Wind turbine generator set overspeed galloping protection system and wind turbine generator set

Abstract

The utility model discloses a wind turbine generator set overspeed galloping protection system and a wind turbine generator set, and relates to the technical field of wind power generation. The wind turbine generator overspeed galloping protection system comprises a blade root connecting rod and a blade tip sleeve, the blade root connecting rod is inserted into the blade tip sleeve in the first direction, and a spiral stop block and a locking structure are fixedly arranged on the outer side face of the blade root connecting rod; the blade root connecting rod and the blade tip sleeve are matched in a clamped and / or inserted mode through a limiting structure so that the blade root connecting rod and the blade tip sleeve can synchronously rotate around a preset axis extending in the second direction, and the limiting structure comprises a speed limiting block fixed to the inner side face of the blade tip sleeve. The blade tip sleeve can overcome the constraint of the limiting structure and move relative to the blade root connecting rod, and the speed limiting block can abut against the spiral stop block in the first direction and is attached to the spiral stop block to spirally move to the locked structure lock, so that the blade can provide aerodynamic resistance to decelerate, and overspeed operation of the wind turbine generator can be more reliably avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, in particular to an overspeed protection system for a wind turbine set and a wind turbine set. Background Art

[0002] At present, the demand for energy is increasing day by day, while traditional energy is becoming increasingly exhausted, and the wind power industry is ushering in rapid development. Among them, during the operation of wind turbines, when the wind turbines are running at overspeed, the wind turbines need to be shut down to ensure the safe operation of the equipment.

[0003] In an existing overspeed control method, the overspeed sensor and the main control PLC are used together. When the overspeed sensor detects that the main shaft is overspeeding, the main control PLC will be given an "emergency stop" command, and the wind turbine will stop with the blades straightened. However, due to the instability of the electronic control system and the complex causes of failure, the industry frequently encounters accidents such as wind turbine overspeed, runaway, and fire and tower collapse caused by failure of the electronic control system.

[0004] Therefore, how to more reliably avoid overspeeding of wind turbines is a technical problem that those skilled in the art need to solve at present. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a wind turbine overspeed protection system and a wind turbine, which can more reliably prevent the wind turbine from overspeeding.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A wind turbine overspeed protection system comprises a mechanical overspeed protection component, the mechanical overspeed protection component comprises a blade root connecting rod and a blade tip sleeve, the blade root connecting rod is plugged into the blade tip sleeve along a first direction, a spiral stopper is fixedly arranged on the outer side surface of the blade root connecting rod and a locking structure is arranged; the blade root connecting rod and the blade tip sleeve are clipped and / or plug-in matched by a limiting structure, so that the blade root connecting rod and the blade tip sleeve can rotate synchronously around a preset axis extending along a second direction, the limiting structure comprises a speed limiting block fixed to the inner side surface of the blade tip sleeve, when the rotation speed is greater than the preset rotation speed, the blade tip sleeve can overcome the constraint of the limiting structure and move relative to the blade root connecting rod, wherein the speed limiting block can be against the spiral stopper in the first direction, and spirally move in accordance with the spiral stopper until it is locked by the locking structure.

[0008] Preferably, the locking structure includes an elastic card block and a locking block, and the elastic card block and the locking block are arranged on one side surface of the spiral block in the first direction; during the movement of the speed limiting block against the spiral block, the elastic card block can be pressed and moved toward the locking block, and then clamped and locked by the locking block and the reset elastic card block.

[0009] Preferably, the limiting structure includes a rotation limiting key fixed on the outer side surface of the blade root connecting rod, and a rotation limiting groove opened on the inner side surface of the blade tip sleeve; the rotation limiting key and the rotation limiting groove can be plugged into and matched along the first direction to prevent the blade tip sleeve from rotating relative to the blade root connecting rod; when the rotation speed is greater than the preset rotation speed, the rotation limiting groove can slip off the rotation limiting key along the first direction.

