An integrated water cooling system for a submersible vehicle and methods of use thereof

Abstract

This invention discloses an integrated water-cooling system for submersibles, comprising an external cooling device, an air conditioning chiller condenser, a seawater-freshwater heat exchanger, and a battery distilled water cooler. One side of the external cooling device is connected to a main water supply line, and the other side is connected to a main return water line. The main water supply line is connected to several first water supply branches and several second water supply branches. The first water supply branches, the cold source channel of the battery distilled water cooler, and the main return water line are sequentially connected. The second water supply branches, the cold source channel of the air conditioning chiller condenser, the heat source channel of the seawater-freshwater heat exchanger, and the main return water line are sequentially connected. This invention also discloses a method for using the integrated water-cooling system for submersibles. The beneficial effects of this invention are: it integrates and designs dispersed cooling systems, optimizes structural configuration, and reduces space occupation.

Description

Technical Field

[0001] This invention relates to the field of cooling support technology, specifically to an integrated water-cooling system for underwater vehicles and its usage method. Background Technology

[0002] Currently, the water cooling systems of underwater vehicles generally suffer from the following problems: 1. Low integration: Underwater vehicles are usually equipped with multiple decentralized seawater cooling systems, such as auxiliary engine seawater cooling systems and battery seawater cooling systems, which occupy a large amount of internal space; 2. Low equipment utilization: For example, the battery seawater cooling system is idle most of the time, resulting in resource waste; 3. Existing cooling systems usually use seawater pumps to introduce external seawater into the interior for cooling, resulting in significant sea noise; 4. As the diving depth of underwater vehicles continues to break through, the decentralized configuration of seawater cooling systems leads to a significant increase in pressure boundaries, and the interfaces and pipeline nodes of various cooling systems become potential risk points, greatly increasing the probability of leakage and failure of the system in the high-pressure environment of the deep sea.

[0003] Therefore, the water cooling system of the submersible needs to be redesigned. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an integrated water-cooling system for submersibles and its usage method, aiming to solve the problems of low integration and large space occupation of existing submersible water-cooling systems.

[0005] The technical solution adopted in this invention is: an integrated water cooling system for submarines, including an external cooling device, an air conditioning chiller condenser, a seawater-freshwater heat exchanger, and a battery distilled water cooler;

[0006] The external cooling device is located on the outside of the submersible;

[0007] One side of the external cooling device is connected to the main water supply line, and the other side of the external cooling device is connected to the main return line.

[0008] The main water supply line is connected to several first water supply branches and several second water supply branches;

[0009] The first water supply branch is connected to the inlet of the cold source channel of the battery distilled water cooler, and the outlet of the cold source channel of the battery distilled water cooler is connected to the main return water branch through the first return water branch.

[0010] The second water supply branch is connected to the cold source channel of the condenser of the air conditioning chiller unit; the outlet of the cold source channel of the condenser of the air conditioning chiller unit is connected to the inlet of the heat source channel of the seawater-freshwater heat exchanger through a connecting pipe, and the outlet of the heat source channel of the seawater-freshwater heat exchanger is connected to the main return water line through the second return water branch.

[0011] According to the above scheme, the inlet of the cold source channel of the seawater-freshwater heat exchanger is connected to the seawater inlet pipeline, and a seawater cooling pump is installed on the seawater inlet pipeline; the outlet of the cold source channel of the seawater-freshwater heat exchanger is connected to the seawater outlet pipeline.

[0012] According to the above scheme, the main water supply pipeline includes a first water supply pipe section and a second water supply pipe section connected together, and a first freshwater circulation pump is provided between the first water supply pipe section and the second water supply pipe section; each first water supply branch is connected to the first water supply pipe section; and each second water supply branch is connected to the second water supply pipe section.

[0013] According to the above scheme, the main return water pipeline includes a first return water pipe section and a second return water pipe section connected together, and a second fresh water circulation pump is provided between the first return water pipe section and the second return water pipe section; each first return water branch is connected to the first return water pipe section; and each second return water branch is connected to the second return water pipe section.

