Ocean temperature difference energy buoyancy adjusting device facing seabed mooring heaving mobile node

Abstract

The invention discloses an ocean temperature difference energy buoyancy adjusting device facing a seabed mooring heaving mobile node, and belongs to the technical field of ocean engineering, the ocean temperature difference energy buoyancy adjusting device comprises a buoyancy adjusting hydraulic unit, an outer oil bag pipe arranged around the buoyancy adjusting hydraulic unit and a heat exchange pipe; the buoyancy adjusting hydraulic unit comprises an oil storage oil way, a solidification oil way, an energy release oil way, an energy storage oil way and a pressurization gas way. The oil storage path injects hydraulic oil in the outer oil bag pipe into the inner oil bag; the solidification oil way injects hydraulic oil in the inner oil bag into the heat exchange pipe. The energy releasing oil way injects high-pressure oil in the energy accumulator into the outer oil bag pipe. The energy storage oil way injects hydraulic oil in the heat exchange pipe into the energy accumulator. And the pressurizing gas path drives oil in the oil storage path and the solidification oil path to flow by adjusting gas pressure in the gas chamber. The ocean temperature difference energy large-capacity buoyancy adjusting device has multiple advantages in the aspects of structure optimization, energy innovation, system compatibility, operation reliability and the like, and the performance and practicability of a seabed anchoring system heaving mobile node can be remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ocean engineering, and particularly relates to an ocean thermal energy buoyancy adjustment device for a subsea mooring heaving and moving node. Background Art

[0002] A subsea mooring heaving and moving node is an underwater device that can autonomously move in seawater along the vertical direction, and realizes heaving motion by adjusting its own buoyancy state. In practical applications, the node can actively change its buoyancy in water through an internal buoyancy control system (such as a variable buoyancy chamber, a ballast adjustment mechanism, etc.), so as to drive the node to move up and down, and is widely applicable to ocean engineering fields such as ocean observation, underwater communication, and relay deployment.

[0003] At present, there are still many defects and deficiencies in the technical implementation and practical application of subsea mooring heaving and moving nodes, mainly reflected in aspects such as the energy system, operation efficiency, reliability, and maintenance cost. First of all, existing nodes generally rely on electric energy as the power source for buoyancy adjustment, and usually have batteries installed inside to drive the ballast adjustment device or variable buoyancy chamber to realize heaving motion. However, due to limited underwater space, limited battery energy density, and extremely difficult battery replacement or charging in the deep-sea environment, the self-sustaining time of the node is short, and it is difficult to meet the requirements of long-term and continuous ocean observation or operation. Secondly, in order to extend the endurance time, the node must be frequently recovered for battery replacement or charging, which not only greatly increases the operation and maintenance cost of the system, but also affects its actual deployment ability in the open ocean or extreme environments. In addition, the rapid consumption of battery power may also cause the node to lose power midway, unable to return to the designated position or complete the task, thus affecting the integrity and continuity of the observation data. Generally speaking, there are bottlenecks in the energy supply mode of current subsea mooring heaving and moving nodes, which limit their operation efficiency and engineering adaptability, and there is an urgent need to improve them through new energy utilization methods or efficient energy management strategies. Summary of the Invention

[0004] Aiming at the problems in the prior art that the subsea mooring heaving and moving node relies on electric energy to drive buoyancy, has limited energy, short self-sustaining time, frequent maintenance, and high operation cost, the present invention provides an ocean thermal energy buoyancy adjustment device for a subsea mooring heaving and moving node.

