Submersible pumps and ships

Abstract

This disclosure provides a submersible pump and a vessel, belonging to the field of marine technology. The submersible pump includes a pump assembly and a tank cleaning assembly. The pump assembly includes a pump body and a cargo pipe, the pump body being connected to the cargo pipe. The first port of the cargo pipe is located at the bottom of the pump body, and the second port of the cargo pipe is located at the top of the pump body. The tank cleaning assembly includes a buffer tank, a cleaning pipe, a transfer pipe, an air supply pipe, and an air source device. The buffer tank is connected to the middle of the cargo pipe. The first port of the cleaning pipe is close to the first port of the cargo pipe, and the second port of the cleaning pipe is connected to the buffer tank. The first port of the transfer pipe is connected to the buffer tank, and the second port of the transfer pipe is connected to the portion of the cargo pipe near its own second port. The first port of the air supply pipe is connected to the buffer tank, and the second port of the air supply pipe is connected to the air source device. The air source device is connected to the pump body and is used to draw in or blow air into the buffer tank through the air supply pipe. This disclosure can improve the tank cleaning effect.

Description

Technical Field

[0001] This disclosure pertains to the field of marine technology, and particularly relates to a submersible pump and a vessel. Background Technology

[0002] A liquid cargo ship is a type of vessel used to transport various liquid cargoes. A submersible pump is a device used to pump liquid cargoes and can be applied to liquid cargo ships.

[0003] In related technologies, liquid cargo is stored in the cargo tanks of ships. After the submersible pumps have unloaded the liquid cargo, they need to use a tank cleaning device to further clean the cargo tanks to remove any residual liquid cargo. This complies with the requirements of the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk, which stipulates that after the main cargo oil pumps of chemical tankers have completed unloading and tank cleaning, the residual liquid cargo is less than 75L.

[0004] However, for large ships, the depth of their liquid cargo tanks is relatively large (greater than 7 meters), and the suction power of the tank sweeping devices in related technologies is insufficient to transport the residual liquid cargo to the deck, resulting in failure to meet the requirements of the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk. Summary of the Invention

[0005] This disclosure provides a submersible pump and a vessel that can improve tank cleaning efficiency. The technical solution is as follows:

[0006] In a first aspect, embodiments of this disclosure provide a submersible pump for use in a ship, the submersible pump comprising: a pump assembly and a tank cleaning assembly;

[0007] The pump assembly includes a pump body and a liquid cargo pipe, the pump body being connected to the liquid cargo pipe, a first port of the liquid cargo pipe being located at the bottom of the pump body, and a second port of the liquid cargo pipe being located at the top of the pump body;

[0008] The tank cleaning assembly includes a buffer tank, a cleaning pipe, a transmission pipe, a gas supply pipe, and a gas source device. The buffer tank is connected to the middle of the liquid cargo pipe. The first port of the cleaning pipe is close to the first port of the liquid cargo pipe, and the second port of the cleaning pipe is connected to the buffer tank. The first port of the transmission pipe is connected to the buffer tank, and the second port of the transmission pipe is connected to the portion of the liquid cargo pipe near its own second port. The first port of the gas supply pipe is connected to the buffer tank, and the second port of the gas supply pipe is connected to the gas source device. The gas source device is connected to the pump body and is used to draw in or blow air into the buffer tank through the gas supply pipe.

[0009] In one implementation of this disclosure, the buffer tank has an insertion port;

[0010] The buffer tank is fitted outside the liquid cargo pipe, and the wall of the insertion hole is connected to the outer wall of the liquid cargo pipe.

[0011] In one implementation of this disclosure, in the vertical direction perpendicular to the horizontal plane, the distance between the top and bottom of the buffer tank is 0.8 to 1.2 meters, the distance between the top of the buffer tank and the first port of the cleaning pipe is less than 5 meters, and the distance between the bottom of the buffer tank and the first port of the cleaning pipe is less than 2 meters.

[0012] In one implementation of this disclosure, the gas source device includes a vacuum ejector, a three-way valve, and a gas source;

[0013] The first inlet of the vacuum ejector is connected to the first port of the three-way valve, and the second inlet of the vacuum ejector is connected to the second port of the gas supply pipe;

[0014] The second port of the three-way valve is connected to the second port of the gas supply pipe, and the third port of the three-way valve is connected to the gas source.

