A low-noise marine cooling water system

Abstract

This invention discloses a low-noise marine cooling water system, belonging to the field of marine vibration reduction and noise reduction technology. It includes a diversion mechanism, a cooling water pump, a heat exchanger, a drain outlet, and a delivery pipe. The diversion mechanism is a tubular structure extending from the hull's outer wall, including a diversion port perpendicular to the hull and facing the bow. The heat exchanger includes a first heat exchange mechanism and a second heat exchange mechanism, with the cooling water pump positioned between them. The drain outlet is located on the hull. The diversion mechanism, cooling water pump, heat exchanger, and drain outlet are all located on the delivery pipe. This invention provides a low-noise marine cooling water system that significantly improves the uniformity and stability of the flow field within the pipe, enabling noise reduction and flow stabilization at both the inlet and outlet of the cooling water pump. This suppresses the flow noise generated by the cooling water pump and noise transmission, significantly reducing the noise level of the marine cooling water system.

Description

Technical Field

[0001] This invention belongs to the field of ship vibration reduction and noise reduction technology, specifically relating to a low-noise ship cooling water system for sea passage. Background Technology

[0002] To ensure the cooling needs of a ship's propulsion system, ships typically require a sea-through cooling water system. This system circulates seawater from outside the ship to provide sufficient cooling medium and capacity for various heat source equipment. However, due to the large pipe diameter, it is difficult to implement effective noise reduction measures for pump and pipe flow noise in these systems. Furthermore, because they connect to numerous propulsion devices, the sea-through cooling water system constitutes a significant transmission path for ship mechanical noise. Therefore, it often becomes a key area for radiated noise from ships.

[0003] In existing technologies, to reduce the adverse effects of sea-entry cooling water systems on the acoustic performance of ships, various cooling systems often employ gravity-flow circulation technology to improve noise levels. The biggest noise reduction advantage of gravity-flow circulation is that it avoids vibration noise from the cooling water pump within a certain speed range. However, to ensure low flow resistance in the cooling system, gravity-flow circulation also introduces certain noise disadvantages: firstly, the cooling system piping must maintain a large diameter, leading to an increase in the noise radiation area at the sea entrance; secondly, it is difficult to install flow-stabilizing components with high flow resistance within the cooling system, easily resulting in increased flow noise; and thirdly, under low flow resistance conditions, the space for improving the noise level of the cooling water pump is limited. Furthermore, the cooling water system is not entirely free of pump noise in gravity-flow mode. The rotation of the cooling water pump impeller under the impact of the water flow inside the pipe also generates impeller rotation noise. At lower or higher ship speeds, gravity-flow circulation often cannot meet the required cooling water flow rate, and sufficient cooling water still needs to be provided through "pump flow."

[0004] Furthermore, in the traditional layout of marine cooling water systems, the main equipment components such as the sea passage valve, cooling water pump, and heat exchanger are usually connected in series. This layout usually makes it difficult to ensure the uniformity and stability of the flow field in the system pipeline, which leads to high cooling water pump noise and pipeline flow noise, and it is easy to radiate to the outside of the ship through the sea passage. Summary of the Invention

[0005] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a low-noise marine cooling water system that can significantly improve the uniformity and stability of the flow field in the pipe, so that both the inlet and outlet ends of the cooling water pump can be silencing and stabilized, thereby suppressing the flow noise generated by the cooling water pump and the noise transmission, and greatly reducing the noise level of the marine cooling water system.

[0006] To achieve the above objectives, the present invention provides a low-noise marine sea-vented cooling water system for connecting seawater outside the hull to provide cooling for internal equipment or fluid media, comprising:

[0007] The diversion mechanism is a tubular diversion structure extending from the outer wall of the hull, including a diversion port that is perpendicular to the hull and faces the bow of the hull; and the diversion mechanism is configured such that, as the hull moves, seawater flows into the diversion mechanism to form cooling water and generate a dynamic pressure load.

[0008] A cooling water pump, which drives the cooling water to circulate.

