Wind turbine with blade protection function and protection method

Abstract

The present invention relates to a wind turbine with blade protection function and a protection method, comprising: a nacelle, a wind shield, blades and a transmission assembly, wherein the wind shield is conical and hollow inside, the wind shield is rotatably connected to the nacelle, a transmission cylinder is arranged inside the wind shield along its axial direction, and a connecting shaft is arranged at one end of the blade; the transmission assembly comprises a connecting disk, a gear ring and a transmission shaft, the connecting disk slides axially and is circumferentially connected to the inner wall surface of the transmission cylinder; the connecting shaft is arranged along the radial direction of the connecting disk and is rotatably connected to the connecting disk; the gear ring is coaxially arranged with the connecting shaft and is tightly connected, a rack meshing with the gear ring is tightly connected to the outer wall surface of the transmission cylinder along its axial direction, the transmission shaft is transmission-connected between the connecting disk and the power input end of the generator inside the nacelle and is slidably connected to the bottom end of the wind shield, and the present invention solves the technical problem that the windward area of ​​the blades of the traditional wind turbine generator cannot be adjusted by deflecting the blades during the axial movement of the connecting disk and the transmission shaft along the wind shield.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and more particularly to a wind power generator with blade protection function and a protection method. Background Art

[0002] With the continuous development of social economy, more and more people are beginning to pay attention to wind energy, a clean and renewable energy, in order to increase power generation and ensure the smooth progress of various social activities.

[0003] During the operation of wind turbines, it is inevitable to encounter severe weather such as strong winds. In scenarios where the wind speed is too fast, since the windward side of the wind turbine blades is fixed, it is easy to disintegrate due to the excessive speed, causing great economic losses and safety hazards.

[0004] In traditional wind turbines, most blades are not adjustable, or the windward angle of the blades is adjusted by motor drive, and then the transmission between the blades and the generator is disconnected by other devices. This method increases the overall structural difficulty and manufacturing cost.

[0005] Therefore, how to provide a new device for protecting wind turbine blades, which can disconnect the transmission between the blades and the generator and allow the blades to automatically deflect under the action of wind force is an urgent problem that needs to be solved by technical personnel in this field. Summary of the invention

[0006] In view of this, the present invention provides a new wind turbine with blade protection function, aiming to solve the technical problem that the above-mentioned traditional wind turbine blade protection device and power disconnect device are arranged separately, which greatly increases the product complexity and manufacturing cost.

[0007] A wind turbine with blade protection function, comprising:

[0008] The engine room, inside which the generator is arranged;

[0009] The wind shield is conical and hollow inside, the big end of the wind shield is rotatably connected to one end wall of the cabin, a transmission cylinder is arranged inside the wind shield along its axial direction, and a plurality of long strip avoidance holes are arranged at intervals along its circumferential direction on the outer wall of the wind shield, and the length direction of the avoidance holes is arranged along the axial direction of the wind shield;

[0010] Blades, there are multiple blades and one end of each blade is fastened to a connecting shaft;

[0011] A transmission assembly, the transmission assembly includes a connecting disk, a gear ring and a transmission shaft, the connecting disk slides axially and is connected to the inner wall of the transmission cylinder in a circumferential manner, and a transmission hole is opened along its axial position; the connecting shaft is arranged along the radial direction of the connecting disk and is rotatably connected to the connecting disk through the avoidance hole; the gear ring is coaxially and tightly connected to the outer wall of the connecting shaft in the corresponding wind hood, and the outer wall of the transmission cylinder is tightly connected along its axial direction with a rack arranged corresponding to the gear ring, and the rack is meshed with the gear ring for transmission; the first end of the transmission shaft is transmission-connected to the axially movable transmission hole of the connecting disk, and the second end thereof slides through the wind hood and the large head end is located inside the cabin and is transmission-connected to the power input end of the generator.

