WO2009059491A1

WO2009059491A1 - A flexible variable paddle mechanism of a wind power generator

Info

Publication number: WO2009059491A1
Application number: PCT/CN2008/000734
Authority: WO
Inventors: Guangshun Wang; Xuelin Wang
Original assignee: Guangshun Wang; Xuelin Wang
Priority date: 2007-11-07
Filing date: 2008-04-10
Publication date: 2009-05-14
Also published as: CN101429926B; CN101429926A

Abstract

A flexible variable paddle mechanism of a wind power generator includes a wind wheel (2) mounted in front of a spindle (1) and multiple blades (3) mounted on the wind wheel (2). A blade shaft (4) securely connected to the bottom of each blade (3) is inserted in the wind wheel (2) by means of bearings, and a coil spring (5) is sleeved on the blade shaft (4). A synchronizer (51) is securely installed in the center of the wind wheel (2), which includes a housing and a synchro shaft (6) mounted in the housing by means of bearings. The axis of the synchro shaft (6) coincides with the axis of the spindle (1), the synchro shaft (6) has a synchro bevel gear (7) thereon, a tail end of the blade shaft (4) extends through the housing of the synchronizer (51), and on the tail end is fixed a blade shaft bevel gear (8) which engages with the synchro bevel gear (7). The synchronizer (51) can synchronously adjust multiple synchronized blades (3).

Description

Wind turbine flexible pitch mechanism

The invention relates to an adjusting mechanism of a wind power generator, in particular to a flexible pitching mechanism of a wind power generator. Background technique

As a clean and renewable energy source, wind energy is receiving more and more attention from all countries in the world. It has a huge amount of energy, and the global wind energy is about 2.74xl09MW, and the available wind energy is 2xl07MW, which is 10 times larger than the total amount of water energy that can be developed on the earth. With the development of the global economy, the wind energy market has also developed rapidly. Wind turbines use wind energy to drive the blades to drive the main shaft. When the stator and rotor are displaced relative to each other, the magnetic lines of force are cut and a current is generated in the coil. A serious test for wind turbines is to face unstable wind speeds. The winds in nature are changing rapidly. The wind speed span is very large. The requirements for wind turbines are still able to generate electricity normally within the maximum wind speed range. In order to cope with the impact of high winds, the existing wind turbines usually adopt the following three methods: 1. Braking; When the wind speed is too high, the braking motor spindle is used to reduce the speed. Although this method is simple and feasible, it has a great damage to the fan. The fan has to bear a large wind pressure, and it is easy to break the blade, and the fan will be blown down seriously. 2. Side deflection; When the wind speed is too high, the windward side of the fan is biased to one side to reduce the wind pressure on the front side. This method is usually used for small wind turbines. Due to their large size and large inertia, large wind turbines cannot adapt to frequent wind direction changes. 3. Pitching; when the wind speed is too high, the pitch angle of the blade is changed by the pitch mechanism, thereby changing the wind pressure of each blade. This method is best suited for large wind turbines. Existing wind turbine pitching mechanisms generally have the defects of complicated structure, high failure rate, and difficulty in adjustment and maintenance. Summary of the invention

The object of the present invention is to provide a flexible pitching mechanism for a wind power generator which has a simple structure, a low failure rate, and convenient adjustment and maintenance.

In order to achieve the above object, the present invention adopts the following technical solutions:

The flexible pitching mechanism of the wind power generator according to the present invention comprises a wind wheel installed at the front end of the main shaft and a blade mounted on the wind wheel, wherein: the blade shaft fixedly connected to the lower end of the blade is inserted into the wind through the bearing On the wheel, the leaf shaft is provided with a coil spring; the center of the wind wheel is fixedly equipped with a synchronizer, and the synchronizer comprises a casing and a synchronous shaft mounted in the casing through a bearing, and the synchronous shaft coincides with the axis of the main shaft, and the synchronous shaft carries Synchronous bevel gear, the end of the leaf shaft passes through the outer casing of the synchronizer and is fixedly mounted with a leaf bevel gear, a synchronous bevel gear and The leaf shaft bevel gear meshes.

The worm wheel is also mounted on the blade shaft through the bearing, and the worm gear matched with the worm wheel drive is mounted on the wind wheel through the bearing; the coil spring is mounted in the spring seat fixedly connected with the worm wheel, and the inner end of the coil spring is connected to the blade shaft, the outer end Connected to the spring seat.

A stepper is fixedly mounted on the synchronous shaft.

