A small three-blade wind turbine with synchronous pitch control function

Abstract

The present invention discloses a small three-blade wind turbine with a synchronous pitch-changing function, which relates to the field of wind power generation, and comprises a wind wheel, a nacelle, a generator and a pitch-changing motor; the wind wheel is installed at the front end of the nacelle, and the generator and the pitch-changing motor are installed inside the nacelle; the present invention not only has the power generation capability, but also can realize fast and stable active synchronous pitch changing, and has a small overall size, a simple and compact structure, a low manufacturing cost, easy assembly of the whole machine, convenient repair and maintenance, and a rapid pitch changing response.

Description

Technical Field

[0001] The invention relates to the technical field of wind energy power generation equipment, in particular to a small three-blade direct-drive wind turbine with an active synchronous pitch-changing function. Background Art

[0002] Wind energy is an important direction for the development of new energy due to its cleanliness, renewability and wide distribution. Wind power is the main force in the field of new energy and a clean power generation method with great development potential. In recent years, the development of wind energy has been very rapid. Medium and large generators are the mainstream, and small wind turbines still occupy a part of the market share. At present, the mainstream wind power generation platform in the market is a three-blade variable-pitch variable-speed horizontal axis wind turbine. This type of wind turbine has the characteristics of high wind energy utilization, high stability, high power generation efficiency, and high controllable freedom.

[0003] The popular small-scale civilian horizontal-axis wind turbines in the market are mainly three-blade fixed-pitch constant-speed types, which mostly use passive stall control of blades and passive yaw of tail wing. This type of wind turbine has a simple structure and is easy to maintain, but its power stability is poor, especially in strong wind conditions, it is very easy to be damaged. The passive stall control used by fixed-pitch wind turbines completely relies on the aerodynamic characteristics of the blades themselves, and the manufacturing process is difficult. After the blades stall, the power is unstable, and the quality of the power is difficult to guarantee. Summary of the invention

[0004] In order to achieve efficient and stable pitch control of small wind turbines, the present invention provides a highly integrated wind turbine power generation device, which not only has the ability to generate electricity, but also can achieve fast and stable active synchronous pitch control, and has a small overall size, a simple and compact structure, a low manufacturing cost, easy assembly of the whole machine, convenient repair and maintenance, and a rapid pitch response.

[0005] The present invention achieves the above technical objectives through the following technical means.

[0006] A small three-blade wind turbine with synchronous pitch-changing function comprises a wind rotor, a nacelle, a generator and a pitch-changing motor; the wind rotor is installed at the front end of the nacelle, and the generator and the pitch-changing motor are installed inside the nacelle; the rotation of the wind rotor drives the generator to generate electricity; the pitch-changing motor works to achieve the pitch-changing of the wind rotor;

[0007] The wind wheel includes blades, side plates, blade root cams, transmission connecting rods, special-shaped synchronous discs, hub bottom plates and linear shafts;

[0008] The middle section of the blade root cam is supported by the side plate through a bearing, the portion of the blade root cam protruding from the side plate is installed with a blade, the portion of the blade root cam placed on the inner side of the side plate is connected to one end of a transmission connecting rod through a rotating shaft, and the other end of the transmission connecting rod is connected to a special-shaped synchronization disk, and the special-shaped synchronization disk is arranged in the side plate; the special-shaped synchronization disk is matched with one end of the linear shaft through a bearing, and the other end of the linear shaft is threadedly connected to the output end of the pitch motor; the linear shaft can push the special-shaped synchronization disk to move axially and the special-shaped synchronization disk can rotate around the linear shaft;

[0009] The hub bottom plate is arranged at the end of the side plate, the main shaft below the hub bottom plate is a hollow shaft, and the linear shaft passes through the main shaft; the main shaft is connected to the input end of the generator.

[0010] In the above scheme, there are three blades, and three bearing fixing rings are arranged on the special-shaped synchronous disk. The bearing fixing rings are evenly distributed along the circumference of the special-shaped synchronous disk, and the axis of the bearing fixing ring is parallel to the rotation plane of the special-shaped synchronous disk, and the eccentric surface is perpendicular to the axis of the central through hole of the special-shaped synchronous disk.

