Wind turbine rotor mechanism and power generation method

Abstract

The present invention provides a wind turbine rotor mechanism and a power generation method. The wind turbine rotor mechanism includes: a two-blade wind blade, including a first blade and a second blade; an impeller main shaft, the first end of which is connected to the generator; a pitch bearing, respectively connected to the two-blade wind blade and the impeller main shaft, including: a bearing inner ring, which is a ring body rigidly connected to the blade roots of the first blade and the second blade at both ends; a bearing outer ring, which is a ring body sleeved on the outer circumference of the bearing inner ring, the outer portion of the bearing outer ring is fixedly connected to the second end of the impeller main shaft; a pitch drive mechanism, which is connected to the bearing outer ring and the bearing inner ring, and can drive the bearing inner ring to rotate around the axis, driving the blades to pitch or retract. The wind turbine rotor mechanism provided by the present invention can simplify the pitch structure, reduce the tooth surface load, improve the wear caused by the load, and reduce the cost of materials, manufacturing, transportation, hoisting, installation and maintenance.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and in particular to a wind turbine rotor mechanism. Background Art

[0002] A wind turbine's pitch system adjusts the angle between the blades and wind direction according to wind speed, controlling the amount of mechanical energy absorbed. This ensures maximum energy capture (corresponding to rated power) while also minimizing wind impact on the wind turbine. When wind speeds are high, the blade angle of attack is reduced through an adjustment mechanism. When wind speeds are low, the blade angle of attack is increased, maintaining a constant rotor speed relative to the wind turbine. This ultimately improves the efficiency and power quality of the entire wind turbine system. As a core component of large wind turbine control systems, the pitch system plays a crucial role in ensuring the safe, stable, and efficient operation of the turbine.

[0003] Currently, the mainstream wind turbine rotor mechanism uses a cast hub shell as the carrier, with two or three independent pitch bearings connecting two or three blades evenly distributed in a rotating plane. Two or three independent pitch mechanisms drive each blade to perform pitch movements to capture wind energy as needed. Problems with this rotor mechanism include:

[0004] 1. Due to the independent pitch control, this structure requires multiple independent pitch drive mechanisms, which are complex and costly.

[0005] 2. Due to the independent pitch control of the mechanism, each drive mechanism and blade pitch tooth surface needs to bear all the loads. However, since the trend of modern wind turbines is to have higher and higher power, the blades are also getting larger and larger, resulting in increasing loads. The drive mechanism and many tooth-driven wind turbines will suffer from tooth surface wear and damage due to excessive and concentrated loads, which seriously affects the normal operation of the wind turbine. The damage to the tooth surface may even cause the entire wind turbine to fail to reach its design life. Summary of the Invention

[0006] The purpose of the present invention is to provide a wind turbine rotor mechanism and power generation method, simplify the variable pitch structure, reduce the tooth surface load, improve the wear caused by the load, and reduce the material, manufacturing, transportation, lifting, installation and maintenance costs.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A wind turbine rotor mechanism, connected to a generator, comprising:

[0009] A two-blade fan blade includes a first blade and a second blade;

[0010] an impeller main shaft, a first end of which is connected to the generator;

[0011] The pitch bearing is connected to the two blades and the impeller main shaft, and includes:

[0012] The bearing inner ring is a ring body whose two ends are rigidly connected to the blade roots of the first blade and the second blade respectively;

[0013] The outer ring of the bearing is a ring body sleeved on the outer circumference of the inner ring of the bearing, and the outer portion of the outer ring of the bearing is fixedly connected to the second end of the impeller main shaft;

[0014] The pitch drive mechanism is connected to the outer ring of the bearing and the inner ring of the bearing, and can drive the inner ring of the bearing to rotate around the axis, thereby driving the two blades to pitch or retract.

[0015] Preferably, after the inner ring of the bearing is connected to the two-blade impeller, the leading edge of the first blade and the trailing edge of the second blade are oriented in the same direction.

[0016] Preferably, the first blade and the second blade are identical.