[0014] According to the above plan, two sets of battery distilled water coolers and two sets of air conditioning chiller condensers are installed, along with two seawater and freshwater heat exchangers, two first water supply branches, two first return water branches, two second water supply branches, and two second return water branches.

[0015] According to the above plan, valves are installed on the main water supply line and the main return line.

[0016] According to the above plan, valves are installed on the first return water branch and the second supply water branch.

[0017] The present invention also employs a method of using an integrated water-cooling system for a submersible, the method being: providing the integrated water-cooling system for a submersible as described above;

[0018] Under underwater conditions, the first freshwater circulation pump is started, driving the circulating freshwater into the external cooling device. The circulating freshwater exchanges heat with the seawater outside the submersible in the external cooling device. After the heat exchange, the circulating freshwater with a lower temperature enters the air conditioning chiller condenser and other freshwater cooling users to cool and exchange heat with them. After the heat exchange, the circulating freshwater with a higher temperature flows back to the external cooling device for cooling. This cycle is repeated to achieve heat exchange between the circulating freshwater and the external cooling seawater.

[0019] Under surface operating conditions, the first freshwater circulation pump, the second freshwater circulation pump, and the seawater cooling pump are started. The freshwater circulation pump drives the circulating freshwater into the battery distilled water cooler. In the battery distilled water cooler, the circulating freshwater absorbs the heat transferred by the distilled water. The heated circulating freshwater enters the air conditioning chiller condenser for heat exchange. After passing through the air conditioning chiller condenser, the circulating freshwater temperature rises again and enters the seawater freshwater heat exchanger to exchange heat with the cooling seawater. After the heat exchange, the cooled circulating freshwater returns to the battery distilled water cooler. This cycle repeats continuously, transferring the heat from the battery distilled water cooler, the air conditioning chiller condenser, and other users to the cooling seawater via the circulating freshwater.

[0020] According to the above scheme, under water surface conditions, the circulating fresh water absorbs the heat transferred by the distilled water in the battery distilled water cooler, and the temperature rises by 0.5~1℃.

[0021] According to the above scheme, the external cooling device will not work under water surface conditions.

[0022] The beneficial effects of this invention are as follows:

[0023] (1) Improved system integration and reduced resource consumption. Based on the principle of the human blood circulation system, this invention integrates the scattered cooling systems such as the auxiliary engine seawater cooling system and the battery seawater cooling system of the submarine into a unified design, and constructs a ship-wide integrated water cooling system, which improves the integration of the water cooling system, optimizes the structural configuration, and also reduces space consumption.

[0024] (2) Improved safety of deep-sea diving of submersibles. The integrated water cooling system of the present invention replaces the original decentralized seawater cooling system, which greatly reduces the pressure boundary; in underwater operation, the external cooling device provides a cold source for the freshwater cooling cycle for underwater natural cooling, while the seawater cooling cycle is in a closed state, which can greatly improve the safety of deep-sea diving of submersibles.

[0025] (3) Reduced noise of the water cooling system. The integrated water cooling system of the present invention can operate with only one freshwater circulation pump in underwater conditions, without the need to turn on the seawater pump; compared with the prior art, it can eliminate the noise of ocean currents, reduce the radiated noise of the water cooling system, and greatly improve the quietness of the system. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a specific embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of fluid flow under underwater conditions (solid lines represent freshwater flow, and dotted lines represent freshwater cutoff).

[0028] Figure 3This is a schematic diagram of fluid flow under water surface conditions (solid lines represent freshwater flow, dotted lines represent freshwater cutoff, and dashed lines represent seawater flow).

[0029] Figure 4 This is a schematic diagram of the existing water cooling system configuration. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0033] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, without contradiction. Additionally, the term "a plurality of" indicates two or more.

[0035] Example

[0036] Figures 1-3 In the accompanying drawings, the labels are as follows: 1—External cooling device, 2—Battery distilled water cooler, 3—First freshwater circulation pump, 4—Air conditioning chiller condenser, 5—Seawater-freshwater heat exchanger, 6—Seawater cooling pump, 7—Other freshwater cooling users, 8—Valve, 9—Second freshwater circulation pump.