[0010] Preferably, the limiting structure includes a limiting groove opened on the blade root connecting rod, and the speed limiting block is clamped in the limiting groove to prevent the blade tip sleeve and the blade root connecting rod from moving relative to each other along the first direction; when the rotation speed is greater than the preset rotation speed, at least one of the speed limiting block and the blade root connecting rod is deformed to allow the speed limiting block to escape from the limiting groove and then move in contact with the spiral stopper.

[0011] Preferably, the limiting groove is an annular groove.

[0012] Preferably, the speed limiting block and the blade root connecting rod are made of the same material.

[0013] Preferably, the cross section of the limiting groove parallel to the first direction is an arc.

[0014] Preferably, it also includes an electronically controlled overspeed protection component, which includes an overspeed sensor and a controller electrically connected to the overspeed sensor; when the rotation speed is greater than a preset rotation speed, the controller controls the blade feathering brake.

[0015] A wind turbine generator system comprises a blade, wherein the blade comprises a blade root, a blade tip and any one of claims 1 to 4, wherein the blade root and the blade tip are arranged in sequence along the first direction, the blade tip sleeve is connected to one end of the blade tip in the first direction, and one end of the blade root in the first direction is set as the blade root connecting rod.

[0016] Preferably, the length ratio of the blade tip to the blade in the first direction is not less than 0.25.

[0017] The utility model provides a wind turbine overspeed protection system, including a mechanical overspeed protection component, which includes a blade root connecting rod and a blade tip sleeve. The blade root connecting rod is plugged into the blade tip sleeve along a first direction, and a spiral stopper is fixedly arranged on the outer side of the blade root connecting rod and a locking structure is arranged; the blade root connecting rod and the blade tip sleeve are clipped and / or plug-in matched by a limiting structure, so that the blade root connecting rod and the blade tip sleeve can rotate synchronously around a preset axis extending along a second direction, and the limiting structure includes a speed limiting block fixed to the inner side of the blade tip sleeve, and when the rotation speed is greater than the preset rotation speed, the blade tip sleeve can overcome the constraint of the limiting structure and move relative to the blade root connecting rod, wherein the speed limiting block can be against the spiral stopper in the first direction, and spirally move in accordance with the spiral stopper until it is locked by the locking structure.

[0018] The wind turbine overspeed protection system in the utility model can directly apply centrifugal force to achieve overspeed protection even without the help of electronic components. When overspeeding and the centrifugal force is large, the blade tip sleeve can passively move relative to the blade root connecting rod and then be locked by the locking structure, so that the blade can provide aerodynamic resistance for deceleration. This can ensure that even if the electronic control system fails, the lift source of the wind turbine can be blocked mechanically in time, and the wind turbine is forced to stop by the aerodynamic lift-to-drag ratio, which can more reliably prevent the wind turbine from overspeeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A top view of a specific embodiment 1 of the wind turbine overspeed protection system provided by the utility model;

[0021] Figure 2 This is a front view of the wind turbine overspeed protection system provided by the utility model when the blades are operating normally in the specific embodiment 1;

[0022] Figure 3 This is a front view of a specific embodiment 1 of the wind turbine overspeed protection system provided by the utility model when the blade is running at an overspeed, wherein the blade tip is relative to Figure 2 The blade tip in the middle rotates a certain angle;

[0023] Figure 4 This is a front view of the blade root connecting rod in the specific embodiment 1 of the wind turbine overspeed protection system provided by the utility model;

[0024] Figure 5 It is a cross-sectional view of a blade tip sleeve in a specific embodiment 1 of the wind turbine overspeed protection system provided by the utility model;

[0025] Figure 6 It is a side view of the blade tip sleeve in the specific embodiment 1 of the wind turbine overspeed protection system provided by the utility model;

[0026] Figure 7 This is an assembly diagram of the blade root connecting rod and the blade tip sleeve in the specific embodiment 1 of the wind turbine overspeed protection system provided by the utility model when the blade is operating normally;

[0027] Figure 8 for Figure 7 A schematic diagram of a blade in overspeed operation and a blade tip sleeve moving relative to a blade root connecting rod in a first direction;

[0028] Fig. 9 for Figure 8 Schematic diagram of the blade in the figure when the speed limit block moves in contact with the spiral stopper;

[0029] Fig.10 for Fig. 9 Schematic diagram of the speed limit block pressing the elastic block;

[0030] Fig.11 for Fig.10 Schematic diagram of the speed limit block being locked by the elastic clamp block and the locking block;

[0031] Fig.12 This is a control logic diagram of the wind turbine set provided by the utility model when it is running at overspeed.