[0009] A heat exchanger, comprising a first heat exchange mechanism and a second heat exchange mechanism, is used to cool the working fluid inside the ship using cooling water; a cooling water pump is disposed between the first heat exchange mechanism and the second heat exchange mechanism to drive the cooling water into the heat exchanger;

[0010] A drain outlet is provided on the hull for discharging the cooling water outside the hull after cooling is complete.

[0011] The conveying pipeline, the diversion mechanism, the cooling water pump, the heat exchanger and the drain outlet are all installed on the conveying pipeline.

[0012] As a further preferred embodiment of the present invention, the inlet of the cooling water pump is connected to the first heat exchange mechanism; the outlet of the cooling water pump is connected to the second heat exchange mechanism, for suppressing the transmission of noise from the cooling water pump simultaneously at the inlet and the outlet.

[0013] As a further preferred embodiment of the present invention, the first heat exchange mechanism and the second heat exchange mechanism are independent heat exchangers; or the first heat exchange mechanism and the second heat exchange mechanism are two components of the same heat exchanger separated by a partition.

[0014] As a further preferred embodiment of the present invention, the first heat exchange mechanism and the second heat exchange mechanism are independent heat exchangers;

[0015] The first heat exchange mechanism includes a first inlet, a first outlet, and a first heat exchange tube disposed between the two; the first inlet is connected to the diversion mechanism; and the first outlet is connected to the inlet.

[0016] As a further preferred embodiment of the present invention, the second heat exchange mechanism includes a second water inlet, a second water outlet, and a second heat exchange tube; the second water inlet is connected to the outlet, and the second water outlet is connected to the drain outlet;

[0017] The second inlet and the second outlet are located at one end of the second heat exchange tube, and a turning water chamber is located at the other end of the second heat exchange tube;

[0018] Alternatively, the second heat exchange tube may be disposed between the second inlet and the second outlet.

[0019] As a further preferred embodiment of the present invention, the first heat exchange mechanism and the second heat exchange mechanism are two components of the same heat exchanger separated by a partition.

[0020] The first heat exchange mechanism includes a first water inlet, a first water outlet, and a first heat exchange tube; the second heat exchange mechanism includes a second water inlet, a second water outlet, and a second heat exchange tube.

[0021] One end of the heat exchanger is provided with a first water inlet and a second water outlet in sequence, and the other end of the heat exchanger is provided with a first water outlet and a second water inlet in sequence; the heat exchanger is separated from the first heat exchange tube and the second heat exchange tube that are parallel to each other by a partition.

[0022] As a further preferred embodiment of the present invention, both the first heat exchange mechanism and the second heat exchange mechanism should be designed with noise reduction performance to suppress the transmission of the cooling water pump's noise, specifically targeting the shaft frequency noise and blade frequency noise.

[0023] As a further preferred embodiment of the present invention, the cooling water pump is a positive displacement pump, an impeller pump, or a jet pump.

[0024] As a further preferred embodiment of the present invention, part or all of the conveying pipeline is a vibration-damping pipe.

[0025] As a further preferred embodiment of the present invention, the conveying pipeline is connected to at least one of the diversion mechanism, the cooling water pump, the heat exchanger and the drain outlet by a flange.

[0026] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0027] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include:

[0028] (1) The low-noise marine cooling water system of the present invention connects heat exchangers to both the inlet and outlet of the cooling water pump. By utilizing the flow stabilization effect of the heat exchangers, the stability and uniformity of the flow field at the inlet of the cooling water pump can be effectively improved, which is beneficial to reducing the noise of the cooling water pump. By utilizing the noise reduction effect of the heat exchangers, the transmission of pump noise can be suppressed in both the inlet and outlet pipes of the cooling water, thereby significantly reducing the noise level of the marine cooling water system.

