Transmission chain structure and wind turbine generator system

Abstract

The utility model discloses a kind of transmission chain structure and wind turbine unit, including split main shaft axle system, main bearing system, fan hub, cabin elbow and gear box generator system, the split main shaft axle system includes connecting member and input shaft, the front end of the connecting member is connected with fan hub, its rear end is set towards gear box generator system, the input shaft is concentrically arranged at the center of connecting member, its front end is connected with the front end of connecting member, its rear end is extended to the rear and is connected with the front end input shaft of gear box generator system, the main bearing system is arranged at the outside of connecting member, and is rotatably connected with connecting member, the cabin elbow is arranged at the outside of gear box generator system, and its front end is connected with main bearing system. The utility model can effectively solve the problem that the weight of traditional half direct drive transmission chain structure main shaft axle system is heavy, cost is high, deformation is big, transportation is difficult and other problems due to complex stress.

Description

Technical Field

[0001] This utility model relates to the technical field of large-megawatt wind turbines, and in particular to a transmission chain structure and a wind turbine generator set. Background Technology

[0002] The market demand for large-megawatt wind turbines is increasing. With the rising demand for power generation, the required wind turbine drivetrains are becoming larger. To reduce turbine size, companies have proposed ultra-compact semi-direct-drive designs. However, as turbine sizes increase, the main shaft system of traditional ultra-compact semi-direct-drive drivetrains becomes heavier and more expensive due to increased load requirements, while also significantly increasing transportation difficulties. Furthermore, the complex hub loads concentrated on the main shaft system exacerbate deformation, reduce service life, and severely hinder the further development of large-megawatt wind turbines. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a transmission chain structure that uses a split main shaft system composed of a small-diameter input shaft and connecting components. This can effectively solve the problems of large weight, high cost, large deformation, and difficult transportation caused by the complex force of the main shaft system of the transmission chain structure in traditional semi-direct drive models.

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

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

[0006] A transmission chain structure includes a split-type main shaft system, a main bearing system, a wind turbine hub, a nacelle elbow, and a gearbox generator system. The split-type main shaft system includes a connecting member and an input shaft. The front end of the connecting member is connected to the wind turbine hub, and its rear end faces the gearbox generator system. The input shaft is concentrically located at the center of the connecting member, with its front end connected to the front end of the connecting member and its rear end extending through the connecting member and connecting to the front input shaft of the gearbox generator system. The split-type main shaft system splits the torque load and bending moment load transmitted from the wind turbine hub, and the torque load is transmitted to the gearbox generator system through the input shaft. The main bearing system is located outside the connecting member and is rotatably connected to the connecting member. The nacelle elbow is located outside the gearbox generator system, with its front end connected to the main bearing system. The bending moment load is transmitted to the nacelle elbow through the connecting member and the main bearing system.

[0007] Furthermore, the main bearing system includes a bearing housing and a bearing assembly disposed inside the bearing housing. The bearing housing is fixedly connected to the nacelle elbow. The bearing assembly is two tapered roller bearings, or a single double-row tapered roller bearing, or a single three-row cylindrical roller bearing.

[0008] Furthermore, when the bearing assembly consists of two tapered roller bearings, the connecting member is a hollow truncated cone structure, with its large end connected to the wind turbine hub and its small end facing the gearbox generator system. Bearing mounting positions are provided on the outer circumferential surfaces of its front and rear ends, and the two tapered roller bearings are respectively mounted on the two bearing mounting positions.

[0009] Furthermore, when the bearing assembly is a single double-row tapered roller bearing or a single three-row cylindrical roller bearing, the connecting member includes a tapered cylindrical section and a cylindrical section connected together. The large end of the tapered cylindrical section is connected to the fan hub, and its small end is connected to the cylindrical section. The inner and outer surfaces of the connection between the small end and the cylindrical section are flush. The outer circumferential surface of the cylindrical section is provided with a bearing mounting position for installing the double-row tapered roller bearing or the three-row cylindrical roller bearing.

[0010] Furthermore, the connecting component is a one-piece molded structure.

