Yaw driving system of wind generating set

Abstract

The utility model relates to a yaw driving system of a wind generating set, which comprises a central driving device arranged at the central position of a rack and used for driving the rack to rotate, a barrel body arranged below the rack, and the rack and the barrel body are coaxial; the rotary supporting mechanism is arranged between the rack and the barrel; and the central driving end of the central driving device is in transmission connection with the rack. According to the yaw driving system of the wind generating set, the center driving device is arranged at the position of the center axis of the rack to drive the rack to rotate, and the problems that in the prior art, the number of driving speed reducers is large, and asynchronization exists are solved; the driving device of the yaw driving system of the wind generating set is installed in the center, so that power transmission can be optimized, the stability and transmission efficiency of the whole structure are improved, vibration caused by uneven wind power is reduced, and the layout of the internal space of the rack is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, in particular to a yaw drive system of a wind generator set. Background Art

[0002] The wind turbine's yaw system uses wind speed and direction sensors to obtain wind direction information. The control system generates control signals based on this wind direction information and uses the yaw drive system to adjust the rotor's orientation to always face the wind. This allows the wind turbine to maximize wind energy and convert it into electricity, improving power generation efficiency and stability.

[0003] In the prior art, the yaw drive system of a wind turbine generator set drives a reducer through an electric motor or a hydraulic motor. The small gear ring on the reducer meshes with the large gear ring on the tower to rotate the frame to align with the wind direction. Most of the time, motor yaw is used.

[0004] The yaw drive system of wind turbines in the prior art has the following disadvantages: (1) large yaw torque and a large number of motors; (2) slow yaw speed, large motor reduction ratio and high cost; (3) due to the large number of drive reducers, there is a synchronization problem, and due to frequent reversing impact, there is a problem of gear wear and fracture. If the large ring gear is damaged, it can only be re-hoisted, which has high maintenance costs; (4) when the unit stops generating electricity normally, the caliper or brake device fixes the unit, and the friction force it provides should be large enough to prevent the head from swinging under the action of wind. However, when the wind load changes drastically, the friction force provided by the caliper or brake is not enough to resist such force, and the head will swing. The swing of the head will cause uneven force on the drive teeth connected to it. Under long-term or frequent uneven force conditions, some drive teeth may break due to excessive stress. Utility Model Content

[0005] The utility model addresses the deficiencies in the prior art and provides a wind turbine yaw drive system that does not require gear transmission, thereby avoiding tooth breakage and maintenance hoisting problems. At the same time, the drive device is centrally installed to solve the problem of asynchrony.

[0006] The purpose of the utility model is achieved in the following manner: a yaw drive system for a wind turbine generator set, comprising:

[0007] A central driving device is provided at the center of the frame and is used to drive the frame to rotate. A cylinder is provided below the frame. The frame and the cylinder are coaxial. The nacelle of the wind turbine is connected to the frame (200).

[0008] A rotating support mechanism is provided between the frame and the cylinder;

[0009] The central driving end of the central driving shaft of the central driving device is transmission-connected to the frame.

[0010] As an optional solution of the technical solution of the present utility model, the central driving end of the central driving shaft is transmission-connected to the frame via a connecting frame.

[0011] As an optional solution of the technical solution of the present utility model, a support frame is provided in the cylinder, the fixed end of the central driving device is connected to the center of the support frame, and the central driving device is provided with a braking mechanism.

[0012] As an optional solution of the technical solution of the present utility model, the rotating support mechanism is a sliding bearing or a rolling bearing, the rotating part of the sliding bearing or the rolling bearing is transmission-connected to the central driving end of the central driving shaft, and the fixed part of the sliding bearing or the rolling bearing is connected to the cylinder.

[0013] As an optional solution of the technical solution of the utility model, the rotation support mechanism is a caliper connection mechanism, including:

[0014] A connecting ring connected to the cylinder;

[0015] a plurality of calipers, clamped on the inner circumference of the connecting ring, and the calipers are connected to the frame;

[0016] The friction plate is arranged between the upper and lower contact surfaces of the caliper and the connecting ring.

[0017] As an optional solution of the technical solution of the present utility model, the driving power of the central driving device is a plurality of motors or motors connected in series to drive the central driving end of the central driving shaft to rotate.

