CN203670115U - Blade variable-pitch limiting structure and wind driven generator - Google Patents

Abstract

The utility model provides a blade pitch limiting structure for a wind turbine and a wind turbine having the blade pitch limiting structure. The blade pitch limiting structure includes a moving block provided on the moving ring of the pitch bearing or the blade flange and a static block provided on the fixed ring of the pitch bearing. When the pitch actuator fails and the blade rotates more than In the normal working angle range, the static stopper contacts the movable stopper to prevent the blade from further rotation. This prevents the blades from spinning out of control in the event of a pitch actuator failure.

Description

Blade pitch limiting structure and wind power generator

technical field

The utility model relates to the technical field of wind power generation, in particular to a position-limiting structure for changing the pitch of a wind-driven generator blade and a wind-driven generator adopting the position-limiting structure.

Background technique

The pitch control system is an important part of the wind turbine. The pitch control system enables the blades to be limited to a certain angle by the pitch actuator according to the requirements of the wind turbine control strategy. In practical applications, the range of the power generation angle can be set between 0° and 5° (that is, the fan normally generates power within the range of the pitch angle), and the range of the feathering stop angle is between 87° and 90°.

Rotary encoders are usually used in wind turbines to detect the actual position of the blades (pitch angle), but due to the importance of the above two positions of the blades, the pitch system is also provided with a pitch limiter for the blades of the wind turbine. Bit function to limit the blades to a certain angle according to the operation needs.

The blade pitch limit function of the existing wind power generator is realized under the condition that the pitch actuator can work normally. The sensor transmits the position information to the pitch control system, and the blade position information is used as the basis for performing the pitch action.

However, during the operation of the wind turbine, there may be faults in the pitch actuator, for example, the brake of the pitch motor fails, the shaft of the pitch gear in the form of gear pitch is broken, and the gear shaft in the form of synchronous toothed belt pitch is broken. The belt is broken, the drive unit in the form of hydraulic pitch is faulty, etc. When these failures occur, not only the fan cannot work normally, but also the blades will be out of control, and the blades will freely rotate 360° around the axis. The normal pitch angle of the blade is generally between 0° and 90°. If the blade turns to an abnormal angle range, it will cause additional damage to other parts. In extreme cases, the tip of the blade will be swept into the tower, causing the blade to break. cause heavy losses. However, the existing pitch limiting structure of the wind turbine blades is not suitable for the situation that the blade angle exceeds the normal range when the pitch actuator fails.

With the development of the wind power industry, higher requirements are put forward for the safety of wind turbines. Although the probability of pitch actuator failure is low, once it occurs, it may cause great damage to the wind turbine.

Utility model content

Therefore, the object of the present utility model is to provide a limiting structure capable of limiting the blades within a specific angle range even when the pitch actuator fails, and a wind generator using the limiting structure.

In addition, the pitch limiting structure of the blade of the present invention also has a locking function, and when the blade is limited to a specific position, the blade can also be locked at that position.

According to one aspect of the present utility model, there is provided a blade pitch limiting structure for a wind power generator, the blade pitch limiting structure includes a moving block arranged on the pitch bearing moving ring or the blade flange As well as the static block arranged on the fixed ring of the pitch bearing, when the pitch actuator breaks down and the blade rotates beyond the normal working angle range, the static block contacts the dynamic block to prevent the blade from further rotating.

The static stopper may have an inclined surface facing the movable stopper, a wedge-shaped space may be formed between the inclined surface and the pitch bearing moving ring or the blade flange, and the movable stopper may have an inclined surface facing the static stopper , when the static block blocks the moving block, the moving block enters the wedge-shaped space and is locked.

The fixed ring of the pitch bearing is the inner ring of the pitch bearing, and the static stop is formed on the inner ring of the pitch bearing.

The fixed ring of the pitch bearing is the outer ring of the pitch bearing, and the static stop is formed on the outer ring of the pitch bearing.

The moving block is an elastic block, and the static block has a rib. When the moving block is blocked by the static block, the moving block is blocked by the rib and cannot move in reverse.

The moving block includes a first moving block and a second moving block arranged at a predetermined angle, the static block is located between the first moving block and the second moving block, and the first moving block and the second moving block both have an inclined surface facing the static block, and the two ends of the surface of the static block facing the brake ring or blade flange are respectively facing the first block and the second block. sloped surface.

