Vacuum oil filling device for liquid towed array

Abstract

The utility model relates to the technical field of optical fiber hydrophone manufacturing, and provides a vacuum oil filling device for a liquid towed array, which comprises an oil filling system, an optical fiber hydrophone array and a first vacuum-pumping system, and is characterized in that the oil filling system is suitable for providing a liquid filling agent; the optical fiber hydrophone array is provided with a first oil filling nozzle and a second oil filling nozzle which are communicated with an inner cavity of the optical fiber hydrophone array, and the oil filling system is communicated with the first oil filling nozzle so as to fill a liquid filling agent into the inner cavity through the first oil filling nozzle; the first vacuumizing system is communicated with the second oil filling nozzle, and the first vacuumizing system is suitable for vacuumizing the inner cavity. The influence of bubbles on the performance of the optical fiber hydrophone is reduced, and efficient collection of signal data is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber hydrophone manufacturing, in particular to a vacuum oil filling device for a liquid towed array. Background Art

[0002] A fiber-optic hydrophone is an underwater acoustic signal sensor based on optical fiber and optoelectronics technology. It uses highly sensitive optical coherence detection to convert underwater acoustic vibrations into optical signals, which are then transmitted via optical fiber to a signal processing system for extraction.

[0003] In the related technical field, when an existing fiber optic hydrophone array is filled with oil, bubbles may be filled into the fiber optic hydrophone array along with the filling medium. The presence of bubbles in the fiber optic hydrophone array will affect the performance of the fiber optic hydrophone array. Utility Model Content

[0004] The utility model provides a vacuum oil filling device for a liquid towed array, which is used to solve the defect in the prior art that when the fiber optic hydrophone array is filled with oil, bubbles may be filled into the fiber optic hydrophone array along with the oil filling medium, thereby affecting the performance of the fiber optic hydrophone array. The utility model reduces the impact of bubbles on the performance of the fiber optic hydrophone and ensures the efficient collection of signal data.

[0005] The utility model provides a vacuum oil filling device for a liquid drag array, comprising:

[0006] an oil filling system adapted to provide a liquid filler;

[0007] A fiber optic hydrophone array having a first oil filling nozzle and a second oil filling nozzle in communication with an inner cavity of the fiber optic hydrophone array, wherein the oil filling system is in communication with the first oil filling nozzle to fill the inner cavity with a liquid filler through the first oil filling nozzle;

[0008] A first vacuum pumping system is connected to the second oil filling nozzle, and the first vacuum pumping system is suitable for vacuuming the inner cavity.

[0009] According to the utility model, a vacuum oil filling device for a liquid towed array is provided. The oil filling system includes an oil filling device, an oil pump and an oil filling pipe. The oil filling device is suitable for storing the liquid filler. The oil filling pipe is suitable for connecting the oil filling device and the first oil filling nozzle. The oil pump is suitable for pumping the liquid filler in the oil filling device to the first oil filling nozzle through the oil filling pipe.

[0010] According to a vacuum oil filling device for a liquid towed array provided by the utility model, the oil filling system further includes an oil outlet valve, which is arranged on the oil filling pipe and is suitable for controlling the on-off of the oil filling pipe.

[0011] According to a vacuum oil filling device for a liquid towed array provided by the present invention, the first vacuum pumping system includes a first vacuum pump and a first air pipe, and the first vacuum pump is connected to the second oil filling nozzle through the first air pipe.

[0012] According to a vacuum oil filling device for a liquid towed array provided by the utility model, the first vacuum pumping system includes a first suction bottle, which is arranged on the first air pipe and is suitable for performing gas-liquid separation on the gas-liquid mixture pumped by the first air pipe.

[0013] According to a vacuum oil filling device for a liquid towed array provided by the utility model, the first vacuum pumping system includes a first switch valve, which is arranged on the first air pipe and is suitable for controlling the on-off of the first air pipe.

