A main shaft of a horizontal axis wind turbine with built-in vibration damping

Abstract

The present invention discloses a main shaft of a horizontal-axis wind turbine generator set with built-in vibration reduction and damping, comprising a fixed tower, a support plate fixedly connected to the inner side wall of the fixed tower, a damping rod fixedly connected to the outer side wall of the support plate, a sleeve fixedly connected to the end of the damping rod, a main shaft rotatably connected to the inner side wall of the sleeve, an inner bearing fixedly connected to the outer side wall of the main shaft, an outer bearing rotatably connected to the outer side wall of the inner bearing, a sealing block symmetrically fixedly connected to the outer side wall of the outer bearing, a lubrication box fixedly connected to the inner side wall of the fixed tower, a lubrication mechanism slidably connected to the inner side wall of the lubrication box, the main shaft increases the distance the sleeve moves downward, thereby more lubricating oil can be delivered between the outer bearing and the inner bearing, and more gas can be compressed between the main shaft and the sealing block, so as to maintain a high-pressure state between the main shaft and the sealing block.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine generator sets, and in particular to a main shaft of a horizontal-axis wind turbine generator set with built-in vibration reduction and damping. Background Art

[0002] A wind turbine is an electric device that converts wind energy into mechanical work, which drives the rotor to rotate and finally outputs alternating current. A wind turbine generally consists of a wind rotor, a generator (including a device), a stabiliser (tail), a tower, a speed limit safety mechanism and an energy storage device.

[0003] The working principle of a wind turbine is relatively simple. The wind rotor rotates under the action of wind, which converts the kinetic energy of the wind into mechanical energy of the wind rotor shaft. The generator rotates and generates electricity under the drive of the wind rotor shaft. In a broad sense, wind energy is also solar energy, so it can also be said that a wind turbine is a heat energy generator that uses the sun as a heat source and the atmosphere as a working medium.

[0004] After searching, the utility model patent with Chinese patent number CN210859808U discloses a horizontal axis wind turbine main shaft with self-contained vibration damping, which is composed of a dynamic ring and a static ring. The static ring includes a static ring connecting ring arranged in the axial direction and a static ring fixing ring and a static ring sealing ring arranged in the radial direction. The static ring fixing ring is attached to the end cover and connected and fixed with the end cover by bolts. The static ring sealing ring, the static ring connecting ring and the end cover are sandwiched to form a sealing cavity. The cross section of the dynamic ring is L-shaped, including a dynamic ring sealing ring arranged in the radial direction and a dynamic ring connecting ring arranged in the axial direction. The dynamic ring connecting ring is sleeved on the shaft sleeve and fixed to the shaft sleeve. The outer circumference of the dynamic ring sealing ring is provided with a sealing lip, which is located in the sealing cavity, and the sealing lip is in close contact and sealing with the inner wall of the static ring sealing ring and the outer wall of the end cover. The device can be online modified and installed on the basis of the original structure of the main shaft of the wind turbine generator set, thereby improving the sealing performance of the wind turbine set and reducing the labor intensity of the staff for maintenance.

[0005] However, the above device will still leak during long-term use, thereby reducing the lubricating oil inside the bearing, and then increasing the friction inside the bearing during the rotation of the main shaft, which increases the vibration of the wind blades during rotation, reducing the service life of the main shaft and the bearings. Manual lubrication and maintenance of the bearings and the main shaft requires a lot of time and manpower, and also reduces the power generation time. Therefore, a horizontal-axis wind turbine main shaft with built-in vibration damping is needed. Summary of the invention

[0006] The purpose of the present invention is to solve the problem in the prior art that the lubricating oil inside the bearing leaks during long-term operation, resulting in reduced service life of the main shaft and the bearing, and to propose a main shaft of a horizontal-axis wind turbine with built-in vibration damping.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A main shaft of a horizontal-axis wind turbine with built-in vibration damping comprises a fixed tower, a support plate is fixedly connected to the inner side wall of the fixed tower, a damping rod is fixedly connected to the outer side wall of the support plate, a sleeve is fixedly connected to the end of the damping rod, a main shaft is rotatably connected to the inner side wall of the sleeve, an inner bearing is fixedly connected to the outer side wall of the main shaft, an outer bearing is rotatably connected to the outer side wall of the inner bearing, a sealing block is symmetrically fixedly connected to the outer side wall of the outer bearing, a lubrication box is fixedly connected to the inner side wall of the fixed tower, and the lubrication box is fixedly connected to the inner side wall of the fixed tower. A lubrication mechanism is slidably connected to the inner wall of the box, a locking box is fixedly connected to the inner wall of the fixed tower, a sealing mechanism is slidably connected to the inner wall of the locking box, a positioning groove is provided on the outer wall of the fixed tower, the main shaft passes through the positioning groove, a rotor blade is fixedly connected to the end of the main shaft, a spring is fixedly connected to the outer wall of the damping rod, the end of the spring is fixedly connected to the outer wall of the sleeve, a connecting rod is symmetrically fixedly connected to the outer wall of the outer bearing, and the end of the connecting rod is fixedly connected to the outer wall of the sleeve.