The stepper comprises a stepping wheel mounted on the synchronizing shaft and a positioning ball matched with the stepping wheel. The stepping wheel has a recess for receiving the positioning ball, and the positioning ball is mounted on the outer casing of the synchronizer by a spring.

A hydraulic damper is also mounted on the blade shaft. One end of the hydraulic damper is connected to the arm fixed to the blade shaft, and the other end is connected to the casing of the wind wheel. After adopting the above technical solution, the present invention has the following advantages:

1. No additional energy and manpower control is required during operation, and the structure is simple and reliable;

2. Multiple blades are adjusted synchronously, and the consistency is good;

3. The setting of the worm gear makes the adjustment of the power output characteristic curve more convenient;

4. The stepper setting can eliminate the transient effects caused by turbulence.

5. The blade maintains a certain windward angle through the flexible fastening force of the coil spring, which makes the flexible pitch conversion angle smoother and softer, and maintains the best power output. The fan is highly efficient. DRAWINGS

Figure 1 is a schematic structural view of an embodiment of the present invention;

Figure 2 is a schematic view showing the partial arrangement of the synchronizer portion;

Figure 3 is a graph showing the output power of the fan and the wind speed. detailed description

1 and 2 are cross-sectional views showing the structure of an embodiment of the present invention, and the hatching is omitted for clarity of presentation. The wind turbine flexible pitching mechanism according to the present invention comprises a wind wheel 2 mounted on the front end of the main shaft 1 of the wind power generator 2, and a blade 3 mounted on the wind wheel 2. The lower end of the paddle 3 has a cylindrical leaf shaft 4. A leaf shaft 4 fixedly coupled to the lower end of the blade 3 is inserted into the wind wheel 2 through a bearing. The leaf shaft 4 is provided with a coil spring 5, and the inner end of the coil spring 5 is fixedly coupled to the leaf shaft 4, and the outer end is mounted with a spring seat 9A of the coil spring 5. A worm wheel 9 is also mounted on the leaf shaft 4 through a bearing, and the worm 10 that is in transmission with the worm wheel 9 is mounted on the wind wheel 2 through a bearing, and the worm wheel 9 is fixedly connected to the spring seat 9A, so that the worm wheel 10 can be adjusted by the worm gear 10 The spring seat 9A rotates to adjust the pretensioning force of the coil spring 5. Of course, the blade 3 of the fan should be limited to rotate within a certain angle. In order to limit the rotation angle of the blade, a protruding positioning block may be mounted on the blade shaft 4, or a shaft hole of the blade shaft 4 may be mounted on the wind wheel 2. Set the limit card slot to rotate the leaf axis 4 The angle is limited to a certain range, and the specific implementation means can be various. This is a well-known technology in the art, and will not be described in detail again.

A hydraulic damper 19 is also connected to the blade shaft 4 via a crank arm, and the structure of the hydraulic damper 19 is the same as that of the vehicle damper. One end is connected to the arm and the other end is connected to the casing of the rotor 2. This slows the rotation speed of the leaf shaft 4, avoids rapid back and forth vibration, and prolongs the service life, especially to avoid resonance.

A synchronizer 51 is fixedly mounted at a central portion of the rotor 2, the synchronizer 51 comprising a housing and a synchronizing shaft 6 mounted in the housing via a bearing, the synchronizing shaft 6 coincides with the axis of the main shaft 1, and the synchronizing shaft 6 is provided with a synchronizing umbrella The gear 7, the end of the leaf shaft 4 passes through the outer casing of the synchronizer 51 and is fixedly mounted with a blade bevel gear 8, which meshes with the blade bevel gear 8.

A stepper is fixedly mounted on the synchronizing shaft 6. The stepper comprises a stepping wheel 11 mounted on the synchronizing shaft 6 and a positioning ball 12 fitted on the stepping wheel 11. The stepping wheel 11 has a recess for receiving the positioning ball 12, and the recessed portion can be as shown in the figure. 2 is located at the edge of the stepping wheel 11, and may also be provided on the disk surface of the stepping wheel 11. The positioning ball 12 is mounted on the outer casing of the synchronizer 51 by a spring. The front end of the positioning ball 12 is inserted into the concave portion of the stepping wheel 11 by the pressure of the spring. When the stepping wheel 11 rotates, the positioning ball 12 must be overcome against the pressure of the spring. Only then can be rotated, so that it can play the role of positioning, so that the blade shaft 4 can reach a certain level difference before it can rotate, preventing the synchronous shaft 6 from rotating frequently.