[0014] According to the utility model, a vacuum oil filling device for a liquid towed array is provided. The vacuum oil filling device for a liquid towed array includes a second vacuum pumping system, which is connected to the oil filling system and is suitable for vacuuming the oil filling system.

[0015] According to a vacuum oil filling device for a liquid towed array provided by the present invention, the second vacuum pumping system includes a second vacuum pump and a second air pipe, and the second vacuum pump is connected to the oil filling system through the second air pipe.

[0016] According to a vacuum oil filling device for a liquid towed array provided by the utility model, the second vacuum pumping system includes a second suction bottle, which is arranged on the second air pipe and is suitable for performing gas-liquid separation on the gas-liquid mixture pumped by the second air pipe.

[0017] According to a vacuum oil filling device for a liquid towed array provided by the utility model, an air outlet is provided on the oil filling device, the air outlet is communicated with the oil storage chamber of the oil filling device, an air valve is provided on the air outlet, and the air valve is suitable for controlling the opening and closing of the air outlet.

[0018] The vacuum oil filling device for a liquid towed array provided by the utility model exhausts the air in the fiber optic hydrophone array by setting a first vacuum pumping system, so that the process of filling the liquid filler is carried out in a vacuum state. The liquid filler in the entire fiber optic hydrophone array is filled with the oil filling system, so that there are no bubbles in the liquid filler in the fiber optic hydrophone array, thereby reducing the impact of bubbles on the performance of the fiber optic hydrophone and ensuring the efficient collection of signal data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 The utility model provides a schematic diagram of the connection between the oil filling system and the optical fiber hydrophone array in the vacuum oil filling device for the liquid towed array.

[0021] Figure 2 The utility model provides a schematic diagram of the connection between the optical fiber hydrophone array and the first vacuum pumping system in the vacuum oil filling device for the liquid towed array.

[0022] Figure 3 It is a connection diagram of the oil filling system and the second vacuum pumping system in the vacuum oil filling device for the liquid towed array provided by the utility model.

[0023] Reference numerals:

[0024] 10. Vacuum oil filling device for liquid towed array;

[0025] 100, oil filling system; 110, oil filling device; 111, air outlet; 120, oil pump; 130, oil filling pipe; 140, oil outlet valve; 150, air valve; 160, second on / off valve; 170, pressure adjustment knob; 180, oil pump switch;

[0026] 200, fiber optic hydrophone array; 210, first oil filling nozzle; 220, second oil filling nozzle;

[0027] 300, first vacuum system; 310, first vacuum pump; 320, first air pipe; 330, first filter bottle; 340, first switch valve;

[0028] 400, second vacuum pumping system; 410, second vacuum pump; 420, second air pipe. DETAILED DESCRIPTION

[0029] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0032] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0034] The following combination Figures 1 to 3 , the vacuum oil filling device for the liquid towed array provided by the embodiment of the present invention is described in detail through specific embodiments and application scenarios.

[0035] In the utility model embodiment, refer to Figures 1 to 3 A vacuum oil filling device 10 for a liquid towed array is provided, which includes an oil filling system 100, a fiber optic hydrophone array 200, and a first vacuum pumping system 300. The oil filling system 100 is suitable for providing a liquid filler. The fiber optic hydrophone array 200 has a first oil filling nozzle 210 and a second oil filling nozzle 220 connected to its own inner cavity. The oil filling system 100 is connected to the first oil filling nozzle 210 to inject the liquid filler into the inner cavity through the first oil filling nozzle 210. The first vacuum pumping system 300 is connected to the second oil filling nozzle 220 and is suitable for vacuuming the inner cavity.

[0036] The oil filling system 100 is responsible for storing and supplying liquid filler. This liquid filler primarily protects the fiber optic hydrophone from external environmental influences (such as changes in seawater pressure) and also serves as a sound wave transmission medium, helping to improve signal transmission quality. The oil filling system 100 delivers the liquid filler into the inner cavity of the fiber optic hydrophone array 200. The oil filling system 100 may include components such as a liquid filler storage container, a delivery pipeline, a control valve, and an oil pump 120.

