Wind turbine generator system

Abstract

The application discloses a wind turbine transmission system, comprising: a main shaft, a speed increasing gearbox, a high-speed coupling and a generator; the front end of the main shaft is connected with an impeller, and the tail part is connected with the front end of the speed increasing gearbox through a tension sleeve, for transmitting the rotation of the impeller to the speed increasing gearbox; the tail part of the speed increasing gearbox is connected with the generator through the high-speed coupling, for transmitting the rotation of the impeller to the generator after the rotation speed is increased; at least two groups of torsion arms are arranged on the speed increasing gearbox, and the at least two groups of torsion arms are arranged at the front part and the tail part of the speed increasing gearbox respectively. Two groups of torsion arms are arranged on the speed increasing gearbox, the torque borne by each group of torsion arms is effectively reduced, the span of the torsion arms is reduced, the width size of the cabin is reduced, and the design of the yaw system is optimized. The two groups of torsion arms are arranged at the front part and the tail part of the speed increasing gearbox respectively, the rigidity of the speed increasing gearbox is enhanced, the deflection of the high-speed stage of the gearbox is reduced, and the service life of the speed increasing gearbox and the high-speed coupling is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation technology, and in particular to a wind turbine generator system. BACKGROUND

[0002] Wind energy is the most representative of renewable energy, which is of great significance to protect the environment and maintain ecological balance, reduce dependence on conventional energy and improve energy structure. The working principle of wind turbine generator is that the blade converts wind energy into kinetic energy, which is transmitted to the generator through the transmission system, and the generator generates electric energy input to the power grid. The reliability of the transmission system is particularly important.

[0003] In the prior art, a set of torsion arms is generally provided on the gear box of the wind turbine generator, which bears the torque of the gear box. When bearing the torque of high-power long-blade wind turbine generator, the size of the torsion arm needs to be continuously increased and strengthened, which will increase the size of the main frame and the cabin, affect the whole machine transportation, and strictly limit the design of the yaw system. The length of the gear box increases with the increase of power, and since a set of torsion arms is generally located at the front of the gear box, the downward deflection of the high-speed stage at the tail of the gear train will increase with the increase of the length of the gear box, which will affect the service life of the gear box. SUMMARY

[0004] To solve the above-mentioned technical problems in the prior art, the present application provides a wind turbine generator transmission system. The technical solution is as follows:

[0005] A wind turbine generator transmission system is provided, comprising: a main shaft, a speed-increasing gear box, a high-speed coupling and a generator; the front end of the main shaft is connected with an impeller, and the tail is connected with the front end of the speed-increasing gear box through a tension sleeve, for transmitting the rotation of the impeller to the speed-increasing gear box; the tail of the speed-increasing gear box is connected with the generator through the high-speed coupling, for transmitting the increased rotation speed of the impeller to the generator; at least two sets of torsion arms are provided on the speed-increasing gear box, and the at least two sets of torsion arms are respectively arranged at the front and tail of the speed-increasing gear box.

[0006] In some optional implementations, each set of the torsion arms comprises two torsion arms arranged on both sides of the speed-increasing gear box respectively.

[0007] In some optional implementations, a first elastic support is arranged at the position where each torsion arm is connected with the frame, and the first elastic support is connected with the frame through bolts, for bearing the weight and torque of the speed-increasing gear box.

[0008] In some optional implementation manners, the tail of the first elastic support is provided with an axial hydraulic elastic support, and two axial hydraulic elastic supports located on the same side of the speed increasing gearbox are connected through a hydraulic pipe to prevent axial movement of the speed increasing gearbox.

[0009] In some optional implementation manners, a second elastic support is arranged between the generator and the frame.

[0010] In some optional implementation manners, a bearing seat is arranged on the main shaft, and a main bearing is arranged between the main shaft and the bearing seat, and bearing seat accessories are arranged on both sides of the main bearing to fix the main bearing and perform lubrication and dust prevention.

[0011] In some optional implementation manners, the main bearing is a double-row self-aligning roller bearing.

[0012] In some optional implementation manners, the tail of the bearing seat accessory is provided with a locking nut for limiting the axial movement of the main bearing.

[0013] In some optional implementation manners, the high-speed coupling is provided with a torque limiter for causing the high-speed coupling to slip when the torque exceeds a set value.

[0014] In some optional implementation manners, the tail of the speed increasing gearbox is provided with a high-speed shaft brake, and the high-speed shaft brake acts on a brake disc of the high-speed coupling to brake the high-speed coupling.

