A pressure-resistant oil tank for a deep diving lift platform and the deep diving lift platform

Abstract

This invention belongs to the field of underwater oil storage tanks, and specifically relates to a pressure-resistant oil tank for a deep-sea submersible lifting platform and the platform itself. To maintain good stability and hydrodynamic characteristics of the deep-sea submersible lifting platform, this invention proposes a pressure-resistant oil tank, including a tank body. An elastic fluid bladder is installed on the tank body to divide the internal space of the tank body into a water chamber and an oil chamber. A sea valve is installed on the tank body to connect the water chamber to the external space of the tank body. An oil outlet is provided on the tank body to connect the oil chamber to an oil pipe. This invention also proposes a deep-sea submersible lifting platform using this pressure-resistant oil tank, with the oil chamber connected to the oil-using equipment via an oil pipe. On the one hand, after the deep-sea submersible lifting platform submerges into the deep sea, the tank body deforms, but this does not affect the elastic fluid bladder, ensuring that the oil tank does not fail. On the other hand, during the ascent and descent of the deep-sea submersible lifting platform, the sea valve remains closed, the water pressure in the water chamber remains constant, and the elastic fluid bladder is subjected to balanced forces, avoiding continuous chronic damage to the elastic fluid bladder.

Description

Technical Field

[0001] This invention belongs to the field of underwater oil storage tanks, and in particular relates to a pressure-resistant oil tank for a deep-sea elevating platform and a deep-sea elevating platform. Background Technology

[0002] When hydrological information needs to be collected, monitoring platforms must be set up at appropriate locations in the ocean. In areas prone to storms and other severe sea conditions, floating platforms cannot withstand the onslaught of storms, so levitation platforms are often used for hydrological monitoring. In good sea conditions, the levitation platform can rise to a designated location, and if necessary, even surface, facilitating hydrological monitoring. In severe sea conditions, the levitation platform must descend to deeper waters. For example, in the event of a waterspout, the platform must be lowered to deeper waters, where waterspouts have minimal impact, thus preventing the levitation platform from being destroyed.

[0003] Chinese utility model patent with authorization announcement number CN205246073U and authorization announcement date of May 18, 2016, discloses a fixed-point self-elevating marine environmental measurement platform, including a float (equivalent to an elevator platform) and an anchoring weight for sinking to the seabed and anchoring there. The float is equipped with a measuring device and an underwater motor winch. The mooring cable of the underwater motor winch is connected to the anchoring weight. The mooring cable pulls the float to keep it at the same water depth. At the same time, by releasing and retrieving the mooring cable, the float can be raised or lowered, thereby adjusting the depth of the measuring device to facilitate the monitoring of hydrological information such as hydrology and water quality in the sea area.

[0004] The buoy is also equipped with a satellite communication device, which is used to send monitoring data back to the data center on shore when the buoy surfaces.

[0005] In one type of deep-sea submersible lifting platform disclosed in the aforementioned utility model patent, batteries and / or fuel oil are required as the energy source for continuous operation. For lifting platforms using fuel oil as the energy source, with long-term operation, the fuel in the tank is gradually consumed, resulting in a decrease in the weight of the fuel and the lifting platform. However, the displacement of the tank and the lifting platform remains unchanged. When the lifting platform is stationary, the tension of the mooring cable on the lifting platform gradually increases, meaning the force on the mooring cable continuously increases, making the mooring cable prone to breakage. Simultaneously, because the weight of the fuel in the tank decreases while the weight of other parts of the lifting platform remains unchanged, the stability and hydrodynamic characteristics of the lifting platform deteriorate.

[0006] To solve this problem, seawater needs to be added to the oil tank to compensate for the weight loss caused by fuel consumption.

[0007] Currently, in the field of shallow-sea oil storage, there is an oil-water replacement tank that compensates for the weight loss caused by crude oil flowing out of the tank by replenishing the tank with seawater.

[0008] For example, Chinese invention patent application CN105151579A, published on December 16, 2015, discloses an oil-water replacement type oil storage tank. The oil storage tank includes a tank body and a baffle (equivalent to a piston) disposed in the tank body. The baffle divides the internal space of the tank body into a water chamber and an oil chamber. The tank body is provided with an inlet and outlet for water that connects the water chamber to the external space of the tank body and an inlet and outlet for oil that connects the oil chamber to the oil pipe.