[0037] The oil filling system 100 is connected to the first oil filling nozzle 210 of the fiber optic hydrophone array 200 . When the control valve is opened, the oil filling system 100 can deliver liquid filler into the inner cavity of the fiber optic hydrophone array 200 through the oil pump 120 .

[0038] The fiber optic hydrophone array 200 is used to detect underwater acoustic signals and convert them into optical signals for transmission and processing. The liquid filler helps improve its sensitivity and stability and reduces the impact of the external environment on the fiber optic hydrophone.

[0039] The fiber optic hydrophone array 200 includes a fiber optic hydrophone unit and a first oil filling nozzle 210 and a second oil filling nozzle 220 communicating with the inner cavity thereof. The first oil filling nozzle 210 is used to introduce liquid filler, and the second oil filling nozzle 220 is used to connect to the first vacuum system 300 for vacuuming.

[0040] The first oil filling nozzle 210 serves as an inlet for the liquid filler to enter the inner cavity of the fiber optic hydrophone array 200 and is connected to the oil filling system 100 .

[0041] Second oil filling nozzle 220 serves as a connection interface between the inner cavity of fiber-optic hydrophone array 200 and first vacuum system 300, evacuating the inner cavity before oil filling. The vacuum system connected to second oil filling nozzle 220 completely removes air and any bubbles from the inner cavity, providing a vacuum environment for subsequent oil filling operations.

[0042] The first vacuum system 300, which includes components such as a vacuum pump, a vacuum gauge, and valves, evacuates the inner cavity of the fiber optic hydrophone array 200, creating an air- and bubble-free vacuum environment. Oil filling within this vacuum environment significantly reduces bubble formation, ensuring that the liquid filler evenly and bubble-free fills the entire inner cavity, thereby improving the performance stability and signal acquisition efficiency of the fiber optic hydrophone.

[0043] In the present application, the air in the fiber optic hydrophone array 200 is exhausted by setting a first vacuum pumping system 300, so that the process of filling the liquid filler is carried out in a vacuum state. The liquid filler in the entire fiber optic hydrophone array 200 is filled with the oil filling system 100, so that there are no bubbles in the liquid filler in the fiber optic hydrophone array 200, thereby reducing the impact of bubbles on the performance of the fiber optic hydrophone and ensuring efficient acquisition of signal data.

[0044] Reference Figure 1 and Figure 3 In some embodiments, the oil filling system 100 includes an oil filling device 110, an oil pump 120, and an oil filling pipe 130. The oil filling device 110 is adapted to store liquid filling agent. The oil filling pipe 130 is adapted to connect the oil filling device 110 and the first oil filling nozzle 210. The oil pump 120 is adapted to pump the liquid filling agent in the oil filling device 110 to the first oil filling nozzle 210 through the oil filling pipe 130.

[0045] It is understandable that the oil filling device 110 is used to store the liquid filler used to fill the inner cavity of the fiber optic hydrophone array 200, and provides a stable supply source during the filling process.

[0046] The oil filling device 110 is usually a closed storage tank with an inlet and outlet for adding and discharging the filler, and can also be equipped with an observation window or a sensor to monitor the liquid level.

[0047] The oil pump 120 is adapted to pump the liquid filler within the oil filling device 110 through the oil filling pipe 130 to the first oil filling nozzle 210. The oil pump 120 is the power source that drives the liquid filler flow, ensuring smooth transfer of the liquid filler from the oil filling device 110 to the inner cavity of the fiber optic hydrophone array 200. The oil pump 120 can be an electric or other type of fluid delivery device, equipped with a liquid inlet and outlet, as well as an oil pump switch 120. The oil pump switch 120 can be integrated with the oil filling device 110 to control its start and stop.

