A wind turbine ventilation system

Abstract

The utility model relates to a wind driven generator ventilation and heat dissipation system relates to wind driven generator technical field, including cabin, be equipped with gear case and generator in cabin inside, the end of cabin rotatoryly is equipped with wheel hub, a plurality of blades are fixedly installed to wheel hub outer wall, gear case input end is connected with wheel hub through main shaft, generator input end is connected with gear case output end through connecting shaft, the outer wall of generator is sleeved with the jacket, and the inside and top of cabin are equipped with pumping component and heat dissipation component respectively, and pumping component, heat dissipation component and jacket are connected into circulation loop, heat dissipation component includes support U type board and rotary plate, and the top of rotary plate is equipped with ventilation slot, and the inside of rotary plate is equipped with liquid inlet groove, liquid outlet groove and a plurality of connecting grooves, is equipped with a plurality of radiators in ventilation slot, is equipped with a plurality of radiating fins to the outer wall of radiator, and adjacent radiator is communicated through connecting groove and forms S type waterway, the utility model has solved the problem that the existing wind driven generator heat dissipation speed dynamic regulation is poor.

Description

Technical Field

[0001] This invention relates to the field of wind turbine technology, specifically to a wind turbine ventilation and heat dissipation system. Background Technology

[0002] A wind turbine is a device that converts the kinetic energy of wind into electrical energy. Its core purpose is to produce clean, renewable electricity for society. It captures wind energy by rotating huge blades driven by the wind. The blades drive an internal generator to convert mechanical energy into electrical energy, which is then transmitted through cables to the power grid and finally delivered to electricity-consuming terminals such as homes, factories, and businesses, providing energy for our production and daily life.

[0003] When the wind turbine blades rotate, they capture the kinetic energy of the air and efficiently transfer it to the generator through the gearbox, thereby converting it into electrical energy. During the power generation process, a large amount of heat is generated inside the generator due to electromagnetic and resistance losses. In order to prevent the equipment from overheating and damage and to maintain its efficient and stable operation, a water-cooled jacket structure is designed on the outside of the generator casing. This jacket is connected to the external radiator through pipelines to form a closed loop. A circulation pump drives the coolant to flow continuously between the jacket and the radiator. When the coolant flows through the water-cooled jacket, it absorbs the heat generated by the generator and then delivers it to the radiator for forced cooling, releasing the heat to the external environment and ensuring that the generator operates safely within the optimal temperature range.

[0004] Existing wind turbines have gradually revealed shortcomings during use, mainly in the following aspects:

[0005] The dynamic adjustment of heat dissipation speed is poor. Specifically, due to the significant instability of outdoor wind speed, when the wind speed is high, the wind turbine blades rotate faster, the power generation increases, and the internal losses of the generator intensify, causing a sharp rise in heat generation. At this time, the demand for heat dissipation capacity also increases. Conversely, under low wind speed conditions, the blade rotation speed decreases, the power generation decreases, the heat generation decreases accordingly, and the demand for heat dissipation weakens. However, the existing wind turbine cooling system usually uses a fixed structure radiator and a circulation pump with a constant speed. The heat dissipation area of ​​the radiator and the flow rate of the coolant cannot be adjusted, causing the cooling system to operate at a fixed heat dissipation rate. Therefore, under continuous high wind speed conditions, insufficient heat dissipation capacity is prone to occur, leading to generator overheating and even insulation aging or thermal damage. On the other hand, when the wind speed is low for a long period of time, "overcooling" may occur due to excessive heat dissipation, causing the generator operating temperature to be too low and affecting its operating efficiency.

[0006] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a ventilation and heat dissipation system for wind turbines. This system dynamically adjusts the heat dissipation rate based on changes in external wind speed. When wind speed increases, the effective heat dissipation area of ​​the radiator increases, and the coolant circulation speed accelerates, thus increasing the heat dissipation rate. Conversely, when wind speed decreases, the heat dissipation rate decreases accordingly. This dynamic adjustment mechanism, which responds in real-time to wind conditions, effectively avoids overheating of the generator windings and insulation damage caused by insufficient heat dissipation under high wind speed conditions. It also prevents excessively low generator operating temperatures due to overcooling during low wind speed periods, thereby ensuring that power generation efficiency remains within the optimal range and significantly extending the equipment's service life.