[0015] In one implementation of this disclosure, the tank cleaning assembly further includes a gas shut-off valve;

[0016] The gas shut-off valve is installed in the gas supply pipe, and the gas shut-off valve is located between the second inlet of the vacuum ejector and the buffer tank.

[0017] In one implementation of this disclosure, the tank cleaning assembly further includes a first liquid cargo shut-off valve;

[0018] The first liquid cargo shut-off valve is disposed in the transmission pipe, and the first liquid cargo shut-off valve is located between the liquid cargo pipe and the buffer tank.

[0019] In one implementation of this disclosure, the tank cleaning assembly further includes a first one-way valve;

[0020] The first one-way valve is located between the first port and the second port of the cleaning pipe.

[0021] In one implementation of this disclosure, the tank cleaning assembly further includes a second one-way valve;

[0022] The second one-way valve is disposed between the first port and the second port of the transmission pipe.

[0023] In one implementation of this disclosure, the pump assembly further includes a second liquid shut-off valve;

[0024] The second liquid cargo shut-off valve is disposed inside the liquid cargo pipe and near the second port of the liquid cargo pipe. The second liquid cargo shut-off valve is located between the first port of the liquid cargo pipe and the second port of the transmission pipe.

[0025] Secondly, embodiments of this disclosure provide a vessel including the submersible pump described in the first aspect.

[0026] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0027] When pumping liquid cargo, the pump works, allowing the liquid cargo in the cargo tank to enter through the first port of the cargo pipe and exit to the outside through the second port of the cargo pipe.

[0028] After the liquid cargo is pumped out, the tank cleaning operation begins. The pump stops, and the air supply unit draws air into the buffer tank through the air supply pipe, allowing the liquid cargo in the tank to enter through the first port of the cleaning pipe and exit through the second port into the buffer tank. When the liquid cargo in the buffer tank accumulates to a certain level, the air supply unit blows air into the buffer tank through the air supply pipe, allowing the liquid cargo in the buffer tank to enter through the first port of the transfer pipe and exit through the second port into the liquid cargo pipe, thus exiting to the outside through the liquid cargo pipe.

[0029] During tank cleaning, the liquid cargo in the tanks is temporarily stored in a buffer tank by a gas supply device, and then discharged to the outside by the buffer tank by the same device. This two-step cleaning process allows submersible pumps to be used in deep cargo tanks, and for large ships, it also meets the requirements of the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the submersible pump provided in the embodiments of this disclosure;

[0032] Figure 2 This is an assembly diagram of the buffer tank provided in an embodiment of this disclosure;

[0033] Figure 3 This is an assembly diagram of the buffer tank provided in an embodiment of this disclosure.

[0034] The symbols in the diagram represent the following meanings:

[0035] 10. Pump assembly;

[0036] 110. Pump body; 120. Liquid cargo pipe; 121. Vertical section; 122. Horizontal section; 130. Second liquid cargo shut-off valve;

[0037] 20. Tank cleaning components;

[0038] 210. Buffer tank; 211. Socket;

[0039] 220. Tank cleaning pipe;

[0040] 230. Transmission pipe;

[0041] 240. Gas pipeline;

[0042] 250. Air supply device; 251. Vacuum ejector; 252. Three-way valve; 253. Air source;

[0043] 260. Gas shut-off valve;

[0044] 270. First liquid cargo shut-off valve;

[0045] 280. First check valve;

[0046] 290. Second check valve;

[0047] 30. Mounting bracket;

[0048] 100, cargo tank; 200, deck; 300, cargo well.

[0049] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0051] This disclosure provides a submersible pump that can be used in ships. Figure 1 This is a schematic diagram of the structure of a submersible pump provided in an embodiment of this disclosure. See also: Figure 1 In this embodiment, the submersible pump includes a pump assembly 10 and a tank cleaning assembly 20.

[0052] The pump assembly 10 includes a pump body 110 and a liquid cargo pipe 120. The pump body 110 is connected to the liquid cargo pipe 120. The first port of the liquid cargo pipe 120 is located at the bottom of the pump body 110, and the second port of the liquid cargo pipe 120 is located at the top of the pump body 110. The tank cleaning assembly 20 includes a buffer tank 210, a tank cleaning pipe 220, a transmission pipe 230, an air supply pipe 240, and an air source device 250. The buffer tank 210 is connected to the middle of the liquid cargo pipe 120. The first port of the tank cleaning pipe 220 is close to the first port of the liquid cargo pipe 120, and the second port of the tank cleaning pipe 220 is connected to the buffer tank 210. The first port of the transmission pipe 230 is connected to the buffer tank 210, and the second port of the transmission pipe 230 is connected to the part of the liquid cargo pipe 120 near its own second port. The first port of the air supply pipe 240 is connected to the buffer tank 210, and the second port of the air supply pipe 240 is connected to the air source device 250. The air source device 250 is connected to the pump body 110 and is used to draw air or blow air into the buffer tank 210 through the air supply pipe 240.

