A blade vibration reduction device for a wind turbine

Abstract

The present invention discloses a blade damping device for a wind turbine, comprising a limit plate, a slide bar, a fixed block and a sleeve; the sleeve is used to connect the blades of the wind turbine, the root of the blade is fixed on the sleeve, the sleeve is sleeved on one end of the rotating shaft of the wind turbine, and the sleeve can slide along the axial direction of the rotating shaft; the limit plate is fixed on the rotating shaft, one end of the slide bar is connected to the sleeve, and the other end passes through the limit plate and is connected to the fixed block; a first elastic member is arranged between the limit plate and the sleeve, and a second elastic member is arranged between the fixed block and the limit plate. Through such a damping device, when encountering strong wind conditions, the strong wind blows the blades, exerting an axial force on the blades, thereby causing the spring between the limit plate and the baffle to be squeezed, and the spring between the fixed block and the limit plate to be stretched, thereby effectively playing a damping and buffering function, avoiding damage to the blades due to strong wind, causing economic losses, and ensuring safety.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a blade vibration reduction device of a wind power generator. Background Art

[0002] In today's global context of increasing shortage of non-renewable energy, drastic climate change and deteriorating environment, wind energy as a renewable and green energy has attracted great attention from all countries and will also be the main direction of my country's current new energy utilization. In wind power generation, due to the unpredictable wind speed in nature, in strong winds, the blades are blown by strong winds. Without shock absorption, the blades will be damaged, resulting in great economic losses and low safety. Summary of the invention

[0003] In view of the problems of the prior art, the present invention provides a blade vibration reduction device for a wind turbine, the purpose of which is to reduce the vibration of the blades through the vibration reduction device under strong wind conditions, avoid damage to the blades, reduce unnecessary economic losses, and ensure safety.

[0004] To solve the above problems, the present invention solves them through the following technical solutions:

[0005] A blade vibration reduction device for a wind turbine generator comprises a limit plate, a slide bar, a fixing block and a sleeve;

[0006] The sleeve is used to connect the blades of the wind turbine generator, the root of the blade is fixed on the sleeve, the sleeve is sleeved on one end of the rotating shaft of the wind turbine generator, and the sleeve can slide along the axial direction of the rotating shaft;

[0007] The limit plate is fixed on the rotating shaft, one end of the sliding rod is connected to the sleeve, and the other end passes through the limit plate and is connected to the fixed block; a first elastic member is arranged between the limit plate and the sleeve, and a second elastic member is arranged between the fixed block and the limit plate.

[0008] Furthermore, the other end of the rotating shaft is arranged in a bearing fixed on the support plate, a ring is also sleeved on the sleeve, and the sleeve and the ring can rotate relatively, and a third elastic member is connected between the protruding end of the ring and the support plate.

[0009] Furthermore, the shock absorbing device also includes a first retaining ring, the two first retaining rings are sleeved on the sleeve and fixedly connected to the sleeve, a groove is formed between the two first retaining rings, the ring is sleeved on the sleeve, and the ring is set in the groove formed between the two first retaining rings.

[0010] Furthermore, a ball is provided on a contact surface between the collar and the first retaining ring, and a ball is provided on a contact surface between the collar and the sleeve.

[0011] Furthermore, the protruding end of the collar is fixedly connected to a fixing plate, the fixing plate is connected to a slide cylinder, and the third elastic member is arranged in the slide cylinder;

[0012] The shock absorbing device also includes a cross bar, one end of which is fixed on the support plate, and the other end of which extends into the slide cylinder from the end opening of the slide cylinder and abuts against one end of the third elastic member, and the other end of the third elastic member abuts against the bottom of the slide cylinder.

[0013] Furthermore, it also includes a slider, which is arranged between the third elastic member and the cross bar, and the slider is fixedly connected to the cross bar; the area of ​​the end opening of the slide cylinder is smaller than the cross-sectional area of ​​the slider.

[0014] Furthermore, the first elastic member is a spring, which is sleeved on the sliding rod between the limiting plate and the sleeve; the second elastic member is a spring, which is sleeved on the sliding rod between the limiting plate and the fixing block.

[0015] Furthermore, a baffle is provided on the sleeve, the slide rod and the sleeve are connected via the baffle, and a plurality of through holes corresponding to the slide rod are formed on the limit plate.

[0016] Furthermore, one end of the rotating shaft passes through the sleeve and is fixedly connected to a stopper, a second stopper ring is sleeved on the rotating shaft between the stopper and the sleeve, and the stopper presses the second stopper ring onto the sleeve; the other end of the rotating shaft is fixedly connected to the first turntable.