[0017] Preferably, the pitch drive mechanism comprises a first pitch drive cylinder and a first U-shaped hole;

[0018] Among them, the first U-shaped hole is a through hole opened on the side wall of the bearing inner ring; the first pitch drive cylinder is perpendicular to the axis of the bearing outer ring, its first end is rotatably connected to the bearing outer ring, and its second end is rotatably connected to the bearing inner ring, and the first pitch drive cylinder passes through the inner and outer walls of the bearing inner ring from the first U-shaped hole.

[0019] Preferably, when the first pitch drive cylinder is controlled to be extended or shortened, the second end of the first pitch drive cylinder pulls the inner ring of the bearing to rotate around the axis, driving the two-blade wind blades to pitch or retract.

[0020] Preferably, the pitch drive mechanism includes a second pitch drive cylinder, a third pitch drive cylinder, a pitch drive shaft, a second U-shaped hole and a third U-shaped hole;

[0021] In which, the pitch drive shaft is a ring or cylinder coaxially arranged inside the inner ring of the bearing, and the pitch drive shaft rotates synchronously with the inner ring of the bearing; the second U-shaped hole and the third U-shaped hole are through holes opened on the side wall of the inner ring of the bearing; the second pitch drive cylinder is perpendicular to the axis of the outer ring of the bearing, the first end of the second pitch drive cylinder is rotatably connected to the outer ring of the bearing, and the second end is rotatably connected to the first position of the pitch drive shaft, and the second pitch drive cylinder passes through the inner and outer walls of the inner ring of the bearing from the second U-shaped hole; the third pitch drive cylinder is perpendicular to the axis of the outer ring of the bearing, the first end of the third pitch drive cylinder is rotatably connected to the outer ring of the bearing, and the second end is rotatably connected to the second position of the pitch drive shaft, and the third pitch drive cylinder passes through the inner and outer walls of the inner ring of the bearing from the third U-shaped hole.

[0022] Preferably, the first position and the second position of the pitch drive shaft are symmetrically distributed relative to the axis of the pitch drive shaft.

[0023] Preferably, when the second pitch drive cylinder is controlled to lengthen or shorten, and the third pitch drive cylinder is synchronously controlled to move in the opposite direction, the second ends of the second pitch drive cylinder and the third pitch drive cylinder jointly pull the inner ring of the bearing to rotate around the axis, driving the two-blade wind blades to pitch or retract.

[0024] Preferably, the pitch drive mechanism includes a fourth pitch drive cylinder, a fifth pitch drive cylinder, a mechanical connecting rod and a fourth U-shaped hole;

[0025] Among them, the first end of the mechanical connecting rod is rotatably connected to the outer ring of the bearing; the fourth U-shaped hole is a through hole opened on the side wall of the inner ring of the bearing; the fourth pitch drive cylinder, the mechanical connecting rod and the fifth pitch drive cylinder are all perpendicular to the axis of the outer ring of the bearing, the first end of the fourth pitch drive cylinder is rotatably connected to the outer ring of the bearing, and the second end is rotatably connected to the second end of the mechanical connecting rod; the first end of the fifth pitch drive cylinder is rotatably connected to the second end of the mechanical connecting rod, and the second end is rotatably connected to the inner ring of the bearing, and the fourth pitch drive cylinder, the fifth pitch drive cylinder and the mechanical connecting rod pass through the inner and outer walls of the inner ring of the bearing from the fourth U-shaped hole.

[0026] Preferably, when the fourth pitch drive cylinder is controlled to lengthen or shorten, and the fifth pitch drive cylinder is synchronously controlled to move in the opposite direction, the fourth pitch drive cylinder, the fifth pitch drive cylinder and the mechanical connecting rod jointly pull the inner ring of the bearing to rotate around the axis, driving the two-blade wind blades to pitch or retract.

