Ultrahigh-pressure sealing performance experimental platform for pressure-maintaining sampler and use method of ultrahigh-pressure sealing performance experimental platform

Abstract

The invention discloses an ultrahigh-pressure sealing performance experiment platform for a full-sea-depth sediment pressure-maintaining sampler and a use method, and belongs to the technical field of full-sea-depth sediment pressure-maintaining sampling. The experimental platform comprises a hyperbaric cabin system, an oil cylinder action system, an experimental rack and a sampling system, the experimental platform utilizes an electric pressure pump to pressurize a hyperbaric cabin barrel until the experimental pressure is reached, a plurality of pressure pumps are utilized to realize the sampling action and valve closing action of a sampler, and a high-pressure valve of the electric pressure pump is operated to relieve the pressure of the hyperbaric cabin barrel. Therefore, the whole process of pressure-maintaining sampling operation of the sediment pressure-maintaining sampler is simulated, and finally, the sealing pressure-maintaining performance of the sampler is verified by measuring the pressure in the pressure-maintaining cylinder. According to the application, the sealing performance of the sampler can be directly verified or the pressure maintaining structure can be improved, so that the deep sea experiment cost is saved to the maximum extent, the experiment safety is effectively improved, and an important experiment technical means is provided for scientific research of deep sea environment, deep geochemistry, life process and the like.

Description

Technical Field

[0001] This application belongs to the technical field of full-depth sea sediment pressure-retaining sampling, and specifically relates to an ultra-high pressure sealing performance experimental platform for a full-depth sea sediment pressure-retaining sampler and a usage method thereof. Background Technique

[0002] Deep-sea sediments often contain extremely rich geochemical information, and the chemical components and distribution laws therein are important material bases for studying geochemistry and geological structures in sediments. At the same time, submarine sediments are also recorders of the marine geological history evolution, recording important paleoclimate and paleoenvironment information, which can be used for a series of scientific research such as inversion of the land-sea advance and retreat history, speculation of ocean circulation patterns, and evolution of life processes. However, due to the existence of the deep-sea high-pressure water layer, obtaining samples of these deep-sea sediments under pressure completely depends on advanced submarine sediment collection methods and technical equipment. Among them, sediment sampling equipment is one of the important ways to obtain sediments.

[0003] At present, marine powers such as the United States, Germany, Japan, Australia, and China have made major breakthroughs in submarine technology, and have successively developed deep-sea sediment pressure-retaining samplers, providing important conditions for research in geochemistry, life science, etc. However, at the present stage, the pressure-retaining rate of domestic submarine sediment samplers is often not high, and examples of low or failed pressure-retaining rates of sampling due to the sealing failure of the sealing structure of the sampling equipment are common in sea trials. For example, Peoples et al. proposed a carried pressure-retaining sampler and conducted sea trial tests on it (depth 10970 m), the measured pressure was 90 MPa, and the pressure loss was 21 MPa. Pettigrew et al. used the proposed hydraulically driven and rope-extracted pressure-retaining sampler for sea trials. During multiple dives, the pressure loss caused by sealing and expansion was as high as 20 MPa. Up to now, only a few sampling equipments can obtain pressure-retaining sediment samples, and the pressure loss caused by sealing is significantly high. In the process of developing and utilizing deep-sea biological resources, deep-sea high-pressure sealing is an important basis for breaking through the deep-sea high-pressure barrier to obtain pressure-retaining sediments. The environmental characteristics such as ultra-high pressure and low temperature of deep-sea equipment determine the harsh requirements for combined seals of deep-sea sediment samplers. However, there are few literature reports on experimental equipment for directly testing the sealing performance of samplers at present, especially the research on experimental platforms under ultra-high pressure is almost blank.

[0004] Therefore, it is particularly important to innovate an ultra-high pressure sealing performance experimental platform to verify the design of the sealing structure, which will save the deep-sea experimental cost to the greatest extent and effectively improve experimental safety, provide high-quality sea-bottom pressure-retaining samples for scientific research such as the life evolution of deep-sea microbial communities, and provide technical means for scientific research such as deep-abyss sea-bottom environment, deep-abyss geochemical processes, and life processes. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide an ultra-high pressure sealing performance experimental platform and a usage method for a full-depth seabed sediment pressure-retaining sampler. By verifying the sealing performance of the sampler or improving the pressure-retaining structure, it can save the deep-sea experimental cost to the greatest extent and effectively improve the experimental safety, providing an important experimental technical means for scientific research such as the abyssal seabed environment, abyssal geochemistry, and life processes, thereby solving at least one of the technical problems involved in the background art.

