Wind generating set

Abstract

The invention provides a wind generating set, and relates to the technical field of wind power equipment. On the premise of ensuring transmission efficiency and reliability, the length of a transmission chain and the total mass of a tower top can be effectively shortened, and the requirement for reducing the cost of a transmission chain system and a tower footing is met. The wind generating set comprises a hub, a generator and a gear box. Wherein an opening is formed in the hub; at least part of the generator is located outside the hub and located on the side close to the opening. At least part of the gear box is located in the hub, a first transmission connecting part and a second transmission connecting part are arranged on the gear box, and the first transmission connecting part and the second transmission connecting part are in transmission connection with the hub and the generator respectively. The first transmission connecting part is located in the hub and located at the end, close to the opening, of the gear box. The wind generating set is used for effectively shortening the length of the transmission chain and the total mass of the tower top.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of wind power equipment technology, and particularly to a wind turbine generator set. Background Technology

[0002] As wind turbines develop towards larger megawatts and higher torque, the size and weight of the rotors are also increasing. This has caused the total weight of the traditional drivetrain, consisting of a low-speed main shaft and gearbox, to exceed transportation and installation limits. This not only affects logistics but also restricts the performance improvement of the entire turbine. To meet greater demand while solving the weight and size limitations, new drivetrain designs need to be developed.

[0003] However, existing transmission chain structures typically place the wind turbine's gearbox within the nacelle, with the gearbox connected to the impeller via the hub and main shaft. This results in a complex structure with numerous, large, and intricately arranged components. Furthermore, the existing layout increases the overall weight of the turbine due to the main shaft and large nacelle, placing high demands on the tower, foundation bearing capacity, and component transportation and hoisting. Summary of the Invention

[0004] The purpose of this invention is to provide a wind turbine generator set that addresses the problems of low transmission efficiency and reliability caused by the large size and overall mass of existing technologies.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide a wind turbine generator set, comprising: a hub, a generator, and a gearbox; wherein, the hub has an opening; at least a portion of the generator is located outside the hub and on a side close to the opening; at least a portion of the gearbox is located inside the hub, and the gearbox is provided with a first transmission connection portion and a second transmission connection portion, the first transmission connection portion and the second transmission connection portion being respectively transmissionally connected to the hub and the generator, the first transmission connection portion being located inside the hub and at the end of the gearbox close to the opening.

[0006] In some embodiments, the connection device includes: the wind turbine generator set further includes a nacelle located on the side of the hub near the opening, at least a portion of the generator is located inside the nacelle, and a portion of the gearbox is located outside the hub and connected to the nacelle.

[0007] In some embodiments, the gearbox includes a first-stage planetary carrier, a first-stage sun gear, first-stage planet gears, and a first-stage ring gear; the first-stage sun gear and the first-stage planet gears are disposed on the first-stage planetary carrier, the first-stage planet gears mesh with the first-stage sun gear and the first-stage ring gear, and the first transmission connection part is the first-stage ring gear.

[0008] In some embodiments, the wind turbine generator set further includes a nacelle located on the side of the hub near the opening, at least a portion of the generator being located within the nacelle, and the end of the first-stage planetary carrier near the generator being located outside the hub and connected to the nacelle.

[0009] In some embodiments, the second transmission connection is disposed at the end of the gearbox away from the opening.

[0010] In some embodiments, the gearbox includes a final stage planetary carrier, a final stage sun gear, final stage planet gears, and a final stage ring gear; the final stage sun gear and the final stage planet gears are disposed on the final stage planetary carrier, the final stage planet gears mesh with the final stage sun gear and the final stage ring gear, and the second transmission connection part is the final stage sun gear.

[0011] In some embodiments, the gearbox includes a secondary planetary carrier, a secondary sun gear, secondary planet gears, and a secondary ring gear; the secondary planetary carrier is disposed between the primary planetary carrier and the final planetary carrier, the secondary sun gear and the secondary planet gears are disposed on the secondary planetary carrier, and the secondary planet gears mesh with the secondary sun gear and the secondary ring gear.

[0012] In some embodiments, a first connector is provided between the secondary planetary carrier and the primary sun gear, the first connector connecting the secondary planetary carrier and the primary sun gear; a second connector is provided between the secondary sun gear and the final planetary carrier, the second connector connecting the secondary sun gear and the final planetary carrier.

[0013] In some embodiments, one end of the first connector is mounted on the side of the first-stage sun gear away from the generator, and the other end of the first connector is inserted into the second-stage planetary carrier and the two are slidably connected.

