Wind turbine speed limiting control device

Abstract

This application relates to a wind turbine speed limiting control device, including a generator set, a blade assembly, and a support column. The generator set generates electricity via the rotation of the blade assembly. The generator set includes a speed limiting component and a generator. The output end of the blade assembly is adapted to be connected to the input end of the generator via the speed limiting component. The speed limiting component and the output end of the blade assembly can switch between a first operating state, a second operating state, and a third operating state. In the first operating state, the speed limiting component presses against the output end of the blade assembly, and there is no relative displacement between the speed limiting component and the output end of the blade assembly. In the second operating state, the speed limiting component slides relative to the output end of the blade assembly. In the third operating state, the speed limiting component is disconnected from the output end of the blade assembly. Through the adaptive adjustment of the three operating states between the speed limiting component and the drive shaft, the speed of the driven shaft can be controlled to prevent generator overload and achieve stable and reliable protection for the generator.

Description

Technical Field

[0001] This application relates to the field of power generation equipment technology, and in particular to a wind turbine speed limiting control device. Background Technology

[0002] Wind turbines convert wind energy into mechanical energy, which drives a rotor to rotate, ultimately generating alternating current (AC). During this process, the rotor speed increases with wind speed. When wind speeds are too high, the rotor speed becomes too fast, potentially causing the generator to overload. Therefore, speed limiting devices are typically used to restrict the rotor speed. A common method is braking, where brake pads compress the rotor's friction to reduce its speed. However, with prolonged use and lack of maintenance, brake pad wear can lead to brake failure. This results in the rotor speed not being properly limited, potentially causing generator overload and damage. Utility Model Content

[0003] Therefore, it is necessary to provide a wind turbine speed limiting control device to address the problem that the conventional braking speed limiting method used in current wind turbine speed limiting control devices is prone to brake failure when not maintained for a long time.

[0004] This application provides a wind turbine speed limiting control device, including a generator set, a blade assembly, and a column. The generator set is mounted on the column and is driven to the blade assembly so that the generator set generates electricity through the rotation of the blade assembly. The generator set includes a speed limiting component and a generator. The output end of the blade assembly is adapted to be driven to the input end of the generator through the speed limiting component, and the speed limiting component and the output end of the blade assembly are adapted to switch between a first working state, a second working state, and a third working state.

[0005] When in the first working state, the speed limiting component presses against the output end of the fan blade assembly, and there is no relative displacement between the speed limiting component and the output end of the fan blade assembly;

[0006] In the second working state, the speed limiting component and the output end of the fan blade assembly are adapted to slide relative to each other;

[0007] When in the third working state, the speed limiting component is disconnected from the output terminal of the fan blade assembly.

[0008] In one embodiment, the speed limiting component includes a driven shaft, the output end of the fan blade assembly is a drive shaft, one end of the driven shaft is connected to the generator for transmission, and the other end of the driven shaft is rotatably connected to the drive shaft.

[0009] In one embodiment, the speed limiting component further includes a transmission sleeve slidably disposed on the driven shaft and adapted to abut against the drive shaft to drive the transmission sleeve to rotate synchronously when the drive shaft rotates.

[0010] In one embodiment, the driven shaft is provided with a limiting protrusion along its radial direction, and an elastic element is provided between the limiting protrusion and the transmission sleeve. The elastic element abuts against the transmission sleeve to drive the transmission sleeve to move toward the drive shaft.

[0011] In one embodiment, the speed limiting component further includes a feedback control unit, which includes a variable diameter control sleeve and a feedback control rod. The variable diameter control sleeve is disposed on the driven shaft, and a contact of the feedback control rod is movably abutting against the outer surface of the variable diameter control sleeve.

[0012] In one embodiment, the outer surface of the variable diameter control sleeve is formed as a cylindrical surface along its axial direction, and the cylindrical surface extends into a conical surface toward the drive shaft, wherein the radius of the conical surface is greater than the diameter of the cylindrical surface.