[0011] Furthermore, the input shaft is cylindrical, with its front end flush with the front end of the connecting member and connected by bolts, and its rear end connected to the front input shaft via a spline structure or coupling.

[0012] Furthermore, a stop structure is provided between the connecting member and the input shaft to facilitate their mutual cooperation.

[0013] Furthermore, the rear of the nacelle bend is provided with a sloping open structure to facilitate the maintenance of the gearbox generator system.

[0014] Furthermore, the gearbox generator system includes a gearbox and a generator, the generator being connected to the rear output shaft of the gearbox, and the outer casing of the gearbox being bolted to the nacelle elbow.

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

[0016] A wind turbine generator set includes the aforementioned drive train structure.

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

[0018] 1. This utility model adopts a split main shaft system composed of a small-diameter input shaft and connecting components. By diverting the load at the hub center, the bending moment is transmitted to the engine compartment bend through the connecting components and the main bearing system, and the torque is input to the gearbox and generator through the input shaft to generate electricity. This effectively avoids deformation caused by excessive load on the main shaft system, and the weight of the main unit can be reduced by more than 5%, the weight of the main shaft system can be reduced by 10%, the cost can be reduced, and the transportation difficulty can be greatly reduced.

[0019] 2. The rear of the engine compartment bend of this utility model adopts a large open design, which allows for the on-site replacement of large components such as motors and gearboxes, greatly reducing the maintenance difficulty of gearboxes and generators. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the transmission chain in Example 1.

[0021] Figure 2 This is a schematic diagram of the connection between the nacelle elbow and the bearing housing in Example 1.

[0022] Figure 3 This is a schematic diagram of the split spindle system in Example 1.

[0023] Figure 4 This is a schematic diagram of the connection between the connecting component and the wind turbine hub in Example 1.

[0024] Figure 5 This is a schematic diagram of the connection between the input shaft and the gearbox in Example 1.

[0025] Figure 6 This is a schematic diagram of the connection between the gearbox and the generator in Example 1.

[0026] Figure 7 This is a schematic diagram of the nacelle bend in Example 1.

[0027] Figure 8 This is an assembly diagram of the transmission chain structure in Example 1.

[0028] Figure 9 This is a schematic diagram of the overall structure of the transmission chain in Example 2.

[0029] Figure 10 This is a cross-sectional view of the split spindle system in Example 2.

[0030] Figure 11 This is a schematic diagram of the split spindle system in Example 2.

[0031] Figure 12 This is a partial schematic diagram of the transmission chain structure in Example 2. Detailed Implementation

[0032] 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.

[0033] Example 1:

[0034] like Figure 1 As shown, this embodiment provides a transmission chain structure, including a split main shaft system 1, a main bearing system 2, a wind turbine hub 3, a nacelle elbow 4, and a gearbox generator system. The split main shaft system 1 includes a connecting member 101 and an input shaft 102. The front end of the connecting member 101 is connected to the wind turbine hub 3, and its rear end is set towards the gearbox generator system. The input shaft 102 is concentrically set at the center of the connecting member 101, and its front end is connected to the front end of the connecting member 101. Its rear end extends backward through the connecting member 101 and is connected to the front input shaft 502 of the gearbox generator system. The main bearing system 2 is set outside the connecting member 101 and is rotatably connected to the connecting member 101. The nacelle elbow 4 is set outside the gearbox generator system, and its front end is connected to the main bearing system 2. When the impeller system absorbs wind energy to drive the wind turbine hub 3 to rotate, the torque load and bending moment load transmitted from the wind turbine hub 3 are split through the split main shaft system 1. The torque load is transmitted to the gearbox generator system to generate electrical energy through the input shaft 102, and the bending moment load is transmitted to the nacelle elbow 4 through the connecting component 101 and the main bearing system 2.

[0035] The main bearing system 2 includes a bearing housing 202 and a bearing assembly disposed within the bearing housing 202. The bearing assembly consists of two tapered roller bearings 201. The bearing housing 202 is rotatably connected to the connecting member 101 via the two tapered roller bearings 201, and the bearing housing 202 is fixedly connected to the engine room elbow 4. Figure 2 As shown.