[0009] When oil is injected into the oil chamber, the pressure inside the oil chamber increases, the baffle moves, the oil chamber enlarges, and the water in the water chamber is discharged from the inlet and outlet. When oil is pumped out of the oil chamber, the pressure inside the oil chamber decreases, the baffle moves, the oil chamber shrinks, and seawater enters the water chamber from the inlet and outlet.

[0010] However, if the above-mentioned oil storage tank is used to separate the oil chamber and the water chamber by a partition, the tank body will deform if it is used directly in the deep sea, causing the seal at the partition to fail, the partition to be unable to move, the water chamber and the oil chamber to be connected, and the entire oil storage tank will fail.

[0011] Meanwhile, the aforementioned oil storage tanks are designed for environments that are always located in shallow seas, without the need for buoyancy or descent, thus the water pressure remains constant. However, if applied to a lifting platform, the water pressure would constantly change as the platform rises and falls. While the volume of oil in the oil chamber would remain constant, the volume of oil vapor generated by evaporation would continuously fluctuate, causing the baffles to operate slowly. This would result in chronic damage to the seals at the baffles, leading to a shorter lifespan for the seals.

[0012] Therefore, there is an urgent need for a pressure-resistant oil tank that can adapt to the rising and falling requirements of the lifting platform, achieve oil-water replacement, and remain unfailed in deep-sea environments. Summary of the Invention

[0013] The purpose of this invention is to provide a pressure-resistant oil tank for deep-sea elevating platforms, so as to solve the technical problem that existing oil-water replacement type oil storage tanks are not suitable for deep-sea elevating platforms.

[0014] The present invention also aims to provide a deep-sea submersible lifting platform to solve the technical problem that the stability and hydrodynamic characteristics of the deep-sea submersible lifting platform are poor after fuel consumption.

[0015] To achieve the above objectives, the technical solution for the pressure-resistant oil tank for a deep-sea submersible lifting platform provided by this invention is as follows: A pressure-resistant oil tank for a deep-sea submersible lifting platform includes a tank body, an elastic liquid bladder installed on the tank body to divide the internal space of the tank body into a water chamber and an oil chamber, a sea valve installed on the tank body to connect the water chamber with the external space of the tank body, and an oil outlet provided on the tank body to connect the oil chamber with an oil pipe.

[0016] The beneficial effects are as follows: The core difference between this invention and the existing oil-water replacement tank is that: (1) an elastic liquid bladder is used to separate the water chamber and the oil chamber; (2) the water chamber is equipped with a sea valve, and seawater can enter and exit the water chamber when the sea valve is opened.

[0017] Based on the above core differences (1), after the deep-sea submersible elevator platform is submerged into the deep sea, the tank body deforms, but it does not affect the elastic liquid bladder, so as to ensure that the oil tank does not fail.

[0018] Based on the above core differences (2), when the deep-sea submersible lifting platform is raised or lowered, the sea valve is kept closed to ensure that the water pressure in the water chamber remains constant and the elastic fluid bladder is in force balance, thus avoiding the continuous change in the shape of the elastic fluid bladder and causing it to be continuously subjected to chronic damage. When the oil in the oil chamber decreases, the sea valve is opened, and the elastic fluid bladder undergoes elastic deformation in a short period of time. After that, when the oil in the oil chamber no longer decreases, the elastic fluid bladder is in force balance again. Finally, the sea valve is closed.

[0019] The above-mentioned core differences (1) and (2) work together to enable the pressure tank to adapt to the deep-sea lifting platform, thereby enabling the deep-sea lifting platform to maintain good stability and hydrodynamic characteristics.

[0020] Furthermore, the sea valve is a pressure reducing valve.

[0021] The beneficial effects are as follows: when the oil in the oil chamber decreases, if the tank is located in a deep-sea area, the difference between the water pressure in the water chamber and the water pressure of the outside seawater is large. In order to prevent the outside seawater from rushing into the water chamber and causing the elastic liquid bladder to be subjected to excessive instantaneous force, a pressure reducing valve is used to limit the flow rate of seawater into the water chamber in order to protect the elastic liquid bladder.

