Wind turbine nacelle and wind turbine comprising same

Abstract

A wind turbine nacelle, comprising a heat dissipation device (2), a gearbox (1), a cooling pipe (3) and a nacelle (4), wherein nacelle walls of the nacelle are provided with ventilation openings (41) leading to the outside; the heat dissipation device and the gearbox are separately arranged, are connected by means of the cooling pipe, and are respectively fixed by means of the nacelle walls of the nacelle; the heat dissipation device cools a cooling fluid in the cooling pipe, and the heat dissipation device is arranged close to the ventilation openings; the gearbox is arranged away from the ventilation openings. The heat dissipation device can directly exchange air with the outside of the nacelle by means of existing ventilation openings of the nacelle walls, without the need to newly form ventilation holes in a nacelle cover or other positions of the nacelle, thereby reducing the overall costs of the nacelle. At high temperatures, the temperature of inlet air and outlet air of the heat dissipation device can both be lower than the temperature inside the nacelle, and the temperature difference between the temperature inside the nacelle and the oil temperature of the gearbox is greater, thus improving the heat dissipation effect on the gearbox. The heat dissipation device and the gearbox are arranged separately, so as to improve the flexibility of arrangement of the heat dissipation device. In addition, the present application also relates to a wind turbine comprising the wind turbine nacelle.

Description

Wind turbine nacelle and wind turbine containing it

[0001] This application claims priority to Chinese patent application 2025201746183, filed on January 26, 2025. The entire contents of the aforementioned Chinese patent application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of wind power equipment, and in particular to a wind turbine nacelle and a wind turbine generator comprising therein. Background Technology

[0003] The gearbox of a wind turbine is installed inside the nacelle and requires heat dissipation to maintain normal operation. As shown in Figure 1, in the prior art, the gearbox heat dissipation device typically consists of two parts: gearbox 1' and heat dissipation device 2'.

[0004] The heat dissipation device 2' is installed on the top of the gearbox 1'. There is an oil passage 3' between the heat dissipation device 2' and the gearbox 1' to accommodate oil circulation. The oil carries away the heat in the gearbox 1', becomes high-temperature oil and then enters the heat dissipation device 2' to dissipate heat. After becoming low-temperature oil, it enters the gearbox 1' again to carry away the heat in the gearbox 1'.

[0005] There are two main cooling schemes for the heat dissipation device: a water-cooling scheme, which requires a water-cooling circuit to be set up around the heat dissipation device 2', resulting in higher costs; and an air-cooling scheme, which eliminates the need for additional equipment and uses the air inside the engine compartment for cooling. Generally, considering cost, the air-cooling scheme is adopted. The heat dissipation device 2' includes a cooling fan 21' (located at the top to accelerate airflow and enhance the heat dissipation effect of the plate heat exchanger 22') and a plate heat exchanger 22' (located at the bottom, where the oil passage 3' exchanges heat with the plate heat exchanger 22'). The cooling fan 21' draws in air from the engine compartment, exchanges heat with the plate heat exchanger 22', and then exhausts the air to the exhaust vents at the top of the engine compartment, achieving the cooling purpose. However, the air-cooling scheme currently has the following problems:

[0006] First, the high summer temperatures, with the cabin temperature reaching 45-50°C, result in a small temperature difference between the cabin temperature and the gearbox 1' oil temperature, leading to poor heat dissipation. This necessitates increasing the area of ​​the plate heat exchanger 22' and the power of the fan motor to meet the heat dissipation requirements, thus increasing the overall cost.

[0007] Second, the cooling fan 21' cools the plate heat exchanger 22' by absorbing a large amount of air from inside the cabin. Therefore, the cabin cover needs to have many ventilation holes for air intake, which increases the design difficulty of the cabin cover and the overall cost of the cabin.

[0008] Third, the cooling fan 21' is placed above the gearbox 1', occupying a large amount of overhead space. If the overall transportation plan is adopted, the gearbox heat dissipation device needs to be installed in the cabin. Since the cooling fan 21' is directly connected to the exhaust vent at the top of the cabin, a temporary cover structure needs to be installed above the exhaust vent to prevent rainwater from entering. This structure will be removed after transportation to the destination, making the overall height exceed the requirements for land transportation, resulting in excessive transportation difficulty and transportation costs.