[0008] To address the above problems, the present invention provides the following technical solution:

[0009] A wind turbine ventilation and heat dissipation system includes a nacelle, a gearbox and a generator are installed inside the nacelle, a hub is rotatably installed at the end of the nacelle, a plurality of blades are fixedly installed on the outer wall of the hub, the input end of the gearbox is connected to the hub through a main shaft, the input end of the generator is connected to the output end of the gearbox through a connecting shaft, a jacket is fitted on the outer wall of the generator, a pumping component and a heat dissipation component are respectively installed inside and on the top of the nacelle, and the pumping component, the heat dissipation component and the jacket are connected to form a circulation loop;

[0010] The heat dissipation assembly includes a supporting U-shaped plate and a rotating plate. The top of the rotating plate is provided with a ventilation slot. The interior of the rotating plate is provided with an inlet slot, an outlet slot and several connecting slots. Several heat dissipation pipes are provided in the ventilation slots. Several heat dissipation fins are provided on the outer wall of the heat dissipation pipes. Adjacent heat dissipation pipes are connected through the connecting slots to form an S-shaped water channel. The inlet slot and the outlet slot are connected to the two ends of the S-shaped water channel. External fixing pipes are fixedly provided at opposite ends of the rotating plate. The external fixing pipes are rotatably connected to the supporting U-shaped plate. The outlet slot and the inlet slot are connected to the pumping assembly and the jacket.

[0011] The cabin is equipped with a transmission assembly. The connecting shaft drives one of the external fixed pipes through the transmission assembly. The connecting shaft also drives the pumping assembly. The faster the connecting shaft rotates, the larger the angle between the rotating plate and the horizontal plane, the faster the coolant circulates, and the faster the heat dissipation.

[0012] As an optimized solution, the transmission assembly includes a supporting L-shaped plate, a connecting shaft passing through and rotatably connected to the supporting L-shaped plate, a rotating shaft passing through the top of the supporting L-shaped plate, a lifting plate above the rotating shaft, a sliding rod fixedly connected to the bottom of the lifting plate, the bottom end of the sliding rod extending into the rotating shaft and slidably connected to it, connecting rods hinged to opposite ends of the lifting plate, a counterweight ball fixedly connected to one end of the connecting rod, several connecting plates hinged to the outer wall of the connecting rod, one end of the connecting plate hinged to the rotating shaft, a driving bevel gear fixedly fitted on the outer wall of the connecting shaft, a driven bevel gear meshing with the driving bevel gear fixedly fitted on the lower outer wall of the rotating shaft, a gear fixedly fitted on the outer wall of one of the outer fixed tubes, a rack slidably fitted on the inner wall of the supporting U-shaped plate meshing with the gear, the bottom end of the rack passing downward through the engine compartment and rotatably connected to the lifting plate.

[0013] As an optimized solution, a support cylinder is fixedly provided on the top of the L-shaped support plate, the outer wall of the support cylinder is an arc-shaped structure, the rotating shaft is located inside the support cylinder, and a limiting plate is fixedly connected to the top of the U-shaped support plate.

[0014] As an optimized solution, a support strip is fixedly provided on the inner wall of the supporting U-shaped plate, and the rack is slidably connected to the support strip.

[0015] As an optimized solution, the pumping assembly includes a pump casing, an impeller rotatably mounted inside the pump casing, a liquid inlet of the pump casing connected to a liquid outlet tank via an inlet pipe, a liquid outlet of the pump casing connected to a jacket via a connecting pipe, a driven shaft fixedly connected to the end of the impeller, one end of the driven shaft extending through the pump casing to the outside, and transmission wheels fixedly mounted on the outer walls of both the connecting shaft and the driven shaft, with the two transmission wheels connected by a transmission belt.

[0016] As an optimized solution, each of the external fixed tubes is provided with an internal fixed tube that is fixedly connected to the rotating plate. The two internal fixed tubes are connected to the liquid outlet tank and the liquid inlet tank respectively. The opposite ends of the supporting U-shaped plate are provided with through holes. The internal fixed tubes are connected to the through holes and are rotatably and sealingly connected to the supporting U-shaped plate. The liquid inlet tube is connected to one of the through holes, and the other through hole is connected to the jacket through the liquid outlet tube.

