Self-adaptive gravity oil tank of underwater navigation body

Abstract

The invention relates to the technical field of oil tanks of underwater navigation bodies, in particular to a self-adaptive gravity oil tank of an underwater navigation body. The system comprises an oil supply tank, a detection module, an oil storage tank and a water bag, wherein the oil supply tank is used for supplying oil to a fuel main engine; the detection module is arranged on the oil supply tank and is used for monitoring the oil quantity in the oil supply tank; the oil storage tank is connected with the oil supply tank, and the oil storage tank is used for supplementing oil to the oil supply tank when oil in the oil supply tank is insufficient; the water bag is arranged at the bottom of the inner side of the oil storage tank, the water bag is communicated with an external water area, and when fuel oil in the oil storage tank flows into the oil supply tank, water in the external water area flows into the water bag to supplement the weight of the consumed fuel oil. Through the design of the oil tank and the water bag, external water is introduced into the oil tank, and gravity buoyancy balance in the fuel consumption process is completed under the condition that no extra space such as a water storage cabin is needed.

Description

Technical Field

[0001] The invention relates to the technical field of oil tanks for underwater vehicles, and in particular to an adaptive gravity oil tank for underwater vehicles. Background Art

[0002] With the expansion and development of the ocean, various forms and functions of navigation bodies have been invented. Compared with ordinary ships, some new underwater navigation bodies are more sensitive to the depth and posture in the water due to their own functions and design requirements. For example, underwater navigation bodies or semi-submersible navigation bodies need to ensure the relative balance of their own gravity and buoyancy during long-term missions. At the same time, in order to ensure the endurance requirements, the weight of the navigation body fully loaded with fuel can reach one-tenth of the total weight or even higher. Therefore, after consuming fuel during a long mission, the navigation body will have its own buoyancy changed due to a significant decrease in total weight, and it is necessary to rebalance the buoyancy in the water by additionally adjusting the horizontal rudder and other methods. This will affect the endurance of the navigation body at the least, and fail to complete the design mission at the worst. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an adaptive gravity fuel tank for an underwater navigation body, which solves the problem of gravity and buoyancy imbalance caused by fuel consumption of the navigation body.

[0004] In order to achieve the above-mentioned and other related purposes, the present invention provides an adaptive gravity oil tank for an underwater navigation body, comprising:

[0005] Fuel supply tank, used to supply fuel to the fuel main engine;

[0006] A detection module, which is arranged on the oil supply tank, and is used to monitor the oil amount in the oil supply tank;

[0007] An oil storage tank connected to the oil supply tank, the oil storage tank being used to replenish oil to the oil supply tank when the oil in the oil supply tank is insufficient;

[0008] A water bag is arranged at the inner bottom of the oil storage tank. The water bag is connected to the external water area. When the fuel in the oil storage tank flows into the fuel supply tank, the water in the external water area flows into the water bag to supplement the weight of the consumed fuel.

[0009] In one embodiment of the present invention, it further includes:

[0010] An oil-passing valve, which is disposed between the oil supply tank and the oil storage tank and installed at the bottom of the oil supply tank and the oil storage tank;

[0011] A water valve connected to the water bag;

[0012] A refueling port is arranged at the top of the oil storage tank, and the refueling port is used for externally refueling the oil storage tank.

[0013] In one embodiment of the present invention, it further includes:

[0014] An oil-passing valve, which is disposed between the oil supply tank and the oil storage tank and installed near the top of the oil supply tank and the oil storage tank;

[0015] A water valve connected to the water bag;

[0016] The oil filling valve is arranged at the bottom of the oil storage tank. The oil filling valve is connected to the external fuel through a first oil pump. The first oil pump is used to add oil to the oil storage tank. The first oil pump is also connected to the filling port.

[0017] In one embodiment of the present invention, the detection module is a liquid level meter.

[0018] In one embodiment of the present invention, it further includes:

[0019] A first vent, which is arranged on the top of the oil storage tank, and the first vent is connected to a vent solenoid valve;

[0020] The ventilation solenoid valve is used to open to the atmosphere and balance the pressure in the oil storage tank.

[0021] In one embodiment of the present invention, it further includes:

[0022] A water flow meter is installed between the water valve and the water bag.