[0014] In some embodiments, one end of the second connector is mounted on the side of the second-stage sun gear away from the generator, and the other end of the second connector is inserted into the final-stage planetary carrier and the two are slidably connected.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a wind turbine generator set. Due to the inclusion of a hub, which provides mounting points for other components and drives at least a portion of the gearbox via its movement, the hub includes a first transmission connection and a second transmission connection. As the hub rotates, it drives the first transmission connection, which in turn drives the generator via the second transmission connection, thereby converting mechanical energy into electrical energy. By installing the first and second transmission connections inside the hub and by configuring the gearbox with a staged transmission system, this invention effectively shortens the transmission chain length and the total mass at the top of the tower, meeting the need to reduce the cost of the transmission chain system and tower base. Furthermore, it improves the transmission efficiency and reliability in the process of converting mechanical energy into electrical energy. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0017] Figure 1 This is a schematic diagram of the overall structure of a wind turbine generator set according to the present invention; Figure 2 for Figure 1 Another structural diagram.

[0018] Explanation of reference numerals in the accompanying drawings of this invention: 1-Hub; 2-Gearbox; 21-Support frame; 22-First stage gear ring; 23-Front housing; 3-Generator; 411-First stage planetary carrier; 412-First stage planetary gear; 413-First stage sun gear; 421-Middle housing; 422-Second stage gear ring; 423-Second stage planetary carrier; 424-Second stage planetary gear; 425-Second stage sun gear; 431-Rear housing; 432-Final stage gear ring; 433-Final stage planetary carrier; 434-Final stage planetary gear; 435-Final stage sun gear; 5-First connecting piece; 6-Second connecting piece; 7-First stage gear ring bearing; 8-Second stage planetary carrier bearing; 9-Final stage planetary carrier bearing; 10-Nacelle; 11-Opening.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] This invention provides a wind turbine generator set, such as Figure 1 As shown, the wind turbine generator set includes: a hub 1, a generator 3, and a gearbox 2; wherein, the hub 1 is provided with an opening 11; at least a portion of the generator 3 is located outside the hub 1 and on the side near the opening 11; at least a portion of the gearbox 2 is located inside the hub 1, and the gearbox 2 is provided with a first transmission connection part and a second transmission connection part, the first transmission connection part and the second transmission connection part being respectively connected to the hub 1 and the generator 3, the first transmission connection part being located inside the hub 1 and at the end of the gearbox 2 near the opening 11.

[0024] In this embodiment, the wind turbine generator set can be configured as a structure including a hub 1, a generator 3, and a gearbox 2. The hub 1 has an opening 11, which can be understood as a receiving cavity within the hub 1, closed at one end and open at the other. Part of the generator 3 is located outside the hub 1, near the open side. Part of the gearbox 2 is located inside the hub 1, and the remaining part is located outside the hub 1. The gearbox 2 has a first transmission connection and a second transmission connection. The first transmission connection is located at the end of the gearbox 2 near the opening 11 and connected to the hub 1, and is also located inside the hub 1. The second transmission connection is connected to the input end of the generator 3.

[0025] For example, a wind turbine generator set includes a hub 1, and a receiving cavity is provided inside the hub 1. The size of the receiving cavity can be set according to the size of the parts to be placed in the receiving cavity. One end of the receiving cavity is closed and the other end is open. That is, one end of the hub 1 is closed and the opening 11 of the hub 1 is the opening of the receiving cavity.

[0026] In another example, the generator 3 can be mounted on the nacelle 10, which supports the generator 3 and other components. The nacelle 10 is located on the side near the opening 11 of the hub 1. Part of the generator 3 structure is mounted on the nacelle 10, and another part is mounted inside the hub 1; for example, the generator 3 body is mounted on the nacelle 10, and part of the generator 3's input shaft is located inside the hub 1, while another part is located outside the hub 1. Furthermore, some components of the gearbox 2 are located outside the hub 1, and these components located outside the hub 1 are mounted on the nacelle 10.

[0027] In this embodiment, the first and second transmission connection parts in the gearbox 2 can achieve multi-stage transmission, or graded transmission. The end of the graded transmission, that is, the transmission part on the gearbox 2 inside the hub 1 furthest from the generator 3, connects to the generator 3, thereby converting mechanical energy into electrical energy. It should be noted that other transmission connection parts can be provided between the first and second transmission connection parts to achieve graded transmission. Graded transmission can be three-stage, four-stage, etc. In this embodiment, the number of stages of graded transmission is not specifically limited; it can be set according to the actual situation.

