Wind power generation device capable of changing pitch synchronously by one machine

Abstract

The invention discloses a one-machine synchronous variable pitch wind power generation device which comprises a tower, a cabin arranged on the tower, a power generation assembly arranged in the cabin, a hub arranged on the power generation assembly and a plurality of fan blades arranged on the hub. A variable-pitch bearing is arranged in the hub, the variable-pitch bearing is divided into an inner shaft ring and an outer shaft ring, the inner shaft ring is fixed on the hub, a driven rack section is fixed on the outer shaft ring corresponding to each fan blade, a variable-pitch driven adjusting piece is fixed on each fan blade, and a variable-pitch driven adjusting piece is fixed on the outer shaft ring. The variable-pitch driven adjusting piece is provided with teeth meshed with the driven rack section, and a variable-pitch power assembly is fixed in the hub and connected with the inner shaft ring. The device is based on the aerodynamic principle, an efficient wind wheel fan blade optimization design scheme is adopted, the wind energy capturing efficiency is improved, and stable power generation in different wind speed environments is achieved.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and particularly to a wind power generation device with one-machine synchronous pitch control. Background Art

[0002] Wind power generation equipment aims to convert wind energy resources into electrical energy to provide clean and renewable energy for the power grid. Wind power generation equipment can be divided into two categories: horizontal axis and vertical axis. The traditional mainstream model is represented by horizontal axis wind power generation equipment (hereinafter referred to as: three-blade wind turbines), which usually installs three flat, conical and very narrow blades on the hub to obtain wind energy. However, the design of this three-blade geometry and the number of blades do not conform to the principles of aerodynamics and go against bionics (reference can be made to the wings and fins of birds, insects and fish), resulting in serious torque loss in the blade body, low wind energy utilization rate, and a large amount of wind is required to start and operate. As the name implies, wind power generation relies on the wind turbine blades to passively obtain wind energy, and the shape and number of the blades play a key role. When the blades rotate against the wind, the axial velocity of the points farther from the axis is higher. According to the circular motion characteristics of the wind turbine during rotation, it can be said that the shape of the blade should be narrower closer to the axis and wider farther from the axis, that is, the width of each point of the blade and the twist of the blade should match the axial rotation speed of this point.

[0003] The level of wind energy utilization depends on the shape, number of the blades, and the effect of the wind on the angle of attack of the blades. It can be seen that there are misunderstandings in the blade design of three-blade wind turbines. Undoubtedly, compared with narrow blades, wide blades generate greater resistance during rotation. However, at the same time, the wind pressure on the windward side of wide blades is also greater than that of narrow blades. The wind turbine rotates because the positive pressure on the blade is greater than the resistance on the blade during the rotation of the wind turbine, and both the pressure and the resistance follow the physics formula that pressure equals pressure multiplied by the pressure-receiving area, that is, F = P * S (F refers to the pressure on the blade; P refers to the pressure per unit area on the blade; S refers to the effective pressure-receiving area of the blade). Because the wind pressure remains unchanged under the same conditions, the force on the blade is related to the effective pressure-receiving area of the blade. Therefore, it can be seen that under the same conditions, a wide-blade wind turbine is more likely to accept and absorb wind energy than a narrow-blade wind turbine, the wind turbine obtains more energy, and the wind turbine is more likely to rotate. Similarly, under the same conditions, the wind energy obtained by wind turbines with different numbers of blades will also be different. The shape and number of the blades should be designed within a reasonable range. Moreover, the pitch control system of three-blade wind turbines usually includes three independent drive motors, and each motor controls the pitch operation of one blade respectively, which will undoubtedly increase the manufacturing cost. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] For this reason, the object of the present invention is to provide a wind power generation device with one-machine synchronous pitch control, which is efficient, low-cost and relatively reasonable in design, can effectively improve the wind energy capture efficiency, and realizes stable power generation in different wind speed environments.

[0006] To achieve the above object, the technical solution of the present invention provides a wind power generation device with one-machine synchronous pitch control, including a tower, a nacelle installed on the tower, a power generation assembly installed in the nacelle, a hub installed on the power generation assembly, and a plurality of blades installed on the hub. The power generation assembly is connected to the hub. A pitch bearing is installed in the hub. The pitch bearing is divided into an inner race and an outer race. The inner race is fixed to the hub, and a passive rack segment is fixed to the outer race at a position corresponding to each blade. A pitch passive adjusting member is fixed to each blade, and the pitch passive adjusting member has teeth meshing with the passive rack segment. A pitch power assembly is fixed in the hub, and the pitch power assembly is connected to the inner race.

