A wind turbine cooling system

Abstract

The utility model belongs to the field of wind power generation technology especially is a kind of wind driven generator cooling system, including the support base of wind power tower drum bottom installation, the top of wind power tower drum is connected with wind power cabin, and open cooling system is provided in wind power cabin, and one end of support base is fixedly connected with the transfer storehouse for containing cooling water, and transfer storehouse includes two independent storage bins, and water in the inside of lower storage bin is transported to the upper storage bin by transfer water pump;Water in open cooling system is directly or indirectly discharged through drain pipe, the bottom end of drain pipe is communicated with lower storage bin, and one section of drain pipe is immersed in seawater to radiate heat, and the water inlet end of open cooling system is directly or indirectly communicated with the upper storage bin through backwater pipe, and the mode that traditional open cooling system is directly introduced into seawater to exchange heat is changed into introducing pure water and recycling, to avoid seawater directly corroding open cooling system.

Description

Technical Field

[0001] This utility model belongs to the field of wind power generation technology, and specifically relates to a wind turbine cooling system. Background Technology

[0002] Offshore wind energy resources are abundant and do not occupy land area, resulting in higher resource utilization. Due to the abundance of offshore wind energy resources, the blades of offshore wind turbines rotate at a faster speed and for a longer period of time due to wind force. Therefore, offshore wind turbines have higher requirements for heat dissipation inside the nacelle. Seawater is a natural heat exchange medium, so offshore wind turbines have certain advantages in adopting open cooling systems. Traditional open cooling systems directly introduce seawater to absorb heat and then discharge hot water, which is also directly discharged into the sea. This eliminates the need for traditional heat dissipation devices, significantly reducing weight and simplifying the structure. However, since the inside of such devices is in direct contact with seawater, these devices need to be resistant to high pressure, corrosion, and high salt, and require regular maintenance. Utility Model Content

[0003] To address the problems mentioned in the background section, this invention provides a wind turbine cooling system that changes the traditional open cooling system's method of directly introducing seawater for heat exchange to introducing purified water and circulating it, thus avoiding direct corrosion of the open cooling system by seawater.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a wind turbine cooling system, including a support foundation installed at the bottom of the wind turbine tower, a wind turbine nacelle connected to the top of the wind turbine tower, an open cooling system installed inside the wind turbine nacelle, and a transfer chamber for holding cooling water fixedly connected to one end of the support foundation. The transfer chamber includes two independent storage chambers, upper and lower, and a transfer water pump transports water from the lower storage chamber to the upper storage chamber.

[0005] In an open cooling system, water is discharged directly or indirectly through a drain pipe. The bottom end of the drain pipe is connected to the storage chamber below, and one section of the drain pipe is submerged in seawater for heat dissipation. The upper storage chamber is directly or indirectly connected to the water inlet of the open cooling system through a return water pipe, and the bottom inlet of the return water pipe is higher than the bottom outlet of the drain pipe.

[0006] As a preferred embodiment of the wind turbine cooling system of this utility model, water level sensors are fixedly connected to the inner sides of the two independent storage compartments respectively.

[0007] As a preferred embodiment of the wind turbine cooling system of this utility model, a ventilation hole is provided at the top of the lower storage compartment, and a dustproof and breathable cover is detachably connected to the top opening of the upper storage compartment.

[0008] As a preferred embodiment of the wind turbine cooling system of this utility model, the inlet end of the transfer water pump is connected to the lower storage compartment through the water pump inlet pipe, the outlet end of the transfer water pump is connected to the inlet end of the filter assembly through the water pump outlet pipe, and the outlet end of the filter assembly is connected to the upper storage compartment through the filter outlet pipe.

[0009] As a preferred embodiment of the wind turbine cooling system of this utility model, an annular temporary storage shell is fixedly connected to the outer side of the wind turbine tower. Two independent annular storage spaces are provided on the inner side of the temporary storage shell. Annular plates are rotatably connected to the top inner side of the two independent annular storage spaces. Both annular plates are fixedly connected to the surface of the wind turbine nacelle through connecting plates. The annular plates are rotatably sealed to the top of the temporary storage shell through sealing strips. The top end of the return water pipe is connected to annular storage space A. An upper water inlet pipe with its bottom end extending to the inner side of annular storage space A is fixedly connected to the annular plate located at annular storage space A. The top end of the upper water inlet pipe passes through the wind turbine nacelle and is fixedly connected to the water inlet end of the open cooling system. The top end of the drain pipe is connected to annular storage space B. An upper water outlet pipe with its bottom end extending to the inner side of annular storage space B is fixedly connected to the annular plate located at annular storage space B. The top end of the upper water outlet pipe passes through the wind turbine nacelle and is fixedly connected to the drain end of the open cooling system.

