Wind power generation system utilizing compressed air to store energy

Abstract

The invention discloses a wind power generation system utilizing compressed air to store energy. The wind power generation system comprises a wind power generator, and an air storage module and an auxiliary cooling brake mechanism are arranged on the wind power generator; the auxiliary cooling brake mechanism comprises an air cooling disc arranged on the side face of the brake disc, the air cooling disc communicates with the air storage module through a pipeline, and an air guide opening is formed in the side, close to the brake disc, of the air cooling disc. The auxiliary cooling brake mechanism further comprises a guide connecting pipe and a lower connecting pipe which are fixedly installed on the installation cylinder, one end of the guide connecting pipe is connected with the air storage module through a switching assembly, and the other end of the guide connecting pipe is movably provided with a movable driving plate through a first connecting assembly. During braking, high-pressure air in the air storage module drives the first connecting assembly and the second connecting assembly respectively, so that the speed reduction brake plate abuts against the brake disc from the side face of the brake disc, and the speed reduction pressing block abuts against the brake disc from the brake disc in the radial direction. According to the invention, the braking is safer and more reliable.

Description

Technical Field

[0001] The invention relates to a wind power generator, and in particular to a wind power generation system utilizing compressed air to store energy. Background Art

[0002] A wind turbine is an electric device that converts wind energy into mechanical work, which drives the rotor to rotate and finally outputs alternating current. A wind turbine is generally composed of a wind wheel, a generator (including a device), a rectifier (tail), a tower, a speed limit safety mechanism, and an energy storage device.

[0003] Usually, in strong winds, wind turbines need to adjust the blades of the wind turbine according to various data such as wind direction and wind force, and use the yaw system to adjust the direction of the wind rotor so that it does not face the wind completely, in order to reduce the impact of the wind. At the same time, the brake device is used to brake the wind rotor to protect the wind turbine structure. The general brake device uses the cooperation of the brake disc and the brake pad to brake the wind rotor. When the wind rotor rotates at high speed, emergency braking will cause the brake disc and the brake pad to produce very large friction. The large friction will cause the surface heat of the brake disc to be too high, which may affect the braking performance of the brake disc or cause it to deform after long-term use. In a strong wind environment, if the wind force continues to increase, the wind force on the wind rotor will gradually increase. At this time, the external force on the brake disc and the brake pad will become larger and larger. Once the brake disc fails or the brake disc wears and the braking force is insufficient, the wind rotor will continue to rotate at an overspeed in a strong wind environment, and will break and fly off, which is dangerous. Summary of the invention

[0004] The technical problem to be solved by the present invention is that, in view of the fact that the braking performance of existing wind turbines is prone to failure or insufficient braking force, the present invention provides a wind power generation system using compressed air energy storage that can assist the wind turbine braking device in reliable braking.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A wind power generation system utilizing compressed air energy storage comprises a wind turbine, wherein the wind turbine is provided with an air storage module, an air compressor, a turbine, and a second generator, wherein the air outlet of the air compressor is connected to the air inlet of the air storage module, the air outlet of the air storage module is connected to the turbine, the turbine is connected to the rotor of the second generator, a brake disc is installed on the hub rotating shaft of the wind turbine, a brake caliper is provided on the brake disc, two brake pads are movably installed on the brake caliper, and the structural feature thereof is that an auxiliary cooling brake mechanism is also provided on the brake disc;

[0007] The auxiliary cooling brake mechanism includes an air-cooled disk arranged on the side of the brake disc, the air-cooled disk is connected with the air storage module through a pipeline, and an air guide port is opened on the side of the air-cooled disk close to the brake disc; the auxiliary cooling brake mechanism also includes a guide pipe and a lower pipe fixedly installed on the mounting cylinder, one end of the guide pipe is connected to the air storage module via a switching component, and the other end is movably installed with a movable drive plate via a connecting component one, and a deceleration brake plate is installed on the movable drive plate, one end of the lower pipe is connected to the air storage module via a switching component, and the other end is movably installed with a deceleration pressure block via a connecting component two. When braking, the high-pressure air in the air storage module drives the connecting component one and the connecting component two respectively, so that the deceleration brake plate presses against the brake disc from the side of the brake disc, and the deceleration pressure block presses against the brake disc radially from the brake disc.

[0008] When the wind turbine is braking, the present invention utilizes the high-pressure air in the air storage module to respectively drive the connecting component one and the connecting component two, so that the deceleration brake plate presses against the brake disc from the side of the brake disc, and the deceleration pressure block presses against the brake disc radially from the brake disc, thereby keeping the state of the brake disc stable during braking, thereby improving the braking reliability and reducing the wear of the brake disc.

[0009] Furthermore, heat dissipation holes are radially arranged on the brake disc, and an auxiliary deceleration mechanism is arranged inside the heat dissipation holes, and the auxiliary deceleration mechanism comprises a movable gear ring, a movable gear, a movable abutment plate, a linkage plate, a spring, a movable block and a paddle plate. The movable gear ring is installed in the middle of the brake disc, the movable gear is installed in the movable gear ring, and the movable gear is meshed with the movable gear ring, and the paddle plate is fixedly installed on the outer periphery of the movable gear ring, one end of the movable abutment plate is hinged to the brake disc, and the other end is hinged to the movable block via the linkage plate, one end of the spring is connected to the brake disc, and the other end is connected to the movable block, and the movable gear drives the movable gear ring, and when the paddle plate rotates with the movable gear ring, the paddle plate presses the movable block, and the movable block presses the brake disc, and the movable abutment plate is installed under the deceleration pressure block, and the deceleration pressure block presses or separates from the brake disc via the movable abutment plate. In this way, the present invention can press the movable abutment plate through the deceleration pressure block, so that the movable abutment plate presses the brake disc to further prevent the brake disc from rotating, and when braking is successful, the deceleration pressure block can be reset, the movable abutment plate can be pushed outward, and the linkage plate cooperates with the movable abutment plate to form an L-shaped limit stop frame, and the deceleration pressure block is positioned between two adjacent L-shaped limit stop frames, further preventing the brake disc from rotating, that is, locking the brake disc for the second time, thereby improving braking safety and reliability.