[0007] In the above technical solution, preferably, the pitch power assembly includes a pitch motor and a pitch active adjusting member installed on the pitch motor. The pitch active adjusting member is connected to the inner race.

[0008] In the above technical solution, preferably, the pitch active adjusting member meshes with any one of the passive rack segments.

[0009] In the above technical solution, preferably, an active rack segment is fixed between any two of the passive rack segments, and the active rack segment meshes with the pitch active adjusting member.

[0010] In any of the above technical solutions, preferably, each blade includes a bushing, a blade, and a blade shaft at the bottom of the blade. The bushing is fixed to the hub and is fixed with the pitch passive adjusting member, and the blade shaft is fixedly connected to the bushing.

[0011] In any of the above technical solutions, preferably, a wind sensor is installed on the top of the nacelle, a wind aligning mechanism is installed on the tower, the nacelle is installed on the wind aligning mechanism, and a wind aligning motor is installed in the nacelle. The wind aligning motor is connected to the wind aligning mechanism.

[0012] In any of the above technical solutions, preferably, the power generation assembly includes a generator fixed in the nacelle and a main shaft installed on the generator. The main shaft is fixedly connected to the hub.

[0013] In the above technical solution, preferably, the power generation assembly further includes a gearbox and a braking mechanism connected to the gearbox. The gearbox has a power input shaft, and the braking mechanism has a power output shaft. The power input shaft is fixedly connected to the main shaft, and the power output shaft is fixedly connected to the generator.

[0014] In the above technical solution, preferably, a bearing seat is installed in the nacelle, and the main shaft is installed on the bearing seat.

[0015] In the above technical solution, preferably, a control system is installed in the nacelle. The control system is electrically connected to the power generation assembly, the pitch power assembly, the wind-facing motor, and the wind sensor respectively.

[0016] Compared with the prior art, the advantages of the wind power generation device with one-machine synchronous pitch provided by the present invention are as follows: Six wide blades are provided on this wind power generation device as a wind energy capture device. Their shapes and materials are carefully designed to maximize the wind energy capture efficiency. The design of the wide blades based on the principle of aerodynamics can more effectively utilize and capture wind power. The present invention adopts the one-machine synchronous pitch technology, that is, one motor controls and operates the six blades to synchronously change the pitch angle in a linkage manner. This control process is completed by the control system. The system real-time monitors environmental parameters such as wind speed and wind direction through the wind sensor, and adjusts the pitch angle of the blades accordingly to optimize the wind energy capture efficiency and the output power of the generator, so as to more effectively drive the generator to convert wind energy into electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0018] Figure 1 Shows the front view of the wind power generation device involved in the embodiment of the present invention;

[0019] Figure 2 Shows the side view of the wind power generation device involved in the embodiment of the present invention;

[0020] Figure 3 Shows the structural diagram of the power generation assembly in the nacelle of the wind power generation device involved in the embodiment of the present invention;

[0021] Figure 4 Shows the principle structural diagram of the one-machine synchronous pitch of the wind power generation device involved in Embodiment 1 of the present invention;

[0022] Figure 5 Shows the principle structural diagram of the one-machine synchronous pitch of the wind power generation device involved in Embodiment 2 of the present invention;

[0023] Wherein,Figures 1 to 5 The corresponding relationship between the reference numerals in the drawings and the component names is as follows:

[0024] 1. Tower; 2. nacelle; 3. hub; 4. inner race; 5. outer race; 6. passive rack section; 7. pitch passive adjustment member; 8. pitch motor; 9. pitch active adjustment member; 10. active rack section; 11. bushing; 12. blade shaft; 13. wind sensor; 14. wind alignment mechanism; 15. wind alignment motor; 16. generator; 17. main shaft; 18. gearbox; 19. braking mechanism; 20. power input shaft; 21. power output shaft; 22. bearing housing; 23. control system; 24. blade; 25. fairing. Detailed implementation manners

[0025] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0026] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the limitations of the specific embodiments disclosed below.

