Deep-sea animal in-situ capture pressure-maintaining sampling device and control method thereof

Abstract

The invention provides a deep-sea animal in-situ capture pressure-maintaining sampling device and a control method thereof, the deep-sea animal in-situ capture pressure-maintaining sampling device mainly comprises a sampler and a pressure compensator, and the sampler is connected with the pressure compensator through a fluid pipeline. Wherein the sampler is provided with opposite biological capturing openings, and a capturing opening sealing cover is arranged on the inner side of each biological capturing opening and can do reciprocating motion. A liquid inlet is formed outside the pressure compensator, and a pressure maintaining liquid cabin and a pressure balancing cabin are further arranged inside the pressure compensator; and the pressure maintaining liquid cabin is connected with the pressure balancing cabin and the liquid inlet respectively. The device is simple in structure and low in cost, through combined use of the sampler and the pressure compensator, automatic pressure compensation and pressure maintaining work can be conducted after deep-sea organisms are captured, rapid and continuous capturing activities can be achieved through the oppositely-arranged organism capturing openings, and the overall task execution efficiency and the stability of the storage environment after the organisms are captured are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of marine scientific research equipment, and in particular relates to a deep-sea animal in-situ capture pressure-maintaining sampling device and a control method thereof. Background Art

[0002] The deep sea, as one of the least explored areas on Earth, is rich in biological resources, and research on it has great scientific significance and value.

[0003] The deep sea environment is unique, with extreme conditions such as high pressure, low temperature, and darkness, which have given birth to biological communities that are adapted to these special environments. Studying deep-sea marine life helps us gain a deeper understanding of the origin, evolution, and adaptive mechanisms of life, and provides important inspiration for the development of life sciences.

[0004] However, the extreme environmental characteristics of the deep sea also lead to many technical problems in deep-sea marine life research, among which biological capture and in-situ pressure-maintaining technology are one of the key issues.

[0005] On the one hand, there is biological capture: special capture equipment needs to be designed to accurately capture target organisms in a high-pressure, low-temperature, and dark environment while avoiding damage to the organisms;

[0006] The other aspect is in-situ pressure maintenance: in order to keep deep-sea organisms in their original environmental pressure, it is necessary to develop efficient in-situ pressure maintenance technology to ensure that the pressure of the organisms does not change significantly during the transfer process.

[0007] In the prior art, the general method used is to carry a remote-controlled robot / mechanical arm on a submersible, combined with a special capture tool (such as a negative pressure mechanism and an open-and-close biological capture box) to perform biological capture work, which can accurately capture the target organisms under ideal circumstances. Although this method is relatively direct, easy to initially design, and correspondingly processed and produced, its structure is complex, costly, and has many supporting equipment, which occupies the already tight internal space of the submersible and is prone to mechanical failures; the operation requirements are high, and once a capture fails, the interval between the second capture is long, and the low density of deep-sea organisms leads to a long capture cycle, resulting in a high overall cost. Furthermore, in order to achieve in-situ pressure maintenance, the existing equipment also has a separately designed pressure maintenance container, and the organisms in the capture tool need to be transferred to the pressure maintenance container under the capture environment, which not only increases the complexity and cost of the equipment again, but also reduces the stability of use and work efficiency; and the existing technology rarely involves the compensation problem of pressure fluctuations during the pressure maintenance process, that is, when the submersible is diving and surfacing, the external pressure and temperature changes lead to changes in the structural size of the pressure-resistant cabin, which leads to changes in the pressure inside the pressure chamber for deep-sea animals. If this problem is ignored, it will cause stress in the organisms, and then cause sudden death, resulting in mission failure.

[0008] In summary, it is also necessary to design a device with a simple structure, low cost, and the ability to efficiently capture deep-sea organisms in situ and automatically maintain pressure compensation, so as to improve the success rate of deep-sea animal capture and work efficiency, and reduce overall costs. Summary of the invention

[0009] In view of the problems existing in the prior art, the present invention provides a deep-sea animal in-situ capture and pressure-maintaining sampling device, which solves the above problems by improving the structural design.