[0022] Furthermore, the tank body includes a first sub-tank and a second sub-tank, which are sealed together. The elastic liquid bladder has an mounting edge that is clamped at the connection between the first and second sub-tanks. The mounting edge is sealed to each sub-tank. The first sub-tank and the elastic liquid bladder form the water cavity, and the second sub-tank and the elastic liquid bladder form the oil cavity.

[0023] The beneficial effects are: the elastic liquid bladder is clamped by the sub-tank to achieve the installation of the elastic liquid bladder, which is convenient.

[0024] Furthermore, the elastic fluid bladder also includes a bellows section and a sealing section, with one axial side of the bellows section connected to the mounting edge and the other axial side sealed by the sealing section.

[0025] The beneficial effects are: the corrugated section is easy to lengthen and shorten, so the elastic fluid bladder is easy to deform; at the same time, the lengthening and shortening of the corrugated section can reduce the tension on the elastic fluid bladder and extend its service life.

[0026] Furthermore, the tank is also equipped with a one-way exhaust valve that connects the upper part of the oil chamber with the external space of the tank and allows the oil and gas in the oil chamber to be discharged in one direction.

[0027] The beneficial effect is that some fuel vapor will inevitably evaporate from the fuel in the oil chamber. In order to avoid excessive pressure in the oil tank, a one-way exhaust valve is used to discharge the excess fuel vapor.

[0028] To achieve the above objectives, the technical solution for the deep-sea submersible lifting platform provided by this invention is as follows: A deep-sea submersible lifting platform includes a lifting platform body, oil supply equipment, and an oil tank installed on the lifting platform body for exposure in seawater. The oil tank includes a tank body, an elastic liquid bladder installed on the tank body to divide the internal space of the tank body into a water chamber and an oil chamber, a sea valve installed on the tank body to connect the water chamber with the external space of the tank body, and the tank body is connected to the oil chamber and the oil supply equipment through an oil pipe.

[0029] The beneficial effects are as follows: The core difference between the oil tank used in the deep-sea elevating platform of the present invention and the existing oil-water replacement oil tank is that: (1) an elastic liquid bladder is used to separate the water chamber and the oil chamber; (2) the water chamber is equipped with a sea valve, and seawater can enter and exit the water chamber when the sea valve is opened.

[0030] Based on the above core differences (1), after the deep-sea submersible elevator platform is submerged into the deep sea, the tank body deforms, but it does not affect the elastic liquid bladder, so as to ensure that the oil tank does not fail.

[0031] Based on the above core differences (2), when the deep-sea submersible lifting platform is raised or lowered, the sea valve is kept closed to ensure that the water pressure in the water chamber remains constant and the elastic fluid bladder is in force balance, thus avoiding the continuous change in the shape of the elastic fluid bladder and causing it to be continuously subjected to chronic damage. When the oil in the oil chamber decreases, the sea valve is opened, and the elastic fluid bladder undergoes elastic deformation in a short period of time. After that, when the oil in the oil chamber no longer decreases, the elastic fluid bladder is in force balance again. Finally, the sea valve is closed.

[0032] The above-mentioned core differences (1) and (2) work together to enable the pressure tank to adapt to the deep-sea lifting platform, thereby enabling the deep-sea lifting platform to maintain good stability and hydrodynamic characteristics.

[0033] Furthermore, the sea valve is a pressure reducing valve.

[0034] The beneficial effects are as follows: when the oil in the oil chamber decreases, if the tank is located in a deep-sea area, the difference between the water pressure in the water chamber and the water pressure of the outside seawater is large. In order to prevent the outside seawater from rushing into the water chamber and causing the elastic liquid bladder to be subjected to excessive instantaneous force, a pressure reducing valve is used to limit the flow rate of seawater into the water chamber in order to protect the elastic liquid bladder.

[0035] Furthermore, the tank body includes a first sub-tank and a second sub-tank, which are sealed together. The elastic liquid bladder has an mounting edge that is clamped at the connection between the first and second sub-tanks. The mounting edge is sealed to each sub-tank. The first sub-tank and the elastic liquid bladder form the water cavity, and the second sub-tank and the elastic liquid bladder form the oil cavity.

[0036] The beneficial effects are: the elastic liquid bladder is clamped by the sub-tank to achieve the installation of the elastic liquid bladder, which is convenient.

