CN115263677A - Transmission system of wind turbine generator - Google Patents

Abstract

The invention discloses a wind turbine generator transmission system, which comprises: the system comprises a main shaft, a speed-up gear box, a high-speed coupler and a generator; the front end of the main shaft is connected with the impeller, and the tail part of the main shaft is connected with the front end of the speed-increasing gear box through the tensioning sleeve and used for transmitting the rotation of the impeller to the speed-increasing gear box; the tail part of the speed-up gear box is connected with the generator through a high-speed coupler and is used for transmitting the rotating speed of the impeller to the generator after being increased; the speed-up gear box is provided with at least two groups of torque arms which are respectively arranged at the front part and the tail part of the speed-up gear box. Two groups of torque arms are arranged on the speed-up gear box, so that the torque borne by each group of torque arms is effectively reduced, the span of the torque arms is reduced, the width size of a cabin is further reduced, and the design of a yaw system is optimized. And two groups of torque arms are respectively arranged at the front part and the rear part of the speed-up gear box, so that the rigidity of the speed-up gear box can be enhanced, the high-speed grade downwarping of the gear box is reduced, and the service lives of the speed-up gear box and the high-speed coupler are prolonged.

Description

Wind turbine drive system

technical field

The invention relates to the technical field of wind power generation, in particular to a wind turbine transmission system.

Background technique

Wind energy is the most representative type of renewable energy. It is of great significance to protecting the environment and maintaining ecological balance, as well as reducing dependence on conventional energy and improving energy structure. The working principle of wind turbines is that the blades convert wind energy into kinetic energy, which is transmitted to the generator through the transmission system, and the generator generates electrical energy and inputs it to the grid. Among them, the reliability of the transmission system is particularly important.

In the prior art, a gear box of a wind turbine is generally provided with a set of torque arms, and the torque of the gear box is borne by the torque arms. To withstand the torque of high-power long-blade wind turbines, it is necessary to continuously increase and strengthen the size of the torsion arm. At this time, the dimensions of the main frame and the nacelle will be increased, which will affect the delivery of the whole machine, and at the same time strictly limit the design of the yaw system. The length of the gearbox increases with the increase of the power. Since a set of torque arms is generally located at the front of the gearbox, the deflection of the high-speed stage at the tail of the gear train will increase with the increase of the length of the gearbox, which will affect the life of the gearbox. make an impact.

Contents of the invention

In order to solve some or all of the technical problems in the above-mentioned prior art, the present invention provides a wind turbine transmission system. The technical solution is as follows:

A wind turbine transmission system is provided, including: a main shaft, a speed-up gearbox, a high-speed coupling and a generator; the front end of the main shaft is connected to the impeller, and the tail is connected to the front end of the speed-up gearbox through a tensioning sleeve , used to transmit the rotation of the impeller to the speed-up gearbox; the tail of the speed-up gearbox is connected to the generator through the high-speed coupling, and is used to increase the speed of the impeller and then transmit it to the generator ; The speed-up gearbox is provided with at least two groups of torsion arms, and the at least two groups of torsion arms are respectively arranged at the front and tail of the speed-up gearbox.

In some optional implementation manners, each set of torsion arms includes two torsion arms respectively arranged on two sides of the speed-up gearbox.

In some optional implementation manners, each portion where the torsion arm is connected to the frame is provided with a first elastic support, and the first elastic support is connected to the frame through bolts, and is used to support the speed-up gearbox. weight and torque.

In some optional implementation manners, the tail of the first elastic support is provided with an axial hydraulic elastic support, and the two axial hydraulic elastic supports located on the same side of the speed-increasing gearbox are connected by hydraulic pipes to Axial movement of the speed-increasing gearbox is prevented.

In some optional implementation manners, a second elastic support is provided between the generator and the frame.

In some optional implementations, the main shaft is covered with a bearing seat, the main bearing is arranged between the main shaft and the bearing seat, and bearing seat accessories are provided on both sides of the main bearing for fixing The main bearings are lubricated and dust-proof.

In some optional implementation manners, the main bearing is a double-row spherical roller bearing.