[0012] Through the above technical scheme, the present invention connects the connecting disk axially sliding and circumferentially transmitting inside the transmission cylinder arranged along the axial direction of the wind hood, the transmission shaft is coaxially arranged with the connecting disk and slidably connected with the bottom end of the wind hood, thereby, the connecting disk and the transmission shaft can move simultaneously along the axial direction of the wind hood, in addition, the connecting shaft is rotatably connected with the connecting disk along the radial direction of the connecting disk, and a gear ring is fastened to the connecting shaft for transmission with the rack inside the wind hood, on the one hand, the circumferential fixed position of the connecting shaft and the wind hood is positioned, and on the other hand, the connecting shaft can rotate during the axial movement of the connecting disk, that is, when facing strong winds, the connecting shaft can be deflected along its axial position, and multiple blades deflect synchronously, and during its deflection, the connecting disk pushes the transmission shaft toward the cabin, which has the characteristics of adjustable windward surface of the blade, no influence on power transmission during adjustment of the windward surface, and simple structure.

[0013] Preferably, it also includes a tower, which is erected on the ground, and the bottom end of the cabin is rotatably connected to the top end of the tower.

[0014] Preferably, the wind cover includes a conical cover, a funnel-shaped connecting chassis and a retaining ring, the bottom end of the conical cover is arranged opposite to a side wall of the cabin; the connecting chassis is coaxially arranged with the conical cover, its large opening end is tightly connected to the bottom end of the conical cover, and its small opening end is rotatably connected to the cabin; the second end of the transmission shaft is slidingly connected to the inner wall of the small opening end of the connecting chassis, and passes through the small opening end of the connecting chassis to be located inside the cabin; the transmission cylinder is coaxially arranged with the conical cover, and one end of the transmission cylinder is tightly connected to the inner wall of the conical cover, and the retaining ring is coaxially arranged with the transmission cylinder, and is tightly connected to the opening end of the transmission cylinder.

[0015] Preferably, it also includes a connecting column, which is arranged along the radial direction of the connecting disk, and one end of which is tightly connected to the side wall surface of the connecting disk, and the other end of which is provided with a mounting groove along the axial direction of the connecting column, and the inner side wall of the mounting groove is provided with an annular avoidance groove along the circumferential direction of the connecting column, and the outer wall of the connecting column is provided with a connecting groove that passes through the avoidance groove, the connecting shaft is rotatably connected to the mounting groove, the gear ring is located in the avoidance groove, and its teeth are exposed to the outer wall surface of the connecting column through the connecting groove to mesh with the rack for transmission.

[0016] Preferably, the number of the connecting columns and blades is three, and they are evenly arranged along the circumference of the connecting disk.

[0017] Preferably, it also includes a hydraulic rod, the fixed end of the hydraulic rod is fastened to the inner wall of the cabin, the telescopic end of the hydraulic rod is rotatably connected to the second end of the transmission shaft, a gear ring 2 is fastened to the side wall of the transmission shaft near its second end, a gear ring 3 is fastened to the power input end of the generator, gear ring 2 is meshed with gear ring 3 for transmission and is slidably connected along the axial direction of the transmission shaft.

[0018] Preferably, it also includes a connecting part, which includes a vertical plate, a support shaft and a speed sensor, the two vertical plates have their plate surfaces arranged opposite to each other and their bottom ends are fastened to the bottom surface of the interior of the cabin, the axis of the support shaft is arranged parallel to the axis of the transmission shaft, both ends of the support shaft are rotatably connected to the two vertical plates respectively, and both ends pass through the vertical plates and one end is connected to the power input end of the generator through a coupling, and the other end is fastened to the detection input end of the speed sensor, and the support shaft is fastened with a gear ring three on the outer surface between the two vertical plates.

[0019] Preferably, it also includes a hydraulic station, which is installed inside the cabin and connected to the hydraulic rod pipeline.

[0020] Preferably, it also includes a controller, which is electrically connected to the rotation speed sensor and the control module of the hydraulic station.