[0010] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0011] On the one hand, the present invention provides a deep-sea animal in-situ capture pressure-maintaining sampling device, which mainly includes a sampler and a pressure compensator; the sampler is connected to the pressure compensator through a fluid pipeline;

[0012] The sampler is a tank structure with opposing biological capture ports at both ends; a capture port sealing cover is provided on the inner side of each biological capture port, and a reciprocating motion mechanism is provided between the capture port sealing cover and the tank structure of the sampler; the motion direction of the reciprocating motion mechanism is perpendicular to the plane where the biological capture port is located;

[0013] The outer shell of the pressure compensator is a tank structure with sealed ends and provided with at least one liquid inlet; the interior of the pressure compensator is provided with a pressure-maintaining liquid tank and a piston-type pressure balance tank;

[0014] The pressure balance chamber is provided with a sample pressure chamber, a pressure regulating valve and a regulating piston; the sample pressure chamber is connected with the interior of the sampler through the fluid pipeline, and the regulating piston is provided at one end of the sample pressure chamber, and the regulating piston moves with the pressure change of the sample pressure chamber; the regulating piston is linked with the valve core of the pressure regulating valve;

[0015] The pressure-maintaining liquid tank is connected to the pressure balance tank and the liquid inlet respectively; when the pressure regulating valve is in an open state, the pressure-maintaining liquid tank is communicated with the sample pressure chamber.

[0016] Furthermore, the biological capture port is an opening structure with an inner cone surface;

[0017] The capture port sealing cover is a plug structure with an outer cone surface.

[0018] Furthermore, the capture port sealing cover is made of magnetic material;

[0019] The reciprocating motion mechanism includes an elastic reset mechanism and an electromagnet;

[0020] One end of the elastic reset mechanism is fixedly connected to the housing of the sampler, and the other end is connected to or in contact with the sealing cover of the capture port;

[0021] The electromagnet is fixed in the sampler.

[0022] Furthermore, the capture port sealing cover is made of non-magnetic metal; a magnet mounting groove is provided at the tail of the capture port sealing cover, and a permanent magnet is fixed in the magnet mounting groove;

[0023] The reciprocating motion mechanism includes an elastic reset mechanism and an electromagnet;

[0024] One end of the elastic reset mechanism is fixedly connected to the housing of the sampler, and the other end is connected to or in contact with the sealing cover of the capture port;

[0025] The electromagnet is fixed in the sampler.

[0026] Furthermore, a contact sealing structure is provided between the organism capture port and the capture port sealing cover.

[0027] Furthermore, the pressure balance chamber has a two-section splicing structure, including two sample pressure chambers, namely a first sample pressure chamber and a second sample pressure chamber;

[0028] Each of the sample pressure chambers is connected to the interior of the sampler via a fluid pipeline;

[0029] A three-way connection block is also provided in the middle of the pressure balance chamber, and an adjusting piston is slidably installed between the three-way connection block and the first and second sample pressure chambers; pressure sensing chambers are respectively provided between the three-way connection block and the adjusting pistons on both sides;

[0030] There are two pressure regulating valves located at the two ends of the pressure balance chamber, namely, a pressure-maintaining chamber cone valve and a regulating chamber cone valve; the regulating piston is fixedly connected to the valve core of the pressure regulating valve on the same side;

[0031] When the cone valve of the pressure-maintaining chamber is opened, the first sample pressure chamber is connected to the pressure-maintaining liquid chamber; when the cone valve of the regulating chamber is opened, the second sample pressure chamber is connected to the interior of the pressure compensator;

[0032] The pressure compensator is also provided with an environmental pressure chamber, and the environmental pressure chamber is connected to the two pressure sensing chambers respectively through the flow path of the three-way connecting block.

[0033] Furthermore, the liquid inlet includes a first liquid inlet and a second liquid inlet;

[0034] The first liquid inlet is equipped with a first ball valve, and the second liquid inlet is equipped with a second ball valve;

[0035] The first liquid inlet is connected to the pressure-maintaining liquid chamber, and the second liquid inlet is connected to the ambient pressure chamber.