[0009] Fourth, if a separate transportation plan is adopted, the heat dissipation device 2' will be sent to the site for installation separately. The heat dissipation device 2' and the gearbox 1' will require both a sealed oil circuit 3' connection and a fixed connection to fix the heat dissipation device 2'. The requirements for the oil circuit 3' are high, the on-site installation is complicated, the time is long, and the risk of oil leakage is relatively high. Summary of the Invention

[0010] The technical problem to be solved by this application is the poor performance of existing gearbox cooling devices and the high cost of nacelle design due to poor heat dissipation. The application provides a gearbox cooling device and a wind turbine unit containing the same.

[0011] This application solves the above-mentioned technical problems through the following technical solution:

[0012] A wind turbine nacelle includes a heat dissipation device, a gearbox, cooling pipes, and a nacelle, wherein the heat dissipation device and the gearbox are both located inside the nacelle.

[0013] The cabin walls are equipped with ventilation openings that connect to the outside.

[0014] The heat dissipation device and the gearbox are separately configured and connected by the cooling pipes. They are fixed by the cabin walls and the heat dissipation device is located near the vent.

[0015] In this technical solution, by providing this wind turbine nacelle, the heat dissipation effect of the cooling device on the gearbox can be improved, and the overall cost of the nacelle can be reduced. The cooling device can directly achieve air exchange through the existing ventilation openings in the nacelle wall and the outside of the nacelle, eliminating the need to create new ventilation holes in the nacelle cover or other locations, thus reducing the overall cost of the nacelle. Furthermore, in summer or other high-temperature conditions, the inlet and outlet temperatures of the cooling device are lower than the temperature inside the nacelle, and the temperature difference with the gearbox oil temperature is greater, improving the heat dissipation effect on the gearbox. In addition, the cooling device and gearbox are set separately, which increases the flexibility of the cooling device layout without changing the inherent position of the gearbox.

[0016] The vents and the heat dissipation device are both located at the rear of the engine compartment, while the gearbox is located in the middle or front of the engine compartment; and / or,

[0017] The vent is connected to the heat dissipation device via a sealed air passage; and / or,

[0018] The ventilation opening is located on the non-top wall of the cabin.

[0019] In this technical solution, by setting the ventilation openings and heat dissipation devices at the rear of the cabin and the gearbox at the middle or front of the cabin, it is convenient to arrange the cooling pipes in the ventilation openings and avoid the oil lines obstructing the pedestrian passage at the front of the cabin.

[0020] By setting up sealed air passages, the cabin temperature can be further prevented from adversely affecting the heat dissipation effect of the vents.

[0021] By placing the ventilation openings on the non-top wall of the nacelle, with the height of the openings lower than the total height of the nacelle, the height of the temporary structure located outside the nacelle wall corresponding to the ventilation openings is less likely to exceed the height limit during the transportation of the wind turbine nacelle. The wind turbine nacelle can be transported as a whole by land without disassembling the heat dissipation device, thus avoiding a series of problems caused by openings at the top, such as exceeding the height limit during land transportation, increasing transportation costs; and requiring on-site installation and disassembly of the heat dissipation device, leading to oil leaks and excessive on-site labor time.

[0022] Preferably, the ventilation opening includes an air inlet and an air outlet.

[0023] In this technical solution, the above settings facilitate the proper intake and exhaust of air for the heat dissipation device, reducing the impact of high-temperature air at the exhaust port on the intake port.

[0024] Preferably, the cabin wall is further provided with an air inlet channel and an air outlet channel that penetrate the cabin wall. The heat dissipation device is connected to the air inlet channel through the air inlet and to the air outlet channel through the air outlet, forming a flow path that flows sequentially through the air inlet channel, the air inlet, the heat dissipation device, the air outlet and the air outlet channel.

[0025] The air intake duct is arranged diagonally downward and / or downward from inside the cabin to outside the cabin;

[0026] The air outlet duct is arranged diagonally downwards and / or downwards from inside the cabin to the outside of the cabin.