[0037] like Figures 1-3 The integrated water cooling system shown is an integrated water cooling system for a submarine based on the principle of human blood circulation. It includes an external cooling device 1, an air conditioning chiller condenser 4, a seawater and freshwater heat exchanger 5, and a battery distilled water cooler 2.

[0038] The external cooling device 1 is located outside the submersible (in the external liquid tank or superstructure of the submersible).

[0039] One side of the external cooling device 1 is connected to the main water supply line, and the other side of the external cooling device 1 is connected to the main return line.

[0040] The main water supply line is connected to several first water supply branches and several second water supply branches;

[0041] The first water supply branch is connected to the inlet of the cold source channel of the battery distilled water cooler 2, and the outlet of the cold source channel of the battery distilled water cooler 2 is connected to the main return water branch through the first return water branch.

[0042] The second inlet branch is connected to the cold source channel of the air conditioning chiller condenser 4; the outlet of the cold source channel of the air conditioning chiller condenser 4 is connected to the inlet of the heat source channel of the seawater-freshwater heat exchanger 5 through a connecting pipe, and the outlet of the heat source channel of the seawater-freshwater heat exchanger 5 is connected to the main return water pipeline through the second return water branch.

[0043] In this invention, the main water supply line, the branch water supply lines, the main return water line, and the corresponding return water branches constitute a freshwater circulation loop. The integrated water cooling system may also include a third supply water branch and a third return water branch for providing circulating freshwater to other cooling users. The external cooling device 1 simultaneously supplies cooling freshwater to the air conditioning chiller condenser 4 and other freshwater cooling users 7 through the corresponding freshwater circulation loop.

[0044] Preferably, the cold source channel inlet of the seawater-freshwater heat exchanger 5 is connected to the seawater inlet pipeline, and a seawater cooling pump 6 is installed on the seawater inlet pipeline; the cold source channel outlet of the seawater-freshwater heat exchanger 5 is connected to the seawater outlet pipeline.

[0045] In this invention, cooling seawater and fresh water exchange heat in the seawater-fresh water heat exchanger 5, and the seawater carries away the heat corresponding to the cooling user.

[0046] Preferably, the main water supply pipeline includes a first water supply pipe section and a second water supply pipe section connected together, and a first freshwater circulation pump 3 is provided between the first water supply pipe section and the second water supply pipe section; each first water supply branch is connected to the first water supply pipe section; and each second water supply branch is connected to the second water supply pipe section.

[0047] Preferably, the main return water pipeline includes a first return water pipe section and a second return water pipe section connected together, and a second freshwater circulation pump 9 is provided between the first return water pipe section and the second return water pipe section; each first return water branch is connected to the first return water pipe section; and each second return water branch is connected to the second return water pipe section.

[0048] In this embodiment, two sets of battery distilled water coolers 2 and two sets of air conditioning chiller condensers 4 are provided, along with two seawater and freshwater heat exchangers 5, two first water supply branches, two first return water branches, two second water supply branches, and two second return water branches.

[0049] In this invention, valves 8 are respectively installed on the main water supply line, the main return line, the first return branch line, and the second water supply branch line.

[0050] The relevant equipment and components in this embodiment are described as follows:

[0051] 1) External Cooling Device 1: External cooling device 1 is used for heat exchange between circulating fresh water and seawater under underwater operating conditions (seawater temperature ≤20°C), which can avoid the operation of the underwater seawater cooling pump 6. External cooling device 1 is an existing device composed of several rows of B30 cupronickel heat exchange tubes. Both ends of the heat exchange tubes are end caps and inlet and outlet pipes (fresh water flows inside the heat exchange tubes). Since external cooling device 1 directly uses external seawater to cool the circulating fresh water, the heat exchange tubes are not encased in a shell and are directly exposed in the seawater.

[0052] 2) Battery Distilled Water Cooler 2: The battery distilled water cooler 2 is used for heat exchange between distilled water and circulating fresh water. The heat from the battery is transferred to the distilled water, and then discharged from the circulating fresh water to the seawater. In traditional solutions, the battery distilled water cooler 2 is a high-pressure shell-and-tube heat exchanger with distilled water and seawater on one side and the other side on the other. In this invention, the battery distilled water cooler 2 has distilled water and circulating fresh water on both sides, resulting in better water quality. Microchannel heat exchanger technology can be used to reduce the volume of the battery distilled water cooler 2 by more than 50%.