[0011] In the above solution, the end of the linear shaft that matches the pitch motor is provided with an external thread, and the output end of the pitch motor is provided with an internal thread.

[0012] In the above solution, a deflector is provided at the front end of the side plate.

[0013] In the above solution, the cabin includes a cabin base and a top shell;

[0014] The top shell cooperates with the cabin base to form a closed space; the cabin base is provided with an engine fixing plate, a pitch motor fixing plate and a bridge-type slider in sequence.

[0015] In the above scheme, the main shaft is connected to the generator through a coupling; a main shaft limiting sleeve is provided on the main shaft; the coupling, the limiting sleeve and the main shaft are all placed in the cabin base.

[0016] In the above solution, two mounting holes are provided on the cabin base and the top shell, and the mounting holes are used to install bearings supporting the main shaft.

[0017] In the above scheme, the threaded part of the linear shaft cooperates with the internal thread of the hollow shaft of the pitch motor, and a flat key is provided at the end of the linear shaft thread and fixed in the D-shaped hole of the bridge-type slider; the two feet of the bridge-type slider are mounted on the light rod, so that the linear shaft and the bridge-type slider can only move axially.

[0018] How to use a small three-blade wind turbine with synchronous pitch control function, including power generation mode, pitch control mode and shutdown mode;

[0019] in,

[0020] Power generation mode:

[0021] When the external wind speed is greater than the cut-in wind speed, the wind wheel absorbs wind energy and rotates, driving the main shaft on the hub bottom plate to rotate. The torque of the main shaft is transmitted to the input shaft of the generator through the coupling. The rotation of the input shaft causes the generator to output electrical energy.

[0022] Pitch mode:

[0023] When the external wind speed is less than the rated wind speed, the pitch angle is set at the optimal angle of attack, and the default pitch angle is 0°; when the wind speed is greater than the rated wind speed, the pitch motor needs to be controlled to increase the blade pitch angle. Specifically:

[0024] The pitch control signal is transmitted to the pitch motor. The rotor inside the pitch motor rotates, causing the linear shaft to move axially. The linear shaft axially pushes the special-shaped synchronous disk. The axial movement of the special-shaped synchronous disk is converted into the rotation of the blade root cam through the transmission connecting rod, thereby realizing pitch control.

[0025] Stop mode:

[0026] When the wind speed exceeds the design range, the variable pitch motor adjusts the pitch angle of the blades to the zero torque position to achieve natural shutdown.

[0027] In the above solution, the range of pitch change is 0° to 100°.

[0028] The specific beneficial effects are reflected in:

[0029] 1. The pitch mechanism and pitch motor composed of blade root cam, transmission connecting rod, special-shaped synchronous disk and linear shaft can realize synchronous pitch of three blades. The pitch angle changes with the wind speed. When the wind speed exceeds the rated wind speed, the wind speed continues to increase, and the pitch angle increases to reduce the energy absorbed by the wind wheel, so that the power is stabilized at the rated power.

[0030] 2. The pitch mechanism provides a pitch range of 0° to 100°, allowing the pitch to be changed to a position where the torque generated by the blades is zero. At this time, the wind rotor will naturally shut down without input. At the same time, the thrust applied to the blades is a braking force in the opposite direction of the wind rotor's rotation, forming an aerodynamic brake, which is an important self-protection measure under extreme wind conditions.

[0031] 3. The streamlined shape of the hub composed of the fairing and side panels completely contains the variable pitch mechanism. At the same time, the shape of the nacelle is also streamlined, which can reduce the axial thrust generated by the incoming wind speed on the hub and nacelle, thereby reducing the overturning moment of the whole machine and improving the safety of the whole machine.

