Transmission system and semi-direct-drive wind turbine generator

Abstract

The utility model discloses a kind of semi-direct drive wind turbine generator system and semi-direct drive wind turbine generator based on outer rotor main bearing, including hub, front end transmission flange, cabin base, main bearing assembly, gear box and generator, the front and rear ends of front end transmission flange are connected with hub and cabin base respectively, the main bearing assembly is sleeved in the outside of cabin base, and its inner ring is installed with cabin base by interference fit, its outer ring is connected with the rear end of front end transmission flange, the gear box is set in cabin base interior, and the front end of its primary planetary carrier is connected with hub by front end transmission flange, the impeller torque of wind turbine generator is transmitted to the primary planetary carrier of gear box by hub and front end transmission flange, the front end of generator is connected with the rear end of gear box.The utility model integrates and installs main bearing and gear box together, and is composed of compact integrated transmission system structure, greatly shortens load transmission path, so that unit main machine volume is smaller, and weight is lighter.

Description

Technical Field

[0001] This utility model relates to the technical field of wind power generation, and in particular to a semi-direct drive wind turbine transmission system based on an external rotor main bearing and a semi-direct drive wind turbine. Background Technology

[0002] With the development of wind power generation technology, the transmission system structure of wind turbine generators is constantly being optimized. Currently, the transmission system structure using two single-row tapered roller bearings to support the wind turbine is quite common. For example, Chinese invention patent CN204851547U discloses a main bearing assembly for a wind turbine generator, which has a small radial dimension and a large axial dimension, suitable for traditional high-speed transmission, semi-direct drive transmission, and direct drive transmission systems. However, it requires a large main shaft and bearing housing for support and is suitable for units where the inner ring of the main bearing rotates. However, for semi-direct drive wind turbine generators with gearboxes, this structure cannot effectively transmit hub torque to the gearbox because the gearbox requires input torque from the inner rotor. In addition, the load transmission path of the traditional structure is relatively long, resulting in a large size and heavy weight of the wind turbine generator, which is not conducive to the compactness and lightweight development of the unit. Therefore, a new transmission system structure is needed to solve the problems existing in the current technology and achieve a more compact and efficient wind turbine generator design. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a semi-direct drive wind turbine transmission system based on an external rotor main bearing. It adopts a double-row tapered roller bearing as the main bearing, which has a large radial dimension and a small axial dimension. By integrating the main bearing with the gearbox, a compact integrated transmission system structure is formed, which greatly shortens the load transmission path and makes the main unit smaller and lighter.

[0004] Another objective of this invention is to provide a semi-direct drive wind turbine generator set.

[0005] The objective of this utility model can be achieved by adopting the following technical solutions:

[0006] A semi-direct drive wind turbine transmission system based on an external rotor main bearing includes a hub, a front drive flange, a nacelle base, a main bearing assembly, a gearbox, and a generator. The front and rear ends of the front drive flange are connected to the hub and the nacelle base, respectively. The main bearing assembly is fitted onto the outside of the nacelle base, with its inner ring interference-fitted to the nacelle base and its outer ring connected to the rear end of the front drive flange. The gearbox is located inside the nacelle base, and the front end of its first-stage planetary carrier is connected to the hub via the front drive flange. The rotor torque of the wind turbine is transmitted to the first-stage planetary carrier of the gearbox through the hub and the front drive flange. The front end of the generator is connected to the rear end of the gearbox.

[0007] Furthermore, the main bearing assembly adopts a double-row tapered roller bearing.

[0008] Furthermore, a main bearing sealing ring is provided at the rear end of the outer ring of the main bearing assembly, and the main bearing sealing ring is connected to the outer ring of the main bearing assembly and the front drive flange by bolts.

[0009] Furthermore, a main bearing pressure ring for axial positioning of the main bearing assembly is provided between the inner ring of the main bearing assembly, the engine compartment base, and the front transmission flange.

[0010] Furthermore, the wheel hub and the front drive flange are integrally cast.

[0011] Furthermore, the front housing of the gearbox is bolted to the engine compartment base to support the weight of the gearbox and generator.

