Novel wind driven generator

Abstract

The invention belongs to the technical field of wind power generation equipment, and particularly relates to a novel wind power generator. The invention provides a novel wind driven generator. The novel wind driven generator aims at solving the problems that in the prior art, blades of a wind driven generator are prone to damage and not easy to maintain. A novel wind driven generator comprises a yaw base installed on the ground, a generator is arranged on the yaw base, a bearing ring is arranged on the yaw base, a gear ring is rotationally connected to the bearing ring, blades are arranged on the gear ring, one end of each blade is rotationally connected to the gear ring, and the other end of each blade is rotationally connected to the bearing ring. A variable-pitch device is arranged at the other end of the blade and is used for adjusting the angle of the blade; due to the fact that key components such as the generator and the yaw system are installed on the yaw base on the ground, climbing operation is not needed during maintenance. Therefore, the safety risk of maintenance personnel is greatly reduced, and meanwhile, the maintenance efficiency and convenience are also improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wind power generation equipment, and particularly relates to a novel wind power generator. BACKGROUND

[0002] The wind power generator is a device for converting wind energy into mechanical work and then driving a rotor to generate electricity. In the structure of the conventional wind power generator, the generator and the yaw system are both installed on the tower, and the maintenance requires climbing operation. Meanwhile, since the free end of the blade has no effective support, the strength requirement is more stringent with the increase of the length of the blade. That is, the blade in the prior art is only supported at one end, and the free end is in a free state, and the blade is prone to damage in the long-term use. SUMMARY

[0003] The present application provides a novel wind power generator, which aims to solve the problem that the blade of the wind power generator in the prior art is prone to damage and is not easy to maintain.

[0004] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] A novel wind power generator comprises a yaw base installed on the ground, a generator is arranged on the yaw base, a bearing ring is arranged on the yaw base, a gear ring is rotationally connected to the bearing ring, a blade is arranged on the gear ring, one end of the blade is rotationally connected to the gear ring, and a variable pitch device is arranged at the other end of the blade, the variable pitch device being used for adjusting the angle of the blade.

[0006] The airflow flowing through the blade drives the gear ring through the blade, and the gear ring drives the generator to generate electricity.

[0007] Further improved scheme: the bearing ring and the yaw base are of an integrated structure, the yaw base is provided with a mounting cavity for mounting the generator, the bearing ring is provided with a containing cavity for containing the gear ring, and the containing cavity is communicated with the mounting cavity.

[0008] Based on the above technical scheme: the bearing ring and the yaw base are designed as an integrated structure, which greatly improves the stability of the overall structure. During the operation of the wind power generator, various complex external forces will act on it, such as the impact of wind force and the inertial force of blade rotation. The integrated structure can effectively avoid the structural shaking or displacement caused by loose connection of parts.

[0009] Further improved scheme: the blade is rotationally connected to the gear ring through a rotating shaft, the rotating shaft and the blade are of an integrated structure, the axis of the rotating shaft is arranged along the diameter direction of the gear ring, and the gear ring is provided with an axle hole matched with the rotating shaft.

[0010] Based on the above technical scheme: the shaft and the blade are designed as an integrated structure, which greatly enhances the connection strength between the two. During the operation of the wind turbine, the blade will be subjected to strong wind force, generating various stresses such as bending and torsion. The integrated structure can ensure that these stresses are evenly transmitted between the blade and the shaft, avoiding structural damage caused by loose connection or stress concentration.

[0011] Further improved scheme: the generator is fixed in the installation cavity by bolts, and the generator includes an input shaft, and a gear is arranged on the input shaft and engaged with the ring gear.

[0012] Based on the above technical scheme: when the generator fails or needs to be maintained regularly, this design also provides convenience. Since the generator is fixed in the installation cavity by bolts, maintenance personnel can conveniently remove the bolts and take out the generator from the installation cavity for repair or replacement. At the same time, the gear engagement transmission part is also relatively easy to check and maintain, and maintenance personnel can directly observe the wear and engagement state of the gear, and timely perform cleaning, lubrication or gear replacement operations.