[0053] 3) Freshwater Circulation Pump 3: Both the first freshwater circulation pump 3 and the second freshwater circulation pump 9 are power sources for freshwater circulation. One freshwater circulation pump is installed on each of the port and starboard sides of the submersible, similar to the heart in the human body. Since the freshwater circulation pressure is relatively low, typically 0.6 MPa, pipeline pump technology can be used to integrate the pump unit and circulation pipeline, reducing the volume occupied by the pump unit. The freshwater circulation pumps are set to multiple operating speeds: in underwater conditions, two pumps operate at low speed or one pump operates at high speed; in surface conditions, both pumps operate at high speed.

[0054] 4) Air Conditioning Chiller Condenser 4: The air conditioning chiller condenser 4 is a component of the air conditioning chiller unit, used to achieve heat exchange between the refrigerant and circulating fresh water. In traditional solutions, the air conditioning chiller condenser 4 is a shell-and-tube heat exchanger, with refrigerant and seawater on opposite sides; in this invention, the air conditioning chiller condenser 4 has refrigerant and circulating fresh water on opposite sides, the medium being relatively clean, and the volume of the air conditioning chiller condenser 4 can be significantly reduced using microchannel heat exchanger technology.

[0055] 5) Seawater-freshwater heat exchanger 5: The seawater-freshwater heat exchanger 5 is used for heat exchange between circulating freshwater and seawater under water surface conditions. The circulating freshwater flows through the condenser 4 of the air conditioning chiller unit and is heated, and then enters the seawater-freshwater heat exchanger 5 to be cooled by seawater.

[0056] 6) Seawater cooling pump 6: Seawater cooling pump 6 is used to provide cooling seawater for seawater-freshwater heat exchanger 5 under surface conditions. Under underwater conditions, this pump set is usually not in operation.

[0057] 7) Other freshwater cooling users 7: Other freshwater cooling users 7 include cooling users such as hydraulic oil coolers, refrigeration units, and inverter power supply units.

[0058] 8) Valve 8: Used to control the flow of fresh water in the fresh water circulation. The valve 8 is opened and closed according to the different fresh water circulation conditions of the underwater and surface submersible.

[0059] In this invention, the external cooling device 1, the air conditioning chiller condenser 4, the seawater-freshwater heat exchanger 5, and the battery distilled water cooler 2 are all located in the same freshwater cooling system.

[0060] A method of using a water-cooling system for a submersible, the method being:

[0061] Under underwater conditions, the temperature of the seawater outside the submersible is usually 20°C. The first freshwater circulation pump 3 is started to drive the circulating freshwater into the external cooling device 1. The circulating freshwater exchanges heat with the seawater outside the submersible in the external cooling device 1. After the heat exchange, the circulating freshwater with a lower temperature enters the air conditioning chiller condenser 4 and other freshwater cooling users 7 to cool and exchange heat with the air conditioning chiller condenser 4 and other freshwater cooling users 7. After the heat exchange, the circulating freshwater with a higher temperature flows back to the external cooling device 1 for cooling. This cycle is repeated to achieve heat exchange between the circulating freshwater and the external cooling seawater.

[0062] Under surface conditions, the temperature of the seawater outside the submersible is typically 30°C. The first freshwater circulation pump 3, the second freshwater circulation pump 9, and the seawater cooling pump 6 are activated to drive circulating freshwater into a battery distilled water cooler 2 (only one battery distilled water cooler 2 is operational). The circulating freshwater absorbs heat transferred from the distilled water in the battery distilled water cooler 2, increasing its temperature by 0.5~1°C. At this time, the external cooling device 1 is not operational. The heated circulating freshwater enters the air conditioning chiller condenser 4 (and other freshwater cooling users 7) for heat exchange. After heat exchange in the air conditioning chiller condenser 4, the circulating freshwater temperature increases by approximately 4°C before entering the seawater-freshwater heat exchanger 5 to exchange heat with the cooling seawater. The cooled circulating freshwater merges with the circulating freshwater flowing out from other freshwater cooling users 17 and returns to the battery distilled water cooler 2. This cycle repeats continuously, transferring heat from the battery distilled water cooler 2, the air conditioning chiller condenser 4, and other users to the cooling seawater via the circulating freshwater.