In some optional implementation manners, a lock nut is provided at the tail of the attachment of the bearing seat to limit the position of the main bearing to avoid axial movement.

In some optional implementation manners, the high-speed coupling is provided with a torque limiter, which is used to make the high-speed coupling slip when the torque exceeds a set value.

In some optional implementation manners, a high-speed shaft brake is provided at the rear of the speed-up gearbox, and the high-speed shaft brake acts on the brake disc of the high-speed coupling for braking the high-speed coupling. brake.

The main advantages of the technical solution of the present invention are as follows:

In the wind turbine transmission system of the present invention, two sets of torsion arms are arranged on the speed-increasing gearbox, which effectively reduces the torque borne by each set of torsion arms, reduces the span of the torsion arms, further reduces the width of the nacelle, and optimizes the design of the yaw system. Moreover, two sets of torsion arms are respectively arranged at the front and rear of the speed-up gearbox, which can enhance the rigidity of the speed-up gearbox, reduce the downward deflection of the high-speed stage of the gearbox, and improve the service life of the speed-up gearbox and the high-speed coupling. It is especially suitable for high-power long-bladed wind turbines.

Description of drawings

The drawings described here are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is a front view of a wind turbine transmission system provided by an embodiment of the present invention;

Fig. 2 is a top view of the wind turbine transmission system provided by an embodiment of the present invention.

Explanation of reference signs:

1-main shaft, 2-bearing housing, 3-main bearing, 4-bearing housing accessories, 5-lock nut, 6-increasing 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-torsion arm.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

The technical solutions provided by the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

The embodiment of the present invention provides a wind turbine drive system, as shown in Figures 1 and 2, including: 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 , the tail is connected to the front end of the speed-up gearbox 6 through a tensioner sleeve, which is used to transmit the impeller rotation to the speed-up gearbox 6; the tail of the speed-up gearbox 6 is connected to the generator 8 through a high-speed coupling 7, for The speed of the impeller is increased and transmitted to the generator 8; at least two groups of torque arms 13 are arranged on the speed-up gearbox 6, and at least two groups of torque arms 13 are respectively arranged at the front and tail of the speed-up gearbox 6.

The working principle of the wind turbine transmission system provided by the embodiment of the present invention is described below:

During use, the impeller rotates under the action of wind to drive the main shaft 1 to rotate, and the tail end of the main shaft 1 is connected with the speed-increasing gear box 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 to complete wind power generation. Among them, two sets of torsion arms 13 are arranged on the speed-up gearbox 6, which effectively reduces the torque borne by each set of torsion arms 13, reduces the span of the torsion arms 13, further reduces the width of the nacelle, and optimizes the design of the yaw system. And two groups of torsion arms 13 are respectively arranged on the front and the rear of the speed-up gear box 6, which can enhance the rigidity of the speed-up gear box 6, reduce the downward deflection of the high-speed gear box, and improve the speed-up gear box 6 and the high-speed coupling. 7 service life. It is especially suitable for high-power long-bladed wind turbines.

Wherein, as shown in Figures 1 and 2 , each set of torsion arms 13 includes two torsion arms 13 respectively arranged on both sides of the speed-up gearbox 6 . The two torsion arms 13 support the speed-increasing gearbox 6 from both sides, so that the force is uniform and the rigidity is improved.

Optionally, the part where each torsion arm 13 is connected to the frame is provided with a first elastic support 9 , and the first elastic support 9 is connected to the frame by bolts for bearing the weight and torque of the speed-up gearbox 6 . Wherein, the speed-increasing gearbox 6 is installed on the main frame. The first elastic support 9 bears the weight and torque of the gearbox, and transmits the torque to the main frame. Moreover, the first elastic support 9 can play a buffering role to prevent the speed-increasing gear box 6 from being strongly impacted.

Wherein, as shown in FIG. 1 , the front and rear sides of each torsion arm 13 are provided with first elastic supports 9 . The first elastic support 9 may be a rubber block, or other elastic and flexible material, which is not specifically limited in this embodiment.

In some optional implementations of this embodiment, as shown in Figures 1 and 2, the tail of the first elastic support 9 is provided with an axial hydraulic elastic support 12, and the axial hydraulic elastic support 12 provides pre-pressure through pressure oil . The axial hydraulic elastic support 12 provides pre-pressure to the first elastic support 9 to prevent the speed-up gearbox 6 from axially moving when subjected to an axial force.