[0029] (2) The low-noise marine cooling water system of the present invention sets the inlet and outlet of the heat exchanger on the same side, thereby changing the commonly used single-pass heat exchanger of the marine cooling water system to a double-pass heat exchanger. Under the condition of meeting the same heat exchange, the cooling water flow requirement can be reduced, thereby reducing the diameter of the conveying pipe. This is beneficial to reducing the noise radiation area of ​​the cooling water system at the sea outlet and improving the vibration reduction performance of the vibration damping pipe in the conveying pipe, thereby reducing the radiation noise of the cooling water.

[0030] (3) The low-noise marine cooling water system of the present invention, by combining a diversion mechanism set at the inlet of the cooling water system, enables the cooling water to automatically enter the cooling water system with the movement of the ship, reducing the power required by the cooling water pump during actual operation and improving the back pressure environment of the cooling water pump. It can not only reduce the noise disadvantage generated by gravity circulation, but also effectively reduce the noise level of the cooling water pump itself, thereby greatly reducing the actual operating noise of the marine cooling water system. It has good prospects for promotion and application value. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the low-noise marine cooling water system in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the overall structure of a low-noise marine cooling water system according to another embodiment of the present invention.

[0033] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0034] 1. Diversion mechanism; 2. Conveying pipeline; 3. First heat exchange mechanism; 4. Cooling water pump; 5. Second heat exchange mechanism; 6. Drain outlet; 7. Hull; 8. Port flange; 21. First pipeline; 22. Second pipeline; 23. Third pipeline; 24. Fourth pipeline; 31. First heat exchange tube; 32. First inlet; 33. First outlet; 51. Second heat exchange tube; 52. Second inlet; 53. Second outlet; 54. Diverting water chamber. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] Example:

[0041] Please see Figure 1 and Figure 2The low-noise marine cooling water system in the preferred embodiment of this application can significantly improve the uniformity and stability of the flow field inside the pipe, so that both the inlet and outlet of the cooling water pump 4 can be silencing and stabilized, thereby suppressing the flow noise and noise transmission generated by the cooling water pump 4 and greatly reducing the noise level of the marine cooling water system.

[0042] Specifically, in a preferred embodiment of this application, the low-noise marine cooling water system can connect to seawater outside the hull 7, using the seawater outside the hull 7 as a cooling medium to achieve rapid cooling of internal equipment or fluid media. The cooling water system includes a diversion mechanism 1, a cooling water pump 4, a heat exchanger, and a drain outlet 6. The diversion mechanism 1 is a tubular diversion structure extending from the outer wall of the hull 7, including a diversion port. Preferably, the diversion port is perpendicular to the hull and faces the bow of the hull 7, allowing some seawater to automatically flow into the cooling water system through the diversion port as the hull 7 moves. That is, the seawater already possesses a certain kinetic energy upon entering the cooling water system, making it easier for the seawater to flow within the system. The cooling water pump 4 is used to drive the cooling water in the cooling water system to circulate. Since the diversion mechanism 1 allows seawater to enter the cooling water system and form cooling water, it already has a certain kinetic energy. Under the condition that the fluid pressure in the cooling system is constant, the cooling water pump 4 can combine the existing kinetic energy of the cooling water to reduce the operating power of the cooling water pump 4 and significantly reduce the noise present during the operation of the cooling water pump 4.

[0043] The heat exchanger includes a first heat exchange mechanism 3 and a second heat exchange mechanism 5. Through heat exchange between the cooling water flowing in the first and second heat exchange mechanisms 3 and 5 and the working fluid inside the hull 7, rapid cooling of the working fluid inside the hull 7 is achieved. Simultaneously, to reduce noise at the inlet and outlet of the cooling water pump 4, both ends of the cooling water pump 4 are connected to the first heat exchange mechanism 3 and the second heat exchange mechanism 5, respectively. In actual use, by setting the first heat exchange mechanism 3 and the second heat exchange mechanism 5 at both ends of the cooling water pump 4, not only can the excellent flow stabilization and noise reduction characteristics of the first and second heat exchange mechanisms 3 and 5 improve the noise in the cooling water system, but the flow field at the inlet and outlet of the cooling water pump 4 is also made more uniform and stable, further reducing the noise during the operation of the cooling water pump 4, and also reducing the flow noise generated by the cooling water in the cooling water system.