[0028] In the above embodiments, the hub 1 provides mounting points for other parts and drives at least a portion of the gearbox 2 to move through its movement. With the first and second transmission connections, the hub 1 rotates, driving the first transmission connection to move, which in turn drives the generator 3 via the second transmission connection, thus converting mechanical energy into electrical energy. This invention, by installing the first and second transmission connections inside the hub 1 and by configuring the gearbox 2 as a staged transmission system, effectively shortens the transmission chain length and total tower mass in the wind turbine generator set, meeting the need to reduce the cost of the transmission chain system and tower base; and improves the transmission efficiency and reliability in the process of converting mechanical energy into electrical energy.

[0029] In some embodiments of this application, the gearbox 2 includes: a primary planetary carrier 411, a primary sun gear 413, a primary planetary gear 412, and a primary ring gear (22); the primary sun gear 413 and the primary planetary gear 412 are disposed on the primary planetary carrier 411, and the primary planetary gear 412 meshes with the primary sun gear 413 and the primary ring gear 22. The first transmission connection part is the primary ring gear (22). The gearbox 2 is provided with a front housing 23, a middle housing 421, and a rear housing 431, which are arranged sequentially along the direction away from the generator 3. The primary ring gear 22 is disposed on the outside of the primary planetary carrier 411 and is connected to the front housing 23. The end of the primary planetary carrier 411 near the generator 3 is located on the outside of the hub 1 and is mounted on the engine compartment 10. The primary ring gear 22 is connected to a support frame 21, which is located inside the hub 1 near the opening 11 and is connected to the hub 1. Furthermore, the second transmission connection is located on the side of the gearbox 2 away from the opening 11.

[0030] For example, one end of the first-stage planetary carrier 411 is connected to the nacelle 10 of the generator 3, and the other end is placed in the receiving cavity. The first-stage planetary gear 412 is mounted on the first-stage planetary carrier 411 and meshes with the first-stage ring gear 22. The rotation of the first-stage ring gear 22 can drive the first-stage planetary gear 412 to rotate. A first-stage sun gear 413 is provided inside the first-stage planetary carrier 411 and is mounted on the first-stage planetary carrier 411. The axes of the first-stage sun gear 413, the first-stage ring gear 22, and the input end of the generator 3 are coincident or nearly coincident. The first-stage sun gear 413 meshes with the first-stage planetary gear 412, and the rotation of the first-stage planetary gear 412 can drive the first-stage sun gear 413 to rotate.

[0031] The primary planetary carrier 411 has a primary gear ring bearing 7 installed on its outer side. This bearing 7 is mounted between the support frame 21, the primary gear ring 22, the front housing 23, and the primary planetary carrier 411. It is understood that the primary planetary carrier 411, the secondary gear ring 422, the middle housing 421, the final gear ring 432, and the final planetary carrier 433 can be assembled from parts or manufactured as a single piece, depending on the specific requirements of the design, as long as it meets the requirements for normal operation.

[0032] In the above embodiment, the support frame 21 serves as a connection, enabling the hub 1 to drive the primary gear ring 22. The primary gear ring 22 also acts as a transmission mechanism, driving the primary planetary gear 412. The front housing 23 provides support and assistance to the primary gear ring 22 and the support frame 21, improving the stability of the support frame 21 and the primary gear ring 22 as they rotate with the hub 1. The primary planetary gear 412 drives the primary sun gear 413, which in turn drives other connected components.

[0033] In this embodiment, the gearbox 2 includes a final stage planetary carrier 433, a final stage sun gear 435, a final stage planetary gear 434, and a final stage ring gear 432; the final stage sun gear 435 and the final stage planetary gear 434 are disposed on the final stage planetary carrier 433, the final stage planetary gear 434 meshes with the final stage sun gear 435 and the final stage ring gear 432, and the second transmission connection part is the final stage sun gear 435.

[0034] For example, the rear housing 431 is mounted on the end of the middle housing 421 away from the generator 3. The final stage ring gear 432 is mounted on the rear housing 431, and the axis of the final stage ring gear 432 coincides with or nearly coincides with the axis of the first stage ring gear 22. The final stage planetary gear 434 meshes with the final stage ring gear 432, and the final stage planetary gear 434 is mounted on the final stage planet carrier 433, which is installed inside the rear housing 431. The final stage sun gear 435 meshes with the final stage planetary gear 434, and the axis of the final stage sun gear 435 coincides with or nearly coincides with the axis of the first stage sun gear 413.