[0017] As an optimized solution, a fixed plate is fixedly installed at the bottom of the cabin, and the driven shaft is rotatably connected to the fixed plate.

[0018] As an optimized solution, an axial flow fan is fixedly installed on the top of the nacelle.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. External winds drive the blades to rotate, which, driven by the main shaft, gearbox, and connecting shaft, generates electricity. The generator produces heat, and the connecting shaft drives the driven shaft and impeller to rotate, thus circulating the coolant. The coolant is pressurized and discharged from the pump casing, enters the jacket through the connecting pipe to absorb the heat generated by the generator, and then enters the radiator pipe through the outlet pipe for cooling. The cooled coolant then enters the pump casing through the inlet pipe and is pressurized again by the impeller before being discharged. This cycle of coolant circulation cools the generator. The rotating connecting shaft also drives the rotating shaft, lifting plate, and counterweight ball to rotate. When external winds blow, the coolant... When the ambient wind speed increases, the blade rotation speed increases, the generator output increases, and the generated heat increases. The rotation speed of the connecting shaft increases with the blade rotation speed, and the rotation speed of the counterweight ball also increases. The centripetal force required for the counterweight ball increases, causing it to rise in height and thus moving the lifting plate and sliding rod downwards. This, in turn, causes the rack to slide downwards. Driven by the gears, the outer fixed tube drives the rotating plate to rotate, increasing the angle between the rotating plate and the horizontal plane. The axial flow fan continuously provides transverse airflow, increasing the total projected area of ​​the heat dissipation pipes and fins in the airflow direction. The interaction between the heat dissipation pipes and fins and the airflow... The increased contact area of ​​the blades, combined with the increased speed of the driven shaft and the connecting shaft, leads to a faster coolant circulation as the impeller speed increases. This, along with the increased total projected area of ​​the cooling pipes and fins in the airflow direction and the faster coolant circulation, enhances the generator's cooling efficiency. Conversely, when the external wind speed decreases, the reduced total projected area of ​​the cooling pipes and fins and the slower coolant circulation reduce the generator's cooling efficiency. This wind turbine's cooling speed can be dynamically adjusted according to changes in external wind speed. When the wind speed increases, the effective heat dissipation area of ​​the cooling pipes and fins increases, and the coolant circulation speed increases, resulting in improved cooling. Conversely, when the wind speed decreases, the cooling speed decreases. This dynamic adjustment mechanism, responding to wind conditions in real time, effectively avoids overheating of the generator windings and insulation damage caused by insufficient cooling under high wind speed conditions, and also prevents excessively low generator operating temperatures due to overcooling during low wind speed periods. This ensures that the power generation efficiency remains within the optimal range, significantly extending the equipment's service life.

[0021] 2. When the blade rotation speed increases to a certain value, the rotating plate rotates to a vertical position and is limited by the limiting plate. At this time, the effective heat dissipation area of ​​the heat dissipation pipe and heat dissipation fins is the largest, and the heat dissipation speed of the generator is the fastest. When the blade speed increases further, the rotating plate stops rotating, ensuring that the heat dissipation pipe and heat dissipation fins dissipate heat from the generator at the optimal heat dissipation speed. However, the speed of the impeller will increase with the increase of the connecting shaft speed. By further accelerating the circulation speed of the coolant, the heat dissipation speed of the generator is improved. After the rotating plate is limited by the limiting plate, the height of the counterweight ball no longer changes. When the external wind speed is extremely low, the blade stops rotating, and the counterweight ball contacts the support cylinder under the action of gravity. The support cylinder provides support for the counterweight ball. At this time, the rotating plate is in a horizontal state.

[0022] 3. The heat dissipation pipes and connecting grooves together form an S-shaped water channel, which increases the cooling path of the coolant and ensures the cooling effect of the coolant. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the cabin of the present invention;

[0026] Figure 3 This is a schematic diagram of the heat dissipation component of the present invention;

[0027] Figure 4 This is a schematic diagram of the internal structure of the rotating plate of the present invention;

[0028] Figure 5 This is a schematic diagram of the transmission component of the present invention;

[0029] Figure 6 This is a schematic diagram of the internal structure of the rotating shaft of the present invention;

[0030] Figure 7 This is a schematic diagram of the pumping assembly of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the circulating loop connecting pipe of the present invention.

