Water cooling system for ship LNG fuel engine

Abstract

The invention relates to the technical field of ship LNG (Liquefied Natural Gas) fuel engines, and provides a water cooling system for a ship LNG fuel engine, which comprises a water suction pump for pumping seawater, a closed fresh water circulating device and a heat exchange device, a counterweight type filter cartridge is arranged at the water inlet end of the water pumping pipe, and a temperature sensor is arranged on the counterweight type filter cartridge; the water cooling system further comprises a retracting and releasing assembly used for adjusting the water inlet length of the water pumping pipe and a detection assembly used for detecting obstacles in the advancing direction of the balance weight type filter cartridge. The water inlet length of the water pumping pipe can be adjusted through the retractable assembly according to the actual temperature of the sea area where the ship is located, namely the underwater depth position of the water inlet end of the water pumping pipe is adjusted, and the temperature of seawater in the depth area where the water inlet end of the water pumping pipe is located is sensed in real time through the temperature sensor, so that the temperature of the pumped seawater is low, and the heat exchange efficiency is high; and the cooling requirement of the LNG fuel engine is further met.

Description

Technical Field

[0001] The present invention relates to the technical field of marine LNG fuel engines, and particularly to a water cooling system for a marine LNG fuel engine. Background Art

[0002] Currently, the water cooling systems of marine LNG fuel engines generally adopt a cooperative architecture of closed fresh water circulation and heat exchange with seawater. Its technical solution is as follows: The closed fresh water circuit drives fresh water to flow through the cooling channels of the engine cylinder block and auxiliary high-temperature components through a circulation pump. After absorbing the heat load of the engine, the high-temperature fresh water enters a plate-type (or shell-and-tube type) heat exchanger to exchange heat with the open seawater circuit, and returns to the closed circulation system after being cooled by seawater, so as to achieve the temperature control of engine heat dissipation.

[0003] However, the water intake of the seawater circuit is usually fixed at a preset depth on the side of the ship's hull, resulting in a significant influence on the seawater suction temperature by the change of the surface water temperature in the navigation area. When the ship sails in tropical or equatorial waters, the surface seawater temperature rises (often reaching above 30°C), and the heat exchange temperature difference between the seawater and the high-temperature fresh water shrinks, directly causing a significant attenuation of the heat exchange efficiency, and then leading to a decrease in the cooling capacity of the closed fresh water circuit, that is, the cooling and heat dissipation effect on the engine is greatly reduced. This problem will cause risks to the operating stability of the engine and seriously affect the reliability of the ship's power system.

[0004] Therefore, the present invention proposes a water cooling system for a marine LNG fuel engine to solve the above problems. Summary of the Invention

[0005] The purpose of the embodiment of the present invention is to provide a water cooling system for a marine LNG fuel engine to solve the above problems.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A water cooling system for a marine LNG fuel engine includes a water pump for pumping seawater, a closed fresh water circulation device, and a heat exchange device. The water intake end of the water pump is connected with a suction pipe whose water intake length can be adjusted. The water inlet end of the suction pipe is provided with a weighted filter cartridge, and a temperature sensor for sensing the seawater temperature is arranged on the weighted filter cartridge.

[0008] The water cooling system further includes a retracting and extending assembly for adjusting the water intake length of the suction pipe and a detection assembly for detecting obstacles in the advancing direction of the weighted filter cartridge. When the detection assembly detects an obstacle in the advancing direction of the weighted filter cartridge, the retracting and extending assembly shortens the water intake length of the suction pipe so that the weighted filter cartridge is located above the obstacle until the weighted filter cartridge completely crosses the obstacle, and then the retracting and extending assembly extends the suction pipe to the previous water intake length.

[0009] In an alternative solution: The water cooling system further includes a storage box for storing the water suction pipe.

[0010] In an alternative solution: The winding and unwinding assembly includes two winding and unwinding wheels disposed in the storage box and a driving structure for driving the two winding and unwinding wheels to rotate towards each other, and the two winding and unwinding wheels clamp the water suction pipe.