[0006] To solve the above technical problems, the present application is implemented as follows: The embodiments of the present application provide an ultra-high pressure sealing performance experimental platform for a full-depth seabed sediment pressure-retaining sampler, including a high-pressure chamber system, an oil cylinder action system, an experimental bench, and a sampling system, where: The high-pressure chamber system includes a high-pressure chamber cylinder body, a high-pressure chamber cylinder cover, and an electric pressure pump. The high-pressure chamber cylinder body is a hollow cylinder with one end sealed and the other end open. The high-pressure chamber cylinder cover is configured at the open end of the high-pressure chamber cylinder body. The electric pressure pump is connected to the internal space of the high-pressure chamber cylinder body through a first high-pressure pipeline to adjust the pressure inside the high-pressure chamber cylinder body; The oil cylinder action system includes a sampling action oil cylinder, a closing action oil cylinder, a first pressurizing system, a second pressurizing system, and a third pressurizing system. The first pressurizing system includes a first pressure pump connected to the upper pressurizing inlet of the sampling action oil cylinder through a second high-pressure pipeline. The second pressurizing system includes a second pressure pump connected to the lower pressurizing inlet of the sampling action oil cylinder through a third high-pressure pipeline. The third pressurizing system includes a third pressure pump connected to the upper pressurizing inlet of the closing action oil cylinder through a fourth high-pressure pipeline. The lower pressurizing inlet of the closing action oil cylinder is sealed; The experimental bench is arranged inside the high-pressure chamber cylinder body, and both the sampling action oil cylinder and the closing action oil cylinder are fixedly arranged on the experimental bench; The sampling system includes a pressure-retaining cylinder, a sampler assembly, a locking mechanism, and a pressure-retaining mechanism. The pressure-retaining cylinder is a hollow cylinder with one end sealed and the other end open. One end of the sampler assembly is fixedly arranged on the sampling action piston of the sampling action oil cylinder, and the other end is matched with the open end of the pressure-retaining cylinder; the locking mechanism is configured at the open end of the pressure-retaining cylinder and is used to lock the sampler assembly; the pressure-retaining mechanism is connected to the internal space of the pressure-retaining cylinder to adjust the pressure inside the pressure-retaining cylinder.

[0007] Optionally, the high-pressure chamber system further includes a first high-pressure valve, a second high-pressure valve, a first pressure gauge, and a second pressure gauge respectively disposed on the first high-pressure pipeline. The first high-pressure valve and the second high-pressure valve are respectively disposed at the inlet and outlet of the electric pressure pump, and the first pressure gauge and the second pressure gauge are located between the second high-pressure valve and the high-pressure chamber cylinder body.

[0008] Optionally, the high-pressure chamber system further includes an external retaining mechanism for fixedly securing the high-pressure chamber cover to the open end of the high-pressure chamber cylinder body.

[0009] Optionally, the first pressurization system further includes a first pressure relief valve, a first oil tank, a first branch pipeline, and a third high-pressure valve and a third pressure gauge respectively disposed on the second high-pressure pipeline. The third high-pressure valve is disposed at the outlet of the first pressure pump, and the third pressure gauge is located between the third high-pressure valve and the high-pressure chamber cylinder body; one end of the first branch pipeline is connected to the first oil tank, and the other end is connected to the second high-pressure pipeline and is located between the third high-pressure valve and the third pressure gauge. The first pressure relief valve is disposed on the first branch pipeline.

[0010] Optionally, the second pressurization system includes a second pressure relief valve, a second oil tank, a second branch pipeline, and a fourth high-pressure valve and a fourth pressure gauge respectively disposed on the third high-pressure pipeline. The fourth high-pressure valve is disposed at the outlet of the second pressure pump, and the fourth pressure gauge is located between the fourth high-pressure valve and the high-pressure chamber cylinder body; one end of the second branch pipeline is connected to the second oil tank, and the other end is connected to the third high-pressure pipeline and is located between the fourth high-pressure valve and the fourth pressure gauge. The second pressure relief valve is disposed on the second branch pipeline.

[0011] Optionally, the third pressurization system includes a third pressure relief valve, a third oil tank, a third branch pipeline, and a fifth high-pressure valve and a fifth pressure gauge respectively disposed on the fourth high-pressure pipeline. The fifth high-pressure valve is disposed at the outlet of the third pressure pump, and the fifth pressure gauge is located between the fifth high-pressure valve and the high-pressure chamber cylinder body; one end of the third branch pipeline is connected to the third oil tank, and the other end is connected to the fourth high-pressure pipeline and is located between the fifth high-pressure valve and the fifth pressure gauge. The third pressure relief valve is disposed on the third branch pipeline.

[0012] Optionally, the test bench includes a support rod and three working plates sequentially arranged on the support rod from top to bottom. The sampling action oil cylinder and the closing working oil cylinder are respectively disposed on the upper working plate, the sampling system is disposed on the middle working plate, and the lower working plate is seated at the bottom of the internal space of the high-pressure chamber cylinder body.

[0013] Optionally, the locking mechanism includes a locking block, a reset key, a reset guide rod, and a reset spring. The locking block is movable to lock the sampler assembly. The reset key is used to press and connect to the locking block through the reset guide rod. The reset spring is sleeved on the reset guide rod to provide elastic force for the reset key, and the locking block is driven to move by pressing the reset key.

[0014] Optionally, the pressure maintaining mechanism includes a pressure maintaining cylinder with a hollow interior, a pressure maintaining piston disposed in the pressure maintaining cylinder, an inflation valve connected to the lower pressure inlet of the pressure maintaining cylinder, and a drain valve connected to the upper liquid discharge port of the pressure maintaining cylinder. The drain valve is also connected to the liquid discharge port of the pressure maintaining cylinder.