[0032] In the diagram: 1-Hub; 2-Gearbox; 3-Blade; 4-Heat dissipation assembly; 5-Nacelle; 6-Jacket; 7-Generator; 8-Pumping assembly; 9-Main shaft; 10-Connecting shaft; 11-Transmission assembly; 12-Support L-shaped plate; 13-Pump casing; 14-Driven shaft; 15-Fixing plate; 16-Connecting pipe; 17-Outlet pipe; 18-Inlet pipe; 19-Drive bevel gear; 20-Driven bevel gear; 21-Rotating shaft; 22-Counterweight ball; 23-Connecting plate; 24- 25-Connecting rod; 26-Lifting plate; 27-Rack; 28-Sliding rod; 29-Support cylinder; 30-Impeller; 31-Transmission wheel; 32-Transmission belt; 33-Gear; 34-Support bar; 35-Rotating plate; 36-Support U-shaped plate; 37-Axial flow fan; 38-Limiting plate; 39-Ventilation slot; 40-External fixed pipe; 41-Internal fixed pipe; 42-Connecting hole; 43-Liquid inlet tank; 44-Heat dissipation fins; 45-Heat dissipation pipe; 46-Liquid outlet tank. Detailed Implementation

[0033] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0034] like Figures 1 to 8 As shown, a wind turbine ventilation and heat dissipation system includes a nacelle 5, a gearbox 2 and a generator 7 inside the nacelle 5, a hub 1 rotatably mounted at the end of the nacelle 5, and several blades 3 fixedly mounted on the outer wall of the hub 1. The input end of the gearbox 2 is connected to the hub 1 through a main shaft 9, and the input end of the generator 7 is connected to the output end of the gearbox 2 through a connecting shaft 10. A jacket 6 is fitted on the outer wall of the generator 7. A pumping assembly 8 and a heat dissipation assembly 4 are respectively provided inside and on the top of the nacelle 5. The pumping assembly 8, the heat dissipation assembly 4 and the jacket 6 are connected to form a circulation loop.

[0035] The heat dissipation assembly 4 includes a supporting U-shaped plate 35 and a rotating plate 34. The top of the rotating plate 34 is provided with a ventilation groove 38. The interior of the rotating plate 34 is provided with an inlet groove 42, an outlet groove 46 and several connecting grooves 45. Several heat dissipation pipes 44 are provided in the ventilation groove 38. Several heat dissipation fins 43 are provided on the outer wall of the heat dissipation pipes 44. Adjacent heat dissipation pipes 44 are connected through the connecting grooves 45 to form an S-shaped water channel. The inlet groove 42 and the outlet groove 46 are connected to the two ends of the S-shaped water channel respectively. External fixing pipes 39 are fixedly provided at opposite ends of the rotating plate 34. The external fixing pipes 39 are rotatably connected to the supporting U-shaped plate 35. The outlet groove 46 and the inlet groove 42 are connected to the pumping assembly 8 and the jacket 6 respectively.

[0036] The engine compartment 5 is equipped with a transmission assembly 11. The connecting shaft 10 drives one of the external fixed pipes 39 through the transmission assembly 11. The connecting shaft 10 also drives the pumping assembly 8. The faster the connecting shaft 10 rotates, the larger the angle between the rotating plate 34 and the horizontal plane, the faster the coolant circulation flow speed, and the faster the heat dissipation speed.