[0011] In an alternative solution: A winding drum for winding the water suction pipe is further rotatably disposed in the storage box. The winding drum includes a fixed base, a cylinder body rotatably disposed on the base in a sealed manner, and a baffle plate disposed on the cylinder body. A clockwork spring structure is disposed between the baffle plate and the inner wall of the storage box. A first annular cavity is disposed at one end of the cylinder body close to the base, and a second annular cavity communicating with the first annular cavity is disposed on the base. The water suction pipe is wound around the cylinder body, and the water outlet end of the water suction pipe communicates with the first annular cavity. A conduit is disposed in communication between the second annular cavity and the water pumping end of the water pump.

[0012] In an alternative solution: The detection assembly includes a mounting cylinder disposed on the weighted filter cartridge, a first bracket disposed on the mounting cylinder, and a mounting rod hinged to the first bracket. A through opening is disposed on the wall of the mounting cylinder. One end of the mounting rod passes through the through opening and is located in the mounting cylinder, and a support rod is disposed at this end. A weight is disposed at the end of the support rod away from the mounting rod and falls on the inner bottom of the mounting cylinder. The inner bottom of the mounting cylinder is arc-shaped to adapt to the inclination when the weighted filter cartridge travels, so that the mounting rod is always in a horizontal state. A second bracket is disposed at the end of the mounting rod away from the mounting cylinder. A first sonar detection head for detecting obstacles in the horizontal direction and a second sonar detection head for detecting obstacles in the vertical direction are disposed on the second bracket. A plurality of guide plates are further disposed on the weighted filter cartridge for enabling the first sonar detection head and the second sonar detection head to always detect along the traveling direction of the weighted filter cartridge.

[0013] In an alternative solution: The water cooling system further includes a decontamination assembly for cleaning the filter surface of the weighted filter cartridge.

[0014] In an alternative solution: The decontamination assembly includes an impeller disposed on the second bracket, a ring body concentric with the weighted filter cartridge and rotatably disposed, and a strip brush disposed on the ring body and in contact with the filter surface of the weighted filter cartridge. A toothed ring is concentrically disposed on the ring body. The decontamination assembly further includes a rotating shaft, and a driving gear meshing with the toothed ring is disposed on the rotating shaft. A universal coupling is disposed between the shaft body of the impeller and the rotating shaft.

[0015] Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows:

[0016] 1. The water intake length of the water extraction pipe can be adjusted through the retracting and extending assembly according to the actual temperature of the sea area where the ship is located, that is, the depth position of the water inlet end of the water extraction pipe underwater is adjusted. The deeper the underwater depth, the lower the seawater temperature in that depth area. The seawater temperature in the depth area where the water inlet end of the water extraction pipe is located is sensed in real time through a temperature sensor, so that the extracted seawater has a lower temperature and a higher heat exchange efficiency, thereby meeting the cooling requirements of the LNG fuel engine.

[0017] 2. The obstacle detection component is used to detect obstacles in the advancing direction of the weighted filter cartridge. When an obstacle is detected in the advancing direction of the weighted filter cartridge, the retracting and extending assembly shortens the water intake length of the water extraction pipe so that the weighted filter cartridge is located above the obstacle until the weighted filter cartridge completely crosses the obstacle, and then the retracting and extending assembly extends the water extraction pipe to the previous water intake length, thereby preventing the weighted filter cartridge from being stuck by the obstacle and ensuring the stable progress of the seawater extraction work.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. Brief Description of the Drawings

[0019] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing the embodiments consistent with this application, and are used together with the specification to explain the principles of this application. At the same time, these drawings and the text description are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0021] Figure 2 It is a schematic internal structure diagram of the storage box in an embodiment of the present invention.

[0022] Figure 3 It is a schematic structural diagram of the winding drum in an embodiment of the present invention.

[0023] Figure 4 It is another angle schematic structural diagram of the winding drum in an embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of the arrangement among the weighted filter cartridge, the detection component and the decontamination component in an embodiment of the present invention.

[0025] Figure 6 For Figure 5 the enlarged view at A in

[0026] Figure 7 It is a schematic diagram of the arrangement among the impeller, the rotating shaft, the universal coupling and the second bracket in an embodiment of the present invention.

[0027] Figure 8 This is a schematic diagram of the state of the counterweight filter cartridge, the detection component, and the decontamination component during the navigation of the ship in the embodiment of the present invention.