[0015] Optionally, the piston rod of the closing action oil cylinder is connected to the drain valve of the pressure maintaining cylinder through a flexible rope.

[0016] The embodiment of the present application also provides a method for using the ultra-high pressure sealing performance experimental platform of the full-depth sediment pressure-maintaining sampler, including: Fix the sampling system on the experimental bench. Place the sampler assembly at an appropriate position above the pressure maintaining cylinder. Operate the second pressure pump to ensure that the sampling action piston is at the upper top position. By operating the third pressure pump, ensure that the closing action piston is at the lower end position and the drain valve is in the open state; Operate the first pressure pump to lower the sampling action piston to press down the sampler assembly until the locking mechanism completes the action. Operate the third pressure pump to raise the closing action piston until the drain valve is closed; After confirming that the pipelines are connected properly, use the truss crane to slowly lift the sampling system together with the experimental bench into the high-pressure chamber cylinder body. Seal the high-pressure chamber cylinder cover. Inject clear water into the high-pressure chamber cylinder body. After ensuring that there is no leakage in the seal, prepare for pressurization; Operate the electric pressure pump to pressurize until the readings of the first pressure gauge and the second pressure gauge are slightly greater than the experimental pressure. Connect the power supply of the high-pressure chamber system and slowly pressurize until the experimental pressure is reached, and maintain the pressure for 5 minutes; Operate the first pressure pump to pressurize. As the pressure increases, the reading of the third pressure gauge will swing to the left, indicating that the sampling action piston is moving downward. When the reading of the third pressure gauge continues to increase, it indicates that the sampling action piston has moved down to the end of the first oil cylinder body, and keep this pressure constant; Operate the first pressure pump to relieve pressure. Operate the second pressure pump to pressurize. At this time, the sampling action piston will move upward to the topmost position, and the locking mechanism will lock the sampler assembly; Operate the second pressure pump to slowly relieve pressure. At this time, the closing action piston connected to the drain valve will move upward under the action of the hydrostatic pressure difference in the high-pressure chamber cylinder body, thereby closing the drain valve, and the sampling system is sealed; Operate the sixth cone sealing structure of the high-pressure chamber system to slowly depressurize, and keep the depressurization time basically consistent with the actual recovery time of the sampling system; After depressurization, open the high-pressure chamber cylinder body, lift out the experimental bench to the designated position, and check whether the appearance and surface of each component are damaged; Measure the pressure in the pressure-holding cylinder and record the pressure indication.

[0017] This application has the following beneficial effects compared with the prior art: simple, reliable, and high safety in operation; by improving the sealing and pressure-holding structure of the sampler, the deep-sea experiment cost can be saved to the greatest extent and the experimental safety can be effectively improved; it provides an important experimental technical means for scientific research such as the abyssal seabed environment, abyssal geochemistry, and life processes. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, where: Figure 1 It is a top view structural schematic diagram of the ultra-high pressure sealing performance experiment platform of the full-depth sediment pressure-holding sampler provided by the embodiment of this application; Figure 2 For the sectional view along Figure 1 the C-C line in Figure 3 For the sectional view along Figure 1 the D-D line in Figure 4 It is a structural schematic diagram of the first cone sealing structure provided by the embodiment of this application; Figure 5 It is a structural schematic diagram of the sampling action oil cylinder provided by the embodiment of this application; Figure 6 It is a structural schematic diagram of the closing action oil cylinder provided by the embodiment of this application; Figure 7 It is a structural schematic diagram of the experimental bench provided by the embodiment of this application; Figure 8 It is a structural schematic diagram of the sampling system provided by the embodiment of this application. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0020] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0021] Please refer to Figures 1 to 8 As shown, the present application provides an ultra-high pressure sealing performance experimental platform for a full-depth sediment pressure-retaining sampler, including a high-pressure chamber system, an oil cylinder action system, an experimental bench 3, and a sampling system 4. Specifically, the high-pressure chamber system includes a high-pressure chamber cylinder body 11, a high-pressure chamber cylinder cover 12, an external holding mechanism, and an electric pressure pump 13. The high-pressure chamber cylinder body 11 is a hollow cylinder with one end sealed and the other end open. The high-pressure chamber cylinder cover 12 is disposed at the open end of the high-pressure chamber cylinder body 11, and the external holding mechanism fixes the high-pressure chamber cylinder cover 12 to the open end of the high-pressure chamber cylinder body 11.

[0022] In a specific embodiment, in combination with Figure 3 As shown, the external holding mechanism includes a holding main body 14, bolts 15, and nuts 16. The holding main body 14 is sleeved outside the high-pressure chamber cylinder body 11 and the high-pressure chamber cylinder cover 12, and the bolts 15 are threadedly engaged with the nuts 16 to fix the holding main body 14 to the high-pressure chamber cylinder body 11 and the high-pressure chamber cylinder cover 12 respectively.