[0027] In this technical solution, the aforementioned cabin layout allows outside air to flow through the airflow path, facilitating efficient air intake and exhaust for the heat dissipation device and reducing the impact of high-temperature air at the exhaust vent on the intake vent. The intake and exhaust ducts are positioned diagonally downwards and / or downwards, making it difficult for rainwater to enter them. This eliminates the need to cover the intake and exhaust duct outlets, thus avoiding the need for temporary structures and preventing exceeding height limits during transport.

[0028] Preferably, the heat dissipation device includes a cooling fan and a heat exchanger in the flow path, wherein the cooling fan is located upstream of the flow path and the heat exchanger is located downstream of the flow path;

[0029] The air inlet of the cooling fan is sealed to the air inlet channel through the air inlet port;

[0030] The air outlet of the heat exchanger is sealed to the ventilation port connected by the air outlet channel.

[0031] In this technical solution, the above settings can further prevent the high-temperature air at the outlet of the heat exchanger from affecting the inlet of the cooling fan.

[0032] Preferably, the air intake duct is located on the side wall at the rear of the nacelle, and the air intake opening of the cooling fan faces the outside of the nacelle in a horizontal direction;

[0033] The air outlet duct is located on the bottom plate at the rear of the nacelle, and the air outlet of the heat exchanger faces the outside of the nacelle in a vertical direction.

[0034] In this technical solution, the above settings facilitate the placement of the heat dissipation device at the corner of the cabin side wall, and the separation of air intake and exhaust is achieved by using ventilation openings in different directions, further preventing the high-temperature gas at the exhaust outlet from affecting the air intake.

[0035] Preferably, the cooling pipeline includes a first pipe, which is a rigid pipe, the length of which matches the distance between the gearbox and the heat dissipation device, and the first pipe is fixed to the bulkhead of the cabin.

[0036] In this technical solution, the above settings can reduce the probability of the cooling pipes being damaged by external forces, improve safety, and prevent the first pipe from colliding with other cabin structures or obstructing personnel passage.

[0037] Preferably, the end of the first pipe is detachably connected to the gearbox via a connector; and / or,

[0038] The cooling pipeline also includes a second pipe, which is a flexible pipe, and the second pipe connects the heat dissipation device and the end of the first pipe.

[0039] In this technical solution, the end of the first pipe is detachably connected to the gearbox via a connector, which facilitates the maintenance of the gearbox's front and rear oil circuits. The second pipe is made of a flexible material, which allows for easy adjustment of the cooling device's position.

[0040] Preferably, the cabin further includes a heat dissipation frame, which is disposed near the ventilation opening and connected to the cabin wall, and the heat dissipation device is mounted on the heat dissipation frame.

[0041] In this technical solution, the heat dissipation device can be fixed in a relatively simple structure through the above settings.

[0042] A wind turbine generator includes a wind turbine nacelle as described above.

[0043] In this technical solution, by providing this wind turbine, the heat dissipation effect of the gearbox can be improved and the overall cost of the nacelle can be reduced.

[0044] The positive and progressive effects of this application are as follows:

[0045] By providing this wind turbine nacelle and the wind turbine generator including it, the heat dissipation effect of the cooling system on the gearbox can be improved, and the overall cost of the nacelle can be reduced. The cooling system can directly exchange air through existing vents in the nacelle wall and the outside of the nacelle, eliminating the need to create new ventilation holes in the nacelle cover or other locations, thus reducing the overall cost of the nacelle. Furthermore, in summer or other high-temperature conditions, the inlet and outlet temperatures of the cooling system are lower than the temperature inside the nacelle, and the temperature difference with the gearbox oil temperature is greater, improving the heat dissipation effect on the gearbox. In addition, the cooling system and gearbox are set up separately, which increases the flexibility of the cooling system layout without changing the inherent position of the gearbox. Attached Figure Description

[0046] Figure 1 is a three-dimensional structural diagram of the heat dissipation device and gearbox of the prior art.