[0013] In one embodiment, the speed limiting component further includes a speed recognition unit, the speed recognition unit comprising:

[0014] A connecting plate, which is connected to the variable diameter control sleeve;

[0015] A transmission rod, which is rotatably connected to the connecting plate;

[0016] A centrifugal rod, one end of which is connected to the transmission rod, and the other end is equipped with a counterweight ball. The middle bend of the centrifugal rod is rotatably connected to the driven shaft.

[0017] In one embodiment, the fan blade assembly further includes an adjustment cylinder mounted on the housing and slidably connected to the drive shaft.

[0018] In one embodiment, both the adjusting cylinder and the transmission sleeve are provided with grooves along their circumference, and the feedback control rod is adapted to be embedded in the grooves provided on the adjusting cylinder and the transmission sleeve respectively, and to move along the grooves.

[0019] In one embodiment, the fan blade assembly further includes a plurality of fan blades disposed on the adjusting cylinder, and the adjusting cylinder is provided with a plurality of fitting grooves. A pull rod is provided between the fitting groove and the fan blade, and one end of the pull rod is connected to the fan blade, and the other end of the pull rod is slidably connected to the fitting groove.

[0020] In the aforementioned wind turbine speed limiting control device, power is transmitted to the generator set through the cooperation between the speed limiting component and the blade assembly to drive the generator set to generate electricity. The speed limiting component and the blade assembly transmit power through a friction connection. By controlling the connection state between the speed limiting component and the blade assembly, the transmission efficiency of the two can be controlled. The connection between the speed limiting component and the blade assembly can be easily disconnected to achieve the purpose of disconnecting the transmission. This can effectively prevent the brake failure caused by the traditional brake pad deceleration due to long-term lack of maintenance, and the protection of the generator set is more stable and reliable.

[0021] In addition, the speed limiting component can provide speed limiting protection for the generator set and the fan blade assembly through closed-loop regulation, thereby improving the overall protection effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a wind turbine generator device in one embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the blade assembly structure of a wind turbine speed limiting control device in one embodiment of this application;

[0024] Figure 3 This is a cross-sectional view of the generator set structure of a wind turbine speed limiting control device in one embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the generator set structure of a wind turbine speed limiting control device in one embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the speed recognition unit and feedback control unit of a wind turbine speed limiting control device in one embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 101. Column; 102. Housing; 103. Fan blade; 104. Tie rod; 105. Fitting groove; 106. Drive shaft; 107. Adjusting cylinder; 108. Generator; 109. Driven shaft; 110. Feedback control rod; 111. Variable diameter control sleeve; 112. Transmission sleeve; 113. Connecting plate; 114. Elastic element; 115. Centrifugal rod; 116. Counterweight ball; 117. Transmission rod. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] This application provides a wind turbine speed limiting control device. Power is transmitted to the generator set through the cooperation between the speed limiting component and the blade assembly, thereby driving the generator set to generate electricity. By controlling the connection state between the speed limiting component and the blade assembly, the transmission efficiency of both can be controlled to provide speed limiting protection for both the generator set and the blade assembly, thus improving the overall protection effect. Furthermore, the speed limiting component can be easily disconnected from the blade assembly to achieve the purpose of disengaging the transmission, effectively preventing brake failure caused by long-term lack of maintenance in traditional brake pad-type deceleration, and providing more stable and reliable protection for the generator set.

[0033] like Figure 1 As shown, the wind turbine generator 108 speed limiting control device includes a generator set, a fan blade assembly, and a column 101. The generator set is mounted on the column 101 and is connected to the fan blade assembly for transmission, so that the rotation of the fan blade assembly can drive the generator set to generate electricity.