[0032] 4. The variable pitch mechanism designed in the present invention is applied to small wind turbines and can adopt active variable pitch control. It can operate at the optimal angle of attack when the wind speed is lower than the rated wind speed; when the wind speed is higher than the rated speed, the pitch angle is increased to reduce the angle of attack and stabilize the power at the rated value; in the event of extremely strong winds, the pitch is changed to the zero torque position to achieve natural shutdown protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a schematic diagram of the overall structure of a small three-blade wind turbine with a synchronous pitch function according to an embodiment of the present invention;

[0034] Figure 2 The present invention Figure 1 Schematic diagram of the pitch mechanism involved;

[0035] Figure 3 The present invention Figure 1 Schematic diagram of the side panel structure involved;

[0036] Figure 4 The present invention Figure 2 Schematic diagram of the structure of the special-shaped synchronous disk involved;

[0037] Figure 5 The present invention Figure 2 Schematic diagram of the spindle structure involved;

[0038] Figure 6 The present invention Figure 1 Schematic diagram of the cabin base structure involved;

[0039] Figure 7 The present invention Figure 6 Schematic diagram of the bridge-type slider structure involved;

[0040] Figure 8 The present invention Fig. 9 Schematic diagram of the top shell structure involved;

[0041] Fig. 9 It is a schematic diagram of the working state of an embodiment of the present invention.

[0042] The reference numerals are as follows:

[0043] 1-wind wheel, 2-nacelle, 3-generator, 4-pitch motor, 1.1- fairing, 1.2-side plate, 1.3-blade root cam, 1.4-transmission connecting rod, 1.5-special-shaped synchronous disk, 1.51-bearing fixing ring, 1.6-hub base plate, 1.61-main shaft, 1.7-linear shaft, 2.1-nacelle base, 2.2-generator fixing plate, 2.3-pitch motor fixing plate, 2.4-main shaft limiting sleeve, 2.5-coupling, 2.6-bridge slider, 2.61-light rod, 2.7-top shell. DETAILED DESCRIPTION

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] A small three-blade wind turbine with synchronous pitch control function comprises a wind rotor 1, a nacelle 2, a generator 3 and a pitch control motor 4; the wind rotor 1 is installed at the front end of the nacelle 2, the generator 3 and the pitch control motor 4 are installed inside the nacelle 2; the wind rotor 1 rotates to drive the generator 3 to generate electricity; the pitch control motor 4 works to realize the pitch control of the wind rotor 1;

[0048] The wind wheel 1 includes blades, side plates 1.2, blade root cams 1.3, transmission connecting rods 1.4, special-shaped synchronous discs 1.5, hub bottom plates 1.6 and linear shafts 1.7;

[0049] The middle section of the blade root cam 1.3 is supported by the side plate 1.2 through a bearing, and the portion of the blade root cam 1.3 protruding from the side plate 1.2 is installed with a blade, and the portion of the blade root cam 1.3 placed on the inner side of the side plate 1.2 is connected to one end of a transmission connecting rod 1.4 through a rotating shaft, and the other end of the transmission connecting rod 1.4 is connected to a special-shaped synchronization disk 1.5, and the special-shaped synchronization disk 1.5 is arranged in the side plate 1.2; the special-shaped synchronization disk 1.5 is matched with one end of a linear shaft 1.7 through a bearing, and the other end of the linear shaft 1.7 is threadedly connected to the output end of the pitch motor 4; the linear shaft 1.7 can push the special-shaped synchronization disk 1.5 to move axially and the special-shaped synchronization disk 1.5 can rotate around the linear shaft 1.7;

[0050] The hub bottom plate 1.6 is arranged at the end of the side plate 1.2. The main shaft 1.61 below the hub bottom plate 1.6 is a hollow shaft. The linear shaft 1.7 passes through the main shaft 1.61. The main shaft 1.61 is connected to the input end of the generator 3.