[0010] Furthermore, the connecting assembly 1 includes a piston plate 1 and an extension plate slidably mounted in the guide tube, the piston plate 1 is mounted facing the gas direction of the guide tube, and the extension plate is connected to the piston plate 1. When high-pressure gas is introduced into the guide tube, the high-pressure gas acts on the piston plate 1, the piston plate 1 and the extension plate move together, and drive the connected movable drive plate to move toward the side of the brake disc.

[0011] Furthermore, a spring 1 is installed between the extension plate and the bottom plate of the guide tube to facilitate the resetting of the extension plate and the piston plate 1 so that the movable drive plate is separated from the brake disc.

[0012] Furthermore, the connection assembly 1 also includes a shrink pipe 1 installed in the guide pipe, and the shrink pipe 1 is installed on the air-facing surface of the piston plate 1. When the high-pressure air passes through the shrink pipe 1, the flow rate can be further increased, thereby increasing the impact force on the piston plate 1.

[0013] Furthermore, a leakage pipe is installed on the guide pipe, and the leakage pipe is connected to the air inlet of the air cooling plate through a pipeline. In this way, the high-pressure gas in the secondary gas storage tank can be introduced into the air cooling plate through the guide pipe and the leakage pipe.

[0014] Furthermore, the second connecting assembly includes a second piston plate and a second spring which are slidably mounted inside the lower connecting pipe. The second piston plate is fixedly connected to the deceleration pressure block. One end of the second spring is connected to the second piston plate and the other end is connected to the bottom of the lower connecting pipe. When high-pressure gas is introduced into the lower connecting pipe, the high-pressure gas impacts the second piston plate, and the second piston plate compresses the second spring and moves with the deceleration pressure block until it presses against the brake disc.

[0015] Furthermore, the second connection assembly also includes a second shrink pipe installed in the lower connecting pipe, and the second shrink pipe is installed on the air-facing surface of the piston plate 2. When the high-pressure air passes through the second shrink pipe, the flow rate can be further increased, thereby increasing the impact force on the piston plate 2.

[0016] Furthermore, a leakage pipe is installed on the lower connecting pipe, and the leakage pipe is connected to the air inlet of the air cooling disk through a connecting pipe. In this way, the high-pressure gas in the gas storage module can be introduced into the air cooling disk through the guiding pipe and the leakage pipe.

[0017] Furthermore, the auxiliary cooling brake mechanism also includes a closed box, which is fixedly mounted on the lower connecting pipe, and a positioning block is telescopically mounted inside the closed box. When the positioning block is extended, the positioning block interferes with the deceleration pressure block and limits the deceleration pressure block, thereby ensuring that the brake disc is locked for the second time by the deceleration pressure block.

[0018] Further, the switching assembly includes a guide port arranged on the mounting cylinder, an inner guide cylinder installed in the mounting cylinder, a rotating cylinder installed in the inner guide cylinder, an extension tube arranged on the rotating cylinder, a transition port arranged on the inner guide cylinder, and a guide pipe arranged on the rotating cylinder, the guide pipe is connected to the air outlet of the air storage module, the extension tube is connected to the transition port, the rotating cylinder and the inner guide cylinder are coaxially installed, and a driving gear 1 is installed on the rotating shafts of the rotating cylinder and the inner guide cylinder, the driving gear 1 is meshed with the driving gear 2, and when the driving gear 2 drives the driving gear 1, the driving gear 1 is intermittently connected with the guide port with the transition port.

[0019] Furthermore, a secondary air tank is also provided on the wind turbine, and the air outlet of the air storage module is simultaneously connected to the air inlet of the secondary air tank, and the air outlet of the secondary air tank is connected to the air inlet of the switching component.

[0020] Furthermore, a speed measuring plate is installed on the blade hub rotating shaft to monitor the rotation speed of the hub.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The gas storage module of the present invention can be used to store high-pressure gas to be used in conjunction with an air compressor, a turbine and a generator to generate electricity when the wind force is insufficient or the electricity demand is at a peak. At the same time, an auxiliary cooling brake mechanism is provided. When the wind force increases and is about to exceed the safety range, the auxiliary cooling brake mechanism cooperates with the brake disc to perform a point braking operation on the high-speed rotating wheel hub to slow down the rotation speed of the wheel hub. At the same time, during the point braking process, the high-pressure gas inside the secondary gas storage tank and the auxiliary cooling brake mechanism are used to accelerate the air flow on the surface of the brake disc to accelerate the dissipation of heat during the braking process. When the wind force continues to increase and exceeds the safety range, the auxiliary cooling brake mechanism is used to cooperate with the brake disc to perform a point braking and deceleration operation on the wheel hub, while the brake caliper is controlled to cooperate with the brake pad and the brake disc to brake the wheel hub. After the wheel hub is successfully braked, the auxiliary cooling brake mechanism is controlled to cooperate with the brake disc to perform a secondary locking operation on the wheel hub to ensure the braking effect of the wheel hub in a strong wind environment and improve the stability and safety after braking.

[0023] 2) In the present invention, when the wind is sufficient, the blades rotate and the mechanical energy is converted into electrical energy through the generator 1. A part of the generated electrical energy is used to meet the electricity demand, and the excess electrical energy drives the air compressor to compress the outside air and store it in the air storage module. When the compressed air inside the air storage module is full, the excess compressed air enters the secondary air storage tank for storage for subsequent auxiliary cooling brake mechanism and auxiliary deceleration mechanism to cooperate with the auxiliary brake locking and brake disc cooling operation. When the wind is insufficient or the electricity demand is at a peak, the high-pressure air in the air storage module is released and drives the turbine to rotate. When the turbine rotates, it drives the generator 2 to operate to convert mechanical energy into electrical energy to meet the electricity demand.