[0034] Specifically, the generator set includes a speed limiting component and a generator 108. The input terminal of the generator 108 can be connected to the output terminal of the fan blade assembly via the speed limiting component. The speed limiting component and the output terminal of the fan blade assembly have three operating states: a first operating state, a second operating state, and a third operating state. These three operating states can be switched according to the connection state between the output terminal of the fan blade assembly and the speed limiting component. In the first operating state, the speed limiting component presses against the output terminal of the fan blade assembly, and there is no relative displacement between them. That is, the rotational speed transmitted from the output terminal of the fan blade assembly to the input terminal of the generator 108 through the speed limiting component remains unchanged, and the two can rotate synchronously. In the second operating state, the speed limiting component and the output end of the fan blade assembly are adapted to slide relative to each other. At this time, since the rotational speed of the fan blade assembly is relatively faster than the speed that the generator 108 can accept, the speed limiting component adaptively controls the pressure between itself and the output end of the fan blade assembly. This causes slippage in the connection between the output end of the fan blade assembly and the speed limiting component. When slippage occurs, the speed limiting component cannot fully transmit the rotational speed output by the fan blade assembly, thereby reducing the input speed of the generator 108 and preventing overload. In the third operating state, the output end of the fan blade assembly is completely disconnected from the speed limiting component. That is, when the output speed of the fan blade assembly is too high and the generator 108 cannot withstand it, the speed limiting component will disconnect from the input end of the fan blade assembly to protect the generator 108 from damage.

[0035] like Figure 3 As shown, the speed limiting component includes a driven shaft 109, and the output end of the fan blade assembly is a drive shaft 106. One end of the driven shaft 109 is connected to the generator 108, so that when the driven shaft 109 rotates, it transmits its rotational speed to the generator 108 to drive the generator 108 to work. The other end of the driven shaft 109 is rotatably connected to the drive shaft 106. That is, when the drive shaft 106 rotates, the driven shaft 109 will not rotate with the drive shaft 106 unless there is another connecting structure connected to the drive shaft 106; the two are in a state of relative rotation. If it is necessary to drive the driven shaft 109 to rotate synchronously through the rotation of the drive shaft 106, then the transmission sleeve 112 included in the speed limiting component is also required.

[0036] Specifically, the transmission sleeve 112 is slidably mounted on the driven shaft 109, and is adapted to abut against the drive shaft 106. Thus, when the drive shaft 106 rotates, the transmission sleeve 112, in contact with the drive shaft 106, rotates with it. Since the transmission sleeve 112 is connected to the driven shaft 109, its rotation with the drive shaft 106 drives the driven shaft 109 to rotate synchronously. This rotation of the driven shaft 109 simultaneously drives the generator 108 to operate. Therefore, through the cooperation between the transmission sleeve 112 mounted on the driven shaft 109 and the drive shaft 106, the rotational speed output by the fan blade assembly can be transmitted, driving the generator 108 to operate.

[0037] More specifically, the driven shaft 109 is further provided with a limiting protrusion along its radial direction. An elastic element 114 (which can be configured as a spring) is provided between the limiting protrusion and the transmission sleeve 112. The elastic element 114 is adapted to abut against the transmission sleeve 112, and when the elastic element 114 abuts against the transmission sleeve 112, it is already compressed. Therefore, under the action of its own elastic force, the elastic element 114 will push the transmission sleeve 112 to move towards the drive shaft 106 until the transmission sleeve 112 presses against the drive shaft 106. At this time, since the elastic element 114 is still in a compressed state, the elastic element 114 also has a pressure on the transmission sleeve 112 to push towards the drive shaft 106. Under this pressure, there is static friction between the transmission sleeve 112 and the drive shaft 106, that is, no relative movement occurs between the transmission sleeve 112 and the drive shaft 106. Therefore, when the drive shaft 106 rotates, it can drive the transmission sleeve 112 to rotate synchronously.

