO2 EOR schemes and improving oil and gas recovery rates.

[0003] In displacement adsorption experiments, core samples are often packed in heat-shrink tubing. Uneven heating of the tubing can reduce the seal between the tubing and the sealing rod. During subsequent gas introduction, gas enters the tubing, increasing internal pressure. As pressure accumulates, this pressure can locally push up the tubing at the sealing interface, further enlarging the gap and exacerbating gas leakage. This leakage causes the actual gas flow path to deviate from the pre-designed path, distorting key data such as gas flow rate and pressure. It also directly interferes with the accurate assessment of the core sample's seepage characteristics or displacement effect, ultimately affecting the reliability of the experimental results. If these results are used to analyze the adsorption characteristics of reservoir rocks in CO2 flooding technology, the distorted data will lead to misjudgments of the reservoir's carbon dioxide adsorption capacity, affecting the setting of core parameters such as CO2 injection rate and pressure. This is detrimental to improving the efficiency and controlling costs of CO2 flooding technology in field applications. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies where uneven heating of the heat shrink tubing leads to a reduced sealing effect between the heat shrink tubing and the sealing rod, thus affecting the reliability of experimental results. Therefore, this invention proposes a saturated carbon dioxide competitive adsorption device.

[0005] To achieve the above objectives, the technical solution adopted by this invention is as follows: a saturated carbon dioxide competitive adsorption device, comprising a shell, two sealing rods inserted inside the shell, a monitoring cavity formed in the middle of the shell, the ends of the sealing rods being inserted into the monitoring cavity, and a heat-shrinkable tube sleeved on the ends of the two sealing rods, the heat-shrinkable tube containing a core sample, and further comprising: A sealing ring is provided, wherein a groove is formed on the surface of the sealing rod, and the sealing ring is fitted and fixed in the groove. The sealing ring is located between the heat shrink tubing and the sealing rod. A gas delivery channel is provided, which is opened through the inside of the sealing rod. The gas delivery channel is connected to an external gas delivery device, and a compression chamber is provided at the end of the gas delivery channel. Two extrusion blocks are slidably disposed inside the extrusion chamber. An air storage space is formed between the opposite sides of the two extrusion blocks and the inner wall of the extrusion chamber. The air storage space is connected to the sealing ring through a pipe. A first spring is fixed between the extrusion block and the inner wall of the air storage space. A first guide surface is provided at the bottom of the extrusion block. A pusher is disposed in the gas delivery channel. Under the action of air pressure, the pusher is used to push the extrusion block to compress the gas storage space.

[0006] Specifically, in the displacement adsorption experiment, a heat shrink tubing is first placed over the outside of the core sample, and then two sealing rods are inserted into both ends of the heat shrink tubing. By heating the heat shrink tubing, the heat shrink tubing, sealing rods, and core sample are tightly connected, forming a whole. This whole is then inserted into the housing, with the core sample located inside the monitoring chamber. Subsequently, by filling the monitoring chamber with a confining pressure medium and supplying experimental gas into the sealing rods, the gas in the core sample is replaced by the experimental gas, thus completing the displacement adsorption experiment. When heat shrink tubing is heated unevenly, the sealing effect between the tubing and the sealing rod decreases. During subsequent gas introduction, gas enters the tubing, causing the internal pressure to rise. As the pressure accumulates, it may locally push up the tubing at the sealing interface between the tubing and the sealing rod, further expanding the gap size and exacerbating gas leakage. This leakage phenomenon causes the actual gas flow path in the experiment to deviate from the preset design, resulting not only in distorted measurements of key data such as gas flow rate and pressure, but also directly interfering with the accurate judgment of the seepage characteristics or displacement effect of the core sample, ultimately affecting the reliability of the experimental results. Especially when the gas flow rate is too high, the impact of the gas on the weak sealing area will be significantly enhanced, and the interference with the experimental results will be further aggravated. This invention can solve the above problems. The specific working method is as follows: During the process of introducing experimental gas, such as carbon dioxide gas, into the sealing rod, the experimental gas flows along the gas delivery channel and pushes the pusher towards the extrusion block. Under the guidance of the first guide surface, the pusher pushes the extrusion block into the gas storage space, and pushes the gas in the gas storage space into the sealing ring through the pipe. The sealing ring is made of hollow elastic rubber material. After the gas enters the sealing ring, it causes the sealing ring to expand, increasing the contact pressure between the sealing ring and the heat shrink tubing, filling the gap between the sealing rod and the heat shrink tubing, thereby improving the sealing effect between the heat shrink tubing and the sealing rod from the inside, thus avoiding the leakage of experimental gas and ensuring the accuracy of the experimental results.

