Cooling water system for diesel engine and using method

Abstract

The invention discloses a cooling water system for a diesel engine and a using method, and belongs to the technical field of diesel engines. The preheating unit comprises a heating module and a booster pump, an outlet of the expansion water tank communicates with an inlet of the booster pump, an outlet of the booster pump is used for guiding cooling water into a waterway inlet of an air cylinder in the diesel engine, and an inlet of the expansion water tank communicates with a waterway outlet of the air cylinder in the diesel engine; the fresh water cooling unit comprises a water temperature regulator and a water cooler, an inlet of the water temperature regulator is communicated with a waterway outlet of an air cylinder in the diesel engine, a first outlet of the water temperature regulator and the water cooler are communicated with an inlet of the booster pump, and a second outlet of the water temperature regulator is communicated with an inlet of the booster pump. According to the cooling water system for the diesel engine, the air cylinder in the diesel engine can be rapidly preheated before the diesel engine is started, and fresh water can be fully cooled in the working process of the diesel engine.

Description

Technical Field

[0001] This invention belongs to the field of diesel engine technology, specifically relating to a cooling water system for diesel engines and its usage method. Background Technology

[0002] The function of the cooling water system is to properly cool the components, engine oil, hydraulic transmission oil, and turbocharged air (mainly cylinders) of the diesel engine that operate under high-temperature conditions, so that these components can operate at the allowable and optimal temperature, maintain the normal working viscosity and performance of the engine oil, ensure the diesel engine outputs the specified power, and improve the performance, durability, and reliability of the diesel engine.

[0003] However, in winter, especially in frigid regions, the cooling water inside diesel engines is prone to freezing, which makes it difficult to start the cylinders directly. Most existing diesel engines lack certain preheating measures before starting, or they preheat the engine by heating the cooling water through heat transfer, resulting in a slow cooling water temperature rise and an inability to quickly preheat the cooling water, thus affecting the starting speed of the diesel engine. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a cooling water system and method for use in diesel engines. Its purpose is to not only quickly preheat the cylinders in the diesel engine before starting the diesel engine, thereby improving the starting efficiency of the diesel engine, but also to achieve sufficient cooling of fresh water during the operation of the diesel engine, thus ensuring the working performance of the diesel engine.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a cooling water system for a diesel engine, the cooling water system comprising an expansion tank, a preheating unit, and a freshwater cooling unit; The expansion tank is filled with fresh water and is located outside the diesel engine. The preheating unit includes a heating module and a booster pump. The fixed end of the heating module is located on the body of the expansion tank, and the heating end of the heating module is located at the bottom of the expansion tank to heat fresh water. The outlet of the expansion tank is connected to the inlet of the booster pump. The outlet of the booster pump is used to introduce fresh water into the water inlet of the cylinder of the diesel engine. The inlet of the expansion tank is used to connect to the water outlet of the cylinder of the diesel engine. The freshwater cooling unit includes a water temperature regulator and a water cooler. The inlet of the water temperature regulator is used to connect to the water outlet of the cylinder in the diesel engine. The first outlet of the water temperature regulator, the water cooler, and the inlet of the booster pump are connected in sequence. The second outlet of the water temperature regulator is connected to the inlet of the booster pump.

[0006] Optionally, the cooling water system further includes a control component, which includes a sensor module, an AC power supply, and a data processing controller. The sensor module is used to measure the performance parameters of the fresh water in the expansion tank in real time. The AC power supply is electrically connected to the heating end of the heating module. The data processing controller is electrically connected to both the sensor module and the AC power supply to control the performance parameters of the fresh water within a set range by adjusting the current of the AC power supply.

[0007] Optionally, the sensor module is inserted into the fixed end of the heating module.

[0008] Optionally, the heating module includes a support base and a heating rod. The support base is inserted into the body of the expansion tank, one end of the heating rod is inserted into the support base, and the other end of the heating rod is inserted into the expansion tank.

[0009] Optionally, the heating module further includes a connecting seat, which is fixedly connected to the support seat. The connecting seat is attached to and fixedly connected to the outer wall of the expansion tank.

[0010] Optionally, the heating rod has a U-shaped structure or a spiral structure.

[0011] Optionally, the cooling unit further includes an oil cooler, the inlet of which is connected to the first outlet of the water cooler, and the outlet of the oil cooler is connected to the inlet of the booster pump.