[0036] On the other hand, the present invention also provides a control method for the above-mentioned deep-sea animal in-situ capture pressure-maintaining sampling device, which comprises the following steps:

[0037] S1. Before diving, install the deep-sea animal in-situ capture and pressure-maintaining sampling device on the submersible and turn on the switches of each flow path;

[0038] S2. Pre-pressurize the sampler and pressure compensator according to task requirements, and close the switches of each flow path after reaching the preset pressure value;

[0039] S3, the submersible performs a diving mission, and when reaching the operating depth, chooses to stay in a preset area, and performs deep-sea bottom organism capture work by controlling the opening and closing of the organism capture port;

[0040] S4. When the submersible returns or continues to dive, the pressure compensator continues to adjust the pressure of the sampler until the sampling is completed.

[0041] Furthermore, in the deep seabed organism capture operation, the opposing organism capture ports move in the same direction and have different switch states;

[0042] When the deep-sea bottom organism capture work is completed, all the organism capture ports are closed.

[0043] Furthermore, the liquid inlet includes a first liquid inlet and a second liquid inlet;

[0044] Before the diving operation, the pressure is pre-charged through the first liquid inlet, and the second liquid inlet is closed;

[0045] When the operating depth is reached, the second liquid inlet is opened to perform in-situ pressure regulation, and the second liquid inlet is closed after the deep-sea bottom organism capture work is completed.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The present invention has a simple structure and low cost. Through the combined use of the sampler and the pressure compensator, it can perform automatic pressure compensation and pressure maintenance work after the deep-sea organisms are captured, and the oppositely arranged organism capture ports can realize rapid and continuous capture activities, thereby improving the efficiency of the overall task execution and the stability of the storage environment after the organisms are captured. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A three-dimensional diagram of a device in a specific embodiment of the present invention;

[0049] Figure 2 It is a schematic diagram of the internal structure of the pressure compensator in a specific embodiment of the present invention;

[0050] Figure 3 It is a cross-sectional view of a device in a specific embodiment of the present invention;

[0051] Figure 4 It is a flow chart of the method in a specific embodiment of the present invention.

[0052] In the figure: 1. sampler, 2. pressure compensator, 101. biological capture port, 102. capture port sealing cover, 103. watertight connector, 104. electromagnet, 105. spring seat, 106. spring, 107. O-ring, 201. sealing end cover, 202. pressure balance chamber, 203. first ball valve, 204. pressure-maintaining liquid chamber, 205. high-pressure seawater chamber, 206. three-way connecting block, 207. in-situ seawater chamber, 208. environmental pressure chamber, 209. second sample pressure chamber, 210. regulating chamber cone valve core, 211. regulating chamber cone valve, 212. second ball valve, 213. pressure sensing chamber, 214. regulating piston, 215. first sample pressure chamber, 216. pressure-maintaining chamber cone valve, 217. pressure-maintaining chamber cone valve core, 218. end cover sealing ring. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0055] In the description of the present invention, it is necessary to understand that the relative relationships indicated by the terms "upper", "lower", "lateral", etc. are based on the upper and lower relationships corresponding to the device when it is installed in an actual application. They are for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, and therefore cannot be understood as a limitation on the present invention.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] It should be noted that the methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products unless otherwise specified.

[0058] This embodiment provides a deep-sea animal in-situ capture pressure-maintaining sampling device, such as Figure 1 As shown, it mainly includes a sampler 1 and a pressure compensator 2. The sampler 1 is connected to the pressure compensator 2 through a fluid pipeline and is fixed to the sampling basket or the end of the mechanical arm of the submersible.