[0015] The main advantages of the technical scheme of the present application are as follows:

[0016] The wind turbine transmission system of the present application is provided with two groups of torsion arms on the speed increasing gearbox, which effectively reduces the torque borne by each group of torsion arms, reduces the span of the torsion arms, and further reduces the width size of the nacelle and optimizes the design of the yaw system. The two groups of torsion arms are arranged at the front and rear of the speed increasing gearbox, which can enhance the rigidity of the speed increasing gearbox, reduce the deflection of the high-speed stage of the gearbox, and prolong the service life of the speed increasing gearbox and the high-speed coupling. The present application is especially suitable for high-power long-blade wind turbines. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present application and constitute a part of the present application, illustrate embodiments of the present application and serve to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0018] Figure 1 The front view of the wind turbine transmission system provided by an embodiment of the present application is shown in the figure.

[0019] Figure 2This is a top view of a wind turbine transmission system provided in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Main shaft, 2-Bearing housing, 3-Main bearing, 4-Bearing housing accessory, 5-Locking nut, 6-Speed ​​gearbox, 7-High-speed coupling, 8-Generator, 9-First elastic support, 10-Second elastic support, 11-High-speed shaft brake, 12-Axial hydraulic elastic support, 13-Torque arm. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] This invention provides a wind turbine transmission system, as shown in the attached figure. Figure 1 and 2 As shown, it includes: a main shaft 1, a speed-increasing gearbox 6, a high-speed coupling 7, and a generator 8; the front end of the main shaft 1 is connected to the impeller, and the rear end is connected to the front end of the speed-increasing gearbox 6 through a tensioning sleeve, for transmitting the rotation of the impeller to the speed-increasing gearbox 6; the rear end of the speed-increasing gearbox 6 is connected to the generator 8 through the high-speed coupling 7, for increasing the speed of the impeller and transmitting it to the generator 8; the speed-increasing gearbox 6 is provided with at least two sets of torque arms 13, which are respectively located at the front and rear of the speed-increasing gearbox 6.

[0025] The working principle of the wind turbine transmission system provided in the embodiments of the present invention will be explained below:

[0026] In operation, the impeller rotates under wind power, driving the main shaft 1 to rotate. The tail end of the main shaft 1 is connected to the speed-increasing gearbox 6. After the speed of the main shaft 1 is accelerated by the speed-increasing gearbox 6, the speed is transmitted to the generator 8 through the high-speed coupling 7, completing wind power generation. The speed-increasing gearbox 6 is equipped with two sets of torque arms 13, effectively reducing the torque borne by each set of torque arms 13, narrowing the span of the torque arms 13, thereby reducing the width of the nacelle and optimizing the yaw system design. Furthermore, the two sets of torque arms 13 are respectively located at the front and rear of the speed-increasing gearbox 6, which can enhance the rigidity of the speed-increasing gearbox 6, reduce the deflection of the high-speed stage of the gearbox, and improve the service life of the speed-increasing gearbox 6 and the high-speed coupling 7. This is particularly suitable for high-power, long-blade wind turbine units.

[0027] As shown in the accompanying drawings, each group of torsion arms 13 includes two torsion arms 13 arranged on both sides of the speed-increasing gearbox 6 respectively. The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, and the force is evenly distributed, thereby improving the rigidity. Figure 1 As shown in the accompanying drawings, each group of torsion arms 13 includes two torsion arms 13 arranged on both sides of the speed-increasing gearbox 6 respectively. The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, and the force is evenly distributed, thereby improving the rigidity. 2 As shown in the accompanying drawings, each group of torsion arms 13 includes two torsion arms 13 arranged on both sides of the speed-increasing gearbox 6 respectively. The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, and the force is evenly distributed, thereby improving the rigidity.

[0028] Optionally, the part where each torsion arm 13 is connected to the rack is provided with a first elastic support 9, which is connected to the rack by bolts and used to bear the weight and torque of the speed-increasing gearbox 6. The speed-increasing gearbox 6 is installed on the main rack. The first elastic support 9 bears the weight and torque of the gearbox and transmits the torque to the main rack. Moreover, the first elastic support 9 can play a buffering role to avoid the speed-increasing gearbox 6 from being subjected to strong impact.

[0029] As shown in the accompanying drawings, each group of torsion arms 13 includes two torsion arms 13 arranged on both sides of the speed-increasing gearbox 6 respectively. The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, and the force is evenly distributed, thereby improving the rigidity. Figure 1 As shown in the accompanying drawings, each group of torsion arms 13 includes two torsion arms 13 arranged on both sides of the speed-increasing gearbox 6 respectively. The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, and the force is evenly distributed, thereby improving the rigidity.