[0005] The present invention is implemented as follows. An ocean thermal energy buoyancy adjustment device for a subsea mooring heaving and moving node, characterized in that it includes a buoyancy adjustment hydraulic unit, an outer oil bladder tube and a heat exchange tube arranged around the buoyancy adjustment hydraulic unit; the buoyancy adjustment hydraulic unit includes an oil storage oil circuit, a solidification oil circuit, an energy release oil circuit, an energy storage oil circuit and a pressurized gas circuit; the oil storage oil circuit is configured to inject hydraulic oil in the outer oil bladder tube into the inner oil bladder; the solidification oil circuit is configured to inject hydraulic oil in the inner oil bladder into the heat exchange tube; the energy release oil circuit is configured to inject high-pressure oil in the accumulator into the outer oil bladder tube; the energy storage oil circuit is configured to inject hydraulic oil in the heat exchange tube into the accumulator; the pressurized gas circuit is configured to drive the flow of oil in the oil storage oil circuit and the solidification oil circuit by adjusting the air pressure in the air chamber; the heat exchange tube is internally provided with a phase change material, and the volume change of the phase change material caused by the change of seawater temperature drives the circulation of hydraulic oil between the energy storage oil circuit and the solidification oil circuit to achieve buoyancy adjustment.

[0006] In the above technical solution, preferably, the oil storage oil circuit is composed of a hydraulic steel pipe sequentially connected to the outer oil bladder tube, a flange adapter, a bottom end cover, an oil storage solenoid valve, an oil storage check valve and an oil tank lower housing; the oil storage check valve is configured to prevent the hydraulic oil in the inner oil bladder from flowing back into the outer oil bladder tube.

[0007] In the above technical solution, preferably, the solidification oil circuit is composed of a hydraulic steel pipe sequentially connected to the oil tank lower housing, a solidification check valve, a bottom end cover and the heat exchange tube; the solidification check valve is configured to prevent the hydraulic oil in the heat exchange tube from flowing back into the inner oil bladder.

[0008] In the above technical solution, preferably, the energy release oil circuit is composed of a hydraulic steel pipe sequentially connected to the accumulator, an accumulator connector, an energy release solenoid valve, a bottom end cover, a flange adapter and the outer oil bladder tube; the energy release solenoid valve is a two-position two-way normally closed lift type zero-leakage solenoid valve.

[0009] In the above technical solution, preferably, the energy storage oil circuit is composed of a hydraulic steel pipe sequentially connected to the heat exchange tube, a bottom end cover, an energy storage check valve, an accumulator pressure sensor, an accumulator connector and the accumulator; the energy storage check valve is configured to prevent the hydraulic oil in the accumulator from flowing back into the heat exchange tube.

[0010] In the above technical solution, preferably, the pressurized gas circuit is composed of a hydraulic steel pipe connecting an air pump, an intake check valve, an exhaust solenoid valve, an air chamber pressure sensor, an oil tank end cover and an air chamber piston; the intake check valve is configured to prevent the leakage of high-pressure gas in the air chamber.

[0011] In the above technical solution, preferably, the accumulator is a piston type accumulator, and its internal nitrogen and hydraulic oil are isolated by an axially moving piston, and the pressure of the accumulator is monitored in real time by an accumulator pressure sensor.

[0012] In the above technical solution, preferably, the housing of the buoyancy adjustment hydraulic unit is successively connected by a flange adapter, a bottom end cover, a rear cabin housing, a middle rib ring, a middle rib ring filling ring, and a top end cover, and the air pressure inside the housing is less than the external atmospheric pressure.

[0013] In the above technical solution, preferably, the top end cover is provided with a cable through-hull threaded hole, and the cable through-hull is electrically connected to the seabed anchor mooring heave motion node through the threaded hole.

[0014] In the above technical solution, preferably, the outer oil bladder tube and the heat exchange tube are arranged around the buoyancy adjustment hydraulic unit in a circumferential form.

[0015] The ocean thermal energy buoyancy adjustment device for seabed anchor mooring heave motion nodes proposed by the present invention has many advantages and remarkable effects, and is of great significance in improving node performance, reducing energy consumption, and enhancing engineering adaptability.

[0016] First of all, the device uses ocean thermal energy as the power source, drives the buoyancy adjustment process through the seawater temperature gradient, realizes the substitution or supplement of the traditional electric energy drive mode, effectively alleviates the dependence of the node on the limited battery energy, significantly reduces the battery energy consumption rate, thereby prolongs the in-situ working time and self-sustaining time of the seabed anchor mooring heave motion node, and improves its long-term continuous operation ability.