[0059] Combination Figure 3 As shown, the sampler 1 of this embodiment is a horizontally arranged tank structure, and opposite biological capture ports 101 are provided at both ends. Optionally, taking the two biological capture ports 101 as an example, they are both opening structures with inner conical surfaces, and the end face of the sampler 1 and the shell are designed to be an integrated structure, thereby increasing the overall pressure bearing capacity of the sampler 1 and reducing the risk of pressure relief. Correspondingly, a capture port sealing cover 102 is provided on the inner side of each biological capture port 101, which is a plug structure with an outer conical surface, and can be conically sealed with the biological capture port 101, thereby improving its sealing performance, especially in the floating stage, the internal pressure is greater than the external pressure, which can make the conical surface fit more closely and improve the sealing performance. Furthermore, in order to achieve effective sealing in the in-situ capture stage, an annular groove is also processed on the outer conical surface of the capture port sealing cover 102, and an O-ring 107 is installed, thereby increasing the in-situ sealing performance through a contact sealing structure.

[0060] A reciprocating motion mechanism is also provided between the capture port sealing cover 102 and the tank structure of the sampler 1. The capture port sealing cover 102 of this embodiment is made of magnetic material, and the reciprocating motion mechanism includes an elastic reset mechanism and an electromagnet. Figure 3As shown, when each capture port sealing cover 102 is in the sealing position, an electromagnet 104 is installed at a certain distance from the tail, which is fixedly connected to the housing of the sampler 1 through a fixed bracket. The elastic reset mechanism includes a spring 106 and a spring clamp 105. An annular spring clamp 105 is provided at the tail of each capture port sealing cover 102, and the capture port sealing cover 102 is slidably connected to the spring clamp 105. The spring clamp 105 is fixedly connected to the housing of the sampler 1, and the spring 106 is set at the tail of the capture port sealing cover 102, one end of the spring 106 is fixedly connected to the spring clamp 105, and the other end of the spring 106 is in contact with the outer edge of the plug cap of the capture port sealing cover 102. Under a certain pre-pressure condition of the spring 106, the spring 106 can push the capture port sealing cover 102 to seal, and the capture port sealing cover 102 is sucked back after the electromagnet 104 is energized, thereby completing the opening and closing work of the capture port sealing cover 102. Therefore, the opening and closing working direction, that is, the movement direction of the capture port sealing cover 102 is perpendicular to the plane where the organism capture port 101 is located.

[0061] Optionally, the power of the electromagnet 104 is provided by a cable, so in this embodiment, a watertight connector 103 is installed on the top of the sampler 1 for connecting the cable of the submersible, and the electromagnet 104 is connected internally through the cable to enable the submersible to control the on and off operation of the electromagnet 104.

[0062] In another embodiment, there is also a better design mode, that is, the material of the capture port sealing cover 102 is replaced with a non-magnetic metal material, such as copper. The capture port sealing cover 102 is also an outer cone plug structure, but a concave cylindrical magnet mounting groove is provided at its tail, and a permanent magnet is fixed in the magnet mounting groove. The purpose of this design is to cope with the situation of increased external pressure. When the submersible continues to dive for other tasks, there will be a situation where the external pressure is greater than the internal pressure of the sampler 1, and only relying on the spring for sealing, the applicable depth variation range is small, especially when the electromagnet power is greatly limited. Therefore, by adding a permanent magnet design, the electromagnet 104 can be reversely energized in the required scenario, thereby applying an outward thrust to the capture port sealing cover 102, plus the thrust of the spring 106, it can adapt to a wider range of depth increases (the increase in diving pressure compared to the capture position pressure), and can maintain good sealing performance, especially the copper material has good deformation ability, and can also improve the performance of the cone surface seal.

[0063] like Figure 2 and Figure 3As shown, the shell of the pressure compensator 2 is a can structure with sealed ends, which includes a cylindrical hollow tube body and sealed end covers 201 at both ends, which are sealed and connected by bolts, and an end cover sealing ring 218 is arranged between the sealed end cover 201 and the hollow tube body. The two sealed end covers 201 of the pressure compensator 2 are respectively provided with a liquid inlet, i.e., a first liquid inlet and a second liquid inlet, and a first ball valve 203 is installed at the first liquid inlet, and a second ball valve 212 is installed at the second liquid inlet.

