Gearbox for a wind turbine generator

Abstract

The utility model discloses a gear box of wind generating set relates to wind power generation technical field, wherein, the gear box of wind generating set includes box, input shaft, transmission subassembly and output shaft, and input shaft rotatablely is arranged in the box, and the one end of input shaft is inserted into the box and is provided with first magnetic force coupling unit, and transmission subassembly is arranged in the box, and transmission subassembly includes input piece and output piece, and input piece is coaxially arranged with input shaft, and input piece is provided with the second magnetic force coupling unit corresponding with first magnetic force coupling unit, and the air gap is arranged between second magnetic force coupling unit and first magnetic force coupling unit, output shaft rotatablely is arranged in the box, and output shaft is coaxially arranged with output piece, and the one end of output shaft is inserted into the box and is connected with output piece, the utility model provides technical scheme can solve the technical problem that the gear box of wind generating set is easily damaged because of impact load.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, and in particular to a gearbox for a wind turbine generator set. Background Technology

[0002] A wind turbine is a device that converts wind energy into electrical energy and is an important component of renewable energy technology. It captures wind energy through blades to drive a rotor, which then accelerates the rotation via a transmission system before being used by a generator to produce electricity. The gearbox, as the core component of a wind turbine, converts the low speed of the rotor into the high speed required by the generator for efficient power generation. However, the gearbox of a wind turbine is highly susceptible to damage from impact loads during use.

[0003] Therefore, it is necessary to provide a new gearbox for wind turbine generators to solve the above-mentioned technical problems. Utility Model Content

[0004] The main purpose of this utility model is to provide a gearbox for wind turbine generator sets, which aims to solve the technical problem that gearboxes of wind turbine generator sets are easily damaged by impact loads.

[0005] To achieve the above objectives, this utility model proposes a gearbox for a wind turbine generator set, comprising: Box; An input shaft is rotatably mounted on the housing, with one end of the input shaft extending into the housing and equipped with a first magnetic coupling unit; A transmission assembly is disposed within the housing. The transmission assembly includes an input component and an output component. The input component is coaxially disposed with the input shaft. The input component is provided with a second magnetic coupling unit corresponding to the first magnetic coupling unit. An air gap is provided between the second magnetic coupling unit and the first magnetic coupling unit. An output shaft is rotatably mounted on the housing and coaxially mounted with the output component. One end of the output shaft extends into the housing and is connected to the output component.

[0006] In one embodiment, the first magnetic coupling unit includes a plurality of first permanent magnets, which are arranged at equal intervals along the circumferential direction of the input shaft, and the polarities of any two adjacent first permanent magnets near the input component are opposite; the second magnetic coupling unit includes a plurality of second permanent magnets, which are arranged at equal intervals along the circumferential direction of the input component, and the polarities of any two adjacent second permanent magnets near the input shaft are opposite; the number of first permanent magnets and second permanent magnets are equal and they are arranged in a one-to-one correspondence.

[0007] In one embodiment, the transmission assembly includes a first planetary gear transmission unit and a second planetary gear transmission unit, the second planetary gear transmission unit being drively connected to the first planetary gear transmission unit, the first planetary gear transmission unit including the input component, and the second planetary gear transmission unit including the output component.

[0008] In one embodiment, the inner side of the housing is provided with meshing teeth. The first planetary gear transmission unit includes a first sun gear, a first planet carrier, and a plurality of first planet gears. The first sun gear, the first planet carrier, and the input shaft are coaxially arranged. The first planet carrier is rotatably disposed in the housing. The first sun gear is rotatably disposed on the first planet carrier via a rotating shaft. Each of the first planet gears is rotatably disposed on the first planet carrier and meshes between the first sun gear and the meshing teeth. The input component is the first planet carrier.

[0009] In one embodiment, one end of the rotating shaft is fixedly connected to the first sun gear, and the other end is rotatably mounted on the first planet carrier via a first bearing.