[0037] Furthermore, the elastic fluid bladder also includes a bellows section and a sealing section, with one axial side of the bellows section connected to the mounting edge and the other axial side sealed by the sealing section.

[0038] The beneficial effects are: the corrugated section is easy to lengthen and shorten, so the elastic fluid bladder is easy to deform; at the same time, the lengthening and shortening of the corrugated section can reduce the tension on the elastic fluid bladder and extend its service life.

[0039] Furthermore, the tank is also equipped with a one-way exhaust valve that connects the upper part of the oil chamber with the external space of the tank and allows the oil and gas in the oil chamber to be discharged in one direction.

[0040] The beneficial effect is that some fuel vapor will inevitably evaporate from the fuel in the oil chamber. In order to avoid excessive pressure in the oil tank, a one-way exhaust valve is used to discharge the excess fuel vapor. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of the pressure-resistant oil tank for the deep-sea elevating platform of the present invention when the oil content is relatively large; Figure 2 This is a schematic diagram of the structure of the pressure-resistant oil tank for the deep-sea elevating platform of the present invention when the amount of oil in the tank is relatively small; Figure 3 for Figure 2 A schematic diagram of the structure of a medium elastic fluid bladder.

[0042] Explanation of reference numerals in the attached figures: 1. Sea valve; 2. First sub-tank; 3. One-way exhaust valve; 4. Elastic liquid bladder; 4-1. Mounting edge; 4-2. Bellows section; 4-3. Sealing section; 5. Second sub-tank; 6. Inlet / outlet oil valve. Detailed Implementation

[0043] To address the problems in the background art, the core inventive concept of this invention is to use an elastic liquid bladder to separate the water cavity and the oil cavity. The elastic liquid bladder is elastic, so it can prevent separation failure when the tank body deforms. At the same time, it ensures that the external seawater and the water cavity are not connected when the lifting platform is raised and lowered, so that the force on the elastic liquid bladder is always balanced, avoiding continuous damage to the elastic liquid bladder during the raising and lowering of the lifting platform, thereby extending the life of the elastic liquid bladder.

[0044] The present invention will be further described in detail below with reference to the embodiments.

[0045] An embodiment of the pressure-resistant oil tank for a deep-sea submersible lifting platform provided by the present invention: like Figures 1-3 As shown, the pressure-resistant fuel tank for the deep-sea submersible lifting platform includes a tank body. An elastic fluid bladder 4 is installed on the tank body to divide the internal space into a water chamber and an oil chamber. A sea valve 1 is installed on the tank body to connect the water chamber to the external space of the tank body. The tank body has inlet and outlet ports, and inlet / outlet valves 6 can be installed at the inlet and outlet ports. The inlet / outlet valves 6 are connected to oil pipes to connect the oil chamber to the fuel-using equipment on the deep-sea submersible lifting platform, thereby using the fuel in the tank to supply fuel to the fuel-using equipment. An oil pump and flow valve can be installed on the fuel-using equipment or oil pipes to achieve metered fuel usage. During normal operation of the deep-sea submersible lifting platform, the inlet and outlet ports only discharge fuel and do not receive fuel; therefore, the inlet and outlet ports can also be called outlet ports. After the deep-sea submersible lifting platform surfaces, a refueling vessel can replenish the pressure-resistant fuel tank. Refueling can be done through the inlet / outlet ports, or a separate refueling port can be installed on the tank body for refueling.

[0046] like Figures 1-3 As shown, the tank body includes a first sub-tank 2 and a second sub-tank 5, which are sealed together. The elastic liquid bladder 4 has an mounting edge 4-1 that is clamped at the connection between the first sub-tank 2 and the second sub-tank 5. The mounting edge 4-1 is sealed to each sub-tank. The first sub-tank 2 and the elastic liquid bladder 4 form the water cavity, and the second sub-tank 5 and the elastic liquid bladder 4 form the oil cavity.

[0047] exist Figures 1-3 In the illustrated embodiment, the first sub-tank 2 and the second sub-tank 5 are flanged together, and the mounting edge 4-1 is clamped between the mating flanges of each sub-tank to achieve a seal between each sub-tank and the elastic liquid bladder 4. To ensure a good seal, the bolts at the flange connection need to be tightened to a set torque; if necessary, a sealing ring can also be installed between the mounting edge 4-1 and the mating flange.