[0037] The transmission assembly 11 includes a supporting L-shaped plate 12, a connecting shaft 10 passing through the supporting L-shaped plate 12 and rotatably connected to it, a rotating shaft 21 rotatably connected to the top of the supporting L-shaped plate 12, a lifting plate 25 above the rotating shaft 21, a sliding rod 27 fixedly connected to the bottom of the lifting plate 25, the bottom end of the sliding rod 27 extending into the rotating shaft 21 and slidably connected to it, connecting rods 24 are hinged to opposite ends of the lifting plate 25, a counterweight ball 22 is fixedly connected to one end of the connecting rod 24, several connecting plates 23 are hinged to the outer wall of the connecting rod 24, one end of the connecting plate 23 is hinged to the rotating shaft 21, a driving bevel gear 19 is fixedly mounted on the outer wall of the connecting shaft 10, a driven bevel gear 20 meshing with the driving bevel gear 19 is fixedly mounted on the lower outer wall of the rotating shaft 21, a gear 32 is fixedly mounted on the outer wall of one of the outer fixed tubes 39, a rack 26 meshing with the gear 32 is slidably provided on the inner wall of the supporting U-shaped plate 35, the bottom end of the rack 26 passes downward through the cabin 5 and is rotatably connected to the lifting plate 25.

[0038] A support cylinder 28 is fixedly provided on the top of the L-shaped support plate 12. The outer wall of the support cylinder 28 has an arc structure. The rotating shaft 21 is located inside the support cylinder 28. A limit plate 37 is fixedly connected to the top of the U-shaped support plate 35.

[0039] A support bar 33 is fixedly provided on the inner wall of the support U-shaped plate 35, and the rack 26 is slidably connected to the support bar 33.

[0040] The pumping assembly 8 includes a pump housing 13, an impeller 29 is rotatably mounted inside the pump housing 13, the inlet of the pump housing 13 is connected to the outlet tank 46 through the inlet pipe 18, and the outlet of the pump housing 13 is connected to the jacket 6 through the connecting pipe 16. A driven shaft 14 is fixedly connected to the end of the impeller 29, one end of the driven shaft 14 extends through the pump housing 13 to the outside, and a drive wheel 30 is fixedly mounted on the outer wall of both the connecting shaft 10 and the driven shaft 14. The two drive wheels 30 are connected by a drive belt 31.

[0041] Each of the external fixed tubes 39 is provided with an internal fixed tube 40 that is fixedly connected to the rotating plate 34. The two internal fixed tubes 40 are connected to the liquid outlet 46 and the liquid inlet 42 respectively. The opposite ends of the supporting U-shaped plate 35 are provided with a through hole 41. The internal fixed tube 40 is connected to the through hole 41 and is rotatably and sealingly connected to the supporting U-shaped plate 35. The liquid inlet pipe 18 is connected to one of the through holes 41, and the other through hole 41 is connected to the jacket 6 through the liquid outlet pipe 17.

[0042] A fixed plate 15 is fixedly installed at the bottom of the cabin 5, and the driven shaft 14 is rotatably connected to the fixed plate 15.

[0043] An axial flow fan 36 is fixedly installed on the top of the nacelle 5.

[0044] The working principle of this device is as follows:

[0045] External winds cause blade 3 to rotate, which, driven by the main shaft 9, gearbox 2, and connecting shaft 10, generates electricity in generator 7. The generator 7 produces heat, which in turn drives the driven shaft 14 and impeller 29 to rotate, thus circulating the coolant. The coolant is pressurized and discharged from pump casing 13, enters jacket 6 through connecting pipe 16 to absorb the heat generated by generator 7, and then enters radiator pipe 44 through outlet pipe 17 for cooling. The cooled coolant then enters pump casing 13 through inlet pipe 18 and is pressurized again by impeller 29 and discharged. This cycle of coolant circulation cools generator 7. The rotating connecting shaft 10 also drives rotating shaft 21 and lifting plate 25. As the counterweight ball 22 rotates, the rotational speed of the blade 3 increases when the external wind speed increases, leading to increased power generation and heat generation in the generator 7. The rotational speed of the connecting shaft 10 increases with the increase in the blade 3's rotational speed, consequently increasing the rotational speed of the counterweight ball 22. This increases the centripetal force required for the counterweight ball 22, causing it to rise and move the lifting plate 25 and sliding rod 27 downwards. This, in turn, causes the rack 26 to slide downwards. Driven by the gear 32, the outer fixed pipe 39 drives the rotating plate 34 to rotate, increasing the angle between the rotating plate 34 and the horizontal plane. The axial flow fan 36 continuously provides transverse airflow. The heat dissipation pipe 44 and the heat dissipation fins 43 are aligned in the direction of the airflow. With the increase in total projected area, the contact area between the heat dissipation pipe 44 and the heat dissipation fins 43 and the airflow increases. As the speed of the blade 3 increases, the speed of the driven shaft 14 increases with the speed of the connecting shaft 10, and the speed of the impeller 29 increases, thereby accelerating the circulation speed of the coolant. The increase in the total projected area of ​​the heat dissipation pipe 44 and the heat dissipation fins 43 in the airflow direction, along with the increased circulation speed of the coolant, jointly improves the heat dissipation speed of the generator 7. Conversely, when the external wind speed decreases, the decrease in the total projected area of ​​the heat dissipation pipe 44 and the heat dissipation fins 43 in the airflow direction, along with the decrease in the circulation speed of the coolant, jointly reduces the heat dissipation speed of the generator 7. The cooling speed of the wind turbine 7 can be dynamically adjusted according to changes in external wind speed. When the wind speed increases, the effective heat dissipation area of ​​the heat dissipation pipe 44 and the heat dissipation fins 43 increases, and the coolant circulation speed increases, thus improving the cooling speed. Conversely, when the wind speed decreases, the cooling speed decreases accordingly. Through this dynamic adjustment mechanism that responds to wind conditions in real time, it effectively avoids the problem of overheating of the generator 7 windings and thermal damage to the insulation caused by insufficient heat dissipation under high wind speed conditions, and also prevents the generator 7 from operating at too low a temperature due to excessive cooling during low wind speed periods. This ensures that the power generation efficiency is always in the optimal range and greatly extends the service life of the equipment.