[0010] In one embodiment, the number of the first planetary gears is three, and the three first planetary gears are evenly spaced along the circumferential interval of the sun gear.

[0011] In one embodiment, the second planetary gear transmission unit includes a second sun gear, a second planet carrier, and a plurality of second planet gears. The second sun gear, the second planet carrier, and the rotating shaft are coaxially arranged. The second planet carrier is disposed on the rotating shaft. The output component is the second sun gear. The second sun gear is fixedly connected to the output shaft. One end of the output shaft extends into the housing, passes through the second sun gear, and is rotatably disposed on the second planet carrier. Each second planet gear is rotatably disposed on the second planet carrier and meshes between the second sun gear and the meshing teeth.

[0012] In one embodiment, one end of the output shaft extending into the housing is rotatably mounted on the second planetary carrier via a second bearing.

[0013] In one embodiment, the number of the second planetary gears is three, and the three second planetary gears are evenly spaced along the circumferential interval of the second sun gear.

[0014] In one embodiment, the second planetary carrier is integrally formed with the rotating shaft.

[0015] This invention employs magnetic coupling to establish a non-contact torque transmission path, effectively isolating and attenuating impact loads from the impeller assembly, thereby significantly reducing the risk of gearbox damage in wind turbine generators. In this embodiment, the input shaft is fixedly connected to the main shaft of the impeller assembly. A first magnetic coupling unit is provided at the end of the input shaft extending into the gearbox, and a second magnetic coupling unit is provided at the input component of the transmission assembly. When the main shaft drives the input shaft to rotate, the torque of the input shaft can be transmitted to the transmission assembly through the magnetic coupling between the first and second magnetic coupling units, realizing the power input to the gearbox. When the input shaft experiences sudden speed changes or vibrations due to the impact load of the impeller assembly, the flexible connection characteristics of the first and second magnetic coupling units prevent the impact load of the impeller assembly from being directly transmitted to the transmission assembly inside the gearbox. This better protects the gearbox and reduces the risk of gearbox damage. Furthermore, the use of magnetic coupling for transmission not only reduces the impact load on the gearbox but also reduces the peak load in the transmission chain, thereby extending the service life of the gearbox and improving the operational reliability of the wind turbine generator set. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the gearbox of a wind turbine generator set in one embodiment of the present invention; Figure 2 for Figure 1 Cross-sectional view; Figure 3 A schematic diagram of the transmission component in one embodiment of this utility model.

[0018] Explanation of icon numbers: 100, Housing; 110, Meshing teeth; 200, Input shaft; 210, First magnetic coupling unit; 211, First permanent magnet; 300, Transmission assembly; 310, First planetary gear transmission unit; 311, First sun gear; 311a, Rotating shaft; 312, First planet carrier; 313, First planet gear; 320, Second planetary gear transmission unit; 321, Second sun gear; 322, Second planet carrier; 323, Second planet gear; 330, Input component; 331, Second magnetic coupling unit; 331a, Second permanent magnet; 340, Output component; 400, Output shaft.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

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

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model 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, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0023] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] A wind turbine is a device that converts wind energy into electrical energy and is an important component of renewable energy technology. It captures wind energy through blades to drive a rotor, which then accelerates the rotation via a transmission system before being used by a generator to produce electricity. The gearbox, as the core component of the wind turbine, converts the low speed of the impeller into the high speed required by the generator for efficient power generation. In actual production and research, researchers have discovered that the input shaft of the gearbox is rigidly connected to the main shaft of the wind turbine's impeller assembly. All impact loads from turbulent wind conditions (such as gusts, shear forces, and sudden stop torque) borne by the impeller are directly transmitted to the gearbox without any buffering. Prolonged exposure to these impact loads can damage the internal structure of the gearbox.

[0025] This utility model proposes a gearbox for wind turbine generator sets, aiming to solve the technical problem that gearboxes of wind turbine generator sets are easily damaged by impact loads.