[0017] Secondly, the device uses the buoyancy adjustment hydraulic unit as the core structure, and is designed with multiple heat exchange tubes and outer oil bladder tubes surrounding it, so that under the same volume condition, the device has a larger adjustable volume. This structural design significantly improves the buoyancy adjustment capacity and adjustment efficiency, has the advantages of strong buoyancy output, fast response speed, sufficient driving force, etc., and can better meet the heave power requirements of the node at different depths and working conditions.

[0018] Thirdly, the device of the present invention has the characteristics of modularization and strong independence, can be seamlessly integrated or upgraded and carried as an external module with the existing seabed anchor mooring heave motion node platform, avoids making major changes to the original node structure, has good system compatibility and popularization and application value, and is conducive to the rapid deployment of the ocean observation system and the construction of platform generalization.

[0019] In addition, the device converts energy by using natural and renewable temperature difference energy, has the characteristics of environmental protection and strong energy sustainability, helps to promote the development of low-carbon and intelligent marine equipment, and conforms to the trend of the future development of marine intelligent observation technology towards long-term autonomy and high energy efficiency.

[0020] In summary, the ocean thermal energy large-capacity buoyancy adjustment device of the present invention has multiple advantages in terms of structural optimization, energy innovation, system compatibility, and operation reliability. It can significantly improve the performance and practicality of the heave motion nodes of the subsea mooring system, and has broad engineering application prospects and promotion value. Brief Description of the Drawings

[0021] Figure 1a and 1b are schematic diagrams of the structure of the device of the present invention;

[0022] Figure 2a and Figure 2b are schematic diagrams of the internal structure of the device of the present invention;

[0023] Figure 3 is the working principle diagram of the present invention;

[0024] Figure 4 is the working principle diagram of the pressurized gas circuit of the present invention;

[0025] Figure 5 is the schematic diagram of the underwater working process of the present invention. Detailed Description of the Preferred Embodiments

[0026] In order to make the objectives, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0027] To solve the problems in the prior art that the heave motion nodes of the subsea mooring system rely on electric energy to drive buoyancy, resulting in limited energy, short self-sustaining time, frequent maintenance, and high operation costs, the present invention specifically provides an ocean thermal energy buoyancy adjustment device for the heave motion nodes of the subsea mooring system. To further illustrate the structure of the present invention, it is described in detail below with reference to the drawings:

[0028] As shown in Figure 1a , 1b and Figure 2a , 2b shows, the present invention provides an ocean thermal energy buoyancy adjustment device for the heave motion nodes of the subsea mooring system, which is mounted outside the heave motion nodes of the subsea mooring system. The ocean thermal energy large-capacity buoyancy adjustment device is composed of three parts: an outer oil bladder tube 2, a heat exchange tube 3, and a buoyancy adjustment hydraulic unit 1. The outer oil bladder tube 2 and the heat exchange tube 3 surround the buoyancy adjustment hydraulic unit 1 in a circular form. As shown in Figure 5 , the present invention, as a buoyancy driving device for the heave motion nodes of the subsea mooring system, performs heave motion underwater.

[0029] As shown in Figure 3As shown in the figure, the buoyancy adjustment hydraulic unit 1 includes: a flange adapter 109, a bottom end cover 110, a rear cabin housing 104, an energy release solenoid valve 101, an accumulator connector 112, a middle rib ring 117, a middle rib ring filler ring 118, an accumulator pressure sensor 113, an accumulator check valve 111, an accumulator 102, an oil storage solenoid valve 114, a solidification check valve 103, an oil storage check valve 115, a fuel tank lower housing 105, a fuel tank upper housing 124, an inner oil bladder 123, a gas chamber piston 121, a fuel tank end cover 122, an air pump 107, an exhaust solenoid valve 119, a gas chamber pressure sensor 106, an intake check valve 116, and a top end cover 120. The buoyancy adjustment hydraulic unit 1 is provided with four functional oil circuits and one pressurized gas circuit. The four functional oil circuits are respectively an oil storage oil circuit, a solidification oil circuit, an energy release oil circuit, and an energy storage oil circuit.