[0044] The drain outlet 6 is located on the hull 7 of the vessel and is used to transport the cooled water that has undergone heat exchange in the cooling water system to the outside of the hull 7. Simultaneously, the diversion mechanism 1, cooling water pump 4, heat exchanger, and drain outlet 6 are all located on the delivery pipe 2, facilitating stable communication between the various components of the cooling water system and ensuring efficient and stable cooling of the hull 7 by the cooling water system. Preferably, the delivery pipe 2 includes a first pipe 21, a second pipe 22, a third pipe 23, and a fourth pipe 24, used to connect the various components of the cooling water system.

[0045] Furthermore, in a preferred embodiment of this application, the cooling water pump 4 includes an inlet and an outlet. The inlet is connected to the first heat exchange mechanism 3 via a second pipe 22. The first heat exchange mechanism 3, located upstream of the cooling water pump 4, improves the stability and uniformity of the inlet cooling water flow field, reduces the noise generated during the operation of the cooling water pump 4, and rapidly attenuates the noise transmission of the cooling water pump along the inlet end pipe. Correspondingly, the outlet is connected to the second heat exchange mechanism 5 via a third pipe 23, which reduces fluid pulsation in the outlet end pipe of the cooling water pump 4, suppresses the noise from the cooling water system drain outlet, and rapidly attenuates the noise transmission of the cooling water pump along the outlet end pipe. This reduces the noise generated during the operation of the cooling water pump 4 and confines the cooling water pump noise within the cooling water system, significantly reducing the noise radiation generated by the cooling water pump noise transmitted along the delivery pipe 2 to the outside of the hull 7.

[0046] Furthermore, in a preferred embodiment of this application, the heat exchanger includes a first heat exchange mechanism 3 and a second heat exchange mechanism 5, and the first heat exchange mechanism 3 and the second heat exchange mechanism 5 can be independent heat exchangers.

[0047] Specifically, the first heat exchange mechanism 3 is a single-pass heat exchanger, including a first heat exchange tube 31 and a first inlet 32 ​​and a first outlet 33 disposed at both ends of the first heat exchange tube 31. The first inlet 32 ​​is connected to the diversion mechanism 1 through a first pipe 21, and the first outlet 33 is connected to the inlet of the cooling water pump 4 through a second pipe 22, so that cooling water flows into the cooling water pump 4 after passing through the first heat exchange tube 31. Correspondingly, the second heat exchange mechanism 5 includes a second heat exchange tube 51, a second inlet 52, a second outlet 53, and a turning water chamber 54. The second inlet 52 and the second outlet 53 are arranged on the same side of one end of the second heat exchange tube 51 and separated by a partition. The turning water chamber 54 is arranged on the other side of the second heat exchange tube 51. The second inlet 52 is connected to the outlet of the cooling water pump 4 via a third pipe 23, and the second outlet 53 is connected to the drain outlet 6 via a fourth pipe 24. This allows the cooling water driven by the cooling water pump 4 to be stabilized and silenced by the second heat exchange mechanism 5, further reducing noise in the cooling water system. Alternatively, the second exchange mechanism 5 can be a single-pass heat exchanger, with the first inlet 32 ​​and the first outlet 33 located at both ends of the first heat exchange tube 31.

[0048] Furthermore, in a preferred embodiment of this application, the first heat exchange mechanism 3 is an auxiliary heat exchanger of the cooling water system, undertaking a smaller portion of the cooling capacity of the cooling water system, and the second heat exchanger 5 is the main heat exchanger of the cooling water system, undertaking a larger portion of the cooling capacity of the cooling water system. The second inlet 52 and the second outlet 53 of the second heat exchange mechanism 5 are located on one side of the second heat exchange tube 51, while a turning water chamber 54 is located on the other side of the second heat exchange tube 51. This reduces the cooling water flow requirement of the second heat exchange mechanism 5 when exchanging the same amount of heat. This not only reduces the diameter of the conveying pipe 2, thereby reducing the noise radiation area of ​​the outlet and lowering the radiated noise, but also reduces the required flow rate of the cooling water pump 4, further reducing the driving power of the cooling water pump 4, and thus greatly reducing the noise of the cooling water system.

