Area-variable wind driven generator blade

Abstract

The utility model discloses an area variable type wind driven generator blade which is composed of an arm part, an outer frame and two blade wing assemblies symmetrically arranged in the outer frame, blade cloth in the blade wing assemblies serves as a main part of the blade, the wind receiving area of the blade cloth can be adjusted, and specifically, a rotary drum is driven to rotate through a driving device. When the blade cloth is retracted to the minimum area, the windward area of the blade cloth is also the minimum, so that the overall stress of the blade is also the minimum in strong wind weather, and the angle of the blade or the windward angle of a wind wheel (the blade and a hub are integrated) does not need to be considered any more.

Description

Technical Field

[0001] The utility model belongs to the field of wind turbine components, and particularly relates to a variable-area wind turbine blade. Background Art

[0002] The blades of general wind turbines have a fixed area. Currently, the blades of large wind turbines can only adjust the angle, and the angle adjustment is achieved through a pitch control system. This system can automatically adjust the angle of the blades according to the change of wind speed to optimize the power generation efficiency and stability. However, since the area of the blades themselves does not change, when dealing with strong wind weather, it is necessary to adjust the angle of the blades themselves and also consider adjusting the windward angle of the wind wheel. If the wind direction changes quickly, it is very difficult to adjust immediately. Therefore, if the blade area can be adjusted, the above situation can be dealt with by only changing the wind-receiving area of the blades. Currently, the methods for adjusting the blade area are as follows: 1. Publication No. CN118728633A, 2. Publication No.: US10337494B2, 3. CN108252854A, 4. CN108150345A. The above four methods all have the most basic blade structure, and the area is increased on the basis of the basic blade structure (by folding, sliding, etc.). Content of the Utility Model

[0003] (1) Technical problems to be solved: Provide a variable-area wind turbine blade.

[0004] (2) The technical solution adopted by the utility model is as follows: A variable-area wind turbine blade, the blade includes an arm part, an outer frame, and two blade wing assemblies symmetrically arranged in the outer frame. One end of the arm part is fixedly connected to the outer frame. The blade wing assembly includes a rotating cylinder, a blade cloth, and a strengthening grid. The rotating cylinder is connected to the middle position inside the outer frame through a fixed shaft. The blade cloth is wound around the rotating cylinder. Side pressing pieces are fixed on both side edges of the blade cloth, and end pressing plates are fixed at the ends of the blade cloth. Flow guiding grooves are arranged on both inner sides of the inner cloth connection of the outer frame. The side pressing pieces are located in the flow guiding grooves at corresponding positions and are slidably connected thereto. The strengthening grid is fixedly connected to the outer frame. The end pressing plate is connected with a pull rope, the pull rope is wound around a winding wheel, a wheel shaft is coaxially and fixedly arranged in the middle of the winding wheel, and both ends of the wheel shaft are connected to the outer frame through bearing seats. Both the wheel shaft and the rotating cylinder are connected to a driving device.

[0005] Further technical solution: The driving device includes a motor, a main gear, a transition gear, a cylinder gear and two chain drive assemblies. A machine base is provided on the outer frame. The outer shell of the motor is fixed to the machine base. A main gear is coaxially and fixedly provided on the output shaft of the motor. There are two cylinder gears, and the two cylinder gears are respectively installed on the rotating cylinders corresponding to the two blade wing assemblies. The main gear is meshed and drivingly connected with one of the cylinder gears. A transition gear is arranged between the main gear and the other cylinder gear and is drivingly connected. A bearing seat is provided on the machine base. The transition gear is rotatably connected to the bearing seat through a rotating shaft. The output shaft of the motor is connected to the wheel shaft corresponding to one of the blade wing assemblies through one of the chain drive assemblies. The rotating shaft is connected to the wheel shaft corresponding to the other blade wing assembly through the other chain drive assembly.

[0006] Further technical solution: The diversion groove is of a "T"-shaped groove structure, and the part of the side pressing piece located inside the diversion groove matches its structure.

[0007] Further technical solution: The strengthening grid is on the leeward side of the blade cloth, or there are two strengthening grids, and the two strengthening grids are respectively on the upper and lower sides of the blade cloth.

