A wind turbine generator double-fed gearbox

Abstract

The utility model discloses a kind of wind turbine double-fed gearboxes, including shell, main shaft, primary planetary assembly, secondary planetary assembly, tertiary planetary assembly and fourth planetary assembly, main shaft is connected with the planet carrier of primary planetary assembly, the inner gear ring of secondary planetary assembly is connected with the planet carrier of primary planetary assembly, primary planetary assembly and secondary planetary assembly form series connection, for distributing total torque input by main shaft;The sun gear of primary planetary assembly is connected with the planet carrier of tertiary planetary assembly, the inner gear ring of secondary planetary assembly is connected with the sun gear of tertiary planetary assembly, the planet carrier and inner gear ring of tertiary planetary assembly are sequentially connected with the planet carrier of fourth planetary assembly by the planet wheel and sun gear of tertiary planetary assembly, and torque synthesis output;The utility model carries out optimization design to gear box internal structure, compared with traditional structure, gear box primary assembly part torque reduction is borne, reduce the outer diameter of the gear ring of primary assembly, reduce manufacturing difficulty and reduce cost.

Description

Technical Field

[0001] This utility model relates to the technical field of doubly fed gearboxes, and in particular to a doubly fed gearbox for wind turbine generators. Background Technology

[0002] Wind turbine drive trains currently come in various forms depending on design requirements, such as front-integrated, rear-integrated, and fully integrated types. Some drive trains have limitations on the outer diameter of the gearbox during the early design phase. Gearboxes designed using conventional methods may not meet the requirements for miniaturization, or the current industry's capacity to process the internal gear rings of gearboxes for large-megawatt models is limited. This necessitates a new structural form for the gearbox's outer diameter. Through research, calculation, and benchmarking against mature products, modifying the planetary transmission structure can meet this requirement. For example, the outer diameter of the first-stage internal gear ring in a 24MW gearbox, designed using conventional methods, can be optimized to 4 meters or more.

[0003] For a typical doubly-fed wind turbine gearbox structure, please refer to [link / reference]. Figure 1 As shown, number 1 is the first-stage planetary carrier in the first-stage planetary assembly, number 2 is the first-stage internal gear ring in the first-stage planetary assembly, number 3 is the first-stage sun gear in the first-stage planetary assembly, number 4 is the first-stage planetary assembly, number 5 is the second-stage planetary carrier in the second-stage planetary assembly, and number 6 is the second-stage planetary assembly. The torque transmitted from the hub is input to the gearbox through the first-stage planetary carrier 1 of the first-stage planetary assembly, and then transmitted to the second-stage planetary carrier 5 of the second-stage planetary assembly through the first-stage sun gear 3. Both the first-stage and second-stage planetary assemblies 6 are traditional planetary transmissions, each with only one input component. The torque transmitted from the hub center to the gearbox acts solely on the first-stage planetary assembly. If this structure is used in a large-megawatt unit, the outer diameter of the first-stage internal gear ring will be relatively large, which is not conducive to processing and transportation. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing a doubly fed gearbox for wind turbines. The gearbox is designed with a differential structure, with the first two stages of planetary transmission connected in series. The third stage combines the torques of the series transmissions and outputs them to the next mechanism. The outer diameter of the first-stage internal gear ring is designed to be less than 4 meters, which meets the design requirements of wind turbine transmission chain gearboxes. At the same time, the modified planetary transmission structure can also meet the size restrictions for transportation.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: a doubly fed wind turbine gearbox, comprising a housing, a main shaft, a first-stage planetary assembly, a second-stage planetary assembly, a third-stage planetary assembly, and a fourth-stage planetary assembly. Each of the first-stage, second-stage, third-stage, and fourth-stage planetary assemblies includes a planet carrier, an internal gear ring, planet gears, and a sun gear. The internal gear ring of the first-stage planetary assembly and the planet carrier of the second-stage planetary assembly are fixedly connected to the housing. The main shaft is connected to the planet carrier of the first-stage planetary assembly. The planet carrier of the first-stage planetary assembly is connected to the internal gear ring of the second-stage planetary assembly, and the first-stage planetary assembly and the second-stage planetary assembly form a series connection for distributing the total torque input to the spindle; the sun gear of the first-stage planetary assembly is connected to the planet carrier of the third-stage planetary assembly, the sun gear of the second-stage planetary assembly is connected to the internal gear ring of the third-stage planetary assembly, and the planet carrier and internal gear ring of the third-stage planetary assembly are connected to the planet carrier of the fourth-stage planetary assembly in sequence through the planet gears and sun gear of the third-stage planetary assembly for synthesizing and outputting torque.