[0023] In one embodiment of the present invention, it further includes:

[0024] a second oil pump, one end of which is connected to the oil-passing valve, and the second oil pump is used to supply fuel from the oil storage tank to the oil supply tank;

[0025] An oil flow meter has one end connected to the other end of the second oil pump, and the other end of the oil flow meter is connected to the oil supply tank.

[0026] In one embodiment of the present invention, it further includes:

[0027] A vent pipe is installed on the top of the oil supply tank to communicate with the atmosphere.

[0028] As described above, the adaptive gravity oil tank for an underwater navigation body of the present invention has the following beneficial effects:

[0029] (1) The adaptive gravity fuel tank of the underwater vehicle of the present invention includes a fuel supply tank, a detection module, an oil storage tank, and a water bag. The present invention introduces external water into the fuel tank through the design of the fuel tank and the water bag, and completes the gravity buoyancy balance during the fuel consumption process without the need for additional space such as a water storage compartment.

[0030] (2) The adaptive gravity oil tank of the underwater vehicle of the present invention divides the oil tank into an oil storage tank and an oil supply tank, thereby ensuring that the oil supply tank is not affected by the expansion and contraction changes of the oil bag, thereby ensuring a stable oil supply environment for the main engine.

[0031] (3) The process of refueling the oil supply tank from the oil storage tank of the adaptive gravity oil tank of the underwater vehicle of the present invention can be set by a program, thus avoiding the trouble and mistakes of manual operation, and can be used on various unmanned vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of an adaptive gravity fuel tank for an underwater vehicle provided in one embodiment of the present application.

[0033] Figure 2 A schematic diagram of a full-oil structure of an adaptive gravity fuel tank for an underwater vehicle provided in one embodiment of the present application.

[0034] Figure 3 A schematic diagram of a full-water structure of an adaptive gravity fuel tank for an underwater vehicle provided in one embodiment of the present application.

[0035] Figure 4 A schematic diagram of a full oil tank structure of an adaptive gravity oil tank for an underwater vehicle provided in another embodiment of the present application.

[0036] Figure 5 A schematic diagram of the full water structure of an adaptive gravity fuel tank for an underwater vehicle provided in another embodiment of the present application.

[0037] Component number description

[0038] 1 Fuel supply tank

[0039] 2 Oil storage tank

[0040] 3 Water bladder

[0041] 4 Detection module

[0042] 5-way oil valve

[0043] 6 Water valve

[0044] 7 Fuel filler

[0045] 8 First vent

[0046] 9 Ventilation solenoid valve

[0047] 10 Water flow meter

[0048] 11 Second oil pump

[0049] 12 Oil flow meter

[0050] 13 Ventilation tube

[0051] 15 Oil filling valve

[0052] 16 First oil pump DETAILED DESCRIPTION

[0053] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0054] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0055] Terms such as first or second can be used to describe various components, but these components are not limited by the above terms. The above terms are used to distinguish one component from another component, for example, without departing from the scope of the concept according to the present disclosure, a first component can be referred to as a second component, and similarly, a second component can be referred to as a first component.

[0056] In addition, "connected / coupled" means that one component is directly electrically coupled to another component or is indirectly electrically coupled through another component. The singular form may include the plural form unless explicitly stated in the sentence. In addition, "include / comprise" or "includes / comprises" used in this specification indicates that one or more components, steps, operations, and elements exist or have been added. The specific structural or functional descriptions of the examples of the implementation of the concepts disclosed in this specification are only illustrated to describe the examples of the implementation of the concepts, and the examples of the implementation of the concepts can be implemented in various forms, but these descriptions are not limited to the examples of the implementation described in this specification.

[0057] According to the concept, various modifications and changes can be applied to the examples of the embodiments, so that the examples of the embodiments will be illustrated in the drawings and described in the specification. However, the examples of the embodiments according to the concept are not limited to the specific embodiments, but include all changes, equivalents or replacements included in the spirit and technical scope of the present disclosure.

[0058] It should be understood that when an element is described as being "coupled" or "connected" to another element, the element may be directly coupled or directly connected to the other element, or may be coupled or connected to the other element through a third element. Conversely, it should be understood that when an element is referred to as being "directly coupled to" or "directly coupled to" another element, no other element is placed between them. Other expressions describing the relationship between components (i.e., "between" and "directly between" or "adjacent to" and "directly adjacent to") need to be interpreted in the same manner.