[0047] Figure 2 is a three-dimensional structural diagram of a heat dissipation device and a gearbox according to an embodiment of this application.

[0048] Figure 3 is a cross-sectional structural diagram of a wind turbine nacelle according to an embodiment of this application.

[0049] Figure 4 is a magnified view of part A in Figure 3.

[0050] Explanation of reference numerals in the attached figures:

[0051] In Figure 1, the gearbox is 1', the heat dissipation device is 2', the cooling fan is 21', the plate heat exchanger is 22', and the oil passage is 3'.

[0052] In Figures 2, 3, and 4, the components are: gearbox 1, heat dissipation device 2, cooling fan 21, air inlet 211, heat exchanger 22, air outlet 221, cooling pipes 3, first pipe 31, second pipe 32, connector 33; engine compartment 4, air inlet duct 401, air outlet 402, vent 41, air inlet 411, air outlet 412, filter 413, heat sink 42, air passage 43, clamp 431, and rotating cover 44. Detailed Implementation

[0053] As shown in Figures 2 and 3, this embodiment provides a wind turbine nacelle 4, which includes a heat dissipation device 2, a gearbox 1, cooling pipes 3, and a nacelle 4. The nacelle 4 has a ventilation opening 41 that connects to the outside. The heat dissipation device 2 and the gearbox 1 are separately arranged and connected by the cooling pipes 3, and are respectively fixed by the nacelle 4 wall. The heat dissipation device 2 is located near the ventilation opening 41, and the gearbox 1 is located away from the ventilation opening 41. The ventilation opening 41 can be located on the side wall of the nacelle 4.

[0054] This improves the heat dissipation effect of the heat dissipation device 2 on the gearbox 1 and reduces the overall cost of the engine compartment 4. The heat dissipation device 2 can directly exchange air through the existing ventilation openings 41 on the bulkhead and the outside of the engine compartment 4, without having to open new ventilation holes in the engine compartment cover (not shown in the figure) or other locations, thus reducing the overall cost of the engine compartment 4.

[0055] In this embodiment, cooling pipe 3 is an oil circuit. During the operation of gearbox 1, oil is drawn by a lubricating oil pump (not shown in the figure), passes through a filter element and heat exchanger 22, and returns to gearbox 1, realizing oil circulation to remove heat from gearbox 1 and achieve a heat dissipation effect. In other embodiments, the cooling pipe can also transport other cooling fluids, such as water, water-based solutions (ethylene glycol / propylene glycol aqueous solution, etc.), liquid metals (liquid sodium, liquid lead, etc.), gases (air, nitrogen, carbon dioxide, etc.), and phase change fluids (hydrofluorocarbons / hydrofluoroolefins, propane, isobutane, ammonia, etc.) to achieve a similar cooling effect.

[0056] In this embodiment, the head of the cabin 4 is defined as the part connected to the rotating shield 44, the tail of the cabin 4 is the part away from the rotating shield 44, and the middle part of the cabin 4 is the part connecting the head and tail of the cabin 4. Generally, the directly usable vents 41 are located on the tail side wall, left side wall, and right side wall of the cabin 4, or other locations not on the top wall or front side wall of the cabin 4. This is because the front side wall of the cabin 4 may house the rotating shield 44 and its internal hubs, drive structures, support bearings, etc., occupying a large space, and generally does not have separate vents. Since the vents 41 are located on locations not on the top wall of the cabin 4, the height h of the vents 41 is lower than the total height H of the cabin 4.

[0057] Please refer to Figure 3 again. In this embodiment, the ventilation openings 41 are located on the side and bottom walls of the nacelle 4, rather than on the top wall. This makes it easier for the height of the temporary structure (not shown in the figure) located outside the nacelle 4 wall corresponding to the ventilation openings 41 during transportation to avoid exceeding the height limit. The wind turbine nacelle 4 can be transported as a whole by land without disassembling the heat dissipation device, thus avoiding a series of problems caused by openings at the top, such as exceeding the height limit during land transportation, increasing transportation costs, and requiring on-site installation and disassembly of the heat dissipation device, resulting in oil leaks and excessive on-site labor time.