[0007] Preferably, the pushing component includes a bracket, which is fixed inside the gas delivery channel. A movable rod is slidably connected to the bracket. A limit plate is fixed to one end of the movable rod, and a second spring is fixed between the limit plate and the bracket. A piston rod is fixed to the other end of the movable rod, and a first pushing plate is fixed to the end of the piston rod. The first pushing plate is disposed in the extrusion chamber. An inclined surface is formed on the side of the first pushing plate near the extrusion block, and a first connecting groove is formed on the inclined surface. A second connecting groove is formed on the side of the piston rod away from the first pushing plate.

[0008] Specifically, during the process of the experimental gas entering the gas delivery channel, under the action of gas pressure, the piston rod can be pushed to move inside the gas delivery channel. The piston rod drives the first push plate to move. The inclined surface on the first push plate contacts the first guide surface on the extrusion block. Under the guidance of the inclined surface and the first guide surface, the extrusion block is pushed to move into the gas storage space, thereby completing the pushing function. During the movement of the piston rod, the moving rod and the limiting plate will move synchronously. During this process, the limiting plate will compress the second spring to store energy. When the gas supply stops, the limiting plate, the moving rod, and the piston rod can be pushed to reset under the elastic force of the second spring. As the limiting plate gradually approaches the support, when the support rod at its end contacts the support, the piston rod stops moving due to the blockage of the support. At this time, the second connecting groove connects the gas delivery channel and the extrusion chamber. Gas can enter the extrusion chamber through the second connecting groove and can be discharged from the other end of the first connecting groove and the gas delivery channel into the heat shrink tube for subsequent operations of the displacement adsorption experiment.

[0009] Preferably, a second push plate is slidably connected inside the extrusion chamber. The second push plate has an inclined surface on the side near the extrusion block. A second guide surface is formed on the surface of the extrusion block. An expansion groove is formed on the side of the second push plate away from the first push plate. A through groove is formed on the inner wall of the expansion groove. A connecting frame is fixed in the through groove. A slide rod is slidably connected to the connecting frame. A sealing disc is fixed at one end of the slide rod. The sealing disc is embedded in the expansion groove. A third spring is fixed between the sealing disc and the connecting frame. A flow guide channel is formed inside the push member. A one-way valve is fixed in the flow guide channel. The one-way valve is used to restrict the movement of the conveying medium from the gas delivery channel into the flow guide channel. A blocking frame is fixed on the inner wall of the flow guide channel.

[0010] Preferably, a slider is fixed on the inclined surface of the second push plate, and a groove is provided on the second guide surface, with the slider slidably connected in the groove.

[0011] Preferably, a pressure sensor is fixed on the inner wall of the gas storage space, a pressure relief chamber is provided on one side of the gas storage space, an electric actuator is fixed inside the pressure relief chamber, a piston plate is fixed to the movable end of the electric actuator, and the piston plate is in sealed contact with the inner wall of the pressure relief chamber.

[0012] Preferably, a mounting base is fixed on the top surface of the extrusion block, a flipping rod is rotatably connected to the mounting base, a torsion spring is sleeved on the rotating shaft of the flipping rod, one end of the torsion spring is fixed to the flipping rod, the other end of the torsion spring is fixed to the mounting base, and a roller is rotatably connected to the flipping rod in one direction.

[0013] Preferably, a support plate is fixed on the extrusion block, the support plate is in contact with the bottom of the flipping rod, a limiting block is fixed on the inner wall of the gas storage space, a slope is formed on the bottom surface of the limiting block, a groove is formed on the surface of the limiting block, the limiting block has a hollow structure, an insertion port is formed at one end of the limiting block, two limiting frames are fixed on the inner wall of the insertion port, a movable plug is slidably connected inside the limiting block, the movable plug is located between the two limiting frames, one end of the movable plug is fixed to the piston plate through an elastic connecting rod, an exhaust hole communicating with the inside of the limiting block is formed on the surface of the groove, and a pushing membrane is fixed on the inner wall of the groove.

[0014] Preferably, the elastic connecting rod includes a first connecting rod, a fourth spring, and a second connecting rod. The first connecting rod is fixed to the piston plate, the second connecting rod is fixed to the movable plug, and the fourth spring is fixed between the first connecting rod and the second connecting rod.

[0015] Preferably, the first connecting rod has a damping groove inside, and a damping rod is inserted into the damping groove. The damping rod is made of an elastic material.

[0016] Preferably, a first friction surface is provided on the side of the pushing diaphragm away from the exhaust hole, and a second friction surface is provided on the surface of the roller.