[0024] 3) The present invention can use the auxiliary cooling brake mechanism to drive the deceleration brake plate and the deceleration pressure block when the wind force increases and is about to exceed the safety range by using the high-pressure gas stored in the secondary gas storage tank to enter the guide pipe and the lower pipe to drive the deceleration brake plate and the deceleration pressure block, and cooperate with the switching component, the brake disc and the auxiliary deceleration mechanism to perform a point braking operation on the wheel hub. The point braking can ensure the deceleration and braking effect of the wheel hub while reducing the heat generated during braking: during the point braking process, the high-pressure gas drives the deceleration brake plate and the deceleration pressure block to move to brake the wheel hub again and again, and the high-pressure gas entering the guide pipe and the lower pipe is discharged through the discharge pipe and enters the air-cooled disc and then blows to the surface of the brake disc to accelerate the heat dissipation of the brake disc surface; when the wind force continues to increase and exceeds the safety range, the deceleration brake plate and the deceleration pressure block cooperate with the brake disc to perform a point braking operation on the wheel hub to slow down its rotation speed, and at the same time, the brake caliper and the brake pad cooperate with the brake disc to stop the wheel hub. After the wheel hub stops, the positioning block cooperates with the deceleration pressure block and the auxiliary deceleration mechanism to perform a secondary locking operation on the wheel hub to ensure the stability and safety of the wheel hub after the hub stops.

[0025] 4) When the wind force increases and is about to exceed the safety range, the auxiliary deceleration mechanism of the present invention can drive the deceleration brake plate and the brake disc to intermittently contact to achieve the braking operation of the wheel hub by high-pressure gas entering the guide pipe and the lower pipe. While braking, the deceleration pressure block is intermittently in contact with the movable abutment plate, and the movable abutment plate is abutted against the brake disc under the action of the arc spring to increase the friction of the contact surface and improve the braking and deceleration effect of the wheel hub. When the wind force continues to increase and exceeds the safety range, the deceleration brake plate and the deceleration pressure block cooperate to perform deceleration of the wheel hub, and the brake caliper and the brake pad cooperate with the brake disc to stop the wheel hub. After the wheel hub stops, the linkage plate and the movable abutment plate are lifted and stretched open by the movable abutment plate in cooperation with the movable gear and the shift plate, and the deceleration pressure block limited by the positioning block abuts against the movable abutment plate or is stuck between the L-shaped limit stop frame formed by two adjacent movable abutment plates and the linkage plate, thereby achieving a secondary locking operation of the wheel hub after the stop, thereby ensuring the stability and safety of the wheel hub after the stop. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention 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 described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic structural diagram of a wind power generation system utilizing compressed air energy storage according to the present invention;

[0028] Figure 2 This is a schematic diagram of the installation of the gas storage module of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the gas storage module of the present invention;

[0030] Figure 4 It is a schematic diagram of the installation of the brake caliper of the present invention;

[0031] Figure 5 This is a schematic diagram of the installation of the brake disc of the present invention;

[0032] Figure 6 It is a structural schematic diagram of the auxiliary cooling brake mechanism of the present invention;

[0033] Figure 7 This is a schematic diagram of the installation of the air cooling plate of the present invention;

[0034] Figure 8 This is a schematic diagram of the installation of the deceleration brake plate of the present invention;

[0035] Fig. 9 It is a structural schematic diagram of the connection component 1 and the connection component 2 of the present invention;

[0036] Fig.10 It is a schematic diagram of the driving structure of the switching component of the present invention;

[0037] Fig.11 It is a schematic diagram of the principle structure of the switching component of the present invention;

[0038] Fig.12 It is a structural schematic diagram of the auxiliary speed reduction mechanism of the present invention.

[0039] In the figure: 1. Nacelle; 11. Hub; 12. Blade; 13. Generator 1; 2. Tower; 21. Air compressor; 22. Turbine; 23. Generator 2; 24. Secondary air tank; 3. Air storage module; 31. Pipe pile; 32. Pile top flange; 33. Reinforcement ring 1; 34. Reinforcement ring 2; 35. Head; 36. Maintenance ladder; 37. Manhole; 38. Reinforcement ring 3; 4. Connecting shaft; 41. Speed ​​measuring plate; 5. Brake disc; 51. Brake caliper; 52. Brake pad; 53. Heat dissipation hole; 6. Auxiliary cooling brake mechanism; 61. Air cooling disc; 62. Connecting pipe; 622. Connecting pipe; 63. Fixing frame; 631. Mounting tube; 632. Guide pipe; 633. Inner Guide cylinder; 634, rotating cylinder; 635, extension tube; 636, driving gear one; 637, driving gear two; 638, guide port; 64, guide tube; 641, movable drive plate; 642, deceleration brake plate; 643, shrinking tube one; 644, piston plate one; 645, extension plate; 646, spring one; 65, lower tube; 651, piston plate two; 652, spring two; 653, deceleration pressure block; 654, shrinking tube two; 655, closing box; 656, positioning block; 66, discharge tube; 7, auxiliary deceleration mechanism; 71, movable ring gear; 72, movable gear; 73, movable back plate; 74, linkage plate; 75, arc spring; 76, movable block; 77, dial plate. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Reference Figure 1The embodiment of the wind power generation system utilizing compressed air energy storage of the present invention comprises a nacelle 1, a hub 11 is movably mounted on one side of the nacelle 1, and three blades 12 are rotatably mounted on the hub 11. A generator 13 is arranged inside the nacelle 1, and the wind acts on the blades 12 and drives them to rotate. After the blades 12 rotate, the speed is increased through the gearbox, and the rotor in the generator 13 is driven to rotate, converting mechanical energy into electrical energy output. A tower 2 is fixedly mounted at the bottom of the nacelle 1, and an air storage module 3 is arranged at the bottom of the tower 2, and the air storage module 3 is used to store compressed air.

[0044] Reference Figure 2 The tower 2 is fixedly installed with an air compressor 21, a turbine 22, a second generator 23, and a secondary air storage tank 24. The air inlet of the air compressor 21 is connected to the outside air, the air outlet of the air compressor 21 is connected to the air inlet of the air storage module 3, the air outlet of the air storage module 3 is connected to the air inlet of the turbine 22 and the secondary air storage tank 24, and the output shaft of the turbine 22 is connected to the rotor of the second generator 23. When the wind is sufficient, the blades 12 rotate and the mechanical energy is converted into electrical energy through the generator 1 13. A part of the generated electrical energy is output to meet the electricity demand, and a part of the electrical energy is used to drive the air compressor 21 to compress the outside air and store it in the air storage module 3. When the wind is insufficient or the electricity demand is at a peak, the electricity produced by the generator 1 13 is insufficient to meet the power supply demand, the high-pressure air in the air storage module 3 is released and drives the turbine 22 to rotate. When the turbine 22 rotates, it drives the generator 2 23 to operate to convert the mechanical potential energy of the high-pressure air into electrical energy to meet the electricity demand.

