Water circulation system of marine water-cooled heat exchanger

Abstract

The application relates to the technical field of water-cooled heat exchangers, in particular to a marine water-cooled heat exchanger water circulation system, which comprises a mounting seat arranged on the surface of a plate heat exchanger, a filter screen arranged in a water inlet pipe, and a rotating seat arranged in a cleaning seat. When too many large-particle impurities in seawater are attached to the filter screen, a first switch valve is closed, a second switch valve is opened, a pressurizing valve is started, cleaning liquid flows into the cleaning seat from a cleaning water tank through a first water injection pipe and a second water injection pipe, pressurized water in the second water injection pipe flows into the rotating seat and is sprayed from a cleaning nozzle, pressurized water in the first water injection pipe drives the rotating seat and the cleaning nozzle on the front surface of the rotating seat to rotate and spray water, the cleaning nozzle sprays high-pressure water flow outward from the center to the outer ring under the action of centrifugal force and a stretching spring, so that the large-particle impurities attached to the filter screen are all washed away and discharged through a sewage discharge pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water-cooled heat exchangers, in particular to a water circulation system of a water-cooled heat exchanger for ships. BACKGROUND

[0002] The water-cooled heat exchanger for ships is generally a plate heat exchanger. The plate heat exchanger is a high-efficiency heat exchanger composed of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various sheets for heat exchange. The plate heat exchanger is an ideal device for liquid-liquid and liquid-vapor heat exchange, which has the characteristics of high heat exchange efficiency, small heat loss, compact structure, small footprint, wide application, long service life, etc. Under the same pressure loss condition, the heat transfer coefficient of the plate heat exchanger is 3-5 times higher than that of the tube heat exchanger, the footprint is one-third of that of the tube heat exchanger, and the heat recovery rate can be as high as 90% or more.

[0003] In the prior art, the ship generally condenses the water vapor generated by heating the seawater into fresh water through the plate heat exchanger, and then inputs the fresh water into the fresh water tank for storage by a fresh water pump.

[0004] However, the conventional water-cooled heat exchanger for ships generally condenses water vapor by inputting seawater with a relatively low temperature. Generally, there are large-particle impurities in the input seawater. The large-particle impurities in the seawater may block the pipeline or adhere to the surface of the metal sheet for heat exchange in the water-cooled heat exchanger, thereby reducing the efficiency of the water-cooled heat exchanger for condensing fresh water, and the large-particle impurities may also affect the normal operation of the water-cooled heat exchanger. Therefore, the present application provides a water circulation system of a water-cooled heat exchanger for ships to solve the above problems. SUMMARY

[0005] The present application aims to provide a water circulation system of a water-cooled heat exchanger for ships to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: a water circulation system of a water-cooled heat exchanger for ships, comprising: a plate heat exchanger, a mounting seat is arranged on the front surface of the plate heat exchanger, a telescopic slot is formed on the side surface inside the mounting seat, a limiting column is arranged in the telescopic slot, a limiting spring is sleeved on the rear section of the limiting column, a limiting seat is sleeved on the outer surface of the mounting seat, the limiting seat is sleeved on the surface of a limiting threaded rod at both ends, and a limiting nut is arranged on the surface of the limiting threaded rod;

[0007] a water inlet pipe, a mounting flange is arranged at the end of the water inlet pipe, a limiting slot is formed on the outer side of the rear surface of the mounting flange, a sealing ring is arranged on the front surface of the mounting flange, a first on-off valve is arranged on the rear section of the water inlet pipe, a blowdown pipe is arranged on the lower surface of the water inlet pipe, a second on-off valve is arranged on the middle section of the blowdown pipe, a filter screen is arranged in the water inlet pipe, and a cleaning seat is arranged on the front side of the filter screen;

[0008] The sewage cleaning seat is provided with a backflow pipe on the lower surface, a first water injection pipe on the upper surface, and a second water injection pipe on the rear surface. The upper ends of the first and second water injection pipes are arranged at the end of the pressure valve. The rear end of the pressure valve is provided with a cleaning water tank. A rotating seat is arranged in the sewage cleaning seat. An adjusting seat is arranged on the front surface of the rotating seat. A water injection end is arranged in the adjusting seat. A cleaning nozzle is arranged on the front surface of the water injection end. A base is arranged on the front surface of the rotating seat. A stabilizing shaft is arranged in the base. A tension spring is arranged on the surface of the base. A force receiving plate is arranged on the outer side of the rear surface of the rotating seat.