[0049] Preferably, the first water inlet and the first pipe 21 are connected by a port flange 8 for limiting. More preferably, each pipe is connected to the diversion mechanism 1, the cooling water pump 4, the first heat exchange mechanism 3, the second heat exchange mechanism 5, and the drain outlet 6 by a port flange 8 for limiting. More preferably, a sealing gasket is provided at the joint surface of the port flange 8 to ensure the sealing of the port flange 8 connection.

[0050] Of course, such as Figure 2As shown, the heat exchanger is not limited to the above-described form. In another preferred embodiment of this application, the heat exchanger is divided into two parts by a partition, namely a first heat exchange mechanism 3 and a second heat exchange mechanism 5. The first heat exchange mechanism 3 and the second heat exchange mechanism 5 are also provided with a first inlet 32, a second inlet 52, a first outlet 33, and a second outlet 53, and are respectively connected to other components of the cooling water system through conveying pipes 2. This not only enables noise suppression and reduction in the entire cooling water system by correspondingly setting the first heat exchange mechanism 3 and the second heat exchange mechanism 5 at the inlet and outlet positions of the cooling water pump 4, but also significantly reduces the space occupied by the heat exchanger, thereby significantly improving the applicability of the cooling water system.

[0051] In addition, in another preferred embodiment of this application, the heat exchanger is actually a dual-flow heat exchanger, with its inlet being the first inlet 32 ​​and its outlet being the second outlet 53. The first inlet 32 ​​and the second outlet 53 are arranged sequentially on one side of the heat exchanger and separated by a partition. The first outlet 33 and the second inlet 52 are arranged sequentially on the other side of the heat exchanger and separated by a partition. The heat exchanger forms a first heat exchange tube 31 and a second heat exchange tube 51 arranged sequentially through the partition, and the first heat exchange tube 31 and the second heat exchange tube 51 are parallel.

[0052] Furthermore, the first outlet 33 is connected to the inlet of the cooling water pump 4 through the delivery pipe 22, and the second inlet 52 is connected to the outlet of the cooling water pump through the delivery pipe 23. The cooling water medium enters the first heat exchange tube 31 from the first inlet 32, and is then pumped by the cooling water pump 4 through the first outlet 33 to the second inlet 52, enters the second heat exchange tube 51, and finally flows out of the heat exchanger from the second outlet 53. Compared with the single-pass heat exchanger commonly used in traditional cooling water systems, it can also reduce the cooling water flow requirements of the cooling water system under the same heat exchange, thereby reducing the noise of the cooling water system.

[0053] Furthermore, in a preferred embodiment of this application, to further reduce noise in the cooling water system, both the first heat exchange mechanism 3 and the second heat exchange mechanism 5 should be designed with sound-absorbing structures to reduce noise in the cooling water system. Preferably, at least one of the first heat exchange mechanism 3 and the second heat exchange mechanism 5 is provided with a sound-absorbing structure to reduce noise in the cooling water system. Preferably, the characteristic frequencies such as the shaft frequency and impeller frequency of the cooling water pump 4 should be within the effective sound-absorbing frequency band of the first heat exchange mechanism 3 and the second heat exchange mechanism 5.

[0054] Furthermore, in a preferred embodiment of this application, the cooling water pump 4 is a positive displacement pump, an impeller pump, or a jet pump.

[0055] More preferably, in a preferred embodiment of this application, part or all of the conveying pipe 2 is a vibration-damping pipe, used to further reduce vibration in the cooling water system.