[0051] In the above scheme, there are three blades, and three bearing fixing rings 1.51 are arranged on the special-shaped synchronous disk 1.5. The bearing fixing rings 1.51 are evenly distributed along the circumference of the special-shaped synchronous disk 1.5. The axis of the bearing fixing ring 1.51 is parallel to the rotation plane of the special-shaped synchronous disk 1.5, and the eccentric surface is perpendicular to the axis of the central through hole of the special-shaped synchronous disk 1.5.

[0052] In the above solution, the end of the linear shaft 1.7 that matches the pitch motor 4 is provided with an external thread, and the output end of the pitch motor 4 is provided with an internal thread.

[0053] In the above solution, a deflector 1.1 is provided at the front end of the side plate 1.2.

[0054] In the above solution, the cabin 2 includes a cabin base 2.1 and a top shell 2.7;

[0055] The top shell 2.7 cooperates with the cabin base 2.1 to form a closed space; the cabin base 2.1 is provided with an engine fixing plate 2.2, a pitch motor fixing plate 2.3 and a bridge-type slider 2.6 in sequence.

[0056] In the above scheme, the main shaft 1.61 is connected to the generator 3 through the coupling 2.5; a main shaft limiting sleeve 2.4 is provided on the main shaft 1.61; the coupling 2.5, the limiting sleeve 2.4 and the main shaft 1.61 are all placed in the cabin base 2.1.

[0057] In the above solution, two mounting holes are provided on the cabin base 2.1 and the top shell 2.7, and the mounting holes are used to install bearings supporting the main shaft 1.61.

[0058] In the above scheme, the threaded part of the linear shaft 1.7 cooperates with the internal thread of the hollow shaft of the pitch motor 4, and a flat key is provided at the end of the thread of the linear shaft 1.7 and fixed in the D-shaped hole of the bridge-type slider 2.6; the two feet of the bridge-type slider 2.6 are mounted on the light rod 2.61, so that the linear shaft 1.7 and the bridge-type slider 2.6 can only move axially.

[0059] How to use a small three-blade wind turbine with synchronous pitch control function, including power generation mode, pitch control mode and shutdown mode;

[0060] in,

[0061] Power generation mode:

[0062] When the external wind speed is greater than the cut-in wind speed, the wind wheel 1 absorbs wind energy and rotates, driving the main shaft 1.61 on the hub bottom plate 1.6 to rotate, and the torque of the main shaft 1.61 is transmitted to the input shaft of the generator 3 through the coupling 2.5. The rotation of the input shaft causes the generator 3 to output electrical energy.

[0063] Pitch mode:

[0064] When the external wind speed is less than the rated wind speed, the pitch angle is set at the optimal angle of attack, and the default pitch angle is 0°; when the wind speed is greater than the rated wind speed, the pitch motor 4 needs to be controlled to increase the blade pitch angle. Specifically:

[0065] The pitch control signal is transmitted to the pitch motor 4, and the rotor inside the pitch motor 4 rotates, so that the linear shaft 1.7 moves axially, and the linear shaft 1.7 axially pushes the special-shaped synchronous disk 1.5, and the axial movement of the special-shaped synchronous disk 1.5 is converted into the rotation of the blade root cam 1.3 through the transmission connecting rod 1.4, thereby realizing the pitch change;

[0066] Stop mode:

[0067] When the wind speed exceeds the design range, the variable pitch motor 4 adjusts the pitch angle of the blades to a zero torque position to achieve a natural shutdown.

[0068] In the above scheme, the range of pitch change is 0°~100°. Figure 1 As shown, a small three-blade direct-drive wind turbine with stable and efficient active synchronous pitch control is provided in this embodiment. The small wind turbine has a fast and stable active synchronous pitch control function. Its main shaft, generator hollow shaft and pitch motor screw linear shaft are installed on the same axis, and the hub and nacelle shell are streamlined. The pitch angle range is from 0° to 100°, which can realize the movement from the optimal angle of attack of the blade to the zero torque position of the blade, and can achieve stable power output and safe and reliable shutdown protection.

[0069] The structure of the small generator mainly includes a wind rotor 1, a nacelle 2, a generator 3, and a pitch motor 4. The wind rotor 1 is installed at the front end of the nacelle 2, and the generator 3 and the pitch motor 4 are installed inside the nacelle 2.