[0009] Preferably, the mounting seat is fixedly connected to the front surface of the plate heat exchanger. The telescopic groove arranged on the inner side of the mounting seat has a cylindrical structure.

[0010] Preferably, the limiting column is in sliding connection with the telescopic groove. One end of the limiting spring is fixedly connected to the surface of the telescopic groove. The other end of the limiting spring is fixedly connected to the middle section of the limiting column.

[0011] Preferably, the limiting seat is in sliding connection with the surface of the mounting seat. The two ends of the limiting seat are in sliding connection with the limiting threaded rod. The limiting nut is in threaded connection with the limiting threaded rod.

[0012] Preferably, the mounting flange is fixedly connected to the end of the water conveying pipe. The limiting groove arranged on the outer side of the rear surface of the mounting flange has a cylindrical structure. The sealing ring is fixedly connected to the front surface of the mounting flange.

[0013] Preferably, the first switch valve is fixedly connected to the rear section of the water conveying pipe. The blowdown pipe is fixedly connected to the lower surface of the water conveying pipe. The second switch valve is fixedly connected to the middle section of the blowdown pipe. The filter screen is fixedly connected to the inner surface of the water conveying pipe.

[0014] Preferably, the sewage cleaning seat is fixedly connected to the inner surface of the water conveying pipe. The backflow pipe is fixedly connected to the lower surface of the sewage cleaning seat. The other end of the backflow pipe is fixedly connected to the surface of the cleaning water tank. The first water injection pipe is fixedly connected to the upper surface of the sewage cleaning seat. The second water injection pipe is fixedly connected to the rear surface of the sewage cleaning seat. The upper ends of the first and second water injection pipes are fixedly connected to the end of the pressure valve.

[0015] Preferably, the rotating seat is in rotational connection with the sewage cleaning seat. The adjusting seat is fixedly connected to the front surface of the rotating seat. The water injection end is in movable connection with the adjusting seat. The cleaning nozzle is fixedly connected to the front surface of the water injection end.

[0016] Preferably, the base is fixedly connected to the front surface of the rotating seat. The base is in rotational connection with the stabilizing shaft. The stabilizing shaft is fixedly connected to the inner surface of the sewage cleaning seat. One end of the tension spring is fixedly connected to the surface of the base. The other end of the tension spring is fixedly connected to the lower surface of the cleaning nozzle. The force receiving plate is fixedly connected to the outer side of the rear surface of the rotating seat.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] The water circulation system of the marine water-cooled heat exchanger provided by the present application can realize the following effects: when too many large-particle impurities in seawater are attached to the filter screen, the first switch valve is closed, the second switch valve is opened, and the pressurizing valve is started, so that the cleaning liquid flows into the cleaning seat through the first water injection pipe and the second water injection pipe, the pressurized water flow in the second water injection pipe flows into the rotating seat and is sprayed out through the cleaning spray head, the pressurized water flow in the first water injection pipe drives the rotating seat and the cleaning spray head on the front surface of the rotating seat to rotate and spray water through the impact force plate, the high-pressure water flow sprayed out by the cleaning spray head is diffused from the center to the outer ring under the action of the centrifugal force and the tension spring, so that all the large-particle impurities attached to the filter screen are washed away and discharged through the blowdown pipe. This cleaning method does not need to disassemble the filter screen, and is more convenient to operate, saves time and effort, and can reduce the entry of large-particle impurities into the plate heat exchanger, so as to ensure that the plate heat exchanger can efficiently perform water vapor condensation work. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a structural schematic diagram of the present application;

[0020] Figure 2 The figure is a front view of the structural schematic diagram of the present application;

[0021] Figure 3 The figure is a structural schematic diagram of the filter device;

[0022] Figure 4 The figure is a side view of the structural schematic diagram of the filter device;

[0023] Figure 5 The figure is a schematic diagram of the internal cleaning mechanism of the filter device;

[0024] Figure 6 The figure is a rear view of the structural schematic diagram of the cleaning seat;

[0025] Figure 7 The figure is a schematic diagram of the seawater desalination process of the marine heat exchanger.