[0021] A method for protecting wind turbine blades disconnects the power transmission between a generator and a connecting disk by controlling the retraction of a transmission shaft. At the same time, the connecting disk can slide along the axis of a wind shield when it lacks support. The blades rotate during the sliding of the connecting disk. Under the action of wind force, the blades deflect along the connecting shaft, reducing the windward area of ​​the blades to protect the blades.

[0022] Through the above technical scheme, the present invention disconnects the axial support of the connecting plate by retracting the transmission shaft, so that it can slide along the axial direction of the wind cover. During the sliding of the connecting plate, the connecting shaft of the blade lacks axial limit, so that it can deflect along its axial direction. Therefore, in severe weather with high wind speed, during the process of disconnecting the power transmission between the connecting shaft and the generator, the blades can be deflected under the action of wind force, so that there is a smaller contact area between the blades and the wind, which has the characteristics of protecting the generator while protecting the blades.

[0023] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a wind turbine with blade protection function and a protection method, which has the following beneficial effects:

[0024] 1. The connecting plate rotates synchronously with the wind cover, and the bottom of the wind cover provides support for its rotation. The transmission shaft passes through the bottom of the wind cover and is located inside the cabin. The support and transmission do not interfere with each other, and the structure is compact.

[0025] 2. The transmission mode of meshing the gear ring with the rack provides the basis for the rotation of the blades and can improve the repeatability of the positioning during the rotation of the blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional schematic diagram of a wind turbine with blade protection function provided by the present invention;

[0027] Figure 2 An exploded schematic diagram of a wind turbine with blade protection function provided by the present invention;

[0028] Figure 3 A top view of a wind turbine with blade protection function provided by the present invention;

[0029] Figure 4 for Figure 3 AA section view;

[0030] Figure 5 A three-dimensional schematic diagram of a conical cover 21 provided by the present invention;

[0031] Figure 6 A partial cross-sectional view of the connection disk 31 provided by the present invention;

[0032] Figure 7 This is a three-dimensional schematic diagram of the blade 32 provided by the present invention.

[0033] Among them: 1-cabin; 2-wind cover; 3-transmission assembly; 4-tower; 11-generator; 12-hydraulic rod; 13-gear ring 2; 14-gear ring 3; 15-connecting part; 16-hydraulic station; 21-conical cover; 22-connecting chassis; 23-transmission cylinder; 24-blocking ring; 31-connecting plate; 32-blade; 33-gear ring 1; 34-transmission shaft; 35-rack; 36-spring; 37-connecting Connecting plate; 151-vertical plate; 152-support shaft; 153-coupling; 154-speed sensor; 211-long hole; 232-transmission groove; 233-avoidance hole 1; 311-transmission hole; 312-connecting column; 313-transmission protrusion; 321-connecting shaft; 322-blade body; 341-bevel gear; 3121-installation groove; 3122-avoidance groove; 3123-connecting groove. DETAILED DESCRIPTION

[0034] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0035] See attached Figure 1-7 , the embodiment of the present invention discloses a wind turbine with blade protection function, comprising: a nacelle 1, a wind shield 2, blades 32 and a transmission assembly 3;

[0036] A generator 11 is arranged inside the nacelle 1;

[0037] The wind shield 2 is conical and hollow inside. The big end of the wind shield 2 is rotatably connected to one end wall of the cabin 1. A transmission cylinder 23 is arranged inside the wind shield 2 along its axial direction. The outer wall of the wind shield 2 is provided with a plurality of long strip avoidance holes 211 at intervals along its circumferential direction. The length direction of the avoidance holes 211 is arranged along the axial direction of the wind shield 2.