[0070] Wind wheel 1 (see Figure 2 ), including a deflector 1.1, a side plate 1.2 (see Figure 3 ), blade root cam 1.3 transmission connecting rod 1.4, special-shaped synchronous disc 1.5 (see Figure 4 ), hub base plate 1.6, linear axis 1.7 (see Figure 5 ).

[0071] Cabin 2 (see Figure 6 , 8 ), including the nacelle base 2.1, the generator fixing plate 2.2, the pitch motor fixing plate 2.3, the main shaft limiting sleeve 2.4, the coupling 2.5, the bridge type slider 2.6 (see Figure 7 ), top shell 2.7 (see Figure 8 ).

[0072] In this embodiment, the implementation method of the wind wheel 1 is as follows: the hub bottom plate 1.6 integrates the main shaft and the bottom plate of the hub, and a through hole is provided in the center to allow the linear shaft 1.7 to fit with clearance (see Figure 5 ), the hub bottom plate 1.6 is provided with three mortise holes evenly distributed along the circumference; a bearing mounting through hole is provided in the center of the synchronous special-shaped disc 1.5, and bearings are embedded in the front and rear. A thread is provided at one end of the optical axis of the linear shaft 1.7, and a nut is used to fix the special-shaped synchronous disc 1.5 front and back, so that the special-shaped synchronous disc 1.5 can be pushed by the linear shaft 1.7 for axial movement and can rotate around the linear shaft 1.7; there are three bearing fixing rings 1.51 evenly distributed along the circumference in front of the special-shaped synchronous disc 1.5, and the axis of the bearing fixing ring 1.51 is parallel to the rotation plane of the special-shaped synchronous disc 1.5, and the eccentric surface is perpendicular to the axis of the central through hole of the special-shaped synchronous disc 1.5; one end of the transmission connecting rod 1.4 is connected to this bearing fixing ring 1.51, and the other end is connected to the bearing fixing ring 1.51. One end is connected to the bearing mounting ring 1.51 of the blade root cam 1.3; the bottom of the air deflector 1.1 contains three tenons evenly distributed along the circumferential direction; the upper end of the side plate 1.2 contains a tenon groove, and the lower end contains a tenon; the tenons of the above three side plates 1.2 cooperate with the mortise holes of the hub bottom plate 1.6, and the three tenons of the air deflector 1.1 cooperate with the tenons of the side plate 1.2; each tenon groove is provided with a bolt hole in the radial direction, and the bolts fix the tenon and the tenon groove or the mortise hole; before assembling the side plate 1.2, the blade connecting shaft of the blade root cam 1.3 passes through the through hole on the side plate 1.2, and the shear force and centrifugal force of the blade root are transmitted to the side plate 1.2 through the bearing; the three blades are respectively mounted on the protruding blade root connecting shaft and fixed by radial top screws.

[0073] In this implementation case, the implementation method of the nacelle 2 is as follows: the main shaft 1.61 of the hub base plate 1.6 is sequentially assembled with bearings, main shaft limiting sleeves 2.4 and bearings, and the two bearings on the main shaft 1.61 are respectively embedded in the bearing grooves of the nacelle base 2.1; the generator fixing plate 2.2 and the pitch motor fixing plate 2.3 are both provided with four motor mounting bolt holes, and the bolts fix the generator 3 and the pitch motor 4; tenons are provided on both sides of the motor fixing plate, and the tenons cooperate with the tenons of the nacelle base 2.1; a coupling 2.5 is used to connect the hollow shaft of the generator and the main shaft on the hub base plate 1.6, and fixed with a top screw; through holes are provided at both ends of the bridge slider 2.6, and the light rod 2 .61 is installed in the through hole at the tail end of the cabin base 2.1, and the two bare rods 2.61 pass through the through holes at both ends of the bridge-type slider 2.6 respectively, allowing the bridge-type slider 2.6 to only move axially; the screw at one end of the rear end of the linear shaft 1.7 is threadedly matched with the pitch motor 4. After the linear shaft 1.7 passes through the pitch motor 4, the end of the screw of the linear shaft 1.7 is fixed to the D-shaped hole of the bridge-type slider 2.6, and the internal rotation of the pitch motor 4 can make the linear shaft 1.7 move axially; the interior of the top outer shell 2.7 is provided with two mortise and tenon grooves that cooperate with the tenons of the motor fixing plate, and the six outer bolt through holes are aligned with the six outer bolt holes of the cabin base 2.1, and the bolts are tightened to ensure.