[0053] When pumping liquid cargo, the pump body 110 works, providing power for the liquid cargo pipe 120 to draw in liquid cargo, so that the liquid cargo in the liquid cargo tank enters through the first port of the liquid cargo pipe 120 and is output to the outside through the second port of the liquid cargo pipe 120.

[0054] After the liquid cargo is pumped, the tank cleaning operation begins. Pump 110 stops, and the air source device 250 draws air into the buffer tank 210 through the air supply pipe 240. This allows the liquid cargo in the tank to enter through the first port of the cleaning pipe 220 and exit through the second port of the cleaning pipe 220 into the buffer tank 210. When the liquid cargo in the buffer tank 210 accumulates to a certain level, the air source device 250 blows air into the buffer tank 210 through the air supply pipe 240. This allows the liquid cargo in the buffer tank 210 to enter through the first port of the transfer pipe 230 and exit through the second port of the transfer pipe 230 into the liquid cargo pipe 120, from which it is then discharged to the outside.

[0055] During the tank cleaning process, the liquid cargo in the cargo tank is temporarily stored in the buffer tank 210 under the action of the gas source device 250, and then discharged to the outside through the buffer tank 210 under the action of the gas source device 250. In this way, the tank cleaning is carried out in two steps, which makes the submersible pump adaptable to the deep cargo tanks. For the tank cleaning of large ships, it can also meet the requirements of the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk.

[0056] Figure 2 This is an assembly diagram of buffer tank 210, combined with... Figure 2 In this embodiment, the buffer tank 210 has an insertion hole 211. The buffer tank 210 is sleeved outside the liquid cargo pipe 120, and the wall of the insertion hole 211 is connected to the outer wall of the liquid cargo pipe 120.

[0057] In the above implementation, the insertion hole 211 provides a accommodating space for the liquid cargo pipe 120, which is inserted into the insertion hole 211. The connection between the liquid cargo pipe 120 and the hole wall of the insertion hole 211 is achieved through the connection between the liquid cargo pipe 120 and the buffer tank 210. Placing the buffer tank 210 on the liquid cargo pipe 120 ensures the compact structure of the submersible pump and provides stable support for the buffer tank 210, preventing unnecessary shaking of the buffer tank 210.

[0058] Figure 3 This is an assembly diagram of buffer tank 210. Figure 3 for Figure 2 The bird's-eye view, combined with Figure 3 For example, the buffer tank 210 is a hollow cylindrical structure, and the insertion hole 211 is the hollow part of the buffer tank 210. The buffer tank 210 is coaxially sleeved outside the liquid cargo pipe 120.

[0059] In other embodiments, the buffer tank 210 may not have an inner wall (the wall of the insertion hole 211), but instead uses the outer wall of the liquid cargo pipe 120 as its inner wall, thus forming a sealed container for holding liquid cargo. This design effectively reduces the weight of the buffer tank 210, thereby reducing the load on the liquid cargo pipe 120.

[0060] Of course, the buffer tank 210 can also be other shapes of structural components, such as square, etc., and this disclosure does not limit it.

[0061] In other embodiments, the buffer tank 210 does not have an insertion port 211, and the outer wall of the buffer tank 210 is connected to the outer wall of the liquid cargo pipe 120.

[0062] In the above implementation, the connection between the buffer tank 210 and the liquid cargo pipe 120 is simpler, reducing the assembly difficulty of the buffer tank 210.

[0063] When the outer wall of the buffer tank 210 is connected to the outer wall of the liquid cargo pipe 120, in order to ensure the reliability of the connection between the two, a support frame is provided between the buffer tank 210 and the liquid cargo pipe 120. The support frame is located at the angle between the outer wall of the buffer tank 210 and the outer wall of the liquid cargo pipe 120, and is connected to the buffer tank 210 and the liquid cargo pipe 120 respectively.