[0009] Preferably, the spring is wound around the outer side wall of the damping rod, and the spring is made of spring steel.

[0010] Preferably, sealing teeth are symmetrically fixedly connected to the outer side wall of the sealing block, and the sealing teeth are close to but not in contact with the outer side wall of the main shaft.

[0011] Preferably, the lubrication mechanism includes an extrusion plate slidably connected to the inner wall of the lubrication box, an extrusion rod is fixedly connected to the outer wall of the extrusion plate, the extrusion rod passes through the outer wall of the lubrication box, the lubrication box passes through the outer wall of the support plate, the end of the extrusion rod is fixedly connected to the outer wall of the sleeve, and a lubrication tube is fixedly installed on the bottom of the lubrication box.

[0012] Preferably, the extrusion plate is tightly fitted around the inner side wall of the lubrication box.

[0013] Preferably, the lubrication pipe passes through the outer wall of the outer bearing, a one-way discharge valve is fixedly installed inside the lubrication pipe, a through groove is opened on the outer wall of the lubrication box, an oil inlet pipe is fixedly connected to the outer wall of the extrusion plate, the oil inlet pipe passes through the outer wall of the lubrication box, and the oil inlet pipe passes through the outer wall of the fixed tower.

[0014] Preferably, the sealing mechanism includes a piston plate slidably connected to the inner wall of the locking box, a piston rod is fixedly connected to the outer side of the piston plate, the piston rod passes through the outer wall of the locking box, the piston rod passes through the outer wall of the support plate, the end of the piston rod is fixedly connected to the outer wall of the sleeve, and an exhaust pipe is fixedly connected to the outer wall of the locking box.

[0015] Preferably, the piston plate is tightly fitted around the inner side wall of the locking box.

[0016] Preferably, the end of the exhaust pipe passes through the outer wall of the sealing block, a limiting groove is provided on the outer wall of the locking box, and a one-way exhaust valve is fixedly installed inside the exhaust pipe.

[0017] Preferably, an air intake pipe is fixedly connected to the outer side wall of the locking box, the air intake pipe penetrates the outer side wall of the fixed tower, and a one-way air intake valve is fixedly installed on the inner side wall of the air intake pipe.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] During long-term use, leakage may occur, and the lubricating oil will flow out through the gap between the sealing block and the main shaft, thereby increasing the friction generated by the main shaft during operation. The reduction of lubricating oil makes it impossible to discharge the temperature generated by friction in time, thereby affecting the service life of the main shaft and the outer bearing, and then the rotor blades are accompanied by jamming during rotation. When the rotor blades jam, the main shaft will vibrate, and the main shaft causes the sleeve to move downward. During the downward movement of the sleeve, the extrusion rod moves downward, and the extrusion rod squeezes the lubricating oil inside the lubrication box through the extrusion plate. The lubricating oil is discharged between the inner bearing and the outer bearing through the lubrication pipe, and the lubricating oil between the outer bearing and the inner bearing is supplemented, thereby reducing the friction between the inner bearing and the outer bearing during rotation. At the same time, the heat generated during the rotation can be quickly discharged, thereby ensuring the service life of the inner bearing and the outer bearing, and making the main shaft more stable during rotation.

[0020] When the sleeve moves downward, the piston rod will move downward, and the piston rod will drive the piston plate to move downward. The downward movement of the piston plate will squeeze the gas inside the locking box, and the gas in the piston plate will move upward through the exhaust pipe, thereby rushing the gas through the exhaust pipe into the space between the sealing block and the main shaft to form high-pressure gas. The bearing is sealed by high pressure to avoid leakage of lubricating oil, thereby achieving lubrication and sealing of the main bearing of the wind turbine, thereby reducing the maintenance time of the wind turbine set and reducing a lot of manpower, while protecting the main shaft, outer bearing and inner bearing.