[0008] (3) Due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows: By redesigning the blade shape, specifically dividing the blade into an arm part, an outer frame and two blade wing assemblies symmetrically arranged inside the outer frame. The blade cloth in the blade wing assembly is the main part of the blade, and the area receiving wind can be adjusted. Specifically, by driving the rotating cylinder to rotate through the driving device, the blade cloth is released, and at the same time, the wheel shaft is driven to rotate by the driving device, so that the pulling rope is wound on the winding wheel. During the process, the pulling rope can drag the blade cloth to spread it, realizing the adjustment of the blade area. It is also possible to drive the rotating cylinder to rotate through the driving device to wind up the blade cloth, and at the same time, drive the wheel shaft to rotate by the driving device to make the winding wheel release the pulling rope. During the process, the rotating cylinder can wind up the blade cloth, and the pulling rope is in a released state and rotates with the blade cloth, realizing the adjustment of the blade area. When the blade cloth is retracted to the minimum area, the area receiving wind is also the smallest. Therefore, in case of strong wind weather, the overall force on the blade is also the smallest, and there is no need to consider the angle of the blade itself or the windward angle of the wind wheel (the blade and the hub as a whole).

[0009] Diversion grooves are arranged on both inner sides of the connection inside the outer frame. The side pressing piece is located in the corresponding diversion groove and is slidably connected thereto. The strengthening grid is fixedly connected to the outer frame. The side pressing piece is slidably connected in the diversion groove, and the setting of the strengthening grid is to ensure the connection strength of the blade cloth and provide a support point for the blade cloth. Description of the Drawings

[0010] Figure 1 is the overall structural schematic diagram of the blade of the present utility model;

[0011] Figure 2It is a schematic structural diagram of the outer frame and the blade wing assembly described in the present utility model;

[0012] Figure 3 It is a schematic structural diagram of the outer frame and the blade wing assembly from another perspective described in the present utility model;

[0013] Figure 4 It is Figure 3 a schematic structural diagram of the position A in

[0014] Figure 5 It is Figure 3 a schematic structural diagram of the position B in

[0015] Figure 6 It is Figure 3 a schematic structural diagram of the position C in

[0016] Figure 7 It is a schematic structural diagram of the outer frame and the blade wing assembly from another perspective described in the present utility model;

[0017] Figure 8 It is Figure 7 a schematic structural diagram of the position A in

[0018] Figure 9 It is Figure 7 a schematic structural diagram of the position B in

[0019] Figure 10 It is Figure 7 a schematic structural diagram of the position C in

[0020] Figure 11 It is a schematic diagram of the direction principle when the driving device drives the rotation of the rotating cylinder and the wheel shaft;

[0021] Figure 12 It is a schematic diagram of the connection between the side pressing piece and the side of the blade cloth described in the present utility model;

[0022] Figure 13 It is a schematic structural diagram of the wire mesh described in the present utility model;

[0023] Figure 14 It is a schematic structural diagram of the end pressing plate described in the present utility model;

[0024] Figure 15 It is a schematic structural diagram of the blade and the hub forming the wind turbine rotor of the wind power generator described in the present utility model. Specific embodiments

[0025] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] As Figures 1 - 15As shown in the figure. A variable-area wind turbine blade, the blade 1 includes an arm 2, an outer frame 3, and two blade wing assemblies 4 symmetrically arranged within the outer frame 3. One end of the arm 2 is fixedly connected to the outer frame 3. The blade wing assembly 4 includes a rotating cylinder 5, a blade cloth 6, and a strengthening wire frame 7. The rotating cylinder 5 is connected to the middle position within the outer frame 3 through a fixed shaft 8. The blade cloth 6 is wound around the rotating cylinder 5. Side pressing pieces 9 are fixed to both side edges of the blade cloth 6, and an end pressing plate 10 is fixed at the end of the blade cloth 6. Flow guiding grooves 11 are provided on both inner sides of the inner cloth connection within the outer frame 3. The side pressing pieces 9 are located within the flow guiding grooves 11 at corresponding positions and are slidably connected thereto. The strengthening wire frame 7 is fixedly connected to the outer frame 3. The end pressing plate 10 is connected to a pull rope 12. The pull rope 12 is wound around a reel 13. A wheel shaft 14 is coaxially and fixedly arranged in the middle of the reel 13. Both ends of the wheel shaft 14 are connected to the outer frame 3 through bearing seats. Both the wheel shaft 14 and the rotating cylinder 5 are connected to a driving device.