[0017] Compared with the prior art, the present invention has the following beneficial effects: I. In the process of introducing experimental gas, such as carbon dioxide, into the sealing rod, the experimental gas flows along the gas delivery channel and pushes the pusher towards the extrusion block. Under the guidance of the first guide surface, the pusher pushes the extrusion block into the gas storage space, and the gas in the gas storage space is pushed into the sealing ring through the pipe. The sealing ring is made of hollow elastic rubber. After the gas enters the sealing ring, it causes the sealing ring to expand, increasing the contact pressure between the sealing ring and the heat shrink tubing, filling the gap between the sealing rod and the heat shrink tubing, thereby improving the sealing effect between the heat shrink tubing and the sealing rod from the inside, thus preventing the experimental gas from leaking and ensuring the accuracy of the experimental results.

[0018] Second, during the discharge process, the invention will push the second push plate to move, and the inclined surface on the second push plate will contact the second guide surface, thereby pushing the extrusion block to move upward. Similarly, the extrusion block will extrude the gas in the gas storage space, causing the sealing ring to expand and improving the sealing performance. This will ensure that both ends of the heat shrink tube are effectively sealed, eliminating the need to judge the air intake direction of the two sealing rods. Regardless of which end the air enters, the sealing ring can be effectively sealed, ensuring the sealing performance of both ends of the heat shrink tube.

[0019] Third, in the process of piston plate resetting, the piston plate pushes the first connecting rod to move. Under the damping action of the damping rod and the damping groove, the first connecting rod can directly push the second connecting rod and the moving plug to reset during the pushing process, until the moving plug is blocked by another limiting frame. As the piston plate continues to push, under rigid pushing, the damping rod gradually deforms and inserts into the damping groove, and the fourth spring retracts and resets. Thus, during the pushing and resetting process, the piston plate can directly push the moving plug to move without waiting for the fourth spring to retract, avoiding the situation where the gas in the gas storage space is difficult to compress, resulting in difficulty in moving the piston plate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention.

[0022] Figure 3 For the present invention Figure 2 A magnified structural diagram at point A in the diagram.

[0023] Figure 4 For the present invention Figure 3 A magnified structural diagram at point B in the diagram.

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the extrusion block of the present invention.

[0025] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged C structure in the diagram.

[0026] Figure 7 This is a schematic diagram of the limiting block, the first connecting rod, the fourth spring, and the second connecting rod of the present invention.

[0027] Figure 8 This is a schematic diagram of the cross-sectional structure of the limiting block of the present invention.

[0028] In the diagram: 1. Shell; 2. Sealing rod; 3. Monitoring chamber; 4. Heat shrink tubing; 5. Sealing ring; 6. Annular groove; 7. Gas delivery channel; 8. Extrusion chamber; 9. Extrusion block; 10. Gas storage space; 11. Pipeline; 12. First spring; 13. First guide surface; 14. Bracket; 15. Moving rod; 16. Limiting plate; 17. Second spring; 18. Piston column; 19. First push plate; 20. First connecting groove; 21. Second connecting groove; 22. Second push plate; 23. Second guide surface; 24. Expansion groove; 25. Through groove; 26. Connecting frame; 27. 28. Slide rod; 29. ​​Sealing disc; 30. Third spring; 31. Flow guide channel; 32. One-way valve; 33. Blocking frame; 34. Slider; 35. Slide groove; 36. Pressure relief chamber; 37. Electric actuator; 38. Piston plate; 39. Mounting base; 40. Flipping rod; 41. Torsion spring; 42. Roller; 43. Support plate; 44. Limiting block; 45. Groove; 46. Insertion port; 47. Limiting frame; 48. Moving plug; 49. Exhaust port; 50. Pushing membrane; 51. First connecting rod; 52. Fourth spring; 53. Second connecting rod; 54. Damping groove; 55. Damping rod. Detailed Implementation