[0006] Furthermore, the gearbox includes a high-speed stage assembly; the high-speed stage assembly includes an intermediate shaft, a large gear and a small gear, the sun gear of the four-stage planetary assembly is connected to the intermediate shaft, the intermediate shaft is interference-fitted with the large gear, and the large gear meshes with the small gear.

[0007] Furthermore, the output shaft of the pinion is connected to a generator via a coupling.

[0008] Furthermore, the planet gears of the first-stage planetary assembly are mounted on the planet carrier of the first-stage planetary assembly, and the planet gears of the first-stage planetary assembly mesh with the sun gear of the first-stage planetary assembly.

[0009] Furthermore, the internal gear ring of the second-stage planetary assembly meshes with the planet gears of the second-stage planetary assembly, and the planet gears of the second-stage planetary assembly mesh with the sun gear of the second-stage planetary assembly.

[0010] Furthermore, the internal gear ring of the third-stage planetary assembly meshes with the planet gears of the third-stage planetary assembly, the planet gears of the third-stage planetary assembly are mounted on the planet carrier of the third-stage planetary assembly, the planet gears of the third-stage planetary assembly mesh with the sun gear of the third-stage planetary assembly, and the sun gear of the third-stage planetary assembly is connected to the planet carrier of the fourth-stage planetary assembly.

[0011] Furthermore, the internal gear ring of the fourth-stage planetary assembly is connected to the housing, the planet gears of the fourth-stage planetary assembly are mounted on the planet carrier of the fourth-stage planetary assembly, and the planet gears of the fourth-stage planetary assembly mesh with the sun gear of the fourth-stage planetary assembly.

[0012] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0013] 1. This utility model optimizes the internal structure of the gearbox. Compared with the traditional structure, the torque borne by the first-stage assembly of the gearbox is reduced, thereby reducing the outer diameter of the gear ring of the first-stage planetary assembly. The outer diameter of the first-stage internal gear ring is designed to be less than 4 meters, providing a reference for gearbox designers.

[0014] 2. This utility model reduces the outer diameter of the gearbox by shortening the outer diameter of the first-stage internal gear ring. The gearbox achieves power splitting through a differential structure by changing the structural form of the first three stages of transmission, saving radial space in the gearbox and reducing the difficulty of gearbox processing and manufacturing as well as transportation and manufacturing costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a doubly fed wind turbine gearbox in the prior art.

[0016] Figure 2 This is one of the structural schematic diagrams of this utility model.

[0017] Figure 3 This is the second structural schematic diagram of the present invention. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments.

[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] Example 1

[0021] See Figure 2 As shown, this is a doubly fed wind turbine gearbox provided in this embodiment, used in a 15MW wind turbine. The gearbox includes a housing, a main shaft, a first-stage planetary assembly, a second-stage planetary assembly, a third-stage planetary assembly, a fourth-stage planetary assembly 012, and a high-speed stage assembly 013. The first-stage planetary assembly, the second-stage planetary assembly, the third-stage planetary assembly, and the fourth-stage planetary assembly 012 all include a planet carrier, an internal gear ring, planet gears, and a sun gear.

[0022] The internal gear ring 02 of the first-stage planetary assembly, the planet carrier 016 of the second-stage planetary assembly, and the internal gear ring 018 of the fourth-stage planetary assembly are all fixedly connected to the housing; the main shaft is connected to the planet carrier 01 of the first-stage planetary assembly, and the hub torque is input through the planet carrier 01 of the first-stage planetary assembly; the planet carrier 01 of the first-stage planetary assembly is connected to the internal gear ring 04 of the second-stage planetary assembly, and the planet gears 014 of the first-stage planetary assembly are mounted on the planet carrier 01 of the first-stage planetary assembly. 4 meshes with the sun gear 03 of the first-stage planetary assembly; the internal gear ring 04 of the second-stage planetary assembly meshes with the planet gear 015 of the second-stage planetary assembly; the planet gear 015 of the second-stage planetary assembly is mounted on the planet carrier 016 of the second-stage planetary assembly; the planet gear 015 of the second-stage planetary assembly meshes with the sun gear 05 of the second-stage planetary assembly; the first-stage planetary assembly and the second-stage planetary assembly are connected in series to distribute the total torque input to the spindle; the two distribute the total torque in a preset ratio, which is related to the number of teeth.