[0059] The terms used in this specification are only used to describe specific examples of the embodiments and are not intended to limit the present disclosure. If there is no clear opposite meaning in the context, the singular form may include the plural form. In this specification, it should be understood that the term "including" or "having" indicates the presence of the features, quantities, steps, operations, components, parts or combinations thereof described in the specification, but the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, parts or combinations thereof cannot be precluded.

[0060] If there is no contrary definition, all terms (including technical terms or scientific terms) used herein have the same meaning as those generally understood by ordinary technicians in the field. If the terms defined in the commonly used dictionary are not clearly defined in this specification, they should be interpreted as having the same meaning as in the context of the relevant technology, and not interpreted as ideal or overly formal meanings.

[0061] Descriptions of well-known components and processing techniques may be omitted so as not to unnecessarily obscure the embodiments of the disclosure.

[0062] Throughout the specification, the same reference numerals refer to the same elements. Thus, even if a reference numeral is not mentioned or described with reference to one figure, it may be mentioned or described with reference to another figure. Furthermore, even if a reference numeral is not shown in one figure, it may be mentioned or described with reference to another figure.

[0063] In addition, the logic level of the signal may be different or opposite to the described logic level. For example, a signal described as having a logic "high" level may alternatively have a logic "low" level, and a signal described as having a logic "low" level may alternatively have a logic "high" level.

[0064] The following will describe the various embodiments of the present disclosure in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present disclosure, many technical details are provided in order to enable the reader to better understand the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present disclosure can be implemented.

[0065] See also Figure 1 , Figure 2 , Figure 3 , Figure 1 A schematic structural diagram of an adaptive gravity fuel tank for an underwater vehicle provided in one embodiment of the present application. Figure 2 A schematic diagram of a full-oil structure of an adaptive gravity fuel tank for an underwater vehicle provided in one embodiment of the present application. Figure 3 A schematic diagram of a full-water structure of an adaptive gravity tank for an underwater navigation body provided as an embodiment of the present application. The present invention provides an adaptive gravity tank for an underwater navigation body, comprising a fuel supply tank 1, a detection module 4, an oil storage tank 2, and a water bag 3. The fuel supply tank 1 is used to supply fuel to the fuel main engine; the detection module 4 is arranged on the fuel supply tank 1, and the detection module 4 is used to monitor the amount of oil in the fuel supply tank 1; the oil storage tank 2 is connected to the fuel supply tank 1, and the fuel storage tank 2 is used to replenish the fuel supply tank 1 when the amount of oil in the fuel supply tank 1 is insufficient; the water bag 3 is arranged at the inner bottom of the fuel storage tank 2, and the water bag 3 is connected to the external water area. When the fuel in the fuel storage tank 2 flows into the fuel supply tank 1, the water in the external water area flows into the water bag 3 to supplement the weight of the consumed fuel.

[0066] Specifically, an adaptive gravity fuel tank for an underwater navigation body of the present invention also includes an oil through valve 5, a water through valve 6, and a refueling port 7. The oil through valve 5 is arranged between the oil supply tank 1 and the oil storage tank 2, and is installed at the bottom of the oil supply tank 1 and the oil storage tank 2; the water through valve 6 is connected to the water bag 3; the refueling port 7 is arranged at the top of the oil storage tank 2, and the refueling port 7 is used for external refueling of the oil storage tank 2.

[0067] Specifically, the detection module 4 is a liquid level meter.

[0068] Specifically, an adaptive gravity oil tank for an underwater navigation body of the present invention also includes a first air vent 8 and a ventilation solenoid valve 9. The first air vent 8 is arranged on the top of the oil storage tank 2, and the first air vent 8 is connected to the ventilation solenoid valve 9; the ventilation solenoid valve 9 is used to open to the atmosphere to balance the pressure in the oil storage tank 2.

[0069] Specifically, the adaptive gravity oil tank for an underwater vehicle of the present invention further includes a water flow meter 10 , which is installed between the water valve 6 and the water bag 3 .

[0070] Specifically, an adaptive gravity oil tank for an underwater navigation body of the present invention also includes a second oil pump 11 and an oil flow meter 12. One end of the second oil pump 11 is connected to the oil valve 5; one end of the oil flow meter 12 is connected to the other end of the second oil pump 11, and the other end of the oil flow meter 12 is connected to the oil supply tank 1.