[0058] Furthermore, in summer or under high temperatures caused by other reasons, the temperature of the air intake and exhaust of the heat dissipation device 2 can be lower than the temperature inside the engine compartment 4, and the temperature difference with the oil temperature of the gearbox 1 is greater, thus improving the heat dissipation effect on the gearbox 1.

[0059] Typically, in summer, the ambient temperature inside the cabin can reach 45-50°C; however, this embodiment can be designed based on a maximum air temperature of 35°C.

[0060] In this embodiment, the heat dissipation device 2 includes a cooling fan 21 and a heat exchanger 22, wherein the heat exchanger 22 is a plate heat exchanger. Since the heat dissipation device 2 is located near the vent 41, the airflow requirement can be met, the motor power of the cooling fan 21 can be reduced by one level, and the plate heat exchanger area of ​​the heat exchanger 22 can be reduced to half that of the prior art. The specific reduction in size can be adjusted according to the wind turbine model and actual conditions. Of course, in other embodiments, even if the heat dissipation device uses other configurations (such as replacing the heat exchanger with a spiral plate heat exchanger, a tubular heat exchanger, etc.), the purpose of improving the heat dissipation effect can still be achieved.

[0061] Furthermore, the heat dissipation device 2 and the gearbox 1 are separate units, which improves the flexibility of the heat dissipation device 2's arrangement without changing the inherent position of the gearbox 1. In this embodiment, "separate units" means that the main components of the gearbox 1 and the heat dissipation device 2 are independent of each other.

[0062] In this embodiment, the cabin 4 also includes a heat sink 42, which is located near the ventilation opening 41 and connected to the cabin wall. The heat dissipation device 2 is mounted on the heat sink 42. In this way, the heat dissipation device 2 can be fixed in a relatively simple structure.

[0063] In this embodiment, the ventilation opening 41 includes an air inlet 411 and an air outlet 412 (two ventilation openings 41 are shown in the cross section of Figure 3, and a partial enlargement of Figure 4 shows an air inlet 411 and an air outlet 412. However, in actual application scenarios, the existing ventilation openings in the cabin are used to install the heat dissipation device, so the number of air inlets and air outlets can be more). This facilitates the heat dissipation device 2 to reasonably intake and exhaust air, and reduces the impact of the high-temperature air at the air outlet 412 on the air inlet 411.

[0064] Furthermore, in this embodiment, the cabin wall of the engine room 4 is also provided with an air inlet channel 401 and an air outlet channel 402 that penetrate the cabin wall (a partial enlargement of Figure 4 shows one air inlet channel 401 and one air outlet channel 402, but as mentioned above, the number of air inlet channels and air inlets, and the number of air outlet channels and air outlets are matched, so the number of air inlet channels and air outlet channels can be more). The heat dissipation device 2 is connected to the air inlet channel 401 through the air inlet 411 and to the air outlet channel 402 through the air outlet 412, forming a flow path that flows sequentially through the air inlet channel 401, the air inlet 411, the heat dissipation device 2, the air outlet 412, and the air outlet channel 402. This cabin layout allows outside air to flow through this flow path for heat dissipation, further facilitating the reasonable intake and exhaust of air by the heat dissipation device 2 and reducing the impact of high-temperature air at the air outlet 412 on the air inlet 411.

[0065] In this embodiment, the air intake duct 401 is arranged diagonally downwards from the inside to the outside of the cabin 4, and the air outlet duct 402 is arranged diagonally downwards from the inside to the outside of the cabin 4. This prevents rainwater from easily entering the air intake duct 401 and the air outlet duct 402, eliminating the need to cover their outlets and thus avoiding the need for temporary structures, preventing exceeding height limits during transportation. In other embodiments, the air intake duct may also be arranged diagonally downwards from the inside to the outside of the cabin, and the air outlet duct may also be arranged diagonally downwards from the inside to the outside of the cabin.

[0066] In this embodiment, both the vent 41 and the heat dissipation device 2 are located at the rear of the engine compartment 4, while the gearbox 1 is located in the middle of the engine compartment 4. This facilitates the arrangement of the cooling pipes 3 within the engine compartment 4 and avoids obstructing the pedestrian walkway (not shown in the figure) at the front of the engine compartment 4. In other embodiments, the gearbox may also be located at the front of the engine compartment.