[0032] Reference numerals:

[0033] First direction X, second direction Y, preset center line S, preset axis O, maximum output section M of blade;

[0034] Blade 1, blade root 11, blade tip 12, leading edge 13, trailing edge 14;

[0035] Blade tip sleeve 2, speed limiting block 21, rotation limiting groove 22;

[0036] Blade root connecting rod 3, limiting groove 31, rotation limiting key 32, spiral stopper 33, locking block 34, elastic clamping block 35. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] The core of the utility model is to provide a wind turbine set overspeed protection system and a wind turbine set, which can more reliably prevent the wind turbine set from overspeeding.

[0039] The wind turbine (hereinafter referred to as wind turbine) overspeed protection system provided by the utility model is applied to the wind turbine. In the specific embodiment 1, please refer to Figures 1 to 12 The wind turbine overspeed protection system includes a mechanical overspeed protection component. Figure 1 and Figure 2 As shown, the blade 1 includes a blade root 11 and a blade tip 12 arranged in sequence along a first direction X, and the blade root 11 and the blade tip 12 are connected by a mechanical overspeed protection component. When the wind turbine is running, the blade 1 rotates around a preset axis O parallel to the second direction Y (along Figure 2 The blade tip 12 is located on both sides of the blade root 11 in the first direction X. Optionally, the first direction X is perpendicular to the second direction Y, or may be at other nearly perpendicular angles.

[0040] The mechanical overspeed protection assembly comprises a blade root connecting rod 3 and a blade tip sleeve 2, wherein the blade root connecting rod 3 is plugged into the blade tip sleeve 2 along a first direction X, wherein Figure 4 and Figure 5 As shown, the blade root connecting rod 3 is used to be fixed to one end of the blade root 11 in the first direction X, and the blade tip sleeve 2 is used to be fixed to one end of the blade tip 12 in the first direction X.

[0041] The blade root connecting rod 3 and the blade tip sleeve 2 are clamped and / or plug-in fitted through a limiting structure so that the blade root connecting rod 3 and the blade tip sleeve 2 can rotate synchronously around a preset axis O extending along the second direction Y. Specifically, when the rotational speed of the blade 1 and the blade root connecting rod 3 and the blade tip sleeve 2 thereon relative to the preset axis O does not exceed the preset rotational speed, the blade root connecting rod 3 and the blade tip sleeve 2 perform the above-mentioned synchronous rotation under the constraint of the limiting structure.

[0042] like Figure 4 As shown, a spiral stopper 33 is fixedly arranged on the outer side of the blade root connecting rod 3 and a locking structure is arranged. The limiting structure includes a speed limiting block 21 fixed to the inner side of the blade tip sleeve 2. Figures 9 to 11As shown, when the rotational speed of the blade 1 and the blade root connecting rod 3 and the blade tip sleeve 2 thereon relative to the preset axis O is greater than the preset rotational speed, the blade tip sleeve 2 can overcome the constraint of the limiting structure and move relative to the blade root connecting rod 3. During this process, the speed limit block 21 can abut against the spiral stopper 33 in the first direction X, and move spirally in accordance with the spiral stopper 33 until it is locked by the locking structure, so that after the blade tip 12 rotates synchronously with the blade tip sleeve 2 relative to the blade root 11 and the blade root connecting rod 3, the blade 1 continues to rotate around the preset axis O at a reduced speed in this state.