[0026] In the figure: 1, plate heat exchanger; 2, mounting seat; 3, telescopic groove; 4, limiting column; 5, limiting spring; 6, limiting seat; 7, limiting threaded rod; 8, limiting nut; 9, water delivery pipe; 10, mounting flange; 11, limiting groove; 12, sealing ring; 13, first switch valve; 14, blowdown pipe; 15, second switch valve; 16, filter screen; 17, cleaning seat; 18, backflow pipe; 19, first water injection pipe; 20, second water injection pipe; 21, pressurizing valve; 22, cleaning water tank; 23, rotating seat; 24, adjusting seat; 25, water injection end; 26, cleaning spray head; 27, base; 28, stabilizing shaft; 29, tension spring; 30, impact force plate. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application are further described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present application and not all the embodiments, which are only used to explain the embodiments of the present application and not to limit the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0028] In the description of the present application, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by referring to examples. In the following description, many specific details are presented to provide a thorough understanding of the embodiments. However, it is obvious to those of ordinary skill in the art that the embodiments can not be limited to these specific details in practice. In some examples, well-known methods and structures are not described in detail to avoid unnecessarily complicating the embodiments. In addition, all embodiments can be used in combination with each other. Embodiment one

[0031] Please refer to Figures 1 to 7The application provides a technical scheme: a marine water-cooled heat exchanger water circulation system, which comprises a plate heat exchanger 1, the front surface of the plate heat exchanger 1 is provided with a mounting seat 2, the side surface of the mounting seat 2 is provided with an expansion slot 3, a limiting column 4 is arranged in the expansion slot 3, a limiting spring 5 is arranged on the rear section of the limiting column 4, a limiting seat 6 is arranged on the outer surface of the mounting seat 2, the limiting seat 6 is arranged on the surface of a limiting threaded rod 7 at both ends, and a limiting nut 8 is arranged on the surface of the limiting threaded rod 7; a water delivery pipe 9, the end of the water delivery pipe 9 is provided with a mounting flange 10, the outer side of the rear surface of the mounting flange 10 is provided with a limiting groove 11, the front surface of the mounting flange 10 is provided with a sealing ring 12, the rear section of the water delivery pipe 9 is provided with a first on-off valve 13, the lower surface of the water delivery pipe 9 is provided with a blowdown pipe 14, the middle section of the blowdown pipe 14 is provided with a second on-off valve 15, a filter screen 16 is arranged in the water delivery pipe 9, and the front side of the filter screen 16 is provided with a cleaning seat 17; the cleaning seat 17, the lower surface of the cleaning seat 17 is provided with a backflow pipe 18, the upper surface of the cleaning seat 17 is provided with a first water injection pipe 19, the rear surface of the cleaning seat 17 is provided with a second water injection pipe 20, the upper end of the first water injection pipe 19 and the second water injection pipe 20 is arranged at the end of a pressurizing valve 21, the rear end of the pressurizing valve 21 is provided with a cleaning water tank 22, a rotating seat 23 is arranged in the cleaning seat 17, the front surface of the rotating seat 23 is provided with an adjusting seat 24, the adjusting seat 24 is provided with a water injection end 25, the front surface of the water injection end 25 is provided with a cleaning nozzle 26, the front surface of the rotating seat 23 is provided with a base 27, the base 27 is provided with a stabilizing shaft 28, the surface of the base 27 is provided with a tensile spring 29, and the outer side of the rear surface of the rotating seat 23 is provided with a stress plate 30.