[0038] like Figures 4 to 5As shown, the speed limiting assembly also includes a feedback control unit, which includes a variable diameter control sleeve 111 and a feedback control rod 110. The variable diameter control sleeve 111 is disposed on the driven shaft 109, and one contact of the feedback control rod 110 movably abuts against the outer surface of the variable diameter control sleeve 111. The outer surface of the variable diameter control sleeve 111 is formed as a cylindrical surface along its axial direction, and a conical surface extends from the cylindrical surface toward the drive shaft 106, with the radius of the conical surface being larger than the diameter of the cylindrical surface. Therefore, when one contact of the feedback control rod 110 abuts against the cylindrical surface, the feedback control rod 110 will not move regardless of how the variable diameter control sleeve 111 moves, and at this time, the transmission sleeve 112 and the drive shaft 106 can achieve stable transmission. When the variable diameter control sleeve 111 begins to move significantly, one contact (first contact) of the feedback control rod 110 begins to move from the cylindrical surface to the conical surface. Since the radius of the conical surface is larger than the diameter of the cylindrical surface, the feedback control rod 110 begins to rotate. Under the action of centrifugal force, the other contact (second contact) of the feedback control rod 110 overcomes the elastic force of the elastic element 114 and presses down on the transmission sleeve 112, thereby reducing the pressure of the transmission sleeve 112 on the drive shaft 106 and reducing the friction between the two, causing slippage between the drive shaft 106 and the transmission sleeve 112, so as to reduce the transmission efficiency from the drive shaft 106 to the driven shaft 109, thereby achieving the purpose of reducing the speed of the driven shaft 109.

[0039] In addition, the feedback control lever 110 has a third contact, which is connected to the adjusting cylinder 107 included in the fan blade assembly. The adjusting cylinder 107 is mounted on the housing 102 and is slidably connected to the drive shaft 106. Furthermore, the adjusting cylinder 107 and the ship's dynamic surface both have grooves along their axial direction. The second contact of the feedback control lever 110 is embedded in the groove on the transmission sleeve 112, and the third contact of the feedback control lever 110 is embedded in the groove on the adjusting cylinder 107. Both the second and third contacts of the feedback control lever 110 can move along the path defined by the grooves.

[0040] The speed limiting assembly also includes a speed recognition unit, which includes a connecting plate 113, a transmission rod 117, and a centrifugal rod 115. The connecting plate 113 is connected to the variable diameter control sleeve 111. One end of the transmission rod 117 is rotatably connected to the connecting plate 113. One end of the centrifugal rod 115 is connected to the other end of the transmission rod 117. A counterweight ball 116 is installed at the other end of the centrifugal rod 115, and the middle bend of the centrifugal rod 115 is rotatably connected to the driven shaft 109.

[0041] like Figure 2As shown, the fan blade assembly also includes multiple fan blades 103 mounted on the regulating cylinder 107. The regulating cylinder has multiple fitting slots 105, and each fitting slot 105 is connected to the fan blade 103 by a pull rod 104. One end of the pull rod 104 is connected to the fan blade 103, and the other end of the pull rod 104 is slidably connected to the fitting slot 105.

[0042] In addition, when the rotational speed of the drive shaft 106 is too high, the first contact of the feedback control rod 110 contacts the conical surface of the variable diameter control sleeve 111, causing the second contact to press down the transmission sleeve 112 and the third contact to press down the adjusting cylinder 107. After the adjusting cylinder 107 moves axially, the fitting groove 105 will pull the pull rod 104. Since the fan blade 103 is rotatably connected to the drive shaft 106, the tilt angle of the fan blade 103 will change, thereby reducing the wind force on the windward side of the fan blade 103, thereby reducing the rotational speed of the drive shaft 106, thereby reducing the rotational speed of the driven shaft 109, and at the same time preventing the rotational speed of the drive shaft 106 from increasing further.