[0017] Furthermore, the cross section of the rotating shaft between the limiting plate and the stopper is a square cross section, and the inner ring of the sleeve matches the outer ring of the rotating shaft.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: the present invention includes a limit plate, a sliding rod, a fixed block and a sleeve, the sleeve is used to connect the blades of the wind turbine, the root of the blade is fixed on the sleeve, the sleeve is sleeved on one end of the rotating shaft of the wind turbine, and the sleeve can slide along the axial direction of the rotating shaft; the limit plate is fixed on the rotating shaft, one end of the sliding rod is connected to the sleeve, and the other end passes through the limit plate and is connected to the fixed block; a first elastic member is arranged between the limit plate and the sleeve, and a second elastic member is arranged between the fixed block and the limit plate. By using such a shock absorbing device, when encountering strong wind conditions, the strong wind blows the blades, exerting an axial force on the blades, thereby causing the sleeve to slide along the rotating shaft toward the limit plate, and then causing the sleeve to push the sliding rod to move relative to the limit plate. At this time, the first elastic member between the limit plate and the sleeve is squeezed, and the second elastic member between the fixed block and the limit plate is stretched, that is, the first elastic member and the second elastic member both give the sleeve a force opposite to the sliding direction of the sleeve, thereby effectively playing a shock absorbing and buffering function, avoiding damage to the blades due to strong winds, causing economic losses, and ensuring safety.

[0019] Furthermore, the other end of the rotating shaft is arranged in a bearing fixed on the support plate, a collar is also sleeved on the sleeve, and the sleeve and the collar can rotate relative to each other, and a third elastic member is connected between the protruding end of the collar and the support plate. When encountering strong wind conditions, the strong wind blows the blades, exerting an axial force on the blades, causing the sleeve to slide toward the direction of the support plate, and then driving the collar close to the support plate, so that the third elastic member connected between the protruding end of the collar and the support plate is squeezed, that is, the third elastic member gives the sleeve a force opposite to the sliding direction of the sleeve, thereby more effectively playing a shock-absorbing and buffering function, avoiding damage to the blades due to strong winds, causing economic losses, and ensuring safety; in addition, the setting of the two sets of shock-absorbing systems is similar to multi-point support, which can prevent the blades from overturning when the blades are subjected to unbalanced forces.

[0020] Furthermore, the shock absorbing device further comprises a first retaining ring, the two first retaining rings are sleeved on the sleeve and fixedly connected to the sleeve, a slot is formed between the two first retaining rings, the collar is sleeved on the sleeve, and the collar is arranged in the slot formed between the two first retaining rings. The collar is fixed by the slot formed between the two first retaining rings, which is convenient and firm, and easy to install and disassemble.

[0021] Furthermore, the contact surface between the collar and the first retaining ring is provided with balls, and the contact surface between the collar and the sleeve is provided with balls. The balls can effectively reduce friction and ensure that the working process is stable and reliable, thereby extending the service life of the shock absorbing device.

[0022] Furthermore, the extended end of the collar is fixedly connected to a fixed plate, a slide is connected to the fixed plate, and the third elastic member is arranged in the slide; the shock absorbing device also includes a cross bar, one end of which is fixed to the support plate, and the other end extends from the end opening of the slide into the slide to abut against one end of the third elastic member, and the other end of the third elastic member abuts against the bottom of the slide. The slide can play a guiding and positioning role, ensuring the stability of the equipment during the shock absorption process and enhancing the shock absorption effect.

[0023] Furthermore, the shock absorbing device also includes a slider, which is arranged between the third elastic member and the cross bar, and the slider is fixedly connected to the cross bar. Because the area of ​​the end opening of the slide cylinder is smaller than the cross-sectional area of ​​the slider, this ensures that the slider will not slip out of the slide cylinder, that is, it ensures that the cross bar will not detach from the slide cylinder, resulting in the problem that the position cannot be automatically restored.

[0024] Furthermore, the first elastic member is a spring, which is sleeved on the slide bar between the limit plate and the sleeve; the second elastic member is a spring, which is sleeved on the slide bar between the limit plate and the fixed block. By sleeved the spring on the slide bar between the limit plate and the sleeve and the slide bar between the limit plate and the fixed block, the slide bar can effectively guide and fix the spring to prevent the spring from being excessively deformed and affecting the elastic function of the spring.

[0025] Furthermore, a baffle is provided on the sleeve, and the slide rod and the sleeve are connected via the baffle, and a plurality of through holes corresponding to the slide rod are opened on the limit plate, thereby ensuring the straightness of the slide rod and the limit plate during relative linear motion, and avoiding the problem of jamming between the slide rod and the limit plate.