[0056] The low-noise marine cooling water system of this invention features a stable structure, excellent noise reduction, and ease of use. By distributing a first heat exchange mechanism 3 and a second heat exchange mechanism 5 at the inlet and outlet of the cooling water pump 4, it achieves uniform flow field at both locations, effectively attenuating noise transmission and reducing the noise generated by the pump. Simultaneously, the inclusion of a diversion mechanism 1 at the cooling water system inlet allows cooling water to automatically enter the system with the ship's movement, reducing the power required for the cooling water pump 4's actual operation and improving its back pressure environment. This not only reduces the noise disadvantage caused by gravity circulation but also effectively lowers the pump's own noise level, significantly reducing the actual operating noise of the low-noise marine cooling water system. It has promising prospects for widespread application and significant practical value.

[0057] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A low-noise marine sea-vented cooling water system, used to connect seawater outside the hull to provide cooling for internal equipment or fluid media, characterized in that, include: The diversion mechanism is a tubular diversion structure extending from the outer wall of the hull, including a diversion port that is perpendicular to the hull and faces the bow of the hull; and the diversion mechanism is configured such that, as the hull moves, seawater flows into the diversion mechanism to form cooling water and generate a dynamic pressure load. A cooling water pump, which drives the cooling water to circulate. The heat exchanger includes a first heat exchange mechanism and a second heat exchange mechanism, used to cool the working fluid inside the ship through cooling water; the first heat exchange mechanism is an auxiliary exchanger of the cooling water system, used to undertake a small part of the cooling capacity of the cooling system, and the second heat exchange mechanism is the main exchanger of the cooling water system, used to undertake a large part of the cooling capacity of the cooling system. Furthermore, both the first heat exchange mechanism and the second heat exchange mechanism should be designed to reduce the shaft frequency noise and blade frequency noise of the cooling water pump. At least one of the first heat exchange mechanism and the second heat exchange mechanism should be equipped with a noise reduction structure to suppress the transmission of the cooling water pump noise. The characteristic frequency of the cooling water pump is within the effective noise reduction frequency band of the first heat exchange mechanism and the second heat exchange mechanism. The cooling water pump is disposed between the first heat exchange mechanism and the second heat exchange mechanism, and is used to drive the cooling water into the heat exchanger; The inlet of the cooling water pump is connected to the first heat exchange mechanism; the outlet of the cooling water pump is connected to the second heat exchange mechanism, which is used to suppress the transmission of the cooling water pump noise at both the inlet and the outlet. A drain outlet is provided on the hull for discharging the cooling water outside the hull after cooling is complete. The conveying pipeline, the diversion mechanism, the cooling water pump, the heat exchanger and the drain outlet are all installed on the conveying pipeline; and part or all of the conveying pipeline is a vibration-damping connector; The first heat exchange mechanism and the second heat exchange mechanism are independent heat exchangers; The first heat exchange mechanism includes a first inlet, a first outlet, and a first heat exchange tube disposed between the two; the first inlet is connected to the diversion mechanism; the first outlet is connected to the inlet. The second heat exchange mechanism includes a second inlet, a second outlet, and a second heat exchange tube; the second inlet is connected to the outlet, and the second outlet is connected to the drain outlet. The second inlet and the second outlet are located at one end of the second heat exchange tube, and a turning water chamber is located at the other end of the second heat exchange tube.

2. The low-noise marine cooling water system according to claim 1, wherein, The first heat exchange mechanism and the second heat exchange mechanism are two components of the same heat exchanger separated by a partition. The first heat exchange mechanism includes a first water inlet, a first water outlet, and a first heat exchange tube; the second heat exchange mechanism includes a second water inlet, a second water outlet, and a second heat exchange tube. One end of the heat exchanger is provided with a first water inlet and a second water outlet in sequence, and the other end of the heat exchanger is provided with a first water outlet and a second water inlet in sequence. The heat exchanger is separated from the first and second heat exchange tubes, which are parallel to each other, by a partition.

3. The low-noise marine cooling water system according to claim 1 or 2, wherein, The cooling water pump is a positive displacement pump, an impeller pump, or a jet pump.

4. The low-noise marine cooling water system according to claim 1 or 2, wherein, The delivery pipeline is connected to at least one of the following: the diversion mechanism, the cooling water pump, the heat exchanger, and the drain outlet, by a flange.

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