[0027] Preferably, the pitch drive mechanism includes a pitch drive gear, a bearing inner ring gear, a pitch drive motor and a fifth U-shaped hole;

[0028] Among them, the bearing inner ring teeth are racks fixedly arranged around the inner wall of the bearing inner ring; the pitch drive motor is fixedly connected to the bearing outer ring; the fifth U-shaped hole is a through hole opened on the side wall of the bearing inner ring, and the output shaft of the pitch drive motor passes through the inner and outer walls of the bearing inner ring from the fifth U-shaped hole; the pitch drive gear is connected to the output shaft of the pitch drive motor and engages with the bearing inner ring teeth, which can drive the bearing inner ring to rotate around the axis.

[0029] Preferably, when the pitch drive motor is controlled to drive the pitch drive gear to rotate forward or reverse, the inner ring teeth of the bearing drive the inner ring of the bearing to rotate around the axis, thereby driving the two-blade wind blades to pitch or retract.

[0030] Preferably, the first blade, the second blade and the inner ring of the pitch bearing are an integral structure, and the outer ring of the bearing and the pitch drive mechanism are detachable structures.

[0031] Preferably, at the installation site, the integrated structure of the first blade, the second blade and the bearing inner ring of the pitch bearing are first assembled with the pitch drive mechanism and the bearing outer ring, and then the assembled components are fixed to the impeller main shaft.

[0032] Preferably, the first blade, the second blade and the pitch bearing are an integrated structure.

[0033] Preferably, the integrated structure of the first blade, the second blade and the pitch bearing is fixed to the impeller main shaft at the installation site.

[0034] A method for generating electricity by a wind turbine is implemented based on the above-mentioned wind turbine rotor mechanism. Under the drive of wind, the two-blade wind blades drive the impeller main shaft to rotate around the axis through the variable pitch bearing, thereby driving the generator to generate electricity; and according to needs, the two-blade wind blades can be driven to change pitch or retract pitch through the variable pitch bearing to meet power generation requirements.

[0035] In summary, compared with the prior art, the wind turbine rotor mechanism and power generation method provided by the present invention have the following beneficial effects:

[0036] 1. By installing both blades on the same bearing, only one set of pitch bearings and drive mechanisms is required, which greatly reduces material costs, manufacturing costs, as well as transportation, lifting and installation costs;

[0037] 2. By connecting the two blades with a rigid body and distributing them symmetrically around the center, when the pitch is changed, the torque generated by the wind acting on the two blades will cancel each other out and will not be transmitted to the drive mechanism and the drive tooth surface. In theory, the drive mechanism only needs to overcome the friction of the bearing to drive the pitch action. The pitch action will not be affected by the wind load, which greatly reduces the force on the drive mechanism and greatly simplifies the drive mechanism, while reducing tooth surface wear and damage. In addition, the inner ring of the pitch bearing has a larger size space when designed, which can be simpler. Due to the balanced force, the load-bearing capacity can also be reduced.

[0038] 3. Appropriate modifications can also be made to the wind turbines in use to reduce the tooth surface load, reduce the force on the drive mechanism and pitch tooth surface, and improve the wear caused by the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of the wind turbine rotor mechanism of the present invention;

[0040] Figure 2a is a side view of one embodiment of a pitch bearing of the present invention;

[0041] Figure 2b is a top view of one embodiment of a pitch bearing of the present invention;

[0042] Figure 3a is a side view of one embodiment of a pitch bearing of the present invention;

[0043] Figure 3b is a top view of one embodiment of a pitch bearing of the present invention;

[0044] Figure 4a is a side view of one embodiment of a pitch bearing of the present invention;

[0045] Figure 4b is a top view of one embodiment of a pitch bearing of the present invention;

[0046] Figure 5a is a side view of one embodiment of a pitch bearing of the present invention;

[0047] Figure 5b It is a top view of one embodiment of the pitch bearing of the present invention. DETAILED DESCRIPTION

[0048] The following is a further detailed description of a wind turbine rotor mechanism and a power generation method proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer based on the following description. It should be noted that the drawings are in a very simplified form and are not in precise proportions. They are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0049] It should be noted that, in the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only the elements explicitly listed, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0050] In this field, the blade direction is usually defined as the span direction and the chord direction. The span direction is the direction along the length of the blade, and the span ends of the blade are the root and the tip respectively; the chord direction is the direction along the width of the blade, and the chord ends of the blade are the leading edge and the trailing edge respectively.