[0035] Furthermore, an auxiliary component, such as a final-stage planetary carrier bearing 9, may be provided between the final-stage planetary carrier 433 and the rear housing 431. The final-stage planetary carrier 433 rotates relative to the rear housing 431 with the assistance of the final-stage planetary carrier bearing 9.

[0036] In the above embodiment, the final-stage planetary carrier 433 provides support for the final-stage planetary gears 434. The final-stage planetary gears 434 drive the final-stage sun gear 435 to rotate, and by reversing the final-stage sun gear 435 and connecting it to the generator 3, the generator 3 is driven to operate. This configuration, by placing the output end of the gearbox 2 on the side furthest from the generator 3 and connecting it to the generator 3, effectively shortens the transmission chain length and the total mass at the top of the tower in the wind turbine generator set, meeting the requirement of reducing the cost of the transmission chain system and tower base; and it can also improve transmission efficiency and stability during transmission to a certain extent.

[0037] In this embodiment, the gearbox 2 includes a secondary ring gear 422, a secondary planetary gear 424, a secondary planetary carrier 423, and a secondary sun gear 425. The secondary planetary carrier 423 is disposed between the primary planetary carrier 411 and the final planetary carrier 433. The secondary sun gear 425 and the secondary planetary gear 424 are disposed on the secondary planetary carrier 423, and the secondary planetary gear 424 meshes with the secondary sun gear 425 and the secondary ring gear 422.

[0038] For example, the second-stage planetary gear 424 meshes with the second-stage ring gear 422, and the second-stage planetary gear 424 is mounted on the second-stage planetary carrier 423, which is located inside the middle housing 421. Furthermore, the second-stage sun gear 425 meshes with the second-stage planetary gear 424, and the axes of the second-stage sun gear 425 and the first-stage sun gear 413 coincide or nearly coincide.

[0039] Furthermore, an auxiliary component, such as a secondary planetary carrier bearing 8, can be provided between the secondary planetary carrier 423 and the intermediate housing 421. The secondary planetary carrier 423 rotates relative to the intermediate housing 421 with the assistance of the secondary planetary carrier bearing 8.

[0040] In the above embodiment, the secondary planetary carrier 423 provides support for the secondary planetary gears 424 and the secondary sun gear 425. The secondary planetary gears 424 drive the secondary sun gear 425. The secondary sun gear 425 connects to the final-stage planetary carrier 433, driving its movement. This connects the first and second transmission connection parts, achieving graded transmission of the primary gear ring 22, the secondary sun gear 425, and the final-stage sun gear 435. This configuration effectively shortens the transmission chain length and total tower mass in the wind turbine generator set, meeting the need to reduce the cost of the transmission chain system and tower base. Furthermore, the mechanical parts within the hub 1 can be hoisted and replaced as a whole, further reducing installation and maintenance costs and improving work efficiency.

[0041] In this embodiment, the primary sun gear 413 is connected to the secondary planetary carrier 423 via a first connector 5, thereby driving the secondary planetary carrier 423 to move. The first connector 5 has a first insertion structure on its outer side, which can be a spline. The first connector 5 is connected to the secondary planetary carrier 423 via the spline, thereby driving the secondary planetary carrier 423 to rotate. Furthermore, the first connector 5 has a first clearance portion, which can be a through hole. The axis of the through hole is parallel or nearly parallel to the axis of the input end of the generator 3. The through hole can communicate with the inner hole of the primary sun gear 413.

[0042] For example, the first connector 5 and the first-stage sun gear 413 can be manufactured as a single piece or can be composed of two parts. The first-stage sun gear 413 can drive the second-stage planetary carrier 423 to rotate without affecting the third transmission mechanism 43 driving the generator 3 to move.

[0043] In the above embodiment, the first connecting member 5 is provided to connect the first-stage sun gear 413 and the second-stage planetary carrier 423, so that the first-stage sun gear 413 can drive the second-stage planetary carrier 423 to move. The structure is simple, flexible and convenient.

[0044] In this embodiment, a second connector 6 is provided between the second-stage sun gear 425 and the final-stage planetary carrier 433. The second-stage sun gear 425 drives the final-stage planetary carrier 433 to rotate via the second connector 6. A second insertion structure, which can be a spline, is provided on the outer side of the second connector 6. The second connector 6 is connected to the final-stage planetary carrier 433 via the spline, thereby driving the final-stage planetary carrier 433 to rotate. Furthermore, a second clearance portion, which can be a through hole, is provided inside the second connector 6. The axis of the through hole is parallel or nearly parallel to the axis of the input end of the generator 3. The through hole can communicate with the inner hole of the second-stage sun gear 425.