[0026] Please see Figures 1 to 3 In one embodiment of this utility model, the gearbox of a wind turbine generator set includes a housing 100, an input shaft 200, a transmission assembly 300, and an output shaft 400. The input shaft 200 is rotatably mounted on the housing 100, with one end extending into the housing 100 and having a first magnetic coupling unit 210. The transmission assembly 300 is disposed inside the housing 100 and includes an input component 330 and an output component 340. The input component 330 is coaxially mounted with the input shaft 200 and has a second magnetic coupling unit 331 corresponding to the first magnetic coupling unit 210. An air gap is provided between the second magnetic coupling unit 331 and the first magnetic coupling unit 210. The output shaft 400 is rotatably mounted on the housing 100 and coaxially mounted with the output component 340. One end of the output shaft 400 extends into the housing 100 and is connected to the output component 340. The air gap is a physical gap intentionally left between two magnetic coupling units to prevent them from directly contacting each other.

[0027] The technical solution of this utility model establishes a non-contact torque transmission path by using magnetic coupling, which can effectively isolate and attenuate the impact load from the impeller assembly, thereby significantly reducing the risk of damage to the gearbox of the wind turbine generator set. In this embodiment, the input shaft 200 is used to be fixedly connected to the main shaft of the impeller assembly, and the output shaft 400 is used to connect to the generator of the wind turbine generator set. A first magnetic coupling unit 210 is provided at one end of the input shaft 200 that extends into the housing 100, and a second magnetic coupling unit 331 is provided at the input component 330 of the transmission assembly 300. When the main shaft drives the input shaft 200 to rotate, the torque of the input shaft 200 can be transmitted to the transmission assembly 300 through the magnetic coupling between the first magnetic coupling unit 210 and the second magnetic coupling unit 331, thereby realizing the power input of the gearbox. When the input shaft 200 experiences sudden speed changes or vibrations due to the impact load from the impeller assembly, the flexible connection between the first magnetic coupling unit 210 and the second magnetic coupling unit 331 prevents the impact load from being directly transmitted to the transmission component 300 inside the gearbox. This better protects the gearbox and reduces the risk of damage. Furthermore, using magnetic coupling for transmission not only reduces the impact load on the gearbox but also reduces the peak load in the transmission chain, extending the gearbox's service life and improving the operational reliability of the wind turbine generator. This wind turbine generator gearbox is applied in the field of wind power generation technology.

[0028] It should be noted that in this embodiment, by directly integrating the first magnetic coupling unit 210 and the second magnetic coupling unit 331 for torque transmission into the gearbox, when assembling the wind turbine generator set, it is only necessary to rigidly connect the input shaft 200 of the gearbox to the main shaft of the impeller assembly. No additional components need to be installed on the input shaft 200 of the gearbox and the main shaft of the impeller assembly, thus reducing the assembly difficulty of the wind turbine generator set. Furthermore, in actual manufacturing, the main shaft of the impeller assembly can be directly used as the input shaft 200, and the output shaft 400 as the input end of the generator. That is, the input shaft 200 is the main shaft of the impeller assembly, and the output shaft 400 is the input end of the generator. Only the first magnetic coupling unit 210 needs to be installed on the main shaft of the impeller assembly. When assembling the wind turbine generator set, it is only necessary to insert the main shaft of the impeller assembly and the input end of the generator into the gearbox housing 100, further reducing the assembly difficulty of the wind turbine generator set.

[0029] In one embodiment of this invention, the first magnetic coupling unit 210 includes a plurality of first permanent magnets 211, which are arranged evenly and sequentially along the circumferential direction of the input shaft 200. The polarities of any two adjacent first permanent magnets 211 near the input component 330 are opposite. The second magnetic coupling unit 331 includes a plurality of second permanent magnets 331a, which are arranged evenly and sequentially along the circumferential direction of the input component 330. The polarities of any two adjacent second permanent magnets 331a near the input shaft 200 are opposite. The number of first permanent magnets 211 and second permanent magnets 331a are equal and they are arranged in a one-to-one correspondence. In this embodiment, the use of an array of permanent magnets with alternating polarities for magnetic coupling generates a strong and stable circumferential alternating magnetic field, achieving efficient and smooth torque transmission. The one-to-one correspondence between the first permanent magnets 211 and the second permanent magnets 331a ensures effective matching and coupling of the magnetic field, maximizing the transmitted torque density.