[0010] As a preferred embodiment of the wind turbine cooling system of this utility model, the section of the drain pipe submerged in seawater is a serpentine section.

[0011] As a preferred embodiment of the wind turbine cooling system of this utility model, an electromagnetic control valve is installed at the drain end of the drain pipe.

[0012] As a preferred embodiment of the wind turbine cooling system of this utility model, one end of the drain pipe is fixedly connected to the top connection port of the three-way distribution valve A, the middle connection port of the three-way distribution valve A is fixedly connected to the waste heat inlet of the seawater desalination device through water pipe A, the seawater inlet of the seawater desalination device is connected to a seawater inlet pipe, one end of the seawater inlet pipe is equipped with a seawater pump, the desalinated water drain end of the seawater desalination device is connected to the middle connection port of the three-way distribution valve B through water pipe B, the bottom connection port of the three-way distribution valve B is fixedly connected to the other end of the drain pipe, and the waste heat drain end of the seawater desalination device is connected to the drain pipe through a waste heat pipe and a three-way connector.

[0013] As a preferred embodiment of the wind turbine cooling system of this utility model, an intermediate water pipe is fixedly connected between the bottom connection port of the three-way distribution valve A and the top connection port of the three-way distribution valve B.

[0014] As a preferred embodiment of the wind turbine cooling system of this utility model, a filter head is fixedly connected to the bottom of the seawater inlet pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are: it changes the traditional open cooling system from directly introducing seawater for heat exchange to introducing pure water, and the pure water is used in a cyclical manner as a heat exchange method. The pure water undergoes heat exchange through the portion of the pure water that sinks into the seawater through the drain pipe, thereby achieving the purpose of cooling with pure water. Since the liquid in the open cooling system is not seawater but pure water, the direct corrosion of the open cooling system by seawater is avoided, and the blockage caused by the high salt environment in the open cooling system can also be avoided. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 In this utility model Figure 1 An enlarged structural diagram at point A;

[0019] Figure 3 This is a partial structural diagram of the present invention;

[0020] Figure 4 This is a partial structural cross-sectional view of the present invention;

[0021] Figure 5 In this utility model Figure 4 A magnified structural diagram at point B;

[0022] Figure 6 This is a partial structural cross-sectional view of the temporary storage shell in this utility model;

[0023] Figure 7 This is a schematic diagram of the connection structure of the transit warehouse in this utility model;

[0024] Figure 8 This is a cross-sectional view of the internal structure of the transit warehouse in this utility model;

[0025] Figure 9 This is a schematic diagram of the connection structure of the three-way distribution valve A in this utility model;

[0026] Figure 10 This is a first-view schematic diagram of the connection structure of the filter assembly in this utility model;

[0027] Figure 11 This is a second-view schematic diagram of the connection structure of the filter assembly in this utility model;

[0028] In the picture:

[0029] 1. Supporting foundation; 2. Wind turbine tower; 3. Wind turbine nacelle; 4. Transfer compartment; 41. Ventilation hole; 42. Dustproof and breathable cover; 43. Water level sensor; 5. Transfer water pump; 6. Return water pipe; 7. Water pump outlet pipe; 71. Water pump inlet pipe; 8. Filter assembly; 9. Filter outlet pipe; 10. Temporary storage housing; 11. Annular plate; 12. Sealing strip; 13. Upper inlet pipe; 14. Upper outlet pipe; 15. Drain pipe; 16. Serpentine section; 17. Electromagnetic control valve; 18. Three-way distribution valve A; 19. Water pipe A; 20. Seawater desalination unit; 21. Water pipe B; 22. Three-way distribution valve B; 24. Seawater inlet pipe; 25. Seawater pump; 26. Waste heat pipe; 27. Intermediate water pipe; 28. Filter head; 29. ​​Connecting plate. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1-11 As shown:

[0032] A wind turbine cooling system is applicable to wind turbines with fixed pitch angles but not to wind turbines with active pitch angle adjustment capability. It includes a support base 1 installed at the bottom of the wind turbine tower 2, a wind turbine nacelle 3 connected to the top of the wind turbine tower 2, an open cooling system installed inside the wind turbine nacelle 3, and a transfer chamber 4 for holding cooling water fixedly connected to one end of the support base 1. The transfer chamber 4 can store more pure water and includes two independent storage chambers, upper and lower. A transfer water pump 5 transports water from the lower storage chamber to the upper storage chamber.