[0051] As attached Figure 1 As shown, this embodiment provides a wind turbine rotor mechanism, which is connected to a generator 4 and rotates under the action of wind to drive the generator 4 to generate electricity, and includes:

[0052] A two-blade fan blade includes only a first blade 21 and a second blade 22 that are identical;

[0053] The impeller main shaft 3 has a first end connected to the generator 4, and when the impeller main shaft 3 rotates around its own axis, it drives the generator 4 to generate electricity;

[0054] A pitch bearing 1 is provided between the two-blade fan blades and the impeller main shaft 3, and is used to transmit the power of the two-blade fan blades rotating around the axis of the impeller main shaft 3 to the impeller main shaft 3, and drive the two-blade fan blades to change pitch or retract. As shown in Figures 2 to 5, the pitch bearing 1 includes:

[0055] The bearing inner ring 11 is a ring body with its axial ends rigidly connected to the blade roots of the first blade 21 and the second blade 22, respectively. After the connection, the leading edge of the first blade 21 and the trailing edge of the second blade 22 are aligned, and the trailing edge of the first blade 21 and the leading edge of the second blade 22 are aligned.

[0056] The bearing outer ring 12 is a ring coaxially mounted on the outer periphery of the bearing inner ring 11. The outer portion of the bearing outer ring 12 is fixedly connected to the second end of the impeller main shaft 3. Driven by the two blades, the bearing outer ring 12 can drive the impeller main shaft 3 to rotate around the axis of the impeller main shaft 3, thereby driving the generator 4 to generate electricity.

[0057] The pitch drive mechanism is connected to the bearing inner ring 11 and the bearing outer ring 12, and is used to drive the bearing inner ring 11 to rotate around its own axis by a certain angle. During the rotation, the first blade 21 and the second blade 22 are synchronously driven to rotate around the axis of the bearing inner ring 11 in the forward or reverse direction by a certain angle, so that the angle between the blade itself and the blade rotating surface is changed, thereby completing the pitch or paddle action (paddle retraction refers to the process of reversely adjusting the angle between the blade itself and the blade rotating surface to return to the blade zero position); the pitch drive mechanism can adopt various forms, among which:

[0058] Attachment Figure 2a 、 2b The first embodiment of the pitch drive mechanism is shown, which includes a first pitch drive cylinder A1 and a first U-shaped hole A2; the pitch drive cylinders described in the present invention are all electrically controlled cylinders, having a first end and a second end, and the distance between the first end and the second end can be controlled to adjust within a certain range; wherein, the first U-shaped hole A2 is a through hole opened on the side wall of the bearing inner ring 11; the first pitch drive cylinder A1 is perpendicular to the axis of the bearing outer ring 12, and its first end is rotatably connected to the bearing outer ring 12, and its second end is rotatably connected to the bearing inner ring 11; the first pitch drive cylinder A1 The portion of the rod between the first end and the second end passes through the inner and outer walls of the bearing inner ring 11 from the first U-shaped hole A2, and the size of the first U-shaped hole A2 meets the needs of pitch change or slurry retraction of the two-blade wind blades; the pitch change and slurry retraction principle is as follows: since the bearing outer ring 12 is restricted by the impeller main shaft 3 and the generator 4 and cannot rotate around its own axis, the first end of the first pitch drive cylinder A1 is fixed relative to the axis of the bearing inner ring 11. When the first pitch drive cylinder A1 is controlled to be extended or shortened, the second end of the first pitch drive cylinder A1 pulls the bearing inner ring 11 to rotate around its own axis, driving the two-blade wind blades to pitch or retract;