The torque generated by the wind wheel is transmitted to the gearbox, and the gearbox transmits the torque transmitted from the impeller to the main frame through the elastic support of the torsion arm. During this process, the elastic support acts as a buffer.

Wherein, as shown in FIG. 2 , corresponding to two groups of torsion arms 13 , a total of 4 torsion arms 13 , the number of axial hydraulic elastic supports 12 is also 4, which are respectively arranged at the tail of the first elastic support 9 . The four axial hydraulic elastic supports 12 are distributed on both sides of the speed-increasing gearbox 6, and the two axial hydraulic elastic supports 12 on the same side can be connected through hydraulic pipes. After the transmission chain is installed at the specified position, the pressure oil is injected into the hydraulic pipe through the oil injection hole on the first elastic support 9, and the axial hydraulic elastic support 12 can provide pre-pressure. Wherein, the preload of the axial hydraulic elastic support 12 is adjustable, and a preload of a preset value is provided according to design requirements during actual use.

The working principle of the axial hydraulic elastic support 12 is as follows: because there is an axial play inside the main bearing 3, when the impeller bears the wind load, the transmission chain will produce axial movement, and this movement will affect the speed-up gearbox 6 and the high-speed coupling. Shaft 7 will have an impact. To solve this problem, an axial hydraulic elastic support 12 is arranged on the end face of the torque arm 13. The axial hydraulic elastic support 12 has two groups of left and right, which are respectively connected by hydraulic pipes. After the transmission chain is installed, each side The interior of the axial hydraulic elastic support 12 is filled with pre-pressure. On the one hand, it can provide a certain axial damping for the torsion arm 13. At the same time, when the speed-up gearbox 6 bears a large axial force, the internal pressure of the front axial hydraulic elastic support 12 The oil will be squeezed into the rear axial hydraulic elastic support 12, and the rear axial hydraulic elastic support 12 can prevent the movement of the speed-up gearbox 6 at the same time, reduce the amount of axial movement, thereby protecting the speed-up gearbox 6.

Because the axial force borne by the transmission system of the wind turbine is basically the axial force along the direction 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 . Certainly, those skilled in the art may also respectively install axial hydraulic elastic supports 12 at the front end and the tail of the first elastic support 9 for two-way limiting, which is not specifically limited in this embodiment.

In some optional implementations of this embodiment, a second elastic support 10 is provided between the generator 8 and the frame. Wherein, generator 8 can be installed on the rear frame. The second elastic support 10 bears the weight and torque of the generator 8 and transmits the torque to the rear frame. During the torque transmission process, the second elastic support 10 can provide certain damping and protect the generator 8 to a certain extent.

Wherein, the first elastic support 9 may be a rubber block, etc., or other elastic and flexible materials, which are not specifically limited in this embodiment.

In some optional implementations of this embodiment, the main shaft 1 is covered with a bearing seat 2, the main bearing 3 is arranged between the main shaft 1 and the bearing seat 2, and the tail of the main bearing 3 is provided with a bearing seat attachment 4 for use in It is used to fix the main bearing 3, and to lubricate and prevent dust. By setting the main bearing 3 and the bearing seat 2, the main shaft 1 is supported and fixed, and the rotation of the main shaft 1 is facilitated. Bearing seat attachment 4 can limit the axial slippage of the main bearing 3, play the role of fixing the main bearing 3, and can store the lubricating oil of the main bearing 3, lubricate the main bearing 3, and prevent impurities such as external dust from entering the main bearing 3.

In some optional implementations of this embodiment, the main bearing 3 is a double-row spherical roller bearing. The bearing has a large radial load capacity and can also bear heavy loads and impact loads. And because of its self-aligning performance, it can withstand axial loads in two directions to a certain extent.

Optionally, a lock nut 5 is provided at the tail of the bearing seat attachment 4 for limiting the position of the main bearing 3 to avoid axial movement.