[0033] Water in the open cooling system is discharged directly or indirectly through the drain pipe 15. The bottom end of the drain pipe 15 is connected to the storage compartment on the lower side, and one section of the drain pipe 15 is submerged in seawater for heat dissipation. The upper storage compartment is directly or indirectly connected to the water inlet of the open cooling system through the return water pipe 6, and the bottom water inlet of the return water pipe 6 is higher than the bottom drain of the drain pipe 15.

[0034] In this embodiment, offshore wind energy resources are abundant and do not occupy land area, resulting in higher resource utilization. Due to the abundance of offshore wind energy resources, the blades of offshore wind turbines rotate faster and for a longer period of time due to wind influence. Therefore, offshore wind turbines have higher requirements for heat dissipation in the nacelle. Furthermore, seawater is a natural heat exchange medium, so offshore wind turbines have certain advantages in adopting an open cooling system. Traditional open cooling systems directly introduce seawater to absorb heat and then discharge hot water, which is also directly discharged into the sea. This eliminates the need for traditional heat dissipation devices, significantly reducing weight and simplifying the structure. However, since the interior of such devices is in direct contact with seawater, these devices need to be resistant to high pressure, corrosion, and high salt, and require regular maintenance.

[0035] This solution changes the traditional open cooling system from directly introducing seawater for heat exchange to introducing pure water. The pure water is used in a cyclical manner for heat exchange. The pure water is submerged in the seawater through the drain pipe 15 to exchange heat with the pure water, thus achieving the purpose of cooling with pure water. Since the liquid in the open cooling system is pure water instead of seawater, the direct corrosion of the open cooling system by seawater is avoided, and the blockage caused by the high salt environment in the open cooling system can also be avoided.

[0036] Specifically, after heat exchange, the high-temperature pure water discharged from the open cooling system will be discharged through drain pipe 15, such as... Figure 3 , Figure 4 and Figure 7 As shown, the drain pipe 15 can pass through the inside of the wind turbine tower 2 and lead into the sea. This appearance looks simpler. The part of the drain pipe 15 that is submerged in the sea can exchange heat due to the temperature difference of the seawater. This allows the purified water to exchange heat with the seawater through the drain pipe 15, thereby cooling the purified water. The cooled purified water will enter the lower storage chamber. The intermediate water pump 5 will transport the purified water in the lower storage chamber to the upper storage chamber, thereby achieving separate storage of purified water and raising the water level. The bottom inlet of the return water pipe 6 is higher than the bottom outlet of the drain pipe 15. It utilizes the water pressure difference caused by the height difference (essentially the siphon principle) to achieve continuous circulation of purified water. Since the flow of purified water has a certain resistance, and different models of wind power systems and open cooling systems have certain requirements for the circulation speed and flow rate of purified water, the distance difference between the bottom inlet of the return water pipe 6 and the bottom outlet of the drain pipe 15, as well as the diameter of the pipe, can be adjusted according to actual needs to meet actual requirements.

[0037] In an optional embodiment, water level sensors 43 are fixedly connected to the inside of the two independent storage compartments.

[0038] In this embodiment, the water level sensor 43 can detect the water levels in the upper and lower storage chambers. The transfer pump 5 can actively adjust the water levels in the upper and lower storage chambers. For example, if the water level in the lower storage chamber is too high, the transfer pump 5 can transfer water from the lower storage chamber to the upper storage chamber. Conversely, if the water level in the lower storage chamber is too low and the water level in the upper storage chamber is too high, the power of the transfer pump 5 can be reduced or the operation of the transfer pump 5 can be stopped. Since pure water evaporates, there may be a situation where the water levels in both the upper and lower storage chambers decrease. When the water levels in both chambers are below the preset limit, countermeasures will need to be taken.

[0039] In an optional embodiment, a ventilation hole 41 is provided at the top of the lower storage compartment, and a dustproof and breathable cover 42 is detachably connected to the top opening of the upper storage compartment.