[0071] In one embodiment of the present invention, a refueling port 7 and a first air vent 8 are provided on the top of an oil storage tank 2 of an adaptive gravity oil tank for an underwater navigation body of the present invention. The refueling port 7 is used to refuel the oil storage tank 2 from the outside; the first air vent 8 is connected to the ventilation solenoid valve 9 through a pipeline to the atmosphere, and is used to balance the internal pressure of the oil storage tank 2. The bottom of the oil storage tank 2 is connected to the oil supply tank 1 through a pipeline, an oil flow meter 12, an oil valve 5 and a second oil pump 11. When the oil level inside the oil storage tank 2 drops and cannot automatically flow into the oil supply tank 1, the second oil pump 11 can be used to extract the remaining fuel. The water bag 3 inside the oil storage tank 2 is connected to the outside of the navigation body through a pipeline, a water flow meter 10 and a water valve 6. The oil supply tank 1 is provided with an oil outlet and an oil return port to connect to the fuel main engine, and a first air vent 8 is provided on the top to connect to the atmosphere to balance the pressure. The oil level in the oil supply tank 1 is monitored by a liquid level gauge. The roaming tank state after shore-based refueling is shown as follows Figure 2 shown.

[0072] The specific oil supply process of the adaptive gravity oil tank of an underwater vehicle of the present invention during one mission is as follows:

[0073] S1, open the oil valve 5 and the water valve 6, and the water in the water bag 3 flows out through the water valve 6;

[0074] S2, add oil to the oil storage tank 2 from the top filling port 7 of the oil storage tank 2. At this time, since the bottom of the oil storage tank 2 is connected to the oil supply tank 1, the oil level of the oil supply tank 1 will also rise synchronously. When the liquid level meter detects that the liquid level reaches the specified full oil height, close the oil valve 5. Continue to add oil to the oil storage tank 2 until the oil storage tank 2 is full of oil. In this process, the water bag 3 is naturally squeezed and flattened due to the gravity of the oil inside the oil storage tank 2, and the residual water is discharged;

[0075] S3, close the water valve 6, the refueling port 7 and related pipelines to complete the shore-based refueling process;

[0076] S4, during the launching mission of the navigation body, the fuel supply tank 1 continuously supplies fuel to the main engine until the liquid level of the fuel supply tank 1 reaches the specified fuel replenishment height;

[0077] S5, open the oil valve 5, the water valve 6, the ventilation solenoid valve 9 and the second oil pump 11;

[0078] S6, the second oil pump 11 draws fuel into the fuel supply tank 1 until the liquid level in the fuel supply tank 1 reaches a specified height, and the oil valve 5 is closed. During this period, the oil flow meter 12 monitors the amount of oil passing through, and external air enters the oil storage tank 2 to balance the pressure;

[0079] S7, after the water valve 6 is opened, external water enters the water bag 3, and when the water flow meter 10 monitors that the water inflow reaches the same mass volume as the oil replenishment amount, the water valve 6 is closed;

[0080] S8. Repeat steps S4 to S7 until the navigation body is recovered ashore.

[0081] Steps S4 to S7 are the first method of refueling the fuel supply tank 1 in water, and the overall mass of the front and rear navigation bodies, i.e., the gravity they are subjected to, does not change significantly. During a mission, the navigation body may need to undergo several refueling processes. At the same time, the lower and upper limit liquid levels of the refueling of the fuel supply tank 1 can be adjusted to make the total mass change curve of the navigation body more stable during the whole process.

[0082] When the vehicle refueling process reaches the limit number of times, the fuel in the fuel storage tank 2 is completely consumed except for the dead zone. Taking seawater and diesel as an example, the water bag 3 will store about 0.84 times the volume of the refueling volume, which is basically the same as the refueling mass. The difference in volume in the fuel storage tank 2 is filled with air. The fuel supply tank 1 retains the fuel for the last mission or return recovery operation. Figure 3 shown.

[0083] See also Figure 4 , Figure 5 The adaptive gravity oil tank for an underwater navigation body of the present invention also includes an oil through valve 5, a water through valve 6, and an oil filling valve 15. The oil through valve 5 is arranged between the oil supply tank 1 and the oil storage tank 2, and is installed near the top of the oil supply tank 1 and the oil storage tank 2; the water through valve 6 is connected to the water bag 3; the oil filling valve 15 is arranged at the bottom of the oil storage tank 2, and the oil filling valve 15 is connected to the external fuel through the first oil pump 16.