[0048] In other embodiments, each sub-tank may also have a connecting ring, with the mounting edge 4-1 clamped between the connecting rings of the two sub-tanks. After the two connecting rings clamp the mounting edge 4-1, the two connecting rings are fixedly connected by welding or other means.

[0049] After applying the aforementioned pressure-resistant oil tank to a deep-sea submersible lifting platform, during the platform's ascent or descent, the sea valve 1 remains closed. At this time, although the depth of the pressure-resistant oil tank and the water pressure around the tank are constantly changing, the water pressure inside the water chamber remains unchanged. Therefore, the elastic fluid bladder 4 maintains a force balance, and its shape remains unchanged. This prevents the elastic fluid bladder 4 from undergoing continuous chronic damage due to its changing shape, thus extending its service life.

[0050] When the pressure tank supplies oil to the oil-using equipment, the inlet / outlet valve 6 and the sea valve 1 are opened. The oil in the oil chamber is continuously reduced, and seawater enters the water chamber to compensate for the reduced weight caused by the decrease in oil in the oil chamber, ensuring that the deep-sea submersible lifting platform still has good stability and hydrodynamic characteristics.

[0051] After the deep-sea submersible platform surfaces, it can be inspected and the pressure tank refueled. The following is a suggested refueling method: After closing the inlet / outlet valve 6, remove the pressure tank. Then, connect the inlet pipe to the inlet / outlet valve 6, open the valve, and refuel the tank using a refueling vessel or similar equipment. During refueling, the sea valve 1 opens, the elastic bladder 4 contracts, and the water inside the bladder 4 is forced out of the water chamber.

[0052] In this invention, when the pressure tank is in a deep-sea environment and needs to supply oil to oil-using equipment, when the sea valve 1 is opened, the pressure difference between the water inside the elastic bladder 4 and the external water pressure is too large, causing seawater to rush into the elastic bladder 4. This results in a rapid pressure change within the elastic bladder 4, affecting its service life. To overcome this problem, in a preferred embodiment, the sea valve 1 is a pressure reducing valve. The pressure reducing valve can be any existing pressure reducing valve, and its main function is to limit the rate at which seawater rushes into the elastic bladder 4. When the pressure difference between the elastic bladder 4 and the external environment is large, the opening degree of the pressure reducing valve is small to avoid the elastic bladder 4 expanding too quickly and to extend its service life.

[0053] During fuel storage, fuel inevitably evaporates into vapors. The presence of these vapors causes the pressure inside the tank to continuously increase. Although the elastic fluid bladder 4 maintains force balance due to the incompressibility of liquids, if the pressure inside the tank becomes too high, and the tank floats to the surface or into shallow water, where the external water pressure is low, the pressure difference between the inside and outside of the tank will be large, posing a risk of tank rupture. To eliminate this risk, in a preferred embodiment, the tank is also equipped with a one-way vent valve 3, which connects the upper part of the oil chamber to the external space of the tank and allows the vapors inside the oil chamber to be discharged in one direction. When the vapor pressure is high, the one-way vent valve 3 can be used to discharge the vapors.

[0054] In embodiments without a one-way vent valve 3, if an excessive pressure difference is detected inside and outside the tank when it floats, the sea valve 1 can be opened in an emergency. Under the pressure of the oil and gas, the liquid bladder contracts, and the water in the water chamber is discharged to the outside, thereby increasing the volume of the oil chamber while the volume of the fuel remains essentially unchanged. Therefore, the pressure of the oil and gas will decrease rapidly, thus eliminating the risk of tank rupture. It should be noted that this emergency situation is not a routine procedure. Under normal circumstances, the sea valve 1 should not be opened when the tank floats.

[0055] In one embodiment, the elastic fluid bladder 4 is a hemispherical fluid bladder, which has a large tension when it expands.

[0056] In a preferred embodiment, such as Figures 1-3 As shown, the elastic fluid bladder 4 also includes a bellows section 4-2 and a sealing section 4-3. One axial side of the bellows section 4-2 is connected to the mounting edge 4-1, and the other axial side is sealed by the sealing section 4-3. The sealing section 4-3 is cylindrical, and its outer diameter is smaller than the inner diameter of the tank body, so as to create a gas passage for oil and gas to flow between the tank body and the sealing section 4-3. The bellows section 4-2 is easy to extend and shorten, so the elastic fluid bladder 4 is easy to deform; at the same time, the extension and shortening of the bellows can reduce the tension on the elastic fluid bladder 4 and extend its service life.