[0038] There are multiple blades 32, and one end of each blade is fastened to a connecting shaft 321;

[0039] The transmission assembly 3 includes a connecting disk 31, a gear ring 33 and a transmission shaft 34. The connecting disk 31 is axially slidable and circumferentially transmitted and connected to the inner wall surface of the transmission cylinder 23, and a transmission hole 311 is opened along its axial position; the connecting shaft 321 is arranged along the radial direction of the connecting disk 31 and passes through the avoidance hole 211 to be rotatably connected to the connecting disk 31; the gear ring 33 is coaxially and tightly connected to the outer wall surface of the connecting shaft 321 in the corresponding wind hood 2, and the outer wall surface of the transmission cylinder 23 is tightly connected along its axial direction with a rack 35 arranged corresponding to the gear ring 33, and the rack 35 is meshed with the gear ring 33 for transmission; the first end of the transmission shaft 34 is transmission-connected to the axially movable transmission hole 311 of the connecting disk 31, and the second end thereof slides through the large head end of the wind hood 2 and is located inside the cabin 1, and is transmission-connected to the power input end of the generator 11.

[0040] Specifically, the rack 35 is fastened to the outer wall surface of the transmission cylinder 23 via an L-shaped connecting plate 37 .

[0041] Specifically, the blade 32 includes a connecting shaft 321 and a blade body 322 , and the connecting shaft 321 is fastened to one end of the blade body 322 along the length direction thereof.

[0042] In some embodiments, a tower 4 is further included, and the tower 4 is erected on the ground. The bottom end of the cabin 1 is rotatably connected to the top end of the tower 4 .

[0043] In other embodiments, the wind cover 2 includes a conical cover 21, a funnel-shaped connecting chassis 22 and a retaining ring 24, the bottom end of the conical cover 21 is arranged opposite to a side wall of the cabin 1; the connecting chassis 22 is coaxially arranged with the conical cover 21, its large opening end is tightly connected to the bottom end of the conical cover 21, and its small opening end is rotatably connected to the cabin 1; the second end of the transmission shaft 34 is slidingly connected to the inner wall of the small opening end of the connecting chassis 22, and passes through the small opening end of the connecting chassis 22 and is located inside the cabin 1; the transmission cylinder 23 is coaxially arranged with the conical cover 21, and one end thereof is tightly connected to the inner wall of the conical cover 21, and the retaining ring 24 is coaxially arranged with the transmission cylinder 23 and tightly connected to the opening end of the transmission cylinder 23.

[0044] Specifically, the first end of the transmission shaft 34 is fastened with a bevel gear 341 along its axial direction, and its small end faces the tip of the wind hood 2. The transmission hole 311 is conical, and its wall surface is provided with tooth grooves arranged corresponding to the bevel gear 341. Therefore, the bevel gear 341 can provide axial support for the transmission hole 311 while transmitting with the transmission hole 311.

[0045] More specifically, the inner diameter of the inner ring surface of the retaining ring 24 is larger than the maximum outer contour of the bevel gear 341 , thereby not interfering with the movement of the transmission shaft 34 .

[0046] More specifically, it also includes a spring 36, one end of which contacts and abuts the bottom surface of the conical cover 21 located in the transmission cylinder 23, and the other end contacts and abuts the end surface of the small head end of the transmission hole 311 of the connecting plate 31. Therefore, the spring 36 can provide assistance to the sliding of the connecting plate 31 along its axis.

[0047] Specifically, the outer wall surface of the small opening end of the connecting chassis 22 is fastened with an annular limiting protrusion along its circumference, and a rotating connection port arranged corresponding to the outer diameter of the small opening end of the connecting chassis 22 is opened on one end face of the cabin along its length direction, and a limiting groove arranged corresponding to the limiting protrusion is opened in the rotating connection port along its circumference, the outer wall surface of the small opening end of the connecting chassis 22 is rotatably connected to the rotating connection port and has a clearance fit, and the limiting protrusion is located inside the limiting groove and has a clearance fit, thereby limiting the axial direction between the connecting chassis 22 and the rotating connection port.

[0048] Specifically, the joint between the large opening end of the chassis 22 and the bottom end of the conical cover 21 is arranged flush, thereby reducing wind resistance and improving the exquisite perception of the appearance.