[0029] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0030] like Figures 1 to 8The illustrated saturated carbon dioxide competitive adsorption device includes a housing 1, with two sealing rods 2 inserted inside the housing 1. A monitoring cavity 3 is formed in the middle of the housing 1, and the ends of the sealing rods 2 are inserted into the monitoring cavity 3. A heat-shrink tubing 4 is fitted over the ends of the two sealing rods 2, and the heat-shrink tubing 4 is filled with a core sample. The device also includes: A sealing ring 5 and a sealing rod 2 have an annular groove 6 on their surfaces. The sealing ring 5 is fitted and fixed inside the annular groove 6 and is located between the heat shrink tubing 4 and the sealing rod 2. Gas delivery channel 7 is opened through the inside of the sealing rod 2. Gas delivery channel 7 is connected to the external gas delivery equipment. A compression chamber 8 is opened at the end of the gas delivery channel 7. Two extrusion blocks 9 are slidably disposed inside the extrusion chamber 8. An air storage space 10 is formed between the opposite sides of the two extrusion blocks 9 and the inner wall of the extrusion chamber 8. The air storage space 10 is connected to the sealing ring 5 through a pipe 11. A first spring 12 is fixed between the extrusion block 9 and the inner wall of the air storage space 10. A first guide surface 13 is provided at the bottom of the extrusion block 9. The pusher is installed in the gas delivery channel 7. Under the action of air pressure, the pusher is used to push the extrusion block 9 to compress the gas storage space 10.

[0031] Specifically, during the displacement adsorption experiment, the heat shrink tubing 4 is first fitted onto the outside of the core sample, and then two sealing rods 2 are inserted into both ends of the heat shrink tubing 4. By heating the heat shrink tubing 4, the heat shrink tubing 4 is tightly connected to the sealing rods 2 and the core sample, forming a whole. This whole is inserted into the shell 1, with the core sample located in the monitoring chamber 3. Subsequently, by filling the monitoring chamber 3 with a confining pressure medium and supplying experimental gas to the sealing rods 2, the gas in the core sample is replaced by the experimental gas, thus completing the displacement adsorption experiment. When the heat shrink tubing 4 is heated unevenly, the sealing effect between the heat shrink tubing 4 and the sealing rod 2 will be reduced. During the subsequent gas introduction process, the gas enters the heat shrink tubing 4, causing the gas pressure inside the heat shrink tubing 4 to increase. As the pressure accumulates, it may locally push up the heat shrink tubing 4 from the sealing interface between the heat shrink tubing 4 and the sealing rod 2, further expanding the gap size and aggravating the degree of gas leakage. This leakage phenomenon will cause the actual gas flow path in the experiment to deviate from the preset design, which will not only cause the measurement of key data such as gas flow rate and pressure to be distorted, but also directly interfere with the accurate judgment of the seepage characteristics or displacement effect of the core sample, ultimately affecting the reliability of the experimental results. Especially when the flow rate of the gas is too large, the impact of the gas on the weak sealing area will be significantly enhanced, and the interference with the experimental results will be further aggravated. The present invention can solve the above problems. The specific working method is as follows: During the process of introducing experimental gas, such as carbon dioxide gas, into the sealing rod 2, the experimental gas flows along the gas delivery channel 7 and pushes the pusher towards the squeezing block 9. Under the guidance of the first guide surface 13, the pusher pushes the squeezing block 9 into the gas storage space 10, and pushes the gas in the gas storage space 10 into the sealing ring 5 through the pipe 11. The sealing ring 5 is made of hollow elastic rubber material. After the gas enters the sealing ring 5, the sealing ring 5 expands, increases the contact pressure between the sealing ring 5 and the heat shrink tubing 4, fills the gap between the sealing rod 2 and the heat shrink tubing 4, thereby improving the sealing effect between the heat shrink tubing 4 and the sealing rod 2 from the inside, thereby avoiding the leakage of experimental gas and ensuring the accuracy of the experimental results.

[0032] As a further embodiment of the present invention, the pusher includes a bracket 14, which is fixed inside the air supply channel 7. A movable rod 15 is slidably connected to the bracket 14. A limiting plate 16 is fixed to one end of the movable rod 15. A second spring 17 is fixed between the limiting plate 16 and the bracket 14. A piston column 18 is fixed to the other end of the movable rod 15. A first push plate 19 is fixed to the end of the piston column 18. The first push plate 19 is disposed in the extrusion chamber 8. An inclined surface is provided on the side of the first push plate 19 near the extrusion block 9. A first connecting groove 20 is provided on the inclined surface. A second connecting groove 21 is provided on the side of the piston column 18 away from the first push plate 19.