[0028] Annotation of reference numerals in the drawings: 1 - water pump, 2 - closed fresh water circulation device, 3 - heat exchange device, 4 - water suction pipe, 5 - retracting and deploying assembly, 501 - driving member, 502 - retracting and deploying wheel, 503 - base, 504 - cylinder body, 505 - baffle, 506 - first annular cavity, 507 - second annular cavity, 508 - conduit, 509 - clockwork spring structure, 6 - counterweight filter cartridge, 7 - temperature sensor, 8 - detection component, 801 - mounting cylinder, 802 - first bracket, 803 - mounting rod, 804 - second bracket, 805 - first sonar detection head, 806 - second sonar detection head, 807 - support rod, 808 - counterweight, 809 - through port, 810 - guide plate, 9 - decontamination component, 901 - impeller, 902 - ring body, 903 - strip brush, 904 - gear ring, 905 - rotating shaft, 906 - driving gear, 907 - universal coupling, 10 - storage box. Detailed implementation manners

[0029] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0030] Please refer to Figure 1 , a water cooling system for a ship LNG fuel engine, including a water pump 1 for pumping seawater, a closed fresh water circulation device 2, and a heat exchange device 3. The water suction end of the water pump 1 is connected with a water suction pipe 4 with an adjustable water inlet length. The water inlet end of the water suction pipe 4 is provided with a counterweight filter cartridge 6, and a temperature sensor 7 for sensing the temperature of seawater is arranged on the counterweight filter cartridge 6;

[0031] The water cooling system further includes a retracting and deploying assembly 5 for adjusting the water inlet length of the water suction pipe 4 and a detection component 8 for detecting obstacles in the advancing direction of the counterweight filter cartridge 6. When the detection component 8 detects an obstacle in the advancing direction of the counterweight filter cartridge 6, the retracting and deploying assembly 5 shortens the water inlet length of the water suction pipe 4 so that the counterweight filter cartridge 6 is located above the obstacle until the counterweight filter cartridge 6 completely crosses the obstacle, and then the retracting and deploying assembly 5 lengthens the water suction pipe 4 to the previous water inlet length.

[0032] The water pump 1 and the closed fresh water circulation device 2 are both connected to the heat exchange device 3. The low-temperature seawater is pumped by the water pump 1 and transported to the heat exchange device 3. In the fresh water circuit of the closed fresh water circulation device 2, the fresh water is driven by a circulation pump to flow through the LNG fuel engine cylinder block and the cooling flow passages of the attached high-temperature components for heat absorption. Then, the high-temperature fresh water enters the heat exchange device 3 to exchange heat with the low-temperature seawater. After being cooled by the low-temperature seawater, the high-temperature fresh water returns to form a closed fresh water circulation, thereby realizing the heat dissipation temperature control of the LNG fuel engine. The seawater after heat exchange is discharged from the drainage end of the heat exchange device 3. The water intake length of the water suction pipe 4 can be adjusted by the retracting and extending assembly 5 according to the actual temperature of the sea area where the ship is located, that is, the depth position of the water intake end of the water suction pipe 4 underwater is adjusted. The deeper the underwater depth, the lower the seawater temperature in that depth area. The seawater temperature in the depth area where the water intake end of the water suction pipe 4 is located is sensed in real time by the temperature sensor 7, so that the pumped seawater has a lower temperature and a higher heat exchange efficiency, thereby meeting the cooling requirements of the LNG fuel engine. The weight-type filter cartridge 6 plays a role in weighting to drive the water intake end of the water suction pipe 4 to sink, and at the same time also plays a role in filtering seawater to prevent the entry of dirt in the seawater into the water suction pipe 4 and cause blockage. The obstacle detection component 8 detects obstacles (such as reefs) in the traveling direction of the weight-type filter cartridge 6. When an obstacle is detected in the traveling direction of the weight-type filter cartridge 6, the retracting and extending assembly 5 shortens the water intake length of the water suction pipe 4 so that the weight-type filter cartridge 6 is located above the obstacle until the weight-type filter cartridge 6 completely crosses the obstacle, and then the retracting and extending assembly 5 extends the water suction pipe 4 to the previous water intake length, thereby preventing the weight-type filter cartridge 6 from being stuck by the obstacle and ensuring the stable operation of the seawater pumping work.