[0064] For example, the buffer tank 210 and the liquid cargo pipe 120 are welded together.

[0065] The connection between the buffer tank 210 and the liquid cargo pipe 120 is made by welding, which ensures the reliability of the connection.

[0066] See you again Figure 1In this embodiment, in the vertical direction perpendicular to the horizontal plane, the distance between the top and bottom of the buffer tank 210 is 0.8 to 1.2 meters, the distance between the top of the buffer tank 210 and the first port of the cleaning pipe 220 is less than 5 meters, and the distance between the bottom of the buffer tank 210 and the first port of the cleaning pipe 220 is less than 2 meters.

[0067] In the above implementation, after the submersible pump is installed, it is vertically arranged perpendicular to the horizontal plane. In the vertical direction, the distance between the top and bottom of the buffer tank 210 is 0.8 to 1.2 meters, that is, the height of the buffer tank 210 is 0.8 to 1.2 meters. This ensures the volume of the buffer tank 210 while reducing the load on the cargo pipe 120. Furthermore, this design of the distance between the top of the buffer tank 210 and the first port of the cleaning pipe 220, as well as the distance between the bottom of the buffer tank 210 and the first port of the cleaning pipe 220, facilitates the full intake of residual cargo into the buffer tank 210, and the lower position of the buffer tank 210 makes maintenance easier.

[0068] As mentioned above, the gas source device 250 provides power to the liquid cargo intake buffer tank 210 and the liquid cargo output buffer tank 210. The gas source device 250 is described below.

[0069] See also Figure 1 In this embodiment, the gas source device 250 includes a vacuum ejector 251, a three-way valve 252, and a gas source 253.

[0070] The first inlet of the vacuum ejector 251 is connected to the first port of the three-way valve 252, and the second inlet of the vacuum ejector 251 is connected to the second port of the gas supply pipe 240. The second port of the three-way valve 252 is connected to the second port of the gas supply pipe 240, and the third port of the three-way valve 252 is connected to the gas source 253.

[0071] In the above implementation, the three-way valve 252 can control its third port to connect with the first port, that is, to connect the gas source 253 and the vacuum ejector 251, or its third port to connect with the second port, that is, to connect the gas source 253 and the gas supply pipe 240.

[0072] The following is a brief introduction to the working principle of the three-way valve 252.

[0073] When it is necessary to suck the liquid cargo into the buffer tank 210, the third port of the three-way valve 252 is connected to the first port. The gas from the gas source 253 enters the first inlet of the vacuum ejector 251 and is output to the outside through the outlet of the vacuum ejector 251, which makes the gas pressure at the second inlet of the vacuum ejector 251 lower. Thus, the gas in the buffer tank 210 is pumped into the gas delivery pipe 240 through the gas delivery pipe 240, and then the liquid cargo is sucked into the buffer tank 210 through the tank cleaning pipe 220.

[0074] When liquid needs to be discharged from buffer tank 210, the third port of three-way valve 252 connects to the second port, and gas from gas source 253 enters gas delivery pipe 240 and then enters buffer tank 210, increasing the gas pressure inside buffer tank 210. This causes the liquid in buffer tank 210 to be forced out through transfer pipe 230 until it enters liquid delivery pipe 120.

[0075] For example, the gas source 253 can output an inert gas, such as nitrogen. The gas source 253 may be a compressed air pipe, a gas generator, etc., and this disclosure is not limited thereto.

[0076] In this embodiment, the cleaning assembly 20 further includes a gas shut-off valve 260, which is disposed in the gas supply pipe 240 and located between the second inlet of the vacuum ejector 251 and the buffer tank 210.

[0077] In the above implementation, the gas shut-off valve 260 is used to control the connection or disconnection between the vacuum ejector 251 and the buffer tank 210. When it is necessary to draw liquid into the buffer tank 210, the gas shut-off valve 260 opens, connecting the vacuum ejector 251 and the buffer tank 210. When it is necessary to discharge liquid from the buffer tank 210, the gas shut-off valve 260 closes, shutting off the connection between the vacuum ejector 251 and the buffer tank 210.

[0078] In this embodiment, the tank cleaning assembly 20 further includes a first liquid cargo shut-off valve 270, which is disposed in the transmission pipe 230 and located between the liquid cargo pipe 120 and the buffer tank 210.