[0026] Furthermore, the cross-section of the rotating shaft between the limit plate and the stop block is a square cross-section, and the inner ring of the sleeve matches the outer ring of the rotating shaft, which ensures that the sleeve can drive the rotating shaft to rotate together when rotating, while not affecting the sliding of the sleeve in the axial direction of the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] In the figure: 1- sleeve; 2- rotating shaft; 3- second retaining ring; 4- block; 5- blade; 6- first retaining ring; 7- collar; 8- ball; 9- fixed plate; 10- slide cylinder; 11- third spring; 12- slider; 13- cross bar; 14- support plate; 15 second retaining ring; 16- first turntable; 17- belt; 18- generator; 19 second turntable; 20- fixed block; 21- second spring; 22- slide bar; 23- limit plate; 24- baffle; 25- first spring. DETAILED DESCRIPTION

[0029] The present invention is explained in detail below in conjunction with the accompanying drawings and specific embodiments:

[0030] like Figure 1 As shown, the present invention comprises a sleeve 1 and a rotating shaft 2, wherein the rotating shaft 2 is sleeved in the sleeve 1, and the sleeve 1 can slide axially along the rotating shaft 2, and one end of the rotating shaft 2 passes through the sleeve 1 and is fixedly connected with a stopper 4, and a second stopper ring 3 is sleeved on the rotating shaft 2 at the side end of the stopper 4, and the side end of the second stopper ring 3 is fitted and connected with one end of the sleeve 1; the other end of the rotating shaft 2 passes through the sleeve 1 and passes through the limit plate 23, the support plate 14 and the first rotating disk 16 in sequence. The cross section of the rotating shaft 2 between the limit plate 23 and the stopper 4 is square, and the rest is circular, and the inside of the sleeve 1 is also a square cross section matching the square cross section of the rotating shaft 2, so that the sleeve 1 has only axial freedom on the rotating shaft 2, that is, the sleeve 1 can only slide axially along the rotating shaft 2. The limit plate 23 in the present invention is a disc, and the first rotating disk 16 and the disc are both fixedly connected to the rotating shaft 2, and the support plate 14 is rotatably connected to the rotating shaft 2, that is, the rotating shaft 2 can rotate relative to the support plate 14. A second retaining ring 15 is fixedly connected to the rotating shaft 2 on both sides of the support plate 14 and fits therewith. A generator 18 is fixedly connected to one side of the support plate 14. The rotating shaft of the generator 18 is fixedly connected to a second turntable 19. The second turntable 19 is connected to the first turntable 16 through a belt 17.

[0031] A plurality of blades 5 are fixedly connected to one end of the sleeve 1 close to the second retaining ring 3, and the plurality of blades 5 are in the same plane. Two first retaining rings 6 are fixedly connected to the sleeve 1 between the blades 5 and the baffle 24, and a collar 7 is rotatably connected to the sleeve 1 between the two first retaining rings 6, that is, the sleeve 1 can rotate relative to the collar 7. The side end of the collar 7 fits with the first retaining ring 6, and a plurality of balls 8 are embedded in the contact between the collar 7, the first retaining ring 6 and the sleeve 1, which can effectively reduce the friction force and thus extend the service life of the shock absorbing device. A fixed plate 9 is fixedly connected to the bottom end of the collar 7, a slide 10 is fixedly connected to one side of the fixed plate 9, a slider 12 is slidably connected in the slider 10, a third spring 11 is fixedly connected between the slider 12 and the fixed plate 9, a cross bar 13 is fixedly connected to the side end of the slider 12, and one end of the cross bar 13 passes through the slide 10 and is fixedly connected to the side end of the support plate 14.

[0032] A baffle 24 is fixedly sleeved on the sleeve 1 at the side end of the ring 7, and the top and bottom of the side end of the baffle 24 are fixedly connected with a slide rod 22. A plurality of through holes corresponding to the slide rod 22 are opened on the limit plate 23. One end of the slide rod 22 passes through the through hole of the limit plate 23 and is fixedly connected with a fixed block 20. A second spring 21 is fixedly connected between the fixed block 20 and the disc 23, and the second spring 21 is sleeved on the slide rod 22. A first spring 25 is fixedly connected between the limit plate 23 and the baffle 24, and the first spring 25 is sleeved on the slide rod 22.