[0063] In this invention, circulating fresh water absorbs the heat transferred by distilled water in the battery distilled water cooler 2. The heat dissipation of the battery distilled water cooler is small, and the temperature rises by 0.5~1℃.

[0064] In this invention, under normal underwater operating conditions, the battery distilled water cooler 2 does not require cooling, the valve 8 on the corresponding branch is closed, the seawater-freshwater heat exchanger 5 is not working, the seawater cooling pump 6 is shut down, and the seawater cooling pump 6 is not working.

[0065] This invention, based on the respective operating characteristics and heat dissipation of the battery seawater cooling system and the auxiliary machine seawater cooling system under different operating conditions, rationally arranges the positions of the battery distilled water cooler 2, the air conditioning chiller condenser 4, and the seawater-freshwater heat exchanger 5 in the freshwater circulation. Since the battery distilled water cooler 2 has a large heat dissipation under underwater emergency conditions, while the air conditioning chiller condenser 4 has a large heat dissipation under surface conditions, they are connected in series based on the concept of "peak shaving and valley filling." Furthermore, the temperature of the circulating freshwater entering the battery distilled water cooler 2 cannot be too high, and the temperature rise of the circulating freshwater after flowing through the battery distilled water cooler 2 is low. Therefore, the flow sequence of the circulating freshwater is seawater-freshwater heat exchanger 5 → battery distilled water cooler 2 → air conditioning chiller condenser 4.

[0066] In traditional system configurations, seawater is first introduced into the desalination heat exchanger using a seawater pump, and then a freshwater circulation pump drives the freshwater cooling auxiliary equipment, inevitably leading to increased energy consumption and noise in underwater operating conditions. Submersibles operate in the deep sea for extended periods, where the seawater temperature is low. This invention employs an external cooling device 1 to fully utilize the low-temperature external seawater under underwater operating conditions, using natural cooling and avoiding the use of a seawater cooling pump 6. This eliminates the noise from the ocean currents under underwater operating conditions while also reducing energy consumption. In this invention, both sides of the battery distilled water cooler 2 and the air conditioning chiller condenser 4 are clean media, providing conditions for the use of microchannel heat exchanger technology. This allows for a 50% reduction in the original heat exchanger volume, making room for the addition of two seawater-freshwater heat exchangers 5.

[0067] like Figure 4 A schematic diagram of the existing general-purpose cooling system configuration for underwater vehicles. Figure 4 The reference numerals in the attached drawings are as follows: 1—side valve, 2—second ball valve, 3—seawater filter, 4—manual ball valve, 5—air conditioning seawater pump, 6—battery seawater cooling pump, 7—stop check valve, 8—battery distilled water cooler, 9—air conditioning chiller condenser; all components and / or equipment are connected by pipes.

[0068] The structural configuration in this embodiment is compared with the configuration of the general-purpose underwater vehicle cooling system in existing underwater vehicles, as shown in Table 1.

[0069] Table 1 Comparison of Cooling System Equipment Configuration between This Embodiment and Existing Systems

[0070]

[0071] As shown in Table 1, compared with the existing cooling system, the equipment volume in this embodiment will not only not increase, but the two air conditioning seawater pumps will be replaced by two freshwater circulation pipeline pumps, and the volume occupied by the equipment will actually be reduced. The original two sets of high-pressure seawater pipelines for auxiliary machine seawater cooling and battery seawater cooling will be replaced by one set of low-pressure freshwater circulation pipeline and one set of seawater cooling pipeline, which can reduce the volume of pipeline accessories accordingly.