[0049] In one embodiment, a connecting column 312 is further included. The connecting column 312 is arranged along the radial direction of the connecting disk 31, and one end thereof is tightly connected to the side wall surface of the connecting disk 31, and the other end thereof is provided with a mounting groove 3121 along the axial direction of the connecting column 312, and the inner side wall of the mounting groove 3121 is provided with an annular avoidance groove 3122 along the circumferential direction of the connecting column 312, and the outer wall of the connecting column 312 is provided with a connecting groove 3123 that passes through the avoidance groove 3122, and the connecting shaft 321 is rotatably connected to the mounting groove 3121, and the gear ring 33 is located in the avoidance groove 3122 and its teeth are exposed to the outer wall surface of the connecting column 312 through the connecting groove 3123 to engage with the rack 35 for transmission.

[0050] Specifically, a transmission protrusion 313 is arranged on the outer wall surface of the connecting disk 31 between the two connecting columns 312. The transmission protrusion 313 is arranged along the axial direction of the connecting disk 31. The inner wall surface of the transmission cylinder 23 is provided with a transmission groove 232 arranged corresponding to the transmission protrusion 313 along its axial direction. The transmission protrusion 313 and the transmission groove 232 are loosely matched and slidably connected along the axial direction of the connecting disk 31. Therefore, when the connecting disk 31 slides along its axial direction, the transmission between the connecting disk 31 and the transmission cylinder 23 is not affected.

[0051] More specifically, the transmission cylinder 23 is provided with an avoidance hole 233 along its axial direction and arranged opposite to the avoidance hole 211 .

[0052] In one embodiment, the number of the connecting columns 312 and the blades 32 is three, which are evenly arranged along the circumference of the connecting disk 31 .

[0053] In some embodiments, it also includes a hydraulic rod 12, the fixed end of the hydraulic rod 12 is fastened to the inner wall of the cabin 1, the telescopic end of the hydraulic rod 12 is rotatably connected to the second end of the transmission shaft 34, the side wall of the transmission shaft 34 near its second end is fastened with a gear ring 2 13, the power input end of the generator 11 is fastened with a gear ring 3 14, the gear ring 2 13 is meshed with the gear ring 3 14 for transmission and is slidably connected along the axial direction of the transmission shaft 34.

[0054] In this embodiment, a connecting part 15 is also included, and the connecting part 15 includes a vertical plate 151, a support shaft 152 and a speed sensor 154. The two vertical plates 151 are arranged with their plate surfaces facing each other and their bottom ends are fastened to the bottom surface inside the nacelle 1. The axis of the support shaft 152 is arranged parallel to the axis of the transmission shaft 34. The two ends of the support shaft 152 are respectively rotatably connected to the two vertical plates 151, and both ends pass through the vertical plates 151 and one end is connected to the power input end of the generator 11 through a coupling 153, and the other end is fastened to the detection input end of the speed sensor 154. The outer surface of the support shaft 152 located between the two vertical plates 151 is fastened with a gear ring 3 14. As a result, the gear ring 3 14 is more stable during rotation.

[0055] In some specific embodiments, a hydraulic station 16 is further included. The hydraulic station 16 is installed inside the cabin 1 and is connected to the hydraulic rod 12 through a pipeline.

[0056] In some other specific embodiments, a controller is further included, and the controller is electrically connected to the rotation speed sensor 154 and the control module of the hydraulic station 16 .

[0057] The specific principle and use method of a wind turbine with blade protection function provided in this embodiment are as follows:

[0058] 1. The controller determines the wind speed at that time based on the monitoring data of the speed sensor 154;

[0059] 2. When the controller senses that the wind speed exceeds the maximum limit, the control module of the hydraulic station 16 controls the telescopic end of the hydraulic rod 12 to retract, driving the first end of the transmission shaft 34 to move toward the direction of the nacelle 1. At the same time, the connecting plate 31 moves in the same direction as the transmission shaft 34 under the push of the spring 36 and the action of the wind. Since the gear ring 33, which is tightly connected to the connecting shaft 321, is meshed with the rack 35 for transmission, the connecting shaft 321 deflects during the movement of the connecting plate 31, thereby reducing the contact area between the blade body 322 and the wind, thereby protecting the blade body 322.