[0030] As shown in the accompanying drawings, each group of torsion arms 13 includes two torsion arms 13 arranged on both sides of the speed-increasing gearbox 6 respectively. The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, and the force is evenly distributed, thereby improving the rigidity. Figure 1 As shown in the accompanying drawings, each group of torsion arms 13 includes two torsion arms 13 arranged on both sides of the speed-increasing gearbox 6 respectively. The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, and the force is evenly distributed, thereby improving the rigidity. 2 As shown in the accompanying drawings, each group of torsion arms 13 includes two torsion arms 13 arranged on both sides of the speed-increasing gearbox 6 respectively. The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, and the force is evenly distributed, thereby improving the rigidity.

[0031] The torque generated by the wind wheel is transmitted to the gearbox, and the gearbox transmits the torque from the impeller to the main rack through the torsion arm elastic support. In this process, the elastic support plays a buffering role.

[0032] As shown in the accompanying drawings, each group of torsion arms 13 includes two torsion arms 13 arranged on both sides of the speed-increasing gearbox 6 respectively. The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, and the force is evenly distributed, thereby improving the rigidity. Figure 2 As shown in the accompanying drawings, each group of torsion arms 13 includes two torsion arms 13 arranged on both sides of the speed-increasing gearbox 6 respectively. The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, and the force is evenly distributed, thereby improving the rigidity.

[0033] The working principle of the axial hydraulic elastic support 12 is as follows: because there is an axial play in the main bearing 3, when the impeller bears the wind load, the transmission chain will produce axial movement, which will affect the speed increasing gearbox 6 and the high speed shaft coupling 7, in order to solve this problem, the axial hydraulic elastic support 12 is arranged on the end surface of the torsion arm 13, the axial hydraulic elastic support 12 has left and right two groups which are connected through hydraulic pipes, after the transmission chain is installed, the inside of each axial hydraulic elastic support 12 is filled with pre-pressure, which can provide certain axial damping for the torsion arm 13, and when the speed increasing gearbox 6 bears a large axial force, the pressure oil in the front axial hydraulic elastic support 12 will be squeezed into the rear axial hydraulic elastic support 12, the rear axial hydraulic elastic support 12 can prevent the speed increasing gearbox 6 from moving at the same time, so as to reduce the axial movement and protect the speed increasing gearbox 6.

[0034] Because the axial force borne by the wind turbine transmission system is basically the axial force from the front end to the tail of the main shaft 1, therefore, the axial hydraulic elastic support 12 only needs to be arranged at the tail of the first elastic support 9. Of course, the person skilled in the art can also arrange the axial hydraulic elastic support 12 at the front end and the tail of the first elastic support 9 respectively to limit in both directions, which is not limited in the embodiment.

[0035] In some optional implementation manners of the embodiment, the second elastic support 10 is arranged between the generator 8 and the rack. The generator 8 can be installed on the rear rack. The second elastic support 10 bears the weight and torque of the generator 8 and transmits the torque to the rear rack, and in the process of transmitting the torque, the second elastic support 10 can provide certain damping to protect the generator 8.

[0036] The first elastic support 9 can be a rubber block or other flexible materials with elasticity, which is not limited in the embodiment.

[0037] In some optional implementation manners of the embodiment, the bearing seat 2 is sleeved on the main shaft 1, the main bearing 3 is arranged between the main shaft 1 and the bearing seat 2, and the bearing seat accessory 4 is arranged at the tail of the main bearing 3, which is used for fixing the main bearing 3 and lubricating and dustproof. The main bearing 3 and the bearing seat 2 are arranged to support and fix the main shaft 1, and facilitate the rotation of the main shaft 1. The bearing seat accessory 4 can limit the axial sliding of the main bearing 3, fix the main bearing 3, store the lubricating oil of the main bearing 3, lubricate the main bearing 3, and prevent external dust and other impurities from entering the main bearing 3.

[0038] In some optional implementation manners of the embodiment, the main bearing 3 is a double-row self-aligning roller bearing. The bearing has large radial load capacity and can bear heavy load and impact load. Moreover, because of the self-aligning performance, the bearing can bear axial load in two directions to a certain extent.

[0039] Optionally, the tail of the bearing seat accessory 4 is provided with a locking nut 5 for limiting the axial movement of the main bearing 3.