[0074] The threaded portion of the linear shaft 1.7 cooperates with the internal thread of the hollow shaft of the pitch motor 4. A flat key is provided at the end of the thread of the linear shaft 1.7 and fixed to the D-shaped hole of the bridge-type slider 2.6. The two feet of the bridge-type slider 2.6 are mounted on the polished rod 2.61, so that the linear shaft 1.7 and the bridge-type slider 2.6 can only move axially.

[0075] The working principle and specific working process of this embodiment are as follows: when the external wind speed is greater than the cut-in wind speed, the wind wheel 1 absorbs wind energy and rotates, driving the main shaft on the hub base plate 1.6 to rotate, and the main shaft torque is transmitted to the hollow shaft of the generator 3 through the coupling 2.5. The rotation of the hollow shaft causes the generator 3 to output electrical energy to the outside; when the external wind speed is less than the rated wind speed, the pitch angle is set at the optimal angle of attack; when the wind speed is greater than the rated wind speed, it is necessary to control the pitch motor 4 to increase the blade pitch angle. Specific process of pitch change: the pitch control signal is transmitted to the pitch motor 4, and the rotor inside the pitch motor 4 rotates, causing the lead screw to move axially. The lead screw, i.e. the linear shaft 1.7, axially pushes the special-shaped synchronous disk 1.5, and the axial movement of the special-shaped synchronous disk 1.5 is converted into the rotation of the blade root connecting cam 1.3 through the transmission connecting rod 1.4, thereby realizing the pitch change function; when the wind speed exceeds the design range, the pitch motor 4 drives the pitch mechanism to operate, adjusts the pitch angle of the blade to the zero torque position, realizes the natural shutdown of the wind turbine, and thus realizes the self-protection function.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0077] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A small three-blade wind turbine with synchronous pitch control function, characterized in that: The invention comprises a wind wheel (1), a nacelle (2), a generator (3) and a pitch-changing motor (4); the wind wheel (1) is mounted at the front end of the nacelle (2), and the generator (3) and the pitch-changing motor (4) are mounted inside the nacelle (2); the wind wheel (1) rotates to drive the generator (3) to generate electricity; the pitch-changing motor (4) works to achieve pitch-changing of the wind wheel (1); The wind wheel (1) comprises blades, side plates (1.2), blade root cams (1.3), transmission connecting rods (1.4), special-shaped synchronization disks (1.5), hub base plates (1.6) and linear shafts (1.7); The middle section of the blade root cam (1.3) is supported by the side plate (1.2) via a bearing, a portion of the blade root cam (1.3) protruding from the side plate (1.2) is provided with a blade, a portion of the blade root cam (1.3) disposed on the inner side of the side plate (1.2) is connected to one end of a transmission connecting rod (1.4) via a rotating shaft, the other end of the transmission connecting rod (1.4) is connected to a special-shaped synchronization disk (1.5), and the special-shaped synchronization disk (1.5) is disposed in the side plate (1.2); the special-shaped synchronization disk (1.5) is matched with one end of a linear shaft (1.7) via a bearing, and the other end of the linear shaft (1.7) is threadedly connected to the output end of the pitch motor (4); the linear shaft (1.7) can push the special-shaped synchronization disk (1.5) to move axially, and the special-shaped synchronization disk (1.5) can rotate around the linear shaft (1.7); The hub bottom plate (1.6) is arranged at the end of the side plate (1.2); the main shaft (1.61) below the hub bottom plate (1.6) is a hollow shaft, and the linear shaft (1.7) passes through the main shaft (1.61); the main shaft (1.61) is connected to the input end of the generator (3); The blades have three blades, and the special-shaped synchronous disk (1.5) is provided with three bearing fixing rings (1.51), the bearing fixing rings (1.51) are evenly distributed along the circumference of the special-shaped synchronous disk (1.5), and the axes of the bearing fixing rings (1.51) are parallel to the rotation plane of the special-shaped synchronous disk (1.5), and are eccentrically perpendicular to the axis of the central through hole of the special-shaped synchronous disk (1.5); the nacelle (2) comprises a nacelle base (2.1) and a top shell (2.7); The top shell (2.7) cooperates with the cabin base (2.1) to form a closed space; the cabin base (2.1) is provided with an engine fixing plate (2.2), a pitch motor fixing plate (2.3) and a bridge-type slider (2.6) in sequence; the threaded portion of the linear shaft (1.7) cooperates with the internal thread of the hollow shaft of the pitch motor (4), and a flat key is provided at the end of the thread of the linear shaft (1.7) and fixed in the D-shaped hole of the bridge-type slider (2.6); the two feet of the bridge-type slider (2.6) are mounted on the light rod (2.61), so that the linear shaft (1.7) and the bridge-type slider (2.6) can only move axially.