[0084] In another embodiment of the present invention, an oil filling valve 15 connected to the oil filling port is provided at the bottom of the oil storage tank 2 of an adaptive gravity oil tank for an underwater navigation body of the present invention, and the oil filling port is used for an external oil pump, namely, a first oil pump 16, to pressurize and fill oil into the oil storage tank 2. The connection port between the oil storage tank 2 and the oil supply tank 1 is moved to the top, and the interface connection pipeline passes through the oil passing solenoid valve, namely, the oil passing valve 5 to reach the oil supply tank 1. The water bag 3 inside the oil storage tank 1 is connected to the outside of the navigation body through a pipeline, a water flow meter 10 and a water passing solenoid valve, namely, the water passing valve 6. The oil supply tank 1 is provided with an oil outlet and an oil return port to connect to the fuel main engine, and a vent pipe 13 is provided on the top to connect to the atmospheric balance pressure, and the oil level in the oil supply tank 1 is monitored by a liquid level gauge. The roaming tank status after shore-based refueling is shown as follows Figure 4 shown.

[0085] The specific oil supply process of the adaptive gravity oil tank of an underwater vehicle of the present invention during one mission is as follows:

[0086] S1, open the oil filling valve 15, the oil valve 5 and the water valve 6;

[0087] S2, the external first oil pump 16 fills oil into the oil storage tank 2 through the pipeline connected to the oil filling port. During the process, the oil level in the oil storage tank 2 rises, and the air in the oil storage tank 2 is squeezed into the oil supply tank 1 through the pipeline connected to the oil supply tank 1, and discharged into the atmosphere through the vent pipe 13 of the oil supply tank 1. When the air in the oil storage tank 2 is completely discharged and filled with fuel, the first oil pump 16 continues to fill oil into the oil storage tank 2, and the fuel also enters the oil supply tank 1 through the oil supply pipeline. When the liquid level meter detects that the oil supply tank 1 is full of oil, the oil valve 5 is closed;

[0088] S3, at this time, the pressure of the first oil pump 16 can be controlled to continue to inject oil into the oil storage tank 2, and a certain injection pressure can be maintained for a certain period of time to observe whether water is discharged from the water valve 6, which is helpful to fully squeeze the water bag 3 and reduce the dead zone;

[0089] S4, close the oil filling valve 15 and the water valve 6, remove the first oil pump 16 and related pipelines, and complete the shore-based refueling process;

[0090] S5. During the launching mission of the navigation body, the fuel supply tank 1 continuously supplies fuel to the main engine until the liquid level of the fuel supply tank 1 reaches the specified fuel replenishment height;

[0091] S6, open the oil valve 5 and the water valve 6;

[0092] S7, after the water valve 6 is opened, external water enters the water bag 3, the water bag 3 expands, and squeezes an equal volume of fuel into the fuel tank 1 through the fuel supply pipeline;

[0093] S8, when the water flow meter monitors that the volume conversion mass of water entering the water bag 3 reaches the mass of fuel consumed after the last refueling process, the water valve 6 and the oil valve 5 are closed;

[0094] S9. Repeat steps S5 to S8 until the navigation body is recovered ashore.

[0095] Steps S5 to S8 are the second way of replenishing oil in the oil supply tank 1. Similarly, the total mass change curve of the navigation body can be made more stable during the whole process by adjusting the lower limit and upper limit of the oil supply tank 1 each time.

[0096] Compared with the first implementation, the overall mass of the navigation body before and after refueling, that is, the gravity it is subjected to, does not change significantly, but the process is simpler and uses fewer valves and equipment.

[0097] The difference between the two methods is that the first method converts part of the space of the oil storage tank 2 into air to balance the volume difference under the same mass caused by the difference in density between fuel and water, while the second method uses the space of the fuel supply tank 1 to balance this difference. Therefore, the oil storage tank 2 of the second method is filled with liquid throughout the whole process. During the refueling process, the amount of fuel replenished into the fuel supply tank 1 is the same as the volume of water entering, and the mass of water is the same as the mass of consumed fuel. Therefore, after each refueling process, the upper limit of the liquid level of the fuel supply tank 1 is reduced accordingly. Therefore, the capacity of the fuel supply tank 1 also needs to meet a certain proportion of the capacity of the oil storage tank, so that after the oil storage tank 2 is completely filled with water, a certain liquid level height can still be maintained to complete subsequent navigation and tasks.