[0059] Attachment Figure 3a 、 3bThe figure shows a second embodiment of the pitch drive mechanism, which includes a second pitch drive cylinder B1, a third pitch drive cylinder B2, a pitch drive shaft B3, a second U-shaped hole B4 and a third U-shaped hole B5; wherein the pitch drive shaft B3 is a ring or cylinder coaxially arranged inside the bearing inner ring 11, and the pitch drive shaft B3 and the bearing inner ring 11 are synchronously rotated by a connector or other means; the second U-shaped hole B4 and the third U-shaped hole B5 are through holes opened on the side wall of the bearing inner ring 11; the second pitch drive cylinder B1 is perpendicular to the axis of the bearing outer ring 12, and the second pitch drive cylinder B1 is perpendicular to the axis of the bearing outer ring 12. The first end of the movable oil cylinder B1 is rotatably connected to the outer ring 12 of the bearing, and the second end is rotatably connected to the first position of the pitch drive shaft B3. Part of the rod between the first end and the second end of the second pitch drive oil cylinder B1 passes through the inner and outer walls of the bearing inner ring 11 from the second U-shaped hole B4, and the size of the second U-shaped hole B4 meets the needs of pitching or retracting the two-blade wind blades; the third pitch drive oil cylinder B2 is perpendicular to the axis of the bearing outer ring 12, the first end of the third pitch drive oil cylinder B2 is rotatably connected to the outer ring 12 of the bearing, and the second end is rotatably connected to the second position of the pitch drive shaft B3. The first end of the third pitch drive oil cylinder B2 The portion of the rod body between the second end and the second end passes through the inner and outer walls of the bearing inner ring 11 from the third U-shaped hole B5, and the size of the third U-shaped hole B5 meets the needs of pitching or retracting the two-blade wind blades; in this embodiment, the positions of the second U-shaped hole B4 and the third U-shaped hole B5 are adjacent, but in other embodiments, the positions of the second U-shaped hole B4 and the third U-shaped hole B5 are not limited, as long as the needs of pitching and retracting are met; preferably, in some embodiments, the first position and the second position of the pitch drive shaft B3 are roughly symmetrically distributed relative to the axis of the pitch drive shaft B3, so that the force on the pitch drive shaft B3 is more uniform and not easy to Damage; the principle of pitch and slurry collection is as follows: since the outer ring 12 of the bearing is restricted by the impeller main shaft 3 and the generator 4 and cannot rotate around its own axis, the first ends of the second pitch drive cylinder B1 and the third pitch drive cylinder B2 are fixed relative to the axis of the bearing inner ring 11. When the second pitch drive cylinder B1 is controlled to lengthen or shorten, and the third pitch drive cylinder B2 is synchronously controlled to move in the opposite direction, the second ends of the second pitch drive cylinder B1 and the third pitch drive cylinder B2 jointly pull the pitch drive shaft B3 and synchronously drive the bearing inner ring 11 to rotate around its own axis, driving the two-blade wind blades to pitch or slurry collection;

[0060] Attachment Figure 4a 、 4bThe third embodiment of the pitch drive mechanism is shown, which includes a fourth pitch drive cylinder C1, a fifth pitch drive cylinder C2, a mechanical connecting rod C3 and a fourth U-shaped hole C4; wherein, the first end of the mechanical connecting rod C3 is rotatably connected to the bearing outer ring 12; the fourth U-shaped hole C4 is a through hole opened on the side wall of the bearing inner ring 11; the fourth pitch drive cylinder C1, the mechanical connecting rod C3 and the fifth pitch drive cylinder C2 are all perpendicular to the axis of the bearing outer ring 12, the first end of the fourth pitch drive cylinder C1 is rotatably connected to the bearing outer ring 12, and the second end is rotatably connected to the second end of the mechanical connecting rod C3; the first end of the fifth pitch drive cylinder C2 is rotatably connected to the second end of the mechanical connecting rod C3, and the second end is rotatably connected to the bearing inner ring 11. The cylinder C1, the fifth pitch drive cylinder C2 and part of the rod body of the mechanical connecting rod C3 pass through the inner and outer walls of the bearing inner ring 11 from the fourth U-shaped hole C4, and the size of the fourth U-shaped hole C4 meets the needs of pitching or retracting the two-blade wind blades; the pitching and retracting principles are as follows: since the bearing outer ring 12 is restricted by the impeller main shaft 3 and the generator 4 and cannot rotate around its own axis, the first end of the fourth pitch drive cylinder C1 is fixed relative to the axis of the bearing inner ring 11. When the fourth pitch drive cylinder C1 is controlled to be lengthened or shortened, and the fifth pitch drive cylinder C2 is synchronously controlled to move in the opposite direction, the fourth pitch drive cylinder C1 and the fifth pitch drive cylinder C2, through the linkage with the mechanical connecting rod C3, jointly pull the bearing inner ring 11 to rotate around its own axis, thereby driving the two-blade wind blades to pitch or retract;