[0048] The oil filling pipe 130 is a channel connecting the oil filling device 110 and the fiber optic hydrophone array 200 , ensuring that the liquid filler can be smoothly transferred from the storage tank to the fiber optic hydrophone array 200 .

[0049] One end of the oil filling pipe 130 is connected to the liquid outlet of the oil filling device 110, and the other end is connected to the first oil filling nozzle 210 of the fiber optic hydrophone array 200. When the oil pump 120 is started, the liquid filler flows into the inner cavity of the fiber optic hydrophone array 200 through the oil filling pipe 130.

[0050] In some embodiments, the oil filling tube 130 may be provided with a plurality of connection ports at the end thereof for filling the plurality of fiber optic hydrophone arrays 200 with oil.

[0051] Reference Figure 1 and Figure 3 In some embodiments, the oil filling system 100 further includes an oil outlet valve 140 . The oil outlet valve 140 is disposed on the oil filling pipe 130 . The oil outlet valve 140 is adapted to control the on / off state of the oil filling pipe 130 .

[0052] It will be appreciated that in this embodiment, the oil outlet valve 140 is disposed on the oil filling pipe 130 , and its primary function is to control the opening and closing of the oil filling pipe 130 . During the oil filling process, opening the oil outlet valve 140 allows liquid filler to flow from the oil filling device 110 through the oil filling pipe 130 and reach the first oil filling nozzle 210 of the fiber optic hydrophone array 200 . When oil filling needs to be stopped or maintenance is required, the oil outlet valve 140 is closed, cutting off the flow path of the liquid filler, thereby improving system safety.

[0053] Reference Figure 2 In some embodiments, the first vacuum system 300 includes a first vacuum pump 310 and a first air pipe 320 , and the first vacuum pump 310 is connected to the second oil filling nozzle 220 through the first air pipe 320 .

[0054] It is understood that the first vacuum pump 310 is adapted to provide vacuum power for extracting air from the interior of the fiber optic hydrophone array 200. The first vacuum pump 310 is connected to the second oil filling nozzle 220 of the fiber optic hydrophone array 200 via a first air pipe 320, thereby extracting air from the interior of the fiber optic hydrophone array 200 to create a vacuum environment.

[0055] The first vacuum pump 310 can be a motor-driven pump capable of generating sufficient negative pressure to extract air. When the first vacuum pump 310 is activated, it draws air from the second oil filling nozzle 220 of the fiber optic hydrophone array 200 through the first air pipe 320 to create a vacuum environment.

[0056] The first air tube 320 serves as a passage between the vacuum pump and the fiber optic hydrophone array 200, ensuring that air can be extracted from the fiber optic hydrophone array 200. One end of the first air tube 320 is connected to the output port of the first vacuum pump 310, and the other end is connected to the second oil filling nozzle 220 of the fiber optic hydrophone array 200. When the vacuum pump is activated, the first air tube 320 guides the air inside the fiber optic hydrophone array 200 to the outside.

[0057] In some embodiments, a plurality of connection ports may be provided at the end of the first air tube 320 for vacuuming the plurality of fiber optic hydrophone arrays 200 .

[0058] Reference Figure 2 In some embodiments, the first vacuum system 300 includes a first suction bottle 330, which is arranged on the first air pipe 320, and the first suction bottle 330 is suitable for gas-liquid separation of the gas-liquid mixture pumped by the first air pipe 320.

[0059] It will be appreciated that in this embodiment, the first suction bottle 330 is used to separate the gas-liquid mixture pumped by the first air pipe 320. During the vacuuming process, a small amount of liquid filler may be pumped out of the cavity of the fiber optic hydrophone array 200 and mix with air to form a gas-liquid mixture. The function of the first suction bottle 330 is to separate this mixture, preventing liquid from entering the vacuum pump and protecting the equipment from damage.