[0033] It should be noted that the closed fresh water circulation device 2 and the heat exchange device 3 are prior arts, and the specific structures and working principles of the closed fresh water circulation device 2 and the heat exchange device 3 will not be elaborated here.

[0034] Please refer to Figures 1 to 4 , in an embodiment of the present invention, the water cooling system further includes a storage box 10 for storing the water suction pipe 4;

[0035] The retracting and extending assembly 5 includes two retracting and extending wheels 502 provided in the storage box 10 and a driving structure 501 for driving the two retracting and extending wheels 502 to rotate towards each other. The two retracting and extending wheels 502 clamp the water suction pipe 4;

[0036] The storage box 10 also has a winding drum for winding up the water pumping pipe 4, which includes a fixed base 503, a cylinder 504 that is sealed and rotatable on the base 503, and a baffle 505 on the cylinder 504. A clockwork spring structure 509 is provided between the baffle 505 and the wall of the storage box 10. A first annular cavity 506 is provided at one end of the cylinder 504 close to the base 503. A second annular cavity 507 that is connected to the first annular cavity 506 is provided on the base 503. The water pumping pipe 4 is wound on the cylinder 504, and the water outlet end of the water pumping pipe 4 is connected to the first annular cavity 506. A conduit 508 is provided between the second annular cavity 507 and the water pumping end of the water pump 1.

[0037] It should be noted that the water pumping pipe 4 is preferably made of a stainless steel hose, which will not be squeezed and deformed due to the jamming of the two retracting and releasing wheels 502, and ensures that the water pumping pipe 4 will not be shrunk and folded when rolled up, thereby ensuring that the water path is unobstructed; in addition, the clockwork spring structure 509 includes a spring steel belt, a reel, a central axis, etc., which is a prior art, and its specific structure and connection relationship will not be elaborated here.

[0038] In this embodiment, the driving structure 501 drives the two retracting and releasing wheels 502 to rotate in opposite directions to realize the retracting and releasing of the water pumping pipe 4, that is, to adjust the depth position of the water inlet end of the water pumping pipe 4 under water, and to reel in the water pumping pipe 4 through the reel to prevent it from being tangled. Specifically, when the water pumping pipe 4 is released, it will pull and drive the cylinder 504 to rotate counterclockwise (see the attached manual). Figure 2 The pumping pipe 4 is released as shown in the figure, and the spring steel belt part in the clockwork spring structure 509 is applied with a pre-tightening torque. When the pumping pipe 4 is recovered, the cylinder 504 is reset and rotated clockwise under the action of the clockwork spring structure 509, thereby winding up the recovered pumping pipe 4; the pumped seawater enters the first annular cavity 506 from the water outlet end of the pumping pipe 4, and then enters the second annular cavity 507 and is connected with the pumping end of the pump 1 through the conduit 508, and is pumped into the heat exchange device 3 by the pump 1 to exchange heat with the high-temperature fresh water.

[0039] Furthermore, in this embodiment, the driving structure 501 includes a driving motor, which is a bidirectional motor. Gears are provided on the two retracting wheels 502 (not shown in the figure), and the two gears are meshed. By driving the driving motor to drive any one of the two retracting wheels 502 to rotate, the two retracting wheels 502 can rotate in opposite directions, thereby realizing the retraction and extension of the water pumping pipe 4.

[0040] See also Figures 5 to 8In one embodiment of the present invention, the detection assembly 8 includes a mounting cylinder 801 arranged on the counterweight filter cartridge 6, a first bracket 802 arranged on the mounting cylinder 801, and a mounting rod 803 hinged on the first bracket 802. The mounting cylinder 801 is provided with a through hole 809 on the cylinder wall. One end of the mounting rod 803 passes through the through hole 809 and is located in the mounting cylinder 801, and the end is provided with a support rod 807. The end of the support rod 807 away from the mounting rod 803 is provided with a counterweight 808 falling on the bottom of the mounting cylinder 801. The bottom of the mounting cylinder 801 is arc-shaped to adapt to the tilt of the counterweight filter cartridge 6 when it moves (as shown in the attached manual). Figure 8 As shown), the mounting rod 803 is always in a horizontal state, and a second bracket 804 is provided at one end of the mounting rod 803 away from the mounting tube 801, and a first sonar detection head 805 for detecting obstacles in the horizontal direction and a second sonar detection head 806 for detecting obstacles in the vertical direction are provided on the second bracket 804. The counterweight filter cartridge 6 is also provided with a plurality of guide plates 810, which are used to ensure that the first sonar detection head 805 and the second sonar detection head 806 always detect along the moving direction of the counterweight filter cartridge 6.