[0033] The working principle of the present invention is as follows: when the present invention is in use, the blades 5 on the sleeve 1 are rotated by the external wind force, and the device fixedly connected on the sleeve 1 rotates synchronously. Because the rotating shaft 2 between the disc 23 and the block 4 is a square cross-section, the rotating shaft 2 is driven to rotate. At this time, the first turntable 16 rotates, and the second turntable 19 is connected to rotate through the belt 17, so that the generator 18 operates to convert wind energy into electrical energy. During the rotation process, when the sleeve 1 drives the first retaining ring 6 to rotate, the ball 8 on the collar 7 will effectively reduce the friction. When encountering strong winds, the blades 5 are blown to apply force, driving the sleeve 1 to slide toward the support plate 14, and then driving the fixed plate 9 and the slide cylinder 10 to slide synchronously, which will cause the slider 12 to squeeze the third spring 11. At the same time, the baffle 24 drives the slide rod 22 to slide on the disc 23. This process will also squeeze the first spring 25 and stretch the second spring 21. Then, multiple springs operate at the same time, effectively playing a shock-absorbing and buffering function, avoiding damage to the blades 5 due to strong winds, causing economic losses, and ensuring safety.

Claims

1. A blade vibration reduction device for a wind turbine, characterized in that: It comprises a limiting plate (23), a sliding rod (22), a fixing block (20) and a sleeve (1); The sleeve (1) is used to connect the blades of a wind turbine generator, the root of the blade is fixed on the sleeve (1), the sleeve (1) is sleeved on one end of the rotating shaft (2) of the wind turbine generator, and the sleeve (1) can slide along the axial direction of the rotating shaft (2); The limit plate (23) is fixed on the rotating shaft (2); one end of the sliding rod (22) is connected to the sleeve (1), and the other end passes through the limit plate (23) and is connected to a fixed block (20); a first elastic member (25) is arranged between the limit plate (23) and the sleeve (1), and a second elastic member (21) is arranged between the fixed block (20) and the limit plate (23); the other end of the rotating shaft (2) is arranged in a bearing fixed on the support plate (14); a sleeve (1) is also sleeved with a collar (7), and the sleeve (1) and the collar (7) can rotate relative to each other; a third elastic member (11) is connected between the protruding end of the collar (7) and the support plate (14); the protruding end of the collar (7) is fixedly connected to a fixed plate (9), and a sliding cylinder (10) is connected to the fixed plate (9), and the third elastic member (11) is arranged in the sliding cylinder (10); The shock absorbing device also includes a cross bar (13), one end of which is fixed on the support plate (14), and the other end of which extends into the slide cylinder (10) from the end opening of the slide cylinder (10) to abut against one end of the third elastic member (11), and the other end of the third elastic member (11) abuts against the bottom of the slide cylinder (10).

2. A blade vibration reduction device for a wind turbine according to claim 1, characterized in that: The shock absorbing device further comprises a first retaining ring (6), wherein the two first retaining rings (6) are sleeved on the sleeve (1) and fixedly connected to the sleeve (1), a groove is formed between the two first retaining rings (6), and the sleeve ring (7) is sleeved on the sleeve (1), and the sleeve ring (7) is arranged in the groove formed between the two first retaining rings (6).

3. A blade vibration reduction device for a wind turbine according to claim 2, characterized in that: The contact surface between the collar (7) and the first retaining ring (6) is provided with a ball (8), and the contact surface between the collar (7) and the sleeve (1) is provided with a ball (8).

4. The blade vibration reduction device of a wind turbine according to claim 1, characterized in that: It also includes a slider (12), which is arranged between the third elastic member (11) and the cross bar (13), and the slider (12) is fixedly connected to the cross bar (13); the area of ​​the end opening of the slide cylinder (10) is smaller than the cross-sectional area of ​​the slider (12).

5. The blade vibration reduction device of a wind turbine according to claim 1, characterized in that: The first elastic member (25) is a spring, which is sleeved on the slide bar (22) between the limit plate (23) and the sleeve (1); the second elastic member (21) is a spring, which is sleeved on the slide bar (22) between the limit plate (23) and the fixed block (20).

6. The blade vibration reduction device of a wind turbine according to claim 1, characterized in that: The sleeve (1) is provided with a baffle (24), the slide bar (22) and the sleeve (1) are connected via the baffle (24), and the limit plate (23) is provided with a plurality of through holes corresponding to the slide bar (22).

7. The blade vibration reduction device of a wind turbine according to claim 1, characterized in that: One end of the rotating shaft (2) passes through the sleeve (1) and is fixedly connected to a stopper (4); a second stopper ring (3) is sleeved on the rotating shaft (2) between the stopper block (4) and the sleeve (1); the stopper block (4) presses the second stopper ring (3) onto the sleeve (1); and the other end of the rotating shaft (2) is fixedly connected to a first rotating disk (16).

8. The blade vibration reduction device of a wind turbine according to claim 6, characterized in that: The cross section of the rotating shaft (2) between the limiting plate (23) and the stopper (4) is a square cross section, and the inner ring of the sleeve (1) matches the outer ring of the rotating shaft (2).

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