[0036] like Figure 3 , Figure 4 As shown, the connecting member 101 is a hollow frustum-shaped structure, with its large end connected to the wind turbine hub 3 and its small end facing the gearbox generator system. To facilitate the hoisting of the split-type main shaft system 1, a lifting lug 1011 is provided at the edge of the large end of the connecting member 101. Bearing mounting positions 1012 are respectively provided on the outer circumferential surfaces of the front and rear ends of the connecting member 101. Two tapered roller bearings 201 are respectively mounted on the two bearing mounting positions 1012. Alternatively, the tapered roller bearings can be replaced with angular contact bearings, double-row or multi-row tapered roller bearings, single-row or multi-row cylindrical roller bearings, or self-aligning bearings, depending on actual requirements.

[0037] The input shaft 102 is cylindrical, and its outer diameter and length are affected by the wind turbine's power generation. For a 10MW model, its outer diameter is approximately 1.3m to 3m, and its length ranges from 0 to 2m. For a 20MW model, its outer diameter is approximately 1.3m to 4.5m, and its length ranges from 0 to 4m. The front end of the input shaft is flush with the front end of the connecting member 101 and connected by bolts 103. Its rear end is connected to the front input shaft via a spline structure 1021 or a coupling. Figure 5 As shown.

[0038] To facilitate the assembly of the connecting member 101 and the input shaft 102, a stop structure 1013 is provided between the connecting member 101 and the input shaft 102 to facilitate their mutual cooperation.

[0039] like Figure 6 As shown, the gearbox generator system includes a gearbox 5 and a generator 6. The generator 6 is connected to the rear output shaft 503 of the gearbox 5. The generator 6 does not include a bearing system; its core components are the rotor, stator, and cooling system. The nacelle elbow 4 is connected to the outer casing 501 of the gearbox 5 by bolts, or a combination of bolts and rigid pins can be used for connection.

[0040] like Figure 7 As shown, the rear of the nacelle bend 4 is provided with a sloping open structure 401 to facilitate the maintenance of the gearbox generator system. The gearbox generator system is located inside the nacelle bend 4. When the gearbox 5 or generator 6 malfunctions and needs to be replaced, it is not necessary to remove the entire transmission chain from the tower for replacement. The gearbox 5 or generator 6 can be removed from the sloping open structure for replacement.

[0041] like Figure 8 As shown, the installation method of the transmission chain structure in this embodiment is as follows:

[0042] S1. With the connecting component at the bottom and the input shaft at the top, align the bolt holes and stop structures of the two components, and connect them with bolts to complete the assembly of the split spindle system.

[0043] S2. Place the split spindle system upside down on the tooling bracket and install the main bearing system. After installation, set the split spindle system with the contact surface with the wind turbine hub facing down and the connection surface with the gearbox generator system facing up.

[0044] S3. Place the nacelle elbow horizontally, hoist the split main shaft system so that its central axis is horizontal and installed with the nacelle elbow, align the corresponding bolt holes and installation stops on the mounting flanges of the two, and tighten the pre-installed screws.

[0045] S4. Hoist the gearbox generator system, making the central shaft of the gearbox generator system horizontal, and install it with the nacelle elbow and the split main shaft system. Align the corresponding bolt holes, mounting stops and splines on the mounting flanges of the three, tighten the connecting bolts, and complete the assembly of the transmission chain.

[0046] Example 2:

[0047] like Figures 9 to 12 As shown, this embodiment provides a transmission chain structure. The difference between this embodiment and embodiment 1 is that the connecting component is an integrally formed structure, including a conical cylindrical section 1014 and a cylindrical section 1015 connected to each other. The large end of the conical cylindrical section 1014 is connected to the fan hub 3, and its small end is connected to the cylindrical section 1015. The inner and outer surfaces of the connection between the small end and the cylindrical section 1015 are flush.