[0043] Among them, Figure 4 As shown, the spiral stopper 33 is a stopper protruding from the outer side of the blade root connecting rod 3 and extending around a preset center line S, and the preset center line S is parallel to the first direction X. Optionally, the circular angle of the spiral stopper 33 relative to the preset center line S can be between 80° and 90°, or a larger angle, preferably ensuring that the blade tip 12 rotates 80 to 90° relative to the blade root 11 in the process from being constrained by the limiting structure to being locked by the locking structure, so as to generate aerodynamic resistance.

[0044] When the wind turbine overspeed protection system in this embodiment is applied to the wind turbine, the preset rotating shaft is the rotating shaft of the blade 1. When the rotation speed of the blade 1 exceeds the preset speed, that is, when the wind turbine is overspeeding, there is also a large centrifugal force between the blade tip sleeve 2 and the blade root connecting rod 3, which can overcome the mechanical constraints such as the clamping force, plug-in force, and friction force of the limiting structure on the blade tip sleeve 2 and the blade root connecting rod 3. The blade tip sleeve 2 can move relative to the blade root connecting rod 3, and accordingly, the blade tip 12 performs the same movement relative to the blade root 11. Among them, under the cooperation and guidance of the speed limit block 21 and the spiral spiral stopper 33, the blade tip sleeve 2 can rotate a certain angle relative to the blade root connecting rod 3 while moving along the first direction X, and drive the blade tip 12 to rotate a certain angle relative to the blade root 11, thereby increasing the resistance of the blade 1, making the resistance of the entire blade 1 greater than the lift and slowing down, thereby avoiding the occurrence of overspeeding tower collapse accidents.

[0045] It can be seen that the protection system in this embodiment can directly apply centrifugal force to achieve speeding protection even without the help of electronic components. When overspeeding and the centrifugal force is large, the tip sleeve 2 can passively move relative to the blade root connecting rod 3 and then be locked by the locking structure, so that the blade 1 can provide aerodynamic resistance for deceleration. This can ensure that even if the electronic control system fails, the lift source of the wind turbine can be blocked in time by mechanical means, and the wind turbine can be forced to stop by the aerodynamic lift-to-drag ratio, which can more reliably prevent the wind turbine from overspeeding.

[0046] Furthermore, if Figures 8 to 11As shown, the locking structure includes an elastic card block 35 and a locking block 34, and the elastic card block 35 and the locking block 34 are arranged on a side surface of the spiral block 33 in the first direction X. When the speed limit block 21 moves in contact with the spiral block 33, the elastic card block 35 can be pressed and moved toward the locking block 34, and then clamped and locked by the locking block 34 and the reset elastic card block 35. At this time, the elastic card block 35 cannot be pressed down by the reverse movement of the locking block 34.

[0047] Optionally, the elastic block 35 includes a block slidably connected to the slide groove of the spiral block 33 and a spring located in the slide groove. The speed limit block 21 can overcome the elastic force of the spring and press the block into the slide groove to continue to fit the spiral block 33 through the block. Fig.11 As shown, the spring can eject the card block out of the slide slot for reset.

[0048] Among them, optionally, a guide slope can be set on the side of the elastic block 35 facing away from the locking block 34, and the guide slope is inclined relative to the direction in which the speed limit block 21 fits the spiral stopper 33, so that the speed limit block 21 presses the elastic block 35; and the side of the elastic block 35 facing the locking block 34 is roughly perpendicular to the direction in which the speed limit block 21 fits the spiral stopper 33 to improve the locking effect of the speed limit block 21.

[0049] Furthermore, if Figures 5 to 8 As shown, the limiting structure includes a rotation-limiting key 32 fixed on the outer side of the blade root connecting rod 3, and a rotation-limiting groove 22 provided on the inner side of the blade tip sleeve 2. The rotation-limiting key 32 and the rotation-limiting groove 22 can be plugged and matched along the first direction X to prevent the blade tip sleeve 2 from rotating relative to the blade root connecting rod 3. The rotation-limiting structure is reliable and has a simple structure. Figure 8 As shown, when the rotation speed of the blade 1 relative to the preset axis O is greater than the preset rotation speed, the rotation limiting groove 22 can slide off the rotation limiting key 32 along the first direction X.