[0013] Further improved scheme: the variable pitch device drives the blade to rotate around the axis of the shaft to adjust the angle of the blade.

[0014] Based on the above technical scheme: the wind size and direction will change over time and environment. When the wind speed is low, the variable pitch device drives the blade to rotate around the shaft, increasing the angle of attack (the angle between the chord line of the blade and the direction of the wind speed). This enables the blade to more effectively "capture" wind energy, increasing the wind force acting on the blade, so that the wind turbine can also start and generate enough torque to drive the generator to generate electricity at low wind speed, improving the power generation efficiency of the wind turbine under low wind speed conditions.

[0015] Further improved scheme: the variable pitch device includes a driving bevel gear, a driven bevel gear is arranged on the blade and engaged with the driving bevel gear, there are three blades, there are three driven bevel gears, the driven bevel gears correspond to the blades one by one, and the three driven bevel gears are engaged with the driving bevel gear.

[0016] Based on the above technical scheme: the bevel gear transmission structure is relatively compact, and the engagement mode of the driving bevel gear and the three driven bevel gears can realize multi-way power transmission in limited space. In the variable pitch system of the wind turbine, the space is usually limited, and this compact structure design can reduce the space occupied by the variable pitch device, making the layout of the entire wind turbine more reasonable.

[0017] Further improved scheme: a worm wheel is arranged on the driving bevel gear, the variable pitch device further includes a worm driven by a variable pitch motor, and the worm is driven by the variable pitch motor.

[0018] Based on the above technical scheme: the worm gear has self-locking property, that is, when the lead angle of the worm is smaller than the equivalent friction angle between the meshing teeth, the mechanism has self-locking property, and only the worm can drive the worm gear, but the worm gear cannot drive the worm. In the variable pitch device, this means that when the variable pitch motor stops driving the worm, the worm wheel cannot rotate by itself, thereby preventing the blade from accidentally rotating under the action of wind force and the like. This self-locking function can ensure that the blade remains stable at a specific angle position, avoiding performance degradation or safety accidents of the wind turbine due to changes in the blade angle.

[0019] Further improved scheme: the driving bevel gear is provided with a connecting shaft, and the worm wheel is mounted on the connecting shaft.

[0020] Based on the above technical scheme: the worm wheel is mounted on the connecting shaft, so that the installation process of the entire variable pitch device is more convenient. During assembly, the worm wheel can be first mounted on the connecting shaft to form a relatively independent sub-assembly, and then the sub-assembly and other components such as the driving bevel gear are assembled. This modular installation method reduces complex operations and debugging work during installation, and improves installation efficiency.

[0021] Further improved scheme: the driven bevel gear is mounted on the blade through a shaft body, and the shaft body is coaxially arranged with the rotating shaft.

[0022] Based on the above technical scheme: the coaxial arrangement of the shaft body and the rotating shaft can ensure that the blade is uniformly stressed during rotation, and reduce vibration and noise caused by axis deviation.

[0023] Further improved scheme: the shaft body is welded to the blade, and the driven bevel gear and the shaft body are in an integrated structure.

[0024] Based on the above technical scheme: the integrated structure ensures the coaxiality and position accuracy between the driven bevel gear and the shaft body. During manufacturing, the geometric size and shape accuracy of the integrated component can be ensured through precise machining process, thereby reducing the transmission inaccuracy problem caused by component machining error and assembly error. High-precision transmission can make the angle adjustment of the blade more accurate, and improve the wind energy capture efficiency and power generation quality of the wind turbine.

[0025] The beneficial effects of the present application are:

[0026] The yaw base is installed on the ground, and the key components such as the generator and the yaw system do not need to be climbed to be maintained, which greatly reduces the safety risk of the maintenance personnel, and improves the efficiency and convenience of the maintenance. For example, the traditional wind turbine maintenance personnel need to climb to the tower to work, which is not only dangerous, but also limited by weather and other factors; and the scheme can conveniently perform various maintenance operations on the ground, reducing the maintenance time and cost.