[0027] Working principle: Process of the blade cloth 6 spreading out: The driving device simultaneously drives the rotating cylinder 5 and the wheel shaft 14 in the two blade wing assemblies 4. When the rotating cylinder 5 rotates (the rotating cylinder 5 is rotationally connected to the fixed shaft 8 through a bearing, the inner ring of the bearing is connected to the fixed shaft 8 (by welding), the outer ring of the bearing is fixedly connected to the rotating cylinder 5 (by welding), and the fixed shaft 8 is fixed to the outer frame 3), it releases the blade cloth 6. At the same time, the wheel shaft 14 rotates, causing the pull rope 12 to be wound on the reel 13. During this process, the pull rope 12 can drag the blade cloth 6 to make it spread out. To complete this process, it is necessary to satisfy that the rotating cylinder 5 and the reel 13 in the blade wing assembly 4 rotate in the same direction, and the rotating cylinder 5 releases the blade cloth 6 while the reel 13 winds up the pull rope 12. Process of the blade cloth 6 being wound up: Drive the rotating cylinder 5 to rotate (in the opposite direction to the spreading process), causing it to wind up the blade cloth 6. At the same time, the wheel shaft 14 rotates, causing the reel 13 to release the pull rope 12. During this process, the rotating cylinder 5 can wind up the blade cloth 6, and the pull rope 12 is in a released state and follows the blade cloth 6. In the present utility model, since the two blade wing assemblies 4 are symmetric with each other (mirror arrangement), the rotation directions of the two rotating cylinders 5 are opposite.

[0028] The drive device includes a motor 15, a main gear 16, an intermediate gear 17, a barrel gear 18, and two chain drive assemblies 19 (which can also be synchronous belt drive assemblies, each including a toothed pulley and a toothed belt). A machine base 20 is provided on the outer frame 3. The housing of the motor 15 is fixed to the machine base 20. The main gear 16 is coaxially and fixedly provided on the output shaft of the motor 15. There are two barrel gears 18, and the two barrel gears 18 are respectively mounted on the corresponding rotating drums 5 of the two vane assemblies 4. The main gear 16 is in meshing transmission connection with one of the barrel gears 18. An intermediate gear 17 is provided and in transmission connection between the main gear 16 and the other barrel gear 18. A bearing seat is provided on the machine base 20, and the intermediate gear 17 is rotatably connected to the bearing seat through a rotating shaft 21. The output shaft of the motor 15 is connected to the wheel shaft 14 corresponding to one of the vane assemblies 4 through one of the chain drive assemblies 19, and the rotating shaft 21 is connected to the wheel shaft 14 corresponding to the other vane assembly 4 through the other chain drive assembly 19. The motor 15 is a brake motor 15 with a braking function. When the motor 15 is not running, it is in a braking state to prevent the rotating drum 5 from rotating by itself.

[0029] Working principle of the drive device: The motor 15 drives the main gear 16 to rotate. The main gear 16 directly drives one of the barrel gears 18 to rotate. At the same time, the main gear 16 drives the other barrel gear 18 to rotate through the transmission of the intermediate gear 17. When the main gear 16 rotates clockwise, the directly driven barrel gear 18 rotates counterclockwise, and the corresponding rotating drum 5 also rotates counterclockwise, in the process of winding the vane cloth 6. The intermediate gear 17 rotates counterclockwise, and the barrel gear 18 driven by the intermediate gear 17 rotates clockwise, and the corresponding rotating drum 5 also rotates clockwise, in the process of winding the vane cloth 6. The output shaft of the motor 15 drives a wheel shaft 14 to rotate through the first chain drive assembly 19 (this wheel shaft 14 corresponds to the rotating drum 5 directly driven by the main gear 16). This wheel shaft 14 rotates clockwise, and the reel 13 is in a state of releasing the pull rope 12. The rotating shaft 21 is coaxially and fixedly connected (by key or pin connection) to the intermediate gear 17. The rotating shaft 21 is rotatably connected to the bearing seat. The rotating shaft 21 is connected to another wheel shaft 14 through the other chain drive assembly 19. This wheel shaft 14 rotates counterclockwise, and the corresponding reel 13 is in a state of paying out the rope. Each chain drive assembly 19 includes two sprockets and a chain.