[0018] As an optional solution to the technical solution of the present utility model, the driving power of the central drive device is a single motor or multiple motors or motors connected in series to directly drive the central drive end of the central drive shaft to rotate, and the central drive end of the central drive shaft is directly connected to the frame for driving.

[0019] The beneficial effects of the utility model are:

[0020] (1) The yaw drive system of the wind turbine generator set of the present invention drives the frame to rotate by arranging a central drive device at the central axis of the frame, thereby solving the problem of a large number of drive reducers and asynchronism in the prior art;

[0021] (2) The central driving end of the central driving shaft is connected to the frame through a connecting frame, and the fixed end of the central driving device is connected to the center of the support frame. The support frame and the connecting frame limit the frame, which can achieve center limit and is simple and convenient to install;

[0022] (3) The central installation of the drive device of the yaw drive system of the wind turbine generator set of the utility model can lower the center of gravity of the wind turbine generator, improve the stability of the overall structure, optimize the layout of the internal space of the frame, and facilitate the configuration and installation of other equipment. In addition, the number of drive motors is small, the cost is low, and no gear transmission is required, thus avoiding tooth breakage and maintenance and hoisting problems. At the same time, the bearing does not need to be processed with a gear ring, thus reducing manufacturing costs.

[0023] (4) The yaw drive system of the wind turbine generator set of the present invention is driven by a central drive device and also has a braking and locking function, which simplifies the overall structure of the machine and reduces manufacturing and installation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 This is a schematic structural diagram of the yaw drive system of the wind turbine generator set of the present invention;

[0026] Figure 2 This is a cross-sectional view of the yaw drive system of the wind turbine generator set in the first embodiment of the present invention;

[0027] Figure 3 This is a cross-sectional view of the yaw drive system of the wind turbine generator set in the second embodiment of the present utility model;

[0028] Figure 4 for Figure 3 A partial enlarged view of middle A.

[0029] Reference numerals:

[0030] 100-center drive device; 101-center drive end of center drive shaft;

[0031] 200-rack; 201-connecting frame;

[0032] 300-cylinder; 301-support frame;

[0033] 400 - Rotational support mechanism; 401 - Connecting ring; 402 - Caliper; 403 - Friction plate. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In the description of the embodiments, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, connections through an intermediary medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on their specific circumstances.

[0037] Example 1

[0038] The yaw drive system of a wind turbine generator system includes a central drive device 100 and a rotating support mechanism 400. The central drive device 100 is located at the center of the frame 200 and is used to drive the frame 100 to rotate. The central drive device 100 is equipped with a braking mechanism that can provide full braking force or partial braking force. Full braking force can ensure that the yaw is not blown off, while partial braking can provide the desired braking force and be affected by wind. A cylinder 300 is provided below the frame 200, and the frame 200 and the cylinder 300 are coaxial. Therefore, the central driving device 100 is installed coaxially with the frame 200 and the cylinder 300; the central driving end 101 of the central driving shaft of the central driving device 100 is transmission-connected to the frame 200, and a support frame 301 is provided in the cylinder 300, and the fixed end of the central driving device 100 is connected to the center of the support frame 301. The setting of the support frame 301, on the one hand, strengthens the supporting effect of the cylinder 300 on the frame 200, and at the same time, limits the central driving device 100, and further limits the frame 200, to prevent the frame from swinging when the wind load changes drastically.

[0039] The center drive end 101 of the center drive shaft is connected to the frame 200 through the connecting frame 201. In this example, the center drive end 101 of the center drive shaft is directly connected to the frame 200 through the connecting frame 201 instead of using a gear transmission connection. Therefore, tooth breakage and maintenance lifting problems can be avoided. At the same time, the bearing does not need to process the gear ring, reducing manufacturing costs.

[0040] The rotating support mechanism 400 is arranged between the frame 200 and the cylinder 300. In this embodiment, the rotating support mechanism 400 is a sliding bearing or a rolling bearing. The rotating part of the sliding bearing or the rolling bearing is transmission-connected to the central driving end 101 of the central driving shaft, and the fixed part of the sliding bearing or the rolling bearing is connected to the cylinder 300.

[0041] When the direction of the wind wheel needs to be adjusted, the central driving device 100 works, the central driving end 101 of the central driving shaft rotates, and drives the frame 200 to rotate through the connecting frame 201.