[0027] The conventional wind turbine blade is only supported at one end, and the free end is in a free state. As the length of the blade increases, the strength requirement is more stringent, and the blade is easily damaged during long-term use. The blade is connected in rotation with the gear ring, which changes the stress mode of the blade to a certain extent. The two ends of the blade are supported, but compared with the conventional structure, the blade is more constrained during rotation, and the stress distribution is more reasonable, thereby reducing the stringent requirement on the strength of the blade and improving the reliability and service life of the blade. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For ordinary skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0029] Fig. 1 is a schematic view of a new type of wind turbine of the present application.

[0030] Fig. 2 is a schematic view of a new type of wind turbine of the present application.

[0031] Fig. 3 is a schematic view of the relative position of the worm gear in a new type of wind turbine of the present application.

[0032] Fig. 4 is a schematic view of the installation position of the generator in a new type of wind turbine of the present application.

[0033] Explanation of reference numerals in the drawings:

[0034] 1 - bearing ring; 2 - gear ring; 3 - blade; 4 - variable pitch device; 411 - worm; 412 - variable pitch motor; 421 - worm gear; 422 - driving bevel gear; 43 - driven bevel gear; 5 - yaw base; 6 - generator. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0036] Reference Figs. 1 to 4 A new type of wind turbine, including the yaw base 5 installed on the ground, the yaw base 5 is provided with the generator, the yaw base 5 is provided with the bearing ring 1, the bearing ring 1 is rotatably connected with the gear ring 2, the gear ring 2 is provided with the blade 3, one end of the blade 3 is rotatably connected with the gear ring 2, the other end of the blade 3 is provided with the variable pitch device 4, the variable pitch device 4 is used for adjusting the angle of the blade 3.

[0037] The airflow flowing through the blade 3 drives the gear ring 2 through the blade 3, and the gear ring 2 drives the generator 6 to generate electricity.

[0038] Wherein: the bearing ring 1 and the yaw base 5 are integrated structure, the yaw base 5 is provided with the installation cavity for installing the generator 6, the bearing ring 1 is provided with the containing cavity for containing the gear ring 2, the containing cavity is communicated with the installation cavity. The blade 3 is rotatably connected to the gear ring 2 through a rotating shaft, the rotating shaft and the blade 3 are integrated structure, the axis of the rotating shaft is arranged along the diameter direction of the gear ring 2, the gear ring 2 is provided with the shaft hole matched with the rotating shaft. The generator 6 is fixed in the installation cavity by bolts, the generator 6 includes an input shaft, the input shaft is provided with a gear engaged with the gear ring 2.

[0039] Specifically: the variable pitch device 4 drives the blade 3 to rotate around the axis of the rotating shaft to adjust the angle of the blade 3. The variable pitch device 4 includes a driving bevel gear 422, the blade 3 is provided with a driven bevel gear 43 engaged with the driving bevel gear 422, the blade 3 has three, the driven bevel gear 43 has three, the driven bevel gear 43 corresponds to the blade 3 one by one, three driven bevel gears 43 are engaged with the driving bevel gear 422. The driving bevel gear 422 is provided with a worm wheel 421, the variable pitch device 4 further includes a worm 411 driving the worm wheel 421, the worm 411 is driven by a variable pitch motor 412. The driving bevel gear 422 is provided with a connecting shaft, the worm wheel 421 is installed on the connecting shaft. The driven bevel gear 43 is installed on the blade 3 through a shaft body, the shaft body is coaxially arranged with the rotating shaft. The shaft body is welded to the blade 3, the driven bevel gear 43 and the shaft body are integrated structure.

[0040] Specifically: the purpose of the present application is to provide a new wind turbine 6, the power generation equipment is installed on the ground, and the strength of the blade 3 can be improved. The wind turbine 6 mainly consists of six parts: bearing ring 1, gear ring 2, blade 3, variable pitch device 4, yaw base 5 and generator 6.