[0023] To improve the sealing performance, a first sealing ring 17 is provided between the holding main body 14 and the high-pressure chamber cylinder body 11. A plurality of second sealing rings 18 are provided between the high-pressure chamber cylinder cover 12 and the high-pressure chamber cylinder body 11.

[0024] The electric pressure pump 13 communicates with the internal space of the high-pressure chamber cylinder body 11 through a first high-pressure pipeline 10 to adjust the pressure inside the high-pressure chamber cylinder body 11.

[0025] It should be noted that one end of the first high-pressure pipeline 10 connected to the inside of the high-pressure chamber cylinder body 11 is provided with a first tapered sealing structure 19 for sealing.

[0026] In a specific embodiment, in combination with Figure 4 As shown, the first tapered sealing structure 19 includes a steel ball 191 and a safety cap 192 that cooperates with the steel ball 191. The safety cap 192 is used to fix the first high-pressure pipeline 10 to the high-pressure chamber cylinder body 11.

[0027] The high-pressure chamber system 1 further includes a first high-pressure valve 101, a second high-pressure valve 102, a first pressure gauge 103, and a second pressure gauge 104 respectively arranged on the first high-pressure pipeline 10. The first high-pressure valve 101 and the second high-pressure valve 102 are respectively arranged at the inlet and outlet of the electric pressure pump 13. The first pressure gauge 103 and the second pressure gauge 104 are located between the second high-pressure valve 102 and the high-pressure chamber cylinder body 11 for monitoring high pressure.

[0028] The oil cylinder action system includes a sampling action oil cylinder 21, a closing action oil cylinder 22, a first pressurization system 23, a second pressurization system 24, and a third pressurization system 25.

[0029] In combination with Figure 5 As shown, the sampling action oil cylinder 21 includes a first oil cylinder body 210, a sampling action piston 211 disposed within the first oil cylinder body 210 and dividing the internal cavity of the first oil cylinder body 210 into an upper cavity and a lower cavity, and a plurality of third sealing rings 212 disposed between the first oil cylinder body 210 and the sampling action piston 211.

[0030] In combination with Figure 6 As shown, the closing action oil cylinder 22 includes a second oil cylinder body 220, a closing action piston 221 disposed within the second oil cylinder body 220 and dividing the internal cavity of the second oil cylinder body 220 into an upper cavity and a lower cavity, and a plurality of fourth sealing rings 222 disposed between the second oil cylinder body 220 and the closing action piston 221.

[0031] The first pressurization system 23 includes a first pressure pump 231 that communicates with the upper pressurization inlet of the sampling action oil cylinder 21 through a second high-pressure pipeline 230. The upper pressurization inlet of the sampling action oil cylinder 21 communicates with the upper cavity of the first oil cylinder body 210. One end of the second high-pressure pipeline 230 connected to the sampling action oil cylinder 21 is provided with a second tapered sealing structure 232, and the structure of the second tapered sealing structure 19 is the same as that of the first tapered sealing structure 19.

[0032] The first pressurization system 23 further includes a first pressure relief valve 233, a first oil tank 234, a first branch pipeline 235, and a third high-pressure valve 236 and a third pressure gauge 237 respectively disposed on the second high-pressure pipeline 230.

[0033] The third high-pressure valve 236 is disposed at the outlet of the first pressurization pump 231, and the third pressure gauge 237 is located between the third high-pressure valve 236 and the high-pressure chamber cylinder body 11; one end of the first branch pipeline 235 is connected to the first oil tank 234, and the other end is connected to the second high-pressure pipeline 230 and is located between the third high-pressure valve 236 and the third pressure gauge 237, and the first pressure relief valve 233 is disposed on the first branch pipeline 235.

[0034] The second pressurization system 24 includes a second pressurization pump 241 that is communicated with the lower pressurization inlet of the sampling action oil cylinder 21 through a third high-pressure pipeline 240. The lower pressurization inlet of the sampling action oil cylinder 21 is communicated with the lower cavity of the first oil cylinder body 210.

[0035] One end of the third high-pressure pipeline 240 connected to the sampling action oil cylinder 21 is provided with a third tapered seal structure 242, and the third tapered seal structure 242 has the same structure as the first tapered seal structure 19.

[0036] The second pressurization system 24 includes a second pressure relief valve 243, a second oil tank 244, a second branch pipeline 245, and a fourth high-pressure valve 246 and a fourth pressure gauge 247 respectively disposed on the third high-pressure pipeline 240. The fourth high-pressure valve 246 is disposed at the outlet of the second pressurization pump 241, and the fourth pressure gauge 247 is located between the fourth high-pressure valve 246 and the high-pressure chamber cylinder body 11.

[0037] One end of the second branch pipeline 245 is connected to the second oil tank 244, and the other end is connected to the third high-pressure pipeline 240 and is located between the fourth high-pressure valve 246 and the fourth pressure gauge 247, and the second pressure relief valve 243 is disposed on the second branch pipeline 245.

[0038] The third pressurization system 25 includes a third pressurization pump 251 that is communicated with the upper pressurization inlet of the closing action oil cylinder 22 through a fourth high-pressure pipeline 250. The upper pressurization inlet of the closing action oil cylinder 22 is communicated with the upper cavity of the second oil cylinder body 220.