[0041] In this embodiment, the first sonar detection head 805 is used to detect obstacles horizontally and forward along the direction of travel of the counterweight filter cartridge 6. When an obstacle is detected, the retractable assembly 5 reacts by shortening the water entry length of the water suction pipe 4 so that the counterweight filter cartridge 6 is located above the obstacle and thus crosses the obstacle. After crossing the obstacle, the second sonar detection head 806 is used to detect the obstacle in the vertical direction to determine whether the counterweight filter cartridge 6 has completely crossed the obstacle. Specifically, the second sonar detection head 806 performs lateral detection of the target obstacle. As the counterweight filter cartridge 6 moves forward, when the second sonar detection head 806 cannot detect the target obstacle, it means that the counterweight filter cartridge 6 has completely crossed the obstacle. The water suction pipe 4 is lengthened to the previous water entry length by the retractable assembly 5. The second bracket 804 always has an upward tendency under the action of the gravity of the counterweight 808. The counterweight 808 is supported by the bottom of the mounting tube 801. When the counterweight filter cartridge 6 is tilted during movement, the mounting tube 801 is tilted accordingly. In the vertical direction, the point where the counterweight 808 falls on the bottom of the mounting tube 801 will become lower, and the counterweight 808 deflects downward until it falls on the bottom of the mounting tube 801 again. The downward deflection of the counterweight 808 drives the second bracket 804 to tilt upward, and the mounting rod 803 is always in a horizontal state, so that the first sonar detection head 805 and the second sonar detection head 806 always maintain the corresponding horizontal and vertical detection states, and are not affected by the tilt of the counterweight filter cartridge 6. It should be noted that the detection component 8 also includes a matching signal receiving unit, a signal analysis unit, a control execution unit, etc. The corresponding algorithm and the linkage coordination with the retractable component 5 belong to the prior art and will not be elaborated here.

[0042] Based on the previous embodiment, please refer to Figure 5 and Figure 6 , in an embodiment of the present invention, the water cooling system further includes a decontamination component 9 for cleaning the filter surface of the weighted filter cartridge 6;

[0043] The decontamination component 9 includes an impeller 901 provided on the second bracket 804, a ring body 902 that is concentric with the weighted filter cartridge 6 and is rotatably arranged, and a strip brush 903 provided on the ring body 902 and in contact with the filter surface of the weighted filter cartridge 6. A toothed ring 904 is concentrically arranged on the ring body 902. The decontamination component 9 further includes a rotating shaft 905. A driving gear 906 meshing with the toothed ring 904 is provided on the rotating shaft 905. A universal coupling 907 is provided between the shaft body of the impeller 901 and the rotating shaft 905 (both ends of the universal coupling 907 are fixedly connected to the end of the shaft body of the impeller 901 and the end of the rotating shaft 905 respectively).

[0044] In this embodiment, when the weighted filter cartridge 6 moves forward, the water flow drives the impeller 901 to rotate, and then drives the ring body 902 to rotate, so that the strip brush 903 sweeps around the filter surface of the weighted filter cartridge 6, thereby brushing off the dirt adhering to the filter surface of the weighted filter cartridge 6 and avoiding the accumulation and blockage of dirt; it should be noted that the impeller 901 is arranged on the second bracket 804, and when the weighted filter cartridge 6 moves forward, the water flow vertically impacts on the impeller 901, maximizing the impact conversion efficiency. Since the impeller 901 is arranged on the second bracket 804, it can also always maintain the initial setting state and is not affected by the skew of the weighted filter cartridge 6, so as to ensure that the impeller 901 can be efficiently driven by the water flow, and then drive the strip brush 903 to sweep around the filter surface of the weighted filter cartridge 6 to achieve decontamination.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A water cooling system for a ship LNG fuel engine, comprising a water pump (1) for extracting seawater, a closed fresh water circulation device (2) and a heat exchange device (3), characterized in that: The water pump (1) is connected to a water pumping pipe (4) whose water inlet length can be adjusted, and a weighted filter cartridge (6) is provided at the water inlet end of the water pumping pipe (4). A temperature sensor (7) for sensing the temperature of seawater is provided on the weighted filter cartridge (6); The water cooling system further comprises a retractable assembly (5) for adjusting the water entry length of the water pumping pipe (4) and a detection assembly (8) for detecting obstacles in the direction of travel of the counterweight filter cartridge (6). When the detection assembly (8) detects that there is an obstacle in the direction of travel of the counterweight filter cartridge (6), the retractable assembly (5) shortens the water entry length of the water pumping pipe (4) so ​​that the counterweight filter cartridge (6) is located above the obstacle until the counterweight filter cartridge (6) completely crosses the obstacle, and the retractable assembly (5) lengthens the water pumping pipe (4) to the previous water entry length.