[0064] The pressure compensator 2 is provided with a pressure-maintaining liquid tank 204 and a piston-type pressure balance tank 202 inside. Optionally, the pressure balance tank 202 of this embodiment is a two-stage splicing structure, which is spliced ​​by two columnar tank bodies, a three-way connecting block 206 is provided in the middle, and a T-shaped flow path is provided inside. An adjusting piston 214 is installed on both sides of the three-way connecting block 206, and the empty area between the three-way connecting block 206 and the adjusting piston 214 is a pressure sensing chamber 213, so that the two pressure sensing chambers 213 are connected to each other. The adjusting piston 214 can slide in the chamber of the pressure balance tank 202. Pressure regulating valves are installed at both ends of the pressure balance tank 202, namely, a pressure-maintaining chamber cone valve 216 and a regulating chamber cone valve 211. A first sample pressure chamber 215 is provided between the pressure-maintaining chamber cone valve 216 and the regulating piston 214 on the left, and the first sample pressure chamber 215 is connected to the internal cavity of the sampler 1 through a separate fluid pipeline. A second sample pressure chamber 209 is provided between the regulating chamber cone valve 211 and the regulating piston 214, and the second sample pressure chamber 209 is also connected to the internal chamber of the sampler 1 through a separate fluid pipeline. Both regulating pistons 214 are fixedly connected to the valve core of the pressure regulating valve on the same side through a connecting rod, and the pressure-maintaining chamber cone valve valve core 217 and the regulating chamber cone valve valve core 210 have the same opening and closing direction, that is, when the regulating piston 214 slides to the left, the valve core is opened, and when it moves to the right, the valve core is closed.

[0065] When the pressure-maintaining chamber cone valve 216 is opened, the first sample pressure chamber 215 is connected to the pressure-maintaining liquid chamber 204 ; when the regulating chamber cone valve 211 is opened, the second sample pressure chamber 209 is connected to the interior of the pressure compensator 2 .

[0066] The pressure-maintaining liquid tank 204 is a liquid storage pressure bottle, and the interior thereof is a high-pressure seawater chamber 205 , which is connected to the pressure balance tank 202 and the first liquid inlet through pipelines.

[0067] The pressure compensator 2 is also provided with an environmental pressure chamber 208, which is also a liquid storage pressure bottle, and has an in-situ seawater chamber 207 inside, which is connected to the two pressure sensing chambers 213 through the flow path of the three-way connecting block 206, and is connected to the second liquid inlet through a pipeline.

[0068] like Figure 4As shown, this embodiment further provides a control method for a deep-sea animal in-situ capture pressure-maintaining sampling device based on the above embodiment, which comprises the following steps:

[0069] S1. Before diving, install the deep-sea animal in-situ capture and pressure-maintaining sampling device on the ROV sampling basket or mechanical arm of the submersible, and turn on the switches of each flow path to connect the cabin that needs to be adjusted;

[0070] S2. Calculate the pressure at the operating depth according to the task requirements, then open the first ball valve to pre-charge the pressure compensator's pressure-maintaining liquid tank, that is, fill it with high-pressure seawater to reach a preset pressure value (consistent with the pressure at the intended operating depth), and then close the first ball valve;

[0071] S3, the submersible performs a diving mission, and when it reaches the operating depth, it chooses to stay in the preset area and opens the second ball valve through the manipulator;

[0072] The deep-sea bottom organisms are captured by controlling the opening and closing of the organism capture ports; optionally, in the deep-sea bottom organism capture work, the opposing organism capture ports move in the same direction and have different switch states; specifically, the two opposing organism capture ports of this embodiment can be captured in a closed and opened manner during the capture process, and when the target organism is found, one side of the closed organism capture port is brought close to the target organism, and after a suitable distance, the organism capture port is opened, and the organism capture port on the opposite side is closed at the same time, so as to be sucked in by negative pressure; if the capture fails, the posture of the sampler is quickly changed, and the closed organism capture port on the other side is moved to the vicinity of the target organism to start the second capture; such a design can realize continuous and rapid capture, and the negative pressure suction method simulating the swallowing of organisms does not require support from a separate negative pressure device, and in the subsequent closing process, the diversion characteristics of the cone surface will also keep the pressure in the sampler moderate, and the backflow from the closing process can also keep the target organism in the sampler;

