A wind turbine pitch control device for use in wind turbine generators

Abstract

This invention discloses a wind turbine pitch control device for wind turbines, belonging to the field of wind power generation technology. To address the problems of complex structures, increased overall costs, and inability to simultaneously buffer and precisely adjust to the optimal wind angle, leading to reduced wind power generation efficiency, and the risk of single blade jamming causing overall turbine shutdown, drive overload, or even damage, the invention includes an impeller seat and a rotating sleeve fixed to the surface of the impeller seat. A wind turbine blade is rotatably mounted in the center of the rotating sleeve. An inner cavity is formed inside the impeller seat, and an adjustment mechanism is installed at the rear of the inner cavity. This invention avoids drive overload damage and overall structural fatigue failure caused by single blade jamming, ensuring safe wind turbine operation without immediate shutdown, maintaining partial blade pitch control power generation capacity, and significantly reducing downtime losses and maintenance costs in remote wind farms.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, specifically to a wind turbine pitch control device applied to a wind turbine generator. Background Technology

[0002] The wind turbine pitch control unit is a very important component of a wind turbine generator set. Its main function is to adjust the pitch angle of the wind turbine blades to control the mechanical energy absorbed by the wind turbine generator set, so as to reduce the impact of wind on the generator set while obtaining maximum energy.

[0003] Current wind turbine pitch control devices often employ independent electric or hydraulic pitch structures, or use complex structures for synchronous adjustment. These structures are relatively messy, have long transmission chains, and increase overall costs. Furthermore, existing pitch control devices use full-range elastic transmission to balance buffering. When adjusting the blade angle of attack, the deformation of the elastic components can cause a deviation between the actual adjustment angle of the blade and the preset angle of the controller. This makes it impossible to balance buffering and precise adjustment to the optimal wind angle, resulting in reduced wind power generation efficiency. In addition, when a single blade of the pitch control device gets stuck, it can easily lead to safety issues such as the entire machine shutting down, drive overload, or even damage.

[0004] To address the above issues, a wind turbine pitch control device for use on wind turbine generators is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a wind turbine pitch control device for use on wind turbine generators. By using this invention, the problems mentioned above are solved, such as the device having a complicated structure, increasing the overall cost, and failing to balance buffering and precise adjustment to the optimal wind angle, which leads to reduced wind power generation efficiency. In addition, when a single blade of the pitch control device gets stuck, it can easily cause the entire machine to shut down, drive overload, or even damage.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wind turbine pitch control device applied to a wind turbine generator, comprising an impeller seat and a rotating sleeve fixed on the surface of the impeller seat, wherein a wind turbine blade is rotatably mounted in the middle of the rotating sleeve, the impeller seat has an inner cavity, an adjustment mechanism is installed at the rear of the inner cavity, a fixed disk is provided at the output end of the adjustment mechanism, and multiple sets of pushing mechanisms are arranged in a ring inside the fixed disk, and a connecting mechanism is provided in the middle of the pushing mechanism;

[0007] One end of the connecting mechanism is fixed with a support block, and the bottom of the support block is fixed with a connecting seat. One end of the connecting seat is fixedly connected to the fan blade. The bottom of the pushing mechanism is slidably connected to the surface of the connecting seat. The support blocks are arranged in three groups around the connecting seat. Each group of support blocks has a connecting mechanism fixed on both sides. Each group of connecting mechanisms has a pushing mechanism on its outside.

[0008] Furthermore, the adjustment mechanism includes a servo motor fixed in the middle of the inner side of the impeller seat, and the output end of the servo motor is rotatably connected to a rotating shaft.

[0009] Furthermore, a connecting frame is fixed in the middle of the rotating shaft, and three sets of connecting frames are arranged in a ring around the rotating shaft, with a fixing block fixed at one end of the surface of each set of connecting frames.

[0010] Furthermore, a sliding rod passes through the middle of each set of fixed blocks, and the sliding rod is slidably connected to the fixed block. One end of each set of sliding rods is fixed with a swing arm, and one side of each set of swing arms is fixedly connected to one side of the corresponding fixed plate.