[0021] The more lubricating oil leaks between the outer bearing and the inner bearing, the more serious the jamming of the main shaft during operation will be. The main shaft will increase the distance the sleeve moves downward, so that more lubricating oil can be delivered between the outer bearing and the inner bearing. At the same time, more gas can be compressed between the main shaft and the sealing block to maintain the high pressure state between the main shaft and the sealing block. The coordinated use of the damping rod and the spring can reduce the damage to the main shaft and the bearing caused by vibration when there is a lack of oil inside the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a main shaft of a horizontal-axis wind turbine generator set with built-in vibration damping proposed by the present invention;

[0023] Figure 2 is a cross-sectional view of the bearing portion of the present invention;

[0024] Figure 3 is a side view of the bearing of the present invention;

[0025] Figure 4 It is an enlarged view of part A of the present invention;

[0026] Figure 5 It is an enlarged view of part B of the present invention;

[0027] Figure 6 It is an enlarged view of part C of the present invention;

[0028] Figure 7 This is an enlarged view of part D of the present invention.

[0029] In the figure: 1 fixed tower, 2 support plate, 3 damping rod, 4 sleeve, 5 main shaft, 6 outer bearing, 7 rotor blade, 8 sealing tooth, 9 lubrication box, 10 exhaust pipe, 11 lubrication pipe, 12 inner bearing, 13 connecting rod, 14 through groove, 15 sealing block, 16 spring, 17 piston rod, 18 positioning groove, 19 extrusion rod, 20 extrusion plate, 21 oil inlet pipe, 22 locking box, 23 suction pipe, 24 piston plate, 25 limit groove. DETAILED DESCRIPTION

[0030] 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.

[0031] Reference Figure 1-7A main shaft of a horizontal-axis wind turbine with self-contained vibration damping comprises a fixed tower 1, a support plate 2 is fixedly connected to the inner side wall of the fixed tower 1, a damping rod 3 is fixedly connected to the outer side wall of the support plate 2, a sleeve 4 is fixedly connected to the end of the damping rod 3, a main shaft 5 is rotatably connected to the inner side wall of the sleeve 4, an inner bearing 12 is fixedly connected to the outer side wall of the main shaft 5, an outer bearing 6 is rotatably connected to the outer side wall of the inner bearing 12, a positioning groove 18 is opened on the outer side wall of the fixed tower 1, the main shaft 5 passes through the positioning groove 18, a rotor blade 7 is fixedly connected to the end of the main shaft 5, a spring 16 is fixedly connected to the outer side wall of the damping rod 3, and the spring 16 The spring 16 is wound around the outer wall of the damping rod 3. The material of the spring 16 is spring steel. The spring steel has high tensile strength, elastic limit, fatigue strength and good elasticity, so that it can play a shock-absorbing role by contraction when subjected to external force. The end of the spring 16 is fixedly connected to the outer wall of the sleeve 4. The outer wall of the outer bearing 6 is symmetrically fixedly connected with a connecting rod 13. The end of the connecting rod 13 is fixedly connected to the outer wall of the sleeve 4. The outer wall of the outer bearing 6 is symmetrically fixedly connected with a sealing block 15. The outer wall of the sealing block 15 is symmetrically fixedly connected with a sealing tooth 8. The sealing tooth 8 is close to the outer wall of the main shaft 5 but does not touch it. The inner side of the fixed tower 1 A lubrication box 9 is fixedly connected to the wall, and a lubrication mechanism is slidably connected to the inner wall of the lubrication box 9. The lubrication mechanism includes an extrusion plate 20 slidably connected to the inner wall of the lubrication box 9, and an extrusion rod 19 is fixedly connected to the outer wall of the extrusion plate 20. The extrusion plate 20 is tightly fitted around the inner wall of the lubrication box 9. The extrusion rod 19 penetrates the outer wall of the lubrication box 9, and the lubrication box 9 penetrates the outer wall of the support plate 2. The end of the extrusion rod 19 is fixedly connected to the outer wall of the sleeve 4. A lubrication pipe 11 is fixedly installed at the bottom of the lubrication box 9. The lubrication pipe 11 penetrates the outer wall of the outer bearing 6, and a one-way discharge valve is fixedly installed inside the lubrication pipe 11. A through groove 14 is provided on the outer wall of the lubrication box 9, and an oil inlet pipe 21 is fixedly connected to the outer wall of the extrusion plate 20. The oil inlet pipe 21 penetrates the outer wall of the lubrication box 9, and the oil inlet pipe 21 penetrates the outer wall of the fixed tower 1. The lubricating mechanism can discharge the lubricating oil through the lubricating pipe 11 to between the inner bearing 12 and the outer bearing 6, and replenish the lubricating oil between the outer bearing 6 and the inner bearing 12, thereby reducing the friction between the inner bearing 12 and the outer bearing 6 during rotation, and at the same time, the heat generated during the rotation process can be quickly discharged, thereby ensuring the service life of the inner bearing 12 and the outer bearing 6, and making the main shaft 5 more stable during the rotation process;