[0046] When the rotational speed of blade 3 increases to a certain value, the rotating plate 34 rotates to a vertical state and is limited by the limiting plate 37. At this time, the effective heat dissipation area of ​​the heat dissipation pipe 44 and the heat dissipation fins 43 is the largest, and the heat dissipation speed of the generator 7 is the fastest. When the rotational speed of blade 3 increases further, the rotating plate 34 stops rotating, ensuring that the heat dissipation pipe 44 and the heat dissipation fins 43 dissipate heat to the generator 7 at the best heat dissipation speed. However, the rotational speed of impeller 29 will increase with the increase of the rotational speed of connecting shaft 10. By further accelerating the circulation speed of coolant, the heat dissipation speed of generator 7 is increased. After the rotating plate 34 is limited by the limiting plate 37, the height of counterweight ball 22 no longer changes. When the external wind speed is extremely low, blade 3 stops rotating, and counterweight ball 22 contacts the support cylinder 28 under the action of gravity. The support cylinder 28 provides support for counterweight ball 22. At this time, the rotating plate 34 is in a horizontal state.

[0047] The heat pipe 44 and the connecting groove 45 together form an S-shaped water channel, which increases the cooling path of the coolant and ensures the cooling effect of the coolant.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A ventilation and heat dissipation system for a wind turbine generator, characterized in that: The engine room includes a nacelle (5), inside which are a gearbox (2) and a generator (7). A hub (1) is rotatably mounted at the end of the engine room (5). Several blades (3) are fixedly installed on the outer wall of the hub (1). The input end of the gearbox (2) is connected to the hub (1) via a main shaft (9). The input end of the generator (7) is connected to the output end of the gearbox (2) via a connecting shaft (10). A jacket (6) is fitted on the outer wall of the generator (7). A pumping assembly (8) and a heat dissipation assembly (4) are respectively provided inside and on the top of the engine room (5). The pumping assembly (8), the heat dissipation assembly (4), and the jacket (6) are connected to form a circulation loop. The heat dissipation assembly (4) includes a supporting U-shaped plate (35) and a rotating plate (34). The top of the rotating plate (34) is provided with a ventilation groove (38). The rotating plate (34) is provided with an inlet groove (42), an outlet groove (46) and several connecting grooves (45) inside. Several heat dissipation pipes (44) are provided in the ventilation groove (38). Several heat dissipation fins (43) are provided on the outer wall of the heat dissipation pipes (44). Adjacent heat dissipation pipes (44) are connected through the connecting grooves (45) to form an S-shaped water channel. The inlet groove (42) and the outlet groove (46) are connected to the two ends of the S-shaped water channel. The opposite ends of the rotating plate (34) are fixedly provided with an external fixing pipe (39). The external fixing pipe (39) is rotatably connected to the supporting U-shaped plate (35). The outlet groove (46) and the inlet groove (42) are connected to the pumping assembly (8) and the jacket (6). The cabin (5) is equipped with a transmission assembly (11). The connecting shaft (10) drives one of the external fixed pipes (39) through the transmission assembly (11). The connecting shaft (10) also drives the pumping assembly (8). The faster the connecting shaft (10) rotates, the larger the angle between the rotating plate (34) and the horizontal plane, the faster the coolant circulation flow and the faster the heat dissipation. The transmission assembly (11) includes a supporting L-shaped plate (12), a connecting shaft (10) passing through the supporting L-shaped