[0030] As Figure 4 shown, the fuel tank lower housing 105, the fuel tank upper housing 124, the inner oil bladder 123, and the gas chamber piston 121 form a variable-volume fuel tank. The inner oil bladder 123 is hermetically connected to the fuel tank upper housing 124 to form the oil storage chamber of the fuel tank. The fuel tank upper housing 124 is fixed to the fuel tank lower housing 105, and the gas chamber piston 121 is fitted to the fuel tank upper housing 124 in a piston manner. The gas chamber piston 121 squeezes the inner oil bladder 123 to help the oil drain out of the oil storage chamber. The connection of the oil storage oil circuit realizes the injection of oil from the outer oil bladder tube 2 into the fuel tank, that is, the hydraulic steel pipe is sequentially connected to the outer oil bladder tube 2, the flange adapter 109, the bottom end cover 110, the oil storage solenoid valve 114, the oil storage check valve 115, and the fuel tank lower housing 105.

[0031] As Figure 3 shown, the solidification oil circuit is formed by sequentially connecting the fuel tank lower housing 105, the solidification check valve 103, the bottom end cover 110, and the heat exchange tube 3 with a hydraulic steel pipe. The connection of the solidification oil circuit realizes the injection of oil from the inner oil bladder 123 into the heat exchange tube 3.

[0032] The energy release oil circuit is formed by sequentially connecting the accumulator 102, the accumulator connector 112, the energy release solenoid valve 101, the bottom end cover 110, the flange adapter 109, and the outer oil bladder tube 2 with a hydraulic steel pipe. The connection of the energy release oil circuit realizes the injection of oil from the accumulator 102 into the outer oil bladder tube 2.

[0033] The energy storage oil circuit is formed by sequentially connecting the heat exchange tube 3, the bottom end cover 110, the accumulator check valve 111, the accumulator pressure sensor 113, the accumulator connector 112, and the accumulator 102 with a hydraulic steel pipe. The connection of the energy storage oil circuit realizes the injection of oil from the heat exchange tube 3 into the accumulator 102.

[0034] The pressurized gas circuit is formed by connecting the air pump 107, the intake check valve 116, the exhaust solenoid valve 119, the gas chamber pressure sensor 106, the fuel tank end cover 122, and the gas chamber piston 121 with a hydraulic steel pipe. The pressurized gas circuit changes the air pressure in the gas chamber 126. AsFigure 4 When the air pressure in the air chamber 126 increases, the air chamber piston 121 squeezes the inner oil bladder 123, thereby realizing the oil discharge from the inner oil bladder 123 to the heat exchange tube 3 in the solidification oil circuit, and the outer oil bladder tube 2 injecting oil into the inner oil bladder 123 in the oil storage oil circuit. The air chamber 126 assists the fuel tank in storing and discharging oil by adjusting the internal air pressure, and is composed of the connection between the air chamber piston 121 and the fuel tank end cover 122.

[0035] As Figure 3 shown, the housing is successively connected and composed of a flange adapter 109, a bottom end cover 110, a rear cabin outer shell 104, a middle rib ring 117, a middle rib ring filler 118, and a top end cover 120. The air pressure inside the housing is less than the external atmospheric pressure.

[0036] The energy release solenoid valve 101, the oil storage solenoid valve 114, and the exhaust solenoid valve 119 are all two-position two-way normally closed lift-type zero-leakage solenoid valves. The solenoid valves adopted are based on their direct-acting working principle, and have the advantages of fast flow rate, high reliability, and preventing leakage of the oil circuit and the air circuit under high pressure conditions. In the energy release oil circuit, when the energy release solenoid valve 101 is powered on and starts, it can conduct the oil circuit between the accumulator 102 and the outer oil bladder tube 2; in the oil storage oil circuit, when the oil storage solenoid valve 114 is powered on and starts, it can conduct the oil circuit between the outer oil bladder tube 2 and the inner oil bladder 123; in the pressurized air circuit, when the exhaust solenoid valve 119 is powered on and starts, it can discharge the high-pressure gas in the air chamber 126.