[0011] Furthermore, the pushing mechanism includes a pushing block disposed between the fixed plate and the connecting seat, and multiple sets of pushing blocks are arranged in a ring around the fixed plate. An electromagnetic seat is fixed to the inner center of each set of pushing blocks, and an installation cavity is opened in the lower part of the interior of each set of pushing blocks.

[0012] Furthermore, each of the mounting cavities is equipped with a spring, and a sliding block is fixed to the bottom of the spring. The sliding block is slidably connected to the pushing block, and a retaining plate is fixed to the bottom of the sliding block.

[0013] Furthermore, the connecting mechanism includes a fixed arc plate fixedly connected to the support block, the fixed arc plate being slidably connected to the pushing block, and an inner liner plate being installed on the upper part of the fixed arc plate. The upper surface of the inner liner plate is provided with a matching groove, and several sets of matching grooves are provided about the inner liner plate, and the position of the matching groove corresponds to the position of the first plate. Both sides of the support block are provided with a pushing mechanism and a connecting mechanism. A buffer spring is fixed on the outer side of the pushing block, and the pushing block is elastically connected to the support block through the buffer spring.

[0014] Furthermore, springs three are fixed on both sides of the inner lining plate, and the inner lining plate is elastically connected to the fixed arc plate through springs three. A pressure sensor is provided on one side of the middle of spring three, and the pressure sensor is fixed in two sets on both sides of the inner lining plate respectively.

[0015] Furthermore, a second mounting cavity is provided on the upper part of the inside of the push block, and a second spring is fixed inside the second mounting cavity.

[0016] Furthermore, a sliding block two is fixed to the top of the spring two, and a locking plate two is fixed to the top of the sliding block two. The sliding block two is engaged with the fixed plate through the locking plate two.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention adopts a pure mechanical transmission form that synchronously drives three sets of wind turbine blades with a single drive rotating shaft. It has the advantages of compact structure, short transmission chain, low cost and good synchronization. It is also easy to integrate fault isolation and redundant drive substructure, which is beneficial to improving the reliability and availability of wind turbines in harsh conditions such as at sea.

[0018] 2. When the wind turbine blades encounter strong winds or other large torques during operation, the present invention has the ability to buffer them, preventing the torque from being directly transmitted to core transmission components such as the adjustment mechanism and the drive mechanism, reducing the wear and tear and failure probability of mechanical parts, and improving the overall durability of the device. At the same time, it can also buffer the wind turbine blades in strong winds while allowing them to adjust their pitch in time to reduce the windward side of the wind turbine blades and improve the protection effect on the wind turbine blades.

[0019] 3. This invention can avoid the problems of drive overload damage and fatigue damage of the whole machine structure caused by single wind turbine blade jamming, and can ensure the safety of wind turbine operation. It does not require immediate shutdown and can maintain the pitch power generation capacity of some wind turbine blades, which can significantly reduce downtime losses and operation and maintenance costs in remote wind farms. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the impeller seat of the present invention; Figure 2 This is a schematic diagram of the internal three-dimensional structure of the impeller seat of the present invention; Figure 3 This is a three-dimensional structural diagram of the adjustment mechanism of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the wind turbine blades and the fixed disk of the present invention. Figure 5 This is a schematic diagram of the internal three-dimensional structure of the fixed disk of the present invention; Figure 6 For the present invention Figure 5 A magnified schematic diagram of the three-dimensional structure. Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 For the present invention Figure 6 Enlarged structural diagram at point B.