[0033] Specifically, during the process of the experimental gas entering the gas delivery channel 7, under the action of gas pressure, the piston column 18 can be pushed to move inside the gas delivery channel 7. The piston column 18 drives the first push plate 19 to move. The inclined surface on the first push plate 19 contacts the first guide surface 13 on the extrusion block 9. Under the guidance of the inclined surface and the first guide surface 13, the extrusion block 9 is pushed to move into the gas storage space 10, thereby completing the pushing function. During the movement of the piston rod 18, the moving rod 15 and the limiting plate 16 will move synchronously. During this process, the limiting plate 16 will compress the second spring 17 to store energy. When the gas supply stops, the limiting plate 16, the moving rod 15 and the piston rod 18 can be pushed to reset under the elastic force of the second spring 17. As the limiting plate 16 gradually approaches the bracket 14, when the support rod at its end contacts the bracket 14, the piston column 18 stops moving due to the obstruction of the bracket 14. At this time, the second connecting groove 21 connects the gas supply channel 7 and the extrusion chamber 8. Gas can enter the extrusion chamber 8 through the second connecting groove 21 and can be discharged from the other end of the first connecting groove 20 and the gas supply channel 7 into the heat shrink tube 4 for subsequent operations of the displacement adsorption experiment.

[0034] As a further embodiment of the present invention, a second push plate 22 is slidably connected inside the extrusion chamber 8. The second push plate 22 has an inclined surface on the side near the extrusion block 9. A second guide surface 23 is provided on the surface of the extrusion block 9. An expansion groove 24 is provided on the side of the second push plate 22 away from the first push plate 19. A through groove 25 is provided on the inner wall of the expansion groove 24. A connecting frame 26 is fixed in the through groove 25. A slide rod 27 is slidably connected to the connecting frame 26. A sealing disc 28 is fixed at one end of the slide rod 27. The sealing disc 28 is embedded in the expansion groove 24. A third spring 29 is fixed between the sealing disc 28 and the connecting frame 26. A guide channel 30 is provided inside the push member. A one-way valve 31 is fixed in the guide channel 30. The one-way valve 31 is used to restrict the movement of the conveying medium from the gas delivery channel 7 into the guide channel 30. A blocking frame 32 is fixed on the inner wall of the guide channel 30.

[0035] Specifically, after the gas passes through the core sample, the displaced gas is discharged from the other end. During the discharge process, it will push the second push plate 22 to move. The inclined surface on the second push plate 22 contacts the second guide surface 23, thereby pushing the extrusion block 9 to move upward. Similarly, the gas in the gas storage space 10 is squeezed by the extrusion block 9, causing the sealing ring 5 to expand and improve the sealing performance, so that both ends of the heat shrink tube 4 can be effectively sealed. During the movement of the second push plate 22, the slide rod 27 moves synchronously. After the slide rod 27 contacts the blocking frame 32, it is blocked by the blocking frame 32 and moves relative to the second push plate 22. This causes the sealing plate 28 to move away from the expansion groove 24, exposing the expansion groove 24 and the through groove 25. The gas can pass through the expansion groove 24 and the through groove 25 and enter the extrusion chamber 8. It then passes through the guide channel 30 and the one-way valve 31 and enters the gas delivery pipe 11 to complete the gas discharge. Furthermore, there is no need to determine the air intake direction of the two sealing rods 2. Regardless of which end the air enters from, the sealing ring 5 can be effectively sealed, ensuring the sealing performance of both ends of the heat shrink tubing 4.

[0036] As a further embodiment of the present invention, a slider 33 is fixed on the inclined surface of the second push plate 22, and a groove 34 is provided on the second guide surface 23, and the slider 33 is slidably connected in the groove 34.

[0037] Specifically, the slider 33 can be a T-shaped block or a dovetail block, and the groove 34 is adapted to the shape of the slider 33. A sealing gasket is provided between the second push plate 22 and the second guide surface 23. Thus, during the sliding process, the second push plate 22 and the extrusion block 9 are tightly connected through the slider 33 and the groove 34, ensuring the sliding sealing performance between the contact surfaces of the second push plate 22 and the extrusion block 9, reducing the possibility of gas entering the extrusion chamber 8 from the gap between the second push plate 22 and the extrusion block 9, and ensuring the stability of the gas pushing performance of the second push plate 22.

[0038] As a further embodiment of the present invention, a pressure sensor is fixed on the inner wall of the gas storage space 10, and a pressure relief chamber 35 is provided on one side of the gas storage space 10. An electric push rod 36 is fixed inside the pressure relief chamber 35, and a piston plate 37 is fixed at the movable end of the electric push rod 36. The piston plate 37 is in sealed contact with the inner wall of the pressure relief chamber 35.