[0061] Attachment Figure 5a 、 5b The fourth embodiment of the pitch drive mechanism is shown, which includes a pitch drive gear D1, a bearing inner ring gear D2, a pitch drive motor D3 and a fifth U-shaped hole D4; wherein the bearing inner ring gear D2 is a rack fixedly arranged around the inner wall of the bearing inner ring 11, which can be a closed ring body or not closed. When not closed, its length meets the needs of pitching or retracting the two-blade wind blade; the pitch drive motor D3 is fixedly connected to the bearing outer ring 12; the fifth U-shaped hole D4 is a through hole opened on the side wall of the bearing inner ring 11, and the output shaft of the pitch drive motor D3 passes through the inner and outer walls of the bearing inner ring 11 from the fifth U-shaped hole D4; the pitch drive The moving gear D1 is connected to the output shaft of the pitch drive motor D3 and meshes with the bearing inner ring gear D2. It can drive the bearing inner ring gear D2 and the bearing inner ring 11 to rotate around the axis through gear matching; the pitch and shearing principle is as follows: since the bearing outer ring 12 is restricted by the impeller main shaft 3 and the generator 4 and cannot rotate around its own axis, the pitch drive gear D1 connected to the pitch drive motor D3 is fixed relative to the axis of the bearing inner ring 11. When the pitch drive motor D3 is controlled to drive the pitch drive gear D1 to rotate forward or reverse, the bearing inner ring gear D2 drives the bearing inner ring 11 to rotate around the axis, thereby driving the two-blade wind blades to pitch or shear.

[0062] In some embodiments, the first blade 21 , the second blade 22 and the pitch bearing 1 are not integral structures, and the components are assembled at the installation site.

[0063] In some embodiments, the bearing outer ring 12 and the pitch drive mechanism are detachable structures, and the first blade 21, the second blade 22 and the bearing inner ring 11 of the pitch bearing 1 are an integrated structure. At the installation site, the integrated structure is first assembled with the pitch drive mechanism and the bearing outer ring 12, and then the assembled components are fixed to the impeller main shaft 3.

[0064] In some embodiments, the first blade 21 , the second blade 22 and the pitch bearing 1 are an integrated structure, and the integrated structure is assembled with the impeller main shaft 3 at the installation site.

[0065] The power generation principle of the wind turbine rotor mechanism of this embodiment is: the two-blade wind blades rotate under the action of wind, driving the variable pitch bearing 1 and the impeller main shaft 3 to rotate around the axis of the impeller main shaft 3, thereby driving the generator 4 to generate electricity and convert mechanical energy into electrical energy.