[0067] In this embodiment, the vent 41 is connected to the heat dissipation device 2 via a sealed air passage 43. This further prevents the cabin temperature of the engine compartment 4 from adversely affecting the heat dissipation effect of the air inlet 411.

[0068] In this embodiment, the cooling fan 21 is located upstream of the flow path, and the heat exchanger 22 is located downstream of the flow path. The air inlet 211 of the cooling fan 21 is sealed and connected to the air inlet 411 connected by the air inlet channel 401 through an air channel 43. The air outlet 221 of the heat exchanger 22 is sealed and connected to the air outlet 412 connected by the air outlet channel 402 through another air channel 43, so as to further avoid the influence of the high temperature air at the air outlet 221 of the heat exchanger 22 on the air inlet 211 of the cooling fan 21.

[0069] Please refer to Figure 4 again. In this embodiment, the air inlet duct 401 is located on the side wall at the rear of the engine compartment 4, and the air inlet opening 211 of the cooling fan 21 faces the outside of the engine compartment 4 in a horizontal direction. The air outlet duct 402 is located on the bottom plate at the rear of the engine compartment 4, and the air outlet opening 221 of the heat exchanger 22 faces the outside of the engine compartment 4 in a vertical direction. This allows the heat dissipation device 2 to be placed at the corner of the side wall of the engine compartment 4, and the air inlet and outlet are separated by the ventilation openings 41 in different directions, further preventing the high-temperature gas at the air outlet opening 221 from affecting the air inlet opening 211. Of course, in other embodiments, the heat dissipation device can also be located in other positions that do not easily affect personnel passage, pipeline layout, etc.; the air inlet duct and the air outlet duct can also be located on the side wall of the engine compartment at the same time, or on the bottom plate of the engine compartment at the same time, preferably maximizing the distance between the air inlet duct and the air outlet duct without affecting other structures of the engine compartment, thereby achieving the separation of air inlet and outlet.

[0070] In this embodiment, filters 412 are provided on both the air inlet channel 401 and the air outlet channel 402. This can prevent certain floating objects (such as willow catkins) from entering the air inlet channel 401 and the air outlet channel 402, and then entering the heat dissipation device 2 to cause adverse effects.

[0071] In this embodiment, the two ends of the two air channels 43 are respectively connected to the air inlet 411, the air inlet 211 of the cooling fan 21, the air outlet 412, and the air outlet 221 of the heat exchanger 22 by clamps 431 to ensure their airtightness. Of course, in other embodiments, other sealing connection methods such as self-tightening seals can also be used at the two ends of the air channels.

[0072] In this embodiment, the cooling pipe 3 includes a first pipe 31, which is a rigid pipe. The length of the first pipe 31 matches the distance between the gearbox 1 and the heat dissipation device 2. This reduces the probability of the cooling pipe 3 being damaged by external forces and improves safety.

[0073] In this embodiment, the cooling pipe 3 further includes a second pipe 32, which is a flexible pipe. The second pipe 32 connects the end of the heat exchanger 22 and the first pipe 31. This facilitates adjustment of the position of the heat exchanger 22. Furthermore, considering the need to improve heat dissipation, the flexible pipe 32 in this embodiment is preferably a flexible hose with good thermal conductivity, such as a metal flexible hose.

[0074] In this embodiment, the first pipe 31 is a steel pipe. This makes the cost of the cooling pipe 3 reasonable. Of course, in other embodiments, the first pipe can also be made of other hard materials that do not react with the oil.

[0075] In this embodiment, the first pipe 31 is fixed to the bulkhead of the cabin 4. This prevents the first pipe 31 from colliding with other cabin 4 structures or obstructing personnel passage.

[0076] In this embodiment, the end of the first pipe 31 is detachably connected to the gearbox 1 via a connector 33. This facilitates the maintenance of the gearbox 1 by disassembling and reassembling the cooling pipes 3 at the front and rear.