[0032] A locking box 22 is fixedly connected to the inner wall of the fixed tower 1, and a sealing mechanism is slidably connected to the inner wall of the locking box 22. The sealing mechanism includes a piston plate 24 slidably connected to the inner wall of the locking box 22, and the piston plate 24 is tightly fitted around the inner wall of the locking box 22. A piston rod 17 is fixedly connected to the outer side of the piston plate 24, and the piston rod 17 passes through the outer wall of the locking box 22. The piston rod 17 passes through the outer wall of the support plate 2, and the end of the piston rod 17 is fixedly connected to the outer wall of the sleeve 4. An exhaust pipe 10 is fixedly connected to the outer wall of the locking box 22, and the end of the exhaust pipe 10 passes through the sealing block 15. The outer wall of the locking box 22 is provided with a limiting groove 25, a one-way exhaust valve is fixedly installed inside the exhaust pipe 10, an intake pipe 23 is fixedly connected to the outer wall of the locking box 22, the intake pipe 23 runs through the outer wall of the fixed tower 1, and a one-way air intake valve is fixedly installed on the inner wall of the intake pipe 23. The gas can be rushed into the space between the sealing block 15 and the main shaft 5 through the exhaust pipe 10 through the sealing mechanism to form high-pressure gas. The bearing is sealed by the high pressure to avoid leakage of lubricating oil, thereby achieving lubrication and sealing of the main bearing of the wind turbine, thereby reducing the maintenance time of the wind turbine set and reducing a large amount of manpower.

[0033] In the present invention, during long-term use, the lubricating oil disposed between the outer bearing 6 and the inner bearing 12 may leak. The reduction of the lubricating oil will increase the friction resistance between the inner bearing 12 and the outer bearing 6 during the rotation process, and the heat generated by the friction cannot be discharged in time, thereby causing damage to the inner bearing 12, the outer bearing 6 and the main shaft 5.

[0034] The increased friction between the outer bearing 6 and the inner bearing 12 will cause the rotor blades 7 to jam during the rotation process. The jamming of the rotor blades 7 will cause the main shaft 5 to vibrate, thereby causing the sleeve 4 to move downward. During the downward movement of the sleeve 4, the damping rod 3 will move downward and compress the spring 16. The sleeve 4 will cause the extrusion rod 19 to move downward to squeeze the hydraulic oil inside the lubrication box 9. The extrusion rod 19 squeezes the lubricating oil inside the lubrication box 9 through the extrusion plate 20. The lubricating oil is discharged to between the inner bearing 12 and the outer bearing 6 through the lubrication pipe 11, and the lubricating oil between the outer bearing 6 and the inner bearing 12 is supplemented, thereby reducing the friction between the inner bearing 12 and the outer bearing 6 during rotation. At the same time, the heat generated during the rotation process can be quickly discharged, thereby ensuring the service life of the inner bearing 12 and the outer bearing 6, and making the main shaft 5 more stable during the rotation process;

[0035] When the sleeve 4 moves downward, the piston rod 17 will move downward at the same time. When the piston rod 17 moves downward, the gas in the locking box 22 will be squeezed. The gas in the piston plate 24 will move upward through the exhaust pipe 10, so that the gas will be rushed into the space between the sealing block 15 and the main shaft 5 through the exhaust pipe 10 to form high-pressure gas. Since the distance between the sealing teeth 8 and the outer side wall of the main shaft 5 is very close, the lubricating oil can be sealed by the high-pressure gas to prevent the lubricating oil from leaking.