[0040] In this embodiment, the ventilation hole 41 is designed to prevent changes in air pressure in the lower storage compartment, while the purified water in the upper storage compartment should be cleaner, so a dustproof and breathable cover 42 is installed.

[0041] In an optional embodiment, the inlet of the transfer pump 5 is connected to the lower storage compartment via the pump inlet pipe 71, the outlet of the transfer pump 5 is connected to the inlet of the filter assembly 8 via the pump outlet pipe 7, and the outlet of the filter assembly 8 is connected to the upper storage compartment via the filter outlet pipe 9.

[0042] In this embodiment, when the transfer water pump 5 starts working, the water in the lower storage compartment is introduced into the transfer water pump 5 through the water pump inlet pipe 71. After being pressurized by the transfer water pump 5, the pure water is transported to the filter assembly 8 through the water pump outlet pipe 7, thereby filtering the pure water. Under the water pressure provided by the transfer water pump 5, the filter assembly 8 transports the filtered pure water to the upper storage compartment through the filter outlet pipe 9.

[0043] In an optional embodiment, an annular temporary storage shell 10 is fixedly connected to the outer side of the wind turbine tower 2. Two independent annular storage spaces are provided on the inner side of the temporary storage shell 10. Annular plates 11 are rotatably connected to the inner top of the two independent annular storage spaces. Both annular plates 11 are fixedly connected to the surface of the wind turbine nacelle 3 through connecting plates 29. The annular plates 11 are rotatably sealed to the top of the temporary storage shell 10 through sealing strips 12. The top end of the return water pipe 6 is connected to the annular storage space A. An upper water inlet pipe 13 with its bottom end extending to the inner side of the annular storage space A is fixedly connected to the annular plate 11 located at the annular storage space A. The top end of the upper water inlet pipe 13 passes through the wind turbine nacelle 3 and is fixedly connected to the water inlet end of the open cooling system. The top end of the drain pipe 15 is connected to the annular storage space B. An upper water outlet pipe 14 with its bottom end extending to the inner side of the annular storage space B is fixedly connected to the annular plate 11 located at the annular storage space B. The top end of the upper water outlet pipe 14 passes through the wind turbine nacelle 3 and is fixedly connected to the drain end of the open cooling system.

[0044] In this embodiment, the open cooling system is installed in the wind turbine nacelle 3. The wind turbine nacelle 3 rotates relative to the wind turbine tower 2 and the supporting foundation 1. Therefore, direct connection of the water pipes will cause the water pipes to twist. This problem is solved by setting up a temporary storage shell 10. The water in the return water pipe 6 enters the annular storage space A and then enters the upper water inlet pipe 13. The upper water inlet pipe 13 delivers pure water to the open cooling system for heat exchange. When the open cooling system discharges high-temperature pure water after complete heat exchange, it is discharged into the annular storage space B through the upper water outlet pipe 14. The high-temperature pure water in the annular storage space B enters the drain pipe 15. When the wind turbine nacelle 3 rotates relative to the wind turbine tower 2, the wind turbine nacelle 3 will drive the connecting plate 29, thereby driving the annular plate 11 to rotate, so that the annular plate 11 rotates relative to the temporary storage shell 10. Thus, during the stable water delivery process, the return water pipe 6 can rotate relative to the upper water inlet pipe 13 and the upper water outlet pipe 14 can rotate relative to the drain pipe 15.

[0045] In an alternative embodiment, the section of the drain pipe 15 submerged in seawater is a serpentine section 16.

[0046] In this embodiment, the serpentine structure of the 16 is beneficial for reducing the size of the heat exchange section.

[0047] In an optional embodiment, an electromagnetic control valve 17 is installed at the drain end of the drain pipe 15.

[0048] In this embodiment, the electromagnetic control valve 17 can control the passage, disconnection, flow rate, and flow volume of the drain pipe 15. When pure water circulation is not required, the electromagnetic control valve 17 can be used to close the passage of the drain pipe 15, thereby realizing the on / off control of water circulation or flow rate and flow volume of the entire water circulation route.