[0073] After the capture is completed, the electromagnet is powered off or reversely powered through the watertight connector, so that the two biological capture ports are closed synchronously;

[0074] Close the second ball valve by the manipulator;

[0075] S4. When the submersible returns or continues to dive, the pressure compensator continues to adjust the pressure of the sampler until the sampling is completed;

[0076] Among them, according to the requirements of subsequent tasks, the adjustment process of the pressure compensator is divided into two types, including:

[0077] S41. When the submersible surfaced and returned to the deck;

[0078] S411. At this time, due to the decrease in external pressure, the sampler will deform axially and radially under the action of internal pressure, which will inevitably cause volume fluctuations in the cylinder and reduce pressure.

[0079] S412. Since the pressure in the environmental pressure chamber and the pressure sensing chamber is the operating environment pressure and the pressure remains unchanged under the action of the shell (pressure isolation tank) of the pressure compensator, the left and right regulating pistons in the pressure balance chamber move to the left and right sides respectively;

[0080] S413, the left regulating piston moves to the left and at the same time, the cone valve of the pressure-maintaining chamber is pushed to open through the connecting rod, and the high-pressure seawater in the pressure-maintaining liquid tank flows into the first sample pressure chamber through the cone valve to the sampler, completing the pressure compensation. This process continues until the pressure in the sampler is balanced with the pressure in the ambient pressure chamber;

[0081] S42, when the submersible continues to dive deeper;

[0082] S421. At this time, due to the increase in external pressure, the bio-fidelity cylinder will be compressed axially and radially under the action of external pressure, which will inevitably cause volume fluctuations in the cylinder and increase pressure;

[0083] S422. Since the pressure in the environmental pressure chamber and the pressure sensing chamber is the operating environment pressure and the pressure remains unchanged under the action of the shell (pressure isolation tank) of the pressure compensator, the left and right regulating pistons in the pressure balance chamber move toward the three-way connecting block respectively;

[0084] S423. The right regulating piston moves to the left and pulls the regulating chamber cone valve to open through the connecting rod. The high-pressure seawater in the sampler flows into the second sample pressure chamber through the regulating chamber cone valve to the pressure compensator, completing the sampler pressure relief. This process continues until the pressure in the sampler is balanced with the pressure in the ambient pressure chamber.

[0085] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A deep-sea animal in-situ capture and pressure-maintaining sampling device, characterized in that: It includes a sampler and a pressure compensator; the sampler is connected to the pressure compensator through a fluid pipeline; The sampler is a tank structure with opposing biological capture ports at both ends; a capture port sealing cover is provided on the inner side of each biological capture port, and a reciprocating motion mechanism is provided between the capture port sealing cover and the tank structure of the sampler; the motion direction of the reciprocating motion mechanism is perpendicular to the plane where the biological capture port is located; The shell of the pressure compensator is a tank structure with sealed ends and provided with at least one liquid inlet; the interior of the pressure compensator is provided with a pressure-maintaining liquid tank and a piston-type pressure balance tank; The pressure balance chamber is provided with a sample pressure chamber, a pressure regulating valve and a regulating piston; the sample pressure chamber is connected with the interior of the sampler through the fluid pipeline, and the regulating piston is provided at one end of the sample pressure chamber, and the regulating piston moves with the pressure change of the sample pressure chamber; the regulating piston is linked with the valve core of the pressure regulating valve; The pressure-maintaining liquid tank is connected to the pressure balance tank and the liquid inlet respectively; when the pressure regulating valve is in an open state, the pressure-maintaining liquid tank is communicated with the sample pressure chamber.

2. The deep-sea animal in-situ capture and pressure-maintaining sampling device according to claim 1, characterized in that: The biological capture port is an opening structure with an inner cone surface; The capture port sealing cover is a plug structure with an outer cone surface.