[0037] The accumulator check valve 111 is installed in the accumulator oil circuit, and the accumulator check valve 111 can prevent the hydraulic oil in the accumulator 102 from flowing back into the heat exchange tube 3; the solidification check valve 103 is installed in the solidification oil circuit, and the solidification check valve 103 can prevent the hydraulic oil in the heat exchange tube 3 from flowing back into the inner oil bladder 123; the oil storage check valve 115 is installed in the oil storage oil circuit, and the oil storage check valve 115 can prevent the hydraulic oil in the inner oil bladder 123 from flowing back into the outer oil bladder tube 2; the intake check valve 116 is installed in the pressurized air circuit, and when the solidification oil circuit is working, the intake check valve 116 can prevent the high-pressure gas in the air chamber 126 from leaking from the air pump 107.

[0038] The accumulator pressure sensor 113 is installed in the accumulator oil circuit for detecting the accumulator pressure of the accumulator 102; the air chamber pressure sensor 106 is installed on the fuel tank end cover 122 for detecting the air pressure in the air chamber 126.

[0039] The accumulator 102 is a piston-type accumulator. The piston-type accumulator uses an axially moving piston 102a to isolate nitrogen and hydraulic oil. By using a piston-type accumulator to replace a bladder-type accumulator and a diaphragm-type accumulator, the radial space size constraint of the spatial layout of the buoyancy adjustment hydraulic unit is significantly reduced, and a structural layout form with a small diameter and a large length-to-diameter ratio is realized.

[0040] The top end cover 120 is provided with a threaded hole for a through-cabin cable, and the through-cabin cable 108 is screwed and fixed in the threaded hole for the through-cabin cable of the top end cover 120. The seabed anchoring heave and sink mobile node can implement two-way electrical control of the ocean temperature difference energy large-capacity buoyancy regulating device through the through-cabin cable 108.

[0041] The outer oil bag tube 2 is connected to the hydraulic steel pipe by a fixing frame and fixed on the buoyancy adjustment hydraulic unit 1. The outer oil bag tube 2 is in contact with seawater, and the ocean temperature difference can achieve the buoyancy adjustment function by changing the volume of the outer oil bag tube 2.

[0042] The heat exchange tube 3 is connected to the hydraulic steel pipe by a fixing frame and fixed on the buoyancy adjustment hydraulic unit 1. The ocean temperature difference can achieve the storage and discharge of hydraulic oil 302 in the heat exchange tube 3 through the volume change of the phase change material 301 in the heat exchange tube.

[0043] Specifically, the working process of the buoyancy regulating device of the present invention is as follows:

[0044] When the oil storage circuit, solidification circuit, energy release circuit and energy storage circuit of the device of the present invention work one by one, the seabed anchor system heave and sink mobile node performs four actions: diving preparation, diving, diving and floating conversion, and floating. Figure 5 As shown. The large-capacity buoyancy regulating device, powered by ocean temperature difference, is externally mounted on the subsea anchoring heave and sink mobile node. By changing its displacement volume, the device provides driving buoyancy for the subsea anchoring heave and sink mobile node. During the subsea anchoring heave and sink mobile node's dive preparation phase, the device's oil storage circuit operates. During the subsea anchoring heave and sink mobile node's dive phase, the device's solidification circuit operates. During the subsea anchoring heave and sink mobile node's transition phase, the device's energy release circuit operates. During the subsea anchoring heave and sink mobile node's ascent phase, the device's energy storage circuit operates.