[0079] In the above implementation, the first cargo shut-off valve 270 is used to control the connection or disconnection between the cargo pipeline 120 and the buffer tank 210. When pumping cargo, the first cargo shut-off valve 270 is closed, disconnecting the cargo pipeline 120 and the buffer tank 210. During tank cleaning operations, the first cargo shut-off valve 270 is opened, connecting the cargo pipeline 120 and the buffer tank 210.

[0080] In this embodiment, the tank cleaning assembly 20 further includes a first one-way valve 280, which is disposed between the first port and the second port of the tank cleaning pipe 220.

[0081] In the above implementation, the inlet end of the first one-way valve 280 is connected to the first port of the cleaning pipe 220, and the outlet end of the first one-way valve 280 is connected to the second port of the cleaning pipe 220, so that the liquid can only flow from the first port of the cleaning pipe 220 to the second port, thereby preventing the liquid in the buffer tank 210 from flowing back through the cleaning pipe 220.

[0082] In this embodiment, the cleaning assembly 20 further includes a second one-way valve 290, which is disposed between the first port and the second port of the transmission pipe 230.

[0083] In the above implementation, the inlet end of the second one-way valve 290 is connected to the first port of the transmission pipe 230, and the outlet end of the second one-way valve 290 is connected to the second port of the transmission pipe 230, so that the liquid can only flow from the first port to the second port of the transmission pipe 230, thereby preventing the liquid in the transmission pipe 230 from flowing back into the buffer tank 210.

[0084] In this embodiment, the pump assembly 10 further includes a second liquid shut-off valve 130, which is disposed inside the liquid pipeline 120 and close to the second port of the liquid pipeline 120. The second liquid shut-off valve 130 is located between the first port of the liquid pipeline 120 and the second port of the transmission pipe 230.

[0085] In the above implementation, the second cargo shut-off valve 130 is used to control the connection or disconnection between the first port and the second port of the cargo pipe 120. When pumping cargo, the second cargo shut-off valve 130 is open, allowing cargo to flow from the first port to the second port of the cargo pipe 120, thereby achieving cargo transportation. During tank cleaning operations, the second cargo shut-off valve 130 is closed, ensuring that cargo transported by the transfer pipe 230 can only be output through the second port of the cargo pipe 120 and cannot flow back through the first port.

[0086] This disclosure provides a vessel, the vessel including... Figures 1-3 The submersible pump shown.

[0087] Because the ship includes Figures 1-3 The submersible pump shown indicates that the vessel is equipped with... Figures 1-3 The full range of benefits of the submersible pump shown will not be elaborated upon here.

[0088] In this embodiment, the vessel is a liquid cargo carrier used to transport various liquid cargoes.

[0089] In this embodiment, the liquid cargo tank 100 is located below the deck 200 of the ship, and the liquid cargo pump includes a mounting bracket 30 connected to the deck 200. The pump assembly 10 is connected to the mounting bracket 30, so that the mounting bracket 30 can provide a stable mounting base for the pump assembly.

[0090] In this embodiment, for ease of operation, the gas source device 250, gas shut-off valve 260, first liquid cargo shut-off valve 270, and second liquid cargo shut-off valve 130 are all located above the deck 200. For ease of liquid cargo intake, the buffer tank 210 is located in the liquid cargo tank 100 below the deck 200.

[0091] To facilitate the intake of liquid cargo by the pump assembly 10 and the tank cleaning assembly 20, a liquid cargo well 300 is provided at the bottom of the liquid cargo tank 100. The liquid cargo well 300 is recessed downward relative to the bottom of the liquid cargo tank 100, and the first port of the liquid cargo pipe 120 and the first port of the tank cleaning pipe are both located inside the liquid cargo well 300.

[0092] In this embodiment, the cargo pipe 120 includes a vertical section 121 located below the deck and a horizontal section 122 located above the deck 200. The vertical section 121 of the cargo pipe 120 extends vertically, and the horizontal section 122 of the cargo pipe 120 extends horizontally. The second cargo shut-off valve 130 and the second port of the transfer pipe 230 are both located in the horizontal section 122 of the cargo pipe 120.

[0093] In the above implementation, since the second port of the transmission pipe 230 is located in the horizontal section 122 of the liquid cargo pipe 120, when the liquid enters the liquid cargo pipe 120 through the second port of the transmission pipe 230, it will flow directly into the horizontal section 122 of the liquid cargo pipe 120, preventing the liquid from flowing back through the vertical section 121 of the liquid cargo pipe 120. Furthermore, since the second liquid cargo shut-off valve 130 is also located in the horizontal section 122 of the liquid cargo pipe 120, it can further confine the liquid input into the liquid cargo pipe 120 through the second port of the transmission pipe 230 to the horizontal section 122 of the liquid cargo pipe 120, thus preventing the backflow problem.