[0012] Optionally, the cooling water system further includes an outboard water cooling unit, which includes an outboard water pump and an air cooler. The outboard water pump is used to introduce outboard water, and the air cooler is used to cool the generator inside the diesel engine. The outlet of the outboard water pump, the air cooler, and the second inlet of the water cooler are connected in sequence, and the second outlet of the water cooler is used to discharge outboard water.

[0013] Optionally, the outboard water cooling unit further includes a first shut-off valve, a second shut-off valve, and a needle valve. The first shut-off valve is disposed between the outlet of the outboard water pump and the inlet of the air cooler. The second shut-off valve is disposed between the outlet of the air cooler and the second inlet of the water cooler. The needle valve is disposed between the outlet of the outboard water pump and the second inlet of the water cooler.

[0014] In a second aspect, the present invention provides a method of using a cooling water system for a diesel engine, the method being based on the cooling water system for a diesel engine described in the first aspect, the method comprising: Before the diesel engine is started, the fresh water is heated by the heating module, and the booster pump is started so that the heated fresh water is pumped into the diesel engine and flows back to the expansion tank. When the diesel engine starts, the heating module stops. One stream of high-temperature fresh water flowing from the water outlet of the diesel engine cylinder is regulated by the water temperature regulator and enters the water cooler. After being cooled by the water cooler, it is pressurized and flows back to the water inlet of the diesel engine cylinder. The other stream of high-temperature fresh water flowing from the water outlet of the diesel engine cylinder is pressurized and flows back to the water inlet of the diesel engine cylinder after passing through the expansion tank.

[0015] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0016] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: In the cooling water system for a diesel engine provided in this embodiment of the invention, before starting the diesel engine in extremely cold regions, fresh water is first heated by a heating module. The heating module is reliably fixed to the expansion tank via a fixed end, and its heating end extends into the expansion tank to directly heat the fresh water. This high heating efficiency allows the fresh water to quickly heat up and heat the cylinders in the diesel engine, improving the subsequent starting efficiency. Next, a booster pump is started, pumping the heated fresh water into the diesel engine and back to the expansion tank. The heated fresh water, after being pressurized, enters the water inlet of the diesel engine cylinders, fully preheats the cylinders, and is then returned to the expansion tank. During this process, the fresh water in the expansion tank is continuously heated and rapidly circulates into the cylinder water passages and is then recovered, thus quickly preheating the cylinders and preventing cold starts of the diesel engine, further improving starting efficiency.

[0017] When the diesel engine starts, the heating module stops, and the cylinders inside the diesel engine heat up rapidly during startup. On one hand, one stream of hot fresh water flowing from the water outlet of the diesel engine cylinder passes through the expansion tank and is pressurized before flowing back to the water inlet of the diesel engine cylinder. This means that a portion of the hot fresh water flowing from the water outlet of the diesel engine cylinder also re-enters the expansion tank for circulation. During this circulation, the expansion tank promptly discharges water vapor and dissipates heat, thus cooling the fresh water (i.e., the preheating unit acts as a cooling unit at this time). On the other hand, another stream of hot fresh water flowing from the water outlet of the diesel engine cylinder, after its flow rate into the water cooler is regulated by the water temperature regulator, is cooled by the water cooler, and then pressurized before flowing back to the water inlet of the diesel engine cylinder. At this point, the water temperature regulator can effectively regulate the flow rate into the water cooler, ensuring both sufficient cooling of the fresh water and efficient cooling. Therefore, by cooling in the two ways mentioned above, the high-temperature fresh water flowing out of the water outlet of the cylinder in the diesel engine can be circulated and fully cooled, thereby achieving sufficient cooling of the cylinder and ensuring the working performance of the diesel engine.