[0032] When too many large-particle impurities in seawater are attached to the filter screen 16, the first on-off valve 13 is closed, the second on-off valve 15 is opened, and then the pressurizing valve 21 is started, so that the cleaning liquid flows into the cleaning seat 17 from the cleaning water tank 22 through the first water injection pipe 19 and the second water injection pipe 20, the pressurized water flow in the second water injection pipe 20 flows into the rotating seat 23 and is sprayed out through the cleaning nozzle 26, the pressurized water flow in the first water injection pipe 19 drives the rotating seat 23 and the cleaning nozzle 26 on the front surface of the rotating seat 23 to rotate and spray water by impacting the stress plate 30, the high-pressure water flow sprayed out by the cleaning nozzle 26 is diffused and washed from the center to the outer ring of the filter screen 16 under the action of centrifugal force and the tensile spring 29, so that all the large-particle impurities attached to the filter screen 16 are washed down and discharged through the blowdown pipe 14, this cleaning mode does not need to disassemble the filter screen 16, is more convenient to operate, saves time and effort, and the filter screen 16 can reduce the large-particle impurities entering the plate heat exchanger 1, so that the plate heat exchanger 1 can efficiently perform water vapor condensation work. Example two

[0033] On the basis of example one in order to facilitate the installation of water pipe 9 to the surface of plate heat exchanger 1, mounting seat 2 is fixedly connected to the front surface of plate heat exchanger 1, the telescopic groove 3 opened in the inner side of mounting seat 2 is in cylindrical structure, the limiting column 4 is slidingly connected with the telescopic groove 3, one end of the limiting spring 5 is fixedly connected to the surface of telescopic groove 3, the other end of the limiting spring 5 is fixedly connected to the middle segment of limiting column 4, the limiting seat 6 is slidingly connected with the surface of mounting seat 2, the two ends of limiting seat 6 are slidingly connected with the limiting threaded rod 7, the limiting nut 8 is threadedly connected with the limiting threaded rod 7, the mounting flange 10 is fixedly connected to the end of water pipe 9, the limiting groove 11 opened in the outer side of the rear surface of mounting flange 10 is in cylindrical structure, the sealing ring 12 is fixedly connected to the front surface of mounting flange 10;

[0034] When the water pipe 9 is to be installed on the plate heat exchanger 1, the mounting flange 10 is inserted into the mounting seat 2, the fillet on the outer side of the front surface of mounting flange 10 can press the limiting column 4 into the telescopic groove 3, when the sealing ring 12 on the front surface of mounting flange 10 is tightly attached to the inner surface of mounting seat 2, under the action of limiting spring 5, the front end of limiting column 4 is clamped into the limiting groove 11 to limit the end of water pipe 9 in mounting seat 2, then the limiting seat 6 is slid to limit the limiting column 4 in the limiting groove 11 by the inner surface of limiting seat 6, finally the limiting nut 8 on the surface of limiting threaded rod 7 makes the limiting seat 6 unable to slide, so as to fix the water pipe 9 on the plate heat exchanger 1, this installation method is simple, convenient and fast. Example three

[0035] On the basis of example two in order to facilitate the cleaning of filter screen 16, the first switch valve 13 is fixedly connected to the rear segment of water pipe 9, the blowdown pipe 14 is fixedly connected to the lower surface of water pipe 9, the second switch valve 15 is fixedly connected to the middle segment of blowdown pipe 14, the filter screen 16 is fixedly connected to the inner surface of water pipe 9, the cleaning seat 17 is fixedly connected to the inner surface of water pipe 9, the backflow pipe 18 is fixedly connected to the lower surface of cleaning seat 17, the other end of backflow pipe 18 is fixedly connected to the surface of cleaning water tank 22, the first water injection pipe 19 is fixedly connected to the upper surface of cleaning seat 17, the second water injection pipe 20 is fixedly connected to the rear surface of cleaning seat 17, the upper end of first water injection pipe 19 and second water injection pipe 20 is fixedly connected to the end of pressurizing valve 21, the rotating seat 23 is rotationally connected with cleaning seat 17, the adjusting seat 24 is fixedly connected to the inner front surface of rotating seat 23, the water injection head 25 is movably connected with adjusting seat 24, the cleaning nozzle 26 is fixedly connected to the front surface of water injection head 25, the base 27 is fixedly connected to the front surface of rotating seat 23, the base 27 is rotationally connected with stabilizing shaft 28, the stabilizing shaft 28 is fixedly connected to the inner surface of cleaning seat 17, one end of the tensile spring 29 is fixedly connected to the surface of base 27, the other end of the tensile spring 29 is fixedly connected to the lower surface of cleaning nozzle 26, the stress plate 30 is fixedly connected to the outer side of rear surface of rotating seat 23.