[0050] Among them, Figure 6 As shown, a plurality of rotation limiting grooves 22 are evenly arranged around the preset center line S, for example, four, to improve the reliability of the rotation limiting. Accordingly, the rotation limiting keys 32 are arranged one-to-one with the rotation limiting grooves 22.

[0051] Furthermore, if Figure 7 and Figure 8 As shown, the limiting structure includes a limiting groove 31 provided on the blade root connecting rod 3, and the speed limiting block 21 is connected to the limiting groove 31 to prevent the blade tip sleeve 2 and the blade root connecting rod 3 from moving relative to each other in the first direction X, thereby ensuring the reliability of limiting in the first direction X. When the rotation speed of the blade 1 relative to the preset axis O is greater than the preset rotation speed, at least one of the speed limiting block 21 and the blade root connecting rod 3 is deformed, that is, the speed limiting block 21 is disengaged from the limiting groove 31 and then moves in contact with the spiral stopper 33. Optionally, the limiting groove 31 is an annular groove for easy assembly.

[0052] In addition, optionally, the speed limit block 21 and the blade root connecting rod 3 are made of the same material, which can ensure that the material strength of the blade root connecting rod 3 and the speed limit block 21 is substantially the same, and when overspeeding, it can be avoided that the speed limit block 21 is severely compressed and deformed and loses the contact ability with the spiral stopper 33. In addition, the cross section of the limiting groove 31 parallel to the first direction X is an arc, and in the first direction X, the limiting groove 31 is in an inclined state, which can enable the speed limit block 21 to gradually overcome the resistance of the limiting groove 31 to disengage.

[0053] Of course, in other embodiments, the speed limit block 21 may also adopt an elastic structure, and when the centrifugal force is large enough, it can be separated from the limiting groove 31 through elastic deformation. Alternatively, a positioning groove may be provided on the blade root connecting rod 3 to cooperate with the speed limit block 21 to achieve the rotation limit and movement limit of the blade tip sleeve 2 relative to the blade root connecting rod 3.

[0054] Furthermore, the wind turbine overspeed protection system also includes an electronically controlled overspeed protection component, which includes an overspeed sensor and a controller electrically connected to the overspeed sensor. When the rotation speed of the blade 1 relative to the preset axis O is greater than the preset rotation speed, the controller controls the blade 1 to brake. Among them, the overspeed sensor can specifically detect the movement speed of the blade 1 and the main shaft of the impeller. In addition, the controller specifically includes the wind turbine main engine control core PLC and the variable pitch control center PMC in the wind turbine.

[0055] In practical applications, the mechanical overspeed protection component can be used alone, or, as in this embodiment, a mechanical overspeed protection component can be added to an existing wind turbine with an electronically controlled overspeed protection component, which is equivalent to adding a set of mechanical insurance to the electronically controlled wind turbine overspeed protection control logic. Fig.12 As shown in the figure, regardless of whether the overspeed sensor detects the overspeed situation or not, and whether the wind turbine host control core PLC sends a pitch signal to the pitch control center PMC, the wind turbine can be guaranteed to brake and stop in time under the protection of the mechanical overspeed protection component. At this time, the mechanical overspeed protection component mechanically blocks the lift source of the wind turbine set and forces the wind turbine to stop through the aerodynamic lift-to-drag ratio.