The static block includes a first static block and a second static block arranged at a predetermined angle, the dynamic block is located between the first static block and the second static block, and the first static block and the second static block both have inclined surfaces facing the moving block, and the two ends of the surface of the moving block facing the pitch bearing fixed ring are respectively facing the first static block and the second static block sloped surface.

The static block is installed on the pitch bearing fixed ring through bolts.

An elastic pad is arranged on the surface of the static block and/or the movable block.

A cutting opening is formed between the moving block and the pitch bearing moving ring or the blade flange, so that the moving block has elasticity.

According to another aspect of the present invention, there is also provided a wind power generator with the above-mentioned blade pitch limiting structure.

According to the technical solution of the utility model, even in the case of failure of the pitch actuator, the pitch angle of the blades can be limited within a specific range, thereby preventing the damage caused by the uncontrolled rotation of the blades.

Description of drawings

Through the following description of the embodiments in conjunction with the accompanying drawings, the above-mentioned and other purposes and features of the present utility model will become more clear, wherein:

Fig. 1 is a front view of a position-limiting structure for pitching a wind turbine blade according to an exemplary embodiment of the present invention;

Fig. 2 is a partial perspective view of the limiting structure in Fig. 1;

Fig. 3 is a partial enlarged view of the limiting structure of Fig. 1;

Figure 4 shows a partially enlarged view of the blade in a locked state;

Fig. 5 is a front view of a position-limiting structure for pitching a wind turbine blade according to another exemplary embodiment of the present invention;

Fig. 6 shows a partially enlarged view of a blade in a locked state according to another exemplary embodiment.

Detailed ways

The concept of the utility model proposes a position-limiting structure that can still reliably position-limit the blades when the pitch-changing mechanism of the wind power generator fails. The position limiting structure includes a static block arranged on the fixed ring of the pitch bearing and a movable stop arranged on the moving ring (brake ring) of the pitch bearing or the blade flange. When the pitch control mechanism fails and the rotation angle of the blade exceeds the normal working angle range, the movable stopper contacts the static stopper, thereby blocking the further rotation of the blade. As a result, the pitch angle of the blade is restricted within a set range, and the blade is prevented from freely rotating 360°. In addition, a wedge-shaped contact can be formed between the movable stopper and the static stopper, so that braking can be achieved through the wedge-shaped structure, so that the blade is locked at the limit position. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a front view of a wind turbine blade pitch limiting structure according to an exemplary embodiment of the present invention; Figure 2 is a partial perspective view of the limiting structure in Figure 1; Partial enlarged view of the paddle limiting structure; Figure 4 shows a partial enlarged view of the blade in a locked state.

As shown in Figures 1 and 2, the pitch bearing 10 (here the inner ring of the pitch bearing, also called the pitch bearing fixed ring) is fixed and installed on the hub 100 by bolts, and the brake ring 20 (here the pitch ring) The bearing outer ring (also referred to as the pitch bearing moving ring) is rotatably installed on the outer circumference of the pitch bearing 10 . The wind turbine generator blades (not shown) are installed on the brake ring 20 , and the brake ring 20 is driven to rotate relative to the hub 100 through a pitch actuator (not shown), so as to adjust and control the pitch angle of the blades.

In the example shown in Figures 1-4, the blade pitch limiting structure according to the exemplary embodiment of the present invention includes movable stops 21 and 22 protruding from the inner circumferential surface of the brake ring 20, The static block 30 on the paddle bearing 20 is located between the first movable block 21 and the second movable block 22 .

When the pitch actuator fails and the blade rotates clockwise beyond the normal working range and reaches the first limit position, the static stopper 30 blocks the first movable stopper 21 to prevent the blade from further clockwise rotation. When the pitch actuator fails and the blade rotates counterclockwise beyond the normal working range and reaches the second limit position, the static block 30 blocks the second moving block 22 to prevent the blade from further counterclockwise rotation. Therefore, by restricting the rotation of the blades within a set range through the movable stopper and the static stopper, damage caused by the 360-degree free rotation of the blades can be prevented.