[0030] In one embodiment of this utility model, the transmission assembly 300 includes a first planetary gear transmission unit 310 and a second planetary gear transmission unit 320. The second planetary gear transmission unit 320 is driveably connected to the first planetary gear transmission unit 310. The first planetary gear transmission unit 310 includes an input component 330, and the second planetary gear transmission unit 320 includes an output component 340. In this embodiment, a multi-stage planetary gear transmission unit is used for transmission, which on the one hand achieves a high transmission ratio and a compact layout, and on the other hand, can disperse impact loads in multiple stages to reduce the risk of gearbox damage.

[0031] In one embodiment of this utility model, the inner side of the housing 100 is provided with meshing teeth 110. The first planetary gear transmission unit 310 includes a first sun gear 311, a first planet carrier 312, and multiple first planet gears 313. The first sun gear 311, the first planet carrier 312, and the input shaft 200 are coaxially arranged. The first planet carrier 312 is rotatably disposed within the housing 100. The first sun gear 311 is rotatably disposed on the first planet carrier 312 via a rotating shaft 311a. Each first planet gear 313 is rotatably disposed on the first planet carrier 312 and meshes between the first sun gear 311 and the meshing teeth 110. The input component 330 is the first planet carrier 312. In a specific embodiment, the number of first planet gears 313 is three, and the three first planet gears 313 are evenly spaced along the circumference of the sun gear. The first planet carrier 312 is rotatably disposed within the housing 100 via bearings.

[0032] In one embodiment of this utility model, one end of the rotating shaft 311a is fixedly connected to the first sun gear 311, and the other end is rotatably mounted on the first planetary carrier 312 via a first bearing. In this embodiment, the rotating shaft 311a is rotatably mounted on the first planetary carrier 312 via the first bearing, which can ensure the stability of the rotating shaft 311a when rotating, thereby ensuring the stability of the first sun gear 311 when rotating.

[0033] In one embodiment of this utility model, the second planetary gear transmission unit 320 includes a second sun gear 321, a second planet carrier 322, and a plurality of second planet gears 323. The second sun gear 321, the second planet carrier 322, and the rotating shaft 311a are coaxially arranged. The second planet carrier 322 is disposed on the rotating shaft 311a. The output component 340 is the second sun gear 321, which is fixedly connected to the output shaft 400. One end of the output shaft 400 extending into the housing 100 passes through the second sun gear 321 and is rotatably disposed on the second planet carrier 322. Each second planet gear 323 is rotatably disposed on the second planet carrier 322 and meshes between the second sun gear 321 and the meshing teeth 110. In a specific embodiment, the number of second planet gears 323 is three, and the three second planet gears 323 are evenly spaced along the circumference of the second sun gear 321.

[0034] In one embodiment of this utility model, one end of the output shaft 400 extending into the housing 100 is rotatably mounted on the second planetary carrier 322 via a second bearing. In this embodiment, the rotatable mounting of the output shaft 400 on the second planetary carrier 322 via the second bearing ensures the stability of the output shaft 400 during rotation, thereby ensuring the stability of the second sun gear 321 during rotation. Furthermore, in this embodiment, the first planetary carrier 312, the first sun gear 311, the second planetary carrier 322, the second sun gear 321, and the output shaft 400 are all coaxially mounted. The first sun gear 311 is rotatably mounted on the first planetary carrier 312 via a rotating shaft 311a, the second planetary carrier 322 is mounted on the rotating shaft 311a, and the output shaft 400 is mounted on the second planetary carrier 322. This allows the first planetary gear transmission unit 310 and the second planetary gear transmission unit 320 to be supported by the first planetary carrier 312 and the output shaft 400, ensuring the stability of the first planetary gear transmission unit 310 and the second planetary gear transmission unit 320 during transmission. In one specific embodiment, the second planetary carrier 322 and the rotating shaft 311a are integrally formed; this can improve the connection reliability between the second planetary carrier 322 and the rotating shaft 311a, thereby ensuring the operational reliability of the transmission assembly 300.