[0045] During the diving preparation stage, the submarine anchored lifting and sinking mobile node initially floats on the sea surface in a positive buoyancy state. At this stage, the ocean temperature difference energy large-capacity buoyancy regulating device oil storage solenoid valve 114 and the exhaust solenoid valve 119 are opened, and the oil storage oil circuit is connected. At this time, the pressure on the inner oil bag 123 from the air chamber piston 121 is less than the atmospheric pressure on the outer oil bag tube 2. Under the action of this internal and external pressure difference, the hydraulic oil in the outer oil bag tube 2 flows into the inner oil bag 123 in sequence through the flange adapter 109, the bottom end cover 110, the oil storage solenoid valve 114, the oil storage one-way valve 115, and the lower shell 105 of the oil tank. At this time, the volume of the outer oil bag tube 2 is reduced, and the displacement of the ocean temperature difference energy large-capacity buoyancy regulating device is reduced. The submarine anchored lifting and sinking mobile node changes from positive buoyancy to negative buoyancy and enters the diving stage.

[0046] During the diving stage of the subsea mooring heaving and pitching node, the seawater temperature gradually decreases as the diving depth of the subsea mooring heaving and pitching node increases. During this stage, the solidifying oil circuit of the ocean thermal energy large-capacity buoyancy adjustment device operates. The heat exchange tube 3 is filled with a phase change material. After the seawater temperature is lower than the melting point of the phase change material, the phase change material begins to solidify and shrink. At the same time, the air pump 107 is powered on to pump air into the air chamber 126. The high-pressure gas pushes the air chamber piston 121 to squeeze the inner oil bladder 123. The hydraulic oil in the inner oil bladder 123 is supplemented into the heat exchange tube 3 successively through the oil tank lower housing 105, the solidifying one-way valve 103, and the bottom end cover 110 until the phase change material is completely solidified;

[0047] When the subsea mooring heaving and pitching node dives to the target depth, the subsea mooring heaving and pitching node enters the diving and floating conversion stage. During this stage, the energy release solenoid valve 101 of the ocean thermal energy large-capacity buoyancy adjustment device is opened, and the energy release oil circuit is conducted. The high-pressure oil stored in the accumulator 102 flows into the outer oil bladder tube 2 successively through the accumulator connector 112, the bottom end cover 110, and the flange adapter 109. The volume of the outer oil bladder tube 2 increases, and the pressure of the accumulator 102 gradually decreases until the pressure value of the accumulator 102 is equal to the water pressure at the depth where the subsea mooring heaving and pitching node is located. During this stage, the displacement of the ocean thermal energy large-capacity buoyancy adjustment device increases, and the subsea mooring heaving and pitching node changes from a negative buoyancy state to a positive buoyancy state and enters the floating stage;

[0048] During the floating stage of the subsea mooring heaving and pitching node, the seawater temperature gradually rises as the subsea mooring heaving and pitching node floats. During this stage, the energy storage oil circuit of the ocean thermal energy large-capacity buoyancy adjustment device operates. When the seawater temperature is higher than the melting point of the phase change material, the phase change material gradually melts and expands. The hydraulic oil in the heat exchange tube 3 is input into the accumulator 102 for storage successively through the bottom end cover 110, the energy storage one-way valve 111, and the accumulator connector 112. The oil pressure of the accumulator 102 continuously increases until the phase change material in the heat exchange tube 3 is completely melted. The subsea mooring heaving and pitching node completes a diving and floating working cycle and floats on the sea surface again.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ocean thermal energy buoyancy adjustment device for a seabed mooring heaving mobile node, characterized in that: It includes a buoyancy adjustment hydraulic unit, an outer oil bladder tube arranged around the buoyancy adjustment hydraulic unit, and a heat exchange tube; the buoyancy adjustment hydraulic unit includes: An oil storage oil circuit configured to inject the hydraulic oil in the outer oil bladder tube into the inner oil bladder; A solidification oil circuit configured to inject the hydraulic oil in the inner oil bladder into the heat exchange tube; An energy release oil circuit configured to inject the high-pressure oil in the accumulator into the outer oil bladder tube; An energy storage oil circuit configured to inject the hydraulic oil in the heat exchange tube into the accumulator; A pressurizing gas circuit configured to drive the flow of the oil in the oil storage oil circuit and the solidification oil circuit by adjusting the air pressure in the air chamber; Wherein, the heat exchange tube is internally provided with a phase change material, and the volume change of the phase change material is caused by the change of the seawater temperature, driving the hydraulic oil to circulate between the energy storage oil circuit and the solidification oil circuit to realize buoyancy adjustment.