[0018] In other words, the cooling water system for diesel engines provided in this embodiment of the invention can not only quickly preheat the cylinders in the diesel engine before starting, thereby improving the starting efficiency of the diesel engine, but also achieve sufficient cooling of fresh water during the operation of the diesel engine, ensuring the working performance of the diesel engine. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a cooling water system for a diesel engine provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the arrangement of the control components provided in an embodiment of the present invention; Figure 3 This is a flowchart illustrating a method of using a cooling water system for a diesel engine, as provided in an embodiment of the present invention. In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Expansion tank; 21. Heating module; 211. Support base; 212. Heating rod; 213. Connecting base; 22. Booster pump; 31. Water temperature regulator; 32. Water cooler; 33. Oil cooler; 41. Sensor module; 42. AC power supply; 43. Data processing controller; 51. Outboard water pump; 52. Air cooler; 53. First shut-off valve; 54. Second shut-off valve; 55. Needle valve; 56. Third shut-off valve; 100. Diesel engine. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Example: Figure 1 This is a schematic diagram of a cooling water system for a diesel engine provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the cooling water system includes an expansion tank 1, a preheating unit, and a fresh water cooling unit.

[0026] The expansion tank 1 is filled with fresh water and is located outside the diesel engine 100.

[0027] The preheating unit includes a heating module 21 and a booster pump 22. The fixed end of the heating module 21 is located on the body of the expansion tank 1, and the heating end of the heating module 21 is located at the bottom of the expansion tank 1 to heat fresh water. The outlet of the expansion tank 1 is connected to the inlet of the booster pump 22. The outlet of the booster pump 22 is used to introduce fresh water into the water inlet a of the cylinder of the diesel engine 100. The inlet of the expansion tank 1 is used to connect to the water outlet b of the cylinder of the diesel engine 100. Figure 1 (Cylinder not shown).

[0028] The freshwater cooling unit includes a water temperature regulator 31 and a water cooler 32. The inlet of the water temperature regulator 31 is connected to the water outlet of the cylinder of the diesel engine 100. The first outlet of the water temperature regulator 31, the water cooler 32 and the inlet of the booster pump 22 are connected in sequence. The second outlet of the water temperature regulator 31 is connected to the inlet of the booster pump 22.

[0029] In the cooling water system for a diesel engine provided in this embodiment of the invention, before starting the diesel engine 100 in extremely cold regions, fresh water is first heated by the heating module 21. The heating module 21 is reliably fixed to the body of the expansion tank 1 via a fixed end, and its heating end extends into the expansion tank 1 to directly heat the fresh water. This high heating efficiency allows the fresh water to quickly heat up and heat the cylinders in the diesel engine 100, improving the subsequent starting efficiency of the diesel engine 100. Next, the booster pump 22 is started, pumping the heated fresh water into the diesel engine 100 and returning it to the expansion tank 1. The heated fresh water can be pressurized and enter the water inlet of the cylinder of the diesel engine 100. After fully preheating the cylinder, it is recycled to the expansion tank 1. During this process, the fresh water in the expansion tank 1 will be continuously heated in the expansion tank and quickly circulate into the cylinder water passage and be recycled, thereby quickly preheating the cylinder, avoiding the cold start of the diesel engine 100 and further improving the starting efficiency.

[0030] When the diesel engine 100 starts, the heating module 21 stops. During the startup process, the cylinders of the diesel engine 100 heat up rapidly. On one hand, one stream of hot fresh water flowing from the water outlet of the diesel engine 100's cylinders is pressurized and returned to the water inlet of the diesel engine 100's cylinders after passing through the expansion tank 1. This means that a portion of the hot fresh water flowing from the water outlet of the diesel engine 100's cylinders also re-enters the expansion tank 1 and circulates. During this circulation, the expansion tank 1 promptly discharges water vapor and dissipates heat, thus cooling the fresh water (i.e., the preheating unit can act as a cooling unit at this time). On the other hand, another stream of hot fresh water flowing from the water outlet of the diesel engine 100's cylinders is regulated by the water temperature regulator 31 and flows into the water cooler 32. After being cooled by the water cooler 32, it is pressurized and returned to the water inlet of the diesel engine 100's cylinders. At this time, the water temperature regulator 31 can reasonably regulate the flow rate into the water cooler 32, ensuring both sufficient cooling of the fresh water and efficient cooling. Therefore, by cooling in the two ways mentioned above, the high-temperature fresh water flowing out of the water outlet of the cylinder of the diesel engine 100 can be circulated and fully cooled, thereby achieving sufficient cooling of the cylinder and ensuring the working performance of the diesel engine 100.

[0031] In other words, the cooling water system for a diesel engine provided in this embodiment of the invention can not only quickly preheat the cylinders of the diesel engine 100 before starting the diesel engine 100, thereby improving the starting efficiency of the diesel engine 100, but also achieve sufficient cooling of fresh water during the operation of the diesel engine 100, ensuring the working performance of the diesel engine 100.