[0036] When too many large particles in seawater are attached to the filter screen 16, first close the first switch valve 13 of the water pipe 9, then open the second switch valve 15 of the drain pipe 14, and then start the pressurizing valve 21, so that the cleaning liquid flows into the cleaning seat 17 from the cleaning water tank 22 through the first water injection pipe 19 and the second water injection pipe 20. The pressurized water flow in the second water injection pipe 20 flows into the water injection end head 25 on the front surface of the rotating seat 23 and is sprayed out by the cleaning nozzle 26. The pressurized water flow in the first water injection pipe 19 drives the rotating seat 23 and the cleaning nozzle 26 on the front surface of the rotating seat 23 to rotate and spray water by impacting the force plate 30. The return pipe 18 can return the cleaning liquid flowing out of the first water injection pipe 19 into the cleaning water tank 22 for repeated use. The cleaning nozzle 26 sprays high-pressure water flow to wash the filter screen 16 from the center to the outer ring under the action of centrifugal force and the stretching spring 29. The adjusting seat 24 can ensure that the cleaning nozzle 26 can be adjusted with the change of force, so that all the large particles attached to the filter screen 16 are washed down and discharged through the drain pipe 14. The stable shaft 28 in the base 27 can ensure that the rotating seat 23 and the cleaning nozzle 26 rotate more stably. This cleaning method does not need to disassemble the filter screen 16, and the operation is more simple, time-saving and labor-saving. Moreover, the filter screen 16 can reduce the entry of large particles into the plate heat exchanger 1, so as to ensure that the plate heat exchanger 1 can efficiently perform water vapor condensation work.

[0037] Working principle: When too many large particles in seawater are attached to the filter screen 16, first close the first switch valve 13, then open the second switch valve 15, and then start the pressurizing valve 21, so that the cleaning liquid flows into the cleaning seat 17 from the cleaning water tank 22 through the first water injection pipe 19 and the second water injection pipe 20. The pressurized water flow in the second water injection pipe 20 flows into the rotating seat 23 and is sprayed out by the cleaning nozzle 26. The pressurized water flow in the first water injection pipe 19 drives the rotating seat 23 and the cleaning nozzle 26 on the front surface of the rotating seat 23 to rotate and spray water by impacting the force plate 30. The cleaning nozzle 26 sprays high-pressure water flow to wash the filter screen 16 from the center to the outer ring under the action of centrifugal force and the stretching spring 29, so that all the large particles attached to the filter screen 16 are washed down and discharged through the drain pipe 14. This cleaning method does not need to disassemble the filter screen 16, and the operation is more simple, time-saving and labor-saving. Moreover, the filter screen 16 can reduce the entry of large particles into the plate heat exchanger 1, so as to ensure that the plate heat exchanger 1 can efficiently perform water vapor condensation work. In this way, the problem that the traditional marine water-cooled heat exchanger generally uses seawater with a lower input temperature to condense water vapor, and the large particles in the seawater may block the pipeline or adhere to the metal sheet surface for heat exchange in the water-cooled heat exchanger, thereby reducing the efficiency of the water-cooled heat exchanger to condense fresh water, and the large particles may also affect the normal work of the water-cooled heat exchanger, is avoided.