[0021] In the diagram: 1. Impeller seat; 2. Rotating sleeve; 3. Fan blade; 4. Inner cavity; 5. Adjustment mechanism; 51. Servo motor; 52. Rotating shaft; 53. Connecting frame; 54. Fixed block; 55. Sliding rod; 56. Swing arm; 6. Fixed plate; 7. Connecting seat; 8. Pushing mechanism; 81. Pushing block; 82. Electromagnetic seat; 83. Mounting cavity one; 84. Spring one; 85. Sliding block one; 86. Clamping plate one; 87. Mounting cavity two; 88. Spring two; 89. Sliding block two; 810. Clamping plate two; 9. Connecting mechanism; 91. Fixed arc plate; 92. Inner liner plate; 93. Matching groove; 94. Spring three; 95. Pressure sensor; 10. Support block; 20. Buffer spring. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To address the technical challenges of using independent electric or hydraulic pitch control structures, or employing complex structures for synchronous adjustment, which result in cumbersome structures, long drive chains, and increased overall costs, such as... Figures 1-4 As shown, the following preferred technical solutions are provided: A wind turbine pitch control device for use in wind turbines includes an impeller seat 1 and a rotating sleeve 2 fixed to the surface of the impeller seat 1. A wind turbine blade 3 is rotatably mounted in the middle of the rotating sleeve 2. Three sets of rotating sleeve 2 and wind turbine blades 3 are arranged in a ring around the impeller seat 1. The impeller seat 1, rotating sleeve 2, and wind turbine blades 3 are existing wind turbine blade assemblies; their specific power generation principles and components are not detailed here. An inner cavity 4 is provided inside the impeller seat 1 for the distribution and installation of the internal structure and power conductors. An adjustment mechanism 5 is installed at the rear of the inner cavity 4. A fixed plate 6 is provided at the output end of the adjustment mechanism 5. Three sets of fixed plates 6 are arranged around the adjustment mechanism 5, each corresponding to a wind turbine blade 3. A servo-type power mechanism is provided inside the adjustment mechanism 5, capable of driving the three sets of fixed plates 3. The fixed disk 6 rotates synchronously in both directions. Multiple sets of pushing mechanisms 8 are arranged in a ring inside the fixed disk 6, and a connecting mechanism 9 is arranged in the middle of the pushing mechanism 8. A support block 10 is fixed to one end of the connecting mechanism 9, and a connecting seat 7 is fixed to the bottom of the support block 10. One end of the connecting seat 7 is fixedly connected to the fan blade 3. The bottom of the pushing mechanism 8 is slidably connected to the surface of the connecting seat 7. Multiple sets of pushing mechanisms 8 can rotate radially along the outer surface of the connecting seat 7. The connecting seat 7 is fixed to the root of the fan blade 3, and a connecting seat 7 is fixed to the root of each set of fan blades 3. Three sets of support blocks 10 are arranged in a ring around the connecting seat 7, and a connecting mechanism 9 is fixed to both sides of each set of support blocks 10. A pushing mechanism 8 is arranged on the outside of each set of connecting mechanisms 9. The pushing mechanism 8 is made of non-magnetic metal.

[0024] When the fixed disk 6 is driven to rotate by the adjusting mechanism 5, the pushing mechanism 8 inside the fixed disk 6 can rotate together with the fixed disk 6, so that the multiple sets of pushing mechanisms 8 will rotate radially around the connecting seat 7. At this time, the pushing mechanisms 8 rotating together will generate a thrust on the support block 10 to rotate radially around the connecting seat 7 through the connecting mechanism 9. Since the connecting seat 7 is fixed at the root of the wind turbine blade 3, and the wind turbine blade 3 can rotate radially within the rotating sleeve 2, when the three sets of fixed disks 6 are driven to rotate forward and backward synchronously by the adjusting mechanism 5, they can ultimately drive each set of wind turbine blades 3 to rotate synchronously forward and backward. Thus, when the existing wind turbine identifies the wind force and wind direction, the angle of attack of the wind turbine blade 3 can be adjusted by the forward and backward rotation of the wind turbine blade 3 to achieve pitch control. At the same time, the equipment and principles commonly used by existing wind turbines for identifying wind force and wind direction will not be described in detail in this case.

[0025] like Figure 3 As shown, the adjustment mechanism 5 includes a servo motor 51 fixed in the middle of the inner side of the impeller seat 1. The servo motor 51 is controlled by the controller of the wind turbine generator itself and can be used as the power source for pitch control of the wind turbine blades 3. The output end of the servo motor 51 is rotatably connected to a rotating shaft 52, and the servo motor 51 can drive the rotating shaft 52 to rotate in both directions.

[0026] A connecting frame 53 is fixed in the middle of the rotating shaft 52, and three sets of connecting frames 53 are arranged in a ring around the rotating shaft 52. A fixing block 54 is fixed at one end of the surface of each set of connecting frames 53. When the servo motor 51 drives the rotating shaft 52 to rotate in both directions, the connecting frame 53 and the fixing block 54 can rotate in both directions synchronously with the rotating shaft 52.