[0066] In summary, the wind turbine rotor mechanism and power generation method provided by the present invention, by installing two blades on the same bearing, only requires one set of pitch bearings and pitch drive mechanisms, and its material cost, manufacturing cost, as well as transportation, lifting and installation costs are greatly reduced; by connecting the two blades in the middle with a rigid body and distributing them symmetrically around the center, when performing a pitch action, the torque generated by the wind acting on the two blades will cancel each other out and will not be transmitted to the drive mechanism and the drive tooth surface. In theory, the drive mechanism only needs to overcome the friction of the bearing to drive the pitch action, and the pitch action will not be affected by the wind load, greatly reducing the force on the drive mechanism, greatly simplifying the drive mechanism, and reducing tooth surface wear and damage; moreover, the inner ring of the pitch bearing is designed with a larger size space, which can be designed more simply. Due to the force balance, the load-bearing capacity can also be reduced; the wind turbine in use can also be appropriately modified to reduce the tooth surface load, reduce the force on the drive mechanism and the pitch tooth surface, and improve the wear caused by the load.

[0067] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A wind turbine rotor mechanism connected to a generator, characterized in that: include: A two-blade fan blade comprises a first blade and a second blade; the first blade and the second blade are identical; an impeller main shaft, a first end of which is connected to the generator; The pitch bearing is connected to the two blades and the impeller main shaft, and includes: The bearing inner ring is a ring body whose two ends are rigidly connected to the blade roots of the first blade and the second blade respectively; After the inner ring of the bearing is connected to the two-blade fan blade, the leading edge of the first blade and the trailing edge of the second blade are aligned in the same direction; The outer ring of the bearing is a ring body sleeved on the outer circumference of the inner ring of the bearing, and the outer portion of the outer ring of the bearing is fixedly connected to the second end of the impeller main shaft; The pitch drive mechanism is connected to the outer ring of the bearing and the inner ring of the bearing, and can drive the inner ring of the bearing to rotate around the axis, thereby driving the two-blade wind blades to pitch or retract.

2. The wind turbine rotor mechanism according to claim 1, wherein: The pitch drive mechanism includes a first pitch drive cylinder and a first U-shaped hole; Among them, the first U-shaped hole is a through hole opened on the side wall of the bearing inner ring; the first pitch drive cylinder is perpendicular to the axis of the bearing outer ring, its first end is rotatably connected to the bearing outer ring, and its second end is rotatably connected to the bearing inner ring, and the first pitch drive cylinder passes through the inner and outer walls of the bearing inner ring from the first U-shaped hole.

3. The wind turbine rotor mechanism according to claim 2, wherein: When the first pitch drive cylinder is controlled to be extended or shortened, the second end of the first pitch drive cylinder pulls the inner ring of the bearing to rotate around the axis, driving the two-blade wind blades to change pitch or retract pitch.

4. The wind turbine rotor mechanism according to claim 1, wherein: The pitch drive mechanism includes a second pitch drive cylinder, a third pitch drive cylinder, a pitch drive shaft, a second U-shaped hole and a third U-shaped hole; In which, the pitch drive shaft is a ring or cylinder coaxially arranged inside the inner ring of the bearing, and the pitch drive shaft rotates synchronously with the inner ring of the bearing; the second U-shaped hole and the third U-shaped hole are through holes opened on the side wall of the inner ring of the bearing; the second pitch drive cylinder is perpendicular to the axis of the outer ring of the bearing, the first end of the second pitch drive cylinder is rotatably connected to the outer ring of the bearing, and the second end is rotatably connected to the first position of the pitch drive shaft, and the second pitch drive cylinder passes through the inner and outer walls of the inner ring of the bearing from the second U-shaped hole; the third pitch drive cylinder is perpendicular to the axis of the outer ring of the bearing, the first end of the third pitch drive cylinder is rotatably connected to the outer ring of the bearing, and the second end is rotatably connected to the second position of the pitch drive shaft, and the third pitch drive cylinder passes through the inner and outer walls of the inner ring of the bearing from the third U-shaped hole.

5. The wind turbine rotor mechanism according to claim 4, wherein: The first position and the second position of the pitch drive shaft are symmetrically distributed relative to the axis of the pitch drive shaft.