[0039] Specifically, during the heat shrinking process of the heat shrink tubing 4, uneven heat shrinkage results in varying sizes of air leakage gaps between the heat shrink tubing 4 and the sealing rod 2. Different gap sizes require different degrees of expansion of the sealing ring 5, and consequently, different pushing distances of the first pushing plate 19. The first pushing plate 19 must be pushed to its maximum position to ensure complete communication between the air supply channel 7 and the extrusion chamber 8. To ensure that the first pushing plate 19 can move to its final position regardless of the gap size, guaranteeing complete communication between the air supply channel 7 and the extrusion chamber 8, this invention addresses this by incorporating a pressure sensor. The device monitors the air pressure in the air storage space 10 in real time. By comparing the air pressure with a preset value, which is the air pressure after the sealing ring 5 and the heat shrink tubing 4 form a complete seal, the device determines that the seal is complete when the detected air pressure reaches the preset value. At this time, the electric push rod 36 is activated to pull the piston plate 37 to move and retract into the pressure relief chamber 35, thereby connecting the air storage space 10 with the pressure relief chamber 35, increasing the internal space of the air storage space 10, thus providing space for the extrusion block 9 to rise, and ensuring that the first push plate 19 can always move to the final position.

[0040] As a further embodiment of the present invention, a mounting base 38 is fixed on the top surface of the extrusion block 9, a flipping rod 39 is rotatably connected to the mounting base 38, a torsion spring 40 is sleeved on the rotating shaft of the flipping rod 39, one end of the torsion spring 40 is fixed to the flipping rod 39, the other end of the torsion spring 40 is fixed to the mounting base 38, and a roller 41 is rotatably connected to the flipping rod 39 in one direction.

[0041] Specifically, under the elastic force of the torsion spring 40, the flipping rod 39 tends to flip towards the inner wall of the gas storage space 10, thereby making the roller 41 fit tightly against the inner wall of the gas storage space 10. Since the roller 41 and the flipping rod 39 are connected in one direction, the roller 41 rolls against the inner wall of the gas storage space 10 during the process of the extrusion block 9 pushing the gas into the sealing ring 5. When the extrusion block 9 moves in the opposite direction, the roller 41 slides against the gas storage space 10, achieving a damping effect, so that the extrusion block 9 can rise stably and achieve stable expansion of the sealing ring 5.

[0042] As a further embodiment of the present invention, a support plate 42 is fixed on the extrusion block 9, the support plate 42 is in contact with the bottom of the flipping rod 39, a limiting block 43 is fixed on the inner wall of the gas storage space 10, a slope is formed on the bottom surface of the limiting block 43, a groove 44 is formed on the surface of the limiting block 43, the limiting block 43 has a hollow structure, an insertion port 45 is formed at one end of the limiting block 43, two limiting frames 46 are fixed on the inner wall of the insertion port 45, a movable plug 47 is slidably connected in the limiting block 43, the movable plug 47 is located between the two limiting frames 46, one end of the movable plug 47 is fixed to the piston plate 37 through an elastic connecting rod, an exhaust hole 48 communicating with the inside of the limiting block 43 is formed on the surface of the groove 44, and a pushing membrane 49 is fixed on the inner wall of the groove 44.

[0043] Specifically, during the experiment, the transported experimental gas may experience pressure fluctuations, affecting the stability of the extrusion block 9. To address this, a support plate 42 is provided at the bottom of the flipping rod 39 to support it, preventing the roller 41 from contacting the inner wall of the gas storage space 10. When the roller 41 moves to the position of the limiting block 43, it first contacts the inclined surface of the limiting block 43. Guided by the inclined surface, the roller 41 gradually rolls towards the groove 44 until it enters the groove 44 and gets stuck inside. At this point, the locking action between the groove 44 and the roller 41 restricts the downward movement of the flipping rod 39 and the extrusion block 9, thereby ensuring the stability of the extrusion block 9 after completing the gas pushing function, and thus ensuring the continuous sealing performance of the sealing ring 5. In its initial state, the pushing membrane 49 is flush with or protruding from the surface of the limiting block 43. It should be noted that the gap to be filled by the sealing ring 5 is generally small. After the squeezing block 9 moves a short distance, the sealing ring 5 has already reached the maximum gas required for sealing. As can be seen from the above embodiment, at this time, the piston plate 37 needs to be pulled by activating the electric actuator 36 to expand the volume of the gas storage space 10. Therefore, it can be seen that the piston plate 37 has already started moving before the roller 41 contacts the limiting block 43. When the elastic connecting rod and the movable plug 47 are moved, the air pressure inside the limiting block 43 is reduced, thereby adsorbing the pushing membrane 49 to the inner wall of the groove 44. This facilitates the pushing membrane 49 to sink into the groove 44 and form a snap-fit ​​position between the roller 41 and the position of the groove 44, until the movable plug 47 is blocked by the limiting frame 46. At this time, the movable plug 47 stops moving, the piston plate 37 continues to move, and the elastic connecting rod can extend synchronously with the pulling of the piston plate 37. When the experiment is completed and the extrusion block 9 needs to be adjusted to move downward, the piston plate 37 is reset by activating the electric push rod 36. This causes the piston plate 37 to drive the elastic connecting rod and the moving plug 47 to reset, thereby pushing the gas in the limiting block 43 into the groove 44 through the exhaust hole 48. This causes the pushing membrane 49 to bulge again, thereby pushing the roller 41 out of the groove 44 and canceling the jamming effect between the roller 41 and the groove 44. Then, under the push of the first spring 12, the extrusion block 9 can be reset.