[0039] One end of the fourth high-pressure pipeline 250 connected to the closing action oil cylinder 22 is provided with a fourth tapered seal structure 252, and the fourth tapered seal structure 252 has the same structure as the first tapered seal structure 19.

[0040] One end of the fourth high-pressure pipeline 250 passes through the through holes 121 evenly distributed circumferentially on the high-pressure chamber cylinder cover 12 and communicates with the upper chamber of the valve-closing action oil cylinder 22.

[0041] The lower pressure inlet of the closing action oil cylinder 21 is sealed, and the lower pressure inlet of the closing action oil cylinder 22 communicates with the lower chamber of the second oil cylinder body 220. Specifically, it is sealed by a fifth conical sealing structure 211, and the fifth conical sealing structure 211 has the same structure as the first conical sealing structure 19.

[0042] The third pressurization system 25 includes a third pressure relief valve 253, a third oil tank 254, a third branch pipeline 255, and a fifth high-pressure valve 256 and a fifth pressure gauge 257 respectively arranged on the fourth high-pressure pipeline 250. The fifth high-pressure valve 256 is arranged at the outlet of the third pressurization pump 251, and the fifth pressure gauge 257 is located between the fifth high-pressure valve 256 and the high-pressure chamber cylinder body 11.

[0043] One end of the third branch pipeline 255 is connected to the third oil tank 254, and the other end is connected to the fourth high-pressure pipeline 250 and is located between the fifth high-pressure valve 256 and the fifth pressure gauge 257. The third pressure relief valve 253 is arranged on the third branch pipeline 255.

[0044] It should be noted that in this application, the above-mentioned multiple high-pressure pipelines are all fixedly connected to the high-pressure chamber cylinder cover 12 by the same structure as the first conical sealing structure 19, which will not be repeated here.

[0045] The test bench 3 is arranged inside the high-pressure chamber cylinder body 11, and the sampling action oil cylinder 21 and the closing action oil cylinder 22 are both fixedly arranged on the test bench.

[0046] Combined Figure 7 As shown, the test bench 3 includes a support rod 31, a positioning nut 32, and three working disks 33 arranged on the support rod 31 in sequence from top to bottom. The positioning nut 32 is screwed on the support rod 31 to support and position the working disks 33.

[0047] In a specific embodiment, the number of the support rods 31 is three, and the bottoms of the three support rods 31 are welded and fixed to the lower working disk 33.

[0048] The sampling action oil cylinder 21 and the closing working oil cylinder 22 are respectively arranged on the upper working disk 33, the sampling system is arranged on the middle working disk 33, and the lower working disk 33 is seated on the bottom of the internal space of the high-pressure chamber cylinder body 11.

[0049] Combined Figure 8As shown, the sampling system 4 includes a pressure-holding cylinder 41, a sampler assembly 42, a locking mechanism 43, and a pressure-holding mechanism 44. The pressure-holding cylinder 41 is a hollow cylinder with one end sealed and the other end open. One end of the sampler assembly 42 is fixedly installed on the sampling piston 211 of the sampling action oil cylinder 21, and the other end is fitted with the open end of the pressure-holding cylinder 41.

[0050] A step portion 410 is further provided at the open end of the pressure-holding cylinder 41. An inclined surface (not labeled) is provided at the bottom of the sampler assembly 42. A seal 412 that cooperates with the inclined surface and a support spring 413 disposed at the bottom of the seal 412 are provided on the step portion 410.

[0051] In fact, sealing rings (not labeled) can be provided between the seal 412 and the inclined surface of the sampler assembly 42, and between the seal 412 and the pressure-holding cylinder 41 for sealing.

[0052] The locking mechanism 43 is arranged at the open end of the pressure-holding cylinder 41 and is used to lock the sampler assembly 42.

[0053] The locking mechanism 43 includes a locking block 431, a reset key 432, a reset guide rod 433, and a reset spring 434. The locking block 431 is movable to lock the sampler assembly 42. The reset key 432 is used to press and connect the locking block 431 through the reset guide rod 433. The reset spring 434 is sleeved on the reset guide rod 433 to provide elastic force for the reset key 432. By pressing the reset key 432, the locking block 431 is driven to move.

[0054] The pressure-holding mechanism 44 is communicated with the internal space of the pressure-holding cylinder 41 to adjust the pressure inside the pressure-holding cylinder 41.

[0055] The pressure-holding mechanism 44 includes a pressure-holding cylinder 441 with a hollow interior, a pressure-holding piston 442 disposed inside the pressure-holding cylinder 441, an inflation valve 443 connected to the lower pressurization inlet of the pressure-holding cylinder 441, and a drain valve 444 connected to the upper drain port of the pressure-holding cylinder 441. The drain valve 444 is also connected to the drain port of the pressure-holding cylinder 41.