[0060] 3. The first end of the transmission shaft 34 continues to move toward the nacelle 1 until it passes through the inner annular surface of the retaining ring 24 and is located outside the transmission cylinder 23 , disconnecting the transmission between the connecting disk 31 and the generator 11 , thereby protecting the generator 11 .

[0061] A method for protecting wind turbine blades is provided by controlling the drive shaft 34 to retract and disconnect the power transmission between the generator 11 and the connecting disk 31. At the same time, the connecting disk 31 can slide along the axis of the wind cover 2 when it lacks support. The blades 32 will rotate during the sliding process of the connecting disk 31. Under the action of wind force, the blades 32 will deflect along the connecting shaft 321, reducing the windward area of ​​the blades 32 to protect the blades 32.

[0062] The specific principle and use method of a wind turbine blade protection method provided in this embodiment are: the axial movement of the connecting disk 31 is limited by the support shaft 34, and then the rotation of the connecting shaft 321 is limited; during the process of the support shaft 34 supporting and transmitting the connecting disk 31, the connecting disk 31 cannot slide along its axial direction, and the connecting shaft 321 cannot rotate, and the wind force can be normally transmitted to the generator 11; when the support shaft 34 disconnects the transmission and support from the connecting disk 31, the connecting disk 31 can slide along its axial direction, that is, the connecting shaft 321 can rotate, and after the rotation, the contact area between the blade body 322 and the wind is reduced, thereby protecting the blade body 322 and the generator 11.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wind turbine with blade protection function, characterized in that: include: A nacelle (1), wherein a generator (11) is arranged inside the nacelle (1); A wind shield (2), the wind shield (2) is conical and hollow inside, the large end of the wind shield (2) is rotatably connected to an end wall of the nacelle (1), a transmission cylinder (23) is arranged inside the wind shield (2) along its axial direction, and a plurality of long strip-shaped avoidance holes (211) are arranged at intervals along its circumferential direction on the outer wall of the wind shield (2), and the length direction of the avoidance holes (211) is arranged along the axial direction of the wind shield (2); Blades (32), the blades (32) being multiple and each having one end fixedly connected to a connecting shaft (321); A transmission assembly (3), the transmission assembly (3) comprising a connecting disk (31), a toothed ring (33) and a transmission shaft (34); the connecting disk (31) is axially slidable and circumferentially transmission-connected to the inner wall surface of the transmission cylinder (23), and a transmission hole (311) is provided along its axis; the connecting shaft (321) is arranged along the radial direction of the connecting disk (31) and passes through the avoidance hole (211) to be rotationally connected to the connecting disk (31); the toothed ring (33) is connected to the connecting shaft (321) in the corresponding wind shield (2) The outer wall surface of the transmission cylinder (23) is coaxially and tightly connected with the outer wall surface of the transmission cylinder (23), and the outer wall surface of the transmission cylinder (23) is tightly connected with a rack (35) arranged corresponding to the gear ring (33) along its axial direction, and the rack (35) is meshed with the gear ring (33) for transmission; the first end of the transmission shaft (34) is transmission-connected with the axially movable transmission hole (311) of the connecting plate (31), and the second end thereof slides through the large end of the wind cover (2) and is located inside the nacelle (1), and is transmission-connected with the power input end of the generator (11).

2. A wind turbine with blade protection function according to claim 1, characterized in that: It also comprises a tower (4), wherein the tower (4) is erected on the ground, and the bottom end of the cabin (1) is rotatably connected to the top end of the tower (4).