Of course, the stepper can be in various forms, the role of which is to limit the rotation of the synchronizing shaft 6 to a number of gear positions. Avoid small wind speed changes causing frequent movements of the synchronizing shaft 6.

When in use, the pre-tensioning force of the coil spring 5 can be adjusted by the worm 10 according to the needs, that is, the initial wind speed of the pitching motion is adjusted. It is also possible to install a reduction motor mechanism on the worm 10 to realize automatic adjustment of working conditions. When the wind blows onto the blade 3, the side windward blade 3 divides the wind into two directions, one of which pushes the wind wheel 2 to rotate, and the other component force pushes the blade 3 around the blade. The axis of the shaft 4 rotates. When the wind force is less than the set value, the force component is insufficient to overcome the pretensioning of the coil spring 5, and the windward angle of the blade 3 is fixed. When the wind force is greater than the set value, the wind blown blade 3 deflects against the pretensioning force of the coil spring 5, and the larger the wind force, the larger the deflection angle, and the smaller the windward surface of the blade 3. It can play a good role in reducing wind pressure and controlling output power. Fig. 3 is a graph showing the output power of the fan and the wind speed. The vertical axis P of the graph represents the output power of the fan, and the horizontal axis S represents the wind speed. When the wind speed is S1, the fan starts to have output power. When the wind speed is S2, the output power of the fan reaches the rated power Pl. T1 represents the running power output curve of the fan without the pitch mechanism. When the wind speed exceeds the rated power output, When necessary, the output power of the fan continues to increase, exceeding the rated power. If it is not controlled, it will cause equipment damage and accidents. P2, P3, P4, and P5 respectively represent power values at the beginning of pitching in the case where the different pretension of the coil spring 5 is set in the embodiment of the present invention, and T2, Τ3, Τ4, and Τ5 respectively represent the corresponding cases. Output power curve. When the set pitch wind speed is reached, the windward angle of the blade 3 changes, the output power curve of the fan becomes gentle, and the output power of the fan is controlled near the rated power P1 within a large range of wind speed variation. Under different working conditions, the different maximum output power of the fan can be set by setting different pre-tensioning of the coil spring 5 to meet various requirements.

Claims

Claim

1. A flexible pitching mechanism for a wind power generator, comprising a wind wheel (2) mounted on the front end of the main shaft (1) and a blade (3) mounted on the wind wheel (2), characterized in that: the blade is fixedly connected ( 3) The lower end shaft (4) is inserted into the wind wheel (2) through the bearing, and the coil spring (5) is set on the leaf shaft (4); the synchronizer (51) is fixed in the center of the wind wheel (2) The synchronizer (51) comprises a housing and a synchronizing shaft (6) mounted in the housing via a bearing, the synchronizing shaft (6) coincides with the axis of the main shaft (1), and the synchronizing shaft (6) is provided with a synchronous bevel gear (7) ), the end of the leaf shaft (4) passes through the outer casing of the synchronizer (51) and is fixedly mounted with a leaf bevel gear (8), and the synchronous bevel gear (7) meshes with the leaf bevel gear (8).

2. A flexible pitching mechanism for a wind power generator according to claim 1, wherein: the yoke (9) is mounted on the yoke (4) via a bearing, and the worm (10) that is coupled to the worm gear (9) is passed The bearing is mounted on the rotor (2); the coil spring (5) is mounted in a spring seat (9A) fixedly connected to the worm gear (9), and the inner end of the coil spring (5) is connected to the leaf shaft (4). The end is attached to the spring seat (9A).

The flexible pitching mechanism of a wind power generator according to claim 1 or 2, characterized in that: the stepper is fixedly mounted on the synchronous shaft (6).

4. The wind turbine flexible pitching mechanism according to claim 3, wherein: said stepper comprises a stepping wheel (11) mounted on the synchronous shaft (6) and a step wheel (11) The mating positioning ball (12), the stepping wheel (11) has a recess for receiving the positioning ball (12), and the positioning ball (12) is mounted on the outer casing of the synchronizer (5) by a spring.

The flexible pitching mechanism of a wind power generator according to claim 1 or 2, characterized in that: a hydraulic damper (19) and one end of the hydraulic damper (19) are further mounted on the blade shaft (4) The connection is made to the arm fixed to the leaf shaft (4), and the other end is connected to the housing of the wind wheel (2).