[0045] like Figure 3 As shown, the gas storage module 3 includes a pipe pile 31 arranged under the tower 2. The pipe pile 31 is a hollow structure for storing high-pressure gas. A pile top flange 32 is fixedly installed on the top of the pipe pile 31, and the pile top flange 32 is fixedly connected to the tower 2 by fasteners. End caps 35 are provided at both ends of the inner cavity of the pipe pile 31, so that a closed cavity for storing high-pressure gas is formed in the pipe pile 31. In order to ensure the sealing of the connection between the end cap 35 and the pipe pile 31, the connection position of the end cap 35 and the pipe pile 31 is butt welded, and the weld is a full penetration weld or a fillet weld. Air holes are opened on both sides of the pipe pile 31, and a reinforcement ring 1 33 is fixedly installed at the air hole on one side, and a reinforcement ring 2 34 is fixedly installed at the air hole on the other side. The reinforcement ring 1 33 and the reinforcement ring 2 34 are both welded at the air hole, and the end cap 35 is connected to the two air holes through a pipeline. A manhole 37 is provided in the middle of the pipe pile 31, and a maintenance ladder 36 is fixedly installed on the pipe pile 31. The maintenance ladder 36 and the manhole 37 cooperate to facilitate maintenance personnel to perform maintenance. A row hole is provided at the bottom of the pipe pile 31, and a reinforcement ring 38 is fixedly installed at the row hole. The row hole can be used for exhaust and sludge discharge.

[0046] Reference Figure 4 - Figure 6 The hub 11 is fixedly mounted on one end of the connecting shaft 4, and a speed measuring plate 41 is fixedly mounted on the other end of the connecting shaft 4. The speed measuring plate 41 can be used to monitor the speed of the running state of the fan hub 11.

[0047] A brake disc 5 is fixedly mounted on the connecting shaft 4, a brake caliper 51 is arranged on the brake disc 5, and two brake pads 52 are movably mounted on the brake caliper 51. The brake pads 52 can clamp the brake disc 5 by driving the hydraulic system to achieve braking of the brake disc 5, the connecting shaft 4 and the wheel hub 11. A temperature sensor is fixedly mounted on the brake disc 5, and the temperature sensor is electrically connected to the external controller to monitor the temperature of the brake disc 5. Heat dissipation holes 53 are evenly opened on the brake disc 5, and the heat dissipation holes 53 can increase the surface area of ​​the brake disc 5 in contact with the air and thus improve the heat dissipation efficiency of the brake disc 5. An auxiliary cooling brake mechanism 6 is also arranged on the brake disc 5, and the auxiliary cooling brake mechanism 6 can assist the brake disc 5 in performing a braking operation on the connecting shaft 4, and perform an auxiliary locking operation on the connecting shaft 4 when the wind force is too strong, and perform an auxiliary cooling operation on the brake disc 5 when braking. An auxiliary deceleration mechanism 7 is arranged in the heat dissipation hole 53 of the brake disc 5, and the auxiliary deceleration mechanism 7 can cooperate with the auxiliary cooling brake mechanism 6 to perform auxiliary braking and locking operations on the brake disc 5.

[0048] When the wind is sufficient, the gas storage module 3 cooperates with the air compressor 21 to convert the excess electrical energy into high-pressure gas and store it. When the wind is insufficient or the electricity demand is at a peak, the gas storage module 3 cooperates with the turbine 22 and the generator 23 to convert the potential energy of the stored high-pressure gas into electrical energy to meet the electricity demand. When the wind force increases and is about to exceed the safety range, the auxiliary cooling brake mechanism 6 is used to cooperate with the brake disc 5 to perform a braking operation on the high-speed rotating wheel hub 11 to slow down the rotation speed of the wheel hub 11. In addition, during the braking process, the high-pressure gas inside the secondary air tank 24 and the auxiliary cooling brake mechanism 6 are used to accelerate the air flow on the surface of the brake disc 5 to speed up the dissipation of heat during the braking process. At the same time, when the wind force continues to increase and exceeds the safety range, the auxiliary cooling brake mechanism 6 is used to cooperate with the brake disc 5 to perform a braking and deceleration operation on the wheel hub 11, while the brake caliper 51 is controlled to cooperate with the brake pad 52 and the brake disc 5 to brake the wheel hub 11. After the wheel hub 11 is successfully braked, the auxiliary cooling brake mechanism 6 is controlled to cooperate with the brake disc 5 to perform a secondary locking operation on the wheel hub 11 to ensure the braking effect of the wheel hub 11 in a strong wind environment and improve the stability and safety after braking.