3. A wind turbine with blade protection function according to claim 1, characterized in that: The wind cover (2) comprises a conical cover (21), a funnel-shaped connecting chassis (22) and a retaining ring (24); the bottom end of the conical cover (21) is arranged opposite to a side wall of the cabin (1); the connecting chassis (22) is coaxially arranged with the conical cover (21), a large opening end of which is tightly connected to the bottom end of the conical cover (21), and a small opening end of which is rotatably connected to the cabin (1); the second end of the transmission shaft (34) is slidably connected to the inner wall of the small opening end of the connecting chassis (22), and passes through the small opening end of the connecting chassis (22) and is located inside the cabin (1); the transmission cylinder (23) is coaxially arranged with the conical cover (21), and one end of which is tightly connected to the inner wall of the conical cover (21); the retaining ring (24) is coaxially arranged with the transmission cylinder (23), and is tightly connected to the opening end of the transmission cylinder (23).

4. A wind turbine with blade protection function according to claim 3, characterized in that: The invention also comprises a connecting column (312), wherein the connecting column (312) is arranged along the radial direction of the connecting disk (31), and one end of the connecting column (312) is tightly connected to the side wall surface of the connecting disk (31), and the other end of the connecting column (312) is provided with a mounting groove (3121) along the axial direction of the connecting column (312), and the inner side wall of the mounting groove (3121) is provided with an annular avoidance groove (3122) along the circumferential direction of the connecting column (312), and the outer wall of the connecting column (312) is provided with a connecting groove (3123) penetrating the avoidance groove (3122), the connecting shaft (321) is rotatably connected to the mounting groove (3121), and the gear ring (33) is located in the avoidance groove (3122) and its teeth are exposed to the outer wall surface of the connecting column (312) through the connecting groove (3123) to mesh with the rack (35) for transmission.

5. A wind turbine with blade protection function according to claim 4, characterized in that: The number of the connecting columns (312) and the blades (32) is three, and they are evenly arranged along the circumference of the connecting disk (31).

6. A wind turbine with blade protection function according to claim 1, characterized in that: It also includes a hydraulic rod (12), the fixed end of the hydraulic rod (12) is tightly connected to the inner wall of the cabin (1), the telescopic end of the hydraulic rod (12) is rotatably connected to the second end of the transmission shaft (34), a second gear ring (13) is tightly connected to the side wall of the transmission shaft (34) near its second end, a third gear ring (14) is tightly connected to the power input end of the generator (11), the second gear ring (13) is meshed with the third gear ring (14) for transmission and is slidably connected along the axial direction of the transmission shaft (34).

7. A wind turbine with blade protection function according to claim 6, characterized in that: The invention also comprises a connecting part (15), wherein the connecting part (15) comprises a vertical plate (151), a support shaft (152) and a rotation speed sensor (154); the two vertical plates (151) are arranged with their plate surfaces facing each other and their bottom ends are fastened to the bottom surface of the interior of the cabin (1); the axis of the support shaft (152) is arranged parallel to the axis of the transmission shaft (34); the two ends of the support shaft (152) are respectively rotatably connected to the two vertical plates (151); both ends of the support shaft (152) pass through the vertical plates (151) and one end is connected to the power input end of the generator (11) through a coupling (153); the other end is fastened to the detection input end of the rotation speed sensor (154); and a gear ring three (14) is fastened to the outer surface of the support shaft (152) located between the two vertical plates (151).

8. A wind turbine with blade protection function according to claim 7, characterized in that: It also comprises a hydraulic station (16), wherein the hydraulic station (16) is installed inside the cabin (1), and the hydraulic station (16) is connected to the hydraulic rod (12) through a pipeline.

9. A wind turbine with blade protection function according to claim 8, characterized in that: It also includes a controller, which is electrically connected to the rotation speed sensor (154) and a control module of the hydraulic station (16).

10. A method for protecting a wind turbine with blade protection function according to any one of claims 1 to 9, characterized in that: The transmission shaft (34) is retracted to disconnect the power transmission between the generator (11) and the connecting disk (31). At the same time, the connecting disk (31) can slide along the axis of the wind shield (2) when it lacks support. The blades (32) rotate during the sliding of the connecting disk (31). Under the action of wind force, the blades (32) deflect along the connecting shaft (321), thereby reducing the windward area of ​​the blades (32) to protect the blades (32).

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