[0098] In summary, the present invention provides an adaptive gravity tank for an underwater navigation body, which can introduce external water into the tank to balance the overall gravity loss during the continuous consumption of fuel. It is mainly divided into three parts: an oil storage tank, a water bag, and an oil supply tank. When in use, the water bag interface connects the pipeline to the external water area, and the bag is placed inside the oil storage tank; the oil storage tank is connected to the oil supply tank pipeline; the oil supply tank directly supplies oil to the main engine. The tank controls the flow of oil and water through the valve in the middle of the pipeline, and monitors the oil and water data through the flow meter and the liquid level gauge. In actual use, since the navigation body itself should have a certain attitude adjustment function, in order to simplify the process, the oil and water volume can also be directly replaced 1:1. Although the difference in oil and water density will cause the navigation body to become heavier as a whole, it also greatly reduces the difficulty of the navigation body to adjust its own attitude. For navigation bodies that are very sensitive to gravity, the present invention also provides two ways of replenishing oil to balance the gravity difference caused by the difference in oil and water density. The tank structure does not occupy an additional cabin, and the operation process can be automatically completed by the program. It has a certain versatility for the tanks of various underwater navigation bodies.

[0099] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An adaptive gravity oil tank for an underwater vehicle, characterized in that: include: A fuel supply tank (1), used for supplying fuel to the fuel main engine; A detection module (4) is arranged on the oil supply tank (1), and the detection module (4) is used to monitor the oil volume in the oil supply tank (1); An oil storage tank (2) connected to the oil supply tank (1), the oil storage tank (2) being used to replenish oil to the oil supply tank (1) when the oil level in the oil supply tank (1) is insufficient; A water bag (3) is arranged at the inner bottom of the oil storage tank (2). The water bag (3) is connected to an external water area. When the fuel in the oil storage tank (2) flows into the fuel supply tank (1), the water in the external water area flows into the water bag (3) to supplement the weight of the consumed fuel.

2. The adaptive gravity oil tank for an underwater vehicle according to claim 1, characterized in that: Also includes: An oil-passing valve (5) is arranged between the oil supply tank (1) and the oil storage tank (2), and is installed at the bottom of the oil supply tank (1) and the oil storage tank (2); A water valve (6) connected to the water bag (3); A refueling port (7) is arranged at the top of the oil storage tank (2), and the refueling port (7) is used to refuel the oil storage tank (2) from the outside.

3. The adaptive gravity oil tank for an underwater vehicle according to claim 1, characterized in that: Also includes: An oil-passing valve (5) is arranged between the oil supply tank (1) and the oil storage tank (2), and is installed near the top of the oil supply tank (1) and the oil storage tank (2); A water valve (6) connected to the water bag (3); An oil filling valve (15) is arranged at the bottom of the oil storage tank (2). The oil filling valve (15) is connected to external fuel through a first oil pump (16). The first oil pump (16) is used to fill the oil storage tank (2). The first oil pump (16) is also connected to the oil filling port (7).

4. The adaptive gravity oil tank for an underwater vehicle according to claim 1, characterized in that: The detection module (4) is a liquid level meter.

5. The adaptive gravity oil tank for an underwater vehicle according to claim 2, characterized in that: Also includes: A first vent (8) is arranged on the top of the oil storage tank (2), and the first vent (8) is connected to a vent solenoid valve (9); The ventilation solenoid valve (9) is used to open to the atmosphere and balance the pressure in the oil storage tank (2).

6. The adaptive gravity oil tank for an underwater vehicle according to claim 2, characterized in that: Also includes: A water flow meter (10) is installed between the water flow valve (6) and the water bag (3).

7. The adaptive gravity oil tank for an underwater vehicle according to claim 2, characterized in that: Also includes: A second oil pump (11), one end of which is connected to the oil-passing valve (5), and the second oil pump (11) is used to supply fuel from the oil storage tank (2) to the oil supply tank (1); An oil flow meter (12) has one end connected to the other end of the second oil pump (11), and the other end of the oil flow meter (12) is connected to the oil supply tank (1).

8. The adaptive gravity oil tank for an underwater vehicle according to claim 2 or 3, characterized in that: Also includes: A vent pipe (13) is installed on the top of the oil supply tank (1) to communicate with the atmosphere.

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