[0044] As a further embodiment of the present invention, the elastic connecting rod includes a first connecting rod 50, a fourth spring 51, and a second connecting rod 52. The first connecting rod 50 is fixed to the piston plate 37, the second connecting rod is fixed to the movable plug 47, and the fourth spring 51 is fixed between the first connecting rod 50 and the second connecting rod 52.

[0045] The first connecting rod 50 has a damping groove 53 inside, and a damping rod 54 is inserted into the damping groove 53. The damping rod 54 is made of elastic material.

[0046] Specifically, the damping rod 54 is made of elastic material, and the diameter of the damping rod 54 is slightly larger than the inner diameter of the damping groove 53. Thus, after the damping rod 54 is inserted into the damping groove 53, it can generate a damping effect, and the damping effect is greater than the elastic force of the torsion spring 40. During the movement of the piston plate 37, the piston plate 37 pulls the first connecting rod 50, the fourth spring 51, the second connecting rod 52, and the moving plug 47 to move synchronously until the moving plug 47 is blocked by one of the limiting frames 46. As the piston plate 37 continues to move, the piston plate 37 pulls one end of the first connecting rod 50 and the fourth spring 51 to continue moving, thereby causing the fourth spring 51 to extend. During the resetting process of piston plate 37, piston plate 37 pushes first connecting rod 50 to move. Under the damping action of damping rod 54 and damping groove 53, during the pushing process, first connecting rod 50 can directly push second connecting rod 52 and moving plug 47 to reset through damping rod 54 until moving plug 47 is blocked by another limiting frame 46. As piston plate 37 continues to push, under rigid pushing, damping rod 54 gradually deforms and inserts into damping groove 53, and fourth spring 51 retracts to reset. Thus, during the pushing and resetting process, piston plate 37 can directly push moving plug 47 to move without waiting for fourth spring 51 to retract, avoiding the situation where the gas in gas storage space 10 is difficult to compress, causing piston plate 37 to have difficulty moving.

[0047] As a further embodiment of the present invention, a first friction surface is provided on the side of the pushing membrane 49 away from the exhaust hole 48, and a second friction surface is provided on the surface of the roller 41.

[0048] Specifically, by setting a first friction surface and a second friction surface, the friction between the roller 41 and the groove 44 is further enhanced, thereby further strengthening the snap-fit ​​effect and ensuring the stability of the extrusion block 9.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A saturated carbon dioxide competitive adsorption device, comprising a shell (1), wherein two sealing rods (2) are inserted inside the shell (1), a monitoring cavity (3) is formed in the middle of the shell (1), the ends of the sealing rods (2) are inserted inside the monitoring cavity (3), and the ends of the two sealing rods (2) are fitted with a heat shrink tube (4), the heat shrink tube (4) being filled with a core sample, characterized in that, Also includes: A sealing ring (5) is provided on the surface of the sealing rod (2), and the sealing ring (5) is fitted and fixed in the ring groove (6). The sealing ring (5) is located between the heat shrink tube (4) and the sealing rod (2). Gas delivery channel (7) is provided inside the sealing rod (2). The gas delivery channel (7) is connected to an external gas delivery device. A squeezing chamber (8) is provided at the end of the gas delivery channel (7). Two extrusion blocks (9) are slidably disposed inside the extrusion chamber (8). An air storage space (10) is formed between the opposite sides of the two extrusion blocks (9) and the inner wall of the extrusion chamber (8). The air storage space (10) is connected to the sealing ring (5) through a pipe (11). A first spring (12) is fixed between the extrusion block (9) and the inner wall of the air storage space (10). A first guide surface (13) is provided at the bottom of the extrusion block (9). The pusher is disposed in the gas delivery channel (7). Under the action of air pressure, the pusher is used to push the extrusion block (9) to compress the gas storage space (10).