[0049] Reference Figure 7 - Fig.11The auxiliary cooling brake mechanism 6 includes two air-cooling discs 61 respectively arranged on both sides of the brake disc 5. The air-cooling disc 61 is a hollow structure. The side of the air-cooling disc 61 close to the brake disc 5 is evenly provided with air guide ports, which can guide the air to the surface of the brake disc 5 to accelerate the heat dissipation of the surface of the brake disc 5 during the braking process. The air inlet of the air-cooling disc 61 is connected to the secondary air storage tank 24 through a connecting pipe 62, and a one-way valve is provided on the pipeline for connecting the connecting pipe 62 and the secondary air storage tank 24. For the convenience of connection, connecting pipes 622 are fixedly installed at both ends of the connecting pipe 62. A fixing frame 63 is fixedly installed inside the cabin 1 by fasteners, and a mounting cylinder 631 is fixedly installed on the fixing frame 63. Mounting cylinders 631 are respectively provided on both sides of the air-cooling disc 61. Two guide pipes 64 and one lower pipe 65 are fixedly mounted on the mounting tube 631 through three guide ports 638, wherein the two guide pipes 64 are symmetrically arranged on the mounting tube 631, and the angle between the two guide pipes 64 is preferably set to 120°. To facilitate the braking operation, the three guide ports 638 are evenly arranged along the circumference of the mounting tube on the mounting tube 631. Preferably, the angle between every two adjacent guide ports 638 is 120°, and the two guide pipes 64 and the lower pipe 65 are respectively fixedly connected to a guide port 638. A movable driving plate 641 is movably mounted on the outer side of the guide tube 64, and a deceleration brake plate 642 is fixedly mounted on the movable driving plate 641. The guide tube 64 is a hollow structure, and a connecting component 1 is arranged inside it. The movable driving plate 641 is movably mounted on the guide tube 64 through the connecting component 1. When the connecting component 1 is subjected to the high-pressure gas pressure entering the guide tube 64, the connecting component 1 moves, and brings the movable driving plate 641 and the deceleration brake plate 642 to press against the brake disc 5 from the side of the brake disc. The lower tube 65 is also a hollow structure, and a deceleration pressure block 653 is movably mounted inside it, and a connecting component 2 is arranged inside the lower tube 65. The deceleration pressure block 653 is movably mounted on the lower tube 65 through the connecting component 2. When the connecting component 2 is subjected to the high-pressure gas pressure entering the lower tube 65, the connecting component 2 moves, and brings the deceleration pressure block 653 to press against the brake disc 5 along the radial direction of the brake disc 5. A switching component is disposed inside the mounting tube 631 , and the switching component can realize the intermittent supply of compressed air to realize the braking and brake locking operations on the brake disc 5 .

[0050] The connecting assembly 1 includes a constricted tube 1 643, a piston plate 1 644, and an extension plate 645 which are slidably installed in the guide tube 64. The piston plate 1 644 is installed facing the incoming gas direction of the guide tube, the constricted tube 1 643 is installed on the gas-facing surface of the piston plate 1 644, and the extension plate 645 is connected to the gas-repelling surface of the piston plate 1 644. When high-pressure air is input into the guide tube 64, the high-pressure air then flows through the constricted tube 1 643, so that the gas pressure is further increased. The pressurized gas acts on the piston plate 1 644 to move the piston plate 1 644 and the extension plate 645, and at the same time, the movable driving plate 641 moves toward the brake disc 5, so that the deceleration brake plate 642 presses against the brake disc 5 from the side of the brake disc. A spring 1 646 is installed between the extension plate 645 and the bottom plate of the guide tube 64 to facilitate the reset of the piston plate 1 644 and the extension plate 645.

[0051] The second connecting component includes a second shrinking tube 654, a second piston plate 651, and a second spring 652 which are slidably installed inside the lower connecting tube 65. The second piston plate 651 is installed facing the incoming air direction of the lower connecting tube 65. The second shrinking tube 654 is installed on the air-facing surface of the second piston plate 651. The back-to-air surface of the second piston plate 651 is fixedly connected to the deceleration pressure block 653. One end of the second spring 652 is connected to the back-to-air surface of the second piston plate 651, and the other end is connected to the bottom of the lower connecting tube 65. High-pressure air is input into the lower connecting pipe 65, and then flows through the second contraction pipe 654, so that the gas pressure is further increased. The pressurized gas acts on the second piston plate 651 to move the second piston plate 651 and the deceleration pressure block 653, and finally presses against the brake disc 5 along the radial direction of the brake disc 5. After the high-pressure air in the lower connecting pipe 65 flows out through the discharge pipe 66, the second piston plate 651 returns to its original position under the action of the second spring 652, and the deceleration pressure block 653 is separated from the brake disc 5.

[0052] The guide pipe 64 and the lower guide pipe 65 are both provided with a discharge pipe 66, which is connected to the air inlet of the air cooling plate 61 through the connecting pipe 622 and the connecting pipe 62, so that the high-pressure gas in the secondary air storage tank 24 after being transmitted and worked through the guide pipe 64 or the lower guide pipe 65 is sent to the air cooling plate 61 through the discharge pipe 66, and then blown to the brake disc 5 through the air guide port of the air cooling plate 61 for cooling the brake disc 5. In order to prevent gas backflow, a one-way valve is provided on the pipe connecting the air cooling plate 61 and the discharge pipe 66.

[0053] A closed box 655 is fixedly installed on the lower connecting pipe 65, and a positioning block 656 is movably installed inside the closed box 655. The positioning block 656 is driven by a hydraulic telescopic rod, and the hydraulic telescopic rod is electrically connected to the external controller. Under the action of the hydraulic telescopic rod, the positioning block 656 can extend to the interior of the lower connecting pipe 65 and interfere with the deceleration pressure block 653 to realize the brake locking operation.

[0054] When the wind force increases and is about to exceed the safety range, the high-pressure gas stored in the secondary gas tank 24 is used to enter the guide pipe 64 and the lower pipe 65 to drive the deceleration brake plate 642 and the deceleration pressure block 653, and cooperate with the switching component, the brake disc 5 and the auxiliary deceleration mechanism 7 to perform a braking operation on the wheel hub 11. The braking operation can ensure the deceleration and braking effect of the wheel hub 11 while reducing the heat generated during braking. At the same time, during the braking operation, the high-pressure gas repeatedly drives the deceleration brake plate 642 and the deceleration pressure block 653 to move and brake the wheel hub 11. The high-pressure gas entering the guide pipe 64 and the lower pipe 65 is discharged through the discharge pipe 66 and enters the air cooling plate 61, and then blows to the surface of the brake disc 5 through the air guide port to accelerate the heat dissipation of the surface of the brake disc 5. When the wind force continues to increase and exceeds the safety range, the deceleration brake plate 642 and the deceleration pressure block 653 cooperate with the brake disc 5 to brake the wheel hub 11 and slow down its rotation speed, while controlling the brake caliper 51 and the brake pad 52 to cooperate with the brake disc 5 to brake the wheel hub 11. When the wheel hub 11 stops, the positioning block 656 cooperates with the deceleration pressing block 653 and the auxiliary deceleration mechanism 7 to perform a secondary locking operation on the wheel hub 11 to ensure the stability and safety of the wheel hub 11 after the wheel hub 11 stops.