[0049] In an optional embodiment, one end of the drain pipe 15 is fixedly connected to the top connection port of the three-way distribution valve A18, the middle connection port of the three-way distribution valve A18 is fixedly connected to the waste heat inlet of the seawater desalination device 20 through the water pipe A19, the seawater inlet of the seawater desalination device 20 is connected to the seawater inlet pipe 24, one end of the seawater inlet pipe 24 is equipped with a seawater pump 25, the seawater pump 25 is fixedly connected to the seawater desalination device 20, the desalinated water drain end of the seawater desalination device 20 is connected to the middle connection port of the three-way distribution valve B22 through the water pipe B21, the bottom connection port of the three-way distribution valve B22 is fixedly connected to the other end of the drain pipe 15, and the waste heat drain end of the seawater desalination device 20 is connected to the drain pipe 15 through the waste heat pipe 26 via a three-way connector. The transfer chamber 4, the filter assembly 8 and the seawater desalination device 20 can all be fixed on the support foundation 1.

[0050] In this embodiment, since purified water evaporates, when the two water level sensors 43 detect that the water level has dropped to the minimum preset value, water needs to be replenished. This replenishment can be done through the seawater desalination device 20. Seawater is pumped into the desalination device 20 from the seawater inlet pipe 24 by the seawater pump 25. At this time, the top and middle connections of the three-way distribution valve A18 are open, while the bottom connection of the three-way distribution valve A18 is closed. The middle and bottom connections of the three-way distribution valve B22 are open, allowing high-temperature purified water to enter the three-way distribution valve A18 from the drain pipe 15 and then enter the water pipe A19, thus entering the seawater desalination device 20. The high-temperature purified water is used for seawater desalination. Heat energy is provided by the desalination unit 20. After obtaining heat energy, the seawater entering the desalination unit 20 from the seawater inlet pipe 24 can be desalinated into pure water. The desalinated pure water will flow into the three-way distribution valve B22 through the water pipe B21 and then into the drain pipe 15. The high-temperature pure water entering the desalination unit 20 through the water pipe A19 will enter the drain pipe 15 again through the waste heat pipe 26. The high-temperature pure water and seawater do not travel through the same water path in the desalination unit 20 and do not mix. The high-temperature pure water entering the desalination unit 20 only provides heat energy for the desalination unit 20. When the heat energy provided by the high-temperature pure water is insufficient, the desalination unit 20 will use electricity for additional auxiliary heating.

[0051] The seawater desalination unit 20 can be an Alfa Laval AQUA Blue Mini E1 model, which produces 1-15 cubic meters of water per day, fully meeting the water evaporation requirements of an open cooling system (based on the 8m³ / day circulating water volume of an open cooling system in a domestic 5MW wind power system). 3 / h, with a daily evaporation rate of approximately 20-40L / day during the high-temperature summer period, and occupying an area of ​​only 0.3 square meters, it is a highly efficient seawater desalination device that is primarily driven by waste heat and requires only a small amount of electricity for auxiliary purposes; the Alfa Laval AQUA Blue Mini E1 achieves ultra-low energy consumption for seawater desalination through a design concept that prioritizes heat drive and uses electricity for auxiliary purposes; its average daily power consumption is only 0.8-1.2 kWh, which is 1 / 6-1 / 8 of that of traditional RO systems, and maintenance costs are reduced by more than 70%; AQUA Blue Mini E1 employs vacuum distillation technology, which reduces the internal pressure of the equipment to 75-99% vacuum. Under this environment, the boiling point of seawater is significantly reduced. At normal pressure, the boiling point of seawater is about 100℃; at 75% vacuum, the boiling point drops to about 65℃; and at 99% vacuum, the boiling point can be as low as 40℃. In contrast, the outlet water temperature range of traditional generators (stator) is ≤55-60℃ (doubly fed generator ≤55℃, direct drive generator ≤60℃) and converter (IGBT) ≤65℃.

[0052] In an optional embodiment, an intermediate water pipe 27 is fixedly connected between the bottom connection port of the three-way distribution valve A18 and the top connection port of the three-way distribution valve B22.

[0053] In this embodiment, when water replenishment is not required through the seawater desalination device 20, the seawater pump 25 stops working, the middle connection ports of the three-way distribution valve A18 and the three-way distribution valve B22 are disconnected, and the remaining symmetrical two-way connection ports are opened. The water in the drain pipe 15 will enter the middle water pipe 27 and then re-enter the drain pipe 15.

[0054] In an optional embodiment, a filter head 28 is fixedly connected to the bottom of the seawater inlet pipe 24.

[0055] In this embodiment, the filter head 28 is used to filter impurities in seawater.