[0027] As Figures 1 to 5 shown, a wind power generation device with one - machine synchronous pitch according to an embodiment of the present invention includes a tower 1, a nacelle 2 installed on the tower 1, a power generation assembly installed in the nacelle 2, a hub 3 installed on the power generation assembly, and a plurality of wind blades installed on the hub 3. The power generation assembly is connected to the hub 3. A fairing 25 is provided at the front of the hub 3. A pitch bearing is installed in the hub 3. The pitch bearing is divided into an inner race 4 and an outer race 5. The inner race 4 is fixed to the hub 3. A passive rack section 6 is fixed to the outer race 5 corresponding to each wind blade. A pitch passive adjustment member 7 is fixed to each wind blade. The pitch passive adjustment member 7 has teeth meshing with the passive rack section 6. A pitch power assembly is fixed in the hub 3. The pitch power assembly is connected to the inner race 4.

[0028] In this embodiment, the working principle of one - machine synchronous pitch is as follows:

[0029] The outer shaft ring 5 is driven to rotate by the pitch power assembly. Since the passive rack segment 6 is fixed to the outer shaft ring 5, during the rotation of the outer shaft ring 5, the wind blades are driven to rotate through the engaged passive rack segment 6 and the pitch passive adjusting member 7, and the wind blades are in one-to-one correspondence with the engaged passive rack segment 6 and the pitch passive adjusting member 7. And the passive rack segments 6 are all fixed to the outer shaft ring 5. In this way, driving the outer shaft ring 5 to rotate by the pitch power assembly can control the rotation of all the wind blades, thereby realizing that one motor can adjust the pitch angles of all the wind blades.

[0030] The setting of the pitch power assembly includes but is not limited to the following technical solutions:

[0031] Embodiment 1 (as Figure 4 shown)

[0032] The pitch power assembly includes a pitch motor 8 and a pitch active adjusting member 9 mounted on the pitch motor 8. The pitch active adjusting member 9 is connected to the inner shaft ring 4; the pitch active adjusting member 9 meshes with any one of the passive rack segments 6.

[0033] Embodiment 2 (as Figure 5 shown)

[0034] The pitch power assembly includes a pitch motor 8 and a pitch active adjusting member 9 mounted on the pitch motor 8. An active rack segment 10 is fixed between any two of the passive rack segments 6. The active rack segment 10 meshes with the pitch active adjusting member 9.

[0035] As Figure 1 shown, in any of the above embodiments, preferably, each wind blade includes a bushing 11, a blade 24, and a blade shaft 12 at the bottom of the blade 24. The bushing 11 is fixed on the hub 3 and the pitch passive adjusting member 7 is fixed thereon. The blade shaft 12 is fixedly connected to the bushing 11.

[0036] In this embodiment, through the detachable connection structure between the bushing 11 and the blade shaft 12, when a certain wind blade is damaged or affects the use, the wind blade can be replaced, rather than replacing the entire impeller composed of the hub 3 and the blades, making the disassembly, assembly, and maintenance more convenient and fast, and at the same time saving the maintenance cost.

[0037] In this embodiment, the shape of the blade 24 is gradually widened and thinned from near the blade shaft 12 to the top of the blade 224, and has a twisted angle that coincides with the axial velocity.

[0038] As Figure 3As shown, in any of the above embodiments, preferably, a wind sensor 13 is installed on the top of the nacelle 2, a wind alignment mechanism 14 is installed on the tower 1, the nacelle 2 is installed on the wind alignment mechanism 14, a wind alignment motor 15 is installed in the nacelle 2, and the wind alignment motor 15 is connected to the wind alignment mechanism 14.

[0039] In this embodiment, the wind sensor 13 can monitor environmental parameters such as wind speed and wind direction in real time. According to the change of wind speed, the impeller is dynamically aligned with the direction of the incoming wind in real time through the wind alignment mechanism 14 to optimize the capture efficiency of wind energy, so as to more effectively drive the power generation component to generate electric energy.

[0040] In this embodiment, the wind sensor 13, the wind alignment mechanism 14, the wind alignment motor 15, the power generation component and the power generation component are all well-known technologies and will not be elaborated here.

[0041] As Figure 3 shown, in any of the above embodiments, preferably, the power generation component includes a generator 16 fixed in the nacelle 2 and a main shaft 17 installed on the generator 16, and the main shaft 17 is fixedly connected to the hub 3.

[0042] As Figure 3 shown, in the above embodiment, preferably, the power generation component further includes a gearbox 18 and a braking mechanism 19 connected to the gearbox 18. The gearbox 18 has a power input shaft 20, the braking mechanism 19 has a power output shaft 21, the power input shaft 20 is fixedly connected to the main shaft 17, and the power output shaft 21 is fixedly connected to the generator 16.