[0056] The protection system in this embodiment uses the unique aerodynamic characteristics of the blade 1 to stop the entire blade 1 through pneumatic braking. The specific working principle includes: the blade 1 rotates around the preset axis O. When the speed is within the normal working range, the blade tip 12 is simultaneously subject to the axial limit of the speed limit block 21 and the radial limit of the rotation limit key 32 (the first direction X is used as the axial direction here), and maintains stable operation. The blade tip 12 moves synchronously with the blade root 11 and will not fall off the blade root 11. When the wind wheel speed exceeds the speed limit, the speed limit block 21 will deform to break free from the limit of the limit groove 31, and slide away from the preset axis O on the blade root connecting rod 3 under the action of centrifugal force until it contacts the spiral block 33. The speed limit block 21 continues to rotate against the spiral block 33. Figures 9 to 11 As shown, when the speed limit block 21 of the blade tip 12 passes through the movable elastic block 35, the elastic block 35 is pressed down. After passing through the elastic block 35, the elastic block 35 pops up, and the elastic block 35 and the locking block 34 clamp the speed limit block 21, so that the speed limit block 21 will not slide back in the reverse direction, and the blade root 11 and the rotated blade tip 12 are locked. Figure 3 As shown, the blade 1 continues to rotate around the preset axis O at a reduced speed in the locked state, ensuring that the leading edge 13 (or trailing edge 14) of the blade tip 12 faces the wind when braking, and the pitch angle is greater than or equal to 90°, thereby solving the problem of wind turbine overspeed and runaway caused by frequent failure of the electric control system, thereby causing fire and tower collapse. In addition, after each use of the protection system, since the mechanical overspeed protection component may be destructively deformed or difficult to reset, the blade root connecting rod 3 and the blade tip sleeve 2 in the blade 1 of the wind turbine can be replaced, or the blade 1 can be replaced as a whole, so that the wind turbine can be used again.

[0057] In addition to the above-mentioned wind turbine overspeed protection system, the utility model also provides a wind turbine, which includes a wind turbine overspeed protection system. The wind turbine overspeed protection system can specifically be the wind turbine overspeed protection system provided in any of the above embodiments, and the beneficial effects can be referred to the above embodiments accordingly.

[0058] Specifically, the wind turbine generator set includes an impeller, the impeller includes a main shaft and a blade 1 connected to the main shaft, and the preset axis O is located on the main shaft. The blade 1 includes a blade root 11 and a blade tip 12, and the blade tip 12 and the main shaft are respectively located on both sides of the blade root 11. The blade root 11 and the blade tip 12 are arranged in sequence along a first direction X, the blade tip sleeve 2 is connected to one end of the blade tip 12 in the first direction X, and one end of the blade root 11 in the first direction X is set as a blade root connecting rod 3.

[0059] In addition, in this field, current wind turbines are basically lift-type wind turbines, which rely on the lift-to-drag ratio of each cross-section blade element in the blade 1 to provide lift, and change the installation angle according to the overall pitch of the blade, thereby changing the lift and drag of each blade element, and finally achieving the final effect of controlling the output of the blade 1. Among them, during the operation of the wind turbine, the output of the blade 1 is not evenly distributed on the length of the blade 1 in the first direction X. Generally, in the first direction X, the maximum output point appears at 75% of the length of the blade (the ratio of the distance from the preset axis O to the length of the blade in the first direction X), such as Figure 2 As shown in the figure, the portion of the blade 75% and further away from the preset axis O is the maximum output section M of the blade. The propeller of the maximum output section M of the blade, which is the main output part, will make the resistance of the entire blade much greater than the lift. At this time, the blade will slow down due to aerodynamic reasons, thereby avoiding the occurrence of speeding and tower collapse accidents.

[0060] Optionally, the length ratio of the blade tip 12 to the blade in the first direction X is not less than 0.25. At this time, the maximum output point can be located on the blade tip 12 to ensure that the entire blade can be stopped by the pneumatic brake.

[0061] It should be noted that when an element is referred to as "fixed" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element in the middle at the same time. In addition, in the description of the present utility model, unless otherwise specified, "multiple", "multiple roots", and "multiple groups" mean two or more.