[0027] Each set of fixed blocks 54 has a sliding rod 55 passing through its middle, and the sliding rod 55 is slidably connected to the fixed block 54. When adjusting the pitch of the wind turbine blade 3, the forward and reverse rotation of the fixed block 54 allows the sliding rod 55 to slide back and forth within the fixed block 54. The sliding distance of the sliding rod 55 is within the rotation range of the wind turbine blade 3 pitch adjustment, so that the sliding rod 55 will not slip out of the fixed block 54. One end of each set of sliding rods 55 is fixed with a swing arm 56, and one side of each set of swing arms 56 is fixedly connected to one side of the corresponding fixed plate 6.

[0028] During pitch control, the servo motor 51 drives the rotating shaft 52 to rotate around the central axis. The rotating shaft 52, through the fixed block 54 connected to it, drives the sliding rod 55 to perform circular motion. At the same time, the sliding rod 55 adaptively slides axially within the fixed block 54. Simultaneously, the swing arm 56, connected to the fixed disk 6, ultimately converts the rotational motion of the rotating shaft 52 into the pitch-changing rotational motion of the wind turbine blades 3 around their own axis driven by the fixed disk 6, thus realizing the pitch change action. Compared with the traditional electric and hydraulic independent pitch control structure, this method adopts a pure mechanical transmission form in which a single drive rotating shaft 52 synchronously drives three sets of wind turbine blades 3. It has the advantages of compact structure, short transmission chain, low cost, and good synchronization. It is also easy to integrate fault isolation and redundant drive substructures, which is beneficial to improving the operational reliability and availability of wind turbines in harsh conditions such as at sea.

[0029] To address the technical problem of reduced wind power generation efficiency due to the inability to simultaneously achieve buffering and precise adjustment to the optimal wind angle, such as... Figures 1-7 As shown, the following preferred technical solutions are provided: like Figure 6 As shown, the pushing mechanism 8 includes a pushing block 81 disposed between the fixed disk 6 and the connecting seat 7, and multiple sets of pushing blocks 81 are arranged in a ring around the fixed disk 6. An electromagnetic seat 82 is fixed in the middle of the inner side of each set of pushing blocks 81. The electromagnetic seat 82 is an electromagnetic coil, and the electromagnetic seat 82 is also controlled by the controller of the wind turbine itself. It can generate a strong magnetic force by using external power. An installation cavity 83 is opened in the lower part of the interior of each set of pushing blocks 81.

[0030] Each mounting cavity 83 has a fixed spring 84 inside, and a sliding block 85 is fixed to the bottom of the spring 84. The sliding block 85 is slidably connected to the push block 81. A retaining plate 86 is fixed to the bottom of the sliding block 85. The sliding block 85 is a strong magnetic block, and the sliding block 85 and the electromagnetic base 82 after being energized have the same magnetism. When the electromagnetic base 82 is energized, under the mutual repulsion of the same magnetism, the sliding block 85 and the retaining plate 86 can slide down along the push block 81 and stretch the spring 84, so that the retaining plate 86 is pushed out of the push block 81. The maximum distance that the sliding block 85 is pushed will not leave the push block 81, so that the sliding block 85 continues to be retracted into the push block 81. This allows the sliding block 85 and the push block 81 to be subjected to force when the push block 81 drives the sliding block 85 to rotate and squeeze along the radial direction of the connecting seat 7.