[0041] The blade 3 has three pieces, and the generator 6 is a three-blade 3 configuration. The inner edge of the blade 3 is fixed on the variable pitch device 4, and the outer edge is fixed on the gear ring 2. The gear ring 2 is installed on the yaw base 5 through the bearing ring 1. In normal working condition, the wind drives the blade 3 to rotate in the bearing ring 1 together with the gear ring 2, thereby driving the generator 6 on the yaw base 5 to work. The variable pitch device 4 drives the driving bevel gear 422 through the electric worm 411 and the worm wheel 421, and the driving bevel gear 422 synchronously drives three driven bevel gears. The three driven bevel gears 43 drive the blade 3 to rotate, realizing variable pitch.

[0042] The gear ring 2 is installed on the yaw base 5 through the bearing ring 1. In normal working condition of the wind turbine 6, the wind drives the blade 3 to rotate in the bearing ring 1 together with the gear ring 2, thereby driving the generator 6 on the yaw base 5 to work. The gear ring 2 supports the outer edge of the blade 3, which can effectively improve the stiffness of the blade 3, reduce the deformation of the blade 3, and reduce the strength requirement of the material of the blade 3. The bearing ring 1 and the generator 6 are both installed on the yaw base 5, which is more convenient for daily maintenance and repair.

[0043] The inner edge of the blade 3 is connected to the variable pitch device 4. The variable pitch device 4 controls the deflection angle of the blade 3 according to the wind speed, realizing variable pitch. The variable pitch device 4 drives the worm wheel 421 through the worm 411, and the worm wheel 421 and the driving bevel gear 422 move synchronously and drive three driven bevel gears 43 to rotate. The driven bevel gear 43 is rigidly connected to the blade 3. The driving bevel gear 422 drives the driven bevel gear 43 to rotate synchronously with the blade 3, realizing synchronous variable pitch, to ensure the consistency of the variable pitch angle of the blade 3 and the stability of the operation of the wind turbine 6. The torque of the blade 3 under the action of the wind is sharply reduced after passing through the structure of the worm wheel 421 and the worm 411, forming self-locking, and a brake device does not need to be additionally installed on the variable pitch motor 412. The transmission ratio of the gear ring 2 and the generator 6 is reasonable, which can directly ensure that the generator 6 can run at high speed when the wind turbine 6 is at low speed, without the need to additionally increase a complex gear box to increase the speed.

[0044] The present application installs the power generation equipment on the ground, improves the convenience of maintenance and repair work, and can improve the strength of the blade 3. The present application can be directly applied to areas or terrains with fixed wind direction, including but not limited to valleys and trade wind areas. When the present application is applied to a conventional wind farm, a common yaw system can be installed under the yaw base 5.

[0045] The wind turbine 6 structure provided by the application can effectively improve the rigidity of the blade 3, reduce the deformation of the blade 3, and reduce the strength requirement of the material of the blade 3. Synchronous variable pitch can be realized to ensure the consistency of the variable pitch angle of the blade 3 and the stability of the operation of the wind turbine 6. The power generation equipment is all installed on the yaw base 5 close to the ground, and daily maintenance is more convenient. The variable pitch device 4 can form self-locking, and a brake device does not need to be additionally installed on the variable pitch motor 412. Meanwhile, the transmission ratio of the gear ring 2 and the generator 6 is reasonable, and the generator 6 can be directly driven to operate at a high speed when the wind turbine 6 operates at a low speed, and a complex gear box does not need to be additionally increased to increase the speed.

[0046] The working principle of the embodiment is as follows:

[0047] The yaw base 5 is installed on the ground, and the generator 6 is also arranged on the yaw base 5. The yaw system is used to make the wind wheel of the wind turbine 6 always align with the wind direction to obtain the maximum wind energy capture efficiency. In the traditional structure, the yaw system and the generator 6 are on the tower, and in the new structure, the key components are moved down to the ground, and the overall stress distribution and the installation and maintenance mode are changed.