[0062] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the 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 position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0064] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] The wind turbine overspeed protection system and wind turbine provided by the utility model are introduced in detail above. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A wind turbine overspeed protection system, It is characterized in that The invention comprises a mechanical overspeed protection component, the mechanical overspeed protection component comprising a blade root connecting rod (3) and a blade tip sleeve (2), the blade root connecting rod (3) being plugged into the blade tip sleeve (2) along a first direction (X), and a spiral stopper (33) being fixedly arranged on the outer side surface of the blade root connecting rod (3) and a locking structure; The blade root connecting rod (3) and the blade tip sleeve (2) are engaged by means of a limiting structure, such that the blade root connecting rod (3) and the blade tip sleeve (2) can rotate synchronously around a preset axis (O) extending along a second direction (Y); the limiting structure comprises a speed limiting block (21) fixed to an inner side surface of the blade tip sleeve (2); when the rotation speed is greater than a preset rotation speed, the blade tip sleeve (2) can overcome the constraint of the limiting structure and move relative to the blade root connecting rod (3); wherein the speed limiting block (21) can abut against the spiral stopper (33) in the first direction (X) and fit the spiral stopper (33) to spirally move until it is locked by the locking structure.

2. The wind turbine overspeed protection system according to claim 1, It is characterized in that The locking structure comprises an elastic clamping block (35) and a locking block (34), wherein the elastic clamping block (35) and the locking block (34) are arranged on a side surface of the spiral stopper (33) in the first direction (X); when the speed limiting block (21) moves in contact with the spiral stopper (33), the elastic clamping block (35) can be pressed and moved toward the locking block (34), and then clamped and locked by the locking block (34) and the reset elastic clamping block (35).

3. The wind turbine overspeed protection system according to claim 1, It is characterized in that The limiting structure comprises a rotation limiting key (32) fixed on the outer side surface of the blade root connecting rod (3), and a rotation limiting groove (22) provided on the inner side surface of the blade tip sleeve (2); the rotation limiting key (32) and the rotation limiting groove (22) can be plugged together along the first direction (X) to prevent the blade tip sleeve (2) from rotating relative to the blade root connecting rod (3); when the rotation speed is greater than a preset rotation speed, the rotation limiting groove (22) can slide off the rotation limiting key (32) along the first direction (X).

4. The wind turbine overspeed protection system according to any one of claims 1 to 3, It is characterized in that The limiting structure comprises a limiting groove (31) formed on the blade root connecting rod (3); the speed limiting block (21) is engaged with the limiting groove (31) to prevent the blade tip sleeve (2) and the blade root connecting rod (3) from moving relative to each other along the first direction (X); when the rotation speed is greater than a preset rotation speed, at least one of the speed limiting block (21) and the blade root connecting rod (3) is deformed to enable the speed limiting block (21) to escape from the limiting groove (31) and then move in contact with the spiral stopper (33).

5. The wind turbine overspeed protection system according to claim 4, It is characterized in that The limiting groove (31) is an annular groove.

6. The wind turbine overspeed protection system according to claim 4, It is characterized in that The speed limiting block (21) and the blade root connecting rod (3) are made of the same material.

7. The wind turbine overspeed protection system according to claim 4, It is characterized in that The cross section of the limiting groove (31) parallel to the first direction (X) is an arc.

8. The wind turbine overspeed protection system according to any one of claims 1 to 3, It is characterized in that It also includes an electronically controlled overspeed protection component, which includes an overspeed sensor and a controller electrically connected to the overspeed sensor; when the rotation speed is greater than a preset rotation speed, the controller controls the blade (1) to perform a feathering brake.

9. A wind turbine generator set, It is characterized in that The invention comprises a blade, wherein the blade (1) comprises a blade root (11), a blade tip (12) and a wind turbine overspeed protection system according to any one of claims 1 to 8, wherein the blade root (11) and the blade tip (12) are arranged in sequence along the first direction (X), the blade tip sleeve (2) is butt-jointed to one end of the blade tip (12) in the first direction (X), and one end of the blade root (11) in the first direction (X) is set as the blade root connecting rod (3).

10. The wind turbine generator set according to claim 9, It is characterized in that The length ratio of the blade tip (12) to the blade in the first direction (X) is not less than 0.25.

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