[0042] Example 2

[0043] The rotation support mechanism 400 of this embodiment is a caliper connection mechanism, comprising a connecting ring 401, a plurality of calipers 402, and a friction plate 403. The outer portion of the connecting ring 401 is fixedly connected to the wall of the cylinder 300, while the inner portion of the connecting ring 401 extends into the cylinder. The plurality of calipers 402 are mounted on the inner circumference of the connecting ring 401 and are fixedly connected to the frame 200. The friction plate 403 is located between the upper and lower contact surfaces of the calipers 402 and the connecting ring 401, providing friction to maintain stability during yaw.

[0044] In the present invention, the driving power of the central drive device 100 can be multiple motors or motors connected in series to drive the central drive end 101 of the central drive shaft to rotate. Alternatively, a single motor can directly drive the central drive end 101 of the central drive shaft to rotate, and the central drive end 101 of the central drive shaft is directly connected to the frame 200. The motor or motor is not limited to one type, and preferably the motor drives the reducer, and the type of reducer is not limited.

[0045] In this utility model Figure 1-3 In the figure, the central axis (stator) of the central driving device 100 is fixedly connected to the cylinder 300, and the central driving end 101 is the rotor of the rotary motor or the rotary motor. Of course, according to actual needs, the central axis of the central driving device 100 is connected to the frame 200, and the central axis is the rotating axis.

[0046] The yaw drive system of the wind turbine generator set of the present invention does not require gear transmission, thus avoiding broken teeth and maintenance hoisting problems. The drive device is centrally installed, and there is no synchronization problem. The number of drive motors is small and the cost is low. The drive motor is placed inside the tower, which can increase the tower diameter and increase the tower's load resistance. The bearing does not need to be processed with a gear ring, thus reducing manufacturing costs.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. In addition, the technical solutions of the various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is inconsistent or cannot be implemented, it shall be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A yaw drive system for a wind turbine generator set, characterized in that: include: A central driving device (100) is provided at the center of the frame (200) and is used to drive the frame (200) to rotate. A cylinder (300) is provided below the frame (200). The frame (200) and the cylinder (300) are coaxial. The nacelle of the wind turbine is connected to the frame (200). A rotation support mechanism (400) is provided between the frame (200) and the cylinder (300); The central driving end (101) of the central driving device (100) is drivingly connected to the frame (200).

2. The yaw drive system of a wind turbine generator set according to claim 1, characterized in that: The central driving end (101) is transmission-connected to the frame (200) via a connecting frame (201).

3. The yaw drive system of a wind turbine generator set according to claim 1, characterized in that: A support frame (301) is provided in the cylinder (300), a fixed end of the central driving device (100) is connected to the center of the support frame (301), and the central driving device (100) is provided with a braking mechanism.

4. The yaw drive system of a wind turbine generator set according to claim 1, characterized in that: The rotary support mechanism (400) is a sliding bearing or a rolling bearing, the rotating portion of the sliding bearing or the rolling bearing is transmission-connected to the central driving end (101), and the fixed portion of the rotating portion of the sliding bearing or the rolling bearing is connected to the cylinder (300).

5. The yaw drive system of a wind turbine generator set according to claim 1, characterized in that: The rotation support mechanism (400) is a caliper connection mechanism, comprising: A connecting ring (401) connected to the cylinder (300); A plurality of calipers (402) are clamped on the inner circumference of the connecting ring (401), and the calipers (402) are connected to the frame (200); The friction plate (403) is provided between the upper and lower contact surfaces of the caliper (402) and the connecting ring (401).

6. The yaw drive system of a wind turbine generator set according to claim 1, characterized in that: The driving power of the central driving device (100) is a plurality of motors or motors connected in series to drive the central driving end (101) to rotate.

7. The yaw drive system of a wind turbine generator set according to claim 1, characterized in that: The driving power of the central driving device (100) is a single motor or a plurality of motors or motors connected in series, which directly drives the central driving end (101) to rotate, and the central driving end (101) is directly connected to the frame (200) for driving.

8. The yaw drive system of a wind turbine generator set according to claim 6 or 7, characterized in that: The electric motor or hydraulic motor drives a speed reducer with a large reduction ratio.

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