[0031] like Figure 6 As shown, the connecting mechanism 9 includes a fixed arc plate 91 fixedly connected to the support block 10. The fixed arc plate 91 is slidably connected to the push block 81, and an inner liner plate 92 is installed on the upper part of the fixed arc plate 91. Both the inner liner plate 92 and the fixed arc plate 91 are arc-shaped, and the curvature is the same as the trajectory of the push block 81 rotating radially along the connecting seat 7. The upper surface of the inner liner plate 92 is provided with a mating groove 93. Several sets of mating grooves 93 are provided about the inner liner plate 92, and the position of the mating grooves 93 corresponds to the position of the locking plate 86. When the sliding block 85 and the locking plate 86 are electromagnetically... When the magnetic force of the seat 82 pushes downward, the locking plate 86 can eventually be locked into the mating slot 93. Thus, when the wind turbine blade 3 is adjusted by pitch control, the electromagnetic seat 82 is energized by the controller. Under the mutual repulsion of the same magnetic force, the electromagnetic seat 82 and the sliding block 85 can slide downward along the push block 81, stretching the spring 84. This causes the locking plate 86 to be pushed out into the mating slot 93. At this time, the push block 81 will be engaged with the inner lining plate 92 and the fixed arc plate 91 through the sliding block 85, the locking plate 86, and the inner lining plate 92.

[0032] Both sides of the support block 10 are provided with a pushing mechanism 8 and a connecting mechanism 9. A buffer spring 20 is fixed on the outer side of the pushing block 81, and the pushing block 81 is elastically connected to the support block 10 through the buffer spring 20. The buffer spring 20 is a spring with a certain elastic force. When the wind turbine blade 3 is not adjusted for pitch, the electromagnetic base 82 is not energized. At this time, the sliding block 85 and the clamping plate 86 will be retracted into the mounting cavity 83 under the pulling action of the spring 84. The clamping plate 86 does not engage with the mating slot 93. At this time, the fixed arc plate 91 and the pushing block 81 can slide relative to each other, so that the connecting base 7 and the support block 10 can have elastic buffering ability with the pushing block 81 and the fixed plate 6 by using the buffer spring 20. Thus, when the wind turbine blade 3 encounters strong winds and other large torques during operation, it can have buffering ability, avoiding the direct transmission of torque to the core transmission components such as the adjusting mechanism 5 and the pushing mechanism 8, reducing the wear and failure probability of mechanical parts, and improving the durability of the overall device.

[0033] When the fixed disk 6 is driven to rotate forward and backward by the adjusting mechanism 5, the forward and backward rotation of the fixed disk 6 can drive the pushing block 81 and the fixed arc plate 91 to rotate together. At this time, the rotational force of the fixed disk 6 is transmitted through the pushing block 81, the fixed arc plate 91 and the support block 10, and can eventually drive the connecting seat 7 to rotate forward and backward synchronously, thereby adjusting the pitch of the wind turbine blade 3. When the wind turbine blade 3 is working in a stable state, it can be directly rigidly connected to drive the pitch adjustment of the wind turbine blade 3, avoiding the possibility of deviation in the adjustment angle due to the elastic deformation of the buffer spring 20 during rotation adjustment. This helps to adjust the wind turbine blade 3 to the optimal wind angle and ensure the power generation efficiency of the wind turbine.

[0034] Meanwhile, when the wind turbine blade 3 is in a buffered state and changes pitch when encountering strong winds, the electromagnetic base 82 is energized, which pushes the sliding block 85 and the clamping plate 86 downwards. At the same time, the pushing block 81, the fixed arc plate 91, and the inner liner plate 92 can slide together in a buffered manner. At this time, the clamping plate 86 is pushed downwards and can randomly clamp into the inner liner plate 92 during sliding. This allows the pushing block 81 and the fixed arc plate 91 to cooperate in transmitting the rotation pitch-changing ability of the fixed disk 6. This allows the connecting base 7 and the wind turbine blade 3 to be smoothly driven to rotate and change pitch. This allows the wind turbine blade 3 to change pitch in time while being buffered by strong winds, thereby reducing the windward surface of the wind turbine blade 3 and improving the protection effect of the wind turbine blade 3.

[0035] To address the technical problem that single-blade jamming in pitch control propellers can easily lead to system shutdown, drive overload, or even damage, such as... Figures 5-8 As shown, the following preferred technical solutions are provided: Springs 94 are fixed on both sides of the inner liner plate 92, and the inner liner plate 92 is elastically connected to the fixed arc plate 91 through the springs 94. The springs 94 are high-strength metal springs with a certain elasticity, and the elasticity provided by the springs 94 is greater than that of the inner liner plate 92 and the fixed arc plate 91 pushing the support block 10 and the connecting seat 7, so that the wind turbine blade 3 is subjected to resistance when it rotates. When the wind turbine blade 3 rotates normally, the inner liner plate 92 is pushed by the sliding block 85 and the clamping plate 86, so that the springs 94 will not be deformed. A pressure sensor 95 is provided on one side of the middle of the springs 94, and the pressure sensors 95 are in two sets and fixed on both sides of the inner liner plate 92 respectively. The pressure sensors 95 of the existing principle are also controlled by the wind turbine's own controller. When the wind turbine blade 3 rotates normally, the pressure sensors 95 are not subjected to force and do not have a sensing value.