[0023] The sun gear 03 of the first-stage planetary assembly is connected to the planet carrier 010 of the third-stage planetary assembly. The sun gear 05 of the second-stage planetary assembly is connected to the internal gear ring 07 of the third-stage planetary assembly via the connecting housing 06. The internal gear ring 07 of the third-stage planetary assembly meshes with the planet gears 08 of the third-stage planetary assembly. The planet gears 08 of the third-stage planetary assembly are mounted on the planet carrier 010 of the third-stage planetary assembly. The planet gears 08 of the third-stage planetary assembly mesh with the sun gear 09 of the third-stage planetary assembly. The sun gear 09 of the third-stage planetary assembly is connected to the planet carrier 011 of the fourth-stage planetary assembly 012. This is used to synthesize the torque input from the first-stage and second-stage planetary assemblies for output. Since the total torque of the hub acts simultaneously on both the first-stage and second-stage planetary assemblies, the third-stage planetary assembly has two input components. Compared with the traditional structure, the torque value borne by the first-stage planetary assembly is reduced. The reduction in torque is beneficial to reducing the outer diameter value of the first-stage planetary assembly.

[0024] The planet gears of the fourth-stage planetary assembly 012 are mounted on the planet carrier 011 of the fourth-stage planetary assembly 012. The planet gears 017 of the fourth-stage planetary assembly 012 mesh with the sun gear 019 of the fourth-stage planetary assembly. The sun gear 019 of the fourth-stage planetary assembly is connected to the high-speed stage assembly 013.

[0025] Example 2

[0026] See Figure 3 As shown, unlike Embodiment 1, the doubly fed gearbox for wind turbines provided in this embodiment specifically discloses the structure of the high-speed stage assembly.

[0027] The sun gear a of the third-stage planetary assembly is connected to the planet carrier b of the fourth-stage planetary assembly. The planet gears of the fourth-stage planetary assembly are mounted on the planet carrier b of the fourth-stage planetary assembly, and the planet gears of the fourth-stage planetary assembly mesh with the sun gear c of the fourth-stage planetary assembly. The high-speed stage assembly includes an intermediate shaft d, a large gear e, and a small gear f. The sun gear c of the fourth-stage planetary assembly is connected to the intermediate shaft d. The intermediate shaft d is interference-fitted with the large gear e, and the large gear e meshes with the small gear f.

[0028] External force is input from the planet carrier of the first-stage planetary assembly. The spindle is bolted to the planet carrier of the first-stage planetary assembly. Simultaneously, the planet carrier of the first-stage planetary assembly is connected to the internal gear ring in the second-stage planetary assembly. The internal gear ring of the first-stage planetary assembly is bolted to the housing. The first-stage planetary assembly is connected to the planet carrier of the third-stage planetary assembly via splines in its sun gear. The second-stage planetary assembly is connected to the internal gear ring in the third-stage planetary assembly via splines in its sun gear and a connecting housing. The planet carrier of the second-stage planetary assembly... The three-stage planetary assembly is fixed to the housing by bolts. It adopts a differential structure. The internal gear ring and planet carrier of the three-stage planetary assembly are two driving components. The three-stage planetary assembly is connected to the planet carrier of the four-stage planetary assembly through the sun gear of the three-stage planetary assembly. The subsequent transmission route is similar to the traditional structure. The sun gear of the four-stage planetary assembly is the driven component and is connected to the intermediate shaft in the parallel gear train through its sun gear spline. The intermediate shaft and the large gear in the parallel gear train are tightly bound together by an interference fit. The large gear and the small gear in the parallel gear train are paired gears.