plate (12) and rotatably connected to it, a rotating shaft (21) rotatably connected to the top of the supporting L-shaped plate (12), a lifting plate (25) above the rotating shaft (21), a sliding rod (27) fixedly connected to the bottom of the lifting plate (25), the bottom end of the sliding rod (27) extending into the rotating shaft (21) and slidably connected to it, connecting rods (24) hinged to opposite ends of the lifting plate (25), a counterweight ball (22) fixedly connected to one end of the connecting rod (24), and the connecting rod (24) is connected to the counterweight ball (22). A number of connecting plates (23) are hinged to the outer wall of the rod (24). One end of the connecting plate (23) is hinged to the rotating shaft (21). A drive bevel gear (19) is fixedly fitted on the outer wall of the connecting shaft (10). A driven bevel gear (20) that meshes with the drive bevel gear (19) is fixedly fitted on the lower outer wall of the rotating shaft (21). A gear (32) is fixedly fitted on the outer wall of one of the outer fixed tubes (39). A rack (26) that meshes with the gear (32) is slidably provided on the inner wall of the supporting U-shaped plate (35). The bottom end of the rack (26) passes downward through the cabin (5) and is rotatably connected to the lifting plate (25). An axial flow fan (36) is fixedly installed on the top of the nacelle (5).

2. The wind turbine ventilation and heat dissipation system according to claim 1, characterized in that: The top of the L-shaped support plate (12) is fixedly provided with a support cylinder (28), the outer wall of the support cylinder (28) is an arc structure, the rotating shaft (21) is located inside the support cylinder (28), and the top of the support U-shaped plate (35) is fixedly connected with a limiting plate (37).

3. The wind turbine ventilation and heat dissipation system according to claim 1, characterized in that: The inner wall of the supporting U-shaped plate (35) is fixedly provided with a support strip (33), and the rack (26) is slidably connected to the support strip (33).

4. The wind turbine ventilation and heat dissipation system according to claim 1, characterized in that: The pumping assembly (8) includes a pump housing (13), an impeller (29) is rotatably mounted inside the pump housing (13), the inlet of the pump housing (13) is connected to the outlet tank (46) through the inlet pipe (18), and the outlet of the pump housing (13) is connected to the jacket (6) through the connecting pipe (16). A driven shaft (14) is fixedly connected to the end of the impeller (29), and one end of the driven shaft (14) extends through the pump housing (13) to the outside. Both the connecting shaft (10) and the outer wall of the driven shaft (14) are fixedly fitted with transmission wheels (30), and the two transmission wheels (30) are connected by a transmission belt (31).

5. A wind turbine ventilation and heat dissipation system according to claim 4, characterized in that: The outer fixed tube (39) is provided with an inner fixed tube (40) that is fixedly connected to the rotating plate (34). The two inner fixed tubes (40) are connected to the liquid outlet tank (46) and the liquid inlet tank (42) respectively. The opposite ends of the supporting U-shaped plate (35) are provided with a through hole (41). The inner fixed tube (40) is connected to the through hole (41) and is rotatably and sealed to the supporting U-shaped plate (35). The liquid inlet tube (18) is connected to one of the through holes (41). The other through hole (41) is connected to the jacket (6) through the liquid outlet tube (17).

6. A wind turbine ventilation and heat dissipation system according to claim 4, characterized in that: A fixed plate (15) is fixedly installed at the bottom of the cabin (5), and the driven shaft (14) is rotatably connected to the fixed plate (15).

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