[0056] The pressure-holding piston 442 divides the internal cavity of the pressure-holding cylinder 441 into an upper cavity and a lower cavity. The upper drain port of the pressure-holding cylinder 441 is communicated with the upper cavity of the pressure-holding cylinder 441, and the lower pressurization inlet of the pressure-holding cylinder 441 is communicated with the lower cavity of the pressure-holding cylinder 441.

[0057] The closing piston 221 of the closing action oil cylinder 22 is connected to the drain valve 411 of the pressure-holding cylinder 41 through a flexible rope 5.

[0058] In a specific embodiment, a section of spring 51 is further provided in the middle of the flexible rope 5, so as to play a buffering role when the closing action piston 221 moves upward.

[0059] A floating ball 52 located inside the high-pressure cabin cylinder body 11 is also tied to the flexible rope 5.

[0060] A pressure relief hole 120 for pressure relief is provided through the high-pressure cabin cylinder cover 12, and a sixth conical sealing structure 121 for sealing is provided at the pressure relief hole 120, and the structure of the sixth conical sealing structure 121 is the same as that of the first conical sealing structure 19.

[0061] The present application also provides a method for using an ultra-high pressure sealing performance experimental platform for a full-depth sediment pressure-maintaining sampler, and the specific operation steps are as follows: After fixing the sampling system 4 to the experimental bench 3, it is then placed inside the high-pressure cabin cylinder body 11 for a pressurization experiment. The pressure is increased to the experimental pressure (115 MPa), and then the sampling action oil cylinder 21 is used to push the sampler assembly 42 to perform a simulated sampling action until the sampler assembly 42 completes locking and sealing. After maintaining the pressure for the specified time, the pressure is relieved, the sampling system 4 is taken out, and it is checked whether the sampling system 4 is damaged or deformed, and the sample pressure inside the pressure-maintaining cylinder 41 is measured. The specific experimental steps are as follows: The low-pressure inlet of the booster pump is firmly connected to the compressed air cylinder and the nitrogen cylinder, and the high-pressure outlet is firmly connected to the inflation valve 443. The handle of the booster pump system is operated, and a certain pressure of nitrogen is pre-charged into the pressure-maintaining cylinder 441 via the inflation valve 443. After the inflation is completed, the inflation valve 443 is closed.

[0062] Run for trial. The specific operation is as follows: Fix the sampling system 4 on the experimental bench 3, place the sampler assembly 42 at an appropriate position above the pressure-maintaining cylinder 41, operate the second pressure pump 241 to ensure that the sampling action piston 211 is at the upper top position, and by operating the third pressure pump 251, ensure that the closing action piston 221 is at the lower end position and the drain valve 411 is in the open state. Then, operate the first pressure pump 231 to move the sampling action piston 211 downward to press the sampler assembly 42 until the locking mechanism 43 completes the action, and operate the third pressure pump 251 to move the closing action piston 221 upward until the drain valve 443 is closed; After confirming that the pipeline is connected properly, use the truss crane to slowly lift the sampling system 4 together with the experimental bench 3 into the high-pressure cabin cylinder body 11, seal the high-pressure cabin cylinder cover 12, inject clear water into the high-pressure cabin cylinder body 11, and after ensuring that there is no leakage in the seal, prepare for pressurization; Operate the electric pressure pump 13 to pressurize until the readings of the first pressure gauge 103 and the second pressure gauge 104 are slightly greater than the experimental pressure, connect the power supply of the high-pressure cabin system, and slowly pressurize until the experimental pressure, and maintain the pressure for 5 minutes; Operate the first pressure pump 231 to increase the pressure. As the pressure increases, the reading of the third pressure gauge 237 will swing to the left, indicating that the sampling action piston 211 is moving downward. When the reading of the third pressure gauge 237 continues to increase, it indicates that the sampling action piston 211 has moved down to the lower end of the first oil cylinder block 210, and keep this pressure constant; Operate the first pressure pump 231 to relieve pressure, and operate the second pressure pump 241 to increase the pressure. At this time, the sampling action piston 211 will move upward to the top position, and the locking mechanism 43 will lock the sampler assembly 42; Operate the second pressure pump 241 to slowly relieve pressure. At this time, the closing action piston 221 connected to the drain valve 411 will move upward under the action of the hydrostatic pressure difference in the high-pressure cabin cylinder 11, thereby closing the drain valve 411, and the sampling system is sealed; Operate the sixth conical sealing structure 121 of the high-pressure cabin system to slowly relieve pressure, and the pressure relief time is basically the same as the actual recovery time of the sampling system 4; After the pressure relief is completed, open the high-pressure cabin cylinder 11, lift the test bench 3 out to the designated position, and check whether the appearance and surface of each component are damaged; Measure the pressure in the pressure-holding cylinder 41. The specific measurement process is as follows: a. After checking and ensuring that the manual pressure pump functions normally, tightly connect the connecting pipe (inner diameter 0.5 mm, length about 1.5 m) to the pressure interface; b. Operate the pressure handle until the water flows evenly out of the other end of the connecting pipe, and then tightly connect the connecting pipe to the squeezing valve on the sampler assembly 42; c. Operate the pressure pump handle to pressurize the connecting pipeline to the test pressure, hold the pressure for 1 minute, observe the reading of the pressure gauge, and ensure that there is no obvious pressure drop. If there is a change in the reading, it means that the connecting pipe and the squeezing valve are not tightly connected and need to be tightened again; d. After confirming that the reading of the pressure gauge is stable, slowly open the squeezing valve and record the reading of the pressure gauge.