[0032] For example, the expansion tank 1 has a square structure.

[0033] It should be noted that the diesel engine 100 has multiple internal cylinders, and fresh water is introduced by connecting the water inlet a of the multiple cylinders through the booster pump 22.

[0034] Figure 2 This is a schematic diagram of the arrangement of the control components provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the cooling water system also includes a control component, which includes a sensor module 41, an AC power supply 42, and a data processing controller 43. The sensor module 41 is used to measure the performance parameters of the fresh water in the expansion tank 1 in real time. The AC power supply 42 is electrically connected to the heating end of the heating module 21. The data processing controller 43 is electrically connected to both the sensor module 41 and the AC power supply 42 to control the performance parameters of the fresh water within a set range by adjusting the current of the AC power supply 42.

[0035] In the above embodiment, the sensor module 41 can measure the performance parameters of the fresh water in the expansion tank 1 in real time, while the data processing controller 43 processes and analyzes the data collected by the sensor module 41 and regulates the current of the AC power supply 42 to ensure that the performance parameters of the fresh water are within the normal range, thereby realizing the automated and intelligent control of fresh water preheating.

[0036] Specifically, the performance parameters are one or both of temperature and pressure, with the temperature setting range being 25-35℃ and the pressure setting range being 2-3kg.

[0037] For example, the sensor module 41 can be one or both of a temperature sensor and a pressure sensor, ensuring that the temperature and pressure of the fresh water are within a suitable range during the preheating process. Specifically, regarding temperature, when the temperature sensor detects the fresh water temperature and transmits it to the data processing controller 43, the data processing controller 43 processes and analyzes the data. If the fresh water temperature is higher than the set range, the data processing controller 43 controls the AC power supply 42 to reduce the output current or stop supplying power until the temperature detected by the sensor module 41 reaches the set range. Similarly, when the temperature sensor detects the fresh water temperature and transmits it to the data processing controller 43, if the data processing controller 43 processes and analyzes the data, if the fresh water temperature is lower than the set range, the data processing controller 43 controls the AC power supply 42 to increase the output current until the temperature detected by the sensor module 41 reaches the set range. Furthermore, the sensor module 41 can also perform real-time measurement of the fresh water during diesel engine operation.

[0038] It should be noted that the performance parameters of the freshwater are set within a range manually. Correspondingly, the freshwater temperature during the preheating stage is set to 25-35℃, meaning that preheating can be completed quickly within this range. During the diesel engine's 100-speed operation, the freshwater temperature needs to be controlled between 70-105℃. Additionally, performance parameters can also include flow rate, etc., and this invention does not impose any limitations on this.

[0039] For example, the control component also includes an early warning device, which is electrically connected to the data processing controller 43. When the data processing controller 43 analyzes and determines that the freshwater temperature is not within the set range, the data processing controller 43 controls the early warning device to issue an early warning signal.

[0040] Furthermore, the sensor module 41 is inserted into the fixed end of the heating module 21, thereby realizing the integrated installation of the sensor module 41 and the heating module 21. That is, the sensor module 41 is installed simultaneously by installing the heating module 21, avoiding the need to open a separate hole on the expansion tank 1 to install the sensor module 41.

[0041] See also Figure 2The heating module 21 includes a support base 211 and a heating rod 212. The support base 211 is inserted into the body of the expansion tank 1, and one end of the heating rod 212 is inserted into the support base 211, while the other end of the heating rod 212 is inserted into the expansion tank 1. The support base 211 serves to support the heating rod 212, preventing it from being directly mounted on the expansion tank 1, while the heating rod 212 is used to heat fresh water.

[0042] For example, the heating rod 212 has a U-shaped structure or a spiral structure.

[0043] It is easy to understand that a U-shaped or spiral structure for the heating rod 212 increases the contact area between the heating rod 212 and the fresh water, improving the uniformity of heating and thus further increasing the heating efficiency. Additionally, the U-shaped or spiral structure reduces the resistance encountered during the fresh water circulation process, improving the circulation efficiency of the fresh water.

[0044] Furthermore, the heating module 21 also includes a connecting seat 213, which is fixedly connected to the support seat 211. The connecting seat 213 is attached to and fixedly connected to the outer wall of the expansion tank 1. The connecting seat 213 serves to connect the support seat 211 and the expansion tank 1.