As shown in Figures 1-3, the left and right ends of the surface facing the static block 30 and the brake ring 20 are formed as inclined surfaces facing the movable block, so that the outer surface of the static block 30 and the brake ring 20 A wedge-shaped structure is formed between the inner peripheral surfaces. Specifically, wedge-shaped spaces 33 and 34 are formed between the left and right sides of the static block 30 and the brake ring 20 . The outer surfaces of the movable blocks 21 and 22 are inclined surfaces facing the static block 30 . When the movable block 21 or 22 is in contact with the static block 30, the two contact with an inclined surface. When the movable stopper 21 or 22 enters the wedge-shaped space 33, 34 formed between the static stopper 30 and the brake ring 20 under the action of inertia, the movable stopper 21 or 22 is stuck by the self-locking action of the wedge-shaped structure. Live, thereby limiting the free rotation of the blade, as shown in Figure 4.

In order to reduce the impact force, an elastic pad 31 may also be provided on the outer surface of the static block 30 to prevent the rigid collision between the static block 30 and the movable block 21 or 22 . Obviously, the elastic pads can also be arranged on the moving blocks 21 , 22 , or the elastic pads can be arranged on both the static block 30 and the moving blocks 21 , 22 . Rubber, polyurethane, polytetrafluoroethylene and other elastic materials can be used to make elastic pads.

Fig. 5 and Fig. 6 show a blade pitch limiting structure according to another exemplary embodiment of the present invention. As shown in Figure 5 and Figure 6, the movable stopper 21 and 22 can be set to have elasticity, when the movable stopper 21 or 22 is in contact with the static stopper 30, the movable stopper 21 or 22 is compressed, and the impact energy is absorbed . Protrusions can also be provided on the edges of both sides of the static block 30 to form ribs 40 . After the movable stopper enters the wedge-shaped space, the movable stopper rebounds, and the rib 40 can limit the movable stopper in the wedge-shaped space (as shown in FIG. 6 ). The elasticity of the steel can be used to make grooves at the position of the movable stopper, so that the movable stopper has elasticity.

As an example, under the conditions allowed by the blade structure, the movable stoppers 21 and 22 can be integrated with the blade, directly arranged on the blade flange, or fixed on the inner wall of the blade by means of glass fiber reinforced plastic pre-embedding, threaded connection, etc.; the static stopper 30 It can be integrally formed with the pitch bearing 10, and can also be installed on the pitch bearing through bolts connecting the pitch bearing 10 and the hub 100, and fixed relative to the hub.

Normally, the normal pitch range α of the blade is 0°-90°. Figure 1 shows the state of the blade at an angle of 90°. If the structure of the pitch actuator fails, when the clockwise rotation exceeds 90° under the action of wind load or blade eccentric moment, the movable stopper 21 on the left side of the brake ring 20 will contact the left side of the static stopper 30, and when the blade rotates Under the action of inertial force, the movable stopper 21 enters into the wedge-shaped structure between the static stopper 30 and the brake ring 20, and the movable stopper 21 is stuck by the wedge-shaped self-locking action. When the blade rotates counterclockwise beyond 0°, the movable block 22 on the right side of the braking ring 20 contacts the right side of the static block 30 and enters into a wedge-shaped structure to be locked.

The relative positions of the movable stoppers 21, 22 and the axial direction of the blades can be determined according to the angle required for the blades to be limited. For example, near the 90° position, it is required to be able to lock at 100°; near the 0° position, it is required to be able to lock at the -10° position. In this way, the angle range of blade rotation can be limited to -10° to 100° even in the event of failure of the pitch actuator.

For the case where the static block is installed on the pitch bearing through bolts, after the pitch actuator is repaired, the wedge-shaped self-locking contact can be completed by removing the static block, and the blade can regain the control of the pitch system.

Although in the above-mentioned embodiment, there are two moving blocks 21 and 22 arranged on the brake ring, and one static block 30 is arranged on the pitch bearing, but, as an alternative, the A moving block is arranged on the brake ring, and two static blocks are arranged on the pitch bearing. In this case, the two stationary blocks have inclined surfaces facing the moving block, forming a wedge-shaped space with the surface of the brake ring, and the left and right ends of the moving block have inclined surfaces facing the stationary block respectively, Therefore, when contacting with the static stoppers on the left and right sides respectively, it can be locked by the wedge-shaped structure.