[0036] A mounting cavity 2 87 is provided on the upper part of the inside of the push block 81, and a spring 2 88 is fixed inside the mounting cavity 2 87.

[0037] A sliding block 89 is fixed to the top of spring 88. Sliding block 89 is also an electromagnetic coil. When energized, sliding block 89 will generate magnetism that attracts electromagnetic base 82. A locking plate 810 is fixed to the top of sliding block 89. Sliding block 89 is engaged with fixed disk 6 through locking plate 810. When electromagnetic base 82 is energized for pitch control, sliding block 89 of electromagnetic coil is not energized, so that electromagnetic base 82 and sliding block 89 do not attract each other. Thus, sliding block 89 and locking plate 810 are locked in fixed disk 6 under the support of spring 94, so that fixed disk 6 can use push block 81 to transmit the rotational force during pitch control.

[0038] When one or more sets of fan blades 3 and rotating sleeve 2 become stuck due to long-term wear or external environmental corrosion, and cannot rotate, the stuck set of fan blades 3 will not be pushed by the fixed plate 6. This increases the thrust of the push block 81 on the inner liner plate 92, which will eventually compress the spring 3 94 and make it move. Meanwhile, the push block 81 of the normally rotating set of fan blades 3 can transmit the rotational force through the inner liner plate 92 and the fixed arc plate 91 to push the support block 10, the connecting seat 7 and the fan blades 3 to rotate. At this time, the inner liner plate 92, which is pushed and compresses the spring 3 94 due to the jamming, will eventually drive the pressure sensor 95 to move and contact the fixed arc plate 91, so that the pressure sensor 95 can sense the pressure.

[0039] At this point, pressure sensor 95 transmits a signal to the controller, which then energizes the sliding block 89 of the electromagnetic coil. This causes the sliding block 89 to attract the electromagnetic base 82, and the magnetic attraction generated by the two energized electromagnetic coils is greater than the friction between the clamping plate 810 and the fixed plate 6 when the clamping plate 810 is pushed. The sliding block 89 and the clamping plate 810 are then attracted downwards by the strong magnetic force, causing the clamping plate 810 to detach from the fixed plate 6. At this point, the pushing block 81 loses its connection with the fixed plate 6, preventing it from transmitting the rotational force of the fixed plate 6. The fan then becomes stuck. The fixed disk 6 inside the blade 3 will rotate freely, so that when one or more sets of wind turbine blades 3 are jammed and damaged, the normal set of one or more sets of wind turbine blades 3 can continue to adjust the pitch. This avoids the problem of drive overload damage and fatigue damage to the whole machine structure caused by the jamming of a single wind turbine blade 3, which can ensure the safety of wind turbine operation. There is no need to stop the machine immediately. It can maintain the pitch power generation capacity of some wind turbine blades 3, which can significantly reduce the downtime losses and operation and maintenance costs of remote wind farms. At the same time, when the pressure sensor 95 senses the pressure, it can be used in conjunction with the existing principle controller to prompt the staff to facilitate the maintenance of the jammed wind turbine blades 3.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wind turbine pitch control device for use on a wind turbine generator, comprising an impeller seat (1) and a rotating sleeve (2) fixed to the surface of the impeller seat (1), wherein a wind turbine blade (3) is rotatably mounted in the middle of the rotating sleeve (2), characterized in that: The impeller seat (1) has an inner cavity (4) inside. An adjustment mechanism (5) is installed at the rear of the inner cavity (4). A fixed disk (6) is provided at the output end of the adjustment mechanism (5). Multiple sets of pushing mechanisms (8) are arranged in a ring inside the fixed disk (6), and a connecting mechanism (9) is provided in the middle of the pushing mechanism (8). One end of the connecting mechanism (9) is fixed with a support block (10), and the bottom of the support block (10) is fixed with a connecting seat (7). One end of the connecting seat (7) is fixedly connected to the fan blade (3). The bottom of the pushing mechanism (8) is slidably connected to the surface of the connecting seat (7). The support block (10) is arranged in three rings around the connecting seat (7). Each set of support blocks (10) is fixed with a connecting mechanism (9) on both sides. Each set of connecting mechanisms (9) is provided with a pushing mechanism (8) on the outside.