[0045] For example, the connecting seat 213 is connected to the expansion tank 1 by bolts. The connecting seat 213 can be a nanoporous plate or a vacuum insulation plate, thereby playing a role in heat insulation.

[0046] For example, the heating rod 212 may have a diameter of 70 mm and a length of 312 mm, and the support base 211 may have a diameter of 100 mm.

[0047] See also Figure 1 The cooling unit also includes an oil cooler 33, the inlet of which is connected to the first outlet of the water cooler 32, and the outlet of the oil cooler 33 is connected to the inlet of the booster pump 22.

[0048] In the above embodiment, one path of the oil cooler 33 carries lubricating oil, and the other path carries fresh water. The fresh water can exchange heat with the lubricating oil, thereby cooling the lubricating oil. In other words, this cooling water system can not only cool the fresh water during the operation of the diesel engine 100, but also cool the lubricating oil.

[0049] In this embodiment, the cooling water system also includes an outboard water cooling unit, which includes an outboard water pump 51 and an air cooler 52. The outboard water pump 51 is used to introduce outboard water, and the air cooler 52 is used to cool the generator inside the diesel engine 100. The outlet of the outboard water pump 51, the air cooler 52 and the second inlet e of the water cooler 32 are connected in sequence, and the second outlet f of the water cooler 32 is used to discharge outboard water.

[0050] In the above embodiment, the outboard water cooling unit can not only cool the generator inside the diesel engine 100, but also exchange heat with fresh water on the water cooler 32, that is, it can simultaneously cool the fresh water, and finally achieve cooling and temperature reduction through the outboard water, which greatly reduces energy consumption.

[0051] For example, the first inlet c of the water cooler 32 is connected to the first outlet of the water temperature regulator 31, and the first outlet d of the water cooler 32 is connected to the inlet of the booster pump 22. Additionally, the outboard water can be seawater, river water, or lake water.

[0052] For example, the outboard water cooling unit also includes a third shut-off valve 56, which connects the outlet of the expansion tank 1 to the inlet of the outboard water pump 51. This allows the outboard water cooling unit to open the third shut-off valve 56 and discharge the water in a timely manner when the expansion tank 1 needs to be replaced with fresh water, when fresh water leaks, or when the fresh water temperature is too high (e.g., when the fresh water temperature is heated too high during the preheating process).

[0053] Furthermore, the outboard water cooling unit also includes a first shut-off valve 53, a second shut-off valve 54, and a needle valve 55. The first shut-off valve 53 is located between the outlet of the outboard water pump 51 and the inlet of the air cooler 52. The second shut-off valve 54 is located between the outlet of the air cooler 52 and the second inlet of the water cooler 32. The needle valve 55 is located between the outlet of the outboard water pump 51 and the second inlet of the water cooler 32. The first shut-off valve 53 and the second shut-off valve 54 control the flow of outboard water into and out of the air cooler 52, while the needle valve 55 directly connects the outboard water pump 51 to the water cooler 32, ensuring that the diesel engine 100's internal generator can still exchange heat with fresh water in the water cooler 32 when it is not operating.

[0054] Figure 3 This is a flowchart illustrating a method of using a cooling water system for a diesel engine, as provided in an embodiment of the present invention. Figure 3 As shown, this method of use is based on the above-mentioned cooling water system for a diesel engine, and the method of use includes: S1. Before starting the diesel engine 100, the fresh water is heated by the heating module 21, and the booster pump 22 is started so that the heated fresh water is pumped into the diesel engine 100 and flows back to the expansion tank 1.

[0055] S2. When the diesel engine 100 starts, the heating module 21 stops. One stream of fresh water from the high-temperature fresh water outlet of the cylinder of the diesel engine 100 is regulated by the water temperature regulator 31 and flows into the water cooler 32. After being cooled by the water cooler 32, it is pressurized and flows back to the water inlet of the cylinder of the diesel engine 100. The other stream of fresh water from the high-temperature fresh water outlet of the cylinder of the diesel engine 100 is pressurized and flows back to the water inlet of the cylinder of the diesel engine 100 after passing through the expansion tank 1.