[0035] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A gearbox for a wind turbine generator set, characterized in that, include: Box; An input shaft is rotatably mounted on the housing, with one end of the input shaft extending into the housing and equipped with a first magnetic coupling unit; A transmission assembly is disposed within the housing. The transmission assembly includes an input component and an output component. The input component is coaxially disposed with the input shaft. The input component is provided with a second magnetic coupling unit corresponding to the first magnetic coupling unit. An air gap is provided between the second magnetic coupling unit and the first magnetic coupling unit. An output shaft is rotatably mounted on the housing and coaxially mounted with the output component. One end of the output shaft extends into the housing and is connected to the output component.

2. The gearbox of the wind turbine generator set as described in claim 1, characterized in that, The first magnetic coupling unit includes a plurality of first permanent magnets, which are arranged at equal intervals along the circumferential direction of the input shaft, and the polarities of any two adjacent first permanent magnets near the input component are opposite. The second magnetic coupling unit includes a plurality of second permanent magnets, which are arranged at equal intervals along the circumferential direction of the input component, and the polarities of any two adjacent second permanent magnets near the input shaft are opposite. The number of first permanent magnets and second permanent magnets are equal and they are arranged in a one-to-one correspondence.

3. The gearbox of the wind turbine generator set as described in claim 1, characterized in that, The transmission assembly includes a first planetary gear transmission unit and a second planetary gear transmission unit. The second planetary gear transmission unit is connected to the first planetary gear transmission unit. The first planetary gear transmission unit includes the input component, and the second planetary gear transmission unit includes the output component.

4. The gearbox of the wind turbine generator set as described in claim 3, characterized in that, The inner side of the housing is provided with meshing teeth. The first planetary gear transmission unit includes a first sun gear, a first planet carrier, and a plurality of first planet gears. The first sun gear, the first planet carrier, and the input shaft are coaxially arranged. The first planet carrier is rotatably arranged in the housing. The first sun gear is rotatably arranged on the first planet carrier through a rotating shaft. Each first planet gear is rotatably arranged on the first planet carrier and meshes between the first sun gear and the meshing teeth. The input component is the first planet carrier.

5. The gearbox of the wind turbine generator set as described in claim 4, characterized in that, One end of the shaft is fixedly connected to the first sun gear, and the other end is rotatably mounted on the first planet carrier via a first bearing.

6. The gearbox of the wind turbine generator set as described in claim 4, characterized in that, The number of the first planetary gears is three, and the three first planetary gears are evenly spaced along the circumferential interval of the sun gear.

7. The gearbox of the wind turbine generator set as described in claim 4, characterized in that, The second planetary gear transmission unit includes a second sun gear, a second planet carrier, and multiple second planet gears. The second sun gear, the second planet carrier, and the rotating shaft are coaxially arranged. The second planet carrier is disposed on the rotating shaft. The output component is the second sun gear. The second sun gear is fixedly connected to the output shaft. One end of the output shaft extends into the housing, passes through the second sun gear, and is rotatably disposed on the second planet carrier. Each second planet gear is rotatably disposed on the second planet carrier and meshes between the second sun gear and the meshing teeth.

8. The gearbox of the wind turbine generator set as described in claim 7, characterized in that, One end of the output shaft, which extends into the housing, is rotatably mounted on the second planetary carrier via a second bearing.

9. The gearbox of the wind turbine generator set as described in claim 7, characterized in that, The number of the second planetary gears is three, and the three second planetary gears are evenly spaced along the circumferential interval of the second sun gear.

10. The gearbox of the wind turbine generator set as described in claim 7, characterized in that, The second planetary carrier is integrally formed with the rotating shaft.

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