[0056] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wind turbine cooling system, comprising a support foundation (1) installed at the bottom of a wind turbine tower (2), a wind turbine nacelle (3) connected to the top of the wind turbine tower (2), and an open cooling system provided inside the wind turbine nacelle (3), characterized in that: One end of the supporting foundation (1) is fixedly connected to a transfer chamber (4) for holding cooling water. The transfer chamber (4) includes two independent storage chambers, upper and lower. The water inside the lower storage chamber is transported to the upper storage chamber by a transfer water pump (5). Water in the open cooling system is discharged directly or indirectly through the drain pipe (15). The bottom end of the drain pipe (15) is connected to the storage chamber on the lower side, and one section of the drain pipe (15) is submerged in seawater for heat dissipation. The upper storage chamber is directly or indirectly connected to the water inlet of the open cooling system through the return water pipe (6), and the bottom water inlet of the return water pipe (6) is higher than the bottom drain end of the drain pipe (15).

2. The wind turbine cooling system according to claim 1, characterized in that: Water level sensors (43) are fixedly connected to the inside of the two independent storage compartments.

3. The wind turbine cooling system according to claim 1, characterized in that: A ventilation hole (41) is provided at the top of the lower storage compartment, and a dustproof and breathable cover (42) is detachably connected to the top opening of the upper storage compartment.

4. The wind turbine cooling system according to claim 1, characterized in that: The inlet of the transfer pump (5) is connected to the storage chamber on the lower side through the pump inlet pipe (71), the outlet of the transfer pump (5) is connected to the inlet of the filter assembly (8) through the pump outlet pipe (7), and the outlet of the filter assembly (8) is connected to the storage chamber on the upper side through the filter outlet pipe (9).

5. The wind turbine cooling system according to claim 1, characterized in that: An annular temporary storage shell (10) is fixedly connected to the outside of the wind turbine tower (2). Two independent annular storage spaces are provided on the inside of the temporary storage shell (10). Annular plates (11) are rotatably connected to the top inner sides of the two independent annular storage spaces. Both annular plates (11) are fixedly connected to the surface of the wind turbine nacelle (3) through connecting plates (29). The annular plates (11) are rotatably sealed to the top of the temporary storage shell (10) through sealing strips (12). The top end of the return water pipe (6) is connected to the annular storage space A and is located in the annular storage space. The annular plate (11) at point A is fixedly connected to an upper water inlet pipe (13) extending from the bottom end to the inside of the annular storage space A. The top end of the upper water inlet pipe (13) passes through the wind turbine nacelle (3) and is fixedly connected to the water inlet end of the open cooling system. The top end of the drain pipe (15) is connected to the annular storage space B. The annular plate (11) at point B is fixedly connected to an upper water outlet pipe (14) extending from the bottom end to the inside of the annular storage space B. The top end of the upper water outlet pipe (14) passes through the wind turbine nacelle (3) and is fixedly connected to the drain end of the open cooling system.

6. The wind turbine cooling system according to claim 1, characterized in that: The section of the drain pipe (15) that is submerged in the seawater is the serpentine section (16).

7. The wind turbine cooling system according to claim 1, characterized in that: An electromagnetic control valve (17) is installed at the drain end of the drain pipe (15).

8. The wind turbine cooling system according to claim 1, characterized in that: One end of the drain pipe (15) is fixedly connected to the top connection port of the three-way distribution valve A (18). The middle connection port of the three-way distribution valve A (18) is fixedly connected to the waste heat inlet of the seawater desalination device (20) through the water pipe A (19). The seawater inlet of the seawater desalination device (20) is connected to the seawater inlet pipe (24). One end of the seawater inlet pipe (24) is equipped with a seawater pump (25). The desalinated water drain end of the seawater desalination device (20) is connected to the middle connection port of the three-way distribution valve B (22) through the water pipe B (21). The bottom connection port of the three-way distribution valve B (22) is fixedly connected to the other end of the drain pipe (15). The waste heat drain end of the seawater desalination device (20) is connected to the drain pipe (15) through the waste heat pipe (26) and the three-way connector.

9. The wind turbine cooling system according to claim 8, characterized in that: An intermediate water pipe (27) is fixedly connected between the bottom connection port of the three-way distribution valve A (18) and the top connection port of the three-way distribution valve B (22).

10. The wind turbine cooling system according to claim 8, characterized in that: A filter head (28) is fixedly connected to the bottom of the seawater inlet pipe (24).

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