[0055] The switching assembly includes a mounting cylinder 631, an inner guide cylinder 633, and a rotating cylinder 634. The mounting cylinder 631 is fixedly mounted on the fixing frame 63. The inner guide cylinder 633 and the rotating cylinder 634 are sequentially rotated and mounted in the mounting cylinder 631, and the inner guide cylinder 633 and the rotating cylinder 634 are coaxially mounted. Three extension tubes 635 are evenly fixedly mounted on the rotating cylinder 634 along the circumferential direction, and the angle between each two adjacent extension tubes 635 is 120°. A transition port (not shown) is provided on the inner guide cylinder 633 at a position corresponding to the extension tube 635, and the extension tube 635 is fixedly connected to the transition port on the inner guide cylinder 633. A flow guide pipe 632 for connecting to the secondary gas storage tank 24 is also fixedly mounted on the rotating cylinder 634. A driving gear 2 637 is rotatably installed in the mounting cylinder 631, and the driving gear 2 637 is driven by a servo motor; a driving gear 1 636 is rotatably installed on the common rotating shaft of the inner guide cylinder 633 and the rotating cylinder 634, and the driving gear 1 636 and the driving gear 2 637 are meshed with each other. When the servo motor driving gear 2 637 rotates one circle, the driving gear 1 636 rotates one-third of a circle, that is, the driving gear 1 636 drives the inner guide cylinder 633 and the rotating cylinder 634 to rotate one-third of a circle, so that the transition port on the inner guide cylinder 633 is intermittently connected with the guide port 638 on the mounting cylinder 631, and the high-pressure gas in the secondary gas storage tank 24 intermittently enters the guide pipe 64 and the lower pipe 65. When the wind force increases and is about to exceed the safety range, the high-pressure gas in the secondary gas storage tank 24 intermittently enters the interior of the guide tube 64 and the lower tube 65 through the switching assembly, and the deceleration brake plate 642 and the deceleration pressure block 653 move toward the brake disc 5 under the action of the high-pressure gas to perform a braking deceleration operation. In this process, the inner guide cylinder 633 is driven to rotate regularly through the mutual engagement of the driving gear 2 637 and the driving gear 1 636, so that the transition port on the inner guide cylinder 633 is intermittently connected with the guide port 638 on the mounting cylinder 631, and the high-pressure gas can only intermittently enter the guide tube 64 and the lower tube 65. Therefore, the high-pressure gas can only intermittently drive the deceleration brake plate 642 and the deceleration pressure block 653, and on this basis cooperate with the brake disc 5 and the auxiliary deceleration mechanism 7 to perform a braking operation on the wheel hub 11; when the guide port 638 on the mounting cylinder 631, that is, the entrance of the guide pipe 64 and the lower pipe 65 is closed, the deceleration brake plate 642 and the deceleration pressure block 653 move and reset, and at the same time, the gas inside the guide pipe 64 and the lower pipe 65 enters the air-cooled disk 61 through the discharge pipe 66 and is blown to the surface of the brake disc 5 through the air guide port on the air-cooled disk 61 for cooling, so as to realize the cooling operation of the brake disc 5.

[0056] like Fig.12As shown, the auxiliary deceleration mechanism 7 includes a movable ring gear 71, a movable gear 72, a movable abutment plate 73, a linkage plate 74, an arc spring 75, a movable block 76, and a paddle plate 77. The movable ring gear 71 and the movable gear 72 are rotatably mounted inside the brake disc 5. The movable gear 72 is driven by a servo motor, which is electrically connected to an external controller. The movable ring gear 71 is meshed with the movable gear 72, and a paddle plate 77 is evenly fixedly mounted on the outer periphery of the movable ring gear 71. The movable abutment plate 73, the linkage plate 74, the arc spring 75, the movable block 76, and the paddle plate 77 are mounted in groups in the heat dissipation holes 53 of the brake disc 5. A plurality of movable abutment plates 73 are evenly arranged on the outer periphery of the brake disc 5, and the deceleration pressing block 653 is mounted relative to the movable abutment plate 73. The deceleration pressing block 653 presses against or separates from the brake disc 5 via the movable abutment plate 73. One end of the movable abutment plate 73 is hinged to the heat dissipation hole 53, and the other end is hinged to the linkage plate 74 and the movable block 76 in sequence. At the same time, the movable plate 76 is connected to the heat dissipation hole 53 via the arc spring 75. The angle between each two adjacent movable abutment plates 73 is 30°. When the movable block 76 is pressed and slides, the movable abutment plate 73 is pushed outward by the linkage plate 74, and the linkage plate 74 cooperates with the movable abutment plate 73 to form an L-shaped limit stop frame. When the wind force increases and is about to exceed the safety range, the high-pressure gas enters the guide tube 64 and the lower tube 65 to drive the deceleration brake plate 642 to intermittently contact the brake disc 5 to achieve the point braking operation of the wheel hub 11. At the same time, the deceleration pressure block 653 is intermittently in contact with the movable abutment plate 73. When the deceleration pressure block 653 is in contact with the movable abutment plate 73, the movable abutment plate 73 abuts against the outer periphery of the brake disc 5, increasing the friction force of the contact surface of the brake disc 5, thereby improving the point braking deceleration effect of the wheel hub 11. When the wind force continues to increase and exceeds the safety range, the deceleration brake plate 642 and the deceleration pressure block 653 cooperate to perform point braking and deceleration on the wheel hub 11. After deceleration, the brake caliper 51 and the brake pad 52 cooperate with the brake disc 5 to stop the wheel hub 11. After the wheel hub 11 stops, the movable gear 72 is driven, and the movable ring gear 71 rotates accordingly. The paddle plate 77 outside the movable ring gear 71 rotates to push the movable block 76, and the movable block 76 lifts and stretches the movable support plate 73 through the linkage plate 74. The deceleration pressure block 653 limited by the positioning block 656 is against the movable support plate 73 or is stuck between the two adjacent movable support plates 73 and the L-shaped limit stop frame formed by the linkage plate 74, thereby realizing the secondary locking operation of the wheel hub 11 after the brake is stopped, thereby ensuring the stability and safety of the wheel hub 11 after the brake is stopped.