[0072] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0073] Finally, it should be noted that the above 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 embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, 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 method of using an integrated water-cooling system for a submersible, characterized in that, The method is to provide an integrated water-cooling system for underwater vehicles; Under underwater conditions, the first freshwater circulation pump is started, driving the circulating freshwater into the external cooling device. The circulating freshwater exchanges heat with the seawater outside the submersible in the external cooling device. After the heat exchange, the circulating freshwater with a lower temperature enters the air conditioning chiller condenser and other freshwater cooling users to cool and exchange heat with them. After the heat exchange, the circulating freshwater with a higher temperature flows back to the external cooling device for cooling. This cycle is repeated to achieve heat exchange between the circulating freshwater and the external cooling seawater. Under surface conditions, the first freshwater circulation pump, the second freshwater circulation pump, and the seawater cooling pump are started. The freshwater circulation pump drives the circulating freshwater into the battery distilled water cooler. In the battery distilled water cooler, the circulating freshwater absorbs the heat transferred by the distilled water. The heated circulating freshwater enters the air conditioning chiller condenser for heat exchange. After passing through the air conditioning chiller condenser, the circulating freshwater temperature rises again and enters the seawater freshwater heat exchanger to exchange heat with the cooling seawater. After the heat exchange, the cooled circulating freshwater returns to the battery distilled water cooler. This cycle repeats continuously, transferring the heat from the battery distilled water cooler, the air conditioning chiller condenser, and other users to the cooling seawater via the circulating freshwater. The integrated water-cooling system for the submersible includes an external cooling device, an air conditioning chiller condenser, a seawater-freshwater heat exchanger, and a battery distilled water cooler. The external cooling device is located on the outside of the submersible; One side of the external cooling device is connected to the main water supply line, and the other side of the external cooling device is connected to the main return line. The main water supply line is connected to several first water supply branches and several second water supply branches; The first water supply branch is connected to the inlet of the cold source channel of the battery distilled water cooler, and the outlet of the cold source channel of the battery distilled water cooler is connected to the main return water branch through the first return water branch. The second water supply branch is connected to the cold source channel of the air conditioning chiller condenser; the outlet of the cold source channel of the air conditioning chiller condenser is connected to the inlet of the heat source channel of the seawater-freshwater heat exchanger through a connecting pipe, and the outlet of the heat source channel of the seawater-freshwater heat exchanger is connected to the main return water line through the second return water branch. The cold source channel inlet of the seawater-freshwater heat exchanger is connected to the seawater inlet pipeline, and a seawater cooling pump is installed on the seawater inlet pipeline. The main water supply pipeline includes a first water supply pipe section and a second water supply pipe section connected together, and a first freshwater circulation pump is provided between the first water supply pipe section and the second water supply pipe section. The main return water pipeline includes a first return water pipe section and a second return water pipe section connected together, and a second freshwater circulation pump is provided between the first return water pipe section and the second return water pipe section.

2. The method of using the integrated water-cooling system for underwater vehicles as described in claim 1, characterized in that, Under water surface conditions, the circulating fresh water absorbs the heat transferred by the distilled water in the battery distilled water cooler, and the temperature rises by 0.5~1℃.

3. The method of using the integrated water-cooling system for underwater vehicles as described in claim 1, characterized in that, The external cooling device does not work when operating on water.

4. The method of using the integrated water-cooling system for underwater vehicles as described in claim 1, characterized in that, The cold source channel outlet of the seawater-freshwater heat exchanger is connected to the seawater outlet pipeline.

5. The method of using the integrated water-cooling system for underwater vehicles as described in claim 4, characterized in that, Each of the first water supply branches is connected to the first water supply pipeline; each of the second water supply branches is connected to the second water supply pipeline.

6. The method of using the integrated water-cooling system for underwater vehicles as described in claim 5, characterized in that, Each first return water branch is connected to the first return water pipe section; each second return water branch is connected to the second return water pipe section.

7. The method of using the integrated water-cooling system for a submarine as described in claim 5, characterized in that, It is equipped with two sets of battery distilled water coolers, two sets of air conditioning chiller condensers, two seawater and freshwater heat exchangers, two first water supply branches, two first return water branches, two second water supply branches, and two second return water branches.

8. The method of using the integrated water-cooling system for a submarine as described in claim 5, characterized in that, Valves are installed on the main water supply line and the main water return line.

9. The method of using the integrated water-cooling system for a submarine as described in claim 5, characterized in that, Valves are installed on the first return water branch and the second supply water branch.

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