[0094] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships; when the absolute position of the described objects changes, the relative positional relationship may also change accordingly.

[0095] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A submersible pump, characterized in that, For use in ships, the submersible pump includes: a pump assembly (10) and a tank cleaning assembly (20); The pump assembly (10) includes a pump body (110) and a liquid cargo pipe (120). The pump body (110) is connected to the liquid cargo pipe (120). The first port of the liquid cargo pipe (120) is located at the bottom of the pump body (110), and the second port of the liquid cargo pipe (120) is located at the top of the pump body (110). The tank cleaning assembly (20) includes a buffer tank (210), a tank cleaning pipe (220), a transmission pipe (230), a gas transmission pipe (240), and a gas source device (250). The buffer tank (210) is connected to the middle of the liquid cargo pipe (120). The first port of the tank cleaning pipe (220) is close to the first port of the liquid cargo pipe (120). The second port of the tank cleaning pipe (220) is connected to the buffer tank (210). The first port of the transmission pipe (230) is connected to the buffer tank (210). The second port of the transmission pipe (230) is connected to the part of the liquid cargo pipe (120) near its own second port. The first port of the gas supply pipe (240) is connected to the buffer tank (210). The second port of the gas supply pipe (240) is connected to the gas source device (250). The gas source device (250) is connected to the pump body (110). The gas source device (250) is used to draw air or blow air into the buffer tank (210) through the gas supply pipe (240).

2. The submersible pump according to claim 1, characterized in that, The buffer tank (210) has an insertion hole (211); The buffer tank (210) is sleeved outside the liquid cargo pipe (120), and the wall of the insertion hole (211) is connected to the outer wall of the liquid cargo pipe (120).

3. The submersible pump according to claim 1, characterized in that, In the vertical direction perpendicular to the horizontal plane, the distance between the top and bottom of the buffer tank (210) is 0.8 to 1.2 meters, the distance between the top of the buffer tank (210) and the first port of the cleaning pipe (220) is less than 5 meters, and the distance between the bottom of the buffer tank (210) and the first port of the cleaning pipe (220) is less than 2 meters.

4. The submersible pump according to claim 1, characterized in that, The gas source device (250) includes a vacuum ejector (251), a three-way valve (252), and a gas source (253); The first inlet of the vacuum ejector (251) is connected to the first port of the three-way valve (252), and the second inlet of the vacuum ejector (251) is connected to the second port of the gas supply pipe (240). The second port of the three-way valve (252) is connected to the second port of the gas pipeline (240), and the third port of the three-way valve (252) is connected to the gas source (253).

5. The submersible pump according to claim 4, characterized in that, The cleaning assembly (20) also includes a gas shut-off valve (260); The gas shut-off valve (260) is disposed on the gas supply pipe (240), and the gas shut-off valve (260) is located between the second inlet of the vacuum ejector (251) and the buffer tank (210).

6. The submersible pump according to claim 1, characterized in that, The tank cleaning assembly (20) also includes a first liquid cargo shut-off valve (270); The first liquid cargo shut-off valve (270) is disposed in the transmission pipe (230), and the first liquid cargo shut-off valve (270) is located between the liquid cargo pipe (120) and the buffer tank (210).

7. The submersible pump according to claim 1, characterized in that, The tank cleaning assembly (20) also includes a first one-way valve (280); The first one-way valve (280) is disposed between the first port and the second port of the cleaning pipe (220).

8. The submersible pump according to claim 1, characterized in that, The cleaning assembly (20) also includes a second one-way valve (290); The second one-way valve (290) is disposed between the first port and the second port of the transmission pipe (230).

9. The submersible pump according to claim 1, characterized in that, The pump assembly (10) also includes a second liquid shut-off valve (130); The second liquid cargo shut-off valve (130) is disposed inside the liquid cargo pipe (120) and close to the second port of the liquid cargo pipe (120). The second liquid cargo shut-off valve (130) is located between the first port of the liquid cargo pipe (120) and the second port of the transmission pipe (230).

10. A ship, characterized in that, Includes the submersible pump as described in any one of claims 1 to 9.

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