[0030] The guide groove 11 is a "T"-shaped groove structure, and the part of the side pressure piece 9 located inside the guide groove 11 matches its structure. The guide groove 11 is a "T"-shaped groove, and the side pressure piece 9 is a matching "T"-shaped head. On the basis of ensuring sliding, the side pressure piece 9 can be restricted in the guide groove 11 to prevent the side pressure piece 9 from leaving the "T"-shaped groove. The side pressure piece 9 is a kind of edge sealing structure, which is formed by forming a folded edge on the side edge of the leaf cloth 6 and wrapping a metal mesh (wire mesh 22) and sewing and fixing it with sutures. In this way, the overall thickness of the edge sealing structure is greater than the thickness of the leaf cloth 6 itself. The part with the metal mesh in the edge sealing structure is located in the deeper part of the cavity in the "T"-shaped groove, so that the part with the metal mesh in the edge sealing structure can be restricted in the guide groove 11, and it does not affect the movement of the side pressure piece 9 along the guide groove 11. Because the leaf cloth 6 needs to meet the requirements of winding on the drum 5, the side pressure piece 9 must meet the requirements of winding, and the wire mesh can meet this requirement. The end pressure plate 10 adopts the stacking plate 23, which includes three stacking plates. The end of the leaf cloth 6 is rolled on the middle stacking plate, and then the three stacking plates are stacked and fixed with multiple bolts to achieve the edge sealing of the leaf cloth end. One end of the leaf cloth 6 wrapped around the drum 5 is completely fixed to it.

[0031] The reinforcing grid 7 is located on the leeward side of the leaf cloth 6, and the reinforcing grid 7 only supports the leaf cloth 6 on the leeward side, or the reinforcing grid 7 includes two reinforcing grids 7, which are respectively located on the upper and lower sides of the leaf cloth 6, and the two reinforcing grids 7 support the leaf cloth 6 on the leeward side and the windward side, which has a better effect than single-sided support. The leaf cloth 6 is glass cloth.

[0032] When the blade 1 is mounted on the hub of the wind turbine 15, the blade 1 is tilted at a certain angle as a whole, and three blades 1 are arranged on the hub at equal intervals.

[0033] The above are only preferred embodiments of the present invention.

Claims

1. A wind turbine blade with variable area, characterized in that, The blade (1) comprises an arm (2), an outer frame (3) and two blade wing assemblies (4) symmetrically arranged in the outer frame (3); one end of the arm (2) is fixedly connected to the outer frame (3); the blade wing assembly (4) comprises a rotating drum (5), a blade cloth (6) and a reinforcing grid (7); the rotating drum (5) is connected to the middle position of the outer frame (3) via a fixed shaft (8); the blade cloth (6) is wound around the rotating drum (5); side pressure sheets (9) are fixed to the edges of both sides of the blade cloth (6); and an end pressure plate (10) is fixedly arranged at the end of the blade cloth (6). The outer frame (3) is provided with guide grooves (11) on both sides of the inner connection, the side pressure plates (9) are located in the guide grooves (11) at corresponding positions and are slidably connected thereto, the reinforcing grid (7) is fixedly connected to the outer frame (3), the end pressure plate (10) is connected to a pull rope (12), the pull rope (12) is wound around a reel (13), a wheel shaft (14) is coaxially fixedly provided in the middle of the reel (13), both ends of the wheel shaft (14) are connected to the outer frame (3) via a bearing seat, and the wheel shaft (14) and the rotating drum (5) are both connected to a driving device.

2. The variable-area wind turbine blade according to claim 1, wherein The driving device comprises a motor (15), a main gear (16), a transition gear (17), a cylinder gear (18) and two chain transmission assemblies (19); a base (20) is arranged on the outer frame (3); a housing of the motor (15) is fixed to the base (20); a main gear (16) is coaxially fixedly arranged on an output shaft of the motor (15); the cylinder gear (18) comprises two cylinder gears (18), the two cylinder gears (18) are respectively mounted on rotating cylinders (5) corresponding to the two blade assemblies (4); the main gear (16) meshes with one of the cylinder gears (18) A transition gear (17) is arranged between the main gear (16) and the other cylindrical gear (18) and is transmission-connected thereto; a bearing seat is arranged on the machine base (20); the transition gear (17) is rotationally connected to the bearing seat via a rotating shaft (21); the output shaft of the motor (15) is connected to the wheel shaft (14) corresponding to one of the blade wing assemblies (4) via one of the chain transmission assemblies (19); and the rotating shaft (21) is connected to the wheel shaft (14) corresponding to the other blade wing assembly (4) via another chain transmission assembly (19).

3. The variable-area wind turbine blade according to claim 1, wherein The guide groove (11) is a "T"-shaped groove structure, and the portion of the side pressure piece (9) located inside the guide groove (11) matches its structure.

4. The variable-area wind turbine blade according to claim 1, characterized in that, The reinforcing grid (7) is located on the leeward side of the blade cloth (6), or the reinforcing grid (7) includes two reinforcing grids (7), which are respectively located on the upper and lower sides of the blade cloth (6).

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