In addition, in the above embodiments, the blades are installed on the outer ring 20 of the pitch bearing, however, the blade pitch limiting structure of the present invention is also applicable to the situation where the blades are installed on the inner ring of the pitch bearing. For the case where the blade is installed on the inner ring of the pitch bearing, the brake ring is installed between the blade and the outer ring of the pitch bearing, the movable stopper is set on the outer circumference of the brake ring, and the static stopper is set on the pitch bearing on the outer ring.

The blade pitch limiting structure according to the exemplary embodiment of the present invention has strong versatility and applicability, and can be applied to wind power generators in various pitch forms. In addition, the position-limiting structure has high practical value, and static stoppers and dynamic stoppers can be set without changing the original structure of the wind-driven generator. Therefore, without increasing too much cost, it can significantly Improve the safety and protection of wind turbines. In addition, the position-limiting structure is simple in structure, convenient in installation, reliable in function and simple in maintenance.

Although the exemplary embodiment of the utility model has been described in detail above, those with common knowledge in the technical field to which the utility model belongs can make various embodiments of the utility model without departing from the spirit and scope of the utility model. modifications and variations. However, it should be understood that those modifications and variations will still fall within the spirit and scope of the exemplary embodiments of the present invention as defined by the claims.

Claims (11)

1. the vane propeller-changing limit structure for wind-driven generator, it is characterized in that, described vane propeller-changing limit structure comprises and is arranged on the moving block on pitch variable bearings moving-coil or blade flange and is arranged on the quiet block on pitch variable bearings retainer ring, break down and blade rotary while exceeding normal operating angle scope when Bian Jiang actuator, quiet block contacts and stops blade to be further rotated with moving block.

2. vane propeller-changing limit structure as claimed in claim 1, it is characterized in that, described quiet block has the inclined surface towards moving block, between described inclined surface and pitch variable bearings moving-coil or blade flange, form wedge shape space, and described moving block has the inclined surface towards quiet block, in the time that quiet block stops moving block, described moving block enters described wedge shape space and locked.

3. vane propeller-changing limit structure as claimed in claim 1, is characterized in that, described pitch variable bearings retainer ring is pitch variable bearings inner ring, and described quiet block is formed on pitch variable bearings inner ring.

4. vane propeller-changing limit structure as claimed in claim 1, is characterized in that, described pitch variable bearings retainer ring is pitch variable bearings outer ring, and described quiet block is formed on pitch variable bearings outer ring.

5. vane propeller-changing limit structure as claimed in claim 1, is characterized in that, described moving block is elastomer block, and described quiet block has rib, and in the time that moving block is stopped by quiet block, described moving block is blocked by described rib, and can not oppositely move.

6. the vane propeller-changing limit structure as described in any one in claim 1-5, it is characterized in that, described moving block comprises the first moving block and the second moving block that interval predetermined angle arranges, described quiet block is between the first moving block and the second moving block, the described first moving block and the second moving block all have the inclined surface towards quiet block, and the surperficial two ends that described quiet block and brake hoop or blade flange are faced are mutually respectively towards the inclined surface of the first block and the second block.

7. the vane propeller-changing limit structure as described in any one in claim 1-5, it is characterized in that, described quiet block comprises the first quiet block and the second quiet block that interval predetermined angle arranges, described moving block is between the first quiet block and the second quiet block, described the first quiet block and the second quiet block all have the inclined surface towards moving block, and the surperficial two ends that described moving block and pitch variable bearings retainer ring are faced are mutually respectively towards the inclined surface of the first quiet block and the second quiet block.

8. the vane propeller-changing limit structure as described in any one in claim 1-5, is characterized in that, described quiet block is arranged on pitch variable bearings retainer ring by bolt.

9. the vane propeller-changing limit structure as described in any one in claim 1-5, is characterized in that, on the surface of described quiet block and/or moving block, is provided with cushion.

10. vane propeller-changing limit structure as claimed in claim 5, is characterized in that, between described moving block and pitch variable bearings moving-coil or blade flange, is formed with cutting mouth.

11. 1 kinds of wind-driven generators, is characterized in that, described wind-driven generator has the vane propeller-changing limit structure as described in any one in claim 1-10.

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