2. The wind turbine pitch control device applied to a wind turbine generator according to claim 1, characterized in that: The adjustment mechanism (5) includes a servo motor (51) fixed in the middle of the inner side of the impeller seat (1), and the output end of the servo motor (51) is rotatably connected to a rotating shaft (52).

3. A wind turbine pitch control device applied to a wind turbine generator according to claim 2, characterized in that: A connecting frame (53) is fixed in the middle of the rotating shaft (52), and the connecting frame (53) is arranged in three sets around the rotating shaft (52). A fixing block (54) is fixed at one end of the surface of each set of the connecting frame (53).

4. A wind turbine pitch control device applied to a wind turbine generator according to claim 3, characterized in that: Each set of fixed blocks (54) has a sliding rod (55) passing through its middle, and the sliding rod (55) is slidably connected to the fixed block (54). One end of each set of sliding rods (55) is fixed with a swing arm (56), and one side of each set of swing arms (56) is fixedly connected to one side of the corresponding fixed plate (6).

5. A wind turbine pitch control device applied to a wind turbine generator according to claim 1, characterized in that: The pushing mechanism (8) includes a pushing block (81) disposed between the fixed disk (6) and the connecting seat (7), and the pushing block (81) is arranged in a ring around the fixed disk (6) in multiple groups. Each group of the pushing block (81) has an electromagnetic seat (82) fixed in the middle of its inner side, and each group of the pushing block (81) has an installation cavity (83) opened in the lower part of its interior.

6. A wind turbine pitch control device applied to a wind turbine generator according to claim 5, characterized in that: Each of the mounting cavities (83) is fitted with a spring (84), and a sliding block (85) is fixed to the bottom of the spring (84). The sliding block (85) is slidably connected to the push block (81), and a retaining plate (86) is fixed to the bottom of the sliding block (85).

7. A wind turbine pitch control device applied to a wind turbine generator according to claim 6, characterized in that: The connecting mechanism (9) includes a fixed arc plate (91) fixedly connected to the support block (10). The fixed arc plate (91) is slidably connected to the push block (81). An inner liner plate (92) is installed on the upper part of the fixed arc plate (91). A matching groove (93) is provided on the upper surface of the inner liner plate (92). Several sets of matching grooves (93) are provided about the inner liner plate (92). The position of the matching groove (93) corresponds to the position of the first plate (86). Both sides of the support block (10) are provided with a pushing mechanism (8) and a connecting mechanism (9). A buffer spring (20) is fixed on the outer side of the pushing block (81), and the pushing block (81) is elastically connected to the support block (10) through the buffer spring (20).

8. A wind turbine pitch control device applied to a wind turbine generator according to claim 7, characterized in that: Springs 3 (94) are fixed on both sides of the inner lining plate (92), and the inner lining plate (92) is elastically connected to the fixed arc plate (91) through the springs 3 (94). A pressure sensor (95) is provided on one side of the middle part of the springs 3 (94), and the pressure sensors (95) are in two sets and fixed on both sides of the inner lining plate (92).

9. A wind turbine pitch control device applied to a wind turbine generator according to claim 5, characterized in that: The push block (81) has an upper mounting cavity (87) inside, and a spring (88) is fixed inside the mounting cavity (87).

10. A wind turbine pitch control device applied to a wind turbine generator according to claim 9, characterized in that: The top of the second spring (88) is fixed with a second sliding block (89), and the top of the second sliding block (89) is fixed with a second locking plate (810). The second sliding block (89) is engaged with the fixed plate (6) through the second locking plate (810).

Images