[0038] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions and variations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A water circulation system for a marine water-cooled heat exchanger, characterized in that: The water circulation system of the ship's water-cooled heat exchanger includes: a plate heat exchanger (1), a mounting seat (2) is provided on the front surface of the plate heat exchanger (1), an expansion groove (3) is provided on the side inside the mounting seat (2), a limit post (4) is provided in the expansion groove (3), a limit spring (5) is sleeved on the rear section of the limit post (4), a limiting seat (6) is sleeved on the outer surface of the mounting seat (2), the two ends of the limiting seat (6) are sleeved on the surface of the limiting threaded rod (7), and a limiting nut (8) is provided on the surface of the limiting threaded rod (7). A water supply pipe (9) is provided at the end of the water supply pipe (9). A limit groove (11) is opened on the outer side of the rear surface of the installation flange (10). A sealing ring (12) is provided on the front surface of the installation flange (10). A first switch valve (13) is provided at the rear section of the water supply pipe (9). A sewage pipe (14) is provided on the lower surface of the water supply pipe (9). A second switch valve (15) is provided in the middle section of the sewage pipe (14). A filter screen (16) is provided inside the water supply pipe (9). A cleaning seat (17) is provided on the front side of the filter screen (16). A cleaning seat (17) is provided with a return pipe (18) on its lower surface, a first water injection pipe (19) on its upper surface, and a second water injection pipe (20) on its rear surface. The upper ends of the first water injection pipe (19) and the second water injection pipe (20) are located at the end of a pressure valve (21). A cleaning water tank (22) is located at the rear end of the pressure valve (21). A rotating seat (23) is provided inside the cleaning seat (17). An adjusting seat (24) is provided inside the front surface of the rotating seat (23). A water injection end (25) is provided inside the adjusting seat (24). A cleaning nozzle (26) is provided on the front surface of the water injection end (25). A base (27) is provided on the front surface of the rotating seat (23). A stabilizing shaft (28) is provided inside the base (27). A surface of the base (27) is provided with... There is a tension spring (29), and a force plate (30) is provided on the outer side of the rear surface of the rotating seat (23); the rotating seat (23) is rotatably connected to the cleaning seat (17), the adjusting seat (24) is fixedly connected to the inner surface of the front surface of the rotating seat (23), the water injection end (25) is movably connected to the adjusting seat (24), and the cleaning nozzle (26) is fixedly connected to the front surface of the water injection end (25); the base (27) is fixedly connected to the front surface of the rotating seat (23), the base (27) is rotatably connected to the stabilizing shaft (28), the stabilizing shaft (28) is fixedly connected to the inner surface of the cleaning seat (17), one end of the tension spring (29) is fixedly connected to the surface of the base (27), the other end of the tension spring (29) is fixedly connected to the lower surface of the cleaning nozzle (26), and the force plate (30) is fixedly connected to the outer side of the rear surface of the rotating seat (23).

2. A water circulation system for a marine water-cooled heat exchanger according to claim 1, characterized in that: The mounting base (2) is fixedly connected to the front surface of the plate heat exchanger (1), and the expansion groove (3) opened on the inner side of the mounting base (2) is cylindrical.

3. A water circulation system for a marine water-cooled heat exchanger according to claim 1, characterized in that: The limiting post (4) is slidably connected to the telescopic groove (3), one end of the limiting spring (5) is fixedly connected to the surface of the telescopic groove (3), and the other end of the limiting spring (5) is fixedly connected to the middle section of the limiting post (4).

4. A water circulation system for a marine water-cooled heat exchanger according to claim 1, characterized in that: The limiting seat (6) is slidably connected to the surface of the mounting seat (2), the two ends of the limiting seat (6) are slidably connected to the limiting threaded rod (7), and the limiting nut (8) is threadedly connected to the limiting threaded rod (7).

5. A water circulation system for a marine water-cooled heat exchanger according to claim 1, characterized in that: The mounting flange (10) is fixedly connected to the end of the water pipe (9). The limiting groove (11) opened on the outer side of the rear surface of the mounting flange (10) has a columnar structure, and the sealing ring (12) is fixedly connected to the front surface of the mounting flange (10).

6. A water circulation system for a marine water-cooled heat exchanger according to claim 1, characterized in that: The first switch valve (13) is fixedly connected to the rear section of the water supply pipe (9), the sewage pipe (14) is fixedly connected to the lower surface of the water supply pipe (9), the second switch valve (15) is fixedly connected to the middle section of the sewage pipe (14), and the filter screen (16) is fixedly connected to the inner surface of the water supply pipe (9).

7. A water circulation system for a marine water-cooled heat exchanger according to claim 1, characterized in that: The cleaning seat (17) is fixedly connected to the inner surface of the water supply pipe (9), the return pipe (18) is fixedly connected to the lower surface of the cleaning seat (17), the other end of the return pipe (18) is fixedly connected to the surface of the cleaning water tank (22), the first water injection pipe (19) is fixedly connected to the upper surface of the cleaning seat (17), the second water injection pipe (20) is fixedly connected to the rear surface of the cleaning seat (17), and the upper ends of the first water injection pipe (19) and the second water injection pipe (20) are fixedly connected to the end of the pressure valve (21).

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