[0057] When the present invention is used, when the wind is sufficient, the blades 12 rotate and convert mechanical energy into electrical energy through the generator 1 13. Part of the generated electrical energy is used to meet the electricity demand, and part of the electrical energy drives the air compressor 21 to compress the outside air and store it in the air storage module 3; when the compressed air in the air storage module 3 is fully stored, the excess compressed air enters the secondary air storage tank 24 for storage; when the wind is insufficient or the electricity demand is at a peak, the high-pressure air in the air storage module 3 is released to drive the turbine 22 to rotate, and when the turbine 22 rotates, it drives the generator 2 23 to operate and convert mechanical energy into electrical energy to meet the electricity demand;

[0058] When the external wind force sensor (speed measuring plate 41) detects that the wind force is increasing and is about to exceed the safety range, the pitch angle of the blade 12 is adjusted through the slurry collection system of the wind turbine, and the compressed gas inside the secondary air storage tank 24 is simultaneously allowed to enter the guide port 638 of the mounting tube 631 through the pipeline and the switching assembly. The high-pressure gas entering the guide port 638 then enters the inside of the guide pipe 64 and the lower pipe 65. The high-pressure gas entering the guide pipe 64 and the lower pipe 65 drives the deceleration brake plate 642 and the deceleration pressure block 653 on the movable drive plate 641 to contact the brake disc 5, thereby slowing down the rotation speed of the brake disc 5 through friction to achieve a braking effect. At the same time, the deceleration pressure block 653 intermittently contacts the movable abutment plate 73 of the auxiliary deceleration mechanism 7. The movable abutment plate 73 abuts against the brake disc 5 under the elastic force of the arc spring 75 to increase the friction force and thus improve the deceleration effect on the brake disc 5.

[0059] When the high-pressure gas drives the deceleration brake plate 642 and the deceleration pressure block 653 to move toward the brake disc 5, the servo motor is controlled to drive the driving gear 2 637 to rotate. When the driving gear 2 637 rotates, it drives the driving gear 1 636 meshing therewith to rotate. During the rotation of the driving gear 1 636, the inner guide cylinder 633 is driven to rotate regularly and synchronously. When the inner guide cylinder 633 rotates, the extension tube 635 is intermittently connected or staggered with the guide port 638. When the extension tube 635 is staggered with the guide port 638, the gas inlet of the guide tube 64 and the lower tube 65 is closed, and the one-way valve on the discharge tube 66 is opened synchronously to fill the gas in the guide tube 64 and the lower tube 65. The high-pressure gas is discharged through the discharge pipe 66 and blown to the surface of the brake disc 5 to accelerate the air flow on the surface of the brake disc 5 to speed up the dissipation of the heat generated by the brake friction; at the same time, the deceleration brake plate 642 and the deceleration pressure block 653 move and reset under the elastic force of the spring 1 646 and the spring 2 652, and separate from the brake disc 5 and the movable abutment plate 73, and release the speed limit of the brake disc 5. With the rotation of the inner guide tube 633, the high-pressure gas repeatedly enters the guide tube 64 and the lower tube 65, and drives the deceleration brake plate 642 and the deceleration pressure block 653 to repeatedly abut or separate from the brake disc, so that the blade 12 can be braked when the wind force is strong;

[0060] When the external wind force sensor (speed measuring board 41) detects that the wind force continues to increase and exceeds the safety range, the wind turbine yaw system controls the blades 12 to rotate to a position parallel to the wind direction, and controls the retracting system to adjust the pitch angle of the blades 12. Synchronously, the hydraulic system is controlled to drive the brake pads 52 on the brake caliper 51 to move to both sides of the surface of the brake disc 5 and to fit tightly against the brake disc 5 so as to brake the brake disc 5 by friction. At the same time, the high-pressure gas is controlled to enter the guide pipe 64 and the lower pipe 65 to drive the deceleration brake plate 642 and the deceleration pressure block 653 to cooperate with each other to perform a point braking and deceleration operation on the brake disc 5.

[0061] When the wheel hub 11 brakes successfully and stops rotating, the high-pressure gas pipeline is closed, and the high-pressure gas in the guide pipe 64 and the lower pipe 65 is discharged through the discharge pipe 66, and the deceleration brake plate 642 and the deceleration pressure block 653 move to reset. At the same time, the hydraulic telescopic rod is controlled to drive the positioning block 656 to move inside the lower pipe 65, so that the positioning block 656 interferes with the deceleration pressure block 653 and prevents the deceleration pressure block 653 from moving, that is, the deceleration pressure block 653 is limited. On this basis, the servo motor can be controlled to drive the movable gear 72 to rotate, and the movable gear ring 71 can be driven to rotate by engaging with the movable gear ring 71. When the movable gear ring 71 rotates, the shift plate 77 is driven to move and squeeze the movable block 76 to slide. When the movable block 76 slides, it cooperates with the linkage plate 74 to push and hold the movable abutment plate 73 outward. The linkage plate 74 cooperates with the movable abutment plate 73 to form an L-shaped limit stop frame. The limited deceleration pressure block 653 is positioned between two adjacent L-shaped limit stops. In this way, when the brake caliper 51 and the brake pad 52 cooperate with the brake disc 5 to brake the wheel hub 11, the deceleration pressure block 653 cooperates with the movable abutment plate 73 and the linkage plate 74 to lock the wheel hub 11 for the second time, thereby ensuring stability and safety after braking.

[0062] During the braking process, if the temperature sensor detects that the surface temperature of the brake disc 5 is too high, the one-way valve on the pipe connecting the air-cooled disc 61 and the secondary air tank 24 is opened while braking, and high-pressure gas flows through the pipe to the air-cooled disc 61 and sprays onto the surface of the brake disc 5 to speed up the dissipation of heat from the surface of the brake disc 5 and ensure the normal use of the brake disc 5 in the future.

[0063] The above is only a specific implementation scheme of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art can make many possible changes and modifications to the technical scheme of the present invention by using the technical content disclosed above without departing from the scope of the technical scheme of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical scheme of the present invention should fall within the protection scope of the technical scheme of the present invention.