2. The water cooling system for a ship LNG fuel engine according to claim 1, characterized in that: The water cooling system also includes a storage box (10) for storing the water pumping pipe (4).

3. The water cooling system for a ship LNG fuel engine according to claim 2, characterized in that: The retractable assembly (5) comprises two retractable wheels (502) arranged in the storage box (10) and a driving structure (501) for driving the two retractable wheels (502) to rotate in opposite directions, and the two retractable wheels (502) clamp the water pumping pipe (4).

4. The water cooling system for a ship LNG fuel engine according to claim 3, characterized in that: The storage box (10) is also rotatably provided with a winding drum for winding up the water pumping pipe (4), the winding drum comprising a fixed base (503), a cylinder (504) rotatably provided on the base (503), and a baffle (505) provided on the cylinder (504), a spring structure (509) being provided between the baffle (505) and the wall of the storage box (10), a first annular cavity (506) being provided at one end of the cylinder (504) close to the base (503), a second annular cavity (507) being provided on the base (503) and being communicated with the first annular cavity (506), the water pumping pipe (4) being wound on the cylinder (504), and the water outlet end of the water pumping pipe (4) being communicated with the first annular cavity (506), and a conduit (508) being provided between the second annular cavity (507) and the water pumping end of the water pump (1).

5. The water cooling system for a ship LNG fuel engine according to claim 1, characterized in that: The detection assembly (8) comprises a mounting cylinder (801) arranged on the counterweight filter cartridge (6), a first bracket (802) arranged on the mounting cylinder (801), and a mounting rod (803) hinged on the first bracket (802); a through hole (809) is arranged on the wall of the mounting cylinder (801); one end of the mounting rod (803) passes through the through hole (809) and is located in the mounting cylinder (801), and a support rod (807) is arranged on the end; the end of the support rod (807) away from the mounting rod (803) is provided with a counterweight (808) falling on the bottom of the mounting cylinder (801); the bottom of the mounting cylinder (801) is arc-shaped to adapt to the counterweight. The heavy filter cartridge (6) is tilted when traveling so that the mounting rod (803) is always in a horizontal state. A second bracket (804) is provided at one end of the mounting rod (803) away from the mounting cylinder (801). The second bracket (804) is provided with a first sonar detection head (805) for detecting obstacles in the horizontal direction and a second sonar detection head (806) for detecting obstacles in the vertical direction. The counterweight filter cartridge (6) is also provided with a plurality of guide plates (810) for allowing the first sonar detection head (805) and the second sonar detection head (806) to always detect along the traveling direction of the counterweight filter cartridge (6).

6. The water cooling system for a ship LNG fuel engine according to claim 5, characterized in that: The water cooling system also includes a dirt removal component (9) for cleaning the filter surface of the weighted filter cartridge (6).

7. The water cooling system for a ship LNG fuel engine according to claim 6, characterized in that: The dirt removal component (9) comprises an impeller (901) arranged on a second bracket (804), a ring body (902) which is rotatably arranged concentrically with the counterweight filter cartridge (6), and a strip brush (903) which is arranged on the ring body (902) and contacts the filter surface of the counterweight filter cartridge (6), a gear ring (904) being concentrically arranged on the ring body (902), and the dirt removal component (9) further comprises a rotating shaft (905), a driving gear (906) which meshes with the gear ring (904) being arranged on the rotating shaft (905), and a universal coupling (907) being arranged between the shaft body of the impeller (901) and the rotating shaft (905).

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