2. The saturated carbon dioxide competitive adsorption device of claim 1, wherein: The pusher includes a bracket (14), which is fixed inside the gas supply channel (7). A moving rod (15) is slidably connected to the bracket (14). A limit plate (16) is fixed to one end of the moving rod (15). A second spring (17) is fixed between the limit plate (16) and the bracket (14). A piston column (18) is fixed to the other end of the moving rod (15). A first push plate (19) is fixed to the end of the piston column (18). The first push plate (19) is disposed in the extrusion chamber (8). An inclined surface is provided on the side of the first push plate (19) near the extrusion block (9). A first connecting groove (20) is provided on the inclined surface. A second connecting groove (21) is provided on the side of the piston column (18) away from the first push plate (19).

3. A saturated carbon dioxide competitive adsorption device according to claim 2, wherein: The extrusion chamber (8) is slidably connected to a second push plate (22). The second push plate (22) has an inclined surface on the side near the extrusion block (9). The surface of the extrusion block (9) has a second guide surface (23). The surface of the second push plate (22) away from the first push plate (19) has an expansion groove (24). The inner wall of the expansion groove (24) has a through groove (25). A connecting frame (26) is fixed in the through groove (25). A slide rod (2) is slidably connected to the connecting frame (26). 7) A sealing disc (28) is fixed at one end of the slide rod (27). The sealing disc (28) is embedded in the expansion groove (24). A third spring (29) is fixed between the sealing disc (28) and the connecting frame (26). A flow guide channel (30) is opened in the pusher. A one-way valve (31) is fixed in the flow guide channel (30). The one-way valve (31) is used to restrict the transport medium from moving from the gas transmission channel (7) into the flow guide channel (30). A blocking frame (32) is fixed on the inner wall of the flow guide channel (30).

4. The saturated carbon dioxide competitive adsorption device according to claim 3, characterized in that: A slider (33) is fixed on the inclined surface of the second push plate (22), and a groove (34) is provided on the second guide surface (23). The slider (33) is slidably connected in the groove (34).

5. The saturated carbon dioxide competitive adsorption device of claim 1, wherein: A pressure sensor is fixed on the inner wall of the gas storage space (10). A pressure relief chamber (35) is opened on one side of the gas storage space (10). An electric push rod (36) is fixed inside the pressure relief chamber (35). A piston plate (37) is fixed at the movable end of the electric push rod (36). The piston plate (37) is in sealed contact with the inner wall of the pressure relief chamber (35).

6. The saturated carbon dioxide competitive adsorption device according to claim 5, characterized in that: A mounting base (38) is fixed on the top surface of the extrusion block (9). A flipping rod (39) is rotatably connected to the mounting base (38). A torsion spring (40) is sleeved on the rotating shaft of the flipping rod (39). One end of the torsion spring (40) is fixed on the flipping rod (39), and the other end of the torsion spring (40) is fixed on the mounting base (38). A roller (41) is rotatably connected to the flipping rod (39) in one direction.

7. A saturated carbon dioxide competitive adsorption device according to claim 6, wherein: A support plate (42) is fixed on the extrusion block (9). The support plate (42) is in contact with the bottom of the flipping rod (39). A limit block (43) is fixed on the inner wall of the gas storage space (10). A slope is opened on the bottom surface of the limit block (43). A groove (44) is opened on the surface of the limit block (43). The limit block (43) has a hollow structure. An insertion port (45) is opened at one end of the limit block (43). Two limit frames (46) are fixed on the inner wall of the insertion port (45). A movable plug (47) is slidably connected inside the limit block (43). The movable plug (47) is located between the two limit frames (46). One end of the movable plug (47) is fixed to the piston plate (37) through an elastic connecting rod. An exhaust hole (48) communicating with the inside of the limit block (43) is opened on the surface of the groove (44). A pushing membrane (49) is fixed on the inner wall of the groove (44).

8. The saturated carbon dioxide competitive adsorption device according to claim 7, characterized in that: The elastic connecting rod includes a first connecting rod (50), a fourth spring (51), and a second connecting rod (52). The first connecting rod (50) is fixed to the piston plate (37), the second connecting rod is fixed to the movable plug (47), and the fourth spring (51) is fixed between the first connecting rod (50) and the second connecting rod (52).

9. A saturated carbon dioxide competitive adsorption device according to claim 8, characterized in that: The first connecting rod (50) has a damping groove (53) inside, and a damping rod (54) is inserted in the damping groove (53). The damping rod (54) is made of elastic material.

10. A saturated carbon dioxide competitive adsorption device according to claim 7, characterized in that: The pushing diaphragm (49) has a first friction surface on the side away from the exhaust hole (48), and the roller (41) has a second friction surface on its surface.

Images