[0012] Furthermore, the nacelle base is a ductile iron casting with a process hole reserved at its rear end to facilitate generator installation.

[0013] Furthermore, a wind turbine locking hole is provided on the front-end transmission flange, and a wind turbine locking device mounting base is provided on the nacelle base at a position opposite to the wind turbine locking hole.

[0014] Furthermore, it also includes a yaw system, which is located at the bottom of the nacelle base and integrated with the nacelle base.

[0015] Another objective of this utility model can be achieved by adopting the following technical solution:

[0016] A semi-direct drive wind turbine generator set includes the aforementioned semi-direct drive wind turbine generator set transmission system based on an external rotor main bearing.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0018] 1. This utility model integrates the main bearing and gearbox together through the front transmission flange, which significantly shortens the axial length of the transmission chain, reduces the size of the main unit, and makes the main unit small in size and light in weight.

[0019] 2. The impeller torque of this utility model is directly transmitted to the gearbox through the hub and the front flange. In addition to the torque, the load of the impeller is directly transmitted to the nacelle base through the main bearing. The load transmission path is shorter and the utilization rate of structural materials is high, which greatly reduces the weight of the main structure.

[0020] 3. In this utility model, the size of the connection interface between the front transmission flange and the wheel hub is not limited by the size of the main bearing, which is conducive to design optimization and reducing the weight of the wheel hub and the front flange.

[0021] 4. The main bearing of this utility model is directly installed on the engine compartment base. The engine compartment base provides greater support rigidity for the main bearing, making the main bearing less prone to deformation under load. This results in better uniform load distribution on the bearing rollers, and greatly improves the reliability and lifespan of the main bearing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the transmission system of this utility model.

[0023] Figure 2 This is a cross-sectional view of the transmission system of this utility model.

[0024] Figure 3 This is a partial schematic diagram of the transmission system of this utility model.

[0025] Figure 4 This is a schematic diagram of the structure of the wind turbine locking hole and the mounting base of the wind turbine locking device of this utility model. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0027] Example 1:

[0028] like Figures 1 to 4As shown, this embodiment provides a semi-direct drive wind turbine transmission system based on an external rotor main bearing, including a hub 1, a front drive flange 2, a nacelle base 3, a main bearing assembly 4, a gearbox 5, a generator 6, and a yaw system 7. The front and rear ends of the front drive flange 2 are connected to the hub 1 and the nacelle base 3, respectively. A main bearing mounting position 301 is provided on the outer side of the front end of the nacelle base 3. The main bearing assembly 4 is integrated into the main bearing mounting position 301 of the nacelle base 3, making the structure more compact. The inner ring 401 of the main bearing assembly 4 is interference-fitted with the nacelle base 3, and its outer ring 402 is connected to the rear end of the front drive flange 2. The system is bolted together, with the outer ring rotating synchronously with the hub and supporting the wind turbine together. The main bearing assembly 4 can withstand all loads transmitted by the impeller except for torque. The gearbox 5 is located inside the nacelle base 3, and the front end of its first-stage planetary carrier 501 is connected to the hub 1 through the front drive flange 2. The front drive flange 2 allows the main bearing assembly 4 and the gearbox 5 to be compactly integrated together. The impeller torque is transmitted to the first-stage planetary carrier 501 of the gearbox 5 through the hub 1 and the front drive flange 2. The front end of the generator 6 is connected to the rear end of the gearbox 5. The yaw system 7 is located at the bottom of the nacelle base 3 and is integrated with the nacelle base 3.

[0029] The main bearing assembly 4 uses a double-row tapered roller bearing, which can be lubricated by grease or oil. A main bearing sealing ring 9 is located at the rear end of the outer ring 402 of the main bearing assembly 4. The main bearing sealing ring 9 is connected to the outer ring 402 and the front drive flange 2 of the main bearing assembly 4 by bolts. The main bearing sealing ring 9 can adopt a labyrinth or lip seal structure. An oil collection groove structure can be added between the main bearing sealing ring 9 and the engine compartment base 3 to achieve isolation and sealing between the grease lubrication of the main bearing and the oil lubrication of the gearbox. A main bearing pressure ring 10 is provided between the inner ring 401 of the main bearing assembly 4, the engine compartment base 3, and the front drive flange 2 for axial positioning of the inner ring 401.