6. The wind turbine rotor mechanism according to claim 4 or 5, characterized in that: When the second pitch drive cylinder is controlled to extend or shorten, and the third pitch drive cylinder is synchronously controlled to move in the opposite direction, the second ends of the second pitch drive cylinder and the third pitch drive cylinder jointly pull the inner ring of the bearing to rotate around the axis, driving the two-blade wind blades to pitch or retract.

7. The wind turbine rotor mechanism according to claim 1, wherein: The pitch drive mechanism includes a fourth pitch drive cylinder, a fifth pitch drive cylinder, a mechanical connecting rod and a fourth U-shaped hole; Among them, the first end of the mechanical connecting rod is rotatably connected to the outer ring of the bearing; the fourth U-shaped hole is a through hole opened on the side wall of the inner ring of the bearing; the fourth pitch drive cylinder, the mechanical connecting rod and the fifth pitch drive cylinder are all perpendicular to the axis of the outer ring of the bearing, the first end of the fourth pitch drive cylinder is rotatably connected to the outer ring of the bearing, and the second end is rotatably connected to the second end of the mechanical connecting rod; the first end of the fifth pitch drive cylinder is rotatably connected to the second end of the mechanical connecting rod, and the second end is rotatably connected to the inner ring of the bearing, and the fourth pitch drive cylinder, the fifth pitch drive cylinder and the mechanical connecting rod pass through the inner and outer walls of the inner ring of the bearing from the fourth U-shaped hole.

8. The wind turbine rotor mechanism according to claim 7, wherein: When the fourth pitch drive cylinder is controlled to lengthen or shorten, and the fifth pitch drive cylinder is synchronously controlled to move in the opposite direction, the fourth pitch drive cylinder, the fifth pitch drive cylinder and the mechanical connecting rod jointly pull the inner ring of the bearing to rotate around the axis, driving the two-blade wind blades to pitch or retract.

9. The wind turbine rotor mechanism according to claim 1, wherein: The pitch drive mechanism includes a pitch drive gear, a bearing inner ring gear, a pitch drive motor and a fifth U-shaped hole; Among them, the bearing inner ring teeth are racks fixedly arranged around the inner wall of the bearing inner ring; the pitch drive motor is fixedly connected to the bearing outer ring; the fifth U-shaped hole is a through hole opened on the side wall of the bearing inner ring, and the output shaft of the pitch drive motor passes through the inner and outer walls of the bearing inner ring from the fifth U-shaped hole; the pitch drive gear is connected to the output shaft of the pitch drive motor and engages with the bearing inner ring teeth, which can drive the bearing inner ring to rotate around the axis.

10. The wind turbine rotor mechanism according to claim 9, wherein: When the pitch drive motor is controlled to drive the pitch drive gear to rotate forward or reverse, the inner ring teeth of the bearing drive the inner ring of the bearing to rotate around the axis, thereby driving the two-blade wind blades to pitch or retract.

11. The wind turbine rotor mechanism according to claim 1, wherein: The first blade, the second blade and the inner ring of the pitch bearing are an integrated structure, and the outer ring of the bearing and the pitch drive mechanism are detachable structures.

12. The wind turbine rotor mechanism according to claim 11, wherein: At the installation site, the integrated structure of the first blade, the second blade and the bearing inner ring of the pitch bearing is first assembled with the pitch drive mechanism and the bearing outer ring, and then the assembled components are fixed to the impeller main shaft.

13. The wind turbine rotor mechanism according to claim 1, wherein: The first blade, the second blade and the pitch bearing are an integrated structure.

14. The wind turbine rotor mechanism according to claim 13, wherein: At the installation site, the integrated structure of the first blade, the second blade and the pitch bearing is fixed to the impeller main shaft.

15. A method for generating electricity using a wind turbine, characterized in that: Based on the wind turbine rotor mechanism as described in any one of claims 1 to 14, the two-blade wind blades are driven by wind to drive the impeller main shaft to rotate around the axis through the variable pitch bearing, thereby driving the generator to generate electricity; and the two-blade wind blades are driven to pitch or retract through the variable pitch bearing to meet the power generation requirements.

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