[0056] The present invention provides a method for using a cooling water system for a diesel engine, which can not only quickly preheat the cylinders of the diesel engine 100 before starting the diesel engine 100, thereby improving the starting efficiency of the diesel engine 100, but also achieve sufficient cooling of the diesel engine 100 with fresh water during the operation of the diesel engine 100, ensuring the working performance of the diesel engine 100.

[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 cooling water system for a diesel engine, characterized in that, The cooling water system includes an expansion tank, a preheating unit, and a fresh water cooling unit; The expansion tank is filled with fresh water and is located outside the diesel engine. The preheating unit includes a heating module and a booster pump. The fixed end of the heating module is located on the body of the expansion tank, and the heating end of the heating module is located at the bottom of the expansion tank to heat fresh water. The outlet of the expansion tank is connected to the inlet of the booster pump. The outlet of the booster pump is used to introduce fresh water into the water inlet of the cylinder of the diesel engine. The inlet of the expansion tank is used to connect to the water outlet of the cylinder of the diesel engine. The freshwater cooling unit includes a water temperature regulator and a water cooler. The inlet of the water temperature regulator is used to connect to the water outlet of the cylinder in the diesel engine. The first outlet of the water temperature regulator, the water cooler, and the inlet of the booster pump are connected in sequence. The second outlet of the water temperature regulator is connected to the inlet of the booster pump.

2. A cooling water system for a diesel engine according to claim 1, characterized in that, The cooling water system also includes a control component, which includes a sensor module, an AC power supply, and a data processing controller. The sensor module is used to measure the performance parameters of the fresh water in the expansion tank in real time. The AC power supply is electrically connected to the heating end of the heating module. The data processing controller is electrically connected to both the sensor module and the AC power supply to control the performance parameters of the fresh water within a set range by adjusting the current of the AC power supply.

3. A cooling water system for a diesel engine according to claim 2, characterized in that, The sensor module is inserted into the fixed end of the heating module.

4. A cooling water system for a diesel engine according to claim 1, characterized in that, The heating module includes a support base and a heating rod. The support base is inserted into the body of the expansion tank, one end of the heating rod is inserted into the support base, and the other end of the heating rod is inserted into the expansion tank.

5. A cooling water system for a diesel engine according to claim 4, characterized in that, The heating module also includes a connecting seat, which is fixedly connected to the support seat. The connecting seat is attached to the outer wall of the expansion tank and is fixedly connected to the outer wall of the expansion tank.

6. A cooling water system for a diesel engine according to claim 4, characterized in that, The heating rod has a U-shaped or spiral structure.

7. A cooling water system for a diesel engine according to claim 1, characterized in that, The freshwater cooling unit also includes an oil cooler, the inlet of which is connected to the first outlet of the water cooler, and the outlet of which is connected to the inlet of the booster pump.

8. A cooling water system for a diesel engine according to claim 1, characterized in that, The cooling water system also includes an outboard water cooling unit, which includes an outboard water pump and an air cooler. The outboard water pump is used to introduce outboard water, and the air cooler is used to cool the generator inside the diesel engine. The outlet of the outboard water pump, the air cooler, and the second inlet of the water cooler are connected in sequence, and the second outlet of the water cooler is used to discharge outboard water.

9. A cooling water system for a diesel engine according to claim 8, characterized in that, The outboard water cooling unit further includes a first shut-off valve, a second shut-off valve, and a needle valve. The first shut-off valve is located between the outlet of the outboard water pump and the inlet of the air cooler. The second shut-off valve is located between the outlet of the air cooler and the second inlet of the water cooler. The needle valve is located between the outlet of the outboard water pump and the second inlet of the water cooler.

10. A method of using a cooling water system for a diesel engine, characterized in that, The method of use is based on a cooling water system for a diesel engine according to any one of claims 1-9, and the method of use includes: Before the diesel engine is started, the fresh water is heated by the heating module, and the booster pump is started so that the heated fresh water is pumped into the diesel engine and flows back to the expansion tank. When the diesel engine starts, the heating module stops. One stream of high-temperature fresh water flowing from the water outlet of the diesel engine cylinder is regulated by the water temperature regulator and enters the water cooler. After being cooled by the water cooler, it is pressurized and flows back to the water inlet of the diesel engine cylinder. The other stream of high-temperature fresh water flowing from the water outlet of the diesel engine cylinder is pressurized and flows back to the water inlet of the diesel engine cylinder after passing through the expansion tank.

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