[0030] The hub 1 and the front drive flange 2 can be connected by bolts or combined into one part, such as by integral casting.

[0031] Gearbox 5 adopts a multi-stage planetary gear transmission structure. Gearbox 5 has its own oil tank, which can be connected to the oil tank for lubrication circulation and cooling via pipeline. The front housing 502 of gearbox 5 is bolted to the engine compartment base 3 to support the weight of gearbox 5 and generator 6.

[0032] The front drive flange 2 is provided with a wind turbine locking hole 201. The nacelle base 3 is provided with a wind turbine locking device mounting base 302 at a position opposite to the wind turbine locking hole. The wind turbine locking device is installed on the wind turbine locking device mounting base 302, and the wind turbine is locked through the wind turbine locking device and the wind turbine locking hole 201.

[0033] The nacelle base 3 is made of ductile iron casting, and its rear end has a process hole for easy installation of the generator 6.

[0034] Example 2:

[0035] This embodiment provides a semi-direct drive wind turbine generator set, including the semi-direct drive wind turbine generator set transmission system based on the external rotor main bearing described in Embodiment 1.

[0036] The above description is only a preferred embodiment of this utility model patent, but the protection scope of this utility model patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this utility model patent, based on the technical solution and utility model patent concept of this utility model patent, shall fall within the protection scope of this utility model patent.

Claims

1. A semi-direct drive wind turbine transmission system based on an external rotor main bearing, characterized in that: The system includes a hub, a front drive flange, a nacelle base, a main bearing assembly, a gearbox, and a generator. The front and rear ends of the front drive flange are connected to the hub and the nacelle base, respectively. The main bearing assembly is fitted onto the outside of the nacelle base, with its inner ring interference-fitted to the nacelle base and its outer ring connected to the rear end of the front drive flange. The gearbox is located inside the nacelle base, and the front end of its first-stage planetary carrier is connected to the hub via the front drive flange. The rotor torque of the wind turbine is transmitted to the first-stage planetary carrier of the gearbox through the hub and the front drive flange. The front end of the generator is connected to the rear end of the gearbox.

2. The semi-direct drive wind turbine transmission system based on an external rotor main bearing according to claim 1, characterized in that: The main bearing assembly uses a double-row tapered roller bearing.

3. The semi-direct drive wind turbine transmission system based on an external rotor main bearing according to claim 1, characterized in that: The outer ring of the main bearing assembly is provided with a main bearing sealing ring at its rear end. The main bearing sealing ring is connected to the outer ring of the main bearing assembly and the front drive flange by bolts.

4. The semi-direct drive wind turbine transmission system based on an external rotor main bearing according to claim 1, characterized in that: A main bearing pressure ring for axial positioning of the main bearing assembly is provided between the inner ring of the main bearing assembly, the engine compartment base, and the front transmission flange.

5. The semi-direct drive wind turbine transmission system based on an external rotor main bearing according to claim 1, characterized in that: The wheel hub and the front drive flange are integrally cast.

6. The semi-direct drive wind turbine transmission system based on an external rotor main bearing according to claim 1, characterized in that: The front housing of the gearbox is bolted to the engine compartment base to support the weight of the gearbox and generator.

7. The semi-direct drive wind turbine transmission system based on an external rotor main bearing according to claim 1, characterized in that: The nacelle base is made of ductile iron casting, with a process hole reserved at its rear end to facilitate generator installation.

8. The semi-direct drive wind turbine transmission system based on an external rotor main bearing according to claim 1, characterized in that: The front-end transmission flange is provided with a wind turbine locking hole, and the nacelle base is provided with a wind turbine locking device mounting base at a position opposite to the wind turbine locking hole.

9. The semi-direct drive wind turbine transmission system based on an external rotor main bearing according to claim 1, characterized in that: It also includes a yaw system, which is located at the bottom of the nacelle base and integrated with the nacelle base.

10. A semi-direct drive wind turbine generator set, characterized in that: The system includes the semi-direct drive wind turbine transmission system based on an external rotor main bearing as described in any one of claims 1 to 9.

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