[0040] As shown in the accompanying drawings, the bearing seat accessory 4 can be sleeved on the main shaft 1 and block the main bearing 3. The locking nut 5 is sleeved on the main shaft 1 to block and fix the bearing seat accessory 4. Figure 2

[0041] Since the axial force borne by the transmission system of the wind turbine is basically the axial force from the front end to the tail of the main shaft 1, only the locking nut 5 needs to be arranged at the tail of the bearing seat accessory 4. Of course, the person skilled in the art can also arrange the locking nut 5 at the front end and the tail of the main bearing 3 respectively for bidirectional limiting, which is not specifically limited in the embodiment.

[0042] In the embodiment, as shown in the accompanying drawings, the high-speed shaft coupling 7 is connected between the speed-increasing gearbox 6 and the generator 8 to transmit torque, which has the functions of insulation and slipping, avoids the generator 8 from transmitting current to the speed-increasing gearbox 6 to cause electric corrosion of the speed-increasing gearbox 6, and has a torque limiter inside, which slips when the torque reaches the set value to avoid transmitting large torque to the speed-increasing gearbox 6 and causing impact on the speed-increasing gearbox 6 in the working condition of short circuit of the generator 8, thereby protecting the speed-increasing gearbox 6. Figure 1 2 Optionally, as shown in the accompanying drawings, the tail of the speed-increasing gearbox 6 is provided with a high-speed shaft brake 11, which acts on the brake disc of the high-speed shaft coupling 7 to realize the mechanical brake function of the transmission system together with the high-speed shaft coupling, thereby facilitating the maintenance and repair of the transmission chain and the hub inside.

[0043] Needless to say, in the present text, the relational terms such as “first” and “second” are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. In addition, “front”, “back”, “left”, “right”, “up”, “down” in the present text are with reference to the placement state shown in the drawings. Figure 1 2 Needless to say, in the present text, the relational terms such as “first” and “second” are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. In addition, “front”, “back”, “left”, “right”, “up”, “down” in the present text are with reference to the placement state shown in the drawings.

[0044] Needless to say, in the present text, the relational terms such as “first” and “second” are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. In addition, “front”, “back”, “left”, “right”, “up”, “down” in the present text are with reference to the placement state shown in the drawings.

[0045] ​​​Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A wind turbine generator drive train, characterized by, The utility model relates to a kind of main shaft, speed-increasing gearbox, high-speed coupling and generator; The front end of the main shaft is connected with an impeller, and the tail is connected with the front end of the speed-increasing gearbox through a tension sleeve, for transmitting the rotation of the impeller to the speed-increasing gearbox. The tail of the speed-increasing gearbox is connected with the generator through the high-speed coupling, for transmitting the rotation of the impeller to the generator after increasing the speed. At least two groups of torsion arms are provided on the speed-increasing gearbox, and each group of torsion arms is arranged at the front and tail of the speed-increasing gearbox, respectively. Each group of torsion arms includes two torsion arms arranged on both sides of the speed-increasing gearbox, respectively. The part where each torsion arm is connected with the rack is provided with a first elastic support, which is connected with the rack through bolts, for bearing the weight and torque of the speed-increasing gearbox, and for buffering to avoid strong impact on the speed-increasing gearbox. The tail of the first elastic support is provided with an axial hydraulic elastic support, and the two axial hydraulic elastic supports on the same side of the speed-increasing gearbox are connected through hydraulic pipes. Each axial hydraulic elastic support is filled with pre-pressure, which provides axial damping for the torsion arm. When the speed-increasing gearbox bears a large axial force, the pressure oil in the front axial hydraulic elastic support will be squeezed into the rear axial hydraulic elastic support, and the rear axial hydraulic elastic support prevents the axial movement of the speed-increasing gearbox. A second elastic support is provided between the generator and the rack. The high-speed coupling is provided with a torque limiter, for slipping when the torque exceeds the set value. The tail of the speed-increasing gearbox is provided with a high-speed shaft brake, which acts on the brake disc of the high-speed coupling, for braking the high-speed coupling. A bearing seat is provided on the main shaft, and a main bearing is arranged between the main shaft and the bearing seat. Bearing seat accessories are arranged on both sides of the main bearing, for fixing the main bearing and lubricating and dustproofing.

2. A wind turbine generator drive train according to claim 1, wherein, The main bearing is a double-row self-aligning roller bearing.

3. The wind turbine generator system according to claim 2, wherein, The tail of the bearing seat accessory is provided with a locking nut, for limiting the axial movement of the main bearing.

4. The wind turbine generator system according to claim 3, wherein ​

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