[0045] For example, the second connector 6 and the second-stage sun gear 425 can be manufactured as a single piece or can be composed of two parts. The second-stage sun gear 425 can drive the final-stage planetary carrier 433 to rotate without affecting the operation of the generator 3 driven by the final-stage sun gear 435.

[0046] In the above embodiment, the second connector 6 is provided, which can connect the second-stage sun gear 425 and the last-stage planetary carrier 433. This allows the second-stage sun gear 425 to drive the last-stage planetary carrier 433 to move through the second connector 6. The connection function can be achieved with a simple structure, which is convenient for disassembly and assembly and improves work efficiency.

[0047] With this configuration, the first-stage sun gear 413, the first connecting member 5, the second-stage sun gear 425, and the second connecting member 6 are all internally connected. A connecting shaft can be provided between the final-stage sun gear 435 and the input terminal of the generator 3. The final-stage sun gear 435 can be connected to the generator 3 through the connecting shaft, thereby converting mechanical energy into electrical energy. Alternatively, the final-stage sun gear 435 can be connected to the input terminal of the generator 3, and the rotation of the final-stage sun gear 435 can then convert mechanical energy into electrical energy.

[0048] Another example, such as Figure 2As shown, a wind turbine generator set according to an embodiment of this application includes another structure: the end of the first-stage planetary carrier 411 located outside the receiving cavity can be installed on the nacelle 10 of the generator 3, and the support frame 21, first-stage gear ring 22, front housing 23, middle housing 421, second-stage gear ring 422, rear housing 431, and final-stage gear ring 432 are all installed inside the receiving cavity. Specifically, the end of the first-stage planetary carrier 411 away from the generator 3 is connected to the front housing 23, the front housing 23 is connected to the first-stage gear ring 22, the first-stage gear ring 22 is connected to the support frame 21, and the support frame 21 is connected to the hub 1. The end of the front housing 23 away from the first-stage planetary carrier 411 is connected to the middle housing 421, and the middle housing 421 is connected to the second-stage gear ring 422. The end of the middle housing 421 away from the support frame 21 is connected to the rear housing 431, and the rear housing 431 is connected to the final-stage gear ring 432.

[0049] In the above embodiments, without changing the original parts and the achieved effect, by adjusting the connection relationship between the first-stage planetary carrier 411, the front housing 23, and the middle housing 421, different connection methods are provided for the staff, which facilitates the staff to manufacture, assemble, and maintain according to the actual situation, thereby expanding the application range of the wind turbine generator set and improving work efficiency.

[0050] The following describes the usage process of the wind turbine generator set provided in this application: like Figure 1 As shown, the movement process of one of the structures is as follows: First, the first-stage planetary carrier 411, the second-stage gear ring 422, the middle housing 421, the final-stage gear ring 432, and the rear housing 431 are connected in sequence and fixedly connected to the flange of the generator 3 nacelle 10. The hub 1 and the first-stage gear ring 22 are fixedly connected through the support frame 21. During rotation, hub 1 drives support frame 21 to move, support frame 21 drives first-stage gear ring 22 to move, first-stage gear ring 22 drives front housing 23 to move. During the movement, first-stage gear ring 22 transmits power to first-stage sun gear 413 through first-stage planetary gear 412. First-stage sun gear 413 inputs power to second-stage planetary carrier 423 through first connector 5. Second-stage planetary carrier 423 outputs power to second-stage sun gear 425 through second-stage planetary gear 424. Second-stage sun gear 425 inputs power to last-stage planetary carrier 433 through second connector 6. Last-stage planetary carrier 433 outputs power to the reversed last-stage sun gear 435 through last-stage planetary gear 434. Last-stage sun gear 435 is connected to generator 3, completing the conversion of mechanical energy to electrical energy.