[0048] The main bearing system 7 includes a bearing housing 702 and a bearing assembly disposed inside the bearing housing 702. The bearing assembly is a single double-row tapered roller bearing 701. The bearing housing is rotatably connected to the connecting member via the double-row tapered roller bearing 701, and the bearing housing 702 is fixedly connected to the engine room elbow 4. The outer circumferential surface of the cylindrical section 1015 is provided with a bearing mounting position 1016 for mounting the double-row tapered roller bearing 201. To facilitate the hoisting of the split main shaft system 1, a lifting lug 1017 is provided at the large end edge of the tapered cylindrical section 1014 for easy hoisting.

[0049] Example 3:

[0050] This embodiment provides a transmission chain structure. The difference between this embodiment and embodiment 2 is that this embodiment uses a three-row cylindrical roller bearing instead of a double-row tapered roller bearing, and the outer circumferential surface of the cylindrical section is provided with a bearing mounting position for installing the three-row cylindrical roller bearing.

[0051] Example 5:

[0052] This embodiment provides a wind turbine generator set, including the transmission chain structure described in Embodiment 1.

[0053] 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 transmission chain structure, characterized in that: The system includes a split-type main shaft system, a main bearing system, a wind turbine hub, a nacelle elbow, and a gearbox generator system. The split-type main shaft system includes a connecting member and an input shaft. The front end of the connecting member is connected to the wind turbine hub, and its rear end faces the gearbox generator system. The input shaft is concentrically located at the center of the connecting member, with its front end connected to the front end of the connecting member and its rear end extending through the connecting member and connecting to the front input shaft of the gearbox generator system. The split-type main shaft system diverts the torque and bending moment loads transmitted from the wind turbine hub, and the torque load is transmitted to the gearbox generator system through the input shaft. The main bearing system is located outside the connecting member and is rotatably connected to it. The nacelle elbow is located outside the gearbox generator system, with its front end connected to the main bearing system. The bending moment load is transmitted to the nacelle elbow through the connecting member and the main bearing system.

2. The transmission chain structure according to claim 1, characterized in that: The main bearing system includes a bearing housing and a bearing assembly disposed inside the bearing housing. The bearing housing is fixedly connected to the nacelle elbow. The bearing assembly is two tapered roller bearings, or a single double-row tapered roller bearing, or a single three-row cylindrical roller bearing.

3. The transmission chain structure according to claim 2, characterized in that: When the bearing assembly consists of two tapered roller bearings, the connecting member is a hollow truncated cone structure, with its large end connected to the wind turbine hub and its small end facing the gearbox generator system. Bearing mounting positions are provided on the outer circumferential surfaces of its front and rear ends, and the two tapered roller bearings are respectively mounted on the two bearing mounting positions.

4. The transmission chain structure according to claim 2, characterized in that: When the bearing assembly is a single double-row tapered roller bearing or a single three-row cylindrical roller bearing, the connecting member includes a tapered cylindrical section and a cylindrical section connected together. The large end of the tapered cylindrical section is connected to the fan hub, and its small end is connected to the cylindrical section. The inner and outer surfaces of the connection between the small end and the cylindrical section are flush. The outer circumferential surface of the cylindrical section is provided with a bearing mounting position for installing the double-row tapered roller bearing or the three-row cylindrical roller bearing.

5. The transmission chain structure according to claim 4, characterized in that: The connecting component is a one-piece molded structure.

6. The transmission chain structure according to claim 1, characterized in that: The input shaft is cylindrical, with its front end flush with the front end of the connecting member and connected by bolts, and its rear end connected to the front input shaft by a spline structure or coupling.

7. The transmission chain structure according to claim 1, characterized in that: A stop structure is provided between the connecting member and the input shaft to facilitate their mutual cooperation.

8. The transmission chain structure according to claim 1, characterized in that: The rear of the nacelle bend is equipped with a sloping open structure to facilitate the maintenance of the gearbox generator system.

9. The transmission chain structure according to claim 1, characterized in that: The gearbox generator system includes a gearbox and a generator. The generator is connected to the rear output shaft of the gearbox, and the outer casing of the gearbox is bolted to the nacelle elbow.

10. A wind turbine generator set, characterized in that, Includes the transmission chain structure as described in any one of claims 1 to 9.

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