[0036] The elasticity of the spring 16 will cause the sleeve 4 to move upward to reset. At this time, the external lubricating oil is discharged into the lubrication box 9 through the oil inlet pipe 21 to replenish the lubricating oil. The piston plate 24 will also move upward with the piston rod 17, and the external air will be sucked into the locking box 22 through the intake pipe 23. The one-way intake valve installed in the intake pipe 23 can prevent the gas from escaping through the intake pipe 23 during compression. The more lubricating oil leaks between the outer bearing 6 and the inner bearing 12, the more serious the jamming of the main shaft 5 during operation, and the greater the distance the sleeve 4 moves downward. Therefore, the quantitative replenishment of the lubricating oil inside the outer bearing 6 can be achieved, and the sealing block 15 can also be sealed with high pressure.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A main shaft of a horizontal axis wind turbine with built-in vibration damping, comprising a fixed tower (1), characterized in that: A support plate (2) is fixedly connected to the inner wall of the fixed tower (1), a damping rod (3) is fixedly connected to the outer wall of the support plate (2), a sleeve (4) is fixedly connected to the end of the damping rod (3), a main shaft (5) is rotatably connected to the inner wall of the sleeve (4), an inner bearing (12) is fixedly connected to the outer wall of the main shaft (5), an outer bearing (6) is rotatably connected to the outer wall of the inner bearing (12), a sealing block (15) is symmetrically fixedly connected to the outer wall of the outer bearing (6), a lubrication box (9) is fixedly connected to the inner wall of the fixed tower (1), and a lubrication mechanism is slidably connected to the inner wall of the lubrication box (9). A locking box (22) is fixedly connected to the inner wall of the fixed tower (1), a sealing mechanism is slidably connected to the inner wall of the locking box (22), a positioning groove (18) is provided on the outer wall of the fixed tower (1), the main shaft (5) passes through the positioning groove (18), the end of the main shaft (5) is fixedly connected to the rotor blade (7), the outer wall of the damping rod (3) is fixedly connected to a spring (16), the end of the spring (16) is fixedly connected to the outer wall of the sleeve (4), and the outer wall of the outer bearing (6) is symmetrically fixedly connected to a connecting rod (13), the end of the connecting rod (13) is fixedly connected to the outer wall of the sleeve (4); The lubrication mechanism comprises an extrusion plate (20) slidably connected to the inner wall of the lubrication box (9), an extrusion rod (19) is fixedly connected to the outer wall of the extrusion plate (20), the extrusion rod (19) passes through the outer wall of the lubrication box (9), the lubrication box (9) passes through the outer wall of the support plate (2), the end of the extrusion rod (19) is fixedly connected to the outer wall of the sleeve (4), and a lubrication pipe (11) is fixedly installed at the bottom of the lubrication box (9); The sealing mechanism comprises a piston plate (24) slidably connected to the inner wall of the locking box (22), a piston rod (17) being fixedly connected to the outer side of the piston plate (24), the piston rod (17) penetrating the outer side wall of the locking box (22), the piston rod (17) penetrating the outer side wall of the supporting plate (2), the end of the piston rod (17) being fixedly connected to the outer side wall of the sleeve (4), and an exhaust pipe (10) being fixedly connected to the outer side wall of the locking box (22); The lubrication pipe (11) passes through the outer wall of the outer bearing (6); a one-way discharge valve is fixedly installed inside the lubrication pipe (11); a through groove (14) is provided on the outer wall of the lubrication box (9); an oil inlet pipe (21) is fixedly connected to the outer wall of the extrusion plate (20); the oil inlet pipe (21) passes through the outer wall of the lubrication box (9); and the oil inlet pipe (21) passes through the outer wall of the fixed tower (1); The end of the exhaust pipe (10) passes through the outer wall of the sealing block (15), a limiting groove (25) is provided on the outer wall of the locking box (22), and a one-way exhaust valve is fixedly installed inside the exhaust pipe (10).

2. A main shaft of a horizontal axis wind turbine generator set with built-in vibration damping according to claim 1, characterized in that: The spring (16) is wound around the outer wall of the damping rod (3), and the spring (16) is made of spring steel.

3. A main shaft of a horizontal axis wind turbine generator set with built-in vibration damping according to claim 2, characterized in that: Sealing teeth (8) are symmetrically fixedly connected to the outer wall of the sealing block (15), and the sealing teeth (8) are close to but not in contact with the outer wall of the main shaft (5).

4. A main shaft of a horizontal axis wind turbine generator set with built-in vibration damping according to claim 3, characterized in that: The extrusion plate (20) is tightly fitted around the inner side wall of the lubrication box (9).

5. A main shaft of a horizontal axis wind turbine generator set with built-in vibration damping according to claim 4, characterized in that: The piston plate (24) is tightly fitted around the inner side wall of the locking box (22).

6. A main shaft of a horizontal axis wind turbine generator set with built-in vibration damping according to claim 5, characterized in that: An air intake pipe (23) is fixedly connected to the outer wall of the locking box (22), the air intake pipe (23) penetrates the outer wall of the fixed tower (1), and a one-way air intake valve is fixedly installed on the inner wall of the air intake pipe (23).

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