[0051] like Figure 2As shown, the motion process of another structure is as follows: First, the first-stage planetary carrier 411 and the generator 3 nacelle 10 flange are fixedly connected. The hub 1, support frame 21, first-stage gear ring 22, front housing 23, second-stage gear ring 422, middle housing 421, final-stage gear ring 432, and rear housing 431 are connected in sequence and rotate together with the hub 1 under the action of wind. The first-stage ring gear 22 outputs power to the first-stage sun gear 413 through the first-stage planetary gear 412. The first-stage sun gear 413 drives the second-stage planetary carrier 423 through the first connecting member 5, outputting power to the second-stage planetary carrier 423. The second-stage ring gear 422 and the second-stage planetary carrier 423 output power to the second-stage sun gear 425 through the second-stage planetary gear 424. The second-stage sun gear 425 drives the final-stage planetary carrier 433 through the second connecting member 6, outputting power to the final-stage planetary carrier 433. The final-stage ring gear 432 and the final-stage planetary carrier 433 output power to the reversed final-stage sun gear 435 through the final-stage planetary gear 434. The final-stage sun gear 435 is connected to the generator 3, completing the conversion of mechanical energy into electrical energy.

[0052] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A wind turbine generator set, characterized in that, include: A hub (1) having an opening (11). A generator (3), at least a portion of which is located outside the hub (1) and on the side close to the opening (11); The gearbox (2) has at least a portion located inside the hub (1). The gearbox (2) is provided with a first transmission connection part and a second transmission connection part. The first transmission connection part and the second transmission connection part are respectively connected to the hub (1) and the generator (3). The first transmission connection part is located inside the hub (1) and at one end of the gearbox (2) near the opening (11).

2. The wind turbine generator set according to claim 1, characterized in that, The wind turbine generator set also includes a nacelle (10) located on the side of the hub (1) near the opening (11), at least a portion of the generator (3) is located inside the nacelle (10), and a portion of the gearbox (2) is located outside the hub (1) and connected to the nacelle (10).

3. The wind turbine generator set according to claim 1, characterized in that, The gearbox (2) includes a first-stage planetary carrier (411), a first-stage sun gear (413), a first-stage planetary gear (412), and a first-stage ring gear (22); the first-stage sun gear (413) and the first-stage planetary gear (412) are mounted on the first-stage planetary carrier (411), and the first-stage planetary gear (412) meshes with the first-stage sun gear (413) and the first-stage ring gear (22). The first transmission connection part is the first-stage ring gear (22).

4. The wind turbine generator set according to claim 3, characterized in that, The wind turbine generator set also includes a nacelle (10) located on the side of the hub (1) near the opening (11), at least a portion of the generator (3) is located inside the nacelle (10), and the end of the first-stage planetary carrier (411) near the generator (3) is located outside the hub (1) and connected to the nacelle (10).

5. The wind turbine generator set according to claim 3, characterized in that, The second transmission connection is located at the end of the gearbox (2) away from the opening (11).

6. The wind turbine generator set according to claim 5, characterized in that, The gearbox (2) includes a final stage planetary carrier (433), a final stage sun gear (435), a final stage planetary gear (434), and a final stage ring gear (432); the final stage sun gear (435) and the final stage planetary gear (434) are mounted on the final stage planetary carrier (433), and the final stage planetary gear (434) meshes with the final stage sun gear (435) and the final stage ring gear (432), and the second transmission connection part is the final stage sun gear (435).

7. The wind turbine generator set according to claim 6, characterized in that, The gearbox (2) includes a secondary planetary carrier (423), a secondary sun gear (425), a secondary planetary gear (424), and a secondary ring gear (422). The secondary planetary carrier (423) is disposed between the primary planetary carrier (411) and the final planetary carrier (433). The secondary sun gear (425) and the secondary planetary gear (424) are disposed on the secondary planetary carrier (423). The secondary planetary gear (424) meshes with the secondary sun gear (425) and the secondary ring gear (422).

8. The wind turbine generator set according to claim 7, characterized in that, A first connector (5) is provided between the secondary planetary carrier (423) and the primary sun gear (413), the first connector (5) connecting the secondary planetary carrier (423) and the primary sun gear (413); a second connector (6) is provided between the secondary sun gear (425) and the final planetary carrier (433), the second connector (6) connecting the secondary sun gear (425) and the final planetary carrier (433).

9. The wind turbine generator set according to claim 8, characterized in that, One end of the first connector (5) is installed on the side of the first-stage sun gear (413) away from the generator (3), and the other end of the first connector (5) is inserted into the second-stage planetary carrier (423) and the two are slidably connected.

10. The wind turbine generator set according to claim 8, characterized in that, One end of the second connector (6) is installed on the side of the second-stage sun gear (425) away from the generator (3), and the other end of the second connector (6) is inserted into the final-stage planetary carrier (433) and the two are slidably connected.

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