[0077] In this embodiment, the end of the first pipe 31 is connected to different pipes on the gearbox 1 via four connectors 33. The gearbox 1 has multiple interfaces corresponding to the first pipe 31 (see Figure 2), which further improves the convenience of disassembling and assembling the cooling pipes. Of course, in other embodiments, the connection method between the first pipe and the gearbox can be adjusted as needed (e.g., screw fit) and connection position (e.g., reducing or increasing the number of connectors).

[0078] This embodiment also provides a wind turbine generator, including the wind turbine nacelle 4 as described above. This improves the heat dissipation of the gearbox 1 and reduces the overall cost of the nacelle 4.

[0079] While specific embodiments of this application have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this application, but all such changes and modifications fall within the scope of protection of this application.

Claims

1. A wind turbine nacelle, comprising a heat dissipation device, a gearbox, cooling pipes, and a nacelle, wherein the heat dissipation device and the gearbox are both located within the nacelle, characterized in that: The cabin walls are equipped with ventilation openings that connect to the outside. The heat dissipation device and the gearbox are separately configured and connected by the cooling pipes. They are respectively fixed by the cabin wall. The heat dissipation device cools the cooling fluid in the cooling pipes and is located near the vent.

2. The wind turbine nacelle as described in claim 1, characterized in that, The vents and the heat dissipation device are both located at the rear of the engine compartment, while the gearbox is located in the middle or front of the engine compartment; and / or, The vent is connected to the heat dissipation device via a sealed air passage; and / or, The ventilation opening is located on the non-top wall of the cabin.

3. The wind turbine nacelle as described in any one of claims 1 and 2, characterized in that, The ventilation opening includes an air inlet and an air outlet.

4. The wind turbine nacelle as described in claim 3, characterized in that, The cabin bulkhead is also provided with air intake and air exhaust channels that run through the bulkhead; The heat dissipation device is connected to the air inlet channel through the air inlet and to the air outlet channel through the air outlet, forming a flow path that flows sequentially through the air inlet channel, the air inlet, the heat dissipation device, the air outlet and the air outlet channel; The air intake duct is arranged diagonally downward and / or downward from inside the cabin to outside the cabin; The air outlet duct is arranged diagonally downwards and / or downwards from inside the cabin to the outside of the cabin.

5. The wind turbine nacelle as described in claim 4, characterized in that, The heat dissipation device includes a cooling fan and a heat exchanger disposed on the flow path, wherein the cooling fan is located upstream of the flow path and the heat exchanger is located downstream of the flow path; The air inlet of the cooling fan is connected to the air inlet channel through the air inlet port, and the connection between the air inlet port and the air inlet channel is sealed. The air outlet of the heat exchanger is connected to the air outlet channel through the air outlet, and the connection between the air outlet and the air outlet channel is sealed.

6. The wind turbine nacelle as described in claim 5, characterized in that, The air intake duct is located on the side wall at the rear of the nacelle, and the air intake opening of the cooling fan faces the outside of the nacelle in a horizontal direction. The air outlet duct is located on the bottom plate at the rear of the nacelle, and the air outlet of the heat exchanger faces the outside of the nacelle in a vertical direction.

7. The wind turbine nacelle as described in any one of claims 1-6, characterized in that, The cooling pipeline includes a first pipe, which is a rigid pipe. The length of the first pipe matches the distance between the gearbox and the heat dissipation device. The first pipe is fixed to the bulkhead of the cabin.

8. The wind turbine nacelle as described in claim 7, characterized in that, The end of the first pipe is detachably connected to the gearbox via a connector; and / or, The cooling pipeline also includes a second pipe, which is a flexible pipe, and the second pipe connects the heat dissipation device and the end of the first pipe.

9. The wind turbine nacelle as described in any one of claims 1-8, characterized in that, The cabin also includes a heat dissipation frame, which is located near the ventilation opening and connected to the cabin wall, and the heat dissipation device is installed on the heat dissipation frame.

10. A wind turbine generator, characterized in that, The wind turbine includes a wind turbine nacelle as described in any one of claims 1-9.

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