Claims

1. A wind power generation system utilizing compressed air energy storage, comprising a wind turbine, wherein the wind turbine is provided with an air storage module (3), an air compressor (21), a turbine (22), and a second generator (23), wherein an air outlet of the air compressor is connected to an air inlet of the air storage module, an air outlet of the air storage module is connected to the turbine, the turbine is connected to a rotor of the second generator, a brake disc (5) is installed on a rotating shaft of a blade hub of the wind turbine, a brake caliper (51) is provided on the brake disc (5), a brake pad (52) is movably installed on the brake caliper (51), and the characteristic is that: The brake disc (5) is also provided with an auxiliary cooling brake mechanism (6); The auxiliary cooling brake mechanism (6) comprises an air cooling plate (61) arranged on the side of the brake disc (5), the air cooling plate (61) is connected to the air storage module (3), and an air guide port is opened on the side of the air cooling plate (61) close to the brake disc (5); the auxiliary cooling brake mechanism (6) also comprises a guide pipe (64) and a lower guide pipe (65) fixedly mounted on the mounting tube (631), one end of the guide pipe (64) is connected to the air storage module (3) via a switching component, and the other end is connected to the air storage module (3) via a connecting rod. A movable drive plate (641) is movably mounted on the connecting component one, a deceleration brake plate (642) is mounted on the movable drive plate (641), one end of the lower connecting pipe (65) is connected to the air storage module (3) via a switching component, and a deceleration pressure block (653) is movably mounted on the other end via a connecting component two. When braking, the high-pressure air in the air storage module (3) drives the connecting component one and the connecting component two respectively, so that the deceleration brake plate presses against the brake disc from the side of the brake disc, and the deceleration pressure block presses against the brake disc radially from the brake disc.

2. The wind power generation system utilizing compressed air energy storage according to claim 1, characterized in that: The brake disc (5) is provided with heat dissipation holes in the radial direction, and an auxiliary deceleration mechanism (7) is provided inside the heat dissipation holes. The auxiliary deceleration mechanism (7) comprises a movable gear ring (71), a movable gear (72), a movable abutment plate (73), a linkage plate (74), a spring (75), a movable block (76) and a shift plate (77). The movable gear ring is installed in the middle of the brake disc, the movable gear is installed in the movable gear ring, and the movable gear is meshed with the movable gear ring, and the shift plate (77) is fixedly installed on the outer periphery of the movable gear ring. The movable plate (73) is installed below the deceleration pressure block (653), and the deceleration pressure block (653) is pressed against or separated from the brake disc via the movable plate.

3. The wind power generation system utilizing compressed air energy storage according to claim 1, characterized in that: The connecting assembly 1 comprises a piston plate 1 (644) and an extension plate (645) which are slidably installed in the guide tube (64); the piston plate 1 (644) is installed facing the gas direction of the guide tube; and the extension plate (645) is connected to the piston plate 1 (644).

4. The wind power generation system utilizing compressed air energy storage according to claim 3 is characterized in that: A spring (646) is installed between the extension plate and the bottom plate of the guide tube.

5. The wind power generation system utilizing compressed air energy storage according to claim 3 is characterized in that: The connecting assembly 1 also includes a shrinking tube 1 (643) installed in the guide tube (64), and the shrinking tube 1 (643) is installed on the gas-facing surface of the piston plate 1 (644).

6. The wind power generation system utilizing compressed air energy storage according to claim 5, characterized in that: A leakage pipe (66) is installed on the guide pipe (64), and the leakage pipe (66) is connected to the air inlet of the air cooling plate (61) through a pipeline.

7. The wind power generation system utilizing compressed air energy storage according to claim 1, characterized in that: The second connecting component comprises a second piston plate (651) and a second spring (652) slidably mounted inside the lower connecting pipe (65); the second piston plate is fixedly connected to the deceleration pressure block; one end of the second spring is connected to the second piston plate, and the other end is connected to the bottom of the lower connecting pipe.

8. The wind power generation system utilizing compressed air energy storage according to claim 7, characterized in that: The second connecting assembly also includes a second shrink pipe (654) installed in the lower connecting pipe (65), and the second shrink pipe (654) is installed on the gas-facing surface of the second piston plate (651).

9. The wind power generation system utilizing compressed air energy storage according to claim 8, characterized in that: A drain pipe (66) is installed on the lower connecting pipe (65), and the drain pipe (66) is connected to the air inlet of the air cooling plate (61) through a connecting pipe (62).

10. The wind power generation system utilizing compressed air energy storage according to claim 1, characterized in that: The auxiliary cooling brake mechanism (6) also includes a closed box (655), which is fixedly mounted on the lower pipe (65), and a positioning block (656) is telescopically mounted inside the closed box (655). When the positioning block is extended, the positioning block interferes with the deceleration pressure block and limits the deceleration pressure block.

11. The wind power generation system utilizing compressed air energy storage according to claim 1, characterized in that: The switching assembly includes a guide port (638) arranged on the mounting cylinder, an inner guide cylinder (633) installed in the mounting cylinder, a rotating cylinder (634) installed in the inner guide cylinder, an extension tube (635) arranged on the rotating cylinder, a transition port arranged on the inner guide cylinder, and a guide tube (632) arranged on the rotating cylinder, wherein the guide tube is connected to the air storage module (3), the extension tube is connected to the transition port, the rotating cylinder and the inner guide cylinder are coaxially mounted, and a driving gear 1 (636) is installed on the rotating shafts of the rotating cylinder and the inner guide cylinder, the driving gear 1 is meshed with a driving gear 2 (637), and when the driving gear 2 drives the driving gear 1, the driving gear 1 is intermittently connected with the guide port with the transition port.

12. The wind power generation system using compressed air energy storage according to any one of claims 1 to 11, characterized in that: The wind turbine is also provided with a secondary gas storage tank (24), the gas outlet of the gas storage module is simultaneously connected to the gas inlet of the secondary gas storage tank, and the gas outlet of the secondary gas storage tank is connected to the gas inlet of the switching component.

13. The wind power generation system using compressed air energy storage according to any one of claims 1 to 11, characterized in that: A speed measuring plate is installed on the blade hub rotating shaft.

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