[0043] Based on the aforementioned structure of the wind turbine speed limiting control device, when the wind blows the fan blade 103, the windward surface of the fan blade 103 is subjected to force, which drives the drive shaft 106 to rotate. At this time, the drive shaft 106 transmits power to the speed limiting component, and then to the generator 108 for power generation. When the external wind force increases, the force from the wind on the fan blade 103 increases, and the rotational speed of the drive shaft 106 increases. When the rotational speed of the drive shaft 106 reaches a preset value, the speed limiting component controls the friction transmission between the drive shaft 106 and the fan blade. The frictional force begins to decrease until it disconnects. Before disconnection, when the speed limiting component is driven to transmit the speed to the driven shaft 109 via the drive shaft 106, relative sliding will occur between the drive shaft 106 and the speed limiting component as the frictional force decreases. When relative sliding occurs, the speed of the speed limiting component no longer rotates with the drive shaft 106. Therefore, the speed at which the speed limiting component drives the driven shaft 109 to rotate will decrease, and the speed transmitted from the driven shaft 109 to the generator 109 will also decrease accordingly. This can prevent the generator 108 from being damaged by overload.

[0044] In addition, during normal power generation (in the first working state), the spring 114 provides pressure for the transmission sleeve 112 to fit against the drive shaft 106. The drive shaft 106 drives the transmission sleeve 112 using friction, and the transmission sleeve 112 drives the driven shaft 109. The driven shaft 109 transmits power to the generator 108 for power generation. When the driven shaft 109 rotates at normal speed, the centrifugal rod 115 rotates synchronously with the driven shaft 109. At this time, the centrifugal force on the counterweight ball 116 is small, so the swing amplitude of the centrifugal rod 115 is small. As a result, after being pulled by the transmission rod 117 and the connecting plate 113, the variable diameter control sleeve 111 only moves slightly. At this time, one contact of the feedback control rod 110 presses on the cylindrical surface of the variable diameter control sleeve 111, and the feedback control rod 110 will not move no matter how the variable diameter control sleeve 111 moves. Thus, the transmission sleeve 112 and the drive shaft 106 can stably transmit the rotational speed to the generator 108 for power generation.

[0045] When in the second working state, the speed of the drive shaft 106 is too high. The drive shaft 106 transmits the speed to the driven shaft 109 through the transmission sleeve 112, thereby causing the speed of the driven shaft 109 to start to increase. At this time, the rotation of the centrifugal rod 115 increases the centrifugal force on the counterweight ball 116, that is, the swing amplitude of the centrifugal rod 115 increases. At this time, the variable diameter control sleeve 111 begins to move at a larger amplitude, and one contact point (first contact point) of the feedback control rod 110 begins to move from the cylindrical surface to the conical surface. Since the radius of the conical surface is larger than the diameter of the cylindrical surface, the feedback control rod 110 begins to rotate. At this time, the other contact point (second contact point) of the feedback control rod 110 will overcome the elastic force of the spring 114 and press down on the transmission sleeve 112 to reduce the pressure of the transmission sleeve 112 on the drive shaft 106. At the same time, the friction between the transmission sleeve 112 and the drive shaft 106 is reduced, which leads to a decrease in the transmission efficiency from the drive shaft 106 to the driven shaft 109, causing the speed of the driven shaft 109 to begin to decrease. When the speed of the driven shaft 109 decreases, the counterweight ball 116 returns to its original position, causing the transmission sleeve 112 to press against the drive shaft 106 again to transmit the speed to the driven shaft 109, thereby realizing a closed loop.

[0046] When in the third working state, the second contact of the feedback control lever 110 overcomes the elastic force of the spring 114 and presses down on the transmission sleeve 112, thereby reducing the pressure of the transmission sleeve 112 on the drive shaft 106. At the same time, the friction between the transmission sleeve 112 and the drive shaft 106 is reduced until the transmission sleeve 112 and the drive shaft 106 are completely disconnected. At this time, the friction between the two is 0, that is, the transmission sleeve 112 does not transmit the rotational speed to the driven shaft 109, which causes the driven shaft 109 to be unable to rotate, and thus cannot drive the generator 108 to work normally.