3. The deep-sea animal in-situ capture and pressure-maintaining sampling device according to claim 1 or 2, characterized in that: The capture port sealing cover is made of magnetic material; The reciprocating motion mechanism includes an elastic reset mechanism and an electromagnet; One end of the elastic reset mechanism is fixedly connected to the housing of the sampler, and the other end is connected to or in contact with the sealing cover of the capture port; The electromagnet is fixed in the sampler.

4. The deep-sea animal in-situ capture and pressure-maintaining sampling device according to claim 1 or 2, characterized in that: The capture port sealing cover is made of non-magnetic metal; a magnet mounting groove is provided at the tail of the capture port sealing cover, and a permanent magnet is fixed in the magnet mounting groove; The reciprocating motion mechanism includes an elastic reset mechanism and an electromagnet; One end of the elastic reset mechanism is fixedly connected to the housing of the sampler, and the other end is connected to or in contact with the sealing cover of the capture port; The electromagnet is fixed in the sampler.

5. The deep-sea animal in-situ capture and pressure-maintaining sampling device according to claim 1, characterized in that: A contact sealing structure is provided between the biological capture port and the capture port sealing cover.

6. The deep-sea animal in-situ capture and pressure-maintaining sampling device according to claim 1, characterized in that: The pressure balance chamber has a two-section splicing structure, including two sample pressure chambers, namely a first sample pressure chamber and a second sample pressure chamber; Each of the sample pressure chambers is connected to the interior of the sampler via a fluid pipeline; A three-way connection block is also provided in the middle of the pressure balance chamber, and an adjusting piston is slidably installed between the three-way connection block and the first and second sample pressure chambers; pressure sensing chambers are respectively provided between the three-way connection block and the adjusting pistons on both sides; There are two pressure regulating valves located at the two ends of the pressure balance chamber, namely, a pressure-maintaining chamber cone valve and a regulating chamber cone valve; the regulating piston is fixedly connected to the valve core of the pressure regulating valve on the same side; When the cone valve of the pressure-maintaining chamber is opened, the first sample pressure chamber is connected to the pressure-maintaining liquid chamber; when the cone valve of the regulating chamber is opened, the second sample pressure chamber is connected to the interior of the pressure compensator; The pressure compensator is also provided with an environmental pressure chamber, and the environmental pressure chamber is connected to the two pressure sensing chambers respectively through the flow path of the three-way connecting block.

7. The deep-sea animal in-situ capture and pressure-maintaining sampling device according to claim 6, characterized in that: The liquid inlet comprises a first liquid inlet and a second liquid inlet; The first liquid inlet is equipped with a first ball valve, and the second liquid inlet is equipped with a second ball valve; The first liquid inlet is connected to the pressure-maintaining liquid chamber, and the second liquid inlet is connected to the ambient pressure chamber.

8. A control method for a deep-sea animal in-situ capture pressure-maintaining sampling device, characterized in that: The steps include: S1. Before diving, install the deep-sea animal in-situ capture and pressure-maintaining sampling device on the submersible and turn on the switches of each flow path; S2. Pre-pressurize the sampler and pressure compensator according to task requirements, and close the switches of each flow path after reaching the preset pressure value; S3, the submersible performs a diving mission, and when reaching the operating depth, chooses to stay in a preset area, and performs deep-sea bottom organism capture work by controlling the opening and closing of the organism capture port; S4. When the submersible returns or continues to dive, the pressure compensator continues to adjust the pressure of the sampler until the sampling is completed.

9. The control method of the deep-sea animal in-situ capture pressure-maintaining sampling device according to claim 8, characterized in that: In the deep-sea bottom organism capture work, the opposing organism capture ports move in the same direction and have different switch states; When the deep-sea bottom organism capture work is completed, all the organism capture ports are closed.

10. The control method of the deep-sea animal in-situ capture pressure-maintaining sampling device according to claim 8, characterized in that: The liquid inlet includes a first liquid inlet and a second liquid inlet; Before the diving operation, the pressure is pre-charged through the first liquid inlet, and the second liquid inlet is closed; When the operating depth is reached, the second liquid inlet is opened to perform in-situ pressure regulation, and the second liquid inlet is closed after the deep-sea bottom organism capture work is completed.

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