[0048] The bearing ring 1, the gear ring 2 and the blade 3 are connected: the bearing ring 1 is arranged on the yaw base 5, the gear ring 2 is rotationally connected to the bearing ring 1, and one end of the blade 3 is rotationally connected to the gear ring 2. Such a design makes the rotation of the blade 3 associated with the rotation of the gear ring 2. When the airflow flows through the blade 3, the blade 3 is rotated by the force of the airflow, and the gear ring 2 is further rotated.

[0049] The variable pitch device 4 is arranged at the other end of the blade 3, and the variable pitch device 4 can adjust the angle of the blade 3 according to the wind speed, the wind direction and other conditions. By changing the angle of the blade 3, the size and direction of the wind force acting on the blade 3 can be controlled, so that the performance of the wind turbine 6 is optimized. For example, when the wind speed is too large, the angle of the blade 3 is reduced to reduce the wind force acting on the blade 3, so as to prevent the wind turbine 6 from being damaged due to overload; when the wind speed is small, the angle of the blade 3 is increased to increase the wind energy capture efficiency.

[0050] The airflow flowing through the blade 3 drives the blade 3, the blade 3 drives the gear ring 2 to rotate, and the gear ring 2 drives the generator 6 to generate electricity.

[0051] The application is not limited to the above optional embodiments, and the schemes can be combined arbitrarily on the premise of not being contradictory to each other. Any person can derive other various forms of products under the inspiration of the application, but regardless of any change in shape or structure, any technical scheme falling within the scope defined by the claims of the application falls within the protection scope of the application.

Claims

1. A novel wind turbine generator, characterized in that: Includes a yaw base installed on the ground, a generator is provided on the yaw base, a bearing ring is provided on the yaw base, a gear ring is rotatably connected to the bearing ring, a blade is provided on the gear ring, one end of the blade is rotatably connected to the gear ring, and a pitch controller is provided at the other end of the blade for adjusting the angle of the blade; The airflow passing over the blades drives the gear ring, which in turn drives the generator to generate electricity.

2. The novel wind turbine generator according to claim 1, characterized in that: The bearing ring and the yaw base are an integral structure. The yaw base is provided with a mounting cavity for mounting the generator, and the bearing ring is provided with a receiving cavity for accommodating the gear ring. The receiving cavity communicates with the mounting cavity.

3. A novel wind turbine generator according to claim 2, characterized in that: The blade is rotatably connected to the gear ring via a rotating shaft. The rotating shaft and the blade are an integral structure. The axis of the rotating shaft is set along the diameter direction of the gear ring. The gear ring is provided with a shaft hole that mates with the rotating shaft.

4. A novel wind turbine generator according to claim 3, characterized in that: The generator is fixed to the mounting cavity by bolts. The generator includes an input shaft, on which a gear meshes with the gear ring.

5. A novel wind turbine generator according to claim 4, characterized in that: The pitch controller drives the blades to rotate about the axis of the shaft to adjust the angle of the blades.

6. A novel wind turbine generator according to claim 5, characterized in that: The pitch converter includes a driving bevel gear, and the blades are provided with driven bevel gears that mesh with the driving bevel gear. There are three blades and three driven bevel gears. Each driven bevel gear corresponds to one blade, and all three driven bevel gears mesh with the driving bevel gear.

7. A novel wind turbine generator according to claim 6, characterized in that: The drive bevel gear is provided with a worm gear, and the pitch converter also includes a worm that drives the worm gear, the worm being driven by a pitch motor.

8. A novel wind turbine generator according to claim 7, characterized in that: The driving bevel gear is provided with a connecting shaft, and the worm gear is mounted on the connecting shaft.

9. A novel wind turbine generator according to claim 6, characterized in that: The driven bevel gear is mounted on the blade via a shaft, and the shaft is coaxial with the rotating shaft.

10. A novel wind turbine generator according to claim 9, characterized in that: The shaft is welded to the blade, and the driven bevel gear and the shaft are an integral structure.

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