[0063] The above sampling system 4 is simple and fast to use, can add more data on temperature difference and operating water depth range, and can also update the corresponding theoretical data according to different design parameters of the sampling system, so as to meet the sampling operation requirements under different temperature difference ranges and different seabed depth conditions. By accurately calculating the theoretical value of the pressure-holding rate of the sample, the nitrogen piston type compensation device can maximize its compensation performance in full-depth sampling and efficiently meet the demand for pressure-holding samples in full-depth scientific investigations.

[0064] This application has the following beneficial effects compared with the prior art: simple, reliable and safe to operate; by improving the sealing and pressure-holding structure of the sampler, the deep-sea experimental cost is saved to the greatest extent and the experimental safety is effectively improved; it provides an important experimental technical means for scientific research such as the abyssal seabed environment, abyssal geochemistry and life processes.

[0065] It should be noted that, in this document, the terms "including", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the presence of additional identical elements in the process, method, article or device that includes such element.

[0066] In addition, it should be pointed out that the scope of the methods and systems in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0067] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the spirit of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. An ultra-high pressure sealing performance experimental platform for a full-depth sediment pressure-retaining sampler, characterized in that, It includes a high-pressure chamber system, an oil cylinder action system, a test bench, and a sampling system, where: The high-pressure chamber system includes a high-pressure chamber cylinder body, a high-pressure chamber cylinder cover, and an electric pressure pump. The high-pressure chamber cylinder body is a hollow cylinder with one end sealed and the other end open. The high-pressure chamber cylinder cover is configured at the open end of the high-pressure chamber cylinder body. The electric pressure pump is connected to the internal space of the high-pressure chamber cylinder body through a first high-pressure pipeline to adjust the pressure inside the high-pressure chamber cylinder body; The oil cylinder action system includes a sampling action oil cylinder, a closing action oil cylinder, a first pressurization system, a second pressurization system, and a third pressurization system. The first pressurization system includes a first pressure pump connected to the upper pressurization inlet of the sampling action oil cylinder through a second high-pressure pipeline. The second pressurization system includes a second pressure pump connected to the lower pressurization inlet of the sampling action oil cylinder through a third high-pressure pipeline. The third pressurization system includes a third pressure pump connected to the upper pressurization inlet of the closing action oil cylinder through a fourth high-pressure pipeline. The lower pressurization inlet of the closing action oil cylinder is sealed; The test bench is arranged inside the high-pressure chamber cylinder body, and both the sampling action oil cylinder and the closing action oil cylinder are fixedly arranged on the test bench; The sampling system includes a pressure-holding cylinder, a sampler assembly, a locking mechanism, and a pressure-holding mechanism. The pressure-holding cylinder is a hollow cylinder with one end sealed and the other end open. One end of the sampler assembly is fixedly arranged on the sampling action piston of the sampling action oil cylinder, and the other end is matched with the open end of the pressure-holding cylinder. The locking mechanism is configured at the open end of the pressure-holding cylinder and is used to lock the sampler assembly. The pressure-holding mechanism is connected to the internal space of the pressure-holding cylinder to adjust the pressure inside the pressure-holding cylinder.

2. The ultra-high pressure sealing performance experimental platform for the full-depth sediment pressure-maintaining sampler according to claim 1, wherein The high-pressure chamber system further includes a first high-pressure valve, a second high-pressure valve, a first pressure gauge, and a second pressure gauge respectively arranged on the first high-pressure pipeline. The first high-pressure valve and the second high-pressure valve are respectively arranged at the inlet and outlet of the electric pressure pump. The first pressure gauge and the second pressure gauge are located between the second high-pressure valve and the high-pressure chamber cylinder body.

3. The ultra-high pressure sealing performance experimental platform for the full-depth sediment pressure-maintaining sampler according to claim 1 or 2, characterized in that The high-pressure chamber system further includes an external holding mechanism for fixedly arranging the high-pressure chamber cylinder cover at the open end of the high-pressure chamber cylinder body.

4. The ultra-high pressure sealing performance experimental platform for the full-depth sediment pressure-retaining sampler according to claim 2, characterized in that, The first pressurization system further includes a first pressure relief valve, a first oil tank, a first branch pipeline, and a third high-pressure valve and a third pressure gauge respectively arranged on the second high-pressure pipeline. The third high-pressure valve is arranged at the outlet of the first pressure pump. The third pressure gauge is located between the third high-pressure valve and the high-pressure chamber cylinder body. One end of the first branch pipeline is connected to the first oil tank, and the other end is connected to the second high-pressure pipeline and is located between the third high-pressure valve and the third pressure gauge. The first pressure relief valve is arranged on the first branch pipeline.