2. The ocean thermal energy buoyancy adjustment device for a seabed mooring heaving and moving node according to claim 1, characterized in that: The oil storage oil circuit is composed of a hydraulic steel pipe sequentially connected to the outer oil bladder tube, a flange adapter, a bottom end cover, an oil storage solenoid valve, an oil storage check valve, and a lower oil tank housing; the oil storage check valve is configured to prevent the hydraulic oil in the inner oil bladder from flowing back into the outer oil bladder tube.

3. The ocean thermal energy buoyancy adjustment device for a seabed mooring heaving and moving node according to claim 1, characterized in that: The solidification oil circuit is composed of a hydraulic steel pipe sequentially connected to the lower oil tank housing, a solidification check valve, a bottom end cover, and the heat exchange tube; the solidification check valve is configured to prevent the hydraulic oil in the heat exchange tube from flowing back into the inner oil bladder.

4. The ocean thermal energy buoyancy adjustment device for a seabed mooring heaving mobile node according to claim 1, characterized in that: The energy release oil circuit is composed of a hydraulic steel pipe sequentially connected to the accumulator, an accumulator connector, an energy release solenoid valve, a bottom end cover, a flange adapter, and the outer oil bladder tube; the energy release solenoid valve is a two-position two-way normally closed lifting type zero-leakage solenoid valve.

5. The ocean thermal energy buoyancy adjustment device for a seabed mooring heaving moving node according to claim 1, characterized in that: The energy storage oil circuit is composed of a hydraulic steel pipe sequentially connected to the heat exchange tube, a bottom end cover, an energy storage check valve, an accumulator pressure sensor, an accumulator connector, and the accumulator; the energy storage check valve is configured to prevent the hydraulic oil in the accumulator from flowing back into the heat exchange tube.

6. The ocean thermal energy buoyancy adjustment device for a seabed mooring heaving mobile node according to claim 1, characterized in that: The pressurizing gas circuit is composed of a hydraulic steel pipe connecting an air pump, an intake check valve, an exhaust solenoid valve, an air chamber pressure sensor, a tank end cover, and an air chamber piston; the intake check valve is configured to prevent the leakage of high-pressure gas in the air chamber.

7. The ocean thermal energy buoyancy adjustment device for a seabed mooring heaving mobile node according to claim 1, characterized in that: The accumulator is a piston type accumulator, and the nitrogen and the hydraulic oil are isolated inside it by an axially moving piston, and the pressure of the accumulator is monitored in real time by the accumulator pressure sensor.

8. The ocean thermal energy buoyancy adjustment device for a seabed mooring heaving mobile node according to claim 1, characterized in that: The housing of the buoyancy adjustment hydraulic unit is sequentially connected by a flange adapter, a bottom end cover, a rear cabin outer shell, a middle rib ring, a middle rib ring filler ring, and a top end cover, and the air pressure inside the housing is less than the external atmospheric pressure.

9. The ocean thermal energy buoyancy adjustment device for a seabed mooring heaving mobile node according to claim 1, characterized in that: The top end cover is provided with a through-cabin cable threaded hole, and the through-cabin cable is electrically connected to the subsea anchor mooring heave motion node through the threaded hole.

10. The ocean thermal energy buoyancy adjustment device for a seabed mooring heaving and moving node according to claim 1, characterized in that: The outer oil bladder tube and the heat exchange tube are arranged around the buoyancy adjustment hydraulic unit in a circumferential form.

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