[0029] The transmission route of this doubly fed gearbox is as follows: The gearbox structure adopts a compact structure with a four-stage planetary gear transmission plus a parallel shaft hybrid transmission; the low-speed stage has low speed and high torque, and adopts a planetary structure with nine planetary gears, mainly using the floating sun gear for load distribution. The wind first acts on the blades, causing them to rotate. The rotating wind turbine inputs kinetic energy through the planet carrier of the first-stage planetary assembly. The rotation of the planet carrier of the first-stage planetary assembly drives the planetary gears of the first-stage planetary assembly above it to rotate. The planetary gears of the first-stage planetary assembly will revolve around the planet carrier of the first-stage planetary assembly and also rotate around their own axis. The rotation of the planet gears in the first-stage planetary assembly drives the rotation of the sun gear in the first-stage planetary assembly. Simultaneously, the rotation of the planet carrier in the first-stage planetary assembly drives the rotation of the internal ring gear in the second-stage planetary assembly. The rotation of the internal ring gear in the second-stage planetary assembly drives the rotation of the planet gears in the second-stage planetary assembly. The rotation of the planet gears in the second-stage planetary assembly drives the rotation of the sun gear in the second-stage planetary assembly. The sun gear in the second-stage planetary assembly then drives the rotation of the internal ring gear in the third-stage planetary assembly. The splines on the sun gear in the first-stage planetary assembly drive the rotation of the planet carrier in the third-stage planetary assembly. Part of the input from the first two stages drives the sun gear of the third-stage planetary assembly to rotate. The output shaft of the sun gear of the third-stage planetary assembly outputs the torque to the fourth-stage planetary assembly. The sun gear of the fourth-stage planetary assembly transmits the torque through the spline at the other end to the large gear via the intermediate shaft. The large gear then transmits the torque to the small gear output shaft through gear transmission. The output shaft converts the high-torque, low-speed kinetic energy input into low-torque, high-speed kinetic energy, which is then transmitted to the generator through the coupling. Finally, the generator converts the input kinetic energy into electrical energy and supplies it to the power grid.

[0030] The above-described embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all changes made in accordance with the shape and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A doubly-fed wind turbine gearbox, comprising a housing, a main shaft, a first-stage planetary assembly, a second-stage planetary assembly, a third-stage planetary assembly, and a fourth-stage planetary assembly, wherein each of the first-stage, second-stage, third-stage, and fourth-stage planetary assemblies includes a planet carrier, an internal gear ring, planet gears, and a sun gear, characterized in that: The internal gear ring of the first-stage planetary assembly and the planet carrier of the second-stage planetary assembly are both fixedly connected to the housing. The spindle is connected to the planet carrier of the first-stage planetary assembly, and the planet carrier of the first-stage planetary assembly is connected to the internal gear ring of the second-stage planetary assembly. The first-stage and second-stage planetary assemblies form a series connection for distributing the total torque input to the spindle. The sun gear of the first-stage planetary assembly is connected to the planet carrier of the third-stage planetary assembly, and the sun gear of the second-stage planetary assembly is connected to the internal gear ring of the third-stage planetary assembly. The planet carrier and internal gear ring of the third-stage planetary assembly are connected to the planet carrier of the fourth-stage planetary assembly in sequence through the planet gears and sun gear of the third-stage planetary assembly for synthesizing and outputting torque.

2. A doubly-fed gearbox for a wind turbine generator according to claim 1, characterized in that: It includes a high-speed stage assembly; the high-speed stage assembly includes an intermediate shaft, a large gear and a small gear, the sun gear of the four-stage planetary assembly is connected to the intermediate shaft, the intermediate shaft is interference-fitted with the large gear, and the large gear meshes with the small gear.

3. A doubly-fed gearbox for a wind turbine generator according to claim 2, characterized in that: The output shaft of the pinion is connected to a generator via a coupling.

4. A doubly-fed gearbox for a wind turbine generator according to claim 1, characterized in that: The planet gears of the first-stage planetary assembly are mounted on the planet carrier of the first-stage planetary assembly, and the planet gears of the first-stage planetary assembly mesh with the sun gear of the first-stage planetary assembly.

5. A doubly-fed gearbox for a wind turbine generator according to claim 1, characterized in that: The internal gear ring of the second-stage planetary assembly meshes with the planet gears of the second-stage planetary assembly, and the planet gears of the second-stage planetary assembly mesh with the sun gear of the second-stage planetary assembly.

6. A doubly-fed gearbox for a wind turbine generator according to claim 1, characterized in that: The internal gear ring of the third-stage planetary assembly meshes with the planet gears of the third-stage planetary assembly. The planet gears of the third-stage planetary assembly are mounted on the planet carrier of the third-stage planetary assembly. The planet gears of the third-stage planetary assembly mesh with the sun gear of the third-stage planetary assembly. The sun gear of the third-stage planetary assembly is connected to the planet carrier of the fourth-stage planetary assembly.

7. A doubly-fed gearbox for wind turbines according to claim 1, characterized in that: The internal gear ring of the fourth-stage planetary assembly is connected to the housing, the planet gears of the fourth-stage planetary assembly are mounted on the planet carrier of the fourth-stage planetary assembly, and the planet gears of the fourth-stage planetary assembly mesh with the sun gear of the fourth-stage planetary assembly.

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