[0047] Therefore, in the aforementioned wind turbine speed limiting control device, the speed of the driven shaft 109 can be controlled by adaptively adjusting the three working states between the speed limiting component and the drive shaft 106, thereby preventing overload of the generator 108. Furthermore, by adjusting the connection state between the speed limiting component and the fan blade assembly, the transmission efficiency of both can be controlled, and the connection between the speed limiting component and the fan blade assembly can be easily disconnected to achieve the purpose of disconnecting the transmission when the speed is too high. This effectively prevents the traditional brake pad type deceleration from failing due to long-term lack of maintenance, thus achieving stable and reliable protection for the generator 108. In addition, the speed limiting component can provide speed limiting protection for the generator set and the fan blade assembly through closed-loop adjustment, thereby improving the overall protection effect.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A wind power generator speed limiting control device comprising a generator set, a fan blade set and a stand column, the generator set is arranged on the stand column and is drivingly connected with the fan blade set to generate electricity via rotation of the fan blade set, characterized in that, The generator set includes a speed limiting component and a generator. The output end of the fan blade assembly is adapted to be connected to the input end of the generator via the speed limiting component, and the speed limiting component and the output end of the fan blade assembly are adapted to switch between a first operating state, a second operating state, and a third operating state. When in the first working state, the speed limiting component presses against the output end of the fan blade assembly, and there is no relative displacement between the speed limiting component and the output end of the fan blade assembly; In the second working state, the speed limiting component and the output end of the fan blade assembly are adapted to slide relative to each other; When in the third working state, the speed limiting component is disconnected from the output terminal of the fan blade assembly.

2. The wind turbine speed limiting control device according to claim 1, wherein The speed limiting component includes a driven shaft, the output end of the fan blade assembly is a drive shaft, one end of the driven shaft is connected to the generator for transmission, and the other end of the driven shaft is rotatably connected to the drive shaft.

3. The wind turbine speed limiting control device according to claim 2, characterized in that, The speed limiting component also includes a transmission sleeve, which is slidably disposed on the driven shaft and adapted to abut against the drive shaft so as to drive the transmission sleeve to rotate synchronously when the drive shaft rotates.

4. The wind turbine speed limiting control device according to claim 3, characterized in that, The driven shaft is provided with a limiting protrusion along its radial direction, and an elastic element is provided between the limiting protrusion and the transmission sleeve. The elastic element abuts against the transmission sleeve to drive the transmission sleeve to move toward the driving shaft.

5. The wind turbine speed limiting control device according to claim 3, characterized in that, The speed limiting component also includes a feedback control unit, which includes a variable diameter control sleeve and a feedback control rod. The variable diameter control sleeve is disposed on the driven shaft, and one contact of the feedback control rod is movably in contact with the outer surface of the variable diameter control sleeve.

6. The wind turbine speed limiting control device according to claim 5, characterized in that, The outer surface of the variable diameter control sleeve is formed as a cylindrical surface along its axial direction, and the cylindrical surface extends into a conical surface in the direction of the drive shaft, and the radius of the conical surface is greater than the diameter of the cylindrical surface.

7. The wind turbine speed limiting control device according to claim 5, characterized in that, The speed limiting component further includes a speed recognition unit, the speed recognition unit comprising: A connecting plate, which is connected to the variable diameter control sleeve; A transmission rod, which is rotatably connected to the connecting plate; A centrifugal rod, one end of which is connected to the transmission rod, and the other end is equipped with a counterweight ball. The middle bend of the centrifugal rod is rotatably connected to the driven shaft.

8. The wind turbine speed limiting control device according to claim 5, characterized in that, The fan blade assembly also includes an adjusting cylinder, which is mounted on the housing and is slidably connected to the drive shaft.

9. The wind turbine speed limiting control device according to claim 8, characterized in that, Both the adjusting cylinder and the transmission sleeve have circumferential grooves. The feedback control rod is adapted to be embedded in the grooves on the adjusting cylinder and the transmission sleeve respectively, and to move along the grooves.

10. The wind turbine speed limiting control device according to claim 8, characterized in that, The fan blade assembly also includes multiple fan blades disposed on the regulating cylinder. The regulating cylinder is also provided with multiple fitting grooves. Each fitting groove is provided with a pull rod between it and the fan blade. One end of the pull rod is connected to the fan blade, and the other end of the pull rod is slidably connected to the fitting groove.

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