[0057] In this invention, to improve the pressure-bearing capacity of the tank, both ends of the tank are spherical shells so that the water pressure is applied evenly to the tank and the tank is prevented from breaking due to stress concentration.

[0058] An embodiment of the deep-sea submersible lifting platform provided by the present invention: The deep-sea submersible lifting platform includes a lifting platform body, oil supply equipment installed on the lifting platform body, and an oil tank installed on the lifting platform body for exposure in seawater. The oil tank is any one of the pressure-resistant oil tanks for the deep-sea submersible lifting platform of this invention. An oil pipe is connected to the oil supply equipment to transport oil from the oil chamber to the oil supply equipment. Figure 1 and Figure 2 In the embodiment shown, the oil tank is fixedly connected to the lifting platform body by a bracket. The bracket and the oil tank can be welded together, and the bracket and the lifting platform body can be fixedly connected by bolts or welding.

[0059] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features, or organically combine different embodiments to create the embodiments shown in the accompanying drawings. Of course, those skilled in the art can also create other embodiments not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure-resistant oil tank for a deep-sea submersible lifting platform, comprising a tank body, characterized in that, The tank is equipped with an elastic liquid bladder that divides the internal space of the tank into a water chamber and an oil chamber. The tank is also equipped with a sea valve that connects the water chamber to the external space of the tank. The tank is also equipped with an oil outlet that connects the oil chamber to the oil pipe.

2. The pressure-resistant oil tank for a deep-sea submersible lifting platform as described in claim 1, characterized in that, The sea valve is a pressure reducing valve.

3. The pressure-resistant oil tank for a deep-sea submersible lifting platform as described in claim 1 or 2, characterized in that, The tank body includes a first sub-tank and a second sub-tank, which are sealed together. The elastic liquid bladder has an installation edge that is clamped at the connection between the first and second sub-tanks. The installation edge is sealed to each sub-tank. The first sub-tank and the elastic liquid bladder form the water cavity, and the second sub-tank and the elastic liquid bladder form the oil cavity.

4. The pressure-resistant oil tank for a deep-sea submersible lifting platform as described in claim 3, characterized in that, The elastic fluid bladder also includes a bellows section and a sealing section. One axial side of the bellows section is connected to the mounting edge, and the other axial side is sealed by the sealing section.

5. The pressure-resistant oil tank for a deep-sea submersible lifting platform as described in claim 1 or 2, characterized in that, The tank is also equipped with a one-way exhaust valve that connects the upper part of the oil chamber to the external space of the tank and allows the oil and gas in the oil chamber to be discharged in one direction.

6. A deep-sea submersible lifting platform, comprising a lifting platform body, oil supply equipment, and an oil tank installed on the lifting platform body for exposure in seawater, characterized in that, The oil tank includes a tank body, on which is installed an elastic liquid bladder for dividing the internal space of the tank body into a water chamber and an oil chamber. The tank body is also equipped with a sea valve for connecting the water chamber to the external space of the tank body. The tank body is connected to the oil chamber and the oil-using equipment through an oil pipe.

7. The deep-sea submersible lifting platform as described in claim 6, characterized in that, The sea valve is a pressure reducing valve.

8. The deep-sea submersible lifting platform as described in claim 6 or 7, characterized in that, The tank body includes a first sub-tank and a second sub-tank, which are sealed together. The elastic liquid bladder has an installation edge that is clamped at the connection between the first and second sub-tanks. The installation edge is sealed to each sub-tank. The first sub-tank and the elastic liquid bladder form the water cavity, and the second sub-tank and the elastic liquid bladder form the oil cavity.

9. The deep-sea submersible lifting platform as described in claim 8, characterized in that, The elastic fluid bladder also includes a bellows section and a sealing section. One axial side of the bellows section is connected to the mounting edge, and the other axial side is sealed by the sealing section.

10. The deep-sea submersible lifting platform as described in claim 6 or 7, characterized in that, The tank is also equipped with a one-way exhaust valve that connects the upper part of the oil chamber to the external space of the tank and allows the oil and gas in the oil chamber to be discharged in one direction.

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