[0060] The first suction filtration bottle 330 is usually a transparent glass or plastic bottle with a filtering device or a partition plate inside to separate the gas-liquid mixture. The suction filtration bottle has two interfaces, one connected to the first air pipe 320 and the other connected to the vacuum pump.

[0061] When the first vacuum pump 310 is started, the gas-liquid mixture enters the first suction bottle 330 through the first air pipe 320 and is separated in the bottle. The gas is continuously extracted while the liquid remains in the bottle.

[0062] Reference Figure 2 In some embodiments, the first vacuum system 300 includes a first switch valve 340 , which is disposed on the first air pipe 320 , and the first switch valve 340 is adapted to control the on / off state of the first air pipe 320 .

[0063] It is understandable that the first on-off valve 340 is used to control the opening and closing of the airflow during the vacuuming process, so as to better manage the time and degree of vacuuming.

[0064] The first switch valve 340 is generally a manually or automatically controlled valve installed on the first air pipe 320 and located between the second oil filling nozzle 220 of the fiber optic hydrophone array 200 and the first suction bottle 330 or the first vacuum pump 310 .

[0065] The airflow is controlled by opening or closing the first switch valve 340. During the vacuuming process, the first switch valve 340 is opened to allow airflow through the first air pipe 320; when vacuuming is not required, the first switch valve 340 is closed to cut off the airflow.

[0066] Reference Figure 3 In some embodiments, the vacuum oil filling device 10 for the liquid towed array includes a second vacuum pumping system 400 , which is connected to the oil filling system 100 , and the second vacuum pumping system 400 is suitable for vacuuming the oil filling system 100 .

[0067] It will be appreciated that vacuuming the oil filling system 100 using the second vacuuming system 400 ensures that all air within the oil filling system 100 is removed, thereby reducing the number of bubbles introduced into the inner cavity of the fiber optic hydrophone array 200 during the filling process. Furthermore, the fluidity of the liquid filler is improved, allowing it to more easily and evenly enter the interior of the fiber optic hydrophone array 200.

[0068] Reference Figure 3 In some embodiments, the second vacuum system 400 includes a second vacuum pump 410 and a second air pipe 420 , and the second vacuum pump 410 is connected to the oil filling system 100 through the second air pipe 420 .

[0069] It is understood that the second vacuum pump 410 is adapted to provide vacuum power for extracting air from the oil filling system 100. The second vacuum pump 410 can be used to extract air from the oil filling system 100, creating a vacuum environment and reducing bubbles in the liquid filler.

[0070] The second vacuum pump 410 is typically a motor-driven pump capable of generating sufficient negative pressure to extract air.

[0071] The second air pipe 420 serves as a passage between the vacuum pump and the oil filling system 100, ensuring that air can be extracted from the oil filling system 100. One end of the second air pipe 420 is connected to the output port of the second vacuum pump 410, and the other end is connected to the exhaust port of the oil filling system 100. When the vacuum pump is activated, the second air pipe 420 guides the air inside the oil filling system 100 to the outside.

[0072] In some embodiments, the second vacuum system 400 includes a second suction bottle, which is arranged on the second air pipe 420 and is suitable for performing gas-liquid separation on the gas-liquid mixture pumped by the second air pipe 420.

[0073] It is understood that during the vacuuming process of the oil filling system 100, a small amount of liquid filler may be pumped out and mixed with air to form a gas-liquid mixture. The second suction bottle is used to separate this mixture and prevent the liquid from entering the second vacuum pump 410, thereby protecting the equipment from damage.

[0074] The second filtration bottle can be a transparent glass or plastic bottle equipped with a filter or partition to separate the gas-liquid mixture. The second filtration bottle has two interfaces: one connected to the second air pipe 420 and the other connected to the second vacuum pump 410. When the second vacuum pump 410 is activated, the gas-liquid mixture enters the second filtration bottle through the second air pipe 420. Within the bottle, the gas is further extracted while the liquid remains.