[0043] In this embodiment, the six wide blades and the hub 3 rotate under the action of wind to generate mechanical energy, which is transmitted to the gearbox through the main shaft 17. The gearbox converts the low-speed rotation of the blades and the hub 3 into the high-speed rotation required by the generator 16. The generator 16 converts mechanical energy into electric energy through the principle of electromagnetic induction and transmits it to the power grid or energy storage device through a cable.

[0044] In the above embodiment, preferably, a bearing seat 22 is installed in the nacelle 2, and the main shaft 17 is installed on the bearing seat 22.

[0045] As Figure 3 shown, in the above embodiment, preferably, a control system 23 is installed in the nacelle 2, and the control system 23 is electrically connected to the power generation component, the pitch power component, the wind alignment motor 15 and the wind sensor 13 respectively.

[0046] In this embodiment, a one-machine synchronous pitch-changing technology is adopted, that is, one motor controls the synchronous pitch angle change of six blades in a linkage manner. This control process is completed by the control system 23. The system monitors environmental parameters such as wind speed and wind direction in real time through the wind sensor 13, and adjusts the pitch angle of the blades accordingly to optimize the capture efficiency of wind energy and the output power of the generator 16, so as to more effectively drive the generator 16 to convert wind energy into electrical energy.

[0047] In the present invention, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to the present invention.

[0049] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0050] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wind power generation device with one-machine synchronous pitch regulation, comprising a tower, a nacelle installed on the tower, a power generation component installed in the nacelle, a hub installed on the power generation component, and a plurality of blades installed on the hub, the power generation component being connected to the hub, characterized in that: The pitch bearing is installed inside the hub. The pitch bearing is divided into an inner race and an outer race. The inner race is fixed to the hub. A passive rack segment is fixed to the outer race corresponding to each blade. A pitch passive adjusting member is fixed to each blade. The pitch passive adjusting member has teeth meshing with the passive rack segment. A pitch power assembly is fixed inside the hub. The pitch power assembly is connected to the inner race.

2. The wind power generation device with one-machine synchronous pitch according to claim 1, characterized in that: The pitch power assembly includes a pitch motor and a pitch active adjusting member installed on the pitch motor. The pitch active adjusting member is connected to the inner race.

3. The wind power generation device with one-machine synchronous pitch according to claim 2, characterized in that: The pitch active adjusting member meshes with any one of the passive rack segments.

4. The wind power generation device with one-machine synchronous pitch according to claim 2, characterized in that: An active rack segment is fixed between any two of the passive rack segments. The active rack segment meshes with the pitch active adjusting member.

5. The wind power generation device with one-machine synchronous pitch according to any one of claims 1 to 4, characterized in that: Each blade includes a bushing, a blade, and a blade shaft at the bottom of the blade. The bushing is fixed to the hub and the pitch passive adjusting member is fixed thereto. The blade shaft is fixedly connected to the bushing.

6. The wind power generation device with one-machine synchronous pitch according to any one of claims 1 to 4, characterized in that: A wind sensor is installed on the top of the nacelle. A wind alignment mechanism is installed on the tower. The nacelle is installed on the wind alignment mechanism. A wind alignment motor is installed inside the nacelle. The wind alignment motor is connected to the wind alignment mechanism.

7. The wind power generation device with one-machine synchronous pitch according to any one of claims 1 to 4, characterized in that: The power generation assembly includes a generator fixed inside the nacelle and a main shaft installed on the generator. The main shaft is fixedly connected to the hub.

8. The wind power generation device with one-machine synchronous pitch according to claim 7, characterized in that: The power generation assembly further includes a gearbox and a braking mechanism connected to the gearbox. The gearbox has a power input shaft. The braking mechanism has a power output shaft. The power input shaft is fixedly connected to the main shaft. The power output shaft is fixedly connected to the generator.

9. The wind power generation device with one-machine synchronous pitch according to claim 7, characterized in that: A bearing seat is installed inside the nacelle. The main shaft is installed on the bearing seat.

10. The wind power generation device with one-machine synchronous pitch according to claim 6, characterized in that: A control system is installed inside the nacelle. The control system is electrically connected to the power generation assembly, the pitch power assembly, the wind alignment motor, and the wind sensor respectively.

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