As shown in Figure 2, the bearing seat attachment 4 can be set on the main shaft 1 and seal the main bearing 3. The lock nut 5 is sleeved on the main shaft 1 to block and fix the bearing seat accessory 4 .

Because the axial force borne by the transmission system of the wind turbine is basically the axial force along the direction from the front end to the tail of the main shaft 1 . Therefore, it is only necessary to set the lock nut 5 at the tail of the bearing seat attachment 4. Of course, those skilled in the art can also respectively install lock nuts 5 at the front end and the tail portion of the main bearing 3 for two-way limit, which is not specifically limited in this embodiment.

In this embodiment, as shown in accompanying drawings 1 and 2, the high-speed coupling 7 is connected between the speed-increasing gearbox 6 and the generator 8 to transmit torque. The current is transmitted to the speed-increasing gearbox 6, causing electric corrosion to the speed-increasing gearbox 6. At the same time, a torque limiter is installed inside the high-speed coupling 7. When the torque of the torque limiter reaches the set value, the torque limiter will slip to avoid The large torque is transmitted to the speed-up gear box 6, so as to avoid impact on the speed-up gear box 6 when the generator 8 is short-circuited, and protect the speed-up gear box 6.

Optionally, as shown in accompanying drawings 1 and 2, a high-speed shaft brake 11 is provided at the rear of the speed-up gearbox 6, and the high-speed shaft brake 11 acts on the brake disc of the high-speed shaft coupling 7, and is connected with the high-speed shaft coupling Jointly realize the mechanical braking function of the transmission system, which is convenient for the inspection and maintenance of the transmission chain and the inside of the wheel hub in the later stage.

It should be noted that in this article, relative 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 these No such actual relationship or order exists between entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. In addition, the terms "front", "rear", "left", "right", "upper", and "lower" herein refer to the placement states shown in the drawings.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; 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 various embodiments of the present invention.

Claims (10)

1. A wind turbine transmission system, comprising: the system comprises a main shaft, a speed-up gear box, a high-speed coupler and a generator;

the front end of the main shaft is connected with the impeller, and the tail part of the main shaft is connected with the front end of the speed-up gear box through a tensioning sleeve and used for transmitting the rotation of the impeller to the speed-up gear box;

the tail part of the speed-increasing gear box is connected with the generator through the high-speed coupler and is used for transmitting the rotating speed of the impeller to the generator after being increased;

the speed-increasing gear box is provided with at least two groups of torque arms which are respectively arranged at the front part and the tail part of the speed-increasing gear box.

2. The wind turbine transmission system of claim 1, wherein each set of the torsion arms includes two torsion arms disposed on either side of the step-up gear box.

3. The wind turbine generator transmission system according to claim 2, wherein a first elastic support is arranged at a position where each torsion arm is connected with the frame, and the first elastic support is connected with the frame through a bolt and used for bearing the weight and the torque of the speed-increasing gear box.

4. The wind turbine generator transmission system according to claim 3, wherein an axial hydraulic elastic support is arranged at the tail of the first elastic support, and two axial hydraulic elastic supports located on the same side of the speed increasing gear box are connected through a hydraulic pipe to prevent axial movement of the speed increasing gear box.

5. The wind turbine generator transmission system according to claim 1, wherein a second elastic support is provided between the generator and the frame.

6. The transmission system of the wind turbine generator set according to claim 1, wherein a bearing seat is sleeved on the main shaft, a main bearing is arranged between the main shaft and the bearing seat, and bearing seat accessories are arranged on two sides of the main bearing and used for fixing the main bearing and performing lubrication and dust prevention.

7. The wind turbine transmission system of claim 6, wherein the main bearing is a double row self aligning roller bearing.

8. The wind turbine generator transmission system according to claim 7, wherein the tail part of the bearing seat attachment is provided with a lock nut for limiting the main bearing to prevent axial play.

9. The wind turbine transmission system according to claim 1, wherein the high speed coupling is provided with a torque limiter for slipping the high speed coupling when the torque exceeds a set value.

10. The wind turbine generator transmission system according to claim 1, wherein a high-speed shaft brake is arranged at the tail of the speed-increasing gearbox, and acts on a brake disc of the high-speed coupling to brake the high-speed coupling.

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