[0075] Reference Figure 3 In some embodiments, an air outlet 111 is provided on the oil filling device 110, and the air outlet 111 is connected to the oil storage chamber of the oil filling device 110. An air valve 150 is provided on the air outlet 111, and the air valve 150 is suitable for controlling the opening and closing of the air outlet 111.

[0076] It is understood that the function of the vent hole 111 is to ensure that the pressure inside the oil filling device 110 is properly regulated during the vacuuming and oil filling process. By controlling the opening and closing of the vent hole 111, the pressure changes inside the oil filling device 110 can be better managed.

[0077] The air valve 150 allows the user to precisely control the state of the air outlet 111 during the vacuuming and oil filling processes, ensuring that the air pressure inside the oil filling device 110 is effectively managed.

[0078] Specifically, a pressure regulating knob 170 may be further provided on the oil filling device 110 , and the opening of the air valve 150 may be adjusted by the pressure regulating knob 170 to adjust the internal pressure of the oil filling device 110 .

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A vacuum oil filling device for a liquid drag array, characterized in that: include: an oil filling system adapted to provide a liquid filler; A fiber optic hydrophone array having a first oil filling nozzle and a second oil filling nozzle in communication with an inner cavity of the fiber optic hydrophone array, wherein the oil filling system is in communication with the first oil filling nozzle to fill the inner cavity with a liquid filler through the first oil filling nozzle; A first vacuum pumping system is connected to the second oil filling nozzle, and the first vacuum pumping system is suitable for vacuuming the inner cavity.

2. The vacuum oil filling device for liquid towed array according to claim 1, characterized in that: The oil filling system includes an oil filling device, an oil pump and an oil filling pipe. The oil filling device is suitable for storing the liquid filler. The oil filling pipe is suitable for connecting the oil filling device and the first oil filling nozzle. The oil pump is suitable for pumping the liquid filler in the oil filling device to the first oil filling nozzle through the oil filling pipe.

3. The vacuum oil filling device for liquid towed array according to claim 2, characterized in that: The oil filling system further comprises an oil outlet valve, which is arranged on the oil filling pipe and is suitable for controlling the on-off of the oil filling pipe.

4. The vacuum oil filling device for liquid towed array according to claim 1, characterized in that: The first vacuum pumping system includes a first vacuum pump and a first air pipe, and the first vacuum pump is connected to the second oil filling nozzle through the first air pipe.

5. The vacuum oil filling device for liquid towed array according to claim 4, characterized in that: The first vacuum pumping system includes a first suction filter bottle, which is arranged on the first air pipe and is suitable for performing gas-liquid separation on the gas-liquid mixture pumped by the first air pipe.

6. The vacuum oil filling device for liquid towed array according to claim 5, characterized in that: The first vacuum pumping system includes a first switch valve, which is arranged on the first air pipe and is suitable for controlling the opening and closing of the first air pipe.

7. The vacuum oil filling device for a liquid towed array according to any one of claims 1 to 6, characterized in that: The vacuum oil filling device for the liquid towed array includes a second vacuum pumping system, which is connected to the oil filling system and is suitable for vacuuming the oil filling system.

8. The vacuum oil filling device for liquid towed array according to claim 7, characterized in that: The second vacuum pumping system includes a second vacuum pump and a second air pipe, and the second vacuum pump is connected to the oil filling system through the second air pipe.

9. The vacuum oil filling device for liquid towed array according to claim 8, characterized in that: The second vacuum pumping system includes a second suction filter bottle, which is arranged on the second air pipe and is suitable for performing gas-liquid separation on the gas-liquid mixture pumped by the second air pipe.

10. The vacuum oil filling device for liquid towed array according to claim 8, characterized in that: The oil filling device is provided with an air outlet, the air outlet is communicated with the oil storage chamber of the oil filling device, and an air valve is provided on the air outlet, and the air valve is suitable for controlling the opening and closing of the air outlet.

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