5. The ultra-high pressure sealing performance experimental platform for the full-depth sediment pressure-retaining sampler according to claim 2, characterized in that, The second pressurization system includes a second pressure relief valve, a second oil tank, a second branch pipeline, and a fourth high-pressure valve and a fourth pressure gauge respectively arranged on the third high-pressure pipeline. The fourth high-pressure valve is arranged at the outlet of the second pressurization pump, and the fourth pressure gauge is located between the fourth high-pressure valve and the high-pressure chamber cylinder body; one end of the second branch pipeline is connected to the second oil tank, and the other end is connected to the third high-pressure pipeline and is located between the fourth high-pressure valve and the fourth pressure gauge. The second pressure relief valve is arranged on the second branch pipeline.

6. The ultra-high pressure sealing performance experimental platform for the full-depth sediment pressure-retaining sampler according to claim 2, characterized in that, The third pressurization system includes a third pressure relief valve, a third oil tank, a third branch pipeline, and a fifth high-pressure valve and a fifth pressure gauge respectively arranged on the fourth high-pressure pipeline. The fifth high-pressure valve is arranged at the outlet of the third pressurization pump, and the fifth pressure gauge is located between the fifth high-pressure valve and the high-pressure chamber cylinder body; one end of the third branch pipeline is connected to the third oil tank, and the other end is connected to the fourth high-pressure pipeline and is located between the fifth high-pressure valve and the fifth pressure gauge. The third pressure relief valve is arranged on the third branch pipeline.

7. The ultra-high pressure sealing performance experimental platform for the full-depth sediment pressure-retaining sampler according to claim 1, characterized in that, The test bench includes a support rod and three working disks sequentially arranged on the support rod from top to bottom. The sampling action oil cylinder and the closing working oil cylinder are respectively arranged on the upper working disk. The sampling system is arranged on the middle working disk, and the lower working disk is seated on the bottom of the internal space of the high-pressure chamber cylinder body.

8. The ultra-high pressure sealing performance experimental platform for the full-depth sediment pressure-retaining sampler according to claim 1 or 7, characterized in that, The locking mechanism includes a locking block, a reset key, a reset guide rod, and a reset spring. The locking block is movable for locking the sampler assembly. The reset key is used for pressing and is connected to the locking block through the reset guide rod. The reset spring is sleeved on the reset guide rod to provide elastic force for the reset key, and the locking block is driven to move by pressing the reset key.

9. The ultra-high pressure sealing performance experimental platform for the full-depth sediment pressure-retaining sampler according to claim 8, characterized in that The pressure maintaining mechanism includes a pressure maintaining cylinder with a hollow interior, a pressure maintaining piston arranged in the pressure maintaining cylinder, an inflation valve connected to the lower pressure inlet of the pressure maintaining cylinder, and a drain valve connected to the upper liquid discharge port of the pressure maintaining cylinder. The drain valve is also connected to the liquid discharge port of the pressure maintaining cylinder.

10. A method for using an ultra-high pressure sealing performance experimental platform of a full-depth sediment pressure-retaining sampler as described in any one of claims 1-9, characterized in that, Including: Fix the sampling system on the test bench, place the sampler assembly at an appropriate position above the pressure maintaining cylinder. Operate the second pressurization pump to ensure that the sampling action piston is at the upper top position. By operating the third pressurization pump, ensure that the closing action piston is at the lower end position and the drain valve is in the open state; Operate the first pressurization pump to lower the sampling action piston to press down the sampler assembly until the locking mechanism action is completed. Operate the third pressurization pump to raise the closing action piston until the drain valve is closed; After confirming that the pipelines are connected properly, use the truss crane to slowly lift the sampling system together with the test bench into the high-pressure chamber cylinder body. Seal the high-pressure chamber cylinder cover, inject clear water into the high-pressure chamber cylinder body. After ensuring no leakage in the seal, prepare for pressurization; Operate the electric pressurization pump to pressurize until the readings of the first pressure gauge and the second pressure gauge are slightly greater than the test pressure. Connect the power supply of the high-pressure chamber system and slowly pressurize until the test pressure is reached, and maintain the pressure for 5 minutes; Operate the first pressure pump to pressurize. As the pressure increases, the reading of the third pressure gauge will swing to the left, indicating that the sampling action piston is moving downward. When the reading of the third pressure gauge continues to increase, it means that the sampling action piston has moved down to the end of the first oil cylinder block, and keep this pressure constant; Operate the first pressure pump to depressurize, and operate the second pressure pump to pressurize. At this time, the sampling action piston will move upward to the top position, and the locking mechanism will lock the sampler assembly; Operate the second pressure pump to slowly depressurize. At this time, the closing action piston connected to the drain valve will move upward under the action of the hydrostatic pressure difference in the high-pressure chamber cylinder body, thereby closing the drain valve, and the sampling system is sealed; Operate the sixth conical sealing structure of the high-pressure chamber system to slowly depressurize, and the depressurization time is basically the same as the actual recovery time of the sampling system; After depressurization is completed, open the high-pressure chamber cylinder body, lift the test bench to the designated position, and check whether the appearance and surface of each component are damaged; Measure the pressure in the pressure holding cylinder and record the reading of the pressure gauge.

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