2. The small three-blade wind turbine with synchronous pitch control function according to claim 1, characterized in that: The matching end of the linear shaft (1.7) and the variable pitch motor (4) is provided with an external thread, and the output end of the variable pitch motor (4) is provided with an internal thread.

3. The small three-blade wind turbine with synchronous pitch control function according to claim 1, characterized in that: A flow guide cover (1.1) is provided at the front end of the side plate (1.2).

4. The small three-blade wind turbine with synchronous pitch control function according to claim 1, characterized in that: The main shaft (1.61) is connected to the generator (3) via a coupling (2.5); a main shaft limiting sleeve (2.4) is provided on the main shaft (1.61); the coupling (2.5), the limiting sleeve (2.4) and the main shaft (1.61) are all placed in the cabin base (2.1).

5. The small three-blade wind turbine with synchronous pitch control function according to claim 1, characterized in that: The cabin base (2.1) and the top shell (2.7) are provided with two mounting holes, and the mounting holes are used to mount bearings supporting the main shaft (1.61).

6. The method for using a small three-blade wind turbine with synchronous pitch control function according to any one of claims 1 to 5, characterized in that: Power generation mode, pitch control mode and shutdown mode; Among them, power generation mode: When the external wind speed is greater than the cut-in wind speed, the wind wheel (1) absorbs wind energy and rotates, driving the main shaft (1.61) on the hub base plate (1.6) to rotate, and the torque of the main shaft (1.61) is transmitted to the input shaft of the generator (3) through the coupling (2.5). The input shaft rotates to enable the generator (3) to output electrical energy externally. Pitch mode: When the external wind speed is less than the rated wind speed, the pitch angle is set at the optimal angle of attack, which is 0° by default; when the wind speed is greater than the rated wind speed, the pitch motor (4) needs to be controlled to increase the blade pitch angle, specifically: The pitch control signal is transmitted to the pitch motor (4), and the rotor inside the pitch motor (4) rotates, causing the linear shaft (1.7) to move axially. The linear shaft (1.7) axially pushes the special-shaped synchronous disk (1.5), and the axial movement of the special-shaped synchronous disk (1.5) is converted into the rotation of the blade root cam (1.3) through the transmission connecting rod (1.4), thereby realizing pitch control; Stop mode: When the wind speed exceeds the design range, the variable pitch motor (4) adjusts the pitch angle of the blades to a zero torque position to achieve a natural stop.

7. The method for using a small three-blade wind turbine with synchronous pitch control function according to claim 6, characterized in that: The pitch range is 0°~100°.

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